259 lines
8.6 KiB
Scheme
259 lines
8.6 KiB
Scheme
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(library (ikarus.pointers)
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(export pointer? integer->pointer pointer->integer
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dlopen dlerror dlclose dlsym malloc free
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pointer-ref-signed-char
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pointer-ref-signed-short
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pointer-ref-signed-int
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pointer-ref-signed-long
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pointer-ref-unsigned-char
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pointer-ref-unsigned-short
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pointer-ref-unsigned-int
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pointer-ref-unsigned-long
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pointer-set-char pointer-set-short pointer-set-int pointer-set-long
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pointer-set-pointer pointer-ref-pointer
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pointer-set-float pointer-ref-float
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pointer-set-double pointer-ref-double
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make-callout make-callback)
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(import
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(except (ikarus)
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pointer?
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integer->pointer pointer->integer
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dlopen dlerror dlclose dlsym malloc free))
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;;; pointer manipulation procedures
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(define (pointer? x)
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(foreign-call "ikrt_isapointer" x))
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(define (integer->pointer x)
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(cond
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[(fixnum? x)
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(foreign-call "ikrt_fx_to_pointer" x)]
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[(bignum? x)
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(foreign-call "ikrt_bn_to_pointer" x)]
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[else
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(die 'integer->pointer "not an integer" x)]))
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(define (pointer->integer x)
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(cond
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[(pointer? x)
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(foreign-call "ikrt_pointer_to_int" x)]
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[else
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(die 'pointer->integer "not a pointer" x)]))
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;;; dynamic loading procedures
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(define dlerror
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(lambda ()
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(let ([p (foreign-call "ikrt_dlerror")])
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(and p (utf8->string p)))))
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(define dlopen
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(let ()
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(define (open x lazy? global?)
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(foreign-call "ikrt_dlopen" x lazy? global?))
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(case-lambda
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[()
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(open #f #f #f)]
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[(x)
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(dlopen x #f #f)]
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[(x lazy? global?)
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(cond
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[(string? x) (open (string->utf8 x) lazy? global?)]
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[else (die 'dlopen "library name must be a string" x)])])))
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(define dlclose
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(lambda (x)
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(if (pointer? x)
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(foreign-call "ikrt_dlclose" x)
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(die 'dlclose "not a pointer" x))))
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(define dlsym
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(lambda (handle name)
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(define who 'dlsym)
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(if (pointer? handle)
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(if (string? name)
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(foreign-call "ikrt_dlsym" handle (string->utf8 name))
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(die who "invalid symbol name" name))
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(die who "handle is not a pointer" handle))))
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;;; explicit memory management
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(define (malloc len)
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(if (and (fixnum? len) (fx>? len 0))
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(foreign-call "ikrt_malloc" len)
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(die 'malloc "not a positive fixnum" len)))
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(define (free x)
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(if (pointer? x)
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(foreign-call "ikrt_free" x)
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(die 'free "not a pointer" x)))
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;;; getters and setters
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(define-syntax define-getter
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(syntax-rules ()
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[(_ name foreign-name)
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(define name
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(lambda (p i)
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(if (pointer? p)
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(if (fixnum? i)
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(foreign-call foreign-name p i)
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(die 'name "index is not a fixnum" i))
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(die 'name "not a pointer" p))))]))
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(define-syntax define-setter
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(syntax-rules ()
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[(_ name pred? foreign-name)
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(define name
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(lambda (p i v)
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(if (pointer? p)
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(if (fixnum? i)
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(if (pred? v)
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(foreign-call foreign-name p i v)
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(die 'name
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(format "value must satisfy the predicate ~a" 'pred?)
