1 ;;;; This file contains structures and functions for the maintenance of
2 ;;;; basic information about defined types. Different object systems
3 ;;;; can be supported simultaneously. Some of the functions here are
4 ;;;; nominally generic, and are overwritten when CLOS is loaded.
6 ;;;; This software is part of the SBCL system. See the README file for
9 ;;;; This software is derived from the CMU CL system, which was
10 ;;;; written at Carnegie Mellon University and released into the
11 ;;;; public domain. The software is in the public domain and is
12 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
13 ;;;; files for more information.
15 (in-package "SB!KERNEL")
17 (!begin-collecting-cold-init-forms)
19 ;;;; the CLASS structure
21 ;;; The CLASS structure is a supertype of all class types. A CLASS is
22 ;;; also a CTYPE structure as recognized by the type system.
24 (:make-load-form-fun classoid-make-load-form-fun)
26 (class-info (type-class-or-lose 'classoid)))
28 #-no-ansi-print-object
30 (lambda (class stream)
31 (let ((name (classoid-name class)))
32 (print-unreadable-object (class stream
36 ;; FIXME: Make sure that this prints
37 ;; reasonably for anonymous classes.
38 "~:[anonymous~;~:*~S~]~@[ (~(~A~))~]"
40 (classoid-state class))))))
41 #-sb-xc-host (:pure nil))
42 ;; the value to be returned by CLASSOID-NAME.
43 (name nil :type symbol)
44 ;; the current layout for this class, or NIL if none assigned yet
45 (layout nil :type (or layout null))
46 ;; How sure are we that this class won't be redefined?
47 ;; :READ-ONLY = We are committed to not changing the effective
48 ;; slots or superclasses.
49 ;; :SEALED = We can't even add subclasses.
50 ;; NIL = Anything could happen.
51 (state nil :type (member nil :read-only :sealed))
52 ;; direct superclasses of this class
53 (direct-superclasses () :type list)
54 ;; representation of all of the subclasses (direct or indirect) of
55 ;; this class. This is NIL if no subclasses or not initalized yet;
56 ;; otherwise, it's an EQ hash-table mapping CL:CLASS objects to the
57 ;; subclass layout that was in effect at the time the subclass was
59 (subclasses nil :type (or null hash-table))
60 ;; the PCL class object for this class, or NIL if none assigned yet
63 (defun classoid-make-load-form-fun (class)
64 (/show "entering %CLASSOID-MAKE-LOAD-FORM-FUN" class)
65 (let ((name (classoid-name class)))
66 (unless (and name (eq (find-classoid name nil) class))
67 (/show "anonymous/undefined class case")
68 (error "can't use anonymous or undefined class as constant:~% ~S"
71 ;; KLUDGE: There's a FIND-CLASS DEFTRANSFORM for constant class
72 ;; names which creates fast but non-cold-loadable, non-compact
73 ;; code. In this context, we'd rather have compact,
74 ;; cold-loadable code. -- WHN 19990928
75 (declare (notinline find-classoid))
76 (find-classoid ',name))))
78 ;;;; basic LAYOUT stuff
80 ;;; Note: This bound is set somewhat less than MOST-POSITIVE-FIXNUM
81 ;;; in order to guarantee that several hash values can be added without
82 ;;; overflowing into a bignum.
83 (def!constant layout-clos-hash-max (ash most-positive-fixnum -3)
85 "the inclusive upper bound on LAYOUT-CLOS-HASH values")
87 ;;; a list of conses, initialized by genesis
89 ;;; In each cons, the car is the symbol naming the layout, and the
90 ;;; cdr is the layout itself.
91 (defvar *!initial-layouts*)
93 ;;; a table mapping class names to layouts for classes we have
94 ;;; referenced but not yet loaded. This is initialized from an alist
95 ;;; created by genesis describing the layouts that genesis created at
97 (defvar *forward-referenced-layouts*)
99 (setq *forward-referenced-layouts* (make-hash-table :test 'equal))
101 (/show0 "processing *!INITIAL-LAYOUTS*")
102 (dolist (x *!initial-layouts*)
103 (setf (gethash (car x) *forward-referenced-layouts*)
105 (/show0 "done processing *!INITIAL-LAYOUTS*")))
107 ;;; The LAYOUT structure is pointed to by the first cell of instance
108 ;;; (or structure) objects. It represents what we need to know for
109 ;;; type checking and garbage collection. Whenever a class is
110 ;;; incompatibly redefined, a new layout is allocated. If two object's
111 ;;; layouts are EQ, then they are exactly the same type.
113 ;;; KLUDGE: The genesis code has raw offsets of slots in this
114 ;;; structure hardwired into it. It would be good to rewrite that code
115 ;;; so that it looks up those offsets in the compiler's tables, but
116 ;;; for now if you change this structure, lucky you, you get to grovel
117 ;;; over the genesis code by hand.:-( -- WHN 19990820
119 ;; KLUDGE: A special hack keeps this from being
120 ;; called when building code for the
121 ;; cross-compiler. See comments at the DEFUN for
122 ;; this. -- WHN 19990914
123 (:make-load-form-fun #-sb-xc-host ignore-it
124 ;; KLUDGE: DEF!STRUCT at #+SB-XC-HOST
125 ;; time controls both the
126 ;; build-the-cross-compiler behavior
127 ;; and the run-the-cross-compiler
128 ;; behavior. The value below only
129 ;; works for build-the-cross-compiler.
130 ;; There's a special hack in
131 ;; EMIT-MAKE-LOAD-FORM which gives
132 ;; effectively IGNORE-IT behavior for
133 ;; LAYOUT at run-the-cross-compiler
134 ;; time. It would be cleaner to
135 ;; actually have an IGNORE-IT value
136 ;; stored, but it's hard to see how to
137 ;; do that concisely with the current
138 ;; DEF!STRUCT setup. -- WHN 19990930
140 make-load-form-for-layout))
141 ;; hash bits which should be set to constant pseudo-random values
142 ;; for use by CLOS. Sleazily accessed via %INSTANCE-REF, see
145 ;; FIXME: We should get our story straight on what the type of these
146 ;; values is. (declared INDEX here, described as <=
147 ;; LAYOUT-CLOS-HASH-MAX by the doc string of that constant,
148 ;; generated as strictly positive in RANDOM-LAYOUT-CLOS-HASH..)
