1 ! Copyright (C) 2010, 2011 Joe Groff, Daniel Ehrenberg,
2 ! John Benediktsson, Slava Pestov.
3 ! See https://factorcode.org/license.txt for BSD license
5 DEFER: struct-slots ! for stack-checker
6 DEFER: struct-class? ! for stack-checker
7 DEFER: <struct-boa> ! for stack-checker
8 USING: accessors alien alien.c-types alien.data alien.parser
9 arrays assocs byte-arrays classes classes.parser classes.private
10 classes.struct.bit-accessors classes.tuple classes.tuple.parser
11 classes.tuple.private combinators combinators.short-circuit
12 combinators.smart cpu.architecture definitions delegate.private
13 effects functors.backend generalizations generic generic.parser
14 io kernel kernel.private lexer libc math math.order parser
15 quotations sequences sequences.private slots slots.private
16 specialized-arrays stack-checker.dependencies summary vectors
17 vocabs.loader vocabs.parser words ;
19 SPECIALIZED-ARRAY: uchar
21 ERROR: struct-must-have-slots ;
23 M: struct-must-have-slots summary
24 drop "Struct definitions must have slots" ;
27 { (underlying) c-ptr read-only } ;
29 ! We hijack the core slots vocab's slot-spec type for struct
30 ! fields. Note that 'offset' is in bits, not bytes, to support
32 TUPLE: struct-slot-spec < slot-spec
35 ! For a struct-bit-slot-spec, offset is in bits, not bytes
36 TUPLE: struct-bit-slot-spec < struct-slot-spec
39 PREDICATE: struct-class < tuple-class
40 superclass-of \ struct eq? ;
44 : struct-slots ( struct-class -- slots )
45 "c-type" word-prop fields>> ;
47 M: struct-class group-words
48 struct-slots slot-group-words ;
52 2 slot { c-ptr } declare ; inline
54 : struct-prototype ( class -- prototype ) "prototype" word-prop ; foldable
56 : memory>struct ( ptr class -- struct )
57 ! This is sub-optimal if the class is not literal, but gets
58 ! optimized down to efficient code if it is.
59 struct-class check-instance
60 M\ tuple-class boa execute( ptr class -- struct ) ;
62 : read-struct ( class -- struct )
63 [ heap-size read ] [ memory>struct ] bi ;
67 : init-struct ( class with-prototype: ( prototype -- alien ) sans-prototype: ( class -- alien ) -- alien )
68 '[ dup struct-prototype _ _ ?if-old ] keep memory>struct ; inline
72 : (malloc-struct) ( class -- struct )
73 [ heap-size malloc ] keep memory>struct ; inline
75 : malloc-struct ( class -- struct )
76 [ >c-ptr malloc-byte-array ] [ 1 swap heap-size calloc ] init-struct ; inline
78 : (struct) ( class -- struct )
79 [ heap-size (byte-array) ] keep memory>struct ; inline
81 : <struct> ( class -- struct )
82 [ >c-ptr clone ] [ heap-size <byte-array> ] init-struct ; inline
86 : pad-struct-slots ( values class -- values' class )
87 [ struct-slots [ initial>> ] map over length tail append ] keep ;
89 : sign-extend ( n bits -- n' )
91 ! https://guru.multimedia.cx/fast-sign-extension/
92 1 - -1 swap shift [ + ] keep bitxor ; inline
94 : sign-extender ( signed? bits -- quot )
95 '[ _ [ _ sign-extend ] when ] ;
97 GENERIC: (reader-quot) ( slot -- quot: ( struct -- value ) )
99 M: struct-slot-spec (reader-quot)
100 [ offset>> ] [ type>> ] bi '[ >c-ptr _ _ alien-value ] ;
102 M: struct-bit-slot-spec (reader-quot)
103 [ [ offset>> ] [ bits>> ] bi bit-reader ]
104 [ [ signed?>> ] [ bits>> ] bi sign-extender ]
108 GENERIC: (writer-quot) ( slot -- quot: ( value struct -- ) )
110 M: struct-slot-spec (writer-quot)
111 [ offset>> ] [ type>> ] bi '[ >c-ptr _ _ set-alien-value ] ;
113 M: struct-bit-slot-spec (writer-quot)
114 [ offset>> ] [ bits>> ] bi bit-writer [ >c-ptr ] prepose ;
116 : (boxer-quot) ( class -- quot )
117 '[ _ memory>struct ] ;
119 : (unboxer-quot) ( class -- quot )
122 MACRO: read-struct-slot ( slot -- quot: ( struct -- value ) )
123 dup type>> add-depends-on-c-type
126 MACRO: write-struct-slot ( slot -- quot: ( value struct -- ) )
127 dup type>> add-depends-on-c-type
132 MACRO: <struct-boa> ( class -- quot: ( ... -- struct ) )
134 [ length ] [ [ (writer-quot) '[ over @ ] ] map ] bi
135 '[ [ _ (struct) ] _ ndip _ spread ] ;
137 M: struct-class boa>object
138 swap pad-struct-slots
139 [ <struct> ] [ struct-slots ] bi
140 [ [ (writer-quot) call( value struct -- ) ] with 2each ] keepd ;
142 M: struct-class new <struct> ;
144 M: struct-class boa <struct-boa> ;
146 M: struct-class boa-effect
147 [ struct-slots [ name>> ] map ] [ name>> 1array ] bi <effect> ;
149 M: struct-class initial-value* <struct> t ; inline
151 ! Struct slot accessors
153 GENERIC: struct-slot-values ( struct -- sequence )
155 M: struct-class reader-quot
156 dup type>> array? [ dup type>> first define-array-vocab drop ] when
157 nip '[ _ read-struct-slot ] ;
159 M: struct-class writer-quot
160 nip '[ _ write-struct-slot ] ;
162 : offset-of ( field struct -- offset )
163 struct-slots slot-named offset>> ; inline
166 2dup [ class-of ] same? [
167 [ struct-slot-values ] same?
