forked from mirrors/gecko-dev
14ca007916
Also adds missing includes in some files, these were previously only transivitely included through mozilla/TypeTraits.h. Differential Revision: https://phabricator.services.mozilla.com/D68561 --HG-- extra : moz-landing-system : lando
85 lines
3 KiB
C++
85 lines
3 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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// This header will be included by headers that define refpointer and array
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// classes in order to specialize CC helpers such as ImplCycleCollectionTraverse
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// for them.
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#ifndef nsCycleCollectionNoteChild_h__
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#define nsCycleCollectionNoteChild_h__
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#include "nsCycleCollectionTraversalCallback.h"
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#include "mozilla/Likely.h"
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enum { CycleCollectionEdgeNameArrayFlag = 1 };
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// Just a helper for appending "[i]". Didn't want to pull in string headers
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// here.
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void CycleCollectionNoteEdgeNameImpl(
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nsCycleCollectionTraversalCallback& aCallback, const char* aName,
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uint32_t aFlags = 0);
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// Should be inlined so that in the no-debug-info case this is just a simple
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// if().
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MOZ_ALWAYS_INLINE void CycleCollectionNoteEdgeName(
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nsCycleCollectionTraversalCallback& aCallback, const char* aName,
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uint32_t aFlags = 0) {
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if (MOZ_UNLIKELY(aCallback.WantDebugInfo())) {
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CycleCollectionNoteEdgeNameImpl(aCallback, aName, aFlags);
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}
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}
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#define NS_CYCLE_COLLECTION_INNERCLASS cycleCollection
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#define NS_CYCLE_COLLECTION_INNERNAME _cycleCollectorGlobal
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#define NS_CYCLE_COLLECTION_PARTICIPANT(_class) \
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_class::NS_CYCLE_COLLECTION_INNERCLASS::GetParticipant()
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template <typename T>
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nsISupports* ToSupports(
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T* aPtr, typename T::NS_CYCLE_COLLECTION_INNERCLASS* aDummy = 0) {
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return T::NS_CYCLE_COLLECTION_INNERCLASS::Upcast(aPtr);
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}
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// The default implementation of this class template is empty, because it
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// should never be used: see the partial specializations below.
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template <typename T, bool IsXPCOM = std::is_base_of<nsISupports, T>::value>
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struct CycleCollectionNoteChildImpl {};
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template <typename T>
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struct CycleCollectionNoteChildImpl<T, true> {
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static void Run(nsCycleCollectionTraversalCallback& aCallback, T* aChild) {
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aCallback.NoteXPCOMChild(ToSupports(aChild));
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}
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};
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template <typename T>
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struct CycleCollectionNoteChildImpl<T, false> {
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static void Run(nsCycleCollectionTraversalCallback& aCallback, T* aChild) {
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aCallback.NoteNativeChild(aChild, NS_CYCLE_COLLECTION_PARTICIPANT(T));
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}
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};
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// We declare CycleCollectionNoteChild in 3-argument and 4-argument variants,
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// rather than using default arguments, so that forward declarations work
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// regardless of header inclusion order.
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template <typename T>
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inline void CycleCollectionNoteChild(
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nsCycleCollectionTraversalCallback& aCallback, T* aChild, const char* aName,
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uint32_t aFlags) {
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CycleCollectionNoteEdgeName(aCallback, aName, aFlags);
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CycleCollectionNoteChildImpl<T>::Run(aCallback, aChild);
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}
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template <typename T>
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inline void CycleCollectionNoteChild(
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nsCycleCollectionTraversalCallback& aCallback, T* aChild,
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const char* aName) {
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CycleCollectionNoteChild(aCallback, aChild, aName, 0);
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}
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#endif // nsCycleCollectionNoteChild_h__
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