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14f1d9fe MD |
1 | ;;; installed-scm-file |
2 | ||
4247d8e3 | 3 | ;;;; Copyright (C) 1998,1999,2000-2003,2006,2009-2011,2013-2015 Free Software Foundation, Inc. |
4ff2133a LC |
4 | ;;;; Copyright (C) 1993-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr> |
5 | ;;;; | |
73be1d9e MV |
6 | ;;;; This library is free software; you can redistribute it and/or |
7 | ;;;; modify it under the terms of the GNU Lesser General Public | |
8 | ;;;; License as published by the Free Software Foundation; either | |
53befeb7 | 9 | ;;;; version 3 of the License, or (at your option) any later version. |
4ff2133a | 10 | ;;;; |
73be1d9e | 11 | ;;;; This library is distributed in the hope that it will be useful, |
14f1d9fe | 12 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
13 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | ;;;; Lesser General Public License for more details. | |
4ff2133a | 15 | ;;;; |
73be1d9e MV |
16 | ;;;; You should have received a copy of the GNU Lesser General Public |
17 | ;;;; License along with this library; if not, write to the Free Software | |
92205699 | 18 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
4ff2133a | 19 | ;;;; |
14f1d9fe MD |
20 | \f |
21 | ||
14f1d9fe | 22 | ;;;; |
4ff2133a LC |
23 | ;;;; This file was based upon stklos.stk from the STk distribution |
24 | ;;;; version 4.0.1 by Erick Gallesio <eg@unice.fr>. | |
14f1d9fe MD |
25 | ;;;; |
26 | ||
27 | (define-module (oop goops) | |
28d0871b | 28 | #:use-module (srfi srfi-1) |
51fd1cd6 | 29 | #:use-module (ice-9 match) |
e0590e7c AW |
30 | #:use-module (oop goops util) |
31 | #:use-module (system base target) | |
28d0871b AW |
32 | #:export-syntax (define-class class standard-define-class |
33 | define-generic define-accessor define-method | |
34 | define-extended-generic define-extended-generics | |
35 | method) | |
36 | #:export ( ;; The root of everything. | |
37 | <top> | |
38 | <class> <object> | |
39 | ||
40 | ;; Slot types. | |
41 | <foreign-slot> <protected-slot> <hidden-slot> <opaque-slot> | |
42 | <read-only-slot> <self-slot> <protected-opaque-slot> | |
43 | <protected-hidden-slot> <protected-read-only-slot> | |
44 | <scm-slot> <int-slot> <float-slot> <double-slot> | |
45 | ||
46 | ;; Methods are implementations of generic functions. | |
f67f8581 LC |
47 | <method> <accessor-method> |
48 | ||
28d0871b AW |
49 | ;; Applicable objects, either procedures or applicable structs. |
50 | <procedure-class> <applicable> | |
51 | <procedure> <primitive-generic> | |
f67f8581 | 52 | |
28d0871b | 53 | ;; Applicable structs. |
6c7dd9eb AW |
54 | <applicable-struct-class> <applicable-struct-with-setter-class> |
55 | <applicable-struct> <applicable-struct-with-setter> | |
28d0871b AW |
56 | <generic> <extended-generic> |
57 | <generic-with-setter> <extended-generic-with-setter> | |
58 | <accessor> <extended-accessor> | |
59 | ||
60 | ;; Types with their own allocated typecodes. | |
61 | <boolean> <char> <list> <pair> <null> <string> <symbol> | |
62 | <vector> <bytevector> <uvec> <foreign> <hashtable> | |
c0a1a0b1 | 63 | <fluid> <dynamic-state> <frame> <vm> <vm-continuation> |
e2fafeb9 | 64 | <keyword> |
28d0871b AW |
65 | |
66 | ;; Numbers. | |
67 | <number> <complex> <real> <integer> <fraction> | |
68 | ||
69 | ;; Unknown. | |
70 | <unknown> | |
71 | ||
72 | ;; Particular SMOB data types. All SMOB types have | |
73 | ;; corresponding classes, which may be obtained via class-of, | |
74 | ;; once you have an instance. Perhaps FIXME to provide a | |
75 | ;; smob-type-name->class procedure. | |
76 | <arbiter> <promise> <thread> <mutex> <condition-variable> | |
77 | <regexp> <hook> <bitvector> <random-state> <async> | |
e2fafeb9 | 78 | <directory> <array> <character-set> |
02620dd9 | 79 | <dynamic-object> <guardian> <macro> |
28d0871b AW |
80 | |
81 | ;; Modules. | |
82 | <module> | |
83 | ||
84 | ;; Ports. | |
85 | <port> <input-port> <output-port> <input-output-port> | |
86 | ||
87 | ;; Like SMOB types, all port types have their own classes, | |
88 | ;; which can be accessed via `class-of' once you have an | |
89 | ;; instance. Here we export bindings just for file ports. | |
90 | <file-port> | |
91 | <file-input-port> <file-output-port> <file-input-output-port> | |
92 | ||
93 | is-a? class-of | |
94 | ensure-metaclass ensure-metaclass-with-supers | |
95 | make-class | |
96 | make-generic ensure-generic | |
97 | make-extended-generic | |
98 | make-accessor ensure-accessor | |
99 | add-method! | |
100 | class-slot-ref class-slot-set! slot-unbound slot-missing | |
101 | slot-definition-name slot-definition-options | |
102 | slot-definition-allocation | |
103 | ||
104 | slot-definition-getter slot-definition-setter | |
105 | slot-definition-accessor | |
106 | slot-definition-init-value slot-definition-init-form | |
107 | slot-definition-init-thunk slot-definition-init-keyword | |
108 | slot-init-function class-slot-definition | |
109 | method-source | |
110 | compute-cpl compute-std-cpl compute-get-n-set compute-slots | |
111 | compute-getter-method compute-setter-method | |
112 | allocate-instance initialize make-instance make | |
113 | no-next-method no-applicable-method no-method | |
114 | change-class update-instance-for-different-class | |
115 | shallow-clone deep-clone | |
116 | class-redefinition | |
117 | apply-generic apply-method apply-methods | |
118 | compute-applicable-methods %compute-applicable-methods | |
119 | method-more-specific? sort-applicable-methods | |
120 | class-subclasses class-methods | |
121 | goops-error | |
122 | min-fixnum max-fixnum | |
123 | ||
124 | ;;; *fixme* Should go into goops.c | |
125 | instance? slot-ref-using-class | |
126 | slot-set-using-class! slot-bound-using-class? | |
127 | slot-exists-using-class? slot-ref slot-set! slot-bound? | |
128 | class-name class-direct-supers class-direct-subclasses | |
129 | class-direct-methods class-direct-slots class-precedence-list | |
130 | class-slots | |
131 | generic-function-name | |
132 | generic-function-methods method-generic-function | |
133 | method-specializers method-formals | |
134 | primitive-generic-generic enable-primitive-generic! | |
135 | method-procedure accessor-method-slot-definition | |
136 | slot-exists? make find-method get-keyword) | |
137 | #:no-backtrace) | |
78ec533c | 138 | |
5bc7c6db MW |
139 | ;; XXX FIXME: figure out why the 'eval-when's in this file must use |
140 | ;; 'compile' and must avoid 'expand', but only in 2.2, and only when | |
141 | ;; compiling something that imports goops, e.g. (ice-9 occam-channel), | |
142 | ;; before (oop goops) itself has been compiled. | |
143 | ||
78ec533c | 144 | ;; First initialize the builtin part of GOOPS |
5bc7c6db | 145 | (eval-when (compile load eval) |
6ab19396 AW |
146 | (load-extension (string-append "libguile-" (effective-version)) |
147 | "scm_init_goops_builtins")) | |
78ec533c | 148 | |
5bc7c6db | 149 | (eval-when (compile load eval) |
aec4a84a | 150 | (use-modules ((language tree-il primitives) :select (add-interesting-primitive!))) |
4d6a7ac6 | 151 | (add-interesting-primitive! 'class-of)) |
aec4a84a | 152 | |
e0590e7c AW |
153 | ;;; The standard class precedence list computation algorithm |
154 | ;;; | |
155 | ;;; Correct behaviour: | |
156 | ;;; | |
157 | ;;; (define-class food ()) | |
158 | ;;; (define-class fruit (food)) | |
159 | ;;; (define-class spice (food)) | |
160 | ;;; (define-class apple (fruit)) | |
161 | ;;; (define-class cinnamon (spice)) | |
162 | ;;; (define-class pie (apple cinnamon)) | |
163 | ;;; => cpl (pie) = pie apple fruit cinnamon spice food object top | |
164 | ;;; | |
165 | ;;; (define-class d ()) | |
166 | ;;; (define-class e ()) | |
167 | ;;; (define-class f ()) | |
168 | ;;; (define-class b (d e)) | |
169 | ;;; (define-class c (e f)) | |
170 | ;;; (define-class a (b c)) | |
171 | ;;; => cpl (a) = a b d c e f object top | |
172 | ;;; | |
173 | ||
174 | (define (compute-std-cpl c get-direct-supers) | |
175 | (define (only-non-null lst) | |
176 | (filter (lambda (l) (not (null? l))) lst)) | |
177 | ||
178 | (define (merge-lists reversed-partial-result inputs) | |
179 | (cond | |
180 | ((every null? inputs) | |
181 | (reverse! reversed-partial-result)) | |
182 | (else | |
183 | (let* ((candidate (lambda (c) | |
184 | (and (not (any (lambda (l) | |
185 | (memq c (cdr l))) | |
186 | inputs)) | |
187 | c))) | |
188 | (candidate-car (lambda (l) | |
189 | (and (not (null? l)) | |
190 | (candidate (car l))))) | |
191 | (next (any candidate-car inputs))) | |
192 | (if (not next) | |
193 | (goops-error "merge-lists: Inconsistent precedence graph")) | |
194 | (let ((remove-next (lambda (l) | |
195 | (if (eq? (car l) next) | |
196 | (cdr l) | |
197 | l)))) | |
198 | (merge-lists (cons next reversed-partial-result) | |
199 | (only-non-null (map remove-next inputs)))))))) | |
200 | (let ((c-direct-supers (get-direct-supers c))) | |
201 | (merge-lists (list c) | |
202 | (only-non-null (append (map class-precedence-list | |
203 | c-direct-supers) | |
204 | (list c-direct-supers)))))) | |
205 | ||
206 | ;; Bootstrap version. | |
207 | (define (compute-cpl class) | |
208 | (compute-std-cpl class class-direct-supers)) | |
209 | ||
51fd1cd6 AW |
210 | ;; During boot, the specialized slot classes aren't defined yet, so we |
211 | ;; initialize <class> with unspecialized slots. | |
212 | (define-syntax-rule (build-<class>-slots specialized?) | |
213 | (let-syntax ((unspecialized-slot (syntax-rules () | |
214 | ((_ name) (list 'name)))) | |
215 | (specialized-slot (syntax-rules () | |
216 | ((_ name class) | |
217 | (if specialized? | |
218 | (list 'name #:class class) | |
219 | (list 'name)))))) | |
220 | (list (specialized-slot layout <protected-read-only-slot>) | |
221 | (specialized-slot flags <hidden-slot>) | |
222 | (specialized-slot self <self-slot>) | |
223 | (specialized-slot instance-finalizer <hidden-slot>) | |
224 | (unspecialized-slot print) | |
225 | (specialized-slot name <protected-hidden-slot>) | |
226 | (specialized-slot reserved-0 <hidden-slot>) | |
227 | (specialized-slot reserved-1 <hidden-slot>) | |
228 | (unspecialized-slot redefined) | |
229 | (specialized-slot h0 <int-slot>) | |
230 | (specialized-slot h1 <int-slot>) | |
231 | (specialized-slot h2 <int-slot>) | |
232 | (specialized-slot h3 <int-slot>) | |
233 | (specialized-slot h4 <int-slot>) | |
234 | (specialized-slot h5 <int-slot>) | |
235 | (specialized-slot h6 <int-slot>) | |
236 | (specialized-slot h7 <int-slot>) | |
237 | (unspecialized-slot direct-supers) | |
238 | (unspecialized-slot direct-slots) | |
239 | (unspecialized-slot direct-subclasses) | |
240 | (unspecialized-slot direct-methods) | |
241 | (unspecialized-slot cpl) | |
51fd1cd6 AW |
242 | (unspecialized-slot slots) |
243 | (unspecialized-slot getters-n-setters) | |
244 | (unspecialized-slot nfields)))) | |
245 | ||
e0590e7c AW |
246 | (define (build-slots-list dslots cpl) |
247 | (define (check-cpl slots class-slots) | |
248 | (when (or-map (lambda (slot-def) (assq (car slot-def) slots)) | |
249 | class-slots) | |
250 | (scm-error 'misc-error #f | |
251 | "a predefined <class> inherited field cannot be redefined" | |
252 | '() '()))) | |
253 | (define (remove-duplicate-slots slots) | |
254 | (let lp ((slots (reverse slots)) (res '()) (seen '())) | |
51fd1cd6 | 255 | (cond |
e0590e7c AW |
256 | ((null? slots) res) |
257 | ((memq (caar slots) seen) | |
258 | (lp (cdr slots) res seen)) | |
259 | (else | |
260 | (lp (cdr slots) (cons (car slots) res) (cons (caar slots) seen)))))) | |
261 | (let* ((class-slots (and (memq <class> cpl) (slot-ref <class> 'slots)))) | |
262 | (when class-slots | |
263 | (check-cpl dslots class-slots)) | |
264 | (let lp ((cpl (cdr cpl)) (res dslots) (class-slots '())) | |
265 | (if (null? cpl) | |
266 | (remove-duplicate-slots (append class-slots res)) | |
267 | (let* ((head (car cpl)) | |
268 | (cpl (cdr cpl)) | |
269 | (new-slots (slot-ref head 'direct-slots))) | |
270 | (cond | |
271 | ((not class-slots) | |
272 | (lp cpl (append new-slots res) class-slots)) | |
273 | ((eq? head <class>) | |
274 | ;; Move class slots to the head of the list. | |
275 | (lp cpl res new-slots)) | |
276 | (else | |
277 | (check-cpl new-slots class-slots) | |
278 | (lp cpl (append new-slots res) class-slots)))))))) | |
51fd1cd6 | 279 | |
e0590e7c AW |
280 | (define (%compute-getters-n-setters slots) |
281 | (define (compute-init-thunk options) | |
282 | (cond | |
