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1 | ;;; -*-lisp-*- |
2 | ;;; | |
3 | ;;; Class layout protocol implementation | |
4 | ;;; | |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
10 | ;;; This file is part of the Sensble Object Design, an object system for C. | |
11 | ;;; | |
12 | ;;; SOD is free software; you can redistribute it and/or modify | |
13 | ;;; it under the terms of the GNU General Public License as published by | |
14 | ;;; the Free Software Foundation; either version 2 of the License, or | |
15 | ;;; (at your option) any later version. | |
16 | ;;; | |
17 | ;;; SOD is distributed in the hope that it will be useful, | |
18 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;;; GNU General Public License for more details. | |
21 | ;;; | |
22 | ;;; You should have received a copy of the GNU General Public License | |
23 | ;;; along with SOD; if not, write to the Free Software Foundation, | |
24 | ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | ||
26 | (cl:in-package #:sod) | |
27 | ||
28 | ;;;-------------------------------------------------------------------------- | |
29 | ;;; Effective slots. | |
30 | ||
31 | (defmethod print-object ((slot effective-slot) stream) | |
32 | (maybe-print-unreadable-object (slot stream :type t) | |
33 | (format stream "~A~@[ = ~@_~A~]" | |
34 | (effective-slot-direct-slot slot) | |
35 | (effective-slot-initializer slot)))) | |
36 | ||
37 | (defmethod find-slot-initializer ((class sod-class) (slot sod-slot)) | |
38 | (some (lambda (super) | |
39 | (find slot | |
40 | (sod-class-instance-initializers super) | |
41 | :key #'sod-initializer-slot)) | |
42 | (sod-class-precedence-list class))) | |
43 | ||
44 | (defmethod compute-effective-slot ((class sod-class) (slot sod-slot)) | |
45 | (make-instance 'effective-slot | |
46 | :slot slot | |
47 | :class class | |
48 | :initializer (find-slot-initializer class slot))) | |
49 | ||
50 | ;;;-------------------------------------------------------------------------- | |
51 | ;;; Special-purpose slot objects. | |
52 | ||
53 | (export 'sod-class-slot) | |
54 | (defclass sod-class-slot (sod-slot) | |
55 | ((initializer-function :initarg :initializer-function | |
56 | :type (or symbol function) | |
57 | :reader sod-slot-initializer-function) | |
58 | (prepare-function :initarg :prepare-function :type (or symbol function) | |
59 | :reader sod-slot-prepare-function)) | |
60 | (:documentation | |
61 | "Special class for slots defined on SodClass. | |
62 | ||
63 | These slots need class-specific initialization. It's easier to keep all | |
64 | of the information (name, type, and how to initialize them) about these | |
65 | slots in one place, so that's what we do here.")) | |
66 | ||
67 | (defmethod shared-initialize :after | |
68 | ((slot sod-class-slot) slot-names &key pset) | |
69 | (declare (ignore slot-names)) | |
70 | (default-slot (slot 'initializer-function) | |
71 | (get-property pset :initializer-function t nil)) | |
72 | (default-slot (slot 'prepare-function) | |
73 | (get-property pset :prepare-function t nil))) | |
74 | ||
75 | (export 'sod-class-effective-slot) | |
76 | (defclass sod-class-effective-slot (effective-slot) | |
77 | ((initializer-function :initarg :initializer-function | |
78 | :type (or symbol function) | |
79 | :reader effective-slot-initializer-function) | |
80 | (prepare-function :initarg :prepare-function :type (or symbol function) | |
81 | :reader effective-slot-prepare-function)) | |
82 | (:documentation | |
83 | "Special class for slots defined on SodClass. | |
84 | ||
85 | This class ignores any explicit initializers and computes initializer | |
86 | values using the slot's INIT-FUNC slot and a magical protocol during | |
87 | metaclass instance construction.")) | |
88 | ||
89 | (defmethod compute-effective-slot ((class sod-class) (slot sod-class-slot)) | |
90 | (make-instance 'sod-class-effective-slot | |
91 | :class class :slot slot | |
92 | :initializer-function (sod-slot-initializer-function slot) | |
