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1 | ;;;; goops.scm -- The Guile Object-Oriented Programming System |
2 | ;;;; | |
3 | ;;;; Copyright (C) 1998-2003,2006,2009-2011,2013-2015 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) |
ac5185c2 AW |
30 | #:use-module ((language tree-il primitives) |
31 | :select (add-interesting-primitive!)) | |
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! | |
8dfc0ba5 | 100 | class-slot-ref class-slot-set! slot-unbound slot-missing |
28d0871b AW |
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 | |
8dfc0ba5 | 107 | slot-definition-init-thunk slot-definition-init-keyword |
28d0871b AW |
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 | |
8dfc0ba5 | 123 | |
2bcb278a AW |
124 | instance? |
125 | slot-ref slot-set! slot-bound? slot-exists? | |
28d0871b AW |
126 | class-name class-direct-supers class-direct-subclasses |
127 | class-direct-methods class-direct-slots class-precedence-list | |
128 | class-slots | |
129 | generic-function-name | |
130 | generic-function-methods method-generic-function | |
131 | method-specializers method-formals | |
132 | primitive-generic-generic enable-primitive-generic! | |
133 | method-procedure accessor-method-slot-definition | |
3f4829e0 | 134 | make find-method get-keyword)) |
78ec533c | 135 | |
9647d3d3 AW |
136 | |
137 | ;;; | |
138 | ;;; Booting GOOPS is a tortuous process. We begin by loading a small | |
139 | ;;; set of primitives from C. | |
140 | ;;; | |
ac5185c2 | 141 | (eval-when (expand load eval) |
6ab19396 | 142 | (load-extension (string-append "libguile-" (effective-version)) |
ac5185c2 | 143 | "scm_init_goops_builtins") |
4d6a7ac6 | 144 | (add-interesting-primitive! 'class-of)) |
aec4a84a | 145 | |
9647d3d3 AW |
146 | |
147 | \f | |
148 | ||
149 | ;;; | |
150 | ;;; We then define the slots that must appear in all classes (<class> | |
26a6aaef AW |
151 | ;;; objects) and slot definitions (<slot> objects). These slots must |
152 | ;;; appear in order. We'll use this list to statically compute offsets | |
153 | ;;; for the various fields, to compute the struct layout for <class> | |
154 | ;;; instances, and to compute the slot definition lists for <class>. | |
155 | ;;; Because the list is needed at expansion-time, we define it as a | |
156 | ;;; macro. | |
9647d3d3 | 157 | ;;; |
ebca094b AW |
158 | (define-syntax macro-fold-left |
159 | (syntax-rules () | |
160 | ((_ folder seed ()) seed) | |
161 | ((_ folder seed (head . tail)) | |
162 | (macro-fold-left folder (folder head seed) tail)))) | |
163 | ||
affe170e AW |
164 | (define-syntax macro-fold-right |
165 | (syntax-rules () | |
166 | ((_ folder seed ()) seed) | |
167 | ((_ folder seed (head . tail)) | |
168 | (folder head (macro-fold-right folder seed tail))))) | |
169 | ||
26a6aaef AW |
170 | (define-syntax-rule (define-macro-folder macro-folder value ...) |
171 | (define-syntax macro-folder | |
172 | (lambda (x) | |
173 | (syntax-case x () | |
174 | ((_ fold visit seed) | |
175 | ;; The datum->syntax makes it as if each `value' were present | |
176 | ;; in the initial form, which allows them to be used as | |
177 | ;; (components of) introduced identifiers. | |
178 | #`(fold visit seed #,(datum->syntax #'visit '(value ...)))))))) | |
179 | ||
180 | (define-macro-folder fold-class-slots | |
568174d1 AW |
181 | (layout #:class <protected-read-only-slot>) |
182 | (flags #:class <hidden-slot>) | |
183 | (self #:class <self-slot>) | |
184 | (instance-finalizer #:class <hidden-slot>) | |
26a6aaef | 185 | (print) |
568174d1 AW |
186 | (name #:class <protected-hidden-slot>) |
187 | (nfields #:class <hidden-slot>) | |
188 | (%reserved #:class <hidden-slot>) | |
26a6aaef AW |
189 | (redefined) |
190 | (direct-supers) | |
191 | (direct-slots) | |
192 | (direct-subclasses) | |
193 | (direct-methods) | |
194 | (cpl) | |
568174d1 | 195 | (slots)) |
26a6aaef AW |
196 | |
197 | (define-macro-folder fold-slot-slots | |
198 | (name #:init-keyword #:name) | |
199 | (allocation #:init-keyword #:allocation #:init-value #:instance) | |
568174d1 | 200 | (init-keyword #:init-keyword #:init-keyword #:init-value #f) |
26a6aaef | 201 | (init-form #:init-keyword #:init-form) |
568174d1 | 202 | (init-value #:init-keyword #:init-value) |
26a6aaef AW |
203 | (init-thunk #:init-keyword #:init-thunk #:init-value #f) |
204 | (options) | |
568174d1 AW |
205 | (getter #:init-keyword #:getter #:init-value #f) |
206 | (setter #:init-keyword #:setter #:init-value #f) | |
207 | (accessor #:init-keyword #:accessor #:init-value #f) | |
208 | ;; These last don't have #:init-keyword because they are meant to be | |
209 | ;; set by `allocate-slots', not in compute-effective-slot-definition. | |
210 | (slot-ref #:init-value #f) | |
211 | (slot-set! #:init-value #f) | |
212 | (index #:init-value #f) | |
213 | (size #:init-value #f)) | |
ebca094b | 214 | |
9647d3d3 AW |
215 | ;;; |
216 | ;;; Statically define variables for slot offsets: `class-index-layout' | |
26a6aaef AW |
217 | ;;; will be 0, `class-index-flags' will be 1, and so on, and the same |
218 | ;;; for `slot-index-name' and such for <slot>. | |
9647d3d3 | 219 | ;;; |
26a6aaef AW |
220 | (let-syntax ((define-slot-indexer |
221 | (syntax-rules () | |
222 | ((_ define-index prefix) | |
223 | (define-syntax define-index | |
224 | (lambda (x) | |
225 | (define (id-append ctx a b) | |
226 | (datum->syntax ctx (symbol-append (syntax->datum a) | |
227 | (syntax->datum b)))) | |
228 | (define (tail-length tail) | |
229 | (syntax-case tail () | |
230 | ((begin) 0) | |
231 | ((visit head tail) (1+ (tail-length #'tail))))) | |
232 | (syntax-case x () | |
233 | ((_ (name . _) tail) | |
234 | #`(begin | |
235 | (define-syntax #,(id-append #'name #'prefix #'name) | |
236 | (identifier-syntax #,(tail-length #'tail))) | |
237 | tail))))))))) | |
238 | (define-slot-indexer define-class-index class-index-) | |
239 | (define-slot-indexer define-slot-index slot-index-) | |
240 | (fold-class-slots macro-fold-left define-class-index (begin)) | |
241 | (fold-slot-slots macro-fold-left define-slot-index (begin))) | |
9647d3d3 | 242 | |
761338f6 AW |
243 | ;;; |
244 | ;;; Structs that are vtables have a "flags" slot, which corresponds to | |
245 | ;;; class-index-flags. `vtable-flag-vtable' indicates that instances of | |
246 | ;;; a vtable are themselves vtables, and `vtable-flag-validated' | |
247 | ;;; indicates that the struct's layout has been validated. goops.c | |
c6fb41fc AW |
248 | ;;; defines a few additional flags: one to indicate that a vtable is |
249 | ;;; actually a class, one to indicate that the class is "valid" (meaning | |
250 | ;;; that it hasn't been redefined), and one to indicate that instances | |
251 | ;;; of a class are slot definition objects (<slot> instances). | |
761338f6 AW |
252 | ;;; |
253 | (define vtable-flag-goops-metaclass | |
254 | (logior vtable-flag-vtable vtable-flag-goops-class)) | |
255 | ||
256 | (define-inlinable (class-add-flags! class flags) | |
257 | (struct-set! class class-index-flags | |
258 | (logior flags (struct-ref class class-index-flags)))) | |
259 | ||
260 | (define-inlinable (class-clear-flags! class flags) | |
261 | (struct-set! class class-index-flags | |
262 | (logand (lognot flags) (struct-ref class class-index-flags)))) | |
263 | ||
264 | (define-inlinable (class-has-flags? class flags) | |
265 | (eqv? flags | |
266 | (logand (struct-ref class class-index-flags) flags))) | |
267 | ||
268 | (define-inlinable (class? obj) | |
269 | (class-has-flags? (struct-vtable obj) vtable-flag-goops-metaclass)) | |
270 | ||
c6fb41fc AW |
271 | (define-inlinable (slot? obj) |
272 | (and (struct? obj) | |
273 | (class-has-flags? (struct-vtable obj) vtable-flag-goops-slot))) | |
274 | ||
761338f6 AW |
275 | (define-inlinable (instance? obj) |
276 | (class-has-flags? (struct-vtable obj) vtable-flag-goops-class)) | |
277 | ||
9647d3d3 AW |
278 | ;;; |
279 | ;;; Now that we know the slots that must be present in classes, and | |
280 | ;;; their offsets, we can create the root of the class hierarchy. | |
281 | ;;; | |
568174d1 AW |
282 | ;;; Note that the `direct-supers', `direct-slots', `cpl', and `slots' |
283 | ;;; fields will be updated later, once we can create slot definition | |
284 | ;;; objects and once we have definitions for <top> and <object>. | |
9647d3d3 AW |
285 | ;;; |
286 | (define <class> | |
287 | (let-syntax ((cons-layout | |
288 | ;; A simple way to compute class layout for the concrete | |
289 | ;; types used in <class>. | |
290 | (syntax-rules (<protected-read-only-slot> | |
291 | <self-slot> | |
292 | <hidden-slot> | |
293 | <protected-hidden-slot>) | |
294 | ((_ (name) tail) | |
295 | (string-append "pw" tail)) | |
568174d1 | 296 | ((_ (name #:class <protected-read-only-slot>) tail) |
9647d3d3 | 297 | (string-append "pr" tail)) |
568174d1 | 298 | ((_ (name #:class <self-slot>) tail) |
9647d3d3 | 299 | (string-append "sr" tail)) |
568174d1 | 300 | ((_ (name #:class <hidden-slot>) tail) |
9647d3d3 | 301 | (string-append "uh" tail)) |
568174d1 AW |
302 | ((_ (name #:class <protected-hidden-slot>) tail) |
303 | (string-append "ph" tail))))) | |
9647d3d3 | 304 | (let* ((layout (fold-class-slots macro-fold-right cons-layout "")) |
568174d1 | 305 | (nfields (/ (string-length layout) 2)) |
761338f6 AW |
306 | (<class> (%make-vtable-vtable layout))) |
307 | (class-add-flags! <class> (logior vtable-flag-goops-class | |
308 | vtable-flag-goops-valid)) | |
9647d3d3 | 309 | (struct-set! <class> class-index-name '<class>) |
568174d1 | 310 | (struct-set! <class> class-index-nfields nfields) |
9647d3d3 | 311 | (struct-set! <class> class-index-direct-supers '()) |
568174d1 | 312 | (struct-set! <class> class-index-direct-slots '()) |
9647d3d3 AW |
313 | (struct-set! <class> class-index-direct-subclasses '()) |
314 | (struct-set! <class> class-index-direct-methods '()) | |
315 | (struct-set! <class> class-index-cpl '()) | |
568174d1 | 316 | (struct-set! <class> class-index-slots '()) |
9647d3d3 AW |
317 | (struct-set! <class> class-index-redefined #f) |
318 | <class>))) | |
51fd1cd6 | 319 | |
9647d3d3 AW |
320 | ;;; |
321 | ;;; Accessors to fields of <class>. | |
322 | ;;; | |
70dd6000 AW |
323 | (define-syntax-rule (define-class-accessor name docstring field) |
324 | (define (name obj) | |
325 | docstring | |
326 | (let ((val obj)) | |
327 | (unless (class? val) | |
328 | (scm-error 'wrong-type-arg #f "Not a class: ~S" | |
329 | (list val) #f)) | |
330 | (struct-ref val field)))) | |
331 | ||
332 | (define-class-accessor class-name | |
333 | "Return the class name of @var{obj}." | |
334 | class-index-name) | |
335 | (define-class-accessor class-direct-supers | |
336 | "Return the direct superclasses of the class @var{obj}." | |
337 | class-index-direct-supers) | |
338 | (define-class-accessor class-direct-slots | |
339 | "Return the direct slots of the class @var{obj}." | |
340 | class-index-direct-slots) | |
341 | (define-class-accessor class-direct-subclasses | |
342 | "Return the direct subclasses of the class @var{obj}." | |
343 | class-index-direct-subclasses) | |
344 | (define-class-accessor class-direct-methods | |
345 | "Return the direct methods of the class @var{obj}." | |
346 | class-index-direct-methods) | |
347 | (define-class-accessor class-precedence-list | |
348 | "Return the class precedence list of the class @var{obj}." | |
349 | class-index-cpl) | |
350 | (define-class-accessor class-slots | |
351 | "Return the slot list of the class @var{obj}." | |
352 | class-index-slots) | |
353 | ||
0ca49290 | 354 | (define (class-subclasses c) |
9647d3d3 | 355 | "Compute a list of all subclasses of @var{c}, direct and indirect." |
0ca49290 AW |
356 | (define (all-subclasses c) |
357 | (cons c (append-map all-subclasses | |
358 | (class-direct-subclasses c)))) | |
359 | (delete-duplicates (cdr (all-subclasses c)) eq?)) | |
360 | ||
361 | (define (class-methods c) | |
9647d3d3 AW |
362 | "Compute a list of all methods that specialize on @var{c} or |
363 | subclasses of @var{c}." | |
0ca49290 AW |
364 | (delete-duplicates (append-map class-direct-methods |
365 | (cons c (class-subclasses c))) | |
366 | eq?)) | |
367 | ||
568174d1 AW |
368 | (define (is-a? obj class) |
369 | "Return @code{#t} if @var{obj} is an instance of @var{class}, or | |
370 | @code{#f} otherwise." | |
371 | (and (memq class (class-precedence-list (class-of obj))) #t)) | |
372 | ||
9647d3d3 AW |
373 | |
374 | \f | |
375 | ||
376 | ;;; | |
568174d1 AW |
377 | ;;; At this point, <class> is missing slot definitions, but we can't |
378 | ;;; create slot definitions until we have a slot definition class. | |
379 | ;;; Continue with manual object creation until we're able to bootstrap | |
380 | ;;; more of the protocol. Again, the CPL and class hierarchy slots | |
381 | ;;; remain uninitialized. | |
9647d3d3 | 382 | ;;; |
568174d1 AW |
383 | (define* (get-keyword key l #:optional default) |
384 | "Determine an associated value for the keyword @var{key} from the list | |
385 | @var{l}. The list @var{l} has to consist of an even number of elements, | |
386 | where, starting with the first, every second element is a keyword, | |
387 | followed by its associated value. If @var{l} does not hold a value for | |
388 | @var{key}, the value @var{default} is returned." | |
389 | (unless (keyword? key) | |
390 | (scm-error 'wrong-type-arg #f "Not a keyword: ~S" (list key) #f)) | |
391 | (let lp ((l l)) | |
392 | (match l | |
393 | (() default) | |
394 | ((kw arg . l) | |
395 | (unless (keyword? kw) | |
396 | (scm-error 'wrong-type-arg #f "Not a keyword: ~S" (list kw) #f)) | |
397 | (if (eq? kw key) arg (lp l)))))) | |
398 | ||
399 | (define *unbound* (list 'unbound)) | |
400 | ||
401 | (define-inlinable (unbound? x) | |
402 | (eq? x *unbound*)) | |
403 | ||
404 | (define (%allocate-instance class) | |
405 | (let ((obj (allocate-struct class (struct-ref class class-index-nfields)))) | |
406 | (%clear-fields! obj *unbound*) | |
407 | obj)) | |
408 | ||
409 | (define <slot> | |
410 | (let-syntax ((cons-layout | |
411 | ;; All slots are "pw" in <slot>. | |
412 | (syntax-rules () | |
413 | ((_ _ tail) (string-append "pw" tail))))) | |
414 | (let* ((layout (fold-slot-slots macro-fold-right cons-layout "")) | |
415 | (nfields (/ (string-length layout) 2)) | |
416 | (<slot> (make-struct/no-tail <class> (make-struct-layout layout)))) | |
417 | (class-add-flags! <slot> (logior vtable-flag-goops-class | |
e437c50b | 418 | vtable-flag-goops-slot |
568174d1 AW |
419 | vtable-flag-goops-valid)) |
420 | (struct-set! <slot> class-index-name '<slot>) | |
421 | (struct-set! <slot> class-index-nfields nfields) | |
422 | (struct-set! <slot> class-index-direct-supers '()) | |
423 | (struct-set! <slot> class-index-direct-slots '()) | |
424 | (struct-set! <slot> class-index-direct-subclasses '()) | |
425 | (struct-set! <slot> class-index-direct-methods '()) | |
426 | (struct-set! <slot> class-index-cpl (list <slot>)) | |
427 | (struct-set! <slot> class-index-slots '()) | |
428 | (struct-set! <slot> class-index-redefined #f) | |
429 | <slot>))) | |
430 | ||
3f4829e0 AW |
431 | ;;; Access to slot objects is performance-sensitive for slot-ref, so in |
432 | ;;; addition to the type-checking accessors that we export, we also | |
433 | ;;; define some internal inlined helpers that just do an unchecked | |
434 | ;;; struct-ref in cases where we know the object must be a slot, as | |
435 | ;;; when accessing class-slots. | |
436 | ;;; | |
2a3ef7c4 AW |
437 | (define-syntax-rule (define-slot-accessor name docstring %name field) |
438 | (begin | |
439 | (define-syntax-rule (%name obj) | |
440 | (struct-ref obj field)) | |
441 | (define (name obj) | |
442 | docstring | |
443 | (unless (slot? obj) | |
568174d1 | 444 | (scm-error 'wrong-type-arg #f "Not a slot: ~S" |
2a3ef7c4 AW |
445 | (list obj) #f)) |
446 | (%name obj)))) | |
568174d1 AW |
447 | |
448 | (define-slot-accessor slot-definition-name | |
449 | "Return the name of @var{obj}." | |
2a3ef7c4 | 450 | %slot-definition-name slot-index-name) |
568174d1 AW |
451 | (define-slot-accessor slot-definition-allocation |
452 | "Return the allocation of the slot @var{obj}." | |
2a3ef7c4 | 453 | %slot-definition-allocation slot-index-allocation) |
568174d1 AW |
454 | (define-slot-accessor slot-definition-init-keyword |
455 | "Return the init keyword of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 456 | %slot-definition-init-keyword slot-index-init-keyword) |
