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 (let ((fun (fdefinition fun-name)))
256 (warn 'sb-kernel:redefinition-with-defgeneric :name fun-name
257 :old fun :new-location source-location)
258 (when (generic-function-p fun)
259 (loop for method in (generic-function-initial-methods fun)
260 do (remove-method fun method))
261 (setf (generic-function-initial-methods fun) '()))))
262 (apply #'ensure-generic-function
264 :lambda-list lambda-list
265 :definition-source source-location
268 (define-condition generic-function-lambda-list-error
269 (reference-condition simple-program-error)
271 (:default-initargs :references (list '(:ansi-cl :section (3 4 2)))))
273 (defun check-gf-lambda-list (lambda-list)
274 (flet ((ensure (arg ok)
276 (error 'generic-function-lambda-list-error
278 "~@<invalid ~S ~_in the generic function lambda list ~S~:>"
279 :format-arguments (list arg lambda-list)))))
280 (multiple-value-bind (required optional restp rest keyp keys allowp
281 auxp aux morep more-context more-count)
282 (parse-lambda-list lambda-list)
283 (declare (ignore required)) ; since they're no different in a gf ll
284 (declare (ignore restp rest)) ; since they're no different in a gf ll
285 (declare (ignore allowp)) ; since &ALLOW-OTHER-KEYS is fine either way
286 (declare (ignore aux)) ; since we require AUXP=NIL
287 (declare (ignore more-context more-count)) ; safely ignored unless MOREP
288 ;; no defaults allowed for &OPTIONAL arguments
290 (ensure i (or (symbolp i)
291 (and (consp i) (symbolp (car i)) (null (cdr i))))))
292 ;; no defaults allowed for &KEY arguments
295 (ensure i (or (symbolp i)
297 (or (symbolp (car i))
305 (error "&AUX is not allowed in a generic function lambda list: ~S"
307 ;; Oh, *puhlease*... not specifically as per section 3.4.2 of
308 ;; the ANSI spec, but the CMU CL &MORE extension does not
310 (aver (not morep)))))
312 (defmacro defmethod (&rest args)
313 (multiple-value-bind (name qualifiers lambda-list body)
314 (parse-defmethod args)
316 ;; KLUDGE: this double expansion is quite a monumental
317 ;; workaround: it comes about because of a fantastic interaction
318 ;; between the processing rules of CLHS 3.2.3.1 and the
319 ;; bizarreness of MAKE-METHOD-LAMBDA.
321 ;; MAKE-METHOD-LAMBDA can be called by the user, and if the
322 ;; lambda itself doesn't refer to outside bindings the return
323 ;; value must be compileable in the null lexical environment.
324 ;; However, the function must also refer somehow to the
325 ;; associated method object, so that it can call NO-NEXT-METHOD
326 ;; with the appropriate arguments if there is no next method --
327 ;; but when the function is generated, the method object doesn't
330 ;; In order to resolve this issue, we insert a literal cons cell
331 ;; into the body of the method lambda, return the same cons cell
332 ;; as part of the second (initargs) return value of
333 ;; MAKE-METHOD-LAMBDA, and a method on INITIALIZE-INSTANCE fills
334 ;; in the cell when the method is created. However, this
335 ;; strategy depends on having a fresh cons cell for every method
336 ;; lambda, which (without the workaround below) is skewered by
337 ;; the processing in CLHS 3.2.3.1, which permits implementations
338 ;; to macroexpand the bodies of EVAL-WHEN forms with both
339 ;; :COMPILE-TOPLEVEL and :LOAD-TOPLEVEL only once. The
340 ;; expansion below forces the double expansion in those cases,
341 ;; while expanding only once in the common case.
342 (eval-when (:load-toplevel)
343 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body))
344 (eval-when (:execute)
345 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body)))))
347 (defmacro %defmethod-expander
348 (name qualifiers lambda-list body &environment env)
349 (multiple-value-bind (proto-gf proto-method)
350 (prototypes-for-make-method-lambda name)
351 (expand-defmethod name proto-gf proto-method qualifiers
352 lambda-list body env)))
355 (defun prototypes-for-make-method-lambda (name)
356 (if (not (eq *boot-state* 'complete))
358 (let ((gf? (and (fboundp name)
359 (gdefinition name))))
361 (not (generic-function-p gf?)))
362 (values (class-prototype (find-class 'standard-generic-function))
363 (class-prototype (find-class 'standard-method)))
365 (class-prototype (or (generic-function-method-class gf?)
366 (find-class 'standard-method))))))))
368 ;;; Take a name which is either a generic function name or a list specifying
369 ;;; a SETF generic function (like: (SETF <generic-function-name>)). Return
370 ;;; the prototype instance of the method-class for that generic function.
372 ;;; If there is no generic function by that name, this returns the
373 ;;; default value, the prototype instance of the class
374 ;;; STANDARD-METHOD. This default value is also returned if the spec
375 ;;; names an ordinary function or even a macro. In effect, this leaves
376 ;;; the signalling of the appropriate error until load time.
378 ;;; Note: During bootstrapping, this function is allowed to return NIL.
379 (defun method-prototype-for-gf (name)
380 (let ((gf? (and (fboundp name)
381 (gdefinition name))))
382 (cond ((neq *boot-state* 'complete) nil)
384 (not (generic-function-p gf?))) ; Someone else MIGHT
385 ; error at load time.
386 (class-prototype (find-class 'standard-method)))
388 (class-prototype (or (generic-function-method-class gf?)
389 (find-class 'standard-method)))))))
391 (defun expand-defmethod (name
398 (multiple-value-bind (method-lambda unspecialized-lambda-list specializers)
399 (add-method-declarations name qualifiers lambda-list body env)
400 (multiple-value-bind (method-function-lambda initargs)
401 (make-method-lambda proto-gf proto-method method-lambda env)
402 (let ((initargs-form (make-method-initargs-form
403 proto-gf proto-method method-function-lambda
405 (specializers-form (make-method-specializers-form
406 proto-gf proto-method specializers env)))
408 ;; Note: We could DECLAIM the ftype of the generic function
409 ;; here, since ANSI specifies that we create it if it does
410 ;; not exist. However, I chose not to, because I think it's
411 ;; more useful to support a style of programming where every
412 ;; generic function has an explicit DEFGENERIC and any typos
413 ;; in DEFMETHODs are warned about. Otherwise
415 ;; (DEFGENERIC FOO-BAR-BLETCH (X))
416 ;; (DEFMETHOD FOO-BAR-BLETCH ((X HASH-TABLE)) ..)
417 ;; (DEFMETHOD FOO-BRA-BLETCH ((X SIMPLE-VECTOR)) ..)
418 ;; (DEFMETHOD FOO-BAR-BLETCH ((X VECTOR)) ..)
419 ;; (DEFMETHOD FOO-BAR-BLETCH ((X ARRAY)) ..)
420 ;; (DEFMETHOD FOO-BAR-BLETCH ((X LIST)) ..)
422 ;; compiles without raising an error and runs without
423 ;; raising an error (since SIMPLE-VECTOR cases fall through
424 ;; to VECTOR) but still doesn't do what was intended. I hate
425 ;; that kind of bug (code which silently gives the wrong
426 ;; answer), so we don't do a DECLAIM here. -- WHN 20000229
427 ,(make-defmethod-form name qualifiers specializers-form
428 unspecialized-lambda-list
430 (class-name (class-of proto-method))
434 (defun interned-symbol-p (x)
435 (and (symbolp x) (symbol-package x)))
437 (defun make-defmethod-form
438 (name qualifiers specializers unspecialized-lambda-list
439 method-class-name initargs-form)
442 (if (and (interned-symbol-p (fun-name-block-name name))
443 (every #'interned-symbol-p qualifiers)
446 (and (eq (car s) 'eql)
448 (let ((sv (constant-form-value (cadr s))))
449 (or (interned-symbol-p sv)
452 (standard-char-p sv)))))
453 (interned-symbol-p s)))
455 (consp initargs-form)
456 (eq (car initargs-form) 'list*)
457 (memq (cadr initargs-form) '(:function))
458 (consp (setq fn (caddr initargs-form)))
459 (eq (car fn) 'function)
460 (consp (setq fn-lambda (cadr fn)))
461 (eq (car fn-lambda) 'lambda)
462 (bug "Really got here"))
463 (let* ((specls (mapcar (lambda (specl)
465 ;; CONSTANT-FORM-VALUE? What I
466 ;; kind of want to know, though,
467 ;; is what happens if we don't do
468 ;; this for some slow-method
469 ;; function because of a hairy
470 ;; lexenv -- is the only bad
471 ;; effect that the method
472 ;; function ends up unnamed? If
473 ;; so, couldn't we arrange to
475 `(,(car specl) ,(eval (cadr specl)))
478 (mname `(,(if (eq (cadr initargs-form) :function)
479 'slow-method 'fast-method)
480 ,name ,@qualifiers ,specls)))
482 (defun ,mname ,(cadr fn-lambda)
484 ,(make-defmethod-form-internal
485 name qualifiers `',specls
486 unspecialized-lambda-list method-class-name
487 `(list* ,(cadr initargs-form)
489 ,@(cdddr initargs-form)))))
490 (make-defmethod-form-internal
494 `(list ,@(mapcar (lambda (specializer)
495 (if (consp specializer)
496 ``(,',(car specializer)
497 ,,(cadr specializer))
500 unspecialized-lambda-list
504 (defun make-defmethod-form-internal
505 (name qualifiers specializers-form unspecialized-lambda-list
506 method-class-name initargs-form)
512 ',unspecialized-lambda-list
514 (sb-c:source-location)))
516 (defmacro make-method-function (method-lambda &environment env)
517 (multiple-value-bind (proto-gf proto-method)
518 (prototypes-for-make-method-lambda nil)
519 (multiple-value-bind (method-function-lambda initargs)
520 (make-method-lambda proto-gf proto-method method-lambda env)
521 (make-method-initargs-form proto-gf
523 method-function-lambda
527 (defun add-method-declarations (name qualifiers lambda-list body env)
528 (declare (ignore env))
529 (multiple-value-bind (parameters unspecialized-lambda-list specializers)
530 (parse-specialized-lambda-list lambda-list)
531 (multiple-value-bind (real-body declarations documentation)
533 (values `(lambda ,unspecialized-lambda-list
534 ,@(when documentation `(,documentation))
535 ;; (Old PCL code used a somewhat different style of
536 ;; list for %METHOD-NAME values. Our names use
537 ;; ,@QUALIFIERS instead of ,QUALIFIERS so that the
538 ;; method names look more like what you see in a
541 ;; FIXME: As of sbcl-0.7.0.6, code elsewhere, at
542 ;; least the code to set up named BLOCKs around the
543 ;; bodies of methods, depends on the function's base
544 ;; name being the first element of the %METHOD-NAME
545 ;; list. It would be good to remove this dependency,
546 ;; perhaps by building the BLOCK here, or by using
547 ;; another declaration (e.g. %BLOCK-NAME), so that
548 ;; our method debug names are free to have any format,
549 ;; e.g. (:METHOD PRINT-OBJECT :AROUND (CLOWN T)).
