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.
5 ;;;; This software is part of the SBCL system. See the README file for
8 ;;;; This software is derived from the CMU CL system, which was
9 ;;;; written at Carnegie Mellon University and released into the
10 ;;;; public domain. The software is in the public domain and is
11 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
12 ;;;; files for more information.
14 (in-package "SB!KERNEL")
16 (!begin-collecting-cold-init-forms)
18 ;;;; the CLASSOID structure
20 ;;; The CLASSOID structure is a supertype of all classoid types. A
21 ;;; CLASSOID is also a CTYPE structure as recognized by the type
22 ;;; system. (FIXME: It's also a type specifier, though this might go
23 ;;; away as with the merger of SB-PCL:CLASS and CL:CLASS it's no
26 (:make-load-form-fun classoid-make-load-form-fun)
28 (class-info (type-class-or-lose 'classoid)))
30 #-no-ansi-print-object
32 (lambda (class stream)
33 (let ((name (classoid-name class)))
34 (print-unreadable-object (class stream
38 ;; FIXME: Make sure that this prints
39 ;; reasonably for anonymous classes.
40 "~:[anonymous~;~:*~S~]~@[ (~(~A~))~]"
42 (classoid-state class))))))
43 #-sb-xc-host (:pure nil))
44 ;; the value to be returned by CLASSOID-NAME.
45 (name nil :type symbol)
46 ;; the current layout for this class, or NIL if none assigned yet
47 (layout nil :type (or layout null))
48 ;; How sure are we that this class won't be redefined?
49 ;; :READ-ONLY = We are committed to not changing the effective
50 ;; slots or superclasses.
51 ;; :SEALED = We can't even add subclasses.
52 ;; NIL = Anything could happen.
53 (state nil :type (member nil :read-only :sealed))
54 ;; direct superclasses of this class
55 (direct-superclasses () :type list)
56 ;; representation of all of the subclasses (direct or indirect) of
57 ;; this class. This is NIL if no subclasses or not initalized yet;
58 ;; otherwise, it's an EQ hash-table mapping CLASSOID objects to the
59 ;; subclass layout that was in effect at the time the subclass was
61 (subclasses nil :type (or null hash-table))
62 ;; the PCL class (= CL:CLASS, but with a view to future flexibility
63 ;; we don't just call it the CLASS slot) object for this class, or
64 ;; NIL if none assigned yet
67 (defun classoid-make-load-form-fun (class)
68 (/show "entering CLASSOID-MAKE-LOAD-FORM-FUN" class)
69 (let ((name (classoid-name class)))
70 (unless (and name (eq (find-classoid name nil) class))
71 (/show "anonymous/undefined class case")
72 (error "can't use anonymous or undefined class as constant:~% ~S"
75 ;; KLUDGE: There's a FIND-CLASSOID DEFTRANSFORM for constant
76 ;; class names which creates fast but non-cold-loadable,
77 ;; non-compact code. In this context, we'd rather have compact,
78 ;; cold-loadable code. -- WHN 19990928
79 (declare (notinline find-classoid))
80 (find-classoid ',name))))
82 ;;;; basic LAYOUT stuff
84 ;;; Note: This bound is set somewhat less than MOST-POSITIVE-FIXNUM
85 ;;; in order to guarantee that several hash values can be added without
86 ;;; overflowing into a bignum.
87 (def!constant layout-clos-hash-limit (1+ (ash sb!xc:most-positive-fixnum -3))
89 "the exclusive upper bound on LAYOUT-CLOS-HASH values")
90 (def!type layout-clos-hash () '(integer 0 #.layout-clos-hash-limit))
92 ;;; a list of conses, initialized by genesis
94 ;;; In each cons, the car is the symbol naming the layout, and the
95 ;;; cdr is the layout itself.
96 (defvar *!initial-layouts*)
98 ;;; a table mapping class names to layouts for classes we have
99 ;;; referenced but not yet loaded. This is initialized from an alist
100 ;;; created by genesis describing the layouts that genesis created at
102 (defvar *forward-referenced-layouts*)
104 ;; Protected by *WORLD-LOCK*
105 (setq *forward-referenced-layouts* (make-hash-table :test 'equal))
107 (/show0 "processing *!INITIAL-LAYOUTS*")
108 (dolist (x *!initial-layouts*)
109 (setf (layout-clos-hash (cdr x)) (random-layout-clos-hash))
110 (setf (gethash (car x) *forward-referenced-layouts*)
112 (/show0 "done processing *!INITIAL-LAYOUTS*")))
114 ;;; The LAYOUT structure is pointed to by the first cell of instance
115 ;;; (or structure) objects. It represents what we need to know for
116 ;;; type checking and garbage collection. Whenever a class is
117 ;;; incompatibly redefined, a new layout is allocated. If two object's
118 ;;; layouts are EQ, then they are exactly the same type.
