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 (defmethod shared-initialize :after
((object documentation-mixin
)
123 &key
(documentation nil documentation-p
))
124 (declare (ignore slot-names
))
125 (when documentation-p
126 (setf (plist-value object
'documentation
) documentation
)))
128 ;;; default if DOC-TYPE doesn't match one of the specified types
129 (defmethod documentation (object doc-type
)
130 (warn "unsupported DOCUMENTATION: type ~S for object ~S"
135 ;;; default if DOC-TYPE doesn't match one of the specified types
136 (defmethod (setf documentation
) (new-value object doc-type
)
137 ;; CMU CL made this an error, but since ANSI says that even for supported
138 ;; doc types an implementation is permitted to discard docs at any time
139 ;; for any reason, this feels to me more like a warning. -- WHN 19991214
140 (warn "discarding unsupported DOCUMENTATION of type ~S for object ~S"
145 (defmethod documentation ((object documentation-mixin
) doc-type
)
146 (declare (ignore doc-type
))
147 (plist-value object
'documentation
))
149 (defmethod (setf documentation
) (new-value
150 (object documentation-mixin
)
152 (declare (ignore doc-type
))
153 (setf (plist-value object
'documentation
) new-value
))
155 (defmethod documentation ((slotd standard-slot-definition
) doc-type
)
156 (declare (ignore doc-type
))
157 (slot-value slotd
'documentation
))
159 (defmethod (setf documentation
) (new-value
160 (slotd standard-slot-definition
)
162 (declare (ignore doc-type
))
163 (setf (slot-value slotd
'documentation
) new-value
))
165 ;;;; various class accessors that are a little more complicated than can be
166 ;;;; done with automatically generated reader methods
168 (defmethod class-prototype ((class std-class
))
169 (with-slots (prototype) class
170 (or prototype
(setq prototype
(allocate-instance class
)))))
172 (defmethod class-prototype ((class structure-class
))
173 (with-slots (prototype wrapper defstruct-constructor
) class
176 (if defstruct-constructor
177 (allocate-instance class
)
178 (allocate-standard-instance wrapper
))))))
180 (defmethod class-direct-default-initargs ((class slot-class
))
181 (plist-value class
'direct-default-initargs
))
183 (defmethod class-default-initargs ((class slot-class
))
184 (plist-value class
'default-initargs
))
186 (defmethod class-slot-cells ((class std-class
))
187 (plist-value class
'class-slot-cells
))
189 ;;;; class accessors that are even a little bit more complicated than those
190 ;;;; above. These have a protocol for updating them, we must implement that
193 ;;; Maintaining the direct subclasses backpointers. The update methods are
194 ;;; here, the values are read by an automatically generated reader method.
195 (defmethod add-direct-subclass ((class class
) (subclass class
))
196 (with-slots (direct-subclasses) class
197 (pushnew subclass direct-subclasses
)
199 (defmethod remove-direct-subclass ((class class
) (subclass class
))
200 (with-slots (direct-subclasses) class
201 (setq direct-subclasses
(remove subclass direct-subclasses
))
204 ;;; Maintaining the direct-methods and direct-generic-functions backpointers.
206 ;;; There are four generic functions involved, each has one method for the
207 ;;; class case and another method for the damned EQL specializers. All of
208 ;;; these are specified methods and appear in their specified place in the
211 ;;; ADD-DIRECT-METHOD
212 ;;; REMOVE-DIRECT-METHOD
213 ;;; SPECIALIZER-DIRECT-METHODS
214 ;;; SPECIALIZER-DIRECT-GENERIC-FUNCTIONS
216 ;;; In each case, we maintain one value which is a cons. The car is the list
217 ;;; methods. The cdr is a list of the generic functions. The cdr is always
219 (defmethod add-direct-method ((specializer class
) (method method
))
220 (with-slots (direct-methods) specializer
221 (setf (car direct-methods
) (adjoin method
(car direct-methods
)) ;PUSH
222 (cdr direct-methods
) ()))
224 (defmethod remove-direct-method ((specializer class
) (method method
))
225 (with-slots (direct-methods) specializer
226 (setf (car direct-methods
) (remove method
(car direct-methods
))
227 (cdr direct-methods
) ()))
230 (defmethod specializer-direct-methods ((specializer class
))
231 (with-slots (direct-methods) specializer
232 (car direct-methods
)))
234 (defmethod specializer-direct-generic-functions ((specializer class
))
235 (with-slots (direct-methods) specializer
236 (or (cdr direct-methods
)
237 (setf (cdr direct-methods
)
239 (dolist (m (car direct-methods
))
240 ;; the old PCL code used COLLECTING-ONCE which used
241 ;; #'EQ to check for newness
242 (pushnew (method-generic-function m
) collect
:test
#'eq
))
243 (nreverse collect
))))))
245 ;;; This hash table is used to store the direct methods and direct generic
246 ;;; functions of EQL specializers. Each value in the table is the cons.
247 (defvar *eql-specializer-methods
* (make-hash-table :test
'eql
))
248 (defvar *class-eq-specializer-methods
* (make-hash-table :test
'eq
))
250 (defmethod specializer-method-table ((specializer eql-specializer
))
251 *eql-specializer-methods
*)
253 (defmethod specializer-method-table ((specializer class-eq-specializer
))
254 *class-eq-specializer-methods
*)
256 (defmethod add-direct-method ((specializer specializer-with-object
)
258 (let* ((object (specializer-object specializer
))
259 (table (specializer-method-table specializer
))
260 (entry (gethash object table
)))
263 (setf (gethash object table
)
265 (setf (car entry
) (adjoin method
(car entry
))
269 (defmethod remove-direct-method ((specializer specializer-with-object
)
271 (let* ((object (specializer-object specializer
))
272 (entry (gethash object
(specializer-method-table specializer
))))
274 (setf (car entry
) (remove method
(car entry
))
278 (defmethod specializer-direct-methods ((specializer specializer-with-object
))
279 (car (gethash (specializer-object specializer
)
280 (specializer-method-table specializer
))))
282 (defmethod specializer-direct-generic-functions ((specializer
283 specializer-with-object
))
284 (let* ((object (specializer-object specializer
))
285 (entry (gethash object
(specializer-method-table specializer
))))
290 (dolist (m (car entry
))
291 (pushnew (method-generic-function m
) collect
:test
#'eq
))
292 (nreverse collect
)))))))
294 (defun map-specializers (function)
295 (map-all-classes (lambda (class)
296 (funcall function
(class-eq-specializer class
))
297 (funcall function class
)))
298 (maphash (lambda (object methods
)
299 (declare (ignore methods
))
300 (intern-eql-specializer object
))
301 *eql-specializer-methods
*)
302 (maphash (lambda (object specl
)
303 (declare (ignore object
))
304 (funcall function specl
))
305 *eql-specializer-table
*)
308 (defun map-all-generic-functions (function)
309 (let ((all-generic-functions (make-hash-table :test
'eq
)))
310 (map-specializers (lambda (specl)
311 (dolist (gf (specializer-direct-generic-functions