283 | ((kw-arg-ref options #:init-value) => (lambda (val) (lambda () val))) | |
284 | ((kw-arg-ref options #:init-thunk)) | |
285 | (else #f))) | |
286 | (let lp ((slots slots) (n 0)) | |
287 | (match slots | |
288 | (() '()) | |
289 | (((name . options) . slots) | |
290 | (cons (cons name (cons (compute-init-thunk options) n)) | |
291 | (lp slots (1+ n))))))) | |
292 | ||
293 | (define (%compute-layout slots getters-n-setters nfields is-class?) | |
294 | (define (instance-allocated? g-n-s) | |
295 | (match g-n-s | |
296 | ((name init-thunk . (? exact-integer? index)) #t) | |
297 | ((name init-thunk getter setter index size) #t) | |
298 | (_ #f))) | |
299 | ||
300 | (define (allocated-index g-n-s) | |
301 | (match g-n-s | |
302 | ((name init-thunk . (? exact-integer? index)) index) | |
303 | ((name init-thunk getter setter index size) index))) | |
304 | ||
305 | (define (allocated-size g-n-s) | |
306 | (match g-n-s | |
307 | ((name init-thunk . (? exact-integer? index)) 1) | |
308 | ((name init-thunk getter setter index size) size))) | |
309 | ||
310 | (define (slot-protection-and-kind options) | |
311 | (define (subclass? class parent) | |
312 | (memq parent (class-precedence-list class))) | |
313 | (let ((type (kw-arg-ref options #:class))) | |
314 | (if (and type (subclass? type <foreign-slot>)) | |
315 | (values (cond | |
316 | ((subclass? type <self-slot>) #\s) | |
317 | ((subclass? type <protected-slot>) #\p) | |
318 | (else #\u)) | |
319 | (cond | |
320 | ((subclass? type <opaque-slot>) #\o) | |
321 | ((subclass? type <read-only-slot>) #\r) | |
322 | ((subclass? type <hidden-slot>) #\h) | |
323 | (else #\w))) | |
324 | (values #\p #\w)))) | |
325 | ||
326 | (let ((layout (make-string (* nfields 2)))) | |
327 | (let lp ((n 0) (slots slots) (getters-n-setters getters-n-setters)) | |
328 | (match getters-n-setters | |
329 | (() | |
330 | (unless (= n nfields) (error "bad nfields")) | |
331 | (unless (null? slots) (error "inconsistent g-n-s/slots")) | |
332 | (when is-class? | |
333 | (let ((class-layout (symbol->string (slot-ref <class> 'layout)))) | |
334 | (unless (string-prefix? class-layout layout) | |
335 | (error "bad layout for class")))) | |
336 | layout) | |
337 | ((g-n-s . getters-n-setters) | |
338 | (match slots | |
339 | (((name . options) . slots) | |
340 | (cond | |
341 | ((instance-allocated? g-n-s) | |
342 | (unless (< n nfields) (error "bad nfields")) | |
343 | (unless (= n (allocated-index g-n-s)) (error "bad allocation")) | |
344 | (call-with-values (lambda () (slot-protection-and-kind options)) | |
345 | (lambda (protection kind) | |
346 | (let init ((n n) (size (allocated-size g-n-s))) | |
51fd1cd6 | 347 | (cond |
e0590e7c AW |
348 | ((zero? size) (lp n slots getters-n-setters)) |
349 | (else | |
350 | (string-set! layout (* n 2) protection) | |
351 | (string-set! layout (1+ (* n 2)) kind) | |
352 | (init (1+ n) (1- size)))))))) | |
353 | (else | |
354 | (lp n slots getters-n-setters)))))))))) | |
355 | ||
356 | (define (%prep-layout! class) | |
357 | (let* ((is-class? (and (memq <class> (slot-ref class 'cpl)) #t)) | |
358 | (layout (%compute-layout (slot-ref class 'slots) | |
359 | (slot-ref class 'getters-n-setters) | |
360 | (slot-ref class 'nfields) | |
361 | is-class?))) | |
362 | (%init-layout! class layout))) | |
363 | ||
364 | (define (make-standard-class class name dsupers dslots) | |
365 | (let ((z (make-struct/no-tail class))) | |
366 | (slot-set! z 'direct-supers dsupers) | |
367 | (let* ((cpl (compute-cpl z)) | |
368 | (dslots (map (lambda (slot) | |
369 | (if (pair? slot) slot (list slot))) | |
370 | dslots)) | |
371 | (slots (build-slots-list dslots cpl)) | |
372 | (nfields (length slots)) | |
373 | (g-n-s (%compute-getters-n-setters slots))) | |
374 | (slot-set! z 'name name) | |
375 | (slot-set! z 'direct-slots dslots) | |
376 | (slot-set! z 'direct-subclasses '()) | |
377 | (slot-set! z 'direct-methods '()) | |
378 | (slot-set! z 'cpl cpl) | |
379 | (slot-set! z 'slots slots) | |
380 | (slot-set! z 'nfields nfields) | |
381 | (slot-set! z 'getters-n-setters g-n-s) | |
382 | (slot-set! z 'redefined #f) | |
383 | (for-each (lambda (super) | |
384 | (let ((subclasses (slot-ref super 'direct-subclasses))) | |
385 | (slot-set! super 'direct-subclasses (cons z subclasses)))) | |
386 | dsupers) | |
387 | (%prep-layout! z) | |
388 | (%inherit-magic! z dsupers) | |
389 | z))) | |
390 | ||
391 | (define <class> | |
392 | (let ((dslots (build-<class>-slots #f))) | |
393 | (%make-root-class '<class> dslots (%compute-getters-n-setters dslots)))) | |
394 | ||
395 | (define-syntax define-standard-class | |
396 | (syntax-rules () | |
397 | ((define-standard-class name (super ...) #:metaclass meta slot ...) | |
398 | (define name | |
399 | (make-standard-class meta 'name (list super ...) '(slot ...)))) | |
400 | ((define-standard-class name (super ...) slot ...) | |
401 | (define-standard-class name (super ...) #:metaclass <class> slot ...)))) | |
402 | ||
403 | (define-standard-class <top> ()) | |
404 | (define-standard-class <object> (<top>)) | |
405 | ||
406 | ;; <top>, <object>, and <class> were partially initialized. Correct | |
407 | ;; them here. | |
408 | (slot-set! <object> 'direct-subclasses (list <class>)) | |
409 | (slot-set! <class> 'direct-supers (list <object>)) | |
410 | (slot-set! <class> 'cpl (list <class> <object> <top>)) | |
411 | ||
412 | (define-standard-class <foreign-slot> (<top>)) | |
413 | (define-standard-class <protected-slot> (<foreign-slot>)) | |
414 | (define-standard-class <hidden-slot> (<foreign-slot>)) | |
415 | (define-standard-class <opaque-slot> (<foreign-slot>)) | |
416 | (define-standard-class <read-only-slot> (<foreign-slot>)) | |
417 | (define-standard-class <self-slot> (<read-only-slot>)) | |
418 | (define-standard-class <protected-opaque-slot> (<protected-slot> | |
419 | <opaque-slot>)) | |
420 | (define-standard-class <protected-hidden-slot> (<protected-slot> | |
421 | <hidden-slot>)) | |
422 | (define-standard-class <protected-read-only-slot> (<protected-slot> | |
423 | <read-only-slot>)) | |
424 | (define-standard-class <scm-slot> (<protected-slot>)) | |
425 | (define-standard-class <int-slot> (<foreign-slot>)) | |
426 | (define-standard-class <float-slot> (<foreign-slot>)) | |
427 | (define-standard-class <double-slot> (<foreign-slot>)) | |
428 | ||
429 | ;; Finish initialization of <class>. | |
430 | (let ((dslots (build-<class>-slots #t))) | |
431 | (slot-set! <class> 'direct-slots dslots) | |
432 | (slot-set! <class> 'slots dslots) | |
433 | (slot-set! <class> 'getters-n-setters (%compute-getters-n-setters dslots))) | |
434 | ||
435 | ;; Applicables and their classes. | |
436 | (define-standard-class <procedure-class> (<class>)) | |
6c7dd9eb AW |
437 | (define-standard-class <applicable-struct-class> |
438 | (<procedure-class>)) | |
439 | (define-standard-class <applicable-struct-with-setter-class> | |
440 | (<applicable-struct-class>)) | |
441 | (%bless-applicable-struct-vtables! <applicable-struct-class> | |
442 | <applicable-struct-with-setter-class>) | |
443 | ||
e0590e7c AW |
444 | (define-standard-class <applicable> (<top>)) |
445 | (define-standard-class <applicable-struct> (<object> <applicable>) | |
446 | #:metaclass <applicable-struct-class> | |
447 | procedure) | |
6c7dd9eb AW |
448 | (define-standard-class <applicable-struct-with-setter> (<applicable-struct>) |
449 | #:metaclass <applicable-struct-with-setter-class> | |
450 | setter) | |
e0590e7c AW |
451 | (define-standard-class <generic> (<applicable-struct>) |
452 | #:metaclass <applicable-struct-class> | |
453 | methods | |
454 | (n-specialized #:init-value 0) | |
455 | (extended-by #:init-value ()) | |
456 | effective-methods) | |
457 | (%bless-pure-generic-vtable! <generic>) | |
458 | (define-standard-class <extended-generic> (<generic>) | |
459 | #:metaclass <applicable-struct-class> | |
460 | (extends #:init-value ())) | |
461 | (%bless-pure-generic-vtable! <extended-generic>) | |
6c7dd9eb AW |
462 | (define-standard-class <generic-with-setter> (<generic> |
463 | <applicable-struct-with-setter>) | |
464 | #:metaclass <applicable-struct-with-setter-class>) | |
e0590e7c AW |
465 | (%bless-pure-generic-vtable! <generic-with-setter>) |
466 | (define-standard-class <accessor> (<generic-with-setter>) | |
6c7dd9eb | 467 | #:metaclass <applicable-struct-with-setter-class>) |
e0590e7c AW |
468 | (%bless-pure-generic-vtable! <accessor>) |
469 | (define-standard-class <extended-generic-with-setter> (<extended-generic> | |
470 | <generic-with-setter>) | |
6c7dd9eb | 471 | #:metaclass <applicable-struct-with-setter-class>) |
e0590e7c AW |
472 | (%bless-pure-generic-vtable! <extended-generic-with-setter>) |
473 | (define-standard-class <extended-accessor> (<accessor> | |
474 | <extended-generic-with-setter>) | |
6c7dd9eb | 475 | #:metaclass <applicable-struct-with-setter-class>) |
e0590e7c AW |
476 | (%bless-pure-generic-vtable! <extended-accessor>) |
477 | ||
6c7dd9eb AW |
478 | ;; Methods |
479 | (define-standard-class <method> (<object>) | |
480 | generic-function | |
481 | specializers | |
482 | procedure | |
483 | formals | |
484 | body | |
485 | make-procedure) | |
486 | (define-standard-class <accessor-method> (<method>) | |
487 | (slot-definition #:init-keyword #:slot-definition)) | |
488 | ||
e0590e7c AW |
489 | ;; Primitive types classes |
490 | (define-standard-class <boolean> (<top>)) | |
491 | (define-standard-class <char> (<top>)) | |
492 | (define-standard-class <list> (<top>)) | |
493 | (define-standard-class <pair> (<list>)) | |
494 | (define-standard-class <null> (<list>)) | |
495 | (define-standard-class <string> (<top>)) | |
496 | (define-standard-class <symbol> (<top>)) | |
497 | (define-standard-class <vector> (<top>)) | |
498 | (define-standard-class <foreign> (<top>)) | |
499 | (define-standard-class <hashtable> (<top>)) | |
500 | (define-standard-class <fluid> (<top>)) | |
501 | (define-standard-class <dynamic-state> (<top>)) | |
502 | (define-standard-class <frame> (<top>)) | |
503 | (define-standard-class <vm-continuation> (<top>)) | |
504 | (define-standard-class <bytevector> (<top>)) | |
505 | (define-standard-class <uvec> (<bytevector>)) | |
506 | (define-standard-class <array> (<top>)) | |
507 | (define-standard-class <bitvector> (<top>)) | |
508 | (define-standard-class <number> (<top>)) | |
509 | (define-standard-class <complex> (<number>)) | |
510 | (define-standard-class <real> (<complex>)) | |
511 | (define-standard-class <integer> (<real>)) | |
512 | (define-standard-class <fraction> (<real>)) | |
513 | (define-standard-class <keyword> (<top>)) | |
514 | (define-standard-class <unknown> (<top>)) | |
515 | (define-standard-class <procedure> (<applicable>) | |
516 | #:metaclass <procedure-class>) | |
517 | (define-standard-class <primitive-generic> (<procedure>) | |
518 | #:metaclass <procedure-class>) | |
519 | (define-standard-class <port> (<top>)) | |
520 | (define-standard-class <input-port> (<port>)) | |
521 | (define-standard-class <output-port> (<port>)) | |
522 | (define-standard-class <input-output-port> (<input-port> <output-port>)) | |
523 | ||
524 | (define (%invalidate-method-cache! gf) | |
525 | (slot-set! gf 'procedure (delayed-compile gf)) | |
526 | (slot-set! gf 'effective-methods '())) | |
527 | ||
528 | ;; Boot definition. | |
529 | (define (invalidate-method-cache! gf) | |
530 | (%invalidate-method-cache! gf)) | |
531 | ||
532 | ;; A simple make which will be redefined later. This version handles | |
533 | ;; only creation of gf, methods and classes (no instances). | |
534 | ;; | |
535 | ;; Since this code will disappear when Goops will be fully booted, | |
536 | ;; no precaution is taken to be efficient. | |
537 | ;; | |
538 | (define (make class . args) | |
539 | (cond | |
540 | ((or (eq? class <generic>) (eq? class <accessor>)) | |
541 | (let ((z (make-struct/no-tail class #f '() 0 '()))) | |
542 | (set-procedure-property! z 'name (get-keyword #:name args #f)) | |
543 | (invalidate-method-cache! z) | |
544 | (when (eq? class <accessor>) | |
545 | (let ((setter (get-keyword #:setter args #f))) | |
546 | (when setter | |
6c7dd9eb | 547 | (slot-set! z 'setter setter)))) |
e0590e7c AW |
548 | z)) |
549 | (else | |
550 | (let ((z (%allocate-instance class args))) | |
551 | (cond | |
552 | ((or (eq? class <method>) (eq? class <accessor-method>)) | |
553 | (for-each (match-lambda | |
554 | ((kw slot default) | |
