1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include "src/v8.h"
#include "include/libplatform/libplatform.h"
#include "src/assembler.h"
#include "src/base/platform/platform.h"
#include "src/bootstrapper.h"
#include "src/flags.h"
#include "src/list.h"
#include "src/natives.h"
#include "src/serialize.h"
using namespace v8;
class SnapshotWriter {
public:
explicit SnapshotWriter(const char* snapshot_file)
: fp_(GetFileDescriptorOrDie(snapshot_file)),
startup_blob_file_(NULL) {}
~SnapshotWriter() {
fclose(fp_);
if (startup_blob_file_) fclose(startup_blob_file_);
}
void SetStartupBlobFile(const char* startup_blob_file) {
if (startup_blob_file != NULL)
startup_blob_file_ = GetFileDescriptorOrDie(startup_blob_file);
}
void WriteSnapshot(v8::StartupData blob) const {
i::Vector<const i::byte> blob_vector(
reinterpret_cast<const i::byte*>(blob.data), blob.raw_size);
WriteSnapshotFile(blob_vector);
MaybeWriteStartupBlob(blob_vector);
}
private:
void MaybeWriteStartupBlob(const i::Vector<const i::byte>& blob) const {
if (!startup_blob_file_) return;
size_t written = fwrite(blob.begin(), 1, blob.length(), startup_blob_file_);
if (written != static_cast<size_t>(blob.length())) {
i::PrintF("Writing snapshot file failed.. Aborting.\n");
exit(1);
}
}
void WriteSnapshotFile(const i::Vector<const i::byte>& blob) const {
WriteFilePrefix();
WriteData(blob);
WriteFileSuffix();
}
void WriteFilePrefix() const {
fprintf(fp_, "// Autogenerated snapshot file. Do not edit.\n\n");
fprintf(fp_, "#include \"src/v8.h\"\n");
fprintf(fp_, "#include \"src/base/platform/platform.h\"\n\n");
fprintf(fp_, "#include \"src/snapshot.h\"\n\n");
fprintf(fp_, "namespace v8 {\n");
fprintf(fp_, "namespace internal {\n\n");
}
void WriteFileSuffix() const {
fprintf(fp_, "const v8::StartupData Snapshot::SnapshotBlob() {\n");
fprintf(fp_, " v8::StartupData blob;\n");
fprintf(fp_, " blob.data = reinterpret_cast<const char*>(blob_data);\n");
fprintf(fp_, " blob.raw_size = blob_size;\n");
fprintf(fp_, " return blob;\n");
fprintf(fp_, "}\n\n");
fprintf(fp_, "} // namespace internal\n");
fprintf(fp_, "} // namespace v8\n");
}
void WriteData(const i::Vector<const i::byte>& blob) const {
fprintf(fp_, "static const byte blob_data[] = {\n");
WriteSnapshotData(blob);
fprintf(fp_, "};\n");
fprintf(fp_, "static const int blob_size = %d;\n", blob.length());
fprintf(fp_, "\n");
}
void WriteSnapshotData(const i::Vector<const i::byte>& blob) const {
for (int i = 0; i < blob.length(); i++) {
if ((i & 0x1f) == 0x1f) fprintf(fp_, "\n");
if (i > 0) fprintf(fp_, ",");
fprintf(fp_, "%u", static_cast<unsigned char>(blob.at(i)));
}
fprintf(fp_, "\n");
}
FILE* GetFileDescriptorOrDie(const char* filename) {
FILE* fp = base::OS::FOpen(filename, "wb");
if (fp == NULL) {
i::PrintF("Unable to open file \"%s\" for writing.\n", filename);
exit(1);
}
return fp;
}
FILE* fp_;
FILE* startup_blob_file_;
};
char* GetExtraCode(char* filename) {
if (filename == NULL || strlen(filename) == 0) return NULL;
::printf("Embedding extra script: %s\n", filename);
FILE* file = base::OS::FOpen(filename, "rb");
if (file == NULL) {
fprintf(stderr, "Failed to open '%s': errno %d\n", filename, errno);
exit(1);
}
fseek(file, 0, SEEK_END);
int size = ftell(file);
rewind(file);
char* chars = new char[size + 1];
chars[size] = '\0';
for (int i = 0; i < size;) {
int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
if (read < 0) {
fprintf(stderr, "Failed to read '%s': errno %d\n", filename, errno);
exit(1);
}
i += read;
}
fclose(file);
return chars;
}
int main(int argc, char** argv) {
// By default, log code create information in the snapshot.
i::FLAG_log_code = true;
// Omit from the snapshot natives for features that can be turned off
// at runtime.
i::FLAG_harmony_shipping = false;
i::FLAG_logfile_per_isolate = false;
// Print the usage if an error occurs when parsing the command line
// flags or if the help flag is set.
int result = i::FlagList::SetFlagsFromCommandLine(&argc, argv, true);
if (result > 0 || (argc != 2 && argc != 3) || i::FLAG_help) {
::printf("Usage: %s [flag] ... outfile\n", argv[0]);
i::FlagList::PrintHelp();
return !i::FLAG_help;
}
i::CpuFeatures::Probe(true);
V8::InitializeICU();
v8::Platform* platform = v8::platform::CreateDefaultPlatform();
v8::V8::InitializePlatform(platform);
v8::V8::Initialize();
{
SnapshotWriter writer(argv[1]);
if (i::FLAG_startup_blob) writer.SetStartupBlobFile(i::FLAG_startup_blob);
char* extra_code = GetExtraCode(argc == 3 ? argv[2] : NULL);
StartupData blob = v8::V8::CreateSnapshotDataBlob(extra_code);
CHECK(blob.data);
writer.WriteSnapshot(blob);
delete[] extra_code;
delete[] blob.data;
}
V8::Dispose();
V8::ShutdownPlatform();
delete platform;
return 0;
}
|
