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 The CommonLoops evaluator is meta-circular.
30 Most of the code in PCL is methods on generic functions, including
31 most of the code that actually implements generic functions and method
34 So, we have a classic bootstrapping problem. The solution to this is
35 to first get a cheap implementation of generic functions running,
36 these are called early generic functions. These early generic
37 functions and the corresponding early methods and early method lookup
38 are used to get enough of the system running that it is possible to
39 create real generic functions and methods and implement real method
40 lookup. At that point (done in the file FIXUP) the function
41 !FIX-EARLY-GENERIC-FUNCTIONS is called to convert all the early generic
42 functions to real generic functions.
44 The cheap generic functions are built using the same
45 FUNCALLABLE-INSTANCE objects that real generic functions are made out of.
46 This means that as PCL is being bootstrapped, the cheap generic
47 function objects which are being created are the same objects which
48 will later be real generic functions. This is good because:
49 - we don't cons garbage structure, and
50 - we can keep pointers to the cheap generic function objects
51 during booting because those pointers will still point to
52 the right object after the generic functions are all fixed up.
54 This file defines the DEFMETHOD macro and the mechanism used to expand
55 it. This includes the mechanism for processing the body of a method.
56 DEFMETHOD basically expands into a call to LOAD-DEFMETHOD, which
57 basically calls ADD-METHOD to add the method to the generic function.
58 These expansions can be loaded either during bootstrapping or when PCL
59 is fully up and running.
61 An important effect of this arrangement is it means we can compile
62 files with DEFMETHOD forms in them in a completely running PCL, but
63 then load those files back in during bootstrapping. This makes
64 development easier. It also means there is only one set of code for
65 processing DEFMETHOD. Bootstrapping works by being sure to have
66 LOAD-METHOD be careful to call only primitives which work during
71 (declaim (notinline make-a-method add-named-method
72 ensure-generic-function-using-class
73 add-method remove-method))
75 (defvar *!early-functions*
76 '((make-a-method early-make-a-method real-make-a-method)
77 (add-named-method early-add-named-method real-add-named-method)))
79 ;;; For each of the early functions, arrange to have it point to its
80 ;;; early definition. Do this in a way that makes sure that if we
81 ;;; redefine one of the early definitions the redefinition will take
82 ;;; effect. This makes development easier.
83 (dolist (fns *!early-functions*)
84 (let ((name (car fns))
85 (early-name (cadr fns)))
86 (setf (gdefinition name)
89 (apply (fdefinition early-name) args))
92 ;;; *!GENERIC-FUNCTION-FIXUPS* is used by !FIX-EARLY-GENERIC-FUNCTIONS
93 ;;; to convert the few functions in the bootstrap which are supposed
94 ;;; to be generic functions but can't be early on.
96 ;;; each entry is a list of name and lambda-list, class names as
97 ;;; specializers, and method body function name.
98 (defvar *!generic-function-fixups*
100 ((generic-function method)
101 (standard-generic-function method)
104 ((generic-function method)
105 (standard-generic-function method)
108 ((generic-function qualifiers specializers &optional (errorp t))
109 (standard-generic-function t t)
111 (ensure-generic-function-using-class
112 ((generic-function fun-name
113 &key generic-function-class environment
116 real-ensure-gf-using-class--generic-function)
117 ((generic-function fun-name
118 &key generic-function-class environment
121 real-ensure-gf-using-class--null))
123 ((proto-generic-function proto-method lambda-expression environment)
124 (standard-generic-function standard-method t t)
125 real-make-method-lambda))
126 (make-method-specializers-form
127 ((proto-generic-function proto-method specializer-names environment)
128 (standard-generic-function standard-method t t)
129 real-make-method-specializers-form))
130 (parse-specializer-using-class
131 ((generic-function specializer)
132 (standard-generic-function t)
133 real-parse-specializer-using-class))
134 (unparse-specializer-using-class
135 ((generic-function specializer)
136 (standard-generic-function t)
137 real-unparse-specializer-using-class))
138 (make-method-initargs-form
139 ((proto-generic-function proto-method
141 lambda-list environment)
142 (standard-generic-function standard-method t t t)
143 real-make-method-initargs-form))
144 (compute-effective-method
145 ((generic-function combin applicable-methods)
146 (generic-function standard-method-combination t)
147 standard-compute-effective-method))))
149 (defmacro defgeneric (fun-name lambda-list &body options)
150 (declare (type list lambda-list))
151 (unless (legal-fun-name-p fun-name)
152 (error 'simple-program-error
153 :format-control "illegal generic function name ~S"
154 :format-arguments (list fun-name)))
155 (check-gf-lambda-list lambda-list)
158 (flet ((duplicate-option (name)
159 (error 'simple-program-error
160 :format-control "The option ~S appears more than once."
161 :format-arguments (list name)))
162 (expand-method-definition (qab) ; QAB = qualifiers, arglist, body
163 (let* ((arglist-pos (position-if #'listp qab))
164 (arglist (elt qab arglist-pos))
165 (qualifiers (subseq qab 0 arglist-pos))
166 (body (nthcdr (1+ arglist-pos) qab)))
167 `(push (defmethod ,fun-name ,@qualifiers ,arglist ,@body)
168 (generic-function-initial-methods (fdefinition ',fun-name))))))
169 (macrolet ((initarg (key) `(getf initargs ,key)))
170 (dolist (option options)
171 (let ((car-option (car option)))
174 (dolist (spec (cdr option))
176 (error 'simple-program-error
177 :format-control "~@<Invalid declaration specifier in ~
179 :format-arguments (list spec)))
180 (when (member (first spec)
181 ;; FIXME: this list is slightly weird.
182 ;; ANSI (on the DEFGENERIC page) in one
183 ;; place allows only OPTIMIZE; in
184 ;; another place gives this list of
185 ;; disallowed declaration specifiers.
186 ;; This seems to be the only place where
187 ;; the FUNCTION declaration is
188 ;; mentioned; TYPE seems to be missing.
189 ;; Very strange. -- CSR, 2002-10-21
190 '(declaration ftype function
191 inline notinline special))
192 (error 'simple-program-error
193 :format-control "The declaration specifier ~S ~
194 is not allowed inside DEFGENERIC."
195 :format-arguments (list spec)))
196 (if (or (eq 'optimize (first spec))
197 (info :declaration :recognized (first spec)))
198 (push spec (initarg :declarations))
199 (warn "Ignoring unrecognized declaration in DEFGENERIC: ~S"
202 (when (initarg car-option)
203 (duplicate-option car-option))
204 (unless (symbolp (cadr option))
205 (error 'simple-program-error
206 :format-control "METHOD-COMBINATION name not a ~
208 :format-arguments (list (cadr option))))
209 (setf (initarg car-option)
211 (:argument-precedence-order
212 (let* ((required (parse-lambda-list lambda-list))
213 (supplied (cdr option)))
214 (unless (= (length required) (length supplied))
215 (error 'simple-program-error
216 :format-control "argument count discrepancy in ~
217 :ARGUMENT-PRECEDENCE-ORDER clause."
218 :format-arguments nil))
219 (when (set-difference required supplied)
220 (error 'simple-program-error
221 :format-control "unequal sets for ~
222 :ARGUMENT-PRECEDENCE-ORDER clause: ~
224 :format-arguments (list required supplied)))
225 (setf (initarg car-option)
227 ((:documentation :generic-function-class :method-class)
228 (unless (proper-list-of-length-p option 2)
229 (error "bad list length for ~S" option))
230 (if (initarg car-option)
231 (duplicate-option car-option)
232 (setf (initarg car-option) `',(cadr option))))
234 (push (cdr option) methods))
236 ;; ANSI requires that unsupported things must get a
238 (error 'simple-program-error
239 :format-control "unsupported option ~S"
240 :format-arguments (list option))))))
242 (when (initarg :declarations)
243 (setf (initarg :declarations)
244 `',(initarg :declarations))))
246 (eval-when (:compile-toplevel :load-toplevel :execute)
247 (compile-or-load-defgeneric ',fun-name))
248 (load-defgeneric ',fun-name ',lambda-list
249 (sb-c:source-location) ,@initargs)
250 ,@(mapcar #'expand-method-definition methods)
251 (fdefinition ',fun-name)))))
253 (defun compile-or-load-defgeneric (fun-name)
254 (proclaim-as-fun-name fun-name)
255 (note-name-defined fun-name :function)
256 (unless (eq (info :function :where-from fun-name) :declared)
257 (setf (info :function :where-from fun-name) :defined)
258 (setf (info :function :type fun-name)
259 (specifier-type 'function))))
261 (defun load-defgeneric (fun-name lambda-list source-location &rest initargs)
262 (when (fboundp fun-name)
263 (warn 'sb-kernel:redefinition-with-defgeneric
265 :new-location source-location)
266 (let ((fun (fdefinition fun-name)))
267 (when (generic-function-p fun)
268 (loop for method in (generic-function-initial-methods fun)
269 do (remove-method fun method))
270 (setf (generic-function-initial-methods fun) '()))))
271 (apply #'ensure-generic-function
273 :lambda-list lambda-list
274 :definition-source source-location
277 (define-condition generic-function-lambda-list-error
278 (reference-condition simple-program-error)
280 (:default-initargs :references (list '(:ansi-cl :section (3 4 2)))))
282 (defun check-gf-lambda-list (lambda-list)
283 (flet ((ensure (arg ok)
285 (error 'generic-function-lambda-list-error
287 "~@<invalid ~S ~_in the generic function lambda list ~S~:>"
288 :format-arguments (list arg lambda-list)))))
289 (multiple-value-bind (required optional restp rest keyp keys allowp
290 auxp aux morep more-context more-count)
291 (parse-lambda-list lambda-list)
292 (declare (ignore required)) ; since they're no different in a gf ll
293 (declare (ignore restp rest)) ; since they're no different in a gf ll
294 (declare (ignore allowp)) ; since &ALLOW-OTHER-KEYS is fine either way
295 (declare (ignore aux)) ; since we require AUXP=NIL
296 (declare (ignore more-context more-count)) ; safely ignored unless MOREP
297 ;; no defaults allowed for &OPTIONAL arguments
299 (ensure i (or (symbolp i)
300 (and (consp i) (symbolp (car i)) (null (cdr i))))))
301 ;; no defaults allowed for &KEY arguments
304 (ensure i (or (symbolp i)
306 (or (symbolp (car i))
314 (error "&AUX is not allowed in a generic function lambda list: ~S"
316 ;; Oh, *puhlease*... not specifically as per section 3.4.2 of
317 ;; the ANSI spec, but the CMU CL &MORE extension does not
319 (aver (not morep)))))
321 (defmacro defmethod (name &rest args)
322 (multiple-value-bind (qualifiers lambda-list body)
323 (parse-defmethod args)
325 ;; KLUDGE: this double expansion is quite a monumental
326 ;; workaround: it comes about because of a fantastic interaction
327 ;; between the processing rules of CLHS 3.2.3.1 and the
328 ;; bizarreness of MAKE-METHOD-LAMBDA.
330 ;; MAKE-METHOD-LAMBDA can be called by the user, and if the
331 ;; lambda itself doesn't refer to outside bindings the return
332 ;; value must be compileable in the null lexical environment.
333 ;; However, the function must also refer somehow to the
334 ;; associated method object, so that it can call NO-NEXT-METHOD
335 ;; with the appropriate arguments if there is no next method --
336 ;; but when the function is generated, the method object doesn't
339 ;; In order to resolve this issue, we insert a literal cons cell
340 ;; into the body of the method lambda, return the same cons cell
341 ;; as part of the second (initargs) return value of
342 ;; MAKE-METHOD-LAMBDA, and a method on INITIALIZE-INSTANCE fills
343 ;; in the cell when the method is created. However, this
344 ;; strategy depends on having a fresh cons cell for every method
345 ;; lambda, which (without the workaround below) is skewered by
346 ;; the processing in CLHS 3.2.3.1, which permits implementations
347 ;; to macroexpand the bodies of EVAL-WHEN forms with both
348 ;; :COMPILE-TOPLEVEL and :LOAD-TOPLEVEL only once. The
349 ;; expansion below forces the double expansion in those cases,
350 ;; while expanding only once in the common case.
351 (eval-when (:load-toplevel)
352 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body))
353 (eval-when (:execute)
354 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body)))))
356 (defmacro %defmethod-expander
357 (name qualifiers lambda-list body &environment env)
358 (multiple-value-bind (proto-gf proto-method)
359 (prototypes-for-make-method-lambda name)
360 (expand-defmethod name proto-gf proto-method qualifiers
361 lambda-list body env)))
364 (defun prototypes-for-make-method-lambda (name)
365 (if (not (eq **boot-state** 'complete))
367 (let ((gf? (and (fboundp name)
368 (gdefinition name))))
370 (not (generic-function-p gf?)))
