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Last change on this file since 15427 was 15427, checked in by Mark Evenson, 2 years ago

Always define CALL-NEXT-METHOD and NEXT-METHOD-P as local functions

This doesn't seem to entirely work. Need a better test?

Attempts to address <https://github.com/armedbear/abcl/issues/301>

Property svn:eol-style set to native
Property svn:keywords set to Id

File size: 205.9 KB

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1	;;; clos.lisp
2	;;;
3	;;; Copyright (C) 2003-2007 Peter Graves
4	;;; Copyright (C) 2010-2013 Mark Evenson
5	;;; $Id: clos.lisp 15427 2020-10-20 06:45:27Z mevenson $
6	;;;
7	;;; This program is free software; you can redistribute it and/or
8	;;; modify it under the terms of the GNU General Public License
9	;;; as published by the Free Software Foundation; either version 2
10	;;; of the License, or (at your option) any later version.
11	;;;
12	;;; This program is distributed in the hope that it will be useful,
13	;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14	;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	;;; GNU General Public License for more details.
16	;;;
17	;;; You should have received a copy of the GNU General Public License
18	;;; along with this program; if not, write to the Free Software
19	;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20	;;;
21	;;; As a special exception, the copyright holders of this library give you
22	;;; permission to link this library with independent modules to produce an
23	;;; executable, regardless of the license terms of these independent
24	;;; modules, and to copy and distribute the resulting executable under
25	;;; terms of your choice, provided that you also meet, for each linked
26	;;; independent module, the terms and conditions of the license of that
27	;;; module. An independent module is a module which is not derived from
28	;;; or based on this library. If you modify this library, you may extend
29	;;; this exception to your version of the library, but you are not
30	;;; obligated to do so. If you do not wish to do so, delete this
31	;;; exception statement from your version.
32
33	;;; Originally based on Closette.
34
35	;;; Closette Version 1.0 (February 10, 1991)
36	;;;
37	;;; Copyright (c) 1990, 1991 Xerox Corporation.
38	;;; All rights reserved.
39	;;;
40	;;; Use and copying of this software and preparation of derivative works
41	;;; based upon this software are permitted. Any distribution of this
42	;;; software or derivative works must comply with all applicable United
43	;;; States export control laws.
44	;;;
45	;;; This software is made available AS IS, and Xerox Corporation makes no
46	;;; warranty about the software, its performance or its conformity to any
47	;;; specification.
48	;;;
49	;;; Closette is an implementation of a subset of CLOS with a metaobject
50	;;; protocol as described in "The Art of The Metaobject Protocol",
51	;;; MIT Press, 1991.
52
53	(in-package #:mop)
54
55	(export '(%defgeneric canonicalize-direct-superclasses))
56
57
58	;;
59	;;
60	;;
61	;; In order to bootstrap CLOS, first implement the required API as
62	;; normal functions which only apply to the "root" metaclass
63	;; STANDARD-CLASS.
64	;;
65	;; After putting the normal functions in place, the building blocks
66	;; are in place to gradually swap the normal functions with
67	;; generic functions and methods.
68	;;
69	;; Some functionality implemented in the temporary regular functions
70	;; needs to be available later as a method definition to be dispatched
71	;; to for the standard case, e.g. with arguments of type STANDARD-CLASS
72	;; or STANDARD-GENERIC-FUNCTION. To prevent repeated code, the
73	;; functions are implemented in functions by the same name as the API
74	;; functions, but with the STD- prefix. These functions are sometimes
75	;; used in regular code as well, either in a "fast path" or to break a
76	;; circularity (e.g., within compute-discriminating-function when the
77	;; user adds a method to compute-discriminating-function).
78	;;
79	;; When hacking this file, note that some important parts are implemented
80	;; in the Java world. These Java bits can be found in the files
81	;;
82	;; * LispClass.java
83	;; * SlotClass.java
84	;; * StandardClass.java
85	;; * BuiltInClass.java
86	;; * StandardObject.java
87	;; * StandardObjectFunctions.java
88	;; * FuncallableStandardObject.java
89	;; * Layout.java
90	;;
91	;; In case of function names, those defined on the Java side can be
92	;; recognized by their prefixed percent (%) sign.
93	;;
94	;; The API functions need to be declaimed NOTINLINE explicitly, because
95	;; that prevents inlining in the current FASL (which is allowed by the
96	;; CLHS without the declaration); this is a hard requirement to in order
97	;; to be able to swap the symbol's function slot with a generic function
98	;; later on - with it actually being used.
99	;;
100	;;
101	;;
102	;; ### Note that the "declares all API functions as regular functions"
103	;; isn't true when I write the above, but it's definitely the target.
104	;;
105	;; A note about AMOP: the first chapters (and the sample Closette
106	;; implementation) of the book sometimes deviate from the specification.
107	;; For example, in the examples slot-value-using-class has the slot name
108	;; as third argument where in the specification it is the effective slot
109	;; definition. When in doubt, we aim to follow the specification, the
110	;; MOP test suite at http://common-lisp.net/project/closer/features.html
111	;; and the behavior of other CL implementations in preference to
112	;; chapters 1-4 and appendix D.
113
114	(defconstant +the-standard-class+ (find-class 'standard-class))
115	(defconstant +the-funcallable-standard-class+
116	(find-class 'funcallable-standard-class))
117	(defconstant +the-standard-object-class+ (find-class 'standard-object))
118	(defconstant +the-funcallable-standard-object-class+
119	(find-class 'funcallable-standard-object))
120	(defconstant +the-standard-method-class+ (find-class 'standard-method))
121	(defconstant +the-T-class+ (find-class 'T))
122	(defconstant +the-standard-slot-definition-class+ (find-class 'standard-slot-definition))
123	(defconstant +the-standard-direct-slot-definition-class+ (find-class 'standard-direct-slot-definition))
124	(defconstant +the-standard-effective-slot-definition-class+ (find-class 'standard-effective-slot-definition))
125
126	;; Don't use DEFVAR, because that disallows loading clos.lisp
127	;; after compiling it: the binding won't get assigned to T anymore
128	(defparameter clos-booting t)
129
130	(defmacro define-class->%class-forwarder (name)
131	(let* (($name (if (consp name) (cadr name) name))
132	(%name (intern (concatenate 'string
133	"%"
134	(if (consp name)
135	(symbol-name 'set-) "")
136	(symbol-name $name))
137	(symbol-package $name))))
138	`(progn
139	(declaim (notinline ,name))
140	(defun ,name (&rest args)
141	(apply #',%name args)))))
142
143	;;
144	;; DEFINE PLACE HOLDER FUNCTIONS
145	;;
146
147	(define-class->%class-forwarder class-name)
148	(define-class->%class-forwarder (setf class-name))
149	(define-class->%class-forwarder class-slots)
150	(define-class->%class-forwarder (setf class-slots))
151	(define-class->%class-forwarder class-direct-slots)
152	(define-class->%class-forwarder (setf class-direct-slots))
153	(define-class->%class-forwarder class-layout)
154	(define-class->%class-forwarder (setf class-layout))
155	(define-class->%class-forwarder class-direct-superclasses)
156	(define-class->%class-forwarder (setf class-direct-superclasses))
157	(define-class->%class-forwarder class-direct-subclasses)
158	(define-class->%class-forwarder (setf class-direct-subclasses))
159	(define-class->%class-forwarder class-direct-methods)
160	(define-class->%class-forwarder (setf class-direct-methods))
161	(define-class->%class-forwarder class-precedence-list)
162	(define-class->%class-forwarder (setf class-precedence-list))
163	(define-class->%class-forwarder class-finalized-p)
164	(define-class->%class-forwarder (setf class-finalized-p))
165	(define-class->%class-forwarder class-default-initargs)
166	(define-class->%class-forwarder (setf class-default-initargs))
167	(define-class->%class-forwarder class-direct-default-initargs)
168	(define-class->%class-forwarder (setf class-direct-default-initargs))
169
170	(declaim (notinline add-direct-subclass remove-direct-subclass))
171	(defun add-direct-subclass (superclass subclass)
172	(setf (class-direct-subclasses superclass)
173	(adjoin subclass (class-direct-subclasses superclass))))
174	(defun remove-direct-subclass (superclass subclass)
175	(setf (class-direct-subclasses superclass)
176	(remove subclass (class-direct-subclasses superclass))))
177
178	(defun fixup-standard-class-hierarchy ()
179	;; Make the result of class-direct-subclasses for the pre-built
180	;; classes agree with AMOP Table 5.1 (pg. 141). This could be done in
181	;; StandardClass.java where these classes are defined, but it's less
182	;; painful to do it Lisp-side.
183	(flet ((add-subclasses (class subclasses)
184	(when (atom subclasses) (setf subclasses (list subclasses)))
185	(setf (class-direct-subclasses (find-class class))
186	(union (class-direct-subclasses (find-class class))
187	(mapcar #'find-class subclasses)))))
188	(add-subclasses t 'standard-object)
189	(add-subclasses 'function 'funcallable-standard-object)
190	(add-subclasses 'standard-object '(funcallable-standard-object metaobject))
191	(add-subclasses 'metaobject
192	'(method slot-definition specializer))
193	(add-subclasses 'specializer '(class))
194	(add-subclasses 'method 'standard-method)
195	(add-subclasses 'slot-definition
196	'(direct-slot-definition effective-slot-definition
197	standard-slot-definition))
198	(add-subclasses 'standard-slot-definition
199	'(standard-direct-slot-definition
200	standard-effective-slot-definition))
201	(add-subclasses 'direct-slot-definition 'standard-direct-slot-definition)
202	(add-subclasses 'effective-slot-definition
203	'standard-effective-slot-definition)
204	(add-subclasses 'class
205	'(built-in-class standard-class funcallable-standard-class))))
206	(fixup-standard-class-hierarchy)
207
208	(defun std-class-p (class)
209	(let ((metaclass (class-of class)))
210	(or (eq metaclass +the-standard-class+)
211	(eq metaclass +the-funcallable-standard-class+))))
212
213	(defun no-applicable-method (generic-function &rest args)
214	(error "There is no applicable method for the generic function ~S when called with arguments ~S."
215	generic-function
216	args))
217
218	(defun function-keywords (method)
219	(std-function-keywords method))
220
221	(declaim (notinline map-dependents))
222	(defun map-dependents (metaobject function)
223	;; stub, will be redefined later
224	(declare (ignore metaobject function))
225	nil)
226
227	(defmacro push-on-end (value location)
228	`(setf ,location (nconc ,location (list ,value))))
229
230	;;; (SETF GETF*) is like (SETF GETF) except that it always changes the list,
231	;;; which must be non-nil.
232
233	(defun (setf getf*) (new-value plist key)
234	(block body
235	(do ((x plist (cddr x)))
236	((null x))
237	(when (eq (car x) key)
238	(setf (car (cdr x)) new-value)
239	(return-from body new-value)))
240	(push-on-end key plist)
241	(push-on-end new-value plist)
242	new-value))
243
244	(defun mapappend (fun &rest args)
245	(if (some #'null args)
246	()
247	(append (apply fun (mapcar #'car args))
248	(apply #'mapappend fun (mapcar #'cdr args)))))
249
250	(defun mapplist (fun x)
251	(if (null x)
252	()
253	(cons (funcall fun (car x) (cadr x))
254	(mapplist fun (cddr x)))))
255
256	(defsetf std-slot-value set-std-slot-value)
257
258	(defsetf std-instance-layout %set-std-instance-layout)
259	(defsetf standard-instance-access %set-standard-instance-access)
260	(defun funcallable-standard-instance-access (instance location)
261	(standard-instance-access instance location))
262	(defsetf funcallable-standard-instance-access %set-standard-instance-access)
263
264	(defun (setf find-class) (new-value symbol &optional errorp environment)
265	(declare (ignore errorp environment))
266	(%set-find-class symbol new-value))
267
268	(defun canonicalize-direct-slots (direct-slots)
269	`(list ,@(mapcar #'canonicalize-direct-slot direct-slots)))
270
271	(defun canonicalize-direct-slot (spec)
272	(if (symbolp spec)
273	`(list :name ',spec)
274	(let ((name (car spec))
275	(initfunction nil)
276	(initform nil)
277	(initargs ())
278	(type nil)
279	(allocation nil)
280	(documentation nil)
281	(readers ())
282	(writers ())
283	(other-options ())
284	(non-std-options ()))
285	(do ((olist (cdr spec) (cddr olist)))
286	((null olist))
287	(case (car olist)
288	(:initform
289	(when initform
290	(error 'program-error
291	"duplicate slot option :INITFORM for slot named ~S"
292	name))
293	(setq initfunction t)
294	(setq initform (cadr olist)))
295	(:initarg
296	(push-on-end (cadr olist) initargs))
297	(:allocation
298	(when allocation
299	(error 'program-error
300	"duplicate slot option :ALLOCATION for slot named ~S"
301	name))
302	(setf allocation (cadr olist))
303	(push-on-end (car olist) other-options)
304	(push-on-end (cadr olist) other-options))
305	(:type
306	(when type
307	(error 'program-error
308	"duplicate slot option :TYPE for slot named ~S"
309	name))
310	(setf type (cadr olist)))
311	(:documentation
312	(when documentation
313	(error 'program-error
314	"duplicate slot option :DOCUMENTATION for slot named ~S"
315	name))
316	(setf documentation (cadr olist)))
317	(:reader
318	(maybe-note-name-defined (cadr olist))
319	(push-on-end (cadr olist) readers))
320	(:writer
321	(maybe-note-name-defined (cadr olist))
322	(push-on-end (cadr olist) writers))
323	(:accessor
324	(maybe-note-name-defined (cadr olist))
325	(push-on-end (cadr olist) readers)
326	(push-on-end `(setf ,(cadr olist)) writers))
327	(t
328	(push-on-end (cadr olist) (getf non-std-options (car olist))))))
329	`(list
330	:name ',name
331	,@(when initfunction
332	`(:initform ',initform
333	:initfunction ,(if (eq allocation :class)
334	;; CLHS specifies the initform for a
335	;; class allocation level slot needs
336	;; to be evaluated in the dynamic
337	;; extent of the DEFCLASS form
338	(let ((var (gensym)))
339	`(let ((,var ,initform))
340	(lambda () ,var)))
341	`(lambda () ,initform))))
342	,@(when initargs `(:initargs ',initargs))
343	,@(when readers `(:readers ',readers))
344	,@(when writers `(:writers ',writers))
345	,@(when type `(:type ',type))
346	,@(when documentation `(:documentation ',documentation))
347	,@other-options
348	,@(mapcar #'(lambda (opt) (if (or (atom opt) (/= 1 (length opt)))
349	`',opt
350	`',(car opt)))
351	non-std-options)))))
352
353	(defun maybe-note-name-defined (name)
354	(when (fboundp 'note-name-defined)
355	(note-name-defined name)))
356
357	(defun canonicalize-defclass-options (options)
358	(mapappend #'canonicalize-defclass-option options))
359
360	(defun canonicalize-defclass-option (option)
361	(case (car option)
362	(:metaclass
363	(list ':metaclass
364	`(find-class ',(cadr option))))
365	(:default-initargs
366	(list
367	':direct-default-initargs
368	`(list ,@(mapplist
369	#'(lambda (key value)
370	`(list ',key ',value ,(make-initfunction value)))
371	(cdr option)))))
372	((:documentation :report)
373	(list (car option) `',(cadr option)))
374	(t (list `(quote ,(car option)) `(quote ,(cdr option))))))
375
376	(defun make-initfunction (initform)
377	`(function (lambda () ,initform)))
378
379	(defun slot-definition-allocation (slot-definition)
380	(std-slot-value slot-definition 'sys::allocation))
381
382	(declaim (notinline (setf slot-definition-allocation)))
383	(defun (setf slot-definition-allocation) (value slot-definition)
384	(setf (std-slot-value slot-definition 'sys::allocation) value))
385
386	(defun slot-definition-initargs (slot-definition)
387	(std-slot-value slot-definition 'sys::initargs))
388
389	(declaim (notinline (setf slot-definition-initargs)))
390	(defun (setf slot-definition-initargs) (value slot-definition)
391	(setf (std-slot-value slot-definition 'sys::initargs) value))
392
393	(defun slot-definition-initform (slot-definition)
394	(std-slot-value slot-definition 'sys::initform))
395
396	(declaim (notinline (setf slot-definition-initform)))
397	(defun (setf slot-definition-initform) (value slot-definition)
398	(setf (std-slot-value slot-definition 'sys::initform) value))
399
400	(defun slot-definition-initfunction (slot-definition)
401	(std-slot-value slot-definition 'sys::initfunction))
402
403	(declaim (notinline (setf slot-definition-initfunction)))
404	(defun (setf slot-definition-initfunction) (value slot-definition)
405	(setf (std-slot-value slot-definition 'sys::initfunction) value))
406
407	(defun slot-definition-name (slot-definition)
408	(std-slot-value slot-definition 'sys:name))
409
410	(declaim (notinline (setf slot-definition-name)))
411	(defun (setf slot-definition-name) (value slot-definition)
412	(setf (std-slot-value slot-definition 'sys:name) value))
413
414	(defun slot-definition-readers (slot-definition)
415	(std-slot-value slot-definition 'sys::readers))
416
417	(declaim (notinline (setf slot-definition-readers)))
418	(defun (setf slot-definition-readers) (value slot-definition)
419	(setf (std-slot-value slot-definition 'sys::readers) value))
420
421	(defun slot-definition-writers (slot-definition)
422	(std-slot-value slot-definition 'sys::writers))
423
424	(declaim (notinline (setf slot-definition-writers)))
425	(defun (setf slot-definition-writers) (value slot-definition)
426	(setf (std-slot-value slot-definition 'sys::writers) value))
427
428	(defun slot-definition-allocation-class (slot-definition)
429	(std-slot-value slot-definition 'sys::allocation-class))
430
431	(declaim (notinline (setf slot-definition-allocation-class)))
432	(defun (setf slot-definition-allocation-class) (value slot-definition)
433	(setf (std-slot-value slot-definition 'sys::allocation-class) value))
434
435	(defun slot-definition-location (slot-definition)
436	(std-slot-value slot-definition 'sys::location))
437
438	(declaim (notinline (setf slot-definition-location-class)))
439	(defun (setf slot-definition-location) (value slot-definition)
440	(setf (std-slot-value slot-definition 'sys::location) value))
441
442	(defun slot-definition-type (slot-definition)
443	(std-slot-value slot-definition 'sys::%type))
444
445	(declaim (notinline (setf slot-definition-type)))
446	(defun (setf slot-definition-type) (value slot-definition)
447	(setf (std-slot-value slot-definition 'sys::%type) value))
448
449	(defun slot-definition-documentation (slot-definition)
450	(std-slot-value slot-definition 'sys:%documentation))
451
452	(declaim (notinline (setf slot-definition-documentation)))
453	(defun (setf slot-definition-documentation) (value slot-definition)
454	(setf (std-slot-value slot-definition 'sys:%documentation) value))
455
456	(defun init-slot-definition (slot &key name
457	(initargs ())
458	(initform nil)
459	(initfunction nil)
460	(readers ())
461	(writers ())
462	(allocation :instance)
463	(allocation-class nil)
464	(type t)
465	(documentation nil))
466	(setf (slot-definition-name slot) name)
467	(setf (slot-definition-initargs slot) initargs)
468	(setf (slot-definition-initform slot) initform)
469	(setf (slot-definition-initfunction slot) initfunction)
470	(setf (slot-definition-readers slot) readers)
471	(setf (slot-definition-writers slot) writers)
472	(setf (slot-definition-allocation slot) allocation)
473	(setf (slot-definition-allocation-class slot) allocation-class)
474	(setf (slot-definition-type slot) type)
475	(setf (slot-definition-documentation slot) documentation)
476	slot)
477
478	(declaim (notinline direct-slot-definition-class))
479	(defun direct-slot-definition-class (class &rest args)
480	(declare (ignore class args))
481	+the-standard-direct-slot-definition-class+)
482
483	(defun make-direct-slot-definition (class &rest args)
484	(let ((slot-class (apply #'direct-slot-definition-class class args)))
485	(if (eq slot-class +the-standard-direct-slot-definition-class+)
486	(let ((slot (%make-slot-definition +the-standard-direct-slot-definition-class+)))
487	(apply #'init-slot-definition slot :allocation-class class args)
488	slot)
489	(progn
490	(let ((slot (apply #'make-instance slot-class :allocation-class class
491	args)))
492	slot)))))
493
494	(declaim (notinline effective-slot-definition-class))
495	(defun effective-slot-definition-class (class &rest args)
496	(declare (ignore class args))
497	+the-standard-effective-slot-definition-class+)
498
499	(defun make-effective-slot-definition (class &rest args)
500	(let ((slot-class (apply #'effective-slot-definition-class class args)))
501	(if (eq slot-class +the-standard-effective-slot-definition-class+)
502	(let ((slot (%make-slot-definition +the-standard-effective-slot-definition-class+)))
503	(apply #'init-slot-definition slot args)
504	slot)
505	(progn
506	(let ((slot (apply #'make-instance slot-class args)))
507	slot)))))
508
509	;;; finalize-inheritance
510
511	(declaim (notinline compute-default-initargs))
512	(defun compute-default-initargs (class)
513	(std-compute-default-initargs class))
514
515	(defun std-compute-default-initargs (class)
516	(delete-duplicates
517	(mapcan #'(lambda (c)
518	(copy-list
519	(class-direct-default-initargs c)))
520	(class-precedence-list class))
521	:key #'car :from-end t))
522
523	(defun std-finalize-inheritance (class)
524	;; In case the class is already finalized, return
525	;; immediately, as per AMOP.
526	(when (class-finalized-p class)
527	(return-from std-finalize-inheritance))
528	(setf (class-precedence-list class)
529	(funcall (if (std-class-p class)
530	#'std-compute-class-precedence-list
531	#'compute-class-precedence-list)
532	class))
533	(setf (class-slots class)
534	(funcall (if (std-class-p class)
535	#'std-compute-slots
536	#'compute-slots) class))
537	(let ((old-layout (class-layout class))
538	(length 0)
539	(instance-slots '())
540	(shared-slots '()))
541	(dolist (slot (class-slots class))
542	(case (slot-definition-allocation slot)
543	(:instance
544	(setf (slot-definition-location slot) length)
545	(incf length)
546	(push (slot-definition-name slot) instance-slots))
547	(:class
548	(unless (slot-definition-location slot)
549	(let ((allocation-class (slot-definition-allocation-class slot)))
550	(if (eq allocation-class class)
551	;; We initialize class slots here so they can be
552	;; accessed without creating a dummy instance.
553	(let ((initfunction (slot-definition-initfunction slot)))
554	(setf (slot-definition-location slot)
555	(cons (slot-definition-name slot)
556	(if initfunction
557	(funcall initfunction)
558	+slot-unbound+))))
559	(setf (slot-definition-location slot)
560	(slot-location allocation-class (slot-definition-name slot))))))
561	(push (slot-definition-location slot) shared-slots))))
562	(when old-layout
563	;; Redefined class: initialize added shared slots.
564	(dolist (location shared-slots)
565	(let* ((slot-name (car location))
566	(old-location (layout-slot-location old-layout slot-name)))
567	(unless old-location
568	(let* ((slot-definition (find slot-name (class-slots class) :key 'slot-definition-name))
569	(initfunction (slot-definition-initfunction slot-definition)))
570	(when initfunction
571	(setf (cdr location) (funcall initfunction))))))))
572	(setf (class-layout class)
573	(make-layout class (nreverse instance-slots) (nreverse shared-slots))))
574	(setf (class-default-initargs class)
575	(compute-default-initargs class))
576	(setf (class-finalized-p class) t))
577
578	(declaim (notinline finalize-inheritance))
579	(defun finalize-inheritance (class)
580	(std-finalize-inheritance class))
581
582
583	;;; Class precedence lists
584
585	(defun std-compute-class-precedence-list (class)
586	(let ((classes-to-order (collect-superclasses* class)))
587	(dolist (super classes-to-order)
588	(when (typep super 'forward-referenced-class)
589	(error "Can't compute class precedence list for class ~A ~
590	which depends on forward referenced class ~A." class super)))
591	(topological-sort classes-to-order
592	(remove-duplicates
593	(mapappend #'local-precedence-ordering
594	classes-to-order))
595	#'std-tie-breaker-rule)))
596
597	;;; topological-sort implements the standard algorithm for topologically
598	;;; sorting an arbitrary set of elements while honoring the precedence
599	;;; constraints given by a set of (X,Y) pairs that indicate that element
600	;;; X must precede element Y. The tie-breaker procedure is called when it
601	;;; is necessary to choose from multiple minimal elements; both a list of
602	;;; candidates and the ordering so far are provided as arguments.
