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
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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)))
175 (consp (cadr option))
176 (member (first (cadr option))
177 ;; FIXME: this list is slightly weird.
178 ;; ANSI (on the DEFGENERIC page) in one
179 ;; place allows only OPTIMIZE; in
180 ;; another place gives this list of
181 ;; disallowed declaration specifiers.
182 ;; This seems to be the only place where
183 ;; the FUNCTION declaration is
184 ;; mentioned; TYPE seems to be missing.
185 ;; Very strange. -- CSR, 2002-10-21
186 '(declaration ftype function
187 inline notinline special)))
188 (error 'simple-program-error
189 :format-control "The declaration specifier ~S ~
190 is not allowed inside DEFGENERIC."
191 :format-arguments (list (cadr option))))
192 (push (cadr option) (initarg :declarations)))
194 (when (initarg car-option)
195 (duplicate-option car-option))
196 (unless (symbolp (cadr option))
197 (error 'simple-program-error
198 :format-control "METHOD-COMBINATION name not a ~
200 :format-arguments (list (cadr option))))
201 (setf (initarg car-option)
203 (:argument-precedence-order
204 (let* ((required (parse-lambda-list lambda-list))
205 (supplied (cdr option)))
206 (unless (= (length required) (length supplied))
207 (error 'simple-program-error
208 :format-control "argument count discrepancy in ~
209 :ARGUMENT-PRECEDENCE-ORDER clause."
210 :format-arguments nil))
211 (when (set-difference required supplied)
212 (error 'simple-program-error
213 :format-control "unequal sets for ~
214 :ARGUMENT-PRECEDENCE-ORDER clause: ~
216 :format-arguments (list required supplied)))
217 (setf (initarg car-option)
219 ((:documentation :generic-function-class :method-class)
220 (unless (proper-list-of-length-p option 2)
221 (error "bad list length for ~S" option))
222 (if (initarg car-option)
223 (duplicate-option car-option)
224 (setf (initarg car-option) `',(cadr option))))
226 (push (cdr option) methods))
228 ;; ANSI requires that unsupported things must get a
230 (error 'simple-program-error
231 :format-control "unsupported option ~S"
232 :format-arguments (list option))))))
234 (when (initarg :declarations)
235 (setf (initarg :declarations)
236 `',(initarg :declarations))))
238 (eval-when (:compile-toplevel :load-toplevel :execute)
239 (compile-or-load-defgeneric ',fun-name))
240 (load-defgeneric ',fun-name ',lambda-list
241 (sb-c:source-location) ,@initargs)
242 ,@(mapcar #'expand-method-definition methods)
243 (fdefinition ',fun-name)))))
245 (defun compile-or-load-defgeneric (fun-name)
246 (proclaim-as-fun-name fun-name)
247 (note-name-defined fun-name :function)
248 (unless (eq (info :function :where-from fun-name) :declared)
249 (setf (info :function :where-from fun-name) :defined)
250 (setf (info :function :type fun-name)
251 (specifier-type 'function))))
253 (defun load-defgeneric (fun-name lambda-list source-location &rest initargs)
254 (when (fboundp fun-name)
255 (style-warn "redefining ~S in DEFGENERIC" fun-name)
256 (let ((fun (fdefinition fun-name)))
257 (when (generic-function-p fun)
258 (loop for method in (generic-function-initial-methods fun)
259 do (remove-method fun method))
260 (setf (generic-function-initial-methods fun) '()))))
261 (apply #'ensure-generic-function
263 :lambda-list lambda-list
264 :definition-source source-location
267 (define-condition generic-function-lambda-list-error
268 (reference-condition simple-program-error)
270 (:default-initargs :references (list '(:ansi-cl :section (3 4 2)))))
272 (defun check-gf-lambda-list (lambda-list)
273 (flet ((ensure (arg ok)
275 (error 'generic-function-lambda-list-error
277 "~@<invalid ~S ~_in the generic function lambda list ~S~:>"
278 :format-arguments (list arg lambda-list)))))
279 (multiple-value-bind (required optional restp rest keyp keys allowp
280 auxp aux morep more-context more-count)
281 (parse-lambda-list lambda-list)
282 (declare (ignore required)) ; since they're no different in a gf ll
283 (declare (ignore restp rest)) ; since they're no different in a gf ll
284 (declare (ignore allowp)) ; since &ALLOW-OTHER-KEYS is fine either way
285 (declare (ignore aux)) ; since we require AUXP=NIL
286 (declare (ignore more-context more-count)) ; safely ignored unless MOREP
287 ;; no defaults allowed for &OPTIONAL arguments
289 (ensure i (or (symbolp i)
290 (and (consp i) (symbolp (car i)) (null (cdr i))))))
291 ;; no defaults allowed for &KEY arguments
294 (ensure i (or (symbolp i)
296 (or (symbolp (car i))
304 (error "&AUX is not allowed in a generic function lambda list: ~S"
306 ;; Oh, *puhlease*... not specifically as per section 3.4.2 of
307 ;; the ANSI spec, but the CMU CL &MORE extension does not
309 (aver (not morep)))))
311 (defmacro defmethod (&rest args)
312 (multiple-value-bind (name qualifiers lambda-list body)
313 (parse-defmethod args)
315 ;; KLUDGE: this double expansion is quite a monumental
316 ;; workaround: it comes about because of a fantastic interaction
317 ;; between the processing rules of CLHS 3.2.3.1 and the
318 ;; bizarreness of MAKE-METHOD-LAMBDA.
320 ;; MAKE-METHOD-LAMBDA can be called by the user, and if the
321 ;; lambda itself doesn't refer to outside bindings the return
322 ;; value must be compileable in the null lexical environment.
323 ;; However, the function must also refer somehow to the
324 ;; associated method object, so that it can call NO-NEXT-METHOD
325 ;; with the appropriate arguments if there is no next method --
326 ;; but when the function is generated, the method object doesn't
329 ;; In order to resolve this issue, we insert a literal cons cell
330 ;; into the body of the method lambda, return the same cons cell
331 ;; as part of the second (initargs) return value of
332 ;; MAKE-METHOD-LAMBDA, and a method on INITIALIZE-INSTANCE fills
333 ;; in the cell when the method is created. However, this
334 ;; strategy depends on having a fresh cons cell for every method
335 ;; lambda, which (without the workaround below) is skewered by
336 ;; the processing in CLHS 3.2.3.1, which permits implementations
337 ;; to macroexpand the bodies of EVAL-WHEN forms with both
338 ;; :COMPILE-TOPLEVEL and :LOAD-TOPLEVEL only once. The
339 ;; expansion below forces the double expansion in those cases,
340 ;; while expanding only once in the common case.
341 (eval-when (:load-toplevel)
342 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body))
343 (eval-when (:execute)
344 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body)))))
346 (defmacro %defmethod-expander
347 (name qualifiers lambda-list body &environment env)
348 (multiple-value-bind (proto-gf proto-method)
349 (prototypes-for-make-method-lambda name)
350 (expand-defmethod name proto-gf proto-method qualifiers
351 lambda-list body env)))
354 (defun prototypes-for-make-method-lambda (name)
355 (if (not (eq *boot-state* 'complete))
357 (let ((gf? (and (fboundp name)
358 (gdefinition name))))
360 (not (generic-function-p gf?)))
361 (values (class-prototype (find-class 'standard-generic-function))
362 (class-prototype (find-class 'standard-method)))
364 (class-prototype (or (generic-function-method-class gf?)
365 (find-class 'standard-method))))))))
367 ;;; Take a name which is either a generic function name or a list specifying
368 ;;; a SETF generic function (like: (SETF <generic-function-name>)). Return
369 ;;; the prototype instance of the method-class for that generic function.
371 ;;; If there is no generic function by that name, this returns the
372 ;;; default value, the prototype instance of the class
373 ;;; STANDARD-METHOD. This default value is also returned if the spec
374 ;;; names an ordinary function or even a macro. In effect, this leaves
375 ;;; the signalling of the appropriate error until load time.
377 ;;; Note: During bootstrapping, this function is allowed to return NIL.
378 (defun method-prototype-for-gf (name)
379 (let ((gf? (and (fboundp name)
380 (gdefinition name))))
381 (cond ((neq *boot-state* 'complete) nil)
383 (not (generic-function-p gf?))) ; Someone else MIGHT
384 ; error at load time.
385 (class-prototype (find-class 'standard-method)))
387 (class-prototype (or (generic-function-method-class gf?)
388 (find-class 'standard-method)))))))
390 (defun expand-defmethod (name
397 (multiple-value-bind (method-lambda unspecialized-lambda-list specializers)
398 (add-method-declarations name qualifiers lambda-list body env)
399 (multiple-value-bind (method-function-lambda initargs)
400 (make-method-lambda proto-gf proto-method method-lambda env)
401 (let ((initargs-form (make-method-initargs-form
402 proto-gf proto-method method-function-lambda
404 (specializers-form (make-method-specializers-form
405 proto-gf proto-method specializers env)))
407 ;; Note: We could DECLAIM the ftype of the generic function
408 ;; here, since ANSI specifies that we create it if it does
409 ;; not exist. However, I chose not to, because I think it's
410 ;; more useful to support a style of programming where every
411 ;; generic function has an explicit DEFGENERIC and any typos
412 ;; in DEFMETHODs are warned about. Otherwise
414 ;; (DEFGENERIC FOO-BAR-BLETCH (X))
415 ;; (DEFMETHOD FOO-BAR-BLETCH ((X HASH-TABLE)) ..)
416 ;; (DEFMETHOD FOO-BRA-BLETCH ((X SIMPLE-VECTOR)) ..)
417 ;; (DEFMETHOD FOO-BAR-BLETCH ((X VECTOR)) ..)
418 ;; (DEFMETHOD FOO-BAR-BLETCH ((X ARRAY)) ..)
419 ;; (DEFMETHOD FOO-BAR-BLETCH ((X LIST)) ..)