551 ;; Further, as of sbcl-0.7.9.10, the code to
552 ;; implement NO-NEXT-METHOD is coupled to the form of
553 ;; this declaration; see the definition of
554 ;; CALL-NO-NEXT-METHOD (and the passing of
555 ;; METHOD-NAME-DECLARATION arguments around the
556 ;; various CALL-NEXT-METHOD logic).
557 (declare (%method-name (,name
560 (declare (%method-lambda-list ,@lambda-list))
563 unspecialized-lambda-list specializers))))
565 (defun real-make-method-initargs-form (proto-gf proto-method
566 method-lambda initargs env)
567 (declare (ignore proto-gf proto-method))
568 (unless (and (consp method-lambda)
569 (eq (car method-lambda) 'lambda))
570 (error "The METHOD-LAMBDA argument to MAKE-METHOD-FUNCTION, ~S, ~
571 is not a lambda form."
573 (make-method-initargs-form-internal method-lambda initargs env))
575 (unless (fboundp 'make-method-initargs-form)
576 (setf (gdefinition 'make-method-initargs-form)
577 (symbol-function 'real-make-method-initargs-form)))
579 ;;; When bootstrapping PCL MAKE-METHOD-LAMBDA starts out as a regular
580 ;;; functions: REAL-MAKE-METHOD-LAMBDA set to the fdefinition of
581 ;;; MAKE-METHOD-LAMBDA. Once generic functions are born, the
582 ;;; REAL-MAKE-METHOD lambda is used as the body of the default method.
583 ;;; MAKE-METHOD-LAMBDA-INTERNAL is split out into a separate function
584 ;;; so that changing it in a live image is easy, and changes actually
586 (defun real-make-method-lambda (proto-gf proto-method method-lambda env)
587 (make-method-lambda-internal proto-gf proto-method method-lambda env))
589 (unless (fboundp 'make-method-lambda)
590 (setf (gdefinition 'make-method-lambda)
591 (symbol-function 'real-make-method-lambda)))
593 (defun make-method-lambda-internal (proto-gf proto-method method-lambda env)
594 (declare (ignore proto-gf proto-method))
595 (unless (and (consp method-lambda) (eq (car method-lambda) 'lambda))
596 (error "The METHOD-LAMBDA argument to MAKE-METHOD-LAMBDA, ~S, ~
597 is not a lambda form."
599 (multiple-value-bind (real-body declarations documentation)
600 (parse-body (cddr method-lambda))
601 (let* ((name-decl (get-declaration '%method-name declarations))
602 (sll-decl (get-declaration '%method-lambda-list declarations))
603 (method-name (when (consp name-decl) (car name-decl)))
604 (generic-function-name (when method-name (car method-name)))
605 (specialized-lambda-list (or sll-decl (cadr method-lambda)))
606 ;; the method-cell is a way of communicating what method a
607 ;; method-function implements, for the purpose of
608 ;; NO-NEXT-METHOD. We need something that can be shared
609 ;; between function and initargs, but not something that
610 ;; will be coalesced as a constant (because we are naughty,
611 ;; oh yes) with the expansion of any other methods in the
612 ;; same file. -- CSR, 2007-05-30
613 (method-cell (list (make-symbol "METHOD-CELL"))))
614 (multiple-value-bind (parameters lambda-list specializers)
615 (parse-specialized-lambda-list specialized-lambda-list)
616 (let* ((required-parameters
617 (mapcar (lambda (r s) (declare (ignore s)) r)
620 (slots (mapcar #'list required-parameters))
623 ;; These declarations seem to be used by PCL to pass
624 ;; information to itself; when I tried to delete 'em
625 ;; ca. 0.6.10 it didn't work. I'm not sure how
626 ;; they work, but note the (VAR-DECLARATION '%CLASS ..)
627 ;; expression in CAN-OPTIMIZE-ACCESS1. -- WHN 2000-12-30
629 (mapcar (lambda (a s) (and (symbolp s)
634 ;; These TYPE declarations weren't in the original
635 ;; PCL code, but the Python compiler likes them a
636 ;; lot. (We're telling the compiler about our
637 ;; knowledge of specialized argument types so that
638 ;; it can avoid run-time type dispatch overhead,
639 ;; which can be a huge win for Python.)
641 ;; KLUDGE: when I tried moving these to
642 ;; ADD-METHOD-DECLARATIONS, things broke. No idea
643 ;; why. -- CSR, 2004-06-16
644 ,@(mapcar #'parameter-specializer-declaration-in-defmethod
648 ;; Remove the documentation string and insert the
649 ;; appropriate class declarations. The documentation
650 ;; string is removed to make it easy for us to insert
651 ;; new declarations later, they will just go after the
652 ;; CADR of the method lambda. The class declarations
653 ;; are inserted to communicate the class of the method's
654 ;; arguments to the code walk.
655 `(lambda ,lambda-list
656 ;; The default ignorability of method parameters
657 ;; doesn't seem to be specified by ANSI. PCL had
658 ;; them basically ignorable but was a little
659 ;; inconsistent. E.g. even though the two
660 ;; method definitions
661 ;; (DEFMETHOD FOO ((X T) (Y T)) "Z")
662 ;; (DEFMETHOD FOO ((X T) Y) "Z")
663 ;; are otherwise equivalent, PCL treated Y as
664 ;; ignorable in the first definition but not in the
665 ;; second definition. We make all required
666 ;; parameters ignorable as a way of systematizing
667 ;; the old PCL behavior. -- WHN 2000-11-24
668 (declare (ignorable ,@required-parameters))
671 (block ,(fun-name-block-name generic-function-name)
673 (constant-value-p (and (null (cdr real-body))
674 (constantp (car real-body))))
675 (constant-value (and constant-value-p
676 (constant-form-value (car real-body))))
677 (plist (and constant-value-p
678 (or (typep constant-value
679 '(or number character))
680 (and (symbolp constant-value)
681 (symbol-package constant-value)))
682 (list :constant-value constant-value)))
683 (applyp (dolist (p lambda-list nil)
684 (cond ((memq p '(&optional &rest &key))
689 (walked-lambda call-next-method-p closurep
690 next-method-p-p setq-p
692 (walk-method-lambda method-lambda
696 (multiple-value-bind (walked-lambda-body
698 walked-documentation)
699 (parse-body (cddr walked-lambda))
700 (declare (ignore walked-documentation))
701 (when (some #'cdr slots)
702 (let ((slot-name-lists (slot-name-lists-from-slots slots)))
704 `(,@(when slot-name-lists
705 `(:slot-name-lists ,slot-name-lists))
707 (setq walked-lambda-body
708 `((pv-binding (,required-parameters
712 :slot-name-lists ',slot-name-lists)))
713 ,@walked-lambda-body)))))
714 (when (and (memq '&key lambda-list)
715 (not (memq '&allow-other-keys lambda-list)))
716 (let ((aux (memq '&aux lambda-list)))
717 (setq lambda-list (nconc (ldiff lambda-list aux)
718 (list '&allow-other-keys)
720 (values `(lambda (.method-args. .next-methods.)
721 (simple-lexical-method-functions
722 (,lambda-list .method-args. .next-methods.
725 :next-method-p-p ,next-method-p-p
727 :method-cell ,method-cell
730 ,@walked-declarations
732 (declare (disable-package-locks
733 %parameter-binding-modified))
734 (symbol-macrolet ((%parameter-binding-modified
735 ',@parameters-setqd))
736 (declare (enable-package-locks
737 %parameter-binding-modified))
738 ,@walked-lambda-body))))
739 `(,@(when call-next-method-p `(method-cell ,method-cell))
740 ,@(when plist `(plist ,plist))
741 ,@(when documentation `(:documentation ,documentation)))))))))))
743 (defun real-make-method-specializers-form
744 (proto-gf proto-method specializer-names env)
745 (declare (ignore env proto-gf proto-method))
748 ((and (eq *boot-state* 'complete)
751 ((symbolp name) `(find-class ',name))
752 ((consp name) (ecase (car name)
753 ((eql) `(intern-eql-specializer ,(cadr name)))
754 ((class-eq) `(class-eq-specializer (find-class ',(cadr name))))
755 ((prototype) `(fixme))))
757 `(list ,@(mapcar #'parse specializer-names))))
759 (unless (fboundp 'make-method-specializers-form)
760 (setf (gdefinition 'make-method-specializers-form)
761 (symbol-function 'real-make-method-specializers-form)))
763 (defun real-parse-specializer-using-class (generic-function specializer)
764 (let ((result (specializer-from-type specializer)))
765 (if (specializerp result)
767 (error "~@<~S cannot be parsed as a specializer for ~S.~@:>"
768 specializer generic-function))))
770 (unless (fboundp 'parse-specializer-using-class)
771 (setf (gdefinition 'parse-specializer-using-class)
772 (symbol-function 'real-parse-specializer-using-class)))
774 (defun real-unparse-specializer-using-class (generic-function specializer)
775 (if (specializerp specializer)
776 ;; FIXME: this HANDLER-CASE is a bit of a hammer to crack a nut:
777 ;; the idea is that we want to unparse permissively, so that the
778 ;; lazy (or rather the "portable") specializer extender (who
779 ;; does not define methods on these new SBCL-specific MOP
780 ;; functions) can still subclass specializer and define methods
781 ;; without everything going wrong. Making it cleaner and
782 ;; clearer that that is what we are defending against would be
783 ;; nice. -- CSR, 2007-06-01
785 (let ((type (specializer-type specializer)))
786 (if (and (consp type) (eq (car type) 'class))
787 (let* ((class (cadr type))
788 (class-name (class-name class)))
789 (if (eq class (find-class class-name nil))
793 (error () specializer))
794 (error "~@<~S is not a legal specializer for ~S.~@:>"
795 specializer generic-function)))
797 (unless (fboundp 'unparse-specializer-using-class)
798 (setf (gdefinition 'unparse-specializer-using-class)
799 (symbol-function 'real-unparse-specializer-using-class)))
801 ;;; a helper function for creating Python-friendly type declarations
802 ;;; in DEFMETHOD forms
803 (defun parameter-specializer-declaration-in-defmethod (parameter specializer)
804 (cond ((and (consp specializer)
805 (eq (car specializer) 'eql))
806 ;; KLUDGE: ANSI, in its wisdom, says that
807 ;; EQL-SPECIALIZER-FORMs in EQL specializers are evaluated at
808 ;; DEFMETHOD expansion time. Thus, although one might think
810 ;; (DEFMETHOD FOO ((X PACKAGE)
813 ;; the PACKAGE and (EQL 12) forms are both parallel type
814 ;; names, they're not, as is made clear when you do
815 ;; (DEFMETHOD FOO ((X PACKAGE)
818 ;; where Y needs to be a symbol named "BAR", not some cons
819 ;; made by (CONS 'QUOTE 'BAR). I.e. when the
820 ;; EQL-SPECIALIZER-FORM is (EQL 'X), it requires an argument
821 ;; to be of type (EQL X). It'd be easy to transform one to
822 ;; the other, but it'd be somewhat messier to do so while
823 ;; ensuring that the EQL-SPECIALIZER-FORM is only EVAL'd
824 ;; once. (The new code wouldn't be messy, but it'd require a
825 ;; big transformation of the old code.) So instead we punt.