93 | :prepare-function (sod-slot-prepare-function slot) | |
94 | :initializer (find-slot-initializer class slot))) | |
95 | ||
96 | ;;;-------------------------------------------------------------------------- | |
97 | ;;; Effective methods. | |
98 | ||
99 | (defmethod print-object ((method effective-method) stream) | |
100 | (maybe-print-unreadable-object (method stream :type t) | |
101 | (format stream "~A ~A" | |
102 | (effective-method-message method) | |
103 | (effective-method-class method)))) | |
104 | ||
105 | (defmethod print-object ((entry method-entry) stream) | |
106 | (maybe-print-unreadable-object (entry stream :type t) | |
107 | (format stream "~A:~A" | |
108 | (method-entry-effective-method entry) | |
109 | (sod-class-nickname (method-entry-chain-head entry))))) | |
110 | ||
111 | (defmethod compute-sod-effective-method | |
112 | ((message sod-message) (class sod-class)) | |
113 | (let ((direct-methods (mappend (lambda (super) | |
114 | (remove message | |
115 | (sod-class-methods super) | |
116 | :key #'sod-method-message | |
117 | :test-not #'eql)) | |
118 | (sod-class-precedence-list class)))) | |
119 | (make-instance (message-effective-method-class message) | |
120 | :message message | |
121 | :class class | |
122 | :direct-methods direct-methods))) | |
123 | ||
124 | (defmethod compute-effective-methods ((class sod-class)) | |
125 | (mapcan (lambda (super) | |
126 | (mapcar (lambda (message) | |
127 | (compute-sod-effective-method message class)) | |
128 | (sod-class-messages super))) | |
129 | (sod-class-precedence-list class))) | |
130 | ||
131 | (defmethod slot-unbound | |
132 | (clos-class (class sod-class) (slot-name (eql 'effective-methods))) | |
133 | (setf (slot-value class 'effective-methods) | |
134 | (compute-effective-methods class))) | |
135 | ||
136 | ;;;-------------------------------------------------------------------------- | |
137 | ;;; Instance layout. | |
138 | ||
139 | ;;; islots | |
140 | ||
141 | (defmethod print-object ((islots islots) stream) | |
142 | (print-unreadable-object (islots stream :type t) | |
143 | (format stream "~A <= ~A ~_~:<~@{~S~^ ~_~}~:>" | |
144 | (islots-subclass islots) | |
145 | (islots-class islots) | |
146 | (islots-slots islots)))) | |
147 | ||
148 | (defmethod compute-islots ((class sod-class) (subclass sod-class)) | |
149 | (make-instance 'islots | |
150 | :class class | |
151 | :subclass subclass | |
152 | :slots (mapcar (lambda (slot) | |
153 | (compute-effective-slot subclass slot)) | |
154 | (sod-class-slots class)))) | |
155 | ||
156 | ;;; vtable-pointer | |
157 | ;;; Do we need a construction protocol here? | |
158 | ||
159 | (defmethod print-object ((vtp vtable-pointer) stream) | |
160 | (print-unreadable-object (vtp stream :type t) | |
161 | (format stream "~A:~A" | |
162 | (vtable-pointer-class vtp) | |
163 | (sod-class-nickname (vtable-pointer-chain-head vtp))))) | |
164 | ||
165 | ;;; ichain | |
166 | ||
167 | (defmethod print-object ((ichain ichain) stream) | |
168 | (print-unreadable-object (ichain stream :type t) | |
169 | (format stream "~A:~A ~_~:<~@{~S~^ ~_~}~:>" | |
170 | (ichain-class ichain) | |
171 | (sod-class-nickname (ichain-head ichain)) | |
172 | (ichain-body ichain)))) | |
173 | ||
174 | (defmethod compute-ichain ((class sod-class) chain) | |
175 | (let* ((chain-head (car chain)) | |
176 | (chain-tail (find chain-head (mapcar #'car (sod-class-chains class)) | |
177 | :key #'sod-class-chain-head)) | |
178 | (vtable-pointer (make-instance 'vtable-pointer | |
179 | :class class | |
180 | :chain-head chain-head | |
181 | :chain-tail chain-tail)) | |
182 | (islots (remove-if-not #'islots-slots | |
183 | (mapcar (lambda (super) | |
184 | (compute-islots super class)) | |
185 | chain)))) | |
186 | (make-instance 'ichain | |
187 | :class class | |
188 | :chain-head chain-head | |
189 | :chain-tail chain-tail | |
190 | :body (cons vtable-pointer islots)))) | |
191 | ||
192 | ;;; ilayout | |
193 | ||
194 | (defmethod print-object ((ilayout ilayout) stream) | |
