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14f1d9fe MD |
1 | ;;; installed-scm-file |
2 | ||
6e7d5622 | 3 | ;;;; Copyright (C) 1998,1999,2000,2001,2002, 2003, 2006 Free Software Foundation, Inc. |
14f1d9fe | 4 | ;;;; |
73be1d9e MV |
5 | ;;;; This library is free software; you can redistribute it and/or |
6 | ;;;; modify it under the terms of the GNU Lesser General Public | |
7 | ;;;; License as published by the Free Software Foundation; either | |
8 | ;;;; version 2.1 of the License, or (at your option) any later version. | |
14f1d9fe | 9 | ;;;; |
73be1d9e | 10 | ;;;; This library is distributed in the hope that it will be useful, |
14f1d9fe | 11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | ;;;; Lesser General Public License for more details. | |
14f1d9fe | 14 | ;;;; |
73be1d9e MV |
15 | ;;;; You should have received a copy of the GNU Lesser General Public |
16 | ;;;; License along with this library; if not, write to the Free Software | |
92205699 | 17 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
14f1d9fe MD |
18 | ;;;; |
19 | \f | |
20 | ||
21 | ;;;; This software is a derivative work of other copyrighted softwares; the | |
22 | ;;;; copyright notices of these softwares are placed in the file COPYRIGHTS | |
23 | ;;;; | |
24 | ;;;; This file is based upon stklos.stk from the STk distribution by | |
25 | ;;;; Erick Gallesio <eg@unice.fr>. | |
26 | ;;;; | |
27 | ||
28 | (define-module (oop goops) | |
d31c5d19 | 29 | :use-module (srfi srfi-1) |
f12de0a1 | 30 | :export-syntax (define-class class standard-define-class |
1a179b03 | 31 | define-generic define-accessor define-method |
f595ccfe | 32 | define-extended-generic define-extended-generics |
1a179b03 | 33 | method) |
f7aaa3b3 | 34 | :export (goops-version is-a? class-of |
1a179b03 MD |
35 | ensure-metaclass ensure-metaclass-with-supers |
36 | make-class | |
37 | make-generic ensure-generic | |
bbf8d523 | 38 | make-extended-generic |
1a179b03 | 39 | make-accessor ensure-accessor |
e177058b | 40 | add-method! |
1a179b03 MD |
41 | class-slot-ref class-slot-set! slot-unbound slot-missing |
42 | slot-definition-name slot-definition-options | |
43 | slot-definition-allocation | |
44 | slot-definition-getter slot-definition-setter | |
45 | slot-definition-accessor | |
46 | slot-definition-init-value slot-definition-init-form | |
47 | slot-definition-init-thunk slot-definition-init-keyword | |
48 | slot-init-function class-slot-definition | |
49 | method-source | |
50 | compute-cpl compute-std-cpl compute-get-n-set compute-slots | |
51 | compute-getter-method compute-setter-method | |
52 | allocate-instance initialize make-instance make | |
53 | no-next-method no-applicable-method no-method | |
54 | change-class update-instance-for-different-class | |
55 | shallow-clone deep-clone | |
56 | class-redefinition | |
57 | apply-generic apply-method apply-methods | |
58 | compute-applicable-methods %compute-applicable-methods | |
59 | method-more-specific? sort-applicable-methods | |
60 | class-subclasses class-methods | |
61 | goops-error | |
62 | min-fixnum max-fixnum | |
63 | ;;; *fixme* Should go into goops.c | |
64 | instance? slot-ref-using-class | |
65 | slot-set-using-class! slot-bound-using-class? | |
66 | slot-exists-using-class? slot-ref slot-set! slot-bound? | |
67 | class-name class-direct-supers class-direct-subclasses | |
68 | class-direct-methods class-direct-slots class-precedence-list | |
69 | class-slots class-environment | |
70 | generic-function-name | |
71 | generic-function-methods method-generic-function method-specializers | |
72 | primitive-generic-generic enable-primitive-generic! | |
73 | method-procedure accessor-method-slot-definition | |
74 | slot-exists? make find-method get-keyword) | |
f595ccfe | 75 | :replace (<class> <operator-class> <entity-class> <entity>) |
78ec533c MV |
76 | :no-backtrace) |
77 | ||
ac0e91c4 AW |
78 | (define *goops-module* (current-module)) |
79 | ||
78ec533c | 80 | ;; First initialize the builtin part of GOOPS |
b15dea68 AW |
81 | (eval-when (eval load compile) |
82 | (%init-goops-builtins)) | |
78ec533c MV |
83 | |
84 | ;; Then load the rest of GOOPS | |
85 | (use-modules (oop goops util) | |
86 | (oop goops dispatch) | |
51f7ef47 | 87 | (oop goops compile)) |
14f1d9fe | 88 | |
14f1d9fe | 89 | \f |
b15dea68 | 90 | (eval-when (eval load compile) |
abd6af11 | 91 | (define min-fixnum (- (expt 2 29))) |
b15dea68 | 92 | (define max-fixnum (- (expt 2 29) 1))) |
14f1d9fe MD |
93 | |
94 | ;; | |
95 | ;; goops-error | |
96 | ;; | |
97 | (define (goops-error format-string . args) | |
98 | (save-stack) | |
99 | (scm-error 'goops-error #f format-string args '())) | |
100 | ||
101 | ;; | |
102 | ;; is-a? | |
103 | ;; | |
104 | (define (is-a? obj class) | |
105 | (and (memq class (class-precedence-list (class-of obj))) #t)) | |
106 | ||
107 | ||
108 | ;;; | |
109 | ;;; {Meta classes} | |
110 | ;;; | |
111 | ||
112 | (define ensure-metaclass-with-supers | |
113 | (let ((table-of-metas '())) | |
114 | (lambda (meta-supers) | |
115 | (let ((entry (assoc meta-supers table-of-metas))) | |
116 | (if entry | |
117 | ;; Found a previously created metaclass | |
118 | (cdr entry) | |
119 | ;; Create a new meta-class which inherit from "meta-supers" | |
120 | (let ((new (make <class> #:dsupers meta-supers | |
121 | #:slots '() | |
122 | #:name (gensym "metaclass")))) | |
123 | (set! table-of-metas (cons (cons meta-supers new) table-of-metas)) | |
124 | new)))))) | |
125 | ||
126 | (define (ensure-metaclass supers env) | |
127 | (if (null? supers) | |
128 | <class> | |
129 | (let* ((all-metas (map (lambda (x) (class-of x)) supers)) | |
af35fc20 AW |
130 | (all-cpls (append-map (lambda (m) |
131 | (cdr (class-precedence-list m))) | |
132 | all-metas)) | |
14f1d9fe MD |
133 | (needed-metas '())) |
134 | ;; Find the most specific metaclasses. The new metaclass will be | |
135 | ;; a subclass of these. | |
136 | (for-each | |
137 | (lambda (meta) | |
138 | (if (and (not (member meta all-cpls)) | |
139 | (not (member meta needed-metas))) | |
140 | (set! needed-metas (append needed-metas (list meta))))) | |
141 | all-metas) | |
142 | ;; Now return a subclass of the metaclasses we found. | |
143 | (if (null? (cdr needed-metas)) | |
144 | (car needed-metas) ; If there's only one, just use it. | |
145 | (ensure-metaclass-with-supers needed-metas))))) | |
146 | ||
147 | ;;; | |
148 | ;;; {Classes} | |
149 | ;;; | |
150 | ||
151 | ;;; (define-class NAME (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
152 | ;;; | |
153 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
154 | ;;; OPTION ::= KEYWORD VALUE | |
155 | ;;; | |
d31c5d19 AW |
156 | (define (define-class-pre-definition kw val) |
157 | (case kw | |
14f1d9fe | 158 | ((#:getter #:setter) |
d31c5d19 AW |
159 | `(if (or (not (defined? ',val)) |
160 | (not (is-a? ,val <generic>))) | |
161 | (define-generic ,val))) | |
14f1d9fe | 162 | ((#:accessor) |
d31c5d19 AW |
163 | `(if (or (not (defined? ',val)) |
164 | (not (is-a? ,val <accessor>))) | |
165 | (define-accessor ,val))) | |
14f1d9fe MD |
166 | (else #f))) |
167 | ||
d31c5d19 AW |
168 | (define (kw-do-map mapper f kwargs) |
169 | (define (keywords l) | |
170 | (cond | |
171 | ((null? l) '()) | |
172 | ((or (null? (cdr l)) (not (keyword? (car l)))) | |
173 | (goops-error "malformed keyword arguments: ~a" kwargs)) | |
174 | (else (cons (car l) (keywords (cddr l)))))) | |
175 | (define (args l) | |
176 | (if (null? l) '() (cons (cadr l) (args (cddr l))))) | |
177 | ;; let* to check keywords first | |
178 | (let* ((k (keywords kwargs)) | |
179 | (a (args kwargs))) | |
180 | (mapper f k a))) | |
c31142ee | 181 | |
14f1d9fe MD |
182 | ;;; This code should be implemented in C. |
183 | ;;; | |
d31c5d19 AW |
184 | (define-macro (define-class name supers . slots) |
185 | ;; Some slot options require extra definitions to be made. In | |
186 | ;; particular, we want to make sure that the generic function objects | |
187 | ;; which represent accessors exist before `make-class' tries to add | |