421 ;; compiles without raising an error and runs without
422 ;; raising an error (since SIMPLE-VECTOR cases fall through
423 ;; to VECTOR) but still doesn't do what was intended. I hate
424 ;; that kind of bug (code which silently gives the wrong
425 ;; answer), so we don't do a DECLAIM here. -- WHN 20000229
426 ,(make-defmethod-form name qualifiers specializers-form
427 unspecialized-lambda-list
429 (class-name (class-of proto-method))
433 (defun interned-symbol-p (x)
434 (and (symbolp x) (symbol-package x)))
436 (defun make-defmethod-form
437 (name qualifiers specializers unspecialized-lambda-list
438 method-class-name initargs-form)
441 (if (and (interned-symbol-p (fun-name-block-name name))
442 (every #'interned-symbol-p qualifiers)
445 (and (eq (car s) 'eql)
447 (let ((sv (constant-form-value (cadr s))))
448 (or (interned-symbol-p sv)
451 (standard-char-p sv)))))
452 (interned-symbol-p s)))
454 (consp initargs-form)
455 (eq (car initargs-form) 'list*)
456 (memq (cadr initargs-form) '(:function))
457 (consp (setq fn (caddr initargs-form)))
458 (eq (car fn) 'function)
459 (consp (setq fn-lambda (cadr fn)))
460 (eq (car fn-lambda) 'lambda)
461 (bug "Really got here"))
462 (let* ((specls (mapcar (lambda (specl)
464 ;; CONSTANT-FORM-VALUE? What I
465 ;; kind of want to know, though,
466 ;; is what happens if we don't do
467 ;; this for some slow-method
468 ;; function because of a hairy
469 ;; lexenv -- is the only bad
470 ;; effect that the method
471 ;; function ends up unnamed? If
472 ;; so, couldn't we arrange to
474 `(,(car specl) ,(eval (cadr specl)))
477 (mname `(,(if (eq (cadr initargs-form) :function)
478 'slow-method 'fast-method)
479 ,name ,@qualifiers ,specls)))
481 (defun ,mname ,(cadr fn-lambda)
483 ,(make-defmethod-form-internal
484 name qualifiers `',specls
485 unspecialized-lambda-list method-class-name
486 `(list* ,(cadr initargs-form)
488 ,@(cdddr initargs-form)))))
489 (make-defmethod-form-internal
493 `(list ,@(mapcar (lambda (specializer)
494 (if (consp specializer)
495 ``(,',(car specializer)
496 ,,(cadr specializer))
499 unspecialized-lambda-list
503 (defun make-defmethod-form-internal
504 (name qualifiers specializers-form unspecialized-lambda-list
505 method-class-name initargs-form)
511 ',unspecialized-lambda-list
513 (sb-c:source-location)))
515 (defmacro make-method-function (method-lambda &environment env)
516 (multiple-value-bind (proto-gf proto-method)
517 (prototypes-for-make-method-lambda nil)
518 (multiple-value-bind (method-function-lambda initargs)
519 (make-method-lambda proto-gf proto-method method-lambda env)
520 (make-method-initargs-form proto-gf
522 method-function-lambda
526 (defun add-method-declarations (name qualifiers lambda-list body env)
527 (declare (ignore env))
528 (multiple-value-bind (parameters unspecialized-lambda-list specializers)
529 (parse-specialized-lambda-list lambda-list)
530 (multiple-value-bind (real-body declarations documentation)
532 (values `(lambda ,unspecialized-lambda-list
533 ,@(when documentation `(,documentation))
534 ;; (Old PCL code used a somewhat different style of
535 ;; list for %METHOD-NAME values. Our names use
536 ;; ,@QUALIFIERS instead of ,QUALIFIERS so that the
537 ;; method names look more like what you see in a
540 ;; FIXME: As of sbcl-0.7.0.6, code elsewhere, at
541 ;; least the code to set up named BLOCKs around the
542 ;; bodies of methods, depends on the function's base
543 ;; name being the first element of the %METHOD-NAME
544 ;; list. It would be good to remove this dependency,
545 ;; perhaps by building the BLOCK here, or by using
546 ;; another declaration (e.g. %BLOCK-NAME), so that
547 ;; our method debug names are free to have any format,
548 ;; e.g. (:METHOD PRINT-OBJECT :AROUND (CLOWN T)).
550 ;; Further, as of sbcl-0.7.9.10, the code to
551 ;; implement NO-NEXT-METHOD is coupled to the form of
552 ;; this declaration; see the definition of
553 ;; CALL-NO-NEXT-METHOD (and the passing of
554 ;; METHOD-NAME-DECLARATION arguments around the
555 ;; various CALL-NEXT-METHOD logic).
556 (declare (%method-name (,name
559 (declare (%method-lambda-list ,@lambda-list))
562 unspecialized-lambda-list specializers))))
564 (defun real-make-method-initargs-form (proto-gf proto-method
565 method-lambda initargs env)
566 (declare (ignore proto-gf proto-method))
567 (unless (and (consp method-lambda)
568 (eq (car method-lambda) 'lambda))
569 (error "The METHOD-LAMBDA argument to MAKE-METHOD-FUNCTION, ~S, ~
570 is not a lambda form."
572 (make-method-initargs-form-internal method-lambda initargs env))
574 (unless (fboundp 'make-method-initargs-form)
575 (setf (gdefinition 'make-method-initargs-form)
576 (symbol-function 'real-make-method-initargs-form)))
578 (defun real-make-method-lambda (proto-gf proto-method method-lambda env)
579 (declare (ignore proto-gf proto-method))
580 (unless (and (consp method-lambda) (eq (car method-lambda) 'lambda))
581 (error "The METHOD-LAMBDA argument to MAKE-METHOD-LAMBDA, ~S, ~
582 is not a lambda form."
584 (multiple-value-bind (real-body declarations documentation)
585 (parse-body (cddr method-lambda))
586 (let* ((name-decl (get-declaration '%method-name declarations))
587 (sll-decl (get-declaration '%method-lambda-list declarations))
588 (method-name (when (consp name-decl) (car name-decl)))
589 (generic-function-name (when method-name (car method-name)))
590 (specialized-lambda-list (or sll-decl (cadr method-lambda)))
591 ;; the method-cell is a way of communicating what method a
592 ;; method-function implements, for the purpose of
593 ;; NO-NEXT-METHOD. We need something that can be shared
594 ;; between function and initargs, but not something that
595 ;; will be coalesced as a constant (because we are naughty,
596 ;; oh yes) with the expansion of any other methods in the
597 ;; same file. -- CSR, 2007-05-30
598 (method-cell (list (make-symbol "METHOD-CELL"))))
599 (multiple-value-bind (parameters lambda-list specializers)
600 (parse-specialized-lambda-list specialized-lambda-list)
601 (let* ((required-parameters
602 (mapcar (lambda (r s) (declare (ignore s)) r)
605 (slots (mapcar #'list required-parameters))
609 ;; These declarations seem to be used by PCL to pass
610 ;; information to itself; when I tried to delete 'em
611 ;; ca. 0.6.10 it didn't work. I'm not sure how
612 ;; they work, but note the (VAR-DECLARATION '%CLASS ..)
613 ;; expression in CAN-OPTIMIZE-ACCESS1. -- WHN 2000-12-30
615 (mapcar (lambda (a s) (and (symbolp s)
620 ;; These TYPE declarations weren't in the original
621 ;; PCL code, but the Python compiler likes them a
622 ;; lot. (We're telling the compiler about our
623 ;; knowledge of specialized argument types so that
624 ;; it can avoid run-time type dispatch overhead,
625 ;; which can be a huge win for Python.)
627 ;; KLUDGE: when I tried moving these to
628 ;; ADD-METHOD-DECLARATIONS, things broke. No idea
629 ;; why. -- CSR, 2004-06-16
630 ,@(mapcar #'parameter-specializer-declaration-in-defmethod
634 ;; Remove the documentation string and insert the
635 ;; appropriate class declarations. The documentation
636 ;; string is removed to make it easy for us to insert
637 ;; new declarations later, they will just go after the
638 ;; CADR of the method lambda. The class declarations
639 ;; are inserted to communicate the class of the method's
640 ;; arguments to the code walk.
641 `(lambda ,lambda-list
642 ;; The default ignorability of method parameters
643 ;; doesn't seem to be specified by ANSI. PCL had
644 ;; them basically ignorable but was a little
645 ;; inconsistent. E.g. even though the two
646 ;; method definitions
647 ;; (DEFMETHOD FOO ((X T) (Y T)) "Z")
648 ;; (DEFMETHOD FOO ((X T) Y) "Z")
649 ;; are otherwise equivalent, PCL treated Y as
650 ;; ignorable in the first definition but not in the
651 ;; second definition. We make all required
652 ;; parameters ignorable as a way of systematizing
653 ;; the old PCL behavior. -- WHN 2000-11-24
654 (declare (ignorable ,@required-parameters))
657 (block ,(fun-name-block-name generic-function-name)
659 (constant-value-p (and (null (cdr real-body))
660 (constantp (car real-body))))
661 (constant-value (and constant-value-p
662 (constant-form-value (car real-body))))
663 (plist (and constant-value-p
664 (or (typep constant-value
665 '(or number character))
666 (and (symbolp constant-value)
667 (symbol-package constant-value)))
668 (list :constant-value constant-value)))
669 (applyp (dolist (p lambda-list nil)
670 (cond ((memq p '(&optional &rest &key))
675 (walked-lambda call-next-method-p closurep
676 next-method-p-p setq-p
678 (walk-method-lambda method-lambda
683 (multiple-value-bind (walked-lambda-body
685 walked-documentation)
686 (parse-body (cddr walked-lambda))
687 (declare (ignore walked-documentation))
688 (when (some #'cdr slots)
689 (multiple-value-bind (slot-name-lists call-list)
690 (slot-name-lists-from-slots slots calls)
692 `(,@(when slot-name-lists
693 `(:slot-name-lists ,slot-name-lists))
695 `(:call-list ,call-list))
697 (setq walked-lambda-body
698 `((pv-binding (,required-parameters
702 :slot-name-lists ',slot-name-lists
703 :call-list ',call-list)))
704 ,@walked-lambda-body)))))
705 (when (and (memq '&key lambda-list)
706 (not (memq '&allow-other-keys lambda-list)))
707 (let ((aux (memq '&aux lambda-list)))
708 (setq lambda-list (nconc (ldiff lambda-list aux)
709 (list '&allow-other-keys)
711 (values `(lambda (.method-args. .next-methods.)
712 (simple-lexical-method-functions
713 (,lambda-list .method-args. .next-methods.
716 :next-method-p-p ,next-method-p-p
718 :method-cell ,method-cell
721 ,@walked-declarations
723 (declare (disable-package-locks
724 %parameter-binding-modified))
725 (symbol-macrolet ((%parameter-binding-modified
726 ',@parameters-setqd))
727 (declare (enable-package-locks
728 %parameter-binding-modified))
729 ,@walked-lambda-body))))
730 `(,@(when call-next-method-p `(method-cell ,method-cell))
731 ,@(when plist `(plist ,plist))
732 ,@(when documentation `(:documentation ,documentation)))))))))))
734 (unless (fboundp 'make-method-lambda)
735 (setf (gdefinition 'make-method-lambda)
736 (symbol-function 'real-make-method-lambda)))
738 (defun real-make-method-specializers-form
739 (proto-gf proto-method specializer-names env)
740 (declare (ignore env proto-gf proto-method))
743 ((and (eq *boot-state* 'complete)
746 ((symbolp name) `(find-class ',name))
747 ((consp name) (ecase (car name)
748 ((eql) `(intern-eql-specializer ,(cadr name)))
749 ((class-eq) `(class-eq-specializer (find-class ',(cadr name))))
750 ((prototype) `(fixme))))
752 `(list ,@(mapcar #'parse specializer-names))))
754 (unless (fboundp 'make-method-specializers-form)
755 (setf (gdefinition 'make-method-specializers-form)
756 (symbol-function 'real-make-method-specializers-form)))
758 (defun real-parse-specializer-using-class (generic-function specializer)
759 (let ((result (specializer-from-type specializer)))
760 (if (specializerp result)
762 (error "~@<~S cannot be parsed as a specializer for ~S.~@:>"
763 specializer generic-function))))
765 (unless (fboundp 'parse-specializer-using-class)
766 (setf (gdefinition 'parse-specializer-using-class)
767 (symbol-function 'real-parse-specializer-using-class)))
769 (defun real-unparse-specializer-using-class (generic-function specializer)
770 (if (specializerp specializer)
771 ;; FIXME: this HANDLER-CASE is a bit of a hammer to crack a nut:
772 ;; the idea is that we want to unparse permissively, so that the
773 ;; lazy (or rather the "portable") specializer extender (who
774 ;; does not define methods on these new SBCL-specific MOP
775 ;; functions) can still subclass specializer and define methods
776 ;; without everything going wrong. Making it cleaner and
777 ;; clearer that that is what we are defending against would be
778 ;; nice. -- CSR, 2007-06-01
780 (let ((type (specializer-type specializer)))
781 (if (and (consp type) (eq (car type) 'class))
782 (let* ((class (cadr type))
783 (class-name (class-name class)))
784 (if (eq class (find-class class-name nil))
788 (error () specializer))
789 (error "~@<~S is not a legal specializer for ~S.~@:>"
790 specializer generic-function)))
792 (unless (fboundp 'unparse-specializer-using-class)
793 (setf (gdefinition 'unparse-specializer-using-class)
794 (symbol-function 'real-unparse-specializer-using-class)))
796 ;;; a helper function for creating Python-friendly type declarations
797 ;;; in DEFMETHOD forms
798 (defun parameter-specializer-declaration-in-defmethod (parameter specializer)
799 (cond ((and (consp specializer)
800 (eq (car specializer) 'eql))
801 ;; KLUDGE: ANSI, in its wisdom, says that
802 ;; EQL-SPECIALIZER-FORMs in EQL specializers are evaluated at
803 ;; DEFMETHOD expansion time. Thus, although one might think
805 ;; (DEFMETHOD FOO ((X PACKAGE)
808 ;; the PACKAGE and (EQL 12) forms are both parallel type
809 ;; names, they're not, as is made clear when you do
810 ;; (DEFMETHOD FOO ((X PACKAGE)
813 ;; where Y needs to be a symbol named "BAR", not some cons
814 ;; made by (CONS 'QUOTE 'BAR). I.e. when the
815 ;; EQL-SPECIALIZER-FORM is (EQL 'X), it requires an argument
816 ;; to be of type (EQL X). It'd be easy to transform one to
817 ;; the other, but it'd be somewhat messier to do so while
818 ;; ensuring that the EQL-SPECIALIZER-FORM is only EVAL'd
819 ;; once. (The new code wouldn't be messy, but it'd require a
820 ;; big transformation of the old code.) So instead we punt.