603
604	(defun topological-sort (elements constraints tie-breaker)
605	(let ((remaining-constraints constraints)
606	(remaining-elements elements)
607	(result ()))
608	(loop
609	(let ((minimal-elements
610	(remove-if
611	#'(lambda (class)
612	(member class remaining-constraints
613	:key #'cadr))
614	remaining-elements)))
615	(when (null minimal-elements)
616	(if (null remaining-elements)
617	(return-from topological-sort result)
618	(error "Inconsistent precedence graph.")))
619	(let ((choice (if (null (cdr minimal-elements))
620	(car minimal-elements)
621	(funcall tie-breaker
622	minimal-elements
623	result))))
624	(setq result (append result (list choice)))
625	(setq remaining-elements
626	(remove choice remaining-elements))
627	(setq remaining-constraints
628	(remove choice
629	remaining-constraints
630	:test #'member)))))))
631
632	;;; In the event of a tie while topologically sorting class precedence lists,
633	;;; the CLOS Specification says to "select the one that has a direct subclass
634	;;; rightmost in the class precedence list computed so far." The same result
635	;;; is obtained by inspecting the partially constructed class precedence list
636	;;; from right to left, looking for the first minimal element to show up among
637	;;; the direct superclasses of the class precedence list constituent.
638	;;; (There's a lemma that shows that this rule yields a unique result.)
639
640	(defun std-tie-breaker-rule (minimal-elements cpl-so-far)
641	(dolist (cpl-constituent (reverse cpl-so-far))
642	(let* ((supers (class-direct-superclasses cpl-constituent))
643	(common (intersection minimal-elements supers)))
644	(when (not (null common))
645	(return-from std-tie-breaker-rule (car common))))))
646
647	;;; This version of collect-superclasses* isn't bothered by cycles in the class
648	;;; hierarchy, which sometimes happen by accident.
649
650	(defun collect-superclasses* (class)
651	(labels ((all-superclasses-loop (seen superclasses)
652	(let ((to-be-processed
653	(set-difference superclasses seen)))
654	(if (null to-be-processed)
655	superclasses
656	(let ((class-to-process
657	(car to-be-processed)))
658	(all-superclasses-loop
659	(cons class-to-process seen)
660	(union (class-direct-superclasses
661	class-to-process)
662	superclasses)))))))
663	(all-superclasses-loop () (list class))))
664
665	;;; The local precedence ordering of a class C with direct superclasses C_1,
666	;;; C_2, ..., C_n is the set ((C C_1) (C_1 C_2) ...(C_n-1 C_n)).
667
668	(defun local-precedence-ordering (class)
669	(mapcar #'list
670	(cons class
671	(butlast (class-direct-superclasses class)))
672	(class-direct-superclasses class)))
673
674	;;; Slot inheritance
675
676	(defun std-compute-slots (class)
677	(let* ((all-slots (mapappend #'(lambda (c) (class-direct-slots c))
678	;; Slots of base class must come first
679	(reverse (class-precedence-list class))))
680	(all-names (delete-duplicates
681	(mapcar 'slot-definition-name all-slots)
682	:from-end t)))
683	(mapcar #'(lambda (name)
684	(funcall
685	(if (std-class-p class)
686	#'std-compute-effective-slot-definition
687	#'compute-effective-slot-definition)
688	class
689	name
690	;; Slot of inherited class must override initfunction,
691	;; documentation of base class
692	(nreverse
693	(remove name all-slots
694	:key 'slot-definition-name
695	:test-not #'eq))))
696	all-names)))
697
698	(defun std-compute-effective-slot-definition (class name direct-slots)
699	(let ((initer (find-if-not #'null direct-slots
700	:key 'slot-definition-initfunction))
701	(documentation-slot (find-if-not #'null direct-slots
702	:key 'slot-definition-documentation))
703	(types (delete-duplicates
704	(delete t (mapcar #'slot-definition-type direct-slots))
705	:test #'equal)))
706	(make-effective-slot-definition
707	class
708	:name name
709	:initform (if initer
710	(slot-definition-initform initer)
711	nil)
712	:initfunction (if initer
713	(slot-definition-initfunction initer)
714	nil)
715	:initargs (remove-duplicates
716	(mapappend 'slot-definition-initargs
717	direct-slots))
718	:allocation (slot-definition-allocation (car direct-slots))
719	:allocation-class (when (slot-boundp (car direct-slots)
720	'sys::allocation-class)
721	;;for some classes created in Java
722	;;(e.g. SimpleCondition) this slot is unbound
723	(slot-definition-allocation-class (car direct-slots)))
724	:type (cond ((null types) t)
725	((= 1 (length types)) types)
726	(t (list* 'and types)))
727	:documentation (if documentation-slot
728	(documentation documentation-slot t)
729	nil))))
730
731	;;; Standard instance slot access
732
733	;;; N.B. The location of the effective-slots slots in the class metaobject for
734	;;; standard-class must be determined without making any further slot
735	;;; references.
736
737	(defun find-slot-definition (class slot-name)
738	(dolist (slot (class-slots class) nil)
739	(when (eq slot-name (slot-definition-name slot))
740	(return slot))))
741
742	(defun slot-location (class slot-name)
743	(let ((slot (find-slot-definition class slot-name)))
744	(if slot
745	(slot-definition-location slot)
746	nil)))
747
748	(defun instance-slot-location (instance slot-name)
749	(let ((layout (std-instance-layout instance)))
750	(and layout (layout-slot-location layout slot-name))))
751
752	(defun slot-value (object slot-name)
753	(let* ((class (class-of object))
754	(metaclass (class-of class)))
755	(if (or (eq metaclass +the-standard-class+)
756	(eq metaclass +the-structure-class+)
757	(eq metaclass +the-funcallable-standard-class+))
758	(std-slot-value object slot-name)
759	(slot-value-using-class class object
760	(find-slot-definition class slot-name)))))
761
762	(defun %set-slot-value (object slot-name new-value)
763	(let* ((class (class-of object))
764	(metaclass (class-of class)))
765	(if (or (eq metaclass +the-standard-class+)
766	(eq metaclass +the-structure-class+)
767	(eq metaclass +the-funcallable-standard-class+))
768	(setf (std-slot-value object slot-name) new-value)
769	(setf (slot-value-using-class class object
770	(find-slot-definition class slot-name))
771	new-value))))
772
773	(defsetf slot-value %set-slot-value)
774
775	(defun slot-boundp (object slot-name)
776	(let ((class (class-of object)))
777	(if (std-class-p class)
778	(std-slot-boundp object slot-name)
779	(slot-boundp-using-class class object
780	(find-slot-definition class slot-name)))))
781
782	(defun std-slot-makunbound (instance slot-name)
783	(let ((location (instance-slot-location instance slot-name)))
784	(cond ((fixnump location)
785	(setf (standard-instance-access instance location) +slot-unbound+))
786	((consp location)
787	(setf (cdr location) +slot-unbound+))
788	(t
789	(slot-missing (class-of instance) instance slot-name 'slot-makunbound))))
790	instance)
791
792	(defun slot-makunbound (object slot-name)
793	(let ((class (class-of object)))
794	(if (std-class-p class)
795	(std-slot-makunbound object slot-name)
796	(slot-makunbound-using-class class object
797	(find-slot-definition class slot-name)))))
798
799	(defun std-slot-exists-p (instance slot-name)
800	(not (null (find slot-name (class-slots (class-of instance))
801	:key 'slot-definition-name))))
802
803	(defun slot-exists-p (object slot-name)
804	(let ((class (class-of object)))
805	(if (std-class-p class)
806	(std-slot-exists-p object slot-name)
807	(slot-exists-p-using-class class object slot-name))))
808
809	(defun instance-slot-p (slot)
810	(eq (slot-definition-allocation slot) :instance))
811
812	(defun std-allocate-instance (class)
813	(sys::%std-allocate-instance class))
814
815	(defun allocate-funcallable-instance (class)
816	(let ((instance (sys::%allocate-funcallable-instance class)))
817	;; KLUDGE: without this, the build fails with unbound-slot
818	(when (or (eq class +the-standard-generic-function-class+)
819	(subtypep class +the-standard-generic-function-class+))
820	(setf (std-slot-value instance 'sys::method-class)
821	+the-standard-method-class+))
822	(set-funcallable-instance-function
823	instance
824	#'(lambda (&rest args)
825	(declare (ignore args))
826	(error 'program-error "Called a funcallable-instance with unset function.")))
827	instance))
828
829	(declaim (notinline class-prototype))
830	(defun class-prototype (class)
831	(unless (class-finalized-p class) (error "Class ~A not finalized" (class-name class)))
832	(std-allocate-instance class))
833
834	(defun maybe-finalize-class-subtree (class)
835	(when (every #'class-finalized-p (class-direct-superclasses class))
836	(finalize-inheritance class)
837	(dolist (subclass (class-direct-subclasses class))
838	(maybe-finalize-class-subtree subclass))))
839
840	(defun make-instance-standard-class (metaclass
841	&rest initargs
842	&key name direct-superclasses direct-slots
843	direct-default-initargs
844	documentation)
845	(declare (ignore metaclass))
846	(let ((class (std-allocate-instance +the-standard-class+)))
847	(unless clos-booting
848	(check-initargs (list #'allocate-instance #'initialize-instance)
849	(list* class initargs)
850	class t initargs
851	make-instance-initargs-cache 'make-instance))
852	(%set-class-name name class)
853	;; KLUDGE: necessary in define-primordial-class, otherwise
854	;; StandardClass.getClassLayout() throws an error
855	(unless clos-booting (%set-class-layout nil class))
856	(%set-class-direct-subclasses () class)
857	(%set-class-direct-methods () class)
858	(%set-class-documentation class documentation)
859	(std-after-initialization-for-classes class
860	:direct-superclasses direct-superclasses
861	:direct-slots direct-slots
862	:direct-default-initargs direct-default-initargs)
863	class))
864
865	(defun make-or-find-instance-funcallable-standard-class
866	(metaclass &rest initargs &key name direct-superclasses direct-slots
867	direct-default-initargs documentation)
868	(declare (ignore metaclass initargs))
869	(or (find-class name nil)
870	(let ((class (std-allocate-instance +the-funcallable-standard-class+)))
871	(%set-class-name name class)
872	(unless clos-booting (%set-class-layout nil class))
873	(%set-class-direct-subclasses () class)
874	(%set-class-direct-methods () class)
875	(%set-class-documentation class documentation)
876	(std-after-initialization-for-classes class
877	:direct-superclasses direct-superclasses
878	:direct-slots direct-slots
879	:direct-default-initargs direct-default-initargs)
880	class)))
881
882	;(defun convert-to-direct-slot-definition (class canonicalized-slot)
883	; (apply #'make-instance
884	; (apply #'direct-slot-definition-class
885	; class canonicalized-slot)
886	; canonicalized-slot))
887
888	(defun canonicalize-direct-superclass-list (class direct-superclasses)
889	(cond (direct-superclasses)
890	((subtypep (class-of class) +the-funcallable-standard-class+)
891	(list +the-funcallable-standard-object-class+))
892	((subtypep (class-of class) +the-standard-class+)
893	(list +the-standard-object-class+))))
894
895	(defun std-after-initialization-for-classes (class
896	&key direct-superclasses direct-slots
897	direct-default-initargs
898	&allow-other-keys)
899	(let ((supers (canonicalize-direct-superclass-list class direct-superclasses)))
900	(setf (class-direct-superclasses class) supers)
901	(dolist (superclass supers)
902	(add-direct-subclass superclass class)))
903	(let ((slots (mapcar #'(lambda (slot-properties)
904	(apply #'make-direct-slot-definition class slot-properties))
905	direct-slots)))
906	(setf (class-direct-slots class) slots)
907	(dolist (direct-slot slots)
908	(dolist (reader (slot-definition-readers direct-slot))
909	(add-reader-method class reader direct-slot))
910	(dolist (writer (slot-definition-writers direct-slot))
911	(add-writer-method class writer direct-slot))))
912	(setf (class-direct-default-initargs class) direct-default-initargs)
913	(maybe-finalize-class-subtree class)
914	(values))
915
916	(defmacro define-primordial-class (name superclasses direct-slots)
917	"Primitive class definition tool.
918	No non-standard metaclasses, accessor methods, duplicate slots,
919	non-existent superclasses, default initargs, or other complicated stuff.
920	Handle with care."
921	(let ((class (gensym)))
922	`(let ((,class (make-instance-standard-class
923	nil
924	:name ',name
925	:direct-superclasses ',(mapcar #'find-class superclasses)
926	:direct-slots ,(canonicalize-direct-slots direct-slots))))
927	(%set-find-class ',name ,class)
928	,class)))
929
930	(defmacro define-funcallable-primordial-class (name superclasses direct-slots)
931	"Primitive funcallable class definition tool.
932	No non-standard metaclasses, accessor methods, duplicate slots,
933	non-existent superclasses, default initargs, or other complicated stuff.
934	Handle with care.
935	Will not modify existing classes to avoid breaking std-generic-function-p."
936	(let ((class (gensym)))
937	`(let ((,class (make-or-find-instance-funcallable-standard-class
938	nil
939	:name ',name
940	:direct-superclasses ',(mapcar #'find-class superclasses)
941	:direct-slots ,(canonicalize-direct-slots direct-slots))))
942	(%set-find-class ',name ,class)
943	,class)))
944
945	(define-primordial-class eql-specializer (specializer)
946	((object :initform nil)
947	(direct-methods :initform nil)))
948
949	(define-primordial-class method-combination (metaobject)
950	((sys::name :initarg :name :initform nil)
951	(sys::%documentation :initarg :documentation :initform nil)
952	(options :initarg :options :initform nil)))
953
954	(define-primordial-class short-method-combination (method-combination)
955	((operator :initarg :operator)
956	(identity-with-one-argument :initarg :identity-with-one-argument)))
957
958	(define-primordial-class long-method-combination (method-combination)
959	((sys::lambda-list :initarg :lambda-list)
960	(method-group-specs :initarg :method-group-specs)
961	(args-lambda-list :initarg :args-lambda-list)
962	(generic-function-symbol :initarg :generic-function-symbol)
963	(function :initarg :function)
964	(arguments :initarg :arguments)
965	(declarations :initarg :declarations)
966	(forms :initarg :forms)))
967
968	(define-primordial-class standard-accessor-method (standard-method)
969	((sys::%slot-definition :initarg :slot-definition :initform nil)))
970
971	(define-primordial-class standard-reader-method (standard-accessor-method)
972	())
973	(defconstant +the-standard-reader-method-class+
974	(find-class 'standard-reader-method))
975
976	(define-primordial-class standard-writer-method (standard-accessor-method)
977	())
978	(defconstant +the-standard-writer-method-class+
979	(find-class 'standard-writer-method))
980
981	(define-primordial-class structure-class (class)
982	())
983	(defconstant +the-structure-class+ (find-class 'structure-class))
984
985	(define-primordial-class forward-referenced-class (class)
986	;; The standard-class layout. Not all of these slots are necessary,
987	;; but at least NAME and DIRECT-SUBCLASSES are.
988	((sys::name :initarg :name :initform nil)
989	(sys::layout :initform nil)
990	(sys::direct-superclasses :initform nil)
991	(sys::direct-subclasses :initform nil)
992	(sys::precedence-list :initform nil)
993	(sys::direct-methods :initform nil)
994	(sys::direct-slots :initform nil)
995	(sys::slots :initform nil)
996	(sys::direct-default-initargs :initform nil)
997	(sys::default-initargs :initform nil)
998	(sys::finalized-p :initform nil)
999	(sys::%documentation :initform nil)))
1000	(defconstant +the-forward-referenced-class+
1001	(find-class 'forward-referenced-class))
1002
1003	(define-funcallable-primordial-class generic-function
1004	(metaobject funcallable-standard-object)
1005	())
1006
1007	(defvar extensible-built-in-classes
1008	(list (find-class 'sequence)
1009	(find-class 'java:java-object)))
1010
1011	(defvar make-instance-initargs-cache
1012	(make-hash-table :test #'eq)
1013	"Cached sets of allowable initargs, keyed on the class they belong to.")
1014	(defvar reinitialize-instance-initargs-cache
1015	(make-hash-table :test #'eq)
1016	"Cached sets of allowable initargs, keyed on the class they belong to.")
1017
1018	(defun expand-long-defcombin (name args)
1019	(destructuring-bind (lambda-list method-groups &rest body) args
1020	`(apply #'define-long-form-method-combination
1021	',name
1022	',lambda-list
1023	(list ,@(mapcar #'canonicalize-method-group-spec method-groups))
1024	',body)))
1025
1026	;;; The class method-combination and its subclasses are defined in
1027	;;; StandardClass.java, but we cannot use make-instance and slot-value
1028	;;; yet.
1029
1030	(defun %make-long-method-combination (&key name documentation lambda-list
1031	method-group-specs args-lambda-list
1032	generic-function-symbol function
1033	arguments declarations forms)
1034	(let ((instance (std-allocate-instance (find-class 'long-method-combination))))
1035	(setf (std-slot-value instance 'sys::name) name)
1036	(setf (std-slot-value instance 'sys:%documentation) documentation)
1037	(setf (std-slot-value instance 'sys::lambda-list) lambda-list)
1038	(setf (std-slot-value instance 'method-group-specs) method-group-specs)
1039	(setf (std-slot-value instance 'args-lambda-list) args-lambda-list)
1040	(setf (std-slot-value instance 'generic-function-symbol)
1041	generic-function-symbol)
1042	(setf (std-slot-value instance 'function) function)
1043	(setf (std-slot-value instance 'arguments) arguments)
1044	(setf (std-slot-value instance 'declarations) declarations)
1045	(setf (std-slot-value instance 'forms) forms)
1046	(setf (std-slot-value instance 'options) nil)
1047	instance))
1048
1049	(defun method-combination-name (method-combination)
1050	(check-type method-combination method-combination)
1051	(std-slot-value method-combination 'sys::name))
1052
1053	(defun method-combination-documentation (method-combination)
1054	(check-type method-combination method-combination)
1055	(std-slot-value method-combination 'sys:%documentation))
1056
1057	(defun short-method-combination-operator (method-combination)
1058	(check-type method-combination short-method-combination)
1059	(std-slot-value method-combination 'operator))
1060
1061	(defun short-method-combination-identity-with-one-argument (method-combination)
1062	(check-type method-combination short-method-combination)
1063	(std-slot-value method-combination 'identity-with-one-argument))
1064
1065	(defun long-method-combination-lambda-list (method-combination)
1066	(check-type method-combination long-method-combination)
1067	(std-slot-value method-combination 'sys::lambda-list))
1068
1069	(defun long-method-combination-method-group-specs (method-combination)
1070	(check-type method-combination long-method-combination)
1071	(std-slot-value method-combination 'method-group-specs))
1072
1073	(defun long-method-combination-args-lambda-list (method-combination)
1074	(check-type method-combination long-method-combination)
1075	(std-slot-value method-combination 'args-lambda-list))
1076
1077	(defun long-method-combination-generic-function-symbol (method-combination)
1078	(check-type method-combination long-method-combination)
1079	(std-slot-value method-combination 'generic-function-symbol))
1080
1081	(defun long-method-combination-function (method-combination)
1082	(check-type method-combination long-method-combination)
1083	(std-slot-value method-combination 'function))
1084
1085	(defun long-method-combination-arguments (method-combination)
1086	(check-type method-combination long-method-combination)
1087	(std-slot-value method-combination 'arguments))
1088
1089	(defun long-method-combination-declarations (method-combination)
1090	(check-type method-combination long-method-combination)
1091	(std-slot-value method-combination 'declarations))
1092
1093	(defun long-method-combination-forms (method-combination)
1094	(check-type method-combination long-method-combination)
1095	(std-slot-value method-combination 'forms))
1096
1097
1098	(defun expand-short-defcombin (whole)
1099	(let* ((name (cadr whole))
1100	(documentation
1101	(getf (cddr whole) :documentation ""))
1102	(identity-with-one-arg
1103	(getf (cddr whole) :identity-with-one-argument nil))
1104	(operator
1105	(getf (cddr whole) :operator name)))
1106	`(progn
1107	(let ((instance (std-allocate-instance
1108	(find-class 'short-method-combination))))
1109	(setf (std-slot-value instance 'sys::name) ',name)
1110	(setf (std-slot-value instance 'sys:%documentation) ',documentation)
1111	(setf (std-slot-value instance 'operator) ',operator)
1112	(setf (std-slot-value instance 'identity-with-one-argument)
1113	',identity-with-one-arg)
1114	(setf (std-slot-value instance 'options) nil)
1115	(setf (get ',name 'method-combination-object) instance)
1116	',name))))
1117
1118	(defmacro define-method-combination (&whole form name &rest args)
1119	(if (and (cddr form)
1120	(listp (caddr form)))
1121	(expand-long-defcombin name args)
1122	(expand-short-defcombin form)))
1123
1124	(define-method-combination + :identity-with-one-argument t)
1125	(define-method-combination and :identity-with-one-argument t)
1126	(define-method-combination append :identity-with-one-argument nil)
1127	(define-method-combination list :identity-with-one-argument nil)
1128	(define-method-combination max :identity-with-one-argument t)
1129	(define-method-combination min :identity-with-one-argument t)
1130	(define-method-combination nconc :identity-with-one-argument t)
1131	(define-method-combination or :identity-with-one-argument t)
1132	(define-method-combination progn :identity-with-one-argument t)
1133
1134	;;;
1135	;;; long form of define-method-combination (from Sacla and XCL)
1136	;;;
1137	(defun method-group-p (selecter qualifiers)
1138	;; selecter::= qualifier-pattern \| predicate
1139	(etypecase selecter
1140	(list (or (equal selecter qualifiers)
1141	(let ((last (last selecter)))
1142	(when (eq '* (cdr last))
1143	(let* ((prefix `(,@(butlast selecter) ,(car last)))
1144	(pos (mismatch prefix qualifiers)))
1145	(or (null pos) (= pos (length prefix))))))))
1146	((eql *) t)
1147	(symbol (funcall (symbol-function selecter) qualifiers))))
1148
1149	(defun check-variable-name (name)
1150	(flet ((valid-variable-name-p (name)
1151	(and (symbolp name) (not (constantp name)))))
1152	(assert (valid-variable-name-p name))))
1153
1154	(defun canonicalize-method-group-spec (spec)
1155	;; spec ::= (name {qualifier-pattern+ \| predicate} [[long-form-option]])
1156	;; long-form-option::= :description description \| :order order \|
1157	;; :required required-p
1158	;; a canonicalized-spec is a simple plist.
