mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
892 lines
23 KiB
C++
892 lines
23 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Storage of the children and attributes of a DOM node; storage for
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* the two is unified to minimize footprint.
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*/
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#include "nsAttrAndChildArray.h"
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#include "mozilla/CheckedInt.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/MemoryReporting.h"
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#include "nsMappedAttributeElement.h"
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#include "nsString.h"
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#include "nsHTMLStyleSheet.h"
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#include "nsRuleWalker.h"
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#include "nsMappedAttributes.h"
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#include "nsUnicharUtils.h"
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#include "nsAutoPtr.h"
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#include "nsContentUtils.h" // nsAutoScriptBlocker
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using mozilla::CheckedUint32;
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/*
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CACHE_POINTER_SHIFT indicates how many steps to downshift the |this| pointer.
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It should be small enough to not cause collisions between adjecent arrays, and
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large enough to make sure that all indexes are used. The size below is based
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on the size of the smallest possible element (currently 24[*] bytes) which is
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the smallest distance between two nsAttrAndChildArray. 24/(2^_5_) is 0.75.
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This means that two adjacent nsAttrAndChildArrays will overlap one in 4 times.
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However not all elements will have enough children to get cached. And any
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allocator that doesn't return addresses aligned to 64 bytes will ensure that
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any index will get used.
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[*] sizeof(Element) + 4 bytes for nsIDOMElement vtable pointer.
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*/
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#define CACHE_POINTER_SHIFT 5
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#define CACHE_NUM_SLOTS 128
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#define CACHE_CHILD_LIMIT 10
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#define CACHE_GET_INDEX(_array) \
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((NS_PTR_TO_INT32(_array) >> CACHE_POINTER_SHIFT) & \
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(CACHE_NUM_SLOTS - 1))
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struct IndexCacheSlot
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{
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const nsAttrAndChildArray* array;
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int32_t index;
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};
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// This is inited to all zeroes since it's static. Though even if it wasn't
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// the worst thing that'd happen is a small inefficency if you'd get a false
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// positive cachehit.
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static IndexCacheSlot indexCache[CACHE_NUM_SLOTS];
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static
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inline
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void
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AddIndexToCache(const nsAttrAndChildArray* aArray, int32_t aIndex)
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{
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uint32_t ix = CACHE_GET_INDEX(aArray);
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indexCache[ix].array = aArray;
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indexCache[ix].index = aIndex;
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}
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static
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inline
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int32_t
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GetIndexFromCache(const nsAttrAndChildArray* aArray)
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{
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uint32_t ix = CACHE_GET_INDEX(aArray);
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return indexCache[ix].array == aArray ? indexCache[ix].index : -1;
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}
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/**
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* Due to a compiler bug in VisualAge C++ for AIX, we need to return the
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* address of the first index into mBuffer here, instead of simply returning
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* mBuffer itself.
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*
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* See Bug 231104 for more information.
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*/
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#define ATTRS(_impl) \
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reinterpret_cast<InternalAttr*>(&((_impl)->mBuffer[0]))
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#define NS_IMPL_EXTRA_SIZE \
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((sizeof(Impl) - sizeof(mImpl->mBuffer)) / sizeof(void*))
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nsAttrAndChildArray::nsAttrAndChildArray()
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: mImpl(nullptr)
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{
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}
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nsAttrAndChildArray::~nsAttrAndChildArray()
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{
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if (!mImpl) {
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return;
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}
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Clear();
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free(mImpl);
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}
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nsIContent*
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nsAttrAndChildArray::GetSafeChildAt(uint32_t aPos) const
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{
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if (aPos < ChildCount()) {
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return ChildAt(aPos);
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}
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return nullptr;
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}
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nsIContent * const *
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nsAttrAndChildArray::GetChildArray(uint32_t* aChildCount) const
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{
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*aChildCount = ChildCount();
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if (!*aChildCount) {
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return nullptr;
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}
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return reinterpret_cast<nsIContent**>(mImpl->mBuffer + AttrSlotsSize());
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}
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nsresult
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nsAttrAndChildArray::InsertChildAt(nsIContent* aChild, uint32_t aPos)
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{
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NS_ASSERTION(aChild, "nullchild");
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NS_ASSERTION(aPos <= ChildCount(), "out-of-bounds");
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uint32_t offset = AttrSlotsSize();
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uint32_t childCount = ChildCount();
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NS_ENSURE_TRUE(childCount < ATTRCHILD_ARRAY_MAX_CHILD_COUNT,
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NS_ERROR_FAILURE);
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// First try to fit new child in existing childlist
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if (mImpl && offset + childCount < mImpl->mBufferSize) {
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void** pos = mImpl->mBuffer + offset + aPos;
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if (childCount != aPos) {
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memmove(pos + 1, pos, (childCount - aPos) * sizeof(nsIContent*));
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}
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SetChildAtPos(pos, aChild, aPos, childCount);
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SetChildCount(childCount + 1);
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return NS_OK;
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}
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// Try to fit new child in existing buffer by compressing attrslots
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if (offset && !mImpl->mBuffer[offset - ATTRSIZE]) {
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// Compress away all empty slots while we're at it. This might not be the
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// optimal thing to do.
