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338 lines
22 KiB
C++
338 lines
22 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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#ifndef nsAgg_h___
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#define nsAgg_h___
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#include "nsISupports.h"
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#include "nsCycleCollectionParticipant.h"
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////////////////////////////////////////////////////////////////////////////////
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// Put NS_DECL_AGGREGATED or NS_DECL_CYCLE_COLLECTING_AGGREGATED in your class's
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// declaration.
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#define NS_DECL_AGGREGATED \
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NS_DECL_ISUPPORTS \
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NS_DECL_AGGREGATED_HELPER
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#define NS_DECL_CYCLE_COLLECTING_AGGREGATED \
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS \
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NS_DECL_AGGREGATED_HELPER
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#define NS_DECL_AGGREGATED_HELPER \
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public: \
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\
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/** \
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* Returns the nsISupports pointer of the inner object (aka the \
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* aggregatee). This pointer is really only useful to the outer object \
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* (aka the aggregator), which can use it to hold on to the inner \
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* object. Anything else wants the nsISupports pointer of the outer \
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* object (gotten by QI'ing inner or outer to nsISupports). This method \
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* returns a non-addrefed pointer. \
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* @return the nsISupports pointer of the inner object \
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*/ \
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nsISupports* InnerObject(void) { return &fAggregated; } \
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\
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/** \
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* Returns true if this object is part of an aggregated object. \
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*/ \
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bool IsPartOfAggregated(void) { return fOuter != InnerObject(); } \
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\
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private: \
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\
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/* You must implement this operation instead of the nsISupports */ \
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/* methods. */ \
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nsresult \
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AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr); \
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\
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class Internal : public nsISupports { \
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public: \
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\
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Internal() {} \
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\
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NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr); \
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NS_IMETHOD_(MozExternalRefCountType) AddRef(void); \
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NS_IMETHOD_(MozExternalRefCountType) Release(void); \
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\
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NS_DECL_OWNINGTHREAD \
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}; \
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\
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friend class Internal; \
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\
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nsISupports* MOZ_UNSAFE_REF("fOuter can either point to fAggregated " \
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"or to an outer object, and the safety " \
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"of this reference depends on the exact " \
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"lifetime semantics of the AddRef/Release " \
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"functions created by these macros.") \
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fOuter; \
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Internal fAggregated; \
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\
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public: \
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#define NS_DECL_AGGREGATED_CYCLE_COLLECTION_CLASS(_class) \
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class NS_CYCLE_COLLECTION_INNERCLASS \
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: public nsXPCOMCycleCollectionParticipant \
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{ \
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public: \
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NS_IMETHOD_(void) Unlink(void *p); \
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NS_IMETHOD Traverse(void *p, nsCycleCollectionTraversalCallback &cb); \
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NS_IMETHOD_(void) DeleteCycleCollectable(void* p) \
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{ \
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NS_CYCLE_COLLECTION_CLASSNAME(_class):: \
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Downcast(static_cast<nsISupports*>(p))->DeleteCycleCollectable(); \
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} \
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static _class* Downcast(nsISupports* s) \
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{ \
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return (_class*)((char*)(s) - offsetof(_class, fAggregated)); \
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} \
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static nsISupports* Upcast(_class *p) \
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{ \
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return p->InnerObject(); \
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} \
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static nsXPCOMCycleCollectionParticipant* GetParticipant() \
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{ \
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return &_class::NS_CYCLE_COLLECTION_INNERNAME; \
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} \
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}; \
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NS_CHECK_FOR_RIGHT_PARTICIPANT_IMPL(_class); \
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static NS_CYCLE_COLLECTION_INNERCLASS NS_CYCLE_COLLECTION_INNERNAME;
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// Put this in your class's constructor:
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#define NS_INIT_AGGREGATED(outer) \
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PR_BEGIN_MACRO \
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fOuter = outer ? outer : &fAggregated; \
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PR_END_MACRO
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// Put this in your class's implementation file:
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#define NS_IMPL_AGGREGATED(_class) \
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\
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NS_IMPL_AGGREGATED_HELPER(_class) \
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\
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NS_IMETHODIMP_(MozExternalRefCountType) \
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_class::Internal::AddRef(void) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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MOZ_ASSERT(int32_t(agg->mRefCnt) >= 0, "illegal refcnt"); \
