cffi-devel

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1113 discussions

[cffi-devel] Unloading a library
by Justin Heyes-Jones 25 Jan '06

25 Jan '06

I saw some discussion in the archives about extending the library loading functionality. There's a couple of things I'd like that I didn't see, and this may be an oversight on my part... 1) CFFI keep track of which foreign modules it had loaded and allow you to iterate through them 2) Have CFFI allow you to unload a foriegn library by name, which should fail if it is not loaded, otherwise return true. I'd find this handy both for debugging and for cleaning up while a program runs.

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[cffi-devel] New patches: 24-Jan-2006
by loliveira＠common-lisp.net 25 Jan '06

25 Jan '06

Tue Jan 24 18:42:15 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * more doc changes; renamed features - change "docs" to be the default target in doc/Makefile. - add Stephen the list of authors in cffi-manual - rename "Index" to "Comprehensive Index" so that Index.html doesn't clash with index.html on OSX. - add varargs example for defcfun - rename features (again) foreign-funcall -> no-foreign-funcall, long-long -> no-long-long. M ./doc/Makefile -4 +4 M ./doc/cffi-manual.texinfo -65 +21 M ./src/cffi-allegro.lisp -2 +2 M ./src/cffi-clisp.lisp -2 +2 M ./src/cffi-cmucl.lisp -4 +1 M ./src/cffi-corman.lisp -2 +3 M ./src/cffi-ecl.lisp -2 +2 M ./src/cffi-lispworks.lisp -2 +2 M ./src/cffi-openmcl.lisp -4 +1 M ./src/cffi-sbcl.lisp -4 +1 M ./src/features.lisp -2 +3 M ./src/types.lisp -4 +4 M ./tests/callbacks.lisp -5 +5 M ./tests/defcfun.lisp -1 +1 M ./tests/foreign-globals.lisp -3 +3 M ./tests/funcall.lisp -3 +3 M ./tests/misc-types.lisp -4 +4 M ./tests/struct.lisp -1 +1 Tue Jan 24 10:55:02 CST 2006 Stephen Compall <scompall(a)nocandysw.com> * stabilize the last few doc changes - display Luis's name with an accent - @sc the warranty - remove @code from section headings and @seealso - reword no-long-long note again - hey, define-foreign-library supports multiple libraries - clarify what *darwin-framework-directories* is actually used for - reorganize *foreign-library-directories* description - in gendocs.sh, fix libtool links as well M ./doc/cffi-manual.texinfo -94 +100 M ./doc/gendocs.sh -3 +19 Mon Jan 23 10:55:41 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * documentation changes - removed known issue about modern mode as it should work now. - removed note about callbacks being linux/x86 only. - fixed typo: supported -> unsupported. - remove note about [u]int{8,16,32,64} not being implemented. - add documentation about uint, uchar, ulong, ullong. - fix foreign-alloc's function signature. - update info regarding lispworks's new foreign-funcall. - add example for *darwin-framework-directories*. - fixed define-foreign-library's syntax. - comment out sentence about use-foreign-library setting the current foreign library as it doesn't do that yet. - remove the (setf (callback ...)) example. this isn't allowed anymore. - rename foreign-funcall and long-long to no-foreign-funcall and no-long-long. - long-long is a standard C99 type, remove mention of GNU there. - removed TODO item: there's already a tutorial. - added TODO item: document defcfun's new capabilities M ./TODO -2 +1 M ./doc/cffi-manual.texinfo -300 +257 Sun Jan 22 22:06:05 CST 2006 Stephen Compall <scompall(a)nocandysw.com> * document new library interface, some other manual stuff - New macro @Variable. - Fix 2 @end examples. - In "Arguments and Values" headings, use @var for tables of variables, as they act as metasyntactic variables in this situation. - Document new library interface. - Use @unnumberedsec in dictionary nodes instead of @heading, and @code the names. - Platform-specific features: new appendix. - define-curl-option-setter: curl-code is not a keyword - Use new @seealso macro for "See Also" xrefs. - Merge all indexes into cp. M ./doc/cffi-manual.texinfo -215 +730 Thu Jan 19 12:59:20 CST 2006 Stephen Compall <scompall(a)nocandysw.com> * update manual Introduction and Foreign types, texinfo idioms throughout - Remove note on cffi-luis branch. - Write introductory chapter. - Acronym/sc-ify CL implementation names. - Use @cffi{} instead of CFFI. - Use @impnote for notes from luis and james. - Split existing type translator explanation to make "Defining typedefs" and rewrite the former. - Invent an example for defcstruct, and explain its limitations. - Write "Allocating Foreign Objects". - Move with-foreign-object(s) to Pointers chapter, to group it with foreign-alloc. - Use @sc and @result to make REPL examples pretty, and move them into @example sections. - Remove commented-out sections; they can be readded later from darcs repo if need be. M ./doc/cffi-manual.texinfo -442 +544 An updated tarball of CFFI's source can be downloaded here: http://common-lisp.net/project/cffi/tarballs/cffi-060124.tar.gz Darcsweb URL: http://common-lisp.net/cgi-bin/darcsweb/darcsweb.cgi?r=cffi;a=summary

