FIX: Incorrect RET Generated for PROC when EPILOGUE:NONE (102432)

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
Microsoft Macro Assembler (MASM) 6.1
Microsoft Macro Assembler (MASM) 6.1a

This article was previously published under Q102432

SYMPTOMS

When Microsoft Macro Assembler (MASM) processes source code for an application, it may generate the incorrect form for a RET instruction in a PROC. Specifically, the assembler generates a RET 4 instruction instead of a RET instruction when the source code contains a RET instruction.

CAUSE

The source code uses the OPTION EPILOGUE statement multiple times to set the EPILOGUE macro to NONE.

RESOLUTION

Modify the source code to specify RET 0. The assembler translates this expression into a RET instruction.

STATUS

Microsoft has confirmed this to be a problem in MASM versions 6.0, 6.0a, 6.0b, 6.1, and 6.1a. This problem was corrected in MASM for MS-DOS version 6.11.

MORE INFORMATION

The following code example demonstrates this problem:

Sample Code

; Assembler options needed: /c /Fl /Sa

.MODEL small, Pascal

_text SEGMENT

OPTION EPILOGUE:NONE
p0 PROC parm1:DWORD
    ret                 ; This correctly generates a RET
p0 ENDP

OPTION EPILOGUE:EpilogueDef
p1 PROC parm1:DWORD
    ret                 ; This correctly generates a RET 4
p1 ENDP

OPTION EPILOGUE:NONE
p2 PROC parm1:DWORD
    ret                 ; This incorrectly generates a RET 4
p2 ENDP

_text ENDS

END

Modification Type:	Minor	Last Reviewed:	10/14/2003
Keywords:	kbfix KB102432