FIX: Incorrect CV Info for Local Structure in MASM 6.0 (79208)


The information in this article applies to:

  • Microsoft Macro Assembler (MASM) 6.0
  • Microsoft Macro Assembler (MASM) 6.0a
  • Microsoft Macro Assembler (MASM) 6.0b
This article was previously published under Q79208

SYMPTOMS

When a program that contains a local structure but no global structures of the same type is assembled with the Microsoft Macro Assembler (MASM), and that variable is watched with the Microsoft CodeView (CV) debugger, CodeView will report that the variable has no type.

CAUSE

The CodeView information generated by MASM for that local structure is not correct.

RESOLUTION

Declare a dummy global structure of the same type.

STATUS

Microsoft has confirmed this to be a problem in MASM versions 6.0, 6.0a, and 6.0b. This problem was corrected in MASM for MS-DOS version 6.1.

MORE INFORMATION

The following sample demonstrates the problem. Bring the .EXE into CodeView and begin stepping through. After stepping into procedure "func", the local window has: 
   <no type> result
To work around the problem, uncomment the global variable "global" and reassemble. After stepping into procedure "func", the local window has: 
   +struct sample result

Sample Code

; Assemble options needed: /Zi

.MODEL small, C

sample STRUC
    x1 DW 1
    x2 DW 2
sample ENDS

.STACK 4096

.DATA
;global sample <>

.CODE
func PROC near
    LOCAL result:sample

    mov result.x1, 0
    mov result.x2, 0
    ret
func ENDP

start:
    .startup
    call func
    .exit 0
END
Modification Type:MajorLast Reviewed:10/20/2003
Keywords:kbfix KB79208
©2003 Microsoft Corporation. All rights reserved.