0.9.15.19:
[sbcl.git] / src / pcl / braid.lisp
1 ;;;; bootstrapping the meta-braid
2 ;;;;
3 ;;;; The code in this file takes the early definitions that have been
4 ;;;; saved up and actually builds those class objects. This work is
5 ;;;; largely driven off of those class definitions, but the fact that
6 ;;;; STANDARD-CLASS is the class of all metaclasses in the braid is
7 ;;;; built into this code pretty deeply.
8
9 ;;;; This software is part of the SBCL system. See the README file for
10 ;;;; more information.
11
12 ;;;; This software is derived from software originally released by Xerox
13 ;;;; Corporation. Copyright and release statements follow. Later modifications
14 ;;;; to the software are in the public domain and are provided with
15 ;;;; absolutely no warranty. See the COPYING and CREDITS files for more
16 ;;;; information.
17
18 ;;;; copyright information from original PCL sources:
19 ;;;;
20 ;;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
21 ;;;; All rights reserved.
22 ;;;;
23 ;;;; Use and copying of this software and preparation of derivative works based
24 ;;;; upon this software are permitted. Any distribution of this software or
25 ;;;; derivative works must comply with all applicable United States export
26 ;;;; control laws.
27 ;;;;
28 ;;;; This software is made available AS IS, and Xerox Corporation makes no
29 ;;;; warranty about the software, its performance or its conformity to any
30 ;;;; specification.
31
32 (in-package "SB-PCL")
33 \f
34 (defun allocate-standard-instance (wrapper
35                                    &optional (slots-init nil slots-init-p))
36   (let ((instance (%make-standard-instance nil (get-instance-hash-code)))
37         (no-of-slots (wrapper-no-of-instance-slots wrapper)))
38     (setf (std-instance-wrapper instance) wrapper)
39     (setf (std-instance-slots instance)
40           (cond (slots-init-p
41                  ;; Inline the slots vector allocation and initialization.
42                  (let ((slots (make-array no-of-slots :initial-element 0)))
43                    (do ((rem-slots slots-init (rest rem-slots))
44                         (i 0 (1+ i)))
45                        ((>= i no-of-slots)) ;endp rem-slots))
46                      (declare (list rem-slots)
47                               (type index i))
48                      (setf (aref slots i) (first rem-slots)))
49                    slots))
50                 (t
51                  (make-array no-of-slots
52                              :initial-element +slot-unbound+))))
53     instance))
54
55 (defmacro allocate-funcallable-instance-slots (wrapper &optional
56                                                        slots-init-p slots-init)
57   `(let ((no-of-slots (wrapper-no-of-instance-slots ,wrapper)))
58      ,(if slots-init-p
59           `(if ,slots-init-p
60                (make-array no-of-slots :initial-contents ,slots-init)
61                (make-array no-of-slots :initial-element +slot-unbound+))
62           `(make-array no-of-slots :initial-element +slot-unbound+))))
63
64 (defun allocate-funcallable-instance (wrapper &optional
65                                               (slots-init nil slots-init-p))
66   (let ((fin (%make-pcl-funcallable-instance nil nil
67                                              (get-instance-hash-code))))
68     (set-funcallable-instance-function
69      fin
70      #'(lambda (&rest args)
71          (declare (ignore args))
72          (error "The function of the funcallable-instance ~S has not been set."
73                 fin)))
74     (setf (fsc-instance-wrapper fin) wrapper
75           (fsc-instance-slots fin) (allocate-funcallable-instance-slots
76                                     wrapper slots-init-p slots-init))
77     fin))
78
79 (defun allocate-structure-instance (wrapper &optional
80                                             (slots-init nil slots-init-p))
81   (let* ((class (wrapper-class wrapper))
82          (constructor (class-defstruct-constructor class)))
83     (if constructor
84         (let ((instance (funcall constructor))
85               (slots (class-slots class)))
86           (when slots-init-p
87             (dolist (slot slots)
88               (setf (slot-value-using-class class instance slot)
89                     (pop slots-init))))
90           instance)
91         (error "can't allocate an instance of class ~S" (class-name class)))))
92 \f
93 ;;;; BOOTSTRAP-META-BRAID
94 ;;;;
95 ;;;; This function builds the base metabraid from the early class definitions.