829 ;; KLUDGE: For some low-level implementation
830 ;; classes, perhaps because of some problems related
831 ;; to the incomplete integration of PCL into SBCL's
832 ;; type system, some specializer classes can't be
833 ;; declared as argument types. E.g.
834 ;; (DEFMETHOD FOO ((X SLOT-OBJECT))
835 ;; (DECLARE (TYPE SLOT-OBJECT X))
838 ;; (DEFSTRUCT BAR A B)
840 ;; perhaps because of the way that STRUCTURE-OBJECT
841 ;; inherits both from SLOT-OBJECT and from
842 ;; SB-KERNEL:INSTANCE. In an effort to sweep such
843 ;; problems under the rug, we exclude these problem
844 ;; cases by blacklisting them here. -- WHN 2001-01-19
845 (list 'slot-object #+nil (find-class 'slot-object)))
847 ((not (eq *boot-state* 'complete))
848 ;; KLUDGE: PCL, in its wisdom, sometimes calls methods with
849 ;; types which don't match their specializers. (Specifically,
850 ;; it calls ENSURE-CLASS-USING-CLASS (T NULL) with a non-NULL
851 ;; second argument.) Hopefully it only does this kind of
852 ;; weirdness when bootstrapping.. -- WHN 20000610
854 ((typep specializer 'eql-specializer)
855 `(type (eql ,(eql-specializer-object specializer)) ,parameter))
856 ((var-globally-special-p parameter)
857 ;; KLUDGE: Don't declare types for global special variables
858 ;; -- our rebinding magic for SETQ cases don't work right
861 ;; FIXME: It would be better to detect the SETQ earlier and
862 ;; skip declarations for specials only when needed, not
868 ;; Otherwise, we can usually make Python very happy.
870 ;; KLUDGE: Since INFO doesn't work right for class objects here,
871 ;; and they are valid specializers, see if the specializer is
872 ;; a named class, and use the name in that case -- otherwise
873 ;; the class instance is ok, since info will just return NIL, NIL.
875 ;; We still need to deal with the class case too, but at
876 ;; least #.(find-class 'integer) and integer as equivalent
877 ;; specializers with this.
878 (let* ((specializer-nameoid
879 (if (and (typep specializer 'class)
880 (let ((name (class-name specializer)))
881 (and name (symbolp name)
882 (eq specializer (find-class name nil)))))
883 (class-name specializer)
885 (kind (info :type :kind specializer-nameoid)))
887 (flet ((specializer-nameoid-class ()
888 (typecase specializer-nameoid
889 (symbol (find-class specializer-nameoid nil))
890 (class specializer-nameoid)
891 (class-eq-specializer
892 (specializer-class specializer-nameoid))
895 ((:primitive) `(type ,specializer-nameoid ,parameter))
897 (let ((class (specializer-nameoid-class)))
898 ;; CLASS can be null here if the user has
899 ;; erroneously tried to use a defined type as a
900 ;; specializer; it can be a non-BUILT-IN-CLASS if
901 ;; the user defines a type and calls (SETF
902 ;; FIND-CLASS) in a consistent way.
903 (when (and class (typep class 'built-in-class))
904 `(type ,specializer-nameoid ,parameter))))
906 (let ((class (specializer-nameoid-class)))
909 (if (typep class '(or built-in-class structure-class))
910 `(type ,class ,parameter)
911 ;; don't declare CLOS classes as parameters;
912 ;; it's too expensive.
915 ;; we can get here, and still not have a failure
916 ;; case, by doing MOP programming like (PROGN
917 ;; (ENSURE-CLASS 'FOO) (DEFMETHOD BAR ((X FOO))
918 ;; ...)). Best to let the user know we haven't
919 ;; been able to extract enough information:
921 "~@<can't find type for specializer ~S in ~S.~@:>"
923 'parameter-specializer-declaration-in-defmethod)
925 ((:forthcoming-defclass-type)
928 ;;; For passing a list (groveled by the walker) of the required
929 ;;; parameters whose bindings are modified in the method body to the
930 ;;; optimized-slot-value* macros.
931 (define-symbol-macro %parameter-binding-modified ())
933 (defmacro simple-lexical-method-functions ((lambda-list
939 ,method-args ,next-methods
940 (bind-simple-lexical-method-functions (,method-args ,next-methods
942 (bind-args (,lambda-list ,method-args)
945 (defmacro fast-lexical-method-functions ((lambda-list
951 `(bind-fast-lexical-method-functions (,args ,rest-arg ,next-method-call ,lmf-options)
952 (bind-args (,(nthcdr (length args) lambda-list) ,rest-arg)
955 (defmacro bind-simple-lexical-method-functions
956 ((method-args next-methods (&key call-next-method-p next-method-p-p setq-p
957 closurep applyp method-cell))
960 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
963 `(let ((.next-method. (car ,next-methods))
964 (,next-methods (cdr ,next-methods)))
965 (declare (ignorable .next-method. ,next-methods))
966 (flet (,@(and call-next-method-p
969 ,@(if (safe-code-p env)
970 `((%check-cnm-args cnm-args
975 (funcall (if (std-instance-p .next-method.)
976 (method-function .next-method.)
977 .next-method.) ; for early methods
978 (or cnm-args ,method-args)
980 (apply #'call-no-next-method
982 (or cnm-args ,method-args))))))
983 ,@(and next-method-p-p
985 (not (null .next-method.))))))
988 (defun call-no-next-method (method-cell &rest args)
989 (let ((method (car method-cell)))
991 (apply #'no-next-method (method-generic-function method)
994 (defstruct (method-call (:copier nil))
995 (function #'identity :type function)
997 (defstruct (constant-method-call (:copier nil) (:include method-call))
1000 #-sb-fluid (declaim (sb-ext:freeze-type method-call))
1002 (defmacro invoke-method-call1 (function args cm-args)
1003 `(let ((.function. ,function)
1005 (.cm-args. ,cm-args))
1006 (if (and .cm-args. (null (cdr .cm-args.)))
1007 (funcall .function. .args. (car .cm-args.))
1008 (apply .function. .args. .cm-args.))))
1010 (defmacro invoke-method-call (method-call restp &rest required-args+rest-arg)
1011 `(invoke-method-call1 (method-call-function ,method-call)
1013 `(list* ,@required-args+rest-arg)
1014 `(list ,@required-args+rest-arg))
1015 (method-call-call-method-args ,method-call)))
1017 (defstruct (fast-method-call (:copier nil))
1018 (function #'identity :type function)
1022 (defstruct (constant-fast-method-call
1023 (:copier nil) (:include fast-method-call))
1026 #-sb-fluid (declaim (sb-ext:freeze-type fast-method-call))
1028 ;; The two variants of INVOKE-FAST-METHOD-CALL differ in how REST-ARGs
1029 ;; are handled. The first one will get REST-ARG as a single list (as
1030 ;; the last argument), and will thus need to use APPLY. The second one
1031 ;; will get them as a &MORE argument, so we can pass the arguments
1032 ;; directly with MULTIPLE-VALUE-CALL and %MORE-ARG-VALUES.
1034 (defmacro invoke-fast-method-call (method-call restp &rest required-args+rest-arg)
1035 `(,(if restp 'apply 'funcall) (fast-method-call-function ,method-call)
1036 (fast-method-call-pv ,method-call)
1037 (fast-method-call-next-method-call ,method-call)
1038 ,@required-args+rest-arg))
1040 (defmacro invoke-fast-method-call/more (method-call
1043 &rest required-args)
1044 (macrolet ((generate-call (n)
1045 ``(funcall (fast-method-call-function ,method-call)
1046 (fast-method-call-pv ,method-call)
1047 (fast-method-call-next-method-call ,method-call)
1049 ,@(loop for x below ,n
1050 collect `(sb-c::%more-arg ,more-context ,x)))))
1051 ;; The cases with only small amounts of required arguments passed
1052 ;; are probably very common, and special-casing speeds them up by
1053 ;; a factor of 2 with very little effect on the other
1054 ;; cases. Though it'd be nice to have the generic case be equally
1057 (0 ,(generate-call 0))
1058 (1 ,(generate-call 1))
1059 (t (multiple-value-call (fast-method-call-function ,method-call)
1060 (values (fast-method-call-pv ,method-call))
1061 (values (fast-method-call-next-method-call ,method-call))
1063 (sb-c::%more-arg-values ,more-context 0 ,more-count))))))
1065 (defstruct (fast-instance-boundp (:copier nil))
1066 (index 0 :type fixnum))
1068 #-sb-fluid (declaim (sb-ext:freeze-type fast-instance-boundp))
1070 (eval-when (:compile-toplevel :load-toplevel :execute)
1071 (defvar *allow-emf-call-tracing-p* nil)
1072 (defvar *enable-emf-call-tracing-p* #-sb-show nil #+sb-show t))
1074 ;;;; effective method functions
1076 (defvar *emf-call-trace-size* 200)
1077 (defvar *emf-call-trace* nil)
1078 (defvar *emf-call-trace-index* 0)
1080 ;;; This function was in the CMU CL version of PCL (ca Debian 2.4.8)
1081 ;;; without explanation. It appears to be intended for debugging, so
1082 ;;; it might be useful someday, so I haven't deleted it.
1083 ;;; But it isn't documented and isn't used for anything now, so
1084 ;;; I've conditionalized it out of the base system. -- WHN 19991213
1086 (defun show-emf-call-trace ()
1087 (when *emf-call-trace*
1088 (let ((j *emf-call-trace-index*)
1089 (*enable-emf-call-tracing-p* nil))
1090 (format t "~&(The oldest entries are printed first)~%")
1091 (dotimes-fixnum (i *emf-call-trace-size*)
1092 (let ((ct (aref *emf-call-trace* j)))
1093 (when ct (print ct)))
1095 (when (= j *emf-call-trace-size*)
1098 (defun trace-emf-call-internal (emf format args)
1099 (unless *emf-call-trace*
1100 (setq *emf-call-trace* (make-array *emf-call-trace-size*)))
1101 (setf (aref *emf-call-trace* *emf-call-trace-index*)
1102 (list* emf format args))
1103 (incf *emf-call-trace-index*)
1104 (when (= *emf-call-trace-index* *emf-call-trace-size*)
1105 (setq *emf-call-trace-index* 0)))
1107 (defmacro trace-emf-call (emf format args)
1108 (when *allow-emf-call-tracing-p*
1109 `(when *enable-emf-call-tracing-p*
1110 (trace-emf-call-internal ,emf ,format ,args))))
1112 (defmacro invoke-effective-method-function-fast
1113 (emf restp &key required-args rest-arg more-arg)
1115 (trace-emf-call ,emf ,restp (list ,@required-args rest-arg))
1117 `(invoke-fast-method-call/more ,emf
1120 `(invoke-fast-method-call ,emf
1125 (defun effective-method-optimized-slot-access-clause
1126 (emf restp required-args)
1127 ;; "What," you may wonder, "do these next two clauses do?" In that
1128 ;; case, you are not a PCL implementor, for they considered this to
1129 ;; be self-documenting.:-| Or CSR, for that matter, since he can
1130 ;; also figure it out by looking at it without breaking stride. For
1131 ;; the rest of us, though: From what the code is doing with .SLOTS.
1132 ;; and whatnot, evidently it's implementing SLOT-VALUEish and
1133 ;; GET-SLOT-VALUEish things. Then we can reason backwards and
1134 ;; conclude that setting EMF to a FIXNUM is an optimized way to
1135 ;; represent these slot access operations.
