1 ;;;; This software is part of the SBCL system. See the README file for
4 ;;;; This software is derived from software originally released by Xerox
5 ;;;; Corporation. Copyright and release statements follow. Later modifications
6 ;;;; to the software are in the public domain and are provided with
7 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
10 ;;;; copyright information from original PCL sources:
12 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
13 ;;;; All rights reserved.
15 ;;;; Use and copying of this software and preparation of derivative works based
16 ;;;; upon this software are permitted. Any distribution of this software or
17 ;;;; derivative works must comply with all applicable United States export
20 ;;;; This software is made available AS IS, and Xerox Corporation makes no
21 ;;;; warranty about the software, its performance or its conformity to any
28 ;;; Methods themselves are simple inanimate objects. Most properties of
29 ;;; methods are immutable, methods cannot be reinitialized. The following
30 ;;; properties of methods can be changed:
31 ;;; METHOD-GENERIC-FUNCTION
35 ;;; Error checking is done in before methods. Because of the simplicity of
36 ;;; standard method objects the standard primary method can fill the slots.
38 ;;; Methods are not reinitializable.
40 (define-condition metaobject-initialization-violation
41 (reference-condition simple-error
)
44 (defun change-class-to-metaobject-violation (to-name
45 &optional from-name references
)
46 (error 'metaobject-initialization-violation
47 :format-control
"~@<Cannot ~S~@[ ~S~] objects into ~S metaobjects.~@:>"
48 :format-arguments
(list 'change-class from-name to-name
)
49 :references references
))
51 (macrolet ((def (name args control
)
52 `(defmethod ,name
,args
53 (declare (ignore initargs
))
54 (error 'metaobject-initialization-violation
55 ;; FIXME: I'm pretty sure this wants to be "~~@<~A~~@:>"
56 :format-control
,(coerce (format nil
"~@<~A~@:>" control
)
58 :format-arguments
(list ',name
)
59 :references
(list '(:amop
:initialization method
))))))
60 (def reinitialize-instance
((method method
) &rest initargs
)
61 "Method objects cannot be redefined by ~S.")
62 (def change-class
((method method
) new
&rest initargs
)
63 "Method objects cannot be redefined by ~S.")
64 ;; NEW being a subclass of method is dealt with in the general
65 ;; method of CHANGE-CLASS
66 (def update-instance-for-redefined-class
((method method
) added discarded
68 "No behaviour specified for ~S on method objects.")
69 (def update-instance-for-different-class
(old (new method
) &rest initargs
)
70 "No behaviour specified for ~S on method objects.")
71 (def update-instance-for-different-class
((old method
) new
&rest initargs
)
72 "No behaviour specified for ~S on method objects."))
74 (define-condition invalid-method-initarg
(simple-program-error)
75 ((method :initarg
:method
:reader invalid-method-initarg-method
))
78 (format s
"~@<In initialization of ~S:~2I~_~?~@:>"
79 (invalid-method-initarg-method c
)
80 (simple-condition-format-control c
)
81 (simple-condition-format-arguments c
)))))
83 (defun invalid-method-initarg (method format-control
&rest args
)
84 (error 'invalid-method-initarg
:method method
85 :format-control format-control
:format-arguments args
))
87 (defun check-documentation (method doc
)
88 (unless (or (null doc
) (stringp doc
))
89 (invalid-method-initarg method
"~@<~S of ~S is neither ~S nor a ~S.~@:>"
90 :documentation doc
'null
'string
)))
91 (defun check-lambda-list (method ll
)
92 (declare (ignore method ll
))
95 (defun check-method-function (method fun
)
96 (unless (functionp fun
)
97 (invalid-method-initarg method
"~@<~S of ~S is not a ~S.~@:>"
98 :function fun
'function
)))
100 (defun check-qualifiers (method qualifiers
)
101 (flet ((improper-list ()
102 (invalid-method-initarg method
103 "~@<~S of ~S is an improper list.~@:>"
104 :qualifiers qualifiers
)))
105 (dolist-carefully (q qualifiers improper-list
)
106 (unless (and q
(atom q
))
107 (invalid-method-initarg method
108 "~@<~S, in ~S ~S, is not a non-~S atom.~@:>"
109 q
:qualifiers qualifiers
'null
)))))
111 (defun check-slot-name (method name
)
112 (declare (ignore method
))
113 (unless (symbolp name
)
114 (invalid-method-initarg "~@<~S of ~S is not a ~S.~@:>"
115 :slot-name name
'symbol
)))
117 (defun check-specializers (method specializers
)
118 (flet ((improper-list ()
119 (invalid-method-initarg method
120 "~@<~S of ~S is an improper list.~@:>"
121 :specializers specializers
)))
122 (dolist-carefully (s specializers improper-list
)
123 (unless (specializerp s
)
124 (invalid-method-initarg method
125 "~@<~S, in ~S ~S, is not a ~S.~@:>"
126 s
:specializers specializers
'specializer
)))
127 ;; KLUDGE: ANSI says that it's not valid to have methods
128 ;; specializing on classes which are "not defined", leaving
129 ;; unclear what the definedness of a class is; AMOP suggests that
130 ;; forward-referenced-classes, since they have proper names and
131 ;; all, are at least worthy of some level of definition. We allow
132 ;; methods specialized on forward-referenced-classes, but it's
133 ;; non-portable and potentially dubious, so
134 (let ((frcs (remove-if-not #'forward-referenced-class-p specializers
)))
136 (style-warn "~@<Defining a method using ~
137 ~V[~;~1{~S~}~;~1{~S and ~S~}~:;~{~#[~;and ~]~S~^, ~}~] ~
138 as ~2:*~V[~;a specializer~:;specializers~].~@:>"
139 (length frcs
) frcs
)))))
141 (defmethod shared-initialize :before
142 ((method standard-method
) slot-names
&key
143 qualifiers lambda-list specializers function documentation
)
144 (declare (ignore slot-names
))
145 ;; FIXME: it's not clear to me (CSR, 2006-08-09) why methods get
146 ;; this extra paranoia and nothing else does; either everything
147 ;; should be aggressively checking initargs, or nothing much should.
148 ;; In either case, it would probably be better to have :type
149 ;; declarations in slots, which would then give a suitable type
150 ;; error (if we implement type-checking for slots...) rather than
151 ;; this hand-crafted thing.
152 (check-qualifiers method qualifiers
)
153 (check-lambda-list method lambda-list
)
154 (check-specializers method specializers
)
155 (check-method-function method function
)
156 (check-documentation method documentation
))
158 (defmethod shared-initialize :before
159 ((method standard-accessor-method
) slot-names
&key
160 slot-name slot-definition
)
161 (declare (ignore slot-names
))
162 (unless slot-definition
163 (check-slot-name method slot-name
)))
165 (defmethod shared-initialize :after
((method standard-method
) slot-names
166 &rest initargs
&key
((method-cell method-cell
)))
167 (declare (ignore slot-names method-cell
))
168 (initialize-method-function initargs method
))
170 (defvar *the-class-generic-function
*
171 (find-class 'generic-function
))
172 (defvar *the-class-standard-generic-function
*
173 (find-class 'standard-generic-function
))
175 (defmethod shared-initialize :before
176 ((generic-function standard-generic-function
)
178 &key
(lambda-list () lambda-list-p
)
179 argument-precedence-order
182 (method-class nil method-class-supplied-p
)
183 (method-combination nil method-combination-supplied-p
))
184 (declare (ignore slot-names
185 declarations argument-precedence-order documentation
186 lambda-list lambda-list-p
))
188 (flet ((initarg-error (initarg value string
)
189 (error "when initializing the generic function ~S:~%~
190 The ~S initialization argument was: ~A.~%~
192 generic-function initarg value string
)))
193 (cond (method-class-supplied-p
194 (when (symbolp method-class
)
195 (setq method-class
(find-class method-class
)))
196 (unless (and (classp method-class
)
197 (*subtypep
(class-eq-specializer method-class
)
199 (initarg-error :method-class
201 "a subclass of the class METHOD"))
202 (setf (slot-value generic-function
'method-class
) method-class
))
203 ((slot-boundp generic-function
'method-class
))
205 (initarg-error :method-class
207 "a subclass of the class METHOD")))
208 (cond (method-combination-supplied-p
209 (unless (method-combination-p method-combination
)
210 (initarg-error :method-combination
212 "a method combination object")))
213 ((slot-boundp generic-function
'%method-combination
))
215 (initarg-error :method-combination
217 "a method combination object")))))
219 (defun find-generic-function (name &optional
(errorp t
))
220 (let ((fun (and (fboundp name
) (fdefinition name
))))
222 ((and fun
(typep fun
'generic-function
)) fun
)
223 (errorp (error "No generic function named ~S." name
))
226 (defun real-add-named-method (generic-function-name qualifiers
227 specializers lambda-list
&rest other-initargs
)
228 (unless (and (fboundp generic-function-name
)
229 (typep (fdefinition generic-function-name
) 'generic-function
))
230 (warn 'implicit-generic-function-warning
:name generic-function-name
))
231 (let* ((existing-gf (find-generic-function generic-function-name nil
))
234 (ensure-generic-function
235 generic-function-name
236 :generic-function-class
(class-of existing-gf
))
237 (ensure-generic-function generic-function-name
)))
238 (proto (method-prototype-for-gf generic-function-name
)))
239 ;; FIXME: Destructive modification of &REST list.