168 ] [ 2drop f ] if ; inline
171 nip dup >c-ptr [ struct-slot-values hashcode ] [ drop 0 ] if ; inline
175 TUPLE: struct-c-type < abstract-c-type
177 return-in-registers? ;
179 INSTANCE: struct-c-type value-type
181 M: struct-c-type lookup-c-type ;
183 M: struct-c-type base-type ;
185 : large-struct? ( type -- ? )
187 { [ dup void? ] [ drop f ] }
188 { [ dup base-type struct-c-type? not ] [ drop f ] }
189 [ return-struct-in-registers? not ]
193 : struct-slot-values-quot ( class -- quot )
195 [ name>> reader-word 1quotation ] map
196 '[ _ cleave>array ] ;
198 : define-struct-slot-values-method ( class -- )
199 [ \ struct-slot-values ] [ struct-slot-values-quot ] bi
200 define-inline-method ;
202 : forget-struct-slot-values-method ( class -- )
203 \ struct-slot-values ?lookup-method forget ;
205 : clone-underlying ( struct -- byte-array )
206 binary-object memory>byte-array ; inline
208 : define-clone-method ( class -- )
209 [ \ clone ] [ '[ clone-underlying _ memory>struct ] ] bi
210 define-inline-method ;
212 : forget-clone-method ( class -- )
213 \ clone ?lookup-method forget ;
215 :: c-type-for-class ( class slots size align -- c-type )
223 class (unboxer-quot) >>unboxer-quot
224 class (boxer-quot) >>boxer-quot ;
226 GENERIC: compute-slot-offset ( offset class -- offset' )
228 : c-type-align-at ( slot-spec offset -- n )
229 over packed?>> [ 2drop 1 ] [
231 0 = [ c-type-align-first ] [ c-type-align ] if
234 M: struct-slot-spec compute-slot-offset
235 [ over c-type-align-at 8 * align ] keep
236 [ [ 8 /i ] dip offset<< ] [ type>> heap-size 8 * + ] 2bi ;
238 M: struct-bit-slot-spec compute-slot-offset
239 [ offset<< ] [ bits>> + ] 2bi ;
241 : compute-struct-offsets ( slots -- size )
242 0 [ compute-slot-offset ] reduce 8 align 8 /i ;
244 : compute-union-offsets ( slots -- size )
245 1 [ 0 >>offset type>> heap-size max ] reduce ;
247 : struct-alignment ( slots -- align )
248 [ struct-bit-slot-spec? ] reject
249 1 [ dup offset>> c-type-align-at max ] reduce ;
253 : struct-size ( class -- n ) "struct-size" word-prop ; inline
255 M: struct byte-length class-of struct-size ; inline foldable
256 M: struct binary-zero? binary-object uchar <c-direct-array> [ 0 = ] all? ; inline
261 : struct-needs-prototype? ( class -- ? )
262 struct-slots [ initial>> binary-zero? ] all? not ;
264 : make-struct-prototype ( class -- prototype )
265 dup struct-needs-prototype? [
266 [ "c-type" word-prop size>> <byte-array> ]
272 over [ swapd [ call( value struct -- ) ] keepd ] [ 2drop ] if
276 : define-struct-methods ( class -- )
277 [ define-struct-slot-values-method ] [ define-clone-method ] bi ;
279 : check-struct-slots ( slots -- )
280 [ type>> lookup-c-type drop ] each ;
282 : redefine-struct-tuple-class ( class -- )
283 [ struct f redefine-tuple-class ] [ make-final ] bi ;
285 : resize-underlying ( struct -- )
286 [ 2 slot dup byte-array? ]
287 [ class-of "struct-size" word-prop '[ _ swap resize ] [ drop f ] if ]
290 M: struct update-tuple
291 ! make sure underlying byte-array is correct size, but maybe
292 ! has incorrect contents... is there something better to do?
