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
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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)))
174 (dolist (spec (cdr option))
176 (error 'simple-program-error
177 :format-control "~@<Invalid declaration specifier in ~
179 :format-arguments (list spec)))
180 (when (member (first spec)
181 ;; FIXME: this list is slightly weird.
182 ;; ANSI (on the DEFGENERIC page) in one
183 ;; place allows only OPTIMIZE; in
184 ;; another place gives this list of
185 ;; disallowed declaration specifiers.
186 ;; This seems to be the only place where
187 ;; the FUNCTION declaration is
188 ;; mentioned; TYPE seems to be missing.
189 ;; Very strange. -- CSR, 2002-10-21
190 '(declaration ftype function
191 inline notinline special))
192 (error 'simple-program-error
193 :format-control "The declaration specifier ~S ~
194 is not allowed inside DEFGENERIC."
195 :format-arguments (list spec)))
196 (if (or (eq 'optimize (first spec))
197 (info :declaration :recognized (first spec)))
198 (push spec (initarg :declarations))
199 (warn "Ignoring unrecognized declaration in DEFGENERIC: ~S"
202 (when (initarg car-option)
203 (duplicate-option car-option))
204 (unless (symbolp (cadr option))
205 (error 'simple-program-error
206 :format-control "METHOD-COMBINATION name not a ~
208 :format-arguments (list (cadr option))))
209 (setf (initarg car-option)
211 (:argument-precedence-order
212 (let* ((required (parse-lambda-list lambda-list))
213 (supplied (cdr option)))
214 (unless (= (length required) (length supplied))
215 (error 'simple-program-error
216 :format-control "argument count discrepancy in ~
217 :ARGUMENT-PRECEDENCE-ORDER clause."
218 :format-arguments nil))
219 (when (set-difference required supplied)
220 (error 'simple-program-error
221 :format-control "unequal sets for ~
222 :ARGUMENT-PRECEDENCE-ORDER clause: ~
224 :format-arguments (list required supplied)))
225 (setf (initarg car-option)
227 ((:documentation :generic-function-class :method-class)
228 (unless (proper-list-of-length-p option 2)
229 (error "bad list length for ~S" option))
230 (if (initarg car-option)
231 (duplicate-option car-option)
232 (setf (initarg car-option) `',(cadr option))))
234 (push (cdr option) methods))
236 ;; ANSI requires that unsupported things must get a
238 (error 'simple-program-error
239 :format-control "unsupported option ~S"
240 :format-arguments (list option))))))
242 (when (initarg :declarations)
243 (setf (initarg :declarations)
244 `',(initarg :declarations))))
246 (eval-when (:compile-toplevel :load-toplevel :execute)
247 (compile-or-load-defgeneric ',fun-name))
248 (load-defgeneric ',fun-name ',lambda-list
249 (sb-c:source-location) ,@initargs)
250 ,@(mapcar #'expand-method-definition methods)
251 (fdefinition ',fun-name)))))
253 (defun compile-or-load-defgeneric (fun-name)
254 (proclaim-as-fun-name fun-name)
255 (note-name-defined fun-name :function)
256 (unless (eq (info :function :where-from fun-name) :declared)
257 (setf (info :function :where-from fun-name) :defined)
258 (setf (info :function :type fun-name)
259 (specifier-type 'function))))
261 (defun load-defgeneric (fun-name lambda-list source-location &rest initargs)
262 (when (fboundp fun-name)
263 (warn 'sb-kernel:redefinition-with-defgeneric
265 :new-location source-location)
266 (let ((fun (fdefinition fun-name)))
267 (when (generic-function-p fun)
268 (loop for method in (generic-function-initial-methods fun)
269 do (remove-method fun method))
270 (setf (generic-function-initial-methods fun) '()))))
271 (apply #'ensure-generic-function
273 :lambda-list lambda-list
274 :definition-source source-location
277 (define-condition generic-function-lambda-list-error
278 (reference-condition simple-program-error)
280 (:default-initargs :references (list '(:ansi-cl :section (3 4 2)))))
282 (defun check-gf-lambda-list (lambda-list)
283 (flet ((ensure (arg ok)
285 (error 'generic-function-lambda-list-error
287 "~@<invalid ~S ~_in the generic function lambda list ~S~:>"
288 :format-arguments (list arg lambda-list)))))
289 (multiple-value-bind (required optional restp rest keyp keys allowp
290 auxp aux morep more-context more-count)
291 (parse-lambda-list lambda-list)
292 (declare (ignore required)) ; since they're no different in a gf ll
293 (declare (ignore restp rest)) ; since they're no different in a gf ll
294 (declare (ignore allowp)) ; since &ALLOW-OTHER-KEYS is fine either way
295 (declare (ignore aux)) ; since we require AUXP=NIL
296 (declare (ignore more-context more-count)) ; safely ignored unless MOREP
297 ;; no defaults allowed for &OPTIONAL arguments
299 (ensure i (or (symbolp i)
300 (and (consp i) (symbolp (car i)) (null (cdr i))))))
301 ;; no defaults allowed for &KEY arguments
304 (ensure i (or (symbolp i)
306 (or (symbolp (car i))
314 (error "&AUX is not allowed in a generic function lambda list: ~S"
316 ;; Oh, *puhlease*... not specifically as per section 3.4.2 of
317 ;; the ANSI spec, but the CMU CL &MORE extension does not
319 (aver (not morep)))))
321 (defmacro defmethod (name &rest args)
322 (multiple-value-bind (qualifiers lambda-list body)
323 (parse-defmethod args)
325 (eval-when (:compile-toplevel :load-toplevel :execute)
326 (compile-or-load-defgeneric ',name))
327 ;; KLUDGE: this double expansion is quite a monumental
328 ;; workaround: it comes about because of a fantastic interaction
329 ;; between the processing rules of CLHS 3.2.3.1 and the
330 ;; bizarreness of MAKE-METHOD-LAMBDA.
332 ;; MAKE-METHOD-LAMBDA can be called by the user, and if the
333 ;; lambda itself doesn't refer to outside bindings the return
334 ;; value must be compileable in the null lexical environment.
335 ;; However, the function must also refer somehow to the
336 ;; associated method object, so that it can call NO-NEXT-METHOD
337 ;; with the appropriate arguments if there is no next method --
338 ;; but when the function is generated, the method object doesn't
341 ;; In order to resolve this issue, we insert a literal cons cell
342 ;; into the body of the method lambda, return the same cons cell
343 ;; as part of the second (initargs) return value of
344 ;; MAKE-METHOD-LAMBDA, and a method on INITIALIZE-INSTANCE fills
345 ;; in the cell when the method is created. However, this
346 ;; strategy depends on having a fresh cons cell for every method
347 ;; lambda, which (without the workaround below) is skewered by
348 ;; the processing in CLHS 3.2.3.1, which permits implementations
349 ;; to macroexpand the bodies of EVAL-WHEN forms with both
350 ;; :COMPILE-TOPLEVEL and :LOAD-TOPLEVEL only once. The
351 ;; expansion below forces the double expansion in those cases,
352 ;; while expanding only once in the common case.
353 (eval-when (:load-toplevel)
354 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body))
355 (eval-when (:execute)
356 (%defmethod-expander ,name ,qualifiers ,lambda-list ,body)))))
358 (defmacro %defmethod-expander
359 (name qualifiers lambda-list body &environment env)
360 (multiple-value-bind (proto-gf proto-method)
361 (prototypes-for-make-method-lambda name)
362 (expand-defmethod name proto-gf proto-method qualifiers
363 lambda-list body env)))
366 (defun prototypes-for-make-method-lambda (name)
367 (if (not (eq **boot-state** 'complete))
369 (let ((gf? (and (fboundp name)
370 (gdefinition name))))
372 (not (generic-function-p gf?)))
373 (values (class-prototype (find-class 'standard-generic-function))
374 (class-prototype (find-class 'standard-method)))
376 (class-prototype (or (generic-function-method-class gf?)
377 (find-class 'standard-method))))))))
379 ;;; Take a name which is either a generic function name or a list specifying
380 ;;; a SETF generic function (like: (SETF <generic-function-name>)). Return
381 ;;; the prototype instance of the method-class for that generic function.
383 ;;; If there is no generic function by that name, this returns the
384 ;;; default value, the prototype instance of the class
385 ;;; STANDARD-METHOD. This default value is also returned if the spec
386 ;;; names an ordinary function or even a macro. In effect, this leaves
387 ;;; the signalling of the appropriate error until load time.
389 ;;; Note: During bootstrapping, this function is allowed to return NIL.
390 (defun method-prototype-for-gf (name)
391 (let ((gf? (and (fboundp name)
392 (gdefinition name))))
393 (cond ((neq **boot-state** 'complete) nil)
395 (not (generic-function-p gf?))) ; Someone else MIGHT
396 ; error at load time.
397 (class-prototype (find-class 'standard-method)))
399 (class-prototype (or (generic-function-method-class gf?)
400 (find-class 'standard-method)))))))
402 ;;; These are used to communicate the method name and lambda-list to
403 ;;; MAKE-METHOD-LAMBDA-INTERNAL.
404 (defvar *method-name* nil)
405 (defvar *method-lambda-list* nil)
407 (defun expand-defmethod (name
414 (multiple-value-bind (parameters unspecialized-lambda-list specializers)
415 (parse-specialized-lambda-list lambda-list)
416 (declare (ignore parameters))
417 (let ((method-lambda `(lambda ,unspecialized-lambda-list ,@body))
418 (*method-name* `(,name ,@qualifiers ,specializers))
419 (*method-lambda-list* lambda-list))
420 (multiple-value-bind (method-function-lambda initargs)
421 (make-method-lambda proto-gf proto-method method-lambda env)
422 (let ((initargs-form (make-method-initargs-form
423 proto-gf proto-method method-function-lambda
425 (specializers-form (make-method-specializers-form
426 proto-gf proto-method specializers env)))
428 ;; Note: We could DECLAIM the ftype of the generic function
429 ;; here, since ANSI specifies that we create it if it does
430 ;; not exist. However, I chose not to, because I think it's
431 ;; more useful to support a style of programming where every
432 ;; generic function has an explicit DEFGENERIC and any typos
433 ;; in DEFMETHODs are warned about. Otherwise
435 ;; (DEFGENERIC FOO-BAR-BLETCH (X))
436 ;; (DEFMETHOD FOO-BAR-BLETCH ((X HASH-TABLE)) ..)
437 ;; (DEFMETHOD FOO-BRA-BLETCH ((X SIMPLE-VECTOR)) ..)
438 ;; (DEFMETHOD FOO-BAR-BLETCH ((X VECTOR)) ..)
439 ;; (DEFMETHOD FOO-BAR-BLETCH ((X ARRAY)) ..)
440 ;; (DEFMETHOD FOO-BAR-BLETCH ((X LIST)) ..)
