/[cmucl]/src/pcl/std-class.lisp
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Contents of /src/pcl/std-class.lisp

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Revision 1.20 - (hide annotations)
Wed Jan 6 14:30:07 1999 UTC (15 years, 3 months ago) by pw
Branch: MAIN
Changes since 1.19: +3 -2 lines
Backout previous change to ensure-class-values. There is more to
this bug than previously thought.
1 wlott 1.1 ;;;-*-Mode:LISP; Package:PCL; Base:10; Syntax:Common-lisp -*-
2     ;;;
3     ;;; *************************************************************************
4     ;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
5     ;;; All rights reserved.
6     ;;;
7     ;;; Use and copying of this software and preparation of derivative works
8     ;;; based upon this software are permitted. Any distribution of this
9     ;;; software or derivative works must comply with all applicable United
10     ;;; States export control laws.
11     ;;;
12     ;;; This software is made available AS IS, and Xerox Corporation makes no
13     ;;; warranty about the software, its performance or its conformity to any
14     ;;; specification.
15     ;;;
16     ;;; Any person obtaining a copy of this software is requested to send their
17     ;;; name and post office or electronic mail address to:
18     ;;; CommonLoops Coordinator
19     ;;; Xerox PARC
20     ;;; 3333 Coyote Hill Rd.
21     ;;; Palo Alto, CA 94304
22     ;;; (or send Arpanet mail to CommonLoops-Coordinator.pa@Xerox.arpa)
23     ;;;
24     ;;; Suggestions, comments and requests for improvements are also welcome.
25     ;;; *************************************************************************
26     ;;;
27 dtc 1.18 #+cmu
28     (ext:file-comment
29 pw 1.20 "$Header: /tiger/var/lib/cvsroots/cmucl/src/pcl/std-class.lisp,v 1.20 1999/01/06 14:30:07 pw Exp $")
30 dtc 1.18 ;;;
31 wlott 1.1
32 phg 1.7 (in-package :pcl)
33 wlott 1.1
34 ram 1.4 (defmethod slot-accessor-function ((slotd effective-slot-definition) type)
35     (ecase type
36     (reader (slot-definition-reader-function slotd))
37     (writer (slot-definition-writer-function slotd))
38     (boundp (slot-definition-boundp-function slotd))))
39 wlott 1.1
40 ram 1.6 (defmethod (setf slot-accessor-function) (function
41     (slotd effective-slot-definition) type)
42 ram 1.4 (ecase type
43 ram 1.6 (reader (setf (slot-definition-reader-function slotd) function))
44     (writer (setf (slot-definition-writer-function slotd) function))
45 ram 1.4 (boundp (setf (slot-definition-boundp-function slotd) function))))
46    
47     (defconstant *slotd-reader-function-std-p* 1)
48     (defconstant *slotd-writer-function-std-p* 2)
49     (defconstant *slotd-boundp-function-std-p* 4)
50 ram 1.6 (defconstant *slotd-all-function-std-p* 7)
51 ram 1.4
52     (defmethod slot-accessor-std-p ((slotd effective-slot-definition) type)
53     (let ((flags (slot-value slotd 'accessor-flags)))
54 ram 1.6 (declare (type fixnum flags))
55 ram 1.4 (if (eq type 'all)
56 ram 1.6 (eql *slotd-all-function-std-p* flags)
57 ram 1.4 (let ((mask (ecase type
58     (reader *slotd-reader-function-std-p*)
59     (writer *slotd-writer-function-std-p*)
60     (boundp *slotd-boundp-function-std-p*))))
61 ram 1.6 (declare (type fixnum mask))
62     (not (zerop (the fixnum (logand mask flags))))))))
63 ram 1.4
64     (defmethod (setf slot-accessor-std-p) (value (slotd effective-slot-definition) type)
65     (let ((mask (ecase type
66     (reader *slotd-reader-function-std-p*)
67     (writer *slotd-writer-function-std-p*)
68     (boundp *slotd-boundp-function-std-p*)))
69     (flags (slot-value slotd 'accessor-flags)))
70 ram 1.6 (declare (type fixnum mask flags))
71 ram 1.4 (setf (slot-value slotd 'accessor-flags)
72     (if value
73 ram 1.6 (the fixnum (logior mask flags))
74     (the fixnum (logand (the fixnum (lognot mask)) flags)))))
75 ram 1.4 value)
76    
77     (defmethod initialize-internal-slot-functions ((slotd effective-slot-definition))
78     (let* ((name (slot-value slotd 'name))
79 ram 1.6 (class (slot-value slotd 'class)))
80 ram 1.4 (let ((table (or (gethash name *name->class->slotd-table*)
81     (setf (gethash name *name->class->slotd-table*)
82     (make-hash-table :test 'eq :size 5)))))
83     (setf (gethash class table) slotd))
84     (dolist (type '(reader writer boundp))
85 ram 1.6 (let* ((gf-name (ecase type
86     (reader 'slot-value-using-class)
87     (writer '(setf slot-value-using-class))
88     (boundp 'slot-boundp-using-class)))
89     (gf (gdefinition gf-name)))
90     (compute-slot-accessor-info slotd type gf)))
91     (initialize-internal-slot-gfs name)))
92 ram 1.4
93 ram 1.6 (defmethod compute-slot-accessor-info ((slotd effective-slot-definition) type gf)
94     (let* ((name (slot-value slotd 'name))
95     (class (slot-value slotd 'class))
96     (old-slotd (find-slot-definition class name))
97     (old-std-p (and old-slotd (slot-accessor-std-p old-slotd 'all))))
98     (multiple-value-bind (function std-p)
99     (if (eq *boot-state* 'complete)
100     (get-accessor-method-function gf type class slotd)
101     (get-optimized-std-accessor-method-function class slotd type))
102     #+kcl (si:turbo-closure function)
103     (setf (slot-accessor-std-p slotd type) std-p)
104     (setf (slot-accessor-function slotd type) function))
105     (when (and old-slotd (not (eq old-std-p (slot-accessor-std-p slotd 'all))))
106     (push (cons class name) *pv-table-cache-update-info*))))
107 ram 1.5
108 ram 1.6 (defmethod slot-definition-allocation ((slotd structure-slot-definition))
109     :instance)
110 ram 1.5
111 ram 1.6
112 ram 1.5
113 ram 1.6 (defmethod shared-initialize :after ((object documentation-mixin)
114     slot-names
115     &key (documentation nil documentation-p))
116     (declare (ignore slot-names))
117     (when documentation-p
118     (setf (plist-value object 'documentation) documentation)))
119 ram 1.5
120 dtc 1.11 (defmethod documentation (object doc-type)
121 dtc 1.10 (declare (ignore object doc-type))
122     nil)
123 wlott 1.1
124 dtc 1.11 (defmethod (setf documentation) (new-value object doc-type)
125 wlott 1.1 (declare (ignore new-value doc-type))
126     (error "Can't change the documentation of ~S." object))
127    
128 dtc 1.11 (defmethod documentation ((object documentation-mixin) doc-type)
129 ram 1.6 (declare (ignore doc-type))
130     (plist-value object 'documentation))
131 wlott 1.1
132 dtc 1.11 (defmethod (setf documentation) (new-value (object documentation-mixin) doc-type)
133 ram 1.6 (declare (ignore doc-type))
134     (setf (plist-value object 'documentation) new-value))
135 wlott 1.1
136    
137 dtc 1.11 (defmethod documentation ((slotd standard-slot-definition) doc-type)
138 ram 1.6 (declare (ignore doc-type))
139     (slot-value slotd 'documentation))
140 wlott 1.1
141 dtc 1.11 (defmethod (setf documentation) (new-value (slotd standard-slot-definition) doc-type)
142 ram 1.6 (declare (ignore doc-type))
143     (setf (slot-value slotd 'documentation) new-value))
144 wlott 1.1
145    
146     ;;;
147     ;;; Various class accessors that are a little more complicated than can be
148     ;;; done with automatically generated reader methods.