1137 (let ((length (length required-args)))
1140 (let* ((.slots. (get-slots-or-nil
1141 ,(car required-args)))
1142 (value (when .slots. (clos-slots-ref .slots. ,emf))))
1143 (if (eq value +slot-unbound+)
1144 (slot-unbound-internal ,(car required-args)
1149 (let ((.new-value. ,(car required-args))
1150 (.slots. (get-slots-or-nil
1151 ,(cadr required-args))))
1153 (setf (clos-slots-ref .slots. ,emf) .new-value.)))))))
1154 ;; (In cmucl-2.4.8 there was a commented-out third ,@(WHEN
1155 ;; ...) clause here to handle SLOT-BOUNDish stuff. Since
1156 ;; there was no explanation and presumably the code is 10+
1157 ;; years stale, I simply deleted it. -- WHN)
1160 ;;; Before SBCL 0.9.16.7 instead of
1161 ;;; INVOKE-NARROW-EFFECTIVE-METHOD-FUNCTION we passed a (THE (OR
1162 ;;; FUNCTION METHOD-CALL FAST-METHOD-CALL) EMF) form as the EMF. Now,
1163 ;;; to make less work for the compiler we take a path that doesn't
1164 ;;; involve the slot-accessor clause (where EMF is a FIXNUM) at all.
1165 (macrolet ((def (name &optional narrow)
1166 `(defmacro ,name (emf restp &key required-args rest-arg more-arg)
1167 (unless (constantp restp)
1168 (error "The RESTP argument is not constant."))
1169 (setq restp (constant-form-value restp))
1170 (with-unique-names (emf-n)
1172 (declare (optimize (sb-c:insert-step-conditions 0)))
1173 (let ((,emf-n ,emf))
1174 (trace-emf-call ,emf-n ,restp (list ,@required-args ,@rest-arg))
1178 `(invoke-fast-method-call/more ,emf-n
1181 `(invoke-fast-method-call ,emf-n
1186 `(effective-method-optimized-slot-access-clause
1187 emf-n restp required-args))
1189 (invoke-method-call ,emf-n ,restp ,@required-args
1193 `(apply ,emf-n ,@required-args ,@rest-arg)
1194 `(funcall ,emf-n ,@required-args
1195 ,@rest-arg))))))))))
1196 (def invoke-effective-method-function nil)
1197 (def invoke-narrow-effective-method-function t))
1199 (defun invoke-emf (emf args)
1200 (trace-emf-call emf t args)
1203 (let* ((arg-info (fast-method-call-arg-info emf))
1204 (restp (cdr arg-info))
1205 (nreq (car arg-info)))
1207 (apply (fast-method-call-function emf)
1208 (fast-method-call-pv emf)
1209 (fast-method-call-next-method-call emf)
1213 (invoke-fast-method-call emf nil)
1214 (error 'simple-program-error
1215 :format-control "invalid number of arguments: 0"
1216 :format-arguments nil)))
1219 (invoke-fast-method-call emf nil (car args))
1220 (error 'simple-program-error
1221 :format-control "invalid number of arguments: 1"
1222 :format-arguments nil)))
1225 (invoke-fast-method-call emf nil (car args) (cadr args))
1226 (error 'simple-program-error
1227 :format-control "invalid number of arguments: 2"
1228 :format-arguments nil)))
1230 (apply (fast-method-call-function emf)
1231 (fast-method-call-pv emf)
1232 (fast-method-call-next-method-call emf)
1235 (apply (method-call-function emf)
1237 (method-call-call-method-args emf)))
1240 (error 'simple-program-error
1241 :format-control "invalid number of arguments: 0"
1242 :format-arguments nil))
1244 (let* ((slots (get-slots (car args)))
1245 (value (clos-slots-ref slots emf)))
1246 (if (eq value +slot-unbound+)
1247 (slot-unbound-internal (car args) emf)
1250 (setf (clos-slots-ref (get-slots (cadr args)) emf)
1252 (t (error 'simple-program-error
1253 :format-control "invalid number of arguments"
1254 :format-arguments nil))))
1255 (fast-instance-boundp
1256 (if (or (null args) (cdr args))
1257 (error 'simple-program-error
1258 :format-control "invalid number of arguments"
1259 :format-arguments nil)
1260 (let ((slots (get-slots (car args))))
1261 (not (eq (clos-slots-ref slots (fast-instance-boundp-index emf))
1267 (defmacro fast-call-next-method-body ((args next-method-call rest-arg)
1270 `(if ,next-method-call
1271 ,(let ((call `(invoke-narrow-effective-method-function
1273 ,(not (null rest-arg))
1274 :required-args ,args
1275 :rest-arg ,(when rest-arg (list rest-arg)))))
1279 `(&rest ,rest-arg)))
1283 (call-no-next-method ',method-cell
1288 (defmacro bind-fast-lexical-method-functions
1289 ((args rest-arg next-method-call (&key
1298 (let* ((all-params (append args (when rest-arg (list rest-arg))))
1299 (rebindings (when (or setq-p call-next-method-p)
1300 (mapcar (lambda (x) (list x x)) all-params))))
1301 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
1304 `(flet (,@(when call-next-method-p
1305 `((call-next-method (&rest cnm-args)
1306 (declare (muffle-conditions code-deletion-note)
1307 (optimize (sb-c:insert-step-conditions 0)))
1308 ,@(if (safe-code-p env)
1309 `((%check-cnm-args cnm-args (list ,@args)
1312 (fast-call-next-method-body (,args
1317 ,@(when next-method-p-p
1319 (declare (optimize (sb-c:insert-step-conditions 0)))
1320 (not (null ,next-method-call))))))
1322 ,@(when rebindings `((declare (ignorable ,@all-params))))
1325 ;;; CMUCL comment (Gerd Moellmann):
1327 ;;; The standard says it's an error if CALL-NEXT-METHOD is called with
1328 ;;; arguments, and the set of methods applicable to those arguments is
1329 ;;; different from the set of methods applicable to the original
1330 ;;; method arguments. (According to Barry Margolin, this rule was
1331 ;;; probably added to ensure that before and around methods are always
1332 ;;; run before primary methods.)
1334 ;;; This could be optimized for the case that the generic function
1335 ;;; doesn't have hairy methods, does have standard method combination,
1336 ;;; is a standard generic function, there are no methods defined on it
1337 ;;; for COMPUTE-APPLICABLE-METHODS and probably a lot more of such
1338 ;;; preconditions. That looks hairy and is probably not worth it,
1339 ;;; because this check will never be fast.
1340 (defun %check-cnm-args (cnm-args orig-args method-cell)
1342 (let* ((gf (method-generic-function (car method-cell)))
1343 (omethods (compute-applicable-methods gf orig-args))
1344 (nmethods (compute-applicable-methods gf cnm-args)))
1345 (unless (equal omethods nmethods)
1346 (error "~@<The set of methods ~S applicable to argument~P ~
1347 ~{~S~^, ~} to call-next-method is different from ~
1348 the set of methods ~S applicable to the original ~
1349 method argument~P ~{~S~^, ~}.~@:>"
1350 nmethods (length cnm-args) cnm-args omethods
1351 (length orig-args) orig-args)))))
1353 (defmacro bind-args ((lambda-list args) &body body)
1354 (let ((args-tail '.args-tail.)
1357 (flet ((process-var (var)
1358 (if (memq var lambda-list-keywords)
1361 (&optional (setq state 'optional))
1362 (&key (setq state 'key))
1364 (&rest (setq state 'rest))
1365 (&aux (setq state 'aux))
1368 "encountered the non-standard lambda list keyword ~S"
1372 (required `((,var (pop ,args-tail))))
1373 (optional (cond ((not (consp var))
1374 `((,var (when ,args-tail
1375 (pop ,args-tail)))))
1377 `((,(car var) (if ,args-tail
1381 `((,(caddr var) (not (null ,args-tail)))
1382 (,(car var) (if ,args-tail
1385 (rest `((,var ,args-tail)))
1386 (key (cond ((not (consp var))
1388 (get-key-arg-tail ,(keywordicate var)
1391 (multiple-value-bind (keyword variable)
1392 (if (consp (car var))
1395 (values (keywordicate (car var))
1397 `((,key (get-key-arg-tail ',keyword
1403 (multiple-value-bind (keyword variable)
1404 (if (consp (car var))
1407 (values (keywordicate (car var))
1409 `((,key (get-key-arg-tail ',keyword
1411 (,(caddr var) (not (null,key)))
1416 (let ((bindings (mapcan #'process-var lambda-list)))
1417 `(let* ((,args-tail ,args)
1420 ,@(when (eq state 'optional)
1421 `((unless (null ,args-tail)
1422 (error 'simple-program-error
1423 :format-control "surplus arguments: ~S"
1424 :format-arguments (list ,args-tail)))))))
1425 (declare (ignorable ,args-tail .dummy0.))
1428 (defun get-key-arg-tail (keyword list)
1429 (loop for (key . tail) on list by #'cddr
1431 ;; FIXME: Do we want to export this symbol? Or maybe use an
1432 ;; (ERROR 'SIMPLE-PROGRAM-ERROR) form?
1433 (sb-c::%odd-key-args-error)
1434 when (eq key keyword)
1437 (defun walk-method-lambda (method-lambda required-parameters env slots)
1438 (let (;; flag indicating that CALL-NEXT-METHOD should be in the
1439 ;; method definition
1440 (call-next-method-p nil)
1441 ;; flag indicating that #'CALL-NEXT-METHOD was seen in the
1444 ;; flag indicating that NEXT-METHOD-P should be in the method
1446 (next-method-p-p nil)
1447 ;; a list of all required parameters whose bindings might be
1448 ;; modified in the method body.
1449 (parameters-setqd nil))
1450 (flet ((walk-function (form context env)
1451 (cond ((not (eq context :eval)) form)
1452 ;; FIXME: Jumping to a conclusion from the way it's used
1453 ;; above, perhaps CONTEXT should be called SITUATION
1454 ;; (after the term used in the ANSI specification of
1455 ;; EVAL-WHEN) and given modern ANSI keyword values
1456 ;; like :LOAD-TOPLEVEL.
1457 ((not (listp form)) form)
1458 ((eq (car form) 'call-next-method)
1459 (setq call-next-method-p t)
1461 ((eq (car form) 'next-method-p)
1462 (setq next-method-p-p t)
1464 ((memq (car form) '(setq multiple-value-setq))
1465 ;; FIXME: this is possibly a little strong as
1466 ;; conditions go. Ideally we would want to detect
1467 ;; which, if any, of the method parameters are
1468 ;; being set, and communicate that information to
1469 ;; e.g. SPLIT-DECLARATIONS. However, the brute
1470 ;; force method doesn't really cost much; a little
1471 ;; loss of discrimination over IGNORED variables
1472 ;; should be all. -- CSR, 2004-07-01
1474 ;; As of 2006-09-18 modified parameter bindings
1475 ;; are now tracked with more granularity than just
1476 ;; one SETQ-P flag, in order to disable SLOT-VALUE
1477 ;; optimizations for parameters that are SETQd.