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uint32_t attrCount = NonMappedAttrCount();
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void** newStart = mImpl->mBuffer + attrCount * ATTRSIZE;
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void** oldStart = mImpl->mBuffer + offset;
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memmove(newStart, oldStart, aPos * sizeof(nsIContent*));
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memmove(&newStart[aPos + 1], &oldStart[aPos],
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(childCount - aPos) * sizeof(nsIContent*));
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SetChildAtPos(newStart + aPos, aChild, aPos, childCount);
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SetAttrSlotAndChildCount(attrCount, childCount + 1);
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return NS_OK;
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}
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// We can't fit in current buffer, Realloc time!
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if (!GrowBy(1)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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void** pos = mImpl->mBuffer + offset + aPos;
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if (childCount != aPos) {
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memmove(pos + 1, pos, (childCount - aPos) * sizeof(nsIContent*));
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}
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SetChildAtPos(pos, aChild, aPos, childCount);
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SetChildCount(childCount + 1);
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return NS_OK;
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}
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void
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nsAttrAndChildArray::RemoveChildAt(uint32_t aPos)
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{
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// Just store the return value of TakeChildAt in an nsCOMPtr to
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// trigger a release.
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nsCOMPtr<nsIContent> child = TakeChildAt(aPos);
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}
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already_AddRefed<nsIContent>
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nsAttrAndChildArray::TakeChildAt(uint32_t aPos)
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{
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NS_ASSERTION(aPos < ChildCount(), "out-of-bounds");
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uint32_t childCount = ChildCount();
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void** pos = mImpl->mBuffer + AttrSlotsSize() + aPos;
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nsIContent* child = static_cast<nsIContent*>(*pos);
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if (child->mPreviousSibling) {
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child->mPreviousSibling->mNextSibling = child->mNextSibling;
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}
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if (child->mNextSibling) {
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child->mNextSibling->mPreviousSibling = child->mPreviousSibling;
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}
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child->mPreviousSibling = child->mNextSibling = nullptr;
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memmove(pos, pos + 1, (childCount - aPos - 1) * sizeof(nsIContent*));
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SetChildCount(childCount - 1);
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return dont_AddRef(child);
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}
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int32_t
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nsAttrAndChildArray::IndexOfChild(const nsINode* aPossibleChild) const
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{
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if (!mImpl) {
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return -1;
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}
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void** children = mImpl->mBuffer + AttrSlotsSize();
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// Use signed here since we compare count to cursor which has to be signed
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int32_t i, count = ChildCount();
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if (count >= CACHE_CHILD_LIMIT) {
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int32_t cursor = GetIndexFromCache(this);
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// Need to compare to count here since we may have removed children since
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// the index was added to the cache.
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// We're also relying on that GetIndexFromCache returns -1 if no cached
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// index was found.
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if (cursor >= count) {
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cursor = -1;
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}
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// Seek outward from the last found index. |inc| will change sign every
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// run through the loop. |sign| just exists to make sure the absolute
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// value of |inc| increases each time through.
