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/*
* Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2008 David Smith <catfish.man@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_DOM_NODE_RARE_DATA_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_NODE_RARE_DATA_H_
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/heap/thread_state.h"
#include "third_party/blink/renderer/platform/wtf/bit_field.h"
#include "third_party/blink/renderer/platform/wtf/buildflags.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
namespace blink {
class ComputedStyle;
enum class DynamicRestyleFlags;
enum class ElementFlags;
class FlatTreeNodeData;
class LayoutObject;
class MutationObserverRegistration;
class NodeListsNodeData;
class ScrollTimeline;
class NodeMutationObserverData final
: public GarbageCollected<NodeMutationObserverData> {
public:
NodeMutationObserverData() = default;
NodeMutationObserverData(const NodeMutationObserverData&) = delete;
NodeMutationObserverData& operator=(const NodeMutationObserverData&) = delete;
const HeapVector<Member<MutationObserverRegistration>>& Registry() {
return registry_;
}
const HeapHashSet<Member<MutationObserverRegistration>>& TransientRegistry() {
return transient_registry_;
}
void AddTransientRegistration(MutationObserverRegistration* registration);
void RemoveTransientRegistration(MutationObserverRegistration* registration);
void AddRegistration(MutationObserverRegistration* registration);
void RemoveRegistration(MutationObserverRegistration* registration);
void Trace(Visitor* visitor) const;
private:
HeapVector<Member<MutationObserverRegistration>> registry_;
HeapHashSet<Member<MutationObserverRegistration>> transient_registry_;
};
class GC_PLUGIN_IGNORE(
"GC plugin reports that TraceAfterDispatch is not called but it is called "
"by both NodeRareDate::TraceAfterDispatch and "
"NodeRenderingData::TraceAfterDispatch.") NodeData
: public GarbageCollected<NodeData> {
public:
NodeData(bool is_rare_data, bool is_element_rare_data)
: connected_frame_count_(0),
element_flags_(0),
bit_field_(RestyleFlags::encode(0) |
IsElementRareData::encode(is_element_rare_data) |
IsRareData::encode(is_rare_data)) {
DCHECK(!is_element_rare_data || is_rare_data);
}
void Trace(Visitor*) const;
void TraceAfterDispatch(blink::Visitor*) const {}
enum {
kConnectedFrameCountBits = 10, // Must fit Page::maxNumberOfFrames.
kNumberOfElementFlags = 6,
kNumberOfDynamicRestyleFlags = 14
};
protected:
using BitField = WTF::ConcurrentlyReadBitField<uint16_t>;
using RestyleFlags =
BitField::DefineFirstValue<uint16_t, kNumberOfDynamicRestyleFlags>;
using IsElementRareData = RestyleFlags::
DefineNextValue<bool, 1, WTF::BitFieldValueConstness::kConst>;
using IsRareData = IsElementRareData::
DefineNextValue<bool, 1, WTF::BitFieldValueConstness::kConst>;
uint16_t connected_frame_count_ : kConnectedFrameCountBits;
uint16_t element_flags_ : kNumberOfElementFlags;
BitField bit_field_;
};
class GC_PLUGIN_IGNORE("Manual dispatch implemented in NodeData.")
NodeRenderingData final : public NodeData {
public:
NodeRenderingData(LayoutObject*,
scoped_refptr<const ComputedStyle> computed_style);
NodeRenderingData(const NodeRenderingData&) = delete;
NodeRenderingData& operator=(const NodeRenderingData&) = delete;
LayoutObject* GetLayoutObject() const { return layout_object_; }
void SetLayoutObject(LayoutObject* layout_object) {
DCHECK_NE(&SharedEmptyData(), this);
layout_object_ = layout_object;
}
const ComputedStyle* GetComputedStyle() const {
return computed_style_.get();
}
void SetComputedStyle(scoped_refptr<const ComputedStyle> computed_style);
static NodeRenderingData& SharedEmptyData();
bool IsSharedEmptyData() { return this == &SharedEmptyData(); }
void TraceAfterDispatch(Visitor* visitor) const {
NodeData::TraceAfterDispatch(visitor);
}
private:
LayoutObject* layout_object_;
scoped_refptr<const ComputedStyle> computed_style_;
};
class GC_PLUGIN_IGNORE("Manual dispatch implemented in NodeData.") NodeRareData
: public NodeData {
public:
explicit NodeRareData(NodeRenderingData* node_layout_data)
: NodeRareData(node_layout_data, false) {}
NodeRareData(const NodeRareData&) = delete;
NodeRareData& operator=(const NodeRareData&) = delete;
NodeRenderingData* GetNodeRenderingData() const { return node_layout_data_; }
void SetNodeRenderingData(NodeRenderingData* node_layout_data) {
DCHECK(node_layout_data);
node_layout_data_ = node_layout_data;
}
void ClearNodeLists() { node_lists_.Clear(); }
NodeListsNodeData* NodeLists() const { return node_lists_.Get(); }
// EnsureNodeLists() and a following NodeListsNodeData functions must be
// wrapped with a ThreadState::GCForbiddenScope in order to avoid an
// initialized node_lists_ is cleared by NodeRareData::TraceAfterDispatch().
