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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /memory
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'memory')
-rw-r--r--memory/app.mozbuild27
-rw-r--r--memory/build/Makefile.in9
-rw-r--r--memory/build/Mutex.cpp25
-rw-r--r--memory/build/Mutex.h197
-rw-r--r--memory/build/Utils.h136
-rw-r--r--memory/build/fallback.cpp40
-rw-r--r--memory/build/malloc_decls.h153
-rw-r--r--memory/build/moz.build63
-rw-r--r--memory/build/mozjemalloc.cpp5311
-rw-r--r--memory/build/mozjemalloc.h79
-rw-r--r--memory/build/mozjemalloc_types.h193
-rw-r--r--memory/build/mozmemory.h79
-rw-r--r--memory/build/mozmemory_utils.h75
-rw-r--r--memory/build/mozmemory_wrap.cpp145
-rw-r--r--memory/build/mozmemory_wrap.h166
-rw-r--r--memory/build/rb.h741
-rw-r--r--memory/build/replace_malloc.h113
-rw-r--r--memory/build/replace_malloc_bridge.h277
-rw-r--r--memory/build/test/TestMozJemallocUtils.cpp152
-rw-r--r--memory/build/test/moz.build17
-rw-r--r--memory/build/zone.c377
-rw-r--r--memory/gtest/TestJemalloc.cpp756
-rw-r--r--memory/gtest/moz.build22
-rw-r--r--memory/moz.build31
-rw-r--r--memory/moz.configure7
-rw-r--r--memory/mozalloc/cxxalloc.cpp26
-rw-r--r--memory/mozalloc/cxxalloc.h82
-rw-r--r--memory/mozalloc/moz.build59
-rw-r--r--memory/mozalloc/mozalloc.cpp159
-rw-r--r--memory/mozalloc/mozalloc.h198
-rw-r--r--memory/mozalloc/mozalloc_abort.cpp96
-rw-r--r--memory/mozalloc/mozalloc_abort.h28
-rw-r--r--memory/mozalloc/mozalloc_oom.cpp52
-rw-r--r--memory/mozalloc/mozalloc_oom.h29
-rw-r--r--memory/mozalloc/msvc_raise_wrappers.cpp17
-rw-r--r--memory/mozalloc/throw_gcc.h152
-rw-r--r--memory/mozalloc/winheap.cpp55
-rw-r--r--memory/mozjemalloc_info/MozjemallocInfo.cpp46
-rw-r--r--memory/mozjemalloc_info/moz.build39
-rw-r--r--memory/replace/dmd/DMD.cpp1888
-rw-r--r--memory/replace/dmd/DMD.h291
-rw-r--r--memory/replace/dmd/README3
-rw-r--r--memory/replace/dmd/block_analyzer.py292
-rwxr-xr-xmemory/replace/dmd/dmd.py1027
-rw-r--r--memory/replace/dmd/moz.build37
-rw-r--r--memory/replace/dmd/test/SmokeDMD.cpp378
-rw-r--r--memory/replace/dmd/test/basic-scan-32-expected.txt25
-rw-r--r--memory/replace/dmd/test/basic-scan-64-expected.txt25
-rw-r--r--memory/replace/dmd/test/complete-empty-cumulative-expected.txt18
-rw-r--r--memory/replace/dmd/test/complete-empty-dark-matter-expected.txt29
-rw-r--r--memory/replace/dmd/test/complete-empty-live-expected.txt18
-rw-r--r--memory/replace/dmd/test/complete-full1-dark-matter-expected.txt265
-rw-r--r--memory/replace/dmd/test/complete-full1-live-expected.txt127
-rw-r--r--memory/replace/dmd/test/complete-full2-cumulative-expected.txt173
-rw-r--r--memory/replace/dmd/test/complete-full2-dark-matter-expected.txt140
-rw-r--r--memory/replace/dmd/test/complete-partial-live-expected.txt56
-rw-r--r--memory/replace/dmd/test/moz.build26
-rw-r--r--memory/replace/dmd/test/scan-test.py102
-rw-r--r--memory/replace/dmd/test/script-diff-dark-matter-expected.txt127
-rw-r--r--memory/replace/dmd/test/script-diff-dark-matter1.json51
-rw-r--r--memory/replace/dmd/test/script-diff-dark-matter2.json51
-rw-r--r--memory/replace/dmd/test/script-diff-live-expected.txt81
-rw-r--r--memory/replace/dmd/test/script-diff-live1.json51
-rw-r--r--memory/replace/dmd/test/script-diff-live2.json53
-rw-r--r--memory/replace/dmd/test/script-ignore-alloc-fns-expected.txt72
-rw-r--r--memory/replace/dmd/test/script-ignore-alloc-fns.json45
-rw-r--r--memory/replace/dmd/test/script-max-frames-1-expected.txt26
-rw-r--r--memory/replace/dmd/test/script-max-frames-3-expected.txt48
-rw-r--r--memory/replace/dmd/test/script-max-frames-8-expected.txt69
-rw-r--r--memory/replace/dmd/test/script-max-frames.json43
-rw-r--r--memory/replace/dmd/test/script-sort-by-num-blocks-expected.txt46
-rw-r--r--memory/replace/dmd/test/script-sort-by-req-expected.txt46
-rw-r--r--memory/replace/dmd/test/script-sort-by-slop-expected.txt46
-rw-r--r--memory/replace/dmd/test/script-sort-by-usable-expected.txt46
-rw-r--r--memory/replace/dmd/test/script-sort-by.json.gzbin0 -> 272 bytes
-rw-r--r--memory/replace/dmd/test/test_dmd.js224
-rw-r--r--memory/replace/dmd/test/xpcshell.ini35
-rw-r--r--memory/replace/logalloc/FdPrintf.cpp200
-rw-r--r--memory/replace/logalloc/FdPrintf.h27
-rw-r--r--memory/replace/logalloc/LogAlloc.cpp238
-rw-r--r--memory/replace/logalloc/README95
-rw-r--r--memory/replace/logalloc/moz.build30
-rw-r--r--memory/replace/logalloc/replay/Makefile.in48
-rw-r--r--memory/replace/logalloc/replay/Replay.cpp1159
-rw-r--r--memory/replace/logalloc/replay/expected_output_minimal.log17
-rw-r--r--memory/replace/logalloc/replay/logalloc_munge.py147
-rw-r--r--memory/replace/logalloc/replay/moz.build92
-rw-r--r--memory/replace/logalloc/replay/replay.log18
-rw-r--r--memory/replace/moz.build25
-rw-r--r--memory/replace/phc/PHC.cpp1698
-rw-r--r--memory/replace/phc/PHC.h102
-rw-r--r--memory/replace/phc/moz.build50
-rw-r--r--memory/replace/phc/test/gtest/TestPHC.cpp305
-rw-r--r--memory/replace/phc/test/gtest/moz.build15
-rw-r--r--memory/replace/phc/test/moz.build9
-rw-r--r--memory/volatile/VolatileBuffer.h161
-rw-r--r--memory/volatile/VolatileBufferAshmem.cpp120
-rw-r--r--memory/volatile/VolatileBufferFallback.cpp67
-rw-r--r--memory/volatile/VolatileBufferOSX.cpp105
-rw-r--r--memory/volatile/VolatileBufferWindows.cpp136
-rw-r--r--memory/volatile/moz.build31
-rw-r--r--memory/volatile/tests/TestVolatileBuffer.cpp100
-rw-r--r--memory/volatile/tests/moz.build11
103 files changed, 21315 insertions, 0 deletions
diff --git a/memory/app.mozbuild b/memory/app.mozbuild
new file mode 100644
index 0000000000..d4f9c357df
--- /dev/null
+++ b/memory/app.mozbuild
@@ -0,0 +1,27 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Indirectly necessary for chromium's lock.h, included from LogAlloc.cpp
+EXPORTS.mozilla += [
+ '/mozglue/misc/Printf.h',
+ '/xpcom/base/Logging.h',
+]
+
+DIRS += [
+ '/memory',
+ '/mfbt',
+]
+
+EXPORTS.mozilla += [
+ "/mozglue/misc/IntegerPrintfMacros.h",
+ "/mozglue/misc/Sprintf.h",
+]
+
+if CONFIG["OS_ARCH"] == "WINNT":
+ EXPORTS.mozilla += [
+ "/mozglue/misc/StackWalk_windows.h",
+ "/mozglue/misc/StackWalkThread.h",
+ ] \ No newline at end of file
diff --git a/memory/build/Makefile.in b/memory/build/Makefile.in
new file mode 100644
index 0000000000..c41ec8ea7d
--- /dev/null
+++ b/memory/build/Makefile.in
@@ -0,0 +1,9 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Workaround for alignment problems in gcov code. See
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1413570#c2.
+ifeq ($(CPU_ARCH),x86)
+PROFILE_GEN_CFLAGS += -mno-sse2
+endif
diff --git a/memory/build/Mutex.cpp b/memory/build/Mutex.cpp
new file mode 100644
index 0000000000..49f5d4e949
--- /dev/null
+++ b/memory/build/Mutex.cpp
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "Mutex.h"
+
+#if defined(XP_DARWIN)
+
+// static
+bool Mutex::SpinInKernelSpace() {
+# ifdef __aarch64__
+ return true;
+# else
+ if (__builtin_available(macOS 10.15, *)) {
+ return true;
+ }
+
+ return false;
+# endif
+}
+
+// static
+const bool Mutex::gSpinInKernelSpace = SpinInKernelSpace();
+
+#endif // defined(XP_DARWIN)
diff --git a/memory/build/Mutex.h b/memory/build/Mutex.h
new file mode 100644
index 0000000000..17ebadc0d1
--- /dev/null
+++ b/memory/build/Mutex.h
@@ -0,0 +1,197 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef Mutex_h
+#define Mutex_h
+
+#if defined(XP_WIN)
+# include <windows.h>
+#elif defined(XP_DARWIN)
+# include "mozilla/Assertions.h"
+# include <os/lock.h>
+#else
+# include <pthread.h>
+#endif
+#include "mozilla/Attributes.h"
+#include "mozilla/ThreadSafety.h"
+
+#if defined(XP_DARWIN)
+// For information about the following undocumented flags and functions see
+// https://github.com/apple/darwin-xnu/blob/main/bsd/sys/ulock.h and
+// https://github.com/apple/darwin-libplatform/blob/main/private/os/lock_private.h
+# define OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION (0x00010000)
+# define OS_UNFAIR_LOCK_ADAPTIVE_SPIN (0x00040000)
+
+extern "C" {
+
+typedef uint32_t os_unfair_lock_options_t;
+OS_UNFAIR_LOCK_AVAILABILITY
+OS_EXPORT OS_NOTHROW OS_NONNULL_ALL void os_unfair_lock_lock_with_options(
+ os_unfair_lock_t lock, os_unfair_lock_options_t options);
+}
+#endif // defined(XP_DARWIN)
+
+// Mutexes based on spinlocks. We can't use normal pthread spinlocks in all
+// places, because they require malloc()ed memory, which causes bootstrapping
+// issues in some cases. We also can't use constructors, because for statics,
+// they would fire after the first use of malloc, resetting the locks.
+struct MOZ_CAPABILITY("mutex") Mutex {
+#if defined(XP_WIN)
+ CRITICAL_SECTION mMutex;
+#elif defined(XP_DARWIN)
+ os_unfair_lock mMutex;
+#else
+ pthread_mutex_t mMutex;
+#endif
+
+ // Initializes a mutex. Returns whether initialization succeeded.
+ inline bool Init() {
+#if defined(XP_WIN)
+ if (!InitializeCriticalSectionAndSpinCount(&mMutex, 5000)) {
+ return false;
+ }
+#elif defined(XP_DARWIN)
+ mMutex = OS_UNFAIR_LOCK_INIT;
+#elif defined(XP_LINUX) && !defined(ANDROID)
+ pthread_mutexattr_t attr;
+ if (pthread_mutexattr_init(&attr) != 0) {
+ return false;
+ }
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
+ if (pthread_mutex_init(&mMutex, &attr) != 0) {
+ pthread_mutexattr_destroy(&attr);
+ return false;
+ }
+ pthread_mutexattr_destroy(&attr);
+#else
+ if (pthread_mutex_init(&mMutex, nullptr) != 0) {
+ return false;
+ }
+#endif
+ return true;
+ }
+
+ inline void Lock() MOZ_CAPABILITY_ACQUIRE() {
+#if defined(XP_WIN)
+ EnterCriticalSection(&mMutex);
+#elif defined(XP_DARWIN)
+ // We rely on a non-public function to improve performance here.
+ // The OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION flag informs the kernel that
+ // the calling thread is able to make progress even in absence of actions
+ // from other threads and the OS_UNFAIR_LOCK_ADAPTIVE_SPIN one causes the
+ // kernel to spin on a contested lock if the owning thread is running on
+ // the same physical core (presumably only on x86 CPUs given that ARM
+ // macs don't have cores capable of SMT). On versions of macOS older than
+ // 10.15 the latter is not available and we spin in userspace instead.
+ if (Mutex::gSpinInKernelSpace) {
+ os_unfair_lock_lock_with_options(
+ &mMutex,
+ OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION | OS_UNFAIR_LOCK_ADAPTIVE_SPIN);
+ } else {
+# if defined(__x86_64__)
+ // On older versions of macOS (10.14 and older) the
+ // `OS_UNFAIR_LOCK_ADAPTIVE_SPIN` flag is not supported by the kernel,
+ // we spin in user-space instead like `OSSpinLock` does:
+ // https://github.com/apple/darwin-libplatform/blob/215b09856ab5765b7462a91be7076183076600df/src/os/lock.c#L183-L198
+ // Note that `OSSpinLock` uses 1000 iterations on x86-64:
+ // https://github.com/apple/darwin-libplatform/blob/215b09856ab5765b7462a91be7076183076600df/src/os/lock.c#L93
+ // ...but we only use 100 like it does on ARM:
+ // https://github.com/apple/darwin-libplatform/blob/215b09856ab5765b7462a91be7076183076600df/src/os/lock.c#L90
+ // We choose this value because it yields the same results in our
+ // benchmarks but is less likely to have detrimental effects caused by
+ // excessive spinning.
+ uint32_t retries = 100;
+
+ do {
+ if (os_unfair_lock_trylock(&mMutex)) {
+ return;
+ }
+
+ __asm__ __volatile__("pause");
+ } while (retries--);
+
+ os_unfair_lock_lock_with_options(&mMutex,
+ OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION);
+# else
+ MOZ_CRASH("User-space spin-locks should never be used on ARM");
+# endif // defined(__x86_64__)
+ }
+#else
+ pthread_mutex_lock(&mMutex);
+#endif
+ }
+
+ inline void Unlock() MOZ_CAPABILITY_RELEASE() {
+#if defined(XP_WIN)
+ LeaveCriticalSection(&mMutex);
+#elif defined(XP_DARWIN)
+ os_unfair_lock_unlock(&mMutex);
+#else
+ pthread_mutex_unlock(&mMutex);
+#endif
+ }
+
+#if defined(XP_DARWIN)
+ static bool SpinInKernelSpace();
+ static const bool gSpinInKernelSpace;
+#endif // XP_DARWIN
+};
+
+// Mutex that can be used for static initialization.
+// On Windows, CRITICAL_SECTION requires a function call to be initialized,
+// but for the initialization lock, a static initializer calling the
+// function would be called too late. We need no-function-call
+// initialization, which SRWLock provides.
+// Ideally, we'd use the same type of locks everywhere, but SRWLocks
+// everywhere incur a performance penalty. See bug 1418389.
+#if defined(XP_WIN)
+struct MOZ_CAPABILITY("mutex") StaticMutex {
+ SRWLOCK mMutex;
+
+ inline void Lock() MOZ_CAPABILITY_ACQUIRE() {
+ AcquireSRWLockExclusive(&mMutex);
+ }
+
+ inline void Unlock() MOZ_CAPABILITY_RELEASE() {
+ ReleaseSRWLockExclusive(&mMutex);
+ }
+};
+
+// Normally, we'd use a constexpr constructor, but MSVC likes to create
+// static initializers anyways.
+# define STATIC_MUTEX_INIT SRWLOCK_INIT
+
+#else
+typedef Mutex StaticMutex;
+
+# if defined(XP_DARWIN)
+# define STATIC_MUTEX_INIT OS_UNFAIR_LOCK_INIT
+# elif defined(XP_LINUX) && !defined(ANDROID)
+# define STATIC_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
+# else
+# define STATIC_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
+# endif
+
+#endif
+
+template <typename T>
+struct MOZ_SCOPED_CAPABILITY MOZ_RAII AutoLock {
+ explicit AutoLock(T& aMutex) MOZ_CAPABILITY_ACQUIRE(aMutex) : mMutex(aMutex) {
+ mMutex.Lock();
+ }
+
+ ~AutoLock() MOZ_CAPABILITY_RELEASE() { mMutex.Unlock(); }
+
+ AutoLock(const AutoLock&) = delete;
+ AutoLock(AutoLock&&) = delete;
+
+ private:
+ T& mMutex;
+};
+
+using MutexAutoLock = AutoLock<Mutex>;
+
+#endif
diff --git a/memory/build/Utils.h b/memory/build/Utils.h
new file mode 100644
index 0000000000..6032bf23d0
--- /dev/null
+++ b/memory/build/Utils.h
@@ -0,0 +1,136 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef Utils_h
+#define Utils_h
+
+#include <type_traits>
+
+#include "mozilla/CheckedInt.h"
+#include "mozilla/TemplateLib.h"
+
+// Helper for log2 of powers of 2 at compile time.
+template <size_t N>
+struct Log2 : mozilla::tl::CeilingLog2<N> {
+ using mozilla::tl::CeilingLog2<N>::value;
+ static_assert(1ULL << value == N, "Number is not a power of 2");
+};
+#define LOG2(N) Log2<N>::value
+
+enum class Order {
+ eLess = -1,
+ eEqual = 0,
+ eGreater = 1,
+};
+
+// Compare two integers. Returns whether the first integer is Less,
+// Equal or Greater than the second integer.
+template <typename T>
+Order CompareInt(T aValue1, T aValue2) {
+ static_assert(std::is_integral_v<T>, "Type must be integral");
+ if (aValue1 < aValue2) {
+ return Order::eLess;
+ }
+ if (aValue1 > aValue2) {
+ return Order::eGreater;
+ }
+ return Order::eEqual;
+}
+
+// Compare two addresses. Returns whether the first address is Less,
+// Equal or Greater than the second address.
+template <typename T>
+Order CompareAddr(T* aAddr1, T* aAddr2) {
+ return CompareInt(uintptr_t(aAddr1), uintptr_t(aAddr2));
+}
+
+// User-defined literals to make constants more legible
+constexpr size_t operator"" _KiB(unsigned long long int aNum) {
+ return size_t(aNum) * 1024;
+}
+
+constexpr size_t operator"" _KiB(long double aNum) {
+ return size_t(aNum * 1024);
+}
+
+constexpr size_t operator"" _MiB(unsigned long long int aNum) {
+ return size_t(aNum) * 1024_KiB;
+}
+
+constexpr size_t operator"" _MiB(long double aNum) {
+ return size_t(aNum * 1024_KiB);
+}
+
+constexpr double operator""_percent(long double aPercent) {
+ return double(aPercent) / 100;
+}
+
+// Helper for (fast) comparison of fractions without involving divisions or
+// floats.
+class Fraction {
+ public:
+ explicit constexpr Fraction(size_t aNumerator, size_t aDenominator)
+ : mNumerator(aNumerator), mDenominator(aDenominator) {}
+
+ MOZ_IMPLICIT constexpr Fraction(long double aValue)
+ // We use an arbitrary power of two as denominator that provides enough
+ // precision for our use case.
+ : mNumerator(aValue * 4096), mDenominator(4096) {}
+
+ inline bool operator<(const Fraction& aOther) const {
+#ifndef MOZ_DEBUG
+ // We are comparing A / B < C / D, with all A, B, C and D being positive
+ // numbers. Multiplying both sides with B * D, we have:
+ // (A * B * D) / B < (C * B * D) / D, which can then be simplified as
+ // A * D < C * B. When can thus compare our fractions without actually
+ // doing any division.
+ // This however assumes the multiplied quantities are small enough not
+ // to overflow the multiplication. We use CheckedInt on debug builds
+ // to enforce the assumption.
+ return mNumerator * aOther.mDenominator < aOther.mNumerator * mDenominator;
+#else
+ mozilla::CheckedInt<size_t> numerator(mNumerator);
+ mozilla::CheckedInt<size_t> denominator(mDenominator);
+ // value() asserts when the multiplication overflowed.
+ size_t lhs = (numerator * aOther.mDenominator).value();
+ size_t rhs = (aOther.mNumerator * denominator).value();
+ return lhs < rhs;
+#endif
+ }
+
+ inline bool operator>(const Fraction& aOther) const { return aOther < *this; }
+
+ inline bool operator>=(const Fraction& aOther) const {
+ return !(*this < aOther);
+ }
+
+ inline bool operator<=(const Fraction& aOther) const {
+ return !(*this > aOther);
+ }
+
+ inline bool operator==(const Fraction& aOther) const {
+#ifndef MOZ_DEBUG
+ // Same logic as operator<
+ return mNumerator * aOther.mDenominator == aOther.mNumerator * mDenominator;
+#else
+ mozilla::CheckedInt<size_t> numerator(mNumerator);
+ mozilla::CheckedInt<size_t> denominator(mDenominator);
+ size_t lhs = (numerator * aOther.mDenominator).value();
+ size_t rhs = (aOther.mNumerator * denominator).value();
+ return lhs == rhs;
+#endif
+ }
+
+ inline bool operator!=(const Fraction& aOther) const {
+ return !(*this == aOther);
+ }
+
+ private:
+ size_t mNumerator;
+ size_t mDenominator;
+};
+
+#endif
diff --git a/memory/build/fallback.cpp b/memory/build/fallback.cpp
new file mode 100644
index 0000000000..6f1791bed9
--- /dev/null
+++ b/memory/build/fallback.cpp
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozmemory.h"
+#include "mozjemalloc.h"
+#include <stdlib.h>
+
+#ifndef HAVE_MEMALIGN
+MOZ_MEMORY_API void* memalign(size_t aAlignment, size_t aSize) {
+# ifdef XP_WIN
+ return _aligned_malloc(aSize, aAlignment);
+# else
+ void* ret;
+ if (posix_memalign(&ret, aAlignment, aSize) != 0) {
+ return nullptr;
+ }
+ return ret;
+# endif
+}
+#endif
+
+struct SystemMalloc {
+#define MALLOC_DECL(name, return_type, ...) \
+ static inline return_type name(ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) { \
+ return ::name(ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
+ }
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
+#include "malloc_decls.h"
+};
+
+#define MALLOC_DECL(name, return_type, ...) \
+ MOZ_JEMALLOC_API return_type name(ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) { \
+ return DummyArenaAllocator<SystemMalloc>::name( \
+ ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
+ }
+#define MALLOC_FUNCS MALLOC_FUNCS_ARENA
+#include "malloc_decls.h"
diff --git a/memory/build/malloc_decls.h b/memory/build/malloc_decls.h
new file mode 100644
index 0000000000..1b4a061357
--- /dev/null
+++ b/memory/build/malloc_decls.h
@@ -0,0 +1,153 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Helper header to declare all the supported malloc functions.
+// MALLOC_DECL arguments are:
+// - function name
+// - return type
+// - argument types
+
+#ifndef malloc_decls_h
+# define malloc_decls_h
+
+# include "mozjemalloc_types.h"
+
+# define MALLOC_FUNCS_MALLOC_BASE 1
+# define MALLOC_FUNCS_MALLOC_EXTRA 2
+# define MALLOC_FUNCS_MALLOC \
+ (MALLOC_FUNCS_MALLOC_BASE | MALLOC_FUNCS_MALLOC_EXTRA)
+# define MALLOC_FUNCS_JEMALLOC 4
+# define MALLOC_FUNCS_ARENA_BASE 8
+# define MALLOC_FUNCS_ARENA_ALLOC 16
+# define MALLOC_FUNCS_ARENA \
+ (MALLOC_FUNCS_ARENA_BASE | MALLOC_FUNCS_ARENA_ALLOC)
+# define MALLOC_FUNCS_ALL \
+ (MALLOC_FUNCS_MALLOC | MALLOC_FUNCS_JEMALLOC | MALLOC_FUNCS_ARENA)
+
+#endif // malloc_decls_h
+
+#ifndef MALLOC_FUNCS
+# define MALLOC_FUNCS MALLOC_FUNCS_ALL
+#endif
+
+#ifdef MALLOC_DECL
+// NOTHROW_MALLOC_DECL is intended for functions where the standard library
+// declares the functions in question as `throw()`. Not all platforms
+// consistent declare certain functions as `throw()`, though.
+
+// Bionic and OS X don't seem to care about `throw()`ness.
+# if defined(ANDROID) || defined(XP_DARWIN)
+# undef NOTHROW_MALLOC_DECL
+# define NOTHROW_MALLOC_DECL MALLOC_DECL
+// Some places don't care about the distinction.
+# elif !defined(NOTHROW_MALLOC_DECL)
+# define NOTHROW_MALLOC_DECL MALLOC_DECL
+# endif
+
+# if MALLOC_FUNCS & MALLOC_FUNCS_MALLOC_BASE
+MALLOC_DECL(malloc, void*, size_t)
+MALLOC_DECL(calloc, void*, size_t, size_t)
+MALLOC_DECL(realloc, void*, void*, size_t)
+NOTHROW_MALLOC_DECL(free, void, void*)
+NOTHROW_MALLOC_DECL(memalign, void*, size_t, size_t)
+# endif
+# if MALLOC_FUNCS & MALLOC_FUNCS_MALLOC_EXTRA
+NOTHROW_MALLOC_DECL(posix_memalign, int, void**, size_t, size_t)
+NOTHROW_MALLOC_DECL(aligned_alloc, void*, size_t, size_t)
+NOTHROW_MALLOC_DECL(valloc, void*, size_t)
+NOTHROW_MALLOC_DECL(malloc_usable_size, size_t, usable_ptr_t)
+MALLOC_DECL(malloc_good_size, size_t, size_t)
+# endif
+
+# if MALLOC_FUNCS & MALLOC_FUNCS_JEMALLOC
+// The 2nd argument points to an optional array exactly
+// jemalloc_stats_num_bins() long to be filled in (if non-null).
+MALLOC_DECL(jemalloc_stats_internal, void, jemalloc_stats_t*,
+ jemalloc_bin_stats_t*)
+
+// Return the size of the jemalloc_bin_stats_t array.
+MALLOC_DECL(jemalloc_stats_num_bins, size_t)
+
+// On some operating systems (Mac), we use madvise(MADV_FREE) to hand pages
+// back to the operating system. On Mac, the operating system doesn't take
+// this memory back immediately; instead, the OS takes it back only when the
+// machine is running out of physical memory.
+//
+// This is great from the standpoint of efficiency, but it makes measuring our
+// actual RSS difficult, because pages which we've MADV_FREE'd shouldn't count
+// against our RSS.
+//
+// This function explicitly purges any MADV_FREE'd pages from physical memory,
+// causing our reported RSS match the amount of memory we're actually using.
+//
+// Note that this call is expensive in two ways. First, it may be slow to
+// execute, because it may make a number of slow syscalls to free memory. This
+// function holds the big jemalloc locks, so basically all threads are blocked
+// while this function runs.
+//
+// This function is also expensive in that the next time we go to access a page
+// which we've just explicitly decommitted, the operating system has to attach
+// to it a physical page! If we hadn't run this function, the OS would have
+// less work to do.
+//
+// If MALLOC_DOUBLE_PURGE is not defined, this function does nothing.
+MALLOC_DECL(jemalloc_purge_freed_pages, void)
+
+// Free all unused dirty pages in all arenas. Calling this function will slow
+// down subsequent allocations so it is recommended to use it only when
+// memory needs to be reclaimed at all costs (see bug 805855). This function
+// provides functionality similar to mallctl("arenas.purge") in jemalloc 3.
+MALLOC_DECL(jemalloc_free_dirty_pages, void)
+
+// Opt in or out of a thread local arena (bool argument is whether to opt-in
+// (true) or out (false)).
+MALLOC_DECL(jemalloc_thread_local_arena, void, bool)
+
+// Provide information about any allocation enclosing the given address.
+MALLOC_DECL(jemalloc_ptr_info, void, const void*, jemalloc_ptr_info_t*)
+# endif
+
+# if MALLOC_FUNCS & MALLOC_FUNCS_ARENA_BASE
+
+// Creates a separate arena, and returns its id, valid to use with moz_arena_*
+// functions. A helper is provided in mozmemory.h that doesn't take any
+// arena_params_t: moz_create_arena.
+MALLOC_DECL(moz_create_arena_with_params, arena_id_t, arena_params_t*)
+
+// Dispose of the given arena. Subsequent uses of the arena will crash.
+// Passing an invalid id (inexistent or already disposed) to this function
+// will crash. The arena must be empty prior to calling this function.
+MALLOC_DECL(moz_dispose_arena, void, arena_id_t)
+
+// Set the default modifier for mMaxDirty. The value is the number of shifts
+// applied to the value. Positive value is handled as <<, negative >>.
+// Arenas may override the default modifier.
+MALLOC_DECL(moz_set_max_dirty_page_modifier, void, int32_t)
+
+# endif
+
+# if MALLOC_FUNCS & MALLOC_FUNCS_ARENA_ALLOC
+// Same as the functions without the moz_arena_ prefix, but using arenas
+// created with moz_create_arena.
+// The contract, even if not enforced at runtime in some configurations,
+// is that moz_arena_realloc and moz_arena_free will crash if the given
+// arena doesn't own the given pointer. All functions will crash if the
+// arena id is invalid.
+// Although discouraged, plain realloc and free can still be used on
+// pointers allocated with these functions. Realloc will properly keep
+// new pointers in the same arena as the original.
+MALLOC_DECL(moz_arena_malloc, void*, arena_id_t, size_t)
+MALLOC_DECL(moz_arena_calloc, void*, arena_id_t, size_t, size_t)
+MALLOC_DECL(moz_arena_realloc, void*, arena_id_t, void*, size_t)
+MALLOC_DECL(moz_arena_free, void, arena_id_t, void*)
+MALLOC_DECL(moz_arena_memalign, void*, arena_id_t, size_t, size_t)
+# endif
+
+#endif // MALLOC_DECL
+
+#undef NOTHROW_MALLOC_DECL
+#undef MALLOC_DECL
+#undef MALLOC_FUNCS
diff --git a/memory/build/moz.build b/memory/build/moz.build
new file mode 100644
index 0000000000..ef3bf0ccb0
--- /dev/null
+++ b/memory/build/moz.build
@@ -0,0 +1,63 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS += [
+ "malloc_decls.h",
+ "mozjemalloc_types.h",
+ "mozmemory.h",
+ "mozmemory_utils.h",
+ "mozmemory_wrap.h",
+]
+
+LIBRARY_DEFINES["MOZ_HAS_MOZGLUE"] = True
+DEFINES["MOZ_MEMORY_IMPL"] = True
+
+if CONFIG["MOZ_REPLACE_MALLOC"]:
+ EXPORTS += [
+ "replace_malloc.h",
+ "replace_malloc_bridge.h",
+ ]
+
+if CONFIG["MOZ_PHC"]:
+ DEFINES["MOZ_PHC"] = True
+
+if CONFIG["MOZ_MEMORY"]:
+ UNIFIED_SOURCES += [
+ "mozjemalloc.cpp",
+ "mozmemory_wrap.cpp",
+ ]
+else:
+ UNIFIED_SOURCES += [
+ "fallback.cpp",
+ ]
+
+if CONFIG["OS_TARGET"] == "Darwin" and (
+ CONFIG["MOZ_REPLACE_MALLOC"] or CONFIG["MOZ_MEMORY"]
+):
+ SOURCES += [
+ "Mutex.cpp",
+ "zone.c",
+ ]
+
+Library("memory")
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["CC_TYPE"] == "clang":
+ CXXFLAGS += [
+ "-Wno-tautological-pointer-compare",
+ ]
+
+if CONFIG["MOZ_BUILD_APP"] != "memory":
+ FINAL_LIBRARY = "mozglue"
+
+if CONFIG["MOZ_REPLACE_MALLOC_STATIC"]:
+ DEFINES["MOZ_REPLACE_MALLOC_STATIC"] = True
+
+DisableStlWrapping()
+
+if CONFIG["CC_TYPE"] == "clang-cl":
+ AllowCompilerWarnings() # workaround for bug 1090497
+
+TEST_DIRS += ["test"]
diff --git a/memory/build/mozjemalloc.cpp b/memory/build/mozjemalloc.cpp
new file mode 100644
index 0000000000..54aaac5598
--- /dev/null
+++ b/memory/build/mozjemalloc.cpp
@@ -0,0 +1,5311 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Portions of this file were originally under the following license:
+//
+// Copyright (C) 2006-2008 Jason Evans <jasone@FreeBSD.org>.
+// All rights reserved.
+// Copyright (C) 2007-2017 Mozilla Foundation.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+// notice(s), this list of conditions and the following disclaimer as
+// the first lines of this file unmodified other than the possible
+// addition of one or more copyright notices.
+// 2. Redistributions in binary form must reproduce the above copyright
+// notice(s), this list of conditions and the following disclaimer in
+// the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// *****************************************************************************
+//
+// This allocator implementation is designed to provide scalable performance
+// for multi-threaded programs on multi-processor systems. The following
+// features are included for this purpose:
+//
+// + Multiple arenas are used if there are multiple CPUs, which reduces lock
+// contention and cache sloshing.
+//
+// + Cache line sharing between arenas is avoided for internal data
+// structures.
+//
+// + Memory is managed in chunks and runs (chunks can be split into runs),
+// rather than as individual pages. This provides a constant-time
+// mechanism for associating allocations with particular arenas.
+//
+// Allocation requests are rounded up to the nearest size class, and no record
+// of the original request size is maintained. Allocations are broken into
+// categories according to size class. Assuming runtime defaults, the size
+// classes in each category are as follows (for x86, x86_64 and Apple Silicon):
+//
+// |=========================================================|
+// | Category | Subcategory | x86 | x86_64 | Mac ARM |
+// |---------------------------+---------+---------+---------|
+// | Word size | 32 bit | 64 bit | 64 bit |
+// | Page size | 4 Kb | 4 Kb | 16 Kb |
+// |=========================================================|
+// | Small | Tiny | 4/-w | -w | - |
+// | | | 8 | 8/-w | 8 |
+// | |----------------+---------|---------|---------|
+// | | Quantum-spaced | 16 | 16 | 16 |
+// | | | 32 | 32 | 32 |
+// | | | 48 | 48 | 48 |
+// | | | ... | ... | ... |
+// | | | 480 | 480 | 480 |
+// | | | 496 | 496 | 496 |
+// | |----------------+---------|---------|---------|
+// | | Quantum-wide- | 512 | 512 | 512 |
+// | | spaced | 768 | 768 | 768 |
+// | | | ... | ... | ... |
+// | | | 3584 | 3584 | 3584 |
+// | | | 3840 | 3840 | 3840 |
+// | |----------------+---------|---------|---------|
+// | | Sub-page | - | - | 4096 |
+// | | | - | - | 8 kB |
+// |=========================================================|
+// | Large | 4 kB | 4 kB | - |
+// | | 8 kB | 8 kB | - |
+// | | 12 kB | 12 kB | - |
+// | | 16 kB | 16 kB | 16 kB |
+// | | ... | ... | - |
+// | | 32 kB | 32 kB | 32 kB |
+// | | ... | ... | ... |
+// | | 1008 kB | 1008 kB | 1008 kB |
+// | | 1012 kB | 1012 kB | - |
+// | | 1016 kB | 1016 kB | - |
+// | | 1020 kB | 1020 kB | - |
+// |=========================================================|
+// | Huge | 1 MB | 1 MB | 1 MB |
+// | | 2 MB | 2 MB | 2 MB |
+// | | 3 MB | 3 MB | 3 MB |
+// | | ... | ... | ... |
+// |=========================================================|
+//
+// Legend:
+// n: Size class exists for this platform.
+// n/-w: This size class doesn't exist on Windows (see kMinTinyClass).
+// -: This size class doesn't exist for this platform.
+// ...: Size classes follow a pattern here.
+//
+// NOTE: Due to Mozilla bug 691003, we cannot reserve less than one word for an
+// allocation on Linux or Mac. So on 32-bit *nix, the smallest bucket size is
+// 4 bytes, and on 64-bit, the smallest bucket size is 8 bytes.
+//
+// A different mechanism is used for each category:
+//
+// Small : Each size class is segregated into its own set of runs. Each run
+// maintains a bitmap of which regions are free/allocated.
+//
+// Large : Each allocation is backed by a dedicated run. Metadata are stored
+// in the associated arena chunk header maps.
+//
+// Huge : Each allocation is backed by a dedicated contiguous set of chunks.
+// Metadata are stored in a separate red-black tree.
+//
+// *****************************************************************************
+
+#include "mozmemory_wrap.h"
+#include "mozjemalloc.h"
+#include "mozjemalloc_types.h"
+
+#include <cstring>
+#include <cerrno>
+#include <optional>
+#include <type_traits>
+#ifdef XP_WIN
+# include <io.h>
+# include <windows.h>
+#else
+# include <sys/mman.h>
+# include <unistd.h>
+#endif
+#ifdef XP_DARWIN
+# include <libkern/OSAtomic.h>
+# include <mach/mach_init.h>
+# include <mach/vm_map.h>
+#endif
+
+#include "mozilla/Atomics.h"
+#include "mozilla/Alignment.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/DoublyLinkedList.h"
+#include "mozilla/HelperMacros.h"
+#include "mozilla/Likely.h"
+#include "mozilla/MathAlgorithms.h"
+#include "mozilla/RandomNum.h"
+// Note: MozTaggedAnonymousMmap() could call an LD_PRELOADed mmap
+// instead of the one defined here; use only MozTagAnonymousMemory().
+#include "mozilla/TaggedAnonymousMemory.h"
+#include "mozilla/ThreadLocal.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/XorShift128PlusRNG.h"
+#include "mozilla/fallible.h"
+#include "rb.h"
+#include "Mutex.h"
+#include "Utils.h"
+
+#if defined(XP_WIN)
+# include "mozmemory_utils.h"
+#endif
+
+// For GetGeckoProcessType(), when it's used.
+#if defined(XP_WIN) && !defined(JS_STANDALONE)
+# include "mozilla/ProcessType.h"
+#endif
+
+using namespace mozilla;
+
+// On Linux, we use madvise(MADV_DONTNEED) to release memory back to the
+// operating system. If we release 1MB of live pages with MADV_DONTNEED, our
+// RSS will decrease by 1MB (almost) immediately.
+//
+// On Mac, we use madvise(MADV_FREE). Unlike MADV_DONTNEED on Linux, MADV_FREE
+// on Mac doesn't cause the OS to release the specified pages immediately; the
+// OS keeps them in our process until the machine comes under memory pressure.
+//
+// It's therefore difficult to measure the process's RSS on Mac, since, in the
+// absence of memory pressure, the contribution from the heap to RSS will not
+// decrease due to our madvise calls.
+//
+// We therefore define MALLOC_DOUBLE_PURGE on Mac. This causes jemalloc to
+// track which pages have been MADV_FREE'd. You can then call
+// jemalloc_purge_freed_pages(), which will force the OS to release those
+// MADV_FREE'd pages, making the process's RSS reflect its true memory usage.
+//
+// The jemalloc_purge_freed_pages definition in memory/build/mozmemory.h needs
+// to be adjusted if MALLOC_DOUBLE_PURGE is ever enabled on Linux.
+
+#ifdef XP_DARWIN
+# define MALLOC_DOUBLE_PURGE
+#endif
+
+#ifdef XP_WIN
+# define MALLOC_DECOMMIT
+#endif
+
+// Define MALLOC_RUNTIME_CONFIG depending on MOZ_DEBUG. Overriding this as
+// a build option allows us to build mozjemalloc/firefox without runtime asserts
+// but with runtime configuration. Making some testing easier.
+
+#ifdef MOZ_DEBUG
+# define MALLOC_RUNTIME_CONFIG
+#endif
+
+// When MALLOC_STATIC_PAGESIZE is defined, the page size is fixed at
+// compile-time for better performance, as opposed to determined at
+// runtime. Some platforms can have different page sizes at runtime
+// depending on kernel configuration, so they are opted out by default.
+// Debug builds are opted out too, for test coverage.
+#ifndef MALLOC_RUNTIME_CONFIG
+# if !defined(__ia64__) && !defined(__sparc__) && !defined(__mips__) && \
+ !defined(__aarch64__) && !defined(__powerpc__) && !defined(XP_MACOSX) && \
+ !defined(__loongarch__)
+# define MALLOC_STATIC_PAGESIZE 1
+# endif
+#endif
+
+#ifdef XP_WIN
+# define STDERR_FILENO 2
+
+// Implement getenv without using malloc.
+static char mozillaMallocOptionsBuf[64];
+
+# define getenv xgetenv
+static char* getenv(const char* name) {
+ if (GetEnvironmentVariableA(name, mozillaMallocOptionsBuf,
+ sizeof(mozillaMallocOptionsBuf)) > 0) {
+ return mozillaMallocOptionsBuf;
+ }
+
+ return nullptr;
+}
+#endif
+
+#ifndef XP_WIN
+// Newer Linux systems support MADV_FREE, but we're not supporting
+// that properly. bug #1406304.
+# if defined(XP_LINUX) && defined(MADV_FREE)
+# undef MADV_FREE
+# endif
+# ifndef MADV_FREE
+# define MADV_FREE MADV_DONTNEED
+# endif
+#endif
+
+// Some tools, such as /dev/dsp wrappers, LD_PRELOAD libraries that
+// happen to override mmap() and call dlsym() from their overridden
+// mmap(). The problem is that dlsym() calls malloc(), and this ends
+// up in a dead lock in jemalloc.
+// On these systems, we prefer to directly use the system call.
+// We do that for Linux systems and kfreebsd with GNU userland.
+// Note sanity checks are not done (alignment of offset, ...) because
+// the uses of mmap are pretty limited, in jemalloc.
+//
+// On Alpha, glibc has a bug that prevents syscall() to work for system
+// calls with 6 arguments.
+#if (defined(XP_LINUX) && !defined(__alpha__)) || \
+ (defined(__FreeBSD_kernel__) && defined(__GLIBC__))
+# include <sys/syscall.h>
+# if defined(SYS_mmap) || defined(SYS_mmap2)
+static inline void* _mmap(void* addr, size_t length, int prot, int flags,
+ int fd, off_t offset) {
+// S390 only passes one argument to the mmap system call, which is a
+// pointer to a structure containing the arguments.
+# ifdef __s390__
+ struct {
+ void* addr;
+ size_t length;
+ long prot;
+ long flags;
+ long fd;
+ off_t offset;
+ } args = {addr, length, prot, flags, fd, offset};
+ return (void*)syscall(SYS_mmap, &args);
+# else
+# if defined(ANDROID) && defined(__aarch64__) && defined(SYS_mmap2)
+// Android NDK defines SYS_mmap2 for AArch64 despite it not supporting mmap2.
+# undef SYS_mmap2
+# endif
+# ifdef SYS_mmap2
+ return (void*)syscall(SYS_mmap2, addr, length, prot, flags, fd, offset >> 12);
+# else
+ return (void*)syscall(SYS_mmap, addr, length, prot, flags, fd, offset);
+# endif
+# endif
+}
+# define mmap _mmap
+# define munmap(a, l) syscall(SYS_munmap, a, l)
+# endif
+#endif
+
+// ***************************************************************************
+// Structures for chunk headers for chunks used for non-huge allocations.
+
+struct arena_t;
+
+// Each element of the chunk map corresponds to one page within the chunk.
+struct arena_chunk_map_t {
+ // Linkage for run trees. There are two disjoint uses:
+ //
+ // 1) arena_t's tree or available runs.
+ // 2) arena_run_t conceptually uses this linkage for in-use non-full
+ // runs, rather than directly embedding linkage.
+ RedBlackTreeNode<arena_chunk_map_t> link;
+
+ // Run address (or size) and various flags are stored together. The bit
+ // layout looks like (assuming 32-bit system):
+ //
+ // ???????? ???????? ????---- -mckdzla
+ //
+ // ? : Unallocated: Run address for first/last pages, unset for internal
+ // pages.
+ // Small: Run address.
+ // Large: Run size for first page, unset for trailing pages.
+ // - : Unused.
+ // m : MADV_FREE/MADV_DONTNEED'ed?
+ // c : decommitted?
+ // k : key?
+ // d : dirty?
+ // z : zeroed?
+ // l : large?
+ // a : allocated?
+ //
+ // Following are example bit patterns for the three types of runs.
+ //
+ // r : run address
+ // s : run size
+ // x : don't care
+ // - : 0
+ // [cdzla] : bit set
+ //
+ // Unallocated:
+ // ssssssss ssssssss ssss---- --c-----
+ // xxxxxxxx xxxxxxxx xxxx---- ----d---
+ // ssssssss ssssssss ssss---- -----z--
+ //
+ // Small:
+ // rrrrrrrr rrrrrrrr rrrr---- -------a
+ // rrrrrrrr rrrrrrrr rrrr---- -------a
+ // rrrrrrrr rrrrrrrr rrrr---- -------a
+ //
+ // Large:
+ // ssssssss ssssssss ssss---- ------la
+ // -------- -------- -------- ------la
+ // -------- -------- -------- ------la
+ size_t bits;
+
+// Note that CHUNK_MAP_DECOMMITTED's meaning varies depending on whether
+// MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are defined.
+//
+// If MALLOC_DECOMMIT is defined, a page which is CHUNK_MAP_DECOMMITTED must be
+// re-committed with pages_commit() before it may be touched. If
+// MALLOC_DECOMMIT is defined, MALLOC_DOUBLE_PURGE may not be defined.
+//
+// If neither MALLOC_DECOMMIT nor MALLOC_DOUBLE_PURGE is defined, pages which
+// are madvised (with either MADV_DONTNEED or MADV_FREE) are marked with
+// CHUNK_MAP_MADVISED.
+//
+// Otherwise, if MALLOC_DECOMMIT is not defined and MALLOC_DOUBLE_PURGE is
+// defined, then a page which is madvised is marked as CHUNK_MAP_MADVISED.
+// When it's finally freed with jemalloc_purge_freed_pages, the page is marked
+// as CHUNK_MAP_DECOMMITTED.
+#define CHUNK_MAP_MADVISED ((size_t)0x40U)
+#define CHUNK_MAP_DECOMMITTED ((size_t)0x20U)
+#define CHUNK_MAP_MADVISED_OR_DECOMMITTED \
+ (CHUNK_MAP_MADVISED | CHUNK_MAP_DECOMMITTED)
+#define CHUNK_MAP_KEY ((size_t)0x10U)
+#define CHUNK_MAP_DIRTY ((size_t)0x08U)
+#define CHUNK_MAP_ZEROED ((size_t)0x04U)
+#define CHUNK_MAP_LARGE ((size_t)0x02U)
+#define CHUNK_MAP_ALLOCATED ((size_t)0x01U)
+};
+
+// Arena chunk header.
+struct arena_chunk_t {
+ // Arena that owns the chunk.
+ arena_t* arena;
+
+ // Linkage for the arena's tree of dirty chunks.
+ RedBlackTreeNode<arena_chunk_t> link_dirty;
+
+#ifdef MALLOC_DOUBLE_PURGE
+ // If we're double-purging, we maintain a linked list of chunks which
+ // have pages which have been madvise(MADV_FREE)'d but not explicitly
+ // purged.
+ //
+ // We're currently lazy and don't remove a chunk from this list when
+ // all its madvised pages are recommitted.
+ DoublyLinkedListElement<arena_chunk_t> chunks_madvised_elem;
+#endif
+
+ // Number of dirty pages.
+ size_t ndirty;
+
+ // Map of pages within chunk that keeps track of free/large/small.
+ arena_chunk_map_t map[1]; // Dynamically sized.
+};
+
+// ***************************************************************************
+// Constants defining allocator size classes and behavior.
+
+// Maximum size of L1 cache line. This is used to avoid cache line aliasing,
+// so over-estimates are okay (up to a point), but under-estimates will
+// negatively affect performance.
+static const size_t kCacheLineSize = 64;
+
+// Our size classes are inclusive ranges of memory sizes. By describing the
+// minimums and how memory is allocated in each range the maximums can be
+// calculated.
+
+// Smallest size class to support. On Windows the smallest allocation size
+// must be 8 bytes on 32-bit, 16 bytes on 64-bit. On Linux and Mac, even
+// malloc(1) must reserve a word's worth of memory (see Mozilla bug 691003).
+#ifdef XP_WIN
+static const size_t kMinTinyClass = sizeof(void*) * 2;
+#else
+static const size_t kMinTinyClass = sizeof(void*);
+#endif
+
+// Maximum tiny size class.
+static const size_t kMaxTinyClass = 8;
+
+// Smallest quantum-spaced size classes. It could actually also be labelled a
+// tiny allocation, and is spaced as such from the largest tiny size class.
+// Tiny classes being powers of 2, this is twice as large as the largest of
+// them.
+static const size_t kMinQuantumClass = kMaxTinyClass * 2;
+static const size_t kMinQuantumWideClass = 512;
+static const size_t kMinSubPageClass = 4_KiB;
+
+// Amount (quantum) separating quantum-spaced size classes.
+static const size_t kQuantum = 16;
+static const size_t kQuantumMask = kQuantum - 1;
+static const size_t kQuantumWide = 256;
+static const size_t kQuantumWideMask = kQuantumWide - 1;
+
+static const size_t kMaxQuantumClass = kMinQuantumWideClass - kQuantum;
+static const size_t kMaxQuantumWideClass = kMinSubPageClass - kQuantumWide;
+
+// We can optimise some divisions to shifts if these are powers of two.
+static_assert(mozilla::IsPowerOfTwo(kQuantum),
+ "kQuantum is not a power of two");
+static_assert(mozilla::IsPowerOfTwo(kQuantumWide),
+ "kQuantumWide is not a power of two");
+
+static_assert(kMaxQuantumClass % kQuantum == 0,
+ "kMaxQuantumClass is not a multiple of kQuantum");
+static_assert(kMaxQuantumWideClass % kQuantumWide == 0,
+ "kMaxQuantumWideClass is not a multiple of kQuantumWide");
+static_assert(kQuantum < kQuantumWide,
+ "kQuantum must be smaller than kQuantumWide");
+static_assert(mozilla::IsPowerOfTwo(kMinSubPageClass),
+ "kMinSubPageClass is not a power of two");
+
+// Number of (2^n)-spaced tiny classes.
+static const size_t kNumTinyClasses =
+ LOG2(kMaxTinyClass) - LOG2(kMinTinyClass) + 1;
+
+// Number of quantum-spaced classes. We add kQuantum(Max) before subtracting to
+// avoid underflow when a class is empty (Max<Min).
+static const size_t kNumQuantumClasses =
+ (kMaxQuantumClass + kQuantum - kMinQuantumClass) / kQuantum;
+static const size_t kNumQuantumWideClasses =
+ (kMaxQuantumWideClass + kQuantumWide - kMinQuantumWideClass) / kQuantumWide;
+
+// Size and alignment of memory chunks that are allocated by the OS's virtual
+// memory system.
+static const size_t kChunkSize = 1_MiB;
+static const size_t kChunkSizeMask = kChunkSize - 1;
+
+#ifdef MALLOC_STATIC_PAGESIZE
+// VM page size. It must divide the runtime CPU page size or the code
+// will abort.
+// Platform specific page size conditions copied from js/public/HeapAPI.h
+# if defined(__powerpc64__)
+static const size_t gPageSize = 64_KiB;
+# elif defined(__loongarch64)
+static const size_t gPageSize = 16_KiB;
+# else
+static const size_t gPageSize = 4_KiB;
+# endif
+static const size_t gRealPageSize = gPageSize;
+
+#else
+// When MALLOC_OPTIONS contains one or several `P`s, the page size used
+// across the allocator is multiplied by 2 for each `P`, but we also keep
+// the real page size for code paths that need it. gPageSize is thus a
+// power of two greater or equal to gRealPageSize.
+static size_t gRealPageSize;
+static size_t gPageSize;
+#endif
+
+#ifdef MALLOC_STATIC_PAGESIZE
+# define DECLARE_GLOBAL(type, name)
+# define DEFINE_GLOBALS
+# define END_GLOBALS
+# define DEFINE_GLOBAL(type) static const type
+# define GLOBAL_LOG2 LOG2
+# define GLOBAL_ASSERT_HELPER1(x) static_assert(x, #x)
+# define GLOBAL_ASSERT_HELPER2(x, y) static_assert(x, y)
+# define GLOBAL_ASSERT(...) \
+ MACRO_CALL( \
+ MOZ_PASTE_PREFIX_AND_ARG_COUNT(GLOBAL_ASSERT_HELPER, __VA_ARGS__), \
+ (__VA_ARGS__))
+# define GLOBAL_CONSTEXPR constexpr
+#else
+# define DECLARE_GLOBAL(type, name) static type name;
+# define DEFINE_GLOBALS static void DefineGlobals() {
+# define END_GLOBALS }
+# define DEFINE_GLOBAL(type)
+# define GLOBAL_LOG2 FloorLog2
+# define GLOBAL_ASSERT MOZ_RELEASE_ASSERT
+# define GLOBAL_CONSTEXPR
+#endif
+
+DECLARE_GLOBAL(size_t, gMaxSubPageClass)
+DECLARE_GLOBAL(uint8_t, gNumSubPageClasses)
+DECLARE_GLOBAL(uint8_t, gPageSize2Pow)
+DECLARE_GLOBAL(size_t, gPageSizeMask)
+DECLARE_GLOBAL(size_t, gChunkNumPages)
+DECLARE_GLOBAL(size_t, gChunkHeaderNumPages)
+DECLARE_GLOBAL(size_t, gMaxLargeClass)
+
+DEFINE_GLOBALS
+
+// Largest sub-page size class, or zero if there are none
+DEFINE_GLOBAL(size_t)
+gMaxSubPageClass = gPageSize / 2 >= kMinSubPageClass ? gPageSize / 2 : 0;
+
+// Max size class for bins.
+#define gMaxBinClass \
+ (gMaxSubPageClass ? gMaxSubPageClass : kMaxQuantumWideClass)
+
+// Number of sub-page bins.
+DEFINE_GLOBAL(uint8_t)
+gNumSubPageClasses = []() GLOBAL_CONSTEXPR -> uint8_t {
+ if GLOBAL_CONSTEXPR (gMaxSubPageClass != 0) {
+ return FloorLog2(gMaxSubPageClass) - LOG2(kMinSubPageClass) + 1;
+ }
+ return 0;
+}();
+
+DEFINE_GLOBAL(uint8_t) gPageSize2Pow = GLOBAL_LOG2(gPageSize);
+DEFINE_GLOBAL(size_t) gPageSizeMask = gPageSize - 1;
+
+// Number of pages in a chunk.
+DEFINE_GLOBAL(size_t) gChunkNumPages = kChunkSize >> gPageSize2Pow;
+
+// Number of pages necessary for a chunk header plus a guard page.
+DEFINE_GLOBAL(size_t)
+gChunkHeaderNumPages =
+ 1 + (((sizeof(arena_chunk_t) +
+ sizeof(arena_chunk_map_t) * (gChunkNumPages - 1) + gPageSizeMask) &
+ ~gPageSizeMask) >>
+ gPageSize2Pow);
+
+// One chunk, minus the header, minus a guard page
+DEFINE_GLOBAL(size_t)
+gMaxLargeClass =
+ kChunkSize - gPageSize - (gChunkHeaderNumPages << gPageSize2Pow);
+
+// Various sanity checks that regard configuration.
+GLOBAL_ASSERT(1ULL << gPageSize2Pow == gPageSize,
+ "Page size is not a power of two");
+GLOBAL_ASSERT(kQuantum >= sizeof(void*));
+GLOBAL_ASSERT(kQuantum <= kQuantumWide);
+GLOBAL_ASSERT(!kNumQuantumWideClasses ||
+ kQuantumWide <= (kMinSubPageClass - kMaxQuantumClass));
+
+GLOBAL_ASSERT(kQuantumWide <= kMaxQuantumClass);
+
+GLOBAL_ASSERT(gMaxSubPageClass >= kMinSubPageClass || gMaxSubPageClass == 0);
+GLOBAL_ASSERT(gMaxLargeClass >= gMaxSubPageClass);
+GLOBAL_ASSERT(kChunkSize >= gPageSize);
+GLOBAL_ASSERT(kQuantum * 4 <= kChunkSize);
+
+END_GLOBALS
+
+// Recycle at most 128 MiB of chunks. This means we retain at most
+// 6.25% of the process address space on a 32-bit OS for later use.
+static const size_t gRecycleLimit = 128_MiB;
+
+// The current amount of recycled bytes, updated atomically.
+static Atomic<size_t, ReleaseAcquire> gRecycledSize;
+
+// Maximum number of dirty pages per arena.
+#define DIRTY_MAX_DEFAULT (1U << 8)
+
+static size_t opt_dirty_max = DIRTY_MAX_DEFAULT;
+
+// Return the smallest chunk multiple that is >= s.
+#define CHUNK_CEILING(s) (((s) + kChunkSizeMask) & ~kChunkSizeMask)
+
+// Return the smallest cacheline multiple that is >= s.
+#define CACHELINE_CEILING(s) \
+ (((s) + (kCacheLineSize - 1)) & ~(kCacheLineSize - 1))
+
+// Return the smallest quantum multiple that is >= a.
+#define QUANTUM_CEILING(a) (((a) + (kQuantumMask)) & ~(kQuantumMask))
+#define QUANTUM_WIDE_CEILING(a) \
+ (((a) + (kQuantumWideMask)) & ~(kQuantumWideMask))
+
+// Return the smallest sub page-size that is >= a.
+#define SUBPAGE_CEILING(a) (RoundUpPow2(a))
+
+// Return the smallest pagesize multiple that is >= s.
+#define PAGE_CEILING(s) (((s) + gPageSizeMask) & ~gPageSizeMask)
+
+// Number of all the small-allocated classes
+#define NUM_SMALL_CLASSES \
+ (kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses + \
+ gNumSubPageClasses)
+
+// ***************************************************************************
+// MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive.
+#if defined(MALLOC_DECOMMIT) && defined(MALLOC_DOUBLE_PURGE)
+# error MALLOC_DECOMMIT and MALLOC_DOUBLE_PURGE are mutually exclusive.
+#endif
+
+static void* base_alloc(size_t aSize);
+
+// Set to true once the allocator has been initialized.
+#if defined(_MSC_VER) && !defined(__clang__)
+// MSVC may create a static initializer for an Atomic<bool>, which may actually
+// run after `malloc_init` has been called once, which triggers multiple
+// initializations.
+// We work around the problem by not using an Atomic<bool> at all. There is a
+// theoretical problem with using `malloc_initialized` non-atomically, but
+// practically, this is only true if `malloc_init` is never called before
+// threads are created.
+static bool malloc_initialized;
+#else
+static Atomic<bool, SequentiallyConsistent> malloc_initialized;
+#endif
+
+static StaticMutex gInitLock MOZ_UNANNOTATED = {STATIC_MUTEX_INIT};
+
+// ***************************************************************************
+// Statistics data structures.
+
+struct arena_stats_t {
+ // Number of bytes currently mapped.
+ size_t mapped;
+
+ // Current number of committed pages.
+ size_t committed;
+
+ // Per-size-category statistics.
+ size_t allocated_small;
+
+ size_t allocated_large;
+};
+
+// ***************************************************************************
+// Extent data structures.
+
+enum ChunkType {
+ UNKNOWN_CHUNK,
+ ZEROED_CHUNK, // chunk only contains zeroes.
+ ARENA_CHUNK, // used to back arena runs created by arena_t::AllocRun.
+ HUGE_CHUNK, // used to back huge allocations (e.g. arena_t::MallocHuge).
+ RECYCLED_CHUNK, // chunk has been stored for future use by chunk_recycle.
+};
+
+// Tree of extents.
+struct extent_node_t {
+ union {
+ // Linkage for the size/address-ordered tree for chunk recycling.
+ RedBlackTreeNode<extent_node_t> mLinkBySize;
+ // Arena id for huge allocations. It's meant to match mArena->mId,
+ // which only holds true when the arena hasn't been disposed of.
+ arena_id_t mArenaId;
+ };
+
+ // Linkage for the address-ordered tree.
+ RedBlackTreeNode<extent_node_t> mLinkByAddr;
+
+ // Pointer to the extent that this tree node is responsible for.
+ void* mAddr;
+
+ // Total region size.
+ size_t mSize;
+
+ union {
+ // What type of chunk is there; used for chunk recycling.
+ ChunkType mChunkType;
+
+ // A pointer to the associated arena, for huge allocations.
+ arena_t* mArena;
+ };
+};
+
+struct ExtentTreeSzTrait {
+ static RedBlackTreeNode<extent_node_t>& GetTreeNode(extent_node_t* aThis) {
+ return aThis->mLinkBySize;
+ }
+
+ static inline Order Compare(extent_node_t* aNode, extent_node_t* aOther) {
+ Order ret = CompareInt(aNode->mSize, aOther->mSize);
+ return (ret != Order::eEqual) ? ret
+ : CompareAddr(aNode->mAddr, aOther->mAddr);
+ }
+};
+
+struct ExtentTreeTrait {
+ static RedBlackTreeNode<extent_node_t>& GetTreeNode(extent_node_t* aThis) {
+ return aThis->mLinkByAddr;
+ }
+
+ static inline Order Compare(extent_node_t* aNode, extent_node_t* aOther) {
+ return CompareAddr(aNode->mAddr, aOther->mAddr);
+ }
+};
+
+struct ExtentTreeBoundsTrait : public ExtentTreeTrait {
+ static inline Order Compare(extent_node_t* aKey, extent_node_t* aNode) {
+ uintptr_t key_addr = reinterpret_cast<uintptr_t>(aKey->mAddr);
+ uintptr_t node_addr = reinterpret_cast<uintptr_t>(aNode->mAddr);
+ size_t node_size = aNode->mSize;
+
+ // Is aKey within aNode?
+ if (node_addr <= key_addr && key_addr < node_addr + node_size) {
+ return Order::eEqual;
+ }
+
+ return CompareAddr(aKey->mAddr, aNode->mAddr);
+ }
+};
+
+// Describe size classes to which allocations are rounded up to.
+// TODO: add large and huge types when the arena allocation code
+// changes in a way that allows it to be beneficial.
+class SizeClass {
+ public:
+ enum ClassType {
+ Tiny,
+ Quantum,
+ QuantumWide,
+ SubPage,
+ Large,
+ };
+
+ explicit inline SizeClass(size_t aSize) {
+ if (aSize <= kMaxTinyClass) {
+ mType = Tiny;
+ mSize = std::max(RoundUpPow2(aSize), kMinTinyClass);
+ } else if (aSize <= kMaxQuantumClass) {
+ mType = Quantum;
+ mSize = QUANTUM_CEILING(aSize);
+ } else if (aSize <= kMaxQuantumWideClass) {
+ mType = QuantumWide;
+ mSize = QUANTUM_WIDE_CEILING(aSize);
+ } else if (aSize <= gMaxSubPageClass) {
+ mType = SubPage;
+ mSize = SUBPAGE_CEILING(aSize);
+ } else if (aSize <= gMaxLargeClass) {
+ mType = Large;
+ mSize = PAGE_CEILING(aSize);
+ } else {
+ MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Invalid size");
+ }
+ }
+
+ SizeClass& operator=(const SizeClass& aOther) = default;
+
+ bool operator==(const SizeClass& aOther) { return aOther.mSize == mSize; }
+
+ size_t Size() { return mSize; }
+
+ ClassType Type() { return mType; }
+
+ SizeClass Next() { return SizeClass(mSize + 1); }
+
+ private:
+ ClassType mType;
+ size_t mSize;
+};
+
+// Fast division
+//
+// During deallocation we want to divide by the size class. This class
+// provides a routine and sets up a constant as follows.
+//
+// To divide by a number D that is not a power of two we multiply by (2^17 /
+// D) and then right shift by 17 positions.
+//
+// X / D
+//
+// becomes
+//
+// (X * m) >> p
+//
+// Where m is calculated during the FastDivisor constructor similarly to:
+//
+// m = 2^p / D
+//
+template <typename T>
+class FastDivisor {
+ private:
+ // The shift amount (p) is chosen to minimise the size of m while
+ // working for divisors up to 65536 in steps of 16. I arrived at 17
+ // experimentally. I wanted a low number to minimise the range of m
+ // so it can fit in a uint16_t, 16 didn't work but 17 worked perfectly.
+ //
+ // We'd need to increase this if we allocated memory on smaller boundaries
+ // than 16.
+ static const unsigned p = 17;
+
+ // We can fit the inverted divisor in 16 bits, but we template it here for
+ // convenience.
+ T m;
+
+ public:
+ // Needed so mBins can be constructed.
+ FastDivisor() : m(0) {}
+
+ FastDivisor(unsigned div, unsigned max) {
+ MOZ_ASSERT(div <= max);
+
+ // divide_inv_shift is large enough.
+ MOZ_ASSERT((1U << p) >= div);
+
+ // The calculation here for m is formula 26 from Section
+ // 10-9 "Unsigned Division by Divisors >= 1" in
+ // Henry S. Warren, Jr.'s Hacker's Delight, 2nd Ed.
+ unsigned m_ = ((1U << p) + div - 1 - (((1U << p) - 1) % div)) / div;
+
+ // Make sure that max * m does not overflow.
+ MOZ_DIAGNOSTIC_ASSERT(max < UINT_MAX / m_);
+
+ MOZ_ASSERT(m_ <= std::numeric_limits<T>::max());
+ m = static_cast<T>(m_);
+
+ // Initialisation made m non-zero.
+ MOZ_ASSERT(m);
+
+ // Test that all the divisions in the range we expected would work.
+#ifdef MOZ_DEBUG
+ for (unsigned num = 0; num < max; num += div) {
+ MOZ_ASSERT(num / div == divide(num));
+ }
+#endif
+ }
+
+ // Note that this always occurs in uint32_t regardless of m's type. If m is
+ // a uint16_t it will be zero-extended before the multiplication. We also use
+ // uint32_t rather than something that could possibly be larger because it is
+ // most-likely the cheapest multiplication.
+ inline uint32_t divide(uint32_t num) const {
+ // Check that m was initialised.
+ MOZ_ASSERT(m);
+ return (num * m) >> p;
+ }
+};
+
+template <typename T>
+unsigned inline operator/(unsigned num, FastDivisor<T> divisor) {
+ return divisor.divide(num);
+}
+
+// ***************************************************************************
+// Radix tree data structures.
+//
+// The number of bits passed to the template is the number of significant bits
+// in an address to do a radix lookup with.
+//
+// An address is looked up by splitting it in kBitsPerLevel bit chunks, except
+// the most significant bits, where the bit chunk is kBitsAtLevel1 which can be
+// different if Bits is not a multiple of kBitsPerLevel.
+//
+// With e.g. sizeof(void*)=4, Bits=16 and kBitsPerLevel=8, an address is split
+// like the following:
+// 0x12345678 -> mRoot[0x12][0x34]
+template <size_t Bits>
+class AddressRadixTree {
+// Size of each radix tree node (as a power of 2).
+// This impacts tree depth.
+#ifdef HAVE_64BIT_BUILD
+ static const size_t kNodeSize = kCacheLineSize;
+#else
+ static const size_t kNodeSize = 16_KiB;
+#endif
+ static const size_t kBitsPerLevel = LOG2(kNodeSize) - LOG2(sizeof(void*));
+ static const size_t kBitsAtLevel1 =
+ (Bits % kBitsPerLevel) ? Bits % kBitsPerLevel : kBitsPerLevel;
+ static const size_t kHeight = (Bits + kBitsPerLevel - 1) / kBitsPerLevel;
+ static_assert(kBitsAtLevel1 + (kHeight - 1) * kBitsPerLevel == Bits,
+ "AddressRadixTree parameters don't work out");
+
+ Mutex mLock MOZ_UNANNOTATED;
+ void** mRoot;
+
+ public:
+ bool Init();
+
+ inline void* Get(void* aAddr);
+
+ // Returns whether the value was properly set.
+ inline bool Set(void* aAddr, void* aValue);
+
+ inline bool Unset(void* aAddr) { return Set(aAddr, nullptr); }
+
+ private:
+ inline void** GetSlot(void* aAddr, bool aCreate = false);
+};
+
+// ***************************************************************************
+// Arena data structures.
+
+struct arena_bin_t;
+
+struct ArenaChunkMapLink {
+ static RedBlackTreeNode<arena_chunk_map_t>& GetTreeNode(
+ arena_chunk_map_t* aThis) {
+ return aThis->link;
+ }
+};
+
+struct ArenaRunTreeTrait : public ArenaChunkMapLink {
+ static inline Order Compare(arena_chunk_map_t* aNode,
+ arena_chunk_map_t* aOther) {
+ MOZ_ASSERT(aNode);
+ MOZ_ASSERT(aOther);
+ return CompareAddr(aNode, aOther);
+ }
+};
+
+struct ArenaAvailTreeTrait : public ArenaChunkMapLink {
+ static inline Order Compare(arena_chunk_map_t* aNode,
+ arena_chunk_map_t* aOther) {
+ size_t size1 = aNode->bits & ~gPageSizeMask;
+ size_t size2 = aOther->bits & ~gPageSizeMask;
+ Order ret = CompareInt(size1, size2);
+ return (ret != Order::eEqual)
+ ? ret
+ : CompareAddr((aNode->bits & CHUNK_MAP_KEY) ? nullptr : aNode,
+ aOther);
+ }
+};
+
+struct ArenaDirtyChunkTrait {
+ static RedBlackTreeNode<arena_chunk_t>& GetTreeNode(arena_chunk_t* aThis) {
+ return aThis->link_dirty;
+ }
+
+ static inline Order Compare(arena_chunk_t* aNode, arena_chunk_t* aOther) {
+ MOZ_ASSERT(aNode);
+ MOZ_ASSERT(aOther);
+ return CompareAddr(aNode, aOther);
+ }
+};
+
+#ifdef MALLOC_DOUBLE_PURGE
+namespace mozilla {
+
+template <>
+struct GetDoublyLinkedListElement<arena_chunk_t> {
+ static DoublyLinkedListElement<arena_chunk_t>& Get(arena_chunk_t* aThis) {
+ return aThis->chunks_madvised_elem;
+ }
+};
+} // namespace mozilla
+#endif
+
+struct arena_run_t {
+#if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
+ uint32_t mMagic;
+# define ARENA_RUN_MAGIC 0x384adf93
+
+ // On 64-bit platforms, having the arena_bin_t pointer following
+ // the mMagic field means there's padding between both fields, making
+ // the run header larger than necessary.
+ // But when MOZ_DIAGNOSTIC_ASSERT_ENABLED is not set, starting the
+ // header with this field followed by the arena_bin_t pointer yields
+ // the same padding. We do want the mMagic field to appear first, so
+ // depending whether MOZ_DIAGNOSTIC_ASSERT_ENABLED is set or not, we
+ // move some field to avoid padding.
+
+ // Number of free regions in run.
+ unsigned mNumFree;
+#endif
+
+ // Bin this run is associated with.
+ arena_bin_t* mBin;
+
+ // Index of first element that might have a free region.
+ unsigned mRegionsMinElement;
+
+#if !defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
+ // Number of free regions in run.
+ unsigned mNumFree;
+#endif
+
+ // Bitmask of in-use regions (0: in use, 1: free).
+ unsigned mRegionsMask[1]; // Dynamically sized.
+};
+
+struct arena_bin_t {
+ // Current run being used to service allocations of this bin's size
+ // class.
+ arena_run_t* mCurrentRun;
+
+ // Tree of non-full runs. This tree is used when looking for an
+ // existing run when mCurrentRun is no longer usable. We choose the
+ // non-full run that is lowest in memory; this policy tends to keep
+ // objects packed well, and it can also help reduce the number of
+ // almost-empty chunks.
+ RedBlackTree<arena_chunk_map_t, ArenaRunTreeTrait> mNonFullRuns;
+
+ // Bin's size class.
+ size_t mSizeClass;
+
+ // Total number of regions in a run for this bin's size class.
+ uint32_t mRunNumRegions;
+
+ // Number of elements in a run's mRegionsMask for this bin's size class.
+ uint32_t mRunNumRegionsMask;
+
+ // Offset of first region in a run for this bin's size class.
+ uint32_t mRunFirstRegionOffset;
+
+ // Current number of runs in this bin, full or otherwise.
+ uint32_t mNumRuns;
+
+ // A constant for fast division by size class. This value is 16 bits wide so
+ // it is placed last.
+ FastDivisor<uint16_t> mSizeDivisor;
+
+ // Total number of pages in a run for this bin's size class.
+ uint8_t mRunSizePages;
+
+ // Amount of overhead runs are allowed to have.
+ static constexpr double kRunOverhead = 1.6_percent;
+ static constexpr double kRunRelaxedOverhead = 2.4_percent;
+
+ // Initialize a bin for the given size class.
+ // The generated run sizes, for a page size of 4 KiB, are:
+ // size|run size|run size|run size|run
+ // class|size class|size class|size class|size
+ // 4 4 KiB 8 4 KiB 16 4 KiB 32 4 KiB
+ // 48 4 KiB 64 4 KiB 80 4 KiB 96 4 KiB
+ // 112 4 KiB 128 8 KiB 144 4 KiB 160 8 KiB
+ // 176 4 KiB 192 4 KiB 208 8 KiB 224 4 KiB
+ // 240 8 KiB 256 16 KiB 272 8 KiB 288 4 KiB
+ // 304 12 KiB 320 12 KiB 336 4 KiB 352 8 KiB
+ // 368 4 KiB 384 8 KiB 400 20 KiB 416 16 KiB
+ // 432 12 KiB 448 4 KiB 464 16 KiB 480 8 KiB
+ // 496 20 KiB 512 32 KiB 768 16 KiB 1024 64 KiB
+ // 1280 24 KiB 1536 32 KiB 1792 16 KiB 2048 128 KiB
+ // 2304 16 KiB 2560 48 KiB 2816 36 KiB 3072 64 KiB
+ // 3328 36 KiB 3584 32 KiB 3840 64 KiB
+ inline void Init(SizeClass aSizeClass);
+};
+
+// We try to keep the above structure aligned with common cache lines sizes,
+// often that's 64 bytes on x86 and ARM, we don't make assumptions for other
+// architectures.
+#if defined(__x86_64__) || defined(__aarch64__)
+// On 64bit platforms this structure is often 48 bytes
+// long, which means every other array element will be properly aligned.
+static_assert(sizeof(arena_bin_t) == 48);
+#elif defined(__x86__) || defined(__arm__)
+static_assert(sizeof(arena_bin_t) == 32);
+#endif
+
+struct arena_t {
+#if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
+ uint32_t mMagic;
+# define ARENA_MAGIC 0x947d3d24
+#endif
+
+ // Linkage for the tree of arenas by id.
+ RedBlackTreeNode<arena_t> mLink;
+
+ // Arena id, that we keep away from the beginning of the struct so that
+ // free list pointers in TypedBaseAlloc<arena_t> don't overflow in it,
+ // and it keeps the value it had after the destructor.
+ arena_id_t mId;
+
+ // All operations on this arena require that lock be locked.
+ Mutex mLock MOZ_UNANNOTATED;
+
+ arena_stats_t mStats;
+
+ private:
+ // Tree of dirty-page-containing chunks this arena manages.
+ RedBlackTree<arena_chunk_t, ArenaDirtyChunkTrait> mChunksDirty;
+
+#ifdef MALLOC_DOUBLE_PURGE
+ // Head of a linked list of MADV_FREE'd-page-containing chunks this
+ // arena manages.
+ DoublyLinkedList<arena_chunk_t> mChunksMAdvised;
+#endif
+
+ // In order to avoid rapid chunk allocation/deallocation when an arena
+ // oscillates right on the cusp of needing a new chunk, cache the most
+ // recently freed chunk. The spare is left in the arena's chunk trees
+ // until it is deleted.
+ //
+ // There is one spare chunk per arena, rather than one spare total, in
+ // order to avoid interactions between multiple threads that could make
+ // a single spare inadequate.
+ arena_chunk_t* mSpare;
+
+ // A per-arena opt-in to randomize the offset of small allocations
+ bool mRandomizeSmallAllocations;
+
+ // Whether this is a private arena. Multiple public arenas are just a
+ // performance optimization and not a safety feature.
+ //
+ // Since, for example, we don't want thread-local arenas to grow too much, we
+ // use the default arena for bigger allocations. We use this member to allow
+ // realloc() to switch out of our arena if needed (which is not allowed for
+ // private arenas for security).
+ bool mIsPrivate;
+
+ // A pseudorandom number generator. Initially null, it gets initialized
+ // on first use to avoid recursive malloc initialization (e.g. on OSX
+ // arc4random allocates memory).
+ mozilla::non_crypto::XorShift128PlusRNG* mPRNG;
+
+ public:
+ // Current count of pages within unused runs that are potentially
+ // dirty, and for which madvise(... MADV_FREE) has not been called. By
+ // tracking this, we can institute a limit on how much dirty unused
+ // memory is mapped for each arena.
+ size_t mNumDirty;
+
+ // Maximum value allowed for mNumDirty.
+ size_t mMaxDirty;
+
+ int32_t mMaxDirtyIncreaseOverride;
+ int32_t mMaxDirtyDecreaseOverride;
+
+ private:
+ // Size/address-ordered tree of this arena's available runs. This tree
+ // is used for first-best-fit run allocation.
+ RedBlackTree<arena_chunk_map_t, ArenaAvailTreeTrait> mRunsAvail;
+
+ public:
+ // mBins is used to store rings of free regions of the following sizes,
+ // assuming a 16-byte quantum, 4kB pagesize, and default MALLOC_OPTIONS.
+ //
+ // | mBins[i] | size |
+ // +----------+------+
+ // | 0 | 2 |
+ // | 1 | 4 |
+ // | 2 | 8 |
+ // +----------+------+
+ // | 3 | 16 |
+ // | 4 | 32 |
+ // | 5 | 48 |
+ // | 6 | 64 |
+ // | : :
+ // | : :
+ // | 33 | 496 |
+ // | 34 | 512 |
+ // +----------+------+
+ // | 35 | 768 |
+ // | 36 | 1024 |
+ // | : :
+ // | : :
+ // | 46 | 3584 |
+ // | 47 | 3840 |
+ // +----------+------+
+ arena_bin_t mBins[1]; // Dynamically sized.
+
+ explicit arena_t(arena_params_t* aParams, bool aIsPrivate);
+ ~arena_t();
+
+ private:
+ void InitChunk(arena_chunk_t* aChunk, bool aZeroed);
+
+ // This may return a chunk that should be destroyed with chunk_dealloc outside
+ // of the arena lock. It is not the same chunk as was passed in (since that
+ // chunk now becomes mSpare).
+ [[nodiscard]] arena_chunk_t* DeallocChunk(arena_chunk_t* aChunk);
+
+ arena_run_t* AllocRun(size_t aSize, bool aLarge, bool aZero);
+
+ arena_chunk_t* DallocRun(arena_run_t* aRun, bool aDirty);
+
+ [[nodiscard]] bool SplitRun(arena_run_t* aRun, size_t aSize, bool aLarge,
+ bool aZero);
+
+ void TrimRunHead(arena_chunk_t* aChunk, arena_run_t* aRun, size_t aOldSize,
+ size_t aNewSize);
+
+ void TrimRunTail(arena_chunk_t* aChunk, arena_run_t* aRun, size_t aOldSize,
+ size_t aNewSize, bool dirty);
+
+ arena_run_t* GetNonFullBinRun(arena_bin_t* aBin);
+
+ inline uint8_t FindFreeBitInMask(uint32_t aMask, uint32_t& aRng);
+
+ inline void* ArenaRunRegAlloc(arena_run_t* aRun, arena_bin_t* aBin);
+
+ inline void* MallocSmall(size_t aSize, bool aZero);
+
+ void* MallocLarge(size_t aSize, bool aZero);
+
+ void* MallocHuge(size_t aSize, bool aZero);
+
+ void* PallocLarge(size_t aAlignment, size_t aSize, size_t aAllocSize);
+
+ void* PallocHuge(size_t aSize, size_t aAlignment, bool aZero);
+
+ void RallocShrinkLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize,
+ size_t aOldSize);
+
+ bool RallocGrowLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize,
+ size_t aOldSize);
+
+ void* RallocSmallOrLarge(void* aPtr, size_t aSize, size_t aOldSize);
+
+ void* RallocHuge(void* aPtr, size_t aSize, size_t aOldSize);
+
+ public:
+ inline void* Malloc(size_t aSize, bool aZero);
+
+ void* Palloc(size_t aAlignment, size_t aSize);
+
+ // This may return a chunk that should be destroyed with chunk_dealloc outside
+ // of the arena lock. It is not the same chunk as was passed in (since that
+ // chunk now becomes mSpare).
+ [[nodiscard]] inline arena_chunk_t* DallocSmall(arena_chunk_t* aChunk,
+ void* aPtr,
+ arena_chunk_map_t* aMapElm);
+
+ [[nodiscard]] arena_chunk_t* DallocLarge(arena_chunk_t* aChunk, void* aPtr);
+
+ void* Ralloc(void* aPtr, size_t aSize, size_t aOldSize);
+
+ size_t EffectiveMaxDirty();
+
+ // Passing one means purging all.
+ void Purge(size_t aMaxDirty);
+
+ void HardPurge();
+
+ void* operator new(size_t aCount) = delete;
+
+ void* operator new(size_t aCount, const fallible_t&) noexcept;
+
+ void operator delete(void*);
+};
+
+struct ArenaTreeTrait {
+ static RedBlackTreeNode<arena_t>& GetTreeNode(arena_t* aThis) {
+ return aThis->mLink;
+ }
+
+ static inline Order Compare(arena_t* aNode, arena_t* aOther) {
+ MOZ_ASSERT(aNode);
+ MOZ_ASSERT(aOther);
+ return CompareInt(aNode->mId, aOther->mId);
+ }
+};
+
+// Bookkeeping for all the arenas used by the allocator.
+// Arenas are separated in two categories:
+// - "private" arenas, used through the moz_arena_* API
+// - all the other arenas: the default arena, and thread-local arenas,
+// used by the standard API.
+class ArenaCollection {
+ public:
+ bool Init() {
+ mArenas.Init();
+ mPrivateArenas.Init();
+ arena_params_t params;
+ // The main arena allows more dirty pages than the default for other arenas.
+ params.mMaxDirty = opt_dirty_max;
+ mDefaultArena =
+ mLock.Init() ? CreateArena(/* aIsPrivate = */ false, &params) : nullptr;
+ return bool(mDefaultArena);
+ }
+
+ inline arena_t* GetById(arena_id_t aArenaId, bool aIsPrivate);
+
+ arena_t* CreateArena(bool aIsPrivate, arena_params_t* aParams);
+
+ void DisposeArena(arena_t* aArena) {
+ MutexAutoLock lock(mLock);
+ MOZ_RELEASE_ASSERT(mPrivateArenas.Search(aArena),
+ "Can only dispose of private arenas");
+ mPrivateArenas.Remove(aArena);
+ delete aArena;
+ }
+
+ void SetDefaultMaxDirtyPageModifier(int32_t aModifier) {
+ mDefaultMaxDirtyPageModifier = aModifier;
+ }
+ int32_t DefaultMaxDirtyPageModifier() { return mDefaultMaxDirtyPageModifier; }
+
+ using Tree = RedBlackTree<arena_t, ArenaTreeTrait>;
+
+ struct Iterator : Tree::Iterator {
+ explicit Iterator(Tree* aTree, Tree* aSecondTree)
+ : Tree::Iterator(aTree), mNextTree(aSecondTree) {}
+
+ Item<Iterator> begin() {
+ return Item<Iterator>(this, *Tree::Iterator::begin());
+ }
+
+ Item<Iterator> end() { return Item<Iterator>(this, nullptr); }
+
+ arena_t* Next() {
+ arena_t* result = Tree::Iterator::Next();
+ if (!result && mNextTree) {
+ new (this) Iterator(mNextTree, nullptr);
+ result = *Tree::Iterator::begin();
+ }
+ return result;
+ }
+
+ private:
+ Tree* mNextTree;
+ };
+
+ Iterator iter() { return Iterator(&mArenas, &mPrivateArenas); }
+
+ inline arena_t* GetDefault() { return mDefaultArena; }
+
+ Mutex mLock MOZ_UNANNOTATED;
+
+ private:
+ inline arena_t* GetByIdInternal(arena_id_t aArenaId, bool aIsPrivate);
+
+ arena_t* mDefaultArena;
+ arena_id_t mLastPublicArenaId;
+ Tree mArenas;
+ Tree mPrivateArenas;
+ Atomic<int32_t> mDefaultMaxDirtyPageModifier;
+};
+
+static ArenaCollection gArenas;
+
+// ******
+// Chunks.
+static AddressRadixTree<(sizeof(void*) << 3) - LOG2(kChunkSize)> gChunkRTree;
+
+// Protects chunk-related data structures.
+static Mutex chunks_mtx;
+
+// Trees of chunks that were previously allocated (trees differ only in node
+// ordering). These are used when allocating chunks, in an attempt to re-use
+// address space. Depending on function, different tree orderings are needed,
+// which is why there are two trees with the same contents.
+static RedBlackTree<extent_node_t, ExtentTreeSzTrait> gChunksBySize
+ MOZ_GUARDED_BY(chunks_mtx);
+static RedBlackTree<extent_node_t, ExtentTreeTrait> gChunksByAddress
+ MOZ_GUARDED_BY(chunks_mtx);
+
+// Protects huge allocation-related data structures.
+static Mutex huge_mtx;
+
+// Tree of chunks that are stand-alone huge allocations.
+static RedBlackTree<extent_node_t, ExtentTreeTrait> huge
+ MOZ_GUARDED_BY(huge_mtx);
+
+// Huge allocation statistics.
+static size_t huge_allocated MOZ_GUARDED_BY(huge_mtx);
+static size_t huge_mapped MOZ_GUARDED_BY(huge_mtx);
+
+// **************************
+// base (internal allocation).
+
+static Mutex base_mtx;
+
+// Current pages that are being used for internal memory allocations. These
+// pages are carved up in cacheline-size quanta, so that there is no chance of
+// false cache line sharing.
+static void* base_pages MOZ_GUARDED_BY(base_mtx);
+static void* base_next_addr MOZ_GUARDED_BY(base_mtx);
+static void* base_next_decommitted MOZ_GUARDED_BY(base_mtx);
+// Address immediately past base_pages.
+static void* base_past_addr MOZ_GUARDED_BY(base_mtx);
+static size_t base_mapped MOZ_GUARDED_BY(base_mtx);
+static size_t base_committed MOZ_GUARDED_BY(base_mtx);
+
+// ******
+// Arenas.
+
+// The arena associated with the current thread (per
+// jemalloc_thread_local_arena) On OSX, __thread/thread_local circles back
+// calling malloc to allocate storage on first access on each thread, which
+// leads to an infinite loop, but pthread-based TLS somehow doesn't have this
+// problem.
+#if !defined(XP_DARWIN)
+static MOZ_THREAD_LOCAL(arena_t*) thread_arena;
+#else
+static detail::ThreadLocal<arena_t*, detail::ThreadLocalKeyStorage>
+ thread_arena;
+#endif
+
+// *****************************
+// Runtime configuration options.
+//
+// Junk - write "junk" to freshly allocated cells.
+// Poison - write "poison" to cells upon deallocation.
+
+const uint8_t kAllocJunk = 0xe4;
+const uint8_t kAllocPoison = 0xe5;
+
+#ifdef MALLOC_RUNTIME_CONFIG
+static bool opt_junk = true;
+static bool opt_poison = true;
+static bool opt_zero = false;
+#else
+static const bool opt_junk = false;
+static const bool opt_poison = true;
+static const bool opt_zero = false;
+#endif
+static bool opt_randomize_small = true;
+
+// ***************************************************************************
+// Begin forward declarations.
+
+static void* chunk_alloc(size_t aSize, size_t aAlignment, bool aBase,
+ bool* aZeroed = nullptr);
+static void chunk_dealloc(void* aChunk, size_t aSize, ChunkType aType);
+static void chunk_ensure_zero(void* aPtr, size_t aSize, bool aZeroed);
+static void huge_dalloc(void* aPtr, arena_t* aArena);
+static bool malloc_init_hard();
+
+#ifndef XP_WIN
+# ifdef XP_DARWIN
+# define FORK_HOOK extern "C"
+# else
+# define FORK_HOOK static
+# endif
+FORK_HOOK void _malloc_prefork(void);
+FORK_HOOK void _malloc_postfork_parent(void);
+FORK_HOOK void _malloc_postfork_child(void);
+#endif
+
+// End forward declarations.
+// ***************************************************************************
+
+// FreeBSD's pthreads implementation calls malloc(3), so the malloc
+// implementation has to take pains to avoid infinite recursion during
+// initialization.
+// Returns whether the allocator was successfully initialized.
+static inline bool malloc_init() {
+ if (malloc_initialized == false) {
+ return malloc_init_hard();
+ }
+
+ return true;
+}
+
+static void _malloc_message(const char* p) {
+#if !defined(XP_WIN)
+# define _write write
+#endif
+ // Pretend to check _write() errors to suppress gcc warnings about
+ // warn_unused_result annotations in some versions of glibc headers.
+ if (_write(STDERR_FILENO, p, (unsigned int)strlen(p)) < 0) {
+ return;
+ }
+}
+
+template <typename... Args>
+static void _malloc_message(const char* p, Args... args) {
+ _malloc_message(p);
+ _malloc_message(args...);
+}
+
+#ifdef ANDROID
+// Android's pthread.h does not declare pthread_atfork() until SDK 21.
+extern "C" MOZ_EXPORT int pthread_atfork(void (*)(void), void (*)(void),
+ void (*)(void));
+#endif
+
+// ***************************************************************************
+// Begin Utility functions/macros.
+
+// Return the chunk address for allocation address a.
+static inline arena_chunk_t* GetChunkForPtr(const void* aPtr) {
+ return (arena_chunk_t*)(uintptr_t(aPtr) & ~kChunkSizeMask);
+}
+
+// Return the chunk offset of address a.
+static inline size_t GetChunkOffsetForPtr(const void* aPtr) {
+ return (size_t)(uintptr_t(aPtr) & kChunkSizeMask);
+}
+
+static inline const char* _getprogname(void) { return "<jemalloc>"; }
+
+static inline void MaybePoison(void* aPtr, size_t aSize) {
+ if (opt_poison) {
+ memset(aPtr, kAllocPoison, aSize);
+ }
+}
+
+// Fill the given range of memory with zeroes or junk depending on opt_junk and
+// opt_zero.
+static inline void ApplyZeroOrJunk(void* aPtr, size_t aSize) {
+ if (opt_junk) {
+ memset(aPtr, kAllocJunk, aSize);
+ } else if (opt_zero) {
+ memset(aPtr, 0, aSize);
+ }
+}
+
+// On Windows, delay crashing on OOM.
+#ifdef XP_WIN
+
+// Implementation of VirtualAlloc wrapper (bug 1716727).
+namespace MozAllocRetries {
+
+// Maximum retry count on OOM.
+constexpr size_t kMaxAttempts = 10;
+// Minimum delay time between retries. (The actual delay time may be larger. See
+// Microsoft's documentation for ::Sleep() for details.)
+constexpr size_t kDelayMs = 50;
+
+using StallSpecs = ::mozilla::StallSpecs;
+
+static constexpr StallSpecs maxStall = {.maxAttempts = kMaxAttempts,
+ .delayMs = kDelayMs};
+
+static inline StallSpecs GetStallSpecs() {
+# if defined(JS_STANDALONE)
+ // GetGeckoProcessType() isn't available in this configuration. (SpiderMonkey
+ // on Windows mostly skips this in favor of directly calling ::VirtualAlloc(),
+ // though, so it's probably not going to matter whether we stall here or not.)
+ return maxStall;
+# else
+ switch (GetGeckoProcessType()) {
+ // For the main process, stall for the maximum permissible time period. (The
+ // main process is the most important one to keep alive.)
+ case GeckoProcessType::GeckoProcessType_Default:
+ return maxStall;
+
+ // For all other process types, stall for at most half as long.
+ default:
+ return {.maxAttempts = maxStall.maxAttempts / 2,
+ .delayMs = maxStall.delayMs};
+ }
+# endif
+}
+
+// Drop-in wrapper around VirtualAlloc. When out of memory, may attempt to stall
+// and retry rather than returning immediately, in hopes that the page file is
+// about to be expanded by Windows.
+//
+// Ref: https://docs.microsoft.com/en-us/troubleshoot/windows-client/performance/slow-page-file-growth-memory-allocation-errors
+[[nodiscard]] void* MozVirtualAlloc(LPVOID lpAddress, SIZE_T dwSize,
+ DWORD flAllocationType, DWORD flProtect) {
+ DWORD const lastError = ::GetLastError();
+
+ constexpr auto IsOOMError = [] {
+ switch (::GetLastError()) {
+ // This is the usual error result from VirtualAlloc for OOM.
+ case ERROR_COMMITMENT_LIMIT:
+ // Although rare, this has also been observed in low-memory situations.
+ // (Presumably this means Windows can't allocate enough kernel-side space
+ // for its own internal representation of the process's virtual address
+ // space.)
+ case ERROR_NOT_ENOUGH_MEMORY:
+ return true;
+ }
+ return false;
+ };
+
+ {
+ void* ptr = ::VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect);
+ if (MOZ_LIKELY(ptr)) return ptr;
+
+ // We can't do anything for errors other than OOM...
+ if (!IsOOMError()) return nullptr;
+ // ... or if this wasn't a request to commit memory in the first place.
+ // (This function has no strategy for resolving MEM_RESERVE failures.)
+ if (!(flAllocationType & MEM_COMMIT)) return nullptr;
+ }
+
+ // Retry as many times as desired (possibly zero).
+ const StallSpecs stallSpecs = GetStallSpecs();
+
+ const auto ret =
+ stallSpecs.StallAndRetry(&::Sleep, [&]() -> std::optional<void*> {
+ void* ptr =
+ ::VirtualAlloc(lpAddress, dwSize, flAllocationType, flProtect);
+
+ if (ptr) {
+ // The OOM status has been handled, and should not be reported to
+ // telemetry.
+ if (IsOOMError()) {
+ ::SetLastError(lastError);
+ }
+ return ptr;
+ }
+
+ // Failure for some reason other than OOM.
+ if (!IsOOMError()) {
+ return nullptr;
+ }
+
+ return std::nullopt;
+ });
+
+ return ret.value_or(nullptr);
+}
+} // namespace MozAllocRetries
+
+using MozAllocRetries::MozVirtualAlloc;
+
+namespace mozilla {
+MOZ_JEMALLOC_API StallSpecs GetAllocatorStallSpecs() {
+ return ::MozAllocRetries::GetStallSpecs();
+}
+} // namespace mozilla
+
+#endif // XP_WIN
+
+// ***************************************************************************
+
+static inline void pages_decommit(void* aAddr, size_t aSize) {
+#ifdef XP_WIN
+ // The region starting at addr may have been allocated in multiple calls
+ // to VirtualAlloc and recycled, so decommitting the entire region in one
+ // go may not be valid. However, since we allocate at least a chunk at a
+ // time, we may touch any region in chunksized increments.
+ size_t pages_size = std::min(aSize, kChunkSize - GetChunkOffsetForPtr(aAddr));
+ while (aSize > 0) {
+ // This will cause Access Violation on read and write and thus act as a
+ // guard page or region as well.
+ if (!VirtualFree(aAddr, pages_size, MEM_DECOMMIT)) {
+ MOZ_CRASH();
+ }
+ aAddr = (void*)((uintptr_t)aAddr + pages_size);
+ aSize -= pages_size;
+ pages_size = std::min(aSize, kChunkSize);
+ }
+#else
+ if (mmap(aAddr, aSize, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1,
+ 0) == MAP_FAILED) {
+ // We'd like to report the OOM for our tooling, but we can't allocate
+ // memory at this point, so avoid the use of printf.
+ const char out_of_mappings[] =
+ "[unhandlable oom] Failed to mmap, likely no more mappings "
+ "available " __FILE__ " : " MOZ_STRINGIFY(__LINE__);
+ if (errno == ENOMEM) {
+# ifndef ANDROID
+ fputs(out_of_mappings, stderr);
+ fflush(stderr);
+# endif
+ MOZ_CRASH_ANNOTATE(out_of_mappings);
+ }
+ MOZ_REALLY_CRASH(__LINE__);
+ }
+ MozTagAnonymousMemory(aAddr, aSize, "jemalloc-decommitted");
+#endif
+}
+
+// Commit pages. Returns whether pages were committed.
+[[nodiscard]] static inline bool pages_commit(void* aAddr, size_t aSize) {
+#ifdef XP_WIN
+ // The region starting at addr may have been allocated in multiple calls
+ // to VirtualAlloc and recycled, so committing the entire region in one
+ // go may not be valid. However, since we allocate at least a chunk at a
+ // time, we may touch any region in chunksized increments.