555 | (slot-set! z slot (get-keyword kw args default)))) | |
556 | '((#:generic-function generic-function #f) | |
557 | (#:specializers specializers ()) | |
558 | (#:procedure procedure #f) | |
559 | (#:formals formals ()) | |
560 | (#:body body ()) | |
561 | (#:make-procedure make-procedure #f)))) | |
562 | ((memq <class> (class-precedence-list class)) | |
563 | (for-each (match-lambda | |
564 | ((kw slot default) | |
565 | (slot-set! z slot (get-keyword kw args default)))) | |
566 | '((#:name name ???) | |
567 | (#:dsupers direct-supers ()) | |
568 | (#:slots direct-slots ()) | |
569 | ))) | |
570 | (else | |
571 | (error "boot `make' does not support this class" class))) | |
572 | z)))) | |
573 | ||
574 | (define *dispatch-module* (current-module)) | |
575 | ||
576 | ;;; | |
577 | ;;; Generic functions have an applicable-methods cache associated with | |
578 | ;;; them. Every distinct set of types that is dispatched through a | |
579 | ;;; generic adds an entry to the cache. This cache gets compiled out to | |
580 | ;;; a dispatch procedure. In steady-state, this dispatch procedure is | |
581 | ;;; never recompiled; but during warm-up there is some churn, both to | |
582 | ;;; the cache and to the dispatch procedure. | |
583 | ;;; | |
584 | ;;; So what is the deal if warm-up happens in a multithreaded context? | |
585 | ;;; There is indeed a window between missing the cache for a certain set | |
586 | ;;; of arguments, and then updating the cache with the newly computed | |
587 | ;;; applicable methods. One of the updaters is liable to lose their new | |
588 | ;;; entry. | |
589 | ;;; | |
590 | ;;; This is actually OK though, because a subsequent cache miss for the | |
591 | ;;; race loser will just cause memoization to try again. The cache will | |
592 | ;;; eventually be consistent. We're not mutating the old part of the | |
593 | ;;; cache, just consing on the new entry. | |
594 | ;;; | |
595 | ;;; It doesn't even matter if the dispatch procedure and the cache are | |
596 | ;;; inconsistent -- most likely the type-set that lost the dispatch | |
597 | ;;; procedure race will simply re-trigger a memoization, but since the | |
598 | ;;; winner isn't in the effective-methods cache, it will likely also | |
599 | ;;; re-trigger a memoization, and the cache will finally be consistent. | |
600 | ;;; As you can see there is a possibility for ping-pong effects, but | |
601 | ;;; it's unlikely given the shortness of the window between slot-set! | |
602 | ;;; invocations. We could add a mutex, but it is strictly unnecessary, | |
603 | ;;; and would add runtime cost and complexity. | |
604 | ;;; | |
605 | ||
606 | (define (emit-linear-dispatch gf-sym nargs methods free rest?) | |
607 | (define (gen-syms n stem) | |
608 | (let lp ((n (1- n)) (syms '())) | |
609 | (if (< n 0) | |
610 | syms | |
611 | (lp (1- n) (cons (gensym stem) syms))))) | |
612 | (let* ((args (gen-syms nargs "a")) | |
613 | (types (gen-syms nargs "t"))) | |
614 | (let lp ((methods methods) | |
615 | (free free) | |
616 | (exp `(cache-miss ,gf-sym | |
617 | ,(if rest? | |
618 | `(cons* ,@args rest) | |
619 | `(list ,@args))))) | |
620 | (cond | |
621 | ((null? methods) | |
622 | (values `(,(if rest? `(,@args . rest) args) | |
623 | (let ,(map (lambda (t a) | |
624 | `(,t (class-of ,a))) | |
625 | types args) | |
626 | ,exp)) | |
627 | free)) | |
628 | (else | |
629 | ;; jeez | |
630 | (let preddy ((free free) | |
631 | (types types) | |
632 | (specs (vector-ref (car methods) 1)) | |
633 | (checks '())) | |
634 | (if (null? types) | |
635 | (let ((m-sym (gensym "p"))) | |
636 | (lp (cdr methods) | |
637 | (acons (vector-ref (car methods) 3) | |
638 | m-sym | |
639 | free) | |
640 | `(if (and . ,checks) | |
641 | ,(if rest? | |
642 | `(apply ,m-sym ,@args rest) | |
643 | `(,m-sym . ,args)) | |
644 | ,exp))) | |
645 | (let ((var (assq-ref free (car specs)))) | |
646 | (if var | |
647 | (preddy free | |
648 | (cdr types) | |
649 | (cdr specs) | |
650 | (cons `(eq? ,(car types) ,var) | |
651 | checks)) | |
652 | (let ((var (gensym "c"))) | |
653 | (preddy (acons (car specs) var free) | |
654 | (cdr types) | |
655 | (cdr specs) | |
656 | (cons `(eq? ,(car types) ,var) | |
657 | checks)))))))))))) | |
658 | ||
659 | (define (compute-dispatch-procedure gf cache) | |
660 | (define (scan) | |
661 | (let lp ((ls cache) (nreq -1) (nrest -1)) | |
662 | (cond | |
663 | ((null? ls) | |
664 | (collate (make-vector (1+ nreq) '()) | |
665 | (make-vector (1+ nrest) '()))) | |
666 | ((vector-ref (car ls) 2) ; rest | |
667 | (lp (cdr ls) nreq (max nrest (vector-ref (car ls) 0)))) | |
668 | (else ; req | |
669 | (lp (cdr ls) (max nreq (vector-ref (car ls) 0)) nrest))))) | |
670 | (define (collate req rest) | |
671 | (let lp ((ls cache)) | |
672 | (cond | |
673 | ((null? ls) | |
674 | (emit req rest)) | |
675 | ((vector-ref (car ls) 2) ; rest | |
676 | (let ((n (vector-ref (car ls) 0))) | |
677 | (vector-set! rest n (cons (car ls) (vector-ref rest n))) | |
678 | (lp (cdr ls)))) | |
679 | (else ; req | |
680 | (let ((n (vector-ref (car ls) 0))) | |
681 | (vector-set! req n (cons (car ls) (vector-ref req n))) | |
682 | (lp (cdr ls))))))) | |
683 | (define (emit req rest) | |
684 | (let ((gf-sym (gensym "g"))) | |
685 | (define (emit-rest n clauses free) | |
686 | (if (< n (vector-length rest)) | |
687 | (let ((methods (vector-ref rest n))) | |
688 | (cond | |
689 | ((null? methods) | |
690 | (emit-rest (1+ n) clauses free)) | |
691 | ;; FIXME: hash dispatch | |
692 | (else | |
693 | (call-with-values | |
694 | (lambda () | |
695 | (emit-linear-dispatch gf-sym n methods free #t)) | |
696 | (lambda (clause free) | |
697 | (emit-rest (1+ n) (cons clause clauses) free)))))) | |
698 | (emit-req (1- (vector-length req)) clauses free))) | |
699 | (define (emit-req n clauses free) | |
700 | (if (< n 0) | |
701 | (comp `(lambda ,(map cdr free) | |
702 | (case-lambda ,@clauses)) | |
703 | (map car free)) | |
704 | (let ((methods (vector-ref req n))) | |
51fd1cd6 | 705 | (cond |
e0590e7c AW |
706 | ((null? methods) |
707 | (emit-req (1- n) clauses free)) | |
708 | ;; FIXME: hash dispatch | |
51fd1cd6 | 709 | (else |
e0590e7c AW |
710 | (call-with-values |
711 | (lambda () | |
712 | (emit-linear-dispatch gf-sym n methods free #f)) | |
713 | (lambda (clause free) | |
714 | (emit-req (1- n) (cons clause clauses) free)))))))) | |
715 | ||
716 | (emit-rest 0 | |
717 | (if (or (zero? (vector-length rest)) | |
718 | (null? (vector-ref rest 0))) | |
719 | (list `(args (cache-miss ,gf-sym args))) | |
720 | '()) | |
721 | (acons gf gf-sym '())))) | |
722 | (define (comp exp vals) | |
723 | ;; When cross-compiling Guile itself, the native Guile must generate | |
724 | ;; code for the host. | |
725 | (with-target %host-type | |
726 | (lambda () | |
727 | (let ((p ((@ (system base compile) compile) exp | |
728 | #:env *dispatch-module* | |
729 | #:from 'scheme | |
730 | #:opts '(#:partial-eval? #f #:cse? #f)))) | |
731 | (apply p vals))))) | |
732 | ||
733 | ;; kick it. | |
734 | (scan)) | |
735 | ||
736 | ;; o/~ ten, nine, eight | |
737 | ;; sometimes that's just how it goes | |
738 | ;; three, two, one | |
739 | ;; | |
740 | ;; get out before it blows o/~ | |
741 | ;; | |
742 | (define timer-init 30) | |
743 | (define (delayed-compile gf) | |
744 | (let ((timer timer-init)) | |
745 | (lambda args | |
746 | (set! timer (1- timer)) | |
747 | (cond | |
748 | ((zero? timer) | |
749 | (let ((dispatch (compute-dispatch-procedure | |
750 | gf (slot-ref gf 'effective-methods)))) | |
751 | (slot-set! gf 'procedure dispatch) | |
752 | (apply dispatch args))) | |
753 | (else | |
754 | ;; interestingly, this catches recursive compilation attempts as | |
755 | ;; well; in that case, timer is negative | |
756 | (cache-dispatch gf args)))))) | |
757 | ||
758 | (define (cache-dispatch gf args) | |
759 | (define (map-until n f ls) | |
760 | (if (or (zero? n) (null? ls)) | |
761 | '() | |
762 | (cons (f (car ls)) (map-until (1- n) f (cdr ls))))) | |
763 | (define (equal? x y) ; can't use the stock equal? because it's a generic... | |
764 | (cond ((pair? x) (and (pair? y) | |
765 | (eq? (car x) (car y)) | |
766 | (equal? (cdr x) (cdr y)))) | |
767 | ((null? x) (null? y)) | |
768 | (else #f))) | |
769 | (if (slot-ref gf 'n-specialized) | |
770 | (let ((types (map-until (slot-ref gf 'n-specialized) class-of args))) | |
771 | (let lp ((cache (slot-ref gf 'effective-methods))) | |
772 | (cond ((null? cache) | |
773 | (cache-miss gf args)) | |
774 | ((equal? (vector-ref (car cache) 1) types) | |
775 | (apply (vector-ref (car cache) 3) args)) | |
776 | (else (lp (cdr cache)))))) | |
777 | (cache-miss gf args))) | |
778 | ||
779 | (define (cache-miss gf args) | |
780 | (apply (memoize-method! gf args) args)) | |
781 | ||
782 | (define (memoize-effective-method! gf args applicable) | |
783 | (define (first-n ls n) | |
784 | (if (or (zero? n) (null? ls)) | |
785 | '() | |
786 | (cons (car ls) (first-n (cdr ls) (- n 1))))) | |
787 | (define (parse n ls) | |
788 | (cond ((null? ls) | |
789 | (memoize n #f (map class-of args))) | |
790 | ((= n (slot-ref gf 'n-specialized)) | |
791 | (memoize n #t (map class-of (first-n args n)))) | |
792 | (else | |
793 | (parse (1+ n) (cdr ls))))) | |
794 | (define (memoize len rest? types) | |
795 | (let* ((cmethod (compute-cmethod applicable types)) | |
796 | (cache (cons (vector len types rest? cmethod) | |
797 | (slot-ref gf 'effective-methods)))) | |
798 | (slot-set! gf 'effective-methods cache) | |
799 | (slot-set! gf 'procedure (delayed-compile gf)) | |
800 | cmethod)) | |
801 | (parse 0 args)) | |
51fd1cd6 | 802 | |
e0590e7c AW |
803 | ;;; |
804 | ;;; Compiling next methods into method bodies | |
805 | ;;; | |
806 | ||
807 | ;;; So, for the reader: there basic idea is that, given that the | |
808 | ;;; semantics of `next-method' depend on the concrete types being | |
809 | ;;; dispatched, why not compile a specific procedure to handle each type | |
810 | ;;; combination that we see at runtime. | |
811 | ;;; | |
812 | ;;; In theory we can do much better than a bytecode compilation, because | |
813 | ;;; we know the *exact* types of the arguments. It's ideal for native | |
814 | ;;; compilation. A task for the future. | |
815 | ;;; | |
816 | ;;; I think this whole generic application mess would benefit from a | |
817 | ;;; strict MOP. | |
818 | ||
819 | (define (compute-cmethod methods types) | |
820 | (let ((make-procedure (slot-ref (car methods) 'make-procedure))) | |
821 | (if make-procedure | |
822 | (make-procedure | |
823 | (if (null? (cdr methods)) | |
824 | (lambda args | |
825 | (no-next-method (method-generic-function (car methods)) args)) | |
826 | (compute-cmethod (cdr methods) types))) | |
827 | (method-procedure (car methods))))) | |
828 | ||
829 | ;;; | |
830 | ;;; Memoization | |
831 | ;;; | |
832 | ||
833 | (define (memoize-method! gf args) | |
834 | (let ((applicable ((if (eq? gf compute-applicable-methods) | |
835 | %compute-applicable-methods | |
836 | compute-applicable-methods) | |
837 | gf args))) | |
838 | (cond (applicable | |
839 | (memoize-effective-method! gf args applicable)) | |
840 | (else | |
841 | (no-applicable-method gf args))))) | |
842 | ||
843 | (set-procedure-property! memoize-method! 'system-procedure #t) | |
844 | ||
845 | (define no-applicable-method | |
846 | (make <generic> #:name 'no-applicable-method)) | |
847 | ||
848 | (%goops-early-init) | |
82ab5090 | 849 | |
78ec533c | 850 | ;; Then load the rest of GOOPS |
14f1d9fe | 851 | |
14f1d9fe | 852 | \f |
51385517 | 853 | ;; FIXME: deprecate. |
e0590e7c AW |
854 | (define min-fixnum (- (expt 2 29))) |
855 | (define max-fixnum (- (expt 2 29) 1)) | |
14f1d9fe MD |
856 | |
857 | ;; | |
858 | ;; goops-error | |
859 | ;; | |
860 | (define (goops-error format-string . args) | |
14f1d9fe MD |
861 | (scm-error 'goops-error #f format-string args '())) |
862 | ||
863 | ;; | |
864 | ;; is-a? | |
865 | ;; | |
866 | (define (is-a? obj class) | |
867 | (and (memq class (class-precedence-list (class-of obj))) #t)) | |
868 | ||
869 | ||
870 | ;;; | |
871 | ;;; {Meta classes} | |
872 | ;;; | |
873 | ||
874 | (define ensure-metaclass-with-supers | |
875 | (let ((table-of-metas '())) | |
876 | (lambda (meta-supers) | |
877 | (let ((entry (assoc meta-supers table-of-metas))) | |
878 | (if entry | |
879 | ;; Found a previously created metaclass | |
880 | (cdr entry) | |
881 | ;; Create a new meta-class which inherit from "meta-supers" | |