149     ;;;
150 ram 1.6 (defmethod class-finalized-p ((class pcl-class))
151     (with-slots (wrapper) class
152     (not (null wrapper))))
153 wlott 1.1
154     (defmethod class-prototype ((class std-class))
155     (with-slots (prototype) class
156 ram 1.6 (or prototype (setq prototype (allocate-instance class)))))
157 wlott 1.1
158 ram 1.6 (defmethod class-prototype ((class structure-class))
159     (with-slots (prototype wrapper defstruct-constructor) class
160     (or prototype
161     (setq prototype
162     (if #-new-kcl-wrapper defstruct-constructor #+new-kcl-wrapper nil
163     (allocate-instance class)
164     (allocate-standard-instance wrapper))))))
165 ram 1.4
166 ram 1.6 (defmethod class-direct-default-initargs ((class slot-class))
167     (plist-value class 'direct-default-initargs))
168    
169     (defmethod class-default-initargs ((class slot-class))
170     (plist-value class 'default-initargs))
171    
172 ram 1.4 (defmethod class-constructors ((class slot-class))
173 wlott 1.1 (plist-value class 'constructors))
174    
175     (defmethod class-slot-cells ((class std-class))
176     (plist-value class 'class-slot-cells))
177    
178    
179     ;;;
180     ;;; Class accessors that are even a little bit more complicated than those
181     ;;; above. These have a protocol for updating them, we must implement that
182     ;;; protocol.
183     ;;;
184    
185     ;;;
186     ;;; Maintaining the direct subclasses backpointers. The update methods are
187     ;;; here, the values are read by an automatically generated reader method.
188     ;;;
189     (defmethod add-direct-subclass ((class class) (subclass class))
190     (with-slots (direct-subclasses) class
191     (pushnew subclass direct-subclasses)
192     subclass))
193    
194     (defmethod remove-direct-subclass ((class class) (subclass class))
195     (with-slots (direct-subclasses) class
196     (setq direct-subclasses (remove subclass direct-subclasses))
197     subclass))
198    
199     ;;;
200     ;;; Maintaining the direct-methods and direct-generic-functions backpointers.
201     ;;;
202     ;;; There are four generic functions involved, each has one method for the
203     ;;; class case and another method for the damned EQL specializers. All of
204     ;;; these are specified methods and appear in their specified place in the
205     ;;; class graph.
206     ;;;
207 ram 1.4 ;;; ADD-DIRECT-METHOD
208     ;;; REMOVE-DIRECT-METHOD
209     ;;; SPECIALIZER-DIRECT-METHODS
210     ;;; SPECIALIZER-DIRECT-GENERIC-FUNCTIONS
211 wlott 1.1 ;;;
212     ;;; In each case, we maintain one value which is a cons. The car is the list
213     ;;; methods. The cdr is a list of the generic functions. The cdr is always
214     ;;; computed lazily.
215     ;;;
216    
217 ram 1.4 (defmethod add-direct-method ((specializer class) (method method))
218 wlott 1.1 (with-slots (direct-methods) specializer
219     (setf (car direct-methods) (adjoin method (car direct-methods)) ;PUSH
220     (cdr direct-methods) ()))
221     method)
222    
223 ram 1.4 (defmethod remove-direct-method ((specializer class) (method method))
224 wlott 1.1 (with-slots (direct-methods) specializer
225     (setf (car direct-methods) (remove method (car direct-methods))
226     (cdr direct-methods) ()))
227     method)
228    
229 ram 1.4 (defmethod specializer-direct-methods ((specializer class))
230 wlott 1.1 (with-slots (direct-methods) specializer
231     (car direct-methods)))
232    
233 ram 1.4 (defmethod specializer-direct-generic-functions ((specializer class))
234 wlott 1.1 (with-slots (direct-methods) specializer
235     (or (cdr direct-methods)
236     (setf (cdr direct-methods)
237     (gathering1 (collecting-once)
238     (dolist (m (car direct-methods))
239     (gather1 (method-generic-function m))))))))
240    
241    
242    
243     ;;;
244     ;;; This hash table is used to store the direct methods and direct generic
245     ;;; functions of EQL specializers. Each value in the table is the cons.
246     ;;;
247 ram 1.4 (defvar *eql-specializer-methods* (make-hash-table :test #'eql))
248     (defvar *class-eq-specializer-methods* (make-hash-table :test #'eq))
249 wlott 1.1
250 ram 1.4 (defmethod specializer-method-table ((specializer eql-specializer))
251     *eql-specializer-methods*)
252    
253     (defmethod specializer-method-table ((specializer class-eq-specializer))
254     *class-eq-specializer-methods*)
255    
256     (defmethod add-direct-method ((specializer specializer-with-object) (method method))
257 ram 1.2 (let* ((object (specializer-object specializer))
258 ram 1.4 (table (specializer-method-table specializer))
259     (entry (gethash object table)))
260 wlott 1.1 (unless entry
261     (setq entry
262 ram 1.4 (setf (gethash object table)
263 wlott 1.1 (cons nil nil))))
264     (setf (car entry) (adjoin method (car entry))
265     (cdr entry) ())
266     method))
267    
268 ram 1.4 (defmethod remove-direct-method ((specializer specializer-with-object) (method method))
269 ram 1.2 (let* ((object (specializer-object specializer))
270 ram 1.4 (entry (gethash object (specializer-method-table specializer))))
271 wlott 1.1 (when entry
272     (setf (car entry) (remove method (car entry))
273     (cdr entry) ()))
274     method))
275    
276 ram 1.4 (defmethod specializer-direct-methods ((specializer specializer-with-object))
277     (car (gethash (specializer-object specializer)
278     (specializer-method-table specializer))))
279 wlott 1.1
280 ram 1.4 (defmethod specializer-direct-generic-functions ((specializer specializer-with-object))
281 ram 1.2 (let* ((object (specializer-object specializer))
282 ram 1.4 (entry (gethash object (specializer-method-table specializer))))
283 wlott 1.1 (when entry
284     (or (cdr entry)
285     (setf (cdr entry)
286     (gathering1 (collecting-once)
287     (dolist (m (car entry))
288     (gather1 (method-generic-function m)))))))))
289    
290 ram 1.4 (defun map-specializers (function)
291     (map-all-classes #'(lambda (class)
292     (funcall function (class-eq-specializer class))
293     (funcall function class)))
294     (maphash #'(lambda (object methods)
295     (declare (ignore methods))
296     (intern-eql-specializer object))
297     *eql-specializer-methods*)
298     (maphash #'(lambda (object specl)
299     (declare (ignore object))
300     (funcall function specl))
301     *eql-specializer-table*)
302     nil)
303    
304     (defun map-all-generic-functions (function)
305     (let ((all-generic-functions (make-hash-table :test 'eq)))
306     (map-specializers #'(lambda (specl)
307     (dolist (gf (specializer-direct-generic-functions specl))
308     (unless (gethash gf all-generic-functions)
309     (setf (gethash gf all-generic-functions) t)
310     (funcall function gf))))))
311     nil)
312    
313     (defmethod shared-initialize :after ((specl class-eq-specializer) slot-names &key)
314     (declare (ignore slot-names))
315     (setf (slot-value specl 'type) `(class-eq ,(specializer-class specl))))
316    
317     (defmethod shared-initialize :after ((specl eql-specializer) slot-names &key)
318     (declare (ignore slot-names))
319     (setf (slot-value specl 'type) `(eql ,(specializer-object specl))))
320    
321 wlott 1.1
322    
323     (defun real-load-defclass (name metaclass-name supers slots other accessors)
324     (do-standard-defsetfs-for-defclass accessors) ;***
325 pw 1.9 (let ((res (apply #'ensure-class name :metaclass metaclass-name
326     :direct-superclasses supers
327     :direct-slots slots
328     :definition-source `((defclass ,name)
329     ,(load-truename))
330     other)))
331 pw 1.12 ;; Defclass of a class with a forward-referenced superclass does not
332     ;; have a wrapper. RES is the incomplete PCL class. The Lisp class
333     ;; does not yet exist. Maybe should return NIL in that case as RES
334     ;; is not useful to the user?
