/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* 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/. */ #ifndef nsCycleCollectionParticipant_h__ #define nsCycleCollectionParticipant_h__ #include "mozilla/MacroArgs.h" #include "mozilla/MacroForEach.h" #include "nsCycleCollectionNoteChild.h" #include "js/RootingAPI.h" #define NS_XPCOMCYCLECOLLECTIONPARTICIPANT_IID \ { \ 0x9674489b, \ 0x1f6f, \ 0x4550, \ { 0xa7, 0x30, 0xcc, 0xae, 0xdd, 0x10, 0x4c, 0xf9 } \ } /** * Special IID to get at the base nsISupports for a class. Usually this is the * canonical nsISupports pointer, but in the case of tearoffs for example it is * the base nsISupports pointer of the tearoff. This allow the cycle collector * to have separate nsCycleCollectionParticipant's for tearoffs or aggregated * classes. */ #define NS_CYCLECOLLECTIONISUPPORTS_IID \ { \ 0xc61eac14, \ 0x5f7a, \ 0x4481, \ { 0x96, 0x5e, 0x7e, 0xaa, 0x6e, 0xff, 0xa8, 0x5f } \ } /** * Just holds the IID so NS_GET_IID works. */ class nsCycleCollectionISupports { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_CYCLECOLLECTIONISUPPORTS_IID) }; NS_DEFINE_STATIC_IID_ACCESSOR(nsCycleCollectionISupports, NS_CYCLECOLLECTIONISUPPORTS_IID) namespace JS { template class Heap; } /* namespace JS */ /* * A struct defining pure virtual methods which are called when tracing cycle * collection paticipants. The appropriate method is called depending on the * type of JS GC thing. */ struct TraceCallbacks { virtual void Trace(JS::Heap* p, const char* name, void* closure) const = 0; virtual void Trace(JS::Heap* p, const char* name, void* closure) const = 0; virtual void Trace(JS::Heap* p, const char* name, void* closure) const = 0; virtual void Trace(JS::TenuredHeap* p, const char* name, void* closure) const = 0; virtual void Trace(JS::Heap* p, const char* name, void* closure) const = 0; virtual void Trace(JS::Heap* p, const char* name, void* closure) const = 0; virtual void Trace(JS::Heap* p, const char* name, void* closure) const = 0; }; /* * An implementation of TraceCallbacks that calls a single function for all JS * GC thing types encountered. */ struct TraceCallbackFunc : public TraceCallbacks { typedef void (* Func)(void* p, const char* name, void* closure); explicit TraceCallbackFunc(Func cb) : mCallback(cb) {} virtual void Trace(JS::Heap* p, const char* name, void* closure) const MOZ_OVERRIDE; virtual void Trace(JS::Heap* p, const char* name, void* closure) const MOZ_OVERRIDE; virtual void Trace(JS::Heap* p, const char* name, void* closure) const MOZ_OVERRIDE; virtual void Trace(JS::TenuredHeap* p, const char* name, void* closure) const MOZ_OVERRIDE; virtual void Trace(JS::Heap* p, const char* name, void* closure) const MOZ_OVERRIDE; virtual void Trace(JS::Heap* p, const char* name, void* closure) const MOZ_OVERRIDE; virtual void Trace(JS::Heap* p, const char* name, void* closure) const MOZ_OVERRIDE; private: Func mCallback; }; /** * Participant implementation classes */ class NS_NO_VTABLE nsCycleCollectionParticipant { public: MOZ_CONSTEXPR nsCycleCollectionParticipant() : mMightSkip(false) {} MOZ_CONSTEXPR nsCycleCollectionParticipant(bool aSkip) : mMightSkip(aSkip) {} NS_IMETHOD Traverse(void *p, nsCycleCollectionTraversalCallback &cb) = 0; NS_IMETHOD_(void) Root(void *p) = 0; NS_IMETHOD_(void) Unlink(void *p) = 0; NS_IMETHOD_(void) Unroot(void *p) = 0; NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure) {}; // If CanSkip returns true, p is removed from the purple buffer during // a call to nsCycleCollector_forgetSkippable(). // Note, calling CanSkip may remove objects from the purple buffer! // If aRemovingAllowed is true, p can be removed from the purple buffer. bool CanSkip(void *p, bool aRemovingAllowed) { return mMightSkip ? CanSkipReal(p, aRemovingAllowed) : false; } // If CanSkipInCC returns true, p is skipped when selecting roots for the // cycle collector graph. // Note, calling CanSkipInCC may remove other objects from the purple buffer! bool CanSkipInCC(void *p) { return mMightSkip ? CanSkipInCCReal(p) : false; } // If CanSkipThis returns true, p is not added to the