1478 ;; The old binary SETQ-P flag is still used for
1479 ;; all other purposes, since as noted above, the
1480 ;; extra cost is minimal. -- JES, 2006-09-18
1482 ;; The walker will split (SETQ A 1 B 2) to
1483 ;; separate (SETQ A 1) and (SETQ B 2) forms, so we
1484 ;; only need to handle the simple case of SETQ
1486 (let ((vars (if (eq (car form) 'setq)
1487 (list (second form))
1490 ;; Note that we don't need to check for
1491 ;; %VARIABLE-REBINDING declarations like is
1492 ;; done in CAN-OPTIMIZE-ACCESS1, since the
1493 ;; bindings that will have that declation will
1495 (when (var-declaration '%class var env)
1496 ;; If a parameter binding is shadowed by
1497 ;; another binding it won't have a %CLASS
1498 ;; declaration anymore, and this won't get
1500 (pushnew var parameters-setqd :test #'eq))))
1502 ((and (eq (car form) 'function)
1503 (cond ((eq (cadr form) 'call-next-method)
1504 (setq call-next-method-p t)
1507 ((eq (cadr form) 'next-method-p)
1508 (setq next-method-p-p t)
1512 ((and (memq (car form)
1513 '(slot-value set-slot-value slot-boundp))
1514 (constantp (caddr form) env))
1515 (let ((fun (ecase (car form)
1516 (slot-value #'optimize-slot-value)
1517 (set-slot-value #'optimize-set-slot-value)
1518 (slot-boundp #'optimize-slot-boundp))))
1519 (funcall fun form slots required-parameters env)))
1522 (let ((walked-lambda (walk-form method-lambda env #'walk-function)))
1523 ;;; FIXME: the walker's rewriting of the source code causes
1524 ;;; trouble when doing code coverage. The rewrites should be
1525 ;;; removed, and the same operations done using
1526 ;;; compiler-macros or tranforms.
1527 (values (if (sb-c:policy env (= sb-c:store-coverage-data 0))
1533 (not (null parameters-setqd))
1534 parameters-setqd)))))
1536 (defun generic-function-name-p (name)
1537 (and (legal-fun-name-p name)
1539 (if (eq *boot-state* 'complete)
1540 (standard-generic-function-p (gdefinition name))
1541 (funcallable-instance-p (gdefinition name)))))
1543 (defun method-plist-value (method key &optional default)
1544 (let ((plist (if (consp method)
1545 (getf (early-method-initargs method) 'plist)
1546 (object-plist method))))
1547 (getf plist key default)))
1549 (defun (setf method-plist-value) (new-value method key &optional default)
1551 (setf (getf (getf (early-method-initargs method) 'plist) key default)
1553 (setf (getf (object-plist method) key default) new-value)))
1555 (defun load-defmethod (class name quals specls ll initargs source-location)
1556 (let ((method-cell (getf initargs 'method-cell)))
1557 (setq initargs (copy-tree initargs))
1559 (setf (getf initargs 'method-cell) method-cell))
1561 (setf (getf (getf initargs 'plist) :name)
1562 (make-method-spec name quals specls))
1563 (load-defmethod-internal class name quals specls
1564 ll initargs source-location)))
1566 (defun load-defmethod-internal
1567 (method-class gf-spec qualifiers specializers lambda-list
1568 initargs source-location)
1569 (when (and (eq *boot-state* 'complete)
1571 (let* ((gf (fdefinition gf-spec))
1572 (method (and (generic-function-p gf)
1573 (generic-function-methods gf)
1574 (find-method gf qualifiers specializers nil))))
1576 (style-warn 'sb-kernel:redefinition-with-defmethod
1577 :generic-function gf-spec :old-method method
1578 :qualifiers qualifiers :specializers specializers
1579 :new-location source-location))))
1580 (let ((method (apply #'add-named-method
1581 gf-spec qualifiers specializers lambda-list
1582 :definition-source source-location
1584 (unless (or (eq method-class 'standard-method)
1585 (eq (find-class method-class nil) (class-of method)))
1586 ;; FIXME: should be STYLE-WARNING?
1587 (format *error-output*
1588 "~&At the time the method with qualifiers ~:S and~%~
1589 specializers ~:S on the generic function ~S~%~
1590 was compiled, the method-class for that generic function was~%~
1591 ~S. But, the method class is now ~S, this~%~
1592 may mean that this method was compiled improperly.~%"
1593 qualifiers specializers gf-spec
1594 method-class (class-name (class-of method))))
1597 (defun make-method-spec (gf qualifiers specializers)
1598 (let ((name (generic-function-name gf))
1599 (unparsed-specializers (unparse-specializers gf specializers)))
1600 `(slow-method ,name ,@qualifiers ,unparsed-specializers)))
1602 (defun initialize-method-function (initargs method)
1603 (let* ((mf (getf initargs :function))
1604 (mff (and (typep mf '%method-function)
1605 (%method-function-fast-function mf)))
1606 (plist (getf initargs 'plist))
1607 (name (getf plist :name))
1608 (method-cell (getf initargs 'method-cell)))
1610 (setf (car method-cell) method))
1613 (setq mf (set-fun-name mf name)))
1614 (when (and mff (consp name) (eq (car name) 'slow-method))
1615 (let ((fast-name `(fast-method ,@(cdr name))))
1616 (set-fun-name mff fast-name))))
1618 (let ((plist plist))
1619 (let ((snl (getf plist :slot-name-lists)))
1621 (setf (method-plist-value method :pv-table)
1622 (intern-pv-table :slot-name-lists snl))))))))
1624 (defun analyze-lambda-list (lambda-list)
1625 (flet (;; FIXME: Is this redundant with SB-C::MAKE-KEYWORD-FOR-ARG?
1626 (parse-key-arg (arg)
1628 (if (listp (car arg))
1630 (keywordicate (car arg)))
1631 (keywordicate arg))))
1637 (allow-other-keys-p nil)
1639 (keyword-parameters ())
1641 (dolist (x lambda-list)
1642 (if (memq x lambda-list-keywords)
1644 (&optional (setq state 'optional))
1647 (&allow-other-keys (setq allow-other-keys-p t))
1648 (&rest (setq restp t
1652 (error "encountered the non-standard lambda list keyword ~S"
1655 (required (incf nrequired))
1656 (optional (incf noptional))
1657 (key (push (parse-key-arg x) keywords)
1658 (push x keyword-parameters))
1659 (rest (incf nrest)))))
1660 (when (and restp (zerop nrest))
1661 (error "Error in lambda-list:~%~
1662 After &REST, a DEFGENERIC lambda-list ~
1663 must be followed by at least one variable."))
1664 (values nrequired noptional keysp restp allow-other-keys-p
1666 (reverse keyword-parameters)))))
1668 (defun keyword-spec-name (x)
1669 (let ((key (if (atom x) x (car x))))
1674 (defun ftype-declaration-from-lambda-list (lambda-list name)
1675 (multiple-value-bind (nrequired noptional keysp restp allow-other-keys-p
1676 keywords keyword-parameters)
1677 (analyze-lambda-list lambda-list)
1678 (declare (ignore keyword-parameters))
1679 (let* ((old (info :function :type name)) ;FIXME:FDOCUMENTATION instead?
1680 (old-ftype (if (fun-type-p old) old nil))
1681 (old-restp (and old-ftype (fun-type-rest old-ftype)))
1682 (old-keys (and old-ftype
1683 (mapcar #'key-info-name
1686 (old-keysp (and old-ftype (fun-type-keyp old-ftype)))
1687 (old-allowp (and old-ftype
1688 (fun-type-allowp old-ftype)))
1689 (keywords (union old-keys (mapcar #'keyword-spec-name keywords))))
1690 `(function ,(append (make-list nrequired :initial-element t)
1691 (when (plusp noptional)
1692 (append '(&optional)
1693 (make-list noptional :initial-element t)))
1694 (when (or restp old-restp)
1696 (when (or keysp old-keysp)
1698 (mapcar (lambda (key)
1701 (when (or allow-other-keys-p old-allowp)
1702 '(&allow-other-keys)))))
1705 (defun defgeneric-declaration (spec lambda-list)
1706 `(ftype ,(ftype-declaration-from-lambda-list lambda-list spec) ,spec))
1708 ;;;; early generic function support
1710 (defvar *!early-generic-functions* ())
1712 (defun ensure-generic-function (fun-name
1714 &key environment source-location
1716 (declare (ignore environment))
1717 (let ((existing (and (fboundp fun-name)
1718 (gdefinition fun-name))))
1719 (cond ((and existing
1720 (eq *boot-state* 'complete)
1721 (null (generic-function-p existing)))
1722 (generic-clobbers-function fun-name)
1723 (fmakunbound fun-name)
1724 (apply #'ensure-generic-function fun-name all-keys))
1726 (apply #'ensure-generic-function-using-class
1727 existing fun-name all-keys)))))
1729 (defun generic-clobbers-function (fun-name)
1730 (cerror "Replace the function binding"
1731 'simple-program-error
1732 :format-control "~S already names an ordinary function or a macro."
1733 :format-arguments (list fun-name)))
1735 (defvar *sgf-wrapper*
1736 (boot-make-wrapper (early-class-size 'standard-generic-function)
1737 'standard-generic-function))
1739 (defvar *sgf-slots-init*
1740 (mapcar (lambda (canonical-slot)
1741 (if (memq (getf canonical-slot :name) '(arg-info source))
1743 (let ((initfunction (getf canonical-slot :initfunction)))
1745 (funcall initfunction)
1747 (early-collect-inheritance 'standard-generic-function)))
1749 (defvar *sgf-method-class-index*
1750 (!bootstrap-slot-index 'standard-generic-function 'method-class))
1752 (defun early-gf-p (x)
1753 (and (fsc-instance-p x)
1754 (eq (clos-slots-ref (get-slots x) *sgf-method-class-index*)
1757 (defvar *sgf-methods-index*
1758 (!bootstrap-slot-index 'standard-generic-function 'methods))
1760 (defmacro early-gf-methods (gf)
1761 `(clos-slots-ref (get-slots ,gf) *sgf-methods-index*))
1763 (defun safe-generic-function-methods (generic-function)
1764 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
1765 (clos-slots-ref (get-slots generic-function) *sgf-methods-index*)
1766 (generic-function-methods generic-function)))
1768 (defvar *sgf-arg-info-index*
1769 (!bootstrap-slot-index 'standard-generic-function 'arg-info))
1771 (defmacro early-gf-arg-info (gf)
1772 `(clos-slots-ref (get-slots ,gf) *sgf-arg-info-index*))
1774 (defvar *sgf-dfun-state-index*
1775 (!bootstrap-slot-index 'standard-generic-function 'dfun-state))
1777 (defstruct (arg-info
1779 (:constructor make-arg-info ())
1781 (arg-info-lambda-list :no-lambda-list)
1784 arg-info-number-optional
1786 arg-info-keys ;nil no &KEY or &REST allowed
1787 ;(k1 k2 ..) Each method must accept these &KEY arguments.
