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gecko-dev/xpcom/base/nsISupportsUtils.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
* Scott Collins <scc@ScottCollins.net>
*/
#ifndef __nsISupportsUtils_h
#define __nsISupportsUtils_h
/***************************************************************************/
/* this section copied from the hand written nsISupports.h */
#include "nscore.h"
// for |NS_SPECIALIZE_TEMPLATE|, and the casts, et al
#include "nsDebug.h"
#include "nsID.h"
#include "nsIID.h"
#include "nsError.h"
#include "pratom.h" /* needed for PR_AtomicIncrement and PR_AtomicDecrement */
#if defined(NS_MT_SUPPORTED)
#include "prcmon.h"
#endif /* NS_MT_SUPPORTED */
/*@{*/
///////////////////////////////////////////////////////////////////////////////
/**
* IID for the nsISupports interface
* {00000000-0000-0000-c000-000000000046}
*
* To maintain binary compatibility with COM's nsIUnknown, we define the IID
* of nsISupports to be the same as that of COM's nsIUnknown.
*/
#define NS_ISUPPORTS_IID \
{ 0x00000000, 0x0000, 0x0000, \
{0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46} }
/**
* Reference count values
*
* This is type of return value from Addref() and Release() in nsISupports.
* nsIUnknown of COM returns a unsigned long from equivalent functions.
* To maintain binary compatibility of nsISupports with nsIUnknown, we are
* doing this ifdeffing.
*/
#if defined(XP_PC) && PR_BYTES_PER_LONG == 4
typedef unsigned long nsrefcnt;
#else
typedef PRUint32 nsrefcnt;
#endif
#include "nsTraceRefcnt.h"
/**
* Basic component object model interface. Objects which implement
* this interface support runtime interface discovery (QueryInterface)
* and a reference counted memory model (AddRef/Release). This is
* modelled after the win32 IUnknown API.
*/
class nsISupports {
public:
/**
* @name Methods
*/
//@{
/**
* A run time mechanism for interface discovery.
* @param aIID [in] A requested interface IID
* @param aInstancePtr [out] A pointer to an interface pointer to
* receive the result.
* @return <b>NS_OK</b> if the interface is supported by the associated
* instance, <b>NS_NOINTERFACE</b> if it is not.
* <b>NS_ERROR_INVALID_POINTER</b> if <i>aInstancePtr</i> is <b>NULL</b>.
*/
NS_IMETHOD QueryInterface(REFNSIID aIID,
void** aInstancePtr) = 0;
/**
* Increases the reference count for this interface.
* The associated instance will not be deleted unless
* the reference count is returned to zero.
*
* @return The resulting reference count.
*/
NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
/**
* Decreases the reference count for this interface.
* Generally, if the reference count returns to zero,
* the associated instance is deleted.
*
* @return The resulting reference count.
*/
NS_IMETHOD_(nsrefcnt) Release(void) = 0;
//@}
};
/*@}*/
/***************************************************************************/
/**
* A macro to build the static const IID accessor method
*/
#define NS_DEFINE_STATIC_IID_ACCESSOR(the_iid) \
static const nsIID& GetIID() {static nsIID iid = the_iid; return iid;}
/**
* A macro to build the static const CID accessor method
*/
#define NS_DEFINE_STATIC_CID_ACCESSOR(the_cid) \
static const nsID& GetCID() {static nsID cid = the_cid; return cid;}
/**
* Some convenience macros for implementing AddRef and Release
*/
/**
* Declare the reference count variable and the implementations of the
* AddRef and QueryInterface methods.
*/
#define NS_DECL_ISUPPORTS \
public: \
NS_IMETHOD QueryInterface(REFNSIID aIID, \
void** aInstancePtr); \
NS_IMETHOD_(nsrefcnt) AddRef(void); \
NS_IMETHOD_(nsrefcnt) Release(void); \
protected: \
nsrefcnt mRefCnt; \
public:
#define NS_DECL_ISUPPORTS_EXPORTED \
public: \
NS_EXPORT NS_IMETHOD QueryInterface(REFNSIID aIID, \
void** aInstancePtr); \
NS_EXPORT NS_IMETHOD_(nsrefcnt) AddRef(void); \
NS_EXPORT NS_IMETHOD_(nsrefcnt) Release(void); \
protected: \
nsrefcnt mRefCnt; \
public:
///////////////////////////////////////////////////////////////////////////////
/**
* Initialize the reference count variable. Add this to each and every
* constructor you implement.
