mirror of
https://github.com/mozilla/gecko-dev.git
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550 lines
12 KiB
C++
550 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include <assert.h>
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#include <stdio.h>
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#include "nsCOMPtr.h"
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#include "nsISupports.h"
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#include "mozilla/Unused.h"
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#define NS_IFOO_IID \
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{ 0x6f7652e0, 0xee43, 0x11d1, \
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{ 0x9c, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
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class IFoo : public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IFOO_IID)
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public:
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IFoo();
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// virtual dtor because IBar uses our Release()
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virtual ~IFoo();
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NS_IMETHOD_(MozExternalRefCountType) AddRef();
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NS_IMETHOD_(MozExternalRefCountType) Release();
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NS_IMETHOD QueryInterface( const nsIID&, void** );
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static void print_totals();
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private:
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unsigned int refcount_;
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static unsigned int total_constructions_;
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static unsigned int total_destructions_;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(IFoo, NS_IFOO_IID)
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class IBar;
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// some types I'll need
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typedef unsigned long NS_RESULT;
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// some functions I'll need (and define below)
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nsresult CreateIFoo( void** );
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nsresult CreateIBar( void** result );
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void AnIFooPtrPtrContext( IFoo** );
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void AnISupportsPtrPtrContext( nsISupports** );
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void AVoidPtrPtrContext( void** );
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void set_a_IFoo( nsCOMPtr<IFoo>* result );
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nsCOMPtr<IFoo> return_a_IFoo();
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unsigned int IFoo::total_constructions_;
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unsigned int IFoo::total_destructions_;
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class test_message
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{
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public:
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test_message()
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{
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printf("BEGIN unit tests for |nsCOMPtr|, compiled " __DATE__ "\n");
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}
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~test_message()
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{
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IFoo::print_totals();
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printf("END unit tests for |nsCOMPtr|.\n");
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}
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};
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test_message gTestMessage;
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/*
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...
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*/
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void
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IFoo::print_totals()
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{
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printf("total constructions/destructions --> %d/%d\n",
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total_constructions_, total_destructions_);
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}
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IFoo::IFoo()
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: refcount_(0)
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{
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++total_constructions_;
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printf(" new IFoo@%p [#%d]\n",
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static_cast<void*>(this), total_constructions_);
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}
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IFoo::~IFoo()
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{
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++total_destructions_;
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printf("IFoo@%p::~IFoo() [#%d]\n",
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static_cast<void*>(this), total_destructions_);
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}
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MozExternalRefCountType
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IFoo::AddRef()
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{
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++refcount_;
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printf("IFoo@%p::AddRef(), refcount --> %d\n",
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static_cast<void*>(this), refcount_);
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return refcount_;
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}
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MozExternalRefCountType
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IFoo::Release()
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{
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int newcount = --refcount_;
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if ( newcount == 0 )
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printf(">>");
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printf("IFoo@%p::Release(), refcount --> %d\n",
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static_cast<void*>(this), refcount_);
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if ( newcount == 0 )
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{
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printf(" delete IFoo@%p\n", static_cast<void*>(this));
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printf("<<IFoo@%p::Release()\n", static_cast<void*>(this));
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delete this;
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}
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return newcount;
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}
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nsresult
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IFoo::QueryInterface( const nsIID& aIID, void** aResult )
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{
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printf("IFoo@%p::QueryInterface()\n", static_cast<void*>(this));
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nsISupports* rawPtr = 0;
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nsresult status = NS_OK;
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if ( aIID.Equals(NS_GET_IID(IFoo)) )
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rawPtr = this;
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else
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{
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nsID iid_of_ISupports = NS_ISUPPORTS_IID;
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if ( aIID.Equals(iid_of_ISupports) )
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rawPtr = static_cast<nsISupports*>(this);
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else
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status = NS_ERROR_NO_INTERFACE;
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}
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NS_IF_ADDREF(rawPtr);
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*aResult = rawPtr;
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return status;
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}
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nsresult
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CreateIFoo( void** result )
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// a typical factory function (that calls AddRef)
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{
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printf(">>CreateIFoo() --> ");
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IFoo* foop = new IFoo;
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printf("IFoo@%p\n", static_cast<void*>(foop));
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foop->AddRef();
