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source: branches/working-0711/ccl/level-1/l1-dcode.lisp @ 11836

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Last change on this file since 11836 was 11836, checked in by gz, 12 years ago
Typecheck new bindings in nx1-env-body, if nx-declarations-typecheck is true. Remove the typechecking from nx1-typed-var-initform since no longer needed. Remove some bogus declarations found by compiling the system with typechecking declarations.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 77.9 KB

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1	;;;--Mode: LISP; Package: CCL --
2	;;;
3	;;; Copyright (C) 1994-2001 Digitool, Inc
4	;;; This file is part of OpenMCL.
5	;;;
6	;;; OpenMCL is licensed under the terms of the Lisp Lesser GNU Public
7	;;; License , known as the LLGPL and distributed with OpenMCL as the
8	;;; file "LICENSE". The LLGPL consists of a preamble and the LGPL,
9	;;; which is distributed with OpenMCL as the file "LGPL". Where these
10	;;; conflict, the preamble takes precedence.
11	;;;
12	;;; OpenMCL is referenced in the preamble as the "LIBRARY."
13	;;;
14	;;; The LLGPL is also available online at
15	;;; http://opensource.franz.com/preamble.html
16
17
18	(in-package "CCL")
19
20
21
22
23
24
25	(defun %make-gf-instance (class &key
26	name
27	(method-combination standard-method-combination mcomb-p)
28	(method-class standard-method-class mclass-p)
29	declarations
30	(lambda-list nil ll-p)
31	(argument-precedence-order nil apo-p)
32	&allow-other-keys)
33	(when mcomb-p
34	(unless (typep method-combination 'method-combination)
35	(report-bad-arg method-combination 'method-combination)))
36	(when mclass-p
37	(if (symbolp method-class)
38	(setq method-class (find-class method-class)))
39	(unless (subtypep method-class method-class)
40	(error "~s is not a subtype of ~s." method-class method-class)))
41	(when declarations
42	(unless (list-length declarations)
43	(error "~s is not a proper list" declarations)))
44	;; Fix APO, lambda-list
45	(if apo-p
46	(if (not ll-p)
47	(error "Cannot specify ~s without specifying ~s" :argument-precedence-order
48	:lambda-list)))
49	(let* ((gf (%allocate-gf-instance class)))
50	(setf (sgf.name gf) name
51	(sgf.method-combination gf) method-combination
52	(sgf.methods gf) nil
53	(sgf.method-class gf) method-class
54	(sgf.decls gf) declarations
55	(sgf.%lambda-list gf) :unspecified
56	(sgf.dependents gf) nil)
57	(when ll-p
58	(if apo-p
59	(set-gf-arg-info gf :lambda-list lambda-list
60	:argument-precedence-order argument-precedence-order)
61	(set-gf-arg-info gf :lambda-list lambda-list)))
62	gf))
63
64	(defun gf-arg-info-valid-p (gf)
65	(let* ((bits (lfun-bits gf)))
66	(declare (fixnum bits))
67	(not (and (logbitp $lfbits-aok-bit bits)
68	(not (logbitp $lfbits-keys-bit bits))))))
69
70	;;; Derive a GF lambda list from the method's lambda list.
71	(defun flatten-method-lambda-list (lambda-list)
72	(collect ((ll))
73	(dolist (x lambda-list (ll))
74	(if (atom x)
75	(if (eq x '&aux)
76	(return (ll))
77	(ll x))
78	(ll (car x))))))
79
80	(defun %maybe-compute-gf-lambda-list (gf method)
81	(let* ((gf-ll (sgf.%lambda-list gf)))
82	(if (eq gf-ll :unspecified)
83	(and method
84	(let* ((method-lambda-list (%method-lambda-list method))
85	(method-has-&key (member '&key method-lambda-list))
86	(method-has-&allow-other-keys
87	(member '&allow-other-keys method-lambda-list)))
88	(if method-has-&key
89	(nconc (ldiff method-lambda-list (cdr method-has-&key))
90	(if method-has-&allow-other-keys
91	'(&allow-other-keys)))
92	(flatten-method-lambda-list method-lambda-list))))
93	gf-ll)))
94
95
96	;;; Borrowed from PCL, sort of. We can encode required/optional/restp/keyp
97	;;; information in the gf's lfun-bits
98	(defun set-gf-arg-info (gf &key new-method (lambda-list nil lambda-list-p)
99	(argument-precedence-order nil apo-p))
100	(let* ((methods (%gf-methods gf))
101	(dt (%gf-dispatch-table gf))
102	(gf-lfun-bits (lfun-bits gf))
103	(first-method-p (and new-method (null methods))))
104	(declare (fixnum gf-lfun-bits))
105	(unless lambda-list-p
106	(setq lambda-list
107	(%maybe-compute-gf-lambda-list gf (or (car (last methods))
108	new-method))))
109	(when (or lambda-list-p
110	(and first-method-p
111	(eq (%gf-%lambda-list gf) :unspecified)))
112	(multiple-value-bind (newbits keyvect)
113	(encode-lambda-list lambda-list t)
114	(declare (fixnum newbits))
115	(when (and methods (not first-method-p))
116	(unless (and (= (ldb $lfbits-numreq gf-lfun-bits)
117	(ldb $lfbits-numreq newbits))
118	(= (ldb $lfbits-numopt gf-lfun-bits)
119	(ldb $lfbits-numopt newbits))
120	(eq (or (logbitp $lfbits-keys-bit gf-lfun-bits)
121	(logbitp $lfbits-rest-bit gf-lfun-bits)
122	(logbitp $lfbits-restv-bit gf-lfun-bits))
123	(or (logbitp $lfbits-keys-bit newbits)
124	(logbitp $lfbits-rest-bit newbits)
125	(logbitp $lfbits-restv-bit newbits))))
126	(cerror (format nil
127	"Remove ~d method~:p from the generic-function and ~
128	change its lambda list."
129	(length (%gf-methods gf)))
130	"New lambda list of generic function ~s is not congruent ~
131	with lambda lists of existing methods.~%~
132	Generic-function's : ~s~%~
133	Method's lambda-list : ~s~%"
134	gf lambda-list (%method-lambda-list (car methods)))
135	(loop
136	(let ((methods (%gf-methods gf)))
137	(if methods
138	(remove-method gf (car methods))
139	(return))))
140	(%set-defgeneric-keys gf nil)))
141	(when lambda-list-p
142	(setf (%gf-%lambda-list gf) lambda-list
143	(%gf-dispatch-table-keyvect dt) keyvect))
144	(when (and apo-p lambda-list-p)
145	(let* ((old-precedence-list (%gf-dispatch-table-precedence-list dt)))
146	(setf (%gf-dispatch-table-precedence-list dt)
147	(canonicalize-argument-precedence-order
148	argument-precedence-order
149	(required-lambda-list-args lambda-list)))
150	(unless (equal old-precedence-list
151	(%gf-dispatch-table-precedence-list dt))
152	(clear-gf-dispatch-table dt))))
153	(lfun-bits gf (logior (ash 1 $lfbits-gfn-bit)
154	(logand $lfbits-args-mask newbits)))))
155	(when new-method
156	(check-defmethod-congruency gf new-method))))
157
158	(defun %gf-name (gf &optional (new-name nil new-name-p))
159	(let* ((old-name (%standard-generic-function-instance-location-access
160	gf sgf.name)))
161	(if new-name-p
162	(setf (sgf.name gf) new-name))
163	(unless (eq old-name (%slot-unbound-marker))
164	old-name)))
165
166
167
168
169	(defun make-n+1th-arg-combined-method (methods gf argnum)
170	(let ((table (make-gf-dispatch-table)))
171	(setf (%gf-dispatch-table-methods table) methods
172	(%gf-dispatch-table-argnum table) (%i+ 1 argnum))
173	(let ((self (%cons-combined-method gf table #'%%nth-arg-dcode))) ; <<
174	(setf (%gf-dispatch-table-gf table) self)
175	self)))
176
177	;;; Bring the generic function to the smallest possible size by removing
178	;;; any cached recomputable info. Currently this means clearing out the
179	;;; combined methods from the dispatch table.
180
181	(defun clear-gf-cache (gf)
182	#-bccl (unless t (typep gf 'standard-generic-function)
183	(report-bad-arg gf 'standard-generic-function))
184	(let ((dt (%gf-dispatch-table gf)))
185	(if (eq (%gf-dispatch-table-size dt) min-gf-dispatch-table-size)
186	(clear-gf-dispatch-table dt)
187	(let ((new (make-gf-dispatch-table)))
188	(setf (%gf-dispatch-table-methods new) (%gf-dispatch-table-methods dt))
189	(setf (%gf-dispatch-table-precedence-list new)
190	(%gf-dispatch-table-precedence-list dt))
191	(setf (%gf-dispatch-table-gf new) gf)
192	(setf (%gf-dispatch-table-keyvect new)
193	(%gf-dispatch-table-keyvect dt))
194	(setf (%gf-dispatch-table-argnum new) (%gf-dispatch-table-argnum dt))
195	(setf (%gf-dispatch-table gf) new)))))
196
197	(defun %gf-dispatch-table-store-conditional (dt index new)
198	"Returns T if the new value can be stored in DT at INDEX, replacing a NIL.
199	Returns NIL - without storing anything - if the value already in DT
200	at INDEX is non-NIL at the time of the store."
201	(let ((offset (+ (ash (%i+ index %gf-dispatch-table-first-data)
202	target::word-shift)
203	target::misc-data-offset)))
204	(or (%store-node-conditional offset dt nil new)
205	(%store-node-conditional offset dt gf-dispatch-bug new))))
206
207	(defun grow-gf-dispatch-table (gf-or-cm wrapper table-entry &optional obsolete-wrappers-p)
208	;; Grow the table associated with gf and insert table-entry as the value for
209	;; wrapper. Wrapper is a class-wrapper. Assumes that it is not obsolete.
