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gecko-dev/xpcom/tests/TestCOMPtr.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <assert.h>
#include <stdio.h>
#include "nsCOMPtr.h"
#include "nsISupports.h"
#define NS_IFOO_IID \
{ 0x6f7652e0, 0xee43, 0x11d1, \
{ 0x9c, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
class IFoo : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IFOO_IID)
public:
IFoo();
// virtual dtor because IBar uses our Release()
virtual ~IFoo();
NS_IMETHOD_(nsrefcnt) AddRef();
NS_IMETHOD_(nsrefcnt) Release();
NS_IMETHOD QueryInterface( const nsIID&, void** );
static void print_totals();
private:
unsigned int refcount_;
static unsigned int total_constructions_;
static unsigned int total_destructions_;
};
NS_DEFINE_STATIC_IID_ACCESSOR(IFoo, NS_IFOO_IID)
class IBar;
// some types I'll need
typedef unsigned long NS_RESULT;
// some functions I'll need (and define below)
nsresult CreateIFoo( void** );
nsresult CreateIBar( void** result );
void AnIFooPtrPtrContext( IFoo** );
void AnISupportsPtrPtrContext( nsISupports** );
void AVoidPtrPtrContext( void** );
void set_a_IFoo( nsCOMPtr<IFoo>* result );
nsCOMPtr<IFoo> return_a_IFoo();
unsigned int IFoo::total_constructions_;
unsigned int IFoo::total_destructions_;
class test_message
{
public:
test_message()
{
printf("BEGIN unit tests for |nsCOMPtr|, compiled " __DATE__ "\n");
}
~test_message()
{
IFoo::print_totals();
printf("END unit tests for |nsCOMPtr|.\n");
}
};
test_message gTestMessage;
/*
...
*/
void
IFoo::print_totals()
{
printf("total constructions/destructions --> %d/%d\n",
total_constructions_, total_destructions_);
}
IFoo::IFoo()
: refcount_(0)
{
++total_constructions_;
printf(" new IFoo@%p [#%d]\n",
static_cast<void*>(this), total_constructions_);
}
IFoo::~IFoo()
{
++total_destructions_;
printf("IFoo@%p::~IFoo() [#%d]\n",
static_cast<void*>(this), total_destructions_);
}
nsrefcnt
IFoo::AddRef()
{
++refcount_;
printf("IFoo@%p::AddRef(), refcount --> %d\n",
static_cast<void*>(this), refcount_);
return refcount_;
}
nsrefcnt
IFoo::Release()
{
int newcount = --refcount_;
if ( newcount == 0 )
printf(">>");
printf("IFoo@%p::Release(), refcount --> %d\n",
static_cast<void*>(this), refcount_);
if ( newcount == 0 )
{
printf(" delete IFoo@%p\n", static_cast<void*>(this));
printf("<<IFoo@%p::Release()\n", static_cast<void*>(this));
delete this;
}
return newcount;
}
nsresult
IFoo::QueryInterface( const nsIID& aIID, void** aResult )
{
printf("IFoo@%p::QueryInterface()\n", static_cast<void*>(this));
nsISupports* rawPtr = 0;
nsresult status = NS_OK;
if ( aIID.Equals(GetIID()) )
rawPtr = this;
else
{
nsID iid_of_ISupports = NS_ISUPPORTS_IID;
if ( aIID.Equals(iid_of_ISupports) )
rawPtr = static_cast<nsISupports*>(this);
else
status = NS_ERROR_NO_INTERFACE;
}
NS_IF_ADDREF(rawPtr);
*aResult = rawPtr;
return status;
}
nsresult
CreateIFoo( void** result )
// a typical factory function (that calls AddRef)
{
printf(">>CreateIFoo() --> ");
IFoo* foop = new IFoo;
printf("IFoo@%p\n", static_cast<void*>(foop));
foop->AddRef();
*result = foop;
printf("<<CreateIFoo()\n");
return 0;
}
void
set_a_IFoo( nsCOMPtr<IFoo>* result )
{
printf(">>set_a_IFoo()\n");
assert(result);
nsCOMPtr<IFoo> foop( do_QueryInterface(new IFoo) );
*result = foop;
printf("<<set_a_IFoo()\n");
}
nsCOMPtr<IFoo>
return_a_IFoo()
{
printf(">>return_a_IFoo()\n");
nsCOMPtr<IFoo> foop( do_QueryInterface(new IFoo) );
printf("<<return_a_IFoo()\n");
return foop;
}
