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Last change on this file was 14529, checked in by rschlatte, 12 years ago

Fix (make-instance 'standard-generic-function)

Reported by Pascal Costanza and Anton Vodonosov (via cl-test-grid)

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

File size: 203.1 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 14529 2013-06-09 17:09:28Z rschlatte $
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	,@methods)))
1729
1730	(defun canonicalize-defgeneric-options (options)
1731	(mapappend #'canonicalize-defgeneric-option options))
1732
1733	(defun canonicalize-defgeneric-option (option)
1734	(case (car option)
1735	(:generic-function-class
1736	(list :generic-function-class `(find-class ',(cadr option))))
1737	(:method-class
1738	(list :method-class `(find-class ',(cadr option))))
1739	(:method-combination
1740	(list :method-combination `',(cdr option)))
1741	(:argument-precedence-order
1742	(list :argument-precedence-order `',(cdr option)))
1743	(t
1744	(list `',(car option) `',(cadr option)))))
1745
1746	;; From OpenMCL (called canonicalize-argument-precedence-order there,
1747	;; but AMOP specifies argument-precedence-order to return a permutation
1748	;; of the required arguments, not a list of indices, so we calculate
1749	;; them on demand).
1750	(defun argument-precedence-order-indices (apo req)
1751	(cond ((equal apo req) nil)
1752	((not (eql (length apo) (length req)))
1753	(error 'program-error
1754	:format-control "Specified argument precedence order ~S does not match lambda list."
1755	:format-arguments (list apo)))
1756	(t (let ((res nil))
1757	(dolist (arg apo (nreverse res))
1758	(let ((index (position arg req)))
1759	(if (or (null index) (memq index res))
1760	(error 'program-error
1761	:format-control "Specified argument precedence order ~S does not match lambda list."
1762	:format-arguments (list apo)))
1763	(push index res)))))))
1764
1765	(defun find-generic-function (name &optional (errorp t))
1766	(let ((function (and (fboundp name) (fdefinition name))))
1767	(when function
1768	(when (typep function 'generic-function)
1769	(return-from find-generic-function function))
1770	(when (and traced-names (find name traced-names :test #'equal))
1771	(setf function (untraced-function name))
1772	(when (typep function 'generic-function)
1773	(return-from find-generic-function function)))))
1774	(if errorp
1775	(error "There is no generic function named ~S." name)
1776	nil))
1777
1778	(defun lambda-lists-congruent-p (lambda-list1 lambda-list2)
1779	(let* ((plist1 (analyze-lambda-list lambda-list1))
1780	(args1 (getf plist1 :required-args))
1781	(plist2 (analyze-lambda-list lambda-list2))
1782	(args2 (getf plist2 :required-args)))
1783	(= (length args1) (length args2))))
1784
1785	(defun %defgeneric (function-name &rest all-keys)
1786	(when (fboundp function-name)
1787	(let ((gf (fdefinition function-name)))
1788	(when (typep gf 'standard-generic-function)
1789	;; Remove methods defined by previous DEFGENERIC forms, as
1790	;; specified by CLHS, 7.7 (Macro DEFGENERIC). KLUDGE: only
1791	;; works for subclasses of standard-generic-function. Since
1792	;; AMOP doesn't specify a reader for initial methods, we have to
1793	;; skip this step otherwise.
1794	(dolist (method (std-slot-value gf 'sys::initial-methods))
1795	(std-remove-method gf method)
1796	(map-dependents gf
1797	#'(lambda (dep)
1798	(update-dependent gf dep
1799	'remove-method method))))
1800	(setf (std-slot-value gf 'sys::initial-methods) '()))))
1801	(apply 'ensure-generic-function function-name all-keys))
1802
1803	;;; Bootstrap version of ensure-generic-function, handling only
1804	;;; standard-generic-function. This function is replaced later.
1805	(declaim (notinline ensure-generic-function))
1806	(defun ensure-generic-function (function-name
1807	&rest all-keys
1808	&key
1809	(lambda-list nil lambda-list-supplied-p)
1810	(generic-function-class +the-standard-generic-function-class+)
1811	(method-class +the-standard-method-class+)
1812	(method-combination +the-standard-method-combination+ mc-p)
1813	argument-precedence-order
1814	(documentation nil documentation-supplied-p)
1815	&allow-other-keys)
1816	(setf all-keys (copy-list all-keys)) ; since we modify it
1817	(remf all-keys :generic-function-class)
1818	(let ((gf (find-generic-function function-name nil)))
1819	(if gf
1820	(progn
1821	(when lambda-list-supplied-p
1822	(unless (or (null (generic-function-methods gf))
1823	(lambda-lists-congruent-p lambda-list
1824	(generic-function-lambda-list gf)))
1825	(error 'simple-error
1826	:format-control "The lambda list ~S is incompatible with the existing methods of ~S."
1827	:format-arguments (list lambda-list gf)))
1828	(setf (std-slot-value gf 'sys::lambda-list) lambda-list)
1829	(let* ((plist (analyze-lambda-list lambda-list))
1830	(required-args (getf plist ':required-args)))
1831	(setf (std-slot-value gf 'sys::required-args) required-args)
1832	(setf (std-slot-value gf 'sys::optional-args)
1833	(getf plist :optional-args))))
1834	(setf (std-slot-value gf 'sys::argument-precedence-order)
1835	(or argument-precedence-order (generic-function-required-arguments gf)))
1836	(when documentation-supplied-p
1837	(setf (std-slot-value gf 'sys::%documentation) documentation))
1838	(finalize-standard-generic-function gf)
1839	gf)
1840	(progn
1841	(when (and (null clos-booting)
1842	(and (fboundp function-name)
1843	;; since we're overwriting an autoloader,
1844	;; we're probably meant to redefine it,
1845	;; so throwing an error here might be a bad idea.
1846	;; also, resolving the symbol isn't
1847	;; a good option either: we've seen that lead to
1848	;; recursive loading of the same file
1849	(and (not (autoloadp function-name))
1850	(and (consp function-name)
1851	(eq 'setf (first function-name))
1852	(not (autoload-ref-p (second function-name)))))))
1853	(error 'program-error
1854	:format-control "~A already names an ordinary function, macro, or special operator."
1855	:format-arguments (list function-name)))
1856	(when mc-p
1857	(error "Preliminary ensure-method does not support :method-combination argument."))
1858	(apply #'make-instance-standard-generic-function
1859	generic-function-class
1860	:name function-name
1861	:method-class method-class
1862	:method-combination method-combination
1863	all-keys)))))
1864
1865	(defun collect-eql-specializer-objects (generic-function)
1866	(let ((result nil))
1867	(dolist (method (generic-function-methods generic-function))
1868	(dolist (specializer (method-specializers method))
1869	(when (typep specializer 'eql-specializer)
1870	(pushnew (eql-specializer-object specializer)
1871	result
1872	:test 'eql))))
1873	result))
1874
1875	(defun finalize-standard-generic-function (gf)
1876	(%reinit-emf-cache gf (collect-eql-specializer-objects gf))
1877	(set-funcallable-instance-function
1878	gf
1879	(if (std-generic-function-p gf)
1880	(std-compute-discriminating-function gf)
1881	(compute-discriminating-function gf)))
1882	;; FIXME Do we need to warn on redefinition somewhere else?
1883	(let ((warn-on-redefinition nil))
1884	(setf (fdefinition (generic-function-name gf)) gf))
1885	(values))
1886
1887	(defun make-instance-standard-generic-function (generic-function-class
1888	&key name lambda-list
1889	(method-class +the-standard-method-class+)
1890	(method-combination +the-standard-method-combination+)
1891	argument-precedence-order
1892	declarations
1893	documentation)
1894	;; to avoid circularities, we do not call generic functions in here.
1895	(declare (ignore generic-function-class))
1896	(check-argument-precedence-order lambda-list argument-precedence-order)
1897	(let ((gf (allocate-funcallable-instance +the-standard-generic-function-class+)))
1898	(unless (classp method-class) (setf method-class (find-class method-class)))
1899	(unless (typep method-combination 'method-combination)
1900	(setf method-combination
1901	(find-method-combination
1902	gf (car method-combination) (cdr method-combination))))
1903	(setf (std-slot-value gf 'sys::name) name)
1904	(setf (std-slot-value gf 'sys::lambda-list) lambda-list)
1905	(setf (std-slot-value gf 'sys::initial-methods) ())
1906	(setf (std-slot-value gf 'sys::methods) ())
1907	(setf (std-slot-value gf 'sys::method-class) method-class)
1908	(setf (std-slot-value gf 'sys::%method-combination) method-combination)
1909	(setf (std-slot-value gf 'sys::declarations) declarations)
1910	(setf (std-slot-value gf 'sys::%documentation) documentation)
1911	(let* ((plist (analyze-lambda-list (generic-function-lambda-list gf)))
1912	(required-args (getf plist ':required-args)))
1913	(setf (std-slot-value gf 'sys::required-args) required-args)
1914	(setf (std-slot-value gf 'sys::optional-args) (getf plist :optional-args))
1915	(setf (std-slot-value gf 'sys::argument-precedence-order)
1916	(or argument-precedence-order required-args)))
1917	(finalize-standard-generic-function gf)
1918	gf))
1919
1920	(defun canonicalize-specializers (specializers)
1921	(mapcar #'canonicalize-specializer specializers))
1922
1923	(defun canonicalize-specializer (specializer)
1924	(cond ((classp specializer)
1925	specializer)
1926	((typep specializer 'eql-specializer)
1927	specializer)
1928	((symbolp specializer)
1929	(find-class specializer))
1930	((and (consp specializer)
1931	(eq (car specializer) 'eql))
1932	(let ((object (cadr specializer)))
1933	(when (and (consp object)
1934	(eq (car object) 'quote))
1935	(setf object (cadr object)))
1936	(intern-eql-specializer object)))
1937	((and (consp specializer)
1938	(eq (car specializer) 'java:jclass))
1939	(let ((jclass (eval specializer)))
1940	(java::ensure-java-class jclass)))
1941	(t
1942	(error "Unknown specializer: ~S" specializer))))
1943
1944	(defun parse-defmethod (args)
1945	(let ((function-name (car args))
1946	(qualifiers ())
1947	(specialized-lambda-list ())
1948	(body ())
1949	(parse-state :qualifiers))
1950	(dolist (arg (cdr args))
1951	(ecase parse-state
1952	(:qualifiers
1953	(if (and (atom arg) (not (null arg)))
1954	(push arg qualifiers)
1955	(progn
1956	(setf specialized-lambda-list arg)
1957	(setf parse-state :body))))
1958	(:body (push arg body))))
1959	(setf qualifiers (nreverse qualifiers)
1960	body (nreverse body))
1961	(multiple-value-bind (real-body declarations documentation)
1962	(parse-body body)
1963	(values function-name
1964	qualifiers
1965	(extract-lambda-list specialized-lambda-list)
1966	(extract-specializer-names specialized-lambda-list)
1967	documentation
1968	declarations
1969	(list* 'block
1970	(fdefinition-block-name function-name)
1971	real-body)))))
1972
1973	(defun required-portion (gf args)
1974	(let ((number-required (length (generic-function-required-arguments gf))))
1975	(when (< (length args) number-required)
1976	(error 'program-error
1977	:format-control "Not enough arguments for generic function ~S."
1978	:format-arguments (list (generic-function-name gf))))
1979	(subseq args 0 number-required)))
1980
1981	(defun extract-lambda-list (specialized-lambda-list)
1982	(let* ((plist (analyze-lambda-list specialized-lambda-list))
1983	(requireds (getf plist :required-names))
1984	(rv (getf plist :rest-var))
1985	(ks (getf plist :key-args))
1986	(keysp (getf plist :keysp))
1987	(aok (getf plist :allow-other-keys))
1988	(opts (getf plist :optional-args))
1989	(auxs (getf plist :auxiliary-args)))
1990	`(,@requireds
1991	,@(if opts `(&optional ,@opts) ())
1992	,@(if rv `(&rest ,rv) ())
1993	,@(if (or ks keysp aok) `(&key ,@ks) ())
1994	,@(if aok '(&allow-other-keys) ())
1995	,@(if auxs `(&aux ,@auxs) ()))))
1996
1997	(defun extract-specializer-names (specialized-lambda-list)
1998	(let ((plist (analyze-lambda-list specialized-lambda-list)))
1999	(getf plist ':specializers)))
2000
2001	(defun get-keyword-from-arg (arg)
2002	(if (listp arg)
2003	(if (listp (car arg))
2004	(caar arg)
2005	(make-keyword (car arg)))
2006	(make-keyword arg)))
2007
2008	(defun analyze-lambda-list (lambda-list)
2009	(let ((keys ()) ; Just the keywords
2010	(key-args ()) ; Keywords argument specs
2011	(keysp nil) ;
2012	(required-names ()) ; Just the variable names
2013	(required-args ()) ; Variable names & specializers
2014	(specializers ()) ; Just the specializers
2015	(rest-var nil)
2016	(optionals ())
2017	(auxs ())
2018	(allow-other-keys nil)
2019	(state :required))
2020	(dolist (arg lambda-list)
2021	(if (member arg lambda-list-keywords)
2022	(ecase arg
2023	(&optional
2024	(unless (eq state :required)
2025	(error 'program-error
2026	:format-control "~A followed by &OPTIONAL not allowed ~
2027	in lambda list ~S"
2028	:format-arguments (list state lambda-list)))
2029	(setq state '&optional))
2030	(&rest
2031	(unless (or (eq state :required)
2032	(eq state '&optional))
2033	(error 'program-error
2034	:format-control "~A followed by &REST not allowed ~
2035	in lambda list ~S"
2036	:format-arguments (list state lambda-list)))
2037	(setq state '&rest))
2038	(&key
2039	(unless (or (eq state :required)
2040	(eq state '&optional)
2041	(eq state '&rest))
2042	(error 'program-error
2043	:format-control "~A followed by &KEY not allowed
2044	in lambda list ~S"
2045	:format-arguments (list state lambda-list)))
2046	(setq keysp t)
2047	(setq state '&key))
2048	(&allow-other-keys
2049	(unless (eq state '&key)
2050	(error 'program-error
2051	:format-control "&ALLOW-OTHER-KEYS not allowed while
2052	parsing ~A in lambda list ~S"
2053	:format-arguments (list state lambda-list)))
2054	(setq allow-other-keys 't))
2055	(&aux
2056	;; &aux comes last; any other previous state is fine
2057	(setq state '&aux)))
2058	(case state
2059	(:required
2060	(push-on-end arg required-args)
2061	(if (listp arg)
2062	(progn (push-on-end (car arg) required-names)
2063	(push-on-end (cadr arg) specializers))
2064	(progn (push-on-end arg required-names)
2065	(push-on-end 't specializers))))
2066	(&optional (push-on-end arg optionals))
2067	(&rest (setq rest-var arg))
2068	(&key
2069	(push-on-end (get-keyword-from-arg arg) keys)
2070	(push-on-end arg key-args))
2071	(&aux (push-on-end arg auxs)))))
2072	(list :required-names required-names
2073	:required-args required-args
2074	:specializers specializers
2075	:rest-var rest-var
2076	:keywords keys
2077	:key-args key-args
2078	:keysp keysp
2079	:auxiliary-args auxs
2080	:optional-args optionals
2081	:allow-other-keys allow-other-keys)))
2082
2083	#+nil
2084	(defun check-method-arg-info (gf arg-info method)
2085	(multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
2086	(analyze-lambda-list (if (consp method)
2087	(early-method-lambda-list method)
2088	(method-lambda-list method)))
2089	(flet ((lose (string &rest args)
2090	(error 'simple-program-error
2091	:format-control "~@<attempt to add the method~2I~_~S~I~_~
2092	to the generic function~2I~_~S;~I~_~
2093	but ~?~:>"
2094	:format-arguments (list method gf string args)))
2095	(comparison-description (x y)
2096	(if (> x y) "more" "fewer")))
2097	(let ((gf-nreq (arg-info-number-required arg-info))
2098	(gf-nopt (arg-info-number-optional arg-info))
2099	(gf-key/rest-p (arg-info-key/rest-p arg-info))
2100	(gf-keywords (arg-info-keys arg-info)))
2101	(unless (= nreq gf-nreq)
2102	(lose
2103	"the method has ~A required arguments than the generic function."