150 ;; KLUDGE: The fact that the slots here start at offset 1 is known
151 ;; to the LAYOUT-CLOS-HASH function and to the LAYOUT-dumping code
153 (clos-hash-0 (random-layout-clos-hash) :type index)
154 (clos-hash-1 (random-layout-clos-hash) :type index)
155 (clos-hash-2 (random-layout-clos-hash) :type index)
156 (clos-hash-3 (random-layout-clos-hash) :type index)
157 (clos-hash-4 (random-layout-clos-hash) :type index)
158 (clos-hash-5 (random-layout-clos-hash) :type index)
159 (clos-hash-6 (random-layout-clos-hash) :type index)
160 (clos-hash-7 (random-layout-clos-hash) :type index)
161 ;; the class that this is a layout for
162 (classoid (missing-arg) :type classoid)
163 ;; The value of this slot can be:
164 ;; * :UNINITIALIZED if not initialized yet;
165 ;; * NIL if this is the up-to-date layout for a class; or
166 ;; * T if this layout has been invalidated (by being replaced by
167 ;; a new, more-up-to-date LAYOUT).
168 ;; * something else (probably a list) if the class is a PCL wrapper
169 ;; and PCL has made it invalid and made a note to itself about it
170 (invalid :uninitialized :type (or cons (member nil t :uninitialized)))
171 ;; the layouts for all classes we inherit. If hierarchical, i.e. if
172 ;; DEPTHOID >= 0, then these are ordered by ORDER-LAYOUT-INHERITS,
173 ;; so that each inherited layout appears at its expected depth,
174 ;; i.e. at its LAYOUT-DEPTHOID value.
176 ;; Remaining elements are filled by the non-hierarchical layouts or,
177 ;; if they would otherwise be empty, by copies of succeeding layouts.
178 (inherits #() :type simple-vector)
179 ;; If inheritance is not hierarchical, this is -1. If inheritance is
180 ;; hierarchical, this is the inheritance depth, i.e. (LENGTH INHERITS).
182 ;; (1) This turns out to be a handy encoding for arithmetically
183 ;; comparing deepness; it is generally useful to do a bare numeric
184 ;; comparison of these depthoid values, and we hardly ever need to
185 ;; test whether the values are negative or not.
186 ;; (2) This was called INHERITANCE-DEPTH in classic CMU CL. It was
187 ;; renamed because some of us find it confusing to call something
188 ;; a depth when it isn't quite.
189 (depthoid -1 :type layout-depthoid)
190 ;; the number of top level descriptor cells in each instance
191 (length 0 :type index)
192 ;; If this layout has some kind of compiler meta-info, then this is
193 ;; it. If a structure, then we store the DEFSTRUCT-DESCRIPTION here.
195 ;; This is true if objects of this class are never modified to
196 ;; contain dynamic pointers in their slots or constant-like
197 ;; substructure (and hence can be copied into read-only space by
200 ;; KLUDGE: This slot is known to the C runtime support code.
201 (pure nil :type (member t nil 0)))
203 (def!method print-object ((layout layout) stream)
204 (print-unreadable-object (layout stream :type t :identity t)
206 "for ~S~@[, INVALID=~S~]"
207 (layout-proper-name layout)
208 (layout-invalid layout))))
210 (eval-when (:compile-toplevel :load-toplevel :execute)
211 (defun layout-proper-name (layout)
212 (classoid-proper-name (layout-classoid layout))))
214 ;;;; support for the hash values used by CLOS when working with LAYOUTs
216 (def!constant layout-clos-hash-length 8)
217 #!-sb-fluid (declaim (inline layout-clos-hash))
218 (defun layout-clos-hash (layout i)
219 ;; FIXME: Either this I should be declared to be `(MOD
220 ;; ,LAYOUT-CLOS-HASH-LENGTH), or this is used in some inner loop
221 ;; where we can't afford to check that kind of thing and therefore
222 ;; should have some insane level of optimization. (This is true both
223 ;; of this function and of the SETF function below.)
224 (declare (type layout layout) (type index i))
225 ;; FIXME: LAYOUT slots should have type `(MOD ,LAYOUT-CLOS-HASH-MAX),
227 (truly-the index (%instance-ref layout (1+ i))))
228 #!-sb-fluid (declaim (inline (setf layout-clos-hash)))
229 (defun (setf layout-clos-hash) (new-value layout i)
230 (declare (type layout layout) (type index new-value i))
231 (setf (%instance-ref layout (1+ i)) new-value))
233 ;;; a generator for random values suitable for the CLOS-HASH slots of
234 ;;; LAYOUTs. We use our own RANDOM-STATE here because we'd like
235 ;;; pseudo-random values to come the same way in the target even when
236 ;;; we make minor changes to the system, in order to reduce the
237 ;;; mysteriousness of possible CLOS bugs.
238 (defvar *layout-clos-hash-random-state*)
239 (defun random-layout-clos-hash ()
240 ;; FIXME: I'm not sure why this expression is (1+ (RANDOM FOO)),
241 ;; returning a strictly positive value. I copied it verbatim from
242 ;; CMU CL INITIALIZE-LAYOUT-HASH, so presumably it works, but I
243 ;; dunno whether the hash values are really supposed to be 1-based.
244 ;; They're declared as INDEX.. Or is this a hack to try to avoid
245 ;; having to use bignum arithmetic? Or what? An explanation would be
247 (1+ (random layout-clos-hash-max
248 (if (boundp '*layout-clos-hash-random-state*)
249 *layout-clos-hash-random-state*
250 (setf *layout-clos-hash-random-state*
251 (make-random-state))))))
253 ;;; If we can't find any existing layout, then we create a new one
254 ;;; storing it in *FORWARD-REFERENCED-LAYOUTS*. In classic CMU CL, we
255 ;;; used to immediately check for compatibility, but for
256 ;;; cross-compilability reasons (i.e. convenience of using this
257 ;;; function in a MAKE-LOAD-FORM expression) that functionality has
258 ;;; been split off into INIT-OR-CHECK-LAYOUT.
259 (declaim (ftype (function (symbol) layout) find-layout))
260 (defun find-layout (name)
261 (let ((classoid (find-classoid name nil)))
262 (or (and classoid (classoid-layout classoid))
263 (gethash name *forward-referenced-layouts*)
264 (setf (gethash name *forward-referenced-layouts*)
265 (make-layout :classoid (or classoid
266 (make-undefined-classoid name)))))))
268 ;;; If LAYOUT is uninitialized, initialize it with CLASS, LENGTH,
269 ;;; INHERITS, and DEPTHOID, otherwise require that it be consistent
270 ;;; with CLASS, LENGTH, INHERITS, and DEPTHOID.
272 ;;; UNDEFINED-CLASS values are interpreted specially as "we don't know
273 ;;; anything about the class", so if LAYOUT is initialized, any
274 ;;; preexisting class slot value is OK, and if it's not initialized,
275 ;;; its class slot value is set to an UNDEFINED-CLASS. -- FIXME: This
276 ;;; is no longer true, :UNINITIALIZED used instead.
