1 ;;;; This software is part of the SBCL system. See the README file for
4 ;;;; This software is derived from software originally released by Xerox
5 ;;;; Corporation. Copyright and release statements follow. Later modifications
6 ;;;; to the software are in the public domain and are provided with
7 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
10 ;;;; copyright information from original PCL sources:
12 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
13 ;;;; All rights reserved.
15 ;;;; Use and copying of this software and preparation of derivative works based
16 ;;;; upon this software are permitted. Any distribution of this software or
17 ;;;; derivative works must comply with all applicable United States export
20 ;;;; This software is made available AS IS, and Xerox Corporation makes no
21 ;;;; warranty about the software, its performance or its conformity to any
26 (defmethod slot-accessor-function ((slotd effective-slot-definition) type)
28 (reader (slot-definition-reader-function slotd))
29 (writer (slot-definition-writer-function slotd))
30 (boundp (slot-definition-boundp-function slotd))))
32 (defmethod (setf slot-accessor-function) (function
33 (slotd effective-slot-definition)
36 (reader (setf (slot-definition-reader-function slotd) function))
37 (writer (setf (slot-definition-writer-function slotd) function))
38 (boundp (setf (slot-definition-boundp-function slotd) function))))
40 (defconstant +slotd-reader-function-std-p+ 1)
41 (defconstant +slotd-writer-function-std-p+ 2)
42 (defconstant +slotd-boundp-function-std-p+ 4)
43 (defconstant +slotd-all-function-std-p+ 7)
45 (defmethod slot-accessor-std-p ((slotd effective-slot-definition) type)
46 (let ((flags (slot-value slotd 'accessor-flags)))
47 (declare (type fixnum flags))
49 (eql +slotd-all-function-std-p+ flags)
50 (let ((mask (ecase type
51 (reader +slotd-reader-function-std-p+)
52 (writer +slotd-writer-function-std-p+)
53 (boundp +slotd-boundp-function-std-p+))))
54 (declare (type fixnum mask))
55 (not (zerop (the fixnum (logand mask flags))))))))
57 (defmethod (setf slot-accessor-std-p) (value
58 (slotd effective-slot-definition)
60 (let ((mask (ecase type
61 (reader +slotd-reader-function-std-p+)
62 (writer +slotd-writer-function-std-p+)
63 (boundp +slotd-boundp-function-std-p+)))
64 (flags (slot-value slotd 'accessor-flags)))
65 (declare (type fixnum mask flags))
66 (setf (slot-value slotd 'accessor-flags)
68 (the fixnum (logior mask flags))
69 (the fixnum (logand (the fixnum (lognot mask)) flags)))))
72 (defmethod initialize-internal-slot-functions ((slotd
73 effective-slot-definition))
74 (let* ((name (slot-value slotd 'name))
75 (class (slot-value slotd 'class)))
76 (let ((table (or (gethash name *name->class->slotd-table*)
77 (setf (gethash name *name->class->slotd-table*)
78 (make-hash-table :test 'eq :size 5)))))
79 (setf (gethash class table) slotd))
80 (dolist (type '(reader writer boundp))
81 (let* ((gf-name (ecase type
82 (reader 'slot-value-using-class)
83 (writer '(setf slot-value-using-class))
84 (boundp 'slot-boundp-using-class)))
85 (gf (gdefinition gf-name)))
86 (compute-slot-accessor-info slotd type gf)))
87 (initialize-internal-slot-gfs name)))
89 ;;; CMUCL (Gerd PCL 2003-04-25) comment:
91 ;;; Compute an effective method for SLOT-VALUE-USING-CLASS, (SETF
92 ;;; SLOT-VALUE-USING-CLASS) or SLOT-BOUNDP-USING-CLASS for reading/
93 ;;; writing/testing effective slot SLOTD.
95 ;;; TYPE is one of the symbols READER, WRITER or BOUNDP, depending on
96 ;;; GF. Store the effective method in the effective slot definition
97 ;;; object itself; these GFs have special dispatch functions calling
98 ;;; effective methods directly retrieved from effective slot
99 ;;; definition objects, as an optimization.
101 ;;; FIXME: Change the function name to COMPUTE-SVUC-SLOTD-FUNCTION,
103 (defmethod compute-slot-accessor-info ((slotd effective-slot-definition)
105 (let* ((name (slot-value slotd 'name))
106 (class (slot-value slotd 'class))
107 (old-slotd (find-slot-definition class name))
108 (old-std-p (and old-slotd (slot-accessor-std-p old-slotd 'all))))
109 (multiple-value-bind (function std-p)
110 (if (eq *boot-state* 'complete)
111 (get-accessor-method-function gf type class slotd)
112 (get-optimized-std-accessor-method-function class slotd type))
113 (setf (slot-accessor-std-p slotd type) std-p)
114 (setf (slot-accessor-function slotd type) function))
115 (when (and old-slotd (not (eq old-std-p (slot-accessor-std-p slotd 'all))))
116 (push (cons class name) *pv-table-cache-update-info*))))
118 (defmethod slot-definition-allocation ((slotd structure-slot-definition))
121 ;;;; various class accessors that are a little more complicated than can be
122 ;;;; done with automatically generated reader methods
124 (defmethod class-prototype ((class std-class))
125 (with-slots (prototype) class
126 (or prototype (setq prototype (allocate-instance class)))))
128 (defmethod class-prototype ((class structure-class))
129 (with-slots (prototype wrapper defstruct-constructor) class
132 (if defstruct-constructor
133 (allocate-instance class)
134 (allocate-standard-instance wrapper))))))
136 (defmethod class-direct-default-initargs ((class slot-class))
137 (plist-value class 'direct-default-initargs))
139 (defmethod class-default-initargs ((class slot-class))
140 (plist-value class 'default-initargs))
142 (defmethod class-slot-cells ((class std-class))
143 (plist-value class 'class-slot-cells))
145 ;;;; class accessors that are even a little bit more complicated than those
146 ;;;; above. These have a protocol for updating them, we must implement that
149 ;;; Maintaining the direct subclasses backpointers. The update methods are
150 ;;; here, the values are read by an automatically generated reader method.
151 (defmethod add-direct-subclass ((class class) (subclass class))
152 (with-slots (direct-subclasses) class
153 (pushnew subclass direct-subclasses)
155 (defmethod remove-direct-subclass ((class class) (subclass class))
156 (with-slots (direct-subclasses) class
157 (setq direct-subclasses (remove subclass direct-subclasses))
160 ;;; Maintaining the direct-methods and direct-generic-functions backpointers.
162 ;;; There are four generic functions involved, each has one method for the
163 ;;; class case and another method for the damned EQL specializers. All of
164 ;;; these are specified methods and appear in their specified place in the
167 ;;; ADD-DIRECT-METHOD
168 ;;; REMOVE-DIRECT-METHOD
169 ;;; SPECIALIZER-DIRECT-METHODS
170 ;;; SPECIALIZER-DIRECT-GENERIC-FUNCTIONS
172 ;;; In each case, we maintain one value which is a cons. The car is the list
173 ;;; methods. The cdr is a list of the generic functions. The cdr is always
175 (defmethod add-direct-method ((specializer class) (method method))
176 (with-slots (direct-methods) specializer
177 (setf (car direct-methods) (adjoin method (car direct-methods)) ;PUSH
178 (cdr direct-methods) ()))
180 (defmethod remove-direct-method ((specializer class) (method method))
181 (with-slots (direct-methods) specializer
182 (setf (car direct-methods) (remove method (car direct-methods))
183 (cdr direct-methods) ()))
186 (defmethod specializer-direct-methods ((specializer class))
187 (with-slots (direct-methods) specializer
188 (car direct-methods)))
190 (defmethod specializer-direct-generic-functions ((specializer class))
191 (with-slots (direct-methods) specializer
192 (or (cdr direct-methods)
193 (setf (cdr direct-methods)
195 (dolist (m (car direct-methods))
196 ;; the old PCL code used COLLECTING-ONCE which used
197 ;; #'EQ to check for newness
198 (pushnew (method-generic-function m) collect :test #'eq))
199 (nreverse collect))))))
201 ;;; This hash table is used to store the direct methods and direct generic
202 ;;; functions of EQL specializers. Each value in the table is the cons.
