1 ;; Common Lisp bindings for GTK+ v2.0
2 ;; Copyright (C) 2000 Espen S. Johnsen <esj@stud.cs.uit.no>
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.
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.
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
18 ;; $Id: proxy.lisp,v 1.4 2001-05-11 16:01:41 espen Exp $
23 ;;;; Superclass for all metaclasses implementing some sort of virtual slots
25 (eval-when (:compile-toplevel :load-toplevel :execute)
26 (defclass virtual-slot-class (pcl::standard-class))
28 (defclass direct-virtual-slot-definition (standard-direct-slot-definition)
29 ((setter :reader slot-definition-setter :initarg :setter)
30 (getter :reader slot-definition-getter :initarg :getter)))
32 (defclass effective-virtual-slot-definition
33 (standard-effective-slot-definition)))
36 (defmethod direct-slot-definition-class ((class virtual-slot-class) initargs)
37 (if (eq (getf initargs :allocation) :virtual)
38 (find-class 'direct-virtual-slot-definition)
41 (defmethod effective-slot-definition-class ((class virtual-slot-class) initargs)
42 (if (eq (getf initargs :allocation) :virtual)
43 (find-class 'effective-virtual-slot-definition)
46 (defun %most-specific-slot-value (slotds slot &optional default)
51 (slot-exists-p slotd slot)
52 (slot-boundp slotd slot)))
55 (slot-value slotd slot)
58 (defgeneric compute-virtual-slot-accessors (class slotd direct-slotds))
60 (defmethod compute-virtual-slot-accessors
61 ((class virtual-slot-class)
62 (slotd effective-virtual-slot-definition)
64 (let ((getter (%most-specific-slot-value direct-slotds 'getter))
65 (setter (%most-specific-slot-value direct-slotds 'setter)))
66 (list getter setter)))
68 (defmethod compute-effective-slot-definition
69 ((class virtual-slot-class) direct-slotds)
70 (let ((slotd (call-next-method)))
71 (when (typep slotd 'effective-virtual-slot-definition)
73 (slot-value slotd 'pcl::location)
74 (compute-virtual-slot-accessors class slotd direct-slotds)))
77 (defmethod slot-value-using-class
78 ((class virtual-slot-class) (object standard-object)
79 (slotd effective-virtual-slot-definition))
80 (let ((reader (first (slot-definition-location slotd))))
82 (funcall reader object)
83 (slot-unbound class object (slot-definition-name slotd)))))
85 (defmethod slot-boundp-using-class
86 ((class virtual-slot-class) (object standard-object)
87 (slotd effective-virtual-slot-definition))
88 (and (first (slot-definition-location slotd)) t))
90 (defmethod (setf slot-value-using-class)
91 (value (class virtual-slot-class) (object standard-object)
92 (slotd effective-virtual-slot-definition))
93 (let ((setter (second (slot-definition-location slotd))))
97 "Can't set read-only slot ~A in ~A"
98 (slot-definition-name slotd)
100 ((or (functionp setter) (symbolp setter))
101 (funcall setter value object)
104 (funcall (fdefinition setter) value object)
107 (defmethod validate-superclass
108 ((class virtual-slot-class) (super pcl::standard-class))
114 (internal *instance-cache*)
115 (defvar *instance-cache* (make-hash-table :test #'eql))
117 (defun cache-instance (instance)
119 (gethash (system:sap-int (proxy-location instance)) *instance-cache*)
120 (ext:make-weak-pointer instance)))
122 (defun find-cached-instance (location)
123 (let ((ref (gethash (system:sap-int location) *instance-cache*)))
125 (ext:weak-pointer-value ref))))
127 (defun remove-cached-instance (location)
128 (remhash (system:sap-int location) *instance-cache*))
132 ;;;; Proxy for alien instances
134 (eval-when (:compile-toplevel :load-toplevel :execute)
136 ((location :reader proxy-location :type system-area-pointer)))
138 (defgeneric initialize-proxy (object &rest initargs))
