[MacRuby] #1485: Using MacRuby to invoke a Obj-C variadic method leads crash

[MacRuby]

#1485: Using MacRuby to invoke a Obj-C variadic method leads crash
--------------------------------+-------------------------------------------
 Reporter:  xareelee@…          |       Owner:  lsansonetti@…        
     Type:  defect              |      Status:  new                  
 Priority:  blocker             |   Milestone:                       
Component:  MacRuby             |    Keywords:  variadic method      
--------------------------------+-------------------------------------------
Description changed by watson1978@…:

Old description:

> I got an Obj-C class like this:
> ============================
> @interface Foo
> /// this method would print the variables.
> + (void) log: (id) firstObj, ...;    // Obj-C variadic method. Using nil
> at the end of args.
> @end
>
> @implementation Foo
> + (void) log: (id) firstObj, ...{
>   va_list ap
>   va_start (ap, firstObj)
>   for (id obj = firstObj; obj != nil; obj = va_args(ap, id) ){
>     NSLog(@"%@", obj);
>   }
>   va_end (ap)
> }
> @end
> ============================
>
> If I call the method using Obj-C like this:
>   [Foo log: @"1", @"2", @"3", nil];
>
> The console would print:
> => 1
> => 2
> => 3
>

> But if I call the method using MacRuby like this:
>   Foo.log ("1", "2", "3", nil)
>
> The Console would print:
> => 1
> => 1    // Yes, it prints the first argument twice!!
> then crash!
>
> Did I do it wrong? Or it is a bug there?

New description:

 I got an Obj-C class like this:
 ============================
 {{{
 @interface Foo
 /// this method would print the variables.
 + (void) log: (id) firstObj, ...;    // Obj-C variadic method. Using nil
 at the end of args.
 @end

 @implementation Foo
 + (void) log: (id) firstObj, ...{
   va_list ap
   va_start (ap, firstObj)
   for (id obj = firstObj; obj != nil; obj = va_args(ap, id) ){
     NSLog(@"%@", obj);
   }
   va_end (ap)
 }
 @end
 }}}
 ============================

 If I call the method using Obj-C like this:
   [Foo log: @"1", @"2", @"3", nil];

 The console would print:
 {{{
 => 1
 => 2
 => 3
 }}}

 But if I call the method using MacRuby like this:
   Foo.log ("1", "2", "3", nil)

 The Console would print:
 {{{
 => 1
 => 1    // Yes, it prints the first argument twice!!
 }}}
 then crash!

 Did I do it wrong? Or it is a bug there?

--

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/1485#comment:1>
MacRuby <http://macruby.org/>