188 | ;; methods to them. | |
189 | ;; | |
190 | ;; Postpone some error handling to class macro. | |
191 | ;; | |
192 | `(begin | |
193 | ;; define accessors | |
194 | ,@(append-map (lambda (slot) | |
195 | (kw-do-map filter-map | |
196 | define-class-pre-definition | |
197 | (if (pair? slot) (cdr slot) '()))) | |
198 | (take-while (lambda (x) (not (keyword? x))) slots)) | |
199 | (if (and (defined? ',name) | |
200 | (is-a? ,name <class>) | |
201 | (memq <object> (class-precedence-list ,name))) | |
202 | (class-redefinition ,name | |
203 | (class ,supers ,@slots #:name ',name)) | |
204 | (define ,name (class ,supers ,@slots #:name ',name))))) | |
14f1d9fe | 205 | |
f12de0a1 | 206 | (define standard-define-class define-class) |
14f1d9fe MD |
207 | |
208 | ;;; (class (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
209 | ;;; | |
210 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
211 | ;;; OPTION ::= KEYWORD VALUE | |
212 | ;;; | |
d31c5d19 AW |
213 | (define-macro (class supers . slots) |
214 | (define (make-slot-definition-forms slots) | |
215 | (map | |
216 | (lambda (def) | |
217 | (cond | |
218 | ((pair? def) | |
219 | `(list ',(car def) | |
220 | ,@(kw-do-map append-map | |
221 | (lambda (kw arg) | |
222 | (case kw | |
223 | ((#:init-form) | |
224 | `(#:init-form ',arg | |
225 | #:init-thunk (lambda () ,arg))) | |
226 | (else (list kw arg)))) | |
227 | (cdr def)))) | |
228 | (else | |
229 | `(list ',def)))) | |
230 | slots)) | |
14f1d9fe | 231 | |
d31c5d19 AW |
232 | (if (not (list? supers)) |
233 | (goops-error "malformed superclass list: ~S" supers)) | |
234 | (let ((slot-defs (cons #f '())) | |
235 | (slots (take-while (lambda (x) (not (keyword? x))) slots)) | |
236 | (options (or (find-tail keyword? slots) '()))) | |
237 | `(make-class | |
238 | ;; evaluate super class variables | |
239 | (list ,@supers) | |
240 | ;; evaluate slot definitions, except the slot name! | |
241 | (list ,@(make-slot-definition-forms slots)) | |
242 | ;; evaluate class options | |
243 | ,@options))) | |
14f1d9fe MD |
244 | |
245 | (define (make-class supers slots . options) | |
246 | (let ((env (or (get-keyword #:environment options #f) | |
247 | (top-level-env)))) | |
248 | (let* ((name (get-keyword #:name options (make-unbound))) | |
249 | (supers (if (not (or-map (lambda (class) | |
250 | (memq <object> | |
251 | (class-precedence-list class))) | |
252 | supers)) | |
253 | (append supers (list <object>)) | |
254 | supers)) | |
255 | (metaclass (or (get-keyword #:metaclass options #f) | |
256 | (ensure-metaclass supers env)))) | |
257 | ||
258 | ;; Verify that all direct slots are different and that we don't inherit | |
259 | ;; several time from the same class | |
260 | (let ((tmp1 (find-duplicate supers)) | |
261 | (tmp2 (find-duplicate (map slot-definition-name slots)))) | |
262 | (if tmp1 | |
263 | (goops-error "make-class: super class ~S is duplicate in class ~S" | |
264 | tmp1 name)) | |
265 | (if tmp2 | |
266 | (goops-error "make-class: slot ~S is duplicate in class ~S" | |
267 | tmp2 name))) | |
268 | ||
269 | ;; Everything seems correct, build the class | |
270 | (apply make metaclass | |
271 | #:dsupers supers | |
272 | #:slots slots | |
273 | #:name name | |
274 | #:environment env | |
275 | options)))) | |
276 | ||
277 | ;;; | |
278 | ;;; {Generic functions and accessors} | |
279 | ;;; | |
280 | ||
1d83f47e AW |
281 | ;; Apparently the desired semantics are that we extend previous |
282 | ;; procedural definitions, but that if `name' was already a generic, we | |
283 | ;; overwrite its definition. | |
284 | (define-macro (define-generic name) | |
285 | (if (not (symbol? name)) | |
286 | (goops-error "bad generic function name: ~S" name)) | |
287 | `(define ,name | |
288 | (if (and (defined? ',name) (is-a? ,name <generic>)) | |
289 | (make <generic> #:name ',name) | |
290 | (ensure-generic (if (defined? ',name) ,name #f) ',name)))) | |
291 | ||
292 | (define-macro (define-extended-generic name val) | |
293 | (if (not (symbol? name)) | |
294 | (goops-error "bad generic function name: ~S" name)) | |
295 | `(define ,name (make-extended-generic ,val ',name))) | |
296 | ||
297 | (define-macro (define-extended-generics names . args) | |
298 | (let ((prefixes (get-keyword #:prefix args #f))) | |
299 | (if prefixes | |
300 | `(begin | |
301 | ,@(map (lambda (name) | |
302 | `(define-extended-generic ,name | |
303 | (list ,@(map (lambda (prefix) | |
304 | (symbol-append prefix name)) | |
305 | prefixes)))) | |
306 | names)) | |
307 | (goops-error "no prefixes supplied")))) | |
bbf8d523 | 308 | |
14f1d9fe MD |
309 | (define (make-generic . name) |
310 | (let ((name (and (pair? name) (car name)))) | |
311 | (make <generic> #:name name))) | |
312 | ||
bbf8d523 MD |
313 | (define (make-extended-generic gfs . name) |
314 | (let* ((name (and (pair? name) (car name))) | |
315 | (gfs (if (pair? gfs) gfs (list gfs))) | |
316 | (gws? (any (lambda (gf) (is-a? gf <generic-with-setter>)) gfs))) | |
317 | (let ((ans (if gws? | |
318 | (let* ((sname (and name (make-setter-name name))) | |
319 | (setters | |
af35fc20 | 320 | (append-map (lambda (gf) |
bbf8d523 MD |
321 | (if (is-a? gf <generic-with-setter>) |
322 | (list (ensure-generic (setter gf) | |
323 | sname)) | |
324 | '())) | |
af35fc20 | 325 | gfs)) |
bbf8d523 MD |
326 | (es (make <extended-generic-with-setter> |
327 | #:name name | |
328 | #:extends gfs | |
329 | #:setter (make <extended-generic> | |
330 | #:name sname | |
331 | #:extends setters)))) | |
332 | (extended-by! setters (setter es)) | |
333 | es) | |
334 | (make <extended-generic> | |
335 | #:name name | |
336 | #:extends gfs)))) | |
337 | (extended-by! gfs ans) | |
338 | ans))) | |
339 | ||
340 | (define (extended-by! gfs eg) | |
341 | (for-each (lambda (gf) | |
342 | (slot-set! gf 'extended-by | |
343 | (cons eg (slot-ref gf 'extended-by)))) | |
344 | gfs)) | |
345 | ||
346 | (define (not-extended-by! gfs eg) | |
347 | (for-each (lambda (gf) | |
348 | (slot-set! gf 'extended-by | |
349 | (delq! eg (slot-ref gf 'extended-by)))) | |
350 | gfs)) | |
351 | ||
14f1d9fe MD |
352 | (define (ensure-generic old-definition . name) |
353 | (let ((name (and (pair? name) (car name)))) | |
354 | (cond ((is-a? old-definition <generic>) old-definition) | |
355 | ((procedure-with-setter? old-definition) | |
356 | (make <generic-with-setter> | |
357 | #:name name | |
358 | #:default (procedure old-definition) | |
359 | #:setter (setter old-definition))) | |
360 | ((procedure? old-definition) | |
361 | (make <generic> #:name name #:default old-definition)) | |
362 | (else (make <generic> #:name name))))) | |
363 | ||
1d83f47e AW |
364 | ;; same semantics as <generic> |
365 | (define-macro (define-accessor name) | |
366 | (if (not (symbol? name)) | |
367 | (goops-error "bad accessor name: ~S" name)) | |
368 | `(define ,name | |
369 | (if (and (defined? ',name) (is-a? ,name <accessor>)) | |
370 | (make <accessor> #:name ',name) | |
371 | (ensure-accessor (if (defined? ',name) ,name #f) ',name)))) | |
c31142ee | 372 | |
14f1d9fe MD |
373 | (define (make-setter-name name) |
374 | (string->symbol (string-append "setter:" (symbol->string name)))) | |
375 | ||
376 | (define (make-accessor . name) | |
377 | (let ((name (and (pair? name) (car name)))) | |
f8af5c6d | 378 | (make <accessor> |
14f1d9fe MD |
379 | #:name name |
380 | #:setter (make <generic> | |
381 | #:name (and name (make-setter-name name)))))) | |
382 | ||
383 | (define (ensure-accessor proc . name) | |
384 | (let ((name (and (pair? name) (car name)))) | |
f8af5c6d MD |
385 | (cond ((and (is-a? proc <accessor>) |
386 | (is-a? (setter proc) <generic>)) | |
387 | proc) | |
388 | ((is-a? proc <generic-with-setter>) | |
389 | (upgrade-accessor proc (setter proc))) | |
14f1d9fe | 390 | ((is-a? proc <generic>) |
f8af5c6d | 391 | (upgrade-accessor proc (make-generic name))) |
14f1d9fe | 392 | ((procedure-with-setter? proc) |
f8af5c6d | 393 | (make <accessor> |
14f1d9fe MD |
394 | #:name name |
395 | #:default (procedure proc) | |
396 | #:setter (ensure-generic (setter proc) name))) | |
