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Re: rtl metadata musings
From: |
Andy Wingo |
Subject: |
Re: rtl metadata musings |
Date: |
Sun, 12 May 2013 23:20:33 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux) |
On Sat 11 May 2013 06:48, Mark H Weaver <address@hidden> writes:
> I have only one comment for now, which regards arity information. The
> required/optional/rest representation is not sufficiently general. Not
> only is it unable to handle empty case-lambdas, but it's also unable to
> properly represent a case-lambda that can accept 1 or 3 arguments, but
> not 2.
I did think about this and I think I just didn't express myself well. I
said:
struct guile_arity {
Elf_Addr pc;
Elf_Off size;
nreq; // encodings for these not determined yet
nopt;
flags; // has-keyword-args, has-rest, is-case-lambda
Elf_Offset offset;
}
An entry describes how many required, optional, keyword, and rest
arguments a function has. The .guile.arities section is prefixed by a
length indicating how many entries there are, then all the arity
structures, sorted by pc. Note that one arity may contain another! In
particular for case-lambda clauses you can have one arity for the whole
function, then a number of other ones for the cases.
The case-lambda as a whole would get the is-case-lambda flag. The
arities of the clauses would follow and have their [pc*, pc*+size*]
within the [pc, pc+size] of the case-lambda entry.
I don't know whether to use the nreq/nopt/flags of the "outer" arity for
any purpose or not.
Cheers,
Andy
--
http://wingolog.org/
- rtl metadata musings, Andy Wingo, 2013/05/10
- Re: rtl metadata musings, Mark H Weaver, 2013/05/11
- Re: rtl metadata musings,
Andy Wingo <=
- Re: rtl metadata musings, Andy Wingo, 2013/05/16
- Re: rtl metadata musings, Ludovic Courtès, 2013/05/19
- Re: rtl metadata musings, Andy Wingo, 2013/05/20
- Re: rtl metadata musings, Ludovic Courtès, 2013/05/20
- Re: rtl metadata musings, Mike Gran, 2013/05/20
- Re: rtl metadata musings, Andy Wingo, 2013/05/20
- Re: rtl metadata musings, Ludovic Courtès, 2013/05/20
- Re: rtl metadata musings, Andy Wingo, 2013/05/20