568174d1 AW |
457 | (define-slot-accessor slot-definition-init-form |
458 | "Return the init form of the slot @var{obj}, or the unbound value" | |
2a3ef7c4 | 459 | %slot-definition-init-form slot-index-init-form) |
568174d1 AW |
460 | (define-slot-accessor slot-definition-init-value |
461 | "Return the init value of the slot @var{obj}, or the unbound value." | |
2a3ef7c4 | 462 | %slot-definition-init-value slot-index-init-value) |
568174d1 AW |
463 | (define-slot-accessor slot-definition-init-thunk |
464 | "Return the init thunk of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 465 | %slot-definition-init-thunk slot-index-init-thunk) |
568174d1 AW |
466 | (define-slot-accessor slot-definition-options |
467 | "Return the initargs given when creating the slot @var{obj}." | |
2a3ef7c4 | 468 | %slot-definition-options slot-index-options) |
568174d1 AW |
469 | (define-slot-accessor slot-definition-getter |
470 | "Return the getter of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 471 | %slot-definition-getter slot-index-getter) |
568174d1 AW |
472 | (define-slot-accessor slot-definition-setter |
473 | "Return the setter of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 474 | %slot-definition-setter slot-index-setter) |
568174d1 AW |
475 | (define-slot-accessor slot-definition-accessor |
476 | "Return the accessor of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 477 | %slot-definition-accessor slot-index-accessor) |
568174d1 AW |
478 | (define-slot-accessor slot-definition-slot-ref |
479 | "Return the slot-ref procedure of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 480 | %slot-definition-slot-ref slot-index-slot-ref) |
568174d1 AW |
481 | (define-slot-accessor slot-definition-slot-set! |
482 | "Return the slot-set! procedure of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 483 | %slot-definition-slot-set! slot-index-slot-set!) |
568174d1 AW |
484 | (define-slot-accessor slot-definition-index |
485 | "Return the allocated struct offset of the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 486 | %slot-definition-index slot-index-index) |
568174d1 AW |
487 | (define-slot-accessor slot-definition-size |
488 | "Return the number fields used by the slot @var{obj}, or @code{#f}." | |
2a3ef7c4 | 489 | %slot-definition-size slot-index-size) |
568174d1 | 490 | |
568174d1 AW |
491 | ;; Boot definition. |
492 | (define (direct-slot-definition-class class initargs) | |
493 | (get-keyword #:class initargs <slot>)) | |
494 | ||
495 | ;; Boot definition. | |
496 | (define (make-slot class initargs) | |
497 | (let ((slot (make-struct/no-tail class))) | |
498 | (define-syntax-rule (init-slot offset kw default) | |
499 | (struct-set! slot offset (get-keyword kw initargs default))) | |
500 | (init-slot slot-index-name #:name #f) | |
501 | (init-slot slot-index-allocation #:allocation #:instance) | |
502 | (init-slot slot-index-init-keyword #:init-keyword #f) | |
503 | (init-slot slot-index-init-form #:init-form *unbound*) | |
504 | (init-slot slot-index-init-value #:init-value *unbound*) | |
505 | (struct-set! slot slot-index-init-thunk | |
506 | (or (get-keyword #:init-thunk initargs #f) | |
2a3ef7c4 | 507 | (let ((val (%slot-definition-init-value slot))) |
568174d1 AW |
508 | (if (unbound? val) |
509 | #f | |
510 | (lambda () val))))) | |
511 | (struct-set! slot slot-index-options initargs) | |
512 | (init-slot slot-index-getter #:getter #f) | |
513 | (init-slot slot-index-setter #:setter #f) | |
514 | (init-slot slot-index-accessor #:accessor #f) | |
515 | (init-slot slot-index-slot-ref #:slot-ref #f) | |
516 | (init-slot slot-index-slot-set! #:slot-set! #f) | |
517 | (init-slot slot-index-index #:index #f) | |
518 | (init-slot slot-index-size #:size #f) | |
519 | slot)) | |
520 | ||
521 | ;; Boot definition. | |
522 | (define (make class . args) | |
523 | (unless (memq <slot> (class-precedence-list class)) | |
524 | (error "Unsupported class: ~S" class)) | |
525 | (make-slot class args)) | |
526 | ||
527 | ;; Boot definition. | |
528 | (define (compute-direct-slot-definition class initargs) | |
529 | (apply make (direct-slot-definition-class class initargs) initargs)) | |
530 | ||
531 | (define (compute-direct-slot-definition-initargs class slot-spec) | |
532 | (match slot-spec | |
533 | ((? symbol? name) (list #:name name)) | |
534 | (((? symbol? name) . initargs) | |
535 | (cons* #:name name | |
536 | ;; If there is an #:init-form, the `class' macro will have | |
537 | ;; already added an #:init-thunk. Still, if there isn't an | |
538 | ;; #:init-thunk already but we do have an #:init-value, | |
539 | ;; synthesize an #:init-thunk initarg. This will ensure | |
540 | ;; that the #:init-thunk gets passed on to the effective | |
541 | ;; slot definition too. | |
542 | (if (get-keyword #:init-thunk initargs) | |
543 | initargs | |
544 | (let ((value (get-keyword #:init-value initargs *unbound*))) | |
545 | (if (unbound? value) | |
546 | initargs | |
547 | (cons* #:init-thunk (lambda () value) initargs)))))))) | |
548 | ||
549 | (let () | |
550 | (define-syntax cons-slot | |
551 | (syntax-rules () | |
552 | ((_ (name #:class class) tail) | |
553 | ;; Special case to avoid referencing specialized <slot> kinds, | |
554 | ;; which are not defined yet. | |
555 | (cons (list 'name) tail)) | |
556 | ((_ (name . initargs) tail) | |
557 | (cons (list 'name . initargs) tail)))) | |
558 | (define-syntax-rule (initialize-direct-slots! class fold-slots) | |
559 | (let ((specs (fold-slots macro-fold-right cons-slot '()))) | |
560 | (define (make-direct-slot-definition spec) | |
561 | (let ((initargs (compute-direct-slot-definition-initargs class spec))) | |
562 | (compute-direct-slot-definition class initargs))) | |
563 | (struct-set! class class-index-direct-slots | |
564 | (map make-direct-slot-definition specs)))) | |
565 | ||
566 | (initialize-direct-slots! <class> fold-class-slots) | |
567 | (initialize-direct-slots! <slot> fold-slot-slots)) | |
9647d3d3 AW |
568 | |
569 | ||
570 | \f | |
571 | ||
572 | ;;; | |
568174d1 AW |
573 | ;;; OK, at this point we have initialized `direct-slots' on both <class> |
574 | ;;; and <slot>. We need to define a standard way to make subclasses: | |
575 | ;;; how to compute the precedence list of subclasses, how to compute the | |
576 | ;;; list of slots in a subclass, and what layout to use for instances of | |
577 | ;;; those classes. | |
9647d3d3 | 578 | ;;; |
70dd6000 | 579 | (define (compute-std-cpl c get-direct-supers) |
9c49d475 | 580 | "The standard class precedence list computation algorithm." |
70dd6000 AW |
581 | (define (only-non-null lst) |
582 | (filter (lambda (l) (not (null? l))) lst)) | |
583 | ||
584 | (define (merge-lists reversed-partial-result inputs) | |
585 | (cond | |
586 | ((every null? inputs) | |
587 | (reverse! reversed-partial-result)) | |
588 | (else | |
589 | (let* ((candidate (lambda (c) | |
590 | (and (not (any (lambda (l) | |
591 | (memq c (cdr l))) | |
592 | inputs)) | |
593 | c))) | |
594 | (candidate-car (lambda (l) | |
595 | (and (not (null? l)) | |
596 | (candidate (car l))))) | |
597 | (next (any candidate-car inputs))) | |
bacc8829 AW |
598 | (unless next |
599 | (goops-error "merge-lists: Inconsistent precedence graph")) | |
70dd6000 AW |
600 | (let ((remove-next (lambda (l) |
601 | (if (eq? (car l) next) | |
602 | (cdr l) | |
603 | l)))) | |
604 | (merge-lists (cons next reversed-partial-result) | |
605 | (only-non-null (map remove-next inputs)))))))) | |
606 | (let ((c-direct-supers (get-direct-supers c))) | |
607 | (merge-lists (list c) | |
608 | (only-non-null (append (map class-precedence-list | |
609 | c-direct-supers) | |
610 | (list c-direct-supers)))))) | |
611 | ||
9c49d475 AW |
612 | ;; This version of compute-cpl is replaced with a generic function once |
613 | ;; GOOPS has booted. | |
70dd6000 AW |
614 | (define (compute-cpl class) |
615 | (compute-std-cpl class class-direct-supers)) | |
616 | ||
568174d1 AW |
617 | (define (effective-slot-definition-class class slot) |
618 | (class-of slot)) | |
619 | ||
620 | (define (compute-effective-slot-definition class slot) | |
621 | ;; FIXME: Support slot being a list of slots, as in CLOS. | |
622 | (apply make | |
623 | (effective-slot-definition-class class slot) | |
624 | (slot-definition-options slot))) | |
625 | ||
e0590e7c | 626 | (define (build-slots-list dslots cpl) |
568174d1 | 627 | (define (slot-memq slot slots) |
2a3ef7c4 | 628 | (let ((name (%slot-definition-name slot))) |
568174d1 AW |
629 | (let lp ((slots slots)) |
630 | (match slots | |
631 | (() #f) | |
632 | ((slot . slots) | |
2a3ef7c4 | 633 | (or (eq? (%slot-definition-name slot) name) (lp slots))))))) |
e437c50b AW |
634 | (define (check-cpl slots static-slots) |
635 | (when (or-map (lambda (slot) (slot-memq slot slots)) static-slots) | |
e0590e7c | 636 | (scm-error 'misc-error #f |
e437c50b | 637 | "a predefined static inherited field cannot be redefined" |
e0590e7c AW |
638 | '() '()))) |
639 | (define (remove-duplicate-slots slots) | |
640 | (let lp ((slots (reverse slots)) (res '()) (seen '())) | |
f5c34767 AW |
641 | (match slots |
642 | (() res) | |
568174d1 | 643 | ((slot . slots) |
2a3ef7c4 | 644 | (let ((name (%slot-definition-name slot))) |
568174d1 AW |
645 | (if (memq name seen) |
646 | (lp slots res seen) | |
647 | (lp slots (cons slot res) (cons name seen)))))))) | |
e437c50b AW |
648 | ;; For subclases of <class> and <slot>, we need to ensure that the |
649 | ;; <class> or <slot> slots come first. | |
650 | (let* ((static-slots (cond | |
651 | ((memq <class> cpl) | |
652 | (when (memq <slot> cpl) (error "invalid class")) | |
653 | (struct-ref <class> class-index-slots)) | |
654 | ((memq <slot> cpl) | |
655 | (struct-ref <slot> class-index-slots)) | |
656 | (else #f)))) | |
657 | (when static-slots | |
658 | (check-cpl dslots static-slots)) | |
659 | (let lp ((cpl (cdr cpl)) (res dslots) (static-slots '())) | |
f5c34767 | 660 | (match cpl |
e437c50b | 661 | (() (remove-duplicate-slots (append static-slots res))) |
f5c34767 AW |
662 | ((head . cpl) |
663 | (let ((new-slots (struct-ref head class-index-direct-slots))) | |
664 | (cond | |
e437c50b AW |
665 | ((not static-slots) |
666 | (lp cpl (append new-slots res) static-slots)) | |
667 | ((or (eq? head <class>) (eq? head <slot>)) | |
668 | ;; Move static slots to the head of the list. | |
f5c34767 AW |
669 | (lp cpl res new-slots)) |
670 | (else | |
e437c50b AW |
671 | (check-cpl new-slots static-slots) |
672 | (lp cpl (append new-slots res) static-slots))))))))) | |
51fd1cd6 | 673 | |
568174d1 AW |
674 | ;; Boot definition. |
675 | (define (compute-get-n-set class slot) | |
676 | (let ((index (struct-ref class class-index-nfields))) | |
677 | (struct-set! class class-index-nfields (1+ index)) | |
678 | index)) | |
679 | ||
680 | (define (allocate-slots class slots) | |
681 | "Transform the computed list of direct slot definitions @var{slots} | |
682 | into a corresponding list of effective slot definitions, allocating | |
683 | slots as we go." | |
684 | (define (make-effective-slot-definition slot) | |
685 | ;; `compute-get-n-set' is expected to mutate `nfields' if it | |
686 | ;; allocates a field to the object. Pretty strange, but we preserve | |
687 | ;; the behavior for backward compatibility. | |
688 | (let* ((slot (compute-effective-slot-definition class slot)) | |
689 | (index (struct-ref class class-index-nfields)) | |
690 | (g-n-s (compute-get-n-set class slot)) | |
691 | (size (- (struct-ref class class-index-nfields) index))) | |
692 | (call-with-values | |
693 | (lambda () | |
694 | (match g-n-s | |
695 | ((? integer?) | |
696 | (unless (= size 1) | |
697 | (error "unexpected return from compute-get-n-set")) | |
698 | (values #f #f)) | |
699 | (((? procedure? get) (? procedure? set)) | |
700 | (values get set)))) | |
701 | (lambda (get set) | |
702 | (struct-set! slot slot-index-index index) | |
703 | (struct-set! slot slot-index-size size) | |
704 | (struct-set! slot slot-index-slot-ref get) | |
705 | (struct-set! slot slot-index-slot-set! set))) | |
706 | slot)) | |
707 | (struct-set! class class-index-nfields 0) | |
708 | (map-in-order make-effective-slot-definition slots)) | |
709 | ||
710 | (define (%compute-layout slots nfields is-class?) | |
711 | (define (slot-protection-and-kind slot) | |
e0590e7c AW |
712 | (define (subclass? class parent) |
713 | (memq parent (class-precedence-list class))) | |
2a3ef7c4 | 714 | (let ((type (kw-arg-ref (%slot-definition-options slot) #:class))) |
e0590e7c AW |
715 | (if (and type (subclass? type <foreign-slot>)) |
716 | (values (cond | |
717 | ((subclass? type <self-slot>) #\s) | |
718 | ((subclass? type <protected-slot>) #\p) | |
719 | (else #\u)) | |
720 | (cond | |
721 | ((subclass? type <opaque-slot>) #\o) | |
722 | ((subclass? type <read-only-slot>) #\r) | |
723 | ((subclass? type <hidden-slot>) #\h) | |
724 | (else #\w))) | |
725 | (values #\p #\w)))) | |
e0590e7c | 726 | (let ((layout (make-string (* nfields 2)))) |
568174d1 AW |
727 | (let lp ((n 0) (slots slots)) |
728 | (match slots | |
e0590e7c AW |
729 | (() |
730 | (unless (= n nfields) (error "bad nfields")) | |
e0590e7c | 731 | (when is-class? |
8dfc0ba5 AW |
732 | (let ((class-layout (struct-ref <class> class-index-layout))) |
733 | (unless (string-prefix? (symbol->string class-layout) layout) | |
e0590e7c AW |
734 | (error "bad layout for class")))) |
735 | layout) | |
568174d1 | 736 | ((slot . slots) |
2a3ef7c4 | 737 | (unless (= n (%slot-definition-index slot)) (error "bad allocation")) |
568174d1 AW |
738 | (call-with-values (lambda () (slot-protection-and-kind slot)) |
739 | (lambda (protection kind) | |
2a3ef7c4 | 740 | (let init ((n n) (size (%slot-definition-size slot))) |
568174d1 AW |
741 | (cond |
742 | ((zero? size) (lp n slots)) | |
743 | (else | |
744 | (unless (< n nfields) (error "bad nfields")) | |
745 | (string-set! layout (* n 2) protection) | |
746 | (string-set! layout (1+ (* n 2)) kind) | |
747 | (init (1+ n) (1- size)))))))))))) | |
e0590e7c | 748 | |
9647d3d3 AW |
749 | |
750 | \f | |
751 | ||
752 | ;;; | |
753 | ;;; With all of this, we are now able to define subclasses of <class>. | |
754 | ;;; | |
e0590e7c | 755 | (define (%prep-layout! class) |
8dfc0ba5 | 756 | (let* ((is-class? (and (memq <class> (struct-ref class class-index-cpl)) #t)) |
568174d1 AW |
757 | (layout (%compute-layout (struct-ref class class-index-slots) |
758 | (struct-ref class class-index-nfields) | |
759 | is-class?))) | |
e0590e7c AW |
760 | (%init-layout! class layout))) |
761 | ||
762 | (define (make-standard-class class name dsupers dslots) | |
763 | (let ((z (make-struct/no-tail class))) | |
568174d1 AW |
764 | (define (make-direct-slot-definition dslot) |
765 | (let ((initargs (compute-direct-slot-definition-initargs z dslot))) | |
766 | (compute-direct-slot-definition z initargs))) | |
767 | ||
768 | (struct-set! z class-index-name name) | |
769 | (struct-set! z class-index-nfields 0) | |
8dfc0ba5 | 770 | (struct-set! z class-index-direct-supers dsupers) |
568174d1 AW |
771 | (struct-set! z class-index-direct-subclasses '()) |
772 | (struct-set! z class-index-direct-methods '()) | |
773 | (struct-set! z class-index-redefined #f) | |
774 | (let ((cpl (compute-cpl z))) | |
8dfc0ba5 | 775 | (struct-set! z class-index-cpl cpl) |
e437c50b AW |
776 | (when (memq <slot> cpl) |
777 | (class-add-flags! z vtable-flag-goops-slot)) | |
568174d1 AW |
778 | (let* ((dslots (map make-direct-slot-definition dslots)) |
779 | (slots (allocate-slots z (build-slots-list dslots cpl)))) | |
780 | (struct-set! z class-index-direct-slots dslots) | |
781 | (struct-set! z class-index-slots slots))) | |
782 | (for-each | |
783 | (lambda (super) | |
784 | (let ((subclasses (struct-ref super class-index-direct-subclasses))) | |
785 | (struct-set! super class-index-direct-subclasses | |
786 | (cons z subclasses)))) | |
787 | dsupers) | |
788 | (%prep-layout! z) | |
789 | z)) | |
e0590e7c | 790 | |
e0590e7c AW |
791 | (define-syntax define-standard-class |
792 | (syntax-rules () | |
793 | ((define-standard-class name (super ...) #:metaclass meta slot ...) | |
794 | (define name | |
795 | (make-standard-class meta 'name (list super ...) '(slot ...)))) | |
796 | ((define-standard-class name (super ...) slot ...) | |
797 | (define-standard-class name (super ...) #:metaclass <class> slot ...)))) | |