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*result = foop;
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printf("<<CreateIFoo()\n");
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return NS_OK;
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}
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void
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set_a_IFoo( nsCOMPtr<IFoo>* result )
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{
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printf(">>set_a_IFoo()\n");
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assert(result);
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nsCOMPtr<IFoo> foop( do_QueryInterface(new IFoo) );
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*result = foop;
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printf("<<set_a_IFoo()\n");
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}
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nsCOMPtr<IFoo>
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return_a_IFoo()
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{
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printf(">>return_a_IFoo()\n");
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nsCOMPtr<IFoo> foop( do_QueryInterface(new IFoo) );
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printf("<<return_a_IFoo()\n");
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return foop;
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}
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#define NS_IBAR_IID \
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{ 0x6f7652e1, 0xee43, 0x11d1, \
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{ 0x9c, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
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class IBar : public IFoo
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IBAR_IID)
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public:
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IBar();
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virtual ~IBar();
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NS_IMETHOD QueryInterface( const nsIID&, void** );
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(IBar, NS_IBAR_IID)
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IBar::IBar()
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{
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printf(" new IBar@%p\n", static_cast<void*>(this));
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}
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IBar::~IBar()
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{
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printf("IBar@%p::~IBar()\n", static_cast<void*>(this));
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}
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nsresult
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IBar::QueryInterface( const nsID& aIID, void** aResult )
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{
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printf("IBar@%p::QueryInterface()\n", static_cast<void*>(this));
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nsISupports* rawPtr = 0;
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nsresult status = NS_OK;
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if ( aIID.Equals(NS_GET_IID(IBar)) )
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rawPtr = this;
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else if ( aIID.Equals(NS_GET_IID(IFoo)) )
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rawPtr = static_cast<IFoo*>(this);
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else
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{
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nsID iid_of_ISupports = NS_ISUPPORTS_IID;
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if ( aIID.Equals(iid_of_ISupports) )
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rawPtr = static_cast<nsISupports*>(this);
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else
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status = NS_ERROR_NO_INTERFACE;
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}
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NS_IF_ADDREF(rawPtr);
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*aResult = rawPtr;
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return status;
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}
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nsresult
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CreateIBar( void** result )
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// a typical factory function (that calls AddRef)
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{
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printf(">>CreateIBar() --> ");
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IBar* barp = new IBar;
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printf("IBar@%p\n", static_cast<void*>(barp));
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barp->AddRef();
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*result = barp;
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printf("<<CreateIBar()\n");
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return NS_OK;
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}
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void
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AnIFooPtrPtrContext( IFoo** )
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{
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}
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void
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AVoidPtrPtrContext( void** )
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{
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}
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void
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AnISupportsPtrPtrContext( nsISupports** )
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{
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}
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static
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nsresult
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TestBloat_Raw_Unsafe()
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{
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IBar* barP = 0;
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nsresult result = CreateIBar(reinterpret_cast<void**>(&barP));
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if ( barP )
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{
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IFoo* fooP = 0;
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if ( NS_SUCCEEDED( result = barP->QueryInterface(NS_GET_IID(IFoo), reinterpret_cast<void**>(&fooP)) ) )
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{
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fooP->print_totals();
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NS_RELEASE(fooP);
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}
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NS_RELEASE(barP);
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}
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return result;
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}
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static
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nsresult
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TestBloat_Smart()
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{
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nsCOMPtr<IBar> barP;
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nsresult result = CreateIBar( getter_AddRefs(barP) );
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nsCOMPtr<IFoo> fooP( do_QueryInterface(barP, &result) );
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if ( fooP )
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fooP->print_totals();
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return result;
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}
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nsCOMPtr<IFoo> gFoop;
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int
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main()
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{
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printf(">>main()\n");
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printf("sizeof(nsCOMPtr<IFoo>) --> %u\n", unsigned(sizeof(nsCOMPtr<IFoo>)));
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TestBloat_Raw_Unsafe();
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TestBloat_Smart();
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{
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printf("\n### Test 1: will a |nsCOMPtr| call |AddRef| on a pointer assigned into it?\n");
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nsCOMPtr<IFoo> foop( do_QueryInterface(new IFoo) );
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printf("\n### Test 2: will a |nsCOMPtr| |Release| its old pointer when a new one is assigned in?\n");
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foop = do_QueryInterface(new IFoo);
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// [Shouldn't compile] Is it a compile time error to try to |AddRef| by hand?
