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70 lines
2.6 KiB
Scheme
70 lines
2.6 KiB
Scheme
;; Copyright 2009 Marc Feeley <feeley@iro.umontreal.ca>
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;; Licensed under Apache 2.0 or LGPL 2.1
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(define-macro (define-c-struct type . fields)
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(let* ((type-str
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(symbol->string type))
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(struct-type-str
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(string-append "struct " type-str))
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(release-type-str
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(string-append "release_" type-str))
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(sym
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(lambda strs (string->symbol (apply string-append strs))))
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(type*
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(sym type-str "*"))
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(type*/nonnull
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(sym type-str "*/nonnull"))
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(type*/release-rc
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(sym type-str "*/release-rc"))
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(expansion
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`(begin
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;; Release function which is called when the object
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;; is no longer accessible from the Scheme world
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(c-declare
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,(string-append
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"static ___SCMOBJ " release-type-str "(void* ptr)\n"
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"{\n"
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" ___EXT(___release_rc)(ptr);\n"
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" return ___FIX(___NO_ERR);\n"
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"}\n"))
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;; C types
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(c-define-type ,type (struct ,type-str))
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(c-define-type ,type* (pointer ,type (,type*)))
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(c-define-type ,type*/nonnull (nonnull-pointer ,type (,type*)))
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(c-define-type ,type*/release-rc (nonnull-pointer ,type (,type*) ,release-type-str))
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;; Type allocator procedure
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(define ,(sym "alloc-" type-str)
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(c-lambda ()
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,type*/release-rc
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,(string-append "___result_voidstar = ___EXT(___alloc_rc)(sizeof(" struct-type-str "));")))
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;; Field getters
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,@(map (lambda (field)
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(let ((field-str (symbol->string (car field)))
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(field-type (cadr field)))
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`(define ,(sym type-str "-" field-str)
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(c-lambda (,type*/nonnull)
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,field-type
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,(string-append "___result = ___arg1->" field-str ";")))))
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fields)
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;; Field setters
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,@(map (lambda (field)
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(let ((field-str (symbol->string (car field)))
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(field-type (cadr field)))
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`(define ,(sym type-str "-" field-str "-set!")
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(c-lambda (,type*/nonnull ,field-type)
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void
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,(string-append "___arg1->" field-str " = ___arg2;")))))
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fields))))
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expansion))
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