From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- dom/base/nsAttrAndChildArray.h | 222 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 222 insertions(+) create mode 100644 dom/base/nsAttrAndChildArray.h (limited to 'dom/base/nsAttrAndChildArray.h') diff --git a/dom/base/nsAttrAndChildArray.h b/dom/base/nsAttrAndChildArray.h new file mode 100644 index 000000000..f34370c43 --- /dev/null +++ b/dom/base/nsAttrAndChildArray.h @@ -0,0 +1,222 @@ +/* -*- 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/. */ + +/* + * Storage of the children and attributes of a DOM node; storage for + * the two is unified to minimize footprint. + */ + +#ifndef nsAttrAndChildArray_h___ +#define nsAttrAndChildArray_h___ + +#include "mozilla/Attributes.h" +#include "mozilla/MemoryReporting.h" +#include "mozilla/dom/BorrowedAttrInfo.h" + +#include "nscore.h" +#include "nsAttrName.h" +#include "nsAttrValue.h" +#include "nsCaseTreatment.h" + +class nsINode; +class nsIContent; +class nsMappedAttributes; +class nsHTMLStyleSheet; +class nsRuleWalker; +class nsMappedAttributeElement; + +#define ATTRCHILD_ARRAY_GROWSIZE 8 +#define ATTRCHILD_ARRAY_LINEAR_THRESHOLD 32 + +#define ATTRCHILD_ARRAY_ATTR_SLOTS_BITS 10 + +#define ATTRCHILD_ARRAY_MAX_ATTR_COUNT \ + ((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1) + +#define ATTRCHILD_ARRAY_MAX_CHILD_COUNT \ + (~uint32_t(0) >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) + +#define ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK \ + ((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1) + + +#define ATTRSIZE (sizeof(InternalAttr) / sizeof(void*)) + +class nsAttrAndChildArray +{ + typedef mozilla::dom::BorrowedAttrInfo BorrowedAttrInfo; +public: + nsAttrAndChildArray(); + ~nsAttrAndChildArray(); + + uint32_t ChildCount() const + { + return mImpl ? (mImpl->mAttrAndChildCount >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) : 0; + } + nsIContent* ChildAt(uint32_t aPos) const + { + NS_ASSERTION(aPos < ChildCount(), "out-of-bounds access in nsAttrAndChildArray"); + return reinterpret_cast(mImpl->mBuffer[AttrSlotsSize() + aPos]); + } + nsIContent* GetSafeChildAt(uint32_t aPos) const; + nsIContent * const * GetChildArray(uint32_t* aChildCount) const; + nsresult AppendChild(nsIContent* aChild) + { + return InsertChildAt(aChild, ChildCount()); + } + nsresult InsertChildAt(nsIContent* aChild, uint32_t aPos); + void RemoveChildAt(uint32_t aPos); + // Like RemoveChildAt but hands the reference to the child being + // removed back to the caller instead of just releasing it. + already_AddRefed TakeChildAt(uint32_t aPos); + int32_t IndexOfChild(const nsINode* aPossibleChild) const; + + bool HasAttrs() const + { + return MappedAttrCount() || (AttrSlotCount() && AttrSlotIsTaken(0)); + } + + uint32_t AttrCount() const; + const nsAttrValue* GetAttr(nsIAtom* aLocalName, + int32_t aNamespaceID = kNameSpaceID_None) const; + // As above but using a string attr name and always using + // kNameSpaceID_None. This is always case-sensitive. + const nsAttrValue* GetAttr(const nsAString& aName) const; + // Get an nsAttrValue by qualified name. Can optionally do + // ASCII-case-insensitive name matching. + const nsAttrValue* GetAttr(const nsAString& aName, + nsCaseTreatment aCaseSensitive) const; + const nsAttrValue* AttrAt(uint32_t aPos) const; + // SetAndSwapAttr swaps the current attribute value with aValue. + nsresult SetAndSwapAttr(nsIAtom* aLocalName, nsAttrValue& aValue); + nsresult SetAndSwapAttr(mozilla::dom::NodeInfo* aName, nsAttrValue& aValue); + + // Remove the attr at position aPos. The value of the attr is placed in + // aValue; any value that was already in aValue is destroyed. + nsresult RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue); + + // Returns attribute name at given position, *not* out-of-bounds safe + const nsAttrName* AttrNameAt(uint32_t aPos) const; + + // Returns the attribute info at a given position, *not* out-of-bounds safe + BorrowedAttrInfo AttrInfoAt(uint32_t aPos) const; + + // Returns attribute name at given position or null if aPos is out-of-bounds + const nsAttrName* GetSafeAttrNameAt(uint32_t aPos) const; + + const nsAttrName* GetExistingAttrNameFromQName(const nsAString& aName) const; + int32_t IndexOfAttr(nsIAtom* aLocalName, int32_t aNamespaceID = kNameSpaceID_None) const; + + nsresult SetAndTakeMappedAttr(nsIAtom* aLocalName, nsAttrValue& aValue, + nsMappedAttributeElement* aContent, + nsHTMLStyleSheet* aSheet); + nsresult SetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet) { + if (!mImpl || !mImpl->mMappedAttrs) { + return NS_OK; + } + return DoSetMappedAttrStyleSheet(aSheet); + } + void WalkMappedAttributeStyleRules(nsRuleWalker* aRuleWalker); + + void Compact(); + + bool CanFitMoreAttrs() const + { + return AttrSlotCount() < ATTRCHILD_ARRAY_MAX_ATTR_COUNT || + !AttrSlotIsTaken(ATTRCHILD_ARRAY_MAX_ATTR_COUNT - 1); + } + + size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; + bool HasMappedAttrs() const + { + return MappedAttrCount(); + } + +private: + nsAttrAndChildArray(const nsAttrAndChildArray& aOther) = delete; + nsAttrAndChildArray& operator=(const nsAttrAndChildArray& aOther) = delete; + + void Clear(); + + uint32_t NonMappedAttrCount() const; + uint32_t MappedAttrCount() const; + + // Returns a non-null zero-refcount object. + nsMappedAttributes* + GetModifiableMapped(nsMappedAttributeElement* aContent, + nsHTMLStyleSheet* aSheet, + bool aWillAddAttr); + nsresult MakeMappedUnique(nsMappedAttributes* aAttributes); + + uint32_t AttrSlotsSize() const + { + return AttrSlotCount() * ATTRSIZE; + } + + uint32_t AttrSlotCount() const + { + return mImpl ? mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK : 0; + } + + bool AttrSlotIsTaken(uint32_t aSlot) const + { + NS_PRECONDITION(aSlot < AttrSlotCount(), "out-of-bounds"); + return mImpl->mBuffer[aSlot * ATTRSIZE]; + } + + void SetChildCount(uint32_t aCount) + { + mImpl->mAttrAndChildCount = + (mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) | + (aCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS); + } + + void SetAttrSlotCount(uint32_t aCount) + { + mImpl->mAttrAndChildCount = + (mImpl->mAttrAndChildCount & ~ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) | + aCount; + } + + void SetAttrSlotAndChildCount(uint32_t aSlotCount, uint32_t aChildCount) + { + mImpl->mAttrAndChildCount = aSlotCount | + (aChildCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS); + } + + bool GrowBy(uint32_t aGrowSize); + bool AddAttrSlot(); + + /** + * Set *aPos to aChild and update sibling pointers as needed. aIndex is the + * index at which aChild is actually being inserted. aChildCount is the + * number of kids we had before the insertion. + */ + inline void SetChildAtPos(void** aPos, nsIContent* aChild, uint32_t aIndex, + uint32_t aChildCount); + + /** + * Guts of SetMappedAttrStyleSheet for the rare case when we have mapped attrs + */ + nsresult DoSetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet); + + struct InternalAttr + { + nsAttrName mName; + nsAttrValue mValue; + }; + + struct Impl { + uint32_t mAttrAndChildCount; + uint32_t mBufferSize; + nsMappedAttributes* mMappedAttrs; + void* mBuffer[1]; + }; + + Impl* mImpl; +}; + +#endif -- cgit v1.2.3