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1 | ;; Common Lisp bindings for GTK+ v2.x |
2 | ;; Copyright 2000-2005 Espen S. Johnsen <espen@users.sf.net> |
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3 | ;; |
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4 | ;; Permission is hereby granted, free of charge, to any person obtaining |
5 | ;; a copy of this software and associated documentation files (the |
6 | ;; "Software"), to deal in the Software without restriction, including |
7 | ;; without limitation the rights to use, copy, modify, merge, publish, |
8 | ;; distribute, sublicense, and/or sell copies of the Software, and to |
9 | ;; permit persons to whom the Software is furnished to do so, subject to |
10 | ;; the following conditions: |
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11 | ;; |
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12 | ;; The above copyright notice and this permission notice shall be |
13 | ;; included in all copies or substantial portions of the Software. |
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14 | ;; |
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15 | ;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
16 | ;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
17 | ;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
18 | ;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
19 | ;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
20 | ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
21 | ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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22 | |
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23 | ;; $Id: proxy.lisp,v 1.20 2005-04-23 16:48:51 espen Exp $ |
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24 | |
25 | (in-package "GLIB") |
26 | |
94f15c3c |
27 | ;;;; Superclass for all metaclasses implementing some sort of virtual slots |
28 | |
29 | (eval-when (:compile-toplevel :load-toplevel :execute) |
9adccb27 |
30 | (defclass virtual-slots-class (standard-class) |
4d83a8a6 |
31 | ()) |
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32 | |
33 | (defclass direct-virtual-slot-definition (standard-direct-slot-definition) |
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34 | ((setter :reader slot-definition-setter :initarg :setter) |
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35 | (getter :reader slot-definition-getter :initarg :getter) |
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36 | (unbound :reader slot-definition-unbound :initarg :unbound) |
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37 | (boundp :reader slot-definition-boundp :initarg :boundp))) |
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38 | |
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39 | (defclass effective-virtual-slot-definition (standard-effective-slot-definition) |
40 | ((setter :reader slot-definition-setter :initarg :setter) |
41 | (getter :reader slot-definition-getter :initarg :getter) |
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42 | (unbound :reader slot-definition-unbound :initarg :unbound) |
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43 | (boundp :reader slot-definition-boundp :initarg :boundp)))) |
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44 | |
45 | (defvar *unbound-marker* (gensym "UNBOUND-MARKER-")) |
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46 | |
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47 | (defun most-specific-slot-value (instances slot &optional |
48 | (default *unbound-marker*)) |
4d83a8a6 |
49 | (let ((object (find-if |
50 | #'(lambda (ob) |
51 | (and (slot-exists-p ob slot) (slot-boundp ob slot))) |
52 | instances))) |
53 | (if object |
54 | (slot-value object slot) |
73572c12 |
55 | default)));) |
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56 | |
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57 | |
58 | |
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59 | (defmethod direct-slot-definition-class ((class virtual-slots-class) &rest initargs) |
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60 | (if (eq (getf initargs :allocation) :virtual) |
61 | (find-class 'direct-virtual-slot-definition) |
62 | (call-next-method))) |
63 | |
9adccb27 |
64 | (defmethod effective-slot-definition-class ((class virtual-slots-class) &rest initargs) |