397 | ((procedure? proc) | |
398 | (ensure-accessor (ensure-generic proc name) name)) | |
399 | (else | |
400 | (make-accessor name))))) | |
401 | ||
f8af5c6d | 402 | (define (upgrade-accessor generic setter) |
bbf8d523 MD |
403 | (let ((methods (slot-ref generic 'methods)) |
404 | (gws (make (if (is-a? generic <extended-generic>) | |
405 | <extended-generic-with-setter> | |
f8af5c6d | 406 | <accessor>) |
14f1d9fe | 407 | #:name (generic-function-name generic) |
bbf8d523 | 408 | #:extended-by (slot-ref generic 'extended-by) |
14f1d9fe | 409 | #:setter setter))) |
bbf8d523 MD |
410 | (if (is-a? generic <extended-generic>) |
411 | (let ((gfs (slot-ref generic 'extends))) | |
412 | (not-extended-by! gfs generic) | |
413 | (slot-set! gws 'extends gfs) | |
414 | (extended-by! gfs gws))) | |
14f1d9fe MD |
415 | ;; Steal old methods |
416 | (for-each (lambda (method) | |
417 | (slot-set! method 'generic-function gws)) | |
418 | methods) | |
419 | (slot-set! gws 'methods methods) | |
420 | gws)) | |
421 | ||
422 | ;;; | |
423 | ;;; {Methods} | |
424 | ;;; | |
425 | ||
56f952c6 AW |
426 | (define-macro (define-method head . body) |
427 | (if (not (pair? head)) | |
428 | (goops-error "bad method head: ~S" head)) | |
429 | (let ((gf (car head))) | |
430 | (cond ((and (pair? gf) | |
431 | (eq? (car gf) 'setter) | |
432 | (pair? (cdr gf)) | |
433 | (symbol? (cadr gf)) | |
434 | (null? (cddr gf))) | |
435 | ;; named setter method | |
436 | (let ((name (cadr gf))) | |
437 | (cond ((not (symbol? name)) | |
438 | `(add-method! (setter ,name) | |
439 | (method ,(cdr head) ,@body))) | |
440 | (else | |
441 | `(begin | |
442 | (if (or (not (defined? ',name)) | |
443 | (not (is-a? ,name <accessor>))) | |
444 | (define-accessor ,name)) | |
445 | (add-method! (setter ,name) | |
446 | (method ,(cdr head) ,@body))))))) | |
447 | ((not (symbol? gf)) | |
448 | `(add-method! ,gf (method ,(cdr head) ,@body))) | |
449 | (else | |
450 | `(begin | |
451 | ;; FIXME: this code is how it always was, but it's quite | |
452 | ;; cracky: it will only define the generic function if it | |
453 | ;; was undefined before (ok), or *was defined to #f*. The | |
454 | ;; latter is crack. But there are bootstrap issues about | |
455 | ;; fixing this -- change it to (is-a? ,gf <generic>) and | |
456 | ;; see. | |
457 | (if (or (not (defined? ',gf)) | |
458 | (not ,gf)) | |
459 | (define-generic ,gf)) | |
460 | (add-method! ,gf | |
461 | (method ,(cdr head) ,@body))))))) | |
14f1d9fe | 462 | |
02e720ff | 463 | (define-macro (method args . body) |
14f1d9fe MD |
464 | (letrec ((specializers |
465 | (lambda (ls) | |
27b32aad | 466 | (cond ((null? ls) (list (list 'quote '()))) |
14f1d9fe MD |
467 | ((pair? ls) (cons (if (pair? (car ls)) |
468 | (cadar ls) | |
469 | '<top>) | |
470 | (specializers (cdr ls)))) | |
471 | (else '(<top>))))) | |
472 | (formals | |
473 | (lambda (ls) | |
474 | (if (pair? ls) | |
475 | (cons (if (pair? (car ls)) (caar ls) (car ls)) | |
476 | (formals (cdr ls))) | |
477 | ls)))) | |
e177058b AW |
478 | (let ((make-proc (compile-make-procedure (formals args) |
479 | (specializers args) | |
480 | body))) | |
481 | `(make <method> | |
482 | #:specializers (cons* ,@(specializers args)) | |
483 | #:formals ',(formals args) | |
484 | #:body ',body | |
485 | #:make-procedure ,make-proc | |
486 | #:procedure ,(and (not make-proc) | |
487 | ;; that is to say: we set #:procedure if | |
488 | ;; `compile-make-procedure' returned `#f', | |
489 | ;; which is the case if `body' does not | |
490 | ;; contain a call to `next-method' | |
491 | `(lambda ,(formals args) | |
492 | ,@(if (null? body) | |
493 | '((begin)) | |
494 | body))))))) | |
14f1d9fe MD |
495 | |
496 | ;;; | |
497 | ;;; {add-method!} | |
498 | ;;; | |
499 | ||
500 | (define (add-method-in-classes! m) | |
501 | ;; Add method in all the classes which appears in its specializers list | |
502 | (for-each* (lambda (x) | |
503 | (let ((dm (class-direct-methods x))) | |
81600208 | 504 | (if (not (memq m dm)) |
14f1d9fe MD |
505 | (slot-set! x 'direct-methods (cons m dm))))) |
506 | (method-specializers m))) | |
507 | ||
508 | (define (remove-method-in-classes! m) | |
509 | ;; Remove method in all the classes which appears in its specializers list | |
510 | (for-each* (lambda (x) | |
511 | (slot-set! x | |
512 | 'direct-methods | |
513 | (delv! m (class-direct-methods x)))) | |
514 | (method-specializers m))) | |
515 | ||
516 | (define (compute-new-list-of-methods gf new) | |
517 | (let ((new-spec (method-specializers new)) | |
bbf8d523 | 518 | (methods (slot-ref gf 'methods))) |
14f1d9fe MD |
519 | (let loop ((l methods)) |
520 | (if (null? l) | |
521 | (cons new methods) | |
522 | (if (equal? (method-specializers (car l)) new-spec) | |
523 | (begin | |
524 | ;; This spec. list already exists. Remove old method from dependents | |
525 | (remove-method-in-classes! (car l)) | |
526 | (set-car! l new) | |
527 | methods) | |
528 | (loop (cdr l))))))) | |
529 | ||
7d38f3d8 AW |
530 | (define internal-add-method! |
531 | (method ((gf <generic>) (m <method>)) | |
532 | (slot-set! m 'generic-function gf) | |
533 | (slot-set! gf 'methods (compute-new-list-of-methods gf m)) | |
534 | (let ((specializers (slot-ref m 'specializers))) | |
535 | (slot-set! gf 'n-specialized | |
536 | (max (length* specializers) | |
537 | (slot-ref gf 'n-specialized)))) | |
538 | (%invalidate-method-cache! gf) | |
539 | (add-method-in-classes! m) | |
540 | *unspecified*)) | |
14f1d9fe MD |
541 | |
542 | (define-generic add-method!) | |
543 | ||
7d38f3d8 | 544 | ((method-procedure internal-add-method!) add-method! internal-add-method!) |
14f1d9fe | 545 | |
71d540f7 | 546 | (define-method (add-method! (proc <procedure>) (m <method>)) |
14f1d9fe MD |
547 | (if (generic-capability? proc) |
548 | (begin | |
549 | (enable-primitive-generic! proc) | |
550 | (add-method! proc m)) | |
551 | (next-method))) | |
552 | ||
71d540f7 | 553 | (define-method (add-method! (pg <primitive-generic>) (m <method>)) |
14f1d9fe MD |
554 | (add-method! (primitive-generic-generic pg) m)) |
555 | ||
71d540f7 | 556 | (define-method (add-method! obj (m <method>)) |
14f1d9fe MD |
557 | (goops-error "~S is not a valid generic function" obj)) |
558 | ||
559 | ;;; | |
560 | ;;; {Access to meta objects} | |
561 | ;;; | |
562 | ||
563 | ;;; | |
564 | ;;; Methods | |
565 | ;;; | |
71d540f7 | 566 | (define-method (method-source (m <method>)) |
14f1d9fe MD |
567 | (let* ((spec (map* class-name (slot-ref m 'specializers))) |
568 | (proc (procedure-source (slot-ref m 'procedure))) | |
569 | (args (cadr proc)) | |
570 | (body (cddr proc))) | |
571 | (cons 'method | |
572 | (cons (map* list args spec) | |
573 | body)))) | |
574 | ||
575 | ;;; | |
576 | ;;; Slots | |
577 | ;;; | |
578 | (define slot-definition-name car) | |
579 | ||
580 | (define slot-definition-options cdr) | |
581 | ||
582 | (define (slot-definition-allocation s) | |
583 | (get-keyword #:allocation (cdr s) #:instance)) | |
584 | ||
585 | (define (slot-definition-getter s) | |
586 | (get-keyword #:getter (cdr s) #f)) | |
587 | ||
588 | (define (slot-definition-setter s) | |
589 | (get-keyword #:setter (cdr s) #f)) | |
590 | ||
591 | (define (slot-definition-accessor s) | |
592 | (get-keyword #:accessor (cdr s) #f)) | |
593 | ||
594 | (define (slot-definition-init-value s) | |
595 | ;; can be #f, so we can't use #f as non-value | |
596 | (get-keyword #:init-value (cdr s) (make-unbound))) | |
597 | ||
598 | (define (slot-definition-init-form s) | |
599 | (get-keyword #:init-form (cdr s) (make-unbound))) | |
600 | ||
601 | (define (slot-definition-init-thunk s) | |
602 | (get-keyword #:init-thunk (cdr s) #f)) | |
603 | ||
604 | (define (slot-definition-init-keyword s) | |
605 | (get-keyword #:init-keyword (cdr s) #f)) | |
606 | ||
607 | (define (class-slot-definition class slot-name) | |
608 | (assq slot-name (class-slots class))) | |
609 | ||
610 | (define (slot-init-function class slot-name) | |
611 | (cadr (assq slot-name (slot-ref class 'getters-n-setters)))) | |