+ size_t pages_size = std::min(aSize, kChunkSize - GetChunkOffsetForPtr(aAddr));
+ while (aSize > 0) {
+ if (!MozVirtualAlloc(aAddr, pages_size, MEM_COMMIT, PAGE_READWRITE)) {
+ return false;
+ }
+ aAddr = (void*)((uintptr_t)aAddr + pages_size);
+ aSize -= pages_size;
+ pages_size = std::min(aSize, kChunkSize);
+ }
+#else
+ if (mmap(aAddr, aSize, PROT_READ | PROT_WRITE,
+ MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == MAP_FAILED) {
+ return false;
+ }
+ MozTagAnonymousMemory(aAddr, aSize, "jemalloc");
+#endif
+ return true;
+}
+
+static bool base_pages_alloc(size_t minsize) MOZ_REQUIRES(base_mtx) {
+ size_t csize;
+ size_t pminsize;
+
+ MOZ_ASSERT(minsize != 0);
+ csize = CHUNK_CEILING(minsize);
+ base_pages = chunk_alloc(csize, kChunkSize, true);
+ if (!base_pages) {
+ return true;
+ }
+ base_next_addr = base_pages;
+ base_past_addr = (void*)((uintptr_t)base_pages + csize);
+ // Leave enough pages for minsize committed, since otherwise they would
+ // have to be immediately recommitted.
+ pminsize = PAGE_CEILING(minsize);
+ base_next_decommitted = (void*)((uintptr_t)base_pages + pminsize);
+ if (pminsize < csize) {
+ pages_decommit(base_next_decommitted, csize - pminsize);
+ }
+ base_mapped += csize;
+ base_committed += pminsize;
+
+ return false;
+}
+
+static void* base_alloc(size_t aSize) {
+ void* ret;
+ size_t csize;
+
+ // Round size up to nearest multiple of the cacheline size.
+ csize = CACHELINE_CEILING(aSize);
+
+ MutexAutoLock lock(base_mtx);
+ // Make sure there's enough space for the allocation.
+ if ((uintptr_t)base_next_addr + csize > (uintptr_t)base_past_addr) {
+ if (base_pages_alloc(csize)) {
+ return nullptr;
+ }
+ }
+ // Allocate.
+ ret = base_next_addr;
+ base_next_addr = (void*)((uintptr_t)base_next_addr + csize);
+ // Make sure enough pages are committed for the new allocation.
+ if ((uintptr_t)base_next_addr > (uintptr_t)base_next_decommitted) {
+ void* pbase_next_addr = (void*)(PAGE_CEILING((uintptr_t)base_next_addr));
+
+ if (!pages_commit(
+ base_next_decommitted,
+ (uintptr_t)pbase_next_addr - (uintptr_t)base_next_decommitted)) {
+ return nullptr;
+ }
+
+ base_committed +=
+ (uintptr_t)pbase_next_addr - (uintptr_t)base_next_decommitted;
+ base_next_decommitted = pbase_next_addr;
+ }
+
+ return ret;
+}
+
+static void* base_calloc(size_t aNumber, size_t aSize) {
+ void* ret = base_alloc(aNumber * aSize);
+ if (ret) {
+ memset(ret, 0, aNumber * aSize);
+ }
+ return ret;
+}
+
+// A specialization of the base allocator with a free list.
+template <typename T>
+struct TypedBaseAlloc {
+ static T* sFirstFree;
+
+ static size_t size_of() { return sizeof(T); }
+
+ static T* alloc() {
+ T* ret;
+
+ base_mtx.Lock();
+ if (sFirstFree) {
+ ret = sFirstFree;
+ sFirstFree = *(T**)ret;
+ base_mtx.Unlock();
+ } else {
+ base_mtx.Unlock();
+ ret = (T*)base_alloc(size_of());
+ }
+
+ return ret;
+ }
+
+ static void dealloc(T* aNode) {
+ MutexAutoLock lock(base_mtx);
+ *(T**)aNode = sFirstFree;
+ sFirstFree = aNode;
+ }
+};
+
+using ExtentAlloc = TypedBaseAlloc<extent_node_t>;
+
+template <>
+extent_node_t* ExtentAlloc::sFirstFree = nullptr;
+
+template <>
+arena_t* TypedBaseAlloc<arena_t>::sFirstFree = nullptr;
+
+template <>
+size_t TypedBaseAlloc<arena_t>::size_of() {
+ // Allocate enough space for trailing bins.
+ return sizeof(arena_t) + (sizeof(arena_bin_t) * (NUM_SMALL_CLASSES - 1));
+}
+
+template <typename T>
+struct BaseAllocFreePolicy {
+ void operator()(T* aPtr) { TypedBaseAlloc<T>::dealloc(aPtr); }
+};
+
+using UniqueBaseNode =
+ UniquePtr<extent_node_t, BaseAllocFreePolicy<extent_node_t>>;
+
+// End Utility functions/macros.
+// ***************************************************************************
+// Begin chunk management functions.
+
+#ifdef XP_WIN
+
+static void* pages_map(void* aAddr, size_t aSize) {
+ void* ret = nullptr;
+ ret = MozVirtualAlloc(aAddr, aSize, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+ return ret;
+}
+
+static void pages_unmap(void* aAddr, size_t aSize) {
+ if (VirtualFree(aAddr, 0, MEM_RELEASE) == 0) {
+ _malloc_message(_getprogname(), ": (malloc) Error in VirtualFree()\n");
+ }
+}
+#else
+
+static void pages_unmap(void* aAddr, size_t aSize) {
+ if (munmap(aAddr, aSize) == -1) {
+ char buf[64];
+
+ if (strerror_r(errno, buf, sizeof(buf)) == 0) {
+ _malloc_message(_getprogname(), ": (malloc) Error in munmap(): ", buf,
+ "\n");
+ }
+ }
+}
+
+static void* pages_map(void* aAddr, size_t aSize) {
+ void* ret;
+# if defined(__ia64__) || \
+ (defined(__sparc__) && defined(__arch64__) && defined(__linux__))
+ // The JS engine assumes that all allocated pointers have their high 17 bits
+ // clear, which ia64's mmap doesn't support directly. However, we can emulate
+ // it by passing mmap an "addr" parameter with those bits clear. The mmap will
+ // return that address, or the nearest available memory above that address,
+ // providing a near-guarantee that those bits are clear. If they are not, we
+ // return nullptr below to indicate out-of-memory.
+ //
+ // The addr is chosen as 0x0000070000000000, which still allows about 120TB of
+ // virtual address space.
+ //
+ // See Bug 589735 for more information.
+ bool check_placement = true;
+ if (!aAddr) {
+ aAddr = (void*)0x0000070000000000;
+ check_placement = false;
+ }
+# endif
+
+# if defined(__sparc__) && defined(__arch64__) && defined(__linux__)
+ const uintptr_t start = 0x0000070000000000ULL;
+ const uintptr_t end = 0x0000800000000000ULL;
+
+ // Copied from js/src/gc/Memory.cpp and adapted for this source
+ uintptr_t hint;
+ void* region = MAP_FAILED;
+ for (hint = start; region == MAP_FAILED && hint + aSize <= end;
+ hint += kChunkSize) {
+ region = mmap((void*)hint, aSize, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (region != MAP_FAILED) {
+ if (((size_t)region + (aSize - 1)) & 0xffff800000000000) {
+ if (munmap(region, aSize)) {
+ MOZ_ASSERT(errno == ENOMEM);
+ }
+ region = MAP_FAILED;
+ }
+ }
+ }
+ ret = region;
+# else
+ // We don't use MAP_FIXED here, because it can cause the *replacement*
+ // of existing mappings, and we only want to create new mappings.
+ ret =
+ mmap(aAddr, aSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+ MOZ_ASSERT(ret);
+# endif
+ if (ret == MAP_FAILED) {
+ ret = nullptr;
+ }
+# if defined(__ia64__) || \
+ (defined(__sparc__) && defined(__arch64__) && defined(__linux__))
+ // If the allocated memory doesn't have its upper 17 bits clear, consider it
+ // as out of memory.
+ else if ((long long)ret & 0xffff800000000000) {
+ munmap(ret, aSize);
+ ret = nullptr;
+ }
+ // If the caller requested a specific memory location, verify that's what mmap
+ // returned.
+ else if (check_placement && ret != aAddr) {
+# else
+ else if (aAddr && ret != aAddr) {
+# endif
+ // We succeeded in mapping memory, but not in the right place.
+ pages_unmap(ret, aSize);
+ ret = nullptr;
+ }
+ if (ret) {
+ MozTagAnonymousMemory(ret, aSize, "jemalloc");
+ }
+
+# if defined(__ia64__) || \
+ (defined(__sparc__) && defined(__arch64__) && defined(__linux__))
+ MOZ_ASSERT(!ret || (!check_placement && ret) ||
+ (check_placement && ret == aAddr));
+# else
+ MOZ_ASSERT(!ret || (!aAddr && ret != aAddr) || (aAddr && ret == aAddr));
+# endif
+ return ret;
+}
+#endif
+
+#ifdef XP_DARWIN
+# define VM_COPY_MIN kChunkSize
+static inline void pages_copy(void* dest, const void* src, size_t n) {
+ MOZ_ASSERT((void*)((uintptr_t)dest & ~gPageSizeMask) == dest);
+ MOZ_ASSERT(n >= VM_COPY_MIN);
+ MOZ_ASSERT((void*)((uintptr_t)src & ~gPageSizeMask) == src);
+
+ kern_return_t r = vm_copy(mach_task_self(), (vm_address_t)src, (vm_size_t)n,
+ (vm_address_t)dest);
+ if (r != KERN_SUCCESS) {
+ MOZ_CRASH("vm_copy() failed");
+ }
+}
+
+#endif
+
+template <size_t Bits>
+bool AddressRadixTree<Bits>::Init() {
+ mLock.Init();
+ mRoot = (void**)base_calloc(1 << kBitsAtLevel1, sizeof(void*));
+ return mRoot;
+}
+
+template <size_t Bits>
+void** AddressRadixTree<Bits>::GetSlot(void* aKey, bool aCreate) {
+ uintptr_t key = reinterpret_cast<uintptr_t>(aKey);
+ uintptr_t subkey;
+ unsigned i, lshift, height, bits;
+ void** node;
+ void** child;
+
+ for (i = lshift = 0, height = kHeight, node = mRoot; i < height - 1;
+ i++, lshift += bits, node = child) {
+ bits = i ? kBitsPerLevel : kBitsAtLevel1;
+ subkey = (key << lshift) >> ((sizeof(void*) << 3) - bits);
+ child = (void**)node[subkey];
+ if (!child && aCreate) {
+ child = (void**)base_calloc(1 << kBitsPerLevel, sizeof(void*));
+ if (child) {
+ node[subkey] = child;
+ }
+ }
+ if (!child) {
+ return nullptr;
+ }
+ }
+
+ // node is a leaf, so it contains values rather than node
+ // pointers.
+ bits = i ? kBitsPerLevel : kBitsAtLevel1;
+ subkey = (key << lshift) >> ((sizeof(void*) << 3) - bits);
+ return &node[subkey];
+}
+
+template <size_t Bits>
+void* AddressRadixTree<Bits>::Get(void* aKey) {
+ void* ret = nullptr;
+
+ void** slot = GetSlot(aKey);
+
+ if (slot) {
+ ret = *slot;
+ }
+#ifdef MOZ_DEBUG
+ MutexAutoLock lock(mLock);
+
+ // Suppose that it were possible for a jemalloc-allocated chunk to be
+ // munmap()ped, followed by a different allocator in another thread re-using
+ // overlapping virtual memory, all without invalidating the cached rtree
+ // value. The result would be a false positive (the rtree would claim that
+ // jemalloc owns memory that it had actually discarded). I don't think this
+ // scenario is possible, but the following assertion is a prudent sanity
+ // check.
+ if (!slot) {
+ // In case a slot has been created in the meantime.
+ slot = GetSlot(aKey);
+ }
+ if (slot) {
+ // The MutexAutoLock above should act as a memory barrier, forcing
+ // the compiler to emit a new read instruction for *slot.
+ MOZ_ASSERT(ret == *slot);
+ } else {
+ MOZ_ASSERT(ret == nullptr);
+ }
+#endif
+ return ret;
+}
+
+template <size_t Bits>
+bool AddressRadixTree<Bits>::Set(void* aKey, void* aValue) {
+ MutexAutoLock lock(mLock);
+ void** slot = GetSlot(aKey, /* aCreate = */ true);
+ if (slot) {
+ *slot = aValue;
+ }
+ return slot;
+}
+
+// pages_trim, chunk_alloc_mmap_slow and chunk_alloc_mmap were cherry-picked
+// from upstream jemalloc 3.4.1 to fix Mozilla bug 956501.
+
+// Return the offset between a and the nearest aligned address at or below a.
+#define ALIGNMENT_ADDR2OFFSET(a, alignment) \
+ ((size_t)((uintptr_t)(a) & ((alignment)-1)))
+
+// Return the smallest alignment multiple that is >= s.
+#define ALIGNMENT_CEILING(s, alignment) \
+ (((s) + ((alignment)-1)) & (~((alignment)-1)))
+
+static void* pages_trim(void* addr, size_t alloc_size, size_t leadsize,
+ size_t size) {
+ void* ret = (void*)((uintptr_t)addr + leadsize);
+
+ MOZ_ASSERT(alloc_size >= leadsize + size);
+#ifdef XP_WIN
+ {
+ void* new_addr;
+
+ pages_unmap(addr, alloc_size);
+ new_addr = pages_map(ret, size);
+ if (new_addr == ret) {
+ return ret;
+ }
+ if (new_addr) {
+ pages_unmap(new_addr, size);
+ }
+ return nullptr;
+ }
+#else
+ {
+ size_t trailsize = alloc_size - leadsize - size;
+
+ if (leadsize != 0) {
+ pages_unmap(addr, leadsize);
+ }
+ if (trailsize != 0) {
+ pages_unmap((void*)((uintptr_t)ret + size), trailsize);
+ }
+ return ret;
+ }
+#endif
+}
+
+static void* chunk_alloc_mmap_slow(size_t size, size_t alignment) {
+ void *ret, *pages;
+ size_t alloc_size, leadsize;
+
+ alloc_size = size + alignment - gRealPageSize;
+ // Beware size_t wrap-around.
+ if (alloc_size < size) {
+ return nullptr;
+ }
+ do {
+ pages = pages_map(nullptr, alloc_size);
+ if (!pages) {
+ return nullptr;
+ }
+ leadsize =
+ ALIGNMENT_CEILING((uintptr_t)pages, alignment) - (uintptr_t)pages;
+ ret = pages_trim(pages, alloc_size, leadsize, size);
+ } while (!ret);
+
+ MOZ_ASSERT(ret);
+ return ret;
+}
+
+static void* chunk_alloc_mmap(size_t size, size_t alignment) {
+ void* ret;
+ size_t offset;
+
+ // Ideally, there would be a way to specify alignment to mmap() (like
+ // NetBSD has), but in the absence of such a feature, we have to work
+ // hard to efficiently create aligned mappings. The reliable, but
+ // slow method is to create a mapping that is over-sized, then trim the
+ // excess. However, that always results in one or two calls to
+ // pages_unmap().
+ //
+ // Optimistically try mapping precisely the right amount before falling
+ // back to the slow method, with the expectation that the optimistic
+ // approach works most of the time.
+ ret = pages_map(nullptr, size);
+ if (!ret) {
+ return nullptr;
+ }
+ offset = ALIGNMENT_ADDR2OFFSET(ret, alignment);
+ if (offset != 0) {
+ pages_unmap(ret, size);
+ return chunk_alloc_mmap_slow(size, alignment);
+ }
+
+ MOZ_ASSERT(ret);
+ return ret;
+}
+
+// Purge and release the pages in the chunk of length `length` at `addr` to
+// the OS.
+// Returns whether the pages are guaranteed to be full of zeroes when the
+// function returns.
+// The force_zero argument explicitly requests that the memory is guaranteed
+// to be full of zeroes when the function returns.
+static bool pages_purge(void* addr, size_t length, bool force_zero) {
+ pages_decommit(addr, length);
+ return true;
+}
+
+static void* chunk_recycle(size_t aSize, size_t aAlignment, bool* aZeroed) {
+ extent_node_t key;
+
+ size_t alloc_size = aSize + aAlignment - kChunkSize;
+ // Beware size_t wrap-around.
+ if (alloc_size < aSize) {
+ return nullptr;
+ }
+ key.mAddr = nullptr;
+ key.mSize = alloc_size;
+ chunks_mtx.Lock();
+ extent_node_t* node = gChunksBySize.SearchOrNext(&key);
+ if (!node) {
+ chunks_mtx.Unlock();
+ return nullptr;
+ }
+ size_t leadsize = ALIGNMENT_CEILING((uintptr_t)node->mAddr, aAlignment) -
+ (uintptr_t)node->mAddr;
+ MOZ_ASSERT(node->mSize >= leadsize + aSize);
+ size_t trailsize = node->mSize - leadsize - aSize;
+ void* ret = (void*)((uintptr_t)node->mAddr + leadsize);
+ ChunkType chunk_type = node->mChunkType;
+ if (aZeroed) {
+ *aZeroed = (chunk_type == ZEROED_CHUNK);
+ }
+ // Remove node from the tree.
+ gChunksBySize.Remove(node);
+ gChunksByAddress.Remove(node);
+ if (leadsize != 0) {
+ // Insert the leading space as a smaller chunk.
+ node->mSize = leadsize;
+ gChunksBySize.Insert(node);
+ gChunksByAddress.Insert(node);
+ node = nullptr;
+ }
+ if (trailsize != 0) {
+ // Insert the trailing space as a smaller chunk.
+ if (!node) {
+ // An additional node is required, but
+ // TypedBaseAlloc::alloc() can cause a new base chunk to be
+ // allocated. Drop chunks_mtx in order to avoid
+ // deadlock, and if node allocation fails, deallocate
+ // the result before returning an error.
+ chunks_mtx.Unlock();
+ node = ExtentAlloc::alloc();
+ if (!node) {
+ chunk_dealloc(ret, aSize, chunk_type);
+ return nullptr;
+ }
+ chunks_mtx.Lock();
+ }
+ node->mAddr = (void*)((uintptr_t)(ret) + aSize);
+ node->mSize = trailsize;
+ node->mChunkType = chunk_type;
+ gChunksBySize.Insert(node);
+ gChunksByAddress.Insert(node);
+ node = nullptr;
+ }
+
+ gRecycledSize -= aSize;
+
+ chunks_mtx.Unlock();
+
+ if (node) {
+ ExtentAlloc::dealloc(node);
+ }
+ if (!pages_commit(ret, aSize)) {
+ return nullptr;
+ }
+ // pages_commit is guaranteed to zero the chunk.
+ if (aZeroed) {
+ *aZeroed = true;
+ }
+
+ return ret;
+}
+
+#ifdef XP_WIN
+// On Windows, calls to VirtualAlloc and VirtualFree must be matched, making it
+// awkward to recycle allocations of varying sizes. Therefore we only allow
+// recycling when the size equals the chunksize, unless deallocation is entirely
+// disabled.
+# define CAN_RECYCLE(size) ((size) == kChunkSize)
+#else
+# define CAN_RECYCLE(size) true
+#endif
+
+// Allocates `size` bytes of system memory aligned for `alignment`.
+// `base` indicates whether the memory will be used for the base allocator
+// (e.g. base_alloc).
+// `zeroed` is an outvalue that returns whether the allocated memory is
+// guaranteed to be full of zeroes. It can be omitted when the caller doesn't
+// care about the result.
+static void* chunk_alloc(size_t aSize, size_t aAlignment, bool aBase,
+ bool* aZeroed) {
+ void* ret = nullptr;
+
+ MOZ_ASSERT(aSize != 0);
+ MOZ_ASSERT((aSize & kChunkSizeMask) == 0);
+ MOZ_ASSERT(aAlignment != 0);
+ MOZ_ASSERT((aAlignment & kChunkSizeMask) == 0);
+
+ // Base allocations can't be fulfilled by recycling because of
+ // possible deadlock or infinite recursion.
+ if (CAN_RECYCLE(aSize) && !aBase) {
+ ret = chunk_recycle(aSize, aAlignment, aZeroed);
+ }
+ if (!ret) {
+ ret = chunk_alloc_mmap(aSize, aAlignment);
+ if (aZeroed) {
+ *aZeroed = true;
+ }
+ }
+ if (ret && !aBase) {
+ if (!gChunkRTree.Set(ret, ret)) {
+ chunk_dealloc(ret, aSize, UNKNOWN_CHUNK);
+ return nullptr;
+ }
+ }
+
+ MOZ_ASSERT(GetChunkOffsetForPtr(ret) == 0);
+ return ret;
+}
+
+static void chunk_ensure_zero(void* aPtr, size_t aSize, bool aZeroed) {
+ if (aZeroed == false) {
+ memset(aPtr, 0, aSize);
+ }
+#ifdef MOZ_DEBUG
+ else {
+ size_t i;
+ size_t* p = (size_t*)(uintptr_t)aPtr;
+
+ for (i = 0; i < aSize / sizeof(size_t); i++) {
+ MOZ_ASSERT(p[i] == 0);
+ }
+ }
+#endif
+}
+
+static void chunk_record(void* aChunk, size_t aSize, ChunkType aType) {
+ extent_node_t key;
+
+ if (aType != ZEROED_CHUNK) {
+ if (pages_purge(aChunk, aSize, aType == HUGE_CHUNK)) {
+ aType = ZEROED_CHUNK;
+ }
+ }
+
+ // Allocate a node before acquiring chunks_mtx even though it might not
+ // be needed, because TypedBaseAlloc::alloc() may cause a new base chunk to
+ // be allocated, which could cause deadlock if chunks_mtx were already
+ // held.
+ UniqueBaseNode xnode(ExtentAlloc::alloc());
+ // Use xprev to implement conditional deferred deallocation of prev.
+ UniqueBaseNode xprev;
+
+ // RAII deallocates xnode and xprev defined above after unlocking
+ // in order to avoid potential dead-locks
+ MutexAutoLock lock(chunks_mtx);
+ key.mAddr = (void*)((uintptr_t)aChunk + aSize);
+ extent_node_t* node = gChunksByAddress.SearchOrNext(&key);
+ // Try to coalesce forward.
+ if (node && node->mAddr == key.mAddr) {
+ // Coalesce chunk with the following address range. This does
+ // not change the position within gChunksByAddress, so only
+ // remove/insert from/into gChunksBySize.
+ gChunksBySize.Remove(node);
+ node->mAddr = aChunk;
+ node->mSize += aSize;
+ if (node->mChunkType != aType) {
+ node->mChunkType = RECYCLED_CHUNK;
+ }
+ gChunksBySize.Insert(node);
+ } else {
+ // Coalescing forward failed, so insert a new node.
+ if (!xnode) {
+ // TypedBaseAlloc::alloc() failed, which is an exceedingly
+ // unlikely failure. Leak chunk; its pages have
+ // already been purged, so this is only a virtual
+ // memory leak.
+ return;
+ }
+ node = xnode.release();
+ node->mAddr = aChunk;
+ node->mSize = aSize;
+ node->mChunkType = aType;
+ gChunksByAddress.Insert(node);
+ gChunksBySize.Insert(node);
+ }
+
+ // Try to coalesce backward.
+ extent_node_t* prev = gChunksByAddress.Prev(node);
+ if (prev && (void*)((uintptr_t)prev->mAddr + prev->mSize) == aChunk) {
+ // Coalesce chunk with the previous address range. This does
+ // not change the position within gChunksByAddress, so only
+ // remove/insert node from/into gChunksBySize.
+ gChunksBySize.Remove(prev);
+ gChunksByAddress.Remove(prev);
+
+ gChunksBySize.Remove(node);
+ node->mAddr = prev->mAddr;
+ node->mSize += prev->mSize;
+ if (node->mChunkType != prev->mChunkType) {
+ node->mChunkType = RECYCLED_CHUNK;
+ }
+ gChunksBySize.Insert(node);
+
+ xprev.reset(prev);
+ }
+
+ gRecycledSize += aSize;
+}
+
+static void chunk_dealloc(void* aChunk, size_t aSize, ChunkType aType) {
+ MOZ_ASSERT(aChunk);
+ MOZ_ASSERT(GetChunkOffsetForPtr(aChunk) == 0);
+ MOZ_ASSERT(aSize != 0);
+ MOZ_ASSERT((aSize & kChunkSizeMask) == 0);
+
+ gChunkRTree.Unset(aChunk);
+
+ if (CAN_RECYCLE(aSize)) {
+ size_t recycled_so_far = gRecycledSize;
+ // In case some race condition put us above the limit.
+ if (recycled_so_far < gRecycleLimit) {
+ size_t recycle_remaining = gRecycleLimit - recycled_so_far;
+ size_t to_recycle;
+ if (aSize > recycle_remaining) {
+ to_recycle = recycle_remaining;
+ // Drop pages that would overflow the recycle limit
+ pages_trim(aChunk, aSize, 0, to_recycle);
+ } else {
+ to_recycle = aSize;
+ }
+ chunk_record(aChunk, to_recycle, aType);
+ return;
+ }
+ }
+
+ pages_unmap(aChunk, aSize);
+}
+
+#undef CAN_RECYCLE
+
+// End chunk management functions.
+// ***************************************************************************
+// Begin arena.
+
+static inline arena_t* thread_local_arena(bool enabled) {
+ arena_t* arena;
+
+ if (enabled) {
+ // The arena will essentially be leaked if this function is
+ // called with `false`, but it doesn't matter at the moment.
+ // because in practice nothing actually calls this function
+ // with `false`, except maybe at shutdown.
+ arena =
+ gArenas.CreateArena(/* aIsPrivate = */ false, /* aParams = */ nullptr);
+ } else {
+ arena = gArenas.GetDefault();
+ }
+ thread_arena.set(arena);
+ return arena;
+}
+
+template <>
+inline void MozJemalloc::jemalloc_thread_local_arena(bool aEnabled) {
+ if (malloc_init()) {
+ thread_local_arena(aEnabled);
+ }
+}
+
+// Choose an arena based on a per-thread value.
+static inline arena_t* choose_arena(size_t size) {
+ arena_t* ret = nullptr;
+
+ // We can only use TLS if this is a PIC library, since for the static
+ // library version, libc's malloc is used by TLS allocation, which
+ // introduces a bootstrapping issue.
+
+ if (size > kMaxQuantumClass) {
+ // Force the default arena for larger allocations.
+ ret = gArenas.GetDefault();
+ } else {
+ // Check TLS to see if our thread has requested a pinned arena.
+ ret = thread_arena.get();
+ if (!ret) {
+ // Nothing in TLS. Pin this thread to the default arena.
+ ret = thread_local_arena(false);
+ }
+ }
+
+ MOZ_DIAGNOSTIC_ASSERT(ret);
+ return ret;
+}
+
+inline uint8_t arena_t::FindFreeBitInMask(uint32_t aMask, uint32_t& aRng) {
+ if (mPRNG != nullptr) {
+ if (aRng == UINT_MAX) {
+ aRng = mPRNG->next() % 32;
+ }
+ uint8_t bitIndex;
+ // RotateRight asserts when provided bad input.
+ aMask = aRng ? RotateRight(aMask, aRng)
+ : aMask; // Rotate the mask a random number of slots
+ bitIndex = CountTrailingZeroes32(aMask);
+ return (bitIndex + aRng) % 32;
+ }
+ return CountTrailingZeroes32(aMask);
+}
+
+inline void* arena_t::ArenaRunRegAlloc(arena_run_t* aRun, arena_bin_t* aBin) {
+ void* ret;
+ unsigned i, mask, bit, regind;
+ uint32_t rndPos = UINT_MAX;
+
+ MOZ_DIAGNOSTIC_ASSERT(aRun->mMagic == ARENA_RUN_MAGIC);
+ MOZ_ASSERT(aRun->mRegionsMinElement < aBin->mRunNumRegionsMask);
+
+ // Move the first check outside the loop, so that aRun->mRegionsMinElement can
+ // be updated unconditionally, without the possibility of updating it
+ // multiple times.
+ i = aRun->mRegionsMinElement;
+ mask = aRun->mRegionsMask[i];
+ if (mask != 0) {
+ bit = FindFreeBitInMask(mask, rndPos);
+
+ regind = ((i << (LOG2(sizeof(int)) + 3)) + bit);
+ MOZ_ASSERT(regind < aBin->mRunNumRegions);
+ ret = (void*)(((uintptr_t)aRun) + aBin->mRunFirstRegionOffset +
+ (aBin->mSizeClass * regind));
+
+ // Clear bit.
+ mask ^= (1U << bit);
+ aRun->mRegionsMask[i] = mask;
+
+ return ret;
+ }
+
+ for (i++; i < aBin->mRunNumRegionsMask; i++) {
+ mask = aRun->mRegionsMask[i];
+ if (mask != 0) {
+ bit = FindFreeBitInMask(mask, rndPos);
+
+ regind = ((i << (LOG2(sizeof(int)) + 3)) + bit);
+ MOZ_ASSERT(regind < aBin->mRunNumRegions);
+ ret = (void*)(((uintptr_t)aRun) + aBin->mRunFirstRegionOffset +
+ (aBin->mSizeClass * regind));
+
+ // Clear bit.
+ mask ^= (1U << bit);
+ aRun->mRegionsMask[i] = mask;
+
+ // Make a note that nothing before this element
+ // contains a free region.
+ aRun->mRegionsMinElement = i; // Low payoff: + (mask == 0);
+
+ return ret;
+ }
+ }
+ // Not reached.
+ MOZ_DIAGNOSTIC_ASSERT(0);
+ return nullptr;
+}
+
+static inline void arena_run_reg_dalloc(arena_run_t* run, arena_bin_t* bin,
+ void* ptr, size_t size) {
+ uint32_t diff, regind;
+ unsigned elm, bit;
+
+ MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC);
+
+ // Avoid doing division with a variable divisor if possible. Using
+ // actual division here can reduce allocator throughput by over 20%!
+ diff =
+ (uint32_t)((uintptr_t)ptr - (uintptr_t)run - bin->mRunFirstRegionOffset);
+
+ MOZ_ASSERT(diff <=
+ (static_cast<unsigned>(bin->mRunSizePages) << gPageSize2Pow));
+ regind = diff / bin->mSizeDivisor;
+
+ MOZ_DIAGNOSTIC_ASSERT(diff == regind * size);
+ MOZ_DIAGNOSTIC_ASSERT(regind < bin->mRunNumRegions);
+
+ elm = regind >> (LOG2(sizeof(int)) + 3);
+ if (elm < run->mRegionsMinElement) {
+ run->mRegionsMinElement = elm;
+ }
+ bit = regind - (elm << (LOG2(sizeof(int)) + 3));
+ MOZ_RELEASE_ASSERT((run->mRegionsMask[elm] & (1U << bit)) == 0,
+ "Double-free?");
+ run->mRegionsMask[elm] |= (1U << bit);
+}
+
+bool arena_t::SplitRun(arena_run_t* aRun, size_t aSize, bool aLarge,
+ bool aZero) {
+ arena_chunk_t* chunk;
+ size_t old_ndirty, run_ind, total_pages, need_pages, rem_pages, i;
+
+ chunk = GetChunkForPtr(aRun);
+ old_ndirty = chunk->ndirty;
+ run_ind = (unsigned)((uintptr_t(aRun) - uintptr_t(chunk)) >> gPageSize2Pow);
+ total_pages = (chunk->map[run_ind].bits & ~gPageSizeMask) >> gPageSize2Pow;
+ need_pages = (aSize >> gPageSize2Pow);
+ MOZ_ASSERT(need_pages > 0);
+ MOZ_ASSERT(need_pages <= total_pages);
+ rem_pages = total_pages - need_pages;
+
+ for (i = 0; i < need_pages; i++) {
+ // Commit decommitted pages if necessary. If a decommitted
+ // page is encountered, commit all needed adjacent decommitted
+ // pages in one operation, in order to reduce system call
+ // overhead.
+ if (chunk->map[run_ind + i].bits & CHUNK_MAP_MADVISED_OR_DECOMMITTED) {
+ size_t j;
+
+ // Advance i+j to just past the index of the last page
+ // to commit. Clear CHUNK_MAP_DECOMMITTED and
+ // CHUNK_MAP_MADVISED along the way.
+ for (j = 0; i + j < need_pages && (chunk->map[run_ind + i + j].bits &
+ CHUNK_MAP_MADVISED_OR_DECOMMITTED);
+ j++) {
+ // DECOMMITTED and MADVISED are mutually exclusive.
+ MOZ_ASSERT(!(chunk->map[run_ind + i + j].bits & CHUNK_MAP_DECOMMITTED &&
+ chunk->map[run_ind + i + j].bits & CHUNK_MAP_MADVISED));
+
+ chunk->map[run_ind + i + j].bits &= ~CHUNK_MAP_MADVISED_OR_DECOMMITTED;
+ }
+
+#ifdef MALLOC_DECOMMIT
+ bool committed = pages_commit(
+ (void*)(uintptr_t(chunk) + ((run_ind + i) << gPageSize2Pow)),
+ j << gPageSize2Pow);
+ // pages_commit zeroes pages, so mark them as such if it succeeded.
+ // That's checked further below to avoid manually zeroing the pages.
+ for (size_t k = 0; k < j; k++) {
+ chunk->map[run_ind + i + k].bits |=
+ committed ? CHUNK_MAP_ZEROED : CHUNK_MAP_DECOMMITTED;
+ }
+ if (!committed) {
+ return false;
+ }
+#endif
+
+ mStats.committed += j;
+ }
+ }
+
+ mRunsAvail.Remove(&chunk->map[run_ind]);
+
+ // Keep track of trailing unused pages for later use.
+ if (rem_pages > 0) {
+ chunk->map[run_ind + need_pages].bits =
+ (rem_pages << gPageSize2Pow) |
+ (chunk->map[run_ind + need_pages].bits & gPageSizeMask);
+ chunk->map[run_ind + total_pages - 1].bits =
+ (rem_pages << gPageSize2Pow) |
+ (chunk->map[run_ind + total_pages - 1].bits & gPageSizeMask);
+ mRunsAvail.Insert(&chunk->map[run_ind + need_pages]);
+ }
+
+ for (i = 0; i < need_pages; i++) {
+ // Zero if necessary.
+ if (aZero) {
+ if ((chunk->map[run_ind + i].bits & CHUNK_MAP_ZEROED) == 0) {
+ memset((void*)(uintptr_t(chunk) + ((run_ind + i) << gPageSize2Pow)), 0,
+ gPageSize);
+ // CHUNK_MAP_ZEROED is cleared below.
+ }
+ }
+
+ // Update dirty page accounting.
+ if (chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY) {
+ chunk->ndirty--;
+ mNumDirty--;
+ // CHUNK_MAP_DIRTY is cleared below.
+ }
+
+ // Initialize the chunk map.
+ if (aLarge) {
+ chunk->map[run_ind + i].bits = CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
+ } else {
+ chunk->map[run_ind + i].bits = size_t(aRun) | CHUNK_MAP_ALLOCATED;
+ }
+ }
+
+ // Set the run size only in the first element for large runs. This is
+ // primarily a debugging aid, since the lack of size info for trailing
+ // pages only matters if the application tries to operate on an
+ // interior pointer.
+ if (aLarge) {
+ chunk->map[run_ind].bits |= aSize;
+ }
+
+ if (chunk->ndirty == 0 && old_ndirty > 0) {
+ mChunksDirty.Remove(chunk);
+ }
+ return true;
+}
+
+void arena_t::InitChunk(arena_chunk_t* aChunk, bool aZeroed) {
+ size_t i;
+ // WARNING: The following relies on !aZeroed meaning "used to be an arena
+ // chunk".
+ // When the chunk we're initializating as an arena chunk is zeroed, we
+ // mark all runs are decommitted and zeroed.
+ // When it is not, which we can assume means it's a recycled arena chunk,
+ // all it can contain is an arena chunk header (which we're overwriting),
+ // and zeroed or poisoned memory (because a recycled arena chunk will
+ // have been emptied before being recycled). In that case, we can get
+ // away with reusing the chunk as-is, marking all runs as madvised.
+
+ size_t flags =
+ aZeroed ? CHUNK_MAP_DECOMMITTED | CHUNK_MAP_ZEROED : CHUNK_MAP_MADVISED;
+
+ mStats.mapped += kChunkSize;
+
+ aChunk->arena = this;
+
+ // Claim that no pages are in use, since the header is merely overhead.
+ aChunk->ndirty = 0;
+
+ // Initialize the map to contain one maximal free untouched run.
+ arena_run_t* run = (arena_run_t*)(uintptr_t(aChunk) +
+ (gChunkHeaderNumPages << gPageSize2Pow));
+
+ // Clear the bits for the real header pages.
+ for (i = 0; i < gChunkHeaderNumPages - 1; i++) {
+ aChunk->map[i].bits = 0;
+ }
+ // Mark the leading guard page (last header page) as decommitted.
+ aChunk->map[i++].bits = CHUNK_MAP_DECOMMITTED;
+
+ // Mark the area usable for runs as available, note size at start and end
+ aChunk->map[i++].bits = gMaxLargeClass | flags;
+ for (; i < gChunkNumPages - 2; i++) {
+ aChunk->map[i].bits = flags;
+ }
+ aChunk->map[gChunkNumPages - 2].bits = gMaxLargeClass | flags;
+
+ // Mark the trailing guard page as decommitted.
+ aChunk->map[gChunkNumPages - 1].bits = CHUNK_MAP_DECOMMITTED;
+
+#ifdef MALLOC_DECOMMIT
+ // Start out decommitted, in order to force a closer correspondence
+ // between dirty pages and committed untouched pages. This includes
+ // leading and trailing guard pages.
+ pages_decommit((void*)(uintptr_t(run) - gPageSize),
+ gMaxLargeClass + 2 * gPageSize);
+#else
+ // Decommit the last header page (=leading page) as a guard.
+ pages_decommit((void*)(uintptr_t(run) - gPageSize), gPageSize);
+ // Decommit the last page as a guard.
+ pages_decommit((void*)(uintptr_t(aChunk) + kChunkSize - gPageSize),
+ gPageSize);
+#endif
+
+ mStats.committed += gChunkHeaderNumPages;
+
+ // Insert the run into the tree of available runs.
+ mRunsAvail.Insert(&aChunk->map[gChunkHeaderNumPages]);
+
+#ifdef MALLOC_DOUBLE_PURGE
+ new (&aChunk->chunks_madvised_elem) DoublyLinkedListElement<arena_chunk_t>();
+#endif
+}
+
+arena_chunk_t* arena_t::DeallocChunk(arena_chunk_t* aChunk) {
+ if (mSpare) {
+ if (mSpare->ndirty > 0) {
+ aChunk->arena->mChunksDirty.Remove(mSpare);
+ mNumDirty -= mSpare->ndirty;
+ mStats.committed -= mSpare->ndirty;
+ }
+
+#ifdef MALLOC_DOUBLE_PURGE
+ if (mChunksMAdvised.ElementProbablyInList(mSpare)) {
+ mChunksMAdvised.remove(mSpare);
+ }
+#endif
+
+ mStats.mapped -= kChunkSize;
+ mStats.committed -= gChunkHeaderNumPages;
+ }
+
+ // Remove run from the tree of available runs, so that the arena does not use
+ // it. Dirty page flushing only uses the tree of dirty chunks, so leaving this
+ // chunk in the chunks_* trees is sufficient for that purpose.
+ mRunsAvail.Remove(&aChunk->map[gChunkHeaderNumPages]);
+
+ arena_chunk_t* chunk_dealloc = mSpare;
+ mSpare = aChunk;
+ return chunk_dealloc;
+}
+
+arena_run_t* arena_t::AllocRun(size_t aSize, bool aLarge, bool aZero) {
+ arena_run_t* run;
+ arena_chunk_map_t* mapelm;
+ arena_chunk_map_t key;
+
+ MOZ_ASSERT(aSize <= gMaxLargeClass);
+ MOZ_ASSERT((aSize & gPageSizeMask) == 0);
+
+ // Search the arena's chunks for the lowest best fit.
+ key.bits = aSize | CHUNK_MAP_KEY;
+ mapelm = mRunsAvail.SearchOrNext(&key);
+ if (mapelm) {
+ arena_chunk_t* chunk = GetChunkForPtr(mapelm);
+ size_t pageind =
+ (uintptr_t(mapelm) - uintptr_t(chunk->map)) / sizeof(arena_chunk_map_t);
+
+ run = (arena_run_t*)(uintptr_t(chunk) + (pageind << gPageSize2Pow));
+ } else if (mSpare) {
+ // Use the spare.
+ arena_chunk_t* chunk = mSpare;
+ mSpare = nullptr;
+ run = (arena_run_t*)(uintptr_t(chunk) +
+ (gChunkHeaderNumPages << gPageSize2Pow));
+ // Insert the run into the tree of available runs.
+ mRunsAvail.Insert(&chunk->map[gChunkHeaderNumPages]);
+ } else {
+ // No usable runs. Create a new chunk from which to allocate
+ // the run.
+ bool zeroed;
+ arena_chunk_t* chunk =
+ (arena_chunk_t*)chunk_alloc(kChunkSize, kChunkSize, false, &zeroed);
+ if (!chunk) {
+ return nullptr;
+ }
+
+ InitChunk(chunk, zeroed);
+ run = (arena_run_t*)(uintptr_t(chunk) +
+ (gChunkHeaderNumPages << gPageSize2Pow));
+ }
+ // Update page map.
+ return SplitRun(run, aSize, aLarge, aZero) ? run : nullptr;
+}
+
+size_t arena_t::EffectiveMaxDirty() {
+ int32_t modifier = gArenas.DefaultMaxDirtyPageModifier();
+ if (modifier) {
+ int32_t arenaOverride =
+ modifier > 0 ? mMaxDirtyIncreaseOverride : mMaxDirtyDecreaseOverride;
+ if (arenaOverride) {
+ modifier = arenaOverride;
+ }
+ }
+
+ return modifier >= 0 ? mMaxDirty << modifier : mMaxDirty >> -modifier;
+}
+
+void arena_t::Purge(size_t aMaxDirty) {
+ arena_chunk_t* chunk;
+ size_t i, npages;
+
+#ifdef MOZ_DEBUG
+ size_t ndirty = 0;
+ for (auto chunk : mChunksDirty.iter()) {
+ ndirty += chunk->ndirty;
+ }
+ MOZ_ASSERT(ndirty == mNumDirty);
+#endif
+ MOZ_DIAGNOSTIC_ASSERT(aMaxDirty == 1 || (mNumDirty > aMaxDirty));
+
+ // Iterate downward through chunks until enough dirty memory has been
+ // purged. Terminate as soon as possible in order to minimize the
+ // number of system calls, even if a chunk has only been partially
+ // purged.
+ while (mNumDirty > (aMaxDirty >> 1)) {
+#ifdef MALLOC_DOUBLE_PURGE
+ bool madvised = false;
+#endif
+ chunk = mChunksDirty.Last();
+ MOZ_DIAGNOSTIC_ASSERT(chunk);
+ // Last page is DECOMMITTED as a guard page.
+ MOZ_ASSERT((chunk->map[gChunkNumPages - 1].bits & CHUNK_MAP_DECOMMITTED) !=
+ 0);
+ for (i = gChunkNumPages - 2; chunk->ndirty > 0; i--) {
+ MOZ_DIAGNOSTIC_ASSERT(i >= gChunkHeaderNumPages);
+
+ if (chunk->map[i].bits & CHUNK_MAP_DIRTY) {
+#ifdef MALLOC_DECOMMIT
+ const size_t free_operation = CHUNK_MAP_DECOMMITTED;
+#else
+ const size_t free_operation = CHUNK_MAP_MADVISED;
+#endif
+ MOZ_ASSERT((chunk->map[i].bits & CHUNK_MAP_MADVISED_OR_DECOMMITTED) ==
+ 0);
+ chunk->map[i].bits ^= free_operation | CHUNK_MAP_DIRTY;
+ // Find adjacent dirty run(s).
+ for (npages = 1; i > gChunkHeaderNumPages &&
+ (chunk->map[i - 1].bits & CHUNK_MAP_DIRTY);
+ npages++) {
+ i--;
+ MOZ_ASSERT((chunk->map[i].bits & CHUNK_MAP_MADVISED_OR_DECOMMITTED) ==
+ 0);
+ chunk->map[i].bits ^= free_operation | CHUNK_MAP_DIRTY;
+ }
+ chunk->ndirty -= npages;
+ mNumDirty -= npages;
+
+#ifdef MALLOC_DECOMMIT
+ pages_decommit((void*)(uintptr_t(chunk) + (i << gPageSize2Pow)),
+ (npages << gPageSize2Pow));
+#endif
+ mStats.committed -= npages;
+
+#ifndef MALLOC_DECOMMIT
+# ifdef XP_SOLARIS
+ posix_madvise((void*)(uintptr_t(chunk) + (i << gPageSize2Pow)),
+ (npages << gPageSize2Pow), MADV_FREE);
+# else
+ madvise((void*)(uintptr_t(chunk) + (i << gPageSize2Pow)),
+ (npages << gPageSize2Pow), MADV_FREE);
+# endif
+# ifdef MALLOC_DOUBLE_PURGE
+ madvised = true;
+# endif
+#endif
+ if (mNumDirty <= (aMaxDirty >> 1)) {
+ break;
+ }
+ }
+ }
+
+ if (chunk->ndirty == 0) {
+ mChunksDirty.Remove(chunk);
+ }
+#ifdef MALLOC_DOUBLE_PURGE
+ if (madvised) {
+ // The chunk might already be in the list, but this
+ // makes sure it's at the front.
+ if (mChunksMAdvised.ElementProbablyInList(chunk)) {
+ mChunksMAdvised.remove(chunk);
+ }
+ mChunksMAdvised.pushFront(chunk);
+ }
+#endif
+ }
+}
+
+arena_chunk_t* arena_t::DallocRun(arena_run_t* aRun, bool aDirty) {
+ arena_chunk_t* chunk;
+ size_t size, run_ind, run_pages;
+
+ chunk = GetChunkForPtr(aRun);
+ run_ind = (size_t)((uintptr_t(aRun) - uintptr_t(chunk)) >> gPageSize2Pow);
+ MOZ_DIAGNOSTIC_ASSERT(run_ind >= gChunkHeaderNumPages);
+ MOZ_RELEASE_ASSERT(run_ind < gChunkNumPages - 1);
+ if ((chunk->map[run_ind].bits & CHUNK_MAP_LARGE) != 0) {
+ size = chunk->map[run_ind].bits & ~gPageSizeMask;
+ run_pages = (size >> gPageSize2Pow);
+ } else {
+ run_pages = aRun->mBin->mRunSizePages;
+ size = run_pages << gPageSize2Pow;
+ }
+
+ // Mark pages as unallocated in the chunk map.
+ if (aDirty) {
+ size_t i;
+
+ for (i = 0; i < run_pages; i++) {
+ MOZ_DIAGNOSTIC_ASSERT((chunk->map[run_ind + i].bits & CHUNK_MAP_DIRTY) ==
+ 0);
+ chunk->map[run_ind + i].bits = CHUNK_MAP_DIRTY;
+ }
+
+ if (chunk->ndirty == 0) {
+ mChunksDirty.Insert(chunk);
+ }
+ chunk->ndirty += run_pages;
+ mNumDirty += run_pages;
+ } else {
+ size_t i;
+
+ for (i = 0; i < run_pages; i++) {
+ chunk->map[run_ind + i].bits &= ~(CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED);
+ }
+ }
+ chunk->map[run_ind].bits = size | (chunk->map[run_ind].bits & gPageSizeMask);
+ chunk->map[run_ind + run_pages - 1].bits =
+ size | (chunk->map[run_ind + run_pages - 1].bits & gPageSizeMask);
+
+ // Try to coalesce forward.
+ if (run_ind + run_pages < gChunkNumPages - 1 &&
+ (chunk->map[run_ind + run_pages].bits & CHUNK_MAP_ALLOCATED) == 0) {
+ size_t nrun_size = chunk->map[run_ind + run_pages].bits & ~gPageSizeMask;
+
+ // Remove successor from tree of available runs; the coalesced run is
+ // inserted later.
+ mRunsAvail.Remove(&chunk->map[run_ind + run_pages]);
+
+ size += nrun_size;
+ run_pages = size >> gPageSize2Pow;
+
+ MOZ_DIAGNOSTIC_ASSERT((chunk->map[run_ind + run_pages - 1].bits &
+ ~gPageSizeMask) == nrun_size);
+ chunk->map[run_ind].bits =
+ size | (chunk->map[run_ind].bits & gPageSizeMask);
+ chunk->map[run_ind + run_pages - 1].bits =
+ size | (chunk->map[run_ind + run_pages - 1].bits & gPageSizeMask);
+ }
+
+ // Try to coalesce backward.
+ if (run_ind > gChunkHeaderNumPages &&
+ (chunk->map[run_ind - 1].bits & CHUNK_MAP_ALLOCATED) == 0) {
+ size_t prun_size = chunk->map[run_ind - 1].bits & ~gPageSizeMask;
+
+ run_ind -= prun_size >> gPageSize2Pow;
+
+ // Remove predecessor from tree of available runs; the coalesced run is
+ // inserted later.
+ mRunsAvail.Remove(&chunk->map[run_ind]);
+
+ size += prun_size;
+ run_pages = size >> gPageSize2Pow;
+
+ MOZ_DIAGNOSTIC_ASSERT((chunk->map[run_ind].bits & ~gPageSizeMask) ==
+ prun_size);
+ chunk->map[run_ind].bits =
+ size | (chunk->map[run_ind].bits & gPageSizeMask);
+ chunk->map[run_ind + run_pages - 1].bits =
+ size | (chunk->map[run_ind + run_pages - 1].bits & gPageSizeMask);
+ }
+
+ // Insert into tree of available runs, now that coalescing is complete.
+ mRunsAvail.Insert(&chunk->map[run_ind]);
+
+ // Deallocate chunk if it is now completely unused.
+ arena_chunk_t* chunk_dealloc = nullptr;
+ if ((chunk->map[gChunkHeaderNumPages].bits &
+ (~gPageSizeMask | CHUNK_MAP_ALLOCATED)) == gMaxLargeClass) {
+ chunk_dealloc = DeallocChunk(chunk);
+ }
+
+ size_t maxDirty = EffectiveMaxDirty();
+ if (mNumDirty > maxDirty) {
+ Purge(maxDirty);
+ }
+
+ return chunk_dealloc;
+}
+
+void arena_t::TrimRunHead(arena_chunk_t* aChunk, arena_run_t* aRun,
+ size_t aOldSize, size_t aNewSize) {
+ size_t pageind = (uintptr_t(aRun) - uintptr_t(aChunk)) >> gPageSize2Pow;
+ size_t head_npages = (aOldSize - aNewSize) >> gPageSize2Pow;
+
+ MOZ_ASSERT(aOldSize > aNewSize);
+
+ // Update the chunk map so that arena_t::RunDalloc() can treat the
+ // leading run as separately allocated.
+ aChunk->map[pageind].bits =
+ (aOldSize - aNewSize) | CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
+ aChunk->map[pageind + head_npages].bits =
+ aNewSize | CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
+
+#ifdef MOZ_DEBUG
+ arena_chunk_t* no_chunk =
+#endif
+ DallocRun(aRun, false);
+ // This will never release a chunk as there's still at least one allocated
+ // run.
+ MOZ_ASSERT(!no_chunk);
+}
+
+void arena_t::TrimRunTail(arena_chunk_t* aChunk, arena_run_t* aRun,
+ size_t aOldSize, size_t aNewSize, bool aDirty) {
+ size_t pageind = (uintptr_t(aRun) - uintptr_t(aChunk)) >> gPageSize2Pow;
+ size_t npages = aNewSize >> gPageSize2Pow;
+
+ MOZ_ASSERT(aOldSize > aNewSize);
+
+ // Update the chunk map so that arena_t::RunDalloc() can treat the
+ // trailing run as separately allocated.
+ aChunk->map[pageind].bits = aNewSize | CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
+ aChunk->map[pageind + npages].bits =
+ (aOldSize - aNewSize) | CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
+
+#ifdef MOZ_DEBUG
+ arena_chunk_t* no_chunk =
+#endif
+ DallocRun((arena_run_t*)(uintptr_t(aRun) + aNewSize), aDirty);
+
+ // This will never release a chunk as there's still at least one allocated
+ // run.
+ MOZ_ASSERT(!no_chunk);
+}
+
+arena_run_t* arena_t::GetNonFullBinRun(arena_bin_t* aBin) {
+ arena_chunk_map_t* mapelm;
+ arena_run_t* run;
+ unsigned i, remainder;
+
+ // Look for a usable run.
+ mapelm = aBin->mNonFullRuns.First();
+ if (mapelm) {
+ // run is guaranteed to have available space.
+ aBin->mNonFullRuns.Remove(mapelm);
+ run = (arena_run_t*)(mapelm->bits & ~gPageSizeMask);
+ return run;
+ }
+ // No existing runs have any space available.
+
+ // Allocate a new run.
+ run = AllocRun(static_cast<size_t>(aBin->mRunSizePages) << gPageSize2Pow,
+ false, false);
+ if (!run) {
+ return nullptr;
+ }
+ // Don't initialize if a race in arena_t::RunAlloc() allowed an existing
+ // run to become usable.
+ if (run == aBin->mCurrentRun) {
+ return run;
+ }
+
+ // Initialize run internals.
+ run->mBin = aBin;
+
+ for (i = 0; i < aBin->mRunNumRegionsMask - 1; i++) {
+ run->mRegionsMask[i] = UINT_MAX;
+ }
+ remainder = aBin->mRunNumRegions & ((1U << (LOG2(sizeof(int)) + 3)) - 1);
+ if (remainder == 0) {
+ run->mRegionsMask[i] = UINT_MAX;
+ } else {
+ // The last element has spare bits that need to be unset.
+ run->mRegionsMask[i] =
+ (UINT_MAX >> ((1U << (LOG2(sizeof(int)) + 3)) - remainder));
+ }
+
+ run->mRegionsMinElement = 0;
+
+ run->mNumFree = aBin->mRunNumRegions;
+#if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
+ run->mMagic = ARENA_RUN_MAGIC;
+#endif
+
+ aBin->mNumRuns++;
+ return run;
+}
+
+void arena_bin_t::Init(SizeClass aSizeClass) {
+ size_t try_run_size;
+ unsigned try_nregs, try_mask_nelms, try_reg0_offset;
+ // Size of the run header, excluding mRegionsMask.
+ static const size_t kFixedHeaderSize = offsetof(arena_run_t, mRegionsMask);
+
+ MOZ_ASSERT(aSizeClass.Size() <= gMaxBinClass);
+
+ try_run_size = gPageSize;
+
+ mCurrentRun = nullptr;
+ mNonFullRuns.Init();
+ mSizeClass = aSizeClass.Size();
+ mNumRuns = 0;
+
+ // Run size expansion loop.
+ while (true) {
+ try_nregs = ((try_run_size - kFixedHeaderSize) / mSizeClass) +
+ 1; // Counter-act try_nregs-- in loop.
+
+ // The do..while loop iteratively reduces the number of regions until
+ // the run header and the regions no longer overlap. A closed formula
+ // would be quite messy, since there is an interdependency between the
+ // header's mask length and the number of regions.
+ do {
+ try_nregs--;
+ try_mask_nelms =
+ (try_nregs >> (LOG2(sizeof(int)) + 3)) +
+ ((try_nregs & ((1U << (LOG2(sizeof(int)) + 3)) - 1)) ? 1 : 0);
+ try_reg0_offset = try_run_size - (try_nregs * mSizeClass);
+ } while (kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) >
+ try_reg0_offset);
+
+ // Try to keep the run overhead below kRunOverhead.
+ if (Fraction(try_reg0_offset, try_run_size) <= kRunOverhead) {
+ break;
+ }
+
+ // If the overhead is larger than the size class, it means the size class
+ // is small and doesn't align very well with the header. It's desirable to
+ // have smaller run sizes for them, so relax the overhead requirement.
+ if (try_reg0_offset > mSizeClass) {
+ if (Fraction(try_reg0_offset, try_run_size) <= kRunRelaxedOverhead) {
+ break;
+ }
+ }
+
+ // The run header includes one bit per region of the given size. For sizes
+ // small enough, the number of regions is large enough that growing the run
+ // size barely moves the needle for the overhead because of all those bits.
+ // For example, for a size of 8 bytes, adding 4KiB to the run size adds
+ // close to 512 bits to the header, which is 64 bytes.
+ // With such overhead, there is no way to get to the wanted overhead above,
+ // so we give up if the required size for mRegionsMask more than doubles the
+ // size of the run header.
+ if (try_mask_nelms * sizeof(unsigned) >= kFixedHeaderSize) {
+ break;
+ }
+
+ // If next iteration is going to be larger than the largest possible large
+ // size class, then we didn't find a setup where the overhead is small
+ // enough, and we can't do better than the current settings, so just use
+ // that.
+ if (try_run_size + gPageSize > gMaxLargeClass) {
+ break;
+ }
+
+ // Try more aggressive settings.
+ try_run_size += gPageSize;
+ }
+
+ MOZ_ASSERT(kFixedHeaderSize + (sizeof(unsigned) * try_mask_nelms) <=
+ try_reg0_offset);
+ MOZ_ASSERT((try_mask_nelms << (LOG2(sizeof(int)) + 3)) >= try_nregs);
+
+ // Copy final settings.
+ MOZ_ASSERT((try_run_size >> gPageSize2Pow) <= UINT8_MAX);
+ mRunSizePages = static_cast<uint8_t>(try_run_size >> gPageSize2Pow);
+ mRunNumRegions = try_nregs;
+ mRunNumRegionsMask = try_mask_nelms;
+ mRunFirstRegionOffset = try_reg0_offset;
+ mSizeDivisor = FastDivisor<uint16_t>(aSizeClass.Size(), try_run_size);
+}
+
+void* arena_t::MallocSmall(size_t aSize, bool aZero) {
+ void* ret;
+ arena_bin_t* bin;
+ arena_run_t* run;
+ SizeClass sizeClass(aSize);
+ aSize = sizeClass.Size();
+
+ switch (sizeClass.Type()) {
+ case SizeClass::Tiny:
+ bin = &mBins[FloorLog2(aSize / kMinTinyClass)];
+ break;
+ case SizeClass::Quantum:
+ // Although we divide 2 things by kQuantum, the compiler will
+ // reduce `kMinQuantumClass / kQuantum` and `kNumTinyClasses` to a
+ // single constant.
+ bin = &mBins[kNumTinyClasses + (aSize / kQuantum) -
+ (kMinQuantumClass / kQuantum)];
+ break;
+ case SizeClass::QuantumWide:
+ bin =
+ &mBins[kNumTinyClasses + kNumQuantumClasses + (aSize / kQuantumWide) -
+ (kMinQuantumWideClass / kQuantumWide)];
+ break;
+ case SizeClass::SubPage:
+ bin =
+ &mBins[kNumTinyClasses + kNumQuantumClasses + kNumQuantumWideClasses +
+ (FloorLog2(aSize) - LOG2(kMinSubPageClass))];
+ break;
+ default:
+ MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected size class type");
+ }
+ MOZ_DIAGNOSTIC_ASSERT(aSize == bin->mSizeClass);
+
+ {
+ // Before we lock, we determine if we need to randomize the allocation
+ // because if we do, we need to create the PRNG which might require
+ // allocating memory (arc4random on OSX for example) and we need to
+ // avoid the deadlock
+ if (MOZ_UNLIKELY(mRandomizeSmallAllocations && mPRNG == nullptr)) {
+ // This is frustrating. Because the code backing RandomUint64 (arc4random
+ // for example) may allocate memory, and because
+ // mRandomizeSmallAllocations is true and we haven't yet initilized mPRNG,
+ // we would re-enter this same case and cause a deadlock inside e.g.
+ // arc4random. So we temporarily disable mRandomizeSmallAllocations to
+ // skip this case and then re-enable it
+ mRandomizeSmallAllocations = false;
+ mozilla::Maybe<uint64_t> prngState1 = mozilla::RandomUint64();
+ mozilla::Maybe<uint64_t> prngState2 = mozilla::RandomUint64();
+ void* backing =
+ base_alloc(sizeof(mozilla::non_crypto::XorShift128PlusRNG));
+ mPRNG = new (backing) mozilla::non_crypto::XorShift128PlusRNG(
+ prngState1.valueOr(0), prngState2.valueOr(0));
+ mRandomizeSmallAllocations = true;
+ }
+ MOZ_ASSERT(!mRandomizeSmallAllocations || mPRNG);
+
+ MutexAutoLock lock(mLock);
+ run = bin->mCurrentRun;
+ if (MOZ_UNLIKELY(!run || run->mNumFree == 0)) {
+ run = bin->mCurrentRun = GetNonFullBinRun(bin);
+ }
+ if (MOZ_UNLIKELY(!run)) {
+ return nullptr;
+ }
+ MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC);
+ MOZ_DIAGNOSTIC_ASSERT(run->mNumFree > 0);
+ ret = ArenaRunRegAlloc(run, bin);
+ MOZ_DIAGNOSTIC_ASSERT(ret);
+ run->mNumFree--;
+ if (!ret) {
+ return nullptr;
+ }
+
+ mStats.allocated_small += aSize;
+ }
+
+ if (!aZero) {
+ ApplyZeroOrJunk(ret, aSize);
+ } else {
+ memset(ret, 0, aSize);
+ }
+
+ return ret;
+}
+
+void* arena_t::MallocLarge(size_t aSize, bool aZero) {
+ void* ret;
+
+ // Large allocation.
+ aSize = PAGE_CEILING(aSize);
+
+ {
+ MutexAutoLock lock(mLock);
+ ret = AllocRun(aSize, true, aZero);
+ if (!ret) {
+ return nullptr;
+ }
+ mStats.allocated_large += aSize;
+ }
+
+ if (!aZero) {
+ ApplyZeroOrJunk(ret, aSize);
+ }
+
+ return ret;
+}
+
+void* arena_t::Malloc(size_t aSize, bool aZero) {
+ MOZ_DIAGNOSTIC_ASSERT(mMagic == ARENA_MAGIC);
+ MOZ_ASSERT(aSize != 0);
+
+ if (aSize <= gMaxBinClass) {
+ return MallocSmall(aSize, aZero);
+ }
+ if (aSize <= gMaxLargeClass) {
+ return MallocLarge(aSize, aZero);
+ }
+ return MallocHuge(aSize, aZero);
+}
+
+// Only handles large allocations that require more than page alignment.
+void* arena_t::PallocLarge(size_t aAlignment, size_t aSize, size_t aAllocSize) {
+ void* ret;
+ size_t offset;
+ arena_chunk_t* chunk;
+
+ MOZ_ASSERT((aSize & gPageSizeMask) == 0);
+ MOZ_ASSERT((aAlignment & gPageSizeMask) == 0);
+
+ {
+ MutexAutoLock lock(mLock);
+ ret = AllocRun(aAllocSize, true, false);
+ if (!ret) {
+ return nullptr;
+ }
+
+ chunk = GetChunkForPtr(ret);
+
+ offset = uintptr_t(ret) & (aAlignment - 1);
+ MOZ_ASSERT((offset & gPageSizeMask) == 0);
+ MOZ_ASSERT(offset < aAllocSize);
+ if (offset == 0) {
+ TrimRunTail(chunk, (arena_run_t*)ret, aAllocSize, aSize, false);
+ } else {
+ size_t leadsize, trailsize;
+
+ leadsize = aAlignment - offset;
+ if (leadsize > 0) {
+ TrimRunHead(chunk, (arena_run_t*)ret, aAllocSize,
+ aAllocSize - leadsize);
+ ret = (void*)(uintptr_t(ret) + leadsize);
+ }
+
+ trailsize = aAllocSize - leadsize - aSize;
+ if (trailsize != 0) {
+ // Trim trailing space.
+ MOZ_ASSERT(trailsize < aAllocSize);
+ TrimRunTail(chunk, (arena_run_t*)ret, aSize + trailsize, aSize, false);
+ }
+ }
+
+ mStats.allocated_large += aSize;
+ }
+
+ ApplyZeroOrJunk(ret, aSize);
+ return ret;
+}
+
+void* arena_t::Palloc(size_t aAlignment, size_t aSize) {
+ void* ret;
+ size_t ceil_size;
+
+ // Round size up to the nearest multiple of alignment.
+ //
+ // This done, we can take advantage of the fact that for each small
+ // size class, every object is aligned at the smallest power of two
+ // that is non-zero in the base two representation of the size. For
+ // example:
+ //
+ // Size | Base 2 | Minimum alignment
+ // -----+----------+------------------
+ // 96 | 1100000 | 32
+ // 144 | 10100000 | 32
+ // 192 | 11000000 | 64
+ //
+ // Depending on runtime settings, it is possible that arena_malloc()
+ // will further round up to a power of two, but that never causes
+ // correctness issues.
+ ceil_size = ALIGNMENT_CEILING(aSize, aAlignment);
+
+ // (ceil_size < aSize) protects against the combination of maximal
+ // alignment and size greater than maximal alignment.
+ if (ceil_size < aSize) {
+ // size_t overflow.
+ return nullptr;
+ }
+
+ if (ceil_size <= gPageSize ||
+ (aAlignment <= gPageSize && ceil_size <= gMaxLargeClass)) {
+ ret = Malloc(ceil_size, false);
+ } else {
+ size_t run_size;
+
+ // We can't achieve sub-page alignment, so round up alignment
+ // permanently; it makes later calculations simpler.
+ aAlignment = PAGE_CEILING(aAlignment);
+ ceil_size = PAGE_CEILING(aSize);
+
+ // (ceil_size < aSize) protects against very large sizes within
+ // pagesize of SIZE_T_MAX.
+ //
+ // (ceil_size + aAlignment < ceil_size) protects against the
+ // combination of maximal alignment and ceil_size large enough
+ // to cause overflow. This is similar to the first overflow
+ // check above, but it needs to be repeated due to the new
+ // ceil_size value, which may now be *equal* to maximal
+ // alignment, whereas before we only detected overflow if the
+ // original size was *greater* than maximal alignment.
+ if (ceil_size < aSize || ceil_size + aAlignment < ceil_size) {
+ // size_t overflow.
+ return nullptr;
+ }
+
+ // Calculate the size of the over-size run that arena_palloc()
+ // would need to allocate in order to guarantee the alignment.
+ if (ceil_size >= aAlignment) {
+ run_size = ceil_size + aAlignment - gPageSize;
+ } else {
+ // It is possible that (aAlignment << 1) will cause
+ // overflow, but it doesn't matter because we also
+ // subtract pagesize, which in the case of overflow
+ // leaves us with a very large run_size. That causes
+ // the first conditional below to fail, which means
+ // that the bogus run_size value never gets used for
+ // anything important.
+ run_size = (aAlignment << 1) - gPageSize;
+ }
+
+ if (run_size <= gMaxLargeClass) {
+ ret = PallocLarge(aAlignment, ceil_size, run_size);
+ } else if (aAlignment <= kChunkSize) {
+ ret = MallocHuge(ceil_size, false);
+ } else {
+ ret = PallocHuge(ceil_size, aAlignment, false);
+ }
+ }
+
+ MOZ_ASSERT((uintptr_t(ret) & (aAlignment - 1)) == 0);
+ return ret;
+}
+
+class AllocInfo {
+ public:
+ template <bool Validate = false>
+ static inline AllocInfo Get(const void* aPtr) {
+ // If the allocator is not initialized, the pointer can't belong to it.
+ if (Validate && malloc_initialized == false) {
+ return AllocInfo();
+ }
+
+ auto chunk = GetChunkForPtr(aPtr);
+ if (Validate) {
+ if (!chunk || !gChunkRTree.Get(chunk)) {
+ return AllocInfo();
+ }
+ }
+
+ if (chunk != aPtr) {
+ MOZ_DIAGNOSTIC_ASSERT(chunk->arena->mMagic == ARENA_MAGIC);
+ size_t pageind = (((uintptr_t)aPtr - (uintptr_t)chunk) >> gPageSize2Pow);
+ return GetInChunk(aPtr, chunk, pageind);
+ }
+
+ extent_node_t key;
+
+ // Huge allocation
+ key.mAddr = chunk;
+ MutexAutoLock lock(huge_mtx);
+ extent_node_t* node = huge.Search(&key);
+ if (Validate && !node) {
+ return AllocInfo();
+ }
+ return AllocInfo(node->mSize, node);
+ }
+
+ // Get the allocation information for a pointer we know is within a chunk
+ // (Small or large, not huge).
+ static inline AllocInfo GetInChunk(const void* aPtr, arena_chunk_t* aChunk,
+ size_t pageind) {
+ size_t mapbits = aChunk->map[pageind].bits;
+ MOZ_DIAGNOSTIC_ASSERT((mapbits & CHUNK_MAP_ALLOCATED) != 0);
+
+ size_t size;
+ if ((mapbits & CHUNK_MAP_LARGE) == 0) {
+ arena_run_t* run = (arena_run_t*)(mapbits & ~gPageSizeMask);
+ MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC);
+ size = run->mBin->mSizeClass;
+ } else {
+ size = mapbits & ~gPageSizeMask;
+ MOZ_DIAGNOSTIC_ASSERT(size != 0);
+ }
+
+ return AllocInfo(size, aChunk);
+ }
+
+ // Validate ptr before assuming that it points to an allocation. Currently,
+ // the following validation is performed:
+ //
+ // + Check that ptr is not nullptr.
+ //
+ // + Check that ptr lies within a mapped chunk.
+ static inline AllocInfo GetValidated(const void* aPtr) {
+ return Get<true>(aPtr);
+ }
+
+ AllocInfo() : mSize(0), mChunk(nullptr) {}
+
+ explicit AllocInfo(size_t aSize, arena_chunk_t* aChunk)
+ : mSize(aSize), mChunk(aChunk) {
+ MOZ_ASSERT(mSize <= gMaxLargeClass);
+ }
+
+ explicit AllocInfo(size_t aSize, extent_node_t* aNode)
+ : mSize(aSize), mNode(aNode) {
+ MOZ_ASSERT(mSize > gMaxLargeClass);
+ }
+
+ size_t Size() { return mSize; }
+
+ arena_t* Arena() {
+ if (mSize <= gMaxLargeClass) {
+ return mChunk->arena;
+ }
+ // Best effort detection that we're not trying to access an already
+ // disposed arena. In the case of a disposed arena, the memory location
+ // pointed by mNode->mArena is either free (but still a valid memory
+ // region, per TypedBaseAlloc<arena_t>), in which case its id was reset,
+ // or has been reallocated for a new region, and its id is very likely
+ // different (per randomness). In both cases, the id is unlikely to
+ // match what it was for the disposed arena.
+ MOZ_RELEASE_ASSERT(mNode->mArenaId == mNode->mArena->mId);
+ return mNode->mArena;
+ }
+
+ bool IsValid() const { return !!mSize; }
+
+ private:
+ size_t mSize;
+ union {
+ // Pointer to the chunk associated with the allocation for small
+ // and large allocations.
+ arena_chunk_t* mChunk;
+
+ // Pointer to the extent node for huge allocations.
+ extent_node_t* mNode;
+ };
+};
+
+template <>
+inline void MozJemalloc::jemalloc_ptr_info(const void* aPtr,
+ jemalloc_ptr_info_t* aInfo) {
+ arena_chunk_t* chunk = GetChunkForPtr(aPtr);
+
+ // Is the pointer null, or within one chunk's size of null?
+ // Alternatively, if the allocator is not initialized yet, the pointer
+ // can't be known.
+ if (!chunk || !malloc_initialized) {
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ return;
+ }
+
+ // Look for huge allocations before looking for |chunk| in gChunkRTree.
+ // This is necessary because |chunk| won't be in gChunkRTree if it's
+ // the second or subsequent chunk in a huge allocation.
+ extent_node_t* node;
+ extent_node_t key;
+ {
+ MutexAutoLock lock(huge_mtx);
+ key.mAddr = const_cast<void*>(aPtr);
+ node =
+ reinterpret_cast<RedBlackTree<extent_node_t, ExtentTreeBoundsTrait>*>(
+ &huge)
+ ->Search(&key);
+ if (node) {
+ *aInfo = {TagLiveAlloc, node->mAddr, node->mSize, node->mArena->mId};
+ return;
+ }
+ }
+
+ // It's not a huge allocation. Check if we have a known chunk.
+ if (!gChunkRTree.Get(chunk)) {
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ return;
+ }
+
+ MOZ_DIAGNOSTIC_ASSERT(chunk->arena->mMagic == ARENA_MAGIC);
+
+ // Get the page number within the chunk.
+ size_t pageind = (((uintptr_t)aPtr - (uintptr_t)chunk) >> gPageSize2Pow);
+ if (pageind < gChunkHeaderNumPages) {
+ // Within the chunk header.
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ return;
+ }
+
+ size_t mapbits = chunk->map[pageind].bits;
+
+ if (!(mapbits & CHUNK_MAP_ALLOCATED)) {
+ void* pageaddr = (void*)(uintptr_t(aPtr) & ~gPageSizeMask);
+ *aInfo = {TagFreedPage, pageaddr, gPageSize, chunk->arena->mId};
+ return;
+ }
+
+ if (mapbits & CHUNK_MAP_LARGE) {
+ // It's a large allocation. Only the first page of a large
+ // allocation contains its size, so if the address is not in
+ // the first page, scan back to find the allocation size.
+ size_t size;
+ while (true) {
+ size = mapbits & ~gPageSizeMask;
+ if (size != 0) {
+ break;
+ }
+
+ // The following two return paths shouldn't occur in
+ // practice unless there is heap corruption.
+ pageind--;
+ MOZ_DIAGNOSTIC_ASSERT(pageind >= gChunkHeaderNumPages);
+ if (pageind < gChunkHeaderNumPages) {
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ return;
+ }
+
+ mapbits = chunk->map[pageind].bits;
+ MOZ_DIAGNOSTIC_ASSERT(mapbits & CHUNK_MAP_LARGE);
+ if (!(mapbits & CHUNK_MAP_LARGE)) {
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ return;
+ }
+ }
+
+ void* addr = ((char*)chunk) + (pageind << gPageSize2Pow);
+ *aInfo = {TagLiveAlloc, addr, size, chunk->arena->mId};
+ return;
+ }
+
+ // It must be a small allocation.
+ auto run = (arena_run_t*)(mapbits & ~gPageSizeMask);
+ MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC);
+
+ // The allocation size is stored in the run metadata.
+ size_t size = run->mBin->mSizeClass;
+
+ // Address of the first possible pointer in the run after its headers.
+ uintptr_t reg0_addr = (uintptr_t)run + run->mBin->mRunFirstRegionOffset;
+ if (aPtr < (void*)reg0_addr) {
+ // In the run header.
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ return;
+ }
+
+ // Position in the run.
+ unsigned regind = ((uintptr_t)aPtr - reg0_addr) / size;
+
+ // Pointer to the allocation's base address.
+ void* addr = (void*)(reg0_addr + regind * size);
+
+ // Check if the allocation has been freed.
+ unsigned elm = regind >> (LOG2(sizeof(int)) + 3);
+ unsigned bit = regind - (elm << (LOG2(sizeof(int)) + 3));
+ PtrInfoTag tag =
+ ((run->mRegionsMask[elm] & (1U << bit))) ? TagFreedAlloc : TagLiveAlloc;
+
+ *aInfo = {tag, addr, size, chunk->arena->mId};
+}
+
+namespace Debug {
+// Helper for debuggers. We don't want it to be inlined and optimized out.
+MOZ_NEVER_INLINE jemalloc_ptr_info_t* jemalloc_ptr_info(const void* aPtr) {
+ static jemalloc_ptr_info_t info;
+ MozJemalloc::jemalloc_ptr_info(aPtr, &info);
+ return &info;
+}
+} // namespace Debug
+
+arena_chunk_t* arena_t::DallocSmall(arena_chunk_t* aChunk, void* aPtr,
+ arena_chunk_map_t* aMapElm) {
+ arena_run_t* run;
+ arena_bin_t* bin;
+ size_t size;
+
+ run = (arena_run_t*)(aMapElm->bits & ~gPageSizeMask);
+ MOZ_DIAGNOSTIC_ASSERT(run->mMagic == ARENA_RUN_MAGIC);
+ bin = run->mBin;
+ size = bin->mSizeClass;
+ MOZ_DIAGNOSTIC_ASSERT(uintptr_t(aPtr) >=
+ uintptr_t(run) + bin->mRunFirstRegionOffset);
+
+ arena_run_reg_dalloc(run, bin, aPtr, size);
+ run->mNumFree++;
+ arena_chunk_t* dealloc_chunk = nullptr;
+
+ if (run->mNumFree == bin->mRunNumRegions) {
+ // Deallocate run.
+ if (run == bin->mCurrentRun) {
+ bin->mCurrentRun = nullptr;
+ } else if (bin->mRunNumRegions != 1) {
+ size_t run_pageind =
+ (uintptr_t(run) - uintptr_t(aChunk)) >> gPageSize2Pow;
+ arena_chunk_map_t* run_mapelm = &aChunk->map[run_pageind];
+
+ // This block's conditional is necessary because if the
+ // run only contains one region, then it never gets
+ // inserted into the non-full runs tree.
+ MOZ_DIAGNOSTIC_ASSERT(bin->mNonFullRuns.Search(run_mapelm) == run_mapelm);
+ bin->mNonFullRuns.Remove(run_mapelm);
+ }
+#if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
+ run->mMagic = 0;
+#endif
+ dealloc_chunk = DallocRun(run, true);
+ bin->mNumRuns--;
+ } else if (run->mNumFree == 1 && run != bin->mCurrentRun) {
+ // Make sure that bin->mCurrentRun always refers to the lowest
+ // non-full run, if one exists.
+ if (!bin->mCurrentRun) {
+ bin->mCurrentRun = run;
+ } else if (uintptr_t(run) < uintptr_t(bin->mCurrentRun)) {
+ // Switch mCurrentRun.
+ if (bin->mCurrentRun->mNumFree > 0) {
+ arena_chunk_t* runcur_chunk = GetChunkForPtr(bin->mCurrentRun);
+ size_t runcur_pageind =
+ (uintptr_t(bin->mCurrentRun) - uintptr_t(runcur_chunk)) >>
+ gPageSize2Pow;
+ arena_chunk_map_t* runcur_mapelm = &runcur_chunk->map[runcur_pageind];
+
+ // Insert runcur.
+ MOZ_DIAGNOSTIC_ASSERT(!bin->mNonFullRuns.Search(runcur_mapelm));
+ bin->mNonFullRuns.Insert(runcur_mapelm);
+ }
+ bin->mCurrentRun = run;
+ } else {
+ size_t run_pageind =
+ (uintptr_t(run) - uintptr_t(aChunk)) >> gPageSize2Pow;
+ arena_chunk_map_t* run_mapelm = &aChunk->map[run_pageind];
+
+ MOZ_DIAGNOSTIC_ASSERT(bin->mNonFullRuns.Search(run_mapelm) == nullptr);
+ bin->mNonFullRuns.Insert(run_mapelm);
+ }
+ }
+ mStats.allocated_small -= size;
+
+ return dealloc_chunk;
+}
+
+arena_chunk_t* arena_t::DallocLarge(arena_chunk_t* aChunk, void* aPtr) {
+ MOZ_DIAGNOSTIC_ASSERT((uintptr_t(aPtr) & gPageSizeMask) == 0);
+ size_t pageind = (uintptr_t(aPtr) - uintptr_t(aChunk)) >> gPageSize2Pow;
+ size_t size = aChunk->map[pageind].bits & ~gPageSizeMask;
+
+ mStats.allocated_large -= size;
+
+ return DallocRun((arena_run_t*)aPtr, true);
+}
+
+static inline void arena_dalloc(void* aPtr, size_t aOffset, arena_t* aArena) {
+ MOZ_ASSERT(aPtr);
+ MOZ_ASSERT(aOffset != 0);
+ MOZ_ASSERT(GetChunkOffsetForPtr(aPtr) == aOffset);
+
+ auto chunk = (arena_chunk_t*)((uintptr_t)aPtr - aOffset);
+ auto arena = chunk->arena;
+ MOZ_ASSERT(arena);
+ MOZ_DIAGNOSTIC_ASSERT(arena->mMagic == ARENA_MAGIC);
+ MOZ_RELEASE_ASSERT(!aArena || arena == aArena);
+
+ size_t pageind = aOffset >> gPageSize2Pow;
+ if (opt_poison) {
+ AllocInfo info = AllocInfo::GetInChunk(aPtr, chunk, pageind);
+ MOZ_ASSERT(info.IsValid());
+ MaybePoison(aPtr, info.Size());
+ }
+
+ arena_chunk_t* chunk_dealloc_delay = nullptr;
+
+ {
+ MutexAutoLock lock(arena->mLock);
+ arena_chunk_map_t* mapelm = &chunk->map[pageind];
+ MOZ_RELEASE_ASSERT((mapelm->bits & CHUNK_MAP_DECOMMITTED) == 0,
+ "Freeing in decommitted page.");
+ MOZ_RELEASE_ASSERT((mapelm->bits & CHUNK_MAP_ALLOCATED) != 0,
+ "Double-free?");
+ if ((mapelm->bits & CHUNK_MAP_LARGE) == 0) {
+ // Small allocation.
+ chunk_dealloc_delay = arena->DallocSmall(chunk, aPtr, mapelm);
+ } else {
+ // Large allocation.
+ chunk_dealloc_delay = arena->DallocLarge(chunk, aPtr);
+ }
+ }
+
+ if (chunk_dealloc_delay) {
+ chunk_dealloc((void*)chunk_dealloc_delay, kChunkSize, ARENA_CHUNK);
+ }
+}
+
+static inline void idalloc(void* ptr, arena_t* aArena) {
+ size_t offset;
+
+ MOZ_ASSERT(ptr);
+
+ offset = GetChunkOffsetForPtr(ptr);
+ if (offset != 0) {
+ arena_dalloc(ptr, offset, aArena);
+ } else {
+ huge_dalloc(ptr, aArena);
+ }
+}
+
+void arena_t::RallocShrinkLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize,
+ size_t aOldSize) {
+ MOZ_ASSERT(aSize < aOldSize);
+
+ // Shrink the run, and make trailing pages available for other
+ // allocations.
+ MutexAutoLock lock(mLock);
+ TrimRunTail(aChunk, (arena_run_t*)aPtr, aOldSize, aSize, true);
+ mStats.allocated_large -= aOldSize - aSize;
+}
+
+// Returns whether reallocation was successful.
+bool arena_t::RallocGrowLarge(arena_chunk_t* aChunk, void* aPtr, size_t aSize,
+ size_t aOldSize) {
+ size_t pageind = (uintptr_t(aPtr) - uintptr_t(aChunk)) >> gPageSize2Pow;
+ size_t npages = aOldSize >> gPageSize2Pow;
+
+ MutexAutoLock lock(mLock);
+ MOZ_DIAGNOSTIC_ASSERT(aOldSize ==
+ (aChunk->map[pageind].bits & ~gPageSizeMask));
+
+ // Try to extend the run.
+ MOZ_ASSERT(aSize > aOldSize);
+ if (pageind + npages < gChunkNumPages - 1 &&
+ (aChunk->map[pageind + npages].bits & CHUNK_MAP_ALLOCATED) == 0 &&
+ (aChunk->map[pageind + npages].bits & ~gPageSizeMask) >=
+ aSize - aOldSize) {
+ // The next run is available and sufficiently large. Split the
+ // following run, then merge the first part with the existing
+ // allocation.
+ if (!SplitRun((arena_run_t*)(uintptr_t(aChunk) +
+ ((pageind + npages) << gPageSize2Pow)),
+ aSize - aOldSize, true, false)) {
+ return false;
+ }
+
+ aChunk->map[pageind].bits = aSize | CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
+ aChunk->map[pageind + npages].bits = CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED;
+
+ mStats.allocated_large += aSize - aOldSize;
+ return true;
+ }
+
+ return false;
+}
+
+void* arena_t::RallocSmallOrLarge(void* aPtr, size_t aSize, size_t aOldSize) {
+ void* ret;
+ size_t copysize;
+ SizeClass sizeClass(aSize);
+
+ // Try to avoid moving the allocation.
+ if (aOldSize <= gMaxLargeClass && sizeClass.Size() == aOldSize) {
+ if (aSize < aOldSize) {
+ MaybePoison((void*)(uintptr_t(aPtr) + aSize), aOldSize - aSize);
+ }
+ return aPtr;
+ }
+ if (sizeClass.Type() == SizeClass::Large && aOldSize > gMaxBinClass &&
+ aOldSize <= gMaxLargeClass) {
+ arena_chunk_t* chunk = GetChunkForPtr(aPtr);
+ if (sizeClass.Size() < aOldSize) {
+ // Fill before shrinking in order to avoid a race.
+ MaybePoison((void*)((uintptr_t)aPtr + aSize), aOldSize - aSize);
+ RallocShrinkLarge(chunk, aPtr, sizeClass.Size(), aOldSize);
+ return aPtr;
+ }
+ if (RallocGrowLarge(chunk, aPtr, sizeClass.Size(), aOldSize)) {
+ ApplyZeroOrJunk((void*)((uintptr_t)aPtr + aOldSize), aSize - aOldSize);
+ return aPtr;
+ }
+ }
+
+ // If we get here, then aSize and aOldSize are different enough that we
+ // need to move the object. In that case, fall back to allocating new
+ // space and copying. Allow non-private arenas to switch arenas.
+ ret = (mIsPrivate ? this : choose_arena(aSize))->Malloc(aSize, false);
+ if (!ret) {
+ return nullptr;
+ }
+
+ // Junk/zero-filling were already done by arena_t::Malloc().
+ copysize = (aSize < aOldSize) ? aSize : aOldSize;
+#ifdef VM_COPY_MIN
+ if (copysize >= VM_COPY_MIN) {
+ pages_copy(ret, aPtr, copysize);
+ } else
+#endif
+ {
+ memcpy(ret, aPtr, copysize);
+ }
+ idalloc(aPtr, this);
+ return ret;
+}
+
+void* arena_t::Ralloc(void* aPtr, size_t aSize, size_t aOldSize) {
+ MOZ_DIAGNOSTIC_ASSERT(mMagic == ARENA_MAGIC);
+ MOZ_ASSERT(aPtr);
+ MOZ_ASSERT(aSize != 0);
+
+ return (aSize <= gMaxLargeClass) ? RallocSmallOrLarge(aPtr, aSize, aOldSize)
+ : RallocHuge(aPtr, aSize, aOldSize);
+}
+
+void* arena_t::operator new(size_t aCount, const fallible_t&) noexcept {
+ MOZ_ASSERT(aCount == sizeof(arena_t));
+ return TypedBaseAlloc<arena_t>::alloc();
+}
+
+void arena_t::operator delete(void* aPtr) {
+ TypedBaseAlloc<arena_t>::dealloc((arena_t*)aPtr);
+}
+
+arena_t::arena_t(arena_params_t* aParams, bool aIsPrivate) {
+ unsigned i;
+
+ MOZ_RELEASE_ASSERT(mLock.Init());
+
+ memset(&mLink, 0, sizeof(mLink));
+ memset(&mStats, 0, sizeof(arena_stats_t));
+ mId = 0;
+
+ // Initialize chunks.
+ mChunksDirty.Init();
+#ifdef MALLOC_DOUBLE_PURGE
+ new (&mChunksMAdvised) DoublyLinkedList<arena_chunk_t>();
+#endif
+ mSpare = nullptr;
+
+ mRandomizeSmallAllocations = opt_randomize_small;
+ if (aParams) {
+ uint32_t flags = aParams->mFlags & ARENA_FLAG_RANDOMIZE_SMALL_MASK;
+ switch (flags) {
+ case ARENA_FLAG_RANDOMIZE_SMALL_ENABLED:
+ mRandomizeSmallAllocations = true;
+ break;
+ case ARENA_FLAG_RANDOMIZE_SMALL_DISABLED:
+ mRandomizeSmallAllocations = false;
+ break;
+ case ARENA_FLAG_RANDOMIZE_SMALL_DEFAULT:
+ default:
+ break;
+ }
+
+ mMaxDirtyIncreaseOverride = aParams->mMaxDirtyIncreaseOverride;
+ mMaxDirtyDecreaseOverride = aParams->mMaxDirtyDecreaseOverride;
+ } else {
+ mMaxDirtyIncreaseOverride = 0;
+ mMaxDirtyDecreaseOverride = 0;
+ }
+
+ mPRNG = nullptr;
+
+ mIsPrivate = aIsPrivate;
+
+ mNumDirty = 0;
+ // The default maximum amount of dirty pages allowed on arenas is a fraction
+ // of opt_dirty_max.
+ mMaxDirty = (aParams && aParams->mMaxDirty) ? aParams->mMaxDirty
+ : (opt_dirty_max / 8);
+
+ mRunsAvail.Init();
+
+ // Initialize bins.
+ SizeClass sizeClass(1);
+
+ for (i = 0;; i++) {
+ arena_bin_t& bin = mBins[i];
+ bin.Init(sizeClass);
+
+ // SizeClass doesn't want sizes larger than gMaxBinClass for now.
+ if (sizeClass.Size() == gMaxBinClass) {
+ break;
+ }
+ sizeClass = sizeClass.Next();
+ }
+ MOZ_ASSERT(i == NUM_SMALL_CLASSES - 1);
+
+#if defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
+ mMagic = ARENA_MAGIC;
+#endif
+}
+
+arena_t::~arena_t() {
+ size_t i;
+ MutexAutoLock lock(mLock);
+ MOZ_RELEASE_ASSERT(!mLink.Left() && !mLink.Right(),
+ "Arena is still registered");
+ MOZ_RELEASE_ASSERT(!mStats.allocated_small && !mStats.allocated_large,
+ "Arena is not empty");
+ if (mSpare) {
+ chunk_dealloc(mSpare, kChunkSize, ARENA_CHUNK);
+ }
+ for (i = 0; i < NUM_SMALL_CLASSES; i++) {
+ MOZ_RELEASE_ASSERT(!mBins[i].mNonFullRuns.First(), "Bin is not empty");
+ }
+#ifdef MOZ_DEBUG
+ {
+ MutexAutoLock lock(huge_mtx);
+ // This is an expensive check, so we only do it on debug builds.
+ for (auto node : huge.iter()) {
+ MOZ_RELEASE_ASSERT(node->mArenaId != mId, "Arena has huge allocations");
+ }
+ }
+#endif
+ mId = 0;
+}
+
+arena_t* ArenaCollection::CreateArena(bool aIsPrivate,
+ arena_params_t* aParams) {
+ arena_t* ret = new (fallible) arena_t(aParams, aIsPrivate);
+ if (!ret) {
+ // Only reached if there is an OOM error.
+
+ // OOM here is quite inconvenient to propagate, since dealing with it
+ // would require a check for failure in the fast path. Instead, punt
+ // by using the first arena.
+ // In practice, this is an extremely unlikely failure.
+ _malloc_message(_getprogname(), ": (malloc) Error initializing arena\n");
+
+ return mDefaultArena;
+ }
+
+ MutexAutoLock lock(mLock);
+
+ // For public arenas, it's fine to just use incrementing arena id
+ if (!aIsPrivate) {
+ ret->mId = mLastPublicArenaId++;
+ mArenas.Insert(ret);
+ return ret;
+ }
+
+ // For private arenas, generate a cryptographically-secure random id for the
+ // new arena. If an attacker manages to get control of the process, this
+ // should make it more difficult for them to "guess" the ID of a memory
+ // arena, stopping them from getting data they may want
+
+ while (true) {
+ mozilla::Maybe<uint64_t> maybeRandomId = mozilla::RandomUint64();
+ MOZ_RELEASE_ASSERT(maybeRandomId.isSome());
+
+ // Avoid 0 as an arena Id. We use 0 for disposed arenas.
+ if (!maybeRandomId.value()) {
+ continue;
+ }
+
+ // Keep looping until we ensure that the random number we just generated
+ // isn't already in use by another active arena
+ arena_t* existingArena =
+ GetByIdInternal(maybeRandomId.value(), true /*aIsPrivate*/);
+
+ if (!existingArena) {
+ ret->mId = static_cast<arena_id_t>(maybeRandomId.value());
+ mPrivateArenas.Insert(ret);
+ return ret;
+ }
+ }
+}
+
+// End arena.
+// ***************************************************************************
+// Begin general internal functions.
+
+void* arena_t::MallocHuge(size_t aSize, bool aZero) {
+ return PallocHuge(aSize, kChunkSize, aZero);
+}
+
+void* arena_t::PallocHuge(size_t aSize, size_t aAlignment, bool aZero) {
+ void* ret;
+ size_t csize;
+ size_t psize;
+ extent_node_t* node;
+ bool zeroed;
+
+ // We're going to configure guard pages in the region between the
+ // page-aligned size and the chunk-aligned size, so if those are the same
+ // then we need to force that region into existence.
+ csize = CHUNK_CEILING(aSize + gPageSize);
+ if (csize < aSize) {
+ // size is large enough to cause size_t wrap-around.
+ return nullptr;
+ }
+
+ // Allocate an extent node with which to track the chunk.
+ node = ExtentAlloc::alloc();
+ if (!node) {
+ return nullptr;
+ }
+
+ // Allocate one or more contiguous chunks for this request.
+ ret = chunk_alloc(csize, aAlignment, false, &zeroed);
+ if (!ret) {
+ ExtentAlloc::dealloc(node);
+ return nullptr;
+ }
+ psize = PAGE_CEILING(aSize);
+ if (aZero) {
+ // We will decommit anything past psize so there is no need to zero
+ // further.
+ chunk_ensure_zero(ret, psize, zeroed);
+ }
+
+ // Insert node into huge.
+ node->mAddr = ret;
+ node->mSize = psize;
+ node->mArena = this;
+ node->mArenaId = mId;
+
+ {
+ MutexAutoLock lock(huge_mtx);
+ huge.Insert(node);
+
+ // Although we allocated space for csize bytes, we indicate that we've
+ // allocated only psize bytes.
+ //
+ // If DECOMMIT is defined, this is a reasonable thing to do, since
+ // we'll explicitly decommit the bytes in excess of psize.
+ //
+ // If DECOMMIT is not defined, then we're relying on the OS to be lazy
+ // about how it allocates physical pages to mappings. If we never
+ // touch the pages in excess of psize, the OS won't allocate a physical
+ // page, and we won't use more than psize bytes of physical memory.
+ //
+ // A correct program will only touch memory in excess of how much it
+ // requested if it first calls malloc_usable_size and finds out how
+ // much space it has to play with. But because we set node->mSize =
+ // psize above, malloc_usable_size will return psize, not csize, and
+ // the program will (hopefully) never touch bytes in excess of psize.
+ // Thus those bytes won't take up space in physical memory, and we can
+ // reasonably claim we never "allocated" them in the first place.
+ huge_allocated += psize;
+ huge_mapped += csize;
+ }
+
+ pages_decommit((void*)((uintptr_t)ret + psize), csize - psize);
+
+ if (!aZero) {
+ ApplyZeroOrJunk(ret, psize);
+ }
+
+ return ret;
+}
+
+void* arena_t::RallocHuge(void* aPtr, size_t aSize, size_t aOldSize) {
+ void* ret;
+ size_t copysize;
+
+ // Avoid moving the allocation if the size class would not change.
+ if (aOldSize > gMaxLargeClass &&
+ CHUNK_CEILING(aSize + gPageSize) == CHUNK_CEILING(aOldSize + gPageSize)) {
+ size_t psize = PAGE_CEILING(aSize);
+ if (aSize < aOldSize) {
+ MaybePoison((void*)((uintptr_t)aPtr + aSize), aOldSize - aSize);
+ }
+ if (psize < aOldSize) {
+ extent_node_t key;
+
+ pages_decommit((void*)((uintptr_t)aPtr + psize), aOldSize - psize);
+
+ // Update recorded size.
+ MutexAutoLock lock(huge_mtx);
+ key.mAddr = const_cast<void*>(aPtr);
+ extent_node_t* node = huge.Search(&key);
+ MOZ_ASSERT(node);
+ MOZ_ASSERT(node->mSize == aOldSize);
+ MOZ_RELEASE_ASSERT(node->mArena == this);
+ huge_allocated -= aOldSize - psize;
+ // No need to change huge_mapped, because we didn't (un)map anything.
+ node->mSize = psize;
+ } else if (psize > aOldSize) {
+ if (!pages_commit((void*)((uintptr_t)aPtr + aOldSize),
+ psize - aOldSize)) {
+ return nullptr;
+ }
+
+ // We need to update the recorded size if the size increased,
+ // so malloc_usable_size doesn't return a value smaller than
+ // what was requested via realloc().
+ extent_node_t key;
+ MutexAutoLock lock(huge_mtx);
+ key.mAddr = const_cast<void*>(aPtr);
+ extent_node_t* node = huge.Search(&key);
+ MOZ_ASSERT(node);
+ MOZ_ASSERT(node->mSize == aOldSize);
+ MOZ_RELEASE_ASSERT(node->mArena == this);
+ huge_allocated += psize - aOldSize;
+ // No need to change huge_mapped, because we didn't
+ // (un)map anything.
+ node->mSize = psize;
+ }
+
+ if (aSize > aOldSize) {
+ ApplyZeroOrJunk((void*)((uintptr_t)aPtr + aOldSize), aSize - aOldSize);
+ }
+ return aPtr;
+ }
+
+ // If we get here, then aSize and aOldSize are different enough that we
+ // need to use a different size class. In that case, fall back to allocating
+ // new space and copying. Allow non-private arenas to switch arenas.
