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      1 /*
      2  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
      3  * Copyright (C) 2008 David Smith <catfish.man (at) gmail.com>
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #ifndef NodeRareData_h
     23 #define NodeRareData_h
     24 
     25 #include "core/dom/MutationObserverRegistration.h"
     26 #include "core/dom/NodeListsNodeData.h"
     27 #include "platform/heap/Handle.h"
     28 #include "wtf/HashSet.h"
     29 #include "wtf/OwnPtr.h"
     30 #include "wtf/PassOwnPtr.h"
     31 
     32 namespace blink {
     33 
     34 class NodeMutationObserverData FINAL : public NoBaseWillBeGarbageCollected<NodeMutationObserverData> {
     35     WTF_MAKE_NONCOPYABLE(NodeMutationObserverData);
     36     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     37 public:
     38     WillBeHeapVector<OwnPtrWillBeMember<MutationObserverRegistration> > registry;
     39     WillBeHeapHashSet<RawPtrWillBeMember<MutationObserverRegistration> > transientRegistry;
     40 
     41     static PassOwnPtrWillBeRawPtr<NodeMutationObserverData> create()
     42     {
     43         return adoptPtrWillBeNoop(new NodeMutationObserverData);
     44     }
     45 
     46     void trace(Visitor* visitor)
     47     {
     48 #if ENABLE(OILPAN)
     49         visitor->trace(registry);
     50         visitor->trace(transientRegistry);
     51 #endif
     52     }
     53 
     54 private:
     55     NodeMutationObserverData() { }
     56 };
     57 
     58 class NodeRareData : public NoBaseWillBeGarbageCollectedFinalized<NodeRareData>, public NodeRareDataBase {
     59     WTF_MAKE_NONCOPYABLE(NodeRareData);
     60     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     61 public:
     62     static NodeRareData* create(RenderObject* renderer)
     63     {
     64         return new NodeRareData(renderer);
     65     }
     66 
     67     void clearNodeLists() { m_nodeLists.clear(); }
     68     NodeListsNodeData* nodeLists() const { return m_nodeLists.get(); }
     69     NodeListsNodeData& ensureNodeLists()
     70     {
     71         if (!m_nodeLists)
     72             m_nodeLists = NodeListsNodeData::create();
     73         return *m_nodeLists;
     74     }
     75 
     76     NodeMutationObserverData* mutationObserverData() { return m_mutationObserverData.get(); }
     77     NodeMutationObserverData& ensureMutationObserverData()
     78     {
     79         if (!m_mutationObserverData)
     80             m_mutationObserverData = NodeMutationObserverData::create();
     81         return *m_mutationObserverData;
     82     }
     83 
     84     unsigned connectedSubframeCount() const { return m_connectedFrameCount; }
     85     void incrementConnectedSubframeCount(unsigned amount)
     86     {
     87         m_connectedFrameCount += amount;
     88     }
     89     void decrementConnectedSubframeCount(unsigned amount)
     90     {
     91         ASSERT(m_connectedFrameCount);
     92         ASSERT(amount <= m_connectedFrameCount);
     93         m_connectedFrameCount -= amount;
     94     }
     95 
     96     bool hasElementFlag(ElementFlags mask) const { return m_elementFlags & mask; }
     97     void setElementFlag(ElementFlags mask, bool value) { m_elementFlags = (m_elementFlags & ~mask) | (-(int32_t)value & mask); }
     98     void clearElementFlag(ElementFlags mask) { m_elementFlags &= ~mask; }
     99 
    100     bool hasRestyleFlag(DynamicRestyleFlags mask) const { return m_restyleFlags & mask; }
    101     void setRestyleFlag(DynamicRestyleFlags mask) { m_restyleFlags |= mask; RELEASE_ASSERT(m_restyleFlags); }
    102     bool hasRestyleFlags() const { return m_restyleFlags; }
    103     void clearRestyleFlags() { m_restyleFlags = 0; }
    104 
    105     enum {
    106         ConnectedFrameCountBits = 10, // Must fit Page::maxNumberOfFrames.
    107     };
    108 
    109     void trace(Visitor*);
    110 
    111     void traceAfterDispatch(Visitor*);
    112     void finalizeGarbageCollectedObject();
    113 
    114 protected:
    115     explicit NodeRareData(RenderObject* renderer)
    116         : NodeRareDataBase(renderer)
    117         , m_connectedFrameCount(0)
    118         , m_elementFlags(0)
    119         , m_restyleFlags(0)
    120         , m_isElementRareData(false)
    121     { }
    122 
    123 private:
    124     OwnPtrWillBeMember<NodeListsNodeData> m_nodeLists;
    125     OwnPtrWillBeMember<NodeMutationObserverData> m_mutationObserverData;
    126 
    127     unsigned m_connectedFrameCount : ConnectedFrameCountBits;
    128     unsigned m_elementFlags : NumberOfElementFlags;
    129     unsigned m_restyleFlags : NumberOfDynamicRestyleFlags;
    130 protected:
    131     unsigned m_isElementRareData : 1;
    132 };
    133 
    134 } // namespace blink
    135 
    136 #endif // NodeRareData_h
    137