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1 /* | 1 /* |
2 * Copyright (C) 2011 Google Inc. All rights reserved. | 2 * Copyright (C) 2011 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 */ | 29 */ |
30 | 30 |
31 #ifndef V8RecursionScope_h | 31 #ifndef V8RecursionScope_h |
32 #define V8RecursionScope_h | 32 #define V8RecursionScope_h |
33 | 33 |
34 #include "bindings/v8/V8PerIsolateData.h" | 34 #include "bindings/v8/V8PerIsolateData.h" |
35 #include "core/dom/ExecutionContext.h" | |
36 #include "wtf/Noncopyable.h" | 35 #include "wtf/Noncopyable.h" |
37 | 36 |
38 namespace WebCore { | 37 namespace WebCore { |
39 | 38 |
39 class ExecutionContext; | |
40 | |
40 // C++ calls into script contexts which are "owned" by WebKit (created in a | 41 // C++ calls into script contexts which are "owned" by WebKit (created in a |
41 // process where WebKit.cpp initializes v8) must declare their type: | 42 // process where WebKit.cpp initializes v8) must declare their type: |
42 // | 43 // |
43 // 1. Calls into page/author script from a frame | 44 // 1. Calls into page/author script from a frame |
44 // 2. Calls into page/author script from a worker | 45 // 2. Calls into page/author script from a worker |
45 // 3. Calls into internal script (typically setup/teardown work) | 46 // 3. Calls into internal script (typically setup/teardown work) |
46 // | 47 // |
47 // Debug-time checking of this is enforced via this class. | 48 // Debug-time checking of this is enforced via this class. |
48 // | 49 // |
49 // Calls of type (1) should generally go through ScriptController, as inspector | 50 // Calls of type (1) should generally go through ScriptController, as inspector |
50 // instrumentation is needed. ScriptController allocates V8RecursionScope for yo u. | 51 // instrumentation is needed. ScriptController allocates V8RecursionScope for yo u. |
51 // Calls of type (2) should always stack-allocate a V8RecursionScope in the same | 52 // Calls of type (2) should always stack-allocate a V8RecursionScope in the same |
52 // block as the call into script. Calls of type (3) should stack allocate a | 53 // block as the call into script. Calls of type (3) should stack allocate a |
53 // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to | 54 // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to |
54 // happen at the end of the outer-most script stack frame of calls into page scr ipt: | 55 // happen at the end of the outer-most script stack frame of calls into page scr ipt: |
55 // | 56 // |
56 // http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkp oint | 57 // http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkp oint |
57 class V8RecursionScope { | 58 class V8RecursionScope { |
58 WTF_MAKE_NONCOPYABLE(V8RecursionScope); | 59 WTF_MAKE_NONCOPYABLE(V8RecursionScope); |
59 public: | 60 public: |
60 explicit V8RecursionScope(ExecutionContext* context) | 61 explicit V8RecursionScope(ExecutionContext* context) |
61 : m_isDocumentContext(context && context->isDocument()) | 62 : m_context(context) |
62 { | 63 { |
63 V8PerIsolateData::current()->incrementRecursionLevel(); | 64 V8PerIsolateData::current()->incrementRecursionLevel(); |
64 } | 65 } |
65 | 66 |
66 ~V8RecursionScope() | 67 ~V8RecursionScope() |
67 { | 68 { |
68 if (!V8PerIsolateData::current()->decrementRecursionLevel()) | 69 if (!V8PerIsolateData::current()->decrementRecursionLevel()) |
69 didLeaveScriptContext(); | 70 didLeaveScriptContext(); |
70 } | 71 } |
71 | 72 |
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93 ~MicrotaskSuppression() | 94 ~MicrotaskSuppression() |
94 { | 95 { |
95 #ifndef NDEBUG | 96 #ifndef NDEBUG |
96 V8PerIsolateData::current()->decrementInternalScriptRecursionLevel() ; | 97 V8PerIsolateData::current()->decrementInternalScriptRecursionLevel() ; |
97 #endif | 98 #endif |
98 } | 99 } |
99 }; | 100 }; |
100 | 101 |
101 private: | 102 private: |
102 void didLeaveScriptContext(); | 103 void didLeaveScriptContext(); |
104 bool isStopped(); | |
103 | 105 |
104 bool m_isDocumentContext; | 106 ExecutionContext* m_context; |
adamk
2014/03/28 17:55:05
Can you explain why it's safe to store the context
| |
105 }; | 107 }; |
106 | 108 |
107 } // namespace WebCore | 109 } // namespace WebCore |
108 | 110 |
109 #endif // V8RecursionScope_h | 111 #endif // V8RecursionScope_h |
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