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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/init/v8.h"
#include <fstream>
#include "src/api/api.h"
#include "src/base/atomicops.h"
#include "src/base/once.h"
#include "src/base/platform/platform.h"
#include "src/codegen/cpu-features.h"
#include "src/codegen/interface-descriptors.h"
#include "src/debug/debug.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/execution/frames.h"
#include "src/execution/isolate.h"
#include "src/execution/runtime-profiler.h"
#include "src/execution/simulator.h"
#include "src/init/bootstrapper.h"
#include "src/libsampler/sampler.h"
#include "src/objects/elements.h"
#include "src/objects/objects-inl.h"
#include "src/profiler/heap-profiler.h"
#include "src/snapshot/natives.h"
#include "src/snapshot/snapshot.h"
#include "src/tracing/tracing-category-observer.h"
#include "src/wasm/wasm-engine.h"
namespace v8 {
namespace internal {
V8_DECLARE_ONCE(init_once);
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
V8_DECLARE_ONCE(init_natives_once);
V8_DECLARE_ONCE(init_snapshot_once);
#endif
v8::Platform* V8::platform_ = nullptr;
bool V8::Initialize() {
InitializeOncePerProcess();
return true;
}
void V8::TearDown() {
wasm::WasmEngine::GlobalTearDown();
#if defined(USE_SIMULATOR)
Simulator::GlobalTearDown();
#endif
CallDescriptors::TearDown();
ElementsAccessor::TearDown();
RegisteredExtension::UnregisterAll();
FlagList::ResetAllFlags(); // Frees memory held by string arguments.
}
void V8::InitializeOncePerProcessImpl() {
FlagList::EnforceFlagImplications();
if (FLAG_predictable && FLAG_random_seed == 0) {
// Avoid random seeds in predictable mode.
FLAG_random_seed = 12347;
}
if (FLAG_stress_compaction) {
FLAG_force_marking_deque_overflows = true;
FLAG_gc_global = true;
FLAG_max_semi_space_size = 1;
}
if (FLAG_trace_turbo) {
// Create an empty file shared by the process (e.g. the wasm engine).
std::ofstream(Isolate::GetTurboCfgFileName(nullptr).c_str(),
std::ios_base::trunc);
}
// Do not expose wasm in jitless mode.
//
// Even in interpreter-only mode, wasm currently still creates executable
// memory at runtime. Unexpose wasm until this changes.
// The correctness fuzzers are a special case: many of their test cases are
// built by fetching a random property from the the global object, and thus
// the global object layout must not change between configs. That is why we
// continue exposing wasm on correctness fuzzers even in jitless mode.
// TODO(jgruber): Remove this once / if wasm can run without executable
// memory.
if (FLAG_jitless && !FLAG_correctness_fuzzer_suppressions) {
FLAG_expose_wasm = false;
}
// The --jitless and --interpreted-frames-native-stack flags are incompatible
// since the latter requires code generation while the former prohibits code
// generation.
CHECK_WITH_MSG(!FLAG_interpreted_frames_native_stack || !FLAG_jitless,
"The --jitless and --interpreted-frames-native-stack flags "
"are incompatible.");
base::OS::Initialize(FLAG_hard_abort, FLAG_gc_fake_mmap);
if (FLAG_random_seed) SetRandomMmapSeed(FLAG_random_seed);
Isolate::InitializeOncePerProcess();
#if defined(USE_SIMULATOR)
Simulator::InitializeOncePerProcess();
#endif
CpuFeatures::Probe(false);
ElementsAccessor::InitializeOncePerProcess();
Bootstrapper::InitializeOncePerProcess();
CallDescriptors::InitializeOncePerProcess();
wasm::WasmEngine::InitializeOncePerProcess();
}
void V8::InitializeOncePerProcess() {
base::CallOnce(&init_once, &InitializeOncePerProcessImpl);
}
void V8::InitializePlatform(v8::Platform* platform) {
CHECK(!platform_);
CHECK(platform);
platform_ = platform;
v8::base::SetPrintStackTrace(platform_->GetStackTracePrinter());
v8::tracing::TracingCategoryObserver::SetUp();
}
void V8::ShutdownPlatform() {
CHECK(platform_);
v8::tracing::TracingCategoryObserver::TearDown();
v8::base::SetPrintStackTrace(nullptr);
platform_ = nullptr;
}
v8::Platform* V8::GetCurrentPlatform() {
v8::Platform* platform = reinterpret_cast<v8::Platform*>(
base::Relaxed_Load(reinterpret_cast<base::AtomicWord*>(&platform_)));
DCHECK(platform);
return platform;
}
void V8::SetPlatformForTesting(v8::Platform* platform) {
base::Relaxed_Store(reinterpret_cast<base::AtomicWord*>(&platform_),
reinterpret_cast<base::AtomicWord>(platform));
}
void V8::SetNativesBlob(StartupData* natives_blob) {
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
base::CallOnce(&init_natives_once, &SetNativesFromFile, natives_blob);
#else
UNREACHABLE();
#endif
}
void V8::SetSnapshotBlob(StartupData* snapshot_blob) {
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
base::CallOnce(&init_snapshot_once, &SetSnapshotFromFile, snapshot_blob);
#else
UNREACHABLE();
#endif
}
} // namespace internal
// static
double Platform::SystemClockTimeMillis() {
return base::OS::TimeCurrentMillis();
}
} // namespace v8