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65 | (if (eq (getf initargs :allocation) :virtual) |
66 | (find-class 'effective-virtual-slot-definition) |
67 | (call-next-method))) |
68 | |
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69 | |
70 | (defmethod initialize-internal-slot-functions ((slotd effective-virtual-slot-definition)) |
eeda1c2d |
71 | (if (not (slot-boundp slotd 'getter)) |
72 | (setf |
4d83a8a6 |
73 | (slot-value slotd 'reader-function) |
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74 | #'(lambda (object) |
75 | (declare (ignore object)) |
76 | (error "Can't read slot: ~A" (slot-definition-name slotd))) |
77 | (slot-value slotd 'boundp-function) |
78 | #'(lambda (object) (declare (ignore object)) nil)) |
79 | |
80 | (let ((getter-function |
81 | (let ((getter (slot-value slotd 'getter))) |
82 | (etypecase getter |
83 | (function getter) |
84 | (symbol |
85 | #'(lambda (object) |
86 | (funcall getter object))) |
87 | (string |
88 | (let ((reader nil)) |
89 | (setf (slot-value slotd 'reader-function) |
90 | #'(lambda (object) |
91 | (unless reader |
12b7df04 |
92 | (setq reader |
93 | (mkbinding getter |
94 | (slot-definition-type slotd) 'pointer))) |
eeda1c2d |
95 | (funcall reader (proxy-location object)))))))))) |
96 | |
4d83a8a6 |
97 | (setf |
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98 | (slot-value slotd 'boundp-function) |
99 | (cond |
eeda1c2d |
100 | ((slot-boundp slotd 'unbound) |
101 | (let ((unbound-value (slot-value slotd 'unbound))) |
12b7df04 |
102 | #'(lambda (object) |
103 | (not (eq (funcall getter-function object) unbound-value))))) |
104 | ((slot-boundp slotd 'boundp) |
105 | (let ((boundp (slot-value slotd 'boundp))) |
eeda1c2d |
106 | (etypecase boundp |
107 | (function boundp) |
108 | (symbol #'(lambda (object) |
109 | (funcall boundp object))) |
110 | (string (let ((reader ())) |
111 | #'(lambda (object) |
112 | (unless reader |
113 | (setq reader |
114 | (mkbinding boundp |
115 | (slot-definition-type slotd) 'pointer))) |
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116 | (funcall reader (proxy-location object)))))))) |
117 | ((multiple-value-bind (unbound-p unbound-value) |
118 | (unbound-value (slot-definition-type slotd)) |
119 | (when unbound-p |
120 | #'(lambda (object) |
121 | (not (eq (funcall getter-function object) unbound-value)))))) |
122 | (#'(lambda (object) (declare (ignore object)) t)))) |
eeda1c2d |
123 | |
124 | (setf |
125 | (slot-value slotd 'reader-function) |
126 | (cond |
127 | ((slot-boundp slotd 'unbound) |
128 | (let ((unbound (slot-value slotd 'unbound)) |
129 | (slot-name (slot-definition-name slotd))) |
12b7df04 |
130 | #'(lambda (object) |
131 | (let ((value (funcall getter-function object))) |
132 | (if (eq value unbound) |
133 | (slot-unbound (class-of object) object slot-name) |
134 | value))))) |
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135 | ((slot-boundp slotd 'boundp) |
136 | (let ((boundp-function (slot-value slotd 'boundp-function))) |
12b7df04 |
137 | #'(lambda (object) |
138 | (and |
139 | (funcall boundp-function object) |
140 | (funcall getter-function object))))) |
141 | ((multiple-value-bind (unbound-p unbound-value) |
142 | (unbound-value (slot-definition-type slotd)) |
143 | (let ((slot-name (slot-definition-name slotd))) |
144 | (when unbound-p |
145 | #'(lambda (object) |
146 | (let ((value (funcall getter-function object))) |
147 | (if (eq value unbound-value) |
148 | (slot-unbound (class-of object) object slot-name) |
149 | value))))))) |
eeda1c2d |
150 | (getter-function))))) |
151 | |
152 | (setf |
153 | (slot-value slotd 'writer-function) |
154 | (if (not (slot-boundp slotd 'setter)) |
155 | #'(lambda (object) |
156 | (declare (ignore object)) |
157 | (error "Can't set slot: ~A" (slot-definition-name slotd))) |
158 | (with-slots (setter) slotd |
4d83a8a6 |
159 | (etypecase setter |
160 | (function setter) |
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161 | ((or symbol cons) |
162 | #'(lambda (value object) |
163 | (funcall (fdefinition setter) value object))) |
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164 | (string |
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165 | (let ((writer ())) |
166 | (setf |
167 | (slot-value slotd 'writer-function) |
168 | #'(lambda (value object) |
