Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

20 files changed, 1220 insertions, 0 deletions

diff --git a/mozglue/build/AsanOptions.cpp b/mozglue/build/AsanOptions.cpp
new file mode 100644
index 0000000000..a2539e450d
--- /dev/null
+++ b/mozglue/build/AsanOptions.cpp
@@ -0,0 +1,194 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/Attributes.h"
+
+#ifndef _MSC_VER  // Not supported by clang-cl yet
+
+// When running with AddressSanitizer, we need to explicitly set some
+// options specific to our codebase to prevent errors during runtime.
+// To override these, set the ASAN_OPTIONS environment variable.
+//
+// Currently, these are:
+//
+//   allow_user_segv_handler=1 - Tell ASan to allow our code to use its
+//   own SIGSEGV handlers. This is required by ASM.js internally.
+//
+//   alloc_dealloc_mismatch=0 - Disable alloc-dealloc mismatch checking
+//   in ASan. This is required because we define our own new/delete
+//   operators that are backed by malloc/free. If one of them gets inlined
+//   while the other doesn't, ASan will report false positives.
+//
+//   detect_leaks=0 - Disable LeakSanitizer. This is required because
+//   otherwise leak checking will be enabled for various building and
+//   testing executables where we don't care much about leaks.
+//
+//   allocator_may_return_null=1 - Tell ASan to return NULL when an allocation
+//   fails instead of aborting the program. This allows us to handle failing
+//   allocations the same way we would handle them with a regular allocator and
+//   also uncovers potential bugs that might occur in these situations.
+//
+//   max_malloc_fill_size - Tell ASan to initialize memory to a certain value
+//   when it is allocated. This option specifies the maximum allocation size
+//   for which ASan should still initialize the memory. The value we specify
+//   here is exactly 256MiB.
+//
+//   max_free_fill_size - Similar to max_malloc_fill_size, tell ASan to
+//   overwrite memory with a certain value when it is freed. Again, the value
+//   here specifies the maximum allocation size, larger allocations will
+//   skipped.
+//
+//   malloc_fill_byte / free_fill_byte - These values specify the byte values
+//   used to initialize/overwrite memory in conjunction with the previous
+//   options max_malloc_fill_size and max_free_fill_size. The values used here
+//   are 0xe4 and 0xe5 to match the kAllocPoison and kAllocJunk constants used
+//   by mozjemalloc.
+//
+//   malloc_context_size - This value specifies how many stack frames are
+//   stored for each malloc and free call. Since Firefox can have lots of deep
+//   stacks with allocations, we limit the default size here further to save
+//   some memory.
+//
+//   fast_unwind_on_check - Use the fast (frame-pointer-based) stack unwinder
+//   for internal CHECK failures. The slow unwinder doesn't work on Android.
+//
+//   fast_unwind_on_fatal - Use the fast (frame-pointer-based) stack unwinder
+//   to print fatal error reports. The slow unwinder doesn't work on Android.
+//
+//   detect_stack_use_after_return=0 - Work around bug 1768099.
+//
+//   intercept_tls_get_addr=0 - Work around
+//   https://github.com/google/sanitizers/issues/1322 (bug 1635327).
+//
+// !! Note: __asan_default_options is not used on Android! (bug 1576213)
+// These should be updated in:
+//   mobile/android/geckoview/src/asan/resources/lib/*/wrap.sh
+//
+extern "C" MOZ_ASAN_BLACKLIST const char* __asan_default_options() {
+  return "allow_user_segv_handler=1:alloc_dealloc_mismatch=0:detect_leaks=0"
+#  ifdef MOZ_ASAN_REPORTER
+         ":malloc_context_size=20"
+#  endif
+#  ifdef __ANDROID__
+         ":fast_unwind_on_check=1:fast_unwind_on_fatal=1"
+#  endif
+         ":max_free_fill_size=268435456:max_malloc_fill_size=268435456"
+         ":malloc_fill_byte=228:free_fill_byte=229"
+         ":handle_sigill=1"
+         ":allocator_may_return_null=1"
+         ":detect_stack_use_after_return=0"
+         ":intercept_tls_get_addr=0";
+}
+
+// !!! Please do not add suppressions for new leaks in Gecko code, unless they
+// are intentional !!!
+extern "C" const char* __lsan_default_suppressions() {
+  return "# Add your suppressions below\n"
+
+         // LSan runs with a shallow stack depth and no debug symbols, so some
+         // small intentional leaks in system libraries show up with this.  You
+         // do not want this enabled when running locally with a deep stack, as
+         // it can catch too much.
+         "leak:libc.so\n"
+
+         // nsComponentManagerImpl intentionally leaks factory entries, and
+         // probably some other stuff.
+         "leak:nsComponentManagerImpl\n"
+
+         // Bug 981220 - Pixman fails to free TLS memory.
+         "leak:pixman_implementation_lookup_composite\n"
+
+         // Bug 987918 - Font shutdown leaks when CLEANUP_MEMORY is not enabled.
+         "leak:libfontconfig.so\n"
+         "leak:libfreetype.so\n"
+         "leak:GI___strdup\n"
+         // The symbol is really __GI___strdup, but if you have the leading _,
+         // it doesn't suppress it.
+
+         // Bug 1078015 - If the process terminates during a PR_Sleep, LSAN
+         // detects a leak
+         "leak:PR_Sleep\n"
+
+         // Bug 1363976 - Stylo holds some global data alive forever.
+         "leak:style::global_style_data\n"
+         "leak:style::sharing::SHARING_CACHE_KEY\n"
+         "leak:style::bloom::BLOOM_KEY\n"
+
+         //
+         // Many leaks only affect some test suites.  The suite annotations are
+         // not checked.
+         //
+
+         // Bug 979928 - WebRTC leaks in different mochitest suites.
+         "leak:NR_reg_init\n"
+         // nr_reg_local_init should be redundant with NR_reg_init, but on
+         // Aurora we get fewer stack frames for some reason.
+         "leak:nr_reg_local_init\n"
+         "leak:r_log_register\n"
+         "leak:nr_reg_set\n"
+
+         // This is a one-time leak in mochitest-bc, so it is probably okay to
+         // ignore.