824 ;; KLUDGE: For some low-level implementation
825 ;; classes, perhaps because of some problems related
826 ;; to the incomplete integration of PCL into SBCL's
827 ;; type system, some specializer classes can't be
828 ;; declared as argument types. E.g.
829 ;; (DEFMETHOD FOO ((X SLOT-OBJECT))
830 ;; (DECLARE (TYPE SLOT-OBJECT X))
833 ;; (DEFSTRUCT BAR A B)
835 ;; perhaps because of the way that STRUCTURE-OBJECT
836 ;; inherits both from SLOT-OBJECT and from
837 ;; SB-KERNEL:INSTANCE. In an effort to sweep such
838 ;; problems under the rug, we exclude these problem
839 ;; cases by blacklisting them here. -- WHN 2001-01-19
840 (list 'slot-object #+nil (find-class 'slot-object)))
842 ((not (eq *boot-state* 'complete))
843 ;; KLUDGE: PCL, in its wisdom, sometimes calls methods with
844 ;; types which don't match their specializers. (Specifically,
845 ;; it calls ENSURE-CLASS-USING-CLASS (T NULL) with a non-NULL
846 ;; second argument.) Hopefully it only does this kind of
847 ;; weirdness when bootstrapping.. -- WHN 20000610
849 ((typep specializer 'eql-specializer)
850 `(type (eql ,(eql-specializer-object specializer)) ,parameter))
851 ((var-globally-special-p parameter)
852 ;; KLUDGE: Don't declare types for global special variables
853 ;; -- our rebinding magic for SETQ cases don't work right
856 ;; FIXME: It would be better to detect the SETQ earlier and
857 ;; skip declarations for specials only when needed, not
863 ;; Otherwise, we can usually make Python very happy.
865 ;; KLUDGE: Since INFO doesn't work right for class objects here,
866 ;; and they are valid specializers, see if the specializer is
867 ;; a named class, and use the name in that case -- otherwise
868 ;; the class instance is ok, since info will just return NIL, NIL.
870 ;; We still need to deal with the class case too, but at
871 ;; least #.(find-class 'integer) and integer as equivalent
872 ;; specializers with this.
873 (let* ((specializer-nameoid
874 (if (and (typep specializer 'class)
875 (let ((name (class-name specializer)))
876 (and name (symbolp name)
877 (eq specializer (find-class name nil)))))
878 (class-name specializer)
880 (kind (info :type :kind specializer-nameoid)))
882 (flet ((specializer-nameoid-class ()
883 (typecase specializer-nameoid
884 (symbol (find-class specializer-nameoid nil))
885 (class specializer-nameoid)
886 (class-eq-specializer
887 (specializer-class specializer-nameoid))
890 ((:primitive) `(type ,specializer-nameoid ,parameter))
892 (let ((class (specializer-nameoid-class)))
893 ;; CLASS can be null here if the user has
894 ;; erroneously tried to use a defined type as a
895 ;; specializer; it can be a non-BUILT-IN-CLASS if
896 ;; the user defines a type and calls (SETF
897 ;; FIND-CLASS) in a consistent way.
898 (when (and class (typep class 'built-in-class))
899 `(type ,specializer-nameoid ,parameter))))
901 (let ((class (specializer-nameoid-class)))
904 (if (typep class '(or built-in-class structure-class))
905 `(type ,class ,parameter)
906 ;; don't declare CLOS classes as parameters;
907 ;; it's too expensive.
910 ;; we can get here, and still not have a failure
911 ;; case, by doing MOP programming like (PROGN
912 ;; (ENSURE-CLASS 'FOO) (DEFMETHOD BAR ((X FOO))
913 ;; ...)). Best to let the user know we haven't
914 ;; been able to extract enough information:
916 "~@<can't find type for specializer ~S in ~S.~@:>"
918 'parameter-specializer-declaration-in-defmethod)
920 ((:forthcoming-defclass-type)
923 ;;; For passing a list (groveled by the walker) of the required
924 ;;; parameters whose bindings are modified in the method body to the
925 ;;; optimized-slot-value* macros.
926 (define-symbol-macro %parameter-binding-modified ())
928 (defmacro simple-lexical-method-functions ((lambda-list
934 ,method-args ,next-methods
935 (bind-simple-lexical-method-functions (,method-args ,next-methods
937 (bind-args (,lambda-list ,method-args)
940 (defmacro fast-lexical-method-functions ((lambda-list
946 `(bind-fast-lexical-method-functions (,args ,rest-arg ,next-method-call ,lmf-options)
947 (bind-args (,(nthcdr (length args) lambda-list) ,rest-arg)
950 (defmacro bind-simple-lexical-method-functions
951 ((method-args next-methods (&key call-next-method-p next-method-p-p setq-p
952 closurep applyp method-cell))
955 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
958 `(let ((.next-method. (car ,next-methods))
959 (,next-methods (cdr ,next-methods)))
960 (declare (ignorable .next-method. ,next-methods))
961 (flet (,@(and call-next-method-p
964 ,@(if (safe-code-p env)
965 `((%check-cnm-args cnm-args
970 (funcall (if (std-instance-p .next-method.)
971 (method-function .next-method.)
972 .next-method.) ; for early methods
973 (or cnm-args ,method-args)
975 (apply #'call-no-next-method
977 (or cnm-args ,method-args))))))
978 ,@(and next-method-p-p
980 (not (null .next-method.))))))
983 (defun call-no-next-method (method-cell &rest args)
984 (let ((method (car method-cell)))
986 (apply #'no-next-method (method-generic-function method)
989 (defstruct (method-call (:copier nil))
990 (function #'identity :type function)
992 (defstruct (constant-method-call (:copier nil) (:include method-call))
995 #-sb-fluid (declaim (sb-ext:freeze-type method-call))
997 (defmacro invoke-method-call1 (function args cm-args)
998 `(let ((.function. ,function)
1000 (.cm-args. ,cm-args))
1001 (if (and .cm-args. (null (cdr .cm-args.)))
1002 (funcall .function. .args. (car .cm-args.))
1003 (apply .function. .args. .cm-args.))))
1005 (defmacro invoke-method-call (method-call restp &rest required-args+rest-arg)
1006 `(invoke-method-call1 (method-call-function ,method-call)
1008 `(list* ,@required-args+rest-arg)
1009 `(list ,@required-args+rest-arg))
1010 (method-call-call-method-args ,method-call)))
1012 (defstruct (fast-method-call (:copier nil))
1013 (function #'identity :type function)
1017 (defstruct (constant-fast-method-call
1018 (:copier nil) (:include fast-method-call))
1021 #-sb-fluid (declaim (sb-ext:freeze-type fast-method-call))
1023 ;; The two variants of INVOKE-FAST-METHOD-CALL differ in how REST-ARGs
1024 ;; are handled. The first one will get REST-ARG as a single list (as
1025 ;; the last argument), and will thus need to use APPLY. The second one
1026 ;; will get them as a &MORE argument, so we can pass the arguments
1027 ;; directly with MULTIPLE-VALUE-CALL and %MORE-ARG-VALUES.
1029 (defmacro invoke-fast-method-call (method-call restp &rest required-args+rest-arg)
1030 `(,(if restp 'apply 'funcall) (fast-method-call-function ,method-call)
1031 (fast-method-call-pv-cell ,method-call)
1032 (fast-method-call-next-method-call ,method-call)
1033 ,@required-args+rest-arg))
1035 (defmacro invoke-fast-method-call/more (method-call
1038 &rest required-args)
1039 (macrolet ((generate-call (n)
1040 ``(funcall (fast-method-call-function ,method-call)
1041 (fast-method-call-pv-cell ,method-call)
1042 (fast-method-call-next-method-call ,method-call)
1044 ,@(loop for x below ,n
1045 collect `(sb-c::%more-arg ,more-context ,x)))))
1046 ;; The cases with only small amounts of required arguments passed
1047 ;; are probably very common, and special-casing speeds them up by
1048 ;; a factor of 2 with very little effect on the other
1049 ;; cases. Though it'd be nice to have the generic case be equally
1052 (0 ,(generate-call 0))
1053 (1 ,(generate-call 1))
1054 (t (multiple-value-call (fast-method-call-function ,method-call)
1055 (values (fast-method-call-pv-cell ,method-call))
1056 (values (fast-method-call-next-method-call ,method-call))
1058 (sb-c::%more-arg-values ,more-context 0 ,more-count))))))
1060 (defstruct (fast-instance-boundp (:copier nil))
1061 (index 0 :type fixnum))
1063 #-sb-fluid (declaim (sb-ext:freeze-type fast-instance-boundp))
1065 (eval-when (:compile-toplevel :load-toplevel :execute)
1066 (defvar *allow-emf-call-tracing-p* nil)
1067 (defvar *enable-emf-call-tracing-p* #-sb-show nil #+sb-show t))
1069 ;;;; effective method functions
1071 (defvar *emf-call-trace-size* 200)
1072 (defvar *emf-call-trace* nil)
1073 (defvar *emf-call-trace-index* 0)
1075 ;;; This function was in the CMU CL version of PCL (ca Debian 2.4.8)
1076 ;;; without explanation. It appears to be intended for debugging, so
1077 ;;; it might be useful someday, so I haven't deleted it.
1078 ;;; But it isn't documented and isn't used for anything now, so
1079 ;;; I've conditionalized it out of the base system. -- WHN 19991213
1081 (defun show-emf-call-trace ()
1082 (when *emf-call-trace*
1083 (let ((j *emf-call-trace-index*)
1084 (*enable-emf-call-tracing-p* nil))
1085 (format t "~&(The oldest entries are printed first)~%")
1086 (dotimes-fixnum (i *emf-call-trace-size*)
1087 (let ((ct (aref *emf-call-trace* j)))
1088 (when ct (print ct)))
1090 (when (= j *emf-call-trace-size*)
1093 (defun trace-emf-call-internal (emf format args)
1094 (unless *emf-call-trace*
1095 (setq *emf-call-trace* (make-array *emf-call-trace-size*)))
1096 (setf (aref *emf-call-trace* *emf-call-trace-index*)
1097 (list* emf format args))
1098 (incf *emf-call-trace-index*)
1099 (when (= *emf-call-trace-index* *emf-call-trace-size*)
1100 (setq *emf-call-trace-index* 0)))
1102 (defmacro trace-emf-call (emf format args)
1103 (when *allow-emf-call-tracing-p*
1104 `(when *enable-emf-call-tracing-p*
1105 (trace-emf-call-internal ,emf ,format ,args))))
1107 (defmacro invoke-effective-method-function-fast
1108 (emf restp &key required-args rest-arg more-arg)
1110 (trace-emf-call ,emf ,restp (list ,@required-args rest-arg))
1112 `(invoke-fast-method-call/more ,emf
1115 `(invoke-fast-method-call ,emf
1120 (defun effective-method-optimized-slot-access-clause
1121 (emf restp required-args)
1122 ;; "What," you may wonder, "do these next two clauses do?" In that
1123 ;; case, you are not a PCL implementor, for they considered this to
1124 ;; be self-documenting.:-| Or CSR, for that matter, since he can
1125 ;; also figure it out by looking at it without breaking stride. For
1126 ;; the rest of us, though: From what the code is doing with .SLOTS.
