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// The common functionality when building with or without snapshots.
6
7#include "src/v8.h"
8
9#include "src/api.h"
10#include "src/base/platform/platform.h"
11#include "src/serialize.h"
12#include "src/snapshot.h"
13
14namespace v8 {
15namespace internal {
16
17void Snapshot::ReserveSpaceForLinkedInSnapshot(Deserializer* deserializer) {
18  deserializer->set_reservation(NEW_SPACE, new_space_used_);
19  deserializer->set_reservation(OLD_POINTER_SPACE, pointer_space_used_);
20  deserializer->set_reservation(OLD_DATA_SPACE, data_space_used_);
21  deserializer->set_reservation(CODE_SPACE, code_space_used_);
22  deserializer->set_reservation(MAP_SPACE, map_space_used_);
23  deserializer->set_reservation(CELL_SPACE, cell_space_used_);
24  deserializer->set_reservation(PROPERTY_CELL_SPACE,
25                                property_cell_space_used_);
26}
27
28
29bool Snapshot::Initialize(Isolate* isolate) {
30  if (size_ > 0) {
31    base::ElapsedTimer timer;
32    if (FLAG_profile_deserialization) {
33      timer.Start();
34    }
35    SnapshotByteSource source(raw_data_, raw_size_);
36    Deserializer deserializer(&source);
37    ReserveSpaceForLinkedInSnapshot(&deserializer);
38    bool success = isolate->Init(&deserializer);
39    if (FLAG_profile_deserialization) {
40      double ms = timer.Elapsed().InMillisecondsF();
41      PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms);
42    }
43    return success;
44  }
45  return false;
46}
47
48
49bool Snapshot::HaveASnapshotToStartFrom() {
50  return size_ != 0;
51}
52
53
54Handle<Context> Snapshot::NewContextFromSnapshot(Isolate* isolate) {
55  if (context_size_ == 0) {
56    return Handle<Context>();
57  }
58  SnapshotByteSource source(context_raw_data_,
59                            context_raw_size_);
60  Deserializer deserializer(&source);
61  Object* root;
62  deserializer.set_reservation(NEW_SPACE, context_new_space_used_);
63  deserializer.set_reservation(OLD_POINTER_SPACE, context_pointer_space_used_);
64  deserializer.set_reservation(OLD_DATA_SPACE, context_data_space_used_);
65  deserializer.set_reservation(CODE_SPACE, context_code_space_used_);
66  deserializer.set_reservation(MAP_SPACE, context_map_space_used_);
67  deserializer.set_reservation(CELL_SPACE, context_cell_space_used_);
68  deserializer.set_reservation(PROPERTY_CELL_SPACE,
69                               context_property_cell_space_used_);
70  deserializer.DeserializePartial(isolate, &root);
71  CHECK(root->IsContext());
72  return Handle<Context>(Context::cast(root));
73}
74
75
76#ifdef V8_USE_EXTERNAL_STARTUP_DATA
77// Dummy implementations of Set*FromFile(..) APIs.
78//
79// These are meant for use with snapshot-external.cc. Should this file
80// be compiled with those options we just supply these dummy implementations
81// below. This happens when compiling the mksnapshot utility.
82void SetNativesFromFile(StartupData* data) { CHECK(false); }
83void SetSnapshotFromFile(StartupData* data) { CHECK(false); }
84#endif  // V8_USE_EXTERNAL_STARTUP_DATA
85
86} }  // namespace v8::internal
87