313 (unless (gethash gf all-generic-functions
)
314 (setf (gethash gf all-generic-functions
) t
)
315 (funcall function gf
))))))
318 (defmethod shared-initialize :after
((specl class-eq-specializer
)
321 (declare (ignore slot-names
))
322 (setf (slot-value specl
'type
) `(class-eq ,(specializer-class specl
))))
324 (defmethod shared-initialize :after
((specl eql-specializer
) slot-names
&key
)
325 (declare (ignore slot-names
))
326 (setf (slot-value specl
'type
) `(eql ,(specializer-object specl
))))
328 (defun real-load-defclass (name metaclass-name supers slots other
)
329 (let ((res (apply #'ensure-class name
:metaclass metaclass-name
330 :direct-superclasses supers
332 :definition-source
`((defclass ,name
)
337 (setf (gdefinition 'load-defclass
) #'real-load-defclass
)
339 (defun ensure-class (name &rest all
)
340 (apply #'ensure-class-using-class
(find-class name nil
) name all
))
342 (defmethod ensure-class-using-class ((class null
) name
&rest args
&key
)
343 (multiple-value-bind (meta initargs
)
344 (ensure-class-values class args
)
345 (set-class-type-translation (class-prototype meta
) name
)
346 (setf class
(apply #'make-instance meta
:name name initargs
)
347 (find-class name
) class
)
348 (set-class-type-translation class name
)
351 (defmethod ensure-class-using-class ((class pcl-class
) name
&rest args
&key
)
352 (multiple-value-bind (meta initargs
)
353 (ensure-class-values class args
)
354 (unless (eq (class-of class
) meta
)
355 (apply #'change-class class meta initargs
))
356 (apply #'reinitialize-instance class initargs
)
357 (setf (find-class name
) class
)
358 (set-class-type-translation class name
)
361 (defmethod class-predicate-name ((class t
))
366 ((not (legal-class-name-p s
))
367 (error "~S is not a class or a legal class name." s
))
369 (or (find-class s nil
)
370 (make-instance 'forward-referenced-class
373 (defun ensure-class-values (class args
)
374 (let* ((initargs (copy-list args
))
375 (unsupplied (list 1))
376 (supplied-meta (getf initargs
:metaclass unsupplied
))
377 (supplied-supers (getf initargs
:direct-superclasses unsupplied
))
378 (supplied-slots (getf initargs
:direct-slots unsupplied
))
380 (cond ((neq supplied-meta unsupplied
)
381 (find-class supplied-meta
))
383 (forward-referenced-class-p class
))
384 *the-class-standard-class
*)
387 ;; KLUDGE: It seemed to me initially that there ought to be a way
388 ;; of collecting all the erroneous problems in one go, rather than
389 ;; this way of solving the problem of signalling the errors that
390 ;; we are required to, which stops at the first bogus input.
391 ;; However, after playing around a little, I couldn't find that
392 ;; way, so I've left it as is, but if someone does come up with a
393 ;; better way... -- CSR, 2002-09-08
394 (do ((direct-slots (getf initargs
:direct-slots
) (cdr direct-slots
)))
395 ((endp direct-slots
) nil
)
396 (destructuring-bind (slot &rest more
) direct-slots
397 (let ((slot-name (getf slot
:name
)))
398 (when (some (lambda (s) (eq slot-name
(getf s
:name
))) more
)
399 ;; FIXME: It's quite possible that we ought to define an
400 ;; SB-INT:PROGRAM-ERROR function to signal these and other
401 ;; errors throughout the codebase that are required to be
402 ;; of type PROGRAM-ERROR.
403 (error 'simple-program-error
404 :format-control
"~@<There is more than one direct slot ~
406 :format-arguments
(list slot-name
)))
407 (do ((stuff slot
(cddr stuff
)))
409 (destructuring-bind (option value
&rest more
) stuff
411 ((and (member option
'(:allocation
:type
412 :initform
:documentation
))
414 (getf more option unsupplied
))))
415 (error 'simple-program-error
416 :format-control
"~@<Duplicate slot option ~S for ~
418 :format-arguments
(list option slot-name
)))
419 ((and (eq option
:readers
)
420 (notevery #'symbolp value
))
421 (error 'simple-program-error
422 :format-control
"~@<Slot reader names for slot ~
423 named ~S must be symbols.~:>"
424 :format-arguments
(list slot-name
)))
425 ((and (eq option
:initargs
)
426 (notevery #'symbolp value
))
427 (error 'simple-program-error
428 :format-control
"~@<Slot initarg names for slot ~
429 named ~S must be symbols.~:>"
430 :format-arguments
(list slot-name
)))))))))
431 (loop for
(initarg . more
) on
(getf initargs
:direct-default-initargs
)
432 for name
= (car initarg
)
433 when
(some (lambda (a) (eq (car a
) name
)) more
)
434 do
(error 'simple-program-error
435 :format-control
"~@<Duplicate initialization argument ~
436 name ~S in :DEFAULT-INITARGS.~:>"
437 :format-arguments
(list name class
)))
439 (default-initargs 0))
440 (do ((args initargs
(cddr args
)))
444 (when (> (incf metaclass
) 1)
445 (error 'simple-program-error
446 :format-control
"~@<More than one :METACLASS ~
447 option specified.~:>")))
448 (:direct-default-initargs
449 (when (> (incf default-initargs
) 1)
450 (error 'simple-program-error
451 :format-control
"~@<More than one :DEFAULT-INITARGS ~
452 option specified.~:>"))))))
453 (remf initargs
:metaclass
)
454 (loop (unless (remf initargs
:direct-superclasses
) (return)))
455 (loop (unless (remf initargs
:direct-slots
) (return)))
459 (when (neq supplied-supers unsupplied
)
460 (list :direct-superclasses
(mapcar #'fix-super supplied-supers
)))
461 (when (neq supplied-slots unsupplied
)
462 (list :direct-slots supplied-slots
))
465 (defmethod shared-initialize :after
468 &key
(direct-superclasses nil direct-superclasses-p
)
469 (direct-slots nil direct-slots-p
)
470 (direct-default-initargs nil direct-default-initargs-p
)
471 (predicate-name nil predicate-name-p
))
472 (declare (ignore slot-names
))
473 (cond (direct-superclasses-p
474 (setq direct-superclasses
475 (or direct-superclasses
476 (list (if (funcallable-standard-class-p class
)
477 *the-class-funcallable-standard-object
*
478 *the-class-standard-object
*))))
479 (dolist (superclass direct-superclasses
)
480 (unless (validate-superclass class superclass
)
481 (error "The class ~S was specified as a~%
482 super-class of the class ~S;~%~
483 but the meta-classes ~S and~%~S are incompatible.~@
484 Define a method for ~S to avoid this error."
485 superclass class
(class-of superclass
) (class-of class
)
486 'validate-superclass
)))
487 (setf (slot-value class
'direct-superclasses
) direct-superclasses
))
489 (setq direct-superclasses
(slot-value class
'direct-superclasses
))))
492 (setf (slot-value class
'direct-slots
)
493 (mapcar (lambda (pl) (make-direct-slotd class pl
))
495 (slot-value class
'direct-slots
)))
496 (if direct-default-initargs-p
497 (setf (plist-value class
'direct-default-initargs
)
498 direct-default-initargs
)
499 (setq direct-default-initargs
500 (plist-value class
'direct-default-initargs
)))
501 (setf (plist-value class
'class-slot-cells
)
502 ;; The below initializes shared slots from direct initforms,
503 ;; but one might inherit initforms from superclasses
504 ;; (cf. UPDATE-SHARED-SLOT-VALUES).
