1 ;;;; This software is part of the SBCL system. See the README file for
4 ;;;; This software is derived from software originally released by Xerox
5 ;;;; Corporation. Copyright and release statements follow. Later modifications
6 ;;;; to the software are in the public domain and are provided with
7 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
10 ;;;; copyright information from original PCL sources:
12 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
13 ;;;; All rights reserved.
15 ;;;; Use and copying of this software and preparation of derivative works based
16 ;;;; upon this software are permitted. Any distribution of this software or
17 ;;;; derivative works must comply with all applicable United States export
20 ;;;; This software is made available AS IS, and Xerox Corporation makes no
21 ;;;; warranty about the software, its performance or its conformity to any
26 (defun get-method-function (method &optional method-alist wrappers)
27 (let ((fn (cadr (assoc method method-alist))))
29 (values fn nil nil nil)
30 (multiple-value-bind (mf fmf)
32 (early-method-function method)
33 (values nil (method-fast-function method)))
34 (let* ((pv-table (and fmf (method-function-pv-table fmf))))
35 (if (and fmf (or (null pv-table) wrappers))
36 (let* ((pv-wrappers (when pv-table
37 (pv-wrappers-from-all-wrappers
39 (pv-cell (when (and pv-table pv-wrappers)
40 (pv-table-lookup pv-table pv-wrappers))))
41 (values mf t fmf pv-cell))
43 (or mf (if (listp method)
45 (method-function-from-fast-function fmf))
46 (method-function method)))
49 (defun make-effective-method-function (generic-function form &optional
50 method-alist wrappers)
51 (funcall (make-effective-method-function1 generic-function form
52 (not (null method-alist))
53 (not (null wrappers)))
54 method-alist wrappers))
56 (defun make-effective-method-function1 (generic-function form
57 method-alist-p wrappers-p)
59 (eq (car form) 'call-method))
60 (make-effective-method-function-simple generic-function form)
61 ;; We have some sort of `real' effective method. Go off and get a
62 ;; compiled function for it. Most of the real hair here is done by
63 ;; the GET-FUN mechanism.
64 (make-effective-method-function-internal generic-function form
65 method-alist-p wrappers-p)))
67 (defun make-effective-method-fun-type (generic-function
72 (eq (car form) 'call-method))
73 (let* ((cm-args (cdr form))
74 (method (car cm-args)))
76 (if (if (listp method)
77 (eq (car method) :early-method)
81 (multiple-value-bind (mf fmf)
83 (early-method-function method)
84 (values nil (method-fast-function method)))
86 (let* ((pv-table (and fmf (method-function-pv-table fmf))))
87 (if (and fmf (or (null pv-table) wrappers-p))
90 (if (and (consp method) (eq (car method) 'make-method))
91 (make-effective-method-fun-type
92 generic-function (cadr method) method-alist-p wrappers-p)
96 (defun make-effective-method-function-simple
97 (generic-function form &optional no-fmf-p)
98 ;; The effective method is just a call to CALL-METHOD. This opens up
99 ;; the possibility of just using the method function of the method as
100 ;; the effective method function.
102 ;; But we have to be careful. If that method function will ask for
103 ;; the next methods we have to provide them. We do not look to see
104 ;; if there are next methods, we look at whether the method function
105 ;; asks about them. If it does, we must tell it whether there are
106 ;; or aren't to prevent the leaky next methods bug.
