mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 20:47:44 +00:00
363 lines
23 KiB
C++
363 lines
23 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 1998
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either of the GNU General Public License Version 2 or later (the "GPL"),
|
|
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#ifndef nsAgg_h___
|
|
#define nsAgg_h___
|
|
|
|
#include "nsISupports.h"
|
|
#include "nsCycleCollectionParticipant.h"
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
// Put NS_DECL_AGGREGATED or NS_DECL_CYCLE_COLLECTING_AGGREGATED in your class's
|
|
// declaration.
|
|
#define NS_DECL_AGGREGATED \
|
|
NS_DECL_ISUPPORTS \
|
|
NS_DECL_AGGREGATED_HELPER
|
|
|
|
#define NS_DECL_CYCLE_COLLECTING_AGGREGATED \
|
|
NS_DECL_CYCLE_COLLECTING_ISUPPORTS \
|
|
NS_DECL_AGGREGATED_HELPER
|
|
|
|
#define NS_DECL_AGGREGATED_HELPER \
|
|
public: \
|
|
\
|
|
/** \
|
|
* Returns the nsISupports pointer of the inner object (aka the \
|
|
* aggregatee). This pointer is really only useful to the outer object \
|
|
* (aka the aggregator), which can use it to hold on to the inner \
|
|
* object. Anything else wants the nsISupports pointer of the outer \
|
|
* object (gotten by QI'ing inner or outer to nsISupports). This method \
|
|
* returns a non-addrefed pointer. \
|
|
* @return the nsISupports pointer of the inner object \
|
|
*/ \
|
|
nsISupports* InnerObject(void) { return &fAggregated; } \
|
|
\
|
|
/** \
|
|
* Returns true if this object is part of an aggregated object. \
|
|
*/ \
|
|
bool IsPartOfAggregated(void) { return fOuter != InnerObject(); } \
|
|
\
|
|
private: \
|
|
\
|
|
/* You must implement this operation instead of the nsISupports */ \
|
|
/* methods. */ \
|
|
nsresult \
|
|
AggregatedQueryInterface(const nsIID& aIID, void** aInstancePtr); \
|
|
\
|
|
class Internal : public nsISupports { \
|
|
public: \
|
|
\
|
|
Internal() {} \
|
|
\
|
|
NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr); \
|
|
NS_IMETHOD_(nsrefcnt) AddRef(void); \
|
|
NS_IMETHOD_(nsrefcnt) Release(void); \
|
|
\
|
|
NS_DECL_OWNINGTHREAD \
|
|
}; \
|
|
\
|
|
friend class Internal; \
|
|
\
|
|
nsISupports* fOuter; \
|
|
Internal fAggregated; \
|
|
\
|
|
public: \
|
|
|
|
#define NS_DECL_AGGREGATED_CYCLE_COLLECTION_CLASS(_class) \
|
|
class NS_CYCLE_COLLECTION_INNERCLASS \
|
|
: public nsXPCOMCycleCollectionParticipant \
|
|
{ \
|
|
public: \
|
|
NS_IMETHOD Unlink(void *p); \
|
|
NS_IMETHOD Traverse(void *p, \
|
|
nsCycleCollectionTraversalCallback &cb); \
|
|
NS_IMETHOD_(void) UnmarkPurple(nsISupports *p) \
|
|
{ \
|
|
Downcast(p)->UnmarkPurple(); \
|
|
} \
|
|
static _class* Downcast(nsISupports* s) \
|
|
{ \
|
|
return (_class*)((char*)(s) - offsetof(_class, fAggregated)); \
|
|
} \
|
|
static nsISupports* Upcast(_class *p) \
|
|
{ \
|
|
return p->InnerObject(); \
|
|
} \
|
|
}; \
|
|
NS_CYCLE_COLLECTION_PARTICIPANT_INSTANCE
|
|
|
|
// Put this in your class's constructor:
|
|
#define NS_INIT_AGGREGATED(outer) \
|
|
PR_BEGIN_MACRO \
|
|
fOuter = outer ? outer : &fAggregated; \
|
|
PR_END_MACRO
|
|
|
|
|
|
// Put this in your class's implementation file:
|
|
#define NS_IMPL_AGGREGATED(_class) \
|
|
\
|
|
NS_IMPL_AGGREGATED_HELPER(_class) \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Internal::AddRef(void) \
|
|
{ \
|
|
_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
|
|
NS_PRECONDITION(PRInt32(agg->mRefCnt) >= 0, "illegal refcnt"); \
|
|
NS_ASSERT_OWNINGTHREAD(_class); \
|
|
++agg->mRefCnt; \
|
|
NS_LOG_ADDREF(this, agg->mRefCnt, #_class, sizeof(*this)); \
|
|
return agg->mRefCnt; \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Internal::Release(void) \
|
|
{ \
|
|
_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
|
|
NS_PRECONDITION(0 != agg->mRefCnt, "dup release"); \
|
|