506 (dolist (dslotd direct-slots
)
507 (when (eq :class
(slot-definition-allocation dslotd
))
508 (let ((initfunction (slot-definition-initfunction dslotd
)))
509 (push (cons (slot-definition-name dslotd
)
511 (funcall initfunction
)
515 (setq predicate-name
(if predicate-name-p
516 (setf (slot-value class
'predicate-name
)
517 (car predicate-name
))
518 (or (slot-value class
'predicate-name
)
519 (setf (slot-value class
'predicate-name
)
520 (make-class-predicate-name (class-name
522 (add-direct-subclasses class direct-superclasses
)
523 (make-class-predicate class predicate-name
)
524 (update-class class nil
)
525 (do* ((slots (slot-value class
'slots
) (cdr slots
))
527 ((null slots
) (when dupes
529 ;; FIXME: the indentation request ("~4I")
530 ;; below appears not to do anything. Finding
531 ;; out why would be nice. -- CSR, 2003-04-24
532 "~@<slot names with the same SYMBOL-NAME but ~
533 different SYMBOL-PACKAGE (possible package problem) ~
534 for class ~S:~@:_~4I~<~@{~S~^~:@_~}~:>~@:>"
537 (let* ((slot (car slots
))
538 (oslots (remove (slot-definition-name slot
) (cdr slots
)
539 :test-not
#'string
= :key
#'slot-definition-name
)))
541 (pushnew (cons (slot-definition-name slot
)
542 (mapcar #'slot-definition-name oslots
))
544 :test
#'string
= :key
#'car
))))
545 (add-slot-accessors class direct-slots
)
546 (make-preliminary-layout class
))
548 (defmethod shared-initialize :after
((class forward-referenced-class
)
549 slot-names
&key
&allow-other-keys
)
550 (declare (ignore slot-names
))
551 (make-preliminary-layout class
))
553 (defvar *allow-forward-referenced-classes-in-cpl-p
* nil
)
555 ;;; Give CLASS a preliminary layout if it doesn't have one already, to
556 ;;; make it known to the type system.
557 (defun make-preliminary-layout (class)
558 (flet ((compute-preliminary-cpl (root)
559 (let ((*allow-forward-referenced-classes-in-cpl-p
* t
))
560 (compute-class-precedence-list root
))))
561 (unless (class-finalized-p class
)
562 (let ((name (class-name class
)))
563 (setf (find-class name
) class
)
564 ;; KLUDGE: This is fairly horrible. We need to make a
565 ;; full-fledged CLASSOID here, not just tell the compiler that
566 ;; some class is forthcoming, because there are legitimate
567 ;; questions one can ask of the type system, implemented in
568 ;; terms of CLASSOIDs, involving forward-referenced classes. So.
569 (when (and (eq *boot-state
* 'complete
)
570 (null (find-classoid name nil
)))
571 (setf (find-classoid name
)
572 (make-standard-classoid :name name
)))
573 (set-class-type-translation class name
)
574 (let ((layout (make-wrapper 0 class
))
575 (classoid (find-classoid name
)))
576 (setf (layout-classoid layout
) classoid
)
577 (setf (classoid-pcl-class classoid
) class
)
578 (setf (slot-value class
'wrapper
) layout
)
579 (let ((cpl (compute-preliminary-cpl class
)))
580 (setf (layout-inherits layout
)
581 (order-layout-inherits
582 (map 'simple-vector
#'class-wrapper
583 (reverse (rest cpl
))))))
584 (register-layout layout
:invalidate t
)
585 (setf (classoid-layout classoid
) layout
)
586 (mapc #'make-preliminary-layout
(class-direct-subclasses class
)))))))
589 (defmethod shared-initialize :before
((class class
) slot-names
&key name
)
590 (declare (ignore slot-names name
))
591 ;; FIXME: Could this just be CLASS instead of `(CLASS ,CLASS)? If not,
592 ;; why not? (See also similar expression in !BOOTSTRAP-INITIALIZE-CLASS.)
593 (setf (slot-value class
'type
) `(class ,class
))
594 (setf (slot-value class
'class-eq-specializer
)
595 (make-instance 'class-eq-specializer
:class class
)))
597 (defmethod reinitialize-instance :before
((class slot-class
) &key
)
598 (remove-direct-subclasses class
(class-direct-superclasses class
))
599 (remove-slot-accessors class
(class-direct-slots class
)))
601 (defmethod reinitialize-instance :after
((class slot-class
)
604 (map-dependents class
606 (apply #'update-dependent class dependent initargs
))))
608 (defmethod shared-initialize :after
((class condition-class
) slot-names
609 &key direct-slots direct-superclasses
)
610 (declare (ignore slot-names
))
611 (let ((classoid (find-classoid (class-name class
))))
612 (with-slots (wrapper class-precedence-list prototype predicate-name
613 (direct-supers direct-superclasses
))
615 (setf (slot-value class
'direct-slots
)
616 (mapcar (lambda (pl) (make-direct-slotd class pl
))
618 (setf (slot-value class
'finalized-p
) t
)
619 (setf (classoid-pcl-class classoid
) class
)
620 (setq direct-supers direct-superclasses
)
621 (setq wrapper
(classoid-layout classoid
))
622 (setq class-precedence-list
(compute-class-precedence-list class
))
623 (setq prototype
(make-condition (class-name class
)))
624 (add-direct-subclasses class direct-superclasses
)
625 (setq predicate-name
(make-class-predicate-name (class-name class
)))
626 (make-class-predicate class predicate-name
)
627 (setf (slot-value class
'slots
) (compute-slots class
))))
628 ;; Comment from Gerd's PCL, 2003-05-15:
630 ;; We don't ADD-SLOT-ACCESSORS here because we don't want to
631 ;; override condition accessors with generic functions. We do this
633 (update-pv-table-cache-info class
))
635 (defmethod direct-slot-definition-class ((class condition-class
)
637 (declare (ignore initargs
))
638 (find-class 'condition-direct-slot-definition
))
640 (defmethod effective-slot-definition-class ((class condition-class
)
642 (declare (ignore initargs
))
643 (find-class 'condition-effective-slot-definition
))
645 (defmethod finalize-inheritance ((class condition-class
))
646 (aver (slot-value class
'finalized-p
))
649 (defmethod compute-effective-slot-definition
650 ((class condition-class
) slot-name dslotds
)
651 (let ((slotd (call-next-method)))
652 (setf (slot-definition-reader-function slotd
)
654 (handler-case (condition-reader-function x slot-name
)
655 ;; FIXME: FIND-SLOT-DEFAULT throws an error if the slot
656 ;; is unbound; maybe it should be a CELL-ERROR of some
658 (error () (slot-unbound class x slot-name
)))))
659 (setf (slot-definition-writer-function slotd
)
661 (condition-writer-function x v slot-name
)))
662 (setf (slot-definition-boundp-function slotd
)
664 (multiple-value-bind (v c
)
665 (ignore-errors (condition-reader-function x slot-name
))
670 (defmethod compute-slots ((class condition-class
))
671 (mapcan (lambda (superclass)
672 (mapcar (lambda (dslotd)
673 (compute-effective-slot-definition
674 class
(slot-definition-name dslotd
) (list dslotd
)))
675 (class-direct-slots superclass
)))
676 (reverse (slot-value class
'class-precedence-list
))))
678 (defmethod compute-slots :around
((class condition-class
))
679 (let ((eslotds (call-next-method)))
680 (mapc #'initialize-internal-slot-functions eslotds
)
683 (defmethod shared-initialize :after
684 ((slotd structure-slot-definition
) slot-names
&key
685 (allocation :instance
) allocation-class
)
686 (declare (ignore slot-names allocation-class
))
687 (unless (eq allocation
:instance
)
688 (error "Structure slots must have :INSTANCE allocation.")))