+         "leak:GlobalPrinters::InitializeGlobalPrinters\n"
+         "leak:nsPSPrinterList::GetPrinterList\n"
+
+         // Bug 1028456 - Various NSPR fd-related leaks in different mochitest
+         // suites.
+         "leak:_PR_Getfd\n"
+
+         // Bug 1028483 - The XML parser sometimes leaks an object. Mostly
+         // happens in toolkit/components/thumbnails.
+         "leak:processInternalEntity\n"
+
+         // Bug 1187421 - NSS does not always free the error stack in different
+         // mochitest suites.
+         "leak:nss_ClearErrorStack\n"
+
+         // Bug 1602689 - leak at mozilla::NotNull, RacyRegisteredThread,
+         // RegisteredThread::RegisteredThread, mozilla::detail::UniqueSelector
+         "leak:RegisteredThread::RegisteredThread\n"
+
+         //
+         // Leaks with system libraries in their stacks. These show up across a
+         // number of tests. Better symbols and disabling fast stackwalking may
+         // help diagnose these.
+         //
+         "leak:libcairo.so\n"
+         // https://github.com/OpenPrinting/cups/pull/317
+         "leak:libcups.so\n"
+         "leak:libdl.so\n"
+         "leak:libdricore.so\n"
+         "leak:libdricore9.2.1.so\n"
+         "leak:libGL.so\n"
+         "leak:libEGL_mesa.so\n"
+         "leak:libglib-2.0.so\n"
+         "leak:libglsl.so\n"
+         "leak:libp11-kit.so\n"
+         "leak:libpixman-1.so\n"
+         "leak:libpulse.so\n"
+         // lubpulsecommon 1.1 is Ubuntu 12.04
+         "leak:libpulsecommon-1.1.so\n"
+         // lubpulsecommon 1.1 is Ubuntu 16.04
+         "leak:libpulsecommon-8.0.so\n"
+         "leak:libresolv.so\n"
+         "leak:libstdc++.so\n"
+         "leak:libXrandr.so\n"
+         "leak:libX11.so\n"
+         "leak:pthread_setspecific_internal\n"
+         "leak:swrast_dri.so\n"
+
+         "leak:js::frontend::BytecodeEmitter:\n"
+         "leak:js::frontend::GeneralParser\n"
+         "leak:js::frontend::Parse\n"
+         "leak:xpc::CIGSHelper\n"
+         "leak:mozJSModuleLoader\n"
+         "leak:mozilla::xpcom::ConstructJSMComponent\n"
+         "leak:XPCWrappedNativeJSOps\n"
+
+      // End of suppressions.
+      ;  // Please keep this semicolon.
+}
+
+#endif  // _MSC_VER
diff --git a/mozglue/build/BionicGlue.cpp b/mozglue/build/BionicGlue.cpp
new file mode 100644
index 0000000000..8cc21b54e5
--- /dev/null
+++ b/mozglue/build/BionicGlue.cpp
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 <sys/types.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#define NS_EXPORT __attribute__((visibility("default")))
+
+extern "C" NS_EXPORT int raise(int sig) {
+  // Bug 741272: Bionic incorrectly uses kill(), which signals the
+  // process, and thus could signal another thread (and let this one
+  // return "successfully" from raising a fatal signal).
+  //
+  // Bug 943170: POSIX specifies pthread_kill(pthread_self(), sig) as
+  // equivalent to raise(sig), but Bionic also has a bug with these
+  // functions, where a forked child will kill its parent instead.
+
+  extern pid_t gettid(void);
+  return syscall(__NR_tgkill, getpid(), gettid(), sig);
+}
+
+/* Flash plugin uses symbols that are not present in Android >= 4.4 */
+namespace android {
+namespace VectorImpl {
+NS_EXPORT void reservedVectorImpl1(void) {}
+NS_EXPORT void reservedVectorImpl2(void) {}
+NS_EXPORT void reservedVectorImpl3(void) {}
+NS_EXPORT void reservedVectorImpl4(void) {}
+NS_EXPORT void reservedVectorImpl5(void) {}
+NS_EXPORT void reservedVectorImpl6(void) {}
+NS_EXPORT void reservedVectorImpl7(void) {}
+NS_EXPORT void reservedVectorImpl8(void) {}
+}  // namespace VectorImpl
+}  // namespace android
diff --git a/mozglue/build/IAccessible32.manifest b/mozglue/build/IAccessible32.manifest
new file mode 100644
index 0000000000..a5230a545f
--- /dev/null
+++ b/mozglue/build/IAccessible32.manifest
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <assemblyIdentity type="win32" name="Mozilla.Firefox.mozglue" version="1.0.0.0" />
+  <file name="mozglue.dll" />
+  <comInterfaceExternalProxyStub
+      iid="{618736E0-3C3D-11CF-810C-00AA00389B71}"
+      proxyStubClsid32="{00020424-0000-0000-C000-000000000046}"
+      name="IAccessible"
+      tlbid="{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}"
+  />
+</assembly>
diff --git a/mozglue/build/IAccessible64.manifest b/mozglue/build/IAccessible64.manifest
new file mode 100644
index 0000000000..3fbb1adaa1
--- /dev/null
+++ b/mozglue/build/IAccessible64.manifest
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <assemblyIdentity type="win32" name="Mozilla.Firefox.mozglue" version="1.0.0.0" />
+  <file name="mozglue.dll" />
+  <comInterfaceExternalProxyStub
+      iid="{618736E0-3C3D-11CF-810C-00AA00389B71}"
+      proxyStubClsid32="{03022430-ABC4-11D0-BDE2-00AA001A1953}"
+      name="IAccessible"
+  />
+</assembly>
diff --git a/mozglue/build/Makefile.in b/mozglue/build/Makefile.in
new file mode 100644
index 0000000000..558ceba066
--- /dev/null
+++ b/mozglue/build/Makefile.in
@@ -0,0 +1,15 @@
+#
+# 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/.
+
+# For FORCE_SHARED_LIB
+include $(topsrcdir)/config/config.mk
+
+ifeq (WINNT,$(OS_TARGET))
+# Rebuild mozglue.dll if the manifest changes - it's included by mozglue.rc.