293 [ resize-underlying ] [ call-next-method ] bi ;
295 : forget-struct-slot-accessors ( class -- )
296 dup "c-type" word-prop [
298 fields>> forget-slot-accessors
302 :: (define-struct-class) ( class slot-specs offsets-quot alignment-quot -- )
303 slot-specs check-struct-slots
304 slot-specs empty? [ struct-must-have-slots ] when
305 class redefine-struct-tuple-class
306 slot-specs offsets-quot call :> unaligned-size
307 slot-specs alignment-quot call :> alignment
308 unaligned-size alignment align :> size
310 class slot-specs size alignment c-type-for-class :> c-type
312 class forget-struct-slot-accessors
315 class slot-specs define-accessors
316 class size "struct-size" set-word-prop
317 class dup make-struct-prototype "prototype" set-word-prop
318 class define-struct-methods ; inline
320 : make-packed-slots ( slots -- slot-specs )
321 make-slots [ t >>packed? ] map! ;
325 : define-struct-class ( class slots -- )
327 [ compute-struct-offsets ] [ struct-alignment ]
328 (define-struct-class) ;
330 : define-packed-struct-class ( class slots -- )
332 [ compute-struct-offsets ] [ drop 1 ]
333 (define-struct-class) ;
335 : define-union-struct-class ( class slots -- )
337 [ compute-union-offsets ] [ struct-alignment ]
338 (define-struct-class) ;
340 ERROR: invalid-struct-slot token ;
342 : struct-slot-class ( c-type -- class' )
343 lookup-c-type c-type-boxed-class
344 dup \ byte-array = [ drop \ c-ptr ] when ;
346 M: struct-class reset-class
348 [ \ <struct-boa> def>> first delete-at ]
349 [ forget-struct-slot-accessors ]
350 [ forget-struct-slot-values-method ]
351 [ forget-clone-method ]
352 [ { "c-type" "layout" "struct-size" } remove-word-props ]
360 :: set-bits ( slot-spec n -- slot-spec )
361 struct-bit-slot-spec new
363 slot-spec type>> c-type-signed >>signed?
364 slot-spec name>> >>name
365 slot-spec class>> >>class
366 slot-spec type>> >>type
367 slot-spec read-only>> >>read-only
368 slot-spec initial>> >>initial ;
370 : peel-off-struct-attributes ( slot-spec array -- slot-spec array )
373 { initial: [ [ first >>initial ] [ rest ] bi ] }
374 { read-only [ [ t >>read-only ] dip ] }
375 { bits: [ [ first set-bits ] [ rest ] bi ] }
376 [ bad-slot-attribute ]
382 : <struct-slot-spec> ( name c-type attributes -- slot-spec )
383 [ struct-slot-spec new ] 3dip
385 [ [ >>type ] [ struct-slot-class init-slot-class ] bi ]
386 [ [ dup empty? ] [ peel-off-struct-attributes ] until drop ] tri* ;
389 : parse-struct-slot ( -- slot )
390 scan-token scan-c-type \ } parse-until <struct-slot-spec> ;
392 : parse-struct-slots ( slots -- slots' more? )
395 { "{" [ parse-struct-slot suffix! t ] }
396 [ invalid-struct-slot ]
399 : parse-struct-definition ( -- class slots )
400 scan-new-class 8 <vector> [ parse-struct-slots ] [ ] while >array
401 dup [ name>> ] map check-duplicate-slots ;
405 parse-struct-definition define-struct-class ;
407 SYNTAX: PACKED-STRUCT:
408 parse-struct-definition define-packed-struct-class ;
410 SYNTAX: UNION-STRUCT:
411 parse-struct-definition define-union-struct-class ;
414 scan-word dup struct-slots parse-tuple-literal-slots suffix! ;
417 scan-word scan-object swap memory>struct suffix! ;
422 : scan-c-type* ( -- c-type/param )
423 scan-token dup "{" = [ drop \ } parse-until >array ] [ search ] if ;
425 : parse-struct-slot* ( accum -- accum )
426 scan-string-param scan-c-type* \ } parse-until
427 [ <struct-slot-spec> suffix! ] 3curry append! ;
429 : parse-struct-slots* ( accum -- accum more? )
432 { "{" [ parse-struct-slot* t ] }
433 [ invalid-struct-slot ]
438 FUNCTOR-SYNTAX: STRUCT:
440 [ 8 <vector> ] append!
441 [ parse-struct-slots* ] [ ] while
442 [ >array define-struct-class ] append! ;
444 { "classes.struct" "prettyprint" } "classes.struct.prettyprint" require-when