690 (defun make-structure-class-defstruct-form (name direct-slots include
)
691 (let* ((conc-name (intern (format nil
"~S structure class " name
)))
692 (constructor (intern (format nil
"~Aconstructor" conc-name
)))
693 (defstruct `(defstruct (,name
695 `((:include
,(class-name include
))))
697 (:conc-name
,conc-name
)
698 (:constructor
,constructor
())
700 ,@(mapcar (lambda (slot)
701 `(,(slot-definition-name slot
)
704 (reader-names (mapcar (lambda (slotd)
705 (list 'slot-accessor name
706 (slot-definition-name slotd
)
709 (writer-names (mapcar (lambda (slotd)
710 (list 'slot-accessor name
711 (slot-definition-name slotd
)
715 (mapcar (lambda (slotd reader-name
)
717 (slot-definition-defstruct-accessor-symbol
719 `(defun ,reader-name
(obj)
720 (declare (type ,name obj
))
722 direct-slots reader-names
))
724 (mapcar (lambda (slotd writer-name
)
726 (slot-definition-defstruct-accessor-symbol
728 `(defun ,writer-name
(nv obj
)
729 (declare (type ,name obj
))
730 (setf (,accessor obj
) nv
))))
731 direct-slots writer-names
))
735 ,@readers-init
,@writers-init
737 (values defstruct-form constructor reader-names writer-names
)))
739 (defun make-defstruct-allocation-function (class)
740 (let ((dd (get-structure-dd (class-name class
))))
742 (let ((instance (%make-instance
(dd-length dd
)))
743 (raw-index (dd-raw-index dd
)))
744 (setf (%instance-layout instance
)
745 (sb-kernel::compiler-layout-or-lose
(dd-name dd
)))
747 (setf (%instance-ref instance raw-index
)
748 (make-array (dd-raw-length dd
)
749 :element-type
'(unsigned-byte 32))))
752 (defmethod shared-initialize :after
753 ((class structure-class
)
755 &key
(direct-superclasses nil direct-superclasses-p
)
756 (direct-slots nil direct-slots-p
)
757 direct-default-initargs
758 (predicate-name nil predicate-name-p
))
759 (declare (ignore slot-names direct-default-initargs
))
760 (if direct-superclasses-p
761 (setf (slot-value class
'direct-superclasses
)
762 (or direct-superclasses
763 (setq direct-superclasses
764 (and (not (eq (class-name class
) 'structure-object
))
765 (list *the-class-structure-object
*)))))
766 (setq direct-superclasses
(slot-value class
'direct-superclasses
)))
767 (let* ((name (class-name class
))
768 (from-defclass-p (slot-value class
'from-defclass-p
))
769 (defstruct-p (or from-defclass-p
(not (structure-type-p name
)))))
771 (setf (slot-value class
'direct-slots
)
775 (let* ((slot-name (getf pl
:name
))
778 "~S structure class ~A"
780 (accessor (intern acc-name
)))
781 (setq pl
(list* :defstruct-accessor-symbol
783 (make-direct-slotd class pl
))
785 (setq direct-slots
(slot-value class
'direct-slots
)))
787 (let ((include (car (slot-value class
'direct-superclasses
))))
788 (multiple-value-bind (defstruct-form constructor reader-names writer-names
)
789 (make-structure-class-defstruct-form name direct-slots include
)
790 (unless (structure-type-p name
) (eval defstruct-form
))
791 (mapc (lambda (dslotd reader-name writer-name
)
792 (let* ((reader (gdefinition reader-name
))
793 (writer (when (gboundp writer-name
)
794 (gdefinition writer-name
))))
795 (setf (slot-value dslotd
'internal-reader-function
)
797 (setf (slot-value dslotd
'internal-writer-function
)
799 direct-slots reader-names writer-names
)
800 (setf (slot-value class
'defstruct-form
) defstruct-form
)
801 (setf (slot-value class
'defstruct-constructor
) constructor
)))
802 (setf (slot-value class
'defstruct-constructor
)
803 (make-defstruct-allocation-function class
)))
804 (add-direct-subclasses class direct-superclasses
)
805 (setf (slot-value class
'class-precedence-list
)
806 (compute-class-precedence-list class
))
807 (setf (slot-value class
'slots
) (compute-slots class
))
808 (let ((lclass (find-classoid (class-name class
))))
809 (setf (classoid-pcl-class lclass
) class
)
810 (setf (slot-value class
'wrapper
) (classoid-layout lclass
)))
811 (setf (slot-value class
'finalized-p
) t
)
812 (update-pv-table-cache-info class
)
813 (setq predicate-name
(if predicate-name-p
814 (setf (slot-value class
'predicate-name
)
815 (car predicate-name
))
816 (or (slot-value class
'predicate-name
)
817 (setf (slot-value class
'predicate-name
)
818 (make-class-predicate-name
819 (class-name class
))))))
820 (make-class-predicate class predicate-name
)
821 (add-slot-accessors class direct-slots
)))
823 (defmethod direct-slot-definition-class ((class structure-class
) &rest initargs
)
824 (declare (ignore initargs
))
825 (find-class 'structure-direct-slot-definition
))
827 (defmethod finalize-inheritance ((class structure-class
))
828 nil
) ; always finalized
830 (defun add-slot-accessors (class dslotds
)
831 (fix-slot-accessors class dslotds
'add
))
833 (defun remove-slot-accessors (class dslotds
)
834 (fix-slot-accessors class dslotds
'remove
))
836 (defun fix-slot-accessors (class dslotds add
/remove
)
837 (flet ((fix (gfspec name r
/w
)
838 (let ((gf (ensure-generic-function gfspec
)))
840 (r (if (eq add
/remove
'add
)
841 (add-reader-method class gf name
)
842 (remove-reader-method class gf
)))
843 (w (if (eq add
/remove
'add
)
844 (add-writer-method class gf name
)
845 (remove-writer-method class gf
)))))))
846 (dolist (dslotd dslotds
)
847 (let ((slot-name (slot-definition-name dslotd
)))
848 (dolist (r (slot-definition-readers dslotd
)) (fix r slot-name
'r
))
849 (dolist (w (slot-definition-writers dslotd
)) (fix w slot-name
'w
))))))
851 (defun add-direct-subclasses (class supers
)
852 (dolist (super supers
)
853 (unless (memq class
(class-direct-subclasses class
))
854 (add-direct-subclass super class
))))
856 (defun remove-direct-subclasses (class supers
)
857 (let ((old (class-direct-superclasses class
)))
858 (dolist (o (set-difference old supers
))
859 (remove-direct-subclass o class
))))
861 (defmethod finalize-inheritance ((class std-class
))
862 (update-class class t
))
864 (defmethod finalize-inheritance ((class forward-referenced-class
))
865 ;; FIXME: should we not be thinking a bit about what kinds of error
866 ;; we're throwing? Maybe we need a clos-error type to mix in? Or
867 ;; possibly a forward-referenced-class-error, though that's
868 ;; difficult given e.g. class precedence list calculations...
870 "~@<FINALIZE-INHERITANCE was called on a forward referenced class:~
875 (defun class-has-a-forward-referenced-superclass-p (class)
876 (or (forward-referenced-class-p class
)
877 (some #'class-has-a-forward-referenced-superclass-p
878 (class-direct-superclasses class
))))
880 ;;; This is called by :after shared-initialize whenever a class is initialized
881 ;;; or reinitialized. The class may or may not be finalized.