120 ;;; *** IMPORTANT ***
122 ;;; If you change the slots of LAYOUT, you need to alter genesis as
123 ;;; well, since the initialization of layout slots is hardcoded there.
125 ;;; FIXME: ...it would be better to automate this, of course...
127 ;; KLUDGE: A special hack keeps this from being
128 ;; called when building code for the
129 ;; cross-compiler. See comments at the DEFUN for
130 ;; this. -- WHN 19990914
131 (:make-load-form-fun #-sb-xc-host ignore-it
132 ;; KLUDGE: DEF!STRUCT at #+SB-XC-HOST
133 ;; time controls both the
134 ;; build-the-cross-compiler behavior
135 ;; and the run-the-cross-compiler
136 ;; behavior. The value below only
137 ;; works for build-the-cross-compiler.
138 ;; There's a special hack in
139 ;; EMIT-MAKE-LOAD-FORM which gives
140 ;; effectively IGNORE-IT behavior for
141 ;; LAYOUT at run-the-cross-compiler
142 ;; time. It would be cleaner to
143 ;; actually have an IGNORE-IT value
144 ;; stored, but it's hard to see how to
145 ;; do that concisely with the current
146 ;; DEF!STRUCT setup. -- WHN 19990930
148 make-load-form-for-layout))
149 ;; a pseudo-random hash value for use by CLOS. KLUDGE: The fact
150 ;; that this slot is at offset 1 is known to GENESIS.
151 (clos-hash (random-layout-clos-hash) :type layout-clos-hash)
152 ;; the class that this is a layout for
153 (classoid (missing-arg) :type classoid)
154 ;; The value of this slot can be:
155 ;; * :UNINITIALIZED if not initialized yet;
156 ;; * NIL if this is the up-to-date layout for a class; or
157 ;; * T if this layout has been invalidated (by being replaced by
158 ;; a new, more-up-to-date LAYOUT).
159 ;; * something else (probably a list) if the class is a PCL wrapper
160 ;; and PCL has made it invalid and made a note to itself about it
161 (invalid :uninitialized :type (or cons (member nil t :uninitialized)))
162 ;; the layouts for all classes we inherit. If hierarchical, i.e. if
163 ;; DEPTHOID >= 0, then these are ordered by ORDER-LAYOUT-INHERITS
164 ;; (least to most specific), so that each inherited layout appears
165 ;; at its expected depth, i.e. at its LAYOUT-DEPTHOID value.
167 ;; Remaining elements are filled by the non-hierarchical layouts or,
168 ;; if they would otherwise be empty, by copies of succeeding layouts.
169 (inherits #() :type simple-vector)
170 ;; If inheritance is not hierarchical, this is -1. If inheritance is
171 ;; hierarchical, this is the inheritance depth, i.e. (LENGTH INHERITS).
173 ;; (1) This turns out to be a handy encoding for arithmetically
174 ;; comparing deepness; it is generally useful to do a bare numeric
175 ;; comparison of these depthoid values, and we hardly ever need to
176 ;; test whether the values are negative or not.
177 ;; (2) This was called INHERITANCE-DEPTH in classic CMU CL. It was
178 ;; renamed because some of us find it confusing to call something
179 ;; a depth when it isn't quite.
180 (depthoid -1 :type layout-depthoid)
181 ;; the number of top level descriptor cells in each instance
182 (length 0 :type index)
183 ;; If this layout has some kind of compiler meta-info, then this is
184 ;; it. If a structure, then we store the DEFSTRUCT-DESCRIPTION here.
186 ;; This is true if objects of this class are never modified to
187 ;; contain dynamic pointers in their slots or constant-like
188 ;; substructure (and hence can be copied into read-only space by
191 ;; This slot is known to the C runtime support code.
192 (pure nil :type (member t nil 0))
193 ;; Number of raw words at the end.