442 ;; compiles without raising an error and runs without
443 ;; raising an error (since SIMPLE-VECTOR cases fall through
444 ;; to VECTOR) but still doesn't do what was intended. I hate
445 ;; that kind of bug (code which silently gives the wrong
446 ;; answer), so we don't do a DECLAIM here. -- WHN 20000229
447 ,(make-defmethod-form name qualifiers specializers-form
448 unspecialized-lambda-list
450 (class-name (class-of proto-method))
454 (defun interned-symbol-p (x)
455 (and (symbolp x) (symbol-package x)))
457 (defun make-defmethod-form
458 (name qualifiers specializers unspecialized-lambda-list
459 method-class-name initargs-form)
462 (if (and (interned-symbol-p (fun-name-block-name name))
463 (every #'interned-symbol-p qualifiers)
466 (and (eq (car s) 'eql)
468 (let ((sv (constant-form-value (cadr s))))
469 (or (interned-symbol-p sv)
472 (standard-char-p sv)))))
473 (interned-symbol-p s)))
475 (consp initargs-form)
476 (eq (car initargs-form) 'list*)
477 (memq (cadr initargs-form) '(:function))
478 (consp (setq fn (caddr initargs-form)))
479 (eq (car fn) 'function)
480 (consp (setq fn-lambda (cadr fn)))
481 (eq (car fn-lambda) 'lambda)
482 (bug "Really got here"))
483 (let* ((specls (mapcar (lambda (specl)
485 ;; CONSTANT-FORM-VALUE? What I
486 ;; kind of want to know, though,
487 ;; is what happens if we don't do
488 ;; this for some slow-method
489 ;; function because of a hairy
490 ;; lexenv -- is the only bad
491 ;; effect that the method
492 ;; function ends up unnamed? If
493 ;; so, couldn't we arrange to
495 `(,(car specl) ,(eval (cadr specl)))
498 (mname `(,(if (eq (cadr initargs-form) :function)
499 'slow-method 'fast-method)
500 ,name ,@qualifiers ,specls)))
502 (defun ,mname ,(cadr fn-lambda)
504 ,(make-defmethod-form-internal
505 name qualifiers `',specls
506 unspecialized-lambda-list method-class-name
507 `(list* ,(cadr initargs-form)
509 ,@(cdddr initargs-form)))))
510 (make-defmethod-form-internal
514 `(list ,@(mapcar (lambda (specializer)
515 (if (consp specializer)
516 ``(,',(car specializer)
517 ,,(cadr specializer))
520 unspecialized-lambda-list
524 (defun make-defmethod-form-internal
525 (name qualifiers specializers-form unspecialized-lambda-list
526 method-class-name initargs-form)
532 ',unspecialized-lambda-list
534 (sb-c:source-location)))
536 (defmacro make-method-function (method-lambda &environment env)
537 (multiple-value-bind (proto-gf proto-method)
538 (prototypes-for-make-method-lambda nil)
539 (multiple-value-bind (method-function-lambda initargs)
540 (make-method-lambda proto-gf proto-method method-lambda env)
541 (make-method-initargs-form proto-gf
543 method-function-lambda
547 (defun real-make-method-initargs-form (proto-gf proto-method
548 method-lambda initargs env)
549 (declare (ignore proto-gf proto-method))
550 (unless (and (consp method-lambda)
551 (eq (car method-lambda) 'lambda))
552 (error "The METHOD-LAMBDA argument to MAKE-METHOD-FUNCTION, ~S, ~
553 is not a lambda form."
555 (make-method-initargs-form-internal method-lambda initargs env))
557 (unless (fboundp 'make-method-initargs-form)
558 (setf (gdefinition 'make-method-initargs-form)
559 (symbol-function 'real-make-method-initargs-form)))
561 ;;; When bootstrapping PCL MAKE-METHOD-LAMBDA starts out as a regular
562 ;;; functions: REAL-MAKE-METHOD-LAMBDA set to the fdefinition of
563 ;;; MAKE-METHOD-LAMBDA. Once generic functions are born, the
564 ;;; REAL-MAKE-METHOD lambda is used as the body of the default method.
565 ;;; MAKE-METHOD-LAMBDA-INTERNAL is split out into a separate function
566 ;;; so that changing it in a live image is easy, and changes actually
568 (defun real-make-method-lambda (proto-gf proto-method method-lambda env)
569 (make-method-lambda-internal proto-gf proto-method method-lambda env))
571 (unless (fboundp 'make-method-lambda)
572 (setf (gdefinition 'make-method-lambda)
573 (symbol-function 'real-make-method-lambda)))
575 (defun declared-specials (declarations)
576 (loop for (declare . specifiers) in declarations
577 append (loop for specifier in specifiers
578 when (eq 'special (car specifier))
579 append (cdr specifier))))
581 (defun make-method-lambda-internal (proto-gf proto-method method-lambda env)
582 (declare (ignore proto-gf proto-method))
583 (unless (and (consp method-lambda) (eq (car method-lambda) 'lambda))
584 (error "The METHOD-LAMBDA argument to MAKE-METHOD-LAMBDA, ~S, ~
585 is not a lambda form."
587 (multiple-value-bind (real-body declarations documentation)
588 (parse-body (cddr method-lambda))
589 ;; We have the %METHOD-NAME declaration in the place where we expect it only
590 ;; if there is are no non-standard prior MAKE-METHOD-LAMBDA methods -- or
591 ;; unless they're fantastically unintrusive.
592 (let* ((method-name *method-name*)
593 (method-lambda-list *method-lambda-list*)
594 ;; Macroexpansion caused by code-walking may call make-method-lambda and
595 ;; end up with wrong values
597 (*method-lambda-list* nil)
598 (generic-function-name (when method-name (car method-name)))
599 (specialized-lambda-list (or method-lambda-list
600 (ecase (car method-lambda)
601 (lambda (second method-lambda))
602 (named-lambda (third method-lambda)))))
603 ;; the method-cell is a way of communicating what method a
604 ;; method-function implements, for the purpose of
605 ;; NO-NEXT-METHOD. We need something that can be shared
606 ;; between function and initargs, but not something that
607 ;; will be coalesced as a constant (because we are naughty,
608 ;; oh yes) with the expansion of any other methods in the
609 ;; same file. -- CSR, 2007-05-30
610 (method-cell (list (make-symbol "METHOD-CELL"))))
611 (multiple-value-bind (parameters lambda-list specializers)
612 (parse-specialized-lambda-list specialized-lambda-list)
613 (let* ((required-parameters
614 (mapcar (lambda (r s) (declare (ignore s)) r)
617 (slots (mapcar #'list required-parameters))
620 ;; These declarations seem to be used by PCL to pass
621 ;; information to itself; when I tried to delete 'em
622 ;; ca. 0.6.10 it didn't work. I'm not sure how
623 ;; they work, but note the (VAR-DECLARATION '%CLASS ..)
624 ;; expression in CAN-OPTIMIZE-ACCESS1. -- WHN 2000-12-30
626 (mapcar (lambda (a s) (and (symbolp s)
631 ;; These TYPE declarations weren't in the original
632 ;; PCL code, but the Python compiler likes them a
633 ;; lot. (We're telling the compiler about our
634 ;; knowledge of specialized argument types so that
635 ;; it can avoid run-time type dispatch overhead,
636 ;; which can be a huge win for Python.)
638 ;; KLUDGE: when I tried moving these to
639 ;; ADD-METHOD-DECLARATIONS, things broke. No idea
640 ;; why. -- CSR, 2004-06-16
641 ,@(let ((specials (declared-specials declarations)))
642 (mapcar (lambda (par spec)
643 (parameter-specializer-declaration-in-defmethod
644 par spec specials env))
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.
724 ,(when call-next-method-p t)
725 :next-method-p-p ,next-method-p-p
727 :parameters-setqd ,parameters-setqd
728 :method-cell ,method-cell
731 ,@walked-declarations
733 (declare (disable-package-locks
734 %parameter-binding-modified))
735 (symbol-macrolet ((%parameter-binding-modified
736 ',@parameters-setqd))
737 (declare (enable-package-locks
738 %parameter-binding-modified))
739 ,@walked-lambda-body))))
740 `(,@(when call-next-method-p `(method-cell ,method-cell))
741 ,@(when (member call-next-method-p '(:simple nil))
742 '(simple-next-method-call t))
743 ,@(when plist `(plist ,plist))
744 ,@(when documentation `(:documentation ,documentation)))))))))))
746 (defun real-make-method-specializers-form
747 (proto-gf proto-method specializer-names env)
748 (declare (ignore env proto-gf proto-method))
751 ((and (eq **boot-state** 'complete)
754 ((symbolp name) `(find-class ',name))
755 ((consp name) (ecase (car name)
756 ((eql) `(intern-eql-specializer ,(cadr name)))
757 ((class-eq) `(class-eq-specializer (find-class ',(cadr name))))))
759 ;; FIXME: Document CLASS-EQ specializers.
760 (error 'simple-reference-error
762 "~@<~S is not a valid parameter specializer name.~@:>"
763 :format-arguments (list name)
764 :references (list '(:ansi-cl :macro defmethod)
765 '(:ansi-cl :glossary "parameter specializer name")))))))
766 `(list ,@(mapcar #'parse specializer-names))))
768 (unless (fboundp 'make-method-specializers-form)
769 (setf (gdefinition 'make-method-specializers-form)
770 (symbol-function 'real-make-method-specializers-form)))
772 (defun real-parse-specializer-using-class (generic-function specializer)
773 (let ((result (specializer-from-type specializer)))
774 (if (specializerp result)
776 (error "~@<~S cannot be parsed as a specializer for ~S.~@:>"
777 specializer generic-function))))
779 (unless (fboundp 'parse-specializer-using-class)
780 (setf (gdefinition 'parse-specializer-using-class)
781 (symbol-function 'real-parse-specializer-using-class)))
783 (defun real-unparse-specializer-using-class (generic-function specializer)
784 (if (specializerp specializer)
785 ;; FIXME: this HANDLER-CASE is a bit of a hammer to crack a nut:
786 ;; the idea is that we want to unparse permissively, so that the
787 ;; lazy (or rather the "portable") specializer extender (who
788 ;; does not define methods on these new SBCL-specific MOP
789 ;; functions) can still subclass specializer and define methods
790 ;; without everything going wrong. Making it cleaner and
791 ;; clearer that that is what we are defending against would be
792 ;; nice. -- CSR, 2007-06-01
794 (let ((type (specializer-type specializer)))
795 (if (and (consp type) (eq (car type) 'class))
796 (let* ((class (cadr type))
797 (class-name (class-name class)))
798 (if (eq class (find-class class-name nil))
802 (error () specializer))
803 (error "~@<~S is not a legal specializer for ~S.~@:>"
804 specializer generic-function)))
806 (unless (fboundp 'unparse-specializer-using-class)
807 (setf (gdefinition 'unparse-specializer-using-class)
808 (symbol-function 'real-unparse-specializer-using-class)))
810 ;;; a helper function for creating Python-friendly type declarations
811 ;;; in DEFMETHOD forms.
813 ;;; We're too lazy to cons up a new environment for this, so we just pass in
814 ;;; the list of locally declared specials in addition to the old environment.
815 (defun parameter-specializer-declaration-in-defmethod
816 (parameter specializer specials env)
817 (cond ((and (consp specializer)
818 (eq (car specializer) 'eql))
819 ;; KLUDGE: ANSI, in its wisdom, says that
820 ;; EQL-SPECIALIZER-FORMs in EQL specializers are evaluated at
821 ;; DEFMETHOD expansion time. Thus, although one might think
823 ;; (DEFMETHOD FOO ((X PACKAGE)
826 ;; the PACKAGE and (EQL 12) forms are both parallel type
827 ;; names, they're not, as is made clear when you do
828 ;; (DEFMETHOD FOO ((X PACKAGE)
831 ;; where Y needs to be a symbol named "BAR", not some cons
832 ;; made by (CONS 'QUOTE 'BAR). I.e. when the
833 ;; EQL-SPECIALIZER-FORM is (EQL 'X), it requires an argument
834 ;; to be of type (EQL X). It'd be easy to transform one to
835 ;; the other, but it'd be somewhat messier to do so while
836 ;; ensuring that the EQL-SPECIALIZER-FORM is only EVAL'd
837 ;; once. (The new code wouldn't be messy, but it'd require a
838 ;; big transformation of the old code.) So instead we punt.
842 ;; KLUDGE: For some low-level implementation
843 ;; classes, perhaps because of some problems related
844 ;; to the incomplete integration of PCL into SBCL's
845 ;; type system, some specializer classes can't be
846 ;; declared as argument types. E.g.
