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 :before
(class)
125 (unless (class-finalized-p class
)
126 (error "~S not yet finalized, cannot allocate a prototype." class
)))
128 ;;; KLUDGE: For some reason factoring the common body into a function
129 ;;; breaks PCL bootstrapping, so just generate it with a macrolet for
131 (macrolet ((def (class)
132 `(defmethod class-prototype ((class ,class
))
133 (with-slots (prototype) class
135 (setf prototype
(allocate-instance class
)))))))
137 (def condition-class
)
138 (def structure-class
))
140 (defmethod class-direct-default-initargs ((class slot-class
))
141 (plist-value class
'direct-default-initargs
))
143 (defmethod class-default-initargs ((class slot-class
))
144 (plist-value class
'default-initargs
))
146 (defmethod class-slot-cells ((class std-class
))
147 (plist-value class
'class-slot-cells
))
148 (defmethod (setf class-slot-cells
) (new-value (class std-class
))
149 (setf (plist-value class
'class-slot-cells
) new-value
))
151 ;;;; class accessors that are even a little bit more complicated than those
152 ;;;; above. These have a protocol for updating them, we must implement that
155 ;;; Maintaining the direct subclasses backpointers. The update methods are
156 ;;; here, the values are read by an automatically generated reader method.
157 (defmethod add-direct-subclass ((class class
) (subclass class
))
158 (with-slots (direct-subclasses) class
159 (pushnew subclass direct-subclasses
)
161 (defmethod remove-direct-subclass ((class class
) (subclass class
))
162 (with-slots (direct-subclasses) class
163 (setq direct-subclasses
(remove subclass direct-subclasses
))
166 ;;; Maintaining the direct-methods and direct-generic-functions backpointers.
168 ;;; There are four generic functions involved, each has one method for the
169 ;;; class case and another method for the damned EQL specializers. All of
170 ;;; these are specified methods and appear in their specified place in the
173 ;;; ADD-DIRECT-METHOD
174 ;;; REMOVE-DIRECT-METHOD
175 ;;; SPECIALIZER-DIRECT-METHODS
176 ;;; SPECIALIZER-DIRECT-GENERIC-FUNCTIONS
178 ;;; In each case, we maintain one value which is a cons. The car is the list
179 ;;; methods. The cdr is a list of the generic functions. The cdr is always
181 (defmethod add-direct-method ((specializer class
) (method method
))
182 (with-slots (direct-methods) specializer
183 (setf (car direct-methods
) (adjoin method
(car direct-methods
)) ;PUSH
184 (cdr direct-methods
) ()))
186 (defmethod remove-direct-method ((specializer class
) (method method
))
187 (with-slots (direct-methods) specializer
188 (setf (car direct-methods
) (remove method
(car direct-methods
))
189 (cdr direct-methods
) ()))
192 (defmethod specializer-direct-methods ((specializer class
))
193 (with-slots (direct-methods) specializer
194 (car direct-methods
)))
196 (defmethod specializer-direct-generic-functions ((specializer class
))
197 (with-slots (direct-methods) specializer
198 (or (cdr direct-methods
)
199 (setf (cdr direct-methods
)
201 (dolist (m (car direct-methods
))
202 ;; the old PCL code used COLLECTING-ONCE which used
203 ;; #'EQ to check for newness
204 (pushnew (method-generic-function m
) collect
:test
#'eq
))
205 (nreverse collect
))))))
207 ;;; This hash table is used to store the direct methods and direct generic
208 ;;; functions of EQL specializers. Each value in the table is the cons.
209 (defvar *eql-specializer-methods
* (make-hash-table :test
'eql
))
210 (defvar *class-eq-specializer-methods
* (make-hash-table :test
'eq
))
212 (defmethod specializer-method-table ((specializer eql-specializer
))
213 *eql-specializer-methods
*)
215 (defmethod specializer-method-table ((specializer class-eq-specializer
))
216 *class-eq-specializer-methods
*)
218 (defmethod add-direct-method ((specializer specializer-with-object
)
220 (let* ((object (specializer-object specializer
))
221 (table (specializer-method-table specializer
))
222 (entry (gethash object table
)))
225 (setf (gethash object table
)
227 (setf (car entry
) (adjoin method
(car entry
))
231 (defmethod remove-direct-method ((specializer specializer-with-object
)
233 (let* ((object (specializer-object specializer
))
234 (entry (gethash object
(specializer-method-table specializer
))))
236 (setf (car entry
) (remove method
(car entry
))
240 (defmethod specializer-direct-methods ((specializer specializer-with-object
))
241 (car (gethash (specializer-object specializer
)
242 (specializer-method-table specializer
))))
244 (defmethod specializer-direct-generic-functions ((specializer
245 specializer-with-object
))
246 (let* ((object (specializer-object specializer
))
247 (entry (gethash object
(specializer-method-table specializer
))))
252 (dolist (m (car entry
))
253 (pushnew (method-generic-function m
) collect
:test
#'eq
))
254 (nreverse collect
)))))))
256 (defun map-specializers (function)
257 (map-all-classes (lambda (class)
258 (funcall function
(class-eq-specializer class
))
259 (funcall function class
)))
260 (maphash (lambda (object methods
)
261 (declare (ignore methods
))
262 (intern-eql-specializer object
))
263 *eql-specializer-methods
*)
264 (maphash (lambda (object specl
)
265 (declare (ignore object
))
266 (funcall function specl
))
267 *eql-specializer-table
*)
270 (defun map-all-generic-functions (function)
271 (let ((all-generic-functions (make-hash-table :test
'eq
)))
272 (map-specializers (lambda (specl)
273 (dolist (gf (specializer-direct-generic-functions
275 (unless (gethash gf all-generic-functions
)
276 (setf (gethash gf all-generic-functions
) t
)
277 (funcall function gf
))))))
280 (defmethod shared-initialize :after
((specl class-eq-specializer
)
283 (declare (ignore slot-names
))
284 (setf (slot-value specl
'type
) `(class-eq ,(specializer-class specl
))))
286 (defmethod shared-initialize :after
((specl eql-specializer
) slot-names
&key
)
287 (declare (ignore slot-names
))
288 (setf (slot-value specl
'type
)
289 `(eql ,(specializer-object specl
)))
290 (setf (info :type
:translator specl
)
291 (constantly (make-member-type :members
(list (specializer-object specl
))))))
293 (defun real-load-defclass (name metaclass-name supers slots other
294 readers writers slot-names
)
295 (with-single-package-locked-error (:symbol name
"defining ~S as a class")
296 (%compiler-defclass name readers writers slot-names
)
297 (let ((res (apply #'ensure-class name
:metaclass metaclass-name
298 :direct-superclasses supers
300 :definition-source
`((defclass ,name
)
305 (setf (gdefinition 'load-defclass
) #'real-load-defclass
)
307 (defun ensure-class (name &rest args
)
308 (apply #'ensure-class-using-class
309 (let ((class (find-class name nil
)))
310 (when (and class