612 | ||
613 | ||
614 | ;;; | |
615 | ;;; {Standard methods used by the C runtime} | |
616 | ;;; | |
617 | ||
618 | ;;; Methods to compare objects | |
619 | ;;; | |
620 | ||
47cd67db MD |
621 | (define-method (eqv? x y) #f) |
622 | (define-method (equal? x y) (eqv? x y)) | |
a48d60b1 | 623 | |
14f1d9fe MD |
624 | ;;; |
625 | ;;; methods to display/write an object | |
626 | ;;; | |
627 | ||
628 | ; Code for writing objects must test that the slots they use are | |
629 | ; bound. Otherwise a slot-unbound method will be called and will | |
630 | ; conduct to an infinite loop. | |
631 | ||
632 | ;; Write | |
633 | (define (display-address o file) | |
634 | (display (number->string (object-address o) 16) file)) | |
635 | ||
71d540f7 | 636 | (define-method (write o file) |
14f1d9fe MD |
637 | (display "#<instance " file) |
638 | (display-address o file) | |
639 | (display #\> file)) | |
640 | ||
641 | (define write-object (primitive-generic-generic write)) | |
642 | ||
71d540f7 | 643 | (define-method (write (o <object>) file) |
14f1d9fe MD |
644 | (let ((class (class-of o))) |
645 | (if (slot-bound? class 'name) | |
646 | (begin | |
647 | (display "#<" file) | |
648 | (display (class-name class) file) | |
649 | (display #\space file) | |
650 | (display-address o file) | |
651 | (display #\> file)) | |
652 | (next-method)))) | |
653 | ||
71d540f7 | 654 | (define-method (write (o <foreign-object>) file) |
14f1d9fe MD |
655 | (let ((class (class-of o))) |
656 | (if (slot-bound? class 'name) | |
657 | (begin | |
658 | (display "#<foreign-object " file) | |
659 | (display (class-name class) file) | |
660 | (display #\space file) | |
661 | (display-address o file) | |
662 | (display #\> file)) | |
663 | (next-method)))) | |
664 | ||
71d540f7 | 665 | (define-method (write (class <class>) file) |
14f1d9fe MD |
666 | (let ((meta (class-of class))) |
667 | (if (and (slot-bound? class 'name) | |
668 | (slot-bound? meta 'name)) | |
669 | (begin | |
670 | (display "#<" file) | |
671 | (display (class-name meta) file) | |
672 | (display #\space file) | |
673 | (display (class-name class) file) | |
674 | (display #\space file) | |
675 | (display-address class file) | |
676 | (display #\> file)) | |
677 | (next-method)))) | |
678 | ||
71d540f7 | 679 | (define-method (write (gf <generic>) file) |
14f1d9fe MD |
680 | (let ((meta (class-of gf))) |
681 | (if (and (slot-bound? meta 'name) | |
682 | (slot-bound? gf 'methods)) | |
683 | (begin | |
684 | (display "#<" file) | |
685 | (display (class-name meta) file) | |
686 | (let ((name (generic-function-name gf))) | |
687 | (if name | |
688 | (begin | |
689 | (display #\space file) | |
690 | (display name file)))) | |
691 | (display " (" file) | |
692 | (display (length (generic-function-methods gf)) file) | |
693 | (display ")>" file)) | |
694 | (next-method)))) | |
695 | ||
71d540f7 | 696 | (define-method (write (o <method>) file) |
14f1d9fe MD |
697 | (let ((meta (class-of o))) |
698 | (if (and (slot-bound? meta 'name) | |
699 | (slot-bound? o 'specializers)) | |
700 | (begin | |
701 | (display "#<" file) | |
702 | (display (class-name meta) file) | |
703 | (display #\space file) | |
704 | (display (map* (lambda (spec) | |
705 | (if (slot-bound? spec 'name) | |
706 | (slot-ref spec 'name) | |
707 | spec)) | |
708 | (method-specializers o)) | |
709 | file) | |
710 | (display #\space file) | |
711 | (display-address o file) | |
712 | (display #\> file)) | |
713 | (next-method)))) | |
714 | ||
715 | ;; Display (do the same thing as write by default) | |
71d540f7 | 716 | (define-method (display o file) |
14f1d9fe MD |
717 | (write-object o file)) |
718 | ||
7b07e5ef MD |
719 | ;;; |
720 | ;;; Handling of duplicate bindings in the module system | |
721 | ;;; | |
722 | ||
723 | (define-method (merge-generics (module <module>) | |
724 | (name <symbol>) | |
725 | (int1 <module>) | |
726 | (val1 <top>) | |
727 | (int2 <module>) | |
728 | (val2 <top>) | |
729 | (var <top>) | |
730 | (val <top>)) | |
731 | #f) | |
732 | ||
733 | (define-method (merge-generics (module <module>) | |
734 | (name <symbol>) | |
735 | (int1 <module>) | |
736 | (val1 <generic>) | |
737 | (int2 <module>) | |
738 | (val2 <generic>) | |
739 | (var <top>) | |
740 | (val <boolean>)) | |
c9fa1748 MD |
741 | (and (not (eq? val1 val2)) |
742 | (make-variable (make-extended-generic (list val2 val1) name)))) | |
7b07e5ef MD |
743 | |
744 | (define-method (merge-generics (module <module>) | |
745 | (name <symbol>) | |
746 | (int1 <module>) | |
747 | (val1 <generic>) | |
748 | (int2 <module>) | |
749 | (val2 <generic>) | |
750 | (var <top>) | |
751 | (gf <extended-generic>)) | |
c9fa1748 MD |
752 | (and (not (memq val2 (slot-ref gf 'extends))) |
753 | (begin | |
754 | (slot-set! gf | |
755 | 'extends | |
756 | (cons val2 (delq! val2 (slot-ref gf 'extends)))) | |
757 | (slot-set! val2 | |
758 | 'extended-by | |
759 | (cons gf (delq! gf (slot-ref val2 'extended-by)))) | |
760 | var))) | |
7b07e5ef MD |
761 | |
762 | (module-define! duplicate-handlers 'merge-generics merge-generics) | |
763 | ||
f8af5c6d MD |
764 | (define-method (merge-accessors (module <module>) |
765 | (name <symbol>) | |
766 | (int1 <module>) | |
767 | (val1 <top>) | |
768 | (int2 <module>) | |
769 | (val2 <top>) | |
770 | (var <top>) | |
771 | (val <top>)) | |
772 | #f) | |
773 | ||
774 | (define-method (merge-accessors (module <module>) | |
775 | (name <symbol>) | |
776 | (int1 <module>) | |
777 | (val1 <accessor>) | |
778 | (int2 <module>) | |
779 | (val2 <accessor>) | |
780 | (var <top>) | |
781 | (val <top>)) | |
782 | (merge-generics module name int1 val1 int2 val2 var val)) | |
783 | ||
784 | (module-define! duplicate-handlers 'merge-accessors merge-accessors) | |
785 | ||
14f1d9fe MD |
786 | ;;; |
787 | ;;; slot access | |
788 | ;;; | |
789 | ||
790 | (define (class-slot-g-n-s class slot-name) | |
791 | (let* ((this-slot (assq slot-name (slot-ref class 'slots))) | |
792 | (g-n-s (cddr (or (assq slot-name (slot-ref class 'getters-n-setters)) | |
793 | (slot-missing class slot-name))))) | |
794 | (if (not (memq (slot-definition-allocation this-slot) | |
795 | '(#:class #:each-subclass))) | |
796 | (slot-missing class slot-name)) | |
797 | g-n-s)) | |
798 | ||
799 | (define (class-slot-ref class slot) | |
800 | (let ((x ((car (class-slot-g-n-s class slot)) #f))) | |
801 | (if (unbound? x) | |
802 | (slot-unbound class slot) | |
803 | x))) | |
804 | ||
805 | (define (class-slot-set! class slot value) | |
806 | ((cadr (class-slot-g-n-s class slot)) #f value)) | |
807 | ||
71d540f7 | 808 | (define-method (slot-unbound (c <class>) (o <object>) s) |
14f1d9fe MD |
809 | (goops-error "Slot `~S' is unbound in object ~S" s o)) |
810 | ||
71d540f7 | 811 | (define-method (slot-unbound (c <class>) s) |
14f1d9fe MD |
812 | (goops-error "Slot `~S' is unbound in class ~S" s c)) |
813 | ||
71d540f7 | 814 | (define-method (slot-unbound (o <object>)) |
14f1d9fe MD |
815 | (goops-error "Unbound slot in object ~S" o)) |
816 | ||
71d540f7 | 817 | (define-method (slot-missing (c <class>) (o <object>) s) |
14f1d9fe MD |
818 | (goops-error "No slot with name `~S' in object ~S" s o)) |
819 | ||
71d540f7 | 820 | (define-method (slot-missing (c <class>) s) |
14f1d9fe MD |
821 | (goops-error "No class slot with name `~S' in class ~S" s c)) |
822 | ||
823 | ||
71d540f7 | 824 | (define-method (slot-missing (c <class>) (o <object>) s value) |
14f1d9fe MD |
825 | (slot-missing c o s)) |
826 | ||
827 | ;;; Methods for the possible error we can encounter when calling a gf | |
828 | ||
71d540f7 | 829 | (define-method (no-next-method (gf <generic>) args) |
14f1d9fe MD |
830 | (goops-error "No next method when calling ~S\nwith arguments ~S" gf args)) |
831 | ||
71d540f7 | 832 | (define-method (no-applicable-method (gf <generic>) args) |
14f1d9fe MD |
833 | (goops-error "No applicable method for ~S in call ~S" |
834 | gf (cons (generic-function-name gf) args))) | |
835 | ||
71d540f7 | 836 | (define-method (no-method (gf <generic>) args) |
14f1d9fe MD |