96
97 (defmacro !initial-classes-and-wrappers (&rest classes)
98   `(progn
99      ,@(mapcar (lambda (class)
100                  (let ((wr (format-symbol *pcl-package* "~A-WRAPPER" class)))
101                    `(setf ,wr ,(if (eq class 'standard-generic-function)
102                                    '*sgf-wrapper*
103                                    `(boot-make-wrapper
104                                      (early-class-size ',class)
105                                      ',class))
106                           ,class (allocate-standard-instance
107                                   ,(if (eq class 'standard-generic-function)
108                                        'funcallable-standard-class-wrapper
109                                        'standard-class-wrapper))
110                           (wrapper-class ,wr) ,class
111                           (find-class ',class) ,class)))
112                classes)))
113
114 (defun !bootstrap-meta-braid ()
115   (let* ((*create-classes-from-internal-structure-definitions-p* nil)
116          standard-class-wrapper standard-class
117          funcallable-standard-class-wrapper funcallable-standard-class
118          slot-class-wrapper slot-class
119          built-in-class-wrapper built-in-class
120          structure-class-wrapper structure-class
121          condition-class-wrapper condition-class
122          standard-direct-slot-definition-wrapper
123          standard-direct-slot-definition
124          standard-effective-slot-definition-wrapper
125          standard-effective-slot-definition
126          class-eq-specializer-wrapper class-eq-specializer
127          standard-generic-function-wrapper standard-generic-function)
128     (!initial-classes-and-wrappers
129      standard-class funcallable-standard-class
130      slot-class built-in-class structure-class condition-class
131      standard-direct-slot-definition standard-effective-slot-definition
132      class-eq-specializer standard-generic-function)
133     ;; First, make a class metaobject for each of the early classes. For
134     ;; each metaobject we also set its wrapper. Except for the class T,
135     ;; the wrapper is always that of STANDARD-CLASS.
136     (dolist (definition *early-class-definitions*)
137       (let* ((name (ecd-class-name definition))
138              (meta (ecd-metaclass definition))
139              (wrapper (ecase meta
140                         (slot-class slot-class-wrapper)
141                         (standard-class standard-class-wrapper)
142                         (funcallable-standard-class
143                          funcallable-standard-class-wrapper)
144                         (built-in-class built-in-class-wrapper)
145                         (structure-class structure-class-wrapper)
146                         (condition-class condition-class-wrapper)))
147              (class (or (find-class name nil)
148                         (allocate-standard-instance wrapper))))
149         (setf (find-class name) class)))
150     (dolist (definition *early-class-definitions*)
151       (let ((name (ecd-class-name definition))
152             (meta (ecd-metaclass definition))
153             (source (ecd-source-location definition))
154             (direct-supers (ecd-superclass-names definition))
155             (direct-slots  (ecd-canonical-slots definition))
156             (other-initargs (ecd-other-initargs definition)))
157         (let ((direct-default-initargs
158                (getf other-initargs :direct-default-initargs)))
159           (multiple-value-bind (slots cpl default-initargs direct-subclasses)
160               (early-collect-inheritance name)
161             (let* ((class (find-class name))
162                    (wrapper (cond ((eq class slot-class)
163                                    slot-class-wrapper)
164                                   ((eq class standard-class)
165                                    standard-class-wrapper)
166                                   ((eq class funcallable-standard-class)
167                                    funcallable-standard-class-wrapper)
168                                   ((eq class standard-direct-slot-definition)
169                                    standard-direct-slot-definition-wrapper)
170                                   ((eq class
171                                        standard-effective-slot-definition)
172                                    standard-effective-slot-definition-wrapper)
173                                   ((eq class built-in-class)
174                                    built-in-class-wrapper)
175                                   ((eq class structure-class)
176                                    structure-class-wrapper)
177                                   ((eq class condition-class)
178                                    condition-class-wrapper)
179                                   ((eq class class-eq-specializer)
180                                    class-eq-specializer-wrapper)
181                                   ((eq class standard-generic-function)
182                                    standard-generic-function-wrapper)
183                                   (t
184                                    (boot-make-wrapper (length slots) name))))
185                    (proto nil))
186               (when (eq name t) (setq *the-wrapper-of-t* wrapper))
187               (set (make-class-symbol name) class)
188               (dolist (slot slots)
189                 (unless (eq (getf slot :allocation :instance) :instance)
190                   (error "Slot allocation ~S is not supported in bootstrap."