240 (setf (getf (getf other-initargs
'plist
) :name
)
241 (make-method-spec generic-function qualifiers specializers
))
242 (let ((new (apply #'make-instance
(class-of proto
)
243 :qualifiers qualifiers
:specializers specializers
244 :lambda-list lambda-list other-initargs
)))
245 (add-method generic-function new
)
248 (define-condition find-method-length-mismatch
249 (reference-condition simple-error
)
251 (:default-initargs
:references
(list '(:ansi-cl
:function find-method
))))
253 (defun real-get-method (generic-function qualifiers specializers
255 always-check-specializers
)
256 (let ((lspec (length specializers
))
257 (methods (generic-function-methods generic-function
)))
258 (when (or methods always-check-specializers
)
259 (let ((nreq (length (arg-info-metatypes (gf-arg-info
260 generic-function
)))))
261 ;; Since we internally bypass FIND-METHOD by using GET-METHOD
262 ;; instead we need to to this here or users may get hit by a
263 ;; failed AVER instead of a sensible error message.
264 (when (/= lspec nreq
)
266 'find-method-length-mismatch
268 "~@<The generic function ~S takes ~D required argument~:P; ~
269 was asked to find a method with specializers ~S~@:>"
270 :format-arguments
(list generic-function nreq specializers
)))))
272 (dolist (method methods
)
273 (let ((mspecializers (method-specializers method
)))
274 (aver (= lspec
(length mspecializers
)))
275 (when (and (equal qualifiers
(safe-method-qualifiers method
))
276 (every #'same-specializer-p specializers
277 (method-specializers method
)))
282 (error "~@<There is no method on ~S with ~
283 ~:[no qualifiers~;~:*qualifiers ~S~] ~
284 and specializers ~S.~@:>"
285 generic-function qualifiers specializers
))))))
287 (defmethod find-method ((generic-function standard-generic-function
)
288 qualifiers specializers
&optional
(errorp t
))
289 ;; ANSI about FIND-METHOD: "The specializers argument contains the
290 ;; parameter specializers for the method. It must correspond in
291 ;; length to the number of required arguments of the generic
292 ;; function, or an error is signaled."
294 ;; This error checking is done by REAL-GET-METHOD.
296 generic-function qualifiers
297 ;; ANSI for FIND-METHOD seems to imply that in fact specializers
298 ;; should always be passed in parsed form instead of being parsed
299 ;; at this point. Since there's no ANSI-blessed way of getting an
300 ;; EQL specializer, that seems unnecessarily painful, so we are
301 ;; nice to our users. -- CSR, 2007-06-01
302 ;; Note that INTERN-EQL-SPECIALIZER is exported from SB-MOP, but MOP isn't
303 ;; part of the ANSI standard. Parsing introduces a tiny semantic problem in
304 ;; the edge case of an EQL specializer whose object is literally (EQL :X).
305 ;; That one must be supplied as a pre-parsed #<EQL-SPECIALIZER> because if
306 ;; not, we'd parse it into a specializer whose object is :X.
307 (parse-specializers generic-function specializers
) errorp t
))
309 ;;; Compute various information about a generic-function's arglist by looking
310 ;;; at the argument lists of the methods. The hair for trying not to use
311 ;;; &REST arguments lives here.
312 ;;; The values returned are:
313 ;;; number-of-required-arguments
314 ;;; the number of required arguments to this generic-function's
315 ;;; discriminating function
317 ;;; whether or not this generic-function's discriminating
318 ;;; function takes an &rest argument.
319 ;;; specialized-argument-positions
320 ;;; a list of the positions of the arguments this generic-function
321 ;;; specializes (e.g. for a classical generic-function this is the
323 (defmethod compute-discriminating-function-arglist-info
324 ((generic-function standard-generic-function
))
325 ;;(declare (values number-of-required-arguments &rest-argument-p
326 ;; specialized-argument-postions))
327 (let ((number-required nil
)
329 (specialized-positions ())
330 (methods (generic-function-methods generic-function
)))
331 (dolist (method methods
)
332 (multiple-value-setq (number-required restp specialized-positions
)
333 (compute-discriminating-function-arglist-info-internal
334 generic-function method number-required restp specialized-positions
)))
335 (values number-required restp
(sort specialized-positions
#'<))))
337 (defun compute-discriminating-function-arglist-info-internal
338 (generic-function method number-of-requireds restp
339 specialized-argument-positions
)
340 (declare (ignore generic-function
)
341 (type (or null fixnum
) number-of-requireds
))
343 (declare (fixnum requireds
))
344 ;; Go through this methods arguments seeing how many are required,
345 ;; and whether there is an &rest argument.
346 (dolist (arg (method-lambda-list method
))
347 (cond ((eq arg
'&aux
) (return))
348 ((memq arg
'(&optional
&rest
&key
))
349 (return (setq restp t
)))
350 ((memq arg lambda-list-keywords
))
351 (t (incf requireds
))))
352 ;; Now go through this method's type specifiers to see which
353 ;; argument positions are type specified. Treat T specially
354 ;; in the usual sort of way. For efficiency don't bother to
355 ;; keep specialized-argument-positions sorted, rather depend
356 ;; on our caller to do that.
358 (dolist (type-spec (method-specializers method
))
359 (unless (eq type-spec
*the-class-t
*)
360 (pushnew pos specialized-argument-positions
:test
#'eq
))
362 ;; Finally merge the values for this method into the values
363 ;; for the exisiting methods and return them. Note that if
364 ;; num-of-requireds is NIL it means this is the first method
365 ;; and we depend on that.
366 (values (min (or number-of-requireds requireds
) requireds
)
368 (and number-of-requireds
(/= number-of-requireds requireds
)))
369 specialized-argument-positions
)))
371 (defun make-discriminating-function-arglist (number-required-arguments restp
)
372 (nconc (let ((args nil
))
373 (dotimes (i number-required-arguments
)
374 (push (format-symbol *package
* ;; ! is this right?
375 "Discriminating Function Arg ~D"
380 `(&rest
,(format-symbol *package
*
381 "Discriminating Function &rest Arg")))))
383 (defmethod generic-function-argument-precedence-order
384 ((gf standard-generic-function
))
385 (aver (eq **boot-state
** 'complete
))
386 (loop with arg-info
= (gf-arg-info gf
)
387 with lambda-list
= (arg-info-lambda-list arg-info
)
388 for argument-position in
(arg-info-precedence arg-info
)
389 collect
(nth argument-position lambda-list
)))
391 (defmethod generic-function-lambda-list ((gf generic-function
))
394 (defmethod gf-fast-method-function-p ((gf standard-generic-function
))
395 (gf-info-fast-mf-p (slot-value gf
'arg-info
)))
397 (defmethod initialize-instance :after
((gf standard-generic-function
)
398 &key
(lambda-list nil lambda-list-p
)
399 argument-precedence-order
)
400 (with-slots (arg-info) gf
403 :lambda-list lambda-list
404 :argument-precedence-order argument-precedence-order
)
406 (when (arg-info-valid-p arg-info
)
409 (defmethod reinitialize-instance :around
410 ((gf standard-generic-function
) &rest args
&key
411 (lambda-list nil lambda-list-p
) (argument-precedence-order nil apo-p
))
412 (let ((old-mc (generic-function-method-combination gf
)))
413 (prog1 (call-next-method)
414 ;; KLUDGE: EQ is too strong a test.