203 (defvar *eql-specializer-methods* (make-hash-table :test 'eql))
204 (defvar *class-eq-specializer-methods* (make-hash-table :test 'eq))
206 (defmethod specializer-method-table ((specializer eql-specializer))
207 *eql-specializer-methods*)
209 (defmethod specializer-method-table ((specializer class-eq-specializer))
210 *class-eq-specializer-methods*)
212 (defmethod add-direct-method ((specializer specializer-with-object)
214 (let* ((object (specializer-object specializer))
215 (table (specializer-method-table specializer))
216 (entry (gethash object table)))
219 (setf (gethash object table)
221 (setf (car entry) (adjoin method (car entry))
225 (defmethod remove-direct-method ((specializer specializer-with-object)
227 (let* ((object (specializer-object specializer))
228 (entry (gethash object (specializer-method-table specializer))))
230 (setf (car entry) (remove method (car entry))
234 (defmethod specializer-direct-methods ((specializer specializer-with-object))
235 (car (gethash (specializer-object specializer)
236 (specializer-method-table specializer))))
238 (defmethod specializer-direct-generic-functions ((specializer
239 specializer-with-object))
240 (let* ((object (specializer-object specializer))
241 (entry (gethash object (specializer-method-table specializer))))
246 (dolist (m (car entry))
247 (pushnew (method-generic-function m) collect :test #'eq))
248 (nreverse collect)))))))
250 (defun map-specializers (function)
251 (map-all-classes (lambda (class)
252 (funcall function (class-eq-specializer class))
253 (funcall function class)))
254 (maphash (lambda (object methods)
255 (declare (ignore methods))
256 (intern-eql-specializer object))
257 *eql-specializer-methods*)
258 (maphash (lambda (object specl)
259 (declare (ignore object))
260 (funcall function specl))
261 *eql-specializer-table*)
264 (defun map-all-generic-functions (function)
265 (let ((all-generic-functions (make-hash-table :test 'eq)))
266 (map-specializers (lambda (specl)
267 (dolist (gf (specializer-direct-generic-functions
269 (unless (gethash gf all-generic-functions)
270 (setf (gethash gf all-generic-functions) t)
271 (funcall function gf))))))
274 (defmethod shared-initialize :after ((specl class-eq-specializer)
277 (declare (ignore slot-names))
278 (setf (slot-value specl 'type) `(class-eq ,(specializer-class specl))))
280 (defmethod shared-initialize :after ((specl eql-specializer) slot-names &key)
281 (declare (ignore slot-names))
282 (setf (slot-value specl 'type)
283 `(eql ,(specializer-object specl)))
284 (setf (info :type :translator specl)
285 (constantly (make-member-type :members (list (specializer-object specl))))))
288 (defun real-load-defclass (name metaclass-name supers slots other)
289 (let ((res (apply #'ensure-class name :metaclass metaclass-name
290 :direct-superclasses supers
292 :definition-source `((defclass ,name)
297 (setf (gdefinition 'load-defclass) #'real-load-defclass)
299 (defun ensure-class (name &rest args)
300 (apply #'ensure-class-using-class
301 (let ((class (find-class name nil)))
302 (when (and class (eq name (class-name class)))
303 ;; NAME is the proper name of CLASS, so redefine it
308 (defmethod ensure-class-using-class ((class null) name &rest args &key)
309 (without-package-locks
310 (multiple-value-bind (meta initargs)
311 (ensure-class-values class args)
312 (set-class-type-translation (class-prototype meta) name)
313 (setf class (apply #'make-instance meta :name name initargs)
314 (find-class name) class)
315 (set-class-type-translation class name)
318 (defmethod ensure-class-using-class ((class pcl-class) name &rest args &key)
319 (without-package-locks
320 (multiple-value-bind (meta initargs)
321 (ensure-class-values class args)
322 (unless (eq (class-of class) meta)
323 (apply #'change-class class meta initargs))
324 (apply #'reinitialize-instance class initargs)
325 (setf (find-class name) class)
326 (set-class-type-translation class name)
329 (defmethod class-predicate-name ((class t))
334 ((not (legal-class-name-p s))
335 (error "~S is not a class or a legal class name." s))
337 (or (find-class s nil)
338 (make-instance 'forward-referenced-class
341 (defun ensure-class-values (class args)
342 (let* ((initargs (copy-list args))
343 (unsupplied (list 1))
344 (supplied-meta (getf initargs :metaclass unsupplied))
345 (supplied-supers (getf initargs :direct-superclasses unsupplied))
346 (supplied-slots (getf initargs :direct-slots unsupplied))
348 (cond ((neq supplied-meta unsupplied)
349 (find-class supplied-meta))
351 (forward-referenced-class-p class))
352 *the-class-standard-class*)
355 ;; KLUDGE: It seemed to me initially that there ought to be a way
356 ;; of collecting all the erroneous problems in one go, rather than
357 ;; this way of solving the problem of signalling the errors that
358 ;; we are required to, which stops at the first bogus input.
359 ;; However, after playing around a little, I couldn't find that
360 ;; way, so I've left it as is, but if someone does come up with a
361 ;; better way... -- CSR, 2002-09-08
362 (do ((direct-slots (getf initargs :direct-slots) (cdr direct-slots)))
363 ((endp direct-slots) nil)
364 (destructuring-bind (slot &rest more) direct-slots
365 (let ((slot-name (getf slot :name)))
366 (when (some (lambda (s) (eq slot-name (getf s :name))) more)
367 ;; FIXME: It's quite possible that we ought to define an
368 ;; SB-INT:PROGRAM-ERROR function to signal these and other
369 ;; errors throughout the codebase that are required to be
370 ;; of type PROGRAM-ERROR.
371 (error 'simple-program-error
372 :format-control "~@<There is more than one direct slot ~
374 :format-arguments (list slot-name)))
375 (do ((stuff slot (cddr stuff)))
377 (destructuring-bind (option value &rest more) stuff
379 ((and (member option '(:allocation :type
380 :initform :documentation))
382 (getf more option unsupplied))))
383 (error 'simple-program-error
384 :format-control "~@<Duplicate slot option ~S for ~
386 :format-arguments (list option slot-name)))
387 ((and (eq option :readers)
388 (notevery #'symbolp value))
389 (error 'simple-program-error
390 :format-control "~@<Slot reader names for slot ~
391 named ~S must be symbols.~:>"
392 :format-arguments (list slot-name)))
393 ((and (eq option :initargs)
394 (notevery #'symbolp value))
395 (error 'simple-program-error
396 :format-control "~@<Slot initarg names for slot ~
397 named ~S must be symbols.~:>"
398 :format-arguments (list slot-name)))))))))
399 (loop for (initarg . more) on (getf initargs :direct-default-initargs)
400 for name = (car initarg)
401 when (some (lambda (a) (eq (car a) name)) more)
402 do (error 'simple-program-error
403 :format-control "~@<Duplicate initialization argument ~
404 name ~S in :DEFAULT-INITARGS.~:>"
405 :format-arguments (list name class)))
407 (default-initargs 0))
408 (do ((args initargs (cddr args)))
412 (when (> (incf metaclass) 1)
413 (error 'simple-program-error
414 :format-control "~@<More than one :METACLASS ~
415 option specified.~:>")))
416 (:direct-default-initargs
417 (when (> (incf default-initargs) 1)
418 (error 'simple-program-error
419 :format-control "~@<More than one :DEFAULT-INITARGS ~
420 option specified.~:>"))))))
421 (remf initargs :metaclass)
422 (loop (unless (remf initargs :direct-superclasses) (return)))
423 (loop (unless (remf initargs :direct-slots) (return)))
427 (when (neq supplied-supers unsupplied)
428 (list :direct-superclasses (mapcar #'fix-super supplied-supers)))
429 (when (neq supplied-slots unsupplied)
430 (list :direct-slots supplied-slots))
433 (defmethod shared-initialize :after
436 &key (direct-superclasses nil direct-superclasses-p)
437 (direct-slots nil direct-slots-p)
438 (direct-default-initargs nil direct-default-initargs-p)
439 (predicate-name nil predicate-name-p))
440 (cond (direct-superclasses-p
441 (setq direct-superclasses
442 (or direct-superclasses
443 (list (if (funcallable-standard-class-p class)
444 *the-class-funcallable-standard-object*
445 *the-class-standard-object*))))
446 (dolist (superclass direct-superclasses)
447 (unless (validate-superclass class superclass)
