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-rw-r--r--dom/base/nsAttrValueInlines.h273
1 files changed, 273 insertions, 0 deletions
diff --git a/dom/base/nsAttrValueInlines.h b/dom/base/nsAttrValueInlines.h
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+/* -*- 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/. */
+
+#ifndef nsAttrValueInlines_h__
+#define nsAttrValueInlines_h__
+
+#include <stdint.h>
+
+#include "nsAttrValue.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ServoUtils.h"
+#include "mozilla/dom/DOMString.h"
+
+namespace mozilla {
+class ShadowParts;
+}
+
+struct MiscContainer final {
+ using ValueType = nsAttrValue::ValueType;
+
+ ValueType mType;
+ // mStringBits points to either nsAtom* or nsStringBuffer* and is used when
+ // mType isn't eCSSDeclaration.
+ // Note eStringBase and eAtomBase is used also to handle the type of
+ // mStringBits.
+ //
+ // Note that we use an atomic here so that we can use Compare-And-Swap
+ // to cache the serialization during the parallel servo traversal. This case
+ // (which happens when the main thread is blocked) is the only case where
+ // mStringBits is mutated off-main-thread. The Atomic needs to be
+ // ReleaseAcquire so that the pointer to the serialization does not become
+ // observable to other threads before the initialization of the pointed-to
+ // memory is also observable.
+ mozilla::Atomic<uintptr_t, mozilla::ReleaseAcquire> mStringBits;
+ union {
+ struct {
+ union {
+ int32_t mInteger;
+ nscolor mColor;
+ uint32_t mEnumValue;
+ mozilla::DeclarationBlock* mCSSDeclaration;
+ nsIURI* mURL;
+ mozilla::AttrAtomArray* mAtomArray;
+ const mozilla::ShadowParts* mShadowParts;
+ const mozilla::SVGAnimatedIntegerPair* mSVGAnimatedIntegerPair;
+ const mozilla::SVGAnimatedLength* mSVGLength;
+ const mozilla::SVGAnimatedNumberPair* mSVGAnimatedNumberPair;
+ const mozilla::SVGAnimatedOrient* mSVGAnimatedOrient;
+ const mozilla::SVGAnimatedPreserveAspectRatio*
+ mSVGAnimatedPreserveAspectRatio;
+ const mozilla::SVGAnimatedViewBox* mSVGAnimatedViewBox;
+ const mozilla::SVGLengthList* mSVGLengthList;
+ const mozilla::SVGNumberList* mSVGNumberList;
+ const mozilla::SVGPathData* mSVGPathData;
+ const mozilla::SVGPointList* mSVGPointList;
+ const mozilla::SVGStringList* mSVGStringList;
+ const mozilla::SVGTransformList* mSVGTransformList;
+ };
+ uint32_t mRefCount : 31;
+ uint32_t mCached : 1;
+ } mValue;
+ double mDoubleValue;
+ };
+
+ MiscContainer() : mType(nsAttrValue::eColor), mStringBits(0) {
+ MOZ_COUNT_CTOR(MiscContainer);
+ mValue.mColor = 0;
+ mValue.mRefCount = 0;
+ mValue.mCached = 0;
+ }
+
+ protected:
+ // Only nsAttrValue should be able to delete us.
+ friend class nsAttrValue;
+
+ ~MiscContainer() {
+ if (IsRefCounted()) {
+ MOZ_ASSERT(mValue.mRefCount == 0);
+ MOZ_ASSERT(!mValue.mCached);
+ }
+ MOZ_COUNT_DTOR(MiscContainer);
+ }
+
+ public:
+ bool GetString(nsAString& aString) const;
+
+ void* GetStringOrAtomPtr(bool& aIsString) const {
+ uintptr_t bits = mStringBits;
+ aIsString =
+ nsAttrValue::ValueBaseType(mStringBits & NS_ATTRVALUE_BASETYPE_MASK) ==
+ nsAttrValue::eStringBase;
+ return reinterpret_cast<void*>(bits & NS_ATTRVALUE_POINTERVALUE_MASK);
+ }
+
+ nsAtom* GetStoredAtom() const {
+ bool isString = false;
+ void* ptr = GetStringOrAtomPtr(isString);
+ return isString ? nullptr : static_cast<nsAtom*>(ptr);
+ }
+
+ nsStringBuffer* GetStoredStringBuffer() const {
+ bool isString = false;
+ void* ptr = GetStringOrAtomPtr(isString);
+ return isString ? static_cast<nsStringBuffer*>(ptr) : nullptr;
+ }
+
+ void SetStringBitsMainThread(uintptr_t aBits) {
+ // mStringBits is atomic, but the callers of this function are
+ // single-threaded so they don't have to worry about it.
+ MOZ_ASSERT(!mozilla::IsInServoTraversal());
+ MOZ_ASSERT(NS_IsMainThread());
+ mStringBits = aBits;
+ }
+
+ inline bool IsRefCounted() const {
+ // Nothing stops us from refcounting (and sharing) other types of
+ // MiscContainer (except eDoubleValue types) but there's no compelling
+ // reason to.