371 (values (class-prototype (find-class 'standard-generic-function))
372 (class-prototype (find-class 'standard-method)))
374 (class-prototype (or (generic-function-method-class gf?)
375 (find-class 'standard-method))))))))
377 ;;; Take a name which is either a generic function name or a list specifying
378 ;;; a SETF generic function (like: (SETF <generic-function-name>)). Return
379 ;;; the prototype instance of the method-class for that generic function.
381 ;;; If there is no generic function by that name, this returns the
382 ;;; default value, the prototype instance of the class
383 ;;; STANDARD-METHOD. This default value is also returned if the spec
384 ;;; names an ordinary function or even a macro. In effect, this leaves
385 ;;; the signalling of the appropriate error until load time.
387 ;;; Note: During bootstrapping, this function is allowed to return NIL.
388 (defun method-prototype-for-gf (name)
389 (let ((gf? (and (fboundp name)
390 (gdefinition name))))
391 (cond ((neq **boot-state** 'complete) nil)
393 (not (generic-function-p gf?))) ; Someone else MIGHT
394 ; error at load time.
395 (class-prototype (find-class 'standard-method)))
397 (class-prototype (or (generic-function-method-class gf?)
398 (find-class 'standard-method)))))))
400 ;;; These are used to communicate the method name and lambda-list to
401 ;;; MAKE-METHOD-LAMBDA-INTERNAL.
402 (defvar *method-name* nil)
403 (defvar *method-lambda-list* nil)
405 (defun expand-defmethod (name
412 (multiple-value-bind (parameters unspecialized-lambda-list specializers)
413 (parse-specialized-lambda-list lambda-list)
414 (declare (ignore parameters))
415 (let ((method-lambda `(lambda ,unspecialized-lambda-list ,@body))
416 (*method-name* `(,name ,@qualifiers ,specializers))
417 (*method-lambda-list* lambda-list))
418 (multiple-value-bind (method-function-lambda initargs)
419 (make-method-lambda proto-gf proto-method method-lambda env)
420 (let ((initargs-form (make-method-initargs-form
421 proto-gf proto-method method-function-lambda
423 (specializers-form (make-method-specializers-form
424 proto-gf proto-method specializers env)))
426 ;; Note: We could DECLAIM the ftype of the generic function
427 ;; here, since ANSI specifies that we create it if it does
428 ;; not exist. However, I chose not to, because I think it's
429 ;; more useful to support a style of programming where every
430 ;; generic function has an explicit DEFGENERIC and any typos
431 ;; in DEFMETHODs are warned about. Otherwise
433 ;; (DEFGENERIC FOO-BAR-BLETCH (X))
434 ;; (DEFMETHOD FOO-BAR-BLETCH ((X HASH-TABLE)) ..)
435 ;; (DEFMETHOD FOO-BRA-BLETCH ((X SIMPLE-VECTOR)) ..)
436 ;; (DEFMETHOD FOO-BAR-BLETCH ((X VECTOR)) ..)
437 ;; (DEFMETHOD FOO-BAR-BLETCH ((X ARRAY)) ..)
438 ;; (DEFMETHOD FOO-BAR-BLETCH ((X LIST)) ..)
440 ;; compiles without raising an error and runs without
441 ;; raising an error (since SIMPLE-VECTOR cases fall through
442 ;; to VECTOR) but still doesn't do what was intended. I hate
443 ;; that kind of bug (code which silently gives the wrong
444 ;; answer), so we don't do a DECLAIM here. -- WHN 20000229
445 ,(make-defmethod-form name qualifiers specializers-form
446 unspecialized-lambda-list
448 (class-name (class-of proto-method))
452 (defun interned-symbol-p (x)
453 (and (symbolp x) (symbol-package x)))
455 (defun make-defmethod-form
456 (name qualifiers specializers unspecialized-lambda-list
457 method-class-name initargs-form)
460 (if (and (interned-symbol-p (fun-name-block-name name))
461 (every #'interned-symbol-p qualifiers)
464 (and (eq (car s) 'eql)
466 (let ((sv (constant-form-value (cadr s))))
467 (or (interned-symbol-p sv)
470 (standard-char-p sv)))))
471 (interned-symbol-p s)))
473 (consp initargs-form)
474 (eq (car initargs-form) 'list*)
475 (memq (cadr initargs-form) '(:function))
476 (consp (setq fn (caddr initargs-form)))
477 (eq (car fn) 'function)
478 (consp (setq fn-lambda (cadr fn)))
479 (eq (car fn-lambda) 'lambda)
480 (bug "Really got here"))
481 (let* ((specls (mapcar (lambda (specl)
483 ;; CONSTANT-FORM-VALUE? What I
484 ;; kind of want to know, though,
485 ;; is what happens if we don't do
486 ;; this for some slow-method
487 ;; function because of a hairy
488 ;; lexenv -- is the only bad
489 ;; effect that the method
490 ;; function ends up unnamed? If
491 ;; so, couldn't we arrange to
493 `(,(car specl) ,(eval (cadr specl)))
496 (mname `(,(if (eq (cadr initargs-form) :function)
497 'slow-method 'fast-method)
498 ,name ,@qualifiers ,specls)))
500 (defun ,mname ,(cadr fn-lambda)
502 ,(make-defmethod-form-internal
503 name qualifiers `',specls
504 unspecialized-lambda-list method-class-name
505 `(list* ,(cadr initargs-form)
507 ,@(cdddr initargs-form)))))
508 (make-defmethod-form-internal
512 `(list ,@(mapcar (lambda (specializer)
513 (if (consp specializer)
514 ``(,',(car specializer)
515 ,,(cadr specializer))
518 unspecialized-lambda-list
522 (defun make-defmethod-form-internal
523 (name qualifiers specializers-form unspecialized-lambda-list
524 method-class-name initargs-form)
530 ',unspecialized-lambda-list
532 (sb-c:source-location)))
534 (defmacro make-method-function (method-lambda &environment env)
535 (multiple-value-bind (proto-gf proto-method)
536 (prototypes-for-make-method-lambda nil)
537 (multiple-value-bind (method-function-lambda initargs)
538 (make-method-lambda proto-gf proto-method method-lambda env)
539 (make-method-initargs-form proto-gf
541 method-function-lambda
545 (defun real-make-method-initargs-form (proto-gf proto-method
546 method-lambda initargs env)
547 (declare (ignore proto-gf proto-method))
548 (unless (and (consp method-lambda)
549 (eq (car method-lambda) 'lambda))
550 (error "The METHOD-LAMBDA argument to MAKE-METHOD-FUNCTION, ~S, ~
551 is not a lambda form."
553 (make-method-initargs-form-internal method-lambda initargs env))
555 (unless (fboundp 'make-method-initargs-form)
556 (setf (gdefinition 'make-method-initargs-form)
557 (symbol-function 'real-make-method-initargs-form)))
559 ;;; When bootstrapping PCL MAKE-METHOD-LAMBDA starts out as a regular
560 ;;; functions: REAL-MAKE-METHOD-LAMBDA set to the fdefinition of
561 ;;; MAKE-METHOD-LAMBDA. Once generic functions are born, the
562 ;;; REAL-MAKE-METHOD lambda is used as the body of the default method.
563 ;;; MAKE-METHOD-LAMBDA-INTERNAL is split out into a separate function
564 ;;; so that changing it in a live image is easy, and changes actually
566 (defun real-make-method-lambda (proto-gf proto-method method-lambda env)
567 (make-method-lambda-internal proto-gf proto-method method-lambda env))
569 (unless (fboundp 'make-method-lambda)
570 (setf (gdefinition 'make-method-lambda)
571 (symbol-function 'real-make-method-lambda)))
573 (defun declared-specials (declarations)
574 (loop for (declare . specifiers) in declarations
575 append (loop for specifier in specifiers
576 when (eq 'special (car specifier))
577 append (cdr specifier))))
579 (defun make-method-lambda-internal (proto-gf proto-method method-lambda env)
580 (declare (ignore proto-gf proto-method))
581 (unless (and (consp method-lambda) (eq (car method-lambda) 'lambda))
582 (error "The METHOD-LAMBDA argument to MAKE-METHOD-LAMBDA, ~S, ~
583 is not a lambda form."
585 (multiple-value-bind (real-body declarations documentation)
586 (parse-body (cddr method-lambda))
587 ;; We have the %METHOD-NAME declaration in the place where we expect it only
588 ;; if there is are no non-standard prior MAKE-METHOD-LAMBDA methods -- or
589 ;; unless they're fantastically unintrusive.
590 (let* ((method-name *method-name*)
591 (method-lambda-list *method-lambda-list*)
592 ;; Macroexpansion caused by code-walking may call make-method-lambda and
593 ;; end up with wrong values
595 (*method-lambda-list* nil)
596 (generic-function-name (when method-name (car method-name)))
597 (specialized-lambda-list (or method-lambda-list
598 (ecase (car method-lambda)
599 (lambda (second method-lambda))
600 (named-lambda (third method-lambda)))))
601 ;; the method-cell is a way of communicating what method a
602 ;; method-function implements, for the purpose of
603 ;; NO-NEXT-METHOD. We need something that can be shared
604 ;; between function and initargs, but not something that
605 ;; will be coalesced as a constant (because we are naughty,
606 ;; oh yes) with the expansion of any other methods in the
607 ;; same file. -- CSR, 2007-05-30
608 (method-cell (list (make-symbol "METHOD-CELL"))))
609 (multiple-value-bind (parameters lambda-list specializers)
610 (parse-specialized-lambda-list specialized-lambda-list)
611 (let* ((required-parameters
612 (mapcar (lambda (r s) (declare (ignore s)) r)
615 (slots (mapcar #'list required-parameters))
618 ;; These declarations seem to be used by PCL to pass
619 ;; information to itself; when I tried to delete 'em
620 ;; ca. 0.6.10 it didn't work. I'm not sure how
621 ;; they work, but note the (VAR-DECLARATION '%CLASS ..)
622 ;; expression in CAN-OPTIMIZE-ACCESS1. -- WHN 2000-12-30
624 (mapcar (lambda (a s) (and (symbolp s)
629 ;; These TYPE declarations weren't in the original
630 ;; PCL code, but the Python compiler likes them a
631 ;; lot. (We're telling the compiler about our
632 ;; knowledge of specialized argument types so that
633 ;; it can avoid run-time type dispatch overhead,
634 ;; which can be a huge win for Python.)
636 ;; KLUDGE: when I tried moving these to
637 ;; ADD-METHOD-DECLARATIONS, things broke. No idea
638 ;; why. -- CSR, 2004-06-16
639 ,@(let ((specials (declared-specials declarations)))
640 (mapcar (lambda (par spec)
641 (parameter-specializer-declaration-in-defmethod
642 par spec specials env))
646 ;; Remove the documentation string and insert the
647 ;; appropriate class declarations. The documentation
648 ;; string is removed to make it easy for us to insert
649 ;; new declarations later, they will just go after the
650 ;; CADR of the method lambda. The class declarations
651 ;; are inserted to communicate the class of the method's
652 ;; arguments to the code walk.
653 `(lambda ,lambda-list
654 ;; The default ignorability of method parameters
655 ;; doesn't seem to be specified by ANSI. PCL had
656 ;; them basically ignorable but was a little
657 ;; inconsistent. E.g. even though the two
658 ;; method definitions
659 ;; (DEFMETHOD FOO ((X T) (Y T)) "Z")
660 ;; (DEFMETHOD FOO ((X T) Y) "Z")
661 ;; are otherwise equivalent, PCL treated Y as
662 ;; ignorable in the first definition but not in the
663 ;; second definition. We make all required
664 ;; parameters ignorable as a way of systematizing
665 ;; the old PCL behavior. -- WHN 2000-11-24
666 (declare (ignorable ,@required-parameters))
669 (block ,(fun-name-block-name generic-function-name)
671 (constant-value-p (and (null (cdr real-body))
672 (constantp (car real-body))))
673 (constant-value (and constant-value-p
674 (constant-form-value (car real-body))))
675 (plist (and constant-value-p
676 (or (typep constant-value
677 '(or number character))
678 (and (symbolp constant-value)
679 (symbol-package constant-value)))
680 (list :constant-value constant-value)))
681 (applyp (dolist (p lambda-list nil)
682 (cond ((memq p '(&optional &rest &key))
687 (walked-lambda call-next-method-p closurep
688 next-method-p-p setq-p
690 (walk-method-lambda method-lambda
694 (multiple-value-bind (walked-lambda-body
696 walked-documentation)
697 (parse-body (cddr walked-lambda))
698 (declare (ignore walked-documentation))
699 (when (some #'cdr slots)
700 (let ((slot-name-lists (slot-name-lists-from-slots slots)))
702 `(,@(when slot-name-lists
703 `(:slot-name-lists ,slot-name-lists))
705 (setq walked-lambda-body
706 `((pv-binding (,required-parameters
710 :slot-name-lists ',slot-name-lists)))
711 ,@walked-lambda-body)))))
712 (when (and (memq '&key lambda-list)
713 (not (memq '&allow-other-keys lambda-list)))
714 (let ((aux (memq '&aux lambda-list)))
715 (setq lambda-list (nconc (ldiff lambda-list aux)
716 (list '&allow-other-keys)
718 (values `(lambda (.method-args. .next-methods.)