837 | (goops-error "No method defined for ~S" gf)) |
838 | ||
839 | ;;; | |
840 | ;;; {Cloning functions (from rdeline@CS.CMU.EDU)} | |
841 | ;;; | |
842 | ||
71d540f7 | 843 | (define-method (shallow-clone (self <object>)) |
14f1d9fe MD |
844 | (let ((clone (%allocate-instance (class-of self) '())) |
845 | (slots (map slot-definition-name | |
846 | (class-slots (class-of self))))) | |
847 | (for-each (lambda (slot) | |
848 | (if (slot-bound? self slot) | |
849 | (slot-set! clone slot (slot-ref self slot)))) | |
850 | slots) | |
851 | clone)) | |
852 | ||
71d540f7 | 853 | (define-method (deep-clone (self <object>)) |
14f1d9fe MD |
854 | (let ((clone (%allocate-instance (class-of self) '())) |
855 | (slots (map slot-definition-name | |
856 | (class-slots (class-of self))))) | |
857 | (for-each (lambda (slot) | |
858 | (if (slot-bound? self slot) | |
859 | (slot-set! clone slot | |
860 | (let ((value (slot-ref self slot))) | |
861 | (if (instance? value) | |
862 | (deep-clone value) | |
863 | value))))) | |
864 | slots) | |
865 | clone)) | |
866 | ||
867 | ;;; | |
868 | ;;; {Class redefinition utilities} | |
869 | ;;; | |
870 | ||
871 | ;;; (class-redefinition OLD NEW) | |
872 | ;;; | |
873 | ||
874 | ;;; Has correct the following conditions: | |
875 | ||
876 | ;;; Methods | |
877 | ;;; | |
878 | ;;; 1. New accessor specializers refer to new header | |
879 | ;;; | |
880 | ;;; Classes | |
881 | ;;; | |
882 | ;;; 1. New class cpl refers to the new class header | |
883 | ;;; 2. Old class header exists on old super classes direct-subclass lists | |
884 | ;;; 3. New class header exists on new super classes direct-subclass lists | |
885 | ||
71d540f7 | 886 | (define-method (class-redefinition (old <class>) (new <class>)) |
14f1d9fe MD |
887 | ;; Work on direct methods: |
888 | ;; 1. Remove accessor methods from the old class | |
889 | ;; 2. Patch the occurences of new in the specializers by old | |
890 | ;; 3. Displace the methods from old to new | |
891 | (remove-class-accessors! old) ;; -1- | |
892 | (let ((methods (class-direct-methods new))) | |
893 | (for-each (lambda (m) | |
894 | (update-direct-method! m new old)) ;; -2- | |
895 | methods) | |
896 | (slot-set! new | |
897 | 'direct-methods | |
898 | (append methods (class-direct-methods old)))) | |
899 | ||
900 | ;; Substitute old for new in new cpl | |
901 | (set-car! (slot-ref new 'cpl) old) | |
902 | ||
903 | ;; Remove the old class from the direct-subclasses list of its super classes | |
904 | (for-each (lambda (c) (slot-set! c 'direct-subclasses | |
905 | (delv! old (class-direct-subclasses c)))) | |
906 | (class-direct-supers old)) | |
907 | ||
908 | ;; Replace the new class with the old in the direct-subclasses of the supers | |
909 | (for-each (lambda (c) | |
910 | (slot-set! c 'direct-subclasses | |
911 | (cons old (delv! new (class-direct-subclasses c))))) | |
912 | (class-direct-supers new)) | |
913 | ||
914 | ;; Swap object headers | |
915 | (%modify-class old new) | |
916 | ||
917 | ;; Now old is NEW! | |
918 | ||
919 | ;; Redefine all the subclasses of old to take into account modification | |
920 | (for-each | |
921 | (lambda (c) | |
922 | (update-direct-subclass! c new old)) | |
923 | (class-direct-subclasses new)) | |
924 | ||
925 | ;; Invalidate class so that subsequent instances slot accesses invoke | |
926 | ;; change-object-class | |
927 | (slot-set! new 'redefined old) | |
928 | (%invalidate-class new) ;must come after slot-set! | |
929 | ||
930 | old) | |
931 | ||
932 | ;;; | |
933 | ;;; remove-class-accessors! | |
934 | ;;; | |
935 | ||
71d540f7 | 936 | (define-method (remove-class-accessors! (c <class>)) |
14f1d9fe MD |
937 | (for-each (lambda (m) |
938 | (if (is-a? m <accessor-method>) | |
58241edc MD |
939 | (let ((gf (slot-ref m 'generic-function))) |
940 | ;; remove the method from its GF | |
941 | (slot-set! gf 'methods | |
942 | (delq1! m (slot-ref gf 'methods))) | |
943 | (%invalidate-method-cache! gf) | |
944 | ;; remove the method from its specializers | |
945 | (remove-method-in-classes! m)))) | |
14f1d9fe MD |
946 | (class-direct-methods c))) |
947 | ||
948 | ;;; | |
949 | ;;; update-direct-method! | |
950 | ;;; | |
951 | ||
71d540f7 | 952 | (define-method (update-direct-method! (m <method>) |
14f1d9fe MD |
953 | (old <class>) |
954 | (new <class>)) | |
955 | (let loop ((l (method-specializers m))) | |
956 | ;; Note: the <top> in dotted list is never used. | |
957 | ;; So we can work as if we had only proper lists. | |
958 | (if (pair? l) | |
959 | (begin | |
960 | (if (eqv? (car l) old) | |
961 | (set-car! l new)) | |
962 | (loop (cdr l)))))) | |
963 | ||
964 | ;;; | |
965 | ;;; update-direct-subclass! | |
966 | ;;; | |
967 | ||
71d540f7 | 968 | (define-method (update-direct-subclass! (c <class>) |
14f1d9fe MD |
969 | (old <class>) |
970 | (new <class>)) | |
971 | (class-redefinition c | |
972 | (make-class (class-direct-supers c) | |
973 | (class-direct-slots c) | |
974 | #:name (class-name c) | |
975 | #:environment (slot-ref c 'environment) | |
976 | #:metaclass (class-of c)))) | |
977 | ||
978 | ;;; | |
979 | ;;; {Utilities for INITIALIZE methods} | |
980 | ;;; | |
981 | ||
982 | ;;; compute-slot-accessors | |
983 | ;;; | |
984 | (define (compute-slot-accessors class slots env) | |
985 | (for-each | |
986 | (lambda (s g-n-s) | |
987 | (let ((name (slot-definition-name s)) | |
988 | (getter-function (slot-definition-getter s)) | |
989 | (setter-function (slot-definition-setter s)) | |
990 | (accessor (slot-definition-accessor s))) | |
991 | (if getter-function | |
992 | (add-method! getter-function | |
993 | (compute-getter-method class g-n-s))) | |
994 | (if setter-function | |
995 | (add-method! setter-function | |
996 | (compute-setter-method class g-n-s))) | |
997 | (if accessor | |
998 | (begin | |
999 | (add-method! accessor | |
1000 | (compute-getter-method class g-n-s)) | |
1001 | (add-method! (setter accessor) | |
1002 | (compute-setter-method class g-n-s)))))) | |
1003 | slots (slot-ref class 'getters-n-setters))) | |
1004 | ||
71d540f7 | 1005 | (define-method (compute-getter-method (class <class>) slotdef) |
14f1d9fe MD |
1006 | (let ((init-thunk (cadr slotdef)) |
1007 | (g-n-s (cddr slotdef))) | |
1008 | (make <accessor-method> | |
1009 | #:specializers (list class) | |
1010 | #:procedure (cond ((pair? g-n-s) | |
58241edc | 1011 | (make-generic-bound-check-getter (car g-n-s))) |
14f1d9fe MD |
1012 | (init-thunk |
1013 | (standard-get g-n-s)) | |
1014 | (else | |
1015 | (bound-check-get g-n-s))) | |
1016 | #:slot-definition slotdef))) | |
1017 | ||
71d540f7 | 1018 | (define-method (compute-setter-method (class <class>) slotdef) |
14f1d9fe MD |
1019 | (let ((g-n-s (cddr slotdef))) |
1020 | (make <accessor-method> | |
1021 | #:specializers (list class <top>) | |
1022 | #:procedure (if (pair? g-n-s) | |
1023 | (cadr g-n-s) | |
1024 | (standard-set g-n-s)) | |
1025 | #:slot-definition slotdef))) | |
1026 | ||
1027 | (define (make-generic-bound-check-getter proc) | |
1028 | (let ((source (and (closure? proc) (procedure-source proc)))) | |
1029 | (if (and source (null? (cdddr source))) | |
1030 | (let ((obj (caadr source))) | |
1031 | ;; smart closure compilation | |
1032 | (local-eval | |
1033 | `(lambda (,obj) (,assert-bound ,(caddr source) ,obj)) | |
1034 | (procedure-environment proc))) | |
1035 | (lambda (o) (assert-bound (proc o) o))))) | |
1036 | ||
5192c9e8 AW |
1037 | ;; the idea is to compile the index into the procedure, for fastest |
1038 | ;; lookup. Also, @slot-ref and @slot-set! have their own bytecodes. | |
ac0e91c4 | 1039 | |
b15dea68 | 1040 | (eval-when (compile) |
ca445ba5 | 1041 | (use-modules ((language scheme compile-ghil) :select (define-scheme-translator)) |
abd6af11 | 1042 | ((language ghil) :select (make-ghil-inline make-ghil-call)) |
5192c9e8 AW |
1043 | (system base pmatch)) |
1044 | ||
1045 | ;; unfortunately, can't use define-inline because these are primitive | |
1046 | ;; syntaxen. | |
1047 | (define-scheme-translator @slot-ref | |
1048 | ((,obj ,index) (guard (integer? index) | |
