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 1.15 2004-12-16 23:19:17 espen Exp $
22 ;;;; Superclass for all metaclasses implementing some sort of virtual slots
24 (eval-when (:compile-toplevel :load-toplevel :execute)
25 (defclass virtual-slots-class (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)
31 (unbound :reader slot-definition-unbound :initarg :unbound)
32 (boundp :reader slot-definition-boundp :initarg :boundp)))
34 (defclass effective-virtual-slot-definition (standard-effective-slot-definition)
35 ((setter :reader slot-definition-setter :initarg :setter)
36 (getter :reader slot-definition-getter :initarg :getter)
37 (unbound :reader slot-definition-unbound :initarg :unbound)
38 (boundp :reader slot-definition-boundp :initarg :boundp)))
40 (defvar *unbound-marker* (gensym "UNBOUND-MARKER-"))
42 (defun most-specific-slot-value (instances slot &optional
43 (default *unbound-marker*))
44 (let ((object (find-if
46 (and (slot-exists-p ob slot) (slot-boundp ob slot)))
49 (slot-value object slot)
54 (defmethod direct-slot-definition-class ((class virtual-slots-class) &rest initargs)
55 (if (eq (getf initargs :allocation) :virtual)
56 (find-class 'direct-virtual-slot-definition)
59 (defmethod effective-slot-definition-class ((class virtual-slots-class) &rest initargs)
60 (if (eq (getf initargs :allocation) :virtual)
61 (find-class 'effective-virtual-slot-definition)
65 (defmethod initialize-internal-slot-functions ((slotd effective-virtual-slot-definition))
66 (if (not (slot-boundp slotd 'getter))
68 (slot-value slotd 'reader-function)
70 (declare (ignore object))
71 (error "Can't read slot: ~A" (slot-definition-name slotd)))
72 (slot-value slotd 'boundp-function)
73 #'(lambda (object) (declare (ignore object)) nil))
75 (let ((getter-function
76 (let ((getter (slot-value slotd 'getter)))
81 (funcall getter object)))
84 (setf (slot-value slotd 'reader-function)
89 (slot-definition-type slotd) 'pointer)))
90 (funcall reader (proxy-location object))))))))))
93 (slot-value slotd 'boundp-function)
96 (not (slot-boundp slotd 'unbound))
97 (not (slot-boundp slotd 'boundp)))
98 #'(lambda (object) (declare (ignore object)) t))
99 ((slot-boundp slotd 'unbound)
100 (let ((unbound-value (slot-value slotd 'unbound)))
102 (not (eq (funcall getter-function object) unbound-value)))))
103 ((let ((boundp (slot-value slotd 'boundp)))
106 (symbol #'(lambda (object)
107 (funcall boundp object)))
108 (string (let ((reader ()))
113 (slot-definition-type slotd) 'pointer)))
114 (funcall reader (proxy-location object))))))))))
117 (slot-value slotd 'reader-function)
119 ((slot-boundp slotd 'unbound)
120 (let ((unbound (slot-value slotd 'unbound))
121 (slot-name (slot-definition-name slotd)))
123 (let ((value (funcall getter-function object)))
124 (if (eq value unbound)
125 (slot-unbound (class-of object) object slot-name)
127 ((slot-boundp slotd 'boundp)
128 (let ((boundp-function (slot-value slotd 'boundp-function)))
131 (funcall boundp-function object)
132 (funcall getter-function object)))))
133 (getter-function)))))
136 (slot-value slotd 'writer-function)
137 (if (not (slot-boundp slotd 'setter))
139 (declare (ignore object))
140 (error "Can't set slot: ~A" (slot-definition-name slotd)))
141 (with-slots (setter) slotd
145 #'(lambda (value object)
146 (funcall (fdefinition setter) value object)))
150 (slot-value slotd 'writer-function)
151 #'(lambda (value object)
154 (mkbinding setter 'nil 'pointer
155 (slot-definition-type slotd))))
156 (funcall writer (proxy-location object) value)))))))))
158 (initialize-internal-slot-gfs (slot-definition-name slotd)))
162 (defmethod compute-slot-accessor-info ((slotd effective-virtual-slot-definition) type gf)