210	(let* ((dt (if (generic-function-p gf-or-cm)
211	(%gf-dispatch-table gf-or-cm)
212	(%combined-method-methods gf-or-cm)))
213	(size (%gf-dispatch-table-size dt))
214	(new-size (if obsolete-wrappers-p
215	size
216	(%i+ size size)))
217	new-dt)
218	(if (> new-size max-gf-dispatch-table-size)
219	(progn
220	(setq new-dt (clear-gf-dispatch-table dt)
221	gf-dt-ovf-cnt (%i+ gf-dt-ovf-cnt 1)))
222	(progn
223	(setq new-dt (make-gf-dispatch-table new-size))
224	(setf (%gf-dispatch-table-methods new-dt) (%gf-dispatch-table-methods dt)
225	(%gf-dispatch-table-precedence-list new-dt) (%gf-dispatch-table-precedence-list dt)
226	(%gf-dispatch-table-keyvect new-dt) (%gf-dispatch-table-keyvect dt)
227	(%gf-dispatch-table-gf new-dt) gf-or-cm
228	(%gf-dispatch-table-argnum new-dt) (%gf-dispatch-table-argnum dt))
229	(let ((i 0) index w cm)
230	(dotimes (j (%ilsr 1 (%gf-dispatch-table-size dt)))
231	(declare (fixnum j))
232	(unless (or (null (setq w (%gf-dispatch-table-ref dt i)))
233	(eql 0 (%wrapper-hash-index w))
234	(no-applicable-method-cm-p
235	(setq cm (%gf-dispatch-table-ref dt (%i+ i 1)))))
236	(setq index (find-gf-dispatch-table-index new-dt w t))
237	(setf (%gf-dispatch-table-ref new-dt index) w)
238	(setf (%gf-dispatch-table-ref new-dt (%i+ index 1)) cm))
239	(setq i (%i+ i 2))))))
240	(let ((index (find-gf-dispatch-table-index new-dt wrapper t)))
241	(setf (%gf-dispatch-table-ref new-dt index) wrapper)
242	(setf (%gf-dispatch-table-ref new-dt (%i+ index 1)) table-entry))
243	(if (generic-function-p gf-or-cm)
244	(setf (%gf-dispatch-table gf-or-cm) new-dt)
245	(setf (%combined-method-methods gf-or-cm) new-dt))))
246
247
248	(defun inner-lfun-bits (function &optional value)
249	(lfun-bits (closure-function function) value))
250
251
252
253	;;; probably want to use alists vs. hash-tables initially
254
255
256	;;; only used if error - well not really
257	(defun collect-lexpr-args (args first &optional last)
258	(if (listp args)
259	(subseq args first (or last (length args)))
260	(let ((res nil))
261	(when (not last)(setq last (%lexpr-count args)))
262	(dotimes (i (- last first))
263	(setq res (push (%lexpr-ref args last (+ first i)) res)))
264	(nreverse res))))
265
266
267
268
269	(defmacro with-list-from-lexpr ((list lexpr) &body body)
270	(let ((len (gensym)))
271	`(let* ((,len (%lexpr-count ,lexpr))
272	(,list (make-list ,len)))
273	(declare (dynamic-extent ,list) (fixnum ,len))
274	(do* ((i 0 (1+ i))
275	(ls ,list (cdr ls)))
276	((= i ,len) ,list)
277	(declare (fixnum i) (list ls))
278	(declare (optimize (speed 3)(safety 0)))
279	(%rplaca ls (%lexpr-ref ,lexpr ,len i)))
280	,@body)))
281
282
283
284	(defmacro %standard-instance-p (i)
285	`(eq (typecode ,i) ,(type-keyword-code :instance)))
286
287
288
289	(declaim (inline %find-1st-arg-combined-method))
290	(declaim (inline %find-nth-arg-combined-method))
291
292
293
294
295	(defun %find-1st-arg-combined-method (dt arg)
296	(let ((wrapper (instance-class-wrapper arg)))
297	(when (eql 0 (%wrapper-hash-index wrapper))
298	(update-obsolete-instance arg)
299	(setq wrapper (instance-class-wrapper arg)))
300	(let* ((mask (%gf-dispatch-table-mask dt))
301	(index (%ilsl 1 (%ilogand mask (%wrapper-hash-index wrapper))))
302	table-wrapper flag)
303	(declare (fixnum index mask))
304	(loop
305	(if (eq (setq table-wrapper (%gf-dispatch-table-ref dt index)) wrapper)
306	(return (%gf-dispatch-table-ref dt (the fixnum (1+ index))))
307	(progn
308	(when (null (%gf-dispatch-table-ref dt (the fixnum (1+ index))))
309	(if (or (neq table-wrapper (%unbound-marker))
310	(eql 0 flag))
311	(without-interrupts ; why?
312	(return (1st-arg-combined-method-trap (%gf-dispatch-table-gf dt) wrapper arg))) ; the only difference?
313	(setq flag 0 index -2)))
314	(setq index (+ 2 index))))))))
315
316	;;; for calls from outside - e.g. stream-reader
317	(defun find-1st-arg-combined-method (gf arg)
318	(declare (optimize (speed 3)(safety 0)))
319	(%find-1st-arg-combined-method (%gf-dispatch-table gf) arg))
320
321
322	;;; more PC - it it possible one needs to go round more than once? -
323	;;; seems unlikely
324	(defun %find-nth-arg-combined-method (dt arg args)
325	(declare (optimize (speed 3)(safety 0)))
326	(let ((wrapper (instance-class-wrapper arg)))
327	(when (eql 0 (%wrapper-hash-index wrapper))
328	(update-obsolete-instance arg)
329	(setq wrapper (instance-class-wrapper arg)))
330	(let* ((mask (%gf-dispatch-table-mask dt))
331	(index (%ilsl 1 (%ilogand mask (%wrapper-hash-index wrapper))))
332	table-wrapper flag)
333	(declare (fixnum index mask))
334	(loop
335	(if (eq (setq table-wrapper (%gf-dispatch-table-ref dt index)) wrapper)
336	(return (%gf-dispatch-table-ref dt (the fixnum (1+ index))))
337	(progn
338	(when (null (%gf-dispatch-table-ref dt (the fixnum (1+ index))))
339	(if (or (neq table-wrapper (%unbound-marker))
340	(eql 0 flag))
341	(without-interrupts ; why?
342	(let ((gf (%gf-dispatch-table-gf dt)))
343	(if (listp args)
344	(return (nth-arg-combined-method-trap-0 gf dt wrapper args))
345	(with-list-from-lexpr (args-list args)
346	(return (nth-arg-combined-method-trap-0 gf dt wrapper args-list))))))
347	(setq flag 0 index -2)))
348	(setq index (+ 2 index))))))))
349
350
351
352
353	;;;;;;;;;;;;;;;;;;;;;;;;;;; Generic functions and methods ;;;;;;;;;;;;;;;;;;;;
354	(defun %class-cpl (class)
355	(if (%standard-instance-p class)
356	(%class.cpl class)
357	(or
358	(and (typep class 'macptr)
359	(let* ((slots (foreign-slots-vector class)))
360	(and slots (%slot-ref slots %class.cpl))))
361	(error "Can't determine CPL of class ~s" class))))
362
363
364	(defun standard-method-p (thing)
365	(when (%standard-instance-p thing)
366	(let* ((cpl (%class-cpl (%wrapper-class (instance.class-wrapper thing))))
367	(smc standard-method-class))
368	(dolist (c cpl)
369	(if (eq c smc)(return t))))))
370
371
372
373	(defun %method-function-p (thing)
374	(when (functionp thing)
375	(let ((bits (lfun-bits thing)))
376	(declare (fixnum bits))
377	(logbitp $lfbits-method-bit bits))))
378
379
380
381
382	(setf (type-predicate 'standard-generic-function) 'standard-generic-function-p)
383	(setf (type-predicate 'combined-method) 'combined-method-p)
384
385	(setf (type-predicate 'standard-method) 'standard-method-p)
386
387	;; Maybe we shouldn't make this a real type...
388	(setf (type-predicate 'method-function) '%method-function-p)
389
390
391	(defvar %all-gfs% (%cons-population nil))
392
393
394	(eval-when (:compile-toplevel :execute)
395	(defconstant $lfbits-numinh-mask (logior (dpb -1 $lfbits-numinh 0)
396	(%ilsl $lfbits-nonnullenv-bit 1)))
397	)
398
399
400	#+ppc-target
401	(defvar fi-trampoline-code (uvref #'funcallable-trampoline 0))
402
403
404	#+ppc-target
405	(defvar unset-fin-code (uvref #'unset-fin-trampoline 0))
406
407
408
409	#+ppc-target
410	(defvar gf-proto-code (uvref gf-proto 0))
411
412	;;; The "early" version of %ALLOCATE-GF-INSTANCE.
413	(setf (fdefinition '%allocate-gf-instance)
414	#'(lambda (class)
415	(declare (ignorable class))
416	(setq class standard-generic-function-class)
417	(let* ((wrapper (%class.own-wrapper class))
418	(len (length #.(%wrapper-instance-slots (class-own-wrapper
419	standard-generic-function-class))))
420	(dt (make-gf-dispatch-table))
421	(slots (allocate-typed-vector :slot-vector (1+ len) (%slot-unbound-marker)))
422	(fn #+ppc-target
423	(gvector :function
424	gf-proto-code
425	wrapper
426	slots
427	dt
428	#'%%0-arg-dcode
429	0
430	(%ilogior (%ilsl $lfbits-gfn-bit 1)
431	(%ilogand $lfbits-args-mask 0)))
432	#+x86-target
433	(%clone-x86-function gf-proto
434	wrapper
435	slots
436	dt
437	#'%%0-arg-dcode
438	0
439	(%ilogior (%ilsl $lfbits-gfn-bit 1)
440	(%ilogand $lfbits-args-mask 0)))))
441	(setf ;(gf.hash fn) (strip-tag-to-fixnum fn)
442	(slot-vector.instance slots) fn
443	(%gf-dispatch-table-gf dt) fn)
444	(push fn (population.data %all-gfs%))
445	fn)))
446
447
448
449
450
451
452
453
454
455	(defparameter gf-proto-one-arg #'gag-one-arg)
456	(defparameter gf-proto-two-arg #'gag-two-arg)
457
458
459
460
461	#+ppc-target
462	(defvar cm-proto-code (uvref cm-proto 0))
463
464	(defun %cons-combined-method (gf thing dcode)
465	;; set bits and name = gf
466	#+ppc-target
467	(gvector :function
468	cm-proto-code
469	thing
470	dcode
471	gf
472	(%ilogior (%ilsl $lfbits-cm-bit 1)
473	(%ilogand $lfbits-args-mask (lfun-bits gf))))
474	#+x86-target
475	(%clone-x86-function cm-proto
476	thing
477	dcode
478	gf
479	(%ilogior (%ilsl $lfbits-cm-bit 1)
480	(%ilogand $lfbits-args-mask (lfun-bits gf)))))
481
482	(defun %gf-dispatch-table (gf)
483	;(require-type gf 'standard-generic-function)
484	(gf.dispatch-table gf))
485
486	(defun %gf-dcode (gf)
487	;(require-type gf 'standard-generic-function)
488	(gf.dcode gf))
489
490	(defun %set-gf-dcode (gf dcode)
491	(let ((gf (require-type gf 'funcallable-standard-object))
492	(dcode (require-type dcode 'function)))
493	(replace-function-code gf (or (cdr (assq dcode dcode-proto-alist))
494	#'funcallable-trampoline))
495	(setf (gf.dcode gf) dcode)))
496
497	(defun %set-gf-dispatch-table (gf val)
498	(setf (gf.dispatch-table gf) val))
499
500	(defun %combined-method-methods (cm)
501	;(require-type cm 'combined-method)
502	(combined-method.thing cm))
503
504	(defun %combined-method-dcode (cm)
505	;(require-type cm 'combined-method)
506	(combined-method.dcode cm))
507
508	(defun %set-combined-method-methods (cm val)
509	(setf (combined-method.thing cm) val))
510
511	(defun %set-combined-method-dcode (cm val)
512	(setf (combined-method.dcode cm) val))
513
514	(declaim (inline funcallable-instance-p))
515	(defun funcallable-instance-p (thing)
516	(when (typep thing 'function)
517	(let ((bits (lfun-bits-known-function thing)))
518	(declare (fixnum bits))
519	(eq (ash 1 $lfbits-gfn-bit)
520	(logand bits (logior (ash 1 $lfbits-gfn-bit)
521	(ash 1 $lfbits-method-bit)))))))
522
523	(setf (type-predicate 'funcallable-standard-object) 'funcallable-instance-p)
524
525	(defstatic generic-function-class-wrapper nil)
526	(defstatic standard-generic-function-class-wrapper nil)
527
528	(defun generic-function-p (thing)
529	(and (typep thing 'funcallable-standard-object)
530	(let* ((wrapper (gf.instance.class-wrapper thing)))
531	;; In practice, many generic-functions are standard-generic-functions.