448 (error "The class ~S was specified as a~%
449 super-class of the class ~S;~%~
450 but the meta-classes ~S and~%~S are incompatible.~@
451 Define a method for ~S to avoid this error."
452 superclass class (class-of superclass) (class-of class)
453 'validate-superclass)))
454 (setf (slot-value class 'direct-superclasses) direct-superclasses))
456 (setq direct-superclasses (slot-value class 'direct-superclasses))))
459 (setf (slot-value class 'direct-slots)
460 (mapcar (lambda (pl) (make-direct-slotd class pl))
462 (slot-value class 'direct-slots)))
463 (if direct-default-initargs-p
464 (setf (plist-value class 'direct-default-initargs)
465 direct-default-initargs)
466 (setq direct-default-initargs
467 (plist-value class 'direct-default-initargs)))
468 (setf (plist-value class 'class-slot-cells)
469 (let ((old-class-slot-cells (plist-value class 'class-slot-cells))
471 (dolist (dslotd direct-slots)
472 (when (eq :class (slot-definition-allocation dslotd))
474 (let* ((name (slot-definition-name dslotd))
475 (old (assoc name old-class-slot-cells)))
478 (member name slot-names))
479 (let* ((initfunction (slot-definition-initfunction dslotd))
480 (value (if initfunction
481 (funcall initfunction)
483 (push (cons name value) collect))
484 (push old collect)))))
486 (setq predicate-name (if predicate-name-p
487 (setf (slot-value class 'predicate-name)
488 (car predicate-name))
489 (or (slot-value class 'predicate-name)
490 (setf (slot-value class 'predicate-name)
491 (make-class-predicate-name (class-name
493 (add-direct-subclasses class direct-superclasses)
494 (make-class-predicate class predicate-name)
495 (update-class class nil)
496 (do* ((slots (slot-value class 'slots) (cdr slots))
498 ((null slots) (when dupes
500 ;; FIXME: the indentation request ("~4I")
501 ;; below appears not to do anything. Finding
502 ;; out why would be nice. -- CSR, 2003-04-24
503 "~@<slot names with the same SYMBOL-NAME but ~
504 different SYMBOL-PACKAGE (possible package problem) ~
505 for class ~S:~@:_~4I~<~@{~S~^~:@_~}~:>~@:>"
508 (let* ((slot (car slots))
509 (oslots (remove (slot-definition-name slot) (cdr slots)
510 :test #'string/= :key #'slot-definition-name)))
512 (pushnew (cons (slot-definition-name slot)
513 (mapcar #'slot-definition-name oslots))
515 :test #'string= :key #'car))))
516 (add-slot-accessors class direct-slots)
517 (make-preliminary-layout class))
519 (defmethod shared-initialize :after ((class forward-referenced-class)
520 slot-names &key &allow-other-keys)
521 (declare (ignore slot-names))
522 (make-preliminary-layout class))
524 (defvar *allow-forward-referenced-classes-in-cpl-p* nil)
526 ;;; Give CLASS a preliminary layout if it doesn't have one already, to
527 ;;; make it known to the type system.
528 (defun make-preliminary-layout (class)
529 (flet ((compute-preliminary-cpl (root)
530 (let ((*allow-forward-referenced-classes-in-cpl-p* t))
531 (compute-class-precedence-list root))))
532 (without-package-locks
533 (unless (class-finalized-p class)
534 (let ((name (class-name class)))
535 (setf (find-class name) class)
536 ;; KLUDGE: This is fairly horrible. We need to make a
537 ;; full-fledged CLASSOID here, not just tell the compiler that
538 ;; some class is forthcoming, because there are legitimate
539 ;; questions one can ask of the type system, implemented in
540 ;; terms of CLASSOIDs, involving forward-referenced classes. So.
541 (when (and (eq *boot-state* 'complete)
542 (null (find-classoid name nil)))
543 (setf (find-classoid name)
544 (make-standard-classoid :name name)))
545 (set-class-type-translation class name)
546 (let ((layout (make-wrapper 0 class))
547 (classoid (find-classoid name)))
548 (setf (layout-classoid layout) classoid)
549 (setf (classoid-pcl-class classoid) class)
550 (setf (slot-value class 'wrapper) layout)
551 (let ((cpl (compute-preliminary-cpl class)))
552 (setf (layout-inherits layout)
553 (order-layout-inherits
554 (map 'simple-vector #'class-wrapper
555 (reverse (rest cpl))))))
556 (register-layout layout :invalidate t)
557 (setf (classoid-layout classoid) layout)
558 (mapc #'make-preliminary-layout (class-direct-subclasses class))))))))
561 (defmethod shared-initialize :before ((class class) slot-names &key name)
562 (declare (ignore slot-names name))
563 ;; FIXME: Could this just be CLASS instead of `(CLASS ,CLASS)? If not,
564 ;; why not? (See also similar expression in !BOOTSTRAP-INITIALIZE-CLASS.)