+ ret = (mIsPrivate ? this : choose_arena(aSize))->MallocHuge(aSize, false);
+ if (!ret) {
+ return nullptr;
+ }
+
+ copysize = (aSize < aOldSize) ? aSize : aOldSize;
+#ifdef VM_COPY_MIN
+ if (copysize >= VM_COPY_MIN) {
+ pages_copy(ret, aPtr, copysize);
+ } else
+#endif
+ {
+ memcpy(ret, aPtr, copysize);
+ }
+ idalloc(aPtr, this);
+ return ret;
+}
+
+static void huge_dalloc(void* aPtr, arena_t* aArena) {
+ extent_node_t* node;
+ size_t mapped = 0;
+ {
+ extent_node_t key;
+ MutexAutoLock lock(huge_mtx);
+
+ // Extract from tree of huge allocations.
+ key.mAddr = aPtr;
+ node = huge.Search(&key);
+ MOZ_RELEASE_ASSERT(node, "Double-free?");
+ MOZ_ASSERT(node->mAddr == aPtr);
+ MOZ_RELEASE_ASSERT(!aArena || node->mArena == aArena);
+ // See AllocInfo::Arena.
+ MOZ_RELEASE_ASSERT(node->mArenaId == node->mArena->mId);
+ huge.Remove(node);
+
+ mapped = CHUNK_CEILING(node->mSize + gPageSize);
+ huge_allocated -= node->mSize;
+ huge_mapped -= mapped;
+ }
+
+ // Unmap chunk.
+ chunk_dealloc(node->mAddr, mapped, HUGE_CHUNK);
+
+ ExtentAlloc::dealloc(node);
+}
+
+static size_t GetKernelPageSize() {
+ static size_t kernel_page_size = ([]() {
+#ifdef XP_WIN
+ SYSTEM_INFO info;
+ GetSystemInfo(&info);
+ return info.dwPageSize;
+#else
+ long result = sysconf(_SC_PAGESIZE);
+ MOZ_ASSERT(result != -1);
+ return result;
+#endif
+ })();
+ return kernel_page_size;
+}
+
+// Returns whether the allocator was successfully initialized.
+static bool malloc_init_hard() {
+ unsigned i;
+ const char* opts;
+
+ AutoLock<StaticMutex> lock(gInitLock);
+
+ if (malloc_initialized) {
+ // Another thread initialized the allocator before this one
+ // acquired gInitLock.
+ return true;
+ }
+
+ if (!thread_arena.init()) {
+ return true;
+ }
+
+ // Get page size and number of CPUs
+ const size_t result = GetKernelPageSize();
+ // We assume that the page size is a power of 2.
+ MOZ_ASSERT(((result - 1) & result) == 0);
+#ifdef MALLOC_STATIC_PAGESIZE
+ if (gPageSize % result) {
+ _malloc_message(
+ _getprogname(),
+ "Compile-time page size does not divide the runtime one.\n");
+ MOZ_CRASH();
+ }
+#else
+ gRealPageSize = gPageSize = result;
+#endif
+
+ // Get runtime configuration.
+ if ((opts = getenv("MALLOC_OPTIONS"))) {
+ for (i = 0; opts[i] != '\0'; i++) {
+ unsigned j, nreps;
+ bool nseen;
+
+ // Parse repetition count, if any.
+ for (nreps = 0, nseen = false;; i++, nseen = true) {
+ switch (opts[i]) {
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ nreps *= 10;
+ nreps += opts[i] - '0';
+ break;
+ default:
+ goto MALLOC_OUT;
+ }
+ }
+ MALLOC_OUT:
+ if (nseen == false) {
+ nreps = 1;
+ }
+
+ for (j = 0; j < nreps; j++) {
+ switch (opts[i]) {
+ case 'f':
+ opt_dirty_max >>= 1;
+ break;
+ case 'F':
+ if (opt_dirty_max == 0) {
+ opt_dirty_max = 1;
+ } else if ((opt_dirty_max << 1) != 0) {
+ opt_dirty_max <<= 1;
+ }
+ break;
+#ifdef MALLOC_RUNTIME_CONFIG
+ case 'j':
+ opt_junk = false;
+ break;
+ case 'J':
+ opt_junk = true;
+ break;
+ case 'q':
+ opt_poison = false;
+ break;
+ case 'Q':
+ opt_poison = true;
+ break;
+ case 'z':
+ opt_zero = false;
+ break;
+ case 'Z':
+ opt_zero = true;
+ break;
+# ifndef MALLOC_STATIC_PAGESIZE
+ case 'P':
+ if (gPageSize < 64_KiB) {
+ gPageSize <<= 1;
+ }
+ break;
+# endif
+#endif
+ case 'r':
+ opt_randomize_small = false;
+ break;
+ case 'R':
+ opt_randomize_small = true;
+ break;
+ default: {
+ char cbuf[2];
+
+ cbuf[0] = opts[i];
+ cbuf[1] = '\0';
+ _malloc_message(_getprogname(),
+ ": (malloc) Unsupported character "
+ "in malloc options: '",
+ cbuf, "'\n");
+ }
+ }
+ }
+ }
+ }
+
+#ifndef MALLOC_STATIC_PAGESIZE
+ DefineGlobals();
+#endif
+ gRecycledSize = 0;
+
+ // Initialize chunks data.
+ chunks_mtx.Init();
+ MOZ_PUSH_IGNORE_THREAD_SAFETY
+ gChunksBySize.Init();
+ gChunksByAddress.Init();
+ MOZ_POP_THREAD_SAFETY
+
+ // Initialize huge allocation data.
+ huge_mtx.Init();
+ MOZ_PUSH_IGNORE_THREAD_SAFETY
+ huge.Init();
+ huge_allocated = 0;
+ huge_mapped = 0;
+ MOZ_POP_THREAD_SAFETY
+
+ // Initialize base allocation data structures.
+ base_mtx.Init();
+ MOZ_PUSH_IGNORE_THREAD_SAFETY
+ base_mapped = 0;
+ base_committed = 0;
+ MOZ_POP_THREAD_SAFETY
+
+ // Initialize arenas collection here.
+ if (!gArenas.Init()) {
+ return false;
+ }
+
+ // Assign the default arena to the initial thread.
+ thread_arena.set(gArenas.GetDefault());
+
+ if (!gChunkRTree.Init()) {
+ return false;
+ }
+
+ malloc_initialized = true;
+
+ // Dummy call so that the function is not removed by dead-code elimination
+ Debug::jemalloc_ptr_info(nullptr);
+
+#if !defined(XP_WIN) && !defined(XP_DARWIN)
+ // Prevent potential deadlock on malloc locks after fork.
+ pthread_atfork(_malloc_prefork, _malloc_postfork_parent,
+ _malloc_postfork_child);
+#endif
+
+ return true;
+}
+
+// End general internal functions.
+// ***************************************************************************
+// Begin malloc(3)-compatible functions.
+
+// The BaseAllocator class is a helper class that implements the base allocator
+// functions (malloc, calloc, realloc, free, memalign) for a given arena,
+// or an appropriately chosen arena (per choose_arena()) when none is given.
+struct BaseAllocator {
+#define MALLOC_DECL(name, return_type, ...) \
+ inline return_type name(__VA_ARGS__);
+
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
+#include "malloc_decls.h"
+
+ explicit BaseAllocator(arena_t* aArena) : mArena(aArena) {}
+
+ private:
+ arena_t* mArena;
+};
+
+#define MALLOC_DECL(name, return_type, ...) \
+ template <> \
+ inline return_type MozJemalloc::name( \
+ ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) { \
+ BaseAllocator allocator(nullptr); \
+ return allocator.name(ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
+ }
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
+#include "malloc_decls.h"
+
+inline void* BaseAllocator::malloc(size_t aSize) {
+ void* ret;
+ arena_t* arena;
+
+ if (!malloc_init()) {
+ ret = nullptr;
+ goto RETURN;
+ }
+
+ if (aSize == 0) {
+ aSize = 1;
+ }
+ arena = mArena ? mArena : choose_arena(aSize);
+ ret = arena->Malloc(aSize, /* aZero = */ false);
+
+RETURN:
+ if (!ret) {
+ errno = ENOMEM;
+ }
+
+ return ret;
+}
+
+inline void* BaseAllocator::memalign(size_t aAlignment, size_t aSize) {
+ MOZ_ASSERT(((aAlignment - 1) & aAlignment) == 0);
+
+ if (!malloc_init()) {
+ return nullptr;
+ }
+
+ if (aSize == 0) {
+ aSize = 1;
+ }
+
+ aAlignment = aAlignment < sizeof(void*) ? sizeof(void*) : aAlignment;
+ arena_t* arena = mArena ? mArena : choose_arena(aSize);
+ return arena->Palloc(aAlignment, aSize);
+}
+
+inline void* BaseAllocator::calloc(size_t aNum, size_t aSize) {
+ void* ret;
+
+ if (malloc_init()) {
+ CheckedInt<size_t> checkedSize = CheckedInt<size_t>(aNum) * aSize;
+ if (checkedSize.isValid()) {
+ size_t allocSize = checkedSize.value();
+ if (allocSize == 0) {
+ allocSize = 1;
+ }
+ arena_t* arena = mArena ? mArena : choose_arena(allocSize);
+ ret = arena->Malloc(allocSize, /* aZero = */ true);
+ } else {
+ ret = nullptr;
+ }
+ } else {
+ ret = nullptr;
+ }
+
+ if (!ret) {
+ errno = ENOMEM;
+ }
+
+ return ret;
+}
+
+inline void* BaseAllocator::realloc(void* aPtr, size_t aSize) {
+ void* ret;
+
+ if (aSize == 0) {
+ aSize = 1;
+ }
+
+ if (aPtr) {
+ MOZ_RELEASE_ASSERT(malloc_initialized);
+
+ auto info = AllocInfo::Get(aPtr);
+ auto arena = info.Arena();
+ MOZ_RELEASE_ASSERT(!mArena || arena == mArena);
+ ret = arena->Ralloc(aPtr, aSize, info.Size());
+ } else {
+ if (!malloc_init()) {
+ ret = nullptr;
+ } else {
+ arena_t* arena = mArena ? mArena : choose_arena(aSize);
+ ret = arena->Malloc(aSize, /* aZero = */ false);
+ }
+ }
+
+ if (!ret) {
+ errno = ENOMEM;
+ }
+ return ret;
+}
+
+inline void BaseAllocator::free(void* aPtr) {
+ size_t offset;
+
+ // A version of idalloc that checks for nullptr pointer.
+ offset = GetChunkOffsetForPtr(aPtr);
+ if (offset != 0) {
+ MOZ_RELEASE_ASSERT(malloc_initialized);
+ arena_dalloc(aPtr, offset, mArena);
+ } else if (aPtr) {
+ MOZ_RELEASE_ASSERT(malloc_initialized);
+ huge_dalloc(aPtr, mArena);
+ }
+}
+
+template <void* (*memalign)(size_t, size_t)>
+struct AlignedAllocator {
+ static inline int posix_memalign(void** aMemPtr, size_t aAlignment,
+ size_t aSize) {
+ void* result;
+
+ // alignment must be a power of two and a multiple of sizeof(void*)
+ if (((aAlignment - 1) & aAlignment) != 0 || aAlignment < sizeof(void*)) {
+ return EINVAL;
+ }
+
+ // The 0-->1 size promotion is done in the memalign() call below
+ result = memalign(aAlignment, aSize);
+
+ if (!result) {
+ return ENOMEM;
+ }
+
+ *aMemPtr = result;
+ return 0;
+ }
+
+ static inline void* aligned_alloc(size_t aAlignment, size_t aSize) {
+ if (aSize % aAlignment) {
+ return nullptr;
+ }
+ return memalign(aAlignment, aSize);
+ }
+
+ static inline void* valloc(size_t aSize) {
+ return memalign(GetKernelPageSize(), aSize);
+ }
+};
+
+template <>
+inline int MozJemalloc::posix_memalign(void** aMemPtr, size_t aAlignment,
+ size_t aSize) {
+ return AlignedAllocator<memalign>::posix_memalign(aMemPtr, aAlignment, aSize);
+}
+
+template <>
+inline void* MozJemalloc::aligned_alloc(size_t aAlignment, size_t aSize) {
+ return AlignedAllocator<memalign>::aligned_alloc(aAlignment, aSize);
+}
+
+template <>
+inline void* MozJemalloc::valloc(size_t aSize) {
+ return AlignedAllocator<memalign>::valloc(aSize);
+}
+
+// End malloc(3)-compatible functions.
+// ***************************************************************************
+// Begin non-standard functions.
+
+// This was added by Mozilla for use by SQLite.
+template <>
+inline size_t MozJemalloc::malloc_good_size(size_t aSize) {
+ if (aSize <= gMaxLargeClass) {
+ // Small or large
+ aSize = SizeClass(aSize).Size();
+ } else {
+ // Huge. We use PAGE_CEILING to get psize, instead of using
+ // CHUNK_CEILING to get csize. This ensures that this
+ // malloc_usable_size(malloc(n)) always matches
+ // malloc_good_size(n).
+ aSize = PAGE_CEILING(aSize);
+ }
+ return aSize;
+}
+
+template <>
+inline size_t MozJemalloc::malloc_usable_size(usable_ptr_t aPtr) {
+ return AllocInfo::GetValidated(aPtr).Size();
+}
+
+template <>
+inline void MozJemalloc::jemalloc_stats_internal(
+ jemalloc_stats_t* aStats, jemalloc_bin_stats_t* aBinStats) {
+ size_t non_arena_mapped, chunk_header_size;
+
+ if (!aStats) {
+ return;
+ }
+ if (!malloc_init()) {
+ memset(aStats, 0, sizeof(*aStats));
+ return;
+ }
+ if (aBinStats) {
+ memset(aBinStats, 0, sizeof(jemalloc_bin_stats_t) * NUM_SMALL_CLASSES);
+ }
+
+ // Gather runtime settings.
+ aStats->opt_junk = opt_junk;
+ aStats->opt_zero = opt_zero;
+ aStats->quantum = kQuantum;
+ aStats->quantum_max = kMaxQuantumClass;
+ aStats->quantum_wide = kQuantumWide;
+ aStats->quantum_wide_max = kMaxQuantumWideClass;
+ aStats->subpage_max = gMaxSubPageClass;
+ aStats->large_max = gMaxLargeClass;
+ aStats->chunksize = kChunkSize;
+ aStats->page_size = gPageSize;
+ aStats->dirty_max = opt_dirty_max;
+
+ // Gather current memory usage statistics.
+ aStats->narenas = 0;
+ aStats->mapped = 0;
+ aStats->allocated = 0;
+ aStats->waste = 0;
+ aStats->page_cache = 0;
+ aStats->bookkeeping = 0;
+ aStats->bin_unused = 0;
+
+ non_arena_mapped = 0;
+
+ // Get huge mapped/allocated.
+ {
+ MutexAutoLock lock(huge_mtx);
+ non_arena_mapped += huge_mapped;
+ aStats->allocated += huge_allocated;
+ MOZ_ASSERT(huge_mapped >= huge_allocated);
+ }
+
+ // Get base mapped/allocated.
+ {
+ MutexAutoLock lock(base_mtx);
+ non_arena_mapped += base_mapped;
+ aStats->bookkeeping += base_committed;
+ MOZ_ASSERT(base_mapped >= base_committed);
+ }
+
+ gArenas.mLock.Lock();
+ // Iterate over arenas.
+ for (auto arena : gArenas.iter()) {
+ size_t arena_mapped, arena_allocated, arena_committed, arena_dirty, j,
+ arena_unused, arena_headers;
+
+ arena_headers = 0;
+ arena_unused = 0;
+
+ {
+ MutexAutoLock lock(arena->mLock);
+
+ arena_mapped = arena->mStats.mapped;
+
+ // "committed" counts dirty and allocated memory.
+ arena_committed = arena->mStats.committed << gPageSize2Pow;
+
+ arena_allocated =
+ arena->mStats.allocated_small + arena->mStats.allocated_large;
+
+ arena_dirty = arena->mNumDirty << gPageSize2Pow;
+
+ for (j = 0; j < NUM_SMALL_CLASSES; j++) {
+ arena_bin_t* bin = &arena->mBins[j];
+ size_t bin_unused = 0;
+ size_t num_non_full_runs = 0;
+
+ for (auto mapelm : bin->mNonFullRuns.iter()) {
+ arena_run_t* run = (arena_run_t*)(mapelm->bits & ~gPageSizeMask);
+ bin_unused += run->mNumFree * bin->mSizeClass;
+ num_non_full_runs++;
+ }
+
+ if (bin->mCurrentRun) {
+ bin_unused += bin->mCurrentRun->mNumFree * bin->mSizeClass;
+ num_non_full_runs++;
+ }
+
+ arena_unused += bin_unused;
+ arena_headers += bin->mNumRuns * bin->mRunFirstRegionOffset;
+ if (aBinStats) {
+ aBinStats[j].size = bin->mSizeClass;
+ aBinStats[j].num_non_full_runs += num_non_full_runs;
+ aBinStats[j].num_runs += bin->mNumRuns;
+ aBinStats[j].bytes_unused += bin_unused;
+ size_t bytes_per_run = static_cast<size_t>(bin->mRunSizePages)
+ << gPageSize2Pow;
+ aBinStats[j].bytes_total +=
+ bin->mNumRuns * (bytes_per_run - bin->mRunFirstRegionOffset);
+ aBinStats[j].bytes_per_run = bytes_per_run;
+ }
+ }
+ }
+
+ MOZ_ASSERT(arena_mapped >= arena_committed);
+ MOZ_ASSERT(arena_committed >= arena_allocated + arena_dirty);
+
+ aStats->mapped += arena_mapped;
+ aStats->allocated += arena_allocated;
+ aStats->page_cache += arena_dirty;
+ // "waste" is committed memory that is neither dirty nor
+ // allocated. If you change this definition please update
+ // memory/replace/logalloc/replay/Replay.cpp's jemalloc_stats calculation of
+ // committed.
+ aStats->waste += arena_committed - arena_allocated - arena_dirty -
+ arena_unused - arena_headers;
+ aStats->bin_unused += arena_unused;
+ aStats->bookkeeping += arena_headers;
+ aStats->narenas++;
+ }
+ gArenas.mLock.Unlock();
+
+ // Account for arena chunk headers in bookkeeping rather than waste.
+ chunk_header_size =
+ ((aStats->mapped / aStats->chunksize) * gChunkHeaderNumPages)
+ << gPageSize2Pow;
+
+ aStats->mapped += non_arena_mapped;
+ aStats->bookkeeping += chunk_header_size;
+ aStats->waste -= chunk_header_size;
+
+ MOZ_ASSERT(aStats->mapped >= aStats->allocated + aStats->waste +
+ aStats->page_cache + aStats->bookkeeping);
+}
+
+template <>
+inline size_t MozJemalloc::jemalloc_stats_num_bins() {
+ return NUM_SMALL_CLASSES;
+}
+
+#ifdef MALLOC_DOUBLE_PURGE
+
+// Explicitly remove all of this chunk's MADV_FREE'd pages from memory.
+static void hard_purge_chunk(arena_chunk_t* aChunk) {
+ // See similar logic in arena_t::Purge().
+ for (size_t i = gChunkHeaderNumPages; i < gChunkNumPages; i++) {
+ // Find all adjacent pages with CHUNK_MAP_MADVISED set.
+ size_t npages;
+ for (npages = 0; aChunk->map[i + npages].bits & CHUNK_MAP_MADVISED &&
+ i + npages < gChunkNumPages;
+ npages++) {
+ // Turn off the chunk's MADV_FREED bit and turn on its
+ // DECOMMITTED bit.
+ MOZ_DIAGNOSTIC_ASSERT(
+ !(aChunk->map[i + npages].bits & CHUNK_MAP_DECOMMITTED));
+ aChunk->map[i + npages].bits ^= CHUNK_MAP_MADVISED_OR_DECOMMITTED;
+ }
+
+ // We could use mincore to find out which pages are actually
+ // present, but it's not clear that's better.
+ if (npages > 0) {
+ pages_decommit(((char*)aChunk) + (i << gPageSize2Pow),
+ npages << gPageSize2Pow);
+ Unused << pages_commit(((char*)aChunk) + (i << gPageSize2Pow),
+ npages << gPageSize2Pow);
+ }
+ i += npages;
+ }
+}
+
+// Explicitly remove all of this arena's MADV_FREE'd pages from memory.
+void arena_t::HardPurge() {
+ MutexAutoLock lock(mLock);
+
+ while (!mChunksMAdvised.isEmpty()) {
+ arena_chunk_t* chunk = mChunksMAdvised.popFront();
+ hard_purge_chunk(chunk);
+ }
+}
+
+template <>
+inline void MozJemalloc::jemalloc_purge_freed_pages() {
+ if (malloc_initialized) {
+ MutexAutoLock lock(gArenas.mLock);
+ for (auto arena : gArenas.iter()) {
+ arena->HardPurge();
+ }
+ }
+}
+
+#else // !defined MALLOC_DOUBLE_PURGE
+
+template <>
+inline void MozJemalloc::jemalloc_purge_freed_pages() {
+ // Do nothing.
+}
+
+#endif // defined MALLOC_DOUBLE_PURGE
+
+template <>
+inline void MozJemalloc::jemalloc_free_dirty_pages(void) {
+ if (malloc_initialized) {
+ MutexAutoLock lock(gArenas.mLock);
+ for (auto arena : gArenas.iter()) {
+ MutexAutoLock arena_lock(arena->mLock);
+ arena->Purge(1);
+ }
+ }
+}
+
+inline arena_t* ArenaCollection::GetByIdInternal(arena_id_t aArenaId,
+ bool aIsPrivate) {
+ // Use AlignedStorage2 to avoid running the arena_t constructor, while
+ // we only need it as a placeholder for mId.
+ mozilla::AlignedStorage2<arena_t> key;
+ key.addr()->mId = aArenaId;
+ return (aIsPrivate ? mPrivateArenas : mArenas).Search(key.addr());
+}
+
+inline arena_t* ArenaCollection::GetById(arena_id_t aArenaId, bool aIsPrivate) {
+ if (!malloc_initialized) {
+ return nullptr;
+ }
+
+ MutexAutoLock lock(mLock);
+ arena_t* result = GetByIdInternal(aArenaId, aIsPrivate);
+ MOZ_RELEASE_ASSERT(result);
+ return result;
+}
+
+template <>
+inline arena_id_t MozJemalloc::moz_create_arena_with_params(
+ arena_params_t* aParams) {
+ if (malloc_init()) {
+ arena_t* arena = gArenas.CreateArena(/* IsPrivate = */ true, aParams);
+ return arena->mId;
+ }
+ return 0;
+}
+
+template <>
+inline void MozJemalloc::moz_dispose_arena(arena_id_t aArenaId) {
+ arena_t* arena = gArenas.GetById(aArenaId, /* IsPrivate = */ true);
+ MOZ_RELEASE_ASSERT(arena);
+ gArenas.DisposeArena(arena);
+}
+
+template <>
+inline void MozJemalloc::moz_set_max_dirty_page_modifier(int32_t aModifier) {
+ gArenas.SetDefaultMaxDirtyPageModifier(aModifier);
+}
+
+#define MALLOC_DECL(name, return_type, ...) \
+ template <> \
+ inline return_type MozJemalloc::moz_arena_##name( \
+ arena_id_t aArenaId, ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) { \
+ BaseAllocator allocator( \
+ gArenas.GetById(aArenaId, /* IsPrivate = */ true)); \
+ return allocator.name(ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
+ }
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
+#include "malloc_decls.h"
+
+// End non-standard functions.
+// ***************************************************************************
+#ifndef XP_WIN
+// Begin library-private functions, used by threading libraries for protection
+// of malloc during fork(). These functions are only called if the program is
+// running in threaded mode, so there is no need to check whether the program
+// is threaded here.
+FORK_HOOK
+void _malloc_prefork(void) MOZ_NO_THREAD_SAFETY_ANALYSIS {
+ // Acquire all mutexes in a safe order.
+ gArenas.mLock.Lock();
+
+ for (auto arena : gArenas.iter()) {
+ arena->mLock.Lock();
+ }
+
+ base_mtx.Lock();
+
+ huge_mtx.Lock();
+}
+
+FORK_HOOK
+void _malloc_postfork_parent(void) MOZ_NO_THREAD_SAFETY_ANALYSIS {
+ // Release all mutexes, now that fork() has completed.
+ huge_mtx.Unlock();
+
+ base_mtx.Unlock();
+
+ for (auto arena : gArenas.iter()) {
+ arena->mLock.Unlock();
+ }
+
+ gArenas.mLock.Unlock();
+}
+
+FORK_HOOK
+void _malloc_postfork_child(void) {
+ // Reinitialize all mutexes, now that fork() has completed.
+ huge_mtx.Init();
+
+ base_mtx.Init();
+
+ for (auto arena : gArenas.iter()) {
+ arena->mLock.Init();
+ }
+
+ gArenas.mLock.Init();
+}
+#endif // XP_WIN
+
+// End library-private functions.
+// ***************************************************************************
+#ifdef MOZ_REPLACE_MALLOC
+// Windows doesn't come with weak imports as they are possible with
+// LD_PRELOAD or DYLD_INSERT_LIBRARIES on Linux/OSX. On this platform,
+// the replacement functions are defined as variable pointers to the
+// function resolved with GetProcAddress() instead of weak definitions
+// of functions. On Android, the same needs to happen as well, because
+// the Android linker doesn't handle weak linking with non LD_PRELOADed
+// libraries, but LD_PRELOADing is not very convenient on Android, with
+// the zygote.
+# ifdef XP_DARWIN
+# define MOZ_REPLACE_WEAK __attribute__((weak_import))
+# elif defined(XP_WIN) || defined(ANDROID)
+# define MOZ_DYNAMIC_REPLACE_INIT
+# define replace_init replace_init_decl
+# elif defined(__GNUC__)
+# define MOZ_REPLACE_WEAK __attribute__((weak))
+# endif
+
+# include "replace_malloc.h"
+
+# define MALLOC_DECL(name, return_type, ...) MozJemalloc::name,
+
+// The default malloc table, i.e. plain allocations. It never changes. It's
+// used by init(), and not used after that.
+static const malloc_table_t gDefaultMallocTable = {
+# include "malloc_decls.h"
+};
+
+// The malloc table installed by init(). It never changes from that point
+// onward. It will be the same as gDefaultMallocTable if no replace-malloc tool
+// is enabled at startup.
+static malloc_table_t gOriginalMallocTable = {
+# include "malloc_decls.h"
+};
+
+// The malloc table installed by jemalloc_replace_dynamic(). (Read the
+// comments above that function for more details.)
+static malloc_table_t gDynamicMallocTable = {
+# include "malloc_decls.h"
+};
+
+// This briefly points to gDefaultMallocTable at startup. After that, it points
+// to either gOriginalMallocTable or gDynamicMallocTable. It's atomic to avoid
+// races when switching between tables.
+static Atomic<malloc_table_t const*, mozilla::MemoryOrdering::Relaxed>
+ gMallocTablePtr;
+
+# ifdef MOZ_DYNAMIC_REPLACE_INIT
+# undef replace_init
+typedef decltype(replace_init_decl) replace_init_impl_t;
+static replace_init_impl_t* replace_init = nullptr;
+# endif
+
+# ifdef XP_WIN
+typedef HMODULE replace_malloc_handle_t;
+
+static replace_malloc_handle_t replace_malloc_handle() {
+ wchar_t replace_malloc_lib[1024];
+ if (GetEnvironmentVariableW(L"MOZ_REPLACE_MALLOC_LIB", replace_malloc_lib,
+ ArrayLength(replace_malloc_lib)) > 0) {
+ return LoadLibraryW(replace_malloc_lib);
+ }
+ return nullptr;
+}
+
+# define REPLACE_MALLOC_GET_INIT_FUNC(handle) \
+ (replace_init_impl_t*)GetProcAddress(handle, "replace_init")
+
+# elif defined(ANDROID)
+# include <dlfcn.h>
+
+typedef void* replace_malloc_handle_t;
+
+static replace_malloc_handle_t replace_malloc_handle() {
+ const char* replace_malloc_lib = getenv("MOZ_REPLACE_MALLOC_LIB");
+ if (replace_malloc_lib && *replace_malloc_lib) {
+ return dlopen(replace_malloc_lib, RTLD_LAZY);
+ }
+ return nullptr;
+}
+
+# define REPLACE_MALLOC_GET_INIT_FUNC(handle) \
+ (replace_init_impl_t*)dlsym(handle, "replace_init")
+
+# endif
+
+static void replace_malloc_init_funcs(malloc_table_t*);
+
+# ifdef MOZ_REPLACE_MALLOC_STATIC
+extern "C" void logalloc_init(malloc_table_t*, ReplaceMallocBridge**);
+
+extern "C" void dmd_init(malloc_table_t*, ReplaceMallocBridge**);
+
+extern "C" void phc_init(malloc_table_t*, ReplaceMallocBridge**);
+# endif
+
+bool Equals(const malloc_table_t& aTable1, const malloc_table_t& aTable2) {
+ return memcmp(&aTable1, &aTable2, sizeof(malloc_table_t)) == 0;
+}
+
+// Below is the malloc implementation overriding jemalloc and calling the
+// replacement functions if they exist.
+static ReplaceMallocBridge* gReplaceMallocBridge = nullptr;
+static void init() {
+ malloc_table_t tempTable = gDefaultMallocTable;
+
+# ifdef MOZ_DYNAMIC_REPLACE_INIT
+ replace_malloc_handle_t handle = replace_malloc_handle();
+ if (handle) {
+ replace_init = REPLACE_MALLOC_GET_INIT_FUNC(handle);
+ }
+# endif
+
+ // Set this *before* calling replace_init, otherwise if replace_init calls
+ // malloc() we'll get an infinite loop.
+ gMallocTablePtr = &gDefaultMallocTable;
+
+ // Pass in the default allocator table so replace functions can copy and use
+ // it for their allocations. The replace_init() function should modify the
+ // table if it wants to be active, otherwise leave it unmodified.
+ if (replace_init) {
+ replace_init(&tempTable, &gReplaceMallocBridge);
+ }
+# ifdef MOZ_REPLACE_MALLOC_STATIC
+ if (Equals(tempTable, gDefaultMallocTable)) {
+ logalloc_init(&tempTable, &gReplaceMallocBridge);
+ }
+# ifdef MOZ_DMD
+ if (Equals(tempTable, gDefaultMallocTable)) {
+ dmd_init(&tempTable, &gReplaceMallocBridge);
+ }
+# endif
+# ifdef MOZ_PHC
+ if (Equals(tempTable, gDefaultMallocTable)) {
+ phc_init(&tempTable, &gReplaceMallocBridge);
+ }
+# endif
+# endif
+ if (!Equals(tempTable, gDefaultMallocTable)) {
+ replace_malloc_init_funcs(&tempTable);
+ }
+ gOriginalMallocTable = tempTable;
+ gMallocTablePtr = &gOriginalMallocTable;
+}
+
+// WARNING WARNING WARNING: this function should be used with extreme care. It
+// is not as general-purpose as it looks. It is currently used by
+// tools/profiler/core/memory_hooks.cpp for counting allocations and probably
+// should not be used for any other purpose.
+//
+// This function allows the original malloc table to be temporarily replaced by
+// a different malloc table. Or, if the argument is nullptr, it switches back to
+// the original malloc table.
+//
+// Limitations:
+//
+// - It is not threadsafe. If multiple threads pass it the same
+// `replace_init_func` at the same time, there will be data races writing to
+// the malloc_table_t within that function.
+//
+// - Only one replacement can be installed. No nesting is allowed.
+//
+// - The new malloc table must be able to free allocations made by the original
+// malloc table, and upon removal the original malloc table must be able to
+// free allocations made by the new malloc table. This means the new malloc
+// table can only do simple things like recording extra information, while
+// delegating actual allocation/free operations to the original malloc table.
+//
+MOZ_JEMALLOC_API void jemalloc_replace_dynamic(
+ jemalloc_init_func replace_init_func) {
+ if (replace_init_func) {
+ malloc_table_t tempTable = gOriginalMallocTable;
+ (*replace_init_func)(&tempTable, &gReplaceMallocBridge);
+ if (!Equals(tempTable, gOriginalMallocTable)) {
+ replace_malloc_init_funcs(&tempTable);
+
+ // Temporarily switch back to the original malloc table. In the
+ // (supported) non-nested case, this is a no-op. But just in case this is
+ // a (unsupported) nested call, it makes the overwriting of
+ // gDynamicMallocTable less racy, because ongoing calls to malloc() and
+ // friends won't go through gDynamicMallocTable.
+ gMallocTablePtr = &gOriginalMallocTable;
+
+ gDynamicMallocTable = tempTable;
+ gMallocTablePtr = &gDynamicMallocTable;
+ // We assume that dynamic replaces don't occur close enough for a
+ // thread to still have old copies of the table pointer when the 2nd
+ // replace occurs.
+ }
+ } else {
+ // Switch back to the original malloc table.
+ gMallocTablePtr = &gOriginalMallocTable;
+ }
+}
+
+# define MALLOC_DECL(name, return_type, ...) \
+ template <> \
+ inline return_type ReplaceMalloc::name( \
+ ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) { \
+ if (MOZ_UNLIKELY(!gMallocTablePtr)) { \
+ init(); \
+ } \
+ return (*gMallocTablePtr).name(ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
+ }
+# include "malloc_decls.h"
+
+MOZ_JEMALLOC_API struct ReplaceMallocBridge* get_bridge(void) {
+ if (MOZ_UNLIKELY(!gMallocTablePtr)) {
+ init();
+ }
+ return gReplaceMallocBridge;
+}
+
+// posix_memalign, aligned_alloc, memalign and valloc all implement some kind
+// of aligned memory allocation. For convenience, a replace-malloc library can
+// skip defining replace_posix_memalign, replace_aligned_alloc and
+// replace_valloc, and default implementations will be automatically derived
+// from replace_memalign.
+static void replace_malloc_init_funcs(malloc_table_t* table) {
+ if (table->posix_memalign == MozJemalloc::posix_memalign &&
+ table->memalign != MozJemalloc::memalign) {
+ table->posix_memalign =
+ AlignedAllocator<ReplaceMalloc::memalign>::posix_memalign;
+ }
+ if (table->aligned_alloc == MozJemalloc::aligned_alloc &&
+ table->memalign != MozJemalloc::memalign) {
+ table->aligned_alloc =
+ AlignedAllocator<ReplaceMalloc::memalign>::aligned_alloc;
+ }
+ if (table->valloc == MozJemalloc::valloc &&
+ table->memalign != MozJemalloc::memalign) {
+ table->valloc = AlignedAllocator<ReplaceMalloc::memalign>::valloc;
+ }
+ if (table->moz_create_arena_with_params ==
+ MozJemalloc::moz_create_arena_with_params &&
+ table->malloc != MozJemalloc::malloc) {
+# define MALLOC_DECL(name, ...) \
+ table->name = DummyArenaAllocator<ReplaceMalloc>::name;
+# define MALLOC_FUNCS MALLOC_FUNCS_ARENA_BASE
+# include "malloc_decls.h"
+ }
+ if (table->moz_arena_malloc == MozJemalloc::moz_arena_malloc &&
+ table->malloc != MozJemalloc::malloc) {
+# define MALLOC_DECL(name, ...) \
+ table->name = DummyArenaAllocator<ReplaceMalloc>::name;
+# define MALLOC_FUNCS MALLOC_FUNCS_ARENA_ALLOC
+# include "malloc_decls.h"
+ }
+}
+
+#endif // MOZ_REPLACE_MALLOC
+// ***************************************************************************
+// Definition of all the _impl functions
+// GENERIC_MALLOC_DECL2_MINGW is only used for the MinGW build, and aliases
+// the malloc funcs (e.g. malloc) to the je_ versions. It does not generate
+// aliases for the other functions (jemalloc and arena functions).
+//
+// We do need aliases for the other mozglue.def-redirected functions though,
+// these are done at the bottom of mozmemory_wrap.cpp
+#define GENERIC_MALLOC_DECL2_MINGW(name, name_impl, return_type, ...) \
+ return_type name(ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) \
+ __attribute__((alias(MOZ_STRINGIFY(name_impl))));
+
+#define GENERIC_MALLOC_DECL2(attributes, name, name_impl, return_type, ...) \
+ return_type name_impl(ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) attributes { \
+ return DefaultMalloc::name(ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
+ }
+
+#ifndef __MINGW32__
+# define GENERIC_MALLOC_DECL(attributes, name, return_type, ...) \
+ GENERIC_MALLOC_DECL2(attributes, name, name##_impl, return_type, \
+ ##__VA_ARGS__)
+#else
+# define GENERIC_MALLOC_DECL(attributes, name, return_type, ...) \
+ GENERIC_MALLOC_DECL2(attributes, name, name##_impl, return_type, \
+ ##__VA_ARGS__) \
+ GENERIC_MALLOC_DECL2_MINGW(name, name##_impl, return_type, ##__VA_ARGS__)
+#endif
+
+#define NOTHROW_MALLOC_DECL(...) \
+ MOZ_MEMORY_API MACRO_CALL(GENERIC_MALLOC_DECL, (noexcept(true), __VA_ARGS__))
+#define MALLOC_DECL(...) \
+ MOZ_MEMORY_API MACRO_CALL(GENERIC_MALLOC_DECL, (, __VA_ARGS__))
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+#include "malloc_decls.h"
+
+#undef GENERIC_MALLOC_DECL
+#define GENERIC_MALLOC_DECL(attributes, name, return_type, ...) \
+ GENERIC_MALLOC_DECL2(attributes, name, name, return_type, ##__VA_ARGS__)
+
+#define MALLOC_DECL(...) \
+ MOZ_JEMALLOC_API MACRO_CALL(GENERIC_MALLOC_DECL, (, __VA_ARGS__))
+#define MALLOC_FUNCS (MALLOC_FUNCS_JEMALLOC | MALLOC_FUNCS_ARENA)
+#include "malloc_decls.h"
+// ***************************************************************************
+
+#ifdef HAVE_DLOPEN
+# include <dlfcn.h>
+#endif
+
+#if defined(__GLIBC__) && !defined(__UCLIBC__)
+// glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible
+// to inconsistently reference libc's malloc(3)-compatible functions
+// (bug 493541).
+//
+// These definitions interpose hooks in glibc. The functions are actually
+// passed an extra argument for the caller return address, which will be
+// ignored.
+
+extern "C" {
+MOZ_EXPORT void (*__free_hook)(void*) = free_impl;
+MOZ_EXPORT void* (*__malloc_hook)(size_t) = malloc_impl;
+MOZ_EXPORT void* (*__realloc_hook)(void*, size_t) = realloc_impl;
+MOZ_EXPORT void* (*__memalign_hook)(size_t, size_t) = memalign_impl;
+}
+
+#elif defined(RTLD_DEEPBIND)
+// XXX On systems that support RTLD_GROUP or DF_1_GROUP, do their
+// implementations permit similar inconsistencies? Should STV_SINGLETON
+// visibility be used for interposition where available?
+# error \
+ "Interposing malloc is unsafe on this system without libc malloc hooks."
+#endif
+
+#ifdef XP_WIN
+MOZ_EXPORT void* _recalloc(void* aPtr, size_t aCount, size_t aSize) {
+ size_t oldsize = aPtr ? AllocInfo::Get(aPtr).Size() : 0;
+ CheckedInt<size_t> checkedSize = CheckedInt<size_t>(aCount) * aSize;
+
+ if (!checkedSize.isValid()) {
+ return nullptr;
+ }
+
+ size_t newsize = checkedSize.value();
+
+ // In order for all trailing bytes to be zeroed, the caller needs to
+ // use calloc(), followed by recalloc(). However, the current calloc()
+ // implementation only zeros the bytes requested, so if recalloc() is
+ // to work 100% correctly, calloc() will need to change to zero
+ // trailing bytes.
+ aPtr = DefaultMalloc::realloc(aPtr, newsize);
+ if (aPtr && oldsize < newsize) {
+ memset((void*)((uintptr_t)aPtr + oldsize), 0, newsize - oldsize);
+ }
+
+ return aPtr;
+}
+
+// This impl of _expand doesn't ever actually expand or shrink blocks: it
+// simply replies that you may continue using a shrunk block.
+MOZ_EXPORT void* _expand(void* aPtr, size_t newsize) {
+ if (AllocInfo::Get(aPtr).Size() >= newsize) {
+ return aPtr;
+ }
+
+ return nullptr;
+}
+
+MOZ_EXPORT size_t _msize(void* aPtr) {
+ return DefaultMalloc::malloc_usable_size(aPtr);
+}
+#endif
diff --git a/memory/build/mozjemalloc.h b/memory/build/mozjemalloc.h
new file mode 100644
index 0000000000..a74c3b2ec6
--- /dev/null
+++ b/memory/build/mozjemalloc.h
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozjemalloc_h
+#define mozjemalloc_h
+
+#include "mozjemalloc_types.h"
+#include "mozilla/MacroArgs.h"
+
+// Macro helpers
+
+#define MACRO_CALL(a, b) a b
+// Can't use macros recursively, so we need another one doing the same as above.
+#define MACRO_CALL2(a, b) a b
+
+#define ARGS_HELPER(name, ...) \
+ MACRO_CALL2(MOZ_PASTE_PREFIX_AND_ARG_COUNT(name, ##__VA_ARGS__), \
+ (__VA_ARGS__))
+#define TYPED_ARGS0()
+#define TYPED_ARGS1(t1) t1 arg1
+#define TYPED_ARGS2(t1, t2) TYPED_ARGS1(t1), t2 arg2
+#define TYPED_ARGS3(t1, t2, t3) TYPED_ARGS2(t1, t2), t3 arg3
+
+#define ARGS0()
+#define ARGS1(t1) arg1
+#define ARGS2(t1, t2) ARGS1(t1), arg2
+#define ARGS3(t1, t2, t3) ARGS2(t1, t2), arg3
+
+#ifdef MOZ_MEMORY
+
+// Generic interface exposing the whole public allocator API
+// This facilitates the implementation of things like replace-malloc.
+// Note: compilers are expected to be able to optimize out `this`.
+template <typename T>
+struct Allocator : public T {
+# define MALLOC_DECL(name, return_type, ...) \
+ static return_type name(__VA_ARGS__);
+# include "malloc_decls.h"
+};
+
+// The MozJemalloc allocator
+struct MozJemallocBase {};
+typedef Allocator<MozJemallocBase> MozJemalloc;
+
+# ifdef MOZ_REPLACE_MALLOC
+// The replace-malloc allocator
+struct ReplaceMallocBase {};
+typedef Allocator<ReplaceMallocBase> ReplaceMalloc;
+
+typedef ReplaceMalloc DefaultMalloc;
+# else
+typedef MozJemalloc DefaultMalloc;
+# endif
+
+#endif // MOZ_MEMORY
+
+// Dummy implementation of the moz_arena_* API, falling back to a given
+// implementation of the base allocator.
+template <typename T>
+struct DummyArenaAllocator {
+ static arena_id_t moz_create_arena_with_params(arena_params_t*) { return 0; }
+
+ static void moz_dispose_arena(arena_id_t) {}
+
+ static void moz_set_max_dirty_page_modifier(int32_t) {}
+
+#define MALLOC_DECL(name, return_type, ...) \
+ static return_type moz_arena_##name( \
+ arena_id_t, ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) { \
+ return T::name(ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
+ }
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
+#include "malloc_decls.h"
+};
+
+#endif
diff --git a/memory/build/mozjemalloc_types.h b/memory/build/mozjemalloc_types.h
new file mode 100644
index 0000000000..1ab2ce0b71
--- /dev/null
+++ b/memory/build/mozjemalloc_types.h
@@ -0,0 +1,193 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Portions of this file were originally under the following license:
+//
+// Copyright (C) 2006-2008 Jason Evans <jasone@FreeBSD.org>.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+// notice(s), this list of conditions and the following disclaimer as
+// the first lines of this file unmodified other than the possible
+// addition of one or more copyright notices.
+// 2. Redistributions in binary form must reproduce the above copyright
+// notice(s), this list of conditions and the following disclaimer in
+// the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef _JEMALLOC_TYPES_H_
+#define _JEMALLOC_TYPES_H_
+
+#include <stdint.h>
+
+// grab size_t
+#ifdef _MSC_VER
+# include <crtdefs.h>
+#else
+# include <stddef.h>
+#endif
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef MALLOC_USABLE_SIZE_CONST_PTR
+# define MALLOC_USABLE_SIZE_CONST_PTR const
+#endif
+
+typedef MALLOC_USABLE_SIZE_CONST_PTR void* usable_ptr_t;
+
+typedef size_t arena_id_t;
+
+#define ARENA_FLAG_RANDOMIZE_SMALL_MASK 0x3
+#define ARENA_FLAG_RANDOMIZE_SMALL_DEFAULT 0
+#define ARENA_FLAG_RANDOMIZE_SMALL_ENABLED 1
+#define ARENA_FLAG_RANDOMIZE_SMALL_DISABLED 2
+
+typedef struct arena_params_s {
+ size_t mMaxDirty;
+ // Arena specific modifiers which override the value passed to
+ // moz_set_max_dirty_page_modifier. If value > 0 is passed to that function,
+ // and mMaxDirtyIncreaseOverride != 0, mMaxDirtyIncreaseOverride will be used
+ // instead, and similarly if value < 0 is passed and mMaxDirtyDecreaseOverride
+ // != 0, mMaxDirtyDecreaseOverride will be used as the modifier.
+ int32_t mMaxDirtyIncreaseOverride;
+ int32_t mMaxDirtyDecreaseOverride;
+
+ uint32_t mFlags;
+
+#ifdef __cplusplus
+ arena_params_s()
+ : mMaxDirty(0),
+ mMaxDirtyIncreaseOverride(0),
+ mMaxDirtyDecreaseOverride(0),
+ mFlags(0) {}
+#endif
+} arena_params_t;
+
+// jemalloc_stats() is not a stable interface. When using jemalloc_stats_t, be
+// sure that the compiled results of jemalloc.c are in sync with this header
+// file.
+typedef struct {
+ // Run-time configuration settings.
+ bool opt_junk; // Fill allocated memory with kAllocJunk?
+ bool opt_zero; // Fill allocated memory with 0x0?
+ size_t narenas; // Number of arenas.
+ size_t quantum; // Allocation quantum.
+ size_t quantum_max; // Max quantum-spaced allocation size.
+ size_t quantum_wide; // Allocation quantum (QuantuWide).
+ size_t quantum_wide_max; // Max quantum-wide-spaced allocation size.
+ size_t subpage_max; // Max subpage allocation size.
+ size_t large_max; // Max sub-chunksize allocation size.
+ size_t chunksize; // Size of each virtual memory mapping.
+ size_t page_size; // Size of pages.
+ size_t dirty_max; // Max dirty pages per arena.
+
+ // Current memory usage statistics.
+ size_t mapped; // Bytes mapped (not necessarily committed).
+ size_t allocated; // Bytes allocated (committed, in use by application).
+ size_t waste; // Bytes committed, not in use by the
+ // application, and not intentionally left
+ // unused (i.e., not dirty).
+ size_t page_cache; // Committed, unused pages kept around as a
+ // cache. (jemalloc calls these "dirty".)
+ size_t bookkeeping; // Committed bytes used internally by the
+ // allocator.
+ size_t bin_unused; // Bytes committed to a bin but currently unused.
+} jemalloc_stats_t;
+
+typedef struct {
+ size_t size; // The size of objects in this bin, zero if this
+ // bin stats array entry is unused (no more bins).
+ size_t num_non_full_runs; // The number of non-full runs
+ size_t num_runs; // The number of runs in this bin
+ size_t bytes_unused; // The unallocated bytes across all these bins
+ size_t bytes_total; // The total storage area for runs in this bin,
+ size_t bytes_per_run; // The number of bytes per run, including headers.
+} jemalloc_bin_stats_t;
+
+enum PtrInfoTag {
+ // The pointer is not currently known to the allocator.
+ // 'addr', 'size', and 'arenaId' are always 0.
+ TagUnknown,
+
+ // The pointer is within a live allocation.
+ // 'addr', 'size', and 'arenaId' describe the allocation.
+ TagLiveAlloc,
+
+ // The pointer is within a small freed allocation.
+ // 'addr', 'size', and 'arenaId' describe the allocation.
+ TagFreedAlloc,
+
+ // The pointer is within a freed page. Details about the original
+ // allocation, including its size, are not available.
+ // 'addr', 'size', and 'arenaId' describe the page.
+ TagFreedPage,
+};
+
+// The information in jemalloc_ptr_info_t could be represented in a variety of
+// ways. The chosen representation has the following properties.
+// - The number of fields is minimized.
+// - The 'tag' field unambiguously defines the meaning of the subsequent fields.
+// Helper functions are used to group together related categories of tags.
+typedef struct jemalloc_ptr_info_s {
+ enum PtrInfoTag tag;
+ void* addr; // meaning depends on tag; see above
+ size_t size; // meaning depends on tag; see above
+
+#ifdef MOZ_DEBUG
+ arena_id_t arenaId; // meaning depends on tag; see above
+#endif
+
+#ifdef __cplusplus
+ jemalloc_ptr_info_s() = default;
+ jemalloc_ptr_info_s(enum PtrInfoTag aTag, void* aAddr, size_t aSize,
+ arena_id_t aArenaId)
+ : tag(aTag),
+ addr(aAddr),
+ size(aSize)
+# ifdef MOZ_DEBUG
+ ,
+ arenaId(aArenaId)
+# endif
+ {
+ }
+#endif
+} jemalloc_ptr_info_t;
+
+static inline bool jemalloc_ptr_is_live(jemalloc_ptr_info_t* info) {
+ return info->tag == TagLiveAlloc;
+}
+
+static inline bool jemalloc_ptr_is_freed(jemalloc_ptr_info_t* info) {
+ return info->tag == TagFreedAlloc || info->tag == TagFreedPage;
+}
+
+static inline bool jemalloc_ptr_is_freed_page(jemalloc_ptr_info_t* info) {
+ return info->tag == TagFreedPage;
+}
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // _JEMALLOC_TYPES_H_
diff --git a/memory/build/mozmemory.h b/memory/build/mozmemory.h
new file mode 100644
index 0000000000..e6ed1a352e
--- /dev/null
+++ b/memory/build/mozmemory.h
@@ -0,0 +1,79 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozmemory_h
+#define mozmemory_h
+
+// This header is meant to be used when the following functions are
+// necessary:
+// - malloc_good_size (used to be called je_malloc_usable_in_advance)
+// - jemalloc_stats
+// - jemalloc_stats_num_bins
+// - jemalloc_purge_freed_pages
+// - jemalloc_free_dirty_pages
+// - jemalloc_thread_local_arena
+// - jemalloc_ptr_info
+
+#ifdef MALLOC_H
+# include MALLOC_H
+#endif
+#include "mozmemory_wrap.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Types.h"
+#include "mozjemalloc_types.h"
+#include "stdbool.h"
+
+#ifdef MOZ_MEMORY
+// On OSX, malloc/malloc.h contains the declaration for malloc_good_size,
+// which will call back in jemalloc, through the zone allocator so just use it.
+# ifndef XP_DARWIN
+MOZ_MEMORY_API size_t malloc_good_size_impl(size_t size);
+
+// Note: the MOZ_GLUE_IN_PROGRAM ifdef below is there to avoid -Werror turning
+// the protective if into errors. MOZ_GLUE_IN_PROGRAM is what triggers MFBT_API
+// to use weak imports.
+static inline size_t _malloc_good_size(size_t size) {
+# if defined(MOZ_GLUE_IN_PROGRAM) && !defined(IMPL_MFBT)
+ if (!malloc_good_size) return size;
+# endif
+ return malloc_good_size_impl(size);
+}
+
+# define malloc_good_size _malloc_good_size
+# endif
+
+# define MALLOC_DECL(name, return_type, ...) \
+ MOZ_JEMALLOC_API return_type name(__VA_ARGS__);
+# define MALLOC_FUNCS MALLOC_FUNCS_JEMALLOC
+# include "malloc_decls.h"
+
+# ifdef __cplusplus
+static inline void jemalloc_stats(jemalloc_stats_t* aStats,
+ jemalloc_bin_stats_t* aBinStats = nullptr) {
+ jemalloc_stats_internal(aStats, aBinStats);
+}
+# else
+static inline void jemalloc_stats(jemalloc_stats_t* aStats) {
+ jemalloc_stats_internal(aStats, NULL);
+}
+# endif
+
+#endif // MOZ_MEMORY
+
+#define NOTHROW_MALLOC_DECL(name, return_type, ...) \
+ MOZ_JEMALLOC_API return_type name(__VA_ARGS__) noexcept(true);
+#define MALLOC_DECL(name, return_type, ...) \
+ MOZ_JEMALLOC_API return_type name(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_ARENA
+#include "malloc_decls.h"
+
+#ifdef __cplusplus
+# define moz_create_arena() moz_create_arena_with_params(nullptr)
+#else
+# define moz_create_arena() moz_create_arena_with_params(NULL)
+#endif
+
+#endif // mozmemory_h
diff --git a/memory/build/mozmemory_utils.h b/memory/build/mozmemory_utils.h
new file mode 100644
index 0000000000..af9e96b4c7
--- /dev/null
+++ b/memory/build/mozmemory_utils.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozjemalloc_utils_h
+#define mozjemalloc_utils_h
+
+#include <optional>
+#include <type_traits>
+
+#if defined(MOZ_MEMORY) && defined(XP_WIN)
+# include "mozmemory_wrap.h"
+#endif
+
+namespace mozilla {
+
+namespace detail {
+// Helper for StallAndRetry error messages.
+template <typename T>
+constexpr bool is_std_optional = false;
+template <typename T>
+constexpr bool is_std_optional<std::optional<T>> = true;
+} // namespace detail
+
+struct StallSpecs {
+ // Maximum number of retry-attempts before giving up.
+ size_t maxAttempts;
+ // Delay time between successive events.
+ size_t delayMs;
+
+ // Retry a fallible operation until it succeeds or until we've run out of
+ // retries.
+ //
+ // Note that this invokes `aDelayFunc` immediately upon being called! It's
+ // intended for use in the unhappy path, after an initial attempt has failed.
+ //
+ // The function type here may be read:
+ // ```
+ // fn StallAndRetry<R>(
+ // delay_func: impl Fn(usize) -> (),
+ // operation: impl Fn() -> Option<R>,
+ // ) -> Option<R>;
+ // ```
+ //
+ template <typename DelayFunc, typename OpFunc>
+ auto StallAndRetry(DelayFunc&& aDelayFunc, OpFunc&& aOperation) const
+ -> decltype(aOperation()) {
+ {
+ // Explicit typecheck for OpFunc, to provide an explicit error message.
+ using detail::is_std_optional;
+ static_assert(is_std_optional<decltype(aOperation())>,
+ "aOperation() must return std::optional");
+
+ // (clang's existing error messages suffice for aDelayFunc.)
+ }
+
+ for (size_t i = 0; i < maxAttempts; ++i) {
+ aDelayFunc(delayMs);
+ if (const auto opt = aOperation()) {
+ return opt;
+ }
+ }
+ return std::nullopt;
+ }
+};
+
+#if defined(MOZ_MEMORY) && defined(XP_WIN)
+MOZ_JEMALLOC_API StallSpecs GetAllocatorStallSpecs();
+#endif
+
+} // namespace mozilla
+
+#endif // mozjemalloc_utils_h
diff --git a/memory/build/mozmemory_wrap.cpp b/memory/build/mozmemory_wrap.cpp
new file mode 100644
index 0000000000..3420fd9693
--- /dev/null
+++ b/memory/build/mozmemory_wrap.cpp
@@ -0,0 +1,145 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <string.h>
+#include "mozmemory_wrap.h"
+#include "mozilla/Types.h"
+
+// Declare malloc implementation functions with the right return and
+// argument types.
+#define NOTHROW_MALLOC_DECL(name, return_type, ...) \
+ MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__) noexcept(true);
+#define MALLOC_DECL(name, return_type, ...) \
+ MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+#include "malloc_decls.h"
+
+// strndup and strdup may be defined as macros in string.h, which would
+// clash with the definitions below.
+#undef strndup
+#undef strdup
+
+MOZ_MEMORY_API char* strndup_impl(const char* src, size_t len) {
+ char* dst = (char*)malloc_impl(len + 1);
+ if (dst) {
+ strncpy(dst, src, len);
+ dst[len] = '\0';
+ }
+ return dst;
+}
+
+MOZ_MEMORY_API char* strdup_impl(const char* src) {
+ size_t len = strlen(src);
+ return strndup_impl(src, len);
+}
+
+#ifdef ANDROID
+# include <stdarg.h>
+# include <stdio.h>
+
+MOZ_MEMORY_API int vasprintf_impl(char** str, const char* fmt, va_list ap) {
+ char *ptr, *_ptr;
+ int ret;
+
+ if (str == NULL || fmt == NULL) {
+ return -1;
+ }
+
+ ptr = (char*)malloc_impl(128);
+ if (ptr == NULL) {
+ *str = NULL;
+ return -1;
+ }
+
+ ret = vsnprintf(ptr, 128, fmt, ap);
+ if (ret < 0) {
+ free_impl(ptr);
+ *str = NULL;
+ return -1;
+ }
+
+ _ptr = reinterpret_cast<char*>(realloc_impl(ptr, ret + 1));
+ if (_ptr == NULL) {
+ free_impl(ptr);
+ *str = NULL;
+ return -1;
+ }
+
+ *str = _ptr;
+
+ return ret;
+}
+
+MOZ_MEMORY_API int asprintf_impl(char** str, const char* fmt, ...) {
+ int ret;
+ va_list ap;
+ va_start(ap, fmt);
+
+ ret = vasprintf_impl(str, fmt, ap);
+
+ va_end(ap);
+
+ return ret;
+}
+#endif
+
+#ifdef XP_WIN
+# include <wchar.h>
+
+// We also need to provide our own impl of wcsdup so that we don't ask
+// the CRT for memory from its heap (which will then be unfreeable).
+MOZ_MEMORY_API wchar_t* wcsdup_impl(const wchar_t* src) {
+ size_t len = wcslen(src);
+ wchar_t* dst = (wchar_t*)malloc_impl((len + 1) * sizeof(wchar_t));
+ if (dst) wcsncpy(dst, src, len + 1);
+ return dst;
+}
+
+MOZ_MEMORY_API void* _aligned_malloc_impl(size_t size, size_t alignment) {
+ return memalign_impl(alignment, size);
+}
+
+# ifdef __MINGW32__
+MOZ_BEGIN_EXTERN_C
+// As in mozjemalloc.cpp, we generate aliases for functions
+// redirected in mozglue.def
+void* _aligned_malloc(size_t size, size_t alignment)
+ __attribute__((alias(MOZ_STRINGIFY(_aligned_malloc_impl))));
+void _aligned_free(void* aPtr) __attribute__((alias(MOZ_STRINGIFY(free_impl))));
+
+char* strndup(const char* src, size_t len)
+ __attribute__((alias(MOZ_STRINGIFY(strdup_impl))));
+char* strdup(const char* src)
+ __attribute__((alias(MOZ_STRINGIFY(strdup_impl))));
+char* _strdup(const char* src)
+ __attribute__((alias(MOZ_STRINGIFY(strdup_impl))));
+wchar_t* wcsdup(const wchar_t* src)
+ __attribute__((alias(MOZ_STRINGIFY(wcsdup_impl))));
+wchar_t* _wcsdup(const wchar_t* src)
+ __attribute__((alias(MOZ_STRINGIFY(wcsdup_impl))));
+
+// jemalloc has _aligned_malloc, and friends. libc++.a contains
+// references to __imp__aligned_malloc (and friends) because it
+// is declared dllimport in the headers.
+//
+// The linker sees jemalloc's _aligned_malloc symbol in our objects,
+// but then libc++.a comes along and needs __imp__aligned_malloc, which
+// pulls in those parts of libucrt.a (or libmsvcrt.a in practice),
+// which define both __imp__aligned_malloc and _aligned_malloc, and
+// this causes a conflict. (And repeat for each of the symbols defined
+// here.)
+//
+// The fix is to define not only an _aligned_malloc symbol (via an
+// alias), but also define the __imp__aligned_malloc pointer to it.
+// This prevents those parts of libucrt from being pulled in and causing
+// conflicts.
+// This is done with __MINGW_IMP_SYMBOL to handle x86/x64 differences.
+void (*__MINGW_IMP_SYMBOL(_aligned_free))(void*) = _aligned_free;
+void* (*__MINGW_IMP_SYMBOL(_aligned_malloc))(size_t, size_t) = _aligned_malloc;
+char* (*__MINGW_IMP_SYMBOL(_strdup))(const char* src) = _strdup;
+MOZ_END_EXTERN_C
+# endif
+#endif // XP_WIN
diff --git a/memory/build/mozmemory_wrap.h b/memory/build/mozmemory_wrap.h
new file mode 100644
index 0000000000..92d0a1176a
--- /dev/null
+++ b/memory/build/mozmemory_wrap.h
@@ -0,0 +1,166 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozmemory_wrap_h
+#define mozmemory_wrap_h
+
+// This header contains #defines which tweak the names of various memory
+// allocation functions.
+//
+// There are several types of functions related to memory allocation
+// that are meant to be used publicly by the Gecko codebase:
+//
+// - malloc implementation functions:
+// - malloc
+// - posix_memalign
+// - aligned_alloc
+// - calloc
+// - realloc
+// - free
+// - memalign
+// - valloc
+// - malloc_usable_size
+// - malloc_good_size
+// Some of these functions are specific to some systems, but for
+// convenience, they are treated as being cross-platform, and available
+// as such.
+//
+// - duplication functions:
+// - strndup
+// - strdup
+// - wcsdup (Windows only)
+//
+// - jemalloc specific functions:
+// - jemalloc_stats
+// - jemalloc_stats_num_bins
+// - jemalloc_purge_freed_pages
+// - jemalloc_free_dirty_pages
+// - jemalloc_thread_local_arena
+// - jemalloc_ptr_info
+// (these functions are native to mozjemalloc)
+//
+// These functions are all exported as part of libmozglue (see
+// $(topsrcdir)/mozglue/build/Makefile.in), with a few implementation
+// peculiarities:
+//
+// - On Windows, the malloc implementation functions are all prefixed with
+// "je_", the duplication functions are prefixed with "wrap_", and jemalloc
+// specific functions are left unprefixed. All these functions are however
+// aliased when exporting them, such that the resulting mozglue.dll exports
+// them unprefixed (see $(topsrcdir)/mozglue/build/mozglue.def.in). The
+// prefixed malloc implementation and duplication functions are not
+// exported.
+//
+// - On MacOSX, the system libc has a zone allocator, which allows us to
+// hook custom malloc implementation functions without exporting them.
+// However, since we want things in Firefox to skip the system zone
+// allocator, the malloc implementation functions are all exported
+// unprefixed, as well as duplication functions.
+// Jemalloc-specific functions are also left unprefixed.
+//
+// - On Android all functions are left unprefixed.
+//
+// - On other systems (mostly Linux), all functions are left unprefixed.
+//
+// On all platforms, C++ allocation functions are also exported.
+//
+// Proper exporting of the various functions is done with the MOZ_MEMORY_API
+// and MOZ_JEMALLOC_API macros. MOZ_MEMORY_API is meant to be used for malloc
+// implementation and duplication functions, while MOZ_JEMALLOC_API is
+// dedicated to jemalloc specific functions.
+//
+//
+// All these functions are meant to be called with no prefix from Gecko code.
+// In most cases, this is because that's how they are available at runtime.
+// However, on Android, this relies on faulty.lib (the custom dynamic linker)
+// resolving mozglue symbols before libc symbols, which is guaranteed by the
+// way faulty.lib works (it respects the DT_NEEDED order, and libc always
+// appears after mozglue ; which we double check when building anyways)
+//
+//
+// Within libmozglue (when MOZ_MEMORY_IMPL is defined), all the functions
+// should be suffixed with "_impl" both for declarations and use.
+// That is, the implementation declaration for e.g. strdup would look like:
+// char* strdup_impl(const char *)
+// That implementation would call malloc by using "malloc_impl".
+
+#if defined(MOZ_MEMORY_IMPL) && !defined(IMPL_MFBT)
+# ifdef MFBT_API // mozilla/Types.h was already included
+# error mozmemory_wrap.h has to be included before mozilla/Types.h when MOZ_MEMORY_IMPL is set and IMPL_MFBT is not.
+# endif
+# define IMPL_MFBT
+#endif
+
+#include "mozilla/Types.h"
+
+#ifndef MOZ_EXTERN_C
+# ifdef __cplusplus
+# define MOZ_EXTERN_C extern "C"
+# else
+# define MOZ_EXTERN_C
+# endif
+#endif
+
+#ifdef MOZ_MEMORY_IMPL
+# define MOZ_JEMALLOC_API MOZ_EXTERN_C MFBT_API
+# if defined(XP_WIN)
+# define mozmem_malloc_impl(a) je_##a
+# else
+# define MOZ_MEMORY_API MOZ_EXTERN_C MFBT_API
+# endif
+#endif
+#ifdef XP_WIN
+# define mozmem_dup_impl(a) wrap_##a
+#endif
+
+#if !defined(MOZ_MEMORY_IMPL)
+# define MOZ_MEMORY_API MOZ_EXTERN_C MFBT_API
+# define MOZ_JEMALLOC_API MOZ_EXTERN_C MFBT_API
+#endif
+
+#ifndef MOZ_MEMORY_API
+# define MOZ_MEMORY_API MOZ_EXTERN_C
+#endif
+#ifndef MOZ_JEMALLOC_API
+# define MOZ_JEMALLOC_API MOZ_EXTERN_C
+#endif
+
+#ifndef mozmem_malloc_impl
+# define mozmem_malloc_impl(a) a
+#endif
+#ifndef mozmem_dup_impl
+# define mozmem_dup_impl(a) a
+#endif
+
+// Malloc implementation functions
+#define malloc_impl mozmem_malloc_impl(malloc)
+#define posix_memalign_impl mozmem_malloc_impl(posix_memalign)
+#define aligned_alloc_impl mozmem_malloc_impl(aligned_alloc)
+#define calloc_impl mozmem_malloc_impl(calloc)
+#define realloc_impl mozmem_malloc_impl(realloc)
+#define free_impl mozmem_malloc_impl(free)
+#define memalign_impl mozmem_malloc_impl(memalign)
+#define valloc_impl mozmem_malloc_impl(valloc)
+#define malloc_usable_size_impl mozmem_malloc_impl(malloc_usable_size)
+#define malloc_good_size_impl mozmem_malloc_impl(malloc_good_size)
+
+// Duplication functions
+#define strndup_impl mozmem_dup_impl(strndup)
+#define strdup_impl mozmem_dup_impl(strdup)
+#ifdef XP_WIN
+# define wcsdup_impl mozmem_dup_impl(wcsdup)
+# define _aligned_malloc_impl mozmem_dup_impl(_aligned_malloc)
+#endif
+
+// String functions
+#ifdef ANDROID
+// Bug 801571 and Bug 879668, libstagefright uses vasprintf, causing malloc()/
+// free() to be mismatched between bionic and mozglue implementation.
+# define vasprintf_impl mozmem_dup_impl(vasprintf)
+# define asprintf_impl mozmem_dup_impl(asprintf)
+#endif
+
+#endif // mozmemory_wrap_h
diff --git a/memory/build/rb.h b/memory/build/rb.h
new file mode 100644
index 0000000000..418d206911
--- /dev/null
+++ b/memory/build/rb.h
@@ -0,0 +1,741 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Portions of this file were originally under the following license:
+//
+// Copyright (C) 2008 Jason Evans <jasone@FreeBSD.org>.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+// notice(s), this list of conditions and the following disclaimer
+// unmodified other than the allowable addition of one or more
+// copyright notices.
+// 2. Redistributions in binary form must reproduce the above copyright
+// notice(s), this list of conditions and the following disclaimer in
+// the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// ****************************************************************************
+//
+// C++ template implementation of left-leaning red-black trees.
+//
+// All operations are done non-recursively. Parent pointers are not used, and
+// color bits are stored in the least significant bit of right-child pointers,
+// thus making node linkage as compact as is possible for red-black trees.
+//
+// The RedBlackTree template expects two type arguments: the type of the nodes,
+// containing a RedBlackTreeNode, and a trait providing two methods:
+// - a GetTreeNode method that returns a reference to the RedBlackTreeNode
+// corresponding to a given node with the following signature:
+// static RedBlackTreeNode<T>& GetTreeNode(T*)
+// - a Compare function with the following signature:
+// static Order Compare(T* aNode, T* aOther)
+// ^^^^^
+// or aKey
+//
+// Interpretation of comparision function return values:
+//
+// Order::eLess: aNode < aOther
+// Order::eEqual: aNode == aOther
+// Order::eGreater: aNode > aOther
+//
+// In all cases, the aNode or aKey argument is the first argument to the
+// comparison function, which makes it possible to write comparison functions
+// that treat the first argument specially.
+//
+// ***************************************************************************
+
+#ifndef RB_H_
+#define RB_H_
+
+#include "mozilla/Alignment.h"
+#include "mozilla/Assertions.h"
+#include "Utils.h"
+
+enum NodeColor {
+ Black = 0,
+ Red = 1,
+};
+
+// Node structure.
+template <typename T>
+class RedBlackTreeNode {
+ T* mLeft;
+ // The lowest bit is the color
+ T* mRightAndColor;
+
+ public:
+ T* Left() { return mLeft; }
+
+ void SetLeft(T* aValue) { mLeft = aValue; }
+
+ T* Right() {
+ return reinterpret_cast<T*>(reinterpret_cast<uintptr_t>(mRightAndColor) &
+ uintptr_t(~1));
+ }
+
+ void SetRight(T* aValue) {
+ mRightAndColor = reinterpret_cast<T*>(
+ (reinterpret_cast<uintptr_t>(aValue) & uintptr_t(~1)) | Color());
+ }
+
+ NodeColor Color() {
+ return static_cast<NodeColor>(reinterpret_cast<uintptr_t>(mRightAndColor) &
+ 1);
+ }
+
+ bool IsBlack() { return Color() == NodeColor::Black; }
+
+ bool IsRed() { return Color() == NodeColor::Red; }
+
+ void SetColor(NodeColor aColor) {
+ mRightAndColor = reinterpret_cast<T*>(
+ (reinterpret_cast<uintptr_t>(mRightAndColor) & uintptr_t(~1)) | aColor);
+ }
+};
+
+// Tree structure.
+template <typename T, typename Trait>
+class RedBlackTree {
+ public:
+ void Init() { mRoot = nullptr; }
+
+ T* First(T* aStart = nullptr) { return First(TreeNode(aStart)).Get(); }
+
+ T* Last(T* aStart = nullptr) { return Last(TreeNode(aStart)).Get(); }
+
+ T* Next(T* aNode) { return Next(TreeNode(aNode)).Get(); }
+
+ T* Prev(T* aNode) { return Prev(TreeNode(aNode)).Get(); }
+
+ T* Search(T* aKey) { return Search(TreeNode(aKey)).Get(); }
+
+ // Find a match if it exists. Otherwise, find the next greater node, if one
+ // exists.
+ T* SearchOrNext(T* aKey) { return SearchOrNext(TreeNode(aKey)).Get(); }
+
+ void Insert(T* aNode) { Insert(TreeNode(aNode)); }
+
+ void Remove(T* aNode) { Remove(TreeNode(aNode)); }
+
+ // Helper class to avoid having all the tree traversal code further below
+ // have to use Trait::GetTreeNode and do manual null pointer checks, adding
+ // visual noise. Practically speaking TreeNode(nullptr) acts as a virtual
+ // sentinel, that loops back to itself for Left() and Right() and is always
+ // black.
+ class TreeNode {
+ public:
+ constexpr TreeNode() : mNode(nullptr) {}
+
+ MOZ_IMPLICIT TreeNode(T* aNode) : mNode(aNode) {}
+
+ TreeNode& operator=(TreeNode aOther) {
+ mNode = aOther.mNode;
+ return *this;
+ }
+
+ TreeNode Left() {
+ return TreeNode(mNode ? Trait::GetTreeNode(mNode).Left() : nullptr);
+ }
+
+ void SetLeft(TreeNode aNode) {
+ MOZ_RELEASE_ASSERT(mNode);
+ Trait::GetTreeNode(mNode).SetLeft(aNode.mNode);
+ }
+
+ TreeNode Right() {
+ return TreeNode(mNode ? Trait::GetTreeNode(mNode).Right() : nullptr);
+ }
+
+ void SetRight(TreeNode aNode) {
+ MOZ_RELEASE_ASSERT(mNode);
+ Trait::GetTreeNode(mNode).SetRight(aNode.mNode);
+ }
+
+ NodeColor Color() {
+ return mNode ? Trait::GetTreeNode(mNode).Color() : NodeColor::Black;
+ }
+
+ bool IsRed() { return Color() == NodeColor::Red; }
+
+ bool IsBlack() { return Color() == NodeColor::Black; }
+
+ void SetColor(NodeColor aColor) {
+ MOZ_RELEASE_ASSERT(mNode);
+ Trait::GetTreeNode(mNode).SetColor(aColor);
+ }
+
+ T* Get() { return mNode; }
+
+ MOZ_IMPLICIT operator bool() { return !!mNode; }
+
+ bool operator==(TreeNode& aOther) { return mNode == aOther.mNode; }
+
+ private:
+ T* mNode;
+ };
+
+ private:
+ // Ideally we'd use a TreeNode for mRoot, but we need RedBlackTree to stay
+ // a POD type to avoid a static initializer for gArenas.
+ T* mRoot;
+
+ TreeNode First(TreeNode aStart) {
+ TreeNode ret;
+ for (ret = aStart ? aStart : mRoot; ret.Left(); ret = ret.Left()) {
+ }
+ return ret;
+ }
+
+ TreeNode Last(TreeNode aStart) {
+ TreeNode ret;
+ for (ret = aStart ? aStart : mRoot; ret.Right(); ret = ret.Right()) {
+ }
+ return ret;
+ }
+
+ TreeNode Next(TreeNode aNode) {
+ TreeNode ret;
+ if (aNode.Right()) {
+ ret = First(aNode.Right());
+ } else {
+ TreeNode rbp_n_t = mRoot;
+ MOZ_ASSERT(rbp_n_t);
+ ret = nullptr;
+ while (true) {
+ Order rbp_n_cmp = Trait::Compare(aNode.Get(), rbp_n_t.Get());
+ if (rbp_n_cmp == Order::eLess) {
+ ret = rbp_n_t;
+ rbp_n_t = rbp_n_t.Left();
+ } else if (rbp_n_cmp == Order::eGreater) {
+ rbp_n_t = rbp_n_t.Right();
+ } else {
+ break;
+ }
+ MOZ_ASSERT(rbp_n_t);
+ }
+ }
+ return ret;
+ }
+
+ TreeNode Prev(TreeNode aNode) {
+ TreeNode ret;
+ if (aNode.Left()) {
+ ret = Last(aNode.Left());
+ } else {
+ TreeNode rbp_p_t = mRoot;
+ MOZ_ASSERT(rbp_p_t);
+ ret = nullptr;
+ while (true) {
+ Order rbp_p_cmp = Trait::Compare(aNode.Get(), rbp_p_t.Get());
+ if (rbp_p_cmp == Order::eLess) {
+ rbp_p_t = rbp_p_t.Left();
+ } else if (rbp_p_cmp == Order::eGreater) {
+ ret = rbp_p_t;
+ rbp_p_t = rbp_p_t.Right();
+ } else {
+ break;
+ }
+ MOZ_ASSERT(rbp_p_t);
+ }
+ }
+ return ret;
+ }
+
+ TreeNode Search(TreeNode aKey) {
+ TreeNode ret = mRoot;
+ Order rbp_se_cmp;
+ while (ret && (rbp_se_cmp = Trait::Compare(aKey.Get(), ret.Get())) !=
+ Order::eEqual) {
+ if (rbp_se_cmp == Order::eLess) {
+ ret = ret.Left();
+ } else {
+ ret = ret.Right();
+ }
+ }
+ return ret;
+ }
+
+ TreeNode SearchOrNext(TreeNode aKey) {
+ TreeNode ret = nullptr;
+ TreeNode rbp_ns_t = mRoot;
+ while (rbp_ns_t) {
+ Order rbp_ns_cmp = Trait::Compare(aKey.Get(), rbp_ns_t.Get());
+ if (rbp_ns_cmp == Order::eLess) {
+ ret = rbp_ns_t;
+ rbp_ns_t = rbp_ns_t.Left();
+ } else if (rbp_ns_cmp == Order::eGreater) {
+ rbp_ns_t = rbp_ns_t.Right();
+ } else {
+ ret = rbp_ns_t;
+ break;
+ }
+ }
+ return ret;
+ }
+
+ void Insert(TreeNode aNode) {
+ // rbp_i_s is only used as a placeholder for its RedBlackTreeNode. Use
+ // AlignedStorage2 to avoid running the TreeNode base class constructor.
+ mozilla::AlignedStorage2<T> rbp_i_s;
+ TreeNode rbp_i_g, rbp_i_p, rbp_i_c, rbp_i_t, rbp_i_u;
+ Order rbp_i_cmp = Order::eEqual;
+ rbp_i_g = nullptr;
+ rbp_i_p = rbp_i_s.addr();
+ rbp_i_p.SetLeft(mRoot);
+ rbp_i_p.SetRight(nullptr);
+ rbp_i_p.SetColor(NodeColor::Black);
+ rbp_i_c = mRoot;
+ // Iteratively search down the tree for the insertion point,
+ // splitting 4-nodes as they are encountered. At the end of each
+ // iteration, rbp_i_g->rbp_i_p->rbp_i_c is a 3-level path down
+ // the tree, assuming a sufficiently deep tree.
+ while (rbp_i_c) {
+ rbp_i_t = rbp_i_c.Left();
+ rbp_i_u = rbp_i_t.Left();
+ if (rbp_i_t.IsRed() && rbp_i_u.IsRed()) {
+ // rbp_i_c is the top of a logical 4-node, so split it.
+ // This iteration does not move down the tree, due to the
+ // disruptiveness of node splitting.
+ //
+ // Rotate right.
+ rbp_i_t = RotateRight(rbp_i_c);
+ // Pass red links up one level.
+ rbp_i_u = rbp_i_t.Left();
+ rbp_i_u.SetColor(NodeColor::Black);
+ if (rbp_i_p.Left() == rbp_i_c) {
+ rbp_i_p.SetLeft(rbp_i_t);
+ rbp_i_c = rbp_i_t;
+ } else {
+ // rbp_i_c was the right child of rbp_i_p, so rotate
+ // left in order to maintain the left-leaning invariant.
+ MOZ_ASSERT(rbp_i_p.Right() == rbp_i_c);
+ rbp_i_p.SetRight(rbp_i_t);
+ rbp_i_u = LeanLeft(rbp_i_p);
+ if (rbp_i_g.Left() == rbp_i_p) {
+ rbp_i_g.SetLeft(rbp_i_u);
+ } else {
+ MOZ_ASSERT(rbp_i_g.Right() == rbp_i_p);
+ rbp_i_g.SetRight(rbp_i_u);
+ }
+ rbp_i_p = rbp_i_u;
+ rbp_i_cmp = Trait::Compare(aNode.Get(), rbp_i_p.Get());
+ if (rbp_i_cmp == Order::eLess) {
+ rbp_i_c = rbp_i_p.Left();
+ } else {
+ MOZ_ASSERT(rbp_i_cmp == Order::eGreater);
+ rbp_i_c = rbp_i_p.Right();
+ }
+ continue;
+ }
+ }
+ rbp_i_g = rbp_i_p;
+ rbp_i_p = rbp_i_c;
+ rbp_i_cmp = Trait::Compare(aNode.Get(), rbp_i_c.Get());
+ if (rbp_i_cmp == Order::eLess) {
+ rbp_i_c = rbp_i_c.Left();
+ } else {
+ MOZ_ASSERT(rbp_i_cmp == Order::eGreater);
+ rbp_i_c = rbp_i_c.Right();
+ }
+ }
+ // rbp_i_p now refers to the node under which to insert.
+ aNode.SetLeft(nullptr);
+ aNode.SetRight(nullptr);
+ aNode.SetColor(NodeColor::Red);
+ if (rbp_i_cmp == Order::eGreater) {
+ rbp_i_p.SetRight(aNode);
+ rbp_i_t = LeanLeft(rbp_i_p);
+ if (rbp_i_g.Left() == rbp_i_p) {
+ rbp_i_g.SetLeft(rbp_i_t);
+ } else if (rbp_i_g.Right() == rbp_i_p) {
+ rbp_i_g.SetRight(rbp_i_t);
+ }
+ } else {
+ rbp_i_p.SetLeft(aNode);
+ }
+ // Update the root and make sure that it is black.
+ TreeNode root = TreeNode(rbp_i_s.addr()).Left();
+ root.SetColor(NodeColor::Black);
+ mRoot = root.Get();
+ }
+
+ void Remove(TreeNode aNode) {
+ // rbp_r_s is only used as a placeholder for its RedBlackTreeNode. Use
+ // AlignedStorage2 to avoid running the TreeNode base class constructor.
+ mozilla::AlignedStorage2<T> rbp_r_s;
+ TreeNode rbp_r_p, rbp_r_c, rbp_r_xp, rbp_r_t, rbp_r_u;
+ Order rbp_r_cmp;
+ rbp_r_p = TreeNode(rbp_r_s.addr());
+ rbp_r_p.SetLeft(mRoot);
+ rbp_r_p.SetRight(nullptr);
+ rbp_r_p.SetColor(NodeColor::Black);
+ rbp_r_c = mRoot;
+ rbp_r_xp = nullptr;
+ // Iterate down the tree, but always transform 2-nodes to 3- or
+ // 4-nodes in order to maintain the invariant that the current
+ // node is not a 2-node. This allows simple deletion once a leaf
+ // is reached. Handle the root specially though, since there may
+ // be no way to convert it from a 2-node to a 3-node.
+ rbp_r_cmp = Trait::Compare(aNode.Get(), rbp_r_c.Get());
+ if (rbp_r_cmp == Order::eLess) {
+ rbp_r_t = rbp_r_c.Left();
+ rbp_r_u = rbp_r_t.Left();
+ if (rbp_r_t.IsBlack() && rbp_r_u.IsBlack()) {
+ // Apply standard transform to prepare for left move.
+ rbp_r_t = MoveRedLeft(rbp_r_c);
+ rbp_r_t.SetColor(NodeColor::Black);
+ rbp_r_p.SetLeft(rbp_r_t);
+ rbp_r_c = rbp_r_t;
+ } else {
+ // Move left.
+ rbp_r_p = rbp_r_c;
+ rbp_r_c = rbp_r_c.Left();
+ }
+ } else {
+ if (rbp_r_cmp == Order::eEqual) {
+ MOZ_ASSERT(aNode == rbp_r_c);
+ if (!rbp_r_c.Right()) {
+ // Delete root node (which is also a leaf node).
+ if (rbp_r_c.Left()) {
+ rbp_r_t = LeanRight(rbp_r_c);
+ rbp_r_t.SetRight(nullptr);
+ } else {
+ rbp_r_t = nullptr;
+ }
+ rbp_r_p.SetLeft(rbp_r_t);
+ } else {
+ // This is the node we want to delete, but we will
+ // instead swap it with its successor and delete the
+ // successor. Record enough information to do the
+ // swap later. rbp_r_xp is the aNode's parent.
+ rbp_r_xp = rbp_r_p;
+ rbp_r_cmp = Order::eGreater; // Note that deletion is incomplete.
+ }
+ }
+ if (rbp_r_cmp == Order::eGreater) {
+ if (rbp_r_c.Right().Left().IsBlack()) {
+ rbp_r_t = rbp_r_c.Left();
+ if (rbp_r_t.IsRed()) {
+ // Standard transform.
+ rbp_r_t = MoveRedRight(rbp_r_c);
+ } else {
+ // Root-specific transform.
+ rbp_r_c.SetColor(NodeColor::Red);
+ rbp_r_u = rbp_r_t.Left();
+ if (rbp_r_u.IsRed()) {
+ rbp_r_u.SetColor(NodeColor::Black);
+ rbp_r_t = RotateRight(rbp_r_c);
+ rbp_r_u = RotateLeft(rbp_r_c);
+ rbp_r_t.SetRight(rbp_r_u);
+ } else {
+ rbp_r_t.SetColor(NodeColor::Red);
+ rbp_r_t = RotateLeft(rbp_r_c);
+ }
+ }
+ rbp_r_p.SetLeft(rbp_r_t);
+ rbp_r_c = rbp_r_t;
+ } else {
+ // Move right.
+ rbp_r_p = rbp_r_c;
+ rbp_r_c = rbp_r_c.Right();
+ }
+ }
+ }
+ if (rbp_r_cmp != Order::eEqual) {
+ while (true) {
+ MOZ_ASSERT(rbp_r_p);
+ rbp_r_cmp = Trait::Compare(aNode.Get(), rbp_r_c.Get());
+ if (rbp_r_cmp == Order::eLess) {
+ rbp_r_t = rbp_r_c.Left();
+ if (!rbp_r_t) {
+ // rbp_r_c now refers to the successor node to
+ // relocate, and rbp_r_xp/aNode refer to the
+ // context for the relocation.
+ if (rbp_r_xp.Left() == aNode) {
+ rbp_r_xp.SetLeft(rbp_r_c);
+ } else {
+ MOZ_ASSERT(rbp_r_xp.Right() == (aNode));
+ rbp_r_xp.SetRight(rbp_r_c);
+ }
+ rbp_r_c.SetLeft(aNode.Left());
+ rbp_r_c.SetRight(aNode.Right());
+ rbp_r_c.SetColor(aNode.Color());
+ if (rbp_r_p.Left() == rbp_r_c) {
+ rbp_r_p.SetLeft(nullptr);
+ } else {
+ MOZ_ASSERT(rbp_r_p.Right() == rbp_r_c);
+ rbp_r_p.SetRight(nullptr);
+ }
+ break;
+ }
+ rbp_r_u = rbp_r_t.Left();
+ if (rbp_r_t.IsBlack() && rbp_r_u.IsBlack()) {
+ rbp_r_t = MoveRedLeft(rbp_r_c);
+ if (rbp_r_p.Left() == rbp_r_c) {
+ rbp_r_p.SetLeft(rbp_r_t);
+ } else {
+ rbp_r_p.SetRight(rbp_r_t);
+ }
+ rbp_r_c = rbp_r_t;
+ } else {
+ rbp_r_p = rbp_r_c;
+ rbp_r_c = rbp_r_c.Left();
+ }
+ } else {
+ // Check whether to delete this node (it has to be
+ // the correct node and a leaf node).
+ if (rbp_r_cmp == Order::eEqual) {
+ MOZ_ASSERT(aNode == rbp_r_c);
+ if (!rbp_r_c.Right()) {
+ // Delete leaf node.
+ if (rbp_r_c.Left()) {
+ rbp_r_t = LeanRight(rbp_r_c);
+ rbp_r_t.SetRight(nullptr);
+ } else {
+ rbp_r_t = nullptr;
+ }
+ if (rbp_r_p.Left() == rbp_r_c) {
+ rbp_r_p.SetLeft(rbp_r_t);
+ } else {
+ rbp_r_p.SetRight(rbp_r_t);
+ }
+ break;
+ }
+ // This is the node we want to delete, but we
+ // will instead swap it with its successor
+ // and delete the successor. Record enough
+ // information to do the swap later.
+ // rbp_r_xp is aNode's parent.
+ rbp_r_xp = rbp_r_p;
+ }
+ rbp_r_t = rbp_r_c.Right();
+ rbp_r_u = rbp_r_t.Left();
+ if (rbp_r_u.IsBlack()) {
+ rbp_r_t = MoveRedRight(rbp_r_c);
+ if (rbp_r_p.Left() == rbp_r_c) {
+ rbp_r_p.SetLeft(rbp_r_t);
+ } else {
+ rbp_r_p.SetRight(rbp_r_t);
+ }
+ rbp_r_c = rbp_r_t;
+ } else {
+ rbp_r_p = rbp_r_c;
+ rbp_r_c = rbp_r_c.Right();
+ }
+ }
+ }
+ }
+ // Update root.
+ mRoot = TreeNode(rbp_r_s.addr()).Left().Get();
+ aNode.SetLeft(nullptr);
+ aNode.SetRight(nullptr);
+ aNode.SetColor(NodeColor::Black);
+ }
+
+ TreeNode RotateLeft(TreeNode aNode) {
+ TreeNode node = aNode.Right();
+ aNode.SetRight(node.Left());
+ node.SetLeft(aNode);
+ return node;
+ }
+
+ TreeNode RotateRight(TreeNode aNode) {
+ TreeNode node = aNode.Left();
+ aNode.SetLeft(node.Right());
+ node.SetRight(aNode);
+ return node;
+ }
+
+ TreeNode LeanLeft(TreeNode aNode) {
+ TreeNode node = RotateLeft(aNode);
+ NodeColor color = aNode.Color();
+ node.SetColor(color);
+ aNode.SetColor(NodeColor::Red);
+ return node;
+ }
+
+ TreeNode LeanRight(TreeNode aNode) {
+ TreeNode node = RotateRight(aNode);
+ NodeColor color = aNode.Color();
+ node.SetColor(color);
+ aNode.SetColor(NodeColor::Red);
+ return node;
+ }
+
+ TreeNode MoveRedLeft(TreeNode aNode) {
+ TreeNode node;
+ TreeNode rbp_mrl_t, rbp_mrl_u;
+ rbp_mrl_t = aNode.Left();
+ rbp_mrl_t.SetColor(NodeColor::Red);
+ rbp_mrl_t = aNode.Right();
+ rbp_mrl_u = rbp_mrl_t.Left();
+ if (rbp_mrl_u.IsRed()) {
+ rbp_mrl_u = RotateRight(rbp_mrl_t);
+ aNode.SetRight(rbp_mrl_u);
+ node = RotateLeft(aNode);
+ rbp_mrl_t = aNode.Right();
+ if (rbp_mrl_t.IsRed()) {
+ rbp_mrl_t.SetColor(NodeColor::Black);
+ aNode.SetColor(NodeColor::Red);
+ rbp_mrl_t = RotateLeft(aNode);
+ node.SetLeft(rbp_mrl_t);
+ } else {
+ aNode.SetColor(NodeColor::Black);
+ }
+ } else {
+ aNode.SetColor(NodeColor::Red);
+ node = RotateLeft(aNode);
+ }
+ return node;
+ }
+
+ TreeNode MoveRedRight(TreeNode aNode) {
+ TreeNode node;
+ TreeNode rbp_mrr_t;
+ rbp_mrr_t = aNode.Left();
+ if (rbp_mrr_t.IsRed()) {
+ TreeNode rbp_mrr_u, rbp_mrr_v;
+ rbp_mrr_u = rbp_mrr_t.Right();
+ rbp_mrr_v = rbp_mrr_u.Left();
+ if (rbp_mrr_v.IsRed()) {
+ rbp_mrr_u.SetColor(aNode.Color());
+ rbp_mrr_v.SetColor(NodeColor::Black);
+ rbp_mrr_u = RotateLeft(rbp_mrr_t);
+ aNode.SetLeft(rbp_mrr_u);
+ node = RotateRight(aNode);
+ rbp_mrr_t = RotateLeft(aNode);
+ node.SetRight(rbp_mrr_t);
+ } else {
+ rbp_mrr_t.SetColor(aNode.Color());
+ rbp_mrr_u.SetColor(NodeColor::Red);
+ node = RotateRight(aNode);
+ rbp_mrr_t = RotateLeft(aNode);
+ node.SetRight(rbp_mrr_t);
+ }
+ aNode.SetColor(NodeColor::Red);
+ } else {
+ rbp_mrr_t.SetColor(NodeColor::Red);
+ rbp_mrr_t = rbp_mrr_t.Left();
+ if (rbp_mrr_t.IsRed()) {
+ rbp_mrr_t.SetColor(NodeColor::Black);
+ node = RotateRight(aNode);
+ rbp_mrr_t = RotateLeft(aNode);
+ node.SetRight(rbp_mrr_t);
+ } else {
+ node = RotateLeft(aNode);
+ }
+ }
+ return node;
+ }
+
+ // The iterator simulates recursion via an array of pointers that store the
+ // current path. This is critical to performance, since a series of calls to
+ // rb_{next,prev}() would require time proportional to (n lg n), whereas this
+ // implementation only requires time proportional to (n).
+ //
+ // Since the iterator caches a path down the tree, any tree modification may
+ // cause the cached path to become invalid. Don't modify the tree during an
+ // iteration.
+
+ // Size the path arrays such that they are always large enough, even if a
+ // tree consumes all of memory. Since each node must contain a minimum of
+ // two pointers, there can never be more nodes than:
+ //
+ // 1 << ((sizeof(void*)<<3) - (log2(sizeof(void*))+1))
+ //
+ // Since the depth of a tree is limited to 3*lg(#nodes), the maximum depth
+ // is:
+ //
+ // (3 * ((sizeof(void*)<<3) - (log2(sizeof(void*))+1)))
+ //
+ // This works out to a maximum depth of 87 and 180 for 32- and 64-bit
+ // systems, respectively (approximately 348 and 1440 bytes, respectively).
+ public:
+ class Iterator {
+ TreeNode mPath[3 * ((sizeof(void*) << 3) - (LOG2(sizeof(void*)) + 1))];
+ unsigned mDepth;
+
+ public:
+ explicit Iterator(RedBlackTree<T, Trait>* aTree) : mDepth(0) {
+ // Initialize the path to contain the left spine.
+ if (aTree->mRoot) {
+ TreeNode node;
+ mPath[mDepth++] = aTree->mRoot;
+ while ((node = mPath[mDepth - 1].Left())) {
+ mPath[mDepth++] = node;
+ }
+ }
+ }
+
+ template <typename Iterator>
+ class Item {
+ Iterator* mIterator;
+ T* mItem;
+
+ public:
+ Item(Iterator* aIterator, T* aItem)
+ : mIterator(aIterator), mItem(aItem) {}
+
+ bool operator!=(const Item& aOther) const {
+ return (mIterator != aOther.mIterator) || (mItem != aOther.mItem);
+ }
+
+ T* operator*() const { return mItem; }
+
+ const Item& operator++() {
+ mItem = mIterator->Next();
+ return *this;
+ }
+ };
+
+ Item<Iterator> begin() {
+ return Item<Iterator>(this,
+ mDepth > 0 ? mPath[mDepth - 1].Get() : nullptr);
+ }
+
+ Item<Iterator> end() { return Item<Iterator>(this, nullptr); }
+
+ T* Next() {
+ TreeNode node;
+ if ((node = mPath[mDepth - 1].Right())) {
+ // The successor is the left-most node in the right subtree.
+ mPath[mDepth++] = node;
+ while ((node = mPath[mDepth - 1].Left())) {
+ mPath[mDepth++] = node;
+ }
+ } else {
+ // The successor is above the current node. Unwind until a
+ // left-leaning edge is removed from the path, of the path is empty.
+ for (mDepth--; mDepth > 0; mDepth--) {
+ if (mPath[mDepth - 1].Left() == mPath[mDepth]) {
+ break;
+ }
+ }
+ }
+ return mDepth > 0 ? mPath[mDepth - 1].Get() : nullptr;
+ }
+ };
+
+ Iterator iter() { return Iterator(this); }
+};
+
+#endif // RB_H_
diff --git a/memory/build/replace_malloc.h b/memory/build/replace_malloc.h
new file mode 100644
index 0000000000..9ea3493f99
--- /dev/null
+++ b/memory/build/replace_malloc.h
@@ -0,0 +1,113 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef replace_malloc_h
+#define replace_malloc_h
+
+// The replace_malloc facility allows an external library to replace or
+// supplement the jemalloc implementation.
+//
+// The external library may be hooked by setting one of the following
+// environment variables to the library path:
+// - LD_PRELOAD on Linux,
+// - DYLD_INSERT_LIBRARIES on OSX,
+// - MOZ_REPLACE_MALLOC_LIB on Windows and Android.
+//
+// An initialization function is called before any malloc replacement
+// function, and has the following declaration:
+//
+// void replace_init(malloc_table_t*, ReplaceMallocBridge**)
+//
+// The malloc_table_t pointer given to that function is a table containing
+// pointers to the original allocator implementation, so that replacement
+// functions can call them back if they need to. The initialization function
+// needs to alter that table to replace the function it wants to replace.
+// If it needs the original implementation, it thus needs a copy of the
+// original table.
+//
+// The ReplaceMallocBridge* pointer is an outparam that allows the
+// replace_init function to return a pointer to its ReplaceMallocBridge
+// (see replace_malloc_bridge.h).
+//
+// The functions to be implemented in the external library are of the form:
+//
+// void* replace_malloc(size_t size)
+// {
+// // Fiddle with the size if necessary.
+// // orig->malloc doesn't have to be called if the external library
+// // provides its own allocator, but in this case it will have to
+// // implement all functions.
+// void *ptr = orig->malloc(size);
+// // Do whatever you want with the ptr.
+// return ptr;
+// }
+//
+// where "orig" is a pointer to a copy of the table replace_init got.
+//
+// See malloc_decls.h for a list of functions that can be replaced this
+// way. The implementations are all in the form:
+// return_type replace_name(arguments [,...])
+//
+// They don't all need to be provided.
+//
+// Building a replace-malloc library is like rocket science. It can end up
+// with things blowing up, especially when trying to use complex types, and
+// even more especially when these types come from XPCOM or other parts of the
+// Mozilla codebase.