798 | ||
9647d3d3 AW |
799 | |
800 | \f | |
801 | ||
802 | ;;; | |
803 | ;;; Sweet! Now we can define <top> and <object>, and finish | |
804 | ;;; initializing the `direct-subclasses', `direct-supers', and `cpl' | |
805 | ;;; slots of <class>. | |
806 | ;;; | |
e0590e7c AW |
807 | (define-standard-class <top> ()) |
808 | (define-standard-class <object> (<top>)) | |
809 | ||
568174d1 AW |
810 | ;; The inheritance links for <top>, <object>, <class>, and <slot> were |
811 | ;; partially initialized. Correct them here. | |
812 | (struct-set! <object> class-index-direct-subclasses (list <slot> <class>)) | |
8dfc0ba5 | 813 | (struct-set! <class> class-index-direct-supers (list <object>)) |
568174d1 | 814 | (struct-set! <slot> class-index-direct-supers (list <object>)) |
8dfc0ba5 | 815 | (struct-set! <class> class-index-cpl (list <class> <object> <top>)) |
568174d1 | 816 | (struct-set! <slot> class-index-cpl (list <slot> <object> <top>)) |
e0590e7c | 817 | |
9647d3d3 AW |
818 | |
819 | \f | |
820 | ||
821 | ;;; | |
822 | ;;; We can also define the various slot types, and finish initializing | |
568174d1 | 823 | ;;; `direct-slots' and `slots' on <class> and <slot>. |
9647d3d3 | 824 | ;;; |
568174d1 | 825 | (define-standard-class <foreign-slot> (<slot>)) |
e0590e7c AW |
826 | (define-standard-class <protected-slot> (<foreign-slot>)) |
827 | (define-standard-class <hidden-slot> (<foreign-slot>)) | |
828 | (define-standard-class <opaque-slot> (<foreign-slot>)) | |
829 | (define-standard-class <read-only-slot> (<foreign-slot>)) | |
830 | (define-standard-class <self-slot> (<read-only-slot>)) | |
831 | (define-standard-class <protected-opaque-slot> (<protected-slot> | |
832 | <opaque-slot>)) | |
833 | (define-standard-class <protected-hidden-slot> (<protected-slot> | |
834 | <hidden-slot>)) | |
835 | (define-standard-class <protected-read-only-slot> (<protected-slot> | |
836 | <read-only-slot>)) | |
837 | (define-standard-class <scm-slot> (<protected-slot>)) | |
838 | (define-standard-class <int-slot> (<foreign-slot>)) | |
839 | (define-standard-class <float-slot> (<foreign-slot>)) | |
840 | (define-standard-class <double-slot> (<foreign-slot>)) | |
841 | ||
568174d1 AW |
842 | |
843 | \f | |
844 | ||
845 | ;;; | |
846 | ;;; Finally! Initialize `direct-slots' and `slots' on <class>, and | |
847 | ;;; `slots' on <slot>. | |
848 | ;;; | |
849 | (let () | |
850 | (define-syntax-rule (cons-slot (name . initargs) tail) | |
851 | (cons (list 'name . initargs) tail)) | |
852 | (define-syntax-rule (initialize-direct-slots! class fold-slots) | |
853 | (let ((specs (fold-slots macro-fold-right cons-slot '()))) | |
854 | (define (make-direct-slot-definition spec) | |
855 | (let ((initargs (compute-direct-slot-definition-initargs class spec))) | |
856 | (compute-direct-slot-definition class initargs))) | |
857 | (struct-set! class class-index-direct-slots | |
858 | (map make-direct-slot-definition specs)))) | |
859 | (define (initialize-slots! class) | |
860 | (let ((slots (build-slots-list (class-direct-slots class) | |
861 | (class-precedence-list class)))) | |
862 | (struct-set! class class-index-slots (allocate-slots class slots)))) | |
863 | ||
864 | ;; Finish initializing <class> with the specialized slot kinds. | |
865 | (initialize-direct-slots! <class> fold-class-slots) | |
866 | ||
867 | (initialize-slots! <class>) | |
868 | (initialize-slots! <slot>)) | |
e0590e7c | 869 | |
9647d3d3 AW |
870 | |
871 | \f | |
872 | ||
873 | ;;; | |
874 | ;;; Now, to build out the class hierarchy. | |
875 | ;;; | |
876 | ||
e0590e7c | 877 | (define-standard-class <procedure-class> (<class>)) |
761338f6 | 878 | |
6c7dd9eb AW |
879 | (define-standard-class <applicable-struct-class> |
880 | (<procedure-class>)) | |
761338f6 AW |
881 | (class-add-flags! <applicable-struct-class> |
882 | vtable-flag-applicable-vtable) | |
883 | ||
6c7dd9eb AW |
884 | (define-standard-class <applicable-struct-with-setter-class> |
885 | (<applicable-struct-class>)) | |
761338f6 AW |
886 | (class-add-flags! <applicable-struct-with-setter-class> |
887 | vtable-flag-setter-vtable) | |
6c7dd9eb | 888 | |
e0590e7c AW |
889 | (define-standard-class <applicable> (<top>)) |
890 | (define-standard-class <applicable-struct> (<object> <applicable>) | |
891 | #:metaclass <applicable-struct-class> | |
892 | procedure) | |
6c7dd9eb AW |
893 | (define-standard-class <applicable-struct-with-setter> (<applicable-struct>) |
894 | #:metaclass <applicable-struct-with-setter-class> | |
895 | setter) | |
e0590e7c AW |
896 | (define-standard-class <generic> (<applicable-struct>) |
897 | #:metaclass <applicable-struct-class> | |
898 | methods | |
899 | (n-specialized #:init-value 0) | |
900 | (extended-by #:init-value ()) | |
901 | effective-methods) | |
e0590e7c AW |
902 | (define-standard-class <extended-generic> (<generic>) |
903 | #:metaclass <applicable-struct-class> | |
904 | (extends #:init-value ())) | |
6c7dd9eb AW |
905 | (define-standard-class <generic-with-setter> (<generic> |
906 | <applicable-struct-with-setter>) | |
907 | #:metaclass <applicable-struct-with-setter-class>) | |
e0590e7c | 908 | (define-standard-class <accessor> (<generic-with-setter>) |
6c7dd9eb | 909 | #:metaclass <applicable-struct-with-setter-class>) |
e0590e7c AW |
910 | (define-standard-class <extended-generic-with-setter> (<extended-generic> |
911 | <generic-with-setter>) | |
6c7dd9eb | 912 | #:metaclass <applicable-struct-with-setter-class>) |
e0590e7c AW |
913 | (define-standard-class <extended-accessor> (<accessor> |
914 | <extended-generic-with-setter>) | |
6c7dd9eb | 915 | #:metaclass <applicable-struct-with-setter-class>) |
e0590e7c | 916 | |
6c7dd9eb AW |
917 | (define-standard-class <method> (<object>) |
918 | generic-function | |
919 | specializers | |
920 | procedure | |
921 | formals | |
922 | body | |
923 | make-procedure) | |
924 | (define-standard-class <accessor-method> (<method>) | |
925 | (slot-definition #:init-keyword #:slot-definition)) | |
926 | ||
e0590e7c AW |
927 | (define-standard-class <boolean> (<top>)) |
928 | (define-standard-class <char> (<top>)) | |
929 | (define-standard-class <list> (<top>)) | |
0d96acac AW |
930 | ;; Not all pairs are lists, but there is code out there that relies on |
931 | ;; (is-a? '(1 2 3) <list>) to work. Terrible. How to fix? | |
e0590e7c AW |
932 | (define-standard-class <pair> (<list>)) |
933 | (define-standard-class <null> (<list>)) | |
934 | (define-standard-class <string> (<top>)) | |
935 | (define-standard-class <symbol> (<top>)) | |
936 | (define-standard-class <vector> (<top>)) | |
937 | (define-standard-class <foreign> (<top>)) | |
938 | (define-standard-class <hashtable> (<top>)) | |
939 | (define-standard-class <fluid> (<top>)) | |
940 | (define-standard-class <dynamic-state> (<top>)) | |
941 | (define-standard-class <frame> (<top>)) | |
942 | (define-standard-class <vm-continuation> (<top>)) | |
943 | (define-standard-class <bytevector> (<top>)) | |
944 | (define-standard-class <uvec> (<bytevector>)) | |
945 | (define-standard-class <array> (<top>)) | |
946 | (define-standard-class <bitvector> (<top>)) | |
947 | (define-standard-class <number> (<top>)) | |
948 | (define-standard-class <complex> (<number>)) | |
949 | (define-standard-class <real> (<complex>)) | |
950 | (define-standard-class <integer> (<real>)) | |
951 | (define-standard-class <fraction> (<real>)) | |
952 | (define-standard-class <keyword> (<top>)) | |
953 | (define-standard-class <unknown> (<top>)) | |
954 | (define-standard-class <procedure> (<applicable>) | |
955 | #:metaclass <procedure-class>) | |
956 | (define-standard-class <primitive-generic> (<procedure>) | |
957 | #:metaclass <procedure-class>) | |
958 | (define-standard-class <port> (<top>)) | |
959 | (define-standard-class <input-port> (<port>)) | |
960 | (define-standard-class <output-port> (<port>)) | |
961 | (define-standard-class <input-output-port> (<input-port> <output-port>)) | |
962 | ||
f37bece4 AW |
963 | (define (inherit-applicable! class) |
964 | "An internal routine to redefine a SMOB class that was added after | |
965 | GOOPS was loaded, and on which scm_set_smob_apply installed an apply | |
966 | function." | |
967 | ;; Why not use class-redefinition? We would, except that loading the | |
968 | ;; compiler to compile effective methods can happen while GOOPS has | |
969 | ;; only been partially loaded, and loading the compiler might cause | |
970 | ;; SMOB types to be defined that need this facility. Instead we make | |
971 | ;; a very specific hack, not a general solution. Probably the right | |
972 | ;; solution is to avoid using the compiler, but that is another kettle | |
973 | ;; of fish. | |
974 | (unless (memq <applicable> (class-precedence-list class)) | |
975 | (unless (null? (class-slots class)) | |
976 | (error "SMOB object has slots?")) | |
977 | (for-each | |
978 | (lambda (super) | |
979 | (let ((subclasses (struct-ref super class-index-direct-subclasses))) | |
980 | (struct-set! super class-index-direct-subclasses | |
981 | (delq class subclasses)))) | |
982 | (struct-ref class class-index-direct-supers)) | |
983 | (struct-set! class class-index-direct-supers (list <applicable>)) | |
984 | (struct-set! class class-index-cpl (compute-cpl class)) | |
985 | (let ((subclasses (struct-ref <applicable> class-index-direct-subclasses))) | |
986 | (struct-set! <applicable> class-index-direct-subclasses | |
987 | (cons class subclasses))))) | |
988 | ||
9ae00706 AW |
989 | |
990 | \f | |
991 | ||
992 | ;;; | |
993 | ;;; At this point we have defined the class hierarchy, and it's time to | |
994 | ;;; move on to instance allocation and generics. Once we have generics, | |
995 | ;;; we'll fill out the metaobject protocol. | |
996 | ;;; | |
997 | ;;; Here we define a limited version of `make', so that we can allocate | |
998 | ;;; instances of specific classes. This definition will be replaced | |
999 | ;;; later. | |
1000 | ;;; | |
e0590e7c | 1001 | (define (%invalidate-method-cache! gf) |
0d96acac AW |
1002 | (slot-set! gf 'effective-methods '()) |
1003 | (recompute-generic-function-dispatch-procedure! gf)) | |
e0590e7c AW |
1004 | |
1005 | ;; Boot definition. | |
1006 | (define (invalidate-method-cache! gf) | |
1007 | (%invalidate-method-cache! gf)) | |
1008 | ||
e0590e7c AW |
1009 | (define (make class . args) |
1010 | (cond | |
1011 | ((or (eq? class <generic>) (eq? class <accessor>)) | |
1012 | (let ((z (make-struct/no-tail class #f '() 0 '()))) | |
1013 | (set-procedure-property! z 'name (get-keyword #:name args #f)) | |
1014 | (invalidate-method-cache! z) | |
1015 | (when (eq? class <accessor>) | |
1016 | (let ((setter (get-keyword #:setter args #f))) | |
1017 | (when setter | |
6c7dd9eb | 1018 | (slot-set! z 'setter setter)))) |
e0590e7c AW |
1019 | z)) |
1020 | (else | |
07452c83 | 1021 | (let ((z (%allocate-instance class))) |
e0590e7c AW |
1022 | (cond |
1023 | ((or (eq? class <method>) (eq? class <accessor-method>)) | |
1024 | (for-each (match-lambda | |
1025 | ((kw slot default) | |
1026 | (slot-set! z slot (get-keyword kw args default)))) | |
1027 | '((#:generic-function generic-function #f) | |
1028 | (#:specializers specializers ()) | |
1029 | (#:procedure procedure #f) | |
1030 | (#:formals formals ()) | |
1031 | (#:body body ()) | |
1032 | (#:make-procedure make-procedure #f)))) | |
1033 | ((memq <class> (class-precedence-list class)) | |
761338f6 AW |
1034 | (class-add-flags! z (logior vtable-flag-goops-class |
1035 | vtable-flag-goops-valid)) | |
e0590e7c AW |
1036 | (for-each (match-lambda |
1037 | ((kw slot default) | |
1038 | (slot-set! z slot (get-keyword kw args default)))) | |
1039 | '((#:name name ???) | |
1040 | (#:dsupers direct-supers ()) | |
f5c34767 | 1041 | (#:slots direct-slots ())))) |
e0590e7c AW |
1042 | (else |
1043 | (error "boot `make' does not support this class" class))) | |
1044 | z)))) | |
1045 | ||
9ae00706 AW |
1046 | |
1047 | \f | |
1048 | ||
1049 | ;;; | |
568174d1 | 1050 | ;;; Slot access. |
b89432ff AW |
1051 | ;;; |
1052 | ;;; Before we go on, some notes about class redefinition. In GOOPS, | |
1053 | ;;; classes can be redefined. Redefinition of a class marks the class | |
1054 | ;;; as invalid, and instances will be lazily migrated over to the new | |
1055 | ;;; representation as they are accessed. Migration happens when | |
1056 | ;;; `class-of' is called on an instance. For more technical details on | |
1057 | ;;; object redefinition, see struct.h. | |
1058 | ;;; | |
1059 | ;;; In the following interfaces, class-of handles the redefinition | |
1060 | ;;; protocol. I would think though that there is some thread-unsafety | |
1061 | ;;; here though as the { class, object data } pair needs to be accessed | |
1062 | ;;; atomically, not the { class, object } pair. | |
1063 | ;;; | |
c4974c57 AW |
1064 | (define-inlinable (%class-slot-definition class slot-name kt kf) |
1065 | (let lp ((slots (struct-ref class class-index-slots))) | |
1066 | (match slots | |
1067 | ((slot . slots) | |
2a3ef7c4 | 1068 | (if (eq? (%slot-definition-name slot) slot-name) |
c4974c57 AW |
1069 | (kt slot) |
1070 | (lp slots))) | |
1071 | (_ (kf))))) | |
1072 | ||
1073 | (define (class-slot-definition class slot-name) | |
1074 | (unless (class? class) | |
1075 | (scm-error 'wrong-type-arg #f "Not a class: ~S" (list class) #f)) | |
1076 | (%class-slot-definition class slot-name | |
1077 | (lambda (slot) slot) | |
1078 | (lambda () #f))) | |
ade4cf4c AW |
1079 | |
1080 | (define (slot-ref obj slot-name) | |
1081 | "Return the value from @var{obj}'s slot with the nam var{slot_name}." | |
c4974c57 AW |
1082 | (let ((class (class-of obj))) |
1083 | (define (slot-value slot) | |
1084 | (cond | |
2a3ef7c4 | 1085 | ((%slot-definition-slot-ref slot) |
c4974c57 AW |
1086 | => (lambda (slot-ref) (slot-ref obj))) |
1087 | (else | |
2a3ef7c4 | 1088 | (struct-ref obj (%slot-definition-index slot))))) |
c4974c57 AW |
1089 | (define (have-slot slot) |
1090 | (let ((val (slot-value slot))) | |
1091 | (if (unbound? val) | |
1092 | (slot-unbound class obj slot-name) | |
1093 | val))) | |
1094 | (define (no-slot) | |
1095 | (unless (symbol? slot-name) | |
1096 | (scm-error 'wrong-type-arg #f "Not a symbol: ~S" | |
1097 | (list slot-name) #f)) | |
1098 | (let ((val (slot-missing class obj slot-name))) | |
1099 | (if (unbound? val) | |
1100 | (slot-unbound class obj slot-name) | |
1101 | val))) | |
1102 | (%class-slot-definition class slot-name have-slot no-slot))) | |
ade4cf4c AW |
1103 | |
1104 | (define (slot-set! obj slot-name value) | |
1105 | "Set the slot named @var{slot_name} of @var{obj} to @var{value}." | |
c4974c57 AW |
1106 | (let ((class (class-of obj))) |
1107 | (define (have-slot slot) | |
1108 | (cond | |
2a3ef7c4 | 1109 | ((%slot-definition-slot-set! slot) |
c4974c57 AW |
1110 | => (lambda (slot-set!) (slot-set! obj value))) |
1111 | (else | |
2a3ef7c4 | 1112 | (struct-set! obj (%slot-definition-index slot) value)))) |
c4974c57 AW |
1113 | (define (no-slot) |
1114 | (unless (symbol? slot-name) | |
1115 | (scm-error 'wrong-type-arg #f "Not a symbol: ~S" | |
1116 | (list slot-name) #f)) | |
1117 | (slot-missing class obj slot-name value)) | |
1118 | ||
1119 | (%class-slot-definition class slot-name have-slot no-slot))) | |
ade4cf4c AW |
1120 | |
1121 | (define (slot-bound? obj slot-name) | |
1122 | "Return the value from @var{obj}'s slot with the nam var{slot_name}." | |
c4974c57 AW |
1123 | (let ((class (class-of obj))) |
1124 | (define (slot-value slot) | |
1125 | (cond | |
2a3ef7c4 | 1126 | ((%slot-definition-slot-ref slot) |
c4974c57 AW |
1127 | => (lambda (slot-ref) (slot-ref obj))) |
1128 | (else | |
2a3ef7c4 | 1129 | (struct-ref obj (%slot-definition-index slot))))) |
c4974c57 AW |
1130 | (define (have-slot slot) |
1131 | (not (unbound? (slot-value slot)))) | |
1132 | (define (no-slot) | |
1133 | (unless (symbol? slot-name) | |
1134 | (scm-error 'wrong-type-arg #f "Not a symbol: ~S" | |
1135 | (list slot-name) #f)) | |
1136 | (let ((val (slot-missing class obj slot-name))) | |
1137 | (if (unbound? val) | |
1138 | (slot-unbound class obj slot-name) | |
1139 | val))) | |
1140 | (%class-slot-definition class slot-name have-slot no-slot))) | |
ade4cf4c AW |
1141 | |
1142 | (define (slot-exists? obj slot-name) | |
1143 | "Return @code{#t} if @var{obj} has a slot named @var{slot_name}." | |
c4974c57 AW |
1144 | (define (have-slot slot) #t) |
1145 | (define (no-slot) | |