+# (this dependency should really be just for mozglue.dll, not other targets)
+# Note the manifest file exists in the tree, so we use the explicit filename
+# here.
+EXTRA_DEPS += $(srcdir)/mozglue.dll.manifest
+endif
diff --git a/mozglue/build/TsanOptions.cpp b/mozglue/build/TsanOptions.cpp
new file mode 100644
index 0000000000..e94f5a04d0
--- /dev/null
+++ b/mozglue/build/TsanOptions.cpp
@@ -0,0 +1,302 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/Attributes.h"
+#include "mozilla/TsanOptions.h"
+
+#ifndef _MSC_VER  // Not supported by clang-cl yet
+
+//
+// When running with ThreadSanitizer, we sometimes need to suppress existing
+// races. However, in any case, it should be either because
+//
+//    1) a bug is on file. In this case, the bug number should always be
+//       included with the suppression.
+//
+// or 2) this is an intentional race. Please be very careful with judging
+//       races as intentional and benign. Races in C++ are undefined behavior
+//       and compilers increasingly rely on exploiting this for optimizations.
+//       Hence, many seemingly benign races cause harmful or unexpected
+//       side-effects.
+//
+//       See also:
+//       https://software.intel.com/en-us/blogs/2013/01/06/benign-data-races-what-could-possibly-go-wrong
+//
+//
+// Also, when adding any race suppressions here, make sure to always add
+// a signature for each of the two race stacks. Sometimes, TSan fails to
+// symbolize one of the two traces and this can cause suppressed races to
+// show up intermittently.
+//
+// clang-format off
+extern "C" const char* __tsan_default_suppressions() {
+  return "# Add your suppressions below\n"
+
+         // External uninstrumented libraries
+         MOZ_TSAN_DEFAULT_EXTLIB_SUPPRESSIONS
+
+         // TSan internals
+         "race:__tsan::ProcessPendingSignals\n"
+         "race:__tsan::CallUserSignalHandler\n"
+
+
+
+
+
+         // Uninstrumented code causing false positives
+
+         // These libraries are uninstrumented and cause mutex false positives.
+         // However, they can be unloaded by GTK early which we cannot avoid.
+         "mutex:libGL.so\n"
+         "mutex:libGLdispatch\n"
+         "mutex:libGLX\n"
+         // Bug 1637707 - permanent
+         "mutex:libEGL_mesa.so\n"
+         // ~GLContextGLX unlocks a libGL mutex.
+         "mutex:GLContextGLX::~GLContextGLX\n"
+         // Bug 1651446 - permanent (ffmpeg)
+         "race:libavcodec.so*\n"
+         "race:libavutil.so*\n"
+         // For some reason, the suppressions on libpulse.so
+         // through `called_from_lib` only work partially.
+         "race:libpulse.so\n"
+         "race:pa_context_suspend_source_by_index\n"
+         "race:pa_context_unref\n"
+         "race:pa_format_info_set_prop_string_array\n"
+         "race:pa_stream_get_index\n"
+         "race:pa_stream_update_timing_info\n"
+         // This is a callback from libglib-2 that is apparently
+         // not fully suppressed through `called_from_lib`.
+         "race:g_main_context_dispatch\n"
+         // This is likely a false positive involving a mutex from GTK.
+         // See also bug 1642653 - permanent.
+         "mutex:GetMaiAtkType\n"
+         // Bug 1688716 - Failure due to fire_glxtest_process
+         // calling into uninstrumented external graphics driver code.
+         // For example: iris_dri.so and swrast_dri.so.
+         "race:fire_glxtest_process\n"
+         // Bug 1722721 - WebRender using uninstrumented Mesa drivers
+         "race:swrast_dri.so\n"
+
+
+
+
+         // Deadlock reports on single-threaded runtime.
+         //
+         // This is a known false positive from TSan where it reports
+         // a potential deadlock even though all mutexes are only
+         // taken by a single thread. For applications/tasks where we
+         // are absolutely sure that no second thread will be involved
+         // we should suppress these issues.
+         //
+         // See also https://github.com/google/sanitizers/issues/488
+
+         // Bug 1614605 - permanent
+         "deadlock:SanctionsTestServer\n"
+         "deadlock:OCSPStaplingServer\n"
+         // Bug 1643087 - permanent
+         "deadlock:BadCertAndPinningServer\n"
+         // Bug 1606804 - permanent
+         "deadlock:cert_storage::SecurityState::open_db\n"
+         "deadlock:cert_storage::SecurityState::add_certs\n"
+         // Bug 1651770 - permanent
+         "deadlock:mozilla::camera::LockAndDispatch\n"
+         // Bug 1606804 - permanent
+         "deadlock:third_party/rust/rkv/src/env.rs\n"
+         // Bug 1680655 - permanent
+         "deadlock:EncryptedClientHelloServer\n"
+         // Bug 1682861 - permanent
+         "deadlock:nsDOMWindowUtils::CompareCanvases\n"
+
+
+
+
+
+         // Benign races in third-party code (should be fixed upstream)
+
+         // No Bug - permanent
+         // No Upstream Bug Filed!
+         //
+         // SIMD Initialization in libjpeg, potentially runs
+         // initialization twice, but otherwise benign. Init
+         // routine itself is in native assembler.
+         "race:init_simd\n"
+         "race:simd_support\n"
+         "race:jsimd_can_ycc_rgb\n"
+         // Bug 1615228 - permanent
+         // No Upstream Bug Filed!
+         //
+         // Likely benign race in ipc/chromium/ where we set
+         // `message_loop_` to `NULL` on two threads when stopping
+         // a thread at the same time it is already finishing.
+         "race:base::Thread::Stop\n"
+         // Bug 1615569 - permanent
+         // No Upstream Bug Filed!
+         //
+         // NSS is using freebl from two different threads but freebl isn't
+         // that threadsafe.
+         "race:mp_exptmod.max_window_bits\n"
+         // Bug 1652499 - permanent
+         // No Upstream Bug Filed!
+         //
+         // Likely benign race in webrtc.org code - race while updating the
+         // minimum log severity.
