| // 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/metrics/histogram.h" |
| #include "base/rand_util.h" |
| #include "base/strings/sys_string_conversions.h" |
| #include "base/threading/platform_thread.h" |
| #include "base/time/time.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 { |
| |
| base::MemoryMappedFile* g_mapped_natives = nullptr; |
| base::MemoryMappedFile* g_mapped_snapshot = nullptr; |
| |
| #if defined(V8_USE_EXTERNAL_STARTUP_DATA) |
| #if !defined(OS_MACOSX) |
| const int 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 kNativesFileName[] = "natives_blob.bin"; |
| const char kSnapshotFileName[] = "snapshot_blob.bin"; |
| |
| // Constants for snapshot loading retries taken from: |
| // https://support.microsoft.com/en-us/kb/316609. |
| const int kMaxOpenAttempts = 5; |
| const int kOpenRetryDelayMillis = 250; |
| |
| void GetV8FilePath(const char* file_name, base::FilePath* path_out) { |
| #if !defined(OS_MACOSX) |
| base::FilePath data_path; |
| PathService::Get(kV8SnapshotBasePathKey, &data_path); |
| DCHECK(!data_path.empty()); |
| |
| *path_out = data_path.AppendASCII(file_name); |
| #else // !defined(OS_MACOSX) |
| base::ScopedCFTypeRef<CFStringRef> natives_file_name( |
| base::SysUTF8ToCFStringRef(file_name)); |
| *path_out = base::mac::PathForFrameworkBundleResource(natives_file_name); |
| #endif // !defined(OS_MACOSX) |
| DCHECK(!path_out->empty()); |
| } |
| |
| static bool MapV8File(base::File file, |
| base::MemoryMappedFile::Region region, |
| base::MemoryMappedFile** mmapped_file_out) { |
| DCHECK(*mmapped_file_out == NULL); |
| base::MemoryMappedFile* mmapped_file = *mmapped_file_out = |
| new base::MemoryMappedFile; |
| if (!mmapped_file->Initialize(file.Pass(), region)) { |
| delete mmapped_file; |
| *mmapped_file_out = NULL; |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static bool OpenV8File(const base::FilePath& path, |
| int flags, |
| base::File& file) { |
| // Re-try logic here is motivated by http://crbug.com/479537 |
| // for A/V on Windows (https://support.microsoft.com/en-us/kb/316609). |
| |
| // These match tools/metrics/histograms.xml |
| enum OpenV8FileResult { |
| OPENED = 0, |
| OPENED_RETRY, |
| FAILED_IN_USE, |
| FAILED_OTHER, |
| MAX_VALUE |
| }; |
| |
| OpenV8FileResult result = OpenV8FileResult::FAILED_IN_USE; |
| for (int attempt = 0; attempt < kMaxOpenAttempts; attempt++) { |
| file.Initialize(path, flags); |
| if (file.IsValid()) { |
| if (attempt == 0) { |
| result = OpenV8FileResult::OPENED; |
| break; |
| } else { |
| result = OpenV8FileResult::OPENED_RETRY; |
| break; |
| } |
| } else if (file.error_details() != base::File::FILE_ERROR_IN_USE) { |
| result = OpenV8FileResult::FAILED_OTHER; |
| break; |
| } else if (kMaxOpenAttempts - 1 != attempt) { |
| base::PlatformThread::Sleep( |
| base::TimeDelta::FromMilliseconds(kOpenRetryDelayMillis)); |
| } |
| } |
| |
| UMA_HISTOGRAM_ENUMERATION("V8.Initializer.OpenV8File.Result", |
| result, |
| OpenV8FileResult::MAX_VALUE); |
| |
| return result == OpenV8FileResult::OPENED |
| || result == OpenV8FileResult::OPENED_RETRY; |
| } |
| |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| bool VerifyV8StartupFile(base::MemoryMappedFile** file, |
| const unsigned char* fingerprint) { |
| unsigned char output[crypto::kSHA256Length]; |
| crypto::SHA256HashString( |
| base::StringPiece(reinterpret_cast<const char*>((*file)->data()), |
| (*file)->length()), |
| output, sizeof(output)); |
| if (!memcmp(fingerprint, output, sizeof(output))) { |
| return true; |
| } |
| delete *file; |
| *file = NULL; |
| return false; |
| } |
| #endif // V8_VERIFY_EXTERNAL_STARTUP_DATA |
| #endif // V8_USE_EXTERNAL_STARTUP_DATA |
| |
| bool GenerateEntropy(unsigned char* buffer, size_t amount) { |
| base::RandBytes(buffer, amount); |
| return true; |
| } |
| |
| } // 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 |
| |
| enum LoadV8FileResult { |
| V8_LOAD_SUCCESS = 0, |
| V8_LOAD_FAILED_OPEN, |
| V8_LOAD_FAILED_MAP, |
| V8_LOAD_FAILED_VERIFY, |
| V8_LOAD_MAX_VALUE |
| }; |
| |
| static LoadV8FileResult OpenMapVerify( |
| const char* file_name, |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| const unsigned char* fingerprint, |
| #endif |
| base::MemoryMappedFile** mmapped_file_out) { |
| base::FilePath path; |
| GetV8FilePath(file_name, &path); |
| |
| base::File file; |
| int flags = base::File::FLAG_OPEN | base::File::FLAG_READ; |
| |
| if (!OpenV8File(path, flags, file)) |
| return V8_LOAD_FAILED_OPEN; |
| if (!MapV8File(file.Pass(), base::MemoryMappedFile::Region::kWholeFile, |
| mmapped_file_out)) |
