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Q76725: FIX: INVOKE May Cause Incorrect Line Information

Article: Q76725
Product(s): Microsoft Macro Assembler
Version(s): MS-DOS:6.0
Operating System(s): 
Keyword(s): 
Last Modified: 04-MAY-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Macro Assembler (MASM), version 6.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

The Microsoft Macro Assembler (MASM) version 6.0 may generate line information
that does not match the assembled code. When the parameters on an INVOKE
statement are listed on more that one source line, line number information after
the INVOKE might not match the assembled code. Incorrect line information will
cause the assembler to show errors on the wrong lines. It also causes the
CodeView debugger to appear to execute blank lines, comments, or wrong lines. In
addition, it can cause problems setting breakpoints in CodeView.

RESOLUTION
==========

To avoid this problem, put all of the parameters of an INVOKE call on the same
line in the source code.

STATUS
======

Microsoft has confirmed this to be a problem in MASM version 6.0. This problem
was corrected in MASM version 6.0a.

MORE INFORMATION
================

When the following sample code is run using CodeView, the debugger will appear
to execute the wrong lines.

Sample Code
-----------

  ; Assemble options needed: /Zi

  .MODEL small, c
  .STACK 4096

  .DATA
  Saaz        DW 1234h, 17h
  Hallertauer DQ 0

  .CODE
  hops PROC far C USES ax si di, boiling:ptr, finishing:ptr
      mov si, boiling
      mov di, finishing
      mov ax, [si]
      mov [di], ax
      mov ax, [si+2]
      mov [di+2], ax
      ret
  hops ENDP

      .startup
      mov ax, ds
      mov es, ax

      INVOKE  hops,
      offset Saaz,
      offset Hallertauer  ;CodeView appears to execute mov ax, Saaz here
                          ;and mov bx, Saaz+2 on this line.
      mov ax, Saaz
      mov bx, Saaz+2
      .exit 0
  END

Additional query words: 6.00 buglist6.00 fixlist6.00a

======================================================================
Keywords          :  
Technology        : kbMASMsearch kbAudDeveloper kbMASM600
Version           : MS-DOS:6.0
Solution Type     : kbfix

=============================================================================

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