+// It is recommended to add the following to a replace-malloc implementation's
+// moz.build:
+// DISABLE_STL_WRAPPING = True # Avoid STL wrapping
+//
+// If your replace-malloc implementation lives under memory/replace, these
+// are taken care of by memory/replace/defs.mk.
+
+#ifdef replace_malloc_bridge_h
+# error Do not include replace_malloc_bridge.h before replace_malloc.h. \
+ In fact, you only need the latter.
+#endif
+
+#define REPLACE_MALLOC_IMPL
+
+#include "replace_malloc_bridge.h"
+
+// Implementing a replace-malloc library is incompatible with using mozalloc.
+#define MOZ_NO_MOZALLOC 1
+
+#include "mozilla/MacroArgs.h"
+#include "mozilla/Types.h"
+
+MOZ_BEGIN_EXTERN_C
+
+// MOZ_REPLACE_WEAK is only defined in mozjemalloc.cpp. Normally including
+// this header will add function definitions.
+#ifndef MOZ_REPLACE_WEAK
+# define MOZ_REPLACE_WEAK
+#endif
+
+// When building a replace-malloc library for static linking, we want
+// each to have a different name for their "public" functions.
+// The build system defines MOZ_REPLACE_MALLOC_PREFIX in that case.
+#ifdef MOZ_REPLACE_MALLOC_PREFIX
+# define replace_init MOZ_CONCAT(MOZ_REPLACE_MALLOC_PREFIX, _init)
+# define MOZ_REPLACE_PUBLIC
+#else
+# define MOZ_REPLACE_PUBLIC MOZ_EXPORT
+#endif
+
+struct ReplaceMallocBridge;
+typedef void (*jemalloc_init_func)(malloc_table_t*,
+ struct ReplaceMallocBridge**);
+
+// Replace-malloc library initialization function. See top of this file
+MOZ_REPLACE_PUBLIC void replace_init(
+ malloc_table_t*, struct ReplaceMallocBridge**) MOZ_REPLACE_WEAK;
+
+// ensure this is visible and libxul/etc reference it with a weak ref
+MFBT_API void jemalloc_replace_dynamic(jemalloc_init_func);
+
+MOZ_END_EXTERN_C
+
+#endif // replace_malloc_h
diff --git a/memory/build/replace_malloc_bridge.h b/memory/build/replace_malloc_bridge.h
new file mode 100644
index 0000000000..20683c85df
--- /dev/null
+++ b/memory/build/replace_malloc_bridge.h
@@ -0,0 +1,277 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef replace_malloc_bridge_h
+#define replace_malloc_bridge_h
+
+// The replace-malloc bridge allows bidirectional method calls between
+// a program and the replace-malloc library that has been loaded for it.
+// In Firefox, this is used to allow method calls between code in libxul
+// and code in the replace-malloc library, without libxul needing to link
+// against that library or vice-versa.
+//
+// Subsystems can add methods for their own need. Replace-malloc libraries
+// can decide to implement those methods or not.
+//
+// Replace-malloc libraries can provide such a bridge by implementing
+// a ReplaceMallocBridge-derived class, and a get_bridge function
+// returning an instance of that class. The default methods in
+// ReplaceMallocBridge are expected to return values that callers would
+// understand as "the bridge doesn't implement this method", so that a
+// replace-malloc library doesn't have to implement all methods.
+//
+// The ReplaceMallocBridge class contains definitions for methods for
+// all replace-malloc libraries. Each library picks the methods it wants
+// to reply to in its ReplaceMallocBridge-derived class instance.
+// All methods of ReplaceMallocBridge must be virtual. Similarly,
+// anything passed as an argument to those methods must be plain data, or
+// an instance of a class with only virtual methods.
+//
+// Binary compatibility is expected to be maintained, such that a newer
+// Firefox can be used with an old replace-malloc library, or an old
+// Firefox can be used with a newer replace-malloc library. As such, only
+// new virtual methods should be added to ReplaceMallocBridge, and
+// each change should have a corresponding bump of the mVersion value.
+// At the same time, each virtual method should have a corresponding
+// wrapper calling the virtual method on the instance from
+// ReplaceMallocBridge::Get(), giving it the version the virtual method
+// was added.
+//
+// Parts that are not relevant to the replace-malloc library end of the
+// bridge are hidden when REPLACE_MALLOC_IMPL is not defined, which is
+// the case when including replace_malloc.h.
+
+struct ReplaceMallocBridge;
+
+#include "mozilla/Types.h"
+
+MOZ_BEGIN_EXTERN_C
+
+#ifndef REPLACE_MALLOC_IMPL
+// Returns the replace-malloc bridge if there is one to be returned.
+MFBT_API ReplaceMallocBridge* get_bridge();
+#endif
+
+// Table of malloc functions.
+// e.g. void* (*malloc)(size_t), etc.
+
+#define MALLOC_DECL(name, return_type, ...) \
+ typedef return_type(name##_impl_t)(__VA_ARGS__);
+
+#include "malloc_decls.h"
+
+#define MALLOC_DECL(name, return_type, ...) name##_impl_t* name;
+
+typedef struct {
+#include "malloc_decls.h"
+} malloc_table_t;
+
+MOZ_END_EXTERN_C
+
+#ifdef __cplusplus
+
+// Table of malloc hook functions.
+// Those functions are called with the arguments and results of malloc
+// functions after they are called.
+// e.g. void* (*malloc_hook)(void*, size_t), etc.
+// They can either return the result they're given, or alter it before
+// returning it.
+// The hooks corresponding to functions, like free(void*), that return no
+// value, don't take an extra argument.
+// The table must at least contain a pointer for malloc_hook and free_hook
+// functions. They will be used as fallback if no pointer is given for
+// other allocation functions, like calloc_hook.
+namespace mozilla {
+namespace detail {
+template <typename R, typename... Args>
+struct AllocHookType {
+ using Type = R (*)(R, Args...);
+};
+
+template <typename... Args>
+struct AllocHookType<void, Args...> {
+ using Type = void (*)(Args...);
+};
+
+} // namespace detail
+} // namespace mozilla
+
+# define MALLOC_DECL(name, return_type, ...) \
+ typename mozilla::detail::AllocHookType<return_type, ##__VA_ARGS__>::Type \
+ name##_hook;
+
+typedef struct {
+# include "malloc_decls.h"
+ // Like free_hook, but called before realloc_hook. free_hook is called
+ // instead of not given.
+ void (*realloc_hook_before)(void* aPtr);
+} malloc_hook_table_t;
+
+namespace mozilla {
+namespace dmd {
+struct DMDFuncs;
+} // namespace dmd
+
+namespace phc {
+class AddrInfo;
+
+struct MemoryUsage {
+ // The amount of memory used for PHC metadata, eg information about each
+ // allocation including stacks.
+ size_t mMetadataBytes = 0;
+
+ // The amount of memory lost due to rounding allocation sizes up to the
+ // nearest page. AKA internal fragmentation.
+ size_t mFragmentationBytes = 0;
+};
+} // namespace phc
+
+// Callbacks to register debug file handles for Poison IO interpose.
+// See Mozilla(|Un)RegisterDebugHandle in xpcom/build/PoisonIOInterposer.h
+struct DebugFdRegistry {
+ virtual void RegisterHandle(intptr_t aFd);
+
+ virtual void UnRegisterHandle(intptr_t aFd);
+};
+} // namespace mozilla
+
+struct ReplaceMallocBridge {
+ ReplaceMallocBridge() : mVersion(5) {}
+
+ // This method was added in version 1 of the bridge.
+ virtual mozilla::dmd::DMDFuncs* GetDMDFuncs() { return nullptr; }
+
+ // Send a DebugFdRegistry instance to the replace-malloc library so that
+ // it can register/unregister file descriptors whenever needed. The
+ // instance is valid until the process dies.
+ // This method was added in version 2 of the bridge.
+ virtual void InitDebugFd(mozilla::DebugFdRegistry&) {}
+
+ // Register a list of malloc functions and hook functions to the
+ // replace-malloc library so that it can choose to dispatch to them
+ // when needed. The details of what is dispatched when is left to the
+ // replace-malloc library.
+ // Passing a nullptr for either table will unregister a previously
+ // registered table under the same name.
+ // Returns nullptr if registration failed.
+ // If registration succeeded, a table of "pure" malloc functions is
+ // returned. Those "pure" malloc functions won't call hooks.
+ // /!\ Do not rely on registration/unregistration to be instantaneous.
+ // Functions from a previously registered table may still be called for
+ // a brief time after RegisterHook returns.
+ // This method was added in version 3 of the bridge.
+ virtual const malloc_table_t* RegisterHook(
+ const char* aName, const malloc_table_t* aTable,
+ const malloc_hook_table_t* aHookTable) {
+ return nullptr;
+ }
+
+ // If this is a PHC-handled address, return true, and if an AddrInfo is
+ // provided, fill in all of its fields. Otherwise, return false and leave
+ // AddrInfo unchanged.
+ // This method was added in version 4 of the bridge.
+ virtual bool IsPHCAllocation(const void*, mozilla::phc::AddrInfo*) {
+ return false;
+ }
+
+ // Disable PHC allocations on the current thread. Only useful for tests. Note
+ // that PHC deallocations will still occur as needed.
+ // This method was added in version 4 of the bridge.
+ virtual void DisablePHCOnCurrentThread() {}
+
+ // Re-enable PHC allocations on the current thread. Only useful for tests.
+ // This method was added in version 4 of the bridge.
+ virtual void ReenablePHCOnCurrentThread() {}
+
+ // Test whether PHC allocations are enabled on the current thread. Only
+ // useful for tests.
+ // This method was added in version 4 of the bridge.
+ virtual bool IsPHCEnabledOnCurrentThread() { return false; }
+
+ // Return PHC memory usage information by filling in the supplied structure.
+ // This method was added in version 5 of the bridge.
+ virtual void PHCMemoryUsage(mozilla::phc::MemoryUsage& aMemoryUsage) {}
+
+# ifndef REPLACE_MALLOC_IMPL
+ // Returns the replace-malloc bridge if its version is at least the
+ // requested one.
+ static ReplaceMallocBridge* Get(int aMinimumVersion) {
+ static ReplaceMallocBridge* sSingleton = get_bridge();
+ return (sSingleton && sSingleton->mVersion >= aMinimumVersion) ? sSingleton
+ : nullptr;
+ }
+# endif
+
+ protected:
+ const int mVersion;
+};
+
+# ifndef REPLACE_MALLOC_IMPL
+// Class containing wrappers for calls to ReplaceMallocBridge methods.
+// Those wrappers need to be static methods in a class because compilers
+// complain about unused static global functions, and linkers complain
+// about multiple definitions of non-static global functions.
+// Using a separate class from ReplaceMallocBridge allows the function
+// names to be identical.
+struct ReplaceMalloc {
+ // Don't call this method from performance critical code. Use
+ // mozilla::dmd::DMDFuncs::Get() instead, it has less overhead.
+ static mozilla::dmd::DMDFuncs* GetDMDFuncs() {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 1);
+ return singleton ? singleton->GetDMDFuncs() : nullptr;
+ }
+
+ static void InitDebugFd(mozilla::DebugFdRegistry& aRegistry) {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 2);
+ if (singleton) {
+ singleton->InitDebugFd(aRegistry);
+ }
+ }
+
+ static const malloc_table_t* RegisterHook(
+ const char* aName, const malloc_table_t* aTable,
+ const malloc_hook_table_t* aHookTable) {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 3);
+ return singleton ? singleton->RegisterHook(aName, aTable, aHookTable)
+ : nullptr;
+ }
+
+ static bool IsPHCAllocation(const void* aPtr, mozilla::phc::AddrInfo* aOut) {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 4);
+ return singleton ? singleton->IsPHCAllocation(aPtr, aOut) : false;
+ }
+
+ static void DisablePHCOnCurrentThread() {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 4);
+ if (singleton) {
+ singleton->DisablePHCOnCurrentThread();
+ }
+ }
+
+ static void ReenablePHCOnCurrentThread() {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 4);
+ if (singleton) {
+ singleton->ReenablePHCOnCurrentThread();
+ }
+ }
+
+ static bool IsPHCEnabledOnCurrentThread() {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 4);
+ return singleton ? singleton->IsPHCEnabledOnCurrentThread() : false;
+ }
+
+ static void PHCMemoryUsage(mozilla::phc::MemoryUsage& aMemoryUsage) {
+ auto singleton = ReplaceMallocBridge::Get(/* minimumVersion */ 5);
+ if (singleton) {
+ singleton->PHCMemoryUsage(aMemoryUsage);
+ }
+ }
+};
+# endif
+
+#endif // __cplusplus
+
+#endif // replace_malloc_bridge_h
diff --git a/memory/build/test/TestMozJemallocUtils.cpp b/memory/build/test/TestMozJemallocUtils.cpp
new file mode 100644
index 0000000000..06a1a3b5a5
--- /dev/null
+++ b/memory/build/test/TestMozJemallocUtils.cpp
@@ -0,0 +1,152 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This is a cppunittest, rather than a gtest, in order to assert that no
+// additional DLL needs to be linked in to use the function(s) tested herein.
+
+#include <algorithm>
+#include <iostream>
+#include <optional>
+#include <sstream>
+#include <type_traits>
+
+#include "mozmemory_utils.h"
+#include "mozilla/Likely.h"
+
+static bool TESTS_FAILED = false;
+
+// Introduce iostream output operators for std::optional, for convenience's
+// sake.
+//
+// (This is technically undefined behavior per [namespace.std], but it's
+// unlikely to have any surprising effects when confined to this compilation
+// unit.)
+namespace std {
+template <typename T>
+std::ostream& operator<<(std::ostream& o, std::optional<T> const& s) {
+ if (s) {
+ return o << "std::optional{" << s.value() << "}";
+ }
+ return o << "std::nullopt";
+}
+std::ostream& operator<<(std::ostream& o, std::nullopt_t const& s) {
+ return o << "std::nullopt";
+}
+} // namespace std
+
+// EXPECT_EQ
+//
+// Assert that two expressions are equal. Print them, and their values, on
+// failure. (Based on the GTest macro of the same name.)
+template <typename X, typename Y, size_t Xn, size_t Yn>
+void AssertEqualImpl_(X&& x, Y&& y, const char* file, size_t line,
+ const char (&xStr)[Xn], const char (&yStr)[Yn],
+ const char* explanation = nullptr) {
+ if (MOZ_LIKELY(x == y)) return;
+
+ TESTS_FAILED = true;
+
+ std::stringstream sstr;
+ sstr << file << ':' << line << ": ";
+ if (explanation) sstr << explanation << "\n\t";
+ sstr << "expected " << xStr << " (" << x << ") == " << yStr << " (" << y
+ << ")\n";
+ std::cerr << sstr.str() << std::flush;
+}
+
+#define EXPECT_EQ(x, y) \
+ do { \
+ AssertEqualImpl_(x, y, __FILE__, __LINE__, #x, #y); \
+ } while (0)
+
+// STATIC_ASSERT_VALUE_IS_OF_TYPE
+//
+// Assert that a value `v` is of type `t` (ignoring cv-qualification).
+#define STATIC_ASSERT_VALUE_IS_OF_TYPE(v, t) \
+ static_assert(std::is_same_v<std::remove_cv_t<decltype(v)>, t>)
+
+// MockSleep
+//
+// Mock replacement for ::Sleep that merely logs its calls.
+struct MockSleep {
+ size_t calls = 0;
+ size_t sum = 0;
+
+ void operator()(size_t val) {
+ ++calls;
+ sum += val;
+ }
+
+ bool operator==(MockSleep const& that) const {
+ return calls == that.calls && sum == that.sum;
+ }
+};
+std::ostream& operator<<(std::ostream& o, MockSleep const& s) {
+ return o << "MockSleep { count: " << s.calls << ", sum: " << s.sum << " }";
+}
+
+// MockAlloc
+//
+// Mock memory allocation mechanism. Eventually returns a value.
+template <typename T>
+struct MockAlloc {
+ size_t count;
+ T value;
+
+ std::optional<T> operator()() {
+ if (!count--) return value;
+ return std::nullopt;
+ }
+};
+
+int main() {
+ using mozilla::StallSpecs;
+
+ const StallSpecs stall = {.maxAttempts = 10, .delayMs = 50};
+
+ // semantic test: stalls as requested but still yields a value,
+ // up until it doesn't
+ for (size_t i = 0; i < 20; ++i) {
+ MockSleep sleep;
+ auto const ret =
+ stall.StallAndRetry(sleep, MockAlloc<int>{.count = i, .value = 5});
+ STATIC_ASSERT_VALUE_IS_OF_TYPE(ret, std::optional<int>);
+
+ if (i < 10) {
+ EXPECT_EQ(ret, std::optional<int>(5));
+ } else {
+ EXPECT_EQ(ret, std::nullopt);
+ }
+ size_t const expectedCalls = std::min<size_t>(i + 1, 10);
+ EXPECT_EQ(sleep,
+ (MockSleep{.calls = expectedCalls, .sum = 50 * expectedCalls}));
+ }
+
+ // syntactic test: inline capturing lambda is accepted for aOperation
+ {
+ MockSleep sleep;
+ std::optional<int> value{42};
+ auto const ret = stall.StallAndRetry(sleep, [&]() { return value; });
+
+ STATIC_ASSERT_VALUE_IS_OF_TYPE(ret, std::optional<int>);
+ EXPECT_EQ(ret, std::optional(42));
+ EXPECT_EQ(sleep, (MockSleep{.calls = 1, .sum = 50}));
+ }
+
+ // syntactic test: inline capturing lambda is accepted for aDelayFunc
+ {
+ MockSleep sleep;
+ auto const ret =
+ stall.StallAndRetry([&](size_t time) { sleep(time); },
+ MockAlloc<int>{.count = 0, .value = 105});
+
+ STATIC_ASSERT_VALUE_IS_OF_TYPE(ret, std::optional<int>);
+ EXPECT_EQ(ret, std::optional(105));
+ EXPECT_EQ(sleep, (MockSleep{.calls = 1, .sum = 50}));
+ }
+
+ return TESTS_FAILED ? 1 : 0;
+}
diff --git a/memory/build/test/moz.build b/memory/build/test/moz.build
new file mode 100644
index 0000000000..df3d5c2db0
--- /dev/null
+++ b/memory/build/test/moz.build
@@ -0,0 +1,17 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# We don't link these tests against mozglue, but we do use the STL. Avoid the
+# implicit linking of `__imp_moz_xalloc` in our STL wrappers.
+DisableStlWrapping()
+
+# Important: for these tests to be run, they also need to be added
+# to testing/cppunittest.ini.
+CppUnitTests(
+ [
+ "TestMozJemallocUtils",
+ ]
+)
diff --git a/memory/build/zone.c b/memory/build/zone.c
new file mode 100644
index 0000000000..7311ccf27b
--- /dev/null
+++ b/memory/build/zone.c
@@ -0,0 +1,377 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozmemory_wrap.h"
+
+#include <stdlib.h>
+#include <mach/mach_types.h>
+#include "mozilla/Assertions.h"
+
+// Malloc implementation functions are MOZ_MEMORY_API, and jemalloc
+// specific functions MOZ_JEMALLOC_API; see mozmemory_wrap.h
+
+#define MALLOC_DECL(name, return_type, ...) \
+ MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+#include "malloc_decls.h"
+
+#define MALLOC_DECL(name, return_type, ...) \
+ MOZ_JEMALLOC_API return_type name##_impl(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_JEMALLOC
+#include "malloc_decls.h"
+
+// Definitions of the following structs in malloc/malloc.h might be too old
+// for the built binary to run on newer versions of OSX. So use the newest
+// possible version of those structs.
+
+typedef struct _malloc_zone_t {
+ void* reserved1;
+ void* reserved2;
+ size_t (*size)(struct _malloc_zone_t*, const void*);
+ void* (*malloc)(struct _malloc_zone_t*, size_t);
+ void* (*calloc)(struct _malloc_zone_t*, size_t, size_t);
+ void* (*valloc)(struct _malloc_zone_t*, size_t);
+ void (*free)(struct _malloc_zone_t*, void*);
+ void* (*realloc)(struct _malloc_zone_t*, void*, size_t);
+ void (*destroy)(struct _malloc_zone_t*);
+ const char* zone_name;
+ unsigned (*batch_malloc)(struct _malloc_zone_t*, size_t, void**, unsigned);
+ void (*batch_free)(struct _malloc_zone_t*, void**, unsigned);
+ struct malloc_introspection_t* introspect;
+ unsigned version;
+ void* (*memalign)(struct _malloc_zone_t*, size_t, size_t);
+ void (*free_definite_size)(struct _malloc_zone_t*, void*, size_t);
+ size_t (*pressure_relief)(struct _malloc_zone_t*, size_t);
+} malloc_zone_t;
+
+typedef struct {
+ vm_address_t address;
+ vm_size_t size;
+} vm_range_t;
+
+typedef struct malloc_statistics_t {
+ unsigned blocks_in_use;
+ size_t size_in_use;
+ size_t max_size_in_use;
+ size_t size_allocated;
+} malloc_statistics_t;
+
+typedef kern_return_t memory_reader_t(task_t, vm_address_t, vm_size_t, void**);
+
+typedef void vm_range_recorder_t(task_t, void*, unsigned type, vm_range_t*,
+ unsigned);
+
+typedef struct malloc_introspection_t {
+ kern_return_t (*enumerator)(task_t, void*, unsigned, vm_address_t,
+ memory_reader_t, vm_range_recorder_t);
+ size_t (*good_size)(malloc_zone_t*, size_t);
+ boolean_t (*check)(malloc_zone_t*);
+ void (*print)(malloc_zone_t*, boolean_t);
+ void (*log)(malloc_zone_t*, void*);
+ void (*force_lock)(malloc_zone_t*);
+ void (*force_unlock)(malloc_zone_t*);
+ void (*statistics)(malloc_zone_t*, malloc_statistics_t*);
+ boolean_t (*zone_locked)(malloc_zone_t*);
+ boolean_t (*enable_discharge_checking)(malloc_zone_t*);
+ boolean_t (*disable_discharge_checking)(malloc_zone_t*);
+ void (*discharge)(malloc_zone_t*, void*);
+#ifdef __BLOCKS__
+ void (*enumerate_discharged_pointers)(malloc_zone_t*, void (^)(void*, void*));
+#else
+ void* enumerate_unavailable_without_blocks;
+#endif
+ void (*reinit_lock)(malloc_zone_t*);
+} malloc_introspection_t;
+
+extern kern_return_t malloc_get_all_zones(task_t, memory_reader_t,
+ vm_address_t**, unsigned*);
+
+extern malloc_zone_t* malloc_default_zone(void);
+
+extern void malloc_zone_register(malloc_zone_t* zone);
+
+extern void malloc_zone_unregister(malloc_zone_t* zone);
+
+extern malloc_zone_t* malloc_default_purgeable_zone(void);
+
+extern malloc_zone_t* malloc_zone_from_ptr(const void* ptr);
+
+extern void malloc_zone_free(malloc_zone_t* zone, void* ptr);
+
+extern void* malloc_zone_realloc(malloc_zone_t* zone, void* ptr, size_t size);
+
+// The following is a OSX zone allocator implementation.
+// /!\ WARNING. It assumes the underlying malloc implementation's
+// malloc_usable_size returns 0 when the given pointer is not owned by
+// the allocator. Sadly, OSX does call zone_size with pointers not
+// owned by the allocator.
+
+static size_t zone_size(malloc_zone_t* zone, const void* ptr) {
+ return malloc_usable_size_impl(ptr);
+}
+
+static void* zone_malloc(malloc_zone_t* zone, size_t size) {
+ return malloc_impl(size);
+}
+
+static void* zone_calloc(malloc_zone_t* zone, size_t num, size_t size) {
+ return calloc_impl(num, size);
+}
+
+static void* zone_realloc(malloc_zone_t* zone, void* ptr, size_t size) {
+ if (malloc_usable_size_impl(ptr)) return realloc_impl(ptr, size);
+
+ // Sometimes, system libraries call malloc_zone_* functions with the wrong
+ // zone (e.g. CoreFoundation does). In that case, we need to find the real
+ // one. We can't call libSystem's realloc directly because we're exporting
+ // realloc from libmozglue and we'd pick that one, so we manually find the
+ // right zone and realloc with it.
+ malloc_zone_t* real_zone = malloc_zone_from_ptr(ptr);
+ // The system allocator crashes voluntarily by default when a pointer can't
+ // be traced back to a zone. Do the same.
+ MOZ_RELEASE_ASSERT(real_zone);
+ MOZ_RELEASE_ASSERT(real_zone != zone);
+ return malloc_zone_realloc(real_zone, ptr, size);
+}
+
+static void other_zone_free(malloc_zone_t* original_zone, void* ptr) {
+ // Sometimes, system libraries call malloc_zone_* functions with the wrong
+ // zone (e.g. CoreFoundation does). In that case, we need to find the real
+ // one. We can't call libSystem's free directly because we're exporting
+ // free from libmozglue and we'd pick that one, so we manually find the
+ // right zone and free with it.
+ if (!ptr) {
+ return;
+ }
+ malloc_zone_t* zone = malloc_zone_from_ptr(ptr);
+ // The system allocator crashes voluntarily by default when a pointer can't
+ // be traced back to a zone. Do the same.
+ MOZ_RELEASE_ASSERT(zone);
+ MOZ_RELEASE_ASSERT(zone != original_zone);
+ return malloc_zone_free(zone, ptr);
+}
+
+static void zone_free(malloc_zone_t* zone, void* ptr) {
+ if (malloc_usable_size_impl(ptr)) {
+ free_impl(ptr);
+ return;
+ }
+ other_zone_free(zone, ptr);
+}
+
+static void zone_free_definite_size(malloc_zone_t* zone, void* ptr,
+ size_t size) {
+ size_t current_size = malloc_usable_size_impl(ptr);
+ if (current_size) {
+ MOZ_ASSERT(current_size == size);
+ free_impl(ptr);
+ return;
+ }
+ other_zone_free(zone, ptr);
+}
+
+static void* zone_memalign(malloc_zone_t* zone, size_t alignment, size_t size) {
+ void* ptr;
+ if (posix_memalign_impl(&ptr, alignment, size) == 0) return ptr;
+ return NULL;
+}
+
+static void* zone_valloc(malloc_zone_t* zone, size_t size) {
+ return valloc_impl(size);
+}
+
+static void zone_destroy(malloc_zone_t* zone) {
+ // This function should never be called.
+ MOZ_CRASH();
+}
+
+static unsigned zone_batch_malloc(malloc_zone_t* zone, size_t size,
+ void** results, unsigned num_requested) {
+ unsigned i;
+
+ for (i = 0; i < num_requested; i++) {
+ results[i] = malloc_impl(size);
+ if (!results[i]) break;
+ }
+
+ return i;
+}
+
+static void zone_batch_free(malloc_zone_t* zone, void** to_be_freed,
+ unsigned num_to_be_freed) {
+ unsigned i;
+
+ for (i = 0; i < num_to_be_freed; i++) {
+ zone_free(zone, to_be_freed[i]);
+ to_be_freed[i] = NULL;
+ }
+}
+
+static size_t zone_pressure_relief(malloc_zone_t* zone, size_t goal) {
+ return 0;
+}
+
+static size_t zone_good_size(malloc_zone_t* zone, size_t size) {
+ return malloc_good_size_impl(size);
+}
+
+static kern_return_t zone_enumerator(task_t task, void* data,
+ unsigned type_mask,
+ vm_address_t zone_address,
+ memory_reader_t reader,
+ vm_range_recorder_t recorder) {
+ return KERN_SUCCESS;
+}
+
+static boolean_t zone_check(malloc_zone_t* zone) { return true; }
+
+static void zone_print(malloc_zone_t* zone, boolean_t verbose) {}
+
+static void zone_log(malloc_zone_t* zone, void* address) {}
+
+extern void _malloc_prefork(void);
+extern void _malloc_postfork_child(void);
+
+static void zone_force_lock(malloc_zone_t* zone) {
+ // /!\ This calls into mozjemalloc. It works because we're linked in the
+ // same library.
+ _malloc_prefork();
+}
+
+static void zone_force_unlock(malloc_zone_t* zone) {
+ // /!\ This calls into mozjemalloc. It works because we're linked in the
+ // same library.
+ _malloc_postfork_child();
+}
+
+static void zone_statistics(malloc_zone_t* zone, malloc_statistics_t* stats) {
+ // We make no effort to actually fill the values
+ stats->blocks_in_use = 0;
+ stats->size_in_use = 0;
+ stats->max_size_in_use = 0;
+ stats->size_allocated = 0;
+}
+
+static boolean_t zone_locked(malloc_zone_t* zone) {
+ // Pretend no lock is being held
+ return false;
+}
+
+static void zone_reinit_lock(malloc_zone_t* zone) {
+ // As of OSX 10.12, this function is only used when force_unlock would
+ // be used if the zone version were < 9. So just use force_unlock.
+ zone_force_unlock(zone);
+}
+
+static malloc_zone_t zone;
+static struct malloc_introspection_t zone_introspect;
+
+static malloc_zone_t* get_default_zone() {
+ malloc_zone_t** zones = NULL;
+ unsigned int num_zones = 0;
+
+ // On OSX 10.12, malloc_default_zone returns a special zone that is not
+ // present in the list of registered zones. That zone uses a "lite zone"
+ // if one is present (apparently enabled when malloc stack logging is
+ // enabled), or the first registered zone otherwise. In practice this
+ // means unless malloc stack logging is enabled, the first registered
+ // zone is the default.
+ // So get the list of zones to get the first one, instead of relying on
+ // malloc_default_zone.
+ if (KERN_SUCCESS !=
+ malloc_get_all_zones(0, NULL, (vm_address_t**)&zones, &num_zones)) {
+ // Reset the value in case the failure happened after it was set.
+ num_zones = 0;
+ }
+ if (num_zones) {
+ return zones[0];
+ }
+ return malloc_default_zone();
+}
+
+__attribute__((constructor)) static void register_zone(void) {
+ malloc_zone_t* default_zone = get_default_zone();
+
+ zone.size = zone_size;
+ zone.malloc = zone_malloc;
+ zone.calloc = zone_calloc;
+ zone.valloc = zone_valloc;
+ zone.free = zone_free;
+ zone.realloc = zone_realloc;
+ zone.destroy = zone_destroy;
+#ifdef MOZ_REPLACE_MALLOC
+ zone.zone_name = "replace_malloc_zone";
+#else
+ zone.zone_name = "jemalloc_zone";
+#endif
+ zone.batch_malloc = zone_batch_malloc;
+ zone.batch_free = zone_batch_free;
+ zone.introspect = &zone_introspect;
+ zone.version = 9;
+ zone.memalign = zone_memalign;
+ zone.free_definite_size = zone_free_definite_size;
+ zone.pressure_relief = zone_pressure_relief;
+ zone_introspect.enumerator = zone_enumerator;
+ zone_introspect.good_size = zone_good_size;
+ zone_introspect.check = zone_check;
+ zone_introspect.print = zone_print;
+ zone_introspect.log = zone_log;
+ zone_introspect.force_lock = zone_force_lock;
+ zone_introspect.force_unlock = zone_force_unlock;
+ zone_introspect.statistics = zone_statistics;
+ zone_introspect.zone_locked = zone_locked;
+ zone_introspect.enable_discharge_checking = NULL;
+ zone_introspect.disable_discharge_checking = NULL;
+ zone_introspect.discharge = NULL;
+#ifdef __BLOCKS__
+ zone_introspect.enumerate_discharged_pointers = NULL;
+#else
+ zone_introspect.enumerate_unavailable_without_blocks = NULL;
+#endif
+ zone_introspect.reinit_lock = zone_reinit_lock;
+
+ // The default purgeable zone is created lazily by OSX's libc. It uses
+ // the default zone when it is created for "small" allocations
+ // (< 15 KiB), but assumes the default zone is a scalable_zone. This
+ // obviously fails when the default zone is the jemalloc zone, so
+ // malloc_default_purgeable_zone is called beforehand so that the
+ // default purgeable zone is created when the default zone is still
+ // a scalable_zone.
+ malloc_zone_t* purgeable_zone = malloc_default_purgeable_zone();
+
+ // There is a problem related to the above with the system nano zone, which
+ // is hard to work around from here, and that is instead worked around by
+ // disabling the nano zone through an environment variable
+ // (MallocNanoZone=0). In Firefox, we do that through
+ // browser/app/macbuild/Contents/Info.plist.in.
+
+ // Register the custom zone. At this point it won't be the default.
+ malloc_zone_register(&zone);
+
+ do {
+ // Unregister and reregister the default zone. On OSX >= 10.6,
+ // unregistering takes the last registered zone and places it at the
+ // location of the specified zone. Unregistering the default zone thus
+ // makes the last registered one the default. On OSX < 10.6,
+ // unregistering shifts all registered zones. The first registered zone
+ // then becomes the default.
+ malloc_zone_unregister(default_zone);
+ malloc_zone_register(default_zone);
+
+ // On OSX 10.6, having the default purgeable zone appear before the default
+ // zone makes some things crash because it thinks it owns the default
+ // zone allocated pointers. We thus unregister/re-register it in order to
+ // ensure it's always after the default zone. On OSX < 10.6, as
+ // unregistering shifts registered zones, this simply removes the purgeable
+ // zone from the list and adds it back at the end, after the default zone.
+ // On OSX >= 10.6, unregistering replaces the purgeable zone with the last
+ // registered zone above, i.e the default zone. Registering it again then
+ // puts it at the end, obviously after the default zone.
+ malloc_zone_unregister(purgeable_zone);
+ malloc_zone_register(purgeable_zone);
+ default_zone = get_default_zone();
+ } while (default_zone != &zone);
+}
diff --git a/memory/gtest/TestJemalloc.cpp b/memory/gtest/TestJemalloc.cpp
new file mode 100644
index 0000000000..7f3b3f9cf3
--- /dev/null
+++ b/memory/gtest/TestJemalloc.cpp
@@ -0,0 +1,756 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/mozalloc.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/Vector.h"
+#include "mozilla/gtest/MozHelpers.h"
+#include "mozmemory.h"
+#include "nsCOMPtr.h"
+#include "Utils.h"
+
+#include "gtest/gtest.h"
+
+#ifdef MOZ_PHC
+# include "replace_malloc_bridge.h"
+#endif
+
+using namespace mozilla;
+
+class AutoDisablePHCOnCurrentThread {
+ public:
+ AutoDisablePHCOnCurrentThread() {
+#ifdef MOZ_PHC
+ ReplaceMalloc::DisablePHCOnCurrentThread();
+#endif
+ }
+
+ ~AutoDisablePHCOnCurrentThread() {
+#ifdef MOZ_PHC
+ ReplaceMalloc::ReenablePHCOnCurrentThread();
+#endif
+ }
+};
+
+static inline void TestOne(size_t size) {
+ size_t req = size;
+ size_t adv = malloc_good_size(req);
+ char* p = (char*)malloc(req);
+ size_t usable = moz_malloc_usable_size(p);
+ // NB: Using EXPECT here so that we still free the memory on failure.
+ EXPECT_EQ(adv, usable) << "malloc_good_size(" << req << ") --> " << adv
+ << "; "
+ "malloc_usable_size("
+ << req << ") --> " << usable;
+ free(p);
+}
+
+static inline void TestThree(size_t size) {
+ ASSERT_NO_FATAL_FAILURE(TestOne(size - 1));
+ ASSERT_NO_FATAL_FAILURE(TestOne(size));
+ ASSERT_NO_FATAL_FAILURE(TestOne(size + 1));
+}
+
+TEST(Jemalloc, UsableSizeInAdvance)
+{
+ /*
+ * Test every size up to a certain point, then (N-1, N, N+1) triplets for a
+ * various sizes beyond that.
+ */
+
+ for (size_t n = 0; n < 16_KiB; n++) ASSERT_NO_FATAL_FAILURE(TestOne(n));
+
+ for (size_t n = 16_KiB; n < 1_MiB; n += 4_KiB)
+ ASSERT_NO_FATAL_FAILURE(TestThree(n));
+
+ for (size_t n = 1_MiB; n < 8_MiB; n += 128_KiB)
+ ASSERT_NO_FATAL_FAILURE(TestThree(n));
+}
+
+static int gStaticVar;
+
+bool InfoEq(jemalloc_ptr_info_t& aInfo, PtrInfoTag aTag, void* aAddr,
+ size_t aSize, arena_id_t arenaId) {
+ return aInfo.tag == aTag && aInfo.addr == aAddr && aInfo.size == aSize
+#ifdef MOZ_DEBUG
+ && aInfo.arenaId == arenaId
+#endif
+ ;
+}
+
+bool InfoEqFreedPage(jemalloc_ptr_info_t& aInfo, void* aAddr, size_t aPageSize,
+ arena_id_t arenaId) {
+ size_t pageSizeMask = aPageSize - 1;
+
+ return jemalloc_ptr_is_freed_page(&aInfo) &&
+ aInfo.addr == (void*)(uintptr_t(aAddr) & ~pageSizeMask) &&
+ aInfo.size == aPageSize
+#ifdef MOZ_DEBUG
+ && aInfo.arenaId == arenaId
+#endif
+ ;
+}
+
+TEST(Jemalloc, PtrInfo)
+{
+ arena_id_t arenaId = moz_create_arena();
+ ASSERT_TRUE(arenaId != 0);
+
+ jemalloc_stats_t stats;
+ jemalloc_stats(&stats);
+
+ jemalloc_ptr_info_t info;
+ Vector<char*> small, large, huge;
+
+ // For small (less than half the page size) allocations, test every position
+ // within many possible sizes.
+ size_t small_max =
+ stats.subpage_max ? stats.subpage_max : stats.quantum_wide_max;
+ for (size_t n = 0; n <= small_max; n += 8) {
+ auto p = (char*)moz_arena_malloc(arenaId, n);
+ size_t usable = moz_malloc_size_of(p);
+ ASSERT_TRUE(small.append(p));
+ for (size_t j = 0; j < usable; j++) {
+ jemalloc_ptr_info(&p[j], &info);
+ ASSERT_TRUE(InfoEq(info, TagLiveAlloc, p, usable, arenaId));
+ }
+ }
+
+ // Similar for large (small_max + 1 KiB .. 1MiB - 8KiB) allocations.
+ for (size_t n = small_max + 1_KiB; n <= stats.large_max; n += 1_KiB) {
+ auto p = (char*)moz_arena_malloc(arenaId, n);
+ size_t usable = moz_malloc_size_of(p);
+ ASSERT_TRUE(large.append(p));
+ for (size_t j = 0; j < usable; j += 347) {
+ jemalloc_ptr_info(&p[j], &info);
+ ASSERT_TRUE(InfoEq(info, TagLiveAlloc, p, usable, arenaId));
+ }
+ }
+
+ // Similar for huge (> 1MiB - 8KiB) allocations.
+ for (size_t n = stats.chunksize; n <= 10_MiB; n += 512_KiB) {
+ auto p = (char*)moz_arena_malloc(arenaId, n);
+ size_t usable = moz_malloc_size_of(p);
+ ASSERT_TRUE(huge.append(p));
+ for (size_t j = 0; j < usable; j += 567) {
+ jemalloc_ptr_info(&p[j], &info);
+ ASSERT_TRUE(InfoEq(info, TagLiveAlloc, p, usable, arenaId));
+ }
+ }
+
+ // The following loops check freed allocations. We step through the vectors
+ // using prime-sized steps, which gives full coverage of the arrays while
+ // avoiding deallocating in the same order we allocated.
+ size_t len;
+
+ // Free the small allocations and recheck them.
+ int isFreedAlloc = 0, isFreedPage = 0;
+ len = small.length();
+ for (size_t i = 0, j = 0; i < len; i++, j = (j + 19) % len) {
+ char* p = small[j];
+ size_t usable = moz_malloc_size_of(p);
+ free(p);
+ for (size_t k = 0; k < usable; k++) {
+ jemalloc_ptr_info(&p[k], &info);
+ // There are two valid outcomes here.
+ if (InfoEq(info, TagFreedAlloc, p, usable, arenaId)) {
+ isFreedAlloc++;
+ } else if (InfoEqFreedPage(info, &p[k], stats.page_size, arenaId)) {
+ isFreedPage++;
+ } else {
+ ASSERT_TRUE(false);
+ }
+ }
+ }
+ // There should be both FreedAlloc and FreedPage results, but a lot more of
+ // the former.
+ ASSERT_TRUE(isFreedAlloc != 0);
+ ASSERT_TRUE(isFreedPage != 0);
+ ASSERT_TRUE(isFreedAlloc / isFreedPage > 8);
+
+ // Free the large allocations and recheck them.
+ len = large.length();
+ for (size_t i = 0, j = 0; i < len; i++, j = (j + 31) % len) {
+ char* p = large[j];
+ size_t usable = moz_malloc_size_of(p);
+ free(p);
+ for (size_t k = 0; k < usable; k += 357) {
+ jemalloc_ptr_info(&p[k], &info);
+ ASSERT_TRUE(InfoEqFreedPage(info, &p[k], stats.page_size, arenaId));
+ }
+ }
+
+ // Free the huge allocations and recheck them.
+ len = huge.length();
+ for (size_t i = 0, j = 0; i < len; i++, j = (j + 7) % len) {
+ char* p = huge[j];
+ size_t usable = moz_malloc_size_of(p);
+ free(p);
+ for (size_t k = 0; k < usable; k += 587) {
+ jemalloc_ptr_info(&p[k], &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+ }
+ }
+
+ // Null ptr.
+ jemalloc_ptr_info(nullptr, &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+
+ // Near-null ptr.
+ jemalloc_ptr_info((void*)0x123, &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+
+ // Maximum address.
+ jemalloc_ptr_info((void*)uintptr_t(-1), &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+
+ // Stack memory.
+ int stackVar;
+ jemalloc_ptr_info(&stackVar, &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+
+ // Code memory.
+ jemalloc_ptr_info((const void*)&jemalloc_ptr_info, &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+
+ // Static memory.
+ jemalloc_ptr_info(&gStaticVar, &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+
+ // Chunk header.
+ UniquePtr<int> p = MakeUnique<int>();
+ size_t chunksizeMask = stats.chunksize - 1;
+ char* chunk = (char*)(uintptr_t(p.get()) & ~chunksizeMask);
+ size_t chunkHeaderSize = stats.chunksize - stats.large_max - stats.page_size;
+ for (size_t i = 0; i < chunkHeaderSize; i += 64) {
+ jemalloc_ptr_info(&chunk[i], &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+ }
+
+ // Run header.
+ size_t page_sizeMask = stats.page_size - 1;
+ char* run = (char*)(uintptr_t(p.get()) & ~page_sizeMask);
+ for (size_t i = 0; i < 4 * sizeof(void*); i++) {
+ jemalloc_ptr_info(&run[i], &info);
+ ASSERT_TRUE(InfoEq(info, TagUnknown, nullptr, 0U, 0U));
+ }
+
+ // Entire chunk. It's impossible to check what is put into |info| for all of
+ // these addresses; this is more about checking that we don't crash.
+ for (size_t i = 0; i < stats.chunksize; i += 256) {
+ jemalloc_ptr_info(&chunk[i], &info);
+ }
+
+ moz_dispose_arena(arenaId);
+}
+
+size_t sSizes[] = {1, 42, 79, 918, 1.4_KiB,
+ 73_KiB, 129_KiB, 1.1_MiB, 2.6_MiB, 5.1_MiB};
+
+TEST(Jemalloc, Arenas)
+{
+ arena_id_t arena = moz_create_arena();
+ ASSERT_TRUE(arena != 0);
+ void* ptr = moz_arena_malloc(arena, 42);
+ ASSERT_TRUE(ptr != nullptr);
+ ptr = moz_arena_realloc(arena, ptr, 64);
+ ASSERT_TRUE(ptr != nullptr);
+ moz_arena_free(arena, ptr);
+ ptr = moz_arena_calloc(arena, 24, 2);
+ // For convenience, free can be used to free arena pointers.
+ free(ptr);
+ moz_dispose_arena(arena);
+
+ // Avoid death tests adding some unnecessary (long) delays.
+ SAVE_GDB_SLEEP_LOCAL();
+
+ // Can't use an arena after it's disposed.
+ // ASSERT_DEATH_WRAP(moz_arena_malloc(arena, 80), "");
+
+ // Arena id 0 can't be used to somehow get to the main arena.
+ ASSERT_DEATH_WRAP(moz_arena_malloc(0, 80), "");
+
+ arena = moz_create_arena();
+ arena_id_t arena2 = moz_create_arena();
+ // Ensure arena2 is used to prevent OSX errors:
+ (void)arena2;
+
+ // For convenience, realloc can also be used to reallocate arena pointers.
+ // The result should be in the same arena. Test various size class
+ // transitions.
+ for (size_t from_size : sSizes) {
+ SCOPED_TRACE(testing::Message() << "from_size = " << from_size);
+ for (size_t to_size : sSizes) {
+ SCOPED_TRACE(testing::Message() << "to_size = " << to_size);
+ ptr = moz_arena_malloc(arena, from_size);
+ ptr = realloc(ptr, to_size);
+ // Freeing with the wrong arena should crash.
+ ASSERT_DEATH_WRAP(moz_arena_free(arena2, ptr), "");
+ // Likewise for moz_arena_realloc.
+ ASSERT_DEATH_WRAP(moz_arena_realloc(arena2, ptr, from_size), "");
+ // The following will crash if it's not in the right arena.
+ moz_arena_free(arena, ptr);
+ }
+ }
+
+ moz_dispose_arena(arena2);
+ moz_dispose_arena(arena);
+
+ RESTORE_GDB_SLEEP_LOCAL();
+}
+
+// Check that a buffer aPtr is entirely filled with a given character from
+// aOffset to aSize. For faster comparison, the caller is required to fill a
+// reference buffer with the wanted character, and give the size of that
+// reference buffer.
+static void bulk_compare(char* aPtr, size_t aOffset, size_t aSize,
+ char* aReference, size_t aReferenceSize) {
+ for (size_t i = aOffset; i < aSize; i += aReferenceSize) {
+ size_t length = std::min(aSize - i, aReferenceSize);
+ if (memcmp(aPtr + i, aReference, length)) {
+ // We got a mismatch, we now want to report more precisely where.
+ for (size_t j = i; j < i + length; j++) {
+ ASSERT_EQ(aPtr[j], *aReference);
+ }
+ }
+ }
+}
+
+// A range iterator for size classes between two given values.
+class SizeClassesBetween {
+ public:
+ SizeClassesBetween(size_t aStart, size_t aEnd) : mStart(aStart), mEnd(aEnd) {}
+
+ class Iterator {
+ public:
+ explicit Iterator(size_t aValue) : mValue(malloc_good_size(aValue)) {}
+
+ operator size_t() const { return mValue; }
+ size_t operator*() const { return mValue; }
+ Iterator& operator++() {
+ mValue = malloc_good_size(mValue + 1);
+ return *this;
+ }
+
+ private:
+ size_t mValue;
+ };
+
+ Iterator begin() { return Iterator(mStart); }
+ Iterator end() { return Iterator(mEnd); }
+
+ private:
+ size_t mStart, mEnd;
+};
+
+#define ALIGNMENT_CEILING(s, alignment) \
+ (((s) + ((alignment)-1)) & (~((alignment)-1)))
+
+#define ALIGNMENT_FLOOR(s, alignment) ((s) & (~((alignment)-1)))
+
+static bool IsSameRoundedHugeClass(size_t aSize1, size_t aSize2,
+ jemalloc_stats_t& aStats) {
+ return (aSize1 > aStats.large_max && aSize2 > aStats.large_max &&
+ ALIGNMENT_CEILING(aSize1 + aStats.page_size, aStats.chunksize) ==
+ ALIGNMENT_CEILING(aSize2 + aStats.page_size, aStats.chunksize));
+}
+
+static bool CanReallocInPlace(size_t aFromSize, size_t aToSize,
+ jemalloc_stats_t& aStats) {
+ // PHC allocations must be disabled because PHC reallocs differently to
+ // mozjemalloc.
+#ifdef MOZ_PHC
+ MOZ_RELEASE_ASSERT(!ReplaceMalloc::IsPHCEnabledOnCurrentThread());
+#endif
+
+ if (aFromSize == malloc_good_size(aToSize)) {
+ // Same size class: in-place.
+ return true;
+ }
+ if (aFromSize >= aStats.page_size && aFromSize <= aStats.large_max &&
+ aToSize >= aStats.page_size && aToSize <= aStats.large_max) {
+ // Any large class to any large class: in-place when there is space to.
+ return true;
+ }
+ if (IsSameRoundedHugeClass(aFromSize, aToSize, aStats)) {
+ // Huge sizes that round up to the same multiple of the chunk size:
+ // in-place.
+ return true;
+ }
+ return false;
+}
+
+TEST(Jemalloc, InPlace)
+{
+ // Disable PHC allocations for this test, because CanReallocInPlace() isn't
+ // valid for PHC allocations.
+ AutoDisablePHCOnCurrentThread disable;
+
+ jemalloc_stats_t stats;
+ jemalloc_stats(&stats);
+
+ // Using a separate arena, which is always emptied after an iteration, ensures
+ // that in-place reallocation happens in all cases it can happen. This test is
+ // intended for developers to notice they may have to adapt other tests if
+ // they change the conditions for in-place reallocation.
+ arena_id_t arena = moz_create_arena();
+
+ for (size_t from_size : SizeClassesBetween(1, 2 * stats.chunksize)) {
+ SCOPED_TRACE(testing::Message() << "from_size = " << from_size);
+ for (size_t to_size : sSizes) {
+ SCOPED_TRACE(testing::Message() << "to_size = " << to_size);
+ char* ptr = (char*)moz_arena_malloc(arena, from_size);
+ char* ptr2 = (char*)moz_arena_realloc(arena, ptr, to_size);
+ if (CanReallocInPlace(from_size, to_size, stats)) {
+ EXPECT_EQ(ptr, ptr2);
+ } else {
+ EXPECT_NE(ptr, ptr2);
+ }
+ moz_arena_free(arena, ptr2);
+ }
+ }
+
+ moz_dispose_arena(arena);
+}
+
+// Bug 1474254: disable this test for windows ccov builds because it leads to
+// timeout.
+#if !defined(XP_WIN) || !defined(MOZ_CODE_COVERAGE)
+TEST(Jemalloc, JunkPoison)
+{
+ // Disable PHC allocations for this test, because CanReallocInPlace() isn't
+ // valid for PHC allocations, and the testing UAFs aren't valid.
+ AutoDisablePHCOnCurrentThread disable;
+
+ jemalloc_stats_t stats;
+ jemalloc_stats(&stats);
+
+ // Avoid death tests adding some unnecessary (long) delays.
+ SAVE_GDB_SLEEP_LOCAL();
+
+ // Create buffers in a separate arena, for faster comparisons with
+ // bulk_compare.
+ arena_id_t buf_arena = moz_create_arena();
+ char* junk_buf = (char*)moz_arena_malloc(buf_arena, stats.page_size);
+ // Depending on its configuration, the allocator will either fill the
+ // requested allocation with the junk byte (0xe4) or with zeroes, or do
+ // nothing, in which case, since we're allocating in a fresh arena,
+ // we'll be getting zeroes.
+ char junk = stats.opt_junk ? '\xe4' : '\0';
+ for (size_t i = 0; i < stats.page_size; i++) {
+ ASSERT_EQ(junk_buf[i], junk);
+ }
+
+ char* poison_buf = (char*)moz_arena_malloc(buf_arena, stats.page_size);
+ memset(poison_buf, 0xe5, stats.page_size);
+
+ static const char fill = 0x42;
+ char* fill_buf = (char*)moz_arena_malloc(buf_arena, stats.page_size);
+ memset(fill_buf, fill, stats.page_size);
+
+ arena_params_t params;
+ // Allow as many dirty pages in the arena as possible, so that purge never
+ // happens in it. Purge breaks some of the tests below randomly depending on
+ // what other things happen on other threads.
+ params.mMaxDirty = size_t(-1);
+ arena_id_t arena = moz_create_arena_with_params(&params);
+
+ // Allocating should junk the buffer, and freeing should poison the buffer.
+ for (size_t size : sSizes) {
+ if (size <= stats.large_max) {
+ SCOPED_TRACE(testing::Message() << "size = " << size);
+ char* buf = (char*)moz_arena_malloc(arena, size);
+ size_t allocated = moz_malloc_usable_size(buf);
+ if (stats.opt_junk || stats.opt_zero) {
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(buf, 0, allocated, junk_buf, stats.page_size));
+ }
+ moz_arena_free(arena, buf);
+ // We purposefully do a use-after-free here, to check that the data was
+ // poisoned.
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(buf, 0, allocated, poison_buf, stats.page_size));
+ }
+ }
+
+ // Shrinking in the same size class should be in place and poison between the
+ // new allocation size and the old one.
+ size_t prev = 0;
+ for (size_t size : SizeClassesBetween(1, 2 * stats.chunksize)) {
+ SCOPED_TRACE(testing::Message() << "size = " << size);
+ SCOPED_TRACE(testing::Message() << "prev = " << prev);
+ char* ptr = (char*)moz_arena_malloc(arena, size);
+ memset(ptr, fill, moz_malloc_usable_size(ptr));
+ char* ptr2 = (char*)moz_arena_realloc(arena, ptr, prev + 1);
+ ASSERT_EQ(ptr, ptr2);
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr, 0, prev + 1, fill_buf, stats.page_size));
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr, prev + 1, size, poison_buf, stats.page_size));
+ moz_arena_free(arena, ptr);
+ prev = size;
+ }
+
+ // In-place realloc should junk the new bytes when growing and poison the old
+ // bytes when shrinking.
+ for (size_t from_size : SizeClassesBetween(1, 2 * stats.chunksize)) {
+ SCOPED_TRACE(testing::Message() << "from_size = " << from_size);
+ for (size_t to_size : sSizes) {
+ SCOPED_TRACE(testing::Message() << "to_size = " << to_size);
+ if (CanReallocInPlace(from_size, to_size, stats)) {
+ char* ptr = (char*)moz_arena_malloc(arena, from_size);
+ memset(ptr, fill, moz_malloc_usable_size(ptr));
+ char* ptr2 = (char*)moz_arena_realloc(arena, ptr, to_size);
+ ASSERT_EQ(ptr, ptr2);
+ // Shrinking allocation
+ if (from_size >= to_size) {
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr, 0, to_size, fill_buf, stats.page_size));
+ // Huge allocations have guards and will crash when accessing
+ // beyond the valid range.
+ if (to_size > stats.large_max) {
+ size_t page_limit = ALIGNMENT_CEILING(to_size, stats.page_size);
+ ASSERT_NO_FATAL_FAILURE(bulk_compare(ptr, to_size, page_limit,
+ poison_buf, stats.page_size));
+ ASSERT_DEATH_WRAP(ptr[page_limit] = 0, "");
+ } else {
+ ASSERT_NO_FATAL_FAILURE(bulk_compare(ptr, to_size, from_size,
+ poison_buf, stats.page_size));
+ }
+ } else {
+ // Enlarging allocation
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr, 0, from_size, fill_buf, stats.page_size));
+ if (stats.opt_junk || stats.opt_zero) {
+ ASSERT_NO_FATAL_FAILURE(bulk_compare(ptr, from_size, to_size,
+ junk_buf, stats.page_size));
+ }
+ // Huge allocation, so should have a guard page following
+ if (to_size > stats.large_max) {
+ ASSERT_DEATH_WRAP(
+ ptr[ALIGNMENT_CEILING(to_size, stats.page_size)] = 0, "");
+ }
+ }
+ moz_arena_free(arena, ptr2);
+ }
+ }
+ }
+
+ // Growing to a different size class should poison the old allocation,
+ // preserve the original bytes, and junk the new bytes in the new allocation.
+ for (size_t from_size : SizeClassesBetween(1, 2 * stats.chunksize)) {
+ SCOPED_TRACE(testing::Message() << "from_size = " << from_size);
+ for (size_t to_size : sSizes) {
+ if (from_size < to_size && malloc_good_size(to_size) != from_size &&
+ !IsSameRoundedHugeClass(from_size, to_size, stats)) {
+ SCOPED_TRACE(testing::Message() << "to_size = " << to_size);
+ char* ptr = (char*)moz_arena_malloc(arena, from_size);
+ memset(ptr, fill, moz_malloc_usable_size(ptr));
+ // Avoid in-place realloc by allocating a buffer, expecting it to be
+ // right after the buffer we just received. Buffers smaller than the
+ // page size and exactly or larger than the size of the largest large
+ // size class can't be reallocated in-place.
+ char* avoid_inplace = nullptr;
+ if (from_size >= stats.page_size && from_size < stats.large_max) {
+ avoid_inplace = (char*)moz_arena_malloc(arena, stats.page_size);
+ ASSERT_EQ(ptr + from_size, avoid_inplace);
+ }
+ char* ptr2 = (char*)moz_arena_realloc(arena, ptr, to_size);
+ ASSERT_NE(ptr, ptr2);
+ if (from_size <= stats.large_max) {
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr, 0, from_size, poison_buf, stats.page_size));
+ }
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr2, 0, from_size, fill_buf, stats.page_size));
+ if (stats.opt_junk || stats.opt_zero) {
+ size_t rounded_to_size = malloc_good_size(to_size);
+ ASSERT_NE(to_size, rounded_to_size);
+ ASSERT_NO_FATAL_FAILURE(bulk_compare(ptr2, from_size, rounded_to_size,
+ junk_buf, stats.page_size));
+ }
+ moz_arena_free(arena, ptr2);
+ moz_arena_free(arena, avoid_inplace);
+ }
+ }
+ }
+
+ // Shrinking to a different size class should poison the old allocation,
+ // preserve the original bytes, and junk the extra bytes in the new
+ // allocation.
+ for (size_t from_size : SizeClassesBetween(1, 2 * stats.chunksize)) {
+ SCOPED_TRACE(testing::Message() << "from_size = " << from_size);
+ for (size_t to_size : sSizes) {
+ if (from_size > to_size &&
+ !CanReallocInPlace(from_size, to_size, stats)) {
+ SCOPED_TRACE(testing::Message() << "to_size = " << to_size);
+ char* ptr = (char*)moz_arena_malloc(arena, from_size);
+ memset(ptr, fill, from_size);
+ char* ptr2 = (char*)moz_arena_realloc(arena, ptr, to_size);
+ ASSERT_NE(ptr, ptr2);
+ if (from_size <= stats.large_max) {
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr, 0, from_size, poison_buf, stats.page_size));
+ }
+ ASSERT_NO_FATAL_FAILURE(
+ bulk_compare(ptr2, 0, to_size, fill_buf, stats.page_size));
+ if (stats.opt_junk || stats.opt_zero) {
+ size_t rounded_to_size = malloc_good_size(to_size);
+ ASSERT_NE(to_size, rounded_to_size);
+ ASSERT_NO_FATAL_FAILURE(bulk_compare(ptr2, from_size, rounded_to_size,
+ junk_buf, stats.page_size));
+ }
+ moz_arena_free(arena, ptr2);
+ }
+ }
+ }
+
+ moz_dispose_arena(arena);
+
+ moz_arena_free(buf_arena, poison_buf);
+ moz_arena_free(buf_arena, junk_buf);
+ moz_arena_free(buf_arena, fill_buf);
+ moz_dispose_arena(buf_arena);
+
+ RESTORE_GDB_SLEEP_LOCAL();
+}
+#endif // !defined(XP_WIN) || !defined(MOZ_CODE_COVERAGE)
+
+TEST(Jemalloc, TrailingGuard)
+{
+ // Disable PHC allocations for this test, because even a single PHC
+ // allocation occurring can throw it off.
+ AutoDisablePHCOnCurrentThread disable;
+
+ jemalloc_stats_t stats;
+ jemalloc_stats(&stats);
+
+ // Avoid death tests adding some unnecessary (long) delays.
+ SAVE_GDB_SLEEP_LOCAL();
+
+ arena_id_t arena = moz_create_arena();
+ ASSERT_TRUE(arena != 0);
+
+ // Do enough large allocations to fill a chunk, and then one additional one,
+ // and check that the guard page is still present after the one-but-last
+ // allocation, i.e. that we didn't allocate the guard.
+ Vector<void*> ptr_list;
+ for (size_t cnt = 0; cnt < stats.large_max / stats.page_size; cnt++) {
+ void* ptr = moz_arena_malloc(arena, stats.page_size);
+ ASSERT_TRUE(ptr != nullptr);
+ ASSERT_TRUE(ptr_list.append(ptr));
+ }
+
+ void* last_ptr_in_chunk = ptr_list[ptr_list.length() - 1];
+ void* extra_ptr = moz_arena_malloc(arena, stats.page_size);
+ void* guard_page = (void*)ALIGNMENT_CEILING(
+ (uintptr_t)last_ptr_in_chunk + stats.page_size, stats.page_size);
+ jemalloc_ptr_info_t info;
+ jemalloc_ptr_info(guard_page, &info);
+ ASSERT_TRUE(jemalloc_ptr_is_freed_page(&info));
+
+ ASSERT_DEATH_WRAP(*(char*)guard_page = 0, "");
+
+ for (void* ptr : ptr_list) {
+ moz_arena_free(arena, ptr);
+ }
+ moz_arena_free(arena, extra_ptr);
+
+ moz_dispose_arena(arena);
+
+ RESTORE_GDB_SLEEP_LOCAL();
+}
+
+TEST(Jemalloc, LeadingGuard)
+{
+ // Disable PHC allocations for this test, because even a single PHC
+ // allocation occurring can throw it off.
+ AutoDisablePHCOnCurrentThread disable;
+
+ jemalloc_stats_t stats;
+ jemalloc_stats(&stats);
+
+ // Avoid death tests adding some unnecessary (long) delays.
+ SAVE_GDB_SLEEP_LOCAL();
+
+ arena_id_t arena = moz_create_arena();
+ ASSERT_TRUE(arena != 0);
+
+ // Do a simple normal allocation, but force all the allocation space
+ // in the chunk to be used up. This allows us to check that we get
+ // the safe area right in the logic that follows (all memory will be
+ // committed and initialized), and it forces this pointer to the start
+ // of the zone to sit at the very start of the usable chunk area.
+ void* ptr = moz_arena_malloc(arena, stats.large_max);
+ ASSERT_TRUE(ptr != nullptr);
+ // If ptr is chunk-aligned, the above allocation went wrong.
+ void* chunk_start = (void*)ALIGNMENT_FLOOR((uintptr_t)ptr, stats.chunksize);
+ ASSERT_NE((uintptr_t)ptr, (uintptr_t)chunk_start);
+ // If ptr is 1 page after the chunk start (so right after the header),
+ // we must have missed adding the guard page.
+ ASSERT_NE((uintptr_t)ptr, (uintptr_t)chunk_start + stats.page_size);
+ // The actual start depends on the amount of metadata versus the page
+ // size, so we can't check equality without pulling in too many
+ // implementation details.
+
+ // Guard page should be right before data area
+ void* guard_page = (void*)(((uintptr_t)ptr) - sizeof(void*));
+ jemalloc_ptr_info_t info;
+ jemalloc_ptr_info(guard_page, &info);
+ ASSERT_TRUE(info.tag == TagUnknown);
+ ASSERT_DEATH_WRAP(*(char*)guard_page = 0, "");
+
+ moz_arena_free(arena, ptr);
+ moz_dispose_arena(arena);
+
+ RESTORE_GDB_SLEEP_LOCAL();
+}
+
+TEST(Jemalloc, DisposeArena)
+{
+ jemalloc_stats_t stats;
+ jemalloc_stats(&stats);
+
+ // Avoid death tests adding some unnecessary (long) delays.
+ SAVE_GDB_SLEEP_LOCAL();
+
+ arena_id_t arena = moz_create_arena();
+ void* ptr = moz_arena_malloc(arena, 42);
+ // Disposing of the arena when it's not empty is a MOZ_CRASH-worthy error.
+ ASSERT_DEATH_WRAP(moz_dispose_arena(arena), "");
+ moz_arena_free(arena, ptr);
+ moz_dispose_arena(arena);
+
+ arena = moz_create_arena();
+ ptr = moz_arena_malloc(arena, stats.page_size * 2);
+ // Disposing of the arena when it's not empty is a MOZ_CRASH-worthy error.
+ ASSERT_DEATH_WRAP(moz_dispose_arena(arena), "");
+ moz_arena_free(arena, ptr);
+ moz_dispose_arena(arena);
+
+ arena = moz_create_arena();
+ ptr = moz_arena_malloc(arena, stats.chunksize * 2);
+#ifdef MOZ_DEBUG
+ // On debug builds, we do the expensive check that arenas are empty.
+ ASSERT_DEATH_WRAP(moz_dispose_arena(arena), "");
+ moz_arena_free(arena, ptr);
+ moz_dispose_arena(arena);
+#else
+ // Currently, the allocator can't trivially check whether the arena is empty
+ // of huge allocations, so disposing of it works.
+ moz_dispose_arena(arena);
+ // But trying to free a pointer that belongs to it will MOZ_CRASH.
+ ASSERT_DEATH_WRAP(free(ptr), "");
+ // Likewise for realloc
+ ASSERT_DEATH_WRAP(ptr = realloc(ptr, stats.chunksize * 3), "");
+#endif
+
+ // Using the arena after it's been disposed of is MOZ_CRASH-worthy.
+ ASSERT_DEATH_WRAP(moz_arena_malloc(arena, 42), "");
+
+ RESTORE_GDB_SLEEP_LOCAL();
+}
diff --git a/memory/gtest/moz.build b/memory/gtest/moz.build
new file mode 100644
index 0000000000..f2a3e3f709
--- /dev/null
+++ b/memory/gtest/moz.build
@@ -0,0 +1,22 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# skip the test on windows10-aarch64 due to perma-crash - bug 1544961
+if CONFIG["OS_TARGET"] != "Android" and not (
+ CONFIG["OS_TARGET"] == "WINNT" and CONFIG["CPU_ARCH"] == "aarch64"
+):
+ UNIFIED_SOURCES += [
+ "TestJemalloc.cpp",
+ ]
+
+ if CONFIG["MOZ_PHC"]:
+ DEFINES["MOZ_PHC"] = True
+
+FINAL_LIBRARY = "xul-gtest"
+
+LOCAL_INCLUDES += [
+ "../build",
+]
diff --git a/memory/moz.build b/memory/moz.build
new file mode 100644
index 0000000000..e1da146a3c
--- /dev/null
+++ b/memory/moz.build
@@ -0,0 +1,31 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+with Files("**"):
+ BUG_COMPONENT = ("Core", "Memory Allocator")
+
+DIRS += [
+ "build",
+]
+
+if CONFIG["MOZ_BUILD_APP"] == "memory":
+ DIRS += [
+ "mozjemalloc_info",
+ ]
+else:
+ # For now, don't build mozalloc when building with --enable-project=memory
+ DIRS += [
+ "mozalloc",
+ ]
+
+if CONFIG["MOZ_WIDGET_TOOLKIT"]:
+ DIRS += ["volatile"]
+
+# NB: gtest dir is included in toolkit/toolkit.build due to its dependency
+# on libxul.
+
+if CONFIG["MOZ_REPLACE_MALLOC"]:
+ DIRS += ["replace"]
diff --git a/memory/moz.configure b/memory/moz.configure
new file mode 100644
index 0000000000..9745b253cd
--- /dev/null
+++ b/memory/moz.configure
@@ -0,0 +1,7 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+imply_option("--enable-jemalloc", True)
diff --git a/memory/mozalloc/cxxalloc.cpp b/memory/mozalloc/cxxalloc.cpp
new file mode 100644
index 0000000000..41f419fe2d
--- /dev/null
+++ b/memory/mozalloc/cxxalloc.cpp
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define MOZ_MEMORY_IMPL
+#include "mozmemory_wrap.h"
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+// See mozmemory_wrap.h for more details. Files that are part of libmozglue,
+// need to use _impl suffixes, which is becoming cumbersome. We'll have to use
+// something like a malloc.h wrapper and allow the use of the functions without
+// a _impl suffix. In the meanwhile, this is enough to get by for C++ code.
+#define MALLOC_DECL(name, return_type, ...) \
+ MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__);
+#include "malloc_decls.h"
+
+#include "mozilla/Attributes.h"
+
+extern "C" MFBT_API void* moz_xmalloc(size_t size) MOZ_INFALLIBLE_ALLOCATOR;
+
+namespace std {
+struct nothrow_t;
+}
+
+#define MOZALLOC_EXPORT_NEW MFBT_API
+
+#include "mozilla/cxxalloc.h"
diff --git a/memory/mozalloc/cxxalloc.h b/memory/mozalloc/cxxalloc.h
new file mode 100644
index 0000000000..c6fb4bb1dc
--- /dev/null
+++ b/memory/mozalloc/cxxalloc.h
@@ -0,0 +1,82 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_cxxalloc_h
+#define mozilla_cxxalloc_h
+
+/*
+ * We implement the default operators new/delete as part of
+ * libmozalloc, replacing their definitions in libstdc++. The
+ * operator new* definitions in libmozalloc will never return a NULL
+ * pointer.
+ *
+ * Each operator new immediately below returns a pointer to memory
+ * that can be delete'd by any of
+ *
+ * (1) the matching infallible operator delete immediately below
+ * (2) the matching system |operator delete(void*, std::nothrow)|
+ * (3) the matching system |operator delete(void*) noexcept(false)|
+ *
+ * NB: these are declared |noexcept(false)|, though they will never
+ * throw that exception. This declaration is consistent with the rule
+ * that |::operator new() noexcept(false)| will never return NULL.
+ *
+ * NB: mozilla::fallible can be used instead of std::nothrow.
+ */
+
+#ifndef MOZALLOC_EXPORT_NEW
+# define MOZALLOC_EXPORT_NEW MFBT_API
+#endif
+
+MOZALLOC_EXPORT_NEW void* operator new(size_t size) noexcept(false) {
+ return moz_xmalloc(size);
+}
+
+MOZALLOC_EXPORT_NEW void* operator new(size_t size,
+ const std::nothrow_t&) noexcept(true) {
+ return malloc_impl(size);
+}
+
+MOZALLOC_EXPORT_NEW void* operator new[](size_t size) noexcept(false) {
+ return moz_xmalloc(size);
+}
+
+MOZALLOC_EXPORT_NEW void* operator new[](size_t size,
+ const std::nothrow_t&) noexcept(true) {
+ return malloc_impl(size);
+}
+
+MOZALLOC_EXPORT_NEW void operator delete(void* ptr) noexcept(true) {
+ return free_impl(ptr);
+}
+
+MOZALLOC_EXPORT_NEW void operator delete(void* ptr,
+ const std::nothrow_t&) noexcept(true) {
+ return free_impl(ptr);
+}
+
+MOZALLOC_EXPORT_NEW void operator delete[](void* ptr) noexcept(true) {
+ return free_impl(ptr);
+}
+
+MOZALLOC_EXPORT_NEW void operator delete[](
+ void* ptr, const std::nothrow_t&) noexcept(true) {
+ return free_impl(ptr);
+}
+
+#if defined(XP_WIN)
+// We provide the global sized delete overloads unconditionally because the
+// MSVC runtime headers do, despite compiling with /Zc:sizedDealloc-
+MOZALLOC_EXPORT_NEW void operator delete(void* ptr,
+ size_t /*size*/) noexcept(true) {
+ return free_impl(ptr);
+}
+
+MOZALLOC_EXPORT_NEW void operator delete[](void* ptr,
+ size_t /*size*/) noexcept(true) {
+ return free_impl(ptr);
+}
+#endif
+
+#endif /* mozilla_cxxalloc_h */
diff --git a/memory/mozalloc/moz.build b/memory/mozalloc/moz.build
new file mode 100644
index 0000000000..c5cd784607
--- /dev/null
+++ b/memory/mozalloc/moz.build
@@ -0,0 +1,59 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+NoVisibilityFlags()
+
+EXPORTS.mozilla += [
+ "cxxalloc.h",
+ "mozalloc.h",
+ "mozalloc_abort.h",
+ "mozalloc_oom.h",
+]
+
+if CONFIG["WRAP_STL_INCLUDES"]:
+ if CONFIG["CC_TYPE"] in ("clang", "gcc"):
+ EXPORTS.mozilla += ["throw_gcc.h"]
+ elif CONFIG["CC_TYPE"] == "clang-cl":
+ DEFINES["_HAS_EXCEPTIONS"] = 0
+ SOURCES += [
+ "msvc_raise_wrappers.cpp",
+ ]
+
+if CONFIG["OS_TARGET"] == "WINNT":
+ # Don't build winheap.cpp when mozglue is a static library.
+ if CONFIG["MOZ_MEMORY"] or not CONFIG["JS_STANDALONE"]:
+ # Keep this file separate to avoid #include'ing windows.h everywhere.
+ SOURCES += [
+ "winheap.cpp",
+ ]
+
+UNIFIED_SOURCES += [
+ "mozalloc.cpp",
+ "mozalloc_abort.cpp",
+ "mozalloc_oom.cpp",
+]
+
+if CONFIG["MOZ_MEMORY"]:
+ # In MinGW, we don't want to actually export these functions out of the library
+ # as the functions in libc++ correctly forward to jemalloc and exporting them
+ # produces duplicate symbol errors.
+ if not (CONFIG["CC_TYPE"] == "clang" and CONFIG["OS_TARGET"] == "WINNT"):
+ SOURCES += [
+ "cxxalloc.cpp",
+ ]
+
+FINAL_LIBRARY = "mozglue"
+
+# The strndup declaration in string.h is in an ifdef __USE_GNU section
+DEFINES["_GNU_SOURCE"] = True
+
+DisableStlWrapping()
+
+LOCAL_INCLUDES += [
+ "!/xpcom",
+ "/memory/build",
+]
+
+DIST_INSTALL = True
diff --git a/memory/mozalloc/mozalloc.cpp b/memory/mozalloc/mozalloc.cpp
new file mode 100644
index 0000000000..aef8ab943a
--- /dev/null
+++ b/memory/mozalloc/mozalloc.cpp
@@ -0,0 +1,159 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stddef.h> // for size_t
+
+#if defined(MALLOC_H)
+# include MALLOC_H // for memalign, malloc_size, malloc_us
+#endif // if defined(MALLOC_H)
+
+#if !defined(MOZ_MEMORY)
+// When jemalloc is disabled, or when building the static runtime variant,
+// we need not to use the suffixes.
+
+# include <stdlib.h> // for malloc, free
+# if defined(XP_UNIX)
+# include <unistd.h>
+# endif // if defined(XP_UNIX)
+
+# define malloc_impl malloc
+# define calloc_impl calloc
+# define realloc_impl realloc
+# define free_impl free
+# define memalign_impl memalign
+# define malloc_usable_size_impl malloc_usable_size
+# define strdup_impl strdup
+# define strndup_impl strndup
+
+#endif
+
+#include <errno.h>
+#include <new> // for std::bad_alloc
+#include <cstring>
+
+#include <sys/types.h>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/Likely.h"
+#include "mozilla/mozalloc.h"
+#include "mozilla/mozalloc_oom.h" // for mozalloc_handle_oom
+
+#if defined(MOZ_MEMORY)
+MOZ_MEMORY_API char* strdup_impl(const char*);
+MOZ_MEMORY_API char* strndup_impl(const char*, size_t);
+#endif
+
+void* moz_xmalloc(size_t size) {
+ void* ptr = malloc_impl(size);
+ if (MOZ_UNLIKELY(!ptr && size)) {
+ mozalloc_handle_oom(size);
+ return moz_xmalloc(size);
+ }
+ return ptr;
+}
+
+void* moz_xcalloc(size_t nmemb, size_t size) {
+ void* ptr = calloc_impl(nmemb, size);
+ if (MOZ_UNLIKELY(!ptr && nmemb && size)) {
+ mozilla::CheckedInt<size_t> totalSize =
+ mozilla::CheckedInt<size_t>(nmemb) * size;
+ mozalloc_handle_oom(totalSize.isValid() ? totalSize.value() : SIZE_MAX);
+ return moz_xcalloc(nmemb, size);
+ }
+ return ptr;
+}
+
+void* moz_xrealloc(void* ptr, size_t size) {
+ void* newptr = realloc_impl(ptr, size);
+ if (MOZ_UNLIKELY(!newptr && size)) {
+ mozalloc_handle_oom(size);
+ return moz_xrealloc(ptr, size);
+ }
+ return newptr;
+}
+
+char* moz_xstrdup(const char* str) {
+ char* dup = strdup_impl(str);
+ if (MOZ_UNLIKELY(!dup)) {
+ mozalloc_handle_oom(0);
+ return moz_xstrdup(str);
+ }
+ return dup;
+}
+
+#if defined(HAVE_STRNDUP)
+char* moz_xstrndup(const char* str, size_t strsize) {
+ char* dup = strndup_impl(str, strsize);
+ if (MOZ_UNLIKELY(!dup)) {
+ mozalloc_handle_oom(strsize);
+ return moz_xstrndup(str, strsize);
+ }
+ return dup;
+}
+#endif // if defined(HAVE_STRNDUP)
+
+void* moz_xmemdup(const void* ptr, size_t size) {
+ void* newPtr = moz_xmalloc(size);
+ memcpy(newPtr, ptr, size);
+ return newPtr;
+}
+
+#ifndef __wasm__
+# ifndef HAVE_MEMALIGN
+// We always have a definition of memalign, but system headers don't
+// necessarily come with a declaration.
+extern "C" void* memalign(size_t, size_t);
+# endif
+
+void* moz_xmemalign(size_t boundary, size_t size) {
+ void* ptr = memalign_impl(boundary, size);
+ if (MOZ_UNLIKELY(!ptr && EINVAL != errno)) {
+ mozalloc_handle_oom(size);
+ return moz_xmemalign(boundary, size);
+ }
+ // non-NULL ptr or errno == EINVAL
+ return ptr;
+}
+#endif
+
+size_t moz_malloc_usable_size(void* ptr) {
+ if (!ptr) return 0;
+
+#if defined(XP_DARWIN)
+ return malloc_size(ptr);
+#elif defined(HAVE_MALLOC_USABLE_SIZE) || defined(MOZ_MEMORY)
+ return malloc_usable_size_impl(ptr);
+#elif defined(XP_WIN)
+ return _msize(ptr);
+#else
+ return 0;
+#endif
+}
+
+size_t moz_malloc_size_of(const void* ptr) {
+ return moz_malloc_usable_size((void*)ptr);
+}
+
+#if defined(MOZ_MEMORY)
+# include "mozjemalloc_types.h"
+// mozmemory.h declares jemalloc_ptr_info(), but including that header in this
+// file is complicated. So we just redeclare it here instead, and include
+// mozjemalloc_types.h for jemalloc_ptr_info_t.
+MOZ_JEMALLOC_API void jemalloc_ptr_info(const void* ptr,
+ jemalloc_ptr_info_t* info);
+#endif
+
+size_t moz_malloc_enclosing_size_of(const void* ptr) {
+#if defined(MOZ_MEMORY)
+ jemalloc_ptr_info_t info;
+ jemalloc_ptr_info(ptr, &info);
+ return jemalloc_ptr_is_live(&info) ? info.size : 0;
+#else
+ return 0;
+#endif
+}
diff --git a/memory/mozalloc/mozalloc.h b/memory/mozalloc/mozalloc.h
new file mode 100644
index 0000000000..1ebbb83237
--- /dev/null
+++ b/memory/mozalloc/mozalloc.h
@@ -0,0 +1,198 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_mozalloc_h
+#define mozilla_mozalloc_h
+
+/*
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=427099
+ */
+
+#if defined(__cplusplus)
+# include <new>
+// Since libstdc++ 6, including the C headers (e.g. stdlib.h) instead of the
+// corresponding C++ header (e.g. cstdlib) can cause confusion in C++ code
+// using things defined there. Specifically, with stdlib.h, the use of abs()
+// in gfx/graphite2/src/inc/UtfCodec.h somehow ends up picking the wrong abs()
+# include <cstdlib>
+#else
+# include <stdlib.h>
+#endif
+
+#if defined(MOZ_MEMORY) && defined(IMPL_MFBT)
+# define MOZ_MEMORY_IMPL
+# include "mozmemory_wrap.h"
+# define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+// See mozmemory_wrap.h for more details. Files that are part of libmozglue,
+// need to use _impl suffixes, which is becoming cumbersome. We'll have to use
+// something like a malloc.h wrapper and allow the use of the functions without
+// a _impl suffix. In the meanwhile, this is enough to get by for C++ code.
+# define NOTHROW_MALLOC_DECL(name, return_type, ...) \
+ MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__) noexcept(true);
+# define MALLOC_DECL(name, return_type, ...) \
+ MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__);
+# include "malloc_decls.h"
+#endif
+
+#if defined(__cplusplus)
+# include "mozilla/fallible.h"
+# include "mozilla/mozalloc_abort.h"
+# include "mozilla/TemplateLib.h"
+#endif
+#include "mozilla/Attributes.h"
+#include "mozilla/Types.h"
+
+MOZ_BEGIN_EXTERN_C
+
+/*
+ * We need to use malloc_impl and free_impl in this file when they are
+ * defined, because of how mozglue.dll is linked on Windows, where using
+ * malloc/free would end up using the symbols from the MSVCRT instead of
+ * ours.
+ */
+#ifndef free_impl
+# define free_impl free
+# define free_impl_
+#endif
+#ifndef malloc_impl
+# define malloc_impl malloc
+# define malloc_impl_
+#endif
+
+/*
+ * Each declaration below is analogous to a "standard" allocation
+ * function, except that the out-of-memory handling is made explicit.
+ * The |moz_x| versions will never return a NULL pointer; if memory
+ * is exhausted, they abort. The |moz_| versions may return NULL
+ * pointers if memory is exhausted: their return value must be checked.
+ *
+ * All these allocation functions are *guaranteed* to return a pointer
+ * to memory allocated in such a way that that memory can be freed by
+ * passing that pointer to |free()|.
+ */
+
+MFBT_API void* moz_xmalloc(size_t size) MOZ_INFALLIBLE_ALLOCATOR;
+
+MFBT_API void* moz_xcalloc(size_t nmemb, size_t size) MOZ_INFALLIBLE_ALLOCATOR;
+
+MFBT_API void* moz_xrealloc(void* ptr, size_t size) MOZ_INFALLIBLE_ALLOCATOR;
+
+MFBT_API char* moz_xstrdup(const char* str) MOZ_INFALLIBLE_ALLOCATOR;
+
+#if defined(HAVE_STRNDUP)
+MFBT_API char* moz_xstrndup(const char* str,
+ size_t strsize) MOZ_INFALLIBLE_ALLOCATOR;
+#endif /* if defined(HAVE_STRNDUP) */
+
+MFBT_API void* moz_xmemdup(const void* ptr,
+ size_t size) MOZ_INFALLIBLE_ALLOCATOR;
+
+MFBT_API void* moz_xmemalign(size_t boundary,
+ size_t size) MOZ_INFALLIBLE_ALLOCATOR;
+
+MFBT_API size_t moz_malloc_usable_size(void* ptr);
+
+MFBT_API size_t moz_malloc_size_of(const void* ptr);
+
+/*
+ * Like moz_malloc_size_of(), but works reliably with interior pointers, i.e.
+ * pointers into the middle of a live allocation.
+ */
+MFBT_API size_t moz_malloc_enclosing_size_of(const void* ptr);
+
+MOZ_END_EXTERN_C
+
+#ifdef __cplusplus
+
+/* NB: This is defined with MFBT_API just to silence vacuous warnings
+ * about symbol visibility on OS X/gcc.
+ * These symbols are force-inline mainly for performance reasons, and
+ * not exported. While the standard doesn't allow that, we are in a
+ * controlled environment where the issues the standard tries to
+ * prevent don't apply, and we can't end up in situations where
+ * operator new and operator delete are inconsistent. */
+# ifdef __clang__
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Winline-new-delete"
+# endif
+
+# if defined(XP_MACOSX)
+# define MOZALLOC_EXPORT_NEW MFBT_API MOZ_ALWAYS_INLINE_EVEN_DEBUG
+# else
+# define MOZALLOC_EXPORT_NEW MOZ_ALWAYS_INLINE_EVEN_DEBUG
+# endif
+
+# include "mozilla/cxxalloc.h"
+# ifdef __clang__
+# pragma clang diagnostic pop
+# endif
+
+/*
+ * This policy is identical to MallocAllocPolicy, except it uses
+ * moz_xmalloc/moz_xcalloc/moz_xrealloc instead of
+ * malloc/calloc/realloc.
+ */
+class InfallibleAllocPolicy {
+ public:
+ template <typename T>
+ T* maybe_pod_malloc(size_t aNumElems) {
+ return pod_malloc<T>(aNumElems);
+ }
+
+ template <typename T>
+ T* maybe_pod_calloc(size_t aNumElems) {
+ return pod_calloc<T>(aNumElems);
+ }
+
+ template <typename T>
+ T* maybe_pod_realloc(T* aPtr, size_t aOldSize, size_t aNewSize) {
+ return pod_realloc<T>(aPtr, aOldSize, aNewSize);
+ }
+
+ template <typename T>
+ T* pod_malloc(size_t aNumElems) {
+ if (aNumElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value) {
+ reportAllocOverflow();
+ }
+ return static_cast<T*>(moz_xmalloc(aNumElems * sizeof(T)));
+ }
+
+ template <typename T>
+ T* pod_calloc(size_t aNumElems) {
+ return static_cast<T*>(moz_xcalloc(aNumElems, sizeof(T)));
+ }
+
+ template <typename T>
+ T* pod_realloc(T* aPtr, size_t aOldSize, size_t aNewSize) {
+ if (aNewSize & mozilla::tl::MulOverflowMask<sizeof(T)>::value) {
+ reportAllocOverflow();
+ }
+ return static_cast<T*>(moz_xrealloc(aPtr, aNewSize * sizeof(T)));
+ }
+
+ template <typename T>
+ void free_(T* aPtr, size_t aNumElems = 0) {
+ free_impl(aPtr);
+ }
+
+ void reportAllocOverflow() const { mozalloc_abort("alloc overflow"); }
+
+ bool checkSimulatedOOM() const { return true; }
+};
+
+#endif /* ifdef __cplusplus */
+
+#ifdef malloc_impl_
+# undef malloc_impl_
+# undef malloc_impl
+#endif
+#ifdef free_impl_
+# undef free_impl_
+# undef free_impl
+#endif
+
+#endif /* ifndef mozilla_mozalloc_h */
diff --git a/memory/mozalloc/mozalloc_abort.cpp b/memory/mozalloc/mozalloc_abort.cpp
new file mode 100644
index 0000000000..3cfc92533e
--- /dev/null
+++ b/memory/mozalloc/mozalloc_abort.cpp
@@ -0,0 +1,96 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/mozalloc_abort.h"
+
+#ifdef ANDROID
+# include <android/log.h>
+#endif
+#ifdef MOZ_WIDGET_ANDROID
+# include "APKOpen.h"
+# include "dlfcn.h"
+#endif
+#include <stdio.h>
+#include <string.h>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Sprintf.h"
+
+void mozalloc_abort(const char* const msg) {
+#ifndef ANDROID
+ fputs(msg, stderr);
+ fputs("\n", stderr);
+#else
+ __android_log_print(ANDROID_LOG_ERROR, "Gecko", "mozalloc_abort: %s", msg);
+#endif
+
+#ifdef MOZ_WIDGET_ANDROID
+ abortThroughJava(msg);
+#endif
+
+ MOZ_CRASH_UNSAFE(msg);
+}
+
+#ifdef MOZ_WIDGET_ANDROID
+template <size_t N>
+void fillAbortMessage(char (&msg)[N], uintptr_t retAddress) {
+ /*
+ * On Android, we often don't have reliable backtrace when crashing inside
+ * abort(). Therefore, we try to find out who is calling abort() and add
+ * that to the message.
+ */
+ Dl_info info = {};
+ dladdr(reinterpret_cast<void*>(retAddress), &info);
+
+ const char* const module = info.dli_fname ? info.dli_fname : "";
+ const char* const base_module = strrchr(module, '/');
+ const void* const module_offset =
+ reinterpret_cast<void*>(retAddress - uintptr_t(info.dli_fbase));
+ const char* const sym = info.dli_sname ? info.dli_sname : "";
+
+ SprintfLiteral(msg, "abort() called from %s:%p (%s)",
+ base_module ? base_module + 1 : module, module_offset, sym);
+}
+#endif
+
+#if defined(XP_UNIX) && !defined(MOZ_ASAN) && !defined(MOZ_TSAN) && \
+ !defined(LIBFUZZER)
+// Define abort() here, so that it is used instead of the system abort(). This
+// lets us control the behavior when aborting, in order to get better results
+// on *NIX platforms. See mozalloc_abort for details.
+//
+// For AddressSanitizer, we must not redefine system abort because the ASan
+// option "abort_on_error=1" calls abort() and therefore causes the following
+// call chain with our redefined abort:
+//
+// ASan -> abort() -> moz_abort() -> MOZ_CRASH() -> Segmentation fault
+//
+// That segmentation fault will be interpreted as another bug by ASan and as a
+// result, ASan will just exit(1) instead of aborting.
+//
+// The same applies to ThreadSanitizer when run with "halt_on_error=1" in
+// combination with "abort_on_error=1".
+//
+// When building with libFuzzer, it pulls in the UndefinedBehaviorSanitizer
+// runtime which also requires the same workaround as with ASan or TSan.
+extern "C" void abort(void) {
+# ifdef MOZ_WIDGET_ANDROID
+ char msg[64] = {};
+ fillAbortMessage(msg, uintptr_t(__builtin_return_address(0)));
+# else
+ const char* const msg = "Redirecting call to abort() to mozalloc_abort\n";
+# endif
+
+ mozalloc_abort(msg);
+
+ // We won't reach here because mozalloc_abort() is MOZ_NORETURN. But that
+ // annotation isn't used on ARM (see mozalloc_abort.h for why) so we add a
+ // unreachable marker here to avoid a "'noreturn' function does return"
+ // warning.
+ MOZ_ASSUME_UNREACHABLE_MARKER();
+}
+#endif
diff --git a/memory/mozalloc/mozalloc_abort.h b/memory/mozalloc/mozalloc_abort.h
new file mode 100644
index 0000000000..b9ff92a18e
--- /dev/null
+++ b/memory/mozalloc/mozalloc_abort.h
@@ -0,0 +1,28 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_mozalloc_abort_h
+#define mozilla_mozalloc_abort_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Types.h"
+
+/**
+ * Terminate this process in such a way that breakpad is triggered, if
+ * at all possible.
+ *
+ * Note: MOZ_NORETURN seems to break crash stacks on ARM, so we don't
+ * use that annotation there.
+ */
+extern "C" MFBT_API
+#if !defined(__arm__)
+ MOZ_NORETURN
+#endif
+ void
+ mozalloc_abort(const char* const msg);
+
+#endif /* ifndef mozilla_mozalloc_abort_h */
diff --git a/memory/mozalloc/mozalloc_oom.cpp b/memory/mozalloc/mozalloc_oom.cpp
new file mode 100644
index 0000000000..efe5dab4a2
--- /dev/null
+++ b/memory/mozalloc/mozalloc_oom.cpp
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/mozalloc_abort.h"
+#include "mozilla/mozalloc_oom.h"
+#include "mozilla/Assertions.h"
+
+#define OOM_MSG_LEADER "out of memory: 0x"
+#define OOM_MSG_DIGITS "0000000000000000" // large enough for 2^64
+#define OOM_MSG_TRAILER " bytes requested"
+#define OOM_MSG_FIRST_DIGIT_OFFSET sizeof(OOM_MSG_LEADER) - 1
+#define OOM_MSG_LAST_DIGIT_OFFSET \
+ sizeof(OOM_MSG_LEADER) + sizeof(OOM_MSG_DIGITS) - 3
+
+MFBT_DATA size_t gOOMAllocationSize = 0;
+
+static const char* hex = "0123456789ABCDEF";
+
+void mozalloc_handle_oom(size_t size) {
+ char oomMsg[] = OOM_MSG_LEADER OOM_MSG_DIGITS OOM_MSG_TRAILER;
+ size_t i;
+
+ // NB: this is handle_oom() stage 1, which simply aborts on OOM.
+ // we might proceed to a stage 2 in which an attempt is made to
+ // reclaim memory
+ // Warning: when stage 2 is done by, for example, notifying
+ // "memory-pressure" synchronously, please audit all
+ // nsExpirationTrackers and ensure that the actions they take
+ // on memory-pressure notifications (via NotifyExpired) are safe.
+ // Note that Document::SelectorCache::NotifyExpired is _known_
+ // to not be safe: it will delete the selector it's caching,
+ // which might be in use at the time under querySelector or
+ // querySelectorAll.
+
+ gOOMAllocationSize = size;
+
+ static_assert(OOM_MSG_FIRST_DIGIT_OFFSET > 0,
+ "Loop below will never terminate (i can't go below 0)");
+
+ // Insert size into the diagnostic message using only primitive operations
+ for (i = OOM_MSG_LAST_DIGIT_OFFSET; size && i >= OOM_MSG_FIRST_DIGIT_OFFSET;
+ i--) {
+ oomMsg[i] = hex[size % 16];
+ size /= 16;
+ }
+
+ mozalloc_abort(oomMsg);
+}
diff --git a/memory/mozalloc/mozalloc_oom.h b/memory/mozalloc/mozalloc_oom.h
new file mode 100644
index 0000000000..be504bac85
--- /dev/null
+++ b/memory/mozalloc/mozalloc_oom.h
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_mozalloc_oom_h
+#define mozilla_mozalloc_oom_h
+
+#include "mozalloc.h"
+
+/**
+ * Called when memory is critically low. Returns iff it was able to
+ * remedy the critical memory situation; if not, it will abort().
+ */
+#ifdef __wasm__
+__attribute__((import_module("env")))
+__attribute__((import_name("mozalloc_handle_oom")))
+#endif
+MFBT_API void
+mozalloc_handle_oom(size_t requestedSize);
+
+extern MFBT_DATA size_t gOOMAllocationSize;
+
+/* TODO: functions to query system memory usage and register
+ * critical-memory handlers. */
+
+#endif /* ifndef mozilla_mozalloc_oom_h */
diff --git a/memory/mozalloc/msvc_raise_wrappers.cpp b/memory/mozalloc/msvc_raise_wrappers.cpp
new file mode 100644
index 0000000000..6eb8bdbe31
--- /dev/null
+++ b/memory/mozalloc/msvc_raise_wrappers.cpp
@@ -0,0 +1,17 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <exception>
+#include "mozalloc_abort.h"
+
+static void __cdecl RaiseHandler(const std::exception& e) {
+ mozalloc_abort(e.what());
+}
+
+static struct StaticScopeStruct final {
+ StaticScopeStruct() { std::exception::_Set_raise_handler(RaiseHandler); }
+} StaticScopeInvoke;
diff --git a/memory/mozalloc/throw_gcc.h b/memory/mozalloc/throw_gcc.h
new file mode 100644
index 0000000000..6a452ca5fc
--- /dev/null
+++ b/memory/mozalloc/throw_gcc.h
@@ -0,0 +1,152 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_throw_gcc_h
+#define mozilla_throw_gcc_h
+
+#if !defined(_LIBCPP_VERSION) || _LIBCPP_VERSION < 14000
+
+# include "mozilla/Attributes.h"
+
+# include <stdio.h> // snprintf
+# include <string.h> // strerror
+
+// For gcc, we define these inline to abort so that we're absolutely
+// certain that (i) no exceptions are thrown from Gecko; (ii) these
+// errors are always terminal and caught by breakpad.
+
+# include "mozilla/mozalloc_abort.h"
+
+// libc++ 4.0.0 and higher use C++11 [[noreturn]] attributes for the functions
+// below, and since clang does not allow mixing __attribute__((noreturn)) and
+// [[noreturn]], we have to explicitly use the latter here. See bug 1329520.
+# if defined(__clang__)
+# if __has_feature(cxx_attributes) && defined(_LIBCPP_VERSION) && \
+ _LIBCPP_VERSION >= 4000
+# define MOZ_THROW_NORETURN [[noreturn]]
+# endif
+# endif
+# ifndef MOZ_THROW_NORETURN
+# define MOZ_THROW_NORETURN MOZ_NORETURN
+# endif
+
+// MinGW doesn't appropriately inline these functions in debug builds,
+// so we need to do some extra coercion for it to do so. Bug 1332747
+# ifdef __MINGW32__
+# define MOZ_THROW_INLINE MOZ_ALWAYS_INLINE_EVEN_DEBUG
+# define MOZ_THROW_EXPORT
+# else
+# define MOZ_THROW_INLINE MOZ_ALWAYS_INLINE
+# define MOZ_THROW_EXPORT MOZ_EXPORT
+# endif
+
+namespace std {
+
+// NB: user code is not supposed to touch the std:: namespace. We're
+// doing this after careful review because we want to define our own
+// exception throwing semantics. Don't try this at home!