882 | (let ((new (make <class> #:dsupers meta-supers | |
883 | #:slots '() | |
884 | #:name (gensym "metaclass")))) | |
885 | (set! table-of-metas (cons (cons meta-supers new) table-of-metas)) | |
886 | new)))))) | |
887 | ||
9d019f9b | 888 | (define (ensure-metaclass supers) |
14f1d9fe MD |
889 | (if (null? supers) |
890 | <class> | |
891 | (let* ((all-metas (map (lambda (x) (class-of x)) supers)) | |
af35fc20 AW |
892 | (all-cpls (append-map (lambda (m) |
893 | (cdr (class-precedence-list m))) | |
894 | all-metas)) | |
14f1d9fe MD |
895 | (needed-metas '())) |
896 | ;; Find the most specific metaclasses. The new metaclass will be | |
897 | ;; a subclass of these. | |
898 | (for-each | |
899 | (lambda (meta) | |
900 | (if (and (not (member meta all-cpls)) | |
901 | (not (member meta needed-metas))) | |
902 | (set! needed-metas (append needed-metas (list meta))))) | |
903 | all-metas) | |
904 | ;; Now return a subclass of the metaclasses we found. | |
905 | (if (null? (cdr needed-metas)) | |
906 | (car needed-metas) ; If there's only one, just use it. | |
907 | (ensure-metaclass-with-supers needed-metas))))) | |
908 | ||
909 | ;;; | |
910 | ;;; {Classes} | |
911 | ;;; | |
912 | ||
913 | ;;; (define-class NAME (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
914 | ;;; | |
915 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
916 | ;;; OPTION ::= KEYWORD VALUE | |
917 | ;;; | |
14f1d9fe | 918 | |
b3501b80 | 919 | (define (make-class supers slots . options) |
9d019f9b AW |
920 | (let* ((name (get-keyword #:name options (make-unbound))) |
921 | (supers (if (not (or-map (lambda (class) | |
922 | (memq <object> | |
923 | (class-precedence-list class))) | |
924 | supers)) | |
925 | (append supers (list <object>)) | |
926 | supers)) | |
927 | (metaclass (or (get-keyword #:metaclass options #f) | |
928 | (ensure-metaclass supers)))) | |
929 | ||
930 | ;; Verify that all direct slots are different and that we don't inherit | |
931 | ;; several time from the same class | |
932 | (let ((tmp1 (find-duplicate supers)) | |
933 | (tmp2 (find-duplicate (map slot-definition-name slots)))) | |
934 | (if tmp1 | |
935 | (goops-error "make-class: super class ~S is duplicate in class ~S" | |
936 | tmp1 name)) | |
937 | (if tmp2 | |
938 | (goops-error "make-class: slot ~S is duplicate in class ~S" | |
939 | tmp2 name))) | |
940 | ||
941 | ;; Everything seems correct, build the class | |
942 | (apply make metaclass | |
943 | #:dsupers supers | |
944 | #:slots slots | |
945 | #:name name | |
946 | options))) | |
14f1d9fe MD |
947 | |
948 | ;;; (class (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
949 | ;;; | |
950 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
951 | ;;; OPTION ::= KEYWORD VALUE | |
952 | ;;; | |
f840ed25 AW |
953 | (define-syntax class |
954 | (lambda (x) | |
955 | (define (parse-options options) | |
956 | (syntax-case options () | |
957 | (() #'()) | |
958 | ((kw arg . options) (keyword? (syntax->datum #'kw)) | |
959 | (with-syntax ((options (parse-options #'options))) | |
960 | (syntax-case #'kw () | |
961 | (#:init-form | |
962 | #'(kw 'arg #:init-thunk (lambda () arg) . options)) | |
963 | (_ | |
964 | #'(kw arg . options))))))) | |
965 | (define (check-valid-kwargs args) | |
966 | (syntax-case args () | |
967 | (() #'()) | |
968 | ((kw arg . args) (keyword? (syntax->datum #'kw)) | |
969 | #`(kw arg . #,(check-valid-kwargs #'args))))) | |
970 | (define (parse-slots-and-kwargs args) | |
971 | (syntax-case args () | |
972 | (() | |
973 | #'(() ())) | |
974 | ((kw . _) (keyword? (syntax->datum #'kw)) | |
975 | #`(() #,(check-valid-kwargs args))) | |
976 | (((name option ...) args ...) | |
977 | (with-syntax (((slots kwargs) (parse-slots-and-kwargs #'(args ...))) | |
978 | ((option ...) (parse-options #'(option ...)))) | |
979 | #'(((list 'name option ...) . slots) kwargs))) | |
980 | ((name args ...) (symbol? (syntax->datum #'name)) | |
981 | (with-syntax (((slots kwargs) (parse-slots-and-kwargs #'(args ...)))) | |
982 | #'(('(name) . slots) kwargs))))) | |
983 | (syntax-case x () | |
984 | ((class (super ...) arg ...) | |
985 | (with-syntax ((((slot-def ...) (option ...)) | |
986 | (parse-slots-and-kwargs #'(arg ...)))) | |
987 | #'(make-class (list super ...) | |
988 | (list slot-def ...) | |
989 | option ...)))))) | |
14f1d9fe | 990 | |
b3501b80 AW |
991 | (define-syntax define-class-pre-definition |
992 | (lambda (x) | |
993 | (syntax-case x () | |
994 | ((_ (k arg rest ...) out ...) | |
0dd8493c AW |
995 | (keyword? (syntax->datum #'k)) |
996 | (case (syntax->datum #'k) | |
b3501b80 | 997 | ((#:getter #:setter) |
0dd8493c AW |
998 | #'(define-class-pre-definition (rest ...) |
999 | out ... | |
1000 | (if (or (not (defined? 'arg)) | |
1001 | (not (is-a? arg <generic>))) | |
1002 | (toplevel-define! | |
1003 | 'arg | |
1004 | (ensure-generic (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 1005 | ((#:accessor) |
0dd8493c AW |
1006 | #'(define-class-pre-definition (rest ...) |
1007 | out ... | |
1008 | (if (or (not (defined? 'arg)) | |
1009 | (not (is-a? arg <accessor>))) | |
1010 | (toplevel-define! | |
1011 | 'arg | |
1012 | (ensure-accessor (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 1013 | (else |
0dd8493c | 1014 | #'(define-class-pre-definition (rest ...) out ...)))) |
b3501b80 | 1015 | ((_ () out ...) |
0dd8493c | 1016 | #'(begin out ...))))) |
b3501b80 AW |
1017 | |
1018 | ;; Some slot options require extra definitions to be made. In | |
1019 | ;; particular, we want to make sure that the generic function objects | |
1020 | ;; which represent accessors exist before `make-class' tries to add | |
1021 | ;; methods to them. | |
1022 | (define-syntax define-class-pre-definitions | |
1023 | (lambda (x) | |
1024 | (syntax-case x () | |
1025 | ((_ () out ...) | |
0dd8493c | 1026 | #'(begin out ...)) |
b3501b80 | 1027 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
1028 | (keyword? (syntax->datum #'slot)) |
1029 | #'(begin out ...)) | |
b3501b80 | 1030 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
1031 | (identifier? #'slot) |
1032 | #'(define-class-pre-definitions (rest ...) | |
1033 | out ...)) | |
b3501b80 | 1034 | ((_ ((slotname slotopt ...) rest ...) out ...) |
0dd8493c AW |
1035 | #'(define-class-pre-definitions (rest ...) |
1036 | out ... (define-class-pre-definition (slotopt ...))))))) | |
b3501b80 | 1037 | |
0c65f52c AW |
1038 | (define-syntax-rule (define-class name supers slot ...) |
1039 | (begin | |
1040 | (define-class-pre-definitions (slot ...)) | |
1041 | (if (and (defined? 'name) | |
1042 | (is-a? name <class>) | |
1043 | (memq <object> (class-precedence-list name))) | |
1044 | (class-redefinition name | |
1045 | (class supers slot ... #:name 'name)) | |
1046 | (toplevel-define! 'name (class supers slot ... #:name 'name))))) | |
b3501b80 | 1047 | |
0c65f52c AW |
1048 | (define-syntax-rule (standard-define-class arg ...) |
1049 | (define-class arg ...)) | |
14f1d9fe MD |
1050 | |
1051 | ;;; | |
1052 | ;;; {Generic functions and accessors} | |
1053 | ;;; | |
1054 | ||
1d83f47e AW |
1055 | ;; Apparently the desired semantics are that we extend previous |
1056 | ;; procedural definitions, but that if `name' was already a generic, we | |
1057 | ;; overwrite its definition. | |
7cb88cbc AW |
1058 | (define-syntax define-generic |
1059 | (lambda (x) | |
1060 | (syntax-case x () | |
1061 | ((define-generic name) (symbol? (syntax->datum #'name)) | |
1062 | #'(define name | |
1063 | (if (and (defined? 'name) (is-a? name <generic>)) | |
1064 | (make <generic> #:name 'name) | |
1065 | (ensure-generic (if (defined? 'name) name #f) 'name))))))) | |
1066 | ||
1067 | (define-syntax define-extended-generic | |
1068 | (lambda (x) | |
1069 | (syntax-case x () | |
1070 | ((define-extended-generic name val) (symbol? (syntax->datum #'name)) | |
1071 | #'(define name (make-extended-generic val 'name)))))) | |
1072 | ||
1073 | (define-syntax define-extended-generics | |
1074 | (lambda (x) | |
1075 | (define (id-append ctx a b) | |
1076 | (datum->syntax ctx (symbol-append (syntax->datum a) (syntax->datum b)))) | |
1077 | (syntax-case x () | |
1078 | ((define-extended-generic (name ...) #:prefix (prefix ...)) | |
1079 | (and (and-map symbol? (syntax->datum #'(name ...))) | |
1080 | (and-map symbol? (syntax->datum #'(prefix ...)))) | |
1081 | (with-syntax ((((val ...)) (map (lambda (name) | |
1082 | (map (lambda (prefix) | |
1083 | (id-append name prefix name)) | |
1084 | #'(prefix ...))) | |
1085 | #'(name ...)))) | |
1086 | #'(begin | |
1087 | (define-extended-generic name (list val ...)) | |
1088 | ...)))))) | |
bbf8d523 | 1089 | |
a8c10aa1 AW |
1090 | (define* (make-generic #:optional name) |
1091 | (make <generic> #:name name)) | |
14f1d9fe | 1092 | |
a8c10aa1 AW |
1093 | (define* (make-extended-generic gfs #:optional name) |
1094 | (let* ((gfs (if (list? gfs) gfs (list gfs))) | |
bbf8d523 MD |
1095 | (gws? (any (lambda (gf) (is-a? gf <generic-with-setter>)) gfs))) |
1096 | (let ((ans (if gws? | |
1097 | (let* ((sname (and name (make-setter-name name))) | |
1098 | (setters | |
af35fc20 | 1099 | (append-map (lambda (gf) |
bbf8d523 MD |
1100 | (if (is-a? gf <generic-with-setter>) |
1101 | (list (ensure-generic (setter gf) | |
1102 | sname)) | |
1103 | '())) | |
af35fc20 | 1104 | gfs)) |
bbf8d523 MD |
1105 | (es (make <extended-generic-with-setter> |
1106 | #:name name | |
1107 | #:extends gfs | |
1108 | #:setter (make <extended-generic> | |
1109 | #:name sname | |
1110 | #:extends setters)))) | |
1111 | (extended-by! setters (setter es)) | |
1112 | es) | |
1113 | (make <extended-generic> | |
1114 | #:name name | |
1115 | #:extends gfs)))) | |
1116 | (extended-by! gfs ans) | |
1117 | ans))) | |
1118 | ||
1119 | (define (extended-by! gfs eg) | |
1120 | (for-each (lambda (gf) | |
1121 | (slot-set! gf 'extended-by | |
1122 | (cons eg (slot-ref gf 'extended-by)))) | |
eddd81f4 AW |
1123 | gfs) |
1124 | (invalidate-method-cache! eg)) | |
bbf8d523 MD |
1125 | |
1126 | (define (not-extended-by! gfs eg) | |
1127 | (for-each (lambda (gf) | |
1128 | (slot-set! gf 'extended-by | |
1129 | (delq! eg (slot-ref gf 'extended-by)))) | |
eddd81f4 AW |
1130 | gfs) |
1131 | (invalidate-method-cache! eg)) | |
bbf8d523 | 1132 | |
a8c10aa1 AW |
1133 | (define* (ensure-generic old-definition #:optional name) |
1134 | (cond ((is-a? old-definition <generic>) old-definition) | |
1135 | ((procedure-with-setter? old-definition) | |
1136 | (make <generic-with-setter> | |
1137 | #:name name | |
1138 | #:default (procedure old-definition) | |
1139 | #:setter (setter old-definition))) | |
1140 | ((procedure? old-definition) | |
1141 | (if (generic-capability? old-definition) old-definition | |
1142 | (make <generic> #:name name #:default old-definition))) | |
1143 | (else (make <generic> #:name name)))) | |
14f1d9fe | 1144 | |
1d83f47e | 1145 | ;; same semantics as <generic> |
0c65f52c AW |
1146 | (define-syntax-rule (define-accessor name) |
1147 | (define name | |
1148 | (cond ((not (defined? 'name)) (ensure-accessor #f 'name)) | |
1149 | ((is-a? name <accessor>) (make <accessor> #:name 'name)) | |
1150 | (else (ensure-accessor name 'name))))) | |
c31142ee | 1151 | |
14f1d9fe MD |
1152 | (define (make-setter-name name) |
1153 | (string->symbol (string-append "setter:" (symbol->string name)))) | |
1154 | ||
a8c10aa1 AW |
1155 | (define* (make-accessor #:optional name) |
1156 | (make <accessor> | |
1157 | #:name name | |
1158 | #:setter (make <generic> | |
1159 | #:name (and name (make-setter-name name))))) | |
1160 | ||
1161 | (define* (ensure-accessor proc #:optional name) | |
1162 | (cond ((and (is-a? proc <accessor>) | |
1163 | (is-a? (setter proc) <generic>)) | |
1164 | proc) | |
1165 | ((is-a? proc <generic-with-setter>) | |
1166 | (upgrade-accessor proc (setter proc))) | |
1167 | ((is-a? proc <generic>) | |
1168 | (upgrade-accessor proc (make-generic name))) | |
1169 | ((procedure-with-setter? proc) | |
1170 | (make <accessor> | |
1171 | #:name name | |
1172 | #:default (procedure proc) | |
1173 | #:setter (ensure-generic (setter proc) name))) | |
1174 | ((procedure? proc) | |
1175 | (ensure-accessor (if (generic-capability? proc) | |
1176 | (make <generic> #:name name #:default proc) | |
1177 | (ensure-generic proc name)) | |
1178 | name)) | |
1179 | (else | |
1180 | (make-accessor name)))) | |
14f1d9fe | 1181 | |
f8af5c6d | 1182 | (define (upgrade-accessor generic setter) |
