From: Matt Wette <matt.wette@gmail.com>
To: Roel Janssen <roel@gnu.org>
Cc: Guile User <guile-user@gnu.org>, guile-devel <guile-devel@gnu.org>
Subject: Re: ffi-help: status to 19 Aug 2017
Date: Thu, 9 Nov 2017 17:00:23 -0800 [thread overview]
Message-ID: <0B1CB7F6-A400-487D-BBCA-BE08E75033CA@gmail.com> (raw)
In-Reply-To: <878tfffet8.fsf@gnu.org>
> On Nov 9, 2017, at 11:10 AM, Roel Janssen <roel@gnu.org> wrote:
>
>
> Matt Wette writes:
>
>> Hi All,
>>
>> I am working on a ffi-helper: a program that will read in a C dot-h file and generate a Guile dot-scm file
>> which defines a module to provide hooks into the associated C library. Goal is to release something in
>> Oct 2017 but that date is likely to slip.
>>
>> Current shortcomings:
>> 1) Guile does not currently handle some types (e..g, long long, uintptr_t).
>> 2) Guile does not have support for varargs (e.g., printf(char *, ...) ).
>> I may take a look at this. One idea I have is to use '... in the call interface spec
>> and use (type . value) pairs in the calls.
>> 3) The bytestructures module does not support function declarations.
>> 4) ... (probably more)
>>
>> Someone asked to have libgit2 converted and this, and some others, turned out to give visibility
>> to several limitations and bugs in my C parser. For one, how #include <foo/bar.h> is interpreted
>> is not specified by the language: it is implementation defined, and I had to track down how libgit2
>> was including files. I also had to add some GNUC extensions (e.g., asm, statement-block expressions,
>> include_next) to the parser and preprocessor. As one can see from the file listing below, libgit2
>> has a large number of files, and declarations.
>>
>> ...
>
> Thanks for creating this! It seems to be very useful and powerful.
>
> I wanted to try ffi-helper on htslib, but I am confused on how to get
> started. Where does the "compile-ffi" subcommand for "guild" come from?
>
> Kind regards,
> Roel Janssen
See the following, but I'm seeing a parse error so may be a bug in my C99 parser. And not sure "hts.h" is the only include you need.
mwette$ git clone -b c99dev git://git.savannah.nongnu.org/nyacc.git nyacc
Cloning into 'nyacc'...
remote: Counting objects: 5927, done.
mwette$ cd nyacc
mwette$ cd examples
mwette$ source env.sh
mwette$ cd ffi
mwette$ cp TMPL.ffi htslib.ffi
mwette$ vi htslib.ffi
mwette$ cat htslib.ffi
;; htslib.ffi -*- Scheme -*-
(define-ffi-module (ffi htslib)
#:pkg-config "htslib"
#:include '("htslib/hts.h")
#:inc-filter (lambda (file-spec path-spec)
(string-contains path-spec "htslib/" 0))
)
;; --- last line ---
mwette$ guild compile ffi/htslib.fif
;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
;;; or pass the --no-auto-compile argument to disable.
;;; compiling /var/tmp/yy/nyacc/examples/scripts/compile-ffi.scm
...
;;; compiled .../c99/ffi-help.scm.go
TODO: fix gen-lookup-proc: it's including imported symbols
;;; scripts/compile-ffi.scm:119:8: warning: possibly unbound variable `compile'
;;; compiled /Users/mwette/.cache/guile/ccache/2.2-LE-8-3.A/private/var/tmp/yy/nyacc/examples/scripts/compile-ffi.scm.go
ffi-help: WARNING: the FFI helper is experimental
/opt/local/include/htslib/hts.h:774: parse failed at state 313, on input "U"
(unknown):1: C99 parse error
*** compile-ffi: parse failed
The offending line is the following, which seems to indicate my lexer is not reading "LLU" constants. I will check.
v = ((v & 0x00000000FFFFFFFFLLU) << 32) | (v >> 32);
Had the above worked, then you should be able to `(use-modules (ffi htslib))':
mwette$ guile
GNU Guile 2.2.2
Copyright (C) 1995-2017 Free Software Foundation, Inc.
Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.
Enter `,help' for help.
scheme@(guile-user)> (use-modules (ffi htslib))
ERROR: no code for module (ffi htslib)
next prev parent reply other threads:[~2017-11-10 1:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <D30BE676-0171-4E8F-8CD0-B40A74B08850@gmail.com>
2017-08-19 15:30 ` ffi-help: status to 19 Aug 2017 Matt Wette
2017-09-08 3:32 ` ffi-help: #:use-ffi-module Matt Wette
2017-09-08 3:40 ` Matt Wette
2017-11-09 19:10 ` ffi-help: status to 19 Aug 2017 Roel Janssen
2017-11-10 1:00 ` Matt Wette [this message]
2017-11-10 2:34 ` Matt Wette
2017-11-10 2:39 ` Matt Wette
2017-11-10 23:04 ` Stefan Israelsson Tampe
2017-11-11 4:38 ` Matt Wette
2017-11-14 18:06 ` Ricardo Wurmus
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