335     #+cmu17 (and (class-wrapper res)(kernel:layout-class (class-wrapper res)))
336 pw 1.9 #-cmu17 res))
337 wlott 1.1
338 phg 1.7 (setf (gdefinition 'load-defclass) #'real-load-defclass)
339 ram 1.6
340     (defun ensure-class (name &rest all)
341     (apply #'ensure-class-using-class name (find-class name nil) all))
342    
343     (defmethod ensure-class-using-class (name (class null) &rest args &key)
344     (multiple-value-bind (meta initargs)
345     (ensure-class-values class args)
346     (inform-type-system-about-class (class-prototype meta) name);***
347     (setf class (apply #'make-instance meta :name name initargs)
348 phg 1.7 (find-class name) class)
349 ram 1.6 (inform-type-system-about-class class name) ;***
350     class))
351    
352     (defmethod ensure-class-using-class (name (class pcl-class) &rest args &key)
353     (multiple-value-bind (meta initargs)
354     (ensure-class-values class args)
355     (unless (eq (class-of class) meta) (change-class class meta))
356     (apply #'reinitialize-instance class initargs)
357 phg 1.7 (setf (find-class name) class)
358 ram 1.6 (inform-type-system-about-class class name) ;***
359     class))
360    
361 phg 1.7 (defmethod class-predicate-name ((class t))
362     'function-returning-nil)
363    
364 wlott 1.1 (defun ensure-class-values (class args)
365     (let* ((initargs (copy-list args))
366     (unsupplied (list 1))
367     (supplied-meta (getf initargs :metaclass unsupplied))
368     (supplied-supers (getf initargs :direct-superclasses unsupplied))
369     (supplied-slots (getf initargs :direct-slots unsupplied))
370     (meta
371     (cond ((neq supplied-meta unsupplied)
372     (find-class supplied-meta))
373     ((or (null class)
374     (forward-referenced-class-p class))
375     *the-class-standard-class*)
376     (t
377 ram 1.4 (class-of class)))))
378 wlott 1.1 (flet ((fix-super (s)
379     (cond ((classp s) s)
380     ((not (legal-class-name-p s))
381     (error "~S is not a class or a legal class name." s))
382 pw 1.20 #||notyet #+cmu17
383 pw 1.19 ((eq s 'lisp:standard-class) ; map from lisp to pcl
384     *the-class-standard-class*)
385 pw 1.20 ||#
386 wlott 1.1 (t
387     (or (find-class s nil)
388     (setf (find-class s)
389     (make-instance 'forward-referenced-class
390     :name s)))))))
391     (loop (unless (remf initargs :metaclass) (return)))
392     (loop (unless (remf initargs :direct-superclasses) (return)))
393     (loop (unless (remf initargs :direct-slots) (return)))
394     (values meta
395     (list* :direct-superclasses
396     (and (neq supplied-supers unsupplied)
397     (mapcar #'fix-super supplied-supers))
398     :direct-slots
399     (and (neq supplied-slots unsupplied) supplied-slots)
400     initargs)))))
401    
402    
403     ;;;
404     ;;;
405     ;;;
406 ram 1.6 #|| ; since it doesn't do anything
407 wlott 1.1 (defmethod shared-initialize :before ((class std-class)
408     slot-names
409 ram 1.6 &key direct-superclasses)
410 wlott 1.1 (declare (ignore slot-names))
411 ram 1.6 ;; *** error checking
412     )
413     ||#
414    
415 wlott 1.1 (defmethod shared-initialize :after
416     ((class std-class)
417     slot-names
418 ram 1.2 &key (direct-superclasses nil direct-superclasses-p)
419     (direct-slots nil direct-slots-p)
420 ram 1.4 (direct-default-initargs nil direct-default-initargs-p)
421     (predicate-name nil predicate-name-p))
422 wlott 1.1 (declare (ignore slot-names))
423 dtc 1.17 (cond (direct-superclasses-p
424     (setq direct-superclasses
425     (or direct-superclasses
426     (list (if (funcallable-standard-class-p class)
427     *the-class-funcallable-standard-object*
428     *the-class-standard-object*))))
429     (dolist (superclass direct-superclasses)
430     (unless (validate-superclass class superclass)
431     (error "The class ~S was specified as a~%
432     super-class of the class ~S;~%~
433     but the meta-classes ~S and~%~S are incompatible.~@
434     Define a method for ~S to avoid this error."
435     superclass class (class-of superclass) (class-of class)
436     'validate-superclass)))
437     (setf (slot-value class 'direct-superclasses) direct-superclasses))
438     (t
439     (setq direct-superclasses (slot-value class 'direct-superclasses))))
440 ram 1.2 (setq direct-slots
441     (if direct-slots-p
442     (setf (slot-value class 'direct-slots)
443 ram 1.6 (mapcar #'(lambda (pl) (make-direct-slotd class pl)) direct-slots))
444 ram 1.2 (slot-value class 'direct-slots)))
445     (if direct-default-initargs-p
446 ram 1.6 (setf (plist-value class 'direct-default-initargs) direct-default-initargs)
447     (setq direct-default-initargs (plist-value class 'direct-default-initargs)))
448 wlott 1.1 (setf (plist-value class 'class-slot-cells)
449     (gathering1 (collecting)
450     (dolist (dslotd direct-slots)
451 ram 1.4 (when (eq (slot-definition-allocation dslotd) class)
452     (let ((initfunction (slot-definition-initfunction dslotd)))
453     (gather1 (cons (slot-definition-name dslotd)
454     (if initfunction
455 ram 1.6 (funcall initfunction)
456 ram 1.4 *slot-unbound*))))))))
457 ram 1.6 (setq predicate-name (if predicate-name-p
458     (setf (slot-value class 'predicate-name)
459     (car predicate-name))
460     (or (slot-value class 'predicate-name)
461     (setf (slot-value class 'predicate-name)
462     (make-class-predicate-name (class-name class))))))
463 wlott 1.1 (add-direct-subclasses class direct-superclasses)
464 ram 1.6 (update-class class nil)
465     (make-class-predicate class predicate-name)
466     (add-slot-accessors class direct-slots))
467 wlott 1.1
468 ram 1.6 (defmethod shared-initialize :before ((class class) slot-names &key name)
469     (declare (ignore slot-names name))
470 ram 1.4 (setf (slot-value class 'type) `(class ,class))
471     (setf (slot-value class 'class-eq-specializer)
472     (make-instance 'class-eq-specializer :class class)))
473    
474     (defmethod reinitialize-instance :before ((class slot-class) &key)
475 ram 1.2 (remove-direct-subclasses class (class-direct-superclasses class))
476 wlott 1.1 (remove-slot-accessors class (class-direct-slots class)))
477    
478 ram 1.6 (defmethod reinitialize-instance :after ((class slot-class)
479 wlott 1.1 &rest initargs
480     &key)
481     (map-dependents class
482     #'(lambda (dependent)
483     (apply #'update-dependent class dependent initargs))))
484 ram 1.4
485 ram 1.6 (defmethod shared-initialize :after
486     ((class structure-class)
487     slot-names
488     &key (direct-superclasses nil direct-superclasses-p)
489     (direct-slots nil direct-slots-p)
490     direct-default-initargs
491     (predicate-name nil predicate-name-p))
492     (declare (ignore slot-names direct-default-initargs))
493     (if direct-superclasses-p
494     (setf (slot-value class 'direct-superclasses)
495     (or direct-superclasses
496     (setq direct-superclasses
497     (and (not (eq (class-name class) 'structure-object))
498     (list *the-class-structure-object*)))))
499     (setq direct-superclasses (slot-value class 'direct-superclasses)))
