Question about message forwarding

[Issac Trotts]

Here is a test I wrote to track down a problem with message forwarding
in another program I'm writing.

// fowardingTest.m
#import <Foundation/Foundation.h>
#import <stdio.h>

@interface Delegate: NSObject
{

}
-(void)foo;
-(void)bar:(int)key;
-(void)baz:(NSNumber*)key;
@end

@implementation Delegate
-(void)foo
{
    printf("Delegate %p foo\n",self);
}

-(void)bar:(int)key
{
    printf("Delegate %p bar: %i\n",self,key);
}

-(void)baz:(NSNumber*)key
{
    printf("Delegate %p baz: %i\n",self,[key intValue]);
}
@end


@interface Forwarder: NSObject
{
    Delegate* delegate;
}
-(id)initWithDelegate:(Delegate*)d;
@end

@implementation Forwarder
-(id)initWithDelegate:(Delegate*)d
{
    if((self=[super init])==nil) { return nil ; }
    delegate = d;
    return self;
}

-(void)forwardInvocation:(NSInvocation*)invo
{
    [invo invokeWithTarget:delegate];
}

-(NSMethodSignature *)methodSignatureForSelector:(SEL)sel
{
    return [delegate methodSignatureForSelector:sel];
}
@end

int main()
{
    NSAutoreleasePool* pool = [NSAutoreleasePool new];
    Delegate* d = [Delegate new];
    Forwarder* f = [[Forwarder alloc] initWithDelegate:d];
    [f foo];
    [f bar:1234];
    [f baz:[NSNumber numberWithInt:1234]];
    [pool release];
    return 0;
}


Here is the output:

Delegate 0x8063bf0 foo
Delegate 0x8063bf0 bar: -1078528424
Segmentation fault

So I would like to know why bar does not show 1234.  Looking at a
stack trace, baz does get called, but I think the `key' argument is
corrupted, hence the crash.  So, why are the args getting trashed?

Thanks,
Issac