MW debugger div by 0 error on dbl click

MW debugger div by 0 error on dbl click

Post by Fred Dush » Mon, 01 Apr 1996 04:00:00

I experience division by zero errors if I double click on a pointer
in the variables pane of the debug window in CW8 MW Debug/MacOS 1.4.

I'm running system 7.1 on a Q610, 32-bit addressing, VM on.  I have
numerous extensions, including Drag and Drop and the Thread Manager.

The last time this happened, it thrashed my project, then the IDE.
Oddly, after a clean reboot (there should be a word for this
for us poor Mac programmers) -- ie, a reboot NOT as a consequence of
a system crash --  both the project and the IDE were fine.  Go figure.

Here's some disassembled code around the div 0 error from MacsBug:
(In this case, the pointer was to a character string (constant)).

Zero Divide at 40823AC6 _GetNewMBar+1C46
 Disassembling from 40823AAE
     +1C2E  40823AAE   EXT.L      D0                                      | 48C0
     +1C30  40823AB0   MOVE.W     $005E(A3),D7                            | 3E2B 005E
     +1C34  40823AB4   BEQ.S      _GetNewMBar+1C6E           ; 40823AEE   | 6738
     +1C36  40823AB6   MOVE.W     $0018(A3),D1                            | 322B 0018
     +1C3A  40823ABA   TST.W      $0050(A3)                               | 4A6B 0050
     +1C3E  40823ABE   BPL.S      _GetNewMBar+1C44           ; 40823AC4   | 6A04
     +1C40  40823AC0   TST.W      D1                                      | 4A41
     +1C42  40823AC2   BMI.S      _GetNewMBar+1C48           ; 40823AC8   | 6B04
     +1C44  40823AC4   DIVS.W     D1,D0                                   | 81C1
     +1C46  40823AC6  *BRA.S      _GetNewMBar+1C6E           ; 40823AEE   | 6026
     +1C48  40823AC8   MOVEA.L    $004A(A3),A0                            | 206B 004A
     +1C4C  40823ACC   MOVEA.L    (A0),A0                                 | 2050
     +1C4E  40823ACE   MOVEA.L    $0008(A0),A0                            | 2068 0008
     +1C52  40823AD2   MOVEA.L    (A0),A0                                 | 2050
     +1C54  40823AD4   MOVEQ      #$00,D1                                 | 7200
     +1C56  40823AD6   MOVE.W     D7,D2                                   | 3407
     +1C58  40823AD8   MOVE.W     (A0),D6                                 | 3C10
     +1C5A  40823ADA   ANDI.W     #$7FFF,D6                               | 0246 7FFF
     +1C5E  40823ADE   ADD.W      D6,D1                                   | D246
     +1C60  40823AE0   ADDQ.W     #$4,A0                                  | 5848
     +1C62  40823AE2   CMP.W      D1,D0                                   | B041
  LOG [pathname | Printer]
     Log all MacsBug output to a file or to an ImageWriter printer.
     LOG without parameters turns logging off.
 Closing log

 *   Fred Dushin
 *   School of Computer and Information Science
 *   2-120 CST
 *   Syracuse University
 *   Syracuse, NY 13244
 *   WWW:



1. Crashing dbl click on PC project

Hi there,

Old Mac Code Warrior user, I installed it on a PC for some X-platform
CW Pro 5.2 did fine, till suddendly double clicking on a project file (to
open it in the editor) now ends up with a:

    "Unhandled exception at: 0xc0000005
    at address: 0x0049142d"

The file is properly displayed in the background, though.
If I use the "Open" file command, the file shows up properly.

I desinstalled, reinstalled, upgraded to 5.3, to no avail.
I suspect an OCX problem. Any hints, anybody? (I have a Pentium II, 96Mb
ram, NT 4, SP3).

2. FS: 1040STf

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