532	(or (eq standard-generic-function-class-wrapper wrapper)
533	(eq generic-function-class-wrapper wrapper)
534	(let* ((bits (or (%wrapper-cpl-bits wrapper)
535	(make-cpl-bits (%inited-class-cpl (%wrapper-class wrapper)))))
536	(ordinal (%wrapper-class-ordinal generic-function-class-wrapper)))
537	(and bits ordinal
538	(locally (declare (simple-bit-vector bits)
539	(fixnum ordinal)
540	(optimize (speed 3) (safety 0)))
541	(and (< ordinal (length bits))
542	(eql 1 (sbit bits ordinal))))))))))
543
544
545	(defun standard-generic-function-p (thing)
546	(and (typep thing 'function)
547	(let ((bits (lfun-bits-known-function thing)))
548	(declare (fixnum bits))
549	(eq (ash 1 $lfbits-gfn-bit)
550	(logand bits (logior (ash 1 $lfbits-gfn-bit)
551	(ash 1 $lfbits-method-bit)))))
552	(or (eq (%class.own-wrapper standard-generic-function-class)
553	(gf.instance.class-wrapper thing))
554	(memq standard-generic-function-class
555	(%inited-class-cpl (class-of thing))))))
556
557
558	(defun combined-method-p (thing)
559	(when (functionp thing)
560	(let ((bits (lfun-bits-known-function thing)))
561	(declare (fixnum bits))
562	(eq (ash 1 $lfbits-cm-bit)
563	(logand bits
564	(logior (ash 1 $lfbits-cm-bit)
565	(ash 1 $lfbits-method-bit)))))))
566
567	(setf (type-predicate 'generic-function) 'generic-function-p)
568
569	(setf (type-predicate 'standard-generic-function) 'standard-generic-function-p)
570	(setf (type-predicate 'funcallable-standard-object) 'funcallable-instance-p)
571	(setf (type-predicate 'combined-method) 'combined-method-p)
572
573
574
575	;;; A generic-function looks like:
576	;;;
577	;;; header \| trampoline \| dispatch-table \| dcode \| name \| bits
578	;;; %svref : 0 1 2 3 4
579	;;;
580	;;; The trampoline is gf-proto's code vector.
581	;;; The dispatch-table and dcode are sort of settable closed-over variables.
582
583	(defsetf %gf-dispatch-table %set-gf-dispatch-table)
584
585	(defun %gf-methods (gf)
586	(sgf.methods gf))
587
588	(defun %gf-precedence-list (gf)
589	(%gf-dispatch-table-precedence-list (%gf-dispatch-table gf)))
590
591	(defun %gf-%lambda-list (gf)
592	(sgf.%lambda-list gf))
593
594	(defun (setf %gf-%lambda-list) (new gf)
595	(setf (sgf.%lambda-list gf) new))
596
597	;;; Returns INSTANCE if it is either a standard instance of a
598	;;; standard gf, else nil.
599	(defun %maybe-gf-instance (instance)
600	(if (or (standard-generic-function-p instance)
601	(%standard-instance-p instance))
602	instance))
603
604	(defsetf %gf-dcode %set-gf-dcode)
605
606	(defun %gf-method-class (gf)
607	(sgf.method-class gf))
608
609
610	(defun %gf-method-combination (gf)
611	(sgf.method-combination gf))
612
613	; need setters too
614
615	(defsetf %combined-method-methods %set-combined-method-methods)
616
617	(defparameter min-gf-dispatch-table-size 2
618	"The minimum size of a generic-function dispatch table")
619
620	(defun make-gf-dispatch-table (&optional (size min-gf-dispatch-table-size))
621	(when (<= size 0) (report-bad-arg size '(integer 1)))
622	(setq size (%imax (%ilsl (%i- (integer-length (%i+ size size -1))
623	1)
624	1) ; next power of 2
625	min-gf-dispatch-table-size))
626	(let ((res (%cons-gf-dispatch-table size)))
627	(declare (optimize (speed 3) (safety 0)))
628	(setf (%gf-dispatch-table-mask res) (%i- (%ilsr 1 size) 1)
629	(%gf-dispatch-table-argnum res) 0
630	(%gf-dispatch-table-ref res size) (%unbound-marker))
631	res))
632
633	;;; I wanted this to be faster - I didn't
634	(defun clear-gf-dispatch-table (dt)
635	(let ((i %gf-dispatch-table-first-data))
636	(dotimes (j (%gf-dispatch-table-size dt))
637	(declare (fixnum j))
638	(setf (%svref dt i) nil
639	i (%i+ i 1)))
640	(setf (%svref dt i) (%unbound-marker)) ; paranoia...
641	(setf (svref dt (%i+ 1 i)) nil))
642	dt)
643
644
645	; Remove all combined-methods from the world
646	(defun clear-all-gf-caches ()
647	(dolist (f (population-data %all-gfs%))
648	(clear-gf-cache f))
649	(clrhash combined-methods)
650	nil)
651
652
653	;;; Searches for an empty slot in dt at the hash-index for wrapper.
654	;;; Returns nil if the table was full.
655	(defun find-gf-dispatch-table-index (dt wrapper &optional skip-full-check?)
656	(let ((contains-obsolete-wrappers-p nil)
657	(mask (%gf-dispatch-table-mask dt)))
658	(declare (fixnum mask))
659	(unless skip-full-check?
660	(let* ((size (1+ mask))
661	(max-count (- size (the fixnum (ash (the fixnum (+ size 3)) -2))))
662	(index 0)
663	(count 0))
664	(declare (fixnum size max-count index count))
665	(dotimes (i size)
666	(declare (fixnum i))
667	(let ((wrapper (%gf-dispatch-table-ref dt index)))
668	(if wrapper
669	(if (eql 0 (%wrapper-hash-index wrapper))
670	(setf contains-obsolete-wrappers-p t
671	(%gf-dispatch-table-ref dt index) obsolete-wrapper
672	(%gf-dispatch-table-ref dt (1+ index)) gf-dispatch-bug)
673	(setq count (%i+ count 1)))))
674	(setq index (%i+ index 2)))
675	(when (> count max-count)
676	(return-from find-gf-dispatch-table-index (values nil contains-obsolete-wrappers-p)))))
677	(let* ((index (ash (logand mask (%wrapper-hash-index wrapper)) 1))
678	(flag nil)
679	table-wrapper)
680	(values
681	(loop
682	(while (and (neq wrapper
683	(setq table-wrapper (%gf-dispatch-table-ref dt index)))
684	(%gf-dispatch-table-ref dt (1+ index))
685	(neq 0 (%wrapper-hash-index table-wrapper)))
686	(setq index (%i+ index 2)))
687	(if (eq (%unbound-marker) table-wrapper)
688	(if flag
689	(return nil) ; table full
690	(setq flag 1
691	index 0))
692	(return index)))
693	contains-obsolete-wrappers-p))))
694
695
696	(defvar obsolete-wrapper #(obsolete-wrapper 0))
697	(defvar gf-dispatch-bug
698	#'(lambda (&rest rest)
699	(declare (ignore rest))
700	(error "Generic-function dispatch bug!")))
701
702
703	;;; This maximum is necessary because of the 32 bit arithmetic in
704	;;; find-gf-dispatch-table-index.
705	(defparameter max-gf-dispatch-table-size (expt 2 16))
706	(defvar gf-dt-ovf-cnt 0) ; overflow count
707
708	(defvar no-applicable-method-hash nil)
709
710
711	(let* ((eql-specializers-lock (make-lock))
712	(eql-specializers-hash (make-hash-table :test #'eql)))
713	(defun intern-eql-specializer (object)
714	(with-lock-grabbed (eql-specializers-lock)
715	(or (gethash object eql-specializers-hash)
716	(setf (gethash object eql-specializers-hash)
717	(make-instance 'eql-specializer :object object))))))
718
719
720	(setq no-applicable-method-hash (make-hash-table :test 'eq :size 0 :weak :key))
721
722
723	(defun make-no-applicable-method-function (gf)
724	(if no-applicable-method-hash
725	(progn
726	(or (gethash gf no-applicable-method-hash))
727	(setf (gethash gf no-applicable-method-hash)
728	(%cons-no-applicable-method gf)))
729	(%cons-no-applicable-method gf)))
730
731	(defun %cons-no-applicable-method (gf)
732	(%cons-combined-method gf gf #'%%no-applicable-method))
733
734	; Returns true if F is a combined-method that calls no-applicable-method
735	(defun no-applicable-method-cm-p (f)
736	(and (typep f 'combined-method)
737	(eq '%%no-applicable-method
738	(function-name (%combined-method-dcode f)))))
739
740
741	(defun %%no-applicable-method (gf args)
742	(if (listp args)
743	(apply #'no-applicable-method gf args)
744	(%apply-lexpr #'no-applicable-method gf args )))
745
746	;;; if obsolete-wrappers-p is true, will rehash instead of grow.
747	;;; It would be better to do the rehash in place, but I'm lazy today.
748
749
750	(defun arg-wrapper (arg)
751	(or (standard-object-p arg)
752	(%class.own-wrapper (class-of arg))
753	(error "~a has no wrapper" arg)))
754
755	;;;;;;;;;;;;;;;;;;;;;;;;; generic-function dcode ;;;;;;;;;;;;;;;;;;;;;;;;;;;
756
757	;; dcode functions using other than gf-proto
758	(defparameter dcode-proto-alist ())
759
760	(defun register-dcode-proto (dcode proto)
761	(let ((a (assoc dcode dcode-proto-alist)))
762	(if a
763	(setf (cdr a) proto)
764	(push (cons dcode proto) dcode-proto-alist))))
765
766
767	;;; Simple case for generic-functions with no specializers
768	;;; Why anyone would want to do this I can't imagine.