(eq name
(class-name class
)))
311 ;; NAME is the proper name of CLASS, so redefine it
316 (defmethod ensure-class-using-class ((class null
) name
&rest args
&key
)
317 (multiple-value-bind (meta initargs
)
318 (ensure-class-values class args
)
319 (set-class-type-translation (class-prototype meta
) name
)
320 (setf class
(apply #'make-instance meta
:name name initargs
))
321 (without-package-locks
322 (setf (find-class name
) class
))
323 (set-class-type-translation class name
)
326 (defmethod ensure-class-using-class ((class pcl-class
) name
&rest args
&key
)
327 (multiple-value-bind (meta initargs
)
328 (ensure-class-values class args
)
329 (unless (eq (class-of class
) meta
)
330 (apply #'change-class class meta initargs
))
331 (apply #'reinitialize-instance class initargs
)
332 (without-package-locks
333 (setf (find-class name
) class
))
334 (set-class-type-translation class name
)
337 (defmethod class-predicate-name ((class t
))
342 ((not (legal-class-name-p s
))
343 (error "~S is not a class or a legal class name." s
))
345 (or (find-class s nil
)
346 (make-instance 'forward-referenced-class
349 (defun ensure-class-values (class initargs
)
350 (let (metaclass metaclassp reversed-plist
)
351 (doplist (key val
) initargs
352 (cond ((eq key
:metaclass
)
356 (when (eq key
:direct-superclasses
)
357 (setf val
(mapcar #'fix-super val
)))
358 (setf reversed-plist
(list* val key reversed-plist
)))))
359 (values (cond (metaclassp
360 (if (classp metaclass
)
362 (find-class metaclass
)))
363 ((or (null class
) (forward-referenced-class-p class
))
364 *the-class-standard-class
*)
367 (nreverse reversed-plist
))))
370 (defmethod shared-initialize :after
373 &key
(direct-superclasses nil direct-superclasses-p
)
374 (direct-slots nil direct-slots-p
)
375 (direct-default-initargs nil direct-default-initargs-p
)
376 (predicate-name nil predicate-name-p
))
377 (cond (direct-superclasses-p
378 (setq direct-superclasses
379 (or direct-superclasses
380 (list (if (funcallable-standard-class-p class
)
381 *the-class-funcallable-standard-object
*
382 *the-class-standard-object
*))))
383 (dolist (superclass direct-superclasses
)
384 (unless (validate-superclass class superclass
)
385 (error "The class ~S was specified as a~%
386 super-class of the class ~S;~%~
387 but the meta-classes ~S and~%~S are incompatible.~@
388 Define a method for ~S to avoid this error."
389 superclass class
(class-of superclass
) (class-of class
)
390 'validate-superclass
)))
391 (setf (slot-value class
'direct-superclasses
) direct-superclasses
))
393 (setq direct-superclasses
(slot-value class
'direct-superclasses
))))
396 (setf (slot-value class
'direct-slots
)
397 (mapcar (lambda (pl) (make-direct-slotd class pl
))
399 (slot-value class
'direct-slots
)))
400 (if direct-default-initargs-p
401 (setf (plist-value class
'direct-default-initargs
)
402 direct-default-initargs
)
403 (setq direct-default-initargs
404 (plist-value class
'direct-default-initargs
)))
405 (setf (plist-value class
'class-slot-cells
)
406 (let ((old-class-slot-cells (plist-value class
'class-slot-cells
))
408 (dolist (dslotd direct-slots
)
409 (when (eq :class
(slot-definition-allocation dslotd
))
411 (let* ((name (slot-definition-name dslotd
))
412 (old (assoc name old-class-slot-cells
)))
415 (member name slot-names
))
416 (let* ((initfunction (slot-definition-initfunction dslotd
))
417 (value (if initfunction
418 (funcall initfunction
)
420 (push (cons name value
) collect
))
421 (push old collect
)))))
423 (setq predicate-name
(if predicate-name-p
424 (setf (slot-value class
'predicate-name
)
425 (car predicate-name
))
426 (or (slot-value class
'predicate-name
)
427 (setf (slot-value class
'predicate-name
)
428 (make-class-predicate-name (class-name
430 (add-direct-subclasses class direct-superclasses
)
431 (make-class-predicate class predicate-name
)
432 (update-class class nil
)
433 (do* ((slots (slot-value class
'slots
) (cdr slots
))
435 ((null slots
) (when dupes
437 ;; FIXME: the indentation request ("~4I")
438 ;; below appears not to do anything. Finding
439 ;; out why would be nice. -- CSR, 2003-04-24
440 "~@<slot names with the same SYMBOL-NAME but ~
441 different SYMBOL-PACKAGE (possible package problem) ~
442 for class ~S:~@:_~4I~<~@{~S~^~:@_~}~:>~@:>"
445 (let* ((slot (car slots
))
446 (oslots (remove (slot-definition-name slot
) (cdr slots
)
447 :test
#'string
/= :key
#'slot-definition-name
)))
449 (pushnew (cons (slot-definition-name slot
)
450 (mapcar #'slot-definition-name oslots
))
452 :test
#'string
= :key
#'car
))))
453 (add-slot-accessors class direct-slots
)
454 (make-preliminary-layout class
))
456 (defmethod shared-initialize :after
((class forward-referenced-class
)
457 slot-names
&key
&allow-other-keys
)
458 (declare (ignore slot-names
))
459 (make-preliminary-layout class
))
461 (defvar *allow-forward-referenced-classes-in-cpl-p
* nil
)
463 ;;; Give CLASS a preliminary layout if it doesn't have one already, to
464 ;;; make it known to the type system.
465 (defun make-preliminary-layout (class)
466 (flet ((compute-preliminary-cpl (root)
467 (let ((*allow-forward-referenced-classes-in-cpl-p
* t
))
468 (compute-class-precedence-list root
))))
469 (without-package-locks
470 (unless (class-finalized-p class
)
471 (let ((name (class-name class
)))
472 (setf (find-class name
) class
)
473 ;; KLUDGE: This is fairly horrible. We need to make a
474 ;; full-fledged CLASSOID here, not just tell the compiler that
475 ;; some class is forthcoming, because there are legitimate
476 ;; questions one can ask of the type system, implemented in
477 ;; terms of CLASSOIDs, involving forward-referenced classes. So.
478 (when (and (eq *boot-state
* 'complete
)
479 (null (find-classoid name nil
)))
480 (setf (find-classoid name
)
481 (make-standard-classoid :name name
)))
482 (set-class-type-translation class name
)
483 (let ((layout (make-wrapper 0 class
))
484 (classoid (find-classoid name
)))
485 (setf (layout-classoid layout
) classoid
)
486 (setf (classoid-pcl-class classoid
) class
)
487 (setf (slot-value class
'wrapper
) layout
)
488 (let ((cpl (compute-preliminary-cpl class
)))
489 (setf (layout-inherits layout
)
490 (order-layout-inherits
491 (map 'simple-vector
#'class-wrapper
492 (reverse (rest cpl
))))))
493 (register-layout layout
:invalidate t
)
494 (setf (classoid-layout classoid
) layout
)
495 (mapc #'make-preliminary-layout
(class-direct-subclasses class
))))))))
498 (defmethod shared-initialize :before
((class class
) slot-names
&key name
)
499 (declare (ignore slot-names name
))
500 ;; FIXME: Could this just be CLASS instead of `(CLASS ,CLASS)? If not,
501 ;; why not? (See also similar expression in !BOOTSTRAP-INITIALIZE-CLASS.)
