Confusion with defining one macro by another (pg 75)

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Eoin

Joined: 16 Jun 2003
Posts: 68
Location: Ireland

Eoin

Hi I'm undoubtly being a bit dense here but I'm trying to do something similar to what pg 75 of the pdf demonstrates...

Quote:

Code:
macro tmacro params
{
    macro params {
}

MACRO fix tmacro
ENDM fix }    
defines an alternative syntax for defining macroinstructions, which looks like:
Code:
MACRO stoschar char
    mov al,char
    stosb
ENDM    

But I want to do this so that I can do some extra things at the beginning and end, as such I really need to be able to use a macro for closing the end of the constructed one. There is something about this at the end of the page but I can't figure it out

Quote:

This might be a problem if one needed to perform some additional tasks
one the end of such definition, but there is one more feature which helps
in such cases. Namely it is possible to put any directive, instruction or
macroinstruction just after the } character that ends the macroinstruction
and it will be processed in the same way as if it was put in the next line.

Could someone show me a small example.... please and thank you.

16 Sep 2005, 23:42

Remy Vincent

Joined: 16 Sep 2005
Posts: 155
Location: France

Remy Vincent

Macro

is a waste of time, is it so hard to copy xx times the two lines... I don't know how Shocked

macro

works & i hope i will never have to learn this "unstick from the Code" way of programming ! Shocked

_________________
Groups lower your IQ

17 Sep 2005, 00:03

Eoin

Joined: 16 Jun 2003
Posts: 68
Location: Ireland

Eoin

Well now, macros aren't all bad. Anyway back on topic I came up with a solution;

Code:

macro tprocMacro mname,[params] {
common
        macro mname,params {
forward
        CheckParam params
common
}

macro tendpMacro {
        ; Do something here too
}

tproc fix tprocMacro
tendp fix tendpMacro }

It is used as following;

Code:

tproc MacroCode param1,param2 
        ; Do stuff 
tendp

Now the remaining problem is that param1 seems to be counted as part of the mname parameter and so only param2 gets passed to the CheckParam macro which is supposed to perform some preprocessing on all the parameters for the macro. I take it the lack of a comma between 'MacroCode param1' is the problem, but putting one there gives an error.

17 Sep 2005, 00:16

Eoin

Joined: 16 Jun 2003
Posts: 68
Location: Ireland

Eoin

This seems a bit hacky, but it does work..

Code:

macro tprocMacro mname,[params] {
common
        match a b,mname \{ 
                macro a b,params {
                CheckParam b 
        \}
forward
        CheckParam params
}

Is there a neater way?

17 Sep 2005, 00:33

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 7861
Location: Kraków, Poland

Tomasz Grysztar

Quote:

Namely it is possible to put any directive, instruction or
macroinstruction just after the } character that ends the macroinstruction

This means that you can do something like:

Code:

tproc fix tprocMacro
tendp fix } tendpMacro

And "tendpMacro" will be evaluated after finishing the definition started with "tprocMacro".

17 Sep 2005, 01:16

Eoin

Joined: 16 Jun 2003
Posts: 68
Location: Ireland

Eoin

Thank you for your reply Thomaz, the tendpMacro actually generates some code which needs to go with each instance of the generated macro as opposed to just with its definition, so the ordering tendp fix tendpMacro } works best in my case.

I am still having trouble processing the parameters though. I can't get a consistent method which will work for 0, 1 or 2+ parameters. The one I am using (above) accepts 2+ parameters only and work work with less.

19 Sep 2005, 01:49

Eoin

Joined: 16 Jun 2003
Posts: 68
Location: Ireland

Eoin

Ok I think I've come up with a clean solution which works for the different cases.

Code:

macro tprocMacro name,[param] {
common
        macro name param {
if ~ param eq
        forward
                ; Parameter processing here
        common
end if
}

macro tendpMacro {
        ; End stuff here
}

tproc fix tprocMacro
tendp fix tendpMacro }

In the end it seems quite simple, but sure thats what yo want.

19 Sep 2005, 14:49

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