882 (defun update-class (class finalizep
)
883 ;; Comment from Gerd Moellmann:
885 ;; Note that we can't simply delay the finalization when CLASS has
886 ;; no forward referenced superclasses because that causes bootstrap
888 (when (and (not finalizep
)
889 (not (class-finalized-p class
))
890 (not (class-has-a-forward-referenced-superclass-p class
)))
891 (finalize-inheritance class
)
892 (return-from update-class
))
893 (when (or finalizep
(class-finalized-p class
)
894 (not (class-has-a-forward-referenced-superclass-p class
)))
895 (setf (find-class (class-name class
)) class
)
896 (update-cpl class
(compute-class-precedence-list class
))
897 ;; This invocation of UPDATE-SLOTS, in practice, finalizes the
898 ;; class. The hoops above are to ensure that FINALIZE-INHERITANCE
899 ;; is called at finalization, so that MOP programmers can hook
900 ;; into the system as described in "Class Finalization Protocol"
901 ;; (section 5.5.2 of AMOP).
902 (update-slots class
(compute-slots class
))
903 (update-gfs-of-class class
)
904 (update-inits class
(compute-default-initargs class
))
905 (update-shared-slot-values class
)
906 (update-ctors 'finalize-inheritance
:class class
))
908 (dolist (sub (class-direct-subclasses class
)) (update-class sub nil
))))
910 (defun update-shared-slot-values (class)
911 (dolist (slot (class-slots class
))
912 (when (eq (slot-definition-allocation slot
) :class
)
913 (let ((cell (assq (slot-definition-name slot
) (class-slot-cells class
))))
915 (let ((initfn (slot-definition-initfunction slot
)))
917 (setf (cdr cell
) (funcall initfn
)))))))))
919 (defun update-cpl (class cpl
)
920 (if (class-finalized-p class
)
921 (unless (and (equal (class-precedence-list class
) cpl
)
923 (when (position :class
(class-direct-slots c
)
924 :key
#'slot-definition-allocation
)
926 ;; comment from the old CMU CL sources:
927 ;; Need to have the cpl setup before update-lisp-class-layout
928 ;; is called on CMU CL.
929 (setf (slot-value class
'class-precedence-list
) cpl
)
930 (force-cache-flushes class
))
931 (setf (slot-value class
'class-precedence-list
) cpl
))
932 (update-class-can-precede-p cpl
))
934 (defun update-class-can-precede-p (cpl)
936 (let ((first (car cpl
)))
937 (dolist (c (cdr cpl
))
938 (pushnew c
(slot-value first
'can-precede-list
))))
939 (update-class-can-precede-p (cdr cpl
))))
941 (defun class-can-precede-p (class1 class2
)
942 (member class2
(class-can-precede-list class1
)))
944 (defun update-slots (class eslotds
)
945 (let ((instance-slots ())
947 (dolist (eslotd eslotds
)
948 (let ((alloc (slot-definition-allocation eslotd
)))
950 (:instance
(push eslotd instance-slots
))
951 (:class
(push eslotd class-slots
)))))
953 ;; If there is a change in the shape of the instances then the
954 ;; old class is now obsolete.
955 (let* ((nlayout (mapcar #'slot-definition-name
956 (sort instance-slots
#'<
957 :key
#'slot-definition-location
)))
958 (nslots (length nlayout
))
959 (nwrapper-class-slots (compute-class-slots class-slots
))
960 (owrapper (when (class-finalized-p class
)
961 (class-wrapper class
)))
962 (olayout (when owrapper
963 (wrapper-instance-slots-layout owrapper
)))
964 (owrapper-class-slots (and owrapper
(wrapper-class-slots owrapper
)))
966 (cond ((null owrapper
)
967 (make-wrapper nslots class
))
968 ((and (equal nlayout olayout
)
970 (loop for o in owrapper-class-slots
971 for n in nwrapper-class-slots
972 do
(unless (eq (car o
) (car n
)) (return t
)))))
975 ;; This will initialize the new wrapper to have the
976 ;; same state as the old wrapper. We will then have
977 ;; to change that. This may seem like wasted work
978 ;; (and it is), but the spec requires that we call
979 ;; MAKE-INSTANCES-OBSOLETE.
980 (make-instances-obsolete class
)
981 (class-wrapper class
)))))
983 (with-slots (wrapper slots
) class
984 (update-lisp-class-layout class nwrapper
)
986 (wrapper-instance-slots-layout nwrapper
) nlayout
987 (wrapper-class-slots nwrapper
) nwrapper-class-slots
988 (wrapper-no-of-instance-slots nwrapper
) nslots
990 (setf (slot-value class
'finalized-p
) t
)
991 (unless (eq owrapper nwrapper
)
992 (update-pv-table-cache-info class
)))))
994 (defun compute-class-slots (eslotds)
996 (dolist (eslotd eslotds
)
997 (push (assoc (slot-definition-name eslotd
)
998 (class-slot-cells (slot-definition-class eslotd
)))
1000 (nreverse collect
)))
1002 (defun update-gfs-of-class (class)
1003 (when (and (class-finalized-p class
)
1004 (let ((cpl (class-precedence-list class
)))
1005 (or (member *the-class-slot-class
* cpl
)
1006 (member *the-class-standard-effective-slot-definition
*
1008 (let ((gf-table (make-hash-table :test
'eq
)))
1009 (labels ((collect-gfs (class)
1010 (dolist (gf (specializer-direct-generic-functions class
))
1011 (setf (gethash gf gf-table
) t
))
1012 (mapc #'collect-gfs
(class-direct-superclasses class
))))
1014 (maphash (lambda (gf ignore
)
1015 (declare (ignore ignore
))
1016 (update-gf-dfun class gf
))
1019 (defun update-inits (class inits
)
1020 (setf (plist-value class
'default-initargs
) inits
))
1022 (defmethod compute-default-initargs ((class slot-class
))
1023 (let ((initargs (loop for c in
(class-precedence-list class
)
1024 append
(class-direct-default-initargs c
))))
1025 (delete-duplicates initargs
:test
#'eq
:key
#'car
:from-end t
)))
1027 ;;;; protocols for constructing direct and effective slot definitions
1029 (defmethod direct-slot-definition-class ((class std-class
) &rest initargs
)
1030 (declare (ignore initargs
))
1031 (find-class 'standard-direct-slot-definition
))
1033 (defun make-direct-slotd (class initargs
)
1034 (let ((initargs (list* :class class initargs
)))
1035 (apply #'make-instance
1036 (apply #'direct-slot-definition-class class initargs
)
1039 (defmethod compute-slots ((class std-class
))
1040 ;; As specified, we must call COMPUTE-EFFECTIVE-SLOT-DEFINITION once
1041 ;; for each different slot name we find in our superclasses. Each
1042 ;; call receives the class and a list of the dslotds with that name.
1043 ;; The list is in most-specific-first order.