165 (defmethod compute-effective-slot-definition-initargs ((class virtual-slots-class) direct-slotds)
166 (if (typep (first direct-slotds) 'direct-virtual-slot-definition)
168 (let ((getter (most-specific-slot-value direct-slotds 'getter)))
169 (unless (eq getter *unbound-marker*)
170 (setf (getf initargs :getter) getter)))
171 (let ((setter (most-specific-slot-value direct-slotds 'setter)))
172 (unless (eq setter *unbound-marker*)
173 (setf (getf initargs :setter) setter)))
174 (let ((unbound (most-specific-slot-value direct-slotds 'unbound)))
175 (unless (eq unbound *unbound-marker*)
176 (setf (getf initargs :unbound) unbound)))
177 (let ((boundp (most-specific-slot-value direct-slotds 'boundp)))
178 (unless (eq boundp *unbound-marker*)
179 (setf (getf initargs :boundp) boundp)))
180 (nconc initargs (call-next-method)))
184 (defmethod slot-value-using-class
185 ((class virtual-slots-class) (object standard-object)
186 (slotd effective-virtual-slot-definition))
187 (if (funcall (slot-value slotd 'boundp-function) object)
188 (funcall (slot-value slotd 'reader-function) object)
189 (slot-unbound class object (slot-definition-name slotd))))
191 (defmethod slot-boundp-using-class
192 ((class virtual-slots-class) (object standard-object)
193 (slotd effective-virtual-slot-definition))
194 (funcall (slot-value slotd 'boundp-function) object))
196 (defmethod (setf slot-value-using-class)
197 (value (class virtual-slots-class) (object standard-object)
198 (slotd effective-virtual-slot-definition))
199 (funcall (slot-value slotd 'writer-function) value object))
202 (defmethod validate-superclass
203 ((class virtual-slots-class) (super standard-class))
209 (internal *instance-cache*)
210 (defvar *instance-cache* (make-hash-table :test #'eql))
212 (defun cache-instance (instance)
214 (gethash (system:sap-int (proxy-location instance)) *instance-cache*)
215 (ext:make-weak-pointer instance)))
217 (defun find-cached-instance (location)
218 (let ((ref (gethash (system:sap-int location) *instance-cache*)))
220 (ext:weak-pointer-value ref))))
222 (defun instance-cached-p (location)
223 (gethash (system:sap-int location) *instance-cache*))
225 (defun remove-cached-instance (location)
226 (remhash (system:sap-int location) *instance-cache*))
229 (defun cached-instances ()
230 (let ((instances ()))
231 (maphash #'(lambda (location ref)
232 (declare (ignore location))
233 (push (ext:weak-pointer-value ref) instances))
239 ;;;; Proxy for alien instances
242 ((location :reader proxy-location :type system-area-pointer)))
244 (defgeneric initialize-proxy (object &rest initargs))
245 (defgeneric instance-finalizer (object))
246 (defgeneric reference-foreign (class location))
247 (defgeneric unreference-foreign (class location))
249 (defmethod unreference-foreign :around ((class class) location)
250 (unless (null-pointer-p location)
251 ;; (format t "Unreferencing ~A at ~A" (class-name class) location)
252 ;; (finish-output *standard-output*)
254 ;; (write-line " done")
255 ;; (finish-output *standard-output*)
258 (defmethod print-object ((instance proxy) stream)
259 (print-unreadable-object (instance stream :type t :identity nil)
260 (when (slot-boundp instance 'location)
261 (format stream "at 0x~X" (sap-int (proxy-location instance))))))
263 (defmethod initialize-instance :around ((instance proxy) &key location)
265 (setf (slot-value instance 'location) location)
267 (cache-instance instance)
268 (ext:finalize instance (instance-finalizer instance))
271 (defmethod instance-finalizer ((instance proxy))
272 (let ((location (proxy-location instance))
273 (class (class-of instance)))
