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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
108 lines
4.2 KiB
C++
108 lines
4.2 KiB
C++
/*
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* Copyright (C) 2013 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
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* are met:
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*
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* 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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* 3. Neither the name of Google Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* 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_CORE_DOM_CUSTOM_CUSTOMELEMENTPROCESSINGSTACK_H_
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#define SKY_ENGINE_CORE_DOM_CUSTOM_CUSTOMELEMENTPROCESSINGSTACK_H_
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#include "sky/engine/core/dom/custom/CustomElementCallbackQueue.h"
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#include "sky/engine/wtf/Vector.h"
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namespace blink {
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class CustomElementScheduler;
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class CustomElementProcessingStack {
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WTF_MAKE_NONCOPYABLE(CustomElementProcessingStack);
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public:
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// This is stack allocated in many DOM callbacks. Make it cheap.
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class CallbackDeliveryScope {
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public:
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CallbackDeliveryScope()
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: m_savedElementQueueStart(s_elementQueueStart)
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{
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s_elementQueueStart = s_elementQueueEnd;
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}
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~CallbackDeliveryScope()
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{
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if (s_elementQueueStart != s_elementQueueEnd)
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processElementQueueAndPop();
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s_elementQueueStart = m_savedElementQueueStart;
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}
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private:
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size_t m_savedElementQueueStart;
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};
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static bool inCallbackDeliveryScope() { return s_elementQueueStart; }
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protected:
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friend class CustomElementScheduler;
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static CustomElementProcessingStack& instance();
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void enqueue(CustomElementCallbackQueue*);
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private:
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CustomElementProcessingStack()
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{
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// Add a null element as a sentinel. This makes it possible to
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// identify elements queued when there is no
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// CallbackDeliveryScope active. Also, if the processing stack
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// is popped when empty, this sentinel will cause a null deref
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// crash.
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CustomElementCallbackQueue* sentinel = 0;
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for (size_t i = 0; i < kNumSentinels; i++)
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m_flattenedProcessingStack.append(sentinel);
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ASSERT(s_elementQueueEnd == m_flattenedProcessingStack.size());
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}
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// The start of the element queue on the top of the processing
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// stack. An offset into instance().m_flattenedProcessingStack.
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static size_t s_elementQueueStart;
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// The end of the element queue on the top of the processing
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// stack. A cache of instance().m_flattenedProcessingStack.size().
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static size_t s_elementQueueEnd;
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static CustomElementCallbackQueue::ElementQueueId currentElementQueue() { return CustomElementCallbackQueue::ElementQueueId(s_elementQueueStart); }
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static void processElementQueueAndPop();
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void processElementQueueAndPop(size_t start, size_t end);
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// The processing stack, flattened. Element queues lower in the
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// stack appear toward the head of the vector. The first element
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// is a null sentinel value.
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static const size_t kNumSentinels = 1;
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Vector<CustomElementCallbackQueue*> m_flattenedProcessingStack;
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};
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}
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#endif // SKY_ENGINE_CORE_DOM_CUSTOM_CUSTOMELEMENTPROCESSINGSTACK_H_
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