195 | (print-unreadable-object (ilayout stream :type t) | |
196 | (format stream "~A ~_~:<~@{~S~^ ~_~}~:>" | |
197 | (ilayout-class ilayout) | |
198 | (ilayout-ichains ilayout)))) | |
199 | ||
200 | (defmethod compute-ilayout ((class sod-class)) | |
201 | (make-instance 'ilayout | |
202 | :class class | |
203 | :ichains (mapcar (lambda (chain) | |
204 | (compute-ichain class | |
205 | (reverse chain))) | |
206 | (sod-class-chains class)))) | |
207 | ||
208 | (defmethod slot-unbound | |
209 | (clos-class (class sod-class) (slot-name (eql 'ilayout))) | |
210 | (setf (slot-value class 'ilayout) | |
211 | (compute-ilayout class))) | |
212 | ||
213 | ;;;-------------------------------------------------------------------------- | |
214 | ;;; Vtable layout. | |
215 | ||
216 | ;;; vtmsgs | |
217 | ||
218 | (defmethod print-object ((vtmsgs vtmsgs) stream) | |
219 | (print-unreadable-object (vtmsgs stream :type t) | |
220 | (format stream "~A <= ~A ~_~:<~@{~S~^ ~_~}~:>" | |
221 | (vtmsgs-subclass vtmsgs) | |
222 | (vtmsgs-class vtmsgs) | |
223 | (vtmsgs-entries vtmsgs)))) | |
224 | ||
225 | (defmethod compute-vtmsgs | |
226 | ((class sod-class) | |
227 | (subclass sod-class) | |
228 | (chain-head sod-class) | |
229 | (chain-tail sod-class)) | |
230 | (flet ((make-entry (message) | |
231 | (let ((method (find message | |
232 | (sod-class-effective-methods subclass) | |
233 | :key #'effective-method-message))) | |
234 | (make-method-entry method chain-head chain-tail)))) | |
235 | (make-instance 'vtmsgs | |
236 | :class class | |
237 | :subclass subclass | |
238 | :chain-head chain-head | |
239 | :chain-tail chain-tail | |
240 | :entries (mapcar #'make-entry | |
241 | (sod-class-messages class))))) | |
242 | ||
243 | ;;; class-pointer | |
244 | ||
245 | (defmethod print-object ((cptr class-pointer) stream) | |
246 | (print-unreadable-object (cptr stream :type t) | |
247 | (format stream "~A:~A" | |
248 | (class-pointer-metaclass cptr) | |
249 | (sod-class-nickname (class-pointer-meta-chain-head cptr))))) | |
250 | ||
251 | (defmethod make-class-pointer | |
252 | ((class sod-class) (chain-head sod-class) | |
253 | (metaclass sod-class) (meta-chain-head sod-class)) | |
254 | ||
255 | ;; Slightly tricky. We don't necessarily want a pointer to the metaclass, | |
256 | ;; but to its most specific subclass on the given chain. Fortunately, CL | |
257 | ;; is good at this game. | |
258 | (let* ((meta-chains (sod-class-chains metaclass)) | |
259 | (meta-chain-tails (mapcar #'car meta-chains)) | |
260 | (meta-chain-tail (find meta-chain-head meta-chain-tails | |
261 | :key #'sod-class-chain-head))) | |
262 | (make-instance 'class-pointer | |
263 | :class class | |
264 | :chain-head chain-head | |
265 | :metaclass meta-chain-tail | |
266 | :meta-chain-head meta-chain-head))) | |
267 | ||
268 | ;;; base-offset | |
269 | ||
270 | (defmethod print-object ((boff base-offset) stream) | |
271 | (print-unreadable-object (boff stream :type t) | |
272 | (format stream "~A:~A" | |
273 | (base-offset-class boff) | |
274 | (sod-class-nickname (base-offset-chain-head boff))))) | |
275 | ||
276 | (defmethod make-base-offset ((class sod-class) (chain-head sod-class)) | |
277 | (make-instance 'base-offset | |
278 | :class class | |
279 | :chain-head chain-head)) | |
280 | ||
281 | ;;; chain-offset | |
282 | ||
283 | (defmethod print-object ((choff chain-offset) stream) | |
284 | (print-unreadable-object (choff stream :type t) | |
285 | (format stream "~A:~A->~A" | |
286 | (chain-offset-class choff) | |
287 | (sod-class-nickname (chain-offset-chain-head choff)) | |
288 | (sod-class-nickname (chain-offset-target-head choff))))) | |
289 | ||
290 | (defmethod make-chain-offset | |
291 | ((class sod-class) (chain-head sod-class) (target-head sod-class)) | |
292 | (make-instance 'chain-offset | |
293 | :class class | |
294 | :chain-head chain-head | |
295 | :target-head target-head)) | |
296 | ||
297 | ;;; vtable | |
298 | ||
299 | (defmethod print-object ((vtable vtable) stream) | |