bbf8d523 MD |
1183 | (let ((methods (slot-ref generic 'methods)) |
1184 | (gws (make (if (is-a? generic <extended-generic>) | |
1185 | <extended-generic-with-setter> | |
f8af5c6d | 1186 | <accessor>) |
14f1d9fe | 1187 | #:name (generic-function-name generic) |
bbf8d523 | 1188 | #:extended-by (slot-ref generic 'extended-by) |
14f1d9fe | 1189 | #:setter setter))) |
bbf8d523 MD |
1190 | (if (is-a? generic <extended-generic>) |
1191 | (let ((gfs (slot-ref generic 'extends))) | |
1192 | (not-extended-by! gfs generic) | |
1193 | (slot-set! gws 'extends gfs) | |
1194 | (extended-by! gfs gws))) | |
14f1d9fe MD |
1195 | ;; Steal old methods |
1196 | (for-each (lambda (method) | |
1197 | (slot-set! method 'generic-function gws)) | |
1198 | methods) | |
1199 | (slot-set! gws 'methods methods) | |
eddd81f4 | 1200 | (invalidate-method-cache! gws) |
14f1d9fe MD |
1201 | gws)) |
1202 | ||
1203 | ;;; | |
1204 | ;;; {Methods} | |
1205 | ;;; | |
1206 | ||
3a0d1412 AW |
1207 | ;; Note: `a' and `b' can have unequal lengths (i.e. one can be one |
1208 | ;; element longer than the other when we have a dotted parameter | |
1209 | ;; list). For instance, with the call | |
1210 | ;; | |
1211 | ;; (M 1) | |
1212 | ;; | |
1213 | ;; with | |
1214 | ;; | |
1215 | ;; (define-method M (a . l) ....) | |
1216 | ;; (define-method M (a) ....) | |
1217 | ;; | |
1218 | ;; we consider that the second method is more specific. | |
1219 | ;; | |
1220 | ;; Precondition: `a' and `b' are methods and are applicable to `types'. | |
1221 | (define (%method-more-specific? a b types) | |
1222 | (let lp ((a-specializers (method-specializers a)) | |
1223 | (b-specializers (method-specializers b)) | |
1224 | (types types)) | |
1225 | (cond | |
1226 | ;; (a) less specific than (a b ...) or (a . b) | |
1227 | ((null? a-specializers) #t) | |
1228 | ;; (a b ...) or (a . b) less specific than (a) | |
1229 | ((null? b-specializers) #f) | |
1230 | ;; (a . b) less specific than (a b ...) | |
1231 | ((not (pair? a-specializers)) #f) | |
1232 | ;; (a b ...) more specific than (a . b) | |
1233 | ((not (pair? b-specializers)) #t) | |
1234 | (else | |
1235 | (let ((a-specializer (car a-specializers)) | |
1236 | (b-specializer (car b-specializers)) | |
1237 | (a-specializers (cdr a-specializers)) | |
1238 | (b-specializers (cdr b-specializers)) | |
1239 | (type (car types)) | |
1240 | (types (cdr types))) | |
1241 | (if (eq? a-specializer b-specializer) | |
1242 | (lp a-specializers b-specializers types) | |
1243 | (let lp ((cpl (class-precedence-list type))) | |
1244 | (let ((elt (car cpl))) | |
1245 | (cond | |
1246 | ((eq? a-specializer elt) #t) | |
1247 | ((eq? b-specializer elt) #f) | |
1248 | (else (lp (cdr cpl)))))))))))) | |
1249 | ||
c0a56ec7 AW |
1250 | (define (%sort-applicable-methods methods types) |
1251 | (sort methods (lambda (a b) (%method-more-specific? a b types)))) | |
1252 | ||
1253 | (define (%compute-applicable-methods gf args) | |
1254 | (define (method-applicable? m types) | |
1255 | (let lp ((specs (method-specializers m)) (types types)) | |
1256 | (cond | |
1257 | ((null? specs) (null? types)) | |
1258 | ((not (pair? specs)) #t) | |
1259 | ((null? types) #f) | |
1260 | (else | |
1261 | (and (memq (car specs) (class-precedence-list (car types))) | |
1262 | (lp (cdr specs) (cdr types))))))) | |
1263 | (let ((n (length args)) | |
1264 | (types (map class-of args))) | |
1265 | (let lp ((methods (generic-function-methods gf)) | |
1266 | (applicable '())) | |
1267 | (if (null? methods) | |
1268 | (and (not (null? applicable)) | |
1269 | (%sort-applicable-methods applicable types)) | |
1270 | (let ((m (car methods))) | |
1271 | (lp (cdr methods) | |
1272 | (if (method-applicable? m types) | |
1273 | (cons m applicable) | |
1274 | applicable))))))) | |
1275 | ||
1276 | (define compute-applicable-methods %compute-applicable-methods) | |
1277 | ||
2ce560b9 AW |
1278 | (define (toplevel-define! name val) |
1279 | (module-define! (current-module) name val)) | |
1280 | ||
1281 | (define-syntax define-method | |
1282 | (syntax-rules (setter) | |
1283 | ((_ ((setter name) . args) body ...) | |
1284 | (begin | |
1285 | (if (or (not (defined? 'name)) | |
1286 | (not (is-a? name <accessor>))) | |
1287 | (toplevel-define! 'name | |
1288 | (ensure-accessor | |
1289 | (if (defined? 'name) name #f) 'name))) | |
1290 | (add-method! (setter name) (method args body ...)))) | |
1291 | ((_ (name . args) body ...) | |
1292 | (begin | |
1293 | ;; FIXME: this code is how it always was, but it's quite cracky: | |
1294 | ;; it will only define the generic function if it was undefined | |
1295 | ;; before (ok), or *was defined to #f*. The latter is crack. But | |
1296 | ;; there are bootstrap issues about fixing this -- change it to | |
1297 | ;; (is-a? name <generic>) and see. | |
1298 | (if (or (not (defined? 'name)) | |
1299 | (not name)) | |
1300 | (toplevel-define! 'name (make <generic> #:name 'name))) | |
1301 | (add-method! name (method args body ...)))))) | |
14f1d9fe | 1302 | |
47c8983f AW |
1303 | (define-syntax method |
1304 | (lambda (x) | |
d6392715 AW |
1305 | (define (parse-args args) |
1306 | (let lp ((ls args) (formals '()) (specializers '())) | |
47c8983f | 1307 | (syntax-case ls () |
d6392715 | 1308 | (((f s) . rest) |
0dd8493c AW |
1309 | (and (identifier? #'f) (identifier? #'s)) |
1310 | (lp #'rest | |
1311 | (cons #'f formals) | |
1312 | (cons #'s specializers))) | |
d6392715 | 1313 | ((f . rest) |
0dd8493c AW |
1314 | (identifier? #'f) |
1315 | (lp #'rest | |
1316 | (cons #'f formals) | |
1317 | (cons #'<top> specializers))) | |
d6392715 AW |
1318 | (() |
1319 | (list (reverse formals) | |
0dd8493c | 1320 | (reverse (cons #''() specializers)))) |
d6392715 | 1321 | (tail |
0dd8493c AW |
1322 | (identifier? #'tail) |
1323 | (list (append (reverse formals) #'tail) | |
1324 | (reverse (cons #'<top> specializers))))))) | |
47c8983f AW |
1325 | |
1326 | (define (find-free-id exp referent) | |
1327 | (syntax-case exp () | |
1328 | ((x . y) | |
0dd8493c AW |
1329 | (or (find-free-id #'x referent) |
1330 | (find-free-id #'y referent))) | |
47c8983f | 1331 | (x |
0dd8493c AW |
1332 | (identifier? #'x) |
1333 | (let ((id (datum->syntax #'x referent))) | |
1334 | (and (free-identifier=? #'x id) id))) | |
47c8983f AW |
1335 | (_ #f))) |
1336 | ||
1337 | (define (compute-procedure formals body) | |
1338 | (syntax-case body () | |
1339 | ((body0 ...) | |
1340 | (with-syntax ((formals formals)) | |
0dd8493c | 1341 | #'(lambda formals body0 ...))))) |
47c8983f AW |
1342 | |
1343 | (define (->proper args) | |
1344 | (let lp ((ls args) (out '())) | |
1345 | (syntax-case ls () | |
0dd8493c | 1346 | ((x . xs) (lp #'xs (cons #'x out))) |
47c8983f | 1347 | (() (reverse out)) |
0dd8493c | 1348 | (tail (reverse (cons #'tail out)))))) |
47c8983f AW |
1349 | |
1350 | (define (compute-make-procedure formals body next-method) | |
1351 | (syntax-case body () | |
1352 | ((body ...) | |
1353 | (with-syntax ((next-method next-method)) | |
1354 | (syntax-case formals () | |
1355 | ((formal ...) | |
0dd8493c AW |
1356 | #'(lambda (real-next-method) |
1357 | (lambda (formal ...) | |
1358 | (let ((next-method (lambda args | |
1359 | (if (null? args) | |
1360 | (real-next-method formal ...) | |
1361 | (apply real-next-method args))))) | |
1362 | body ...)))) | |
47c8983f | 1363 | (formals |
0dd8493c AW |
1364 | (with-syntax (((formal ...) (->proper #'formals))) |
1365 | #'(lambda (real-next-method) | |
1366 | (lambda formals | |
1367 | (let ((next-method (lambda args | |
1368 | (if (null? args) | |
1369 | (apply real-next-method formal ...) | |
1370 | (apply real-next-method args))))) | |
1371 | body ...)))))))))) | |
47c8983f AW |
1372 | |
1373 | (define (compute-procedures formals body) | |
1374 | ;; So, our use of this is broken, because it operates on the | |
1375 | ;; pre-expansion source code. It's equivalent to just searching | |
1376 | ;; for referent in the datums. Ah well. | |
1377 | (let ((id (find-free-id body 'next-method))) | |
1378 | (if id | |
1379 | ;; return a make-procedure | |
0dd8493c | 1380 | (values #'#f |
47c8983f AW |
1381 | (compute-make-procedure formals body id)) |
1382 | (values (compute-procedure formals body) | |
0dd8493c | 1383 | #'#f)))) |
47c8983f AW |
1384 | |
1385 | (syntax-case x () | |
0dd8493c | 1386 | ((_ args) #'(method args (if #f #f))) |
47c8983f | 1387 | ((_ args body0 body1 ...) |
0dd8493c | 1388 | (with-syntax (((formals (specializer ...)) (parse-args #'args))) |
47c8983f AW |
1389 | (call-with-values |
1390 | (lambda () | |
0dd8493c | 1391 | (compute-procedures #'formals #'(body0 body1 ...))) |
47c8983f AW |
1392 | (lambda (procedure make-procedure) |
1393 | (with-syntax ((procedure procedure) | |
1394 | (make-procedure make-procedure)) | |
0dd8493c AW |
1395 | #'(make <method> |
1396 | #:specializers (cons* specializer ...) | |
1397 | #:formals 'formals | |
1398 | #:body '(body0 body1 ...) | |
1399 | #:make-procedure make-procedure | |
1400 | #:procedure procedure))))))))) | |
14f1d9fe MD |
1401 | |
1402 | ;;; | |
1403 | ;;; {add-method!} | |
1404 | ;;; | |
1405 | ||
1406 | (define (add-method-in-classes! m) | |
1407 | ;; Add method in all the classes which appears in its specializers list | |
1408 | (for-each* (lambda (x) | |
1409 | (let ((dm (class-direct-methods x))) | |
81600208 | 1410 | (if (not (memq m dm)) |
14f1d9fe MD |
1411 | (slot-set! x 'direct-methods (cons m dm))))) |
1412 | (method-specializers m))) | |
1413 | ||
1414 | (define (remove-method-in-classes! m) | |
1415 | ;; Remove method in all the classes which appears in its specializers list | |
1416 | (for-each* (lambda (x) | |
1417 | (slot-set! x | |
1418 | 'direct-methods | |
1419 | (delv! m (class-direct-methods x)))) | |
1420 | (method-specializers m))) | |
1421 | ||
1422 | (define (compute-new-list-of-methods gf new) | |
1423 | (let ((new-spec (method-specializers new)) | |
bbf8d523 | 1424 | (methods (slot-ref gf 'methods))) |
14f1d9fe MD |
1425 | (let loop ((l methods)) |
1426 | (if (null? l) | |
1427 | (cons new methods) | |
1428 | (if (equal? (method-specializers (car l)) new-spec) | |
1429 | (begin | |
1430 | ;; This spec. list already exists. Remove old method from dependents | |
1431 | (remove-method-in-classes! (car l)) | |
1432 | (set-car! l new) | |
1433 | methods) | |
1434 | (loop (cdr l))))))) | |
1435 | ||
eddd81f4 AW |
1436 | (define (method-n-specializers m) |
1437 | (length* (slot-ref m 'specializers))) | |
1438 | ||
1439 | (define (calculate-n-specialized gf) | |
1440 | (fold (lambda (m n) (max n (method-n-specializers m))) | |
1441 | 0 | |
1442 | (generic-function-methods gf))) | |
1443 | ||
1444 | (define (invalidate-method-cache! gf) | |
1445 | (%invalidate-method-cache! gf) | |
1446 | (slot-set! gf 'n-specialized (calculate-n-specialized gf)) | |
1447 | (for-each (lambda (gf) (invalidate-method-cache! gf)) | |
1448 | (slot-ref gf 'extended-by))) | |
1449 | ||
7d38f3d8 AW |
1450 | (define internal-add-method! |
1451 | (method ((gf <generic>) (m <method>)) | |
1452 | (slot-set! m 'generic-function gf) | |
1453 | (slot-set! gf 'methods (compute-new-list-of-methods gf m)) | |
eddd81f4 | 1454 | (invalidate-method-cache! gf) |
7d38f3d8 AW |
1455 | (add-method-in-classes! m) |
1456 | *unspecified*)) | |
14f1d9fe MD |
1457 | |
1458 | (define-generic add-method!) | |
1459 | ||
7d38f3d8 | 1460 | ((method-procedure internal-add-method!) add-method! internal-add-method!) |
14f1d9fe | 1461 | |
71d540f7 | 1462 | (define-method (add-method! (proc <procedure>) (m <method>)) |
14f1d9fe MD |
1463 | (if (generic-capability? proc) |
1464 | (begin | |
1465 | (enable-primitive-generic! proc) | |
1466 | (add-method! proc m)) | |
1467 | (next-method))) | |
1468 | ||
71d540f7 | 1469 | (define-method (add-method! (pg <primitive-generic>) (m <method>)) |
14f1d9fe MD |
1470 | (add-method! (primitive-generic-generic pg) m)) |
1471 | ||
71d540f7 | 1472 | (define-method (add-method! obj (m <method>)) |
14f1d9fe MD |
1473 | (goops-error "~S is not a valid generic function" obj)) |
1474 | ||
1475 | ;;; | |
1476 | ;;; {Access to meta objects} | |
1477 | ;;; | |
1478 | ||
1479 | ;;; | |
1480 | ;;; Methods | |
1481 | ;;; | |
71d540f7 | 1482 | (define-method (method-source (m <method>)) |
14f1d9fe | 1483 | (let* ((spec (map* class-name (slot-ref m 'specializers))) |
4e2f1e9e AW |
1484 | (src (procedure-source (slot-ref m 'procedure)))) |
1485 | (and src | |
1486 | (let ((args (cadr src)) | |
