82 lines
2.5 KiB
Factor
82 lines
2.5 KiB
Factor
! Copyright (C) 2004, 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: alien
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USING: assembler compiler errors generic hashtables kernel lists
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math namespaces parser strings words ;
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! Some code for interfacing with C structures.
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: define-getter ( offset type name -- )
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#! Define a word with stack effect ( alien -- obj ) in the
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#! current 'in' vocabulary.
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create-in >r
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[ "getter" get ] bind cons r> swap define-compound ;
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: define-setter ( offset type name -- )
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#! Define a word with stack effect ( obj alien -- ) in the
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#! current 'in' vocabulary.
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"set-" swap cat2 create-in >r
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[ "setter" get ] bind cons r> swap define-compound ;
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: define-field ( offset type name -- offset )
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>r c-type dup >r [ "align" get ] bind align r> r>
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"struct-name" get swap "-" swap cat3
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( offset type name -- )
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3dup define-getter 3dup define-setter
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drop [ "width" get ] bind + ;
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: define-member ( max type -- max )
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c-type [ "width" get ] bind max ;
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: struct-constructor ( width -- )
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#! Make a word <foo> where foo is the structure name that
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#! allocates a Factor heap-local instance of this structure.
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#! Used for C functions that expect you to pass in a struct.
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"struct-name" get constructor-word
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swap [ <byte-array> ] cons
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define-compound ;
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: array-constructor ( width -- )
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#! Make a word <foo-array> ( n -- byte-array ).
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"struct-name" get "-array" cat2 constructor-word
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swap [ * <byte-array> ] cons
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define-compound ;
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: define-nth ( width -- )
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#! Make a word foo-nth ( n alien -- dsplaced-alien ).
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"struct-name" get "-nth" cat2 create-in
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swap [ swap >r * r> <displaced-alien> ] cons
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define-compound ;
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: define-struct-type ( width -- )
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#! Define inline and pointer type for the struct. Pointer
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#! type is exactly like void*.
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dup struct-constructor
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dup array-constructor
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dup define-nth
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[
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"width" set
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cell "align" set
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[ swap <displaced-alien> ] "getter" set
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] "struct-name" get define-c-type
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"void*" c-type "struct-name" get "*" cat2
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c-types get set-hash ;
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: BEGIN-STRUCT: ( -- offset )
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scan "struct-name" set 0 ; parsing
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: FIELD: ( offset -- offset )
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scan scan define-field ; parsing
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: END-STRUCT ( length -- )
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define-struct-type ; parsing
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: BEGIN-UNION: ( -- max )
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scan "struct-name" set 0 ; parsing
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: MEMBER: ( max -- max )
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scan define-member ; parsing
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: END-UNION ( max -- )
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define-struct-type ; parsing
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