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NS_ASSERT_OWNINGTHREAD(_class); \
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++agg->mRefCnt; \
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NS_LOG_ADDREF(this, agg->mRefCnt, #_class, sizeof(*this)); \
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return agg->mRefCnt; \
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} \
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\
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NS_IMETHODIMP_(MozExternalRefCountType) \
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_class::Internal::Release(void) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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MOZ_ASSERT(int32_t(agg->mRefCnt) > 0, "dup release"); \
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NS_ASSERT_OWNINGTHREAD(_class); \
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--agg->mRefCnt; \
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NS_LOG_RELEASE(this, agg->mRefCnt, #_class); \
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if (agg->mRefCnt == 0) { \
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agg->mRefCnt = 1; /* stabilize */ \
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delete agg; \
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return 0; \
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} \
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return agg->mRefCnt; \
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} \
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#define NS_IMPL_CYCLE_COLLECTING_AGGREGATED(_class) \
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\
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NS_IMPL_AGGREGATED_HELPER(_class) \
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\
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NS_IMETHODIMP_(MozExternalRefCountType) \
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_class::Internal::AddRef(void) \
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{ \
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_class* agg = NS_CYCLE_COLLECTION_CLASSNAME(_class)::Downcast(this); \
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MOZ_ASSERT(int32_t(agg->mRefCnt) >= 0, "illegal refcnt"); \
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NS_ASSERT_OWNINGTHREAD_AGGREGATE(agg, _class); \
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nsrefcnt count = agg->mRefCnt.incr(this); \
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NS_LOG_ADDREF(this, count, #_class, sizeof(*agg)); \
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return count; \
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} \
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NS_IMETHODIMP_(MozExternalRefCountType) \
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_class::Internal::Release(void) \
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{ \
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_class* agg = NS_CYCLE_COLLECTION_CLASSNAME(_class)::Downcast(this); \
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MOZ_ASSERT(int32_t(agg->mRefCnt) > 0, "dup release"); \
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NS_ASSERT_OWNINGTHREAD_AGGREGATE(agg, _class); \
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nsrefcnt count = agg->mRefCnt.decr(this); \
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NS_LOG_RELEASE(this, count, #_class); \
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return count; \
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} \
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NS_IMETHODIMP_(void) \
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_class::DeleteCycleCollectable(void) \
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{ \
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delete this; \
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}
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#define NS_IMPL_AGGREGATED_HELPER(_class) \
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NS_IMETHODIMP \
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_class::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
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{ \
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return fOuter->QueryInterface(aIID, aInstancePtr); \
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} \
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\
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NS_IMETHODIMP_(MozExternalRefCountType) \
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_class::AddRef(void) \
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{ \
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return fOuter->AddRef(); \
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} \
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\
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NS_IMETHODIMP_(MozExternalRefCountType) \
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_class::Release(void) \
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{ \
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return fOuter->Release(); \
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} \
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\
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NS_IMETHODIMP \
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_class::Internal::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
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{ \
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_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
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return agg->AggregatedQueryInterface(aIID, aInstancePtr); \
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} \
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/**
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* To make aggregated objects participate in cycle collection we need to enable
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* the outer object (aggregator) to traverse/unlink the objects held by the
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* inner object (the aggregatee). We can't just make the inner object QI'able to
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* NS_CYCLECOLLECTIONPARTICIPANT_IID, we don't want to return the inner object's
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* nsCycleCollectionParticipant for the outer object (which will happen if the
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* outer object doesn't participate in cycle collection itself).
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* NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID enables the outer object to get
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* the inner objects nsCycleCollectionParticipant.
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*
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* There are three cases:
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* - No aggregation
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* QI'ing to NS_CYCLECOLLECTIONPARTICIPANT_IID will return the inner
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* object's nsCycleCollectionParticipant.
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*
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* - Aggregation and outer object does not participate in cycle collection
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* QI'ing to NS_CYCLECOLLECTIONPARTICIPANT_IID will not return anything.
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*
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* - Aggregation and outer object does participate in cycle collection
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* QI'ing to NS_CYCLECOLLECTIONPARTICIPANT_IID will return the outer
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* object's nsCycleCollectionParticipant. The outer object's
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* nsCycleCollectionParticipant can then QI the inner object to
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* NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID to get the inner object's
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* nsCycleCollectionParticipant, which it can use to traverse/unlink the
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* objects reachable from the inner object.