1487 | (body (cddr src))) | |
1488 | (cons 'method | |
1489 | (cons (map* list args spec) | |
1490 | body)))))) | |
1491 | ||
1492 | (define-method (method-formals (m <method>)) | |
1493 | (slot-ref m 'formals)) | |
14f1d9fe MD |
1494 | |
1495 | ;;; | |
1496 | ;;; Slots | |
1497 | ;;; | |
1498 | (define slot-definition-name car) | |
1499 | ||
1500 | (define slot-definition-options cdr) | |
1501 | ||
1502 | (define (slot-definition-allocation s) | |
1503 | (get-keyword #:allocation (cdr s) #:instance)) | |
1504 | ||
1505 | (define (slot-definition-getter s) | |
1506 | (get-keyword #:getter (cdr s) #f)) | |
1507 | ||
1508 | (define (slot-definition-setter s) | |
1509 | (get-keyword #:setter (cdr s) #f)) | |
1510 | ||
1511 | (define (slot-definition-accessor s) | |
1512 | (get-keyword #:accessor (cdr s) #f)) | |
1513 | ||
1514 | (define (slot-definition-init-value s) | |
1515 | ;; can be #f, so we can't use #f as non-value | |
1516 | (get-keyword #:init-value (cdr s) (make-unbound))) | |
1517 | ||
1518 | (define (slot-definition-init-form s) | |
1519 | (get-keyword #:init-form (cdr s) (make-unbound))) | |
1520 | ||
1521 | (define (slot-definition-init-thunk s) | |
1522 | (get-keyword #:init-thunk (cdr s) #f)) | |
1523 | ||
1524 | (define (slot-definition-init-keyword s) | |
1525 | (get-keyword #:init-keyword (cdr s) #f)) | |
1526 | ||
1527 | (define (class-slot-definition class slot-name) | |
1528 | (assq slot-name (class-slots class))) | |
1529 | ||
1530 | (define (slot-init-function class slot-name) | |
1531 | (cadr (assq slot-name (slot-ref class 'getters-n-setters)))) | |
1532 | ||
51f66c91 AW |
1533 | (define (accessor-method-slot-definition obj) |
1534 | "Return the slot definition of the accessor @var{obj}." | |
1535 | (slot-ref obj 'slot-definition)) | |
1536 | ||
14f1d9fe MD |
1537 | |
1538 | ;;; | |
1539 | ;;; {Standard methods used by the C runtime} | |
1540 | ;;; | |
1541 | ||
1542 | ;;; Methods to compare objects | |
1543 | ;;; | |
1544 | ||
9f63ce02 AW |
1545 | ;; Have to do this in a strange order because equal? is used in the |
1546 | ;; add-method! implementation; we need to make sure that when the | |
1547 | ;; primitive is extended, that the generic has a method. = | |
1548 | (define g-equal? (make-generic 'equal?)) | |
1549 | ;; When this generic gets called, we will have already checked eq? and | |
1550 | ;; eqv? -- the purpose of this generic is to extend equality. So by | |
1551 | ;; default, there is no extension, thus the #f return. | |
1552 | (add-method! g-equal? (method (x y) #f)) | |
1553 | (set-primitive-generic! equal? g-equal?) | |
a48d60b1 | 1554 | |
14f1d9fe MD |
1555 | ;;; |
1556 | ;;; methods to display/write an object | |
1557 | ;;; | |
1558 | ||
1559 | ; Code for writing objects must test that the slots they use are | |
1560 | ; bound. Otherwise a slot-unbound method will be called and will | |
1561 | ; conduct to an infinite loop. | |
1562 | ||
1563 | ;; Write | |
1564 | (define (display-address o file) | |
1565 | (display (number->string (object-address o) 16) file)) | |
1566 | ||
71d540f7 | 1567 | (define-method (write o file) |
14f1d9fe MD |
1568 | (display "#<instance " file) |
1569 | (display-address o file) | |
1570 | (display #\> file)) | |
1571 | ||
1572 | (define write-object (primitive-generic-generic write)) | |
1573 | ||
71d540f7 | 1574 | (define-method (write (o <object>) file) |
14f1d9fe MD |
1575 | (let ((class (class-of o))) |
1576 | (if (slot-bound? class 'name) | |
1577 | (begin | |
1578 | (display "#<" file) | |
1579 | (display (class-name class) file) | |
1580 | (display #\space file) | |
1581 | (display-address o file) | |
1582 | (display #\> file)) | |
1583 | (next-method)))) | |
1584 | ||
71d540f7 | 1585 | (define-method (write (class <class>) file) |
14f1d9fe MD |
1586 | (let ((meta (class-of class))) |
1587 | (if (and (slot-bound? class 'name) | |
1588 | (slot-bound? meta 'name)) | |
1589 | (begin | |
1590 | (display "#<" file) | |
1591 | (display (class-name meta) file) | |
1592 | (display #\space file) | |
1593 | (display (class-name class) file) | |
1594 | (display #\space file) | |
1595 | (display-address class file) | |
1596 | (display #\> file)) | |
1597 | (next-method)))) | |
1598 | ||
71d540f7 | 1599 | (define-method (write (gf <generic>) file) |
14f1d9fe MD |
1600 | (let ((meta (class-of gf))) |
1601 | (if (and (slot-bound? meta 'name) | |
1602 | (slot-bound? gf 'methods)) | |
1603 | (begin | |
1604 | (display "#<" file) | |
1605 | (display (class-name meta) file) | |
1606 | (let ((name (generic-function-name gf))) | |
1607 | (if name | |
1608 | (begin | |
1609 | (display #\space file) | |
1610 | (display name file)))) | |
1611 | (display " (" file) | |
1612 | (display (length (generic-function-methods gf)) file) | |
1613 | (display ")>" file)) | |
1614 | (next-method)))) | |
1615 | ||
71d540f7 | 1616 | (define-method (write (o <method>) file) |
14f1d9fe MD |
1617 | (let ((meta (class-of o))) |
1618 | (if (and (slot-bound? meta 'name) | |
1619 | (slot-bound? o 'specializers)) | |
1620 | (begin | |
1621 | (display "#<" file) | |
1622 | (display (class-name meta) file) | |
1623 | (display #\space file) | |
1624 | (display (map* (lambda (spec) | |
1625 | (if (slot-bound? spec 'name) | |
1626 | (slot-ref spec 'name) | |
1627 | spec)) | |
1628 | (method-specializers o)) | |
1629 | file) | |
1630 | (display #\space file) | |
1631 | (display-address o file) | |
1632 | (display #\> file)) | |
1633 | (next-method)))) | |
1634 | ||
1635 | ;; Display (do the same thing as write by default) | |
71d540f7 | 1636 | (define-method (display o file) |
14f1d9fe MD |
1637 | (write-object o file)) |
1638 | ||
7b07e5ef MD |
1639 | ;;; |
1640 | ;;; Handling of duplicate bindings in the module system | |
1641 | ;;; | |
1642 | ||
28d0871b AW |
1643 | (define (find-subclass super name) |
1644 | (let lp ((classes (class-direct-subclasses super))) | |
1645 | (cond | |
1646 | ((null? classes) | |
1647 | (error "class not found" name)) | |
1648 | ((and (slot-bound? (car classes) 'name) | |
1649 | (eq? (class-name (car classes)) name)) | |
1650 | (car classes)) | |
1651 | (else | |
1652 | (lp (cdr classes)))))) | |
1653 | ||
1654 | ;; A record type. | |
1655 | (define <module> (find-subclass <top> '<module>)) | |
1656 | ||
7b07e5ef MD |
1657 | (define-method (merge-generics (module <module>) |
1658 | (name <symbol>) | |
1659 | (int1 <module>) | |
1660 | (val1 <top>) | |
1661 | (int2 <module>) | |
1662 | (val2 <top>) | |
1663 | (var <top>) | |
1664 | (val <top>)) | |
1665 | #f) | |
1666 | ||
1667 | (define-method (merge-generics (module <module>) | |
1668 | (name <symbol>) | |
1669 | (int1 <module>) | |
1670 | (val1 <generic>) | |
1671 | (int2 <module>) | |
1672 | (val2 <generic>) | |
1673 | (var <top>) | |
1674 | (val <boolean>)) | |
c9fa1748 MD |
1675 | (and (not (eq? val1 val2)) |
1676 | (make-variable (make-extended-generic (list val2 val1) name)))) | |
7b07e5ef MD |
1677 | |
1678 | (define-method (merge-generics (module <module>) | |
1679 | (name <symbol>) | |
1680 | (int1 <module>) | |
1681 | (val1 <generic>) | |
1682 | (int2 <module>) | |
1683 | (val2 <generic>) | |
1684 | (var <top>) | |
1685 | (gf <extended-generic>)) | |
c9fa1748 MD |
1686 | (and (not (memq val2 (slot-ref gf 'extends))) |
1687 | (begin | |
1688 | (slot-set! gf | |
1689 | 'extends | |
1690 | (cons val2 (delq! val2 (slot-ref gf 'extends)))) | |
1691 | (slot-set! val2 | |
1692 | 'extended-by | |
1693 | (cons gf (delq! gf (slot-ref val2 'extended-by)))) | |
eddd81f4 | 1694 | (invalidate-method-cache! gf) |
c9fa1748 | 1695 | var))) |
7b07e5ef MD |
1696 | |
1697 | (module-define! duplicate-handlers 'merge-generics merge-generics) | |
1698 | ||
f8af5c6d MD |
1699 | (define-method (merge-accessors (module <module>) |
1700 | (name <symbol>) | |
1701 | (int1 <module>) | |
1702 | (val1 <top>) | |
1703 | (int2 <module>) | |
1704 | (val2 <top>) | |
1705 | (var <top>) | |
1706 | (val <top>)) | |
1707 | #f) | |
1708 | ||
1709 | (define-method (merge-accessors (module <module>) | |
1710 | (name <symbol>) | |
1711 | (int1 <module>) | |
1712 | (val1 <accessor>) | |
1713 | (int2 <module>) | |
1714 | (val2 <accessor>) | |
1715 | (var <top>) | |
1716 | (val <top>)) | |
1717 | (merge-generics module name int1 val1 int2 val2 var val)) | |
1718 | ||
1719 | (module-define! duplicate-handlers 'merge-accessors merge-accessors) | |
1720 | ||
14f1d9fe MD |
1721 | ;;; |
1722 | ;;; slot access | |
1723 | ;;; | |
1724 | ||
1725 | (define (class-slot-g-n-s class slot-name) | |
1726 | (let* ((this-slot (assq slot-name (slot-ref class 'slots))) | |
1727 | (g-n-s (cddr (or (assq slot-name (slot-ref class 'getters-n-setters)) | |
1728 | (slot-missing class slot-name))))) | |
1729 | (if (not (memq (slot-definition-allocation this-slot) | |
1730 | '(#:class #:each-subclass))) | |
1731 | (slot-missing class slot-name)) | |
1732 | g-n-s)) | |
1733 | ||
1734 | (define (class-slot-ref class slot) | |
1735 | (let ((x ((car (class-slot-g-n-s class slot)) #f))) | |
1736 | (if (unbound? x) | |
1737 | (slot-unbound class slot) | |
1738 | x))) | |
1739 | ||
1740 | (define (class-slot-set! class slot value) | |
1741 | ((cadr (class-slot-g-n-s class slot)) #f value)) | |
1742 | ||
71d540f7 | 1743 | (define-method (slot-unbound (c <class>) (o <object>) s) |
14f1d9fe MD |
1744 | (goops-error "Slot `~S' is unbound in object ~S" s o)) |
1745 | ||
71d540f7 | 1746 | (define-method (slot-unbound (c <class>) s) |
14f1d9fe MD |
1747 | (goops-error "Slot `~S' is unbound in class ~S" s c)) |
1748 | ||
71d540f7 | 1749 | (define-method (slot-unbound (o <object>)) |
14f1d9fe MD |
1750 | (goops-error "Unbound slot in object ~S" o)) |
1751 | ||
71d540f7 | 1752 | (define-method (slot-missing (c <class>) (o <object>) s) |
14f1d9fe MD |
1753 | (goops-error "No slot with name `~S' in object ~S" s o)) |
1754 | ||
71d540f7 | 1755 | (define-method (slot-missing (c <class>) s) |
14f1d9fe MD |
1756 | (goops-error "No class slot with name `~S' in class ~S" s c)) |
1757 | ||
1758 | ||
71d540f7 | 1759 | (define-method (slot-missing (c <class>) (o <object>) s value) |
14f1d9fe MD |
1760 | (slot-missing c o s)) |
1761 | ||
1762 | ;;; Methods for the possible error we can encounter when calling a gf | |
1763 | ||
71d540f7 | 1764 | (define-method (no-next-method (gf <generic>) args) |
14f1d9fe MD |
1765 | (goops-error "No next method when calling ~S\nwith arguments ~S" gf args)) |
1766 | ||
71d540f7 | 1767 | (define-method (no-applicable-method (gf <generic>) args) |
14f1d9fe MD |
1768 | (goops-error "No applicable method for ~S in call ~S" |
1769 | gf (cons (generic-function-name gf) args))) | |
1770 | ||
71d540f7 | 1771 | (define-method (no-method (gf <generic>) args) |
14f1d9fe MD |
1772 | (goops-error "No method defined for ~S" gf)) |
1773 | ||
1774 | ;;; | |
1775 | ;;; {Cloning functions (from rdeline@CS.CMU.EDU)} | |
1776 | ;;; | |
1777 | ||
71d540f7 | 1778 | (define-method (shallow-clone (self <object>)) |
14f1d9fe MD |
1779 | (let ((clone (%allocate-instance (class-of self) '())) |
1780 | (slots (map slot-definition-name | |
1781 | (class-slots (class-of self))))) | |
1782 | (for-each (lambda (slot) | |
1783 | (if (slot-bound? self slot) | |
1784 | (slot-set! clone slot (slot-ref self slot)))) | |
1785 | slots) | |
1786 | clone)) | |
1787 | ||
71d540f7 | 1788 | (define-method (deep-clone (self <object>)) |
14f1d9fe MD |
1789 | (let ((clone (%allocate-instance (class-of self) '())) |
1790 | (slots (map slot-definition-name | |
1791 | (class-slots (class-of self))))) | |
1792 | (for-each (lambda (slot) | |
1793 | (if (slot-bound? self slot) | |
1794 | (slot-set! clone slot | |
1795 | (let ((value (slot-ref self slot))) | |
1796 | (if (instance? value) | |
1797 | (deep-clone value) | |
1798 | value))))) | |
1799 | slots) | |
1800 | clone)) | |
1801 | ||
1802 | ;;; | |
1803 | ;;; {Class redefinition utilities} | |
1804 | ;;; | |
1805 | ||
1806 | ;;; (class-redefinition OLD NEW) | |
1807 | ;;; | |
1808 | ||
1809 | ;;; Has correct the following conditions: | |
1810 | ||
1811 | ;;; Methods | |
1812 | ;;; | |
1813 | ;;; 1. New accessor specializers refer to new header | |
1814 | ;;; | |
1815 | ;;; Classes | |
1816 | ;;; | |
1817 | ;;; 1. New class cpl refers to the new class header | |
1818 | ;;; 2. Old class header exists on old super classes direct-subclass lists | |
1819 | ;;; 3. New class header exists on new super classes direct-subclass lists | |
1820 | ||
