[MacRuby-devel] [MacRuby] #627: Obj-C exception raised within a rescue block are not catched

1 Mar 2010


      #627: Obj-C exception raised within a rescue block are not catched
----------------------------------------+-----------------------------------
 Reporter:  martinlagardette@…          |       Owner:  lsansonetti@…        
     Type:  defect                      |      Status:  new                  
 Priority:  major                       |   Milestone:                       
Component:  MacRuby                     |    Keywords:  rescue exception     
----------------------------------------+-----------------------------------
 This file:
 {{{
 #!ruby
 # test.rb
 begin
   begin
     raise
   rescue
     NSString.stringWithCString(nil)
   end
 rescue
   puts "rescued"
 end
 }}}
 Will produce the following:
 {{{
 #!sh
 $> macruby /tmp/test.rb
 uncaught Objective-C/C++ exception...
 2010-03-01 22:45:58.926 macruby[30392:903] *** Terminating app due to
 uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSString
 stringWithCString:]: NULL cString'
 *** Call stack at first throw:
 (
         0   CoreFoundation                      0x00007fff84f80444
 __exceptionPreprocess + 180
         1   libobjc.A.dylib                     0x00007fff84db80f3
 objc_exception_throw + 45
         2   CoreFoundation                      0x00007fff84f80267
 +[NSException raise:format:arguments:] + 103
         3   CoreFoundation                      0x00007fff84f801f4
 +[NSException raise:format:] + 148
         4   Foundation                          0x00007fff87f704ed
 +[NSString stringWithCString:] + 80
         5   ???                                 0x0000000101040385 0x0 +
 4312007557
         6   libmacruby.dylib                    0x0000000100174130
 rb_vm_dispatch + 2688
         7   ???                                 0x000000010104015d 0x0 +
 4312007005
         8   libmacruby.dylib                    0x0000000100184ebf
 rb_vm_run + 351
         9   libmacruby.dylib                    0x0000000100046459
 ruby_run_node + 73
         10  macruby                             0x0000000100000d28 main +
 152
         11  macruby                             0x0000000100000c88 start +
 52
         12  ???                                 0x0000000000000002 0x0 + 2
 )
 terminate called after throwing an instance of 'NSException'
 Abort trap
 }}}

 However, using pure Ruby exceptions works without issue:
 {{{
 #!ruby
 # test2.rb
 begin
   begin
     raise
   rescue
     raise
   end
 rescue
   puts "rescued"
 end
 }}}
 {{{
 #!sh
 $> macruby /tmp/test2.rb
 rescued
 }}}

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/627>
MacRuby <http://macruby.org/>