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comparison: xpcom/glue/nsCycleCollectionNoteChild.h
xpcom/glue/nsCycleCollectionNoteChild.h
- changeset 0
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 // This header will be included by headers that define refpointer and array classes | |
| 7 // in order to specialize CC helpers such as ImplCycleCollectionTraverse for them. | |
| 8 | |
| 9 #ifndef nsCycleCollectionNoteChild_h__ | |
| 10 #define nsCycleCollectionNoteChild_h__ | |
| 11 | |
| 12 #include "nsCycleCollectionTraversalCallback.h" | |
| 13 #include "mozilla/Likely.h" | |
| 14 #include "mozilla/TypeTraits.h" | |
| 15 | |
| 16 enum { | |
| 17 CycleCollectionEdgeNameArrayFlag = 1 | |
| 18 }; | |
| 19 | |
| 20 // Just a helper for appending "[i]". Didn't want to pull in string headers here. | |
| 21 void | |
| 22 CycleCollectionNoteEdgeNameImpl(nsCycleCollectionTraversalCallback& aCallback, | |
| 23 const char* aName, | |
| 24 uint32_t aFlags = 0); | |
| 25 | |
| 26 // Should be inlined so that in the no-debug-info case this is just a simple if(). | |
| 27 MOZ_ALWAYS_INLINE void | |
| 28 CycleCollectionNoteEdgeName(nsCycleCollectionTraversalCallback& aCallback, | |
| 29 const char* aName, | |
| 30 uint32_t aFlags = 0) | |
| 31 { | |
| 32 if (MOZ_UNLIKELY(aCallback.WantDebugInfo())) { | |
| 33 CycleCollectionNoteEdgeNameImpl(aCallback, aName, aFlags); | |
| 34 } | |
| 35 } | |
| 36 | |
| 37 #define NS_CYCLE_COLLECTION_INNERCLASS \ | |
| 38 cycleCollection | |
| 39 | |
| 40 #define NS_CYCLE_COLLECTION_INNERNAME \ | |
| 41 _cycleCollectorGlobal | |
| 42 | |
| 43 #define NS_CYCLE_COLLECTION_PARTICIPANT(_class) \ | |
| 44 _class::NS_CYCLE_COLLECTION_INNERCLASS::GetParticipant() | |
| 45 | |
| 46 template <typename T> | |
| 47 nsISupports* ToSupports(T* p, typename T::NS_CYCLE_COLLECTION_INNERCLASS* dummy = 0) | |
| 48 { | |
| 49 return T::NS_CYCLE_COLLECTION_INNERCLASS::Upcast(p); | |
| 50 } | |
| 51 | |
| 52 // The default implementation of this class template is empty, because it | |
| 53 // should never be used: see the partial specializations below. | |
| 54 template <typename T, | |
| 55 bool IsXPCOM = mozilla::IsBaseOf<nsISupports, T>::value> | |
| 56 struct CycleCollectionNoteChildImpl | |
| 57 { | |
| 58 }; | |
| 59 | |
| 60 template <typename T> | |
| 61 struct CycleCollectionNoteChildImpl<T, true> | |
| 62 { | |
| 63 static void Run(nsCycleCollectionTraversalCallback& aCallback, T* aChild) | |
| 64 { | |
| 65 aCallback.NoteXPCOMChild(ToSupports(aChild)); | |
| 66 } | |
| 67 }; | |
| 68 | |
| 69 template <typename T> | |
| 70 struct CycleCollectionNoteChildImpl<T, false> | |
| 71 { | |
| 72 static void Run(nsCycleCollectionTraversalCallback& aCallback, T* aChild) | |
| 73 { | |
| 74 aCallback.NoteNativeChild(aChild, NS_CYCLE_COLLECTION_PARTICIPANT(T)); | |
| 75 } | |
| 76 }; | |
| 77 | |
| 78 template <typename T> | |
| 79 inline void CycleCollectionNoteChild(nsCycleCollectionTraversalCallback& aCallback, | |
| 80 T* aChild, | |
| 81 const char* aName, | |
| 82 uint32_t aFlags = 0) | |
| 83 { | |
| 84 CycleCollectionNoteEdgeName(aCallback, aName, aFlags); | |
| 85 CycleCollectionNoteChildImpl<T>::Run(aCallback, aChild); | |
| 86 } | |
| 87 | |
| 88 #endif // nsCycleCollectionNoteChild_h__ |