194 ;; This slot is known to the C runtime support code.
195 (n-untagged-slots 0 :type index)
196 ;; Definition location
197 (source-location nil)
198 ;; Information about slots in the class to PCL: this provides fast
199 ;; access to slot-definitions and locations by name, etc.
200 (slot-table #(nil) :type simple-vector)
201 ;; True IFF the layout belongs to a standand-instance or a
202 ;; standard-funcallable-instance -- that is, true only if the layout
203 ;; is really a wrapper.
205 ;; FIXME: If we unify wrappers and layouts this can go away, since
206 ;; it is only used in SB-PCL::EMIT-FETCH-WRAPPERS, which can then
207 ;; use INSTANCE-SLOTS-LAYOUT instead (if there is are no slot
208 ;; layouts, there are no slots for it to pull.)
209 (for-std-class-p nil :type boolean :read-only t))
211 (def!method print-object ((layout layout) stream)
212 (print-unreadable-object (layout stream :type t :identity t)
214 "for ~S~@[, INVALID=~S~]"
215 (layout-proper-name layout)
216 (layout-invalid layout))))
218 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
219 (defun layout-proper-name (layout)
220 (classoid-proper-name (layout-classoid layout))))
222 ;;;; support for the hash values used by CLOS when working with LAYOUTs
224 ;;; a generator for random values suitable for the CLOS-HASH slots of
225 ;;; LAYOUTs. We use our own RANDOM-STATE here because we'd like
226 ;;; pseudo-random values to come the same way in the target even when
227 ;;; we make minor changes to the system, in order to reduce the
228 ;;; mysteriousness of possible CLOS bugs.
229 (defvar *layout-clos-hash-random-state*)
230 (defun random-layout-clos-hash ()
231 ;; FIXME: I'm not sure why this expression is (1+ (RANDOM FOO)),
232 ;; returning a strictly positive value. I copied it verbatim from
233 ;; CMU CL INITIALIZE-LAYOUT-HASH, so presumably it works, but I
234 ;; dunno whether the hash values are really supposed to be 1-based.
235 ;; They're declared as INDEX.. Or is this a hack to try to avoid
236 ;; having to use bignum arithmetic? Or what? An explanation would be
239 ;; an explanation is provided in Kiczales and Rodriguez, "Efficient
240 ;; Method Dispatch in PCL", 1990. -- CSR, 2005-11-30
241 (1+ (random (1- layout-clos-hash-limit)
242 (if (boundp '*layout-clos-hash-random-state*)
243 *layout-clos-hash-random-state*
244 (setf *layout-clos-hash-random-state*
245 (make-random-state))))))
247 ;;; If we can't find any existing layout, then we create a new one
248 ;;; storing it in *FORWARD-REFERENCED-LAYOUTS*. In classic CMU CL, we
249 ;;; used to immediately check for compatibility, but for
250 ;;; cross-compilability reasons (i.e. convenience of using this
251 ;;; function in a MAKE-LOAD-FORM expression) that functionality has
252 ;;; been split off into INIT-OR-CHECK-LAYOUT.
253 (declaim (ftype (sfunction (symbol) layout) find-layout))
254 (defun find-layout (name)
255 ;; This seems to be currently used only from the compiler, but make
256 ;; it thread-safe all the same. We need to lock *F-R-L* before doing
257 ;; FIND-CLASSOID in case (SETF FIND-CLASSOID) happens in parallel.
258 (let ((table *forward-referenced-layouts*))
260 (let ((classoid (find-classoid name nil)))
261 (or (and classoid (classoid-layout classoid))
263 (setf (gethash name table)
264 (make-layout :classoid (or classoid (make-undefined-classoid name)))))))))
266 ;;; If LAYOUT is uninitialized, initialize it with CLASSOID, LENGTH,
267 ;;; INHERITS, and DEPTHOID, otherwise require that it be consistent
268 ;;; with CLASSOID, LENGTH, INHERITS, and DEPTHOID.
270 ;;; UNDEFINED-CLASS values are interpreted specially as "we don't know
271 ;;; anything about the class", so if LAYOUT is initialized, any
272 ;;; preexisting class slot value is OK, and if it's not initialized,
273 ;;; its class slot value is set to an UNDEFINED-CLASS. -- FIXME: This
274 ;;; is no longer true, :UNINITIALIZED used instead.