2104	(comparison-description nreq gf-nreq)))
2105	(unless (= nopt gf-nopt)
2106	(lose
2107	"the method has ~A optional arguments than the generic function."
2108	(comparison-description nopt gf-nopt)))
2109	(unless (eq (or keysp restp) gf-key/rest-p)
2110	(lose
2111	"the method and generic function differ in whether they accept~_~
2112	&REST or &KEY arguments."))
2113	(when (consp gf-keywords)
2114	(unless (or (and restp (not keysp))
2115	allow-other-keys-p
2116	(every (lambda (k) (memq k keywords)) gf-keywords))
2117	(lose "the method does not accept each of the &KEY arguments~2I~_~
2118	~S."
2119	gf-keywords)))))))
2120
2121	(defun check-method-lambda-list (name method-lambda-list gf-lambda-list)
2122	(let* ((gf-restp (not (null (memq '&rest gf-lambda-list))))
2123	(gf-plist (analyze-lambda-list gf-lambda-list))
2124	(gf-keysp (getf gf-plist :keysp))
2125	(gf-keywords (getf gf-plist :keywords))
2126	(method-plist (analyze-lambda-list method-lambda-list))
2127	(method-restp (not (null (memq '&rest method-lambda-list))))
2128	(method-keysp (getf method-plist :keysp))
2129	(method-keywords (getf method-plist :keywords))
2130	(method-allow-other-keys-p (getf method-plist :allow-other-keys)))
2131	(unless (= (length (getf gf-plist :required-args))
2132	(length (getf method-plist :required-args)))
2133	(error "The method-lambda-list ~S ~
2134	has the wrong number of required arguments ~
2135	for the generic function ~S." method-lambda-list name))
2136	(unless (= (length (getf gf-plist :optional-args))
2137	(length (getf method-plist :optional-args)))
2138	(error "The method-lambda-list ~S ~
2139	has the wrong number of optional arguments ~
2140	for the generic function ~S." method-lambda-list name))
2141	(unless (eq (or gf-restp gf-keysp) (or method-restp method-keysp))
2142	(error "The method-lambda-list ~S ~
2143	and the generic function ~S ~
2144	differ in whether they accept &REST or &KEY arguments."
2145	method-lambda-list name))
2146	(when (consp gf-keywords)
2147	(unless (or (and method-restp (not method-keysp))
2148	method-allow-other-keys-p
2149	(every (lambda (k) (memq k method-keywords)) gf-keywords))
2150	(error "The method-lambda-list ~S does not accept ~
2151	all of the keyword arguments defined for the ~
2152	generic function." method-lambda-list name)))))
2153
2154	(defun check-argument-precedence-order (lambda-list argument-precedence-order)
2155	(when argument-precedence-order
2156	(if lambda-list
2157	;; raising the required program-errors is a side-effect of
2158	;; calculating the given permutation of apo vs req
2159	(argument-precedence-order-indices
2160	argument-precedence-order
2161	(getf (analyze-lambda-list lambda-list) :required-args))
2162	;; AMOP pg. 198
2163	(error 'program-error "argument precedence order specified without lambda list"))))
2164
2165	(defvar gf-initialize-instance nil
2166	"Cached value of the INITIALIZE-INSTANCE generic function.
2167	Initialized with the true value near the end of the file.")
2168	(defvar gf-allocate-instance nil
2169	"Cached value of the ALLOCATE-INSTANCE generic function.
2170	Initialized with the true value near the end of the file.")
2171	(defvar gf-shared-initialize nil
2172	"Cached value of the SHARED-INITIALIZE generic function.
2173	Initialized with the true value near the end of the file.")
2174	(defvar gf-reinitialize-instance nil
2175	"Cached value of the REINITIALIZE-INSTANCE generic function.
2176	Initialized with the true value near the end of the file.")
2177
2178	(declaim (ftype (function * method) ensure-method))
2179	(defun ensure-method (name &rest all-keys)
2180	(let ((method-lambda-list (getf all-keys :lambda-list))
2181	(gf (find-generic-function name nil)))
2182	(when (or (eq gf gf-initialize-instance)
2183	(eq gf gf-allocate-instance)
2184	(eq gf gf-shared-initialize)
2185	(eq gf gf-reinitialize-instance))
2186	;; ### Clearly, this can be targeted much more exact
2187	;; as we only need to remove the specializing class and all
2188	;; its subclasses from the hash.
2189	(clrhash make-instance-initargs-cache)
2190	(clrhash reinitialize-instance-initargs-cache))
2191	(if gf
2192	(check-method-lambda-list name method-lambda-list
2193	(generic-function-lambda-list gf))
2194	(setf gf (ensure-generic-function name :lambda-list method-lambda-list)))
2195	(let ((method
2196	(if (eq (generic-function-method-class gf) +the-standard-method-class+)
2197	(apply #'make-instance-standard-method gf all-keys)
2198	(apply #'make-instance (generic-function-method-class gf) all-keys))))
2199	(if (and
2200	(eq (generic-function-method-class gf) +the-standard-method-class+)
2201	(std-generic-function-p gf))
2202	(progn
2203	(std-add-method gf method)
2204	(map-dependents gf
2205	#'(lambda (dep)
2206	(update-dependent gf dep 'add-method method))))
2207	(add-method gf method))
2208	method)))
2209
2210	(defun make-instance-standard-method (gf
2211	&key
2212	lambda-list
2213	qualifiers
2214	specializers
2215	documentation
2216	function
2217	fast-function)
2218	(declare (ignore gf))
2219	(let ((method (std-allocate-instance +the-standard-method-class+))
2220	(analyzed-args (analyze-lambda-list lambda-list)))
2221	(setf (method-lambda-list method) lambda-list)
2222	(setf (method-qualifiers method) qualifiers)
2223	(setf (std-slot-value method 'sys::specializers)
2224	(canonicalize-specializers specializers))
2225	(setf (method-documentation method) documentation)
2226	(setf (std-slot-value method 'sys::%generic-function) nil) ; set by add-method
2227	(setf (std-slot-value method 'sys::%function) function)
2228	(setf (std-slot-value method 'sys::fast-function) fast-function)
2229	(setf (std-slot-value method 'sys::keywords) (getf analyzed-args :keywords))
2230	(setf (std-slot-value method 'sys::other-keywords-p)
2231	(getf analyzed-args :allow-other-keys))
2232	method))
2233
2234	;;; To be redefined as generic functions later
2235	(declaim (notinline add-direct-method))
2236	(defun add-direct-method (specializer method)
2237	(if (typep specializer 'eql-specializer)
2238	(pushnew method (std-slot-value specializer 'direct-methods))
2239	(pushnew method (class-direct-methods specializer))))
2240
2241	(declaim (notinline remove-direct-method))
2242	(defun remove-direct-method (specializer method)
2243	(if (typep specializer 'eql-specializer)
2244	(setf (std-slot-value specializer 'direct-methods)
2245	(remove method (std-slot-value specializer 'direct-methods)))
2246	(setf (class-direct-methods specializer)
2247	(remove method (class-direct-methods specializer)))))
2248
2249	(defun std-add-method (gf method)
2250	;; calls sites need to make sure that method is either a method of the
2251	;; given gf or does not have a gf.
2252	(let ((old-method (%find-method gf (std-method-qualifiers method)
2253	(method-specializers method) nil)))
2254	(when old-method
2255	(if (and (std-generic-function-p gf)
2256	(eq (class-of old-method) +the-standard-method-class+))
2257	(std-remove-method gf old-method)
2258	(remove-method gf old-method))))
2259	(setf (std-slot-value method 'sys::%generic-function) gf)
2260	(push method (std-slot-value gf 'sys::methods))
2261	(dolist (specializer (method-specializers method))
2262	(add-direct-method specializer method))
2263	(finalize-standard-generic-function gf)
2264	gf)
2265
2266	(defun std-remove-method (gf method)
2267	(setf (std-slot-value gf 'sys::methods)
2268	(remove method (generic-function-methods gf)))
2269	(setf (std-slot-value method 'sys::%generic-function) nil)
2270	(dolist (specializer (method-specializers method))
2271	(remove-direct-method specializer method))
2272	(finalize-standard-generic-function gf)
2273	gf)
2274
2275	(defun %find-method (gf qualifiers specializers &optional (errorp t))
2276	;; "If the specializers argument does not correspond in length to the number
2277	;; of required arguments of the generic-function, an an error of type ERROR
2278	;; is signaled."
2279	(unless (= (length specializers) (length (generic-function-required-arguments gf)))
2280	(error "The specializers argument has length ~S, but ~S has ~S required parameters."
2281	(length specializers)
2282	gf
2283	(length (generic-function-required-arguments gf))))
2284	(let* ((canonical-specializers (canonicalize-specializers specializers))
2285	(method
2286	(find-if #'(lambda (method)
2287	(and (equal qualifiers
2288	(method-qualifiers method))
2289	(equal canonical-specializers
2290	(method-specializers method))))
2291	(generic-function-methods gf))))
2292	(if (and (null method) errorp)
2293	(error "No such method for ~S." (generic-function-name gf))
2294	method)))
2295
2296	(defun fast-callable-p (gf)
2297	(and (eq (method-combination-name (generic-function-method-combination gf))
2298	'standard)
2299	(null (intersection (generic-function-lambda-list gf)
2300	'(&rest &optional &key &allow-other-keys &aux)))))
2301
2302	(defun std-compute-discriminating-function (gf)
2303	;; In this function, we know that gf is of class
2304	;; standard-generic-function, so we can access the instance's slots
2305	;; via std-slot-value. This breaks circularities when redefining
2306	;; generic function accessors.
2307	(let ((methods (std-slot-value gf 'sys::methods)))
2308	(cond
2309	((and (= (length methods) 1)
2310	(eq (type-of (car methods)) 'standard-reader-method)
2311	(eq (type-of (car (std-method-specializers (car methods))))
2312	'standard-class))
2313	(let* ((method (first methods))
2314	(slot-definition (std-slot-value method 'sys::%slot-definition))
2315	(slot-name (std-slot-value slot-definition 'sys:name))
2316	(class (car (std-method-specializers method))))
2317	#'(lambda (instance)
2318	;; TODO: elide this test for low values of SAFETY
2319	(unless (typep instance class)
2320	(no-applicable-method gf (list instance)))
2321	;; hash table lookup for slot position in Layout object via
2322	;; StandardObject.SLOT_VALUE, so should be reasonably fast
2323	(std-slot-value instance slot-name))))
2324	((and (= (length methods) 1)
2325	(eq (type-of (car methods)) 'standard-writer-method)
2326	(eq (type-of (second (std-method-specializers (car methods))))
2327	'standard-class))
2328	(let* ((method (first methods))
2329	(slot-definition (std-slot-value method 'sys::%slot-definition))
2330	(slot-name (std-slot-value slot-definition 'sys:name))
2331	(class (car (std-method-specializers method))))
2332	#'(lambda (new-value instance)
2333	;; TODO: elide this test for low values of SAFETY
2334	(unless (typep instance class)
2335	(no-applicable-method gf (list new-value instance)))
2336	;; hash table lookup for slot position in Layout object via
2337	;; StandardObject.SET_SLOT_VALUE, so should be reasonably fast
2338	(setf (std-slot-value instance slot-name) new-value))))
2339	(t
2340	(let* ((number-required (length (generic-function-required-arguments gf)))
2341	(lambda-list (generic-function-lambda-list gf))
2342	(exact (null (intersection lambda-list
2343	'(&rest &optional &key
2344	&allow-other-keys))))
2345	(no-aux (null (some
2346	(lambda (method)
2347	(find '&aux (std-slot-value method 'sys::lambda-list)))
2348	methods))))
2349	(if (and exact
2350	no-aux)
2351	(cond
2352	((= number-required 1)
2353	(cond
2354	((and (eq (method-combination-name
2355	(std-slot-value gf 'sys::%method-combination))
2356	'standard)
2357	(= (length methods) 1)
2358	(std-method-fast-function (%car methods)))
2359	(let* ((method (%car methods))
2360	(specializer (car (std-method-specializers method)))
2361	(function (std-method-fast-function method)))
2362	(if (typep specializer 'eql-specializer)
2363	(let ((specializer-object (eql-specializer-object specializer)))
2364	#'(lambda (arg)
2365	(declare (optimize speed))
2366	(if (eql arg specializer-object)
2367	(funcall function arg)
2368	(no-applicable-method gf (list arg)))))
2369	#'(lambda (arg)
2370	(declare (optimize speed))
2371	(unless (simple-typep arg specializer)
2372	;; FIXME no applicable method
2373	(error 'simple-type-error
2374	:datum arg
2375	:expected-type specializer))
2376	(funcall function arg)))))
2377	(t
2378	#'(lambda (arg)
2379	(declare (optimize speed))
2380	(let* ((args (list arg))
2381	(emfun (get-cached-emf gf args)))
2382	(if emfun
2383	(funcall emfun args)
2384	(slow-method-lookup gf args)))))))
2385	((= number-required 2)
2386	#'(lambda (arg1 arg2)
2387	(declare (optimize speed))
2388	(let* ((args (list arg1 arg2))
2389	(emfun (get-cached-emf gf args)))
2390	(if emfun
2391	(funcall emfun args)
2392	(slow-method-lookup gf args)))))
2393	((= number-required 3)
2394	#'(lambda (arg1 arg2 arg3)
2395	(declare (optimize speed))
2396	(let* ((args (list arg1 arg2 arg3))
2397	(emfun (get-cached-emf gf args)))
2398	(if emfun
2399	(funcall emfun args)
2400	(slow-method-lookup gf args)))))
2401	(t
2402	#'(lambda (&rest args)
2403	(declare (optimize speed))
2404	(let ((len (length args)))
2405	(unless (= len number-required)
2406	(error 'program-error
2407	:format-control "Not enough arguments for generic function ~S."
2408	:format-arguments (list (generic-function-name gf)))))
2409	(let ((emfun (get-cached-emf gf args)))
2410	(if emfun
2411	(funcall emfun args)
2412	(slow-method-lookup gf args))))))
2413	#'(lambda (&rest args)
2414	(declare (optimize speed))
2415	(let ((len (length args)))
2416	(unless (>= len number-required)
2417	(error 'program-error
2418	:format-control "Not enough arguments for generic function ~S."
