mirror of
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543 lines
20 KiB
C++
543 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsISupports_h___
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#define nsISupports_h___
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#include "nsDebug.h"
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#include "nsTraceRefcnt.h"
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#include "nsID.h"
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#include "nsError.h"
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#if defined(NS_MT_SUPPORTED)
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#include "prcmon.h"
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#endif /* NS_MT_SUPPORTED */
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/*@{*/
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/**
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* An "interface id" which can be used to uniquely identify a given
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* interface.
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*/
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typedef nsID nsIID;
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/**
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* A macro shorthand for <tt>const nsIID&<tt>
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*/
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#define REFNSIID const nsIID&
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/**
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* Define an IID (obsolete)
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*/
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#define NS_DEFINE_IID(_name, _iidspec) \
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const nsIID _name = _iidspec
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//----------------------------------------------------------------------
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/**
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* IID for the nsISupports interface
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* {00000000-0000-0000-c000-000000000046}
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*
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* NOTE: NEVER EVER EVER EVER EVER change this IID. Never. Not once.
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* No. Don't do it. Stop!
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*/
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#define NS_ISUPPORTS_IID \
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{ 0x00000000, 0x0000, 0x0000, \
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{0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46} }
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/**
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* Reference count values
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*/
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typedef PRUint32 nsrefcnt;
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/**
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* Basic component object model interface. Objects which implement
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* this interface support runtime interface discovery (QueryInterface)
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* and a reference counted memory model (AddRef/Release). This is
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* modelled after the win32 IUnknown API.
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*/
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class nsISupports {
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public:
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/**
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* @name Methods
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*/
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//@{
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/**
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* A run time mechanism for interface discovery.
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* @param aIID [in] A requested interface IID
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* @param aInstancePtr [out] A pointer to an interface pointer to
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* receive the result.
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* @return <b>NS_OK</b> if the interface is supported by the associated
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* instance, <b>NS_NOINTERFACE</b> if it is not.
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* <b>NS_ERROR_INVALID_POINTER</b> if <i>aInstancePtr</i> is <b>NULL</b>.
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*/
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NS_IMETHOD QueryInterface(REFNSIID aIID,
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void** aInstancePtr) = 0;
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/**
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* Increases the reference count for this interface.
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* The associated instance will not be deleted unless
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* the reference count is returned to zero.
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*
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* @return The resulting reference count.
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*/
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NS_IMETHOD_(nsrefcnt) AddRef(void) = 0;
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/**
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* Decreases the reference count for this interface.
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* Generally, if the reference count returns to zero,
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* the associated instance is deleted.
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*
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* @return The resulting reference count.
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*/
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NS_IMETHOD_(nsrefcnt) Release(void) = 0;
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//@}
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};
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//----------------------------------------------------------------------
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/**
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* Some convenience macros for implementing AddRef and Release
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*/
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/**
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* Declare the reference count variable and the implementations of the
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* AddRef and QueryInterface methods.
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*/
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#define NS_DECL_ISUPPORTS \
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public: \
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NS_IMETHOD QueryInterface(REFNSIID aIID, \
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void** aInstancePtr); \
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NS_IMETHOD_(nsrefcnt) AddRef(void); \
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NS_IMETHOD_(nsrefcnt) Release(void); \
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protected: \
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nsrefcnt mRefCnt; \
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public:
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/**
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* Initialize the reference count variable. Add this to each and every
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* constructor you implement.
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*/
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#define NS_INIT_REFCNT() mRefCnt = 0
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/**
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* Use this macro to implement the AddRef method for a given <i>_class</i>
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* @param _class The name of the class implementing the method
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*/
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#define NS_IMPL_ADDREF(_class) \
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nsrefcnt _class::AddRef(void) \
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{ \
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return ++mRefCnt; \
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}
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/**
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* Macro for instantiating a new object that implements nsISupports.
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* Use this in your factory methods to allow for refcnt tracing.
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* Note that you can only use this if you adhere to the no arguments
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* constructor com policy (which you really should!).
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* @param _result Where the new instance pointer is stored
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* @param _type The type of object to call "new" with.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_NEWXPCOM(_result,_type) \
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_result = new _type(); \
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nsTraceRefcnt::Create(_result, #_type, __FILE__, __LINE__)
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#else
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#define NS_NEWXPCOM(_result,_type) \
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_result = new _type()
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#endif
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/**
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* Macro for deleting an object that implements nsISupports.