415 (unless (eq old-mc
(generic-function-method-combination gf
))
416 (flush-effective-method-cache gf
))
418 ((and lambda-list-p apo-p
)
420 :lambda-list lambda-list
421 :argument-precedence-order argument-precedence-order
))
422 (lambda-list-p (set-arg-info gf
:lambda-list lambda-list
))
423 (t (set-arg-info gf
)))
424 (when (arg-info-valid-p (gf-arg-info gf
))
426 (map-dependents gf
(lambda (dependent)
427 (apply #'update-dependent gf dependent args
))))))
429 (declaim (special *lazy-dfun-compute-p
*))
431 (defun set-methods (gf methods
)
432 (setf (generic-function-methods gf
) nil
)
433 (loop (when (null methods
) (return gf
))
434 (real-add-method gf
(pop methods
) methods
)))
436 (define-condition new-value-specialization
(reference-condition error
)
437 ((%method
:initarg
:method
:reader new-value-specialization-method
))
440 (format s
"~@<Cannot add method ~S to ~S, as it specializes the ~
441 new-value argument.~@:>"
442 (new-value-specialization-method c
)
443 #'(setf slot-value-using-class
))))
444 (:default-initargs
:references
445 (list '(:sbcl
:node
"Metaobject Protocol")
446 '(:amop
:generic-function
(setf slot-value-using-class
)))))
448 (defgeneric values-for-add-method
(gf method
)
449 (:method
((gf standard-generic-function
) (method standard-method
))
450 ;; KLUDGE: Just a single generic dispatch, and everything else
451 ;; comes from permutation vectors. Would be nicer to define
452 ;; REAL-ADD-METHOD with a proper method so that we could efficiently
453 ;; use SLOT-VALUE there.
455 ;; Optimization note: REAL-ADD-METHOD has a lot of O(N) stuff in it (as
456 ;; does PCL as a whole). It should not be too hard to internally store
457 ;; many of the things we now keep in lists as either purely functional
458 ;; O(log N) sets, or --if we don't mind the memory cost-- using
459 ;; specialized hash-tables: most things are used to answer questions about
460 ;; set-membership, not ordering.
461 (values (slot-value gf
'%lock
)
462 (slot-value method
'qualifiers
)
463 (slot-value method
'specializers
)
464 (slot-value method
'lambda-list
)
465 (slot-value method
'%generic-function
)
466 (slot-value gf
'name
))))
468 (define-condition print-object-stream-specializer
(reference-condition simple-warning
)
471 :references
(list '(:ansi-cl
:function print-object
))
472 :format-control
"~@<Specializing on the second argument to ~S has ~
473 unportable effects, and also interferes with ~
474 precomputation of print functions for exceptional ~
476 :format-arguments
(list 'print-object
)))
478 (defun defer-ftype-computation (gf)
479 ;; Is there any reason not to do this as soon as possible?
480 ;; While doing it with every ADD/REMOVE-METHOD call could result in
481 ;; wasted work, it seems like unnecessary complexity.
482 ;; I think it's just to get through bootstrap, probably,
483 ;; but if it's a semantics thing, it deserves some explanation.
484 (let ((name (generic-function-name gf
)))
485 (when (legal-fun-name-p name
) ; tautological ?
486 (unless (eq (info :function
:where-from name
) :declared
)
487 (when (and (fboundp name
) (eq (fdefinition name
) gf
))
488 (setf (info :function
:type name
) :generic-function
))))))
490 (defun compute-gf-ftype (name)
491 (let ((gf (and (fboundp name
) (fdefinition name
))))
492 (if (generic-function-p gf
)
493 (let* ((ll (generic-function-lambda-list gf
))
494 ;; If the GF has &REST without &KEY then we don't augment
495 ;; the FTYPE with keywords, so as not to complain about keywords
496 ;; which seem not to be accepted.
497 (type (sb-c::ftype-from-lambda-list
498 (if (and (member '&rest ll
) (not (member '&key ll
)))
500 (generic-function-pretty-arglist gf
)))))
501 ;; It would be nice if globaldb were transactional,
502 ;; so that either both updates or neither occur.
503 (setf (info :function
:type name
) type
504 (info :function
:where-from name
) :defined-method
)
506 ;; The defaulting expression for (:FUNCTION :TYPE) does not store
507 ;; the default. For :GENERIC-FUNCTION that is not FBOUNDP we also
508 ;; don't, however this branch should never be reached because the
509 ;; info only stores :GENERIC-FUNCTION when methods are loaded.
510 ;; Maybe AVER that it does not happen?
511 (sb-c::ftype-from-fdefn name
))))
513 (defun real-add-method (generic-function method
&optional skip-dfun-update-p
)
514 (flet ((similar-lambda-lists-p (old-method new-lambda-list
)
515 (binding* (((a-llks a-nreq a-nopt
)
516 (analyze-lambda-list (method-lambda-list old-method
)))
517 ((b-llks b-nreq b-nopt
)
518 (analyze-lambda-list new-lambda-list
)))
519 (and (= a-nreq b-nreq
)
521 (eq (ll-keyp-or-restp a-llks
)
522 (ll-keyp-or-restp b-llks
))))))
523 (multiple-value-bind (lock qualifiers specializers new-lambda-list
525 (values-for-add-method generic-function method
)
527 (error "~@<The method ~S is already part of the generic ~
528 function ~S; it can't be added to another generic ~
529 function until it is removed from the first one.~@:>"
531 (when (and (eq name
'print-object
) (not (eq (second specializers
) *the-class-t
*)))
532 (warn 'print-object-stream-specializer
))
534 ;; System lock because interrupts need to be disabled as
535 ;; well: it would be bad to unwind and leave the gf in an
536 ;; inconsistent state.
537 (sb-thread::with-recursive-system-lock
(lock)
538 (let ((existing (get-method generic-function
543 ;; If there is already a method like this one then we must get
544 ;; rid of it before proceeding. Note that we call the generic
545 ;; function REMOVE-METHOD to remove it rather than doing it in
546 ;; some internal way.
547 (when (and existing
(similar-lambda-lists-p existing new-lambda-list
))
548 (remove-method generic-function existing
))
550 ;; KLUDGE: We have a special case here, as we disallow
551 ;; specializations of the NEW-VALUE argument to (SETF
552 ;; SLOT-VALUE-USING-CLASS). GET-ACCESSOR-METHOD-FUNCTION is
553 ;; the optimizing function here: it precomputes the effective
554 ;; method, assuming that there is no dispatch to be done on
555 ;; the new-value argument.
556 (when (and (eq generic-function
#'(setf slot-value-using-class
))
557 (not (eq *the-class-t
* (first specializers
))))
558 (error 'new-value-specialization
:method method
))
560 (setf (method-generic-function method
) generic-function
)
561 (pushnew method
(generic-function-methods generic-function
) :test
#'eq
)
562 (dolist (specializer specializers
)
563 (add-direct-method specializer method
))
565 ;; KLUDGE: SET-ARG-INFO contains the error-detecting logic for
566 ;; detecting attempts to add methods with incongruent lambda
567 ;; lists. However, according to Gerd Moellmann on cmucl-imp,
568 ;; it also depends on the new method already having been added
569 ;; to the generic function. Therefore, we need to remove it
571 (let ((remove-again-p t
))
574 (set-arg-info generic-function
:new-method method
)
575 (setq remove-again-p nil
))
577 (remove-method generic-function method
))))
579 ;; KLUDGE II: ANSI saith that it is not an error to add a
580 ;; method with invalid qualifiers to a generic function of the
581 ;; wrong kind; it's only an error at generic function
582 ;; invocation time; I dunno what the rationale was, and it
583 ;; sucks. Nevertheless, it's probably a programmer error, so
584 ;; let's warn anyway. -- CSR, 2003-08-20
585 (let ((mc (generic-function-method-combination generic-functioN
)))
587 ((eq mc
*standard-method-combination
*)
588 (when (and qualifiers
590 (not (memq (car qualifiers
)
591 '(:around
:before
:after
)))))
592 (warn "~@<Invalid qualifiers for standard method ~
593 combination in method ~S:~2I~_~S.~@:>"
595 ((short-method-combination-p mc
)
596 (let ((mc-name (method-combination-type-name mc
)))
597 (when (or (null qualifiers
)
599 (and (neq (car qualifiers
) :around
)
600 (neq (car qualifiers
) mc-name
)))
601 (warn "~@<Invalid qualifiers for ~S method combination ~
602 in method ~S:~2I~_~S.~@:>"
603 mc-name method qualifiers
))))))
604 (unless skip-dfun-update-p
605 (update-ctors 'add-method
606 :generic-function generic-function
608 (update-dfun generic-function
))
609 (defer-ftype-computation generic-function
)
610 (map-dependents generic-function
612 (update-dependent generic-function
613 dep
'add-method method
)))))
614 (serious-condition (c)
618 (defun real-remove-method (generic-function method
)
619 (when (eq generic-function
(method-generic-function method
))
620 (flush-effective-method-cache generic-function
)
621 (let ((lock (gf-lock generic-function
)))
622 ;; System lock because interrupts need to be disabled as well:
623 ;; it would be bad to unwind and leave the gf in an inconsistent
625 (sb-thread::with-recursive-system-lock
(lock)
626 (let* ((specializers (method-specializers method
))
627 (methods (generic-function-methods generic-function
))
628 (new-methods (remove method methods
)))
629 (setf (method-generic-function method
) nil
630 (generic-function-methods generic-function
) new-methods
)
631 (dolist (specializer specializers
)
632 (remove-direct-method specializer method
))
633 (set-arg-info generic-function
)
634 (update-ctors 'remove-method
635 :generic-function generic-function
