[gambit-list] calling interpreted scheme code from compiled C
James Long
longster at gmail.com
Tue Jan 20 01:32:13 EST 2009
The warning is just a warning. It's a common message from Gambit when
dynamically loading libraries. The issue is that when a library is
loaded, it references a few functions which don't exist yet. Most
likely these requirements will fulfilled by loading other libraries
which define those functions. For example:
;;test.scm
(c-define (foo) () void "foo" ""
(bar))
;;test2.scm
(define (bar)
(display "hello"))
% gsc test.scm
% gsi
Gambit v4.3.2
> (load "test")
*** WARNING -- Variable "bar" used in module "test.o1" is undefined
"~/test.o1"
> (load "test2")
"~/test2.scm"
> (foo)
hello>
So it's probably just a timing issue. You could add `(load "test")'
at the top of wrapper.scm and compile wrapper.scm, and then run `gsi
wrapper.o1' instead.
On Jan 19, 2009, at 8:48 PM, TongKe Xue wrote:
> Sorry, that last line should say:
>
> gsi test.scm
> *** WARNING -- Variable "disp" used in module "wrapper-s" is undefined
>
>
>
> On Mon, Jan 19, 2009 at 5:43 PM, symbolic expression <symbolic.expression at gmail.com
> > wrote:
> hi!
>
> I have wrapper.scm (which is compiled code), and test.scm (which
> is interpreted)
>
> i.e. (compile-file-to-c "wrapper"); (link-flat '("wrapper ...)
> output: "blah.o1.c"); gcc -shared -fPIC ... blah.o1.c -o blah.o1
>
> test.scm:
> (load "blah")
> ...
>
> and I run everything with "gsi test.scm"
>
> Now, here's the problem. In test.scm, I need to call a
> glutDisplayFunc, which requires a _C_ callback. Okay, so I define
> function with (c-define (c-disp ...) ... (disp)). (disp) is the
> scheme funfction that does the real workd; c-disp is a c wrapper
> around disp. Since test.scm is interpted, I have to put it in
> wrapper.scm -- however, I want to keep disp in test.scm (rapid
> prototypinhg, changing it on the fly, etc ...). Question is, how can
> I get c-disp (which is in wrapper.scm) to get call (disp), which is
> in test.scm?
>
> if I just do wrapper.scm:
>
> (c-define (c-disp) () void "f" "" (disp))
>
> and test.scm:
> (load "graphics")
>
> ;(c-define (c-disp) () void "f" "" (disp))
>
> (define (disp)
> (glClear GL_COLOR_BUFFER_BIT)
> (glutWireTeapot 0.5))
>
> and run gsi test.scm, I get:
>
> $gsi test.scm
> *** WARNING -- Variable "format" used in module "wrapper-s" is
> undefined
>
> so the question is ... how can i get compile scheme code to 'wait'
> in order to call interpted scheme code?
>
> thanks!
>
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