зеркало из https://github.com/mozilla/gecko-dev.git
284 строки
8.2 KiB
C++
284 строки
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* A unique per-element set of attributes that is used as an
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* nsIStyleRule; used to implement presentational attributes.
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*/
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#include "nsMappedAttributes.h"
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#include "mozilla/Assertions.h"
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#include "nsHTMLStyleSheet.h"
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#include "mozilla/DeclarationBlock.h"
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#include "mozilla/HashFunctions.h"
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#include "mozilla/MappedDeclarations.h"
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#include "mozilla/MemoryReporting.h"
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using namespace mozilla;
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bool nsMappedAttributes::sShuttingDown = false;
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nsTArray<void*>* nsMappedAttributes::sCachedMappedAttributeAllocations =
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nullptr;
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void nsMappedAttributes::Shutdown() {
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sShuttingDown = true;
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if (sCachedMappedAttributeAllocations) {
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for (uint32_t i = 0; i < sCachedMappedAttributeAllocations->Length(); ++i) {
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void* cachedValue = (*sCachedMappedAttributeAllocations)[i];
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::operator delete(cachedValue);
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}
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}
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delete sCachedMappedAttributeAllocations;
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sCachedMappedAttributeAllocations = nullptr;
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}
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nsMappedAttributes::nsMappedAttributes(nsHTMLStyleSheet* aSheet,
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nsMapRuleToAttributesFunc aMapRuleFunc)
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: mAttrCount(0),
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mSheet(aSheet),
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mRuleMapper(aMapRuleFunc),
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mServoStyle(nullptr) {
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MOZ_ASSERT(mRefCnt == 0); // Ensure caching works as expected.
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}
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nsMappedAttributes::nsMappedAttributes(const nsMappedAttributes& aCopy)
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: mAttrCount(aCopy.mAttrCount),
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mSheet(aCopy.mSheet),
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mRuleMapper(aCopy.mRuleMapper),
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// This is only called by ::Clone, which is used to create independent
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// nsMappedAttributes objects which should not share a DeclarationBlock
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mServoStyle(nullptr) {
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MOZ_ASSERT(mBufferSize >= aCopy.mAttrCount, "can't fit attributes");
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MOZ_ASSERT(mRefCnt == 0); // Ensure caching works as expected.
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uint32_t i;
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for (i = 0; i < mAttrCount; ++i) {
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new (&Attrs()[i]) InternalAttr(aCopy.Attrs()[i]);
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}
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}
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nsMappedAttributes::~nsMappedAttributes() {
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if (mSheet) {
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mSheet->DropMappedAttributes(this);
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}
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uint32_t i;
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for (i = 0; i < mAttrCount; ++i) {
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Attrs()[i].~InternalAttr();
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}
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}
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nsMappedAttributes* nsMappedAttributes::Clone(bool aWillAddAttr) {
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uint32_t extra = aWillAddAttr ? 1 : 0;
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// This will call the overridden operator new
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return new (mAttrCount + extra) nsMappedAttributes(*this);
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}
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void* nsMappedAttributes::operator new(size_t aSize,
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uint32_t aAttrCount) noexcept(true) {
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size_t size = aSize + aAttrCount * sizeof(InternalAttr);
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// aSize will include the mAttrs buffer so subtract that.
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// We don't want to under-allocate, however, so do not subtract
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// if we have zero attributes. The zero attribute case only happens
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// for <body>'s mapped attributes
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if (aAttrCount != 0) {
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size -= sizeof(void* [1]);
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}
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if (sCachedMappedAttributeAllocations) {
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void* cached = sCachedMappedAttributeAllocations->SafeElementAt(aAttrCount);
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if (cached) {
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(*sCachedMappedAttributeAllocations)[aAttrCount] = nullptr;
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return cached;
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}
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}
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void* newAttrs = ::operator new(size);
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#ifdef DEBUG
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static_cast<nsMappedAttributes*>(newAttrs)->mBufferSize = aAttrCount;
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#endif
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return newAttrs;
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}
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void nsMappedAttributes::LastRelease() {
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if (!sShuttingDown) {
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if (!sCachedMappedAttributeAllocations) {
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sCachedMappedAttributeAllocations = new nsTArray<void*>();
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}
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// Ensure the cache array is at least mAttrCount + 1 long and
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// that each item is either null or pointing to a cached item.
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// The size of the array is capped because mapped attributes are defined
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// statically in element implementations.