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Re: [cffi-devel] defenum proposal
by Justin Heyes-Jones 24 Jan '06

24 Jan '06

This may be a repost as I got a bounce... The problem I am looking at is that SDL uses un-named enums quite a lot. In addition it does arithmetic on them to create other enums... enum { a_value, another_value, } then it does #define MAKE_MASK (n) (1<<n) enum { MAKE_MASK(a_value), MAKE_MASK(another_value) } In order to do this I can define a lisp function in my swig interface which does the same thing, but for that to work you need someway of getting to the value of the first enums. Justin

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[cffi-devel] defenum proposal
by Frank Buss 24 Jan '06

24 Jan '06

When translating anonymous enums to Lisp, it might be easier to use something like the defcenum: (defmacro defenum (&body enums) `(progn ,@(loop for value in enums for index = 0 then (1+ index) when (listp value) do (setf index (second value) value (first value)) collect `(defconstant ,value ,index)))) This will be expanded to a block of defconstants: (defenum a (b 10) c) -> (PROGN (DEFCONSTANT A 0) (DEFCONSTANT B 10) (DEFCONSTANT C 11)) It is not necessary to use keywords like for the named enums, because unnamed enums in C are just syntatic sugar for a list of "#define"s, which is mapped to a list of defconstants. I don't know, if this macro fits in the philosophy of CFFI, perhaps in some utility class, and maybe with another name "defanonenum". -- Frank Buss, fb(a)frank-buss.de http://www.frank-buss.de, http://www.it4-systems.de

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AW: [cffi-devel] defenum proposal
by Hoehle, Joerg-Cyril 24 Jan '06

24 Jan '06

Luís Oliveira wrote: >I suppose defcenum shouldn't force the user to use keywords though? Certainly not! Where would you get their value from if they are interned into the keyword package. BTW, I think a SWITCH macro would be a useful companion to ENUM. It's CASE where you can put such things into the selector clauses. Instead of (case event-type (#.SDL-keyboard-event[-enum] (do-this)) ... ... or (cond ((if (eql event-type SDL-keyboard-event[-enum]) ... ((if ... or (cond ((if (enum-eq? event-type SDL-keyboard-event) ...) ... BTW, I hate enums in Lisp and the explosion of constants etc. that they cause. I'm not convinced DEFCONSTANT is appropriate. Maybe all is needed is a mapping from name to values (and vice-versa, the CLISP FFI has it), and nice useable forms like the above SWITCH to hide ugliness. BTW, DEFCONSTANT won't help with types like (:array :character MAX_PATH) which once again, shows that it's not a good translation of C. It's just widespread. (:array :character #.MAX_PATH) is also ugly, but I've never thought about finding something better. FWIW, remember to wrap such uses of defconstant into EVAL-when also compile. Regards, Jörg Höhle

