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1 | ;; Common Lisp bindings for GTK+ v2.0 |
2 | ;; Copyright (C) 2000 Espen S. Johnsen <esj@stud.cs.uit.no> |
3 | ;; |
4 | ;; This library is free software; you can redistribute it and/or |
5 | ;; modify it under the terms of the GNU Lesser General Public |
6 | ;; License as published by the Free Software Foundation; either |
7 | ;; version 2 of the License, or (at your option) any later version. |
8 | ;; |
9 | ;; This library is distributed in the hope that it will be useful, |
10 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | ;; Lesser General Public License for more details. |
13 | ;; |
14 | ;; You should have received a copy of the GNU Lesser General Public |
15 | ;; License along with this library; if not, write to the Free Software |
16 | ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | |
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18 | ;; $Id: proxy.lisp,v 1.2 2001-04-30 11:25:25 espen Exp $ |
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19 | |
20 | (in-package "GLIB") |
21 | |
22 | |
23 | ;;;; Superclass for all metaclasses implementing some sort of virtual slots |
24 | |
25 | (eval-when (:compile-toplevel :load-toplevel :execute) |
26 | (defclass virtual-class (pcl::standard-class)) |
27 | |
28 | (defclass direct-virtual-slot-definition (standard-direct-slot-definition) |
29 | ((location |
30 | :reader slot-definition-location |
31 | :initarg :location))) |
32 | |
33 | (defclass effective-virtual-slot-definition |
34 | (standard-effective-slot-definition))) |
35 | |
36 | |
37 | (defmethod direct-slot-definition-class ((class virtual-class) initargs) |
38 | (if (eq (getf initargs :allocation) :virtual) |
39 | (find-class 'direct-virtual-slot-definition) |
40 | (call-next-method))) |
41 | |
42 | |
43 | (defmethod effective-slot-definition-class ((class virtual-class) initargs) |
44 | (if (eq (getf initargs :allocation) :virtual) |
45 | (find-class 'effective-virtual-slot-definition) |
46 | (call-next-method))) |
47 | |
48 | |
49 | (defun %direct-slot-definitions-slot-value (slotds slot &optional default) |
50 | (let ((slotd |
51 | (find-if |
52 | #'(lambda (slotd) |
53 | (and |
54 | (slot-exists-p slotd slot) |
55 | (slot-boundp slotd slot))) |
56 | slotds))) |
57 | (if slotd |
58 | (slot-value slotd slot) |
59 | default))) |
60 | |
61 | |
62 | (defgeneric compute-virtual-slot-location (class slotd direct-slotds)) |
63 | |
64 | (defmethod compute-virtual-slot-location |
65 | ((class virtual-class) |
66 | (slotd effective-virtual-slot-definition) |
67 | direct-slotds) |
68 | (let ((location |
69 | (%direct-slot-definitions-slot-value direct-slotds 'location))) |
70 | (if (and location (symbolp location)) |
71 | (list location `(setf ,location)) |
72 | location))) |
73 | |
74 | |
75 | (defmethod compute-effective-slot-definition |
76 | ((class virtual-class) direct-slotds) |
77 | (let ((slotd (call-next-method))) |
78 | (when (typep slotd 'effective-virtual-slot-definition) |
79 | (setf |
80 | (slot-value slotd 'pcl::location) |
81 | (compute-virtual-slot-location class slotd direct-slotds))) |
82 | slotd)) |
83 | |
84 | |
85 | (defmethod slot-value-using-class |
86 | ((class virtual-class) (object standard-object) |
87 | (slotd effective-virtual-slot-definition)) |
88 | (let ((reader (first (slot-definition-location slotd)))) |
89 | (if reader |
90 | (funcall reader object) |
91 | (slot-unbound class object (slot-definition-name slotd))))) |
92 | |
93 | |
94 | (defmethod slot-boundp-using-class |
95 | ((class virtual-class) (object standard-object) |
96 | (slotd effective-virtual-slot-definition)) |
97 | (and (first (slot-definition-location slotd)) t)) |