71d540f7 | 1821 | (define-method (class-redefinition (old <class>) (new <class>)) |
14f1d9fe MD |
1822 | ;; Work on direct methods: |
1823 | ;; 1. Remove accessor methods from the old class | |
1824 | ;; 2. Patch the occurences of new in the specializers by old | |
1825 | ;; 3. Displace the methods from old to new | |
1826 | (remove-class-accessors! old) ;; -1- | |
1827 | (let ((methods (class-direct-methods new))) | |
1828 | (for-each (lambda (m) | |
1829 | (update-direct-method! m new old)) ;; -2- | |
1830 | methods) | |
1831 | (slot-set! new | |
1832 | 'direct-methods | |
1833 | (append methods (class-direct-methods old)))) | |
1834 | ||
1835 | ;; Substitute old for new in new cpl | |
1836 | (set-car! (slot-ref new 'cpl) old) | |
1837 | ||
1838 | ;; Remove the old class from the direct-subclasses list of its super classes | |
1839 | (for-each (lambda (c) (slot-set! c 'direct-subclasses | |
1840 | (delv! old (class-direct-subclasses c)))) | |
1841 | (class-direct-supers old)) | |
1842 | ||
1843 | ;; Replace the new class with the old in the direct-subclasses of the supers | |
1844 | (for-each (lambda (c) | |
1845 | (slot-set! c 'direct-subclasses | |
1846 | (cons old (delv! new (class-direct-subclasses c))))) | |
1847 | (class-direct-supers new)) | |
1848 | ||
1849 | ;; Swap object headers | |
1850 | (%modify-class old new) | |
1851 | ||
1852 | ;; Now old is NEW! | |
1853 | ||
1854 | ;; Redefine all the subclasses of old to take into account modification | |
1855 | (for-each | |
1856 | (lambda (c) | |
1857 | (update-direct-subclass! c new old)) | |
1858 | (class-direct-subclasses new)) | |
1859 | ||
1860 | ;; Invalidate class so that subsequent instances slot accesses invoke | |
1861 | ;; change-object-class | |
1862 | (slot-set! new 'redefined old) | |
1863 | (%invalidate-class new) ;must come after slot-set! | |
1864 | ||
1865 | old) | |
1866 | ||
1867 | ;;; | |
1868 | ;;; remove-class-accessors! | |
1869 | ;;; | |
1870 | ||
71d540f7 | 1871 | (define-method (remove-class-accessors! (c <class>)) |
14f1d9fe MD |
1872 | (for-each (lambda (m) |
1873 | (if (is-a? m <accessor-method>) | |
58241edc MD |
1874 | (let ((gf (slot-ref m 'generic-function))) |
1875 | ;; remove the method from its GF | |
1876 | (slot-set! gf 'methods | |
1877 | (delq1! m (slot-ref gf 'methods))) | |
eddd81f4 | 1878 | (invalidate-method-cache! gf) |
58241edc MD |
1879 | ;; remove the method from its specializers |
1880 | (remove-method-in-classes! m)))) | |
14f1d9fe MD |
1881 | (class-direct-methods c))) |
1882 | ||
1883 | ;;; | |
1884 | ;;; update-direct-method! | |
1885 | ;;; | |
1886 | ||
71d540f7 | 1887 | (define-method (update-direct-method! (m <method>) |
14f1d9fe MD |
1888 | (old <class>) |
1889 | (new <class>)) | |
1890 | (let loop ((l (method-specializers m))) | |
1891 | ;; Note: the <top> in dotted list is never used. | |
1892 | ;; So we can work as if we had only proper lists. | |
1893 | (if (pair? l) | |
1894 | (begin | |
1895 | (if (eqv? (car l) old) | |
1896 | (set-car! l new)) | |
1897 | (loop (cdr l)))))) | |
1898 | ||
1899 | ;;; | |
1900 | ;;; update-direct-subclass! | |
1901 | ;;; | |
1902 | ||
71d540f7 | 1903 | (define-method (update-direct-subclass! (c <class>) |
14f1d9fe MD |
1904 | (old <class>) |
1905 | (new <class>)) | |
1906 | (class-redefinition c | |
1907 | (make-class (class-direct-supers c) | |
1908 | (class-direct-slots c) | |
1909 | #:name (class-name c) | |
14f1d9fe MD |
1910 | #:metaclass (class-of c)))) |
1911 | ||
1912 | ;;; | |
1913 | ;;; {Utilities for INITIALIZE methods} | |
1914 | ;;; | |
1915 | ||
1916 | ;;; compute-slot-accessors | |
1917 | ;;; | |
9d019f9b | 1918 | (define (compute-slot-accessors class slots) |
14f1d9fe MD |
1919 | (for-each |
1920 | (lambda (s g-n-s) | |
a2ca7252 | 1921 | (let ((getter-function (slot-definition-getter s)) |
14f1d9fe MD |
1922 | (setter-function (slot-definition-setter s)) |
1923 | (accessor (slot-definition-accessor s))) | |
1924 | (if getter-function | |
1925 | (add-method! getter-function | |
1926 | (compute-getter-method class g-n-s))) | |
1927 | (if setter-function | |
1928 | (add-method! setter-function | |
1929 | (compute-setter-method class g-n-s))) | |
1930 | (if accessor | |
1931 | (begin | |
1932 | (add-method! accessor | |
1933 | (compute-getter-method class g-n-s)) | |
1934 | (add-method! (setter accessor) | |
1935 | (compute-setter-method class g-n-s)))))) | |
1936 | slots (slot-ref class 'getters-n-setters))) | |
1937 | ||
71d540f7 | 1938 | (define-method (compute-getter-method (class <class>) slotdef) |
14f1d9fe MD |
1939 | (let ((init-thunk (cadr slotdef)) |
1940 | (g-n-s (cddr slotdef))) | |
1941 | (make <accessor-method> | |
1942 | #:specializers (list class) | |
1943 | #:procedure (cond ((pair? g-n-s) | |
58241edc | 1944 | (make-generic-bound-check-getter (car g-n-s))) |
14f1d9fe MD |
1945 | (init-thunk |
1946 | (standard-get g-n-s)) | |
1947 | (else | |
1948 | (bound-check-get g-n-s))) | |
1949 | #:slot-definition slotdef))) | |
1950 | ||
71d540f7 | 1951 | (define-method (compute-setter-method (class <class>) slotdef) |
14f1d9fe MD |
1952 | (let ((g-n-s (cddr slotdef))) |
1953 | (make <accessor-method> | |
1954 | #:specializers (list class <top>) | |
1955 | #:procedure (if (pair? g-n-s) | |
1956 | (cadr g-n-s) | |
1957 | (standard-set g-n-s)) | |
1958 | #:slot-definition slotdef))) | |
1959 | ||
1960 | (define (make-generic-bound-check-getter proc) | |
8397a3a6 | 1961 | (lambda (o) (assert-bound (proc o) o))) |
14f1d9fe | 1962 | |
4d6a7ac6 AW |
1963 | ;;; Pre-generate getters and setters for the first 20 slots. |
1964 | (define-syntax define-standard-accessor-method | |
1965 | (lambda (stx) | |
1966 | (define num-standard-pre-cache 20) | |
1967 | (syntax-case stx () | |
1968 | ((_ ((proc n) arg ...) body) | |
1969 | #`(define proc | |
1970 | (let ((cache (vector #,@(map (lambda (n*) | |
1971 | #`(lambda (arg ...) | |
1972 | (let ((n #,n*)) | |
1973 | body))) | |
1974 | (iota num-standard-pre-cache))))) | |
1975 | (lambda (n) | |
1976 | (if (< n #,num-standard-pre-cache) | |
1977 | (vector-ref cache n) | |
1978 | (lambda (arg ...) body))))))))) | |
abd6af11 AW |
1979 | |
1980 | (define-standard-accessor-method ((bound-check-get n) o) | |
4d6a7ac6 | 1981 | (let ((x (struct-ref o n))) |
abd6af11 | 1982 | (if (unbound? x) |
84012ef4 | 1983 | (slot-unbound o) |
abd6af11 AW |
1984 | x))) |
1985 | ||
1986 | (define-standard-accessor-method ((standard-get n) o) | |
4d6a7ac6 | 1987 | (struct-ref o n)) |
abd6af11 AW |
1988 | |
1989 | (define-standard-accessor-method ((standard-set n) o v) | |
4d6a7ac6 | 1990 | (struct-set! o n v)) |
14f1d9fe MD |
1991 | |
1992 | ;;; compute-getters-n-setters | |
05a6b2d3 | 1993 | ;;; |
9d019f9b | 1994 | (define (compute-getters-n-setters class slots) |
14f1d9fe | 1995 | |
266f3a23 MD |
1996 | (define (compute-slot-init-function name s) |
1997 | (or (let ((thunk (slot-definition-init-thunk s))) | |
1998 | (and thunk | |
314b8716 AW |
1999 | (if (thunk? thunk) |
2000 | thunk | |
2001 | (goops-error "Bad init-thunk for slot `~S' in ~S: ~S" | |
2002 | name class thunk)))) | |
14f1d9fe MD |
2003 | (let ((init (slot-definition-init-value s))) |
2004 | (and (not (unbound? init)) | |
2005 | (lambda () init))))) | |
2006 | ||
2007 | (define (verify-accessors slot l) | |
21ab2aeb MD |
2008 | (cond ((integer? l)) |
2009 | ((not (and (list? l) (= (length l) 2))) | |
2010 | (goops-error "Bad getter and setter for slot `~S' in ~S: ~S" | |
2011 | slot class l)) | |
2012 | (else | |
2013 | (let ((get (car l)) | |
2014 | (set (cadr l))) | |
314b8716 AW |
2015 | (if (not (procedure? get)) |
2016 | (goops-error "Bad getter closure for slot `~S' in ~S: ~S" | |
21ab2aeb | 2017 | slot class get)) |
314b8716 AW |
2018 | (if (not (procedure? set)) |
2019 | (goops-error "Bad setter closure for slot `~S' in ~S: ~S" | |
21ab2aeb | 2020 | slot class set)))))) |
14f1d9fe MD |
2021 | |
2022 | (map (lambda (s) | |
21ab2aeb MD |
2023 | ;; The strange treatment of nfields is due to backward compatibility. |
2024 | (let* ((index (slot-ref class 'nfields)) | |
2025 | (g-n-s (compute-get-n-set class s)) | |
2026 | (size (- (slot-ref class 'nfields) index)) | |
14f1d9fe | 2027 | (name (slot-definition-name s))) |
21ab2aeb MD |
2028 | ;; NOTE: The following is interdependent with C macros |
2029 | ;; defined above goops.c:scm_sys_prep_layout_x. | |
2030 | ;; | |
2031 | ;; For simple instance slots, we have the simplest form | |
2032 | ;; '(name init-function . index) | |
2033 | ;; For other slots we have | |
2034 | ;; '(name init-function getter setter . alloc) | |
2035 | ;; where alloc is: | |
2036 | ;; '(index size) for instance allocated slots | |
2037 | ;; '() for other slots | |
14f1d9fe | 2038 | (verify-accessors name g-n-s) |
5b763233 AW |
2039 | (case (slot-definition-allocation s) |
2040 | ((#:each-subclass #:class) | |
2041 | (unless (and (zero? size) (pair? g-n-s)) | |
2042 | (error "Class-allocated slots should not reserve fields")) | |
2043 | ;; Don't initialize the slot; that's handled when the slot | |
2044 | ;; is allocated, in compute-get-n-set. | |
2045 | (cons name (cons #f g-n-s))) | |
2046 | (else | |
2047 | (cons name | |
2048 | (cons (compute-slot-init-function name s) | |
2049 | (if (or (integer? g-n-s) | |
2050 | (zero? size)) | |
2051 | g-n-s | |
2052 | (append g-n-s (list index size))))))))) | |
14f1d9fe MD |
2053 | slots)) |
2054 | ||
2055 | ;;; compute-cpl | |
2056 | ;;; | |
9167e0b8 AW |
2057 | |
2058 | ;; Replace the bootstrap compute-cpl with this definition. | |
2059 | (define compute-cpl | |
2060 | (make <generic> #:name 'compute-cpl)) | |
14f1d9fe | 2061 | |
71d540f7 | 2062 | (define-method (compute-cpl (class <class>)) |
14f1d9fe MD |
2063 | (compute-std-cpl class class-direct-supers)) |
2064 | ||
14f1d9fe MD |
2065 | ;;; compute-get-n-set |
2066 | ;;; | |
71d540f7 | 2067 | (define-method (compute-get-n-set (class <class>) s) |
5b763233 AW |
2068 | (define (class-slot-init-value) |
2069 | (let ((thunk (slot-definition-init-thunk s))) | |
2070 | (if thunk | |
2071 | (thunk) | |
2072 | (slot-definition-init-value s)))) | |
2073 | ||
14f1d9fe MD |
2074 | (case (slot-definition-allocation s) |
2075 | ((#:instance) ;; Instance slot | |
2076 | ;; get-n-set is just its offset | |
2077 | (let ((already-allocated (slot-ref class 'nfields))) | |
2078 | (slot-set! class 'nfields (+ already-allocated 1)) | |
2079 | already-allocated)) | |
2080 | ||
2081 | ((#:class) ;; Class slot | |
2082 | ;; Class-slots accessors are implemented as 2 closures around | |
2083 | ;; a Scheme variable. As instance slots, class slots must be | |
2084 | ;; unbound at init time. | |
2085 | (let ((name (slot-definition-name s))) | |
2086 | (if (memq name (map slot-definition-name (class-direct-slots class))) | |
2087 | ;; This slot is direct; create a new shared variable | |
5b763233 | 2088 | (make-closure-variable class (class-slot-init-value)) |
14f1d9fe MD |
2089 | ;; Slot is inherited. Find its definition in superclass |
2090 | (let loop ((l (cdr (class-precedence-list class)))) | |
2091 | (let ((r (assoc name (slot-ref (car l) 'getters-n-setters)))) | |
2092 | (if r | |
2093 | (cddr r) | |
2094 | (loop (cdr l)))))))) | |
2095 | ||
2096 | ((#:each-subclass) ;; slot shared by instances of direct subclass. | |
2097 | ;; (Thomas Buerger, April 1998) | |
5b763233 | 2098 | (make-closure-variable class (class-slot-init-value))) |
14f1d9fe MD |
2099 | |
2100 | ((#:virtual) ;; No allocation | |
2101 | ;; slot-ref and slot-set! function must be given by the user | |
2102 | (let ((get (get-keyword #:slot-ref (slot-definition-options s) #f)) | |
a2ca7252 | 2103 | (set (get-keyword #:slot-set! (slot-definition-options s) #f))) |
14f1d9fe | 2104 | (if (not (and get set)) |
3a43b605 | 2105 | (goops-error "You must supply a #:slot-ref and a #:slot-set! in ~S" |
14f1d9fe MD |
2106 | s)) |
2107 | (list get set))) | |
2108 | (else (next-method)))) | |
2109 | ||
5b763233 AW |
2110 | (define (make-closure-variable class value) |
2111 | (list (lambda (o) value) | |
2112 | (lambda (o v) (set! value v)))) | |
14f1d9fe | 2113 | |
71d540f7 | 2114 | (define-method (compute-get-n-set (o <object>) s) |
14f1d9fe MD |
2115 | (goops-error "Allocation \"~S\" is unknown" (slot-definition-allocation s))) |
2116 | ||
71d540f7 | 2117 | (define-method (compute-slots (class <class>)) |
51fd1cd6 AW |
2118 | (build-slots-list (class-direct-slots class) |
2119 | (class-precedence-list class))) | |
14f1d9fe MD |