277 (declaim (ftype (function (layout classoid index simple-vector layout-depthoid)
279 init-or-check-layout))
280 (defun init-or-check-layout (layout classoid length inherits depthoid)
281 (cond ((eq (layout-invalid layout) :uninitialized)
282 ;; There was no layout before, we just created one which
283 ;; we'll now initialize with our information.
284 (setf (layout-length layout) length
285 (layout-inherits layout) inherits
286 (layout-depthoid layout) depthoid
287 (layout-classoid layout) classoid
288 (layout-invalid layout) nil))
289 ;; FIXME: Now that LAYOUTs are born :UNINITIALIZED, maybe this
290 ;; clause is not needed?
291 ((not *type-system-initialized*)
292 (setf (layout-classoid layout) classoid))
294 ;; There was an old layout already initialized with old
295 ;; information, and we'll now check that old information
296 ;; which was known with certainty is consistent with current
297 ;; information which is known with certainty.
298 (check-layout layout classoid length inherits depthoid)))
301 ;;; In code for the target Lisp, we don't use dump LAYOUTs using the
302 ;;; standard load form mechanism, we use special fops instead, in
303 ;;; order to make cold load come out right. But when we're building
304 ;;; the cross-compiler, we can't do that because we don't have access
305 ;;; to special non-ANSI low-level things like special fops, and we
306 ;;; don't need to do that anyway because our code isn't going to be
307 ;;; cold loaded, so we use the ordinary load form system.
309 ;;; KLUDGE: A special hack causes this not to be called when we are
310 ;;; building code for the target Lisp. It would be tidier to just not
311 ;;; have it in place when we're building the target Lisp, but it
312 ;;; wasn't clear how to do that without rethinking DEF!STRUCT quite a
313 ;;; bit, so I punted. -- WHN 19990914
315 (defun make-load-form-for-layout (layout &optional env)
316 (declare (type layout layout))
317 (declare (ignore env))
318 (when (layout-invalid layout)
319 (compiler-error "can't dump reference to obsolete class: ~S"
320 (layout-classoid layout)))
321 (let ((name (classoid-name (layout-classoid layout))))
323 (compiler-error "can't dump anonymous LAYOUT: ~S" layout))
324 ;; Since LAYOUT refers to a class which refers back to the LAYOUT,
325 ;; we have to do this in two stages, like the TREE-WITH-PARENT
326 ;; example in the MAKE-LOAD-FORM entry in the ANSI spec.
328 ;; "creation" form (which actually doesn't create a new LAYOUT if
329 ;; there's a preexisting one with this name)
330 `(find-layout ',name)
331 ;; "initialization" form (which actually doesn't initialize
332 ;; preexisting LAYOUTs, just checks that they're consistent).
333 `(init-or-check-layout ',layout
334 ',(layout-classoid layout)
335 ',(layout-length layout)
336 ',(layout-inherits layout)
337 ',(layout-depthoid layout)))))
339 ;;; If LAYOUT's slot values differ from the specified slot values in
340 ;;; any interesting way, then give a warning and return T.
341 (declaim (ftype (function (simple-string
347 redefine-layout-warning))
348 (defun redefine-layout-warning (old-context old-layout
349 context length inherits depthoid)
350 (declare (type layout old-layout) (type simple-string old-context context))
351 (let ((name (layout-proper-name old-layout)))
352 (or (let ((old-inherits (layout-inherits old-layout)))
353 (or (when (mismatch old-inherits
355 :key #'layout-proper-name)
356 (warn "change in superclasses of class ~S:~% ~
357 ~A superclasses: ~S~% ~
361 (map 'list #'layout-proper-name old-inherits)
363 (map 'list #'layout-proper-name inherits))
365 (let ((diff (mismatch old-inherits inherits)))
369 ~:(~A~) definition of superclass ~S is incompatible with~% ~
373 (layout-proper-name (svref old-inherits diff))
376 (let ((old-length (layout-length old-layout)))
377 (unless (= old-length length)
378 (warn "change in instance length of class ~S:~% ~
382 old-context old-length
385 (unless (= (layout-depthoid old-layout) depthoid)
386 (warn "change in the inheritance structure of class ~S~% ~
387 between the ~A definition and the ~A definition"
388 name old-context context)
391 ;;; Require that LAYOUT data be consistent with CLASS, LENGTH,
392 ;;; INHERITS, and DEPTHOID.
393 (declaim (ftype (function
394 (layout classoid index simple-vector layout-depthoid))
396 (defun check-layout (layout classoid length inherits depthoid)
397 (aver (eq (layout-classoid layout) classoid))
398 (when (redefine-layout-warning "current" layout
399 "compile time" length inherits depthoid)
400 ;; Classic CMU CL had more options here. There are several reasons
401 ;; why they might want more options which are less appropriate for
402 ;; us: (1) It's hard to fit the classic CMU CL flexible approach
403 ;; into the ANSI-style MAKE-LOAD-FORM system, and having a
404 ;; non-MAKE-LOAD-FORM-style system is painful when we're trying to
405 ;; make the cross-compiler run under vanilla ANSI Common Lisp. (2)
406 ;; We have CLOS now, and if you want to be able to flexibly
407 ;; redefine classes without restarting the system, it'd make sense
408 ;; to use that, so supporting complexity in order to allow
409 ;; modifying DEFSTRUCTs without restarting the system is a low
410 ;; priority. (3) We now have the ability to rebuild the SBCL
411 ;; system from scratch, so we no longer need this functionality in
412 ;; order to maintain the SBCL system by modifying running images.
413 (error "The class ~S was not changed, and there's no guarantee that~@
414 the loaded code (which expected another layout) will work."
415 (layout-proper-name layout)))
418 ;;; a common idiom (the same as CMU CL FIND-LAYOUT) rolled up into a
419 ;;; single function call
421 ;;; Used by the loader to forward-reference layouts for classes whose
422 ;;; definitions may not have been loaded yet. This allows type tests
423 ;;; to be loaded when the type definition hasn't been loaded yet.
424 (declaim (ftype (function (symbol index simple-vector layout-depthoid) layout)
425 find-and-init-or-check-layout))
426 (defun find-and-init-or-check-layout (name length inherits depthoid)
427 (let ((layout (find-layout name)))
428 (init-or-check-layout layout
429 (or (find-classoid name nil)
430 (make-undefined-classoid name))
435 ;;; Record LAYOUT as the layout for its class, adding it as a subtype
436 ;;; of all superclasses. This is the operation that "installs" a
437 ;;; layout for a class in the type system, clobbering any old layout.
438 ;;; However, this does not modify the class namespace; that is a
439 ;;; separate operation (think anonymous classes.)
