Re: big memory leak in GSString

[Pirmin Braun]

Am Mon, 7 Jan 2013 23:06:22 +0000
schrieb Tom Davie <address@hidden> :

> 
> On 7 Jan 2013, at 22:50, Pirmin Braun <address@hidden> wrote:
> 
> > Am Mon, 7 Jan 2013 22:28:13 +0000
> > schrieb Tom Davie <address@hidden> :
> > 
> >> Instead, simply try to reduce this to a simple test case in which the 
> >> string is not deallocated, yet all autorelease pools have been popped, and 
> >> all allocs/retains balanced.
> >> 
> > 
> > ok, here I've got a simple test:
> > svn checkout -r HEAD --no-auth-cache 
> > svn://svn.intars.at/intars/Local/Projects/TestTool --username anonsvn 
> > --password 'intars'
> > cd TestTool
> > make install
> > 
> > cd /usr/GNUstep/Local/Tools
> > ./TestTool
> > 
> > -> 2013-01-07 23:49:17.336 TestTool[23179] TestTool: first has retainCount 
> > of 2
> > 
> > 
> > wheras on WO windows it says
> >> Running 'TestTool.exe'...
> > Jan 07 23:35:45 TestTool[300] TestTool: first has retainCount of 1
> >> Finished running 'TestTool.exe'.
> > 
> > 
> > the .m looks like this:
> > #import <Foundation/Foundation.h>
> > 
> > int
> > main(int argc, char **argv)
> > {
> >    NSString *s = @"first|second|third",*s1;
> >    NSArray *a;
> >    NSAutoreleasePool *pool =[NSAutoreleasePool new];
> > 
> >    a = [s componentsSeparatedByString:@"|"];
> >    s1 = [a objectAtIndex:0];
> > 
> >    NSLog(([NSString stringWithFormat:@"TestTool: %@ has retainCount of 
> > %i",s1,[s1 retainCount]]));
> > 
> >    [pool release];
> >    exit (0);
> >    return 0;
> > }
> 
> This test is not demonstrating anything beyond a different implementation of 
> componentsSeparatedByString:.  s1 is retained by *at least* a, it may also 
> (and likely is) be retained by the autoreleasepool until it is drained.
> 
> Now try retaining s1, and logging the retain count after the autoreleasepool 
> drain.

ok, Code:
#import <Foundation/Foundation.h>

int
main(int argc, char **argv)
{
    NSString *s = @"first|second|third",*s1;
    NSArray *a;
    NSAutoreleasePool *pool =[NSAutoreleasePool new];

    a = [s componentsSeparatedByString:@"|"];
    s1 = [a objectAtIndex:0];

    NSLog(([NSString stringWithFormat:@"%@ has retainCount of %i",s1,[s1 
retainCount]]));

    [s1 retain];
    NSLog(([NSString stringWithFormat:@"after [s1 retain]: %@ has retainCount 
of %i",s1,[s1 retainCount]]));


    [pool release];

    NSLog(([[NSString alloc]initWithFormat:@"after [pool release]: %@ has 
retainCount of %i",s1,[s1 retainCount]]));

    exit (0);
    return 0;
}


WO:
> Running 'TestTool.exe'...
Jan 08 00:12:20 TestTool[2260] first has retainCount of 1
Jan 08 00:12:20 TestTool[2260] after [s1 retain]: first has retainCount of 2
Jan 08 00:12:20 TestTool[2260] after [pool release]: first has retainCount of 1
> Finished running 'TestTool.exe'.

GNUStep:
s15351252:/usr/GNUstep/Local/Tools# ./TestTool
2013-01-08 00:15:47.400 TestTool[23737] first has retainCount of 2
2013-01-08 00:15:47.405 TestTool[23737] after [s1 retain]: first has 
retainCount of 3
2013-01-08 00:15:47.405 TestTool[23737] after [pool release]: first has 
retainCount of 1


you're right, looks like the autoreleasePool retains the object in GNUStep; 


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