191                          (getf slot :allocation))))
192
193               (when (typep wrapper 'wrapper)
194                 (setf (wrapper-instance-slots-layout wrapper)
195                       (mapcar #'canonical-slot-name slots))
196                 (setf (wrapper-class-slots wrapper)
197                       ()))
198
199               (setq proto (if (eq meta 'funcallable-standard-class)
200                               (allocate-funcallable-instance wrapper)
201                               (allocate-standard-instance wrapper)))
202
203               (setq direct-slots
204                     (!bootstrap-make-slot-definitions
205                      name class direct-slots
206                      standard-direct-slot-definition-wrapper nil))
207               (setq slots
208                     (!bootstrap-make-slot-definitions
209                      name class slots
210                      standard-effective-slot-definition-wrapper t))
211
212               (case meta
213                 ((standard-class funcallable-standard-class)
214                  (!bootstrap-initialize-class
215                   meta
216                   class name class-eq-specializer-wrapper source
217                   direct-supers direct-subclasses cpl wrapper proto
218                   direct-slots slots direct-default-initargs default-initargs))
219                 (built-in-class         ; *the-class-t*
220                  (!bootstrap-initialize-class
221                   meta
222                   class name class-eq-specializer-wrapper source
223                   direct-supers direct-subclasses cpl wrapper proto))
224                 (slot-class             ; *the-class-slot-object*
225                  (!bootstrap-initialize-class
226                   meta
227                   class name class-eq-specializer-wrapper source
228                   direct-supers direct-subclasses cpl wrapper proto))
229                 (structure-class        ; *the-class-structure-object*
230                  (!bootstrap-initialize-class
231                   meta
232                   class name class-eq-specializer-wrapper source
233                   direct-supers direct-subclasses cpl wrapper))
234                 (condition-class
235                  (!bootstrap-initialize-class
236                   meta
237                   class name class-eq-specializer-wrapper source
238                   direct-supers direct-subclasses cpl wrapper))))))))
239
240     (let* ((smc-class (find-class 'standard-method-combination))
241            (smc-wrapper (!bootstrap-get-slot 'standard-class
242                                              smc-class
243                                              'wrapper))
244            (smc (allocate-standard-instance smc-wrapper)))
245       (flet ((set-slot (name value)
246                (!bootstrap-set-slot 'standard-method-combination
247                                     smc
248                                     name
249                                     value)))
250         (set-slot 'source nil)
251         (set-slot 'type-name 'standard)
252         (set-slot '%documentation "The standard method combination.")
253         (set-slot 'options ()))
254       (setq *standard-method-combination* smc))))
255
256 ;;; Initialize a class metaobject.
257 (defun !bootstrap-initialize-class
258        (metaclass-name class name
259         class-eq-wrapper source direct-supers direct-subclasses cpl wrapper
260         &optional
261         (proto nil proto-p)
262         direct-slots slots direct-default-initargs default-initargs)
263   (flet ((classes (names) (mapcar #'find-class names))
264          (set-slot (slot-name value)
265            (!bootstrap-set-slot metaclass-name class slot-name value)))
266     (set-slot 'name name)
267     (set-slot 'finalized-p t)
268     (set-slot 'source source)
269     (set-slot '%type (if (eq class (find-class t))
270                          t
271                          ;; FIXME: Could this just be CLASS instead
272                          ;; of `(CLASS ,CLASS)? If not, why not?
