Preprocessor for an assembler using m4? (Prakash R.)
31 Jul 1996 19:30:44 -0400

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Preprocessor for an assembler using m4? (1996-07-31)
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From: (Prakash R.)
Newsgroups: comp.compilers
Date: 31 Jul 1996 19:30:44 -0400
Organization: Compilers Central
Keywords: macros, assembler, question

Can I use "m4" as a front end to the assembler that I'm building? I
remember seeing something to this effect in one of the postings. I tried
to check out the documentation available on "m4". Wasn't clear to me if
I could do it & if I could, how?

The assembler preprocessor has the following facilities:
- macro substitution
- file inclusion
- conditional compilation

Can I write a "m4-script" which will take care of all these? I have listed
some examples of the preprocessor facilites required below. If m4 can take
care of the above, then I don't have to write the preprocessor part of
the assembler. Will I be able to tune m4-script to match the syntax of the
assembler I'm developing?

Can I have nested macros? What about nested conditional compilation?
Any examples of how m4 is used on the net? Any references.

Any help would be greatly appreciated.


// Examples

*) macro substitution:
- #define <identifier> <token string>
- #undef <identifier>

eg. #define QUEUE .space 2*10+4
for every occurence of QUEUE in the program text, the line
.space 2*10+4
is substituted.

*) file inclusion:
#include "filename"

*) Conditional assembly:
#ifdef <identifier>
#ifndef <identifier>
#if <absolute expression>

#define DEBUG 1
#ifdef DEBUG
[Should be doable if you have a sufficiently twisted mind to think in M4.
-John, old Trac hacker]


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