NodeListsNodeData& EnsureNodeLists() {
if (!node_lists_)
return CreateNodeLists();
return *node_lists_;
}
FlatTreeNodeData* GetFlatTreeNodeData() const { return flat_tree_node_data_; }
FlatTreeNodeData& EnsureFlatTreeNodeData();
NodeMutationObserverData* MutationObserverData() {
return mutation_observer_data_.Get();
}
NodeMutationObserverData& EnsureMutationObserverData() {
if (!mutation_observer_data_) {
mutation_observer_data_ =
MakeGarbageCollected<NodeMutationObserverData>();
}
return *mutation_observer_data_;
}
uint16_t ConnectedSubframeCount() const { return connected_frame_count_; }
void IncrementConnectedSubframeCount();
void DecrementConnectedSubframeCount() {
DCHECK(connected_frame_count_);
--connected_frame_count_;
}
bool HasElementFlag(ElementFlags mask) const {
return element_flags_ & static_cast<uint16_t>(mask);
}
void SetElementFlag(ElementFlags mask, bool value) {
element_flags_ =
(element_flags_ & ~static_cast<uint16_t>(mask)) |
(-static_cast<uint16_t>(value) & static_cast<uint16_t>(mask));
}
void ClearElementFlag(ElementFlags mask) {
element_flags_ &= ~static_cast<uint16_t>(mask);
}
bool HasRestyleFlag(DynamicRestyleFlags mask) const {
return bit_field_.get<RestyleFlags>() & static_cast<uint16_t>(mask);
}
void SetRestyleFlag(DynamicRestyleFlags mask) {
bit_field_.set<RestyleFlags>(bit_field_.get<RestyleFlags>() |
static_cast<uint16_t>(mask));
CHECK(bit_field_.get<RestyleFlags>());
}
bool HasRestyleFlags() const { return bit_field_.get<RestyleFlags>(); }
void ClearRestyleFlags() { bit_field_.set<RestyleFlags>(0); }
void TraceAfterDispatch(blink::Visitor*) const;
void FinalizeGarbageCollectedObject();
void RegisterScrollTimeline(ScrollTimeline*);
void UnregisterScrollTimeline(ScrollTimeline*);
protected:
explicit NodeRareData(NodeRenderingData* node_layout_data,
bool is_element_rare_data)
: NodeData(true, is_element_rare_data),
node_layout_data_(node_layout_data) {
CHECK_NE(node_layout_data, nullptr);
}
Member<NodeRenderingData> node_layout_data_;
private:
NodeListsNodeData& CreateNodeLists();
Member<NodeListsNodeData> node_lists_;
Member<NodeMutationObserverData> mutation_observer_data_;
Member<FlatTreeNodeData> flat_tree_node_data_;
// Keeps strong scroll timeline pointers linked to this node to ensure
// the timelines are alive as long as the node is alive.
Member<HeapHashSet<Member<ScrollTimeline>>> scroll_timelines_;
};
#if BUILDFLAG(USE_V8_OILPAN)
template <typename T>
struct ThreadingTrait<
T,
std::enable_if_t<std::is_base_of<blink::NodeRareData, T>::value>> {
static constexpr ThreadAffinity kAffinity = kMainThreadOnly;
};
#endif // USE_V8_OILPAN
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_NODE_RARE_DATA_H_
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