273                          ;; (See also similar expression in
274                          ;; SHARED-INITIALIZE :BEFORE (CLASS).)
275                          `(class ,class)))
276     (set-slot 'class-eq-specializer
277               (let ((spec (allocate-standard-instance class-eq-wrapper)))
278                 (!bootstrap-set-slot 'class-eq-specializer spec '%type
279                                      `(class-eq ,class))
280                 (!bootstrap-set-slot 'class-eq-specializer spec 'object
281                                      class)
282                 spec))
283     (set-slot '%class-precedence-list (classes cpl))
284     (set-slot 'cpl-available-p t)
285     (set-slot 'can-precede-list (classes (cdr cpl)))
286     (set-slot 'incompatible-superclass-list nil)
287     (set-slot 'direct-superclasses (classes direct-supers))
288     (set-slot 'direct-subclasses (classes direct-subclasses))
289     (set-slot 'direct-methods (cons nil nil))
290     (set-slot 'wrapper wrapper)
291     (set-slot '%documentation nil)
292     (set-slot 'plist
293               `(,@(and direct-default-initargs
294                        `(direct-default-initargs ,direct-default-initargs))
295                 ,@(and default-initargs
296                        `(default-initargs ,default-initargs))))
297     (when (memq metaclass-name '(standard-class funcallable-standard-class
298                                  structure-class condition-class
299                                  slot-class))
300       (set-slot 'direct-slots direct-slots)
301       (set-slot 'slots slots))
302
303     ;; For all direct superclasses SUPER of CLASS, make sure CLASS is
304     ;; a direct subclass of SUPER.  Note that METACLASS-NAME doesn't
305     ;; matter here for the slot DIRECT-SUBCLASSES, since every class
306     ;; inherits the slot from class CLASS.
307     (dolist (super direct-supers)
308       (let* ((super (find-class super))
309              (subclasses (!bootstrap-get-slot metaclass-name super
310                                               'direct-subclasses)))
311         (cond ((eq +slot-unbound+ subclasses)
312                (!bootstrap-set-slot metaclass-name super 'direct-subclasses
313                                     (list class)))
314               ((not (memq class subclasses))
315                (!bootstrap-set-slot metaclass-name super 'direct-subclasses
316                                     (cons class subclasses))))))
317
318     (case metaclass-name
319       (structure-class
320        (let ((constructor-sym '|STRUCTURE-OBJECT class constructor|))
321          (set-slot 'defstruct-form
322                    `(defstruct (structure-object (:constructor
323                                                   ,constructor-sym)
324                                                  (:copier nil))))
325          (set-slot 'defstruct-constructor constructor-sym)
326          (set-slot 'from-defclass-p t)
327          (set-slot 'plist nil)
328          (set-slot 'prototype (funcall constructor-sym))))
329       (condition-class
330        (set-slot 'prototype (make-condition name)))
331       (t
332        (set-slot 'prototype
333                  (if proto-p proto (allocate-standard-instance wrapper)))))
334     class))
335
336 (defun !bootstrap-make-slot-definitions (name class slots wrapper effective-p)
337   (let ((index -1))
338     (mapcar (lambda (slot)
339               (incf index)
340               (!bootstrap-make-slot-definition
341                name class slot wrapper effective-p index))
342             slots)))
343
344 (defun !bootstrap-make-slot-definition
345     (name class slot wrapper effective-p index)
346   (let* ((slotd-class-name (if effective-p
347                                'standard-effective-slot-definition
348                                'standard-direct-slot-definition))
349          (slotd (allocate-standard-instance wrapper))
350          (slot-name (getf slot :name)))
351     (flet ((get-val (name) (getf slot name))
352            (set-val (name val)
353                     (!bootstrap-set-slot slotd-class-name slotd name val)))
354       (set-val 'name         slot-name)
355       (set-val 'initform     (get-val :initform))
356       (set-val 'initfunction (get-val :initfunction))
357       (set-val 'initargs     (get-val :initargs))
358       (set-val 'readers      (get-val :readers))
359       (set-val 'writers      (get-val :writers))
360       (set-val 'allocation   :instance)
361       (set-val '%type        (or (get-val :type) t))
362       (set-val '%documentation (or (get-val :documentation) ""))
363       (set-val '%class   class)
364       (when effective-p
365         (set-val 'location index)
366         (let ((fsc-p nil))
367           (set-val 'reader-function (make-optimized-std-reader-method-function
368                                      fsc-p nil slot-name index))