502 (setf (slot-value class
'type
) `(class ,class
))
503 (setf (slot-value class
'class-eq-specializer
)
504 (make-instance 'class-eq-specializer
:class class
)))
506 (defmethod reinitialize-instance :before
((class slot-class
) &key direct-superclasses
)
507 (dolist (old-super (set-difference (class-direct-superclasses class
) direct-superclasses
))
508 (remove-direct-subclass old-super class
))
509 (remove-slot-accessors class
(class-direct-slots class
)))
511 (defmethod reinitialize-instance :after
((class slot-class
)
514 (map-dependents class
516 (apply #'update-dependent class dependent initargs
))))
518 (defmethod shared-initialize :after
((class condition-class
) slot-names
519 &key direct-slots direct-superclasses
)
520 (declare (ignore slot-names
))
521 (let ((classoid (find-classoid (class-name class
))))
522 (with-slots (wrapper class-precedence-list cpl-available-p
523 prototype predicate-name
524 (direct-supers direct-superclasses
))
526 (setf (slot-value class
'direct-slots
)
527 (mapcar (lambda (pl) (make-direct-slotd class pl
))
529 (setf (slot-value class
'finalized-p
) t
)
530 (setf (classoid-pcl-class classoid
) class
)
531 (setq direct-supers direct-superclasses
)
532 (setq wrapper
(classoid-layout classoid
))
533 (setq class-precedence-list
(compute-class-precedence-list class
))
534 (setq cpl-available-p t
)
535 (add-direct-subclasses class direct-superclasses
)
536 (setq predicate-name
(make-class-predicate-name (class-name class
)))
537 (make-class-predicate class predicate-name
)
538 (setf (slot-value class
'slots
) (compute-slots class
))))
539 ;; Comment from Gerd's PCL, 2003-05-15:
541 ;; We don't ADD-SLOT-ACCESSORS here because we don't want to
542 ;; override condition accessors with generic functions. We do this
544 (update-pv-table-cache-info class
))
546 (defmethod direct-slot-definition-class ((class condition-class
)
548 (declare (ignore initargs
))
549 (find-class 'condition-direct-slot-definition
))
551 (defmethod effective-slot-definition-class ((class condition-class
)
553 (declare (ignore initargs
))
554 (find-class 'condition-effective-slot-definition
))
556 (defmethod finalize-inheritance ((class condition-class
))
557 (aver (slot-value class
'finalized-p
))
560 (defmethod compute-effective-slot-definition
561 ((class condition-class
) slot-name dslotds
)
562 (let ((slotd (call-next-method)))
563 (setf (slot-definition-reader-function slotd
)
565 (handler-case (condition-reader-function x slot-name
)
566 ;; FIXME: FIND-SLOT-DEFAULT throws an error if the slot
567 ;; is unbound; maybe it should be a CELL-ERROR of some
569 (error () (values (slot-unbound class x slot-name
))))))
570 (setf (slot-definition-writer-function slotd
)
572 (condition-writer-function x v slot-name
)))
573 (setf (slot-definition-boundp-function slotd
)
575 (multiple-value-bind (v c
)
576 (ignore-errors (condition-reader-function x slot-name
))
581 (defmethod compute-slots ((class condition-class
))
582 (mapcan (lambda (superclass)
583 (mapcar (lambda (dslotd)
584 (compute-effective-slot-definition
585 class
(slot-definition-name dslotd
) (list dslotd
)))
586 (class-direct-slots superclass
)))
587 (reverse (slot-value class
'class-precedence-list
))))
589 (defmethod compute-slots :around
((class condition-class
))
590 (let ((eslotds (call-next-method)))
591 (mapc #'initialize-internal-slot-functions eslotds
)
594 (defmethod shared-initialize :after
595 ((slotd structure-slot-definition
) slot-names
&key
596 (allocation :instance
) allocation-class
)
597 (declare (ignore slot-names allocation-class
))
598 (unless (eq allocation
:instance
)
599 (error "Structure slots must have :INSTANCE allocation.")))
601 (defun make-structure-class-defstruct-form (name direct-slots include
)
602 (let* ((conc-name (format-symbol *package
* "~S structure class " name
))
603 (constructor (format-symbol *package
* "~Aconstructor" conc-name
))
604 (defstruct `(defstruct (,name
606 `((:include
,(class-name include
))))
608 (:conc-name
,conc-name
)
609 (:constructor
,constructor
())
611 ,@(mapcar (lambda (slot)
612 `(,(slot-definition-name slot
)
615 (reader-names (mapcar (lambda (slotd)
616 (list 'slot-accessor name
617 (slot-definition-name slotd
)
620 (writer-names (mapcar (lambda (slotd)
621 (list 'slot-accessor name
622 (slot-definition-name slotd
)
626 (mapcar (lambda (slotd reader-name
)
628 (slot-definition-defstruct-accessor-symbol
630 `(defun ,reader-name
(obj)
631 (declare (type ,name obj
))
633 direct-slots reader-names
))
635 (mapcar (lambda (slotd writer-name
)
637 (slot-definition-defstruct-accessor-symbol
639 `(defun ,writer-name
(nv obj
)
640 (declare (type ,name obj
))
641 (setf (,accessor obj
) nv
))))
642 direct-slots writer-names
))
646 ,@readers-init
,@writers-init
648 (values defstruct-form constructor reader-names writer-names
)))
650 (defun make-defstruct-allocation-function (class)
651 (let ((dd (get-structure-dd (class-name class
))))
653 (sb-kernel::%make-instance-with-layout
654 (sb-kernel::compiler-layout-or-lose
(dd-name dd
))))))
656 (defmethod shared-initialize :after
657 ((class structure-class
)
659 &key
(direct-superclasses nil direct-superclasses-p
)
660 (direct-slots nil direct-slots-p
)
661 direct-default-initargs
662 (predicate-name nil predicate-name-p
))
663 (declare (ignore slot-names direct-default-initargs
))
664 (if direct-superclasses-p
665 (setf (slot-value class
'direct-superclasses
)
666 (or direct-superclasses
667 (setq direct-superclasses
668 (and (not (eq (class-name class
) 'structure-object
))
669 (list *the-class-structure-object
*)))))
670 (setq direct-superclasses
(slot-value class
'direct-superclasses
)))
671 (let* ((name (class-name class
))
672 (from-defclass-p (slot-value class
'from-defclass-p
))
673 (defstruct-p (or from-defclass-p
(not (structure-type-p name
)))))
675 (setf (slot-value class
'direct-slots
)
679 (let* ((slot-name (getf pl
:name
))
681 (format-symbol *package
*
682 "~S structure class ~A"
684 (setq pl
(list* :defstruct-accessor-symbol
686 (make-direct-slotd class pl
))
688 (setq direct-slots
(slot-value class
'direct-slots
)))
690 (let ((include (car (slot-value class
'direct-superclasses
))))
691 (multiple-value-bind (defstruct-form constructor reader-names writer-names
)
692 (make-structure-class-defstruct-form name direct-slots include
)
693 (unless (structure-type-p name
) (eval defstruct-form
))