1159	(let* ((rest spec)
1160	(name (prog2 (check-variable-name (car rest))
1161	(car rest)
1162	(setq rest (cdr rest))))
1163	(option-names '(:description :order :required))
1164	(selecters (let ((end (or (position-if #'(lambda (it)
1165	(member it option-names))
1166	rest)
1167	(length rest))))
1168	(prog1 (subseq rest 0 end)
1169	(setq rest (subseq rest end)))))
1170	(description (getf rest :description ""))
1171	(order (getf rest :order :most-specific-first))
1172	(required-p (getf rest :required)))
1173	`(list :name ',name
1174	:predicate (lambda (qualifiers)
1175	(loop for item in ',selecters
1176	thereis (method-group-p item qualifiers)))
1177	:description ',description
1178	:order ',order
1179	:required ',required-p
1180	:-selecter ,(equal selecters '()))))
1181
1182	(defun extract-required-part (lambda-list)
1183	(flet ((skip (key lambda-list)
1184	(if (eq (first lambda-list) key)
1185	(cddr lambda-list)
1186	lambda-list)))
1187	(let* ((trimmed-lambda-list
1188	(skip '&environment (skip '&whole lambda-list)))
1189	(after-required-lambda-list
1190	(member-if #'(lambda (it) (member it lambda-list-keywords))
1191	trimmed-lambda-list)))
1192	(if after-required-lambda-list
1193	(ldiff trimmed-lambda-list after-required-lambda-list)
1194	trimmed-lambda-list))))
1195
1196	(defun extract-specified-part (key lambda-list)
1197	(case key
1198	((&eval &whole)
1199	(list (second (member key lambda-list))))
1200	(t
1201	(let ((here (cdr (member key lambda-list))))
1202	(ldiff here
1203	(member-if #'(lambda (it) (member it lambda-list-keywords))
1204	here))))))
1205
1206	(defun extract-optional-part (lambda-list)
1207	(extract-specified-part '&optional lambda-list))
1208
1209	(defun parse-define-method-combination-args-lambda-list (lambda-list)
1210	;; Define-method-combination Arguments Lambda Lists
1211	;; http://www.lispworks.com/reference/HyperSpec/Body/03_dj.htm
1212	(let ((required (extract-required-part lambda-list))
1213	(whole (extract-specified-part '&whole lambda-list))
1214	(optional (extract-specified-part '&optional lambda-list))
1215	(rest (extract-specified-part '&rest lambda-list))
1216	(keys (extract-specified-part '&key lambda-list))
1217	(aux (extract-specified-part '&aux lambda-list)))
1218	(values (first whole)
1219	required
1220	(mapcar #'(lambda (spec)
1221	(if (consp spec)
1222	`(,(first spec) ,(second spec) ,@(cddr spec))
1223	`(,spec nil)))
1224	optional)
1225	(first rest)
1226	(mapcar #'(lambda (spec)
1227	(let ((key (if (consp spec) (car spec) spec))
1228	(rest (when (consp spec) (rest spec))))
1229	`(,(if (consp key) key `(,(make-keyword key) ,key))
1230	,(car rest)
1231	,@(cdr rest))))
1232	keys)
1233	(mapcar #'(lambda (spec)
1234	(if (consp spec)
1235	`(,(first spec) ,(second spec))
1236	`(,spec nil)))
1237	aux))))
1238
1239	(defun wrap-with-call-method-macro (gf args-var emf-form)
1240	`(macrolet
1241	((call-method (method &optional next-method-list)
1242	`(funcall
1243	,(cond
1244	((listp method)
1245	(assert (eq (first method) 'make-method))
1246	;; by generating an inline expansion we prevent allocation
1247	;; of a method instance which will be discarded immediately
1248	;; after reading the METHOD-FUNCTION slot
1249	(compute-method-function
1250	`(lambda (&rest ,(gensym))
1251	;; the MAKE-METHOD body form gets evaluated in
1252	;; the null lexical environment augmented
1253	;; with a binding for CALL-METHOD
1254	,(wrap-with-call-method-macro ,gf
1255	',args-var
1256	(second method)))))
1257	(t (method-function method)))
1258	,',args-var
1259	,(unless (null next-method-list)
1260	;; by not generating an emf when there are no next methods,
1261	;; we ensure next-method-p returns NIL
1262	(compute-effective-method
1263	,gf (generic-function-method-combination ,gf)
1264	(process-next-method-list next-method-list))))))
1265	,emf-form))
1266
1267	(defun assert-unambiguous-method-sorting (group-name methods)
1268	(let ((specializers (make-hash-table :test 'equal)))
1269	(dolist (method methods)
1270	(push method (gethash (method-specializers method) specializers)))
1271	(loop for specializer-methods being each hash-value of specializers
1272	using (hash-key method-specializers)
1273	unless (= 1 (length specializer-methods))
1274	do (error "Ambiguous method sorting in method group ~A due to multiple ~
1275	methods with specializers ~S: ~S"
1276	group-name method-specializers specializer-methods))))
1277
1278	(defmacro with-method-groups (method-group-specs methods-form &body forms)
1279	(flet ((grouping-form (spec methods-var)
1280	(let ((predicate (coerce-to-function (getf spec :predicate)))
1281	(group (gensym))
1282	(leftovers (gensym))
1283	(method (gensym)))
1284	`(let ((,group '())
1285	(,leftovers '()))
1286	(dolist (,method ,methods-var)
1287	(if (funcall ,predicate (method-qualifiers ,method))
1288	(push ,method ,group)
1289	(push ,method ,leftovers)))
1290	(ecase ,(getf spec :order)
1291	(:most-specific-last )
1292	(:most-specific-first (setq ,group (nreverse ,group))))
1293	,@(when (getf spec :required)
1294	`((when (null ,group)
1295	(error "Method group ~S must not be empty."
1296	',(getf spec :name)))))
1297	(setq ,methods-var (nreverse ,leftovers))
1298	,group))))
1299	(let ((rest (gensym))
1300	(method (gensym)))
1301	`(let* ((,rest ,methods-form)
1302	,@(mapcar #'(lambda (spec)
1303	`(,(getf spec :name) ,(grouping-form spec rest)))
1304	method-group-specs))
1305	(dolist (,method ,rest)
1306	(invalid-method-error ,method
1307	"Method ~S with qualifiers ~S does not belong to any method group."
1308	,method (method-qualifiers ,method)))
1309	,@(unless (and (= 1 (length method-group-specs))
1310	(getf (car method-group-specs) :*-selecter))
1311	(mapcar #'(lambda (spec)
1312	`(assert-unambiguous-method-sorting ',(getf spec :name) ,(getf spec :name)))
1313	method-group-specs))
1314	,@forms))))
1315
1316	(defun method-combination-type-lambda-with-args-emf
1317	(&key args-lambda-list generic-function-symbol forms &allow-other-keys)
1318	(multiple-value-bind
1319	(whole required optional rest keys aux)
1320	(parse-define-method-combination-args-lambda-list args-lambda-list)
1321	(unless rest
1322	(when keys
1323	(setf rest (gensym))))
1324	(let* ((gf-lambda-list (gensym))
1325	(args-var (gensym))
1326	(args-len-var (gensym))
1327	(binding-forms (gensym))
1328	(needs-args-len-var (gensym))
1329	(emf-form (gensym)))
1330	`(let* ((,gf-lambda-list (slot-value ,generic-function-symbol
1331	'sys::lambda-list))
1332	(nreq (length (extract-required-part ,gf-lambda-list)))
1333	(nopt (length (extract-optional-part ,gf-lambda-list)))
1334	(,binding-forms)
1335	(,needs-args-len-var)
1336	(,emf-form
1337	(let* (,@(when whole
1338	`((,whole (progn
1339	(push `(,',whole ,',args-var)
1340	,binding-forms)
1341	',args-var))))
1342	,@(when rest
1343	;; ### TODO: use a fresh symbol for the rest
1344	;; binding being generated and pushed into binding-forms
1345	`((,rest (progn
1346	(push `(,',rest
1347	(subseq ,',args-var
1348	,(+ nreq nopt)))
1349	,binding-forms)
1350	',rest))))
1351	,@(loop for var in required and i upfrom 0
1352	for var-binding = (gensym)
1353	collect `(,var (when (< ,i nreq)
1354	(push `(,',var-binding
1355	(nth ,,i ,',args-var))
1356	,binding-forms)
1357	',var-binding)))
1358	,@(loop for (var initform supplied-var) in optional
1359	and i upfrom 0
1360	for supplied-binding = (or supplied-var (gensym))
1361	for var-binding = (gensym)
1362	;; check for excess parameters
1363	;; only assign initform if the parameter
1364	;; isn't in excess: the spec says explicitly
1365	;; to bind parameters in excess to forms evaluating
1366	;; to nil.
1367	;; This leaves initforms to be used with
1368	;; parameters not supplied in excess, but
1369	;; not available in the arguments list
1370	;;
1371	;; Also, if specified, bind "supplied-p"
1372	collect `(,supplied-binding
1373	(when (< ,i nopt)
1374	(setq ,needs-args-len-var t)
1375	;; ### TODO: use a fresh symbol for the supplied binding
1376	;; binding being generated and pushed into binding-forms
1377	(push `(,',supplied-binding
1378	(< ,(+ ,i nreq) ,',args-len-var))
1379	,binding-forms)
1380	',supplied-binding))
1381	collect `(,var (when (< ,i nopt)
1382	(push `(,',var-binding
1383	(if ,',supplied-binding
1384	(nth ,(+ ,i nreq)
1385	,',args-var)
1386	,',initform))
1387	,binding-forms)
1388	',var-binding)))
1389	,@(loop for ((key var) initform supplied-var) in keys
1390	for supplied-binding = (or supplied-var (gensym))
1391	for var-binding = (gensym)
1392	;; Same as optional parameters:
1393	;; even though keywords can't be supplied in
1394	;; excess, we should bind "supplied-p" in case
1395	;; the key isn't supplied in the arguments list
1396	collect `(,supplied-binding
1397	(progn
1398	;; ### TODO: use a fresh symbol for the rest
1399	;; binding being generated and pushed into binding-forms
1400	(push `(,',supplied-binding
1401	(member ,',key ,',rest))
1402	,binding-forms)
1403	',supplied-binding))
1404	collect `(,var (progn
1405	(push `(,',var-binding
1406	(if ,',supplied-binding
1407	(cadr ,',supplied-binding)
1408	,',initform))
1409	,binding-forms)
1410	',var-binding)))
1411	,@(loop for (var initform) in aux
1412	for var-binding = (gensym)
1413	collect `(,var (progn
1414	(push '(,var-binding ,initform)
1415	,binding-forms)
1416	',var-binding))))
1417	,@forms)))
1418	`(lambda (,',args-var)
1419	;; set up bindings to ensure the expressions to which the
1420	;; variables of the arguments option have been bound are
1421	;; evaluated exactly once.
1422	(let* (,@(when ,needs-args-len-var
1423	`((,',args-len-var (length ,',args-var))))
1424	,@(reverse ,binding-forms))
1425	;; This is the lambda which is the effective method
1426	;; hence gets called on every method invocation
1427	;; be as efficient in this method as we can be
1428	,(wrap-with-call-method-macro ,generic-function-symbol
1429	',args-var ,emf-form)))))))
1430
1431	(defun method-combination-type-lambda
1432	(&rest all-args
1433	&key name lambda-list args-lambda-list generic-function-symbol
1434	method-group-specs declarations forms &allow-other-keys)
1435	(declare (ignore name))
1436	(let ((methods (gensym))
1437	(args-var (gensym))
1438	(emf-form (gensym)))
1439	`(lambda (,generic-function-symbol ,methods ,@lambda-list)
1440	;; This is the lambda which computes the effective method
1441	,@declarations
1442	(with-method-groups ,method-group-specs
1443	,methods
1444	,(if (null args-lambda-list)
1445	`(let ((,emf-form (progn ,@forms)))
1446	`(lambda (,',args-var)
1447	;; This is the lambda which is the effective method
1448	;; hence gets called on every method invocation
1449	;; be as efficient in this method as we can be
1450	,(wrap-with-call-method-macro ,generic-function-symbol
1451	',args-var ,emf-form)))
1452	(apply #'method-combination-type-lambda-with-args-emf all-args))))))
1453
1454	(defun declarationp (expr)
1455	(and (consp expr) (eq (car expr) 'DECLARE)))
1456
1457	(defun long-form-method-combination-args (args)
1458	;; define-method-combination name lambda-list (method-group-specifier*) args
1459	;; args ::= [(:arguments . args-lambda-list)]
1460	;; [(:generic-function generic-function-symbol)]
1461	;; [[declaration* \| documentation]] form*
1462	(let ((rest args))
1463	(labels ((nextp (key) (and (consp (car rest)) (eq key (caar rest))))
1464	(args-lambda-list ()
1465	(when (nextp :arguments)
1466	(prog1 (cdr (car rest)) (setq rest (cdr rest)))))
1467	(generic-function-symbol ()
1468	(if (nextp :generic-function)
1469	(prog1 (second (car rest)) (setq rest (cdr rest)))
1470	(gensym)))
1471	(declaration* ()
1472	(let ((end (position-if-not #'declarationp rest)))
1473	(when end
1474	(prog1 (subseq rest 0 end) (setq rest (nthcdr end rest))))))
1475	(documentation? ()
1476	(when (stringp (car rest))
1477	(prog1 (car rest) (setq rest (cdr rest)))))
1478	(form* () rest))
1479	(let ((declarations '()))
1480	`(:args-lambda-list ,(args-lambda-list)
1481	:generic-function-symbol ,(generic-function-symbol)
1482	:documentation ,(prog2 (setq declarations (declaration*))
1483	(documentation?))
1484	:declarations (,@declarations ,@(declaration*))
1485	:forms ,(form*))))))
1486
1487	(defun define-long-form-method-combination (name lambda-list method-group-specs
1488	&rest args)
1489	(let* ((initargs `(:name ,name
1490	:lambda-list ,lambda-list
1491	:method-group-specs ,method-group-specs
1492	,@(long-form-method-combination-args args)))
1493	(lambda-expression (apply #'method-combination-type-lambda initargs)))
1494	(setf (get name 'method-combination-object)
1495	(apply '%make-long-method-combination
1496	:function (coerce-to-function lambda-expression) initargs))
1497	name))
1498
1499	(defun std-find-method-combination (gf name options)
1500	(declare (ignore gf))
1501	(when (and (eql name 'standard) options)
1502	;; CLHS DEFGENERIC
1503	(error "The standard method combination does not accept any arguments."))
1504	(let ((mc (get name 'method-combination-object)))
1505	(cond
1506	((null mc) (error "Method combination ~S not found" name))
1507	((null options) mc)
1508	((typep mc 'short-method-combination)
1509	(make-instance
1510	'short-method-combination
1511	:name name
1512	:documentation (method-combination-documentation mc)
1513	:operator (short-method-combination-operator mc)
1514	:identity-with-one-argument
1515	(short-method-combination-identity-with-one-argument mc)
1516	:options options))
1517	((typep mc 'long-method-combination)
1518	(make-instance
1519	'long-method-combination
1520	:name name
1521	:documentation (method-combination-documentation mc)
1522	:lambda-list (long-method-combination-lambda-list mc)
1523	:method-group-specs (long-method-combination-method-group-specs mc)
1524	:args-lambda-list (long-method-combination-args-lambda-list mc)
1525	:generic-function-symbol (long-method-combination-generic-function-symbol mc)
1526	:function (long-method-combination-function mc)
1527	:arguments (long-method-combination-arguments mc)
1528	:declarations (long-method-combination-declarations mc)
1529	:forms (long-method-combination-forms mc)
1530	:options options)))))
1531
1532	(declaim (notinline find-method-combination))
1533	(defun find-method-combination (gf name options)
1534	(std-find-method-combination gf name options))
1535
1536	(defconstant +the-standard-method-combination+
1537	(let ((instance (std-allocate-instance (find-class 'method-combination))))
1538	(setf (std-slot-value instance 'sys::name) 'standard)
1539	(setf (std-slot-value instance 'sys:%documentation)
1540	"The standard method combination.")
1541	(setf (std-slot-value instance 'options) nil)
1542	instance)
1543	"The standard method combination.
1544	Do not use this object for identity since it changes between
1545	compile-time and run-time. To detect the standard method combination,
1546	compare the method combination name to the symbol 'standard.")
1547	(setf (get 'standard 'method-combination-object) +the-standard-method-combination+)
1548
1549	(define-funcallable-primordial-class standard-generic-function (generic-function)
1550	((sys::name :initarg :name :initform nil)
1551	(sys::lambda-list :initarg :lambda-list :initform nil)
1552	(sys::required-args :initarg :required-args :initform nil)
1553	(sys::optional-args :initarg :optional-args :initform nil)
1554	(sys::initial-methods :initarg :initial-methods :initform nil)
1555	(sys::methods :initarg :methods :initform nil)
1556	(sys::method-class :initarg :method-class
1557	:initform +the-standard-method-class+)
1558	(sys::%method-combination :initarg :method-combination
1559	:initform +the-standard-method-combination+)
1560	(sys::argument-precedence-order :initarg :argument-precedence-order
1561	:initform nil)
1562	(sys::declarations :initarg :declarations :initform nil)
1563	(sys::%documentation :initarg :documentation :initform nil)))
1564	(defconstant +the-standard-generic-function-class+
1565	(find-class 'standard-generic-function))
1566
1567	(defun std-generic-function-p (gf)
1568	(eq (class-of gf) +the-standard-generic-function-class+))
1569
1570	(defparameter eql-specializer-table (make-hash-table :test 'eql))
1571
1572	(defun intern-eql-specializer (object)
1573	(or (gethash object eql-specializer-table)
1574	(setf (gethash object eql-specializer-table)
1575	;; we will be called during generic function invocation
1576	;; setup, so have to rely on plain functions here.
1577	(let ((instance (std-allocate-instance (find-class 'eql-specializer))))
1578	(setf (std-slot-value instance 'object) object)
1579	(setf (std-slot-value instance 'direct-methods) nil)
1580	instance))))
1581
1582	(defun eql-specializer-object (eql-specializer)
1583	(check-type eql-specializer eql-specializer)
1584	(std-slot-value eql-specializer 'object))
1585
1586	;;; Initial versions of some method metaobject readers. Defined on
1587	;;; AMOP pg. 218ff, will be redefined when generic functions are set up.
1588
1589	(defun std-method-function (method)
1590	(std-slot-value method 'sys::%function))
1591
1592	(defun std-method-generic-function (method)
1593	(std-slot-value method 'sys::%generic-function))
1594
1595	(defun std-method-specializers (method)
1596	(std-slot-value method 'sys::specializers))
1597
1598	(defun std-method-qualifiers (method)
1599	(std-slot-value method 'sys::qualifiers))
1600
1601	(defun std-accessor-method-slot-definition (accessor-method)
1602	(std-slot-value accessor-method 'sys::%slot-definition))
1603
1604	;;; Additional method readers
1605	(defun std-method-fast-function (method)
1606	(std-slot-value method 'sys::fast-function))
1607
1608	(defun std-function-keywords (method)
1609	(values (std-slot-value method 'sys::keywords)
1610	(std-slot-value method 'sys::other-keywords-p)))
1611
1612	;;; Preliminary accessor definitions, will be redefined as generic
1613	;;; functions later in this file
1614
1615	(declaim (notinline method-generic-function))
1616	(defun method-generic-function (method)
1617	(std-method-generic-function method))
1618
1619	(declaim (notinline method-function))
1620	(defun method-function (method)
1621	(std-method-function method))
1622
1623	(declaim (notinline method-specializers))
1624	(defun method-specializers (method)
1625	(std-method-specializers method))
1626
1627	(declaim (notinline method-qualifiers))
1628	(defun method-qualifiers (method)
1629	(std-method-qualifiers method))
1630
1631
1632
1633	;;; MOP (p. 216) specifies the following reader generic functions:
1634	;;; generic-function-argument-precedence-order
1635	;;; generic-function-declarations
1636	;;; generic-function-lambda-list
1637	;;; generic-function-method-class
1638	;;; generic-function-method-combination
1639	;;; generic-function-methods
1640	;;; generic-function-name
1641
1642	;;; Additionally, we define the following reader functions:
1643	;;; generic-function-required-arguments
1644	;;; generic-function-optional-arguments
1645
1646	;;; These are defined as functions here and redefined as generic
1647	;;; functions via atomic-defgeneric once we're all set up.
1648
1649	(defun generic-function-name (gf)
1650	(std-slot-value gf 'sys::name))
1651
1652	(defun generic-function-lambda-list (gf)
1653	(std-slot-value gf 'sys::lambda-list))
1654
1655	(defun generic-function-methods (gf)
1656	(std-slot-value gf 'sys::methods))
1657
1658	(defun generic-function-method-class (gf)
1659	(std-slot-value gf 'sys::method-class))
1660
1661	(defun generic-function-method-combination (gf)
1662	(std-slot-value gf 'sys::%method-combination))
1663
1664	(defun generic-function-argument-precedence-order (gf)
1665	(std-slot-value gf 'sys::argument-precedence-order))
1666
1667	(defun generic-function-required-arguments (gf)
1668	(std-slot-value gf 'sys::required-args))
1669
1670	(defun generic-function-optional-arguments (gf)
1671	(std-slot-value gf 'sys::optional-args))
1672
1673	(defun (setf method-lambda-list) (new-value method)
1674	(setf (std-slot-value method 'sys::lambda-list) new-value))
1675
1676	(defun (setf method-qualifiers) (new-value method)
1677	(setf (std-slot-value method 'sys::qualifiers) new-value))
1678
1679	(defun method-documentation (method)
1680	(std-slot-value method 'sys:%documentation))
1681
1682	(defun (setf method-documentation) (new-value method)
1683	(setf (std-slot-value method 'sys:%documentation) new-value))
1684
1685	;;; defgeneric
1686
1687	(defmacro defgeneric (function-name lambda-list
1688	&rest options-and-method-descriptions)
1689	(let ((options ())
1690	(methods ())
1691	(declarations ())
1692	(documentation nil))
1693	(dolist (item options-and-method-descriptions)
1694	(case (car item)
1695	(declare
1696	(setf declarations (append declarations (cdr item))))
1697	(:documentation
1698	(when documentation
1699	(error 'program-error
1700	:format-control "Documentation option was specified twice for generic function ~S."
1701	:format-arguments (list function-name)))
1702	(setf documentation t)
1703	(push item options))
1704	(:method
1705	;; KLUDGE (rudi 2013-04-02): this only works with subclasses
1706	;; of standard-generic-function, since the initial-methods
1707	;; slot is not mandated by AMOP
1708	(push
1709	`(push (defmethod ,function-name ,@(cdr item))
1710	(std-slot-value (fdefinition ',function-name) 'sys::initial-methods))
1711	methods))
1712	(t
1713	(push item options))))
1714	(when declarations (push (list :declarations declarations) options))
1715	(setf options (nreverse options)
1716	methods (nreverse methods))
1717	;; Since DEFGENERIC currently shares its argument parsing with
1718	;; DEFMETHOD, we perform this check here.
1719	(when (find '&aux lambda-list)
1720	(error 'program-error
1721	:format-control "&AUX is not allowed in a generic function lambda list: ~S"
1722	:format-arguments (list lambda-list)))
1723	`(prog1
1724	(%defgeneric
1725	',function-name
1726	:lambda-list ',lambda-list
1727	,@(canonicalize-defgeneric-options options))
1728	(sys::record-source-information-for-type ',function-name '(:generic-function ,function-name))
1729	,@methods)))
1730
1731	(defun canonicalize-defgeneric-options (options)
1732	(mapappend #'canonicalize-defgeneric-option options))
1733
1734	(defun canonicalize-defgeneric-option (option)
1735	(case (car option)
1736	(:generic-function-class
1737	(list :generic-function-class `(find-class ',(cadr option))))
1738	(:method-class
1739	(list :method-class `(find-class ',(cadr option))))
1740	(:method-combination
1741	(list :method-combination `',(cdr option)))
1742	(:argument-precedence-order
1743	(list :argument-precedence-order `',(cdr option)))
1744	(t
1745	(list `',(car option) `',(cadr option)))))
1746
1747	;; From OpenMCL (called canonicalize-argument-precedence-order there,
1748	;; but AMOP specifies argument-precedence-order to return a permutation
1749	;; of the required arguments, not a list of indices, so we calculate
1750	;; them on demand).
1751	(defun argument-precedence-order-indices (apo req)
1752	(cond ((equal apo req) nil)
1753	((not (eql (length apo) (length req)))
1754	(error 'program-error
1755	:format-control "Specified argument precedence order ~S does not match lambda list."
1756	:format-arguments (list apo)))
1757	(t (let ((res nil))
1758	(dolist (arg apo (nreverse res))
1759	(let ((index (position arg req)))
1760	(if (or (null index) (memq index res))
1761	(error 'program-error
1762	:format-control "Specified argument precedence order ~S does not match lambda list."
1763	:format-arguments (list apo)))
1764	(push index res)))))))
1765
1766	(defun find-generic-function (name &optional (errorp t))
1767	(let ((function (and (fboundp name) (fdefinition name))))
1768	(when function
1769	(when (typep function 'generic-function)
1770	(return-from find-generic-function function))
1771	(when (and traced-names (find name traced-names :test #'equal))
1772	(setf function (untraced-function name))
1773	(when (typep function 'generic-function)
1774	(return-from find-generic-function function)))))
1775	(if errorp
1776	(error "There is no generic function named ~S." name)
1777	nil))
1778
1779	(defun lambda-lists-congruent-p (lambda-list1 lambda-list2)
1780	(let* ((plist1 (analyze-lambda-list lambda-list1))
1781	(args1 (getf plist1 :required-args))
1782	(plist2 (analyze-lambda-list lambda-list2))
1783	(args2 (getf plist2 :required-args)))
1784	(= (length args1) (length args2))))
1785
1786	(defun %defgeneric (function-name &rest all-keys)
1787	(when (fboundp function-name)
1788	(let ((gf (fdefinition function-name)))
1789	(when (typep gf 'standard-generic-function)
1790	;; Remove methods defined by previous DEFGENERIC forms, as
1791	;; specified by CLHS, 7.7 (Macro DEFGENERIC). KLUDGE: only
1792	;; works for subclasses of standard-generic-function. Since
1793	;; AMOP doesn't specify a reader for initial methods, we have to
1794	;; skip this step otherwise.
