1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
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9 // copyright notice, this list of conditions and the following
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15 //
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26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 // The common functionality when building with or without snapshots.
29
30 #include "v8.h"
31
32 #include "api.h"
33 #include "serialize.h"
34 #include "snapshot.h"
35 #include "platform.h"
36
37 namespace v8 {
38 namespace internal {
39
40
ReserveSpaceForSnapshot(Deserializer * deserializer,const char * file_name)41 static void ReserveSpaceForSnapshot(Deserializer* deserializer,
42 const char* file_name) {
43 int file_name_length = StrLength(file_name) + 10;
44 Vector<char> name = Vector<char>::New(file_name_length + 1);
45 OS::SNPrintF(name, "%s.size", file_name);
46 FILE* fp = OS::FOpen(name.start(), "r");
47 CHECK_NE(NULL, fp);
48 int new_size, pointer_size, data_size, code_size, map_size, cell_size,
49 property_cell_size;
50 #ifdef _MSC_VER
51 // Avoid warning about unsafe fscanf from MSVC.
52 // Please note that this is only fine if %c and %s are not being used.
53 #define fscanf fscanf_s
54 #endif
55 CHECK_EQ(1, fscanf(fp, "new %d\n", &new_size));
56 CHECK_EQ(1, fscanf(fp, "pointer %d\n", &pointer_size));
57 CHECK_EQ(1, fscanf(fp, "data %d\n", &data_size));
58 CHECK_EQ(1, fscanf(fp, "code %d\n", &code_size));
59 CHECK_EQ(1, fscanf(fp, "map %d\n", &map_size));
60 CHECK_EQ(1, fscanf(fp, "cell %d\n", &cell_size));
61 CHECK_EQ(1, fscanf(fp, "property cell %d\n", &property_cell_size));
62 #ifdef _MSC_VER
63 #undef fscanf
64 #endif
65 fclose(fp);
66 deserializer->set_reservation(NEW_SPACE, new_size);
67 deserializer->set_reservation(OLD_POINTER_SPACE, pointer_size);
68 deserializer->set_reservation(OLD_DATA_SPACE, data_size);
69 deserializer->set_reservation(CODE_SPACE, code_size);
70 deserializer->set_reservation(MAP_SPACE, map_size);
71 deserializer->set_reservation(CELL_SPACE, cell_size);
72 deserializer->set_reservation(PROPERTY_CELL_SPACE,
73 property_cell_size);
74 name.Dispose();
75 }
76
77
ReserveSpaceForLinkedInSnapshot(Deserializer * deserializer)78 void Snapshot::ReserveSpaceForLinkedInSnapshot(Deserializer* deserializer) {
79 deserializer->set_reservation(NEW_SPACE, new_space_used_);
80 deserializer->set_reservation(OLD_POINTER_SPACE, pointer_space_used_);
81 deserializer->set_reservation(OLD_DATA_SPACE, data_space_used_);
82 deserializer->set_reservation(CODE_SPACE, code_space_used_);
83 deserializer->set_reservation(MAP_SPACE, map_space_used_);
84 deserializer->set_reservation(CELL_SPACE, cell_space_used_);
85 deserializer->set_reservation(PROPERTY_CELL_SPACE,
86 property_cell_space_used_);
87 }
88
89
Initialize(const char * snapshot_file)90 bool Snapshot::Initialize(const char* snapshot_file) {
91 if (snapshot_file) {
92 int len;
93 byte* str = ReadBytes(snapshot_file, &len);
94 if (!str) return false;
95 bool success;
96 {
97 SnapshotByteSource source(str, len);
98 Deserializer deserializer(&source);
99 ReserveSpaceForSnapshot(&deserializer, snapshot_file);
100 success = V8::Initialize(&deserializer);
101 }
102 DeleteArray(str);
103 return success;
104 } else if (size_ > 0) {
105 ElapsedTimer timer;
106 if (FLAG_profile_deserialization) {
107 timer.Start();
108 }
109 SnapshotByteSource source(raw_data_, raw_size_);
110 Deserializer deserializer(&source);
111 ReserveSpaceForLinkedInSnapshot(&deserializer);
112 bool success = V8::Initialize(&deserializer);
113 if (FLAG_profile_deserialization) {
114 double ms = timer.Elapsed().InMillisecondsF();
115 PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms);
116 }
117 return success;
118 }
119 return false;
120 }
121
122
HaveASnapshotToStartFrom()123 bool Snapshot::HaveASnapshotToStartFrom() {
124 return size_ != 0;
125 }
126
127
NewContextFromSnapshot(Isolate * isolate)128 Handle<Context> Snapshot::NewContextFromSnapshot(Isolate* isolate) {
129 if (context_size_ == 0) {
130 return Handle<Context>();
131 }
132 SnapshotByteSource source(context_raw_data_,
133 context_raw_size_);
134 Deserializer deserializer(&source);
135 Object* root;
136 deserializer.set_reservation(NEW_SPACE, context_new_space_used_);
137 deserializer.set_reservation(OLD_POINTER_SPACE, context_pointer_space_used_);
138 deserializer.set_reservation(OLD_DATA_SPACE, context_data_space_used_);
139 deserializer.set_reservation(CODE_SPACE, context_code_space_used_);
140 deserializer.set_reservation(MAP_SPACE, context_map_space_used_);
141 deserializer.set_reservation(CELL_SPACE, context_cell_space_used_);
142 deserializer.set_reservation(PROPERTY_CELL_SPACE,
143 context_property_cell_space_used_);
144 deserializer.DeserializePartial(isolate, &root);
145 CHECK(root->IsContext());
146 return Handle<Context>(Context::cast(root));
147 }
148
149 } } // namespace v8::internal
150