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int32_t inc = 1, sign = 1;
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while (cursor >= 0 && cursor < count) {
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if (children[cursor] == aPossibleChild) {
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AddIndexToCache(this, cursor);
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return cursor;
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}
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cursor += inc;
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inc = -inc - sign;
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sign = -sign;
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}
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// We ran into one 'edge'. Add inc to cursor once more to get back to
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// the 'side' where we still need to search, then step in the |sign|
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// direction.
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cursor += inc;
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if (sign > 0) {
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for (; cursor < count; ++cursor) {
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if (children[cursor] == aPossibleChild) {
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AddIndexToCache(this, cursor);
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return static_cast<int32_t>(cursor);
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}
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}
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}
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else {
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for (; cursor >= 0; --cursor) {
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if (children[cursor] == aPossibleChild) {
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AddIndexToCache(this, cursor);
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return static_cast<int32_t>(cursor);
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}
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}
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}
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// The child wasn't even in the remaining children
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return -1;
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}
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for (i = 0; i < count; ++i) {
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if (children[i] == aPossibleChild) {
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return static_cast<int32_t>(i);
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}
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}
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return -1;
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}
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uint32_t
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nsAttrAndChildArray::AttrCount() const
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{
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return NonMappedAttrCount() + MappedAttrCount();
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}
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const nsAttrValue*
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nsAttrAndChildArray::GetAttr(nsIAtom* aLocalName, int32_t aNamespaceID) const
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{
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uint32_t i, slotCount = AttrSlotCount();
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if (aNamespaceID == kNameSpaceID_None) {
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// This should be the common case so lets make an optimized loop
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for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
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if (ATTRS(mImpl)[i].mName.Equals(aLocalName)) {
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return &ATTRS(mImpl)[i].mValue;
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}
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}
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if (mImpl && mImpl->mMappedAttrs) {
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return mImpl->mMappedAttrs->GetAttr(aLocalName);
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}
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}
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else {
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for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
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if (ATTRS(mImpl)[i].mName.Equals(aLocalName, aNamespaceID)) {
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return &ATTRS(mImpl)[i].mValue;
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}
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}
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}
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return nullptr;
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}
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const nsAttrValue*
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nsAttrAndChildArray::GetAttr(const nsAString& aLocalName) const
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{
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uint32_t i, slotCount = AttrSlotCount();
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for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
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if (ATTRS(mImpl)[i].mName.Equals(aLocalName)) {
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return &ATTRS(mImpl)[i].mValue;
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}
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}
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if (mImpl && mImpl->mMappedAttrs) {
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return mImpl->mMappedAttrs->GetAttr(aLocalName);
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}
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return nullptr;
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}
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const nsAttrValue*
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nsAttrAndChildArray::GetAttr(const nsAString& aName,
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nsCaseTreatment aCaseSensitive) const
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{
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// Check whether someone is being silly and passing non-lowercase
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// attr names.
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if (aCaseSensitive == eIgnoreCase &&
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nsContentUtils::StringContainsASCIIUpper(aName)) {
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// Try again with a lowercased name, but make sure we can't reenter this
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// block by passing eCaseSensitive for aCaseSensitive.