98 | |
99 | |
100 | |
101 | (defmethod (setf slot-value-using-class) |
102 | (value (class virtual-class) (object standard-object) |
103 | (slotd effective-virtual-slot-definition)) |
104 | (let ((writer (second (slot-definition-location slotd)))) |
105 | (cond |
106 | ((null writer) |
107 | (error |
108 | "Can't set read-only slot ~A in ~A" |
109 | (slot-definition-name slotd) |
110 | object)) |
111 | ((or (functionp writer) (symbolp writer)) |
112 | (funcall writer value object) |
113 | value) |
114 | (t |
115 | (funcall (fdefinition writer) value object) |
116 | value)))) |
117 | |
118 | |
119 | (defmethod validate-superclass |
120 | ((class virtual-class) (super pcl::standard-class)) |
121 | t) |
122 | |
123 | |
124 | ;;;; Proxy cache |
125 | |
126 | (internal *instance-cache*) |
127 | (defvar *instance-cache* (make-hash-table :test #'eql)) |
128 | |
129 | (defun cache-instance (instance) |
130 | (setf |
131 | (gethash (system:sap-int (proxy-location instance)) *instance-cache*) |
132 | (ext:make-weak-pointer instance))) |
133 | |
134 | (defun find-cached-instance (location) |
135 | (let ((ref (gethash (system:sap-int location) *instance-cache*))) |
136 | (when ref |
137 | (ext:weak-pointer-value ref)))) |
138 | |
139 | (defun remove-cached-instance (location) |
140 | (remhash (system:sap-int location) *instance-cache*)) |
141 | |
142 | |
143 | |
144 | ;;;; Proxy for alien instances |
145 | |
146 | (eval-when (:compile-toplevel :load-toplevel :execute) |
147 | (defclass proxy () |
148 | ((location |
149 | :reader proxy-location |
150 | :type system-area-pointer))) |
151 | |
152 | (defgeneric initialize-proxy (object &rest initargs)) |
153 | (defgeneric instance-finalizer (object))) |
154 | |
155 | |
156 | (defmethod initialize-instance :after ((instance proxy) |
157 | &rest initargs &key) |
158 | (declare (ignore initargs)) |
159 | (cache-instance instance) |
160 | (ext:finalize instance (instance-finalizer instance))) |
161 | |
162 | |
163 | (defmethod initialize-proxy ((instance proxy) |
164 | &rest initargs) |
165 | (declare (ignore initargs)) |
166 | (cache-instance instance)) |
167 | |
168 | |
169 | (defmethod instance-finalizer ((instance proxy)) |
170 | (let ((location (proxy-location instance))) |
171 | #'(lambda () |
172 | (remove-cached-instance location)))) |
173 | |
174 | |
175 | (deftype-method translate-type-spec proxy (type-spec) |
176 | (declare (ignore type-spec)) |
177 | (translate-type-spec 'pointer)) |
178 | |
179 | (deftype-method size-of proxy (type-spec) |
180 | (declare (ignore type-spec)) |
181 | (size-of 'pointer)) |
182 | |
183 | (deftype-method translate-from-alien |
184 | proxy (type-spec location &optional weak-ref) |
185 | `(let ((location ,location)) |
186 | (unless (null-pointer-p location) |
187 | (ensure-proxy-instance ',type-spec location ,weak-ref)))) |
188 | |
189 | |
190 | |
191 | ;;;; Metaclass used for subclasses of proxy |
192 | |
193 | (eval-when (:compile-toplevel :load-toplevel :execute) |
194 | (defclass proxy-class (virtual-class) |
195 | ((size :reader proxy-class-instance-size))) |
196 | |
197 | (defclass direct-alien-slot-definition (direct-virtual-slot-definition) |
198 | ((allocation |
199 | :initform :alien) |
200 | (offset |
201 | :reader slot-definition-offset |
202 | :initarg :offset |
203 | :initform 0))) |
204 | |
205 | (defclass effective-alien-slot-definition (effective-virtual-slot-definition) |
206 | ((offset :reader slot-definition-offset))) |
207 | |
208 | (defclass effective-virtual-alien-slot-definition |
209 | (effective-virtual-slot-definition)) |
210 | |
211 | |
212 | (defmethod most-specific-proxy-superclass ((class proxy-class)) |