2120 | |
2121 | ;;; | |
2122 | ;;; {Initialize} | |
2123 | ;;; | |
2124 | ||
71d540f7 | 2125 | (define-method (initialize (object <object>) initargs) |
14f1d9fe MD |
2126 | (%initialize-object object initargs)) |
2127 | ||
71d540f7 | 2128 | (define-method (initialize (class <class>) initargs) |
14f1d9fe MD |
2129 | (next-method) |
2130 | (let ((dslots (get-keyword #:slots initargs '())) | |
9d019f9b | 2131 | (supers (get-keyword #:dsupers initargs '()))) |
14f1d9fe MD |
2132 | (slot-set! class 'name (get-keyword #:name initargs '???)) |
2133 | (slot-set! class 'direct-supers supers) | |
2134 | (slot-set! class 'direct-slots dslots) | |
2135 | (slot-set! class 'direct-subclasses '()) | |
2136 | (slot-set! class 'direct-methods '()) | |
2137 | (slot-set! class 'cpl (compute-cpl class)) | |
2138 | (slot-set! class 'redefined #f) | |
14f1d9fe MD |
2139 | (let ((slots (compute-slots class))) |
2140 | (slot-set! class 'slots slots) | |
2141 | (slot-set! class 'nfields 0) | |
2142 | (slot-set! class 'getters-n-setters (compute-getters-n-setters class | |
9d019f9b | 2143 | slots)) |
14f1d9fe | 2144 | ;; Build getters - setters - accessors |
9d019f9b | 2145 | (compute-slot-accessors class slots)) |
14f1d9fe MD |
2146 | |
2147 | ;; Update the "direct-subclasses" of each inherited classes | |
2148 | (for-each (lambda (x) | |
2149 | (slot-set! x | |
2150 | 'direct-subclasses | |
2151 | (cons class (slot-ref x 'direct-subclasses)))) | |
2152 | supers) | |
2153 | ||
2154 | ;; Support for the underlying structs: | |
2155 | ||
14f1d9fe | 2156 | ;; Set the layout slot |
51f66c91 AW |
2157 | (%prep-layout! class) |
2158 | ;; Inherit class flags (invisible on scheme level) from supers | |
2159 | (%inherit-magic! class supers))) | |
14f1d9fe | 2160 | |
14f1d9fe MD |
2161 | (define (initialize-object-procedure object initargs) |
2162 | (let ((proc (get-keyword #:procedure initargs #f))) | |
2163 | (cond ((not proc)) | |
2164 | ((pair? proc) | |
962b9103 | 2165 | (apply slot-set! object 'procedure proc)) |
14f1d9fe | 2166 | (else |
962b9103 | 2167 | (slot-set! object 'procedure proc))))) |
14f1d9fe | 2168 | |
51f66c91 | 2169 | (define-method (initialize (applicable-struct <applicable-struct>) initargs) |
14f1d9fe | 2170 | (next-method) |
51f66c91 | 2171 | (initialize-object-procedure applicable-struct initargs)) |
14f1d9fe | 2172 | |
6c7dd9eb AW |
2173 | (define-method (initialize (applicable-struct <applicable-struct-with-setter>) |
2174 | initargs) | |
2175 | (next-method) | |
2176 | (slot-set! applicable-struct 'setter (get-keyword #:setter initargs #f))) | |
2177 | ||
71d540f7 | 2178 | (define-method (initialize (generic <generic>) initargs) |
14f1d9fe MD |
2179 | (let ((previous-definition (get-keyword #:default initargs #f)) |
2180 | (name (get-keyword #:name initargs #f))) | |
2181 | (next-method) | |
2182 | (slot-set! generic 'methods (if (is-a? previous-definition <procedure>) | |
7d38f3d8 AW |
2183 | (list (method args |
2184 | (apply previous-definition args))) | |
14f1d9fe MD |
2185 | '())) |
2186 | (if name | |
2187 | (set-procedure-property! generic 'name name)) | |
e0590e7c | 2188 | (invalidate-method-cache! generic))) |
14f1d9fe | 2189 | |
bbf8d523 MD |
2190 | (define-method (initialize (eg <extended-generic>) initargs) |
2191 | (next-method) | |
2192 | (slot-set! eg 'extends (get-keyword #:extends initargs '()))) | |
2193 | ||
b432fb4b MD |
2194 | (define dummy-procedure (lambda args *unspecified*)) |
2195 | ||
71d540f7 | 2196 | (define-method (initialize (method <method>) initargs) |
14f1d9fe MD |
2197 | (next-method) |
2198 | (slot-set! method 'generic-function (get-keyword #:generic-function initargs #f)) | |
2199 | (slot-set! method 'specializers (get-keyword #:specializers initargs '())) | |
b432fb4b | 2200 | (slot-set! method 'procedure |
e177058b | 2201 | (get-keyword #:procedure initargs #f)) |
21497600 AW |
2202 | (slot-set! method 'formals (get-keyword #:formals initargs '())) |
2203 | (slot-set! method 'body (get-keyword #:body initargs '())) | |
e177058b | 2204 | (slot-set! method 'make-procedure (get-keyword #:make-procedure initargs #f))) |
21497600 | 2205 | |
14f1d9fe | 2206 | |
14f1d9fe MD |
2207 | ;;; |
2208 | ;;; {Change-class} | |
2209 | ;;; | |
2210 | ||
2211 | (define (change-object-class old-instance old-class new-class) | |
cc6c7fee | 2212 | (let ((new-instance (allocate-instance new-class '()))) |
8378b269 | 2213 | ;; Initialize the slots of the new instance |
14f1d9fe MD |
2214 | (for-each (lambda (slot) |
2215 | (if (and (slot-exists-using-class? old-class old-instance slot) | |
2216 | (eq? (slot-definition-allocation | |
2217 | (class-slot-definition old-class slot)) | |
2218 | #:instance) | |
2219 | (slot-bound-using-class? old-class old-instance slot)) | |
2220 | ;; Slot was present and allocated in old instance; copy it | |
2221 | (slot-set-using-class! | |
2222 | new-class | |
2223 | new-instance | |
2224 | slot | |
2225 | (slot-ref-using-class old-class old-instance slot)) | |
2226 | ;; slot was absent; initialize it with its default value | |
2227 | (let ((init (slot-init-function new-class slot))) | |
2228 | (if init | |
2229 | (slot-set-using-class! | |
2230 | new-class | |
2231 | new-instance | |
2232 | slot | |
2233 | (apply init '())))))) | |
2234 | (map slot-definition-name (class-slots new-class))) | |
2235 | ;; Exchange old and new instance in place to keep pointers valid | |
2236 | (%modify-instance old-instance new-instance) | |
2237 | ;; Allow class specific updates of instances (which now are swapped) | |
2238 | (update-instance-for-different-class new-instance old-instance) | |
2239 | old-instance)) | |
2240 | ||
2241 | ||
71d540f7 | 2242 | (define-method (update-instance-for-different-class (old-instance <object>) |
14f1d9fe MD |
2243 | (new-instance |
2244 | <object>)) | |
2245 | ;;not really important what we do, we just need a default method | |
2246 | new-instance) | |
2247 | ||
71d540f7 | 2248 | (define-method (change-class (old-instance <object>) (new-class <class>)) |
14f1d9fe MD |
2249 | (change-object-class old-instance (class-of old-instance) new-class)) |
2250 | ||
2251 | ;;; | |
2252 | ;;; {make} | |
2253 | ;;; | |
2254 | ;;; A new definition which overwrites the previous one which was built-in | |
2255 | ;;; | |
2256 | ||
71d540f7 | 2257 | (define-method (allocate-instance (class <class>) initargs) |
14f1d9fe MD |
2258 | (%allocate-instance class initargs)) |
2259 | ||
71d540f7 | 2260 | (define-method (make-instance (class <class>) . initargs) |
14f1d9fe MD |
2261 | (let ((instance (allocate-instance class initargs))) |
2262 | (initialize instance initargs) | |
2263 | instance)) | |
2264 | ||
2265 | (define make make-instance) | |
2266 | ||
2267 | ;;; | |
2268 | ;;; {apply-generic} | |
2269 | ;;; | |
2270 | ;;; Protocol for calling standard generic functions. This protocol is | |
2271 | ;;; not used for real <generic> functions (in this case we use a | |
2272 | ;;; completely C hard-coded protocol). Apply-generic is used by | |
2273 | ;;; goops for calls to subclasses of <generic> and <generic-with-setter>. | |
2274 | ;;; The code below is similar to the first MOP described in AMOP. In | |
2275 | ;;; particular, it doesn't used the currified approach to gf | |
2276 | ;;; call. There are 2 reasons for that: | |
2277 | ;;; - the protocol below is exposed to mimic completely the one written in C | |
2278 | ;;; - the currified protocol would be imho inefficient in C. | |
2279 | ;;; | |
2280 | ||
71d540f7 | 2281 | (define-method (apply-generic (gf <generic>) args) |
14f1d9fe MD |
2282 | (if (null? (slot-ref gf 'methods)) |
2283 | (no-method gf args)) | |
2284 | (let ((methods (compute-applicable-methods gf args))) | |
2285 | (if methods | |
2286 | (apply-methods gf (sort-applicable-methods gf methods args) args) | |
2287 | (no-applicable-method gf args)))) | |
2288 | ||
2289 | ;; compute-applicable-methods is bound to %compute-applicable-methods. | |
2290 | ;; *fixme* use let | |
2291 | (define %%compute-applicable-methods | |
2292 | (make <generic> #:name 'compute-applicable-methods)) | |
2293 | ||
71d540f7 | 2294 | (define-method (%%compute-applicable-methods (gf <generic>) args) |
14f1d9fe MD |
2295 | (%compute-applicable-methods gf args)) |
2296 | ||
2297 | (set! compute-applicable-methods %%compute-applicable-methods) | |
2298 | ||
71d540f7 | 2299 | (define-method (sort-applicable-methods (gf <generic>) methods args) |
c0a56ec7 | 2300 | (%sort-applicable-methods methods (map class-of args))) |
14f1d9fe | 2301 | |
71d540f7 | 2302 | (define-method (method-more-specific? (m1 <method>) (m2 <method>) targs) |
14f1d9fe MD |
2303 | (%method-more-specific? m1 m2 targs)) |
2304 | ||
71d540f7 | 2305 | (define-method (apply-method (gf <generic>) methods build-next args) |
14f1d9fe MD |
2306 | (apply (method-procedure (car methods)) |
2307 | (build-next (cdr methods) args) | |
2308 | args)) | |
2309 | ||
71d540f7 | 2310 | (define-method (apply-methods (gf <generic>) (l <list>) args) |
14f1d9fe MD |
2311 | (letrec ((next (lambda (procs args) |
2312 | (lambda new-args | |
2313 | (let ((a (if (null? new-args) args new-args))) | |
2314 | (if (null? procs) | |
2315 | (no-next-method gf a) | |
2316 | (apply-method gf procs next a))))))) | |
2317 | (apply-method gf l next args))) | |
2318 | ||
2319 | ;; We don't want the following procedure to turn up in backtraces: | |
2320 | (for-each (lambda (proc) | |
2321 | (set-procedure-property! proc 'system-procedure #t)) | |
2322 | (list slot-unbound | |
2323 | slot-missing | |
2324 | no-next-method | |
2325 | no-applicable-method | |
2326 | no-method | |
2327 | )) | |
2328 | ||
2329 | ;;; | |
2330 | ;;; {<composite-metaclass> and <active-metaclass>} | |
2331 | ;;; | |
2332 | ||
2333 | ;(autoload "active-slot" <active-metaclass>) | |
2334 | ;(autoload "composite-slot" <composite-metaclass>) | |
2335 | ;(export <composite-metaclass> <active-metaclass>) | |
2336 | ||
2337 | ;;; | |
2338 | ;;; {Tools} | |
2339 | ;;; | |
2340 | ||
2341 | ;; list2set | |
2342 | ;; | |
2343 | ;; duplicate the standard list->set function but using eq instead of | |
2344 | ;; eqv which really sucks a lot, uselessly here | |
2345 | ;; | |
2346 | (define (list2set l) | |
2347 | (let loop ((l l) | |
2348 | (res '())) | |
2349 | (cond | |
2350 | ((null? l) res) | |
2351 | ((memq (car l) res) (loop (cdr l) res)) | |
2352 | (else (loop (cdr l) (cons (car l) res)))))) | |
2353 | ||
2354 | (define (class-subclasses c) | |
2355 | (letrec ((allsubs (lambda (c) | |
2356 | (cons c (mapappend allsubs | |
2357 | (class-direct-subclasses c)))))) | |
2358 | (list2set (cdr (allsubs c))))) | |
2359 | ||
2360 | (define (class-methods c) | |
2361 | (list2set (mapappend class-direct-methods | |
2362 | (cons c (class-subclasses c))))) | |
2363 | ||
2364 | ;;; | |
2365 | ;;; {Final initialization} | |
2366 | ;;; | |
2367 | ||
2368 | ;; Tell C code that the main bulk of Goops has been loaded | |
2369 | (%goops-loaded) | |
28d0871b AW |
2370 | |
2371 | ||
2372 | \f | |
2373 | ||
2374 | ;;; | |
2375 | ;;; {SMOB and port classes} | |
2376 | ;;; | |
2377 | ||
2378 | (define <arbiter> (find-subclass <top> '<arbiter>)) | |
2379 | (define <promise> (find-subclass <top> '<promise>)) | |
2380 | (define <thread> (find-subclass <top> '<thread>)) | |
2381 | (define <mutex> (find-subclass <top> '<mutex>)) | |
2382 | (define <condition-variable> (find-subclass <top> '<condition-variable>)) | |
2383 | (define <regexp> (find-subclass <top> '<regexp>)) | |
2384 | (define <hook> (find-subclass <top> '<hook>)) | |
2385 | (define <bitvector> (find-subclass <top> '<bitvector>)) | |
2386 | (define <random-state> (find-subclass <top> '<random-state>)) | |
2387 | (define <async> (find-subclass <top> '<async>)) | |
2388 | (define <directory> (find-subclass <top> '<directory>)) | |
28d0871b AW |
2389 | (define <array> (find-subclass <top> '<array>)) |
2390 | (define <character-set> (find-subclass <top> '<character-set>)) | |
2391 | (define <dynamic-object> (find-subclass <top> '<dynamic-object>)) | |
2392 | (define <guardian> (find-subclass <applicable> '<guardian>)) | |
02620dd9 | 2393 | (define <macro> (find-subclass <top> '<macro>)) |
28d0871b AW |
2394 | |
2395 | (define (define-class-subtree class) | |
2396 | (define! (class-name class) class) | |
2397 | (for-each define-class-subtree (class-direct-subclasses class))) | |
2398 | ||
2399 | (define-class-subtree (find-subclass <port> '<file-port>)) |