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nsAutoString lowercase;
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nsContentUtils::ASCIIToLower(aName, lowercase);
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return GetAttr(lowercase, eCaseMatters);
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}
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uint32_t i, slotCount = AttrSlotCount();
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for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
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if (ATTRS(mImpl)[i].mName.QualifiedNameEquals(aName)) {
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return &ATTRS(mImpl)[i].mValue;
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}
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}
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if (mImpl && mImpl->mMappedAttrs) {
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const nsAttrValue* val =
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mImpl->mMappedAttrs->GetAttr(aName);
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if (val) {
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return val;
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}
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}
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return nullptr;
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}
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const nsAttrValue*
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nsAttrAndChildArray::AttrAt(uint32_t aPos) const
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{
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NS_ASSERTION(aPos < AttrCount(),
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"out-of-bounds access in nsAttrAndChildArray");
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uint32_t mapped = MappedAttrCount();
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if (aPos < mapped) {
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return mImpl->mMappedAttrs->AttrAt(aPos);
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}
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return &ATTRS(mImpl)[aPos - mapped].mValue;
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}
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nsresult
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nsAttrAndChildArray::SetAndSwapAttr(nsIAtom* aLocalName, nsAttrValue& aValue)
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{
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uint32_t i, slotCount = AttrSlotCount();
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for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
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if (ATTRS(mImpl)[i].mName.Equals(aLocalName)) {
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ATTRS(mImpl)[i].mValue.SwapValueWith(aValue);
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return NS_OK;
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}
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}
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NS_ENSURE_TRUE(i < ATTRCHILD_ARRAY_MAX_ATTR_COUNT,
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NS_ERROR_FAILURE);
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if (i == slotCount && !AddAttrSlot()) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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new (&ATTRS(mImpl)[i].mName) nsAttrName(aLocalName);
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new (&ATTRS(mImpl)[i].mValue) nsAttrValue();
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ATTRS(mImpl)[i].mValue.SwapValueWith(aValue);
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return NS_OK;
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}
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nsresult
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nsAttrAndChildArray::SetAndSwapAttr(mozilla::dom::NodeInfo* aName, nsAttrValue& aValue)
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{
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int32_t namespaceID = aName->NamespaceID();
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nsIAtom* localName = aName->NameAtom();
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if (namespaceID == kNameSpaceID_None) {