169 | (unless writer |
170 | (setq writer |
171 | (mkbinding setter 'nil 'pointer |
172 | (slot-definition-type slotd)))) |
173 | (funcall writer (proxy-location object) value))))))))) |
174 | |
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175 | (initialize-internal-slot-gfs (slot-definition-name slotd))) |
176 | |
177 | |
178 | |
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179 | (defmethod compute-slot-accessor-info ((slotd effective-virtual-slot-definition) type gf) |
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180 | nil) |
181 | |
9adccb27 |
182 | (defmethod compute-effective-slot-definition-initargs ((class virtual-slots-class) direct-slotds) |
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183 | (if (typep (first direct-slotds) 'direct-virtual-slot-definition) |
184 | (let ((initargs ())) |
185 | (let ((getter (most-specific-slot-value direct-slotds 'getter))) |
186 | (unless (eq getter *unbound-marker*) |
187 | (setf (getf initargs :getter) getter))) |
188 | (let ((setter (most-specific-slot-value direct-slotds 'setter))) |
189 | (unless (eq setter *unbound-marker*) |
190 | (setf (getf initargs :setter) setter))) |
191 | (let ((unbound (most-specific-slot-value direct-slotds 'unbound))) |
192 | (unless (eq unbound *unbound-marker*) |
193 | (setf (getf initargs :unbound) unbound))) |
194 | (let ((boundp (most-specific-slot-value direct-slotds 'boundp))) |
195 | (unless (eq boundp *unbound-marker*) |
196 | (setf (getf initargs :boundp) boundp))) |
197 | (nconc initargs (call-next-method))) |
4d83a8a6 |
198 | (call-next-method))) |
199 | |
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200 | |
94f15c3c |
201 | (defmethod slot-value-using-class |
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202 | ((class virtual-slots-class) (object standard-object) |
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203 | (slotd effective-virtual-slot-definition)) |
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204 | (if (funcall (slot-value slotd 'boundp-function) object) |
205 | (funcall (slot-value slotd 'reader-function) object) |
206 | (slot-unbound class object (slot-definition-name slotd)))) |
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207 | |
94f15c3c |
208 | (defmethod slot-boundp-using-class |
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209 | ((class virtual-slots-class) (object standard-object) |
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210 | (slotd effective-virtual-slot-definition)) |
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211 | (funcall (slot-value slotd 'boundp-function) object)) |
212 | |
213 | (defmethod (setf slot-value-using-class) |
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214 | (value (class virtual-slots-class) (object standard-object) |
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215 | (slotd effective-virtual-slot-definition)) |
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216 | (funcall (slot-value slotd 'writer-function) value object)) |
217 | |
218 | |
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219 | (defmethod validate-superclass |
9adccb27 |
220 | ((class virtual-slots-class) (super standard-class)) |
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221 | t) |
222 | |
223 | |
224 | ;;;; Proxy cache |
225 | |
226 | (internal *instance-cache*) |
227 | (defvar *instance-cache* (make-hash-table :test #'eql)) |
228 | |
229 | (defun cache-instance (instance) |
230 | (setf |
73572c12 |
231 | (gethash (sap-int (proxy-location instance)) *instance-cache*) |
232 | (make-weak-pointer instance))) |
94f15c3c |
233 | |
234 | (defun find-cached-instance (location) |
73572c12 |
235 | (let ((ref (gethash (sap-int location) *instance-cache*))) |
94f15c3c |
236 | (when ref |
73572c12 |
237 | (weak-pointer-value ref)))) |
94f15c3c |
238 | |
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239 | (defun instance-cached-p (location) |
73572c12 |
240 | (gethash (sap-int location) *instance-cache*)) |
0f134a29 |
241 | |
94f15c3c |
242 | (defun remove-cached-instance (location) |
73572c12 |
243 | (remhash (sap-int location) *instance-cache*)) |
94f15c3c |
244 | |
9adccb27 |
245 | ;; For debuging |
246 | (defun cached-instances () |
247 | (let ((instances ())) |
248 | (maphash #'(lambda (location ref) |
249 | (declare (ignore location)) |
