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1 // Copyright 2017 The Chromium 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 #include "base/at_exit.h" | |
6 #include "base/command_line.h" | |
7 #include "base/files/file_util.h" | |
8 #include "base/message_loop/message_loop.h" | |
9 #include "base/task_scheduler/task_scheduler.h" | |
10 #include "gin/v8_initializer.h" | |
11 #include "mojo/edk/embedder/embedder.h" | |
12 #include "third_party/WebKit/public/platform/WebThread.h" | |
13 #include "third_party/WebKit/public/web/WebKit.h" | |
14 #include "third_party/WebKit/public/web/WebV8SnapshotUtil.h" | |
15 #include "v8/include/v8.h" | |
16 | |
17 namespace { | |
18 | |
19 class SnapshotThread : public blink::WebThread { | |
20 public: | |
21 bool IsCurrentThread() const override { return true; } | |
22 blink::WebScheduler* Scheduler() const override { return nullptr; } | |
23 blink::WebTaskRunner* GetWebTaskRunner() override { return nullptr; } | |
24 }; | |
25 | |
26 class SnapshotPlatform final : public blink::Platform { | |
27 public: | |
28 bool IsToTakeV8Snapshot() override { return true; } | |
29 blink::WebThread* CurrentThread() override { | |
30 static SnapshotThread dummy_thread; | |
31 return &dummy_thread; | |
32 } | |
33 }; | |
34 | |
35 } // namespace | |
36 | |
37 // This program takes a snapshot of V8 contexts and writes it out as a file. | |
38 // We assume those contexts made in this program are used in Blink. | |
haraken
2017/07/04 15:04:20
We assume ... => The snapshot file is consumed by
peria
2017/07/07 06:22:04
Done.
| |
39 // | |
40 // Usage: | |
41 // % blink_v8_snapshot_generator --output_file=<filename> | |
42 int main(int argc, char** argv) { | |
43 base::AtExitManager at_exit; | |
44 base::CommandLine::Init(argc, argv); | |
45 #ifdef V8_USE_EXTERNAL_STARTUP_DATA | |
46 gin::V8Initializer::LoadV8Snapshot(); | |
47 gin::V8Initializer::LoadV8Natives(); | |
48 #endif | |
49 | |
50 // Set up environment to make Blink and V8 workable. | |
51 base::MessageLoop message_loop; | |
52 base::TaskScheduler::CreateAndStartWithDefaultParams("TakeSnapshot"); | |
53 mojo::edk::Init(); | |
54 | |
55 // Take snapshot | |
56 SnapshotPlatform platform; | |
57 blink::Initialize(&platform); | |
58 v8::StartupData blob = blink::WebV8SnapshotUtil::TakeSnapshot(); | |
59 | |
60 // Save snapshot as a file. Filename is given in a command line option. | |
61 base::FilePath file_path = | |
62 base::CommandLine::ForCurrentProcess()->GetSwitchValuePath("output_file"); | |
63 CHECK(!file_path.empty()); | |
64 base::WriteFile(file_path, blob.data, blob.raw_size); | |
haraken
2017/07/04 15:04:20
Shall we assert that we've written non-zero-byte d
peria
2017/07/07 06:22:04
Done.
| |
65 | |
66 delete[] blob.data; | |
67 | |
68 return 0; | |
69 } | |
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