// Copyright 2006-2008 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. // Used for building with external snapshots. #include "src/base/platform/mutex.h" #include "src/flags/flags.h" #include "src/init/v8.h" // for V8::Initialize #include "src/snapshot/snapshot-source-sink.h" #include "src/snapshot/snapshot.h" #ifndef V8_USE_EXTERNAL_STARTUP_DATA #error snapshot-external.cc is used only for the external snapshot build. #endif // V8_USE_EXTERNAL_STARTUP_DATA namespace v8 { namespace internal { static base::LazyMutex external_startup_data_mutex = LAZY_MUTEX_INITIALIZER; static v8::StartupData external_startup_blob = {nullptr, 0}; #ifdef V8_TARGET_OS_ANDROID static bool external_startup_checksum_verified = false; #endif void SetSnapshotFromFile(StartupData* snapshot_blob) { base::MutexGuard lock_guard(external_startup_data_mutex.Pointer()); DCHECK(snapshot_blob); DCHECK(snapshot_blob->data); DCHECK_GT(snapshot_blob->raw_size, 0); DCHECK(!external_startup_blob.data); DCHECK(Snapshot::SnapshotIsValid(snapshot_blob)); external_startup_blob = *snapshot_blob; #ifdef V8_TARGET_OS_ANDROID external_startup_checksum_verified = false; #endif } bool Snapshot::ShouldVerifyChecksum(const v8::StartupData* data) { #ifdef V8_TARGET_OS_ANDROID base::MutexGuard lock_guard(external_startup_data_mutex.Pointer()); if (data != &external_startup_blob) { return v8_flags.verify_snapshot_checksum; } // Verify the external snapshot maximally once per process due to the // additional overhead. if (external_startup_checksum_verified) return false; external_startup_checksum_verified = true; return true; #else return v8_flags.verify_snapshot_checksum; #endif } const v8::StartupData* Snapshot::DefaultSnapshotBlob() { base::MutexGuard lock_guard(external_startup_data_mutex.Pointer()); return &external_startup_blob; } } // namespace internal } // namespace v8