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_bad_exception(
+ void) {
+ mozalloc_abort("fatal: STL threw bad_exception");
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_bad_alloc(
+ void) {
+ mozalloc_abort("fatal: STL threw bad_alloc");
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_bad_cast(
+ void) {
+ mozalloc_abort("fatal: STL threw bad_cast");
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_bad_typeid(
+ void) {
+ mozalloc_abort("fatal: STL threw bad_typeid");
+}
+
+// used by <functional>
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void
+__throw_bad_function_call(void) {
+ mozalloc_abort("fatal: STL threw bad_function_call");
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_logic_error(
+ const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_domain_error(
+ const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void
+__throw_invalid_argument(const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_length_error(
+ const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_out_of_range(
+ const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_runtime_error(
+ const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_range_error(
+ const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void
+__throw_overflow_error(const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void
+__throw_underflow_error(const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_ios_failure(
+ const char* msg) {
+ mozalloc_abort(msg);
+}
+
+MOZ_THROW_NORETURN MOZ_THROW_EXPORT MOZ_THROW_INLINE void __throw_system_error(
+ int err) {
+ char error[128];
+ snprintf(error, sizeof(error) - 1, "fatal: STL threw system_error: %s (%d)",
+ strerror(err), err);
+ mozalloc_abort(error);
+}
+
+MOZ_THROW_NORETURN MOZ_EXPORT MOZ_ALWAYS_INLINE void __throw_regex_error(
+ int err) {
+ char error[128];
+ snprintf(error, sizeof(error) - 1, "fatal: STL threw regex_error: %s (%d)",
+ strerror(err), err);
+ mozalloc_abort(error);
+}
+
+} // namespace std
+
+# undef MOZ_THROW_NORETURN
+# undef MOZ_THROW_INLINE
+
+#endif
+
+#endif // mozilla_throw_gcc_h
diff --git a/memory/mozalloc/winheap.cpp b/memory/mozalloc/winheap.cpp
new file mode 100644
index 0000000000..1d2e1e5599
--- /dev/null
+++ b/memory/mozalloc/winheap.cpp
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=4 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/mozalloc.h"
+#include <windows.h>
+
+#if !defined(MOZ_MEMORY)
+# include <malloc.h>
+# define malloc_impl malloc
+# define calloc_impl calloc
+# define realloc_impl realloc
+# define free_impl free
+#endif
+
+// Warning: C4273: 'HeapAlloc': inconsistent dll linkage
+// The Windows headers define HeapAlloc as dllimport, but we define it as
+// dllexport, which is a voluntary inconsistency.
+#pragma warning(disable : 4273)
+
+MFBT_API
+LPVOID WINAPI HeapAlloc(_In_ HANDLE hHeap, _In_ DWORD dwFlags,
+ _In_ SIZE_T dwBytes) {
+ if (dwFlags & HEAP_ZERO_MEMORY) {
+ return calloc_impl(1, dwBytes);
+ }
+ return malloc_impl(dwBytes);
+}
+
+MFBT_API
+LPVOID WINAPI HeapReAlloc(_In_ HANDLE hHeap, _In_ DWORD dwFlags,
+ _In_ LPVOID lpMem, _In_ SIZE_T dwBytes) {
+ // The HeapReAlloc contract is that failures preserve the existing
+ // allocation. We can't try to realloc in-place without possibly
+ // freeing the original allocation, breaking the contract.
+ // We also can't guarantee we zero all the memory from the end of
+ // the original allocation to the end of the new one because of the
+ // difference between the originally requested size and what
+ // malloc_usable_size would return us.
+ // So for both cases, just tell the caller we can't do what they
+ // requested.
+ if (dwFlags & (HEAP_REALLOC_IN_PLACE_ONLY | HEAP_ZERO_MEMORY)) {
+ return NULL;
+ }
+ return realloc_impl(lpMem, dwBytes);
+}
+
+MFBT_API
+BOOL WINAPI HeapFree(_In_ HANDLE hHeap, _In_ DWORD dwFlags, _In_ LPVOID lpMem) {
+ free_impl(lpMem);
+ return true;
+}
diff --git a/memory/mozjemalloc_info/MozjemallocInfo.cpp b/memory/mozjemalloc_info/MozjemallocInfo.cpp
new file mode 100644
index 0000000000..0795be8047
--- /dev/null
+++ b/memory/mozjemalloc_info/MozjemallocInfo.cpp
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mozmemory.h"
+
+/*
+ * Print the configured size classes which we can then use to update
+ * documentation.
+ */
+int main() {
+ jemalloc_stats_t stats;
+
+ const size_t num_bins = jemalloc_stats_num_bins();
+ const size_t MAX_NUM_BINS = 100;
+ if (num_bins > MAX_NUM_BINS) {
+ fprintf(stderr, "Exceeded maximum number of jemalloc stats bins");
+ return 1;
+ }
+ jemalloc_bin_stats_t bin_stats[MAX_NUM_BINS] = {{0}};
+ jemalloc_stats(&stats, bin_stats);
+
+ printf("Page size: %5zu\n", stats.page_size);
+ printf("Chunk size: %5zuKiB\n", stats.chunksize / 1024);
+
+ printf("Quantum: %5zu\n", stats.quantum);
+ printf("Quantum max: %5zu\n", stats.quantum_max);
+ printf("Sub-page max: %5zu\n", stats.page_size / 2);
+ printf("Large max: %5zuKiB\n", stats.large_max / 1024);
+
+ printf("\nBin stats:\n");
+ for (unsigned i = 0; i < num_bins; i++) {
+ auto& bin = bin_stats[i];
+ if (bin.size) {
+ printf(" Bin %5zu has runs of %3zuKiB\n", bin.size,
+ bin.bytes_per_run / 1024);
+ }
+ }
+
+ return EXIT_SUCCESS;
+}
diff --git a/memory/mozjemalloc_info/moz.build b/memory/mozjemalloc_info/moz.build
new file mode 100644
index 0000000000..76dd3c5001
--- /dev/null
+++ b/memory/mozjemalloc_info/moz.build
@@ -0,0 +1,39 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+Program("mozjemalloc-info")
+
+SOURCES += [
+ "/mfbt/Assertions.cpp",
+ "/mfbt/RandomNum.cpp",
+ "/mozglue/misc/StackWalk.cpp",
+ "MozjemallocInfo.cpp",
+]
+
+# Link replace-malloc and the default allocator.
+USE_LIBS += [
+ "memory",
+]
+
+# The memory library defines this, so it's needed here too.
+DEFINES["IMPL_MFBT"] = True
+
+if CONFIG["MOZ_NEEDS_LIBATOMIC"]:
+ OS_LIBS += ["atomic"]
+
+UNIFIED_SOURCES += [
+ "/mfbt/double-conversion/double-conversion/bignum-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/bignum.cc",
+ "/mfbt/double-conversion/double-conversion/cached-powers.cc",
+ "/mfbt/double-conversion/double-conversion/double-to-string.cc",
+ "/mfbt/double-conversion/double-conversion/fast-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/fixed-dtoa.cc",
+ "/mozglue/misc/Printf.cpp",
+]
+
+DisableStlWrapping()
+
+include("/mozglue/build/replace_malloc.mozbuild")
diff --git a/memory/replace/dmd/DMD.cpp b/memory/replace/dmd/DMD.cpp
new file mode 100644
index 0000000000..2e12deda24
--- /dev/null
+++ b/memory/replace/dmd/DMD.cpp
@@ -0,0 +1,1888 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(MOZ_PROFILING)
+# error "DMD requires MOZ_PROFILING"
+#endif
+
+#ifdef XP_WIN
+# include <windows.h>
+# include <process.h>
+#else
+# include <pthread.h>
+# include <sys/types.h>
+# include <unistd.h>
+#endif
+
+#ifdef ANDROID
+# include <android/log.h>
+#endif
+
+#include "nscore.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/FastBernoulliTrial.h"
+#include "mozilla/HashFunctions.h"
+#include "mozilla/HashTable.h"
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/JSONWriter.h"
+#include "mozilla/Likely.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/PodOperations.h"
+#include "mozilla/StackWalk.h"
+#include "mozilla/ThreadLocal.h"
+
+// CodeAddressService is defined entirely in the header, so this does not make
+// DMD depend on XPCOM's object file.
+#include "CodeAddressService.h"
+
+// replace_malloc.h needs to be included before replace_malloc_bridge.h,
+// which DMD.h includes, so DMD.h needs to be included after replace_malloc.h.
+#include "replace_malloc.h"
+#include "DMD.h"
+
+namespace mozilla {
+namespace dmd {
+
+class DMDBridge : public ReplaceMallocBridge {
+ virtual DMDFuncs* GetDMDFuncs() override;
+};
+
+static DMDBridge* gDMDBridge;
+static DMDFuncs gDMDFuncs;
+
+DMDFuncs* DMDBridge::GetDMDFuncs() { return &gDMDFuncs; }
+
+MOZ_FORMAT_PRINTF(1, 2)
+inline void StatusMsg(const char* aFmt, ...) {
+ va_list ap;
+ va_start(ap, aFmt);
+ gDMDFuncs.StatusMsg(aFmt, ap);
+ va_end(ap);
+}
+
+//---------------------------------------------------------------------------
+// Utilities
+//---------------------------------------------------------------------------
+
+#ifndef DISALLOW_COPY_AND_ASSIGN
+# define DISALLOW_COPY_AND_ASSIGN(T) \
+ T(const T&); \
+ void operator=(const T&)
+#endif
+
+static malloc_table_t gMallocTable;
+
+// This provides infallible allocations (they abort on OOM). We use it for all
+// of DMD's own allocations, which fall into the following three cases.
+//
+// - Direct allocations (the easy case).
+//
+// - Indirect allocations in mozilla::{Vector,HashSet,HashMap} -- this class
+// serves as their AllocPolicy.
+//
+// - Other indirect allocations (e.g. MozStackWalk) -- see the comments on
+// Thread::mBlockIntercepts and in replace_malloc for how these work.
+//
+// It would be nice if we could use the InfallibleAllocPolicy from mozalloc,
+// but DMD cannot use mozalloc.
+//
+class InfallibleAllocPolicy {
+ static void ExitOnFailure(const void* aP);
+
+ public:
+ template <typename T>
+ static T* maybe_pod_malloc(size_t aNumElems) {
+ if (aNumElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value)
+ return nullptr;
+ return (T*)gMallocTable.malloc(aNumElems * sizeof(T));
+ }
+
+ template <typename T>
+ static T* maybe_pod_calloc(size_t aNumElems) {
+ return (T*)gMallocTable.calloc(aNumElems, sizeof(T));
+ }
+
+ template <typename T>
+ static T* maybe_pod_realloc(T* aPtr, size_t aOldSize, size_t aNewSize) {
+ if (aNewSize & mozilla::tl::MulOverflowMask<sizeof(T)>::value)
+ return nullptr;
+ return (T*)gMallocTable.realloc(aPtr, aNewSize * sizeof(T));
+ }
+
+ static void* malloc_(size_t aSize) {
+ void* p = gMallocTable.malloc(aSize);
+ ExitOnFailure(p);
+ return p;
+ }
+
+ template <typename T>
+ static T* pod_malloc(size_t aNumElems) {
+ T* p = maybe_pod_malloc<T>(aNumElems);
+ ExitOnFailure(p);
+ return p;
+ }
+
+ static void* calloc_(size_t aCount, size_t aSize) {
+ void* p = gMallocTable.calloc(aCount, aSize);
+ ExitOnFailure(p);
+ return p;
+ }
+
+ template <typename T>
+ static T* pod_calloc(size_t aNumElems) {
+ T* p = maybe_pod_calloc<T>(aNumElems);
+ ExitOnFailure(p);
+ return p;
+ }
+
+ static void* realloc_(void* aPtr, size_t aNewSize) {
+ void* p = gMallocTable.realloc(aPtr, aNewSize);
+ ExitOnFailure(p);
+ return p;
+ }
+
+ template <typename T>
+ static T* pod_realloc(T* aPtr, size_t aOldSize, size_t aNewSize) {
+ T* p = maybe_pod_realloc(aPtr, aOldSize, aNewSize);
+ ExitOnFailure(p);
+ return p;
+ }
+
+ static void* memalign_(size_t aAlignment, size_t aSize) {
+ void* p = gMallocTable.memalign(aAlignment, aSize);
+ ExitOnFailure(p);
+ return p;
+ }
+
+ template <typename T>
+ static void free_(T* aPtr, size_t aSize = 0) {
+ gMallocTable.free(aPtr);
+ }
+
+ static char* strdup_(const char* aStr) {
+ char* s = (char*)InfallibleAllocPolicy::malloc_(strlen(aStr) + 1);
+ strcpy(s, aStr);
+ return s;
+ }
+
+ template <class T>
+ static T* new_() {
+ void* mem = malloc_(sizeof(T));
+ return new (mem) T;
+ }
+
+ template <class T, typename P1>
+ static T* new_(const P1& aP1) {
+ void* mem = malloc_(sizeof(T));
+ return new (mem) T(aP1);
+ }
+
+ template <class T>
+ static void delete_(T* aPtr) {
+ if (aPtr) {
+ aPtr->~T();
+ InfallibleAllocPolicy::free_(aPtr);
+ }
+ }
+
+ static void reportAllocOverflow() { ExitOnFailure(nullptr); }
+ bool checkSimulatedOOM() const { return true; }
+};
+
+// This is only needed because of the |const void*| vs |void*| arg mismatch.
+static size_t MallocSizeOf(const void* aPtr) {
+ return gMallocTable.malloc_usable_size(const_cast<void*>(aPtr));
+}
+
+void DMDFuncs::StatusMsg(const char* aFmt, va_list aAp) {
+#ifdef ANDROID
+ __android_log_vprint(ANDROID_LOG_INFO, "DMD", aFmt, aAp);
+#else
+ // The +64 is easily enough for the "DMD[<pid>] " prefix and the NUL.
+ size_t size = strlen(aFmt) + 64;
+ char* fmt = (char*)InfallibleAllocPolicy::malloc_(size);
+ snprintf(fmt, size, "DMD[%d] %s", getpid(), aFmt);
+ vfprintf(stderr, fmt, aAp);
+ InfallibleAllocPolicy::free_(fmt);
+#endif
+}
+
+/* static */
+void InfallibleAllocPolicy::ExitOnFailure(const void* aP) {
+ if (!aP) {
+ MOZ_CRASH("DMD out of memory; aborting");
+ }
+}
+
+static double Percent(size_t part, size_t whole) {
+ return (whole == 0) ? 0 : 100 * (double)part / whole;
+}
+
+// Commifies the number.
+static char* Show(size_t n, char* buf, size_t buflen) {
+ int nc = 0, i = 0, lasti = buflen - 2;
+ buf[lasti + 1] = '\0';
+ if (n == 0) {
+ buf[lasti - i] = '0';
+ i++;
+ } else {
+ while (n > 0) {
+ if (((i - nc) % 3) == 0 && i != 0) {
+ buf[lasti - i] = ',';
+ i++;
+ nc++;
+ }
+ buf[lasti - i] = static_cast<char>((n % 10) + '0');
+ i++;
+ n /= 10;
+ }
+ }
+ int firstCharIndex = lasti - i + 1;
+
+ MOZ_ASSERT(firstCharIndex >= 0);
+ return &buf[firstCharIndex];
+}
+
+//---------------------------------------------------------------------------
+// Options (Part 1)
+//---------------------------------------------------------------------------
+
+class Options {
+ template <typename T>
+ struct NumOption {
+ const T mDefault;
+ const T mMax;
+ T mActual;
+ NumOption(T aDefault, T aMax)
+ : mDefault(aDefault), mMax(aMax), mActual(aDefault) {}
+ };
+
+ // DMD has several modes. These modes affect what data is recorded and
+ // written to the output file, and the written data affects the
+ // post-processing that dmd.py can do.
+ //
+ // Users specify the mode as soon as DMD starts. This leads to minimal memory
+ // usage and log file size. It has the disadvantage that is inflexible -- if
+ // you want to change modes you have to re-run DMD. But in practice changing
+ // modes seems to be rare, so it's not much of a problem.
+ //
+ // An alternative possibility would be to always record and output *all* the
+ // information needed for all modes. This would let you choose the mode when
+ // running dmd.py, and so you could do multiple kinds of profiling on a
+ // single DMD run. But if you are only interested in one of the simpler
+ // modes, you'd pay the price of (a) increased memory usage and (b) *very*
+ // large log files.
+ //
+ // Finally, another alternative possibility would be to do mode selection
+ // partly at DMD startup or recording, and then partly in dmd.py. This would
+ // give some extra flexibility at moderate memory and file size cost. But
+ // certain mode pairs wouldn't work, which would be confusing.
+ //
+ enum class Mode {
+ // For each live block, this mode outputs: size (usable and slop) and
+ // (possibly) and allocation stack. This mode is good for live heap
+ // profiling.
+ Live,
+
+ // Like "Live", but for each live block it also outputs: zero or more
+ // report stacks. This mode is good for identifying where memory reporters
+ // should be added. This is the default mode.
+ DarkMatter,
+
+ // Like "Live", but also outputs the same data for dead blocks. This mode
+ // does cumulative heap profiling, which is good for identifying where large
+ // amounts of short-lived allocations ("heap churn") occur.
+ Cumulative,
+
+ // Like "Live", but this mode also outputs for each live block the address
+ // of the block and the values contained in the blocks. This mode is useful
+ // for investigating leaks, by helping to figure out which blocks refer to
+ // other blocks. This mode force-enables full stacks coverage.
+ Scan
+ };
+
+ // With full stacks, every heap block gets a stack trace recorded for it.
+ // This is complete but slow.
+ //
+ // With partial stacks, not all heap blocks will get a stack trace recorded.
+ // A Bernoulli trial (see mfbt/FastBernoulliTrial.h for details) is performed
+ // for each heap block to decide if it gets one. Because bigger heap blocks
+ // are more likely to get a stack trace, even though most heap *blocks* won't
+ // get a stack trace, most heap *bytes* will.
+ enum class Stacks { Full, Partial };
+
+ char* mDMDEnvVar; // a saved copy, for later printing
+
+ Mode mMode;
+ Stacks mStacks;
+ bool mShowDumpStats;
+
+ void BadArg(const char* aArg);
+ static const char* ValueIfMatch(const char* aArg, const char* aOptionName);
+ static bool GetLong(const char* aArg, const char* aOptionName, long aMin,
+ long aMax, long* aValue);
+ static bool GetBool(const char* aArg, const char* aOptionName, bool* aValue);
+
+ public:
+ explicit Options(const char* aDMDEnvVar);
+
+ bool IsLiveMode() const { return mMode == Mode::Live; }
+ bool IsDarkMatterMode() const { return mMode == Mode::DarkMatter; }
+ bool IsCumulativeMode() const { return mMode == Mode::Cumulative; }
+ bool IsScanMode() const { return mMode == Mode::Scan; }
+
+ const char* ModeString() const;
+
+ const char* DMDEnvVar() const { return mDMDEnvVar; }
+
+ bool DoFullStacks() const { return mStacks == Stacks::Full; }
+ size_t ShowDumpStats() const { return mShowDumpStats; }
+};
+
+static Options* gOptions;
+
+//---------------------------------------------------------------------------
+// The global lock
+//---------------------------------------------------------------------------
+
+// MutexBase implements the platform-specific parts of a mutex.
+
+#ifdef XP_WIN
+
+class MutexBase {
+ CRITICAL_SECTION mCS;
+
+ DISALLOW_COPY_AND_ASSIGN(MutexBase);
+
+ public:
+ MutexBase() { InitializeCriticalSection(&mCS); }
+ ~MutexBase() { DeleteCriticalSection(&mCS); }
+
+ void Lock() { EnterCriticalSection(&mCS); }
+ void Unlock() { LeaveCriticalSection(&mCS); }
+};
+
+#else
+
+class MutexBase {
+ pthread_mutex_t mMutex;
+
+ MutexBase(const MutexBase&) = delete;
+
+ const MutexBase& operator=(const MutexBase&) = delete;
+
+ public:
+ MutexBase() { pthread_mutex_init(&mMutex, nullptr); }
+
+ void Lock() { pthread_mutex_lock(&mMutex); }
+ void Unlock() { pthread_mutex_unlock(&mMutex); }
+};
+
+#endif
+
+class Mutex : private MutexBase {
+ bool mIsLocked;
+
+ Mutex(const Mutex&) = delete;
+
+ const Mutex& operator=(const Mutex&) = delete;
+
+ public:
+ Mutex() : mIsLocked(false) {}
+
+ void Lock() {
+ MutexBase::Lock();
+ MOZ_ASSERT(!mIsLocked);
+ mIsLocked = true;
+ }
+
+ void Unlock() {
+ MOZ_ASSERT(mIsLocked);
+ mIsLocked = false;
+ MutexBase::Unlock();
+ }
+
+ bool IsLocked() { return mIsLocked; }
+};
+
+// This lock must be held while manipulating global state such as
+// gStackTraceTable, gLiveBlockTable, gDeadBlockTable. Note that gOptions is
+// *not* protected by this lock because it is only written to by Options(),
+// which is only invoked at start-up and in ResetEverything(), which is only
+// used by SmokeDMD.cpp.
+static Mutex* gStateLock = nullptr;
+
+class AutoLockState {
+ AutoLockState(const AutoLockState&) = delete;
+
+ const AutoLockState& operator=(const AutoLockState&) = delete;
+
+ public:
+ AutoLockState() { gStateLock->Lock(); }
+ ~AutoLockState() { gStateLock->Unlock(); }
+};
+
+class AutoUnlockState {
+ AutoUnlockState(const AutoUnlockState&) = delete;
+
+ const AutoUnlockState& operator=(const AutoUnlockState&) = delete;
+
+ public:
+ AutoUnlockState() { gStateLock->Unlock(); }
+ ~AutoUnlockState() { gStateLock->Lock(); }
+};
+
+//---------------------------------------------------------------------------
+// Per-thread blocking of intercepts
+//---------------------------------------------------------------------------
+
+// On MacOS, the first __thread/thread_local access calls malloc, which leads
+// to an infinite loop. So we use pthread-based TLS instead, which somehow
+// doesn't have this problem.
+#if !defined(XP_DARWIN)
+# define DMD_THREAD_LOCAL(T) MOZ_THREAD_LOCAL(T)
+#else
+# define DMD_THREAD_LOCAL(T) \
+ detail::ThreadLocal<T, detail::ThreadLocalKeyStorage>
+#endif
+
+class Thread {
+ // Required for allocation via InfallibleAllocPolicy::new_.
+ friend class InfallibleAllocPolicy;
+
+ // When true, this blocks intercepts, which allows malloc interception
+ // functions to themselves call malloc. (Nb: for direct calls to malloc we
+ // can just use InfallibleAllocPolicy::{malloc_,new_}, but we sometimes
+ // indirectly call vanilla malloc via functions like MozStackWalk.)
+ bool mBlockIntercepts;
+
+ Thread() : mBlockIntercepts(false) {}
+
+ Thread(const Thread&) = delete;
+
+ const Thread& operator=(const Thread&) = delete;
+
+ static DMD_THREAD_LOCAL(Thread*) tlsThread;
+
+ public:
+ static void Init() {
+ if (!tlsThread.init()) {
+ MOZ_CRASH();
+ }
+ }
+
+ static Thread* Fetch() {
+ Thread* t = tlsThread.get();
+ if (MOZ_UNLIKELY(!t)) {
+ // This memory is never freed, even if the thread dies. It's a leak, but
+ // only a tiny one.
+ t = InfallibleAllocPolicy::new_<Thread>();
+ tlsThread.set(t);
+ }
+
+ return t;
+ }
+
+ bool BlockIntercepts() {
+ MOZ_ASSERT(!mBlockIntercepts);
+ return mBlockIntercepts = true;
+ }
+
+ bool UnblockIntercepts() {
+ MOZ_ASSERT(mBlockIntercepts);
+ return mBlockIntercepts = false;
+ }
+
+ bool InterceptsAreBlocked() const { return mBlockIntercepts; }
+};
+
+DMD_THREAD_LOCAL(Thread*) Thread::tlsThread;
+
+// An object of this class must be created (on the stack) before running any
+// code that might allocate.
+class AutoBlockIntercepts {
+ Thread* const mT;
+
+ AutoBlockIntercepts(const AutoBlockIntercepts&) = delete;
+
+ const AutoBlockIntercepts& operator=(const AutoBlockIntercepts&) = delete;
+
+ public:
+ explicit AutoBlockIntercepts(Thread* aT) : mT(aT) { mT->BlockIntercepts(); }
+ ~AutoBlockIntercepts() {
+ MOZ_ASSERT(mT->InterceptsAreBlocked());
+ mT->UnblockIntercepts();
+ }
+};
+
+//---------------------------------------------------------------------------
+// Location service
+//---------------------------------------------------------------------------
+
+struct DescribeCodeAddressLock {
+ static void Unlock() { gStateLock->Unlock(); }
+ static void Lock() { gStateLock->Lock(); }
+ static bool IsLocked() { return gStateLock->IsLocked(); }
+};
+
+typedef CodeAddressService<InfallibleAllocPolicy, DescribeCodeAddressLock>
+ CodeAddressService;
+
+//---------------------------------------------------------------------------
+// Stack traces
+//---------------------------------------------------------------------------
+
+class StackTrace {
+ public:
+ static const uint32_t MaxFrames = 24;
+
+ private:
+ uint32_t mLength; // The number of PCs.
+ const void* mPcs[MaxFrames]; // The PCs themselves.
+
+ public:
+ StackTrace() : mLength(0) {}
+ StackTrace(const StackTrace& aOther) : mLength(aOther.mLength) {
+ PodCopy(mPcs, aOther.mPcs, mLength);
+ }
+
+ uint32_t Length() const { return mLength; }
+ const void* Pc(uint32_t i) const {
+ MOZ_ASSERT(i < mLength);
+ return mPcs[i];
+ }
+
+ uint32_t Size() const { return mLength * sizeof(mPcs[0]); }
+
+ // The stack trace returned by this function is interned in gStackTraceTable,
+ // and so is immortal and unmovable.
+ static const StackTrace* Get(Thread* aT);
+
+ // Hash policy.
+
+ typedef StackTrace* Lookup;
+
+ static mozilla::HashNumber hash(const StackTrace* const& aSt) {
+ return mozilla::HashBytes(aSt->mPcs, aSt->Size());
+ }
+
+ static bool match(const StackTrace* const& aA, const StackTrace* const& aB) {
+ return aA->mLength == aB->mLength &&
+ memcmp(aA->mPcs, aB->mPcs, aA->Size()) == 0;
+ }
+
+ private:
+ static void StackWalkCallback(uint32_t aFrameNumber, void* aPc, void* aSp,
+ void* aClosure) {
+ StackTrace* st = (StackTrace*)aClosure;
+ MOZ_ASSERT(st->mLength < MaxFrames);
+ st->mPcs[st->mLength] = aPc;
+ st->mLength++;
+ MOZ_ASSERT(st->mLength == aFrameNumber);
+ }
+};
+
+typedef mozilla::HashSet<StackTrace*, StackTrace, InfallibleAllocPolicy>
+ StackTraceTable;
+static StackTraceTable* gStackTraceTable = nullptr;
+
+typedef mozilla::HashSet<const StackTrace*,
+ mozilla::DefaultHasher<const StackTrace*>,
+ InfallibleAllocPolicy>
+ StackTraceSet;
+
+typedef mozilla::HashSet<const void*, mozilla::DefaultHasher<const void*>,
+ InfallibleAllocPolicy>
+ PointerSet;
+typedef mozilla::HashMap<const void*, uint32_t,
+ mozilla::DefaultHasher<const void*>,
+ InfallibleAllocPolicy>
+ PointerIdMap;
+
+// We won't GC the stack trace table until it this many elements.
+static uint32_t gGCStackTraceTableWhenSizeExceeds = 4 * 1024;
+
+/* static */ const StackTrace* StackTrace::Get(Thread* aT) {
+ MOZ_ASSERT(gStateLock->IsLocked());
+ MOZ_ASSERT(aT->InterceptsAreBlocked());
+
+ // On Windows, MozStackWalk can acquire a lock from the shared library
+ // loader. Another thread might call malloc while holding that lock (when
+ // loading a shared library). So we can't be in gStateLock during the call
+ // to MozStackWalk. For details, see
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=374829#c8
+ // On Linux, something similar can happen; see bug 824340.
+ // So let's just release it on all platforms.
+ StackTrace tmp;
+ {
+ AutoUnlockState unlock;
+ // In each of the following cases, skipFrames is chosen so that the
+ // first frame in each stack trace is a replace_* function (or as close as
+ // possible, given the vagaries of inlining on different platforms).
+#if defined(XP_WIN) && defined(_M_IX86)
+ // This avoids MozStackWalk(), which causes unusably slow startup on Win32
+ // when it is called during static initialization (see bug 1241684).
+ //
+ // This code is cribbed from the Gecko Profiler, which also uses
+ // FramePointerStackWalk() on Win32: REGISTERS_SYNC_POPULATE() for the
+ // frame pointer, and GetStackTop() for the stack end.
+ CONTEXT context;
+ RtlCaptureContext(&context);
+ void** fp = reinterpret_cast<void**>(context.Ebp);
+
+ PNT_TIB pTib = reinterpret_cast<PNT_TIB>(NtCurrentTeb());
+ void* stackEnd = static_cast<void*>(pTib->StackBase);
+ FramePointerStackWalk(StackWalkCallback, MaxFrames, &tmp, fp, stackEnd);
+#elif defined(XP_MACOSX)
+ // This avoids MozStackWalk(), which has become unusably slow on Mac due to
+ // changes in libunwind.
+ //
+ // This code is cribbed from the Gecko Profiler, which also uses
+ // FramePointerStackWalk() on Mac: REGISTERS_SYNC_POPULATE() for the frame
+ // pointer, and GetStackTop() for the stack end.
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wframe-address"
+ void** fp = reinterpret_cast<void**>(__builtin_frame_address(1));
+# pragma GCC diagnostic pop
+ void* stackEnd = pthread_get_stackaddr_np(pthread_self());
+ FramePointerStackWalk(StackWalkCallback, MaxFrames, &tmp, fp, stackEnd);
+#else
+ MozStackWalk(StackWalkCallback, nullptr, MaxFrames, &tmp);
+#endif
+ }
+
+ StackTraceTable::AddPtr p = gStackTraceTable->lookupForAdd(&tmp);
+ if (!p) {
+ StackTrace* stnew = InfallibleAllocPolicy::new_<StackTrace>(tmp);
+ MOZ_ALWAYS_TRUE(gStackTraceTable->add(p, stnew));
+ }
+ return *p;
+}
+
+//---------------------------------------------------------------------------
+// Heap blocks
+//---------------------------------------------------------------------------
+
+// This class combines a 2-byte-aligned pointer (i.e. one whose bottom bit
+// is zero) with a 1-bit tag.
+//
+// |T| is the pointer type, e.g. |int*|, not the pointed-to type. This makes
+// is easier to have const pointers, e.g. |TaggedPtr<const int*>|.
+template <typename T>
+class TaggedPtr {
+ union {
+ T mPtr;
+ uintptr_t mUint;
+ };
+
+ static const uintptr_t kTagMask = uintptr_t(0x1);
+ static const uintptr_t kPtrMask = ~kTagMask;
+
+ static bool IsTwoByteAligned(T aPtr) {
+ return (uintptr_t(aPtr) & kTagMask) == 0;
+ }
+
+ public:
+ TaggedPtr() : mPtr(nullptr) {}
+
+ TaggedPtr(T aPtr, bool aBool) : mPtr(aPtr) {
+ MOZ_ASSERT(IsTwoByteAligned(aPtr));
+ uintptr_t tag = uintptr_t(aBool);
+ MOZ_ASSERT(tag <= kTagMask);
+ mUint |= (tag & kTagMask);
+ }
+
+ void Set(T aPtr, bool aBool) {
+ MOZ_ASSERT(IsTwoByteAligned(aPtr));
+ mPtr = aPtr;
+ uintptr_t tag = uintptr_t(aBool);
+ MOZ_ASSERT(tag <= kTagMask);
+ mUint |= (tag & kTagMask);
+ }
+
+ T Ptr() const { return reinterpret_cast<T>(mUint & kPtrMask); }
+
+ bool Tag() const { return bool(mUint & kTagMask); }
+};
+
+// A live heap block. Stores both basic data and data about reports, if we're
+// in DarkMatter mode.
+class LiveBlock {
+ const void* mPtr;
+ const size_t mReqSize; // size requested
+
+ // The stack trace where this block was allocated, or nullptr if we didn't
+ // record one.
+ const StackTrace* const mAllocStackTrace;
+
+ // This array has two elements because we record at most two reports of a
+ // block.
+ // - Ptr: |mReportStackTrace| - stack trace where this block was reported.
+ // nullptr if not reported.
+ // - Tag bit 0: |mReportedOnAlloc| - was the block reported immediately on
+ // allocation? If so, DMD must not clear the report at the end of
+ // Analyze(). Only relevant if |mReportStackTrace| is non-nullptr.
+ //
+ // |mPtr| is used as the key in LiveBlockTable, so it's ok for this member
+ // to be |mutable|.
+ //
+ // Only used in DarkMatter mode.
+ mutable TaggedPtr<const StackTrace*> mReportStackTrace_mReportedOnAlloc[2];
+
+ public:
+ LiveBlock(const void* aPtr, size_t aReqSize,
+ const StackTrace* aAllocStackTrace)
+ : mPtr(aPtr),
+ mReqSize(aReqSize),
+ mAllocStackTrace(aAllocStackTrace),
+ mReportStackTrace_mReportedOnAlloc() // all fields get zeroed
+ {}
+
+ const void* Address() const { return mPtr; }
+
+ size_t ReqSize() const { return mReqSize; }
+
+ size_t SlopSize() const { return MallocSizeOf(mPtr) - mReqSize; }
+
+ const StackTrace* AllocStackTrace() const { return mAllocStackTrace; }
+
+ const StackTrace* ReportStackTrace1() const {
+ MOZ_ASSERT(gOptions->IsDarkMatterMode());
+ return mReportStackTrace_mReportedOnAlloc[0].Ptr();
+ }
+
+ const StackTrace* ReportStackTrace2() const {
+ MOZ_ASSERT(gOptions->IsDarkMatterMode());
+ return mReportStackTrace_mReportedOnAlloc[1].Ptr();
+ }
+
+ bool ReportedOnAlloc1() const {
+ MOZ_ASSERT(gOptions->IsDarkMatterMode());
+ return mReportStackTrace_mReportedOnAlloc[0].Tag();
+ }
+
+ bool ReportedOnAlloc2() const {
+ MOZ_ASSERT(gOptions->IsDarkMatterMode());
+ return mReportStackTrace_mReportedOnAlloc[1].Tag();
+ }
+
+ void AddStackTracesToTable(StackTraceSet& aStackTraces) const {
+ if (AllocStackTrace()) {
+ MOZ_ALWAYS_TRUE(aStackTraces.put(AllocStackTrace()));
+ }
+ if (gOptions->IsDarkMatterMode()) {
+ if (ReportStackTrace1()) {
+ MOZ_ALWAYS_TRUE(aStackTraces.put(ReportStackTrace1()));
+ }
+ if (ReportStackTrace2()) {
+ MOZ_ALWAYS_TRUE(aStackTraces.put(ReportStackTrace2()));
+ }
+ }
+ }
+
+ uint32_t NumReports() const {
+ MOZ_ASSERT(gOptions->IsDarkMatterMode());
+ if (ReportStackTrace2()) {
+ MOZ_ASSERT(ReportStackTrace1());
+ return 2;
+ }
+ if (ReportStackTrace1()) {
+ return 1;
+ }
+ return 0;
+ }
+
+ // This is |const| thanks to the |mutable| fields above.
+ void Report(Thread* aT, bool aReportedOnAlloc) const {
+ MOZ_ASSERT(gOptions->IsDarkMatterMode());
+ // We don't bother recording reports after the 2nd one.
+ uint32_t numReports = NumReports();
+ if (numReports < 2) {
+ mReportStackTrace_mReportedOnAlloc[numReports].Set(StackTrace::Get(aT),
+ aReportedOnAlloc);
+ }
+ }
+
+ void UnreportIfNotReportedOnAlloc() const {
+ MOZ_ASSERT(gOptions->IsDarkMatterMode());
+ if (!ReportedOnAlloc1() && !ReportedOnAlloc2()) {
+ mReportStackTrace_mReportedOnAlloc[0].Set(nullptr, 0);
+ mReportStackTrace_mReportedOnAlloc[1].Set(nullptr, 0);
+
+ } else if (!ReportedOnAlloc1() && ReportedOnAlloc2()) {
+ // Shift the 2nd report down to the 1st one.
+ mReportStackTrace_mReportedOnAlloc[0] =
+ mReportStackTrace_mReportedOnAlloc[1];
+ mReportStackTrace_mReportedOnAlloc[1].Set(nullptr, 0);
+
+ } else if (ReportedOnAlloc1() && !ReportedOnAlloc2()) {
+ mReportStackTrace_mReportedOnAlloc[1].Set(nullptr, 0);
+ }
+ }
+
+ // Hash policy.
+
+ typedef const void* Lookup;
+
+ static mozilla::HashNumber hash(const void* const& aPtr) {
+ return mozilla::HashGeneric(aPtr);
+ }
+
+ static bool match(const LiveBlock& aB, const void* const& aPtr) {
+ return aB.mPtr == aPtr;
+ }
+};
+
+// A table of live blocks where the lookup key is the block address.
+typedef mozilla::HashSet<LiveBlock, LiveBlock, InfallibleAllocPolicy>
+ LiveBlockTable;
+static LiveBlockTable* gLiveBlockTable = nullptr;
+
+class AggregatedLiveBlockHashPolicy {
+ public:
+ typedef const LiveBlock* const Lookup;
+
+ static mozilla::HashNumber hash(const LiveBlock* const& aB) {
+ return gOptions->IsDarkMatterMode()
+ ? mozilla::HashGeneric(
+ aB->ReqSize(), aB->SlopSize(), aB->AllocStackTrace(),
+ aB->ReportedOnAlloc1(), aB->ReportedOnAlloc2())
+ : mozilla::HashGeneric(aB->ReqSize(), aB->SlopSize(),
+ aB->AllocStackTrace());
+ }
+
+ static bool match(const LiveBlock* const& aA, const LiveBlock* const& aB) {
+ return gOptions->IsDarkMatterMode()
+ ? aA->ReqSize() == aB->ReqSize() &&
+ aA->SlopSize() == aB->SlopSize() &&
+ aA->AllocStackTrace() == aB->AllocStackTrace() &&
+ aA->ReportStackTrace1() == aB->ReportStackTrace1() &&
+ aA->ReportStackTrace2() == aB->ReportStackTrace2()
+ : aA->ReqSize() == aB->ReqSize() &&
+ aA->SlopSize() == aB->SlopSize() &&
+ aA->AllocStackTrace() == aB->AllocStackTrace();
+ }
+};
+
+// A table of live blocks where the lookup key is everything but the block
+// address. For aggregating similar live blocks at output time.
+typedef mozilla::HashMap<const LiveBlock*, size_t,
+ AggregatedLiveBlockHashPolicy, InfallibleAllocPolicy>
+ AggregatedLiveBlockTable;
+
+// A freed heap block.
+class DeadBlock {
+ const size_t mReqSize; // size requested
+ const size_t mSlopSize; // slop above size requested
+
+ // The stack trace where this block was allocated.
+ const StackTrace* const mAllocStackTrace;
+
+ public:
+ DeadBlock() : mReqSize(0), mSlopSize(0), mAllocStackTrace(nullptr) {}
+
+ explicit DeadBlock(const LiveBlock& aLb)
+ : mReqSize(aLb.ReqSize()),
+ mSlopSize(aLb.SlopSize()),
+ mAllocStackTrace(aLb.AllocStackTrace()) {}
+
+ ~DeadBlock() {}
+
+ size_t ReqSize() const { return mReqSize; }
+ size_t SlopSize() const { return mSlopSize; }
+
+ const StackTrace* AllocStackTrace() const { return mAllocStackTrace; }
+
+ void AddStackTracesToTable(StackTraceSet& aStackTraces) const {
+ if (AllocStackTrace()) {
+ MOZ_ALWAYS_TRUE(aStackTraces.put(AllocStackTrace()));
+ }
+ }
+
+ // Hash policy.
+
+ typedef DeadBlock Lookup;
+
+ static mozilla::HashNumber hash(const DeadBlock& aB) {
+ return mozilla::HashGeneric(aB.ReqSize(), aB.SlopSize(),
+ aB.AllocStackTrace());
+ }
+
+ static bool match(const DeadBlock& aA, const DeadBlock& aB) {
+ return aA.ReqSize() == aB.ReqSize() && aA.SlopSize() == aB.SlopSize() &&
+ aA.AllocStackTrace() == aB.AllocStackTrace();
+ }
+};
+
+// For each unique DeadBlock value we store a count of how many actual dead
+// blocks have that value.
+typedef mozilla::HashMap<DeadBlock, size_t, DeadBlock, InfallibleAllocPolicy>
+ DeadBlockTable;
+static DeadBlockTable* gDeadBlockTable = nullptr;
+
+// Add the dead block to the dead block table, if that's appropriate.
+void MaybeAddToDeadBlockTable(const DeadBlock& aDb) {
+ if (gOptions->IsCumulativeMode() && aDb.AllocStackTrace()) {
+ AutoLockState lock;
+ if (DeadBlockTable::AddPtr p = gDeadBlockTable->lookupForAdd(aDb)) {
+ p->value() += 1;
+ } else {
+ MOZ_ALWAYS_TRUE(gDeadBlockTable->add(p, aDb, 1));
+ }
+ }
+}
+
+// Add a pointer to each live stack trace into the given StackTraceSet. (A
+// stack trace is live if it's used by one of the live blocks.)
+static void GatherUsedStackTraces(StackTraceSet& aStackTraces) {
+ MOZ_ASSERT(gStateLock->IsLocked());
+ MOZ_ASSERT(Thread::Fetch()->InterceptsAreBlocked());
+
+ aStackTraces.clear();
+ MOZ_ALWAYS_TRUE(aStackTraces.reserve(512));
+
+ for (auto iter = gLiveBlockTable->iter(); !iter.done(); iter.next()) {
+ iter.get().AddStackTracesToTable(aStackTraces);
+ }
+
+ for (auto iter = gDeadBlockTable->iter(); !iter.done(); iter.next()) {
+ iter.get().key().AddStackTracesToTable(aStackTraces);
+ }
+}
+
+// Delete stack traces that we aren't using, and compact our hashtable.
+static void GCStackTraces() {
+ MOZ_ASSERT(gStateLock->IsLocked());
+ MOZ_ASSERT(Thread::Fetch()->InterceptsAreBlocked());
+
+ StackTraceSet usedStackTraces;
+ GatherUsedStackTraces(usedStackTraces);
+
+ // Delete all unused stack traces from gStackTraceTable. The ModIterator
+ // destructor will automatically rehash and compact the table.
+ for (auto iter = gStackTraceTable->modIter(); !iter.done(); iter.next()) {
+ StackTrace* const& st = iter.get();
+ if (!usedStackTraces.has(st)) {
+ iter.remove();
+ InfallibleAllocPolicy::delete_(st);
+ }
+ }
+
+ // Schedule a GC when we have twice as many stack traces as we had right after
+ // this GC finished.
+ gGCStackTraceTableWhenSizeExceeds = 2 * gStackTraceTable->count();
+}
+
+//---------------------------------------------------------------------------
+// malloc/free callbacks
+//---------------------------------------------------------------------------
+
+static FastBernoulliTrial* gBernoulli;
+
+// In testing, a probability of 0.003 resulted in ~25% of heap blocks getting
+// a stack trace and ~80% of heap bytes getting a stack trace. (This is
+// possible because big heap blocks are more likely to get a stack trace.)
+//
+// We deliberately choose not to give the user control over this probability
+// (other than effectively setting it to 1 via --stacks=full) because it's
+// quite inscrutable and generally the user just wants "faster and imprecise"
+// or "slower and precise".
+//
+// The random number seeds are arbitrary and were obtained from random.org. If
+// you change them you'll need to change the tests as well, because their
+// expected output is based on the particular sequence of trial results that we
+// get with these seeds.
+static void ResetBernoulli() {
+ new (gBernoulli)
+ FastBernoulliTrial(0.003, 0x8e26eeee166bc8ca, 0x56820f304a9c9ae0);
+}
+
+static void AllocCallback(void* aPtr, size_t aReqSize, Thread* aT) {
+ if (!aPtr) {
+ return;
+ }
+
+ AutoLockState lock;
+ AutoBlockIntercepts block(aT);
+
+ size_t actualSize = gMallocTable.malloc_usable_size(aPtr);
+
+ // We may or may not record the allocation stack trace, depending on the
+ // options and the outcome of a Bernoulli trial.
+ bool getTrace = gOptions->DoFullStacks() || gBernoulli->trial(actualSize);
+ LiveBlock b(aPtr, aReqSize, getTrace ? StackTrace::Get(aT) : nullptr);
+ LiveBlockTable::AddPtr p = gLiveBlockTable->lookupForAdd(aPtr);
+ if (!p) {
+ // Most common case: there wasn't a record already.
+ MOZ_ALWAYS_TRUE(gLiveBlockTable->add(p, b));
+ } else {
+ // Edge-case: there was a record for the same address. We'll assume the
+ // allocator is not giving out a pointer to an existing allocation, so
+ // this means the previously recorded allocation was freed while we were
+ // blocking interceptions. This can happen while processing the data in
+ // e.g. AnalyzeImpl.
+ if (gOptions->IsCumulativeMode()) {
+ // Copy it out so it can be added to the dead block list later.
+ DeadBlock db(*p);
+ MaybeAddToDeadBlockTable(db);
+ }
+ gLiveBlockTable->remove(p);
+ MOZ_ALWAYS_TRUE(gLiveBlockTable->putNew(aPtr, b));
+ }
+}
+
+static void FreeCallback(void* aPtr, Thread* aT, DeadBlock* aDeadBlock) {
+ if (!aPtr) {
+ return;
+ }
+
+ AutoLockState lock;
+ AutoBlockIntercepts block(aT);
+
+ if (LiveBlockTable::Ptr lb = gLiveBlockTable->lookup(aPtr)) {
+ if (gOptions->IsCumulativeMode()) {
+ // Copy it out so it can be added to the dead block list later.
+ new (aDeadBlock) DeadBlock(*lb);
+ }
+ gLiveBlockTable->remove(lb);
+ } else {
+ // We have no record of the block. It must be a bogus pointer, or one that
+ // DMD wasn't able to see allocated. This should be extremely rare.
+ }
+
+ if (gStackTraceTable->count() > gGCStackTraceTableWhenSizeExceeds) {
+ GCStackTraces();
+ }
+}
+
+//---------------------------------------------------------------------------
+// malloc/free interception
+//---------------------------------------------------------------------------
+
+static bool Init(malloc_table_t* aMallocTable);
+
+} // namespace dmd
+} // namespace mozilla
+
+static void* replace_malloc(size_t aSize) {
+ using namespace mozilla::dmd;
+
+ Thread* t = Thread::Fetch();
+ if (t->InterceptsAreBlocked()) {
+ // Intercepts are blocked, which means this must be a call to malloc
+ // triggered indirectly by DMD (e.g. via MozStackWalk). Be infallible.
+ return InfallibleAllocPolicy::malloc_(aSize);
+ }
+
+ // This must be a call to malloc from outside DMD. Intercept it.
+ void* ptr = gMallocTable.malloc(aSize);
+ AllocCallback(ptr, aSize, t);
+ return ptr;
+}
+
+static void* replace_calloc(size_t aCount, size_t aSize) {
+ using namespace mozilla::dmd;
+
+ Thread* t = Thread::Fetch();
+ if (t->InterceptsAreBlocked()) {
+ return InfallibleAllocPolicy::calloc_(aCount, aSize);
+ }
+
+ // |aCount * aSize| could overflow, but if that happens then
+ // |gMallocTable.calloc()| will return nullptr and |AllocCallback()| will
+ // return immediately without using the overflowed value.
+ void* ptr = gMallocTable.calloc(aCount, aSize);
+ AllocCallback(ptr, aCount * aSize, t);
+ return ptr;
+}
+
+static void* replace_realloc(void* aOldPtr, size_t aSize) {
+ using namespace mozilla::dmd;
+
+ Thread* t = Thread::Fetch();
+ if (t->InterceptsAreBlocked()) {
+ return InfallibleAllocPolicy::realloc_(aOldPtr, aSize);
+ }
+
+ // If |aOldPtr| is nullptr, the call is equivalent to |malloc(aSize)|.
+ if (!aOldPtr) {
+ return replace_malloc(aSize);
+ }
+
+ // Be very careful here! Must remove the block from the table before doing
+ // the realloc to avoid races, just like in replace_free().
+ // Nb: This does an unnecessary hashtable remove+add if the block doesn't
+ // move, but doing better isn't worth the effort.
+ DeadBlock db;
+ FreeCallback(aOldPtr, t, &db);
+ void* ptr = gMallocTable.realloc(aOldPtr, aSize);
+ if (ptr) {
+ AllocCallback(ptr, aSize, t);
+ MaybeAddToDeadBlockTable(db);
+ } else {
+ // If realloc fails, we undo the prior operations by re-inserting the old
+ // pointer into the live block table. We don't have to do anything with the
+ // dead block list because the dead block hasn't yet been inserted. The
+ // block will end up looking like it was allocated for the first time here,
+ // which is untrue, and the slop bytes will be zero, which may be untrue.
+ // But this case is rare and doing better isn't worth the effort.
+ AllocCallback(aOldPtr, gMallocTable.malloc_usable_size(aOldPtr), t);
+ }
+ return ptr;
+}
+
+static void* replace_memalign(size_t aAlignment, size_t aSize) {
+ using namespace mozilla::dmd;
+
+ Thread* t = Thread::Fetch();
+ if (t->InterceptsAreBlocked()) {
+ return InfallibleAllocPolicy::memalign_(aAlignment, aSize);
+ }
+
+ void* ptr = gMallocTable.memalign(aAlignment, aSize);
+ AllocCallback(ptr, aSize, t);
+ return ptr;
+}
+
+static void replace_free(void* aPtr) {
+ using namespace mozilla::dmd;
+
+ Thread* t = Thread::Fetch();
+ if (t->InterceptsAreBlocked()) {
+ return InfallibleAllocPolicy::free_(aPtr);
+ }
+
+ // Do the actual free after updating the table. Otherwise, another thread
+ // could call malloc and get the freed block and update the table, and then
+ // our update here would remove the newly-malloc'd block.
+ DeadBlock db;
+ FreeCallback(aPtr, t, &db);
+ MaybeAddToDeadBlockTable(db);
+ gMallocTable.free(aPtr);
+}
+
+void replace_init(malloc_table_t* aMallocTable, ReplaceMallocBridge** aBridge) {
+ if (mozilla::dmd::Init(aMallocTable)) {
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
+#define MALLOC_DECL(name, ...) aMallocTable->name = replace_##name;
+#include "malloc_decls.h"
+ *aBridge = mozilla::dmd::gDMDBridge;
+ }
+}
+
+namespace mozilla {
+namespace dmd {
+
+//---------------------------------------------------------------------------
+// Options (Part 2)
+//---------------------------------------------------------------------------
+
+// Given an |aOptionName| like "foo", succeed if |aArg| has the form "foo=blah"
+// (where "blah" is non-empty) and return the pointer to "blah". |aArg| can
+// have leading space chars (but not other whitespace).
+const char* Options::ValueIfMatch(const char* aArg, const char* aOptionName) {
+ MOZ_ASSERT(!isspace(*aArg)); // any leading whitespace should not remain
+ size_t optionLen = strlen(aOptionName);
+ if (strncmp(aArg, aOptionName, optionLen) == 0 && aArg[optionLen] == '=' &&
+ aArg[optionLen + 1]) {
+ return aArg + optionLen + 1;
+ }
+ return nullptr;
+}
+
+// Extracts a |long| value for an option from an argument. It must be within
+// the range |aMin..aMax| (inclusive).
+bool Options::GetLong(const char* aArg, const char* aOptionName, long aMin,
+ long aMax, long* aValue) {
+ if (const char* optionValue = ValueIfMatch(aArg, aOptionName)) {
+ char* endPtr;
+ *aValue = strtol(optionValue, &endPtr, /* base */ 10);
+ if (!*endPtr && aMin <= *aValue && *aValue <= aMax && *aValue != LONG_MIN &&
+ *aValue != LONG_MAX) {
+ return true;
+ }
+ }
+ return false;
+}
+
+// Extracts a |bool| value for an option -- encoded as "yes" or "no" -- from an
+// argument.
+bool Options::GetBool(const char* aArg, const char* aOptionName, bool* aValue) {
+ if (const char* optionValue = ValueIfMatch(aArg, aOptionName)) {
+ if (strcmp(optionValue, "yes") == 0) {
+ *aValue = true;
+ return true;
+ }
+ if (strcmp(optionValue, "no") == 0) {
+ *aValue = false;
+ return true;
+ }
+ }
+ return false;
+}
+
+Options::Options(const char* aDMDEnvVar)
+ : mDMDEnvVar(aDMDEnvVar ? InfallibleAllocPolicy::strdup_(aDMDEnvVar)
+ : nullptr),
+ mMode(Mode::DarkMatter),
+ mStacks(Stacks::Partial),
+ mShowDumpStats(false) {
+ char* e = mDMDEnvVar;
+ if (e && strcmp(e, "1") != 0) {
+ bool isEnd = false;
+ while (!isEnd) {
+ // Consume leading whitespace.
+ while (isspace(*e)) {
+ e++;
+ }
+
+ // Save the start of the arg.
+ const char* arg = e;
+
+ // Find the first char after the arg, and temporarily change it to '\0'
+ // to isolate the arg.
+ while (!isspace(*e) && *e != '\0') {
+ e++;
+ }
+ char replacedChar = *e;
+ isEnd = replacedChar == '\0';
+ *e = '\0';
+
+ // Handle arg
+ bool myBool;
+ if (strcmp(arg, "--mode=live") == 0) {
+ mMode = Mode::Live;
+ } else if (strcmp(arg, "--mode=dark-matter") == 0) {
+ mMode = Mode::DarkMatter;
+ } else if (strcmp(arg, "--mode=cumulative") == 0) {
+ mMode = Mode::Cumulative;
+ } else if (strcmp(arg, "--mode=scan") == 0) {
+ mMode = Mode::Scan;
+
+ } else if (strcmp(arg, "--stacks=full") == 0) {
+ mStacks = Stacks::Full;
+ } else if (strcmp(arg, "--stacks=partial") == 0) {
+ mStacks = Stacks::Partial;
+
+ } else if (GetBool(arg, "--show-dump-stats", &myBool)) {
+ mShowDumpStats = myBool;
+
+ } else if (strcmp(arg, "") == 0) {
+ // This can only happen if there is trailing whitespace. Ignore.
+ MOZ_ASSERT(isEnd);
+
+ } else {
+ BadArg(arg);
+ }
+
+ // Undo the temporary isolation.
+ *e = replacedChar;
+ }
+ }
+
+ if (mMode == Mode::Scan) {
+ mStacks = Stacks::Full;
+ }
+}
+
+void Options::BadArg(const char* aArg) {
+ StatusMsg("\n");
+ StatusMsg("Bad entry in the $DMD environment variable: '%s'.\n", aArg);
+ StatusMsg("See the output of |mach help run| for the allowed options.\n");
+ exit(1);
+}
+
+const char* Options::ModeString() const {
+ switch (mMode) {
+ case Mode::Live:
+ return "live";
+ case Mode::DarkMatter:
+ return "dark-matter";
+ case Mode::Cumulative:
+ return "cumulative";
+ case Mode::Scan:
+ return "scan";
+ default:
+ MOZ_ASSERT(false);
+ return "(unknown DMD mode)";
+ }
+}
+
+//---------------------------------------------------------------------------
+// DMD start-up
+//---------------------------------------------------------------------------
+
+#ifndef XP_WIN
+static void prefork() {
+ if (gStateLock) {
+ gStateLock->Lock();
+ }
+}
+
+static void postfork() {
+ if (gStateLock) {
+ gStateLock->Unlock();
+ }
+}
+#endif
+
+// WARNING: this function runs *very* early -- before all static initializers
+// have run. For this reason, non-scalar globals such as gStateLock and
+// gStackTraceTable are allocated dynamically (so we can guarantee their
+// construction in this function) rather than statically.
+static bool Init(malloc_table_t* aMallocTable) {
+ // DMD is controlled by the |DMD| environment variable.
+ const char* e = getenv("DMD");
+
+ if (!e) {
+ return false;
+ }
+ // Initialize the function table first, because StatusMsg uses
+ // InfallibleAllocPolicy::malloc_, which uses it.
+ gMallocTable = *aMallocTable;
+
+ StatusMsg("$DMD = '%s'\n", e);
+
+ gDMDBridge = InfallibleAllocPolicy::new_<DMDBridge>();
+
+#ifndef XP_WIN
+ // Avoid deadlocks when forking by acquiring our state lock prior to forking
+ // and releasing it after forking. See |LogAlloc|'s |replace_init| for
+ // in-depth details.
+ //
+ // Note: This must run after attempting an allocation so as to give the
+ // system malloc a chance to insert its own atfork handler.
+ pthread_atfork(prefork, postfork, postfork);
+#endif
+ // Parse $DMD env var.
+ gOptions = InfallibleAllocPolicy::new_<Options>(e);
+
+ gStateLock = InfallibleAllocPolicy::new_<Mutex>();
+
+ gBernoulli = (FastBernoulliTrial*)InfallibleAllocPolicy::malloc_(
+ sizeof(FastBernoulliTrial));
+ ResetBernoulli();
+
+ Thread::Init();
+
+ {
+ AutoLockState lock;
+
+ gStackTraceTable = InfallibleAllocPolicy::new_<StackTraceTable>(8192);
+ gLiveBlockTable = InfallibleAllocPolicy::new_<LiveBlockTable>(8192);
+
+ // Create this even if the mode isn't Cumulative (albeit with a small
+ // size), in case the mode is changed later on (as is done by SmokeDMD.cpp,
+ // for example).
+ size_t tableSize = gOptions->IsCumulativeMode() ? 8192 : 4;
+ gDeadBlockTable = InfallibleAllocPolicy::new_<DeadBlockTable>(tableSize);
+ }
+
+ return true;
+}
+
+//---------------------------------------------------------------------------
+// Block reporting and unreporting
+//---------------------------------------------------------------------------
+
+static void ReportHelper(const void* aPtr, bool aReportedOnAlloc) {
+ if (!gOptions->IsDarkMatterMode() || !aPtr) {
+ return;
+ }
+
+ Thread* t = Thread::Fetch();
+
+ AutoBlockIntercepts block(t);
+ AutoLockState lock;
+
+ if (LiveBlockTable::Ptr p = gLiveBlockTable->lookup(aPtr)) {
+ p->Report(t, aReportedOnAlloc);
+ } else {
+ // We have no record of the block. It must be a bogus pointer. This should
+ // be extremely rare because Report() is almost always called in
+ // conjunction with a malloc_size_of-style function. Print a message so
+ // that we get some feedback.
+ StatusMsg("Unknown pointer %p\n", aPtr);
+ }
+}
+
+void DMDFuncs::Report(const void* aPtr) {
+ ReportHelper(aPtr, /* onAlloc */ false);
+}
+
+void DMDFuncs::ReportOnAlloc(const void* aPtr) {
+ ReportHelper(aPtr, /* onAlloc */ true);
+}
+
+//---------------------------------------------------------------------------
+// DMD output
+//---------------------------------------------------------------------------
+
+// The version number of the output format. Increment this if you make
+// backwards-incompatible changes to the format. See DMD.h for the version
+// history.
+static const int kOutputVersionNumber = 5;
+
+// Note that, unlike most SizeOf* functions, this function does not take a
+// |mozilla::MallocSizeOf| argument. That's because those arguments are
+// primarily to aid DMD track heap blocks... but DMD deliberately doesn't track
+// heap blocks it allocated for itself!
+//
+// SizeOfInternal should be called while you're holding the state lock and
+// while intercepts are blocked; SizeOf acquires the lock and blocks
+// intercepts.
+
+static void SizeOfInternal(Sizes* aSizes) {
+ MOZ_ASSERT(gStateLock->IsLocked());
+ MOZ_ASSERT(Thread::Fetch()->InterceptsAreBlocked());
+
+ aSizes->Clear();
+
+ StackTraceSet usedStackTraces;
+ GatherUsedStackTraces(usedStackTraces);
+
+ for (auto iter = gStackTraceTable->iter(); !iter.done(); iter.next()) {
+ StackTrace* const& st = iter.get();
+
+ if (usedStackTraces.has(st)) {
+ aSizes->mStackTracesUsed += MallocSizeOf(st);
+ } else {
+ aSizes->mStackTracesUnused += MallocSizeOf(st);
+ }
+ }
+
+ aSizes->mStackTraceTable =
+ gStackTraceTable->shallowSizeOfIncludingThis(MallocSizeOf);
+
+ aSizes->mLiveBlockTable =
+ gLiveBlockTable->shallowSizeOfIncludingThis(MallocSizeOf);
+
+ aSizes->mDeadBlockTable =
+ gDeadBlockTable->shallowSizeOfIncludingThis(MallocSizeOf);
+}
+
+void DMDFuncs::SizeOf(Sizes* aSizes) {
+ aSizes->Clear();
+
+ AutoBlockIntercepts block(Thread::Fetch());
+ AutoLockState lock;
+ SizeOfInternal(aSizes);
+}
+
+void DMDFuncs::ClearReports() {
+ if (!gOptions->IsDarkMatterMode()) {
+ return;
+ }
+
+ AutoLockState lock;
+
+ // Unreport all blocks that were marked reported by a memory reporter. This
+ // excludes those that were reported on allocation, because they need to keep
+ // their reported marking.
+ for (auto iter = gLiveBlockTable->iter(); !iter.done(); iter.next()) {
+ iter.get().UnreportIfNotReportedOnAlloc();
+ }
+}
+
+class ToIdStringConverter final {
+ public:
+ ToIdStringConverter() : mIdMap(512), mNextId(0) {}
+
+ // Converts a pointer to a unique ID. Reuses the existing ID for the pointer
+ // if it's been seen before.
+ const char* ToIdString(const void* aPtr) {
+ uint32_t id;
+ PointerIdMap::AddPtr p = mIdMap.lookupForAdd(aPtr);
+ if (!p) {
+ id = mNextId++;
+ MOZ_ALWAYS_TRUE(mIdMap.add(p, aPtr, id));
+ } else {
+ id = p->value();
+ }
+ return Base32(id);
+ }
+
+ size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
+ return mIdMap.shallowSizeOfExcludingThis(aMallocSizeOf);
+ }
+
+ private:
+ // This function converts an integer to base-32. We use base-32 values for
+ // indexing into the traceTable and the frameTable, for the following reasons.
+ //
+ // - Base-32 gives more compact indices than base-16.
+ //
+ // - 32 is a power-of-two, which makes the necessary div/mod calculations
+ // fast.
+ //
+ // - We can (and do) choose non-numeric digits for base-32. When
+ // inspecting/debugging the JSON output, non-numeric indices are easier to
+ // search for than numeric indices.
+ //
+ char* Base32(uint32_t aN) {
+ static const char digits[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdef";
+
+ char* b = mIdBuf + kIdBufLen - 1;
+ *b = '\0';
+ do {
+ b--;
+ if (b == mIdBuf) {
+ MOZ_CRASH("Base32 buffer too small");
+ }
+ *b = digits[aN % 32];
+ aN /= 32;
+ } while (aN);
+
+ return b;
+ }
+
+ PointerIdMap mIdMap;
+ uint32_t mNextId;
+
+ // |mIdBuf| must have space for at least eight chars, which is the space
+ // needed to hold 'Dffffff' (including the terminating null char), which is
+ // the base-32 representation of 0xffffffff.
+ static const size_t kIdBufLen = 16;
+ char mIdBuf[kIdBufLen];
+};
+
+// Helper class for converting a pointer value to a string.
+class ToStringConverter {
+ public:
+ const char* ToPtrString(const void* aPtr) {
+ snprintf(kPtrBuf, sizeof(kPtrBuf) - 1, "%" PRIxPTR, (uintptr_t)aPtr);
+ return kPtrBuf;
+ }
+
+ private:
+ char kPtrBuf[32];
+};
+
+static void WriteBlockContents(JSONWriter& aWriter, const LiveBlock& aBlock) {
+ size_t numWords = aBlock.ReqSize() / sizeof(uintptr_t*);
+ if (numWords == 0) {
+ return;
+ }
+
+ aWriter.StartArrayProperty("contents", aWriter.SingleLineStyle);
+ {
+ const uintptr_t** block = (const uintptr_t**)aBlock.Address();
+ ToStringConverter sc;
+ for (size_t i = 0; i < numWords; ++i) {
+ aWriter.StringElement(MakeStringSpan(sc.ToPtrString(block[i])));
+ }
+ }
+ aWriter.EndArray();
+}
+
+static void AnalyzeImpl(UniquePtr<JSONWriteFunc> aWriter) {
+ // Some blocks may have been allocated while creating |aWriter|. Those blocks
+ // will be freed at the end of this function when |write| is destroyed. The
+ // allocations will have occurred while intercepts were not blocked, so the
+ // frees better be as well, otherwise we'll get assertion failures.
+ // Therefore, this declaration must precede the AutoBlockIntercepts
+ // declaration, to ensure that |write| is destroyed *after* intercepts are
+ // unblocked.
+ JSONWriter writer(std::move(aWriter));
+
+ AutoBlockIntercepts block(Thread::Fetch());
+ AutoLockState lock;
+
+ // Allocate this on the heap instead of the stack because it's fairly large.
+ auto locService = InfallibleAllocPolicy::new_<CodeAddressService>();
+
+ StackTraceSet usedStackTraces(512);
+ PointerSet usedPcs(512);
+
+ size_t iscSize;
+
+ static int analysisCount = 1;
+ StatusMsg("Dump %d {\n", analysisCount++);
+
+ writer.Start();
+ {
+ writer.IntProperty("version", kOutputVersionNumber);
+
+ writer.StartObjectProperty("invocation");
+ {
+ const char* var = gOptions->DMDEnvVar();
+ if (var) {
+ writer.StringProperty("dmdEnvVar", MakeStringSpan(var));
+ } else {
+ writer.NullProperty("dmdEnvVar");
+ }
+
+ writer.StringProperty("mode", MakeStringSpan(gOptions->ModeString()));
+ }
+ writer.EndObject();
+
+ StatusMsg(" Constructing the heap block list...\n");
+
+ ToIdStringConverter isc;
+ ToStringConverter sc;
+
+ writer.StartArrayProperty("blockList");
+ {
+ // Lambda that writes out a live block.
+ auto writeLiveBlock = [&](const LiveBlock& aB, size_t aNum) {
+ aB.AddStackTracesToTable(usedStackTraces);
+
+ MOZ_ASSERT_IF(gOptions->IsScanMode(), aNum == 1);
+
+ writer.StartObjectElement(writer.SingleLineStyle);
+ {
+ if (gOptions->IsScanMode()) {
+ writer.StringProperty("addr",
+ MakeStringSpan(sc.ToPtrString(aB.Address())));
+ WriteBlockContents(writer, aB);
+ }
+ writer.IntProperty("req", aB.ReqSize());
+ if (aB.SlopSize() > 0) {
+ writer.IntProperty("slop", aB.SlopSize());
+ }
+
+ if (aB.AllocStackTrace()) {
+ writer.StringProperty(
+ "alloc", MakeStringSpan(isc.ToIdString(aB.AllocStackTrace())));
+ }
+
+ if (gOptions->IsDarkMatterMode() && aB.NumReports() > 0) {
+ writer.StartArrayProperty("reps");
+ {
+ if (aB.ReportStackTrace1()) {
+ writer.StringElement(
+ MakeStringSpan(isc.ToIdString(aB.ReportStackTrace1())));
+ }
+ if (aB.ReportStackTrace2()) {
+ writer.StringElement(
+ MakeStringSpan(isc.ToIdString(aB.ReportStackTrace2())));
+ }
+ }
+ writer.EndArray();
+ }
+
+ if (aNum > 1) {
+ writer.IntProperty("num", aNum);
+ }
+ }
+ writer.EndObject();
+ };
+
+ // Live blocks.
+ if (!gOptions->IsScanMode()) {
+ // At this point we typically have many LiveBlocks that differ only in
+ // their address. Aggregate them to reduce the size of the output file.
+ AggregatedLiveBlockTable agg(8192);
+ for (auto iter = gLiveBlockTable->iter(); !iter.done(); iter.next()) {
+ const LiveBlock& b = iter.get();
+ b.AddStackTracesToTable(usedStackTraces);
+
+ if (AggregatedLiveBlockTable::AddPtr p = agg.lookupForAdd(&b)) {
+ p->value() += 1;
+ } else {
+ MOZ_ALWAYS_TRUE(agg.add(p, &b, 1));
+ }
+ }
+
+ // Now iterate over the aggregated table.
+ for (auto iter = agg.iter(); !iter.done(); iter.next()) {
+ const LiveBlock& b = *iter.get().key();
+ size_t num = iter.get().value();
+ writeLiveBlock(b, num);
+ }
+
+ } else {
+ // In scan mode we cannot aggregate because we print each live block's
+ // address and contents.
+ for (auto iter = gLiveBlockTable->iter(); !iter.done(); iter.next()) {
+ const LiveBlock& b = iter.get();
+ b.AddStackTracesToTable(usedStackTraces);
+
+ writeLiveBlock(b, 1);
+ }
+ }
+
+ // Dead blocks.
+ for (auto iter = gDeadBlockTable->iter(); !iter.done(); iter.next()) {
+ const DeadBlock& b = iter.get().key();
+ b.AddStackTracesToTable(usedStackTraces);
+
+ size_t num = iter.get().value();
+ MOZ_ASSERT(num > 0);
+
+ writer.StartObjectElement(writer.SingleLineStyle);
+ {
+ writer.IntProperty("req", b.ReqSize());
+ if (b.SlopSize() > 0) {
+ writer.IntProperty("slop", b.SlopSize());
+ }
+ if (b.AllocStackTrace()) {
+ writer.StringProperty(
+ "alloc", MakeStringSpan(isc.ToIdString(b.AllocStackTrace())));
+ }
+
+ if (num > 1) {
+ writer.IntProperty("num", num);
+ }
+ }
+ writer.EndObject();
+ }
+ }
+ writer.EndArray();
+
+ StatusMsg(" Constructing the stack trace table...\n");
+
+ writer.StartObjectProperty("traceTable");
+ {
+ for (auto iter = usedStackTraces.iter(); !iter.done(); iter.next()) {
+ const StackTrace* const st = iter.get();
+ writer.StartArrayProperty(MakeStringSpan(isc.ToIdString(st)),
+ writer.SingleLineStyle);
+ {
+ for (uint32_t i = 0; i < st->Length(); i++) {
+ const void* pc = st->Pc(i);
+ writer.StringElement(MakeStringSpan(isc.ToIdString(pc)));
+ MOZ_ALWAYS_TRUE(usedPcs.put(pc));
+ }
+ }
+ writer.EndArray();
+ }
+ }
+ writer.EndObject();
+
+ StatusMsg(" Constructing the stack frame table...\n");
+
+ writer.StartObjectProperty("frameTable");
+ {
+ static const size_t locBufLen = 1024;
+ char locBuf[locBufLen];
+
+ for (auto iter = usedPcs.iter(); !iter.done(); iter.next()) {
+ const void* const pc = iter.get();
+
+ // Use 0 for the frame number. See the JSON format description comment
+ // in DMD.h to understand why.
+ locService->GetLocation(0, pc, locBuf, locBufLen);
+ writer.StringProperty(MakeStringSpan(isc.ToIdString(pc)),
+ MakeStringSpan(locBuf));
+ }
+ }
+ writer.EndObject();
+
+ iscSize = isc.sizeOfExcludingThis(MallocSizeOf);
+ }
+ writer.End();
+
+ if (gOptions->ShowDumpStats()) {
+ Sizes sizes;
+ SizeOfInternal(&sizes);
+
+ static const size_t kBufLen = 64;
+ char buf1[kBufLen];
+ char buf2[kBufLen];
+ char buf3[kBufLen];
+
+ StatusMsg(" Execution measurements {\n");
+
+ StatusMsg(" Data structures that persist after Dump() ends {\n");
+
+ StatusMsg(" Used stack traces: %10s bytes\n",
+ Show(sizes.mStackTracesUsed, buf1, kBufLen));
+
+ StatusMsg(" Unused stack traces: %10s bytes\n",
+ Show(sizes.mStackTracesUnused, buf1, kBufLen));
+
+ StatusMsg(" Stack trace table: %10s bytes (%s entries, %s used)\n",
+ Show(sizes.mStackTraceTable, buf1, kBufLen),
+ Show(gStackTraceTable->capacity(), buf2, kBufLen),
+ Show(gStackTraceTable->count(), buf3, kBufLen));
+
+ StatusMsg(" Live block table: %10s bytes (%s entries, %s used)\n",
+ Show(sizes.mLiveBlockTable, buf1, kBufLen),
+ Show(gLiveBlockTable->capacity(), buf2, kBufLen),
+ Show(gLiveBlockTable->count(), buf3, kBufLen));
+
+ StatusMsg(" Dead block table: %10s bytes (%s entries, %s used)\n",
+ Show(sizes.mDeadBlockTable, buf1, kBufLen),
+ Show(gDeadBlockTable->capacity(), buf2, kBufLen),
+ Show(gDeadBlockTable->count(), buf3, kBufLen));
+
+ StatusMsg(" }\n");
+ StatusMsg(" Data structures that are destroyed after Dump() ends {\n");
+
+ StatusMsg(
+ " Location service: %10s bytes\n",
+ Show(locService->SizeOfIncludingThis(MallocSizeOf), buf1, kBufLen));
+ StatusMsg(" Used stack traces set: %10s bytes\n",
+ Show(usedStackTraces.shallowSizeOfExcludingThis(MallocSizeOf),
+ buf1, kBufLen));
+ StatusMsg(
+ " Used PCs set: %10s bytes\n",
+ Show(usedPcs.shallowSizeOfExcludingThis(MallocSizeOf), buf1, kBufLen));
+ StatusMsg(" Pointer ID map: %10s bytes\n",
+ Show(iscSize, buf1, kBufLen));
+
+ StatusMsg(" }\n");
+ StatusMsg(" Counts {\n");
+
+ size_t hits = locService->NumCacheHits();
+ size_t misses = locService->NumCacheMisses();
+ size_t requests = hits + misses;
+ StatusMsg(" Location service: %10s requests\n",
+ Show(requests, buf1, kBufLen));
+
+ size_t count = locService->CacheCount();
+ size_t capacity = locService->CacheCapacity();
+ StatusMsg(
+ " Location service cache: "
+ "%4.1f%% hit rate, %.1f%% occupancy at end\n",
+ Percent(hits, requests), Percent(count, capacity));
+
+ StatusMsg(" }\n");
+ StatusMsg(" }\n");
+ }
+
+ InfallibleAllocPolicy::delete_(locService);
+
+ StatusMsg("}\n");
+}
+
+void DMDFuncs::Analyze(UniquePtr<JSONWriteFunc> aWriter) {
+ AnalyzeImpl(std::move(aWriter));
+ ClearReports();
+}
+
+//---------------------------------------------------------------------------
+// Testing
+//---------------------------------------------------------------------------
+
+void DMDFuncs::ResetEverything(const char* aOptions) {
+ AutoLockState lock;
+
+ // Reset options.
+ InfallibleAllocPolicy::delete_(gOptions);
+ gOptions = InfallibleAllocPolicy::new_<Options>(aOptions);
+
+ // Clear all existing blocks.
+ gLiveBlockTable->clear();
+ gDeadBlockTable->clear();
+
+ // Reset gBernoulli to a deterministic state. (Its current state depends on
+ // all previous trials.)
+ ResetBernoulli();
+}
+
+} // namespace dmd
+} // namespace mozilla
diff --git a/memory/replace/dmd/DMD.h b/memory/replace/dmd/DMD.h
new file mode 100644
index 0000000000..c057047800
--- /dev/null
+++ b/memory/replace/dmd/DMD.h
@@ -0,0 +1,291 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef DMD_h___
+#define DMD_h___
+
+#include <stdarg.h>
+#include <string.h>
+
+#include <utility>
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Types.h"
+#include "mozilla/UniquePtr.h"
+#include "replace_malloc_bridge.h"
+
+namespace mozilla {
+
+class JSONWriteFunc;
+
+namespace dmd {
+
+struct Sizes {
+ size_t mStackTracesUsed;
+ size_t mStackTracesUnused;
+ size_t mStackTraceTable;
+ size_t mLiveBlockTable;
+ size_t mDeadBlockTable;
+
+ Sizes() { Clear(); }
+ void Clear() { memset(this, 0, sizeof(Sizes)); }
+};
+
+// See further below for a description of each method. The DMDFuncs class
+// should contain a virtual method for each of them (except IsRunning,
+// which can be inferred from the DMDFuncs singleton existing).
+struct DMDFuncs {
+ virtual void Report(const void*);
+
+ virtual void ReportOnAlloc(const void*);
+
+ virtual void ClearReports();
+
+ virtual void Analyze(UniquePtr<JSONWriteFunc>);
+
+ virtual void SizeOf(Sizes*);
+
+ virtual void StatusMsg(const char*, va_list) MOZ_FORMAT_PRINTF(2, 0);
+
+ virtual void ResetEverything(const char*);
+
+#ifndef REPLACE_MALLOC_IMPL
+ // We deliberately don't use ReplaceMalloc::GetDMDFuncs here, because if we
+ // did, the following would happen.
+ // - The code footprint of each call to Get() larger as GetDMDFuncs ends
+ // up inlined.
+ // - When no replace-malloc library is loaded, the number of instructions
+ // executed is equivalent, but don't necessarily fit in the same cache
+ // line.
+ // - When a non-DMD replace-malloc library is loaded, the overhead is
+ // higher because there is first a check for the replace malloc bridge
+ // and then for the DMDFuncs singleton.
+ // Initializing the DMDFuncs singleton on the first access makes the
+ // overhead even worse. Either Get() is inlined and massive, or it isn't
+ // and a simple value check becomes a function call.
+ static DMDFuncs* Get() { return sSingleton.Get(); }
+
+ private:
+ // Wrapper class keeping a pointer to the DMD functions. It is statically
+ // initialized because it needs to be set early enough.
+ // Debug builds also check that it's never accessed before the static
+ // initialization actually occured, which could be the case if some other
+ // static initializer ended up calling into DMD.
+ class Singleton {
+ public:
+ Singleton()
+ : mValue(ReplaceMalloc::GetDMDFuncs())
+# ifdef DEBUG
+ ,
+ mInitialized(true)
+# endif
+ {
+ }
+
+ DMDFuncs* Get() {
+ MOZ_ASSERT(mInitialized);
+ return mValue;
+ }
+
+ private:
+ DMDFuncs* mValue;
+# ifdef DEBUG
+ bool mInitialized;
+# endif
+ };
+
+ // This singleton pointer must be defined on the program side. In Gecko,
+ // this is done in xpcom/base/nsMemoryInfoDumper.cpp.
+ static /* DMDFuncs:: */ Singleton sSingleton;
+#endif
+};
+
+#ifndef REPLACE_MALLOC_IMPL
+// Mark a heap block as reported by a memory reporter.
+inline void Report(const void* aPtr) {
+ DMDFuncs* funcs = DMDFuncs::Get();
+ if (funcs) {
+ funcs->Report(aPtr);
+ }
+}
+
+// Mark a heap block as reported immediately on allocation.
+inline void ReportOnAlloc(const void* aPtr) {
+ DMDFuncs* funcs = DMDFuncs::Get();
+ if (funcs) {
+ funcs->ReportOnAlloc(aPtr);
+ }
+}
+
+// Clears existing reportedness data from any prior runs of the memory
+// reporters. The following sequence should be used.
+// - ClearReports()
+// - run the memory reporters
+// - Analyze()
+// This sequence avoids spurious twice-reported warnings.
+inline void ClearReports() {
+ DMDFuncs* funcs = DMDFuncs::Get();
+ if (funcs) {
+ funcs->ClearReports();
+ }
+}
+
+// Determines which heap blocks have been reported, and dumps JSON output
+// (via |aWriter|) describing the heap.
+//
+// The following sample output contains comments that explain the format and
+// design choices. The output files can be quite large, so a number of
+// decisions were made to minimize size, such as using short property names and
+// omitting properties whenever possible.
+//
+// {
+// // The version number of the format, which will be incremented each time
+// // backwards-incompatible changes are made. A mandatory integer.
+// //
+// // Version history:
+// // - 1: Bug 1044709
+// // - 2: Bug 1094552
+// // - 3: Bug 1100851
+// // - 4: Bug 1121830
+// // - 5: Bug 1253512
+// "version": 5,
+//
+// // Information about how DMD was invoked. A mandatory object.
+// "invocation": {
+// // The contents of the $DMD environment variable. A string, or |null| if
+// // $DMD is undefined.
+// "dmdEnvVar": "--mode=dark-matter",
+//
+// // The profiling mode. A mandatory string taking one of the following
+// // values: "live", "dark-matter", "cumulative", "scan".
+// "mode": "dark-matter",
+// },
+//
+// // Details of all analyzed heap blocks. A mandatory array.
+// "blockList": [
+// // An example of a heap block.
+// {
+// // Requested size, in bytes. This is a mandatory integer.
+// "req": 3584,
+//
+// // Requested slop size, in bytes. This is mandatory if it is non-zero,
+// // but omitted otherwise.
+// "slop": 512,
+//
+// // The stack trace at which the block was allocated. An optional
+// // string that indexes into the "traceTable" object. If omitted, no
+// // allocation stack trace was recorded for the block.
+// "alloc": "A",
+//
+// // One or more stack traces at which this heap block was reported by a
+// // memory reporter. An optional array that will only be present in
+// // "dark-matter" mode. The elements are strings that index into
+// // the "traceTable" object.
+// "reps": ["B"]
+//
+// // The number of heap blocks with exactly the above properties. This
+// // is mandatory if it is greater than one, but omitted otherwise.
+// // (Blocks with identical properties don't have to be aggregated via
+// // this property, but it can greatly reduce output file size.)
+// "num": 5,
+//
+// // The address of the block. This is mandatory in "scan" mode, but
+// // omitted otherwise.
+// "addr": "4e4e4e4e",
+//
+// // The contents of the block, read one word at a time. This is
+// // mandatory in "scan" mode for blocks at least one word long, but
+// // omitted otherwise.
+// "contents": ["0", "6", "7f7f7f7f", "0"]
+// }
+// ],
+//
+// // The stack traces referenced by elements of the "blockList" array. This
+// // could be an array, but making it an object makes it easier to see
+// // which stacks correspond to which references in the "blockList" array.
+// "traceTable": {
+// // Each property corresponds to a stack trace mentioned in the "blocks"
+// // object. Each element is an index into the "frameTable" object.
+// "A": ["D", "E"],
+// "B": ["F", "G"]
+// },
+//
+// // The stack frames referenced by the "traceTable" object. The
+// // descriptions can be quite long, so they are stored separately from the
+// // "traceTable" object so that each one only has to be written once.
+// // This could also be an array, but again, making it an object makes it
+// // easier to see which frames correspond to which references in the
+// // "traceTable" object.
+// "frameTable": {
+// // Each property key is a frame key mentioned in the "traceTable" object.
+// // Each property value is a string containing a frame description. Each
+// // frame description must be in a format recognized by `fix_stacks.py`,
+// // which requires a frame number at the start. Because each stack frame
+// // description in this table can be shared between multiple stack
+// // traces, we use a dummy value of #00. The proper frame number can be
+// // reconstructed later by scripts that output stack traces in a
+// // conventional non-shared format.
+// "D": "#00: foo (Foo.cpp:123)",
+// "E": "#00: bar (Bar.cpp:234)",
+// "F": "#00: baz (Baz.cpp:345)",
+// "G": "#00: quux (Quux.cpp:456)"
+// }
+// }
+//
+// Implementation note: normally, this function wouldn't be templated, but in
+// that case, the function is compiled, which makes the destructor for the
+// UniquePtr fire up, and that needs JSONWriteFunc to be fully defined. That,
+// in turn, requires to include JSONWriter.h, which includes
+// double-conversion.h, which ends up breaking various things built with
+// -Werror for various reasons.
+//
+template <typename JSONWriteFunc>
+inline void Analyze(UniquePtr<JSONWriteFunc> aWriteFunc) {
+ DMDFuncs* funcs = DMDFuncs::Get();
+ if (funcs) {
+ funcs->Analyze(std::move(aWriteFunc));
+ }
+}
+
+// Gets the size of various data structures. Used to implement a memory
+// reporter for DMD.
+inline void SizeOf(Sizes* aSizes) {
+ DMDFuncs* funcs = DMDFuncs::Get();
+ if (funcs) {
+ funcs->SizeOf(aSizes);
+ }
+}
+
+// Prints a status message prefixed with "DMD[<pid>]". Use sparingly.
+MOZ_FORMAT_PRINTF(1, 2)
+inline void StatusMsg(const char* aFmt, ...) {
+ DMDFuncs* funcs = DMDFuncs::Get();
+ if (funcs) {
+ va_list ap;
+ va_start(ap, aFmt);
+ funcs->StatusMsg(aFmt, ap);
+ va_end(ap);
+ }
+}
+
+// Indicates whether or not DMD is running.
+inline bool IsRunning() { return !!DMDFuncs::Get(); }
+
+// Resets all DMD options and then sets new ones according to those specified
+// in |aOptions|. Also clears all recorded data about allocations. Only used
+// for testing purposes.
+inline void ResetEverything(const char* aOptions) {
+ DMDFuncs* funcs = DMDFuncs::Get();
+ if (funcs) {
+ funcs->ResetEverything(aOptions);
+ }
+}
+#endif
+
+} // namespace dmd
+} // namespace mozilla
+
+#endif /* DMD_h___ */
diff --git a/memory/replace/dmd/README b/memory/replace/dmd/README
new file mode 100644
index 0000000000..537893358a
--- /dev/null
+++ b/memory/replace/dmd/README
@@ -0,0 +1,3 @@
+This is DMD. See
+https://firefox-source-docs.mozilla.org/performance/memory/dmd.html for
+details on how to use it.
diff --git a/memory/replace/dmd/block_analyzer.py b/memory/replace/dmd/block_analyzer.py
new file mode 100644
index 0000000000..1f907b38a7
--- /dev/null
+++ b/memory/replace/dmd/block_analyzer.py
@@ -0,0 +1,292 @@
+#!/usr/bin/env python3
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# From a scan mode DMD log, extract some information about a
+# particular block, such as its allocation stack or which other blocks
+# contain pointers to it. This can be useful when investigating leaks
+# caused by unknown references to refcounted objects.
+
+import argparse
+import gzip
+import json
+import re
+import sys
+
+# The DMD output version this script handles.
+outputVersion = 5
+
+# If --ignore-alloc-fns is specified, stack frames containing functions that
+# match these strings will be removed from the *start* of stack traces. (Once
+# we hit a non-matching frame, any subsequent frames won't be removed even if
+# they do match.)
+allocatorFns = [
+ "malloc (",
+ "replace_malloc",
+ "replace_calloc",
+ "replace_realloc",
+ "replace_memalign",
+ "replace_posix_memalign",
+ "malloc_zone_malloc",
+ "moz_xmalloc",
+ "moz_xcalloc",
+ "moz_xrealloc",
+ "operator new(",
+ "operator new[](",
+ "g_malloc",
+ "g_slice_alloc",
+ "callocCanGC",
+ "reallocCanGC",
+ "vpx_malloc",
+ "vpx_calloc",
+ "vpx_realloc",
+ "vpx_memalign",
+ "js_malloc",
+ "js_calloc",
+ "js_realloc",
+ "pod_malloc",
+ "pod_calloc",
+ "pod_realloc",
+ "nsTArrayInfallibleAllocator::Malloc",
+ "Allocator<ReplaceMallocBase>::malloc(",
+ "mozilla::dmd::StackTrace::Get(",
+ "mozilla::dmd::AllocCallback(",
+ "mozilla::dom::DOMArena::Allocate(",
+ # This one necessary to fully filter some sequences of allocation functions
+ # that happen in practice. Note that ??? entries that follow non-allocation
+ # functions won't be stripped, as explained above.
+ "???",
+]
+
+####
+
+# Command line arguments
+
+
+def range_1_24(string):
+ value = int(string)
+ if value < 1 or value > 24:
+ msg = "{:s} is not in the range 1..24".format(string)
+ raise argparse.ArgumentTypeError(msg)
+ return value
+
+
+parser = argparse.ArgumentParser(
+ description="Analyze the heap graph to find out things about an object. \
+By default this prints out information about blocks that point to the given block."
+)
+
+parser.add_argument("dmd_log_file_name", help="clamped DMD log file name")
+
+parser.add_argument("block", help="address of the block of interest")
+
+parser.add_argument(
+ "--info",
+ dest="info",
+ action="store_true",
+ default=False,
+ help="Print out information about the block.",
+)
+
+parser.add_argument(
+ "-sfl",
+ "--max-stack-frame-length",
+ type=int,
+ default=300,
+ help="Maximum number of characters to print from each stack frame",
+)
+
+parser.add_argument(
+ "-a",
+ "--ignore-alloc-fns",
+ action="store_true",
+ help="ignore allocation functions at the start of traces",
+)
+
+parser.add_argument(
+ "-f",
+ "--max-frames",
+ type=range_1_24,
+ default=8,
+ help="maximum number of frames to consider in each trace",
+)
+
+parser.add_argument(
+ "-c",
+ "--chain-reports",
+ action="store_true",
+ help="if only one block is found to hold onto the object, report "
+ "the next one, too",
+)
+
+
+####
+
+
+class BlockData:
+ def __init__(self, json_block):
+ self.addr = json_block["addr"]
+
+ if "contents" in json_block:
+ contents = json_block["contents"]
+ else:
+ contents = []
+ self.contents = []
+ for c in contents:
+ self.contents.append(int(c, 16))
+
+ self.req_size = json_block["req"]
+
+ self.alloc_stack = json_block["alloc"]
+
+
+def print_trace_segment(args, stacks, block):
+ (traceTable, frameTable) = stacks
+
+ for l in traceTable[block.alloc_stack]:
+ # The 5: is to remove the bogus leading "#00: " from the stack frame.
+ print(" " + frameTable[l][5 : args.max_stack_frame_length])
+
+
+def show_referrers(args, blocks, stacks, block):
+ visited = set([])
+
+ anyFound = False
+
+ while True:
+ referrers = {}
+
+ for b, data in blocks.items():
+ which_edge = 0
+ for e in data.contents:
+ if e == block:
+ # 8 is the number of bytes per word on a 64-bit system.
+ # XXX This means that this output will be wrong for logs from 32-bit systems!
+ referrers.setdefault(b, []).append(8 * which_edge)
+ anyFound = True
+ which_edge += 1
+
+ for r in referrers:
+ sys.stdout.write(
+ "0x{} size = {} bytes".format(blocks[r].addr, blocks[r].req_size)
+ )
+ plural = "s" if len(referrers[r]) > 1 else ""
+ print(
+ " at byte offset"
+ + plural
+ + " "
+ + (", ".join(str(x) for x in referrers[r]))
+ )
+ print_trace_segment(args, stacks, blocks[r])
+ print("")
+
+ if args.chain_reports:
+ if len(referrers) == 0:
+ sys.stdout.write("Found no more referrers.\n")
+ break
+ if len(referrers) > 1:
+ sys.stdout.write("Found too many referrers.\n")
+ break
+
+ sys.stdout.write("Chaining to next referrer.\n\n")
+ for r in referrers:
+ block = r
+ if block in visited:
+ sys.stdout.write("Found a loop.\n")
+ break
+ visited.add(block)
+ else:
+ break
+
+ if not anyFound:
+ print("No referrers found.")
+
+
+def show_block_info(args, blocks, stacks, block):
+ b = blocks[block]
+ sys.stdout.write("block: 0x{}\n".format(b.addr))
+ sys.stdout.write("requested size: {} bytes\n".format(b.req_size))
+ sys.stdout.write("\n")
+ sys.stdout.write("block contents: ")
+ for c in b.contents:
+ v = "0" if c == 0 else blocks[c].addr
+ sys.stdout.write("0x{} ".format(v))
+ sys.stdout.write("\n\n")
+ sys.stdout.write("allocation stack:\n")
+ print_trace_segment(args, stacks, b)
+ return
+
+
+def cleanupTraceTable(args, frameTable, traceTable):
+ # Remove allocation functions at the start of traces.
+ if args.ignore_alloc_fns:
+ # Build a regexp that matches every function in allocatorFns.
+ escapedAllocatorFns = map(re.escape, allocatorFns)
+ fn_re = re.compile("|".join(escapedAllocatorFns))
+
+ # Remove allocator fns from each stack trace.
+ for traceKey, frameKeys in traceTable.items():
+ numSkippedFrames = 0
+ for frameKey in frameKeys:
+ frameDesc = frameTable[frameKey]
+ if re.search(fn_re, frameDesc):
+ numSkippedFrames += 1
+ else:
+ break
+ if numSkippedFrames > 0:
+ traceTable[traceKey] = frameKeys[numSkippedFrames:]
+
+ # Trim the number of frames.
+ for traceKey, frameKeys in traceTable.items():
+ if len(frameKeys) > args.max_frames:
+ traceTable[traceKey] = frameKeys[: args.max_frames]
+
+
+def loadGraph(options):
+ # Handle gzipped input if necessary.
+ isZipped = options.dmd_log_file_name.endswith(".gz")
+ opener = gzip.open if isZipped else open
+
+ with opener(options.dmd_log_file_name, "rb") as f:
+ j = json.load(f)
+
+ if j["version"] != outputVersion:
+ raise Exception("'version' property isn't '{:d}'".format(outputVersion))
+
+ block_list = j["blockList"]
+ blocks = {}
+
+ for json_block in block_list:
+ blocks[int(json_block["addr"], 16)] = BlockData(json_block)
+
+ traceTable = j["traceTable"]
+ frameTable = j["frameTable"]
+
+ cleanupTraceTable(options, frameTable, traceTable)
+
+ return (blocks, (traceTable, frameTable))
+
+
+def analyzeLogs():
+ options = parser.parse_args()
+
+ (blocks, stacks) = loadGraph(options)
+
+ block = int(options.block, 16)
+
+ if block not in blocks:
+ print("Object " + options.block + " not found in traces.")
+ print("It could still be the target of some nodes.")
+ return
+
+ if options.info:
+ show_block_info(options, blocks, stacks, block)
+ return
+
+ show_referrers(options, blocks, stacks, block)
+
+
+if __name__ == "__main__":
+ analyzeLogs()
diff --git a/memory/replace/dmd/dmd.py b/memory/replace/dmd/dmd.py
new file mode 100755
index 0000000000..ae772d15ff
--- /dev/null
+++ b/memory/replace/dmd/dmd.py
@@ -0,0 +1,1027 @@
+#! /usr/bin/env python3
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""This script analyzes a JSON file emitted by DMD."""
+
+import argparse
+import collections
+import gzip
+import io
+import json
+import os
+import platform
+import re
+import shutil
+import sys
+import tempfile
+from bisect import bisect_right
+from functools import cmp_to_key
+from typing import Callable
+
+# The DMD output version this script handles.
+outputVersion = 5
+
+# If --ignore-alloc-fns is specified, stack frames containing functions that
+# match these strings will be removed from the *start* of stack traces. (Once
+# we hit a non-matching frame, any subsequent frames won't be removed even if
+# they do match.)
+allocatorFns = [
+ # Matches malloc, replace_malloc, moz_xmalloc, vpx_malloc, js_malloc,
+ # pod_malloc, malloc_zone_*, g_malloc.
+ "malloc",
+ # Matches calloc, replace_calloc, moz_xcalloc, vpx_calloc, js_calloc,
+ # pod_calloc, malloc_zone_calloc, pod_callocCanGC.
+ "calloc",
+ # Matches realloc, replace_realloc, moz_xrealloc, vpx_realloc, js_realloc,
+ # pod_realloc, pod_reallocCanGC.
+ "realloc",
+ # Matches memalign, posix_memalign, replace_memalign, replace_posix_memalign,
+ # moz_xmemalign, vpx_memalign, malloc_zone_memalign.
+ "memalign",
+ "operator new(",
+ "operator new[](",
+ "g_slice_alloc",
+ # This one is necessary to fully filter some sequences of allocation
+ # functions that happen in practice. Note that ??? entries that follow
+ # non-allocation functions won't be stripped, as explained above.
+ "???",
+ # Match DMD internals.
+ "mozilla::dmd::AllocCallback",
+ "mozilla::dmd::StackTrace::Get",
+]
+
+
+def cmp(a, b):
+ return (a > b) - (a < b)
+
+
+class Record(object):
+ """A record is an aggregation of heap blocks that have identical stack
+ traces. It can also be used to represent the difference between two
+ records."""
+
+ def __init__(self):
+ self.numBlocks = 0
+ self.reqSize = 0
+ self.slopSize = 0
+ self.usableSize = 0
+ self.allocatedAtDesc = None
+ self.reportedAtDescs = []
+ self.usableSizes = collections.defaultdict(int)
+
+ def isZero(self, args):
+ return (
+ self.numBlocks == 0
+ and self.reqSize == 0
+ and self.slopSize == 0
+ and self.usableSize == 0
+ and len(self.usableSizes) == 0
+ )
+
+ def negate(self):
+ self.numBlocks = -self.numBlocks
+ self.reqSize = -self.reqSize
+ self.slopSize = -self.slopSize
+ self.usableSize = -self.usableSize
+
+ negatedUsableSizes = collections.defaultdict(int)
+ for usableSize, count in self.usableSizes.items():
+ negatedUsableSizes[-usableSize] = count
+ self.usableSizes = negatedUsableSizes
+
+ def subtract(self, r):
+ # We should only be calling this on records with matching stack traces.
+ # Check this.