1049 | (>= index 0) (< index max-fixnum)) | |
1050 | (make-ghil-inline #f #f 'slot-ref | |
abd6af11 AW |
1051 | (list (retrans obj) (retrans index)))) |
1052 | (else | |
1053 | (make-ghil-call e l (retrans (car exp)) (map retrans (cdr exp))))) | |
5192c9e8 AW |
1054 | |
1055 | (define-scheme-translator @slot-set! | |
1056 | ((,obj ,index ,val) (guard (integer? index) | |
1057 | (>= index 0) (< index max-fixnum)) | |
1058 | (make-ghil-inline #f #f 'slot-set | |
abd6af11 AW |
1059 | (list (retrans obj) (retrans index) (retrans val)))) |
1060 | (else | |
b15dea68 | 1061 | (make-ghil-call e l (retrans (car exp)) (map retrans (cdr exp)))))) |
abd6af11 | 1062 | |
b15dea68 AW |
1063 | (eval-when (eval load compile) |
1064 | (define num-standard-pre-cache 20)) | |
abd6af11 AW |
1065 | |
1066 | (define-macro (define-standard-accessor-method form . body) | |
1067 | (let ((name (caar form)) | |
1068 | (n-var (cadar form)) | |
1069 | (args (cdr form))) | |
1070 | (define (make-one x) | |
1071 | (define (body-trans form) | |
1072 | (cond ((not (pair? form)) form) | |
1073 | ((eq? (car form) '@slot-ref) | |
1074 | `(,(car form) ,(cadr form) ,x)) | |
1075 | ((eq? (car form) '@slot-set!) | |
1076 | `(,(car form) ,(cadr form) ,x ,(cadddr form))) | |
1077 | (else | |
1078 | (map body-trans form)))) | |
1079 | `(lambda ,args ,@(map body-trans body))) | |
1080 | `(define ,name | |
1081 | (let ((cache (vector ,@(map make-one (iota num-standard-pre-cache))))) | |
1082 | (lambda (n) | |
1083 | (if (< n ,num-standard-pre-cache) | |
1084 | (vector-ref cache n) | |
1085 | ((lambda (,n-var) (lambda ,args ,@body)) n))))))) | |
1086 | ||
1087 | (define-standard-accessor-method ((bound-check-get n) o) | |
1088 | (let ((x (@slot-ref o n))) | |
1089 | (if (unbound? x) | |
1090 | (slot-unbound obj) | |
1091 | x))) | |
1092 | ||
1093 | (define-standard-accessor-method ((standard-get n) o) | |
1094 | (@slot-ref o n)) | |
1095 | ||
1096 | (define-standard-accessor-method ((standard-set n) o v) | |
1097 | (@slot-set! o n v)) | |
14f1d9fe MD |
1098 | |
1099 | ;;; compute-getters-n-setters | |
05a6b2d3 MD |
1100 | ;;; |
1101 | (define (make-thunk thunk) | |
1102 | (lambda () (thunk))) | |
1103 | ||
14f1d9fe MD |
1104 | (define (compute-getters-n-setters class slots env) |
1105 | ||
266f3a23 MD |
1106 | (define (compute-slot-init-function name s) |
1107 | (or (let ((thunk (slot-definition-init-thunk s))) | |
1108 | (and thunk | |
05a6b2d3 MD |
1109 | (cond ((not (thunk? thunk)) |
1110 | (goops-error "Bad init-thunk for slot `~S' in ~S: ~S" | |
1111 | name class thunk)) | |
1112 | ((closure? thunk) thunk) | |
1113 | (else (make-thunk thunk))))) | |
14f1d9fe MD |
1114 | (let ((init (slot-definition-init-value s))) |
1115 | (and (not (unbound? init)) | |
1116 | (lambda () init))))) | |
1117 | ||
1118 | (define (verify-accessors slot l) | |
21ab2aeb MD |
1119 | (cond ((integer? l)) |
1120 | ((not (and (list? l) (= (length l) 2))) | |
1121 | (goops-error "Bad getter and setter for slot `~S' in ~S: ~S" | |
1122 | slot class l)) | |
1123 | (else | |
1124 | (let ((get (car l)) | |
1125 | (set (cadr l))) | |
4631414e AW |
1126 | ;; note that we allow non-closures; we only check arity on |
1127 | ;; the closures, though, because we inline their dispatch | |
1128 | ;; in %get-slot-value / %set-slot-value. | |
1129 | (if (or (not (procedure? get)) | |
1130 | (and (closure? get) | |
1131 | (not (= (car (procedure-property get 'arity)) 1)))) | |
21ab2aeb MD |
1132 | (goops-error "Bad getter closure for slot `~S' in ~S: ~S" |
1133 | slot class get)) | |
4631414e AW |
1134 | (if (or (not (procedure? set)) |
1135 | (and (closure? set) | |
1136 | (not (= (car (procedure-property set 'arity)) 2)))) | |
21ab2aeb MD |
1137 | (goops-error "Bad setter closure for slot `~S' in ~S: ~S" |
1138 | slot class set)))))) | |
14f1d9fe MD |
1139 | |
1140 | (map (lambda (s) | |
21ab2aeb MD |
1141 | ;; The strange treatment of nfields is due to backward compatibility. |
1142 | (let* ((index (slot-ref class 'nfields)) | |
1143 | (g-n-s (compute-get-n-set class s)) | |
1144 | (size (- (slot-ref class 'nfields) index)) | |
14f1d9fe | 1145 | (name (slot-definition-name s))) |
21ab2aeb MD |
1146 | ;; NOTE: The following is interdependent with C macros |
1147 | ;; defined above goops.c:scm_sys_prep_layout_x. | |
1148 | ;; | |
1149 | ;; For simple instance slots, we have the simplest form | |
1150 | ;; '(name init-function . index) | |
1151 | ;; For other slots we have | |
1152 | ;; '(name init-function getter setter . alloc) | |
1153 | ;; where alloc is: | |
1154 | ;; '(index size) for instance allocated slots | |
1155 | ;; '() for other slots | |
14f1d9fe MD |
1156 | (verify-accessors name g-n-s) |
1157 | (cons name | |
266f3a23 | 1158 | (cons (compute-slot-init-function name s) |
21ab2aeb MD |
1159 | (if (or (integer? g-n-s) |
1160 | (zero? size)) | |
1161 | g-n-s | |
e1ac894c | 1162 | (append g-n-s (list index size))))))) |
14f1d9fe MD |
1163 | slots)) |
1164 | ||
1165 | ;;; compute-cpl | |
1166 | ;;; | |
1167 | ;;; Correct behaviour: | |
1168 | ;;; | |
1169 | ;;; (define-class food ()) | |
1170 | ;;; (define-class fruit (food)) | |
1171 | ;;; (define-class spice (food)) | |
1172 | ;;; (define-class apple (fruit)) | |
1173 | ;;; (define-class cinnamon (spice)) | |
1174 | ;;; (define-class pie (apple cinnamon)) | |
1175 | ;;; => cpl (pie) = pie apple fruit cinnamon spice food object top | |
1176 | ;;; | |
1177 | ;;; (define-class d ()) | |
1178 | ;;; (define-class e ()) | |
1179 | ;;; (define-class f ()) | |
1180 | ;;; (define-class b (d e)) | |
1181 | ;;; (define-class c (e f)) | |
1182 | ;;; (define-class a (b c)) | |
1183 | ;;; => cpl (a) = a b d c e f object top | |
1184 | ;;; | |
1185 | ||
71d540f7 | 1186 | (define-method (compute-cpl (class <class>)) |
14f1d9fe MD |
1187 | (compute-std-cpl class class-direct-supers)) |
1188 | ||
1189 | ;; Support | |
1190 | ||
1191 | (define (only-non-null lst) | |
1192 | (filter (lambda (l) (not (null? l))) lst)) | |
1193 | ||
1194 | (define (compute-std-cpl c get-direct-supers) | |
1195 | (let ((c-direct-supers (get-direct-supers c))) | |
1196 | (merge-lists (list c) | |
1197 | (only-non-null (append (map class-precedence-list | |
1198 | c-direct-supers) | |
1199 | (list c-direct-supers)))))) | |
1200 | ||
1201 | (define (merge-lists reversed-partial-result inputs) | |
1202 | (cond | |
1203 | ((every null? inputs) | |
1204 | (reverse! reversed-partial-result)) | |
1205 | (else | |
1206 | (let* ((candidate (lambda (c) | |
1207 | (and (not (any (lambda (l) | |
1208 | (memq c (cdr l))) | |
1209 | inputs)) | |
1210 | c))) | |
1211 | (candidate-car (lambda (l) | |
1212 | (and (not (null? l)) | |
1213 | (candidate (car l))))) | |
1214 | (next (any candidate-car inputs))) | |
1215 | (if (not next) | |
1216 | (goops-error "merge-lists: Inconsistent precedence graph")) | |
1217 | (let ((remove-next (lambda (l) | |
1218 | (if (eq? (car l) next) | |
1219 | (cdr l) | |
1220 | l)))) | |
1221 | (merge-lists (cons next reversed-partial-result) | |
1222 | (only-non-null (map remove-next inputs)))))))) | |
1223 | ||
1224 | ;; Modified from TinyClos: | |
1225 | ;; | |
1226 | ;; A simple topological sort. | |
1227 | ;; | |
1228 | ;; It's in this file so that both TinyClos and Objects can use it. | |
1229 | ;; | |
1230 | ;; This is a fairly modified version of code I originally got from Anurag | |
1231 | ;; Mendhekar <anurag@moose.cs.indiana.edu>. | |
1232 | ;; | |
1233 | ||
1234 | (define (compute-clos-cpl c get-direct-supers) | |
1235 | (top-sort ((build-transitive-closure get-direct-supers) c) | |
1236 | ((build-constraints get-direct-supers) c) | |
1237 | (std-tie-breaker get-direct-supers))) | |
1238 | ||
1239 | ||
1240 | (define (top-sort elements constraints tie-breaker) | |
1241 | (let loop ((elements elements) | |
1242 | (constraints constraints) | |
1243 | (result '())) | |
1244 | (if (null? elements) | |
1245 | result | |
1246 | (let ((can-go-in-now | |
1247 | (filter | |
1248 | (lambda (x) | |
1249 | (every (lambda (constraint) | |