2419	:format-arguments (list (generic-function-name gf)))))
2420	(let ((emfun (get-cached-emf gf args)))
2421	(if emfun
2422	(funcall emfun args)
2423	(slow-method-lookup gf args))))))))))
2424
2425	(defun sort-methods (methods gf required-classes)
2426	(if (or (null methods) (null (%cdr methods)))
2427	methods
2428	(sort methods
2429	(if (std-generic-function-p gf)
2430	(let ((method-indices
2431	(argument-precedence-order-indices
2432	(generic-function-argument-precedence-order gf)
2433	(getf (analyze-lambda-list (generic-function-lambda-list gf))
2434	':required-args))))
2435	#'(lambda (m1 m2)
2436	(std-method-more-specific-p
2437	m1 m2 required-classes method-indices)))
2438	#'(lambda (m1 m2)
2439	(method-more-specific-p gf m1 m2 required-classes))))))
2440
2441	(defun method-applicable-p (method args)
2442	(do* ((specializers (method-specializers method) (cdr specializers))
2443	(args args (cdr args)))
2444	((null specializers) t)
2445	(let ((specializer (car specializers)))
2446	(if (typep specializer 'eql-specializer)
2447	(unless (eql (car args) (eql-specializer-object specializer))
2448	(return nil))
2449	(unless (subclassp (class-of (car args)) specializer)
2450	(return nil))))))
2451
2452	(defun std-compute-applicable-methods (gf args)
2453	(let ((required-classes (mapcar #'class-of (required-portion gf args)))
2454	(methods '()))
2455	(dolist (method (generic-function-methods gf))
2456	(when (method-applicable-p method args)
2457	(push method methods)))
2458	(sort-methods methods gf required-classes)))
2459
2460	(declaim (notinline compute-applicable-methods))
2461	(defun compute-applicable-methods (gf args)
2462	(std-compute-applicable-methods gf args))
2463
2464	;;; METHOD-APPLICABLE-USING-CLASSES-P
2465	;;;
2466	;;; If the first return value is T, METHOD is definitely applicable to
2467	;;; arguments that are instances of CLASSES. If the first value is
2468	;;; NIL and the second value is T, METHOD is definitely not applicable
2469	;;; to arguments that are instances of CLASSES; if the second value is
2470	;;; NIL the applicability of METHOD cannot be determined by inspecting
2471	;;; the classes of its arguments only.
2472	;;;
2473	(defun method-applicable-using-classes-p (method classes)
2474	(do* ((specializers (method-specializers method) (cdr specializers))
2475	(classes classes (cdr classes))
2476	(knownp t))
2477	((null specializers)
2478	(if knownp (values t t) (values nil nil)))
2479	(let ((specializer (car specializers)))
2480	(if (typep specializer 'eql-specializer)
2481	(if (eql (class-of (eql-specializer-object specializer))
2482	(car classes))
2483	(setf knownp nil)
2484	(return (values nil t)))
2485	(unless (subclassp (car classes) specializer)
2486	(return (values nil t)))))))
2487
2488	(defun check-applicable-method-keyword-args (gf args
2489	keyword-args
2490	applicable-keywords)
2491	(when (oddp (length keyword-args))
2492	(error 'program-error
2493	:format-control "Odd number of keyword arguments in call to ~S ~
2494	with arguments list ~S"
2495	:format-arguments (list gf args)))
2496	(unless (getf keyword-args :allow-other-keys)
2497	(loop for key in keyword-args by #'cddr
2498	unless (or (member key applicable-keywords)
2499	(eq key :allow-other-keys))
2500	do (error 'program-error
2501	:format-control "Invalid keyword argument ~S in call ~
2502	to ~S with argument list ~S."
2503	:format-arguments (list key gf args)))))
2504
2505	(defun compute-applicable-keywords (gf applicable-methods)
2506	(let ((applicable-keywords
2507	(getf (analyze-lambda-list (generic-function-lambda-list gf))
2508	:keywords)))
2509	(loop for method in applicable-methods
2510	do (multiple-value-bind
2511	(keywords allow-other-keys)
2512	(function-keywords method)
2513	(when allow-other-keys
2514	(setf applicable-keywords :any)
2515	(return))
2516	(setf applicable-keywords
2517	(union applicable-keywords keywords))))
2518	applicable-keywords))
2519
2520	(defun wrap-emfun-for-keyword-args-check (gf emfun non-keyword-args
2521	applicable-keywords)
2522	#'(lambda (args)
2523	(check-applicable-method-keyword-args
2524	gf args
2525	(nthcdr non-keyword-args args) applicable-keywords)
2526	(funcall emfun args)))
2527
2528	(defun slow-method-lookup (gf args)
2529	(let ((applicable-methods
2530	(if (std-generic-function-p gf)
2531	(std-compute-applicable-methods gf args)
2532	(or (compute-applicable-methods-using-classes gf (mapcar #'class-of args))
2533	(compute-applicable-methods gf args)))))
2534	(if applicable-methods
2535	(let* ((emfun (funcall (if (std-generic-function-p gf)
2536	#'std-compute-effective-method
2537	#'compute-effective-method)
2538	gf (generic-function-method-combination gf)
2539	applicable-methods))
2540	(non-keyword-args (+ (length (generic-function-required-arguments gf))
2541	(length (generic-function-optional-arguments gf))))
2542	(gf-lambda-list (generic-function-lambda-list gf))
2543	(checks-required (and (member '&key gf-lambda-list)
2544	(not (member '&allow-other-keys
2545	gf-lambda-list))))
2546	(applicable-keywords
2547	(when checks-required
2548	;; Don't do applicable keyword checks when this is
2549	;; one of the 'exceptional four' or when the gf allows
2550	;; other keywords.
2551	(compute-applicable-keywords gf applicable-methods))))
2552	(when (and checks-required
2553	(not (eq applicable-keywords :any)))
2554	(setf emfun
2555	(wrap-emfun-for-keyword-args-check gf emfun non-keyword-args
2556	applicable-keywords)))
2557	(cache-emf gf args emfun)
2558	(funcall emfun args))
2559	(apply #'no-applicable-method gf args))))
2560
2561	(defun sub-specializer-p (c1 c2 c-arg)
2562	(find c2 (cdr (memq c1 (%class-precedence-list c-arg)))))
2563
2564	(defun std-method-more-specific-p (method1 method2 required-classes argument-precedence-order)
2565	(if argument-precedence-order
2566	(let ((specializers-1 (std-method-specializers method1))
2567	(specializers-2 (std-method-specializers method2)))
2568	(dolist (index argument-precedence-order)
2569	(let ((spec1 (nth index specializers-1))
2570	(spec2 (nth index specializers-2)))
2571	(unless (eq spec1 spec2)
2572	(cond ((typep spec1 'eql-specializer)
2573	(return t))
2574	((typep spec2 'eql-specializer)
2575	(return nil))
2576	(t
2577	(return (sub-specializer-p spec1 spec2
2578	(nth index required-classes)))))))))
2579	(do ((specializers-1 (std-method-specializers method1) (cdr specializers-1))
2580	(specializers-2 (std-method-specializers method2) (cdr specializers-2))
2581	(classes required-classes (cdr classes)))
2582	((null specializers-1) nil)
2583	(let ((spec1 (car specializers-1))
2584	(spec2 (car specializers-2)))
2585	(unless (eq spec1 spec2)
2586	(cond ((typep spec1 'eql-specializer)
2587	(return t))
2588	((typep spec2 'eql-specializer)
2589	(return nil))
2590	(t
2591	(return (sub-specializer-p spec1 spec2 (car classes))))))))))
2592
2593	(defun primary-method-p (method)
2594	(null (intersection '(:before :after :around) (method-qualifiers method))))
2595
2596	(defun before-method-p (method)
2597	(equal '(:before) (method-qualifiers method)))
2598
2599	(defun after-method-p (method)
2600	(equal '(:after) (method-qualifiers method)))
2601
2602	(defun around-method-p (method)
2603	(equal '(:around) (method-qualifiers method)))
2604
2605	(defun process-next-method-list (next-method-list)
2606	(mapcar #'(lambda (next-method-form)
2607	(cond
2608	((listp next-method-form)
2609	(assert (eq (first next-method-form) 'make-method))
2610	(let* ((rest-sym (gensym)))
2611	(make-instance-standard-method
2612	nil ;; ignored
2613	:lambda-list (list '&rest rest-sym)
2614	:function (compute-method-function `(lambda (&rest ,rest-sym)
2615	,(second next-method-form))))))
2616	(t
2617	(assert (typep next-method-form 'method))
2618	next-method-form)))
2619	next-method-list))
2620
2621	(defun std-compute-effective-method (gf method-combination methods)
2622	(assert (typep method-combination 'method-combination))
2623	(let* ((mc-name (method-combination-name method-combination))
2624	(options (slot-value method-combination 'options))
2625	(order (car options))
2626	(primaries '())
2627	(arounds '())
2628	around
2629	emf-form
2630	(long-method-combination-p
2631	(typep method-combination 'long-method-combination)))
2632	(unless long-method-combination-p
2633	(dolist (m methods)
2634	(let ((qualifiers (method-qualifiers m)))
2635	(cond ((null qualifiers)
2636	(if (eq mc-name 'standard)
2637	(push m primaries)
2638	(error "Method combination type mismatch: missing qualifier for method combination ~S." method-combination)))
2639	((cdr qualifiers)
2640	(error "Invalid method qualifiers."))
2641	((eq (car qualifiers) :around)
2642	(push m arounds))
2643	((eq (car qualifiers) mc-name)
2644	(push m primaries))
2645	((memq (car qualifiers) '(:before :after)))
2646	(t
2647	(error "Invalid method qualifiers."))))))
2648	(unless (eq order :most-specific-last)
2649	(setf primaries (nreverse primaries)))
2650	(setf arounds (nreverse arounds))
2651	(setf around (car arounds))
2652	(when (and (null primaries) (not long-method-combination-p))
2653	(error "No primary methods for the generic function ~S." gf))
2654	(cond
2655	(around
2656	(let ((next-emfun
2657	(funcall
2658	(if (std-generic-function-p gf)
2659	#'std-compute-effective-method
2660	#'compute-effective-method)
2661	gf method-combination (remove around methods))))
2662	(setf emf-form
2663	(generate-emf-lambda (method-function around) next-emfun))))
2664	((eq mc-name 'standard)
2665	(let* ((next-emfun (compute-primary-emfun (cdr primaries)))
2666	(befores (remove-if-not #'before-method-p methods))
2667	(reverse-afters
2668	(reverse (remove-if-not #'after-method-p methods))))
2669	(setf emf-form
2670	(cond
2671	((and (null befores) (null reverse-afters))
2672	(let ((fast-function (std-method-fast-function (car primaries))))
2673	(if fast-function
2674	(ecase (length (generic-function-required-arguments gf))
2675	(1
2676	#'(lambda (args)
2677	(declare (optimize speed))
2678	(funcall fast-function (car args))))
2679	(2
2680	#'(lambda (args)
2681	(declare (optimize speed))
2682	(funcall fast-function (car args) (cadr args)))))
2683	(generate-emf-lambda (std-method-function (car primaries))
2684	next-emfun))))
2685	(t
2686	(let ((method-function (method-function (car primaries))))
2687	#'(lambda (args)
2688	(declare (optimize speed))
2689	(dolist (before befores)
2690	(funcall (method-function before) args nil))
2691	(multiple-value-prog1
2692	(funcall method-function args next-emfun)
2693	(dolist (after reverse-afters)
2694	(funcall (method-function after) args nil))))))))))
2695	(long-method-combination-p
2696	(let ((function (long-method-combination-function method-combination))
2697	(arguments (slot-value method-combination 'options)))
2698	(assert function)
2699	(setf emf-form
2700	(if arguments
2701	(apply function gf methods arguments)
2702	(funcall function gf methods)))))
2703	(t
2704	(unless (typep method-combination 'short-method-combination)
2705	(error "Unsupported method combination type ~A." mc-name))
2706	(let ((operator (short-method-combination-operator method-combination))
2707	(ioa (short-method-combination-identity-with-one-argument method-combination)))
2708	(setf emf-form
2709	(if (and ioa (null (cdr primaries)))
2710	(generate-emf-lambda (method-function (car primaries)) nil)
2711	`(lambda (args)
2712	(,operator ,@(mapcar
2713	(lambda (primary)
2714	`(funcall ,(method-function primary) args nil))
2715	primaries))))))))
2716	(assert (not (null emf-form)))
2717	(or #+nil (ignore-errors (autocompile emf-form))
2718	(coerce-to-function emf-form))))
2719
2720	(defun generate-emf-lambda (method-function next-emfun)
2721	#'(lambda (args)
2722	(declare (optimize speed))
2723	(funcall method-function args next-emfun)))
2724
2725	;;; compute an effective method function from a list of primary methods:
2726
2727	(defun compute-primary-emfun (methods)
2728	(if (null methods)
2729	nil
2730	(let ((next-emfun (compute-primary-emfun (cdr methods))))
2731	#'(lambda (args)
2732	(funcall (std-method-function (car methods)) args next-emfun)))))
2733
2734	(defvar call-next-method-p)
2735	(defvar next-method-p-p)
2736
2737	(defun walk-form (form)
2738	(cond ((atom form)
2739	(cond ((eq form 'call-next-method)
2740	(setf call-next-method-p t))
2741	((eq form 'next-method-p)
2742	(setf next-method-p-p t))))
2743	(t
2744	(walk-form (%car form))
2745	(walk-form (%cdr form)))))
2746
2747	(defun compute-method-function (lambda-expression)
2748	(let ((lambda-list (allow-other-keys (cadr lambda-expression)))
2749	(body (cddr lambda-expression))
2750	(call-next-method-p nil)
2751	(next-method-p-p nil))
2752	(multiple-value-bind (body declarations) (parse-body body)
2753	(let ((ignorable-vars '()))
2754	(dolist (var lambda-list)
2755	(if (memq var lambda-list-keywords)
2756	(return)
2757	(push var ignorable-vars)))
2758	(push `(declare (ignorable ,@ignorable-vars)) declarations))
2759	(walk-form body)
2760	(cond ((or call-next-method-p next-method-p-p)
2761	`(lambda (args next-emfun)
2762	(flet ((call-next-method (&rest cnm-args)
2763	(if (null next-emfun)
2764	(error "No next method for generic function.")
2765	(funcall next-emfun (or cnm-args args))))
2766	(next-method-p ()
2767	(not (null next-emfun))))
2768	(declare (ignorable (function call-next-method)
2769	(function next-method-p)))
2770	(apply #'(lambda ,lambda-list ,@declarations ,@body) args))))
2771	((null (intersection lambda-list '(&rest &optional &key &allow-other-keys &aux)))
2772	;; Required parameters only.
2773	(case (length lambda-list)
2774	(1
2775	`(lambda (args next-emfun)
2776	(declare (ignore next-emfun))
2777	(let ((,(%car lambda-list) (%car args)))
2778	(declare (ignorable ,(%car lambda-list)))
2779	,@declarations ,@body)))
2780	(2
2781	`(lambda (args next-emfun)
2782	(declare (ignore next-emfun))
2783	(let ((,(%car lambda-list) (%car args))
2784	(,(%cadr lambda-list) (%cadr args)))
2785	(declare (ignorable ,(%car lambda-list)
2786	,(%cadr lambda-list)))
2787	,@declarations ,@body)))
2788	(3
2789	`(lambda (args next-emfun)
2790	(declare (ignore next-emfun))
2791	(let ((,(%car lambda-list) (%car args))
2792	(,(%cadr lambda-list) (%cadr args))
2793	(,(%caddr lambda-list) (%caddr args)))
2794	(declare (ignorable ,(%car lambda-list)
2795	,(%cadr lambda-list)
2796	,(%caddr lambda-list)))
2797	,@declarations ,@body)))
2798	(t
2799	`(lambda (args next-emfun)
2800	(declare (ignore next-emfun))
2801	(apply #'(lambda ,lambda-list ,@declarations ,@body) args)))))
2802	(t
2803	`(lambda (args next-emfun)
2804	(declare (ignore next-emfun))
2805	(apply #'(lambda ,lambda-list ,@declarations ,@body) args)))))))
2806
2807	(defun compute-method-fast-function (lambda-expression)
2808	(let ((lambda-list (allow-other-keys (cadr lambda-expression))))
2809	(when (intersection lambda-list '(&rest &optional &key &allow-other-keys &aux))
2810	(return-from compute-method-fast-function nil))
2811	;; Only required args.