+ assert self.allocatedAtDesc == r.allocatedAtDesc
+ assert self.reportedAtDescs == r.reportedAtDescs
+
+ self.numBlocks -= r.numBlocks
+ self.reqSize -= r.reqSize
+ self.slopSize -= r.slopSize
+ self.usableSize -= r.usableSize
+
+ usableSizes1 = self.usableSizes
+ usableSizes2 = r.usableSizes
+ usableSizes3 = collections.defaultdict(int)
+ for usableSize in usableSizes1:
+ counts1 = usableSizes1[usableSize]
+ if usableSize in usableSizes2:
+ counts2 = usableSizes2[usableSize]
+ del usableSizes2[usableSize]
+ counts3 = counts1 - counts2
+ if counts3 != 0:
+ if counts3 < 0:
+ usableSize = -usableSize
+ counts3 = -counts3
+ usableSizes3[usableSize] = counts3
+ else:
+ usableSizes3[usableSize] = counts1
+
+ for usableSize in usableSizes2:
+ usableSizes3[-usableSize] = usableSizes2[usableSize]
+
+ self.usableSizes = usableSizes3
+
+ @staticmethod
+ def cmpByUsableSize(r1, r2):
+ # Sort by usable size, then by req size.
+ return cmp(abs(r1.usableSize), abs(r2.usableSize)) or Record.cmpByReqSize(
+ r1, r2
+ )
+
+ @staticmethod
+ def cmpByReqSize(r1, r2):
+ # Sort by req size.
+ return cmp(abs(r1.reqSize), abs(r2.reqSize))
+
+ @staticmethod
+ def cmpBySlopSize(r1, r2):
+ # Sort by slop size.
+ return cmp(abs(r1.slopSize), abs(r2.slopSize))
+
+ @staticmethod
+ def cmpByNumBlocks(r1, r2):
+ # Sort by block counts, then by usable size.
+ return cmp(abs(r1.numBlocks), abs(r2.numBlocks)) or Record.cmpByUsableSize(
+ r1, r2
+ )
+
+
+sortByChoices = {
+ "usable": Record.cmpByUsableSize, # the default
+ "req": Record.cmpByReqSize,
+ "slop": Record.cmpBySlopSize,
+ "num-blocks": Record.cmpByNumBlocks,
+}
+
+
+def parseCommandLine():
+ # 24 is the maximum number of frames that DMD will produce.
+ def range_1_24(string):
+ value = int(string)
+ if value < 1 or value > 24:
+ msg = "{:s} is not in the range 1..24".format(string)
+ raise argparse.ArgumentTypeError(msg)
+ return value
+
+ description = """
+Analyze heap data produced by DMD.
+If one file is specified, analyze it; if two files are specified, analyze the
+difference.
+Input files can be gzipped.
+Write to stdout unless -o/--output is specified.
+Stack traces are fixed to show function names, filenames and line numbers
+unless --no-fix-stacks is specified; stack fixing modifies the original file
+and may take some time. If specified, the BREAKPAD_SYMBOLS_PATH environment
+variable is used to find breakpad symbols for stack fixing.
+"""
+ p = argparse.ArgumentParser(description=description)
+
+ p.add_argument(
+ "-o",
+ "--output",
+ type=argparse.FileType("w"),
+ help="output file; stdout if unspecified",
+ )
+
+ p.add_argument(
+ "-f",
+ "--max-frames",
+ type=range_1_24,
+ default=8,
+ help="maximum number of frames to consider in each trace",
+ )
+
+ p.add_argument(
+ "-s",
+ "--sort-by",
+ choices=sortByChoices.keys(),
+ default="usable",
+ help="sort the records by a particular metric",
+ )
+
+ p.add_argument(
+ "-a",
+ "--ignore-alloc-fns",
+ action="store_true",
+ help="ignore allocation functions at the start of traces",
+ )
+
+ p.add_argument("--no-fix-stacks", action="store_true", help="do not fix stacks")
+
+ p.add_argument(
+ "--clamp-contents",
+ action="store_true",
+ help="for a scan mode log, clamp addresses to the start of live blocks, "
+ "or zero if not in one",
+ )
+
+ p.add_argument(
+ "--print-clamp-stats",
+ action="store_true",
+ help="print information about the results of pointer clamping; mostly "
+ "useful for debugging clamping",
+ )
+
+ p.add_argument(
+ "--filter-stacks-for-testing",
+ action="store_true",
+ help="filter stack traces; only useful for testing purposes",
+ )
+
+ p.add_argument(
+ "--filter",
+ default=[],
+ action="append",
+ help="Only print entries that have a stack that matches the filter. "
+ "A filter may be negated by prefixing it with `!`. "
+ "If multiple filters are specified, all of them must match.",
+ )
+
+ p.add_argument("input_file", help="a file produced by DMD")
+
+ p.add_argument(
+ "input_file2",
+ nargs="?",
+ help="a file produced by DMD; if present, it is diff'd with input_file",
+ )
+
+ return p.parse_args(sys.argv[1:])
+
+
+# Fix stacks if necessary: first write the output to a tempfile, then replace
+# the original file with it.
+def fixStackTraces(inputFilename, isZipped, opener):
+ # This append() call is needed to make the import statements work when this
+ # script is installed as a symlink.
+ sys.path.append(os.path.dirname(__file__))
+
+ bpsyms = os.environ.get("BREAKPAD_SYMBOLS_PATH", None)
+ sysname = platform.system()
+ if bpsyms and os.path.exists(bpsyms):
+ import fix_stacks as fixModule
+
+ def fix(line):
+ return fixModule.fixSymbols(line, jsonMode=True, breakpadSymsDir=bpsyms)
+
+ elif sysname in ("Linux", "Darwin", "Windows"):
+ import fix_stacks as fixModule
+
+ def fix(line):
+ return fixModule.fixSymbols(line, jsonMode=True)
+
+ else:
+ return
+
+ # Fix stacks, writing output to a temporary file, and then overwrite the
+ # original file.
+ tmpFile = tempfile.NamedTemporaryFile(delete=False)
+
+ # If the input is gzipped, then the output (written initially to |tmpFile|)
+ # should be gzipped as well.
+ #
+ # And we want to set its pre-gzipped filename to '' rather than the name of
+ # the temporary file, so that programs like the Unix 'file' utility don't
+ # say that it was called 'tmp6ozTxE' (or something like that) before it was
+ # zipped. So that explains the |filename=''| parameter.
+ #
+ # But setting the filename like that clobbers |tmpFile.name|, so we must
+ # get that now in order to move |tmpFile| at the end.
+ tmpFilename = tmpFile.name
+ if isZipped:
+ tmpFile = gzip.GzipFile(filename="", fileobj=tmpFile, mode="wb")
+
+ with opener(inputFilename, "rb") as inputFile:
+ for line in inputFile:
+ tmpFile.write(fix(line))
+
+ tmpFile.close()
+
+ shutil.move(tmpFilename, inputFilename)
+
+
+def getDigestFromFile(args, inputFile):
+ # Handle gzipped input if necessary.
+ isZipped = inputFile.endswith(".gz")
+ opener = gzip.open if isZipped else open
+
+ # Fix stack traces unless otherwise instructed.
+ if not args.no_fix_stacks:
+ fixStackTraces(inputFile, isZipped, opener)
+
+ if args.clamp_contents:
+ clampBlockList(args, inputFile, isZipped, opener)
+
+ with opener(inputFile, "rb") as f:
+ j = json.load(f)
+
+ if j["version"] != outputVersion:
+ raise Exception("'version' property isn't '{:d}'".format(outputVersion))
+
+ # Extract the main parts of the JSON object.
+ invocation = j["invocation"]
+ dmdEnvVar = invocation["dmdEnvVar"]
+ mode = invocation["mode"]
+ blockList = j["blockList"]
+ traceTable = j["traceTable"]
+ frameTable = j["frameTable"]
+
+ # Insert the necessary entries for unrecorded stack traces. Note that 'ut'
+ # and 'uf' will not overlap with any keys produced by DMD's
+ # ToIdStringConverter::Base32() function.
+ unrecordedTraceID = "ut"
+ unrecordedFrameID = "uf"
+ traceTable[unrecordedTraceID] = [unrecordedFrameID]
+ frameTable[
+ unrecordedFrameID
+ ] = "#00: (no stack trace recorded due to --stacks=partial)"
+
+ # For the purposes of this script, 'scan' behaves like 'live'.
+ if mode == "scan":
+ mode = "live"
+
+ if mode not in ["live", "dark-matter", "cumulative"]:
+ raise Exception("bad 'mode' property: '{:s}'".format(mode))
+
+ # Remove allocation functions at the start of traces.
+ if args.ignore_alloc_fns:
+ # Build a regexp that matches every function in allocatorFns.
+ escapedAllocatorFns = map(re.escape, allocatorFns)
+ fn_re = re.compile("|".join(escapedAllocatorFns))
+
+ # Remove allocator fns from each stack trace.
+ for traceKey, frameKeys in traceTable.items():
+ numSkippedFrames = 0
+ for frameKey in frameKeys:
+ frameDesc = frameTable[frameKey]
+ if re.search(fn_re, frameDesc):
+ numSkippedFrames += 1
+ else:
+ break
+ if numSkippedFrames > 0:
+ traceTable[traceKey] = frameKeys[numSkippedFrames:]
+
+ # Trim the number of frames.
+ for traceKey, frameKeys in traceTable.items():
+ if len(frameKeys) > args.max_frames:
+ del frameKeys[args.max_frames :]
+
+ def buildTraceDescription(traceTable, frameTable, traceKey):
+ frameKeys = traceTable[traceKey]
+ fmt = " #{:02d}{:}"
+
+ if args.filter_stacks_for_testing:
+ # This option is used by `test_dmd.js`, which runs the code in
+ # `SmokeDMD.cpp`. When running that test, there is too much
+ # variation in the stack traces across different machines and
+ # platforms to do exact output matching. However, every stack trace
+ # should have at least three frames that contain `DMD` (in one of
+ # `DMD.cpp`, `SmokeDMD.cpp`, `SmokeDMD`, or `SmokeDMD.exe`). Some
+ # example frames from automation (where `..` indicates excised path
+ # segments):
+ #
+ # Linux debug, with stack fixing using breakpad syms:
+ # `#01: replace_realloc(void*, unsigned long) [../dmd/DMD.cpp:1110]`
+ #
+ # Linux opt, with native stack fixing:
+ # `#02: TestFull(char const*, int, char const*, int) (../dmd/test/SmokeDMD.cpp:165)`
+ #
+ # Mac opt, with native stack fixing:
+ # `#03: RunTests() (../build/tests/bin/SmokeDMD + 0x21f9)`
+ #
+ # Windows opt, with native stack fixing failing due to a missing PDB:
+ # `#04: ??? (..\\build\\tests\\bin\\SmokeDMD.exe + 0x1c58)`
+ #
+ # If we see three such frames, we replace the entire stack trace
+ # with a single, predictable frame. This imprecise matching will at
+ # least detect if stack fixing fails completely.
+ dmd_frame_matches = 0
+ for frameKey in frameKeys:
+ frameDesc = frameTable[frameKey]
+ if "DMD" in frameDesc:
+ dmd_frame_matches += 1
+ if dmd_frame_matches >= 3:
+ return [fmt.format(1, ": ... DMD.cpp ...")]
+
+ # The frame number is always '#00' (see DMD.h for why), so we have to
+ # replace that with the correct frame number.
+ desc = []
+ for n, frameKey in enumerate(traceTable[traceKey], start=1):
+ desc.append(fmt.format(n, frameTable[frameKey][3:]))
+ return desc
+
+ # Aggregate blocks into records. All sufficiently similar blocks go into a
+ # single record.
+
+ if mode in ["live", "cumulative"]:
+ liveOrCumulativeRecords = collections.defaultdict(Record)
+ elif mode == "dark-matter":
+ unreportedRecords = collections.defaultdict(Record)
+ onceReportedRecords = collections.defaultdict(Record)
+ twiceReportedRecords = collections.defaultdict(Record)
+
+ heapUsableSize = 0
+ heapBlocks = 0
+
+ recordKeyPartCache = {}
+
+ for block in blockList:
+ # For each block we compute a |recordKey|, and all blocks with the same
+ # |recordKey| are aggregated into a single record. The |recordKey| is
+ # derived from the block's 'alloc' and 'reps' (if present) stack
+ # traces.
+ #
+ # We use frame descriptions (e.g. "#00: foo (X.cpp:99)") when comparing
+ # traces for equality. We can't use trace keys or frame keys because
+ # they're not comparable across different DMD runs (which is relevant
+ # when doing diffs).
+ #
+ # Using frame descriptions also fits in with the stack trimming done
+ # for --max-frames, which requires that stack traces with common
+ # beginnings but different endings to be considered equivalent. E.g. if
+ # we have distinct traces T1:[A:D1,B:D2,C:D3] and T2:[X:D1,Y:D2,Z:D4]
+ # and we trim the final frame of each they should be considered
+ # equivalent because the untrimmed frame descriptions (D1 and D2)
+ # match.
+ #
+ # Having said all that, during a single invocation of dmd.py on a
+ # single DMD file, for a single frameKey value the record key will
+ # always be the same, and we might encounter it 1000s of times. So we
+ # cache prior results for speed.
+ def makeRecordKeyPart(traceKey):
+ if traceKey in recordKeyPartCache:
+ return recordKeyPartCache[traceKey]
+
+ recordKeyPart = str(
+ list(map(lambda frameKey: frameTable[frameKey], traceTable[traceKey]))
+ )
+ recordKeyPartCache[traceKey] = recordKeyPart
+ return recordKeyPart
+
+ allocatedAtTraceKey = block.get("alloc", unrecordedTraceID)
+ if mode in ["live", "cumulative"]:
+ recordKey = makeRecordKeyPart(allocatedAtTraceKey)
+ records = liveOrCumulativeRecords
+ elif mode == "dark-matter":
+ recordKey = makeRecordKeyPart(allocatedAtTraceKey)
+ if "reps" in block:
+ reportedAtTraceKeys = block["reps"]
+ for reportedAtTraceKey in reportedAtTraceKeys:
+ recordKey += makeRecordKeyPart(reportedAtTraceKey)
+ if len(reportedAtTraceKeys) == 1:
+ records = onceReportedRecords
+ else:
+ records = twiceReportedRecords
+ else:
+ records = unreportedRecords
+
+ record = records[recordKey]
+
+ if "req" not in block:
+ raise Exception("'req' property missing in block'")
+
+ reqSize = block["req"]
+ slopSize = block.get("slop", 0)
+
+ if "num" in block:
+ num = block["num"]
+ else:
+ num = 1
+
+ usableSize = reqSize + slopSize
+ heapUsableSize += num * usableSize
+ heapBlocks += num
+
+ record.numBlocks += num
+ record.reqSize += num * reqSize
+ record.slopSize += num * slopSize
+ record.usableSize += num * usableSize
+ if record.allocatedAtDesc is None:
+ record.allocatedAtDesc = buildTraceDescription(
+ traceTable, frameTable, allocatedAtTraceKey
+ )
+
+ if mode in ["live", "cumulative"]:
+ pass
+ elif mode == "dark-matter":
+ if "reps" in block and record.reportedAtDescs == []:
+
+ def f(k):
+ return buildTraceDescription(traceTable, frameTable, k)
+
+ record.reportedAtDescs = list(map(f, reportedAtTraceKeys))
+ record.usableSizes[usableSize] += num
+
+ # All the processed data for a single DMD file is called a "digest".
+ digest = {}
+ digest["dmdEnvVar"] = dmdEnvVar
+ digest["mode"] = mode
+ digest["heapUsableSize"] = heapUsableSize
+ digest["heapBlocks"] = heapBlocks
+ if mode in ["live", "cumulative"]:
+ digest["liveOrCumulativeRecords"] = liveOrCumulativeRecords
+ elif mode == "dark-matter":
+ digest["unreportedRecords"] = unreportedRecords
+ digest["onceReportedRecords"] = onceReportedRecords
+ digest["twiceReportedRecords"] = twiceReportedRecords
+ return digest
+
+
+def diffRecords(args, records1, records2):
+ records3 = {}
+
+ # Process records1.
+ for k in records1:
+ r1 = records1[k]
+ if k in records2:
+ # This record is present in both records1 and records2.
+ r2 = records2[k]
+ del records2[k]
+ r2.subtract(r1)
+ if not r2.isZero(args):
+ records3[k] = r2
+ else:
+ # This record is present only in records1.
+ r1.negate()
+ records3[k] = r1
+
+ for k in records2:
+ # This record is present only in records2.
+ records3[k] = records2[k]
+
+ return records3
+
+
+def diffDigests(args, d1, d2):
+ if d1["mode"] != d2["mode"]:
+ raise Exception("the input files have different 'mode' properties")
+
+ d3 = {}
+ d3["dmdEnvVar"] = (d1["dmdEnvVar"], d2["dmdEnvVar"])
+ d3["mode"] = d1["mode"]
+ d3["heapUsableSize"] = d2["heapUsableSize"] - d1["heapUsableSize"]
+ d3["heapBlocks"] = d2["heapBlocks"] - d1["heapBlocks"]
+ if d1["mode"] in ["live", "cumulative"]:
+ d3["liveOrCumulativeRecords"] = diffRecords(
+ args, d1["liveOrCumulativeRecords"], d2["liveOrCumulativeRecords"]
+ )
+ elif d1["mode"] == "dark-matter":
+ d3["unreportedRecords"] = diffRecords(
+ args, d1["unreportedRecords"], d2["unreportedRecords"]
+ )
+ d3["onceReportedRecords"] = diffRecords(
+ args, d1["onceReportedRecords"], d2["onceReportedRecords"]
+ )
+ d3["twiceReportedRecords"] = diffRecords(
+ args, d1["twiceReportedRecords"], d2["twiceReportedRecords"]
+ )
+ return d3
+
+
+def printDigest(args, digest):
+ dmdEnvVar = digest["dmdEnvVar"]
+ mode = digest["mode"]
+ heapUsableSize = digest["heapUsableSize"]
+ heapBlocks = digest["heapBlocks"]
+ if mode in ["live", "cumulative"]:
+ liveOrCumulativeRecords = digest["liveOrCumulativeRecords"]
+ elif mode == "dark-matter":
+ unreportedRecords = digest["unreportedRecords"]
+ onceReportedRecords = digest["onceReportedRecords"]
+ twiceReportedRecords = digest["twiceReportedRecords"]
+
+ separator = "#" + "-" * 65 + "\n"
+
+ def number(n):
+ """Format a number with comma as a separator."""
+ return "{:,d}".format(n)
+
+ def perc(m, n):
+ return 0 if n == 0 else (100 * m / n)
+
+ def plural(n):
+ return "" if n == 1 else "s"
+
+ # Prints to stdout, or to file if -o/--output was specified.
+ def out(*arguments, **kwargs):
+ print(*arguments, file=args.output, **kwargs)
+
+ def printStack(traceDesc):
+ for frameDesc in traceDesc:
+ out(frameDesc)
+
+ def printRecords(recordKind, records, heapUsableSize):
+ RecordKind = recordKind.capitalize()
+ out(separator)
+ numRecords = len(records)
+ cmpRecords = sortByChoices[args.sort_by]
+ sortedRecords = sorted(
+ records.values(), key=cmp_to_key(cmpRecords), reverse=True
+ )
+ kindBlocks = 0
+ kindUsableSize = 0
+ maxRecord = 1000
+
+ def is_match(rec: Record, key: str):
+ return any(key in desc for desc in rec.allocatedAtDesc)
+
+ for arg in args.filter:
+ key: str
+ cond: Callable[[Record], bool]
+ if arg.startswith("\\"):
+ # just in case you really need to start a filter with '!' (or '\')
+ key = arg[1:]
+ cond = is_match
+ elif arg.startswith("!"):
+ key = arg[1:]
+
+ def cond(rec, key):
+ return not is_match(rec, key) # noqa: E731
+
+ else:
+ key = arg
+ cond = is_match
+ sortedRecords = [rec for rec in sortedRecords if cond(rec, key)]
+
+ # First iteration: get totals, etc.
+ for record in sortedRecords:
+ kindBlocks += record.numBlocks
+ kindUsableSize += record.usableSize
+
+ # Second iteration: print.
+ if numRecords == 0:
+ out("# no {:} heap blocks\n".format(recordKind))
+
+ kindCumulativeUsableSize = 0
+ for i, record in enumerate(sortedRecords, start=1):
+ # Stop printing at the |maxRecord|th record.
+ if i == maxRecord:
+ out(
+ "# {:}: stopping after {:,d} heap block records\n".format(
+ RecordKind, i
+ )
+ )
+ break
+
+ kindCumulativeUsableSize += record.usableSize
+
+ out(RecordKind + " {")
+ out(
+ " {:} block{:} in heap block record {:,d} of {:,d}".format(
+ number(record.numBlocks), plural(record.numBlocks), i, numRecords
+ )
+ )
+ out(
+ " {:} bytes ({:} requested / {:} slop)".format(
+ number(record.usableSize),
+ number(record.reqSize),
+ number(record.slopSize),
+ )
+ )
+
+ usableSizes = sorted(
+ record.usableSizes.items(), key=lambda x: abs(x[0]), reverse=True
+ )
+ hasSingleBlock = len(usableSizes) == 1 and usableSizes[0][1] == 1
+
+ if not hasSingleBlock:
+ out(" Individual block sizes: ", end="")
+ if len(usableSizes) == 0:
+ out("(no change)", end="")
+ else:
+ isFirst = True
+ for usableSize, count in usableSizes:
+ if not isFirst:
+ out("; ", end="")
+ out("{:}".format(number(usableSize)), end="")
+ if count > 1:
+ out(" x {:,d}".format(count), end="")
+ isFirst = False
+ out()
+
+ out(
+ " {:4.2f}% of the heap ({:4.2f}% cumulative)".format(
+ perc(record.usableSize, heapUsableSize),
+ perc(kindCumulativeUsableSize, heapUsableSize),
+ )
+ )
+ if mode in ["live", "cumulative"]:
+ pass
+ elif mode == "dark-matter":
+ out(
+ " {:4.2f}% of {:} ({:4.2f}% cumulative)".format(
+ perc(record.usableSize, kindUsableSize),
+ recordKind,
+ perc(kindCumulativeUsableSize, kindUsableSize),
+ )
+ )
+ out(" Allocated at {")
+ printStack(record.allocatedAtDesc)
+ out(" }")
+ if mode in ["live", "cumulative"]:
+ pass
+ elif mode == "dark-matter":
+ for n, reportedAtDesc in enumerate(record.reportedAtDescs):
+ again = "again " if n > 0 else ""
+ out(" Reported {:}at {{".format(again))
+ printStack(reportedAtDesc)
+ out(" }")
+ out("}\n")
+
+ return (kindUsableSize, kindBlocks)
+
+ def printInvocation(n, dmdEnvVar, mode):
+ out("Invocation{:} {{".format(n))
+ if dmdEnvVar is None:
+ out(" $DMD is undefined")
+ else:
+ out(" $DMD = '" + dmdEnvVar + "'")
+ out(" Mode = '" + mode + "'")
+ out("}\n")
+
+ # Print command line. Strip dirs so the output is deterministic, which is
+ # needed for testing.
+ out(separator, end="")
+ out("# " + " ".join(map(os.path.basename, sys.argv)) + "\n")
+
+ # Print invocation(s).
+ if type(dmdEnvVar) is not tuple:
+ printInvocation("", dmdEnvVar, mode)
+ else:
+ printInvocation(" 1", dmdEnvVar[0], mode)
+ printInvocation(" 2", dmdEnvVar[1], mode)
+
+ # Print records.
+ if mode in ["live", "cumulative"]:
+ liveOrCumulativeUsableSize, liveOrCumulativeBlocks = printRecords(
+ mode, liveOrCumulativeRecords, heapUsableSize
+ )
+ elif mode == "dark-matter":
+ twiceReportedUsableSize, twiceReportedBlocks = printRecords(
+ "twice-reported", twiceReportedRecords, heapUsableSize
+ )
+
+ unreportedUsableSize, unreportedBlocks = printRecords(
+ "unreported", unreportedRecords, heapUsableSize
+ )
+
+ onceReportedUsableSize, onceReportedBlocks = printRecords(
+ "once-reported", onceReportedRecords, heapUsableSize
+ )
+
+ # Print summary.
+ out(separator)
+ out("Summary {")
+ if mode in ["live", "cumulative"]:
+ out(
+ " Total: {:} bytes in {:} blocks".format(
+ number(liveOrCumulativeUsableSize), number(liveOrCumulativeBlocks)
+ )
+ )
+ elif mode == "dark-matter":
+ fmt = " {:15} {:>12} bytes ({:6.2f}%) in {:>7} blocks ({:6.2f}%)"
+ out(fmt.format("Total:", number(heapUsableSize), 100, number(heapBlocks), 100))
+ out(
+ fmt.format(
+ "Unreported:",
+ number(unreportedUsableSize),
+ perc(unreportedUsableSize, heapUsableSize),
+ number(unreportedBlocks),
+ perc(unreportedBlocks, heapBlocks),
+ )
+ )
+ out(
+ fmt.format(
+ "Once-reported:",
+ number(onceReportedUsableSize),
+ perc(onceReportedUsableSize, heapUsableSize),
+ number(onceReportedBlocks),
+ perc(onceReportedBlocks, heapBlocks),
+ )
+ )
+ out(
+ fmt.format(
+ "Twice-reported:",
+ number(twiceReportedUsableSize),
+ perc(twiceReportedUsableSize, heapUsableSize),
+ number(twiceReportedBlocks),
+ perc(twiceReportedBlocks, heapBlocks),
+ )
+ )
+ out("}\n")
+
+
+#############################
+# Pretty printer for DMD JSON
+#############################
+
+
+def prettyPrintDmdJson(out, j):
+ out.write("{\n")
+
+ out.write(' "version": {0},\n'.format(j["version"]))
+ out.write(' "invocation": ')
+ json.dump(j["invocation"], out, sort_keys=True)
+ out.write(",\n")
+
+ out.write(' "blockList": [')
+ first = True
+ for b in j["blockList"]:
+ out.write("" if first else ",")
+ out.write("\n ")
+ json.dump(b, out, sort_keys=True)
+ first = False
+ out.write("\n ],\n")
+
+ out.write(' "traceTable": {')
+ first = True
+ for k, l in j["traceTable"].items():
+ out.write("" if first else ",")
+ out.write('\n "{0}": {1}'.format(k, json.dumps(l)))
+ first = False
+ out.write("\n },\n")
+
+ out.write(' "frameTable": {')
+ first = True
+ for k, v in j["frameTable"].items():
+ out.write("" if first else ",")
+ out.write('\n "{0}": {1}'.format(k, json.dumps(v)))
+ first = False
+ out.write("\n }\n")
+
+ out.write("}\n")
+
+
+##################################################################
+# Code for clamping addresses using conservative pointer analysis.
+##################################################################
+
+# Start is the address of the first byte of the block, while end is
+# the address of the first byte after the final byte in the block.
+class AddrRange:
+ def __init__(self, block, length):
+ self.block = block
+ self.start = int(block, 16)
+ self.length = length
+ self.end = self.start + self.length
+
+ assert self.start > 0
+ assert length >= 0
+
+
+class ClampStats:
+ def __init__(self):
+ # Number of pointers already pointing to the start of a block.
+ self.startBlockPtr = 0
+
+ # Number of pointers pointing to the middle of a block. These
+ # are clamped to the start of the block they point into.
+ self.midBlockPtr = 0
+
+ # Number of null pointers.
+ self.nullPtr = 0
+
+ # Number of non-null pointers that didn't point into the middle
+ # of any blocks. These are clamped to null.
+ self.nonNullNonBlockPtr = 0
+
+ def clampedBlockAddr(self, sameAddress):
+ if sameAddress:
+ self.startBlockPtr += 1
+ else:
+ self.midBlockPtr += 1
+
+ def nullAddr(self):
+ self.nullPtr += 1
+
+ def clampedNonBlockAddr(self):
+ self.nonNullNonBlockPtr += 1
+
+ def log(self):
+ sys.stderr.write("Results:\n")
+ sys.stderr.write(
+ " Number of pointers already pointing to start of blocks: "
+ + str(self.startBlockPtr)
+ + "\n"
+ )
+ sys.stderr.write(
+ " Number of pointers clamped to start of blocks: "
+ + str(self.midBlockPtr)
+ + "\n"
+ )
+ sys.stderr.write(
+ " Number of non-null pointers not pointing into blocks "
+ "clamped to null: " + str(self.nonNullNonBlockPtr) + "\n"
+ )
+ sys.stderr.write(" Number of null pointers: " + str(self.nullPtr) + "\n")
+
+
+# Search the block ranges array for a block that address points into.
+# The search is carried out in an array of starting addresses for each blocks
+# because it is faster.
+def clampAddress(blockRanges, blockStarts, clampStats, address):
+ i = bisect_right(blockStarts, address)
+
+ # Any addresses completely out of the range should have been eliminated already.
+ assert i > 0
+ r = blockRanges[i - 1]
+ assert r.start <= address
+
+ if address >= r.end:
+ assert address < blockRanges[i].start
+ clampStats.clampedNonBlockAddr()
+ return "0"
+
+ clampStats.clampedBlockAddr(r.start == address)
+ return r.block
+
+
+def clampBlockList(args, inputFileName, isZipped, opener):
+ # XXX This isn't very efficient because we end up reading and writing
+ # the file multiple times.
+ with opener(inputFileName, "rb") as f:
+ j = json.load(f)
+
+ if j["version"] != outputVersion:
+ raise Exception("'version' property isn't '{:d}'".format(outputVersion))
+
+ # Check that the invocation is reasonable for contents clamping.
+ invocation = j["invocation"]
+ if invocation["mode"] != "scan":
+ raise Exception("Log was taken in mode " + invocation["mode"] + " not scan")
+
+ sys.stderr.write("Creating block range list.\n")
+ blockList = j["blockList"]
+ blockRanges = []
+ for block in blockList:
+ blockRanges.append(AddrRange(block["addr"], block["req"]))
+ blockRanges.sort(key=lambda r: r.start)
+
+ # Make sure there are no overlapping blocks.
+ prevRange = blockRanges[0]
+ for currRange in blockRanges[1:]:
+ assert prevRange.end <= currRange.start
+ prevRange = currRange
+
+ sys.stderr.write("Clamping block contents.\n")
+ clampStats = ClampStats()
+ firstAddr = blockRanges[0].start
+ lastAddr = blockRanges[-1].end
+
+ blockStarts = []
+ for r in blockRanges:
+ blockStarts.append(r.start)
+
+ for block in blockList:
+ # Small blocks don't have any contents.
+ if "contents" not in block:
+ continue
+
+ cont = block["contents"]
+ for i in range(len(cont)):
+ address = int(cont[i], 16)
+
+ if address == 0:
+ clampStats.nullAddr()
+ continue
+
+ # If the address is before the first block or after the last
+ # block then it can't be within a block.
+ if address < firstAddr or address >= lastAddr:
+ clampStats.clampedNonBlockAddr()
+ cont[i] = "0"
+ continue
+
+ cont[i] = clampAddress(blockRanges, blockStarts, clampStats, address)
+
+ # Remove any trailing nulls.
+ while len(cont) and cont[-1] == "0":
+ cont.pop()
+
+ if args.print_clamp_stats:
+ clampStats.log()
+
+ sys.stderr.write("Saving file.\n")
+ tmpFile = tempfile.NamedTemporaryFile(delete=False)
+ tmpFilename = tmpFile.name
+ if isZipped:
+ tmpFile = gzip.GzipFile(filename="", fileobj=tmpFile, mode="wb")
+ prettyPrintDmdJson(io.TextIOWrapper(tmpFile, encoding="utf-8"), j)
+ tmpFile.close()
+ shutil.move(tmpFilename, inputFileName)
+
+
+def main():
+ args = parseCommandLine()
+ digest = getDigestFromFile(args, args.input_file)
+ if args.input_file2:
+ digest2 = getDigestFromFile(args, args.input_file2)
+ digest = diffDigests(args, digest, digest2)
+ printDigest(args, digest)
+
+
+if __name__ == "__main__":
+ main()
diff --git a/memory/replace/dmd/moz.build b/memory/replace/dmd/moz.build
new file mode 100644
index 0000000000..6f3121df48
--- /dev/null
+++ b/memory/replace/dmd/moz.build
@@ -0,0 +1,37 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS += [
+ "DMD.h",
+]
+
+UNIFIED_SOURCES += [
+ "DMD.cpp",
+]
+
+if not CONFIG["MOZ_REPLACE_MALLOC_STATIC"]:
+ UNIFIED_SOURCES += [
+ "/mfbt/HashFunctions.cpp",
+ "/mfbt/JSONWriter.cpp",
+ "/mfbt/Poison.cpp",
+ "/mozglue/misc/StackWalk.cpp",
+ ]
+ if CONFIG["OS_ARCH"] == "WINNT":
+ OS_LIBS += [
+ "dbghelp",
+ ]
+
+ReplaceMalloc("dmd")
+
+DEFINES["MOZ_NO_MOZALLOC"] = True
+DEFINES["IMPL_MFBT"] = True
+
+if CONFIG["MOZ_OPTIMIZE"]:
+ DEFINES["MOZ_OPTIMIZE"] = True
+
+DisableStlWrapping()
+
+TEST_DIRS += ["test"]
diff --git a/memory/replace/dmd/test/SmokeDMD.cpp b/memory/replace/dmd/test/SmokeDMD.cpp
new file mode 100644
index 0000000000..c72e92a543
--- /dev/null
+++ b/memory/replace/dmd/test/SmokeDMD.cpp
@@ -0,0 +1,378 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This program is used by the DMD xpcshell test. It is run under DMD and
+// produces some output. The xpcshell test then post-processes and checks this
+// output.
+//
+// Note that this file does not have "Test" or "test" in its name, because that
+// will cause the build system to not record breakpad symbols for it, which
+// will stop the post-processing (which includes stack fixing) from working
+// correctly.
+
+// This is required on some systems such as Fedora to allow
+// building with -O0 together with --warnings-as-errors due to
+// a check in /usr/include/features.h
+#undef _FORTIFY_SOURCE
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/JSONWriter.h"
+#include "mozilla/Sprintf.h"
+#include "mozilla/UniquePtr.h"
+#include "DMD.h"
+
+using mozilla::MakeUnique;
+using namespace mozilla::dmd;
+
+DMDFuncs::Singleton DMDFuncs::sSingleton;
+
+class FpWriteFunc final : public mozilla::JSONWriteFunc {
+ public:
+ explicit FpWriteFunc(const char* aFilename) {
+ mFp = fopen(aFilename, "w");
+ if (!mFp) {
+ fprintf(stderr, "SmokeDMD: can't create %s file: %s\n", aFilename,
+ strerror(errno));
+ exit(1);
+ }
+ }
+
+ ~FpWriteFunc() { fclose(mFp); }
+
+ void Write(const mozilla::Span<const char>& aStr) final {
+ for (const char c : aStr) {
+ fputc(c, mFp);
+ }
+ }
+
+ private:
+ FILE* mFp;
+};
+
+// This stops otherwise-unused variables from being optimized away.
+static void UseItOrLoseIt(void* aPtr, int aSeven) {
+ char buf[64];
+ int n = SprintfLiteral(buf, "%p\n", aPtr);
+ if (n == 20 + aSeven) {
+ fprintf(stderr, "well, that is surprising");
+ }
+}
+
+// This function checks that heap blocks that have the same stack trace but
+// different (or no) reporters get aggregated separately.
+void Foo(int aSeven) {
+ char* a[6];
+ for (int i = 0; i < aSeven - 1; i++) {
+ a[i] = (char*)malloc(128 - 16 * i);
+ UseItOrLoseIt(a[i], aSeven);
+ }
+
+ // Oddly, some versions of clang will cause identical stack traces to be
+ // generated for adjacent calls to Report(), which breaks the test. Inserting
+ // the UseItOrLoseIt() calls in between is enough to prevent this.
+
+ Report(a[2]); // reported
+
+ UseItOrLoseIt(a[2], aSeven);
+
+ for (int i = 0; i < aSeven - 5; i++) {
+ Report(a[i]); // reported
+ UseItOrLoseIt(a[i], aSeven);
+ }
+
+ UseItOrLoseIt(a[2], aSeven);
+
+ Report(a[3]); // reported
+
+ // a[4], a[5] unreported
+}
+
+void TestEmpty(const char* aTestName, const char* aMode) {
+ char filename[128];
+ SprintfLiteral(filename, "complete-%s-%s.json", aTestName, aMode);
+ auto f = MakeUnique<FpWriteFunc>(filename);
+
+ char options[128];
+ SprintfLiteral(options, "--mode=%s --stacks=full", aMode);
+ ResetEverything(options);
+
+ // Zero for everything.
+ Analyze(std::move(f));
+}
+
+void TestFull(const char* aTestName, int aNum, const char* aMode, int aSeven) {
+ char filename[128];
+ SprintfLiteral(filename, "complete-%s%d-%s.json", aTestName, aNum, aMode);
+ auto f = MakeUnique<FpWriteFunc>(filename);
+
+ // The --show-dump-stats=yes is there just to give that option some basic
+ // testing, e.g. ensure it doesn't crash. It's hard to test much beyond that.
+ char options[128];
+ SprintfLiteral(options, "--mode=%s --stacks=full --show-dump-stats=yes",
+ aMode);
+ ResetEverything(options);
+
+ // Analyze 1: 1 freed, 9 out of 10 unreported.
+ // Analyze 2: still present and unreported.
+ int i;
+ char* a = nullptr;
+ for (i = 0; i < aSeven + 3; i++) {
+ a = (char*)malloc(100);
+ UseItOrLoseIt(a, aSeven);
+ }
+ free(a);
+
+ // A no-op.
+ free(nullptr);
+
+ // Note: 16 bytes is the smallest requested size that gives consistent
+ // behaviour across all platforms with jemalloc.
+ // Analyze 1: reported.
+ // Analyze 2: thrice-reported.
+ char* a2 = (char*)malloc(16);
+ Report(a2);
+
+ // Analyze 1: reported.
+ // Analyze 2: reportedness carries over, due to ReportOnAlloc.
+ char* b = (char*)malloc(10);
+ ReportOnAlloc(b);
+
+ // ReportOnAlloc, then freed.
+ // Analyze 1: freed, irrelevant.
+ // Analyze 2: freed, irrelevant.
+ char* b2 = (char*)malloc(16);
+ ReportOnAlloc(b2);
+ free(b2);
+
+ // Analyze 1: reported 4 times.
+ // Analyze 2: freed, irrelevant.
+ char* c = (char*)calloc(10, 3);
+ Report(c);
+ for (int i = 0; i < aSeven - 4; i++) {
+ Report(c);
+ }
+
+ // Analyze 1: ignored.
+ // Analyze 2: irrelevant.
+ Report((void*)(intptr_t)i);
+
+ // jemalloc rounds this up to 8192.
+ // Analyze 1: reported.
+ // Analyze 2: freed.
+ char* e = (char*)malloc(4096);
+ e = (char*)realloc(e, 7169);
+ Report(e);
+
+ // First realloc is like malloc; second realloc is shrinking.
+ // Analyze 1: reported.
+ // Analyze 2: re-reported.
+ char* e2 = (char*)realloc(nullptr, 1024);
+ e2 = (char*)realloc(e2, 512);
+ Report(e2);
+
+ // First realloc is like malloc; second realloc creates a min-sized block.
+ // XXX: on Windows, second realloc frees the block.
+ // Analyze 1: reported.
+ // Analyze 2: freed, irrelevant.
+ char* e3 = (char*)realloc(nullptr, 1023);
+ // e3 = (char*) realloc(e3, 0);
+ MOZ_ASSERT(e3);
+ Report(e3);
+
+ // Analyze 1: freed, irrelevant.
+ // Analyze 2: freed, irrelevant.
+ char* f1 = (char*)malloc(64);
+ UseItOrLoseIt(f1, aSeven);
+ free(f1);
+
+ // Analyze 1: ignored.
+ // Analyze 2: irrelevant.
+ Report((void*)(intptr_t)0x0);
+
+ // Analyze 1: mixture of reported and unreported.
+ // Analyze 2: all unreported.
+ Foo(aSeven);
+
+ // Analyze 1: twice-reported.
+ // Analyze 2: twice-reported.
+ char* g1 = (char*)malloc(77);
+ ReportOnAlloc(g1);
+ ReportOnAlloc(g1);
+
+ // Analyze 1: mixture of reported and unreported.
+ // Analyze 2: all unreported.
+ // Nb: this Foo() call is deliberately not adjacent to the previous one. See
+ // the comment about adjacent calls in Foo() for more details.
+ Foo(aSeven);
+
+ // Analyze 1: twice-reported.
+ // Analyze 2: once-reported.
+ char* g2 = (char*)malloc(78);
+ Report(g2);
+ ReportOnAlloc(g2);
+
+ // Analyze 1: twice-reported.
+ // Analyze 2: once-reported.
+ char* g3 = (char*)malloc(79);
+ ReportOnAlloc(g3);
+ Report(g3);
+
+ // All the odd-ball ones.
+ // Analyze 1: all unreported.
+ // Analyze 2: all freed, irrelevant.
+ // XXX: no memalign on Mac
+ // void* w = memalign(64, 65); // rounds up to 128
+ // UseItOrLoseIt(w, aSeven);
+
+ // XXX: posix_memalign doesn't work on B2G
+ // void* x;
+ // posix_memalign(&y, 128, 129); // rounds up to 256
+ // UseItOrLoseIt(x, aSeven);
+
+ // XXX: valloc doesn't work on Windows.
+ // void* y = valloc(1); // rounds up to 4096
+ // UseItOrLoseIt(y, aSeven);
+
+ // XXX: C11 only
+ // void* z = aligned_alloc(64, 256);
+ // UseItOrLoseIt(z, aSeven);
+
+ if (aNum == 1) {
+ // Analyze 1.
+ Analyze(std::move(f));
+ }
+
+ ClearReports();
+
+ //---------
+
+ Report(a2);
+ Report(a2);
+ free(c);
+ free(e);
+ Report(e2);
+ free(e3);
+ // free(w);
+ // free(x);
+ // free(y);
+ // free(z);
+
+ // Do some allocations that will only show up in cumulative mode.
+ for (int i = 0; i < 100; i++) {
+ void* v = malloc(128);
+ UseItOrLoseIt(v, aSeven);
+ free(v);
+ }
+
+ if (aNum == 2) {
+ // Analyze 2.
+ Analyze(std::move(f));
+ }
+}
+
+void TestPartial(const char* aTestName, const char* aMode, int aSeven) {
+ char filename[128];
+ SprintfLiteral(filename, "complete-%s-%s.json", aTestName, aMode);
+ auto f = MakeUnique<FpWriteFunc>(filename);
+
+ char options[128];
+ SprintfLiteral(options, "--mode=%s", aMode);
+ ResetEverything(options);
+
+ int kTenThousand = aSeven + 9993;
+ char* s;
+
+ // The output of this function is deterministic but it relies on the
+ // probability and seeds given to the FastBernoulliTrial instance in
+ // ResetBernoulli(). If they change, the output will change too.
+
+ // Expected fraction with stacks: (1 - (1 - 0.003) ** 16) = 0.0469.
+ // So we expect about 0.0469 * 10000 == 469.
+ // We actually get 511.
+ for (int i = 0; i < kTenThousand; i++) {
+ s = (char*)malloc(16);
+ UseItOrLoseIt(s, aSeven);
+ }
+
+ // Expected fraction with stacks: (1 - (1 - 0.003) ** 128) = 0.3193.
+ // So we expect about 0.3193 * 10000 == 3193.
+ // We actually get 3136.
+ for (int i = 0; i < kTenThousand; i++) {
+ s = (char*)malloc(128);
+ UseItOrLoseIt(s, aSeven);
+ }
+
+ // Expected fraction with stacks: (1 - (1 - 0.003) ** 1024) = 0.9539.
+ // So we expect about 0.9539 * 10000 == 9539.
+ // We actually get 9531.
+ for (int i = 0; i < kTenThousand; i++) {
+ s = (char*)malloc(1024);
+ UseItOrLoseIt(s, aSeven);
+ }
+
+ Analyze(std::move(f));
+}
+
+void TestScan(int aSeven) {
+ auto f = MakeUnique<FpWriteFunc>("basic-scan.json");
+
+ ResetEverything("--mode=scan");
+
+ uintptr_t* p = (uintptr_t*)malloc(6 * sizeof(uintptr_t));
+ UseItOrLoseIt(p, aSeven);
+
+ // Hard-coded values checked by scan-test.py
+ p[0] = 0x123; // outside a block, small value
+ p[1] = 0x0; // null
+ p[2] = (uintptr_t)((uint8_t*)p - 1); // pointer outside a block, but nearby
+ p[3] = (uintptr_t)p; // pointer to start of a block
+ p[4] = (uintptr_t)((uint8_t*)p + 1); // pointer into a block
+ p[5] = 0x0; // trailing null
+
+ Analyze(std::move(f));
+}
+
+void RunTests() {
+ // This test relies on the compiler not doing various optimizations, such as
+ // eliding unused malloc() calls or unrolling loops with fixed iteration
+ // counts. So we compile it with -O0 (or equivalent), which probably prevents
+ // that. We also use the following variable for various loop iteration
+ // counts, just in case compilers might unroll very small loops even with
+ // -O0.
+ int seven = 7;
+
+ // Make sure that DMD is actually running; it is initialized on the first
+ // allocation.
+ int* x = (int*)malloc(100);
+ UseItOrLoseIt(x, seven);
+ MOZ_RELEASE_ASSERT(IsRunning());
+
+ // Please keep this in sync with run_test in test_dmd.js.
+
+ TestEmpty("empty", "live");
+ TestEmpty("empty", "dark-matter");
+ TestEmpty("empty", "cumulative");
+
+ TestFull("full", 1, "live", seven);
+ TestFull("full", 1, "dark-matter", seven);
+
+ TestFull("full", 2, "dark-matter", seven);
+ TestFull("full", 2, "cumulative", seven);
+
+ TestPartial("partial", "live", seven);
+
+ TestScan(seven);
+}
+
+int main() {
+ RunTests();
+
+ return 0;
+}
diff --git a/memory/replace/dmd/test/basic-scan-32-expected.txt b/memory/replace/dmd/test/basic-scan-32-expected.txt
new file mode 100644
index 0000000000..9f6f4db325
--- /dev/null
+++ b/memory/replace/dmd/test/basic-scan-32-expected.txt
@@ -0,0 +1,25 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o basic-scan-32-actual.txt --clamp-contents basic-scan.json
+
+Invocation {
+ $DMD = '--mode=scan'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 1 block in heap block record 1 of 1
+ 32 bytes (24 requested / 8 slop)
+ 100.00% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 32 bytes in 1 blocks
+}
+
diff --git a/memory/replace/dmd/test/basic-scan-64-expected.txt b/memory/replace/dmd/test/basic-scan-64-expected.txt
new file mode 100644
index 0000000000..59effc07b7
--- /dev/null
+++ b/memory/replace/dmd/test/basic-scan-64-expected.txt
@@ -0,0 +1,25 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o basic-scan-64-actual.txt --clamp-contents basic-scan.json
+
+Invocation {
+ $DMD = '--mode=scan'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 1 block in heap block record 1 of 1
+ 48 bytes (48 requested / 0 slop)
+ 100.00% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 48 bytes in 1 blocks
+}
+
diff --git a/memory/replace/dmd/test/complete-empty-cumulative-expected.txt b/memory/replace/dmd/test/complete-empty-cumulative-expected.txt
new file mode 100644
index 0000000000..2486015d0b
--- /dev/null
+++ b/memory/replace/dmd/test/complete-empty-cumulative-expected.txt
@@ -0,0 +1,18 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-empty-cumulative-actual.txt complete-empty-cumulative.json
+
+Invocation {
+ $DMD = '--mode=cumulative --stacks=full'
+ Mode = 'cumulative'
+}
+
+#-----------------------------------------------------------------
+
+# no cumulative heap blocks
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 0 bytes in 0 blocks
+}
+
diff --git a/memory/replace/dmd/test/complete-empty-dark-matter-expected.txt b/memory/replace/dmd/test/complete-empty-dark-matter-expected.txt
new file mode 100644
index 0000000000..0020cddde3
--- /dev/null
+++ b/memory/replace/dmd/test/complete-empty-dark-matter-expected.txt
@@ -0,0 +1,29 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-empty-dark-matter-actual.txt complete-empty-dark-matter.json
+
+Invocation {
+ $DMD = '--mode=dark-matter --stacks=full'
+ Mode = 'dark-matter'
+}
+
+#-----------------------------------------------------------------
+
+# no twice-reported heap blocks
+
+#-----------------------------------------------------------------
+
+# no unreported heap blocks
+
+#-----------------------------------------------------------------
+
+# no once-reported heap blocks
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 0 bytes (100.00%) in 0 blocks (100.00%)
+ Unreported: 0 bytes ( 0.00%) in 0 blocks ( 0.00%)
+ Once-reported: 0 bytes ( 0.00%) in 0 blocks ( 0.00%)
+ Twice-reported: 0 bytes ( 0.00%) in 0 blocks ( 0.00%)
+}
+
diff --git a/memory/replace/dmd/test/complete-empty-live-expected.txt b/memory/replace/dmd/test/complete-empty-live-expected.txt
new file mode 100644
index 0000000000..d0d1721965
--- /dev/null
+++ b/memory/replace/dmd/test/complete-empty-live-expected.txt
@@ -0,0 +1,18 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-empty-live-actual.txt complete-empty-live.json
+
+Invocation {
+ $DMD = '--mode=live --stacks=full'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+# no live heap blocks
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 0 bytes in 0 blocks
+}
+
diff --git a/memory/replace/dmd/test/complete-full1-dark-matter-expected.txt b/memory/replace/dmd/test/complete-full1-dark-matter-expected.txt
new file mode 100644
index 0000000000..2c7d6b6343
--- /dev/null
+++ b/memory/replace/dmd/test/complete-full1-dark-matter-expected.txt
@@ -0,0 +1,265 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-full1-dark-matter-actual.txt complete-full1-dark-matter.json
+
+Invocation {
+ $DMD = '--mode=dark-matter --stacks=full --show-dump-stats=yes'
+ Mode = 'dark-matter'
+}
+
+#-----------------------------------------------------------------
+
+Twice-reported {
+ 1 block in heap block record 1 of 4
+ 80 bytes (79 requested / 1 slop)
+ 0.66% of the heap (0.66% cumulative)
+ 29.41% of twice-reported (29.41% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+ Reported again at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Twice-reported {
+ 1 block in heap block record 2 of 4
+ 80 bytes (78 requested / 2 slop)
+ 0.66% of the heap (1.32% cumulative)
+ 29.41% of twice-reported (58.82% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+ Reported again at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Twice-reported {
+ 1 block in heap block record 3 of 4
+ 80 bytes (77 requested / 3 slop)
+ 0.66% of the heap (1.98% cumulative)
+ 29.41% of twice-reported (88.24% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+ Reported again at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Twice-reported {
+ 1 block in heap block record 4 of 4
+ 32 bytes (30 requested / 2 slop)
+ 0.26% of the heap (2.25% cumulative)
+ 11.76% of twice-reported (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+ Reported again at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Unreported {
+ 9 blocks in heap block record 1 of 3
+ 1,008 bytes (900 requested / 108 slop)
+ Individual block sizes: 112 x 9
+ 8.33% of the heap (8.33% cumulative)
+ 81.82% of unreported (81.82% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Unreported {
+ 2 blocks in heap block record 2 of 3
+ 112 bytes (112 requested / 0 slop)
+ Individual block sizes: 64; 48
+ 0.93% of the heap (9.26% cumulative)
+ 9.09% of unreported (90.91% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Unreported {
+ 2 blocks in heap block record 3 of 3
+ 112 bytes (112 requested / 0 slop)
+ Individual block sizes: 64; 48
+ 0.93% of the heap (10.19% cumulative)
+ 9.09% of unreported (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Once-reported {
+ 1 block in heap block record 1 of 11
+ 8,192 bytes (7,169 requested / 1,023 slop)
+ 67.72% of the heap (67.72% cumulative)
+ 77.34% of once-reported (77.34% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 2 of 11
+ 1,024 bytes (1,023 requested / 1 slop)
+ 8.47% of the heap (76.19% cumulative)
+ 9.67% of once-reported (87.01% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 3 of 11
+ 512 bytes (512 requested / 0 slop)
+ 4.23% of the heap (80.42% cumulative)
+ 4.83% of once-reported (91.84% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 2 blocks in heap block record 4 of 11
+ 240 bytes (240 requested / 0 slop)
+ Individual block sizes: 128; 112
+ 1.98% of the heap (82.41% cumulative)
+ 2.27% of once-reported (94.11% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 2 blocks in heap block record 5 of 11
+ 240 bytes (240 requested / 0 slop)
+ Individual block sizes: 128; 112
+ 1.98% of the heap (84.39% cumulative)
+ 2.27% of once-reported (96.37% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 6 of 11
+ 96 bytes (96 requested / 0 slop)
+ 0.79% of the heap (85.19% cumulative)
+ 0.91% of once-reported (97.28% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 7 of 11
+ 96 bytes (96 requested / 0 slop)
+ 0.79% of the heap (85.98% cumulative)
+ 0.91% of once-reported (98.19% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 8 of 11
+ 80 bytes (80 requested / 0 slop)
+ 0.66% of the heap (86.64% cumulative)
+ 0.76% of once-reported (98.94% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 9 of 11
+ 80 bytes (80 requested / 0 slop)
+ 0.66% of the heap (87.30% cumulative)
+ 0.76% of once-reported (99.70% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 10 of 11
+ 16 bytes (16 requested / 0 slop)
+ 0.13% of the heap (87.43% cumulative)
+ 0.15% of once-reported (99.85% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 11 of 11
+ 16 bytes (10 requested / 6 slop)
+ 0.13% of the heap (87.57% cumulative)
+ 0.15% of once-reported (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 12,096 bytes (100.00%) in 30 blocks (100.00%)
+ Unreported: 1,232 bytes ( 10.19%) in 13 blocks ( 43.33%)
+ Once-reported: 10,592 bytes ( 87.57%) in 13 blocks ( 43.33%)
+ Twice-reported: 272 bytes ( 2.25%) in 4 blocks ( 13.33%)
+}
+
diff --git a/memory/replace/dmd/test/complete-full1-live-expected.txt b/memory/replace/dmd/test/complete-full1-live-expected.txt
new file mode 100644
index 0000000000..eaa1883e1f
--- /dev/null
+++ b/memory/replace/dmd/test/complete-full1-live-expected.txt
@@ -0,0 +1,127 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-full1-live-actual.txt complete-full1-live.json
+
+Invocation {
+ $DMD = '--mode=live --stacks=full --show-dump-stats=yes'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 1 block in heap block record 1 of 12
+ 8,192 bytes (7,169 requested / 1,023 slop)
+ 67.72% of the heap (67.72% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 2 of 12
+ 1,024 bytes (1,023 requested / 1 slop)
+ 8.47% of the heap (76.19% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 9 blocks in heap block record 3 of 12
+ 1,008 bytes (900 requested / 108 slop)
+ Individual block sizes: 112 x 9
+ 8.33% of the heap (84.52% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 6 blocks in heap block record 4 of 12
+ 528 bytes (528 requested / 0 slop)
+ Individual block sizes: 128; 112; 96; 80; 64; 48
+ 4.37% of the heap (88.89% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 6 blocks in heap block record 5 of 12
+ 528 bytes (528 requested / 0 slop)
+ Individual block sizes: 128; 112; 96; 80; 64; 48
+ 4.37% of the heap (93.25% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 6 of 12
+ 512 bytes (512 requested / 0 slop)
+ 4.23% of the heap (97.49% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 7 of 12
+ 80 bytes (79 requested / 1 slop)
+ 0.66% of the heap (98.15% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 8 of 12
+ 80 bytes (78 requested / 2 slop)
+ 0.66% of the heap (98.81% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 9 of 12
+ 80 bytes (77 requested / 3 slop)
+ 0.66% of the heap (99.47% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 10 of 12
+ 32 bytes (30 requested / 2 slop)
+ 0.26% of the heap (99.74% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 11 of 12
+ 16 bytes (16 requested / 0 slop)
+ 0.13% of the heap (99.87% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 1 block in heap block record 12 of 12
+ 16 bytes (10 requested / 6 slop)
+ 0.13% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 12,096 bytes in 30 blocks
+}
+
diff --git a/memory/replace/dmd/test/complete-full2-cumulative-expected.txt b/memory/replace/dmd/test/complete-full2-cumulative-expected.txt
new file mode 100644
index 0000000000..5a225b9b8e
--- /dev/null
+++ b/memory/replace/dmd/test/complete-full2-cumulative-expected.txt
@@ -0,0 +1,173 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-full2-cumulative-actual.txt complete-full2-cumulative.json
+
+Invocation {
+ $DMD = '--mode=cumulative --stacks=full --show-dump-stats=yes'
+ Mode = 'cumulative'
+}
+
+#-----------------------------------------------------------------
+
+Cumulative {
+ 100 blocks in heap block record 1 of 17
+ 12,800 bytes (12,800 requested / 0 slop)
+ Individual block sizes: 128 x 100
+ 42.37% of the heap (42.37% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 2 of 17
+ 8,192 bytes (7,169 requested / 1,023 slop)
+ 27.12% of the heap (69.49% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 3 of 17
+ 4,096 bytes (4,096 requested / 0 slop)
+ 13.56% of the heap (83.05% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 10 blocks in heap block record 4 of 17
+ 1,120 bytes (1,000 requested / 120 slop)
+ Individual block sizes: 112 x 10
+ 3.71% of the heap (86.76% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 5 of 17
+ 1,024 bytes (1,024 requested / 0 slop)
+ 3.39% of the heap (90.15% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 6 of 17
+ 1,024 bytes (1,023 requested / 1 slop)
+ 3.39% of the heap (93.54% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 6 blocks in heap block record 7 of 17
+ 528 bytes (528 requested / 0 slop)
+ Individual block sizes: 128; 112; 96; 80; 64; 48
+ 1.75% of the heap (95.29% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 6 blocks in heap block record 8 of 17
+ 528 bytes (528 requested / 0 slop)
+ Individual block sizes: 128; 112; 96; 80; 64; 48
+ 1.75% of the heap (97.03% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 9 of 17
+ 512 bytes (512 requested / 0 slop)
+ 1.69% of the heap (98.73% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 10 of 17
+ 80 bytes (79 requested / 1 slop)
+ 0.26% of the heap (98.99% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 11 of 17
+ 80 bytes (78 requested / 2 slop)
+ 0.26% of the heap (99.26% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 12 of 17
+ 80 bytes (77 requested / 3 slop)
+ 0.26% of the heap (99.52% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 13 of 17
+ 64 bytes (64 requested / 0 slop)
+ 0.21% of the heap (99.74% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 14 of 17
+ 32 bytes (30 requested / 2 slop)
+ 0.11% of the heap (99.84% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 15 of 17
+ 16 bytes (16 requested / 0 slop)
+ 0.05% of the heap (99.89% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 16 of 17
+ 16 bytes (16 requested / 0 slop)
+ 0.05% of the heap (99.95% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Cumulative {
+ 1 block in heap block record 17 of 17
+ 16 bytes (10 requested / 6 slop)
+ 0.05% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 30,208 bytes in 135 blocks
+}
+
diff --git a/memory/replace/dmd/test/complete-full2-dark-matter-expected.txt b/memory/replace/dmd/test/complete-full2-dark-matter-expected.txt
new file mode 100644
index 0000000000..5f9585a8c6
--- /dev/null
+++ b/memory/replace/dmd/test/complete-full2-dark-matter-expected.txt
@@ -0,0 +1,140 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-full2-dark-matter-actual.txt complete-full2-dark-matter.json
+
+Invocation {
+ $DMD = '--mode=dark-matter --stacks=full --show-dump-stats=yes'
+ Mode = 'dark-matter'
+}
+
+#-----------------------------------------------------------------
+
+Twice-reported {
+ 1 block in heap block record 1 of 2
+ 80 bytes (77 requested / 3 slop)
+ 2.81% of the heap (2.81% cumulative)
+ 83.33% of twice-reported (83.33% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+ Reported again at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Twice-reported {
+ 1 block in heap block record 2 of 2
+ 16 bytes (16 requested / 0 slop)
+ 0.56% of the heap (3.37% cumulative)
+ 16.67% of twice-reported (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+ Reported again at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Unreported {
+ 9 blocks in heap block record 1 of 3
+ 1,008 bytes (900 requested / 108 slop)
+ Individual block sizes: 112 x 9
+ 35.39% of the heap (35.39% cumulative)
+ 48.84% of unreported (48.84% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Unreported {
+ 6 blocks in heap block record 2 of 3
+ 528 bytes (528 requested / 0 slop)
+ Individual block sizes: 128; 112; 96; 80; 64; 48
+ 18.54% of the heap (53.93% cumulative)
+ 25.58% of unreported (74.42% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Unreported {
+ 6 blocks in heap block record 3 of 3
+ 528 bytes (528 requested / 0 slop)
+ Individual block sizes: 128; 112; 96; 80; 64; 48
+ 18.54% of the heap (72.47% cumulative)
+ 25.58% of unreported (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Once-reported {
+ 1 block in heap block record 1 of 4
+ 512 bytes (512 requested / 0 slop)
+ 17.98% of the heap (17.98% cumulative)
+ 74.42% of once-reported (74.42% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 2 of 4
+ 80 bytes (79 requested / 1 slop)
+ 2.81% of the heap (20.79% cumulative)
+ 11.63% of once-reported (86.05% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 3 of 4
+ 80 bytes (78 requested / 2 slop)
+ 2.81% of the heap (23.60% cumulative)
+ 11.63% of once-reported (97.67% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Once-reported {
+ 1 block in heap block record 4 of 4
+ 16 bytes (10 requested / 6 slop)
+ 0.56% of the heap (24.16% cumulative)
+ 2.33% of once-reported (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+ Reported at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 2,848 bytes (100.00%) in 27 blocks (100.00%)
+ Unreported: 2,064 bytes ( 72.47%) in 21 blocks ( 77.78%)
+ Once-reported: 688 bytes ( 24.16%) in 4 blocks ( 14.81%)
+ Twice-reported: 96 bytes ( 3.37%) in 2 blocks ( 7.41%)
+}
+
diff --git a/memory/replace/dmd/test/complete-partial-live-expected.txt b/memory/replace/dmd/test/complete-partial-live-expected.txt
new file mode 100644
index 0000000000..e7f27b0ee6
--- /dev/null
+++ b/memory/replace/dmd/test/complete-partial-live-expected.txt
@@ -0,0 +1,56 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o complete-partial-live-actual.txt complete-partial-live.json
+
+Invocation {
+ $DMD = '--mode=live'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 9,531 blocks in heap block record 1 of 4
+ 9,759,744 bytes (9,759,744 requested / 0 slop)
+ Individual block sizes: 1,024 x 9,531
+ 83.56% of the heap (83.56% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 16,822 blocks in heap block record 2 of 4
+ 1,510,672 bytes (1,510,672 requested / 0 slop)
+ Individual block sizes: 1,024 x 469; 128 x 6,864; 16 x 9,489
+ 12.93% of the heap (96.49% cumulative)
+ Allocated at {
+ #01: (no stack trace recorded due to --stacks=partial)
+ }
+}
+
+Live {
+ 3,136 blocks in heap block record 3 of 4
+ 401,408 bytes (401,408 requested / 0 slop)
+ Individual block sizes: 128 x 3,136
+ 3.44% of the heap (99.93% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+Live {
+ 511 blocks in heap block record 4 of 4
+ 8,176 bytes (8,176 requested / 0 slop)
+ Individual block sizes: 16 x 511
+ 0.07% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: ... DMD.cpp ...
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 11,680,000 bytes in 30,000 blocks
+}
+
diff --git a/memory/replace/dmd/test/moz.build b/memory/replace/dmd/test/moz.build
new file mode 100644
index 0000000000..d6ec431c70
--- /dev/null
+++ b/memory/replace/dmd/test/moz.build
@@ -0,0 +1,26 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+GeckoSimplePrograms(
+ [
+ "SmokeDMD",
+ ],
+ linkage=None,
+)
+
+# See the comment at the top of SmokeDMD.cpp:RunTests().
+if CONFIG["CC_TYPE"] == "clang-cl":
+ CXXFLAGS += ["-Od", "-clang:-fno-lto"]
+else:
+ CXXFLAGS += ["-O0", "-fno-lto"]
+
+DEFINES["MOZ_NO_MOZALLOC"] = True
+
+DisableStlWrapping()
+
+XPCSHELL_TESTS_MANIFESTS += [
+ "xpcshell.ini",
+]
diff --git a/memory/replace/dmd/test/scan-test.py b/memory/replace/dmd/test/scan-test.py
new file mode 100644
index 0000000000..c282b02693
--- /dev/null
+++ b/memory/replace/dmd/test/scan-test.py
@@ -0,0 +1,102 @@
+#! /usr/bin/env python
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""Testing for the JSON file emitted by DMD heap scan mode when running SmokeDMD."""
+
+import argparse
+import gzip
+import json
+import sys
+
+# The DMD output version this script handles.
+outputVersion = 5
+
+
+def parseCommandLine():
+ description = """
+Ensure that DMD heap scan mode creates the correct output when run with SmokeDMD.
+This is only for testing. Input files can be gzipped.
+"""
+ p = argparse.ArgumentParser(description=description)
+
+ p.add_argument(
+ "--clamp-contents",
+ action="store_true",
+ help="expect that the contents of the JSON input file have had "
+ "their addresses clamped",
+ )
+
+ p.add_argument("input_file", help="a file produced by DMD")
+
+ return p.parse_args(sys.argv[1:])
+
+
+def checkScanContents(contents, expected):
+ if len(contents) != len(expected):
+ raise Exception(
+ "Expected "
+ + str(len(expected))
+ + " things in contents but found "
+ + str(len(contents))
+ )
+
+ for i in range(len(expected)):
+ if contents[i] != expected[i]:
+ raise Exception(
+ "Expected to find "
+ + expected[i]
+ + " at offset "
+ + str(i)
+ + " but found "
+ + contents[i]
+ )
+
+
+def main():
+ args = parseCommandLine()
+
+ # Handle gzipped input if necessary.
+ isZipped = args.input_file.endswith(".gz")
+ opener = gzip.open if isZipped else open
+
+ with opener(args.input_file, "rb") as f:
+ j = json.load(f)
+
+ if j["version"] != outputVersion:
+ raise Exception("'version' property isn't '{:d}'".format(outputVersion))
+
+ invocation = j["invocation"]
+
+ mode = invocation["mode"]
+ if mode != "scan":
+ raise Exception("bad 'mode' property: '{:s}'".format(mode))
+
+ blockList = j["blockList"]
+
+ if len(blockList) != 1:
+ raise Exception("Expected only one block")
+
+ b = blockList[0]
+
+ # The expected values are based on hard-coded values in SmokeDMD.cpp.
+ if args.clamp_contents:
+ expected = ["0", "0", "0", b["addr"], b["addr"]]
+ else:
+ addr = int(b["addr"], 16)
+ expected = [
+ "123",
+ "0",
+ str(format(addr - 1, "x")),
+ b["addr"],
+ str(format(addr + 1, "x")),
+ "0",
+ ]
+
+ checkScanContents(b["contents"], expected)
+
+
+if __name__ == "__main__":
+ main()
diff --git a/memory/replace/dmd/test/script-diff-dark-matter-expected.txt b/memory/replace/dmd/test/script-diff-dark-matter-expected.txt
new file mode 100644
index 0000000000..b1fc28bac5
--- /dev/null
+++ b/memory/replace/dmd/test/script-diff-dark-matter-expected.txt
@@ -0,0 +1,127 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-diff-dark-matter-actual.txt script-diff-dark-matter1.json script-diff-dark-matter2.json
+
+Invocation 1 {
+ $DMD = '--mode=dark-matter'
+ Mode = 'dark-matter'
+}
+
+Invocation 2 {
+ $DMD = '1'
+ Mode = 'dark-matter'
+}
+
+#-----------------------------------------------------------------
+
+Twice-reported {
+ -1 blocks in heap block record 1 of 1
+ -1,088 bytes (-1,064 requested / -24 slop)
+ Individual block sizes: -1,024; -127; 63
+ 15.46% of the heap (15.46% cumulative)
+ 100.00% of twice-reported (100.00% cumulative)
+ Allocated at {
+ #01: F (F.cpp:99)
+ }
+ Reported at {
+ #01: R1 (R1.cpp:99)
+ }
+ Reported again at {
+ #01: R2 (R2.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Unreported {
+ 4 blocks in heap block record 1 of 5
+ 16,384 bytes (16,384 requested / 0 slop)
+ Individual block sizes: 4,096 x 4
+ -232.76% of the heap (-232.76% cumulative)
+ 371.01% of unreported (371.01% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ }
+}
+
+Unreported {
+ 7 blocks in heap block record 2 of 5
+ -11,968 bytes (-12,016 requested / 48 slop)
+ Individual block sizes: -15,360; 2,048; 512 x 2; 128; -127; 64 x 4; 63
+ 170.02% of the heap (-62.74% cumulative)
+ -271.01% of unreported (100.00% cumulative)
+ Allocated at {
+ #01: F (F.cpp:99)
+ }
+}
+
+Unreported {
+ 0 blocks in heap block record 3 of 5
+ 0 bytes (-384 requested / 384 slop)
+ Individual block sizes: (no change)
+ -0.00% of the heap (-62.74% cumulative)
+ 0.00% of unreported (100.00% cumulative)
+ Allocated at {
+ #01: C (C.cpp:99)
+ }
+}
+
+Unreported {
+ -2 blocks in heap block record 4 of 5
+ 0 bytes (0 requested / 0 slop)
+ Individual block sizes: 8,192 x 2; -4,096 x 4
+ -0.00% of the heap (-62.74% cumulative)
+ 0.00% of unreported (100.00% cumulative)
+ Allocated at {
+ #01: B (B.cpp:99)
+ }
+}
+
+Unreported {
+ 0 blocks in heap block record 5 of 5
+ 0 bytes (0 requested / 0 slop)
+ Individual block sizes: 20,480; -16,384; -8,192; 4,096
+ -0.00% of the heap (-62.74% cumulative)
+ 0.00% of unreported (100.00% cumulative)
+ Allocated at {
+ #01: (no stack trace recorded due to --stacks=partial)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Once-reported {
+ -3 blocks in heap block record 1 of 2
+ -10,240 bytes (-10,192 requested / -48 slop)
+ Individual block sizes: -4,096 x 2; -2,048
+ 145.48% of the heap (145.48% cumulative)
+ 98.77% of once-reported (98.77% cumulative)
+ Allocated at {
+ #01: D (D.cpp:99)
+ }
+ Reported at {
+ #01: R1 (R1.cpp:99)
+ }
+}
+
+Once-reported {
+ -1 blocks in heap block record 2 of 2
+ -127 bytes (-151 requested / 24 slop)
+ 1.80% of the heap (147.28% cumulative)
+ 1.23% of once-reported (100.00% cumulative)
+ Allocated at {
+ #01: F (F.cpp:99)
+ }
+ Reported at {
+ #01: R1 (R1.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: -7,039 bytes (100.00%) in 4 blocks (100.00%)
+ Unreported: 4,416 bytes (-62.74%) in 9 blocks (225.00%)
+ Once-reported: -10,367 bytes (147.28%) in -4 blocks (-100.00%)
+ Twice-reported: -1,088 bytes ( 15.46%) in -1 blocks (-25.00%)
+}
+
diff --git a/memory/replace/dmd/test/script-diff-dark-matter1.json b/memory/replace/dmd/test/script-diff-dark-matter1.json
new file mode 100644
index 0000000000..1175394150
--- /dev/null
+++ b/memory/replace/dmd/test/script-diff-dark-matter1.json
@@ -0,0 +1,51 @@
+{
+ "version": 5,
+ "invocation": {
+ "dmdEnvVar": "--mode=dark-matter",
+ "mode": "dark-matter"
+ },
+ "blockList": [
+ { "req": 4096, "alloc": "A", "num": 4 },
+
+ { "req": 4096, "alloc": "B", "num": 3 },
+ { "req": 4096, "alloc": "B" },
+
+ { "req": 4096, "alloc": "C", "num": 2 },
+ { "req": 4096, "alloc": "C", "num": 2 },
+
+ { "req": 4096, "alloc": "D", "reps": ["R1"], "num": 2 },
+ { "req": 2000, "slop": 48, "alloc": "D", "reps": ["R1"] },
+
+ { "req": 15360, "alloc": "F" },
+ { "req": 512, "alloc": "F", "num": 2 },
+ { "req": 127, "alloc": "F" },
+ { "req": 1024, "alloc": "F", "reps": ["R1"] },
+ { "req": 127, "alloc": "F", "reps": ["R1"] },
+ { "req": 1000, "slop": 24, "alloc": "F", "reps": ["R1", "R2"] },
+ { "req": 127, "alloc": "F", "reps": ["R1", "R2"] },
+
+ { "req": 4096 },
+ { "req": 8192 },
+ { "req": 16384 }
+ ],
+ "traceTable": {
+ "A": ["AA"],
+ "B": ["BB"],
+ "C": ["CC"],
+ "D": ["DD"],
+ "E": ["EE"],
+ "F": ["FF"],
+ "R1": ["RR1"],
+ "R2": ["RR2"]
+ },
+ "frameTable": {
+ "AA": "#00: A (A.cpp:99)",
+ "BB": "#00: B (B.cpp:99)",
+ "CC": "#00: C (C.cpp:99)",
+ "DD": "#00: D (D.cpp:99)",
+ "EE": "#00: E (E.cpp:99)",
+ "FF": "#00: F (F.cpp:99)",
+ "RR1": "#00: R1 (R1.cpp:99)",
+ "RR2": "#00: R2 (R2.cpp:99)"
+ }
+}
diff --git a/memory/replace/dmd/test/script-diff-dark-matter2.json b/memory/replace/dmd/test/script-diff-dark-matter2.json
new file mode 100644
index 0000000000..2c3061223f
--- /dev/null
+++ b/memory/replace/dmd/test/script-diff-dark-matter2.json
@@ -0,0 +1,51 @@
+{
+ "version": 5,
+ "invocation": {
+ "dmdEnvVar": "1",
+ "mode": "dark-matter"
+ },
+ "blockList": [
+ { "req": 4096, "alloc": "A", "num": 4 },
+
+ { "req": 8192, "alloc": "B" },
+ { "req": 8192, "alloc": "B" },
+
+ { "req": 4000, "slop": 96, "alloc": "C", "num": 4 },
+
+ { "req": 4096, "alloc": "E", "num": 4 },
+
+ { "req": 2000, "slop": 48, "alloc": "F" },
+ { "req": 1000, "slop": 24, "alloc": "F", "reps": ["R1"] },
+ { "req": 512, "alloc": "F" },
+ { "req": 512, "alloc": "F" },
+ { "req": 512, "alloc": "F" },
+ { "req": 512, "alloc": "F" },
+ { "req": 128, "alloc": "F" },
+ { "req": 63, "alloc": "F", "reps": ["R1", "R2"] },
+ { "req": 64, "alloc": "F", "num": 4 },
+ { "req": 63, "alloc": "F" },
+
+ { "req": 4096, "num": 2 },
+ { "req": 20480 }
+ ],
+ "traceTable": {
+ "A": ["AA"],
+ "B": ["BB"],
+ "C": ["CC"],
+ "D": ["DD"],
+ "E": ["EE"],
+ "F": ["FF"],
+ "R1": ["RR1"],
+ "R2": ["RR2"]
+ },
+ "frameTable": {
+ "AA": "#00: A (A.cpp:99)",
+ "BB": "#00: B (B.cpp:99)",
+ "CC": "#00: C (C.cpp:99)",
+ "DD": "#00: D (D.cpp:99)",
+ "EE": "#00: E (E.cpp:99)",
+ "FF": "#00: F (F.cpp:99)",
+ "RR1": "#00: R1 (R1.cpp:99)",
+ "RR2": "#00: R2 (R2.cpp:99)"
+ }
+}
diff --git a/memory/replace/dmd/test/script-diff-live-expected.txt b/memory/replace/dmd/test/script-diff-live-expected.txt
new file mode 100644
index 0000000000..20208c0768
--- /dev/null
+++ b/memory/replace/dmd/test/script-diff-live-expected.txt
@@ -0,0 +1,81 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-diff-live-actual.txt script-diff-live1.json script-diff-live2.json
+
+Invocation 1 {
+ $DMD = '--mode=live'
+ Mode = 'live'
+}
+
+Invocation 2 {
+ $DMD = '--mode=live --stacks=partial'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 4 blocks in heap block record 1 of 6
+ 16,384 bytes (16,384 requested / 0 slop)
+ Individual block sizes: 4,096 x 4
+ -232.76% of the heap (-232.76% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ }
+}
+
+Live {
+ 5 blocks in heap block record 2 of 6
+ -13,183 bytes (-13,231 requested / 48 slop)
+ Individual block sizes: -15,360; 2,048; -1,024; 512 x 2; 128; -127 x 3; 64 x 4; 63 x 2
+ 187.29% of the heap (-45.48% cumulative)
+ Allocated at {
+ #01: F (F.cpp:99)
+ }
+}
+
+Live {
+ -3 blocks in heap block record 3 of 6
+ -10,240 bytes (-10,192 requested / -48 slop)
+ Individual block sizes: -4,096 x 2; -2,048
+ 145.48% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: D (D.cpp:99)
+ }
+}
+
+Live {
+ 0 blocks in heap block record 4 of 6
+ 0 bytes (-384 requested / 384 slop)
+ Individual block sizes: (no change)
+ -0.00% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: C (C.cpp:99)
+ }
+}
+
+Live {
+ -2 blocks in heap block record 5 of 6
+ 0 bytes (0 requested / 0 slop)
+ Individual block sizes: 8,192 x 2; -4,096 x 4
+ -0.00% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: B (B.cpp:99)
+ }
+}
+
+Live {
+ 0 blocks in heap block record 6 of 6
+ 0 bytes (0 requested / 0 slop)
+ Individual block sizes: 20,480; -16,384; -8,192; 4,096
+ -0.00% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: (no stack trace recorded due to --stacks=partial)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: -7,039 bytes in 4 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-diff-live1.json b/memory/replace/dmd/test/script-diff-live1.json
new file mode 100644
index 0000000000..1296b9ea09
--- /dev/null
+++ b/memory/replace/dmd/test/script-diff-live1.json
@@ -0,0 +1,51 @@
+{
+ "version": 5,
+ "invocation": {
+ "dmdEnvVar": "--mode=live",
+ "mode": "live"
+ },
+ "blockList": [
+ { "req": 4096, "alloc": "A", "num": 4 },
+
+ { "req": 4096, "alloc": "B", "num": 4 },
+
+ { "req": 4096, "alloc": "C", "num": 4 },
+
+ { "req": 4096, "alloc": "D" },
+ { "req": 4096, "alloc": "D" },
+ { "req": 2000, "slop": 48, "alloc": "D" },
+
+ { "req": 15360, "alloc": "F" },
+ { "req": 512, "alloc": "F" },
+ { "req": 512, "alloc": "F" },
+ { "req": 127, "alloc": "F" },
+ { "req": 1024, "alloc": "F" },
+ { "req": 127, "alloc": "F" },
+ { "req": 1000, "slop": 24, "alloc": "F" },
+ { "req": 127, "alloc": "F" },
+
+ { "req": 4096 },
+ { "req": 8192 },
+ { "req": 16384 }
+ ],
+ "traceTable": {
+ "A": ["AA"],
+ "B": ["BB"],
+ "C": ["CC"],
+ "D": ["DD"],
+ "E": ["EE"],
+ "F": ["FF"],
+ "R1": ["RR1"],
+ "R2": ["RR2"]
+ },
+ "frameTable": {
+ "AA": "#00: A (A.cpp:99)",
+ "BB": "#00: B (B.cpp:99)",
+ "CC": "#00: C (C.cpp:99)",
+ "DD": "#00: D (D.cpp:99)",
+ "EE": "#00: E (E.cpp:99)",
+ "FF": "#00: F (F.cpp:99)",
+ "RR1": "#00: R1 (R1.cpp:99)",
+ "RR2": "#00: R2 (R2.cpp:99)"
+ }
+}
diff --git a/memory/replace/dmd/test/script-diff-live2.json b/memory/replace/dmd/test/script-diff-live2.json
new file mode 100644
index 0000000000..723ea5ff35
--- /dev/null
+++ b/memory/replace/dmd/test/script-diff-live2.json
@@ -0,0 +1,53 @@
+{
+ "version": 5,
+ "invocation": {
+ "dmdEnvVar": "--mode=live --stacks=partial",
+ "mode": "live"
+ },
+ "blockList": [
+ { "req": 4096, "alloc": "A", "num": 3 },
+ { "req": 4096, "alloc": "A" },
+
+ { "req": 8192, "alloc": "B" },
+ { "req": 8192, "alloc": "B" },
+
+ { "req": 4000, "slop": 96, "alloc": "C", "num": 4 },
+
+ { "req": 4096, "alloc": "E" },
+ { "req": 4096, "alloc": "E" },
+ { "req": 4096, "alloc": "E" },
+ { "req": 4096, "alloc": "E" },
+
+ { "req": 2000, "slop": 48, "alloc": "F" },
+ { "req": 1000, "slop": 24, "alloc": "F" },
+ { "req": 512, "alloc": "F", "num": 4 },
+ { "req": 128, "alloc": "F" },
+ { "req": 63, "alloc": "F" },
+ { "req": 64, "alloc": "F", "num": 4 },
+ { "req": 63, "alloc": "F" },
+
+ { "req": 4096 },
+ { "req": 4096 },
+ { "req": 20480 }
+ ],
+ "traceTable": {
+ "A": ["AA"],
+ "B": ["BB"],
+ "C": ["CC"],
+ "D": ["DD"],
+ "E": ["EE"],
+ "F": ["FF"],
+ "R1": ["RR1"],
+ "R2": ["RR2"]
+ },
+ "frameTable": {
+ "AA": "#00: A (A.cpp:99)",
+ "BB": "#00: B (B.cpp:99)",
+ "CC": "#00: C (C.cpp:99)",
+ "DD": "#00: D (D.cpp:99)",
+ "EE": "#00: E (E.cpp:99)",
+ "FF": "#00: F (F.cpp:99)",
+ "RR1": "#00: R1 (R1.cpp:99)",
+ "RR2": "#00: R2 (R2.cpp:99)"
+ }
+}
diff --git a/memory/replace/dmd/test/script-ignore-alloc-fns-expected.txt b/memory/replace/dmd/test/script-ignore-alloc-fns-expected.txt
new file mode 100644
index 0000000000..9428ef45fb
--- /dev/null
+++ b/memory/replace/dmd/test/script-ignore-alloc-fns-expected.txt
@@ -0,0 +1,72 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-ignore-alloc-fns-actual.txt --ignore-alloc-fns script-ignore-alloc-fns.json
+
+Invocation {
+ $DMD = '1'
+ Mode = 'dark-matter'
+}
+
+#-----------------------------------------------------------------
+
+# no twice-reported heap blocks
+
+#-----------------------------------------------------------------
+
+Unreported {
+ 1 block in heap block record 1 of 4
+ 1,048,576 bytes (1,048,576 requested / 0 slop)
+ 93.22% of the heap (93.22% cumulative)
+ 93.22% of unreported (93.22% cumulative)
+ Allocated at {
+ #01: A (A.cpp:99)
+ }
+}
+
+Unreported {
+ 1 block in heap block record 2 of 4
+ 65,536 bytes (65,536 requested / 0 slop)
+ 5.83% of the heap (99.05% cumulative)
+ 5.83% of unreported (99.05% cumulative)
+ Allocated at {
+ #01: js::jit::JitRuntime::initialize(JSContext*) (Ion.cpp:301)
+ }
+}
+
+Unreported {
+ 1 block in heap block record 3 of 4
+ 8,192 bytes (8,000 requested / 192 slop)
+ 0.73% of the heap (99.78% cumulative)
+ 0.73% of unreported (99.78% cumulative)
+ Allocated at {
+ #01: mozilla::Vector::growStorageBy(unsigned long) (Vector.h:802)
+ #02: D (D.cpp:99)
+ }
+}
+
+Unreported {
+ 1 block in heap block record 4 of 4
+ 2,500 bytes (2,500 requested / 0 slop)
+ 0.22% of the heap (100.00% cumulative)
+ 0.22% of unreported (100.00% cumulative)
+ Allocated at {
+ #01: g_type_create_instance (/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0)
+ #02: not_an_alloc_function_so_alloc_functions_below_here_will_not_be_stripped (blah)
+ #03: replace_posix_memalign (replace_malloc.h:120)
+ #04: ??? (/lib/x86_64-linux-gnu/libglib-2.0.so.0)
+ #05: another_non_alloc_function (blah)
+ }
+}
+
+#-----------------------------------------------------------------
+
+# no once-reported heap blocks
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 1,124,804 bytes (100.00%) in 4 blocks (100.00%)
+ Unreported: 1,124,804 bytes (100.00%) in 4 blocks (100.00%)
+ Once-reported: 0 bytes ( 0.00%) in 0 blocks ( 0.00%)
+ Twice-reported: 0 bytes ( 0.00%) in 0 blocks ( 0.00%)
+}
+
diff --git a/memory/replace/dmd/test/script-ignore-alloc-fns.json b/memory/replace/dmd/test/script-ignore-alloc-fns.json
new file mode 100644
index 0000000000..a6c7c8419a
--- /dev/null
+++ b/memory/replace/dmd/test/script-ignore-alloc-fns.json
@@ -0,0 +1,45 @@
+{
+ "version": 5,
+ "invocation": {
+ "dmdEnvVar": "1",
+ "mode": "dark-matter"
+ },
+ "blockList": [
+ { "req": 1048576, "alloc": "A" },
+ { "req": 65536, "alloc": "B" },
+ { "req": 8000, "slop": 192, "alloc": "C" },
+ { "req": 2500, "alloc": "D" }
+ ],
+ "traceTable": {
+ "A": ["AA", "AB", "AC", "AD"],
+ "B": ["BA", "BB", "BC"],
+ "C": ["CA", "CB", "CC", "CD"],
+ "D": ["DA", "DB", "DD", "DD", "DE", "DF", "DG", "DH", "DI", "DJ"]
+ },
+ "frameTable": {
+ "AA": "#00: replace_malloc (DMD.cpp:1106)",
+ "AB": "#00: moz_xmalloc (mozalloc.cpp:68)",
+ "AC": "#00: operator new(unsigned long) (mozalloc.h:208)",
+ "AD": "#00: A (A.cpp:99)",
+
+ "BA": "#00: replace_calloc (DMD.cpp:1125)",
+ "BB": "#00: js_calloc(unsigned long) (Utility.h:107)",
+ "BC": "#06: js::jit::JitRuntime::initialize(JSContext*) (Ion.cpp:301)",
+
+ "CA": "#00: replace_realloc (DMD.cpp:1153)",
+ "CB": "#00: bool* mozilla::MallocAllocPolicy::pod_realloc<bool>(bool*, unsigned long, unsigned long) (AllocPolicy.h:74)",
+ "CC": "#00: mozilla::Vector::growStorageBy(unsigned long) (Vector.h:802)",
+ "CD": "#00: D (D.cpp:99)",
+
+ "DA": "#00: replace_memalign (DMD.cpp:1181)",
+ "DB": "#00: replace_posix_memalign (replace_malloc.h:120)",
+ "DC": "#00: ??? (/lib/x86_64-linux-gnu/libglib-2.0.so.0)",
+ "DD": "#00: g_slice_alloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0)",
+ "DE": "#00: g_slice_alloc0 (/lib/x86_64-linux-gnu/libglib-2.0.so.0)",
+ "DF": "#00: g_type_create_instance (/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0)",
+ "DG": "#00: not_an_alloc_function_so_alloc_functions_below_here_will_not_be_stripped (blah)",
+ "DH": "#00: replace_posix_memalign (replace_malloc.h:120)",
+ "DI": "#00: ??? (/lib/x86_64-linux-gnu/libglib-2.0.so.0)",
+ "DJ": "#00: another_non_alloc_function (blah)"
+ }
+}
diff --git a/memory/replace/dmd/test/script-max-frames-1-expected.txt b/memory/replace/dmd/test/script-max-frames-1-expected.txt
new file mode 100644
index 0000000000..65a00762bb
--- /dev/null
+++ b/memory/replace/dmd/test/script-max-frames-1-expected.txt
@@ -0,0 +1,26 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-max-frames-1-actual.txt --max-frames=1 script-max-frames.json
+
+Invocation {
+ $DMD = '--mode=live --stacks=full'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 4 blocks in heap block record 1 of 1
+ 4,416 bytes (4,404 requested / 12 slop)
+ Individual block sizes: 4,096; 128; 112; 80
+ 100.00% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 4,416 bytes in 4 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-max-frames-3-expected.txt b/memory/replace/dmd/test/script-max-frames-3-expected.txt
new file mode 100644
index 0000000000..5df4914738
--- /dev/null
+++ b/memory/replace/dmd/test/script-max-frames-3-expected.txt
@@ -0,0 +1,48 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-max-frames-3-actual.txt --max-frames=3 --no-fix-stacks script-max-frames.json
+
+Invocation {
+ $DMD = '--mode=live --stacks=full'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 2 blocks in heap block record 1 of 3
+ 4,224 bytes (4,224 requested / 0 slop)
+ Individual block sizes: 4,096; 128
+ 95.65% of the heap (95.65% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ #02: F (F.cpp:99)
+ #03: G (G.cpp:99)
+ }
+}
+
+Live {
+ 1 block in heap block record 2 of 3
+ 112 bytes (100 requested / 12 slop)
+ 2.54% of the heap (98.19% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ #02: X (X.cpp:99)
+ #03: Y (Y.cpp:99)
+ }
+}
+
+Live {
+ 1 block in heap block record 3 of 3
+ 80 bytes (80 requested / 0 slop)
+ 1.81% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 4,416 bytes in 4 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-max-frames-8-expected.txt b/memory/replace/dmd/test/script-max-frames-8-expected.txt
new file mode 100644
index 0000000000..174992d5b8
--- /dev/null
+++ b/memory/replace/dmd/test/script-max-frames-8-expected.txt
@@ -0,0 +1,69 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-max-frames-8-actual.txt script-max-frames.json
+
+Invocation {
+ $DMD = '--mode=live --stacks=full'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 1 block in heap block record 1 of 4
+ 4,096 bytes (4,096 requested / 0 slop)
+ 92.75% of the heap (92.75% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ #02: F (F.cpp:99)
+ #03: G (G.cpp:99)
+ #04: H (H.cpp:99)
+ #05: I (I.cpp:99)
+ #06: J (J.cpp:99)
+ #07: K (K.cpp:99)
+ #08: L (L.cpp:99)
+ }
+}
+
+Live {
+ 1 block in heap block record 2 of 4
+ 128 bytes (128 requested / 0 slop)
+ 2.90% of the heap (95.65% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ #02: F (F.cpp:99)
+ #03: G (G.cpp:99)
+ #04: R (R.cpp:99)
+ #05: S (S.cpp:99)
+ #06: T (T.cpp:99)
+ #07: U (U.cpp:99)
+ #08: V (V.cpp:99)
+ }
+}
+
+Live {
+ 1 block in heap block record 3 of 4
+ 112 bytes (100 requested / 12 slop)
+ 2.54% of the heap (98.19% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ #02: X (X.cpp:99)
+ #03: Y (Y.cpp:99)
+ #04: Z (Z.cpp:99)
+ }
+}
+
+Live {
+ 1 block in heap block record 4 of 4
+ 80 bytes (80 requested / 0 slop)
+ 1.81% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: E (E.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 4,416 bytes in 4 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-max-frames.json b/memory/replace/dmd/test/script-max-frames.json
new file mode 100644
index 0000000000..6de17a88c3
--- /dev/null
+++ b/memory/replace/dmd/test/script-max-frames.json
@@ -0,0 +1,43 @@
+{
+ "version": 5,
+ "invocation": {
+ "dmdEnvVar": "--mode=live --stacks=full",
+ "mode": "live"
+ },
+ "blockList": [
+ { "req": 4096, "alloc": "A" },
+ { "req": 128, "alloc": "B" },
+ { "req": 100, "slop": 12, "alloc": "C" },
+ { "req": 80, "alloc": "D" }
+ ],
+ "traceTable": {
+ "A": ["E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P"],
+ "B": ["E", "F", "G", "R", "S", "T", "U", "V"],
+ "C": ["E", "X", "Y", "Z"],
+ "D": ["E"]
+ },
+ "frameTable": {
+ "E": "#00: E (E.cpp:99)",
+ "F": "#00: F (F.cpp:99)",
+ "G": "#00: G (G.cpp:99)",
+ "H": "#00: H (H.cpp:99)",
+ "I": "#00: I (I.cpp:99)",
+ "J": "#00: J (J.cpp:99)",
+ "K": "#00: K (K.cpp:99)",
+ "L": "#00: L (L.cpp:99)",
+ "M": "#00: M (M.cpp:99)",
+ "N": "#00: N (N.cpp:99)",
+ "O": "#00: O (O.cpp:99)",
+ "P": "#00: P (P.cpp:99)",
+ "Q": "#00: Q (Q.cpp:99)",
+ "R": "#00: R (R.cpp:99)",
+ "S": "#00: S (S.cpp:99)",
+ "T": "#00: T (T.cpp:99)",
+ "U": "#00: U (U.cpp:99)",
+ "V": "#00: V (V.cpp:99)",
+ "W": "#00: W (W.cpp:99)",
+ "X": "#00: X (X.cpp:99)",
+ "Y": "#00: Y (Y.cpp:99)",
+ "Z": "#00: Z (Z.cpp:99)"
+ }
+}
diff --git a/memory/replace/dmd/test/script-sort-by-num-blocks-expected.txt b/memory/replace/dmd/test/script-sort-by-num-blocks-expected.txt
new file mode 100644
index 0000000000..8de03d953b
--- /dev/null
+++ b/memory/replace/dmd/test/script-sort-by-num-blocks-expected.txt
@@ -0,0 +1,46 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-sort-by-num-blocks-actual.txt --sort-by=num-blocks script-sort-by.json.gz
+
+Invocation {
+ $DMD = '--mode=live'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 8 blocks in heap block record 1 of 3
+ 16,384 bytes (8,200 requested / 8,184 slop)
+ Individual block sizes: 2,048 x 8
+ 33.32% of the heap (33.32% cumulative)
+ Allocated at {
+ #01: C (C.cpp:99)
+ }
+}
+
+Live {
+ 5 blocks in heap block record 2 of 3
+ 16,400 bytes (12,016 requested / 4,384 slop)
+ Individual block sizes: 4,096 x 4; 16
+ 33.35% of the heap (66.67% cumulative)
+ Allocated at {
+ #01: B (B.cpp:99)
+ }
+}
+
+Live {
+ 5 blocks in heap block record 3 of 3
+ 16,392 bytes (16,392 requested / 0 slop)
+ Individual block sizes: 4,096 x 4; 8
+ 33.33% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: A (A.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 49,176 bytes in 18 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-sort-by-req-expected.txt b/memory/replace/dmd/test/script-sort-by-req-expected.txt
new file mode 100644
index 0000000000..3ab21ba8f7
--- /dev/null
+++ b/memory/replace/dmd/test/script-sort-by-req-expected.txt
@@ -0,0 +1,46 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-sort-by-req-actual.txt --sort-by=req --no-fix-stacks script-sort-by.json.gz
+
+Invocation {
+ $DMD = '--mode=live'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 5 blocks in heap block record 1 of 3
+ 16,392 bytes (16,392 requested / 0 slop)
+ Individual block sizes: 4,096 x 4; 8
+ 33.33% of the heap (33.33% cumulative)
+ Allocated at {
+ #01: A (A.cpp:99)
+ }
+}
+
+Live {
+ 5 blocks in heap block record 2 of 3
+ 16,400 bytes (12,016 requested / 4,384 slop)
+ Individual block sizes: 4,096 x 4; 16
+ 33.35% of the heap (66.68% cumulative)
+ Allocated at {
+ #01: B (B.cpp:99)
+ }
+}
+
+Live {
+ 8 blocks in heap block record 3 of 3
+ 16,384 bytes (8,200 requested / 8,184 slop)
+ Individual block sizes: 2,048 x 8
+ 33.32% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: C (C.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 49,176 bytes in 18 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-sort-by-slop-expected.txt b/memory/replace/dmd/test/script-sort-by-slop-expected.txt
new file mode 100644
index 0000000000..c325c7ed40
--- /dev/null
+++ b/memory/replace/dmd/test/script-sort-by-slop-expected.txt
@@ -0,0 +1,46 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-sort-by-slop-actual.txt --sort-by=slop script-sort-by.json.gz
+
+Invocation {
+ $DMD = '--mode=live'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 8 blocks in heap block record 1 of 3
+ 16,384 bytes (8,200 requested / 8,184 slop)
+ Individual block sizes: 2,048 x 8
+ 33.32% of the heap (33.32% cumulative)
+ Allocated at {
+ #01: C (C.cpp:99)
+ }
+}
+
+Live {
+ 5 blocks in heap block record 2 of 3
+ 16,400 bytes (12,016 requested / 4,384 slop)
+ Individual block sizes: 4,096 x 4; 16
+ 33.35% of the heap (66.67% cumulative)
+ Allocated at {
+ #01: B (B.cpp:99)
+ }
+}
+
+Live {
+ 5 blocks in heap block record 3 of 3
+ 16,392 bytes (16,392 requested / 0 slop)
+ Individual block sizes: 4,096 x 4; 8
+ 33.33% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: A (A.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 49,176 bytes in 18 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-sort-by-usable-expected.txt b/memory/replace/dmd/test/script-sort-by-usable-expected.txt
new file mode 100644
index 0000000000..8239a4759e
--- /dev/null
+++ b/memory/replace/dmd/test/script-sort-by-usable-expected.txt
@@ -0,0 +1,46 @@
+#-----------------------------------------------------------------
+# dmd.py --filter-stacks-for-testing -o script-sort-by-usable-actual.txt --sort-by=usable script-sort-by.json.gz
+
+Invocation {
+ $DMD = '--mode=live'
+ Mode = 'live'
+}
+
+#-----------------------------------------------------------------
+
+Live {
+ 5 blocks in heap block record 1 of 3
+ 16,400 bytes (12,016 requested / 4,384 slop)
+ Individual block sizes: 4,096 x 4; 16
+ 33.35% of the heap (33.35% cumulative)
+ Allocated at {
+ #01: B (B.cpp:99)
+ }
+}
+
+Live {
+ 5 blocks in heap block record 2 of 3
+ 16,392 bytes (16,392 requested / 0 slop)
+ Individual block sizes: 4,096 x 4; 8
+ 33.33% of the heap (66.68% cumulative)
+ Allocated at {
+ #01: A (A.cpp:99)
+ }
+}
+
+Live {
+ 8 blocks in heap block record 3 of 3
+ 16,384 bytes (8,200 requested / 8,184 slop)
+ Individual block sizes: 2,048 x 8
+ 33.32% of the heap (100.00% cumulative)
+ Allocated at {
+ #01: C (C.cpp:99)
+ }
+}
+
+#-----------------------------------------------------------------
+
+Summary {
+ Total: 49,176 bytes in 18 blocks
+}
+
diff --git a/memory/replace/dmd/test/script-sort-by.json.gz b/memory/replace/dmd/test/script-sort-by.json.gz
new file mode 100644
index 0000000000..b2308bab40
--- /dev/null
+++ b/memory/replace/dmd/test/script-sort-by.json.gz
Binary files differ
diff --git a/memory/replace/dmd/test/test_dmd.js b/memory/replace/dmd/test/test_dmd.js
new file mode 100644
index 0000000000..d96444ea05
--- /dev/null
+++ b/memory/replace/dmd/test/test_dmd.js
@@ -0,0 +1,224 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-*/
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { FileUtils } = ChromeUtils.importESModule(
+ "resource://gre/modules/FileUtils.sys.mjs"
+);
+
+// The xpcshell test harness sets PYTHON so we can read it here.