500     (let* ((name (class-name class))
501     (from-defclass-p (slot-value class 'from-defclass-p))
502     (defstruct-p (or from-defclass-p (not (structure-type-p name)))))
503     (if direct-slots-p
504     (setf (slot-value class 'direct-slots)
505     (setq direct-slots
506     (mapcar #'(lambda (pl)
507     (when defstruct-p
508     (let* ((slot-name (getf pl :name))
509     (acc-name (format nil "~s structure class ~a"
510     name slot-name))
511     (accessor (intern acc-name)))
512     (setq pl (list* :defstruct-accessor-symbol accessor
513     pl))))
514     (make-direct-slotd class pl))
515     direct-slots)))
516     (setq direct-slots (slot-value class 'direct-slots)))
517     (when defstruct-p
518     (let* ((include (car (slot-value class 'direct-superclasses)))
519     (conc-name (intern (format nil "~s structure class " name)))
520     (constructor (intern (format nil "~a constructor" conc-name)))
521     (defstruct `(defstruct (,name
522     ,@(when include
523     `((:include ,(class-name include))))
524     (:print-function print-std-instance)
525     (:predicate nil)
526     (:conc-name ,conc-name)
527     (:constructor ,constructor ()))
528     ,@(mapcar #'(lambda (slot)
529     `(,(slot-definition-name slot)
530     *slot-unbound*))
531     direct-slots)))
532     (reader-names (mapcar #'(lambda (slotd)
533     (intern (format nil "~A~A reader" conc-name
534     (slot-definition-name slotd))))
535     direct-slots))
536     (writer-names (mapcar #'(lambda (slotd)
537     (intern (format nil "~A~A writer" conc-name
538     (slot-definition-name slotd))))
539     direct-slots))
540     (readers-init
541     (mapcar #'(lambda (slotd reader-name)
542     (let ((accessor
543     (slot-definition-defstruct-accessor-symbol slotd)))
544     `(defun ,reader-name (obj)
545     (declare (type ,name obj))
546     (,accessor obj))))
547     direct-slots reader-names))
548     (writers-init
549     (mapcar #'(lambda (slotd writer-name)
550     (let ((accessor
551     (slot-definition-defstruct-accessor-symbol slotd)))
552     `(defun ,writer-name (nv obj)
553     (declare (type ,name obj))
554     (setf (,accessor obj) nv))))
555     direct-slots writer-names))
556     (defstruct-form
557     `(progn
558     ,defstruct
559     ,@readers-init ,@writers-init
560     (declare-structure ',name nil nil))))
561     (unless (structure-type-p name) (eval defstruct-form))
562     (mapc #'(lambda (dslotd reader-name writer-name)
563     (let* ((reader (gdefinition reader-name))
564     (writer (when (gboundp writer-name)
565     (gdefinition writer-name))))
566     (setf (slot-value dslotd 'internal-reader-function) reader)
567     (setf (slot-value dslotd 'internal-writer-function) writer)))
568     direct-slots reader-names writer-names)
569     (setf (slot-value class 'defstruct-form) defstruct-form)
570     (setf (slot-value class 'defstruct-constructor) constructor))))
571     (add-direct-subclasses class direct-superclasses)
572     (setf (slot-value class 'class-precedence-list)
573     (compute-class-precedence-list class))
574     (setf (slot-value class 'slots) (compute-slots class))
575 pw 1.9 #-(or cmu17 new-kcl-wrapper)
576 ram 1.6 (unless (slot-value class 'wrapper)
577     (setf (slot-value class 'wrapper) (make-wrapper 0 class)))
578 pw 1.9 #+cmu17
579     (let ((lclass (lisp:find-class (class-name class))))
580     (setf (kernel:class-pcl-class lclass) class)
581     (setf (slot-value class 'wrapper) (kernel:class-layout lclass)))
582 ram 1.6 #+new-kcl-wrapper
583     (let ((wrapper (get (class-name class) 'si::s-data)))
584     (setf (slot-value class 'wrapper) wrapper)
585     (setf (wrapper-class wrapper) class))
586     (update-pv-table-cache-info class)
587     (setq predicate-name (if predicate-name-p
588     (setf (slot-value class 'predicate-name)
589     (car predicate-name))
590     (or (slot-value class 'predicate-name)
591     (setf (slot-value class 'predicate-name)
592     (make-class-predicate-name (class-name class))))))
593     (make-class-predicate class predicate-name)
594     (add-slot-accessors class direct-slots))
595 ram 1.4
596 ram 1.6 (defmethod direct-slot-definition-class ((class structure-class) initargs)
597     (declare (ignore initargs))
598     (find-class 'structure-direct-slot-definition))
599    
600     (defmethod finalize-inheritance ((class structure-class))
601     nil) ; always finalized
602 wlott 1.1
603     (defun add-slot-accessors (class dslotds)
604     (fix-slot-accessors class dslotds 'add))
605    
606     (defun remove-slot-accessors (class dslotds)
607     (fix-slot-accessors class dslotds 'remove))
608    
609     (defun fix-slot-accessors (class dslotds add/remove)
610 ram 1.6 (flet ((fix (gfspec name r/w)
611 wlott 1.1 (let ((gf (ensure-generic-function gfspec)))
612     (case r/w
613     (r (if (eq add/remove 'add)
614 ram 1.6 (add-reader-method class gf name)
615 wlott 1.1 (remove-reader-method class gf)))
616     (w (if (eq add/remove 'add)
617 ram 1.6 (add-writer-method class gf name)
618 wlott 1.1 (remove-writer-method class gf)))))))
619     (dolist (dslotd dslotds)
620 ram 1.6 (let ((slot-name (slot-definition-name dslotd)))
621     (dolist (r (slot-definition-readers dslotd)) (fix r slot-name 'r))
622     (dolist (w (slot-definition-writers dslotd)) (fix w slot-name 'w))))))
623 wlott 1.1
624    
625     (defun add-direct-subclasses (class new)
626     (dolist (n new)
627     (unless (memq class (class-direct-subclasses class))
628     (add-direct-subclass n class))))
629    
630     (defun remove-direct-subclasses (class new)
631     (let ((old (class-direct-superclasses class)))
632     (dolist (o (set-difference old new))
633     (remove-direct-subclass o class))))
634    
635    
636     ;;;
637     ;;;
638     ;;;
639     (defmethod finalize-inheritance ((class std-class))
640     (update-class class t))
641    
642    
643 ram 1.6 (defun class-has-a-forward-referenced-superclass-p (class)
644     (or (forward-referenced-class-p class)
645     (some #'class-has-a-forward-referenced-superclass-p
646     (class-direct-superclasses class))))
647 ram 1.4
648 wlott 1.1 ;;;
649 ram 1.4 ;;; Called by :after shared-initialize whenever a class is initialized or
650     ;;; reinitialized. The class may or may not be finalized.
651 wlott 1.1 ;;;
652     (defun update-class (class finalizep)
653 ram 1.6 (when (or finalizep (class-finalized-p class)
654     (not (class-has-a-forward-referenced-superclass-p class)))
655 ram 1.4 (update-cpl class (compute-class-precedence-list class))
656 ram 1.6 (update-slots class (compute-slots class))
657 ram 1.4 (update-gfs-of-class class)
658     (update-inits class (compute-default-initargs class))
659 phg 1.7 (update-make-instance-function-table class))
660 wlott 1.1 (unless finalizep
661     (dolist (sub (class-direct-subclasses class)) (update-class sub nil))))
662    
663     (defun update-cpl (class cpl)
664 dtc 1.13 (if (class-finalized-p class)
665     (unless (equal (class-precedence-list class) cpl)
666     ;; Need to have the cpl setup before update-lisp-class-layout
667     ;; is called on CMUCL.