2812	(let ((body (cddr lambda-expression))
2813	(call-next-method-p nil)
2814	(next-method-p-p nil))
2815	(multiple-value-bind (body declarations) (parse-body body)
2816	(walk-form body)
2817	(when (or call-next-method-p next-method-p-p)
2818	(return-from compute-method-fast-function nil))
2819	(let ((decls `(declare (ignorable ,@lambda-list))))
2820	(setf lambda-expression
2821	(list* (car lambda-expression)
2822	(cadr lambda-expression)
2823	decls
2824	(cddr lambda-expression))))
2825	(case (length lambda-list)
2826	(1
2827	;; `(lambda (args next-emfun)
2828	;; (let ((,(%car lambda-list) (%car args)))
2829	;; (declare (ignorable ,(%car lambda-list)))
2830	;; ,@declarations ,@body)))
2831	lambda-expression)
2832	(2
2833	;; `(lambda (args next-emfun)
2834	;; (let ((,(%car lambda-list) (%car args))
2835	;; (,(%cadr lambda-list) (%cadr args)))
2836	;; (declare (ignorable ,(%car lambda-list)
2837	;; ,(%cadr lambda-list)))
2838	;; ,@declarations ,@body)))
2839	lambda-expression)
2840	;; (3
2841	;; `(lambda (args next-emfun)
2842	;; (let ((,(%car lambda-list) (%car args))
2843	;; (,(%cadr lambda-list) (%cadr args))
2844	;; (,(%caddr lambda-list) (%caddr args)))
2845	;; (declare (ignorable ,(%car lambda-list)
2846	;; ,(%cadr lambda-list)
2847	;; ,(%caddr lambda-list)))
2848	;; ,@declarations ,@body)))
2849	(t
2850	nil))))))
2851
2852	(declaim (notinline make-method-lambda))
2853	(defun make-method-lambda (generic-function method lambda-expression env)
2854	(declare (ignore generic-function method env))
2855	(values (compute-method-function lambda-expression) nil))
2856
2857
2858	;; From CLHS section 7.6.5:
2859	;; "When a generic function or any of its methods mentions &key in a lambda
2860	;; list, the specific set of keyword arguments accepted by the generic function
2861	;; varies according to the applicable methods. The set of keyword arguments
2862	;; accepted by the generic function for a particular call is the union of the
2863	;; keyword arguments accepted by all applicable methods and the keyword
2864	;; arguments mentioned after &key in the generic function definition, if any."
2865	;; Adapted from Sacla.
2866	(defun allow-other-keys (lambda-list)
2867	(if (and (member '&key lambda-list)
2868	(not (member '&allow-other-keys lambda-list)))
2869	(let* ((key-end (or (position '&aux lambda-list) (length lambda-list)))
2870	(aux-part (subseq lambda-list key-end)))
2871	`(,@(subseq lambda-list 0 key-end) &allow-other-keys ,@aux-part))
2872	lambda-list))
2873
2874	(defmacro defmethod (&rest args &environment env)
2875	(multiple-value-bind
2876	(function-name qualifiers lambda-list specializers documentation declarations body)
2877	(parse-defmethod args)
2878	(let* ((specializers-form '())
2879	(lambda-expression `(lambda ,lambda-list ,@declarations ,body))
2880	(gf (or (find-generic-function function-name nil)
2881	(class-prototype (find-class 'standard-generic-function))))
2882	(method-function
2883	(make-method-lambda gf (class-prototype (generic-function-method-class gf))
2884	lambda-expression env))
2885	(fast-function (compute-method-fast-function lambda-expression))
2886	)
2887	(dolist (specializer specializers)
2888	(cond ((and (consp specializer) (eq (car specializer) 'eql))
2889	(push `(list 'eql ,(cadr specializer)) specializers-form))
2890	(t
2891	(push `',specializer specializers-form))))
2892	(setf specializers-form `(list ,@(nreverse specializers-form)))
2893	`(progn
2894	(ensure-method ',function-name
2895	:lambda-list ',lambda-list
2896	:qualifiers ',qualifiers
2897	:specializers (canonicalize-specializers ,specializers-form)
2898	,@(if documentation `(:documentation ,documentation))
2899	:function (function ,method-function)
2900	,@(if fast-function `(:fast-function (function ,fast-function)))
2901	)))))
2902
2903	;;; Reader and writer methods
2904
2905	(defun make-instance-standard-accessor-method (method-class
2906	&key
2907	lambda-list
2908	qualifiers
2909	specializers
2910	documentation
2911	function
2912	fast-function
2913	slot-definition)
2914	(let ((method (std-allocate-instance method-class)))
2915	(setf (method-lambda-list method) lambda-list)
2916	(setf (method-qualifiers method) qualifiers)
2917	(setf (std-slot-value method 'sys::specializers)
2918	(canonicalize-specializers specializers))
2919	(setf (method-documentation method) documentation)
2920	(setf (std-slot-value method 'sys::%generic-function) nil)
2921	(setf (std-slot-value method 'sys::%function) function)
2922	(setf (std-slot-value method 'sys::fast-function) fast-function)
2923	(setf (std-slot-value method 'sys::%slot-definition) slot-definition)
2924	(setf (std-slot-value method 'sys::keywords) nil)
2925	(setf (std-slot-value method 'sys::other-keywords-p) nil)
2926	method))
2927
2928	(defun add-reader-method (class function-name slot-definition)
2929	(let* ((slot-name (slot-definition-name slot-definition))
2930	(lambda-expression
2931	(if (std-class-p class)
2932	`(lambda (object) (std-slot-value object ',slot-name))
2933	`(lambda (object) (slot-value object ',slot-name))))
2934	(method-function (compute-method-function lambda-expression))
2935	(fast-function (compute-method-fast-function lambda-expression))
2936	(method-lambda-list '(object))
2937	(gf (find-generic-function function-name nil))
2938	(initargs `(:lambda-list ,method-lambda-list
2939	:qualifiers ()
2940	:specializers (,class)
2941	:function ,(if (autoloadp 'compile)
2942	method-function
2943	(autocompile method-function))
2944	:fast-function ,(if (autoloadp 'compile)
2945	fast-function
2946	(autocompile fast-function))
2947	:slot-definition ,slot-definition))
2948	(method-class (if (std-class-p class)
2949	+the-standard-reader-method-class+
2950	(apply #'reader-method-class class slot-definition
2951	initargs))))
2952	;; required by AMOP pg. 225
2953	(assert (subtypep method-class +the-standard-reader-method-class+))
2954	(if gf
2955	(check-method-lambda-list function-name
2956	method-lambda-list
2957	(generic-function-lambda-list gf))
2958	(setf gf (ensure-generic-function function-name
2959	:lambda-list method-lambda-list)))
2960	(let ((method
2961	(if (eq method-class +the-standard-reader-method-class+)
2962	(apply #'make-instance-standard-accessor-method method-class
2963	initargs)
2964	(apply #'make-instance method-class
2965	:generic-function nil ; handled by add-method
2966	initargs))))
2967	(if (std-generic-function-p gf)
2968	(progn
2969	(std-add-method gf method)
2970	(map-dependents gf
2971	#'(lambda (dep)
2972	(update-dependent gf dep 'add-method method))))
2973	(add-method gf method))
2974	method)))
2975
2976	(defun add-writer-method (class function-name slot-definition)
2977	(let* ((slot-name (slot-definition-name slot-definition))
2978	(lambda-expression
2979	(if (std-class-p class)
2980	`(lambda (new-value object)
2981	(setf (std-slot-value object ',slot-name) new-value))
2982	`(lambda (new-value object)
2983	(setf (slot-value object ',slot-name) new-value))))
2984	(method-function (compute-method-function lambda-expression))
2985	(fast-function (compute-method-fast-function lambda-expression))
2986	(method-lambda-list '(new-value object))
2987	(gf (find-generic-function function-name nil))
2988	(initargs `(:lambda-list ,method-lambda-list
2989	:qualifiers ()
2990	:specializers (,+the-T-class+ ,class)
2991	:function ,(if (autoloadp 'compile)
2992	method-function
2993	(autocompile method-function))
2994	:fast-function ,(if (autoloadp 'compile)
2995	fast-function
2996	(autocompile fast-function))
2997	:slot-definition ,slot-definition))
2998	(method-class (if (std-class-p class)
2999	+the-standard-writer-method-class+
3000	(apply #'writer-method-class class slot-definition
3001	initargs))))
3002	;; required by AMOP pg. 242
3003	(assert (subtypep method-class +the-standard-writer-method-class+))
3004	(if gf
3005	(check-method-lambda-list function-name
3006	method-lambda-list
3007	(generic-function-lambda-list gf))
3008	(setf gf (ensure-generic-function function-name
3009	:lambda-list method-lambda-list)))
3010	(let ((method
3011	(if (eq method-class +the-standard-writer-method-class+)
3012	(apply #'make-instance-standard-accessor-method method-class
3013	initargs)
3014	(apply #'make-instance method-class
3015	:generic-function nil ; handled by add-method
3016	initargs))))
3017	(if (std-generic-function-p gf)
3018	(progn
3019	(std-add-method gf method)
3020	(map-dependents gf
3021	#'(lambda (dep)
3022	(update-dependent gf dep 'add-method method))))
3023	(add-method gf method))
3024	method)))
3025
3026	(defmacro atomic-defgeneric (function-name &rest rest)
3027	"Macro to define a generic function and 'swap it into place' after
3028	it's been fully defined with all its methods.
3029
3030	Note: the user should really use the (:method ..) method description
3031	way of defining methods; there's not much use in atomically defining
3032	generic functions without providing sensible behaviour."
3033	(let ((temp-sym (gensym)))
3034	`(progn
3035	(defgeneric ,temp-sym ,@rest)
3036	(let ((gf (symbol-function ',temp-sym)))
3037	;; FIXME (rudi 2012-07-08): fset gets the source location info
3038	;; to charpos 23 always (but (setf fdefinition) leaves the
3039	;; outdated source position in place, which is even worse).
3040	(fset ',function-name gf)
3041	(setf (std-slot-value gf 'sys::name) ',function-name)
3042	(fmakunbound ',temp-sym)
3043	gf))))
3044
3045	(defmacro redefine-class-forwarder (name slot &optional body-alist)
3046	"Define a generic function on a temporary symbol as an accessor
3047	for the slot `slot'. Then, when definition is complete (including
3048	allocation of methods), swap the definition in place.
3049
3050	`body-alist' can be used to override the default method bodies for given
3051	metaclasses. In substitute method bodies, `class' names the class
3052	instance and, for setters, `new-value' the new value."
3053	(let* ((setterp (consp name))
3054	(%name
3055	(intern (concatenate 'string
3056	"%"
3057	(if setterp (symbol-name 'set-) "")
3058	(symbol-name (if setterp (cadr name) name)))
3059	(find-package "SYS")))
3060	(bodies
3061	(append body-alist
3062	(if setterp
3063	`((built-in-class . (,%name new-value class))
3064	(forward-referenced-class . (,%name new-value class))
3065	(structure-class . (,%name new-value class))
3066	(standard-class . (setf (slot-value class ',slot)
3067	new-value))
3068	(funcallable-standard-class . (setf (slot-value class ',slot)
3069	new-value)))
3070	`((built-in-class . (,%name class))
3071	(forward-referenced-class . (,%name class))
3072	(structure-class . (,%name class))
3073	(standard-class . (slot-value class ',slot))
3074	(funcallable-standard-class . (slot-value class ',slot)))))))
3075	`(atomic-defgeneric ,name (,@(when setterp (list 'new-value)) class)
3076	,@(mapcar #'(lambda (class-name)
3077	`(:method (,@(when setterp (list 'new-value))
3078	(class ,class-name))
3079	,(cdr (assoc class-name bodies))))
3080	'(built-in-class forward-referenced-class structure-class
3081	standard-class funcallable-standard-class)))))
3082
3083	;;; The slot names here must agree with the ones defined in
3084	;;; StandardClass.java:layoutStandardClass.
3085	(redefine-class-forwarder class-name sys:name)
3086	;;; AMOP pg. 230
3087	(redefine-class-forwarder (setf class-name) sys:name
3088	((standard-class . (progn (reinitialize-instance class :name new-value) new-value))
3089	(funcallable-standard-class . (progn (reinitialize-instance class :name new-value) new-value))))
3090	(redefine-class-forwarder class-slots sys:slots)
3091	(redefine-class-forwarder (setf class-slots) sys:slots)
3092	(redefine-class-forwarder class-direct-slots sys:direct-slots)
3093	(redefine-class-forwarder (setf class-direct-slots) sys:direct-slots)
3094	(redefine-class-forwarder class-layout sys:layout)
3095	(redefine-class-forwarder (setf class-layout) sys:layout)
3096	(redefine-class-forwarder class-direct-superclasses sys:direct-superclasses)
3097	(redefine-class-forwarder (setf class-direct-superclasses) sys:direct-superclasses)
3098	(redefine-class-forwarder class-direct-subclasses sys:direct-subclasses)
3099	(redefine-class-forwarder (setf class-direct-subclasses) sys:direct-subclasses)
3100	(redefine-class-forwarder class-direct-methods sys:direct-methods)
3101	(redefine-class-forwarder (setf class-direct-methods) sys:direct-methods)
3102	(redefine-class-forwarder class-precedence-list sys:precedence-list)
3103	(redefine-class-forwarder (setf class-precedence-list) sys:precedence-list)
3104	(redefine-class-forwarder class-finalized-p sys:finalized-p)
3105	(redefine-class-forwarder (setf class-finalized-p) sys:finalized-p)
3106	(redefine-class-forwarder class-default-initargs sys:default-initargs)
3107	(redefine-class-forwarder (setf class-default-initargs) sys:default-initargs)
3108	(redefine-class-forwarder class-direct-default-initargs sys:direct-default-initargs)
3109	(redefine-class-forwarder (setf class-direct-default-initargs) sys:direct-default-initargs)
3110
3111	;;; Class definition
3112
3113	(defun check-duplicate-slots (slots)
3114	(flet ((canonical-slot-name (canonical-slot)
3115	(getf canonical-slot :name)))
3116	(dolist (s1 slots)
3117	(let ((name1 (canonical-slot-name s1)))
3118	(dolist (s2 (cdr (memq s1 slots)))
3119	(when (eq name1 (canonical-slot-name s2))
3120	(error 'program-error "Duplicate slot ~S" name1)))))))
3121
3122	(defun check-duplicate-default-initargs (initargs)
3123	(let ((names ()))
3124	(dolist (initarg initargs)
3125	(push (car initarg) names))
3126	(do* ((names names (cdr names))
3127	(name (car names) (car names)))
3128	((null names))
3129	(when (memq name (cdr names))
3130	(error 'program-error
3131	:format-control "Duplicate initialization argument name ~S in :DEFAULT-INITARGS."