1788 ;T must have &KEY or &REST
1790 gf-info-simple-accessor-type ; nil, reader, writer, boundp
1791 (gf-precompute-dfun-and-emf-p nil) ; set by set-arg-info
1793 gf-info-static-c-a-m-emf
1794 (gf-info-c-a-m-emf-std-p t)
1797 #-sb-fluid (declaim (sb-ext:freeze-type arg-info))
1799 (defun arg-info-valid-p (arg-info)
1800 (not (null (arg-info-number-optional arg-info))))
1802 (defun arg-info-applyp (arg-info)
1803 (or (plusp (arg-info-number-optional arg-info))
1804 (arg-info-key/rest-p arg-info)))
1806 (defun arg-info-number-required (arg-info)
1807 (length (arg-info-metatypes arg-info)))
1809 (defun arg-info-nkeys (arg-info)
1810 (count-if (lambda (x) (neq x t)) (arg-info-metatypes arg-info)))
1812 (defun create-gf-lambda-list (lambda-list)
1813 ;;; Create a gf lambda list from a method lambda list
1814 (loop for x in lambda-list
1815 collect (if (consp x) (list (car x)) x)
1816 if (eq x '&key) do (loop-finish)))
1818 (defun set-arg-info (gf &key new-method (lambda-list nil lambda-list-p)
1819 argument-precedence-order)
1820 (let* ((arg-info (if (eq *boot-state* 'complete)
1822 (early-gf-arg-info gf)))
1823 (methods (if (eq *boot-state* 'complete)
1824 (generic-function-methods gf)
1825 (early-gf-methods gf)))
1826 (was-valid-p (integerp (arg-info-number-optional arg-info)))
1827 (first-p (and new-method (null (cdr methods)))))
1828 (when (and (not lambda-list-p) methods)
1829 (setq lambda-list (gf-lambda-list gf)))
1830 (when (or lambda-list-p
1832 (eq (arg-info-lambda-list arg-info) :no-lambda-list)))
1833 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1834 (analyze-lambda-list lambda-list)
1835 (when (and methods (not first-p))
1836 (let ((gf-nreq (arg-info-number-required arg-info))
1837 (gf-nopt (arg-info-number-optional arg-info))
1838 (gf-key/rest-p (arg-info-key/rest-p arg-info)))
1839 (unless (and (= nreq gf-nreq)
1841 (eq (or keysp restp) gf-key/rest-p))
1842 (error "The lambda-list ~S is incompatible with ~
1843 existing methods of ~S."
1845 (setf (arg-info-lambda-list arg-info)
1848 (create-gf-lambda-list lambda-list)))
1849 (when (or lambda-list-p argument-precedence-order
1850 (null (arg-info-precedence arg-info)))
1851 (setf (arg-info-precedence arg-info)
1852 (compute-precedence lambda-list nreq argument-precedence-order)))
1853 (setf (arg-info-metatypes arg-info) (make-list nreq))
1854 (setf (arg-info-number-optional arg-info) nopt)
1855 (setf (arg-info-key/rest-p arg-info) (not (null (or keysp restp))))
1856 (setf (arg-info-keys arg-info)
1858 (if allow-other-keys-p t keywords)
1859 (arg-info-key/rest-p arg-info)))))
1861 (check-method-arg-info gf arg-info new-method))
1862 (set-arg-info1 gf arg-info new-method methods was-valid-p first-p)
1865 (defun check-method-arg-info (gf arg-info method)
1866 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1867 (analyze-lambda-list (if (consp method)
1868 (early-method-lambda-list method)
1869 (method-lambda-list method)))
1870 (flet ((lose (string &rest args)
1871 (error 'simple-program-error
1872 :format-control "~@<attempt to add the method~2I~_~S~I~_~
1873 to the generic function~2I~_~S;~I~_~
1875 :format-arguments (list method gf string args)))
1876 (comparison-description (x y)
1877 (if (> x y) "more" "fewer")))
1878 (let ((gf-nreq (arg-info-number-required arg-info))
1879 (gf-nopt (arg-info-number-optional arg-info))
1880 (gf-key/rest-p (arg-info-key/rest-p arg-info))
1881 (gf-keywords (arg-info-keys arg-info)))
1882 (unless (= nreq gf-nreq)
1884 "the method has ~A required arguments than the generic function."
1885 (comparison-description nreq gf-nreq)))
1886 (unless (= nopt gf-nopt)
1888 "the method has ~A optional arguments than the generic function."
1889 (comparison-description nopt gf-nopt)))
1890 (unless (eq (or keysp restp) gf-key/rest-p)
1892 "the method and generic function differ in whether they accept~_~
1893 &REST or &KEY arguments."))
1894 (when (consp gf-keywords)
1895 (unless (or (and restp (not keysp))
1897 (every (lambda (k) (memq k keywords)) gf-keywords))
1898 (lose "the method does not accept each of the &KEY arguments~2I~_~
1902 (defvar *sm-specializers-index*
1903 (!bootstrap-slot-index 'standard-method 'specializers))
1904 (defvar *sm-%function-index*
1905 (!bootstrap-slot-index 'standard-method '%function))
1906 (defvar *sm-qualifiers-index*
1907 (!bootstrap-slot-index 'standard-method 'qualifiers))
1908 (defvar *sm-plist-index*
1909 (!bootstrap-slot-index 'standard-method 'plist))
1911 ;;; FIXME: we don't actually need this; we could test for the exact
1912 ;;; class and deal with it as appropriate. In fact we probably don't
1913 ;;; need it anyway because we only use this for METHOD-SPECIALIZERS on
1914 ;;; the standard reader method for METHOD-SPECIALIZERS. Probably.
1915 (dolist (s '(specializers %function plist))
1916 (aver (= (symbol-value (intern (format nil "*SM-~A-INDEX*" s)))
1917 (!bootstrap-slot-index 'standard-reader-method s)
1918 (!bootstrap-slot-index 'standard-writer-method s)
1919 (!bootstrap-slot-index 'standard-boundp-method s)
1920 (!bootstrap-slot-index 'global-reader-method s)
1921 (!bootstrap-slot-index 'global-writer-method s)
1922 (!bootstrap-slot-index 'global-boundp-method s))))
1924 (define-symbol-macro *standard-method-classes*
1925 (list *the-class-standard-method* *the-class-standard-reader-method*
1926 *the-class-standard-writer-method* *the-class-standard-boundp-method*
1927 *the-class-global-reader-method* *the-class-global-writer-method*
1928 *the-class-global-boundp-method*))
1930 (defun safe-method-specializers (method)
1931 (let ((standard-method-classes *standard-method-classes*)
1932 (class (class-of method)))
1933 (if (member class standard-method-classes)
1934 (clos-slots-ref (get-slots method) *sm-specializers-index*)
1935 (method-specializers method))))
1936 (defun safe-method-fast-function (method)
1937 (let ((mf (safe-method-function method)))
1938 (and (typep mf '%method-function)
1939 (%method-function-fast-function mf))))
1940 (defun safe-method-function (method)
1941 (let ((standard-method-classes *standard-method-classes*)
1942 (class (class-of method)))
1943 (if (member class standard-method-classes)
1944 (clos-slots-ref (get-slots method) *sm-%function-index*)
1945 (method-function method))))
1946 (defun safe-method-qualifiers (method)
1947 (let ((standard-method-classes *standard-method-classes*)
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 (not (eq package #.(find-package "CL")))
2015 ;; FIXME: this test will eventually be
2016 ;; superseded by the *internal-pcl...* test,
2017 ;; above. While we are in a process of
2018 ;; transition, however, it should probably
2020 (not (find #\Space (symbol-name symbol))))))))))
2021 (setf (gf-info-fast-mf-p arg-info)
2022 (or (not (eq *boot-state* 'complete))
2023 (let* ((method-class (generic-function-method-class gf))
2024 (methods (compute-applicable-methods
2025 #'make-method-lambda
2026 (list gf (class-prototype method-class)
2028 (and methods (null (cdr methods))
2029 (let ((specls (method-specializers (car methods))))
2030 (and (classp (car specls))
2031 (eq 'standard-generic-function
2032 (class-name (car specls)))
2033 (classp (cadr specls))
2034 (eq 'standard-method
2035 (class-name (cadr specls)))))))))
2038 ;;; This is the early definition of ENSURE-GENERIC-FUNCTION-USING-CLASS.
2040 ;;; The STATIC-SLOTS field of the funcallable instances used as early
2041 ;;; generic functions is used to store the early methods and early
2042 ;;; discriminator code for the early generic function. The static
2043 ;;; slots field of the fins contains a list whose:
2044 ;;; CAR - a list of the early methods on this early gf
2045 ;;; CADR - the early discriminator code for this method
2046 (defun ensure-generic-function-using-class (existing spec &rest keys
2047 &key (lambda-list nil
2049 argument-precedence-order
2053 (declare (ignore keys))
2054 (cond ((and existing (early-gf-p existing))
2056 (set-arg-info existing :lambda-list lambda-list))
2058 ((assoc spec *!generic-function-fixups* :test #'equal)
2060 (make-early-gf spec lambda-list lambda-list-p existing
2061 argument-precedence-order source-location
2063 (bug "The function ~S is not already defined." spec)))
2065 (bug "~S should be on the list ~S."
2066 spec '*!generic-function-fixups*))
2068 (pushnew spec *!early-generic-functions* :test #'equal)
2069 (make-early-gf spec lambda-list lambda-list-p nil
2070 argument-precedence-order source-location
2073 (defun make-early-gf (spec &optional lambda-list lambda-list-p
2074 function argument-precedence-order source-location
2076 (let ((fin (allocate-standard-funcallable-instance
2077 *sgf-wrapper* *sgf-slots-init*)))
2078 (set-funcallable-instance-function
2081 (if (eq spec 'print-object)
2082 #'(lambda (instance stream)
2083 (print-unreadable-object (instance stream :identity t)
2084 (format stream "std-instance")))
2085 #'(lambda (&rest args)
2086 (declare (ignore args))
2087 (error "The function of the funcallable-instance ~S~
2088 has not been set." fin)))))
2089 (setf (gdefinition spec) fin)
2090 (!bootstrap-set-slot 'standard-generic-function fin 'name spec)
2091 (!bootstrap-set-slot 'standard-generic-function fin
2092 'source source-location)
2093 (!bootstrap-set-slot 'standard-generic-function fin
2094 '%documentation documentation)
2095 (set-fun-name fin spec)
2096 (let ((arg-info (make-arg-info)))
2097 (setf (early-gf-arg-info fin) arg-info)
2099 (proclaim (defgeneric-declaration spec lambda-list))
2100 (if argument-precedence-order
2102 :lambda-list lambda-list
2103 :argument-precedence-order argument-precedence-order)
2104 (set-arg-info fin :lambda-list lambda-list))))
2107 (defun safe-gf-dfun-state (generic-function)
2108 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2109 (clos-slots-ref (get-slots generic-function) *sgf-dfun-state-index*)
2110 (gf-dfun-state generic-function)))
2111 (defun (setf safe-gf-dfun-state) (new-value generic-function)
2112 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2113 (setf (clos-slots-ref (get-slots generic-function)
2114 *sgf-dfun-state-index*)
2116 (setf (gf-dfun-state generic-function) new-value)))
2118 (defun set-dfun (gf &optional dfun cache info)
2119 (let ((new-state (if (and dfun (or cache info))
2120 (list* dfun cache info)
2123 ((eq *boot-state* 'complete)
2124 ;; Check that we are under the lock.