769
770	(defun %%0-arg-dcode (dispatch-table args) ; need to get gf from table
771	(let ((method (or (%gf-dispatch-table-ref dispatch-table 1)
772	(0-arg-combined-method-trap
773	(%gf-dispatch-table-gf dispatch-table)))))
774	(if (not (listp args))
775	(progn
776	(%apply-lexpr-tail-wise method args))
777	(apply method args))))
778
779	(register-dcode-proto #'%%0-arg-dcode gf-proto)
780
781	(defun dcode-too-few-args (arg-count cm-or-gf)
782	(error (make-condition 'too-few-arguments
783	:nargs arg-count
784	:fn (combined-method-gf cm-or-gf))))
785
786
787
788	(defun %%1st-arg-dcode (dt args)
789	;(declare (dynamic-extent args))
790	(if (not (listp args))
791	(let* ((args-len (%lexpr-count args)))
792	(if (neq 0 args-len)
793	(let ((method (%find-1st-arg-combined-method dt (%lexpr-ref args args-len 0))))
794	(%apply-lexpr-tail-wise method args))
795	(dcode-too-few-args 0 (%gf-dispatch-table-gf dt))))
796	(let* () ; happens if traced
797	(when (null args) (dcode-too-few-args 0 (%gf-dispatch-table-gf dt)))
798	(let ((method (%find-1st-arg-combined-method dt (%car args))))
799	(apply method args)))))
800	(register-dcode-proto #'%%1st-arg-dcode gf-proto)
801
802	(defun %%one-arg-dcode (dt arg)
803	(let ((method (%find-1st-arg-combined-method dt arg)))
804	(funcall method arg)))
805	(register-dcode-proto #'%%one-arg-dcode gf-proto-one-arg)
806
807	;;; two args - specialized on first
808	(defun %%1st-two-arg-dcode (dt arg1 arg2)
809	(let ((method (%find-1st-arg-combined-method dt arg1)))
810	(funcall method arg1 arg2)))
811	(register-dcode-proto #'%%1st-two-arg-dcode gf-proto-two-arg)
812
813
814	;;; arg is dispatch-table and argnum is in the dispatch table
815	(defun %%nth-arg-dcode (dt args)
816	(if (listp args)
817	(let* ((args-len (list-length args))
818	(argnum (%gf-dispatch-table-argnum dt)))
819	(declare (fixnum args-len argnum))
820	(when (>= argnum args-len) (dcode-too-few-args args-len (%gf-dispatch-table-gf dt)))
821	(let ((method (%find-nth-arg-combined-method dt (nth argnum args) args)))
822	(apply method args)))
823	(let* ((args-len (%lexpr-count args))
824	(argnum (%gf-dispatch-table-argnum dt)))
825	(declare (fixnum args-len argnum))
826	(when (>= argnum args-len) (dcode-too-few-args args-len (%gf-dispatch-table-gf dt)))
827	(let ((method (%find-nth-arg-combined-method dt (%lexpr-ref args args-len argnum) args)))
828	(%apply-lexpr-tail-wise method args)))))
829	(register-dcode-proto #'%%nth-arg-dcode gf-proto)
830
831	(defun 0-arg-combined-method-trap (gf)
832	(let* ((methods (%gf-methods gf))
833	(mc (%gf-method-combination gf))
834	(cm (if (eq mc standard-method-combination)
835	(make-standard-combined-method methods nil gf)
836	(compute-effective-method-function
837	gf
838	mc
839	(sort-methods (copy-list methods) nil)))))
840	(setf (%gf-dispatch-table-ref (%gf-dispatch-table gf) 1) cm)
841	cm))
842
843	(defun compute-effective-method-function (gf mc methods)
844	(if methods
845	(compute-effective-method gf mc methods)
846	(make-no-applicable-method-function gf)))
847
848	(defun 1st-arg-combined-method-trap (gf wrapper arg)
849	;; Here when we can't find the method in the dispatch table.
850	;; Compute it and add it to the table. This code will remain in Lisp.
851	(let ((table (%gf-dispatch-table gf))
852	(combined-method (compute-1st-arg-combined-method gf arg wrapper)))
853	(multiple-value-bind (index obsolete-wrappers-p)
854	(find-gf-dispatch-table-index table wrapper)
855	(if index
856	(if (%gf-dispatch-table-store-conditional table (%i+ index 1) combined-method)
857	(setf (%gf-dispatch-table-ref table index) wrapper))
858	(grow-gf-dispatch-table gf wrapper combined-method obsolete-wrappers-p)))
859	combined-method))
860
861	(defvar cpl-classes nil)
862
863	(defun %inited-class-cpl (class &optional initialize-can-fail)
864	(or (%class-cpl class)
865	(if (memq class cpl-classes)
866	(compute-cpl class)
867	(let ((cpl-classes (cons class cpl-classes)))
868	(declare (dynamic-extent cpl-classes))
869	(update-class class initialize-can-fail)
870	(%class-cpl class)))))
871
872
873	(defun compute-1st-arg-combined-method (gf arg &optional
874	(wrapper (arg-wrapper arg)))
875	(let* ((methods (%gf-dispatch-table-methods (%gf-dispatch-table gf)))
876	(cpl (%inited-class-cpl (%wrapper-class wrapper)))
877	(method-combination (%gf-method-combination gf))
878	applicable-methods eql-methods specializer)
879	(dolist (method methods)
880	(setq specializer (%car (%method.specializers method)))
881	(if (typep specializer 'eql-specializer)
882	(when (cpl-memq (%wrapper-class (arg-wrapper (eql-specializer-object specializer))) cpl)
883	(push method eql-methods))
884	(when (cpl-memq specializer cpl)
885	(push method applicable-methods))))
886	(if (null eql-methods)
887	(if (eq method-combination standard-method-combination)
888	(make-standard-combined-method applicable-methods (list cpl) gf)
889	(compute-effective-method-function
890	gf
891	method-combination
892	(sort-methods applicable-methods
893	(list cpl)
894	(%gf-precedence-list gf))))
895	(make-eql-combined-method
896	eql-methods applicable-methods (list cpl) gf 0 nil method-combination))))
897
898
899
900	(defvar combined-methods (make-hash-table :test 'equal :weak :value))
901
902	(defun gethash-combined-method (key)
903	(gethash key combined-methods))
904
905	(defun puthash-combined-method (key value)
906	(setf (gethash key combined-methods) value))
907
908	;;; Some statistics on the hash table above
909	(defvar returned-combined-methods 0)
910	(defvar consed-combined-methods 0)
911
912	;;; Assumes methods are already sorted if cpls is nil
913	(defun make-standard-combined-method (methods cpls gf &optional
914	(ok-if-no-primaries (null methods)))
915	(unless (null cpls)
916	(setq methods (sort-methods
917	methods cpls (%gf-precedence-list (combined-method-gf gf)))))
918	(let* ((keywords (compute-allowable-keywords-vector gf methods))
919	(combined-method (make-standard-combined-method-internal
920	methods gf keywords ok-if-no-primaries)))
921	(if (and keywords methods)
922	(make-keyword-checking-combined-method gf combined-method keywords)
923	combined-method)))
924
925
926	;;; Initialized below after the functions exist.
927	(defvar clos-initialization-functions nil)
928
929	;;; Returns NIL if all keywords allowed, or a vector of the allowable ones.
930	(defun compute-allowable-keywords-vector (gf methods)
931	(setq gf (combined-method-gf gf))
932	(unless (memq gf clos-initialization-functions)
933	(let* ((gbits (inner-lfun-bits gf))
934	(&key-mentioned-p (logbitp $lfbits-keys-bit gbits)))
935	(unless (or (logbitp $lfbits-aok-bit gbits)
936	(dolist (method methods)
937	(let ((mbits (lfun-bits (%method.function method))))
938	(when (logbitp $lfbits-keys-bit mbits)
939	(setq &key-mentioned-p t)
940	(if (logbitp $lfbits-aok-bit mbits)
941	(return t)))))
942	(not &key-mentioned-p))
943	(let (keys)
944	(flet ((adjoin-keys (keyvect keys)
945	(when keyvect
946	(dovector (key keyvect) (pushnew key keys)))
947	keys))
948	(when (logbitp $lfbits-keys-bit gbits)
949	(setq keys (adjoin-keys (%defgeneric-keys gf) keys)))
950	(dolist (method methods)
951	(let ((f (%inner-method-function method)))
952	(when (logbitp $lfbits-keys-bit (lfun-bits f))
953	(setq keys (adjoin-keys (lfun-keyvect f) keys))))))
954	(apply #'vector keys))))))
955
956
957	(defun make-keyword-checking-combined-method (gf combined-method keyvect)
958	(let* ((bits (inner-lfun-bits gf))
959	(numreq (ldb $lfbits-numreq bits))
960	(key-index (+ numreq (ldb $lfbits-numopt bits))))
961	(%cons-combined-method
962	gf
963	(vector key-index keyvect combined-method)
964	#'%%check-keywords)))
965
966
967
968	(defun odd-keys-error (varg l)
969	(let ((gf (combined-method-gf (%svref varg 2))))
970	(signal-program-error "Odd number of keyword args to ~s~%keyargs: ~s" gf l)))
971
972
973	(defun bad-key-error (key varg l)
974	(let* ((keys (%svref varg 1))
975	(gf (combined-method-gf (%svref varg 2)))
976	(print-array t)
977	(print-readably t)
978	(readable-keys (format nil "~s" keys)))
979	(signal-program-error "Bad keyword ~s to ~s.~%keyargs: ~s~%allowable keys are ~a." key gf l readable-keys)))
980
981	; vector arg is (vector key-index keyvect combined-method) ; the next combined method
982
983	(defun %%check-keywords (vector-arg args)
984	(flet ((do-it (vector-arg args)
985	(let* ((args-len (length args))
986	(keyvect (%svref vector-arg 1))
987	(keyvect-len (length keyvect))
988	(key-index (%svref vector-arg 0)))
989	; vector arg is (vector key-index keyvect combined-method) ; the next combined method
990	(declare (fixnum args-len key-index keyvect-len))
991	(when (>= args-len key-index)
992	(let* ((keys-in (- args-len key-index))) ; actually * 2
993	(declare (fixnum key-index keys-in keyvect-len))
994	(when (logbitp 0 keys-in) (odd-keys-error vector-arg (collect-lexpr-args args key-index args-len)))
995	(unless (%cadr (%pl-search (nthcdr key-index args) :allow-other-keys))
996	(do ((i key-index (+ i 2))
997	(kargs (nthcdr key-index args) (cddr kargs)))
998	((eq i args-len))
999	(declare (fixnum i))
1000	(let ((key (car kargs)))
1001	(when (not (or (eq key :allow-other-keys)
1002	(dotimes (i keyvect-len nil)
1003	(if (eq key (%svref keyvect i))
1004	(return t)))))
1005	(bad-key-error key vector-arg (collect-lexpr-args args key-index args-len))
1006	))))))
1007	(let ((method (%svref vector-arg 2)))
1008	; magic here ?? not needed
1009	(apply method args)))))
1010	(if (listp args)
1011	(do-it vector-arg args)
1012	(with-list-from-lexpr (args-list args)
1013	(do-it vector-arg args-list)))))
1014
1015
1016
1017
1018
1019
1020	;;; called from %%call-next-method-with-args - its the key-or-init-fn
1021	;;; called from call-next-method-with-args - just check the blooming keys
1022	;;; dont invoke any methods - maybe use x%%check-keywords with last vector elt nil
1023	; means dont call any methods - but need the gf or method for error message
1024	(defun x-%%check-keywords (vector-arg ARGS)
1025	;(declare (dynamic-extent args))
1026	; vector arg is (vector key-index keyvect unused)
1027	(let* ((ARGS-LEN (length args))
1028	(keyvect (%svref vector-arg 1))
1029	(keyvect-len (length keyvect))
1030	(key-index (%svref vector-arg 0))
1031	(keys-in (- args-len key-index))
1032	aok) ; actually * 2
1033	(declare (fixnum args-len key-index keys-in keyvect-len))
1034
1035	(when (logbitp 0 keys-in) (odd-keys-error vector-arg (collect-lexpr-args args key-index args-len)))
1036	(do ((i key-index (+ i 2))
1037	(kargs (nthcdr key-index args) (cddr kargs)))
1038	((eq i args-len))
1039	(declare (fixnum i))
1040	(when aok (return))
1041	(let ((key (car kargs)))
1042	(when (and (eq key :allow-other-keys)
1043	(cadr kargs))
1044	(return))
1045	(when (not (dotimes (i keyvect-len nil)
1046	(if (eq key (%svref keyvect i))
1047	(return t))))
1048	; not found - is :allow-other-keys t in rest of user args
1049	(when (not (do ((remargs kargs (cddr remargs)))
1050	((null remargs) nil)
1051	(when (and (eq (car remargs) :allow-other-keys)
1052	(cadr remargs))
1053	(setq aok t)
1054	(return t))))
1055	(bad-key-error key vector-arg
1056	(collect-lexpr-args args key-index args-len))))))))
1057	#\| ; testing
1058	(setq keyvect #(:a :b ))
1059	(setq foo (make-array 3))
1060	(setf (aref foo 0) keyvect (aref foo 1) 2)
1061	(setf (aref foo 2)(method window-close (window)))
1062	( %%check-keywords 1 2 :a 3 :c 4 foo)
1063	( %%check-keywords 1 2 :a 3 :b 4 :d foo)
1064	\|#
1065
1066
1067
1068
1069
1070	;;; Map an effective-method to it's generic-function.