274 ;; (unless (find-method #'unreference-foreign nil (list (class-of class) t) nil)
275 ;; (error "No matching method for UNREFERENCE-INSTANCE when called with class ~A" class))
277 (remove-cached-instance location)
278 (unreference-foreign class location))))
281 ;;;; Metaclass used for subclasses of proxy
283 (eval-when (:compile-toplevel :load-toplevel :execute)
284 (defclass proxy-class (virtual-slots-class)
285 ((size :reader proxy-instance-size)))
287 (defclass direct-alien-slot-definition (direct-virtual-slot-definition)
288 ((allocation :initform :alien)
289 (offset :reader slot-definition-offset :initarg :offset)))
291 (defclass effective-alien-slot-definition (effective-virtual-slot-definition)
292 ((offset :reader slot-definition-offset :initarg :offset)))
295 (defmethod most-specific-proxy-superclass ((class proxy-class))
298 (subtypep (class-name class) 'proxy))
299 (cdr (compute-class-precedence-list class))))
301 (defmethod direct-proxy-superclass ((class proxy-class))
304 (subtypep (class-name class) 'proxy))
305 (class-direct-superclasses class)))
307 (defmethod shared-initialize ((class proxy-class) names &key size)
310 (size (setf (slot-value class 'size) (first size)))
311 ((slot-boundp class 'size) (slot-makunbound class 'size))))
313 (defmethod direct-slot-definition-class ((class proxy-class) &rest initargs)
314 (case (getf initargs :allocation)
315 ((nil :alien) (find-class 'direct-alien-slot-definition))
316 (t (call-next-method))))
318 (defmethod effective-slot-definition-class ((class proxy-class) &rest initargs)
319 (case (getf initargs :allocation)
320 (:alien (find-class 'effective-alien-slot-definition))
321 (t (call-next-method))))
324 (defmethod compute-effective-slot-definition-initargs ((class proxy-class) direct-slotds)
325 (if (eq (most-specific-slot-value direct-slotds 'allocation) :alien)
327 (list :offset (most-specific-slot-value direct-slotds 'offset))
332 (defmethod initialize-internal-slot-functions ((slotd effective-alien-slot-definition))
333 (with-slots (offset) slotd
334 (let ((type (slot-definition-type slotd)))
335 (unless (slot-boundp slotd 'getter)
336 (let ((reader (reader-function type)))
338 (slot-value slotd 'getter)
340 (funcall reader (proxy-location object) offset)))))
342 (unless (slot-boundp slotd 'setter)
343 (let ((writer (writer-function type))
344 (destroy (destroy-function type)))
346 (slot-value slotd 'setter)
347 #'(lambda (value object)
348 (let ((location (proxy-location object)))
349 (funcall destroy location offset) ; destroy old value
350 (funcall writer value location offset))))))))
355 ;; TODO: call some C code to detect this a compile time
356 (defconstant +struct-alignmen+ 4)
358 (defmethod compute-slots ((class proxy-class))
360 with offset = (proxy-instance-size (most-specific-proxy-superclass class))
362 for slotd in (class-direct-slots class)
363 when (eq (slot-definition-allocation slotd) :alien)
364 do (if (not (slot-boundp slotd 'offset))
365 (setf (slot-value slotd 'offset) offset)
366 (setq offset (slot-value slotd 'offset)))
368 (incf offset (size-of (slot-definition-type slotd)))
369 (incf offset (mod offset +struct-alignmen+))
370 (setq size (max size offset))
372 finally (unless (slot-boundp class 'size)
373 (setf (slot-value class 'size) size)))
377 (defmethod validate-superclass ((class proxy-class) (super standard-class))
378 (subtypep (class-name super) 'proxy))
380 (defmethod proxy-instance-size (class)
381 (declare (ignore class))
385 (defmethod alien-type ((class proxy-class) &rest args)
386 (declare (ignore class args))
387 (alien-type 'pointer))
389 (defmethod size-of ((class proxy-class) &rest args)
