Hi

I'm meditating about a macrosystem which is working after compilation and before execution

The idea is to flag subs as :macro and and to replace every call with the string the sub returns. 

use B::MyMacro;
sub foo :macro {
  return "bar()"
}

[download]
so that 
 
print;
foo();
print;

[download]
will be replaced with 
print;
do { bar() };
print;

[download]

Of course eval "string" needs also to be overridden, such that the macroreplacement will also be executed after eval's compilation.

This mechanism can already be realised using B::Deparse, RegEx and evals, but with rather fragile dependencies. I'm looking for a stable and simple opcode-based solution, replacing every macro-call with new opcodes.

IMHO, this approach would be much more stable and useful than codefilters, because "only perl can parse perl" ¹.

I'm wondering if nobody ever tried to implement this, googling and supersearching didn't bring any examples. Do you know any other similar approach?

Cheers Rolf

UPDATES:
(¹) ... but "Even B:: can parse optree" : )

In reply to Macro system on B-Level? by LanX

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