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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of Google Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_V0_CUSTOM_ELEMENT_PROCESSING_STACK_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_V0_CUSTOM_ELEMENT_PROCESSING_STACK_H_
#include "base/macros.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/html/custom/v0_custom_element_callback_queue.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class CORE_EXPORT V0CustomElementProcessingStack
: public GarbageCollected<V0CustomElementProcessingStack> {
public:
// This is stack allocated in many DOM callbacks. Make it cheap.
class CallbackDeliveryScope {
STACK_ALLOCATED();
public:
CallbackDeliveryScope() : saved_element_queue_start_(element_queue_start_) {
element_queue_start_ = element_queue_end_;
}
~CallbackDeliveryScope() {
if (element_queue_start_ != element_queue_end_)
ProcessElementQueueAndPop();
element_queue_start_ = saved_element_queue_start_;
}
private:
wtf_size_t saved_element_queue_start_;
};
static bool InCallbackDeliveryScope() { return element_queue_start_; }
V0CustomElementProcessingStack() {
// Add a null element as a sentinel. This makes it possible to
// identify elements queued when there is no
// CallbackDeliveryScope active. Also, if the processing stack
// is popped when empty, this sentinel will cause a null deref
// crash.
V0CustomElementCallbackQueue* sentinel = nullptr;
for (wtf_size_t i = 0; i < kNumSentinels; i++)
flattened_processing_stack_.push_back(sentinel);
DCHECK_EQ(element_queue_end_, flattened_processing_stack_.size());
}
static V0CustomElementProcessingStack& Instance();
void Enqueue(V0CustomElementCallbackQueue*);
void Trace(Visitor*);
private:
// The start of the element queue on the top of the processing
// stack. An offset into Instance().flattened_processing_stack_.
static wtf_size_t element_queue_start_;
// The end of the element queue on the top of the processing
// stack. A cache of Instance().flattened_processing_stack_.size().
static wtf_size_t element_queue_end_;
static V0CustomElementCallbackQueue::ElementQueueId CurrentElementQueue() {
return V0CustomElementCallbackQueue::ElementQueueId(element_queue_start_);
}
static void ProcessElementQueueAndPop();
void ProcessElementQueueAndPop(wtf_size_t start, wtf_size_t end);
// The processing stack, flattened. Element queues lower in the
// stack appear toward the head of the vector. The first element
// is a null sentinel value.
static const wtf_size_t kNumSentinels = 1;
HeapVector<Member<V0CustomElementCallbackQueue>> flattened_processing_stack_;
DISALLOW_COPY_AND_ASSIGN(V0CustomElementProcessingStack);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_V0_CUSTOM_ELEMENT_PROCESSING_STACK_H_
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