Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 357 insertions, 0 deletions

diff --git a/js/src/vm/Initialization.cpp b/js/src/vm/Initialization.cpp
new file mode 100644
index 0000000000..a0ff682327
--- /dev/null
+++ b/js/src/vm/Initialization.cpp
@@ -0,0 +1,357 @@
+/* -*- 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/. */
+
+/* SpiderMonkey initialization and shutdown code. */
+
+#include "js/Initialization.h"
+
+#include "mozilla/Assertions.h"
+#if JS_HAS_INTL_API
+#  include "mozilla/intl/ICU4CLibrary.h"
+#endif
+#include "mozilla/TextUtils.h"
+
+#include "jstypes.h"
+
+#include "builtin/AtomicsObject.h"
+#include "builtin/TestingFunctions.h"
+#include "gc/Statistics.h"
+#include "jit/Assembler.h"
+#include "jit/Ion.h"
+#include "jit/JitOptions.h"
+#include "jit/Simulator.h"
+#include "js/Utility.h"
+#include "threading/ProtectedData.h"  // js::AutoNoteSingleThreadedRegion
+#include "util/Poison.h"
+#include "vm/ArrayBufferObject.h"
+#include "vm/DateTime.h"
+#include "vm/HelperThreads.h"
+#include "vm/Runtime.h"
+#include "vm/Time.h"
+#ifdef MOZ_VTUNE
+#  include "vtune/VTuneWrapper.h"
+#endif
+#include "wasm/WasmProcess.h"
+
+using js::FutexThread;
+using JS::detail::InitState;
+using JS::detail::libraryInitState;
+
+InitState JS::detail::libraryInitState;
+
+#ifdef DEBUG
+static unsigned MessageParameterCount(const char* format) {
+  unsigned numfmtspecs = 0;
+  for (const char* fmt = format; *fmt != '\0'; fmt++) {
+    if (*fmt == '{' && mozilla::IsAsciiDigit(fmt[1])) {
+      ++numfmtspecs;
+    }
+  }
+  return numfmtspecs;
+}
+
+static void CheckMessageParameterCounts() {
+  // Assert that each message format has the correct number of braced
+  // parameters.
+#  define MSG_DEF(name, count, exception, format) \
+    MOZ_ASSERT(MessageParameterCount(format) == count);
+#  include "js/friend/ErrorNumbers.msg"
+#  undef MSG_DEF
+}
+#endif /* DEBUG */
+
+#if defined(JS_RUNTIME_CANONICAL_NAN)
+namespace JS::detail {
+uint64_t CanonicalizedNaNBits;
+}  // namespace JS::detail
+#endif
+
+static void SetupCanonicalNaN() {
+  // Compute the standard NaN value that the hardware generates.
+  volatile double infinity = mozilla::PositiveInfinity<double>();
+  volatile double hardwareNaN = infinity - infinity;
+  uint64_t hardwareNaNBits = mozilla::BitwiseCast<uint64_t>(hardwareNaN);
+  hardwareNaNBits &= ~mozilla::FloatingPoint<double>::kSignBit;
+
+#if defined(JS_NONCANONICAL_HARDWARE_NAN)
+  // If the NaN generated by hardware operations is not compatible
+  // with our canonical NaN, we must canonicalize every double. This
+  // is implemented for C++ code in Value::bitsFromDouble, but is not
+  // implemented for JIT code.
+#  if !defined(JS_CODEGEN_NONE)
+#    error "No JIT support for non-canonical hardware NaN"
+#  endif
+
+  (void)hardwareNaNBits;
+#elif defined(JS_RUNTIME_CANONICAL_NAN)
+  // Determine canonical NaN at startup. It must still match the ValueIsDouble
+  // requirements.
+  MOZ_RELEASE_ASSERT(JS::detail::ValueIsDouble(hardwareNaNBits));
+  JS::detail::CanonicalizedNaNBits = hardwareNaNBits;
+#else
+  // Assert that the NaN generated by hardware operations is
+  // compatible with the canonical NaN we use for JS::Value. This is
+  // true for all of our supported platforms, but not for SPARC.
+  MOZ_RELEASE_ASSERT(hardwareNaNBits == JS::detail::CanonicalizedNaNBits,
+                     "Unexpected default hardware NaN value");
+#endif
+}
+
+#define RETURN_IF_FAIL(code)           \
+  do {                                 \
+    if (!code) return #code " failed"; \
+  } while (0)
+
+extern "C" void install_rust_hooks();
+
+JS_PUBLIC_API const char* JS::detail::InitWithFailureDiagnostic(
+    bool isDebugBuild, FrontendOnly frontendOnly /* = FrontendOnly::No */) {
+  // Verify that our DEBUG setting matches the caller's.
