deps/v8/src/snapshot-external.cc

   1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Used for building with external snapshots.
   6
   7 #include "src/snapshot.h"
   8
   9 #include "src/base/platform/mutex.h"
  10 #include "src/serialize.h"
  11 #include "src/snapshot-source-sink.h"
  12 #include "src/v8.h"  // for V8::Initialize
  13
  14
  15 #ifndef V8_USE_EXTERNAL_STARTUP_DATA
  16 #error snapshot-external.cc is used only for the external snapshot build.
  17 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
  18
  19
  20 namespace v8 {
  21 namespace internal {
  22
  23 static base::LazyMutex external_startup_data_mutex = LAZY_MUTEX_INITIALIZER;
  24 static v8::StartupData external_startup_blob = {NULL, 0};
  25
  26 void SetSnapshotFromFile(StartupData* snapshot_blob) {
  27   base::LockGuard<base::Mutex> lock_guard(
  28       external_startup_data_mutex.Pointer());
  29   DCHECK(snapshot_blob);
  30   DCHECK(snapshot_blob->data);
  31   DCHECK(snapshot_blob->raw_size > 0);
  32   DCHECK(!external_startup_blob.data);
  33   DCHECK(Snapshot::SnapshotIsValid(snapshot_blob));
  34   external_startup_blob = *snapshot_blob;
  35 }
  36
  37
  38 const v8::StartupData Snapshot::SnapshotBlob() {
  39   base::LockGuard<base::Mutex> lock_guard(
  40       external_startup_data_mutex.Pointer());
  41   return external_startup_blob;
  42 }
  43 } }  // namespace v8::internal