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Re: [cffi-devel] Re: defenum proposal
by Hoehle, Joerg-Cyril 23 Jan '06

23 Jan '06

Luis Oliveira writes: >With FOREIGN-ENUM-VALUE, see >http://common-lisp.net/project/cffi/manual/html_node/foreign_002denum_002dv… >Right, that's what CFFI has, see >http://common-lisp.net/project/cffi/manual/html_node/defcenum.html Thanks for pointing me to the CFFI enum stuff. I forgot that the converters already convert to a symbol, so indeed, the SWITCH is superfluous. BTW, w.r.t. to the CFFI enum API, it's ok to use keywords, not other symbols, since the functions all take a "context" parameter, i.e. the enum type. So the keyword is always relative to the type. The manual does not say what happens a) when multiple enum identifier want to map to the same int. b) how foreign-enum-keyword behaves in this case. I've come across a few .h files which had that, can't remember where. >(case (sdl:get-event-type ...) ; or whatever > (:keyboard ...) > (:mouse ...)) Very, very nice! The best I've encountered. Regards, Jörg Höhle.

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[cffi-devel] [patch] lots of new manual changes
by Stephen Compall 23 Jan '06

23 Jan '06

Most notably, documenting the library interface. Thanks especially to Jonathan `slyphon' Simms on #lisp for pointing out a bug in the tutorial code. I added two more broken cross-references, one to libtool, and one to asdf. I'll fix gendocs.sh for libtool later, but would appreciate suggestions (other than host an asdf manual myself) for asdf. Details follow; patch (140k) at http://csserver.evansville.edu/~sc87/cffi/cffi-manual-2s11.darcs.patch Thu Jan 19 12:59:20 CST 2006 Stephen Compall <scompall(a)nocandysw.com> * update manual Introduction and Foreign types, texinfo idioms throughout - Remove note on cffi-luis branch. - Write introductory chapter. - Acronym/sc-ify CL implementation names. - Use @cffi{} instead of CFFI. - Use @impnote for notes from luis and james. - Split existing type translator explanation to make "Defining typedefs" and rewrite the former. - Invent an example for defcstruct, and explain its limitations. - Write "Allocating Foreign Objects". - Move with-foreign-object(s) to Pointers chapter, to group it with foreign-alloc. - Use @sc and @result to make REPL examples pretty, and move them into @example sections. - Remove commented-out sections; they can be readded later from darcs repo if need be. Sun Jan 22 22:06:05 CST 2006 Stephen Compall <scompall(a)nocandysw.com> * document new library interface, some other manual stuff - New macro @Variable. - Fix 2 @end examples. - In "Arguments and Values" headings, use @var for tables of variables, as they act as metasyntactic variables in this situation. - Document new library interface. - Use @unnumberedsec in dictionary nodes instead of @heading, and @code the names. - Platform-specific features: new appendix. - define-curl-option-setter: curl-code is not a keyword - Use new @seealso macro for "See Also" xrefs. - Merge all indexes into cp. -- Stephen Compall http://scompall.nocandysw.com/blog

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[cffi-devel] Auto-nag: cffi link verifier failed
by root＠common-lisp.net 23 Jan '06

23 Jan '06

You are being nagged on because your project's name showed up in the nightly Checkbot run. Checkbot checks for broken links etc. This probably means that you are either pointing to a broken link or that someone is pointing to a broken link on your site. Or something else, it check's a bunch of stuff. Update your webpages or you shall be nagged again next week. To find out what's wrong with your webpages, please consult: http://common-lisp.net/checkbot/checkbot-common-lisp.net.html Any questions? You can reach the author of this cronjob at clo-devel(a)common-lisp.net Thanks!