847 ;; (DEFMETHOD FOO ((X SLOT-OBJECT))
848 ;; (DECLARE (TYPE SLOT-OBJECT X))
851 ;; (DEFSTRUCT BAR A B)
853 ;; perhaps because of the way that STRUCTURE-OBJECT
854 ;; inherits both from SLOT-OBJECT and from
855 ;; SB-KERNEL:INSTANCE. In an effort to sweep such
856 ;; problems under the rug, we exclude these problem
857 ;; cases by blacklisting them here. -- WHN 2001-01-19
858 (list 'slot-object #+nil (find-class 'slot-object)))
860 ((not (eq **boot-state** 'complete))
861 ;; KLUDGE: PCL, in its wisdom, sometimes calls methods with
862 ;; types which don't match their specializers. (Specifically,
863 ;; it calls ENSURE-CLASS-USING-CLASS (T NULL) with a non-NULL
864 ;; second argument.) Hopefully it only does this kind of
865 ;; weirdness when bootstrapping.. -- WHN 20000610
867 ((typep specializer 'eql-specializer)
868 `(type (eql ,(eql-specializer-object specializer)) ,parameter))
869 ((or (var-special-p parameter env) (member parameter specials))
870 ;; Don't declare types for special variables -- our rebinding magic
871 ;; for SETQ cases don't work right there as SET, (SETF SYMBOL-VALUE),
872 ;; etc. make things undecidable.
875 ;; Otherwise, we can usually make Python very happy.
877 ;; KLUDGE: Since INFO doesn't work right for class objects here,
878 ;; and they are valid specializers, see if the specializer is
879 ;; a named class, and use the name in that case -- otherwise
880 ;; the class instance is ok, since info will just return NIL, NIL.
882 ;; We still need to deal with the class case too, but at
883 ;; least #.(find-class 'integer) and integer as equivalent
884 ;; specializers with this.
885 (let* ((specializer-nameoid
886 (if (and (typep specializer 'class)
887 (let ((name (class-name specializer)))
888 (and name (symbolp name)
889 (eq specializer (find-class name nil)))))
890 (class-name specializer)
892 (kind (info :type :kind specializer-nameoid)))
894 (flet ((specializer-nameoid-class ()
895 (typecase specializer-nameoid
896 (symbol (find-class specializer-nameoid nil))
897 (class specializer-nameoid)
898 (class-eq-specializer
899 (specializer-class specializer-nameoid))
902 ((:primitive) `(type ,specializer-nameoid ,parameter))
904 (let ((class (specializer-nameoid-class)))
905 ;; CLASS can be null here if the user has
906 ;; erroneously tried to use a defined type as a
907 ;; specializer; it can be a non-BUILT-IN-CLASS if
908 ;; the user defines a type and calls (SETF
909 ;; FIND-CLASS) in a consistent way.
910 (when (and class (typep class 'built-in-class))
911 `(type ,(class-name class) ,parameter))))
913 (let ((class (specializer-nameoid-class)))
916 (if (typep class '(or built-in-class structure-class))
917 `(type ,class ,parameter)
918 ;; don't declare CLOS classes as parameters;
919 ;; it's too expensive.
922 ;; we can get here, and still not have a failure
923 ;; case, by doing MOP programming like (PROGN
924 ;; (ENSURE-CLASS 'FOO) (DEFMETHOD BAR ((X FOO))
925 ;; ...)). Best to let the user know we haven't
926 ;; been able to extract enough information:
928 "~@<can't find type for specializer ~S in ~S.~@:>"
930 'parameter-specializer-declaration-in-defmethod)
932 ((:forthcoming-defclass-type)
935 ;;; For passing a list (groveled by the walker) of the required
936 ;;; parameters whose bindings are modified in the method body to the
937 ;;; optimized-slot-value* macros.
938 (define-symbol-macro %parameter-binding-modified ())
940 (defmacro simple-lexical-method-functions ((lambda-list
946 ,method-args ,next-methods
947 (bind-simple-lexical-method-functions (,method-args ,next-methods
949 (bind-args (,lambda-list ,method-args)
952 (defmacro fast-lexical-method-functions ((lambda-list
958 `(bind-fast-lexical-method-functions (,args ,rest-arg ,next-method-call ,lmf-options)
959 (bind-args (,(nthcdr (length args) lambda-list) ,rest-arg)
962 (defmacro bind-simple-lexical-method-functions
963 ((method-args next-methods (&key call-next-method-p next-method-p-p setq-p
964 parameters-setqd closurep applyp method-cell))
967 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
970 `(let ((.next-method. (car ,next-methods))
971 (,next-methods (cdr ,next-methods)))
972 (declare (ignorable .next-method. ,next-methods))
973 (flet (,@(and call-next-method-p
974 `((call-next-method (&rest cnm-args)
975 (declare (dynamic-extent cnm-args))
976 ,@(if (safe-code-p env)
977 `((%check-cnm-args cnm-args
982 (funcall (if (std-instance-p .next-method.)
983 (method-function .next-method.)
984 .next-method.) ; for early methods
985 (or cnm-args ,method-args)
987 (apply #'call-no-next-method
989 (or cnm-args ,method-args))))))
990 ,@(and next-method-p-p
992 (not (null .next-method.))))))
995 (defun call-no-next-method (method-cell &rest args)
996 (let ((method (car method-cell)))
998 ;; Can't easily provide a RETRY restart here, as the return value here is
999 ;; for the method, not the generic function.
1000 (apply #'no-next-method (method-generic-function method)
1003 (defun call-no-applicable-method (gf args)
1005 (apply #'no-applicable-method gf args)
1007 :report "Retry calling the generic function."
1010 (defun call-no-primary-method (gf args)
1012 (apply #'no-primary-method gf args)
1014 :report "Retry calling the generic function."
1017 (defstruct (method-call (:copier nil))
1018 (function #'identity :type function)
1020 (defstruct (constant-method-call (:copier nil) (:include method-call))
1023 #-sb-fluid (declaim (sb-ext:freeze-type method-call))
1025 (defmacro invoke-method-call1 (function args cm-args)
1026 `(let ((.function. ,function)
1028 (.cm-args. ,cm-args))
1029 (if (and .cm-args. (null (cdr .cm-args.)))
1030 (funcall .function. .args. (car .cm-args.))
1031 (apply .function. .args. .cm-args.))))
1033 (defmacro invoke-method-call (method-call restp &rest required-args+rest-arg)
1034 `(invoke-method-call1 (method-call-function ,method-call)
1036 `(list* ,@required-args+rest-arg)
1037 `(list ,@required-args+rest-arg))
1038 (method-call-call-method-args ,method-call)))
1040 (defstruct (fast-method-call (:copier nil))
1041 (function #'identity :type function)
1045 (defstruct (constant-fast-method-call
1046 (:copier nil) (:include fast-method-call))
1049 #-sb-fluid (declaim (sb-ext:freeze-type fast-method-call))
1051 ;; The two variants of INVOKE-FAST-METHOD-CALL differ in how REST-ARGs
1052 ;; are handled. The first one will get REST-ARG as a single list (as
1053 ;; the last argument), and will thus need to use APPLY. The second one
1054 ;; will get them as a &MORE argument, so we can pass the arguments
1055 ;; directly with MULTIPLE-VALUE-CALL and %MORE-ARG-VALUES.
1057 (defmacro invoke-fast-method-call (method-call restp &rest required-args+rest-arg)
1058 `(,(if restp 'apply 'funcall) (fast-method-call-function ,method-call)
1059 (fast-method-call-pv ,method-call)
1060 (fast-method-call-next-method-call ,method-call)
1061 ,@required-args+rest-arg))
1063 (defmacro invoke-fast-method-call/more (method-call
1066 &rest required-args)
1067 (macrolet ((generate-call (n)
1068 ``(funcall (fast-method-call-function ,method-call)
1069 (fast-method-call-pv ,method-call)
1070 (fast-method-call-next-method-call ,method-call)
1072 ,@(loop for x below ,n
1073 collect `(sb-c::%more-arg ,more-context ,x)))))
1074 ;; The cases with only small amounts of required arguments passed
1075 ;; are probably very common, and special-casing speeds them up by
1076 ;; a factor of 2 with very little effect on the other
1077 ;; cases. Though it'd be nice to have the generic case be equally
1080 (0 ,(generate-call 0))
1081 (1 ,(generate-call 1))
1082 (t (multiple-value-call (fast-method-call-function ,method-call)
1083 (values (fast-method-call-pv ,method-call))
1084 (values (fast-method-call-next-method-call ,method-call))
1086 (sb-c::%more-arg-values ,more-context 0 ,more-count))))))
1088 (defstruct (fast-instance-boundp (:copier nil))
1089 (index 0 :type fixnum))
1091 #-sb-fluid (declaim (sb-ext:freeze-type fast-instance-boundp))
1093 (eval-when (:compile-toplevel :load-toplevel :execute)
1094 (defvar *allow-emf-call-tracing-p* nil)
1095 (defvar *enable-emf-call-tracing-p* #-sb-show nil #+sb-show t))
1097 ;;;; effective method functions
1099 (defvar *emf-call-trace-size* 200)
1100 (defvar *emf-call-trace* nil)
1101 (defvar *emf-call-trace-index* 0)
1103 ;;; This function was in the CMU CL version of PCL (ca Debian 2.4.8)
1104 ;;; without explanation. It appears to be intended for debugging, so
1105 ;;; it might be useful someday, so I haven't deleted it.
1106 ;;; But it isn't documented and isn't used for anything now, so
1107 ;;; I've conditionalized it out of the base system. -- WHN 19991213
1109 (defun show-emf-call-trace ()
1110 (when *emf-call-trace*
1111 (let ((j *emf-call-trace-index*)
1112 (*enable-emf-call-tracing-p* nil))
1113 (format t "~&(The oldest entries are printed first)~%")
1114 (dotimes-fixnum (i *emf-call-trace-size*)
1115 (let ((ct (aref *emf-call-trace* j)))
1116 (when ct (print ct)))
1118 (when (= j *emf-call-trace-size*)
1121 (defun trace-emf-call-internal (emf format args)
1122 (unless *emf-call-trace*
1123 (setq *emf-call-trace* (make-array *emf-call-trace-size*)))
1124 (setf (aref *emf-call-trace* *emf-call-trace-index*)
1125 (list* emf format args))
1126 (incf *emf-call-trace-index*)
1127 (when (= *emf-call-trace-index* *emf-call-trace-size*)
1128 (setq *emf-call-trace-index* 0)))
1130 (defmacro trace-emf-call (emf format args)
1131 (when *allow-emf-call-tracing-p*
1132 `(when *enable-emf-call-tracing-p*
1133 (trace-emf-call-internal ,emf ,format ,args))))
1135 (defmacro invoke-effective-method-function-fast
1136 (emf restp &key required-args rest-arg more-arg)
1138 (trace-emf-call ,emf ,restp (list ,@required-args rest-arg))
1140 `(invoke-fast-method-call/more ,emf
1143 `(invoke-fast-method-call ,emf
1148 (defun effective-method-optimized-slot-access-clause
1149 (emf restp required-args)
1150 ;; "What," you may wonder, "do these next two clauses do?" In that
1151 ;; case, you are not a PCL implementor, for they considered this to
1152 ;; be self-documenting.:-| Or CSR, for that matter, since he can
1153 ;; also figure it out by looking at it without breaking stride. For
1154 ;; the rest of us, though: From what the code is doing with .SLOTS.
1155 ;; and whatnot, evidently it's implementing SLOT-VALUEish and
1156 ;; GET-SLOT-VALUEish things. Then we can reason backwards and
1157 ;; conclude that setting EMF to a FIXNUM is an optimized way to
1158 ;; represent these slot access operations.
1160 (let ((length (length required-args)))
1163 (let* ((.slots. (get-slots-or-nil
1164 ,(car required-args)))
1165 (value (when .slots. (clos-slots-ref .slots. ,emf))))
1166 (if (eq value +slot-unbound+)
1167 (slot-unbound-internal ,(car required-args)
1172 (let ((.new-value. ,(car required-args))
1173 (.slots. (get-slots-or-nil
1174 ,(cadr required-args))))
1176 (setf (clos-slots-ref .slots. ,emf) .new-value.)))))))