637 (update-dfun generic-function
)
638 (defer-ftype-computation generic-function
)
639 (map-dependents generic-function
641 (update-dependent generic-function
642 dep
'remove-method method
)))))))
645 (defun compute-applicable-methods-function (generic-function arguments
)
646 (values (compute-applicable-methods-using-types
648 (types-from-args generic-function arguments
'eql
))))
650 (defmethod compute-applicable-methods
651 ((generic-function generic-function
) arguments
)
652 (values (compute-applicable-methods-using-types
654 (types-from-args generic-function arguments
'eql
))))
656 (defmethod compute-applicable-methods-using-classes
657 ((generic-function generic-function
) classes
)
658 (compute-applicable-methods-using-types
660 (types-from-args generic-function classes
'class-eq
)))
662 (defun !proclaim-incompatible-superclasses
(classes)
663 (setq classes
(mapcar (lambda (class)
668 (dolist (class classes
)
669 (dolist (other-class classes
)
670 (unless (eq class other-class
)
671 (pushnew other-class
(class-incompatible-superclass-list class
) :test
#'eq
)))))
673 (defun superclasses-compatible-p (class1 class2
)
674 (let ((cpl1 (cpl-or-nil class1
))
675 (cpl2 (cpl-or-nil class2
)))
677 (dolist (ic (class-incompatible-superclass-list sc1
))
679 (return-from superclasses-compatible-p nil
))))))
682 #'!proclaim-incompatible-superclasses
683 '(;; superclass class
684 (system-class std-class structure-class
) ; direct subclasses of pcl-class
685 (standard-class funcallable-standard-class
)
686 ;; superclass metaobject
687 (class eql-specializer class-eq-specializer method method-combination
688 generic-function slot-definition
)
689 ;; metaclass built-in-class
690 (number sequence character
; direct subclasses of t, but not array
691 standard-object structure-object
) ; or symbol
692 (number array character symbol
; direct subclasses of t, but not
693 standard-object structure-object
) ; sequence
694 (complex float rational
) ; direct subclasses of number
695 (integer ratio
) ; direct subclasses of rational
696 (list vector
) ; direct subclasses of sequence
697 (cons null
) ; direct subclasses of list
698 (string bit-vector
) ; direct subclasses of vector
701 (defmethod same-specializer-p ((specl1 specializer
) (specl2 specializer
))
704 (defmethod same-specializer-p ((specl1 class
) (specl2 class
))
707 (defmethod specializer-class ((specializer class
))
710 (defmethod same-specializer-p ((specl1 class-eq-specializer
)
711 (specl2 class-eq-specializer
))
712 (eq (specializer-class specl1
) (specializer-class specl2
)))
714 ;; FIXME: This method is wacky, and indicative of a coding style in which
715 ;; metaphorically the left hand does not know what the right is doing.
716 ;; If you want this to be the abstract comparator, and you "don't know"
717 ;; that EQL-specializers are interned, then the comparator should be EQL.
718 ;; But if you *do* know that they're interned, then why does this method
719 ;; exist at all? The method on SPECIALIZER works fine.
720 (defmethod same-specializer-p ((specl1 eql-specializer
)
721 (specl2 eql-specializer
))
722 ;; A bit of deception to confuse the enemy?
723 (eq (specializer-object specl1
) (specializer-object specl2
)))
725 (defmethod specializer-class ((specializer eql-specializer
))
726 (class-of (slot-value specializer
'object
)))
728 (defun specializer-class-or-nil (specializer)
729 (and (standard-specializer-p specializer
)
730 (specializer-class specializer
)))
732 (defun error-need-at-least-n-args (function n
)
733 (error 'simple-program-error
734 :format-control
"~@<The function ~2I~_~S ~I~_requires ~
735 at least ~W argument~:P.~:>"
736 :format-arguments
(list function n
)))
738 (defun types-from-args (generic-function arguments
&optional type-modifier
)
739 (multiple-value-bind (nreq applyp metatypes nkeys arg-info
)
740 (get-generic-fun-info generic-function
)
741 (declare (ignore applyp metatypes nkeys
))
742 (let ((types-rev nil
))
743 (dotimes-fixnum (i nreq
)
745 (error-need-at-least-n-args (generic-function-name generic-function
)
747 (let ((arg (pop arguments
)))
748 (push (if type-modifier
`(,type-modifier
,arg
) arg
) types-rev
)))
749 (values (nreverse types-rev
) arg-info
))))
751 (defun get-wrappers-from-classes (nkeys wrappers classes metatypes
)
752 (let* ((w wrappers
) (w-tail w
) (mt-tail metatypes
))
753 (dolist (class (ensure-list classes
))
754 (unless (eq t
(car mt-tail
))
755 (let ((c-w (class-wrapper class
)))
756 (unless c-w
(return-from get-wrappers-from-classes nil
))
759 (setf (car w-tail
) c-w
760 w-tail
(cdr w-tail
)))))
761 (setq mt-tail
(cdr mt-tail
)))
764 (defun sdfun-for-caching (gf classes
)
765 (let ((types (mapcar #'class-eq-type classes
)))
766 (multiple-value-bind (methods all-applicable-and-sorted-p
)
767 (compute-applicable-methods-using-types gf types
)
768 (let ((generator (get-secondary-dispatch-function1
769 gf methods types nil t all-applicable-and-sorted-p
)))
770 (make-callable gf methods generator
771 nil
(mapcar #'class-wrapper classes
))))))
773 (defun value-for-caching (gf classes
)
774 (let ((methods (compute-applicable-methods-using-types
775 gf
(mapcar #'class-eq-type classes
))))
776 (method-plist-value (car methods
) :constant-value
)))
778 (defun default-secondary-dispatch-function (generic-function)
780 (let ((methods (compute-applicable-methods generic-function args
)))
782 (let ((emf (get-effective-method-function generic-function
784 (invoke-emf emf args
))
785 (call-no-applicable-method generic-function args
)))))
788 (loop (when (atom x
) (return (eq x y
)))
789 (when (atom y
) (return nil
))
790 (unless (eq (car x
) (car y
)) (return nil
))
794 (defvar *std-cam-methods
* nil
)
796 (defun compute-applicable-methods-emf (generic-function)
797 (if (eq **boot-state
** 'complete
)
798 (let* ((cam (gdefinition 'compute-applicable-methods
))
799 (cam-methods (compute-applicable-methods-using-types
800 cam
(list `(eql ,generic-function
) t
))))
801 (values (get-effective-method-function cam cam-methods
)
803 (or *std-cam-methods
*
804 (setq *std-cam-methods
*
805 (compute-applicable-methods-using-types
806 cam
(list `(eql ,cam
) t
)))))))
807 (values #'compute-applicable-methods-function t
)))
809 (defun compute-applicable-methods-emf-std-p (gf)
810 (gf-info-c-a-m-emf-std-p (gf-arg-info gf
)))
812 (defvar *old-c-a-m-gf-methods
* nil
)
814 (defun update-all-c-a-m-gf-info (c-a-m-gf)
815 (let ((methods (generic-function-methods c-a-m-gf
)))
816 (if (and *old-c-a-m-gf-methods
*
817 (every (lambda (old-method)
818 (member old-method methods
:test
#'eq
))
819 *old-c-a-m-gf-methods
*))
820 (let ((gfs-to-do nil
)
821 (gf-classes-to-do nil
))
822 (dolist (method methods
)
823 (unless (member method
*old-c-a-m-gf-methods
* :test
#'eq
)
824 (let ((specl (car (method-specializers method
))))
825 (if (eql-specializer-p specl
)
826 (pushnew (specializer-object specl
) gfs-to-do
:test
#'eq
)
827 (pushnew (specializer-class specl
) gf-classes-to-do
:test
#'eq
)))))
828 (map-all-generic-functions
830 (when (or (member gf gfs-to-do
:test
#'eq
)
831 (dolist (class gf-classes-to-do nil
)
833 (class-precedence-list (class-of gf
))
835 (update-c-a-m-gf-info gf
)))))
836 (map-all-generic-functions #'update-c-a-m-gf-info
))
837 (setq *old-c-a-m-gf-methods
* methods
)))
839 (defun update-gf-info (gf)
840 (update-c-a-m-gf-info gf
)
841 (update-gf-simple-accessor-type gf
))
843 (defun update-c-a-m-gf-info (gf)
844 (unless (early-gf-p gf
)
845 (multiple-value-bind (c-a-m-emf std-p
)
846 (compute-applicable-methods-emf gf
)
847 (let ((arg-info (gf-arg-info gf
)))
848 (setf (gf-info-static-c-a-m-emf arg-info
) c-a-m-emf
)
849 (setf (gf-info-c-a-m-emf-std-p arg-info
) std-p
)))))
851 (defun update-gf-simple-accessor-type (gf)
852 (let ((arg-info (gf-arg-info gf
)))
853 (setf (gf-info-simple-accessor-type arg-info
)
854 (let* ((methods (generic-function-methods gf
))
855 (class (and methods
(class-of (car methods
))))
858 (cond ((or (eq class
*the-class-standard-reader-method
*)
859 (eq class
*the-class-global-reader-method
*))
861 ((or (eq class
*the-class-standard-writer-method
*)
862 (eq class
*the-class-global-writer-method
*))
864 ((or (eq class
*the-class-standard-boundp-method
*)
865 (eq class
*the-class-global-boundp-method
*))
867 (when (and (gf-info-c-a-m-emf-std-p arg-info
)
869 (dolist (method (cdr methods
) t
)
870 (unless (eq class
(class-of method
)) (return nil
)))
871 (eq (generic-function-method-combination gf
)
872 *standard-method-combination
*))
876 ;;; CMUCL (Gerd's PCL, 2002-04-25) comment:
878 ;;; Return two values. First value is a function to be stored in
879 ;;; effective slot definition SLOTD for reading it with
880 ;;; SLOT-VALUE-USING-CLASS, setting it with (SETF
881 ;;; SLOT-VALUE-USING-CLASS) or testing it with
882 ;;; SLOT-BOUNDP-USING-CLASS. GF is one of these generic functions,
883 ;;; TYPE is one of the symbols READER, WRITER, BOUNDP. CLASS is
886 ;;; Second value is true if the function returned is one of the
887 ;;; optimized standard functions for the purpose, which are used
888 ;;; when only standard methods are applicable.