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//foop->AddRef();
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// [Shouldn't compile] Is it a compile time error to try to |Release| be hand?
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//foop->Release();
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// [Shouldn't compile] Is it a compile time error to try to |delete| an |nsCOMPtr|?
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//delete foop;
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printf("\n### Test 3: can you |AddRef| if you must?\n");
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static_cast<IFoo*>(foop)->AddRef();
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printf("\n### Test 4: can you |Release| if you must?\n");
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static_cast<IFoo*>(foop)->Release();
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printf("\n### Test 5: will a |nsCOMPtr| |Release| when it goes out of scope?\n");
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}
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{
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printf("\n### Test 6: will a |nsCOMPtr| call the correct destructor?\n");
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nsCOMPtr<IFoo> foop( do_QueryInterface(new IBar) );
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mozilla::Unused << foop;
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}
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{
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printf("\n### Test 7: can you compare one |nsCOMPtr| with another [!=]?\n");
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nsCOMPtr<IFoo> foo1p( do_QueryInterface(new IFoo) );
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// [Shouldn't compile] Is it a compile time error to omit |getter_[doesnt_]AddRef[s]|?
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//AnIFooPtrPtrContext(&foo1p);
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// [Shouldn't compile] Is it a compile time error to omit |getter_[doesnt_]AddRef[s]|?
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//AVoidPtrPtrContext(&foo1p);
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nsCOMPtr<IFoo> foo2p( do_QueryInterface(new IFoo) );
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if ( foo1p != foo2p )
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printf("foo1p != foo2p\n");
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else
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printf("foo1p == foo2p\n");
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IFoo* raw_foo2p = foo2p.get();
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printf("\n### Test 8: can you compare a |nsCOMPtr| with a raw interface pointer [!=]?\n");
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if ( foo1p.get() != raw_foo2p )
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printf("foo1p != raw_foo2p\n");
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else
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printf("foo1p == raw_foo2p\n");
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printf("\n### Test 9: can you assign one |nsCOMPtr| into another?\n");
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foo1p = foo2p;
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printf("\n### Test 10: can you compare one |nsCOMPtr| with another [==]?\n");
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if ( foo1p == foo2p )
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printf("foo1p == foo2p\n");
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else
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printf("foo1p != foo2p\n");
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printf("\n### Test 11: can you compare a |nsCOMPtr| with a raw interface pointer [==]?\n");
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if ( raw_foo2p == foo2p.get() )
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printf("raw_foo2p == foo2p\n");
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else
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printf("raw_foo2p != foo2p\n");
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#if 1
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printf("\n### Test 11.5: can you compare a |nsCOMPtr| with a raw interface pointer [==]?\n");
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if ( nsCOMPtr<IFoo>( raw_foo2p ) == foo2p )
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printf("raw_foo2p == foo2p\n");
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else
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printf("raw_foo2p != foo2p\n");
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#endif
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printf("\n### Test 12: bare pointer test?\n");
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if ( foo1p )
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printf("foo1p is not NULL\n");
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else
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printf("foo1p is NULL\n");
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#if 0
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if ( foo1p == 1 )
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printf("foo1p allowed compare with in\n");
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#endif
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printf("\n### Test 13: how about when two |nsCOMPtr|s referring to the same object go out of scope?\n");
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}
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{
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printf("\n### Test 14,15 ...setup...\n");
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IFoo* raw_foo1p = new IFoo;
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raw_foo1p->AddRef();
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IFoo* raw_foo2p = new IFoo;
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raw_foo2p->AddRef();
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printf("\n### Test 14: what if I don't want to |AddRef| when I construct?\n");
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nsCOMPtr<IFoo> foo1p( dont_AddRef(raw_foo1p) );