719 (simple-lexical-method-functions
720 (,lambda-list .method-args. .next-methods.
722 ,(when call-next-method-p t)
723 :next-method-p-p ,next-method-p-p
725 :parameters-setqd ,parameters-setqd
726 :method-cell ,method-cell
729 ,@walked-declarations
731 (declare (disable-package-locks
732 %parameter-binding-modified))
733 (symbol-macrolet ((%parameter-binding-modified
734 ',@parameters-setqd))
735 (declare (enable-package-locks
736 %parameter-binding-modified))
737 ,@walked-lambda-body))))
738 `(,@(when call-next-method-p `(method-cell ,method-cell))
739 ,@(when (member call-next-method-p '(:simple nil))
740 '(simple-next-method-call t))
741 ,@(when plist `(plist ,plist))
742 ,@(when documentation `(:documentation ,documentation)))))))))))
744 (defun real-make-method-specializers-form
745 (proto-gf proto-method specializer-names env)
746 (declare (ignore env proto-gf proto-method))
749 ((and (eq **boot-state** 'complete)
752 ((symbolp name) `(find-class ',name))
753 ((consp name) (ecase (car name)
754 ((eql) `(intern-eql-specializer ,(cadr name)))
755 ((class-eq) `(class-eq-specializer (find-class ',(cadr name))))))
757 ;; FIXME: Document CLASS-EQ specializers.
758 (error 'simple-reference-error
760 "~@<~S is not a valid parameter specializer name.~@:>"
761 :format-arguments (list name)
762 :references (list '(:ansi-cl :macro defmethod)
763 '(:ansi-cl :glossary "parameter specializer name")))))))
764 `(list ,@(mapcar #'parse specializer-names))))
766 (unless (fboundp 'make-method-specializers-form)
767 (setf (gdefinition 'make-method-specializers-form)
768 (symbol-function 'real-make-method-specializers-form)))
770 (defun real-parse-specializer-using-class (generic-function specializer)
771 (let ((result (specializer-from-type specializer)))
772 (if (specializerp result)
774 (error "~@<~S cannot be parsed as a specializer for ~S.~@:>"
775 specializer generic-function))))
777 (unless (fboundp 'parse-specializer-using-class)
778 (setf (gdefinition 'parse-specializer-using-class)
779 (symbol-function 'real-parse-specializer-using-class)))
781 (defun real-unparse-specializer-using-class (generic-function specializer)
782 (if (specializerp specializer)
783 ;; FIXME: this HANDLER-CASE is a bit of a hammer to crack a nut:
784 ;; the idea is that we want to unparse permissively, so that the
785 ;; lazy (or rather the "portable") specializer extender (who
786 ;; does not define methods on these new SBCL-specific MOP
787 ;; functions) can still subclass specializer and define methods
788 ;; without everything going wrong. Making it cleaner and
789 ;; clearer that that is what we are defending against would be
790 ;; nice. -- CSR, 2007-06-01
792 (let ((type (specializer-type specializer)))
793 (if (and (consp type) (eq (car type) 'class))
794 (let* ((class (cadr type))
795 (class-name (class-name class)))
796 (if (eq class (find-class class-name nil))
800 (error () specializer))
801 (error "~@<~S is not a legal specializer for ~S.~@:>"
802 specializer generic-function)))
804 (unless (fboundp 'unparse-specializer-using-class)
805 (setf (gdefinition 'unparse-specializer-using-class)
806 (symbol-function 'real-unparse-specializer-using-class)))
808 ;;; a helper function for creating Python-friendly type declarations
809 ;;; in DEFMETHOD forms.
811 ;;; We're too lazy to cons up a new environment for this, so we just pass in
812 ;;; the list of locally declared specials in addition to the old environment.
813 (defun parameter-specializer-declaration-in-defmethod
814 (parameter specializer specials env)
815 (cond ((and (consp specializer)
816 (eq (car specializer) 'eql))
817 ;; KLUDGE: ANSI, in its wisdom, says that
818 ;; EQL-SPECIALIZER-FORMs in EQL specializers are evaluated at
819 ;; DEFMETHOD expansion time. Thus, although one might think
821 ;; (DEFMETHOD FOO ((X PACKAGE)
824 ;; the PACKAGE and (EQL 12) forms are both parallel type
825 ;; names, they're not, as is made clear when you do
826 ;; (DEFMETHOD FOO ((X PACKAGE)
829 ;; where Y needs to be a symbol named "BAR", not some cons
830 ;; made by (CONS 'QUOTE 'BAR). I.e. when the
831 ;; EQL-SPECIALIZER-FORM is (EQL 'X), it requires an argument
832 ;; to be of type (EQL X). It'd be easy to transform one to
833 ;; the other, but it'd be somewhat messier to do so while
834 ;; ensuring that the EQL-SPECIALIZER-FORM is only EVAL'd
835 ;; once. (The new code wouldn't be messy, but it'd require a
836 ;; big transformation of the old code.) So instead we punt.
840 ;; KLUDGE: For some low-level implementation
841 ;; classes, perhaps because of some problems related
842 ;; to the incomplete integration of PCL into SBCL's
843 ;; type system, some specializer classes can't be
844 ;; declared as argument types. E.g.
845 ;; (DEFMETHOD FOO ((X SLOT-OBJECT))
846 ;; (DECLARE (TYPE SLOT-OBJECT X))
849 ;; (DEFSTRUCT BAR A B)
851 ;; perhaps because of the way that STRUCTURE-OBJECT
852 ;; inherits both from SLOT-OBJECT and from
853 ;; SB-KERNEL:INSTANCE. In an effort to sweep such
854 ;; problems under the rug, we exclude these problem
855 ;; cases by blacklisting them here. -- WHN 2001-01-19
856 (list 'slot-object #+nil (find-class 'slot-object)))
858 ((not (eq **boot-state** 'complete))
859 ;; KLUDGE: PCL, in its wisdom, sometimes calls methods with
860 ;; types which don't match their specializers. (Specifically,
861 ;; it calls ENSURE-CLASS-USING-CLASS (T NULL) with a non-NULL
862 ;; second argument.) Hopefully it only does this kind of
863 ;; weirdness when bootstrapping.. -- WHN 20000610
865 ((typep specializer 'eql-specializer)
866 `(type (eql ,(eql-specializer-object specializer)) ,parameter))
867 ((or (var-special-p parameter env) (member parameter specials))
868 ;; Don't declare types for special variables -- our rebinding magic
869 ;; for SETQ cases don't work right there as SET, (SETF SYMBOL-VALUE),
870 ;; etc. make things undecidable.
873 ;; Otherwise, we can usually make Python very happy.
875 ;; KLUDGE: Since INFO doesn't work right for class objects here,
876 ;; and they are valid specializers, see if the specializer is
877 ;; a named class, and use the name in that case -- otherwise
878 ;; the class instance is ok, since info will just return NIL, NIL.
880 ;; We still need to deal with the class case too, but at
881 ;; least #.(find-class 'integer) and integer as equivalent
882 ;; specializers with this.
883 (let* ((specializer-nameoid
884 (if (and (typep specializer 'class)
885 (let ((name (class-name specializer)))
886 (and name (symbolp name)
887 (eq specializer (find-class name nil)))))
888 (class-name specializer)
890 (kind (info :type :kind specializer-nameoid)))
892 (flet ((specializer-nameoid-class ()
893 (typecase specializer-nameoid
894 (symbol (find-class specializer-nameoid nil))
895 (class specializer-nameoid)
896 (class-eq-specializer
897 (specializer-class specializer-nameoid))
900 ((:primitive) `(type ,specializer-nameoid ,parameter))
902 (let ((class (specializer-nameoid-class)))
903 ;; CLASS can be null here if the user has
904 ;; erroneously tried to use a defined type as a
905 ;; specializer; it can be a non-BUILT-IN-CLASS if
906 ;; the user defines a type and calls (SETF
907 ;; FIND-CLASS) in a consistent way.
908 (when (and class (typep class 'built-in-class))
909 `(type ,(class-name class) ,parameter))))
911 (let ((class (specializer-nameoid-class)))
914 (if (typep class '(or built-in-class structure-class))
915 `(type ,class ,parameter)
916 ;; don't declare CLOS classes as parameters;
917 ;; it's too expensive.
920 ;; we can get here, and still not have a failure
921 ;; case, by doing MOP programming like (PROGN
922 ;; (ENSURE-CLASS 'FOO) (DEFMETHOD BAR ((X FOO))
923 ;; ...)). Best to let the user know we haven't
924 ;; been able to extract enough information:
926 "~@<can't find type for specializer ~S in ~S.~@:>"
928 'parameter-specializer-declaration-in-defmethod)
930 ((:forthcoming-defclass-type)
933 ;;; For passing a list (groveled by the walker) of the required
934 ;;; parameters whose bindings are modified in the method body to the
935 ;;; optimized-slot-value* macros.
936 (define-symbol-macro %parameter-binding-modified ())
938 (defmacro simple-lexical-method-functions ((lambda-list
944 ,method-args ,next-methods
945 (bind-simple-lexical-method-functions (,method-args ,next-methods
947 (bind-args (,lambda-list ,method-args)
950 (defmacro fast-lexical-method-functions ((lambda-list
956 `(bind-fast-lexical-method-functions (,args ,rest-arg ,next-method-call ,lmf-options)
957 (bind-args (,(nthcdr (length args) lambda-list) ,rest-arg)
960 (defmacro bind-simple-lexical-method-functions
961 ((method-args next-methods (&key call-next-method-p next-method-p-p setq-p
962 parameters-setqd closurep applyp method-cell))
965 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
968 `(let ((.next-method. (car ,next-methods))
969 (,next-methods (cdr ,next-methods)))
970 (declare (ignorable .next-method. ,next-methods))
971 (flet (,@(and call-next-method-p
972 `((call-next-method (&rest cnm-args)
973 (declare (dynamic-extent cnm-args))
974 ,@(if (safe-code-p env)
975 `((%check-cnm-args cnm-args
980 (funcall (if (std-instance-p .next-method.)
981 (method-function .next-method.)
982 .next-method.) ; for early methods
983 (or cnm-args ,method-args)
985 (apply #'call-no-next-method
987 (or cnm-args ,method-args))))))
988 ,@(and next-method-p-p
990 (not (null .next-method.))))))
993 (defun call-no-next-method (method-cell &rest args)
994 (let ((method (car method-cell)))
996 ;; Can't easily provide a RETRY restart here, as the return value here is
997 ;; for the method, not the generic function.
998 (apply #'no-next-method (method-generic-function method)
1001 (defun call-no-applicable-method (gf args)
1003 (apply #'no-applicable-method gf args)
1005 :report "Retry calling the generic function."
1008 (defun call-no-primary-method (gf args)
1010 (apply #'no-primary-method gf args)
1012 :report "Retry calling the generic function."
1015 (defstruct (method-call (:copier nil))
1016 (function #'identity :type function)
1018 (defstruct (constant-method-call (:copier nil) (:include method-call))
1021 #-sb-fluid (declaim (sb-ext:freeze-type method-call))
1023 (defmacro invoke-method-call1 (function args cm-args)
1024 `(let ((.function. ,function)
1026 (.cm-args. ,cm-args))
1027 (if (and .cm-args. (null (cdr .cm-args.)))
1028 (funcall .function. .args. (car .cm-args.))
1029 (apply .function. .args. .cm-args.))))
1031 (defmacro invoke-method-call (method-call restp &rest required-args+rest-arg)
1032 `(invoke-method-call1 (method-call-function ,method-call)
1034 `(list* ,@required-args+rest-arg)
1035 `(list ,@required-args+rest-arg))
1036 (method-call-call-method-args ,method-call)))
1038 (defstruct (fast-method-call (:copier nil))
1039 (function #'identity :type function)
1043 (defstruct (constant-fast-method-call
1044 (:copier nil) (:include fast-method-call))
1047 #-sb-fluid (declaim (sb-ext:freeze-type fast-method-call))
1049 ;; The two variants of INVOKE-FAST-METHOD-CALL differ in how REST-ARGs
1050 ;; are handled. The first one will get REST-ARG as a single list (as
1051 ;; the last argument), and will thus need to use APPLY. The second one
1052 ;; will get them as a &MORE argument, so we can pass the arguments
1053 ;; directly with MULTIPLE-VALUE-CALL and %MORE-ARG-VALUES.
