1/* 2 * Copyright (C) 2013 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include "config.h" 32#include "core/dom/ElementData.h" 33 34#include "core/css/StylePropertySet.h" 35#include "core/dom/QualifiedName.h" 36#include "wtf/Vector.h" 37 38namespace blink { 39 40struct SameSizeAsElementData : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsElementData> { 41 unsigned bitfield; 42 void* pointers[3]; 43}; 44 45COMPILE_ASSERT(sizeof(ElementData) == sizeof(SameSizeAsElementData), element_attribute_data_should_stay_small); 46 47static size_t sizeForShareableElementDataWithAttributeCount(unsigned count) 48{ 49 return sizeof(ShareableElementData) + sizeof(Attribute) * count; 50} 51 52ElementData::ElementData() 53 : m_isUnique(true) 54 , m_arraySize(0) 55 , m_presentationAttributeStyleIsDirty(false) 56 , m_styleAttributeIsDirty(false) 57 , m_animatedSVGAttributesAreDirty(false) 58{ 59} 60 61ElementData::ElementData(unsigned arraySize) 62 : m_isUnique(false) 63 , m_arraySize(arraySize) 64 , m_presentationAttributeStyleIsDirty(false) 65 , m_styleAttributeIsDirty(false) 66 , m_animatedSVGAttributesAreDirty(false) 67{ 68} 69 70ElementData::ElementData(const ElementData& other, bool isUnique) 71 : m_isUnique(isUnique) 72 , m_arraySize(isUnique ? 0 : other.attributes().size()) 73 , m_presentationAttributeStyleIsDirty(other.m_presentationAttributeStyleIsDirty) 74 , m_styleAttributeIsDirty(other.m_styleAttributeIsDirty) 75 , m_animatedSVGAttributesAreDirty(other.m_animatedSVGAttributesAreDirty) 76 , m_classNames(other.m_classNames) 77 , m_idForStyleResolution(other.m_idForStyleResolution) 78{ 79 // NOTE: The inline style is copied by the subclass copy constructor since we don't know what to do with it here. 80} 81 82#if ENABLE(OILPAN) 83void ElementData::finalizeGarbageCollectedObject() 84{ 85 if (m_isUnique) 86 toUniqueElementData(this)->~UniqueElementData(); 87 else 88 toShareableElementData(this)->~ShareableElementData(); 89} 90#else 91void ElementData::destroy() 92{ 93 if (m_isUnique) 94 delete toUniqueElementData(this); 95 else 96 delete toShareableElementData(this); 97} 98#endif 99 100PassRefPtrWillBeRawPtr<UniqueElementData> ElementData::makeUniqueCopy() const 101{ 102 if (isUnique()) 103 return adoptRefWillBeNoop(new UniqueElementData(toUniqueElementData(*this))); 104 return adoptRefWillBeNoop(new UniqueElementData(toShareableElementData(*this))); 105} 106 107bool ElementData::isEquivalent(const ElementData* other) const 108{ 109 AttributeCollection attributes = this->attributes(); 110 if (!other) 111 return attributes.isEmpty(); 112 113 AttributeCollection otherAttributes = other->attributes(); 114 if (attributes.size() != otherAttributes.size()) 115 return false; 116 117 AttributeCollection::iterator end = attributes.end(); 118 for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) { 119 const Attribute* otherAttr = otherAttributes.find(it->name()); 120 if (!otherAttr || it->value() != otherAttr->value()) 121 return false; 122 } 123 return true; 124} 125 126void ElementData::trace(Visitor* visitor) 127{ 128 if (m_isUnique) 129 toUniqueElementData(this)->traceAfterDispatch(visitor); 130 else 131 toShareableElementData(this)->traceAfterDispatch(visitor); 132} 133 134void ElementData::traceAfterDispatch(Visitor* visitor) 135{ 136 visitor->trace(m_inlineStyle); 137} 138 139ShareableElementData::ShareableElementData(const Vector<Attribute>& attributes) 140 : ElementData(attributes.size()) 141{ 142 for (unsigned i = 0; i < m_arraySize; ++i) 143 new (&m_attributeArray[i]) Attribute(attributes[i]); 144} 145 146ShareableElementData::~ShareableElementData() 147{ 148 for (unsigned i = 0; i < m_arraySize; ++i) 149 m_attributeArray[i].~Attribute(); 150} 151 152ShareableElementData::ShareableElementData(const UniqueElementData& other) 153 : ElementData(other, false) 154{ 155 ASSERT(!other.m_presentationAttributeStyle); 156 157 if (other.m_inlineStyle) { 158 m_inlineStyle = other.m_inlineStyle->immutableCopyIfNeeded(); 159 } 160 161 for (unsigned i = 0; i < m_arraySize; ++i) 162 new (&m_attributeArray[i]) Attribute(other.m_attributeVector.at(i)); 163} 164 165PassRefPtrWillBeRawPtr<ShareableElementData> ShareableElementData::createWithAttributes(const Vector<Attribute>& attributes) 166{ 167#if ENABLE(OILPAN) 168 void* slot = Heap::allocate<ElementData>(sizeForShareableElementDataWithAttributeCount(attributes.size())); 169#else 170 void* slot = WTF::fastMalloc(sizeForShareableElementDataWithAttributeCount(attributes.size())); 171#endif 172 return adoptRefWillBeNoop(new (slot) ShareableElementData(attributes)); 173} 174 175UniqueElementData::UniqueElementData() 176{ 177} 178 179UniqueElementData::UniqueElementData(const UniqueElementData& other) 180 : ElementData(other, true) 181 , m_presentationAttributeStyle(other.m_presentationAttributeStyle) 182 , m_attributeVector(other.m_attributeVector) 183{ 184 m_inlineStyle = other.m_inlineStyle ? other.m_inlineStyle->mutableCopy() : nullptr; 185} 186 187UniqueElementData::UniqueElementData(const ShareableElementData& other) 188 : ElementData(other, true) 189{ 190 // An ShareableElementData should never have a mutable inline StylePropertySet attached. 191 ASSERT(!other.m_inlineStyle || !other.m_inlineStyle->isMutable()); 192 m_inlineStyle = other.m_inlineStyle; 193 194 unsigned length = other.attributes().size(); 195 m_attributeVector.reserveCapacity(length); 196 for (unsigned i = 0; i < length; ++i) 197 m_attributeVector.uncheckedAppend(other.m_attributeArray[i]); 198} 199 200PassRefPtrWillBeRawPtr<UniqueElementData> UniqueElementData::create() 201{ 202 return adoptRefWillBeNoop(new UniqueElementData); 203} 204 205PassRefPtrWillBeRawPtr<ShareableElementData> UniqueElementData::makeShareableCopy() const 206{ 207#if ENABLE(OILPAN) 208 void* slot = Heap::allocate<ElementData>(sizeForShareableElementDataWithAttributeCount(m_attributeVector.size())); 209#else 210 void* slot = WTF::fastMalloc(sizeForShareableElementDataWithAttributeCount(m_attributeVector.size())); 211#endif 212 return adoptRefWillBeNoop(new (slot) ShareableElementData(*this)); 213} 214 215void UniqueElementData::traceAfterDispatch(Visitor* visitor) 216{ 217 visitor->trace(m_presentationAttributeStyle); 218 ElementData::traceAfterDispatch(visitor); 219} 220 221} // namespace blink 222