139 (defgeneric instance-finalizer (object)))
142 (defmethod initialize-instance :after ((instance proxy)
144 (declare (ignore initargs))
145 (cache-instance instance)
146 (ext:finalize instance (instance-finalizer instance)))
148 (defmethod initialize-proxy ((instance proxy)
149 &rest initargs &key location weak-ref)
150 (declare (ignore initargs))
152 (slot-value instance 'location)
155 (proxy-class-copy (class-of instance))
156 (type-of instance) location)
158 (cache-instance instance)
159 (ext:finalize instance (instance-finalizer instance)))
161 (defmethod instance-finalizer ((instance proxy))
162 (let ((free (proxy-class-free (class-of instance)))
163 (type (type-of instance))
164 (location (proxy-location instance)))
167 (type system-area-pointer location))
169 (funcall free type location)
170 (remove-cached-instance location))))
173 (deftype-method translate-type-spec proxy (type-spec)
174 (declare (ignore type-spec))
175 (translate-type-spec 'pointer))
177 (deftype-method size-of proxy (type-spec)
178 (declare (ignore type-spec))
181 (deftype-method translate-from-alien
182 proxy (type-spec location &optional weak-ref)
183 `(let ((location ,location))
184 (unless (null-pointer-p location)
185 (ensure-proxy-instance ',type-spec location ,weak-ref))))
187 (deftype-method translate-to-alien
188 proxy (type-spec instance &optional weak-ref)
190 `(proxy-location ,instance)
192 (proxy-class-copy (find-class ',type-spec))
193 ',type-spec (proxy-location ,instance))))
195 (deftype-method unreference-alien proxy (type-spec location)
196 `(funcall (proxy-class-free (find-class ',type-spec)) ',type-spec ,location))
198 (defun proxy-instance-size (proxy)
199 (proxy-class-size (class-of proxy)))
201 ;;;; Metaclass used for subclasses of proxy
203 (eval-when (:compile-toplevel :load-toplevel :execute)
204 (defclass proxy-class (virtual-slot-class)
205 ((size :reader proxy-class-size)
206 (copy :reader proxy-class-copy)
207 (free :reader proxy-class-free)))
209 (defclass direct-alien-slot-definition (direct-virtual-slot-definition)
210 ((allocation :initform :alien)
211 (offset :reader slot-definition-offset :initarg :offset)))
213 (defclass effective-alien-slot-definition (effective-virtual-slot-definition)
214 ((offset :reader slot-definition-offset)))
216 (defclass effective-virtual-alien-slot-definition
217 (effective-virtual-slot-definition))
220 (defmethod most-specific-proxy-superclass ((class proxy-class))
223 (subtypep (class-name class) 'proxy))
224 (cdr (pcl::compute-class-precedence-list class))))
226 (defmethod direct-proxy-superclass ((class proxy-class))
229 (subtypep (class-name class) 'proxy))
230 (pcl::class-direct-superclasses class)))
232 (defmethod shared-initialize ((class proxy-class) names
233 &rest initargs &key size copy free)
234 (declare (ignore initargs))
237 (size (setf (slot-value class 'size) (first size)))
238 ((slot-boundp class 'size) (slot-makunbound class 'size)))
240 (copy (setf (slot-value class 'copy) (first copy)))
241 ((slot-boundp class 'copy) (slot-makunbound class 'copy)))
243 (free (setf (slot-value class 'free) (first free)))
244 ((slot-boundp class 'free) (slot-makunbound class 'free))))
246 (defmethod finalize-inheritance ((class proxy-class))
248 (let ((super (most-specific-proxy-superclass class)))
249 (unless (or (not super) (eq super (find-class 'proxy)))
250 (unless (or (slot-boundp class 'copy) (not (slot-boundp super 'copy)))
251 (setf (slot-value class 'copy) (proxy-class-copy super)))
252 (unless (or (slot-boundp class 'free) (not (slot-boundp super 'free)))
253 (setf (slot-value class 'free) (proxy-class-free super))))))
255 (defmethod direct-slot-definition-class ((class proxy-class) initargs)