890 ;;; FIXME: Change all these wacky function names to something sane.
891 (defun get-accessor-method-function (gf type class slotd
)
892 (let* ((std-method (standard-svuc-method type
))
893 (str-method (structure-svuc-method type
))
894 (types1 `((eql ,class
) (class-eq ,class
) (eql ,slotd
)))
895 (types (if (eq type
'writer
) `(t ,@types1
) types1
))
896 (methods (compute-applicable-methods-using-types gf types
))
897 (std-p (null (cdr methods
))))
900 (get-optimized-std-accessor-method-function class slotd type
)
901 (let* ((optimized-std-fun
902 (get-optimized-std-slot-value-using-class-method-function
905 `((,(car (or (member std-method methods
:test
#'eq
)
906 (member str-method methods
:test
#'eq
)
908 'get-accessor-method-function
)))
909 ,optimized-std-fun
)))
911 (let ((wrappers (list (layout-of class
)
912 (class-wrapper class
)
914 (if (eq type
'writer
)
915 (cons (class-wrapper *the-class-t
*) wrappers
)
917 (sdfun (get-secondary-dispatch-function
918 gf methods types method-alist wrappers
)))
919 (get-accessor-from-svuc-method-function class slotd sdfun type
)))
922 ;;; used by OPTIMIZE-SLOT-VALUE-BY-CLASS-P (vector.lisp)
923 (defun update-slot-value-gf-info (gf type
)
925 (update-std-or-str-methods gf type
))
926 (when (and (standard-svuc-method type
) (structure-svuc-method type
))
927 (flet ((update-accessor-info (class)
928 (when (class-finalized-p class
)
929 (dolist (slotd (class-slots class
))
930 (compute-slot-accessor-info slotd type gf
)))))
932 (update-accessor-info *new-class
*)
933 (map-all-classes #'update-accessor-info
'slot-object
)))))
935 (defvar *standard-slot-value-using-class-method
* nil
)
936 (defvar *standard-setf-slot-value-using-class-method
* nil
)
937 (defvar *standard-slot-boundp-using-class-method
* nil
)
938 (defvar *condition-slot-value-using-class-method
* nil
)
939 (defvar *condition-setf-slot-value-using-class-method
* nil
)
940 (defvar *condition-slot-boundp-using-class-method
* nil
)
941 (defvar *structure-slot-value-using-class-method
* nil
)
942 (defvar *structure-setf-slot-value-using-class-method
* nil
)
943 (defvar *structure-slot-boundp-using-class-method
* nil
)
945 (defun standard-svuc-method (type)
947 (reader *standard-slot-value-using-class-method
*)
948 (writer *standard-setf-slot-value-using-class-method
*)
949 (boundp *standard-slot-boundp-using-class-method
*)))
951 (defun set-standard-svuc-method (type method
)
953 (reader (setq *standard-slot-value-using-class-method
* method
))
954 (writer (setq *standard-setf-slot-value-using-class-method
* method
))
955 (boundp (setq *standard-slot-boundp-using-class-method
* method
))))
957 (defun condition-svuc-method (type)
959 (reader *condition-slot-value-using-class-method
*)
960 (writer *condition-setf-slot-value-using-class-method
*)
961 (boundp *condition-slot-boundp-using-class-method
*)))
963 (defun set-condition-svuc-method (type method
)
965 (reader (setq *condition-slot-value-using-class-method
* method
))
966 (writer (setq *condition-setf-slot-value-using-class-method
* method
))
967 (boundp (setq *condition-slot-boundp-using-class-method
* method
))))
969 (defun structure-svuc-method (type)
971 (reader *structure-slot-value-using-class-method
*)
972 (writer *structure-setf-slot-value-using-class-method
*)
973 (boundp *structure-slot-boundp-using-class-method
*)))
975 (defun set-structure-svuc-method (type method
)
977 (reader (setq *structure-slot-value-using-class-method
* method
))
978 (writer (setq *structure-setf-slot-value-using-class-method
* method
))
979 (boundp (setq *structure-slot-boundp-using-class-method
* method
))))
981 (defun update-std-or-str-methods (gf type
)
982 (dolist (method (generic-function-methods gf
))
983 (let ((specls (method-specializers method
)))
984 (when (and (or (not (eq type
'writer
))
985 (eq (pop specls
) *the-class-t
*))
986 (every #'classp specls
))
987 (cond ((and (eq (class-name (car specls
)) 'std-class
)
988 (eq (class-name (cadr specls
)) 'standard-object
)
989 (eq (class-name (caddr specls
))
990 'standard-effective-slot-definition
))
991 (set-standard-svuc-method type method
))
992 ((and (eq (class-name (car specls
)) 'condition-class
)
993 (eq (class-name (cadr specls
)) 'condition
)
994 (eq (class-name (caddr specls
))
995 'condition-effective-slot-definition
))
996 (set-condition-svuc-method type method
))
997 ((and (eq (class-name (car specls
)) 'structure-class
)
998 (eq (class-name (cadr specls
)) 'structure-object
)
999 (eq (class-name (caddr specls
))
1000 'structure-effective-slot-definition
))
1001 (set-structure-svuc-method type method
)))))))
1003 (defun mec-all-classes-internal (spec precompute-p
)
1004 (let ((wrapper (class-wrapper (specializer-class spec
))))
1005 (unless (or (not wrapper
) (invalid-wrapper-p wrapper
))
1006 (cons (specializer-class spec
)
1009 (not (or (eq spec
*the-class-t
*)
1010 (eq spec
*the-class-slot-object
*)
1011 (eq spec
*the-class-standard-object
*)
1012 (eq spec
*the-class-structure-object
*)))
1013 (let ((sc (class-direct-subclasses spec
)))
1015 (mapcan (lambda (class)
1016 (mec-all-classes-internal class precompute-p
))
1019 (defun mec-all-classes (spec precompute-p
)
1020 (let ((classes (mec-all-classes-internal spec precompute-p
)))
1021 (if (null (cdr classes
))
1023 (let* ((a-classes (cons nil classes
))
1025 (loop (when (null (cdr tail
))
1026 (return (cdr a-classes
)))
1027 (let ((class (cadr tail
))
1028 (ttail (cddr tail
)))
1029 (if (dolist (c ttail nil
)
1030 (when (eq class c
) (return t
)))
1031 (setf (cdr tail
) (cddr tail
))
1032 (setf tail
(cdr tail
)))))))))
1034 (defun mec-all-class-lists (spec-list precompute-p
)
1035 (if (null spec-list
)
1037 (let* ((car-all-classes (mec-all-classes (car spec-list
)
1039 (all-class-lists (mec-all-class-lists (cdr spec-list
)
1041 (mapcan (lambda (list)
1042 (mapcar (lambda (c) (cons c list
)) car-all-classes
))
1045 (defun make-emf-cache (generic-function valuep cache classes-list new-class
)
1046 (let* ((arg-info (gf-arg-info generic-function
))
1047 (nkeys (arg-info-nkeys arg-info
))
1048 (metatypes (arg-info-metatypes arg-info
))
1049 (wrappers (unless (eq nkeys
1) (make-list nkeys
)))
1050 (precompute-p (gf-precompute-dfun-and-emf-p arg-info
)))
1051 (flet ((add-class-list (classes)
1052 (when (or (null new-class
) (memq new-class classes
))
1053 (let ((%wrappers
(get-wrappers-from-classes
1054 nkeys wrappers classes metatypes
)))
1055 (when (and %wrappers
(not (probe-cache cache %wrappers
)))
1056 (let ((value (cond ((eq valuep t
)
1057 (sdfun-for-caching generic-function
1059 ((eq valuep
:constant-value
)
1060 (value-for-caching generic-function
1062 ;; need to get them again, as finalization might
1063 ;; have happened in between, which would
1064 ;; invalidate wrappers.
