1 ! (c)2009, 2010 Slava Pestov, Joe Groff bsd license
2 USING: accessors alien alien.c-types alien.arrays alien.strings
3 arrays byte-arrays cpu.architecture fry io io.encodings.binary
4 io.files io.streams.memory kernel libc math math.functions
5 sequences words macros combinators generalizations
6 stack-checker.dependencies combinators.short-circuit ;
10 : <ref> ( value c-type -- c-ptr )
11 [ heap-size <byte-array> ] keep
12 '[ 0 _ set-alien-value ] keep ; inline
14 : deref ( c-ptr c-type -- value )
15 [ 0 ] dip alien-value ; inline
17 : little-endian? ( -- ? ) 1 int <ref> char deref 1 = ; foldable
19 GENERIC: c-array-constructor ( c-type -- word ) foldable
21 GENERIC: c-(array)-constructor ( c-type -- word ) foldable
23 GENERIC: c-direct-array-constructor ( c-type -- word ) foldable
25 GENERIC: <c-array> ( len c-type -- array )
28 c-array-constructor execute( len -- array ) ; inline
31 drop void* <c-array> ;
33 GENERIC: (c-array) ( len c-type -- array )
36 c-(array)-constructor execute( len -- array ) ; inline
39 drop void* (c-array) ;
41 GENERIC: <c-direct-array> ( alien len c-type -- array )
43 M: word <c-direct-array>
44 c-direct-array-constructor execute( alien len -- array ) ; inline
46 M: pointer <c-direct-array>
47 drop void* <c-direct-array> ;
49 : malloc-array ( n type -- array )
50 [ heap-size calloc ] [ <c-direct-array> ] 2bi ; inline
52 : malloc-byte-array ( byte-array -- alien )
53 binary-object [ nip malloc dup ] 2keep memcpy ;
55 : memory>byte-array ( alien len -- byte-array )
56 [ nip (byte-array) dup ] 2keep memcpy ;
58 : malloc-string ( string encoding -- alien )
59 string>alien malloc-byte-array ;
61 M: memory-stream stream-read
63 [ index>> ] [ alien>> ] bi <displaced-alien>
64 swap memory>byte-array
65 ] [ [ + ] change-index drop ] 2bi ;
67 M: value-type c-type-rep drop int-rep ;
69 M: value-type c-type-getter
70 drop [ swap <displaced-alien> ] ;
72 M: value-type c-type-copier
73 heap-size '[ _ memory>byte-array ] ;
75 M: value-type c-type-setter
76 [ c-type-getter ] [ heap-size ] bi '[ @ swap _ memcpy ] ;
78 M: array c-type-boxer-quot
79 unclip [ array-length ] dip [ <c-direct-array> ] 2curry ;
81 M: array c-type-unboxer-quot drop [ >c-ptr ] ;
83 ERROR: local-allocation-error ;
87 : (local-allot) ( size align -- alien ) local-allocation-error ;
89 : (cleanup-allot) ( -- )
90 ! Inhibit TCO in order for the last word in the quotation
91 ! to still be abl to access scope-allocated data.
94 MACRO: (simple-local-allot) ( c-type -- quot )
96 [ dup '[ _ heap-size _ c-type-align (local-allot) ] ] bi ;
98 : [hairy-local-allot] ( c-type initial -- quot )
99 over '[ _ (simple-local-allot) _ over 0 _ set-alien-value ] ;
101 : hairy-local-allot? ( obj -- ? )
105 [ second initial: eq? ]
108 MACRO: (hairy-local-allot) ( obj -- quot )
109 dup hairy-local-allot?
110 [ first3 nip [hairy-local-allot] ]
111 [ '[ _ (simple-local-allot) ] ]
114 MACRO: (local-allots) ( c-types -- quot )
115 [ '[ _ (hairy-local-allot) ] ] map [ ] join ;
117 MACRO: box-values ( c-types -- quot )
118 [ c-type-boxer-quot ] map '[ _ spread ] ;
120 MACRO: out-parameters ( c-types -- quot )
121 [ dup hairy-local-allot? [ first ] when ] map
122 [ length ] [ [ '[ 0 _ alien-copy-value ] ] map ] bi
123 '[ _ nkeep _ spread ] ;
127 : with-scoped-allocation ( c-types quot -- )
128 [ [ (local-allots) ] [ box-values ] bi ] dip call
129 (cleanup-allot) ; inline
131 : with-out-parameters ( c-types quot -- values... )
132 [ drop (local-allots) ] [ swap out-parameters ] 2bi
133 (cleanup-allot) ; inline
135 GENERIC: binary-zero? ( value -- ? )
137 M: object binary-zero? drop f ; inline
138 M: f binary-zero? drop t ; inline
139 M: integer binary-zero? zero? ; inline
140 M: math:float binary-zero? double>bits zero? ; inline
141 M: complex binary-zero? >rect [ binary-zero? ] both? ; inline