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
14 namespace v8 {
15 namespace internal {
16
ReserveSpaceForLinkedInSnapshot(Deserializer * deserializer)17 void 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
Initialize(Isolate * isolate)29 bool 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
HaveASnapshotToStartFrom()49 bool Snapshot::HaveASnapshotToStartFrom() {
50 return size_ != 0;
51 }
52
53
NewContextFromSnapshot(Isolate * isolate)54 Handle<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.
SetNativesFromFile(StartupData * data)82 void SetNativesFromFile(StartupData* data) { CHECK(false); }
SetSnapshotFromFile(StartupData * data)83 void SetSnapshotFromFile(StartupData* data) { CHECK(false); }
84 #endif // V8_USE_EXTERNAL_STARTUP_DATA
85
86 } } // namespace v8::internal
87