1250 | (or (not (eq? (cadr constraint) x)) | |
1251 | (memq (car constraint) result))) | |
1252 | constraints)) | |
1253 | elements))) | |
1254 | (if (null? can-go-in-now) | |
1255 | (goops-error "top-sort: Invalid constraints") | |
1256 | (let ((choice (if (null? (cdr can-go-in-now)) | |
1257 | (car can-go-in-now) | |
1258 | (tie-breaker result | |
1259 | can-go-in-now)))) | |
1260 | (loop | |
1261 | (filter (lambda (x) (not (eq? x choice))) | |
b0dff018 | 1262 | elements) |
14f1d9fe MD |
1263 | constraints |
1264 | (append result (list choice))))))))) | |
1265 | ||
1266 | (define (std-tie-breaker get-supers) | |
1267 | (lambda (partial-cpl min-elts) | |
1268 | (let loop ((pcpl (reverse partial-cpl))) | |
1269 | (let ((current-elt (car pcpl))) | |
1270 | (let ((ds-of-ce (get-supers current-elt))) | |
1271 | (let ((common (filter (lambda (x) | |
1272 | (memq x ds-of-ce)) | |
1273 | min-elts))) | |
1274 | (if (null? common) | |
1275 | (if (null? (cdr pcpl)) | |
1276 | (goops-error "std-tie-breaker: Nothing valid") | |
1277 | (loop (cdr pcpl))) | |
1278 | (car common)))))))) | |
1279 | ||
1280 | ||
1281 | (define (build-transitive-closure get-follow-ons) | |
1282 | (lambda (x) | |
1283 | (let track ((result '()) | |
1284 | (pending (list x))) | |
1285 | (if (null? pending) | |
1286 | result | |
1287 | (let ((next (car pending))) | |
1288 | (if (memq next result) | |
1289 | (track result (cdr pending)) | |
1290 | (track (cons next result) | |
1291 | (append (get-follow-ons next) | |
1292 | (cdr pending))))))))) | |
1293 | ||
1294 | (define (build-constraints get-follow-ons) | |
1295 | (lambda (x) | |
1296 | (let loop ((elements ((build-transitive-closure get-follow-ons) x)) | |
1297 | (this-one '()) | |
1298 | (result '())) | |
1299 | (if (or (null? this-one) (null? (cdr this-one))) | |
1300 | (if (null? elements) | |
1301 | result | |
1302 | (loop (cdr elements) | |
1303 | (cons (car elements) | |
1304 | (get-follow-ons (car elements))) | |
1305 | result)) | |
1306 | (loop elements | |
1307 | (cdr this-one) | |
1308 | (cons (list (car this-one) (cadr this-one)) | |
1309 | result)))))) | |
1310 | ||
1311 | ;;; compute-get-n-set | |
1312 | ;;; | |
71d540f7 | 1313 | (define-method (compute-get-n-set (class <class>) s) |
14f1d9fe MD |
1314 | (case (slot-definition-allocation s) |
1315 | ((#:instance) ;; Instance slot | |
1316 | ;; get-n-set is just its offset | |
1317 | (let ((already-allocated (slot-ref class 'nfields))) | |
1318 | (slot-set! class 'nfields (+ already-allocated 1)) | |
1319 | already-allocated)) | |
1320 | ||
1321 | ((#:class) ;; Class slot | |
1322 | ;; Class-slots accessors are implemented as 2 closures around | |
1323 | ;; a Scheme variable. As instance slots, class slots must be | |
1324 | ;; unbound at init time. | |
1325 | (let ((name (slot-definition-name s))) | |
1326 | (if (memq name (map slot-definition-name (class-direct-slots class))) | |
1327 | ;; This slot is direct; create a new shared variable | |
1328 | (make-closure-variable class) | |
1329 | ;; Slot is inherited. Find its definition in superclass | |
1330 | (let loop ((l (cdr (class-precedence-list class)))) | |
1331 | (let ((r (assoc name (slot-ref (car l) 'getters-n-setters)))) | |
1332 | (if r | |
1333 | (cddr r) | |
1334 | (loop (cdr l)))))))) | |
1335 | ||
1336 | ((#:each-subclass) ;; slot shared by instances of direct subclass. | |
1337 | ;; (Thomas Buerger, April 1998) | |
1338 | (make-closure-variable class)) | |
1339 | ||
1340 | ((#:virtual) ;; No allocation | |
1341 | ;; slot-ref and slot-set! function must be given by the user | |
1342 | (let ((get (get-keyword #:slot-ref (slot-definition-options s) #f)) | |
1343 | (set (get-keyword #:slot-set! (slot-definition-options s) #f)) | |
1344 | (env (class-environment class))) | |
1345 | (if (not (and get set)) | |
3a43b605 | 1346 | (goops-error "You must supply a #:slot-ref and a #:slot-set! in ~S" |
14f1d9fe MD |
1347 | s)) |
1348 | (list get set))) | |
1349 | (else (next-method)))) | |
1350 | ||
1351 | (define (make-closure-variable class) | |
1352 | (let ((shared-variable (make-unbound))) | |
1353 | (list (lambda (o) shared-variable) | |
1354 | (lambda (o v) (set! shared-variable v))))) | |
1355 | ||
71d540f7 | 1356 | (define-method (compute-get-n-set (o <object>) s) |
14f1d9fe MD |
1357 | (goops-error "Allocation \"~S\" is unknown" (slot-definition-allocation s))) |
1358 | ||
71d540f7 | 1359 | (define-method (compute-slots (class <class>)) |
14f1d9fe MD |
1360 | (%compute-slots class)) |
1361 | ||
1362 | ;;; | |
1363 | ;;; {Initialize} | |
1364 | ;;; | |
1365 | ||
71d540f7 | 1366 | (define-method (initialize (object <object>) initargs) |
14f1d9fe MD |
1367 | (%initialize-object object initargs)) |
1368 | ||
71d540f7 | 1369 | (define-method (initialize (class <class>) initargs) |
14f1d9fe MD |
1370 | (next-method) |
1371 | (let ((dslots (get-keyword #:slots initargs '())) | |
1372 | (supers (get-keyword #:dsupers initargs '())) | |
1373 | (env (get-keyword #:environment initargs (top-level-env)))) | |
1374 | ||
1375 | (slot-set! class 'name (get-keyword #:name initargs '???)) | |
1376 | (slot-set! class 'direct-supers supers) | |
1377 | (slot-set! class 'direct-slots dslots) | |
1378 | (slot-set! class 'direct-subclasses '()) | |
1379 | (slot-set! class 'direct-methods '()) | |
1380 | (slot-set! class 'cpl (compute-cpl class)) | |
1381 | (slot-set! class 'redefined #f) | |
1382 | (slot-set! class 'environment env) | |
1383 | (let ((slots (compute-slots class))) | |
1384 | (slot-set! class 'slots slots) | |
1385 | (slot-set! class 'nfields 0) | |
1386 | (slot-set! class 'getters-n-setters (compute-getters-n-setters class | |
1387 | slots | |
1388 | env)) | |
1389 | ;; Build getters - setters - accessors | |
1390 | (compute-slot-accessors class slots env)) | |
1391 | ||
1392 | ;; Update the "direct-subclasses" of each inherited classes | |
1393 | (for-each (lambda (x) | |
1394 | (slot-set! x | |
1395 | 'direct-subclasses | |
1396 | (cons class (slot-ref x 'direct-subclasses)))) | |
1397 | supers) | |
1398 | ||
1399 | ;; Support for the underlying structs: | |
1400 | ||
1401 | ;; Inherit class flags (invisible on scheme level) from supers | |
1402 | (%inherit-magic! class supers) | |
1403 | ||
1404 | ;; Set the layout slot | |
1405 | (%prep-layout! class))) | |
1406 | ||
14f1d9fe MD |
1407 | (define (initialize-object-procedure object initargs) |
1408 | (let ((proc (get-keyword #:procedure initargs #f))) | |
1409 | (cond ((not proc)) | |
1410 | ((pair? proc) | |
1411 | (apply set-object-procedure! object proc)) | |
a524a03f | 1412 | ((valid-object-procedure? proc) |
14f1d9fe MD |
1413 | (set-object-procedure! object proc)) |
1414 | (else | |
1415 | (set-object-procedure! object | |
1416 | (lambda args (apply proc args))))))) | |
1417 | ||
71d540f7 | 1418 | (define-method (initialize (class <operator-class>) initargs) |
14f1d9fe MD |
1419 | (next-method) |
1420 | (initialize-object-procedure class initargs)) | |
1421 | ||
71d540f7 | 1422 | (define-method (initialize (owsc <operator-with-setter-class>) initargs) |
14f1d9fe MD |
1423 | (next-method) |
1424 | (%set-object-setter! owsc (get-keyword #:setter initargs #f))) | |
1425 | ||
71d540f7 | 1426 | (define-method (initialize (entity <entity>) initargs) |
14f1d9fe MD |
1427 | (next-method) |
1428 | (initialize-object-procedure entity initargs)) | |
1429 | ||
71d540f7 | 1430 | (define-method (initialize (ews <entity-with-setter>) initargs) |
14f1d9fe MD |
1431 | (next-method) |
1432 | (%set-object-setter! ews (get-keyword #:setter initargs #f))) | |
1433 | ||
71d540f7 | 1434 | (define-method (initialize (generic <generic>) initargs) |
14f1d9fe MD |
1435 | (let ((previous-definition (get-keyword #:default initargs #f)) |
1436 | (name (get-keyword #:name initargs #f))) | |
1437 | (next-method) | |
1438 | (slot-set! generic 'methods (if (is-a? previous-definition <procedure>) | |
7d38f3d8 AW |
1439 | (list (method args |
1440 | (apply previous-definition args))) | |
14f1d9fe MD |
1441 | '())) |
1442 | (if name | |