1065 (let ((wrappers (get-wrappers-from-classes
1066 nkeys wrappers classes metatypes
)))
1067 (when (if (atom wrappers
)
1068 (not (invalid-wrapper-p wrappers
))
1069 (every (complement #'invalid-wrapper-p
)
1071 (setq cache
(fill-cache cache wrappers value
))))))))))
1073 (mapc #'add-class-list classes-list
)
1074 (dolist (method (generic-function-methods generic-function
))
1075 (mapc #'add-class-list
1076 (mec-all-class-lists (method-specializers method
)
1080 (defmacro class-test
(arg class
)
1082 ((eq class
*the-class-t
*) t
)
1083 ((eq class
*the-class-slot-object
*)
1084 `(not (typep (classoid-of ,arg
) 'system-classoid
)))
1085 ((eq class
*the-class-standard-object
*)
1086 `(or (std-instance-p ,arg
) (fsc-instance-p ,arg
)))
1087 ((eq class
*the-class-funcallable-standard-object
*)
1088 `(fsc-instance-p ,arg
))
1090 `(typep ,arg
',(class-name class
)))))
1092 (defmacro class-eq-test
(arg class
)
1093 `(eq (class-of ,arg
) ',class
))
1095 (defmacro eql-test
(arg object
)
1096 `(eql ,arg
',object
))
1098 (defun dnet-methods-p (form)
1100 (or (eq (car form
) 'methods
)
1101 (eq (car form
) 'unordered-methods
))))
1103 ;;; This is CASE, but without gensyms.
1104 (defmacro scase
(arg &rest clauses
)
1105 `(let ((.case-arg.
,arg
))
1106 (cond ,@(mapcar (lambda (clause)
1107 (list* (cond ((null (car clause
))
1109 ((consp (car clause
))
1110 (if (null (cdar clause
))
1115 ((member (car clause
) '(t otherwise
))
1118 `(eql .case-arg.
',(car clause
))))
1123 (defmacro mcase
(arg &rest clauses
) `(scase ,arg
,@clauses
))
1125 (defun generate-discrimination-net (generic-function methods types sorted-p
)
1126 (let* ((arg-info (gf-arg-info generic-function
))
1127 (c-a-m-emf-std-p (gf-info-c-a-m-emf-std-p arg-info
))
1128 (precedence (arg-info-precedence arg-info
)))
1129 (generate-discrimination-net-internal
1130 generic-function methods types
1131 (lambda (methods known-types
)
1133 (and c-a-m-emf-std-p
1135 (let ((sorted-methods nil
))
1137 (copy-list methods
) precedence
1139 (when sorted-methods
(return-from one-order-p nil
))
1140 (setq sorted-methods methods
)))
1141 (setq methods sorted-methods
))
1143 `(methods ,methods
,known-types
)
1144 `(unordered-methods ,methods
,known-types
)))
1145 (lambda (position type true-value false-value
)
1146 (let ((arg (dfun-arg-symbol position
)))
1147 (if (eq (car type
) 'eql
)
1148 (let* ((false-case-p (and (consp false-value
)
1149 (or (eq (car false-value
) 'scase
)
1150 (eq (car false-value
) 'mcase
))
1151 (eq arg
(cadr false-value
))))
1152 (false-clauses (if false-case-p
1154 `((t ,false-value
))))
1155 (case-sym (if (and (dnet-methods-p true-value
)
1157 (eq (car false-value
) 'mcase
)
1158 (dnet-methods-p false-value
)))
1161 (type-sym `(,(cadr type
))))
1163 (,type-sym
,true-value
)
1165 `(if ,(let ((arg (dfun-arg-symbol position
)))
1167 (class `(class-test ,arg
,(cadr type
)))
1168 (class-eq `(class-eq-test ,arg
,(cadr type
)))))
1173 (defun class-from-type (type)
1174 (if (or (atom type
) (eq (car type
) t
))
1177 (and (dolist (type (cdr type
) *the-class-t
*)
1178 (when (and (consp type
) (not (eq (car type
) 'not
)))
1179 (return (class-from-type type
)))))
1181 (eql (class-of (cadr type
)))
1182 (class-eq (cadr type
))
1183 (class (cadr type
)))))
1185 ;;; We know that known-type implies neither new-type nor `(not ,new-type).
1186 (defun augment-type (new-type known-type
)
1187 (if (or (eq known-type t
)
1188 (eq (car new-type
) 'eql
))
1190 (let ((so-far (if (and (consp known-type
) (eq (car known-type
) 'and
))
1192 (list known-type
))))
1193 (unless (eq (car new-type
) 'not
)
1195 (mapcan (lambda (type)
1196 (unless (*subtypep new-type type
)
1201 `(and ,new-type
,@so-far
)))))
1203 (defun generate-discrimination-net-internal
1204 (gf methods types methods-function test-fun type-function
)
1205 (let* ((arg-info (gf-arg-info gf
))
1206 (precedence (arg-info-precedence arg-info
))
1207 (nreq (arg-info-number-required arg-info
))
1208 (metatypes (arg-info-metatypes arg-info
)))
1209 (labels ((do-column (p-tail contenders known-types
)
1211 (let* ((position (car p-tail
))
1212 (known-type (or (nth position types
) t
)))
1213 (if (eq (nth position metatypes
) t
)
1214 (do-column (cdr p-tail
) contenders
1215 (cons (cons position known-type
)
1217 (do-methods p-tail contenders
1218 known-type
() known-types
)))
1219 (funcall methods-function contenders
1220 (let ((k-t (make-list nreq
)))
1221 (dolist (index+type known-types
)
1222 (setf (nth (car index
+type
) k-t
)
1225 (do-methods (p-tail contenders known-type winners known-types
)
1227 ;; is a (sorted) list of methods that must be discriminated.
1229 ;; is the type of this argument, constructed from tests
1232 ;; is a (sorted) list of methods that are potentially
1233 ;; applicable after the discrimination has been made.