107 (let* ((cm-args (cdr form))
108 (fmf-p (and (null no-fmf-p)
109 (or (not (eq *boot-state* 'complete))
110 (gf-fast-method-function-p generic-function))
111 (null (cddr cm-args))))
112 (method (car cm-args))
113 (cm-args1 (cdr cm-args)))
114 (lambda (method-alist wrappers)
115 (make-effective-method-function-simple1 generic-function
122 (defun make-emf-from-method
123 (method cm-args &optional gf fmf-p method-alist wrappers)
124 (multiple-value-bind (mf real-mf-p fmf pv-cell)
125 (get-method-function method method-alist wrappers)
127 (let* ((next-methods (car cm-args))
128 (next (make-effective-method-function-simple1
129 gf (car next-methods)
130 (list* (cdr next-methods) (cdr cm-args))
131 fmf-p method-alist wrappers))
132 (arg-info (method-function-get fmf :arg-info)))
133 (make-fast-method-call :function fmf
135 :next-method-call next
138 (make-method-call :function mf
139 :call-method-args cm-args)
142 (defun make-effective-method-function-simple1
143 (gf method cm-args fmf-p &optional method-alist wrappers)
145 (if (if (listp method)
146 (eq (car method) :early-method)
148 (make-emf-from-method method cm-args gf fmf-p method-alist wrappers)
149 (if (and (consp method) (eq (car method) 'make-method))
150 (make-effective-method-function gf
152 method-alist wrappers)
155 (defvar *global-effective-method-gensyms* ())
156 (defvar *rebound-effective-method-gensyms*)
158 (defun get-effective-method-gensym ()
159 (or (pop *rebound-effective-method-gensyms*)
160 (let ((new (intern (format nil
161 "EFFECTIVE-METHOD-GENSYM-~D"
162 (length *global-effective-method-gensyms*))
164 (setq *global-effective-method-gensyms*
165 (append *global-effective-method-gensyms* (list new)))
168 (let ((*rebound-effective-method-gensyms* ()))
169 (dotimes-fixnum (i 10) (get-effective-method-gensym)))
171 (defun expand-effective-method-function (gf effective-method &optional env)
172 (declare (ignore env))
173 (multiple-value-bind (nreq applyp metatypes nkeys arg-info)
174 (get-generic-fun-info gf)
175 (declare (ignore nreq nkeys arg-info))
176 (let ((ll (make-fast-method-call-lambda-list metatypes applyp))
177 (error-p (eq (first effective-method) '%no-primary-method))
179 (when (eq *boot-state* 'complete)
180 ;; Otherwise the METHOD-COMBINATION slot is not bound.
181 (let ((combin (generic-function-method-combination gf)))
182 (and (long-method-combination-p combin)
183 (long-method-combination-args-lambda-list combin))))))
186 `(lambda (.pv-cell. .next-method-call. &rest .args.)
187 (declare (ignore .pv-cell. .next-method-call.))
188 (flet ((%no-primary-method (gf args)
189 (apply #'no-primary-method gf args)))
193 ;; FIXME: Ick. Shared idiom, too, with stuff in cache.lisp
195 (dotimes (i (length metatypes) (nreverse req))
196 (push (dfun-arg-symbol i) req))))
198 `(list* ,@required .dfun-rest-arg.)
199 `(list ,@required))))
201 (declare (ignore .pv-cell. .next-method-call.))
202 (let ((.gf-args. ,gf-args))
203 (declare (ignorable .gf-args.))
204 ,effective-method))))
207 (declare (ignore ,@(if error-p ll '(.pv-cell. .next-method-call.))))
208 ,effective-method))))))
210 (defun expand-emf-call-method (gf form metatypes applyp env)
211 (declare (ignore gf metatypes applyp env))
212 `(call-method ,(cdr form)))
214 (defmacro call-method (&rest args)
215 (declare (ignore args))
216 `(error "~S outside of a effective method form" 'call-method))
218 (defun memf-test-converter (form generic-function method-alist-p wrappers-p)
219 (cond ((and (consp form) (eq (car form) 'call-method))
220 (case (make-effective-method-fun-type
221 generic-function form method-alist-p wrappers-p)
226 ((and (consp form) (eq (car form) 'call-method-list))
227 (case (if (every (lambda (form)
228 (eq 'fast-method-call
229 (make-effective-method-fun-type
230 generic-function form
231 method-alist-p wrappers-p)))
236 '.fast-call-method-list.)
238 '.call-method-list.)))
240 (default-test-converter form))))
242 (defun memf-code-converter
243 (form generic-function metatypes applyp method-alist-p wrappers-p)
244 (cond ((and (consp form) (eq (car form) 'call-method))
245 (let ((gensym (get-effective-method-gensym)))
246 (values (make-emf-call metatypes applyp gensym
247 (make-effective-method-fun-type
248 generic-function form method-alist-p wrappers-p))
250 ((and (consp form) (eq (car form) 'call-method-list))
251 (let ((gensym (get-effective-method-gensym))
252 (type (if (every (lambda (form)
253 (eq 'fast-method-call
254 (make-effective-method-fun-type
255 generic-function form
256 method-alist-p wrappers-p)))
260 (values `(dolist (emf ,gensym nil)
261 ,(make-emf-call metatypes applyp 'emf type))
264 (default-code-converter form))))
266 (defun memf-constant-converter (form generic-function)
267 (cond ((and (consp form) (eq (car form) 'call-method))
269 (make-effective-method-function-simple
270 generic-function form))))
271 ((and (consp form) (eq (car form) 'call-method-list))
272 (list (cons '.meth-list.