graph. // This method is called during cycle collection, so don't // change the state of any objects! bool CanSkipThis(void *p) { return mMightSkip ? CanSkipThisReal(p) : false; } NS_IMETHOD_(void) DeleteCycleCollectable(void *n) = 0; protected: NS_IMETHOD_(bool) CanSkipReal(void *p, bool aRemovingAllowed) { NS_ASSERTION(false, "Forgot to implement CanSkipReal?"); return false; } NS_IMETHOD_(bool) CanSkipInCCReal(void *p) { NS_ASSERTION(false, "Forgot to implement CanSkipInCCReal?"); return false; } NS_IMETHOD_(bool) CanSkipThisReal(void *p) { NS_ASSERTION(false, "Forgot to implement CanSkipThisReal?"); return false; } private: const bool mMightSkip; }; class NS_NO_VTABLE nsScriptObjectTracer : public nsCycleCollectionParticipant { public: MOZ_CONSTEXPR nsScriptObjectTracer() : nsCycleCollectionParticipant(false) {} MOZ_CONSTEXPR nsScriptObjectTracer(bool aSkip) : nsCycleCollectionParticipant(aSkip) {} NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure) = 0; static void NS_COM_GLUE NoteJSChild(void *aScriptThing, const char *name, void *aClosure); }; class NS_NO_VTABLE nsXPCOMCycleCollectionParticipant : public nsScriptObjectTracer { public: MOZ_CONSTEXPR nsXPCOMCycleCollectionParticipant() : nsScriptObjectTracer(false) {} MOZ_CONSTEXPR nsXPCOMCycleCollectionParticipant(bool aSkip) : nsScriptObjectTracer(aSkip) {} NS_DECLARE_STATIC_IID_ACCESSOR(NS_XPCOMCYCLECOLLECTIONPARTICIPANT_IID) NS_IMETHOD_(void) Root(void *p); NS_IMETHOD_(void) Unroot(void *p); NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure); static bool CheckForRightISupports(nsISupports *s); }; NS_DEFINE_STATIC_IID_ACCESSOR(nsXPCOMCycleCollectionParticipant, NS_XPCOMCYCLECOLLECTIONPARTICIPANT_IID) /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing a QI to nsXPCOMCycleCollectionParticipant /////////////////////////////////////////////////////////////////////////////// #define NS_CYCLE_COLLECTION_CLASSNAME(_class) \ _class::NS_CYCLE_COLLECTION_INNERCLASS #define NS_IMPL_QUERY_CYCLE_COLLECTION(_class) \ if ( aIID.Equals(NS_GET_IID(nsXPCOMCycleCollectionParticipant)) ) { \ *aInstancePtr = NS_CYCLE_COLLECTION_PARTICIPANT(_class); \ return NS_OK; \ } else #define NS_IMPL_QUERY_CYCLE_COLLECTION_ISUPPORTS(_class) \ if ( aIID.Equals(NS_GET_IID(nsCycleCollectionISupports)) ) { \ *aInstancePtr = NS_CYCLE_COLLECTION_CLASSNAME(_class)::Upcast(this); \ return NS_OK; \ } else #define NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION(_class) \ NS_IMPL_QUERY_CYCLE_COLLECTION(_class) #define NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_ISUPPORTS(_class) \ NS_IMPL_QUERY_CYCLE_COLLECTION_ISUPPORTS(_class) #define NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(_class) \ NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION(_class) \ NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_ISUPPORTS(_class) #define NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(_class) \ NS_INTERFACE_MAP_BEGIN(_class) \ NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(_class) #define NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(_class) \ NS_INTERFACE_MAP_BEGIN(_class) \ NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION(_class) #define NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(_class) \ if (rv == NS_OK) return rv; \ nsISupports* foundInterface; \ NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(_class) #define NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(_class) \ NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \ { \ NS_PRECONDITION(aInstancePtr, "null out param"); \ \ if ( aIID.Equals(NS_GET_IID(nsXPCOMCycleCollectionParticipant)) ) { \ *aInstancePtr = NS_CYCLE_COLLECTION_PARTICIPANT(_class); \ return NS_OK; \ } \ nsresult rv; #define NS_CYCLE_COLLECTION_UPCAST(obj, clazz) \ NS_CYCLE_COLLECTION_CLASSNAME(clazz)::Upcast(obj) #ifdef DEBUG #define NS_CHECK_FOR_RIGHT_PARTICIPANT(_ptr) _ptr->CheckForRightParticipant() #else #define NS_CHECK_FOR_RIGHT_PARTICIPANT(_ptr) #endif // The default implementation of this class template is empty, because it // should never be used: see the partial