1177 ;; (In cmucl-2.4.8 there was a commented-out third ,@(WHEN
1178 ;; ...) clause here to handle SLOT-BOUNDish stuff. Since
1179 ;; there was no explanation and presumably the code is 10+
1180 ;; years stale, I simply deleted it. -- WHN)
1183 ;;; Before SBCL 0.9.16.7 instead of
1184 ;;; INVOKE-NARROW-EFFECTIVE-METHOD-FUNCTION we passed a (THE (OR
1185 ;;; FUNCTION METHOD-CALL FAST-METHOD-CALL) EMF) form as the EMF. Now,
1186 ;;; to make less work for the compiler we take a path that doesn't
1187 ;;; involve the slot-accessor clause (where EMF is a FIXNUM) at all.
1188 (macrolet ((def (name &optional narrow)
1189 `(defmacro ,name (emf restp &key required-args rest-arg more-arg)
1190 (unless (constantp restp)
1191 (error "The RESTP argument is not constant."))
1192 (setq restp (constant-form-value restp))
1193 (with-unique-names (emf-n)
1195 (declare (optimize (sb-c:insert-step-conditions 0)))
1196 (let ((,emf-n ,emf))
1197 (trace-emf-call ,emf-n ,restp (list ,@required-args ,@rest-arg))
1201 `(invoke-fast-method-call/more ,emf-n
1204 `(invoke-fast-method-call ,emf-n
1209 `(effective-method-optimized-slot-access-clause
1210 emf-n restp required-args))
1212 (invoke-method-call ,emf-n ,restp ,@required-args
1216 `(apply ,emf-n ,@required-args ,@rest-arg)
1217 `(funcall ,emf-n ,@required-args
1218 ,@rest-arg))))))))))
1219 (def invoke-effective-method-function nil)
1220 (def invoke-narrow-effective-method-function t))
1222 (defun invoke-emf (emf args)
1223 (trace-emf-call emf t args)
1226 (let* ((arg-info (fast-method-call-arg-info emf))
1227 (restp (cdr arg-info))
1228 (nreq (car arg-info)))
1230 (apply (fast-method-call-function emf)
1231 (fast-method-call-pv emf)
1232 (fast-method-call-next-method-call emf)
1236 (invoke-fast-method-call emf nil)
1237 (error 'simple-program-error
1238 :format-control "invalid number of arguments: 0"
1239 :format-arguments nil)))
1242 (invoke-fast-method-call emf nil (car args))
1243 (error 'simple-program-error
1244 :format-control "invalid number of arguments: 1"
1245 :format-arguments nil)))
1248 (invoke-fast-method-call emf nil (car args) (cadr args))
1249 (error 'simple-program-error
1250 :format-control "invalid number of arguments: 2"
1251 :format-arguments nil)))
1253 (apply (fast-method-call-function emf)
1254 (fast-method-call-pv emf)
1255 (fast-method-call-next-method-call emf)
1258 (apply (method-call-function emf)
1260 (method-call-call-method-args emf)))
1263 (error 'simple-program-error
1264 :format-control "invalid number of arguments: 0"
1265 :format-arguments nil))
1267 (let* ((slots (get-slots (car args)))
1268 (value (clos-slots-ref slots emf)))
1269 (if (eq value +slot-unbound+)
1270 (slot-unbound-internal (car args) emf)
1273 (setf (clos-slots-ref (get-slots (cadr args)) emf)
1275 (t (error 'simple-program-error
1276 :format-control "invalid number of arguments"
1277 :format-arguments nil))))
1278 (fast-instance-boundp
1279 (if (or (null args) (cdr args))
1280 (error 'simple-program-error
1281 :format-control "invalid number of arguments"
1282 :format-arguments nil)
1283 (let ((slots (get-slots (car args))))
1284 (not (eq (clos-slots-ref slots (fast-instance-boundp-index emf))
1290 (defmacro fast-call-next-method-body ((args next-method-call rest-arg)
1293 `(if ,next-method-call
1294 ,(let ((call `(invoke-narrow-effective-method-function
1296 ,(not (null rest-arg))
1297 :required-args ,args
1298 :rest-arg ,(when rest-arg (list rest-arg)))))
1302 `(&rest ,rest-arg)))
1306 (call-no-next-method ',method-cell
1311 (defmacro bind-fast-lexical-method-functions
1312 ((args rest-arg next-method-call (&key
1322 (let* ((rebindings (when (or setq-p call-next-method-p)
1323 (mapcar (lambda (x) (list x x)) parameters-setqd))))
1324 (if (not (or call-next-method-p setq-p closurep next-method-p-p applyp))
1327 `(flet (,@(when call-next-method-p
1328 `((call-next-method (&rest cnm-args)
1329 (declare (dynamic-extent cnm-args)
1330 (muffle-conditions code-deletion-note)
1331 (optimize (sb-c:insert-step-conditions 0)))
1332 ,@(if (safe-code-p env)
1333 `((%check-cnm-args cnm-args (list ,@args)
1336 (fast-call-next-method-body (,args
1341 ,@(when next-method-p-p
1343 (declare (optimize (sb-c:insert-step-conditions 0)))
1344 (not (null ,next-method-call))))))
1348 ;;; CMUCL comment (Gerd Moellmann):
1350 ;;; The standard says it's an error if CALL-NEXT-METHOD is called with
1351 ;;; arguments, and the set of methods applicable to those arguments is
1352 ;;; different from the set of methods applicable to the original
1353 ;;; method arguments. (According to Barry Margolin, this rule was
1354 ;;; probably added to ensure that before and around methods are always
1355 ;;; run before primary methods.)
1357 ;;; This could be optimized for the case that the generic function
1358 ;;; doesn't have hairy methods, does have standard method combination,
1359 ;;; is a standard generic function, there are no methods defined on it
1360 ;;; for COMPUTE-APPLICABLE-METHODS and probably a lot more of such
1361 ;;; preconditions. That looks hairy and is probably not worth it,
1362 ;;; because this check will never be fast.
1363 (defun %check-cnm-args (cnm-args orig-args method-cell)
1364 ;; 1. Check for no arguments.
1366 (let* ((gf (method-generic-function (car method-cell)))
1367 (nreq (generic-function-nreq gf)))
1368 (declare (fixnum nreq))
1369 ;; 2. Requirement arguments pairwise: if all are EQL, the applicable
1370 ;; methods must be the same. This takes care of the relatively common
1371 ;; case of twiddling with &KEY arguments without being horribly
1373 (unless (do ((orig orig-args (cdr orig))
1374 (args cnm-args (cdr args))
1377 (unless (and orig args (eql (car orig) (car args)))
1379 ;; 3. Only then do the full check.
1380 (let ((omethods (compute-applicable-methods gf orig-args))
1381 (nmethods (compute-applicable-methods gf cnm-args)))
1382 (unless (equal omethods nmethods)
1383 (error "~@<The set of methods ~S applicable to argument~P ~
1384 ~{~S~^, ~} to call-next-method is different from ~
1385 the set of methods ~S applicable to the original ~
1386 method argument~P ~{~S~^, ~}.~@:>"
1387 nmethods (length cnm-args) cnm-args omethods
1388 (length orig-args) orig-args)))))))
1390 (defmacro bind-args ((lambda-list args) &body body)
1391 (let ((args-tail '.args-tail.)
1394 (flet ((process-var (var)
1395 (if (memq var lambda-list-keywords)
1398 (&optional (setq state 'optional))
1399 (&key (setq state 'key))
1401 (&rest (setq state 'rest))
1402 (&aux (setq state 'aux))
1405 "encountered the non-standard lambda list keyword ~S"
1409 (required `((,var (pop ,args-tail))))
1410 (optional (cond ((not (consp var))
1411 `((,var (when ,args-tail
1412 (pop ,args-tail)))))
1414 `((,(car var) (if ,args-tail
1418 `((,(caddr var) (not (null ,args-tail)))
1419 (,(car var) (if ,args-tail
1422 (rest `((,var ,args-tail)))
1423 (key (cond ((not (consp var))
1425 (get-key-arg-tail ,(keywordicate var)
1428 (multiple-value-bind (keyword variable)
1429 (if (consp (car var))
1432 (values (keywordicate (car var))
1434 `((,key (get-key-arg-tail ',keyword
1440 (multiple-value-bind (keyword variable)
1441 (if (consp (car var))
1444 (values (keywordicate (car var))
1446 `((,key (get-key-arg-tail ',keyword
1448 (,(caddr var) (not (null,key)))
1453 (let ((bindings (mapcan #'process-var lambda-list)))
1454 `(let* ((,args-tail ,args)
1457 ,@(when (eq state 'optional)
1458 `((unless (null ,args-tail)
1459 (error 'simple-program-error
1460 :format-control "surplus arguments: ~S"
1461 :format-arguments (list ,args-tail)))))))
1462 (declare (ignorable ,args-tail .dummy0.))
1465 (defun get-key-arg-tail (keyword list)
1466 (loop for (key . tail) on list by #'cddr
1468 ;; FIXME: Do we want to export this symbol? Or maybe use an
1469 ;; (ERROR 'SIMPLE-PROGRAM-ERROR) form?
1470 (sb-c::%odd-key-args-error)
1471 when (eq key keyword)
1474 (defun walk-method-lambda (method-lambda required-parameters env slots)
1475 (let (;; flag indicating that CALL-NEXT-METHOD should be in the
1476 ;; method definition
1477 (call-next-method-p nil)
1478 ;; flag indicating that #'CALL-NEXT-METHOD was seen in the
1481 ;; flag indicating that NEXT-METHOD-P should be in the method
1483 (next-method-p-p nil)
1484 ;; a list of all required parameters whose bindings might be
1485 ;; modified in the method body.
1486 (parameters-setqd nil))
1487 (flet ((walk-function (form context env)
1488 (cond ((not (eq context :eval)) form)
1489 ;; FIXME: Jumping to a conclusion from the way it's used
1490 ;; above, perhaps CONTEXT should be called SITUATION
1491 ;; (after the term used in the ANSI specification of
1492 ;; EVAL-WHEN) and given modern ANSI keyword values
1493 ;; like :LOAD-TOPLEVEL.
1494 ((not (listp form)) form)
1495 ((eq (car form) 'call-next-method)
1496 (setq call-next-method-p (if (cdr form)
1500 ((eq (car form) 'next-method-p)
1501 (setq next-method-p-p t)
1503 ((memq (car form) '(setq multiple-value-setq))
1504 ;; The walker will split (SETQ A 1 B 2) to
1505 ;; separate (SETQ A 1) and (SETQ B 2) forms, so we
1506 ;; only need to handle the simple case of SETQ
1508 (let ((vars (if (eq (car form) 'setq)
1509 (list (second form))
1512 ;; Note that we don't need to check for
1513 ;; %VARIABLE-REBINDING declarations like is
1514 ;; done in CAN-OPTIMIZE-ACCESS1, since the
1515 ;; bindings that will have that declation will
1517 (when (var-declaration '%class var env)
1518 ;; If a parameter binding is shadowed by
1519 ;; another binding it won't have a %CLASS
1520 ;; declaration anymore, and this won't get
1522 (pushnew var parameters-setqd :test #'eq))))
1524 ((and (eq (car form) 'function)
1525 (cond ((eq (cadr form) 'call-next-method)
1526 (setq call-next-method-p t)
1529 ((eq (cadr form) 'next-method-p)
1530 (setq next-method-p-p t)
1534 ((and (memq (car form)
1535 '(slot-value set-slot-value slot-boundp))
1536 (constantp (caddr form) env))
1537 (let ((fun (ecase (car form)
1538 (slot-value #'optimize-slot-value)
1539 (set-slot-value #'optimize-set-slot-value)
1540 (slot-boundp #'optimize-slot-boundp))))
1541 (funcall fun form slots required-parameters env)))
1544 (let ((walked-lambda (walk-form method-lambda env #'walk-function)))
1545 ;;; FIXME: the walker's rewriting of the source code causes
1546 ;;; trouble when doing code coverage. The rewrites should be
1547 ;;; removed, and the same operations done using
1548 ;;; compiler-macros or tranforms.