1146 | (unless (symbol? slot-name) | |
1147 | (scm-error 'wrong-type-arg #f "Not a symbol: ~S" | |
1148 | (list slot-name) #f)) | |
1149 | #f) | |
1150 | (%class-slot-definition (class-of obj) slot-name have-slot no-slot)) | |
ade4cf4c | 1151 | |
2bcb278a AW |
1152 | (begin-deprecated |
1153 | (define (check-slot-args class obj slot-name) | |
1154 | (unless (eq? class (class-of obj)) | |
1155 | (scm-error 'wrong-type-arg #f "~S is not the class of ~S" | |
1156 | (list class obj) #f)) | |
1157 | (unless (symbol? slot-name) | |
1158 | (scm-error 'wrong-type-arg #f "Not a symbol: ~S" | |
1159 | (list slot-name) #f))) | |
1160 | ||
1161 | (define (slot-ref-using-class class obj slot-name) | |
1162 | (issue-deprecation-warning "slot-ref-using-class is deprecated. " | |
1163 | "Use slot-ref instead.") | |
1164 | (check-slot-args class obj slot-name) | |
1165 | (slot-ref obj slot-name)) | |
1166 | ||
1167 | (define (slot-set-using-class! class obj slot-name value) | |
1168 | (issue-deprecation-warning "slot-set-using-class! is deprecated. " | |
1169 | "Use slot-set! instead.") | |
1170 | (check-slot-args class obj slot-name) | |
1171 | (slot-set! obj slot-name value)) | |
1172 | ||
1173 | (define (slot-bound-using-class? class obj slot-name) | |
1174 | (issue-deprecation-warning "slot-bound-using-class? is deprecated. " | |
1175 | "Use slot-bound? instead.") | |
1176 | (check-slot-args class obj slot-name) | |
1177 | (slot-bound? obj slot-name)) | |
1178 | ||
1179 | (define (slot-exists-using-class? class obj slot-name) | |
1180 | (issue-deprecation-warning "slot-exists-using-class? is deprecated. " | |
1181 | "Use slot-exists? instead.") | |
1182 | (check-slot-args class obj slot-name) | |
1183 | (slot-exists? obj slot-name))) | |
1184 | ||
b89432ff AW |
1185 | |
1186 | \f | |
1187 | ||
1188 | ;;; | |
1189 | ;;; Method accessors. | |
1190 | ;;; | |
48c981c9 AW |
1191 | (define (method-generic-function obj) |
1192 | "Return the generic function for the method @var{obj}." | |
1193 | (unless (is-a? obj <method>) | |
1194 | (scm-error 'wrong-type-arg #f "Not a method: ~S" | |
1195 | (list obj) #f)) | |
1196 | (slot-ref obj 'generic-function)) | |
1197 | ||
1198 | (define (method-specializers obj) | |
1199 | "Return specializers of the method @var{obj}." | |
1200 | (unless (is-a? obj <method>) | |
1201 | (scm-error 'wrong-type-arg #f "Not a method: ~S" | |
1202 | (list obj) #f)) | |
1203 | (slot-ref obj 'specializers)) | |
1204 | ||
1205 | (define (method-procedure obj) | |
1206 | "Return the procedure of the method @var{obj}." | |
1207 | (unless (is-a? obj <method>) | |
1208 | (scm-error 'wrong-type-arg #f "Not a method: ~S" | |
1209 | (list obj) #f)) | |
1210 | (slot-ref obj 'procedure)) | |
1211 | ||
b89432ff AW |
1212 | |
1213 | \f | |
1214 | ||
1215 | ;;; | |
1216 | ;;; Generic functions! | |
e0590e7c AW |
1217 | ;;; |
1218 | ;;; Generic functions have an applicable-methods cache associated with | |
1219 | ;;; them. Every distinct set of types that is dispatched through a | |
0d96acac AW |
1220 | ;;; generic adds an entry to the cache. A composite dispatch procedure |
1221 | ;;; is recomputed every time an entry gets added to the cache, or when | |
1222 | ;;; the cache is invalidated. | |
1223 | ;;; | |
1224 | ;;; In steady-state, this dispatch procedure is never regenerated; but | |
1225 | ;;; during warm-up there is some churn. | |
e0590e7c AW |
1226 | ;;; |
1227 | ;;; So what is the deal if warm-up happens in a multithreaded context? | |
1228 | ;;; There is indeed a window between missing the cache for a certain set | |
1229 | ;;; of arguments, and then updating the cache with the newly computed | |
1230 | ;;; applicable methods. One of the updaters is liable to lose their new | |
1231 | ;;; entry. | |
1232 | ;;; | |
1233 | ;;; This is actually OK though, because a subsequent cache miss for the | |
1234 | ;;; race loser will just cause memoization to try again. The cache will | |
0d96acac | 1235 | ;;; eventually be consistent. We're not mutating the old part of the |
e0590e7c AW |
1236 | ;;; cache, just consing on the new entry. |
1237 | ;;; | |
1238 | ;;; It doesn't even matter if the dispatch procedure and the cache are | |
1239 | ;;; inconsistent -- most likely the type-set that lost the dispatch | |
1240 | ;;; procedure race will simply re-trigger a memoization, but since the | |
1241 | ;;; winner isn't in the effective-methods cache, it will likely also | |
1242 | ;;; re-trigger a memoization, and the cache will finally be consistent. | |
1243 | ;;; As you can see there is a possibility for ping-pong effects, but | |
1244 | ;;; it's unlikely given the shortness of the window between slot-set! | |
0d96acac AW |
1245 | ;;; invocations. |
1246 | ;;; | |
1247 | ;;; We probably do need to use atomic access primitives to correctly | |
1248 | ;;; handle concurrency, but that's a more general Guile concern. | |
1249 | ;;; | |
e0590e7c | 1250 | |
0d96acac AW |
1251 | (define-syntax arity-case |
1252 | (lambda (x) | |
1253 | (syntax-case x () | |
1254 | ;; (arity-case n 2 foo bar) | |
1255 | ;; => (case n | |
1256 | ;; ((0) (foo)) | |
1257 | ;; ((1) (foo a)) | |
1258 | ;; ((2) (foo a b)) | |
1259 | ;; (else bar)) | |
1260 | ((arity-case n max form alternate) | |
1261 | (let ((max (syntax->datum #'max))) | |
1262 | #`(case n | |
1263 | #,@(let lp ((n 0)) | |
1264 | (let ((ids (map (lambda (n) | |
1265 | (let* ((n (+ (char->integer #\a) n)) | |
1266 | (c (integer->char n))) | |
1267 | (datum->syntax #'here (symbol c)))) | |
1268 | (iota n)))) | |
1269 | #`(((#,n) (form #,@ids)) | |
1270 | . #,(if (< n max) | |
1271 | (lp (1+ n)) | |
1272 | #'())))) | |
1273 | (else alternate))))))) | |
1274 | ||
1275 | ;;; | |
1276 | ;;; These dispatchers are set as the "procedure" field of <generic> | |
1277 | ;;; instances. Unlike CLOS, in GOOPS a generic function can have | |
1278 | ;;; multiple arities. | |
1279 | ;;; | |
1280 | ;;; We pre-generate fast dispatchers for applications of up to 20 | |
1281 | ;;; arguments. More arguments than that will go through slower generic | |
1282 | ;;; routines that cons arguments into a rest list. | |
1283 | ;;; | |
1284 | (define (multiple-arity-dispatcher fv miss) | |
1285 | (define-syntax dispatch | |
1286 | (lambda (x) | |
1287 | (define (build-clauses args) | |
1288 | (let ((len (length (syntax->datum args)))) | |
1289 | #`((#,args ((vector-ref fv #,len) . #,args)) | |
1290 | . #,(syntax-case args () | |
1291 | (() #'()) | |
1292 | ((arg ... _) (build-clauses #'(arg ...))))))) | |
1293 | (syntax-case x () | |
1294 | ((dispatch arg ...) | |
1295 | #`(case-lambda | |
1296 | #,@(build-clauses #'(arg ...)) | |
1297 | (args (apply miss args))))))) | |
1298 | (arity-case (vector-length fv) 20 dispatch | |
1299 | (lambda args | |
1300 | (let ((nargs (length args))) | |
1301 | (if (< nargs (vector-length fv)) | |
1302 | (apply (vector-ref fv nargs) args) | |
1303 | (apply miss args)))))) | |
1304 | ||
1305 | ;;; | |
1306 | ;;; The above multiple-arity-dispatcher is entirely sufficient, and | |
1307 | ;;; should be fast enough. Still, for no good reason we also have an | |
1308 | ;;; arity dispatcher for generics that are only called with one arity. | |
1309 | ;;; | |
1310 | (define (single-arity-dispatcher f nargs miss) | |
1311 | (define-syntax-rule (dispatch arg ...) | |
1312 | (case-lambda | |
1313 | ((arg ...) (f arg ...)) | |
1314 | (args (apply miss args)))) | |
1315 | (arity-case nargs 20 dispatch | |
1316 | (lambda args | |
1317 | (if (eqv? (length args) nargs) | |
1318 | (apply f args) | |
1319 | (apply miss args))))) | |
1320 | ||
1321 | ;;; | |
1322 | ;;; The guts of generic function dispatch are here. Once we've selected | |
1323 | ;;; an arity, we need to map from arguments to effective method. Until | |
1324 | ;;; we have `eqv?' specializers, this map is entirely a function of the | |
1325 | ;;; types (classes) of the arguments. So, we look in the cache to see | |
1326 | ;;; if we have seen this set of concrete types, and if so we apply the | |
1327 | ;;; previously computed effective method. Otherwise we miss the cache, | |
1328 | ;;; so we'll have to compute the right answer for this set of types, add | |
1329 | ;;; the mapping to the cache, and apply the newly computed method. | |
1330 | ;;; | |
1331 | ;;; The cached mapping is invalidated whenever a new method is defined | |
1332 | ;;; on this generic, or whenever the class hierarchy of any method | |
1333 | ;;; specializer changes. | |
1334 | ;;; | |
1335 | (define (single-arity-cache-dispatch cache nargs cache-miss) | |
1336 | (match cache | |
1337 | (() cache-miss) | |
1338 | ((#(len types rest? cmethod nargs*) . cache) | |
1339 | (define (type-ref n) | |
1340 | (and (< n len) (list-ref types n))) | |
1341 | (cond | |
1342 | ((eqv? nargs nargs*) | |
1343 | (let ((cache-miss (single-arity-cache-dispatch cache nargs cache-miss))) | |
1344 | (define-syntax args-match? | |
1345 | (syntax-rules () | |
1346 | ((args-match?) #t) | |
1347 | ((args-match? (arg type) (arg* type*) ...) | |
1348 | ;; Check that the arg has the exact type that we saw. It | |
1349 | ;; could be that `type' is #f, which indicates the end of | |
1350 | ;; the specializers list. Once all specializers have been | |
1351 | ;; examined, we don't need to look at any more arguments | |
1352 | ;; to know that this is a cache hit. | |
1353 | (or (not type) | |
1354 | (and (eq? (class-of arg) type) | |
1355 | (args-match? (arg* type*) ...)))))) | |
1356 | (define-syntax dispatch | |
1357 | (lambda (x) | |
1358 | (define (bind-types types k) | |
1359 | (let lp ((types types) (n 0)) | |
1360 | (syntax-case types () | |
1361 | (() (k)) | |
1362 | ((type . types) | |
1363 | #`(let ((type (type-ref #,n))) | |
1364 | #,(lp #'types (1+ n))))))) | |
1365 | (syntax-case x () | |
1366 | ((dispatch arg ...) | |
1367 | (with-syntax (((type ...) (generate-temporaries #'(arg ...)))) | |
1368 | (bind-types | |
1369 | #'(type ...) | |
1370 | (lambda () | |
1371 | #'(lambda (arg ...) | |
1372 | (if (args-match? (arg type) ...) | |
1373 | (cmethod arg ...) | |
1374 | (cache-miss arg ...)))))))))) | |
1375 | (arity-case nargs 20 dispatch | |
1376 | (lambda args | |
1377 | (define (args-match? args) | |
1378 | (let lp ((args args) (types types)) | |
1379 | (match types | |
1380 | ((type . types) | |
1381 | (let ((arg (car args)) | |
1382 | (args (cdr args))) | |
1383 | (and (eq? type (class-of arg)) | |
1384 | (lp args types)))) | |
1385 | (_ #t)))) | |
1386 | (if (args-match? args) | |
1387 | (apply cmethod args) | |
1388 | (apply cache-miss args)))))) | |
1389 | (else | |
1390 | (single-arity-cache-dispatch cache nargs cache-miss)))))) | |
1391 | ||
1392 | (define (compute-generic-function-dispatch-procedure gf) | |
1393 | (define (seen-arities cache) | |
1394 | (let lp ((arities 0) (cache cache)) | |
1395 | (match cache | |
1396 | (() arities) | |
1397 | ((#(_ _ _ _ nargs) . cache) | |
1398 | (lp (logior arities (ash 1 nargs)) cache))))) | |
1399 | (define (cache-miss . args) | |
1400 | (memoize-generic-function-application! gf args) | |
1401 | (apply gf args)) | |
1402 | (let* ((cache (slot-ref gf 'effective-methods)) | |
1403 | (arities (seen-arities cache)) | |
1404 | (max-arity (let lp ((max -1)) | |
1405 | (if (< arities (ash 1 (1+ max))) | |
1406 | max | |
1407 | (lp (1+ max)))))) | |
1408 | (cond | |
1409 | ((= max-arity -1) | |
1410 | ;; Nothing in the cache. | |
1411 | cache-miss) | |
1412 | ((= arities (ash 1 max-arity)) | |
1413 | ;; Only one arity in the cache. | |
1414 | (let ((nargs (match cache ((#(_ _ _ _ nargs) . _) nargs)))) | |
1415 | (let ((f (single-arity-cache-dispatch cache nargs cache-miss))) | |
1416 | (single-arity-dispatcher f nargs cache-miss)))) | |
1417 | (else | |
1418 | ;; Multiple arities. | |
1419 | (let ((fv (make-vector (1+ max-arity) #f))) | |
1420 | (let lp ((n 0)) | |
1421 | (when (<= n max-arity) | |
1422 | (let ((f (single-arity-cache-dispatch cache n cache-miss))) | |
1423 | (vector-set! fv n f) | |
1424 | (lp (1+ n))))) | |
1425 | (multiple-arity-dispatcher fv cache-miss)))))) | |
1426 | ||
1427 | (define (recompute-generic-function-dispatch-procedure! gf) | |
1428 | (slot-set! gf 'procedure | |
1429 | (compute-generic-function-dispatch-procedure gf))) | |
e0590e7c AW |
1430 | |
1431 | (define (memoize-effective-method! gf args applicable) | |
1432 | (define (first-n ls n) | |
1433 | (if (or (zero? n) (null? ls)) | |
1434 | '() | |
1435 | (cons (car ls) (first-n (cdr ls) (- n 1))))) | |
1436 | (define (parse n ls) | |
1437 | (cond ((null? ls) | |
1438 | (memoize n #f (map class-of args))) | |
1439 | ((= n (slot-ref gf 'n-specialized)) | |
1440 | (memoize n #t (map class-of (first-n args n)))) | |
1441 | (else | |
1442 | (parse (1+ n) (cdr ls))))) | |
1443 | (define (memoize len rest? types) | |
1444 | (let* ((cmethod (compute-cmethod applicable types)) | |
0d96acac | 1445 | (cache (cons (vector len types rest? cmethod (length args)) |
e0590e7c AW |
1446 | (slot-ref gf 'effective-methods)))) |
1447 | (slot-set! gf 'effective-methods cache) | |
0d96acac | 1448 | (recompute-generic-function-dispatch-procedure! gf) |
e0590e7c AW |
1449 | cmethod)) |
1450 | (parse 0 args)) | |
51fd1cd6 | 1451 | |
e0590e7c | 1452 | ;;; |
0d96acac AW |
1453 | ;;; If a method refers to `next-method' in its body, that method will be |
1454 | ;;; able to dispatch to the next most specific method. The exact | |
1455 | ;;; `next-method' implementation is only known at runtime, as it is a | |
1456 | ;;; function of which precise argument types are being dispatched, which | |
1457 | ;;; might be subclasses of the method's declared specializers. | |
e0590e7c | 1458 | ;;; |
0d96acac AW |
1459 | ;;; Guile implements `next-method' by binding it as a closure variable. |
1460 | ;;; An effective method is bound to a specific `next-method' by the | |
1461 | ;;; `make-procedure' slot of a <method>, which returns the new closure. | |
e0590e7c | 1462 | ;;; |
e0590e7c | 1463 | (define (compute-cmethod methods types) |
0d96acac AW |
1464 | (match methods |
1465 | ((method . methods) | |
1466 | (match (slot-ref method 'make-procedure) | |
1467 | (#f (method-procedure method)) | |
1468 | (make-procedure | |
e0590e7c | 1469 | (make-procedure |
0d96acac AW |
1470 | (match methods |
1471 | (() | |
1472 | (lambda args | |
1473 | (no-next-method (method-generic-function method) args))) | |
1474 | (methods | |
1475 | (compute-cmethod methods types))))))))) | |
e0590e7c AW |
1476 | |
1477 | ;;; | |
1478 | ;;; Memoization | |
1479 | ;;; | |
1480 | ||
0d96acac | 1481 | (define (memoize-generic-function-application! gf args) |
e0590e7c | 1482 | (let ((applicable ((if (eq? gf compute-applicable-methods) |
8dfc0ba5 AW |
1483 | %compute-applicable-methods |
1484 | compute-applicable-methods) | |
1485 | gf args))) | |
e0590e7c AW |
1486 | (cond (applicable |
1487 | (memoize-effective-method! gf args applicable)) | |
8dfc0ba5 AW |
1488 | (else |
1489 | (no-applicable-method gf args))))) | |
e0590e7c | 1490 | |
e0590e7c AW |
1491 | (define no-applicable-method |
1492 | (make <generic> #:name 'no-applicable-method)) | |
1493 | ||
1494 | (%goops-early-init) | |
82ab5090 | 1495 | |
78ec533c | 1496 | ;; Then load the rest of GOOPS |
14f1d9fe | 1497 | |
14f1d9fe | 1498 | \f |
51385517 | 1499 | ;; FIXME: deprecate. |
e0590e7c AW |
1500 | (define min-fixnum (- (expt 2 29))) |
1501 | (define max-fixnum (- (expt 2 29) 1)) | |
14f1d9fe MD |
1502 | |
1503 | ;; | |
1504 | ;; goops-error | |
1505 | ;; | |
1506 | (define (goops-error format-string . args) | |
14f1d9fe MD |
1507 | (scm-error 'goops-error #f format-string args '())) |
1508 | ||
14f1d9fe MD |
1509 | ;;; |
1510 | ;;; {Meta classes} | |
1511 | ;;; | |
1512 | ||
1513 | (define ensure-metaclass-with-supers | |
1514 | (let ((table-of-metas '())) | |
1515 | (lambda (meta-supers) | |
1516 | (let ((entry (assoc meta-supers table-of-metas))) | |
8dfc0ba5 AW |
1517 | (if entry |
1518 | ;; Found a previously created metaclass | |
1519 | (cdr entry) | |
1520 | ;; Create a new meta-class which inherit from "meta-supers" | |
1521 | (let ((new (make <class> #:dsupers meta-supers | |
1522 | #:slots '() | |
1523 | #:name (gensym "metaclass")))) | |
1524 | (set! table-of-metas (cons (cons meta-supers new) table-of-metas)) | |
1525 | new)))))) | |
14f1d9fe | 1526 | |
9d019f9b | 1527 | (define (ensure-metaclass supers) |
14f1d9fe MD |
1528 | (if (null? supers) |
1529 | <class> | |