3132	:format-arguments (list name))))))
3133
3134	(defun canonicalize-direct-superclasses (direct-superclasses)
3135	(let ((classes '()))
3136	(dolist (class-specifier direct-superclasses)
3137	(let ((class (if (classp class-specifier)
3138	class-specifier
3139	(find-class class-specifier nil))))
3140	(unless class
3141	(setf class (make-instance +the-forward-referenced-class+
3142	:name class-specifier))
3143	(setf (find-class class-specifier) class))
3144	(when (and (typep class 'built-in-class)
3145	(not (member class extensible-built-in-classes)))
3146	(error "Attempt to define a subclass of built-in-class ~S."
3147	class-specifier))
3148	(push class classes)))
3149	(nreverse classes)))
3150
3151	(atomic-defgeneric add-direct-subclass (superclass subclass)
3152	(:method ((superclass class) (subclass class))
3153	(setf (class-direct-subclasses superclass)
3154	(adjoin subclass (class-direct-subclasses superclass)))))
3155
3156	(atomic-defgeneric remove-direct-subclass (superclass subclass)
3157	(:method ((superclass class) (subclass class))
3158	(setf (class-direct-subclasses superclass)
3159	(remove subclass (class-direct-subclasses superclass)))))
3160
3161	;;; AMOP pg. 182
3162	(defun ensure-class (name &rest all-keys &key &allow-other-keys)
3163	(let ((class (find-class name nil)))
3164	;; CLHS DEFCLASS: "If a class with the same proper name already
3165	;; exists [...] the existing class is redefined." Ansi-tests
3166	;; CLASS-0309 and CLASS-0310.1 demand this behavior.
3167	(if (and class (eql (class-name class) name))
3168	(apply #'ensure-class-using-class class name all-keys)
3169	(apply #'ensure-class-using-class nil name all-keys))))
3170
3171	;;; AMOP pg. 183ff.
3172	(defgeneric ensure-class-using-class (class name &key direct-default-initargs
3173	direct-slots direct-superclasses
3174	metaclass &allow-other-keys))
3175
3176	(defmethod ensure-class-using-class :before (class name &key direct-slots
3177	direct-default-initargs
3178	&allow-other-keys)
3179	(check-duplicate-slots direct-slots)
3180	(check-duplicate-default-initargs direct-default-initargs))
3181
3182	(defmethod ensure-class-using-class ((class null) name &rest all-keys
3183	&key (metaclass +the-standard-class+)
3184	direct-superclasses
3185	&allow-other-keys)
3186	(setf all-keys (copy-list all-keys)) ; since we modify it
3187	(remf all-keys :metaclass)
3188	(unless (classp metaclass) (setf metaclass (find-class metaclass)))
3189	(let ((class (apply (if (eq metaclass +the-standard-class+)
3190	#'make-instance-standard-class
3191	#'make-instance)
3192	metaclass :name name
3193	:direct-superclasses (canonicalize-direct-superclasses
3194	direct-superclasses)
3195	all-keys)))
3196	(%set-find-class name class)
3197	class))
3198
3199	(defmethod ensure-class-using-class ((class built-in-class) name &rest all-keys
3200	&key &allow-other-keys)
3201	(declare (ignore all-keys))
3202	(error "The symbol ~S names a built-in class." name))
3203
3204	(defmethod ensure-class-using-class ((class forward-referenced-class) name
3205	&rest all-keys
3206	&key (metaclass +the-standard-class+)
3207	direct-superclasses &allow-other-keys)
3208	(setf all-keys (copy-list all-keys)) ; since we modify it
3209	(remf all-keys :metaclass)
3210	(unless (classp metaclass) (setf metaclass (find-class metaclass)))
3211	(apply #'change-class class metaclass all-keys)
3212	(apply #'reinitialize-instance class
3213	:name name
3214	:direct-superclasses (canonicalize-direct-superclasses
3215	direct-superclasses)
3216	all-keys)
3217	class)
3218
3219	(defmethod ensure-class-using-class ((class class) name
3220	&rest all-keys
3221	&key (metaclass +the-standard-class+ metaclassp)
3222	direct-superclasses
3223	&allow-other-keys)
3224	(declare (ignore name))
3225	(setf all-keys (copy-list all-keys)) ; since we modify it
3226	(remf all-keys :metaclass)
3227	(unless (classp metaclass) (setf metaclass (find-class metaclass)))
3228	(when (and metaclassp (not (eq (class-of class) metaclass)))
3229	(error 'program-error
3230	"Trying to redefine class ~S with different metaclass."
3231	(class-name class)))
3232	(apply #'reinitialize-instance class
3233	:direct-superclasses (canonicalize-direct-superclasses direct-superclasses)
3234	all-keys)
3235	class)
3236
3237	(defmacro defclass (&whole form name direct-superclasses direct-slots &rest options)
3238	(unless (>= (length form) 3)
3239	(error 'program-error "Wrong number of arguments for DEFCLASS."))
3240	(check-declaration-type name)
3241	`(ensure-class ',name
3242	:direct-superclasses
3243	(canonicalize-direct-superclasses ',direct-superclasses)
3244	:direct-slots
3245	,(canonicalize-direct-slots direct-slots)
3246	,@(canonicalize-defclass-options options)))
3247
3248
3249	;;; AMOP pg. 180
3250	(defgeneric direct-slot-definition-class (class &rest initargs))
3251
3252	(defmethod direct-slot-definition-class ((class class) &rest initargs)
3253	(declare (ignore initargs))
3254	+the-standard-direct-slot-definition-class+)
3255
3256	;;; AMOP pg. 181
3257	(defgeneric effective-slot-definition-class (class &rest initargs))
3258
3259	(defmethod effective-slot-definition-class ((class class) &rest initargs)
3260	(declare (ignore initargs))
3261	+the-standard-effective-slot-definition-class+)
3262
3263	;;; AMOP pg. 224
3264	(defgeneric reader-method-class (class direct-slot &rest initargs))
3265
3266	(defmethod reader-method-class ((class standard-class)
3267	(direct-slot standard-direct-slot-definition)
3268	&rest initargs)
3269	(declare (ignore initargs))
3270	+the-standard-reader-method-class+)
3271
3272	(defmethod reader-method-class ((class funcallable-standard-class)
3273	(direct-slot standard-direct-slot-definition)
3274	&rest initargs)
3275	(declare (ignore initargs))
3276	+the-standard-reader-method-class+)
3277
3278	;;; AMOP pg. 242
3279	(defgeneric writer-method-class (class direct-slot &rest initargs))
3280
3281	(defmethod writer-method-class ((class standard-class)
3282	(direct-slot standard-direct-slot-definition)
3283	&rest initargs)
3284	(declare (ignore initargs))
3285	+the-standard-writer-method-class+)
3286
3287	(defmethod writer-method-class ((class funcallable-standard-class)
3288	(direct-slot standard-direct-slot-definition)
3289	&rest initargs)
3290	(declare (ignore initargs))
3291	+the-standard-writer-method-class+)
3292
3293	;;; Applicable methods
3294
3295	(atomic-defgeneric compute-applicable-methods (gf args)
3296	(:method ((gf standard-generic-function) args)
3297	(std-compute-applicable-methods gf args)))
3298
3299	(defgeneric compute-applicable-methods-using-classes (gf classes)
3300	(:method ((gf standard-generic-function) classes)
3301	(let ((methods '()))
3302	(dolist (method (generic-function-methods gf))
3303	(multiple-value-bind (applicable knownp)
3304	(method-applicable-using-classes-p method classes)
3305	(cond (applicable
3306	(push method methods))
3307	((not knownp)
3308	(return-from compute-applicable-methods-using-classes
3309	(values nil nil))))))
3310	(values (sort-methods methods gf classes)
3311	t))))
3312
3313
3314	;;; Slot access
3315	;;;
3316	;;; See AMOP pg. 156ff. for an overview.
3317	;;;
3318	;;; AMOP specifies these generic functions to dispatch on slot objects
3319	;;; (with the exception of slot-exists-p-using-class), although its
3320	;;; sample implementation Closette dispatches on slot names. We let
3321	;;; slot-value and friends call their gf counterparts with the effective
3322	;;; slot definition, but leave the definitions dispatching on slot name
3323	;;; in place for user convenience.
3324
3325	;;; AMOP pg. 235
3326	(defgeneric slot-value-using-class (class instance slot))
3327
3328	(defmethod slot-value-using-class ((class standard-class) instance (slot symbol))
3329	(std-slot-value instance slot))
3330	(defmethod slot-value-using-class ((class standard-class) instance
3331	(slot standard-effective-slot-definition))
3332	(let* ((location (slot-definition-location slot))
3333	(value (if (consp location)
3334	(cdr location) ; :allocation :class
3335	(standard-instance-access instance location))))
3336	(if (eq value +slot-unbound+)
3337	;; fix SLOT-UNBOUND.5 from ansi test suite
3338	(nth-value 0 (slot-unbound class instance (slot-definition-name slot)))
3339	value)))
3340
3341	(defmethod slot-value-using-class ((class funcallable-standard-class)
3342	instance (slot symbol))
3343	(std-slot-value instance slot))
3344	(defmethod slot-value-using-class ((class funcallable-standard-class) instance
3345	(slot standard-effective-slot-definition))
3346	(let* ((location (slot-definition-location slot))
3347	(value (if (consp location)
3348	(cdr location) ; :allocation :class
3349	(funcallable-standard-instance-access instance location))))
3350	(if (eq value +slot-unbound+)
3351	;; fix SLOT-UNBOUND.5 from ansi test suite
3352	(nth-value 0 (slot-unbound class instance (slot-definition-name slot)))
3353	value)))
3354
3355	(defmethod slot-value-using-class ((class structure-class) instance
3356	(slot symbol))
3357	(std-slot-value instance slot))
3358	(defmethod slot-value-using-class ((class structure-class) instance
3359	(slot standard-effective-slot-definition))
3360	(std-slot-value instance (slot-definition-name slot)))
3361
3362	;;; AMOP pg. 231
3363	(defgeneric (setf slot-value-using-class) (new-value class instance slot))
3364
3365	(defmethod (setf slot-value-using-class) (new-value
3366	(class standard-class)
3367	instance
3368	(slot symbol))
3369	(setf (std-slot-value instance slot) new-value))
3370	(defmethod (setf slot-value-using-class) (new-value
3371	(class standard-class)
3372	instance
3373	(slot standard-effective-slot-definition))
3374	(let ((location (slot-definition-location slot)))
3375	(if (consp location) ; :allocation :class
3376	(setf (cdr location) new-value)
3377	(setf (standard-instance-access instance location) new-value))))
3378
3379	(defmethod (setf slot-value-using-class) (new-value
3380	(class funcallable-standard-class)
3381	instance
3382	(slot symbol))
3383	(setf (std-slot-value instance slot) new-value))
3384	(defmethod (setf slot-value-using-class) (new-value
3385	(class funcallable-standard-class)
3386	instance
3387	(slot standard-effective-slot-definition))
3388	(let ((location (slot-definition-location slot)))
3389	(if (consp location) ; :allocation :class
3390	(setf (cdr location) new-value)
3391	(setf (funcallable-standard-instance-access instance location)
3392	new-value))))
3393
3394	(defmethod (setf slot-value-using-class) (new-value
3395	(class structure-class)
3396	instance
3397	(slot symbol))
3398	(setf (std-slot-value instance slot) new-value))
3399	(defmethod (setf slot-value-using-class) (new-value
3400	(class structure-class)
3401	instance
3402	(slot standard-effective-slot-definition))
3403	(setf (std-slot-value instance (slot-definition-name slot)) new-value))
3404
3405	;;; slot-exists-p-using-class is not specified by AMOP, and obviously
3406	;;; cannot be specialized on the slot type. Hence, its implementation
3407	;;; differs from slot-(boundp\|makunbound\|value)-using-class
3408	(defgeneric slot-exists-p-using-class (class instance slot-name))
3409
3410	(defmethod slot-exists-p-using-class (class instance slot-name)
3411	nil)
3412
3413	(defmethod slot-exists-p-using-class ((class standard-class) instance slot-name)
3414	(std-slot-exists-p instance slot-name))
3415	(defmethod slot-exists-p-using-class ((class funcallable-standard-class) instance slot-name)
3416	(std-slot-exists-p instance slot-name))
3417
3418	(defmethod slot-exists-p-using-class ((class structure-class) instance slot-name)
3419	(dolist (dsd (class-slots class))
3420	(when (eq (sys::dsd-name dsd) slot-name)
3421	(return-from slot-exists-p-using-class t)))
3422	nil)
3423
3424
3425	(defgeneric slot-boundp-using-class (class instance slot))
3426	(defmethod slot-boundp-using-class ((class standard-class) instance (slot symbol))
3427	(std-slot-boundp instance slot))
3428	(defmethod slot-boundp-using-class ((class standard-class) instance
3429	(slot standard-effective-slot-definition))
3430	(let ((location (slot-definition-location slot)))
3431	(if (consp location)
3432	(not (eq (cdr location) +slot-unbound+)) ; :allocation :class
3433	(not (eq (standard-instance-access instance location) +slot-unbound+)))))
3434
3435	(defmethod slot-boundp-using-class ((class funcallable-standard-class) instance
3436	(slot symbol))
3437	(std-slot-boundp instance slot))
3438	(defmethod slot-boundp-using-class ((class funcallable-standard-class) instance
3439	(slot standard-effective-slot-definition))
3440	(let ((location (slot-definition-location slot)))
3441	(if (consp location)
3442	(not (eq (cdr location) +slot-unbound+)) ; :allocation :class
3443	(not (eq (funcallable-standard-instance-access instance location)
3444	+slot-unbound+)))))
3445
3446	(defmethod slot-boundp-using-class ((class structure-class) instance slot)
3447	"Structure slots can't be unbound, so this method always returns T."
3448	(declare (ignore class instance slot))
3449	t)
3450
3451	(defgeneric slot-makunbound-using-class (class instance slot))
3452	(defmethod slot-makunbound-using-class ((class standard-class)
3453	instance
3454	(slot symbol))
3455	(std-slot-makunbound instance slot))
3456	(defmethod slot-makunbound-using-class ((class standard-class)
3457	instance
3458	(slot standard-effective-slot-definition))
3459	(let ((location (slot-definition-location slot)))
3460	(if (consp location)
3461	(setf (cdr location) +slot-unbound+)
3462	(setf (standard-instance-access instance location) +slot-unbound+))))
3463
3464	(defmethod slot-makunbound-using-class ((class funcallable-standard-class)
3465	instance
3466	(slot symbol))
3467	(std-slot-makunbound instance slot))
3468	(defmethod slot-makunbound-using-class ((class funcallable-standard-class)
3469	instance
3470	(slot symbol))
3471	(let ((location (slot-definition-location slot)))
3472	(if (consp location)
3473	(setf (cdr location) +slot-unbound+)
3474	(setf (funcallable-standard-instance-access instance location)
3475	+slot-unbound+))))
3476
3477	(defmethod slot-makunbound-using-class ((class structure-class)
3478	instance
3479	slot)
3480	(declare (ignore class instance slot))
3481	(error "Structure slots can't be unbound"))
3482
3483	(defgeneric slot-missing (class instance slot-name operation &optional new-value))
3484
3485	(defmethod slot-missing ((class t) instance slot-name operation &optional new-value)
3486	(declare (ignore new-value))
3487	(error "The slot ~S is missing from the class ~S." slot-name class))
3488
3489	(defgeneric slot-unbound (class instance slot-name))
3490
3491	(defmethod slot-unbound ((class t) instance slot-name)
3492	(error 'unbound-slot :instance instance :name slot-name))
3493
3494	;;; Instance creation and initialization
3495
3496	;;; AMOP pg. 168ff.