694 (mapc (lambda (dslotd reader-name writer-name
)
695 (let* ((reader (gdefinition reader-name
))
696 (writer (when (gboundp writer-name
)
697 (gdefinition writer-name
))))
698 (setf (slot-value dslotd
'internal-reader-function
)
700 (setf (slot-value dslotd
'internal-writer-function
)
702 direct-slots reader-names writer-names
)
703 (setf (slot-value class
'defstruct-form
) defstruct-form
)
704 (setf (slot-value class
'defstruct-constructor
) constructor
)))
705 (setf (slot-value class
'defstruct-constructor
)
706 (make-defstruct-allocation-function class
)))
707 (add-direct-subclasses class direct-superclasses
)
708 (setf (slot-value class
'class-precedence-list
)
709 (compute-class-precedence-list class
))
710 (setf (slot-value class
'cpl-available-p
) t
)
711 (setf (slot-value class
'slots
) (compute-slots class
))
712 (let ((lclass (find-classoid (class-name class
))))
713 (setf (classoid-pcl-class lclass
) class
)
714 (setf (slot-value class
'wrapper
) (classoid-layout lclass
)))
715 (setf (slot-value class
'finalized-p
) t
)
716 (update-pv-table-cache-info class
)
717 (setq predicate-name
(if predicate-name-p
718 (setf (slot-value class
'predicate-name
)
719 (car predicate-name
))
720 (or (slot-value class
'predicate-name
)
721 (setf (slot-value class
'predicate-name
)
722 (make-class-predicate-name
723 (class-name class
))))))
724 (make-class-predicate class predicate-name
)
725 (add-slot-accessors class direct-slots
)))
727 (defmethod direct-slot-definition-class ((class structure-class
) &rest initargs
)
728 (declare (ignore initargs
))
729 (find-class 'structure-direct-slot-definition
))
731 (defmethod finalize-inheritance ((class structure-class
))
732 nil
) ; always finalized
734 (defun add-slot-accessors (class dslotds
)
735 (fix-slot-accessors class dslotds
'add
))
737 (defun remove-slot-accessors (class dslotds
)
738 (fix-slot-accessors class dslotds
'remove
))
740 (defun fix-slot-accessors (class dslotds add
/remove
)
741 (flet ((fix (gfspec name r
/w
)
742 (let ((gf (cond ((eq add
/remove
'add
)
744 (without-package-locks
745 (ensure-generic-function gfspec
))
746 (ensure-generic-function
747 gfspec
:lambda-list
(case r
/w
749 (w '(new-value object
))))))
750 ((generic-function-p (and (fboundp gfspec
)
751 (fdefinition gfspec
)))
752 (without-package-locks
753 (ensure-generic-function gfspec
))))))
756 (r (if (eq add
/remove
'add
)
757 (add-reader-method class gf name
)
758 (remove-reader-method class gf
)))
759 (w (if (eq add
/remove
'add
)
760 (add-writer-method class gf name
)
761 (remove-writer-method class gf
))))))))
762 (dolist (dslotd dslotds
)
763 (let ((slot-name (slot-definition-name dslotd
)))
764 (dolist (r (slot-definition-readers dslotd
))
765 (fix r slot-name
'r
))
766 (dolist (w (slot-definition-writers dslotd
))
767 (fix w slot-name
'w
))))))
769 (defun add-direct-subclasses (class supers
)
770 (dolist (super supers
)
771 (unless (memq class
(class-direct-subclasses class
))
772 (add-direct-subclass super class
))))
774 (defmethod finalize-inheritance ((class std-class
))
775 (update-class class t
))
777 (defmethod finalize-inheritance ((class forward-referenced-class
))
778 ;; FIXME: should we not be thinking a bit about what kinds of error
779 ;; we're throwing? Maybe we need a clos-error type to mix in? Or
780 ;; possibly a forward-referenced-class-error, though that's
781 ;; difficult given e.g. class precedence list calculations...
783 "~@<FINALIZE-INHERITANCE was called on a forward referenced class:~
788 (defun class-has-a-forward-referenced-superclass-p (class)
789 (or (forward-referenced-class-p class
)
790 (some #'class-has-a-forward-referenced-superclass-p
791 (class-direct-superclasses class
))))
793 ;;; This is called by :after shared-initialize whenever a class is initialized
794 ;;; or reinitialized. The class may or may not be finalized.
795 (defun update-class (class finalizep
)
796 ;; Comment from Gerd Moellmann:
798 ;; Note that we can't simply delay the finalization when CLASS has
799 ;; no forward referenced superclasses because that causes bootstrap
801 (without-package-locks
802 (when (and (not finalizep
)
803 (not (class-finalized-p class
))
804 (not (class-has-a-forward-referenced-superclass-p class
)))
805 (finalize-inheritance class
)
806 (return-from update-class
))
807 (when (or finalizep
(class-finalized-p class
)
808 (not (class-has-a-forward-referenced-superclass-p class
)))
809 (setf (find-class (class-name class
)) class
)
810 (update-cpl class
(compute-class-precedence-list class
))
811 ;; This invocation of UPDATE-SLOTS, in practice, finalizes the
812 ;; class. The hoops above are to ensure that FINALIZE-INHERITANCE
813 ;; is called at finalization, so that MOP programmers can hook
814 ;; into the system as described in "Class Finalization Protocol"
815 ;; (section 5.5.2 of AMOP).
816 (update-slots class
(compute-slots class
))
817 (update-gfs-of-class class
)
818 (update-initargs class
(compute-default-initargs class
))
819 (update-ctors 'finalize-inheritance
:class class
))
821 (dolist (sub (class-direct-subclasses class
)) (update-class sub nil
)))))
823 (defun update-cpl (class cpl
)
824 (if (class-finalized-p class
)
825 (unless (and (equal (class-precedence-list class
) cpl
)
827 (when (position :class
(class-direct-slots c
)
828 :key
#'slot-definition-allocation
)
830 ;; comment from the old CMU CL sources:
831 ;; Need to have the cpl setup before update-lisp-class-layout
832 ;; is called on CMU CL.
833 (setf (slot-value class
'class-precedence-list
) cpl
)
834 (setf (slot-value class
'cpl-available-p
) t
)
835 (force-cache-flushes class
))
837 (setf (slot-value class
'class-precedence-list
) cpl
)
838 (setf (slot-value class
'cpl-available-p
) t
)))
839 (update-class-can-precede-p cpl
))
841 (defun update-class-can-precede-p (cpl)
843 (let ((first (car cpl
)))
844 (dolist (c (cdr cpl
))
845 (pushnew c
(slot-value first
'can-precede-list
))))
846 (update-class-can-precede-p (cdr cpl
))))
848 (defun class-can-precede-p (class1 class2
)
849 (member class2
(class-can-precede-list class1
)))
851 (defun update-slots (class eslotds
)
852 (let ((instance-slots ())
854 (dolist (eslotd eslotds
)
855 (let ((alloc (slot-definition-allocation eslotd
)))
857 (:instance
(push eslotd instance-slots
))
858 (:class
(push eslotd class-slots
)))))
860 ;; If there is a change in the shape of the instances then the
861 ;; old class is now obsolete.