1055 (defmacro invoke-fast-method-call (method-call restp &rest required-args+rest-arg)
1056 `(,(if restp 'apply 'funcall) (fast-method-call-function ,method-call)
1057 (fast-method-call-pv ,method-call)
1058 (fast-method-call-next-method-call ,method-call)
1059 ,@required-args+rest-arg))
1061 (defmacro invoke-fast-method-call/more (method-call
1064 &rest required-args)
1065 (macrolet ((generate-call (n)
1066 ``(funcall (fast-method-call-function ,method-call)
1067 (fast-method-call-pv ,method-call)
1068 (fast-method-call-next-method-call ,method-call)
1070 ,@(loop for x below ,n
1071 collect `(sb-c::%more-arg ,more-context ,x)))))
1072 ;; The cases with only small amounts of required arguments passed
1073 ;; are probably very common, and special-casing speeds them up by
1074 ;; a factor of 2 with very little effect on the other
1075 ;; cases. Though it'd be nice to have the generic case be equally
1078 (0 ,(generate-call 0))
1079 (1 ,(generate-call 1))
1080 (t (multiple-value-call (fast-method-call-function ,method-call)
1081 (values (fast-method-call-pv ,method-call))
1082 (values (fast-method-call-next-method-call ,method-call))
1084 (sb-c::%more-arg-values ,more-context 0 ,more-count))))))
1086 (defstruct (fast-instance-boundp (:copier nil))
1087 (index 0 :type fixnum))
1089 #-sb-fluid (declaim (sb-ext:freeze-type fast-instance-boundp))
1091 (eval-when (:compile-toplevel :load-toplevel :execute)
1092 (defvar *allow-emf-call-tracing-p* nil)
1093 (defvar *enable-emf-call-tracing-p* #-sb-show nil #+sb-show t))
1095 ;;;; effective method functions
1097 (defvar *emf-call-trace-size* 200)
1098 (defvar *emf-call-trace* nil)
1099 (defvar *emf-call-trace-index* 0)
1101 ;;; This function was in the CMU CL version of PCL (ca Debian 2.4.8)
1102 ;;; without explanation. It appears to be intended for debugging, so
1103 ;;; it might be useful someday, so I haven't deleted it.
1104 ;;; But it isn't documented and isn't used for anything now, so
1105 ;;; I've conditionalized it out of the base system. -- WHN 19991213
1107 (defun show-emf-call-trace ()
1108 (when *emf-call-trace*
1109 (let ((j *emf-call-trace-index*)
1110 (*enable-emf-call-tracing-p* nil))
1111 (format t "~&(The oldest entries are printed first)~%")
1112 (dotimes-fixnum (i *emf-call-trace-size*)
1113 (let ((ct (aref *emf-call-trace* j)))
1114 (when ct (print ct)))
1116 (when (= j *emf-call-trace-size*)
1119 (defun trace-emf-call-internal (emf format args)
1120 (unless *emf-call-trace*
1121 (setq *emf-call-trace* (make-array *emf-call-trace-size*)))
1122 (setf (aref *emf-call-trace* *emf-call-trace-index*)
1123 (list* emf format args))
1124 (incf *emf-call-trace-index*)
1125 (when (= *emf-call-trace-index* *emf-call-trace-size*)
1126 (setq *emf-call-trace-index* 0)))
1128 (defmacro trace-emf-call (emf format args)
1129 (when *allow-emf-call-tracing-p*
1130 `(when *enable-emf-call-tracing-p*
1131 (trace-emf-call-internal ,emf ,format ,args))))
1133 (defmacro invoke-effective-method-function-fast
1134 (emf restp &key required-args rest-arg more-arg)
1136 (trace-emf-call ,emf ,restp (list ,@required-args rest-arg))
1138 `(invoke-fast-method-call/more ,emf
1141 `(invoke-fast-method-call ,emf
1146 (defun effective-method-optimized-slot-access-clause
1147 (emf restp required-args)
1148 ;; "What," you may wonder, "do these next two clauses do?" In that
1149 ;; case, you are not a PCL implementor, for they considered this to
1150 ;; be self-documenting.:-| Or CSR, for that matter, since he can
1151 ;; also figure it out by looking at it without breaking stride. For
1152 ;; the rest of us, though: From what the code is doing with .SLOTS.
1153 ;; and whatnot, evidently it's implementing SLOT-VALUEish and
1154 ;; GET-SLOT-VALUEish things. Then we can reason backwards and
1155 ;; conclude that setting EMF to a FIXNUM is an optimized way to
1156 ;; represent these slot access operations.
1158 (let ((length (length required-args)))
1161 (let* ((.slots. (get-slots-or-nil
1162 ,(car required-args)))
1163 (value (when .slots. (clos-slots-ref .slots. ,emf))))
1164 (if (eq value +slot-unbound+)
1165 (slot-unbound-internal ,(car required-args)
1170 (let ((.new-value. ,(car required-args))
1171 (.slots. (get-slots-or-nil
1172 ,(cadr required-args))))
1174 (setf (clos-slots-ref .slots. ,emf) .new-value.)))))))
1175 ;; (In cmucl-2.4.8 there was a commented-out third ,@(WHEN
1176 ;; ...) clause here to handle SLOT-BOUNDish stuff. Since
1177 ;; there was no explanation and presumably the code is 10+
1178 ;; years stale, I simply deleted it. -- WHN)
1181 ;;; Before SBCL 0.9.16.7 instead of
1182 ;;; INVOKE-NARROW-EFFECTIVE-METHOD-FUNCTION we passed a (THE (OR
1183 ;;; FUNCTION METHOD-CALL FAST-METHOD-CALL) EMF) form as the EMF. Now,
1184 ;;; to make less work for the compiler we take a path that doesn't
1185 ;;; involve the slot-accessor clause (where EMF is a FIXNUM) at all.
1186 (macrolet ((def (name &optional narrow)
1187 `(defmacro ,name (emf restp &key required-args rest-arg more-arg)
1188 (unless (constantp restp)
1189 (error "The RESTP argument is not constant."))
1190 (setq restp (constant-form-value restp))
1191 (with-unique-names (emf-n)
1193 (declare (optimize (sb-c:insert-step-conditions 0)))
1194 (let ((,emf-n ,emf))
1195 (trace-emf-call ,emf-n ,restp (list ,@required-args ,@rest-arg))
1199 `(invoke-fast-method-call/more ,emf-n
1202 `(invoke-fast-method-call ,emf-n
1207 `(effective-method-optimized-slot-access-clause
1208 emf-n restp required-args))
1210 (invoke-method-call ,emf-n ,restp ,@required-args
1214 `(apply ,emf-n ,@required-args ,@rest-arg)
1215 `(funcall ,emf-n ,@required-args
1216 ,@rest-arg))))))))))
1217 (def invoke-effective-method-function nil)
1218 (def invoke-narrow-effective-method-function t))
1220 (defun invoke-emf (emf args)
1221 (trace-emf-call emf t args)
1224 (let* ((arg-info (fast-method-call-arg-info emf))
1225 (restp (cdr arg-info))
1226 (nreq (car arg-info)))
1228 (apply (fast-method-call-function emf)
1229 (fast-method-call-pv emf)
1230 (fast-method-call-next-method-call emf)
1234 (invoke-fast-method-call emf nil)
1235 (error 'simple-program-error
1236 :format-control "invalid number of arguments: 0"
1237 :format-arguments nil)))
1240 (invoke-fast-method-call emf nil (car args))
1241 (error 'simple-program-error
1242 :format-control "invalid number of arguments: 1"
1243 :format-arguments nil)))
1246 (invoke-fast-method-call emf nil (car args) (cadr args))
1247 (error 'simple-program-error
1248 :format-control "invalid number of arguments: 2"
1249 :format-arguments nil)))
1251 (apply (fast-method-call-function emf)
1252 (fast-method-call-pv emf)
1253 (fast-method-call-next-method-call emf)
1256 (apply (method-call-function emf)
1258 (method-call-call-method-args emf)))
1261 (error 'simple-program-error
1262 :format-control "invalid number of arguments: 0"
1263 :format-arguments nil))
1265 (let* ((slots (get-slots (car args)))
1266 (value (clos-slots-ref slots emf)))
1267 (if (eq value +slot-unbound+)
1268 (slot-unbound-internal (car args) emf)
1271 (setf (clos-slots-ref (get-slots (cadr args)) emf)
1273 (t (error 'simple-program-error
1274 :format-control "invalid number of arguments"
1275 :format-arguments nil))))
1276 (fast-instance-boundp
1277 (if (or (null args) (cdr args))
1278 (error 'simple-program-error
1279 :format-control "invalid number of arguments"
1280 :format-arguments nil)
1281 (let ((slots (get-slots (car args))))
1282 (not (eq (clos-slots-ref slots (fast-instance-boundp-index emf))
1288 (defmacro fast-call-next-method-body ((args next-method-call rest-arg)
1291 `(if ,next-method-call
1292 ,(let ((call `(invoke-narrow-effective-method-function
1294 ,(not (null rest-arg))
1295 :required-args ,args
1296 :rest-arg ,(when rest-arg (list rest-arg)))))
1300 `(&rest ,rest-arg)))
1304 (call-no-next-method ',method-cell
1309 (defmacro bind-fast-lexical-method-functions
1310 ((args rest-arg next-method-call (&key
1320 (let* ((rebindings (when (or setq-p call-next-method-p)
1321 (mapcar (lambda (x) (list x x)) parameters-setqd))))
1322 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
1325 `(flet (,@(when call-next-method-p
1326 `((call-next-method (&rest cnm-args)
1327 (declare (dynamic-extent cnm-args)
1328 (muffle-conditions code-deletion-note)
1329 (optimize (sb-c:insert-step-conditions 0)))
1330 ,@(if (safe-code-p env)
1331 `((%check-cnm-args cnm-args (list ,@args)
1334 (fast-call-next-method-body (,args
1339 ,@(when next-method-p-p
1341 (declare (optimize (sb-c:insert-step-conditions 0)))
1342 (not (null ,next-method-call))))))
1346 ;;; CMUCL comment (Gerd Moellmann):
1348 ;;; The standard says it's an error if CALL-NEXT-METHOD is called with
1349 ;;; arguments, and the set of methods applicable to those arguments is
1350 ;;; different from the set of methods applicable to the original
1351 ;;; method arguments. (According to Barry Margolin, this rule was
1352 ;;; probably added to ensure that before and around methods are always
1353 ;;; run before primary methods.)
1355 ;;; This could be optimized for the case that the generic function
1356 ;;; doesn't have hairy methods, does have standard method combination,
1357 ;;; is a standard generic function, there are no methods defined on it
1358 ;;; for COMPUTE-APPLICABLE-METHODS and probably a lot more of such
1359 ;;; preconditions. That looks hairy and is probably not worth it,
1360 ;;; because this check will never be fast.
1361 (defun %check-cnm-args (cnm-args orig-args method-cell)
1362 ;; 1. Check for no arguments.
1364 (let* ((gf (method-generic-function (car method-cell)))
1365 (nreq (generic-function-nreq gf)))
1366 (declare (fixnum nreq))
1367 ;; 2. Requirement arguments pairwise: if all are EQL, the applicable
1368 ;; methods must be the same. This takes care of the relatively common
1369 ;; case of twiddling with &KEY arguments without being horribly
1371 (unless (do ((orig orig-args (cdr orig))
1372 (args cnm-args (cdr args))
1375 (unless (and orig args (eql (car orig) (car args)))
1377 ;; 3. Only then do the full check.
1378 (let ((omethods (compute-applicable-methods gf orig-args))
1379 (nmethods (compute-applicable-methods gf cnm-args)))
1380 (unless (equal omethods nmethods)
1381 (error "~@<The set of methods ~S applicable to argument~P ~
1382 ~{~S~^, ~} to call-next-method is different from ~
1383 the set of methods ~S applicable to the original ~
1384 method argument~P ~{~S~^, ~}.~@:>"
1385 nmethods (length cnm-args) cnm-args omethods
1386 (length orig-args) orig-args)))))))
1388 (defmacro bind-args ((lambda-list args) &body body)
1389 (let ((args-tail '.args-tail.)
1392 (flet ((process-var (var)
1393 (if (memq var lambda-list-keywords)
1396 (&optional (setq state 'optional))
1397 (&key (setq state 'key))
1399 (&rest (setq state 'rest))
1400 (&aux (setq state 'aux))
1403 "encountered the non-standard lambda list keyword ~S"
1407 (required `((,var (pop ,args-tail))))
1408 (optional (cond ((not (consp var))
1409 `((,var (when ,args-tail
1410 (pop ,args-tail)))))
1412 `((,(car var) (if ,args-tail
1416 `((,(caddr var) (not (null ,args-tail)))
1417 (,(car var) (if ,args-tail
1420 (rest `((,var ,args-tail)))
1421 (key (cond ((not (consp var))
1423 (get-key-arg-tail ,(keywordicate var)
1426 (multiple-value-bind (keyword variable)
1427 (if (consp (car var))
1430 (values (keywordicate (car var))
1432 `((,key (get-key-arg-tail ',keyword
1438 (multiple-value-bind (keyword variable)
1439 (if (consp (car var))
1442 (values (keywordicate (car var))
1444 `((,key (get-key-arg-tail ',keyword
1446 (,(caddr var) (not (null,key)))
1451 (let ((bindings (mapcan #'process-var lambda-list)))
1452 `(let* ((,args-tail ,args)
1455 ,@(when (eq state 'optional)
1456 `((unless (null ,args-tail)
1457 (error 'simple-program-error
1458 :format-control "surplus arguments: ~S"
1459 :format-arguments (list ,args-tail)))))))
1460 (declare (ignorable ,args-tail .dummy0.))