1549 (values (if (sb-c:policy env (= sb-c:store-coverage-data 0))
1555 (not (null parameters-setqd))
1556 parameters-setqd)))))
1558 (defun generic-function-name-p (name)
1559 (and (legal-fun-name-p name)
1561 (if (eq **boot-state** 'complete)
1562 (standard-generic-function-p (gdefinition name))
1563 (funcallable-instance-p (gdefinition name)))))
1565 (defun method-plist-value (method key &optional default)
1566 (let ((plist (if (consp method)
1567 (getf (early-method-initargs method) 'plist)
1568 (object-plist method))))
1569 (getf plist key default)))
1571 (defun (setf method-plist-value) (new-value method key &optional default)
1573 (setf (getf (getf (early-method-initargs method) 'plist) key default)
1575 (setf (getf (object-plist method) key default) new-value)))
1577 (defun load-defmethod (class name quals specls ll initargs source-location)
1578 (let ((method-cell (getf initargs 'method-cell)))
1579 (setq initargs (copy-tree initargs))
1581 (setf (getf initargs 'method-cell) method-cell))
1583 (setf (getf (getf initargs 'plist) :name)
1584 (make-method-spec name quals specls))
1585 (load-defmethod-internal class name quals specls
1586 ll initargs source-location)))
1588 (defun load-defmethod-internal
1589 (method-class gf-spec qualifiers specializers lambda-list
1590 initargs source-location)
1591 (when (and (eq **boot-state** 'complete)
1593 (let* ((gf (fdefinition gf-spec))
1594 (method (and (generic-function-p gf)
1595 (generic-function-methods gf)
1596 (find-method gf qualifiers specializers nil))))
1598 (warn 'sb-kernel:redefinition-with-defmethod
1600 :new-location source-location
1602 :qualifiers qualifiers :specializers specializers))))
1603 (let ((method (apply #'add-named-method
1604 gf-spec qualifiers specializers lambda-list
1605 :definition-source source-location
1607 (unless (or (eq method-class 'standard-method)
1608 (eq (find-class method-class nil) (class-of method)))
1609 ;; FIXME: should be STYLE-WARNING?
1610 (format *error-output*
1611 "~&At the time the method with qualifiers ~:S and~%~
1612 specializers ~:S on the generic function ~S~%~
1613 was compiled, the method-class for that generic function was~%~
1614 ~S. But, the method class is now ~S, this~%~
1615 may mean that this method was compiled improperly.~%"
1616 qualifiers specializers gf-spec
1617 method-class (class-name (class-of method))))
1620 (defun make-method-spec (gf qualifiers specializers)
1621 (let ((name (generic-function-name gf))
1622 (unparsed-specializers (unparse-specializers gf specializers)))
1623 `(slow-method ,name ,@qualifiers ,unparsed-specializers)))
1625 (defun initialize-method-function (initargs method)
1626 (let* ((mf (getf initargs :function))
1627 (mff (and (typep mf '%method-function)
1628 (%method-function-fast-function mf)))
1629 (plist (getf initargs 'plist))
1630 (name (getf plist :name))
1631 (method-cell (getf initargs 'method-cell)))
1633 (setf (car method-cell) method))
1636 (setq mf (set-fun-name mf name)))
1637 (when (and mff (consp name) (eq (car name) 'slow-method))
1638 (let ((fast-name `(fast-method ,@(cdr name))))
1639 (set-fun-name mff fast-name))))
1641 (let ((plist plist))
1642 (let ((snl (getf plist :slot-name-lists)))
1644 (setf (method-plist-value method :pv-table)
1645 (intern-pv-table :slot-name-lists snl))))))))
1647 (defun analyze-lambda-list (lambda-list)
1648 (flet (;; FIXME: Is this redundant with SB-C::MAKE-KEYWORD-FOR-ARG?
1649 (parse-key-arg (arg)
1651 (if (listp (car arg))
1653 (keywordicate (car arg)))
1654 (keywordicate arg))))
1660 (allow-other-keys-p nil)
1662 (keyword-parameters ())
1664 (dolist (x lambda-list)
1665 (if (memq x lambda-list-keywords)
1667 (&optional (setq state 'optional))
1670 (&allow-other-keys (setq allow-other-keys-p t))
1671 (&rest (setq restp t
1675 (error "encountered the non-standard lambda list keyword ~S"
1678 (required (incf nrequired))
1679 (optional (incf noptional))
1680 (key (push (parse-key-arg x) keywords)
1681 (push x keyword-parameters))
1682 (rest (incf nrest)))))
1683 (when (and restp (zerop nrest))
1684 (error "Error in lambda-list:~%~
1685 After &REST, a DEFGENERIC lambda-list ~
1686 must be followed by at least one variable."))
1687 (values nrequired noptional keysp restp allow-other-keys-p
1689 (reverse keyword-parameters)))))
1691 (defun keyword-spec-name (x)
1692 (let ((key (if (atom x) x (car x))))
1697 (defun ftype-declaration-from-lambda-list (lambda-list name)
1698 (multiple-value-bind (nrequired noptional keysp restp allow-other-keys-p
1699 keywords keyword-parameters)
1700 (analyze-lambda-list lambda-list)
1701 (declare (ignore keyword-parameters))
1702 (let* ((old (info :function :type name)) ;FIXME:FDOCUMENTATION instead?
1703 (old-ftype (if (fun-type-p old) old nil))
1704 (old-restp (and old-ftype (fun-type-rest old-ftype)))
1705 (old-keys (and old-ftype
1706 (mapcar #'key-info-name
1709 (old-keysp (and old-ftype (fun-type-keyp old-ftype)))
1710 (old-allowp (and old-ftype
1711 (fun-type-allowp old-ftype)))
1712 (keywords (union old-keys (mapcar #'keyword-spec-name keywords))))
1713 `(function ,(append (make-list nrequired :initial-element t)
1714 (when (plusp noptional)
1715 (append '(&optional)
1716 (make-list noptional :initial-element t)))
1717 (when (or restp old-restp)
1719 (when (or keysp old-keysp)
1721 (mapcar (lambda (key)
1724 (when (or allow-other-keys-p old-allowp)
1725 '(&allow-other-keys)))))
1728 ;;;; early generic function support
1730 (defvar *!early-generic-functions* ())
1732 (defun ensure-generic-function (fun-name
1734 &key environment definition-source
1736 (declare (ignore environment))
1737 (let ((existing (and (fboundp fun-name)
1738 (gdefinition fun-name))))
1739 (cond ((and existing
1740 (eq **boot-state** 'complete)
1741 (null (generic-function-p existing)))
1742 (generic-clobbers-function fun-name)
1743 (fmakunbound fun-name)
1744 (apply #'ensure-generic-function fun-name all-keys))
1746 (apply #'ensure-generic-function-using-class
1747 existing fun-name all-keys)))))
1749 (defun generic-clobbers-function (fun-name)
1750 (cerror "Replace the function binding"
1751 'simple-program-error
1752 :format-control "~S already names an ordinary function or a macro."
1753 :format-arguments (list fun-name)))
1755 (defvar *sgf-wrapper*
1756 (!boot-make-wrapper (early-class-size 'standard-generic-function)
1757 'standard-generic-function))
1759 (defvar *sgf-slots-init*
1760 (mapcar (lambda (canonical-slot)
1761 (if (memq (getf canonical-slot :name) '(arg-info source))
1763 (let ((initfunction (getf canonical-slot :initfunction)))
1765 (funcall initfunction)
1767 (early-collect-inheritance 'standard-generic-function)))
1769 (defconstant +sgf-method-class-index+
1770 (!bootstrap-slot-index 'standard-generic-function 'method-class))
1772 (defun early-gf-p (x)
1773 (and (fsc-instance-p x)
1774 (eq (clos-slots-ref (get-slots x) +sgf-method-class-index+)
1777 (defconstant +sgf-methods-index+
1778 (!bootstrap-slot-index 'standard-generic-function 'methods))
1780 (defmacro early-gf-methods (gf)
1781 `(clos-slots-ref (get-slots ,gf) +sgf-methods-index+))
1783 (defun safe-generic-function-methods (generic-function)
1784 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
1785 (clos-slots-ref (get-slots generic-function) +sgf-methods-index+)
1786 (generic-function-methods generic-function)))
1788 (defconstant +sgf-arg-info-index+
1789 (!bootstrap-slot-index 'standard-generic-function 'arg-info))
1791 (defmacro early-gf-arg-info (gf)
1792 `(clos-slots-ref (get-slots ,gf) +sgf-arg-info-index+))
1794 (defconstant +sgf-dfun-state-index+
1795 (!bootstrap-slot-index 'standard-generic-function 'dfun-state))
1797 (defstruct (arg-info
1799 (:constructor make-arg-info ())
1801 (arg-info-lambda-list :no-lambda-list)
1804 arg-info-number-optional
1806 arg-info-keys ;nil no &KEY or &REST allowed
1807 ;(k1 k2 ..) Each method must accept these &KEY arguments.
1808 ;T must have &KEY or &REST
1810 gf-info-simple-accessor-type ; nil, reader, writer, boundp
1811 (gf-precompute-dfun-and-emf-p nil) ; set by set-arg-info
1813 gf-info-static-c-a-m-emf
1814 (gf-info-c-a-m-emf-std-p t)
1817 #-sb-fluid (declaim (sb-ext:freeze-type arg-info))
1819 (defun arg-info-valid-p (arg-info)
1820 (not (null (arg-info-number-optional arg-info))))
1822 (defun arg-info-applyp (arg-info)
1823 (or (plusp (arg-info-number-optional arg-info))
1824 (arg-info-key/rest-p arg-info)))
1826 (defun arg-info-number-required (arg-info)
1827 (length (arg-info-metatypes arg-info)))
1829 (defun arg-info-nkeys (arg-info)
1830 (count-if (lambda (x) (neq x t)) (arg-info-metatypes arg-info)))
1832 (defun create-gf-lambda-list (lambda-list)
1833 ;;; Create a gf lambda list from a method lambda list
1834 (loop for x in lambda-list
1835 collect (if (consp x) (list (car x)) x)
1836 if (eq x '&key) do (loop-finish)))
1838 (defun set-arg-info (gf &key new-method (lambda-list nil lambda-list-p)
1839 argument-precedence-order)
1840 (let* ((arg-info (if (eq **boot-state** 'complete)
1842 (early-gf-arg-info gf)))
1843 (methods (if (eq **boot-state** 'complete)
1844 (generic-function-methods gf)
1845 (early-gf-methods gf)))
1846 (was-valid-p (integerp (arg-info-number-optional arg-info)))
1847 (first-p (and new-method (null (cdr methods)))))
1848 (when (and (not lambda-list-p) methods)
1849 (setq lambda-list (gf-lambda-list gf)))
1850 (when (or lambda-list-p
1852 (eq (arg-info-lambda-list arg-info) :no-lambda-list)))
1853 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1854 (analyze-lambda-list lambda-list)
1855 (when (and methods (not first-p))
1856 (let ((gf-nreq (arg-info-number-required arg-info))
1857 (gf-nopt (arg-info-number-optional arg-info))
1858 (gf-key/rest-p (arg-info-key/rest-p arg-info)))
1859 (unless (and (= nreq gf-nreq)
1861 (eq (or keysp restp) gf-key/rest-p))
1862 (error "The lambda-list ~S is incompatible with ~
1863 existing methods of ~S."