1071	;;; This is only used for effective-method's which are not combined-method's
1072	;;; (e.g. those created by non-STANDARD method-combination)
1073	(defvar effective-method-gfs (make-hash-table :test 'eq :weak :key))
1074
1075
1076	(defun get-combined-method (method-list gf)
1077	(let ((cm (gethash-combined-method method-list)))
1078	(when cm
1079	(setq gf (combined-method-gf gf))
1080	(if (combined-method-p cm)
1081	(and (eq (combined-method-gf cm) gf) cm)
1082	(and (eq (gethash cm effective-method-gfs) gf) cm)))))
1083
1084	(defun put-combined-method (method-list cm gf)
1085	(unless (%method-function-p cm) ; don't bother with non-combined methods
1086	(puthash-combined-method method-list cm)
1087	(unless (combined-method-p cm)
1088	(setf (gethash cm effective-method-gfs) (combined-method-gf gf))))
1089	cm)
1090
1091	(defun make-standard-combined-method-internal (methods gf &optional
1092	keywords
1093	(ok-if-no-primaries
1094	(null methods)))
1095	(let ((method-list (and methods (compute-method-list methods nil))))
1096	(if method-list ; no applicable primary methods
1097	(if (atom method-list)
1098	(%method.function method-list) ; can jump right to the method-function
1099	(progn
1100	(incf returned-combined-methods) ; dont need this
1101	(if (contains-call-next-method-with-args-p method-list)
1102	(make-cnm-combined-method gf methods method-list keywords)
1103	(or (get-combined-method method-list gf)
1104	(progn
1105	(incf consed-combined-methods) ; dont need this
1106	(puthash-combined-method
1107	method-list
1108	(%cons-combined-method
1109	gf method-list #'%%standard-combined-method-dcode)))))))
1110	(if ok-if-no-primaries
1111	(make-no-applicable-method-function (combined-method-gf gf))
1112	(no-applicable-primary-method gf methods)))))
1113
1114	; Initialized after the initialization (generic) functions exist.
1115	(defvar initialization-functions-alist nil)
1116
1117	;;; This could be in-line above, but I was getting confused.
1118
1119	;;; ok
1120	(defun make-cnm-combined-method (gf methods method-list keywords)
1121	(setq gf (combined-method-gf gf))
1122	(let ((key (cons methods method-list)))
1123	(or (get-combined-method key gf)
1124	(let* (key-or-init-arg
1125	key-or-init-fn)
1126	(if keywords
1127	(let* ((bits (inner-lfun-bits gf))
1128	(numreq (ldb $lfbits-numreq bits))
1129	(key-index (+ numreq (ldb $lfbits-numopt bits))))
1130	(setq key-or-init-arg (vector key-index keywords gf))
1131	(setq key-or-init-fn #'x-%%check-keywords))
1132	(let ((init-cell (assq gf initialization-functions-alist)))
1133	(when init-cell
1134	(setq key-or-init-arg init-cell)
1135	(setq key-or-init-fn #'%%cnm-with-args-check-initargs))))
1136	(incf consed-combined-methods)
1137	(let* ((vect (vector gf methods key-or-init-arg key-or-init-fn method-list))
1138	(self (%cons-combined-method
1139	gf vect #'%%cnm-with-args-combined-method-dcode)))
1140	;(setf (svref vect 4) self)
1141	(puthash-combined-method ; if testing 1 2 3 dont put in our real table
1142	key
1143	self))))))
1144
1145
1146	(defparameter check-call-next-method-with-args t)
1147
1148	(defun contains-call-next-method-with-args-p (method-list)
1149	(when check-call-next-method-with-args
1150	(let ((methods method-list)
1151	method)
1152	(loop
1153	(setq method (pop methods))
1154	(unless methods (return nil))
1155	(unless (listp method)
1156	(if (logbitp $lfbits-nextmeth-with-args-bit
1157	(lfun-bits (%method.function method)))
1158	(return t)))))))
1159
1160	;;; The METHODS arg is a sorted list of applicable methods. Returns
1161	;;; the method-list expected by
1162	;;; %%before-and-after-combined-method-dcode or a single method, or
1163	;;; NIL if there are no applicable primaries
1164	(defun compute-method-list (methods &optional (sub-dispatch? t))
1165	(let (arounds befores primaries afters qs)
1166	(dolist (m methods)
1167	(setq qs (%method.qualifiers m))
1168	(if qs
1169	(if (cdr qs)
1170	(%invalid-method-error
1171	m "Multiple method qualifiers not allowed in ~s method combination"
1172	'standard)
1173	(case (car qs)
1174	(:before (push m befores))
1175	(:after (push m afters))
1176	(:around (push m arounds))
1177	(t (%invalid-method-error m "~s is not one of ~s, ~s, and ~s."
1178	(car qs) :before :after :around))))
1179	(push m primaries)))
1180	(setq primaries (nreverse primaries)
1181	arounds (nreverse arounds)
1182	befores (nreverse befores))
1183	(unless sub-dispatch?
1184	(setq primaries (nremove-uncallable-next-methods primaries)
1185	arounds (nremove-uncallable-next-methods arounds)))
1186	(flet ((next-method-bit-p (method)
1187	(logbitp $lfbits-nextmeth-bit
1188	(lfun-bits (%method.function method)))))
1189	(unless (null primaries) ; return NIL if no applicable primary methods
1190	(when (and arounds
1191	(not sub-dispatch?)
1192	(not (next-method-bit-p (car (last arounds)))))
1193	;; Arounds don't call-next-method, can't get to befores,
1194	;; afters, or primaries
1195	(setq primaries arounds
1196	arounds nil
1197	befores nil
1198	afters nil))
1199	(if (and (null befores) (null afters)
1200	(progn
1201	(when arounds
1202	(setq primaries (nconc arounds primaries)
1203	arounds nil)
1204	(unless sub-dispatch?
1205	(setq primaries (nremove-uncallable-next-methods primaries))))
1206	t)
1207	(null (cdr primaries))
1208	(not (next-method-bit-p (car primaries))))
1209	(car primaries) ; single method, no call-next-method
1210	(let ((method-list primaries))
1211	(if (or befores afters)
1212	(setq method-list (cons befores (cons afters method-list))))
1213	(nconc arounds method-list)))))))
1214
1215
1216
1217	(defun %invalid-method-error (method format-string &rest format-args)
1218	(error "~s is an invalid method.~%~?" method format-string format-args))
1219
1220	(defun %method-combination-error (format-string &rest args)
1221	(apply #'error format-string args))
1222
1223
1224
1225	(defun combined-method-gf (gf-or-cm)
1226	(let ((gf gf-or-cm))
1227	(while (combined-method-p gf)
1228	(setq gf (lfun-name gf)))
1229	gf))
1230
1231
1232	(defun nth-arg-combined-method-trap-0 (gf-or-cm table wrapper args)
1233	(let* ((argnum (%gf-dispatch-table-argnum table))
1234	(arg (nth argnum args)))
1235	(nth-arg-combined-method-trap gf-or-cm table argnum args arg wrapper)))
1236
1237
1238	(defun nth-arg-combined-method-trap (gf-or-cm table argnum args &optional
1239	(arg (nth-or-gf-error
1240	argnum args gf-or-cm))
1241	(wrapper (arg-wrapper arg)))
1242	;; Here when we can't find the method in the dispatch table.
1243	;; Compute it and add it to the table. This code will remain in Lisp.
1244	(multiple-value-bind (combined-method sub-dispatch?)
1245	(compute-nth-arg-combined-method
1246	gf-or-cm (%gf-dispatch-table-methods table) argnum args
1247	wrapper)
1248	(multiple-value-bind (index obsolete-wrappers-p)
1249	(find-gf-dispatch-table-index table wrapper)
1250	(if index
1251	(if (%gf-dispatch-table-store-conditional table (%i+ index 1) combined-method)
1252	(setf (%gf-dispatch-table-ref table index) wrapper))
1253	(grow-gf-dispatch-table gf-or-cm wrapper combined-method obsolete-wrappers-p)))
1254	(if sub-dispatch?
