list (and bug) creation question

[Matthew M Murphy]

Group:

I am creating agents which each have two list instances... When I attempt
to acutally create the lists, however, I receive a perplexing runtime
error.  Below is the result of gdb, followed by the result of a backtrace:
(I suspect this may have something to do with when I am creating the
lists...)

--------------gdb output (sorry about the bad formatting)
GNU gdb 19991116 Copyright 1998 Free Software Foundation, Inc. GDB is free
software, covered by the GNU General Public License, and you are welcome
to change it and/or distribute copies of it under certain conditions. Type
"show copying" to see the conditions. There is absolutely no warranty for
GDB.  Type "show warranty" for details. This GDB was configured as
"i686-pc-linux-gnu"... (gdb) run Starting program:
/home/mmmurf/dev/pc1202/.libs/bug *** event raised for error:
InvalidArgument *** function: _i_Object_s__doesNotRecognize_(), file:
DefObject.m, line: 872 Bug does not recognize allocIVars:*** execution
terminating due to error Symbol.m:173 -[Error(c) _raiseEvent:]
 
Program received signal SIGABRT, Aborted. 0x404cf2d1 in __kill () from
/lib/libc.so.6 

----------backtrace

(gdb) backtrace #0 0x404cf2d1 in __kill () from
/lib/libc.so.6 #1 0x404cef0d in raise () from /lib/libc.so.6 #2 0x401eb219
in debugabort () at debugabort.c:9 #3 0x4019016b in
_i_Error_c__raiseEvent_ () at Symbol.m:173 #4 0x4018d138 in
_i_Object_s__doesNotRecognize_ (self=0x8108cd8, _cmd=0x401a4190,
sel=0x401e0b40)
    at DefObject.m:871 #5 0x4018ce5d in _i_Object_s__forward__
(self=0x8108cd8, _cmd=0x805bde8, aSel=0x401e0b40, argFrame=0xbffffb18)
    at DefObject.m:776 #6 0x401fade3 in __objc_forward (object=0x8108cd8,
sel=0x401e0b40, args=0xbffffb18) at sendmsg.c:571 #7 0x401fab47 in
__objc_word_forward (rcv=0x8108cd8, op=0x401e0b40) at sendmsg.c:499 #8
0x401c96ed in _c_List_any__createBegin_ (self=0x807bc28, _cmd=0x401a2e40,
aZone=0x8108cd8) at List.m:27 #9 0x4018880a in _c_CreateDrop_s__create_
(self=0x807bc28, _cmd=0x804bb58, aZone=0x8108cd8) at Create.m:24 #10
0x8048cbb in _i_Bug__createEnd (self=0x8108cd8, _cmd=0x804c1c8) at
Bug.m:24 #11 0x8049a79 in _i_ModelSwarm__buildObjects (self=0x80fb6a0,
_cmd=0x804be10) at ModelSwarm.m:95 #12 0x8049280 in
_i_ObserverSwarm__buildObjects (self=0x80fb7e0, _cmd=0x804bc48) at
ObserverSwarm.m:66 #13 0x80490dc in main (argc=1, argv=0xbffffcb4) at
main.m:30
(gdb)  

--------------------guilty method, I think... lexList and gramList are
declared as type id in the .h file. (this is a modification of SimpleBug)

// Bug.m SimpleBug 
#import "Bug.h" 
#import <random.h> 
#import <collections.h> 
@implementation Bug 

...
- createEnd {
  
  [super createEnd];
  
  worldXSize = [world getSizeX];
  worldYSize = [world getSizeY];
   
  lexList = [List create: self];
  gramList = [List create: self];
 
  
  return self; 
} 

...

I would appreciate any suggestions that anyone may have to offer.

-Matt


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