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return SetAndSwapAttr(localName, aValue);
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}
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uint32_t i, slotCount = AttrSlotCount();
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for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
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if (ATTRS(mImpl)[i].mName.Equals(localName, namespaceID)) {
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ATTRS(mImpl)[i].mName.SetTo(aName);
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ATTRS(mImpl)[i].mValue.Reset();
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ATTRS(mImpl)[i].mValue.SwapValueWith(aValue);
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return NS_OK;
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}
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}
|
||
|
|
||
|
NS_ENSURE_TRUE(i < ATTRCHILD_ARRAY_MAX_ATTR_COUNT,
|
||
|
NS_ERROR_FAILURE);
|
||
|
|
||
|
if (i == slotCount && !AddAttrSlot()) {
|
||
|
return NS_ERROR_OUT_OF_MEMORY;
|
||
|
}
|
||
|
|
||
|
new (&ATTRS(mImpl)[i].mName) nsAttrName(aName);
|
||
|
new (&ATTRS(mImpl)[i].mValue) nsAttrValue();
|
||
|
ATTRS(mImpl)[i].mValue.SwapValueWith(aValue);
|
||
|
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
|
||
|
nsresult
|
||
|
nsAttrAndChildArray::RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue)
|
||
|
{
|
||
|
NS_ASSERTION(aPos < AttrCount(), "out-of-bounds");
|
||
|
|
||
|
uint32_t mapped = MappedAttrCount();
|
||
|
if (aPos < mapped) {
|
||
|
if (mapped == 1) {
|
||
|
// We're removing the last mapped attribute. Can't swap in this
|
||
|
// case; have to copy.
|
||
|
aValue.SetTo(*mImpl->mMappedAttrs->AttrAt(0));
|
||
|
NS_RELEASE(mImpl->mMappedAttrs);
|
||
|
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
RefPtr<nsMappedAttributes> mapped =
|
||
|
GetModifiableMapped(nullptr, nullptr, false);
|
||
|
|
||
|
mapped->RemoveAttrAt(aPos, aValue);
|
||
|
|
||
|
return MakeMappedUnique(mapped);
|
||
|
}
|
||
|
|
||
|
aPos -= mapped;
|
||
|
ATTRS(mImpl)[aPos].mValue.SwapValueWith(aValue);
|
||
|
ATTRS(mImpl)[aPos].~InternalAttr();
|
||
|
|
||
|
uint32_t slotCount = AttrSlotCount();
|
||
|
memmove(&ATTRS(mImpl)[aPos],
|
||
|
&ATTRS(mImpl)[aPos + 1],
|
||
|
(slotCount - aPos - 1) * sizeof(InternalAttr));
|
||
|
memset(&ATTRS(mImpl)[slotCount - 1], 0, sizeof(InternalAttr));
|
||
|
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
const nsAttrName*
|
||
|
nsAttrAndChildArray::AttrNameAt(uint32_t aPos) const
|
||
|
{
|
||
|
NS_ASSERTION(aPos < AttrCount(),
|
||
|
"out-of-bounds access in nsAttrAndChildArray");
|
||
|
|
||
|
uint32_t mapped = MappedAttrCount();
|
||
|
if (aPos < mapped) {
|
||
|
return mImpl->mMappedAttrs->NameAt(aPos);
|
||
|
}
|
||
|
|
||
|
return &ATTRS(mImpl)[aPos - mapped].mName;
|
||
|
}
|
||
|
|
||
|
const nsAttrName*
|
||
|
nsAttrAndChildArray::GetSafeAttrNameAt(uint32_t aPos) const
|
||
|
{
|
||
|
uint32_t mapped = MappedAttrCount();
|
||
|
if (aPos < mapped) {
|
||
|
return mImpl->mMappedAttrs->NameAt(aPos);
|
||
|
}
|
||
|
|
||
|
aPos -= mapped;
|
||
|
if (aPos >= AttrSlotCount()) {
|
||
|
return nullptr;
|
||
|
}
|
||
|
|
||
|
void** pos = mImpl->mBuffer + aPos * ATTRSIZE;
|
||
|
if (!*pos) {
|
||
|
return nullptr;
|
||
|
}
|
||
|
|
||
|
return &reinterpret_cast<InternalAttr*>(pos)->mName;
|
||
|
}
|
||
|
|
||
|
const nsAttrName*
|
||
|
nsAttrAndChildArray::GetExistingAttrNameFromQName(const nsAString& aName) const
|
||
|
{
|
||
|
uint32_t i, slotCount = AttrSlotCount();
|
||
|
for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
|
||
|
if (ATTRS(mImpl)[i].mName.QualifiedNameEquals(aName)) {
|
||
|
return &ATTRS(mImpl)[i].mName;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (mImpl && mImpl->mMappedAttrs) {
|
||
|
return mImpl->mMappedAttrs->GetExistingAttrNameFromQName(aName);
|
||
|
}
|
||
|
|
||
|
return nullptr;
|
||
|
}
|
||
|
|
||
|
int32_t
|
||
|
nsAttrAndChildArray::IndexOfAttr(nsIAtom* aLocalName, int32_t aNamespaceID) const
|
||
|
{
|
||
|
int32_t idx;
|
||
|
if (mImpl && mImpl->mMappedAttrs && aNamespaceID == kNameSpaceID_None) {
|
||
|
idx = mImpl->mMappedAttrs->IndexOfAttr(aLocalName);
|
||
|
if (idx >= 0) {
|
||
|
return idx;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
uint32_t i;
|
||
|
uint32_t mapped = MappedAttrCount();
|
||
|
uint32_t slotCount = AttrSlotCount();
|
||
|