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* Use this in your Release methods to allow for refcnt tracing.
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* @param _ptr The object to delete.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_DELETEXPCOM(_ptr) \
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nsTraceRefcnt::Destroy(_ptr, __FILE__, __LINE__); \
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delete _ptr
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#else
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#define NS_DELETEXPCOM(_ptr) \
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delete _ptr
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#endif
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/**
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* Macro for adding a reference to an interface.
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* @param _ptr The interface pointer.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_ADDREF(_ptr) \
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((nsrefcnt) nsTraceRefcnt::AddRef((_ptr), (_ptr)->AddRef(), \
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__FILE__, __LINE__))
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#else
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#define NS_ADDREF(_ptr) \
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(_ptr)->AddRef()
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#endif
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/**
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* Macro for adding a reference to this. This macro should be used
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* because NS_ADDREF (when tracing) may require an ambiguous cast
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* from the pointers primary type to nsISupports. This macro sidesteps
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* that entire problem.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_ADDREF_THIS() \
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((nsrefcnt) nsTraceRefcnt::AddRef(this, AddRef(), __FILE__, __LINE__))
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#else
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#define NS_ADDREF_THIS() \
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AddRef()
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#endif
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/**
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* Macro for adding a reference to an interface that checks for NULL.
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* @param _ptr The interface pointer.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_IF_ADDREF(_ptr) \
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((0 != (_ptr)) \
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? ((nsrefcnt) nsTraceRefcnt::AddRef((_ptr), (_ptr)->AddRef(), __FILE__, \
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__LINE__)) \
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: 0)
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#else
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#define NS_IF_ADDREF(_ptr) \
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((0 != (_ptr)) ? (_ptr)->AddRef() : 0)
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#endif
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/**
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* Macro for releasing a reference to an interface.
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*
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* Note that when MOZ_TRACE_XPCOM_REFCNT is defined that the release will
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* be done before the trace message is logged. If the reference count
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* goes to zero and implementation of Release logs a message, the two
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* messages will be logged out of order.
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*
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* @param _ptr The interface pointer.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_RELEASE(_ptr) \
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nsTraceRefcnt::Release((_ptr), (_ptr)->Release(), __FILE__, __LINE__); \
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(_ptr) = NULL
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#else
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#define NS_RELEASE(_ptr) \
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(_ptr)->Release(); \
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(_ptr) = NULL
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#endif
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/**
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* Macro for releasing a reference to an interface, except that this
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* macro preserves the return value from the underlying Release call.
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* The interface pointer argument will only be NULLed if the reference count
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* goes to zero.
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*
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* Note that when MOZ_TRACE_XPCOM_REFCNT is defined that the release will
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* be done before the trace message is logged. If the reference count
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* goes to zero and implementation of Release logs a message, the two
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* messages will be logged out of order.
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*
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* @param _ptr The interface pointer.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_RELEASE2(_ptr, _result) \
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_result = ((nsrefcnt) nsTraceRefcnt::Release((_ptr), (_ptr)->Release(), \
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__FILE__, __LINE__)); \
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if (0 == (_result)) (_ptr) = NULL
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#else
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#define NS_RELEASE2(_ptr, _result) \
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_result = (_ptr)->Release(); \
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if (0 == (_result)) (_ptr) = NULL
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#endif
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/**
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* Macro for releasing a reference to an interface that checks for NULL;
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*
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* Note that when MOZ_TRACE_XPCOM_REFCNT is defined that the release will
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* be done before the trace message is logged. If the reference count
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* goes to zero and implementation of Release logs a message, the two
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* messages will be logged out of order.
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*
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* @param _ptr The interface pointer.
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*/
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#ifdef MOZ_TRACE_XPCOM_REFCNT
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#define NS_IF_RELEASE(_ptr) \
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((0 != (_ptr)) \
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? ((nsrefcnt) nsTraceRefcnt::Release((_ptr), (_ptr)->Release(), \
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__FILE__, __LINE__)) \
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: 0); \
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(_ptr) = NULL
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#else
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#define NS_IF_RELEASE(_ptr) \
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((0 != (_ptr)) ? (_ptr)->Release() : 0); \
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(_ptr) = NULL
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#endif
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/**
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* Use this macro to implement the Release method for a given <i>_class</i>
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* @param _class The name of the class implementing the method
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*/
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#define NS_IMPL_RELEASE(_class) \
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nsrefcnt _class::Release(void) \
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{ \
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NS_PRECONDITION(0 != mRefCnt, "dup release"); \
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if (--mRefCnt == 0) { \
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NS_DELETEXPCOM(this); \
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return 0; \
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} \
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return mRefCnt; \
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}
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//----------------------------------------------------------------------
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/*
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* Some convenience macros for implementing QueryInterface
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*/
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/**
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* This implements query interface with two assumptions: First, the
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* class in question implements nsISupports and it's own interface and
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* nothing else. Second, the implementation of the class's primary
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* inheritance chain leads to it's own interface.
