Author Topic: If Structure Member in Control-Flow Directive bug  (Read 5015 times)

ragdog

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If Structure Member in Control-Flow Directive bug
« on: November 01, 2013, 05:40:39 AM »
Hi


Is the error allready present in the Masm32 v10 or v11?

Quote
DOCUMENT:Q74666  06-MAY-2001  [masm]
TITLE   :BUG: A2154 If Structure Member in Control-Flow Directive
PRODUCT :Microsoft Macro Assembler
PROD/VER:MS-DOS:6.0,6.0a,6.0b,6.1,6.10a,6.11
OPER/SYS:
KEYWORDS:

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

 - Microsoft Macro Assembler (MASM), versions 6.0, 6.0a, 6.0b, 6.1, 6.10a, 6.11
-------------------------------------------------------------------------------

SYMPTOMS
========

The Microsoft Macro Assembler (MASM) versions 6.0 and later provide several
Control-Flow directives such as the .WHILE, .REPEAT, and .IF constructs. When
structure members are accessed inside of these constructs, MASM may incorrectly
generate the following error:

   error A2154: syntax error on control-flow directive

RESOLUTION
==========

The sample program below illustrates this problem. As a workaround, a register
or a temporary variable may be used to hold the structure member, as
demonstrated below in Sample Code 2.

STATUS
======

Microsoft has confirmed this to be a problem in MASM versions 6.0, 6.0a, 6.0b,
6.1, 6.1a, and 6.11. We are researching this problem and will post new
information here in the Microsoft Knowledge Base as it becomes available.

Sample Code 1
-------------

   ; Assemble options needed: none

   .MODEL small, C

   STRUCT1 STRUCT
   SMember SWORD 0
   STRUCT1 ENDS

   .STACK 4096

   .DATA
   var1 STRUCT1 <0>

   .CODE
      .startup
      mov bx, OFFSET var1

      .WHILE ((STRUCT1 PTR [bx]).SMember != 1000)
      inc (STRUCT1 PTR [bx]).SMember
      .ENDW

      .REPEAT
      dec (STRUCT1 PTR [bx]).SMember
      .UNTIL ((STRUCT1 PTR [bx]).SMember == 0)

      .IF ((STRUCT1 PTR [bx]).SMember == 0)
      nop
      .ENDIF

      .exit 0
   END

Sample Code 2
-------------

   ; Assemble options needed: none

   .MODEL small, C

   STRUCT1 STRUCT
   SMember SWORD 0
   STRUCT1 ENDS

   .STACK 4096

   .DATA
   var1 STRUCT1 <0>

   .CODE
      .statup
      mov bx, OFFSET var1.SMember

      .WHILE (SWORD PTR [bx] != 1000)
      inc SWORD PTR [bx]
      .ENDW

      .REPEAT
      dec SWORD PTR [bx]
      .UNTIL (SWORD PTR [bx] == 0)

      .IF (SWORD PTR [bx] == 0)
      nop
      .ENDIF

      .exit 0
   END

Additional query words: 6.00 6.00a 6.00b 6.10 6.10a buglist6.00a buglist6.00b buglist6.10 buglist6.10a buglist6.11

======================================================================
Keywords          : 
Technology        : kbMASMsearch kbAudDeveloper kbMASM600 kbMASM610 kbMASM611 kbMASM600a kbMASM600b
Version           : MS-DOS:6.0,6.0a,6.0b,6.1,6.10a,6.11

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

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.

Copyright Microsoft Corporation 2001.

Gives a masm version where the bug is fixed?

Greets,

jj2007

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Re: If Structure Member in Control-Flow Directive bug
« Reply #1 on: November 01, 2013, 08:21:26 AM »
The error is present in all versions but the workaround is easy. Too many brackets, that's all...

Code: [Select]
.MODEL small, C

STRUCT1 STRUCT
SMember SWORD 0
STRUCT1 ENDS

.STACK 4096

.DATA
var1 STRUCT1 <0>

.CODE
.startup
mov bx, OFFSET var1

.WHILE [bx.STRUCT1].SMember != 1000
inc [bx.STRUCT1].SMember
.ENDW

.REPEAT
dec [bx.STRUCT1].SMember
.UNTIL [bx.STRUCT1].SMember == 0

.IF [bx.STRUCT1].SMember == 0
nop
.ENDIF

.exit 0
END

ragdog

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Re: If Structure Member in Control-Flow Directive bug
« Reply #2 on: November 02, 2013, 03:22:23 AM »
Thanks Jochen

there are still more known bugs?

dedndave

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Re: If Structure Member in Control-Flow Directive bug
« Reply #3 on: November 02, 2013, 03:59:29 AM »
i seem to recall the old forum had a list of known masm bugs

qWord

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Re: If Structure Member in Control-Flow Directive bug
« Reply #4 on: November 02, 2013, 04:10:09 AM »
there are still more known bugs?
some bugs are listed in JWasm's help file: "7. Masm bugs fixed in JWasm".
MREAL macros - when you need floating point arithmetic while assembling!