565 (setf (slot-value class 'type) `(class ,class))
566 (setf (slot-value class 'class-eq-specializer)
567 (make-instance 'class-eq-specializer :class class)))
569 (defmethod reinitialize-instance :before ((class slot-class) &key)
570 (remove-direct-subclasses class (class-direct-superclasses class))
571 (remove-slot-accessors class (class-direct-slots class)))
573 (defmethod reinitialize-instance :after ((class slot-class)
576 (map-dependents class
578 (apply #'update-dependent class dependent initargs))))
580 (defmethod shared-initialize :after ((class condition-class) slot-names
581 &key direct-slots direct-superclasses)
582 (declare (ignore slot-names))
583 (let ((classoid (find-classoid (class-name class))))
584 (with-slots (wrapper class-precedence-list prototype predicate-name
585 (direct-supers direct-superclasses))
587 (setf (slot-value class 'direct-slots)
588 (mapcar (lambda (pl) (make-direct-slotd class pl))
590 (setf (slot-value class 'finalized-p) t)
591 (setf (classoid-pcl-class classoid) class)
592 (setq direct-supers direct-superclasses)
593 (setq wrapper (classoid-layout classoid))
594 (setq class-precedence-list (compute-class-precedence-list class))
595 (setq prototype (make-condition (class-name class)))
596 (add-direct-subclasses class direct-superclasses)
597 (setq predicate-name (make-class-predicate-name (class-name class)))
598 (make-class-predicate class predicate-name)
599 (setf (slot-value class 'slots) (compute-slots class))))
600 ;; Comment from Gerd's PCL, 2003-05-15:
602 ;; We don't ADD-SLOT-ACCESSORS here because we don't want to
603 ;; override condition accessors with generic functions. We do this
605 (update-pv-table-cache-info class))
607 (defmethod direct-slot-definition-class ((class condition-class)
609 (declare (ignore initargs))
610 (find-class 'condition-direct-slot-definition))
612 (defmethod effective-slot-definition-class ((class condition-class)
614 (declare (ignore initargs))
615 (find-class 'condition-effective-slot-definition))
617 (defmethod finalize-inheritance ((class condition-class))
618 (aver (slot-value class 'finalized-p))
621 (defmethod compute-effective-slot-definition
622 ((class condition-class) slot-name dslotds)
623 (let ((slotd (call-next-method)))
624 (setf (slot-definition-reader-function slotd)
626 (handler-case (condition-reader-function x slot-name)
627 ;; FIXME: FIND-SLOT-DEFAULT throws an error if the slot
628 ;; is unbound; maybe it should be a CELL-ERROR of some
630 (error () (values (slot-unbound class x slot-name))))))
631 (setf (slot-definition-writer-function slotd)
633 (condition-writer-function x v slot-name)))
634 (setf (slot-definition-boundp-function slotd)
636 (multiple-value-bind (v c)
637 (ignore-errors (condition-reader-function x slot-name))
642 (defmethod compute-slots ((class condition-class))
643 (mapcan (lambda (superclass)
644 (mapcar (lambda (dslotd)
645 (compute-effective-slot-definition
646 class (slot-definition-name dslotd) (list dslotd)))
647 (class-direct-slots superclass)))
648 (reverse (slot-value class 'class-precedence-list))))
650 (defmethod compute-slots :around ((class condition-class))
651 (let ((eslotds (call-next-method)))
652 (mapc #'initialize-internal-slot-functions eslotds)
655 (defmethod shared-initialize :after
656 ((slotd structure-slot-definition) slot-names &key
657 (allocation :instance) allocation-class)
658 (declare (ignore slot-names allocation-class))
659 (unless (eq allocation :instance)
660 (error "Structure slots must have :INSTANCE allocation.")))
662 (defun make-structure-class-defstruct-form (name direct-slots include)
663 (let* ((conc-name (format-symbol *package* "~S structure class " name))
664 (constructor (format-symbol *package* "~Aconstructor" conc-name))
665 (defstruct `(defstruct (,name
667 `((:include ,(class-name include))))
669 (:conc-name ,conc-name)
670 (:constructor ,constructor ())
672 ,@(mapcar (lambda (slot)
673 `(,(slot-definition-name slot)
676 (reader-names (mapcar (lambda (slotd)
677 (list 'slot-accessor name
678 (slot-definition-name slotd)
681 (writer-names (mapcar (lambda (slotd)
682 (list 'slot-accessor name
683 (slot-definition-name slotd)
687 (mapcar (lambda (slotd reader-name)
689 (slot-definition-defstruct-accessor-symbol
691 `(defun ,reader-name (obj)
692 (declare (type ,name obj))
694 direct-slots reader-names))
696 (mapcar (lambda (slotd writer-name)
698 (slot-definition-defstruct-accessor-symbol
700 `(defun ,writer-name (nv obj)
701 (declare (type ,name obj))
702 (setf (,accessor obj) nv))))
703 direct-slots writer-names))
707 ,@readers-init ,@writers-init
709 (values defstruct-form constructor reader-names writer-names)))
711 (defun make-defstruct-allocation-function (class)
712 (let ((dd (get-structure-dd (class-name class))))
714 (let ((instance (%make-instance (dd-length dd)))
715 (raw-index (dd-raw-index dd)))
716 (setf (%instance-layout instance)
717 (sb-kernel::compiler-layout-or-lose (dd-name dd)))
719 (setf (%instance-ref instance raw-index)
720 (make-array (dd-raw-length dd)
721 :element-type '(unsigned-byte 32))))
724 (defmethod shared-initialize :after
725 ((class structure-class)
727 &key (direct-superclasses nil direct-superclasses-p)
728 (direct-slots nil direct-slots-p)
729 direct-default-initargs
730 (predicate-name nil predicate-name-p))
731 (declare (ignore slot-names direct-default-initargs))
732 (if direct-superclasses-p
733 (setf (slot-value class 'direct-superclasses)
734 (or direct-superclasses
735 (setq direct-superclasses
736 (and (not (eq (class-name class) 'structure-object))
737 (list *the-class-structure-object*)))))
738 (setq direct-superclasses (slot-value class 'direct-superclasses)))
739 (let* ((name (class-name class))
740 (from-defclass-p (slot-value class 'from-defclass-p))
741 (defstruct-p (or from-defclass-p (not (structure-type-p name)))))
743 (setf (slot-value class 'direct-slots)
747 (let* ((slot-name (getf pl :name))
749 (format-symbol *package*
750 "~S structure class ~A"
752 (setq pl (list* :defstruct-accessor-symbol
754 (make-direct-slotd class pl))
756 (setq direct-slots (slot-value class 'direct-slots)))
758 (let ((include (car (slot-value class 'direct-superclasses))))
759 (multiple-value-bind (defstruct-form constructor reader-names writer-names)
760 (make-structure-class-defstruct-form name direct-slots include)
761 (unless (structure-type-p name) (eval defstruct-form))
762 (mapc (lambda (dslotd reader-name writer-name)
763 (let* ((reader (gdefinition reader-name))
764 (writer (when (gboundp writer-name)
765 (gdefinition writer-name))))
766 (setf (slot-value dslotd 'internal-reader-function)
768 (setf (slot-value dslotd 'internal-writer-function)
770 direct-slots reader-names writer-names)
771 (setf (slot-value class 'defstruct-form) defstruct-form)
772 (setf (slot-value class 'defstruct-constructor) constructor)))
773 (setf (slot-value class 'defstruct-constructor)
774 (make-defstruct-allocation-function class)))
775 (add-direct-subclasses class direct-superclasses)
776 (setf (slot-value class 'class-precedence-list)
777 (compute-class-precedence-list class))
778 (setf (slot-value class 'slots) (compute-slots class))
779 (let ((lclass (find-classoid (class-name class))))
780 (setf (classoid-pcl-class lclass) class)
781 (setf (slot-value class 'wrapper) (classoid-layout lclass)))
782 (setf (slot-value class 'finalized-p) t)
783 (update-pv-table-cache-info class)
784 (setq predicate-name (if predicate-name-p
785 (setf (slot-value class 'predicate-name)
786 (car predicate-name))
787 (or (slot-value class 'predicate-name)
788 (setf (slot-value class 'predicate-name)
789 (make-class-predicate-name
790 (class-name class))))))
791 (make-class-predicate class predicate-name)
792 (add-slot-accessors class direct-slots)))
794 (defmethod direct-slot-definition-class ((class structure-class) &rest initargs)
795 (declare (ignore initargs))
796 (find-class 'structure-direct-slot-definition))
798 (defmethod finalize-inheritance ((class structure-class))
799 nil) ; always finalized
801 (defun add-slot-accessors (class dslotds)
802 (fix-slot-accessors class dslotds 'add))
804 (defun remove-slot-accessors (class dslotds)
805 (fix-slot-accessors class dslotds 'remove))
807 (defun fix-slot-accessors (class dslotds add/remove)
808 ;; We disable package locks here, since defining a class can trigger
809 ;; the update of the accessors of another class -- which might lead
810 ;; to package lock violations if we didn't.