1463 (defun get-key-arg-tail (keyword list)
1464 (loop for (key . tail) on list by #'cddr
1466 ;; FIXME: Do we want to export this symbol? Or maybe use an
1467 ;; (ERROR 'SIMPLE-PROGRAM-ERROR) form?
1468 (sb-c::%odd-key-args-error)
1469 when (eq key keyword)
1472 (defun walk-method-lambda (method-lambda required-parameters env slots)
1473 (let (;; flag indicating that CALL-NEXT-METHOD should be in the
1474 ;; method definition
1475 (call-next-method-p nil)
1476 ;; flag indicating that #'CALL-NEXT-METHOD was seen in the
1479 ;; flag indicating that NEXT-METHOD-P should be in the method
1481 (next-method-p-p nil)
1482 ;; a list of all required parameters whose bindings might be
1483 ;; modified in the method body.
1484 (parameters-setqd nil))
1485 (flet ((walk-function (form context env)
1486 (cond ((not (eq context :eval)) form)
1487 ;; FIXME: Jumping to a conclusion from the way it's used
1488 ;; above, perhaps CONTEXT should be called SITUATION
1489 ;; (after the term used in the ANSI specification of
1490 ;; EVAL-WHEN) and given modern ANSI keyword values
1491 ;; like :LOAD-TOPLEVEL.
1492 ((not (listp form)) form)
1493 ((eq (car form) 'call-next-method)
1494 (setq call-next-method-p (if (cdr form)
1498 ((eq (car form) 'next-method-p)
1499 (setq next-method-p-p t)
1501 ((memq (car form) '(setq multiple-value-setq))
1502 ;; The walker will split (SETQ A 1 B 2) to
1503 ;; separate (SETQ A 1) and (SETQ B 2) forms, so we
1504 ;; only need to handle the simple case of SETQ
1506 (let ((vars (if (eq (car form) 'setq)
1507 (list (second form))
1510 ;; Note that we don't need to check for
1511 ;; %VARIABLE-REBINDING declarations like is
1512 ;; done in CAN-OPTIMIZE-ACCESS1, since the
1513 ;; bindings that will have that declation will
1515 (when (var-declaration '%class var env)
1516 ;; If a parameter binding is shadowed by
1517 ;; another binding it won't have a %CLASS
1518 ;; declaration anymore, and this won't get
1520 (pushnew var parameters-setqd :test #'eq))))
1522 ((and (eq (car form) 'function)
1523 (cond ((eq (cadr form) 'call-next-method)
1524 (setq call-next-method-p t)
1527 ((eq (cadr form) 'next-method-p)
1528 (setq next-method-p-p t)
1532 ((and (memq (car form)
1533 '(slot-value set-slot-value slot-boundp))
1534 (constantp (caddr form) env))
1535 (let ((fun (ecase (car form)
1536 (slot-value #'optimize-slot-value)
1537 (set-slot-value #'optimize-set-slot-value)
1538 (slot-boundp #'optimize-slot-boundp))))
1539 (funcall fun form slots required-parameters env)))
1542 (let ((walked-lambda (walk-form method-lambda env #'walk-function)))
1543 ;;; FIXME: the walker's rewriting of the source code causes
1544 ;;; trouble when doing code coverage. The rewrites should be
1545 ;;; removed, and the same operations done using
1546 ;;; compiler-macros or tranforms.
1547 (values (if (sb-c:policy env (= sb-c:store-coverage-data 0))
1553 (not (null parameters-setqd))
1554 parameters-setqd)))))
1556 (defun generic-function-name-p (name)
1557 (and (legal-fun-name-p name)
1559 (if (eq **boot-state** 'complete)
1560 (standard-generic-function-p (gdefinition name))
1561 (funcallable-instance-p (gdefinition name)))))
1563 (defun method-plist-value (method key &optional default)
1564 (let ((plist (if (consp method)
1565 (getf (early-method-initargs method) 'plist)
1566 (object-plist method))))
1567 (getf plist key default)))
1569 (defun (setf method-plist-value) (new-value method key &optional default)
1571 (setf (getf (getf (early-method-initargs method) 'plist) key default)
1573 (setf (getf (object-plist method) key default) new-value)))
1575 (defun load-defmethod (class name quals specls ll initargs source-location)
1576 (let ((method-cell (getf initargs 'method-cell)))
1577 (setq initargs (copy-tree initargs))
1579 (setf (getf initargs 'method-cell) method-cell))
1581 (setf (getf (getf initargs 'plist) :name)
1582 (make-method-spec name quals specls))
1583 (load-defmethod-internal class name quals specls
1584 ll initargs source-location)))
1586 (defun load-defmethod-internal
1587 (method-class gf-spec qualifiers specializers lambda-list
1588 initargs source-location)
1589 (when (and (eq **boot-state** 'complete)
1591 (let* ((gf (fdefinition gf-spec))
1592 (method (and (generic-function-p gf)
1593 (generic-function-methods gf)
1594 (find-method gf qualifiers specializers nil))))
1596 (warn 'sb-kernel:redefinition-with-defmethod
1598 :new-location source-location
1600 :qualifiers qualifiers :specializers specializers))))
1601 (let ((method (apply #'add-named-method
1602 gf-spec qualifiers specializers lambda-list
1603 :definition-source source-location
1605 (unless (or (eq method-class 'standard-method)
1606 (eq (find-class method-class nil) (class-of method)))
1607 ;; FIXME: should be STYLE-WARNING?
1608 (format *error-output*
1609 "~&At the time the method with qualifiers ~:S and~%~
1610 specializers ~:S on the generic function ~S~%~
1611 was compiled, the method-class for that generic function was~%~
1612 ~S. But, the method class is now ~S, this~%~
1613 may mean that this method was compiled improperly.~%"
1614 qualifiers specializers gf-spec
1615 method-class (class-name (class-of method))))
1618 (defun make-method-spec (gf qualifiers specializers)
1619 (let ((name (generic-function-name gf))
1620 (unparsed-specializers (unparse-specializers gf specializers)))
1621 `(slow-method ,name ,@qualifiers ,unparsed-specializers)))
1623 (defun initialize-method-function (initargs method)
1624 (let* ((mf (getf initargs :function))
1625 (mff (and (typep mf '%method-function)
1626 (%method-function-fast-function mf)))
1627 (plist (getf initargs 'plist))
1628 (name (getf plist :name))
1629 (method-cell (getf initargs 'method-cell)))
1631 (setf (car method-cell) method))
1634 (setq mf (set-fun-name mf name)))
1635 (when (and mff (consp name) (eq (car name) 'slow-method))
1636 (let ((fast-name `(fast-method ,@(cdr name))))
1637 (set-fun-name mff fast-name))))
1639 (let ((plist plist))
1640 (let ((snl (getf plist :slot-name-lists)))
1642 (setf (method-plist-value method :pv-table)
1643 (intern-pv-table :slot-name-lists snl))))))))
1645 (defun analyze-lambda-list (lambda-list)
1646 (flet (;; FIXME: Is this redundant with SB-C::MAKE-KEYWORD-FOR-ARG?
1647 (parse-key-arg (arg)
1649 (if (listp (car arg))
1651 (keywordicate (car arg)))
1652 (keywordicate arg))))
1658 (allow-other-keys-p nil)
1660 (keyword-parameters ())
1662 (dolist (x lambda-list)
1663 (if (memq x lambda-list-keywords)
1665 (&optional (setq state 'optional))
1668 (&allow-other-keys (setq allow-other-keys-p t))
1669 (&rest (setq restp t
1673 (error "encountered the non-standard lambda list keyword ~S"
1676 (required (incf nrequired))
1677 (optional (incf noptional))
1678 (key (push (parse-key-arg x) keywords)
1679 (push x keyword-parameters))
1680 (rest (incf nrest)))))
1681 (when (and restp (zerop nrest))
1682 (error "Error in lambda-list:~%~
1683 After &REST, a DEFGENERIC lambda-list ~
1684 must be followed by at least one variable."))
1685 (values nrequired noptional keysp restp allow-other-keys-p
1687 (reverse keyword-parameters)))))
1689 (defun keyword-spec-name (x)
1690 (let ((key (if (atom x) x (car x))))
1695 (defun ftype-declaration-from-lambda-list (lambda-list name)
1696 (multiple-value-bind (nrequired noptional keysp restp allow-other-keys-p
1697 keywords keyword-parameters)
1698 (analyze-lambda-list lambda-list)
1699 (declare (ignore keyword-parameters))
1700 (let* ((old (info :function :type name)) ;FIXME:FDOCUMENTATION instead?
1701 (old-ftype (if (fun-type-p old) old nil))
1702 (old-restp (and old-ftype (fun-type-rest old-ftype)))
1703 (old-keys (and old-ftype
1704 (mapcar #'key-info-name
1707 (old-keysp (and old-ftype (fun-type-keyp old-ftype)))
1708 (old-allowp (and old-ftype
1709 (fun-type-allowp old-ftype)))
1710 (keywords (union old-keys (mapcar #'keyword-spec-name keywords))))
1711 `(function ,(append (make-list nrequired :initial-element t)
1712 (when (plusp noptional)
1713 (append '(&optional)
1714 (make-list noptional :initial-element t)))
1715 (when (or restp old-restp)
1717 (when (or keysp old-keysp)
1719 (mapcar (lambda (key)
1722 (when (or allow-other-keys-p old-allowp)
1723 '(&allow-other-keys)))))
1726 ;;;; early generic function support
1728 (defvar *!early-generic-functions* ())
1730 (defun ensure-generic-function (fun-name
1732 &key environment definition-source
1734 (declare (ignore environment))
1735 (let ((existing (and (fboundp fun-name)
1736 (gdefinition fun-name))))
1737 (cond ((and existing
1738 (eq **boot-state** 'complete)
1739 (null (generic-function-p existing)))
1740 (generic-clobbers-function fun-name)
1741 (fmakunbound fun-name)
1742 (apply #'ensure-generic-function fun-name all-keys))
1744 (apply #'ensure-generic-function-using-class
1745 existing fun-name all-keys)))))
1747 (defun generic-clobbers-function (fun-name)
1748 (cerror "Replace the function binding"
1749 'simple-program-error
1750 :format-control "~S already names an ordinary function or a macro."
1751 :format-arguments (list fun-name)))
1753 (defvar *sgf-wrapper*
1754 (!boot-make-wrapper (early-class-size 'standard-generic-function)
1755 'standard-generic-function))
1757 (defvar *sgf-slots-init*
1758 (mapcar (lambda (canonical-slot)
1759 (if (memq (getf canonical-slot :name) '(arg-info source))
1761 (let ((initfunction (getf canonical-slot :initfunction)))
1763 (funcall initfunction)
1765 (early-collect-inheritance 'standard-generic-function)))
1767 (defconstant +sgf-method-class-index+
1768 (!bootstrap-slot-index 'standard-generic-function 'method-class))
1770 (defun early-gf-p (x)
1771 (and (fsc-instance-p x)
1772 (eq (clos-slots-ref (get-slots x) +sgf-method-class-index+)
1775 (defconstant +sgf-methods-index+
1776 (!bootstrap-slot-index 'standard-generic-function 'methods))
1778 (defmacro early-gf-methods (gf)
1779 `(clos-slots-ref (get-slots ,gf) +sgf-methods-index+))
1781 (defun safe-generic-function-methods (generic-function)
1782 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
1783 (clos-slots-ref (get-slots generic-function) +sgf-methods-index+)
1784 (generic-function-methods generic-function)))
1786 (defconstant +sgf-arg-info-index+
1787 (!bootstrap-slot-index 'standard-generic-function 'arg-info))
1789 (defmacro early-gf-arg-info (gf)
1790 `(clos-slots-ref (get-slots ,gf) +sgf-arg-info-index+))
1792 (defconstant +sgf-dfun-state-index+
1793 (!bootstrap-slot-index 'standard-generic-function 'dfun-state))
1795 (defstruct (arg-info
1797 (:constructor make-arg-info ())
1799 (arg-info-lambda-list :no-lambda-list)
1802 arg-info-number-optional
1804 arg-info-keys ;nil no &KEY or &REST allowed
1805 ;(k1 k2 ..) Each method must accept these &KEY arguments.