440 ;;; -- If INVALIDATE, then all the layouts for any old definition
441 ;;; and subclasses are invalidated, and the SUBCLASSES slot is cleared.
442 ;;; -- If DESTRUCT-LAYOUT, then this is some old layout, and is to be
443 ;;; destructively modified to hold the same type information.
444 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
445 (defun register-layout (layout &key (invalidate t) destruct-layout)
446 (declare (type layout layout) (type (or layout null) destruct-layout))
447 (let* ((classoid (layout-classoid layout))
448 (classoid-layout (classoid-layout classoid))
449 (subclasses (classoid-subclasses classoid)))
451 ;; Attempting to register ourselves with a temporary undefined
452 ;; class placeholder is almost certainly a programmer error. (I
453 ;; should know, I did it.) -- WHN 19990927
454 (aver (not (undefined-classoid-p classoid)))
456 ;; This assertion dates from classic CMU CL. The rationale is
457 ;; probably that calling REGISTER-LAYOUT more than once for the
458 ;; same LAYOUT is almost certainly a programmer error.
459 (aver (not (eq classoid-layout layout)))
461 ;; Figure out what classes are affected by the change, and issue
462 ;; appropriate warnings and invalidations.
463 (when classoid-layout
464 (modify-classoid classoid)
466 (dohash (subclass subclass-layout subclasses)
467 (modify-classoid subclass)
469 (invalidate-layout subclass-layout))))
471 (invalidate-layout classoid-layout)
472 (setf (classoid-subclasses classoid) nil)))
475 (setf (layout-invalid destruct-layout) nil
476 (layout-inherits destruct-layout) (layout-inherits layout)
477 (layout-depthoid destruct-layout)(layout-depthoid layout)
478 (layout-length destruct-layout) (layout-length layout)
479 (layout-info destruct-layout) (layout-info layout)
480 (classoid-layout classoid) destruct-layout)
481 (setf (layout-invalid layout) nil
482 (classoid-layout classoid) layout))
484 (let ((inherits (layout-inherits layout)))
485 (dotimes (i (length inherits)) ; FIXME: should be DOVECTOR
486 (let* ((super (layout-classoid (svref inherits i)))
487 (subclasses (or (classoid-subclasses super)
488 (setf (classoid-subclasses super)
489 (make-hash-table :test 'eq)))))
490 (when (and (eq (classoid-state super) :sealed)
491 (not (gethash classoid subclasses)))
492 (warn "unsealing sealed class ~S in order to subclass it"
493 (classoid-name super))
494 (setf (classoid-state super) :read-only))
495 (setf (gethash classoid subclasses)
496 (or destruct-layout layout))))))
501 ;;; Arrange the inherited layouts to appear at their expected depth,
502 ;;; ensuring that hierarchical type tests succeed. Layouts with
503 ;;; DEPTHOID >= 0 (i.e. hierarchical classes) are placed first,
504 ;;; at exactly that index in the INHERITS vector. Then, non-hierarchical
505 ;;; layouts are placed in remaining elements. Then, any still-empty
506 ;;; elements are filled with their successors, ensuring that each
507 ;;; element contains a valid layout.
509 ;;; This reordering may destroy CPL ordering, so the inherits should
510 ;;; not be read as being in CPL order.
511 (defun order-layout-inherits (layouts)
512 (declare (simple-vector layouts))
513 (let ((length (length layouts))
516 (let ((depth (layout-depthoid (svref layouts i))))
517 (when (> depth max-depth)
518 (setf max-depth depth))))
519 (let* ((new-length (max (1+ max-depth) length))
520 (inherits (make-array new-length)))
522 (let* ((layout (svref layouts i))
523 (depth (layout-depthoid layout)))
524 (unless (eql depth -1)
525 (let ((old-layout (svref inherits depth)))
526 (unless (or (eql old-layout 0) (eq old-layout layout))
527 (error "layout depth conflict: ~S~%" layouts)))
528 (setf (svref inherits depth) layout))))
532 (declare (type index i j))
533 (let* ((layout (svref layouts i))
534 (depth (layout-depthoid layout)))
536 (loop (when (eql (svref inherits j) 0)
539 (setf (svref inherits j) layout))))
540 (do ((i (1- new-length) (1- i)))
542 (declare (type fixnum i))
543 (when (eql (svref inherits i) 0)
544 (setf (svref inherits i) (svref inherits (1+ i)))))
547 ;;;; class precedence lists
549 ;;; Topologically sort the list of objects to meet a set of ordering
550 ;;; constraints given by pairs (A . B) constraining A to precede B.
551 ;;; When there are multiple objects to choose, the tie-breaker
552 ;;; function is called with both the list of object to choose from and
553 ;;; the reverse ordering built so far.
554 (defun topological-sort (objects constraints tie-breaker)
555 (declare (list objects constraints)
556 (function tie-breaker))
557 (let ((obj-info (make-hash-table :size (length objects)))
560 (dolist (constraint constraints)
561 (let ((obj1 (car constraint))
562 (obj2 (cdr constraint)))
563 (let ((info2 (gethash obj2 obj-info)))
566 (setf (gethash obj2 obj-info) (list 1))))
567 (let ((info1 (gethash obj1 obj-info)))
569 (push obj2 (rest info1))
570 (setf (gethash obj1 obj-info) (list 0 obj2))))))
571 (dolist (obj objects)
572 (let ((info (gethash obj obj-info)))
573 (when (or (not info) (zerop (first info)))
574 (push obj free-objs))))
576 (flet ((next-result (obj)
578 (dolist (successor (rest (gethash obj obj-info)))
579 (let* ((successor-info (gethash successor obj-info))
580 (count (1- (first successor-info))))
581 (setf (first successor-info) count)
583 (push successor free-objs))))))
584 (cond ((endp free-objs)
585 (dohash (obj info obj-info)
586 (unless (zerop (first info))
587 (error "Topological sort failed due to constraint on ~S."
589 (return (nreverse result)))
590 ((endp (rest free-objs))
591 (next-result (pop free-objs)))
593 (let ((obj (funcall tie-breaker free-objs result)))
594 (setf free-objs (remove obj free-objs))
595 (next-result obj))))))))
598 ;;; standard class precedence list computation
599 (defun std-compute-class-precedence-list (class)
602 (labels ((note-class (class)
603 (unless (member class classes)
605 (let ((superclasses (classoid-direct-superclasses class)))
607 (rest superclasses (rest rest)))
609 (let ((next (first rest)))
610 (push (cons prev next) constraints)
612 (dolist (class superclasses)
613 (note-class class)))))
614 (std-cpl-tie-breaker (free-classes rev-cpl)
615 (dolist (class rev-cpl (first free-classes))
616 (let* ((superclasses (classoid-direct-superclasses class))
617 (intersection (intersection free-classes
620 (return (first intersection)))))))
622 (topological-sort classes constraints #'std-cpl-tie-breaker))))
624 ;;;; object types to represent classes
626 ;;; An UNDEFINED-CLASSOID is a cookie we make up to stick in forward
627 ;;; referenced layouts. Users should never see them.