1234 (if (null contenders
)
1235 (do-column (cdr p-tail
)
1237 (cons (cons (car p-tail
) known-type
)
1239 (let* ((position (car p-tail
))
1240 (method (car contenders
))
1241 (specl (nth position
(method-specializers method
)))
1242 (type (funcall type-function
1243 (type-from-specializer specl
))))
1244 (multiple-value-bind (app-p maybe-app-p
)
1245 (specializer-applicable-using-type-p type known-type
)
1246 (flet ((determined-to-be (truth-value)
1247 (if truth-value app-p
(not maybe-app-p
)))
1248 (do-if (truth &optional implied
)
1249 (let ((ntype (if truth type
`(not ,type
))))
1254 (augment-type ntype known-type
))
1256 (append winners
`(,method
))
1259 (cond ((determined-to-be nil
) (do-if nil t
))
1260 ((determined-to-be t
) (do-if t t
))
1261 (t (funcall test-fun position type
1262 (do-if t
) (do-if nil
))))))))))
1263 (do-column precedence methods
()))))
1265 (defun compute-secondary-dispatch-function (generic-function net
&optional
1266 method-alist wrappers
)
1267 (function-funcall (compute-secondary-dispatch-function1 generic-function net
)
1268 method-alist wrappers
))
1270 (defvar *eq-case-table-limit
* 15)
1271 (defvar *case-table-limit
* 10)
1273 (defun compute-mcase-parameters (case-list)
1274 (unless (eq t
(caar (last case-list
)))
1275 (error "The key for the last case arg to mcase was not T"))
1276 (let* ((eq-p (dolist (case case-list t
)
1277 (unless (or (eq (car case
) t
)
1278 (symbolp (caar case
)))
1280 (len (1- (length case-list
)))
1281 (type (cond ((= len
1)
1285 *eq-case-table-limit
*
1286 *case-table-limit
*))
1292 (defmacro mlookup
(key info default
&optional eq-p type
)
1293 (unless (or (eq eq-p t
) (null eq-p
))
1294 (bug "Invalid eq-p argument: ~S" eq-p
))
1298 (declare (optimize (inhibit-warnings 3)))
1299 (,(if eq-p
'eq
'eql
) ,key
(car ,info
)))
1303 `(dolist (e ,info
,default
)
1305 (declare (optimize (inhibit-warnings 3)))
1306 (,(if eq-p
'eq
'eql
) (car e
) ,key
))
1309 `(gethash ,key
,info
,default
))))
1311 (defun net-test-converter (form)
1313 (default-test-converter form
)
1315 ((invoke-effective-method-function invoke-fast-method-call
1316 invoke-effective-narrow-method-function
)
1323 `(mlookup ,(cadr form
)
1326 ,@(compute-mcase-parameters (cddr form
))))
1327 (t (default-test-converter form
)))))
1329 (defun net-code-converter (form)
1331 (default-code-converter form
)
1333 ((methods unordered-methods
)
1334 (let ((gensym (gensym)))
1338 (let ((mp (compute-mcase-parameters (cddr form
)))
1339 (gensym (gensym)) (default (gensym)))
1340 (values `(mlookup ,(cadr form
) ,gensym
,default
,@mp
)
1341 (list gensym default
))))
1343 (default-code-converter form
)))))
1345 (defun net-constant-converter (form generic-function
)
1346 (or (let ((c (methods-converter form generic-function
)))
1349 (default-constant-converter form
)
1352 (let* ((mp (compute-mcase-parameters (cddr form
)))
1353 (list (mapcar (lambda (clause)
1354 (let ((key (car clause
))
1355 (meth (cadr clause
)))
1356 (cons (if (consp key
) (car key
) key
)
1358 meth generic-function
))))
1360 (default (car (last list
))))
1361 (list (list* :mcase mp
(nbutlast list
))
1364 (default-constant-converter form
))))))
1366 (defun methods-converter (form generic-function
)
1367 (cond ((and (consp form
) (eq (car form
) 'methods
))
1369 (get-effective-method-function1 generic-function
(cadr form
))))
1370 ((and (consp form
) (eq (car form
) 'unordered-methods
))
1371 (default-secondary-dispatch-function generic-function
))))
1373 (defun convert-methods (constant method-alist wrappers
)
1374 (if (and (consp constant
)
1375 (eq (car constant
) '.methods.
))
1376 (funcall (cdr constant
) method-alist wrappers
)
1379 (defun convert-table (constant method-alist wrappers
)
1380 (cond ((and (consp constant
)
1381 (eq (car constant
) :mcase
))
1382 (let ((alist (mapcar (lambda (k+m
)
1384 (convert-methods (cdr k
+m
)
1388 (mp (cadr constant
)))
1395 (let ((table (make-hash-table :test
(if (car mp
) 'eq
'eql
))))
1397 (setf (gethash (car k
+m
) table
) (cdr k
+m
)))
1400 (defun compute-secondary-dispatch-function1 (generic-function net
1401 &optional function-p
)
1403 ((and (eq (car net
) 'methods
) (not function-p
))
1404 (get-effective-method-function1 generic-function
(cadr net
)))
1406 (let* ((name (generic-function-name generic-function
))
1407 (arg-info (gf-arg-info generic-function
))
1408 (metatypes (arg-info-metatypes arg-info
))
1409 (nargs (length metatypes
))
1410 (applyp (arg-info-applyp arg-info
))
1411 (fmc-arg-info (cons nargs applyp
))
1412 (arglist (if function-p
1413 (make-dfun-lambda-list nargs applyp
)
1414 (make-fast-method-call-lambda-list nargs applyp
))))
1415 (multiple-value-bind (cfunction constants
)
1416 ;; We don't want NAMED-LAMBDA for any expressions handed to FNGEN,
1417 ;; because name mismatches will render the hashing ineffective.
1418 (get-fun1 `(lambda ,arglist
1419 (declare (optimize (sb-c::store-closure-debug-pointer
3)))
1420 ,@(unless function-p
1421 `((declare (ignore .pv. .next-method-call.
))))
1422 (locally (declare #.
*optimize-speed
*)
1424 ,(make-emf-call nargs applyp
'emf
))))
1425 #'net-test-converter
1426 #'net-code-converter
1428 (net-constant-converter form generic-function
)))
1429 (lambda (method-alist wrappers
)
1430 (let* ((alist (list nil
))
1432 (dolist (constant constants
)
1433 (let* ((a (or (dolist (a alist nil
)
1434 (when (eq (car a
) constant
)
1438 constant method-alist wrappers
)
1440 constant method-alist wrappers
)))))
1442 (setf (cdr alist-tail
) new
)
1443 (setf alist-tail new
)))
1444 (let ((function (apply cfunction
(mapcar #'cdr
(cdr alist
)))))
1446 (set-fun-name function
`(gf-dispatch ,name
))
1447 (make-fast-method-call
1448 :function
(set-fun-name function
`(sdfun-method ,name
))
1449 :arg-info fmc-arg-info
))))))))))
1451 (defvar *show-make-unordered-methods-emf-calls
* nil
)
1453 (defun make-unordered-methods-emf (generic-function methods
)
1454 (when *show-make-unordered-methods-emf-calls
*
1455 (format t
"~&make-unordered-methods-emf ~S~%"
1456 (generic-function-name generic-function
)))
1457 (lambda (&rest args
)
1458 (let* ((types (types-from-args generic-function args
'eql
))
1459 (smethods (sort-applicable-methods generic-function
1462 (emf (get-effective-method-function generic-function smethods
)))
1463 (invoke-emf emf args
))))
1465 ;;; The value returned by compute-discriminating-function is a function
1466 ;;; object. It is called a discriminating function because it is called
1467 ;;; when the generic function is called and its role is to discriminate
1468 ;;; on the arguments to the generic function and then call appropriate
1469 ;;; method functions.
1471 ;;; A discriminating function can only be called when it is installed as
1472 ;;; the funcallable instance function of the generic function for which
1473 ;;; it was computed.
1475 ;;; More precisely, if compute-discriminating-function is called with
1476 ;;; an argument <gf1>, and returns a result <df1>, that result must
1477 ;;; not be passed to apply or funcall directly. Rather, <df1> must be
1478 ;;; stored as the funcallable instance function of the same generic
1479 ;;; function <gf1> (using SET-FUNCALLABLE-INSTANCE-FUNCTION). Then the
1480 ;;; generic function can be passed to funcall or apply.
1482 ;;; An important exception is that methods on this generic function are
1483 ;;; permitted to return a function which itself ends up calling the value
1484 ;;; returned by a more specific method. This kind of `encapsulation' of
1485 ;;; discriminating function is critical to many uses of the MOP.
1487 ;;; As an example, the following canonical case is legal:
1489 ;;; (defmethod compute-discriminating-function ((gf my-generic-function))
1490 ;;; (let ((std (call-next-method)))
1492 ;;; (print (list 'call-to-gf gf arg))
1493 ;;; (funcall std arg))))
1495 ;;; Because many discriminating functions would like to use a dynamic
1496 ;;; strategy in which the precise discriminating function changes with
1497 ;;; time it is important to specify how a discriminating function is
1498 ;;; permitted itself to change the funcallable instance function of the
1499 ;;; generic function.
1501 ;;; Discriminating functions may set the funcallable instance function
1502 ;;; of the generic function, but the new value must be generated by making
1503 ;;; a call to COMPUTE-DISCRIMINATING-FUNCTION. This is to ensure that any
1504 ;;; more specific methods which may have encapsulated the discriminating
1505 ;;; function will get a chance to encapsulate the new, inner discriminating
1508 ;;; This implies that if a discriminating function wants to modify itself
1509 ;;; it should first store some information in the generic function proper,
1510 ;;; and then call compute-discriminating-function. The appropriate method
1511 ;;; on compute-discriminating-function will see the information stored in
1512 ;;; the generic function and generate a discriminating function accordingly.
1514 ;;; The following is an example of a discriminating function which modifies
1515 ;;; itself in accordance with this protocol:
1517 ;;; (defmethod compute-discriminating-function ((gf my-generic-function))
1519 ;;; (cond (<some condition>
1520 ;;; <store some info in the generic function>
1521 ;;; (set-funcallable-instance-function
1523 ;;; (compute-discriminating-function gf))
1524 ;;; (funcall gf arg))
1526 ;;; <call-a-method-of-gf>))))
1528 ;;; Whereas this code would not be legal:
1530 ;;; (defmethod compute-discriminating-function ((gf my-generic-function))
1532 ;;; (cond (<some condition>
1533 ;;; (set-funcallable-instance-function
1535 ;;; (lambda (a) ..))