+#ifdef DEBUG
+  MOZ_RELEASE_ASSERT(isDebugBuild);
+#else
+  MOZ_RELEASE_ASSERT(!isDebugBuild);
+#endif
+
+  MOZ_ASSERT(libraryInitState == InitState::Uninitialized,
+             "must call JS_Init once before any JSAPI operation except "
+             "JS_SetICUMemoryFunctions");
+  MOZ_ASSERT(!JSRuntime::hasLiveRuntimes(),
+             "how do we have live runtimes before JS_Init?");
+
+  libraryInitState = InitState::Initializing;
+
+#ifdef JS_STANDALONE
+  // The rust hooks are initialized by Gecko on non-standalone builds.
+  install_rust_hooks();
+#endif
+
+  PRMJ_NowInit();
+
+  if (frontendOnly == FrontendOnly::No) {
+    // The first invocation of `ProcessCreation` creates a temporary thread
+    // and crashes if that fails, i.e. because we're out of memory. To prevent
+    // that from happening at some later time, get it out of the way during
+    // startup.
+    mozilla::TimeStamp::ProcessCreation();
+  }
+
+#ifdef DEBUG
+  CheckMessageParameterCounts();
+#endif
+
+  SetupCanonicalNaN();
+
+  if (frontendOnly == FrontendOnly::No) {
+    RETURN_IF_FAIL(js::TlsContext.init());
+  }
+
+#if defined(DEBUG) || defined(JS_OOM_BREAKPOINT)
+  RETURN_IF_FAIL(js::oom::InitThreadType());
+#endif
+
+#if defined(FUZZING)
+  js::oom::InitLargeAllocLimit();
+#endif
+
+#if defined(JS_GC_ALLOW_EXTRA_POISONING)
+  if (getenv("JSGC_EXTRA_POISONING")) {
+    js::gExtraPoisoningEnabled = true;
+  }
+#endif
+
+  js::InitMallocAllocator();
+
+  RETURN_IF_FAIL(js::Mutex::Init());
+
+  js::gc::InitMemorySubsystem();  // Ensure gc::SystemPageSize() works.
+
+  RETURN_IF_FAIL(js::wasm::Init());
+
+  js::coverage::InitLCov();
+
+  if (frontendOnly == FrontendOnly::No) {
+    RETURN_IF_FAIL(js::jit::InitializeJit());
+  }
+
+  RETURN_IF_FAIL(js::InitDateTimeState());
+
+  if (frontendOnly == FrontendOnly::No) {
+#ifdef MOZ_VTUNE
+    RETURN_IF_FAIL(js::vtune::Initialize());
+#endif
+  }
+
+#if JS_HAS_INTL_API
+  if (mozilla::intl::ICU4CLibrary::Initialize().isErr()) {
+    return "ICU4CLibrary::Initialize() failed";
+  }
+#endif  // JS_HAS_INTL_API
+
+  if (frontendOnly == FrontendOnly::No) {
+    RETURN_IF_FAIL(js::CreateHelperThreadsState());
+    RETURN_IF_FAIL(FutexThread::initialize());
+    RETURN_IF_FAIL(js::gcstats::Statistics::initialize());
+    RETURN_IF_FAIL(js::InitTestingFunctions());
+  }
+
+  RETURN_IF_FAIL(js::SharedImmutableStringsCache::initSingleton());
+  RETURN_IF_FAIL(js::frontend::WellKnownParserAtoms::initSingleton());
+
+  if (frontendOnly == FrontendOnly::No) {
+#ifdef JS_SIMULATOR
+    RETURN_IF_FAIL(js::jit::SimulatorProcess::initialize());
+#endif
+
+#ifndef JS_CODEGEN_NONE
+    // This is forced by InitializeJit.
+    MOZ_ASSERT(js::jit::CPUFlagsHaveBeenComputed());
+#endif
+  }
+
+  libraryInitState = InitState::Running;
+  return nullptr;
+}
+
+#undef RETURN_IF_FAIL
+
+JS_PUBLIC_API bool JS::InitSelfHostedCode(JSContext* cx, SelfHostedCache cache,
+                                          SelfHostedWriter writer) {
+  MOZ_RELEASE_ASSERT(!cx->runtime()->hasInitializedSelfHosting(),
+                     "JS::InitSelfHostedCode() called more than once");
+
+  js::AutoNoteSingleThreadedRegion anstr;
+
+  JSRuntime* rt = cx->runtime();
+
+  if (!rt->initSelfHostingStencil(cx, cache, writer)) {
+    return false;
+  }
+
+  if (!rt->initializeAtoms(cx)) {
+    return false;
+  }
+
+  if (!rt->initSelfHostingFromStencil(cx)) {
+    return false;
+  }
+
+  if (js::jit::HasJitBackend()) {
+    if (!rt->createJitRuntime(cx)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+static void ShutdownImpl(JS::detail::FrontendOnly frontendOnly) {
+  using FrontendOnly = JS::detail::FrontendOnly;
+
+  MOZ_ASSERT(
+      libraryInitState == InitState::Running,
+      "JS_ShutDown must only be called after JS_Init and can't race with it");
+#ifdef DEBUG
+  if (JSRuntime::hasLiveRuntimes()) {
+    // Gecko is too buggy to assert this just yet.