1530 | (let* ((all-metas (map (lambda (x) (class-of x)) supers)) | |
8dfc0ba5 AW |
1531 | (all-cpls (append-map (lambda (m) |
1532 | (cdr (class-precedence-list m))) | |
af35fc20 | 1533 | all-metas)) |
8dfc0ba5 AW |
1534 | (needed-metas '())) |
1535 | ;; Find the most specific metaclasses. The new metaclass will be | |
1536 | ;; a subclass of these. | |
1537 | (for-each | |
1538 | (lambda (meta) | |
bacc8829 | 1539 | (when (and (not (member meta all-cpls)) |
8dfc0ba5 AW |
1540 | (not (member meta needed-metas))) |
1541 | (set! needed-metas (append needed-metas (list meta))))) | |
1542 | all-metas) | |
1543 | ;; Now return a subclass of the metaclasses we found. | |
1544 | (if (null? (cdr needed-metas)) | |
1545 | (car needed-metas) ; If there's only one, just use it. | |
1546 | (ensure-metaclass-with-supers needed-metas))))) | |
14f1d9fe MD |
1547 | |
1548 | ;;; | |
1549 | ;;; {Classes} | |
1550 | ;;; | |
1551 | ||
1552 | ;;; (define-class NAME (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
1553 | ;;; | |
568174d1 | 1554 | ;;; SLOT-DEFINITION ::= INSTANCE-OF-<SLOT> | (SLOT-NAME OPTION ...) |
14f1d9fe MD |
1555 | ;;; OPTION ::= KEYWORD VALUE |
1556 | ;;; | |
14f1d9fe | 1557 | |
b3501b80 | 1558 | (define (make-class supers slots . options) |
06d54b3f AW |
1559 | (define (find-duplicate l) |
1560 | (match l | |
1561 | (() #f) | |
1562 | ((head . tail) | |
1563 | (if (memq head tail) | |
1564 | head | |
1565 | (find-duplicate tail))))) | |
568174d1 AW |
1566 | (define (slot-spec->name slot-spec) |
1567 | (match slot-spec | |
1568 | (((? symbol? name) . args) name) | |
1569 | ;; We can get here when redefining classes. | |
2a3ef7c4 | 1570 | ((? slot? slot) (%slot-definition-name slot)))) |
06d54b3f | 1571 | |
567a6d1e | 1572 | (let* ((name (get-keyword #:name options *unbound*)) |
9d019f9b AW |
1573 | (supers (if (not (or-map (lambda (class) |
1574 | (memq <object> | |
1575 | (class-precedence-list class))) | |
1576 | supers)) | |
1577 | (append supers (list <object>)) | |
1578 | supers)) | |
1579 | (metaclass (or (get-keyword #:metaclass options #f) | |
1580 | (ensure-metaclass supers)))) | |
1581 | ||
1582 | ;; Verify that all direct slots are different and that we don't inherit | |
1583 | ;; several time from the same class | |
1584 | (let ((tmp1 (find-duplicate supers)) | |
568174d1 | 1585 | (tmp2 (find-duplicate (map slot-spec->name slots)))) |
9d019f9b AW |
1586 | (if tmp1 |
1587 | (goops-error "make-class: super class ~S is duplicate in class ~S" | |
1588 | tmp1 name)) | |
1589 | (if tmp2 | |
1590 | (goops-error "make-class: slot ~S is duplicate in class ~S" | |
1591 | tmp2 name))) | |
1592 | ||
1593 | ;; Everything seems correct, build the class | |
1594 | (apply make metaclass | |
1595 | #:dsupers supers | |
8dfc0ba5 | 1596 | #:slots slots |
9d019f9b AW |
1597 | #:name name |
1598 | options))) | |
14f1d9fe MD |
1599 | |
1600 | ;;; (class (SUPER ...) SLOT-DEFINITION ... OPTION ...) | |
1601 | ;;; | |
1602 | ;;; SLOT-DEFINITION ::= SLOT-NAME | (SLOT-NAME OPTION ...) | |
1603 | ;;; OPTION ::= KEYWORD VALUE | |
1604 | ;;; | |
f840ed25 AW |
1605 | (define-syntax class |
1606 | (lambda (x) | |
1607 | (define (parse-options options) | |
1608 | (syntax-case options () | |
1609 | (() #'()) | |
1610 | ((kw arg . options) (keyword? (syntax->datum #'kw)) | |
1611 | (with-syntax ((options (parse-options #'options))) | |
1612 | (syntax-case #'kw () | |
1613 | (#:init-form | |
1614 | #'(kw 'arg #:init-thunk (lambda () arg) . options)) | |
1615 | (_ | |
1616 | #'(kw arg . options))))))) | |
1617 | (define (check-valid-kwargs args) | |
1618 | (syntax-case args () | |
1619 | (() #'()) | |
1620 | ((kw arg . args) (keyword? (syntax->datum #'kw)) | |
1621 | #`(kw arg . #,(check-valid-kwargs #'args))))) | |
1622 | (define (parse-slots-and-kwargs args) | |
1623 | (syntax-case args () | |
1624 | (() | |
1625 | #'(() ())) | |
1626 | ((kw . _) (keyword? (syntax->datum #'kw)) | |
1627 | #`(() #,(check-valid-kwargs args))) | |
1628 | (((name option ...) args ...) | |
1629 | (with-syntax (((slots kwargs) (parse-slots-and-kwargs #'(args ...))) | |
1630 | ((option ...) (parse-options #'(option ...)))) | |
1631 | #'(((list 'name option ...) . slots) kwargs))) | |
1632 | ((name args ...) (symbol? (syntax->datum #'name)) | |
1633 | (with-syntax (((slots kwargs) (parse-slots-and-kwargs #'(args ...)))) | |
1634 | #'(('(name) . slots) kwargs))))) | |
1635 | (syntax-case x () | |
1636 | ((class (super ...) arg ...) | |
1637 | (with-syntax ((((slot-def ...) (option ...)) | |
1638 | (parse-slots-and-kwargs #'(arg ...)))) | |
1639 | #'(make-class (list super ...) | |
1640 | (list slot-def ...) | |
1641 | option ...)))))) | |
14f1d9fe | 1642 | |
b3501b80 AW |
1643 | (define-syntax define-class-pre-definition |
1644 | (lambda (x) | |
1645 | (syntax-case x () | |
1646 | ((_ (k arg rest ...) out ...) | |
0dd8493c AW |
1647 | (keyword? (syntax->datum #'k)) |
1648 | (case (syntax->datum #'k) | |
b3501b80 | 1649 | ((#:getter #:setter) |
0dd8493c AW |
1650 | #'(define-class-pre-definition (rest ...) |
1651 | out ... | |
bacc8829 AW |
1652 | (when (or (not (defined? 'arg)) |
1653 | (not (is-a? arg <generic>))) | |
1654 | (toplevel-define! | |
1655 | 'arg | |
1656 | (ensure-generic (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 1657 | ((#:accessor) |
0dd8493c AW |
1658 | #'(define-class-pre-definition (rest ...) |
1659 | out ... | |
bacc8829 AW |
1660 | (when (or (not (defined? 'arg)) |
1661 | (not (is-a? arg <accessor>))) | |
1662 | (toplevel-define! | |
1663 | 'arg | |
1664 | (ensure-accessor (if (defined? 'arg) arg #f) 'arg))))) | |
b3501b80 | 1665 | (else |
0dd8493c | 1666 | #'(define-class-pre-definition (rest ...) out ...)))) |
b3501b80 | 1667 | ((_ () out ...) |
0dd8493c | 1668 | #'(begin out ...))))) |
8dfc0ba5 | 1669 | |
b3501b80 AW |
1670 | ;; Some slot options require extra definitions to be made. In |
1671 | ;; particular, we want to make sure that the generic function objects | |
1672 | ;; which represent accessors exist before `make-class' tries to add | |
1673 | ;; methods to them. | |
1674 | (define-syntax define-class-pre-definitions | |
1675 | (lambda (x) | |
1676 | (syntax-case x () | |
1677 | ((_ () out ...) | |
0dd8493c | 1678 | #'(begin out ...)) |
b3501b80 | 1679 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
1680 | (keyword? (syntax->datum #'slot)) |
1681 | #'(begin out ...)) | |
b3501b80 | 1682 | ((_ (slot rest ...) out ...) |
0dd8493c AW |
1683 | (identifier? #'slot) |
1684 | #'(define-class-pre-definitions (rest ...) | |
1685 | out ...)) | |
b3501b80 | 1686 | ((_ ((slotname slotopt ...) rest ...) out ...) |
8dfc0ba5 | 1687 | #'(define-class-pre-definitions (rest ...) |
0dd8493c | 1688 | out ... (define-class-pre-definition (slotopt ...))))))) |
b3501b80 | 1689 | |
0c65f52c AW |
1690 | (define-syntax-rule (define-class name supers slot ...) |
1691 | (begin | |
1692 | (define-class-pre-definitions (slot ...)) | |
1693 | (if (and (defined? 'name) | |
1694 | (is-a? name <class>) | |
1695 | (memq <object> (class-precedence-list name))) | |
1696 | (class-redefinition name | |
1697 | (class supers slot ... #:name 'name)) | |
1698 | (toplevel-define! 'name (class supers slot ... #:name 'name))))) | |
8dfc0ba5 | 1699 | |
0c65f52c AW |
1700 | (define-syntax-rule (standard-define-class arg ...) |
1701 | (define-class arg ...)) | |
14f1d9fe MD |
1702 | |
1703 | ;;; | |
1704 | ;;; {Generic functions and accessors} | |
1705 | ;;; | |
1706 | ||
1d83f47e AW |
1707 | ;; Apparently the desired semantics are that we extend previous |
1708 | ;; procedural definitions, but that if `name' was already a generic, we | |
1709 | ;; overwrite its definition. | |
7cb88cbc AW |
1710 | (define-syntax define-generic |
1711 | (lambda (x) | |
1712 | (syntax-case x () | |
1713 | ((define-generic name) (symbol? (syntax->datum #'name)) | |
1714 | #'(define name | |
1715 | (if (and (defined? 'name) (is-a? name <generic>)) | |
1716 | (make <generic> #:name 'name) | |
1717 | (ensure-generic (if (defined? 'name) name #f) 'name))))))) | |
1718 | ||
1719 | (define-syntax define-extended-generic | |
1720 | (lambda (x) | |
1721 | (syntax-case x () | |
1722 | ((define-extended-generic name val) (symbol? (syntax->datum #'name)) | |
1723 | #'(define name (make-extended-generic val 'name)))))) | |
1724 | ||
1725 | (define-syntax define-extended-generics | |
1726 | (lambda (x) | |
1727 | (define (id-append ctx a b) | |
1728 | (datum->syntax ctx (symbol-append (syntax->datum a) (syntax->datum b)))) | |
1729 | (syntax-case x () | |
1730 | ((define-extended-generic (name ...) #:prefix (prefix ...)) | |
1731 | (and (and-map symbol? (syntax->datum #'(name ...))) | |
1732 | (and-map symbol? (syntax->datum #'(prefix ...)))) | |
1733 | (with-syntax ((((val ...)) (map (lambda (name) | |
1734 | (map (lambda (prefix) | |
1735 | (id-append name prefix name)) | |
1736 | #'(prefix ...))) | |
1737 | #'(name ...)))) | |
1738 | #'(begin | |
1739 | (define-extended-generic name (list val ...)) | |
1740 | ...)))))) | |
bbf8d523 | 1741 | |
a8c10aa1 AW |
1742 | (define* (make-generic #:optional name) |
1743 | (make <generic> #:name name)) | |
14f1d9fe | 1744 | |
a8c10aa1 AW |
1745 | (define* (make-extended-generic gfs #:optional name) |
1746 | (let* ((gfs (if (list? gfs) gfs (list gfs))) | |
8dfc0ba5 | 1747 | (gws? (any (lambda (gf) (is-a? gf <generic-with-setter>)) gfs))) |
bbf8d523 | 1748 | (let ((ans (if gws? |
8dfc0ba5 AW |
1749 | (let* ((sname (and name (make-setter-name name))) |
1750 | (setters | |
1751 | (append-map (lambda (gf) | |
1752 | (if (is-a? gf <generic-with-setter>) | |
1753 | (list (ensure-generic (setter gf) | |
1754 | sname)) | |
1755 | '())) | |
1756 | gfs)) | |
1757 | (es (make <extended-generic-with-setter> | |
1758 | #:name name | |
1759 | #:extends gfs | |
1760 | #:setter (make <extended-generic> | |
1761 | #:name sname | |
1762 | #:extends setters)))) | |
1763 | (extended-by! setters (setter es)) | |
1764 | es) | |
1765 | (make <extended-generic> | |
1766 | #:name name | |
1767 | #:extends gfs)))) | |
bbf8d523 MD |
1768 | (extended-by! gfs ans) |
1769 | ans))) | |
1770 | ||
1771 | (define (extended-by! gfs eg) | |
1772 | (for-each (lambda (gf) | |
8dfc0ba5 AW |
1773 | (slot-set! gf 'extended-by |
1774 | (cons eg (slot-ref gf 'extended-by)))) | |
1775 | gfs) | |
eddd81f4 | 1776 | (invalidate-method-cache! eg)) |
bbf8d523 MD |
1777 | |
1778 | (define (not-extended-by! gfs eg) | |
1779 | (for-each (lambda (gf) | |
8dfc0ba5 AW |
1780 | (slot-set! gf 'extended-by |
1781 | (delq! eg (slot-ref gf 'extended-by)))) | |
1782 | gfs) | |
eddd81f4 | 1783 | (invalidate-method-cache! eg)) |
bbf8d523 | 1784 | |
a8c10aa1 AW |
1785 | (define* (ensure-generic old-definition #:optional name) |
1786 | (cond ((is-a? old-definition <generic>) old-definition) | |
1787 | ((procedure-with-setter? old-definition) | |
1788 | (make <generic-with-setter> | |
1789 | #:name name | |
1790 | #:default (procedure old-definition) | |
1791 | #:setter (setter old-definition))) | |
1792 | ((procedure? old-definition) | |
1793 | (if (generic-capability? old-definition) old-definition | |
1794 | (make <generic> #:name name #:default old-definition))) | |
1795 | (else (make <generic> #:name name)))) | |
14f1d9fe | 1796 | |
1d83f47e | 1797 | ;; same semantics as <generic> |
0c65f52c AW |
1798 | (define-syntax-rule (define-accessor name) |
1799 | (define name | |
1800 | (cond ((not (defined? 'name)) (ensure-accessor #f 'name)) | |
1801 | ((is-a? name <accessor>) (make <accessor> #:name 'name)) | |
1802 | (else (ensure-accessor name 'name))))) | |
c31142ee | 1803 | |
14f1d9fe MD |
1804 | (define (make-setter-name name) |
1805 | (string->symbol (string-append "setter:" (symbol->string name)))) | |
1806 | ||
a8c10aa1 AW |
1807 | (define* (make-accessor #:optional name) |
1808 | (make <accessor> | |
1809 | #:name name | |
1810 | #:setter (make <generic> | |
1811 | #:name (and name (make-setter-name name))))) | |
1812 | ||
1813 | (define* (ensure-accessor proc #:optional name) | |
1814 | (cond ((and (is-a? proc <accessor>) | |
1815 | (is-a? (setter proc) <generic>)) | |
1816 | proc) | |
1817 | ((is-a? proc <generic-with-setter>) | |
1818 | (upgrade-accessor proc (setter proc))) | |
1819 | ((is-a? proc <generic>) | |
1820 | (upgrade-accessor proc (make-generic name))) | |
1821 | ((procedure-with-setter? proc) | |
1822 | (make <accessor> | |
1823 | #:name name | |
1824 | #:default (procedure proc) | |
1825 | #:setter (ensure-generic (setter proc) name))) | |
1826 | ((procedure? proc) | |
1827 | (ensure-accessor (if (generic-capability? proc) | |
1828 | (make <generic> #:name name #:default proc) | |
1829 | (ensure-generic proc name)) | |
1830 | name)) | |
1831 | (else | |
1832 | (make-accessor name)))) | |
14f1d9fe | 1833 | |
f8af5c6d | 1834 | (define (upgrade-accessor generic setter) |
bbf8d523 | 1835 | (let ((methods (slot-ref generic 'methods)) |
8dfc0ba5 AW |
1836 | (gws (make (if (is-a? generic <extended-generic>) |
1837 | <extended-generic-with-setter> | |
1838 | <accessor>) | |
1839 | #:name (generic-function-name generic) | |
1840 | #:extended-by (slot-ref generic 'extended-by) | |
1841 | #:setter setter))) | |
bacc8829 AW |
1842 | (when (is-a? generic <extended-generic>) |
1843 | (let ((gfs (slot-ref generic 'extends))) | |
1844 | (not-extended-by! gfs generic) | |
1845 | (slot-set! gws 'extends gfs) | |
1846 | (extended-by! gfs gws))) | |
14f1d9fe MD |
1847 | ;; Steal old methods |
1848 | (for-each (lambda (method) | |
8dfc0ba5 AW |
1849 | (slot-set! method 'generic-function gws)) |
1850 | methods) | |
14f1d9fe | 1851 | (slot-set! gws 'methods methods) |
eddd81f4 | 1852 | (invalidate-method-cache! gws) |
14f1d9fe MD |
1853 | gws)) |
1854 | ||
1855 | ;;; | |
1856 | ;;; {Methods} | |
1857 | ;;; | |
1858 | ||
3a0d1412 AW |
1859 | ;; Note: `a' and `b' can have unequal lengths (i.e. one can be one |
1860 | ;; element longer than the other when we have a dotted parameter | |
1861 | ;; list). For instance, with the call | |
1862 | ;; | |
1863 | ;; (M 1) | |
1864 | ;; | |
1865 | ;; with | |
1866 | ;; | |
1867 | ;; (define-method M (a . l) ....) | |
1868 | ;; (define-method M (a) ....) | |
8dfc0ba5 | 1869 | ;; |
3a0d1412 | 1870 | ;; we consider that the second method is more specific. |
8dfc0ba5 | 1871 | ;; |
3a0d1412 AW |
1872 | ;; Precondition: `a' and `b' are methods and are applicable to `types'. |
1873 | (define (%method-more-specific? a b types) | |
1874 | (let lp ((a-specializers (method-specializers a)) | |
1875 | (b-specializers (method-specializers b)) | |
1876 | (types types)) | |
1877 | (cond | |
1878 | ;; (a) less specific than (a b ...) or (a . b) | |
1879 | ((null? a-specializers) #t) | |
1880 | ;; (a b ...) or (a . b) less specific than (a) | |
1881 | ((null? b-specializers) #f) | |
1882 | ;; (a . b) less specific than (a b ...) | |
1883 | ((not (pair? a-specializers)) #f) | |
1884 | ;; (a b ...) more specific than (a . b) | |
1885 | ((not (pair? b-specializers)) #t) | |
1886 | (else | |
1887 | (let ((a-specializer (car a-specializers)) | |
1888 | (b-specializer (car b-specializers)) | |
1889 | (a-specializers (cdr a-specializers)) | |
1890 | (b-specializers (cdr b-specializers)) | |
1891 | (type (car types)) | |
1892 | (types (cdr types))) | |
1893 | (if (eq? a-specializer b-specializer) | |
1894 | (lp a-specializers b-specializers types) | |
1895 | (let lp ((cpl (class-precedence-list type))) | |
1896 | (let ((elt (car cpl))) | |
1897 | (cond | |
1898 | ((eq? a-specializer elt) #t) | |
1899 | ((eq? b-specializer elt) #f) | |
1900 | (else (lp (cdr cpl)))))))))))) | |
1901 | ||
c0a56ec7 AW |
1902 | (define (%sort-applicable-methods methods types) |
1903 | (sort methods (lambda (a b) (%method-more-specific? a b types)))) | |
1904 | ||
48c981c9 AW |
1905 | (define (generic-function-methods obj) |
1906 | "Return the methods of the generic function @var{obj}." | |
1907 | (define (fold-upward method-lists gf) | |
1908 | (cond | |
1909 | ((is-a? gf <extended-generic>) | |
1910 | (let lp ((method-lists method-lists) (gfs (slot-ref gf 'extends))) | |
1911 | (match gfs | |
1912 | (() method-lists) | |
1913 | ((gf . gfs) | |
1914 | (lp (fold-upward (cons (slot-ref gf 'methods) method-lists) gf) | |
1915 | gfs))))) | |
1916 | (else method-lists))) | |
1917 | (define (fold-downward method-lists gf) | |
1918 | (let lp ((method-lists (cons (slot-ref gf 'methods) method-lists)) | |