1255	(let ((table (%combined-method-methods combined-method)))
1256	(nth-arg-combined-method-trap
1257	combined-method
1258	table
1259	(%gf-dispatch-table-argnum table)
1260	args))
1261	combined-method)))
1262
1263	;;; Returns (values combined-method sub-dispatch?)
1264	;;; If sub-dispatch? is true, need to compute a combined-method on the
1265	;;; next arg.
1266	(defun compute-nth-arg-combined-method (gf methods argnum args &optional
1267	(wrapper (arg-wrapper
1268	(nth-or-gf-error
1269	argnum args gf))))
1270	(let* ((cpl (%inited-class-cpl (%wrapper-class wrapper)))
1271	(real-gf (combined-method-gf gf))
1272	(mc (%gf-method-combination real-gf))
1273	(standard-mc? (eq mc standard-method-combination))
1274	applicable-methods eql-methods specializers specializer sub-dispatch?)
1275	(dolist (method methods)
1276	;;(require-type method 'standard-method) ; for debugging.
1277	(setq specializers (nthcdr argnum (%method.specializers method))
1278	specializer (%car specializers))
1279	(when (if (typep specializer 'eql-specializer)
1280	(when (cpl-memq (%wrapper-class
1281	(arg-wrapper (eql-specializer-object specializer))) cpl)
1282	(push method eql-methods))
1283	(when (cpl-memq specializer cpl)
1284	(push method applicable-methods)))
1285	(if (contains-non-t-specializer? (%cdr specializers))
1286	(setq sub-dispatch? t))))
1287	(if (or eql-methods applicable-methods)
1288	(if (or (not standard-mc?)
1289	(contains-primary-method? applicable-methods)
1290	(contains-primary-method? eql-methods))
1291	(let ((cpls (args-cpls args)))
1292	(if eql-methods
1293	(make-eql-combined-method
1294	eql-methods applicable-methods cpls gf argnum sub-dispatch? mc)
1295	(if sub-dispatch?
1296	(values (make-n+1th-arg-combined-method applicable-methods gf argnum)
1297	t)
1298	(if standard-mc?
1299	(make-standard-combined-method applicable-methods cpls gf)
1300	(compute-effective-method-function
1301	real-gf mc (sort-methods applicable-methods
1302	(args-cpls args)
1303	(%gf-precedence-list real-gf)))))))
1304	(no-applicable-primary-method
1305	real-gf
1306	(sort-methods (append eql-methods applicable-methods)
1307	(args-cpls args)
1308	(%gf-precedence-list real-gf))))
1309	(make-no-applicable-method-function real-gf))))
1310
1311	(defun nth-or-gf-error (n l gf)
1312	(do* ((i 0 (1+ i))
1313	(l l (cdr l)))
1314	((null l) (dcode-too-few-args i gf))
1315	(declare (fixnum i))
1316	(if (= i n)
1317	(return (car l)))))
1318
1319	(defun contains-non-t-specializer? (specializer-list)
1320	(dolist (s specializer-list nil)
1321	(unless (eq t-class s)
1322	(return t))))
1323
1324	(defun contains-primary-method? (method-list)
1325	(dolist (m method-list nil)
1326	(if (null (%method.qualifiers m))
1327	(return t))))
1328
1329	(defun args-cpls (args &aux res)
1330	(dolist (arg args)
1331	(push (%inited-class-cpl (%wrapper-class (arg-wrapper arg))) res))
1332	(nreverse res))
1333
1334
1335	(defun compute-eql-combined-method-hash-table-threshold (&optional (iters 1000000) (max 200))
1336	(flet ((time-assq (cnt iters)
1337	(let ((alist (loop for i from 1 to cnt collect (cons i i)))
1338	(start-time (get-internal-run-time))
1339	(j 0)
1340	res)
1341	(declare (fixnum j))
1342	(dotimes (i iters)
1343	(declare (fixnum i))
1344	(setq res (cdr (assq j alist)))
1345	(when (>= (incf j) cnt) (setq j 0)))
1346	(values (- (get-internal-run-time) start-time) res)))
1347	(time-hash (cnt iters)
1348	(let ((hash (make-hash-table :test 'eq))
1349	start-time
1350	(j 0)
1351	res)
1352	(declare (fixnum j))
1353	(dotimes (i cnt)
1354	(setf (gethash i hash) i))
1355	(assert-hash-table-readonly hash)
1356	(setq start-time (get-internal-run-time))
1357	(dotimes (i iters)
1358	(declare (fixnum i))
1359	(setq res (gethash i hash))
1360	(when (>= (incf j) cnt) (setq j 0)))
1361	(values (- (get-internal-run-time) start-time) res))))
1362	(dotimes (i max)
1363	(let ((time-assq (time-assq i iters))
1364	(time-hash (time-hash i iters)))
1365	(format t "i: ~d, assq: ~d, hash: ~d~%" i time-assq time-hash)
1366	(when (> time-assq time-hash) (return i))))))
1367
1368	;; Value computed on a dual-core 2.4 GHz AMD Opteron running FC3
1369	;; This isn't the result of compute-eql-combined-method-hash-table-threshold,
1370	;; it's the value at which assq takes 3/4 the time of hash, which weights
1371	;; towards the worst case of the eql method, not the average for uniform inputs.
1372	(defparameter eql-combined-method-hash-table-threshold 45)
1373
1374	;;; A vector might be a little faster than an alist, but the hash table case
1375	;;; will speed up large numbers of methods.
1376	(defun make-eql-combined-method (eql-methods methods cpls gf argnum sub-dispatch? &optional
1377	(method-combination standard-method-combination))
1378	(let ((eql-ms (copy-list eql-methods))
1379	(precedence-list (%gf-precedence-list (combined-method-gf gf)))
1380	(standard-mc? (eq method-combination standard-method-combination))
1381	(real-gf (combined-method-gf gf))
1382	eql-method-alist
1383	(can-use-eq? t))
1384	(unless sub-dispatch?
1385	(setq methods (sort-methods methods cpls precedence-list)))
1386	(while eql-ms
1387	(let ((eql-element (eql-specializer-object (nth argnum (%method.specializers (car eql-ms)))))
1388	(this-element-methods eql-ms)
1389	cell last-cell)
1390	(if (or (and (numberp eql-element) (not (fixnump eql-element)))
1391	(macptrp eql-element))
1392	(setq can-use-eq? nil))
1393	(setf eql-ms (%cdr eql-ms)
1394	(%cdr this-element-methods) nil
1395	cell eql-ms)
1396	(while cell
1397	(if (eql eql-element
1398	(eql-specializer-object (nth argnum (%method.specializers (car cell)))))
1399	(let ((cell-save cell))
1400	(if last-cell
1401	(setf (%cdr last-cell) (cdr cell))
1402	(setq eql-ms (cdr eql-ms)))
1403	(setf cell (cdr cell)
1404	(%cdr cell-save) this-element-methods
1405	this-element-methods cell-save))
1406	(setq last-cell cell
1407	cell (cdr cell))))
1408	(let* ((sorted-methods
1409	(sort-methods (nreconc (copy-list this-element-methods)
1410	(copy-list methods))
1411	cpls
1412	precedence-list))
1413	(method-list (and standard-mc? (compute-method-list sorted-methods sub-dispatch?))))
1414	(when (or (not standard-mc?)
1415	(memq method-list this-element-methods)
1416	(and (consp method-list)
1417	(labels ((member-anywhere (tem mlist)
1418	(member tem mlist
1419	:test #'(lambda (tem el)
1420	(if (listp el)
1421	(member-anywhere tem el)
1422	(member el tem))))))
1423	(member-anywhere this-element-methods method-list))))
1424	; Do EQL comparison only if the EQL methods can run
1425	; (e.g. does not come after a primary method that does not call-next-method)
1426	(push (cons eql-element
1427	(if sub-dispatch?
1428	(make-n+1th-arg-combined-method
1429	sorted-methods gf argnum)
1430	(if standard-mc?
1431	(make-standard-combined-method sorted-methods nil gf)
1432	(compute-effective-method-function
1433	real-gf method-combination sorted-methods))))
1434	eql-method-alist)))))
1435	;;eql-method-alist has (element . combined-method) pairs.
1436	;;for now, we're going to use assq or assoc
1437	(let ((default-method (if sub-dispatch?
1438	(make-n+1th-arg-combined-method
1439	methods gf argnum)
1440	(if standard-mc?
1441	(make-standard-combined-method methods nil gf t)
1442	(compute-effective-method-function
1443	real-gf method-combination methods)))))
1444	(if eql-method-alist
1445	(if (> (length eql-method-alist) eql-combined-method-hash-table-threshold)
1446	(let ((hash (make-hash-table :test (if can-use-eq? 'eq 'eql))))
1447	(dolist (pair eql-method-alist)
1448	(setf (gethash (car pair) hash) (cdr pair)))
1449	(assert-hash-table-readonly hash)
1450	(%cons-combined-method
1451	gf (cons argnum (cons hash default-method))
1452	#'%%hash-table-combined-method-dcode))
1453	(%cons-combined-method
1454	gf (cons argnum (cons eql-method-alist default-method))
1455	(if can-use-eq?
1456	#'%%assq-combined-method-dcode
1457	#'%%assoc-combined-method-dcode)))
1458	default-method))))
1459
1460
1461	(defun %%assq-combined-method-dcode (stuff args)
1462	;; stuff is (argnum eql-method-list . default-method)
1463	;(declare (dynamic-extent args))
1464	(if (listp args)
1465	(let* ((args-len (list-length args))
1466	(argnum (car stuff)))
1467	(when (>= argnum args-len)(signal-program-error "Too few args to ~s." (%method-gf (cddr stuff))))
1468	(let* ((arg (nth argnum args))
1469	(thing (assq arg (cadr stuff)))) ; are these things methods or method-functions? - fns
1470	(if thing
1471	(apply (cdr thing) args)
1472	(apply (cddr stuff) args))))
1473	(let* ((args-len (%lexpr-count args))
1474	(argnum (car stuff)))
1475	(when (>= argnum args-len)(signal-program-error "Too few args to ~s." (%method-gf (cddr stuff))))
1476	(let* ((arg (%lexpr-ref args args-len argnum))
1477	(thing (assq arg (cadr stuff))))
1478	(if thing
1479	(%apply-lexpr (cdr thing) args)
1480	(%apply-lexpr (cddr stuff) args))))))
1481
1482
1483	(DEFun %%assoc-combined-method-dcode (stuff args)
1484	;; stuff is (argnum eql-method-list . default-method)
1485	;(declare (dynamic-extent args))
1486	(if (listp args)
1487	(let* ((args-len (list-length args))
1488	(argnum (car stuff)))
1489	(when (>= argnum args-len)(signal-program-error "Too few args to ~s." (%method-gf (cddr stuff))))
1490	(let* ((arg (nth argnum args))
1491	(thing (assoc arg (cadr stuff)))) ; are these things methods or method-functions?
