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;;; Ikarus Scheme -- A compiler for R6RS Scheme.
;;; Copyright (C) 2008,2009 Abdulaziz Ghuloum
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License version 3 as
;;; published by the Free Software Foundation.
;;;
;;; This program is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(library (ypsilon-compat)
(export on-windows on-darwin on-linux on-freebsd on-posix
load-shared-object c-argument c-function
microsecond usleep library-pointer
(rename (ypsilon:format format)))
(import
(ikarus system $foreign)
(except (ikarus) library))
(define (microsecond)
(let ([t (current-time)])
(+ (* (time-second t) 1000000)
(div (time-nanosecond t) 1000))))
(define (usleep . args) (error '#f "invalid args" args))
(define (ypsilon:format what str . args)
(cond
[(eq? what #t)
(apply printf str args)]
[(eq? what #f)
(apply format str args)]
[else (error 'ypsion:format "invalid what" what)]))
(define (architecture-feature what)
(case what
[(operating-system) (host-info)]
[else (error 'architecture-feature "invalid args" what)]))
(define (string-contains text s)
(define (starts-at? i)
(let f ([i i] [j 0])
(cond
[(= j (string-length s)) #t]
[(= i (string-length text)) #f]
[else
(and (char=? (string-ref text i) (string-ref s j))
(f (+ i 1) (+ j 1)))])))
(let f ([i 0])
(cond
[(= i (string-length text)) #f]
[(starts-at? i) #t]
[else (f (+ i 1))])))
(define on-windows (and (string-contains (architecture-feature 'operating-system) "windows") #t))
(define on-darwin (and (string-contains (architecture-feature 'operating-system) "darwin") #t))
(define on-linux (and (string-contains (architecture-feature 'operating-system) "linux") #t))
(define on-freebsd (and (string-contains (architecture-feature 'operating-system) "freebsd") #t))
(define on-posix (not on-windows))
(define-record-type library (fields name pointer))
(define (load-shared-object libname)
(unless (string? libname)
(error 'load-shared-object "library name must be a string"
libname))
(make-library libname
(or (dlopen libname)
(error 'load-shared-object (dlerror) libname))))
(define (int? x) (or (fixnum? x) (bignum? x)))
(define (check-int who x)
(cond
[(int? x) x]
[else (die who "not an int" x)]))
(define (vector-andmap f v)
(andmap f (vector->list v)))
(define (check-int* who x)
(cond
[(and (vector? x) (vector-andmap int? x))
(let ([n (vector-length x)])
(let ([p (malloc (* n 4))])
(let f ([i 0])
(cond
[(= i n) p]
[else
(pointer-set-c-int! p (* i 4) (vector-ref x i))
(f (+ i 1))]))))]
[else (die who "not an int*" x)]))
(define (check-char* who x)
(cond
[(string? x)
(check-byte* who (string->utf8 x))]
[else (die who "not a char*" x)]))
(define pointer-size
(cond
[(<= (fixnum-width) 32) 4]
[else 8]))
(define (check-char** who x)
(cond
[(and (vector? x) (vector-andmap string? x))
(let ([n (vector-length x)])
(let ([p (malloc (* n pointer-size))])
(let f ([i 0])
(cond
[(= i n) p]
[else
(pointer-set-c-pointer! p (* i pointer-size)
(check-char* who (vector-ref x i)))
(f (+ i 1))]))))]
[else (die who "not a char**" x)]))
(define (check-byte* who x)
(cond
[(bytevector? x)
(let ([n (bytevector-length x)])
(let ([p (malloc (+ n 1))])
(pointer-set-c-char! p n 0)
(let f ([i 0])
(cond
[(= i n) p]
[else
(pointer-set-c-char! p i (bytevector-u8-ref x i))
(f (+ i 1))]))))]
[else (die who "not a byte*" x)]))
(define (check-float who x)
(cond
[(flonum? x) x]
[else (die who "not a flonum" x)]))
(define (check-double who x)
(cond
[(flonum? x) x]
[else (die who "not a double" x)]))
(define-syntax check-callback
(lambda (x)
(syntax-case x ()
[(_ foreign-name val return-type (arg-type* ...))
#'(let ([t val])
(if (procedure? t)
((make-c-callback
(convert-type return-type)
(list (convert-type arg-type*) ...))
t)
(error 'foreign-name "not a procedure" t)))])))
(define-syntax todo
(syntax-rules ()
[(_ name* ...)
(begin
(define (name* . args) (error 'name* "not implemented"))
...)]))
