214 lines
9.4 KiB
Scheme
214 lines
9.4 KiB
Scheme
(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 'string) (size-of-pointer))
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((eq? type 'struct) (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 pffi-shared-object-load
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(lambda (headers path . options)
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(let ((shared-object (dlopen path RTLD-NOW))
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(maybe-error (dlerror)))
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(when (not (pffi-pointer-null? maybe-error))
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(error (pffi-pointer->string maybe-error)))
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shared-object)))
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(define pffi-pointer-null
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(lambda ()
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(pointer-null)))
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(define pffi-pointer-null?
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(lambda (pointer)
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(not pointer))) ; #f is null on Chibi
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(define pffi-pointer?
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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-pointer-allocate
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(lambda (size)
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(pointer-allocate size)))
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(define pffi-pointer-address
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(lambda (pointer)
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(pointer-address pointer)))
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(define pffi-pointer-free
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(lambda (pointer)
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(pointer-free pointer)))
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(define pffi-pointer-set!
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(lambda (pointer type offset value)
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(cond ((equal? type 'int8) (pointer-set-c-int8_t! pointer offset value))
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((equal? type 'uint8) (pointer-set-c-uint8_t! pointer offset value))
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((equal? type 'int16) (pointer-set-c-int16_t! pointer offset value))
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((equal? type 'uint16) (pointer-set-c-uint16_t! pointer offset value))
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((equal? type 'int32) (pointer-set-c-int32_t! pointer offset value))
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((equal? type 'uint32) (pointer-set-c-uint32_t! pointer offset value))
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((equal? type 'int64) (pointer-set-c-int64_t! pointer offset value))
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((equal? type 'uint64) (pointer-set-c-uint64_t! pointer offset value))
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((equal? type 'char) (pointer-set-c-char! pointer offset value))
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((equal? type 'short) (pointer-set-c-short! pointer offset value))
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((equal? type 'unsigned-short) (pointer-set-c-unsigned-short! pointer offset value))
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((equal? type 'int) (pointer-set-c-int! pointer offset value))
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((equal? type 'unsigned-int) (pointer-set-c-unsigned-int! pointer offset value))
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((equal? type 'long) (pointer-set-c-long! pointer offset value))
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((equal? type 'unsigned-long) (pointer-set-c-unsigned-long! pointer offset value))
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((equal? type 'float) (pointer-set-c-float! pointer offset value))
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((equal? type 'double) (pointer-set-c-double! pointer offset value))
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((equal? type 'void) (pointer-set-c-pointer! pointer offset value))
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((equal? type 'pointer) (pointer-set-c-pointer! pointer offset value)))))
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(define pffi-pointer-get
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(lambda (pointer type offset)
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(cond ((equal? type 'int8) (pointer-ref-c-int8_t pointer offset))
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((equal? type 'uint8) (pointer-ref-c-uint8_t pointer offset))
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((equal? type 'int16) (pointer-ref-c-int16_t pointer offset))
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((equal? type 'uint16) (pointer-ref-c-uint16_t pointer offset))
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((equal? type 'int32) (pointer-ref-c-int32_t pointer offset))
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((equal? type 'uint32) (pointer-ref-c-uint32_t pointer offset))
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((equal? type 'int64) (pointer-ref-c-int64_t pointer offset))
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((equal? type 'uint64) (pointer-ref-c-uint64_t pointer offset))
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((equal? type 'char) (pointer-ref-c-char pointer offset))
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((equal? type 'short) (pointer-ref-c-short pointer offset))
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((equal? type 'unsigned-short) (pointer-ref-c-unsigned-short pointer offset))
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((equal? type 'int) (pointer-ref-c-int pointer offset))
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((equal? type 'unsigned-int) (pointer-ref-c-unsigned-int pointer offset))
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((equal? type 'long) (pointer-ref-c-long pointer offset))
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((equal? type 'unsigned-long) (pointer-ref-c-unsigned-long pointer offset))
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((equal? type 'float) (pointer-ref-c-float pointer offset))
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((equal? type 'double) (pointer-ref-c-double pointer offset))
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((equal? type 'void) (pointer-ref-c-pointer pointer offset))
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((equal? type 'pointer) (pointer-ref-c-pointer pointer offset)))))
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#;(define pffi-string->pointer
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(lambda (string-content)
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(string-to-pointer string-content)))
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#;(define pffi-pointer->string
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(lambda (pointer)
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(pointer-to-string pointer)))
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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 void*))
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((equal? type 'string) 'string)
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((equal? type 'void) 'void)
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((equal? type 'callback) '(maybe-null void*))
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(else (error "pffi-type->native-type -- No such pffi type" type)))))
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;; pffi-define
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(define pffi-type->libffi-type
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(lambda (type)
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(cond ((equal? type 'int8) (get-ffi-type-int8))
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((equal? type 'uint8) (get-ffi-type-uint8))
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((equal? type 'int16) (get-ffi-type-int16))
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((equal? type 'uint16) (get-ffi-type-uint16))
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((equal? type 'int32) (get-ffi-type-int32))
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((equal? type 'uint32) (get-ffi-type-uint32))
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((equal? type 'int64) (get-ffi-type-int64))
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((equal? type 'uint64) (get-ffi-type-uint64))
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((equal? type 'char) (get-ffi-type-char))
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((equal? type 'unsigned-char) (get-ffi-type-uchar))
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((equal? type 'bool) (get-ffi-type-int8))
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((equal? type 'short) (get-ffi-type-short))
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((equal? type 'unsigned-short) (get-ffi-type-ushort))
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((equal? type 'int) (get-ffi-type-int))
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((equal? type 'unsigned-int) (get-ffi-type-uint))
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((equal? type 'long) (get-ffi-type-long))
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((equal? type 'unsigned-long) (get-ffi-type-ulong))
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((equal? type 'float) (get-ffi-type-float))
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((equal? type 'double) (get-ffi-type-double))
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((equal? type 'void) (get-ffi-type-void))
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((equal? type 'pointer) (get-ffi-type-pointer))
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((equal? type 'callback) (get-ffi-type-pointer)))))
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(define argument->pointer
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(lambda (value type)
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(cond ((procedure? value) (scheme-procedure-to-pointer value))
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(else (let ((pointer (pffi-pointer-allocate (size-of-type type))))
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(pffi-pointer-set! pointer type 0 value)
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pointer)))))
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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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(when (not (pffi-pointer-null? maybe-dlerror))
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(error (pffi-pointer->string maybe-dlerror)))
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(lambda arguments
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(let ((return-value (pffi-pointer-allocate
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(if (equal? return-type 'void)
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0
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(size-of-type return-type)))))
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(internal-ffi-call (length argument-types)
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(pffi-type->libffi-type return-type)
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(map pffi-type->libffi-type argument-types)
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c-function
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return-value
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(map argument->pointer
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arguments
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argument-types))
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(cond ((not (equal? return-type 'void))
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(pffi-pointer-get return-value return-type 0))))))))
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(define-syntax pffi-define
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(syntax-rules ()
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((pffi-define 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 pffi-define-callback
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(syntax-rules ()
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((pffi-define 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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