1492	(if thing
1493	(apply (cdr thing) args)
1494	(apply (cddr stuff) args))))
1495	(let* ((args-len (%lexpr-count args))
1496	(argnum (car stuff)))
1497	(when (>= argnum args-len)(signal-program-error "Too few args to ~s." (%method-gf (cddr stuff))))
1498	(let* ((arg (%lexpr-ref args args-len argnum))
1499	(thing (assoc arg (cadr stuff)))) ; are these things methods or method-functions?
1500	(if thing
1501	(%apply-lexpr (cdr thing) args)
1502	(%apply-lexpr (cddr stuff) args))))))
1503
1504
1505
1506	(defun %%hash-table-combined-method-dcode (stuff args)
1507	;; stuff is (argnum eql-hash-table . default-method)
1508	;(declare (dynamic-extent args))
1509	(if (listp args)
1510	(let* ((args-len (list-length args))
1511	(argnum (car stuff)))
1512	(when (>= argnum args-len)(signal-program-error "Too few args to ~s." (%method-gf (cddr stuff))))
1513	(let* ((arg (nth argnum args)))
1514	(apply (gethash arg (cadr stuff) (cddr stuff)) args)))
1515	(let* ((args-len (%lexpr-count args))
1516	(argnum (car stuff)))
1517	(when (>= argnum args-len)(signal-program-error "Too few args to ~s." (%method-gf (cddr stuff))))
1518	(let* ((arg (%lexpr-ref args args-len argnum)))
1519	(%apply-lexpr (gethash arg (cadr stuff) (cddr stuff)) args)))))
1520
1521
1522	;;; Assumes the two methods have the same number of specializers and
1523	;;; that each specializer of each method is in the corresponding
1524	;;; element of cpls (e.g. cpls is a list of the cpl's for the classes
1525	;;; of args for which both method1 & method2 are applicable.
1526	(defun %method< (method1 method2 cpls)
1527	(let ((s1s (%method.specializers method1))
1528	(s2s (%method.specializers method2))
1529	s1 s2 cpl)
1530	(loop
1531	(if (null s1s)
1532	(return (method-qualifiers< method1 method2)))
1533	(setq s1 (%pop s1s)
1534	s2 (%pop s2s)
1535	cpl (%pop cpls))
1536	(cond ((typep s1 'eql-specializer)
1537	(unless (eq s1 s2)
1538	(return t)))
1539	((typep s2 'eql-specializer) (return nil))
1540	((eq s1 s2))
1541	(t (return (%i< (cpl-index s1 cpl) (cpl-index s2 cpl))))))))
1542
1543	(defun %simple-method< (method1 method2 cpl)
1544	(let ((s1 (%car (%method.specializers method1)))
1545	(s2 (%car (%method.specializers method2))))
1546	(cond ((typep s1 'eql-specializer)
1547	(if (eq s1 s2)
1548	(method-qualifiers< method1 method2)
1549	t))
1550	((typep s2 'eql-specializer) nil)
1551	((eq s1 s2) (method-qualifiers< method1 method2))
1552	(t (%i< (cpl-index s1 cpl) (cpl-index s2 cpl))))))
1553
1554	; Sort methods with argument-precedence-order
1555	(defun %hairy-method< (method1 method2 cpls apo)
1556	(let ((s1s (%method.specializers method1))
1557	(s2s (%method.specializers method2))
1558	s1 s2 cpl index)
1559	(loop
1560	(if (null apo)
1561	(return (method-qualifiers< method1 method2)))
1562	(setq index (pop apo))
1563	(setq s1 (nth index s1s)
1564	s2 (nth index s2s)
1565	cpl (nth index cpls))
1566	(cond ((typep s1 'eql-specializer)
1567	(unless (eq s1 s2)
1568	(return t)))
1569	((typep s2 'eql-specializer) (return nil))
1570	((eq s1 s2))
1571	(t (return (%i< (cpl-index s1 cpl) (cpl-index s2 cpl))))))))
1572
1573	; This can matter if the user removes & reinstalls methods between
1574	; invoking a generic-function and doing call-next-method with args.
1575	; Hence, we need a truly canonical sort order for the methods
1576	; (or a smarter comparison than EQUAL in %%cnm-with-args-check-methods).
1577	(defun method-qualifiers< (method1 method2)
1578	(labels ((qualifier-list< (ql1 ql2 &aux q1 q2)
1579	(cond ((null ql1) (not (null ql2)))
1580	((null ql2) nil)
1581	((eq (setq q1 (car ql1)) (setq q2 (car ql2)))
1582	(qualifier-list< (cdr ql1) (cdr ql2)))
1583	((string-lessp q1 q2) t)
1584	; This isn't entirely correct.
1585	; two qualifiers with the same pname in different packages
1586	; are not comparable here.
1587	; Unfortunately, users can change package names, hence,
1588	; comparing the package names doesn't work either.
1589	(t nil))))
1590	(qualifier-list< (%method.qualifiers method1) (%method.qualifiers method2))))
1591
1592	(defun sort-methods (methods cpls &optional apo)
1593	(cond ((null cpls) methods)
1594	((null (%cdr cpls))
1595	(setq cpls (%car cpls))
1596	(flet ((simple-sort-fn (m1 m2)
1597	(%simple-method< m1 m2 cpls)))
1598	(declare (dynamic-extent #'simple-sort-fn))
1599	(%sort-list-no-key methods #'simple-sort-fn)))
1600	((null apo) ; no unusual argument-precedence-order
1601	(flet ((sort-fn (m1 m2)
1602	(%method< m1 m2 cpls)))
1603	(declare (dynamic-extent #'sort-fn))
1604	(%sort-list-no-key methods #'sort-fn)))
1605	(t ; I guess some people are just plain rude
1606	(flet ((hairy-sort-fn (m1 m2)
1607	(%hairy-method< m1 m2 cpls apo)))
1608	(declare (dynamic-extent #'hairy-sort-fn))
1609	(%sort-list-no-key methods #'hairy-sort-fn)))))
1610
1611	(defun nremove-uncallable-next-methods (methods)
1612	(do ((m methods (%cdr m))
1613	mbits)
1614	((null m))
1615	(setq mbits (lfun-bits (%method.function (%car m))))
1616	(unless (logbitp $lfbits-nextmeth-bit mbits)
1617	(setf (%cdr m) nil)
1618	(return)))
1619	methods)
1620
1621
1622	(defun cpl-index (superclass cpl)
1623	;; This will be table lookup later. Also we'll prelookup the tables
1624	;; in compute-1st-arg-combined-methods above.
1625	(locally (declare (optimize (speed 3)(safety 0)))
1626	(do ((i 0 (%i+ i 1))
1627	(cpl cpl (%cdr cpl)))
1628	((null cpl) nil)
1629	(if (eq superclass (%car cpl))
1630	(return i)))))
1631
1632	(defun cpl-memq (superclass cpl)
1633	(locally (declare (optimize (speed 3)(safety 0)))
1634	(do ((cpl cpl (%cdr cpl)))
1635	((null cpl) nil)
1636	(if (eq superclass (%car cpl))
1637	(return cpl)))))
1638
1639	;;; Combined method interpretation
1640
1641
1642	;;; magic is a list of (cnm-cm (methods) . args) cnm-cm is the
1643	;;; argument checker for call-next-method-with-args or nil could make
1644	;;; it be a cons as a flag that magic has been heap consed - done
1645	;;; could also switch car and cadr if we do &lexpr business then if
1646	;;; cddr is lexpr-p (aka (not listp)) thats the clue also would need
1647	;;; to do lexpr-apply or apply depending on the state.
1648
1649
1650	(defun %%standard-combined-method-dcode (methods args)
1651	;; combined-methods as made by make-combined-method are in methods
1652	;; args are as put there by the caller of the gf.
1653	(let* ((car-meths (car methods))
1654	(cell-2 (cons methods args))
1655	(magic (cons nil cell-2)))
1656	;; i.e. magic is nil methods . args
1657	(declare (dynamic-extent magic)
1658	(dynamic-extent cell-2))
1659	(if (listp car-meths)
1660	(%%before-and-after-combined-method-dcode magic)
1661	(progn
1662	(if (not (cdr methods))
1663	(%rplaca (cdr magic) car-meths)
1664	(%rplaca (cdr magic) (cdr methods)))
1665	; so maybe its a combined-method ?? - no
1666	(apply-with-method-context magic (%method.function car-meths) args)))))
1667
1668	;;; args is list, old-args may be lexpr
1669	(defun cmp-args-old-args (args old-args numreq)
1670	(declare (optimize (speed 3)(safety 0)))
1671	(if (listp old-args)
1672	(do ((newl args (cdr newl))
1673	(oldl old-args (cdr oldl))
1674	(i 0 (1+ i)))
1675	((eql i numreq) t)
1676	(when (neq (car newl)(car oldl))(return nil)))
1677	(let ((len (%lexpr-count old-args)))
1678	(do ((newl args (cdr newl))
1679	(i 0 (1+ i)))
1680	((eql i numreq) t)
1681	(when (neq (car newl)(%lexpr-ref old-args len i))(return nil))))))
1682
1683
1684	; called from call-next-method-with-args with magic supplied and 1st time around with not
1685	(defun %%cnm-with-args-combined-method-dcode (thing args &optional magic) ; was &rest args
1686	;(declare (dynamic-extent args))
1687	; now thing is vector of gf orig methods, arg for key or initarg check, key or initarg fnction
1688	; and our job is to do all the arg checking
1689	(let ()
1690	;; THING is nil in next-method calls for non-standard method combination. To enable
1691	;; checking in that case, would need to change %%call-method* to store a vector in (car magic).
