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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /dom/base/nsMappedAttributes.cpp | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/base/nsMappedAttributes.cpp')
-rw-r--r-- | dom/base/nsMappedAttributes.cpp | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/dom/base/nsMappedAttributes.cpp b/dom/base/nsMappedAttributes.cpp new file mode 100644 index 0000000000..43322f4d9a --- /dev/null +++ b/dom/base/nsMappedAttributes.cpp @@ -0,0 +1,264 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * A unique per-element set of attributes that is used as an + * nsIStyleRule; used to implement presentational attributes. + */ + +#include "nsMappedAttributes.h" +#include "mozilla/Assertions.h" +#include "nsHTMLStyleSheet.h" +#include "mozilla/DeclarationBlock.h" +#include "mozilla/HashFunctions.h" +#include "mozilla/MappedDeclarations.h" +#include "mozilla/MemoryReporting.h" + +using namespace mozilla; + +bool nsMappedAttributes::sShuttingDown = false; +nsTArray<void*>* nsMappedAttributes::sCachedMappedAttributeAllocations = + nullptr; + +void nsMappedAttributes::Shutdown() { + sShuttingDown = true; + if (sCachedMappedAttributeAllocations) { + for (uint32_t i = 0; i < sCachedMappedAttributeAllocations->Length(); ++i) { + void* cachedValue = (*sCachedMappedAttributeAllocations)[i]; + ::operator delete(cachedValue); + } + } + + delete sCachedMappedAttributeAllocations; + sCachedMappedAttributeAllocations = nullptr; +} + +nsMappedAttributes::nsMappedAttributes(nsHTMLStyleSheet* aSheet, + nsMapRuleToAttributesFunc aMapRuleFunc) + : mAttrCount(0), + mSheet(aSheet), + mRuleMapper(aMapRuleFunc), + mServoStyle(nullptr) { + MOZ_ASSERT(mRefCnt == 0); // Ensure caching works as expected. +} + +nsMappedAttributes::nsMappedAttributes(const nsMappedAttributes& aCopy) + : mAttrCount(aCopy.mAttrCount), + mSheet(aCopy.mSheet), + mRuleMapper(aCopy.mRuleMapper), + // This is only called by ::Clone, which is used to create independent + // nsMappedAttributes objects which should not share a DeclarationBlock + mServoStyle(nullptr) { + MOZ_ASSERT(mBufferSize >= aCopy.mAttrCount, "can't fit attributes"); + MOZ_ASSERT(mRefCnt == 0); // Ensure caching works as expected. + + uint32_t i = 0; + for (const InternalAttr& attr : aCopy.Attrs()) { + new (&mBuffer[i++]) InternalAttr(attr); + } +} + +nsMappedAttributes::~nsMappedAttributes() { + if (mSheet) { + mSheet->DropMappedAttributes(this); + } + + for (InternalAttr& attr : Attrs()) { + attr.~InternalAttr(); + } +} + +nsMappedAttributes* nsMappedAttributes::Clone(bool aWillAddAttr) { + uint32_t extra = aWillAddAttr ? 1 : 0; + + // This will call the overridden operator new + return new (mAttrCount + extra) nsMappedAttributes(*this); +} + +void* nsMappedAttributes::operator new(size_t aSize, + uint32_t aAttrCount) noexcept(true) { + size_t size = aSize + aAttrCount * sizeof(InternalAttr); + + if (sCachedMappedAttributeAllocations) { + void* cached = sCachedMappedAttributeAllocations->SafeElementAt(aAttrCount); + if (cached) { + (*sCachedMappedAttributeAllocations)[aAttrCount] = nullptr; + return cached; + } + } + + void* newAttrs = ::operator new(size); + +#ifdef DEBUG + static_cast<nsMappedAttributes*>(newAttrs)->mBufferSize = aAttrCount; +#endif + return newAttrs; +} + +void nsMappedAttributes::LastRelease() { + if (!sShuttingDown) { + if (!sCachedMappedAttributeAllocations) { + sCachedMappedAttributeAllocations = new nsTArray<void*>(); + } + + // Ensure the cache array is at least mAttrCount + 1 long and + // that each item is either null or pointing to a cached item. + // The size of the array is capped because mapped attributes are defined + // statically in element implementations. + sCachedMappedAttributeAllocations->SetCapacity(mAttrCount + 1); + for (uint32_t i = sCachedMappedAttributeAllocations->Length(); + i < (uint32_t(mAttrCount) + 1); ++i) { + sCachedMappedAttributeAllocations->AppendElement(nullptr); + } + + if (!