628 (def!struct (undefined-classoid
630 (:constructor make-undefined-classoid (name))))
632 ;;; BUILT-IN-CLASS is used to represent the standard classes that
633 ;;; aren't defined with DEFSTRUCT and other specially implemented
634 ;;; primitive types whose only attribute is their name.
636 ;;; Some BUILT-IN-CLASSes have a TRANSLATION, which means that they
637 ;;; are effectively DEFTYPE'd to some other type (usually a union of
638 ;;; other classes or a "primitive" type such as NUMBER, ARRAY, etc.)
639 ;;; This translation is done when type specifiers are parsed. Type
640 ;;; system operations (union, subtypep, etc.) should never encounter
641 ;;; translated classes, only their translation.
642 (def!struct (built-in-classoid (:include classoid)
643 (:constructor make-built-in-classoid))
644 ;; the type we translate to on parsing. If NIL, then this class
645 ;; stands on its own; or it can be set to :INITIALIZING for a period
647 (translation nil :type (or ctype (member nil :initializing))))
649 ;;; FIXME: In CMU CL, this was a class with a print function, but not
650 ;;; necessarily a structure class (e.g. CONDITIONs). In SBCL,
651 ;;; we let CLOS handle our print functions, so that is no longer needed.
652 ;;; Is there any need for this class any more?
653 (def!struct (slot-classoid (:include classoid)
656 ;;; STRUCTURE-CLASS represents what we need to know about structure
657 ;;; classes. Non-structure "typed" defstructs are a special case, and
658 ;;; don't have a corresponding class.
659 (def!struct (basic-structure-classoid (:include slot-classoid)
662 (def!struct (structure-classoid (:include basic-structure-classoid)
663 (:constructor make-structure-classoid))
664 ;; If true, a default keyword constructor for this structure.
665 (constructor nil :type (or function null)))
667 ;;; FUNCALLABLE-STRUCTURE-CLASS is used to represent funcallable
668 ;;; structures, which are used to implement generic functions.
669 (def!struct (funcallable-structure-classoid
670 (:include basic-structure-classoid)
671 (:constructor make-funcallable-structure-classoid)))
673 ;;;; classoid namespace
675 ;;; We use an indirection to allow forward referencing of class
676 ;;; definitions with load-time resolution.
677 (def!struct (classoid-cell
678 (:constructor make-classoid-cell (name &optional classoid))
679 (:make-load-form-fun (lambda (c)
681 ',(classoid-cell-name c))))
682 #-no-ansi-print-object
683 (:print-object (lambda (s stream)
684 (print-unreadable-object (s stream :type t)
685 (prin1 (classoid-cell-name s) stream)))))
686 ;; Name of class we expect to find.
687 (name nil :type symbol :read-only t)
688 ;; Class or NIL if not yet defined.
689 (classoid nil :type (or classoid null)))
690 (defun find-classoid-cell (name)
691 (or (info :type :classoid name)
692 (setf (info :type :classoid name)
693 (make-classoid-cell name))))
695 ;;; FIXME: When the system is stable, this DECLAIM FTYPE should
696 ;;; probably go away in favor of the DEFKNOWN for FIND-CLASS.
697 (declaim (ftype (function (symbol &optional t (or null sb!c::lexenv)))
699 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
700 (defun find-classoid (name &optional (errorp t) environment)
702 "Return the class with the specified NAME. If ERRORP is false, then NIL is
703 returned when no such class exists."
704 (declare (type symbol name) (ignore environment))
705 (let ((res (classoid-cell-classoid (find-classoid-cell name))))
706 (if (or res (not errorp))
708 (error "class not yet defined:~% ~S" name))))
709 (defun (setf find-classoid) (new-value name)
710 #-sb-xc (declare (type classoid new-value))
711 (ecase (info :type :kind name)
713 (:forthcoming-defclass-type
714 ;; XXX Currently, nothing needs to be done in this case. Later, when
715 ;; PCL is integrated tighter into SBCL, this might need more work.
719 (let ((old (classoid-of (find-classoid name)))
720 (new (classoid-of new-value)))
722 (warn "changing meta-class of ~S from ~S to ~S"
725 (classoid-name new)))))
727 (error "illegal to redefine standard type ~S" name))
729 (warn "redefining DEFTYPE type to be a class: ~S" name)
730 (setf (info :type :expander name) nil)))
732 (remhash name *forward-referenced-layouts*)
733 (%note-type-defined name)
734 (setf (info :type :kind name) :instance)
735 (setf (classoid-cell-classoid (find-classoid-cell name)) new-value)
736 (unless (eq (info :type :compiler-layout name)
737 (classoid-layout new-value))
738 (setf (info :type :compiler-layout name) (classoid-layout new-value)))
742 ;;; Called when we are about to define NAME as a class meeting some
743 ;;; predicate (such as a meta-class type test.) The first result is
744 ;;; always of the desired class. The second result is any existing
745 ;;; LAYOUT for this name.
746 (defun insured-find-classoid (name predicate constructor)
747 (declare (type function predicate constructor))
748 (let* ((old (find-classoid name nil))
749 (res (if (and old (funcall predicate old))
751 (funcall constructor :name name)))
752 (found (or (gethash name *forward-referenced-layouts*)
753 (when old (classoid-layout old)))))
755 (setf (layout-classoid found) res))
758 ;;; If the class has a proper name, return the name, otherwise return
760 (defun classoid-proper-name (class)
761 #-sb-xc (declare (type classoid class))
762 (let ((name (classoid-name class)))
763 (if (and name (eq (find-classoid name nil) class))
767 ;;;; CLASS type operations
769 (!define-type-class classoid)
771 ;;; Simple methods for TYPE= and SUBTYPEP should never be called when
772 ;;; the two classes are equal, since there are EQ checks in those
774 (!define-type-method (classoid :simple-=) (type1 type2)
775 (aver (not (eq type1 type2)))
778 (!define-type-method (classoid :simple-subtypep) (class1 class2)
779 (aver (not (eq class1 class2)))
780 (let ((subclasses (classoid-subclasses class2)))
781 (if (and subclasses (gethash class1 subclasses))
785 ;;; When finding the intersection of a sealed class and some other
786 ;;; class (not hierarchically related) the intersection is the union
787 ;;; of the currently shared subclasses.