811 (without-package-locks
812 (flet ((fix (gfspec name r/w)
813 (let* ((ll (case r/w (r '(object)) (w '(new-value object))))
814 (gf (if (fboundp gfspec)
815 (ensure-generic-function gfspec)
816 (ensure-generic-function gfspec :lambda-list ll))))
818 (r (if (eq add/remove 'add)
819 (add-reader-method class gf name)
820 (remove-reader-method class gf)))
821 (w (if (eq add/remove 'add)
822 (add-writer-method class gf name)
823 (remove-writer-method class gf)))))))
824 (dolist (dslotd dslotds)
825 (let ((slot-name (slot-definition-name dslotd)))
826 (dolist (r (slot-definition-readers dslotd))
827 (fix r slot-name 'r))
828 (dolist (w (slot-definition-writers dslotd))
829 (fix w slot-name 'w)))))))
831 (defun add-direct-subclasses (class supers)
832 (dolist (super supers)
833 (unless (memq class (class-direct-subclasses class))
834 (add-direct-subclass super class))))
836 (defun remove-direct-subclasses (class supers)
837 (let ((old (class-direct-superclasses class)))
838 (dolist (o (set-difference old supers))
839 (remove-direct-subclass o class))))
841 (defmethod finalize-inheritance ((class std-class))
842 (update-class class t))
844 (defmethod finalize-inheritance ((class forward-referenced-class))
845 ;; FIXME: should we not be thinking a bit about what kinds of error
846 ;; we're throwing? Maybe we need a clos-error type to mix in? Or
847 ;; possibly a forward-referenced-class-error, though that's
848 ;; difficult given e.g. class precedence list calculations...
850 "~@<FINALIZE-INHERITANCE was called on a forward referenced class:~
855 (defun class-has-a-forward-referenced-superclass-p (class)
856 (or (forward-referenced-class-p class)
857 (some #'class-has-a-forward-referenced-superclass-p
858 (class-direct-superclasses class))))
860 ;;; This is called by :after shared-initialize whenever a class is initialized
861 ;;; or reinitialized. The class may or may not be finalized.
862 (defun update-class (class finalizep)
863 ;; Comment from Gerd Moellmann:
865 ;; Note that we can't simply delay the finalization when CLASS has
866 ;; no forward referenced superclasses because that causes bootstrap
868 (without-package-locks
869 (when (and (not finalizep)
870 (not (class-finalized-p class))
871 (not (class-has-a-forward-referenced-superclass-p class)))
872 (finalize-inheritance class)
873 (return-from update-class))
874 (when (or finalizep (class-finalized-p class)
875 (not (class-has-a-forward-referenced-superclass-p class)))
876 (setf (find-class (class-name class)) class)
877 (update-cpl class (compute-class-precedence-list class))
878 ;; This invocation of UPDATE-SLOTS, in practice, finalizes the
879 ;; class. The hoops above are to ensure that FINALIZE-INHERITANCE
880 ;; is called at finalization, so that MOP programmers can hook
881 ;; into the system as described in "Class Finalization Protocol"
882 ;; (section 5.5.2 of AMOP).
883 (update-slots class (compute-slots class))
884 (update-gfs-of-class class)
885 (update-initargs class (compute-default-initargs class))
886 (update-ctors 'finalize-inheritance :class class))
888 (dolist (sub (class-direct-subclasses class)) (update-class sub nil)))))
890 (defun update-cpl (class cpl)
891 (if (class-finalized-p class)
892 (unless (and (equal (class-precedence-list class) cpl)
894 (when (position :class (class-direct-slots c)
895 :key #'slot-definition-allocation)
897 ;; comment from the old CMU CL sources:
898 ;; Need to have the cpl setup before update-lisp-class-layout
899 ;; is called on CMU CL.
900 (setf (slot-value class 'class-precedence-list) cpl)
901 (force-cache-flushes class))
902 (setf (slot-value class 'class-precedence-list) cpl))
903 (update-class-can-precede-p cpl))
905 (defun update-class-can-precede-p (cpl)
907 (let ((first (car cpl)))
908 (dolist (c (cdr cpl))
909 (pushnew c (slot-value first 'can-precede-list))))
910 (update-class-can-precede-p (cdr cpl))))
912 (defun class-can-precede-p (class1 class2)
913 (member class2 (class-can-precede-list class1)))
915 (defun update-slots (class eslotds)
916 (let ((instance-slots ())
918 (dolist (eslotd eslotds)
919 (let ((alloc (slot-definition-allocation eslotd)))
921 (:instance (push eslotd instance-slots))
922 (:class (push eslotd class-slots)))))
924 ;; If there is a change in the shape of the instances then the
925 ;; old class is now obsolete.
926 (let* ((nlayout (mapcar #'slot-definition-name
927 (sort instance-slots #'<
928 :key #'slot-definition-location)))
929 (nslots (length nlayout))
930 (nwrapper-class-slots (compute-class-slots class-slots))
931 (owrapper (when (class-finalized-p class)
932 (class-wrapper class)))
933 (olayout (when owrapper
934 (wrapper-instance-slots-layout owrapper)))
935 (owrapper-class-slots (and owrapper (wrapper-class-slots owrapper)))
937 (cond ((null owrapper)
938 (make-wrapper nslots class))
939 ((and (equal nlayout olayout)
941 (loop for o in owrapper-class-slots
942 for n in nwrapper-class-slots
943 do (unless (eq (car o) (car n)) (return t)))))
946 ;; This will initialize the new wrapper to have the
947 ;; same state as the old wrapper. We will then have
948 ;; to change that. This may seem like wasted work
949 ;; (and it is), but the spec requires that we call
950 ;; MAKE-INSTANCES-OBSOLETE.
951 (make-instances-obsolete class)
952 (class-wrapper class)))))
954 (with-slots (wrapper slots) class
955 (update-lisp-class-layout class nwrapper)
957 (wrapper-instance-slots-layout nwrapper) nlayout
958 (wrapper-class-slots nwrapper) nwrapper-class-slots
959 (wrapper-no-of-instance-slots nwrapper) nslots
961 (setf (slot-value class 'finalized-p) t)
962 (unless (eq owrapper nwrapper)
963 (update-pv-table-cache-info class)
964 (maybe-update-standard-class-locations class)))))
966 (defun compute-class-slots (eslotds)
968 (dolist (eslotd eslotds)
969 (push (assoc (slot-definition-name eslotd)
970 (class-slot-cells (slot-definition-class eslotd)))
974 (defun update-gfs-of-class (class)
975 (when (and (class-finalized-p class)
976 (let ((cpl (class-precedence-list class)))
977 (or (member *the-class-slot-class* cpl)
978 (member *the-class-standard-effective-slot-definition*
980 (let ((gf-table (make-hash-table :test 'eq)))
981 (labels ((collect-gfs (class)
982 (dolist (gf (specializer-direct-generic-functions class))
983 (setf (gethash gf gf-table) t))
984 (mapc #'collect-gfs (class-direct-superclasses class))))
986 (maphash (lambda (gf ignore)
987 (declare (ignore ignore))
988 (update-gf-dfun class gf))
991 (defun update-initargs (class inits)
992 (setf (plist-value class 'default-initargs) inits))
994 (defmethod compute-default-initargs ((class slot-class))
995 (let ((initargs (loop for c in (class-precedence-list class)
996 append (class-direct-default-initargs c))))
997 (delete-duplicates initargs :test #'eq :key #'car :from-end t)))
999 ;;;; protocols for constructing direct and effective slot definitions
1001 (defmethod direct-slot-definition-class ((class std-class) &rest initargs)
1002 (declare (ignore initargs))
1003 (find-class 'standard-direct-slot-definition))
1005 (defun make-direct-slotd (class initargs)
1006 (let ((initargs (list* :class class initargs)))
1007 (apply #'make-instance
1008 (apply #'direct-slot-definition-class class initargs)
1011 (defmethod compute-slots ((class std-class))
1012 ;; As specified, we must call COMPUTE-EFFECTIVE-SLOT-DEFINITION once
1013 ;; for each different slot name we find in our superclasses. Each
1014 ;; call receives the class and a list of the dslotds with that name.