+ return mType == nsAttrValue::eCSSDeclaration ||
+ mType == nsAttrValue::eShadowParts;
+ }
+
+ inline int32_t AddRef() {
+ MOZ_ASSERT(IsRefCounted());
+ return ++mValue.mRefCount;
+ }
+
+ inline int32_t Release() {
+ MOZ_ASSERT(IsRefCounted());
+ return --mValue.mRefCount;
+ }
+
+ void Cache();
+ void Evict();
+};
+
+/**
+ * Implementation of inline methods
+ */
+
+inline int32_t nsAttrValue::GetIntegerValue() const {
+ MOZ_ASSERT(Type() == eInteger, "wrong type");
+ return (BaseType() == eIntegerBase) ? GetIntInternal()
+ : GetMiscContainer()->mValue.mInteger;
+}
+
+inline int16_t nsAttrValue::GetEnumValue() const {
+ MOZ_ASSERT(Type() == eEnum, "wrong type");
+ // We don't need to worry about sign extension here since we're
+ // returning an int16_t which will cut away the top bits.
+ return static_cast<int16_t>(((BaseType() == eIntegerBase)
+ ? static_cast<uint32_t>(GetIntInternal())
+ : GetMiscContainer()->mValue.mEnumValue) >>
+ NS_ATTRVALUE_ENUMTABLEINDEX_BITS);
+}
+
+inline double nsAttrValue::GetPercentValue() const {
+ MOZ_ASSERT(Type() == ePercent, "wrong type");
+ if (BaseType() == eIntegerBase) {
+ return GetIntInternal() / 100.0f;
+ }
+ return GetMiscContainer()->mDoubleValue / 100.0f;
+}
+
+inline mozilla::AttrAtomArray* nsAttrValue::GetAtomArrayValue() const {
+ MOZ_ASSERT(Type() == eAtomArray, "wrong type");
+ return GetMiscContainer()->mValue.mAtomArray;
+}
+
+inline mozilla::DeclarationBlock* nsAttrValue::GetCSSDeclarationValue() const {
+ MOZ_ASSERT(Type() == eCSSDeclaration, "wrong type");
+ return GetMiscContainer()->mValue.mCSSDeclaration;
+}
+
+inline nsIURI* nsAttrValue::GetURLValue() const {
+ MOZ_ASSERT(Type() == eURL, "wrong type");
+ return GetMiscContainer()->mValue.mURL;
+}
+
+inline double nsAttrValue::GetDoubleValue() const {
+ MOZ_ASSERT(Type() == eDoubleValue, "wrong type");
+ return GetMiscContainer()->mDoubleValue;
+}
+
+inline bool nsAttrValue::IsSVGType(ValueType aType) const {
+ return aType >= eSVGTypesBegin && aType <= eSVGTypesEnd;
+}
+
+inline bool nsAttrValue::StoresOwnData() const {
+ if (BaseType() != eOtherBase) {
+ return true;
+ }
+ ValueType t = Type();
+ return t != eCSSDeclaration && !IsSVGType(t);
+}
+
+inline void nsAttrValue::SetPtrValueAndType(void* aValue, ValueBaseType aType) {
+ NS_ASSERTION(!(NS_PTR_TO_INT32(aValue) & ~NS_ATTRVALUE_POINTERVALUE_MASK),
+ "pointer not properly aligned, this will crash");
+ mBits = reinterpret_cast<intptr_t>(aValue) | aType;
+}
+
+inline void nsAttrValue::ResetIfSet() {
+ if (mBits) {
+ Reset();
+ }
+}
+
+inline MiscContainer* nsAttrValue::GetMiscContainer() const {
+ NS_ASSERTION(BaseType() == eOtherBase, "wrong type");
+ return static_cast<MiscContainer*>(GetPtr());
+}
+
+inline int32_t nsAttrValue::GetIntInternal() const {
+ NS_ASSERTION(BaseType() == eIntegerBase, "getting integer from non-integer");
+ // Make sure we get a signed value.
+ // Lets hope the optimizer optimizes this into a shift. Unfortunatly signed
+ // bitshift right is implementaion dependant.
+ return static_cast<int32_t>(mBits & ~NS_ATTRVALUE_INTEGERTYPE_MASK) /
+ NS_ATTRVALUE_INTEGERTYPE_MULTIPLIER;
+}
+
+inline nsAttrValue::ValueType nsAttrValue::Type() const {
+ switch (BaseType()) {
+ case eIntegerBase: {
+ return static_cast<ValueType>(mBits & NS_ATTRVALUE_INTEGERTYPE_MASK);
+ }
+ case eOtherBase: {
+ return GetMiscContainer()->mType;
+ }
+ default: {
+ return static_cast<ValueType>(static_cast<uint16_t>(BaseType()));
+ }
+ }
+}
+
+inline nsAtom* nsAttrValue::GetAtomValue() const {
+ MOZ_ASSERT(Type() == eAtom, "wrong type");
+ return reinterpret_cast<nsAtom*>(GetPtr());
+}
+
+inline void nsAttrValue::ToString(mozilla::dom::DOMString& aResult) const {
+ switch (Type()) {
+ case eString: {
+ nsStringBuffer* str = static_cast<nsStringBuffer*>(GetPtr());
+ if (str) {
+ aResult.SetKnownLiveStringBuffer(
+ str, str->StorageSize() / sizeof(char16_t) - 1);
+ }
+ // else aResult is already empty
+ return;
+ }
+ case eAtom: {
+ nsAtom* atom = static_cast<nsAtom*>(GetPtr());
+ aResult.SetKnownLiveAtom(atom, mozilla::dom::DOMString::eNullNotExpected);
+ break;
+ }
+ default: {
+ ToString(aResult.AsAString());
+ }
+ }
+}
+
+inline const mozilla::ShadowParts& nsAttrValue::GetShadowPartsValue() const {
+ MOZ_ASSERT(Type() == eShadowParts);
+ return *GetMiscContainer()->mValue.mShadowParts;
+}
+
+#endif
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