1127 ;; and whatnot, evidently it's implementing SLOT-VALUEish and
1128 ;; GET-SLOT-VALUEish things. Then we can reason backwards and
1129 ;; conclude that setting EMF to a FIXNUM is an optimized way to
1130 ;; represent these slot access operations.
1132 (let ((length (length required-args)))
1135 (let* ((.slots. (get-slots-or-nil
1136 ,(car required-args)))
1137 (value (when .slots. (clos-slots-ref .slots. ,emf))))
1138 (if (eq value +slot-unbound+)
1139 (slot-unbound-internal ,(car required-args)
1144 (let ((.new-value. ,(car required-args))
1145 (.slots. (get-slots-or-nil
1146 ,(cadr required-args))))
1148 (setf (clos-slots-ref .slots. ,emf) .new-value.)))))))
1149 ;; (In cmucl-2.4.8 there was a commented-out third ,@(WHEN
1150 ;; ...) clause here to handle SLOT-BOUNDish stuff. Since
1151 ;; there was no explanation and presumably the code is 10+
1152 ;; years stale, I simply deleted it. -- WHN)
1155 ;;; Before SBCL 0.9.16.7 instead of
1156 ;;; INVOKE-NARROW-EFFECTIVE-METHOD-FUNCTION we passed a (THE (OR
1157 ;;; FUNCTION METHOD-CALL FAST-METHOD-CALL) EMF) form as the EMF. Now,
1158 ;;; to make less work for the compiler we take a path that doesn't
1159 ;;; involve the slot-accessor clause (where EMF is a FIXNUM) at all.
1160 (macrolet ((def (name &optional narrow)
1161 `(defmacro ,name (emf restp &key required-args rest-arg more-arg)
1162 (unless (constantp restp)
1163 (error "The RESTP argument is not constant."))
1164 (setq restp (constant-form-value restp))
1165 (with-unique-names (emf-n)
1167 (declare (optimize (sb-c:insert-step-conditions 0)))
1168 (let ((,emf-n ,emf))
1169 (trace-emf-call ,emf-n ,restp (list ,@required-args ,@rest-arg))
1173 `(invoke-fast-method-call/more ,emf-n
1176 `(invoke-fast-method-call ,emf-n
1181 `(effective-method-optimized-slot-access-clause
1182 emf-n restp required-args))
1184 (invoke-method-call ,emf-n ,restp ,@required-args
1188 `(apply ,emf-n ,@required-args ,@rest-arg)
1189 `(funcall ,emf-n ,@required-args
1190 ,@rest-arg))))))))))
1191 (def invoke-effective-method-function nil)
1192 (def invoke-narrow-effective-method-function t))
1194 (defun invoke-emf (emf args)
1195 (trace-emf-call emf t args)
1198 (let* ((arg-info (fast-method-call-arg-info emf))
1199 (restp (cdr arg-info))
1200 (nreq (car arg-info)))
1202 (apply (fast-method-call-function emf)
1203 (fast-method-call-pv-cell emf)
1204 (fast-method-call-next-method-call emf)
1208 (invoke-fast-method-call emf nil)
1209 (error 'simple-program-error
1210 :format-control "invalid number of arguments: 0"
1211 :format-arguments nil)))
1214 (invoke-fast-method-call emf nil (car args))
1215 (error 'simple-program-error
1216 :format-control "invalid number of arguments: 1"
1217 :format-arguments nil)))
1220 (invoke-fast-method-call emf nil (car args) (cadr args))
1221 (error 'simple-program-error
1222 :format-control "invalid number of arguments: 2"
1223 :format-arguments nil)))
1225 (apply (fast-method-call-function emf)
1226 (fast-method-call-pv-cell emf)
1227 (fast-method-call-next-method-call emf)
1230 (apply (method-call-function emf)
1232 (method-call-call-method-args emf)))
1235 (error 'simple-program-error
1236 :format-control "invalid number of arguments: 0"
1237 :format-arguments nil))
1239 (let* ((slots (get-slots (car args)))
1240 (value (clos-slots-ref slots emf)))
1241 (if (eq value +slot-unbound+)
1242 (slot-unbound-internal (car args) emf)
1245 (setf (clos-slots-ref (get-slots (cadr args)) emf)
1247 (t (error 'simple-program-error
1248 :format-control "invalid number of arguments"
1249 :format-arguments nil))))
1250 (fast-instance-boundp
1251 (if (or (null args) (cdr args))
1252 (error 'simple-program-error
1253 :format-control "invalid number of arguments"
1254 :format-arguments nil)
1255 (let ((slots (get-slots (car args))))
1256 (not (eq (clos-slots-ref slots (fast-instance-boundp-index emf))
1262 (defmacro fast-call-next-method-body ((args next-method-call rest-arg)
1265 `(if ,next-method-call
1266 ,(let ((call `(invoke-narrow-effective-method-function
1268 ,(not (null rest-arg))
1269 :required-args ,args
1270 :rest-arg ,(when rest-arg (list rest-arg)))))
1274 `(&rest ,rest-arg)))
1278 (call-no-next-method ',method-cell
1283 (defmacro bind-fast-lexical-method-functions
1284 ((args rest-arg next-method-call (&key
1293 (let* ((all-params (append args (when rest-arg (list rest-arg))))
1294 (rebindings (when (or setq-p call-next-method-p)
1295 (mapcar (lambda (x) (list x x)) all-params))))
1296 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
1299 `(flet (,@(when call-next-method-p
1300 `((call-next-method (&rest cnm-args)
1301 (declare (muffle-conditions code-deletion-note)
1302 (optimize (sb-c:insert-step-conditions 0)))
1303 ,@(if (safe-code-p env)
1304 `((%check-cnm-args cnm-args (list ,@args)
1307 (fast-call-next-method-body (,args
1312 ,@(when next-method-p-p
1314 (declare (optimize (sb-c:insert-step-conditions 0)))
1315 (not (null ,next-method-call))))))
1317 ,@(when rebindings `((declare (ignorable ,@all-params))))
1320 ;;; CMUCL comment (Gerd Moellmann):
1322 ;;; The standard says it's an error if CALL-NEXT-METHOD is called with
1323 ;;; arguments, and the set of methods applicable to those arguments is
1324 ;;; different from the set of methods applicable to the original
1325 ;;; method arguments. (According to Barry Margolin, this rule was
1326 ;;; probably added to ensure that before and around methods are always
1327 ;;; run before primary methods.)
1329 ;;; This could be optimized for the case that the generic function
1330 ;;; doesn't have hairy methods, does have standard method combination,
1331 ;;; is a standard generic function, there are no methods defined on it
1332 ;;; for COMPUTE-APPLICABLE-METHODS and probably a lot more of such
1333 ;;; preconditions. That looks hairy and is probably not worth it,
1334 ;;; because this check will never be fast.
1335 (defun %check-cnm-args (cnm-args orig-args method-cell)
1337 (let* ((gf (method-generic-function (car method-cell)))
1338 (omethods (compute-applicable-methods gf orig-args))
1339 (nmethods (compute-applicable-methods gf cnm-args)))
1340 (unless (equal omethods nmethods)
1341 (error "~@<The set of methods ~S applicable to argument~P ~
1342 ~{~S~^, ~} to call-next-method is different from ~
1343 the set of methods ~S applicable to the original ~
1344 method argument~P ~{~S~^, ~}.~@:>"
1345 nmethods (length cnm-args) cnm-args omethods
1346 (length orig-args) orig-args)))))
1348 (defmacro bind-args ((lambda-list args) &body body)
1349 (let ((args-tail '.args-tail.)
1352 (flet ((process-var (var)
1353 (if (memq var lambda-list-keywords)
1356 (&optional (setq state 'optional))
1357 (&key (setq state 'key))
1359 (&rest (setq state 'rest))
1360 (&aux (setq state 'aux))
1363 "encountered the non-standard lambda list keyword ~S"
1367 (required `((,var (pop ,args-tail))))
1368 (optional (cond ((not (consp var))
1369 `((,var (when ,args-tail
1370 (pop ,args-tail)))))
1372 `((,(car var) (if ,args-tail
1376 `((,(caddr var) (not (null ,args-tail)))
1377 (,(car var) (if ,args-tail
1380 (rest `((,var ,args-tail)))
1381 (key (cond ((not (consp var))
1383 (get-key-arg-tail ,(keywordicate var)
1386 (multiple-value-bind (keyword variable)
1387 (if (consp (car var))
1390 (values (keywordicate (car var))
1392 `((,key (get-key-arg-tail ',keyword
1398 (multiple-value-bind (keyword variable)
1399 (if (consp (car var))
1402 (values (keywordicate (car var))
1404 `((,key (get-key-arg-tail ',keyword
1406 (,(caddr var) (not (null,key)))
1411 (let ((bindings (mapcan #'process-var lambda-list)))
1412 `(let* ((,args-tail ,args)
1415 ,@(when (eq state 'optional)
1416 `((unless (null ,args-tail)
1417 (error 'simple-program-error
1418 :format-control "surplus arguments: ~S"
1419 :format-arguments (list ,args-tail)))))))
1420 (declare (ignorable ,args-tail .dummy0.))
1423 (defun get-key-arg-tail (keyword list)
1424 (loop for (key . tail) on list by #'cddr
1426 ;; FIXME: Do we want to export this symbol? Or maybe use an
1427 ;; (ERROR 'SIMPLE-PROGRAM-ERROR) form?
1428 (sb-c::%odd-key-args-error)
1429 when (eq key keyword)
1432 (defun walk-method-lambda (method-lambda required-parameters env slots calls)
1433 (let (;; flag indicating that CALL-NEXT-METHOD should be in the
1434 ;; method definition
1435 (call-next-method-p nil)
1436 ;; flag indicating that #'CALL-NEXT-METHOD was seen in the
1439 ;; flag indicating that NEXT-METHOD-P should be in the method
1441 (next-method-p-p nil)
1442 ;; a list of all required parameters whose bindings might be
1443 ;; modified in the method body.
1444 (parameters-setqd nil))
1445 (flet ((walk-function (form context env)
1446 (cond ((not (eq context :eval)) form)
1447 ;; FIXME: Jumping to a conclusion from the way it's used
1448 ;; above, perhaps CONTEXT should be called SITUATION
1449 ;; (after the term used in the ANSI specification of
1450 ;; EVAL-WHEN) and given modern ANSI keyword values
1451 ;; like :LOAD-TOPLEVEL.
1452 ((not (listp form)) form)
1453 ((eq (car form) 'call-next-method)
1454 (setq call-next-method-p t)
1456 ((eq (car form) 'next-method-p)
1457 (setq next-method-p-p t)
1459 ((memq (car form) '(setq multiple-value-setq))
1460 ;; FIXME: this is possibly a little strong as
1461 ;; conditions go. Ideally we would want to detect
1462 ;; which, if any, of the method parameters are
1463 ;; being set, and communicate that information to
1464 ;; e.g. SPLIT-DECLARATIONS. However, the brute
1465 ;; force method doesn't really cost much; a little
1466 ;; loss of discrimination over IGNORED variables
1467 ;; should be all. -- CSR, 2004-07-01
1469 ;; As of 2006-09-18 modified parameter bindings
1470 ;; are now tracked with more granularity than just
1471 ;; one SETQ-P flag, in order to disable SLOT-VALUE
1472 ;; optimizations for parameters that are SETQd.