#define NS_IBAR_IID \
{ 0x6f7652e1, 0xee43, 0x11d1, \
{ 0x9c, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
class IBar : public IFoo
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IBAR_IID)
public:
IBar();
virtual ~IBar();
NS_IMETHOD QueryInterface( const nsIID&, void** );
};
NS_DEFINE_STATIC_IID_ACCESSOR(IBar, NS_IBAR_IID)
IBar::IBar()
{
printf(" new IBar@%p\n", static_cast<void*>(this));
}
IBar::~IBar()
{
printf("IBar@%p::~IBar()\n", static_cast<void*>(this));
}
nsresult
IBar::QueryInterface( const nsID& aIID, void** aResult )
{
printf("IBar@%p::QueryInterface()\n", static_cast<void*>(this));
nsISupports* rawPtr = 0;
nsresult status = NS_OK;
if ( aIID.Equals(GetIID()) )
rawPtr = this;
else if ( aIID.Equals(NS_GET_IID(IFoo)) )
rawPtr = static_cast<IFoo*>(this);
else
{
nsID iid_of_ISupports = NS_ISUPPORTS_IID;
if ( aIID.Equals(iid_of_ISupports) )
rawPtr = static_cast<nsISupports*>(this);
else
status = NS_ERROR_NO_INTERFACE;
}
NS_IF_ADDREF(rawPtr);
*aResult = rawPtr;
return status;
}
nsresult
CreateIBar( void** result )
// a typical factory function (that calls AddRef)
{
printf(">>CreateIBar() --> ");
IBar* barp = new IBar;
printf("IBar@%p\n", static_cast<void*>(barp));
barp->AddRef();
*result = barp;
printf("<<CreateIBar()\n");
return 0;
}
void
AnIFooPtrPtrContext( IFoo** )
{
}
void
AVoidPtrPtrContext( void** )
{
}
void
AnISupportsPtrPtrContext( nsISupports** )
{
}
static
nsresult
TestBloat_Raw_Unsafe()
{
IBar* barP = 0;
nsresult result = CreateIBar(reinterpret_cast<void**>(&barP));
if ( barP )
{
IFoo* fooP = 0;
if ( NS_SUCCEEDED( result = barP->QueryInterface(NS_GET_IID(IFoo), reinterpret_cast<void**>(&fooP)) ) )
{
fooP->print_totals();
NS_RELEASE(fooP);
}
NS_RELEASE(barP);
}
return result;
}
static
nsresult
TestBloat_Smart()
{
nsCOMPtr<IBar> barP;
nsresult result = CreateIBar( getter_AddRefs(barP) );
nsCOMPtr<IFoo> fooP( do_QueryInterface(barP, &result) );
if ( fooP )
fooP->print_totals();
return result;
}
nsCOMPtr<IFoo> gFoop;
int
main()
{
printf(">>main()\n");
printf("sizeof(nsCOMPtr<IFoo>) --> %u\n", unsigned(sizeof(nsCOMPtr<IFoo>)));
TestBloat_Raw_Unsafe();
TestBloat_Smart();
{
printf("\n### Test 1: will a |nsCOMPtr| call |AddRef| on a pointer assigned into it?\n");
nsCOMPtr<IFoo> foop( do_QueryInterface(new IFoo) );
printf("\n### Test 2: will a |nsCOMPtr| |Release| its old pointer when a new one is assigned in?\n");
foop = do_QueryInterface(new IFoo);
// [Shouldn't compile] Is it a compile time error to try to |AddRef| by hand?
//foop->AddRef();
// [Shouldn't compile] Is it a compile time error to try to |Release| be hand?
//foop->Release();
// [Shouldn't compile] Is it a compile time error to try to |delete| an |nsCOMPtr|?
//delete foop;
printf("\n### Test 3: can you |AddRef| if you must?\n");
static_cast<IFoo*>(foop)->AddRef();
printf("\n### Test 4: can you |Release| if you must?\n");
static_cast<IFoo*>(foop)->Release();
printf("\n### Test 5: will a |nsCOMPtr| |Release| when it goes out of scope?\n");
}
{
printf("\n### Test 6: will a |nsCOMPtr| call the correct destructor?\n");
nsCOMPtr<IFoo> foop( do_QueryInterface(new IBar) );
}
{
printf("\n### Test 7: can you compare one |nsCOMPtr| with another [!=]?\n");
nsCOMPtr<IFoo> foo1p( do_QueryInterface(new IFoo) );
// [Shouldn't compile] Is it a compile time error to omit |getter_[doesnt_]AddRef[s]|?
//AnIFooPtrPtrContext(&foo1p);
// [Shouldn't compile] Is it a compile time error to omit |getter_[doesnt_]AddRef[s]|?