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[cffi-devel] New patches: 20-Jan-2006
by loliveira＠common-lisp.net 21 Jan '06

21 Jan '06

Fri Jan 20 21:47:20 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * New TODO items. - Underspecifed Semantics: doubles/floats - Known Issues: cffi-tests.asd's bogus :c-test-lib M ./TODO +6 Fri Jan 20 21:38:19 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * Fix foreign-funcall sprintf tests' return types. M ./tests/funcall.lisp -8 +8 Fri Jan 20 21:37:36 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * Do argument promotion on variadic functions - New macro foreign-funcall-varargs that does argument promotion. - Make defcfun use this when &rest is used. - New tests: DEFCFUN.VARARGS.{CHAR,SHORT,INT,LONG,FLOAT,DOUBLE,STRING}. M ./src/functions.lisp -5 +41 M ./tests/defcfun.lisp +49 Fri Jan 20 21:23:50 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * Fix override in clisp's %foreign-type-alignment M ./src/cffi-clisp.lisp -1 +1 Fri Jan 20 21:23:36 CST 2006 Joerg-Cyril Hoehle <hoehle(a)users.sourceforge.net> * %foreign-funcall-pointer/clisp: constant fold with load-time-value M ./src/cffi-clisp.lisp -5 +7 Fri Jan 20 21:22:49 CST 2006 Joerg-Cyril Hoehle <hoehle(a)users.sourceforge.net> * register-callback clisp: use only ffi:exported functions M ./src/cffi-clisp.lisp -9 +7 Mon Jan 16 08:38:20 CST 2006 Joerg-Cyril Hoehle <hoehle(a)users.sourceforge.net> * "added one declare ignore" M ./src/early-types.lisp +1 Fri Jan 20 21:07:13 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * Signal an error when defcstruct/defcunion is passed a :void M ./src/types.lisp +4 Fri Jan 20 20:55:57 CST 2006 Luis Oliveira <loliveira(a)common-lisp.net> * Fix bug in Lispworks's %%foreign-funcall M ./src/cffi-lispworks.lisp -8 +11 An updated tarball of CFFI's source can be downloaded here: http://common-lisp.net/project/cffi/tarballs/cffi-060120.tar.gz Darcsweb URL: http://common-lisp.net/cgi-bin/darcsweb/darcsweb.cgi?r=cffi;a=summary

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Re: [cffi-devel] Callback Fix Branch
by Hoehle, Joerg-Cyril 21 Jan '06

21 Jan '06

James Bielman wrote: >work with callback pointers in a manner that should be safe >when saving/reloading images. >I've made some progress updating the callback interface James, I'm sorry I've ran out of time and could not try out all your recent additions. >Jörg, in the CLISP implementation, I'm a little concerned about using >FFI::EXEC-ON-STACK to convert the functions to callbacks, but I Indeed, while I don't object using some ffi::... functions which look like they could have been exported if the FFI had embodied a layered approach, EXEC-ON-STACK is not among these. IMHO, EXEC-ON-STACK really is the lowest-level system-internal helper function, depending on other internals and revealing internal structure not meant for the outside. >couldn't find another way to get the effect of FFI:WITH-C-VAR at >runtime, given a parsed type. Indeed, "given a parsed type" is the problem here. Think in terms of conversions. You need a foreign place where to store a Lisp function: this causes generation of a callback, then you need to read it back to obtain the #<foreign-function> object. Therefore, a combination of (with-c-var (x 'c-pointer)), SETF CAST and MEMORY-AS should do the trick (just thinking aloud). The attached patch includes an answer involving only exported forms. + (ffi:with-foreign-object (ptr 'ffi:c-pointer) + ;; Create callback by converting Lisp function to foreign + (setf (ffi:memory-as ptr parsed-type) function) + ;; then construct #<FOREIGN-FUNCTION> object from pointer + ;;(ffi:memory-as ptr parsed-type) + ;; actually, cffi only keeps the pointer: + (ffi:foreign-value ptr))))) Note that your current code does not free replaced callbacks as the previous one did. You may want to put that back. Regard, Jörg Höhle.

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