Help with macro (Reusing macro parameters as "prefix&am

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alorent

Joined: 05 Dec 2005
Posts: 221

alorent 15 Oct 2010, 11:34

Hi guys,

I'd like to implement a macro "c_instance". Example:

Code:

c_instance MyVar, TypeStructVar

and it should generate the following code:

Code:

MyVar <TypeStructVar>
_call TypeStructVar_Init, MyVar

As you can see, we have used a macro argument as part of a name (TypeStructVar -> TypeStructVar_Init)

Is that possible to do with macros?

In a similar way, I'd like to implement also this macro. Example:

Code:

mcall  MyVar.Function1, param1, param2, param3...

and it generates the following code:

Code:

_call  MyVar.Function1, MyVar, param1, param2, param3, ...

In the above "mcall" macro we are extracting "MyVar"...not sure if that's possible to do in FASM macros...

Thanks!

Last edited by alorent on 15 Oct 2010, 11:50; edited 1 time in total

15 Oct 2010, 11:34

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system

revolution 15 Oct 2010, 11:37

Is this for a COM interface?

It looks similar to the macros in COM32.INC (in the Windows download)

15 Oct 2010, 11:37

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 15 Oct 2010, 11:50

Hi revolution,

Well, I'm trying to implement a light "OO" interface. Didn't know there was something similar in COM32.INC.

Anyway, I can see such functionality in COM32.INC Sad

Any help?

Thanks!

15 Oct 2010, 11:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system

revolution 15 Oct 2010, 12:04

Wel the first one looks easy:

Code:

macro c_instance name, type {
      name <type>
   _call type#_Init,name
}

c_instance MyVar, TypeStructVar

The second one looks not so easy. The preprocessor does not support substrings.

15 Oct 2010, 12:04

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 15 Oct 2010, 14:26

Thanks a lot revolution!

As you can see, the second macro has a dot "." that separates the substring that we need (i.e., "MyVar.Function1"). Does that dot help?

Thanks again!

15 Oct 2010, 14:26

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 15 Oct 2010, 14:46

I'd suggest changing macro syntax to something like:

Code:

mcall MyVar, method, arg1, arg2, ...

That way things will get much simpler.

Or, at least use some other character which is not part of symbol name. Something like "MyVar:method". That way you can separate two symbols from single macro argument by using "match" directive.

15 Oct 2010, 14:46

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 15 Oct 2010, 15:10

Hi vid,

Thanks for the information. Yes, I also afraid the "dot" might lead into troubles. I also like your ":" solution. I'm trying to define as something like:

Code:

macro mcall instance_method, [params]
{
   match instance:method, instance_method
   \{
    _call instance\#.method\#, params \} }

but I get error when I call the macro:

Code:

mcall MyInstance:MyMethod, eax, ebx

It says "undefined symbol "MyInstance.method"

Any help?

Thanks!

15 Oct 2010, 15:10

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8353
Location: Kraków, Poland

Tomasz Grysztar 15 Oct 2010, 15:52

It should be:

Code:

_call instance\#.\#method, params

15 Oct 2010, 15:52

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 15 Oct 2010, 17:08

Thanks Tomasz!

That worked as expected! Very Happy

15 Oct 2010, 17:08

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