*/
#define NS_INIT_REFCNT() mRefCnt = 0
#define NS_INIT_ISUPPORTS() NS_INIT_REFCNT() // what it should have been called in the first place
/**
* Use this macro to implement the AddRef method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*/
#define NS_IMPL_ADDREF(_class) \
NS_IMETHODIMP_(nsrefcnt) _class::AddRef(void) \
{ \
NS_PRECONDITION(PRInt32(mRefCnt) >= 0, "illegal refcnt"); \
++mRefCnt; \
NS_LOG_ADDREF(this, mRefCnt, #_class, sizeof(*this)); \
return mRefCnt; \
}
/**
* Use this macro to implement the Release method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*
* A note on the 'stabilization' of the refcnt to one. At that point,
* the object's refcount will have gone to zero. The object's
* destructor may trigger code that attempts to QueryInterface() and
* Release() 'this' again. Doing so will temporarily increment and
* decrement the refcount. (Only a logic error would make one try to
* keep a permanent hold on 'this'.) To prevent re-entering the
* destructor, we make sure that no balanced refcounting can return
* the refcount to |0|.
*/
#define NS_IMPL_RELEASE(_class) \
NS_IMETHODIMP_(nsrefcnt) _class::Release(void) \
{ \
NS_PRECONDITION(0 != mRefCnt, "dup release"); \
--mRefCnt; \
NS_LOG_RELEASE(this, mRefCnt, #_class); \
if (mRefCnt == 0) { \
mRefCnt = 1; /* stabilize */ \
NS_DELETEXPCOM(this); \
return 0; \
} \
return mRefCnt; \
}
///////////////////////////////////////////////////////////////////////////////
/*
* Often you have to cast an implementation pointer, e.g., |this|, to an |nsISupports*|,
* but because you have multiple inheritance, a simple cast is ambiguous. One could
* simply say, e.g., (given a base |nsIBase|), |NS_STATIC_CAST(nsIBase*, this)|; but that
* disguises the fact that what you are really doing is disambiguating the |nsISupports|.
* You could make that more obvious with a double cast, e.g.,
* |NS_STATIC_CAST(nsISupports*, NS_STATIC_CAST(nsIBase*, this))|, but that is bulky and
* harder to read...
*
* The following macro is clean, short, and obvious. In the example above, you would use it
* like this: |NS_ISUPPORTS_CAST(nsIBase*, this)|.
*/
#define NS_ISUPPORTS_CAST(__unambiguousBase, __expr) NS_STATIC_CAST(nsISupports*, NS_STATIC_CAST(__unambiguousBase, __expr))
///////////////////////////////////////////////////////////////////////////////
#ifdef NS_DEBUG
/*
* Adding this debug-only function as per bug #26803. If you are debugging and
* this function returns wrong refcounts, fix the objects |AddRef()| and |Release()|
* to do the right thing.
*
* Of course, this function is only available for debug builds.
*/
inline
nsrefcnt
NS_DebugGetRefCount( nsISupports* obj )
// Warning: don't apply this to an object whose refcount is
// |0| or not yet initialized ... it may be destroyed.
{
nsrefcnt ref_count = 0;
if ( obj )
{
// |AddRef()| and |Release()| are supposed to return
// the new refcount of the object
obj->AddRef();
ref_count = obj->Release();
// Can't use |NS_[ADDREF|RELEASE]| since (a) they _don't_ return
// the refcount, and (b) we don't want to log these guaranteed
// balanced calls.
NS_ASSERTION(ref_count, "Oops! Calling |NS_DebugGetRefCount()| probably just destroyed this object.");
}
return ref_count;
}
#endif
///////////////////////////////////////////////////////////////////////////////
/*
* Some convenience macros for implementing QueryInterface
*/
/**
* This implements query interface with two assumptions: First, the
* class in question implements nsISupports and its own interface and
* nothing else. Second, the implementation of the class's primary
* inheritance chain leads to its own interface.