1044 (let ((name-dslotds-alist ()))
1045 (dolist (c (class-precedence-list class
))
1046 (dolist (slot (class-direct-slots c
))
1047 (let* ((name (slot-definition-name slot
))
1048 (entry (assq name name-dslotds-alist
)))
1050 (push slot
(cdr entry
))
1051 (push (list name slot
) name-dslotds-alist
)))))
1052 (mapcar (lambda (direct)
1053 (compute-effective-slot-definition class
1055 (nreverse (cdr direct
))))
1056 name-dslotds-alist
)))
1058 (defmethod compute-slots ((class standard-class
))
1061 (defmethod compute-slots :around
((class standard-class
))
1062 (let ((eslotds (call-next-method))
1064 (dolist (eslotd eslotds eslotds
)
1065 (setf (slot-definition-location eslotd
)
1066 (ecase (slot-definition-allocation eslotd
)
1070 (let* ((name (slot-definition-name eslotd
))
1071 (from-class (slot-definition-allocation-class eslotd
))
1072 (cell (assq name
(class-slot-cells from-class
))))
1075 (initialize-internal-slot-functions eslotd
))))
1077 (defmethod compute-slots ((class funcallable-standard-class
))
1080 (defmethod compute-slots :around
((class funcallable-standard-class
))
1081 (labels ((instance-slot-names (slotds)
1083 (dolist (slotd slotds
(nreverse collect
))
1084 (when (eq (slot-definition-allocation slotd
) :instance
)
1085 (push (slot-definition-name slotd
) collect
)))))
1086 ;; This sorts slots so that slots of classes later in the CPL
1087 ;; come before slots of other classes. This is crucial for
1088 ;; funcallable instances because it ensures that the slots of
1089 ;; FUNCALLABLE-STANDARD-OBJECT, which includes the slots of
1090 ;; KERNEL:FUNCALLABLE-INSTANCE, come first, which in turn
1091 ;; makes it possible to treat FUNCALLABLE-STANDARD-OBJECT as
1092 ;; a funcallable instance.
1093 (compute-layout (eslotds)
1095 (names (instance-slot-names eslotds
)))
1097 (reverse (class-precedence-list class
))
1098 (nreverse (nconc names first
)))
1099 (dolist (ss (class-slots class
))
1100 (let ((name (slot-definition-name ss
)))
1101 (when (member name names
)
1103 (setq names
(delete name names
)))))))))
1104 (let ((all-slotds (call-next-method))
1107 (dolist (slotd all-slotds
)
1108 (ecase (slot-definition-allocation slotd
)
1109 (:instance
(push slotd instance-slots
))
1110 (:class
(push slotd class-slots
))))
1111 (let ((layout (compute-layout instance-slots
)))
1112 (dolist (slotd instance-slots
)
1113 (setf (slot-definition-location slotd
)
1114 (position (slot-definition-name slotd
) layout
))
1115 (initialize-internal-slot-functions slotd
)))
1116 (dolist (slotd class-slots
)
1117 (let ((name (slot-definition-name slotd
))
1118 (from-class (slot-definition-allocation-class slotd
)))
1119 (setf (slot-definition-location slotd
)
1120 (assoc name
(class-slot-cells from-class
)))
1121 (aver (consp (slot-definition-location slotd
)))
1122 (initialize-internal-slot-functions slotd
)))
1125 (defmethod compute-slots ((class structure-class
))
1126 (mapcan (lambda (superclass)
1127 (mapcar (lambda (dslotd)
1128 (compute-effective-slot-definition
1130 (slot-definition-name dslotd
)
1132 (class-direct-slots superclass
)))
1133 (reverse (slot-value class
'class-precedence-list
))))
1135 (defmethod compute-slots :around
((class structure-class
))
1136 (let ((eslotds (call-next-method)))
1137 (mapc #'initialize-internal-slot-functions eslotds
)
1140 (defmethod compute-effective-slot-definition ((class slot-class
) name dslotds
)
1141 (declare (ignore name
))
1142 (let* ((initargs (compute-effective-slot-definition-initargs class dslotds
))
1143 (class (apply #'effective-slot-definition-class class initargs
)))
1144 (apply #'make-instance class initargs
)))
1146 (defmethod effective-slot-definition-class ((class std-class
) &rest initargs
)
1147 (declare (ignore initargs
))
1148 (find-class 'standard-effective-slot-definition
))
1150 (defmethod effective-slot-definition-class ((class structure-class
) &rest initargs
)
1151 (declare (ignore initargs
))
1152 (find-class 'structure-effective-slot-definition
))
1154 (defmethod compute-effective-slot-definition-initargs
1155 ((class slot-class
) direct-slotds
)
1161 (allocation-class nil
)
1167 (dolist (slotd direct-slotds
)
1170 (setq name
(slot-definition-name slotd
)
1173 (when (slot-definition-initfunction slotd
)
1174 (setq initform
(slot-definition-initform slotd
)
1175 initfunction
(slot-definition-initfunction slotd
)
1178 (setq allocation
(slot-definition-allocation slotd
)
1179 allocation-class
(slot-definition-class slotd
)
1181 (setq initargs
(append (slot-definition-initargs slotd
) initargs
))
1182 (let ((slotd-type (slot-definition-type slotd
)))
1183 (setq type
(cond ((eq type t
) slotd-type
)
1184 ((*subtypep type slotd-type
) type
)
1185 (t `(and ,type
,slotd-type
)))))))
1188 :initfunction initfunction
1190 :allocation allocation
1191 :allocation-class allocation-class
1195 (defmethod compute-effective-slot-definition-initargs :around
1196 ((class structure-class
) direct-slotds
)
1197 (let ((slotd (car direct-slotds
)))
1198 (list* :defstruct-accessor-symbol
1199 (slot-definition-defstruct-accessor-symbol slotd
)
1200 :internal-reader-function
1201 (slot-definition-internal-reader-function slotd
)
1202 :internal-writer-function
1203 (slot-definition-internal-writer-function slotd
)
1204 (call-next-method))))
1206 ;;; NOTE: For bootstrapping considerations, these can't use MAKE-INSTANCE
1207 ;;; to make the method object. They have to use make-a-method which
1208 ;;; is a specially bootstrapped mechanism for making standard methods.
1209 (defmethod reader-method-class ((class slot-class
) direct-slot
&rest initargs
)
1210 (declare (ignore direct-slot initargs
))
1211 (find-class 'standard-reader-method
))
1213 (defmethod add-reader-method ((class slot-class
) generic-function slot-name
)
1214 (add-method generic-function
1215 (make-a-method 'standard-reader-method
1217 (list (or (class-name class
) 'object
))
1219 (make-reader-method-function class slot-name
)
1220 "automatically generated reader method"
1223 (defmethod writer-method-class ((class slot-class
) direct-slot
&rest initargs
)
1224 (declare (ignore direct-slot initargs
))
1225 (find-class 'standard-writer-method
))
1227 (defmethod add-writer-method ((class slot-class
) generic-function slot-name
)
1228 (add-method generic-function
1229 (make-a-method 'standard-writer-method
1231 (list 'new-value
(or (class-name class
) 'object
))
1232 (list *the-class-t
* class
)
1233 (make-writer-method-function class slot-name
)
1234 "automatically generated writer method"
1237 (defmethod add-boundp-method ((class slot-class
) generic-function slot-name
)
1238 (add-method generic-function
1239 (make-a-method 'standard-boundp-method
1241 (list (or (class-name class
) 'object
))
1243 (make-boundp-method-function class slot-name
)
1244 "automatically generated boundp method"
1247 (defmethod remove-reader-method ((class slot-class
) generic-function
)
1248 (let ((method (get-method generic-function
() (list class
) nil
)))
1249 (when method
(remove-method generic-function method
))))
1251 (defmethod remove-writer-method ((class slot-class
) generic-function
)
1253 (get-method generic-function
() (list *the-class-t
* class
) nil
)))
1254 (when method
(remove-method generic-function method
))))
1256 (defmethod remove-boundp-method ((class slot-class
) generic-function
)
1257 (let ((method (get-method generic-function
() (list class
) nil
)))
1258 (when method
(remove-method generic-function method
))))
1260 ;;; MAKE-READER-METHOD-FUNCTION and MAKE-WRITE-METHOD function are NOT
1261 ;;; part of the standard protocol. They are however useful, PCL makes
1262 ;;; use of them internally and documents them for PCL users.
