FIX: MASM Generates Stack Overflow on Code with Redefinition

• Microsoft Macro Assembler for MS-DOS, versions 5.1, 5.1a
• Microsoft Macro Assembler for OS/2, versions 5.1, 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 query words: 5.10 5.10a buglist5.10 buglist5.10a fixlist6.00

Keywords :
Version : :5.1,5.1a
Platform :
Issue type :