*
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#define NS_IMPL_QUERY_HEAD(_class) \
NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
{ \
NS_ASSERTION(aInstancePtr, "QueryInterface requires a non-NULL destination!"); \
if ( !aInstancePtr ) \
return NS_ERROR_NULL_POINTER; \
nsISupports* foundInterface;
#define NS_IMPL_QUERY_BODY(_interface) \
if ( aIID.Equals(NS_GET_IID(_interface)) ) \
foundInterface = NS_STATIC_CAST(_interface*, this); \
else
#define NS_IMPL_QUERY_BODY_AMBIGUOUS(_interface, _implClass) \
if ( aIID.Equals(NS_GET_IID(_interface)) ) \
foundInterface = NS_STATIC_CAST(_interface*, NS_STATIC_CAST(_implClass*, this)); \
else
#define NS_IMPL_QUERY_TAIL_GUTS \
foundInterface = 0; \
nsresult status; \
if ( !foundInterface ) \
status = NS_NOINTERFACE; \
else \
{ \
NS_ADDREF(foundInterface); \
status = NS_OK; \
} \
*aInstancePtr = foundInterface; \
return status; \
}
#define NS_IMPL_QUERY_TAIL_INHERITING(_baseclass) \
foundInterface = 0; \
nsresult status; \
if ( !foundInterface ) \
status = _baseclass::QueryInterface(aIID, (void**)&foundInterface); \
else \
{ \
NS_ADDREF(foundInterface); \
status = NS_OK; \
} \
*aInstancePtr = foundInterface; \
return status; \
}
#define NS_IMPL_QUERY_TAIL(_supports_interface) \
NS_IMPL_QUERY_BODY_AMBIGUOUS(nsISupports, _supports_interface) \
NS_IMPL_QUERY_TAIL_GUTS
/*
This is the new scheme. Using this notation now will allow us to switch to
a table driven mechanism when it's ready. Note the difference between this
and the (currently) underlying NS_IMPL_QUERY_INTERFACE mechanism. You must
explicitly mention |nsISupports| when using the interface maps.
*/
#define NS_INTERFACE_MAP_BEGIN(_implClass) NS_IMPL_QUERY_HEAD(_implClass)
#define NS_INTERFACE_MAP_ENTRY(_interface) NS_IMPL_QUERY_BODY(_interface)
#define NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(_interface, _implClass) NS_IMPL_QUERY_BODY_AMBIGUOUS(_interface, _implClass)
#define NS_INTERFACE_MAP_END NS_IMPL_QUERY_TAIL_GUTS
#define NS_INTERFACE_MAP_END_INHERITING(_baseClass) NS_IMPL_QUERY_TAIL_INHERITING(_baseClass)
#define NS_IMPL_QUERY_INTERFACE0(_class) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(nsISupports) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE1(_class, _i1) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE2(_class, _i1, _i2) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE3(_class, _i1, _i2, _i3) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE4(_class, _i1, _i2, _i3, _i4) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY(_i4) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE5(_class, _i1, _i2, _i3, _i4, _i5) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY(_i4) \
NS_INTERFACE_MAP_ENTRY(_i5) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE6(_class, _i1, _i2, _i3, _i4, _i5, _i6) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY(_i4) \
NS_INTERFACE_MAP_ENTRY(_i5) \
NS_INTERFACE_MAP_ENTRY(_i6) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE7(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY(_i4) \
NS_INTERFACE_MAP_ENTRY(_i5) \
NS_INTERFACE_MAP_ENTRY(_i6) \
NS_INTERFACE_MAP_ENTRY(_i7) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE8(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY(_i4) \
NS_INTERFACE_MAP_ENTRY(_i5) \
NS_INTERFACE_MAP_ENTRY(_i6) \
NS_INTERFACE_MAP_ENTRY(_i7) \
NS_INTERFACE_MAP_ENTRY(_i8) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE9(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8, _i9) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY(_i4) \
NS_INTERFACE_MAP_ENTRY(_i5) \
NS_INTERFACE_MAP_ENTRY(_i6) \
NS_INTERFACE_MAP_ENTRY(_i7) \
NS_INTERFACE_MAP_ENTRY(_i8) \
NS_INTERFACE_MAP_ENTRY(_i9) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
#define NS_IMPL_QUERY_INTERFACE10(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8, _i9, _i10) \
NS_INTERFACE_MAP_BEGIN(_class) \
NS_INTERFACE_MAP_ENTRY(_i1) \
NS_INTERFACE_MAP_ENTRY(_i2) \
NS_INTERFACE_MAP_ENTRY(_i3) \
NS_INTERFACE_MAP_ENTRY(_i4) \
NS_INTERFACE_MAP_ENTRY(_i5) \
NS_INTERFACE_MAP_ENTRY(_i6) \
NS_INTERFACE_MAP_ENTRY(_i7) \
NS_INTERFACE_MAP_ENTRY(_i8) \
NS_INTERFACE_MAP_ENTRY(_i9) \
NS_INTERFACE_MAP_ENTRY(_i10) \
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, _i1) \
NS_INTERFACE_MAP_END
/*
The following macro is deprecated. We need to switch all instances
to |NS_IMPL_QUERY_INTERFACE1|, or |NS_IMPL_QUERY_INTERFACE0| depending
on how they were using it.
