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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/core/v8/V8PerIsolateData.h" | 34 #include "bindings/core/v8/V8PerIsolateData.h" |
35 #include "core/CoreExport.h" | |
36 #include "platform/ScriptForbiddenScope.h" | 35 #include "platform/ScriptForbiddenScope.h" |
37 #include "wtf/Noncopyable.h" | 36 #include "wtf/Noncopyable.h" |
38 #include <v8.h> | 37 #include <v8.h> |
39 | 38 |
40 namespace blink { | 39 namespace blink { |
41 | 40 |
42 // 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 |
43 // process where WebKit.cpp initializes v8) must declare their type: | 42 // process where WebKit.cpp initializes v8) must declare their type: |
44 // | 43 // |
45 // 1. Calls into page/author script from a frame | 44 // 1. Calls into page/author script from a frame |
46 // 2. Calls into page/author script from a worker | 45 // 2. Calls into page/author script from a worker |
47 // 3. Calls into internal script (typically setup/teardown work) | 46 // 3. Calls into internal script (typically setup/teardown work) |
48 // | 47 // |
49 // Debug-time checking of this is enforced via this class. | 48 // Debug-time checking of this is enforced via this class. |
50 // | 49 // |
51 // Calls of type (1) should generally go through ScriptController, as inspector | 50 // Calls of type (1) should generally go through ScriptController, as inspector |
52 // instrumentation is needed. ScriptController allocates V8RecursionScope for yo
u. | 51 // instrumentation is needed. ScriptController allocates V8RecursionScope for yo
u. |
53 // 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 |
54 // 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 |
55 // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to | 54 // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to |
56 // 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: |
57 // | 56 // |
58 // 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 |
59 class CORE_EXPORT V8RecursionScope { | 58 class V8RecursionScope { |
60 STACK_ALLOCATED(); | 59 STACK_ALLOCATED(); |
61 public: | 60 public: |
62 explicit V8RecursionScope(v8::Isolate* isolate) | 61 explicit V8RecursionScope(v8::Isolate* isolate) |
63 : m_isolate(isolate) | 62 : m_isolate(isolate) |
64 { | 63 { |
65 RELEASE_ASSERT(!ScriptForbiddenScope::isScriptForbidden()); | 64 RELEASE_ASSERT(!ScriptForbiddenScope::isScriptForbidden()); |
66 V8PerIsolateData::from(m_isolate)->incrementRecursionLevel(); | 65 V8PerIsolateData::from(m_isolate)->incrementRecursionLevel(); |
67 // If you want V8 to autorun microtasks, this class needs to have a | 66 // If you want V8 to autorun microtasks, this class needs to have a |
68 // v8::Isolate::SuppressMicrotaskExecutionScope member. | 67 // v8::Isolate::SuppressMicrotaskExecutionScope member. |
69 ASSERT(!isolate->WillAutorunMicrotasks()); | 68 ASSERT(!isolate->WillAutorunMicrotasks()); |
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117 | 116 |
118 private: | 117 private: |
119 void didLeaveScriptContext(); | 118 void didLeaveScriptContext(); |
120 | 119 |
121 v8::Isolate* m_isolate; | 120 v8::Isolate* m_isolate; |
122 }; | 121 }; |
123 | 122 |
124 } // namespace blink | 123 } // namespace blink |
125 | 124 |
126 #endif // V8RecursionScope_h | 125 #endif // V8RecursionScope_h |
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