Gambit-list Mai 2009

gambit-list@iro.umontreal.ca

22 participants
44 discussions

Re: [gambit-list] automatic int -> double conversion
by Marc Feeley 20 Mai '09

20 Mai '09

On 19-May-09, at 4:44 PM, lowly coder wrote: > This is a lot of manual wrapping. Can I define a 'type' like a > lenient-double to have this automatically called? (Then I can sed my > *.scm for double -> lenient-double) Yes you can define your own type with converter functions. The hardest thing to implement is the conversion of bignums and exact rationals to double (the exact->inexact function does this in Scheme). Marc

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Converting (unsigned char *) into u8vector?
by Taylor Venable 19 Mai '09

19 Mai '09

I have some binary data which is stored in an (unsigned char *) and I want to convert it into a u8vector. So I tried writing a conversion function like this: ___SCMOBJ BYTEARRAY_to_SCMOBJ (unsigned char *src, ___SCMOBJ *dst, int arg_num) { unsigned char *srcp = src; unsigned int size; int i = 0; bcopy(src, &size, sizeof(unsigned int)); src += sizeof(unsigned int); ___SCMOBJ ___err = ___FIX(___NO_ERR); ___BEGIN_ALLOC_U8VECTOR(size); for (i = 0; i < size; i += 1) { ___SCMOBJ scm_int; ___err = ___EXT(___U8_to_SCMOBJ) (src[i], &scm_int, arg_num); if (___err != ___FIX(___NO_ERR)) return ___FIX(___UNKNOWN_ERR); ___ADD_U8VECTOR_ELEM(i, scm_int); ___EXT(___release_scmobj) (scm_int); } ___END_ALLOC_U8VECTOR(size); dst = ___GET_U8VECTOR(size); return ___FIX(___NO_ERR); } (This function will be used by macros to support c-define-type. I'm storing the size of the array in the first sizeof(int) bytes, like a "Pascal string" does.) By looking through gambit.h I found some macros which seem to apply to making and manipulating u8vectors, such as ___ADD_U8VECTOR_ELEM. However, they use a variable ___hp which isn't defined anywhere. Is this the right API to use for this sort of thing? Or if not hopefully somebody can share an example of this kind of conversion that I can use as a guide. Thanks, -- Taylor Christopher Venable http://real.metasyntax.net:2357/

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automatic int -> double conversion
by lowly coder 19 Mai '09

19 Mai '09

I have a C/ffi function that expects a double as an argument. If I do (foo 0.0) <-- works fine if I do (foo 0) <-- complains about int / double mismatch; which makes sense. Is there a way to automatically have gambit convert ints to doubles? Thanks!

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Scheme Workshop 2009: deadline NOT extended!
by John Clements 18 Mai '09

18 Mai '09

It's now three weeks until the Scheme Workshop deadline. We won't be extending the deadline, but this should still give you plenty of time to put together your magnificent Scheme Workshop paper. Thanks! John Clements *********************************************** SCHEME AND FUNCTIONAL PROGRAMMING WORKSHOP 2009 Cambridge, Massachusetts August 22, 2009 2ND CALL FOR PAPERS http://www.schemeworkshop.org/2009/ *********************************************** The Scheme and Functional Programming Workshop showcases research and experience related to Scheme, and more broadly to all aspects of functional programming. Areas of interest include: * Language Design, Type Systems, Theory * Program Development Environments, Education * Agile Methodologies, Lightweight Software Engineering * Applications, Implementation, and Experience * SRFIs! In addition to technical papers on matters of programming-language research, we encourage submissions that present experience or innovation with a particular project. The key criterion for any paper--technical or not--is that it makes a contribution from which other practitioners can benefit. ** Dates: ** Dates are firm, and will not be extended. Please plan accordingly. Submission Deadline: June 5, 2009 (FIRM) Author Notification: June 26, 2009 Final Papers Due: July 24, 2009 Workshop: August 22, 2009 ** Program Committee: ** John Clements, Cal Poly State University (organizer & chair) Dominique Boucher, Nu Echo Abdulaziz Ghuloum, Indiana University David Herman, Northeastern University Shriram Krishnamurthi, Brown University Matthew Might, University of Utah David Van Horn, Northeastern University ** Publication Policy: ** Submitted papers must have content that has not previously been published in other conferences or refereed venues, and simultaneous submission to other conferences or refereed venues is unacceptable. Publication of a paper at this workshop is not intended to replace conference or journal publication, and does not preclude re-publication of a more complete or finished version of the paper at some later conference or in a journal. ** Submission Instructions: ** Your submissions should be no longer than 12 pages, including bibliography and appendices. Papers may be shorter than this limit, and the Program Committee encourages authors to submit shorter papers where appropriate. The conference web page (URL above) contains detailed formatting instructions and LaTeX support files. Submit your papers using the Continue 2.0 submission server, at the URL: http://continue2.cs.brown.edu/scheme2009/ We look forward to reading your papers! \

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c-define-type pointer
by lowly coder 18 Mai '09

18 Mai '09

Marc, can you explain how pointer, of (c-define-type ... (pointer ...)) fame works? (and also where i can find it's source / reimplement it myself) Thanks!