+var gPythonName = Services.env.get("PYTHON");
+
+// If we're testing locally, the executable file is in "CurProcD". Otherwise,
+// it is in another location that we have to find.
+function getExecutable(aFilename) {
+ let file = FileUtils.getFile("CurProcD", [aFilename]);
+ if (!file.exists()) {
+ file = FileUtils.getFile("CurWorkD", []);
+ while (file.path.includes("xpcshell")) {
+ file = file.parent;
+ }
+ file.append("bin");
+ file.append(aFilename);
+ }
+ return file;
+}
+
+var gIsWindows = Services.appinfo.OS === "WINNT";
+var gDmdTestFile = getExecutable("SmokeDMD" + (gIsWindows ? ".exe" : ""));
+
+var gDmdScriptFile = getExecutable("dmd.py");
+
+var gScanTestFile = FileUtils.getFile("CurWorkD", ["scan-test.py"]);
+
+function readFile(aFile) {
+ let fstream = Cc["@mozilla.org/network/file-input-stream;1"].createInstance(
+ Ci.nsIFileInputStream
+ );
+ let cstream = Cc["@mozilla.org/intl/converter-input-stream;1"].createInstance(
+ Ci.nsIConverterInputStream
+ );
+ fstream.init(aFile, -1, 0, 0);
+ cstream.init(fstream, "UTF-8", 0, 0);
+
+ let data = "";
+ let str = {};
+ let read = 0;
+ do {
+ // Read as much as we can and put it in str.value.
+ read = cstream.readString(0xffffffff, str);
+ data += str.value;
+ } while (read != 0);
+
+ cstream.close(); // this closes fstream
+ return data.replace(/\r/g, ""); // normalize line endings
+}
+
+function runProcess(aExeFile, aArgs) {
+ let process = Cc["@mozilla.org/process/util;1"].createInstance(Ci.nsIProcess);
+ process.init(aExeFile);
+ process.run(/* blocking = */ true, aArgs, aArgs.length);
+ return process.exitValue;
+}
+
+function test(aPrefix, aArgs) {
+ // DMD writes the JSON files to CurWorkD, so we do likewise here with
+ // |actualFile| for consistency. It is removed once we've finished.
+ let expectedFile = FileUtils.getFile("CurWorkD", [aPrefix + "-expected.txt"]);
+ let actualFile = FileUtils.getFile("CurWorkD", [aPrefix + "-actual.txt"]);
+
+ // Run dmd.py on the JSON file, producing |actualFile|.
+
+ let args = [
+ gDmdScriptFile.path,
+ "--filter-stacks-for-testing",
+ "-o",
+ actualFile.path,
+ ].concat(aArgs);
+
+ runProcess(new FileUtils.File(gPythonName), args);
+
+ // Compare |expectedFile| with |actualFile|. We produce nice diffs with
+ // /usr/bin/diff on systems that have it (Mac and Linux). Otherwise (Windows)
+ // we do a string compare of the file contents and then print them both if
+ // they don't match.
+
+ let success;
+ try {
+ let rv = runProcess(new FileUtils.File("/usr/bin/diff"), [
+ "-u",
+ expectedFile.path,
+ actualFile.path,
+ ]);
+ success = rv == 0;
+ } catch (e) {
+ let expectedData = readFile(expectedFile);
+ let actualData = readFile(actualFile);
+ success = expectedData === actualData;
+ if (!success) {
+ expectedData = expectedData.split("\n");
+ actualData = actualData.split("\n");
+ for (let i = 0; i < expectedData.length; i++) {
+ print("EXPECTED:" + expectedData[i]);
+ }
+ for (let i = 0; i < actualData.length; i++) {
+ print(" ACTUAL:" + actualData[i]);
+ }
+ }
+ }
+
+ ok(success, aPrefix);
+
+ actualFile.remove(true);
+}
+
+// Run scan-test.py on the JSON file and see if it succeeds.
+function scanTest(aJsonFilePath, aExtraArgs) {
+ let args = [gScanTestFile.path, aJsonFilePath].concat(aExtraArgs);
+
+ return runProcess(new FileUtils.File(gPythonName), args) == 0;
+}
+
+function run_test() {
+ let jsonFile, jsonFile2;
+
+ // These tests do complete end-to-end testing of DMD, i.e. both the C++ code
+ // that generates the JSON output, and the script that post-processes that
+ // output.
+ //
+ // Run these synchronously, because test() updates the complete*.json files
+ // in-place (to fix stacks) when it runs dmd.py, and that's not safe to do
+ // asynchronously.
+
+ Services.env.set("DMD", "1");
+
+ runProcess(gDmdTestFile, []);
+
+ function test2(aTestName, aMode) {
+ let name = "complete-" + aTestName + "-" + aMode;
+ jsonFile = FileUtils.getFile("CurWorkD", [name + ".json"]);
+ test(name, [jsonFile.path]);
+ jsonFile.remove(true);
+ }
+
+ // Please keep this in sync with RunTests() in SmokeDMD.cpp.
+
+ test2("empty", "live");
+ test2("empty", "dark-matter");
+ test2("empty", "cumulative");
+
+ test2("full1", "live");
+ test2("full1", "dark-matter");
+
+ test2("full2", "dark-matter");
+ test2("full2", "cumulative");
+
+ test2("partial", "live");
+
+ // Heap scan testing.
+ jsonFile = FileUtils.getFile("CurWorkD", ["basic-scan.json"]);
+ ok(scanTest(jsonFile.path), "Basic scan test");
+
+ let is64Bit = Services.appinfo.is64Bit;
+ let basicScanFileName = "basic-scan-" + (is64Bit ? "64" : "32");
+ test(basicScanFileName, ["--clamp-contents", jsonFile.path]);
+ ok(
+ scanTest(jsonFile.path, ["--clamp-contents"]),
+ "Scan with address clamping"
+ );
+
+ // Run the generic test a second time to ensure that the first time produced
+ // valid JSON output. "--clamp-contents" is passed in so we don't have to have
+ // more variants of the files.
+ test(basicScanFileName, ["--clamp-contents", jsonFile.path]);
+ jsonFile.remove(true);
+
+ // These tests only test the post-processing script. They use hand-written
+ // JSON files as input. Ideally the JSON files would contain comments
+ // explaining how they work, but JSON doesn't allow comments, so I've put
+ // explanations here.
+
+ // This just tests that stack traces of various lengths are truncated
+ // appropriately. The number of records in the output is different for each
+ // of the tested values.
+ jsonFile = FileUtils.getFile("CurWorkD", ["script-max-frames.json"]);
+ test("script-max-frames-8", [jsonFile.path]); // --max-frames=8 is the default
+ test("script-max-frames-3", [
+ "--max-frames=3",
+ "--no-fix-stacks",
+ jsonFile.path,
+ ]);
+ test("script-max-frames-1", ["--max-frames=1", jsonFile.path]);
+
+ // This file has three records that are shown in a different order for each
+ // of the different sort values. It also tests the handling of gzipped JSON
+ // files.
+ jsonFile = FileUtils.getFile("CurWorkD", ["script-sort-by.json.gz"]);
+ test("script-sort-by-usable", ["--sort-by=usable", jsonFile.path]);
+ test("script-sort-by-req", [
+ "--sort-by=req",
+ "--no-fix-stacks",
+ jsonFile.path,
+ ]);
+ test("script-sort-by-slop", ["--sort-by=slop", jsonFile.path]);
+ test("script-sort-by-num-blocks", ["--sort-by=num-blocks", jsonFile.path]);
+
+ // This file has several real stack traces taken from Firefox execution, each
+ // of which tests a different allocator function (or functions).
+ jsonFile = FileUtils.getFile("CurWorkD", ["script-ignore-alloc-fns.json"]);
+ test("script-ignore-alloc-fns", ["--ignore-alloc-fns", jsonFile.path]);
+
+ // This tests "live"-mode diffs.
+ jsonFile = FileUtils.getFile("CurWorkD", ["script-diff-live1.json"]);
+ jsonFile2 = FileUtils.getFile("CurWorkD", ["script-diff-live2.json"]);
+ test("script-diff-live", [jsonFile.path, jsonFile2.path]);
+
+ // This tests "dark-matter"-mode diffs.
+ jsonFile = FileUtils.getFile("CurWorkD", ["script-diff-dark-matter1.json"]);
+ jsonFile2 = FileUtils.getFile("CurWorkD", ["script-diff-dark-matter2.json"]);
+ test("script-diff-dark-matter", [jsonFile.path, jsonFile2.path]);
+}
diff --git a/memory/replace/dmd/test/xpcshell.ini b/memory/replace/dmd/test/xpcshell.ini
new file mode 100644
index 0000000000..2baeeed270
--- /dev/null
+++ b/memory/replace/dmd/test/xpcshell.ini
@@ -0,0 +1,35 @@
+[DEFAULT]
+support-files =
+ basic-scan-32-expected.txt
+ basic-scan-64-expected.txt
+ complete-empty-live-expected.txt
+ complete-empty-dark-matter-expected.txt
+ complete-empty-cumulative-expected.txt
+ complete-full1-live-expected.txt
+ complete-full1-dark-matter-expected.txt
+ complete-full2-dark-matter-expected.txt
+ complete-full2-cumulative-expected.txt
+ complete-partial-live-expected.txt
+ scan-test.py
+ script-max-frames.json
+ script-max-frames-8-expected.txt
+ script-max-frames-3-expected.txt
+ script-max-frames-1-expected.txt
+ script-sort-by.json.gz
+ script-sort-by-usable-expected.txt
+ script-sort-by-req-expected.txt
+ script-sort-by-slop-expected.txt
+ script-sort-by-num-blocks-expected.txt
+ script-ignore-alloc-fns.json
+ script-ignore-alloc-fns-expected.txt
+ script-diff-live1.json
+ script-diff-live2.json
+ script-diff-live-expected.txt
+ script-diff-dark-matter1.json
+ script-diff-dark-matter2.json
+ script-diff-dark-matter-expected.txt
+
+[test_dmd.js]
+dmd = true
+skip-if =
+ !(os=='linux' || os=='mac' || (os=='win' && !pgo))
diff --git a/memory/replace/logalloc/FdPrintf.cpp b/memory/replace/logalloc/FdPrintf.cpp
new file mode 100644
index 0000000000..4a8e48af78
--- /dev/null
+++ b/memory/replace/logalloc/FdPrintf.cpp
@@ -0,0 +1,200 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <cstdarg>
+
+#ifdef _WIN32
+# include <windows.h>
+#else
+# include <unistd.h>
+#endif
+#include <cmath>
+#include <cstring>
+#include "mozilla/Assertions.h"
+#include "mozilla/Unused.h"
+#include "FdPrintf.h"
+
+/* Template class allowing a limited number of increments on a value */
+template <typename T>
+class CheckedIncrement {
+ public:
+ CheckedIncrement(T aValue, size_t aMaxIncrement)
+ : mValue(aValue), mMaxIncrement(aMaxIncrement) {}
+
+ T operator++(int) {
+ if (!mMaxIncrement) {
+ MOZ_CRASH("overflow detected");
+ }
+ mMaxIncrement--;
+ return mValue++;
+ }
+
+ T& operator++() {
+ (*this)++;
+ return mValue;
+ }
+
+ void advance(T end) {
+ // Only makes sense if T is a pointer type.
+ size_t diff = end - mValue;
+ if (diff > mMaxIncrement) {
+ MOZ_CRASH("overflow detected");
+ }
+ mMaxIncrement -= diff;
+ mValue = end;
+ };
+
+ void rewind(T pos) {
+ size_t diff = mValue - pos;
+ mMaxIncrement += diff;
+ mValue = pos;
+ }
+
+ operator T() { return mValue; }
+ T value() { return mValue; }
+
+ private:
+ T mValue;
+ size_t mMaxIncrement;
+};
+
+template <typename T>
+static unsigned NumDigits(T n) {
+ if (n < 1) {
+ // We want one digit, it will be 0.
+ return 1;
+ }
+
+ double l = log10(static_cast<double>(n));
+ double cl = ceil(l);
+ return l == cl ? unsigned(cl) + 1 : unsigned(cl);
+}
+
+static void LeftPad(CheckedIncrement<char*>& b, size_t pad) {
+ while (pad-- > 0) {
+ *(b++) = ' ';
+ }
+}
+
+// Write the digits into the buffer.
+static void WriteDigits(CheckedIncrement<char*>& b, size_t i,
+ size_t num_digits) {
+ size_t x = pow(10, double(num_digits - 1));
+ do {
+ *(b++) = "0123456789"[(i / x) % 10];
+ x /= 10;
+ } while (x > 0);
+}
+
+void FdPrintf(intptr_t aFd, const char* aFormat, ...) {
+ if (aFd == 0) {
+ return;
+ }
+ char buf[256];
+ CheckedIncrement<char*> b(buf, sizeof(buf));
+ CheckedIncrement<const char*> f(aFormat, strlen(aFormat) + 1);
+ va_list ap;
+ va_start(ap, aFormat);
+ while (true) {
+ switch (*f) {
+ case '\0':
+ goto out;
+
+ case '%': {
+ // The start of the format specifier is used if this specifier is
+ // invalid.
+ const char* start = f;
+
+ // Read the field width
+ f++;
+ char* end = nullptr;
+ size_t width = strtoul(f, &end, 10);
+ // If strtol can't find a number that's okay, that means 0 in our
+ // case, but we must advance f).
+ f.advance(end);
+
+ switch (*f) {
+ case 'z': {
+ if (*(++f) == 'u') {
+ size_t i = va_arg(ap, size_t);
+
+ size_t num_digits = NumDigits(i);
+ LeftPad(b, width > num_digits ? width - num_digits : 0);
+ WriteDigits(b, i, num_digits);
+ } else {
+ // If the format specifier is unknown then write out '%' and
+ // rewind to the beginning of the specifier causing it to be
+ // printed normally.
+ *(b++) = '%';
+ f.rewind(start);
+ }
+ break;
+ }
+
+ case 'p': {
+ intptr_t ptr = va_arg(ap, intptr_t);
+ *(b++) = '0';
+ *(b++) = 'x';
+ int x = sizeof(intptr_t) * 8;
+ bool wrote_msb = false;
+ do {
+ x -= 4;
+ size_t hex_digit = ptr >> x & 0xf;
+ if (hex_digit || wrote_msb) {
+ *(b++) = "0123456789abcdef"[hex_digit];
+ wrote_msb = true;
+ }
+ } while (x > 0);
+ if (!wrote_msb) {
+ *(b++) = '0';
+ }
+ break;
+ }
+
+ case 's': {
+ const char* str = va_arg(ap, const char*);
+ size_t len = strlen(str);
+
+ LeftPad(b, width > len ? width - len : 0);
+
+ while (*str) {
+ *(b++) = *(str++);
+ }
+
+ break;
+ }
+
+ case '%':
+ // Print a single raw '%'.
+ *(b++) = '%';
+ break;
+
+ default:
+ // If the format specifier is unknown then write out '%' and
+ // rewind to the beginning of the specifier causing it to be
+ // printed normally.
+ *(b++) = '%';
+ f.rewind(start);
+ break;
+ }
+ break;
+ }
+ default:
+ *(b++) = *f;
+ break;
+ }
+ f++;
+ }
+out:
+#ifdef _WIN32
+ // See comment in FdPrintf.h as to why WriteFile is used.
+ DWORD written;
+ WriteFile(reinterpret_cast<HANDLE>(aFd), buf, b - buf, &written, nullptr);
+#else
+ MOZ_UNUSED(write(aFd, buf, b - buf));
+#endif
+ va_end(ap);
+}
diff --git a/memory/replace/logalloc/FdPrintf.h b/memory/replace/logalloc/FdPrintf.h
new file mode 100644
index 0000000000..f390d57ed5
--- /dev/null
+++ b/memory/replace/logalloc/FdPrintf.h
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __FdPrintf_h__
+#define __FdPrintf_h__
+
+/* We can't use libc's (f)printf because it would reenter in replace_malloc,
+ * So use a custom and simplified version. Only %p, %zu, %s and %% are
+ * supported, %zu, %s, support width specifiers.
+ *
+ * /!\ This function used a fixed-size internal buffer. The caller is
+ * expected to not use a format string that may overflow.
+ * The aFd argument is a file descriptor on UNIX and a native win32 file
+ * handle on Windows (from CreateFile). We can't use the windows POSIX
+ * APIs is that they don't support O_APPEND in a multi-process-safe way,
+ * while CreateFile does.
+ */
+extern void FdPrintf(intptr_t aFd, const char* aFormat, ...)
+#ifdef __GNUC__
+ __attribute__((format(printf, 2, 3)))
+#endif
+ ;
+
+#endif /* __FdPrintf_h__ */
diff --git a/memory/replace/logalloc/LogAlloc.cpp b/memory/replace/logalloc/LogAlloc.cpp
new file mode 100644
index 0000000000..a976b0c674
--- /dev/null
+++ b/memory/replace/logalloc/LogAlloc.cpp
@@ -0,0 +1,238 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <cstdlib>
+#include <fcntl.h>
+
+#ifdef _WIN32
+# include <windows.h>
+# include <io.h>
+# include <process.h>
+#else
+# include <unistd.h>
+# include <pthread.h>
+#endif
+
+#include "replace_malloc.h"
+#include "FdPrintf.h"
+#include "Mutex.h"
+
+static malloc_table_t sFuncs;
+static intptr_t sFd = 0;
+static bool sStdoutOrStderr = false;
+
+static Mutex sMutex MOZ_UNANNOTATED;
+
+#ifndef _WIN32
+static void prefork() MOZ_NO_THREAD_SAFETY_ANALYSIS { sMutex.Lock(); }
+static void postfork_parent() MOZ_NO_THREAD_SAFETY_ANALYSIS { sMutex.Unlock(); }
+static void postfork_child() { sMutex.Init(); }
+#endif
+
+static size_t GetPid() { return size_t(getpid()); }
+
+static size_t GetTid() {
+#if defined(_WIN32)
+ return size_t(GetCurrentThreadId());
+#else
+ return size_t(pthread_self());
+#endif
+}
+
+#ifdef ANDROID
+/* Android doesn't have pthread_atfork defined in pthread.h */
+extern "C" MOZ_EXPORT int pthread_atfork(void (*)(void), void (*)(void),
+ void (*)(void));
+#endif
+
+class LogAllocBridge : public ReplaceMallocBridge {
+ virtual void InitDebugFd(mozilla::DebugFdRegistry& aRegistry) override {
+ if (!sStdoutOrStderr) {
+ aRegistry.RegisterHandle(sFd);
+ }
+ }
+};
+
+/* Do a simple, text-form, log of all calls to replace-malloc functions.
+ * Use locking to guarantee that an allocation that did happen is logged
+ * before any other allocation/free happens.
+ */
+
+static void* replace_malloc(size_t aSize) {
+ MutexAutoLock lock(sMutex);
+ void* ptr = sFuncs.malloc(aSize);
+ FdPrintf(sFd, "%zu %zu malloc(%zu)=%p\n", GetPid(), GetTid(), aSize, ptr);
+ return ptr;
+}
+
+static int replace_posix_memalign(void** aPtr, size_t aAlignment,
+ size_t aSize) {
+ MutexAutoLock lock(sMutex);
+ int ret = sFuncs.posix_memalign(aPtr, aAlignment, aSize);
+ FdPrintf(sFd, "%zu %zu posix_memalign(%zu,%zu)=%p\n", GetPid(), GetTid(),
+ aAlignment, aSize, (ret == 0) ? *aPtr : nullptr);
+ return ret;
+}
+
+static void* replace_aligned_alloc(size_t aAlignment, size_t aSize) {
+ MutexAutoLock lock(sMutex);
+ void* ptr = sFuncs.aligned_alloc(aAlignment, aSize);
+ FdPrintf(sFd, "%zu %zu aligned_alloc(%zu,%zu)=%p\n", GetPid(), GetTid(),
+ aAlignment, aSize, ptr);
+ return ptr;
+}
+
+static void* replace_calloc(size_t aNum, size_t aSize) {
+ MutexAutoLock lock(sMutex);
+ void* ptr = sFuncs.calloc(aNum, aSize);
+ FdPrintf(sFd, "%zu %zu calloc(%zu,%zu)=%p\n", GetPid(), GetTid(), aNum, aSize,
+ ptr);
+ return ptr;
+}
+
+static void* replace_realloc(void* aPtr, size_t aSize) {
+ MutexAutoLock lock(sMutex);
+ void* new_ptr = sFuncs.realloc(aPtr, aSize);
+ FdPrintf(sFd, "%zu %zu realloc(%p,%zu)=%p\n", GetPid(), GetTid(), aPtr, aSize,
+ new_ptr);
+ return new_ptr;
+}
+
+static void replace_free(void* aPtr) {
+ MutexAutoLock lock(sMutex);
+ FdPrintf(sFd, "%zu %zu free(%p)\n", GetPid(), GetTid(), aPtr);
+ sFuncs.free(aPtr);
+}
+
+static void* replace_memalign(size_t aAlignment, size_t aSize) {
+ MutexAutoLock lock(sMutex);
+ void* ptr = sFuncs.memalign(aAlignment, aSize);
+ FdPrintf(sFd, "%zu %zu memalign(%zu,%zu)=%p\n", GetPid(), GetTid(),
+ aAlignment, aSize, ptr);
+ return ptr;
+}
+
+static void* replace_valloc(size_t aSize) {
+ MutexAutoLock lock(sMutex);
+ void* ptr = sFuncs.valloc(aSize);
+ FdPrintf(sFd, "%zu %zu valloc(%zu)=%p\n", GetPid(), GetTid(), aSize, ptr);
+ return ptr;
+}
+
+static void replace_jemalloc_stats(jemalloc_stats_t* aStats,
+ jemalloc_bin_stats_t* aBinStats) {
+ MutexAutoLock lock(sMutex);
+ sFuncs.jemalloc_stats_internal(aStats, aBinStats);
+ FdPrintf(sFd, "%zu %zu jemalloc_stats()\n", GetPid(), GetTid());
+}
+
+void replace_init(malloc_table_t* aTable, ReplaceMallocBridge** aBridge) {
+ /* Initialize output file descriptor from the MALLOC_LOG environment
+ * variable. Numbers up to 9999 are considered as a preopened file
+ * descriptor number. Other values are considered as a file name. */
+#ifdef _WIN32
+ wchar_t* log = _wgetenv(L"MALLOC_LOG");
+#else
+ char* log = getenv("MALLOC_LOG");
+#endif
+ if (log && *log) {
+ int fd = 0;
+ const auto* fd_num = log;
+ while (*fd_num) {
+ /* Reject non digits. */
+ if (*fd_num < '0' || *fd_num > '9') {
+ fd = -1;
+ break;
+ }
+ fd = fd * 10 + (*fd_num - '0');
+ /* Reject values >= 10000. */
+ if (fd >= 10000) {
+ fd = -1;
+ break;
+ }
+ fd_num++;
+ }
+ if (fd == 1 || fd == 2) {
+ sStdoutOrStderr = true;
+ }
+#ifdef _WIN32
+ // See comment in FdPrintf.h as to why CreateFile is used.
+ HANDLE handle;
+ if (fd > 0) {
+ handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
+ } else {
+ handle =
+ CreateFileW(log, FILE_APPEND_DATA, FILE_SHARE_READ | FILE_SHARE_WRITE,
+ nullptr, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
+ }
+ if (handle != INVALID_HANDLE_VALUE) {
+ sFd = reinterpret_cast<intptr_t>(handle);
+ }
+#else
+ if (fd == -1) {
+ fd = open(log, O_WRONLY | O_CREAT | O_APPEND, 0644);
+ }
+ if (fd > 0) {
+ sFd = fd;
+ }
+#endif
+ }
+
+ // Don't initialize if we weren't passed a valid MALLOC_LOG.
+ if (sFd == 0) {
+ return;
+ }
+
+ sMutex.Init();
+ static LogAllocBridge bridge;
+ sFuncs = *aTable;
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
+#define MALLOC_DECL(name, ...) aTable->name = replace_##name;
+#include "malloc_decls.h"
+ aTable->jemalloc_stats_internal = replace_jemalloc_stats;
+ if (!getenv("MALLOC_LOG_MINIMAL")) {
+ aTable->posix_memalign = replace_posix_memalign;
+ aTable->aligned_alloc = replace_aligned_alloc;
+ aTable->valloc = replace_valloc;
+ }
+ *aBridge = &bridge;
+
+#ifndef _WIN32
+ /* When another thread has acquired a lock before forking, the child
+ * process will inherit the lock state but the thread, being nonexistent
+ * in the child process, will never release it, leading to a dead-lock
+ * whenever the child process gets the lock. We thus need to ensure no
+ * other thread is holding the lock before forking, by acquiring it
+ * ourselves, and releasing it after forking in the parent process and
+ * resetting it to its initial state in the child process. The latter is
+ * important because some implementations (notably macOS) prevent a lock from
+ * being unlocked by a different thread than the one which locked it in the
+ * first place.
+ * Windows doesn't have this problem since there is no fork().
+ * The real allocator, however, might be doing the same thing (jemalloc
+ * does). But pthread_atfork `prepare` handlers (first argument) are
+ * processed in reverse order they were established. But replace_init
+ * runs before the real allocator has had any chance to initialize and
+ * call pthread_atfork itself. This leads to its prefork running before
+ * ours. This leads to a race condition that can lead to a deadlock like
+ * the following:
+ * - thread A forks.
+ * - libc calls real allocator's prefork, so thread A holds the real
+ * allocator lock.
+ * - thread B calls malloc, which calls our replace_malloc.
+ * - consequently, thread B holds our lock.
+ * - thread B then proceeds to call the real allocator's malloc, and
+ * waits for the real allocator's lock, which thread A holds.
+ * - libc calls our prefork, so thread A waits for our lock, which
+ * thread B holds.
+ * To avoid this race condition, the real allocator's prefork must be
+ * called after ours, which means it needs to be registered before ours.
+ * So trick the real allocator into initializing itself without more side
+ * effects by calling malloc with a size it can't possibly allocate. */
+ sFuncs.malloc(-1);
+ pthread_atfork(prefork, postfork_parent, postfork_child);
+#endif
+}
diff --git a/memory/replace/logalloc/README b/memory/replace/logalloc/README
new file mode 100644
index 0000000000..c2e8cf66ce
--- /dev/null
+++ b/memory/replace/logalloc/README
@@ -0,0 +1,95 @@
+Logalloc is a replace-malloc library for Firefox (see
+memory/build/replace_malloc.h) that dumps a log of memory allocations to a
+given file descriptor or file name. That log can then be replayed against
+Firefox's default memory allocator independently or through another
+replace-malloc library, allowing the testing of other allocators under the
+exact same workload.
+
+To get an allocation log the following environment variable when starting
+Firefox:
+ MALLOC_LOG=/path/to/log-file
+ or
+ MALLOC_LOG=number
+
+When MALLOC_LOG is a number below 10000, it is considered as a file
+descriptor number that is fed to Firefox when it is started. Otherwise,
+it is considered as a file name.
+
+As those allocation logs can grow large quite quickly, it can be useful
+to pipe the output to a compression tool.
+
+MALLOC_LOG=1 would send to Firefox's stdout, MALLOC_LOG=2 would send to
+its stderr. Since in both cases that could be mixed with other output
+from Firefox, it is usually better to use another file descriptor
+by shell redirections, such as:
+
+ MALLOC_LOG=3 firefox 3>&1 1>&2 | gzip -c > log.gz
+
+(3>&1 copies the `| gzip` pipe file descriptor to file descriptor #3, 1>&2
+then copies stderr to stdout. This leads to: fd1 and fd2 sending to stderr
+of the parent process (the shell), and fd3 sending to gzip.)
+
+Each line of the allocations log is formatted as follows:
+ <pid> <tid> <function>([<args>])[=<result>]
+where <args> is a comma separated list of values. The number of <args> and
+the presence of <result> depend on the <function>.
+
+Example log:
+ 18545 18545 malloc(32)=0x7f90495120e0
+ 18545 18545 calloc(1,148)=0x7f9049537480
+ 18545 18545 realloc(0x7f90495120e0,64)=0x7f9049536680
+ 18545 18545 posix_memalign(256,240)=0x7f9049583300
+ 18545 18545 jemalloc_stats()
+ 18545 18545 free(0x7f9049536680)
+
+This log can be replayed with the logalloc-replay tool in
+memory/replace/logalloc/replay. However, as the goal of that tool is to
+reproduce the recorded memory allocations, it needs to avoid as much as
+possible doing its own allocations for bookkeeping. Reading the logs as
+they are would require data structures and memory allocations. As a
+consequence, the logs need to be preprocessed beforehand.
+
+The logalloc_munge.py script is responsible for that preprocessing. It simply
+takes a raw log on its stdin, and outputs the preprocessed log on its stdout.
+It replaces pointer addresses with indexes the logalloc-replay tool can use
+in a large (almost) linear array of allocation tracking slots (prefixed with
+'#'). It also replaces the pids with numbers starting from 1 (such as the
+first seen pid number is 1, the second is 2, etc.).
+
+The above example log would become the following, once preprocessed:
+ 1 1 malloc(32)=#1
+ 1 1 calloc(1,148)=#2
+ 1 1 realloc(#1,64)=#1
+ 1 1 posix_memalign(256,240)=#3
+ 1 1 jemalloc_stats()
+ 1 1 free(#1)
+
+The logalloc-replay tool then takes the preprocessed log on its stdin and
+replays the allocations printed there, but will only replay those with the
+same process id as the first line (which normally is 1).
+
+As the log files are simple text files, though, it is easy to separate out
+the different processes log with e.g. grep, and feed the separate processes
+logs to logalloc-replay.
+
+The logalloc-replay program won't output anything unless jemalloc_stats
+records appears in the log. You can expect those to be recorded when going
+to about:memory in Firefox, but they can also be added after preprocessing.
+
+Here is an example of what one can do:
+
+ gunzip -c log.gz | python logalloc_munge.py | \
+ awk '$1 == "2" { print $0 } !(NR % 10000) { print "2 1 jemalloc_stats()" }' | \
+ ./logalloc-replay
+
+The above command replays the allocations of process #2, with some stats
+output every 10000 records.
+
+The logalloc-replay tool itself being hooked with replace-malloc, it is possible
+to set LD_PRELOAD/DYLD_INSERT_LIBRARIES/MOZ_REPLACE_MALLOC_LIB and replay a log
+through a different allocator. For example:
+
+ LD_PRELOAD=libreplace_jemalloc.so logalloc-replay < log
+
+Will replay the log against jemalloc4 (which is, as of writing, what
+libreplace_jemalloc.so contains).
diff --git a/memory/replace/logalloc/moz.build b/memory/replace/logalloc/moz.build
new file mode 100644
index 0000000000..c52d9e69e0
--- /dev/null
+++ b/memory/replace/logalloc/moz.build
@@ -0,0 +1,30 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+ReplaceMalloc("logalloc")
+
+SOURCES += [
+ "FdPrintf.cpp",
+ "LogAlloc.cpp",
+]
+
+DisableStlWrapping()
+NO_PGO = True
+DEFINES["MOZ_NO_MOZALLOC"] = True
+
+LOCAL_INCLUDES += [
+ "/memory/build",
+]
+
+# Android doesn't have pthread_atfork, but we have our own in mozglue.
+if CONFIG["OS_TARGET"] == "Android" and FORCE_SHARED_LIB:
+ USE_LIBS += [
+ "mozglue",
+ ]
+
+DIRS += [
+ "replay",
+]
diff --git a/memory/replace/logalloc/replay/Makefile.in b/memory/replace/logalloc/replay/Makefile.in
new file mode 100644
index 0000000000..73659add98
--- /dev/null
+++ b/memory/replace/logalloc/replay/Makefile.in
@@ -0,0 +1,48 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+ifdef MOZ_CODE_COVERAGE
+SKIP = 1
+endif
+
+ifdef CROSS_COMPILE
+SKIP = 1
+endif
+
+ifneq ($(SKIP),1)
+
+ifeq ($(OS_TARGET),WINNT)
+LOGALLOC_VAR = MOZ_REPLACE_MALLOC_LIB
+else
+ifeq ($(OS_TARGET),Darwin)
+LOGALLOC_VAR = DYLD_INSERT_LIBRARIES
+else
+LOGALLOC_VAR = LD_PRELOAD
+endif
+endif
+
+ifndef MOZ_REPLACE_MALLOC_STATIC
+LOGALLOC = $(LOGALLOC_VAR)=$(CURDIR)/../$(DLL_PREFIX)logalloc$(DLL_SUFFIX)
+endif
+
+expected_output.log: $(srcdir)/replay.log
+# The logalloc-replay program will only replay entries from the first pid,
+# so the expected output only contains entries beginning with "1 "
+ grep "^1 " $< > $@
+
+check:: $(srcdir)/replay.log expected_output.log $(srcdir)/expected_output_minimal.log
+# Test with MALLOC_LOG as a file descriptor number
+# We filter out anything happening before the first jemalloc_stats (first
+# command in replay.log) because starting with libstdc++ 5, a static
+# initializer in the STL allocates memory, which we obviously don't have
+# in expected_output.log.
+ MALLOC_LOG=1 $(LOGALLOC) ./$(PROGRAM) < $< | sed -n '/jemalloc_stats/,$$p' | $(PYTHON3) $(srcdir)/logalloc_munge.py | diff -w - expected_output.log
+# Test with MALLOC_LOG as a file name
+ $(RM) test_output.log
+ MALLOC_LOG=test_output.log $(LOGALLOC) ./$(PROGRAM) < $<
+ sed -n '/jemalloc_stats/,$$p' test_output.log | $(PYTHON3) $(srcdir)/logalloc_munge.py | diff -w - expected_output.log
+
+ MALLOC_LOG=1 MALLOC_LOG_MINIMAL=1 $(LOGALLOC) ./$(PROGRAM) < $< | sed -n '/jemalloc_stats/,$$p' | $(PYTHON3) $(srcdir)/logalloc_munge.py | diff -w - $(srcdir)/expected_output_minimal.log
+
+endif
diff --git a/memory/replace/logalloc/replay/Replay.cpp b/memory/replace/logalloc/replay/Replay.cpp
new file mode 100644
index 0000000000..b5ad0c540e
--- /dev/null
+++ b/memory/replace/logalloc/replay/Replay.cpp
@@ -0,0 +1,1159 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define MOZ_MEMORY_IMPL
+#include "mozmemory_wrap.h"
+
+#ifdef _WIN32
+# include <windows.h>
+# include <io.h>
+typedef intptr_t ssize_t;
+#else
+# include <sys/mman.h>
+# include <unistd.h>
+#endif
+#ifdef XP_LINUX
+# include <fcntl.h>
+# include <stdlib.h>
+#endif
+#include <algorithm>
+#include <cmath>
+#include <cstdio>
+#include <cstring>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/MathAlgorithms.h"
+#include "mozilla/Maybe.h"
+#include "FdPrintf.h"
+
+using namespace mozilla;
+
+static void die(const char* message) {
+ /* Here, it doesn't matter that fprintf may allocate memory. */
+ fprintf(stderr, "%s\n", message);
+ exit(1);
+}
+
+#ifdef XP_LINUX
+static size_t sPageSize = []() { return sysconf(_SC_PAGESIZE); }();
+#endif
+
+/* We don't want to be using malloc() to allocate our internal tracking
+ * data, because that would change the parameters of what is being measured,
+ * so we want to use data types that directly use mmap/VirtualAlloc. */
+template <typename T, size_t Len>
+class MappedArray {
+ public:
+ MappedArray() : mPtr(nullptr) {
+#ifdef XP_LINUX
+ MOZ_RELEASE_ASSERT(!((sizeof(T) * Len) & (sPageSize - 1)),
+ "MappedArray size must be a multiple of the page size");
+#endif
+ }
+
+ ~MappedArray() {
+ if (mPtr) {
+#ifdef _WIN32
+ VirtualFree(mPtr, sizeof(T) * Len, MEM_RELEASE);
+#elif defined(XP_LINUX)
+ munmap(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(mPtr) -
+ sPageSize),
+ sizeof(T) * Len + sPageSize * 2);
+#else
+ munmap(mPtr, sizeof(T) * Len);
+#endif
+ }
+ }
+
+ T& operator[](size_t aIndex) const {
+ if (mPtr) {
+ return mPtr[aIndex];
+ }
+
+#ifdef _WIN32
+ mPtr = reinterpret_cast<T*>(VirtualAlloc(
+ nullptr, sizeof(T) * Len, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE));
+ if (mPtr == nullptr) {
+ die("VirtualAlloc error");
+ }
+#else
+ size_t data_size = sizeof(T) * Len;
+ size_t size = data_size;
+# ifdef XP_LINUX
+ // See below
+ size += sPageSize * 2;
+# endif
+ mPtr = reinterpret_cast<T*>(mmap(nullptr, size, PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_PRIVATE, -1, 0));
+ if (mPtr == MAP_FAILED) {
+ die("Mmap error");
+ }
+# ifdef XP_LINUX
+ // On Linux we request a page on either side of the allocation and
+ // mprotect them. This prevents mappings in /proc/self/smaps from being
+ // merged and allows us to parse this file to calculate the allocator's RSS.
+ MOZ_ASSERT(0 == mprotect(mPtr, sPageSize, 0));
+ MOZ_ASSERT(0 == mprotect(reinterpret_cast<void*>(
+ reinterpret_cast<uintptr_t>(mPtr) + data_size +
+ sPageSize),
+ sPageSize, 0));
+ mPtr = reinterpret_cast<T*>(reinterpret_cast<uintptr_t>(mPtr) + sPageSize);
+# endif
+#endif
+ return mPtr[aIndex];
+ }
+
+ bool ownsMapping(uintptr_t addr) const { return addr == (uintptr_t)mPtr; }
+
+ bool allocated() const { return !!mPtr; }
+
+ private:
+ mutable T* mPtr;
+};
+
+/* Type for records of allocations. */
+struct MemSlot {
+ void* mPtr;
+
+ // mRequest is only valid if mPtr is non-null. It doesn't need to be cleared
+ // when memory is freed or realloc()ed.
+ size_t mRequest;
+};
+
+/* An almost infinite list of slots.
+ * In essence, this is a linked list of arrays of groups of slots.
+ * Each group is 1MB. On 64-bits, one group allows to store 64k allocations.
+ * Each MemSlotList instance can store 1023 such groups, which means more
+ * than 67M allocations. In case more would be needed, we chain to another
+ * MemSlotList, and so on.
+ * Using 1023 groups makes the MemSlotList itself page sized on 32-bits
+ * and 2 pages-sized on 64-bits.
+ */
+class MemSlotList {
+ static constexpr size_t kGroups = 1024 - 1;
+ static constexpr size_t kGroupSize = (1024 * 1024) / sizeof(MemSlot);
+
+ MappedArray<MemSlot, kGroupSize> mSlots[kGroups];
+ MappedArray<MemSlotList, 1> mNext;
+
+ public:
+ MemSlot& operator[](size_t aIndex) const {
+ if (aIndex < kGroupSize * kGroups) {
+ return mSlots[aIndex / kGroupSize][aIndex % kGroupSize];
+ }
+ aIndex -= kGroupSize * kGroups;
+ return mNext[0][aIndex];
+ }
+
+ // Ask if any of the memory-mapped buffers use this range.
+ bool ownsMapping(uintptr_t aStart) const {
+ for (const auto& slot : mSlots) {
+ if (slot.allocated() && slot.ownsMapping(aStart)) {
+ return true;
+ }
+ }
+ return mNext.ownsMapping(aStart) ||
+ (mNext.allocated() && mNext[0].ownsMapping(aStart));
+ }
+};
+
+/* Helper class for memory buffers */
+class Buffer {
+ public:
+ Buffer() : mBuf(nullptr), mLength(0) {}
+
+ Buffer(const void* aBuf, size_t aLength)
+ : mBuf(reinterpret_cast<const char*>(aBuf)), mLength(aLength) {}
+
+ /* Constructor for string literals. */
+ template <size_t Size>
+ explicit Buffer(const char (&aStr)[Size]) : mBuf(aStr), mLength(Size - 1) {}
+
+ /* Returns a sub-buffer up-to but not including the given aNeedle character.
+ * The "parent" buffer itself is altered to begin after the aNeedle
+ * character.
+ * If the aNeedle character is not found, return the entire buffer, and empty
+ * the "parent" buffer. */
+ Buffer SplitChar(char aNeedle) {
+ char* buf = const_cast<char*>(mBuf);
+ char* c = reinterpret_cast<char*>(memchr(buf, aNeedle, mLength));
+ if (!c) {
+ return Split(mLength);
+ }
+
+ Buffer result = Split(c - buf);
+ // Remove the aNeedle character itself.
+ Split(1);
+ return result;
+ }
+
+ // Advance to the position after aNeedle. This is like SplitChar but does not
+ // return the skipped portion.
+ void Skip(char aNeedle, unsigned nTimes = 1) {
+ for (unsigned i = 0; i < nTimes; i++) {
+ SplitChar(aNeedle);
+ }
+ }
+
+ void SkipWhitespace() {
+ while (mLength > 0) {
+ if (!IsSpace(mBuf[0])) {
+ break;
+ }
+ mBuf++;
+ mLength--;
+ }
+ }
+
+ static bool IsSpace(char c) {
+ switch (c) {
+ case ' ':
+ case '\t':
+ case '\n':
+ case '\v':
+ case '\f':
+ case '\r':
+ return true;
+ }
+ return false;
+ }
+
+ /* Returns a sub-buffer of at most aLength characters. The "parent" buffer is
+ * amputated of those aLength characters. If the "parent" buffer is smaller
+ * than aLength, then its length is used instead. */
+ Buffer Split(size_t aLength) {
+ Buffer result(mBuf, std::min(aLength, mLength));
+ mLength -= result.mLength;
+ mBuf += result.mLength;
+ return result;
+ }
+
+ /* Move the buffer (including its content) to the memory address of the aOther
+ * buffer. */
+ void Slide(Buffer aOther) {
+ memmove(const_cast<char*>(aOther.mBuf), mBuf, mLength);
+ mBuf = aOther.mBuf;
+ }
+
+ /* Returns whether the two involved buffers have the same content. */
+ bool operator==(Buffer aOther) {
+ return mLength == aOther.mLength &&
+ (mBuf == aOther.mBuf || !strncmp(mBuf, aOther.mBuf, mLength));
+ }
+
+ bool operator!=(Buffer aOther) { return !(*this == aOther); }
+
+ /* Returns true if the buffer is not empty. */
+ explicit operator bool() { return mLength; }
+
+ char operator[](size_t n) const { return mBuf[n]; }
+
+ /* Returns the memory location of the buffer. */
+ const char* get() { return mBuf; }
+
+ /* Returns the memory location of the end of the buffer (technically, the
+ * first byte after the buffer). */
+ const char* GetEnd() { return mBuf + mLength; }
+
+ /* Extend the buffer over the content of the other buffer, assuming it is
+ * adjacent. */
+ void Extend(Buffer aOther) {
+ MOZ_ASSERT(aOther.mBuf == GetEnd());
+ mLength += aOther.mLength;
+ }
+
+ size_t Length() const { return mLength; }
+
+ private:
+ const char* mBuf;
+ size_t mLength;
+};
+
+/* Helper class to read from a file descriptor line by line. */
+class FdReader {
+ public:
+ explicit FdReader(int aFd, bool aNeedClose = false)
+ : mFd(aFd),
+ mNeedClose(aNeedClose),
+ mData(&mRawBuf, 0),
+ mBuf(&mRawBuf, sizeof(mRawBuf)) {}
+
+ FdReader(FdReader&& aOther) noexcept
+ : mFd(aOther.mFd),
+ mNeedClose(aOther.mNeedClose),
+ mData(&mRawBuf, 0),
+ mBuf(&mRawBuf, sizeof(mRawBuf)) {
+ memcpy(mRawBuf, aOther.mRawBuf, sizeof(mRawBuf));
+ aOther.mFd = -1;
+ aOther.mNeedClose = false;
+ aOther.mData = Buffer();
+ aOther.mBuf = Buffer();
+ }
+
+ FdReader& operator=(const FdReader&) = delete;
+ FdReader(const FdReader&) = delete;
+
+ ~FdReader() {
+ if (mNeedClose) {
+ close(mFd);
+ }
+ }
+
+ /* Read a line from the file descriptor and returns it as a Buffer instance */
+ Buffer ReadLine() {
+ while (true) {
+ Buffer result = mData.SplitChar('\n');
+
+ /* There are essentially three different cases here:
+ * - '\n' was found "early". In this case, the end of the result buffer
+ * is before the beginning of the mData buffer (since SplitChar
+ * amputated it).
+ * - '\n' was found as the last character of mData. In this case, mData
+ * is empty, but still points at the end of mBuf. result points to what
+ * used to be in mData, without the last character.
+ * - '\n' was not found. In this case too, mData is empty and points at
+ * the end of mBuf. But result points to the entire buffer that used to
+ * be pointed by mData.
+ * Only in the latter case do both result and mData's end match, and it's
+ * the only case where we need to refill the buffer.
+ */
+ if (result.GetEnd() != mData.GetEnd()) {
+ return result;
+ }
+
+ /* Since SplitChar emptied mData, make it point to what it had before. */
+ mData = result;
+
+ /* And move it to the beginning of the read buffer. */
+ mData.Slide(mBuf);
+
+ FillBuffer();
+
+ if (!mData) {
+ return Buffer();
+ }
+ }
+ }
+
+ private:
+ /* Fill the read buffer. */
+ void FillBuffer() {
+ size_t size = mBuf.GetEnd() - mData.GetEnd();
+ Buffer remainder(mData.GetEnd(), size);
+
+ ssize_t len = 1;
+ while (remainder && len > 0) {
+ len = ::read(mFd, const_cast<char*>(remainder.get()), size);
+ if (len < 0) {
+ die("Read error");
+ }
+ size -= len;
+ mData.Extend(remainder.Split(len));
+ }
+ }
+
+ /* File descriptor to read from. */
+ int mFd;
+ bool mNeedClose;
+
+ /* Part of data that was read from the file descriptor but not returned with
+ * ReadLine yet. */
+ Buffer mData;
+ /* Buffer representation of mRawBuf */
+ Buffer mBuf;
+ /* read() buffer */
+ char mRawBuf[4096];
+};
+
+MOZ_BEGIN_EXTERN_C
+
+/* Function declarations for all the replace_malloc _impl functions.
+ * See memory/build/replace_malloc.c */
+#define MALLOC_DECL(name, return_type, ...) \
+ return_type name##_impl(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+#include "malloc_decls.h"
+
+#define MALLOC_DECL(name, return_type, ...) return_type name(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_JEMALLOC
+#include "malloc_decls.h"
+
+#ifdef ANDROID
+
+/* mozjemalloc and jemalloc use pthread_atfork, which Android doesn't have.
+ * While gecko has one in libmozglue, the replay program can't use that.
+ * Since we're not going to fork anyways, make it a dummy function. */
+int pthread_atfork(void (*aPrepare)(void), void (*aParent)(void),
+ void (*aChild)(void)) {
+ return 0;
+}
+#endif
+
+MOZ_END_EXTERN_C
+
+template <unsigned Base = 10>
+size_t parseNumber(Buffer aBuf) {
+ if (!aBuf) {
+ die("Malformed input");
+ }
+
+ size_t result = 0;
+ for (const char *c = aBuf.get(), *end = aBuf.GetEnd(); c < end; c++) {
+ result *= Base;
+ if ((*c >= '0' && *c <= '9')) {
+ result += *c - '0';
+ } else if (Base == 16 && *c >= 'a' && *c <= 'f') {
+ result += *c - 'a' + 10;
+ } else if (Base == 16 && *c >= 'A' && *c <= 'F') {
+ result += *c - 'A' + 10;
+ } else {
+ die("Malformed input");
+ }
+ }
+ return result;
+}
+
+static size_t percent(size_t a, size_t b) {
+ if (!b) {
+ return 0;
+ }
+ return size_t(round(double(a) / double(b) * 100.0));
+}
+
+class Distribution {
+ public:
+ // Default constructor used for array initialisation.
+ Distribution()
+ : mMaxSize(0),
+ mNextSmallest(0),
+ mShift(0),
+ mArrayOffset(0),
+ mArraySlots(0),
+ mTotalRequests(0),
+ mRequests{0} {}
+
+ Distribution(size_t max_size, size_t next_smallest, size_t bucket_size)
+ : mMaxSize(max_size),
+ mNextSmallest(next_smallest),
+ mShift(CeilingLog2(bucket_size)),
+ mArrayOffset(1 + next_smallest),
+ mArraySlots((max_size - next_smallest) >> mShift),
+ mTotalRequests(0),
+ mRequests{
+ 0,
+ } {
+ MOZ_ASSERT(mMaxSize);
+ MOZ_RELEASE_ASSERT(mArraySlots <= MAX_NUM_BUCKETS);
+ }
+
+ Distribution& operator=(const Distribution& aOther) = default;
+
+ void addRequest(size_t request) {
+ MOZ_ASSERT(mMaxSize);
+
+ mRequests[(request - mArrayOffset) >> mShift]++;
+ mTotalRequests++;
+ }
+
+ void printDist(intptr_t std_err) {
+ MOZ_ASSERT(mMaxSize);
+
+ // The translation to turn a slot index into a memory request size.
+ const size_t array_offset_add = (1 << mShift) + mNextSmallest;
+
+ FdPrintf(std_err, "\n%zu-bin Distribution:\n", mMaxSize);
+ FdPrintf(std_err, " request : count percent\n");
+ size_t range_start = mNextSmallest + 1;
+ for (size_t j = 0; j < mArraySlots; j++) {
+ size_t range_end = (j << mShift) + array_offset_add;
+ FdPrintf(std_err, "%5zu - %5zu: %6zu %6zu%%\n", range_start, range_end,
+ mRequests[j], percent(mRequests[j], mTotalRequests));
+ range_start = range_end + 1;
+ }
+ }
+
+ size_t maxSize() const { return mMaxSize; }
+
+ private:
+ static constexpr size_t MAX_NUM_BUCKETS = 16;
+
+ // If size is zero this distribution is uninitialised.
+ size_t mMaxSize;
+ size_t mNextSmallest;
+
+ // Parameters to convert a size into a slot number.
+ unsigned mShift;
+ unsigned mArrayOffset;
+
+ // The number of slots.
+ unsigned mArraySlots;
+
+ size_t mTotalRequests;
+ size_t mRequests[MAX_NUM_BUCKETS];
+};
+
+#ifdef XP_LINUX
+struct MemoryMap {
+ uintptr_t mStart;
+ uintptr_t mEnd;
+ bool mReadable;
+ bool mPrivate;
+ bool mAnon;
+ bool mIsStack;
+ bool mIsSpecial;
+ size_t mRSS;
+
+ bool IsCandidate() const {
+ // Candidates mappings are:
+ // * anonymous
+ // * they are private (not shared),
+ // * anonymous or "[heap]" (not another area such as stack),
+ //
+ // The only mappings we're falsely including are the .bss segments for
+ // shared libraries.
+ return mReadable && mPrivate && mAnon && !mIsStack && !mIsSpecial;
+ }
+};
+
+class SMapsReader : private FdReader {
+ private:
+ explicit SMapsReader(FdReader&& reader) : FdReader(std::move(reader)) {}
+
+ public:
+ static Maybe<SMapsReader> open() {
+ int fd = ::open(FILENAME, O_RDONLY);
+ if (fd < 0) {
+ perror(FILENAME);
+ return mozilla::Nothing();
+ }
+
+ return Some(SMapsReader(FdReader(fd, true)));
+ }
+
+ Maybe<MemoryMap> readMap(intptr_t aStdErr) {
+ // This is not very tolerant of format changes because things like
+ // parseNumber will crash if they get a bad value. TODO: make this
+ // soft-fail.
+
+ Buffer line = ReadLine();
+ if (!line) {
+ return Nothing();
+ }
+
+ // We're going to be at the start of an entry, start tokenising the first
+ // line.
+
+ // Range
+ Buffer range = line.SplitChar(' ');
+ uintptr_t range_start = parseNumber<16>(range.SplitChar('-'));
+ uintptr_t range_end = parseNumber<16>(range);
+
+ // Mode.
+ Buffer mode = line.SplitChar(' ');
+ if (mode.Length() != 4) {
+ FdPrintf(aStdErr, "Couldn't parse SMAPS file\n");
+ return Nothing();
+ }
+ bool readable = mode[0] == 'r';
+ bool private_ = mode[3] == 'p';
+
+ // Offset, device and inode.
+ line.SkipWhitespace();
+ bool zero_offset = !parseNumber<16>(line.SplitChar(' '));
+ line.SkipWhitespace();
+ bool no_device = line.SplitChar(' ') == Buffer("00:00");
+ line.SkipWhitespace();
+ bool zero_inode = !parseNumber(line.SplitChar(' '));
+ bool is_anon = zero_offset && no_device && zero_inode;
+
+ // Filename, or empty for anon mappings.
+ line.SkipWhitespace();
+ Buffer filename = line.SplitChar(' ');
+
+ bool is_stack;
+ bool is_special;
+ if (filename && filename[0] == '[') {
+ is_stack = filename == Buffer("[stack]");
+ is_special = filename == Buffer("[vdso]") ||
+ filename == Buffer("[vvar]") ||
+ filename == Buffer("[vsyscall]");
+ } else {
+ is_stack = false;
+ is_special = false;
+ }
+
+ size_t rss = 0;
+ while ((line = ReadLine())) {
+ Buffer field = line.SplitChar(':');
+ if (field == Buffer("VmFlags")) {
+ // This is the last field, at least in the current format. Break this
+ // loop to read the next mapping.
+ break;
+ }
+
+ if (field == Buffer("Rss")) {
+ line.SkipWhitespace();
+ Buffer value = line.SplitChar(' ');
+ rss = parseNumber(value) * 1024;
+ }
+ }
+
+ return Some(MemoryMap({range_start, range_end, readable, private_, is_anon,
+ is_stack, is_special, rss}));
+ }
+
+ static constexpr char FILENAME[] = "/proc/self/smaps";
+};
+#endif // XP_LINUX
+
+/* Class to handle dispatching the replay function calls to replace-malloc. */
+class Replay {
+ public:
+ Replay() {
+#ifdef _WIN32
+ // See comment in FdPrintf.h as to why native win32 handles are used.
+ mStdErr = reinterpret_cast<intptr_t>(GetStdHandle(STD_ERROR_HANDLE));
+#else
+ mStdErr = fileno(stderr);
+#endif
+#ifdef XP_LINUX
+ BuildInitialMapInfo();
+#endif
+ }
+
+ void enableSlopCalculation() { mCalculateSlop = true; }
+ void enableMemset() { mDoMemset = true; }
+
+ MemSlot& operator[](size_t index) const { return mSlots[index]; }
+
+ void malloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::malloc_impl(size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ MaybeCommit(aSlot);
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void posix_memalign(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t alignment = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ void* ptr;
+ if (::posix_memalign_impl(&ptr, alignment, size) == 0) {
+ aSlot.mPtr = ptr;
+ aSlot.mRequest = size;
+ MaybeCommit(aSlot);
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ } else {
+ aSlot.mPtr = nullptr;
+ }
+ }
+
+ void aligned_alloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t alignment = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::aligned_alloc_impl(alignment, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ MaybeCommit(aSlot);
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void calloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t num = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::calloc_impl(num, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = num * size;
+ MaybeCommit(aSlot);
+ if (mCalculateSlop) {
+ mTotalRequestedSize += num * size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void realloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ Buffer dummy = aArgs.SplitChar('#');
+ if (dummy) {
+ die("Malformed input");
+ }
+ size_t slot_id = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ MemSlot& old_slot = (*this)[slot_id];
+ void* old_ptr = old_slot.mPtr;
+ old_slot.mPtr = nullptr;
+ aSlot.mPtr = ::realloc_impl(old_ptr, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ MaybeCommit(aSlot);
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void free(Buffer& aArgs, Buffer& aResult) {
+ if (aResult) {
+ die("Malformed input");
+ }
+ mOps++;
+ Buffer dummy = aArgs.SplitChar('#');
+ if (dummy) {
+ die("Malformed input");
+ }
+ size_t slot_id = parseNumber(aArgs);
+ MemSlot& slot = (*this)[slot_id];
+ ::free_impl(slot.mPtr);
+ slot.mPtr = nullptr;
+ }
+
+ void memalign(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t alignment = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::memalign_impl(alignment, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ MaybeCommit(aSlot);
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void valloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::valloc_impl(size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ MaybeCommit(aSlot);
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void jemalloc_stats(Buffer& aArgs, Buffer& aResult) {
+ if (aArgs || aResult) {
+ die("Malformed input");
+ }
+ mOps++;
+ jemalloc_stats_t stats;
+ // Using a variable length array here is a GCC & Clang extension. But it
+ // allows us to place this on the stack and not alter jemalloc's profiling.
+ const size_t num_bins = ::jemalloc_stats_num_bins();
+ const size_t MAX_NUM_BINS = 100;
+ if (num_bins > MAX_NUM_BINS) {
+ die("Exceeded maximum number of jemalloc stats bins");
+ }
+ jemalloc_bin_stats_t bin_stats[MAX_NUM_BINS] = {{0}};
+ ::jemalloc_stats_internal(&stats, bin_stats);
+
+#ifdef XP_LINUX
+ size_t rss = get_rss();
+#endif
+
+ size_t num_objects = 0;
+ size_t num_sloppy_objects = 0;
+ size_t total_allocated = 0;
+ size_t total_slop = 0;
+ size_t large_slop = 0;
+ size_t large_used = 0;
+ size_t huge_slop = 0;
+ size_t huge_used = 0;
+ size_t bin_slop[MAX_NUM_BINS] = {0};
+
+ for (size_t slot_id = 0; slot_id < mNumUsedSlots; slot_id++) {
+ MemSlot& slot = mSlots[slot_id];
+ if (slot.mPtr) {
+ size_t used = ::malloc_usable_size_impl(slot.mPtr);
+ size_t slop = used - slot.mRequest;
+ total_allocated += used;
+ total_slop += slop;
+ num_objects++;
+ if (slop) {
+ num_sloppy_objects++;
+ }
+
+ if (used <=
+ (stats.subpage_max ? stats.subpage_max : stats.quantum_wide_max)) {
+ // We know that this is an inefficient linear search, but there's a
+ // small number of bins and this is simple.
+ for (unsigned i = 0; i < num_bins; i++) {
+ auto& bin = bin_stats[i];
+ if (used == bin.size) {
+ bin_slop[i] += slop;
+ break;
+ }
+ }
+ } else if (used <= stats.large_max) {
+ large_slop += slop;
+ large_used += used;
+ } else {
+ huge_slop += slop;
+ huge_used += used;
+ }
+ }
+ }
+
+ // This formula corresponds to the calculation of wasted (from committed and
+ // the other parameters) within jemalloc_stats()
+ size_t committed = stats.allocated + stats.waste + stats.page_cache +
+ stats.bookkeeping + stats.bin_unused;
+
+ FdPrintf(mStdErr, "\n");
+ FdPrintf(mStdErr, "Objects: %9zu\n", num_objects);
+ FdPrintf(mStdErr, "Slots: %9zu\n", mNumUsedSlots);
+ FdPrintf(mStdErr, "Ops: %9zu\n", mOps);
+ FdPrintf(mStdErr, "mapped: %9zu\n", stats.mapped);
+ FdPrintf(mStdErr, "committed: %9zu\n", committed);
+#ifdef XP_LINUX
+ if (rss) {
+ FdPrintf(mStdErr, "rss: %9zu\n", rss);
+ }
+#endif
+ FdPrintf(mStdErr, "allocated: %9zu\n", stats.allocated);
+ FdPrintf(mStdErr, "waste: %9zu\n", stats.waste);
+ FdPrintf(mStdErr, "dirty: %9zu\n", stats.page_cache);
+ FdPrintf(mStdErr, "bookkeep: %9zu\n", stats.bookkeeping);
+ FdPrintf(mStdErr, "bin-unused: %9zu\n", stats.bin_unused);
+ FdPrintf(mStdErr, "quantum-max: %9zu\n", stats.quantum_max);
+ FdPrintf(mStdErr, "quantum-wide-max: %9zu\n", stats.quantum_wide_max);
+ FdPrintf(mStdErr, "subpage-max: %9zu\n", stats.subpage_max);
+ FdPrintf(mStdErr, "large-max: %9zu\n", stats.large_max);
+ if (mCalculateSlop) {
+ size_t slop = mTotalAllocatedSize - mTotalRequestedSize;
+ FdPrintf(mStdErr,
+ "Total slop for all allocations: %zuKiB/%zuKiB (%zu%%)\n",
+ slop / 1024, mTotalAllocatedSize / 1024,
+ percent(slop, mTotalAllocatedSize));
+ }
+ FdPrintf(mStdErr, "Live sloppy objects: %zu/%zu (%zu%%)\n",
+ num_sloppy_objects, num_objects,
+ percent(num_sloppy_objects, num_objects));
+ FdPrintf(mStdErr, "Live sloppy bytes: %zuKiB/%zuKiB (%zu%%)\n",
+ total_slop / 1024, total_allocated / 1024,
+ percent(total_slop, total_allocated));
+
+ FdPrintf(mStdErr, "\n%8s %11s %10s %8s %9s %9s %8s\n", "bin-size",
+ "unused (c)", "total (c)", "used (c)", "non-full (r)", "total (r)",
+ "used (r)");
+ for (unsigned i = 0; i < num_bins; i++) {
+ auto& bin = bin_stats[i];
+ MOZ_ASSERT(bin.size);
+ FdPrintf(mStdErr, "%8zu %8zuKiB %7zuKiB %7zu%% %12zu %9zu %7zu%%\n",
+ bin.size, bin.bytes_unused / 1024, bin.bytes_total / 1024,
+ percent(bin.bytes_total - bin.bytes_unused, bin.bytes_total),
+ bin.num_non_full_runs, bin.num_runs,
+ percent(bin.num_runs - bin.num_non_full_runs, bin.num_runs));
+ }
+
+ FdPrintf(mStdErr, "\n%5s %8s %9s %7s\n", "bin", "slop", "used", "percent");
+ for (unsigned i = 0; i < num_bins; i++) {
+ auto& bin = bin_stats[i];
+ size_t used = bin.bytes_total - bin.bytes_unused;
+ FdPrintf(mStdErr, "%5zu %8zu %9zu %6zu%%\n", bin.size, bin_slop[i], used,
+ percent(bin_slop[i], used));
+ }
+ FdPrintf(mStdErr, "%5s %8zu %9zu %6zu%%\n", "large", large_slop, large_used,
+ percent(large_slop, large_used));
+ FdPrintf(mStdErr, "%5s %8zu %9zu %6zu%%\n", "huge", huge_slop, huge_used,
+ percent(huge_slop, huge_used));
+
+ print_distributions(stats, bin_stats);
+ }
+
+ private:
+ /*
+ * Create and print frequency distributions of memory requests.
+ */
+ void print_distributions(jemalloc_stats_t& stats,
+ jemalloc_bin_stats_t* bin_stats) {
+ const size_t num_bins = ::jemalloc_stats_num_bins();
+
+ // We compute distributions for all of the bins for small allocations
+ // (num_bins) plus two more distributions for larger allocations.
+ Distribution dists[num_bins + 2];
+
+ unsigned last_size = 0;
+ unsigned num_dists = 0;
+ for (unsigned i = 0; i < num_bins; i++) {
+ auto& bin = bin_stats[i];
+ auto& dist = dists[num_dists++];
+
+ MOZ_ASSERT(bin.size);
+ if (bin.size <= 16) {
+ // 1 byte buckets.
+ dist = Distribution(bin.size, last_size, 1);
+ } else if (bin.size <= stats.quantum_max) {
+ // 4 buckets, (4 bytes per bucket with a 16 byte quantum).
+ dist = Distribution(bin.size, last_size, stats.quantum / 4);
+ } else if (bin.size <= stats.quantum_wide_max) {
+ // 8 buckets, (32 bytes per bucket with a 256 byte quantum-wide).
+ dist = Distribution(bin.size, last_size, stats.quantum_wide / 8);
+ } else {
+ // 16 buckets.
+ dist = Distribution(bin.size, last_size, (bin.size - last_size) / 16);
+ }
+ last_size = bin.size;
+ }
+
+ // 16 buckets.
+ dists[num_dists] = Distribution(stats.page_size, last_size,
+ (stats.page_size - last_size) / 16);
+ num_dists++;
+
+ // Buckets are 1/4 of the page size (12 buckets).
+ dists[num_dists] =
+ Distribution(stats.page_size * 4, stats.page_size, stats.page_size / 4);
+ num_dists++;
+
+ MOZ_RELEASE_ASSERT(num_dists <= num_bins + 2);
+
+ for (size_t slot_id = 0; slot_id < mNumUsedSlots; slot_id++) {
+ MemSlot& slot = mSlots[slot_id];
+ if (slot.mPtr) {
+ for (size_t i = 0; i < num_dists; i++) {
+ if (slot.mRequest <= dists[i].maxSize()) {
+ dists[i].addRequest(slot.mRequest);
+ break;
+ }
+ }
+ }
+ }
+
+ for (unsigned i = 0; i < num_dists; i++) {
+ dists[i].printDist(mStdErr);
+ }
+ }
+
+#ifdef XP_LINUX
+ size_t get_rss() {
+ if (mGetRSSFailed) {
+ return 0;
+ }
+
+ // On Linux we can determine the RSS of the heap area by examining the
+ // smaps file.
+ mozilla::Maybe<SMapsReader> reader = SMapsReader::open();
+ if (!reader) {
+ mGetRSSFailed = true;
+ return 0;
+ }
+
+ size_t rss = 0;
+ while (Maybe<MemoryMap> map = reader->readMap(mStdErr)) {
+ if (map->IsCandidate() && !mSlots.ownsMapping(map->mStart) &&
+ !InitialMapsContains(map->mStart)) {
+ rss += map->mRSS;
+ }
+ }
+
+ return rss;
+ }
+
+ bool InitialMapsContains(uintptr_t aRangeStart) {
+ for (unsigned i = 0; i < mNumInitialMaps; i++) {
+ MOZ_ASSERT(i < MAX_INITIAL_MAPS);
+
+ if (mInitialMaps[i] == aRangeStart) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ public:
+ void BuildInitialMapInfo() {
+ if (mGetRSSFailed) {
+ return;
+ }
+
+ Maybe<SMapsReader> reader = SMapsReader::open();
+ if (!reader) {
+ mGetRSSFailed = true;
+ return;
+ }
+
+ while (Maybe<MemoryMap> map = reader->readMap(mStdErr)) {
+ if (map->IsCandidate()) {
+ if (mNumInitialMaps >= MAX_INITIAL_MAPS) {
+ FdPrintf(mStdErr, "Too many initial mappings, can't compute RSS\n");
+ mGetRSSFailed = false;
+ return;
+ }
+
+ mInitialMaps[mNumInitialMaps++] = map->mStart;
+ }
+ }
+ }
+#endif
+
+ private:
+ MemSlot& SlotForResult(Buffer& aResult) {
+ /* Parse result value and get the corresponding slot. */
+ Buffer dummy = aResult.SplitChar('=');
+ Buffer dummy2 = aResult.SplitChar('#');
+ if (dummy || dummy2) {
+ die("Malformed input");
+ }
+
+ size_t slot_id = parseNumber(aResult);
+ mNumUsedSlots = std::max(mNumUsedSlots, slot_id + 1);
+
+ return mSlots[slot_id];
+ }
+
+ void MaybeCommit(MemSlot& aSlot) {
+ if (mDoMemset) {
+ // Write any byte, 0x55 isn't significant.
+ memset(aSlot.mPtr, 0x55, aSlot.mRequest);
+ }
+ }
+
+ intptr_t mStdErr;
+ size_t mOps = 0;
+
+ // The number of slots that have been used. It is used to iterate over slots
+ // without accessing those we haven't initialised.
+ size_t mNumUsedSlots = 0;
+
+ MemSlotList mSlots;
+ size_t mTotalRequestedSize = 0;
+ size_t mTotalAllocatedSize = 0;
+ // Whether to calculate slop for all allocations over the runtime of a
+ // process.
+ bool mCalculateSlop = false;
+ bool mDoMemset = false;
+
+#ifdef XP_LINUX
+ // If we have a failure reading smaps info then this is used to disable that
+ // feature.
+ bool mGetRSSFailed = false;
+
+ // The initial memory mappings are recorded here at start up. We exclude
+ // memory in these mappings when computing RSS. We assume they do not grow
+ // and that no regions are allocated near them, this is true because they'll
+ // only record the .bss and .data segments from our binary and shared objects
+ // or regions that logalloc-replay has created for MappedArrays.
+ //
+ // 64 should be enough for anybody.
+ static constexpr unsigned MAX_INITIAL_MAPS = 64;
+ uintptr_t mInitialMaps[MAX_INITIAL_MAPS];
+ unsigned mNumInitialMaps = 0;
+#endif // XP_LINUX
+};
+
+static Replay replay;
+
+int main(int argc, const char* argv[]) {
+ size_t first_pid = 0;
+ FdReader reader(0);
+
+ for (int i = 1; i < argc; i++) {
+ const char* option = argv[i];
+ if (strcmp(option, "-s") == 0) {
+ // Do accounting to calculate allocation slop.
+ replay.enableSlopCalculation();
+ } else if (strcmp(option, "-c") == 0) {
+ // Touch memory as we allocate it.
+ replay.enableMemset();
+ } else {
+ fprintf(stderr, "Unknown command line option: %s\n", option);
+ return EXIT_FAILURE;
+ }
+ }
+
+ /* Read log from stdin and dispatch function calls to the Replay instance.
+ * The log format is essentially:
+ * <pid> <tid> <function>([<args>])[=<result>]
+ * <args> is a comma separated list of arguments.
+ *
+ * The logs are expected to be preprocessed so that allocations are
+ * attributed a tracking slot. The input is trusted not to have crazy
+ * values for these slot numbers.
+ *
+ * <result>, as well as some of the args to some of the function calls are
+ * such slot numbers.
+ */
+ while (true) {
+ Buffer line = reader.ReadLine();
+
+ if (!line) {
+ break;
+ }
+
+ size_t pid = parseNumber(line.SplitChar(' '));
+ if (!first_pid) {
+ first_pid = pid;
+ }
+
+ /* The log may contain data for several processes, only entries for the
+ * very first that appears are treated. */
+ if (first_pid != pid) {
+ continue;
+ }
+
+ /* The log contains thread ids for manual analysis, but we just ignore them
+ * for now. */
+ parseNumber(line.SplitChar(' '));
+
+ Buffer func = line.SplitChar('(');
+ Buffer args = line.SplitChar(')');
+
+ if (func == Buffer("jemalloc_stats")) {
+ replay.jemalloc_stats(args, line);
+ } else if (func == Buffer("free")) {
+ replay.free(args, line);
+ } else if (func == Buffer("malloc")) {
+ replay.malloc(args, line);
+ } else if (func == Buffer("posix_memalign")) {
+ replay.posix_memalign(args, line);
+ } else if (func == Buffer("aligned_alloc")) {
+ replay.aligned_alloc(args, line);
+ } else if (func == Buffer("calloc")) {
+ replay.calloc(args, line);
+ } else if (func == Buffer("realloc")) {
+ replay.realloc(args, line);
+ } else if (func == Buffer("memalign")) {
+ replay.memalign(args, line);
+ } else if (func == Buffer("valloc")) {
+ replay.valloc(args, line);
+ } else {
+ die("Malformed input");
+ }
+ }
+
+ return 0;
+}
diff --git a/memory/replace/logalloc/replay/expected_output_minimal.log b/memory/replace/logalloc/replay/expected_output_minimal.log
new file mode 100644
index 0000000000..332fe20957
--- /dev/null
+++ b/memory/replace/logalloc/replay/expected_output_minimal.log
@@ -0,0 +1,17 @@
+1 1 jemalloc_stats()
+1 1 malloc(42)=#1
+1 1 malloc(24)=#2
+1 1 free(#1)
+1 1 memalign(4096,1024)=#1
+1 1 calloc(4,42)=#3
+1 1 free(#2)
+1 1 realloc(#3,84)=#2
+1 1 memalign(256,1024)=#3
+1 1 memalign(512,1024)=#4
+1 1 memalign(4096,1024)=#5
+1 1 jemalloc_stats()
+1 1 free(#5)
+1 1 free(#4)
+1 1 free(#3)
+1 1 free(#2)
+1 1 free(#1)
diff --git a/memory/replace/logalloc/replay/logalloc_munge.py b/memory/replace/logalloc/replay/logalloc_munge.py
new file mode 100644
index 0000000000..52d0032463
--- /dev/null
+++ b/memory/replace/logalloc/replay/logalloc_munge.py
@@ -0,0 +1,147 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""
+This script takes a log from the replace-malloc logalloc library on stdin
+and munges it so that it can be used with the logalloc-replay tool.
+
+Given the following output:
+ 13663 malloc(42)=0x7f0c33502040
+ 13663 malloc(24)=0x7f0c33503040
+ 13663 free(0x7f0c33502040)
+The resulting output is:
+ 1 malloc(42)=#1
+ 1 malloc(24)=#2
+ 1 free(#1)
+
+See README for more details.
+"""
+
+import sys
+from collections import defaultdict, deque
+
+
+class IdMapping(object):
+ """Class to map values to ids.
+
+ Each value is associated to an increasing id, starting from 1.
+ When a value is removed, its id is recycled and will be reused for
+ subsequent values.
+ """
+
+ def __init__(self):
+ self.id = 1
+ self._values = {}
+ self._recycle = deque()
+
+ def __getitem__(self, value):
+ if value not in self._values:
+ if self._recycle:
+ self._values[value] = self._recycle.popleft()
+ else:
+ self._values[value] = self.id
+ self.id += 1
+ return self._values[value]
+
+ def __delitem__(self, value):
+ if value == 0:
+ return
+ self._recycle.append(self._values[value])
+ del self._values[value]
+
+ def __contains__(self, value):
+ return value == 0 or value in self._values
+
+
+class Ignored(Exception):
+ pass
+
+
+def split_log_line(line):
+ try:
+ # The format for each line is:
+ # <pid> [<tid>] <function>([<args>])[=<result>]
+ #
+ # The original format didn't include the tid, so we try to parse
+ # lines whether they have one or not.
+ pid, func_call = line.split(" ", 1)
+ call, result = func_call.split(")")
+ func, args = call.split("(")
+ args = args.split(",") if args else []
+ if result:
+ if result[0] != "=":
+ raise Ignored("Malformed input")
+ result = result[1:]
+ if " " in func:
+ tid, func = func.split(" ", 1)
+ else:
+ tid = pid
+ return pid, tid, func, args, result
+ except Exception:
+ raise Ignored("Malformed input")
+
+
+NUM_ARGUMENTS = {
+ "jemalloc_stats": 0,
+ "free": 1,
+ "malloc": 1,
+ "posix_memalign": 2,
+ "aligned_alloc": 2,
+ "calloc": 2,
+ "realloc": 2,
+ "memalign": 2,
+ "valloc": 1,
+}
+
+
+def main():
+ pids = IdMapping()
+ processes = defaultdict(lambda: {"pointers": IdMapping(), "tids": IdMapping()})
+ for line in sys.stdin:
+ line = line.strip()
+
+ try:
+ pid, tid, func, args, result = split_log_line(line)
+
+ # Replace pid with an id.
+ pid = pids[int(pid)]
+
+ process = processes[pid]
+ tid = process["tids"][int(tid)]
+
+ pointers = process["pointers"]
+
+ if func not in NUM_ARGUMENTS:
+ raise Ignored("Unknown function")
+
+ if len(args) != NUM_ARGUMENTS[func]:
+ raise Ignored("Malformed input")
+
+ if func in ("jemalloc_stats", "free") and result:
+ raise Ignored("Malformed input")
+
+ if func in ("free", "realloc"):
+ ptr = int(args[0], 16)
+ if ptr and ptr not in pointers:
+ raise Ignored("Did not see an alloc for pointer")
+ args[0] = "#%d" % pointers[ptr]
+ del pointers[ptr]
+
+ if result:
+ result = int(result, 16)
+ if not result:
+ raise Ignored("Result is NULL")
+ result = "#%d" % pointers[result]
+
+ print(
+ "%d %d %s(%s)%s"
+ % (pid, tid, func, ",".join(args), "=%s" % result if result else "")
+ )
+
+ except Exception as e:
+ print('Ignored "%s": %s' % (line, e), file=sys.stderr)
+
+
+if __name__ == "__main__":
+ main()
diff --git a/memory/replace/logalloc/replay/moz.build b/memory/replace/logalloc/replay/moz.build
new file mode 100644
index 0000000000..1d39864699
--- /dev/null
+++ b/memory/replace/logalloc/replay/moz.build
@@ -0,0 +1,92 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+Program("logalloc-replay")
+
+SOURCES += [
+ "/mfbt/Assertions.cpp",
+ "/mfbt/Poison.cpp",
+ "/mfbt/RandomNum.cpp",
+ "/mfbt/TaggedAnonymousMemory.cpp",
+ "/mfbt/Unused.cpp",
+ "/mozglue/misc/StackWalk.cpp",
+ "Replay.cpp",
+]
+
+if CONFIG["OS_TARGET"] == "WINNT":
+ SOURCES += [
+ "/mozglue/misc/ProcessType.cpp",
+ ]
+
+if CONFIG["OS_TARGET"] == "Linux":
+ LDFLAGS += ["-static-libstdc++"]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+ # Work around "warning: 'aligned_alloc' is only available on macOS 10.15 or newer"
+ # when building with MACOSX_DEPLOYMENT_TARGET < 10.15 with >= 10.15 SDK.
+ # We have our own definition of the function, so it doesn't matter what the SDK says.
+ SOURCES["Replay.cpp"].flags += ["-Wno-unguarded-availability-new"]
+
+if CONFIG["MOZ_REPLACE_MALLOC_STATIC"] and (CONFIG["MOZ_DMD"] or CONFIG["MOZ_PHC"]):
+ UNIFIED_SOURCES += [
+ "/mfbt/HashFunctions.cpp",
+ "/mfbt/JSONWriter.cpp",
+ ]
+
+if CONFIG["OS_ARCH"] == "WINNT":
+ OS_LIBS += [
+ "advapi32",
+ "dbghelp",
+ ]
+
+if CONFIG["MOZ_LINKER"] and CONFIG["MOZ_WIDGET_TOOLKIT"] == "android":
+ LOCAL_INCLUDES += [
+ "/mozglue/linker",
+ ]
+ DEFINES["__wrap_dladdr"] = "dladdr"
+
+
+if CONFIG["MOZ_BUILD_APP"] == "memory":
+ EXPORTS.mozilla += [
+ "/mozglue/misc/StackWalk.h",
+ ]
+
+if CONFIG["MOZ_BUILD_APP"] == "memory" or CONFIG["MOZ_REPLACE_MALLOC_STATIC"]:
+ UNIFIED_SOURCES += [
+ "/mfbt/double-conversion/double-conversion/bignum-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/bignum.cc",
+ "/mfbt/double-conversion/double-conversion/cached-powers.cc",
+ "/mfbt/double-conversion/double-conversion/double-to-string.cc",
+ "/mfbt/double-conversion/double-conversion/fast-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/fixed-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/string-to-double.cc",
+ "/mfbt/double-conversion/double-conversion/strtod.cc",
+ "/mozglue/misc/Printf.cpp",
+ ]
+
+if not CONFIG["MOZ_REPLACE_MALLOC_STATIC"]:
+ SOURCES += [
+ "../FdPrintf.cpp",
+ ]
+
+LOCAL_INCLUDES += [
+ "..",
+]
+
+# Link replace-malloc and the default allocator.
+USE_LIBS += [
+ "memory",
+]
+
+# The memory library defines this, so it's needed here too.
+DEFINES["IMPL_MFBT"] = True
+
+if CONFIG["MOZ_NEEDS_LIBATOMIC"]:
+ OS_LIBS += ["atomic"]
+
+DisableStlWrapping()
+
+include("/mozglue/build/replace_malloc.mozbuild")
diff --git a/memory/replace/logalloc/replay/replay.log b/memory/replace/logalloc/replay/replay.log
new file mode 100644
index 0000000000..f1e6de788b
--- /dev/null
+++ b/memory/replace/logalloc/replay/replay.log
@@ -0,0 +1,18 @@
+1 1 jemalloc_stats()
+1 1 malloc(42)=#1
+1 1 malloc(24)=#2
+2 2 malloc(42)=#1
+1 1 free(#1)
+1 1 posix_memalign(4096,1024)=#1
+1 1 calloc(4,42)=#3
+1 1 free(#2)
+1 1 realloc(#3,84)=#2
+1 1 aligned_alloc(256,1024)=#3
+1 1 memalign(512,1024)=#4
+1 1 valloc(1024)=#5
+1 1 jemalloc_stats()
+1 1 free(#5)
+1 1 free(#4)
+1 1 free(#3)
+1 1 free(#2)
+1 1 free(#1)
diff --git a/memory/replace/moz.build b/memory/replace/moz.build
new file mode 100644
index 0000000000..a76c5aac58
--- /dev/null
+++ b/memory/replace/moz.build
@@ -0,0 +1,25 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+@template
+def ReplaceMalloc(name):
+ if CONFIG["MOZ_REPLACE_MALLOC_STATIC"]:
+ DEFINES["MOZ_REPLACE_MALLOC_PREFIX"] = name.replace("-", "_")
+ FINAL_LIBRARY = "memory"
+ else:
+ SharedLibrary(name)
+
+
+DIRS += [
+ "logalloc",
+]
+
+if CONFIG["MOZ_DMD"]:
+ DIRS += ["dmd"]
+
+if CONFIG["MOZ_PHC"]:
+ DIRS += ["phc"]
diff --git a/memory/replace/phc/PHC.cpp b/memory/replace/phc/PHC.cpp
new file mode 100644
index 0000000000..7693499ae0
--- /dev/null
+++ b/memory/replace/phc/PHC.cpp
@@ -0,0 +1,1698 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// PHC is a probabilistic heap checker. A tiny fraction of randomly chosen heap
+// allocations are subject to some expensive checking via the use of OS page
+// access protection. A failed check triggers a crash, whereupon useful
+// information about the failure is put into the crash report. The cost and
+// coverage for each user is minimal, but spread over the entire user base the
+// coverage becomes significant.
+//
+// The idea comes from Chromium, where it is called GWP-ASAN. (Firefox uses PHC
+// as the name because GWP-ASAN is long, awkward, and doesn't have any
+// particular meaning.)
+//
+// In the current implementation up to 64 allocations per process can become
+// PHC allocations. These allocations must be page-sized or smaller. Each PHC
+// allocation gets its own page, and when the allocation is freed its page is
+// marked inaccessible until the page is reused for another allocation. This
+// means that a use-after-free defect (which includes double-frees) will be
+// caught if the use occurs before the page is reused for another allocation.
+// The crash report will contain stack traces for the allocation site, the free
+// site, and the use-after-free site, which is often enough to diagnose the
+// defect.
+//
+// Also, each PHC allocation is followed by a guard page. The PHC allocation is
+// positioned so that its end abuts the guard page (or as close as possible,
+// given alignment constraints). This means that a bounds violation at the end
+// of the allocation (overflow) will be caught. The crash report will contain
+// stack traces for the allocation site and the bounds violation use site,
+// which is often enough to diagnose the defect.
+//
+// (A bounds violation at the start of the allocation (underflow) will not be
+// caught, unless it is sufficiently large to hit the preceding allocation's
+// guard page, which is not that likely. It would be possible to look more
+// assiduously for underflow by randomly placing some allocations at the end of
+// the page and some at the start of the page, and GWP-ASAN does this. PHC does
+// not, however, because overflow is likely to be much more common than
+// underflow in practice.)
+//
+// We use a simple heuristic to categorize a guard page access as overflow or
+// underflow: if the address falls in the lower half of the guard page, we
+// assume it is overflow, otherwise we assume it is underflow. More
+// sophisticated heuristics are possible, but this one is very simple, and it is
+// likely that most overflows/underflows in practice are very close to the page
+// boundary.
+//
+// The design space for the randomization strategy is large. The current
+// implementation has a large random delay before it starts operating, and a
+// small random delay between each PHC allocation attempt. Each freed PHC
+// allocation is quarantined for a medium random delay before being reused, in
+// order to increase the chance of catching UAFs.
+//
+// The basic cost of PHC's operation is as follows.
+//
+// - The physical memory cost is 64 pages plus some metadata (including stack
+// traces) for each page. This amounts to 256 KiB per process on
+// architectures with 4 KiB pages and 1024 KiB on macOS/AArch64 which uses
+// 16 KiB pages.
+//
+// - The virtual memory cost is the physical memory cost plus the guard pages:
+// another 64 pages. This amounts to another 256 KiB per process on
+// architectures with 4 KiB pages and 1024 KiB on macOS/AArch64 which uses
+// 16 KiB pages. PHC is currently only enabled on 64-bit platforms so the
+// impact of the virtual memory usage is negligible.
+//
+// - Every allocation requires a size check and a decrement-and-check of an
+// atomic counter. When the counter reaches zero a PHC allocation can occur,
+// which involves marking a page as accessible and getting a stack trace for
+// the allocation site. Otherwise, mozjemalloc performs the allocation.
+//
+// - Every deallocation requires a range check on the pointer to see if it
+// involves a PHC allocation. (The choice to only do PHC allocations that are
+// a page or smaller enables this range check, because the 64 pages are
+// contiguous. Allowing larger allocations would make this more complicated,
+// and we definitely don't want something as slow as a hash table lookup on
+// every deallocation.) PHC deallocations involve marking a page as
+// inaccessible and getting a stack trace for the deallocation site.
+//
+// Note that calls to realloc(), free(), and malloc_usable_size() will
+// immediately crash if the given pointer falls within a page allocation's
+// page, but does not point to the start of the allocation itself.
+//
+// void* p = malloc(64);
+// free(p + 1); // p+1 doesn't point to the allocation start; crash
+//
+// Such crashes will not have the PHC fields in the crash report.
+//
+// PHC-specific tests can be run with the following commands:
+// - gtests: `./mach gtest '*PHC*'`
+// - xpcshell-tests: `./mach test toolkit/crashreporter/test/unit`
+// - This runs some non-PHC tests as well.
+
+#include "PHC.h"
+
+#include <stdlib.h>
+#include <time.h>
+
+#include <algorithm>
+
+#ifdef XP_WIN
+# include <process.h>
+#else
+# include <sys/mman.h>
+# include <sys/types.h>
+# include <pthread.h>
+# include <unistd.h>
+#endif
+
+#include "replace_malloc.h"
+#include "FdPrintf.h"
+#include "Mutex.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/StackWalk.h"
+#include "mozilla/ThreadLocal.h"
+#include "mozilla/XorShift128PlusRNG.h"
+
+using namespace mozilla;
+
+//---------------------------------------------------------------------------
+// Utilities
+//---------------------------------------------------------------------------
+
+#ifdef ANDROID
+// Android doesn't have pthread_atfork defined in pthread.h.
+extern "C" MOZ_EXPORT int pthread_atfork(void (*)(void), void (*)(void),
+ void (*)(void));
+#endif
+
+#ifndef DISALLOW_COPY_AND_ASSIGN
+# define DISALLOW_COPY_AND_ASSIGN(T) \
+ T(const T&); \
+ void operator=(const T&)
+#endif
+
+static malloc_table_t sMallocTable;
+
+// This class provides infallible operations for the small number of heap
+// allocations that PHC does for itself. It would be nice if we could use the
+// InfallibleAllocPolicy from mozalloc, but PHC cannot use mozalloc.
+class InfallibleAllocPolicy {
+ public:
+ static void AbortOnFailure(const void* aP) {
+ if (!aP) {
+ MOZ_CRASH("PHC failed to allocate");
+ }
+ }
+
+ template <class T>
+ static T* new_() {
+ void* p = sMallocTable.malloc(sizeof(T));
+ AbortOnFailure(p);
+ return new (p) T;
+ }
+};
+
+//---------------------------------------------------------------------------
+// Stack traces
+//---------------------------------------------------------------------------
+
+// This code is similar to the equivalent code within DMD.
+
+class StackTrace : public phc::StackTrace {
+ public:
+ StackTrace() : phc::StackTrace() {}
+
+ void Clear() { mLength = 0; }
+
+ void Fill();
+
+ private:
+ static void StackWalkCallback(uint32_t aFrameNumber, void* aPc, void* aSp,
+ void* aClosure) {
+ StackTrace* st = (StackTrace*)aClosure;
+ MOZ_ASSERT(st->mLength < kMaxFrames);
+ st->mPcs[st->mLength] = aPc;
+ st->mLength++;
+ MOZ_ASSERT(st->mLength == aFrameNumber);
+ }
+};
+
+// WARNING WARNING WARNING: this function must only be called when GMut::sMutex
+// is *not* locked, otherwise we might get deadlocks.
+//
+// How? On Windows, MozStackWalk() can lock a mutex, M, from the shared library
+// loader. Another thread might call malloc() while holding M locked (when
+// loading a shared library) and try to lock GMut::sMutex, causing a deadlock.
+// So GMut::sMutex can't be locked during the call to MozStackWalk(). (For
+// details, see https://bugzilla.mozilla.org/show_bug.cgi?id=374829#c8. On
+// Linux, something similar can happen; see bug 824340. So we just disallow it
+// on all platforms.)
+//
+// In DMD, to avoid this problem we temporarily unlock the equivalent mutex for
+// the MozStackWalk() call. But that's grotty, and things are a bit different
+// here, so we just require that stack traces be obtained before locking
+// GMut::sMutex.
+//
+// Unfortunately, there is no reliable way at compile-time or run-time to ensure
+// this pre-condition. Hence this large comment.
+//
+void StackTrace::Fill() {
+ mLength = 0;
+
+#if defined(XP_WIN) && defined(_M_IX86)
+ // This avoids MozStackWalk(), which causes unusably slow startup on Win32
+ // when it is called during static initialization (see bug 1241684).
+ //
+ // This code is cribbed from the Gecko Profiler, which also uses
+ // FramePointerStackWalk() on Win32: Registers::SyncPopulate() for the
+ // frame pointer, and GetStackTop() for the stack end.
+ CONTEXT context;
+ RtlCaptureContext(&context);
+ void** fp = reinterpret_cast<void**>(context.Ebp);
+
+ PNT_TIB pTib = reinterpret_cast<PNT_TIB>(NtCurrentTeb());
+ void* stackEnd = static_cast<void*>(pTib->StackBase);
+ FramePointerStackWalk(StackWalkCallback, kMaxFrames, this, fp, stackEnd);
+#elif defined(XP_MACOSX)
+ // This avoids MozStackWalk(), which has become unusably slow on Mac due to
+ // changes in libunwind.
+ //
+ // This code is cribbed from the Gecko Profiler, which also uses
+ // FramePointerStackWalk() on Mac: Registers::SyncPopulate() for the frame
+ // pointer, and GetStackTop() for the stack end.
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wframe-address"
+ void** fp = reinterpret_cast<void**>(__builtin_frame_address(1));
+# pragma GCC diagnostic pop
+ void* stackEnd = pthread_get_stackaddr_np(pthread_self());
+ FramePointerStackWalk(StackWalkCallback, kMaxFrames, this, fp, stackEnd);
+#else
+ MozStackWalk(StackWalkCallback, nullptr, kMaxFrames, this);
+#endif
+}
+
+//---------------------------------------------------------------------------
+// Logging
+//---------------------------------------------------------------------------
+
+// Change this to 1 to enable some PHC logging. Useful for debugging.
+#define PHC_LOGGING 0
+
+#if PHC_LOGGING
+
+static size_t GetPid() { return size_t(getpid()); }
+
+static size_t GetTid() {
+# if defined(XP_WIN)
+ return size_t(GetCurrentThreadId());
+# else
+ return size_t(pthread_self());
+# endif
+}
+
+# if defined(XP_WIN)
+# define LOG_STDERR \
+ reinterpret_cast<intptr_t>(GetStdHandle(STD_ERROR_HANDLE))
+# else
+# define LOG_STDERR 2
+# endif
+# define LOG(fmt, ...) \
+ FdPrintf(LOG_STDERR, "PHC[%zu,%zu,~%zu] " fmt, GetPid(), GetTid(), \
+ size_t(GAtomic::Now()), __VA_ARGS__)
+
+#else
+
+# define LOG(fmt, ...)
+
+#endif // PHC_LOGGING
+
+//---------------------------------------------------------------------------
+// Global state
+//---------------------------------------------------------------------------
+
+// Throughout this entire file time is measured as the number of sub-page
+// allocations performed (by PHC and mozjemalloc combined). `Time` is 64-bit
+// because we could have more than 2**32 allocations in a long-running session.
+// `Delay` is 32-bit because the delays used within PHC are always much smaller
+// than 2**32.
+using Time = uint64_t; // A moment in time.
+using Delay = uint32_t; // A time duration.
+
+// PHC only runs if the page size is 4 KiB; anything more is uncommon and would
+// use too much memory. So we hardwire this size for all platforms but macOS
+// on ARM processors. For the latter we make an exception because the minimum
+// page size supported is 16KiB so there's no way to go below that.
+static const size_t kPageSize =
+#if defined(XP_MACOSX) && defined(__aarch64__)
+ 16384
+#else
+ 4096
+#endif
+ ;
+
+// There are two kinds of page.
+// - Allocation pages, from which allocations are made.
+// - Guard pages, which are never touched by PHC.
+//
+// These page kinds are interleaved; each allocation page has a guard page on
+// either side.
+static const size_t kNumAllocPages = kPageSize == 4096 ? 4096 : 1024;
+static const size_t kNumAllPages = kNumAllocPages * 2 + 1;
+
+// The total size of the allocation pages and guard pages.
+static const size_t kAllPagesSize = kNumAllPages * kPageSize;
+
+// The junk value used to fill new allocation in debug builds. It's same value
+// as the one used by mozjemalloc. PHC applies it unconditionally in debug
+// builds. Unlike mozjemalloc, PHC doesn't consult the MALLOC_OPTIONS
+// environment variable to possibly change that behaviour.
+//
+// Also note that, unlike mozjemalloc, PHC doesn't have a poison value for freed
+// allocations because freed allocations are protected by OS page protection.
+#ifdef DEBUG
+const uint8_t kAllocJunk = 0xe4;
+#endif
+
+// The maximum time.
+static const Time kMaxTime = ~(Time(0));
+
+// The average delay before doing any page allocations at the start of a
+// process. Note that roughly 1 million allocations occur in the main process
+// while starting the browser. The delay range is 1..kAvgFirstAllocDelay*2.
+static const Delay kAvgFirstAllocDelay = 64 * 1024;
+
+// The average delay until the next attempted page allocation, once we get past
+// the first delay. The delay range is 1..kAvgAllocDelay*2.
