| // 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 <stddef.h> |
| #include <stdint.h> |
| |
| #include "base/debug/alias.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/memory/scoped_ptr.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_ANDROID) |
| #include "base/android/apk_assets.h" |
| #endif |
| #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 { |
| |
| // None of these globals are ever freed nor closed. |
| base::MemoryMappedFile* g_mapped_natives = nullptr; |
| base::MemoryMappedFile* g_mapped_snapshot = nullptr; |
| |
| #if defined(V8_USE_EXTERNAL_STARTUP_DATA) |
| |
| const base::PlatformFile kInvalidPlatformFile = |
| #if defined(OS_WIN) |
| INVALID_HANDLE_VALUE; |
| #else |
| -1; |
| #endif |
| |
| // File handles intentionally never closed. Not using File here because its |
| // Windows implementation guards against two instances owning the same |
| // PlatformFile (which we allow since we know it is never freed). |
| base::PlatformFile g_natives_pf = kInvalidPlatformFile; |
| base::PlatformFile g_snapshot_pf = kInvalidPlatformFile; |
| base::MemoryMappedFile::Region g_natives_region; |
| base::MemoryMappedFile::Region g_snapshot_region; |
| |
| #if defined(OS_ANDROID) |
| #ifdef __LP64__ |
| const char kNativesFileName[] = "natives_blob_64.bin"; |
| const char kSnapshotFileName[] = "snapshot_blob_64.bin"; |
| #else |
| const char kNativesFileName[] = "natives_blob_32.bin"; |
| const char kSnapshotFileName[] = "snapshot_blob_32.bin"; |
| #endif // __LP64__ |
| |
| #else // defined(OS_ANDROID) |
| const char kNativesFileName[] = "natives_blob.bin"; |
| const char kSnapshotFileName[] = "snapshot_blob.bin"; |
| #endif // defined(OS_ANDROID) |
| |
| void GetV8FilePath(const char* file_name, base::FilePath* path_out) { |
| #if !defined(OS_MACOSX) |
| base::FilePath data_path; |
| #if defined(OS_ANDROID) |
| // This is the path within the .apk. |
| data_path = base::FilePath(FILE_PATH_LITERAL("assets")); |
| #elif defined(OS_POSIX) |
| PathService::Get(base::DIR_EXE, &data_path); |
| #elif defined(OS_WIN) |
| PathService::Get(base::DIR_MODULE, &data_path); |
| #endif |
| 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::PlatformFile platform_file, |
| base::MemoryMappedFile::Region region, |
| base::MemoryMappedFile** mmapped_file_out) { |
| DCHECK(*mmapped_file_out == NULL); |
| scoped_ptr<base::MemoryMappedFile> mmapped_file(new base::MemoryMappedFile()); |
| if (mmapped_file->Initialize(base::File(platform_file), region)) { |
| *mmapped_file_out = mmapped_file.release(); |
| return true; |
| } |
| return false; |
| } |
| |
| base::PlatformFile OpenV8File(const char* file_name, |
| base::MemoryMappedFile::Region* region_out) { |
| // 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 |
| }; |
| base::FilePath path; |
| GetV8FilePath(file_name, &path); |
| |
| #if defined(OS_ANDROID) |
| base::File file(base::android::OpenApkAsset(path.value(), region_out)); |
| OpenV8FileResult result = file.IsValid() ? OpenV8FileResult::OPENED |
| : OpenV8FileResult::FAILED_OTHER; |
| #else |
| // Re-try logic here is motivated by http://crbug.com/479537 |
| // for A/V on Windows (https://support.microsoft.com/en-us/kb/316609). |
| const int kMaxOpenAttempts = 5; |
| const int kOpenRetryDelayMillis = 250; |
| |
| OpenV8FileResult result = OpenV8FileResult::FAILED_IN_USE; |
| int flags = base::File::FLAG_OPEN | base::File::FLAG_READ; |
| base::File file; |
| for (int attempt = 0; attempt < kMaxOpenAttempts; attempt++) { |
| file.Initialize(path, flags); |
| if (file.IsValid()) { |
| *region_out = base::MemoryMappedFile::Region::kWholeFile; |
| 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; |
| #ifdef OS_WIN |
| // TODO(oth): temporary diagnostics for http://crbug.com/479537 |
| std::string narrow(kNativesFileName); |
| base::FilePath::StringType nativesBlob(narrow.begin(), narrow.end()); |
| if (path.BaseName().value() == nativesBlob) { |
| base::File::Error file_error = file.error_details(); |
| base::debug::Alias(&file_error); |
| LOG(FATAL) << "Failed to open V8 file '" << path.value() |
| << "' (reason: " << file.error_details() << ")"; |
| } |
| #endif // OS_WIN |
| break; |
| } else if (kMaxOpenAttempts - 1 != attempt) { |
| base::PlatformThread::Sleep( |
| base::TimeDelta::FromMilliseconds(kOpenRetryDelayMillis)); |
| } |
| } |
| #endif // defined(OS_ANDROID) |
| |
| UMA_HISTOGRAM_ENUMERATION("V8.Initializer.OpenV8File.Result", |
| result, |
| OpenV8FileResult::MAX_VALUE); |
| return file.TakePlatformFile(); |
| } |
| |
| void OpenNativesFileIfNecessary() { |
| if (g_natives_pf == kInvalidPlatformFile) { |