73572c12 |
250 | (push (weak-pointer-value ref) instances)) |
9adccb27 |
251 | *instance-cache*) |
252 | instances)) |
253 | |
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254 | |
255 | |
256 | ;;;; Proxy for alien instances |
257 | |
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258 | (defclass proxy () |
259 | ((location :reader proxy-location :type system-area-pointer))) |
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260 | |
9adccb27 |
261 | (defgeneric initialize-proxy (object &rest initargs)) |
262 | (defgeneric instance-finalizer (object)) |
263 | (defgeneric reference-foreign (class location)) |
264 | (defgeneric unreference-foreign (class location)) |
265 | |
3b167652 |
266 | (defmethod reference-foreign ((name symbol) location) |
267 | (reference-foreign (find-class name) location)) |
268 | |
269 | (defmethod unreference-foreign ((name symbol) location) |
270 | (unreference-foreign (find-class name) location)) |
271 | |
9adccb27 |
272 | (defmethod unreference-foreign :around ((class class) location) |
273 | (unless (null-pointer-p location) |
274 | ;; (format t "Unreferencing ~A at ~A" (class-name class) location) |
275 | ;; (finish-output *standard-output*) |
276 | (call-next-method) |
277 | ;; (write-line " done") |
278 | ;; (finish-output *standard-output*) |
279 | )) |
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280 | |
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281 | (defmethod print-object ((instance proxy) stream) |
282 | (print-unreadable-object (instance stream :type t :identity nil) |
eeda1c2d |
283 | (when (slot-boundp instance 'location) |
284 | (format stream "at 0x~X" (sap-int (proxy-location instance)))))) |
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285 | |
9adccb27 |
286 | (defmethod initialize-instance :around ((instance proxy) &key location) |
287 | (if location |
288 | (setf (slot-value instance 'location) location) |
289 | (call-next-method)) |
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290 | (cache-instance instance) |
73572c12 |
291 | (finalize instance (instance-finalizer instance)) |
9adccb27 |
292 | instance) |
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293 | |
294 | (defmethod instance-finalizer ((instance proxy)) |
9adccb27 |
295 | (let ((location (proxy-location instance)) |
296 | (class (class-of instance))) |
297 | ;; (unless (find-method #'unreference-foreign nil (list (class-of class) t) nil) |
298 | ;; (error "No matching method for UNREFERENCE-INSTANCE when called with class ~A" class)) |
299 | #'(lambda () |
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300 | (remove-cached-instance location) |
9adccb27 |
301 | (unreference-foreign class location)))) |
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302 | |
94f15c3c |
303 | |
304 | ;;;; Metaclass used for subclasses of proxy |
305 | |
73572c12 |
306 | (defgeneric most-specific-proxy-superclass (class)) |
307 | (defgeneric direct-proxy-superclass (class)) |
308 | |
309 | |
94f15c3c |
310 | (eval-when (:compile-toplevel :load-toplevel :execute) |
9adccb27 |
311 | (defclass proxy-class (virtual-slots-class) |
312 | ((size :reader proxy-instance-size))) |
94f15c3c |
313 | |
314 | (defclass direct-alien-slot-definition (direct-virtual-slot-definition) |
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315 | ((allocation :initform :alien) |
316 | (offset :reader slot-definition-offset :initarg :offset))) |
94f15c3c |
317 | |
318 | (defclass effective-alien-slot-definition (effective-virtual-slot-definition) |
4d83a8a6 |
319 | ((offset :reader slot-definition-offset :initarg :offset))) |
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320 | |
94f15c3c |
321 | (defmethod most-specific-proxy-superclass ((class proxy-class)) |
322 | (find-if |
323 | #'(lambda (class) |
324 | (subtypep (class-name class) 'proxy)) |
4d83a8a6 |
325 | (cdr (compute-class-precedence-list class)))) |
73572c12 |
326 | |
12d0437e |
327 | (defmethod direct-proxy-superclass ((class proxy-class)) |
328 | (find-if |
329 | #'(lambda (class) |
330 | (subtypep (class-name class) 'proxy)) |
4d83a8a6 |
331 | (class-direct-superclasses class))) |
332 | |
eeda1c2d |
333 | (defmethod shared-initialize ((class proxy-class) names &key size) |
94f15c3c |
334 | (call-next-method) |
12d0437e |
335 | (cond |
4d83a8a6 |
336 | (size (setf (slot-value class 'size) (first size))) |
