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295f920116
I wrote a script to do this which is attached to the bug. TBR=abarth@chromium.org BUG=435361 Review URL: https://codereview.chromium.org/736373003
125 lines
4.5 KiB
C++
125 lines
4.5 KiB
C++
/*
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* Copyright (C) 2011 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_BINDINGS_CORE_V8_V8RECURSIONSCOPE_H_
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#define SKY_ENGINE_BINDINGS_CORE_V8_V8RECURSIONSCOPE_H_
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#include "sky/engine/bindings/core/v8/V8PerIsolateData.h"
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#include "sky/engine/core/dom/ExecutionContext.h"
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#include "sky/engine/platform/ScriptForbiddenScope.h"
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#include "sky/engine/wtf/Noncopyable.h"
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#include "v8/include/v8.h"
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namespace blink {
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// C++ calls into script contexts which are "owned" by WebKit (created in a
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// process where WebKit.cpp initializes v8) must declare their type:
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//
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// 1. Calls into page/author script from a frame
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// 2. Calls into page/author script from a worker
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// 3. Calls into internal script (typically setup/teardown work)
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//
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// Debug-time checking of this is enforced via this class.
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//
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// Calls of type (1) should generally go through ScriptController, as inspector
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// instrumentation is needed. ScriptController allocates V8RecursionScope for you.
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// Calls of type (2) should always stack-allocate a V8RecursionScope in the same
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// block as the call into script. Calls of type (3) should stack allocate a
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// V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to
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// happen at the end of the outer-most script stack frame of calls into page script:
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//
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// http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkpoint
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class V8RecursionScope {
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WTF_MAKE_NONCOPYABLE(V8RecursionScope);
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public:
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V8RecursionScope(v8::Isolate* isolate, ExecutionContext* context)
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: m_isolate(isolate)
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{
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V8PerIsolateData::from(m_isolate)->incrementRecursionLevel();
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RELEASE_ASSERT(!ScriptForbiddenScope::isScriptForbidden());
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// If you want V8 to autorun microtasks, this class needs to have a
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// v8::Isolate::SuppressMicrotaskExecutionScope member.
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ASSERT(!isolate->WillAutorunMicrotasks());
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}
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~V8RecursionScope()
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{
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if (!V8PerIsolateData::from(m_isolate)->decrementRecursionLevel())
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didLeaveScriptContext();
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}
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static int recursionLevel(v8::Isolate* isolate)
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{
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return V8PerIsolateData::from(isolate)->recursionLevel();
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}
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#if ENABLE(ASSERT)
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static bool properlyUsed(v8::Isolate* isolate)
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{
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return recursionLevel(isolate) > 0 || V8PerIsolateData::from(isolate)->internalScriptRecursionLevel() > 0;
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}
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#endif
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class MicrotaskSuppression {
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public:
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MicrotaskSuppression(v8::Isolate* isolate)
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#if ENABLE(ASSERT)
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: m_isolate(isolate)
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#endif
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{
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ASSERT(!ScriptForbiddenScope::isScriptForbidden());
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#if ENABLE(ASSERT)
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V8PerIsolateData::from(m_isolate)->incrementInternalScriptRecursionLevel();
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#endif
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}
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~MicrotaskSuppression()
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{
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#if ENABLE(ASSERT)
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V8PerIsolateData::from(m_isolate)->decrementInternalScriptRecursionLevel();
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#endif
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}
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private:
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#if ENABLE(ASSERT)
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v8::Isolate* m_isolate;
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#endif
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};
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private:
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void didLeaveScriptContext();
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v8::Isolate* m_isolate;
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};
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} // namespace blink
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#endif // SKY_ENGINE_BINDINGS_CORE_V8_V8RECURSIONSCOPE_H_
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