if (aNamespaceID == kNameSpaceID_None) {
|
||
|
// This should be the common case so lets make an optimized loop
|
||
|
for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
|
||
|
if (ATTRS(mImpl)[i].mName.Equals(aLocalName)) {
|
||
|
return i + mapped;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
else {
|
||
|
for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
|
||
|
if (ATTRS(mImpl)[i].mName.Equals(aLocalName, aNamespaceID)) {
|
||
|
return i + mapped;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
nsresult
|
||
|
nsAttrAndChildArray::SetAndTakeMappedAttr(nsIAtom* aLocalName,
|
||
|
nsAttrValue& aValue,
|
||
|
nsMappedAttributeElement* aContent,
|
||
|
nsHTMLStyleSheet* aSheet)
|
||
|
{
|
||
|
bool willAdd = true;
|
||
|
if (mImpl && mImpl->mMappedAttrs) {
|
||
|
willAdd = !mImpl->mMappedAttrs->GetAttr(aLocalName);
|
||
|
}
|
||
|
|
||
|
RefPtr<nsMappedAttributes> mapped =
|
||
|
GetModifiableMapped(aContent, aSheet, willAdd);
|
||
|
|
||
|
mapped->SetAndTakeAttr(aLocalName, aValue);
|
||
|
|
||
|
return MakeMappedUnique(mapped);
|
||
|
}
|
||
|
|
||
|
nsresult
|
||
|
nsAttrAndChildArray::DoSetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet)
|
||
|
{
|
||
|
NS_PRECONDITION(mImpl && mImpl->mMappedAttrs,
|
||
|
"Should have mapped attrs here!");
|
||
|
if (aSheet == mImpl->mMappedAttrs->GetStyleSheet()) {
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
RefPtr<nsMappedAttributes> mapped =
|
||
|
GetModifiableMapped(nullptr, nullptr, false);
|
||
|
|
||
|
mapped->SetStyleSheet(aSheet);
|
||
|
|
||
|
return MakeMappedUnique(mapped);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
nsAttrAndChildArray::WalkMappedAttributeStyleRules(nsRuleWalker* aRuleWalker)
|
||
|
{
|
||
|
if (mImpl && mImpl->mMappedAttrs) {
|
||
|
aRuleWalker->Forward(mImpl->mMappedAttrs);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void
|
||
|
nsAttrAndChildArray::Compact()
|
||
|
{
|
||
|
if (!mImpl) {
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
// First compress away empty attrslots
|
||
|
uint32_t slotCount = AttrSlotCount();
|
||
|
uint32_t attrCount = NonMappedAttrCount();
|
||
|
uint32_t childCount = ChildCount();
|
||
|
|
||
|
if (attrCount < slotCount) {
|
||
|
memmove(mImpl->mBuffer + attrCount * ATTRSIZE,
|
||
|
mImpl->mBuffer + slotCount * ATTRSIZE,
|
||
|
childCount * sizeof(nsIContent*));
|
||
|
SetAttrSlotCount(attrCount);
|
||
|
}
|
||
|
|
||
|
// Then resize or free buffer
|
||
|
uint32_t newSize = attrCount * ATTRSIZE + childCount;
|
||
|
if (!newSize && !mImpl->mMappedAttrs) {
|
||
|
free(mImpl);
|
||
|
mImpl = nullptr;
|
||
|
}
|
||
|
else if (newSize < mImpl->mBufferSize) {
|
||
|
mImpl = static_cast<Impl*>(realloc(mImpl, (newSize + NS_IMPL_EXTRA_SIZE) * sizeof(nsIContent*)));
|
||
|
NS_ASSERTION(mImpl, "failed to reallocate to smaller buffer");
|
||
|
|
||
|
mImpl->mBufferSize = newSize;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void
|
||
|
nsAttrAndChildArray::Clear()
|
||
|
{
|
||
|
if (!mImpl) {
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (mImpl->mMappedAttrs) {
|
||
|
NS_RELEASE(mImpl->mMappedAttrs);
|
||
|
}
|
||
|
|
||
|
uint32_t i, slotCount = AttrSlotCount();
|
||
|
for (i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
|
||
|
ATTRS(mImpl)[i].~InternalAttr();
|
||
|
}
|
||
|
|
||
|
nsAutoScriptBlocker scriptBlocker;
|
||
|
uint32_t end = slotCount * ATTRSIZE + ChildCount();
|
||
|
for (i = slotCount * ATTRSIZE; i < end; ++i) {
|
||
|
nsIContent* child = static_cast<nsIContent*>(mImpl->mBuffer[i]);
|
||
|
// making this false so tree teardown doesn't end up being
|
||
|
// O(N*D) (number of nodes times average depth of tree).
|
||
|
child->UnbindFromTree(false); // XXX is it better to let the owner do this?
|
||
|
// Make sure to unlink our kids from each other, since someone
|
||
|
// else could stil be holding references to some of them.
|
||
|
|
||
|
// XXXbz We probably can't push this assignment down into the |aNullParent|
|
||
|
// case of UnbindFromTree because we still need the assignment in
|
||
|
// RemoveChildAt. In particular, ContentRemoved fires between
|
||
|
// RemoveChildAt and UnbindFromTree, and in ContentRemoved the sibling
|
||
|
// chain needs to be correct. Though maybe we could set the prev and next
|
||
|
// to point to each other but keep the kid being removed pointing to them
|
||
|
// through ContentRemoved so consumers can find where it used to be in the
|
||
|
// list?
