Macro repeat problem!

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u111no

Joined: 27 Apr 2007
Posts: 2
Location: Moscow

u111no 27 Apr 2007, 09:03

Hellow!
I'v got a problem with macro write.
To use macro in some programs, I'v made an *.inc file with macro.
Here the cod of the *.inc file with macro (MyMacro.inc):

Code:

   
; The macro multiply M1 to M2 by using the loop cycle

    macro  ProMul M1,M2
   {
    mov dx,0
    mov cx,M1
   Lmul:
   add dx,M2
   Loop Lmul
   }

Here the cod of some short program, that uses my macro:

Code:

   
   include      'MyMacro.inc'
   org    100h
   mov    ah,02h
   ; First ask of my Macro
   ProMul  2,3 ; It's working.
   add     dl,30h
   int     21h
   ; Second ask of my Macro
   ProMul  3,3  ; Error: Symbol already defined -> Lmul
   add     dl,30h
   int     21h
   ; Stop of the program to see the screen
   mov    ah,0h
   int    16h
   ; Out from program
   int    20h

What should I do to make my macro work with Loops (Jumps) more then once in program?
Thanks for your replies.

27 Apr 2007, 09:03

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 27 Apr 2007, 09:39

Code:

 macro  ProMul M1,M2 
   { 
        local ..Lmul   ;<---
        mov dx,0 
        mov cx,M1 
        ..Lmul:        ;<----
        add dx,M2 
        Loop Lmul 
   }

prefixing macro-local name with two dots is good idea, so that it doesn't change current "namespace" label

27 Apr 2007, 09:39

u111no

Joined: 27 Apr 2007
Posts: 2
Location: Moscow

u111no 27 Apr 2007, 09:53

Thank you Vid.
All works!!

P.S. [Loop Lmul] -> [Loop ..Lmul] too

27 Apr 2007, 09:53

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 27 Apr 2007, 09:57

Quote:

Thank you Vid

you're welcome.

by the way, it's "vid", not "Vid" Wink

27 Apr 2007, 09:57

asmfan

Joined: 11 Aug 2006
Posts: 392
Location: Russian

asmfan 27 Apr 2007, 14:57

Let me ask this question, what the reason to write

Code:

local ..Lmul

and not

Code:

local .Lmul

. ..Lmul will have global scope being local label if 2 dots but what for 2 not one?

_________________
Any offers?

27 Apr 2007, 14:57

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 28 Apr 2007, 15:17

there is no resulting difference whether you use two dots or just one, because "local" directive changes the resulting name.

Using two is better for clarity, local labels should be used only for local things

28 Apr 2007, 15:17

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 28 Apr 2007, 15:36

In this scenario (among others), double dotted labels are needed:

Code:

macro block{
local ..end

  macro exit\{jmp ..end\}
  macro end\{..end:\}
} 

block 
  ; some code
  exit ; Works since aLabel doesn't hide double dotted labels
aLabel:
  ; some code
end

28 Apr 2007, 15:36

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