2126 (aver (eq sb-thread:*current-thread* (sb-thread::spinlock-value (gf-lock gf))))
2127 (setf (safe-gf-dfun-state gf) new-state))
2129 (setf (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*)
2133 (defun gf-dfun-cache (gf)
2134 (let ((state (if (eq *boot-state* 'complete)
2135 (safe-gf-dfun-state gf)
2136 (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*))))
2139 (cons (cadr state)))))
2141 (defun gf-dfun-info (gf)
2142 (let ((state (if (eq *boot-state* 'complete)
2143 (safe-gf-dfun-state gf)
2144 (clos-slots-ref (get-slots gf) *sgf-dfun-state-index*))))
2147 (cons (cddr state)))))
2149 (defvar *sgf-name-index*
2150 (!bootstrap-slot-index 'standard-generic-function 'name))
2152 (defun !early-gf-name (gf)
2153 (clos-slots-ref (get-slots gf) *sgf-name-index*))
2155 (defun gf-lambda-list (gf)
2156 (let ((arg-info (if (eq *boot-state* 'complete)
2158 (early-gf-arg-info gf))))
2159 (if (eq :no-lambda-list (arg-info-lambda-list arg-info))
2160 (let ((methods (if (eq *boot-state* 'complete)
2161 (generic-function-methods gf)
2162 (early-gf-methods gf))))
2165 (warn "no way to determine the lambda list for ~S" gf)
2167 (let* ((method (car (last methods)))
2168 (ll (if (consp method)
2169 (early-method-lambda-list method)
2170 (method-lambda-list method))))
2171 (create-gf-lambda-list ll))))
2172 (arg-info-lambda-list arg-info))))
2174 (defmacro real-ensure-gf-internal (gf-class all-keys env)
2176 (cond ((symbolp ,gf-class)
2177 (setq ,gf-class (find-class ,gf-class t ,env)))
2178 ((classp ,gf-class))
2180 (error "The :GENERIC-FUNCTION-CLASS argument (~S) was neither a~%~
2181 class nor a symbol that names a class."
2183 (unless (class-finalized-p ,gf-class)
2184 (if (class-has-a-forward-referenced-superclass-p ,gf-class)
2185 ;; FIXME: reference MOP documentation -- this is an
2186 ;; additional requirement on our users
2187 (error "The generic function class ~S is not finalizeable" ,gf-class)
2188 (finalize-inheritance ,gf-class)))
2189 (remf ,all-keys :generic-function-class)
2190 (remf ,all-keys :environment)
2191 (let ((combin (getf ,all-keys :method-combination '.shes-not-there.)))
2192 (unless (eq combin '.shes-not-there.)
2193 (setf (getf ,all-keys :method-combination)
2194 (find-method-combination (class-prototype ,gf-class)
2197 (let ((method-class (getf ,all-keys :method-class '.shes-not-there.)))
2198 (unless (eq method-class '.shes-not-there.)
2199 (setf (getf ,all-keys :method-class)
2200 (cond ((classp method-class)
2202 (t (find-class method-class t ,env))))))))
2204 (defun real-ensure-gf-using-class--generic-function
2208 &key environment (lambda-list nil lambda-list-p)
2209 (generic-function-class 'standard-generic-function)
2211 (real-ensure-gf-internal generic-function-class all-keys environment)
2212 ;; KLUDGE: the above macro does SETQ on GENERIC-FUNCTION-CLASS,
2213 ;; which is what makes the next line work
2214 (unless (eq (class-of existing) generic-function-class)
2215 (change-class existing generic-function-class))
2217 (apply #'reinitialize-instance existing all-keys)
2219 (proclaim (defgeneric-declaration fun-name lambda-list)))))
2221 (defun real-ensure-gf-using-class--null
2225 &key environment (lambda-list nil lambda-list-p)
2226 (generic-function-class 'standard-generic-function)
2228 (declare (ignore existing))
2229 (real-ensure-gf-internal generic-function-class all-keys environment)
2231 (setf (gdefinition fun-name)
2232 (apply #'make-instance generic-function-class
2233 :name fun-name all-keys))
2235 (proclaim (defgeneric-declaration fun-name lambda-list)))))
2237 (defun safe-gf-arg-info (generic-function)
2238 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2239 (clos-slots-ref (fsc-instance-slots generic-function)
2240 *sgf-arg-info-index*)
2241 (gf-arg-info generic-function)))
2243 ;;; FIXME: this function took on a slightly greater role than it
2244 ;;; previously had around 2005-11-02, when CSR fixed the bug whereby
2245 ;;; having more than one subclass of standard-generic-function caused
2246 ;;; the whole system to die horribly through a metacircle in
2247 ;;; GF-ARG-INFO. The fix is to be slightly more disciplined about
2248 ;;; calling accessor methods -- we call GET-GENERIC-FUN-INFO when
2249 ;;; computing discriminating functions, so we need to be careful about
2250 ;;; having a base case for the recursion, and we provide that with the
2251 ;;; STANDARD-GENERIC-FUNCTION case below. However, we are not (yet)
2252 ;;; as disciplined as CLISP's CLOS/MOP, and it would be nice to get to
2253 ;;; that stage, where all potentially dangerous cases are enumerated
2254 ;;; and stopped. -- CSR, 2005-11-02.
2255 (defun get-generic-fun-info (gf)
2256 ;; values nreq applyp metatypes nkeys arg-info
2257 (multiple-value-bind (applyp metatypes arg-info)
2258 (let* ((arg-info (if (early-gf-p gf)
2259 (early-gf-arg-info gf)
2260 (safe-gf-arg-info gf)))
2261 (metatypes (arg-info-metatypes arg-info)))
2262 (values (arg-info-applyp arg-info)
2265 (values (length metatypes) applyp metatypes
2266 (count-if (lambda (x) (neq x t)) metatypes)
2269 (defun early-make-a-method (class qualifiers arglist specializers initargs doc
2270 &key slot-name object-class method-class-function
2274 ;; Figure out whether we got class objects or class names as the
2275 ;; specializers and set parsed and unparsed appropriately. If we
2276 ;; got class objects, then we can compute unparsed, but if we got
2277 ;; class names we don't try to compute parsed.
2279 ;; Note that the use of not symbolp in this call to every should be
2280 ;; read as 'classp' we can't use classp itself because it doesn't
2282 (if (every (lambda (s) (not (symbolp s))) specializers)
2283 (setq parsed specializers
2284 unparsed (mapcar (lambda (s)
2285 (if (eq s t) t (class-name s)))
2287 (setq unparsed specializers
2292 (getf initargs :function)
2293 (let ((mf (getf initargs :function)))
2295 (and (typep mf '%method-function)
2296 (%method-function-fast-function mf)))
2298 ;; the parsed specializers. This is used by
2299 ;; EARLY-METHOD-SPECIALIZERS to cache the parse.
2300 ;; Note that this only comes into play when there is
2301 ;; more than one early method on an early gf.
2304 ;; A list to which REAL-MAKE-A-METHOD can be applied
2305 ;; to make a real method corresponding to this early
2308 (list class qualifiers arglist unparsed
2311 (list :slot-name slot-name :object-class object-class
2312 :method-class-function method-class-function))
2313 (list :definition-source definition-source)))))
2314 (initialize-method-function initargs result)
2317 (defun real-make-a-method
2318 (class qualifiers lambda-list specializers initargs doc
2319 &rest args &key slot-name object-class method-class-function
2321 (if method-class-function
2322 (let* ((object-class (if (classp object-class) object-class
2323 (find-class object-class)))
2324 (slots (class-direct-slots object-class))
2325 (slot-definition (find slot-name slots
2326 :key #'slot-definition-name)))
2328 (aver slot-definition)
2329 (let ((initargs (list* :qualifiers qualifiers :lambda-list lambda-list
2330 :specializers specializers :documentation doc
2331 :slot-definition slot-definition
2332 :slot-name slot-name initargs)))
2333 (apply #'make-instance
2334 (apply method-class-function object-class slot-definition
2336 :definition-source definition-source
2338 (apply #'make-instance class :qualifiers qualifiers
2339 :lambda-list lambda-list :specializers specializers
2340 :documentation doc (append args initargs))))
2342 (defun early-method-function (early-method)
2343 (values (cadr early-method) (caddr early-method)))
2345 (defun early-method-class (early-method)
2346 (find-class (car (fifth early-method))))
2348 (defun early-method-standard-accessor-p (early-method)
2349 (let ((class (first (fifth early-method))))
2350 (or (eq class 'standard-reader-method)
2351 (eq class 'standard-writer-method)
2352 (eq class 'standard-boundp-method))))
2354 (defun early-method-standard-accessor-slot-name (early-method)
2355 (eighth (fifth early-method)))
2357 ;;; Fetch the specializers of an early method. This is basically just
2358 ;;; a simple accessor except that when the second argument is t, this
2359 ;;; converts the specializers from symbols into class objects. The
2360 ;;; class objects are cached in the early method, this makes
2361 ;;; bootstrapping faster because the class objects only have to be
2365 ;;; The second argument should only be passed as T by
2366 ;;; early-lookup-method. This is to implement the rule that only when
2367 ;;; there is more than one early method on a generic function is the
2368 ;;; conversion from class names to class objects done. This
2369 ;;; corresponds to the fact that we are only allowed to have one
2370 ;;; method on any generic function up until the time classes exist.
2371 (defun early-method-specializers (early-method &optional objectsp)
2372 (if (and (listp early-method)
2373 (eq (car early-method) :early-method))
2374 (cond ((eq objectsp t)
2375 (or (fourth early-method)
2376 (setf (fourth early-method)
2377 (mapcar #'find-class (cadddr (fifth early-method))))))
2379 (fourth (fifth early-method))))
2380 (error "~S is not an early-method." early-method)))
2382 (defun early-method-qualifiers (early-method)
2383 (second (fifth early-method)))
2385 (defun early-method-lambda-list (early-method)
2386 (third (fifth early-method)))
2388 (defun early-method-initargs (early-method)
2389 (fifth (fifth early-method)))
2391 (defun (setf early-method-initargs) (new-value early-method)
2392 (setf (fifth (fifth early-method)) new-value))
2394 (defun early-add-named-method (generic-function-name qualifiers
2395 specializers arglist &rest initargs
2396 &key documentation definition-source
2398 (let* (;; we don't need to deal with the :generic-function-class
2399 ;; argument here because the default,
2400 ;; STANDARD-GENERIC-FUNCTION, is right for all early generic
2401 ;; functions. (See REAL-ADD-NAMED-METHOD)
2402 (gf (ensure-generic-function generic-function-name))
2404 (dolist (m (early-gf-methods gf))
2405 (when (and (equal (early-method-specializers m) specializers)
2406 (equal (early-method-qualifiers m) qualifiers))
2408 (setf (getf (getf initargs 'plist) :name)
2409 (make-method-spec gf qualifiers specializers))
2410 (let ((new (make-a-method 'standard-method qualifiers arglist
2411 specializers initargs documentation
2412 :definition-source definition-source)))
2413 (when existing (remove-method gf existing))
2414 (add-method gf new))))
2416 ;;; This is the early version of ADD-METHOD. Later this will become a
2417 ;;; generic function. See !FIX-EARLY-GENERIC-FUNCTIONS which has
2418 ;;; special knowledge about ADD-METHOD.
