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77 lines
3.0 KiB
C++
77 lines
3.0 KiB
C++
/*
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* Copyright (C) 2012 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 WebScopedMicrotaskSuppression_h
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#define WebScopedMicrotaskSuppression_h
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#include "../platform/WebPrivateOwnPtr.h"
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namespace blink {
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// This class wraps V8RecursionScope::BypassMicrotaskCheckpoint. Please
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// see V8RecursionScope.h for full usage. Short story: Embedder calls into
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// script contexts which also host page script must do one of two things:
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//
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// 1. If the call may cause any page/author script to run, it must be
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// captured for pre/post work (e.g. inspector instrumentation/microtask
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// delivery) and thus be invoked through WebFrame (e.g. executeScript*,
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// callFunction*).
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// 2. If the call will not cause any page/author script to run, the call
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// should be made directly via the v8 context, but the callsite must be
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// accompanied by a stack allocated WebScopedMicrotaskSuppression, e.g.:
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//
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// ...
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// {
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// blink::WebScopedMicrotaskSuppression suppression;
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// func->Call(global, argv, args);
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// }
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// ...
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//
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class WebScopedMicrotaskSuppression {
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public:
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WebScopedMicrotaskSuppression() { initialize(); }
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~WebScopedMicrotaskSuppression() { reset(); }
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private:
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BLINK_EXPORT void initialize();
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BLINK_EXPORT void reset();
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// Always declare this data member. When assertions are on in
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// Release builds of Blink, this header may be included from
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// Chromium with different preprocessor options than used when
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// building Blink itself.
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class Impl;
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WebPrivateOwnPtr<Impl> m_impl;
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};
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} // WebKit
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#endif
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