213 | (find-if |
214 | #'(lambda (class) |
215 | (subtypep (class-name class) 'proxy)) |
216 | (cdr (pcl::compute-class-precedence-list class)))) |
217 | |
218 | |
219 | (defmethod shared-initialize ((class proxy-class) names |
220 | &rest initargs &key size name) |
221 | (declare (ignore initargs)) |
222 | (call-next-method) |
223 | (when size |
224 | (setf (slot-value class 'size) (first size)))) |
225 | |
226 | |
227 | (defmethod shared-initialize :after ((class proxy-class) names |
228 | &rest initargs &key) |
229 | (declare (ignore initargs names)) |
230 | (let* ((super (most-specific-proxy-superclass class)) |
231 | (actual-size |
232 | (if (eq (class-name super) 'proxy) |
233 | 0 |
234 | (proxy-class-instance-size super)))) |
235 | (dolist (slotd (class-slots class)) |
236 | (when (eq (slot-definition-allocation slotd) :alien) |
237 | (with-slots (offset type) slotd |
238 | (setq actual-size (max actual-size (+ offset (size-of type))))))) |
239 | (cond |
240 | ((not (slot-boundp class 'size)) |
241 | (setf (slot-value class 'size) actual-size)) |
242 | ((> actual-size (slot-value class 'size)) |
243 | (warn "The actual size of class ~A is lager than specified" class))))) |
244 | |
245 | |
246 | (defmethod direct-slot-definition-class ((class proxy-class) initargs) |
247 | (case (getf initargs :allocation) |
248 | ((nil :alien) (find-class 'direct-alien-slot-definition)) |
249 | ; (:instance (error "Allocation :instance not allowed in class ~A" class)) |
250 | (t (call-next-method)))) |
251 | |
252 | |
253 | (defmethod effective-slot-definition-class ((class proxy-class) initargs) |
254 | (case (getf initargs :allocation) |
255 | (:alien (find-class 'effective-alien-slot-definition)) |
256 | (:virtual (find-class 'effective-virtual-alien-slot-definition)) |
257 | (t (call-next-method)))) |
258 | |
259 | |
260 | (defmethod compute-virtual-slot-location |
261 | ((class proxy-class) (slotd effective-alien-slot-definition) |
262 | direct-slotds) |
263 | (with-slots (offset type) slotd |
264 | (setf offset (%direct-slot-definitions-slot-value direct-slotds 'offset)) |
265 | (let ((reader (intern-reader-function type)) |
266 | (writer (intern-writer-function type)) |
267 | (destroy (intern-destroy-function type))) |
268 | (list |
269 | #'(lambda (object) |
270 | (funcall reader (proxy-location object) offset)) |
271 | #'(lambda (value object) |
272 | (let ((location (proxy-location object))) |
273 | (funcall destroy location offset) |
274 | (funcall writer value location offset))))))) |
275 | |
276 | |
277 | (defmethod compute-virtual-slot-location |
278 | ((class proxy-class) |
279 | (slotd effective-virtual-alien-slot-definition) |
280 | direct-slotds) |
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281 | (let ((location (call-next-method)) |
282 | (class-name (class-name class))) |
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283 | (if (or (stringp location) (consp location)) |
284 | (destructuring-bind (reader &optional writer) (mklist location) |
285 | (with-slots (type) slotd |
286 | (list |
287 | (if (stringp reader) |
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288 | (mkbinding reader type class-name) |
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289 | reader) |
290 | (if (stringp writer) |
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291 | (let ((writer (mkbinding writer 'nil class-name type))) |
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292 | #'(lambda (value object) |
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293 | (funcall writer object value))) |
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294 | writer)))) |
295 | location))) |
296 | |
297 | |