| g_natives_pf = OpenV8File(kNativesFileName, &g_natives_region); |
| } |
| } |
| |
| void OpenSnapshotFileIfNecessary() { |
| if (g_snapshot_pf == kInvalidPlatformFile) { |
| g_snapshot_pf = OpenV8File(kSnapshotFileName, &g_snapshot_region); |
| } |
| } |
| |
| #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; |
| } |
| |
| // TODO(oth): Remove this temporary diagnostics for http://crbug.com/501799 |
| uint64_t input[sizeof(output)]; |
| memcpy(input, fingerprint, sizeof(input)); |
| |
| base::debug::Alias(output); |
| base::debug::Alias(input); |
| |
| const uint64_t* o64 = reinterpret_cast<const uint64_t*>(output); |
| const uint64_t* f64 = reinterpret_cast<const uint64_t*>(fingerprint); |
| LOG(FATAL) << "Natives length " << (*file)->length() |
| << " H(computed) " << o64[0] << o64[1] << o64[2] << o64[3] |
| << " H(expected) " << f64[0] << f64[1] << f64[2] << f64[3]; |
| |
| 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 MapVerify(base::PlatformFile platform_file, |
| const base::MemoryMappedFile::Region& region, |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| const unsigned char* fingerprint, |
| #endif |
| base::MemoryMappedFile** mmapped_file_out) { |
| if (platform_file == kInvalidPlatformFile) |
| return V8_LOAD_FAILED_OPEN; |
| if (!MapV8File(platform_file, region, 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; |
| |
| OpenSnapshotFileIfNecessary(); |
| LoadV8FileResult result = MapVerify(g_snapshot_pf, g_snapshot_region, |
| #if defined(V8_VERIFY_EXTERNAL_STARTUP_DATA) |
| g_snapshot_fingerprint, |
| #endif |
| &g_mapped_snapshot); |
| // V8 can't start up without the source of the natives, but it can |
| // start up (slower) without the snapshot. |
| UMA_HISTOGRAM_ENUMERATION("V8.Initializer.LoadV8Snapshot.Result", result, |
| V8_LOAD_MAX_VALUE); |
| } |
| |
| void V8Initializer::LoadV8Natives() { |
| if (g_mapped_natives) |
| return; |
| |
| OpenNativesFileIfNecessary(); |
| LoadV8FileResult result = MapVerify(g_natives_pf, g_natives_region, |
| #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_t snapshot_offset, |
| int64_t snapshot_size) { |
| if (g_mapped_snapshot) |
| return; |
| |
| if (snapshot_pf == kInvalidPlatformFile) |
| return; |
| |
| base::MemoryMappedFile::Region snapshot_region = |
| base::MemoryMappedFile::Region::kWholeFile; |
| if (snapshot_size != 0 || snapshot_offset != 0) { |
| snapshot_region.offset = snapshot_offset; |
| snapshot_region.size = snapshot_size; |
| } |
| |
| LoadV8FileResult result = V8_LOAD_SUCCESS; |
| if (!MapV8File(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 |
| if (result == V8_LOAD_SUCCESS) { |
| g_snapshot_pf = snapshot_pf; |
| g_snapshot_region = snapshot_region; |
| } |
| UMA_HISTOGRAM_ENUMERATION("V8.Initializer.LoadV8Snapshot.Result", result, |
| V8_LOAD_MAX_VALUE); |
| } |
| |
| // static |
| void V8Initializer::LoadV8NativesFromFD(base::PlatformFile natives_pf, |
| int64_t natives_offset, |
| int64_t natives_size) { |
| if (g_mapped_natives) |
| return; |
| |
| CHECK_NE(natives_pf, kInvalidPlatformFile); |
| |
| base::MemoryMappedFile::Region natives_region = |
| base::MemoryMappedFile::Region::kWholeFile; |
| if (natives_size != 0 || natives_offset != 0) { |
| natives_region.offset = natives_offset; |
| natives_region.size = natives_size; |
| } |
| |
| if (!MapV8File(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 |
| g_natives_pf = natives_pf; |
| g_natives_region = natives_region; |
| } |
| |
| // static |
| base::PlatformFile V8Initializer::GetOpenNativesFileForChildProcesses( |
| base::MemoryMappedFile::Region* region_out) { |
| OpenNativesFileIfNecessary(); |
| *region_out = g_natives_region; |
| return g_natives_pf; |
| } |
| |
| // static |
| base::PlatformFile V8Initializer::GetOpenSnapshotFileForChildProcesses( |
| base::MemoryMappedFile::Region* region_out) { |
| OpenSnapshotFileIfNecessary(); |
| *region_out = g_snapshot_region; |
| return g_snapshot_pf; |
| } |
| #endif // defined(V8_USE_EXTERNAL_STARTUP_DATA) |
| |
| // static |
| void V8Initializer::Initialize(IsolateHolder::ScriptMode mode, |
| IsolateHolder::V8ExtrasMode v8_extras_mode) { |
| static bool v8_is_initialized = false; |
| if (v8_is_initialized) |
| return; |
| |
| v8::V8::InitializePlatform(V8Platform::Get()); |
| |
| if (IsolateHolder::kStrictMode == mode) { |
| static const char use_strict[] = "--use_strict"; |
| v8::V8::SetFlagsFromString(use_strict, sizeof(use_strict) - 1); |
| } |
| if (IsolateHolder::kStableAndExperimentalV8Extras == v8_extras_mode) { |
| static const char flag[] = "--experimental_extras"; |
| v8::V8::SetFlagsFromString(flag, sizeof(flag) - 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 |