273 (mapcar (lambda (form)
274 (make-effective-method-function-simple
275 generic-function form))
278 (default-constant-converter form))))
280 (defun make-effective-method-function-internal
281 (generic-function effective-method method-alist-p wrappers-p)
282 (multiple-value-bind (nreq applyp metatypes nkeys arg-info)
283 (get-generic-fun-info generic-function)
284 (declare (ignore nkeys arg-info))
285 (let* ((*rebound-effective-method-gensyms*
286 *global-effective-method-gensyms*)
287 (name (if (early-gf-p generic-function)
288 (!early-gf-name generic-function)
289 (generic-function-name generic-function)))
290 (arg-info (cons nreq applyp))
291 (effective-method-lambda (expand-effective-method-function
292 generic-function effective-method)))
293 (multiple-value-bind (cfunction constants)
294 (get-fun1 effective-method-lambda
296 (memf-test-converter form generic-function
297 method-alist-p wrappers-p))
299 (memf-code-converter form generic-function
301 method-alist-p wrappers-p))
303 (memf-constant-converter form generic-function)))
304 (lambda (method-alist wrappers)
306 (mapcar (lambda (constant)
310 (funcall (cdr constant)
311 method-alist wrappers))
321 (function (set-fun-name
322 (apply cfunction constants)
323 `(combined-method ,name))))
324 (make-fast-method-call :function function
325 :arg-info arg-info)))))))
327 (defmacro call-method-list (&rest calls)
330 (defun make-call-methods (methods)
332 ,@(mapcar (lambda (method) `(call-method ,method ())) methods)))
334 (defun standard-compute-effective-method (generic-function combin applicable-methods)
335 (declare (ignore combin))
340 (flet ((lose (method why)
341 (invalid-method-error
343 "The method ~S ~A.~%~
344 Standard method combination requires all methods to have one~%~
345 of the single qualifiers :AROUND, :BEFORE and :AFTER or to~%~
346 have no qualifier at all."
348 (dolist (m applicable-methods)
349 (let ((qualifiers (if (listp m)
350 (early-method-qualifiers m)
351 (method-qualifiers m))))
353 ((null qualifiers) (push m primary))
355 (lose m "has more than one qualifier"))
356 ((eq (car qualifiers) :around)
358 ((eq (car qualifiers) :before)
360 ((eq (car qualifiers) :after)
363 (lose m "has an illegal qualifier"))))))
364 (setq before (reverse before)
365 after (reverse after)
366 primary (reverse primary)
367 around (reverse around))
368 (cond ((null primary)
369 `(%no-primary-method ',generic-function .args.))
370 ((and (null before) (null after) (null around))
371 ;; By returning a single call-method `form' here we enable
372 ;; an important implementation-specific optimization.
373 `(call-method ,(first primary) ,(rest primary)))
375 (let ((main-effective-method
376 (if (or before after)
377 `(multiple-value-prog1
379 ,(make-call-methods before)
380 (call-method ,(first primary)
382 ,(make-call-methods (reverse after)))
383 `(call-method ,(first primary) ,(rest primary)))))
385 `(call-method ,(first around)
387 (make-method ,main-effective-method)))
388 main-effective-method))))))
390 ;;;; the STANDARD method combination type. This is coded by hand
391 ;;;; (rather than with DEFINE-METHOD-COMBINATION) for bootstrapping
392 ;;;; and efficiency reasons. Note that the definition of the
393 ;;;; FIND-METHOD-COMBINATION-METHOD appears in the file
394 ;;;; defcombin.lisp. This is because EQL methods can't appear in the
397 ;;;; The DEFCLASS for the METHOD-COMBINATION and
398 ;;;; STANDARD-METHOD-COMBINATION classes has to appear here for this
399 ;;;; reason. This code must conform to the code in the file
400 ;;;; defcombin.lisp, look there for more details.
402 (defun compute-effective-method (generic-function combin applicable-methods)
403 (standard-compute-effective-method generic-function
407 (defun invalid-method-error (method format-control &rest format-arguments)
408 (error "~@<invalid method error for ~2I~_~S ~I~_method: ~2I~_~?~:>"
413 (defun method-combination-error (format-control &rest format-arguments)
414 (error "~@<method combination error in CLOS dispatch: ~2I~_~?~:>"