NS_ASSERT_OWNINGTHREAD(_class); \
|
|
--agg->mRefCnt; \
|
|
NS_LOG_RELEASE(this, agg->mRefCnt, #_class); \
|
|
if (agg->mRefCnt == 0) { \
|
|
agg->mRefCnt = 1; /* stabilize */ \
|
|
delete agg; \
|
|
return 0; \
|
|
} \
|
|
return agg->mRefCnt; \
|
|
} \
|
|
|
|
#define NS_IMPL_CYCLE_COLLECTING_AGGREGATED(_class) \
|
|
\
|
|
NS_IMPL_AGGREGATED_HELPER(_class) \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Internal::AddRef(void) \
|
|
{ \
|
|
_class* agg = NS_CYCLE_COLLECTION_CLASSNAME(_class)::Downcast(this); \
|
|
NS_PRECONDITION(PRInt32(agg->mRefCnt) >= 0, "illegal refcnt"); \
|
|
NS_CheckThreadSafe(agg->_mOwningThread.GetThread(), \
|
|
#_class " not thread-safe"); \
|
|
nsrefcnt count = agg->mRefCnt.incr(this); \
|
|
NS_LOG_ADDREF(this, count, #_class, sizeof(*agg)); \
|
|
return count; \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Internal::Release(void) \
|
|
{ \
|
|
_class* agg = NS_CYCLE_COLLECTION_CLASSNAME(_class)::Downcast(this); \
|
|
NS_PRECONDITION(0 != agg->mRefCnt, "dup release"); \
|
|
NS_CheckThreadSafe(agg->_mOwningThread.GetThread(), \
|
|
#_class " not thread-safe"); \
|
|
nsrefcnt count = agg->mRefCnt.decr(this); \
|
|
NS_LOG_RELEASE(this, count, #_class); \
|
|
if (count == 0) { \
|
|
agg->mRefCnt.stabilizeForDeletion(this); \
|
|
delete agg; \
|
|
return 0; \
|
|
} \
|
|
return count; \
|
|
}
|
|
|
|
#define NS_IMPL_AGGREGATED_HELPER(_class) \
|
|
NS_IMETHODIMP \
|
|
_class::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
|
|
{ \
|
|
return fOuter->QueryInterface(aIID, aInstancePtr); \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::AddRef(void) \
|
|
{ \
|
|
return fOuter->AddRef(); \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP_(nsrefcnt) \
|
|
_class::Release(void) \
|
|
{ \
|
|
return fOuter->Release(); \
|
|
} \
|
|
\
|
|
NS_IMETHODIMP \
|
|
_class::Internal::QueryInterface(const nsIID& aIID, void** aInstancePtr) \
|
|
{ \
|
|
_class* agg = (_class*)((char*)(this) - offsetof(_class, fAggregated)); \
|
|
return agg->AggregatedQueryInterface(aIID, aInstancePtr); \
|
|
} \
|
|
|
|
/**
|
|
* To make aggregated objects participate in cycle collection we need to enable
|
|
* the outer object (aggregator) to traverse/unlink the objects held by the
|
|
* inner object (the aggregatee). We can't just make the inner object QI'able to
|
|
* NS_CYCLECOLLECTIONPARTICIPANT_IID, we don't want to return the inner object's
|
|
* nsCycleCollectionParticipant for the outer object (which will happen if the
|
|
* outer object doesn't participate in cycle collection itself).
|
|
* NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID enables the outer object to get
|
|
* the inner objects nsCycleCollectionParticipant.
|
|
*
|
|
* There are three cases:
|
|
* - No aggregation
|
|
* QI'ing to NS_CYCLECOLLECTIONPARTICIPANT_IID will return the inner
|
|
* object's nsCycleCollectionParticipant.
|
|
*
|
|
* - Aggregation and outer object does not participate in cycle collection
|
|
* QI'ing to NS_CYCLECOLLECTIONPARTICIPANT_IID will not return anything.
|
|
*
|
|
* - Aggregation and outer object does participate in cycle collection
|
|
* QI'ing to NS_CYCLECOLLECTIONPARTICIPANT_IID will return the outer
|
|
* object's nsCycleCollectionParticipant. The outer object's
|
|
* nsCycleCollectionParticipant can then QI the inner object to
|
|
* NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID to get the inner object's
|
|
* nsCycleCollectionParticipant, which it can use to traverse/unlink the
|
|
* objects reachable from the inner object.
|
|
*/
|
|
#define NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID \
|
|
{ \
|
|
0x32889b7e, \
|
|
0xe4fe, \
|
|
0x43f4, \
|
|
{ 0x85, 0x31, 0xb5, 0x28, 0x23, 0xa2, 0xe9, 0xfc } \
|
|
}
|
|
|
|
/**
|
|
* Just holds the IID so NS_GET_IID works.