1865 (setf (arg-info-lambda-list arg-info)
1868 (create-gf-lambda-list lambda-list)))
1869 (when (or lambda-list-p argument-precedence-order
1870 (null (arg-info-precedence arg-info)))
1871 (setf (arg-info-precedence arg-info)
1872 (compute-precedence lambda-list nreq argument-precedence-order)))
1873 (setf (arg-info-metatypes arg-info) (make-list nreq))
1874 (setf (arg-info-number-optional arg-info) nopt)
1875 (setf (arg-info-key/rest-p arg-info) (not (null (or keysp restp))))
1876 (setf (arg-info-keys arg-info)
1878 (if allow-other-keys-p t keywords)
1879 (arg-info-key/rest-p arg-info)))))
1881 (check-method-arg-info gf arg-info new-method))
1882 (set-arg-info1 gf arg-info new-method methods was-valid-p first-p)
1885 (defun check-method-arg-info (gf arg-info method)
1886 (multiple-value-bind (nreq nopt keysp restp allow-other-keys-p keywords)
1887 (analyze-lambda-list (if (consp method)
1888 (early-method-lambda-list method)
1889 (method-lambda-list method)))
1890 (flet ((lose (string &rest args)
1891 (error 'simple-program-error
1892 :format-control "~@<attempt to add the method~2I~_~S~I~_~
1893 to the generic function~2I~_~S;~I~_~
1895 :format-arguments (list method gf string args)))
1896 (comparison-description (x y)
1897 (if (> x y) "more" "fewer")))
1898 (let ((gf-nreq (arg-info-number-required arg-info))
1899 (gf-nopt (arg-info-number-optional arg-info))
1900 (gf-key/rest-p (arg-info-key/rest-p arg-info))
1901 (gf-keywords (arg-info-keys arg-info)))
1902 (unless (= nreq gf-nreq)
1904 "the method has ~A required arguments than the generic function."
1905 (comparison-description nreq gf-nreq)))
1906 (unless (= nopt gf-nopt)
1908 "the method has ~A optional arguments than the generic function."
1909 (comparison-description nopt gf-nopt)))
1910 (unless (eq (or keysp restp) gf-key/rest-p)
1912 "the method and generic function differ in whether they accept~_~
1913 &REST or &KEY arguments."))
1914 (when (consp gf-keywords)
1915 (unless (or (and restp (not keysp))
1917 (every (lambda (k) (memq k keywords)) gf-keywords))
1918 (lose "the method does not accept each of the &KEY arguments~2I~_~
1922 (defconstant +sm-specializers-index+
1923 (!bootstrap-slot-index 'standard-method 'specializers))
1924 (defconstant +sm-%function-index+
1925 (!bootstrap-slot-index 'standard-method '%function))
1926 (defconstant +sm-qualifiers-index+
1927 (!bootstrap-slot-index 'standard-method 'qualifiers))
1929 ;;; FIXME: we don't actually need this; we could test for the exact
1930 ;;; class and deal with it as appropriate. In fact we probably don't
1931 ;;; need it anyway because we only use this for METHOD-SPECIALIZERS on
1932 ;;; the standard reader method for METHOD-SPECIALIZERS. Probably.
1933 (dolist (s '(specializers %function))
1934 (aver (= (symbol-value (intern (format nil "+SM-~A-INDEX+" s)))
1935 (!bootstrap-slot-index 'standard-reader-method s)
1936 (!bootstrap-slot-index 'standard-writer-method s)
1937 (!bootstrap-slot-index 'standard-boundp-method s)
1938 (!bootstrap-slot-index 'global-reader-method s)
1939 (!bootstrap-slot-index 'global-writer-method s)
1940 (!bootstrap-slot-index 'global-boundp-method s))))
1942 (defvar *standard-method-class-names*
1943 '(standard-method standard-reader-method
1944 standard-writer-method standard-boundp-method
1945 global-reader-method global-writer-method
1946 global-boundp-method))
1948 (declaim (list **standard-method-classes**))
1949 (defglobal **standard-method-classes** nil)
1951 (defun safe-method-specializers (method)
1952 (if (member (class-of method) **standard-method-classes** :test #'eq)
1953 (clos-slots-ref (std-instance-slots method) +sm-specializers-index+)
1954 (method-specializers method)))
1955 (defun safe-method-fast-function (method)
1956 (let ((mf (safe-method-function method)))
1957 (and (typep mf '%method-function)
1958 (%method-function-fast-function mf))))
1959 (defun safe-method-function (method)
1960 (if (member (class-of method) **standard-method-classes** :test #'eq)
1961 (clos-slots-ref (std-instance-slots method) +sm-%function-index+)
1962 (method-function method)))
1963 (defun safe-method-qualifiers (method)
1964 (if (member (class-of method) **standard-method-classes** :test #'eq)
1965 (clos-slots-ref (std-instance-slots method) +sm-qualifiers-index+)
1966 (method-qualifiers method)))
1968 (defun set-arg-info1 (gf arg-info new-method methods was-valid-p first-p)
1969 (let* ((existing-p (and methods (cdr methods) new-method))
1970 (nreq (length (arg-info-metatypes arg-info)))
1971 (metatypes (if existing-p
1972 (arg-info-metatypes arg-info)
1974 (type (if existing-p
1975 (gf-info-simple-accessor-type arg-info)
1977 (when (arg-info-valid-p arg-info)
1978 (dolist (method (if new-method (list new-method) methods))
1979 (let* ((specializers (if (or (eq **boot-state** 'complete)
1980 (not (consp method)))
1981 (safe-method-specializers method)
1982 (early-method-specializers method t)))
1983 (class (if (or (eq **boot-state** 'complete) (not (consp method)))
1985 (early-method-class method)))
1988 (or (not (eq **boot-state** 'complete))
1989 (eq (generic-function-method-combination gf)
1990 *standard-method-combination*)))
1991 (cond ((or (eq class *the-class-standard-reader-method*)
1992 (eq class *the-class-global-reader-method*))
1994 ((or (eq class *the-class-standard-writer-method*)
1995 (eq class *the-class-global-writer-method*))
1997 ((or (eq class *the-class-standard-boundp-method*)
1998 (eq class *the-class-global-boundp-method*))
2000 (setq metatypes (mapcar #'raise-metatype metatypes specializers))
2001 (setq type (cond ((null type) new-type)
2002 ((eq type new-type) type)
2004 (setf (arg-info-metatypes arg-info) metatypes)
2005 (setf (gf-info-simple-accessor-type arg-info) type)))
2006 (when (or (not was-valid-p) first-p)
2007 (multiple-value-bind (c-a-m-emf std-p)
2010 (compute-applicable-methods-emf gf))
2011 (setf (gf-info-static-c-a-m-emf arg-info) c-a-m-emf)
2012 (setf (gf-info-c-a-m-emf-std-p arg-info) std-p)
2013 (unless (gf-info-c-a-m-emf-std-p arg-info)
2014 (setf (gf-info-simple-accessor-type arg-info) t))))
2016 (let ((name (if (eq **boot-state** 'complete)
2017 (generic-function-name gf)
2018 (!early-gf-name gf))))
2019 (setf (gf-precompute-dfun-and-emf-p arg-info)
2023 *internal-pcl-generalized-fun-name-symbols*))
2025 (t (let* ((symbol (fun-name-block-name name))
2026 (package (symbol-package symbol)))
2027 (and (or (eq package *pcl-package*)
2028 (memq package (package-use-list *pcl-package*)))
2029 (not (eq package #.(find-package "CL")))
2030 ;; FIXME: this test will eventually be
2031 ;; superseded by the *internal-pcl...* test,
2032 ;; above. While we are in a process of
2033 ;; transition, however, it should probably
2035 (not (find #\Space (symbol-name symbol))))))))))
2036 (setf (gf-info-fast-mf-p arg-info)
2037 (or (not (eq **boot-state** 'complete))
2038 (let* ((method-class (generic-function-method-class gf))
2039 (methods (compute-applicable-methods
2040 #'make-method-lambda
2041 (list gf (class-prototype method-class)
2043 (and methods (null (cdr methods))
2044 (let ((specls (method-specializers (car methods))))
2045 (and (classp (car specls))
2046 (eq 'standard-generic-function
2047 (class-name (car specls)))
2048 (classp (cadr specls))
2049 (eq 'standard-method
2050 (class-name (cadr specls)))))))))
2053 ;;; This is the early definition of ENSURE-GENERIC-FUNCTION-USING-CLASS.
2055 ;;; The STATIC-SLOTS field of the funcallable instances used as early
2056 ;;; generic functions is used to store the early methods and early
2057 ;;; discriminator code for the early generic function. The static
2058 ;;; slots field of the fins contains a list whose:
2059 ;;; CAR - a list of the early methods on this early gf
2060 ;;; CADR - the early discriminator code for this method
2061 (defun ensure-generic-function-using-class (existing spec &rest keys
2062 &key (lambda-list nil
2064 argument-precedence-order
2068 (declare (ignore keys))
2069 (cond ((and existing (early-gf-p existing))
2071 (set-arg-info existing :lambda-list lambda-list))
2073 ((assoc spec *!generic-function-fixups* :test #'equal)
2075 (make-early-gf spec lambda-list lambda-list-p existing
2076 argument-precedence-order definition-source
2078 (bug "The function ~S is not already defined." spec)))
2080 (bug "~S should be on the list ~S."
2081 spec '*!generic-function-fixups*))
2083 (pushnew spec *!early-generic-functions* :test #'equal)
2084 (make-early-gf spec lambda-list lambda-list-p nil
2085 argument-precedence-order definition-source
2088 (defun make-early-gf (spec &optional lambda-list lambda-list-p
2089 function argument-precedence-order source-location
2091 (let ((fin (allocate-standard-funcallable-instance
2092 *sgf-wrapper* *sgf-slots-init*)))
2093 (set-funcallable-instance-function
2096 (if (eq spec 'print-object)
2097 #'(lambda (instance stream)
2098 (print-unreadable-object (instance stream :identity t)
2099 (format stream "std-instance")))
2100 #'(lambda (&rest args)
2101 (declare (ignore args))
2102 (error "The function of the funcallable-instance ~S~
2103 has not been set." fin)))))
2104 (setf (gdefinition spec) fin)
2105 (!bootstrap-set-slot 'standard-generic-function fin 'name spec)
2106 (!bootstrap-set-slot 'standard-generic-function fin
2107 'source source-location)
2108 (!bootstrap-set-slot 'standard-generic-function fin
2109 '%documentation documentation)
2110 (set-fun-name fin spec)
2111 (let ((arg-info (make-arg-info)))
2112 (setf (early-gf-arg-info fin) arg-info)
2114 (setf (info :function :type spec)
2116 (ftype-declaration-from-lambda-list lambda-list spec))
2117 (info :function :where-from spec) :defined-method)
2118 (if argument-precedence-order
2120 :lambda-list lambda-list
2121 :argument-precedence-order argument-precedence-order)
2122 (set-arg-info fin :lambda-list lambda-list))))
2125 (defun safe-gf-dfun-state (generic-function)
2126 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2127 (clos-slots-ref (fsc-instance-slots generic-function) +sgf-dfun-state-index+)
2128 (gf-dfun-state generic-function)))
2129 (defun (setf safe-gf-dfun-state) (new-value generic-function)
2130 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2131 (setf (clos-slots-ref (fsc-instance-slots generic-function)
2132 +sgf-dfun-state-index+)
2134 (setf (gf-dfun-state generic-function) new-value)))
2136 (defun set-dfun (gf &optional dfun cache info)
2137 (let ((new-state (if (and dfun (or cache info))
2138 (list* dfun cache info)
2141 ((eq **boot-state** 'complete)
2142 ;; Check that we are under the lock.
