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/snapshot.h"
8 
9 #include "src/base/platform/mutex.h"
10 #include "src/snapshot/serialize.h"
11 #include "src/snapshot/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 
SetSnapshotFromFile(StartupData * snapshot_blob)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 
DefaultSnapshotBlob()38 const v8::StartupData* Snapshot::DefaultSnapshotBlob() {
39   base::LockGuard<base::Mutex> lock_guard(
40       external_startup_data_mutex.Pointer());
41   return &external_startup_blob;
42 }
43 }  // namespace internal
44 }  // namespace v8
45