(define (check-void* who x)
(cond
[(pointer? x) x]
[else (die who "not a void*" x)]))
(define-syntax convert-arg
(lambda (x)
(syntax-case x (int char* byte* c-callback float double void*)
[(_ form foreign-name val char*)
#'(check-char* 'foreign-name val)]
[(_ form foreign-name val byte*)
#'(check-byte* 'foreign-name val)]
[(_ form foreign-name val void*)
#'(check-void* 'foreign-name val)]
[(_ form foreign-name val int)
#'(check-int 'foreign-name val)]
[(_ form foreign-name val float)
#'(check-float 'foreign-name val)]
[(_ form foreign-name val double)
#'(check-double 'foreign-name val)]
[(_ form foreign-name val [int])
#'(check-int* 'foreign-name val)]
[(_ form foreign-name val [char*])
#'(check-char** 'foreign-name val)]
[(_ form foreign-name val [c-callback return-type (arg-types ...)])
#'(check-callback foreign-name val return-type (arg-types ...))]
[(_ form foreign-name val arg-type)
(syntax-violation 'c-function "invalid argument type"
#'form #'arg-type)])))
(define (convert-out-byte* who s-val c-val)
(let ((n (bytevector-length s-val)))
(let loop ([i 0])
(unless (= i n)
(bytevector-u8-set! s-val i (pointer-ref-c-unsigned-char c-val i))
(loop (+ i 1))))))
(define-syntax convert-out-arg
(lambda (x)
(syntax-case x (int char* byte* c-callback float double void*)
((_ form foreign-name s-val c-val byte*)
#'(convert-out-byte* 'foreign-name s-val c-val))
((_ form foreign-name s-val c-val arg-ype)
#'(void)))))
(define (char*->string who x)
(define (strlen x)
(let f ([i 0])
(cond
[(= 0 (pointer-ref-c-unsigned-char x i)) i]
[else (f (+ i 1))])))
(let ([n (strlen x)])
(let ([s (make-string n)])
(let f ([i 0])
(if (= i n)
s
(begin
(string-set! s i
(integer->char (pointer-ref-c-unsigned-char x i)))
(f (+ i 1))))))))
(define-syntax convert-return
(lambda (x)
(syntax-case x (char*)
[(_ form foreign-name val char*)
#'(char*->string 'foreign-name val)]
[(_ form foreign-name val other)
#'val])))
(define-syntax convert-type
(lambda (x)
(define ls
'([void void]
[char* pointer]
[float float]
[double double]
[void* pointer]
[byte* pointer]
[int signed-int]))
(define (valid x)
(cond
[(and (list? x) (= (length x) 3) (eq? (car x) 'c-callback))
(and (valid (cadr x))
(andmap valid (caddr x))
'pointer)]
[(list? x)
(and (andmap valid x) 'pointer)]
[(assq x ls) => cadr]
[else #f]))
(syntax-case x (void)
[(ctxt t)
(cond
[(valid (syntax->datum #'t)) =>
(lambda (t)
(with-syntax ([t (datum->syntax #'ctxt t)])
#'(quote t)))]
[else (syntax-violation #f "invalid type" #'t)])])))
(define (lookup-shared-object lib name)
(define who 'lookup-shared-object)
(unless (symbol? name) (die who "not a symbol" name))
(unless (library? lib) (die who "not a library" lib))
(or (dlsym (library-pointer lib) (symbol->string name))
(error who
(format "cannot find object ~a in library ~a"
name (library-name lib)))))
(define-syntax c-function
(lambda (x)
(syntax-case x ()
[(_ lib lib-name return-type conv foreign-name (arg-type* ...))
(with-syntax ([x x]
[(t* ...) (generate-temporaries #'(arg-type* ...))]
[(u* ...) (generate-temporaries #'(arg-type* ...))])
#'(let ([callout
((make-c-callout
(convert-type return-type)
(list (convert-type arg-type*) ...))
(lookup-shared-object lib 'foreign-name))])
(lambda (t* ...)
(let ([u* (convert-arg x foreign-name t* arg-type*)] ...)
(let ([v (callout u* ...)])
(convert-out-arg x foreign-name t* u* arg-type*)
...
(convert-return x foreign-name v return-type))))))])))
(define-syntax c-argument
(lambda (x)
(syntax-case x ()
[(_ function-name argnum argtype argval)
(begin
;(printf "syntax ~s\n" (syntax->datum x))
#'(void))])))
)
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