1795	(dolist (method (std-slot-value gf 'sys::initial-methods))
1796	(std-remove-method gf method)
1797	(map-dependents gf
1798	#'(lambda (dep)
1799	(update-dependent gf dep
1800	'remove-method method))))
1801	(setf (std-slot-value gf 'sys::initial-methods) '()))))
1802	(apply 'ensure-generic-function function-name all-keys))
1803
1804	;;; Bootstrap version of ensure-generic-function, handling only
1805	;;; standard-generic-function. This function is replaced later.
1806	(declaim (notinline ensure-generic-function))
1807	(defun ensure-generic-function (function-name
1808	&rest all-keys
1809	&key
1810	(lambda-list nil lambda-list-supplied-p)
1811	(generic-function-class +the-standard-generic-function-class+)
1812	(method-class +the-standard-method-class+)
1813	(method-combination +the-standard-method-combination+ mc-p)
1814	argument-precedence-order
1815	(documentation nil documentation-supplied-p)
1816	&allow-other-keys)
1817	(setf all-keys (copy-list all-keys)) ; since we modify it
1818	(remf all-keys :generic-function-class)
1819	(let ((gf (find-generic-function function-name nil)))
1820	(if gf
1821	(progn
1822	(when lambda-list-supplied-p
1823	(unless (or (null (generic-function-methods gf))
1824	(lambda-lists-congruent-p lambda-list
1825	(generic-function-lambda-list gf)))
1826	(error 'simple-error
1827	:format-control "The lambda list ~S is incompatible with the existing methods of ~S."
1828	:format-arguments (list lambda-list gf)))
1829	(setf (std-slot-value gf 'sys::lambda-list) lambda-list)
1830	(let* ((plist (analyze-lambda-list lambda-list))
1831	(required-args (getf plist ':required-args)))
1832	(setf (std-slot-value gf 'sys::required-args) required-args)
1833	(setf (std-slot-value gf 'sys::optional-args)
1834	(getf plist :optional-args))))
1835	(setf (std-slot-value gf 'sys::argument-precedence-order)
1836	(or argument-precedence-order (generic-function-required-arguments gf)))
1837	(when documentation-supplied-p
1838	(setf (std-slot-value gf 'sys::%documentation) documentation))
1839	(finalize-standard-generic-function gf)
1840	gf)
1841	(progn
1842	(when (and (null clos-booting)
1843	(and (fboundp function-name)
1844	;; since we're overwriting an autoloader,
1845	;; we're probably meant to redefine it,
1846	;; so throwing an error here might be a bad idea.
1847	;; also, resolving the symbol isn't
1848	;; a good option either: we've seen that lead to
1849	;; recursive loading of the same file
1850	(and (not (autoloadp function-name))
1851	(and (consp function-name)
1852	(eq 'setf (first function-name))
1853	(not (autoload-ref-p (second function-name)))))))
1854	(error 'program-error
1855	:format-control "~A already names an ordinary function, macro, or special operator."
1856	:format-arguments (list function-name)))
1857	(when mc-p
1858	(error "Preliminary ensure-method does not support :method-combination argument."))
1859	(apply #'make-instance-standard-generic-function
1860	generic-function-class
1861	:name function-name
1862	:method-class method-class
1863	:method-combination method-combination
1864	all-keys)))))
1865
1866	(defun collect-eql-specializer-objects (generic-function)
1867	(let ((result nil))
1868	(dolist (method (generic-function-methods generic-function))
1869	(dolist (specializer (method-specializers method))
1870	(when (typep specializer 'eql-specializer)
1871	(pushnew (eql-specializer-object specializer)
1872	result
1873	:test 'eql))))
1874	result))
1875
1876	(defun finalize-standard-generic-function (gf)
1877	(%reinit-emf-cache gf (collect-eql-specializer-objects gf))
1878	(set-funcallable-instance-function
1879	gf
1880	(if (std-generic-function-p gf)
1881	(std-compute-discriminating-function gf)
1882	(compute-discriminating-function gf)))
1883	;; FIXME Do we need to warn on redefinition somewhere else?
1884	(let ((warn-on-redefinition nil))
1885	(setf (fdefinition (generic-function-name gf)) gf))
1886	(values))
1887
1888	(defun make-instance-standard-generic-function (generic-function-class
1889	&key name lambda-list
1890	(method-class +the-standard-method-class+)
1891	(method-combination +the-standard-method-combination+)
1892	argument-precedence-order
1893	declarations
1894	documentation)
1895	;; to avoid circularities, we do not call generic functions in here.
1896	(declare (ignore generic-function-class))
1897	(check-argument-precedence-order lambda-list argument-precedence-order)
1898	(let ((gf (allocate-funcallable-instance +the-standard-generic-function-class+)))
1899	(unless (classp method-class) (setf method-class (find-class method-class)))
1900	(unless (typep method-combination 'method-combination)
1901	(setf method-combination
1902	(find-method-combination
1903	gf (car method-combination) (cdr method-combination))))
1904	(setf (std-slot-value gf 'sys::name) name)
1905	(setf (std-slot-value gf 'sys::lambda-list) lambda-list)
1906	(setf (std-slot-value gf 'sys::initial-methods) ())
1907	(setf (std-slot-value gf 'sys::methods) ())
1908	(setf (std-slot-value gf 'sys::method-class) method-class)
1909	(setf (std-slot-value gf 'sys::%method-combination) method-combination)
1910	(setf (std-slot-value gf 'sys::declarations) declarations)
1911	(setf (std-slot-value gf 'sys::%documentation) documentation)
1912	(let* ((plist (analyze-lambda-list (generic-function-lambda-list gf)))
1913	(required-args (getf plist ':required-args)))
1914	(setf (std-slot-value gf 'sys::required-args) required-args)
1915	(setf (std-slot-value gf 'sys::optional-args) (getf plist :optional-args))
1916	(setf (std-slot-value gf 'sys::argument-precedence-order)
1917	(or argument-precedence-order required-args)))
1918	(finalize-standard-generic-function gf)
1919	gf))
1920
1921	(defun canonicalize-specializers (specializers)
1922	(mapcar #'canonicalize-specializer specializers))
1923
1924	(defun canonicalize-specializer (specializer)
1925	(cond ((classp specializer)
1926	specializer)
1927	((typep specializer 'eql-specializer)
1928	specializer)
1929	((symbolp specializer)
1930	(find-class specializer))
1931	((and (consp specializer)
1932	(eq (car specializer) 'eql))
1933	(let ((object (cadr specializer)))
1934	(when (and (consp object)
1935	(eq (car object) 'quote))
1936	(setf object (cadr object)))
1937	(intern-eql-specializer object)))
1938	((and (consp specializer)
1939	(eq (car specializer) 'java:jclass))
1940	(let ((jclass (eval specializer)))
1941	(java::ensure-java-class jclass)))
1942	(t
1943	(error "Unknown specializer: ~S" specializer))))
1944
1945	(defun parse-defmethod (args)
1946	(let ((function-name (car args))
1947	(qualifiers ())
1948	(specialized-lambda-list ())
1949	(body ())
1950	(parse-state :qualifiers))
1951	(dolist (arg (cdr args))
1952	(ecase parse-state
1953	(:qualifiers
1954	(if (and (atom arg) (not (null arg)))
1955	(push arg qualifiers)
1956	(progn
1957	(setf specialized-lambda-list arg)
1958	(setf parse-state :body))))
1959	(:body (push arg body))))
1960	(setf qualifiers (nreverse qualifiers)
1961	body (nreverse body))
1962	(multiple-value-bind (real-body declarations documentation)
1963	(parse-body body)
1964	(values function-name
1965	qualifiers
1966	(extract-lambda-list specialized-lambda-list)
1967	(extract-specializer-names specialized-lambda-list)
1968	documentation
1969	declarations
1970	(list* 'block
1971	(fdefinition-block-name function-name)
1972	real-body)))))
1973
1974	(defun required-portion (gf args)
1975	(let ((number-required (length (generic-function-required-arguments gf))))
1976	(when (< (length args) number-required)
1977	(error 'program-error
1978	:format-control "Not enough arguments for generic function ~S."
1979	:format-arguments (list (generic-function-name gf))))
1980	(subseq args 0 number-required)))
1981
1982	(defun extract-lambda-list (specialized-lambda-list)
1983	(let* ((plist (analyze-lambda-list specialized-lambda-list))
1984	(requireds (getf plist :required-names))
1985	(rv (getf plist :rest-var))
1986	(ks (getf plist :key-args))
1987	(keysp (getf plist :keysp))
1988	(aok (getf plist :allow-other-keys))
1989	(opts (getf plist :optional-args))
1990	(auxs (getf plist :auxiliary-args)))
1991	`(,@requireds
1992	,@(if opts `(&optional ,@opts) ())
1993	,@(if rv `(&rest ,rv) ())
1994	,@(if (or ks keysp aok) `(&key ,@ks) ())
1995	,@(if aok '(&allow-other-keys) ())
1996	,@(if auxs `(&aux ,@auxs) ()))))
1997
1998	(defun extract-specializer-names (specialized-lambda-list)
1999	(let ((plist (analyze-lambda-list specialized-lambda-list)))
2000	(getf plist ':specializers)))
2001
2002	(defun get-keyword-from-arg (arg)
2003	(if (listp arg)
2004	(if (listp (car arg))
2005	(caar arg)
2006	(make-keyword (car arg)))
2007	(make-keyword arg)))
2008
2009	(defun analyze-lambda-list (lambda-list)
2010	(let ((keys ()) ; Just the keywords
2011	(key-args ()) ; Keywords argument specs
2012	(keysp nil) ;
2013	(required-names ()) ; Just the variable names
2014	(required-args ()) ; Variable names & specializers
2015	(specializers ()) ; Just the specializers
2016	(rest-var nil)
2017	(optionals ())
2018	(auxs ())
2019	(allow-other-keys nil)
2020	(state :required))
2021	(dolist (arg lambda-list)
2022	(if (member arg lambda-list-keywords)
2023	(ecase arg
2024	(&optional
2025	(unless (eq state :required)
2026	(error 'program-error
2027	:format-control "~A followed by &OPTIONAL not allowed ~
2028	in lambda list ~S"
2029	:format-arguments (list state lambda-list)))
2030	(setq state '&optional))
2031	(&rest
2032	(unless (or (eq state :required)
2033	(eq state '&optional))
2034	(error 'program-error
2035	:format-control "~A followed by &REST not allowed ~
2036	in lambda list ~S"
2037	:format-arguments (list state lambda-list)))
2038	(setq state '&rest))
2039	(&key
2040	(unless (or (eq state :required)
2041	(eq state '&optional)
2042	(eq state '&rest))
2043	(error 'program-error
2044	:format-control "~A followed by &KEY not allowed
2045	in lambda list ~S"
2046	:format-arguments (list state lambda-list)))
2047	(setq keysp t)
2048	(setq state '&key))
2049	(&allow-other-keys
2050	(unless (eq state '&key)
2051	(error 'program-error
2052	:format-control "&ALLOW-OTHER-KEYS not allowed while
2053	parsing ~A in lambda list ~S"
2054	:format-arguments (list state lambda-list)))
2055	(setq allow-other-keys 't))
2056	(&aux
2057	;; &aux comes last; any other previous state is fine
2058	(setq state '&aux)))
2059	(case state
2060	(:required
2061	(push-on-end arg required-args)
2062	(if (listp arg)
2063	(progn (push-on-end (car arg) required-names)
2064	(push-on-end (cadr arg) specializers))
2065	(progn (push-on-end arg required-names)
2066	(push-on-end 't specializers))))
2067	(&optional (push-on-end arg optionals))
2068	(&rest (setq rest-var arg))
2069	(&key
2070	(push-on-end (get-keyword-from-arg arg) keys)
2071	(push-on-end arg key-args))
2072	(&aux (push-on-end arg auxs)))))
2073	(list :required-names required-names
2074	:required-args required-args
2075	:specializers specializers
2076	:rest-var rest-var
2077	:keywords keys
2078	:key-args key-args
2079	:keysp keysp
2080	:auxiliary-args auxs
2081	:optional-args optionals
2082	:allow-other-keys allow-other-keys)))
2083
2084	#+nil
2085	(defun check-method-arg-info (gf arg-info method)
2086	(multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
2087	(analyze-lambda-list (if (consp method)
2088	(early-method-lambda-list method)
2089	(method-lambda-list method)))
2090	(flet ((lose (string &rest args)
2091	(error 'simple-program-error
2092	:format-control "~@<attempt to add the method~2I~_~S~I~_~
2093	to the generic function~2I~_~S;~I~_~
2094	but ~?~:>"
2095	:format-arguments (list method gf string args)))
2096	(comparison-description (x y)
2097	(if (> x y) "more" "fewer")))
2098	(let ((gf-nreq (arg-info-number-required arg-info))
2099	(gf-nopt (arg-info-number-optional arg-info))
2100	(gf-key/rest-p (arg-info-key/rest-p arg-info))
2101	(gf-keywords (arg-info-keys arg-info)))
2102	(unless (= nreq gf-nreq)
2103	(lose
2104	"the method has ~A required arguments than the generic function."
2105	(comparison-description nreq gf-nreq)))
2106	(unless (= nopt gf-nopt)
2107	(lose
2108	"the method has ~A optional arguments than the generic function."
2109	(comparison-description nopt gf-nopt)))
2110	(unless (eq (or keysp restp) gf-key/rest-p)
2111	(lose
2112	"the method and generic function differ in whether they accept~_~
2113	&REST or &KEY arguments."))
2114	(when (consp gf-keywords)
2115	(unless (or (and restp (not keysp))
2116	allow-other-keys-p
2117	(every (lambda (k) (memq k keywords)) gf-keywords))
2118	(lose "the method does not accept each of the &KEY arguments~2I~_~
2119	~S."
2120	gf-keywords)))))))
2121
2122	(defun check-method-lambda-list (name method-lambda-list gf-lambda-list)
2123	(let* ((gf-restp (not (null (memq '&rest gf-lambda-list))))
2124	(gf-plist (analyze-lambda-list gf-lambda-list))
2125	(gf-keysp (getf gf-plist :keysp))
2126	(gf-keywords (getf gf-plist :keywords))
2127	(method-plist (analyze-lambda-list method-lambda-list))
2128	(method-restp (not (null (memq '&rest method-lambda-list))))
2129	(method-keysp (getf method-plist :keysp))
2130	(method-keywords (getf method-plist :keywords))
2131	(method-allow-other-keys-p (getf method-plist :allow-other-keys)))
2132	(unless (= (length (getf gf-plist :required-args))
2133	(length (getf method-plist :required-args)))
2134	(error "The method-lambda-list ~S ~
2135	has the wrong number of required arguments ~
2136	for the generic function ~S." method-lambda-list name))
2137	(unless (= (length (getf gf-plist :optional-args))
2138	(length (getf method-plist :optional-args)))
2139	(error "The method-lambda-list ~S ~
2140	has the wrong number of optional arguments ~
2141	for the generic function ~S." method-lambda-list name))
2142	(unless (eq (or gf-restp gf-keysp) (or method-restp method-keysp))
2143	(error "The method-lambda-list ~S ~
2144	and the generic function ~S ~
2145	differ in whether they accept &REST or &KEY arguments."
2146	method-lambda-list name))
2147	(when (consp gf-keywords)
2148	(unless (or (and method-restp (not method-keysp))
2149	method-allow-other-keys-p
2150	(every (lambda (k) (memq k method-keywords)) gf-keywords))
2151	(error "The method-lambda-list ~S does not accept ~
2152	all of the keyword arguments defined for the ~
2153	generic function." method-lambda-list name)))))
2154
2155	(defun check-argument-precedence-order (lambda-list argument-precedence-order)
2156	(when argument-precedence-order
2157	(if lambda-list
2158	;; raising the required program-errors is a side-effect of
2159	;; calculating the given permutation of apo vs req
2160	(argument-precedence-order-indices
2161	argument-precedence-order
2162	(getf (analyze-lambda-list lambda-list) :required-args))
2163	;; AMOP pg. 198
2164	(error 'program-error "argument precedence order specified without lambda list"))))
2165
2166	(defvar gf-initialize-instance nil
2167	"Cached value of the INITIALIZE-INSTANCE generic function.
2168	Initialized with the true value near the end of the file.")
2169	(defvar gf-allocate-instance nil
2170	"Cached value of the ALLOCATE-INSTANCE generic function.
2171	Initialized with the true value near the end of the file.")
2172	(defvar gf-shared-initialize nil
2173	"Cached value of the SHARED-INITIALIZE generic function.
2174	Initialized with the true value near the end of the file.")
2175	(defvar gf-reinitialize-instance nil
2176	"Cached value of the REINITIALIZE-INSTANCE generic function.
2177	Initialized with the true value near the end of the file.")
2178
2179	(declaim (ftype (function * method) ensure-method))
2180	(defun ensure-method (name &rest all-keys)
2181	(let ((method-lambda-list (getf all-keys :lambda-list))
2182	(gf (find-generic-function name nil)))
2183	(when (or (eq gf gf-initialize-instance)
2184	(eq gf gf-allocate-instance)
2185	(eq gf gf-shared-initialize)
2186	(eq gf gf-reinitialize-instance))
2187	;; ### Clearly, this can be targeted much more exact
2188	;; as we only need to remove the specializing class and all
2189	;; its subclasses from the hash.
2190	(clrhash make-instance-initargs-cache)
2191	(clrhash reinitialize-instance-initargs-cache))
2192	(if gf
2193	(restart-case
2194	(check-method-lambda-list name method-lambda-list
2195	(generic-function-lambda-list gf))
2196	(unbind-and-try-again () :report (lambda(s) (format s "Undefine generic function #'~a and continue" name))
2197	(fmakunbound name)
2198	(setf gf (ensure-generic-function name :lambda-list method-lambda-list))))
2199	(setf gf (ensure-generic-function name :lambda-list method-lambda-list)))
2200	(let ((method
2201	(if (eq (generic-function-method-class gf) +the-standard-method-class+)
2202	(apply #'make-instance-standard-method gf all-keys)
2203	(apply #'make-instance (generic-function-method-class gf) all-keys))))
2204	(if (and
2205	(eq (generic-function-method-class gf) +the-standard-method-class+)
2206	(std-generic-function-p gf))
2207	(progn
2208	(std-add-method gf method)
2209	(map-dependents gf
2210	#'(lambda (dep)
2211	(update-dependent gf dep 'add-method method))))
2212	(add-method gf method))
2213	method)))
2214
2215	(defun make-instance-standard-method (gf
2216	&key
2217	lambda-list
2218	qualifiers
2219	specializers
2220	documentation
2221	function
2222	fast-function)
2223	(declare (ignore gf))
2224	(let ((method (std-allocate-instance +the-standard-method-class+))
2225	(analyzed-args (analyze-lambda-list lambda-list)))
2226	(setf (method-lambda-list method) lambda-list)
2227	(setf (method-qualifiers method) qualifiers)
2228	(setf (std-slot-value method 'sys::specializers)
2229	(canonicalize-specializers specializers))
2230	(setf (method-documentation method) documentation)
2231	(setf (std-slot-value method 'sys::%generic-function) nil) ; set by add-method
2232	(setf (std-slot-value method 'sys::%function) function)
2233	(setf (std-slot-value method 'sys::fast-function) fast-function)
2234	(setf (std-slot-value method 'sys::keywords) (getf analyzed-args :keywords))
2235	(setf (std-slot-value method 'sys::other-keywords-p)
2236	(getf analyzed-args :allow-other-keys))
2237	method))
2238
2239	;;; To be redefined as generic functions later
2240	(declaim (notinline add-direct-method))
2241	(defun add-direct-method (specializer method)
2242	(if (typep specializer 'eql-specializer)
2243	(pushnew method (std-slot-value specializer 'direct-methods))
2244	(pushnew method (class-direct-methods specializer))))
2245
2246	(declaim (notinline remove-direct-method))
2247	(defun remove-direct-method (specializer method)
2248	(if (typep specializer 'eql-specializer)
2249	(setf (std-slot-value specializer 'direct-methods)
2250	(remove method (std-slot-value specializer 'direct-methods)))
2251	(setf (class-direct-methods specializer)
2252	(remove method (class-direct-methods specializer)))))
2253
2254	(defun std-add-method (gf method)
2255	;; calls sites need to make sure that method is either a method of the
2256	;; given gf or does not have a gf.
2257	(let ((old-method (%find-method gf (std-method-qualifiers method)
2258	(method-specializers method) nil)))
2259	(when old-method
2260	(if (and (std-generic-function-p gf)
2261	(eq (class-of old-method) +the-standard-method-class+))
2262	(std-remove-method gf old-method)
2263	(remove-method gf old-method))))
2264	(setf (std-slot-value method 'sys::%generic-function) gf)
2265	(push method (std-slot-value gf 'sys::methods))
2266	(dolist (specializer (method-specializers method))
2267	(add-direct-method specializer method))
2268	(finalize-standard-generic-function gf)
2269	gf)
2270
2271	(defun std-remove-method (gf method)
2272	(setf (std-slot-value gf 'sys::methods)
2273	(remove method (generic-function-methods gf)))
2274	(setf (std-slot-value method 'sys::%generic-function) nil)
2275	(dolist (specializer (method-specializers method))
2276	(remove-direct-method specializer method))
2277	(finalize-standard-generic-function gf)
2278	gf)
2279
2280	(defun %find-method (gf qualifiers specializers &optional (errorp t))
2281	;; "If the specializers argument does not correspond in length to the number
2282	;; of required arguments of the generic-function, an an error of type ERROR
2283	;; is signaled."
2284	(unless (= (length specializers) (length (generic-function-required-arguments gf)))
2285	(error "The specializers argument has length ~S, but ~S has ~S required parameters."
2286	(length specializers)
2287	gf
2288	(length (generic-function-required-arguments gf))))
2289	(let* ((canonical-specializers (canonicalize-specializers specializers))
2290	(method
2291	(find-if #'(lambda (method)
2292	(and (equal qualifiers
2293	(method-qualifiers method))
2294	(equal canonical-specializers
2295	(method-specializers method))))
2296	(generic-function-methods gf))))
2297	(if (and (null method) errorp)
2298	(error "No such method for ~S." (generic-function-name gf))
2299	method)))
2300
2301	(defun fast-callable-p (gf)
2302	(and (eq (method-combination-name (generic-function-method-combination gf))
2303	'standard)
2304	(null (intersection (generic-function-lambda-list gf)
2305	'(&rest &optional &key &allow-other-keys &aux)))))
2306
2307	(defun std-compute-discriminating-function (gf)
2308	;; In this function, we know that gf is of class
2309	;; standard-generic-function, so we can access the instance's slots
2310	;; via std-slot-value. This breaks circularities when redefining
2311	;; generic function accessors.