1806 ;T must have &KEY or &REST
1808 gf-info-simple-accessor-type ; nil, reader, writer, boundp
1809 (gf-precompute-dfun-and-emf-p nil) ; set by set-arg-info
1811 gf-info-static-c-a-m-emf
1812 (gf-info-c-a-m-emf-std-p t)
1815 #-sb-fluid (declaim (sb-ext:freeze-type arg-info))
1817 (defun arg-info-valid-p (arg-info)
1818 (not (null (arg-info-number-optional arg-info))))
1820 (defun arg-info-applyp (arg-info)
1821 (or (plusp (arg-info-number-optional arg-info))
1822 (arg-info-key/rest-p arg-info)))
1824 (defun arg-info-number-required (arg-info)
1825 (length (arg-info-metatypes arg-info)))
1827 (defun arg-info-nkeys (arg-info)
1828 (count-if (lambda (x) (neq x t)) (arg-info-metatypes arg-info)))
1830 (defun create-gf-lambda-list (lambda-list)
1831 ;;; Create a gf lambda list from a method lambda list
1832 (loop for x in lambda-list
1833 collect (if (consp x) (list (car x)) x)
1834 if (eq x '&key) do (loop-finish)))
1836 (defun set-arg-info (gf &key new-method (lambda-list nil lambda-list-p)
1837 argument-precedence-order)
1838 (let* ((arg-info (if (eq **boot-state** 'complete)
1840 (early-gf-arg-info gf)))
1841 (methods (if (eq **boot-state** 'complete)
1842 (generic-function-methods gf)
1843 (early-gf-methods gf)))
1844 (was-valid-p (integerp (arg-info-number-optional arg-info)))
1845 (first-p (and new-method (null (cdr methods)))))
1846 (when (and (not lambda-list-p) methods)
1847 (setq lambda-list (gf-lambda-list gf)))
1848 (when (or lambda-list-p
1850 (eq (arg-info-lambda-list arg-info) :no-lambda-list)))
1851 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1852 (analyze-lambda-list lambda-list)
1853 (when (and methods (not first-p))
1854 (let ((gf-nreq (arg-info-number-required arg-info))
1855 (gf-nopt (arg-info-number-optional arg-info))
1856 (gf-key/rest-p (arg-info-key/rest-p arg-info)))
1857 (unless (and (= nreq gf-nreq)
1859 (eq (or keysp restp) gf-key/rest-p))
1860 (error "The lambda-list ~S is incompatible with ~
1861 existing methods of ~S."
1863 (setf (arg-info-lambda-list arg-info)
1866 (create-gf-lambda-list lambda-list)))
1867 (when (or lambda-list-p argument-precedence-order
1868 (null (arg-info-precedence arg-info)))
1869 (setf (arg-info-precedence arg-info)
1870 (compute-precedence lambda-list nreq argument-precedence-order)))
1871 (setf (arg-info-metatypes arg-info) (make-list nreq))
1872 (setf (arg-info-number-optional arg-info) nopt)
1873 (setf (arg-info-key/rest-p arg-info) (not (null (or keysp restp))))
1874 (setf (arg-info-keys arg-info)
1876 (if allow-other-keys-p t keywords)
1877 (arg-info-key/rest-p arg-info)))))
1879 (check-method-arg-info gf arg-info new-method))
1880 (set-arg-info1 gf arg-info new-method methods was-valid-p first-p)
1883 (defun check-method-arg-info (gf arg-info method)
1884 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1885 (analyze-lambda-list (if (consp method)
1886 (early-method-lambda-list method)
1887 (method-lambda-list method)))
1888 (flet ((lose (string &rest args)
1889 (error 'simple-program-error
1890 :format-control "~@<attempt to add the method~2I~_~S~I~_~
1891 to the generic function~2I~_~S;~I~_~
1893 :format-arguments (list method gf string args)))
1894 (comparison-description (x y)
1895 (if (> x y) "more" "fewer")))
1896 (let ((gf-nreq (arg-info-number-required arg-info))
1897 (gf-nopt (arg-info-number-optional arg-info))
1898 (gf-key/rest-p (arg-info-key/rest-p arg-info))
1899 (gf-keywords (arg-info-keys arg-info)))
1900 (unless (= nreq gf-nreq)
1902 "the method has ~A required arguments than the generic function."
1903 (comparison-description nreq gf-nreq)))
1904 (unless (= nopt gf-nopt)
1906 "the method has ~A optional arguments than the generic function."
1907 (comparison-description nopt gf-nopt)))
1908 (unless (eq (or keysp restp) gf-key/rest-p)
1910 "the method and generic function differ in whether they accept~_~
1911 &REST or &KEY arguments."))
1912 (when (consp gf-keywords)
1913 (unless (or (and restp (not keysp))
1915 (every (lambda (k) (memq k keywords)) gf-keywords))
1916 (lose "the method does not accept each of the &KEY arguments~2I~_~
1920 (defconstant +sm-specializers-index+
1921 (!bootstrap-slot-index 'standard-method 'specializers))
1922 (defconstant +sm-%function-index+
1923 (!bootstrap-slot-index 'standard-method '%function))
1924 (defconstant +sm-qualifiers-index+
1925 (!bootstrap-slot-index 'standard-method 'qualifiers))
1927 ;;; FIXME: we don't actually need this; we could test for the exact
1928 ;;; class and deal with it as appropriate. In fact we probably don't
1929 ;;; need it anyway because we only use this for METHOD-SPECIALIZERS on
1930 ;;; the standard reader method for METHOD-SPECIALIZERS. Probably.
1931 (dolist (s '(specializers %function))
1932 (aver (= (symbol-value (intern (format nil "+SM-~A-INDEX+" s)))
1933 (!bootstrap-slot-index 'standard-reader-method s)
1934 (!bootstrap-slot-index 'standard-writer-method s)
1935 (!bootstrap-slot-index 'standard-boundp-method s)
1936 (!bootstrap-slot-index 'global-reader-method s)
1937 (!bootstrap-slot-index 'global-writer-method s)
1938 (!bootstrap-slot-index 'global-boundp-method s))))
1940 (defvar *standard-method-class-names*
1941 '(standard-method standard-reader-method
1942 standard-writer-method standard-boundp-method
1943 global-reader-method global-writer-method
1944 global-boundp-method))
1946 (declaim (list **standard-method-classes**))
1947 (defglobal **standard-method-classes** nil)
1949 (defun safe-method-specializers (method)
1950 (if (member (class-of method) **standard-method-classes** :test #'eq)
1951 (clos-slots-ref (std-instance-slots method) +sm-specializers-index+)
1952 (method-specializers method)))
1953 (defun safe-method-fast-function (method)
1954 (let ((mf (safe-method-function method)))
1955 (and (typep mf '%method-function)
1956 (%method-function-fast-function mf))))
1957 (defun safe-method-function (method)
1958 (if (member (class-of method) **standard-method-classes** :test #'eq)
1959 (clos-slots-ref (std-instance-slots method) +sm-%function-index+)
1960 (method-function method)))
1961 (defun safe-method-qualifiers (method)
1962 (if (member (class-of method) **standard-method-classes** :test #'eq)
1963 (clos-slots-ref (std-instance-slots method) +sm-qualifiers-index+)
1964 (method-qualifiers method)))
1966 (defun set-arg-info1 (gf arg-info new-method methods was-valid-p first-p)
1967 (let* ((existing-p (and methods (cdr methods) new-method))
1968 (nreq (length (arg-info-metatypes arg-info)))
1969 (metatypes (if existing-p
1970 (arg-info-metatypes arg-info)
1972 (type (if existing-p
1973 (gf-info-simple-accessor-type arg-info)
1975 (when (arg-info-valid-p arg-info)
1976 (dolist (method (if new-method (list new-method) methods))
1977 (let* ((specializers (if (or (eq **boot-state** 'complete)
1978 (not (consp method)))
1979 (safe-method-specializers method)
1980 (early-method-specializers method t)))
1981 (class (if (or (eq **boot-state** 'complete) (not (consp method)))
1983 (early-method-class method)))
1986 (or (not (eq **boot-state** 'complete))
1987 (eq (generic-function-method-combination gf)
1988 *standard-method-combination*)))
1989 (cond ((or (eq class *the-class-standard-reader-method*)
1990 (eq class *the-class-global-reader-method*))
1992 ((or (eq class *the-class-standard-writer-method*)
1993 (eq class *the-class-global-writer-method*))
1995 ((or (eq class *the-class-standard-boundp-method*)
1996 (eq class *the-class-global-boundp-method*))
1998 (setq metatypes (mapcar #'raise-metatype metatypes specializers))
1999 (setq type (cond ((null type) new-type)
2000 ((eq type new-type) type)
2002 (setf (arg-info-metatypes arg-info) metatypes)
2003 (setf (gf-info-simple-accessor-type arg-info) type)))
2004 (when (or (not was-valid-p) first-p)
2005 (multiple-value-bind (c-a-m-emf std-p)
2008 (compute-applicable-methods-emf gf))
2009 (setf (gf-info-static-c-a-m-emf arg-info) c-a-m-emf)
2010 (setf (gf-info-c-a-m-emf-std-p arg-info) std-p)
2011 (unless (gf-info-c-a-m-emf-std-p arg-info)
2012 (setf (gf-info-simple-accessor-type arg-info) t))))
2014 (let ((name (if (eq **boot-state** 'complete)
2015 (generic-function-name gf)
2016 (!early-gf-name gf))))
2017 (setf (gf-precompute-dfun-and-emf-p arg-info)
2021 *internal-pcl-generalized-fun-name-symbols*))
2023 (t (let* ((symbol (fun-name-block-name name))
2024 (package (symbol-package symbol)))
2025 (and (or (eq package *pcl-package*)
2026 (memq package (package-use-list *pcl-package*)))
2027 (not (eq package #.(find-package "CL")))
2028 ;; FIXME: this test will eventually be
2029 ;; superseded by the *internal-pcl...* test,
2030 ;; above. While we are in a process of
2031 ;; transition, however, it should probably
2033 (not (find #\Space (symbol-name symbol))))))))))
2034 (setf (gf-info-fast-mf-p arg-info)
2035 (or (not (eq **boot-state** 'complete))
2036 (let* ((method-class (generic-function-method-class gf))
2037 (methods (compute-applicable-methods
2038 #'make-method-lambda
2039 (list gf (class-prototype method-class)
2041 (and methods (null (cdr methods))
2042 (let ((specls (method-specializers (car methods))))
2043 (and (classp (car specls))
2044 (eq 'standard-generic-function
2045 (class-name (car specls)))
2046 (classp (cadr specls))
2047 (eq 'standard-method
2048 (class-name (cadr specls)))))))))
2051 ;;; This is the early definition of ENSURE-GENERIC-FUNCTION-USING-CLASS.
2053 ;;; The STATIC-SLOTS field of the funcallable instances used as early
2054 ;;; generic functions is used to store the early methods and early
2055 ;;; discriminator code for the early generic function. The static
2056 ;;; slots field of the fins contains a list whose:
2057 ;;; CAR - a list of the early methods on this early gf
2058 ;;; CADR - the early discriminator code for this method
2059 (defun ensure-generic-function-using-class (existing spec &rest keys
2060 &key (lambda-list nil
2062 argument-precedence-order
2066 (declare (ignore keys))
2067 (cond ((and existing (early-gf-p existing))
2069 (set-arg-info existing :lambda-list lambda-list))
2071 ((assoc spec *!generic-function-fixups* :test #'equal)
2073 (make-early-gf spec lambda-list lambda-list-p existing
2074 argument-precedence-order definition-source
2076 (bug "The function ~S is not already defined." spec)))
2078 (bug "~S should be on the list ~S."
2079 spec '*!generic-function-fixups*))
2081 (pushnew spec *!early-generic-functions* :test #'equal)
2082 (make-early-gf spec lambda-list lambda-list-p nil
2083 argument-precedence-order definition-source
2086 (defun make-early-gf (spec &optional lambda-list lambda-list-p
2087 function argument-precedence-order source-location
2089 (let ((fin (allocate-standard-funcallable-instance
2090 *sgf-wrapper* *sgf-slots-init*)))
2091 (set-funcallable-instance-function
2094 (if (eq spec 'print-object)
2095 #'(lambda (instance stream)
2096 (print-unreadable-object (instance stream :identity t)
2097 (format stream "std-instance")))
2098 #'(lambda (&rest args)
2099 (declare (ignore args))
2100 (error "The function of the funcallable-instance ~S~
2101 has not been set." fin)))))
2102 (setf (gdefinition spec) fin)
2103 (!bootstrap-set-slot 'standard-generic-function fin 'name spec)
2104 (!bootstrap-set-slot 'standard-generic-function fin
2105 'source source-location)
2106 (!bootstrap-set-slot 'standard-generic-function fin
2107 '%documentation documentation)
2108 (set-fun-name fin spec)
2109 (let ((arg-info (make-arg-info)))
2110 (setf (early-gf-arg-info fin) arg-info)
2112 (setf (info :function :type spec)
2114 (ftype-declaration-from-lambda-list lambda-list spec))
2115 (info :function :where-from spec) :defined-method)
2116 (if argument-precedence-order
2118 :lambda-list lambda-list
2119 :argument-precedence-order argument-precedence-order)
2120 (set-arg-info fin :lambda-list lambda-list))))
2123 (defun safe-gf-dfun-state (generic-function)
2124 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2125 (clos-slots-ref (fsc-instance-slots generic-function) +sgf-dfun-state-index+)
2126 (gf-dfun-state generic-function)))
2127 (defun (setf safe-gf-dfun-state) (new-value generic-function)
2128 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2129 (setf (clos-slots-ref (fsc-instance-slots generic-function)
2130 +sgf-dfun-state-index+)
2132 (setf (gf-dfun-state generic-function) new-value)))
2134 (defun set-dfun (gf &optional dfun cache info)
2135 (let ((new-state (if (and dfun (or cache info))
2136 (list* dfun cache info)
2139 ((eq **boot-state** 'complete)
2140 ;; Check that we are under the lock.