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*
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* @param _class The name of the class implementing the method
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* @param _classiiddef The name of the #define symbol that defines the IID
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* for the class (e.g. NS_ISUPPORTS_IID)
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*/
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#define NS_IMPL_QUERY_INTERFACE(_class,_classiiddef) \
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nsresult _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
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{ \
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if (NULL == aInstancePtr) { \
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return NS_ERROR_NULL_POINTER; \
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} \
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\
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*aInstancePtr = NULL; \
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\
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID); \
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static NS_DEFINE_IID(kClassIID, _classiiddef); \
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if (aIID.Equals(kClassIID)) { \
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*aInstancePtr = (void*) this; \
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NS_ADDREF_THIS(); \
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return NS_OK; \
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} \
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if (aIID.Equals(kISupportsIID)) { \
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*aInstancePtr = (void*) ((nsISupports*)this); \
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NS_ADDREF_THIS(); \
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return NS_OK; \
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} \
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return NS_NOINTERFACE; \
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}
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/**
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* Convenience macro for implementing all nsISupports methods for
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* a simple class.
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* @param _class The name of the class implementing the method
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* @param _classiiddef The name of the #define symbol that defines the IID
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* for the class (e.g. NS_ISUPPORTS_IID)
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*/
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#define NS_IMPL_ISUPPORTS(_class,_classiiddef) \
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NS_IMPL_ADDREF(_class) \
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NS_IMPL_RELEASE(_class) \
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NS_IMPL_QUERY_INTERFACE(_class,_classiiddef)
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/**
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*
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* Threadsafe implementations of the ISupports convenience macros
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*
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*/
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/**
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* IID for the nsIsThreadsafe interface
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* {88210890-47a6-11d2-bec3-00805f8a66dc}
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*
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* This interface is *only* used for debugging purposes to determine if
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* a given component is threadsafe.
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*/
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#define NS_ISTHREADSAFE_IID \
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{ 0x88210890, 0x47a6, 0x11d2, \
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{0xbe, 0xc3, 0x00, 0x80, 0x5f, 0x8a, 0x66, 0xdc} }
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#if defined(NS_MT_SUPPORTED)
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#define NS_LOCK_INSTANCE() \
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PR_CEnterMonitor((void*)this)
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#define NS_UNLOCK_INSTANCE() \
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PR_CExitMonitor((void*)this)
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/**
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* Use this macro to implement the AddRef method for a given <i>_class</i>
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* @param _class The name of the class implementing the method
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*/
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#if defined(XP_PC)
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#define NS_IMPL_THREADSAFE_ADDREF(_class) \
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nsrefcnt _class::AddRef(void) \
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{ \
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return InterlockedIncrement((LONG*)&mRefCnt); \
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}
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#else /* ! XP_PC */
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#define NS_IMPL_THREADSAFE_ADDREF(_class) \
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nsrefcnt _class::AddRef(void) \
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{ \
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nsrefcnt count; \
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NS_LOCK_INSTANCE(); \
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count = ++mRefCnt; \
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NS_UNLOCK_INSTANCE(); \
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return count; \
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}
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#endif /* ! XP_PC */
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/**
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* Use this macro to implement the Release method for a given <i>_class</i>
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* @param _class The name of the class implementing the method
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*/
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#if defined(XP_PC)
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#define NS_IMPL_THREADSAFE_RELEASE(_class) \
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nsrefcnt _class::Release(void) \
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{ \
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NS_PRECONDITION(0 != mRefCnt, "dup release"); \
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if (0 == InterlockedDecrement((LONG*)&mRefCnt)) { \
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NS_DELETEXPCOM(this); \
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return 0; \
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} \
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return mRefCnt; /* Not threadsafe but who cares. */ \
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}
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#else /* ! XP_PC */
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#define NS_IMPL_THREADSAFE_RELEASE(_class) \
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nsrefcnt _class::Release(void) \
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{ \
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nsrefcnt count; \
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NS_PRECONDITION(0 != mRefCnt, "dup release"); \
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NS_LOCK_INSTANCE(); \
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count = --mRefCnt; \
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NS_UNLOCK_INSTANCE(); \
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if (0 == count) { \
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NS_DELETEXPCOM(this); \
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return 0; \
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} \
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return count; \
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}
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#endif /* ! XP_PC */
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//----------------------------------------------------------------------
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/*
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* Some convenience macros for implementing QueryInterface
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*/
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/**
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* This implements query interface with two assumptions: First, the
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* class in question implements nsISupports and it's own interface and
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* nothing else. Second, the implementation of the class's primary
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* inheritance chain leads to it's own interface.