+         "race:Loggable\n"
+         "race:UpdateMinLogSeverity\n"
+         // Bug 1652174 - permanent
+         // Upstream Bug: https://github.com/libevent/libevent/issues/777
+         //
+         // Likely benign write-write race in libevent to set a sticky boolean
+         // flag to true.
+         "race:event_debug_mode_too_late\n"
+
+         // Bug 1653618 - permanent
+         // Upstream Bug: https://github.com/sctplab/usrsctp/issues/507
+         //
+         // Might lead to scheduled timers in libusrsctp getting dropped?
+         "race:sctp_handle_tick\n"
+         "race:sctp_handle_sack\n"
+         // Bug 1648604 - permanent
+         // Upstream Bug: https://github.com/sctplab/usrsctp/issues/482
+         //
+         // Likely benign race in libusrsctp allocator during a free.
+         "race:system_base_info\n"
+         // Benign lock-order-inversion in libusrsctp
+         // No upstream bug filed!
+         "deadlock:sctp_add_to_readq\n"
+
+         // Bug 1153409 - permanent
+         // No Upstream Bug Filed!
+         //
+         // Probably benign - sqlite has a few optimizations where it does
+         // racy reads and then does properly synchronized integrity checks
+         // afterwards. Some concern of compiler optimizations messing this
+         // up due to "volatile" being too weak for this.
+         "race:third_party/sqlite3/*\n"
+         "deadlock:third_party/sqlite3/*\n"
+         // Bug 1674770 - permanent
+         // Upstream Bug: https://github.com/Amanieu/parking_lot/issues/257
+         //
+         // parking_lot using incorrect atomic orderings in RwLock, upstream
+         // fix already up for review.
+         "race:StrongRuleNode::ensure_child\n"
+         // No Bug - permanent
+         // Upstream Bugs:
+         //
+         //  * https://github.com/rayon-rs/rayon/issues/812
+         //  * https://github.com/crossbeam-rs/crossbeam/issues/589
+         //
+         // Probably a false-positive from crossbeam's deque not being
+         // understood by tsan.
+         "race:crossbeam_deque*::resize\n"
+         "race:crossbeam_deque*::push\n"
+         "race:crossbeam_deque*::write\n"
+         "race:crossbeam_deque*::read\n"
+         "race:crossbeam_deque*::steal\n"
+         // Bug 1805819 - permanent
+         // No Upstream Bug Filed!
+         //
+         // False positive in libc's tzset_internal
+         // See https://crbug.com/379738 also
+         "race:tzset_internal\n"
+
+
+
+
+
+         // The rest of these suppressions are miscellaneous issues in gecko
+         // that should be investigated and ideally fixed.
+
+         // Bug 1671574 - Permanent
+         // The StartupCache thread intentionally races with the main thread to
+         // trigger OS-level paging. It is never joined with the main thread.
+         "thread:StartupCache\n"
+
+         // Bug 1734262 - Permanent
+         // When spawning async processes, we create a helper thread to wait for
+         // the process to terminate in order to asynchronously report the exit
+         // code to Gecko. This thread waits on a syscall for the process to end,
+         // which means there's no easy way to cancel and join it during Gecko
+         // shutdown. Suppress thread leak reports for this thread.
+         "thread:CreateMonitorThread\n"
+
+         // Bug 1601600
+         "race:SkARGB32_Blitter\n"
+         "race:SkARGB32_Shader_Blitter\n"
+         "race:SkARGB32_Opaque_Blitter\n"
+         "race:SkRasterPipelineBlitter\n"
+         "race:Clamp_S32_D32_nofilter_trans_shaderproc\n"
+         "race:SkSpriteBlitter_Memcpy\n"
+
+         // Bug 1606800
+         "race:CallInitFunc\n"
+
+         // Bug 1606803
+         "race:ipv6_is_present\n"
+
+         // Bug 1615123
+         "race:_dl_deallocate_tls\n"
+         "race:__libc_memalign\n"
+
+         // Bug 1664803
+         "race:Sampler::sSigHandlerCoordinator\n"
+
+         // Bug 1656068
+         "race:WebRtcAec_Create\n"
+
+         // No Bug - Logging bug in Mochitests
+         "race:mochitest/ssltunnel/ssltunnel.cpp\n"
+
+         // This thread does not seem to be stopped/joined.
+         // ImageBridgeChild should be turned back into a background
+         // task queue in bug 1647628, in which case these suppressions
+         // can be removed.
+         "race:mozilla::layers::ImageBridgeChild::ShutDown\n"
+
+         // Bug 1652530
+         "mutex:XErrorTrap\n"
+
+         // Bug 1671601
+         "race:CamerasParent::ActorDestroy\n"
+         "race:CamerasParent::DispatchToVideoCaptureThread\n"
+
+         // Bug 1623541
+         "race:VRShMem::PullSystemState\n"
+         "race:VRShMem::PushSystemState\n"
+         "race:VRShMem::PullBrowserState\n"
+         "race:VRShMem::PushBrowserState\n"
+
+         // Bug 1682951
+         "race:storage::Connection::Release\n"
+
+         // Bug 1683357
+         "race:image::ImageSurfaceCache::SuggestedSizeInternal\n"
+         "race:image::RasterImage::SetMetadata\n"
+         "race:image::RasterImage::GetWidth\n"
+
+         // Bug 1722721 - This is a benign race creating worker/SW compositor threads.
+         "race:webrender::profiler::register_thread\n"
+
+         // Bug 1722721 - This is a false positive during SW-WR rendering.
+         "race:scale_blit\n"
+
+         "race:mozilla::gl::MesaMemoryLeakWorkaround\n"
+
+         // Bug 1733908
+         "race:js::wasm::Code::bestTier\n"
+         "race:js::wasm::Code::commitTier2\n"
+         "race:js::wasm::Code::setTier2\n"
+         "race:js::wasm::Code::setAndBorrowTier2\n"
+
+         // Bug 1755449
+         // The Glean init thread is used to perform I/O and other blocking operations.
+         // It is never joined with the main thread, but this is being re-evaluated.
+         "thread:glean::initialize\n"
+
+      // End of suppressions.
+      ;  // Please keep this semicolon.