*/
#define NS_IMPL_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
{ \
if (NULL == aInstancePtr) { \
return NS_ERROR_NULL_POINTER; \
} \
\
*aInstancePtr = NULL; \
\
static NS_DEFINE_IID(kClassIID, _classiiddef); \
if (aIID.Equals(kClassIID)) { \
*aInstancePtr = (void*) this; \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
if (aIID.Equals(NS_GET_IID(nsISupports))) { \
*aInstancePtr = (void*) ((nsISupports*)this); \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
return NS_NOINTERFACE; \
}
/**
* Convenience macro for implementing all nsISupports methods for
* a simple class.
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#define NS_IMPL_ISUPPORTS(_class,_classiiddef) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE(_class,_classiiddef)
#define NS_IMPL_ISUPPORTS0(_class) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE0(_class)
#define NS_IMPL_ISUPPORTS1(_class, _interface) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE1(_class, _interface)
#define NS_IMPL_ISUPPORTS2(_class, _i1, _i2) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE2(_class, _i1, _i2)
#define NS_IMPL_ISUPPORTS3(_class, _i1, _i2, _i3) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE3(_class, _i1, _i2, _i3)
#define NS_IMPL_ISUPPORTS4(_class, _i1, _i2, _i3, _i4) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE4(_class, _i1, _i2, _i3, _i4)
#define NS_IMPL_ISUPPORTS5(_class, _i1, _i2, _i3, _i4, _i5) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE5(_class, _i1, _i2, _i3, _i4, _i5)
#define NS_IMPL_ISUPPORTS6(_class, _i1, _i2, _i3, _i4, _i5, _i6) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE6(_class, _i1, _i2, _i3, _i4, _i5, _i6)
#define NS_IMPL_ISUPPORTS7(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE7(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7)
#define NS_IMPL_ISUPPORTS8(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE8(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8)
#define NS_IMPL_ISUPPORTS9(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8, \
_i9) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE9(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8, _i9)
#define NS_IMPL_ISUPPORTS10(_class, _i1, _i2, _i3, _i4, _i5, _i6, \
_i7, _i8, _i9, _i10) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE10(_class, _i1, _i2, _i3, _i4, _i5, _i6, _i7, _i8, \
_i9, _i10)
////////////////////////////////////////////////////////////////////////////////
/**
* Declare that you're going to inherit from something that already
* implements nsISupports, but also implements an additional interface, thus
* causing an ambiguity. In this case you don't need another mRefCnt, you
* just need to forward the definitions to the appropriate superclass. E.g.
*
* class Bar : public Foo, public nsIBar { // both provide nsISupports
* public:
* NS_DECL_ISUPPORTS_INHERITED
* ...other nsIBar and Bar methods...
* };
*/
#define NS_DECL_ISUPPORTS_INHERITED \
public: \
NS_IMETHOD QueryInterface(REFNSIID aIID, \
void** aInstancePtr); \
NS_IMETHOD_(nsrefcnt) AddRef(void); \
NS_IMETHOD_(nsrefcnt) Release(void); \
/**
* These macros can be used in conjunction with NS_DECL_ISUPPORTS_INHERITED
* to implement the nsISupports methods, forwarding the invocations to a
* superclass that already implements nsISupports.
*
* Note that I didn't make these inlined because they're virtual methods.
