The Tor Browser: content/base/src/nsAttrAndChildArray.h@deefc01c0e14 (annotated)

content/base/src/nsAttrAndChildArray.h@deefc01c0e14 (annotated)

content/base/src/nsAttrAndChildArray.h

Thu, 15 Jan 2015 21:03:48 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 21:03:48 +0100
branch: TOR_BUG_9701
changeset 11: deefc01c0e14
permissions: -rw-r--r--

Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* 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 "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
 {
 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<nsIContent*>(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<nsIContent> 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;
   nsresult SetAndTakeAttr(nsIAtom* aLocalName, nsAttrValue& aValue);
   nsresult SetAndTakeAttr(nsINodeInfo* 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 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) MOZ_DELETE;
   nsAttrAndChildArray& operator=(const nsAttrAndChildArray& aOther) MOZ_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

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content/base/src/nsAttrAndChildArray.h@deefc01c0e14 (annotated)

content/base/src/nsAttrAndChildArray.h