176 lines
7.8 KiB
Scheme
176 lines
7.8 KiB
Scheme
(define c-bytevector-get
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(lambda (pointer type offset)
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(cond ((equal? type 'int8) (c-bytevector-s8-ref pointer offset))
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((equal? type 'uint8) (c-bytevector-u8-ref pointer offset))
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((equal? type 'int16) (c-bytevector-s16-ref pointer offset))
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((equal? type 'uint16) (c-bytevector-u16-ref pointer offset))
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((equal? type 'int32) (c-bytevector-s32-ref pointer offset))
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((equal? type 'uint32) (c-bytevector-u32-ref pointer offset))
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((equal? type 'int64) (c-bytevector-s64-ref pointer offset))
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((equal? type 'uint64) (c-bytevector-u64-ref pointer offset))
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((equal? type 'char) (integer->char (c-bytevector-s8-ref pointer offset)))
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((equal? type 'unsigned-char) (integer->char (c-bytevector-u8-ref pointer offset)))
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((equal? type 'short) (c-bytevector-sint-ref pointer offset (native-endianness) (size-of-type 'short)))
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((equal? type 'unsigned-short) (c-bytevector-sint-ref pointer offset (native-endianness) (size-of-type 'unsigned-short)))
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((equal? type 'int) (c-bytevector-sint-ref pointer offset (native-endianness) (size-of-type 'int)))
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((equal? type 'unsigned-int) (c-bytevector-sint-ref pointer offset (native-endianness) (size-of-type 'unsigned-int)))
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((equal? type 'long) (c-bytevector-sint-ref pointer offset (native-endianness) (sife-of-type 'long)))
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((equal? type 'unsigned-long) (c-bytevector-sint-ref pointer offset (native-endianness) (size-of-type 'unsigned-long)))
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((equal? type 'float) (c-bytevector-ieee-single-native-ref pointer offset))
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((equal? type 'double) (c-bytevector-ieee-double-native-ref pointer offset))
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((equal? type 'pointer) (c-bytevector-pointer-ref pointer offset))
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((not (equal? type 'void)) (error "No such foreign type" type))
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;; Return unspecified on purpose if type is void
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)))
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(define type->libffi-type-number
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(lambda (type)
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(cond ((equal? type 'int8) 1)
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((equal? type 'uint8) 2)
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((equal? type 'int16) 3)
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((equal? type 'uint16) 4)
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((equal? type 'int32) 5)
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((equal? type 'uint32) 6)
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((equal? type 'int64) 7)
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((equal? type 'uint64) 8)
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((equal? type 'char) 9)
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((equal? type 'unsigned-char) 10)
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((equal? type 'short) 11)
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((equal? type 'unsigned-short) 12)
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((equal? type 'int) 13)
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((equal? type 'unsigned-int) 14)
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((equal? type 'long) 15)
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((equal? type 'unsigned-long) 16)
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((equal? type 'float) 17)
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((equal? type 'double) 18)
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((equal? type 'void) 19)
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((equal? type 'pointer) 20)
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((equal? type 'pointer-address) 21)
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((equal? type 'callback) 22)
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(else (error "Undefined type" type)))))
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(define size-of-type
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(lambda (type)
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(cond ((eq? type 'int8) (size-of-int8_t))
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((eq? type 'uint8) (size-of-uint8_t))
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((eq? type 'int16) (size-of-int16_t))
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((eq? type 'uint16) (size-of-uint16_t))
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((eq? type 'int32) (size-of-int32_t))
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((eq? type 'uint32) (size-of-uint32_t))
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((eq? type 'int64) (size-of-int64_t))
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((eq? type 'uint64) (size-of-uint64_t))
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((eq? type 'char) (size-of-char))
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((eq? type 'unsigned-char) (size-of-char))
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((eq? type 'short) (size-of-short))
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((eq? type 'unsigned-short) (size-of-unsigned-short))
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((eq? type 'int) (size-of-int))
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((eq? type 'unsigned-int) (size-of-unsigned-int))
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((eq? type 'long) (size-of-long))
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((eq? type 'unsigned-long) (size-of-unsigned-long))
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((eq? type 'float) (size-of-float))
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((eq? type 'double) (size-of-double))
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((eq? type 'pointer) (size-of-pointer))
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((eq? type 'pointer-address) (size-of-pointer))
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((eq? type 'callback) (size-of-pointer))
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((eq? type 'void) 0)
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(else #f))))
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(define align-of-type
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(lambda (type)
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(cond ((eq? type 'int8) (align-of-int8_t))
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((eq? type 'uint8) (align-of-uint8_t))