(*sCachedMappedAttributeAllocations)[mAttrCount]) { + void* memoryToCache = this; + this->~nsMappedAttributes(); + (*sCachedMappedAttributeAllocations)[mAttrCount] = memoryToCache; + return; + } + } + + delete this; +} + +void nsMappedAttributes::SetAndSwapAttr(nsAtom* aAttrName, nsAttrValue& aValue, + bool* aValueWasSet) { + MOZ_ASSERT(aAttrName, "null name"); + *aValueWasSet = false; + uint32_t i; + for (i = 0; i < mAttrCount && !mBuffer[i].mName.IsSmaller(aAttrName); ++i) { + if (mBuffer[i].mName.Equals(aAttrName)) { + mBuffer[i].mValue.SwapValueWith(aValue); + *aValueWasSet = true; + return; + } + } + + MOZ_ASSERT(mBufferSize >= mAttrCount + 1, "can't fit attributes"); + + if (mAttrCount != i) { + memmove(&mBuffer[i + 1], &mBuffer[i], + (mAttrCount - i) * sizeof(InternalAttr)); + } + + new (&mBuffer[i].mName) nsAttrName(aAttrName); + new (&mBuffer[i].mValue) nsAttrValue(); + mBuffer[i].mValue.SwapValueWith(aValue); + ++mAttrCount; +} + +const nsAttrValue* nsMappedAttributes::GetAttr(const nsAtom* aAttrName) const { + MOZ_ASSERT(aAttrName, "null name"); + for (const InternalAttr& attr : Attrs()) { + if (attr.mName.Equals(aAttrName)) { + return &attr.mValue; + } + } + return nullptr; +} + +const nsAttrValue* nsMappedAttributes::GetAttr( + const nsAString& aAttrName) const { + for (const InternalAttr& attr : Attrs()) { + if (attr.mName.Atom()->Equals(aAttrName)) { + return &attr.mValue; + } + } + return nullptr; +} + +bool nsMappedAttributes::Equals(const nsMappedAttributes* aOther) const { + if (this == aOther) { + return true; + } + + if (mRuleMapper != aOther->mRuleMapper || mAttrCount != aOther->mAttrCount) { + return false; + } + + uint32_t i; + for (i = 0; i < mAttrCount; ++i) { + if (!mBuffer[i].mName.Equals(aOther->mBuffer[i].mName) || + !mBuffer[i].mValue.Equals(aOther->mBuffer[i].mValue)) { + return false; + } + } + + return true; +} + +PLDHashNumber nsMappedAttributes::HashValue() const { + PLDHashNumber hash = HashGeneric(mRuleMapper); + for (const InternalAttr& attr : Attrs()) { + hash = AddToHash(hash, attr.mName.HashValue(), attr.mValue.HashValue()); + } + return hash; +} + +void nsMappedAttributes::SetStyleSheet(nsHTMLStyleSheet* aSheet) { + MOZ_ASSERT(!mSheet, + "Should either drop the sheet reference manually, " + "or drop the mapped attributes"); + mSheet = aSheet; // not ref counted +} + +void nsMappedAttributes::RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue) { + mBuffer[aPos].mValue.SwapValueWith(aValue); + mBuffer[aPos].~InternalAttr(); + memmove(&mBuffer[aPos], &mBuffer[aPos + 1], + (mAttrCount - aPos - 1) * sizeof(InternalAttr)); + mAttrCount--; +} + +const nsAttrName* nsMappedAttributes::GetExistingAttrNameFromQName( + const nsAString& aName) const { + for (const InternalAttr& attr : Attrs()) { + if (attr.mName.IsAtom()) { + if (attr.mName.Atom()->Equals(aName)) { + return &attr.mName; + } + } else { + if (attr.mName.NodeInfo()->QualifiedNameEquals(aName)) { + return &attr.mName; + } + } + } + + return nullptr; +} + +int32_t nsMappedAttributes::IndexOfAttr(const nsAtom* aLocalName) const { + for (uint32_t i = 0; i < mAttrCount; ++i) { + if (mBuffer[i].mName.Equals(aLocalName)) { + return i; + } + } + return -1; +} + +size_t nsMappedAttributes::SizeOfIncludingThis( + MallocSizeOf aMallocSizeOf) const { + MOZ_ASSERT(mBufferSize >= mAttrCount, "can't fit attributes"); + + size_t n = aMallocSizeOf(this); + for (const InternalAttr& attr : Attrs()) { + n += attr.mValue.SizeOfExcludingThis(aMallocSizeOf); + } + return n; +} + +void nsMappedAttributes::LazilyResolveServoDeclaration(dom::Document* aDoc) { + MOZ_ASSERT(!mServoStyle, + "LazilyResolveServoDeclaration should not be called if " + "mServoStyle is already set"); + if (mRuleMapper) { + MappedDeclarations declarations( + aDoc, Servo_DeclarationBlock_CreateEmpty().Consume()); + (*mRuleMapper)(this, declarations); + mServoStyle = declarations.TakeDeclarationBlock(); + } +} |