1692	(when (and magic thing)
1693	(flet ((do-it (thing args)
1694	(let* ((args-len (length args))
1695	(gf (svref thing 0)) ; could get this from a method
1696	(numreq (ldb $lfbits-numreq (inner-lfun-bits gf)))
1697	(next-methods (cadr magic)))
1698	;(when (null self)(error "Next method with args context error"))
1699	(when (neq 0 numreq)
1700	; oh screw it - old-args may be lexpr too
1701	(let ((old-args (cddr magic)))
1702	(when (< args-len numreq) (signal-program-error "Too few args to ~S" gf))
1703	(when (null (cmp-args-old-args args old-args numreq))
1704	; required args not eq - usually true, we expect
1705	(let ((new-methods (%compute-applicable-methods* gf args))
1706	(old-methods (svref thing 1)))
1707	(when (not (equal new-methods old-methods))
1708	(error '"Applicable-methods changed in call-next-method.~%~
1709	Should be: ~s~%Was: ~s~%Next-methods: ~s"
1710	old-methods new-methods next-methods))))))
1711	(let ((key-or-init-fn (svref thing 3)))
1712	(when key-or-init-fn
1713	; was apply
1714	(funcall key-or-init-fn (svref thing 2) args))))))
1715	(if (listp args)
1716	(do-it thing args)
1717	(with-list-from-lexpr (args-list args)
1718	(do-it thing args-list)))))
1719	; ok done checking - lets do it
1720	(let* ((methods (if magic (cadr magic)(svref thing 4))) ;<< was 5 this is nil unless cnm with args
1721	; was if magic
1722	(car-meths (car methods))
1723	(cell-2 (cons methods args))
1724	(magic (cons thing cell-2)))
1725	(declare (dynamic-extent magic cell-2))
1726	; i.e. magic is thing methods . args
1727	;(%rplaca magic thing)
1728	;(setf (cadr magic) methods)
1729	;(%rplaca (cdr magic) methods)
1730	;(setf (cddr magic) args)
1731	;(%rplacd (cdr magic) args)
1732	(if (listp car-meths)
1733	(progn
1734	(%%before-and-after-combined-method-dcode magic))
1735	(progn
1736	(if (not (cdr methods))
1737	(%rplaca (cdr magic) car-meths)
1738	(%rplaca (cdr magic) (cdr methods)))
1739	; so maybe its a combined-method ?? - no
1740	(apply-with-method-context magic (%method.function car-meths) args))))))
1741
1742
1743
1744	;;; here if car of methods is listp. methods = (befores afters . primaries)
1745	(defun %%before-and-after-combined-method-dcode (magic)
1746	(declare (list magic))
1747	(let* ((methods (cadr magic))
1748	(befores (car methods))
1749	(cdr-meths (cdr methods))
1750	(primaries (cdr cdr-meths))
1751	(afters (car cdr-meths))
1752	(args (cddr magic)))
1753	(declare (list befores afters primaries))
1754	(when befores
1755	(dolist (method befores)
1756	(rplaca (cdr magic) method)
1757	(apply-with-method-context magic (%method.function method) args)))
1758	(let* ((cdr (cdr primaries))
1759	(method-function (%method.function (car primaries)))) ; guaranteed non nil?
1760	(rplaca (cdr magic) (if (null cdr)(car primaries) cdr))
1761	(if (null afters)
1762	(apply-with-method-context magic method-function args) ; tail call if possible
1763	(multiple-value-prog1
1764	(apply-with-method-context magic method-function args)
1765	(dolist (method afters)
1766	(rplaca (cdr magic) method)
1767	(apply-with-method-context magic (%method.function method) args)))))))
1768
1769
1770	; This is called by the compiler expansion of next-method-p
1771	; I think there's a bug going around... LAP fever! I'm immune
1772	(defun %next-method-p (magic)
1773	(let ((methods (%cadr magic)))
1774	(consp methods)))
1775
1776
1777	(defun %call-next-method (magic &rest args) ; if args supplied they are new ones
1778	(declare (dynamic-extent args))
1779	(if args
1780	(apply #'%call-next-method-with-args magic args)
1781	(let* ((next-methods (%cadr magic))) ; don't get this closed magic stuff
1782	(if (not (consp next-methods))
1783	( %no-next-method magic)
1784	(let ((args (%cddr magic))) ; get original args
1785	;The unwind-protect is needed in case some hacker in his/her wisdom decides to:
1786	; (defmethod foo (x) (catch 'foo (call-next-method)) (call-next-method))
1787	; where the next-method throws to 'foo.
1788	; The alternative is to make a new magic var with args
1789	; actually not that fancy (call-next-method)(call-next-method) is same problem
1790	(let ()
1791	(unwind-protect
1792	(if (listp (car next-methods))
1793	( %%before-and-after-combined-method-dcode magic)
1794	(let ((cdr (cdr next-methods)))
1795	(rplaca (cdr magic)(if (not cdr)(car next-methods) cdr))
1796	(let ((method-function (%method.function (car next-methods))))
1797	(apply-with-method-context magic method-function args))))
1798	(rplaca (cdr magic) next-methods))))))))
1799
1800	;; Note: we need to change the compiler to call this when it can prove that
1801	;; call-next-method cannot be called a second time. I believe thats done.
1802
1803
1804	(defun %tail-call-next-method (magic)
1805	(let* ((next-methods (%cadr magic)) ; or make it car
1806	(args (%cddr magic))) ; get original args
1807	(if (not (consp next-methods)) ; or consp?
1808	( %no-next-method magic)
1809	(if (listp (car next-methods))
1810	( %%before-and-after-combined-method-dcode magic)
1811	(let ((cdr (cdr next-methods)))
1812	(rplaca (cdr magic) (if (not cdr)(car next-methods) cdr))
1813	(apply-with-method-context magic (%method.function (car next-methods)) args))))))
1814
1815	;;; may be simpler to blow another cell so magic looks like
1816	;;; (cnm-cm/nil next-methods . args) - done
1817	;;; and also use first cell to mean heap-consed if itsa cons
1818
1819	(defun %call-next-method-with-args (magic &rest args)
1820	(declare (dynamic-extent args))
1821	(if (null args)
1822	(%call-next-method magic)
1823	(let* ((methods (%cadr magic)))
1824	(if (not (consp methods))
1825	(%no-next-method magic)
1826	(let* ((cnm-cm (car magic)))
1827	; a combined method
1828	(when (consp cnm-cm)(setq cnm-cm (car cnm-cm)))
1829	; could just put the vector in car magic & no self needed in vector?
1830	(let ((the-vect cnm-cm)) ; <<
1831	(funcall #'%%cnm-with-args-combined-method-dcode ;(%combined-method-dcode cnm-cm)
1832	the-vect
1833	args
1834	magic)))))))
1835
1836
1837
1838	; called from x%%call-next-method-with-args - its the key-or-init-fn
1839	(defun %%cnm-with-args-check-initargs (init-cell args)
1840	; here we forget the lexpr idea because it wants to cdr
1841	;(declare (dynamic-extent args))
1842	(let* ((rest (cdr args))
1843	(first-arg (car args)))
1844	(declare (list rest))
1845	(let* ((initargs rest)
1846	(init-function (car init-cell))
1847	(instance (cond ((eq init-function #'update-instance-for-different-class)
1848	(setq initargs (cdr rest))
1849	(car rest))
1850	((eq init-function #'shared-initialize)
1851	(setq initargs (cdr rest))
1852	first-arg)
1853	((eq init-function #'update-instance-for-redefined-class)
1854	(setq initargs (%cdddr rest))
1855	first-arg)
1856	(t first-arg)))
1857	(class (class-of instance))
1858	bad-initarg)
1859	(dolist (functions (cdr init-cell)
1860	(error "Bad initarg: ~s to call-next-method for ~s~%on ~s"
1861	bad-initarg instance (car init-cell)))
1862	(multiple-value-bind
1863	(errorp bad-key)
1864	(if (eq (car functions) #'initialize-instance)
1865	(apply #'check-initargs instance class initargs nil
1866	#'initialize-instance #'allocate-instance #'shared-initialize
1867	nil)
1868	(apply #'check-initargs instance class initargs nil functions))
1869	(if errorp
1870	(unless bad-initarg (setq bad-initarg bad-key))
1871	(return t)))))))
1872
1873
1874
1875	(defun %no-next-method (magic)
1876	(let* ((method (%cadr magic)))
1877	(if (consp method) (setq method (car method)))
1878	(unless (typep method 'standard-method)
1879	(error "call-next-method called outside of generic-function dispatch context.~@
1880	Usually indicates an error in a define-method-combination form."))
1881	(let ((args (cddr magic))
1882	(gf (%method.gf method)))
1883	(if (listp args)
1884	(apply #'no-next-method gf method args)
1885	(%apply-lexpr #'no-next-method gf method args)))))
1886
1887
1888
1889
1890	;;; This makes a consed version of the magic first arg to a method.
1891	;;; Called when someone closes over the magic arg. (i.e. does (george
1892	;;; #'call-next-method))
1893
1894	(defun %cons-magic-next-method-arg (magic)
1895	; car is a cons as a flag that its already heap-consed! - else cnm-cm or nil
1896	(if (consp (car magic))
1897	magic
1898	(list* (list (car magic))
1899	(if (consp (%cadr magic))
1900	(copy-list (%cadr magic)) ; is this copy needed - probably not
1901	(cadr magic))
1902	(let ((args (%cddr magic)))
1903	(if (listp args)
1904	(copy-list args)
1905	(let* ((len (%lexpr-count args))
1906	(l (make-list len)))
1907	(do ((i 0 (1+ i))
1908	(list l (cdr list)))
1909	((null list))
1910	(%rplaca list (%lexpr-ref args len i)))
1911	l))))))
1912
1913
1914	; Support CALL-METHOD in DEFINE-METHOD-COMBINATION
1915	(defun %%call-method* (method next-methods args)
1916	(let* ((method-function (%method.function method))
1917	(bits (lfun-bits method-function)))
1918	(declare (fixnum bits))
1919	(if (not (and (logbitp $lfbits-nextmeth-bit bits)
1920	(logbitp $lfbits-method-bit bits)))
1921	(if (listp args)
1922	(apply method-function args)
1923	(%apply-lexpr method-function args))
1924	(let* ((cell-2 (cons next-methods args))
1925	(magic (cons nil cell-2)))
1926	(declare (dynamic-extent magic)
1927	(dynamic-extent cell-2))
1928	(if (null next-methods)
1929	(%rplaca (cdr magic) method))
1930	(apply-with-method-context magic method-function args)))))
1931
1932	; Error checking version for user's to call
1933	(defun %call-method* (method next-methods args)
1934	(let* ((method-function (%method.function method))
1935	(bits (lfun-bits method-function)))
1936	(declare (fixnum bits))
1937	(if (not (and (logbitp $lfbits-nextmeth-bit bits)
1938	(logbitp $lfbits-method-bit bits)))
1939	(progn
1940	(require-type method 'standard-method)
1941	(if (listp args)
1942	(apply method-function args)
1943	(%apply-lexpr method-function args)))
1944	(progn
1945	(do* ((list next-methods (cdr list)))
1946	((null list))
1947	(when (not (listp list))
1948	(%err-disp $XIMPROPERLIST next-methods))
1949	(when (not (standard-method-p (car list)))
1950	(report-bad-arg (car list) 'standard-method)))
1951	(let* ((cell-2 (cons next-methods args))
1952	(magic (cons nil cell-2)))
1953	(declare (dynamic-extent magic)
1954	(dynamic-extent cell-2))
1955	(if (null next-methods)
1956	(%rplaca (cdr magic) method))
1957	(apply-with-method-context magic method-function args))))))
1958
1959
1960

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