FIX: DX1020 Using TEXTEQU to Define False IF Block (120154)

SYMPTOMS

Using the TEXTEQU directive to define an IF statement that evaluates to FALSE produces the following error message in MASM version 6.1 or 6.1a:

DOSXNT : fatal error DX1020: unhandled exception: General protection fault

When you use ML from MASM version 6.0b, an "Application Error" message box appears when running from a Windows MS-DOS box. From straight MS-DOS, the following error message occurs:

fatal error A1000: cannot open file : error #xx -
: Macro Called From Main Line Code

Using MLX from MASM version 6.0b produces the following error message:

run-time error R6915
- DOSX16 : unhandled exception

Using ML from MASM version 6.0a, the following error messages occur:

fatal error A2051: text item required
: Macro Called From Main Line Code
fatal error A1010: unmatched block nesting : _text

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The following sample code illustrates the problem:

Sample Code

; Assemble options needed: none

  dbgs textequ <if 0>      ; evaluates to false
  dbgsend textequ <endif>
  dump_matrix macro
    dbgs
    mov ax, ax
    dbgsend
  endm
  _text segment
    dump_matrix
  _text ends
  END

FIX: DX1020 Using TEXTEQU to Define False IF Block (120154)

SYMPTOMS

RESOLUTION

STATUS

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Sample Code