275 (declaim (ftype (function (layout classoid index simple-vector layout-depthoid
278 %init-or-check-layout))
279 (defun %init-or-check-layout
280 (layout classoid length inherits depthoid nuntagged)
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-n-untagged-slots layout) nuntagged
288 (layout-classoid layout) classoid
289 (layout-invalid layout) nil))
290 ;; FIXME: Now that LAYOUTs are born :UNINITIALIZED, maybe this
291 ;; clause is not needed?
292 ((not *type-system-initialized*)
293 (setf (layout-classoid layout) classoid))
295 ;; There was an old layout already initialized with old
296 ;; information, and we'll now check that old information
297 ;; which was known with certainty is consistent with current
298 ;; information which is known with certainty.
299 (check-layout layout classoid length inherits depthoid nuntagged)))
302 ;;; In code for the target Lisp, we don't use dump LAYOUTs using the
303 ;;; standard load form mechanism, we use special fops instead, in
304 ;;; order to make cold load come out right. But when we're building
305 ;;; the cross-compiler, we can't do that because we don't have access
306 ;;; to special non-ANSI low-level things like special fops, and we
307 ;;; don't need to do that anyway because our code isn't going to be
308 ;;; cold loaded, so we use the ordinary load form system.
310 ;;; KLUDGE: A special hack causes this not to be called when we are
311 ;;; building code for the target Lisp. It would be tidier to just not
312 ;;; have it in place when we're building the target Lisp, but it
313 ;;; wasn't clear how to do that without rethinking DEF!STRUCT quite a
314 ;;; bit, so I punted. -- WHN 19990914
316 (defun make-load-form-for-layout (layout &optional env)
317 (declare (type layout layout))
318 (declare (ignore env))
319 (when (layout-invalid layout)
320 (compiler-error "can't dump reference to obsolete class: ~S"
321 (layout-classoid layout)))
322 (let ((name (classoid-name (layout-classoid layout))))
324 (compiler-error "can't dump anonymous LAYOUT: ~S" layout))
325 ;; Since LAYOUT refers to a class which refers back to the LAYOUT,
326 ;; we have to do this in two stages, like the TREE-WITH-PARENT
327 ;; example in the MAKE-LOAD-FORM entry in the ANSI spec.
329 ;; "creation" form (which actually doesn't create a new LAYOUT if
330 ;; there's a preexisting one with this name)
331 `(find-layout ',name)
332 ;; "initialization" form (which actually doesn't initialize
333 ;; preexisting LAYOUTs, just checks that they're consistent).
334 `(%init-or-check-layout ',layout
335 ',(layout-classoid layout)
336 ',(layout-length layout)
337 ',(layout-inherits layout)
338 ',(layout-depthoid layout)
339 ',(layout-n-untagged-slots layout)))))
341 ;;; If LAYOUT's slot values differ from the specified slot values in
342 ;;; any interesting way, then give a warning and return T.
343 (declaim (ftype (function (simple-string
350 redefine-layout-warning))
351 (defun redefine-layout-warning (old-context old-layout
352 context length inherits depthoid nuntagged)
353 (declare (type layout old-layout) (type simple-string old-context context))
354 (let ((name (layout-proper-name old-layout)))
355 (or (let ((old-inherits (layout-inherits old-layout)))
356 (or (when (mismatch old-inherits
358 :key #'layout-proper-name)
359 (warn "change in superclasses of class ~S:~% ~
360 ~A superclasses: ~S~% ~
364 (map 'list #'layout-proper-name old-inherits)
366 (map 'list #'layout-proper-name inherits))
368 (let ((diff (mismatch old-inherits inherits)))
372 ~@(~A~) definition of superclass ~S is incompatible with~% ~
376 (layout-proper-name (svref old-inherits diff))
379 (let ((old-length (layout-length old-layout)))
380 (unless (= old-length length)
381 (warn "change in instance length of class ~S:~% ~
385 old-context old-length
388 (let ((old-nuntagged (layout-n-untagged-slots old-layout)))
389 (unless (= old-nuntagged nuntagged)
390 (warn "change in instance layout of class ~S:~% ~
391 ~A untagged slots: ~W~% ~
392 ~A untagged slots: ~W"
394 old-context old-nuntagged
397 (unless (= (layout-depthoid old-layout) depthoid)
398 (warn "change in the inheritance structure of class ~S~% ~
399 between the ~A definition and the ~A definition"
400 name old-context context)
403 ;;; Require that LAYOUT data be consistent with CLASS, LENGTH,
404 ;;; INHERITS, and DEPTHOID.