+static const Delay kAvgAllocDelay = 16 * 1024;
+
+// The average delay before reusing a freed page. Should be significantly larger
+// than kAvgAllocDelay, otherwise there's not much point in having it. The delay
+// range is (kAvgAllocDelay / 2)..(kAvgAllocDelay / 2 * 3). This is different to
+// the other delay ranges in not having a minimum of 1, because that's such a
+// short delay that there is a high likelihood of bad stacks in any crash
+// report.
+static const Delay kAvgPageReuseDelay = 256 * 1024;
+
+// Truncate aRnd to the range (1 .. AvgDelay*2). If aRnd is random, this
+// results in an average value of aAvgDelay + 0.5, which is close enough to
+// aAvgDelay. aAvgDelay must be a power-of-two (otherwise it will crash) for
+// speed.
+template <Delay AvgDelay>
+constexpr Delay Rnd64ToDelay(uint64_t aRnd) {
+ static_assert(IsPowerOfTwo(AvgDelay), "must be a power of two");
+
+ return aRnd % (AvgDelay * 2) + 1;
+}
+
+// Maps a pointer to a PHC-specific structure:
+// - Nothing
+// - A guard page (it is unspecified which one)
+// - An allocation page (with an index < kNumAllocPages)
+//
+// The standard way of handling a PtrKind is to check IsNothing(), and if that
+// fails, to check IsGuardPage(), and if that fails, to call AllocPage().
+class PtrKind {
+ private:
+ enum class Tag : uint8_t {
+ Nothing,
+ GuardPage,
+ AllocPage,
+ };
+
+ Tag mTag;
+ uintptr_t mIndex; // Only used if mTag == Tag::AllocPage.
+
+ public:
+ // Detect what a pointer points to. This constructor must be fast because it
+ // is called for every call to free(), realloc(), malloc_usable_size(), and
+ // jemalloc_ptr_info().
+ PtrKind(const void* aPtr, const uint8_t* aPagesStart,
+ const uint8_t* aPagesLimit) {
+ if (!(aPagesStart <= aPtr && aPtr < aPagesLimit)) {
+ mTag = Tag::Nothing;
+ } else {
+ uintptr_t offset = static_cast<const uint8_t*>(aPtr) - aPagesStart;
+ uintptr_t allPageIndex = offset / kPageSize;
+ MOZ_ASSERT(allPageIndex < kNumAllPages);
+ if (allPageIndex & 1) {
+ // Odd-indexed pages are allocation pages.
+ uintptr_t allocPageIndex = allPageIndex / 2;
+ MOZ_ASSERT(allocPageIndex < kNumAllocPages);
+ mTag = Tag::AllocPage;
+ mIndex = allocPageIndex;
+ } else {
+ // Even-numbered pages are guard pages.
+ mTag = Tag::GuardPage;
+ }
+ }
+ }
+
+ bool IsNothing() const { return mTag == Tag::Nothing; }
+ bool IsGuardPage() const { return mTag == Tag::GuardPage; }
+
+ // This should only be called after IsNothing() and IsGuardPage() have been
+ // checked and failed.
+ uintptr_t AllocPageIndex() const {
+ MOZ_RELEASE_ASSERT(mTag == Tag::AllocPage);
+ return mIndex;
+ }
+};
+
+// Shared, atomic, mutable global state.
+class GAtomic {
+ public:
+ static void Init(Delay aFirstDelay) {
+ sAllocDelay = aFirstDelay;
+
+ LOG("Initial sAllocDelay <- %zu\n", size_t(aFirstDelay));
+ }
+
+ static Time Now() { return sNow; }
+
+ static void IncrementNow() { sNow++; }
+
+ // Decrements the delay and returns the decremented value.
+ static int32_t DecrementDelay() { return --sAllocDelay; }
+
+ static void SetAllocDelay(Delay aAllocDelay) { sAllocDelay = aAllocDelay; }
+
+ private:
+ // The current time. Relaxed semantics because it's primarily used for
+ // determining if an allocation can be recycled yet and therefore it doesn't
+ // need to be exact.
+ static Atomic<Time, Relaxed> sNow;
+
+ // Delay until the next attempt at a page allocation. See the comment in
+ // MaybePageAlloc() for an explanation of why it is a signed integer, and why
+ // it uses ReleaseAcquire semantics.
+ static Atomic<Delay, ReleaseAcquire> sAllocDelay;
+};
+
+Atomic<Time, Relaxed> GAtomic::sNow;
+Atomic<Delay, ReleaseAcquire> GAtomic::sAllocDelay;
+
+// Shared, immutable global state. Initialized by replace_init() and never
+// changed after that. replace_init() runs early enough that no synchronization
+// is needed.
+class GConst {
+ private:
+ // The bounds of the allocated pages.
+ uint8_t* const mPagesStart;
+ uint8_t* const mPagesLimit;
+
+ // Allocates the allocation pages and the guard pages, contiguously.
+ uint8_t* AllocAllPages() {
+ // Allocate the pages so that they are inaccessible. They are never freed,
+ // because it would happen at process termination when it would be of little
+ // use.
+ void* pages =
+#ifdef XP_WIN
+ VirtualAlloc(nullptr, kAllPagesSize, MEM_RESERVE, PAGE_NOACCESS);
+#else
+ mmap(nullptr, kAllPagesSize, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1,
+ 0);
+#endif
+ if (!pages) {
+ MOZ_CRASH();
+ }
+
+ return static_cast<uint8_t*>(pages);
+ }
+
+ public:
+ GConst()
+ : mPagesStart(AllocAllPages()), mPagesLimit(mPagesStart + kAllPagesSize) {
+ LOG("AllocAllPages at %p..%p\n", mPagesStart, mPagesLimit);
+ }
+
+ class PtrKind PtrKind(const void* aPtr) {
+ class PtrKind pk(aPtr, mPagesStart, mPagesLimit);
+ return pk;
+ }
+
+ bool IsInFirstGuardPage(const void* aPtr) {
+ return mPagesStart <= aPtr && aPtr < mPagesStart + kPageSize;
+ }
+
+ // Get the address of the allocation page referred to via an index. Used when
+ // marking the page as accessible/inaccessible.
+ uint8_t* AllocPagePtr(uintptr_t aIndex) {
+ MOZ_ASSERT(aIndex < kNumAllocPages);
+ // Multiply by two and add one to account for allocation pages *and* guard
+ // pages.
+ return mPagesStart + (2 * aIndex + 1) * kPageSize;
+ }
+};
+
+static GConst* gConst;
+
+// On MacOS, the first __thread/thread_local access calls malloc, which leads
+// to an infinite loop. So we use pthread-based TLS instead, which somehow
+// doesn't have this problem.
+#if !defined(XP_DARWIN)
+# define PHC_THREAD_LOCAL(T) MOZ_THREAD_LOCAL(T)
+#else
+# define PHC_THREAD_LOCAL(T) \
+ detail::ThreadLocal<T, detail::ThreadLocalKeyStorage>
+#endif
+
+// Thread-local state.
+class GTls {
+ GTls(const GTls&) = delete;
+
+ const GTls& operator=(const GTls&) = delete;
+
+ // When true, PHC does as little as possible.
+ //
+ // (a) It does not allocate any new page allocations.
+ //
+ // (b) It avoids doing any operations that might call malloc/free/etc., which
+ // would cause re-entry into PHC. (In practice, MozStackWalk() is the
+ // only such operation.) Note that calls to the functions in sMallocTable
+ // are ok.
+ //
+ // For example, replace_malloc() will just fall back to mozjemalloc. However,
+ // operations involving existing allocations are more complex, because those
+ // existing allocations may be page allocations. For example, if
+ // replace_free() is passed a page allocation on a PHC-disabled thread, it
+ // will free the page allocation in the usual way, but it will get a dummy
+ // freeStack in order to avoid calling MozStackWalk(), as per (b) above.
+ //
+ // This single disabling mechanism has two distinct uses.
+ //
+ // - It's used to prevent re-entry into PHC, which can cause correctness
+ // problems. For example, consider this sequence.
+ //
+ // 1. enter replace_free()
+ // 2. which calls PageFree()
+ // 3. which calls MozStackWalk()
+ // 4. which locks a mutex M, and then calls malloc
+ // 5. enter replace_malloc()
+ // 6. which calls MaybePageAlloc()
+ // 7. which calls MozStackWalk()
+ // 8. which (re)locks a mutex M --> deadlock
+ //
+ // We avoid this sequence by "disabling" the thread in PageFree() (at step
+ // 2), which causes MaybePageAlloc() to fail, avoiding the call to
+ // MozStackWalk() (at step 7).
+ //
+ // In practice, realloc or free of a PHC allocation is unlikely on a thread
+ // that is disabled because of this use: MozStackWalk() will probably only
+ // realloc/free allocations that it allocated itself, but those won't be
+ // page allocations because PHC is disabled before calling MozStackWalk().
+ //
+ // (Note that MaybePageAlloc() could safely do a page allocation so long as
+ // it avoided calling MozStackWalk() by getting a dummy allocStack. But it
+ // wouldn't be useful, and it would prevent the second use below.)
+ //
+ // - It's used to prevent PHC allocations in some tests that rely on
+ // mozjemalloc's exact allocation behaviour, which PHC does not replicate
+ // exactly. (Note that (b) isn't necessary for this use -- MozStackWalk()
+ // could be safely called -- but it is necessary for the first use above.)
+ //
+ static PHC_THREAD_LOCAL(bool) tlsIsDisabled;
+
+ public:
+ static void Init() {
+ if (!tlsIsDisabled.init()) {
+ MOZ_CRASH();
+ }
+ }
+
+ static void DisableOnCurrentThread() {
+ MOZ_ASSERT(!GTls::tlsIsDisabled.get());
+ tlsIsDisabled.set(true);
+ }
+
+ static void EnableOnCurrentThread() {
+ MOZ_ASSERT(GTls::tlsIsDisabled.get());
+ tlsIsDisabled.set(false);
+ }
+
+ static bool IsDisabledOnCurrentThread() { return tlsIsDisabled.get(); }
+};
+
+PHC_THREAD_LOCAL(bool) GTls::tlsIsDisabled;
+
+class AutoDisableOnCurrentThread {
+ AutoDisableOnCurrentThread(const AutoDisableOnCurrentThread&) = delete;
+
+ const AutoDisableOnCurrentThread& operator=(
+ const AutoDisableOnCurrentThread&) = delete;
+
+ public:
+ explicit AutoDisableOnCurrentThread() { GTls::DisableOnCurrentThread(); }
+ ~AutoDisableOnCurrentThread() { GTls::EnableOnCurrentThread(); }
+};
+
+// This type is used as a proof-of-lock token, to make it clear which functions
+// require sMutex to be locked.
+using GMutLock = const MutexAutoLock&;
+
+// Shared, mutable global state. Protected by sMutex; all accessing functions
+// take a GMutLock as proof that sMutex is held.
+class GMut {
+ enum class AllocPageState {
+ NeverAllocated = 0,
+ InUse = 1,
+ Freed = 2,
+ };
+
+ // Metadata for each allocation page.
+ class AllocPageInfo {
+ public:
+ AllocPageInfo()
+ : mState(AllocPageState::NeverAllocated),
+ mArenaId(),
+ mBaseAddr(nullptr),
+ mAllocStack(),
+ mFreeStack(),
+ mReuseTime(0) {}
+
+ // The current allocation page state.
+ AllocPageState mState;
+
+ // The arena that the allocation is nominally from. This isn't meaningful
+ // within PHC, which has no arenas. But it is necessary for reallocation of
+ // page allocations as normal allocations, such as in this code:
+ //
+ // p = moz_arena_malloc(arenaId, 4096);
+ // realloc(p, 8192);
+ //
+ // The realloc is more than one page, and thus too large for PHC to handle.
+ // Therefore, if PHC handles the first allocation, it must ask mozjemalloc
+ // to allocate the 8192 bytes in the correct arena, and to do that, it must
+ // call sMallocTable.moz_arena_malloc with the correct arenaId under the
+ // covers. Therefore it must record that arenaId.
+ //
+ // This field is also needed for jemalloc_ptr_info() to work, because it
+ // also returns the arena ID (but only in debug builds).
+ //
+ // - NeverAllocated: must be 0.
+ // - InUse | Freed: can be any valid arena ID value.
+ Maybe<arena_id_t> mArenaId;
+
+ // The starting address of the allocation. Will not be the same as the page
+ // address unless the allocation is a full page.
+ // - NeverAllocated: must be 0.
+ // - InUse | Freed: must be within the allocation page.
+ uint8_t* mBaseAddr;
+
+ // Usable size is computed as the number of bytes between the pointer and
+ // the end of the allocation page. This might be bigger than the requested
+ // size, especially if an outsized alignment is requested.
+ size_t UsableSize() const {
+ return mState == AllocPageState::NeverAllocated
+ ? 0
+ : kPageSize - (reinterpret_cast<uintptr_t>(mBaseAddr) &
+ (kPageSize - 1));
+ }
+
+ // The internal fragmentation for this allocation.
+ size_t FragmentationBytes() const {
+ MOZ_ASSERT(kPageSize >= UsableSize());
+ return mState == AllocPageState::InUse ? kPageSize - UsableSize() : 0;
+ }
+
+ // The allocation stack.
+ // - NeverAllocated: Nothing.
+ // - InUse | Freed: Some.
+ Maybe<StackTrace> mAllocStack;
+
+ // The free stack.
+ // - NeverAllocated | InUse: Nothing.
+ // - Freed: Some.
+ Maybe<StackTrace> mFreeStack;
+
+ // The time at which the page is available for reuse, as measured against
+ // GAtomic::sNow. When the page is in use this value will be kMaxTime.
+ // - NeverAllocated: must be 0.
+ // - InUse: must be kMaxTime.
+ // - Freed: must be > 0 and < kMaxTime.
+ Time mReuseTime;
+ };
+
+ public:
+ // The mutex that protects the other members.
+ static Mutex sMutex MOZ_UNANNOTATED;
+
+ GMut() : mRNG(RandomSeed<0>(), RandomSeed<1>()), mAllocPages() {
+ sMutex.Init();
+ }
+
+ uint64_t Random64(GMutLock) { return mRNG.next(); }
+
+ bool IsPageInUse(GMutLock, uintptr_t aIndex) {
+ return mAllocPages[aIndex].mState == AllocPageState::InUse;
+ }
+
+ // Is the page free? And if so, has enough time passed that we can use it?
+ bool IsPageAllocatable(GMutLock, uintptr_t aIndex, Time aNow) {
+ const AllocPageInfo& page = mAllocPages[aIndex];
+ return page.mState != AllocPageState::InUse && aNow >= page.mReuseTime;
+ }
+
+ // Get the address of the allocation page referred to via an index. Used
+ // when checking pointers against page boundaries.
+ uint8_t* AllocPageBaseAddr(GMutLock, uintptr_t aIndex) {
+ return mAllocPages[aIndex].mBaseAddr;
+ }
+
+ Maybe<arena_id_t> PageArena(GMutLock aLock, uintptr_t aIndex) {
+ const AllocPageInfo& page = mAllocPages[aIndex];
+ AssertAllocPageInUse(aLock, page);
+
+ return page.mArenaId;
+ }
+
+ size_t PageUsableSize(GMutLock aLock, uintptr_t aIndex) {
+ const AllocPageInfo& page = mAllocPages[aIndex];
+ AssertAllocPageInUse(aLock, page);
+
+ return page.UsableSize();
+ }
+
+ // The total fragmentation in PHC
+ size_t FragmentationBytes() const {
+ size_t sum = 0;
+ for (const auto& page : mAllocPages) {
+ sum += page.FragmentationBytes();
+ }
+ return sum;
+ }
+
+ void SetPageInUse(GMutLock aLock, uintptr_t aIndex,
+ const Maybe<arena_id_t>& aArenaId, uint8_t* aBaseAddr,
+ const StackTrace& aAllocStack) {
+ AllocPageInfo& page = mAllocPages[aIndex];
+ AssertAllocPageNotInUse(aLock, page);
+
+ page.mState = AllocPageState::InUse;
+ page.mArenaId = aArenaId;
+ page.mBaseAddr = aBaseAddr;
+ page.mAllocStack = Some(aAllocStack);
+ page.mFreeStack = Nothing();
+ page.mReuseTime = kMaxTime;
+ }
+
+#if PHC_LOGGING
+ Time GetFreeTime(uintptr_t aIndex) const { return mFreeTime[aIndex]; }
+#endif
+
+ void ResizePageInUse(GMutLock aLock, uintptr_t aIndex,
+ const Maybe<arena_id_t>& aArenaId, uint8_t* aNewBaseAddr,
+ const StackTrace& aAllocStack) {
+ AllocPageInfo& page = mAllocPages[aIndex];
+ AssertAllocPageInUse(aLock, page);
+
+ // page.mState is not changed.
+ if (aArenaId.isSome()) {
+ // Crash if the arenas don't match.
+ MOZ_RELEASE_ASSERT(page.mArenaId == aArenaId);
+ }
+ page.mBaseAddr = aNewBaseAddr;
+ // We could just keep the original alloc stack, but the realloc stack is
+ // more recent and therefore seems more useful.
+ page.mAllocStack = Some(aAllocStack);
+ // page.mFreeStack is not changed.
+ // page.mReuseTime is not changed.
+ };
+
+ void SetPageFreed(GMutLock aLock, uintptr_t aIndex,
+ const Maybe<arena_id_t>& aArenaId,
+ const StackTrace& aFreeStack, Delay aReuseDelay) {
+ AllocPageInfo& page = mAllocPages[aIndex];
+ AssertAllocPageInUse(aLock, page);
+
+ page.mState = AllocPageState::Freed;
+
+ // page.mArenaId is left unchanged, for jemalloc_ptr_info() calls that
+ // occur after freeing (e.g. in the PtrInfo test in TestJemalloc.cpp).
+ if (aArenaId.isSome()) {
+ // Crash if the arenas don't match.
+ MOZ_RELEASE_ASSERT(page.mArenaId == aArenaId);
+ }
+
+ // page.musableSize is left unchanged, for reporting on UAF, and for
+ // jemalloc_ptr_info() calls that occur after freeing (e.g. in the PtrInfo
+ // test in TestJemalloc.cpp).
+
+ // page.mAllocStack is left unchanged, for reporting on UAF.
+
+ page.mFreeStack = Some(aFreeStack);
+ Time now = GAtomic::Now();
+#if PHC_LOGGING
+ mFreeTime[aIndex] = now;
+#endif
+ page.mReuseTime = now + aReuseDelay;
+ }
+
+ static void CrashOnGuardPage(void* aPtr) {
+ // An operation on a guard page? This is a bounds violation. Deliberately
+ // touch the page in question, to cause a crash that triggers the usual PHC
+ // machinery.
+ LOG("CrashOnGuardPage(%p), bounds violation\n", aPtr);
+ *static_cast<uint8_t*>(aPtr) = 0;
+ MOZ_CRASH("unreachable");
+ }
+
+ void EnsureValidAndInUse(GMutLock, void* aPtr, uintptr_t aIndex)
+ MOZ_REQUIRES(sMutex) {
+ const AllocPageInfo& page = mAllocPages[aIndex];
+
+ // The pointer must point to the start of the allocation.
+ MOZ_RELEASE_ASSERT(page.mBaseAddr == aPtr);
+
+ if (page.mState == AllocPageState::Freed) {
+ LOG("EnsureValidAndInUse(%p), use-after-free\n", aPtr);
+ // An operation on a freed page? This is a particular kind of
+ // use-after-free. Deliberately touch the page in question, in order to
+ // cause a crash that triggers the usual PHC machinery. But unlock sMutex
+ // first, because that self-same PHC machinery needs to re-lock it, and
+ // the crash causes non-local control flow so sMutex won't be unlocked
+ // the normal way in the caller.
+ sMutex.Unlock();
+ *static_cast<uint8_t*>(aPtr) = 0;
+ MOZ_CRASH("unreachable");
+ }
+ }
+
+ void FillAddrInfo(GMutLock, uintptr_t aIndex, const void* aBaseAddr,
+ bool isGuardPage, phc::AddrInfo& aOut) {
+ const AllocPageInfo& page = mAllocPages[aIndex];
+ if (isGuardPage) {
+ aOut.mKind = phc::AddrInfo::Kind::GuardPage;
+ } else {
+ switch (page.mState) {
+ case AllocPageState::NeverAllocated:
+ aOut.mKind = phc::AddrInfo::Kind::NeverAllocatedPage;
+ break;
+
+ case AllocPageState::InUse:
+ aOut.mKind = phc::AddrInfo::Kind::InUsePage;
+ break;
+
+ case AllocPageState::Freed:
+ aOut.mKind = phc::AddrInfo::Kind::FreedPage;
+ break;
+
+ default:
+ MOZ_CRASH();
+ }
+ }
+ aOut.mBaseAddr = page.mBaseAddr;
+ aOut.mUsableSize = page.UsableSize();
+ aOut.mAllocStack = page.mAllocStack;
+ aOut.mFreeStack = page.mFreeStack;
+ }
+
+ void FillJemallocPtrInfo(GMutLock, const void* aPtr, uintptr_t aIndex,
+ jemalloc_ptr_info_t* aInfo) {
+ const AllocPageInfo& page = mAllocPages[aIndex];
+ switch (page.mState) {
+ case AllocPageState::NeverAllocated:
+ break;
+
+ case AllocPageState::InUse: {
+ // Only return TagLiveAlloc if the pointer is within the bounds of the
+ // allocation's usable size.
+ uint8_t* base = page.mBaseAddr;
+ uint8_t* limit = base + page.UsableSize();
+ if (base <= aPtr && aPtr < limit) {
+ *aInfo = {TagLiveAlloc, page.mBaseAddr, page.UsableSize(),
+ page.mArenaId.valueOr(0)};
+ return;
+ }
+ break;
+ }
+
+ case AllocPageState::Freed: {
+ // Only return TagFreedAlloc if the pointer is within the bounds of the
+ // former allocation's usable size.
+ uint8_t* base = page.mBaseAddr;
+ uint8_t* limit = base + page.UsableSize();
+ if (base <= aPtr && aPtr < limit) {
+ *aInfo = {TagFreedAlloc, page.mBaseAddr, page.UsableSize(),
+ page.mArenaId.valueOr(0)};
+ return;
+ }
+ break;
+ }
+
+ default:
+ MOZ_CRASH();
+ }
+
+ // Pointers into guard pages will end up here, as will pointers into
+ // allocation pages that aren't within the allocation's bounds.
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ }
+
+#ifndef XP_WIN
+ static void prefork() MOZ_NO_THREAD_SAFETY_ANALYSIS { sMutex.Lock(); }
+ static void postfork_parent() MOZ_NO_THREAD_SAFETY_ANALYSIS {
+ sMutex.Unlock();
+ }
+ static void postfork_child() { sMutex.Init(); }
+#endif
+
+#if PHC_LOGGING
+ void IncPageAllocHits(GMutLock) { mPageAllocHits++; }
+ void IncPageAllocMisses(GMutLock) { mPageAllocMisses++; }
+#else
+ void IncPageAllocHits(GMutLock) {}
+ void IncPageAllocMisses(GMutLock) {}
+#endif
+
+#if PHC_LOGGING
+ struct PageStats {
+ size_t mNumAlloced = 0;
+ size_t mNumFreed = 0;
+ };
+
+ PageStats GetPageStats(GMutLock) {
+ PageStats stats;
+
+ for (const auto& page : mAllocPages) {
+ stats.mNumAlloced += page.mState == AllocPageState::InUse ? 1 : 0;
+ stats.mNumFreed += page.mState == AllocPageState::Freed ? 1 : 0;
+ }
+
+ return stats;
+ }
+
+ size_t PageAllocHits(GMutLock) { return mPageAllocHits; }
+ size_t PageAllocAttempts(GMutLock) {
+ return mPageAllocHits + mPageAllocMisses;
+ }
+
+ // This is an integer because FdPrintf only supports integer printing.
+ size_t PageAllocHitRate(GMutLock) {
+ return mPageAllocHits * 100 / (mPageAllocHits + mPageAllocMisses);
+ }
+#endif
+
+ private:
+ template <int N>
+ uint64_t RandomSeed() {
+ // An older version of this code used RandomUint64() here, but on Mac that
+ // function uses arc4random(), which can allocate, which would cause
+ // re-entry, which would be bad. So we just use time() and a local variable
+ // address. These are mediocre sources of entropy, but good enough for PHC.
+ static_assert(N == 0 || N == 1, "must be 0 or 1");
+ uint64_t seed;
+ if (N == 0) {
+ time_t t = time(nullptr);
+ seed = t ^ (t << 32);
+ } else {
+ seed = uintptr_t(&seed) ^ (uintptr_t(&seed) << 32);
+ }
+ return seed;
+ }
+
+ void AssertAllocPageInUse(GMutLock, const AllocPageInfo& aPage) {
+ MOZ_ASSERT(aPage.mState == AllocPageState::InUse);
+ // There is nothing to assert about aPage.mArenaId.
+ MOZ_ASSERT(aPage.mBaseAddr);
+ MOZ_ASSERT(aPage.UsableSize() > 0);
+ MOZ_ASSERT(aPage.mAllocStack.isSome());
+ MOZ_ASSERT(aPage.mFreeStack.isNothing());
+ MOZ_ASSERT(aPage.mReuseTime == kMaxTime);
+ }
+
+ void AssertAllocPageNotInUse(GMutLock, const AllocPageInfo& aPage) {
+ // We can assert a lot about `NeverAllocated` pages, but not much about
+ // `Freed` pages.
+#ifdef DEBUG
+ bool isFresh = aPage.mState == AllocPageState::NeverAllocated;
+ MOZ_ASSERT(isFresh || aPage.mState == AllocPageState::Freed);
+ MOZ_ASSERT_IF(isFresh, aPage.mArenaId == Nothing());
+ MOZ_ASSERT(isFresh == (aPage.mBaseAddr == nullptr));
+ MOZ_ASSERT(isFresh == (aPage.mAllocStack.isNothing()));
+ MOZ_ASSERT(isFresh == (aPage.mFreeStack.isNothing()));
+ MOZ_ASSERT(aPage.mReuseTime != kMaxTime);
+#endif
+ }
+
+ // RNG for deciding which allocations to treat specially. It doesn't need to
+ // be high quality.
+ //
+ // This is a raw pointer for the reason explained in the comment above
+ // GMut's constructor. Don't change it to UniquePtr or anything like that.
+ non_crypto::XorShift128PlusRNG mRNG;
+
+ AllocPageInfo mAllocPages[kNumAllocPages];
+#if PHC_LOGGING
+ Time mFreeTime[kNumAllocPages];
+
+ // How many allocations that could have been page allocs actually were? As
+ // constrained kNumAllocPages. If the hit ratio isn't close to 100% it's
+ // likely that the global constants are poorly chosen.
+ size_t mPageAllocHits = 0;
+ size_t mPageAllocMisses = 0;
+#endif
+};
+
+Mutex GMut::sMutex;
+
+static GMut* gMut;
+
+//---------------------------------------------------------------------------
+// Page allocation operations
+//---------------------------------------------------------------------------
+
+// Attempt a page allocation if the time and the size are right. Allocated
+// memory is zeroed if aZero is true. On failure, the caller should attempt a
+// normal allocation via sMallocTable. Can be called in a context where
+// GMut::sMutex is locked.
+static void* MaybePageAlloc(const Maybe<arena_id_t>& aArenaId, size_t aReqSize,
+ size_t aAlignment, bool aZero) {
+ MOZ_ASSERT(IsPowerOfTwo(aAlignment));
+
+ if (aReqSize > kPageSize) {
+ return nullptr;
+ }
+
+ GAtomic::IncrementNow();
+
+ // Decrement the delay. If it's zero, we do a page allocation and reset the
+ // delay to a random number. Because the assignment to the random number isn't
+ // atomic w.r.t. the decrement, we might have a sequence like this:
+ //
+ // Thread 1 Thread 2 Thread 3
+ // -------- -------- --------
+ // (a) newDelay = --sAllocDelay (-> 0)
+ // (b) --sAllocDelay (-> -1)
+ // (c) (newDelay != 0) fails
+ // (d) --sAllocDelay (-> -2)
+ // (e) sAllocDelay = new_random_number()
+ //
+ // It's critical that sAllocDelay has ReleaseAcquire semantics, because that
+ // guarantees that exactly one thread will see sAllocDelay have the value 0.
+ // (Relaxed semantics wouldn't guarantee that.)
+ //
+ // It's also nice that sAllocDelay is signed, given that we can decrement to
+ // below zero. (Strictly speaking, an unsigned integer would also work due
+ // to wrapping, but a signed integer is conceptually cleaner.)
+ //
+ // Finally, note that the decrements that occur between (a) and (e) above are
+ // effectively ignored, because (e) clobbers them. This shouldn't be a
+ // problem; it effectively just adds a little more randomness to
+ // new_random_number(). An early version of this code tried to account for
+ // these decrements by doing `sAllocDelay += new_random_number()`. However, if
+ // new_random_value() is small, the number of decrements between (a) and (e)
+ // can easily exceed it, whereupon sAllocDelay ends up negative after
+ // `sAllocDelay += new_random_number()`, and the zero-check never succeeds
+ // again. (At least, not until sAllocDelay wraps around on overflow, which
+ // would take a very long time indeed.)
+ //
+ int32_t newDelay = GAtomic::DecrementDelay();
+ if (newDelay != 0) {
+ return nullptr;
+ }
+
+ if (GTls::IsDisabledOnCurrentThread()) {
+ return nullptr;
+ }
+
+ // Disable on this thread *before* getting the stack trace.
+ AutoDisableOnCurrentThread disable;
+
+ // Get the stack trace *before* locking the mutex. If we return nullptr then
+ // it was a waste, but it's not so frequent, and doing a stack walk while
+ // the mutex is locked is problematic (see the big comment on
+ // StackTrace::Fill() for details).
+ StackTrace allocStack;
+ allocStack.Fill();
+
+ MutexAutoLock lock(GMut::sMutex);
+
+ Time now = GAtomic::Now();
+ Delay newAllocDelay = Rnd64ToDelay<kAvgAllocDelay>(gMut->Random64(lock));
+
+ // We start at a random page alloc and wrap around, to ensure pages get even
+ // amounts of use.
+ uint8_t* ptr = nullptr;
+ uint8_t* pagePtr = nullptr;
+ for (uintptr_t n = 0, i = size_t(gMut->Random64(lock)) % kNumAllocPages;
+ n < kNumAllocPages; n++, i = (i + 1) % kNumAllocPages) {
+ if (!gMut->IsPageAllocatable(lock, i, now)) {
+ continue;
+ }
+
+#if PHC_LOGGING
+ Time lifetime = 0;
+#endif
+ pagePtr = gConst->AllocPagePtr(i);
+ MOZ_ASSERT(pagePtr);
+ bool ok =
+#ifdef XP_WIN
+ !!VirtualAlloc(pagePtr, kPageSize, MEM_COMMIT, PAGE_READWRITE);
+#else
+ mprotect(pagePtr, kPageSize, PROT_READ | PROT_WRITE) == 0;
+#endif
+
+ if (!ok) {
+ pagePtr = nullptr;
+ continue;
+ }
+
+ size_t usableSize = sMallocTable.malloc_good_size(aReqSize);
+ MOZ_ASSERT(usableSize > 0);
+
+ // Put the allocation as close to the end of the page as possible,
+ // allowing for alignment requirements.
+ ptr = pagePtr + kPageSize - usableSize;
+ if (aAlignment != 1) {
+ ptr = reinterpret_cast<uint8_t*>(
+ (reinterpret_cast<uintptr_t>(ptr) & ~(aAlignment - 1)));
+ }
+
+#if PHC_LOGGING
+ Time then = gMut->GetFreeTime(i);
+ lifetime = then != 0 ? now - then : 0;
+#endif
+
+ gMut->SetPageInUse(lock, i, aArenaId, ptr, allocStack);
+
+ if (aZero) {
+ memset(ptr, 0, usableSize);
+ } else {
+#ifdef DEBUG
+ memset(ptr, kAllocJunk, usableSize);
+#endif
+ }
+
+ gMut->IncPageAllocHits(lock);
+#if PHC_LOGGING
+ GMut::PageStats stats = gMut->GetPageStats(lock);
+#endif
+ LOG("PageAlloc(%zu, %zu) -> %p[%zu]/%p (%zu) (z%zu), sAllocDelay <- %zu, "
+ "fullness %zu/%zu/%zu, hits %zu/%zu (%zu%%), lifetime %zu\n",
+ aReqSize, aAlignment, pagePtr, i, ptr, usableSize, size_t(aZero),
+ size_t(newAllocDelay), stats.mNumAlloced, stats.mNumFreed,
+ kNumAllocPages, gMut->PageAllocHits(lock),
+ gMut->PageAllocAttempts(lock), gMut->PageAllocHitRate(lock), lifetime);
+ break;
+ }
+
+ if (!pagePtr) {
+ // No pages are available, or VirtualAlloc/mprotect failed.
+ gMut->IncPageAllocMisses(lock);
+#if PHC_LOGGING
+ GMut::PageStats stats = gMut->GetPageStats(lock);
+#endif
+ LOG("No PageAlloc(%zu, %zu), sAllocDelay <- %zu, fullness %zu/%zu/%zu, "
+ "hits %zu/%zu (%zu%%)\n",
+ aReqSize, aAlignment, size_t(newAllocDelay), stats.mNumAlloced,
+ stats.mNumFreed, kNumAllocPages, gMut->PageAllocHits(lock),
+ gMut->PageAllocAttempts(lock), gMut->PageAllocHitRate(lock));
+ }
+
+ // Set the new alloc delay.
+ GAtomic::SetAllocDelay(newAllocDelay);
+
+ return ptr;
+}
+
+static void FreePage(GMutLock aLock, uintptr_t aIndex,
+ const Maybe<arena_id_t>& aArenaId,
+ const StackTrace& aFreeStack, Delay aReuseDelay) {
+ void* pagePtr = gConst->AllocPagePtr(aIndex);
+
+#ifdef XP_WIN
+ if (!VirtualFree(pagePtr, kPageSize, MEM_DECOMMIT)) {
+ MOZ_CRASH("VirtualFree failed");
+ }
+#else
+ if (mmap(pagePtr, kPageSize, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON,
+ -1, 0) == MAP_FAILED) {
+ MOZ_CRASH("mmap failed");
+ }
+#endif
+
+ gMut->SetPageFreed(aLock, aIndex, aArenaId, aFreeStack, aReuseDelay);
+}
+
+//---------------------------------------------------------------------------
+// replace-malloc machinery
+//---------------------------------------------------------------------------
+
+// This handles malloc, moz_arena_malloc, and realloc-with-a-nullptr.
+MOZ_ALWAYS_INLINE static void* PageMalloc(const Maybe<arena_id_t>& aArenaId,
+ size_t aReqSize) {
+ void* ptr = MaybePageAlloc(aArenaId, aReqSize, /* aAlignment */ 1,
+ /* aZero */ false);
+ return ptr ? ptr
+ : (aArenaId.isSome()
+ ? sMallocTable.moz_arena_malloc(*aArenaId, aReqSize)
+ : sMallocTable.malloc(aReqSize));
+}
+
+static void* replace_malloc(size_t aReqSize) {
+ return PageMalloc(Nothing(), aReqSize);
+}
+
+static Delay ReuseDelay(GMutLock aLock) {
+ return (kAvgPageReuseDelay / 2) +
+ Rnd64ToDelay<kAvgPageReuseDelay / 2>(gMut->Random64(aLock));
+}
+
+// This handles both calloc and moz_arena_calloc.
+MOZ_ALWAYS_INLINE static void* PageCalloc(const Maybe<arena_id_t>& aArenaId,
+ size_t aNum, size_t aReqSize) {
+ CheckedInt<size_t> checkedSize = CheckedInt<size_t>(aNum) * aReqSize;
+ if (!checkedSize.isValid()) {
+ return nullptr;
+ }
+
+ void* ptr = MaybePageAlloc(aArenaId, checkedSize.value(), /* aAlignment */ 1,
+ /* aZero */ true);
+ return ptr ? ptr
+ : (aArenaId.isSome()
+ ? sMallocTable.moz_arena_calloc(*aArenaId, aNum, aReqSize)
+ : sMallocTable.calloc(aNum, aReqSize));
+}
+
+static void* replace_calloc(size_t aNum, size_t aReqSize) {
+ return PageCalloc(Nothing(), aNum, aReqSize);
+}
+
+// This function handles both realloc and moz_arena_realloc.
+//
+// As always, realloc is complicated, and doubly so when there are two
+// different kinds of allocations in play. Here are the possible transitions,
+// and what we do in practice.
+//
+// - normal-to-normal: This is straightforward and obviously necessary.
+//
+// - normal-to-page: This is disallowed because it would require getting the
+// arenaId of the normal allocation, which isn't possible in non-DEBUG builds
+// for security reasons.
+//
+// - page-to-page: This is done whenever possible, i.e. whenever the new size
+// is less than or equal to 4 KiB. This choice counterbalances the
+// disallowing of normal-to-page allocations, in order to avoid biasing
+// towards or away from page allocations. It always occurs in-place.
+//
+// - page-to-normal: this is done only when necessary, i.e. only when the new
+// size is greater than 4 KiB. This choice naturally flows from the
+// prior choice on page-to-page transitions.
+//
+// In summary: realloc doesn't change the allocation kind unless it must.
+//
+MOZ_ALWAYS_INLINE static void* PageRealloc(const Maybe<arena_id_t>& aArenaId,
+ void* aOldPtr, size_t aNewSize) {
+ if (!aOldPtr) {
+ // Null pointer. Treat like malloc(aNewSize).
+ return PageMalloc(aArenaId, aNewSize);
+ }
+
+ PtrKind pk = gConst->PtrKind(aOldPtr);
+ if (pk.IsNothing()) {
+ // A normal-to-normal transition.
+ return aArenaId.isSome()
+ ? sMallocTable.moz_arena_realloc(*aArenaId, aOldPtr, aNewSize)
+ : sMallocTable.realloc(aOldPtr, aNewSize);
+ }
+
+ if (pk.IsGuardPage()) {
+ GMut::CrashOnGuardPage(aOldPtr);
+ }
+
+ // At this point we know we have an allocation page.
+ uintptr_t index = pk.AllocPageIndex();
+
+ // A page-to-something transition.
+
+ // Note that `disable` has no effect unless it is emplaced below.
+ Maybe<AutoDisableOnCurrentThread> disable;
+ // Get the stack trace *before* locking the mutex.
+ StackTrace stack;
+ if (GTls::IsDisabledOnCurrentThread()) {
+ // PHC is disabled on this thread. Leave the stack empty.
+ } else {
+ // Disable on this thread *before* getting the stack trace.
+ disable.emplace();
+ stack.Fill();
+ }
+
+ MutexAutoLock lock(GMut::sMutex);
+
+ // Check for realloc() of a freed block.
+ gMut->EnsureValidAndInUse(lock, aOldPtr, index);
+
+ if (aNewSize <= kPageSize) {
+ // A page-to-page transition. Just keep using the page allocation. We do
+ // this even if the thread is disabled, because it doesn't create a new
+ // page allocation. Note that ResizePageInUse() checks aArenaId.
+ //
+ // Move the bytes with memmove(), because the old allocation and the new
+ // allocation overlap. Move the usable size rather than the requested size,
+ // because the user might have used malloc_usable_size() and filled up the
+ // usable size.
+ size_t oldUsableSize = gMut->PageUsableSize(lock, index);
+ size_t newUsableSize = sMallocTable.malloc_good_size(aNewSize);
+ uint8_t* pagePtr = gConst->AllocPagePtr(index);
+ uint8_t* newPtr = pagePtr + kPageSize - newUsableSize;
+ memmove(newPtr, aOldPtr, std::min(oldUsableSize, aNewSize));
+ gMut->ResizePageInUse(lock, index, aArenaId, newPtr, stack);
+ LOG("PageRealloc-Reuse(%p, %zu) -> %p\n", aOldPtr, aNewSize, newPtr);
+ return newPtr;
+ }
+
+ // A page-to-normal transition (with the new size greater than page-sized).
+ // (Note that aArenaId is checked below.)
+ void* newPtr;
+ if (aArenaId.isSome()) {
+ newPtr = sMallocTable.moz_arena_malloc(*aArenaId, aNewSize);
+ } else {
+ Maybe<arena_id_t> oldArenaId = gMut->PageArena(lock, index);
+ newPtr = (oldArenaId.isSome()
+ ? sMallocTable.moz_arena_malloc(*oldArenaId, aNewSize)
+ : sMallocTable.malloc(aNewSize));
+ }
+ if (!newPtr) {
+ return nullptr;
+ }
+
+ MOZ_ASSERT(aNewSize > kPageSize);
+
+ Delay reuseDelay = ReuseDelay(lock);
+
+ // Copy the usable size rather than the requested size, because the user
+ // might have used malloc_usable_size() and filled up the usable size. Note
+ // that FreePage() checks aArenaId (via SetPageFreed()).
+ size_t oldUsableSize = gMut->PageUsableSize(lock, index);
+ memcpy(newPtr, aOldPtr, std::min(oldUsableSize, aNewSize));
+ FreePage(lock, index, aArenaId, stack, reuseDelay);
+ LOG("PageRealloc-Free(%p[%zu], %zu) -> %p, %zu delay, reuse at ~%zu\n",
+ aOldPtr, index, aNewSize, newPtr, size_t(reuseDelay),
+ size_t(GAtomic::Now()) + reuseDelay);
+
+ return newPtr;
+}
+
+static void* replace_realloc(void* aOldPtr, size_t aNewSize) {
+ return PageRealloc(Nothing(), aOldPtr, aNewSize);
+}
+
+// This handles both free and moz_arena_free.
+MOZ_ALWAYS_INLINE static void PageFree(const Maybe<arena_id_t>& aArenaId,
+ void* aPtr) {
+ PtrKind pk = gConst->PtrKind(aPtr);
+ if (pk.IsNothing()) {
+ // Not a page allocation.
+ return aArenaId.isSome() ? sMallocTable.moz_arena_free(*aArenaId, aPtr)
+ : sMallocTable.free(aPtr);
+ }
+
+ if (pk.IsGuardPage()) {
+ GMut::CrashOnGuardPage(aPtr);
+ }
+
+ // At this point we know we have an allocation page.
+ uintptr_t index = pk.AllocPageIndex();
+
+ // Note that `disable` has no effect unless it is emplaced below.
+ Maybe<AutoDisableOnCurrentThread> disable;
+ // Get the stack trace *before* locking the mutex.
+ StackTrace freeStack;
+ if (GTls::IsDisabledOnCurrentThread()) {
+ // PHC is disabled on this thread. Leave the stack empty.
+ } else {
+ // Disable on this thread *before* getting the stack trace.
+ disable.emplace();
+ freeStack.Fill();
+ }
+
+ MutexAutoLock lock(GMut::sMutex);
+
+ // Check for a double-free.
+ gMut->EnsureValidAndInUse(lock, aPtr, index);
+
+ // Note that FreePage() checks aArenaId (via SetPageFreed()).
+ Delay reuseDelay = ReuseDelay(lock);
+ FreePage(lock, index, aArenaId, freeStack, reuseDelay);
+
+#if PHC_LOGGING
+ GMut::PageStats stats = gMut->GetPageStats(lock);
+#endif
+ LOG("PageFree(%p[%zu]), %zu delay, reuse at ~%zu, fullness %zu/%zu/%zu\n",
+ aPtr, index, size_t(reuseDelay), size_t(GAtomic::Now()) + reuseDelay,
+ stats.mNumAlloced, stats.mNumFreed, kNumAllocPages);
+}
+
+static void replace_free(void* aPtr) { return PageFree(Nothing(), aPtr); }
+
+// This handles memalign and moz_arena_memalign.
+MOZ_ALWAYS_INLINE static void* PageMemalign(const Maybe<arena_id_t>& aArenaId,
+ size_t aAlignment,
+ size_t aReqSize) {
+ MOZ_RELEASE_ASSERT(IsPowerOfTwo(aAlignment));
+
+ // PHC can't satisfy an alignment greater than a page size, so fall back to
+ // mozjemalloc in that case.
+ void* ptr = nullptr;
+ if (aAlignment <= kPageSize) {
+ ptr = MaybePageAlloc(aArenaId, aReqSize, aAlignment, /* aZero */ false);
+ }
+ return ptr ? ptr
+ : (aArenaId.isSome()
+ ? sMallocTable.moz_arena_memalign(*aArenaId, aAlignment,
+ aReqSize)
+ : sMallocTable.memalign(aAlignment, aReqSize));
+}
+
+static void* replace_memalign(size_t aAlignment, size_t aReqSize) {
+ return PageMemalign(Nothing(), aAlignment, aReqSize);
+}
+
+static size_t replace_malloc_usable_size(usable_ptr_t aPtr) {
+ PtrKind pk = gConst->PtrKind(aPtr);
+ if (pk.IsNothing()) {
+ // Not a page allocation. Measure it normally.
+ return sMallocTable.malloc_usable_size(aPtr);
+ }
+
+ if (pk.IsGuardPage()) {
+ GMut::CrashOnGuardPage(const_cast<void*>(aPtr));
+ }
+
+ // At this point we know aPtr lands within an allocation page, due to the
+ // math done in the PtrKind constructor. But if aPtr points to memory
+ // before the base address of the allocation, we return 0.
+ uintptr_t index = pk.AllocPageIndex();
+
+ MutexAutoLock lock(GMut::sMutex);
+
+ void* pageBaseAddr = gMut->AllocPageBaseAddr(lock, index);
+
+ if (MOZ_UNLIKELY(aPtr < pageBaseAddr)) {
+ return 0;
+ }
+
+ return gMut->PageUsableSize(lock, index);
+}
+
+static size_t metadata_size() {
+ return sMallocTable.malloc_usable_size(gConst) +
+ sMallocTable.malloc_usable_size(gMut);
+}
+
+void replace_jemalloc_stats(jemalloc_stats_t* aStats,
+ jemalloc_bin_stats_t* aBinStats) {
+ sMallocTable.jemalloc_stats_internal(aStats, aBinStats);
+
+ // Add all the pages to `mapped`.
+ size_t mapped = kAllPagesSize;
+ aStats->mapped += mapped;
+
+ size_t allocated = 0;
+ {
+ MutexAutoLock lock(GMut::sMutex);
+
+ // Add usable space of in-use allocations to `allocated`.
+ for (size_t i = 0; i < kNumAllocPages; i++) {
+ if (gMut->IsPageInUse(lock, i)) {
+ allocated += gMut->PageUsableSize(lock, i);
+ }
+ }
+ }
+ aStats->allocated += allocated;
+
+ // guards is the gap between `allocated` and `mapped`. In some ways this
+ // almost fits into aStats->wasted since it feels like wasted memory. However
+ // wasted should only include committed memory and these guard pages are
+ // uncommitted. Therefore we don't include it anywhere.
+ // size_t guards = mapped - allocated;
+
+ // aStats.page_cache and aStats.bin_unused are left unchanged because PHC
+ // doesn't have anything corresponding to those.
+
+ // The metadata is stored in normal heap allocations, so they're measured by
+ // mozjemalloc as `allocated`. Move them into `bookkeeping`.
+ // They're also reported under explicit/heap-overhead/phc/fragmentation in
+ // about:memory.
+ size_t bookkeeping = metadata_size();
+ aStats->allocated -= bookkeeping;
+ aStats->bookkeeping += bookkeeping;
+}
+
+void replace_jemalloc_ptr_info(const void* aPtr, jemalloc_ptr_info_t* aInfo) {
+ // We need to implement this properly, because various code locations do
+ // things like checking that allocations are in the expected arena.
+ PtrKind pk = gConst->PtrKind(aPtr);
+ if (pk.IsNothing()) {
+ // Not a page allocation.
+ return sMallocTable.jemalloc_ptr_info(aPtr, aInfo);
+ }
+
+ if (pk.IsGuardPage()) {
+ // Treat a guard page as unknown because there's no better alternative.
+ *aInfo = {TagUnknown, nullptr, 0, 0};
+ return;
+ }
+
+ // At this point we know we have an allocation page.
+ uintptr_t index = pk.AllocPageIndex();
+
+ MutexAutoLock lock(GMut::sMutex);
+
+ gMut->FillJemallocPtrInfo(lock, aPtr, index, aInfo);
+#if DEBUG
+ LOG("JemallocPtrInfo(%p[%zu]) -> {%zu, %p, %zu, %zu}\n", aPtr, index,
+ size_t(aInfo->tag), aInfo->addr, aInfo->size, aInfo->arenaId);
+#else
+ LOG("JemallocPtrInfo(%p[%zu]) -> {%zu, %p, %zu}\n", aPtr, index,
+ size_t(aInfo->tag), aInfo->addr, aInfo->size);
+#endif
+}
+
+arena_id_t replace_moz_create_arena_with_params(arena_params_t* aParams) {
+ // No need to do anything special here.
+ return sMallocTable.moz_create_arena_with_params(aParams);
+}
+
+void replace_moz_dispose_arena(arena_id_t aArenaId) {
+ // No need to do anything special here.
+ return sMallocTable.moz_dispose_arena(aArenaId);
+}
+
+void replace_moz_set_max_dirty_page_modifier(int32_t aModifier) {
+ // No need to do anything special here.
+ return sMallocTable.moz_set_max_dirty_page_modifier(aModifier);
+}
+
+void* replace_moz_arena_malloc(arena_id_t aArenaId, size_t aReqSize) {
+ return PageMalloc(Some(aArenaId), aReqSize);
+}
+
+void* replace_moz_arena_calloc(arena_id_t aArenaId, size_t aNum,
+ size_t aReqSize) {
+ return PageCalloc(Some(aArenaId), aNum, aReqSize);
+}
+
+void* replace_moz_arena_realloc(arena_id_t aArenaId, void* aOldPtr,
+ size_t aNewSize) {
+ return PageRealloc(Some(aArenaId), aOldPtr, aNewSize);
+}
+
+void replace_moz_arena_free(arena_id_t aArenaId, void* aPtr) {
+ return PageFree(Some(aArenaId), aPtr);
+}
+
+void* replace_moz_arena_memalign(arena_id_t aArenaId, size_t aAlignment,
+ size_t aReqSize) {
+ return PageMemalign(Some(aArenaId), aAlignment, aReqSize);
+}
+
+class PHCBridge : public ReplaceMallocBridge {
+ virtual bool IsPHCAllocation(const void* aPtr, phc::AddrInfo* aOut) override {
+ PtrKind pk = gConst->PtrKind(aPtr);
+ if (pk.IsNothing()) {
+ return false;
+ }
+
+ bool isGuardPage = false;
+ if (pk.IsGuardPage()) {
+ if ((uintptr_t(aPtr) % kPageSize) < (kPageSize / 2)) {
+ // The address is in the lower half of a guard page, so it's probably an
+ // overflow. But first check that it is not on the very first guard
+ // page, in which case it cannot be an overflow, and we ignore it.
+ if (gConst->IsInFirstGuardPage(aPtr)) {
+ return false;
+ }
+
+ // Get the allocation page preceding this guard page.
+ pk = gConst->PtrKind(static_cast<const uint8_t*>(aPtr) - kPageSize);
+
+ } else {
+ // The address is in the upper half of a guard page, so it's probably an
+ // underflow. Get the allocation page following this guard page.
+ pk = gConst->PtrKind(static_cast<const uint8_t*>(aPtr) + kPageSize);
+ }
+
+ // Make a note of the fact that we hit a guard page.
+ isGuardPage = true;
+ }
+
+ // At this point we know we have an allocation page.
+ uintptr_t index = pk.AllocPageIndex();
+
+ if (aOut) {
+ MutexAutoLock lock(GMut::sMutex);
+ gMut->FillAddrInfo(lock, index, aPtr, isGuardPage, *aOut);
+ LOG("IsPHCAllocation: %zu, %p, %zu, %zu, %zu\n", size_t(aOut->mKind),
+ aOut->mBaseAddr, aOut->mUsableSize,
+ aOut->mAllocStack.isSome() ? aOut->mAllocStack->mLength : 0,
+ aOut->mFreeStack.isSome() ? aOut->mFreeStack->mLength : 0);
+ }
+ return true;
+ }
+
+ virtual void DisablePHCOnCurrentThread() override {
+ GTls::DisableOnCurrentThread();
+ LOG("DisablePHCOnCurrentThread: %zu\n", 0ul);
+ }
+
+ virtual void ReenablePHCOnCurrentThread() override {
+ GTls::EnableOnCurrentThread();
+ LOG("ReenablePHCOnCurrentThread: %zu\n", 0ul);
+ }
+
+ virtual bool IsPHCEnabledOnCurrentThread() override {
+ bool enabled = !GTls::IsDisabledOnCurrentThread();
+ LOG("IsPHCEnabledOnCurrentThread: %zu\n", size_t(enabled));
+ return enabled;
+ }
+
+ virtual void PHCMemoryUsage(
+ mozilla::phc::MemoryUsage& aMemoryUsage) override {
+ aMemoryUsage.mMetadataBytes = metadata_size();
+ if (gMut) {
+ MutexAutoLock lock(GMut::sMutex);
+ aMemoryUsage.mFragmentationBytes = gMut->FragmentationBytes();
+ } else {
+ aMemoryUsage.mFragmentationBytes = 0;
+ }
+ }
+};
+
+// WARNING: this function runs *very* early -- before all static initializers
+// have run. For this reason, non-scalar globals (gConst, gMut) are allocated
+// dynamically (so we can guarantee their construction in this function) rather
+// than statically. GAtomic and GTls contain simple static data that doesn't
+// involve static initializers so they don't need to be allocated dynamically.
+void replace_init(malloc_table_t* aMallocTable, ReplaceMallocBridge** aBridge) {
+ // Don't run PHC if the page size isn't 4 KiB.
+ jemalloc_stats_t stats;
+ aMallocTable->jemalloc_stats_internal(&stats, nullptr);
+ if (stats.page_size != kPageSize) {
+ return;
+ }
+
+ sMallocTable = *aMallocTable;
+
+ // The choices of which functions to replace are complex enough that we set
+ // them individually instead of using MALLOC_FUNCS/malloc_decls.h.
+
+ aMallocTable->malloc = replace_malloc;
+ aMallocTable->calloc = replace_calloc;
+ aMallocTable->realloc = replace_realloc;
+ aMallocTable->free = replace_free;
+ aMallocTable->memalign = replace_memalign;
+
+ // posix_memalign, aligned_alloc & valloc: unset, which means they fall back
+ // to replace_memalign.
+ aMallocTable->malloc_usable_size = replace_malloc_usable_size;
+ // default malloc_good_size: the default suffices.
+
+ aMallocTable->jemalloc_stats_internal = replace_jemalloc_stats;
+ // jemalloc_purge_freed_pages: the default suffices.
+ // jemalloc_free_dirty_pages: the default suffices.
+ // jemalloc_thread_local_arena: the default suffices.
+ aMallocTable->jemalloc_ptr_info = replace_jemalloc_ptr_info;
+
+ aMallocTable->moz_create_arena_with_params =
+ replace_moz_create_arena_with_params;
+ aMallocTable->moz_dispose_arena = replace_moz_dispose_arena;
+ aMallocTable->moz_arena_malloc = replace_moz_arena_malloc;
+ aMallocTable->moz_arena_calloc = replace_moz_arena_calloc;
+ aMallocTable->moz_arena_realloc = replace_moz_arena_realloc;
+ aMallocTable->moz_arena_free = replace_moz_arena_free;
+ aMallocTable->moz_arena_memalign = replace_moz_arena_memalign;
+
+ static PHCBridge bridge;
+ *aBridge = &bridge;
+
+#ifndef XP_WIN
+ // Avoid deadlocks when forking by acquiring our state lock prior to forking
+ // and releasing it after forking. See |LogAlloc|'s |replace_init| for
+ // in-depth details.
+ //
+ // Note: This must run after attempting an allocation so as to give the
+ // system malloc a chance to insert its own atfork handler.
+ sMallocTable.malloc(-1);
+ pthread_atfork(GMut::prefork, GMut::postfork_parent, GMut::postfork_child);
+#endif
+
+ // gConst and gMut are never freed. They live for the life of the process.
+ gConst = InfallibleAllocPolicy::new_<GConst>();
+ GTls::Init();
+ gMut = InfallibleAllocPolicy::new_<GMut>();
+ {
+ MutexAutoLock lock(GMut::sMutex);
+ Delay firstAllocDelay =
+ Rnd64ToDelay<kAvgFirstAllocDelay>(gMut->Random64(lock));
+ GAtomic::Init(firstAllocDelay);
+ }
+}
diff --git a/memory/replace/phc/PHC.h b/memory/replace/phc/PHC.h
new file mode 100644
index 0000000000..139a0e81c9
--- /dev/null
+++ b/memory/replace/phc/PHC.h
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef PHC_h
+#define PHC_h
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Maybe.h"
+#include <stdint.h>
+#include <stdlib.h>
+
+namespace mozilla {
+namespace phc {
+
+// Note: a stack trace may have no frames due to a collection problem.
+//
+// Also note: a more compact stack trace representation could be achieved with
+// some effort.
+struct StackTrace {
+ public:
+ static const size_t kMaxFrames = 16;
+
+ // The number of PCs in the stack trace.
+ size_t mLength;
+
+ // The PCs in the stack trace. Only the first mLength are initialized.
+ const void* mPcs[kMaxFrames];
+
+ public:
+ StackTrace() : mLength(0) {}
+};
+
+// Info from PHC about an address in memory.
+class AddrInfo {
+ public:
+ enum class Kind {
+ // The address is not in PHC-managed memory.
+ Unknown = 0,
+
+ // The address is within a PHC page that has never been allocated. A crash
+ // involving such an address is unlikely in practice, because it would
+ // require the crash to happen quite early.
+ NeverAllocatedPage = 1,
+
+ // The address is within a PHC page that is in use.
+ InUsePage = 2,
+
+ // The address is within a PHC page that has been allocated and then freed.
+ // A crash involving such an address most likely indicates a
+ // use-after-free. (A sufficiently wild write -- e.g. a large buffer
+ // overflow -- could also trigger it, but this is less likely.)
+ FreedPage = 3,
+
+ // The address is within a PHC guard page. A crash involving such an
+ // address most likely indicates a buffer overflow. (Again, a sufficiently
+ // wild write could unluckily trigger it, but this is less likely.)
+ GuardPage = 4,
+ };
+
+ // The page kind.
+ Kind mKind;
+
+ // The starting address of the allocation.
+ // - Unknown | NeverAllocatedPage: nullptr.
+ // - InUsePage | FreedPage: the address of the allocation within the page.
+ // - GuardPage: the mBaseAddr value from the preceding allocation page.
+ const void* mBaseAddr;
+
+ // The usable size, which could be bigger than the requested size.
+ // - Unknown | NeverAllocatePage: 0.
+ // - InUsePage | FreedPage: the usable size of the allocation within the page.
+ // - GuardPage: the mUsableSize value from the preceding allocation page.
+ size_t mUsableSize;
+
+ // The allocation stack.
+ // - Unknown | NeverAllocatedPage: Nothing.
+ // - InUsePage | FreedPage: Some.
+ // - GuardPage: the mAllocStack value from the preceding allocation page.
+ mozilla::Maybe<StackTrace> mAllocStack;
+
+ // The free stack.
+ // - Unknown | NeverAllocatedPage | InUsePage: Nothing.
+ // - FreedPage: Some.
+ // - GuardPage: the mFreeStack value from the preceding allocation page.
+ mozilla::Maybe<StackTrace> mFreeStack;
+
+ // Default to no PHC info.
+ AddrInfo()
+ : mKind(Kind::Unknown),
+ mBaseAddr(nullptr),
+ mUsableSize(0),
+ mAllocStack(),
+ mFreeStack() {}
+};
+
+} // namespace phc
+} // namespace mozilla
+
+#endif /* PHC_h */
diff --git a/memory/replace/phc/moz.build b/memory/replace/phc/moz.build
new file mode 100644
index 0000000000..e2d233642c
--- /dev/null
+++ b/memory/replace/phc/moz.build
@@ -0,0 +1,50 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+ReplaceMalloc("phc")
+
+DEFINES["MOZ_NO_MOZALLOC"] = True
+DEFINES["IMPL_MFBT"] = True
+
+LOCAL_INCLUDES += [
+ "../logalloc",
+ "/memory/build",
+]
+
+EXPORTS += [
+ "PHC.h",
+]
+
+UNIFIED_SOURCES += [
+ "PHC.cpp",
+]
+
+if CONFIG["MOZ_BUILD_APP"] == "memory":
+ UNIFIED_SOURCES += [
+ "/mfbt/double-conversion/double-conversion/bignum-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/bignum.cc",
+ "/mfbt/double-conversion/double-conversion/cached-powers.cc",
+ "/mfbt/double-conversion/double-conversion/double-to-string.cc",
+ "/mfbt/double-conversion/double-conversion/fast-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/fixed-dtoa.cc",
+ "/mfbt/double-conversion/double-conversion/string-to-double.cc",
+ "/mfbt/double-conversion/double-conversion/strtod.cc",
+ "/mozglue/misc/Printf.cpp",
+ ]
+
+if not CONFIG["MOZ_REPLACE_MALLOC_STATIC"]:
+ UNIFIED_SOURCES += [
+ "../logalloc/FdPrintf.cpp",
+ "/mozglue/misc/StackWalk.cpp",
+ ]
+ if CONFIG["OS_ARCH"] == "WINNT":
+ OS_LIBS += [
+ "dbghelp",
+ ]
+
+TEST_DIRS += ["test"]
+
+DisableStlWrapping()
diff --git a/memory/replace/phc/test/gtest/TestPHC.cpp b/memory/replace/phc/test/gtest/TestPHC.cpp
new file mode 100644
index 0000000000..738a50eee2
--- /dev/null
+++ b/memory/replace/phc/test/gtest/TestPHC.cpp
@@ -0,0 +1,305 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+
+#include "mozmemory.h"
+#include "replace_malloc_bridge.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/mozalloc.h"
+#include "../../PHC.h"
+
+using namespace mozilla;
+
+bool PHCInfoEq(phc::AddrInfo& aInfo, phc::AddrInfo::Kind aKind, void* aBaseAddr,
+ size_t aUsableSize, bool aHasAllocStack, bool aHasFreeStack) {
+ return aInfo.mKind == aKind && aInfo.mBaseAddr == aBaseAddr &&
+ aInfo.mUsableSize == aUsableSize &&
+ // Proper stack traces will have at least 3 elements.
+ (aHasAllocStack ? (aInfo.mAllocStack->mLength > 2)
+ : (aInfo.mAllocStack.isNothing())) &&
+ (aHasFreeStack ? (aInfo.mFreeStack->mLength > 2)
+ : (aInfo.mFreeStack.isNothing()));
+}
+
+bool JeInfoEq(jemalloc_ptr_info_t& aInfo, PtrInfoTag aTag, void* aAddr,
+ size_t aSize, arena_id_t arenaId) {
+ return aInfo.tag == aTag && aInfo.addr == aAddr && aInfo.size == aSize
+#ifdef MOZ_DEBUG
+ && aInfo.arenaId == arenaId
+#endif
+ ;
+}
+
+uint8_t* GetPHCAllocation(size_t aSize, size_t aAlignment = 1) {
+ // A crude but effective way to get a PHC allocation.
+ for (int i = 0; i < 2000000; i++) {
+ void* p = (aAlignment == 1) ? moz_xmalloc(aSize)
+ : moz_xmemalign(aAlignment, aSize);
+ if (ReplaceMalloc::IsPHCAllocation(p, nullptr)) {
+ return (uint8_t*)p;
+ }
+ free(p);
+ }
+ return nullptr;
+}
+
+static const size_t kPageSize = 4096;
+
+TEST(PHC, TestPHCAllocations)
+{
+ // First, check that allocations of various sizes all get put at the end of
+ // their page as expected. Also, check their sizes are as expected.
+
+#define ASSERT_POS(n1, n2) \
+ p = (uint8_t*)moz_xrealloc(p, (n1)); \
+ ASSERT_EQ((reinterpret_cast<uintptr_t>(p) & (kPageSize - 1)), \
+ kPageSize - (n2)); \
+ ASSERT_EQ(moz_malloc_usable_size(p), (n2));
+
+ uint8_t* p = GetPHCAllocation(1);
+ if (!p) {
+ MOZ_CRASH("failed to get a PHC allocation");
+ }
+
+ // On Win64 the smallest possible allocation is 16 bytes. On other platforms
+ // it is 8 bytes.
+#if defined(XP_WIN) && defined(HAVE_64BIT_BUILD)
+ ASSERT_POS(8U, 16U);
+#else
+ ASSERT_POS(8U, 8U);
+#endif
+ ASSERT_POS(16U, 16U);
+ ASSERT_POS(32U, 32U);
+ ASSERT_POS(64U, 64U);
+ ASSERT_POS(128U, 128U);
+ ASSERT_POS(256U, 256U);
+ ASSERT_POS(512U, 512U);
+ ASSERT_POS(1024U, 1024U);
+ ASSERT_POS(2048U, 2048U);
+ ASSERT_POS(4096U, 4096U);
+
+ free(p);
+
+#undef ASSERT_POS
+
+ // Second, do similar checking with allocations of various alignments. Also
+ // check that their sizes (which are different to allocations with normal
+ // alignment) are the same as the sizes of equivalent non-PHC allocations.
+
+#define ASSERT_ALIGN(a1, a2) \
+ p = (uint8_t*)GetPHCAllocation(8, (a1)); \
+ ASSERT_EQ((reinterpret_cast<uintptr_t>(p) & (kPageSize - 1)), \
+ kPageSize - (a2)); \
+ ASSERT_EQ(moz_malloc_usable_size(p), (a2)); \
+ free(p); \
+ p = (uint8_t*)moz_xmemalign((a1), 8); \
+ ASSERT_EQ(moz_malloc_usable_size(p), (a2)); \
+ free(p);
+
+ // On Win64 the smallest possible allocation is 16 bytes. On other platforms
+ // it is 8 bytes.
+#if defined(XP_WIN) && defined(HAVE_64BIT_BUILD)
+ ASSERT_ALIGN(8U, 16U);
+#else
+ ASSERT_ALIGN(8U, 8U);
+#endif
+ ASSERT_ALIGN(16U, 16U);
+ ASSERT_ALIGN(32U, 32U);
+ ASSERT_ALIGN(64U, 64U);
+ ASSERT_ALIGN(128U, 128U);
+ ASSERT_ALIGN(256U, 256U);
+ ASSERT_ALIGN(512U, 512U);
+ ASSERT_ALIGN(1024U, 1024U);
+ ASSERT_ALIGN(2048U, 2048U);
+ ASSERT_ALIGN(4096U, 4096U);
+
+#undef ASSERT_ALIGN
+}
+
+TEST(PHC, TestPHCInfo)
+{
+ int stackVar;
+ phc::AddrInfo phcInfo;
+ jemalloc_ptr_info_t jeInfo;
+
+ // Test a default AddrInfo.
+ ASSERT_TRUE(PHCInfoEq(phcInfo, phc::AddrInfo::Kind::Unknown, nullptr, 0ul,
+ false, false));
+
+ // Test some non-PHC allocation addresses.
+ ASSERT_FALSE(ReplaceMalloc::IsPHCAllocation(nullptr, &phcInfo));
+ ASSERT_TRUE(PHCInfoEq(phcInfo, phc::AddrInfo::Kind::Unknown, nullptr, 0,
+ false, false));
+ ASSERT_FALSE(ReplaceMalloc::IsPHCAllocation(&stackVar, &phcInfo));
+ ASSERT_TRUE(PHCInfoEq(phcInfo, phc::AddrInfo::Kind::Unknown, nullptr, 0,
+ false, false));
+
+ uint8_t* p = GetPHCAllocation(32);
+ if (!p) {
+ MOZ_CRASH("failed to get a PHC allocation");
+ }
+
+ // Test an in-use PHC allocation: first byte within it.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::InUsePage, p, 32ul, true, false));
+ ASSERT_EQ(moz_malloc_usable_size(p), 32ul);
+ jemalloc_ptr_info(p, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagLiveAlloc, p, 32, 0));
+
+ // Test an in-use PHC allocation: last byte within it.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 31, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::InUsePage, p, 32ul, true, false));
+ ASSERT_EQ(moz_malloc_usable_size(p + 31), 32ul);
+ jemalloc_ptr_info(p + 31, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagLiveAlloc, p, 32, 0));
+
+ // Test an in-use PHC allocation: last byte before it.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p - 1, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::InUsePage, p, 32ul, true, false));
+ ASSERT_EQ(moz_malloc_usable_size(p - 1), 0ul);
+ jemalloc_ptr_info(p - 1, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test an in-use PHC allocation: first byte on its allocation page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 32 - kPageSize, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::InUsePage, p, 32ul, true, false));
+ jemalloc_ptr_info(p + 32 - kPageSize, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test an in-use PHC allocation: first byte in the following guard page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 32, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, false));
+ jemalloc_ptr_info(p + 32, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test an in-use PHC allocation: last byte in the lower half of the
+ // following guard page.
+ ASSERT_TRUE(
+ ReplaceMalloc::IsPHCAllocation(p + 32 + (kPageSize / 2 - 1), &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, false));
+ jemalloc_ptr_info(p + 32 + (kPageSize / 2 - 1), &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test an in-use PHC allocation: last byte in the preceding guard page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 31 - kPageSize, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, false));
+ jemalloc_ptr_info(p + 31 - kPageSize, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test an in-use PHC allocation: first byte in the upper half of the
+ // preceding guard page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(
+ p + 31 - kPageSize - (kPageSize / 2 - 1), &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, false));
+ jemalloc_ptr_info(p + 31 - kPageSize - (kPageSize / 2 - 1), &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ free(p);
+
+ // Test a freed PHC allocation: first byte within it.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::FreedPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagFreedAlloc, p, 32, 0));
+
+ // Test a freed PHC allocation: last byte within it.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 31, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::FreedPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p + 31, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagFreedAlloc, p, 32, 0));
+
+ // Test a freed PHC allocation: last byte before it.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p - 1, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::FreedPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p - 1, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test a freed PHC allocation: first byte on its allocation page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 32 - kPageSize, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::FreedPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p + 32 - kPageSize, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test a freed PHC allocation: first byte in the following guard page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 32, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p + 32, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test a freed PHC allocation: last byte in the lower half of the following
+ // guard page.
+ ASSERT_TRUE(
+ ReplaceMalloc::IsPHCAllocation(p + 32 + (kPageSize / 2 - 1), &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p + 32 + (kPageSize / 2 - 1), &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test a freed PHC allocation: last byte in the preceding guard page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p + 31 - kPageSize, &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p + 31 - kPageSize, &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // Test a freed PHC allocation: first byte in the upper half of the preceding
+ // guard page.
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(
+ p + 31 - kPageSize - (kPageSize / 2 - 1), &phcInfo));
+ ASSERT_TRUE(
+ PHCInfoEq(phcInfo, phc::AddrInfo::Kind::GuardPage, p, 32ul, true, true));
+ jemalloc_ptr_info(p + 31 - kPageSize - (kPageSize / 2 - 1), &jeInfo);
+ ASSERT_TRUE(JeInfoEq(jeInfo, TagUnknown, nullptr, 0, 0));
+
+ // There are no tests for `mKind == NeverAllocatedPage` because it's not
+ // possible to reliably get ahold of such a page.
+}
+
+TEST(PHC, TestPHCDisabling)
+{
+ uint8_t* p = GetPHCAllocation(32);
+ uint8_t* q = GetPHCAllocation(32);
+ if (!p || !q) {
+ MOZ_CRASH("failed to get a PHC allocation");
+ }
+
+ ASSERT_TRUE(ReplaceMalloc::IsPHCEnabledOnCurrentThread());
+ ReplaceMalloc::DisablePHCOnCurrentThread();
+ ASSERT_FALSE(ReplaceMalloc::IsPHCEnabledOnCurrentThread());
+
+ // Test realloc() on a PHC allocation while PHC is disabled on the thread.
+ uint8_t* p2 = (uint8_t*)realloc(p, 128);
+ // The small realloc is fulfilled within the same page, but it does move.
+ ASSERT_TRUE(p2 == p - 96);
+ ASSERT_TRUE(ReplaceMalloc::IsPHCAllocation(p2, nullptr));
+ uint8_t* p3 = (uint8_t*)realloc(p2, 8192);
+ // The big realloc is not in-place, and the result is not a PHC allocation.
+ ASSERT_TRUE(p3 != p2);
+ ASSERT_FALSE(ReplaceMalloc::IsPHCAllocation(p3, nullptr));
+ free(p3);
+
+ // Test free() on a PHC allocation while PHC is disabled on the thread.
+ free(q);
+
+ // These must not be PHC allocations.
+ uint8_t* r = GetPHCAllocation(32); // This will fail.
+ ASSERT_FALSE(!!r);
+
+ ReplaceMalloc::ReenablePHCOnCurrentThread();
+ ASSERT_TRUE(ReplaceMalloc::IsPHCEnabledOnCurrentThread());
+}
diff --git a/memory/replace/phc/test/gtest/moz.build b/memory/replace/phc/test/gtest/moz.build
new file mode 100644
index 0000000000..82ccaaf9c6
--- /dev/null
+++ b/memory/replace/phc/test/gtest/moz.build
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+UNIFIED_SOURCES += [
+ "TestPHC.cpp",
+]
+
+LOCAL_INCLUDES += [
+ "../../",
+]
+
+FINAL_LIBRARY = "xul-gtest"
diff --git a/memory/replace/phc/test/moz.build b/memory/replace/phc/test/moz.build
new file mode 100644
index 0000000000..8208ae849d
--- /dev/null
+++ b/memory/replace/phc/test/moz.build
@@ -0,0 +1,9 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# The gtests won't work in a SpiderMonkey-only build.
+if CONFIG["MOZ_WIDGET_TOOLKIT"]:
+ TEST_DIRS += ["gtest"]
diff --git a/memory/volatile/VolatileBuffer.h b/memory/volatile/VolatileBuffer.h
new file mode 100644
index 0000000000..badd7f3cec
--- /dev/null
+++ b/memory/volatile/VolatileBuffer.h
@@ -0,0 +1,161 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozalloc_VolatileBuffer_h
+#define mozalloc_VolatileBuffer_h
+
+#include "mozilla/mozalloc.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/RefCounted.h"
+
+/* VolatileBuffer
+ *
+ * This class represents a piece of memory that can potentially be reclaimed
+ * by the OS when not in use. As long as there are one or more
+ * VolatileBufferPtrs holding on to a VolatileBuffer, the memory will remain
+ * available. However, when there are no VolatileBufferPtrs holding a
+ * VolatileBuffer, the OS can purge the pages if it wants to. The OS can make
+ * better decisions about what pages to purge than we can.
+ *
+ * VolatileBuffers may not always be volatile - if the allocation is too small,
+ * or if the OS doesn't support the feature, or if the OS doesn't want to,
+ * the buffer will be allocated on heap.
+ *
+ * VolatileBuffer allocations are fallible. They are intended for uses where
+ * one may allocate large buffers for caching data. Init() must be called
+ * exactly once.
+ *
+ * After getting a reference to VolatileBuffer using VolatileBufferPtr,
+ * WasPurged() can be used to check if the OS purged any pages in the buffer.
+ * The OS cannot purge a buffer immediately after a VolatileBuffer is
+ * initialized. At least one VolatileBufferPtr must be created before the
+ * buffer can be purged, so the first use of VolatileBufferPtr does not need
+ * to check WasPurged().
+ *
+ * When a buffer is purged, some or all of the buffer is zeroed out. This
+ * API cannot tell which parts of the buffer were lost.
+ *
+ * VolatileBuffer and VolatileBufferPtr are threadsafe.
+ */
+
+namespace mozilla {
+
+class VolatileBuffer {
+ friend class VolatileBufferPtr_base;
+
+ public:
+ MOZ_DECLARE_REFCOUNTED_TYPENAME(VolatileBuffer)
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VolatileBuffer)
+
+ VolatileBuffer();
+
+ /* aAlignment must be a multiple of the pointer size */
+ bool Init(size_t aSize, size_t aAlignment = sizeof(void*));
+
+ size_t HeapSizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const;
+ size_t NonHeapSizeOfExcludingThis() const;
+ bool OnHeap() const;
+
+ protected:
+ bool Lock(void** aBuf);
+ void Unlock();
+
+ private:
+ ~VolatileBuffer();
+
+ /**
+ * Protects mLockCount, mFirstLock, and changes to the volatility of our
+ * buffer. Other member variables are read-only except in Init() and the
+ * destructor.
+ */
+ Mutex mMutex MOZ_UNANNOTATED;
+
+ void* mBuf;
+ size_t mSize;
+ int mLockCount;
+#if defined(ANDROID)
+ int mFd;
+#elif defined(XP_DARWIN)
+ bool mHeap;
+#elif defined(XP_WIN)
+ bool mHeap;
+ bool mFirstLock;
+#endif
+};
+
+class VolatileBufferPtr_base {
+ public:
+ explicit VolatileBufferPtr_base(VolatileBuffer* vbuf)
+ : mVBuf(vbuf), mMapping(nullptr), mPurged(false) {
+ Lock();
+ }
+
+ ~VolatileBufferPtr_base() { Unlock(); }
+
+ bool WasBufferPurged() const { return mPurged; }
+
+ protected:
+ RefPtr<VolatileBuffer> mVBuf;
+ void* mMapping;
+
+ void Set(VolatileBuffer* vbuf) {
+ Unlock();
+ mVBuf = vbuf;
+ Lock();
+ }
+
+ private:
+ bool mPurged;
+
+ void Lock() {
+ if (mVBuf) {
+ mPurged = !mVBuf->Lock(&mMapping);
+ } else {
+ mMapping = nullptr;
+ mPurged = false;
+ }
+ }
+
+ void Unlock() {
+ if (mVBuf) {
+ mVBuf->Unlock();
+ }
+ }
+};
+
+template <class T>
+class VolatileBufferPtr : public VolatileBufferPtr_base {
+ public:
+ explicit VolatileBufferPtr(VolatileBuffer* vbuf)
+ : VolatileBufferPtr_base(vbuf) {}
+ VolatileBufferPtr() : VolatileBufferPtr_base(nullptr) {}
+
+ VolatileBufferPtr(VolatileBufferPtr&& aOther)
+ : VolatileBufferPtr_base(aOther.mVBuf) {
+ aOther.Set(nullptr);
+ }
+
+ operator T*() const { return (T*)mMapping; }
+
+ VolatileBufferPtr& operator=(VolatileBuffer* aVBuf) {
+ Set(aVBuf);
+ return *this;
+ }
+
+ VolatileBufferPtr& operator=(VolatileBufferPtr&& aOther) {
+ MOZ_ASSERT(this != &aOther, "Self-moves are prohibited");
+ Set(aOther.mVBuf);
+ aOther.Set(nullptr);
+ return *this;
+ }
+
+ private:
+ VolatileBufferPtr(VolatileBufferPtr const& vbufptr) = delete;
+};
+
+} // namespace mozilla
+
+#endif /* mozalloc_VolatileBuffer_h */
diff --git a/memory/volatile/VolatileBufferAshmem.cpp b/memory/volatile/VolatileBufferAshmem.cpp
new file mode 100644
index 0000000000..99a0d1307f
--- /dev/null
+++ b/memory/volatile/VolatileBufferAshmem.cpp
@@ -0,0 +1,120 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VolatileBuffer.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/mozalloc.h"
+
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "mozilla/Ashmem.h"
+
+#ifdef MOZ_MEMORY
+extern "C" int posix_memalign(void** memptr, size_t alignment, size_t size);
+#endif
+
+#define MIN_VOLATILE_ALLOC_SIZE 8192
+
+namespace mozilla {
+
+VolatileBuffer::VolatileBuffer()
+ : mMutex("VolatileBuffer"),
+ mBuf(nullptr),
+ mSize(0),
+ mLockCount(0),
+ mFd(-1) {}
+
+bool VolatileBuffer::Init(size_t aSize, size_t aAlignment) {
+ MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
+ MOZ_ASSERT(!(aAlignment % sizeof(void*)),
+ "Alignment must be multiple of pointer size");
+
+ mSize = aSize;
+ if (aSize < MIN_VOLATILE_ALLOC_SIZE) {
+ goto heap_alloc;
+ }
+
+ mFd = mozilla::android::ashmem_create(nullptr, mSize);
+ if (mFd < 0) {
+ goto heap_alloc;
+ }
+
+ mBuf = mmap(nullptr, mSize, PROT_READ | PROT_WRITE, MAP_SHARED, mFd, 0);
+ if (mBuf != MAP_FAILED) {
+ return true;
+ }
+
+heap_alloc:
+ mBuf = nullptr;
+ if (mFd >= 0) {
+ close(mFd);
+ mFd = -1;
+ }
+
+#ifdef MOZ_MEMORY
+ posix_memalign(&mBuf, aAlignment, aSize);
+#else
+ mBuf = memalign(aAlignment, aSize);
+#endif
+ return !!mBuf;
+}
+
+VolatileBuffer::~VolatileBuffer() {
+ MOZ_ASSERT(mLockCount == 0, "Being destroyed with non-zero lock count?");
+
+ if (OnHeap()) {
+ free(mBuf);
+ } else {
+ munmap(mBuf, mSize);
+ close(mFd);
+ }
+}
+
+bool VolatileBuffer::Lock(void** aBuf) {
+ MutexAutoLock lock(mMutex);
+
+ MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer");
+
+ *aBuf = mBuf;
+ if (++mLockCount > 1 || OnHeap()) {
+ return true;
+ }
+
+ // Zero offset and zero length means we want to pin/unpin the entire thing.
+ struct ashmem_pin pin = {0, 0};
+ return ioctl(mFd, ASHMEM_PIN, &pin) == ASHMEM_NOT_PURGED;
+}
+
+void VolatileBuffer::Unlock() {
+ MutexAutoLock lock(mMutex);
+
+ MOZ_ASSERT(mLockCount > 0, "VolatileBuffer unlocked too many times!");
+ if (--mLockCount || OnHeap()) {
+ return;
+ }
+
+ struct ashmem_pin pin = {0, 0};
+ ioctl(mFd, ASHMEM_UNPIN, &pin);
+}
+
+bool VolatileBuffer::OnHeap() const { return mFd < 0; }
+
+size_t VolatileBuffer::HeapSizeOfExcludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ return OnHeap() ? aMallocSizeOf(mBuf) : 0;
+}
+
+size_t VolatileBuffer::NonHeapSizeOfExcludingThis() const {
+ if (OnHeap()) {
+ return 0;
+ }
+
+ return (mSize + (PAGE_SIZE - 1)) & PAGE_MASK;
+}
+
+} // namespace mozilla
diff --git a/memory/volatile/VolatileBufferFallback.cpp b/memory/volatile/VolatileBufferFallback.cpp
new file mode 100644
index 0000000000..d4311788ff
--- /dev/null
+++ b/memory/volatile/VolatileBufferFallback.cpp
@@ -0,0 +1,67 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VolatileBuffer.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/mozalloc.h"
+
+#ifdef MOZ_MEMORY
+int posix_memalign(void** memptr, size_t alignment, size_t size);
+#endif
+
+namespace mozilla {
+
+VolatileBuffer::VolatileBuffer()
+ : mMutex("VolatileBuffer"), mBuf(nullptr), mSize(0), mLockCount(0) {}
+
+bool VolatileBuffer::Init(size_t aSize, size_t aAlignment) {
+ MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
+ MOZ_ASSERT(!(aAlignment % sizeof(void*)),
+ "Alignment must be multiple of pointer size");
+
+ mSize = aSize;
+#if defined(MOZ_MEMORY) || defined(HAVE_POSIX_MEMALIGN)
+ if (posix_memalign(&mBuf, aAlignment, aSize) != 0) {
+ return false;
+ }
+#else
+# error "No memalign implementation found"
+#endif
+ return !!mBuf;
+}
+
+VolatileBuffer::~VolatileBuffer() {
+ MOZ_ASSERT(mLockCount == 0, "Being destroyed with non-zero lock count?");
+
+ free(mBuf);
+}
+
+bool VolatileBuffer::Lock(void** aBuf) {
+ MutexAutoLock lock(mMutex);
+
+ MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer");
+
+ *aBuf = mBuf;
+ mLockCount++;
+
+ return true;
+}
+
+void VolatileBuffer::Unlock() {
+ MutexAutoLock lock(mMutex);
+
+ mLockCount--;
+ MOZ_ASSERT(mLockCount >= 0, "VolatileBuffer unlocked too many times!");
+}
+
+bool VolatileBuffer::OnHeap() const { return true; }
+
+size_t VolatileBuffer::HeapSizeOfExcludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ return aMallocSizeOf(mBuf);
+}
+
+size_t VolatileBuffer::NonHeapSizeOfExcludingThis() const { return 0; }
+
+} // namespace mozilla
diff --git a/memory/volatile/VolatileBufferOSX.cpp b/memory/volatile/VolatileBufferOSX.cpp
new file mode 100644
index 0000000000..c6299d1db0
--- /dev/null
+++ b/memory/volatile/VolatileBufferOSX.cpp
@@ -0,0 +1,105 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VolatileBuffer.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/mozalloc.h"
+
+#include <mach/mach.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#define MIN_VOLATILE_ALLOC_SIZE 8192
+
+namespace mozilla {
+
+VolatileBuffer::VolatileBuffer()
+ : mMutex("VolatileBuffer"),
+ mBuf(nullptr),
+ mSize(0),
+ mLockCount(0),
+ mHeap(false) {}
+
+bool VolatileBuffer::Init(size_t aSize, size_t aAlignment) {
+ MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
+ MOZ_ASSERT(!(aAlignment % sizeof(void*)),
+ "Alignment must be multiple of pointer size");
+
+ mSize = aSize;
+
+ kern_return_t ret = 0;
+ if (aSize < MIN_VOLATILE_ALLOC_SIZE) {
+ goto heap_alloc;
+ }
+
+ ret = vm_allocate(mach_task_self(), (vm_address_t*)&mBuf, mSize,
+ VM_FLAGS_PURGABLE | VM_FLAGS_ANYWHERE);
+ if (ret == KERN_SUCCESS) {
+ return true;
+ }
+
+heap_alloc:
+ (void)posix_memalign(&mBuf, aAlignment, aSize);
+ mHeap = true;
+ return !!mBuf;
+}
+
+VolatileBuffer::~VolatileBuffer() {
+ MOZ_ASSERT(mLockCount == 0, "Being destroyed with non-zero lock count?");
+
+ if (OnHeap()) {
+ free(mBuf);
+ } else {
+ vm_deallocate(mach_task_self(), (vm_address_t)mBuf, mSize);
+ }
+}
+
+bool VolatileBuffer::Lock(void** aBuf) {
+ MutexAutoLock lock(mMutex);
+
+ MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer");
+
+ *aBuf = mBuf;
+ if (++mLockCount > 1 || OnHeap()) {
+ return true;
+ }
+
+ int state = VM_PURGABLE_NONVOLATILE;
+ kern_return_t ret = vm_purgable_control(mach_task_self(), (vm_address_t)mBuf,
+ VM_PURGABLE_SET_STATE, &state);
+ return ret == KERN_SUCCESS && !(state & VM_PURGABLE_EMPTY);
+}
+
+void VolatileBuffer::Unlock() {
+ MutexAutoLock lock(mMutex);
+
+ MOZ_ASSERT(mLockCount > 0, "VolatileBuffer unlocked too many times!");
+ if (--mLockCount || OnHeap()) {
+ return;
+ }
+
+ int state = VM_PURGABLE_VOLATILE | VM_VOLATILE_GROUP_DEFAULT;
+ DebugOnly<kern_return_t> ret = vm_purgable_control(
+ mach_task_self(), (vm_address_t)mBuf, VM_PURGABLE_SET_STATE, &state);
+ MOZ_ASSERT(ret == KERN_SUCCESS, "Failed to set buffer as purgable");
+}
+
+bool VolatileBuffer::OnHeap() const { return mHeap; }
+
+size_t VolatileBuffer::HeapSizeOfExcludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ return OnHeap() ? aMallocSizeOf(mBuf) : 0;
+}
+
+size_t VolatileBuffer::NonHeapSizeOfExcludingThis() const {
+ if (OnHeap()) {
+ return 0;
+ }
+
+ unsigned long pagemask = getpagesize() - 1;
+ return (mSize + pagemask) & ~pagemask;
+}
+
+} // namespace mozilla
diff --git a/memory/volatile/VolatileBufferWindows.cpp b/memory/volatile/VolatileBufferWindows.cpp
new file mode 100644
index 0000000000..6615f89299
--- /dev/null
+++ b/memory/volatile/VolatileBufferWindows.cpp
@@ -0,0 +1,136 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VolatileBuffer.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/mozalloc.h"
+#include "mozilla/WindowsVersion.h"
+
+#include <windows.h>
+
+#ifdef MOZ_MEMORY
+extern "C" int posix_memalign(void** memptr, size_t alignment, size_t size);
+#endif
+
+#ifndef MEM_RESET_UNDO
+# define MEM_RESET_UNDO 0x1000000
+#endif
+
+#define MIN_VOLATILE_ALLOC_SIZE 8192
+
+namespace mozilla {
+
+VolatileBuffer::VolatileBuffer()
+ : mMutex("VolatileBuffer"),
+ mBuf(nullptr),
+ mSize(0),
+ mLockCount(0),
+ mHeap(false),
+ mFirstLock(true) {}
+
+bool VolatileBuffer::Init(size_t aSize, size_t aAlignment) {
+ MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
+ MOZ_ASSERT(!(aAlignment % sizeof(void*)),
+ "Alignment must be multiple of pointer size");
+
+ mSize = aSize;
+ if (aSize < MIN_VOLATILE_ALLOC_SIZE) {
+ goto heap_alloc;
+ }
+
+ static bool sUndoSupported = IsWin8OrLater();
+ if (!sUndoSupported) {
+ goto heap_alloc;
+ }
+
+ mBuf = VirtualAllocEx(GetCurrentProcess(), nullptr, mSize,
+ MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+ if (mBuf) {
+ return true;
+ }
+
+heap_alloc:
+#ifdef MOZ_MEMORY
+ posix_memalign(&mBuf, aAlignment, aSize);
+#else
+ mBuf = _aligned_malloc(aSize, aAlignment);
+#endif
+ mHeap = true;
+ return !!mBuf;
+}
+
+VolatileBuffer::~VolatileBuffer() {
+ MOZ_ASSERT(mLockCount == 0, "Being destroyed with non-zero lock count?");
+
+ if (OnHeap()) {
+#ifdef MOZ_MEMORY
+ free(mBuf);
+#else
+ _aligned_free(mBuf);
+#endif
+ } else {
+ VirtualFreeEx(GetCurrentProcess(), mBuf, 0, MEM_RELEASE);
+ }
+}
+
+bool VolatileBuffer::Lock(void** aBuf) {
+ MutexAutoLock lock(mMutex);
+
+ MOZ_ASSERT(mBuf, "Attempting to lock an uninitialized VolatileBuffer");
+
+ *aBuf = mBuf;
+ if (++mLockCount > 1 || OnHeap()) {
+ return true;
+ }
+
+ // MEM_RESET_UNDO's behavior is undefined when called on memory that
+ // hasn't been MEM_RESET.
+ if (mFirstLock) {
+ mFirstLock = false;
+ return true;
+ }
+
+ void* addr = VirtualAllocEx(GetCurrentProcess(), mBuf, mSize, MEM_RESET_UNDO,
+ PAGE_READWRITE);
+ return !!addr;
+}
+
+void VolatileBuffer::Unlock() {
+ MutexAutoLock lock(mMutex);
+
+ MOZ_ASSERT(mLockCount > 0, "VolatileBuffer unlocked too many times!");
+ if (--mLockCount || OnHeap()) {
+ return;
+ }
+
+ DebugOnly<void*> addr = VirtualAllocEx(GetCurrentProcess(), mBuf, mSize,
+ MEM_RESET, PAGE_READWRITE);
+ MOZ_ASSERT(addr, "Failed to MEM_RESET");
+}
+
+bool VolatileBuffer::OnHeap() const { return mHeap; }
+
+size_t VolatileBuffer::HeapSizeOfExcludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ if (OnHeap()) {
+#ifdef MOZ_MEMORY
+ return aMallocSizeOf(mBuf);
+#else
+ return mSize;
+#endif
+ }
+
+ return 0;
+}
+
+size_t VolatileBuffer::NonHeapSizeOfExcludingThis() const {
+ if (OnHeap()) {
+ return 0;
+ }
+
+ return (mSize + 4095) & ~4095;
+}
+
+} // namespace mozilla
diff --git a/memory/volatile/moz.build b/memory/volatile/moz.build
new file mode 100644
index 0000000000..9cfe43e5d0
--- /dev/null
+++ b/memory/volatile/moz.build
@@ -0,0 +1,31 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+NoVisibilityFlags()
+
+EXPORTS.mozilla += [
+ "VolatileBuffer.h",
+]
+
+if CONFIG["OS_TARGET"] == "Android":
+ UNIFIED_SOURCES += [
+ "VolatileBufferAshmem.cpp",
+ ]
+elif CONFIG["OS_TARGET"] == "Darwin":
+ UNIFIED_SOURCES += [
+ "VolatileBufferOSX.cpp",
+ ]
+elif CONFIG["OS_TARGET"] == "WINNT":
+ UNIFIED_SOURCES += [
+ "VolatileBufferWindows.cpp",
+ ]
+else:
+ UNIFIED_SOURCES += [
+ "VolatileBufferFallback.cpp",
+ ]
+
+FINAL_LIBRARY = "xul"
+
+TEST_DIRS += ["tests"]
diff --git a/memory/volatile/tests/TestVolatileBuffer.cpp b/memory/volatile/tests/TestVolatileBuffer.cpp
new file mode 100644
index 0000000000..e9e9699ec6
--- /dev/null
+++ b/memory/volatile/tests/TestVolatileBuffer.cpp
@@ -0,0 +1,100 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "mozilla/VolatileBuffer.h"
+#include <string.h>
+
+#if defined(ANDROID)
+# include <fcntl.h>
+# include <linux/ashmem.h>
+# include <sys/ioctl.h>
+# include <sys/stat.h>
+# include <sys/types.h>
+#elif defined(XP_DARWIN)
+# include <mach/mach.h>
+#endif
+
+using namespace mozilla;
+
+TEST(VolatileBufferTest, HeapVolatileBuffersWork)
+{
+ RefPtr<VolatileBuffer> heapbuf = new VolatileBuffer();
+
+ ASSERT_TRUE(heapbuf)
+ << "Failed to create VolatileBuffer";
+ ASSERT_TRUE(heapbuf->Init(512))
+ << "Failed to initialize VolatileBuffer";
+
+ VolatileBufferPtr<char> ptr(heapbuf);
+
+ EXPECT_FALSE(ptr.WasBufferPurged())
+ << "Buffer should not be purged immediately after initialization";
+ EXPECT_TRUE(ptr) << "Couldn't get pointer from VolatileBufferPtr";
+}
+
+TEST(VolatileBufferTest, RealVolatileBuffersWork)
+{
+ RefPtr<VolatileBuffer> buf = new VolatileBuffer();
+
+ ASSERT_TRUE(buf)
+ << "Failed to create VolatileBuffer";
+ ASSERT_TRUE(buf->Init(16384))
+ << "Failed to initialize VolatileBuffer";
+
+ const char teststr[] = "foobar";
+
+ {
+ VolatileBufferPtr<char> ptr(buf);
+
+ EXPECT_FALSE(ptr.WasBufferPurged())
+ << "Buffer should not be purged immediately after initialization";
+ EXPECT_TRUE(ptr) << "Couldn't get pointer from VolatileBufferPtr";
+
+ {
+ VolatileBufferPtr<char> ptr2(buf);
+
+ EXPECT_FALSE(ptr.WasBufferPurged())
+ << "Failed to lock buffer again while currently locked";
+ ASSERT_TRUE(ptr2)
+ << "Didn't get a pointer on the second lock";
+
+ strcpy(ptr2, teststr);
+ }
+ }
+
+ {
+ VolatileBufferPtr<char> ptr(buf);
+
+ EXPECT_FALSE(ptr.WasBufferPurged())
+ << "Buffer was immediately purged after unlock";
+ EXPECT_STREQ(ptr, teststr) << "Buffer failed to retain data after unlock";
+ }
+
+ // Test purging if we know how to
+#if defined(XP_DARWIN)
+ int state;
+ vm_purgable_control(mach_task_self(), (vm_address_t)NULL,
+ VM_PURGABLE_PURGE_ALL, &state);
+#else
+ return;
+#endif
+
+ EXPECT_GT(buf->NonHeapSizeOfExcludingThis(), 0ul)
+ << "Buffer should not be allocated on heap";
+
+ {
+ VolatileBufferPtr<char> ptr(buf);
+
+ EXPECT_TRUE(ptr.WasBufferPurged())
+ << "Buffer should not be unpurged after forced purge";
+ EXPECT_STRNE(ptr, teststr) << "Purge did not actually purge data";
+ }
+
+ {
+ VolatileBufferPtr<char> ptr(buf);
+
+ EXPECT_FALSE(ptr.WasBufferPurged()) << "Buffer still purged after lock";
+ }
+}
diff --git a/memory/volatile/tests/moz.build b/memory/volatile/tests/moz.build
new file mode 100644
index 0000000000..31201db9d4
--- /dev/null
+++ b/memory/volatile/tests/moz.build
@@ -0,0 +1,11 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+UNIFIED_SOURCES = [
+ "TestVolatileBuffer.cpp",
+]
+
+FINAL_LIBRARY = "xul-gtest"