862 (let* ((nlayout (mapcar #'slot-definition-name
863 (sort instance-slots
#'<
864 :key
#'slot-definition-location
)))
865 (nslots (length nlayout
))
866 (nwrapper-class-slots (compute-class-slots class-slots
))
867 (owrapper (when (class-finalized-p class
)
868 (class-wrapper class
)))
869 (olayout (when owrapper
870 (wrapper-instance-slots-layout owrapper
)))
871 (owrapper-class-slots (and owrapper
(wrapper-class-slots owrapper
)))
873 (cond ((null owrapper
)
874 (make-wrapper nslots class
))
875 ((and (equal nlayout olayout
)
877 (loop for o in owrapper-class-slots
878 for n in nwrapper-class-slots
879 do
(unless (eq (car o
) (car n
)) (return t
)))))
882 ;; This will initialize the new wrapper to have the
883 ;; same state as the old wrapper. We will then have
884 ;; to change that. This may seem like wasted work
885 ;; (and it is), but the spec requires that we call
886 ;; MAKE-INSTANCES-OBSOLETE.
887 (make-instances-obsolete class
)
888 (class-wrapper class
)))))
890 (with-slots (wrapper slots
) class
891 (update-lisp-class-layout class nwrapper
)
893 (wrapper-instance-slots-layout nwrapper
) nlayout
894 (wrapper-class-slots nwrapper
) nwrapper-class-slots
895 (wrapper-no-of-instance-slots nwrapper
) nslots
897 (setf (slot-value class
'finalized-p
) t
)
898 (unless (eq owrapper nwrapper
)
899 (update-pv-table-cache-info class
)
900 (maybe-update-standard-class-locations class
)))))
902 (defun compute-class-slots (eslotds)
904 (dolist (eslotd eslotds
)
905 (push (assoc (slot-definition-name eslotd
)
906 (class-slot-cells (slot-definition-class eslotd
)))
910 (defun update-gfs-of-class (class)
911 (when (and (class-finalized-p class
)
912 (let ((cpl (class-precedence-list class
)))
913 (or (member *the-class-slot-class
* cpl
)
914 (member *the-class-standard-effective-slot-definition
*
916 (let ((gf-table (make-hash-table :test
'eq
)))
917 (labels ((collect-gfs (class)
918 (dolist (gf (specializer-direct-generic-functions class
))
919 (setf (gethash gf gf-table
) t
))
920 (mapc #'collect-gfs
(class-direct-superclasses class
))))
922 (maphash (lambda (gf ignore
)
923 (declare (ignore ignore
))
924 (update-gf-dfun class gf
))
927 (defun update-initargs (class inits
)
928 (setf (plist-value class
'default-initargs
) inits
))
930 (defmethod compute-default-initargs ((class slot-class
))
931 (let ((initargs (loop for c in
(class-precedence-list class
)
932 append
(class-direct-default-initargs c
))))
933 (delete-duplicates initargs
:test
#'eq
:key
#'car
:from-end t
)))
935 ;;;; protocols for constructing direct and effective slot definitions
937 (defmethod direct-slot-definition-class ((class std-class
) &rest initargs
)
938 (declare (ignore initargs
))
939 (find-class 'standard-direct-slot-definition
))
941 (defun make-direct-slotd (class initargs
)
942 (apply #'make-instance
943 (apply #'direct-slot-definition-class class initargs
)
947 ;;; I (CSR) am not sure, but I believe that the particular order of
948 ;;; slots is quite important: it is ideal to attempt to have a
949 ;;; constant slot location for the same notional slots as much as
950 ;;; possible, so that clever discriminating functions (ONE-INDEX et
951 ;;; al.) have a chance of working. The below at least walks through
952 ;;; the slots predictably, but maybe it would be good to compute some
953 ;;; kind of optimal slot layout by looking at locations of slots in
955 (defmethod compute-slots ((class std-class
))
956 ;; As specified, we must call COMPUTE-EFFECTIVE-SLOT-DEFINITION once
957 ;; for each different slot name we find in our superclasses. Each
958 ;; call receives the class and a list of the dslotds with that name.
959 ;; The list is in most-specific-first order.
960 (let ((name-dslotds-alist ()))
961 (dolist (c (reverse (class-precedence-list class
)))
962 (dolist (slot (class-direct-slots c
))
963 (let* ((name (slot-definition-name slot
))
964 (entry (assq name name-dslotds-alist
)))
966 (push slot
(cdr entry
))
967 (push (list name slot
) name-dslotds-alist
)))))
968 (mapcar (lambda (direct)
969 (compute-effective-slot-definition class
972 (nreverse name-dslotds-alist
))))
974 (defmethod compute-slots ((class standard-class
))
977 (defmethod compute-slots :around
((class standard-class
))
978 (let ((eslotds (call-next-method))
980 (dolist (eslotd eslotds eslotds
)
981 (setf (slot-definition-location eslotd
)
982 (case (slot-definition-allocation eslotd
)
986 (let* ((name (slot-definition-name eslotd
))
989 (slot-definition-allocation-class eslotd
)
990 ;; we get here if the user adds an extra slot
992 (setf (slot-definition-allocation-class eslotd
)
994 ;; which raises the question of what we should
995 ;; do if we find that said user has added a slot
996 ;; with the same name as another slot...
997 (cell (or (assq name
(class-slot-cells from-class
))
998 (setf (class-slot-cells from-class
)
999 (cons (cons name
+slot-unbound
+)
1000 (class-slot-cells from-class
))))))
1002 (if (eq +slot-unbound
+ (cdr cell
))
1003 ;; We may have inherited an initfunction
1004 (let ((initfun (slot-definition-initfunction eslotd
)))
1006 (rplacd cell
(funcall initfun
))
1009 (unless (slot-definition-class eslotd
)
1010 (setf (slot-definition-class eslotd
) class
))
1011 (initialize-internal-slot-functions eslotd
))))
1013 (defmethod compute-slots ((class funcallable-standard-class
))
1016 (defmethod compute-slots :around
((class funcallable-standard-class
))
1017 (labels ((instance-slot-names (slotds)
1019 (dolist (slotd slotds
(nreverse collect
))
1020 (when (eq (slot-definition-allocation slotd
) :instance
)
1021 (push (slot-definition-name slotd
) collect
)))))
1022 ;; This sorts slots so that slots of classes later in the CPL
1023 ;; come before slots of other classes. This is crucial for
1024 ;; funcallable instances because it ensures that the slots of
1025 ;; FUNCALLABLE-STANDARD-OBJECT, which includes the slots of
1026 ;; KERNEL:FUNCALLABLE-INSTANCE, come first, which in turn
1027 ;; makes it possible to treat FUNCALLABLE-STANDARD-OBJECT as
1028 ;; a funcallable instance.
