Macro Generation Numbers

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You can use macro generation numbers to avoid the multiple symbol definition that can occur with multiple macro expansions. To avoid this problem, specify a macro generation number marker as part of any symbol used in a macro. This results in symbols that are unique to each macro call.

The macro generation number marker is expanded as a 5-digit decimal number between 00000 and 99999 that is unique to a macro expansion. The syntax for specifying the macro generation number marker is as follows:

\@

Two or more macro generation number markers can be written in a macro body, and they will be expanded to the same number in the same macro call. The following example shows how to specify macro generation numbers for #str and end_str.

    .MACRO  RES STR, Rn
    MOV.L    #str\@,\Rn
    BRA    end_str\@
    NOP
str\@  .SDATA  "\STR"
    .ALIGN 2
end_str\@
    .ENDM
    RES "ONE",R0  ; Different symbols are generated each time
    RES "TWO",R1  ; RES_STR is expanded.

Expanded results are as follows:

    MOV.L    #str00000,R0
    BRA    end_str00000
    NOP
str00000      .SDATA "ONE"
    .ALIGN 2
end_str00000
    MOV.L    #str00001,R1
    BRA    end_str00001
    NOP
str00001      .SDATA "TWO"
    .ALIGN 2
end_str00001

See Also

SHASM Macro Directives | SHASM Macro Definition

 Last updated on Thursday, April 08, 2004

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