《Intel汇编第5版》 条件汇编伪指令

一、条件汇编伪指令和宏使用可以使汇编程序更加灵活

　　

二、通过伪指令来检查函数的参数是否为空，如果为空则输出警告信息

　　

INCLUDE Irvine32.inc
includelib Irvine32.lib
includelib kernel32.lib
includelib user32.lib

.data

source    BYTE    "this is source string",

.code
mWriteStr MACRO    string

    IFB <string>

        ECHO --------------------------------------
        ECHO * ERROR parameter missing in mWriteStr
        ECHO * no code generated
        ECHO --------------------------------------
        EXITM
    ENDIF

    push edx
    mov edx,offset string
    call WriteString
    pop edx
endm

main PROC
    ;mWriteStr source
    mWriteStr
    exit
main ENDP
END main

编译上面的程序时会输出警告信息：

C:\RadASM\Masm32\Bin\ML.EXE /c /coff /Cp /nologo /I"C:\RadASM\Masm32\Include" "MacroTest.asm"
 Assembling: MacroTest.asm
--------------------------------------
* ERROR parameter missing in mWriteStr
* no code generated
--------------------------------------
C:\RadASM\Masm32\Bin\LINK.EXE /SUBSYSTEM:CONSOLE /RELEASE /VERSION:. /LIBPATH:"C:\RadASM\Masm32\Lib" /OUT:"MacroTest.exe" "MacroTest.obj"
Microsoft (R) Incremental Linker Version ..
Copyright (C) Microsoft Corp -. All rights reserved.

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