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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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52 // 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 |
53 // 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 |
54 // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to | 54 // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to |
55 // 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: |
56 // | 56 // |
57 // 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 |
58 class CORE_EXPORT V8RecursionScope { | 58 class CORE_EXPORT V8RecursionScope { |
59 STACK_ALLOCATED(); | 59 STACK_ALLOCATED(); |
60 public: | 60 public: |
61 explicit V8RecursionScope(v8::Isolate* isolate) | 61 explicit V8RecursionScope(v8::Isolate* isolate) |
62 : m_isolate(isolate) | 62 : m_scope(isolate, v8::MicrotasksScope::kRunMicrotasks) |
63 { | 63 { |
64 V8PerIsolateData::from(m_isolate)->incrementRecursionLevel(); | 64 ASSERT(isolate->GetMicrotasksPolicy() == v8::MicrotasksPolicy::kScoped); |
65 // If you want V8 to autorun microtasks, this class needs to have a | |
66 // v8::Isolate::SuppressMicrotaskExecutionScope member. | |
67 ASSERT(!isolate->WillAutorunMicrotasks()); | |
68 } | 65 } |
69 | 66 |
70 ~V8RecursionScope() | 67 ~V8RecursionScope() |
71 { | 68 { |
72 if (!V8PerIsolateData::from(m_isolate)->decrementRecursionLevel()) | |
73 didLeaveScriptContext(); | |
74 } | 69 } |
75 | 70 |
76 static int recursionLevel(v8::Isolate* isolate) | 71 static int recursionLevel(v8::Isolate* isolate) |
77 { | 72 { |
78 return V8PerIsolateData::from(isolate)->recursionLevel(); | 73 return v8::MicrotasksScope::GetCurrentDepth(isolate); |
79 } | 74 } |
80 | 75 |
81 #if ENABLE(ASSERT) | |
82 static bool properlyUsed(v8::Isolate* isolate) | |
83 { | |
84 return recursionLevel(isolate) > 0 || V8PerIsolateData::from(isolate)->i
nternalScriptRecursionLevel() > 0; | |
85 } | |
86 #endif | |
87 | |
88 class MicrotaskSuppression { | 76 class MicrotaskSuppression { |
89 USING_FAST_MALLOC(MicrotaskSuppression); | 77 USING_FAST_MALLOC(MicrotaskSuppression); |
90 WTF_MAKE_NONCOPYABLE(MicrotaskSuppression); | 78 WTF_MAKE_NONCOPYABLE(MicrotaskSuppression); |
91 public: | 79 public: |
92 MicrotaskSuppression(v8::Isolate* isolate) | 80 explicit MicrotaskSuppression(v8::Isolate* isolate) |
93 #if ENABLE(ASSERT) | 81 : m_scope(isolate, v8::MicrotasksScope::kDoNotRunMicrotasks) |
94 : m_isolate(isolate) | |
95 #endif | |
96 { | 82 { |
97 #if ENABLE(ASSERT) | |
98 V8PerIsolateData::from(m_isolate)->incrementInternalScriptRecursionL
evel(); | |
99 #endif | |
100 } | 83 } |
101 | 84 |
102 ~MicrotaskSuppression() | 85 ~MicrotaskSuppression() |
103 { | 86 { |
104 #if ENABLE(ASSERT) | |
105 V8PerIsolateData::from(m_isolate)->decrementInternalScriptRecursionL
evel(); | |
106 #endif | |
107 } | 87 } |
108 | 88 |
109 private: | 89 private: |
110 #if ENABLE(ASSERT) | 90 v8::MicrotasksScope m_scope; |
111 v8::Isolate* m_isolate; | |
112 #endif | |
113 }; | 91 }; |
114 | 92 |
115 private: | 93 private: |
116 void didLeaveScriptContext(); | 94 v8::MicrotasksScope m_scope; |
117 | |
118 v8::Isolate* m_isolate; | |
119 }; | 95 }; |
120 | 96 |
121 } // namespace blink | 97 } // namespace blink |
122 | 98 |
123 #endif // V8RecursionScope_h | 99 #endif // V8RecursionScope_h |
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