//AVoidPtrPtrContext(&foo1p);
nsCOMPtr<IFoo> foo2p( do_QueryInterface(new IFoo) );
if ( foo1p != foo2p )
printf("foo1p != foo2p\n");
else
printf("foo1p == foo2p\n");
printf("\n### Test 7.5: can you compare a |nsCOMPtr| with NULL, 0, nsnull [!=]?\n");
if ( foo1p != 0 )
printf("foo1p != 0\n");
if ( 0 != foo1p )
printf("0 != foo1p\n");
if ( foo1p == 0 )
printf("foo1p == 0\n");
if ( 0 == foo1p )
printf("0 == foo1p\n");
IFoo* raw_foo2p = foo2p.get();
printf("\n### Test 8: can you compare a |nsCOMPtr| with a raw interface pointer [!=]?\n");
if ( foo1p.get() != raw_foo2p )
printf("foo1p != raw_foo2p\n");
else
printf("foo1p == raw_foo2p\n");
printf("\n### Test 9: can you assign one |nsCOMPtr| into another?\n");
foo1p = foo2p;
printf("\n### Test 10: can you compare one |nsCOMPtr| with another [==]?\n");
if ( foo1p == foo2p )
printf("foo1p == foo2p\n");
else
printf("foo1p != foo2p\n");
printf("\n### Test 11: can you compare a |nsCOMPtr| with a raw interface pointer [==]?\n");
if ( raw_foo2p == foo2p.get() )
printf("raw_foo2p == foo2p\n");
else
printf("raw_foo2p != foo2p\n");
#if 1
printf("\n### Test 11.5: can you compare a |nsCOMPtr| with a raw interface pointer [==]?\n");
if ( nsCOMPtr<IFoo>( raw_foo2p ) == foo2p )
printf("raw_foo2p == foo2p\n");
else
printf("raw_foo2p != foo2p\n");
#endif
printf("\n### Test 12: bare pointer test?\n");
if ( foo1p )
printf("foo1p is not NULL\n");
else
printf("foo1p is NULL\n");
printf("\n### Test 13: numeric pointer test?\n");
if ( foo1p == 0 )
printf("foo1p is NULL\n");
else
printf("foo1p is not NULL\n");
#if 0
if ( foo1p == 1 )
printf("foo1p allowed compare with in\n");
#endif
printf("\n### Test 14: how about when two |nsCOMPtr|s referring to the same object go out of scope?\n");
}
{
printf("\n### Test 15,16 ...setup...\n");
IFoo* raw_foo1p = new IFoo;
raw_foo1p->AddRef();
IFoo* raw_foo2p = new IFoo;
raw_foo2p->AddRef();
printf("\n### Test 15: what if I don't want to |AddRef| when I construct?\n");
nsCOMPtr<IFoo> foo1p( dont_AddRef(raw_foo1p) );
//nsCOMPtr<IFoo> foo1p = dont_AddRef(raw_foo1p);
printf("\n### Test 16: what if I don't want to |AddRef| when I assign in?\n");
nsCOMPtr<IFoo> foo2p;
foo2p = dont_AddRef(raw_foo2p);
}
{
printf("\n### setup for Test 17\n");
nsCOMPtr<IFoo> foop;
printf("### Test 17: basic parameter behavior?\n");
CreateIFoo( nsGetterAddRefs<IFoo>(foop) );
}
printf("### End Test 17\n");
{
printf("\n### setup for Test 18\n");
nsCOMPtr<IFoo> foop;
printf("### Test 18: basic parameter behavior, using the short form?\n");
CreateIFoo( getter_AddRefs(foop) );
}
printf("### End Test 18\n");
{
printf("\n### setup for Test 19, 20\n");
nsCOMPtr<IFoo> foop;
printf("### Test 19: reference parameter behavior?\n");
set_a_IFoo(address_of(foop));
printf("### Test 20: return value behavior?\n");
foop = return_a_IFoo();
}
printf("### End Test 19, 20\n");
{
printf("\n### setup for Test 21\n");
nsCOMPtr<IFoo> fooP;
printf("### Test 21: is |QueryInterface| called on assigning in a raw pointer?\n");
fooP = do_QueryInterface(new IFoo);
}
printf("### End Test 21\n");
{
printf("\n### setup for Test 22\n");
nsCOMPtr<IFoo> fooP;
fooP = do_QueryInterface(new IFoo);
nsCOMPtr<IFoo> foo2P;
printf("### Test 22: is |QueryInterface| _not_ called when assigning in a smart-pointer of the same type?\n");
foo2P = fooP;
}
printf("### End Test 22\n");
{
printf("\n### setup for Test 23\n");
nsCOMPtr<IBar> barP( do_QueryInterface(new IBar) );
printf("### Test 23: is |QueryInterface| called when assigning in a smart-pointer of a different type?\n");
nsCOMPtr<IFoo> fooP( do_QueryInterface(barP) );
if ( fooP )
printf("an IBar* is an IFoo*\n");
}
printf("### End Test 23\n");
{
printf("\n### setup for Test 24\n");
nsCOMPtr<IFoo> fooP( do_QueryInterface(new IFoo) );
printf("### Test 24: does |forget| avoid an AddRef/Release when assigning to another nsCOMPtr?\n");
nsCOMPtr<IFoo> fooP2( fooP.forget() );
}
printf("### End Test 24\n");
{
nsCOMPtr<IFoo> fooP;
AnIFooPtrPtrContext( getter_AddRefs(fooP) );
AVoidPtrPtrContext( getter_AddRefs(fooP) );
AnISupportsPtrPtrContext( getter_AddRefs(fooP) );
}
{
nsCOMPtr<nsISupports> supportsP;
AVoidPtrPtrContext( getter_AddRefs(supportsP) );
AnISupportsPtrPtrContext( getter_AddRefs(supportsP) );
}
printf("\n### Test 25: will a static |nsCOMPtr| |Release| before program termination?\n");
gFoop = do_QueryInterface(new IFoo);
printf("<<main()\n");
return 0;
}
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