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*/
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#define NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID \
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{ \
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0x32889b7e, \
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0xe4fe, \
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0x43f4, \
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{ 0x85, 0x31, 0xb5, 0x28, 0x23, 0xa2, 0xe9, 0xfc } \
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}
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/**
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* Just holds the IID so NS_GET_IID works.
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*/
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class nsAggregatedCycleCollectionParticipant
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID)
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsAggregatedCycleCollectionParticipant,
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NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID)
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// for use with QI macros in nsISupportsUtils.h:
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#define NS_INTERFACE_MAP_BEGIN_AGGREGATED(_class) \
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NS_IMPL_AGGREGATED_QUERY_HEAD(_class)
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#define NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_AGGREGATED(_class) \
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NS_IMPL_QUERY_CYCLE_COLLECTION(_class)
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#define NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION_AGGREGATED(_class) \
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NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_AGGREGATED(_class) \
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NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_ISUPPORTS(_class)
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#define NS_IMPL_AGGREGATED_QUERY_HEAD(_class) \
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nsresult \
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_class::AggregatedQueryInterface(REFNSIID aIID, void** aInstancePtr) \
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{ \
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NS_ASSERTION(aInstancePtr, \
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"AggregatedQueryInterface requires a non-NULL result ptr!"); \
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if ( !aInstancePtr ) \
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return NS_ERROR_NULL_POINTER; \
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nsISupports* foundInterface; \
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if ( aIID.Equals(NS_GET_IID(nsISupports)) ) \
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foundInterface = InnerObject(); \
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else
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#define NS_IMPL_AGGREGATED_QUERY_CYCLE_COLLECTION(_class) \
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if (aIID.Equals(IsPartOfAggregated() ? \
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NS_GET_IID(nsCycleCollectionParticipant) : \
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NS_GET_IID(nsAggregatedCycleCollectionParticipant))) \
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foundInterface = NS_CYCLE_COLLECTION_PARTICIPANT(_class); \
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else
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#define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_AGGREGATED(_class) \
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NS_IMETHODIMP \
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NS_CYCLE_COLLECTION_CLASSNAME(_class)::Traverse \
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(void *p, nsCycleCollectionTraversalCallback &cb) \
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{ \
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nsISupports *s = static_cast<nsISupports*>(p); \
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MOZ_ASSERT(CheckForRightISupports(s), \
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"not the nsISupports pointer we expect"); \
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_class *tmp = static_cast<_class*>(Downcast(s)); \
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if (!tmp->IsPartOfAggregated()) \
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NS_IMPL_CYCLE_COLLECTION_DESCRIBE(_class, tmp->mRefCnt.get())
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#define NS_GENERIC_AGGREGATED_CONSTRUCTOR(_InstanceClass) \
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static nsresult \
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_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \
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void **aResult) \
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{ \
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*aResult = nullptr; \
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if (NS_WARN_IF(aOuter && !aIID.Equals(NS_GET_IID(nsISupports)))) \
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return NS_ERROR_INVALID_ARG; \
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\
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_InstanceClass* inst = new _InstanceClass(aOuter); \
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if (!inst) { \
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return NS_ERROR_OUT_OF_MEMORY; \
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} \
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\
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nsISupports* inner = inst->InnerObject(); \
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nsresult rv = inner->QueryInterface(aIID, aResult); \
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if (NS_FAILED(rv)) { \
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delete inst; \
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} \
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\
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return rv; \
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} \
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#define NS_GENERIC_AGGREGATED_CONSTRUCTOR_INIT(_InstanceClass, _InitMethod) \
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static nsresult \
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_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \
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void **aResult) \
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{ \
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*aResult = nullptr; \
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if (NS_WARN_IF(aOuter && !aIID.Equals(NS_GET_IID(nsISupports)))) \
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return NS_ERROR_INVALID_ARG; \
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\
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_InstanceClass* inst = new _InstanceClass(aOuter); \
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if (!inst) { \
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return NS_ERROR_OUT_OF_MEMORY; \
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} \
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\
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nsISupports* inner = inst->InnerObject(); \
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NS_ADDREF(inner); \
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nsresult rv = inst->_InitMethod(); \
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if (NS_SUCCEEDED(rv)) { \
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rv = inner->QueryInterface(aIID, aResult); \
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} \
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NS_RELEASE(inner); \
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\
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return rv; \
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} \
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#endif /* nsAgg_h___ */
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