1443 | (set-procedure-property! generic 'name name)) | |
1444 | )) | |
1445 | ||
bbf8d523 MD |
1446 | (define-method (initialize (eg <extended-generic>) initargs) |
1447 | (next-method) | |
1448 | (slot-set! eg 'extends (get-keyword #:extends initargs '()))) | |
1449 | ||
b432fb4b MD |
1450 | (define dummy-procedure (lambda args *unspecified*)) |
1451 | ||
71d540f7 | 1452 | (define-method (initialize (method <method>) initargs) |
14f1d9fe MD |
1453 | (next-method) |
1454 | (slot-set! method 'generic-function (get-keyword #:generic-function initargs #f)) | |
1455 | (slot-set! method 'specializers (get-keyword #:specializers initargs '())) | |
b432fb4b | 1456 | (slot-set! method 'procedure |
e177058b | 1457 | (get-keyword #:procedure initargs #f)) |
21497600 AW |
1458 | (slot-set! method 'code-table '()) |
1459 | (slot-set! method 'formals (get-keyword #:formals initargs '())) | |
1460 | (slot-set! method 'body (get-keyword #:body initargs '())) | |
e177058b | 1461 | (slot-set! method 'make-procedure (get-keyword #:make-procedure initargs #f))) |
21497600 | 1462 | |
14f1d9fe | 1463 | |
71d540f7 | 1464 | (define-method (initialize (obj <foreign-object>) initargs)) |
14f1d9fe MD |
1465 | |
1466 | ;;; | |
1467 | ;;; {Change-class} | |
1468 | ;;; | |
1469 | ||
1470 | (define (change-object-class old-instance old-class new-class) | |
cc6c7fee | 1471 | (let ((new-instance (allocate-instance new-class '()))) |
8378b269 | 1472 | ;; Initialize the slots of the new instance |
14f1d9fe MD |
1473 | (for-each (lambda (slot) |
1474 | (if (and (slot-exists-using-class? old-class old-instance slot) | |
1475 | (eq? (slot-definition-allocation | |
1476 | (class-slot-definition old-class slot)) | |
1477 | #:instance) | |
1478 | (slot-bound-using-class? old-class old-instance slot)) | |
1479 | ;; Slot was present and allocated in old instance; copy it | |
1480 | (slot-set-using-class! | |
1481 | new-class | |
1482 | new-instance | |
1483 | slot | |
1484 | (slot-ref-using-class old-class old-instance slot)) | |
1485 | ;; slot was absent; initialize it with its default value | |
1486 | (let ((init (slot-init-function new-class slot))) | |
1487 | (if init | |
1488 | (slot-set-using-class! | |
1489 | new-class | |
1490 | new-instance | |
1491 | slot | |
1492 | (apply init '())))))) | |
1493 | (map slot-definition-name (class-slots new-class))) | |
1494 | ;; Exchange old and new instance in place to keep pointers valid | |
1495 | (%modify-instance old-instance new-instance) | |
1496 | ;; Allow class specific updates of instances (which now are swapped) | |
1497 | (update-instance-for-different-class new-instance old-instance) | |
1498 | old-instance)) | |
1499 | ||
1500 | ||
71d540f7 | 1501 | (define-method (update-instance-for-different-class (old-instance <object>) |
14f1d9fe MD |
1502 | (new-instance |
1503 | <object>)) | |
1504 | ;;not really important what we do, we just need a default method | |
1505 | new-instance) | |
1506 | ||
71d540f7 | 1507 | (define-method (change-class (old-instance <object>) (new-class <class>)) |
14f1d9fe MD |
1508 | (change-object-class old-instance (class-of old-instance) new-class)) |
1509 | ||
1510 | ;;; | |
1511 | ;;; {make} | |
1512 | ;;; | |
1513 | ;;; A new definition which overwrites the previous one which was built-in | |
1514 | ;;; | |
1515 | ||
71d540f7 | 1516 | (define-method (allocate-instance (class <class>) initargs) |
14f1d9fe MD |
1517 | (%allocate-instance class initargs)) |
1518 | ||
71d540f7 | 1519 | (define-method (make-instance (class <class>) . initargs) |
14f1d9fe MD |
1520 | (let ((instance (allocate-instance class initargs))) |
1521 | (initialize instance initargs) | |
1522 | instance)) | |
1523 | ||
1524 | (define make make-instance) | |
1525 | ||
1526 | ;;; | |
1527 | ;;; {apply-generic} | |
1528 | ;;; | |
1529 | ;;; Protocol for calling standard generic functions. This protocol is | |
1530 | ;;; not used for real <generic> functions (in this case we use a | |
1531 | ;;; completely C hard-coded protocol). Apply-generic is used by | |
1532 | ;;; goops for calls to subclasses of <generic> and <generic-with-setter>. | |
1533 | ;;; The code below is similar to the first MOP described in AMOP. In | |
1534 | ;;; particular, it doesn't used the currified approach to gf | |
1535 | ;;; call. There are 2 reasons for that: | |
1536 | ;;; - the protocol below is exposed to mimic completely the one written in C | |
1537 | ;;; - the currified protocol would be imho inefficient in C. | |
1538 | ;;; | |
1539 | ||
71d540f7 | 1540 | (define-method (apply-generic (gf <generic>) args) |
14f1d9fe MD |
1541 | (if (null? (slot-ref gf 'methods)) |
1542 | (no-method gf args)) | |
1543 | (let ((methods (compute-applicable-methods gf args))) | |
1544 | (if methods | |
1545 | (apply-methods gf (sort-applicable-methods gf methods args) args) | |
1546 | (no-applicable-method gf args)))) | |
1547 | ||
1548 | ;; compute-applicable-methods is bound to %compute-applicable-methods. | |
1549 | ;; *fixme* use let | |
1550 | (define %%compute-applicable-methods | |
1551 | (make <generic> #:name 'compute-applicable-methods)) | |
1552 | ||
71d540f7 | 1553 | (define-method (%%compute-applicable-methods (gf <generic>) args) |
14f1d9fe MD |
1554 | (%compute-applicable-methods gf args)) |
1555 | ||
1556 | (set! compute-applicable-methods %%compute-applicable-methods) | |
1557 | ||
71d540f7 | 1558 | (define-method (sort-applicable-methods (gf <generic>) methods args) |
14f1d9fe MD |
1559 | (let ((targs (map class-of args))) |
1560 | (sort methods (lambda (m1 m2) (method-more-specific? m1 m2 targs))))) | |
1561 | ||
71d540f7 | 1562 | (define-method (method-more-specific? (m1 <method>) (m2 <method>) targs) |
14f1d9fe MD |
1563 | (%method-more-specific? m1 m2 targs)) |
1564 | ||
71d540f7 | 1565 | (define-method (apply-method (gf <generic>) methods build-next args) |
14f1d9fe MD |
1566 | (apply (method-procedure (car methods)) |
1567 | (build-next (cdr methods) args) | |
1568 | args)) | |
1569 | ||
71d540f7 | 1570 | (define-method (apply-methods (gf <generic>) (l <list>) args) |
14f1d9fe MD |
1571 | (letrec ((next (lambda (procs args) |
1572 | (lambda new-args | |
1573 | (let ((a (if (null? new-args) args new-args))) | |
1574 | (if (null? procs) | |
1575 | (no-next-method gf a) | |
1576 | (apply-method gf procs next a))))))) | |
1577 | (apply-method gf l next args))) | |
1578 | ||
1579 | ;; We don't want the following procedure to turn up in backtraces: | |
1580 | (for-each (lambda (proc) | |
1581 | (set-procedure-property! proc 'system-procedure #t)) | |
1582 | (list slot-unbound | |
1583 | slot-missing | |
1584 | no-next-method | |
1585 | no-applicable-method | |
1586 | no-method | |
1587 | )) | |
1588 | ||
1589 | ;;; | |
1590 | ;;; {<composite-metaclass> and <active-metaclass>} | |
1591 | ;;; | |
1592 | ||
1593 | ;(autoload "active-slot" <active-metaclass>) | |
1594 | ;(autoload "composite-slot" <composite-metaclass>) | |
1595 | ;(export <composite-metaclass> <active-metaclass>) | |
1596 | ||
1597 | ;;; | |
1598 | ;;; {Tools} | |
1599 | ;;; | |
1600 | ||
1601 | ;; list2set | |
1602 | ;; | |
1603 | ;; duplicate the standard list->set function but using eq instead of | |
1604 | ;; eqv which really sucks a lot, uselessly here | |
1605 | ;; | |
1606 | (define (list2set l) | |
1607 | (let loop ((l l) | |
1608 | (res '())) | |
1609 | (cond | |
1610 | ((null? l) res) | |
1611 | ((memq (car l) res) (loop (cdr l) res)) | |
1612 | (else (loop (cdr l) (cons (car l) res)))))) | |
1613 | ||
1614 | (define (class-subclasses c) | |
1615 | (letrec ((allsubs (lambda (c) | |
1616 | (cons c (mapappend allsubs | |
1617 | (class-direct-subclasses c)))))) | |
1618 | (list2set (cdr (allsubs c))))) | |
1619 | ||
1620 | (define (class-methods c) | |
1621 | (list2set (mapappend class-direct-methods | |
1622 | (cons c (class-subclasses c))))) | |
1623 | ||
1624 | ;;; | |
1625 | ;;; {Final initialization} | |
1626 | ;;; | |
1627 | ||
1628 | ;; Tell C code that the main bulk of Goops has been loaded | |
1629 | (%goops-loaded) |