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Index > Macroinstructions > Macro instruction define

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rydemstorm



Joined: 31 Oct 2012
Posts: 15
rydemstorm
Its possible in FASM doit something like that:
define IsAcc(reg) = reg in <al, ax, eax>
And later use:
macro ejemplo arg
{
if IsAcc(arg)
;something
else
;something
end if
}
Post 07 Nov 2012, 18:49
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yoshimitsu



Joined: 07 Jul 2011
Posts: 96
yoshimitsu
You'd need to define IsAcc as a macro (as macros already are like C's defines with way more facilities), but FASM's macros can't return a value like MASM's can. They're also no simple textual substitution that can occur anywhere in the source like in C, they have to be invoked properly, so sth like "if IsAcc" is not possible.

What I did with TASM's macros back then was passing a local symbolic constant (equ) as a 'pointer' to the sub-macro. TASM handled those differently than FASM. With FASM, however, there is the preprocessing stage and the assembly stage. "if xx in <xx, xy>" is assembly stage, so equ (which is preprocessor stage) wouldn't work with it. But you can use constants ('=' instead of 'equ') which are assembly stage, like:

Code:
macro IsAcc reg,ret
 {
   if reg in <al,ax,eax>
    ret = 1
   else
    ret = 0
   end if
 }

macro test arg
 {
   local ret
   IsAcc arg,ret
   if ret
    display 'alright'
   else
    display 'nope'
   end if
 }    
Post 07 Nov 2012, 22:37
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rydemstorm



Joined: 31 Oct 2012
Posts: 15
rydemstorm
I use something like that to solve the problem:
http://board.flatassembler.net/topic.php?t=14750
Post 07 Nov 2012, 23:17
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