FIX: MASM Generates Stack Overflow on Code with Redefinition

 Last reviewed: September 11, 1997
Article ID: Q34930
5.10 5.10a | 5.10 5.10a 
MS-DOS     | OS/2
kbtool kbfixlist kbbuglist

The information in this article applies to:

  • Microsoft Macro Assembler for MS-DOS and OS/2, versions 5.1 and 5.1a

SYMPTOMS

The example code below causes the Microsoft Macro Assembler (MASM) versions 5.10 and 5.10a to generate the error message, 

   run-time error R6000
   - stack overflow

CAUSE

The redefinition of a symbol. It is defined as an equate and as a macro.

RESOLUTION

The workaround is to remove the redefinition of "xx". MASM version 6.0 and later correctly generate errors in this situation 

   A2008: syntax error: macro
   A1008: unmatched macro nesting

STATUS

Microsoft has confirmed this to be a problem with MASM versions 5.10 and 5.10a. This problem was corrected in MASM version 6.00.

MORE INFORMATION

The following sample code demonstrates the problem.

Sample Code

; Assemble options needed: none 

      .model   small
      .code

xx    EQU      <nop>
xx macro 
      NOP
      endm

      xx

      END

Additional reference words: 5.10 5.10a buglist5.10 buglist5.10a fixlist6.00
KBCategory: kbtool kbfixlist kbbuglist
KBSubCategory: MLIss
Solution Type : kbfix

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Last reviewed: September 11, 1997
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.