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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/v8_initializer.h"
#include "base/basictypes.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/memory_mapped_file.h"
#include "base/logging.h"
#include "base/rand_util.h"
#include "base/strings/sys_string_conversions.h"
#include "crypto/sha2.h"
#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
#if defined(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 {
bool GenerateEntropy(unsigned char* buffer, size_t amount) {
base::RandBytes(buffer, amount);
return true;
}
base::MemoryMappedFile* g_mapped_natives = nullptr;
base::MemoryMappedFile* g_mapped_snapshot = nullptr;
#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
bool MapV8Files(base::File natives_file,
base::File snapshot_file,
base::MemoryMappedFile::Region natives_region =
base::MemoryMappedFile::Region::kWholeFile,
base::MemoryMappedFile::Region snapshot_region =
base::MemoryMappedFile::Region::kWholeFile) {
g_mapped_natives = new base::MemoryMappedFile;
if (!g_mapped_natives->IsValid()) {
if (!g_mapped_natives->Initialize(natives_file.Pass(), natives_region)) {
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 (!g_mapped_snapshot->Initialize(snapshot_file.Pass(), snapshot_region)) {
delete g_mapped_snapshot;
g_mapped_snapshot = NULL;
LOG(ERROR) << "Couldn't mmap v8 snapshot data file";
return false;
}
}
return true;
}
#if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
bool VerifyV8SnapshotFile(base::MemoryMappedFile* snapshot_file,
const unsigned char* fingerprint) {
unsigned char output[crypto::kSHA256Length];
crypto::SHA256HashString(
base::StringPiece(reinterpret_cast<const char*>(snapshot_file->data()),
snapshot_file->length()),
output, sizeof(output));
return !memcmp(fingerprint, output, sizeof(output));
}
#endif // V8_VERIFY_EXTERNAL_STARTUP_DATA
#endif // V8_USE_EXTERNAL_STARTUP_DATA
} // namespace
#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
#if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
// Defined in gen/gin/v8_snapshot_fingerprint.cc
extern const unsigned char g_natives_fingerprint[];
extern const unsigned char g_snapshot_fingerprint[];
#endif // V8_VERIFY_EXTERNAL_STARTUP_DATA
#if !defined(OS_MACOSX)
const int V8Initializer::kV8SnapshotBasePathKey =
#if defined(OS_ANDROID)
base::DIR_ANDROID_APP_DATA;
#elif defined(OS_POSIX)
base::DIR_EXE;
#elif defined(OS_WIN)
base::DIR_MODULE;
#endif // OS_ANDROID
#endif // !OS_MACOSX
const char V8Initializer::kNativesFileName[] = "natives_blob.bin";
const char V8Initializer::kSnapshotFileName[] = "snapshot_blob.bin";
// static
bool V8Initializer::LoadV8Snapshot() {
if (g_mapped_natives && g_mapped_snapshot)
return true;
#if !defined(OS_MACOSX)
base::FilePath data_path;
PathService::Get(kV8SnapshotBasePathKey, &data_path);
DCHECK(!data_path.empty());
base::FilePath natives_path = data_path.AppendASCII(kNativesFileName);
base::FilePath snapshot_path = data_path.AppendASCII(kSnapshotFileName);
#else // !defined(OS_MACOSX)
base::ScopedCFTypeRef<CFStringRef> natives_file_name(
base::SysUTF8ToCFStringRef(kNativesFileName));
base::FilePath natives_path =
base::mac::PathForFrameworkBundleResource(natives_file_name);
base::ScopedCFTypeRef<CFStringRef> snapshot_file_name(
base::SysUTF8ToCFStringRef(kSnapshotFileName));
base::FilePath snapshot_path =
base::mac::PathForFrameworkBundleResource(snapshot_file_name);
DCHECK(!natives_path.empty());
DCHECK(!snapshot_path.empty());
#endif // !defined(OS_MACOSX)
int flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
if (!MapV8Files(base::File(natives_path, flags),
base::File(snapshot_path, flags)))
return false;
#if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA)
return VerifyV8SnapshotFile(g_mapped_natives, g_natives_fingerprint) &&
VerifyV8SnapshotFile(g_mapped_snapshot, g_snapshot_fingerprint);
#else
return true;
#endif // V8_VERIFY_EXTERNAL_STARTUP_DATA
}
// static
bool V8Initializer::LoadV8SnapshotFromFD(base::PlatformFile natives_pf,
int64 natives_offset,
int64 natives_size,
base::PlatformFile snapshot_pf,
int64 snapshot_offset,
int64 snapshot_size) {
if (g_mapped_natives && g_mapped_snapshot)
return true;
base::MemoryMappedFile::Region natives_region =
base::MemoryMappedFile::Region::kWholeFile;
if (natives_size != 0 || natives_offset != 0) {
natives_region =
base::MemoryMappedFile::Region(natives_offset, natives_size);
}
base::MemoryMappedFile::Region snapshot_region =
base::MemoryMappedFile::Region::kWholeFile;
if (natives_size != 0 || natives_offset != 0) {
snapshot_region =
base::MemoryMappedFile::Region(snapshot_offset, snapshot_size);
}
return MapV8Files(base::File(natives_pf), base::File(snapshot_pf),
natives_region, snapshot_region);
}
#endif // V8_USE_EXTERNAL_STARTUP_DATA
// static
void V8Initializer::Initialize(gin::IsolateHolder::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);
if (gin::IsolateHolder::kStrictMode == mode) {
static const char use_strict[] = "--use_strict";
v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1);
}
#if defined(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::SetEntropySource(&GenerateEntropy);
v8::V8::Initialize();
v8_is_initialized = true;
}
// static
void V8Initializer::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());
}
} // namespace gin
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