1919 | (gfs (slot-ref gf 'extended-by))) | |
1920 | (match gfs | |
1921 | (() method-lists) | |
1922 | ((gf . gfs) | |
1923 | (lp (fold-downward method-lists gf) gfs))))) | |
1924 | (unless (is-a? obj <generic>) | |
1925 | (scm-error 'wrong-type-arg #f "Not a generic: ~S" | |
1926 | (list obj) #f)) | |
1927 | (concatenate (fold-downward (fold-upward '() obj) obj))) | |
1928 | ||
c0a56ec7 AW |
1929 | (define (%compute-applicable-methods gf args) |
1930 | (define (method-applicable? m types) | |
1931 | (let lp ((specs (method-specializers m)) (types types)) | |
1932 | (cond | |
1933 | ((null? specs) (null? types)) | |
1934 | ((not (pair? specs)) #t) | |
1935 | ((null? types) #f) | |
1936 | (else | |
1937 | (and (memq (car specs) (class-precedence-list (car types))) | |
1938 | (lp (cdr specs) (cdr types))))))) | |
1939 | (let ((n (length args)) | |
1940 | (types (map class-of args))) | |
1941 | (let lp ((methods (generic-function-methods gf)) | |
1942 | (applicable '())) | |
1943 | (if (null? methods) | |
1944 | (and (not (null? applicable)) | |
1945 | (%sort-applicable-methods applicable types)) | |
1946 | (let ((m (car methods))) | |
1947 | (lp (cdr methods) | |
1948 | (if (method-applicable? m types) | |
1949 | (cons m applicable) | |
1950 | applicable))))))) | |
1951 | ||
1952 | (define compute-applicable-methods %compute-applicable-methods) | |
1953 | ||
2ce560b9 AW |
1954 | (define (toplevel-define! name val) |
1955 | (module-define! (current-module) name val)) | |
1956 | ||
1957 | (define-syntax define-method | |
1958 | (syntax-rules (setter) | |
1959 | ((_ ((setter name) . args) body ...) | |
1960 | (begin | |
bacc8829 AW |
1961 | (when (or (not (defined? 'name)) |
1962 | (not (is-a? name <accessor>))) | |
1963 | (toplevel-define! 'name | |
1964 | (ensure-accessor | |
1965 | (if (defined? 'name) name #f) 'name))) | |
2ce560b9 AW |
1966 | (add-method! (setter name) (method args body ...)))) |
1967 | ((_ (name . args) body ...) | |
1968 | (begin | |
1969 | ;; FIXME: this code is how it always was, but it's quite cracky: | |
1970 | ;; it will only define the generic function if it was undefined | |
1971 | ;; before (ok), or *was defined to #f*. The latter is crack. But | |
1972 | ;; there are bootstrap issues about fixing this -- change it to | |
1973 | ;; (is-a? name <generic>) and see. | |
bacc8829 AW |
1974 | (when (or (not (defined? 'name)) |
1975 | (not name)) | |
1976 | (toplevel-define! 'name (make <generic> #:name 'name))) | |
2ce560b9 | 1977 | (add-method! name (method args body ...)))))) |
14f1d9fe | 1978 | |
47c8983f AW |
1979 | (define-syntax method |
1980 | (lambda (x) | |
d6392715 AW |
1981 | (define (parse-args args) |
1982 | (let lp ((ls args) (formals '()) (specializers '())) | |
47c8983f | 1983 | (syntax-case ls () |
d6392715 | 1984 | (((f s) . rest) |
0dd8493c AW |
1985 | (and (identifier? #'f) (identifier? #'s)) |
1986 | (lp #'rest | |
1987 | (cons #'f formals) | |
1988 | (cons #'s specializers))) | |
d6392715 | 1989 | ((f . rest) |
0dd8493c AW |
1990 | (identifier? #'f) |
1991 | (lp #'rest | |
1992 | (cons #'f formals) | |
1993 | (cons #'<top> specializers))) | |
d6392715 AW |
1994 | (() |
1995 | (list (reverse formals) | |
0dd8493c | 1996 | (reverse (cons #''() specializers)))) |
d6392715 | 1997 | (tail |
0dd8493c AW |
1998 | (identifier? #'tail) |
1999 | (list (append (reverse formals) #'tail) | |
2000 | (reverse (cons #'<top> specializers))))))) | |
47c8983f AW |
2001 | |
2002 | (define (find-free-id exp referent) | |
2003 | (syntax-case exp () | |
2004 | ((x . y) | |
0dd8493c AW |
2005 | (or (find-free-id #'x referent) |
2006 | (find-free-id #'y referent))) | |
47c8983f | 2007 | (x |
0dd8493c AW |
2008 | (identifier? #'x) |
2009 | (let ((id (datum->syntax #'x referent))) | |
2010 | (and (free-identifier=? #'x id) id))) | |
47c8983f AW |
2011 | (_ #f))) |
2012 | ||
2013 | (define (compute-procedure formals body) | |
2014 | (syntax-case body () | |
2015 | ((body0 ...) | |
2016 | (with-syntax ((formals formals)) | |
0dd8493c | 2017 | #'(lambda formals body0 ...))))) |
47c8983f AW |
2018 | |
2019 | (define (->proper args) | |
2020 | (let lp ((ls args) (out '())) | |
2021 | (syntax-case ls () | |
0dd8493c | 2022 | ((x . xs) (lp #'xs (cons #'x out))) |
47c8983f | 2023 | (() (reverse out)) |
0dd8493c | 2024 | (tail (reverse (cons #'tail out)))))) |
47c8983f AW |
2025 | |
2026 | (define (compute-make-procedure formals body next-method) | |
2027 | (syntax-case body () | |
2028 | ((body ...) | |
2029 | (with-syntax ((next-method next-method)) | |
2030 | (syntax-case formals () | |
2031 | ((formal ...) | |
0dd8493c AW |
2032 | #'(lambda (real-next-method) |
2033 | (lambda (formal ...) | |
2034 | (let ((next-method (lambda args | |
2035 | (if (null? args) | |
2036 | (real-next-method formal ...) | |
2037 | (apply real-next-method args))))) | |
2038 | body ...)))) | |
47c8983f | 2039 | (formals |
0dd8493c AW |
2040 | (with-syntax (((formal ...) (->proper #'formals))) |
2041 | #'(lambda (real-next-method) | |
2042 | (lambda formals | |
2043 | (let ((next-method (lambda args | |
2044 | (if (null? args) | |
2045 | (apply real-next-method formal ...) | |
2046 | (apply real-next-method args))))) | |
2047 | body ...)))))))))) | |
47c8983f AW |
2048 | |
2049 | (define (compute-procedures formals body) | |
2050 | ;; So, our use of this is broken, because it operates on the | |
2051 | ;; pre-expansion source code. It's equivalent to just searching | |
2052 | ;; for referent in the datums. Ah well. | |
2053 | (let ((id (find-free-id body 'next-method))) | |
2054 | (if id | |
2055 | ;; return a make-procedure | |
0dd8493c | 2056 | (values #'#f |
47c8983f AW |
2057 | (compute-make-procedure formals body id)) |
2058 | (values (compute-procedure formals body) | |
0dd8493c | 2059 | #'#f)))) |
47c8983f AW |
2060 | |
2061 | (syntax-case x () | |
0dd8493c | 2062 | ((_ args) #'(method args (if #f #f))) |
47c8983f | 2063 | ((_ args body0 body1 ...) |
0dd8493c | 2064 | (with-syntax (((formals (specializer ...)) (parse-args #'args))) |
47c8983f AW |
2065 | (call-with-values |
2066 | (lambda () | |
0dd8493c | 2067 | (compute-procedures #'formals #'(body0 body1 ...))) |
47c8983f AW |
2068 | (lambda (procedure make-procedure) |
2069 | (with-syntax ((procedure procedure) | |
2070 | (make-procedure make-procedure)) | |
0dd8493c AW |
2071 | #'(make <method> |
2072 | #:specializers (cons* specializer ...) | |
2073 | #:formals 'formals | |
2074 | #:body '(body0 body1 ...) | |
2075 | #:make-procedure make-procedure | |
2076 | #:procedure procedure))))))))) | |
14f1d9fe | 2077 | |
ac5185c2 AW |
2078 | ;;; |
2079 | ;;; {Utilities} | |
2080 | ;;; | |
2081 | ;;; These are useful when dealing with method specializers, which might | |
2082 | ;;; have a rest argument. | |
2083 | ;;; | |
2084 | ||
2085 | (define (map* fn . l) ; A map which accepts dotted lists (arg lists | |
2086 | (cond ; must be "isomorph" | |
2087 | ((null? (car l)) '()) | |
2088 | ((pair? (car l)) (cons (apply fn (map car l)) | |
2089 | (apply map* fn (map cdr l)))) | |
2090 | (else (apply fn l)))) | |
2091 | ||
2092 | (define (for-each* fn . l) ; A for-each which accepts dotted lists (arg lists | |
2093 | (cond ; must be "isomorph" | |
2094 | ((null? (car l)) '()) | |
2095 | ((pair? (car l)) (apply fn (map car l)) (apply for-each* fn (map cdr l))) | |
2096 | (else (apply fn l)))) | |
2097 | ||
2098 | (define (length* ls) | |
2099 | (do ((n 0 (+ 1 n)) | |
2100 | (ls ls (cdr ls))) | |
2101 | ((not (pair? ls)) n))) | |
2102 | ||
14f1d9fe MD |
2103 | ;;; |
2104 | ;;; {add-method!} | |
2105 | ;;; | |
2106 | ||
2107 | (define (add-method-in-classes! m) | |
2108 | ;; Add method in all the classes which appears in its specializers list | |
2109 | (for-each* (lambda (x) | |
8dfc0ba5 AW |
2110 | (let ((dm (class-direct-methods x))) |
2111 | (unless (memq m dm) | |
2112 | (struct-set! x class-index-direct-methods (cons m dm))))) | |
2113 | (method-specializers m))) | |
14f1d9fe MD |
2114 | |
2115 | (define (remove-method-in-classes! m) | |
2116 | ;; Remove method in all the classes which appears in its specializers list | |
2117 | (for-each* (lambda (x) | |
8dfc0ba5 AW |
2118 | (struct-set! x |
2119 | class-index-direct-methods | |
2120 | (delv! m (class-direct-methods x)))) | |
2121 | (method-specializers m))) | |
14f1d9fe MD |
2122 | |
2123 | (define (compute-new-list-of-methods gf new) | |
2124 | (let ((new-spec (method-specializers new)) | |
8dfc0ba5 | 2125 | (methods (slot-ref gf 'methods))) |
14f1d9fe MD |
2126 | (let loop ((l methods)) |
2127 | (if (null? l) | |
8dfc0ba5 AW |
2128 | (cons new methods) |
2129 | (if (equal? (method-specializers (car l)) new-spec) | |
2130 | (begin | |
2131 | ;; This spec. list already exists. Remove old method from dependents | |
2132 | (remove-method-in-classes! (car l)) | |
2133 | (set-car! l new) | |
2134 | methods) | |
2135 | (loop (cdr l))))))) | |
14f1d9fe | 2136 | |
eddd81f4 AW |
2137 | (define (method-n-specializers m) |
2138 | (length* (slot-ref m 'specializers))) | |
2139 | ||
2140 | (define (calculate-n-specialized gf) | |
2141 | (fold (lambda (m n) (max n (method-n-specializers m))) | |
2142 | 0 | |
2143 | (generic-function-methods gf))) | |
2144 | ||
2145 | (define (invalidate-method-cache! gf) | |
eddd81f4 | 2146 | (slot-set! gf 'n-specialized (calculate-n-specialized gf)) |
0d96acac | 2147 | (%invalidate-method-cache! gf) |
eddd81f4 AW |
2148 | (for-each (lambda (gf) (invalidate-method-cache! gf)) |
2149 | (slot-ref gf 'extended-by))) | |
2150 | ||
7d38f3d8 AW |
2151 | (define internal-add-method! |
2152 | (method ((gf <generic>) (m <method>)) | |
2153 | (slot-set! m 'generic-function gf) | |
2154 | (slot-set! gf 'methods (compute-new-list-of-methods gf m)) | |
eddd81f4 | 2155 | (invalidate-method-cache! gf) |
7d38f3d8 AW |
2156 | (add-method-in-classes! m) |
2157 | *unspecified*)) | |
14f1d9fe MD |
2158 | |
2159 | (define-generic add-method!) | |
2160 | ||
7d38f3d8 | 2161 | ((method-procedure internal-add-method!) add-method! internal-add-method!) |
14f1d9fe | 2162 | |
71d540f7 | 2163 | (define-method (add-method! (proc <procedure>) (m <method>)) |
14f1d9fe MD |
2164 | (if (generic-capability? proc) |
2165 | (begin | |
8dfc0ba5 AW |
2166 | (enable-primitive-generic! proc) |
2167 | (add-method! proc m)) | |
14f1d9fe MD |
2168 | (next-method))) |
2169 | ||
71d540f7 | 2170 | (define-method (add-method! (pg <primitive-generic>) (m <method>)) |
14f1d9fe MD |
2171 | (add-method! (primitive-generic-generic pg) m)) |
2172 | ||
71d540f7 | 2173 | (define-method (add-method! obj (m <method>)) |
14f1d9fe MD |
2174 | (goops-error "~S is not a valid generic function" obj)) |
2175 | ||
2176 | ;;; | |
2177 | ;;; {Access to meta objects} | |
2178 | ;;; | |
2179 | ||
2180 | ;;; | |
2181 | ;;; Methods | |
2182 | ;;; | |
71d540f7 | 2183 | (define-method (method-source (m <method>)) |
14f1d9fe | 2184 | (let* ((spec (map* class-name (slot-ref m 'specializers))) |
8dfc0ba5 | 2185 | (src (procedure-source (slot-ref m 'procedure)))) |
4e2f1e9e AW |
2186 | (and src |
2187 | (let ((args (cadr src)) | |
2188 | (body (cddr src))) | |
2189 | (cons 'method | |
2190 | (cons (map* list args spec) | |
2191 | body)))))) | |
2192 | ||
2193 | (define-method (method-formals (m <method>)) | |
2194 | (slot-ref m 'formals)) | |
14f1d9fe MD |
2195 | |
2196 | ;;; | |
2197 | ;;; Slots | |
2198 | ;;; | |
14f1d9fe | 2199 | (define (slot-init-function class slot-name) |
2a3ef7c4 AW |
2200 | (%slot-definition-init-thunk (or (class-slot-definition class slot-name) |
2201 | (error "slot not found" slot-name)))) | |
14f1d9fe | 2202 | |
51f66c91 AW |
2203 | (define (accessor-method-slot-definition obj) |
2204 | "Return the slot definition of the accessor @var{obj}." | |
2205 | (slot-ref obj 'slot-definition)) | |
2206 | ||
14f1d9fe MD |
2207 | |
2208 | ;;; | |
2209 | ;;; {Standard methods used by the C runtime} | |
2210 | ;;; | |
2211 | ||
2212 | ;;; Methods to compare objects | |
2213 | ;;; | |
2214 | ||
9f63ce02 AW |
2215 | ;; Have to do this in a strange order because equal? is used in the |
2216 | ;; add-method! implementation; we need to make sure that when the | |
2217 | ;; primitive is extended, that the generic has a method. = | |
2218 | (define g-equal? (make-generic 'equal?)) | |
2219 | ;; When this generic gets called, we will have already checked eq? and | |
2220 | ;; eqv? -- the purpose of this generic is to extend equality. So by | |
2221 | ;; default, there is no extension, thus the #f return. | |
8dfc0ba5 | 2222 | (add-method! g-equal? (method (x y) #f)) |
9f63ce02 | 2223 | (set-primitive-generic! equal? g-equal?) |
a48d60b1 | 2224 | |
14f1d9fe MD |
2225 | ;;; |
2226 | ;;; methods to display/write an object | |
2227 | ;;; | |
2228 | ||
2229 | ; Code for writing objects must test that the slots they use are | |
8dfc0ba5 | 2230 | ; bound. Otherwise a slot-unbound method will be called and will |
14f1d9fe MD |
2231 | ; conduct to an infinite loop. |
2232 | ||
2233 | ;; Write | |
2234 | (define (display-address o file) | |
2235 | (display (number->string (object-address o) 16) file)) | |
2236 | ||
71d540f7 | 2237 | (define-method (write o file) |
14f1d9fe MD |
2238 | (display "#<instance " file) |
2239 | (display-address o file) | |
2240 | (display #\> file)) | |
2241 | ||
2242 | (define write-object (primitive-generic-generic write)) | |
2243 | ||
71d540f7 | 2244 | (define-method (write (o <object>) file) |
14f1d9fe MD |
2245 | (let ((class (class-of o))) |
2246 | (if (slot-bound? class 'name) | |
8dfc0ba5 AW |
2247 | (begin |
2248 | (display "#<" file) | |
2249 | (display (class-name class) file) | |
2250 | (display #\space file) | |
2251 | (display-address o file) | |
2252 | (display #\> file)) | |
2253 | (next-method)))) | |
14f1d9fe | 2254 | |
568174d1 AW |
2255 | (define-method (write (slot <slot>) file) |
2256 | (let ((class (class-of slot))) | |
2257 | (if (and (slot-bound? class 'name) | |
2258 | (slot-bound? slot 'name)) | |
2259 | (begin | |
2260 | (display "#<" file) | |
2261 | (display (class-name class) file) | |
2262 | (display #\space file) | |
2a3ef7c4 | 2263 | (display (%slot-definition-name slot) file) |
568174d1 AW |
2264 | (display #\space file) |
2265 | (display-address slot file) | |
2266 | (display #\> file)) | |
2267 | (next-method)))) | |
2268 | ||
71d540f7 | 2269 | (define-method (write (class <class>) file) |
14f1d9fe MD |
2270 | (let ((meta (class-of class))) |
2271 | (if (and (slot-bound? class 'name) | |
8dfc0ba5 AW |
2272 | (slot-bound? meta 'name)) |
2273 | (begin | |
2274 | (display "#<" file) | |
2275 | (display (class-name meta) file) | |
2276 | (display #\space file) | |
2277 | (display (class-name class) file) | |
2278 | (display #\space file) | |
2279 | (display-address class file) | |
2280 | (display #\> file)) | |
2281 | (next-method)))) | |
14f1d9fe | 2282 | |
71d540f7 | 2283 | (define-method (write (gf <generic>) file) |
14f1d9fe MD |
2284 | (let ((meta (class-of gf))) |
2285 | (if (and (slot-bound? meta 'name) | |
8dfc0ba5 AW |
2286 | (slot-bound? gf 'methods)) |
2287 | (begin | |
2288 | (display "#<" file) | |
2289 | (display (class-name meta) file) | |
2290 | (let ((name (generic-function-name gf))) | |
2291 | (if name | |
2292 | (begin | |
2293 | (display #\space file) | |
2294 | (display name file)))) | |
2295 | (display " (" file) | |
2296 | (display (length (generic-function-methods gf)) file) | |
2297 | (display ")>" file)) | |
2298 | (next-method)))) | |
14f1d9fe | 2299 | |
71d540f7 | 2300 | (define-method (write (o <method>) file) |
14f1d9fe MD |
2301 | (let ((meta (class-of o))) |
2302 | (if (and (slot-bound? meta 'name) | |
8dfc0ba5 AW |
2303 | (slot-bound? o 'specializers)) |
2304 | (begin | |
2305 | (display "#<" file) | |
2306 | (display (class-name meta) file) | |
2307 | (display #\space file) | |
2308 | (display (map* (lambda (spec) | |
2309 | (if (slot-bound? spec 'name) | |
2310 | (slot-ref spec 'name) | |
2311 | spec)) | |
2312 | (method-specializers o)) | |
2313 | file) | |
2314 | (display #\space file) | |
2315 | (display-address o file) | |
2316 | (display #\> file)) | |
2317 | (next-method)))) | |
14f1d9fe MD |
2318 | |
2319 | ;; Display (do the same thing as write by default) | |
8dfc0ba5 | 2320 | (define-method (display o file) |
14f1d9fe MD |
2321 | (write-object o file)) |
2322 | ||
7b07e5ef MD |
2323 | ;;; |
2324 | ;;; Handling of duplicate bindings in the module system | |
2325 | ;;; | |
2326 | ||