+}
+// clang-format on
+#endif  // _MSC_VER
diff --git a/mozglue/build/UbsanOptions.cpp b/mozglue/build/UbsanOptions.cpp
new file mode 100644
index 0000000000..547baa790c
--- /dev/null
+++ b/mozglue/build/UbsanOptions.cpp
@@ -0,0 +1,16 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/Attributes.h"
+
+#ifndef _MSC_VER  // Not supported by clang-cl yet
+
+extern "C" const char* __ubsan_default_options() {
+  return "print_stacktrace=1";
+}
+
+extern "C" const char* __ubsan_default_suppressions() { return ""; }
+
+#endif
diff --git a/mozglue/build/arm-eabi-filter b/mozglue/build/arm-eabi-filter
new file mode 100644
index 0000000000..401454ee88
--- /dev/null
+++ b/mozglue/build/arm-eabi-filter
@@ -0,0 +1,4 @@
+{
+  local:
+    __aeabi*;
+};
diff --git a/mozglue/build/arm.cpp b/mozglue/build/arm.cpp
new file mode 100644
index 0000000000..a74a41f6c0
--- /dev/null
+++ b/mozglue/build/arm.cpp
@@ -0,0 +1,131 @@
+/* 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/. */
+
+/* compile-time and runtime tests for whether to use various ARM extensions */
+
+#include "arm.h"
+
+#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+
+// arm.h has parallel #ifs which declare MOZILLA_ARM_HAVE_CPUID_DETECTION.
+// We don't check it here so that we get compile errors if it's defined, but
+// we don't compile one of these detection methods. The detection code here is
+// based on the CPU detection in libtheora.
+
+#  if defined(__linux__) || defined(ANDROID)
+#    include <stdio.h>
+#    include <stdlib.h>
+#    include <string.h>
+
+enum {
+  MOZILLA_HAS_EDSP_FLAG = 1,
+  MOZILLA_HAS_ARMV6_FLAG = 2,
+  MOZILLA_HAS_ARMV7_FLAG = 4,
+  MOZILLA_HAS_NEON_FLAG = 8
+};
+
+static unsigned get_arm_cpu_flags(void) {
+  unsigned flags;
+  FILE* fin;
+  bool armv6_processor = false;
+  flags = 0;
+  /*Reading /proc/self/auxv would be easier, but that doesn't work reliably on
+    Android. This also means that detection will fail in Scratchbox, which is
+    desirable, as NEON does not work in the qemu shipped with the Maemo 5 SDK.
+    I don't know if /proc/self/auxv would do any better in that case, anyway,
+    or if it would return random flags from the host CPU.*/
+  fin = fopen("/proc/cpuinfo", "r");
+  if (fin != nullptr) {
+    /*512 should be enough for anybody (it's even enough for all the flags that
+      x86 has accumulated... so far).*/
+    char buf[512];
+    while (fgets(buf, 511, fin) != nullptr) {
+      if (memcmp(buf, "Features", 8) == 0) {
+        char* p;
+        p = strstr(buf, " edsp");
+        if (p != nullptr && (p[5] == ' ' || p[5] == '\n'))
+          flags |= MOZILLA_HAS_EDSP_FLAG;
+        p = strstr(buf, " neon");
+        if (p != nullptr && (p[5] == ' ' || p[5] == '\n'))
+          flags |= MOZILLA_HAS_NEON_FLAG;
+      }
+      if (memcmp(buf, "CPU architecture:", 17) == 0) {
+        int version;
+        version = atoi(buf + 17);
+        if (version >= 6) flags |= MOZILLA_HAS_ARMV6_FLAG;
+        if (version >= 7) flags |= MOZILLA_HAS_ARMV7_FLAG;
+      }
+      /* media/webrtc/trunk/src/system_wrappers/source/cpu_features_arm.c
+       * Unfortunately, it seems that certain ARMv6-based CPUs
+       * report an incorrect architecture number of 7!
+       *
+       * We try to correct this by looking at the 'elf_format'
+       * field reported by the 'Processor' field, which is of the
+       * form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for
+       * an ARMv6-one.
+       */
+      if (memcmp(buf, "Processor\t:", 11) == 0) {
+        if (strstr(buf, "(v6l)") != 0) {
+          armv6_processor = true;
+        }
+      }
+    }
+    fclose(fin);
+  }
+  if (armv6_processor) {
+    // ARMv6 pretending to be ARMv7? clear flag
+    if (flags & MOZILLA_HAS_ARMV7_FLAG) {
+      flags &= ~MOZILLA_HAS_ARMV7_FLAG;
+    }
+  }
+  return flags;
+}
+
+// Cache a local copy so we only have to read /proc/cpuinfo once.
+static unsigned arm_cpu_flags = get_arm_cpu_flags();
+
+#    if !defined(MOZILLA_PRESUME_EDSP)
+static bool check_edsp(void) {
+  return (arm_cpu_flags & MOZILLA_HAS_EDSP_FLAG) != 0;
+}
+#    endif
+
+#    if !defined(MOZILLA_PRESUME_ARMV6)
+static bool check_armv6(void) {
+  return (arm_cpu_flags & MOZILLA_HAS_ARMV6_FLAG) != 0;
+}
+#    endif
+
+#    if !defined(MOZILLA_PRESUME_ARMV7)
+static bool check_armv7(void) {
+  return (arm_cpu_flags & MOZILLA_HAS_ARMV7_FLAG) != 0;
+}
+#    endif
+
+#    if !defined(MOZILLA_PRESUME_NEON)
+static bool check_neon(void) {
+  return (arm_cpu_flags & MOZILLA_HAS_NEON_FLAG) != 0;
+}
+#    endif
+
+#  endif  // defined(__linux__) || defined(ANDROID)
+
+namespace mozilla {
+namespace arm_private {
+#  if !defined(MOZILLA_PRESUME_EDSP)
+bool edsp_enabled = check_edsp();
+#  endif
+#  if !defined(MOZILLA_PRESUME_ARMV6)
+bool armv6_enabled = check_armv6();
+#  endif
+#  if !defined(MOZILLA_PRESUME_ARMV7)
+bool armv7_enabled = check_armv7();
+#  endif
+#  if !defined(MOZILLA_PRESUME_NEON)
+bool neon_enabled = check_neon();
+#  endif
+}  // namespace arm_private
+}  // namespace mozilla
+
+#endif  // MOZILLA_ARM_HAVE_CPUID_DETECTION
diff --git a/mozglue/build/arm.h b/mozglue/build/arm.h
new file mode 100644
index 0000000000..8600329931
--- /dev/null
+++ b/mozglue/build/arm.h
@@ -0,0 +1,145 @@
+/* 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/. */
+
+/* compile-time and runtime tests for whether to use SSE instructions */
+
+#ifndef mozilla_arm_h_
+#define mozilla_arm_h_
+
+// for definition of MFBT_DATA
+#include "mozilla/Types.h"
+
+/* This is patterned after SSE.h, but provides ARMv5E, ARMv6, and NEON
+   detection. For reasons similar to the SSE code, code using NEON (even just
+   in inline asm) needs to be in a separate compilation unit from the regular
+   code, because it requires an ".fpu neon" directive which can't be undone.