788 (defun sealed-class-intersection2 (sealed other)
789 (declare (type classoid sealed other))
790 (let ((s-sub (classoid-subclasses sealed))
791 (o-sub (classoid-subclasses other)))
792 (if (and s-sub o-sub)
793 (collect ((res *empty-type* type-union))
794 (dohash (subclass layout s-sub)
795 (declare (ignore layout))
796 (when (gethash subclass o-sub)
797 (res (specifier-type subclass))))
801 (!define-type-method (classoid :simple-intersection2) (class1 class2)
802 (declare (type classoid class1 class2))
803 (cond ((eq class1 class2)
805 ;; If one is a subclass of the other, then that is the
807 ((let ((subclasses (classoid-subclasses class2)))
808 (and subclasses (gethash class1 subclasses)))
810 ((let ((subclasses (classoid-subclasses class1)))
811 (and subclasses (gethash class2 subclasses)))
813 ;; Otherwise, we can't in general be sure that the
814 ;; intersection is empty, since a subclass of both might be
815 ;; defined. But we can eliminate it for some special cases.
816 ((or (basic-structure-classoid-p class1)
817 (basic-structure-classoid-p class2))
818 ;; No subclass of both can be defined.
820 ((eq (classoid-state class1) :sealed)
821 ;; checking whether a subclass of both can be defined:
822 (sealed-class-intersection2 class1 class2))
823 ((eq (classoid-state class2) :sealed)
824 ;; checking whether a subclass of both can be defined:
825 (sealed-class-intersection2 class2 class1))
827 ;; uncertain, since a subclass of both might be defined
830 ;;; KLUDGE: we need this because of the need to represent
831 ;;; intersections of two classes, even when empty at a given time, as
832 ;;; uncanonicalized intersections because of the possibility of later
833 ;;; defining a subclass of both classes. The necessity for changing
834 ;;; the default return value from SUBTYPEP to NIL, T if no alternate
835 ;;; method is present comes about because, unlike the other places we
836 ;;; use INVOKE-COMPLEX-SUBTYPEP-ARG1-METHOD, in HAIRY methods and the
837 ;;; like, classes are in their own hierarchy with no possibility of
838 ;;; mixtures with other type classes.
839 (!define-type-method (classoid :complex-subtypep-arg2) (type1 class2)
840 (if (and (intersection-type-p type1)
841 (> (count-if #'classoid-p (intersection-type-types type1)) 1))
843 (invoke-complex-subtypep-arg1-method type1 class2 nil t)))
845 (!define-type-method (classoid :unparse) (type)
846 (classoid-proper-name type))
850 (def!struct (std-classoid (:include classoid)
852 (def!struct (standard-classoid (:include std-classoid)
853 (:constructor make-standard-classoid)))
854 (def!struct (random-pcl-classoid (:include std-classoid)
855 (:constructor make-random-pcl-classoid)))
857 ;;;; built-in classes
859 ;;; The BUILT-IN-CLASSES list is a data structure which configures the
860 ;;; creation of all the built-in classes. It contains all the info
861 ;;; that we need to maintain the mapping between classes, compile-time
862 ;;; types and run-time type codes. These options are defined:
864 ;;; :TRANSLATION (default none)
865 ;;; When this class is "parsed" as a type specifier, it is
866 ;;; translated into the specified internal type representation,
867 ;;; rather than being left as a class. This is used for types
868 ;;; which we want to canonicalize to some other kind of type
869 ;;; object because in general we want to be able to include more
870 ;;; information than just the class (e.g. for numeric types.)
872 ;;; :ENUMERABLE (default NIL)
873 ;;; The value of the :ENUMERABLE slot in the created class.
874 ;;; Meaningless in translated classes.
876 ;;; :STATE (default :SEALED)
877 ;;; The value of CLASS-STATE which we want on completion,
878 ;;; indicating whether subclasses can be created at run-time.
880 ;;; :HIERARCHICAL-P (default T unless any of the inherits are non-hierarchical)
881 ;;; True if we can assign this class a unique inheritance depth.
883 ;;; :CODES (default none)
884 ;;; Run-time type codes which should be translated back to this
885 ;;; class by CLASS-OF. Unspecified for abstract classes.
887 ;;; :INHERITS (default this class and T)
888 ;;; The class-precedence list for this class, with this class and
891 ;;; :DIRECT-SUPERCLASSES (default to head of CPL)
892 ;;; List of the direct superclasses of this class.
894 ;;; FIXME: This doesn't seem to be needed after cold init (and so can
895 ;;; probably be uninterned at the end of cold init).
896 (defvar *built-in-classes*)
898 (/show0 "setting *BUILT-IN-CLASSES*")
901 '((t :state :read-only :translation t)
902 (character :enumerable t :translation base-char)
903 (base-char :enumerable t
904 :inherits (character)
905 :codes (#.sb!vm:base-char-widetag))
906 (symbol :codes (#.sb!vm:symbol-header-widetag))
908 (instance :state :read-only)
910 (system-area-pointer :codes (#.sb!vm:sap-widetag))
911 (weak-pointer :codes (#.sb!vm:weak-pointer-widetag))
912 (code-component :codes (#.sb!vm:code-header-widetag))
913 (lra :codes (#.sb!vm:return-pc-header-widetag))
914 (fdefn :codes (#.sb!vm:fdefn-widetag))
915 (random-class) ; used for unknown type codes
918 :codes (#.sb!vm:closure-header-widetag
919 #.sb!vm:simple-fun-header-widetag)
921 (funcallable-instance
925 (array :translation array :codes (#.sb!vm:complex-array-widetag)
928 :translation simple-array :codes (#.sb!vm:simple-array-widetag)
931 :translation (or cons (member nil) vector))
933 :translation vector :codes (#.sb!vm:complex-vector-widetag)
934 :direct-superclasses (array sequence)
935 :inherits (array sequence))
937 :translation simple-vector :codes (#.sb!vm:simple-vector-widetag)
938 :direct-superclasses (vector simple-array)
939 :inherits (vector simple-array array sequence))
941 :translation bit-vector :codes (#.sb!vm:complex-bit-vector-widetag)
942 :inherits (vector array sequence))
944 :translation simple-bit-vector :codes (#.sb!vm:simple-bit-vector-widetag)
945 :direct-superclasses (bit-vector simple-array)