369           (set-val 'writer-function (make-optimized-std-writer-method-function
370                                      fsc-p nil slot-name index))
371           (set-val 'boundp-function (make-optimized-std-boundp-method-function
372                                      fsc-p nil slot-name index)))
373         (set-val 'accessor-flags 7))
374       (when (and (eq name 'standard-class)
375                  (eq slot-name 'slots) effective-p)
376         (setq *the-eslotd-standard-class-slots* slotd))
377       (when (and (eq name 'funcallable-standard-class)
378                  (eq slot-name 'slots) effective-p)
379         (setq *the-eslotd-funcallable-standard-class-slots* slotd))
380       slotd)))
381
382 (defun !bootstrap-accessor-definitions (early-p)
383   (let ((*early-p* early-p))
384     (dolist (definition *early-class-definitions*)
385       (let ((name (ecd-class-name definition))
386             (meta (ecd-metaclass definition)))
387         (unless (eq meta 'built-in-class)
388           (let ((direct-slots  (ecd-canonical-slots definition)))
389             (dolist (slotd direct-slots)
390               (let ((slot-name (getf slotd :name))
391                     (readers (getf slotd :readers))
392                     (writers (getf slotd :writers)))
393                 (!bootstrap-accessor-definitions1
394                  name
395                  slot-name
396                  readers
397                  writers
398                  nil)))))))))
399
400 (defun !bootstrap-accessor-definition (class-name accessor-name slot-name type)
401   (multiple-value-bind (accessor-class make-method-function arglist specls doc)
402       (ecase type
403         (reader (values 'standard-reader-method
404                         #'make-std-reader-method-function
405                         (list class-name)
406                         (list class-name)
407                         "automatically generated reader method"))
408         (writer (values 'standard-writer-method
409                         #'make-std-writer-method-function
410                         (list 'new-value class-name)
411                         (list t class-name)
412                         "automatically generated writer method"))
413         (boundp (values 'standard-boundp-method
414                         #'make-std-boundp-method-function
415                         (list class-name)
416                         (list class-name)
417                         "automatically generated boundp method")))
418     (let ((gf (ensure-generic-function accessor-name
419                                        :lambda-list arglist)))
420       (if (find specls (early-gf-methods gf)
421                 :key #'early-method-specializers
422                 :test 'equal)
423           (unless (assoc accessor-name *!generic-function-fixups*
424                          :test #'equal)
425             (update-dfun gf))
426           (add-method gf
427                       (make-a-method accessor-class
428                                      ()
429                                      arglist specls
430                                      (funcall make-method-function
431                                               class-name slot-name)
432                                      doc
433                                      :slot-name slot-name
434                                      :object-class class-name
435                                      :method-class-function (constantly (find-class accessor-class))))))))
436
437 (defun !bootstrap-accessor-definitions1 (class-name
438                                         slot-name
439                                         readers
440                                         writers
441                                         boundps)
442   (flet ((do-reader-definition (reader)
443            (!bootstrap-accessor-definition class-name
444                                            reader
445                                            slot-name
446                                            'reader))
447          (do-writer-definition (writer)
448            (!bootstrap-accessor-definition class-name
449                                            writer
450                                            slot-name
451                                            'writer))
452          (do-boundp-definition (boundp)
453            (!bootstrap-accessor-definition class-name
454                                            boundp
455                                            slot-name
456                                            'boundp)))
457     (dolist (reader readers) (do-reader-definition reader))
458     (dolist (writer writers) (do-writer-definition writer))
459     (dolist (boundp boundps) (do-boundp-definition boundp))))
460
461 ;;; FIXME: find a better name.