1015 ;; The list is in most-specific-first order.
1016 (let ((name-dslotds-alist ()))
1017 (dolist (c (class-precedence-list class))
1018 (dolist (slot (class-direct-slots c))
1019 (let* ((name (slot-definition-name slot))
1020 (entry (assq name name-dslotds-alist)))
1022 (push slot (cdr entry))
1023 (push (list name slot) name-dslotds-alist)))))
1024 (mapcar (lambda (direct)
1025 (compute-effective-slot-definition class
1027 (nreverse (cdr direct))))
1028 name-dslotds-alist)))
1030 (defmethod compute-slots ((class standard-class))
1033 (defmethod compute-slots :around ((class standard-class))
1034 (let ((eslotds (call-next-method))
1036 (dolist (eslotd eslotds eslotds)
1037 (setf (slot-definition-location eslotd)
1038 (ecase (slot-definition-allocation eslotd)
1042 (let* ((name (slot-definition-name eslotd))
1043 (from-class (slot-definition-allocation-class eslotd))
1044 (cell (assq name (class-slot-cells from-class))))
1046 (if (eq +slot-unbound+ (cdr cell))
1047 ;; We may have inherited an initfunction
1048 (let ((initfun (slot-definition-initfunction eslotd)))
1050 (rplacd cell (funcall initfun))
1053 (initialize-internal-slot-functions eslotd))))
1055 (defmethod compute-slots ((class funcallable-standard-class))
1058 (defmethod compute-slots :around ((class funcallable-standard-class))
1059 (labels ((instance-slot-names (slotds)
1061 (dolist (slotd slotds (nreverse collect))
1062 (when (eq (slot-definition-allocation slotd) :instance)
1063 (push (slot-definition-name slotd) collect)))))
1064 ;; This sorts slots so that slots of classes later in the CPL
1065 ;; come before slots of other classes. This is crucial for
1066 ;; funcallable instances because it ensures that the slots of
1067 ;; FUNCALLABLE-STANDARD-OBJECT, which includes the slots of
1068 ;; KERNEL:FUNCALLABLE-INSTANCE, come first, which in turn
1069 ;; makes it possible to treat FUNCALLABLE-STANDARD-OBJECT as
1070 ;; a funcallable instance.
1071 (compute-layout (eslotds)
1073 (names (instance-slot-names eslotds)))
1075 (reverse (class-precedence-list class))
1076 (nreverse (nconc names first)))
1077 (dolist (ss (class-slots class))
1078 (let ((name (slot-definition-name ss)))
1079 (when (member name names)
1081 (setq names (delete name names)))))))))
1082 (let ((all-slotds (call-next-method))
1085 (dolist (slotd all-slotds)
1086 (ecase (slot-definition-allocation slotd)
1087 (:instance (push slotd instance-slots))
1088 (:class (push slotd class-slots))))
1089 (let ((layout (compute-layout instance-slots)))
1090 (dolist (slotd instance-slots)
1091 (setf (slot-definition-location slotd)
1092 (position (slot-definition-name slotd) layout))
1093 (initialize-internal-slot-functions slotd)))
1094 (dolist (slotd class-slots)
1095 (let ((name (slot-definition-name slotd))
1096 (from-class (slot-definition-allocation-class slotd)))
1097 (setf (slot-definition-location slotd)
1098 (assoc name (class-slot-cells from-class)))
1099 (aver (consp (slot-definition-location slotd)))
1100 (initialize-internal-slot-functions slotd)))
1103 (defmethod compute-slots ((class structure-class))
1104 (mapcan (lambda (superclass)
1105 (mapcar (lambda (dslotd)
1106 (compute-effective-slot-definition
1108 (slot-definition-name dslotd)
1110 (class-direct-slots superclass)))
1111 (reverse (slot-value class 'class-precedence-list))))
1113 (defmethod compute-slots :around ((class structure-class))
1114 (let ((eslotds (call-next-method)))
1115 (mapc #'initialize-internal-slot-functions eslotds)
1118 (defmethod compute-effective-slot-definition ((class slot-class) name dslotds)
1119 (declare (ignore name))
1120 (let* ((initargs (compute-effective-slot-definition-initargs class dslotds))
1121 (class (apply #'effective-slot-definition-class class initargs)))
1122 (apply #'make-instance class initargs)))
1124 (defmethod effective-slot-definition-class ((class std-class) &rest initargs)
1125 (declare (ignore initargs))
1126 (find-class 'standard-effective-slot-definition))
1128 (defmethod effective-slot-definition-class ((class structure-class) &rest initargs)
1129 (declare (ignore initargs))
1130 (find-class 'structure-effective-slot-definition))
1132 (defmethod compute-effective-slot-definition-initargs
1133 ((class slot-class) direct-slotds)
1139 (allocation-class nil)
1145 (dolist (slotd direct-slotds)
1148 (setq name (slot-definition-name slotd)
1151 (when (slot-definition-initfunction slotd)
1152 (setq initform (slot-definition-initform slotd)
1153 initfunction (slot-definition-initfunction slotd)
1156 (setq allocation (slot-definition-allocation slotd)
1157 allocation-class (slot-definition-class slotd)
1159 (setq initargs (append (slot-definition-initargs slotd) initargs))
1160 (let ((slotd-type (slot-definition-type slotd)))
1161 (setq type (cond ((eq type t) slotd-type)
1162 ((*subtypep type slotd-type) type)
1163 (t `(and ,type ,slotd-type)))))))
1166 :initfunction initfunction
1168 :allocation allocation
1169 :allocation-class allocation-class
1173 (defmethod compute-effective-slot-definition-initargs :around
1174 ((class structure-class) direct-slotds)
1175 (let ((slotd (car direct-slotds)))
1176 (list* :defstruct-accessor-symbol
1177 (slot-definition-defstruct-accessor-symbol slotd)
1178 :internal-reader-function
1179 (slot-definition-internal-reader-function slotd)
1180 :internal-writer-function
1181 (slot-definition-internal-writer-function slotd)
1182 (call-next-method))))
1184 ;;; NOTE: For bootstrapping considerations, these can't use MAKE-INSTANCE
1185 ;;; to make the method object. They have to use make-a-method which
1186 ;;; is a specially bootstrapped mechanism for making standard methods.
1187 (defmethod reader-method-class ((class slot-class) direct-slot &rest initargs)
1188 (declare (ignore direct-slot initargs))
1189 (find-class 'standard-reader-method))
1191 (defmethod add-reader-method ((class slot-class) generic-function slot-name)
1192 (add-method generic-function
1193 (make-a-method 'standard-reader-method
1195 (list (or (class-name class) 'object))
1197 (make-reader-method-function class slot-name)
1198 "automatically generated reader method"
1201 (defmethod writer-method-class ((class slot-class) direct-slot &rest initargs)
1202 (declare (ignore direct-slot initargs))
1203 (find-class 'standard-writer-method))
1205 (defmethod add-writer-method ((class slot-class) generic-function slot-name)
1206 (add-method generic-function
1207 (make-a-method 'standard-writer-method
1209 (list 'new-value (or (class-name class) 'object))
1210 (list *the-class-t* class)
1211 (make-writer-method-function class slot-name)
1212 "automatically generated writer method"
1215 (defmethod add-boundp-method ((class slot-class) generic-function slot-name)
1216 (add-method generic-function
1217 (make-a-method 'standard-boundp-method
1219 (list (or (class-name class) 'object))
1221 (make-boundp-method-function class slot-name)
1222 "automatically generated boundp method"
1225 (defmethod remove-reader-method ((class slot-class) generic-function)
1226 (let ((method (get-method generic-function () (list class) nil)))
1227 (when method (remove-method generic-function method))))
1229 (defmethod remove-writer-method ((class slot-class) generic-function)
1231 (get-method generic-function () (list *the-class-t* class) nil)))
1232 (when method (remove-method generic-function method))))
1234 (defmethod remove-boundp-method ((class slot-class) generic-function)
1235 (let ((method (get-method generic-function () (list class) nil)))
1236 (when method (remove-method generic-function method))))
1238 ;;; MAKE-READER-METHOD-FUNCTION and MAKE-WRITE-METHOD function are NOT
1239 ;;; part of the standard protocol. They are however useful, PCL makes
1240 ;;; use of them internally and documents them for PCL users.