2144 (aver (eq sb-thread:*current-thread* (sb-thread:mutex-owner (gf-lock gf))))
2145 (setf (safe-gf-dfun-state gf) new-state))
2147 (setf (clos-slots-ref (get-slots gf) +sgf-dfun-state-index+)
2151 (defun gf-dfun-cache (gf)
2152 (let ((state (if (eq **boot-state** 'complete)
2153 (safe-gf-dfun-state gf)
2154 (clos-slots-ref (get-slots gf) +sgf-dfun-state-index+))))
2157 (cons (cadr state)))))
2159 (defun gf-dfun-info (gf)
2160 (let ((state (if (eq **boot-state** 'complete)
2161 (safe-gf-dfun-state gf)
2162 (clos-slots-ref (get-slots gf) +sgf-dfun-state-index+))))
2165 (cons (cddr state)))))
2167 (defconstant +sgf-name-index+
2168 (!bootstrap-slot-index 'standard-generic-function 'name))
2170 (defun !early-gf-name (gf)
2171 (clos-slots-ref (get-slots gf) +sgf-name-index+))
2173 (defun gf-lambda-list (gf)
2174 (let ((arg-info (if (eq **boot-state** 'complete)
2176 (early-gf-arg-info gf))))
2177 (if (eq :no-lambda-list (arg-info-lambda-list arg-info))
2178 (let ((methods (if (eq **boot-state** 'complete)
2179 (generic-function-methods gf)
2180 (early-gf-methods gf))))
2183 (warn "no way to determine the lambda list for ~S" gf)
2185 (let* ((method (car (last methods)))
2186 (ll (if (consp method)
2187 (early-method-lambda-list method)
2188 (method-lambda-list method))))
2189 (create-gf-lambda-list ll))))
2190 (arg-info-lambda-list arg-info))))
2192 (defmacro real-ensure-gf-internal (gf-class all-keys env)
2194 (cond ((symbolp ,gf-class)
2195 (setq ,gf-class (find-class ,gf-class t ,env)))
2196 ((classp ,gf-class))
2198 (error "The :GENERIC-FUNCTION-CLASS argument (~S) was neither a~%~
2199 class nor a symbol that names a class."
2201 (unless (class-finalized-p ,gf-class)
2202 (if (class-has-a-forward-referenced-superclass-p ,gf-class)
2203 ;; FIXME: reference MOP documentation -- this is an
2204 ;; additional requirement on our users
2205 (error "The generic function class ~S is not finalizeable" ,gf-class)
2206 (finalize-inheritance ,gf-class)))
2207 (remf ,all-keys :generic-function-class)
2208 (remf ,all-keys :environment)
2209 (let ((combin (getf ,all-keys :method-combination)))
2212 (setf (getf ,all-keys :method-combination)
2213 (find-method-combination (class-prototype ,gf-class)
2216 ((or null method-combination))))
2217 (let ((method-class (getf ,all-keys :method-class '.shes-not-there.)))
2218 (unless (eq method-class '.shes-not-there.)
2219 (setf (getf ,all-keys :method-class)
2220 (cond ((classp method-class)
2222 (t (find-class method-class t ,env))))))))
2224 (defun note-gf-signature (fun-name lambda-list-p lambda-list)
2225 (unless lambda-list-p
2226 ;; Use the existing lambda-list, if any. It is reasonable to do eg.
2228 ;; (if (fboundp name)
2229 ;; (ensure-generic-function name)
2230 ;; (ensure-generic-function name :lambda-list '(foo)))
2232 ;; in which case we end up here with no lambda-list in the first leg.
2233 (setf (values lambda-list lambda-list-p)
2235 (values (generic-function-lambda-list (fdefinition fun-name))
2237 ((or warning error) ()
2238 (values nil nil)))))
2242 (ftype-declaration-from-lambda-list lambda-list fun-name)
2245 ;; FIXME: Ideally we would like to not clobber it, but because generic
2246 ;; functions assert their FTYPEs callers believing the FTYPE are left with
2247 ;; unsafe assumptions. Hence the clobbering. Be quiet when the new type
2248 ;; is a subtype of the old one, though -- even though the type is not
2249 ;; trusted anymore, the warning is still not quite as interesting.
2250 (when (and (eq :declared (info :function :where-from fun-name))
2251 (not (csubtypep gf-type (setf old-type (info :function :type fun-name)))))
2252 (style-warn "~@<Generic function ~S clobbers an earlier ~S proclamation ~S ~
2253 for the same name with ~S.~:@>"
2255 (type-specifier old-type)
2256 (type-specifier gf-type)))
2257 (setf (info :function :type fun-name) gf-type
2258 (info :function :where-from fun-name) :defined-method)
2261 (defun real-ensure-gf-using-class--generic-function
2265 &key environment (lambda-list nil lambda-list-p)
2266 (generic-function-class 'standard-generic-function)
2268 (real-ensure-gf-internal generic-function-class all-keys environment)
2269 ;; KLUDGE: the above macro does SETQ on GENERIC-FUNCTION-CLASS,
2270 ;; which is what makes the next line work
2271 (unless (eq (class-of existing) generic-function-class)
2272 (change-class existing generic-function-class))
2274 (apply #'reinitialize-instance existing all-keys)
2275 (note-gf-signature fun-name lambda-list-p lambda-list)))
2277 (defun real-ensure-gf-using-class--null
2281 &key environment (lambda-list nil lambda-list-p)
2282 (generic-function-class 'standard-generic-function)
2284 (declare (ignore existing))
2285 (real-ensure-gf-internal generic-function-class all-keys environment)
2287 (setf (gdefinition fun-name)
2288 (apply #'make-instance generic-function-class
2289 :name fun-name all-keys))
2290 (note-gf-signature fun-name lambda-list-p lambda-list)))
2292 (defun safe-gf-arg-info (generic-function)
2293 (if (eq (class-of generic-function) *the-class-standard-generic-function*)
2294 (clos-slots-ref (fsc-instance-slots generic-function)
2295 +sgf-arg-info-index+)
2296 (gf-arg-info generic-function)))
2298 ;;; FIXME: this function took on a slightly greater role than it
2299 ;;; previously had around 2005-11-02, when CSR fixed the bug whereby
2300 ;;; having more than one subclass of standard-generic-function caused
2301 ;;; the whole system to die horribly through a metacircle in
2302 ;;; GF-ARG-INFO. The fix is to be slightly more disciplined about
2303 ;;; calling accessor methods -- we call GET-GENERIC-FUN-INFO when
2304 ;;; computing discriminating functions, so we need to be careful about
2305 ;;; having a base case for the recursion, and we provide that with the
2306 ;;; STANDARD-GENERIC-FUNCTION case below. However, we are not (yet)
2307 ;;; as disciplined as CLISP's CLOS/MOP, and it would be nice to get to
2308 ;;; that stage, where all potentially dangerous cases are enumerated
2309 ;;; and stopped. -- CSR, 2005-11-02.
2310 (defun get-generic-fun-info (gf)
2311 ;; values nreq applyp metatypes nkeys arg-info
2312 (multiple-value-bind (applyp metatypes arg-info)
2313 (let* ((arg-info (if (early-gf-p gf)
2314 (early-gf-arg-info gf)
2315 (safe-gf-arg-info gf)))
2316 (metatypes (arg-info-metatypes arg-info)))
2317 (values (arg-info-applyp arg-info)
2322 (declare (fixnum nreq nkeys))
2323 (dolist (x metatypes)
2327 (values nreq applyp metatypes
2331 (defun generic-function-nreq (gf)
2332 (let* ((arg-info (if (early-gf-p gf)
2333 (early-gf-arg-info gf)
2334 (safe-gf-arg-info gf)))
2335 (metatypes (arg-info-metatypes arg-info)))
2336 (declare (list metatypes))
2337 (length metatypes)))
2339 (defun early-make-a-method (class qualifiers arglist specializers initargs doc
2340 &key slot-name object-class method-class-function
2344 ;; Figure out whether we got class objects or class names as the
2345 ;; specializers and set parsed and unparsed appropriately. If we
2346 ;; got class objects, then we can compute unparsed, but if we got
2347 ;; class names we don't try to compute parsed.
2349 ;; Note that the use of not symbolp in this call to every should be
2350 ;; read as 'classp' we can't use classp itself because it doesn't
2352 (if (every (lambda (s) (not (symbolp s))) specializers)
2353 (setq parsed specializers
2354 unparsed (mapcar (lambda (s)
2355 (if (eq s t) t (class-name s)))
2357 (setq unparsed specializers
2362 (getf initargs :function)
2363 (let ((mf (getf initargs :function)))
2365 (and (typep mf '%method-function)
2366 (%method-function-fast-function mf)))
2368 ;; the parsed specializers. This is used by
2369 ;; EARLY-METHOD-SPECIALIZERS to cache the parse.
2370 ;; Note that this only comes into play when there is
2371 ;; more than one early method on an early gf.
2374 ;; A list to which REAL-MAKE-A-METHOD can be applied
2375 ;; to make a real method corresponding to this early
2378 (list class qualifiers arglist unparsed
2381 (list :slot-name slot-name :object-class object-class
2382 :method-class-function method-class-function))
2383 (list :definition-source definition-source)))))
2384 (initialize-method-function initargs result)
2387 (defun real-make-a-method
2388 (class qualifiers lambda-list specializers initargs doc
2389 &rest args &key slot-name object-class method-class-function
2391 (if method-class-function
2392 (let* ((object-class (if (classp object-class) object-class
2393 (find-class object-class)))
2394 (slots (class-direct-slots object-class))
2395 (slot-definition (find slot-name slots
2396 :key #'slot-definition-name)))
2398 (aver slot-definition)
2399 (let ((initargs (list* :qualifiers qualifiers :lambda-list lambda-list
2400 :specializers specializers :documentation doc
2401 :slot-definition slot-definition
2402 :slot-name slot-name initargs)))
2403 (apply #'make-instance
2404 (apply method-class-function object-class slot-definition
2406 :definition-source definition-source
2408 (apply #'make-instance class :qualifiers qualifiers
2409 :lambda-list lambda-list :specializers specializers
2410 :documentation doc (append args initargs))))
2412 (defun early-method-function (early-method)
2413 (values (cadr early-method) (caddr early-method)))
2415 (defun early-method-class (early-method)
2416 (find-class (car (fifth early-method))))
2418 (defun early-method-standard-accessor-p (early-method)
2419 (let ((class (first (fifth early-method))))
2420 (or (eq class 'standard-reader-method)
2421 (eq class 'standard-writer-method)
2422 (eq class 'standard-boundp-method))))
2424 (defun early-method-standard-accessor-slot-name (early-method)
2425 (eighth (fifth early-method)))
2427 ;;; Fetch the specializers of an early method. This is basically just
2428 ;;; a simple accessor except that when the second argument is t, this
2429 ;;; converts the specializers from symbols into class objects. The
2430 ;;; class objects are cached in the early method, this makes
2431 ;;; bootstrapping faster because the class objects only have to be
2435 ;;; The second argument should only be passed as T by
2436 ;;; early-lookup-method. This is to implement the rule that only when
2437 ;;; there is more than one early method on a generic function is the
2438 ;;; conversion from class names to class objects done. This
2439 ;;; corresponds to the fact that we are only allowed to have one
2440 ;;; method on any generic function up until the time classes exist.
2441 (defun early-method-specializers (early-method &optional objectsp)
2442 (if (and (listp early-method)
2443 (eq (car early-method) :early-method))
2444 (cond ((eq objectsp t)
2445 (or (fourth early-method)
2446 (setf (fourth early-method)
2447 (mapcar #'find-class (cadddr (fifth early-method))))))
2449 (fourth (fifth early-method))))
2450 (error "~S is not an early-method." early-method)))
2452 (defun early-method-qualifiers (early-method)
2453 (second (fifth early-method)))
2455 (defun early-method-lambda-list (early-method)
2456 (third (fifth early-method)))
2458 (defun early-method-initargs (early-method)
2459 (fifth (fifth early-method)))
2461 (defun (setf early-method-initargs) (new-value early-method)
2462 (setf (fifth (fifth early-method)) new-value))
2464 (defun early-add-named-method (generic-function-name qualifiers
2465 specializers arglist &rest initargs
2466 &key documentation definition-source
2468 (let* (;; we don't need to deal with the :generic-function-class
2469 ;; argument here because the default,
2470 ;; STANDARD-GENERIC-FUNCTION, is right for all early generic
2471 ;; functions. (See REAL-ADD-NAMED-METHOD)
2472 (gf (ensure-generic-function generic-function-name))
2474 (dolist (m (early-gf-methods gf))
2475 (when (and (equal (early-method-specializers m) specializers)
2476 (equal (early-method-qualifiers m) qualifiers))
2478 (setf (getf (getf initargs 'plist) :name)
2479 (make-method-spec gf qualifiers specializers))
2480 (let ((new (make-a-method 'standard-method qualifiers arglist
2481 specializers initargs documentation
2482 :definition-source definition-source)))
2483 (when existing (remove-method gf existing))
2484 (add-method gf new))))
2486 ;;; This is the early version of ADD-METHOD. Later this will become a
2487 ;;; generic function. See !FIX-EARLY-GENERIC-FUNCTIONS which has
2488 ;;; special knowledge about ADD-METHOD.