1536 ;;; (funcall gf arg))
1538 ;;; <call-a-method-of-gf>))))
1540 ;;; NOTE: All the examples above assume that all instances of the class
1541 ;;; my-generic-function accept only one argument.
1543 (defun slot-value-using-class-dfun (class object slotd
)
1544 (declare (ignore class
))
1545 (funcall (slot-info-reader (slot-definition-info slotd
)) object
))
1547 (defun setf-slot-value-using-class-dfun (new-value class object slotd
)
1548 (declare (ignore class
))
1549 (funcall (slot-info-writer (slot-definition-info slotd
)) new-value object
))
1551 (defun slot-boundp-using-class-dfun (class object slotd
)
1552 (declare (ignore class
))
1553 (funcall (slot-info-boundp (slot-definition-info slotd
)) object
))
1555 (defun special-case-for-compute-discriminating-function-p (gf)
1556 (or (eq gf
#'slot-value-using-class
)
1557 (eq gf
#'(setf slot-value-using-class
))
1558 (eq gf
#'slot-boundp-using-class
)))
1560 ;;; this is the normal function for computing the discriminating
1561 ;;; function of a standard-generic-function
1562 (let (initial-print-object-cache)
1563 (defun standard-compute-discriminating-function (gf)
1564 (let ((dfun-state (slot-value gf
'dfun-state
)))
1565 (when (special-case-for-compute-discriminating-function-p gf
)
1566 ;; if we have a special case for
1567 ;; COMPUTE-DISCRIMINATING-FUNCTION, then (at least for the
1568 ;; special cases implemented as of 2006-05-09) any information
1569 ;; in the cache is misplaced.
1570 (aver (null dfun-state
)))
1571 (typecase dfun-state
1573 (when (eq gf
#'compute-applicable-methods
)
1574 (update-all-c-a-m-gf-info gf
))
1576 ((eq gf
#'slot-value-using-class
)
1577 (update-slot-value-gf-info gf
'reader
)
1578 #'slot-value-using-class-dfun
)
1579 ((eq gf
#'(setf slot-value-using-class
))
1580 (update-slot-value-gf-info gf
'writer
)
1581 #'setf-slot-value-using-class-dfun
)
1582 ((eq gf
#'slot-boundp-using-class
)
1583 (update-slot-value-gf-info gf
'boundp
)
1584 #'slot-boundp-using-class-dfun
)
1585 ;; KLUDGE: PRINT-OBJECT is not a special-case in the sense
1586 ;; of having a desperately special discriminating function.
1587 ;; However, it is important that the machinery for printing
1588 ;; conditions for stack and heap exhaustion, and the
1589 ;; restarts offered by the debugger, work without consuming
1590 ;; many extra resources. This way (testing by name of GF
1591 ;; rather than by identity) was the only way I found to get
1592 ;; this to bootstrap, given that the PRINT-OBJECT generic
1593 ;; function is only set up later, in
1594 ;; SRC;PCL;PRINT-OBJECT.LISP. -- CSR, 2008-06-09
1595 ((eq (slot-value gf
'name
) 'print-object
)
1596 (let ((nkeys (nth-value 3 (get-generic-fun-info gf
))))
1598 ;; KLUDGE: someone has defined a method
1599 ;; specialized on the second argument: punt.
1600 (setf initial-print-object-cache nil
)
1601 (make-initial-dfun gf
))
1602 (initial-print-object-cache
1603 (multiple-value-bind (dfun cache info
)
1604 (make-caching-dfun gf
(copy-cache initial-print-object-cache
))
1605 (set-dfun gf dfun cache info
)))
1606 ;; the relevant PRINT-OBJECT methods get defined
1607 ;; late, by delayed DEFMETHOD. We mustn't cache
1608 ;; the effective method for our classes earlier
1609 ;; than the relevant PRINT-OBJECT methods are
1611 ((boundp '*!delayed-defmethod-args
*)
1612 (make-initial-dfun gf
))
1613 (t (multiple-value-bind (dfun cache info
)
1614 (make-final-dfun-internal
1616 (mapcar (lambda (x) (list (find-class x
)))
1617 '(sb-kernel::control-stack-exhausted
1618 sb-kernel
::binding-stack-exhausted
1619 sb-kernel
::alien-stack-exhausted
1620 sb-kernel
::heap-exhausted-error
1622 (setq initial-print-object-cache cache
)
1623 (set-dfun gf dfun
(copy-cache cache
) info
))))))
1624 ((gf-precompute-dfun-and-emf-p (slot-value gf
'arg-info
))
1625 (make-final-dfun gf
))
1627 (make-initial-dfun gf
))))
1628 (function dfun-state
)
1629 (cons (car dfun-state
))))))
1631 ;;; in general we need to support SBCL's encapsulation for generic
1632 ;;; functions: the default implementation of encapsulation changes the
1633 ;;; identity of the function bound to a name, which breaks anything
1634 ;;; class-based, so we implement the encapsulation ourselves in the
1635 ;;; discriminating function.
1636 (defun sb-impl::encapsulate-generic-function
(gf type function
)
1637 (push (cons type function
) (generic-function-encapsulations gf
))
1638 (reinitialize-instance gf
))
1640 (defun sb-impl::unencapsulate-generic-function
(gf type
)
1641 (setf (generic-function-encapsulations gf
)
1642 (remove type
(generic-function-encapsulations gf
)
1643 :key
#'car
:count
1))
1644 (reinitialize-instance gf
))
1645 (defun sb-impl::encapsulated-generic-function-p
(gf type
)
1646 (position type
(generic-function-encapsulations gf
) :key
#'car
))
1647 (defun maybe-encapsulate-discriminating-function (gf encs std
)
1650 (let ((inner (maybe-encapsulate-discriminating-function
1652 (function (cdar encs
)))
1653 (lambda (&rest args
)
1654 (apply function inner args
)))))
1655 (defmethod compute-discriminating-function ((gf standard-generic-function
))
1656 (standard-compute-discriminating-function gf
))
1657 (defmethod compute-discriminating-function :around
((gf standard-generic-function
))
1658 (maybe-encapsulate-discriminating-function
1659 gf
(generic-function-encapsulations gf
) (call-next-method)))
1661 (defmethod (setf class-name
) (new-value class
)
1662 (let ((classoid (layout-classoid (class-wrapper class
))))
1663 (if (and new-value
(symbolp new-value
))
1664 (setf (classoid-name classoid
) new-value
)
1665 (setf (classoid-name classoid
) nil
)))
1666 (reinitialize-instance class
:name new-value
)
1669 (defmethod (setf generic-function-name
) (new-value generic-function
)
1670 (reinitialize-instance generic-function
:name new-value
)
1673 (defmethod function-keywords ((method standard-method
))
1674 (multiple-value-bind (llks nreq nopt keywords
)
1675 (analyze-lambda-list (if (consp method
)
1676 (early-method-lambda-list method
)
1677 (method-lambda-list method
)))
1678 (declare (ignore nreq nopt
))
1679 (values keywords
(ll-kwds-allowp llks
))))
1681 ;;; This is based on the rules of method lambda list congruency
1682 ;;; defined in the spec. The lambda list it constructs is the pretty
1683 ;;; union of the lambda lists of the generic function and of all its
1684 ;;; methods. It doesn't take method applicability into account; we
1685 ;;; also ignore non-public parts of the interface (e.g. &AUX, default
1686 ;;; and supplied-p parameters)
1687 ;;; The compiler uses this for type-checking that callers pass acceptable
1688 ;;; keywords, so don't make this do anything fancy like looking at effective
1689 ;;; methods without also fixing the compiler.
1690 (defmethod generic-function-pretty-arglist ((gf standard-generic-function
))
1691 (let ((gf-lambda-list (generic-function-lambda-list gf
))
1692 (methods (generic-function-methods gf
)))
1693 (flet ((canonize (k)
1694 (multiple-value-bind (kw var
)
1695 (parse-key-arg-spec k
)
1696 (if (and (eql (symbol-package kw
) *keyword-package
*)
1699 (list (list kw var
))))))
1700 (multiple-value-bind (llks required optional rest keys
)
1701 (parse-lambda-list gf-lambda-list
:silent t
)
1702 (collect ((keys (mapcar #'canonize keys
)))
1703 ;; Possibly extend the keyword parameters of the gf by
1704 ;; additional key parameters of its methods:
1706 (make-lambda-list llks nil required optional rest
(keys)))
1707 (binding* (((m.llks nil nil nil m.keys
)
1708 (parse-lambda-list (method-lambda-list m
) :silent t
)))
1709 (setq llks
(logior llks m.llks
))
1711 (unless (member (parse-key-arg-spec k
) (keys)
1712 :key
#'parse-key-arg-spec
:test
#'eq
)
1713 (keys (canonize k
)))))))))))