1473 ;; The old binary SETQ-P flag is still used for
1474 ;; all other purposes, since as noted above, the
1475 ;; extra cost is minimal. -- JES, 2006-09-18
1477 ;; The walker will split (SETQ A 1 B 2) to
1478 ;; separate (SETQ A 1) and (SETQ B 2) forms, so we
1479 ;; only need to handle the simple case of SETQ
1481 (let ((vars (if (eq (car form) 'setq)
1482 (list (second form))
1485 ;; Note that we don't need to check for
1486 ;; %VARIABLE-REBINDING declarations like is
1487 ;; done in CAN-OPTIMIZE-ACCESS1, since the
1488 ;; bindings that will have that declation will
1490 (when (var-declaration '%class var env)
1491 ;; If a parameter binding is shadowed by
1492 ;; another binding it won't have a %CLASS
1493 ;; declaration anymore, and this won't get
1495 (pushnew var parameters-setqd))))
1497 ((and (eq (car form) 'function)
1498 (cond ((eq (cadr form) 'call-next-method)
1499 (setq call-next-method-p t)
1502 ((eq (cadr form) 'next-method-p)
1503 (setq next-method-p-p t)
1507 ((and (memq (car form)
1508 '(slot-value set-slot-value slot-boundp))
1509 (constantp (caddr form)))
1510 (let ((parameter (can-optimize-access form
1513 (let ((fun (ecase (car form)
1514 (slot-value #'optimize-slot-value)
1515 (set-slot-value #'optimize-set-slot-value)
1516 (slot-boundp #'optimize-slot-boundp))))
1517 (funcall fun slots parameter form))))
1520 (let ((walked-lambda (walk-form method-lambda env #'walk-function)))
1521 ;;; FIXME: the walker's rewriting of the source code causes
1522 ;;; trouble when doing code coverage. The rewrites should be
1523 ;;; removed, and the same operations done using
1524 ;;; compiler-macros or tranforms.
1525 (values (if (sb-c:policy env (= sb-c:store-coverage-data 0))
1531 (not (null parameters-setqd))
1532 parameters-setqd)))))
1534 (defun generic-function-name-p (name)
1535 (and (legal-fun-name-p name)
1537 (if (eq *boot-state* 'complete)
1538 (standard-generic-function-p (gdefinition name))
1539 (funcallable-instance-p (gdefinition name)))))
1541 (defun method-plist-value (method key &optional default)
1542 (let ((plist (if (consp method)
1543 (getf (early-method-initargs method) 'plist)
1544 (object-plist method))))
1545 (getf plist key default)))
1547 (defun (setf method-plist-value) (new-value method key &optional default)
1549 (setf (getf (getf (early-method-initargs method) 'plist) key default)
1551 (setf (getf (object-plist method) key default) new-value)))
1553 (defun load-defmethod (class name quals specls ll initargs source-location)
1554 (let ((method-cell (getf initargs 'method-cell)))
1555 (setq initargs (copy-tree initargs))
1557 (setf (getf initargs 'method-cell) method-cell))
1559 (setf (getf (getf initargs 'plist) :name)
1560 (make-method-spec name quals specls))
1561 (load-defmethod-internal class name quals specls
1562 ll initargs source-location)))
1564 (defun load-defmethod-internal
1565 (method-class gf-spec qualifiers specializers lambda-list
1566 initargs source-location)
1567 (when (and (eq *boot-state* 'complete)
1569 (let* ((gf (fdefinition gf-spec))
1570 (method (and (generic-function-p gf)
1571 (generic-function-methods gf)
1572 (find-method gf qualifiers specializers nil))))
1574 (style-warn "redefining ~S~{ ~S~} ~S in DEFMETHOD"
1575 gf-spec qualifiers specializers))))
1576 (let ((method (apply #'add-named-method
1577 gf-spec qualifiers specializers lambda-list
1578 :definition-source source-location
1580 (unless (or (eq method-class 'standard-method)
1581 (eq (find-class method-class nil) (class-of method)))
1582 ;; FIXME: should be STYLE-WARNING?
1583 (format *error-output*
1584 "~&At the time the method with qualifiers ~:S and~%~
1585 specializers ~:S on the generic function ~S~%~
1586 was compiled, the method-class for that generic function was~%~
1587 ~S. But, the method class is now ~S, this~%~
1588 may mean that this method was compiled improperly.~%"
1589 qualifiers specializers gf-spec
1590 method-class (class-name (class-of method))))
1593 (defun make-method-spec (gf qualifiers specializers)
1594 (let ((name (generic-function-name gf))
1595 (unparsed-specializers (unparse-specializers gf specializers)))
1596 `(slow-method ,name ,@qualifiers ,unparsed-specializers)))
1598 (defun initialize-method-function (initargs method)
1599 (let* ((mf (getf initargs :function))
1600 (mff (and (typep mf '%method-function)
1601 (%method-function-fast-function mf)))
1602 (plist (getf initargs 'plist))
1603 (name (getf plist :name))
1604 (method-cell (getf initargs 'method-cell)))
1606 (setf (car method-cell) method))
1609 (setq mf (set-fun-name mf name)))
1610 (when (and mff (consp name) (eq (car name) 'slow-method))
1611 (let ((fast-name `(fast-method ,@(cdr name))))
1612 (set-fun-name mff fast-name))))
1614 (let ((plist plist))
1615 (let ((snl (getf plist :slot-name-lists))
1616 (cl (getf plist :call-list)))
1618 (setf (method-plist-value method :pv-table)
1619 (intern-pv-table :slot-name-lists snl :call-list cl))))))))
1621 (defun analyze-lambda-list (lambda-list)
1622 (flet (;; FIXME: Is this redundant with SB-C::MAKE-KEYWORD-FOR-ARG?
1623 (parse-key-arg (arg)
1625 (if (listp (car arg))
1627 (keywordicate (car arg)))
1628 (keywordicate arg))))
1634 (allow-other-keys-p nil)
1636 (keyword-parameters ())
1638 (dolist (x lambda-list)
1639 (if (memq x lambda-list-keywords)
1641 (&optional (setq state 'optional))
1644 (&allow-other-keys (setq allow-other-keys-p t))
1645 (&rest (setq restp t
1649 (error "encountered the non-standard lambda list keyword ~S"
1652 (required (incf nrequired))
1653 (optional (incf noptional))
1654 (key (push (parse-key-arg x) keywords)
1655 (push x keyword-parameters))
1656 (rest (incf nrest)))))
1657 (when (and restp (zerop nrest))
1658 (error "Error in lambda-list:~%~
1659 After &REST, a DEFGENERIC lambda-list ~
1660 must be followed by at least one variable."))
1661 (values nrequired noptional keysp restp allow-other-keys-p
1663 (reverse keyword-parameters)))))
1665 (defun keyword-spec-name (x)
1666 (let ((key (if (atom x) x (car x))))
1671 (defun ftype-declaration-from-lambda-list (lambda-list name)
1672 (multiple-value-bind (nrequired noptional keysp restp allow-other-keys-p
1673 keywords keyword-parameters)
1674 (analyze-lambda-list lambda-list)
1675 (declare (ignore keyword-parameters))
1676 (let* ((old (info :function :type name)) ;FIXME:FDOCUMENTATION instead?
1677 (old-ftype (if (fun-type-p old) old nil))
1678 (old-restp (and old-ftype (fun-type-rest old-ftype)))
1679 (old-keys (and old-ftype
1680 (mapcar #'key-info-name
1683 (old-keysp (and old-ftype (fun-type-keyp old-ftype)))
1684 (old-allowp (and old-ftype
1685 (fun-type-allowp old-ftype)))
1686 (keywords (union old-keys (mapcar #'keyword-spec-name keywords))))
1687 `(function ,(append (make-list nrequired :initial-element t)
1688 (when (plusp noptional)
1689 (append '(&optional)
1690 (make-list noptional :initial-element t)))
1691 (when (or restp old-restp)
1693 (when (or keysp old-keysp)
1695 (mapcar (lambda (key)
1698 (when (or allow-other-keys-p old-allowp)
1699 '(&allow-other-keys)))))
1702 (defun defgeneric-declaration (spec lambda-list)
1703 `(ftype ,(ftype-declaration-from-lambda-list lambda-list spec) ,spec))
1705 ;;;; early generic function support
1707 (defvar *!early-generic-functions* ())
1709 (defun ensure-generic-function (fun-name
1711 &key environment source-location
1713 (declare (ignore environment))
1714 (let ((existing (and (fboundp fun-name)
1715 (gdefinition fun-name))))
1716 (cond ((and existing
1717 (eq *boot-state* 'complete)
1718 (null (generic-function-p existing)))
1719 (generic-clobbers-function fun-name)
1720 (fmakunbound fun-name)
1721 (apply #'ensure-generic-function fun-name all-keys))
1723 (apply #'ensure-generic-function-using-class
1724 existing fun-name all-keys)))))
1726 (defun generic-clobbers-function (fun-name)
1727 (cerror "Replace the function binding"
1728 'simple-program-error
1729 :format-control "~S already names an ordinary function or a macro."
1730 :format-arguments (list fun-name)))
1732 (defvar *sgf-wrapper*
1733 (boot-make-wrapper (early-class-size 'standard-generic-function)
1734 'standard-generic-function))
1736 (defvar *sgf-slots-init*
1737 (mapcar (lambda (canonical-slot)
1738 (if (memq (getf canonical-slot :name) '(arg-info source))
1740 (let ((initfunction (getf canonical-slot :initfunction)))
1742 (funcall initfunction)
1744 (early-collect-inheritance 'standard-generic-function)))
1746 (defvar *sgf-method-class-index*
1747 (!bootstrap-slot-index 'standard-generic-function 'method-class))
1749 (defun early-gf-p (x)
1750 (and (fsc-instance-p x)
1751 (eq (clos-slots-ref (get-slots x) *sgf-method-class-index*)
1754 (defvar *sgf-methods-index*
1755 (!bootstrap-slot-index 'standard-generic-function 'methods))
1757 (defmacro early-gf-methods (gf)
1758 `(clos-slots-ref (get-slots ,gf) *sgf-methods-index*))
1760 (defun safe-generic-function-methods (generic-function)
1761 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
1762 (clos-slots-ref (get-slots generic-function) *sgf-methods-index*)
1763 (generic-function-methods generic-function)))
1765 (defvar *sgf-arg-info-index*
1766 (!bootstrap-slot-index 'standard-generic-function 'arg-info))
1768 (defmacro early-gf-arg-info (gf)
1769 `(clos-slots-ref (get-slots ,gf) *sgf-arg-info-index*))
1771 (defvar *sgf-dfun-state-index*
1772 (!bootstrap-slot-index 'standard-generic-function 'dfun-state))
1774 (defstruct (arg-info
1776 (:constructor make-arg-info ())
1778 (arg-info-lambda-list :no-lambda-list)
1781 arg-info-number-optional
1783 arg-info-keys ;nil no &KEY or &REST allowed
1784 ;(k1 k2 ..) Each method must accept these &KEY arguments.