462 (defun !bootstrap-class-predicates (early-p)
463   (let ((*early-p* early-p))
464     (dolist (ecp *early-class-predicates*)
465       (let ((class-name (car ecp))
466             (predicate-name (cadr ecp)))
467         (make-class-predicate (find-class class-name) predicate-name)))))
468
469 (defun !bootstrap-built-in-classes ()
470
471   ;; First make sure that all the supers listed in
472   ;; *BUILT-IN-CLASS-LATTICE* are themselves defined by
473   ;; *BUILT-IN-CLASS-LATTICE*. This is just to check for typos and
474   ;; other sorts of brainos.
475   (dolist (e *built-in-classes*)
476     (dolist (super (cadr e))
477       (unless (or (eq super t)
478                   (assq super *built-in-classes*))
479         (error "in *BUILT-IN-CLASSES*: ~S has ~S as a super,~%~
480                 but ~S is not itself a class in *BUILT-IN-CLASSES*."
481                (car e) super super))))
482
483   ;; In the first pass, we create a skeletal object to be bound to the
484   ;; class name.
485   (let* ((built-in-class (find-class 'built-in-class))
486          (built-in-class-wrapper (class-wrapper built-in-class)))
487     (dolist (e *built-in-classes*)
488       (let ((class (allocate-standard-instance built-in-class-wrapper)))
489         (setf (find-class (car e)) class))))
490
491   ;; In the second pass, we initialize the class objects.
492   (let ((class-eq-wrapper (class-wrapper (find-class 'class-eq-specializer))))
493     (dolist (e *built-in-classes*)
494       (destructuring-bind (name supers subs cpl prototype) e
495         (let* ((class (find-class name))
496                (lclass (find-classoid name))
497                (wrapper (classoid-layout lclass)))
498           (set (get-built-in-class-symbol name) class)
499           (set (get-built-in-wrapper-symbol name) wrapper)
500           (setf (classoid-pcl-class lclass) class)
501
502           (!bootstrap-initialize-class 'built-in-class class
503                                        name class-eq-wrapper nil
504                                        supers subs
505                                        (cons name cpl)
506                                        wrapper prototype))))))
507 \f
508 (defmacro wrapper-of-macro (x)
509   `(layout-of ,x))
510
511 (defun class-of (x)
512   (wrapper-class* (wrapper-of-macro x)))
513
514 ;;; FIXME: We probably don't need both WRAPPER-OF and WRAPPER-OF-MACRO.
