1 ! (c)2009, 2010 Slava Pestov, Joe Groff bsd license
2 USING: accessors alien alien.arrays alien.c-types alien.strings
3 arrays byte-arrays combinators combinators.short-circuit
4 cpu.architecture fry generalizations io io.streams.memory kernel
5 libc macros math math.functions parser sequences
6 stack-checker.dependencies summary words ;
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-type ( c-type -- word ) foldable
27 GENERIC: c-array-type? ( c-type -- word ) foldable
29 GENERIC: c-array? ( obj c-type -- ? ) foldable
32 c-array-type? execute( seq -- array ) ; inline
37 GENERIC: >c-array ( seq c-type -- array )
40 c-array-type new clone-like ;
45 GENERIC: <c-array> ( len c-type -- array )
48 c-array-constructor execute( len -- array ) ; inline
51 drop void* <c-array> ;
53 GENERIC: (c-array) ( len c-type -- array )
56 c-(array)-constructor execute( len -- array ) ; inline
59 drop void* (c-array) ;
61 GENERIC: <c-direct-array> ( alien len c-type -- array )
63 M: word <c-direct-array>
64 c-direct-array-constructor execute( alien len -- array ) ; inline
66 M: pointer <c-direct-array>
67 drop void* <c-direct-array> ;
69 SYNTAX: c-array{ \ } [ unclip >c-array ] parse-literal ;
72 scan-object [ scan-object scan-object ] dip
73 <c-direct-array> suffix! ;
75 ERROR: bad-byte-array-length byte-array type ;
77 M: bad-byte-array-length summary
78 drop "Byte array length doesn't divide type width" ;
80 : cast-array ( byte-array c-type -- array )
81 [ binary-object ] dip [ heap-size /mod 0 = ] keep swap
82 [ <c-direct-array> ] [ bad-byte-array-length ] if ; inline
84 : malloc-array ( n c-type -- array )
85 [ heap-size calloc ] [ <c-direct-array> ] 2bi ; inline
87 : malloc-byte-array ( byte-array -- alien )
88 binary-object [ nip malloc dup ] 2keep memcpy ;
90 : memory>byte-array ( alien len -- byte-array )
91 [ nip (byte-array) dup ] 2keep memcpy ;
93 : malloc-string ( string encoding -- alien )
94 string>alien malloc-byte-array ;
96 M: memory-stream stream-read
98 [ index>> ] [ alien>> ] bi <displaced-alien>
99 swap memory>byte-array
100 ] [ [ + ] change-index drop ] 2bi ;
102 M: value-type c-type-rep drop int-rep ;
104 M: value-type c-type-getter
105 drop [ swap <displaced-alien> ] ;
107 M: value-type c-type-copier
108 heap-size '[ _ memory>byte-array ] ;
110 M: value-type c-type-setter
111 [ c-type-getter ] [ heap-size ] bi '[ @ swap _ memcpy ] ;
113 M: array c-type-boxer-quot
114 unclip [ array-length ] dip [ <c-direct-array> ] 2curry ;
116 M: array c-type-unboxer-quot drop [ >c-ptr ] ;
118 ERROR: local-allocation-error ;
122 : (local-allot) ( size align -- alien ) local-allocation-error ;
124 : (cleanup-allot) ( -- )
125 ! Inhibit TCO in order for the last word in the quotation
126 ! to still be abl to access scope-allocated data.
129 MACRO: (simple-local-allot) ( c-type -- quot )
130 [ depends-on-c-type ]
131 [ dup '[ _ heap-size _ c-type-align (local-allot) ] ] bi ;
133 : [hairy-local-allot] ( c-type initial -- quot )
134 over '[ _ (simple-local-allot) _ over 0 _ set-alien-value ] ;
136 : hairy-local-allot? ( obj -- ? )
140 [ second initial: eq? ]
143 MACRO: (hairy-local-allot) ( obj -- quot )
144 dup hairy-local-allot?
145 [ first3 nip [hairy-local-allot] ]
146 [ '[ _ (simple-local-allot) ] ]
149 MACRO: (local-allots) ( c-types -- quot )
150 [ '[ _ (hairy-local-allot) ] ] map [ ] join ;
152 MACRO: box-values ( c-types -- quot )
153 [ c-type-boxer-quot ] map '[ _ spread ] ;
155 MACRO: out-parameters ( c-types -- quot )
156 [ dup hairy-local-allot? [ first ] when ] map
157 [ length ] [ [ '[ 0 _ alien-copy-value ] ] map ] bi
158 '[ _ nkeep _ spread ] ;
162 : with-scoped-allocation ( c-types quot -- )
163 [ [ (local-allots) ] [ box-values ] bi ] dip call
164 (cleanup-allot) ; inline
166 : with-out-parameters ( c-types quot -- values... )
167 [ drop (local-allots) ] [ swap out-parameters ] 2bi
168 (cleanup-allot) ; inline
170 GENERIC: binary-zero? ( value -- ? )
172 M: object binary-zero? drop f ; inline
173 M: f binary-zero? drop t ; inline
174 M: integer binary-zero? zero? ; inline
175 M: math:float binary-zero? double>bits zero? ; inline
176 M: complex binary-zero? >rect [ binary-zero? ] both? ; inline