*/
#define NS_IMPL_ADDREF_INHERITED(Class, Super) \
NS_IMETHODIMP_(nsrefcnt) Class::AddRef(void) \
{ \
return Super::AddRef(); \
} \
#define NS_IMPL_RELEASE_INHERITED(Class, Super) \
NS_IMETHODIMP_(nsrefcnt) Class::Release(void) \
{ \
return Super::Release(); \
} \
#define NS_IMPL_QUERY_INTERFACE_INHERITED(Class, Super, i1) \
NS_IMPL_QUERY_INTERFACE_INHERITED1(Class, Super, i1) \
#define NS_IMPL_QUERY_INTERFACE_INHERITED0(Class, Super) \
NS_IMPL_QUERY_HEAD(Class) \
NS_IMPL_QUERY_TAIL_INHERITING(Super) \
#define NS_IMPL_QUERY_INTERFACE_INHERITED1(Class, Super, i1) \
NS_IMPL_QUERY_HEAD(Class) \
NS_IMPL_QUERY_BODY(i1) \
NS_IMPL_QUERY_TAIL_INHERITING(Super) \
#define NS_IMPL_QUERY_INTERFACE_INHERITED2(Class, Super, i1, i2) \
NS_IMPL_QUERY_HEAD(Class) \
NS_IMPL_QUERY_BODY(i1) \
NS_IMPL_QUERY_BODY(i2) \
NS_IMPL_QUERY_TAIL_INHERITING(Super) \
#define NS_IMPL_QUERY_INTERFACE_INHERITED3(Class, Super, i1, i2, i3) \
NS_IMPL_QUERY_INHERITED_HEAD(Class) \
NS_IMPL_QUERY_BODY(i1) \
NS_IMPL_QUERY_BODY(i2) \
NS_IMPL_QUERY_BODY(i3) \
NS_IMPL_QUERY_INHERITED_TAIL(Class, Super) \
#define NS_IMPL_ISUPPORTS_INHERITED(Class, Super, i1) \
NS_IMPL_ISUPPORTS_INHERITED1(Class, Super, i1) \
#define NS_IMPL_ISUPPORTS_INHERITED0(Class, Super) \
NS_IMPL_QUERY_INTERFACE_INHERITED0(Class, Super) \
NS_IMPL_ADDREF_INHERITED(Class, Super) \
NS_IMPL_RELEASE_INHERITED(Class, Super) \
#define NS_IMPL_ISUPPORTS_INHERITED1(Class, Super, i1) \
NS_IMPL_QUERY_INTERFACE_INHERITED1(Class, Super, i1) \
NS_IMPL_ADDREF_INHERITED(Class, Super) \
NS_IMPL_RELEASE_INHERITED(Class, Super) \
#define NS_IMPL_ISUPPORTS_INHERITED2(Class, Super, i1, i2) \
NS_IMPL_QUERY_INTERFACE_INHERITED2(Class, Super, i1, i2) \
NS_IMPL_ADDREF_INHERITED(Class, Super) \
NS_IMPL_RELEASE_INHERITED(Class, Super) \
#define NS_IMPL_ISUPPORTS_INHERITED3(Class, Super, i1, i2, i3) \
NS_IMPL_QUERY_INTERFACE_INHERITED3(Class, Super, i1, i2, i3) \
NS_IMPL_ADDREF_INHERITED(Class, Super) \
NS_IMPL_RELEASE_INHERITED(Class, Super) \
///////////////////////////////////////////////////////////////////////////////
/**
*
* Threadsafe implementations of the ISupports convenience macros
*
*/
/**
* IID for the nsIsThreadsafe interface
* {88210890-47a6-11d2-bec3-00805f8a66dc}
*
* This interface is *only* used for debugging purposes to determine if
* a given component is threadsafe.