2419 (defun add-method (generic-function method)
2420 (when (not (fsc-instance-p generic-function))
2421 (error "Early ADD-METHOD didn't get a funcallable instance."))
2422 (when (not (and (listp method) (eq (car method) :early-method)))
2423 (error "Early ADD-METHOD didn't get an early method."))
2424 (push method (early-gf-methods generic-function))
2425 (set-arg-info generic-function :new-method method)
2426 (unless (assoc (!early-gf-name generic-function)
2427 *!generic-function-fixups*
2429 (update-dfun generic-function)))
2431 ;;; This is the early version of REMOVE-METHOD. See comments on
2432 ;;; the early version of ADD-METHOD.
2433 (defun remove-method (generic-function method)
2434 (when (not (fsc-instance-p generic-function))
2435 (error "An early remove-method didn't get a funcallable instance."))
2436 (when (not (and (listp method) (eq (car method) :early-method)))
2437 (error "An early remove-method didn't get an early method."))
2438 (setf (early-gf-methods generic-function)
2439 (remove method (early-gf-methods generic-function)))
2440 (set-arg-info generic-function)
2441 (unless (assoc (!early-gf-name generic-function)
2442 *!generic-function-fixups*
2444 (update-dfun generic-function)))
2446 ;;; This is the early version of GET-METHOD. See comments on the early
2447 ;;; version of ADD-METHOD.
2448 (defun get-method (generic-function qualifiers specializers
2449 &optional (errorp t))
2450 (if (early-gf-p generic-function)
2451 (or (dolist (m (early-gf-methods generic-function))
2452 (when (and (or (equal (early-method-specializers m nil)
2454 (equal (early-method-specializers m t)
2456 (equal (early-method-qualifiers m) qualifiers))
2459 (error "can't get early method")
2461 (real-get-method generic-function qualifiers specializers errorp)))
2463 (defun !fix-early-generic-functions ()
2464 (let ((accessors nil))
2465 ;; Rearrange *!EARLY-GENERIC-FUNCTIONS* to speed up
2466 ;; FIX-EARLY-GENERIC-FUNCTIONS.
2467 (dolist (early-gf-spec *!early-generic-functions*)
2468 (when (every #'early-method-standard-accessor-p
2469 (early-gf-methods (gdefinition early-gf-spec)))
2470 (push early-gf-spec accessors)))
2471 (dolist (spec (nconc accessors
2472 '(accessor-method-slot-name
2473 generic-function-methods
2478 slot-definition-location
2479 slot-definition-name
2482 class-precedence-list
2483 slot-boundp-using-class
2484 (setf slot-value-using-class)
2485 slot-value-using-class
2488 funcallable-standard-class-p
2491 (setq *!early-generic-functions*
2493 (delete spec *!early-generic-functions* :test #'equal))))
2495 (dolist (early-gf-spec *!early-generic-functions*)
2496 (/show early-gf-spec)
2497 (let* ((gf (gdefinition early-gf-spec))
2498 (methods (mapcar (lambda (early-method)
2499 (let ((args (copy-list (fifth
2502 (early-method-specializers
2504 (apply #'real-make-a-method args)))
2505 (early-gf-methods gf))))
2506 (setf (generic-function-method-class gf) *the-class-standard-method*)
2507 (setf (generic-function-method-combination gf)
2508 *standard-method-combination*)
2509 (set-methods gf methods)))
2511 (dolist (fn *!early-functions*)
2513 (setf (gdefinition (car fn)) (fdefinition (caddr fn))))
2515 (dolist (fixup *!generic-function-fixups*)
2517 (let* ((fspec (car fixup))
2518 (gf (gdefinition fspec))
2519 (methods (mapcar (lambda (method)
2520 (let* ((lambda-list (first method))
2521 (specializers (mapcar #'find-class (second method)))
2522 (method-fn-name (third method))
2523 (fn-name (or method-fn-name fspec))
2524 (fn (fdefinition fn-name))
2528 (lambda (args next-methods)
2532 `(call ,fn-name)))))
2533 (declare (type function fn))
2534 (make-a-method 'standard-method
2541 (setf (generic-function-method-class gf) *the-class-standard-method*)
2542 (setf (generic-function-method-combination gf)
2543 *standard-method-combination*)
2544 (set-methods gf methods))))
2545 (/show "leaving !FIX-EARLY-GENERIC-FUNCTIONS"))
2547 ;;; PARSE-DEFMETHOD is used by DEFMETHOD to parse the &REST argument
2548 ;;; into the 'real' arguments. This is where the syntax of DEFMETHOD
2549 ;;; is really implemented.
2550 (defun parse-defmethod (cdr-of-form)
2551 (declare (list cdr-of-form))
2552 (let ((name (pop cdr-of-form))
2555 (loop (if (and (car cdr-of-form) (atom (car cdr-of-form)))
2556 (push (pop cdr-of-form) qualifiers)
2557 (return (setq qualifiers (nreverse qualifiers)))))
2558 (setq spec-ll (pop cdr-of-form))
2559 (values name qualifiers spec-ll cdr-of-form)))
2561 (defun parse-specializers (generic-function specializers)
2562 (declare (list specializers))
2563 (flet ((parse (spec)
2564 (parse-specializer-using-class generic-function spec)))
2565 (mapcar #'parse specializers)))
2567 (defun unparse-specializers (generic-function specializers)
2568 (declare (list specializers))
2569 (flet ((unparse (spec)
2570 (unparse-specializer-using-class generic-function spec)))
2571 (mapcar #'unparse specializers)))
2573 (defun extract-parameters (specialized-lambda-list)
2574 (multiple-value-bind (parameters ignore1 ignore2)
2575 (parse-specialized-lambda-list specialized-lambda-list)
2576 (declare (ignore ignore1 ignore2))
2579 (defun extract-lambda-list (specialized-lambda-list)
2580 (multiple-value-bind (ignore1 lambda-list ignore2)
2581 (parse-specialized-lambda-list specialized-lambda-list)
2582 (declare (ignore ignore1 ignore2))
2585 (defun extract-specializer-names (specialized-lambda-list)
2586 (multiple-value-bind (ignore1 ignore2 specializers)
2587 (parse-specialized-lambda-list specialized-lambda-list)
2588 (declare (ignore ignore1 ignore2))
2591 (defun extract-required-parameters (specialized-lambda-list)
2592 (multiple-value-bind (ignore1 ignore2 ignore3 required-parameters)
2593 (parse-specialized-lambda-list specialized-lambda-list)
2594 (declare (ignore ignore1 ignore2 ignore3))
2595 required-parameters))
2597 (define-condition specialized-lambda-list-error
2598 (reference-condition simple-program-error)
2600 (:default-initargs :references (list '(:ansi-cl :section (3 4 3)))))
2602 (defun parse-specialized-lambda-list
2604 &optional supplied-keywords (allowed-keywords '(&optional &rest &key &aux))
2605 &aux (specialized-lambda-list-keywords
2606 '(&optional &rest &key &allow-other-keys &aux)))
2607 (let ((arg (car arglist)))
2608 (cond ((null arglist) (values nil nil nil nil))
2610 (values nil arglist nil nil))
2611 ((memq arg lambda-list-keywords)
2612 ;; non-standard lambda-list-keywords are errors.
2613 (unless (memq arg specialized-lambda-list-keywords)
2614 (error 'specialized-lambda-list-error
2615 :format-control "unknown specialized-lambda-list ~
2617 :format-arguments (list arg)))
2618 ;; no multiple &rest x &rest bla specifying
2619 (when (memq arg supplied-keywords)
2620 (error 'specialized-lambda-list-error
2621 :format-control "multiple occurrence of ~
2622 specialized-lambda-list keyword ~S~%"
2623 :format-arguments (list arg)))
2624 ;; And no placing &key in front of &optional, either.
2625 (unless (memq arg allowed-keywords)
2626 (error 'specialized-lambda-list-error
2627 :format-control "misplaced specialized-lambda-list ~
2629 :format-arguments (list arg)))
2630 ;; When we are at a lambda-list keyword, the parameters
2631 ;; don't include the lambda-list keyword; the lambda-list
2632 ;; does include the lambda-list keyword; and no
2633 ;; specializers are allowed to follow the lambda-list
2634 ;; keywords (at least for now).
2635 (multiple-value-bind (parameters lambda-list)
2636 (parse-specialized-lambda-list (cdr arglist)
2637 (cons arg supplied-keywords)
2639 (cons '&allow-other-keys
2640 (cdr (member arg allowed-keywords)))
2641 (cdr (member arg allowed-keywords))))
2642 (when (and (eq arg '&rest)
2643 (or (null lambda-list)
2644 (memq (car lambda-list)
2645 specialized-lambda-list-keywords)
2646 (not (or (null (cadr lambda-list))
2647 (memq (cadr lambda-list)
2648 specialized-lambda-list-keywords)))))
2649 (error 'specialized-lambda-list-error
2651 "in a specialized-lambda-list, excactly one ~
2652 variable must follow &REST.~%"
2653 :format-arguments nil))
2655 (cons arg lambda-list)
2659 ;; After a lambda-list keyword there can be no specializers.
2660 (multiple-value-bind (parameters lambda-list)
2661 (parse-specialized-lambda-list (cdr arglist)
2664 (values (cons (if (listp arg) (car arg) arg) parameters)
2665 (cons arg lambda-list)
2669 (multiple-value-bind (parameters lambda-list specializers required)
2670 (parse-specialized-lambda-list (cdr arglist))
2671 (values (cons (if (listp arg) (car arg) arg) parameters)
2672 (cons (if (listp arg) (car arg) arg) lambda-list)
2673 (cons (if (listp arg) (cadr arg) t) specializers)
2674 (cons (if (listp arg) (car arg) arg) required)))))))
2676 (setq *boot-state* 'early)
2678 ;;; FIXME: In here there was a #-CMU definition of SYMBOL-MACROLET
2679 ;;; which used %WALKER stuff. That suggests to me that maybe the code
2680 ;;; walker stuff was only used for implementing stuff like that; maybe
2681 ;;; it's not needed any more? Hunt down what it was used for and see.
2683 (defun extract-the (form)
2684 (cond ((and (consp form) (eq (car form) 'the))
2685 (aver (proper-list-of-length-p 3))
2690 (defmacro with-slots (slots instance &body body)
2691 (let ((in (gensym)))
2692 `(let ((,in ,instance))
2693 (declare (ignorable ,in))
2694 ,@(let ((instance (extract-the instance)))
2695 (and (symbolp instance)
2696 `((declare (%variable-rebinding ,in ,instance)))))
2698 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2700 (if (symbolp slot-entry)
2704 (if (symbolp slot-entry)
2706 (cadr slot-entry))))
2708 (slot-value ,in ',slot-name))))
2712 (defmacro with-accessors (slots instance &body body)
2713 (let ((in (gensym)))
2714 `(let ((,in ,instance))
2715 (declare (ignorable ,in))
2716 ,@(let ((instance (extract-the instance)))
2717 (and (symbolp instance)
2718 `((declare (%variable-rebinding ,in ,instance)))))
2720 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2721 (let ((var-name (car slot-entry))
2722 (accessor-name (cadr slot-entry)))
2723 `(,var-name (,accessor-name ,in))))
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