| return V8_LOAD_FAILED_MAP; |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| if (!VerifyV8StartupFile(mmapped_file_out, fingerprint)) |
| return V8_LOAD_FAILED_VERIFY; |
| #endif // V8_VERIFY_EXTERNAL_STARTUP_DATA |
| return V8_LOAD_SUCCESS; |
| } |
| |
| // static |
| void V8Initializer::LoadV8Snapshot() { |
| if (g_mapped_snapshot) |
| return; |
| |
| LoadV8FileResult result = OpenMapVerify(kSnapshotFileName, |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| g_snapshot_fingerprint, |
| #endif |
| &g_mapped_snapshot); |
| UMA_HISTOGRAM_ENUMERATION("V8.Initializer.LoadV8Snapshot.Result", result, |
| V8_LOAD_MAX_VALUE); |
| } |
| |
| void V8Initializer::LoadV8Natives() { |
| if (g_mapped_natives) |
| return; |
| |
| LoadV8FileResult result = OpenMapVerify(kNativesFileName, |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| g_natives_fingerprint, |
| #endif |
| &g_mapped_natives); |
| if (result != V8_LOAD_SUCCESS) { |
| LOG(FATAL) << "Couldn't mmap v8 natives data file, status code is " |
| << static_cast<int>(result); |
| } |
| } |
| |
| // static |
| void V8Initializer::LoadV8SnapshotFromFD(base::PlatformFile snapshot_pf, |
| int64 snapshot_offset, |
| int64 snapshot_size) { |
| if (g_mapped_snapshot) |
| return; |
| |
| if (snapshot_pf == reinterpret_cast<base::PlatformFile>(-1)) |
| return; |
| |
| base::MemoryMappedFile::Region snapshot_region = |
| base::MemoryMappedFile::Region::kWholeFile; |
| if (snapshot_size != 0 || snapshot_offset != 0) { |
| snapshot_region = |
| base::MemoryMappedFile::Region(snapshot_offset, snapshot_size); |
| } |
| |
| LoadV8FileResult result = V8_LOAD_SUCCESS; |
| if (!MapV8File(base::File(snapshot_pf), snapshot_region, &g_mapped_snapshot)) |
| result = V8_LOAD_FAILED_MAP; |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| if (!VerifyV8StartupFile(&g_mapped_snapshot, g_snapshot_fingerprint)) |
| result = V8_LOAD_FAILED_VERIFY; |
| #endif // V8_VERIFY_EXTERNAL_STARTUP_DATA |
| UMA_HISTOGRAM_ENUMERATION("V8.Initializer.LoadV8Snapshot.Result", result, |
| V8_LOAD_MAX_VALUE); |
| } |
| |
| // static |
| void V8Initializer::LoadV8NativesFromFD(base::PlatformFile natives_pf, |
| int64 natives_offset, |
| int64 natives_size) { |
| if (g_mapped_natives) |
| return; |
| |
| CHECK_NE(natives_pf, reinterpret_cast<base::PlatformFile>(-1)); |
| |
| 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); |
| } |
| |
| if (!MapV8File(base::File(natives_pf), natives_region, &g_mapped_natives)) { |
| LOG(FATAL) << "Couldn't mmap v8 natives data file"; |
| } |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| if (!VerifyV8StartupFile(&g_mapped_natives, g_natives_fingerprint)) { |
| LOG(FATAL) << "Couldn't verify contents of v8 natives data file"; |
| } |
| #endif // V8_VERIFY_EXTERNAL_STARTUP_DATA |
| } |
| |
| // static |
| bool V8Initializer::OpenV8FilesForChildProcesses( |
| base::PlatformFile* natives_fd_out, |
| base::PlatformFile* snapshot_fd_out) { |
| base::FilePath natives_data_path; |
| base::FilePath snapshot_data_path; |
| GetV8FilePath(kNativesFileName, &natives_data_path); |
| GetV8FilePath(kSnapshotFileName, &snapshot_data_path); |
| |
| base::File natives_data_file; |
| base::File snapshot_data_file; |
| int file_flags = base::File::FLAG_OPEN | base::File::FLAG_READ; |
| |
| bool natives_success = |
| OpenV8File(natives_data_path, file_flags, natives_data_file); |
| if (natives_success) { |
| *natives_fd_out = natives_data_file.TakePlatformFile(); |
| } |
| bool snapshot_success = |
| OpenV8File(snapshot_data_path, file_flags, snapshot_data_file); |
| if (snapshot_success) { |
| *snapshot_fd_out = snapshot_data_file.TakePlatformFile(); |
| } |
| // We can start up without the snapshot file, but not without the natives. |
| return natives_success; |
| } |
| |
| #endif // V8_USE_EXTERNAL_STARTUP_DATA |
| |
| // static |
| void V8Initializer::Initialize(gin::IsolateHolder::ScriptMode mode) { |
| static bool v8_is_initialized = false; |
| if (v8_is_initialized) |
| return; |
| |
| v8::V8::InitializePlatform(V8Platform::Get()); |
| |
| 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); |
| |
| if (g_mapped_snapshot != NULL) { |
| 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) { |
| *natives_data_out = reinterpret_cast<const char*>(g_mapped_natives->data()); |
| *natives_size_out = static_cast<int>(g_mapped_natives->length()); |
| } else { |
| *natives_data_out = NULL; |
| *natives_size_out = 0; |
| } |
| if (g_mapped_snapshot) { |
| *snapshot_data_out = |
| reinterpret_cast<const char*>(g_mapped_snapshot->data()); |
| *snapshot_size_out = static_cast<int>(g_mapped_snapshot->length()); |
| } else { |
| *snapshot_data_out = NULL; |
| *snapshot_size_out = 0; |
| } |
| } |
| |
| } // namespace gin |