515 #-sb-fluid (declaim (inline wrapper-of))
516 (defun wrapper-of (x)
517   (wrapper-of-macro x))
518
519 (defun eval-form (form)
520   (lambda () (eval form)))
521
522 (defun ensure-non-standard-class (name &optional existing-class)
523   (flet
524       ((ensure (metaclass &optional (slots nil slotsp))
525          (let ((supers
526                 (mapcar #'classoid-name (classoid-direct-superclasses
527                                          (find-classoid name)))))
528            (if slotsp
529                (ensure-class-using-class existing-class name
530                                          :metaclass metaclass :name name
531                                          :direct-superclasses supers
532                                          :direct-slots slots)
533                (ensure-class-using-class existing-class name
534                                          :metaclass metaclass :name name
535                                          :direct-superclasses supers))))
536        (slot-initargs-from-structure-slotd (slotd)
537          (let ((accessor (structure-slotd-accessor-symbol slotd)))
538            `(:name ,(structure-slotd-name slotd)
539              :defstruct-accessor-symbol ,accessor
540              ,@(when (fboundp accessor)
541                  `(:internal-reader-function
542                    ,(structure-slotd-reader-function slotd)
543                    :internal-writer-function
544                    ,(structure-slotd-writer-function name slotd)))
545              :type ,(or (structure-slotd-type slotd) t)
546              :initform ,(structure-slotd-init-form slotd)
547              :initfunction ,(eval-form (structure-slotd-init-form slotd)))))
548        (slot-initargs-from-condition-slot (slot)
549          `(:name ,(condition-slot-name slot)
550            :initargs ,(condition-slot-initargs slot)
551            :readers ,(condition-slot-readers slot)
552            :writers ,(condition-slot-writers slot)
553            ,@(when (condition-slot-initform-p slot)
554                (let ((form-or-fun (condition-slot-initform slot)))
555                  (if (functionp form-or-fun)
556                      `(:initfunction ,form-or-fun)
557                      `(:initform ,form-or-fun
558                        :initfunction ,(lambda () form-or-fun)))))
559            :allocation ,(condition-slot-allocation slot)
560            :documentation ,(condition-slot-documentation slot))))
561     (cond ((structure-type-p name)
562            (ensure 'structure-class
563                    (mapcar #'slot-initargs-from-structure-slotd
564                            (structure-type-slot-description-list name))))
565           ((condition-type-p name)
566            (ensure 'condition-class
567                    (mapcar #'slot-initargs-from-condition-slot
568                            (condition-classoid-slots (find-classoid name)))))
569           (t
570            (error "~@<~S is not the name of a class.~@:>" name)))))
571
572 (defun ensure-deffoo-class (classoid)
573   (let ((class (classoid-pcl-class classoid)))
574     (cond (class
575            (ensure-non-standard-class (class-name class) class))
576           ((eq 'complete *boot-state*)
577            (ensure-non-standard-class (classoid-name classoid))))))
578
579 (pushnew 'ensure-deffoo-class sb-kernel::*defstruct-hooks*)
580 (pushnew 'ensure-deffoo-class sb-kernel::*define-condition-hooks*)
581 \f
582 (defun make-class-predicate (class name)
583   (let* ((gf (ensure-generic-function name :lambda-list '(object)))
584          (mlist (if (eq *boot-state* 'complete)
585                     (generic-function-methods gf)
586                     (early-gf-methods gf))))
587     (unless mlist
588       (unless (eq class *the-class-t*)
589         (let* ((default-method-function #'constantly-nil)
590                (default-method-initargs (list :function
591                                               default-method-function))
592                (default-method (make-a-method
593                                 'standard-method
594                                 ()
595                                 (list 'object)
596                                 (list *the-class-t*)
597                                 default-method-initargs
598                                 "class predicate default method")))
599           (setf (method-function-get default-method-function :constant-value)
600                 nil)
601           (add-method gf default-method)))
602       (let* ((class-method-function #'constantly-t)
603              (class-method-initargs (list :function
604                                           class-method-function))
605              (class-method (make-a-method 'standard-method
606                                           ()
607                                           (list 'object)
608                                           (list class)
609                                           class-method-initargs
610                                           "class predicate class method")))
611         (setf (method-function-get class-method-function :constant-value) t)
612         (add-method gf class-method)))
613     gf))
614
615 ;;; Set the inherits from CPL, and register the layout. This actually
616 ;;; installs the class in the Lisp type system.
617 (defun update-lisp-class-layout (class layout)
618   (let ((classoid (layout-classoid layout))
619         (olayout (class-wrapper class)))
620     (unless (eq (classoid-layout classoid) layout)
621       (setf (layout-inherits layout)
622             (order-layout-inherits
623              (map 'simple-vector #'class-wrapper
624                   (reverse (rest (class-precedence-list class))))))
625       (register-layout layout :invalidate t)
626
627       ;; FIXME: I don't think this should be necessary, but without it
628       ;; we are unable to compile (TYPEP foo '<class-name>) in the
629       ;; same file as the class is defined.  If we had environments,
630       ;; then I think the classsoid whould only be associated with the
631       ;; name in that environment...  Alternatively, fix the compiler
632       ;; so that TYPEP foo '<class-name> is slow but compileable.