946 :inherits (bit-vector vector simple-array
948 (simple-array-unsigned-byte-2
949 :translation (simple-array (unsigned-byte 2) (*))
950 :codes (#.sb!vm:simple-array-unsigned-byte-2-widetag)
951 :direct-superclasses (vector simple-array)
952 :inherits (vector simple-array array sequence))
953 (simple-array-unsigned-byte-4
954 :translation (simple-array (unsigned-byte 4) (*))
955 :codes (#.sb!vm:simple-array-unsigned-byte-4-widetag)
956 :direct-superclasses (vector simple-array)
957 :inherits (vector simple-array array sequence))
958 (simple-array-unsigned-byte-8
959 :translation (simple-array (unsigned-byte 8) (*))
960 :codes (#.sb!vm:simple-array-unsigned-byte-8-widetag)
961 :direct-superclasses (vector simple-array)
962 :inherits (vector simple-array array sequence))
963 (simple-array-unsigned-byte-16
964 :translation (simple-array (unsigned-byte 16) (*))
965 :codes (#.sb!vm:simple-array-unsigned-byte-16-widetag)
966 :direct-superclasses (vector simple-array)
967 :inherits (vector simple-array array sequence))
968 (simple-array-unsigned-byte-32
969 :translation (simple-array (unsigned-byte 32) (*))
970 :codes (#.sb!vm:simple-array-unsigned-byte-32-widetag)
971 :direct-superclasses (vector simple-array)
972 :inherits (vector simple-array array sequence))
973 (simple-array-signed-byte-8
974 :translation (simple-array (signed-byte 8) (*))
975 :codes (#.sb!vm:simple-array-signed-byte-8-widetag)
976 :direct-superclasses (vector simple-array)
977 :inherits (vector simple-array array sequence))
978 (simple-array-signed-byte-16
979 :translation (simple-array (signed-byte 16) (*))
980 :codes (#.sb!vm:simple-array-signed-byte-16-widetag)
981 :direct-superclasses (vector simple-array)
982 :inherits (vector simple-array array sequence))
983 (simple-array-signed-byte-30
984 :translation (simple-array (signed-byte 30) (*))
985 :codes (#.sb!vm:simple-array-signed-byte-30-widetag)
986 :direct-superclasses (vector simple-array)
987 :inherits (vector simple-array array sequence))
988 (simple-array-signed-byte-32
989 :translation (simple-array (signed-byte 32) (*))
990 :codes (#.sb!vm:simple-array-signed-byte-32-widetag)
991 :direct-superclasses (vector simple-array)
992 :inherits (vector simple-array array sequence))
993 (simple-array-single-float
994 :translation (simple-array single-float (*))
995 :codes (#.sb!vm:simple-array-single-float-widetag)
996 :direct-superclasses (vector simple-array)
997 :inherits (vector simple-array array sequence))
998 (simple-array-double-float
999 :translation (simple-array double-float (*))
1000 :codes (#.sb!vm:simple-array-double-float-widetag)
1001 :direct-superclasses (vector simple-array)
1002 :inherits (vector simple-array array sequence))
1004 (simple-array-long-float
1005 :translation (simple-array long-float (*))
1006 :codes (#.sb!vm:simple-array-long-float-widetag)
1007 :direct-superclasses (vector simple-array)
1008 :inherits (vector simple-array array sequence))
1009 (simple-array-complex-single-float
1010 :translation (simple-array (complex single-float) (*))
1011 :codes (#.sb!vm:simple-array-complex-single-float-widetag)
1012 :direct-superclasses (vector simple-array)
1013 :inherits (vector simple-array array sequence))
1014 (simple-array-complex-double-float
1015 :translation (simple-array (complex double-float) (*))
1016 :codes (#.sb!vm:simple-array-complex-double-float-widetag)
1017 :direct-superclasses (vector simple-array)
1018 :inherits (vector simple-array array sequence))
1020 (simple-array-complex-long-float
1021 :translation (simple-array (complex long-float) (*))
1022 :codes (#.sb!vm:simple-array-complex-long-float-widetag)
1023 :direct-superclasses (vector simple-array)
1024 :inherits (vector simple-array array sequence))
1027 :codes (#.sb!vm:complex-string-widetag)
1028 :direct-superclasses (vector)
1029 :inherits (vector array sequence))
1031 :translation simple-string
1032 :codes (#.sb!vm:simple-string-widetag)
1033 :direct-superclasses (string simple-array)
1034 :inherits (string vector simple-array
1037 :translation (or cons (member nil))
1038 :inherits (sequence))
1040 :codes (#.sb!vm:list-pointer-lowtag)
1042 :inherits (list sequence))
1044 :translation (member nil)
1045 :inherits (symbol list sequence)
1046 :direct-superclasses (symbol list))
1047 (number :translation number)
1049 :translation complex
1051 :codes (#.sb!vm:complex-widetag))
1052 (complex-single-float
1053 :translation (complex single-float)
1054 :inherits (complex number)
1055 :codes (#.sb!vm:complex-single-float-widetag))
1056 (complex-double-float
1057 :translation (complex double-float)
1058 :inherits (complex number)
1059 :codes (#.sb!vm:complex-double-float-widetag))
1062 :translation (complex long-float)
1063 :inherits (complex number)
1064 :codes (#.sb!vm:complex-long-float-widetag))
1065 (real :translation real :inherits (number))
1068 :inherits (real number))
1070 :translation single-float
1071 :inherits (float real number)
1072 :codes (#.sb!vm:single-float-widetag))
1074 :translation double-float
1075 :inherits (float real number)
1076 :codes (#.sb!vm:double-float-widetag))
1079 :translation long-float
1080 :inherits (float real number)
1081 :codes (#.sb!vm:long-float-widetag))
1083 :translation rational
1084 :inherits (real number))
1086 :translation (and rational (not integer))
1087 :inherits (rational real number)
1088 :codes (#.sb!vm:ratio-widetag))
1090 :translation integer
1091 :inherits (rational real number))
1093 :translation (integer #.sb!xc:most-negative-fixnum
1094 #.sb!xc:most-positive-fixnum)
1095 :inherits (integer rational real number)
1096 :codes (#.sb!vm:even-fixnum-lowtag #.sb!vm:odd-fixnum-lowtag))
1098 :translation (and integer (not fixnum))
1099 :inherits (integer rational real number)
1100 :codes (#.sb!vm:bignum-widetag))
1104 :inherits (instance)))))
1106 ;;; comment from CMU CL:
1107 ;;; See also type-init.lisp where we finish setting up the
1108 ;;; translations for built-in types.
