e3e0f1173f
Make values which are referenced via ExternalReference constexpr, and initialize them statically. This avoids dynamic initialization and protects them against being overwritten from generated code. R=neis@chromium.org Bug: v8:7570 Change-Id: I1c6c10fbffea12dc1f5bf726313bf8388e6530a1 Reviewed-on: https://chromium-review.googlesource.com/1013518 Reviewed-by: Georg Neis <neis@chromium.org> Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Cr-Commit-Position: refs/heads/master@{#52633}
145 lines
3.5 KiB
C++
145 lines
3.5 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/v8.h"
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#include "src/api.h"
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#include "src/assembler.h"
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#include "src/base/atomicops.h"
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#include "src/base/once.h"
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#include "src/base/platform/platform.h"
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#include "src/bootstrapper.h"
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#include "src/debug/debug.h"
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#include "src/deoptimizer.h"
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#include "src/elements.h"
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#include "src/frames.h"
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#include "src/isolate.h"
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#include "src/libsampler/sampler.h"
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#include "src/objects-inl.h"
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#include "src/profiler/heap-profiler.h"
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#include "src/runtime-profiler.h"
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#include "src/simulator.h"
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#include "src/snapshot/natives.h"
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#include "src/snapshot/snapshot.h"
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#include "src/tracing/tracing-category-observer.h"
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namespace v8 {
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namespace internal {
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V8_DECLARE_ONCE(init_once);
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#ifdef V8_USE_EXTERNAL_STARTUP_DATA
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V8_DECLARE_ONCE(init_natives_once);
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V8_DECLARE_ONCE(init_snapshot_once);
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#endif
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v8::Platform* V8::platform_ = nullptr;
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bool V8::Initialize() {
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InitializeOncePerProcess();
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return true;
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}
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void V8::TearDown() {
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#if defined(USE_SIMULATOR)
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Simulator::GlobalTearDown();
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#endif
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Bootstrapper::TearDownExtensions();
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ElementsAccessor::TearDown();
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RegisteredExtension::UnregisterAll();
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Isolate::GlobalTearDown();
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sampler::Sampler::TearDown();
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FlagList::ResetAllFlags(); // Frees memory held by string arguments.
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}
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void V8::InitializeOncePerProcessImpl() {
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FlagList::EnforceFlagImplications();
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if (FLAG_predictable && FLAG_random_seed == 0) {
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// Avoid random seeds in predictable mode.
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FLAG_random_seed = 12347;
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}
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if (FLAG_stress_compaction) {
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FLAG_force_marking_deque_overflows = true;
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FLAG_gc_global = true;
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FLAG_max_semi_space_size = 1;
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}
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base::OS::Initialize(FLAG_hard_abort, FLAG_gc_fake_mmap);
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if (FLAG_random_seed) SetRandomMmapSeed(FLAG_random_seed);
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Isolate::InitializeOncePerProcess();
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#if defined(USE_SIMULATOR)
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Simulator::InitializeOncePerProcess();
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#endif
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sampler::Sampler::SetUp();
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CpuFeatures::Probe(false);
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ElementsAccessor::InitializeOncePerProcess();
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Bootstrapper::InitializeOncePerProcess();
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}
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void V8::InitializeOncePerProcess() {
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base::CallOnce(&init_once, &InitializeOncePerProcessImpl);
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}
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void V8::InitializePlatform(v8::Platform* platform) {
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CHECK(!platform_);
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CHECK(platform);
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platform_ = platform;
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v8::base::SetPrintStackTrace(platform_->GetStackTracePrinter());
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v8::tracing::TracingCategoryObserver::SetUp();
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}
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void V8::ShutdownPlatform() {
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CHECK(platform_);
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v8::tracing::TracingCategoryObserver::TearDown();
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v8::base::SetPrintStackTrace(nullptr);
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platform_ = nullptr;
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}
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v8::Platform* V8::GetCurrentPlatform() {
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v8::Platform* platform = reinterpret_cast<v8::Platform*>(
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base::Relaxed_Load(reinterpret_cast<base::AtomicWord*>(&platform_)));
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DCHECK(platform);
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return platform;
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}
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void V8::SetPlatformForTesting(v8::Platform* platform) {
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base::Relaxed_Store(reinterpret_cast<base::AtomicWord*>(&platform_),
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reinterpret_cast<base::AtomicWord>(platform));
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}
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void V8::SetNativesBlob(StartupData* natives_blob) {
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#ifdef V8_USE_EXTERNAL_STARTUP_DATA
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base::CallOnce(&init_natives_once, &SetNativesFromFile, natives_blob);
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#else
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UNREACHABLE();
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#endif
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}
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void V8::SetSnapshotBlob(StartupData* snapshot_blob) {
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#ifdef V8_USE_EXTERNAL_STARTUP_DATA
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base::CallOnce(&init_snapshot_once, &SetSnapshotFromFile, snapshot_blob);
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#else
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UNREACHABLE();
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#endif
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}
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} // namespace internal
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// static
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double Platform::SystemClockTimeMillis() {
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return base::OS::TimeCurrentMillis();
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}
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} // namespace v8
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