+   ARMv5E and ARMv6 code may also require an .arch directive, since by default
+   the assembler refuses to generate code for opcodes outside of its current
+   .arch setting.
+
+   TODO: Add Thumb, Thumb2, VFP, iwMMX, etc. detection, if we need it. */
+
+#if defined(__GNUC__) && defined(__arm__)
+
+#  define MOZILLA_ARM_ARCH 3
+
+#  if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || \
+      defined(_ARM_ARCH_4)
+#    undef MOZILLA_ARM_ARCH
+#    define MOZILLA_ARM_ARCH 4
+#  endif
+
+#  if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) ||   \
+      defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) || \
+      defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
+#    undef MOZILLA_ARM_ARCH
+#    define MOZILLA_ARM_ARCH 5
+#  endif
+
+#  if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) ||    \
+      defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) ||   \
+      defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) || \
+      defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
+#    undef MOZILLA_ARM_ARCH
+#    define MOZILLA_ARM_ARCH 6
+#  endif
+
+#  if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) ||  \
+      defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || \
+      defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
+#    undef MOZILLA_ARM_ARCH
+#    define MOZILLA_ARM_ARCH 7
+#  endif
+
+#  ifdef __GNUC__
+#    define MOZILLA_MAY_SUPPORT_EDSP 1
+
+#    if defined(HAVE_ARM_SIMD)
+#      define MOZILLA_MAY_SUPPORT_ARMV6 1
+#    endif
+
+#    if defined(HAVE_ARM_NEON)
+#      define MOZILLA_MAY_SUPPORT_NEON 1
+#    endif
+
+#    if defined(HAVE_ARM_SIMD)
+#      define MOZILLA_MAY_SUPPORT_ARMV7 1
+#    endif
+#  endif
+
+// Currently we only have CPU detection for Linux via /proc/cpuinfo
+#  if defined(__linux__) || defined(ANDROID)
+#    define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
+#  endif
+
+#endif
+
+// When using -mfpu=neon on arm gcc, or using default on aarch64,
+// the compiler generates neon instructions.
+#if defined(__ARM_NEON)
+#  define MOZILLA_PRESUME_NEON 1
+#endif
+
+namespace mozilla {
+
+namespace arm_private {
+#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+#  if !defined(MOZILLA_PRESUME_EDSP)
+extern bool MFBT_DATA edsp_enabled;
+#  endif
+#  if !defined(MOZILLA_PRESUME_ARMV6)
+extern bool MFBT_DATA armv6_enabled;
+#  endif
+#  if !defined(MOZILLA_PRESUME_ARMV7)
+extern bool MFBT_DATA armv7_enabled;
+#  endif
+#  if !defined(MOZILLA_PRESUME_NEON)
+extern bool MFBT_DATA neon_enabled;
+#  endif
+#endif
+}  // namespace arm_private
+
+#if defined(MOZILLA_PRESUME_EDSP)
+#  define MOZILLA_MAY_SUPPORT_EDSP 1
+inline bool supports_edsp() { return true; }
+#elif defined(MOZILLA_MAY_SUPPORT_EDSP) && \
+    defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+inline bool supports_edsp() { return arm_private::edsp_enabled; }
+#else
+inline bool supports_edsp() { return false; }
+#endif
+
+#if defined(MOZILLA_PRESUME_ARMV6)
+#  define MOZILLA_MAY_SUPPORT_ARMV6 1
+inline bool supports_armv6() { return true; }
+#elif defined(MOZILLA_MAY_SUPPORT_ARMV6) && \
+    defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+inline bool supports_armv6() { return arm_private::armv6_enabled; }
+#else
+inline bool supports_armv6() { return false; }
+#endif
+
+#if defined(MOZILLA_PRESUME_ARMV7)
+#  define MOZILLA_MAY_SUPPORT_ARMV7 1
+inline bool supports_armv7() { return true; }
+#elif defined(MOZILLA_MAY_SUPPORT_ARMV7) && \
+    defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+inline bool supports_armv7() { return arm_private::armv7_enabled; }
+#else
+inline bool supports_armv7() { return false; }
+#endif
+
+#if defined(MOZILLA_PRESUME_NEON)
+#  define MOZILLA_MAY_SUPPORT_NEON 1
+inline bool supports_neon() { return true; }
+#elif defined(MOZILLA_MAY_SUPPORT_NEON) && \
+    defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
+inline bool supports_neon() { return arm_private::neon_enabled; }
+#else
+inline bool supports_neon() { return false; }
+#endif
+
+}  // namespace mozilla
+
+#endif /* !defined(mozilla_arm_h_) */
diff --git a/mozglue/build/dummy.cpp b/mozglue/build/dummy.cpp
new file mode 100644
index 0000000000..c6b1ccd808
--- /dev/null
+++ b/mozglue/build/dummy.cpp
@@ -0,0 +1,5 @@
+/* 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/. */
+
+void _dummy(void) {}
diff --git a/mozglue/build/mips.cpp b/mozglue/build/mips.cpp
new file mode 100644
index 0000000000..7166080f5e
--- /dev/null
+++ b/mozglue/build/mips.cpp
@@ -0,0 +1,42 @@
+/* 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/. */
+
+/* compile-time and runtime tests for whether to use MIPS-specific extensions */
+
+#include "mips.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+enum {
+  MIPS_FLAG_LOONGSON3 = 1,
+};
+
+static unsigned get_mips_cpu_flags(void) {
+  unsigned flags = 0;
+  FILE* fin;
+
+  fin = fopen("/proc/cpuinfo", "r");
+  if (fin != nullptr) {
+    char buf[1024];
+    memset(buf, 0, sizeof(buf));
+    fread(buf, sizeof(char), sizeof(buf) - 1, fin);
+    fclose(fin);
+    if (strstr(buf, "Loongson-3")) flags |= MIPS_FLAG_LOONGSON3;
+  }
+  return flags;
+}
+
+static bool check_loongson3(void) {
+  // Cache a local copy so we only have to read /proc/cpuinfo once.