1242 ;;; *** This needs work to make type testing by the writer functions which
1243 ;;; *** do type testing faster. The idea would be to have one constructor
1244 ;;; *** for each possible type test.
1246 ;;; *** There is a subtle bug here which is going to have to be fixed.
1247 ;;; *** Namely, the simplistic use of the template has to be fixed. We
1248 ;;; *** have to give the OPTIMIZE-SLOT-VALUE method the user might have
1249 ;;; *** defined for this metaclass a chance to run.
1251 (defmethod make-reader-method-function ((class slot-class) slot-name)
1252 (make-std-reader-method-function (class-name class) slot-name))
1254 (defmethod make-writer-method-function ((class slot-class) slot-name)
1255 (make-std-writer-method-function (class-name class) slot-name))
1257 (defmethod make-boundp-method-function ((class slot-class) slot-name)
1258 (make-std-boundp-method-function (class-name class) slot-name))
1260 (defmethod compatible-meta-class-change-p (class proto-new-class)
1261 (eq (class-of class) (class-of proto-new-class)))
1263 (defmethod validate-superclass ((class class) (new-super class))
1264 (or (eq new-super *the-class-t*)
1265 (eq (class-of class) (class-of new-super))))
1267 (defmethod validate-superclass ((class standard-class) (new-super std-class))
1268 (let ((new-super-meta-class (class-of new-super)))
1269 (or (eq new-super-meta-class *the-class-std-class*)
1270 (eq (class-of class) new-super-meta-class))))
1272 ;;; What this does depends on which of the four possible values of
1273 ;;; LAYOUT-INVALID the PCL wrapper has; the simplest case is when it
1274 ;;; is (:FLUSH <wrapper>) or (:OBSOLETE <wrapper>), when there is
1275 ;;; nothing to do, as the new wrapper has already been created. If
1276 ;;; LAYOUT-INVALID returns NIL, then we invalidate it (setting it to
1277 ;;; (:FLUSH <wrapper>); UPDATE-SLOTS later gets to choose whether or
1278 ;;; not to "upgrade" this to (:OBSOLETE <wrapper>).
1280 ;;; This leaves the case where LAYOUT-INVALID returns T, which happens
1281 ;;; when REGISTER-LAYOUT has invalidated a superclass of CLASS (which
1282 ;;; invalidated all the subclasses in SB-KERNEL land). Again, here we
1283 ;;; must flush the caches and allow UPDATE-SLOTS to decide whether to
1284 ;;; obsolete the wrapper.
1286 ;;; FIXME: either here or in INVALID-WRAPPER-P looks like a good place
1287 ;;; for (AVER (NOT (EQ (LAYOUT-INVALID OWRAPPER)
1288 ;;; :UNINITIALIZED)))
1290 ;;; Thanks to Gerd Moellmann for the explanation. -- CSR, 2002-10-29
1291 (defun force-cache-flushes (class)
1292 (let* ((owrapper (class-wrapper class)))
1293 ;; We only need to do something if the wrapper is still valid. If
1294 ;; the wrapper isn't valid, state will be FLUSH or OBSOLETE, and
1295 ;; both of those will already be doing what we want. In
1296 ;; particular, we must be sure we never change an OBSOLETE into a
1297 ;; FLUSH since OBSOLETE means do what FLUSH does and then some.
1298 (when (or (not (invalid-wrapper-p owrapper))
1299 ;; KLUDGE: despite the observations above, this remains
1300 ;; a violation of locality or what might be considered
1301 ;; good style. There has to be a better way! -- CSR,
1303 (eq (layout-invalid owrapper) t))
1304 (let ((nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper)
1306 (setf (wrapper-instance-slots-layout nwrapper)
1307 (wrapper-instance-slots-layout owrapper))
1308 (setf (wrapper-class-slots nwrapper)
1309 (wrapper-class-slots owrapper))
1311 (update-lisp-class-layout class nwrapper)
1312 (setf (slot-value class 'wrapper) nwrapper)
1313 ;; Use :OBSOLETE instead of :FLUSH if any superclass has
1315 (if (find-if (lambda (x)
1316 (and (consp x) (eq :obsolete (car x))))
1317 (layout-inherits owrapper)
1318 :key #'layout-invalid)
1319 (invalidate-wrapper owrapper :obsolete nwrapper)
1320 (invalidate-wrapper owrapper :flush nwrapper)))))))
1322 (defun flush-cache-trap (owrapper nwrapper instance)
1323 (declare (ignore owrapper))
1324 (set-wrapper instance nwrapper))
1326 ;;; MAKE-INSTANCES-OBSOLETE can be called by user code. It will cause
1327 ;;; the next access to the instance (as defined in 88-002R) to trap
1328 ;;; through the UPDATE-INSTANCE-FOR-REDEFINED-CLASS mechanism.
1329 (defmethod make-instances-obsolete ((class std-class))
1330 (let* ((owrapper (class-wrapper class))
1331 (nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper)
1333 (setf (wrapper-instance-slots-layout nwrapper)
1334 (wrapper-instance-slots-layout owrapper))
1335 (setf (wrapper-class-slots nwrapper)
1336 (wrapper-class-slots owrapper))
1338 (update-lisp-class-layout class nwrapper)
1339 (setf (slot-value class 'wrapper) nwrapper)
1340 (invalidate-wrapper owrapper :obsolete nwrapper)
1343 (defmethod make-instances-obsolete ((class symbol))
1344 (make-instances-obsolete (find-class class))
1345 ;; ANSI wants the class name when called with a symbol.
1348 ;;; OBSOLETE-INSTANCE-TRAP is the internal trap that is called when we
1349 ;;; see an obsolete instance. The times when it is called are:
1350 ;;; - when the instance is involved in method lookup
1351 ;;; - when attempting to access a slot of an instance
1353 ;;; It is not called by class-of, wrapper-of, or any of the low-level
1354 ;;; instance access macros.
1356 ;;; Of course these times when it is called are an internal
1357 ;;; implementation detail of PCL and are not part of the documented
1358 ;;; description of when the obsolete instance update happens. The
1359 ;;; documented description is as it appears in 88-002R.
1361 ;;; This has to return the new wrapper, so it counts on all the
1362 ;;; methods on obsolete-instance-trap-internal to return the new
1363 ;;; wrapper. It also does a little internal error checking to make
1364 ;;; sure that the traps are only happening when they should, and that
1365 ;;; the trap methods are computing appropriate new wrappers.
1367 ;;; OBSOLETE-INSTANCE-TRAP might be called on structure instances
1368 ;;; after a structure is redefined. In most cases,
1369 ;;; OBSOLETE-INSTANCE-TRAP will not be able to fix the old instance,
1370 ;;; so it must signal an error. The hard part of this is that the
1371 ;;; error system and debugger might cause OBSOLETE-INSTANCE-TRAP to be
1372 ;;; called again, so in that case, we have to return some reasonable
1373 ;;; wrapper, instead.