2312	(let ((methods (std-slot-value gf 'sys::methods)))
2313	(cond
2314	((and (= (length methods) 1)
2315	(eq (type-of (car methods)) 'standard-reader-method)
2316	(eq (type-of (car (std-method-specializers (car methods))))
2317	'standard-class))
2318	(let* ((method (first methods))
2319	(slot-definition (std-slot-value method 'sys::%slot-definition))
2320	(slot-name (std-slot-value slot-definition 'sys:name))
2321	(class (car (std-method-specializers method))))
2322	#'(lambda (instance)
2323	;; TODO: elide this test for low values of SAFETY
2324	(unless (typep instance class)
2325	(no-applicable-method gf (list instance)))
2326	;; hash table lookup for slot position in Layout object via
2327	;; StandardObject.SLOT_VALUE, so should be reasonably fast
2328	(std-slot-value instance slot-name))))
2329	((and (= (length methods) 1)
2330	(eq (type-of (car methods)) 'standard-writer-method)
2331	(eq (type-of (second (std-method-specializers (car methods))))
2332	'standard-class))
2333	(let* ((method (first methods))
2334	(slot-definition (std-slot-value method 'sys::%slot-definition))
2335	(slot-name (std-slot-value slot-definition 'sys:name))
2336	(class (car (std-method-specializers method))))
2337	#'(lambda (new-value instance)
2338	;; TODO: elide this test for low values of SAFETY
2339	(unless (typep instance class)
2340	(no-applicable-method gf (list new-value instance)))
2341	;; hash table lookup for slot position in Layout object via
2342	;; StandardObject.SET_SLOT_VALUE, so should be reasonably fast
2343	(setf (std-slot-value instance slot-name) new-value))))
2344	(t
2345	(let* ((number-required (length (generic-function-required-arguments gf)))
2346	(lambda-list (generic-function-lambda-list gf))
2347	(exact (null (intersection lambda-list
2348	'(&rest &optional &key
2349	&allow-other-keys))))
2350	(no-aux (null (some
2351	(lambda (method)
2352	(find '&aux (std-slot-value method 'sys::lambda-list)))
2353	methods))))
2354	(if (and exact
2355	no-aux)
2356	(cond
2357	((= number-required 1)
2358	(cond
2359	((and (eq (method-combination-name
2360	(std-slot-value gf 'sys::%method-combination))
2361	'standard)
2362	(= (length methods) 1)
2363	(std-method-fast-function (%car methods)))
2364	(let* ((method (%car methods))
2365	(specializer (car (std-method-specializers method)))
2366	(function (std-method-fast-function method)))
2367	(if (typep specializer 'eql-specializer)
2368	(let ((specializer-object (eql-specializer-object specializer)))
2369	#'(lambda (arg)
2370	(declare (optimize speed))
2371	(if (eql arg specializer-object)
2372	(funcall function arg)
2373	(no-applicable-method gf (list arg)))))
2374	#'(lambda (arg)
2375	(declare (optimize speed))
2376	(unless (simple-typep arg specializer)
2377	;; FIXME no applicable method
2378	(error 'simple-type-error
2379	:datum arg
2380	:expected-type specializer))
2381	(funcall function arg)))))
2382	(t
2383	#'(lambda (arg)
2384	(declare (optimize speed))
2385	(let* ((args (list arg))
2386	(emfun (get-cached-emf gf args)))
2387	(if emfun
2388	(funcall emfun args)
2389	(slow-method-lookup gf args)))))))
2390	((= number-required 2)
2391	#'(lambda (arg1 arg2)
2392	(declare (optimize speed))
2393	(let* ((args (list arg1 arg2))
2394	(emfun (get-cached-emf gf args)))
2395	(if emfun
2396	(funcall emfun args)
2397	(slow-method-lookup gf args)))))
2398	((= number-required 3)
2399	#'(lambda (arg1 arg2 arg3)
2400	(declare (optimize speed))
2401	(let* ((args (list arg1 arg2 arg3))
2402	(emfun (get-cached-emf gf args)))
2403	(if emfun
2404	(funcall emfun args)
2405	(slow-method-lookup gf args)))))
2406	(t
2407	#'(lambda (&rest args)
2408	(declare (optimize speed))
2409	(let ((len (length args)))
2410	(unless (= len number-required)
2411	(error 'program-error
2412	:format-control "Not enough arguments for generic function ~S."
2413	:format-arguments (list (generic-function-name gf)))))
2414	(let ((emfun (get-cached-emf gf args)))
2415	(if emfun
2416	(funcall emfun args)
2417	(slow-method-lookup gf args))))))
2418	#'(lambda (&rest args)
2419	(declare (optimize speed))
2420	(let ((len (length args)))
2421	(unless (>= len number-required)
2422	(error 'program-error
2423	:format-control "Not enough arguments for generic function ~S."
2424	:format-arguments (list (generic-function-name gf)))))
2425	(let ((emfun (get-cached-emf gf args)))
2426	(if emfun
2427	(funcall emfun args)
2428	(slow-method-lookup gf args))))))))))
2429
2430	(defun sort-methods (methods gf required-classes)
2431	(if (or (null methods) (null (%cdr methods)))
2432	methods
2433	(sort methods
2434	(if (std-generic-function-p gf)
2435	(let ((method-indices
2436	(argument-precedence-order-indices
2437	(generic-function-argument-precedence-order gf)
2438	(getf (analyze-lambda-list (generic-function-lambda-list gf))
2439	':required-args))))
2440	#'(lambda (m1 m2)
2441	(std-method-more-specific-p
2442	m1 m2 required-classes method-indices)))
2443	#'(lambda (m1 m2)
2444	(method-more-specific-p gf m1 m2 required-classes))))))
2445
2446	(defun method-applicable-p (method args)
2447	(do* ((specializers (method-specializers method) (cdr specializers))
2448	(args args (cdr args)))
2449	((null specializers) t)
2450	(let ((specializer (car specializers)))
2451	(if (typep specializer 'eql-specializer)
2452	(unless (eql (car args) (eql-specializer-object specializer))
2453	(return nil))
2454	(unless (subclassp (class-of (car args)) specializer)
2455	(return nil))))))
2456
2457	(defun std-compute-applicable-methods (gf args)
2458	(let ((required-classes (mapcar #'class-of (required-portion gf args)))
2459	(methods '()))
2460	(dolist (method (generic-function-methods gf))
2461	(when (method-applicable-p method args)
2462	(push method methods)))
2463	(sort-methods methods gf required-classes)))
2464
2465	(declaim (notinline compute-applicable-methods))
2466	(defun compute-applicable-methods (gf args)
2467	(std-compute-applicable-methods gf args))
2468
2469	;;; METHOD-APPLICABLE-USING-CLASSES-P
2470	;;;
2471	;;; If the first return value is T, METHOD is definitely applicable to
2472	;;; arguments that are instances of CLASSES. If the first value is
2473	;;; NIL and the second value is T, METHOD is definitely not applicable
2474	;;; to arguments that are instances of CLASSES; if the second value is
2475	;;; NIL the applicability of METHOD cannot be determined by inspecting
2476	;;; the classes of its arguments only.
2477	;;;
2478	(defun method-applicable-using-classes-p (method classes)
2479	(do* ((specializers (method-specializers method) (cdr specializers))
2480	(classes classes (cdr classes))
2481	(knownp t))
2482	((null specializers)
2483	(if knownp (values t t) (values nil nil)))
2484	(let ((specializer (car specializers)))
2485	(if (typep specializer 'eql-specializer)
2486	(if (eql (class-of (eql-specializer-object specializer))
2487	(car classes))
2488	(setf knownp nil)
2489	(return (values nil t)))
2490	(unless (subclassp (car classes) specializer)
2491	(return (values nil t)))))))
2492
2493	(defun check-applicable-method-keyword-args (gf args
2494	keyword-args
2495	applicable-keywords)
2496	(when (oddp (length keyword-args))
2497	(error 'program-error
2498	:format-control "Odd number of keyword arguments in call to ~S ~
2499	with arguments list ~S"
2500	:format-arguments (list gf args)))
2501	(unless (getf keyword-args :allow-other-keys)
2502	(loop for key in keyword-args by #'cddr
2503	unless (or (member key applicable-keywords)
2504	(eq key :allow-other-keys))
2505	do (error 'program-error
2506	:format-control "Invalid keyword argument ~S in call ~
2507	to ~S with argument list ~S."
2508	:format-arguments (list key gf args)))))
2509
2510	(defun compute-applicable-keywords (gf applicable-methods)
2511	(let ((applicable-keywords
2512	(getf (analyze-lambda-list (generic-function-lambda-list gf))
2513	:keywords)))
2514	(loop for method in applicable-methods
2515	do (multiple-value-bind
2516	(keywords allow-other-keys)
2517	(function-keywords method)
2518	(when allow-other-keys
2519	(setf applicable-keywords :any)
2520	(return))
2521	(setf applicable-keywords
2522	(union applicable-keywords keywords))))
2523	applicable-keywords))
2524
2525	(defun wrap-emfun-for-keyword-args-check (gf emfun non-keyword-args
2526	applicable-keywords)
2527	#'(lambda (args)
2528	(check-applicable-method-keyword-args
2529	gf args
2530	(nthcdr non-keyword-args args) applicable-keywords)
2531	(funcall emfun args)))
2532
2533	(defun slow-method-lookup (gf args)
2534	(let ((applicable-methods
2535	(if (std-generic-function-p gf)
2536	(std-compute-applicable-methods gf args)
2537	(or (compute-applicable-methods-using-classes gf (mapcar #'class-of args))
2538	(compute-applicable-methods gf args)))))
2539	(if applicable-methods
2540	(let* ((emfun (funcall (if (std-generic-function-p gf)
2541	#'std-compute-effective-method
2542	#'compute-effective-method)
2543	gf (generic-function-method-combination gf)
2544	applicable-methods))
2545	(non-keyword-args (+ (length (generic-function-required-arguments gf))
2546	(length (generic-function-optional-arguments gf))))
2547	(gf-lambda-list (generic-function-lambda-list gf))
2548	(checks-required (and (member '&key gf-lambda-list)
2549	(not (member '&allow-other-keys
2550	gf-lambda-list))))
2551	(applicable-keywords
2552	(when checks-required
2553	;; Don't do applicable keyword checks when this is
2554	;; one of the 'exceptional four' or when the gf allows
2555	;; other keywords.
2556	(compute-applicable-keywords gf applicable-methods))))
2557	(when (and checks-required
2558	(not (eq applicable-keywords :any)))
2559	(setf emfun
2560	(wrap-emfun-for-keyword-args-check gf emfun non-keyword-args
2561	applicable-keywords)))
2562	(cache-emf gf args emfun)
2563	(funcall emfun args))
2564	(apply #'no-applicable-method gf args))))
2565
2566	(defun sub-specializer-p (c1 c2 c-arg)
2567	(find c2 (cdr (memq c1 (%class-precedence-list c-arg)))))
2568
2569	(defun std-method-more-specific-p (method1 method2 required-classes argument-precedence-order)
2570	(if argument-precedence-order
2571	(let ((specializers-1 (std-method-specializers method1))
2572	(specializers-2 (std-method-specializers method2)))
2573	(dolist (index argument-precedence-order)
2574	(let ((spec1 (nth index specializers-1))
2575	(spec2 (nth index specializers-2)))
2576	(unless (eq spec1 spec2)
2577	(cond ((typep spec1 'eql-specializer)
2578	(return t))
2579	((typep spec2 'eql-specializer)
2580	(return nil))
2581	(t
2582	(return (sub-specializer-p spec1 spec2
2583	(nth index required-classes)))))))))
2584	(do ((specializers-1 (std-method-specializers method1) (cdr specializers-1))
2585	(specializers-2 (std-method-specializers method2) (cdr specializers-2))
2586	(classes required-classes (cdr classes)))
2587	((null specializers-1) nil)
2588	(let ((spec1 (car specializers-1))
2589	(spec2 (car specializers-2)))
2590	(unless (eq spec1 spec2)
2591	(cond ((typep spec1 'eql-specializer)
2592	(return t))
2593	((typep spec2 'eql-specializer)
2594	(return nil))
2595	(t
2596	(return (sub-specializer-p spec1 spec2 (car classes))))))))))
2597
2598	(defun primary-method-p (method)
2599	(null (intersection '(:before :after :around) (method-qualifiers method))))
2600
2601	(defun before-method-p (method)
2602	(equal '(:before) (method-qualifiers method)))
2603
2604	(defun after-method-p (method)
2605	(equal '(:after) (method-qualifiers method)))
2606
2607	(defun around-method-p (method)
2608	(equal '(:around) (method-qualifiers method)))
2609
2610	(defun process-next-method-list (next-method-list)
2611	(mapcar #'(lambda (next-method-form)
2612	(cond
2613	((listp next-method-form)
2614	(assert (eq (first next-method-form) 'make-method))
2615	(let* ((rest-sym (gensym)))
2616	(make-instance-standard-method
2617	nil ;; ignored
2618	:lambda-list (list '&rest rest-sym)
2619	:function (compute-method-function `(lambda (&rest ,rest-sym)
2620	,(second next-method-form))))))
2621	(t
2622	(assert (typep next-method-form 'method))
2623	next-method-form)))
2624	next-method-list))
2625
2626	(defun std-compute-effective-method (gf method-combination methods)
2627	(assert (typep method-combination 'method-combination))
2628	(let* ((mc-name (method-combination-name method-combination))
2629	(options (slot-value method-combination 'options))
2630	(order (car options))
2631	(primaries '())
2632	(arounds '())
2633	around
2634	emf-form
2635	(long-method-combination-p
2636	(typep method-combination 'long-method-combination)))
2637	(unless long-method-combination-p
2638	(dolist (m methods)
2639	(let ((qualifiers (method-qualifiers m)))
2640	(cond ((null qualifiers)
2641	(if (eq mc-name 'standard)
2642	(push m primaries)
2643	(error "Method combination type mismatch: missing qualifier for method combination ~S." method-combination)))
2644	((cdr qualifiers)
2645	(error "Invalid method qualifiers."))
2646	((eq (car qualifiers) :around)
2647	(push m arounds))
2648	((eq (car qualifiers) mc-name)
2649	(push m primaries))
2650	((memq (car qualifiers) '(:before :after)))
2651	(t
2652	(error "Invalid method qualifiers."))))))
2653	(unless (eq order :most-specific-last)
2654	(setf primaries (nreverse primaries)))
2655	(setf arounds (nreverse arounds))
2656	(setf around (car arounds))
2657	(when (and (null primaries) (not long-method-combination-p))
2658	(error "No primary methods for the generic function ~S." gf))
2659	(cond
2660	(around
2661	(let ((next-emfun
2662	(funcall
2663	(if (std-generic-function-p gf)
2664	#'std-compute-effective-method
2665	#'compute-effective-method)
2666	gf method-combination (remove around methods))))
2667	(setf emf-form
2668	(generate-emf-lambda (method-function around) next-emfun))))
2669	((eq mc-name 'standard)
2670	(let* ((next-emfun (compute-primary-emfun (cdr primaries)))
2671	(befores (remove-if-not #'before-method-p methods))
2672	(reverse-afters
2673	(reverse (remove-if-not #'after-method-p methods))))
2674	(setf emf-form
2675	(cond
2676	((and (null befores) (null reverse-afters))
2677	(let ((fast-function (std-method-fast-function (car primaries))))
2678	(if fast-function
2679	(ecase (length (generic-function-required-arguments gf))
2680	(1
2681	#'(lambda (args)
2682	(declare (optimize speed))
2683	(funcall fast-function (car args))))
2684	(2
2685	#'(lambda (args)
2686	(declare (optimize speed))
2687	(funcall fast-function (car args) (cadr args)))))
2688	(generate-emf-lambda (std-method-function (car primaries))
2689	next-emfun))))
2690	(t
2691	(let ((method-function (method-function (car primaries))))
2692	#'(lambda (args)
2693	(declare (optimize speed))
2694	(dolist (before befores)
2695	(funcall (method-function before) args nil))
2696	(multiple-value-prog1
2697	(funcall method-function args next-emfun)
2698	(dolist (after reverse-afters)
2699	(funcall (method-function after) args nil))))))))))
2700	(long-method-combination-p
2701	(let ((function (long-method-combination-function method-combination))
2702	(arguments (slot-value method-combination 'options)))
2703	(assert function)
2704	(setf emf-form
2705	(if arguments
2706	(apply function gf methods arguments)
2707	(funcall function gf methods)))))
2708	(t
2709	(unless (typep method-combination 'short-method-combination)
2710	(error "Unsupported method combination type ~A." mc-name))
2711	(let ((operator (short-method-combination-operator method-combination))
2712	(ioa (short-method-combination-identity-with-one-argument method-combination)))
2713	(setf emf-form
2714	(if (and ioa (null (cdr primaries)))
2715	(generate-emf-lambda (method-function (car primaries)) nil)
2716	`(lambda (args)
2717	(,operator ,@(mapcar
2718	(lambda (primary)
2719	`(funcall ,(method-function primary) args nil))
2720	primaries))))))))
2721	(assert (not (null emf-form)))
2722	(or #+nil (ignore-errors (autocompile emf-form))
2723	(coerce-to-function emf-form))))
2724
2725	(defun generate-emf-lambda (method-function next-emfun)
2726	#'(lambda (args)
2727	(declare (optimize speed))
2728	(funcall method-function args next-emfun)))
2729
2730	;;; compute an effective method function from a list of primary methods:
2731
2732	(defun compute-primary-emfun (methods)
2733	(if (null methods)
2734	nil
2735	(let ((next-emfun (compute-primary-emfun (cdr methods))))
2736	#'(lambda (args)
2737	(funcall (std-method-function (car methods)) args next-emfun)))))
2738
2739	(defvar call-next-method-p)
2740	(defvar next-method-p-p)
2741
2742	(defun walk-form (form)
2743	(cond ((atom form)
2744	(cond ((eq form 'call-next-method)
2745	(setf call-next-method-p t))
2746	((eq form 'next-method-p)
2747	(setf next-method-p-p t))))
2748	(t
2749	(walk-form (%car form))
2750	(walk-form (%cdr form)))))
2751
2752	(defun compute-method-function (lambda-expression)
2753	(let ((lambda-list (allow-other-keys (cadr lambda-expression)))
2754	(body (cddr lambda-expression)))
2755	(multiple-value-bind (body declarations) (parse-body body)
2756	(let ((ignorable-vars '()))
2757	(dolist (var lambda-list)
2758	(if (memq var lambda-list-keywords)
2759	(return)
2760	(push var ignorable-vars)))
2761	(push `(declare (ignorable ,@ignorable-vars)) declarations))
2762	(if (null (intersection lambda-list '(&rest &optional &key &allow-other-keys &aux)))
2763	;; Required parameters only.
2764	(case (length lambda-list)
2765	(1
2766	`(lambda (args next-emfun)
2767	(let ((,(%car lambda-list) (%car args)))
2768	(declare (ignorable ,(%car lambda-list)))
2769	,@declarations
2770	(flet ((call-next-method (&rest cnm-args)
2771	(if (null next-emfun)
2772	(error "No next method for generic function.")
2773	(funcall next-emfun (or cnm-args args))))
2774	(next-method-p ()
2775	(not (null next-emfun))))
2776	(declare (ignorable (function call-next-method)
2777	(function next-method-p)))
2778	,@body))))
2779
2780	(2
2781	`(lambda (args next-emfun)
2782	(let ((,(%car lambda-list) (%car args))
2783	(,(%cadr lambda-list) (%cadr args)))
2784	(declare (ignorable ,(%car lambda-list)
2785	,(%cadr lambda-list)))
2786	,@declarations
2787	(flet ((call-next-method (&rest cnm-args)
2788	(if (null next-emfun)
2789	(error "No next method for generic function.")
2790	(funcall next-emfun (or cnm-args args))))
2791	(next-method-p ()
2792	(not (null next-emfun))))
2793	(declare (ignorable (function call-next-method)
2794	(function next-method-p)))
2795
2796	,@body))))
2797	(3
2798	`(lambda (args next-emfun)
2799	(let ((,(%car lambda-list) (%car args))
2800	(,(%cadr lambda-list) (%cadr args))
2801	(,(%caddr lambda-list) (%caddr args)))
2802	(declare (ignorable ,(%car lambda-list)
2803	,(%cadr lambda-list)
2804	,(%caddr lambda-list)))
2805	,@declarations
2806	(flet ((call-next-method (&rest cnm-args)
2807	(if (null next-emfun)
2808	(error "No next method for generic function.")
2809	(funcall next-emfun (or cnm-args args))))
2810	(next-method-p ()
2811	(not (null next-emfun))))
2812	(declare (ignorable (function call-next-method)
2813	(function next-method-p)))
2814	,@body))))
2815	(t
2816	`(lambda (args next-emfun)
2817	(apply #'(lambda ,lambda-list
2818	,@declarations
2819	(flet ((call-next-method (&rest cnm-args)
2820	(if (null next-emfun)
2821	(error "No next method for generic function.")
2822	(funcall next-emfun (or cnm-args args))))
2823	(next-method-p ()
2824	(not (null next-emfun))))
2825	(declare (ignorable (function call-next-method)
2826	(function next-method-p)))
2827	,@body))
2828	args))))
2829	`(lambda (args next-emfun)
2830	(apply #'(lambda ,lambda-list
2831	,@declarations
2832	(flet ((call-next-method (&rest cnm-args)
2833	(if (null next-emfun)
2834	(error "No next method for generic function.")
2835	(funcall next-emfun (or cnm-args args))))
2836	(next-method-p ()
2837	(not (null next-emfun))))
2838	(declare (ignorable (function call-next-method)
2839	(function next-method-p)))
2840
2841	,@body))
2842	args))))))
2843
2844	(defun compute-method-fast-function (lambda-expression)
2845	(let ((lambda-list (allow-other-keys (cadr lambda-expression))))
2846	(when (intersection lambda-list '(&rest &optional &key &allow-other-keys &aux))
2847	(return-from compute-method-fast-function nil))
2848	;; Only required args.
2849	(let ((body (cddr lambda-expression))
2850	(call-next-method-p nil)
2851	(next-method-p-p nil))
2852	(multiple-value-bind (body declarations) (parse-body body)
2853	;;; N.b. The WALK-FORM check is bogus for "hidden"
2854	;;; macroizations of CALL-NEXT-METHOD and NEXT-METHOD-P but
2855	;;; the presence of FAST-FUNCTION slots in our CLOS is
2856	;;; currently necessary to bootstrap CLOS in a way I didn't
2857	;;; manage to easily untangle.
2858	(walk-form body)
2859	(when (or call-next-method-p next-method-p-p)
2860	(return-from compute-method-fast-function nil))
2861	(let ((declaration `(declare (ignorable ,@lambda-list))))
2862	;;; 2020-10-19 refactored this expression from previous code
2863	;;; that was only declaring a fast function for one or two
2864	;;; element values of lamba-list
2865	(if (< 0 (length lambda-list) 3)
2866	`(lambda ,(cadr lambda-expression)
2867	,declaration
2868	(flet ((call-next-method (&rest args)
2869	(declare (ignore args))
2870	(error "No next method for generic function"))
2871	(next-method-p () nil))
2872	(declare (ignorable (function call-next-method)
2873	(function next-method-p)))
2874	,@body))
2875	nil))))))
2876
2877
2878	(declaim (notinline make-method-lambda))
2879	(defun make-method-lambda (generic-function method lambda-expression env)
2880	(declare (ignore generic-function method env))
2881	(values (compute-method-function lambda-expression) nil))
2882
2883
2884	;; From CLHS section 7.6.5:
2885	;; "When a generic function or any of its methods mentions &key in a lambda
2886	;; list, the specific set of keyword arguments accepted by the generic function
2887	;; varies according to the applicable methods. The set of keyword arguments
2888	;; accepted by the generic function for a particular call is the union of the
2889	;; keyword arguments accepted by all applicable methods and the keyword
2890	;; arguments mentioned after &key in the generic function definition, if any."
2891	;; Adapted from Sacla.