668     (setf (slot-value class 'class-precedence-list) cpl)
669     (force-cache-flushes class))
670     (setf (slot-value class 'class-precedence-list) cpl))
671 ram 1.4 (update-class-can-precede-p cpl))
672 wlott 1.1
673 ram 1.4 (defun update-class-can-precede-p (cpl)
674     (when cpl
675 ram 1.6 (let ((first (car cpl)))
676 ram 1.4 (dolist (c (cdr cpl))
677 ram 1.6 (pushnew c (slot-value first 'can-precede-list))))
678 ram 1.4 (update-class-can-precede-p (cdr cpl))))
679    
680     (defun class-can-precede-p (class1 class2)
681 ram 1.6 (member class2 (class-can-precede-list class1)))
682 ram 1.4
683 ram 1.6 (defun update-slots (class eslotds)
684 ram 1.4 (let ((instance-slots ())
685     (class-slots ()))
686     (dolist (eslotd eslotds)
687     (let ((alloc (slot-definition-allocation eslotd)))
688     (cond ((eq alloc :instance) (push eslotd instance-slots))
689     ((classp alloc) (push eslotd class-slots)))))
690 ram 1.6 ;;
691     ;; If there is a change in the shape of the instances then the
692     ;; old class is now obsolete.
693     ;;
694     (let* ((nlayout (mapcar #'slot-definition-name
695     (sort instance-slots #'< :key #'slot-definition-location)))
696     (nslots (length nlayout))
697     (nwrapper-class-slots (compute-class-slots class-slots))
698     (owrapper (class-wrapper class))
699     (olayout (and owrapper (wrapper-instance-slots-layout owrapper)))
700     (owrapper-class-slots (and owrapper (wrapper-class-slots owrapper)))
701     (nwrapper
702     (cond ((null owrapper)
703     (make-wrapper nslots class))
704     ((and (equal nlayout olayout)
705     (not
706     (iterate ((o (list-elements owrapper-class-slots))
707     (n (list-elements nwrapper-class-slots)))
708     (unless (eq (car o) (car n)) (return t)))))
709     owrapper)
710     (t
711     ;;
712     ;; This will initialize the new wrapper to have the same
713     ;; state as the old wrapper. We will then have to change
714     ;; that. This may seem like wasted work (it is), but the
715     ;; spec requires that we call make-instances-obsolete.
716     ;;
717     (make-instances-obsolete class)
718     (class-wrapper class)))))
719 pw 1.9
720 ram 1.6 (with-slots (wrapper slots) class
721     #+new-kcl-wrapper
722     (setf (si::s-data-name nwrapper) (class-name class))
723 pw 1.9 #+cmu17
724     (update-lisp-class-layout class nwrapper)
725 ram 1.6 (setf slots eslotds
726     (wrapper-instance-slots-layout nwrapper) nlayout
727     (wrapper-class-slots nwrapper) nwrapper-class-slots
728     (wrapper-no-of-instance-slots nwrapper) nslots
729     wrapper nwrapper))
730 pw 1.9
731 ram 1.6 (unless (eq owrapper nwrapper)
732     (update-pv-table-cache-info class)))))
733 wlott 1.1
734 ram 1.6 (defun compute-class-slots (eslotds)
735 ram 1.4 (gathering1 (collecting)
736 wlott 1.1 (dolist (eslotd eslotds)
737 ram 1.4 (gather1
738 ram 1.6 (assoc (slot-definition-name eslotd)
739     (class-slot-cells (slot-definition-allocation eslotd)))))))
740 wlott 1.1
741 ram 1.6 (defun compute-layout (cpl instance-eslotds)
742 wlott 1.1 (let* ((names
743     (gathering1 (collecting)
744     (dolist (eslotd instance-eslotds)
745 ram 1.6 (when (eq (slot-definition-allocation eslotd) :instance)
746     (gather1 (slot-definition-name eslotd))))))
747 wlott 1.1 (order ()))
748     (labels ((rwalk (tail)
749     (when tail
750     (rwalk (cdr tail))
751 ram 1.6 (dolist (ss (class-slots (car tail)))
752 ram 1.4 (let ((n (slot-definition-name ss)))
753 ram 1.6 (when (member n names)
754 wlott 1.1 (setq order (cons n order)
755     names (remove n names))))))))
756 ram 1.6 (rwalk (if (slot-boundp (car cpl) 'slots)
757     cpl
758     (cdr cpl)))
759     (reverse (append names order)))))
760 wlott 1.1
761 ram 1.4 (defun update-gfs-of-class (class)
762 ram 1.6 (when (and (class-finalized-p class)
763     (let ((cpl (class-precedence-list class)))
764     (or (member *the-class-slot-class* cpl)
765     (member *the-class-standard-effective-slot-definition* cpl))))
766 ram 1.4 (let ((gf-table (make-hash-table :test 'eq)))
767     (labels ((collect-gfs (class)
768     (dolist (gf (specializer-direct-generic-functions class))
769     (setf (gethash gf gf-table) t))
770     (mapc #'collect-gfs (class-direct-superclasses class))))
771     (collect-gfs class)
772     (maphash #'(lambda (gf ignore)
773     (declare (ignore ignore))
774     (update-gf-dfun class gf))
775     gf-table)))))
776 wlott 1.1
777     (defun update-inits (class inits)
778 ram 1.6 (setf (plist-value class 'default-initargs) inits))
779 wlott 1.1
780    
781     ;;;
782     ;;;
783     ;;;
784 ram 1.4 (defmethod compute-default-initargs ((class slot-class))
785     (let ((cpl (class-precedence-list class))
786     (direct (class-direct-default-initargs class)))
787     (labels ((walk (tail)
788     (if (null tail)
789     nil
790     (let ((c (pop tail)))
791     (append (if (eq c class)
792     direct
793     (class-direct-default-initargs c))
794     (walk tail))))))
795     (let ((initargs (walk cpl)))
796     (delete-duplicates initargs :test #'eq :key #'car :from-end t)))))
797 wlott 1.1
798    
799     ;;;
800     ;;; Protocols for constructing direct and effective slot definitions.
801     ;;;
802     ;;;
803     ;;;
804     ;;;
805     (defmethod direct-slot-definition-class ((class std-class) initargs)
806     (declare (ignore initargs))
807     (find-class 'standard-direct-slot-definition))
808    
809 ram 1.6 (defun make-direct-slotd (class initargs)
810     (let ((initargs (list* :class class initargs)))
811     (apply #'make-instance (direct-slot-definition-class class initargs) initargs)))
812    
813 wlott 1.1 ;;;
814     ;;;
815     ;;;
816 ram 1.4 (defmethod compute-slots ((class std-class))
817 wlott 1.1 ;;
818     ;; As specified, we must call COMPUTE-EFFECTIVE-SLOT-DEFINITION once
819     ;; for each different slot name we find in our superclasses. Each
820     ;; call receives the class and a list of the dslotds with that name.
821     ;; The list is in most-specific-first order.