28d0871b AW |
2327 | (define (find-subclass super name) |
2328 | (let lp ((classes (class-direct-subclasses super))) | |
2329 | (cond | |
2330 | ((null? classes) | |
2331 | (error "class not found" name)) | |
2332 | ((and (slot-bound? (car classes) 'name) | |
2333 | (eq? (class-name (car classes)) name)) | |
2334 | (car classes)) | |
2335 | (else | |
2336 | (lp (cdr classes)))))) | |
2337 | ||
2338 | ;; A record type. | |
2339 | (define <module> (find-subclass <top> '<module>)) | |
2340 | ||
7b07e5ef | 2341 | (define-method (merge-generics (module <module>) |
8dfc0ba5 AW |
2342 | (name <symbol>) |
2343 | (int1 <module>) | |
2344 | (val1 <top>) | |
2345 | (int2 <module>) | |
2346 | (val2 <top>) | |
2347 | (var <top>) | |
2348 | (val <top>)) | |
7b07e5ef MD |
2349 | #f) |
2350 | ||
2351 | (define-method (merge-generics (module <module>) | |
8dfc0ba5 AW |
2352 | (name <symbol>) |
2353 | (int1 <module>) | |
2354 | (val1 <generic>) | |
2355 | (int2 <module>) | |
2356 | (val2 <generic>) | |
2357 | (var <top>) | |
2358 | (val <boolean>)) | |
c9fa1748 MD |
2359 | (and (not (eq? val1 val2)) |
2360 | (make-variable (make-extended-generic (list val2 val1) name)))) | |
7b07e5ef MD |
2361 | |
2362 | (define-method (merge-generics (module <module>) | |
8dfc0ba5 AW |
2363 | (name <symbol>) |
2364 | (int1 <module>) | |
2365 | (val1 <generic>) | |
2366 | (int2 <module>) | |
2367 | (val2 <generic>) | |
2368 | (var <top>) | |
2369 | (gf <extended-generic>)) | |
c9fa1748 MD |
2370 | (and (not (memq val2 (slot-ref gf 'extends))) |
2371 | (begin | |
8dfc0ba5 AW |
2372 | (slot-set! gf |
2373 | 'extends | |
2374 | (cons val2 (delq! val2 (slot-ref gf 'extends)))) | |
2375 | (slot-set! val2 | |
2376 | 'extended-by | |
2377 | (cons gf (delq! gf (slot-ref val2 'extended-by)))) | |
eddd81f4 | 2378 | (invalidate-method-cache! gf) |
8dfc0ba5 | 2379 | var))) |
7b07e5ef MD |
2380 | |
2381 | (module-define! duplicate-handlers 'merge-generics merge-generics) | |
2382 | ||
f8af5c6d | 2383 | (define-method (merge-accessors (module <module>) |
8dfc0ba5 AW |
2384 | (name <symbol>) |
2385 | (int1 <module>) | |
2386 | (val1 <top>) | |
2387 | (int2 <module>) | |
2388 | (val2 <top>) | |
2389 | (var <top>) | |
2390 | (val <top>)) | |
f8af5c6d MD |
2391 | #f) |
2392 | ||
2393 | (define-method (merge-accessors (module <module>) | |
8dfc0ba5 AW |
2394 | (name <symbol>) |
2395 | (int1 <module>) | |
2396 | (val1 <accessor>) | |
2397 | (int2 <module>) | |
2398 | (val2 <accessor>) | |
2399 | (var <top>) | |
2400 | (val <top>)) | |
f8af5c6d MD |
2401 | (merge-generics module name int1 val1 int2 val2 var val)) |
2402 | ||
2403 | (module-define! duplicate-handlers 'merge-accessors merge-accessors) | |
2404 | ||
14f1d9fe MD |
2405 | ;;; |
2406 | ;;; slot access | |
2407 | ;;; | |
2408 | ||
568174d1 AW |
2409 | (define (class-slot-ref class slot-name) |
2410 | (let ((slot (class-slot-definition class slot-name))) | |
2a3ef7c4 | 2411 | (unless (memq (%slot-definition-allocation slot) '(#:class #:each-subclass)) |
bacc8829 | 2412 | (slot-missing class slot-name)) |
2a3ef7c4 | 2413 | (let ((x ((%slot-definition-slot-ref slot) #f))) |
568174d1 AW |
2414 | (if (unbound? x) |
2415 | (slot-unbound class slot-name) | |
2416 | x)))) | |
2417 | ||
2418 | (define (class-slot-set! class slot-name value) | |
2419 | (let ((slot (class-slot-definition class slot-name))) | |
2a3ef7c4 | 2420 | (unless (memq (%slot-definition-allocation slot) '(#:class #:each-subclass)) |
568174d1 | 2421 | (slot-missing class slot-name)) |
2a3ef7c4 | 2422 | ((%slot-definition-slot-set! slot) #f value))) |
14f1d9fe | 2423 | |
71d540f7 | 2424 | (define-method (slot-unbound (c <class>) (o <object>) s) |
14f1d9fe MD |
2425 | (goops-error "Slot `~S' is unbound in object ~S" s o)) |
2426 | ||
71d540f7 | 2427 | (define-method (slot-unbound (c <class>) s) |
14f1d9fe MD |
2428 | (goops-error "Slot `~S' is unbound in class ~S" s c)) |
2429 | ||
71d540f7 | 2430 | (define-method (slot-unbound (o <object>)) |
14f1d9fe MD |
2431 | (goops-error "Unbound slot in object ~S" o)) |
2432 | ||
71d540f7 | 2433 | (define-method (slot-missing (c <class>) (o <object>) s) |
14f1d9fe | 2434 | (goops-error "No slot with name `~S' in object ~S" s o)) |
8dfc0ba5 | 2435 | |
71d540f7 | 2436 | (define-method (slot-missing (c <class>) s) |
14f1d9fe | 2437 | (goops-error "No class slot with name `~S' in class ~S" s c)) |
8dfc0ba5 | 2438 | |
14f1d9fe | 2439 | |
71d540f7 | 2440 | (define-method (slot-missing (c <class>) (o <object>) s value) |
14f1d9fe MD |
2441 | (slot-missing c o s)) |
2442 | ||
2443 | ;;; Methods for the possible error we can encounter when calling a gf | |
2444 | ||
71d540f7 | 2445 | (define-method (no-next-method (gf <generic>) args) |
14f1d9fe MD |
2446 | (goops-error "No next method when calling ~S\nwith arguments ~S" gf args)) |
2447 | ||
71d540f7 | 2448 | (define-method (no-applicable-method (gf <generic>) args) |
14f1d9fe | 2449 | (goops-error "No applicable method for ~S in call ~S" |
8dfc0ba5 | 2450 | gf (cons (generic-function-name gf) args))) |
14f1d9fe | 2451 | |
71d540f7 | 2452 | (define-method (no-method (gf <generic>) args) |
14f1d9fe MD |
2453 | (goops-error "No method defined for ~S" gf)) |
2454 | ||
2455 | ;;; | |
2456 | ;;; {Cloning functions (from rdeline@CS.CMU.EDU)} | |
2457 | ;;; | |
2458 | ||
71d540f7 | 2459 | (define-method (shallow-clone (self <object>)) |
07452c83 AW |
2460 | (let* ((class (class-of self)) |
2461 | (clone (%allocate-instance class)) | |
2462 | (slots (map slot-definition-name (class-slots class)))) | |
14f1d9fe | 2463 | (for-each (lambda (slot) |
bacc8829 AW |
2464 | (when (slot-bound? self slot) |
2465 | (slot-set! clone slot (slot-ref self slot)))) | |
8dfc0ba5 | 2466 | slots) |
14f1d9fe MD |
2467 | clone)) |
2468 | ||
71d540f7 | 2469 | (define-method (deep-clone (self <object>)) |
07452c83 AW |
2470 | (let* ((class (class-of self)) |
2471 | (clone (%allocate-instance class)) | |
2472 | (slots (map slot-definition-name (class-slots class)))) | |
14f1d9fe | 2473 | (for-each (lambda (slot) |
bacc8829 AW |
2474 | (when (slot-bound? self slot) |
2475 | (slot-set! clone slot | |
2476 | (let ((value (slot-ref self slot))) | |
2477 | (if (instance? value) | |
2478 | (deep-clone value) | |
2479 | value))))) | |
8dfc0ba5 | 2480 | slots) |
14f1d9fe MD |
2481 | clone)) |
2482 | ||
2483 | ;;; | |
2484 | ;;; {Class redefinition utilities} | |
2485 | ;;; | |
2486 | ||
2487 | ;;; (class-redefinition OLD NEW) | |
2488 | ;;; | |
2489 | ||
2490 | ;;; Has correct the following conditions: | |
2491 | ||
2492 | ;;; Methods | |
8dfc0ba5 | 2493 | ;;; |
14f1d9fe | 2494 | ;;; 1. New accessor specializers refer to new header |
8dfc0ba5 | 2495 | ;;; |
14f1d9fe | 2496 | ;;; Classes |
8dfc0ba5 | 2497 | ;;; |
14f1d9fe MD |
2498 | ;;; 1. New class cpl refers to the new class header |
2499 | ;;; 2. Old class header exists on old super classes direct-subclass lists | |
2500 | ;;; 3. New class header exists on new super classes direct-subclass lists | |
2501 | ||
71d540f7 | 2502 | (define-method (class-redefinition (old <class>) (new <class>)) |
14f1d9fe | 2503 | ;; Work on direct methods: |
8dfc0ba5 AW |
2504 | ;; 1. Remove accessor methods from the old class |
2505 | ;; 2. Patch the occurences of new in the specializers by old | |
2506 | ;; 3. Displace the methods from old to new | |
2507 | (remove-class-accessors! old) ;; -1- | |
14f1d9fe MD |
2508 | (let ((methods (class-direct-methods new))) |
2509 | (for-each (lambda (m) | |
8dfc0ba5 | 2510 | (update-direct-method! m new old)) ;; -2- |
14f1d9fe | 2511 | methods) |
8dfc0ba5 AW |
2512 | (struct-set! new |
2513 | class-index-direct-methods | |
2514 | (append methods (class-direct-methods old)))) | |
14f1d9fe MD |
2515 | |
2516 | ;; Substitute old for new in new cpl | |
8dfc0ba5 AW |
2517 | (set-car! (struct-ref new class-index-cpl) old) |
2518 | ||
14f1d9fe | 2519 | ;; Remove the old class from the direct-subclasses list of its super classes |
8dfc0ba5 AW |
2520 | (for-each (lambda (c) (struct-set! c class-index-direct-subclasses |
2521 | (delv! old (class-direct-subclasses c)))) | |
2522 | (class-direct-supers old)) | |
14f1d9fe MD |
2523 | |
2524 | ;; Replace the new class with the old in the direct-subclasses of the supers | |
2525 | (for-each (lambda (c) | |
8dfc0ba5 AW |
2526 | (struct-set! c class-index-direct-subclasses |
2527 | (cons old (delv! new (class-direct-subclasses c))))) | |
2528 | (class-direct-supers new)) | |
14f1d9fe MD |
2529 | |
2530 | ;; Swap object headers | |
2531 | (%modify-class old new) | |
2532 | ||
2533 | ;; Now old is NEW! | |
2534 | ||
2535 | ;; Redefine all the subclasses of old to take into account modification | |
8dfc0ba5 AW |
2536 | (for-each |
2537 | (lambda (c) | |
2538 | (update-direct-subclass! c new old)) | |
2539 | (class-direct-subclasses new)) | |
14f1d9fe MD |
2540 | |
2541 | ;; Invalidate class so that subsequent instances slot accesses invoke | |
2542 | ;; change-object-class | |
8dfc0ba5 | 2543 | (struct-set! new class-index-redefined old) |
761338f6 | 2544 | (class-clear-flags! new vtable-flag-goops-valid) ;must come after slot-set! |
14f1d9fe MD |
2545 | |
2546 | old) | |
2547 | ||
2548 | ;;; | |
2549 | ;;; remove-class-accessors! | |
2550 | ;;; | |
2551 | ||
71d540f7 | 2552 | (define-method (remove-class-accessors! (c <class>)) |
14f1d9fe | 2553 | (for-each (lambda (m) |
bacc8829 AW |
2554 | (when (is-a? m <accessor-method>) |
2555 | (let ((gf (slot-ref m 'generic-function))) | |
2556 | ;; remove the method from its GF | |
2557 | (slot-set! gf 'methods | |
2558 | (delq1! m (slot-ref gf 'methods))) | |
2559 | (invalidate-method-cache! gf) | |
2560 | ;; remove the method from its specializers | |
2561 | (remove-method-in-classes! m)))) | |
8dfc0ba5 | 2562 | (class-direct-methods c))) |
14f1d9fe MD |
2563 | |
2564 | ;;; | |
2565 | ;;; update-direct-method! | |
2566 | ;;; | |
2567 | ||
71d540f7 | 2568 | (define-method (update-direct-method! (m <method>) |
8dfc0ba5 AW |
2569 | (old <class>) |
2570 | (new <class>)) | |
14f1d9fe | 2571 | (let loop ((l (method-specializers m))) |
8dfc0ba5 | 2572 | ;; Note: the <top> in dotted list is never used. |
14f1d9fe | 2573 | ;; So we can work as if we had only proper lists. |
bacc8829 AW |
2574 | (when (pair? l) |
2575 | (when (eqv? (car l) old) | |
2576 | (set-car! l new)) | |
2577 | (loop (cdr l))))) | |
14f1d9fe MD |
2578 | |
2579 | ;;; | |
2580 | ;;; update-direct-subclass! | |
2581 | ;;; | |
2582 | ||
71d540f7 | 2583 | (define-method (update-direct-subclass! (c <class>) |
8dfc0ba5 AW |
2584 | (old <class>) |
2585 | (new <class>)) | |
14f1d9fe | 2586 | (class-redefinition c |
8dfc0ba5 AW |
2587 | (make-class (class-direct-supers c) |
2588 | (class-direct-slots c) | |
2589 | #:name (class-name c) | |
2590 | #:metaclass (class-of c)))) | |
14f1d9fe MD |
2591 | |
2592 | ;;; | |
2593 | ;;; {Utilities for INITIALIZE methods} | |
2594 | ;;; | |
2595 | ||
2596 | ;;; compute-slot-accessors | |
2597 | ;;; | |
9d019f9b | 2598 | (define (compute-slot-accessors class slots) |
14f1d9fe | 2599 | (for-each |
568174d1 | 2600 | (lambda (slot) |
2a3ef7c4 AW |
2601 | (let ((getter (%slot-definition-getter slot)) |
2602 | (setter (%slot-definition-setter slot)) | |
568174d1 | 2603 | (accessor-setter setter) |
2a3ef7c4 | 2604 | (accessor (%slot-definition-accessor slot))) |
568174d1 AW |
2605 | (when getter |
2606 | (add-method! getter (compute-getter-method class slot))) | |
2607 | (when setter | |
2608 | (add-method! setter (compute-setter-method class slot))) | |
2609 | (when accessor | |
2610 | (add-method! accessor (compute-getter-method class slot)) | |
2611 | (add-method! (accessor-setter accessor) | |
2612 | (compute-setter-method class slot))))) | |
2613 | slots)) | |
2614 | ||
2615 | (define-method (compute-getter-method (class <class>) slot) | |
2616 | (let ((init-thunk (slot-definition-init-thunk slot)) | |
2617 | (slot-ref (slot-definition-slot-ref slot)) | |
2618 | (index (slot-definition-index slot))) | |
14f1d9fe MD |
2619 | (make <accessor-method> |
2620 | #:specializers (list class) | |
568174d1 AW |
2621 | #:procedure (cond |
2622 | (slot-ref (make-generic-bound-check-getter slot-ref)) | |
2623 | (init-thunk (standard-get index)) | |
2624 | (else (bound-check-get index))) | |
2625 | #:slot-definition slot))) | |
2626 | ||
2627 | (define-method (compute-setter-method (class <class>) slot) | |
2628 | (let ((slot-set! (slot-definition-slot-set! slot)) | |
2629 | (index (slot-definition-index slot))) | |
14f1d9fe | 2630 | (make <accessor-method> |
568174d1 AW |
2631 | #:specializers (list class <top>) |
2632 | #:procedure (cond | |
2633 | (slot-set! slot-set!) | |
2634 | (else (standard-set index))) | |
2635 | #:slot-definition slot))) | |
14f1d9fe MD |
2636 | |
2637 | (define (make-generic-bound-check-getter proc) | |
984d43b6 AW |
2638 | (lambda (o) |
2639 | (let ((val (proc o))) | |
2640 | (if (unbound? val) | |
2641 | (slot-unbound o) | |
2642 | val)))) | |
14f1d9fe | 2643 | |
4d6a7ac6 AW |
2644 | ;;; Pre-generate getters and setters for the first 20 slots. |
2645 | (define-syntax define-standard-accessor-method | |
2646 | (lambda (stx) | |
2647 | (define num-standard-pre-cache 20) | |
2648 | (syntax-case stx () | |
2649 | ((_ ((proc n) arg ...) body) | |
2650 | #`(define proc | |
2651 | (let ((cache (vector #,@(map (lambda (n*) | |
2652 | #`(lambda (arg ...) | |
2653 | (let ((n #,n*)) | |
2654 | body))) | |
2655 | (iota num-standard-pre-cache))))) | |
2656 | (lambda (n) | |
2657 | (if (< n #,num-standard-pre-cache) | |
2658 | (vector-ref cache n) | |
2659 | (lambda (arg ...) body))))))))) | |
abd6af11 AW |
2660 | |
2661 | (define-standard-accessor-method ((bound-check-get n) o) | |
4d6a7ac6 | 2662 | (let ((x (struct-ref o n))) |
abd6af11 | 2663 | (if (unbound? x) |
84012ef4 | 2664 | (slot-unbound o) |
abd6af11 AW |
2665 | x))) |
2666 | ||
2667 | (define-standard-accessor-method ((standard-get n) o) | |
4d6a7ac6 | 2668 | (struct-ref o n)) |
abd6af11 AW |
2669 | |
2670 | (define-standard-accessor-method ((standard-set n) o v) | |
4d6a7ac6 | 2671 | (struct-set! o n v)) |
14f1d9fe | 2672 | |
14f1d9fe MD |
2673 | ;;; compute-cpl |
2674 | ;;; | |
9167e0b8 AW |
2675 | |
2676 | ;; Replace the bootstrap compute-cpl with this definition. | |
2677 | (define compute-cpl | |
2678 | (make <generic> #:name 'compute-cpl)) | |
14f1d9fe | 2679 | |
71d540f7 | 2680 | (define-method (compute-cpl (class <class>)) |
14f1d9fe MD |
2681 | (compute-std-cpl class class-direct-supers)) |
2682 | ||
14f1d9fe MD |
2683 | ;;; compute-get-n-set |
2684 | ;;; | |
568174d1 AW |
2685 | (define compute-get-n-set |
2686 | (make <generic> #:name 'compute-get-n-set)) | |
2687 | ||
71d540f7 | 2688 | (define-method (compute-get-n-set (class <class>) s) |
5b763233 AW |
2689 | (define (class-slot-init-value) |
2690 | (let ((thunk (slot-definition-init-thunk s))) | |
2691 | (if thunk | |
2692 | (thunk) | |
2693 | (slot-definition-init-value s)))) | |
2694 | ||
568174d1 AW |
2695 | (define (make-closure-variable class value) |
2696 | (list (lambda (o) value) | |
2697 | (lambda (o v) (set! value v)))) | |
2698 | ||
14f1d9fe MD |
2699 | (case (slot-definition-allocation s) |
2700 | ((#:instance) ;; Instance slot | |
2701 | ;; get-n-set is just its offset | |
8dfc0ba5 AW |
2702 | (let ((already-allocated (struct-ref class class-index-nfields))) |
2703 | (struct-set! class class-index-nfields (+ already-allocated 1)) | |
14f1d9fe MD |
2704 | already-allocated)) |
2705 | ||
568174d1 | 2706 | ((#:class) ;; Class slot |
8dfc0ba5 | 2707 | ;; Class-slots accessors are implemented as 2 closures around |
14f1d9fe MD |
2708 | ;; a Scheme variable. As instance slots, class slots must be |
2709 | ;; unbound at init time. | |
2710 | (let ((name (slot-definition-name s))) | |
2711 | (if (memq name (map slot-definition-name (class-direct-slots class))) | |
8dfc0ba5 AW |
2712 | ;; This slot is direct; create a new shared variable |
2713 | (make-closure-variable class (class-slot-init-value)) | |
2714 | ;; Slot is inherited. Find its definition in superclass | |
568174d1 AW |
2715 | (let lp ((cpl (cdr (class-precedence-list class)))) |
2716 | (match cpl | |
2717 | ((super . cpl) | |
2718 | (let ((s (class-slot-definition super name))) | |
2719 | (if s | |
2720 | (list (slot-definition-slot-ref s) | |
2721 | (slot-definition-slot-set! s)) | |
2722 | ;; Multiple inheritance means that we might have | |
2723 | ;; to look deeper in the CPL. | |