1110 (dolist (x *built-in-classes*)
1111 #-sb-xc-host (/show0 "at head of loop over *BUILT-IN-CLASSES*")
1114 (translation nil trans-p)
1120 (hierarchical-p t) ; might be modified below
1121 (direct-superclasses (if inherits
1122 (list (car inherits))
1125 (declare (ignore codes state translation))
1126 (let ((inherits-list (if (eq name t)
1128 (cons t (reverse inherits))))
1129 (classoid (make-built-in-classoid
1130 :enumerable enumerable
1132 :translation (if trans-p :initializing nil)
1133 :direct-superclasses
1136 (mapcar #'find-classoid direct-superclasses)))))
1137 (setf (info :type :kind name) #+sb-xc-host :defined #-sb-xc-host :primitive
1138 (classoid-cell-classoid (find-classoid-cell name)) classoid)
1140 (setf (info :type :builtin name) classoid))
1141 (let* ((inherits-vector
1145 (classoid-layout (find-classoid x))))
1146 (when (minusp (layout-depthoid super-layout))
1147 (setf hierarchical-p nil))
1150 (depthoid (if hierarchical-p
1151 (or depth (length inherits-vector))
1154 (find-and-init-or-check-layout name
1158 :invalidate nil)))))
1159 (/show0 "done with loop over *BUILT-IN-CLASSES*"))
1161 ;;; Define temporary PCL STANDARD-CLASSes. These will be set up
1162 ;;; correctly and the Lisp layout replaced by a PCL wrapper after PCL
1163 ;;; is loaded and the class defined.
1165 (/show0 "about to define temporary STANDARD-CLASSes")
1166 (dolist (x '(;; Why is STREAM duplicated in this list? Because, when
1167 ;; the inherits-vector of FUNDAMENTAL-STREAM is set up,
1168 ;; a vector containing the elements of the list below,
1169 ;; i.e. '(T INSTANCE STREAM STREAM), is created, and
1170 ;; this is what the function ORDER-LAYOUT-INHERITS
1173 ;; So, the purpose is to guarantee a valid layout for
1174 ;; the FUNDAMENTAL-STREAM class, matching what
1175 ;; ORDER-LAYOUT-INHERITS would do.
1176 ;; ORDER-LAYOUT-INHERITS would place STREAM at index 3
1177 ;; in the INHERITS(-VECTOR). Index 2 would not be
1178 ;; filled, so STREAM is duplicated there (as
1179 ;; ORDER-LAYOUTS-INHERITS would do). Maybe the
1180 ;; duplicate definition could be removed (removing a
1181 ;; STREAM element), because FUNDAMENTAL-STREAM is
1182 ;; redefined after PCL is set up, anyway. But to play
1183 ;; it safely, we define the class with a valid INHERITS
1185 (fundamental-stream (t instance stream stream))))
1186 (/show0 "defining temporary STANDARD-CLASS")
1187 (let* ((name (first x))
1188 (inherits-list (second x))
1189 (classoid (make-standard-classoid :name name))
1190 (classoid-cell (find-classoid-cell name)))
1191 ;; Needed to open-code the MAP, below
1192 (declare (type list inherits-list))
1193 (setf (classoid-cell-classoid classoid-cell) classoid
1194 (info :type :classoid name) classoid-cell
1195 (info :type :kind name) :instance)
1196 (let ((inherits (map 'simple-vector
1198 (classoid-layout (find-classoid x)))
1200 #-sb-xc-host (/show0 "INHERITS=..") #-sb-xc-host (/hexstr inherits)
1201 (register-layout (find-and-init-or-check-layout name 0 inherits -1)
1203 (/show0 "done defining temporary STANDARD-CLASSes"))
1205 ;;; Now that we have set up the class heterarchy, seal the sealed
1206 ;;; classes. This must be done after the subclasses have been set up.
1208 (dolist (x *built-in-classes*)
1209 (destructuring-bind (name &key (state :sealed) &allow-other-keys) x
1210 (setf (classoid-state (find-classoid name)) state))))
1212 ;;;; class definition/redefinition
1214 ;;; This is to be called whenever we are altering a class.
1215 (defun modify-classoid (classoid)
1217 (when (member (classoid-state classoid) '(:read-only :frozen))
1218 ;; FIXME: This should probably be CERROR.
1219 (warn "making ~(~A~) class ~S writable"
1220 (classoid-state classoid)
1221 (classoid-name classoid))
1222 (setf (classoid-state classoid) nil)))
1224 ;;; Mark LAYOUT as invalid. Setting DEPTHOID -1 helps cause unsafe
1225 ;;; structure type tests to fail. Remove class from all superclasses
1226 ;;; too (might not be registered, so might not be in subclasses of the
1227 ;;; nominal superclasses.)
1228 (defun invalidate-layout (layout)
1229 (declare (type layout layout))
1230 (setf (layout-invalid layout) t
1231 (layout-depthoid layout) -1)
1232 (let ((inherits (layout-inherits layout))
1233 (classoid (layout-classoid layout)))
1234 (modify-classoid classoid)
1235 (dotimes (i (length inherits)) ; FIXME: DOVECTOR
1236 (let* ((super (svref inherits i))
1237 (subs (classoid-subclasses (layout-classoid super))))
1239 (remhash classoid subs)))))
1242 ;;;; cold loading initializations
1244 ;;; FIXME: It would be good to arrange for this to be called when the
1245 ;;; cross-compiler is being built, not just when the target Lisp is
1246 ;;; being cold loaded. Perhaps this could be moved to its own file
1247 ;;; late in the build-order.lisp-expr sequence, and be put in
1248 ;;; !COLD-INIT-FORMS there?
1249 (defun !class-finalize ()
1250 (dohash (name layout *forward-referenced-layouts*)
1251 (let ((class (find-classoid name nil)))
1253 (setf (layout-classoid layout) (make-undefined-classoid name)))
1254 ((eq (classoid-layout class) layout)
1255 (remhash name *forward-referenced-layouts*))
1258 (warn "something strange with forward layout for ~S:~% ~S"
1262 ;;; a vector that maps type codes to layouts, used for quickly finding
1263 ;;; the layouts of built-in classes
1264 (defvar *built-in-class-codes*) ; initialized in cold load
1265 (declaim (type simple-vector *built-in-class-codes*))
1268 #-sb-xc-host (/show0 "about to set *BUILT-IN-CLASS-CODES*")
1269 (setq *built-in-class-codes*
1270 (let* ((initial-element
1272 ;; KLUDGE: There's a FIND-CLASSOID DEFTRANSFORM for
1273 ;; constant class names which creates fast but
1274 ;; non-cold-loadable, non-compact code. In this
1275 ;; context, we'd rather have compact, cold-loadable
1276 ;; code. -- WHN 19990928
1277 (declare (notinline find-classoid))
1278 (classoid-layout (find-classoid 'random-class))))
1279 (res (make-array 256 :initial-element initial-element)))
1280 (dolist (x *built-in-classes* res)
1281 (destructuring-bind (name &key codes &allow-other-keys)
1283 (let ((layout (classoid-layout (find-classoid name))))
1284 (dolist (code codes)
1285 (setf (svref res code) layout)))))))
1286 #-sb-xc-host (/show0 "done setting *BUILT-IN-CLASS-CODES*"))
1288 (!defun-from-collected-cold-init-forms !classes-cold-init)