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//nsCOMPtr<IFoo> foo1p = dont_AddRef(raw_foo1p);
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printf("\n### Test 15: what if I don't want to |AddRef| when I assign in?\n");
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nsCOMPtr<IFoo> foo2p;
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foo2p = dont_AddRef(raw_foo2p);
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}
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{
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printf("\n### setup for Test 16\n");
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nsCOMPtr<IFoo> foop;
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printf("### Test 16: basic parameter behavior?\n");
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CreateIFoo( nsGetterAddRefs<IFoo>(foop) );
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}
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printf("### End Test 16\n");
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{
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printf("\n### setup for Test 17\n");
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nsCOMPtr<IFoo> foop;
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printf("### Test 17: basic parameter behavior, using the short form?\n");
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CreateIFoo( getter_AddRefs(foop) );
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}
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printf("### End Test 17\n");
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{
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printf("\n### setup for Test 18, 19\n");
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nsCOMPtr<IFoo> foop;
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printf("### Test 18: reference parameter behavior?\n");
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set_a_IFoo(address_of(foop));
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printf("### Test 19: return value behavior?\n");
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foop = return_a_IFoo();
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}
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printf("### End Test 18, 19\n");
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{
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printf("\n### setup for Test 20\n");
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nsCOMPtr<IFoo> fooP;
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printf("### Test 20: is |QueryInterface| called on assigning in a raw pointer?\n");
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fooP = do_QueryInterface(new IFoo);
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}
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printf("### End Test 20\n");
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{
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printf("\n### setup for Test 21\n");
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nsCOMPtr<IFoo> fooP;
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fooP = do_QueryInterface(new IFoo);
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nsCOMPtr<IFoo> foo2P;
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printf("### Test 21: is |QueryInterface| _not_ called when assigning in a smart-pointer of the same type?\n");
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foo2P = fooP;
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}
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printf("### End Test 21\n");
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{
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printf("\n### setup for Test 22\n");
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nsCOMPtr<IBar> barP( do_QueryInterface(new IBar) );
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printf("### Test 22: is |QueryInterface| called when assigning in a smart-pointer of a different type?\n");
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nsCOMPtr<IFoo> fooP( do_QueryInterface(barP) );
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if ( fooP )
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printf("an IBar* is an IFoo*\n");
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}
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printf("### End Test 22\n");
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{
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printf("\n### setup for Test 23\n");
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nsCOMPtr<IFoo> fooP( do_QueryInterface(new IFoo) );
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printf("### Test 23: does |forget| avoid an AddRef/Release when assigning to another nsCOMPtr?\n");
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nsCOMPtr<IFoo> fooP2( fooP.forget() );
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}
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printf("### End Test 23\n");
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{
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nsCOMPtr<IFoo> fooP;
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AnIFooPtrPtrContext( getter_AddRefs(fooP) );
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AVoidPtrPtrContext( getter_AddRefs(fooP) );
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}
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{
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nsCOMPtr<nsISupports> supportsP;
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AVoidPtrPtrContext( getter_AddRefs(supportsP) );
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AnISupportsPtrPtrContext( getter_AddRefs(supportsP) );
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}
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printf("\n### Test 24: will a static |nsCOMPtr| |Release| before program termination?\n");
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gFoop = do_QueryInterface(new IFoo);
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printf("<<main()\n");
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return 0;
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}
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