405 (declaim (ftype (function
406 (layout classoid index simple-vector layout-depthoid index))
408 (defun check-layout (layout classoid length inherits depthoid nuntagged)
409 (aver (eq (layout-classoid layout) classoid))
410 (when (redefine-layout-warning "current" layout
411 "compile time" length inherits depthoid
413 ;; Classic CMU CL had more options here. There are several reasons
414 ;; why they might want more options which are less appropriate for
415 ;; us: (1) It's hard to fit the classic CMU CL flexible approach
416 ;; into the ANSI-style MAKE-LOAD-FORM system, and having a
417 ;; non-MAKE-LOAD-FORM-style system is painful when we're trying to
418 ;; make the cross-compiler run under vanilla ANSI Common Lisp. (2)
419 ;; We have CLOS now, and if you want to be able to flexibly
420 ;; redefine classes without restarting the system, it'd make sense
421 ;; to use that, so supporting complexity in order to allow
422 ;; modifying DEFSTRUCTs without restarting the system is a low
423 ;; priority. (3) We now have the ability to rebuild the SBCL
424 ;; system from scratch, so we no longer need this functionality in
425 ;; order to maintain the SBCL system by modifying running images.
426 (error "The loaded code expects an incompatible layout for class ~S."
427 (layout-proper-name layout)))
430 ;;; a common idiom (the same as CMU CL FIND-LAYOUT) rolled up into a
431 ;;; single function call
433 ;;; Used by the loader to forward-reference layouts for classes whose
434 ;;; definitions may not have been loaded yet. This allows type tests
435 ;;; to be loaded when the type definition hasn't been loaded yet.
436 (declaim (ftype (function (symbol index simple-vector layout-depthoid index)
438 find-and-init-or-check-layout))
439 (defun find-and-init-or-check-layout (name length inherits depthoid nuntagged)
441 (let ((layout (find-layout name)))
442 (%init-or-check-layout layout
443 (or (find-classoid name nil)
444 (layout-classoid layout))
450 ;;; Record LAYOUT as the layout for its class, adding it as a subtype
451 ;;; of all superclasses. This is the operation that "installs" a
452 ;;; layout for a class in the type system, clobbering any old layout.
453 ;;; However, this does not modify the class namespace; that is a
454 ;;; separate operation (think anonymous classes.)
455 ;;; -- If INVALIDATE, then all the layouts for any old definition
456 ;;; and subclasses are invalidated, and the SUBCLASSES slot is cleared.
457 ;;; -- If DESTRUCT-LAYOUT, then this is some old layout, and is to be
458 ;;; destructively modified to hold the same type information.
459 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
460 (defun register-layout (layout &key (invalidate t) destruct-layout)
461 (declare (type layout layout) (type (or layout null) destruct-layout))
463 (let* ((classoid (layout-classoid layout))
464 (classoid-layout (classoid-layout classoid))
465 (subclasses (classoid-subclasses classoid)))
467 ;; Attempting to register ourselves with a temporary undefined
468 ;; class placeholder is almost certainly a programmer error. (I
469 ;; should know, I did it.) -- WHN 19990927
470 (aver (not (undefined-classoid-p classoid)))
472 ;; This assertion dates from classic CMU CL. The rationale is
473 ;; probably that calling REGISTER-LAYOUT more than once for the
474 ;; same LAYOUT is almost certainly a programmer error.
475 (aver (not (eq classoid-layout layout)))
477 ;; Figure out what classes are affected by the change, and issue
478 ;; appropriate warnings and invalidations.