1029 (compute-layout (eslotds)
1031 (names (instance-slot-names eslotds
)))
1033 (reverse (class-precedence-list class
))
1034 (nreverse (nconc names first
)))
1035 (dolist (ss (class-slots class
))
1036 (let ((name (slot-definition-name ss
)))
1037 (when (member name names
)
1039 (setq names
(delete name names
)))))))))
1040 (let ((all-slotds (call-next-method))
1043 (dolist (slotd all-slotds
)
1044 (case (slot-definition-allocation slotd
)
1045 (:instance
(push slotd instance-slots
))
1046 (:class
(push slotd class-slots
))))
1047 (let ((layout (compute-layout instance-slots
)))
1048 (dolist (slotd instance-slots
)
1049 (setf (slot-definition-location slotd
)
1050 (position (slot-definition-name slotd
) layout
))
1051 (initialize-internal-slot-functions slotd
)))
1052 (dolist (slotd class-slots
)
1053 (let ((name (slot-definition-name slotd
))
1054 (from-class (slot-definition-allocation-class slotd
)))
1055 (setf (slot-definition-location slotd
)
1056 (assoc name
(class-slot-cells from-class
)))
1057 (aver (consp (slot-definition-location slotd
)))
1058 (initialize-internal-slot-functions slotd
)))
1061 (defmethod compute-slots ((class structure-class
))
1062 (mapcan (lambda (superclass)
1063 (mapcar (lambda (dslotd)
1064 (compute-effective-slot-definition
1066 (slot-definition-name dslotd
)
1068 (class-direct-slots superclass
)))
1069 (reverse (slot-value class
'class-precedence-list
))))
1071 (defmethod compute-slots :around
((class structure-class
))
1072 (let ((eslotds (call-next-method)))
1073 (mapc #'initialize-internal-slot-functions eslotds
)
1076 (defmethod compute-effective-slot-definition ((class slot-class
) name dslotds
)
1077 (declare (ignore name
))
1078 (let* ((initargs (compute-effective-slot-definition-initargs class dslotds
))
1079 (class (apply #'effective-slot-definition-class class initargs
)))
1080 (apply #'make-instance class initargs
)))
1082 (defmethod effective-slot-definition-class ((class std-class
) &rest initargs
)
1083 (declare (ignore initargs
))
1084 (find-class 'standard-effective-slot-definition
))
1086 (defmethod effective-slot-definition-class ((class structure-class
) &rest initargs
)
1087 (declare (ignore initargs
))
1088 (find-class 'structure-effective-slot-definition
))
1090 (defmethod compute-effective-slot-definition-initargs
1091 ((class slot-class
) direct-slotds
)
1097 (allocation-class nil
)
1103 (dolist (slotd direct-slotds
)
1106 (setq name
(slot-definition-name slotd
)
1109 (when (slot-definition-initfunction slotd
)
1110 (setq initform
(slot-definition-initform slotd
)
1111 initfunction
(slot-definition-initfunction slotd
)
1114 (setq allocation
(slot-definition-allocation slotd
)
1115 allocation-class
(slot-definition-class slotd
)
1117 (setq initargs
(append (slot-definition-initargs slotd
) initargs
))
1118 (let ((slotd-type (slot-definition-type slotd
)))
1119 (setq type
(cond ((eq type t
) slotd-type
)
1120 ((*subtypep type slotd-type
) type
)
1121 (t `(and ,type
,slotd-type
)))))))
1124 :initfunction initfunction
1126 :allocation allocation
1127 :allocation-class allocation-class
1131 (defmethod compute-effective-slot-definition-initargs :around
1132 ((class structure-class
) direct-slotds
)
1133 (let ((slotd (car direct-slotds
)))
1134 (list* :defstruct-accessor-symbol
1135 (slot-definition-defstruct-accessor-symbol slotd
)
1136 :internal-reader-function
1137 (slot-definition-internal-reader-function slotd
)
1138 :internal-writer-function
1139 (slot-definition-internal-writer-function slotd
)
1140 (call-next-method))))
1142 ;;; NOTE: For bootstrapping considerations, these can't use MAKE-INSTANCE
1143 ;;; to make the method object. They have to use make-a-method which
1144 ;;; is a specially bootstrapped mechanism for making standard methods.
1145 (defmethod reader-method-class ((class slot-class
) direct-slot
&rest initargs
)
1146 (declare (ignore direct-slot initargs
))
1147 (find-class 'standard-reader-method
))
1149 (defmethod add-reader-method ((class slot-class
) generic-function slot-name
)
1150 (add-method generic-function
1151 (make-a-method 'standard-reader-method
1153 (list (or (class-name class
) 'object
))
1155 (make-reader-method-function class slot-name
)
1156 "automatically generated reader method"
1159 (defmethod writer-method-class ((class slot-class
) direct-slot
&rest initargs
)
1160 (declare (ignore direct-slot initargs
))
1161 (find-class 'standard-writer-method
))
1163 (defmethod add-writer-method ((class slot-class
) generic-function slot-name
)
1164 (add-method generic-function
1165 (make-a-method 'standard-writer-method
1167 (list 'new-value
(or (class-name class
) 'object
))
1168 (list *the-class-t
* class
)
1169 (make-writer-method-function class slot-name
)
1170 "automatically generated writer method"
1173 (defmethod add-boundp-method ((class slot-class
) generic-function slot-name
)
1174 (add-method generic-function
1175 (make-a-method 'standard-boundp-method
1177 (list (or (class-name class
) 'object
))
1179 (make-boundp-method-function class slot-name
)
1180 "automatically generated boundp method"
1183 (defmethod remove-reader-method ((class slot-class
) generic-function
)
1184 (let ((method (get-method generic-function
() (list class
) nil
)))
1185 (when method
(remove-method generic-function method
))))
1187 (defmethod remove-writer-method ((class slot-class
) generic-function
)
1189 (get-method generic-function
() (list *the-class-t
* class
) nil
)))
1190 (when method
(remove-method generic-function method
))))
1192 (defmethod remove-boundp-method ((class slot-class
) generic-function
)
1193 (let ((method (get-method generic-function
() (list class
) nil
)))
1194 (when method
(remove-method generic-function method
))))
1196 ;;; MAKE-READER-METHOD-FUNCTION and MAKE-WRITE-METHOD function are NOT
1197 ;;; part of the standard protocol. They are however useful, PCL makes
1198 ;;; use of them internally and documents them for PCL users.
1200 ;;; *** This needs work to make type testing by the writer functions which
1201 ;;; *** do type testing faster. The idea would be to have one constructor
1202 ;;; *** for each possible type test.
1204 ;;; *** There is a subtle bug here which is going to have to be fixed.
1205 ;;; *** Namely, the simplistic use of the template has to be fixed. We
1206 ;;; *** have to give the OPTIMIZE-SLOT-VALUE method the user might have
1207 ;;; *** defined for this metaclass a chance to run.
