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Re: [Chicken-users] valgrind - more details
From: |
Peter Bex |
Subject: |
Re: [Chicken-users] valgrind - more details |
Date: |
Thu, 6 Oct 2011 12:57:35 +0200 |
User-agent: |
Mutt/1.4.2.3i |
On Thu, Oct 06, 2011 at 12:47:25PM +0200, Jörg F. Wittenberger wrote:
> On Oct 5 2011, Christian Kellermann wrote:
> Today I re-read the R5RS, which left me wondering. Would it be
> #bi101010.1 or whould it be #b#i101010.1 ?
The latter. See the Lexical Syntax section, it has these productions:
<prefix R> -> <radix R> <exactness> | <exactness> <radix R>
<exactness> -> <empty> | #e | #i
<radix 2> -> #b
<radix 8> -> #o
<radix 10> -> <empty> | #d
<radix 16> -> #x
> Furthermore:
> Also I changed my mind: I'm afraid numbers in Scheme are complex
> enough to use a real parser to read them.
I agree. There's pure Scheme code for parsing numbers syntax in trunk
of the numbers egg (and the latest release has it too). It's not very
simple either, but it doesn't have any dependencies.
When I posted my patches to fix some of the more esoteric syntax details
in Chicken, I initially also tried my Scheme code, but it is about twice
as slow as this C code, that's why I decided against switching.
Also, this code needs to be callable from C because decode_literal()
relies on it. (but that could maybe be worked around)
> However let me reiterate: it does not fix valgrind's compaint.
I think the patch is a good improvement in readability of the core code,
so why not put it in? (of course after fixing the while/if mistake)
Cheers,
Peter
--
http://sjamaan.ath.cx
--
"The process of preparing programs for a digital computer
is especially attractive, not only because it can be economically
and scientifically rewarding, but also because it can be an aesthetic
experience much like composing poetry or music."
-- Donald Knuth
- [Chicken-users] Question again on heap mutation from signal handlers., Jörg F . Wittenberger, 2011/10/02
- Re: [Chicken-users] Question again on heap mutation from signal handlers., Jörg F . Wittenberger, 2011/10/02
- [Chicken-users] valgrind - more details, Jörg F . Wittenberger, 2011/10/05
- Re: [Chicken-users] valgrind - more details, Jörg F . Wittenberger, 2011/10/05
- Re: [Chicken-users] valgrind - more details, Jörg F . Wittenberger, 2011/10/05
- Re: [Chicken-users] valgrind - more details, Christian Kellermann, 2011/10/05
- Re: [Chicken-users] valgrind - more details, Jörg F . Wittenberger, 2011/10/06
- Re: [Chicken-users] valgrind - more details,
Peter Bex <=
- Re: [Chicken-users] valgrind - more details, Jörg F . Wittenberger, 2011/10/06
- [Chicken-users] news from the valgrind front, Jörg F . Wittenberger, 2011/10/07
- [Chicken-users] more: news from the valgrind front - another test case, Jörg F . Wittenberger, 2011/10/07
- Re: [Chicken-users] more: news from the valgrind front - another test case, Alan Post, 2011/10/07
- Re: [Chicken-users] more: news from the valgrind front - another test case, Jörg F . Wittenberger, 2011/10/07
- Re: [Chicken-users] more: news from the valgrind front - another test case, Alan Post, 2011/10/07
- Re: [Chicken-users] more: news from the valgrind front - another test case, Jörg F . Wittenberger, 2011/10/08
- Re: [Chicken-users] more: news from the valgrind front - another test case, Alan Post, 2011/10/08
- Re: [Chicken-users] more: news from the valgrind front - another test case, Jörg F . Wittenberger, 2011/10/08
- [Chicken-users] another news from the valgrind front, Jörg F . Wittenberger, 2011/10/11