3497	(defgeneric allocate-instance (class &rest initargs &key &allow-other-keys))
3498
3499	(defmethod allocate-instance ((class standard-class) &rest initargs)
3500	(declare (ignore initargs))
3501	(std-allocate-instance class))
3502
3503	(defmethod allocate-instance ((class funcallable-standard-class) &rest initargs)
3504	(declare (ignore initargs))
3505	(allocate-funcallable-instance class))
3506
3507	(defmethod allocate-instance ((class structure-class) &rest initargs)
3508	(declare (ignore initargs))
3509	(%make-structure (class-name class)
3510	(make-list (length (class-slots class))
3511	:initial-element +slot-unbound+)))
3512
3513	(defmethod allocate-instance ((class built-in-class) &rest initargs)
3514	(declare (ignore initargs))
3515	(error "Cannot allocate instances of a built-in class: ~S" class))
3516
3517	(defmethod allocate-instance :before ((class class) &rest initargs)
3518	(declare (ignore initargs))
3519	(unless (class-finalized-p class)
3520	(finalize-inheritance class)))
3521
3522	;; "The set of valid initialization arguments for a class is the set of valid
3523	;; initialization arguments that either fill slots or supply arguments to
3524	;; methods, along with the predefined initialization argument :ALLOW-OTHER-KEYS."
3525	;; 7.1.2
3526
3527	(defun calculate-allowable-initargs (gf-list args instance
3528	shared-initialize-param
3529	initargs)
3530	(let* ((methods
3531	(nconc
3532	(std-compute-applicable-methods #'shared-initialize
3533	(list* instance
3534	shared-initialize-param
3535	initargs))
3536	(mapcan #'(lambda (gf)
3537	(if (std-generic-function-p gf)
3538	(std-compute-applicable-methods gf args)
3539	(compute-applicable-methods gf args)))
3540	gf-list)))
3541	(method-keyword-args
3542	(reduce #'merge-initargs-sets
3543	(mapcar #'method-lambda-list methods)
3544	:key #'extract-lambda-list-keywords
3545	:initial-value nil))
3546	(slots-initargs
3547	(mapappend #'slot-definition-initargs
3548	(class-slots (class-of instance)))))
3549	(merge-initargs-sets
3550	(merge-initargs-sets slots-initargs method-keyword-args)
3551	'(:allow-other-keys)))) ;; allow-other-keys is always allowed
3552
3553	(defun check-initargs (gf-list args instance
3554	shared-initialize-param initargs
3555	cache call-site)
3556	"Checks the validity of `initargs' for the generic functions in `gf-list'
3557	when called with `args' by calculating the applicable methods for each gf.
3558	The applicable methods for SHARED-INITIALIZE based on `instance',
3559	`shared-initialize-param' and `initargs' are added to the list of
3560	applicable methods."
3561	(when (oddp (length initargs))
3562	(error 'program-error
3563	:format-control "Odd number of keyword arguments."))
3564	(unless (getf initargs :allow-other-keys)
3565	(multiple-value-bind (allowable-initargs present-p)
3566	(when cache
3567	(gethash (class-of instance) cache))
3568	(unless present-p
3569	(setf allowable-initargs
3570	(calculate-allowable-initargs gf-list args instance
3571	shared-initialize-param initargs))
3572	(when cache
3573	(setf (gethash (class-of instance) cache)
3574	allowable-initargs)))
3575	(unless (eq t allowable-initargs)
3576	(do* ((tail initargs (cddr tail))
3577	(initarg (car tail) (car tail)))
3578	((null tail))
3579	(unless (memq initarg allowable-initargs)
3580	(error 'program-error
3581	:format-control "Invalid initarg ~S in call to ~S with arglist ~S."
3582	:format-arguments (list initarg call-site args))))))))
3583
3584	(defun merge-initargs-sets (list1 list2)
3585	(cond
3586	((eq list1 t) t)
3587	((eq list2 t) t)
3588	(t (union list1 list2))))
3589
3590	(defun extract-lambda-list-keywords (lambda-list)
3591	"Returns a list of keywords acceptable as keyword arguments,
3592	or T when any keyword is acceptable due to presence of
3593	&allow-other-keys."
3594	(when (member '&allow-other-keys lambda-list)
3595	(return-from extract-lambda-list-keywords t))
3596	(loop with keyword-args = (cdr (memq '&key lambda-list))
3597	for key in keyword-args
3598	when (eq key '&aux) do (loop-finish)
3599	when (eq key '&allow-other-keys) do (return t)
3600	when (listp key) do (setq key (car key))
3601	collect (if (symbolp key)
3602	(make-keyword key)
3603	(car key))))
3604
3605
3606	(defgeneric make-instance (class &rest initargs &key &allow-other-keys))
3607
3608	(defmethod make-instance :before ((class class) &rest initargs)
3609	(when (oddp (length initargs))
3610	(error 'program-error :format-control "Odd number of keyword arguments."))
3611	(unless (class-finalized-p class)
3612	(finalize-inheritance class)))
3613
3614	(defun augment-initargs-with-defaults (class initargs)
3615	(let ((default-initargs '()))
3616	(dolist (initarg (class-default-initargs class))
3617	(let ((key (first initarg))
3618	(fn (third initarg)))
3619	(when (eq (getf initargs key +slot-unbound+) +slot-unbound+)
3620	(push key default-initargs)
3621	(push (funcall fn) default-initargs))))
3622	(append initargs (nreverse default-initargs))))
3623
3624	(defmethod make-instance ((class standard-class) &rest initargs)
3625	(setf initargs (augment-initargs-with-defaults class initargs))
3626	(let ((instance (std-allocate-instance class)))
3627	(check-initargs (list #'allocate-instance #'initialize-instance)
3628	(list* instance initargs)
3629	instance t initargs
3630	make-instance-initargs-cache 'make-instance)
3631	(apply #'initialize-instance instance initargs)
3632	instance))
3633
3634	(defmethod make-instance ((class funcallable-standard-class) &rest initargs)
3635	(setf initargs (augment-initargs-with-defaults class initargs))
3636	(let ((instance (allocate-funcallable-instance class)))
3637	(check-initargs (list #'allocate-instance #'initialize-instance)
3638	(list* instance initargs)
3639	instance t initargs
3640	make-instance-initargs-cache 'make-instance)
3641	(apply #'initialize-instance instance initargs)
3642	instance))
3643
3644	(defmethod make-instance ((class symbol) &rest initargs)
3645	(apply #'make-instance (find-class class) initargs))
3646
3647	(defgeneric initialize-instance (instance &rest initargs
3648	&key &allow-other-keys))
3649
3650	(defmethod initialize-instance ((instance standard-object) &rest initargs)
3651	(apply #'shared-initialize instance t initargs))
3652
3653	(defgeneric reinitialize-instance (instance &rest initargs
3654	&key &allow-other-keys))
3655
3656	;; "The system-supplied primary method for REINITIALIZE-INSTANCE checks the
3657	;; validity of initargs and signals an error if an initarg is supplied that is
3658	;; not declared as valid. The method then calls the generic function SHARED-
3659	;; INITIALIZE with the following arguments: the instance, nil (which means no
3660	;; slots should be initialized according to their initforms), and the initargs
3661	;; it received."
3662	(defmethod reinitialize-instance ((instance standard-object) &rest initargs)
3663	(check-initargs (list #'reinitialize-instance) (list* instance initargs)
3664	instance () initargs
3665	reinitialize-instance-initargs-cache 'reinitialize-instance)
3666	(apply #'shared-initialize instance () initargs))
3667
3668	(defun std-shared-initialize (instance slot-names all-keys)
3669	(when (oddp (length all-keys))
3670	(error 'program-error :format-control "Odd number of keyword arguments."))
3671	;; do a quick scan of the arguments list to see if it's a real
3672	;; 'initialization argument list' (which is not the same as
3673	;; checking initarg validity
3674	(do* ((tail all-keys (cddr tail))
3675	(initarg (car tail) (car tail)))
3676	((null tail))
3677	(unless (symbolp initarg)
3678	(error 'program-error
3679	:format-control "Initarg ~S not a symbol."
3680	:format-arguments (list initarg))))
3681	(dolist (slot (class-slots (class-of instance)))
3682	(let ((slot-name (slot-definition-name slot)))
3683	(multiple-value-bind (init-key init-value foundp)
3684	(get-properties all-keys (slot-definition-initargs slot))
3685	(if foundp
3686	(setf (std-slot-value instance slot-name) init-value)
3687	(unless (std-slot-boundp instance slot-name)
3688	(let ((initfunction (slot-definition-initfunction slot)))
3689	(when (and initfunction (or (eq slot-names t)
3690	(memq slot-name slot-names)))
3691	(setf (std-slot-value instance slot-name)
3692	(funcall initfunction)))))))))
3693	instance)
3694
3695	(defgeneric shared-initialize (instance slot-names
3696	&rest initargs
3697	&key &allow-other-keys))
3698
3699	(defmethod shared-initialize ((instance standard-object) slot-names
3700	&rest initargs)
3701	(std-shared-initialize instance slot-names initargs))
3702
3703	(defmethod shared-initialize ((slot slot-definition) slot-names
3704	&rest args
3705	&key name initargs initform initfunction
3706	readers writers allocation
3707	&allow-other-keys)
3708	;;Keyword args are duplicated from init-slot-definition only to have
3709	;;them checked.
3710	(declare (ignore slot-names)) ;;TODO?
3711	(declare (ignore name initargs initform initfunction readers writers allocation))
3712	;;For built-in slots
3713	(apply #'init-slot-definition slot :allow-other-keys t args)
3714	;;For user-defined slots
3715	(call-next-method))
3716
3717	;;; change-class
3718
3719	(defgeneric change-class (instance new-class &key &allow-other-keys))
3720
3721	(defmethod change-class ((old-instance standard-object) (new-class standard-class)
3722	&rest initargs)
3723	(let ((old-slots (class-slots (class-of old-instance)))
3724	(new-slots (class-slots new-class))
3725	(new-instance (allocate-instance new-class)))
3726	;; "The values of local slots specified by both the class CTO and the class
3727	;; CFROM are retained. If such a local slot was unbound, it remains
3728	;; unbound."
3729	(dolist (new-slot new-slots)
3730	(when (instance-slot-p new-slot)
3731	(let* ((slot-name (slot-definition-name new-slot))
3732	(old-slot (find slot-name old-slots :key 'slot-definition-name)))
3733	;; "The values of slots specified as shared in the class CFROM and as
3734	;; local in the class CTO are retained."
3735	(when (and old-slot (slot-boundp old-instance slot-name))
3736	(setf (slot-value new-instance slot-name)
3737	(slot-value old-instance slot-name))))))
3738	(swap-slots old-instance new-instance)
3739	(rotatef (std-instance-layout new-instance)
3740	(std-instance-layout old-instance))
3741	(apply #'update-instance-for-different-class
3742	new-instance old-instance initargs)
3743	old-instance))
3744
3745	(defmethod change-class ((instance standard-object) (new-class symbol) &rest initargs)
3746	(apply #'change-class instance (find-class new-class) initargs))
3747
3748	(defgeneric update-instance-for-different-class (old new
3749	&rest initargs
3750	&key &allow-other-keys))
3751
3752	(defmethod update-instance-for-different-class
3753	((old standard-object) (new standard-object) &rest initargs)
3754	(let ((added-slots
3755	(remove-if #'(lambda (slot-name)
3756	(slot-exists-p old slot-name))
3757	(mapcar 'slot-definition-name
3758	(class-slots (class-of new))))))
3759	(check-initargs (list #'update-instance-for-different-class)
3760	(list old new initargs)
3761	new added-slots initargs
3762	nil 'update-instance-for-different-class)
3763	(apply #'shared-initialize new added-slots initargs)))
3764
3765	;;; make-instances-obsolete
3766
3767	(defgeneric make-instances-obsolete (class))
3768
3769	(defmethod make-instances-obsolete ((class standard-class))
3770	(%make-instances-obsolete class))
3771	(defmethod make-instances-obsolete ((class funcallable-standard-class))
3772	(%make-instances-obsolete class))
3773	(defmethod make-instances-obsolete ((class symbol))
3774	(make-instances-obsolete (find-class class))
3775	class)
3776
3777	;;; update-instance-for-redefined-class
3778
3779	(defgeneric update-instance-for-redefined-class (instance
3780	added-slots
3781	discarded-slots
3782	property-list
3783	&rest initargs
3784	&key
3785	&allow-other-keys))
3786
3787	(defmethod update-instance-for-redefined-class ((instance standard-object)
3788	added-slots
3789	discarded-slots
3790	property-list
3791	&rest initargs)
3792	(check-initargs (list #'update-instance-for-redefined-class)
3793	(list* instance added-slots discarded-slots
3794	property-list initargs)
3795	instance added-slots initargs
3796	nil 'update-instance-for-redefined-class)
3797	(apply #'shared-initialize instance added-slots initargs))
3798
3799	;;; Methods having to do with class metaobjects.
3800
3801	(defmethod initialize-instance :after ((class standard-class) &rest args)
3802	(apply #'std-after-initialization-for-classes class args))
3803
3804	(defmethod initialize-instance :after ((class funcallable-standard-class)
3805	&rest args)
3806	(apply #'std-after-initialization-for-classes class args))
3807
3808	(defmethod reinitialize-instance :before ((class standard-class)
3809	&rest all-keys
3810	&key direct-superclasses)
3811	(check-initargs (list #'allocate-instance
3812	#'initialize-instance)
3813	(list* class all-keys)
3814	class t all-keys
3815	nil 'reinitialize-instance)
3816	(dolist (superclass (set-difference (class-direct-superclasses class)
3817	direct-superclasses))
3818	(remove-direct-subclass superclass class))
3819	(dolist (superclass (set-difference direct-superclasses
3820	(class-direct-superclasses class)))
3821	(add-direct-subclass superclass class)))
3822
3823	(defmethod reinitialize-instance :before ((class funcallable-standard-class)
3824	&rest all-keys
3825	&key direct-superclasses)
3826	(check-initargs (list #'allocate-instance
3827	#'initialize-instance)
3828	(list* class all-keys)
3829	class t all-keys
3830	nil 'reinitialize-instance)
3831	(dolist (superclass (set-difference (class-direct-superclasses class)
3832	direct-superclasses))
3833	(remove-direct-subclass superclass class))
3834	(dolist (superclass (set-difference direct-superclasses
3835	(class-direct-superclasses class)))
3836	(add-direct-subclass superclass class)))
3837
3838	(defun std-after-reinitialization-for-classes (class
3839	&rest all-keys
3840	&key (direct-superclasses nil direct-superclasses-p)
3841	(direct-slots nil direct-slots-p)
3842	(direct-default-initargs nil direct-default-initargs-p)
3843	&allow-other-keys)
3844	(remhash class make-instance-initargs-cache)
3845	(remhash class reinitialize-instance-initargs-cache)
3846	(%make-instances-obsolete class)
3847	(setf (class-finalized-p class) nil)
3848	(when direct-superclasses-p
3849	(let* ((old-supers (class-direct-superclasses class))
3850	(new-supers (canonicalize-direct-superclass-list
3851	class direct-superclasses)))
3852	(setf (class-direct-superclasses class) new-supers)
3853	(dolist (old-superclass (set-difference old-supers new-supers))
3854	(remove-direct-subclass old-superclass class))
3855	(dolist (new-superclass (set-difference new-supers old-supers))
3856	(add-direct-subclass new-superclass class))))
3857	(when direct-slots-p
3858	;; FIXME: maybe remove old reader and writer methods?