256 (case (getf initargs :allocation)
257 ((nil :alien) (find-class 'direct-alien-slot-definition))
258 ; (:instance (error "Allocation :instance not allowed in class ~A" class))
259 (t (call-next-method))))
261 (defmethod effective-slot-definition-class ((class proxy-class) initargs)
262 (case (getf initargs :allocation)
263 (:alien (find-class 'effective-alien-slot-definition))
264 (:virtual (find-class 'effective-virtual-alien-slot-definition))
265 (t (call-next-method))))
267 (defmethod compute-virtual-slot-accessors
268 ((class proxy-class) (slotd effective-alien-slot-definition)
270 (with-slots (offset type) slotd
271 (let ((reader (intern-reader-function type))
272 (writer (intern-writer-function type))
273 (destroy (intern-destroy-function type)))
274 (setf offset (slot-definition-offset (first direct-slotds)))
277 (funcall reader (proxy-location object) offset))
278 #'(lambda (value object)
279 (let ((location (proxy-location object)))
280 (funcall destroy location offset)
281 (funcall writer value location offset)))))))
283 (defmethod compute-virtual-slot-accessors
285 (slotd effective-virtual-alien-slot-definition)
287 (destructuring-bind (getter setter) (call-next-method)
288 (let ((class-name (class-name class)))
289 (with-slots (type) slotd
292 (mkbinding getter type class-name)
295 (let ((setter (mkbinding setter 'nil class-name type)))
296 #'(lambda (value object)
297 (funcall setter object value)))
300 (defmethod compute-slots ((class proxy-class))
301 (with-slots (direct-slots size) class
302 (let ((current-offset
303 (proxy-class-size (most-specific-proxy-superclass class)))
305 (dolist (slotd direct-slots)
306 (when (eq (slot-definition-allocation slotd) :alien)
307 (with-slots (offset type) slotd
308 (unless (slot-boundp slotd 'offset)
309 (setf offset current-offset))
310 (setq current-offset (+ offset (size-of type)))
311 (setq max-size (max max-size current-offset)))))
312 (unless (slot-boundp class 'size)
313 (setf size max-size))))
316 (defmethod validate-superclass ((class proxy-class)
317 (super pcl::standard-class))
318 (subtypep (class-name super) 'proxy))
320 (defmethod proxy-class-size (class)
321 (declare (ignore class))
324 (defgeneric make-proxy-instance (class location weak-ref
325 &rest initargs &key)))
327 (defmethod make-proxy-instance ((class symbol) location weak-ref
329 (apply #'make-proxy-instance (find-class class) location weak-ref initargs))
331 (defmethod make-proxy-instance ((class proxy-class) location weak-ref
333 (let ((instance (allocate-instance class)))
336 instance :location location :weak-ref weak-ref initargs)
339 (defun ensure-proxy-instance (class location weak-ref &rest initargs)
341 (find-cached-instance location)
342 (apply #'make-proxy-instance class location weak-ref initargs)))
346 ;;;; Superclasses for wrapping of C structures
348 (eval-when (:compile-toplevel :load-toplevel :execute)
349 (defclass struct (proxy)
351 (:metaclass proxy-class)
353 (:free %free-struct)))
355 (defmethod initialize-instance ((structure struct)
357 (declare (ignore initargs))
359 (slot-value structure 'location)
360 (allocate-memory (proxy-class-size (class-of structure))))
364 (defun %copy-struct (type location)
365 (copy-memory location (proxy-class-size (find-class type))))
367 (defun %free-struct (type location)
368 (declare (ignore type))
369 (deallocate-memory location))
372 ;(eval-when (:compile-toplevel :load-toplevel :execute)
373 (defclass static (struct)
375 (:metaclass proxy-class)
377 (:free %free-static));)
379 (defun %copy-static (type location)
380 (declare (ignore type))
383 (defun %free-static (type location)
384 (declare (ignore type location))