1264 ;;; *** This needs work to make type testing by the writer functions which
1265 ;;; *** do type testing faster. The idea would be to have one constructor
1266 ;;; *** for each possible type test.
1268 ;;; *** There is a subtle bug here which is going to have to be fixed.
1269 ;;; *** Namely, the simplistic use of the template has to be fixed. We
1270 ;;; *** have to give the OPTIMIZE-SLOT-VALUE method the user might have
1271 ;;; *** defined for this metaclass a chance to run.
1273 (defmethod make-reader-method-function ((class slot-class
) slot-name
)
1274 (make-std-reader-method-function (class-name class
) slot-name
))
1276 (defmethod make-writer-method-function ((class slot-class
) slot-name
)
1277 (make-std-writer-method-function (class-name class
) slot-name
))
1279 (defmethod make-boundp-method-function ((class slot-class
) slot-name
)
1280 (make-std-boundp-method-function (class-name class
) slot-name
))
1282 (defmethod compatible-meta-class-change-p (class proto-new-class
)
1283 (eq (class-of class
) (class-of proto-new-class
)))
1285 (defmethod validate-superclass ((class class
) (new-super class
))
1286 (or (eq new-super
*the-class-t
*)
1287 (eq (class-of class
) (class-of new-super
))))
1289 (defmethod validate-superclass ((class standard-class
) (new-super std-class
))
1290 (let ((new-super-meta-class (class-of new-super
)))
1291 (or (eq new-super-meta-class
*the-class-std-class
*)
1292 (eq (class-of class
) new-super-meta-class
))))
1294 ;;; What this does depends on which of the four possible values of
1295 ;;; LAYOUT-INVALID the PCL wrapper has; the simplest case is when it
1296 ;;; is (:FLUSH <wrapper>) or (:OBSOLETE <wrapper>), when there is
1297 ;;; nothing to do, as the new wrapper has already been created. If
1298 ;;; LAYOUT-INVALID returns NIL, then we invalidate it (setting it to
1299 ;;; (:FLUSH <wrapper>); UPDATE-SLOTS later gets to choose whether or
1300 ;;; not to "upgrade" this to (:OBSOLETE <wrapper>).
1302 ;;; This leaves the case where LAYOUT-INVALID returns T, which happens
1303 ;;; when REGISTER-LAYOUT has invalidated a superclass of CLASS (which
1304 ;;; invalidated all the subclasses in SB-KERNEL land). Again, here we
1305 ;;; must flush the caches and allow UPDATE-SLOTS to decide whether to
1306 ;;; obsolete the wrapper.
1308 ;;; FIXME: either here or in INVALID-WRAPPER-P looks like a good place
1309 ;;; for (AVER (NOT (EQ (LAYOUT-INVALID OWRAPPER)
1310 ;;; :UNINITIALIZED)))
1312 ;;; Thanks to Gerd Moellmann for the explanation. -- CSR, 2002-10-29
1313 (defun force-cache-flushes (class)
1314 (let* ((owrapper (class-wrapper class
)))
1315 ;; We only need to do something if the wrapper is still valid. If
1316 ;; the wrapper isn't valid, state will be FLUSH or OBSOLETE, and
1317 ;; both of those will already be doing what we want. In
1318 ;; particular, we must be sure we never change an OBSOLETE into a
1319 ;; FLUSH since OBSOLETE means do what FLUSH does and then some.
1320 (when (or (not (invalid-wrapper-p owrapper
))
1321 ;; KLUDGE: despite the observations above, this remains
1322 ;; a violation of locality or what might be considered
1323 ;; good style. There has to be a better way! -- CSR,
1325 (eq (layout-invalid owrapper
) t
))
1326 (let ((nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper
)
1328 (setf (wrapper-instance-slots-layout nwrapper
)
1329 (wrapper-instance-slots-layout owrapper
))
1330 (setf (wrapper-class-slots nwrapper
)
1331 (wrapper-class-slots owrapper
))
1333 (update-lisp-class-layout class nwrapper
)
1334 (setf (slot-value class
'wrapper
) nwrapper
)
1335 (invalidate-wrapper owrapper
:flush nwrapper
))))))
1337 (defun flush-cache-trap (owrapper nwrapper instance
)
1338 (declare (ignore owrapper
))
1339 (set-wrapper instance nwrapper
))
1341 ;;; MAKE-INSTANCES-OBSOLETE can be called by user code. It will cause
1342 ;;; the next access to the instance (as defined in 88-002R) to trap
1343 ;;; through the UPDATE-INSTANCE-FOR-REDEFINED-CLASS mechanism.
1344 (defmethod make-instances-obsolete ((class std-class
))
1345 (let* ((owrapper (class-wrapper class
))
1346 (nwrapper (make-wrapper (wrapper-no-of-instance-slots owrapper
)
1348 (setf (wrapper-instance-slots-layout nwrapper
)
1349 (wrapper-instance-slots-layout owrapper
))
1350 (setf (wrapper-class-slots nwrapper
)
1351 (wrapper-class-slots owrapper
))
1353 (update-lisp-class-layout class nwrapper
)
1354 (setf (slot-value class
'wrapper
) nwrapper
)
1355 (invalidate-wrapper owrapper
:obsolete nwrapper
)
1358 (defmethod make-instances-obsolete ((class symbol
))
1359 (make-instances-obsolete (find-class class
)))
1361 ;;; OBSOLETE-INSTANCE-TRAP is the internal trap that is called when we
1362 ;;; see an obsolete instance. The times when it is called are:
1363 ;;; - when the instance is involved in method lookup
1364 ;;; - when attempting to access a slot of an instance
1366 ;;; It is not called by class-of, wrapper-of, or any of the low-level
1367 ;;; instance access macros.
1369 ;;; Of course these times when it is called are an internal
1370 ;;; implementation detail of PCL and are not part of the documented
1371 ;;; description of when the obsolete instance update happens. The
1372 ;;; documented description is as it appears in 88-002R.
1374 ;;; This has to return the new wrapper, so it counts on all the
1375 ;;; methods on obsolete-instance-trap-internal to return the new
1376 ;;; wrapper. It also does a little internal error checking to make
1377 ;;; sure that the traps are only happening when they should, and that
1378 ;;; the trap methods are computing appropriate new wrappers.
1380 ;;; OBSOLETE-INSTANCE-TRAP might be called on structure instances
1381 ;;; after a structure is redefined. In most cases,
1382 ;;; OBSOLETE-INSTANCE-TRAP will not be able to fix the old instance,
1383 ;;; so it must signal an error. The hard part of this is that the
1384 ;;; error system and debugger might cause OBSOLETE-INSTANCE-TRAP to be
1385 ;;; called again, so in that case, we have to return some reasonable
1386 ;;; wrapper, instead.
1388 (defvar *in-obsolete-instance-trap
* nil
)
1389 (defvar *the-wrapper-of-structure-object
*
1390 (class-wrapper (find-class 'structure-object
)))
1392 (define-condition obsolete-structure
(error)
1393 ((datum :reader obsolete-structure-datum
:initarg
:datum
))
1395 (lambda (condition stream
)
1396 ;; Don't try to print the structure, since it probably won't work.