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((eq? type 'int16) (align-of-int16_t))
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((eq? type 'uint16) (align-of-uint16_t))
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((eq? type 'int32) (align-of-int32_t))
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((eq? type 'uint32) (align-of-uint32_t))
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((eq? type 'int64) (align-of-int64_t))
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((eq? type 'uint64) (align-of-uint64_t))
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((eq? type 'char) (align-of-char))
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((eq? type 'unsigned-char) (align-of-char))
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((eq? type 'short) (align-of-short))
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((eq? type 'unsigned-short) (align-of-unsigned-short))
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((eq? type 'int) (align-of-int))
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((eq? type 'unsigned-int) (align-of-unsigned-int))
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((eq? type 'long) (align-of-long))
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((eq? type 'unsigned-long) (align-of-unsigned-long))
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((eq? type 'float) (align-of-float))
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((eq? type 'double) (align-of-double))
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((eq? type 'pointer) (align-of-pointer))
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((eq? type 'pointer-address) (align-of-pointer))
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((eq? type 'callback) (align-of-pointer))
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((eq? type 'void) 0)
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(else #f))))
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(define shared-object-load
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(lambda (path options)
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(let ((shared-object (dlopen path RTLD-NOW))
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(maybe-error (dlerror)))
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shared-object)))
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(define c-bytevector?
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(lambda (object)
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(or (equal? object #f) ; False can be null pointer
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(pointer? object))))
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(define pffi-type->native-type
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(lambda (type)
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(cond ((equal? type 'int8) 'int8_t)
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((equal? type 'uint8) 'uint8_t)
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((equal? type 'int16) 'int16_t)
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((equal? type 'uint16) 'uint16_t)
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((equal? type 'int32) 'int32_t)
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((equal? type 'uint32) 'uint32_t)
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((equal? type 'int64) 'int64_t)
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((equal? type 'uint64) 'uint64_t)
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((equal? type 'char) 'char)
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((equal? type 'unsigned-char) 'char)
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((equal? type 'short) 'short)
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((equal? type 'unsigned-short) 'unsigned-short)
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((equal? type 'int) 'int)
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((equal? type 'unsigned-int) 'unsigned-int)
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((equal? type 'long) 'long)
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((equal? type 'unsigned-long) 'unsigned-long)
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((equal? type 'float) 'float)
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((equal? type 'double) 'double)
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((equal? type 'pointer) '(maybe-null pointer void*))
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((equal? type 'pointer-address) '(maybe-null pointer void*))
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((equal? type 'void) 'void)
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((equal? type 'callback) '(maybe-null pointer void*))
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(else (error "pffi-type->native-type -- No such pffi type" type)))))
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;; define-c-procedure
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(define make-c-function
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(lambda (shared-object c-name return-type argument-types)
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(dlerror) ;; Clean all previous errors
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(let ((c-function (dlsym shared-object c-name))
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(maybe-dlerror (dlerror)))
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(lambda arguments
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(let* ((return-pointer
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(internal-ffi-call (length argument-types)
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(type->libffi-type-number return-type)
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(map type->libffi-type-number argument-types)
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c-function
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(size-of-type return-type)
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arguments)))
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(c-bytevector-get return-pointer return-type 0))))))
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(define-syntax define-c-procedure
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(syntax-rules ()
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((_ scheme-name shared-object c-name return-type argument-types)
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(define scheme-name
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(make-c-function shared-object
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(symbol->string c-name)
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return-type
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argument-types)))))
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(define make-c-callback
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(lambda (return-type argument-types procedure)
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(scheme-procedure-to-pointer procedure)))
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(define-syntax define-c-callback
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(syntax-rules ()
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((_ scheme-name return-type argument-types procedure)
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(define scheme-name
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(make-c-callback return-type 'argument-types procedure)))))
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