1785 ;T must have &KEY or &REST
1787 gf-info-simple-accessor-type ; nil, reader, writer, boundp
1788 (gf-precompute-dfun-and-emf-p nil) ; set by set-arg-info
1790 gf-info-static-c-a-m-emf
1791 (gf-info-c-a-m-emf-std-p t)
1794 #-sb-fluid (declaim (sb-ext:freeze-type arg-info))
1796 (defun arg-info-valid-p (arg-info)
1797 (not (null (arg-info-number-optional arg-info))))
1799 (defun arg-info-applyp (arg-info)
1800 (or (plusp (arg-info-number-optional arg-info))
1801 (arg-info-key/rest-p arg-info)))
1803 (defun arg-info-number-required (arg-info)
1804 (length (arg-info-metatypes arg-info)))
1806 (defun arg-info-nkeys (arg-info)
1807 (count-if (lambda (x) (neq x t)) (arg-info-metatypes arg-info)))
1809 (defun create-gf-lambda-list (lambda-list)
1810 ;;; Create a gf lambda list from a method lambda list
1811 (loop for x in lambda-list
1812 collect (if (consp x) (list (car x)) x)
1813 if (eq x '&key) do (loop-finish)))
1815 (defun set-arg-info (gf &key new-method (lambda-list nil lambda-list-p)
1816 argument-precedence-order)
1817 (let* ((arg-info (if (eq *boot-state* 'complete)
1819 (early-gf-arg-info gf)))
1820 (methods (if (eq *boot-state* 'complete)
1821 (generic-function-methods gf)
1822 (early-gf-methods gf)))
1823 (was-valid-p (integerp (arg-info-number-optional arg-info)))
1824 (first-p (and new-method (null (cdr methods)))))
1825 (when (and (not lambda-list-p) methods)
1826 (setq lambda-list (gf-lambda-list gf)))
1827 (when (or lambda-list-p
1829 (eq (arg-info-lambda-list arg-info) :no-lambda-list)))
1830 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1831 (analyze-lambda-list lambda-list)
1832 (when (and methods (not first-p))
1833 (let ((gf-nreq (arg-info-number-required arg-info))
1834 (gf-nopt (arg-info-number-optional arg-info))
1835 (gf-key/rest-p (arg-info-key/rest-p arg-info)))
1836 (unless (and (= nreq gf-nreq)
1838 (eq (or keysp restp) gf-key/rest-p))
1839 (error "The lambda-list ~S is incompatible with ~
1840 existing methods of ~S."
1842 (setf (arg-info-lambda-list arg-info)
1845 (create-gf-lambda-list lambda-list)))
1846 (when (or lambda-list-p argument-precedence-order
1847 (null (arg-info-precedence arg-info)))
1848 (setf (arg-info-precedence arg-info)
1849 (compute-precedence lambda-list nreq argument-precedence-order)))
1850 (setf (arg-info-metatypes arg-info) (make-list nreq))
1851 (setf (arg-info-number-optional arg-info) nopt)
1852 (setf (arg-info-key/rest-p arg-info) (not (null (or keysp restp))))
1853 (setf (arg-info-keys arg-info)
1855 (if allow-other-keys-p t keywords)
1856 (arg-info-key/rest-p arg-info)))))
1858 (check-method-arg-info gf arg-info new-method))
1859 (set-arg-info1 gf arg-info new-method methods was-valid-p first-p)
1862 (defun check-method-arg-info (gf arg-info method)
1863 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1864 (analyze-lambda-list (if (consp method)
1865 (early-method-lambda-list method)
1866 (method-lambda-list method)))
1867 (flet ((lose (string &rest args)
1868 (error 'simple-program-error
1869 :format-control "~@<attempt to add the method~2I~_~S~I~_~
1870 to the generic function~2I~_~S;~I~_~
1872 :format-arguments (list method gf string args)))
1873 (comparison-description (x y)
1874 (if (> x y) "more" "fewer")))
1875 (let ((gf-nreq (arg-info-number-required arg-info))
1876 (gf-nopt (arg-info-number-optional arg-info))
1877 (gf-key/rest-p (arg-info-key/rest-p arg-info))
1878 (gf-keywords (arg-info-keys arg-info)))
1879 (unless (= nreq gf-nreq)
1881 "the method has ~A required arguments than the generic function."
1882 (comparison-description nreq gf-nreq)))
1883 (unless (= nopt gf-nopt)
1885 "the method has ~A optional arguments than the generic function."
1886 (comparison-description nopt gf-nopt)))
1887 (unless (eq (or keysp restp) gf-key/rest-p)
1889 "the method and generic function differ in whether they accept~_~
1890 &REST or &KEY arguments."))
1891 (when (consp gf-keywords)
1892 (unless (or (and restp (not keysp))
1894 (every (lambda (k) (memq k keywords)) gf-keywords))
1895 (lose "the method does not accept each of the &KEY arguments~2I~_~
1899 (defvar *sm-specializers-index*
1900 (!bootstrap-slot-index 'standard-method 'specializers))
1901 (defvar *sm-%function-index*
1902 (!bootstrap-slot-index 'standard-method '%function))
1903 (defvar *sm-qualifiers-index*
1904 (!bootstrap-slot-index 'standard-method 'qualifiers))
1905 (defvar *sm-plist-index*
1906 (!bootstrap-slot-index 'standard-method 'plist))
1908 ;;; FIXME: we don't actually need this; we could test for the exact
1909 ;;; class and deal with it as appropriate. In fact we probably don't
1910 ;;; need it anyway because we only use this for METHOD-SPECIALIZERS on
1911 ;;; the standard reader method for METHOD-SPECIALIZERS. Probably.
1912 (dolist (s '(specializers %function plist))
1913 (aver (= (symbol-value (intern (format nil "*SM-~A-INDEX*" s)))
1914 (!bootstrap-slot-index 'standard-reader-method s)
1915 (!bootstrap-slot-index 'standard-writer-method s)
1916 (!bootstrap-slot-index 'standard-boundp-method s))))
1918 (defun safe-method-specializers (method)
1919 (let ((standard-method-classes
1920 (list *the-class-standard-method*
1921 *the-class-standard-reader-method*
1922 *the-class-standard-writer-method*
1923 *the-class-standard-boundp-method*))
1924 (class (class-of method)))
1925 (if (member class standard-method-classes)
1926 (clos-slots-ref (get-slots method) *sm-specializers-index*)
1927 (method-specializers method))))
1928 (defun safe-method-fast-function (method)
1929 (let ((mf (safe-method-function method)))
1930 (and (typep mf '%method-function)
1931 (%method-function-fast-function mf))))
1932 (defun safe-method-function (method)
1933 (let ((standard-method-classes
1934 (list *the-class-standard-method*
1935 *the-class-standard-reader-method*
1936 *the-class-standard-writer-method*
1937 *the-class-standard-boundp-method*))
1938 (class (class-of method)))
1939 (if (member class standard-method-classes)
1940 (clos-slots-ref (get-slots method) *sm-%function-index*)
1941 (method-function method))))
1942 (defun safe-method-qualifiers (method)
1943 (let ((standard-method-classes
1944 (list *the-class-standard-method*
1945 *the-class-standard-reader-method*
1946 *the-class-standard-writer-method*
1947 *the-class-standard-boundp-method*))
1948 (class (class-of method)))
1949 (if (member class standard-method-classes)
1950 (clos-slots-ref (get-slots method) *sm-qualifiers-index*)
1951 (method-qualifiers method))))
1953 (defun set-arg-info1 (gf arg-info new-method methods was-valid-p first-p)
1954 (let* ((existing-p (and methods (cdr methods) new-method))
1955 (nreq (length (arg-info-metatypes arg-info)))
1956 (metatypes (if existing-p
1957 (arg-info-metatypes arg-info)
1959 (type (if existing-p
1960 (gf-info-simple-accessor-type arg-info)
1962 (when (arg-info-valid-p arg-info)
1963 (dolist (method (if new-method (list new-method) methods))
1964 (let* ((specializers (if (or (eq *boot-state* 'complete)
1965 (not (consp method)))
1966 (safe-method-specializers method)
1967 (early-method-specializers method t)))
1968 (class (if (or (eq *boot-state* 'complete) (not (consp method)))
1970 (early-method-class method)))
1973 (or (not (eq *boot-state* 'complete))
1974 (eq (generic-function-method-combination gf)
1975 *standard-method-combination*)))
1976 (cond ((or (eq class *the-class-standard-reader-method*)
1977 (eq class *the-class-global-reader-method*))
1979 ((or (eq class *the-class-standard-writer-method*)
1980 (eq class *the-class-global-writer-method*))
1982 ((or (eq class *the-class-standard-boundp-method*)
1983 (eq class *the-class-global-boundp-method*))
1985 (setq metatypes (mapcar #'raise-metatype metatypes specializers))
1986 (setq type (cond ((null type) new-type)
1987 ((eq type new-type) type)
1989 (setf (arg-info-metatypes arg-info) metatypes)
1990 (setf (gf-info-simple-accessor-type arg-info) type)))
1991 (when (or (not was-valid-p) first-p)
1992 (multiple-value-bind (c-a-m-emf std-p)
1995 (compute-applicable-methods-emf gf))
1996 (setf (gf-info-static-c-a-m-emf arg-info) c-a-m-emf)
1997 (setf (gf-info-c-a-m-emf-std-p arg-info) std-p)
1998 (unless (gf-info-c-a-m-emf-std-p arg-info)
1999 (setf (gf-info-simple-accessor-type arg-info) t))))
2001 (let ((name (if (eq *boot-state* 'complete)
2002 (generic-function-name gf)
2003 (!early-gf-name gf))))
2004 (setf (gf-precompute-dfun-and-emf-p arg-info)
2008 *internal-pcl-generalized-fun-name-symbols*))
2010 (t (let* ((symbol (fun-name-block-name name))
2011 (package (symbol-package symbol)))
2012 (and (or (eq package *pcl-package*)
2013 (memq package (package-use-list *pcl-package*)))
2014 ;; FIXME: this test will eventually be
2015 ;; superseded by the *internal-pcl...* test,
2016 ;; above. While we are in a process of
2017 ;; transition, however, it should probably
2019 (not (find #\Space (symbol-name symbol))))))))))
2020 (setf (gf-info-fast-mf-p arg-info)
2021 (or (not (eq *boot-state* 'complete))
2022 (let* ((method-class (generic-function-method-class gf))
2023 (methods (compute-applicable-methods
2024 #'make-method-lambda
2025 (list gf (class-prototype method-class)
2027 (and methods (null (cdr methods))
2028 (let ((specls (method-specializers (car methods))))
2029 (and (classp (car specls))
2030 (eq 'standard-generic-function
2031 (class-name (car specls)))
2032 (classp (cadr specls))
2033 (eq 'standard-method
2034 (class-name (cadr specls)))))))))
2037 ;;; This is the early definition of ENSURE-GENERIC-FUNCTION-USING-CLASS.
2039 ;;; The STATIC-SLOTS field of the funcallable instances used as early
2040 ;;; generic functions is used to store the early methods and early
2041 ;;; discriminator code for the early generic function. The static
2042 ;;; slots field of the fins contains a list whose:
2043 ;;; CAR - a list of the early methods on this early gf
2044 ;;; CADR - the early discriminator code for this method
2045 (defun ensure-generic-function-using-class (existing spec &rest keys
2046 &key (lambda-list nil
2048 argument-precedence-order
2051 (declare (ignore keys))
2052 (cond ((and existing (early-gf-p existing))
2054 (set-arg-info existing :lambda-list lambda-list))
2056 ((assoc spec *!generic-function-fixups* :test #'equal)
2058 (make-early-gf spec lambda-list lambda-list-p existing
2059 argument-precedence-order source-location)
2060 (bug "The function ~S is not already defined." spec)))
2062 (bug "~S should be on the list ~S."
