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Message from discussion Subroutine calls
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Leopold Toetsch  
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 More options Apr 2 2004, 11:00 am
Newsgroups: perl.perl6.internals
From: l...@toetsch.at (Leopold Toetsch)
Date: Fri, 02 Apr 2004 17:25:14 +0200
Local: Fri, Apr 2 2004 10:25 am
Subject: Subroutine calls
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The PIR subroutine call syntax

    _f()

expands (besides other instructions) to something like:

   newsub P0, .Sub, _f
   invokecc

I've now hacked together this sequence:
1) a new opcode (in dynoplibs/myops.ops for quick testing)

op pmc_const(out PMC, inlabelconst INT) {
     $1 = PCONST($2)->u.key;
     goto NEXT();

}

2) The call:
   loadlib P10, "myops_ops"
   pmc_const P0, 3
   ...
   invokecc

(The constant number #3 is known to imcc when generating the const table
entry - actuall it would ne more like  pmc_const P0, _f)

So *if* all is as static as in this code, and the Sub PMC isn't abused
by different callers (e.g. by attaching properties or such), then this
scheme would safe the C<newsub> operation, i.e. the construction of a
new PMC.

Comments welcome,
leo


 
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