|
||
|
child->mPreviousSibling = child->mNextSibling = nullptr;
|
||
|
NS_RELEASE(child);
|
||
|
}
|
||
|
|
||
|
SetAttrSlotAndChildCount(0, 0);
|
||
|
}
|
||
|
|
||
|
uint32_t
|
||
|
nsAttrAndChildArray::NonMappedAttrCount() const
|
||
|
{
|
||
|
if (!mImpl) {
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
uint32_t count = AttrSlotCount();
|
||
|
while (count > 0 && !mImpl->mBuffer[(count - 1) * ATTRSIZE]) {
|
||
|
--count;
|
||
|
}
|
||
|
|
||
|
return count;
|
||
|
}
|
||
|
|
||
|
uint32_t
|
||
|
nsAttrAndChildArray::MappedAttrCount() const
|
||
|
{
|
||
|
return mImpl && mImpl->mMappedAttrs ? (uint32_t)mImpl->mMappedAttrs->Count() : 0;
|
||
|
}
|
||
|
|
||
|
nsMappedAttributes*
|
||
|
nsAttrAndChildArray::GetModifiableMapped(nsMappedAttributeElement* aContent,
|
||
|
nsHTMLStyleSheet* aSheet,
|
||
|
bool aWillAddAttr)
|
||
|
{
|
||
|
if (mImpl && mImpl->mMappedAttrs) {
|
||
|
return mImpl->mMappedAttrs->Clone(aWillAddAttr);
|
||
|
}
|
||
|
|
||
|
MOZ_ASSERT(aContent, "Trying to create modifiable without content");
|
||
|
|
||
|
nsMapRuleToAttributesFunc mapRuleFunc =
|
||
|
aContent->GetAttributeMappingFunction();
|
||
|
return new nsMappedAttributes(aSheet, mapRuleFunc);
|
||
|
}
|
||
|
|
||
|
nsresult
|
||
|
nsAttrAndChildArray::MakeMappedUnique(nsMappedAttributes* aAttributes)
|
||
|
{
|
||
|
NS_ASSERTION(aAttributes, "missing attributes");
|
||
|
|
||
|
if (!mImpl && !GrowBy(1)) {
|
||
|
return NS_ERROR_OUT_OF_MEMORY;
|
||
|
}
|
||
|
|
||
|
if (!aAttributes->GetStyleSheet()) {
|
||
|
// This doesn't currently happen, but it could if we do loading right
|
||
|
|
||
|
RefPtr<nsMappedAttributes> mapped(aAttributes);
|
||
|
mapped.swap(mImpl->mMappedAttrs);
|
||
|
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
RefPtr<nsMappedAttributes> mapped =
|
||
|
aAttributes->GetStyleSheet()->UniqueMappedAttributes(aAttributes);
|
||
|
NS_ENSURE_TRUE(mapped, NS_ERROR_OUT_OF_MEMORY);
|
||
|
|
||
|
if (mapped != aAttributes) {
|
||
|
// Reset the stylesheet of aAttributes so that it doesn't spend time
|
||
|
// trying to remove itself from the hash. There is no risk that aAttributes
|
||
|
// is in the hash since it will always have come from GetModifiableMapped,
|
||
|
// which never returns maps that are in the hash (such hashes are by
|
||
|
// nature not modifiable).