*/
#define NS_ISTHREADSAFE_IID \
{ 0x88210890, 0x47a6, 0x11d2, \
{0xbe, 0xc3, 0x00, 0x80, 0x5f, 0x8a, 0x66, 0xdc} }
#if defined(NS_MT_SUPPORTED)
#define NS_LOCK_INSTANCE() \
PR_CEnterMonitor((void*)this)
#define NS_UNLOCK_INSTANCE() \
PR_CExitMonitor((void*)this)
/**
* Use this macro to implement the AddRef method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*/
#define NS_IMPL_THREADSAFE_ADDREF(_class) \
NS_IMETHODIMP_(nsrefcnt) _class::AddRef(void) \
{ \
NS_PRECONDITION(PRInt32(mRefCnt) >= 0, "illegal refcnt"); \
NS_LOG_ADDREF(this, mRefCnt+1, #_class, sizeof(*this)); \
return PR_AtomicIncrement((PRInt32*)&mRefCnt); \
}
/**
* Use this macro to implement the Release method for a given <i>_class</i>
* @param _class The name of the class implementing the method
*/
#define NS_IMPL_THREADSAFE_RELEASE(_class) \
nsrefcnt _class::Release(void) \
{ \
nsrefcnt count; \
NS_PRECONDITION(0 != mRefCnt, "dup release"); \
NS_LOG_RELEASE(this, mRefCnt-1, #_class); \
count = PR_AtomicDecrement((PRInt32 *)&mRefCnt); \
if (0 == count) { \
NS_DELETEXPCOM(this); \
return 0; \
} \
return count; \
}
///////////////////////////////////////////////////////////////////////////////
/*
* Some convenience macros for implementing QueryInterface
*/
/**
* This implements query interface with two assumptions: First, the
* class in question implements nsISupports and its own interface and
* nothing else. Second, the implementation of the class's primary
* inheritance chain leads to its own interface.
*
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#if defined(NS_DEBUG)
#define NS_VERIFY_THREADSAFE_INTERFACE(_iface) \
if (NULL != (_iface)) { \
nsISupports* tmp; \
static NS_DEFINE_IID(kIsThreadsafeIID, NS_ISTHREADSAFE_IID); \
NS_PRECONDITION((NS_OK == _iface->QueryInterface(kIsThreadsafeIID, \
(void**)&tmp)), \
"Interface is not threadsafe"); \
}
#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMETHODIMP _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
{ \
if (NULL == aInstancePtr) { \
return NS_ERROR_NULL_POINTER; \
} \
\
*aInstancePtr = NULL; \
\
static NS_DEFINE_IID(kIsThreadsafeIID, NS_ISTHREADSAFE_IID); \
static NS_DEFINE_IID(kClassIID, _classiiddef); \
if (aIID.Equals(kClassIID)) { \
*aInstancePtr = (void*) this; \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
if (aIID.Equals(NS_GET_IID(nsISupports))) { \
*aInstancePtr = (void*) ((nsISupports*)this); \
NS_ADDREF_THIS(); \
return NS_OK; \
} \
if (aIID.Equals(kIsThreadsafeIID)) { \
return NS_OK; \
} \
return NS_NOINTERFACE; \
}
#else /* !NS_DEBUG */
#define NS_VERIFY_THREADSAFE_INTERFACE(_iface)
#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMPL_QUERY_INTERFACE(_class, _classiiddef)
#endif /* !NS_DEBUG */
/**
* Convenience macro for implementing all nsISupports methods for
* a simple class.
* @param _class The name of the class implementing the method
* @param _classiiddef The name of the #define symbol that defines the IID
* for the class (e.g. NS_ISUPPORTS_IID)
*/
#define NS_IMPL_THREADSAFE_ISUPPORTS(_class,_classiiddef) \
NS_IMPL_THREADSAFE_ADDREF(_class) \
NS_IMPL_THREADSAFE_RELEASE(_class) \
NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef)
#else /* !NS_MT_SUPPORTED */
#define NS_LOCK_INSTANCE()
#define NS_UNLOCK_INSTANCE()
#define NS_IMPL_THREADSAFE_ADDREF(_class) NS_IMPL_ADDREF(_class)
#define NS_IMPL_THREADSAFE_RELEASE(_class) NS_IMPL_RELEASE(_class)
#define NS_VERIFY_THREADSAFE_INTERFACE(_iface)
#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
NS_IMPL_QUERY_INTERFACE(_class, _classiiddef)
#define NS_IMPL_THREADSAFE_ISUPPORTS(_class,_classiiddef) \
NS_IMPL_ADDREF(_class) \
NS_IMPL_RELEASE(_class) \
NS_IMPL_QUERY_INTERFACE(_class,_classiiddef)
#endif /* !NS_MT_SUPPORTED */
///////////////////////////////////////////////////////////////////////////////
// Debugging Macros
///////////////////////////////////////////////////////////////////////////////
/**
* Macro for instantiating a new object that implements nsISupports.
* Use this in your factory methods to allow for refcnt tracing.