390 (declare (ignore class args))
393 (defmethod from-alien-form (location (class proxy-class) &rest args)
394 (declare (ignore args))
395 `(ensure-proxy-instance ',(class-name class) ,location))
397 (defmethod from-alien-function ((class proxy-class) &rest args)
398 (declare (ignore args))
400 (ensure-proxy-instance class location)))
402 (defmethod to-alien-form (instance (class proxy-class) &rest args)
403 (declare (ignore class args))
404 `(proxy-location ,instance))
406 (defmethod to-alien-function ((class proxy-class) &rest args)
407 (declare (ignore class args))
410 (defmethod copy-from-alien-form (location (class proxy-class) &rest args)
411 (declare (ignore args))
412 (let ((class-name (class-name class)))
413 `(ensure-proxy-instance ',class-name
414 (reference-foreign ',class-name ,location))))
416 (defmethod copy-from-alien-function ((class proxy-class) &rest args)
417 (declare (ignore args))
419 (ensure-proxy-instance class (reference-foreign class location))))
421 (defmethod copy-to-alien-form (instance (class proxy-class) &rest args)
422 (declare (ignore args))
423 `(reference-foreign ',(class-name class) (proxy-location ,instance)))
425 (defmethod copy-to-alien-function ((class proxy-class) &rest args)
426 (declare (ignore class args))
428 (reference-foreign class (proxy-location instance))))
430 (defmethod writer-function ((class proxy-class) &rest args)
431 (declare (ignore args))
432 #'(lambda (instance location &optional (offset 0))
433 (assert (null-pointer-p (sap-ref-sap location offset)))
435 (sap-ref-sap location offset)
436 (reference-foreign class (proxy-location instance)))))
438 (defmethod reader-function ((class proxy-class) &rest args)
439 (declare (ignore args))
440 #'(lambda (location &optional (offset 0))
441 (let ((instance (sap-ref-sap location offset)))
442 (unless (null-pointer-p instance)
443 (ensure-proxy-instance class (reference-foreign class instance))))))
445 (defmethod destroy-function ((class proxy-class) &rest args)
446 (declare (ignore args))
447 #'(lambda (location &optional (offset 0))
448 (unreference-foreign class (sap-ref-sap location offset))))
451 (defgeneric ensure-proxy-instance (class location)
452 (:documentation "Returns a proxy object representing the foreign object at the give location."))
454 (defmethod ensure-proxy-instance :around (class location)
455 (unless (null-pointer-p location)
457 (find-cached-instance location)
458 (call-next-method))))
460 (defmethod ensure-proxy-instance ((class symbol) location)
461 (ensure-proxy-instance (find-class class) location))
463 (defmethod ensure-proxy-instance ((class proxy-class) location)
464 (make-instance class :location location))
467 ;;;; Superclasses for wrapping of C structures
469 (defclass struct (proxy)
471 (:metaclass proxy-class))
473 (defmethod initialize-instance ((struct struct) &rest initargs)
474 (declare (ignore initargs))
475 (unless (slot-boundp struct 'location)
476 (let ((size (proxy-instance-size (class-of struct))))
478 (error "~A has zero size" (class-of struct))
479 (setf (slot-value struct 'location) (allocate-memory size)))))
483 ;;;; Metaclasses used for subclasses of struct
485 (defclass struct-class (proxy-class)
488 (defmethod reference-foreign ((class struct-class) location)
489 (copy-memory location (proxy-instance-size class)))
491 (defmethod unreference-foreign ((class struct-class) location)
492 (deallocate-memory location))
495 (defclass static-struct-class (struct-class)
498 (defmethod reference-foreign ((class static-struct-class) location)
499 (declare (ignore class))
502 (defmethod unreference-foreign ((class static-struct-class) location)
503 (declare (ignore class location))