9adccb27 |
337 | ((slot-boundp class 'size) (slot-makunbound class 'size)))) |
4d83a8a6 |
338 | |
339 | (defmethod direct-slot-definition-class ((class proxy-class) &rest initargs) |
94f15c3c |
340 | (case (getf initargs :allocation) |
341 | ((nil :alien) (find-class 'direct-alien-slot-definition)) |
94f15c3c |
342 | (t (call-next-method)))) |
4d83a8a6 |
343 | |
344 | (defmethod effective-slot-definition-class ((class proxy-class) &rest initargs) |
94f15c3c |
345 | (case (getf initargs :allocation) |
346 | (:alien (find-class 'effective-alien-slot-definition)) |
94f15c3c |
347 | (t (call-next-method)))) |
348 | |
4d83a8a6 |
349 | |
350 | (defmethod compute-effective-slot-definition-initargs ((class proxy-class) direct-slotds) |
351 | (if (eq (most-specific-slot-value direct-slotds 'allocation) :alien) |
352 | (nconc |
353 | (list :offset (most-specific-slot-value direct-slotds 'offset)) |
354 | (call-next-method)) |
355 | (call-next-method))) |
356 | |
357 | |
358 | (defmethod initialize-internal-slot-functions ((slotd effective-alien-slot-definition)) |
359 | (with-slots (offset) slotd |
9adccb27 |
360 | (let ((type (slot-definition-type slotd))) |
eeda1c2d |
361 | (unless (slot-boundp slotd 'getter) |
9adccb27 |
362 | (let ((reader (reader-function type))) |
363 | (setf |
eeda1c2d |
364 | (slot-value slotd 'getter) |
9adccb27 |
365 | #'(lambda (object) |
366 | (funcall reader (proxy-location object) offset))))) |
4d83a8a6 |
367 | |
eeda1c2d |
368 | (unless (slot-boundp slotd 'setter) |
9adccb27 |
369 | (let ((writer (writer-function type)) |
370 | (destroy (destroy-function type))) |
371 | (setf |
eeda1c2d |
372 | (slot-value slotd 'setter) |
9adccb27 |
373 | #'(lambda (value object) |
374 | (let ((location (proxy-location object))) |
375 | (funcall destroy location offset) ; destroy old value |
eeda1c2d |
376 | (funcall writer value location offset)))))))) |
377 | |
4d83a8a6 |
378 | (call-next-method)) |
379 | |
380 | |
4d83a8a6 |
381 | ;; TODO: call some C code to detect this a compile time |
382 | (defconstant +struct-alignmen+ 4) |
94f15c3c |
383 | |
384 | (defmethod compute-slots ((class proxy-class)) |
4d83a8a6 |
385 | (loop |
3b167652 |
386 | with offset = (let ((size-of-super-classes |
387 | (proxy-instance-size |
388 | (most-specific-proxy-superclass class)))) |
389 | (+ size-of-super-classes |
390 | (mod size-of-super-classes +struct-alignmen+))) |
4d83a8a6 |
391 | with size = offset |
392 | for slotd in (class-direct-slots class) |
393 | when (eq (slot-definition-allocation slotd) :alien) |
394 | do (if (not (slot-boundp slotd 'offset)) |
395 | (setf (slot-value slotd 'offset) offset) |
396 | (setq offset (slot-value slotd 'offset))) |
397 | |
398 | (incf offset (size-of (slot-definition-type slotd))) |
399 | (incf offset (mod offset +struct-alignmen+)) |
400 | (setq size (max size offset)) |
401 | |
402 | finally (unless (slot-boundp class 'size) |
403 | (setf (slot-value class 'size) size))) |
94f15c3c |
404 | (call-next-method)) |
3e15002d |
405 | |
4d83a8a6 |
406 | |
407 | (defmethod validate-superclass ((class proxy-class) (super standard-class)) |
408 | (subtypep (class-name super) 'proxy)) |
409 | |
9adccb27 |
410 | (defmethod proxy-instance-size (class) |
12d0437e |
411 | (declare (ignore class)) |
412 | 0) |
47a11c16 |
413 | |
414 | (defmethod proxy-instance-size ((class-name symbol)) |
415 | (proxy-instance-size (find-class class-name))) |
4d83a8a6 |
416 | ) |
417 | |
9adccb27 |
418 | (defmethod alien-type ((class proxy-class) &rest args) |
419 | (declare (ignore class args)) |
420 | (alien-type 'pointer)) |
421 | |
422 | (defmethod size-of ((class proxy-class) &rest args) |
423 | (declare (ignore class args)) |
424 | (size-of 'pointer)) |
425 | |
426 | (defmethod from-alien-form (location (class proxy-class) &rest args) |
427 | (declare (ignore args)) |
428 | `(ensure-proxy-instance ',(class-name class) ,location)) |
429 | |
430 | (defmethod from-alien-function ((class proxy-class) &rest args) |
431 | (declare (ignore args)) |
432 | #'(lambda (location) |
433 | (ensure-proxy-instance class location))) |
94f15c3c |
434 | |
9adccb27 |
435 | (defmethod to-alien-form (instance (class proxy-class) &rest args) |
436 | (declare (ignore class args)) |
437 | `(proxy-location ,instance)) |
94f15c3c |
438 | |
9adccb27 |