+  static unsigned mips_cpu_flags = get_mips_cpu_flags();
+  return (mips_cpu_flags & MIPS_FLAG_LOONGSON3) != 0;
+}
+
+namespace mozilla {
+namespace mips_private {
+bool isLoongson3 = check_loongson3();
+}  // namespace mips_private
+}  // namespace mozilla
diff --git a/mozglue/build/mips.h b/mozglue/build/mips.h
new file mode 100644
index 0000000000..a7c3ed5416
--- /dev/null
+++ b/mozglue/build/mips.h
@@ -0,0 +1,29 @@
+/* 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/. */
+
+/* compile-time and runtime tests for whether to use MIPS-specific extensions */
+
+#ifndef mozilla_mips_h_
+#define mozilla_mips_h_
+
+// for definition of MFBT_DATA
+#include "mozilla/Types.h"
+
+namespace mozilla {
+
+namespace mips_private {
+extern bool MFBT_DATA isLoongson3;
+}  // namespace mips_private
+
+inline bool supports_mmi() {
+#ifdef __mips__
+  return mips_private::isLoongson3;
+#else
+  return false;
+#endif
+}
+
+}  // namespace mozilla
+
+#endif /* !defined(mozilla_mips_h_) */
diff --git a/mozglue/build/moz.build b/mozglue/build/moz.build
new file mode 100644
index 0000000000..a68393740f
--- /dev/null
+++ b/mozglue/build/moz.build
@@ -0,0 +1,127 @@
+# -*- 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/.
+
+# Build mozglue as a shared lib on Windows, OSX and Android. But not for
+# embedders!
+# If this is ever changed, update MOZ_SHARED_MOZGLUE in browser/installer/Makefile.in
+if CONFIG["JS_STANDALONE"] and not CONFIG["MOZ_MEMORY"]:
+    Library("mozglue")
+elif CONFIG["OS_TARGET"] in ("WINNT", "Darwin", "Android"):
+    SharedLibrary("mozglue")
+else:
+    Library("mozglue")
+
+if CONFIG["OS_TARGET"] == "Android":
+    LDFLAGS += ["-Wl,--version-script,%s/mozglue.ver" % SRCDIR]
+    SOURCES += [
+        "BionicGlue.cpp",
+    ]
+
+if CONFIG["MOZ_ASAN"]:
+    SOURCES += [
+        "AsanOptions.cpp",
+    ]
+
+if CONFIG["MOZ_UBSAN"]:
+    SOURCES += [
+        "UbsanOptions.cpp",
+    ]
+
+if CONFIG["MOZ_TSAN"]:
+    SOURCES += [
+        "TsanOptions.cpp",
+    ]
+
+if CONFIG["OS_TARGET"] == "WINNT":
+    if CONFIG["MOZ_MEMORY"]:
+        DEFFILE = "mozglue.def"
+    OS_LIBS += [
+        "advapi32",
+        "user32",
+        "winmm",
+        "uuid",
+    ]
+    # We'll break the DLL blocklist if we immediately load user32.dll.
+    # For the same reason, we delayload these other DLLs to avoid eager
+    # dependencies on user32.dll.
+    DELAYLOAD_DLLS += [
+        "advapi32.dll",
+        "dbghelp.dll",
+        "oleaut32.dll",
+        "ole32.dll",
+        "user32.dll",
+        "version.dll",
+        "winmm.dll",
+    ]
+
+if CONFIG["MOZ_WIDGET_TOOLKIT"]:
+
+    if CONFIG["MOZ_MEMORY"] and FORCE_SHARED_LIB:
+        pass
+        # TODO: SHARED_LIBRARY_LIBS go here
+    else:
+        # Temporary, until bug 662814 lands
+        NoVisibilityFlags()
+        SOURCES += [
+            "dummy.cpp",
+        ]
+
+    if CONFIG["OS_TARGET"] == "WINNT":
+        LOCAL_INCLUDES += [
+            "/memory/build",
+        ]
+
+    EXPORTS.mozilla += [
+        "arm.h",
+        "mips.h",
+        "ppc.h",
+    ]
+
+    if CONFIG["CPU_ARCH"] == "arm":
+        SOURCES += [
+            "arm.cpp",
+        ]
+
+    if CONFIG["CPU_ARCH"].startswith("mips"):
+        SOURCES += [
+            "mips.cpp",
+        ]
+
+    if CONFIG["CPU_ARCH"].startswith("ppc"):
+        SOURCES += [
+            "ppc.cpp",
+        ]
+
+    if CONFIG["MOZ_LINKER"]:
+        USE_LIBS += [
+            "zlib",
+        ]
+
+USE_LIBS += [
+    "mfbt",
+]
+
+if CONFIG["OS_ARCH"] == "WINNT":
+    RCINCLUDE = "/mozglue/mozglue.rc"
+
+    if not CONFIG["HAVE_64BIT_BUILD"]:
+        EXPORTS += [
+            "IAccessible32.manifest",
+        ]
+
+    EXPORTS += [
+        "IAccessible64.manifest",
+    ]
+
+LIBRARY_DEFINES["IMPL_MFBT"] = True
+LIBRARY_DEFINES["MOZ_HAS_MOZGLUE"] = True
+
+if CONFIG["MOZ_LINKER"] and CONFIG["CPU_ARCH"] == "arm":
+    LDFLAGS += ["-Wl,-version-script,%s/arm-eabi-filter" % SRCDIR]
+
+DIST_INSTALL = True
+
+include("replace_malloc.mozbuild")
diff --git a/mozglue/build/mozglue.def b/mozglue/build/mozglue.def
new file mode 100644
index 0000000000..188037b9f1
--- /dev/null
+++ b/mozglue/build/mozglue.def
@@ -0,0 +1,22 @@
+; 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/.
