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// Copyright 2013 The Chromium 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 "gin/public/isolate_holder.h"
#include <stdlib.h>
#include <string.h>
#include "base/files/memory_mapped_file.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/rand_util.h"
#include "base/sys_info.h"
#include "gin/array_buffer.h"
#include "gin/debug_impl.h"
#include "gin/function_template.h"
#include "gin/per_isolate_data.h"
#include "gin/public/v8_platform.h"
#include "gin/run_microtasks_observer.h"
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
#ifdef OS_MACOSX
#include "base/mac/foundation_util.h"
#endif // OS_MACOSX
#include "base/path_service.h"
#endif // V8_USE_EXTERNAL_STARTUP_DATA
namespace gin {
namespace {
v8::ArrayBuffer::Allocator* g_array_buffer_allocator = NULL;
bool GenerateEntropy(unsigned char* buffer, size_t amount) {
base::RandBytes(buffer, amount);
return true;
}
base::MemoryMappedFile* g_mapped_natives = NULL;
base::MemoryMappedFile* g_mapped_snapshot = NULL;
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
bool MapV8Files(base::FilePath* natives_path, base::FilePath* snapshot_path,
int natives_fd = -1, int snapshot_fd = -1) {
int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
g_mapped_natives = new base::MemoryMappedFile;
if (!g_mapped_natives->IsValid()) {
if (natives_fd == -1
? !g_mapped_natives->Initialize(base::File(*natives_path, flags))
: !g_mapped_natives->Initialize(base::File(natives_fd))) {
delete g_mapped_natives;
g_mapped_natives = NULL;
LOG(FATAL) << "Couldn't mmap v8 natives data file";
return false;
}
}
g_mapped_snapshot = new base::MemoryMappedFile;
if (!g_mapped_snapshot->IsValid()) {
if (snapshot_fd == -1
? !g_mapped_snapshot->Initialize(base::File(*snapshot_path, flags))
: !g_mapped_snapshot->Initialize(base::File(snapshot_fd))) {
delete g_mapped_snapshot;
g_mapped_snapshot = NULL;
LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
return false;
}
}
return true;
}
#if !defined(OS_MACOSX)
const int v8_snapshot_dir =
#if defined(OS_ANDROID)
base::DIR_ANDROID_APP_DATA;
#elif defined(OS_POSIX)
base::DIR_EXE;
#endif // defined(OS_ANDROID)
#endif // !defined(OS_MACOSX)
#endif // V8_USE_EXTERNAL_STARTUP_DATA
} // namespace
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
// static
bool IsolateHolder::LoadV8Snapshot() {
if (g_mapped_natives && g_mapped_snapshot)
return true;
#if !defined(OS_MACOSX)
base::FilePath data_path;
PathService::Get(v8_snapshot_dir, &data_path);
DCHECK(!data_path.empty());
base::FilePath natives_path = data_path.AppendASCII("natives_blob.bin");
base::FilePath snapshot_path = data_path.AppendASCII("snapshot_blob.bin");
#else // !defined(OS_MACOSX)
base::FilePath natives_path = base::mac::PathForFrameworkBundleResource(
CFSTR("natives_blob.bin"));
base::FilePath snapshot_path = base::mac::PathForFrameworkBundleResource(
CFSTR("snapshot_blob.bin"));
DCHECK(!natives_path.empty());
DCHECK(!snapshot_path.empty());
#endif // !defined(OS_MACOSX)
return MapV8Files(&natives_path, &snapshot_path);
}
//static
bool IsolateHolder::LoadV8SnapshotFD(int natives_fd, int snapshot_fd) {
if (g_mapped_natives && g_mapped_snapshot)
return true;
return MapV8Files(NULL, NULL, natives_fd, snapshot_fd);
}
#endif // V8_USE_EXTERNAL_STARTUP_DATA
//static
void IsolateHolder::GetV8ExternalSnapshotData(const char** natives_data_out,
int* natives_size_out,
const char** snapshot_data_out,
int* snapshot_size_out) {
if (!g_mapped_natives || !g_mapped_snapshot) {
*natives_data_out = *snapshot_data_out = NULL;
*natives_size_out = *snapshot_size_out = 0;
return;
}
*natives_data_out = reinterpret_cast<const char*>(g_mapped_natives->data());
*snapshot_data_out = reinterpret_cast<const char*>(g_mapped_snapshot->data());
*natives_size_out = static_cast<int>(g_mapped_natives->length());
*snapshot_size_out = static_cast<int>(g_mapped_snapshot->length());
}
IsolateHolder::IsolateHolder() {
CHECK(g_array_buffer_allocator)
<< "You need to invoke gin::IsolateHolder::Initialize first";
v8::Isolate::CreateParams params;
params.entry_hook = DebugImpl::GetFunctionEntryHook();
params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
base::SysInfo::AmountOfVirtualMemory(),
base::SysInfo::NumberOfProcessors());
isolate_ = v8::Isolate::New(params);
isolate_data_.reset(new PerIsolateData(isolate_, g_array_buffer_allocator));
#if defined(OS_WIN)
{
void* code_range;
size_t size;
isolate_->GetCodeRange(&code_range, &size);
Debug::CodeRangeCreatedCallback callback =
DebugImpl::GetCodeRangeCreatedCallback();
if (code_range && size && callback)
callback(code_range, size);
}
#endif
}
IsolateHolder::~IsolateHolder() {
if (task_observer_.get())
base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
#if defined(OS_WIN)
{
void* code_range;
size_t size;
isolate_->GetCodeRange(&code_range, &size);
Debug::CodeRangeDeletedCallback callback =
DebugImpl::GetCodeRangeDeletedCallback();
if (code_range && callback)
callback(code_range);
}
#endif
isolate_data_.reset();
isolate_->Dispose();
}
// static
void IsolateHolder::Initialize(ScriptMode mode,
v8::ArrayBuffer::Allocator* allocator) {
CHECK(allocator);
static bool v8_is_initialized = false;
if (v8_is_initialized)
return;
v8::V8::InitializePlatform(V8Platform::Get());
v8::V8::SetArrayBufferAllocator(allocator);
g_array_buffer_allocator = allocator;
if (mode == gin::IsolateHolder::kStrictMode) {
static const char v8_flags[] = "--use_strict";
v8::V8::SetFlagsFromString(v8_flags, sizeof(v8_flags) - 1);
}
v8::V8::SetEntropySource(&GenerateEntropy);
#ifdef V8_USE_EXTERNAL_STARTUP_DATA
v8::StartupData natives;
natives.data = reinterpret_cast<const char*>(g_mapped_natives->data());
natives.raw_size = static_cast<int>(g_mapped_natives->length());
v8::V8::SetNativesDataBlob(&natives);
v8::StartupData snapshot;
snapshot.data = reinterpret_cast<const char*>(g_mapped_snapshot->data());
snapshot.raw_size = static_cast<int>(g_mapped_snapshot->length());
v8::V8::SetSnapshotDataBlob(&snapshot);
#endif // V8_USE_EXTERNAL_STARTUP_DATA
v8::V8::Initialize();
v8_is_initialized = true;
}
void IsolateHolder::AddRunMicrotasksObserver() {
DCHECK(!task_observer_.get());
task_observer_.reset(new RunMicrotasksObserver(isolate_));;
base::MessageLoop::current()->AddTaskObserver(task_observer_.get());
}
void IsolateHolder::RemoveRunMicrotasksObserver() {
DCHECK(task_observer_.get());
base::MessageLoop::current()->RemoveTaskObserver(task_observer_.get());
task_observer_.reset();
}
} // namespace gin
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