| /* |
| * Copyright (C) 2012 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * 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. |
| */ |
| |
| #include "third_party/blink/renderer/core/dom/node_rare_data.h" |
| |
| #include "third_party/blink/renderer/core/dom/container_node.h" |
| #include "third_party/blink/renderer/core/dom/element.h" |
| #include "third_party/blink/renderer/core/dom/element_rare_data.h" |
| #include "third_party/blink/renderer/core/dom/flat_tree_node_data.h" |
| #include "third_party/blink/renderer/core/dom/mutation_observer_registration.h" |
| #include "third_party/blink/renderer/core/dom/node_lists_node_data.h" |
| #include "third_party/blink/renderer/core/page/page.h" |
| #include "third_party/blink/renderer/core/style/computed_style.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| |
| namespace blink { |
| |
| struct SameSizeAsNodeRareData { |
| Member<void*> willbe_member_[4]; |
| unsigned bitfields_; |
| }; |
| |
| static_assert(sizeof(NodeRareData) == sizeof(SameSizeAsNodeRareData), |
| "NodeRareData should stay small"); |
| |
| void NodeMutationObserverData::Trace(Visitor* visitor) { |
| visitor->Trace(registry_); |
| visitor->Trace(transient_registry_); |
| } |
| |
| void NodeMutationObserverData::AddTransientRegistration( |
| MutationObserverRegistration* registration) { |
| transient_registry_.insert(registration); |
| } |
| |
| void NodeMutationObserverData::RemoveTransientRegistration( |
| MutationObserverRegistration* registration) { |
| DCHECK(transient_registry_.Contains(registration)); |
| transient_registry_.erase(registration); |
| } |
| |
| void NodeMutationObserverData::AddRegistration( |
| MutationObserverRegistration* registration) { |
| registry_.push_back(registration); |
| } |
| |
| void NodeMutationObserverData::RemoveRegistration( |
| MutationObserverRegistration* registration) { |
| DCHECK(registry_.Contains(registration)); |
| registry_.EraseAt(registry_.Find(registration)); |
| } |
| |
| void NodeData::Trace(Visitor* visitor) { |
| if (bit_field_.get_concurrently<IsRareData>()) { |
| if (bit_field_.get_concurrently<IsElementRareData>()) |
| static_cast<ElementRareData*>(this)->TraceAfterDispatch(visitor); |
| else |
| static_cast<NodeRareData*>(this)->TraceAfterDispatch(visitor); |
| } else { |
| static_cast<NodeRenderingData*>(this)->TraceAfterDispatch(visitor); |
| } |
| } |
| |
| NodeRenderingData::NodeRenderingData( |
| LayoutObject* layout_object, |
| scoped_refptr<const ComputedStyle> computed_style) |
| : NodeData(false, false), |
| layout_object_(layout_object), |
| computed_style_(computed_style) {} |
| |
| void NodeRenderingData::SetComputedStyle( |
| scoped_refptr<const ComputedStyle> computed_style) { |
| DCHECK_NE(&SharedEmptyData(), this); |
| computed_style_ = computed_style; |
| } |
| |
| NodeRenderingData& NodeRenderingData::SharedEmptyData() { |
| DEFINE_STATIC_LOCAL( |
| Persistent<NodeRenderingData>, shared_empty_data, |
| (MakeGarbageCollected<NodeRenderingData>(nullptr, nullptr))); |
| return *shared_empty_data; |
| } |
| |
| void NodeRareData::TraceAfterDispatch(blink::Visitor* visitor) const { |
| visitor->Trace(mutation_observer_data_); |
| visitor->Trace(flat_tree_node_data_); |
| visitor->Trace(node_layout_data_); |
| visitor->Trace(node_lists_); |
| NodeData::TraceAfterDispatch(visitor); |
| } |
| |
| void NodeRareData::FinalizeGarbageCollectedObject() { |
| if (bit_field_.get<IsElementRareData>()) |
| static_cast<ElementRareData*>(this)->~ElementRareData(); |
| else |
| this->~NodeRareData(); |
| } |
| |
| void NodeRareData::IncrementConnectedSubframeCount() { |
| SECURITY_CHECK((connected_frame_count_ + 1) <= Page::kMaxNumberOfFrames); |
| ++connected_frame_count_; |
| } |
| |
| NodeListsNodeData& NodeRareData::CreateNodeLists() { |
| node_lists_ = MakeGarbageCollected<NodeListsNodeData>(); |
| return *node_lists_; |
| } |
| |
| FlatTreeNodeData& NodeRareData::EnsureFlatTreeNodeData() { |
| if (!flat_tree_node_data_) |
| flat_tree_node_data_ = MakeGarbageCollected<FlatTreeNodeData>(); |
| return *flat_tree_node_data_; |
| } |
| |
| // Ensure the 10 bits reserved for the connected_frame_count_ cannot overflow. |
| static_assert(Page::kMaxNumberOfFrames < |
| (1 << NodeRareData::kConnectedFrameCountBits), |
| "Frame limit should fit in rare data count"); |
| static_assert(static_cast<int>(NodeRareData::kNumberOfElementFlags) == |
| static_cast<int>(ElementFlags::kNumberOfElementFlags), |
| "kNumberOfElementFlags must match."); |
| static_assert( |
| static_cast<int>(NodeRareData::kNumberOfDynamicRestyleFlags) == |
| static_cast<int>(DynamicRestyleFlags::kNumberOfDynamicRestyleFlags), |
| "kNumberOfDynamicRestyleFlags must match."); |
| |
| } // namespace blink |