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sCachedMappedAttributeAllocations->SetCapacity(mAttrCount + 1);
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for (uint32_t i = sCachedMappedAttributeAllocations->Length();
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i < (uint32_t(mAttrCount) + 1); ++i) {
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sCachedMappedAttributeAllocations->AppendElement(nullptr);
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}
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if (!(*sCachedMappedAttributeAllocations)[mAttrCount]) {
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void* memoryToCache = this;
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this->~nsMappedAttributes();
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(*sCachedMappedAttributeAllocations)[mAttrCount] = memoryToCache;
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return;
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}
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}
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delete this;
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}
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void nsMappedAttributes::SetAndSwapAttr(nsAtom* aAttrName, nsAttrValue& aValue,
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bool* aValueWasSet) {
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MOZ_ASSERT(aAttrName, "null name");
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*aValueWasSet = false;
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uint32_t i;
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for (i = 0; i < mAttrCount && !Attrs()[i].mName.IsSmaller(aAttrName); ++i) {
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if (Attrs()[i].mName.Equals(aAttrName)) {
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Attrs()[i].mValue.SwapValueWith(aValue);
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*aValueWasSet = true;
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return;
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}
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}
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MOZ_ASSERT(mBufferSize >= mAttrCount + 1, "can't fit attributes");
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if (mAttrCount != i) {
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memmove(&Attrs()[i + 1], &Attrs()[i],
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(mAttrCount - i) * sizeof(InternalAttr));
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}
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new (&Attrs()[i].mName) nsAttrName(aAttrName);
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new (&Attrs()[i].mValue) nsAttrValue();
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Attrs()[i].mValue.SwapValueWith(aValue);
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++mAttrCount;
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}
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const nsAttrValue* nsMappedAttributes::GetAttr(const nsAtom* aAttrName) const {
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MOZ_ASSERT(aAttrName, "null name");
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for (uint32_t i = 0; i < mAttrCount; ++i) {
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if (Attrs()[i].mName.Equals(aAttrName)) {
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return &Attrs()[i].mValue;
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}
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}
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return nullptr;
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}
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const nsAttrValue* nsMappedAttributes::GetAttr(
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const nsAString& aAttrName) const {
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for (uint32_t i = 0; i < mAttrCount; ++i) {
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if (Attrs()[i].mName.Atom()->Equals(aAttrName)) {
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return &Attrs()[i].mValue;
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}
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}
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return nullptr;
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}
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bool nsMappedAttributes::Equals(const nsMappedAttributes* aOther) const {
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if (this == aOther) {
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return true;
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}
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if (mRuleMapper != aOther->mRuleMapper || mAttrCount != aOther->mAttrCount) {
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return false;
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}
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uint32_t i;
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for (i = 0; i < mAttrCount; ++i) {
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if (!Attrs()[i].mName.Equals(aOther->Attrs()[i].mName) ||
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!Attrs()[i].mValue.Equals(aOther->Attrs()[i].mValue)) {
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return false;
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}
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}
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return true;
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}
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PLDHashNumber nsMappedAttributes::HashValue() const {
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PLDHashNumber hash = HashGeneric(mRuleMapper);
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uint32_t i;
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for (i = 0; i < mAttrCount; ++i) {
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hash = AddToHash(hash, Attrs()[i].mName.HashValue(),
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Attrs()[i].mValue.HashValue());
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}
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return hash;
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}
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void nsMappedAttributes::SetStyleSheet(nsHTMLStyleSheet* aSheet) {
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MOZ_ASSERT(!mSheet,
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"Should either drop the sheet reference manually, "
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"or drop the mapped attributes");
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mSheet = aSheet; // not ref counted
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}
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void nsMappedAttributes::RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue) {
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Attrs()[aPos].mValue.SwapValueWith(aValue);
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Attrs()[aPos].~InternalAttr();
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memmove(&Attrs()[aPos], &Attrs()[aPos + 1],
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(mAttrCount - aPos - 1) * sizeof(InternalAttr));
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mAttrCount--;
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}
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const nsAttrName* nsMappedAttributes::GetExistingAttrNameFromQName(
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const nsAString& aName) const {
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uint32_t i;
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for (i = 0; i < mAttrCount; ++i) {
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if (Attrs()[i].mName.IsAtom()) {
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if (Attrs()[i].mName.Atom()->Equals(aName)) {
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return &Attrs()[i].mName;
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}
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} else {
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if (Attrs()[i].mName.NodeInfo()->QualifiedNameEquals(aName)) {
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return &Attrs()[i].mName;
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}
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}
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}
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return nullptr;
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}
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int32_t nsMappedAttributes::IndexOfAttr(const nsAtom* aLocalName) const {
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uint32_t i;
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for (i = 0; i < mAttrCount; ++i) {
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if (Attrs()[i].mName.Equals(aLocalName)) {
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return i;
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}
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}
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return -1;
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}
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size_t nsMappedAttributes::SizeOfIncludingThis(
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MallocSizeOf aMallocSizeOf) const {
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MOZ_ASSERT(mBufferSize >= mAttrCount, "can't fit attributes");
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size_t n = aMallocSizeOf(this);
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for (uint16_t i = 0; i < mAttrCount; ++i) {
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n += Attrs()[i].mValue.SizeOfExcludingThis(aMallocSizeOf);
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}
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return n;
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}
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void nsMappedAttributes::LazilyResolveServoDeclaration(dom::Document* aDoc) {
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MOZ_ASSERT(!mServoStyle,
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"LazilyResolveServoDeclaration should not be called if "
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"mServoStyle is already set");
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if (mRuleMapper) {
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MappedDeclarations declarations(
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aDoc, Servo_DeclarationBlock_CreateEmpty().Consume());
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(*mRuleMapper)(this, declarations);
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mServoStyle = declarations.TakeDeclarationBlock();
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}
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}
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