2142 (aver (eq sb-thread:*current-thread* (sb-thread:mutex-owner (gf-lock gf))))
2143 (setf (safe-gf-dfun-state gf) new-state))
2145 (setf (clos-slots-ref (get-slots gf) +sgf-dfun-state-index+)
2149 (defun gf-dfun-cache (gf)
2150 (let ((state (if (eq **boot-state** 'complete)
2151 (safe-gf-dfun-state gf)
2152 (clos-slots-ref (get-slots gf) +sgf-dfun-state-index+))))
2155 (cons (cadr state)))))
2157 (defun gf-dfun-info (gf)
2158 (let ((state (if (eq **boot-state** 'complete)
2159 (safe-gf-dfun-state gf)
2160 (clos-slots-ref (get-slots gf) +sgf-dfun-state-index+))))
2163 (cons (cddr state)))))
2165 (defconstant +sgf-name-index+
2166 (!bootstrap-slot-index 'standard-generic-function 'name))
2168 (defun !early-gf-name (gf)
2169 (clos-slots-ref (get-slots gf) +sgf-name-index+))
2171 (defun gf-lambda-list (gf)
2172 (let ((arg-info (if (eq **boot-state** 'complete)
2174 (early-gf-arg-info gf))))
2175 (if (eq :no-lambda-list (arg-info-lambda-list arg-info))
2176 (let ((methods (if (eq **boot-state** 'complete)
2177 (generic-function-methods gf)
2178 (early-gf-methods gf))))
2181 (warn "no way to determine the lambda list for ~S" gf)
2183 (let* ((method (car (last methods)))
2184 (ll (if (consp method)
2185 (early-method-lambda-list method)
2186 (method-lambda-list method))))
2187 (create-gf-lambda-list ll))))
2188 (arg-info-lambda-list arg-info))))
2190 (defmacro real-ensure-gf-internal (gf-class all-keys env)
2192 (cond ((symbolp ,gf-class)
2193 (setq ,gf-class (find-class ,gf-class t ,env)))
2194 ((classp ,gf-class))
2196 (error "The :GENERIC-FUNCTION-CLASS argument (~S) was neither a~%~
2197 class nor a symbol that names a class."
2199 (unless (class-finalized-p ,gf-class)
2200 (if (class-has-a-forward-referenced-superclass-p ,gf-class)
2201 ;; FIXME: reference MOP documentation -- this is an
2202 ;; additional requirement on our users
2203 (error "The generic function class ~S is not finalizeable" ,gf-class)
2204 (finalize-inheritance ,gf-class)))
2205 (remf ,all-keys :generic-function-class)
2206 (remf ,all-keys :environment)
2207 (let ((combin (getf ,all-keys :method-combination)))
2210 (setf (getf ,all-keys :method-combination)
2211 (find-method-combination (class-prototype ,gf-class)
2214 ((or null method-combination))))
2215 (let ((method-class (getf ,all-keys :method-class '.shes-not-there.)))
2216 (unless (eq method-class '.shes-not-there.)
2217 (setf (getf ,all-keys :method-class)
2218 (cond ((classp method-class)
2220 (t (find-class method-class t ,env))))))))
2222 (defun note-gf-signature (fun-name lambda-list-p lambda-list)
2223 (unless lambda-list-p
2224 ;; Use the existing lambda-list, if any. It is reasonable to do eg.
2226 ;; (if (fboundp name)
2227 ;; (ensure-generic-function name)
2228 ;; (ensure-generic-function name :lambda-list '(foo)))
2230 ;; in which case we end up here with no lambda-list in the first leg.
2231 (setf (values lambda-list lambda-list-p)
2233 (values (generic-function-lambda-list (fdefinition fun-name))
2235 ((or warning error) ()
2236 (values nil nil)))))
2240 (ftype-declaration-from-lambda-list lambda-list fun-name)
2243 ;; FIXME: Ideally we would like to not clobber it, but because generic
2244 ;; functions assert their FTYPEs callers believing the FTYPE are left with
2245 ;; unsafe assumptions. Hence the clobbering. Be quiet when the new type
2246 ;; is a subtype of the old one, though -- even though the type is not
2247 ;; trusted anymore, the warning is still not quite as interesting.
2248 (when (and (eq :declared (info :function :where-from fun-name))
2249 (not (csubtypep gf-type (setf old-type (info :function :type fun-name)))))
2250 (style-warn "~@<Generic function ~S clobbers an earlier ~S proclamation ~S ~
2251 for the same name with ~S.~:@>"
2253 (type-specifier old-type)
2254 (type-specifier gf-type)))
2255 (setf (info :function :type fun-name) gf-type
2256 (info :function :where-from fun-name) :defined-method)
2259 (defun real-ensure-gf-using-class--generic-function
2263 &key environment (lambda-list nil lambda-list-p)
2264 (generic-function-class 'standard-generic-function)
2266 (real-ensure-gf-internal generic-function-class all-keys environment)
2267 ;; KLUDGE: the above macro does SETQ on GENERIC-FUNCTION-CLASS,
2268 ;; which is what makes the next line work
2269 (unless (eq (class-of existing) generic-function-class)
2270 (change-class existing generic-function-class))
2272 (apply #'reinitialize-instance existing all-keys)
2273 (note-gf-signature fun-name lambda-list-p lambda-list)))
2275 (defun real-ensure-gf-using-class--null
2279 &key environment (lambda-list nil lambda-list-p)
2280 (generic-function-class 'standard-generic-function)
2282 (declare (ignore existing))
2283 (real-ensure-gf-internal generic-function-class all-keys environment)
2285 (setf (gdefinition fun-name)
2286 (apply #'make-instance generic-function-class
2287 :name fun-name all-keys))
2288 (note-gf-signature fun-name lambda-list-p lambda-list)))
2290 (defun safe-gf-arg-info (generic-function)
2291 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2292 (clos-slots-ref (fsc-instance-slots generic-function)
2293 +sgf-arg-info-index+)
2294 (gf-arg-info generic-function)))
2296 ;;; FIXME: this function took on a slightly greater role than it
2297 ;;; previously had around 2005-11-02, when CSR fixed the bug whereby
2298 ;;; having more than one subclass of standard-generic-function caused
2299 ;;; the whole system to die horribly through a metacircle in
2300 ;;; GF-ARG-INFO. The fix is to be slightly more disciplined about
2301 ;;; calling accessor methods -- we call GET-GENERIC-FUN-INFO when
2302 ;;; computing discriminating functions, so we need to be careful about
2303 ;;; having a base case for the recursion, and we provide that with the
2304 ;;; STANDARD-GENERIC-FUNCTION case below. However, we are not (yet)
2305 ;;; as disciplined as CLISP's CLOS/MOP, and it would be nice to get to
2306 ;;; that stage, where all potentially dangerous cases are enumerated
2307 ;;; and stopped. -- CSR, 2005-11-02.
2308 (defun get-generic-fun-info (gf)
2309 ;; values nreq applyp metatypes nkeys arg-info
2310 (multiple-value-bind (applyp metatypes arg-info)
2311 (let* ((arg-info (if (early-gf-p gf)
2312 (early-gf-arg-info gf)
2313 (safe-gf-arg-info gf)))
2314 (metatypes (arg-info-metatypes arg-info)))
2315 (values (arg-info-applyp arg-info)
2320 (declare (fixnum nreq nkeys))
2321 (dolist (x metatypes)
2325 (values nreq applyp metatypes
2329 (defun generic-function-nreq (gf)
2330 (let* ((arg-info (if (early-gf-p gf)
2331 (early-gf-arg-info gf)
2332 (safe-gf-arg-info gf)))
2333 (metatypes (arg-info-metatypes arg-info)))
2334 (declare (list metatypes))
2335 (length metatypes)))
2337 (defun early-make-a-method (class qualifiers arglist specializers initargs doc
2338 &key slot-name object-class method-class-function
2342 ;; Figure out whether we got class objects or class names as the
2343 ;; specializers and set parsed and unparsed appropriately. If we
2344 ;; got class objects, then we can compute unparsed, but if we got
2345 ;; class names we don't try to compute parsed.
2347 ;; Note that the use of not symbolp in this call to every should be
2348 ;; read as 'classp' we can't use classp itself because it doesn't
2350 (if (every (lambda (s) (not (symbolp s))) specializers)
2351 (setq parsed specializers
2352 unparsed (mapcar (lambda (s)
2353 (if (eq s t) t (class-name s)))
2355 (setq unparsed specializers
2360 (getf initargs :function)
2361 (let ((mf (getf initargs :function)))
2363 (and (typep mf '%method-function)
2364 (%method-function-fast-function mf)))
2366 ;; the parsed specializers. This is used by
2367 ;; EARLY-METHOD-SPECIALIZERS to cache the parse.
2368 ;; Note that this only comes into play when there is
2369 ;; more than one early method on an early gf.
2372 ;; A list to which REAL-MAKE-A-METHOD can be applied
2373 ;; to make a real method corresponding to this early
2376 (list class qualifiers arglist unparsed
2379 (list :slot-name slot-name :object-class object-class
2380 :method-class-function method-class-function))
2381 (list :definition-source definition-source)))))
2382 (initialize-method-function initargs result)
2385 (defun real-make-a-method
2386 (class qualifiers lambda-list specializers initargs doc
2387 &rest args &key slot-name object-class method-class-function
2389 (if method-class-function
2390 (let* ((object-class (if (classp object-class) object-class
2391 (find-class object-class)))
2392 (slots (class-direct-slots object-class))
2393 (slot-definition (find slot-name slots
2394 :key #'slot-definition-name)))
2396 (aver slot-definition)
2397 (let ((initargs (list* :qualifiers qualifiers :lambda-list lambda-list
2398 :specializers specializers :documentation doc
2399 :slot-definition slot-definition
2400 :slot-name slot-name initargs)))
2401 (apply #'make-instance
2402 (apply method-class-function object-class slot-definition
2404 :definition-source definition-source
2406 (apply #'make-instance class :qualifiers qualifiers
2407 :lambda-list lambda-list :specializers specializers
2408 :documentation doc (append args initargs))))
2410 (defun early-method-function (early-method)
2411 (values (cadr early-method) (caddr early-method)))
2413 (defun early-method-class (early-method)
2414 (find-class (car (fifth early-method))))
2416 (defun early-method-standard-accessor-p (early-method)
2417 (let ((class (first (fifth early-method))))
2418 (or (eq class 'standard-reader-method)
2419 (eq class 'standard-writer-method)
2420 (eq class 'standard-boundp-method))))
2422 (defun early-method-standard-accessor-slot-name (early-method)
2423 (eighth (fifth early-method)))
2425 ;;; Fetch the specializers of an early method. This is basically just
2426 ;;; a simple accessor except that when the second argument is t, this
2427 ;;; converts the specializers from symbols into class objects. The
2428 ;;; class objects are cached in the early method, this makes
2429 ;;; bootstrapping faster because the class objects only have to be
2433 ;;; The second argument should only be passed as T by
2434 ;;; early-lookup-method. This is to implement the rule that only when
2435 ;;; there is more than one early method on a generic function is the
2436 ;;; conversion from class names to class objects done. This
2437 ;;; corresponds to the fact that we are only allowed to have one
2438 ;;; method on any generic function up until the time classes exist.
