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bdb22da472
Using GetKey() in the move constructor for nsIdentifierMapEntry meant that we were Move'ing a `const AtomOrString&`, which gives a return type of `const AtomOrString&&`, which is nonsensical. But C++, in its wisdom, selects the copy constructor to copy that type, rather than the intended move constructor. To avoid this, just eliminate GetKey() and perform the move directly.
232 lines
6.7 KiB
C++
232 lines
6.7 KiB
C++
/* -*- 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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* Base class for all our document implementations.
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*/
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#ifndef nsIdentifierMapEntry_h
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#define nsIdentifierMapEntry_h
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#include "PLDHashTable.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Move.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/net/ReferrerPolicy.h"
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#include "nsCOMArray.h"
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#include "nsCOMPtr.h"
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#include "nsContentList.h"
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#include "nsAtom.h"
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#include "nsIDocument.h"
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#include "nsTArray.h"
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#include "nsTHashtable.h"
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class nsIContent;
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/**
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* Right now our identifier map entries contain information for 'name'
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* and 'id' mappings of a given string. This is so that
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* nsHTMLDocument::ResolveName only has to do one hash lookup instead
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* of two. It's not clear whether this still matters for performance.
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*
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* We also store the document.all result list here. This is mainly so that
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* when all elements with the given ID are removed and we remove
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* the ID's nsIdentifierMapEntry, the document.all result is released too.
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* Perhaps the document.all results should have their own hashtable
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* in nsHTMLDocument.
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*/
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class nsIdentifierMapEntry : public PLDHashEntryHdr
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{
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public:
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struct AtomOrString
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{
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MOZ_IMPLICIT AtomOrString(nsAtom* aAtom) : mAtom(aAtom) {}
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MOZ_IMPLICIT AtomOrString(const nsAString& aString) : mString(aString) {}
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AtomOrString(const AtomOrString& aOther)
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: mAtom(aOther.mAtom)
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, mString(aOther.mString)
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{
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}
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AtomOrString(AtomOrString&& aOther)
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: mAtom(aOther.mAtom.forget())
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, mString(aOther.mString)
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{
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}
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RefPtr<nsAtom> mAtom;
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const nsString mString;
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};
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typedef const AtomOrString& KeyType;
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typedef const AtomOrString* KeyTypePointer;
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typedef mozilla::dom::Element Element;
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typedef mozilla::net::ReferrerPolicy ReferrerPolicy;
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explicit nsIdentifierMapEntry(const AtomOrString& aKey)
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: mKey(aKey)
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{
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}
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explicit nsIdentifierMapEntry(const AtomOrString* aKey)
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: mKey(aKey ? *aKey : nullptr)
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{
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}
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nsIdentifierMapEntry(nsIdentifierMapEntry&& aOther) :
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mKey(mozilla::Move(aOther.mKey)),
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mIdContentList(mozilla::Move(aOther.mIdContentList)),
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mNameContentList(aOther.mNameContentList.forget()),
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mChangeCallbacks(aOther.mChangeCallbacks.forget()),
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mImageElement(aOther.mImageElement.forget())
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{
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}
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~nsIdentifierMapEntry();
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nsString GetKeyAsString() const
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{
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if (mKey.mAtom) {
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return nsAtomString(mKey.mAtom);
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}
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return mKey.mString;
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}
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bool KeyEquals(const KeyTypePointer aOtherKey) const
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{
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if (mKey.mAtom) {
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if (aOtherKey->mAtom) {
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return mKey.mAtom == aOtherKey->mAtom;
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}
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return mKey.mAtom->Equals(aOtherKey->mString);
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}
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if (aOtherKey->mAtom) {
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return aOtherKey->mAtom->Equals(mKey.mString);
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}
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return mKey.mString.Equals(aOtherKey->mString);
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}
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(const KeyTypePointer aKey)
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{
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return aKey->mAtom ?