1398 "~@<obsolete structure error for a structure of type ~2I~_~S~:>"
1399 (type-of (obsolete-structure-datum condition
))))))
1401 (defun obsolete-instance-trap (owrapper nwrapper instance
)
1402 (if (not (pcl-instance-p instance
))
1403 (if *in-obsolete-instance-trap
*
1404 *the-wrapper-of-structure-object
*
1405 (let ((*in-obsolete-instance-trap
* t
))
1406 (error 'obsolete-structure
:datum instance
)))
1407 (let* ((class (wrapper-class* nwrapper
))
1408 (copy (allocate-instance class
)) ;??? allocate-instance ???
1409 (olayout (wrapper-instance-slots-layout owrapper
))
1410 (nlayout (wrapper-instance-slots-layout nwrapper
))
1411 (oslots (get-slots instance
))
1412 (nslots (get-slots copy
))
1413 (oclass-slots (wrapper-class-slots owrapper
))
1417 ;; local --> local transfer
1418 ;; local --> shared discard
1419 ;; local --> -- discard
1420 ;; shared --> local transfer
1421 ;; shared --> shared discard
1422 ;; shared --> -- discard
1426 ;; Go through all the old local slots.
1428 (dolist (name olayout
)
1429 (let ((npos (posq name nlayout
)))
1431 (setf (clos-slots-ref nslots npos
)
1432 (clos-slots-ref oslots opos
))
1434 (push name discarded
)
1435 (unless (eq (clos-slots-ref oslots opos
) +slot-unbound
+)
1436 (setf (getf plist name
) (clos-slots-ref oslots opos
))))))
1439 ;; Go through all the old shared slots.
1440 (dolist (oclass-slot-and-val oclass-slots
)
1441 (let ((name (car oclass-slot-and-val
))
1442 (val (cdr oclass-slot-and-val
)))
1443 (let ((npos (posq name nlayout
)))
1445 (setf (clos-slots-ref nslots npos
) (cdr oclass-slot-and-val
))
1446 (progn (push name discarded
)
1447 (unless (eq val
+slot-unbound
+)
1448 (setf (getf plist name
) val
)))))))
1450 ;; Go through all the new local slots to compute the added slots.
1451 (dolist (nlocal nlayout
)
1452 (unless (or (memq nlocal olayout
)
1453 (assq nlocal oclass-slots
))
1454 (push nlocal added
)))
1456 (swap-wrappers-and-slots instance copy
)
1458 (update-instance-for-redefined-class instance
1464 (defun change-class-internal (instance new-class initargs
)
1465 (let* ((old-class (class-of instance
))
1466 (copy (allocate-instance new-class
))
1467 (new-wrapper (get-wrapper copy
))
1468 (old-wrapper (class-wrapper old-class
))
1469 (old-layout (wrapper-instance-slots-layout old-wrapper
))
1470 (new-layout (wrapper-instance-slots-layout new-wrapper
))
1471 (old-slots (get-slots instance
))
1472 (new-slots (get-slots copy
))
1473 (old-class-slots (wrapper-class-slots old-wrapper
)))
1475 ;; "The values of local slots specified by both the class CTO and
1476 ;; CFROM are retained. If such a local slot was unbound, it
1477 ;; remains unbound."
1478 (let ((new-position 0))
1479 (dolist (new-slot new-layout
)
1480 (let ((old-position (posq new-slot old-layout
)))
1482 (setf (clos-slots-ref new-slots new-position
)
1483 (clos-slots-ref old-slots old-position
))))
1484 (incf new-position
)))
1486 ;; "The values of slots specified as shared in the class CFROM and
1487 ;; as local in the class CTO are retained."
1488 (dolist (slot-and-val old-class-slots
)
1489 (let ((position (posq (car slot-and-val
) new-layout
)))
1491 (setf (clos-slots-ref new-slots position
) (cdr slot-and-val
)))))
1493 ;; Make the copy point to the old instance's storage, and make the
1494 ;; old instance point to the new storage.
1495 (swap-wrappers-and-slots instance copy
)
1497 (apply #'update-instance-for-different-class copy instance initargs
)
1500 (defmethod change-class ((instance standard-object
)
1501 (new-class standard-class
)
1503 (change-class-internal instance new-class initargs
))
1505 (defmethod change-class ((instance funcallable-standard-object
)
1506 (new-class funcallable-standard-class
)
1508 (change-class-internal instance new-class initargs
))
1510 (defmethod change-class ((instance standard-object
)
1511 (new-class funcallable-standard-class
)
1513 (declare (ignore initargs
))
1514 (error "You can't change the class of ~S to ~S~@
1515 because it isn't already an instance with metaclass ~S."
1516 instance new-class
'standard-class
))
1518 (defmethod change-class ((instance funcallable-standard-object
)
1519 (new-class standard-class
)
1521 (declare (ignore initargs
))
1522 (error "You can't change the class of ~S to ~S~@
1523 because it isn't already an instance with metaclass ~S."
1524 instance new-class
'funcallable-standard-class
))
1526 (defmethod change-class ((instance t
) (new-class-name symbol
) &rest initargs
)
1527 (apply #'change-class instance
(find-class new-class-name
) initargs
))
1529 ;;;; The metaclass BUILT-IN-CLASS
1531 ;;;; This metaclass is something of a weird creature. By this point, all
1532 ;;;; instances of it which will exist have been created, and no instance
1533 ;;;; is ever created by calling MAKE-INSTANCE.
1535 ;;;; But, there are other parts of the protocol we must follow and those
1536 ;;;; definitions appear here.
1538 (defmethod shared-initialize :before
1539 ((class built-in-class
) slot-names
&rest initargs
)
1540 (declare (ignore slot-names initargs
))
1541 (error "attempt to initialize or reinitialize a built in class"))
1543 (defmethod class-direct-slots ((class built-in-class
)) ())
1544 (defmethod class-slots ((class built-in-class
)) ())
1545 (defmethod class-direct-default-initargs ((class built-in-class
)) ())
1546 (defmethod class-default-initargs ((class built-in-class
)) ())
1548 (defmethod validate-superclass ((c class
) (s built-in-class
))
1549 (or (eq s
*the-class-t
*)
1550 (eq s
*the-class-stream
*)))
1552 ;;; Some necessary methods for FORWARD-REFERENCED-CLASS
1553 (defmethod class-direct-slots ((class forward-referenced-class
)) ())
1554 (defmethod class-direct-default-initargs ((class forward-referenced-class
)) ())
1555 (macrolet ((def (method)
1556 `(defmethod ,method
((class forward-referenced-class
))
1557 (error "~@<~I~S was called on a forward referenced class:~2I~_~S~:>"
1559 (def class-default-initargs
)
1560 (def class-precedence-list
)
1563 (defmethod validate-superclass ((c slot-class
)
1564 (f forward-referenced-class
))
1567 (defmethod add-dependent ((metaobject dependent-update-mixin
) dependent
)
1568 (pushnew dependent
(plist-value metaobject
'dependents
)))
1570 (defmethod remove-dependent ((metaobject dependent-update-mixin
) dependent
)
1571 (setf (plist-value metaobject
'dependents
)
1572 (delete dependent
(plist-value metaobject
'dependents
))))
1574 (defmethod map-dependents ((metaobject dependent-update-mixin
) function
)
1575 (dolist (dependent (plist-value metaobject
'dependents
))
1576 (funcall function dependent
)))