|
|
*/
|
|
class nsAggregatedCycleCollectionParticipant
|
|
{
|
|
public:
|
|
NS_DECLARE_STATIC_IID_ACCESSOR(NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID)
|
|
};
|
|
|
|
NS_DEFINE_STATIC_IID_ACCESSOR(nsAggregatedCycleCollectionParticipant,
|
|
NS_AGGREGATED_CYCLECOLLECTIONPARTICIPANT_IID)
|
|
|
|
// for use with QI macros in nsISupportsUtils.h:
|
|
|
|
#define NS_INTERFACE_MAP_BEGIN_AGGREGATED(_class) \
|
|
NS_IMPL_AGGREGATED_QUERY_HEAD(_class)
|
|
|
|
#define NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_AGGREGATED(_class) \
|
|
NS_IMPL_QUERY_CYCLE_COLLECTION(_class)
|
|
|
|
#define NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION_AGGREGATED(_class) \
|
|
NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_AGGREGATED(_class) \
|
|
NS_INTERFACE_MAP_ENTRY_CYCLE_COLLECTION_ISUPPORTS(_class)
|
|
|
|
#define NS_IMPL_AGGREGATED_QUERY_HEAD(_class) \
|
|
nsresult \
|
|
_class::AggregatedQueryInterface(REFNSIID aIID, void** aInstancePtr) \
|
|
{ \
|
|
NS_ASSERTION(aInstancePtr, \
|
|
"AggregatedQueryInterface requires a non-NULL result ptr!"); \
|
|
if ( !aInstancePtr ) \
|
|
return NS_ERROR_NULL_POINTER; \
|
|
nsISupports* foundInterface; \
|
|
if ( aIID.Equals(NS_GET_IID(nsISupports)) ) \
|
|
foundInterface = InnerObject(); \
|
|
else
|
|
|
|
#define NS_IMPL_AGGREGATED_QUERY_CYCLE_COLLECTION(_class) \
|
|
if (aIID.Equals(IsPartOfAggregated() ? \
|
|
NS_GET_IID(nsCycleCollectionParticipant) : \
|
|
NS_GET_IID(nsAggregatedCycleCollectionParticipant))) \
|
|
foundInterface = & NS_CYCLE_COLLECTION_NAME(_class); \
|
|
else
|
|
|
|
#define NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_AGGREGATED(_class) \
|
|
NS_IMETHODIMP \
|
|
NS_CYCLE_COLLECTION_CLASSNAME(_class)::Traverse \
|
|
(void *p, \
|
|
nsCycleCollectionTraversalCallback &cb) \
|
|
{ \
|
|
nsISupports *s = static_cast<nsISupports*>(p); \
|
|
NS_ASSERTION(CheckForRightISupports(s), \
|
|
"not the nsISupports pointer we expect"); \
|
|
_class *tmp = static_cast<_class*>(Downcast(s)); \
|
|
if (!tmp->IsPartOfAggregated()) \
|
|
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(_class, tmp->mRefCnt.get())
|
|
|
|
#define NS_GENERIC_AGGREGATED_CONSTRUCTOR(_InstanceClass) \
|
|
static nsresult \
|
|
_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \
|
|
void **aResult) \
|
|
{ \
|
|
*aResult = nsnull; \
|
|
\
|
|
NS_ENSURE_PROPER_AGGREGATION(aOuter, aIID); \
|
|
\
|
|
_InstanceClass* inst = new _InstanceClass(aOuter); \
|
|
if (!inst) { \
|
|
return NS_ERROR_OUT_OF_MEMORY; \
|
|
} \
|
|
\
|
|
nsISupports* inner = inst->InnerObject(); \
|
|
nsresult rv = inner->QueryInterface(aIID, aResult); \
|
|
if (NS_FAILED(rv)) { \
|
|
delete inst; \
|
|
} \
|
|
\
|
|
return rv; \
|
|
} \
|
|
|
|
#define NS_GENERIC_AGGREGATED_CONSTRUCTOR_INIT(_InstanceClass, _InitMethod) \
|
|
static nsresult \
|
|
_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID, \
|
|
void **aResult) \
|
|
{ \
|
|
*aResult = nsnull; \
|
|
\
|
|
NS_ENSURE_PROPER_AGGREGATION(aOuter, aIID); \
|
|
\
|
|
_InstanceClass* inst = new _InstanceClass(aOuter); \
|
|
if (!inst) { \
|
|
return NS_ERROR_OUT_OF_MEMORY; \
|
|
} \
|
|
\
|
|
nsISupports* inner = inst->InnerObject(); \
|
|
NS_ADDREF(inner); \
|
|
nsresult rv = inst->_InitMethod(); \
|
|
if (NS_SUCCEEDED(rv)) { \
|
|
rv = inner->QueryInterface(aIID, aResult); \
|
|
} \
|
|
NS_RELEASE(inner); \
|
|
\
|
|
return rv; \
|
|
} \
|
|
|
|
#endif /* nsAgg_h___ */
|