3859	(let ((slots (mapcar #'(lambda (slot-properties)
3860	(apply #'make-direct-slot-definition class slot-properties))
3861	direct-slots)))
3862	(setf (class-direct-slots class) slots)
3863	(dolist (direct-slot slots)
3864	(dolist (reader (slot-definition-readers direct-slot))
3865	(add-reader-method class reader direct-slot))
3866	(dolist (writer (slot-definition-writers direct-slot))
3867	(add-writer-method class writer direct-slot)))))
3868	(when direct-default-initargs-p
3869	(setf (class-direct-default-initargs class) direct-default-initargs))
3870	(maybe-finalize-class-subtree class)
3871	(map-dependents class #'(lambda (dep) (update-dependent class dep all-keys))))
3872
3873	(defmethod reinitialize-instance :after ((class standard-class)
3874	&rest all-keys)
3875	(apply #'std-after-reinitialization-for-classes class all-keys))
3876
3877	(defmethod reinitialize-instance :after ((class funcallable-standard-class)
3878	&rest all-keys)
3879	(apply #'std-after-reinitialization-for-classes class all-keys))
3880
3881	(defmethod reinitialize-instance :before ((gf standard-generic-function)
3882	&key
3883	(lambda-list nil lambda-list-supplied-p)
3884	&allow-other-keys)
3885	(when lambda-list-supplied-p
3886	(unless (or (null (generic-function-methods gf))
3887	(lambda-lists-congruent-p lambda-list
3888	(generic-function-lambda-list gf)))
3889	(error "The lambda list ~S is incompatible with the existing methods of ~S."
3890	lambda-list gf))))
3891
3892	(defmethod reinitialize-instance :after ((gf standard-generic-function)
3893	&rest all-keys)
3894	(map-dependents gf #'(lambda (dep) (update-dependent gf dep all-keys))))
3895
3896	;;; Finalize inheritance
3897
3898	(atomic-defgeneric finalize-inheritance (class)
3899	(:method ((class standard-class))
3900	(std-finalize-inheritance class))
3901	(:method ((class funcallable-standard-class))
3902	(std-finalize-inheritance class)))
3903
3904	;;; Default initargs
3905
3906	;;; AMOP pg. 174
3907	(atomic-defgeneric compute-default-initargs (class)
3908	(:method ((class standard-class))
3909	(std-compute-default-initargs class))
3910	(:method ((class funcallable-standard-class))
3911	(std-compute-default-initargs class)))
3912
3913	;;; Class precedence lists
3914
3915	(defgeneric compute-class-precedence-list (class))
3916	(defmethod compute-class-precedence-list ((class standard-class))
3917	(std-compute-class-precedence-list class))
3918	(defmethod compute-class-precedence-list ((class funcallable-standard-class))
3919	(std-compute-class-precedence-list class))
3920
3921	;;; Slot inheritance
3922
3923	(defgeneric compute-slots (class))
3924	(defmethod compute-slots ((class standard-class))
3925	(std-compute-slots class))
3926	(defmethod compute-slots ((class funcallable-standard-class))
3927	(std-compute-slots class))
3928
3929	(defgeneric compute-effective-slot-definition (class name direct-slots))
3930	(defmethod compute-effective-slot-definition
3931	((class standard-class) name direct-slots)
3932	(std-compute-effective-slot-definition class name direct-slots))
3933	(defmethod compute-effective-slot-definition
3934	((class funcallable-standard-class) name direct-slots)
3935	(std-compute-effective-slot-definition class name direct-slots))
3936
3937	;;; Methods having to do with generic function invocation.
3938
3939	(defgeneric compute-discriminating-function (gf))
3940	(defmethod compute-discriminating-function ((gf standard-generic-function))
3941	(std-compute-discriminating-function gf))
3942
3943	(defgeneric method-more-specific-p (gf method1 method2 required-classes))
3944
3945	(defmethod method-more-specific-p ((gf standard-generic-function)
3946	method1 method2 required-classes)
3947	(let ((method-indices
3948	(argument-precedence-order-indices
3949	(generic-function-argument-precedence-order gf)
3950	(getf (analyze-lambda-list (generic-function-lambda-list gf))
3951	':required-args))))
3952	(std-method-more-specific-p method1 method2 required-classes method-indices)))
3953
3954	;;; AMOP pg. 176
3955	(defgeneric compute-effective-method (gf method-combination methods))
3956	(defmethod compute-effective-method ((gf standard-generic-function) method-combination methods)
3957	(std-compute-effective-method gf method-combination methods))
3958
3959	(defgeneric compute-applicable-methods (gf args))
3960	(defmethod compute-applicable-methods ((gf standard-generic-function) args)
3961	(std-compute-applicable-methods gf args))
3962
3963	;;; AMOP pg. 207
3964	(atomic-defgeneric make-method-lambda (generic-function method lambda-expression environment)
3965	(:method ((generic-function standard-generic-function)
3966	(method standard-method)
3967	lambda-expression environment)
3968	(declare (ignore environment))
3969	(values (compute-method-function lambda-expression) nil)))
3970
3971
3972	;;; Slot definition accessors
3973
3974	(defmacro slot-definition-dispatch (slot-definition std-form generic-form)
3975	`(let (($cl (class-of ,slot-definition)))
3976	(case $cl
3977	((+the-standard-slot-definition-class+
3978	+the-standard-direct-slot-definition-class+
3979	+the-standard-effective-slot-definition-class+)
3980	,std-form)
3981	(t ,generic-form))))
3982
3983	(atomic-defgeneric slot-definition-allocation (slot-definition)
3984	(:method ((slot-definition slot-definition))
3985	(slot-definition-dispatch slot-definition
3986	(std-slot-value slot-definition 'sys::allocation)
3987	(slot-value slot-definition 'sys::allocation))))
3988
3989	(atomic-defgeneric (setf slot-definition-allocation) (value slot-definition)
3990	(:method (value (slot-definition slot-definition))
3991	(slot-definition-dispatch slot-definition
3992	(setf (std-slot-value slot-definition 'sys::allocation) value)
3993	(setf (slot-value slot-definition 'sys::allocation) value))))
3994
3995	(atomic-defgeneric slot-definition-initargs (slot-definition)
3996	(:method ((slot-definition slot-definition))
3997	(slot-definition-dispatch slot-definition
3998	(std-slot-value slot-definition 'sys::initargs)
3999	(slot-value slot-definition 'sys::initargs))))
4000
4001	(atomic-defgeneric (setf slot-definition-initargs) (value slot-definition)
4002	(:method (value (slot-definition slot-definition))
4003	(slot-definition-dispatch slot-definition
4004	(setf (std-slot-value slot-definition 'sys::initargs) value)
4005	(setf (slot-value slot-definition 'sys::initargs) value))))
4006
4007	(atomic-defgeneric slot-definition-initform (slot-definition)
4008	(:method ((slot-definition slot-definition))
4009	(slot-definition-dispatch slot-definition
4010	(std-slot-value slot-definition 'sys::initform)
4011	(slot-value slot-definition 'sys::initform))))
4012
4013	(atomic-defgeneric (setf slot-definition-initform) (value slot-definition)
4014	(:method (value (slot-definition slot-definition))
4015	(slot-definition-dispatch slot-definition
4016	(setf (std-slot-value slot-definition 'sys::initform) value)
4017	(setf (slot-value slot-definition 'sys::initform) value))))
4018
4019	(atomic-defgeneric slot-definition-initfunction (slot-definition)
4020	(:method ((slot-definition slot-definition))
4021	(slot-definition-dispatch slot-definition
4022	(std-slot-value slot-definition 'sys::initfunction)
4023	(slot-value slot-definition 'sys::initfunction))))
4024
4025	(atomic-defgeneric (setf slot-definition-initfunction) (value slot-definition)
4026	(:method (value (slot-definition slot-definition))
4027	(slot-definition-dispatch slot-definition
4028	(setf (std-slot-value slot-definition 'sys::initfunction) value)
4029	(setf (slot-value slot-definition 'sys::initfunction) value))))
4030
4031	(atomic-defgeneric slot-definition-name (slot-definition)
4032	(:method ((slot-definition slot-definition))
4033	(slot-definition-dispatch slot-definition
4034	(std-slot-value slot-definition 'sys:name)
4035	(slot-value slot-definition 'sys:name))))
4036
4037	(atomic-defgeneric (setf slot-definition-name) (value slot-definition)
4038	(:method (value (slot-definition slot-definition))
4039	(slot-definition-dispatch slot-definition
4040	(setf (std-slot-value slot-definition 'sys:name) value)
4041	(setf (slot-value slot-definition 'sys:name) value))))
4042
4043	(atomic-defgeneric slot-definition-readers (slot-definition)
4044	(:method ((slot-definition slot-definition))
4045	(slot-definition-dispatch slot-definition
4046	(std-slot-value slot-definition 'sys::readers)
4047	(slot-value slot-definition 'sys::readers))))
4048
4049	(atomic-defgeneric (setf slot-definition-readers) (value slot-definition)
4050	(:method (value (slot-definition slot-definition))
4051	(slot-definition-dispatch slot-definition
4052	(setf (std-slot-value slot-definition 'sys::readers) value)
4053	(setf (slot-value slot-definition 'sys::readers) value))))
4054
4055	(atomic-defgeneric slot-definition-writers (slot-definition)
4056	(:method ((slot-definition slot-definition))
4057	(slot-definition-dispatch slot-definition
4058	(std-slot-value slot-definition 'sys::writers)
4059	(slot-value slot-definition 'sys::writers))))
4060
4061	(atomic-defgeneric (setf slot-definition-writers) (value slot-definition)
4062	(:method (value (slot-definition slot-definition))
4063	(slot-definition-dispatch slot-definition
4064	(setf (std-slot-value slot-definition 'sys::writers) value)
4065	(setf (slot-value slot-definition 'sys::writers) value))))
4066
4067	(atomic-defgeneric slot-definition-allocation-class (slot-definition)
4068	(:method ((slot-definition slot-definition))
4069	(slot-definition-dispatch slot-definition
4070	(std-slot-value slot-definition 'sys::allocation-class)
4071	(slot-value slot-definition 'sys::allocation-class))))
4072
4073	(atomic-defgeneric (setf slot-definition-allocation-class)
4074	(value slot-definition)
4075	(:method (value (slot-definition slot-definition))
4076	(slot-definition-dispatch slot-definition
4077	(setf (std-slot-value slot-definition 'sys::allocation-class) value)
4078	(setf (slot-value slot-definition 'sys::allocation-class) value))))
4079
4080	(atomic-defgeneric slot-definition-location (slot-definition)
4081	(:method ((slot-definition slot-definition))
4082	(slot-definition-dispatch slot-definition
4083	(std-slot-value slot-definition 'sys::location)
4084	(slot-value slot-definition 'sys::location))))
4085
4086	(atomic-defgeneric (setf slot-definition-location) (value slot-definition)
4087	(:method (value (slot-definition slot-definition))
4088	(slot-definition-dispatch slot-definition
4089	(setf (std-slot-value slot-definition 'sys::location) value)
4090	(setf (slot-value slot-definition 'sys::location) value))))
4091
4092	(atomic-defgeneric slot-definition-type (slot-definition)
4093	(:method ((slot-definition slot-definition))
4094	(slot-definition-dispatch slot-definition
4095	(std-slot-value slot-definition 'sys::%type)
4096	(slot-value slot-definition 'sys::%type))))
4097
4098	(atomic-defgeneric (setf slot-definition-type) (value slot-definition)
4099	(:method (value (slot-definition slot-definition))
4100	(slot-definition-dispatch slot-definition
4101	(setf (std-slot-value slot-definition 'sys::%type) value)
4102	(setf (slot-value slot-definition 'sys::%type) value))))
4103
4104	(atomic-defgeneric slot-definition-documentation (slot-definition)
4105	(:method ((slot-definition slot-definition))
4106	(slot-definition-dispatch slot-definition
4107	(std-slot-value slot-definition 'sys:%documentation)
4108	(slot-value slot-definition 'sys:%documentation))))
4109
4110	(atomic-defgeneric (setf slot-definition-documentation) (value slot-definition)
4111	(:method (value (slot-definition slot-definition))
4112	(slot-definition-dispatch slot-definition
4113	(setf (std-slot-value slot-definition 'sys:%documentation) value)
4114	(setf (slot-value slot-definition 'sys:%documentation) value))))
4115
4116
4117	;;; Conditions.
4118
4119	(defmacro define-condition (name (&rest parent-types) (&rest slot-specs) &body options)
4120	(let ((parent-types (or parent-types '(condition)))
4121	(report nil))
4122	(dolist (option options)
4123	(when (eq (car option) :report)
4124	(setf report (cadr option))
4125	(setf options (delete option options :test #'equal))
4126	(return)))
4127	(typecase report
4128	(null
4129	`(progn
4130	(defclass ,name ,parent-types ,slot-specs ,@options)
4131	',name))
4132	(string
4133	`(progn
4134	(defclass ,name ,parent-types ,slot-specs ,@options)
4135	(defmethod print-object ((condition ,name) stream)
4136	(if print-escape
4137	(call-next-method)
4138	(progn (write-string ,report stream) condition)))
4139	',name))
4140	(t
4141	`(progn
4142	(defclass ,name ,parent-types ,slot-specs ,@options)
4143	(defmethod print-object ((condition ,name) stream)
4144	(if print-escape
4145	(call-next-method)
4146	(funcall #',report condition stream)))
4147	',name)))))
4148
4149	(defun make-condition (type &rest initargs)
4150	(or (%make-condition type initargs)
4151	(let ((class (if (symbolp type) (find-class type) type)))
4152	(apply #'make-instance class initargs))))
4153
4154	;; Adapted from SBCL.
4155	;; Originally defined in signal.lisp. Redefined here now that we have MAKE-CONDITION.
4156	(defun coerce-to-condition (datum arguments default-type fun-name)
4157	(cond ((typep datum 'condition)
4158	(when arguments
4159	(error 'simple-type-error
4160	:datum arguments
4161	:expected-type 'null
4162	:format-control "You may not supply additional arguments when giving ~S to ~S."
4163	:format-arguments (list datum fun-name)))
4164	datum)
4165	((symbolp datum)
4166	(apply #'make-condition datum arguments))
4167	((or (stringp datum) (functionp datum))
4168	(make-condition default-type
4169	:format-control datum
4170	:format-arguments arguments))
4171	(t
4172	(error 'simple-type-error
4173	:datum datum
4174	:expected-type '(or symbol string)
4175	:format-control "Bad argument to ~S: ~S."
4176	:format-arguments (list fun-name datum)))))
4177
4178	(defgeneric make-load-form (object &optional environment))
4179
4180	(defmethod make-load-form ((object t) &optional environment)
4181	(declare (ignore environment))
4182	(apply #'no-applicable-method #'make-load-form (list object)))
4183
4184	(defmethod make-load-form ((class class) &optional environment)
4185	(declare (ignore environment))
4186	(let ((name (class-name class)))
4187	(unless (and name (eq (find-class name nil) class))
4188	(error 'simple-type-error
4189	:format-control "Can't use anonymous or undefined class as a constant: ~S."
4190	:format-arguments (list class)))
4191	`(find-class ',name)))
4192
4193	(defun invalid-method-error (method format-control &rest args)
4194	(let ((message (apply #'format nil format-control args)))
4195	(error "Invalid method error for ~S:~% ~A" method message)))
4196
4197	(defun method-combination-error (format-control &rest args)
4198	(let ((message (apply #'format nil format-control args)))
4199	(error "Method combination error in CLOS dispatch:~% ~A" message)))
4200
4201
4202	(atomic-defgeneric no-applicable-method (generic-function &rest args)
4203	(:method (generic-function &rest args)
4204	(error "There is no applicable method for the generic function ~S ~
4205	when called with arguments ~S."