+    fprintf(stderr,
+            "WARNING: YOU ARE LEAKING THE WORLD (at least one JSRuntime "
+            "and everything alive inside it, that is) AT JS_ShutDown "
+            "TIME.  FIX THIS!\n");
+  }
+#endif
+
+  js::frontend::WellKnownParserAtoms::freeSingleton();
+  js::SharedImmutableStringsCache::freeSingleton();
+
+  if (frontendOnly == FrontendOnly::No) {
+    FutexThread::destroy();
+
+    js::DestroyHelperThreadsState();
+
+#ifdef JS_SIMULATOR
+    js::jit::SimulatorProcess::destroy();
+#endif
+  }
+
+  js::wasm::ShutDown();
+
+  // The only difficult-to-address reason for the restriction that you can't
+  // call JS_Init/stuff/JS_ShutDown multiple times is the Windows PRMJ
+  // NowInit initialization code, which uses PR_CallOnce to initialize the
+  // PRMJ_Now subsystem.  (For reinitialization to be permitted, we'd need to
+  // "reset" the called-once status -- doable, but more trouble than it's
+  // worth now.)  Initializing that subsystem from JS_Init eliminates the
+  // problem, but initialization can take a comparatively long time (15ms or
+  // so), so we really don't want to do it in JS_Init, and we really do want
+  // to do it only when PRMJ_Now is eventually called.
+  PRMJ_NowShutdown();
+
+#if JS_HAS_INTL_API
+  mozilla::intl::ICU4CLibrary::Cleanup();
+#endif  // JS_HAS_INTL_API
+
+  if (frontendOnly == FrontendOnly::No) {
+#ifdef MOZ_VTUNE
+    js::vtune::Shutdown();
+#endif  // MOZ_VTUNE
+  }
+
+  js::FinishDateTimeState();
+
+  if (frontendOnly == FrontendOnly::No) {
+    js::jit::ShutdownJit();
+  }
+
+  MOZ_ASSERT_IF(!JSRuntime::hasLiveRuntimes(), !js::WasmReservedBytes());
+
+  js::ShutDownMallocAllocator();
+
+  libraryInitState = InitState::ShutDown;
+}
+
+JS_PUBLIC_API void JS_ShutDown(void) {
+  ShutdownImpl(JS::detail::FrontendOnly::No);
+}
+
+JS_PUBLIC_API void JS_FrontendOnlyShutDown(void) {
+  ShutdownImpl(JS::detail::FrontendOnly::Yes);
+}
+
+JS_PUBLIC_API bool JS_SetICUMemoryFunctions(JS_ICUAllocFn allocFn,
+                                            JS_ICUReallocFn reallocFn,
+                                            JS_ICUFreeFn freeFn) {
+  MOZ_ASSERT(libraryInitState == InitState::Uninitialized,
+             "must call JS_SetICUMemoryFunctions before any other JSAPI "
+             "operation (including JS_Init)");
+
+#if JS_HAS_INTL_API
+  return mozilla::intl::ICU4CLibrary::SetMemoryFunctions(
+             {allocFn, reallocFn, freeFn})
+      .isOk();
+#else
+  return true;
+#endif
+}
+
+#if defined(ENABLE_WASM_SIMD) && \
+    (defined(JS_CODEGEN_X64) || defined(JS_CODEGEN_X86))
+void JS::SetAVXEnabled(bool enabled) {
+  if (enabled) {
+    js::jit::CPUInfo::SetAVXEnabled();
+  } else {
+    js::jit::CPUInfo::SetAVXDisabled();
+  }
+}
+#endif
+
+JS_PUBLIC_API void JS::DisableJitBackend() {
+  MOZ_ASSERT(libraryInitState == InitState::Uninitialized,
+             "DisableJitBackend must be called before JS_Init");
+  MOZ_ASSERT(!JSRuntime::hasLiveRuntimes(),
+             "DisableJitBackend must be called before creating a JSContext");
+  js::jit::JitOptions.disableJitBackend = true;
+}