1375 (defvar *in-obsolete-instance-trap* nil)
1376 (defvar *the-wrapper-of-structure-object*
1377 (class-wrapper (find-class 'structure-object)))
1379 (define-condition obsolete-structure (error)
1380 ((datum :reader obsolete-structure-datum :initarg :datum))
1382 (lambda (condition stream)
1383 ;; Don't try to print the structure, since it probably won't work.
1385 "~@<obsolete structure error for a structure of type ~2I~_~S~:>"
1386 (type-of (obsolete-structure-datum condition))))))
1388 (defun obsolete-instance-trap (owrapper nwrapper instance)
1389 (if (not (pcl-instance-p instance))
1390 (if *in-obsolete-instance-trap*
1391 *the-wrapper-of-structure-object*
1392 (let ((*in-obsolete-instance-trap* t))
1393 (error 'obsolete-structure :datum instance)))
1394 (let* ((class (wrapper-class* nwrapper))
1395 (copy (allocate-instance class)) ;??? allocate-instance ???
1396 (olayout (wrapper-instance-slots-layout owrapper))
1397 (nlayout (wrapper-instance-slots-layout nwrapper))
1398 (oslots (get-slots instance))
1399 (nslots (get-slots copy))
1400 (oclass-slots (wrapper-class-slots owrapper))
1405 ;; local --> local transfer value
1406 ;; local --> shared discard value, discard slot
1407 ;; local --> -- discard slot
1408 ;; shared --> local transfer value
1409 ;; shared --> shared -- (cf SHARED-INITIALIZE :AFTER STD-CLASS)
1410 ;; shared --> -- discard value
1411 ;; -- --> local add slot
1414 ;; Collect class slots from inherited wrappers. Needed for
1415 ;; shared -> local transfers of inherited slots.
1416 (let ((inherited (layout-inherits owrapper)))
1417 (loop for i from (1- (length inherited)) downto 0
1418 for layout = (aref inherited i)
1419 when (typep layout 'wrapper)
1420 do (dolist (slot (wrapper-class-slots layout))
1421 (pushnew slot oclass-slots :key #'car))))
1423 ;; Go through all the old local slots.
1425 (dolist (name olayout)
1426 (let ((npos (posq name nlayout)))
1428 (setf (clos-slots-ref nslots npos)
1429 (clos-slots-ref oslots opos))
1431 (push name discarded)
1432 (unless (eq (clos-slots-ref oslots opos) +slot-unbound+)
1433 (setf (getf plist name) (clos-slots-ref oslots opos))))))
1436 ;; Go through all the old shared slots.
1437 (dolist (oclass-slot-and-val oclass-slots)
1438 (let ((name (car oclass-slot-and-val))
1439 (val (cdr oclass-slot-and-val)))
1440 (let ((npos (posq name nlayout)))
1442 (setf (clos-slots-ref nslots npos) val)))))
1444 ;; Go through all the new local slots to compute the added slots.
1445 (dolist (nlocal nlayout)
1446 (unless (or (memq nlocal olayout)
1447 (assq nlocal oclass-slots))
1448 (push nlocal added)))
1450 (swap-wrappers-and-slots instance copy)
1452 (update-instance-for-redefined-class instance
1458 (defun change-class-internal (instance new-class initargs)
1459 (let* ((old-class (class-of instance))
1460 (copy (allocate-instance new-class))
1461 (new-wrapper (get-wrapper copy))
1462 (old-wrapper (class-wrapper old-class))
1463 (old-layout (wrapper-instance-slots-layout old-wrapper))
1464 (new-layout (wrapper-instance-slots-layout new-wrapper))
1465 (old-slots (get-slots instance))
1466 (new-slots (get-slots copy))
1467 (old-class-slots (wrapper-class-slots old-wrapper)))
1469 ;; "The values of local slots specified by both the class CTO and
1470 ;; CFROM are retained. If such a local slot was unbound, it
1471 ;; remains unbound."
1472 (let ((new-position 0))
1473 (dolist (new-slot new-layout)
1474 (let ((old-position (posq new-slot old-layout)))
1476 (setf (clos-slots-ref new-slots new-position)
1477 (clos-slots-ref old-slots old-position))))
1478 (incf new-position)))
1480 ;; "The values of slots specified as shared in the class CFROM and
1481 ;; as local in the class CTO are retained."
1482 (dolist (slot-and-val old-class-slots)
1483 (let ((position (posq (car slot-and-val) new-layout)))
1485 (setf (clos-slots-ref new-slots position) (cdr slot-and-val)))))
1487 ;; Make the copy point to the old instance's storage, and make the
1488 ;; old instance point to the new storage.
1489 (swap-wrappers-and-slots instance copy)
1491 (apply #'update-instance-for-different-class copy instance initargs)
1494 (defmethod change-class ((instance standard-object)
1495 (new-class standard-class)
1497 (change-class-internal instance new-class initargs))
1499 (defmethod change-class ((instance funcallable-standard-object)
1500 (new-class funcallable-standard-class)
1502 (change-class-internal instance new-class initargs))
1504 (defmethod change-class ((instance standard-object)
1505 (new-class funcallable-standard-class)
1507 (declare (ignore initargs))
1508 (error "You can't change the class of ~S to ~S~@
1509 because it isn't already an instance with metaclass ~S."
1510 instance new-class 'standard-class))
1512 (defmethod change-class ((instance funcallable-standard-object)
1513 (new-class standard-class)
1515 (declare (ignore initargs))
1516 (error "You can't change the class of ~S to ~S~@
1517 because it isn't already an instance with metaclass ~S."
1518 instance new-class 'funcallable-standard-class))
1520 (defmethod change-class ((instance t) (new-class-name symbol) &rest initargs)
1521 (apply #'change-class instance (find-class new-class-name) initargs))
1523 ;;;; The metaclass BUILT-IN-CLASS
1525 ;;;; This metaclass is something of a weird creature. By this point, all
1526 ;;;; instances of it which will exist have been created, and no instance
1527 ;;;; is ever created by calling MAKE-INSTANCE.
1529 ;;;; But, there are other parts of the protocol we must follow and those
1530 ;;;; definitions appear here.
1532 (defmethod shared-initialize :before
1533 ((class built-in-class) slot-names &rest initargs)
1534 (declare (ignore slot-names initargs))
1535 (error "attempt to initialize or reinitialize a built in class"))
1537 (defmethod class-direct-slots ((class built-in-class)) ())
1538 (defmethod class-slots ((class built-in-class)) ())
1539 (defmethod class-direct-default-initargs ((class built-in-class)) ())
1540 (defmethod class-default-initargs ((class built-in-class)) ())
1542 (defmethod validate-superclass ((c class) (s built-in-class))
1543 (or (eq s *the-class-t*)
1544 (eq s *the-class-stream*)))
1546 ;;; Some necessary methods for FORWARD-REFERENCED-CLASS
1547 (defmethod class-direct-slots ((class forward-referenced-class)) ())
1548 (defmethod class-direct-default-initargs ((class forward-referenced-class)) ())
1549 (macrolet ((def (method)
1550 `(defmethod ,method ((class forward-referenced-class))
1551 (error "~@<~I~S was called on a forward referenced class:~2I~_~S~:>"
1553 (def class-default-initargs)
1554 (def class-precedence-list)
1557 (defmethod validate-superclass ((c slot-class)
1558 (f forward-referenced-class))
1561 (defmethod add-dependent ((metaobject dependent-update-mixin) dependent)
1562 (pushnew dependent (plist-value metaobject 'dependents)))
1564 (defmethod remove-dependent ((metaobject dependent-update-mixin) dependent)
1565 (setf (plist-value metaobject 'dependents)
1566 (delete dependent (plist-value metaobject 'dependents))))
1568 (defmethod map-dependents ((metaobject dependent-update-mixin) function)
1569 (dolist (dependent (plist-value metaobject 'dependents))
1570 (funcall function dependent)))