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v))
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(die 'name "index is not a fixnum" i))
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(die 'name "not a pointer" p))))]))
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(define (int? x) (or (fixnum? x) (bignum? x)))
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(define-getter pointer-ref-signed-char "ikrt_ref_char")
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(define-getter pointer-ref-signed-short "ikrt_ref_short")
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(define-getter pointer-ref-signed-int "ikrt_ref_int")
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(define-getter pointer-ref-signed-long "ikrt_ref_long")
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(define-getter pointer-ref-unsigned-char "ikrt_ref_uchar")
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(define-getter pointer-ref-unsigned-short "ikrt_ref_ushort")
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(define-getter pointer-ref-unsigned-int "ikrt_ref_uint")
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(define-getter pointer-ref-unsigned-long "ikrt_ref_ulong")
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(define-getter pointer-ref-float "ikrt_ref_float")
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(define-getter pointer-ref-double "ikrt_ref_double")
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(define-getter pointer-ref-pointer "ikrt_ref_pointer")
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(define-setter pointer-set-char int? "ikrt_set_char")
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(define-setter pointer-set-short int? "ikrt_set_short")
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(define-setter pointer-set-int int? "ikrt_set_int")
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(define-setter pointer-set-long int? "ikrt_set_long")
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(define-setter pointer-set-float flonum? "ikrt_set_float")
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(define-setter pointer-set-double flonum? "ikrt_set_double")
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(define-setter pointer-set-pointer pointer? "ikrt_set_pointer")
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;;; libffi interface
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(define (checker who)
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(define (checker t)
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(cond
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[(vector? t)
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(let ([t* (vector-map checker t)])
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(lambda (v)
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(and (vector? v)
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(let ([n (vector-length v)])
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(and (= n (vector-length t))
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(let f ([i 0])
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(or (= i n)
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(and ((vector-ref t* i) (vector-ref v i))
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(f (+ i 1))))))))))]
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[else
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(case t
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[(unsigned-char) int?]
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[(signed-char) int?]
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[(unsigned-short) int?]
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[(signed-short) int?]
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[(unsigned-int) int?]
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[(signed-int) int?]
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[(unsigned-long) int?]
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[(signed-long) int?]
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[(float) flonum?]
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[(double) flonum?]
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[(pointer) pointer?]
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[else (die who "invalid type" t)])]))
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checker)
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(define (ffi-prep-cif rtype argtypes)
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(define who 'ffi-prep-cif)
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(define (convert x)
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(cond
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[(vector? x) (vector-map convert x)]
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[else
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(case x
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[(void) 1]
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[(unsigned-char) 2]
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[(signed-char) 3]
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[(unsigned-short) 4]
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[(signed-short) 5]
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[(unsigned-int) 6]
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[(signed-int) 7]
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[(unsigned-long) 8]
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[(signed-long) 9]
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[(float) 10]
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[(double) 11]
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[(pointer) 12]
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[else (die who "invalid type" x)])]))
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(unless (list? argtypes)
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(die who "arg types is not a list" argtypes))
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(let ([argtypes-n (vector-map convert (list->vector argtypes))]
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[rtype-n (convert rtype)])
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(values (or (foreign-call "ikrt_ffi_prep_cif" rtype-n argtypes-n)
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(die who "failed to initialize" rtype argtypes))
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argtypes-n
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rtype-n)))
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(define (make-callout rtype argtypes)
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(define who 'make-callout)
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(let-values ([(cif argtypes-n rtype-n)
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(ffi-prep-cif rtype argtypes)])
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(let* ([argtypes-vec (list->vector argtypes)]
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[checkers (vector-map (checker who) argtypes-vec)])
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(lambda (cfun)
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(define data (vector cif cfun argtypes-n rtype-n))
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(unless (pointer? cfun)
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(die who "not a pointer" cfun))
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(lambda args
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(let ([argsvec (list->vector args)])
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(unless (= (vector-length argsvec)
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(vector-length argtypes-vec))
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(error 'callout-procedure "arg length mismatch"
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(vector->list argtypes-vec)
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args))
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(vector-for-each
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(lambda (p? t x)
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(unless (p? x)
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(die 'callout-procedure
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(format "argument does not match type ~a" t)
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x)))
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checkers argtypes-vec argsvec)
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(foreign-call "ikrt_ffi_call" data argsvec)))))))
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(define (make-callback rtype argtypes)
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(let-values ([(cif argtypes-n rtype-n)
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(ffi-prep-cif rtype argtypes)])
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(lambda (proc)
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(define who 'make-callback)
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(unless (procedure? proc)
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(die who "not a procedure"))
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(let ([proc
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(cond
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[(eq? rtype 'void) proc]
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[else
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(let ([p? ((checker who) rtype)])
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(lambda args
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(let ([v (apply proc args)])
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(unless (p? v)
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(die 'callback
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(format "returned value does not match type ~a"
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rtype)
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v))
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v)))])])
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(let ([data (vector cif proc argtypes-n rtype-n)])
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(or (foreign-call "ikrt_prepare_callback" data)
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(die who "cannot prepare foreign callback")))))))
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)
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