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|
*
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* @param _class The name of the class implementing the method
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* @param _classiiddef The name of the #define symbol that defines the IID
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* for the class (e.g. NS_ISUPPORTS_IID)
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*/
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#if defined(NS_DEBUG)
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#define NS_VERIFY_THREADSAFE_INTERFACE(_iface) \
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if (NULL != (_iface)) { \
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nsISupports* tmp; \
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static NS_DEFINE_IID(kIsThreadsafeIID, NS_ISTHREADSAFE_IID); \
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NS_PRECONDITION((NS_OK == _iface->QueryInterface(kIsThreadsafeIID, \
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(void**)&tmp)), \
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"Interface is not threadsafe"); \
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}
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#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
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nsresult _class::QueryInterface(REFNSIID aIID, void** aInstancePtr) \
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{ \
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if (NULL == aInstancePtr) { \
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return NS_ERROR_NULL_POINTER; \
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} \
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\
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*aInstancePtr = NULL; \
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\
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID); \
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static NS_DEFINE_IID(kIsThreadsafeIID, NS_ISTHREADSAFE_IID); \
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static NS_DEFINE_IID(kClassIID, _classiiddef); \
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if (aIID.Equals(kClassIID)) { \
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*aInstancePtr = (void*) this; \
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NS_ADDREF_THIS(); \
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return NS_OK; \
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} \
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if (aIID.Equals(kISupportsIID)) { \
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*aInstancePtr = (void*) ((nsISupports*)this); \
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NS_ADDREF_THIS(); \
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return NS_OK; \
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} \
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if (aIID.Equals(kIsThreadsafeIID)) { \
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return NS_OK; \
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} \
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return NS_NOINTERFACE; \
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}
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#else /* !NS_DEBUG */
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#define NS_VERIFY_THREADSAFE_INTERFACE(_iface)
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#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
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NS_IMPL_QUERY_INTERFACE(_class, _classiiddef)
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#endif /* !NS_DEBUG */
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/**
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* Convenience macro for implementing all nsISupports methods for
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* a simple class.
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|
* @param _class The name of the class implementing the method
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* @param _classiiddef The name of the #define symbol that defines the IID
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|
* for the class (e.g. NS_ISUPPORTS_IID)
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*/
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#define NS_IMPL_THREADSAFE_ISUPPORTS(_class,_classiiddef) \
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NS_IMPL_THREADSAFE_ADDREF(_class) \
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NS_IMPL_THREADSAFE_RELEASE(_class) \
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NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef)
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#else /* !NS_MT_SUPPORTED */
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#define NS_LOCK_INSTANCE()
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#define NS_UNLOCK_INSTANCE()
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#define NS_IMPL_THREADSAFE_ADDREF(_class) NS_IMPL_ADDREF(_class)
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#define NS_IMPL_THREADSAFE_RELEASE(_class) NS_IMPL_RELEASE(_class)
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#define NS_VERIFY_THREADSAFE_INTERFACE(_iface)
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#define NS_IMPL_THREADSAFE_QUERY_INTERFACE(_class,_classiiddef) \
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NS_IMPL_QUERY_INTERFACE(_class, _classiiddef)
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#define NS_IMPL_THREADSAFE_ISUPPORTS(_class,_classiiddef) \
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NS_IMPL_ADDREF(_class) \
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NS_IMPL_RELEASE(_class) \
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NS_IMPL_QUERY_INTERFACE(_class,_classiiddef)
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#endif /* !NS_MT_SUPPORTED */
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/*@}*/
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#endif /* nsISupports_h___ */
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