forked from mirrors/gecko-dev
fcb6f227f2
That is, drop the reference to the sheet pointer. GetModifiableMapped doesn't ever return anything that's on the hash. But trying to DropMappedAttributes it will remove not that instance, but any other instance that's already in the hash and matches it. ThisDropSheetReference is always done in MakeMappedUnique if relevant. On the original test-case it was about the -moz-user-modify property that contenteditable maps, but it reproduces with any mapped attribute like hidden, so I used that for WPT. Differential Revision: https://phabricator.services.mozilla.com/D74498
283 lines
8.2 KiB
C++
283 lines
8.2 KiB
C++
/* -*- 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;
|
|
for (i = 0; i < mAttrCount; ++i) {
|
|
new (&Attrs()[i]) InternalAttr(aCopy.Attrs()[i]);
|
|
}
|
|
}
|
|
|
|
nsMappedAttributes::~nsMappedAttributes() {
|
|
if (mSheet) {
|
|
mSheet->DropMappedAttributes(this);
|
|
}
|
|
|
|
uint32_t i;
|
|
for (i = 0; i < mAttrCount; ++i) {
|
|
Attrs()[i].~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);
|
|
|
|
// aSize will include the mAttrs buffer so subtract that.
|
|
// We don't want to under-allocate, however, so do not subtract
|
|
// if we have zero attributes. The zero attribute case only happens
|
|
// for <body>'s mapped attributes
|
|
if (aAttrCount != 0) {
|
|
size -= sizeof(void* [1]);
|
|
}
|
|
|
|
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 && !Attrs()[i].mName.IsSmaller(aAttrName); ++i) {
|
|
if (Attrs()[i].mName.Equals(aAttrName)) {
|
|
Attrs()[i].mValue.SwapValueWith(aValue);
|
|
*aValueWasSet = true;
|
|
return;
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(mBufferSize >= mAttrCount + 1, "can't fit attributes");
|
|
|
|
if (mAttrCount != i) {
|
|
memmove(&Attrs()[i + 1], &Attrs()[i],
|
|
(mAttrCount - i) * sizeof(InternalAttr));
|
|
}
|
|
|
|
new (&Attrs()[i].mName) nsAttrName(aAttrName);
|
|
new (&Attrs()[i].mValue) nsAttrValue();
|
|
Attrs()[i].mValue.SwapValueWith(aValue);
|
|
++mAttrCount;
|
|
}
|
|
|
|
const nsAttrValue* nsMappedAttributes::GetAttr(const nsAtom* aAttrName) const {
|
|
MOZ_ASSERT(aAttrName, "null name");
|
|
|
|
for (uint32_t i = 0; i < mAttrCount; ++i) {
|
|
if (Attrs()[i].mName.Equals(aAttrName)) {
|
|
return &Attrs()[i].mValue;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
const nsAttrValue* nsMappedAttributes::GetAttr(
|
|
const nsAString& aAttrName) const {
|
|
for (uint32_t i = 0; i < mAttrCount; ++i) {
|
|
if (Attrs()[i].mName.Atom()->Equals(aAttrName)) {
|
|
return &Attrs()[i].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 (!Attrs()[i].mName.Equals(aOther->Attrs()[i].mName) ||
|
|
!Attrs()[i].mValue.Equals(aOther->Attrs()[i].mValue)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
PLDHashNumber nsMappedAttributes::HashValue() const {
|
|
PLDHashNumber hash = HashGeneric(mRuleMapper);
|
|
|
|
uint32_t i;
|
|
for (i = 0; i < mAttrCount; ++i) {
|
|
hash = AddToHash(hash, Attrs()[i].mName.HashValue(),
|
|
Attrs()[i].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) {
|
|
Attrs()[aPos].mValue.SwapValueWith(aValue);
|
|
Attrs()[aPos].~InternalAttr();
|
|
memmove(&Attrs()[aPos], &Attrs()[aPos + 1],
|
|
(mAttrCount - aPos - 1) * sizeof(InternalAttr));
|
|
mAttrCount--;
|
|
}
|
|
|
|
const nsAttrName* nsMappedAttributes::GetExistingAttrNameFromQName(
|
|
const nsAString& aName) const {
|
|
uint32_t i;
|
|
for (i = 0; i < mAttrCount; ++i) {
|
|
if (Attrs()[i].mName.IsAtom()) {
|
|
if (Attrs()[i].mName.Atom()->Equals(aName)) {
|
|
return &Attrs()[i].mName;
|
|
}
|
|
} else {
|
|
if (Attrs()[i].mName.NodeInfo()->QualifiedNameEquals(aName)) {
|
|
return &Attrs()[i].mName;
|
|
}
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
int32_t nsMappedAttributes::IndexOfAttr(const nsAtom* aLocalName) const {
|
|
uint32_t i;
|
|
for (i = 0; i < mAttrCount; ++i) {
|
|
if (Attrs()[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 (uint16_t i = 0; i < mAttrCount; ++i) {
|
|
n += Attrs()[i].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();
|
|
}
|
|
}
|