* Note that you can only use this if you adhere to the no arguments
* constructor com policy (which you really should!).
* @param _result Where the new instance pointer is stored
* @param _type The type of object to call "new" with.
*/
#define NS_NEWXPCOM(_result,_type) \
PR_BEGIN_MACRO \
_result = new _type(); \
NS_LOG_NEW_XPCOM(_result, #_type, sizeof(_type), __FILE__, __LINE__); \
PR_END_MACRO
/**
* Macro for deleting an object that implements nsISupports.
* Use this in your Release methods to allow for refcnt tracing.
* @param _ptr The object to delete.
*/
#define NS_DELETEXPCOM(_ptr) \
PR_BEGIN_MACRO \
NS_LOG_DELETE_XPCOM((_ptr), __FILE__, __LINE__); \
delete (_ptr); \
PR_END_MACRO
/**
* Macro for adding a reference to an interface.
* @param _ptr The interface pointer.
*/
#define NS_ADDREF(_ptr) \
NS_LOG_ADDREF_CALL((_ptr), (_ptr)->AddRef(), __FILE__, __LINE__)
/**
* Macro for adding a reference to this. This macro should be used
* because NS_ADDREF (when tracing) may require an ambiguous cast
* from the pointers primary type to nsISupports. This macro sidesteps
* that entire problem.
*/
#define NS_ADDREF_THIS() \
NS_LOG_ADDREF_CALL(this, AddRef(), __FILE__, __LINE__)
extern "C++" {
// ...because some one is accidentally including this file inside
// an |extern "C"|
template <class T>
inline
nsrefcnt
ns_if_addref( T expr )
// Making this a |inline| |template| allows |expr| to be evaluated only once,
// yet still denies you the ability to |AddRef()| an |nsCOMPtr|.
// Note that |NS_ADDREF()| already has this property in the non-logging case.
{
return expr ? expr->AddRef() : 0;
}
} /* extern "C++" */
#ifdef NS_BUILD_REFCNT_LOGGING
/**
* Macro for adding a reference to an interface that checks for NULL.
* @param _expr The interface pointer.
*/
#define NS_IF_ADDREF(_expr) \
((0 != (_expr)) \
? NS_LOG_ADDREF_CALL((_expr), ns_if_addref(_expr), __FILE__, __LINE__) \
: 0)
#else
#define NS_IF_ADDREF(_expr) ns_if_addref(_expr)
#endif
/*
* Given these declarations, it explicitly OK and (in the non-logging build) efficient
* to end a `getter' with:
*
* NS_IF_ADDREF(*result = mThing);
*
* even if |mThing| is an |nsCOMPtr|. If |mThing| is an |nsCOMPtr|, however, it is still
* _illegal_ to say |NS_IF_ADDREF(mThing)|.
*/
/**
* Macro for releasing a reference to an interface.
*
* Note that when NS_LOSING_ARCHITECTURE is defined that the release will
* be done before the trace message is logged. If the reference count
* goes to zero and implementation of Release logs a message, the two
* messages will be logged out of order.
*
* @param _ptr The interface pointer.
*/
#define NS_RELEASE(_ptr) \
PR_BEGIN_MACRO \
NS_LOG_RELEASE_CALL((_ptr), (_ptr)->Release(), __FILE__, __LINE__); \
(_ptr) = 0; \
PR_END_MACRO
/**
* Macro for releasing a reference to an interface.
*
* Note that when NS_LOSING_ARCHITECTURE is defined that the release will
* be done before the trace message is logged. If the reference count
* goes to zero and implementation of Release logs a message, the two
* messages will be logged out of order.
*
* @param _ptr The interface pointer.
*/
#define NS_RELEASE_THIS() \
NS_LOG_RELEASE_CALL(this, Release(), __FILE__, __LINE__)
/**
* Macro for releasing a reference to an interface, except that this
* macro preserves the return value from the underlying Release call.
* The interface pointer argument will only be NULLed if the reference count
* goes to zero.
*
* Note that when NS_LOSING_ARCHITECTURE is defined that the release will
* be done before the trace message is logged. If the reference count
* goes to zero and implementation of Release logs a message, the two
* messages will be logged out of order.
*
* @param _ptr The interface pointer.