822     ;;
823     (let ((name-dslotds-alist ()))
824 ram 1.6 (dolist (c (class-precedence-list class))
825 ram 1.4 (let ((dslotds (class-direct-slots c)))
826     (dolist (d dslotds)
827     (let* ((name (slot-definition-name d))
828     (entry (assq name name-dslotds-alist)))
829     (if entry
830     (push d (cdr entry))
831     (push (list name d) name-dslotds-alist))))))
832     (mapcar #'(lambda (direct)
833     (compute-effective-slot-definition class
834     (nreverse (cdr direct))))
835     name-dslotds-alist)))
836 wlott 1.1
837 ram 1.4 (defmethod compute-slots :around ((class std-class))
838     (let ((eslotds (call-next-method))
839 ram 1.6 (cpl (class-precedence-list class))
840 ram 1.4 (instance-slots ())
841 ram 1.6 (class-slots ()))
842 ram 1.4 (dolist (eslotd eslotds)
843     (let ((alloc (slot-definition-allocation eslotd)))
844     (cond ((eq alloc :instance) (push eslotd instance-slots))
845 ram 1.6 ((classp alloc) (push eslotd class-slots)))))
846     (let ((nlayout (compute-layout cpl instance-slots)))
847 ram 1.4 (dolist (eslotd instance-slots)
848     (setf (slot-definition-location eslotd)
849 ram 1.6 (position (slot-definition-name eslotd) nlayout))))
850 ram 1.4 (dolist (eslotd class-slots)
851     (setf (slot-definition-location eslotd)
852 ram 1.6 (assoc (slot-definition-name eslotd)
853     (class-slot-cells (slot-definition-allocation eslotd)))))
854     (mapc #'initialize-internal-slot-functions eslotds)
855 ram 1.4 eslotds))
856    
857 ram 1.6 (defmethod compute-slots ((class structure-class))
858     (mapcan #'(lambda (superclass)
859     (mapcar #'(lambda (dslotd)
860     (compute-effective-slot-definition class
861     (list dslotd)))
862     (class-direct-slots superclass)))
863     (reverse (slot-value class 'class-precedence-list))))
864 ram 1.4
865 ram 1.6 (defmethod compute-slots :around ((class structure-class))
866     (let ((eslotds (call-next-method)))
867     (mapc #'initialize-internal-slot-functions eslotds)
868     eslotds))
869    
870     (defmethod compute-effective-slot-definition ((class slot-class) dslotds)
871 wlott 1.1 (let* ((initargs (compute-effective-slot-definition-initargs class dslotds))
872 ram 1.6 (class (effective-slot-definition-class class initargs)))
873     (apply #'make-instance class initargs)))
874 wlott 1.1
875     (defmethod effective-slot-definition-class ((class std-class) initargs)
876     (declare (ignore initargs))
877 ram 1.6 (find-class 'standard-effective-slot-definition))
878 wlott 1.1
879 ram 1.6 (defmethod effective-slot-definition-class ((class structure-class) initargs)
880     (declare (ignore initargs))
881     (find-class 'structure-effective-slot-definition))
882    
883 ram 1.4 (defmethod compute-effective-slot-definition-initargs
884     ((class slot-class) direct-slotds)
885 wlott 1.1 (let* ((name nil)
886     (initfunction nil)
887     (initform nil)
888     (initargs nil)
889     (allocation nil)
890     (type t)
891     (namep nil)
892     (initp nil)
893 ram 1.6 (allocp nil))
894 wlott 1.1
895     (dolist (slotd direct-slotds)
896     (when slotd
897     (unless namep
898 ram 1.4 (setq name (slot-definition-name slotd)
899 wlott 1.1 namep t))
900     (unless initp
901 ram 1.4 (when (slot-definition-initfunction slotd)
902 ram 1.6 (setq initform (slot-definition-initform slotd)
903     initfunction (slot-definition-initfunction slotd)
904 wlott 1.1 initp t)))
905     (unless allocp
906 ram 1.4 (setq allocation (slot-definition-allocation slotd)
907 wlott 1.1 allocp t))
908 ram 1.4 (setq initargs (append (slot-definition-initargs slotd) initargs))
909     (let ((slotd-type (slot-definition-type slotd)))
910 ram 1.5 (setq type (cond ((eq type 't) slotd-type)
911 ram 1.4 ((*subtypep type slotd-type) type)
912 ram 1.6 (t `(and ,type ,slotd-type)))))))
913 wlott 1.1 (list :name name
914     :initform initform
915     :initfunction initfunction
916     :initargs initargs
917     :allocation allocation
918 ram 1.4 :type type
919 ram 1.6 :class class)))
920 wlott 1.1
921 ram 1.6 (defmethod compute-effective-slot-definition-initargs :around
922     ((class structure-class) direct-slotds)
923     (let ((slotd (car direct-slotds)))
924     (list* :defstruct-accessor-symbol (slot-definition-defstruct-accessor-symbol slotd)
925     :internal-reader-function (slot-definition-internal-reader-function slotd)
926     :internal-writer-function (slot-definition-internal-writer-function slotd)
927     (call-next-method))))
928 wlott 1.1
929     ;;;
930     ;;; NOTE: For bootstrapping considerations, these can't use make-instance
931     ;;; to make the method object. They have to use make-a-method which
932     ;;; is a specially bootstrapped mechanism for making standard methods.
933     ;;;
934 ram 1.6 (defmethod reader-method-class ((class slot-class) direct-slot &rest initargs)
935     (declare (ignore direct-slot initargs))
936     (find-class 'standard-reader-method))
937 wlott 1.1
938 ram 1.6 (defmethod add-reader-method ((class slot-class) generic-function slot-name)
939     (add-method generic-function
940     (make-a-method 'standard-reader-method
941     ()
942     (list (or (class-name class) 'object))
943     (list class)
944     (make-reader-method-function class slot-name)
945     "automatically generated reader method"
946     slot-name)))
947 wlott 1.1
948 ram 1.6 (defmethod writer-method-class ((class slot-class) direct-slot &rest initargs)
949 ram 1.5 (declare (ignore direct-slot initargs))
950 ram 1.6 (find-class 'standard-writer-method))
951 ram 1.5
952 ram 1.6 (defmethod add-writer-method ((class slot-class) generic-function slot-name)
953     (add-method generic-function
954     (make-a-method 'standard-writer-method
955     ()
956     (list 'new-value (or (class-name class) 'object))
957     (list *the-class-t* class)
958     (make-writer-method-function class slot-name)
959     "automatically generated writer method"
960     slot-name)))
961 ram 1.5
962 ram 1.6 (defmethod add-boundp-method ((class slot-class) generic-function slot-name)
963     (add-method generic-function
964     (make-a-method 'standard-boundp-method
965     ()
966     (list (or (class-name class) 'object))
967     (list class)
968     (make-boundp-method-function class slot-name)
969     "automatically generated boundp method"
970     slot-name)))
971 ram 1.5
972 ram 1.4 (defmethod remove-reader-method ((class slot-class) generic-function)
973 wlott 1.1 (let ((method (get-method generic-function () (list class) nil)))
974     (when method (remove-method generic-function method))))
975    
976 ram 1.4 (defmethod remove-writer-method ((class slot-class) generic-function)
977 wlott 1.1 (let ((method
978     (get-method generic-function () (list *the-class-t* class) nil)))
979     (when method (remove-method generic-function method))))
980    
981 ram 1.4 (defmethod remove-boundp-method ((class slot-class) generic-function)
982     (let ((method (get-method generic-function () (list class) nil)))
983     (when method (remove-method generic-function method))))
984    
985 wlott 1.1
986     ;;;
987     ;;; make-reader-method-function and make-write-method function are NOT part of
988     ;;; the standard protocol. They are however useful, PCL makes uses makes use
989     ;;; of them internally and documents them for PCL users.
990     ;;;
991     ;;; *** This needs work to make type testing by the writer functions which
992     ;;; *** do type testing faster. The idea would be to have one constructor
993     ;;; *** for each possible type test. In order to do this it would be nice
994     ;;; *** to have help from inform-type-system-about-class and friends.
995     ;;;
996     ;;; *** There is a subtle bug here which is going to have to be fixed.
997     ;;; *** Namely, the simplistic use of the template has to be fixed. We
998     ;;; *** have to give the optimize-slot-value method the user might have
999     ;;; *** defined for this metclass a chance to run.