2892	(defun allow-other-keys (lambda-list)
2893	(if (and (member '&key lambda-list)
2894	(not (member '&allow-other-keys lambda-list)))
2895	(let* ((key-end (or (position '&aux lambda-list) (length lambda-list)))
2896	(aux-part (subseq lambda-list key-end)))
2897	`(,@(subseq lambda-list 0 key-end) &allow-other-keys ,@aux-part))
2898	lambda-list))
2899
2900	(defmacro defmethod (&rest args &environment env)
2901	(multiple-value-bind
2902	(function-name qualifiers lambda-list specializers documentation declarations body)
2903	(parse-defmethod args)
2904	(let* ((specializers-form '())
2905	(lambda-expression `(lambda ,lambda-list ,@declarations ,body))
2906	(gf (or (find-generic-function function-name nil)
2907	(class-prototype (find-class 'standard-generic-function))))
2908	(method-function
2909	(make-method-lambda gf (class-prototype (generic-function-method-class gf))
2910	lambda-expression env))
2911	(fast-function (compute-method-fast-function lambda-expression))
2912	)
2913	(dolist (specializer specializers)
2914	(cond ((and (consp specializer) (eq (car specializer) 'eql))
2915	(push `(list 'eql ,(cadr specializer)) specializers-form))
2916	(t
2917	(push `',specializer specializers-form))))
2918	(setf specializers-form `(list ,@(nreverse specializers-form)))
2919	`(progn
2920	(sys::record-source-information-for-type ',function-name '(:method ,function-name ,qualifiers ,specializers))
2921	(ensure-method ',function-name
2922	:lambda-list ',lambda-list
2923	:qualifiers ',qualifiers
2924	:specializers (canonicalize-specializers ,specializers-form)
2925	,@(when documentation `(:documentation ,documentation))
2926	:function (function ,method-function)
2927	,@(when fast-function `(:fast-function (function ,fast-function)))
2928	)))))
2929
2930	;;; Reader and writer methods
2931
2932	(defun make-instance-standard-accessor-method (method-class
2933	&key
2934	lambda-list
2935	qualifiers
2936	specializers
2937	documentation
2938	function
2939	fast-function
2940	slot-definition)
2941	(let ((method (std-allocate-instance method-class)))
2942	(setf (method-lambda-list method) lambda-list)
2943	(setf (method-qualifiers method) qualifiers)
2944	(setf (std-slot-value method 'sys::specializers)
2945	(canonicalize-specializers specializers))
2946	(setf (method-documentation method) documentation)
2947	(setf (std-slot-value method 'sys::%generic-function) nil)
2948	(setf (std-slot-value method 'sys::%function) function)
2949	(setf (std-slot-value method 'sys::fast-function) fast-function)
2950	(setf (std-slot-value method 'sys::%slot-definition) slot-definition)
2951	(setf (std-slot-value method 'sys::keywords) nil)
2952	(setf (std-slot-value method 'sys::other-keywords-p) nil)
2953	method))
2954
2955	(defun add-reader-method (class function-name slot-definition)
2956	(let* ((slot-name (slot-definition-name slot-definition))
2957	(lambda-expression
2958	(if (std-class-p class)
2959	`(lambda (object) (std-slot-value object ',slot-name))
2960	`(lambda (object) (slot-value object ',slot-name))))
2961	(method-function (compute-method-function lambda-expression))
2962	(fast-function (compute-method-fast-function lambda-expression))
2963	(method-lambda-list '(object))
2964	(gf (find-generic-function function-name nil))
2965	(initargs `(:lambda-list ,method-lambda-list
2966	:qualifiers ()
2967	:specializers (,class)
2968	:function ,(if (autoloadp 'compile)
2969	method-function
2970	(autocompile method-function))
2971	:fast-function ,(if (autoloadp 'compile)
2972	fast-function
2973	(autocompile fast-function))
2974	:slot-definition ,slot-definition))
2975	(method-class (if (std-class-p class)
2976	+the-standard-reader-method-class+
2977	(apply #'reader-method-class class slot-definition
2978	initargs))))
2979	;; required by AMOP pg. 225
2980	(assert (subtypep method-class +the-standard-reader-method-class+))
2981	(if gf
2982	(check-method-lambda-list function-name
2983	method-lambda-list
2984	(generic-function-lambda-list gf))
2985	(setf gf (ensure-generic-function function-name
2986	:lambda-list method-lambda-list)))
2987	(let ((method
2988	(if (eq method-class +the-standard-reader-method-class+)
2989	(apply #'make-instance-standard-accessor-method method-class
2990	initargs)
2991	(apply #'make-instance method-class
2992	:generic-function nil ; handled by add-method
2993	initargs))))
2994	(if (std-generic-function-p gf)
2995	(progn
2996	(std-add-method gf method)
2997	(map-dependents gf
2998	#'(lambda (dep)
2999	(update-dependent gf dep 'add-method method))))
3000	(add-method gf method))
3001	method)))
3002
3003	(defun add-writer-method (class function-name slot-definition)
3004	(let* ((slot-name (slot-definition-name slot-definition))
3005	(lambda-expression
3006	(if (std-class-p class)
3007	`(lambda (new-value object)
3008	(setf (std-slot-value object ',slot-name) new-value))
3009	`(lambda (new-value object)
3010	(setf (slot-value object ',slot-name) new-value))))
3011	(method-function (compute-method-function lambda-expression))
3012	(fast-function (compute-method-fast-function lambda-expression))
3013	(method-lambda-list '(new-value object))
3014	(gf (find-generic-function function-name nil))
3015	(initargs `(:lambda-list ,method-lambda-list
3016	:qualifiers ()
3017	:specializers (,+the-T-class+ ,class)
3018	:function ,(if (autoloadp 'compile)
3019	method-function
3020	(autocompile method-function))
3021	:fast-function ,(if (autoloadp 'compile)
3022	fast-function
3023	(autocompile fast-function))
3024	:slot-definition ,slot-definition))
3025	(method-class (if (std-class-p class)
3026	+the-standard-writer-method-class+
3027	(apply #'writer-method-class class slot-definition
3028	initargs))))
3029	;; required by AMOP pg. 242
3030	(assert (subtypep method-class +the-standard-writer-method-class+))
3031	(if gf
3032	(check-method-lambda-list function-name
3033	method-lambda-list
3034	(generic-function-lambda-list gf))
3035	(setf gf (ensure-generic-function function-name
3036	:lambda-list method-lambda-list)))
3037	(let ((method
3038	(if (eq method-class +the-standard-writer-method-class+)
3039	(apply #'make-instance-standard-accessor-method method-class
3040	initargs)
3041	(apply #'make-instance method-class
3042	:generic-function nil ; handled by add-method
3043	initargs))))
3044	(if (std-generic-function-p gf)
3045	(progn
3046	(std-add-method gf method)
3047	(map-dependents gf
3048	#'(lambda (dep)
3049	(update-dependent gf dep 'add-method method))))
3050	(add-method gf method))
3051	method)))
3052
3053	(defmacro atomic-defgeneric (function-name &rest rest)
3054	"Macro to define a generic function and 'swap it into place' after
3055	it's been fully defined with all its methods.
3056
3057	Note: the user should really use the (:method ..) method description
3058	way of defining methods; there's not much use in atomically defining
3059	generic functions without providing sensible behaviour."
3060	(let ((temp-sym (gensym)))
3061	`(progn
3062	(defgeneric ,temp-sym ,@rest)
3063	(sys::record-source-information-for-type ',function-name '(:generic-function ,function-name))
3064	,@(loop for method-form in rest
3065	when (eq (car method-form) :method)
3066	collect
3067	(multiple-value-bind (function-name qualifiers lambda-list specializers documentation declarations body)
3068	(mop::parse-defmethod `(,function-name ,@(rest method-form)))
3069	`(sys::record-source-information-for-type ',function-name '(:method ,function-name ,qualifiers ,specializers))))
3070	(let ((gf (symbol-function ',temp-sym)))
3071	;; FIXME (rudi 2012-07-08): fset gets the source location info
3072	;; to charpos 23 always (but (setf fdefinition) leaves the
3073	;; outdated source position in place, which is even worse).
3074	(fset ',function-name gf)
3075	(setf (std-slot-value gf 'sys::name) ',function-name)
3076	(fmakunbound ',temp-sym)
3077	gf))))
3078
3079	(defmacro redefine-class-forwarder (name slot &optional body-alist)
3080	"Define a generic function on a temporary symbol as an accessor
3081	for the slot `slot'. Then, when definition is complete (including
3082	allocation of methods), swap the definition in place.
3083
3084	`body-alist' can be used to override the default method bodies for given
3085	metaclasses. In substitute method bodies, `class' names the class
3086	instance and, for setters, `new-value' the new value."
3087	(let* ((setterp (consp name))
3088	(%name
3089	(intern (concatenate 'string
3090	"%"
3091	(if setterp (symbol-name 'set-) "")
3092	(symbol-name (if setterp (cadr name) name)))
3093	(find-package "SYS")))
3094	(bodies
3095	(append body-alist
3096	(if setterp
3097	`((built-in-class . (,%name new-value class))
3098	(forward-referenced-class . (,%name new-value class))
3099	(structure-class . (,%name new-value class))
3100	(standard-class . (setf (slot-value class ',slot)
3101	new-value))
3102	(funcallable-standard-class . (setf (slot-value class ',slot)
3103	new-value)))
3104	`((built-in-class . (,%name class))
3105	(forward-referenced-class . (,%name class))
3106	(structure-class . (,%name class))
3107	(standard-class . (slot-value class ',slot))
3108	(funcallable-standard-class . (slot-value class ',slot)))))))
3109	`(atomic-defgeneric ,name (,@(when setterp (list 'new-value)) class)
3110	,@(mapcar #'(lambda (class-name)
3111	`(:method (,@(when setterp (list 'new-value))
3112	(class ,class-name))
3113	,(cdr (assoc class-name bodies))))
3114	'(built-in-class forward-referenced-class structure-class
3115	standard-class funcallable-standard-class)))))
3116
3117	;;; The slot names here must agree with the ones defined in
3118	;;; StandardClass.java:layoutStandardClass.
3119	(redefine-class-forwarder class-name sys:name)
3120	;;; AMOP pg. 230
3121	(redefine-class-forwarder (setf class-name) sys:name
3122	((standard-class . (progn (reinitialize-instance class :name new-value) new-value))
3123	(funcallable-standard-class . (progn (reinitialize-instance class :name new-value) new-value))))
3124	(redefine-class-forwarder class-slots sys:slots)
3125	(redefine-class-forwarder (setf class-slots) sys:slots)
3126	(redefine-class-forwarder class-direct-slots sys:direct-slots)
3127	(redefine-class-forwarder (setf class-direct-slots) sys:direct-slots)
3128	(redefine-class-forwarder class-layout sys:layout)
3129	(redefine-class-forwarder (setf class-layout) sys:layout)
3130	(redefine-class-forwarder class-direct-superclasses sys:direct-superclasses)
3131	(redefine-class-forwarder (setf class-direct-superclasses) sys:direct-superclasses)
3132	(redefine-class-forwarder class-direct-subclasses sys:direct-subclasses)
3133	(redefine-class-forwarder (setf class-direct-subclasses) sys:direct-subclasses)
3134	(redefine-class-forwarder class-direct-methods sys:direct-methods)
3135	(redefine-class-forwarder (setf class-direct-methods) sys:direct-methods)
3136	(redefine-class-forwarder class-precedence-list sys:precedence-list)
3137	(redefine-class-forwarder (setf class-precedence-list) sys:precedence-list)
3138	(redefine-class-forwarder class-finalized-p sys:finalized-p)
3139	(redefine-class-forwarder (setf class-finalized-p) sys:finalized-p)
3140	(redefine-class-forwarder class-default-initargs sys:default-initargs)
3141	(redefine-class-forwarder (setf class-default-initargs) sys:default-initargs)
3142	(redefine-class-forwarder class-direct-default-initargs sys:direct-default-initargs)
3143	(redefine-class-forwarder (setf class-direct-default-initargs) sys:direct-default-initargs)
3144
3145	;;; Class definition
3146
3147	(defun check-duplicate-slots (slots)
3148	(flet ((canonical-slot-name (canonical-slot)
3149	(getf canonical-slot :name)))
3150	(dolist (s1 slots)
3151	(let ((name1 (canonical-slot-name s1)))
3152	(dolist (s2 (cdr (memq s1 slots)))
3153	(when (eq name1 (canonical-slot-name s2))
3154	(error 'program-error "Duplicate slot ~S" name1)))))))
3155
3156	(defun check-duplicate-default-initargs (initargs)
3157	(let ((names ()))
3158	(dolist (initarg initargs)
3159	(push (car initarg) names))
3160	(do* ((names names (cdr names))
3161	(name (car names) (car names)))
3162	((null names))
3163	(when (memq name (cdr names))
3164	(error 'program-error
3165	:format-control "Duplicate initialization argument name ~S in :DEFAULT-INITARGS."
3166	:format-arguments (list name))))))
3167
3168	(defun canonicalize-direct-superclasses (direct-superclasses)
3169	(let ((classes '()))
3170	(dolist (class-specifier direct-superclasses)
3171	(let ((class (if (classp class-specifier)
3172	class-specifier
3173	(find-class class-specifier nil))))
3174	(unless class
3175	(setf class (make-instance +the-forward-referenced-class+
3176	:name class-specifier))
3177	(setf (find-class class-specifier) class))
3178	(when (and (typep class 'built-in-class)
3179	(not (member class extensible-built-in-classes)))
3180	(error "Attempt to define a subclass of built-in-class ~S."
3181	class-specifier))
3182	(push class classes)))
3183	(nreverse classes)))
3184
3185	(atomic-defgeneric add-direct-subclass (superclass subclass)
3186	(:method ((superclass class) (subclass class))
3187	(setf (class-direct-subclasses superclass)
3188	(adjoin subclass (class-direct-subclasses superclass)))))
3189
3190	(atomic-defgeneric remove-direct-subclass (superclass subclass)
3191	(:method ((superclass class) (subclass class))
3192	(setf (class-direct-subclasses superclass)
3193	(remove subclass (class-direct-subclasses superclass)))))
3194
3195	;;; AMOP pg. 182
3196	(defun ensure-class (name &rest all-keys &key &allow-other-keys)
3197	(let ((class (find-class name nil)))
3198	;; CLHS DEFCLASS: "If a class with the same proper name already
3199	;; exists [...] the existing class is redefined." Ansi-tests
3200	;; CLASS-0309 and CLASS-0310.1 demand this behavior.
3201	(if (and class (eql (class-name class) name))
3202	(apply #'ensure-class-using-class class name all-keys)
3203	(apply #'ensure-class-using-class nil name all-keys))))
3204
3205	;;; AMOP pg. 183ff.
3206	(defgeneric ensure-class-using-class (class name &key direct-default-initargs
3207	direct-slots direct-superclasses
3208	metaclass &allow-other-keys))
3209
3210	(defmethod ensure-class-using-class :before (class name &key direct-slots
3211	direct-default-initargs
3212	&allow-other-keys)
3213	(check-duplicate-slots direct-slots)
3214	(check-duplicate-default-initargs direct-default-initargs))
3215
3216	(defmethod ensure-class-using-class ((class null) name &rest all-keys
3217	&key (metaclass +the-standard-class+)
3218	direct-superclasses
3219	&allow-other-keys)
3220	(setf all-keys (copy-list all-keys)) ; since we modify it
3221	(remf all-keys :metaclass)
3222	(unless (classp metaclass) (setf metaclass (find-class metaclass)))
3223	(let ((class (apply (if (eq metaclass +the-standard-class+)
3224	#'make-instance-standard-class
3225	#'make-instance)
3226	metaclass :name name
3227	:direct-superclasses (canonicalize-direct-superclasses
3228	direct-superclasses)
3229	all-keys)))
3230	(%set-find-class name class)
3231	class))
3232
3233	(defmethod ensure-class-using-class ((class built-in-class) name &rest all-keys
3234	&key &allow-other-keys)
3235	(declare (ignore all-keys))
3236	(error "The symbol ~S names a built-in class." name))
3237
3238	(defmethod ensure-class-using-class ((class forward-referenced-class) name
3239	&rest all-keys
3240	&key (metaclass +the-standard-class+)
3241	direct-superclasses &allow-other-keys)
3242	(setf all-keys (copy-list all-keys)) ; since we modify it
3243	(remf all-keys :metaclass)
3244	(unless (classp metaclass) (setf metaclass (find-class metaclass)))
3245	(apply #'change-class class metaclass all-keys)
3246	(apply #'reinitialize-instance class
3247	:name name
3248	:direct-superclasses (canonicalize-direct-superclasses
3249	direct-superclasses)
3250	all-keys)
3251	class)
3252
3253	(defmethod ensure-class-using-class ((class class) name
3254	&rest all-keys
3255	&key (metaclass +the-standard-class+ metaclassp)
3256	direct-superclasses
3257	&allow-other-keys)
3258	(declare (ignore name))
3259	(setf all-keys (copy-list all-keys)) ; since we modify it
3260	(remf all-keys :metaclass)
3261	(unless (classp metaclass) (setf metaclass (find-class metaclass)))
3262	(when (and metaclassp (not (eq (class-of class) metaclass)))
3263	(error 'program-error
3264	"Trying to redefine class ~S with different metaclass."
3265	(class-name class)))
3266	(apply #'reinitialize-instance class
3267	:direct-superclasses (canonicalize-direct-superclasses direct-superclasses)
3268	all-keys)
3269	class)
3270
3271	(defmacro defclass (&whole form name direct-superclasses direct-slots &rest options)
3272	(unless (>= (length form) 3)
3273	(error 'program-error "Wrong number of arguments for DEFCLASS."))
3274	(check-declaration-type name)
3275	`(progn
3276	(sys::record-source-information-for-type ',name :class)
3277	(ensure-class ',name
3278	:direct-superclasses
3279	(canonicalize-direct-superclasses ',direct-superclasses)
3280	:direct-slots
3281	,(canonicalize-direct-slots direct-slots)
3282	,@(canonicalize-defclass-options options))))
3283
3284
3285	;;; AMOP pg. 180
3286	(defgeneric direct-slot-definition-class (class &rest initargs))
3287
3288	(defmethod direct-slot-definition-class ((class class) &rest initargs)
3289	(declare (ignore initargs))
3290	+the-standard-direct-slot-definition-class+)
3291
3292	;;; AMOP pg. 181
3293	(defgeneric effective-slot-definition-class (class &rest initargs))
3294
3295	(defmethod effective-slot-definition-class ((class class) &rest initargs)
3296	(declare (ignore initargs))
3297	+the-standard-effective-slot-definition-class+)
3298
3299	;;; AMOP pg. 224
3300	(defgeneric reader-method-class (class direct-slot &rest initargs))
3301
3302	(defmethod reader-method-class ((class standard-class)
3303	(direct-slot standard-direct-slot-definition)
3304	&rest initargs)
3305	(declare (ignore initargs))
3306	+the-standard-reader-method-class+)
3307
3308	(defmethod reader-method-class ((class funcallable-standard-class)
3309	(direct-slot standard-direct-slot-definition)
3310	&rest initargs)
3311	(declare (ignore initargs))
3312	+the-standard-reader-method-class+)
3313
3314	;;; AMOP pg. 242
3315	(defgeneric writer-method-class (class direct-slot &rest initargs))
3316
3317	(defmethod writer-method-class ((class standard-class)
3318	(direct-slot standard-direct-slot-definition)
3319	&rest initargs)
3320	(declare (ignore initargs))
3321	+the-standard-writer-method-class+)
3322
3323	(defmethod writer-method-class ((class funcallable-standard-class)
3324	(direct-slot standard-direct-slot-definition)
3325	&rest initargs)
3326	(declare (ignore initargs))
3327	+the-standard-writer-method-class+)
3328
3329	;;; Applicable methods
3330
3331	(atomic-defgeneric compute-applicable-methods (gf args)
3332	(:method ((gf standard-generic-function) args)
3333	(std-compute-applicable-methods gf args)))
3334
3335	(defgeneric compute-applicable-methods-using-classes (gf classes)
3336	(:method ((gf standard-generic-function) classes)
3337	(let ((methods '()))
3338	(dolist (method (generic-function-methods gf))
3339	(multiple-value-bind (applicable knownp)
3340	(method-applicable-using-classes-p method classes)
3341	(cond (applicable
3342	(push method methods))
3343	((not knownp)
3344	(return-from compute-applicable-methods-using-classes
3345	(values nil nil))))))
3346	(values (sort-methods methods gf classes)
3347	t))))
3348
3349
3350	;;; Slot access
3351	;;;
3352	;;; See AMOP pg. 156ff. for an overview.
3353	;;;
3354	;;; AMOP specifies these generic functions to dispatch on slot objects
3355	;;; (with the exception of slot-exists-p-using-class), although its
3356	;;; sample implementation Closette dispatches on slot names. We let
3357	;;; slot-value and friends call their gf counterparts with the effective
3358	;;; slot definition, but leave the definitions dispatching on slot name
3359	;;; in place for user convenience.
3360
3361	;;; AMOP pg. 235
3362	(defgeneric slot-value-using-class (class instance slot))
3363
3364	(defmethod slot-value-using-class ((class standard-class) instance (slot symbol))
3365	(std-slot-value instance slot))
3366	(defmethod slot-value-using-class ((class standard-class) instance
3367	(slot standard-effective-slot-definition))
3368	(let* ((location (slot-definition-location slot))
3369	(value (if (consp location)
3370	(cdr location) ; :allocation :class
3371	(standard-instance-access instance location))))
3372	(if (eq value +slot-unbound+)
3373	;; fix SLOT-UNBOUND.5 from ansi test suite
3374	(nth-value 0 (slot-unbound class instance (slot-definition-name slot)))
3375	value)))
3376
3377	(defmethod slot-value-using-class ((class funcallable-standard-class)
3378	instance (slot symbol))
3379	(std-slot-value instance slot))
3380	(defmethod slot-value-using-class ((class funcallable-standard-class) instance
3381	(slot standard-effective-slot-definition))
3382	(let* ((location (slot-definition-location slot))
3383	(value (if (consp location)
3384	(cdr location) ; :allocation :class
3385	(funcallable-standard-instance-access instance location))))
3386	(if (eq value +slot-unbound+)
3387	;; fix SLOT-UNBOUND.5 from ansi test suite
3388	(nth-value 0 (slot-unbound class instance (slot-definition-name slot)))
3389	value)))
3390
3391	(defmethod slot-value-using-class ((class structure-class) instance
3392	(slot symbol))
3393	(std-slot-value instance slot))
3394	(defmethod slot-value-using-class ((class structure-class) instance
3395	(slot standard-effective-slot-definition))
3396	(std-slot-value instance (slot-definition-name slot)))
3397
3398	;;; AMOP pg. 231
3399	(defgeneric (setf slot-value-using-class) (new-value class instance slot))
3400
3401	(defmethod (setf slot-value-using-class) (new-value
3402	(class standard-class)
3403	instance
3404	(slot symbol))
3405	(setf (std-slot-value instance slot) new-value))
3406	(defmethod (setf slot-value-using-class) (new-value
3407	(class standard-class)
3408	instance
3409	(slot standard-effective-slot-definition))
3410	(let ((location (slot-definition-location slot)))
3411	(if (consp location) ; :allocation :class
3412	(setf (cdr location) new-value)
3413	(setf (standard-instance-access instance location) new-value))))
3414
3415	(defmethod (setf slot-value-using-class) (new-value
3416	(class funcallable-standard-class)
3417	instance
3418	(slot symbol))
3419	(setf (std-slot-value instance slot) new-value))
3420	(defmethod (setf slot-value-using-class) (new-value
3421	(class funcallable-standard-class)
3422	instance
3423	(slot standard-effective-slot-definition))
3424	(let ((location (slot-definition-location slot)))
3425	(if (consp location) ; :allocation :class
3426	(setf (cdr location) new-value)
3427	(setf (funcallable-standard-instance-access instance location)
3428	new-value))))
3429
3430	(defmethod (setf slot-value-using-class) (new-value
3431	(class structure-class)
3432	instance
3433	(slot symbol))
3434	(setf (std-slot-value instance slot) new-value))
3435	(defmethod (setf slot-value-using-class) (new-value
3436	(class structure-class)
3437	instance
3438	(slot standard-effective-slot-definition))
3439	(setf (std-slot-value instance (slot-definition-name slot)) new-value))
3440
3441	;;; slot-exists-p-using-class is not specified by AMOP, and obviously
3442	;;; cannot be specialized on the slot type. Hence, its implementation
3443	;;; differs from slot-(boundp\|makunbound\|value)-using-class
3444	(defgeneric slot-exists-p-using-class (class instance slot-name))
3445
3446	(defmethod slot-exists-p-using-class (class instance slot-name)
3447	nil)
3448
3449	(defmethod slot-exists-p-using-class ((class standard-class) instance slot-name)
3450	(std-slot-exists-p instance slot-name))
3451	(defmethod slot-exists-p-using-class ((class funcallable-standard-class) instance slot-name)
3452	(std-slot-exists-p instance slot-name))
3453
3454	(defmethod slot-exists-p-using-class ((class structure-class) instance slot-name)
3455	(dolist (dsd (class-slots class))
3456	(when (eq (sys::dsd-name dsd) slot-name)
3457	(return-from slot-exists-p-using-class t)))
3458	nil)
3459
3460
3461	(defgeneric slot-boundp-using-class (class instance slot))
3462	(defmethod slot-boundp-using-class ((class standard-class) instance (slot symbol))
3463	(std-slot-boundp instance slot))
3464	(defmethod slot-boundp-using-class ((class standard-class) instance
3465	(slot standard-effective-slot-definition))
3466	(let ((location (slot-definition-location slot)))
3467	(if (consp location)
3468	(not (eq (cdr location) +slot-unbound+)) ; :allocation :class
3469	(not (eq (standard-instance-access instance location) +slot-unbound+)))))
3470
3471	(defmethod slot-boundp-using-class ((class funcallable-standard-class) instance
3472	(slot symbol))
3473	(std-slot-boundp instance slot))
3474	(defmethod slot-boundp-using-class ((class funcallable-standard-class) instance
3475	(slot standard-effective-slot-definition))
3476	(let ((location (slot-definition-location slot)))
3477	(if (consp location)
3478	(not (eq (cdr location) +slot-unbound+)) ; :allocation :class
3479	(not (eq (funcallable-standard-instance-access instance location)
3480	+slot-unbound+)))))
3481
3482	(defmethod slot-boundp-using-class ((class structure-class) instance slot)
3483	"Structure slots can't be unbound, so this method always returns T."