439 | (defmethod to-alien-function ((class proxy-class) &rest args) |
440 | (declare (ignore class args)) |
441 | #'proxy-location) |
442 | |
9ca5565a |
443 | (defmethod copy-from-alien-form (location (class proxy-class) &rest args) |
444 | (declare (ignore args)) |
445 | (let ((class-name (class-name class))) |
446 | `(ensure-proxy-instance ',class-name |
447 | (reference-foreign ',class-name ,location)))) |
448 | |
449 | (defmethod copy-from-alien-function ((class proxy-class) &rest args) |
450 | (declare (ignore args)) |
451 | #'(lambda (location) |
452 | (ensure-proxy-instance class (reference-foreign class location)))) |
453 | |
454 | (defmethod copy-to-alien-form (instance (class proxy-class) &rest args) |
455 | (declare (ignore args)) |
456 | `(reference-foreign ',(class-name class) (proxy-location ,instance))) |
457 | |
458 | (defmethod copy-to-alien-function ((class proxy-class) &rest args) |
73572c12 |
459 | (declare (ignore args)) |
9ca5565a |
460 | #'(lambda (instance) |
461 | (reference-foreign class (proxy-location instance)))) |
462 | |
9adccb27 |
463 | (defmethod writer-function ((class proxy-class) &rest args) |
464 | (declare (ignore args)) |
465 | #'(lambda (instance location &optional (offset 0)) |
466 | (assert (null-pointer-p (sap-ref-sap location offset))) |
467 | (setf |
468 | (sap-ref-sap location offset) |
469 | (reference-foreign class (proxy-location instance))))) |
94f15c3c |
470 | |
9adccb27 |
471 | (defmethod reader-function ((class proxy-class) &rest args) |
472 | (declare (ignore args)) |
473 | #'(lambda (location &optional (offset 0)) |
9ca5565a |
474 | (let ((instance (sap-ref-sap location offset))) |
475 | (unless (null-pointer-p instance) |
476 | (ensure-proxy-instance class (reference-foreign class instance)))))) |
94f15c3c |
477 | |
9adccb27 |
478 | (defmethod destroy-function ((class proxy-class) &rest args) |
479 | (declare (ignore args)) |
480 | #'(lambda (location &optional (offset 0)) |
481 | (unreference-foreign class (sap-ref-sap location offset)))) |
482 | |
12b7df04 |
483 | (defmethod unbound-value ((class proxy-class) &rest args) |
47a11c16 |
484 | (declare (ignore args)) |
12b7df04 |
485 | (values t nil)) |
9adccb27 |
486 | |
487 | (defgeneric ensure-proxy-instance (class location) |
488 | (:documentation "Returns a proxy object representing the foreign object at the give location.")) |
489 | |
490 | (defmethod ensure-proxy-instance :around (class location) |
491 | (unless (null-pointer-p location) |
492 | (or |
493 | (find-cached-instance location) |
494 | (call-next-method)))) |
495 | |
496 | (defmethod ensure-proxy-instance ((class symbol) location) |
497 | (ensure-proxy-instance (find-class class) location)) |
498 | |
499 | (defmethod ensure-proxy-instance ((class proxy-class) location) |
500 | (make-instance class :location location)) |
94f15c3c |
501 | |
12d0437e |
502 | |
503 | ;;;; Superclasses for wrapping of C structures |
94f15c3c |
504 | |
9adccb27 |
505 | (defclass struct (proxy) |
506 | () |
507 | (:metaclass proxy-class)) |
94f15c3c |
508 | |
9adccb27 |
509 | (defmethod initialize-instance ((struct struct) &rest initargs) |
94f15c3c |
510 | (declare (ignore initargs)) |
ec1a4146 |
511 | (unless (slot-boundp struct 'location) |
512 | (let ((size (proxy-instance-size (class-of struct)))) |
513 | (if (zerop size) |
514 | (error "~A has zero size" (class-of struct)) |
47a11c16 |
515 | (setf (slot-value struct 'location) (allocate-memory size))))) |
94f15c3c |
516 | (call-next-method)) |
517 | |
518 | |
9adccb27 |
519 | ;;;; Metaclasses used for subclasses of struct |
520 | |
521 | (defclass struct-class (proxy-class) |
522 | ()) |
94f15c3c |
523 | |
9adccb27 |
524 | (defmethod reference-foreign ((class struct-class) location) |
525 | (copy-memory location (proxy-instance-size class))) |
526 | |
527 | (defmethod unreference-foreign ((class struct-class) location) |
12d0437e |
528 | (deallocate-memory location)) |
94f15c3c |
529 | |
530 | |
9adccb27 |
531 | (defclass static-struct-class (struct-class) |
532 | ()) |
94f15c3c |
533 | |
9adccb27 |
534 | (defmethod reference-foreign ((class static-struct-class) location) |
535 | (declare (ignore class)) |
12d0437e |
536 | location) |
94f15c3c |
537 | |
9adccb27 |
538 | (defmethod unreference-foreign ((class static-struct-class) location) |
539 | (declare (ignore class location)) |
12d0437e |
540 | nil) |