*/
#define NS_RELEASE2(_ptr,_rv) \
PR_BEGIN_MACRO \
_rv = NS_LOG_RELEASE_CALL((_ptr), (_ptr)->Release(),__FILE__,__LINE__); \
if (0 == (_rv)) (_ptr) = 0; \
PR_END_MACRO
/**
* Macro for releasing a reference to an interface that checks for NULL;
*
* Note that when NS_LOSING_ARCHITECTURE is defined that the release will
* be done before the trace message is logged. If the reference count
* goes to zero and implementation of Release logs a message, the two
* messages will be logged out of order.
*
* @param _ptr The interface pointer.
*/
#define NS_IF_RELEASE(_ptr) \
PR_BEGIN_MACRO \
if (_ptr) { \
NS_LOG_RELEASE_CALL((_ptr), (_ptr)->Release(), __FILE__, __LINE__); \
(_ptr) = 0; \
} \
PR_END_MACRO
///////////////////////////////////////////////////////////////////////////////
extern "C++" {
// ...because some one is accidentally including this file inside
// an |extern "C"|
class nsISupports;
template <class T>
struct nsCOMTypeInfo
{
static const nsIID& GetIID() { return T::GetIID(); }
};
NS_SPECIALIZE_TEMPLATE
struct nsCOMTypeInfo<nsISupports>
{
static const nsIID& GetIID() {
static nsIID iid = NS_ISUPPORTS_IID; return iid;
}
};
#define NS_GET_IID(T) nsCOMTypeInfo<T>::GetIID()
// a type-safe shortcut for calling the |QueryInterface()| member function
template <class DestinationType>
inline
nsresult
CallQueryInterface( nsISupports* aSource, DestinationType** aDestination )
{
NS_PRECONDITION(aSource, "null parameter");
NS_PRECONDITION(aDestination, "null parameter");
return aSource->QueryInterface(NS_GET_IID(DestinationType), (void**)aDestination);
}
} // extern "C++"
///////////////////////////////////////////////////////////////////////////////
// Macros for checking the trueness of an expression passed in within an
// interface implementation.
///////////////////////////////////////////////////////////////////////////////
#define NS_ENSURE_TRUE(x, ret) \
PR_BEGIN_MACRO \
if(NS_WARN_IF_FALSE(x, "NS_ENSURE_TRUE(" #x ") failed")) \
return ret; \
PR_END_MACRO
#define NS_ENSURE_FALSE(x, ret) \
NS_ENSURE_TRUE(!(x), ret)
///////////////////////////////////////////////////////////////////////////////
// Macros for checking results
///////////////////////////////////////////////////////////////////////////////
#define NS_ENSURE_SUCCESS(res, ret) \
NS_ENSURE_TRUE(NS_SUCCEEDED(res), ret)
///////////////////////////////////////////////////////////////////////////////
// Macros for checking state and arguments upon entering interface boundaries
///////////////////////////////////////////////////////////////////////////////
#define NS_ENSURE_ARG(arg) \
NS_ENSURE_TRUE(arg, NS_ERROR_INVALID_ARG)
#define NS_ENSURE_ARG_POINTER(arg) \
NS_ENSURE_TRUE(arg, NS_ERROR_INVALID_POINTER)
#define NS_ENSURE_ARG_MIN(arg, min) \
NS_ENSURE_TRUE((arg) >= min, NS_ERROR_INVALID_ARG)
#define NS_ENSURE_ARG_MAX(arg, max) \
NS_ENSURE_TRUE((arg) <= min, NS_ERROR_INVALID_ARG)
#define NS_ENSURE_ARG_RANGE(arg, min, max) \
NS_ENSURE_TRUE(((arg) >= min) && ((arg) <= max), NS_ERROR_INVALID_ARG)
#define NS_ENSURE_STATE(state) \
NS_ENSURE_TRUE(state, NS_ERROR_UNEXPECTED)
#define NS_ENSURE_NO_AGGREGATION(outer) \
NS_ENSURE_FALSE(outer, NS_ERROR_NO_AGGREGATION)
#define NS_ENSURE_PROPER_AGGREGATION(outer, iid) \
NS_ENSURE_FALSE(outer && !iid.Equals(NS_GET_IID(nsISupports)), NS_ERROR_INVALID_ARG)
///////////////////////////////////////////////////////////////////////////////
#endif /* __nsISupportsUtils_h */
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