3484	(declare (ignore class instance slot))
3485	t)
3486
3487	(defgeneric slot-makunbound-using-class (class instance slot))
3488	(defmethod slot-makunbound-using-class ((class standard-class)
3489	instance
3490	(slot symbol))
3491	(std-slot-makunbound instance slot))
3492	(defmethod slot-makunbound-using-class ((class standard-class)
3493	instance
3494	(slot standard-effective-slot-definition))
3495	(let ((location (slot-definition-location slot)))
3496	(if (consp location)
3497	(setf (cdr location) +slot-unbound+)
3498	(setf (standard-instance-access instance location) +slot-unbound+))))
3499
3500	(defmethod slot-makunbound-using-class ((class funcallable-standard-class)
3501	instance
3502	(slot symbol))
3503	(std-slot-makunbound instance slot))
3504	(defmethod slot-makunbound-using-class ((class funcallable-standard-class)
3505	instance
3506	(slot symbol))
3507	(let ((location (slot-definition-location slot)))
3508	(if (consp location)
3509	(setf (cdr location) +slot-unbound+)
3510	(setf (funcallable-standard-instance-access instance location)
3511	+slot-unbound+))))
3512
3513	(defmethod slot-makunbound-using-class ((class structure-class)
3514	instance
3515	slot)
3516	(declare (ignore class instance slot))
3517	(error "Structure slots can't be unbound"))
3518
3519	(defgeneric slot-missing (class instance slot-name operation &optional new-value))
3520
3521	(defmethod slot-missing ((class t) instance slot-name operation &optional new-value)
3522	(declare (ignore new-value))
3523	(error "The slot ~S is missing from the class ~S." slot-name class))
3524
3525	(defgeneric slot-unbound (class instance slot-name))
3526
3527	(defmethod slot-unbound ((class t) instance slot-name)
3528	(error 'unbound-slot :instance instance :name slot-name))
3529
3530	;;; Instance creation and initialization
3531
3532	;;; AMOP pg. 168ff.
3533	(defgeneric allocate-instance (class &rest initargs &key &allow-other-keys))
3534
3535	(defmethod allocate-instance ((class standard-class) &rest initargs)
3536	(declare (ignore initargs))
3537	(std-allocate-instance class))
3538
3539	(defmethod allocate-instance ((class funcallable-standard-class) &rest initargs)
3540	(declare (ignore initargs))
3541	(allocate-funcallable-instance class))
3542
3543	(defmethod allocate-instance ((class structure-class) &rest initargs)
3544	(declare (ignore initargs))
3545	(%make-structure (class-name class)
3546	(make-list (length (class-slots class))
3547	:initial-element +slot-unbound+)))
3548
3549	(defmethod allocate-instance ((class built-in-class) &rest initargs)
3550	(declare (ignore initargs))
3551	(error "Cannot allocate instances of a built-in class: ~S" class))
3552
3553	(defmethod allocate-instance :before ((class class) &rest initargs)
3554	(declare (ignore initargs))
3555	(unless (class-finalized-p class)
3556	(finalize-inheritance class)))
3557
3558	;; "The set of valid initialization arguments for a class is the set of valid
3559	;; initialization arguments that either fill slots or supply arguments to
3560	;; methods, along with the predefined initialization argument :ALLOW-OTHER-KEYS."
3561	;; 7.1.2
3562
3563	(defun calculate-allowable-initargs (gf-list args instance
3564	shared-initialize-param
3565	initargs)
3566	(let* ((methods
3567	(nconc
3568	(std-compute-applicable-methods #'shared-initialize
3569	(list* instance
3570	shared-initialize-param
3571	initargs))
3572	(mapcan #'(lambda (gf)
3573	(if (std-generic-function-p gf)
3574	(std-compute-applicable-methods gf args)
3575	(compute-applicable-methods gf args)))
3576	gf-list)))
3577	(method-keyword-args
3578	(reduce #'merge-initargs-sets
3579	(mapcar #'method-lambda-list methods)
3580	:key #'extract-lambda-list-keywords
3581	:initial-value nil))
3582	(slots-initargs
3583	(mapappend #'slot-definition-initargs
3584	(class-slots (class-of instance)))))
3585	(merge-initargs-sets
3586	(merge-initargs-sets slots-initargs method-keyword-args)
3587	'(:allow-other-keys)))) ;; allow-other-keys is always allowed
3588
3589	(defun check-initargs (gf-list args instance
3590	shared-initialize-param initargs
3591	cache call-site)
3592	"Checks the validity of `initargs' for the generic functions in `gf-list'
3593	when called with `args' by calculating the applicable methods for each gf.
3594	The applicable methods for SHARED-INITIALIZE based on `instance',
3595	`shared-initialize-param' and `initargs' are added to the list of
3596	applicable methods."
3597	(when (oddp (length initargs))
3598	(error 'program-error
3599	:format-control "Odd number of keyword arguments."))
3600	(unless (getf initargs :allow-other-keys)
3601	(multiple-value-bind (allowable-initargs present-p)
3602	(when cache
3603	(gethash (class-of instance) cache))
3604	(unless present-p
3605	(setf allowable-initargs
3606	(calculate-allowable-initargs gf-list args instance
3607	shared-initialize-param initargs))
3608	(when cache
3609	(setf (gethash (class-of instance) cache)
3610	allowable-initargs)))
3611	(unless (eq t allowable-initargs)
3612	(do* ((tail initargs (cddr tail))
3613	(initarg (car tail) (car tail)))
3614	((null tail))
3615	(unless (memq initarg allowable-initargs)
3616	(error 'program-error
3617	:format-control "Invalid initarg ~S in call to ~S with arglist ~S."
3618	:format-arguments (list initarg call-site args))))))))
3619
3620	(defun merge-initargs-sets (list1 list2)
3621	(cond
3622	((eq list1 t) t)
3623	((eq list2 t) t)
3624	(t (union list1 list2))))
3625
3626	(defun extract-lambda-list-keywords (lambda-list)
3627	"Returns a list of keywords acceptable as keyword arguments,
3628	or T when any keyword is acceptable due to presence of
3629	&allow-other-keys."
3630	(when (member '&allow-other-keys lambda-list)
3631	(return-from extract-lambda-list-keywords t))
3632	(loop with keyword-args = (cdr (memq '&key lambda-list))
3633	for key in keyword-args
3634	when (eq key '&aux) do (loop-finish)
3635	when (eq key '&allow-other-keys) do (return t)
3636	when (listp key) do (setq key (car key))
3637	collect (if (symbolp key)
3638	(make-keyword key)
3639	(car key))))
3640
3641
3642	(defgeneric make-instance (class &rest initargs &key &allow-other-keys))
3643
3644	(defmethod make-instance :before ((class class) &rest initargs)
3645	(when (oddp (length initargs))
3646	(error 'program-error :format-control "Odd number of keyword arguments."))
3647	(unless (class-finalized-p class)
3648	(finalize-inheritance class)))
3649
3650	(defun augment-initargs-with-defaults (class initargs)
3651	(let ((default-initargs '()))
3652	(dolist (initarg (class-default-initargs class))
3653	(let ((key (first initarg))
3654	(fn (third initarg)))
3655	(when (eq (getf initargs key +slot-unbound+) +slot-unbound+)
3656	(push key default-initargs)
3657	(push (funcall fn) default-initargs))))
3658	(append initargs (nreverse default-initargs))))
3659
3660	(defmethod make-instance ((class standard-class) &rest initargs)
3661	(setf initargs (augment-initargs-with-defaults class initargs))
3662	(let ((instance (std-allocate-instance class)))
3663	(check-initargs (list #'allocate-instance #'initialize-instance)
3664	(list* instance initargs)
3665	instance t initargs
3666	make-instance-initargs-cache 'make-instance)
3667	(apply #'initialize-instance instance initargs)
3668	instance))
3669
3670	(defmethod make-instance ((class funcallable-standard-class) &rest initargs)
3671	(setf initargs (augment-initargs-with-defaults class initargs))
3672	(let ((instance (allocate-funcallable-instance class)))
3673	(check-initargs (list #'allocate-instance #'initialize-instance)
3674	(list* instance initargs)
3675	instance t initargs
3676	make-instance-initargs-cache 'make-instance)
3677	(apply #'initialize-instance instance initargs)
3678	instance))
3679
3680	(defmethod make-instance ((class symbol) &rest initargs)
3681	(apply #'make-instance (find-class class) initargs))
3682
3683	(defgeneric initialize-instance (instance &rest initargs
3684	&key &allow-other-keys))
3685
3686	(defmethod initialize-instance ((instance standard-object) &rest initargs)
3687	(apply #'shared-initialize instance t initargs))
3688
3689	(defgeneric reinitialize-instance (instance &rest initargs
3690	&key &allow-other-keys))
3691
3692	;; "The system-supplied primary method for REINITIALIZE-INSTANCE checks the
3693	;; validity of initargs and signals an error if an initarg is supplied that is
3694	;; not declared as valid. The method then calls the generic function SHARED-
3695	;; INITIALIZE with the following arguments: the instance, nil (which means no
3696	;; slots should be initialized according to their initforms), and the initargs
3697	;; it received."
3698	(defmethod reinitialize-instance ((instance standard-object) &rest initargs)
3699	(check-initargs (list #'reinitialize-instance) (list* instance initargs)
3700	instance () initargs
3701	reinitialize-instance-initargs-cache 'reinitialize-instance)
3702	(apply #'shared-initialize instance () initargs))
3703
3704	(defun std-shared-initialize (instance slot-names all-keys)
3705	(when (oddp (length all-keys))
3706	(error 'program-error :format-control "Odd number of keyword arguments."))
3707	;; do a quick scan of the arguments list to see if it's a real
3708	;; 'initialization argument list' (which is not the same as
3709	;; checking initarg validity
3710	(do* ((tail all-keys (cddr tail))
3711	(initarg (car tail) (car tail)))
3712	((null tail))
3713	(unless (symbolp initarg)
3714	(error 'program-error
3715	:format-control "Initarg ~S not a symbol."
3716	:format-arguments (list initarg))))
3717	(dolist (slot (class-slots (class-of instance)))
3718	(let ((slot-name (slot-definition-name slot)))
3719	(multiple-value-bind (init-key init-value foundp)
3720	(get-properties all-keys (slot-definition-initargs slot))
3721	(if foundp
3722	(setf (slot-value instance slot-name) init-value)
3723	(unless (slot-boundp instance slot-name)
3724	(let ((initfunction (slot-definition-initfunction slot)))
3725	(when (and initfunction (or (eq slot-names t)
3726	(memq slot-name slot-names)))
3727	(setf (slot-value instance slot-name)
3728	(funcall initfunction)))))))))
3729	instance)
3730
3731	(defgeneric shared-initialize (instance slot-names
3732	&rest initargs
3733	&key &allow-other-keys))
3734
3735	(defmethod shared-initialize ((instance standard-object) slot-names
3736	&rest initargs)
3737	(std-shared-initialize instance slot-names initargs))
3738
3739	(defmethod shared-initialize ((slot slot-definition) slot-names
3740	&rest args
3741	&key name initargs initform initfunction
3742	readers writers allocation
3743	&allow-other-keys)
3744	;;Keyword args are duplicated from init-slot-definition only to have
3745	;;them checked.
3746	(declare (ignore slot-names)) ;;TODO?
3747	(declare (ignore name initargs initform initfunction readers writers allocation))
3748	;;For built-in slots
3749	(apply #'init-slot-definition slot :allow-other-keys t args)
3750	;;For user-defined slots
3751	(call-next-method))
3752
3753	;;; change-class
3754
3755	(defgeneric change-class (instance new-class &key &allow-other-keys))
3756
3757	(defmethod change-class ((old-instance standard-object) (new-class standard-class)
3758	&rest initargs)
3759	(let ((old-slots (class-slots (class-of old-instance)))
3760	(new-slots (class-slots new-class))
3761	(new-instance (allocate-instance new-class)))
3762	;; "The values of local slots specified by both the class CTO and the class
3763	;; CFROM are retained. If such a local slot was unbound, it remains
3764	;; unbound."
3765	(dolist (new-slot new-slots)
3766	(when (instance-slot-p new-slot)
3767	(let* ((slot-name (slot-definition-name new-slot))
3768	(old-slot (find slot-name old-slots :key 'slot-definition-name)))
3769	;; "The values of slots specified as shared in the class CFROM and as
3770	;; local in the class CTO are retained."
3771	(when (and old-slot (slot-boundp old-instance slot-name))
3772	(setf (slot-value new-instance slot-name)
3773	(slot-value old-instance slot-name))))))
3774	(swap-slots old-instance new-instance)
3775	(rotatef (std-instance-layout new-instance)
3776	(std-instance-layout old-instance))
3777	(apply #'update-instance-for-different-class
3778	new-instance old-instance initargs)
3779	old-instance))
3780
3781	(defmethod change-class ((instance standard-object) (new-class symbol) &rest initargs)
3782	(apply #'change-class instance (find-class new-class) initargs))
3783
3784	(defgeneric update-instance-for-different-class (old new
3785	&rest initargs
3786	&key &allow-other-keys))
3787
3788	(defmethod update-instance-for-different-class
3789	((old standard-object) (new standard-object) &rest initargs)
3790	(let ((added-slots
3791	(remove-if #'(lambda (slot-name)
3792	(slot-exists-p old slot-name))
3793	(mapcar 'slot-definition-name
3794	(class-slots (class-of new))))))
3795	(check-initargs (list #'update-instance-for-different-class)
3796	(list old new initargs)
3797	new added-slots initargs
3798	nil 'update-instance-for-different-class)
3799	(apply #'shared-initialize new added-slots initargs)))
3800
3801	;;; make-instances-obsolete
3802
3803	(defgeneric make-instances-obsolete (class))
3804
3805	(defmethod make-instances-obsolete ((class standard-class))
3806	(%make-instances-obsolete class))
3807	(defmethod make-instances-obsolete ((class funcallable-standard-class))
3808	(%make-instances-obsolete class))
3809	(defmethod make-instances-obsolete ((class symbol))
3810	(make-instances-obsolete (find-class class))
3811	class)
3812
3813	;;; update-instance-for-redefined-class
3814
3815	(defgeneric update-instance-for-redefined-class (instance
3816	added-slots
3817	discarded-slots
3818	property-list
3819	&rest initargs
3820	&key
3821	&allow-other-keys))
3822
3823	(defmethod update-instance-for-redefined-class ((instance standard-object)
3824	added-slots
3825	discarded-slots
3826	property-list
3827	&rest initargs)
3828	(check-initargs (list #'update-instance-for-redefined-class)
3829	(list* instance added-slots discarded-slots
3830	property-list initargs)
3831	instance added-slots initargs
3832	nil 'update-instance-for-redefined-class)
3833	(apply #'shared-initialize instance added-slots initargs))
3834
3835	;;; Methods having to do with class metaobjects.
3836
3837	(defmethod initialize-instance :after ((class standard-class) &rest args)
3838	(apply #'std-after-initialization-for-classes class args))
3839
3840	(defmethod initialize-instance :after ((class funcallable-standard-class)
3841	&rest args)
3842	(apply #'std-after-initialization-for-classes class args))
3843
3844	(defmethod reinitialize-instance :before ((class standard-class)
3845	&rest all-keys
3846	&key direct-superclasses)
3847	(check-initargs (list #'allocate-instance
3848	#'initialize-instance)
3849	(list* class all-keys)
3850	class t all-keys
3851	nil 'reinitialize-instance)
3852	(dolist (superclass (set-difference (class-direct-superclasses class)
3853	direct-superclasses))
3854	(remove-direct-subclass superclass class))
3855	(dolist (superclass (set-difference direct-superclasses
3856	(class-direct-superclasses class)))
3857	(add-direct-subclass superclass class)))
3858
3859	(defmethod reinitialize-instance :before ((class funcallable-standard-class)
3860	&rest all-keys
3861	&key direct-superclasses)
3862	(check-initargs (list #'allocate-instance
3863	#'initialize-instance)
3864	(list* class all-keys)
3865	class t all-keys
3866	nil 'reinitialize-instance)
3867	(dolist (superclass (set-difference (class-direct-superclasses class)
3868	direct-superclasses))
3869	(remove-direct-subclass superclass class))
3870	(dolist (superclass (set-difference direct-superclasses
3871	(class-direct-superclasses class)))
3872	(add-direct-subclass superclass class)))
3873
3874	(defun std-after-reinitialization-for-classes (class
3875	&rest all-keys
3876	&key (direct-superclasses nil direct-superclasses-p)
3877	(direct-slots nil direct-slots-p)
3878	(direct-default-initargs nil direct-default-initargs-p)
3879	&allow-other-keys)
3880	(remhash class make-instance-initargs-cache)
3881	(remhash class reinitialize-instance-initargs-cache)
3882	(%make-instances-obsolete class)
3883	(setf (class-finalized-p class) nil)
3884	(when direct-superclasses-p
3885	(let* ((old-supers (class-direct-superclasses class))
3886	(new-supers (canonicalize-direct-superclass-list
3887	class direct-superclasses)))
3888	(setf (class-direct-superclasses class) new-supers)
3889	(dolist (old-superclass (set-difference old-supers new-supers))
3890	(remove-direct-subclass old-superclass class))
3891	(dolist (new-superclass (set-difference new-supers old-supers))
3892	(add-direct-subclass new-superclass class))))
3893	(when direct-slots-p
3894	;; FIXME: maybe remove old reader and writer methods?
3895	(let ((slots (mapcar #'(lambda (slot-properties)
3896	(apply #'make-direct-slot-definition class slot-properties))
3897	direct-slots)))
3898	(setf (class-direct-slots class) slots)
3899	(dolist (direct-slot slots)
3900	(dolist (reader (slot-definition-readers direct-slot))
3901	(add-reader-method class reader direct-slot))
3902	(dolist (writer (slot-definition-writers direct-slot))
3903	(add-writer-method class writer direct-slot)))))
3904	(when direct-default-initargs-p
3905	(setf (class-direct-default-initargs class) direct-default-initargs))
3906	(maybe-finalize-class-subtree class)
3907	(map-dependents class #'(lambda (dep) (update-dependent class dep all-keys))))
3908
3909	(defmethod reinitialize-instance :after ((class standard-class)
3910	&rest all-keys)
3911	(apply #'std-after-reinitialization-for-classes class all-keys))
3912
3913	(defmethod reinitialize-instance :after ((class funcallable-standard-class)
3914	&rest all-keys)
3915	(apply #'std-after-reinitialization-for-classes class all-keys))
3916
3917	(defmethod reinitialize-instance :before ((gf standard-generic-function)
3918	&key
3919	(lambda-list nil lambda-list-supplied-p)
3920	&allow-other-keys)
3921	(when lambda-list-supplied-p
3922	(unless (or (null (generic-function-methods gf))
3923	(lambda-lists-congruent-p lambda-list
3924	(generic-function-lambda-list gf)))
3925	(error "The lambda list ~S is incompatible with the existing methods of ~S."
3926	lambda-list gf))))
3927
3928	(defmethod reinitialize-instance :after ((gf standard-generic-function)
3929	&rest all-keys)
3930	(map-dependents gf #'(lambda (dep) (update-dependent gf dep all-keys))))
3931
3932	;;; Finalize inheritance
3933
3934	(atomic-defgeneric finalize-inheritance (class)
3935	(:method ((class standard-class))
3936	(std-finalize-inheritance class))
3937	(:method ((class funcallable-standard-class))
3938	(std-finalize-inheritance class)))
3939
3940	;;; Default initargs
3941
3942	;;; AMOP pg. 174
3943	(atomic-defgeneric compute-default-initargs (class)
3944	(:method ((class standard-class))
3945	(std-compute-default-initargs class))
3946	(:method ((class funcallable-standard-class))
3947	(std-compute-default-initargs class)))
3948
3949	;;; Class precedence lists
3950
3951	(defgeneric compute-class-precedence-list (class))
3952	(defmethod compute-class-precedence-list ((class standard-class))
3953	(std-compute-class-precedence-list class))
3954	(defmethod compute-class-precedence-list ((class funcallable-standard-class))
3955	(std-compute-class-precedence-list class))
3956
3957	;;; Slot inheritance
3958
3959	(defgeneric compute-slots (class))
3960	(defmethod compute-slots ((class standard-class))
3961	(std-compute-slots class))
3962	(defmethod compute-slots ((class funcallable-standard-class))
3963	(std-compute-slots class))
3964
3965	(defgeneric compute-effective-slot-definition (class name direct-slots))
3966	(defmethod compute-effective-slot-definition
3967	((class standard-class) name direct-slots)
3968	(std-compute-effective-slot-definition class name direct-slots))
3969	(defmethod compute-effective-slot-definition
3970	((class funcallable-standard-class) name direct-slots)
3971	(std-compute-effective-slot-definition class name direct-slots))
3972
3973	;;; Methods having to do with generic function invocation.