2063 spec '*!generic-function-fixups*))
2065 (pushnew spec *!early-generic-functions* :test #'equal)
2066 (make-early-gf spec lambda-list lambda-list-p nil
2067 argument-precedence-order source-location))))
2069 (defun make-early-gf (spec &optional lambda-list lambda-list-p
2070 function argument-precedence-order source-location)
2071 (let ((fin (allocate-standard-funcallable-instance
2072 *sgf-wrapper* *sgf-slots-init*)))
2073 (set-funcallable-instance-function
2076 (if (eq spec 'print-object)
2077 #'(lambda (instance stream)
2078 (print-unreadable-object (instance stream :identity t)
2079 (format stream "std-instance")))
2080 #'(lambda (&rest args)
2081 (declare (ignore args))
2082 (error "The function of the funcallable-instance ~S~
2083 has not been set." fin)))))
2084 (setf (gdefinition spec) fin)
2085 (!bootstrap-set-slot 'standard-generic-function fin 'name spec)
2086 (!bootstrap-set-slot 'standard-generic-function
2090 (set-fun-name fin spec)
2091 (let ((arg-info (make-arg-info)))
2092 (setf (early-gf-arg-info fin) arg-info)
2094 (proclaim (defgeneric-declaration spec lambda-list))
2095 (if argument-precedence-order
2097 :lambda-list lambda-list
2098 :argument-precedence-order argument-precedence-order)
2099 (set-arg-info fin :lambda-list lambda-list))))
2102 (defun safe-gf-dfun-state (generic-function)
2103 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2104 (clos-slots-ref (get-slots generic-function) *sgf-dfun-state-index*)
2105 (gf-dfun-state generic-function)))
2106 (defun (setf safe-gf-dfun-state) (new-value generic-function)
2107 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2108 (setf (clos-slots-ref (get-slots generic-function)
2109 *sgf-dfun-state-index*)
2111 (setf (gf-dfun-state generic-function) new-value)))
2113 (defun set-dfun (gf &optional dfun cache info)
2114 (let ((new-state (if (and dfun (or cache info))
2115 (list* dfun cache info)
2118 ((eq *boot-state* 'complete)
2119 ;; Check that we are under the lock.
2121 (aver (eq sb-thread:*current-thread* (sb-thread::spinlock-value (gf-lock gf))))
2122 (setf (safe-gf-dfun-state gf) new-state))
2124 (setf (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*)
2128 (defun gf-dfun-cache (gf)
2129 (let ((state (if (eq *boot-state* 'complete)
2130 (safe-gf-dfun-state gf)
2131 (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*))))
2134 (cons (cadr state)))))
2136 (defun gf-dfun-info (gf)
2137 (let ((state (if (eq *boot-state* 'complete)
2138 (safe-gf-dfun-state gf)
2139 (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*))))
2142 (cons (cddr state)))))
2144 (defvar *sgf-name-index*
2145 (!bootstrap-slot-index 'standard-generic-function 'name))
2147 (defun !early-gf-name (gf)
2148 (clos-slots-ref (get-slots gf) *sgf-name-index*))
2150 (defun gf-lambda-list (gf)
2151 (let ((arg-info (if (eq *boot-state* 'complete)
2153 (early-gf-arg-info gf))))
2154 (if (eq :no-lambda-list (arg-info-lambda-list arg-info))
2155 (let ((methods (if (eq *boot-state* 'complete)
2156 (generic-function-methods gf)
2157 (early-gf-methods gf))))
2160 (warn "no way to determine the lambda list for ~S" gf)
2162 (let* ((method (car (last methods)))
2163 (ll (if (consp method)
2164 (early-method-lambda-list method)
2165 (method-lambda-list method))))
2166 (create-gf-lambda-list ll))))
2167 (arg-info-lambda-list arg-info))))
2169 (defmacro real-ensure-gf-internal (gf-class all-keys env)
2171 (cond ((symbolp ,gf-class)
2172 (setq ,gf-class (find-class ,gf-class t ,env)))
2173 ((classp ,gf-class))
2175 (error "The :GENERIC-FUNCTION-CLASS argument (~S) was neither a~%~
2176 class nor a symbol that names a class."
2178 (unless (class-finalized-p ,gf-class)
2179 (if (class-has-a-forward-referenced-superclass-p ,gf-class)
2180 ;; FIXME: reference MOP documentation -- this is an
2181 ;; additional requirement on our users
2182 (error "The generic function class ~S is not finalizeable" ,gf-class)
2183 (finalize-inheritance ,gf-class)))
2184 (remf ,all-keys :generic-function-class)
2185 (remf ,all-keys :environment)
2186 (let ((combin (getf ,all-keys :method-combination '.shes-not-there.)))
2187 (unless (eq combin '.shes-not-there.)
2188 (setf (getf ,all-keys :method-combination)
2189 (find-method-combination (class-prototype ,gf-class)
2192 (let ((method-class (getf ,all-keys :method-class '.shes-not-there.)))
2193 (unless (eq method-class '.shes-not-there.)
2194 (setf (getf ,all-keys :method-class)
2195 (cond ((classp method-class)
2197 (t (find-class method-class t ,env))))))))
2199 (defun real-ensure-gf-using-class--generic-function
2203 &key environment (lambda-list nil lambda-list-p)
2204 (generic-function-class 'standard-generic-function)
2206 (real-ensure-gf-internal generic-function-class all-keys environment)
2207 ;; KLUDGE: the above macro does SETQ on GENERIC-FUNCTION-CLASS,
2208 ;; which is what makes the next line work
2209 (unless (eq (class-of existing) generic-function-class)
2210 (change-class existing generic-function-class))
2212 (apply #'reinitialize-instance existing all-keys)
2214 (proclaim (defgeneric-declaration fun-name lambda-list)))))
2216 (defun real-ensure-gf-using-class--null
2220 &key environment (lambda-list nil lambda-list-p)
2221 (generic-function-class 'standard-generic-function)
2223 (declare (ignore existing))
2224 (real-ensure-gf-internal generic-function-class all-keys environment)
2226 (setf (gdefinition fun-name)
2227 (apply #'make-instance generic-function-class
2228 :name fun-name all-keys))
2230 (proclaim (defgeneric-declaration fun-name lambda-list)))))
2232 (defun safe-gf-arg-info (generic-function)
2233 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2234 (clos-slots-ref (fsc-instance-slots generic-function)
2235 *sgf-arg-info-index*)
2236 (gf-arg-info generic-function)))
2238 ;;; FIXME: this function took on a slightly greater role than it
2239 ;;; previously had around 2005-11-02, when CSR fixed the bug whereby
2240 ;;; having more than one subclass of standard-generic-function caused
2241 ;;; the whole system to die horribly through a metacircle in
2242 ;;; GF-ARG-INFO. The fix is to be slightly more disciplined about
2243 ;;; calling accessor methods -- we call GET-GENERIC-FUN-INFO when
2244 ;;; computing discriminating functions, so we need to be careful about
2245 ;;; having a base case for the recursion, and we provide that with the
2246 ;;; STANDARD-GENERIC-FUNCTION case below. However, we are not (yet)
2247 ;;; as disciplined as CLISP's CLOS/MOP, and it would be nice to get to
2248 ;;; that stage, where all potentially dangerous cases are enumerated
2249 ;;; and stopped. -- CSR, 2005-11-02.
2250 (defun get-generic-fun-info (gf)
2251 ;; values nreq applyp metatypes nkeys arg-info
2252 (multiple-value-bind (applyp metatypes arg-info)
2253 (let* ((arg-info (if (early-gf-p gf)
2254 (early-gf-arg-info gf)
2255 (safe-gf-arg-info gf)))
2256 (metatypes (arg-info-metatypes arg-info)))
2257 (values (arg-info-applyp arg-info)
2260 (values (length metatypes) applyp metatypes
2261 (count-if (lambda (x) (neq x t)) metatypes)
2264 (defun early-make-a-method (class qualifiers arglist specializers initargs doc
2265 &key slot-name object-class method-class-function)
2268 ;; Figure out whether we got class objects or class names as the
2269 ;; specializers and set parsed and unparsed appropriately. If we
2270 ;; got class objects, then we can compute unparsed, but if we got
2271 ;; class names we don't try to compute parsed.
2273 ;; Note that the use of not symbolp in this call to every should be
2274 ;; read as 'classp' we can't use classp itself because it doesn't
2276 (if (every (lambda (s) (not (symbolp s))) specializers)
2277 (setq parsed specializers
2278 unparsed (mapcar (lambda (s)
2279 (if (eq s t) t (class-name s)))
2281 (setq unparsed specializers
2286 (getf initargs :function)
2287 (let ((mf (getf initargs :function)))
2289 (and (typep mf '%method-function)
2290 (%method-function-fast-function mf)))
2292 ;; the parsed specializers. This is used by
2293 ;; EARLY-METHOD-SPECIALIZERS to cache the parse.
2294 ;; Note that this only comes into play when there is
2295 ;; more than one early method on an early gf.
2298 ;; A list to which REAL-MAKE-A-METHOD can be applied
2299 ;; to make a real method corresponding to this early
2302 (list class qualifiers arglist unparsed
2305 (list :slot-name slot-name :object-class object-class
2306 :method-class-function method-class-function))))))
2307 (initialize-method-function initargs result)
2310 (defun real-make-a-method
2311 (class qualifiers lambda-list specializers initargs doc
2312 &rest args &key slot-name object-class method-class-function)
2313 (if method-class-function
2314 (let* ((object-class (if (classp object-class) object-class
2315 (find-class object-class)))
2316 (slots (class-direct-slots object-class))
2317 (slot-definition (find slot-name slots
2318 :key #'slot-definition-name)))
2320 (aver slot-definition)
2321 (let ((initargs (list* :qualifiers qualifiers :lambda-list lambda-list
2322 :specializers specializers :documentation doc
2323 :slot-definition slot-definition
2324 :slot-name slot-name initargs)))
2325 (apply #'make-instance
2326 (apply method-class-function object-class slot-definition
2329 (apply #'make-instance class :qualifiers qualifiers
2330 :lambda-list lambda-list :specializers specializers
2331 :documentation doc (append args initargs))))
2333 (defun early-method-function (early-method)
2334 (values (cadr early-method) (caddr early-method)))
2336 (defun early-method-class (early-method)
2337 (find-class (car (fifth early-method))))
2339 (defun early-method-standard-accessor-p (early-method)
2340 (let ((class (first (fifth early-method))))
2341 (or (eq class 'standard-reader-method)
2342 (eq class 'standard-writer-method)
2343 (eq class 'standard-boundp-method))))
2345 (defun early-method-standard-accessor-slot-name (early-method)
2346 (eighth (fifth early-method)))
2348 ;;; Fetch the specializers of an early method. This is basically just
2349 ;;; a simple accessor except that when the second argument is t, this
2350 ;;; converts the specializers from symbols into class objects. The
2351 ;;; class objects are cached in the early method, this makes
2352 ;;; bootstrapping faster because the class objects only have to be
2356 ;;; The second argument should only be passed as T by
2357 ;;; early-lookup-method. This is to implement the rule that only when
2358 ;;; there is more than one early method on a generic function is the
2359 ;;; conversion from class names to class objects done. This
2360 ;;; corresponds to the fact that we are only allowed to have one
2361 ;;; method on any generic function up until the time classes exist.
2362 (defun early-method-specializers (early-method &optional objectsp)
2363 (if (and (listp early-method)
2364 (eq (car early-method) :early-method))
2365 (cond ((eq objectsp t)
2366 (or (fourth early-method)
2367 (setf (fourth early-method)
2368 (mapcar #'find-class (cadddr (fifth early-method))))))
2370 (fourth (fifth early-method))))
2371 (error "~S is not an early-method." early-method)))
2373 (defun early-method-qualifiers (early-method)
2374 (second (fifth early-method)))
2376 (defun early-method-lambda-list (early-method)
2377 (third (fifth early-method)))
2379 (defun early-method-initargs (early-method)
2380 (fifth (fifth early-method)))
2382 (defun (setf early-method-initargs) (new-value early-method)
2383 (setf (fifth (fifth early-method)) new-value))
2385 (defun early-add-named-method (generic-function-name qualifiers
2386 specializers arglist &rest initargs)
2387 (let* (;; we don't need to deal with the :generic-function-class
2388 ;; argument here because the default,
2389 ;; STANDARD-GENERIC-FUNCTION, is right for all early generic
2390 ;; functions. (See REAL-ADD-NAMED-METHOD)
2391 (gf (ensure-generic-function generic-function-name))
2393 (dolist (m (early-gf-methods gf))
2394 (when (and (equal (early-method-specializers m) specializers)
2395 (equal (early-method-qualifiers m) qualifiers))
2397 (setf (getf (getf initargs 'plist) :name)
2398 (make-method-spec gf qualifiers specializers))
2399 (let ((new (make-a-method 'standard-method qualifiers arglist
2400 specializers initargs ())))
2401 (when existing (remove-method gf existing))
2402 (add-method gf new))))
2404 ;;; This is the early version of ADD-METHOD. Later this will become a
2405 ;;; generic function. See !FIX-EARLY-GENERIC-FUNCTIONS which has
2406 ;;; special knowledge about ADD-METHOD.