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aKey->mAtom->hash() : mozilla::HashString(aKey->mString);
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}
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enum { ALLOW_MEMMOVE = false };
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void AddNameElement(nsINode* aDocument, Element* aElement);
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void RemoveNameElement(Element* aElement);
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bool IsEmpty();
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nsBaseContentList* GetNameContentList() {
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return mNameContentList;
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}
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bool HasNameElement() const {
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return mNameContentList && mNameContentList->Length() != 0;
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}
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/**
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* Returns the element if we know the element associated with this
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* id. Otherwise returns null.
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*/
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Element* GetIdElement();
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/**
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* Returns the list of all elements associated with this id.
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*/
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const nsTArray<Element*>& GetIdElements() const {
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return mIdContentList;
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}
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/**
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* If this entry has a non-null image element set (using SetImageElement),
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* the image element will be returned, otherwise the same as GetIdElement().
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*/
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Element* GetImageIdElement();
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/**
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* Append all the elements with this id to aElements
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*/
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void AppendAllIdContent(nsCOMArray<nsIContent>* aElements);
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/**
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* This can fire ID change callbacks.
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* @return true if the content could be added, false if we failed due
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* to OOM.
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*/
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bool AddIdElement(Element* aElement);
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/**
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* This can fire ID change callbacks.
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*/
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void RemoveIdElement(Element* aElement);
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/**
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* Set the image element override for this ID. This will be returned by
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* GetIdElement(true) if non-null.
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*/
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void SetImageElement(Element* aElement);
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bool HasIdElementExposedAsHTMLDocumentProperty();
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bool HasContentChangeCallback() { return mChangeCallbacks != nullptr; }
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void AddContentChangeCallback(nsIDocument::IDTargetObserver aCallback,
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void* aData, bool aForImage);
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void RemoveContentChangeCallback(nsIDocument::IDTargetObserver aCallback,
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void* aData, bool aForImage);
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void Traverse(nsCycleCollectionTraversalCallback* aCallback);
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struct ChangeCallback {
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nsIDocument::IDTargetObserver mCallback;
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void* mData;
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bool mForImage;
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};
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struct ChangeCallbackEntry : public PLDHashEntryHdr {
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typedef const ChangeCallback KeyType;
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typedef const ChangeCallback* KeyTypePointer;
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explicit ChangeCallbackEntry(const ChangeCallback* aKey) :
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mKey(*aKey) { }
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ChangeCallbackEntry(const ChangeCallbackEntry& toCopy) :
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mKey(toCopy.mKey) { }
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KeyType GetKey() const { return mKey; }
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bool KeyEquals(KeyTypePointer aKey) const {
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return aKey->mCallback == mKey.mCallback &&
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aKey->mData == mKey.mData &&
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aKey->mForImage == mKey.mForImage;
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}
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static KeyTypePointer KeyToPointer(KeyType& aKey) { return &aKey; }
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static PLDHashNumber HashKey(KeyTypePointer aKey)
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{
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return mozilla::HashGeneric(aKey->mCallback, aKey->mData);
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}
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enum { ALLOW_MEMMOVE = true };
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ChangeCallback mKey;
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};
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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private:
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nsIdentifierMapEntry(const nsIdentifierMapEntry& aOther) = delete;
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nsIdentifierMapEntry& operator=(const nsIdentifierMapEntry& aOther) = delete;
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void FireChangeCallbacks(Element* aOldElement, Element* aNewElement,
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bool aImageOnly = false);
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AtomOrString mKey;
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// empty if there are no elements with this ID.
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// The elements are stored as weak pointers.
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AutoTArray<Element*, 1> mIdContentList;
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RefPtr<nsBaseContentList> mNameContentList;
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nsAutoPtr<nsTHashtable<ChangeCallbackEntry> > mChangeCallbacks;
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RefPtr<Element> mImageElement;
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};
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#endif // #ifndef nsIdentifierMapEntry_h
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