633       (let ((name (class-name class)))
634         (when (and name (symbolp name) (eq name (classoid-name classoid)))
635           (setf (find-classoid name) classoid))))))
636
637 (defun set-class-type-translation (class classoid)
638   (when (not (typep classoid 'classoid))
639     (setq classoid (find-classoid classoid nil)))
640   (etypecase classoid
641     (null)
642     (built-in-classoid
643      (let ((translation (built-in-classoid-translation classoid)))
644        (cond
645          (translation
646           (aver (ctype-p translation))
647           (setf (info :type :translator class)
648                 (lambda (spec) (declare (ignore spec)) translation)))
649          (t
650           (setf (info :type :translator class)
651                 (lambda (spec) (declare (ignore spec)) classoid))))))
652     (classoid
653      (setf (info :type :translator class)
654            (lambda (spec) (declare (ignore spec)) classoid)))))
655
656 (clrhash *find-class*)
657 (!bootstrap-meta-braid)
658 (!bootstrap-accessor-definitions t)
659 (!bootstrap-class-predicates t)
660 (!bootstrap-accessor-definitions nil)
661 (!bootstrap-class-predicates nil)
662 (!bootstrap-built-in-classes)
663
664 (dohash (name x *find-class*)
665         (let* ((class (find-class-from-cell name x))
666                (layout (class-wrapper class))
667                (lclass (layout-classoid layout))
668                (lclass-pcl-class (classoid-pcl-class lclass))
669                (olclass (find-classoid name nil)))
670           (if lclass-pcl-class
671               (aver (eq class lclass-pcl-class))
672               (setf (classoid-pcl-class lclass) class))
673
674           (update-lisp-class-layout class layout)
675
676           (cond (olclass
677                  (aver (eq lclass olclass)))
678                 (t
679                  (setf (find-classoid name) lclass)))
680
681           (set-class-type-translation class name)))
682
683 (setq *boot-state* 'braid)
684
685 (defmethod no-applicable-method (generic-function &rest args)
686   (error "~@<There is no applicable method for the generic function ~2I~_~S~
687           ~I~_when called with arguments ~2I~_~S.~:>"
688          generic-function
689          args))
690
691 (defmethod no-next-method ((generic-function standard-generic-function)
692                            (method standard-method) &rest args)
693   (error "~@<There is no next method for the generic function ~2I~_~S~
694           ~I~_when called from method ~2I~_~S~I~_with arguments ~2I~_~S.~:>"
695          generic-function
696          method
697          args))
698
699 ;;; An extension to the ANSI standard: in the presence of e.g. a
700 ;;; :BEFORE method, it would seem that going through
701 ;;; NO-APPLICABLE-METHOD is prohibited, as in fact there is an
702 ;;; applicable method.  -- CSR, 2002-11-15
703 (defmethod no-primary-method (generic-function &rest args)
704   (error "~@<There is no primary method for the generic function ~2I~_~S~
705           ~I~_when called with arguments ~2I~_~S.~:>"
706          generic-function
707          args))
708
709 (defmethod invalid-qualifiers ((gf generic-function)
710                                combin
711                                method)
712   (let ((qualifiers (method-qualifiers method)))
713     (let ((why (cond
714                  ((cdr qualifiers) "has too many qualifiers")
715                  (t (aver (not (member (car qualifiers)
716                                        '(:around :before :after))))
717                     "has an invalid qualifier"))))
718       (invalid-method-error
719        method
720        "The method ~S on ~S ~A.~%~
721         Standard method combination requires all methods to have one~%~
722         of the single qualifiers :AROUND, :BEFORE and :AFTER or to~%~
723         have no qualifier at all."
724        method gf why))))