4206	generic-function
4207	args)))
4208
4209
4210	;;; FIXME (rudi 2012-01-28): this can be a function, it only needs to
4211	;;; use standard accessor functions
4212	(defgeneric find-method (generic-function
4213	qualifiers
4214	specializers
4215	&optional errorp))
4216
4217	(defmethod find-method ((generic-function standard-generic-function)
4218	qualifiers specializers &optional (errorp t))
4219	(%find-method generic-function qualifiers specializers errorp))
4220
4221	(defgeneric find-method ((generic-function symbol)
4222	qualifiers specializers &optional (errorp t))
4223	(find-method (find-generic-function generic-function errorp)
4224	qualifiers specializers errorp))
4225
4226	;;; AMOP pg. 167
4227	(defgeneric add-method (generic-function method))
4228
4229	(defmethod add-method :before ((generic-function generic-function)
4230	(method method))
4231	(when (and (method-generic-function method)
4232	(not (eql generic-function (method-generic-function method))))
4233	(error 'simple-error
4234	:format-control "~S is already a method of ~S, cannot add to ~S."
4235	:format-arguments (list method (method-generic-function method)
4236	generic-function)))
4237	(check-method-lambda-list (generic-function-name generic-function)
4238	(method-lambda-list method)
4239	(generic-function-lambda-list generic-function)))
4240
4241	(defmethod add-method ((generic-function standard-generic-function)
4242	(method standard-method))
4243	(std-add-method generic-function method))
4244
4245	(defmethod add-method :after ((generic-function generic-function)
4246	(method method))
4247	(map-dependents generic-function
4248	#'(lambda (dep) (update-dependent generic-function dep
4249	'add-method method))))
4250
4251	(defgeneric remove-method (generic-function method))
4252
4253	(defmethod remove-method ((generic-function standard-generic-function)
4254	(method standard-method))
4255	(std-remove-method generic-function method))
4256
4257	(defmethod remove-method :after ((generic-function generic-function)
4258	(method method))
4259	(map-dependents generic-function
4260	#'(lambda (dep) (update-dependent generic-function dep
4261	'remove-method method))))
4262
4263	;; See describe.lisp.
4264	(defgeneric describe-object (object stream))
4265
4266	;; FIXME
4267	(defgeneric no-next-method (generic-function method &rest args))
4268
4269	(atomic-defgeneric function-keywords (method)
4270	(:method ((method standard-method))
4271	(std-function-keywords method)))
4272
4273	(setf gf-initialize-instance (symbol-function 'initialize-instance))
4274	(setf gf-allocate-instance (symbol-function 'allocate-instance))
4275	(setf gf-shared-initialize (symbol-function 'shared-initialize))
4276	(setf gf-reinitialize-instance (symbol-function 'reinitialize-instance))
4277	(setf clos-booting nil)
4278
4279	(atomic-defgeneric class-prototype (class)
4280	(:method ((class standard-class))
4281	(allocate-instance class))
4282	(:method ((class funcallable-standard-class))
4283	(allocate-instance class))
4284	(:method ((class structure-class))
4285	(allocate-instance class))
4286	(:method :before (class)
4287	(unless (class-finalized-p class)
4288	(error "~@<~S is not finalized.~:@>" class))))
4289
4290
4291
4292
4293
4294	(defmethod shared-initialize :before ((instance generic-function)
4295	slot-names
4296	&key lambda-list argument-precedence-order
4297	&allow-other-keys)
4298	(check-argument-precedence-order lambda-list argument-precedence-order))
4299
4300	(defmethod shared-initialize :after ((instance standard-generic-function)
4301	slot-names
4302	&key lambda-list argument-precedence-order
4303	(method-combination '(standard))
4304	&allow-other-keys)
4305	(let* ((plist (analyze-lambda-list lambda-list))
4306	(required-args (getf plist ':required-args)))
4307	(setf (std-slot-value instance 'sys::required-args) required-args)
4308	(setf (std-slot-value instance 'sys::optional-args)
4309	(getf plist :optional-args))
4310	(setf (std-slot-value instance 'sys::argument-precedence-order)
4311	(or argument-precedence-order required-args)))
4312	(unless (typep (generic-function-method-combination instance)
4313	'method-combination)
4314	;; this fixes (make-instance 'standard-generic-function) -- the
4315	;; constructor of StandardGenericFunction sets this slot to '(standard)
4316	(setf (std-slot-value instance 'sys::%method-combination)
4317	(find-method-combination
4318	instance (car method-combination) (cdr method-combination))))
4319	(finalize-standard-generic-function instance))
4320
4321	;;; Readers for generic function metaobjects
4322	;;; AMOP pg. 216ff.
4323	(atomic-defgeneric generic-function-argument-precedence-order (generic-function)
4324	(:method ((generic-function standard-generic-function))
4325	(std-slot-value generic-function 'sys::argument-precedence-order)))
4326
4327	(atomic-defgeneric generic-function-declarations (generic-function)
4328	(:method ((generic-function standard-generic-function))
4329	(std-slot-value generic-function 'sys::declarations)))
4330
4331	(atomic-defgeneric generic-function-lambda-list (generic-function)
4332	(:method ((generic-function standard-generic-function))
4333	(std-slot-value generic-function 'sys::lambda-list)))
4334
4335	(atomic-defgeneric generic-function-method-class (generic-function)
4336	(:method ((generic-function standard-generic-function))
4337	(std-slot-value generic-function 'sys::method-class)))
4338
4339	(atomic-defgeneric generic-function-method-combination (generic-function)
4340	(:method ((generic-function standard-generic-function))
4341	(std-slot-value generic-function 'sys::%method-combination)))
4342
4343	(atomic-defgeneric generic-function-methods (generic-function)
4344	(:method ((generic-function standard-generic-function))
4345	(std-slot-value generic-function 'sys::methods)))
4346
4347	(atomic-defgeneric generic-function-name (generic-function)
4348	(:method ((generic-function standard-generic-function))
4349	(slot-value generic-function 'sys::name)))
4350
4351	(atomic-defgeneric generic-function-required-arguments (generic-function)
4352	(:method ((generic-function standard-generic-function))
4353	(std-slot-value generic-function 'sys::required-args)))
4354
4355	(atomic-defgeneric generic-function-optional-arguments (generic-function)
4356	(:method ((generic-function standard-generic-function))
4357	(std-slot-value generic-function 'sys::optional-args)))
4358
4359	;;; AMOP pg. 231
4360	(defgeneric (setf generic-function-name) (new-value gf)
4361	(:method (new-value (gf generic-function))
4362	(reinitialize-instance gf :name new-value)))
4363
4364	;;; Readers for Method Metaobjects
4365	;;; AMOP pg. 218ff.
4366
4367	(atomic-defgeneric method-function (method)
4368	(:method ((method standard-method))
4369	(std-method-function method)))
4370
4371	(atomic-defgeneric method-generic-function (method)
4372	(:method ((method standard-method))
4373	(std-method-generic-function method)))
4374
4375	(atomic-defgeneric method-lambda-list (method)
4376	(:method ((method standard-method))
4377	(std-slot-value method 'sys::lambda-list)))
4378
4379	(atomic-defgeneric method-specializers (method)
4380	(:method ((method standard-method))
4381	(std-method-specializers method)))
4382
4383	(atomic-defgeneric method-qualifiers (method)
4384	(:method ((method standard-method))
4385	(std-method-qualifiers method)))
4386
4387	(atomic-defgeneric accessor-method-slot-definition (method)
4388	(:method ((method standard-accessor-method))
4389	(std-accessor-method-slot-definition method)))
4390
4391
4392	;;; find-method-combination
4393
4394	;;; AMOP pg. 191
4395	(atomic-defgeneric find-method-combination (gf name options)
4396	(:method (gf (name symbol) options)
4397	(std-find-method-combination gf name options)))
4398
4399	;;; specializer-direct-method and friends.
4400
4401	;;; AMOP pg. 237
4402	(defgeneric specializer-direct-generic-functions (specializer))
4403
4404	(defmethod specializer-direct-generic-functions ((specializer class))
4405	(delete-duplicates (mapcar #'method-generic-function
4406	(class-direct-methods specializer))))
4407
4408	(defmethod specializer-direct-generic-functions ((specializer eql-specializer))
4409	(delete-duplicates (mapcar #'method-generic-function
4410	(slot-value specializer 'direct-methods))))
4411
4412	;;; AMOP pg. 238
4413	(defgeneric specializer-direct-methods (specializer))
4414
4415	(defmethod specializer-direct-methods ((specializer class))
4416	(class-direct-methods specializer))
4417
4418	(defmethod specializer-direct-methods ((specializer eql-specializer))
4419	(slot-value specializer 'direct-methods))
4420
4421	;;; AMOP pg. 165
4422	(atomic-defgeneric add-direct-method (specializer method)
4423	(:method ((specializer class) (method method))
4424	(pushnew method (class-direct-methods specializer)))
4425	(:method ((specializer eql-specializer) (method method))
4426	(pushnew method (slot-value specializer 'direct-methods))))
4427
4428
4429	;;; AMOP pg. 227
4430	(atomic-defgeneric remove-direct-method (specializer method)
4431	(:method ((specializer class) (method method))
4432	(setf (class-direct-methods specializer)
4433	(remove method (class-direct-methods specializer))))
4434	(:method ((specializer eql-specializer) (method method))
4435	(setf (slot-value specializer 'direct-methods)
4436	(remove method (slot-value specializer 'direct-methods)))))
4437
4438	;;; The Dependent Maintenance Protocol (AMOP pg. 160ff.)
4439
4440	(defvar dependents (make-hash-table :test 'eq :weakness :key))
4441
4442	;;; AMOP pg. 164
4443	(defgeneric add-dependent (metaobject dependent))
4444	(defmethod add-dependent ((metaobject standard-class) dependent)
4445	(pushnew dependent (gethash metaobject dependents nil)))
4446	(defmethod add-dependent ((metaobject funcallable-standard-class) dependent)
4447	(pushnew dependent (gethash metaobject dependents nil)))
4448	(defmethod add-dependent ((metaobject standard-generic-function) dependent)
4449	(pushnew dependent (gethash metaobject dependents nil)))
4450
4451	;;; AMOP pg. 225
4452	(defgeneric remove-dependent (metaobject dependent))
4453	(defmethod remove-dependent ((metaobject standard-class) dependent)
4454	(setf (gethash metaobject dependents)
4455	(delete dependent (gethash metaobject dependents nil) :test #'eq)))
4456	(defmethod remove-dependent ((metaobject funcallable-standard-class) dependent)
4457	(setf (gethash metaobject dependents)
4458	(delete dependent (gethash metaobject dependents nil) :test #'eq)))
4459	(defmethod remove-dependent ((metaobject standard-generic-function) dependent)
4460	(setf (gethash metaobject dependents)
4461	(delete dependent (gethash metaobject dependents nil) :test #'eq)))
4462
4463	;;; AMOP pg. 210
4464	(atomic-defgeneric map-dependents (metaobject function)
4465	(:method ((metaobject standard-class) function)
4466	(dolist (dependent (gethash metaobject dependents nil))
4467	(funcall function dependent)))
4468	(:method ((metaobject funcallable-standard-class) function)
4469	(dolist (dependent (gethash metaobject dependents nil))
4470	(funcall function dependent)))
4471	(:method ((metaobject standard-generic-function) function)
4472	(dolist (dependent (gethash metaobject dependents nil))
4473	(funcall function dependent))))
4474
4475	;;; AMOP pg. 239
4476	(defgeneric update-dependent (metaobject dependent &rest initargs))
4477
4478
4479	;;; ensure-generic-function(-using-class), AMOP pg. 185ff.
4480	(defgeneric ensure-generic-function-using-class (generic-function function-name
4481	&key
4482	argument-precedence-order
4483	declarations documentation
4484	generic-function-class
4485	lambda-list method-class
4486	method-combination
4487	name
4488	&allow-other-keys))
4489
4490	(defmethod ensure-generic-function-using-class
4491	((generic-function generic-function)
4492	function-name
4493	&rest all-keys
4494	&key (generic-function-class (class-of generic-function))
4495	(method-class (generic-function-method-class generic-function))
4496	(method-combination (generic-function-method-combination generic-function))
4497	&allow-other-keys)
4498	(setf all-keys (copy-list all-keys)) ; since we modify it
4499	(remf all-keys :generic-function-class)
4500	(unless (classp generic-function-class)
4501	(setf generic-function-class (find-class generic-function-class)))
4502	(unless (classp method-class) (setf method-class (find-class method-class)))
4503	(unless (eq generic-function-class (class-of generic-function))
4504	(error "The class ~S is incompatible with the existing class (~S) of ~S."
4505	generic-function-class (class-of generic-function) generic-function))
4506	;; We used to check for changes in method class here, but CLHS says:
4507	;; "If function-name specifies a generic function that has a different
4508	;; value for the :method-class argument, the value is changed, but any
4509	;; existing methods are not changed."
4510	(unless (typep method-combination 'method-combination)
4511	(setf method-combination
4512	(find-method-combination generic-function
4513	(car method-combination)
4514	(cdr method-combination))))
4515	(apply #'reinitialize-instance generic-function
4516	:method-combination method-combination
4517	:method-class method-class
4518	all-keys)
4519	generic-function)
4520
4521	(defmethod ensure-generic-function-using-class ((generic-function null)
4522	function-name
4523	&rest all-keys
4524	&key (generic-function-class +the-standard-generic-function-class+)
4525	&allow-other-keys)
4526	(setf all-keys (copy-list all-keys)) ; since we modify it
4527	(remf all-keys :generic-function-class)
4528	(unless (classp generic-function-class)
4529	(setf generic-function-class (find-class generic-function-class)))
4530	(when (and (null clos-booting) (fboundp function-name))
4531	(if (or (autoloadp function-name)
4532	(and (consp function-name)
4533	(eq 'setf (first function-name))
4534	(autoload-ref-p (second function-name))))
4535	(fmakunbound function-name)
4536	(error 'program-error
4537	:format-control "~A already names an ordinary function, macro, or special operator."
4538	:format-arguments (list function-name))))
4539	(apply (if (eq generic-function-class +the-standard-generic-function-class+)
4540	#'make-instance-standard-generic-function
4541	#'make-instance)
4542	generic-function-class :name function-name all-keys))
4543
4544	(defun ensure-generic-function (function-name &rest all-keys
4545	&key
4546	lambda-list generic-function-class
4547	method-class
4548	method-combination
4549	argument-precedence-order
4550	declarations
4551	documentation
4552	&allow-other-keys)
4553	(declare (ignore lambda-list generic-function-class method-class
4554	method-combination argument-precedence-order declarations
4555	documentation))
4556	(apply #'ensure-generic-function-using-class
4557	(find-generic-function function-name nil)
4558	function-name all-keys))
4559
4560	;;; SLIME compatibility functions.
4561
4562	(defun %method-generic-function (method)
4563	(method-generic-function method))
4564
4565	(defun %method-function (method)
4566	(method-function method))
4567
4568	(eval-when (:compile-toplevel :load-toplevel :execute)
4569	(require "MOP"))
4570
4571	(provide "CLOS")
4572

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source: branches/streams/abcl/src/org/armedbear/lisp/clos.lisp

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