2724 | (lp cpl))))))))) | |
14f1d9fe MD |
2725 | |
2726 | ((#:each-subclass) ;; slot shared by instances of direct subclass. | |
2727 | ;; (Thomas Buerger, April 1998) | |
5b763233 | 2728 | (make-closure-variable class (class-slot-init-value))) |
14f1d9fe MD |
2729 | |
2730 | ((#:virtual) ;; No allocation | |
2731 | ;; slot-ref and slot-set! function must be given by the user | |
2732 | (let ((get (get-keyword #:slot-ref (slot-definition-options s) #f)) | |
8dfc0ba5 | 2733 | (set (get-keyword #:slot-set! (slot-definition-options s) #f))) |
bacc8829 AW |
2734 | (unless (and get set) |
2735 | (goops-error "You must supply a #:slot-ref and a #:slot-set! in ~S" s)) | |
14f1d9fe MD |
2736 | (list get set))) |
2737 | (else (next-method)))) | |
2738 | ||
71d540f7 | 2739 | (define-method (compute-get-n-set (o <object>) s) |
14f1d9fe MD |
2740 | (goops-error "Allocation \"~S\" is unknown" (slot-definition-allocation s))) |
2741 | ||
71d540f7 | 2742 | (define-method (compute-slots (class <class>)) |
51fd1cd6 AW |
2743 | (build-slots-list (class-direct-slots class) |
2744 | (class-precedence-list class))) | |
14f1d9fe MD |
2745 | |
2746 | ;;; | |
2747 | ;;; {Initialize} | |
2748 | ;;; | |
2749 | ||
4a28ef10 AW |
2750 | ;; FIXME: This could be much more efficient. |
2751 | (define (%initialize-object obj initargs) | |
2752 | "Initialize the object @var{obj} with the given arguments | |
2753 | var{initargs}." | |
79c2ca26 AW |
2754 | (define (valid-initargs? initargs) |
2755 | (match initargs | |
2756 | (() #t) | |
2757 | (((? keyword?) _ . initargs) (valid-initargs? initargs)) | |
2758 | (_ #f))) | |
4a28ef10 AW |
2759 | (unless (instance? obj) |
2760 | (scm-error 'wrong-type-arg #f "Not an object: ~S" | |
2761 | (list obj) #f)) | |
79c2ca26 AW |
2762 | (unless (valid-initargs? initargs) |
2763 | (scm-error 'wrong-type-arg #f "Invalid initargs: ~S" | |
4a28ef10 AW |
2764 | (list initargs) #f)) |
2765 | (let ((class (class-of obj))) | |
2766 | (define (get-initarg kw) | |
2767 | (if kw | |
79c2ca26 AW |
2768 | ;; Inlined get-keyword to avoid checking initargs for validity |
2769 | ;; each time. | |
2770 | (let lp ((initargs initargs)) | |
2771 | (match initargs | |
2772 | ((kw* val . initargs) | |
2773 | (if (eq? kw* kw) | |
2774 | val | |
2775 | (lp initargs))) | |
2776 | (_ *unbound*))) | |
4a28ef10 | 2777 | *unbound*)) |
568174d1 | 2778 | (let lp ((slots (struct-ref class class-index-slots))) |
4a28ef10 AW |
2779 | (match slots |
2780 | (() obj) | |
568174d1 | 2781 | ((slot . slots) |
79c2ca26 AW |
2782 | (define (initialize-slot! value) |
2783 | (cond | |
2784 | ((%slot-definition-slot-set! slot) | |
2785 | => (lambda (slot-set!) (slot-set! obj value))) | |
2786 | (else | |
2787 | (struct-set! obj (%slot-definition-index slot) value)))) | |
2a3ef7c4 | 2788 | (let ((initarg (get-initarg (%slot-definition-init-keyword slot)))) |
568174d1 AW |
2789 | (cond |
2790 | ((not (unbound? initarg)) | |
79c2ca26 | 2791 | (initialize-slot! initarg)) |
2a3ef7c4 | 2792 | ((%slot-definition-init-thunk slot) |
568174d1 AW |
2793 | => (lambda (init-thunk) |
2794 | (unless (memq (slot-definition-allocation slot) | |
2795 | '(#:class #:each-subclass)) | |
79c2ca26 | 2796 | (initialize-slot! (init-thunk))))))) |
568174d1 | 2797 | (lp slots)))))) |
4a28ef10 | 2798 | |
71d540f7 | 2799 | (define-method (initialize (object <object>) initargs) |
14f1d9fe MD |
2800 | (%initialize-object object initargs)) |
2801 | ||
568174d1 AW |
2802 | (define-method (initialize (slot <slot>) initargs) |
2803 | (next-method) | |
2804 | (struct-set! slot slot-index-options initargs) | |
2a3ef7c4 | 2805 | (let ((init-thunk (%slot-definition-init-thunk slot))) |
568174d1 AW |
2806 | (when init-thunk |
2807 | (unless (thunk? init-thunk) | |
2808 | (goops-error "Bad init-thunk for slot `~S': ~S" | |
2a3ef7c4 | 2809 | (%slot-definition-name slot) init-thunk))))) |
568174d1 | 2810 | |
71d540f7 | 2811 | (define-method (initialize (class <class>) initargs) |
568174d1 AW |
2812 | (define (make-direct-slot-definition dslot) |
2813 | (let ((initargs (compute-direct-slot-definition-initargs class dslot))) | |
2814 | (compute-direct-slot-definition class initargs))) | |
2815 | ||
14f1d9fe | 2816 | (next-method) |
568174d1 AW |
2817 | (class-add-flags! class (logior vtable-flag-goops-class |
2818 | vtable-flag-goops-valid)) | |
2819 | (struct-set! class class-index-name (get-keyword #:name initargs '???)) | |
2820 | (struct-set! class class-index-nfields 0) | |
2821 | (struct-set! class class-index-direct-supers | |
2822 | (get-keyword #:dsupers initargs '())) | |
2823 | (struct-set! class class-index-direct-subclasses '()) | |
2824 | (struct-set! class class-index-direct-methods '()) | |
2825 | (struct-set! class class-index-redefined #f) | |
2826 | (struct-set! class class-index-cpl (compute-cpl class)) | |
2827 | (struct-set! class class-index-direct-slots | |
2828 | (map (lambda (slot) | |
2829 | (if (slot? slot) | |
2830 | slot | |
2831 | (make-direct-slot-definition slot))) | |
2832 | (get-keyword #:slots initargs '()))) | |
2833 | (struct-set! class class-index-slots | |
2834 | (allocate-slots class (compute-slots class))) | |
2835 | ||
e437c50b AW |
2836 | ;; This is a hack. |
2837 | (when (memq <slot> (struct-ref class class-index-cpl)) | |
2838 | (class-add-flags! class vtable-flag-goops-slot)) | |
2839 | ||
568174d1 AW |
2840 | ;; Build getters - setters - accessors |
2841 | (compute-slot-accessors class (struct-ref class class-index-slots)) | |
2842 | ||
2843 | ;; Update the "direct-subclasses" of each inherited classes | |
2844 | (for-each (lambda (x) | |
2845 | (let ((dsubs (struct-ref x class-index-direct-subclasses))) | |
2846 | (struct-set! x class-index-direct-subclasses | |
2847 | (cons class dsubs)))) | |
2848 | (struct-ref class class-index-direct-supers)) | |
2849 | ||
2850 | ;; Compute struct layout of instances, set the `layout' slot, and | |
2851 | ;; update class flags. | |
2852 | (%prep-layout! class)) | |
14f1d9fe | 2853 | |
14f1d9fe MD |
2854 | (define (initialize-object-procedure object initargs) |
2855 | (let ((proc (get-keyword #:procedure initargs #f))) | |
2856 | (cond ((not proc)) | |
8dfc0ba5 AW |
2857 | ((pair? proc) |
2858 | (apply slot-set! object 'procedure proc)) | |
2859 | (else | |
962b9103 | 2860 | (slot-set! object 'procedure proc))))) |
14f1d9fe | 2861 | |
51f66c91 | 2862 | (define-method (initialize (applicable-struct <applicable-struct>) initargs) |
14f1d9fe | 2863 | (next-method) |
51f66c91 | 2864 | (initialize-object-procedure applicable-struct initargs)) |
14f1d9fe | 2865 | |
6c7dd9eb AW |
2866 | (define-method (initialize (applicable-struct <applicable-struct-with-setter>) |
2867 | initargs) | |
2868 | (next-method) | |
2869 | (slot-set! applicable-struct 'setter (get-keyword #:setter initargs #f))) | |
2870 | ||
71d540f7 | 2871 | (define-method (initialize (generic <generic>) initargs) |
14f1d9fe | 2872 | (let ((previous-definition (get-keyword #:default initargs #f)) |
8dfc0ba5 | 2873 | (name (get-keyword #:name initargs #f))) |
14f1d9fe MD |
2874 | (next-method) |
2875 | (slot-set! generic 'methods (if (is-a? previous-definition <procedure>) | |
8dfc0ba5 | 2876 | (list (method args |
7d38f3d8 | 2877 | (apply previous-definition args))) |
8dfc0ba5 | 2878 | '())) |
14f1d9fe | 2879 | (if name |
8dfc0ba5 | 2880 | (set-procedure-property! generic 'name name)) |
e0590e7c | 2881 | (invalidate-method-cache! generic))) |
14f1d9fe | 2882 | |
bbf8d523 MD |
2883 | (define-method (initialize (eg <extended-generic>) initargs) |
2884 | (next-method) | |
2885 | (slot-set! eg 'extends (get-keyword #:extends initargs '()))) | |
2886 | ||
b432fb4b MD |
2887 | (define dummy-procedure (lambda args *unspecified*)) |
2888 | ||
71d540f7 | 2889 | (define-method (initialize (method <method>) initargs) |
14f1d9fe MD |
2890 | (next-method) |
2891 | (slot-set! method 'generic-function (get-keyword #:generic-function initargs #f)) | |
2892 | (slot-set! method 'specializers (get-keyword #:specializers initargs '())) | |
b432fb4b | 2893 | (slot-set! method 'procedure |
8dfc0ba5 | 2894 | (get-keyword #:procedure initargs #f)) |
21497600 AW |
2895 | (slot-set! method 'formals (get-keyword #:formals initargs '())) |
2896 | (slot-set! method 'body (get-keyword #:body initargs '())) | |
e177058b | 2897 | (slot-set! method 'make-procedure (get-keyword #:make-procedure initargs #f))) |
8dfc0ba5 | 2898 | |
14f1d9fe | 2899 | |
14f1d9fe MD |
2900 | ;;; |
2901 | ;;; {Change-class} | |
2902 | ;;; | |
2903 | ||
2904 | (define (change-object-class old-instance old-class new-class) | |
cc6c7fee | 2905 | (let ((new-instance (allocate-instance new-class '()))) |
8378b269 | 2906 | ;; Initialize the slots of the new instance |
9539b20b AW |
2907 | (for-each |
2908 | (lambda (slot) | |
2909 | (if (and (slot-exists? old-instance slot) | |
2a3ef7c4 | 2910 | (eq? (%slot-definition-allocation |
9539b20b AW |
2911 | (class-slot-definition old-class slot)) |
2912 | #:instance) | |
2913 | (slot-bound? old-instance slot)) | |
2914 | ;; Slot was present and allocated in old instance; copy it | |
2915 | (slot-set! new-instance slot (slot-ref old-instance slot)) | |
2916 | ;; slot was absent; initialize it with its default value | |
2917 | (let ((init (slot-init-function new-class slot))) | |
2918 | (when init | |
2919 | (slot-set! new-instance slot (init)))))) | |
2920 | (map slot-definition-name (class-slots new-class))) | |
14f1d9fe MD |
2921 | ;; Exchange old and new instance in place to keep pointers valid |
2922 | (%modify-instance old-instance new-instance) | |
2923 | ;; Allow class specific updates of instances (which now are swapped) | |
2924 | (update-instance-for-different-class new-instance old-instance) | |
2925 | old-instance)) | |
2926 | ||
2927 | ||
71d540f7 | 2928 | (define-method (update-instance-for-different-class (old-instance <object>) |
8dfc0ba5 AW |
2929 | (new-instance |
2930 | <object>)) | |
14f1d9fe MD |
2931 | ;;not really important what we do, we just need a default method |
2932 | new-instance) | |
2933 | ||
71d540f7 | 2934 | (define-method (change-class (old-instance <object>) (new-class <class>)) |
14f1d9fe MD |
2935 | (change-object-class old-instance (class-of old-instance) new-class)) |
2936 | ||
2937 | ;;; | |
2938 | ;;; {make} | |
2939 | ;;; | |
2940 | ;;; A new definition which overwrites the previous one which was built-in | |
2941 | ;;; | |
2942 | ||
71d540f7 | 2943 | (define-method (allocate-instance (class <class>) initargs) |
07452c83 | 2944 | (%allocate-instance class)) |
14f1d9fe | 2945 | |
71d540f7 | 2946 | (define-method (make-instance (class <class>) . initargs) |
14f1d9fe MD |
2947 | (let ((instance (allocate-instance class initargs))) |
2948 | (initialize instance initargs) | |
2949 | instance)) | |
2950 | ||
2951 | (define make make-instance) | |
2952 | ||
2953 | ;;; | |
2954 | ;;; {apply-generic} | |
2955 | ;;; | |
c2aa5d9b AW |
2956 | ;;; Protocol for calling generic functions, intended to be used when |
2957 | ;;; applying subclasses of <generic> and <generic-with-setter>. The | |
2958 | ;;; code below is similar to the first MOP described in AMOP. | |
2959 | ;;; | |
2960 | ;;; Note that standard generic functions dispatch only on the classes of | |
2961 | ;;; the arguments, and the result of such dispatch can be memoized. The | |
0d96acac AW |
2962 | ;;; `dispatch-generic-function-application-from-cache' routine |
2963 | ;;; implements this. `apply-generic' isn't called currently; the | |
2964 | ;;; generic function MOP was never fully implemented in GOOPS. However | |
2965 | ;;; now that GOOPS is implemented entirely in Scheme (2015) it's much | |
2966 | ;;; easier to complete this work. Contributions gladly accepted! | |
2967 | ;;; Please read the AMOP first though :) | |
c2aa5d9b AW |
2968 | ;;; |
2969 | ;;; The protocol is: | |
2970 | ;;; | |
2971 | ;;; + apply-generic (gf args) | |
2972 | ;;; + compute-applicable-methods (gf args ...) | |
2973 | ;;; + sort-applicable-methods (gf methods args) | |
2974 | ;;; + apply-methods (gf methods args) | |
2975 | ;;; | |
2976 | ;;; apply-methods calls make-next-method to build the "continuation" of | |
2977 | ;;; a method. Applying a next-method will call apply-next-method which | |
2978 | ;;; in turn will call apply again to call effectively the following | |
2979 | ;;; method. (This paragraph is out of date but is kept so that maybe it | |
2980 | ;;; illuminates some future hack.) | |
14f1d9fe MD |
2981 | ;;; |
2982 | ||
71d540f7 | 2983 | (define-method (apply-generic (gf <generic>) args) |
bacc8829 AW |
2984 | (when (null? (slot-ref gf 'methods)) |
2985 | (no-method gf args)) | |
14f1d9fe MD |
2986 | (let ((methods (compute-applicable-methods gf args))) |
2987 | (if methods | |
8dfc0ba5 AW |
2988 | (apply-methods gf (sort-applicable-methods gf methods args) args) |
2989 | (no-applicable-method gf args)))) | |
14f1d9fe MD |
2990 | |
2991 | ;; compute-applicable-methods is bound to %compute-applicable-methods. | |
2992 | ;; *fixme* use let | |
2993 | (define %%compute-applicable-methods | |
2994 | (make <generic> #:name 'compute-applicable-methods)) | |
2995 | ||
71d540f7 | 2996 | (define-method (%%compute-applicable-methods (gf <generic>) args) |
14f1d9fe MD |
2997 | (%compute-applicable-methods gf args)) |
2998 | ||
2999 | (set! compute-applicable-methods %%compute-applicable-methods) | |
3000 | ||
71d540f7 | 3001 | (define-method (sort-applicable-methods (gf <generic>) methods args) |
c0a56ec7 | 3002 | (%sort-applicable-methods methods (map class-of args))) |
14f1d9fe | 3003 | |
71d540f7 | 3004 | (define-method (method-more-specific? (m1 <method>) (m2 <method>) targs) |
14f1d9fe MD |
3005 | (%method-more-specific? m1 m2 targs)) |
3006 | ||
71d540f7 | 3007 | (define-method (apply-method (gf <generic>) methods build-next args) |
14f1d9fe | 3008 | (apply (method-procedure (car methods)) |
8dfc0ba5 AW |
3009 | (build-next (cdr methods) args) |
3010 | args)) | |
14f1d9fe | 3011 | |
71d540f7 | 3012 | (define-method (apply-methods (gf <generic>) (l <list>) args) |
14f1d9fe | 3013 | (letrec ((next (lambda (procs args) |
8dfc0ba5 AW |
3014 | (lambda new-args |
3015 | (let ((a (if (null? new-args) args new-args))) | |
3016 | (if (null? procs) | |
3017 | (no-next-method gf a) | |
3018 | (apply-method gf procs next a))))))) | |
14f1d9fe MD |
3019 | (apply-method gf l next args))) |
3020 | ||
3021 | ;; We don't want the following procedure to turn up in backtraces: | |
3022 | (for-each (lambda (proc) | |
8dfc0ba5 AW |
3023 | (set-procedure-property! proc 'system-procedure #t)) |
3024 | (list slot-unbound | |
3025 | slot-missing | |
3026 | no-next-method | |
3027 | no-applicable-method | |
3028 | no-method | |
3029 | )) | |
14f1d9fe | 3030 | |
14f1d9fe MD |
3031 | ;;; |
3032 | ;;; {Final initialization} | |
3033 | ;;; | |
3034 | ||
3035 | ;; Tell C code that the main bulk of Goops has been loaded | |
3036 | (%goops-loaded) | |
28d0871b AW |
3037 | |
3038 | ||
3039 | \f | |
3040 | ||
3041 | ;;; | |
3042 | ;;; {SMOB and port classes} | |
3043 | ;;; | |
3044 | ||
3045 | (define <arbiter> (find-subclass <top> '<arbiter>)) | |
3046 | (define <promise> (find-subclass <top> '<promise>)) | |
3047 | (define <thread> (find-subclass <top> '<thread>)) | |
3048 | (define <mutex> (find-subclass <top> '<mutex>)) | |
3049 | (define <condition-variable> (find-subclass <top> '<condition-variable>)) | |
3050 | (define <regexp> (find-subclass <top> '<regexp>)) | |
3051 | (define <hook> (find-subclass <top> '<hook>)) | |
3052 | (define <bitvector> (find-subclass <top> '<bitvector>)) | |
3053 | (define <random-state> (find-subclass <top> '<random-state>)) | |
3054 | (define <async> (find-subclass <top> '<async>)) | |
3055 | (define <directory> (find-subclass <top> '<directory>)) | |
28d0871b AW |
3056 | (define <array> (find-subclass <top> '<array>)) |
3057 | (define <character-set> (find-subclass <top> '<character-set>)) | |
3058 | (define <dynamic-object> (find-subclass <top> '<dynamic-object>)) | |
3059 | (define <guardian> (find-subclass <applicable> '<guardian>)) | |
02620dd9 | 3060 | (define <macro> (find-subclass <top> '<macro>)) |
28d0871b AW |
3061 | |
3062 | (define (define-class-subtree class) | |
3063 | (define! (class-name class) class) | |
3064 | (for-each define-class-subtree (class-direct-subclasses class))) | |
3065 | ||
3066 | (define-class-subtree (find-subclass <port> '<file-port>)) |