1209 (defmethod make-reader-method-function ((class slot-class
) slot-name
)
1210 (make-std-reader-method-function (class-name class
) slot-name
))
1212 (defmethod make-writer-method-function ((class slot-class
) slot-name
)
1213 (make-std-writer-method-function (class-name class
) slot-name
))
1215 (defmethod make-boundp-method-function ((class slot-class
) slot-name
)
1216 (make-std-boundp-method-function (class-name class
) slot-name
))
1218 (defmethod compatible-meta-class-change-p (class proto-new-class
)
1219 (eq (class-of class
) (class-of proto-new-class
)))
1221 (defmethod validate-superclass ((class class
) (new-super class
))
1222 (or (eq new-super
*the-class-t
*)
1223 (eq (class-of class
) (class-of new-super
))))
1225 (defmethod validate-superclass ((class standard-class
) (new-super std-class
))
1226 (let ((new-super-meta-class (class-of new-super
)))
1227 (or (eq new-super-meta-class
*the-class-std-class
*)
1228 (eq (class-of class
) new-super-meta-class
))))
1230 ;;; What this does depends on which of the four possible values of
1231 ;;; LAYOUT-INVALID the PCL wrapper has; the simplest case is when it
1232 ;;; is (:FLUSH <wrapper>) or (:OBSOLETE <wrapper>), when there is
1233 ;;; nothing to do, as the new wrapper has already been created. If
1234 ;;; LAYOUT-INVALID returns NIL, then we invalidate it (setting it to
1235 ;;; (:FLUSH <wrapper>); UPDATE-SLOTS later gets to choose whether or
1236 ;;; not to "upgrade" this to (:OBSOLETE <wrapper>).
1238 ;;; This leaves the case where LAYOUT-INVALID returns T, which happens
1239 ;;; when REGISTER-LAYOUT has invalidated a superclass of CLASS (which
1240 ;;; invalidated all the subclasses in SB-KERNEL land). Again, here we
1241 ;;; must flush the caches and allow UPDATE-SLOTS to decide whether to
1242 ;;; obsolete the wrapper.
1244 ;;; FIXME: either here or in INVALID-WRAPPER-P looks like a good place
1245 ;;; for (AVER (NOT (EQ (LAYOUT-INVALID OWRAPPER)
1246 ;;; :UNINITIALIZED)))
1248 ;;; Thanks to Gerd Moellmann for the explanation. -- CSR, 2002-10-29
1249 (defun force-cache-flushes (class)
1250 (let* ((owrapper (class-wrapper class
)))
1251 ;; We only need to do something if the wrapper is still valid. If
1252 ;; the wrapper isn't valid, state will be FLUSH or OBSOLETE, and
1253 ;; both of those will already be doing what we want. In
1254 ;; particular, we must be sure we never change an OBSOLETE into a
1255 ;; FLUSH since OBSOLETE means do what FLUSH does and then some.
1256 (when (or (not (invalid-wrapper-p owrapper
))
1257 ;; KLUDGE: despite the observations above, this remains
1258 ;; a violation of locality or what might be considered
1259 ;; good style. There has to be a better way! -- CSR,
1261 (eq (layout-invalid owrapper
) t
))
1262 (let ((nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper
)
1264 (setf (wrapper-instance-slots-layout nwrapper
)
1265 (wrapper-instance-slots-layout owrapper
))
1266 (setf (wrapper-class-slots nwrapper
)
1267 (wrapper-class-slots owrapper
))
1269 (update-lisp-class-layout class nwrapper
)
1270 (setf (slot-value class
'wrapper
) nwrapper
)
1271 ;; Use :OBSOLETE instead of :FLUSH if any superclass has
1273 (if (find-if (lambda (x)
1274 (and (consp x
) (eq :obsolete
(car x
))))
1275 (layout-inherits owrapper
)
1276 :key
#'layout-invalid
)
1277 (invalidate-wrapper owrapper
:obsolete nwrapper
)
1278 (invalidate-wrapper owrapper
:flush nwrapper
)))))))
1280 (defun flush-cache-trap (owrapper nwrapper instance
)
1281 (declare (ignore owrapper
))
1282 (set-wrapper instance nwrapper
))
1284 ;;; MAKE-INSTANCES-OBSOLETE can be called by user code. It will cause
1285 ;;; the next access to the instance (as defined in 88-002R) to trap
1286 ;;; through the UPDATE-INSTANCE-FOR-REDEFINED-CLASS mechanism.
1287 (defmethod make-instances-obsolete ((class std-class
))
1288 (let* ((owrapper (class-wrapper class
))
1289 (nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper
)
1291 (setf (wrapper-instance-slots-layout nwrapper
)
1292 (wrapper-instance-slots-layout owrapper
))
1293 (setf (wrapper-class-slots nwrapper
)
1294 (wrapper-class-slots owrapper
))
1296 (update-lisp-class-layout class nwrapper
)
1297 (setf (slot-value class
'wrapper
) nwrapper
)
1298 (invalidate-wrapper owrapper
:obsolete nwrapper
)
1301 (defmethod make-instances-obsolete ((class symbol
))
1302 (make-instances-obsolete (find-class class
))
1303 ;; ANSI wants the class name when called with a symbol.
1306 ;;; OBSOLETE-INSTANCE-TRAP is the internal trap that is called when we
1307 ;;; see an obsolete instance. The times when it is called are:
1308 ;;; - when the instance is involved in method lookup
1309 ;;; - when attempting to access a slot of an instance
1311 ;;; It is not called by class-of, wrapper-of, or any of the low-level
1312 ;;; instance access macros.
1314 ;;; Of course these times when it is called are an internal
1315 ;;; implementation detail of PCL and are not part of the documented
1316 ;;; description of when the obsolete instance update happens. The
1317 ;;; documented description is as it appears in 88-002R.
1319 ;;; This has to return the new wrapper, so it counts on all the
1320 ;;; methods on obsolete-instance-trap-internal to return the new
1321 ;;; wrapper. It also does a little internal error checking to make
1322 ;;; sure that the traps are only happening when they should, and that
1323 ;;; the trap methods are computing appropriate new wrappers.
1325 ;;; OBSOLETE-INSTANCE-TRAP might be called on structure instances
1326 ;;; after a structure is redefined. In most cases,
1327 ;;; OBSOLETE-INSTANCE-TRAP will not be able to fix the old instance,
1328 ;;; so it must signal an error. The hard part of this is that the
1329 ;;; error system and debugger might cause OBSOLETE-INSTANCE-TRAP to be
1330 ;;; called again, so in that case, we have to return some reasonable
1331 ;;; wrapper, instead.
1333 (defvar *in-obsolete-instance-trap
* nil
)
1334 (defvar *the-wrapper-of-structure-object
*
1335 (class-wrapper (find-class 'structure-object
)))
1337 (define-condition obsolete-structure
(error)
1338 ((datum :reader obsolete-structure-datum
:initarg
:datum
))
1340 (lambda (condition stream
)
1341 ;; Don't try to print the structure, since it probably won't work.
1343 "~@<obsolete structure error for a structure of type ~2I~_~S~:>"
1344 (type-of (obsolete-structure-datum condition
))))))
1346 (defun obsolete-instance-trap (owrapper nwrapper instance
)
1347 (if (not (pcl-instance-p instance
))
1348 (if *in-obsolete-instance-trap
*
1349 *the-wrapper-of-structure-object
*
1350 (let ((*in-obsolete-instance-trap
* t
))
1351 (error 'obsolete-structure
:datum instance
)))
1352 (let* ((class (wrapper-class* nwrapper
))
1353 (copy (allocate-instance class
)) ;??? allocate-instance ???