3974
3975	(defgeneric compute-discriminating-function (gf))
3976	(defmethod compute-discriminating-function ((gf standard-generic-function))
3977	(std-compute-discriminating-function gf))
3978
3979	(defgeneric method-more-specific-p (gf method1 method2 required-classes))
3980
3981	(defmethod method-more-specific-p ((gf standard-generic-function)
3982	method1 method2 required-classes)
3983	(let ((method-indices
3984	(argument-precedence-order-indices
3985	(generic-function-argument-precedence-order gf)
3986	(getf (analyze-lambda-list (generic-function-lambda-list gf))
3987	':required-args))))
3988	(std-method-more-specific-p method1 method2 required-classes method-indices)))
3989
3990	;;; AMOP pg. 176
3991	(defgeneric compute-effective-method (gf method-combination methods))
3992	(defmethod compute-effective-method ((gf standard-generic-function) method-combination methods)
3993	(std-compute-effective-method gf method-combination methods))
3994
3995	(defgeneric compute-applicable-methods (gf args))
3996	(defmethod compute-applicable-methods ((gf standard-generic-function) args)
3997	(std-compute-applicable-methods gf args))
3998
3999	;;; AMOP pg. 207
4000	(atomic-defgeneric make-method-lambda (generic-function method lambda-expression environment)
4001	(:method ((generic-function standard-generic-function)
4002	(method standard-method)
4003	lambda-expression environment)
4004	(declare (ignore environment))
4005	(values (compute-method-function lambda-expression) nil)))
4006
4007
4008	;;; Slot definition accessors
4009
4010	(defmacro slot-definition-dispatch (slot-definition std-form generic-form)
4011	`(let (($cl (class-of ,slot-definition)))
4012	(case $cl
4013	((+the-standard-slot-definition-class+
4014	+the-standard-direct-slot-definition-class+
4015	+the-standard-effective-slot-definition-class+)
4016	,std-form)
4017	(t ,generic-form))))
4018
4019	(atomic-defgeneric slot-definition-allocation (slot-definition)
4020	(:method ((slot-definition slot-definition))
4021	(slot-definition-dispatch slot-definition
4022	(std-slot-value slot-definition 'sys::allocation)
4023	(slot-value slot-definition 'sys::allocation))))
4024
4025	(atomic-defgeneric (setf slot-definition-allocation) (value slot-definition)
4026	(:method (value (slot-definition slot-definition))
4027	(slot-definition-dispatch slot-definition
4028	(setf (std-slot-value slot-definition 'sys::allocation) value)
4029	(setf (slot-value slot-definition 'sys::allocation) value))))
4030
4031	(atomic-defgeneric slot-definition-initargs (slot-definition)
4032	(:method ((slot-definition slot-definition))
4033	(slot-definition-dispatch slot-definition
4034	(std-slot-value slot-definition 'sys::initargs)
4035	(slot-value slot-definition 'sys::initargs))))
4036
4037	(atomic-defgeneric (setf slot-definition-initargs) (value slot-definition)
4038	(:method (value (slot-definition slot-definition))
4039	(slot-definition-dispatch slot-definition
4040	(setf (std-slot-value slot-definition 'sys::initargs) value)
4041	(setf (slot-value slot-definition 'sys::initargs) value))))
4042
4043	(atomic-defgeneric slot-definition-initform (slot-definition)
4044	(:method ((slot-definition slot-definition))
4045	(slot-definition-dispatch slot-definition
4046	(std-slot-value slot-definition 'sys::initform)
4047	(slot-value slot-definition 'sys::initform))))
4048
4049	(atomic-defgeneric (setf slot-definition-initform) (value slot-definition)
4050	(:method (value (slot-definition slot-definition))
4051	(slot-definition-dispatch slot-definition
4052	(setf (std-slot-value slot-definition 'sys::initform) value)
4053	(setf (slot-value slot-definition 'sys::initform) value))))
4054
4055	(atomic-defgeneric slot-definition-initfunction (slot-definition)
4056	(:method ((slot-definition slot-definition))
4057	(slot-definition-dispatch slot-definition
4058	(std-slot-value slot-definition 'sys::initfunction)
4059	(slot-value slot-definition 'sys::initfunction))))
4060
4061	(atomic-defgeneric (setf slot-definition-initfunction) (value slot-definition)
4062	(:method (value (slot-definition slot-definition))
4063	(slot-definition-dispatch slot-definition
4064	(setf (std-slot-value slot-definition 'sys::initfunction) value)
4065	(setf (slot-value slot-definition 'sys::initfunction) value))))
4066
4067	(atomic-defgeneric slot-definition-name (slot-definition)
4068	(:method ((slot-definition slot-definition))
4069	(slot-definition-dispatch slot-definition
4070	(std-slot-value slot-definition 'sys:name)
4071	(slot-value slot-definition 'sys:name))))
4072
4073	(atomic-defgeneric (setf slot-definition-name) (value slot-definition)
4074	(:method (value (slot-definition slot-definition))
4075	(slot-definition-dispatch slot-definition
4076	(setf (std-slot-value slot-definition 'sys:name) value)
4077	(setf (slot-value slot-definition 'sys:name) value))))
4078
4079	(atomic-defgeneric slot-definition-readers (slot-definition)
4080	(:method ((slot-definition slot-definition))
4081	(slot-definition-dispatch slot-definition
4082	(std-slot-value slot-definition 'sys::readers)
4083	(slot-value slot-definition 'sys::readers))))
4084
4085	(atomic-defgeneric (setf slot-definition-readers) (value slot-definition)
4086	(:method (value (slot-definition slot-definition))
4087	(slot-definition-dispatch slot-definition
4088	(setf (std-slot-value slot-definition 'sys::readers) value)
4089	(setf (slot-value slot-definition 'sys::readers) value))))
4090
4091	(atomic-defgeneric slot-definition-writers (slot-definition)
4092	(:method ((slot-definition slot-definition))
4093	(slot-definition-dispatch slot-definition
4094	(std-slot-value slot-definition 'sys::writers)
4095	(slot-value slot-definition 'sys::writers))))
4096
4097	(atomic-defgeneric (setf slot-definition-writers) (value slot-definition)
4098	(:method (value (slot-definition slot-definition))
4099	(slot-definition-dispatch slot-definition
4100	(setf (std-slot-value slot-definition 'sys::writers) value)
4101	(setf (slot-value slot-definition 'sys::writers) value))))
4102
4103	(atomic-defgeneric slot-definition-allocation-class (slot-definition)
4104	(:method ((slot-definition slot-definition))
4105	(slot-definition-dispatch slot-definition
4106	(std-slot-value slot-definition 'sys::allocation-class)
4107	(slot-value slot-definition 'sys::allocation-class))))
4108
4109	(atomic-defgeneric (setf slot-definition-allocation-class)
4110	(value slot-definition)
4111	(:method (value (slot-definition slot-definition))
4112	(slot-definition-dispatch slot-definition
4113	(setf (std-slot-value slot-definition 'sys::allocation-class) value)
4114	(setf (slot-value slot-definition 'sys::allocation-class) value))))
4115
4116	(atomic-defgeneric slot-definition-location (slot-definition)
4117	(:method ((slot-definition slot-definition))
4118	(slot-definition-dispatch slot-definition
4119	(std-slot-value slot-definition 'sys::location)
4120	(slot-value slot-definition 'sys::location))))
4121
4122	(atomic-defgeneric (setf slot-definition-location) (value slot-definition)
4123	(:method (value (slot-definition slot-definition))
4124	(slot-definition-dispatch slot-definition
4125	(setf (std-slot-value slot-definition 'sys::location) value)
4126	(setf (slot-value slot-definition 'sys::location) value))))
4127
4128	(atomic-defgeneric slot-definition-type (slot-definition)
4129	(:method ((slot-definition slot-definition))
4130	(slot-definition-dispatch slot-definition
4131	(std-slot-value slot-definition 'sys::%type)
4132	(slot-value slot-definition 'sys::%type))))
4133
4134	(atomic-defgeneric (setf slot-definition-type) (value slot-definition)
4135	(:method (value (slot-definition slot-definition))
4136	(slot-definition-dispatch slot-definition
4137	(setf (std-slot-value slot-definition 'sys::%type) value)
4138	(setf (slot-value slot-definition 'sys::%type) value))))
4139
4140	(atomic-defgeneric slot-definition-documentation (slot-definition)
4141	(:method ((slot-definition slot-definition))
4142	(slot-definition-dispatch slot-definition
4143	(std-slot-value slot-definition 'sys:%documentation)
4144	(slot-value slot-definition 'sys:%documentation))))
4145
4146	(atomic-defgeneric (setf slot-definition-documentation) (value slot-definition)
4147	(:method (value (slot-definition slot-definition))
4148	(slot-definition-dispatch slot-definition
4149	(setf (std-slot-value slot-definition 'sys:%documentation) value)
4150	(setf (slot-value slot-definition 'sys:%documentation) value))))
4151
4152
4153	;;; Conditions.
4154
4155	(defmacro define-condition (name (&rest parent-types) (&rest slot-specs) &body options)
4156	(let ((parent-types (or parent-types '(condition)))
4157	(report nil))
4158	(dolist (option options)
4159	(when (eq (car option) :report)
4160	(setf report (cadr option))
4161	(setf options (delete option options :test #'equal))
4162	(return)))
4163	(typecase report
4164	(null
4165	`(progn
4166	(sys::record-source-information-for-type ',name :condition)
4167	(defclass ,name ,parent-types ,slot-specs ,@options)
4168	',name))
4169	(string
4170	`(progn
4171	(sys::record-source-information-for-type ',name :condition)
4172	(defclass ,name ,parent-types ,slot-specs ,@options)
4173	(defmethod print-object ((condition ,name) stream)
4174	(if print-escape
4175	(call-next-method)
4176	(progn (write-string ,report stream) condition)))
4177	',name))
4178	(t
4179	`(progn
4180	(sys::record-source-information-for-type ',name :condition)
4181	(defclass ,name ,parent-types ,slot-specs ,@options)
4182	(defmethod print-object ((condition ,name) stream)
4183	(if print-escape
4184	(call-next-method)
4185	(funcall #',report condition stream)))
4186	',name)))))
4187
4188	(defun make-condition (type &rest initargs)
4189	(or (%make-condition type initargs)
4190	(let ((class (if (symbolp type) (find-class type) type)))
4191	(apply #'make-instance class initargs))))
4192
4193	;; Adapted from SBCL.
4194	;; Originally defined in signal.lisp. Redefined here now that we have MAKE-CONDITION.
4195	(defun coerce-to-condition (datum arguments default-type fun-name)
4196	(cond ((typep datum 'condition)
4197	(when arguments
4198	(error 'simple-type-error
4199	:datum arguments
4200	:expected-type 'null
4201	:format-control "You may not supply additional arguments when giving ~S to ~S."
4202	:format-arguments (list datum fun-name)))
4203	datum)
4204	((symbolp datum)
4205	(apply #'make-condition datum arguments))
4206	((or (stringp datum) (functionp datum))
4207	(make-condition default-type
4208	:format-control datum
4209	:format-arguments arguments))
4210	(t
4211	(error 'simple-type-error
4212	:datum datum
4213	:expected-type '(or symbol string)
4214	:format-control "Bad argument to ~S: ~S."
4215	:format-arguments (list fun-name datum)))))
4216
4217	(defgeneric make-load-form (object &optional environment))
4218
4219	(defmethod make-load-form ((object t) &optional environment)
4220	(declare (ignore environment))
4221	(apply #'no-applicable-method #'make-load-form (list object)))
4222
4223	(defmethod make-load-form ((class class) &optional environment)
4224	(declare (ignore environment))
4225	(let ((name (class-name class)))
4226	(unless (and name (eq (find-class name nil) class))
4227	(error 'simple-type-error
4228	:format-control "Can't use anonymous or undefined class as a constant: ~S."
4229	:format-arguments (list class)))
4230	`(find-class ',name)))
4231
4232	(defun invalid-method-error (method format-control &rest args)
4233	(let ((message (apply #'format nil format-control args)))
4234	(error "Invalid method error for ~S:~% ~A" method message)))
4235
4236	(defun method-combination-error (format-control &rest args)
4237	(let ((message (apply #'format nil format-control args)))
4238	(error "Method combination error in CLOS dispatch:~% ~A" message)))
4239
4240
4241	(atomic-defgeneric no-applicable-method (generic-function &rest args)
4242	(:method (generic-function &rest args)
4243	(error "There is no applicable method for the generic function ~S ~
4244	when called with arguments ~S."
4245	generic-function
4246	args)))
4247
4248
4249	;;; FIXME (rudi 2012-01-28): this can be a function, it only needs to
4250	;;; use standard accessor functions
4251	(defgeneric find-method (generic-function
4252	qualifiers
4253	specializers
4254	&optional errorp))
4255
4256	(defmethod find-method ((generic-function standard-generic-function)
4257	qualifiers specializers &optional (errorp t))
4258	(%find-method generic-function qualifiers specializers errorp))
4259
4260	(defgeneric find-method ((generic-function symbol)
4261	qualifiers specializers &optional (errorp t))
4262	(find-method (find-generic-function generic-function errorp)
4263	qualifiers specializers errorp))
4264
4265	;;; AMOP pg. 167
4266	(defgeneric add-method (generic-function method))
4267
4268	(defmethod add-method :before ((generic-function generic-function)
4269	(method method))
4270	(when (and (method-generic-function method)
4271	(not (eql generic-function (method-generic-function method))))
4272	(error 'simple-error
4273	:format-control "~S is already a method of ~S, cannot add to ~S."
4274	:format-arguments (list method (method-generic-function method)
4275	generic-function)))
4276	(check-method-lambda-list (generic-function-name generic-function)
4277	(method-lambda-list method)
4278	(generic-function-lambda-list generic-function)))
4279
4280	(defmethod add-method ((generic-function standard-generic-function)
4281	(method standard-method))
4282	(std-add-method generic-function method))
4283
4284	(defmethod add-method :after ((generic-function generic-function)
4285	(method method))
4286	(map-dependents generic-function
4287	#'(lambda (dep) (update-dependent generic-function dep
4288	'add-method method))))
4289
4290	(defgeneric remove-method (generic-function method))
4291
4292	(defmethod remove-method ((generic-function standard-generic-function)
4293	(method standard-method))
4294	(std-remove-method generic-function method))
4295
4296	(defmethod remove-method :after ((generic-function generic-function)
4297	(method method))
4298	(map-dependents generic-function
4299	#'(lambda (dep) (update-dependent generic-function dep
4300	'remove-method method))))
4301
4302	;; See describe.lisp.
4303	(defgeneric describe-object (object stream))
4304
4305	;; FIXME
4306	(defgeneric no-next-method (generic-function method &rest args))
4307
4308	(atomic-defgeneric function-keywords (method)
4309	(:method ((method standard-method))
4310	(std-function-keywords method)))
4311
4312	(setf gf-initialize-instance (symbol-function 'initialize-instance))
4313	(setf gf-allocate-instance (symbol-function 'allocate-instance))
4314	(setf gf-shared-initialize (symbol-function 'shared-initialize))
4315	(setf gf-reinitialize-instance (symbol-function 'reinitialize-instance))
4316	(setf clos-booting nil)
4317
4318	(atomic-defgeneric class-prototype (class)
4319	(:method ((class standard-class))
4320	(allocate-instance class))
4321	(:method ((class funcallable-standard-class))
4322	(allocate-instance class))
4323	(:method ((class structure-class))
4324	(allocate-instance class))
4325	(:method :before (class)
4326	(unless (class-finalized-p class)
4327	(error "~@<~S is not finalized.~:@>" class))))
4328
4329
4330
4331
4332
4333	(defmethod shared-initialize :before ((instance generic-function)
4334	slot-names
4335	&key lambda-list argument-precedence-order
4336	&allow-other-keys)
4337	(check-argument-precedence-order lambda-list argument-precedence-order))
4338
4339	(defmethod shared-initialize :after ((instance standard-generic-function)
4340	slot-names
4341	&key (lambda-list nil lambda-list-p)
4342	(argument-precedence-order nil a-p-o-p)
4343	(method-combination '(standard))
4344	&allow-other-keys)
4345	(when lambda-list-p
4346	(let* ((plist (analyze-lambda-list lambda-list))
4347	(required-args (getf plist ':required-args)))
4348	(setf (std-slot-value instance 'sys::required-args) required-args)
4349	(setf (std-slot-value instance 'sys::optional-args)
4350	(getf plist :optional-args))
4351	(setf (std-slot-value instance 'sys::argument-precedence-order)
4352	(or (and a-p-o-p argument-precedence-order) required-args))))
4353	(unless (typep (generic-function-method-combination instance)
4354	'method-combination)
4355	;; this fixes (make-instance 'standard-generic-function) -- the
4356	;; constructor of StandardGenericFunction sets this slot to '(standard)
4357	(setf (std-slot-value instance 'sys::%method-combination)
4358	(find-method-combination
4359	instance (car method-combination) (cdr method-combination))))
4360	(finalize-standard-generic-function instance))
4361
4362	;;; Readers for generic function metaobjects
4363	;;; AMOP pg. 216ff.
4364	(atomic-defgeneric generic-function-argument-precedence-order (generic-function)
4365	(:method ((generic-function standard-generic-function))
4366	(std-slot-value generic-function 'sys::argument-precedence-order)))
4367
4368	(atomic-defgeneric generic-function-declarations (generic-function)
4369	(:method ((generic-function standard-generic-function))
4370	(std-slot-value generic-function 'sys::declarations)))
4371
4372	(atomic-defgeneric generic-function-lambda-list (generic-function)
4373	(:method ((generic-function standard-generic-function))
4374	(std-slot-value generic-function 'sys::lambda-list)))
4375
4376	(atomic-defgeneric generic-function-method-class (generic-function)
4377	(:method ((generic-function standard-generic-function))
4378	(std-slot-value generic-function 'sys::method-class)))
4379
4380	(atomic-defgeneric generic-function-method-combination (generic-function)
4381	(:method ((generic-function standard-generic-function))
4382	(std-slot-value generic-function 'sys::%method-combination)))
4383
4384	(atomic-defgeneric generic-function-methods (generic-function)
4385	(:method ((generic-function standard-generic-function))
4386	(std-slot-value generic-function 'sys::methods)))
4387
4388	(atomic-defgeneric generic-function-name (generic-function)
4389	(:method ((generic-function standard-generic-function))
4390	(slot-value generic-function 'sys::name)))
4391
4392	(atomic-defgeneric generic-function-required-arguments (generic-function)
4393	(:method ((generic-function standard-generic-function))
4394	(std-slot-value generic-function 'sys::required-args)))
4395
4396	(atomic-defgeneric generic-function-optional-arguments (generic-function)
4397	(:method ((generic-function standard-generic-function))
4398	(std-slot-value generic-function 'sys::optional-args)))
4399
4400	;;; AMOP pg. 231
4401	(defgeneric (setf generic-function-name) (new-value gf)
4402	(:method (new-value (gf generic-function))
4403	(reinitialize-instance gf :name new-value)))
4404
4405	;;; Readers for Method Metaobjects
4406	;;; AMOP pg. 218ff.
4407
4408	(atomic-defgeneric method-function (method)
4409	(:method ((method standard-method))
4410	(std-method-function method)))
4411
4412	(atomic-defgeneric method-generic-function (method)
4413	(:method ((method standard-method))
4414	(std-method-generic-function method)))
4415
4416	(atomic-defgeneric method-lambda-list (method)
4417	(:method ((method standard-method))
4418	(std-slot-value method 'sys::lambda-list)))
4419
4420	(atomic-defgeneric method-specializers (method)
4421	(:method ((method standard-method))
4422	(std-method-specializers method)))
4423
4424	(atomic-defgeneric method-qualifiers (method)
4425	(:method ((method standard-method))
4426	(std-method-qualifiers method)))
4427
4428	(atomic-defgeneric accessor-method-slot-definition (method)
4429	(:method ((method standard-accessor-method))
4430	(std-accessor-method-slot-definition method)))
4431
4432
4433	;;; find-method-combination
4434
4435	;;; AMOP pg. 191
4436	(atomic-defgeneric find-method-combination (gf name options)
4437	(:method (gf (name symbol) options)
4438	(std-find-method-combination gf name options)))
4439
4440	;;; specializer-direct-method and friends.
4441
4442	;;; AMOP pg. 237
4443	(defgeneric specializer-direct-generic-functions (specializer))
4444
4445	(defmethod specializer-direct-generic-functions ((specializer class))
4446	(delete-duplicates (mapcar #'method-generic-function
4447	(class-direct-methods specializer))))
4448
4449	(defmethod specializer-direct-generic-functions ((specializer eql-specializer))
4450	(delete-duplicates (mapcar #'method-generic-function
4451	(slot-value specializer 'direct-methods))))
4452
4453	;;; AMOP pg. 238
4454	(defgeneric specializer-direct-methods (specializer))
4455
4456	(defmethod specializer-direct-methods ((specializer class))
4457	(class-direct-methods specializer))
4458
4459	(defmethod specializer-direct-methods ((specializer eql-specializer))
4460	(slot-value specializer 'direct-methods))
4461
4462	;;; AMOP pg. 165
4463	(atomic-defgeneric add-direct-method (specializer method)
4464	(:method ((specializer class) (method method))
4465	(pushnew method (class-direct-methods specializer)))
4466	(:method ((specializer eql-specializer) (method method))
4467	(pushnew method (slot-value specializer 'direct-methods))))
4468
4469
4470	;;; AMOP pg. 227
4471	(atomic-defgeneric remove-direct-method (specializer method)
4472	(:method ((specializer class) (method method))
4473	(setf (class-direct-methods specializer)
4474	(remove method (class-direct-methods specializer))))
4475	(:method ((specializer eql-specializer) (method method))
4476	(setf (slot-value specializer 'direct-methods)
4477	(remove method (slot-value specializer 'direct-methods)))))
4478
4479	;;; The Dependent Maintenance Protocol (AMOP pg. 160ff.)
4480
4481	(defvar dependents (make-hash-table :test 'eq :weakness :key))
4482
4483	;;; AMOP pg. 164
4484	(defgeneric add-dependent (metaobject dependent))
4485	(defmethod add-dependent ((metaobject standard-class) dependent)
4486	(pushnew dependent (gethash metaobject dependents nil)))
4487	(defmethod add-dependent ((metaobject funcallable-standard-class) dependent)
4488	(pushnew dependent (gethash metaobject dependents nil)))
4489	(defmethod add-dependent ((metaobject standard-generic-function) dependent)
4490	(pushnew dependent (gethash metaobject dependents nil)))
4491
4492	;;; AMOP pg. 225
4493	(defgeneric remove-dependent (metaobject dependent))
4494	(defmethod remove-dependent ((metaobject standard-class) dependent)
4495	(setf (gethash metaobject dependents)
4496	(delete dependent (gethash metaobject dependents nil) :test #'eq)))
4497	(defmethod remove-dependent ((metaobject funcallable-standard-class) dependent)
4498	(setf (gethash metaobject dependents)
4499	(delete dependent (gethash metaobject dependents nil) :test #'eq)))
4500	(defmethod remove-dependent ((metaobject standard-generic-function) dependent)
4501	(setf (gethash metaobject dependents)
4502	(delete dependent (gethash metaobject dependents nil) :test #'eq)))
4503
4504	;;; AMOP pg. 210
4505	(atomic-defgeneric map-dependents (metaobject function)
4506	(:method ((metaobject standard-class) function)
4507	(dolist (dependent (gethash metaobject dependents nil))
4508	(funcall function dependent)))
4509	(:method ((metaobject funcallable-standard-class) function)
4510	(dolist (dependent (gethash metaobject dependents nil))
4511	(funcall function dependent)))
4512	(:method ((metaobject standard-generic-function) function)
4513	(dolist (dependent (gethash metaobject dependents nil))
4514	(funcall function dependent))))
4515
4516	;;; AMOP pg. 239
4517	(defgeneric update-dependent (metaobject dependent &rest initargs))
4518
4519
4520	;;; ensure-generic-function(-using-class), AMOP pg. 185ff.
4521	(defgeneric ensure-generic-function-using-class (generic-function function-name
4522	&key
4523	argument-precedence-order
4524	declarations documentation
4525	generic-function-class
4526	lambda-list method-class
4527	method-combination
4528	name
4529	&allow-other-keys))
4530
4531	(defmethod ensure-generic-function-using-class
4532	((generic-function generic-function)
4533	function-name
4534	&rest all-keys
4535	&key (generic-function-class (class-of generic-function))
4536	(method-class (generic-function-method-class generic-function))
4537	(method-combination (generic-function-method-combination generic-function))
4538	&allow-other-keys)
4539	(setf all-keys (copy-list all-keys)) ; since we modify it
4540	(remf all-keys :generic-function-class)
4541	(unless (classp generic-function-class)
4542	(setf generic-function-class (find-class generic-function-class)))
4543	(unless (classp method-class) (setf method-class (find-class method-class)))
4544	(unless (eq generic-function-class (class-of generic-function))
4545	(error "The class ~S is incompatible with the existing class (~S) of ~S."
4546	generic-function-class (class-of generic-function) generic-function))
4547	;; We used to check for changes in method class here, but CLHS says:
4548	;; "If function-name specifies a generic function that has a different
4549	;; value for the :method-class argument, the value is changed, but any
4550	;; existing methods are not changed."
4551	(unless (typep method-combination 'method-combination)
4552	(setf method-combination
4553	(find-method-combination generic-function
4554	(car method-combination)
4555	(cdr method-combination))))
4556	(apply #'reinitialize-instance generic-function
4557	:method-combination method-combination
4558	:method-class method-class
4559	all-keys)
4560	generic-function)
4561
4562	(defmethod ensure-generic-function-using-class ((generic-function null)
4563	function-name
4564	&rest all-keys
4565	&key (generic-function-class +the-standard-generic-function-class+)
4566	&allow-other-keys)
4567	(setf all-keys (copy-list all-keys)) ; since we modify it
4568	(remf all-keys :generic-function-class)
4569	(unless (classp generic-function-class)
4570	(setf generic-function-class (find-class generic-function-class)))
4571	(when (and (null clos-booting) (fboundp function-name))
4572	(if (or (autoloadp function-name)
4573	(and (consp function-name)
4574	(eq 'setf (first function-name))
4575	(autoload-ref-p (second function-name))))
4576	(fmakunbound function-name)
4577	(progn
4578	(cerror "Redefine as generic function" "~A already names an ordinary function, macro, or special operator." function-name)
4579	(fmakunbound function-name)
4580	)))
4581	(apply (if (eq generic-function-class +the-standard-generic-function-class+)
4582	#'make-instance-standard-generic-function
4583	#'make-instance)
4584	generic-function-class :name function-name all-keys))
4585
4586	(defun ensure-generic-function (function-name &rest all-keys
4587	&key
4588	lambda-list generic-function-class
4589	method-class
4590	method-combination
4591	argument-precedence-order
4592	declarations
4593	documentation
4594	&allow-other-keys)
4595	(declare (ignore lambda-list generic-function-class method-class
4596	method-combination argument-precedence-order declarations
4597	documentation))
4598	(apply #'ensure-generic-function-using-class
4599	(find-generic-function function-name nil)
4600	function-name all-keys))
4601
4602	;;; SLIME compatibility functions.
4603
4604	(defun %method-generic-function (method)
4605	(method-generic-function method))
4606
4607	(defun %method-function (method)
4608	(method-function method))
4609
4610<