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more problems with blackhole
by lowly coder 18 Mai '09

18 Mai '09

In the following code, what I'm trying to understand is ... why does the namespace seem to treat functions and macros separately? In particular, there does not seem to be anyway for me to access 'bar' in test2 once I (export) ~/magic$ cat test.scm (define (foo x) (list x x)) (define-macro (bar x) `(list ,x ,x)) ~/magic$ cat test2.scm (export) (define (foo x) (list x x)) (define-macro (bar x) `(list ,x ,x)) ~/magic$ bsc > (import test) > foo #<procedure #2 test#foo> > bar *** ERROR IN ##main -- Macro name can't be used as a variable: bar > *** EOF again to exit ~/magic$ bsc > (import test2) > foo *** ERROR IN (console)(a)2.1 -- Unbound variable: ~#foo 1> bar *** ERROR IN (console)(a)3.1 -- Unbound variable: ~#bar 2> test2#foo #<procedure #2 test2#foo> 2> test2#bar *** ERROR IN (console)(a)5.1 -- Unbound variable: test2#bar 3> 2> 1> > *** EOF again to exit i realize there are workarounds to this ... but

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compilation fun with bsc
by lowly coder 17 Mai '09

17 Mai '09

I realize that for blackhole, c-define-type's are not exported across modules. How do I pull them in? The following code does not compile under bsc (but does under gsc) ~/magic$ cat test3.scm (c-define-type yay int) ~/magic$ bsc test3.scm *** ERROR IN "/home/x/magic/test3.scm"@1.20 -- Undefined C type identifier ~/magic$ gsc test3.scm test3.c:35: warning: deprecated conversion from string constant to ‘char*’ test3.c:89: warning: deprecated conversion from string constant to ‘char*’ I grepped bh/modules for examples of how to use c-define-type, but the only one there used (void). Thanks!

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Re: [gambit-list] Static GSI
by Kirill Lisovsky 16 Mai '09

16 Mai '09

Brad, thanks a lot - that's exactly what I was looking for! Best regards. Kirill. --- On Sat, 5/16/09, Bradley Lucier <lucier(a)math.purdue.edu> wrote: From: Bradley Lucier <lucier(a)math.purdue.edu> Subject: Re: [gambit-list] Static GSI To: "Kirill Lisovsky" <k_lisovsky(a)yahoo.com> Cc: "Bradley Lucier" <lucier(a)math.purdue.edu>, gambit-list(a)iro.umontreal.ca Received: Saturday, May 16, 2009, 9:37 AM On May 16, 2009, at 10:18 AM, Kirill Lisovsky wrote: > > The problem is that such an executable may be incompatible with some > another Linux - if it has some older version of libc, for example. > > I've tried explicit --disable-shared just in case, but it does not make gsi > static... Ah, configure with ./configure CC='gcc -static' --other-configuration-options Brad __________________________________________________________________ Make your browsing faster, safer, and easier with the new Internet Explorer® 8. Optimized for Yahoo! Get it Now for Free! at http://downloads.yahoo.com/ca/internetexplorer/

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Re: [gambit-list] Static GSI
by Kirill Lisovsky 16 Mai '09

16 Mai '09

That's what file and ldd report on gsi compiled on Ubuntu Linux (no static/dynamic related options supplied to configure): file gsi gsi: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.8, dynamically linked (uses shared libs), not stripped ldd gsi linux-gate.so.1 => (0xb7f9e000) libutil.so.1 => /lib/tls/i686/cmov/libutil.so.1 (0xb7f88000) libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb7f84000) libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb7f5e000) libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7e0f000) /lib/ld-linux.so.2 (0xb7f9f000) The problem is that such an executable may be incompatible with some another Linux - if it has some older version of libc, for example. I've tried explicit --disable-shared just in case, but it does not make gsi static... Best regards, Kirill. --- On Fri, 5/15/09, Bradley Lucier <lucier(a)math.purdue.edu> wrote: From: Bradley Lucier <lucier(a)math.purdue.edu> Subject: Re: [gambit-list] Static GSI To: "Kirill Lisovsky" <k_lisovsky(a)yahoo.com> Cc: "Bradley Lucier" <lucier(a)math.purdue.edu>, gambit-list(a)iro.umontreal.ca Received: Friday, May 15, 2009, 11:02 PM On May 15, 2009, at 11:37 PM, Kirill Lisovsky wrote: I'd like to compile Gambit interpreter as a static executable. I think by default it's static (unless you configure with --enable-shaared). Brad __________________________________________________________________ Make your browsing faster, safer, and easier with the new Internet Explorer® 8. Optimized for Yahoo! Get it Now for Free! at http://downloads.yahoo.com/ca/internetexplorer/

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Static GSI
by Kirill Lisovsky 16 Mai '09

16 Mai '09

Hello, I'd like to compile Gambit interpreter as a static executable. I've done that in the past with Gambit 3, but is it possible to do so with modern Gambit? Best regards, Kirill, __________________________________________________________________ Looking for the perfect gift? Give the gift of Flickr! http://www.flickr.com/gift/

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Gambit-list Mai 2009