specializations below. template ::value> struct DowncastCCParticipantImpl { }; // Specialization for XPCOM CC participants template struct DowncastCCParticipantImpl { static T* Run(void *p) { nsISupports *s = static_cast(p); MOZ_ASSERT(NS_CYCLE_COLLECTION_CLASSNAME(T)::CheckForRightISupports(s), "not the nsISupports pointer we expect"); T *rval = NS_CYCLE_COLLECTION_CLASSNAME(T)::Downcast(s); NS_CHECK_FOR_RIGHT_PARTICIPANT(rval); return rval; } }; // Specialization for native CC participants template struct DowncastCCParticipantImpl { static T* Run(void *p) { return static_cast(p); } }; template T* DowncastCCParticipant(void *p) { return DowncastCCParticipantImpl::Run(p); } /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing CanSkip methods /////////////////////////////////////////////////////////////////////////////// #define NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(_class) \ NS_IMETHODIMP_(bool) \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::CanSkipReal(void *p, \ bool aRemovingAllowed) \ { \ _class *tmp = DowncastCCParticipant<_class >(p); #define NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END \ (void)tmp; \ return false; \ } #define NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(_class) \ NS_IMETHODIMP_(bool) \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::CanSkipInCCReal(void *p) \ { \ _class *tmp = DowncastCCParticipant<_class >(p); #define NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END \ (void)tmp; \ return false; \ } #define NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(_class) \ NS_IMETHODIMP_(bool) \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::CanSkipThisReal(void *p) \ { \ _class *tmp = DowncastCCParticipant<_class >(p); #define NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END \ (void)tmp; \ return false; \ } /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing nsCycleCollectionParticipant::Unlink // // You need to use NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED if you want // the base class Unlink version to be called before your own implementation. // You can use NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED if you want the // base class Unlink to get called after your own implementation. You should // never use them together. /////////////////////////////////////////////////////////////////////////////// #define NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class) \ NS_IMETHODIMP_(void) \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::Unlink(void *p) \ { \ _class *tmp = DowncastCCParticipant<_class >(p); #define NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(_class, _base_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class) \ nsISupports *s = static_cast(p); \ NS_CYCLE_COLLECTION_CLASSNAME(_base_class)::Unlink(s); #define NS_IMPL_CYCLE_COLLECTION_UNLINK_HELPER(_field) \ ImplCycleCollectionUnlink(tmp->_field); #define NS_IMPL_CYCLE_COLLECTION_UNLINK(...) \ MOZ_STATIC_ASSERT_VALID_ARG_COUNT(__VA_ARGS__); \ MOZ_FOR_EACH(NS_IMPL_CYCLE_COLLECTION_UNLINK_HELPER, (), (__VA_ARGS__)) #define NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ (void)tmp; \ } #define NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(_base_class) \ nsISupports *s = static_cast(p); \ NS_CYCLE_COLLECTION_CLASSNAME(_base_class)::Unlink(s); \ (void)tmp; \ } #define NS_IMPL_CYCLE_COLLECTION_UNLINK_0(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing nsCycleCollectionParticipant::Traverse /////////////////////////////////////////////////////////////////////////////// #define NS_IMPL_CYCLE_COLLECTION_DESCRIBE(_class, _refcnt) \ cb.DescribeRefCountedNode(_refcnt, #_class); #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(_class) \ NS_IMETHODIMP \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::Traverse \ (void *p, nsCycleCollectionTraversalCallback &cb) \ { \ _class *tmp = DowncastCCParticipant<_class >(p); #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(_class) \ NS_IMPL_CYCLE_COLLECTION_DESCRIBE(_class, tmp->mRefCnt.get()) // Base class' CC participant should return