2439 (defun early-method-specializers (early-method &optional objectsp)
2440 (if (and (listp early-method)
2441 (eq (car early-method) :early-method))
2442 (cond ((eq objectsp t)
2443 (or (fourth early-method)
2444 (setf (fourth early-method)
2445 (mapcar #'find-class (cadddr (fifth early-method))))))
2447 (fourth (fifth early-method))))
2448 (error "~S is not an early-method." early-method)))
2450 (defun early-method-qualifiers (early-method)
2451 (second (fifth early-method)))
2453 (defun early-method-lambda-list (early-method)
2454 (third (fifth early-method)))
2456 (defun early-method-initargs (early-method)
2457 (fifth (fifth early-method)))
2459 (defun (setf early-method-initargs) (new-value early-method)
2460 (setf (fifth (fifth early-method)) new-value))
2462 (defun early-add-named-method (generic-function-name qualifiers
2463 specializers arglist &rest initargs
2464 &key documentation definition-source
2466 (let* (;; we don't need to deal with the :generic-function-class
2467 ;; argument here because the default,
2468 ;; STANDARD-GENERIC-FUNCTION, is right for all early generic
2469 ;; functions. (See REAL-ADD-NAMED-METHOD)
2470 (gf (ensure-generic-function generic-function-name))
2472 (dolist (m (early-gf-methods gf))
2473 (when (and (equal (early-method-specializers m) specializers)
2474 (equal (early-method-qualifiers m) qualifiers))
2476 (setf (getf (getf initargs 'plist) :name)
2477 (make-method-spec gf qualifiers specializers))
2478 (let ((new (make-a-method 'standard-method qualifiers arglist
2479 specializers initargs documentation
2480 :definition-source definition-source)))
2481 (when existing (remove-method gf existing))
2482 (add-method gf new))))
2484 ;;; This is the early version of ADD-METHOD. Later this will become a
2485 ;;; generic function. See !FIX-EARLY-GENERIC-FUNCTIONS which has
2486 ;;; special knowledge about ADD-METHOD.
2487 (defun add-method (generic-function method)
2488 (when (not (fsc-instance-p generic-function))
2489 (error "Early ADD-METHOD didn't get a funcallable instance."))
2490 (when (not (and (listp method) (eq (car method) :early-method)))
2491 (error "Early ADD-METHOD didn't get an early method."))
2492 (push method (early-gf-methods generic-function))
2493 (set-arg-info generic-function :new-method method)
2494 (unless (assoc (!early-gf-name generic-function)
2495 *!generic-function-fixups*
2497 (update-dfun generic-function)))
2499 ;;; This is the early version of REMOVE-METHOD. See comments on
2500 ;;; the early version of ADD-METHOD.
2501 (defun remove-method (generic-function method)
2502 (when (not (fsc-instance-p generic-function))
2503 (error "An early remove-method didn't get a funcallable instance."))
2504 (when (not (and (listp method) (eq (car method) :early-method)))
2505 (error "An early remove-method didn't get an early method."))
2506 (setf (early-gf-methods generic-function)
2507 (remove method (early-gf-methods generic-function)))
2508 (set-arg-info generic-function)
2509 (unless (assoc (!early-gf-name generic-function)
2510 *!generic-function-fixups*
2512 (update-dfun generic-function)))
2514 ;;; This is the early version of GET-METHOD. See comments on the early
2515 ;;; version of ADD-METHOD.
2516 (defun get-method (generic-function qualifiers specializers
2517 &optional (errorp t))
2518 (if (early-gf-p generic-function)
2519 (or (dolist (m (early-gf-methods generic-function))
2520 (when (and (or (equal (early-method-specializers m nil)
2522 (equal (early-method-specializers m t)
2524 (equal (early-method-qualifiers m) qualifiers))
2527 (error "can't get early method")
2529 (real-get-method generic-function qualifiers specializers errorp)))
2531 (defun !fix-early-generic-functions ()
2532 (let ((accessors nil))
2533 ;; Rearrange *!EARLY-GENERIC-FUNCTIONS* to speed up
2534 ;; FIX-EARLY-GENERIC-FUNCTIONS.
2535 (dolist (early-gf-spec *!early-generic-functions*)
2536 (when (every #'early-method-standard-accessor-p
2537 (early-gf-methods (gdefinition early-gf-spec)))
2538 (push early-gf-spec accessors)))
2539 (dolist (spec (nconc accessors
2540 '(accessor-method-slot-name
2541 generic-function-methods
2546 slot-definition-location
2547 slot-definition-name
2550 class-precedence-list
2551 slot-boundp-using-class
2552 (setf slot-value-using-class)
2553 slot-value-using-class
2556 funcallable-standard-class-p
2559 (setq *!early-generic-functions*
2561 (delete spec *!early-generic-functions* :test #'equal))))
2563 (dolist (early-gf-spec *!early-generic-functions*)
2564 (/show early-gf-spec)
2565 (let* ((gf (gdefinition early-gf-spec))
2566 (methods (mapcar (lambda (early-method)
2567 (let ((args (copy-list (fifth
2570 (early-method-specializers
2572 (apply #'real-make-a-method args)))
2573 (early-gf-methods gf))))
2574 (setf (generic-function-method-class gf) *the-class-standard-method*)
2575 (setf (generic-function-method-combination gf)
2576 *standard-method-combination*)
2577 (set-methods gf methods)))
2579 (dolist (fn *!early-functions*)
2581 (setf (gdefinition (car fn)) (fdefinition (caddr fn))))
2583 (dolist (fixup *!generic-function-fixups*)
2585 (let* ((fspec (car fixup))
2586 (gf (gdefinition fspec))
2587 (methods (mapcar (lambda (method)
2588 (let* ((lambda-list (first method))
2589 (specializers (mapcar #'find-class (second method)))
2590 (method-fn-name (third method))
2591 (fn-name (or method-fn-name fspec))
2592 (fn (fdefinition fn-name))
2596 (lambda (args next-methods)
2600 `(call ,fn-name)))))
2601 (declare (type function fn))
2602 (make-a-method 'standard-method
2609 (setf (generic-function-method-class gf) *the-class-standard-method*)
2610 (setf (generic-function-method-combination gf)
2611 *standard-method-combination*)
2612 (set-methods gf methods))))
2613 (/show "leaving !FIX-EARLY-GENERIC-FUNCTIONS"))
2615 ;;; PARSE-DEFMETHOD is used by DEFMETHOD to parse the &REST argument
2616 ;;; into the 'real' arguments. This is where the syntax of DEFMETHOD
2617 ;;; is really implemented.
2618 (defun parse-defmethod (cdr-of-form)
2619 (declare (list cdr-of-form))
2620 (let ((qualifiers ())
2622 (loop (if (and (car cdr-of-form) (atom (car cdr-of-form)))
2623 (push (pop cdr-of-form) qualifiers)
2624 (return (setq qualifiers (nreverse qualifiers)))))
2625 (setq spec-ll (pop cdr-of-form))
2626 (values qualifiers spec-ll cdr-of-form)))
2628 (defun parse-specializers (generic-function specializers)
2629 (declare (list specializers))
2630 (flet ((parse (spec)
2631 (parse-specializer-using-class generic-function spec)))
2632 (mapcar #'parse specializers)))
2634 (defun unparse-specializers (generic-function specializers)
2635 (declare (list specializers))
2636 (flet ((unparse (spec)
2637 (unparse-specializer-using-class generic-function spec)))
2638 (mapcar #'unparse specializers)))
2640 (defun extract-parameters (specialized-lambda-list)
2641 (multiple-value-bind (parameters ignore1 ignore2)
2642 (parse-specialized-lambda-list specialized-lambda-list)
2643 (declare (ignore ignore1 ignore2))
2646 (defun extract-lambda-list (specialized-lambda-list)
2647 (multiple-value-bind (ignore1 lambda-list ignore2)
2648 (parse-specialized-lambda-list specialized-lambda-list)
2649 (declare (ignore ignore1 ignore2))
2652 (defun extract-specializer-names (specialized-lambda-list)
2653 (multiple-value-bind (ignore1 ignore2 specializers)
2654 (parse-specialized-lambda-list specialized-lambda-list)
2655 (declare (ignore ignore1 ignore2))
2658 (defun extract-required-parameters (specialized-lambda-list)
2659 (multiple-value-bind (ignore1 ignore2 ignore3 required-parameters)
2660 (parse-specialized-lambda-list specialized-lambda-list)
2661 (declare (ignore ignore1 ignore2 ignore3))
2662 required-parameters))
2664 (define-condition specialized-lambda-list-error
2665 (reference-condition simple-program-error)
2667 (:default-initargs :references (list '(:ansi-cl :section (3 4 3)))))
2669 (defun parse-specialized-lambda-list
2671 &optional supplied-keywords (allowed-keywords '(&optional &rest &key &aux))
2672 &aux (specialized-lambda-list-keywords
2673 '(&optional &rest &key &allow-other-keys &aux)))
2674 (let ((arg (car arglist)))
2675 (cond ((null arglist) (values nil nil nil nil))
2677 (values nil arglist nil nil))
2678 ((memq arg lambda-list-keywords)
2679 ;; non-standard lambda-list-keywords are errors.
2680 (unless (memq arg specialized-lambda-list-keywords)
2681 (error 'specialized-lambda-list-error
2682 :format-control "unknown specialized-lambda-list ~
2684 :format-arguments (list arg)))
2685 ;; no multiple &rest x &rest bla specifying
2686 (when (memq arg supplied-keywords)
2687 (error 'specialized-lambda-list-error
2688 :format-control "multiple occurrence of ~
2689 specialized-lambda-list keyword ~S~%"
2690 :format-arguments (list arg)))
2691 ;; And no placing &key in front of &optional, either.
2692 (unless (memq arg allowed-keywords)
2693 (error 'specialized-lambda-list-error
2694 :format-control "misplaced specialized-lambda-list ~
2696 :format-arguments (list arg)))
2697 ;; When we are at a lambda-list keyword, the parameters
2698 ;; don't include the lambda-list keyword; the lambda-list
2699 ;; does include the lambda-list keyword; and no
2700 ;; specializers are allowed to follow the lambda-list
2701 ;; keywords (at least for now).
2702 (multiple-value-bind (parameters lambda-list)
2703 (parse-specialized-lambda-list (cdr arglist)
2704 (cons arg supplied-keywords)
2706 (cons '&allow-other-keys
2707 (cdr (member arg allowed-keywords)))
2708 (cdr (member arg allowed-keywords))))
2709 (when (and (eq arg '&rest)
2710 (or (null lambda-list)
2711 (memq (car lambda-list)
2712 specialized-lambda-list-keywords)
2713 (not (or (null (cadr lambda-list))
2714 (memq (cadr lambda-list)
2715 specialized-lambda-list-keywords)))))
2716 (error 'specialized-lambda-list-error
2718 "in a specialized-lambda-list, excactly one ~
2719 variable must follow &REST.~%"
2720 :format-arguments nil))
2722 (cons arg lambda-list)
2726 ;; After a lambda-list keyword there can be no specializers.
2727 (multiple-value-bind (parameters lambda-list)
2728 (parse-specialized-lambda-list (cdr arglist)
2731 (values (cons (if (listp arg) (car arg) arg) parameters)
2732 (cons arg lambda-list)
2736 (multiple-value-bind (parameters lambda-list specializers required)
2737 (parse-specialized-lambda-list (cdr arglist))
2738 ;; Check for valid arguments.
2739 (unless (or (and (symbolp arg) (not (null arg)))
2743 (error 'specialized-lambda-list-error
2744 :format-control "arg is not a non-NIL symbol or a list of two elements: ~A"
2745 :format-arguments (list arg)))
2746 (values (cons (if (listp arg) (car arg) arg) parameters)
2747 (cons (if (listp arg) (car arg) arg) lambda-list)
2748 (cons (if (listp arg) (cadr arg) t) specializers)
2749 (cons (if (listp arg) (car arg) arg) required)))))))
2751 (setq **boot-state** 'early)
2753 ;;; FIXME: In here there was a #-CMU definition of SYMBOL-MACROLET
2754 ;;; which used %WALKER stuff. That suggests to me that maybe the code
2755 ;;; walker stuff was only used for implementing stuff like that; maybe
2756 ;;; it's not needed any more? Hunt down what it was used for and see.
2758 (defun extract-the (form)
2759 (cond ((and (consp form) (eq (car form) 'the))
2760 (aver (proper-list-of-length-p form 3))
2765 (defmacro with-slots (slots instance &body body)
2766 (let ((in (gensym)))
2767 `(let ((,in ,instance))
2768 (declare (ignorable ,in))
2769 ,@(let ((instance (extract-the instance)))
2770 (and (symbolp instance)
2771 `((declare (%variable-rebinding ,in ,instance)))))
2773 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2775 (if (symbolp slot-entry)
2779 (if (symbolp slot-entry)
2781 (cadr slot-entry))))
2783 (slot-value ,in ',slot-name))))
2787 (defmacro with-accessors (slots instance &body body)
2788 (let ((in (gensym)))
2789 `(let ((,in ,instance))
2790 (declare (ignorable ,in))
2791 ,@(let ((instance (extract-the instance)))
2792 (and (symbolp instance)
2793 `((declare (%variable-rebinding ,in ,instance)))))
2795 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2796 (let ((var-name (car slot-entry))
2797 (accessor-name (cadr slot-entry)))
2798 `(,var-name (,accessor-name ,in))))