1354 (olayout (wrapper-instance-slots-layout owrapper
))
1355 (nlayout (wrapper-instance-slots-layout nwrapper
))
1356 (oslots (get-slots instance
))
1357 (nslots (get-slots copy
))
1358 (oclass-slots (wrapper-class-slots owrapper
))
1363 ;; local --> local transfer value
1364 ;; local --> shared discard value, discard slot
1365 ;; local --> -- discard slot
1366 ;; shared --> local transfer value
1367 ;; shared --> shared -- (cf SHARED-INITIALIZE :AFTER STD-CLASS)
1368 ;; shared --> -- discard value
1369 ;; -- --> local add slot
1372 ;; Collect class slots from inherited wrappers. Needed for
1373 ;; shared -> local transfers of inherited slots.
1374 (let ((inherited (layout-inherits owrapper
)))
1375 (loop for i from
(1- (length inherited
)) downto
0
1376 for layout
= (aref inherited i
)
1377 when
(typep layout
'wrapper
)
1378 do
(dolist (slot (wrapper-class-slots layout
))
1379 (pushnew slot oclass-slots
:key
#'car
))))
1381 ;; Go through all the old local slots.
1383 (dolist (name olayout
)
1384 (let ((npos (posq name nlayout
)))
1386 (setf (clos-slots-ref nslots npos
)
1387 (clos-slots-ref oslots opos
))
1389 (push name discarded
)
1390 (unless (eq (clos-slots-ref oslots opos
) +slot-unbound
+)
1391 (setf (getf plist name
) (clos-slots-ref oslots opos
))))))
1394 ;; Go through all the old shared slots.
1395 (dolist (oclass-slot-and-val oclass-slots
)
1396 (let ((name (car oclass-slot-and-val
))
1397 (val (cdr oclass-slot-and-val
)))
1398 (let ((npos (posq name nlayout
)))
1400 (setf (clos-slots-ref nslots npos
) val
)))))
1402 ;; Go through all the new local slots to compute the added slots.
1403 (dolist (nlocal nlayout
)
1404 (unless (or (memq nlocal olayout
)
1405 (assq nlocal oclass-slots
))
1406 (push nlocal added
)))
1408 (swap-wrappers-and-slots instance copy
)
1410 (update-instance-for-redefined-class instance
1416 (defun change-class-internal (instance new-class initargs
)
1417 (let* ((old-class (class-of instance
))
1418 (copy (allocate-instance new-class
))
1419 (new-wrapper (get-wrapper copy
))
1420 (old-wrapper (class-wrapper old-class
))
1421 (old-layout (wrapper-instance-slots-layout old-wrapper
))
1422 (new-layout (wrapper-instance-slots-layout new-wrapper
))
1423 (old-slots (get-slots instance
))
1424 (new-slots (get-slots copy
))
1425 (old-class-slots (wrapper-class-slots old-wrapper
)))
1427 ;; "The values of local slots specified by both the class CTO and
1428 ;; CFROM are retained. If such a local slot was unbound, it
1429 ;; remains unbound."
1430 (let ((new-position 0))
1431 (dolist (new-slot new-layout
)
1432 (let ((old-position (posq new-slot old-layout
)))
1434 (setf (clos-slots-ref new-slots new-position
)
1435 (clos-slots-ref old-slots old-position
))))
1436 (incf new-position
)))
1438 ;; "The values of slots specified as shared in the class CFROM and
1439 ;; as local in the class CTO are retained."
1440 (dolist (slot-and-val old-class-slots
)
1441 (let ((position (posq (car slot-and-val
) new-layout
)))
1443 (setf (clos-slots-ref new-slots position
) (cdr slot-and-val
)))))
1445 ;; Make the copy point to the old instance's storage, and make the
1446 ;; old instance point to the new storage.
1447 (swap-wrappers-and-slots instance copy
)
1449 (apply #'update-instance-for-different-class copy instance initargs
)
1452 (defmethod change-class ((instance standard-object
)
1453 (new-class standard-class
)
1455 (change-class-internal instance new-class initargs
))
1457 (defmethod change-class ((instance funcallable-standard-object
)
1458 (new-class funcallable-standard-class
)
1460 (change-class-internal instance new-class initargs
))
1462 (defmethod change-class ((instance standard-object
)
1463 (new-class funcallable-standard-class
)
1465 (declare (ignore initargs
))
1466 (error "You can't change the class of ~S to ~S~@
1467 because it isn't already an instance with metaclass ~S."
1468 instance new-class
'standard-class
))
1470 (defmethod change-class ((instance funcallable-standard-object
)
1471 (new-class standard-class
)
1473 (declare (ignore initargs
))
1474 (error "You can't change the class of ~S to ~S~@
1475 because it isn't already an instance with metaclass ~S."
1476 instance new-class
'funcallable-standard-class
))
1478 (defmethod change-class ((instance t
) (new-class-name symbol
) &rest initargs
)
1479 (apply #'change-class instance
(find-class new-class-name
) initargs
))
1481 ;;;; The metaclass BUILT-IN-CLASS
1483 ;;;; This metaclass is something of a weird creature. By this point, all
1484 ;;;; instances of it which will exist have been created, and no instance
1485 ;;;; is ever created by calling MAKE-INSTANCE.
1487 ;;;; But, there are other parts of the protocol we must follow and those
1488 ;;;; definitions appear here.
1490 (defmethod shared-initialize :before
1491 ((class built-in-class
) slot-names
&rest initargs
)
1492 (declare (ignore slot-names initargs
))
1493 (error "attempt to initialize or reinitialize a built in class"))
1495 (defmethod class-direct-slots ((class built-in-class
)) ())
1496 (defmethod class-slots ((class built-in-class
)) ())
1497 (defmethod class-direct-default-initargs ((class built-in-class
)) ())
1498 (defmethod class-default-initargs ((class built-in-class
)) ())
1500 (defmethod validate-superclass ((c class
) (s built-in-class
))
1501 (or (eq s
*the-class-t
*) (eq s
*the-class-stream
*)
1502 ;; FIXME: bad things happen if someone tries to mix in both
1503 ;; FILE-STREAM and STRING-STREAM (as they have the same
1504 ;; layout-depthoid). Is there any way we can provide a useful
1505 ;; error message? -- CSR, 2005-05-03
1506 (eq s
*the-class-file-stream
*) (eq s
*the-class-string-stream
*)))
1508 ;;; Some necessary methods for FORWARD-REFERENCED-CLASS
1509 (defmethod class-direct-slots ((class forward-referenced-class
)) ())
1510 (defmethod class-direct-default-initargs ((class forward-referenced-class
)) ())
1511 (macrolet ((def (method)
1512 `(defmethod ,method
((class forward-referenced-class
))
1513 (error "~@<~I~S was called on a forward referenced class:~2I~_~S~:>"
1515 (def class-default-initargs
)
1516 (def class-precedence-list
)
1519 (defmethod validate-superclass ((c slot-class
)
1520 (f forward-referenced-class
))
1523 (defmethod add-dependent ((metaobject dependent-update-mixin
) dependent
)
1524 (pushnew dependent
(plist-value metaobject
'dependents
)))
1526 (defmethod remove-dependent ((metaobject dependent-update-mixin
) dependent
)
1527 (setf (plist-value metaobject
'dependents
)
1528 (delete dependent
(plist-value metaobject
'dependents
))))
1530 (defmethod map-dependents ((metaobject dependent-update-mixin
) function
)
1531 (dolist (dependent (plist-value metaobject
'dependents
))
1532 (funcall function dependent
)))