NS_SUCCESS_INTERRUPTED_TRAVERSE // from Traverse if it wants derived classes to not traverse anything from // their CC participant. #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(_class, _base_class) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(_class) \ nsISupports *s = static_cast(p); \ if (NS_CYCLE_COLLECTION_CLASSNAME(_base_class)::Traverse(s, cb) \ == NS_SUCCESS_INTERRUPTED_TRAVERSE) { \ return NS_SUCCESS_INTERRUPTED_TRAVERSE; \ } #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_HELPER(_field) \ ImplCycleCollectionTraverse(cb, tmp->_field, #_field, 0); #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE(...) \ MOZ_STATIC_ASSERT_VALID_ARG_COUNT(__VA_ARGS__); \ MOZ_FOR_EACH(NS_IMPL_CYCLE_COLLECTION_TRAVERSE_HELPER, (), (__VA_ARGS__)) #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(_field) \ CycleCollectionNoteChild(cb, tmp->_field, #_field); #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS \ { \ TraceCallbackFunc noteJsChild(&nsScriptObjectTracer::NoteJSChild); \ Trace(p, noteJsChild, &cb); \ } #define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END \ (void)tmp; \ return NS_OK; \ } /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing nsScriptObjectTracer::Trace /////////////////////////////////////////////////////////////////////////////// #define NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(_class) \ void \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::Trace(void *p, \ const TraceCallbacks &aCallbacks, \ void *aClosure) \ { \ _class *tmp = DowncastCCParticipant<_class >(p); #define NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(_class, _base_class) \ NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(_class) \ nsISupports *s = static_cast(p); \ NS_CYCLE_COLLECTION_CLASSNAME(_base_class)::Trace(s, aCallbacks, aClosure); #define NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(_field) \ if (tmp->_field) \ aCallbacks.Trace(&tmp->_field, #_field, aClosure); #define NS_IMPL_CYCLE_COLLECTION_TRACE_JSVAL_MEMBER_CALLBACK(_field) \ aCallbacks.Trace(&tmp->_field, #_field, aClosure); // NB: The (void)tmp; hack in the TRACE_END macro exists to support // implementations that don't need to do anything in their Trace method. // Without this hack, some compilers warn about the unused tmp local. #define NS_IMPL_CYCLE_COLLECTION_TRACE_END \ (void)tmp; \ } /////////////////////////////////////////////////////////////////////////////// // Helpers for implementing a concrete nsCycleCollectionParticipant /////////////////////////////////////////////////////////////////////////////// // If a class defines a participant, then QIing an instance of that class to // nsXPCOMCycleCollectionParticipant should produce that participant. #ifdef DEBUG #define NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ virtual void CheckForRightParticipant() \ { \ nsXPCOMCycleCollectionParticipant *p; \ CallQueryInterface(this, &p); \ MOZ_ASSERT(p == &NS_CYCLE_COLLECTION_INNERNAME, \ #_class " should QI to its own CC participant"); \ } #else #define NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) #endif #define NS_DECL_CYCLE_COLLECTION_CLASS_BODY_NO_UNLINK(_class, _base) \ public: \ NS_IMETHOD Traverse(void *p, nsCycleCollectionTraversalCallback &cb); \ NS_IMETHOD_(void) DeleteCycleCollectable(void *p) \ { \ DowncastCCParticipant<_class>(p)->DeleteCycleCollectable(); \ } \ static _class* Downcast(nsISupports* s) \ { \ return static_cast<_class*>(static_cast<_base*>(s)); \ } \ static nsISupports* Upcast(_class *p) \ { \ return NS_ISUPPORTS_CAST(_base*, p); \ } \ template \ friend nsISupports* \ ToSupports(T* p, NS_CYCLE_COLLECTION_INNERCLASS* dummy); #define NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \ NS_DECL_CYCLE_COLLECTION_CLASS_BODY_NO_UNLINK(_class, _base) \ NS_IMETHOD_(void) Unlink(void *p); #define NS_PARTICIPANT_AS(type, participant) \ const_cast(reinterpret_cast(participant)) #define NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ static MOZ_CONSTEXPR nsXPCOMCycleCollectionParticipant* GetParticipant() \ { \ return &_class::NS_CYCLE_COLLECTION_INNERNAME; \ } /** * We use this macro to force that classes that inherit from a ccable class and * declare their own participant declare themselves as inherited cc classes. * To avoid possibly unnecessary vtables we only do this checking in debug * builds. */ #ifdef DEBUG #define NOT_INHERITED_CANT_OVERRIDE virtual void BaseCycleCollectable() MOZ_FINAL {} #else #define NOT_INHERITED_CANT_OVERRIDE #endif #define NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(_class, _base) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public nsXPCOMCycleCollectionParticipant \ { \ NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \ NOT_INHERITED_CANT_OVERRIDE #define NS_DECL_CYCLE_COLLECTION_CLASS(_class) \ NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(_class, _class) // Cycle collector helper for ambiguous classes that can sometimes be skipped. #define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_CLASS_AMBIGUOUS(_class, _base) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public nsXPCOMCycleCollectionParticipant \ { \ public: \ MOZ_CONSTEXPR NS_CYCLE_COLLECTION_INNERCLASS () \ : nsXPCOMCycleCollectionParticipant(true) {} \ private: \ NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \ NS_IMETHOD_(bool) CanSkipReal(void *p, bool aRemovingAllowed); \ NS_IMETHOD_(bool) CanSkipInCCReal(void *p); \ NS_IMETHOD_(bool) CanSkipThisReal(void *p); \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \ NOT_INHERITED_CANT_OVERRIDE #define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_CLASS(_class) \ NS_DECL_CYCLE_COLLECTION_SKIPPABLE_CLASS_AMBIGUOUS(_class, _class) #define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(_class, _base) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public nsXPCOMCycleCollectionParticipant \ { \ NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \ NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure); \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \ NOT_INHERITED_CANT_OVERRIDE #define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_AMBIGUOUS(_class, _base) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public nsXPCOMCycleCollectionParticipant \ { \ public: \ MOZ_CONSTEXPR NS_CYCLE_COLLECTION_INNERCLASS () \ : nsXPCOMCycleCollectionParticipant(true) {} \ private: \ NS_DECL_CYCLE_COLLECTION_CLASS_BODY(_class, _base) \ NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure); \ NS_IMETHOD_(bool) CanSkipReal(void *p, bool aRemovingAllowed); \ NS_IMETHOD_(bool) CanSkipInCCReal(void *p); \ NS_IMETHOD_(bool) CanSkipThisReal(void *p); \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; \ NOT_INHERITED_CANT_OVERRIDE #define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(_class) \ NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_AMBIGUOUS(_class, _class) #define NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_INHERITED(_class, \ _base_class) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) \ { \ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \ NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure); \ NS_IMETHOD_(bool) CanSkipReal(void *p, bool aRemovingAllowed); \ NS_IMETHOD_(bool) CanSkipInCCReal(void *p); \ NS_IMETHOD_(bool) CanSkipThisReal(void *p); \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; #define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(_class) \ NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(_class, _class) #define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY_NO_UNLINK(_class, \ _base_class) \ public: \ NS_IMETHOD Traverse(void *p, nsCycleCollectionTraversalCallback &cb); \ static _class* Downcast(nsISupports* s) \ { \ return static_cast<_class*>(static_cast<_base_class*>( \ NS_CYCLE_COLLECTION_CLASSNAME(_base_class)::Downcast(s))); \ } #define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY_NO_UNLINK(_class, _base_class) \ NS_IMETHOD_(void) Unlink(void *p); #define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(_class, _base_class) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) \ { \ public: \ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; #define NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_NO_UNLINK(_class, \ _base_class) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) \ { \ public: \ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY_NO_UNLINK(_class, _base_class) \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; #define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(_class, \ _base_class) \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public NS_CYCLE_COLLECTION_CLASSNAME(_base_class) \ { \ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED_BODY(_class, _base_class) \ NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure); \ NS_IMPL_GET_XPCOM_CYCLE_COLLECTION_PARTICIPANT(_class) \ }; \ NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class) \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; // Cycle collector participant declarations. #define NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS_BODY(_class) \ public: \ NS_IMETHOD_(void) Root(void *n); \ NS_IMETHOD_(void) Unlink(void *n); \ NS_IMETHOD_(void) Unroot(void *n); \ NS_IMETHOD Traverse(void *n, nsCycleCollectionTraversalCallback &cb); \ NS_IMETHOD_(void) DeleteCycleCollectable(void *n) \ { \ DowncastCCParticipant<_class>(n)->DeleteCycleCollectable(); \ } \ static _class* Downcast(void* s) \ { \ return DowncastCCParticipant<_class>(s); \ } \ static void* Upcast(_class *p) \ { \ return static_cast(p); \ } #define NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(_class) \ void DeleteCycleCollectable(void) \ { \ delete this; \ } \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public nsCycleCollectionParticipant \ { \ NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS_BODY(_class) \ static MOZ_CONSTEXPR nsCycleCollectionParticipant* GetParticipant() \ { \ return &_class::NS_CYCLE_COLLECTION_INNERNAME; \ } \ }; \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; #define NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(_class) \ void DeleteCycleCollectable(void) \ { \ delete this; \ } \ class NS_CYCLE_COLLECTION_INNERCLASS \ : public nsScriptObjectTracer \ { \ NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS_BODY(_class) \ NS_IMETHOD_(void) Trace(void *p, const TraceCallbacks &cb, void *closure); \ static MOZ_CONSTEXPR nsScriptObjectTracer* GetParticipant() \ { \ return &_class::NS_CYCLE_COLLECTION_INNERNAME; \ } \ }; \ static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME; #define NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(_class, _root_function) \ NS_IMETHODIMP_(void) \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::Root(void *p) \ { \ _class *tmp = static_cast<_class*>(p); \ tmp->_root_function(); \ } #define NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(_class, _unroot_function) \ NS_IMETHODIMP_(void) \ NS_CYCLE_COLLECTION_CLASSNAME(_class)::Unroot(void *p) \ { \ _class *tmp = static_cast<_class*>(p); \ tmp->_unroot_function(); \ } #define NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ _class::NS_CYCLE_COLLECTION_INNERCLASS _class::NS_CYCLE_COLLECTION_INNERNAME; // NB: This is not something you usually want to use. It is here to allow // adding things to the CC graph to help debugging via CC logs, but it does not // traverse or unlink anything, so it is useless for anything else. #define NS_IMPL_CYCLE_COLLECTION_0(_class) \ NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END #define NS_IMPL_CYCLE_COLLECTION(_class, ...) \ NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(_class) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END #define NS_IMPL_CYCLE_COLLECTION_INHERITED(_class, _base, ...) \ NS_IMPL_CYCLE_COLLECTION_CLASS(_class) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_UNLINK(__VA_ARGS__) \ NS_IMPL_CYCLE_COLLECTION_UNLINK_END \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(_class, _base) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(__VA_ARGS__) \ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END #define NS_CYCLE_COLLECTION_NOTE_EDGE_NAME CycleCollectionNoteEdgeName #endif // nsCycleCollectionParticipant_h__