479 (when classoid-layout
480 (%modify-classoid classoid)
482 (dohash ((subclass subclass-layout) subclasses :locked t)
483 (%modify-classoid subclass)
485 (%invalidate-layout subclass-layout))))
487 (%invalidate-layout classoid-layout)
488 (setf (classoid-subclasses classoid) nil)))
491 (setf (layout-invalid destruct-layout) nil
492 (layout-inherits destruct-layout) (layout-inherits layout)
493 (layout-depthoid destruct-layout)(layout-depthoid layout)
494 (layout-length destruct-layout) (layout-length layout)
495 (layout-n-untagged-slots destruct-layout) (layout-n-untagged-slots layout)
496 (layout-info destruct-layout) (layout-info layout)
497 (classoid-layout classoid) destruct-layout)
498 (setf (layout-invalid layout) nil
499 (classoid-layout classoid) layout))
501 (dovector (super-layout (layout-inherits layout))
502 (let* ((super (layout-classoid super-layout))
503 (subclasses (or (classoid-subclasses super)
504 (setf (classoid-subclasses super)
505 (make-hash-table :test 'eq
506 #-sb-xc-host #-sb-xc-host
508 (when (and (eq (classoid-state super) :sealed)
509 (not (gethash classoid subclasses)))
510 (warn "unsealing sealed class ~S in order to subclass it"
511 (classoid-name super))
512 (setf (classoid-state super) :read-only))
513 (setf (gethash classoid subclasses)
514 (or destruct-layout layout))))))
519 ;;; Arrange the inherited layouts to appear at their expected depth,
520 ;;; ensuring that hierarchical type tests succeed. Layouts with
521 ;;; DEPTHOID >= 0 (i.e. hierarchical classes) are placed first,
522 ;;; at exactly that index in the INHERITS vector. Then, non-hierarchical
523 ;;; layouts are placed in remaining elements. Then, any still-empty
524 ;;; elements are filled with their successors, ensuring that each
525 ;;; element contains a valid layout.
527 ;;; This reordering may destroy CPL ordering, so the inherits should
528 ;;; not be read as being in CPL order.
529 (defun order-layout-inherits (layouts)
530 (declare (simple-vector layouts))
531 (let ((length (length layouts))
534 (let ((depth (layout-depthoid (svref layouts i))))
535 (when (> depth max-depth)
536 (setf max-depth depth))))
537 (let* ((new-length (max (1+ max-depth) length))
538 ;; KLUDGE: 0 here is the "uninitialized" element. We need
539 ;; to specify it explicitly for portability purposes, as
540 ;; elements can be read before being set [ see below, "(EQL
541 ;; OLD-LAYOUT 0)" ]. -- CSR, 2002-04-20
542 (inherits (make-array new-length :initial-element 0)))
544 (let* ((layout (svref layouts i))
545 (depth (layout-depthoid layout)))
546 (unless (eql depth -1)
547 (let ((old-layout (svref inherits depth)))
548 (unless (or (eql old-layout 0) (eq old-layout layout))
549 (error "layout depth conflict: ~S~%" layouts)))
550 (setf (svref inherits depth) layout))))
554 (declare (type index i j))
555 (let* ((layout (svref layouts i))
556 (depth (layout-depthoid layout)))
558 (loop (when (eql (svref inherits j) 0)
561 (setf (svref inherits j) layout))))
562 (do ((i (1- new-length) (1- i)))
564 (declare (type fixnum i))
565 (when (eql (svref inherits i) 0)
566 (setf (svref inherits i) (svref inherits (1+ i)))))
569 ;;;; class precedence lists
571 ;;; Topologically sort the list of objects to meet a set of ordering
572 ;;; constraints given by pairs (A . B) constraining A to precede B.
573 ;;; When there are multiple objects to choose, the tie-breaker
574 ;;; function is called with both the list of object to choose from and
575 ;;; the reverse ordering built so far.
576 (defun topological-sort (objects constraints tie-breaker)
577 (declare (list objects constraints)
578 (function tie-breaker))
579 (let ((obj-info (make-hash-table :size (length objects)))
582 (dolist (constraint constraints)
583 (let ((obj1 (car constraint))
584 (obj2 (cdr constraint)))
585 (let ((info2 (gethash obj2 obj-info)))
588 (setf (gethash obj2 obj-info) (list 1))))
589 (let ((info1 (gethash obj1 obj-info)))
591 (push obj2 (rest info1))
592 (setf (gethash obj1 obj-info) (list 0 obj2))))))
593 (dolist (obj objects)
594 (let ((info (gethash obj obj-info)))
595 (when (or (not info) (zerop (first info)))
596 (push obj free-objs))))
598 (flet ((next-result (obj)
600 (dolist (successor (rest (gethash obj obj-info)))
601 (let* ((successor-info (gethash successor obj-info))
602 (count (1- (first successor-info))))
603 (setf (first successor-info) count)
605 (push successor free-objs))))))
606 (cond ((endp free-objs)
607 (dohash ((obj info) obj-info)
608 (unless (zerop (first info))
609 (error "Topological sort failed due to constraint on ~S."