2407 (defun add-method (generic-function method)
2408 (when (not (fsc-instance-p generic-function))
2409 (error "Early ADD-METHOD didn't get a funcallable instance."))
2410 (when (not (and (listp method) (eq (car method) :early-method)))
2411 (error "Early ADD-METHOD didn't get an early method."))
2412 (push method (early-gf-methods generic-function))
2413 (set-arg-info generic-function :new-method method)
2414 (unless (assoc (!early-gf-name generic-function)
2415 *!generic-function-fixups*
2417 (update-dfun generic-function)))
2419 ;;; This is the early version of REMOVE-METHOD. See comments on
2420 ;;; the early version of ADD-METHOD.
2421 (defun remove-method (generic-function method)
2422 (when (not (fsc-instance-p generic-function))
2423 (error "An early remove-method didn't get a funcallable instance."))
2424 (when (not (and (listp method) (eq (car method) :early-method)))
2425 (error "An early remove-method didn't get an early method."))
2426 (setf (early-gf-methods generic-function)
2427 (remove method (early-gf-methods generic-function)))
2428 (set-arg-info generic-function)
2429 (unless (assoc (!early-gf-name generic-function)
2430 *!generic-function-fixups*
2432 (update-dfun generic-function)))
2434 ;;; This is the early version of GET-METHOD. See comments on the early
2435 ;;; version of ADD-METHOD.
2436 (defun get-method (generic-function qualifiers specializers
2437 &optional (errorp t))
2438 (if (early-gf-p generic-function)
2439 (or (dolist (m (early-gf-methods generic-function))
2440 (when (and (or (equal (early-method-specializers m nil)
2442 (equal (early-method-specializers m t)
2444 (equal (early-method-qualifiers m) qualifiers))
2447 (error "can't get early method")
2449 (real-get-method generic-function qualifiers specializers errorp)))
2451 (defun !fix-early-generic-functions ()
2452 (let ((accessors nil))
2453 ;; Rearrange *!EARLY-GENERIC-FUNCTIONS* to speed up
2454 ;; FIX-EARLY-GENERIC-FUNCTIONS.
2455 (dolist (early-gf-spec *!early-generic-functions*)
2456 (when (every #'early-method-standard-accessor-p
2457 (early-gf-methods (gdefinition early-gf-spec)))
2458 (push early-gf-spec accessors)))
2459 (dolist (spec (nconc accessors
2460 '(accessor-method-slot-name
2461 generic-function-methods
2466 slot-definition-location
2467 slot-definition-name
2470 class-precedence-list
2471 slot-boundp-using-class
2472 (setf slot-value-using-class)
2473 slot-value-using-class
2476 funcallable-standard-class-p
2479 (setq *!early-generic-functions*
2481 (delete spec *!early-generic-functions* :test #'equal))))
2483 (dolist (early-gf-spec *!early-generic-functions*)
2484 (/show early-gf-spec)
2485 (let* ((gf (gdefinition early-gf-spec))
2486 (methods (mapcar (lambda (early-method)
2487 (let ((args (copy-list (fifth
2490 (early-method-specializers
2492 (apply #'real-make-a-method args)))
2493 (early-gf-methods gf))))
2494 (setf (generic-function-method-class gf) *the-class-standard-method*)
2495 (setf (generic-function-method-combination gf)
2496 *standard-method-combination*)
2497 (set-methods gf methods)))
2499 (dolist (fn *!early-functions*)
2501 (setf (gdefinition (car fn)) (fdefinition (caddr fn))))
2503 (dolist (fixup *!generic-function-fixups*)
2505 (let* ((fspec (car fixup))
2506 (gf (gdefinition fspec))
2507 (methods (mapcar (lambda (method)
2508 (let* ((lambda-list (first method))
2509 (specializers (mapcar #'find-class (second method)))
2510 (method-fn-name (third method))
2511 (fn-name (or method-fn-name fspec))
2512 (fn (fdefinition fn-name))
2516 (lambda (args next-methods)
2520 `(call ,fn-name)))))
2521 (declare (type function fn))
2522 (make-a-method 'standard-method
2529 (setf (generic-function-method-class gf) *the-class-standard-method*)
2530 (setf (generic-function-method-combination gf)
2531 *standard-method-combination*)
2532 (set-methods gf methods))))
2533 (/show "leaving !FIX-EARLY-GENERIC-FUNCTIONS"))
2535 ;;; PARSE-DEFMETHOD is used by DEFMETHOD to parse the &REST argument
2536 ;;; into the 'real' arguments. This is where the syntax of DEFMETHOD
2537 ;;; is really implemented.
2538 (defun parse-defmethod (cdr-of-form)
2539 (declare (list cdr-of-form))
2540 (let ((name (pop cdr-of-form))
2543 (loop (if (and (car cdr-of-form) (atom (car cdr-of-form)))
2544 (push (pop cdr-of-form) qualifiers)
2545 (return (setq qualifiers (nreverse qualifiers)))))
2546 (setq spec-ll (pop cdr-of-form))
2547 (values name qualifiers spec-ll cdr-of-form)))
2549 (defun parse-specializers (generic-function specializers)
2550 (declare (list specializers))
2551 (flet ((parse (spec)
2552 (parse-specializer-using-class generic-function spec)))
2553 (mapcar #'parse specializers)))
2555 (defun unparse-specializers (generic-function specializers)
2556 (declare (list specializers))
2557 (flet ((unparse (spec)
2558 (unparse-specializer-using-class generic-function spec)))
2559 (mapcar #'unparse specializers)))
2561 (defun extract-parameters (specialized-lambda-list)
2562 (multiple-value-bind (parameters ignore1 ignore2)
2563 (parse-specialized-lambda-list specialized-lambda-list)
2564 (declare (ignore ignore1 ignore2))
2567 (defun extract-lambda-list (specialized-lambda-list)
2568 (multiple-value-bind (ignore1 lambda-list ignore2)
2569 (parse-specialized-lambda-list specialized-lambda-list)
2570 (declare (ignore ignore1 ignore2))
2573 (defun extract-specializer-names (specialized-lambda-list)
2574 (multiple-value-bind (ignore1 ignore2 specializers)
2575 (parse-specialized-lambda-list specialized-lambda-list)
2576 (declare (ignore ignore1 ignore2))
2579 (defun extract-required-parameters (specialized-lambda-list)
2580 (multiple-value-bind (ignore1 ignore2 ignore3 required-parameters)
2581 (parse-specialized-lambda-list specialized-lambda-list)
2582 (declare (ignore ignore1 ignore2 ignore3))
2583 required-parameters))
2585 (define-condition specialized-lambda-list-error
2586 (reference-condition simple-program-error)
2588 (:default-initargs :references (list '(:ansi-cl :section (3 4 3)))))
2590 (defun parse-specialized-lambda-list
2592 &optional supplied-keywords (allowed-keywords '(&optional &rest &key &aux))
2593 &aux (specialized-lambda-list-keywords
2594 '(&optional &rest &key &allow-other-keys &aux)))
2595 (let ((arg (car arglist)))
2596 (cond ((null arglist) (values nil nil nil nil))
2598 (values nil arglist nil nil))
2599 ((memq arg lambda-list-keywords)
2600 ;; non-standard lambda-list-keywords are errors.
2601 (unless (memq arg specialized-lambda-list-keywords)
2602 (error 'specialized-lambda-list-error
2603 :format-control "unknown specialized-lambda-list ~
2605 :format-arguments (list arg)))
2606 ;; no multiple &rest x &rest bla specifying
2607 (when (memq arg supplied-keywords)
2608 (error 'specialized-lambda-list-error
2609 :format-control "multiple occurrence of ~
2610 specialized-lambda-list keyword ~S~%"
2611 :format-arguments (list arg)))
2612 ;; And no placing &key in front of &optional, either.
2613 (unless (memq arg allowed-keywords)
2614 (error 'specialized-lambda-list-error
2615 :format-control "misplaced specialized-lambda-list ~
2617 :format-arguments (list arg)))
2618 ;; When we are at a lambda-list keyword, the parameters
2619 ;; don't include the lambda-list keyword; the lambda-list
2620 ;; does include the lambda-list keyword; and no
2621 ;; specializers are allowed to follow the lambda-list
2622 ;; keywords (at least for now).
2623 (multiple-value-bind (parameters lambda-list)
2624 (parse-specialized-lambda-list (cdr arglist)
2625 (cons arg supplied-keywords)
2627 (cons '&allow-other-keys
2628 (cdr (member arg allowed-keywords)))
2629 (cdr (member arg allowed-keywords))))
2630 (when (and (eq arg '&rest)
2631 (or (null lambda-list)
2632 (memq (car lambda-list)
2633 specialized-lambda-list-keywords)
2634 (not (or (null (cadr lambda-list))
2635 (memq (cadr lambda-list)
2636 specialized-lambda-list-keywords)))))
2637 (error 'specialized-lambda-list-error
2639 "in a specialized-lambda-list, excactly one ~
2640 variable must follow &REST.~%"
2641 :format-arguments nil))
2643 (cons arg lambda-list)
2647 ;; After a lambda-list keyword there can be no specializers.
2648 (multiple-value-bind (parameters lambda-list)
2649 (parse-specialized-lambda-list (cdr arglist)
2652 (values (cons (if (listp arg) (car arg) arg) parameters)
2653 (cons arg lambda-list)
2657 (multiple-value-bind (parameters lambda-list specializers required)
2658 (parse-specialized-lambda-list (cdr arglist))
2659 (values (cons (if (listp arg) (car arg) arg) parameters)
2660 (cons (if (listp arg) (car arg) arg) lambda-list)
2661 (cons (if (listp arg) (cadr arg) t) specializers)
2662 (cons (if (listp arg) (car arg) arg) required)))))))
2664 (setq *boot-state* 'early)
2666 ;;; FIXME: In here there was a #-CMU definition of SYMBOL-MACROLET
2667 ;;; which used %WALKER stuff. That suggests to me that maybe the code
2668 ;;; walker stuff was only used for implementing stuff like that; maybe
2669 ;;; it's not needed any more? Hunt down what it was used for and see.
2671 (defun extract-the (form)
2672 (cond ((and (consp form) (eq (car form) 'the))
2673 (aver (proper-list-of-length-p 3))
2678 (defmacro with-slots (slots instance &body body)
2679 (let ((in (gensym)))
2680 `(let ((,in ,instance))
2681 (declare (ignorable ,in))
2682 ,@(let ((instance (extract-the instance)))
2683 (and (symbolp instance)
2684 `((declare (%variable-rebinding ,in ,instance)))))
2686 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2688 (if (symbolp slot-entry)
2692 (if (symbolp slot-entry)
2694 (cadr slot-entry))))
2696 (slot-value ,in ',slot-name))))
2700 (defmacro with-accessors (slots instance &body body)
2701 (let ((in (gensym)))
2702 `(let ((,in ,instance))
2703 (declare (ignorable ,in))
2704 ,@(let ((instance (extract-the instance)))
2705 (and (symbolp instance)
2706 `((declare (%variable-rebinding ,in ,instance)))))
2708 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2709 (let ((var-name (car slot-entry))
2710 (accessor-name (cadr slot-entry)))
2711 `(,var-name (,accessor-name ,in))))
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