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/*
* Copyright (C) 2013 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/element_data.h"
#include "third_party/blink/renderer/core/css/css_property_value_set.h"
#include "third_party/blink/renderer/core/dom/qualified_name.h"
#include "third_party/blink/renderer/platform/wtf/size_assertions.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
struct SameSizeAsElementData final
: public GarbageCollected<SameSizeAsElementData> {
unsigned bitfield;
Member<void*> inline_style_;
Member<void*> presentation_attribute_style_;
SpaceSplitString class_names_;
void* pointers[1];
};
ASSERT_SIZE(ElementData, SameSizeAsElementData);
static AdditionalBytes AdditionalBytesForShareableElementDataWithAttributeCount(
unsigned count) {
return AdditionalBytes(sizeof(Attribute) * count);
}
ElementData::ElementData()
: bit_field_(IsUniqueFlag::encode(true) | ArraySize::encode(0) |
PresentationAttributeStyleIsDirty::encode(false) |
StyleAttributeIsDirty::encode(false) |
SvgAttributesAreDirty::encode(false)) {}
ElementData::ElementData(unsigned array_size)
: bit_field_(IsUniqueFlag::encode(false) | ArraySize::encode(array_size) |
PresentationAttributeStyleIsDirty::encode(false) |
StyleAttributeIsDirty::encode(false) |
SvgAttributesAreDirty::encode(false)) {}
ElementData::ElementData(const ElementData& other, bool is_unique)
: bit_field_(
IsUniqueFlag::encode(is_unique) |
ArraySize::encode(is_unique ? 0 : other.Attributes().size()) |
PresentationAttributeStyleIsDirty::encode(
other.bit_field_.get<PresentationAttributeStyleIsDirty>()) |
StyleAttributeIsDirty::encode(
other.bit_field_.get<StyleAttributeIsDirty>()) |
SvgAttributesAreDirty::encode(
other.bit_field_.get<SvgAttributesAreDirty>())),
class_names_(other.class_names_),
id_for_style_resolution_(other.id_for_style_resolution_) {
// NOTE: The inline and presentation attribute styles are copied by the
// subclass copy constructor since we don't know what to do with it here.
}
void ElementData::FinalizeGarbageCollectedObject() {
if (auto* unique_element_data = DynamicTo<UniqueElementData>(this))
unique_element_data->~UniqueElementData();
else
To<ShareableElementData>(this)->~ShareableElementData();
}
UniqueElementData* ElementData::MakeUniqueCopy() const {
if (auto* unique_element_data = DynamicTo<UniqueElementData>(this))
return MakeGarbageCollected<UniqueElementData>(*unique_element_data);
return MakeGarbageCollected<UniqueElementData>(
To<ShareableElementData>(*this));
}
bool ElementData::IsEquivalent(const ElementData* other) const {
AttributeCollection attributes = Attributes();
if (!other)
return attributes.IsEmpty();
AttributeCollection other_attributes = other->Attributes();
if (attributes.size() != other_attributes.size())
return false;
for (const Attribute& attribute : attributes) {
const Attribute* other_attr = other_attributes.Find(attribute.GetName());
if (!other_attr || attribute.Value() != other_attr->Value())
return false;
}
return true;
}
void ElementData::Trace(Visitor* visitor) const {
if (bit_field_.get_concurrently<IsUniqueFlag>()) {
static_cast<const UniqueElementData*>(this)->TraceAfterDispatch(visitor);
} else {
static_cast<const ShareableElementData*>(this)->TraceAfterDispatch(visitor);
}
}
void ElementData::TraceAfterDispatch(blink::Visitor* visitor) const {
visitor->Trace(inline_style_);
visitor->Trace(presentation_attribute_style_);
visitor->Trace(class_names_);
}
ShareableElementData::ShareableElementData(
const Vector<Attribute, kAttributePrealloc>& attributes)
: ElementData(attributes.size()) {
for (size_t i = 0; i < attributes.size(); ++i) {
new (&AttributesSpan()[i]) Attribute(attributes[i]);
}
}
ShareableElementData::~ShareableElementData() {
for (auto& attribute : AttributesSpan()) {
attribute.~Attribute();
}
}
ShareableElementData::ShareableElementData(const UniqueElementData& other)
: ElementData(other, false) {
if (other.inline_style_) {
inline_style_ = other.inline_style_->ImmutableCopyIfNeeded();
}
if (other.presentation_attribute_style_) {
presentation_attribute_style_ =
other.presentation_attribute_style_->ImmutableCopyIfNeeded();
}
for (unsigned i = 0; i < other.attribute_vector_.size(); ++i) {
new (&AttributesSpan()[i]) Attribute(other.attribute_vector_.at(i));
}
}
ShareableElementData* ShareableElementData::CreateWithAttributes(
const Vector<Attribute, kAttributePrealloc>& attributes) {
return MakeGarbageCollected<ShareableElementData>(
AdditionalBytesForShareableElementDataWithAttributeCount(
attributes.size()),
attributes);
}
UniqueElementData::UniqueElementData() = default;
UniqueElementData::UniqueElementData(const UniqueElementData& other)
: ElementData(other, true), attribute_vector_(other.attribute_vector_) {
inline_style_ =
other.inline_style_ ? other.inline_style_->MutableCopy() : nullptr;
presentation_attribute_style_ =
other.presentation_attribute_style_
? other.presentation_attribute_style_->MutableCopy()
: nullptr;
}
UniqueElementData::UniqueElementData(const ShareableElementData& other)
: ElementData(other, true) {
// An ShareableElementData should never have a mutable inline
// CSSPropertyValueSet attached. Same for presentation attribute style.
DCHECK(!other.inline_style_ || !other.inline_style_->IsMutable());
inline_style_ = other.inline_style_;
DCHECK(!other.presentation_attribute_style_ ||
!other.presentation_attribute_style_->IsMutable());
presentation_attribute_style_ = other.presentation_attribute_style_;
attribute_vector_.reserve(other.Attributes().size());
for (auto& attribute : other.AttributesSpan()) {
attribute_vector_.UncheckedAppend(attribute);
}
}
ShareableElementData* UniqueElementData::MakeShareableCopy() const {
return MakeGarbageCollected<ShareableElementData>(
AdditionalBytesForShareableElementDataWithAttributeCount(
attribute_vector_.size()),
*this);
}
void UniqueElementData::TraceAfterDispatch(blink::Visitor* visitor) const {
ElementData::TraceAfterDispatch(visitor);
}
} // namespace blink
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