+
+LIBRARY mozglue.dll
+
+EXPORTS
+  ; symbols that are actually useful
+  malloc=je_malloc
+  calloc=je_calloc
+  realloc=je_realloc
+  free=je_free
+  posix_memalign=je_posix_memalign
+  malloc_usable_size=je_malloc_usable_size
+  malloc_good_size=je_malloc_good_size
+  _aligned_free=je_free
+  _aligned_malloc=wrap__aligned_malloc
+  strndup=wrap_strndup
+  strdup=wrap_strdup
+  _strdup=wrap_strdup
+  wcsdup=wrap_wcsdup
+  _wcsdup=wrap_wcsdup
diff --git a/mozglue/build/mozglue.dll.manifest b/mozglue/build/mozglue.dll.manifest
new file mode 100644
index 0000000000..037eae4f77
--- /dev/null
+++ b/mozglue/build/mozglue.dll.manifest
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+<assemblyIdentity
+    version="1.0.0.0"
+    name="mozglue"
+    type="win32"
+/>
+<file name="mozglue.dll"/>
+</assembly>
diff --git a/mozglue/build/mozglue.ver b/mozglue/build/mozglue.ver
new file mode 100644
index 0000000000..433d820b36
--- /dev/null
+++ b/mozglue/build/mozglue.ver
@@ -0,0 +1,4 @@
+libmozglue.so {
+global:
+  *;
+};
diff --git a/mozglue/build/ppc.cpp b/mozglue/build/ppc.cpp
new file mode 100644
index 0000000000..20ef121386
--- /dev/null
+++ b/mozglue/build/ppc.cpp
@@ -0,0 +1,64 @@
+/* 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/. */
+
+/* compile-time and runtime tests for whether to use Power ISA-specific
+ * extensions */
+
+#include "ppc.h"
+#include "mozilla/Unused.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(XP_LINUX)
+// Use the getauxval() function if available.
+// ARCH_3_00 wasn't defined until glibc 2.23, so include just in case.
+#  include <sys/auxv.h>
+#  ifndef PPC_FEATURE2_ARCH_3_00
+#    define PPC_FEATURE2_ARCH_3_00 0x00800000
+#  endif
+#endif
+
+const unsigned PPC_FLAG_VMX = 1;
+const unsigned PPC_FLAG_VSX = 2;
+const unsigned PPC_FLAG_VSX3 = 4;
+
+static signed get_ppc_cpu_flags(void) {
+  // This could be expensive, so cache the result.
+  static signed cpu_flags = -1;
+
+  if (cpu_flags > -1) {  // already checked
+    return cpu_flags;
+  }
+  cpu_flags = 0;
+
+#if defined(XP_LINUX)
+  // Try getauxval().
+  unsigned long int cap = getauxval(AT_HWCAP);
+  unsigned long int cap2 = getauxval(AT_HWCAP2);
+
+  if (cap & PPC_FEATURE_HAS_ALTIVEC) {
+    cpu_flags |= PPC_FLAG_VMX;
+  }
+  if (cap & PPC_FEATURE_HAS_VSX) {
+    cpu_flags |= PPC_FLAG_VSX;
+  }
+  if (cap2 & PPC_FEATURE2_ARCH_3_00) {
+    cpu_flags |= PPC_FLAG_VSX3;
+  }
+#else
+  // Non-Linux detection here. Currently, on systems other than Linux,
+  // no CPU SIMD features will be detected.
+#endif
+
+  return cpu_flags;
+}
+
+namespace mozilla {
+namespace ppc_private {
+bool vmx_enabled = !!(get_ppc_cpu_flags() & PPC_FLAG_VMX);
+bool vsx_enabled = !!(get_ppc_cpu_flags() & PPC_FLAG_VSX);
+bool vsx3_enabled = !!(get_ppc_cpu_flags() & PPC_FLAG_VSX3);
+}  // namespace ppc_private
+}  // namespace mozilla
diff --git a/mozglue/build/ppc.h b/mozglue/build/ppc.h
new file mode 100644
index 0000000000..9527d8dadd
--- /dev/null
+++ b/mozglue/build/ppc.h
@@ -0,0 +1,47 @@
+/* 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/. */
+
+/* compile-time and runtime tests for whether to use Power ISA-specific
+   extensions */
+
+#ifndef mozilla_ppc_h_
+#define mozilla_ppc_h_
+
+// for definition of MFBT_DATA
+#include "mozilla/Types.h"
+
+namespace mozilla {
+namespace ppc_private {
+extern bool MFBT_DATA vmx_enabled;
+extern bool MFBT_DATA vsx_enabled;
+extern bool MFBT_DATA vsx3_enabled;
+}  // namespace ppc_private
+
+inline bool supports_vmx() {
+#ifdef __powerpc__
+  return ppc_private::vmx_enabled;
+#else
+  return false;
+#endif
+}
+
+inline bool supports_vsx() {
+#ifdef __powerpc__
+  return ppc_private::vsx_enabled;
+#else
+  return false;
+#endif
+}
+
+inline bool supports_vsx3() {
+#ifdef __powerpc__
+  return ppc_private::vsx3_enabled;
+#else
+  return false;
+#endif
+}
+
+}  // namespace mozilla
+
+#endif /* !defined(mozilla_ppc_h_) */
diff --git a/mozglue/build/replace_malloc.mozbuild b/mozglue/build/replace_malloc.mozbuild
new file mode 100644
index 0000000000..16c8b7271f
--- /dev/null
+++ b/mozglue/build/replace_malloc.mozbuild
@@ -0,0 +1,6 @@
+# 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/.
+
+if CONFIG['OS_TARGET'] == 'Darwin' and CONFIG['MOZ_REPLACE_MALLOC']:
+    LDFLAGS += ['-Wl,-U,_replace_init']