298 | (defmethod compute-slots ((class proxy-class)) |
299 | ;; Translating the user supplied relative (to previous slot) offsets |
300 | ;; to absolute offsets. |
301 | ;; This code is broken and have to be fixed. |
302 | (with-slots (direct-slots) class |
303 | (let* ((super (most-specific-proxy-superclass class)) |
304 | (slot-offset |
305 | (if (eq (class-name super) 'proxy) |
306 | 0 |
307 | (proxy-class-instance-size super)))) |
308 | (dolist (slotd direct-slots) |
309 | (when (eq (slot-definition-allocation slotd) :alien) |
310 | (with-slots (offset type) slotd |
311 | (setf |
312 | offset (+ slot-offset offset) |
313 | slot-offset (+ offset (size-of type))))))) |
314 | |
315 | ;; Reverse the direct slot definitions so the effective slots |
316 | ;; will be in correct order. |
317 | (setf direct-slots (reverse direct-slots)) |
318 | ;; This nreverse caused me so much frustration that I leave it |
319 | ;; here just as a reminder of what not to do. |
320 | ; (setf direct-slots (nreverse direct-slots)) |
321 | ) |
322 | (call-next-method)) |
323 | |
324 | |
325 | (defmethod validate-superclass ((class proxy-class) |
326 | (super pcl::standard-class)) |
327 | (subtypep (class-name super) 'proxy)) |
328 | |
329 | (defgeneric make-proxy-instance (class location weak-ref &rest initargs &key))) |
330 | |
331 | |
332 | (defmethod make-proxy-instance ((class symbol) location weak-ref |
333 | &rest initargs &key) |
334 | (apply #'make-proxy-instance (find-class class) location weak-ref initargs)) |
335 | |
336 | (defmethod make-proxy-instance ((class proxy-class) location weak-ref |
337 | &rest initargs &key) |
338 | (let ((instance (allocate-instance class))) |
339 | (apply |
340 | #'initialize-proxy |
341 | instance :location location :weak-ref weak-ref initargs) |
342 | instance)) |
343 | |
344 | (defun ensure-proxy-instance (class location weak-ref &rest initargs) |
345 | (or |
346 | (find-cached-instance location) |
347 | (apply #'make-proxy-instance class location weak-ref initargs))) |
348 | |
349 | |
350 | ;;;; Superclass for wrapping of C structures |
351 | |
352 | (eval-when (:compile-toplevel :load-toplevel :execute) |
353 | (defclass alien-structure (proxy) |
354 | () |
355 | (:metaclass proxy-class) |
356 | (:size 0))) |
357 | |
358 | |
359 | (defmethod initialize-instance ((structure alien-structure) |
360 | &rest initargs) |
361 | (declare (ignore initargs)) |
362 | (setf |
363 | (slot-value structure 'location) |
364 | (allocate-memory (proxy-class-instance-size (class-of structure)))) |
365 | (call-next-method)) |
366 | |
367 | |
368 | (defmethod initialize-proxy ((structure alien-structure) |
369 | &rest initargs &key location weak-ref) |
370 | (declare (ignore initargs)) |
371 | (setf |
372 | (slot-value structure 'location) |
373 | (if weak-ref |
374 | (copy-memory location (proxy-class-instance-size (class-of structure))) |
375 | location)) |
376 | (call-next-method)) |
377 | |
378 | |
379 | (defmethod instance-finalizer ((structure alien-structure)) |
380 | (let ((location (proxy-location structure))) |
381 | (declare (type system-area-pointer location)) |
382 | #'(lambda () |
383 | (deallocate-memory location) |
384 | (remove-cached-instance location)))) |
385 | |
386 | |
387 | (deftype-method translate-to-alien |
388 | alien-structure (type-spec object &optional weak-ref) |
389 | (if weak-ref |
390 | `(proxy-location ,object) |
391 | `(copy-memory |
392 | (proxy-location ,object) |
393 | ,(proxy-class-instance-size (find-class type-spec))))) |
394 | |
395 | |
396 | (deftype-method unreference-alien alien-structure (type-spec c-struct) |
397 | (declare (ignore type-spec)) |
398 | `(deallocate-memory ,c-struct)) |