|
||
|
aAttributes->DropStyleSheetReference();
|
||
|
}
|
||
|
mapped.swap(mImpl->mMappedAttrs);
|
||
|
|
||
|
return NS_OK;
|
||
|
}
|
||
|
|
||
|
|
||
|
bool
|
||
|
nsAttrAndChildArray::GrowBy(uint32_t aGrowSize)
|
||
|
{
|
||
|
CheckedUint32 size = 0;
|
||
|
if (mImpl) {
|
||
|
size += mImpl->mBufferSize;
|
||
|
size += NS_IMPL_EXTRA_SIZE;
|
||
|
if (!size.isValid()) {
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
CheckedUint32 minSize = size.value();
|
||
|
minSize += aGrowSize;
|
||
|
if (!minSize.isValid()) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (minSize.value() <= ATTRCHILD_ARRAY_LINEAR_THRESHOLD) {
|
||
|
do {
|
||
|
size += ATTRCHILD_ARRAY_GROWSIZE;
|
||
|
if (!size.isValid()) {
|
||
|
return false;
|
||
|
}
|
||
|
} while (size.value() < minSize.value());
|
||
|
}
|
||
|
else {
|
||
|
size = 1u << mozilla::CeilingLog2(minSize.value());
|
||
|
}
|
||
|
|
||
|
bool needToInitialize = !mImpl;
|
||
|
CheckedUint32 neededSize = size;
|
||
|
neededSize *= sizeof(void*);
|
||
|
if (!neededSize.isValid()) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
Impl* newImpl = static_cast<Impl*>(realloc(mImpl, neededSize.value()));
|
||
|
NS_ENSURE_TRUE(newImpl, false);
|
||
|
|
||
|
mImpl = newImpl;
|
||
|
|
||
|
// Set initial counts if we didn't have a buffer before
|
||
|
if (needToInitialize) {
|
||
|
mImpl->mMappedAttrs = nullptr;
|
||
|
SetAttrSlotAndChildCount(0, 0);
|
||
|
}
|
||
|
|
||
|
mImpl->mBufferSize = size.value() - NS_IMPL_EXTRA_SIZE;
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool
|
||
|
nsAttrAndChildArray::AddAttrSlot()
|
||
|
{
|
||
|
uint32_t slotCount = AttrSlotCount();
|
||
|
uint32_t childCount = ChildCount();
|
||
|
|
||
|
CheckedUint32 size = slotCount;
|
||
|
size += 1;
|
||
|
size *= ATTRSIZE;
|
||
|
size += childCount;
|
||
|
if (!size.isValid()) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
// Grow buffer if needed
|
||
|
if (!(mImpl && mImpl->mBufferSize >= size.value()) &&
|
||
|
!GrowBy(ATTRSIZE)) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
void** offset = mImpl->mBuffer + slotCount * ATTRSIZE;
|
||
|
|
||
|
if (childCount > 0) {
|
||
|
memmove(&ATTRS(mImpl)[slotCount + 1], &ATTRS(mImpl)[slotCount],
|
||
|
childCount * sizeof(nsIContent*));
|
||
|
}
|
||
|
|
||
|
SetAttrSlotCount(slotCount + 1);
|
||
|
offset[0] = nullptr;
|
||
|
offset[1] = nullptr;
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
inline void
|
||
|
nsAttrAndChildArray::SetChildAtPos(void** aPos, nsIContent* aChild,
|
||
|
uint32_t aIndex, uint32_t aChildCount)
|
||
|
{
|
||
|
NS_PRECONDITION(!aChild->GetNextSibling(), "aChild with next sibling?");
|
||
|
NS_PRECONDITION(!aChild->GetPreviousSibling(), "aChild with prev sibling?");
|
||
|
|
||
|
*aPos = aChild;
|
||
|
NS_ADDREF(aChild);
|
||
|
if (aIndex != 0) {
|
||
|
nsIContent* previous = static_cast<nsIContent*>(*(aPos - 1));
|
||
|
aChild->mPreviousSibling = previous;
|
||
|
previous->mNextSibling = aChild;
|
||
|
}
|
||
|
if (aIndex != aChildCount) {
|
||
|
nsIContent* next = static_cast<nsIContent*>(*(aPos + 1));
|
||
|
aChild->mNextSibling = next;
|
||
|
next->mPreviousSibling = aChild;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
size_t
|
||
|
nsAttrAndChildArray::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
|
||
|
{
|
||
|
size_t n = 0;
|
||
|
if (mImpl) {
|
||
|
// Don't add the size taken by *mMappedAttrs because it's shared.
|
||
|
|
||
|
n += aMallocSizeOf(mImpl);
|
||
|
|
||
|
uint32_t slotCount = AttrSlotCount();
|
||
|
for (uint32_t i = 0; i < slotCount && AttrSlotIsTaken(i); ++i) {
|
||
|
nsAttrValue* value = &ATTRS(mImpl)[i].mValue;
|
||
|
n += value->SizeOfExcludingThis(aMallocSizeOf);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return n;
|
||
|
}
|
||
|
|