300 | (print-unreadable-object (vtable stream :type t) | |
301 | (format stream "~A:~A ~_~:<~@{~S~^ ~_~}~:>" | |
302 | (vtable-class vtable) | |
303 | (sod-class-nickname (vtable-chain-head vtable)) | |
304 | (vtable-body vtable)))) | |
305 | ||
306 | ;; Special variables used by `compute-vtable'. | |
307 | (defvar *done-metaclass-chains*) | |
308 | (defvar *done-instance-chains*) | |
309 | ||
310 | (defmethod compute-vtable-items | |
311 | ((class sod-class) (super sod-class) (chain-head sod-class) | |
312 | (chain-tail sod-class) (emit function)) | |
313 | ||
314 | ;; If this class introduces new metaclass chains, then emit pointers to | |
315 | ;; them. | |
316 | (let* ((metasuper (sod-class-metaclass super)) | |
317 | (metasuper-chains (sod-class-chains metasuper)) | |
318 | (metasuper-chain-heads (mapcar (lambda (chain) | |
319 | (sod-class-chain-head (car chain))) | |
320 | metasuper-chains))) | |
321 | (dolist (metasuper-chain-head metasuper-chain-heads) | |
322 | (unless (member metasuper-chain-head *done-metaclass-chains*) | |
323 | (funcall emit (make-class-pointer class | |
324 | chain-head | |
325 | metasuper | |
326 | metasuper-chain-head)) | |
327 | (push metasuper-chain-head *done-metaclass-chains*)))) | |
328 | ||
329 | ;; If there are new instance chains, then emit offsets to them. | |
330 | (let* ((chains (sod-class-chains super)) | |
331 | (chain-heads (mapcar (lambda (chain) | |
332 | (sod-class-chain-head (car chain))) | |
333 | chains))) | |
334 | (dolist (head chain-heads) | |
335 | (unless (member head *done-instance-chains*) | |
336 | (funcall emit (make-chain-offset class chain-head head)) | |
337 | (push head *done-instance-chains*)))) | |
338 | ||
339 | ;; Finally, if there are interesting methods, emit those too. | |
340 | (when (sod-class-messages super) | |
341 | (funcall emit (compute-vtmsgs super class chain-head chain-tail)))) | |
342 | ||
343 | (defmethod compute-vtable ((class sod-class) (chain list)) | |
344 | (let* ((chain-head (car chain)) | |
345 | (chain-tail (find chain-head (mapcar #'car (sod-class-chains class)) | |
346 | :key #'sod-class-chain-head)) | |
347 | (*done-metaclass-chains* nil) | |
348 | (*done-instance-chains* (list chain-head)) | |
349 | (done-superclasses nil) | |
350 | (items nil)) | |
351 | (flet ((emit (item) | |
352 | (push item items))) | |
353 | ||
354 | ;; Find the root chain in the metaclass and write a pointer. | |
355 | (let* ((metaclass (sod-class-metaclass class)) | |
356 | (metaclass-root (find-root-metaclass class)) | |
357 | (metaclass-root-head (sod-class-chain-head metaclass-root))) | |
358 | (emit (make-class-pointer class chain-head metaclass | |
359 | metaclass-root-head)) | |
360 | (push metaclass-root-head *done-metaclass-chains*)) | |
361 | ||
362 | ;; Write an offset to the instance base. | |
363 | (emit (make-base-offset class chain-head)) | |
364 | ||
365 | ;; Now walk the chain. As we ascend the chain, scan the class | |
366 | ;; precedence list of each class in reverse to ensure that we have | |
367 | ;; everything interesting. | |
368 | (dolist (super chain) | |
369 | (dolist (sub (reverse (sod-class-precedence-list super))) | |
370 | (unless (member sub done-superclasses) | |
371 | (compute-vtable-items class | |
372 | sub | |
373 | chain-head | |
374 | chain-tail | |
375 | #'emit) | |
376 | (push sub done-superclasses)))) | |
377 | ||
378 | ;; We're through. | |
379 | (make-instance 'vtable | |
380 | :class class | |
381 | :chain-head chain-head | |
382 | :chain-tail chain-tail | |
383 | :body (nreverse items))))) | |
384 | ||
385 | (defmethod compute-vtables ((class sod-class)) | |
386 | (mapcar (lambda (chain) | |
387 | (compute-vtable class (reverse chain))) | |
388 | (sod-class-chains class))) | |
389 | ||
390 | (defmethod slot-unbound | |
391 | (clos-class (class sod-class) (slot-name (eql 'vtables))) | |
392 | (setf (slot-value class 'vtables) | |
393 | (compute-vtables class))) | |
394 | ||
395 | ;;;----- That's all, folks -------------------------------------------------- |