1000     ;;;
1001 ram 1.6 (defmethod make-reader-method-function ((class slot-class) slot-name)
1002     (make-std-reader-method-function (class-name class) slot-name))
1003 wlott 1.1
1004 ram 1.6 (defmethod make-writer-method-function ((class slot-class) slot-name)
1005     (make-std-writer-method-function (class-name class) slot-name))
1006 ram 1.5
1007 ram 1.6 (defmethod make-boundp-method-function ((class slot-class) slot-name)
1008     (make-std-boundp-method-function (class-name class) slot-name))
1009 ram 1.5
1010 wlott 1.1
1011     ;;;; inform-type-system-about-class
1012     ;;;; make-type-predicate
1013     ;;;
1014     ;;; These are NOT part of the standard protocol. They are internal mechanism
1015     ;;; which PCL uses to *try* and tell the type system about class definitions.
1016     ;;; In a more fully integrated implementation of CLOS, the type system would
1017     ;;; know about class objects and class names in a more fundamental way and
1018     ;;; the mechanism used to inform the type system about new classes would be
1019     ;;; different.
1020     ;;;
1021     (defmethod inform-type-system-about-class ((class std-class) name)
1022 ram 1.4 (inform-type-system-about-std-class name))
1023 wlott 1.1
1024    
1025     (defmethod compatible-meta-class-change-p (class proto-new-class)
1026     (eq (class-of class) (class-of proto-new-class)))
1027    
1028 ram 1.4 (defmethod validate-superclass ((class class) (new-super class))
1029     (or (eq new-super *the-class-t*)
1030     (eq (class-of class) (class-of new-super))))
1031 wlott 1.1
1032 dtc 1.16 (defmethod validate-superclass ((class standard-class) (new-super std-class))
1033     (let ((new-super-meta-class (class-of new-super)))
1034     (or (eq new-super-meta-class *the-class-std-class*)
1035     (eq (class-of class) new-super-meta-class))))
1036 ram 1.4
1037 wlott 1.1
1038     ;;;
1039     ;;;
1040     ;;;
1041     (defun force-cache-flushes (class)
1042     (let* ((owrapper (class-wrapper class))
1043     (state (wrapper-state owrapper)))
1044     ;;
1045     ;; We only need to do something if the state is still T. If the
1046     ;; state isn't T, it will be FLUSH or OBSOLETE, and both of those
1047     ;; will already be doing what we want. In particular, we must be
1048     ;; sure we never change an OBSOLETE into a FLUSH since OBSOLETE
1049     ;; means do what FLUSH does and then some.
1050     ;;
1051     (when (eq state 't)
1052 ram 1.6 (let ((nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper)
1053     class)))
1054 wlott 1.1 (setf (wrapper-instance-slots-layout nwrapper)
1055     (wrapper-instance-slots-layout owrapper))
1056     (setf (wrapper-class-slots nwrapper)
1057     (wrapper-class-slots owrapper))
1058 ram 1.6 (without-interrupts
1059 pw 1.9 #+cmu17
1060     (update-lisp-class-layout class nwrapper)
1061 wlott 1.1 (setf (slot-value class 'wrapper) nwrapper)
1062 phg 1.8 (invalidate-wrapper owrapper ':flush nwrapper))))))
1063 wlott 1.1
1064     (defun flush-cache-trap (owrapper nwrapper instance)
1065     (declare (ignore owrapper))
1066     (set-wrapper instance nwrapper))
1067    
1068    
1069    
1070     ;;;
1071     ;;; make-instances-obsolete can be called by user code. It will cause the
1072     ;;; next access to the instance (as defined in 88-002R) to trap through the
1073     ;;; update-instance-for-redefined-class mechanism.
1074     ;;;
1075     (defmethod make-instances-obsolete ((class std-class))
1076 ram 1.6 (let* ((owrapper (class-wrapper class))
1077     (nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper)
1078     class)))
1079 wlott 1.1 (setf (wrapper-instance-slots-layout nwrapper)
1080     (wrapper-instance-slots-layout owrapper))
1081     (setf (wrapper-class-slots nwrapper)
1082     (wrapper-class-slots owrapper))
1083 ram 1.6 (without-interrupts
1084 pw 1.9 #+cmu17
1085     (update-lisp-class-layout class nwrapper)
1086 wlott 1.1 (setf (slot-value class 'wrapper) nwrapper)
1087 ram 1.6 (invalidate-wrapper owrapper ':obsolete nwrapper)
1088     class)))
1089 wlott 1.1
1090     (defmethod make-instances-obsolete ((class symbol))
1091     (make-instances-obsolete (find-class class)))
1092    
1093    
1094     ;;;
1095     ;;; obsolete-instance-trap is the internal trap that is called when we see
1096     ;;; an obsolete instance. The times when it is called are:
1097     ;;; - when the instance is involved in method lookup
1098     ;;; - when attempting to access a slot of an instance
1099     ;;;
1100     ;;; It is not called by class-of, wrapper-of, or any of the low-level instance
1101     ;;; access macros.
1102     ;;;
1103     ;;; Of course these times when it is called are an internal implementation
1104     ;;; detail of PCL and are not part of the documented description of when the
1105     ;;; obsolete instance update happens. The documented description is as it
1106     ;;; appears in 88-002R.
1107     ;;;
1108     ;;; This has to return the new wrapper, so it counts on all the methods on
1109     ;;; obsolete-instance-trap-internal to return the new wrapper. It also does
1110     ;;; a little internal error checking to make sure that the traps are only
1111     ;;; happening when they should, and that the trap methods are computing
1112     ;;; apropriate new wrappers.
1113     ;;;
1114 pw 1.9
1115     ;;; obsolete-instance-trap might be called on structure instances
1116     ;;; after a structure is redefined. In most cases, obsolete-instance-trap
1117     ;;; will not be able to fix the old instance, so it must signal an
1118     ;;; error. The hard part of this is that the error system and debugger
1119     ;;; might cause obsolete-instance-trap to be called again, so in that
1120     ;;; case, we have to return some reasonable wrapper, instead.
1121    
1122     (defvar *in-obsolete-instance-trap* nil)
1123     (defvar *the-wrapper-of-structure-object*
1124     (class-wrapper (find-class 'structure-object)))
1125    
1126     #+cmu17
1127     (define-condition obsolete-structure (error)
1128     ((datum :reader obsolete-structure-datum :initarg :datum))
1129     (:report
1130     (lambda (condition stream)
1131     ;; Don't try to print the structure, since it probably
1132     ;; won't work.
1133     (format stream "Obsolete structure error in ~S:~@
1134     For a structure of type: ~S"
1135     (conditions::condition-function-name condition)
1136     (type-of (obsolete-structure-datum condition))))))
1137    
1138     (defun obsolete-instance-trap (owrapper nwrapper instance)
1139     (if (not #-(or cmu17 new-kcl-wrapper)
1140     (or (std-instance-p instance) (fsc-instance-p instance))
1141     #+cmu17
1142     (pcl-instance-p instance)
1143     #+new-kcl-wrapper
1144     nil)
1145     (if *in-obsolete-instance-trap*
1146     *the-wrapper-of-structure-object*
1147     (let ((*in-obsolete-instance-trap* t))
1148     #-cmu17
1149     (error "The structure ~S is obsolete." instance)
1150     #+cmu17
1151     (error 'obsolete-structure :datum instance)))
1152     (let* ((class (wrapper-class* nwrapper))
1153     (copy (allocate-instance class)) ;??? allocate-instance ???
1154     (olayout (wrapper-instance-slots-layout owrapper))
1155     (nlayout (wrapper-instance-slots-layout nwrapper))
1156     (oslots (get-slots instance))
1157     (nslots (get-slots copy))
1158     (oclass-slots (wrapper-class-slots owrapper))
1159     (added ())
1160     (discarded ())
1161     (plist ()))
1162     ;; local --> local transfer
1163     ;; local --> shared discard
1164     ;; local --> -- discard
1165     ;; shared --> local transfer
1166     ;; shared --> shared discard
1167     ;; shared --> -- discard
1168     ;; -- --> local add
1169     ;; -- --> shared --
1170     ;;
1171     ;; Go through all the old local slots.
