Nested macro calls

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Smile

Joined: 07 May 2006
Posts: 6

Smile

Hi

Used compiler fasm-1.64

Code:

macro Parse string
{
 match char tail, string
 \{
  Parse tail ; extra characters on line 'parse+1'
 \}
}

Parse 1+1

What is wrong?

08 May 2006, 21:05

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4633
Location: Argentina

LocoDelAssembly

In FASM 1.66 I get illegal instruction 'Parse+1' and it's OK because there is no previous macro definition named "Parse"

08 May 2006, 21:59

Smile

Joined: 07 May 2006
Posts: 6

Smile

so i can not use recursion at all?

08 May 2006, 22:56

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4633
Location: Argentina

LocoDelAssembly

In that way not, if you call a macro with the same name that the current macro you will call the previous definition.

2.3.3 Macroinstructions wrote:

macro mov op1,op2
{
if op1 in <ds,es,fs,gs,ss> & op2 in <cs,ds,es,fs,gs,ss>
push op2
pop op1
else
mov op1,op2
end if
}

"mov op1, op2" is not a recursive call, it calls the previous definition of that macro and since there is not one the MOV instruction is assembled.

Recursion is posible with some tricks, but, I can't remember...
[edit]Maybe you can get some info in win32ax.inc with the allow_nesting macro[/edit]

08 May 2006, 23:12

dead_body

Joined: 21 Sep 2005
Posts: 187
Location: Ukraine,Kharkov

dead_body

Code:

macro Parse string 
{ 
 match char tail, string 
 \{ 
  ;here you must include macro Parse(it must be in another file)
  Parse tail ; extra characters on line 'parse+1'
  ;here purge it 
 \} 
} 

Parse 1+1

read about this in documentation.

it is one of the way to do recursion.

09 May 2006, 07:21

Tomasz Grysztar
Assembly Artist

Joined: 16 Jun 2003
Posts: 7709
Location: Kraków, Poland

Tomasz Grysztar

See the PARSECOND macro in the MACRO/IF.INC in fasmw package. It does some parsing without recursion, it uses IRPS instead.
As for sample recursion, you can find some in the JNCONDEL and other similar macros in the same file.

09 May 2006, 07:32

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

Code:

macro Define_Parse {
  macro Parse \{  
    Define_Parse
    Parse
  \}
}
Define_Parse

this is the idea

Last edited by vid on 09 May 2006, 12:31; edited 1 time in total

09 May 2006, 09:48

Tomasz Grysztar
Assembly Artist

Joined: 16 Jun 2003
Posts: 7709
Location: Kraków, Poland

Tomasz Grysztar

vid: well said. Smile

09 May 2006, 12:14

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

thanks, anyway it's stolen from your nested call macros Wink

09 May 2006, 12:30

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