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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef ScriptStreamer_h | 5 #ifndef ScriptStreamer_h |
6 #define ScriptStreamer_h | 6 #define ScriptStreamer_h |
7 | 7 |
8 #include "core/CoreExport.h" | 8 #include "core/CoreExport.h" |
9 #include "platform/heap/Handle.h" | 9 #include "platform/heap/Handle.h" |
10 #include "wtf/RefCounted.h" | 10 #include "wtf/RefCounted.h" |
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22 class SourceStream; | 22 class SourceStream; |
23 class WebTaskRunner; | 23 class WebTaskRunner; |
24 | 24 |
25 // ScriptStreamer streams incomplete script data to V8 so that it can be parsed | 25 // ScriptStreamer streams incomplete script data to V8 so that it can be parsed |
26 // while it's loaded. PendingScript holds a reference to ScriptStreamer. At the | 26 // while it's loaded. PendingScript holds a reference to ScriptStreamer. At the |
27 // moment, ScriptStreamer is only used for parser blocking scripts; this means | 27 // moment, ScriptStreamer is only used for parser blocking scripts; this means |
28 // that the Document stays stable and no other scripts are executing while we're | 28 // that the Document stays stable and no other scripts are executing while we're |
29 // streaming. It is possible, though, that Document and the PendingScript are | 29 // streaming. It is possible, though, that Document and the PendingScript are |
30 // destroyed while the streaming is in progress, and ScriptStreamer handles it | 30 // destroyed while the streaming is in progress, and ScriptStreamer handles it |
31 // gracefully. | 31 // gracefully. |
32 class CORE_EXPORT ScriptStreamer final : public RefCountedWillBeRefCountedGarbag eCollected<ScriptStreamer> { | 32 class CORE_EXPORT ScriptStreamer final : public RefCountedGarbageCollected<Scrip tStreamer> { |
sof
2016/04/02 06:34:27
(I wonder if this needs to be RefGC.)
| |
33 WTF_MAKE_NONCOPYABLE(ScriptStreamer); | 33 WTF_MAKE_NONCOPYABLE(ScriptStreamer); |
34 public: | 34 public: |
35 enum Type { | 35 enum Type { |
36 ParsingBlocking, | 36 ParsingBlocking, |
37 Deferred, | 37 Deferred, |
38 Async | 38 Async |
39 }; | 39 }; |
40 | 40 |
41 ~ScriptStreamer(); | 41 ~ScriptStreamer(); |
42 DECLARE_TRACE(); | 42 DECLARE_TRACE(); |
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91 s_smallScriptThreshold = threshold; | 91 s_smallScriptThreshold = threshold; |
92 } | 92 } |
93 | 93 |
94 static size_t smallScriptThreshold() { return s_smallScriptThreshold; } | 94 static size_t smallScriptThreshold() { return s_smallScriptThreshold; } |
95 | 95 |
96 private: | 96 private: |
97 // Scripts whose first data chunk is smaller than this constant won't be | 97 // Scripts whose first data chunk is smaller than this constant won't be |
98 // streamed. Non-const for testing. | 98 // streamed. Non-const for testing. |
99 static size_t s_smallScriptThreshold; | 99 static size_t s_smallScriptThreshold; |
100 | 100 |
101 static PassRefPtrWillBeRawPtr<ScriptStreamer> create(PendingScript* script, Type scriptType, ScriptState* scriptState, v8::ScriptCompiler::CompileOptions co mpileOptions, WebTaskRunner* loadingTaskRunner) | 101 static RawPtr<ScriptStreamer> create(PendingScript* script, Type scriptType, ScriptState* scriptState, v8::ScriptCompiler::CompileOptions compileOptions, We bTaskRunner* loadingTaskRunner) |
102 { | 102 { |
103 return adoptRefWillBeNoop(new ScriptStreamer(script, scriptType, scriptS tate, compileOptions, loadingTaskRunner)); | 103 return new ScriptStreamer(script, scriptType, scriptState, compileOption s, loadingTaskRunner); |
104 } | 104 } |
105 ScriptStreamer(PendingScript*, Type, ScriptState*, v8::ScriptCompiler::Compi leOptions, WebTaskRunner*); | 105 ScriptStreamer(PendingScript*, Type, ScriptState*, v8::ScriptCompiler::Compi leOptions, WebTaskRunner*); |
106 | 106 |
107 void streamingComplete(); | 107 void streamingComplete(); |
108 void notifyFinishedToClient(); | 108 void notifyFinishedToClient(); |
109 | 109 |
110 static bool startStreamingInternal(PendingScript*, Type, Settings*, ScriptSt ate*, WebTaskRunner*); | 110 static bool startStreamingInternal(PendingScript*, Type, Settings*, ScriptSt ate*, WebTaskRunner*); |
111 | 111 |
112 RawPtrWillBeMember<PendingScript> m_pendingScript; | 112 Member<PendingScript> m_pendingScript; |
113 // This pointer is weak. If PendingScript and its Resource are deleted | 113 // This pointer is weak. If PendingScript and its Resource are deleted |
114 // before ScriptStreamer, PendingScript will notify ScriptStreamer of its | 114 // before ScriptStreamer, PendingScript will notify ScriptStreamer of its |
115 // deletion by calling cancel(). | 115 // deletion by calling cancel(). |
116 RawPtrWillBeMember<ScriptResource> m_resource; | 116 Member<ScriptResource> m_resource; |
117 // Whether ScriptStreamer is detached from the Resource. In those cases, the | 117 // Whether ScriptStreamer is detached from the Resource. In those cases, the |
118 // script data is not needed any more, and the client won't get notified | 118 // script data is not needed any more, and the client won't get notified |
119 // when the loading and streaming are done. | 119 // when the loading and streaming are done. |
120 bool m_detached; | 120 bool m_detached; |
121 | 121 |
122 SourceStream* m_stream; | 122 SourceStream* m_stream; |
123 OwnPtr<v8::ScriptCompiler::StreamedSource> m_source; | 123 OwnPtr<v8::ScriptCompiler::StreamedSource> m_source; |
124 bool m_loadingFinished; // Whether loading from the network is done. | 124 bool m_loadingFinished; // Whether loading from the network is done. |
125 // Whether the V8 side processing is done. Will be used by the main thread | 125 // Whether the V8 side processing is done. Will be used by the main thread |
126 // and the streamer thread; guarded by m_mutex. | 126 // and the streamer thread; guarded by m_mutex. |
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150 | 150 |
151 // Encoding of the streamed script. Saved for sanity checking purposes. | 151 // Encoding of the streamed script. Saved for sanity checking purposes. |
152 v8::ScriptCompiler::StreamedSource::Encoding m_encoding; | 152 v8::ScriptCompiler::StreamedSource::Encoding m_encoding; |
153 | 153 |
154 OwnPtr<WebTaskRunner> m_loadingTaskRunner; | 154 OwnPtr<WebTaskRunner> m_loadingTaskRunner; |
155 }; | 155 }; |
156 | 156 |
157 } // namespace blink | 157 } // namespace blink |
158 | 158 |
159 #endif // ScriptStreamer_h | 159 #endif // ScriptStreamer_h |
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