2489 (defun add-method (generic-function method)
2490 (when (not (fsc-instance-p generic-function))
2491 (error "Early ADD-METHOD didn't get a funcallable instance."))
2492 (when (not (and (listp method) (eq (car method) :early-method)))
2493 (error "Early ADD-METHOD didn't get an early method."))
2494 (push method (early-gf-methods generic-function))
2495 (set-arg-info generic-function :new-method method)
2496 (unless (assoc (!early-gf-name generic-function)
2497 *!generic-function-fixups*
2499 (update-dfun generic-function)))
2501 ;;; This is the early version of REMOVE-METHOD. See comments on
2502 ;;; the early version of ADD-METHOD.
2503 (defun remove-method (generic-function method)
2504 (when (not (fsc-instance-p generic-function))
2505 (error "An early remove-method didn't get a funcallable instance."))
2506 (when (not (and (listp method) (eq (car method) :early-method)))
2507 (error "An early remove-method didn't get an early method."))
2508 (setf (early-gf-methods generic-function)
2509 (remove method (early-gf-methods generic-function)))
2510 (set-arg-info generic-function)
2511 (unless (assoc (!early-gf-name generic-function)
2512 *!generic-function-fixups*
2514 (update-dfun generic-function)))
2516 ;;; This is the early version of GET-METHOD. See comments on the early
2517 ;;; version of ADD-METHOD.
2518 (defun get-method (generic-function qualifiers specializers
2519 &optional (errorp t))
2520 (if (early-gf-p generic-function)
2521 (or (dolist (m (early-gf-methods generic-function))
2522 (when (and (or (equal (early-method-specializers m nil)
2524 (equal (early-method-specializers m t)
2526 (equal (early-method-qualifiers m) qualifiers))
2529 (error "can't get early method")
2531 (real-get-method generic-function qualifiers specializers errorp)))
2533 (defun !fix-early-generic-functions ()
2534 (let ((accessors nil))
2535 ;; Rearrange *!EARLY-GENERIC-FUNCTIONS* to speed up
2536 ;; FIX-EARLY-GENERIC-FUNCTIONS.
2537 (dolist (early-gf-spec *!early-generic-functions*)
2538 (when (every #'early-method-standard-accessor-p
2539 (early-gf-methods (gdefinition early-gf-spec)))
2540 (push early-gf-spec accessors)))
2541 (dolist (spec (nconc accessors
2542 '(accessor-method-slot-name
2543 generic-function-methods
2548 slot-definition-location
2549 slot-definition-name
2552 class-precedence-list
2553 slot-boundp-using-class
2554 (setf slot-value-using-class)
2555 slot-value-using-class
2558 funcallable-standard-class-p
2561 (setq *!early-generic-functions*
2563 (delete spec *!early-generic-functions* :test #'equal))))
2565 (dolist (early-gf-spec *!early-generic-functions*)
2566 (/show early-gf-spec)
2567 (let* ((gf (gdefinition early-gf-spec))
2568 (methods (mapcar (lambda (early-method)
2569 (let ((args (copy-list (fifth
2572 (early-method-specializers
2574 (apply #'real-make-a-method args)))
2575 (early-gf-methods gf))))
2576 (setf (generic-function-method-class gf) *the-class-standard-method*)
2577 (setf (generic-function-method-combination gf)
2578 *standard-method-combination*)
2579 (set-methods gf methods)))
2581 (dolist (fn *!early-functions*)
2583 (setf (gdefinition (car fn)) (fdefinition (caddr fn))))
2585 (dolist (fixup *!generic-function-fixups*)
2587 (let* ((fspec (car fixup))
2588 (gf (gdefinition fspec))
2589 (methods (mapcar (lambda (method)
2590 (let* ((lambda-list (first method))
2591 (specializers (mapcar #'find-class (second method)))
2592 (method-fn-name (third method))
2593 (fn-name (or method-fn-name fspec))
2594 (fn (fdefinition fn-name))
2598 (lambda (args next-methods)
2602 `(call ,fn-name)))))
2603 (declare (type function fn))
2604 (make-a-method 'standard-method
2611 (setf (generic-function-method-class gf) *the-class-standard-method*)
2612 (setf (generic-function-method-combination gf)
2613 *standard-method-combination*)
2614 (set-methods gf methods))))
2615 (/show "leaving !FIX-EARLY-GENERIC-FUNCTIONS"))
2617 ;;; PARSE-DEFMETHOD is used by DEFMETHOD to parse the &REST argument
2618 ;;; into the 'real' arguments. This is where the syntax of DEFMETHOD
2619 ;;; is really implemented.
2620 (defun parse-defmethod (cdr-of-form)
2621 (declare (list cdr-of-form))
2622 (let ((qualifiers ())
2624 (loop (if (and (car cdr-of-form) (atom (car cdr-of-form)))
2625 (push (pop cdr-of-form) qualifiers)
2626 (return (setq qualifiers (nreverse qualifiers)))))
2627 (setq spec-ll (pop cdr-of-form))
2628 (values qualifiers spec-ll cdr-of-form)))
2630 (defun parse-specializers (generic-function specializers)
2631 (declare (list specializers))
2632 (flet ((parse (spec)
2633 (parse-specializer-using-class generic-function spec)))
2634 (mapcar #'parse specializers)))
2636 (defun unparse-specializers (generic-function specializers)
2637 (declare (list specializers))
2638 (flet ((unparse (spec)
2639 (unparse-specializer-using-class generic-function spec)))
2640 (mapcar #'unparse specializers)))
2642 (defun extract-parameters (specialized-lambda-list)
2643 (multiple-value-bind (parameters ignore1 ignore2)
2644 (parse-specialized-lambda-list specialized-lambda-list)
2645 (declare (ignore ignore1 ignore2))
2648 (defun extract-lambda-list (specialized-lambda-list)
2649 (multiple-value-bind (ignore1 lambda-list ignore2)
2650 (parse-specialized-lambda-list specialized-lambda-list)
2651 (declare (ignore ignore1 ignore2))
2654 (defun extract-specializer-names (specialized-lambda-list)
2655 (multiple-value-bind (ignore1 ignore2 specializers)
2656 (parse-specialized-lambda-list specialized-lambda-list)
2657 (declare (ignore ignore1 ignore2))
2660 (defun extract-required-parameters (specialized-lambda-list)
2661 (multiple-value-bind (ignore1 ignore2 ignore3 required-parameters)
2662 (parse-specialized-lambda-list specialized-lambda-list)
2663 (declare (ignore ignore1 ignore2 ignore3))
2664 required-parameters))
2666 (define-condition specialized-lambda-list-error
2667 (reference-condition simple-program-error)
2669 (:default-initargs :references (list '(:ansi-cl :section (3 4 3)))))
2671 (defun parse-specialized-lambda-list
2673 &optional supplied-keywords (allowed-keywords '(&optional &rest &key &aux))
2674 &aux (specialized-lambda-list-keywords
2675 '(&optional &rest &key &allow-other-keys &aux)))
2676 (let ((arg (car arglist)))
2677 (cond ((null arglist) (values nil nil nil nil))
2679 (values nil arglist nil nil))
2680 ((memq arg lambda-list-keywords)
2681 ;; non-standard lambda-list-keywords are errors.
2682 (unless (memq arg specialized-lambda-list-keywords)
2683 (error 'specialized-lambda-list-error
2684 :format-control "unknown specialized-lambda-list ~
2686 :format-arguments (list arg)))
2687 ;; no multiple &rest x &rest bla specifying
2688 (when (memq arg supplied-keywords)
2689 (error 'specialized-lambda-list-error
2690 :format-control "multiple occurrence of ~
2691 specialized-lambda-list keyword ~S~%"
2692 :format-arguments (list arg)))
2693 ;; And no placing &key in front of &optional, either.
2694 (unless (memq arg allowed-keywords)
2695 (error 'specialized-lambda-list-error
2696 :format-control "misplaced specialized-lambda-list ~
2698 :format-arguments (list arg)))
2699 ;; When we are at a lambda-list keyword, the parameters
2700 ;; don't include the lambda-list keyword; the lambda-list
2701 ;; does include the lambda-list keyword; and no
2702 ;; specializers are allowed to follow the lambda-list
2703 ;; keywords (at least for now).
2704 (multiple-value-bind (parameters lambda-list)
2705 (parse-specialized-lambda-list (cdr arglist)
2706 (cons arg supplied-keywords)
2708 (cons '&allow-other-keys
2709 (cdr (member arg allowed-keywords)))
2710 (cdr (member arg allowed-keywords))))
2711 (when (and (eq arg '&rest)
2712 (or (null lambda-list)
2713 (memq (car lambda-list)
2714 specialized-lambda-list-keywords)
2715 (not (or (null (cadr lambda-list))
2716 (memq (cadr lambda-list)
2717 specialized-lambda-list-keywords)))))
2718 (error 'specialized-lambda-list-error
2720 "in a specialized-lambda-list, excactly one ~
2721 variable must follow &REST.~%"
2722 :format-arguments nil))
2724 (cons arg lambda-list)
2728 ;; After a lambda-list keyword there can be no specializers.
2729 (multiple-value-bind (parameters lambda-list)
2730 (parse-specialized-lambda-list (cdr arglist)
2733 (values (cons (if (listp arg) (car arg) arg) parameters)
2734 (cons arg lambda-list)
2738 (multiple-value-bind (parameters lambda-list specializers required)
2739 (parse-specialized-lambda-list (cdr arglist))
2740 ;; Check for valid arguments.
2741 (unless (or (and (symbolp arg) (not (null arg)))
2745 (error 'specialized-lambda-list-error
2746 :format-control "arg is not a non-NIL symbol or a list of two elements: ~A"
2747 :format-arguments (list arg)))
2748 (values (cons (if (listp arg) (car arg) arg) parameters)
2749 (cons (if (listp arg) (car arg) arg) lambda-list)
2750 (cons (if (listp arg) (cadr arg) t) specializers)
2751 (cons (if (listp arg) (car arg) arg) required)))))))
2753 (setq **boot-state** 'early)
2755 ;;; FIXME: In here there was a #-CMU definition of SYMBOL-MACROLET
2756 ;;; which used %WALKER stuff. That suggests to me that maybe the code
2757 ;;; walker stuff was only used for implementing stuff like that; maybe
2758 ;;; it's not needed any more? Hunt down what it was used for and see.
2760 (defun extract-the (form)
2761 (cond ((and (consp form) (eq (car form) 'the))
2762 (aver (proper-list-of-length-p form 3))
2767 (defmacro with-slots (slots instance &body body)
2768 (let ((in (gensym)))
2769 `(let ((,in ,instance))
2770 (declare (ignorable ,in))
2771 ,@(let ((instance (extract-the instance)))
2772 (and (symbolp instance)
2773 `((declare (%variable-rebinding ,in ,instance)))))
2775 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2777 (if (symbolp slot-entry)
2781 (if (symbolp slot-entry)
2783 (cadr slot-entry))))
2785 (slot-value ,in ',slot-name))))
2789 (defmacro with-accessors (slots instance &body body)
2790 (let ((in (gensym)))
2791 `(let ((,in ,instance))
2792 (declare (ignorable ,in))
2793 ,@(let ((instance (extract-the instance)))
2794 (and (symbolp instance)
2795 `((declare (%variable-rebinding ,in ,instance)))))
2797 (symbol-macrolet ,(mapcar (lambda (slot-entry)
2798 (let ((var-name (car slot-entry))
2799 (accessor-name (cadr slot-entry)))
2800 `(,var-name (,accessor-name ,in))))
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