1172     ;;
1173     (iterate ((name (list-elements olayout))
1174     (opos (interval :from 0)))
1175     (let ((npos (posq name nlayout)))
1176     (if npos
1177     (setf (instance-ref nslots npos) (instance-ref oslots opos))
1178     (progn
1179     (push name discarded)
1180     (unless (eq (instance-ref oslots opos) *slot-unbound*)
1181     (setf (getf plist name) (instance-ref oslots opos)))))))
1182     ;;
1183     ;; Go through all the old shared slots.
1184     ;;
1185     (iterate ((oclass-slot-and-val (list-elements oclass-slots)))
1186     (let ((name (car oclass-slot-and-val))
1187     (val (cdr oclass-slot-and-val)))
1188     (let ((npos (posq name nlayout)))
1189     (if npos
1190     (setf (instance-ref nslots npos) (cdr oclass-slot-and-val))
1191     (progn (push name discarded)
1192     (unless (eq val *slot-unbound*)
1193     (setf (getf plist name) val)))))))
1194     ;;
1195     ;; Go through all the new local slots to compute the added slots.
1196     ;;
1197     (dolist (nlocal nlayout)
1198     (unless (or (memq nlocal olayout)
1199     (assq nlocal oclass-slots))
1200     (push nlocal added)))
1201 wlott 1.1
1202 pw 1.9 (swap-wrappers-and-slots instance copy)
1203 wlott 1.1
1204 pw 1.9 (update-instance-for-redefined-class instance
1205     added
1206     discarded
1207     plist)
1208     nwrapper)))
1209 wlott 1.1
1210    
1211     ;;;
1212     ;;;
1213     ;;;
1214 ram 1.6 (defmacro copy-instance-internal (instance)
1215     `(#+new-kcl-wrapper if #-new-kcl-wrapper progn
1216     #+new-kcl-wrapper (not (std-instance-p ,instance))
1217     (let* ((class (class-of instance))
1218     (copy (allocate-instance class)))
1219     (if (std-instance-p ,instance)
1220     (setf (std-instance-slots ,instance) (std-instance-slots ,instance))
1221     (setf (fsc-instance-slots ,instance) (fsc-instance-slots ,instance)))
1222     copy)
1223     #+new-kcl-wrapper
1224     (copy-structure-header ,instance)))
1225 wlott 1.1
1226 ram 1.6 (defun change-class-internal (instance new-class)
1227     (let* ((old-class (class-of instance))
1228 pw 1.9 (copy (allocate-instance new-class))
1229     (new-wrapper (get-wrapper copy))
1230 ram 1.6 (old-wrapper (class-wrapper old-class))
1231     (old-layout (wrapper-instance-slots-layout old-wrapper))
1232     (new-layout (wrapper-instance-slots-layout new-wrapper))
1233     (old-slots (get-slots instance))
1234 pw 1.9 (new-slots (get-slots copy))
1235 ram 1.6 (old-class-slots (wrapper-class-slots old-wrapper)))
1236    
1237 wlott 1.1 ;;
1238     ;; "The values of local slots specified by both the class Cto and
1239     ;; Cfrom are retained. If such a local slot was unbound, it remains
1240     ;; unbound."
1241     ;;
1242     (iterate ((new-slot (list-elements new-layout))
1243     (new-position (interval :from 0)))
1244 ram 1.4 (let ((old-position (posq new-slot old-layout)))
1245 wlott 1.1 (when old-position
1246 ram 1.6 (setf (instance-ref new-slots new-position)
1247     (instance-ref old-slots old-position)))))
1248 wlott 1.1
1249     ;;
1250     ;; "The values of slots specified as shared in the class Cfrom and
1251     ;; as local in the class Cto are retained."
1252     ;;
1253     (iterate ((slot-and-val (list-elements old-class-slots)))
1254 ram 1.4 (let ((position (posq (car slot-and-val) new-layout)))
1255 wlott 1.1 (when position
1256 ram 1.6 (setf (instance-ref new-slots position) (cdr slot-and-val)))))
1257 wlott 1.1
1258     ;; Make the copy point to the old instance's storage, and make the
1259     ;; old instance point to the new storage.
1260 pw 1.9 (swap-wrappers-and-slots instance copy)
1261 wlott 1.1
1262     (update-instance-for-different-class copy instance)
1263     instance))
1264    
1265     (defmethod change-class ((instance standard-object)
1266     (new-class standard-class))
1267 ram 1.6 (change-class-internal instance new-class))
1268 wlott 1.1
1269 dtc 1.15 (defmethod change-class ((instance funcallable-standard-object)
1270 wlott 1.1 (new-class funcallable-standard-class))
1271 ram 1.6 (change-class-internal instance new-class))
1272 dtc 1.17
1273     (defmethod change-class ((instance standard-object)
1274     (new-class funcallable-standard-class))
1275     (error "Can't change the class of ~S to ~S~@
1276     because it isn't already an instance with metaclass ~S."
1277     instance new-class 'standard-class))
1278    
1279     (defmethod change-class ((instance funcallable-standard-object)
1280     (new-class standard-class))
1281     (error "Can't change the class of ~S to ~S~@
1282     because it isn't already an instance with metaclass ~S."
1283     instance new-class 'funcallable-standard-class))
1284 wlott 1.1
1285     (defmethod change-class ((instance t) (new-class-name symbol))
1286     (change-class instance (find-class new-class-name)))
1287    
1288    
1289    
1290     ;;;
1291     ;;; The metaclass BUILT-IN-CLASS
1292     ;;;
1293     ;;; This metaclass is something of a weird creature. By this point, all
1294     ;;; instances of it which will exist have been created, and no instance
1295     ;;; is ever created by calling MAKE-INSTANCE.
1296     ;;;
1297     ;;; But, there are other parts of the protcol we must follow and those
1298     ;;; definitions appear here.
1299     ;;;
1300     (defmethod shared-initialize :before
1301     ((class built-in-class) slot-names &rest initargs)
1302 ram 1.5 (declare (ignore slot-names initargs))
1303 wlott 1.1 (error "Attempt to initialize or reinitialize a built in class."))
1304    
1305 ram 1.6 (defmethod class-direct-slots ((class built-in-class)) ())
1306     (defmethod class-slots ((class built-in-class)) ())
1307     (defmethod class-direct-default-initargs ((class built-in-class)) ())
1308     (defmethod class-default-initargs ((class built-in-class)) ())
1309    
1310 ram 1.4 (defmethod validate-superclass ((c class) (s built-in-class))
1311 dtc 1.14 (or (eq s *the-class-t*) #+cmu (eq s *the-class-stream*)))
1312 wlott 1.1
1313 ram 1.4
1314 wlott 1.1
1315     ;;;
1316     ;;;
1317     ;;;
1318    
1319 ram 1.4 (defmethod validate-superclass ((c slot-class)
1320 dtc 1.16 (f forward-referenced-class))
1321 wlott 1.1 't)
1322    
1323    
1324     ;;;
1325     ;;;
1326     ;;;
1327    
1328     (defmethod add-dependent ((metaobject dependent-update-mixin) dependent)
1329     (pushnew dependent (plist-value metaobject 'dependents)))
1330    
1331     (defmethod remove-dependent ((metaobject dependent-update-mixin) dependent)
1332     (setf (plist-value metaobject 'dependents)
1333     (delete dependent (plist-value metaobject 'dependents))))
1334    
1335     (defmethod map-dependents ((metaobject dependent-update-mixin) function)
1336     (dolist (dependent (plist-value metaobject 'dependents))
1337 ram 1.2 (funcall function dependent)))
1338 ram 1.4

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