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/*
* Copyright (C) 2013, 2014 Apple 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "config.h"
#include "ElementData.h"
#include "Attr.h"
#include "Element.h"
#include "HTMLNames.h"
#include "ImmutableStyleProperties.h"
#include "MutableStyleProperties.h"
#include "StyleProperties.h"
#include "StylePropertiesInlines.h"
#include "XMLNames.h"
#include <wtf/ZippedRange.h>
namespace WebCore {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(ElementData);
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(ShareableElementData);
void ElementData::destroy()
{
if (auto* uniqueData = dynamicDowncast<UniqueElementData>(*this))
delete uniqueData;
else
delete uncheckedDowncast<ShareableElementData>(this);
}
ElementData::ElementData()
: m_arraySizeAndFlags(s_flagIsUnique)
{
}
ElementData::ElementData(unsigned arraySize)
: m_arraySizeAndFlags(arraySize << s_flagCount)
{
}
struct SameSizeAsElementData : public RefCounted<SameSizeAsElementData> {
unsigned bitfield;
void* refPtrs[3];
};
static_assert(sizeof(ElementData) == sizeof(SameSizeAsElementData), "element attribute data should stay small");
static size_t sizeForShareableElementDataWithAttributeCount(unsigned count)
{
return sizeof(ShareableElementData) + sizeof(Attribute) * count;
}
Ref<ShareableElementData> ShareableElementData::createWithAttributes(std::span<const Attribute> attributes)
{
void* slot = ShareableElementDataMalloc::malloc(sizeForShareableElementDataWithAttributeCount(attributes.size()));
return adoptRef(*new (NotNull, slot) ShareableElementData(attributes));
}
Ref<UniqueElementData> UniqueElementData::create()
{
return adoptRef(*new UniqueElementData);
}
ShareableElementData::ShareableElementData(std::span<const Attribute> attributes)
: ElementData(attributes.size())
{
for (auto [sourceAttribute, destinationAttribute] : zippedRange(attributes, this->attributes()))
new (NotNull, &destinationAttribute) Attribute(sourceAttribute);
}
ShareableElementData::~ShareableElementData()
{
for (auto& attribute : attributes())
attribute.~Attribute();
}
ShareableElementData::ShareableElementData(const UniqueElementData& other)
: ElementData(other, false)
{
ASSERT(!other.m_presentationalHintStyle);
if (other.m_inlineStyle) {
ASSERT(!other.m_inlineStyle->hasCSSOMWrapper());
m_inlineStyle = other.m_inlineStyle->immutableCopyIfNeeded();
}
for (auto [sourceAttribute, destinationAttribute] : zippedRange(other.m_attributeVector.span(), attributes()))
new (NotNull, &destinationAttribute) Attribute(sourceAttribute);
}
inline uint32_t ElementData::arraySizeAndFlagsFromOther(const ElementData& other, bool isUnique)
{
if (isUnique) {
// Set isUnique and ignore arraySize.
return (other.m_arraySizeAndFlags | s_flagIsUnique) & s_flagsMask;
}
// Clear isUnique and set arraySize.
return (other.m_arraySizeAndFlags & (s_flagsMask & ~s_flagIsUnique)) | other.length() << s_flagCount;
}
ElementData::ElementData(const ElementData& other, bool isUnique)
: m_arraySizeAndFlags(ElementData::arraySizeAndFlagsFromOther(other, isUnique))
, m_classNames(other.m_classNames)
, m_idForStyleResolution(other.m_idForStyleResolution)
{
// NOTE: The inline style is copied by the subclass copy constructor since we don't know what to do with it here.
}
UniqueElementData::UniqueElementData()
{
}
UniqueElementData::UniqueElementData(const UniqueElementData& other)
: ElementData(other, true)
, m_presentationalHintStyle(other.m_presentationalHintStyle)
, m_attributeVector(other.m_attributeVector)
{
if (other.m_inlineStyle)
m_inlineStyle = other.m_inlineStyle->mutableCopy();
}
UniqueElementData::UniqueElementData(const ShareableElementData& other)
: ElementData(other, true)
, m_attributeVector(other.attributes())
{
// An ShareableElementData should never have a mutable inline StyleProperties attached.
ASSERT(!other.m_inlineStyle || !other.m_inlineStyle->isMutable());
m_inlineStyle = other.m_inlineStyle;
}
Ref<UniqueElementData> ElementData::makeUniqueCopy() const
{
if (auto* uniqueData = dynamicDowncast<const UniqueElementData>(*this))
return adoptRef(*new UniqueElementData(*uniqueData));
return adoptRef(*new UniqueElementData(downcast<const ShareableElementData>(*this)));
}
Ref<ShareableElementData> UniqueElementData::makeShareableCopy() const
{
void* slot = ShareableElementDataMalloc::malloc(sizeForShareableElementDataWithAttributeCount(m_attributeVector.size()));
return adoptRef(*new (NotNull, slot) ShareableElementData(*this));
}
bool ElementData::isEquivalent(const ElementData* other) const
{
if (!other)
return isEmpty();
if (length() != other->length())
return false;
for (auto& attribute : attributes()) {
auto* otherAttr = other->findAttributeByName(attribute.name());
if (!otherAttr || attribute.value() != otherAttr->value())
return false;
}
return true;
}
Attribute* UniqueElementData::findAttributeByName(const QualifiedName& name)
{
for (auto& attribute : m_attributeVector) {
if (attribute.name().matches(name))
return &attribute;
}
return nullptr;
}
}
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