611 (return (nreverse result)))
612 ((endp (rest free-objs))
613 (next-result (pop free-objs)))
615 (let ((obj (funcall tie-breaker free-objs result)))
616 (setf free-objs (remove obj free-objs))
617 (next-result obj))))))))
620 ;;; standard class precedence list computation
621 (defun std-compute-class-precedence-list (class)
624 (labels ((note-class (class)
625 (unless (member class classes)
627 (let ((superclasses (classoid-direct-superclasses class)))
629 (rest superclasses (rest rest)))
631 (let ((next (first rest)))
632 (push (cons prev next) constraints)
634 (dolist (class superclasses)
635 (note-class class)))))
636 (std-cpl-tie-breaker (free-classes rev-cpl)
637 (dolist (class rev-cpl (first free-classes))
638 (let* ((superclasses (classoid-direct-superclasses class))
639 (intersection (intersection free-classes
642 (return (first intersection)))))))
644 (topological-sort classes constraints #'std-cpl-tie-breaker))))
646 ;;;; object types to represent classes
648 ;;; An UNDEFINED-CLASSOID is a cookie we make up to stick in forward
649 ;;; referenced layouts. Users should never see them.
650 (def!struct (undefined-classoid
652 (:constructor make-undefined-classoid (name))))
654 ;;; BUILT-IN-CLASS is used to represent the standard classes that
655 ;;; aren't defined with DEFSTRUCT and other specially implemented
656 ;;; primitive types whose only attribute is their name.
658 ;;; Some BUILT-IN-CLASSes have a TRANSLATION, which means that they
659 ;;; are effectively DEFTYPE'd to some other type (usually a union of
660 ;;; other classes or a "primitive" type such as NUMBER, ARRAY, etc.)
661 ;;; This translation is done when type specifiers are parsed. Type
662 ;;; system operations (union, subtypep, etc.) should never encounter
663 ;;; translated classes, only their translation.
664 (def!struct (built-in-classoid (:include classoid)
665 (:constructor make-built-in-classoid))
666 ;; the type we translate to on parsing. If NIL, then this class
667 ;; stands on its own; or it can be set to :INITIALIZING for a period
669 (translation nil :type (or ctype (member nil :initializing))))
671 ;;; STRUCTURE-CLASS represents what we need to know about structure
672 ;;; classes. Non-structure "typed" defstructs are a special case, and
673 ;;; don't have a corresponding class.
674 (def!struct (structure-classoid (:include classoid)
675 (:constructor make-structure-classoid))
676 ;; If true, a default keyword constructor for this structure.
677 (constructor nil :type (or function null)))
679 ;;;; classoid namespace
681 ;;; We use an indirection to allow forward referencing of class
682 ;;; definitions with load-time resolution.
683 (def!struct (classoid-cell
684 (:constructor make-classoid-cell (name &optional classoid))
685 (:make-load-form-fun (lambda (c)
687 ',(classoid-cell-name c)
689 #-no-ansi-print-object
690 (:print-object (lambda (s stream)
691 (print-unreadable-object (s stream :type t)
692 (prin1 (classoid-cell-name s) stream)))))
693 ;; Name of class we expect to find.
694 (name nil :type symbol :read-only t)
695 ;; Classoid or NIL if not yet defined.
696 (classoid nil :type (or classoid null))
700 ;;; Protected by the hash-table lock, used only in FIND-CLASSOID-CELL.
701 (defvar *classoid-cells*)
703 (setq *classoid-cells* (make-hash-table :test 'eq)))
705 (defun find-classoid-cell (name &key create errorp)
706 (let ((table *classoid-cells*)
707 (real-name (uncross name)))
708 (or (with-locked-hash-table (table)
709 (or (gethash real-name table)
711 (setf (gethash real-name table) (make-classoid-cell real-name)))))
713 (error 'simple-type-error
715 :expected-type 'class
716 :format-control "Class not yet defined: ~S"
717 :format-arguments (list name))))))
719 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
721 ;; Return the classoid with the specified NAME. If ERRORP is false,
722 ;; then NIL is returned when no such class exists."
723 (defun find-classoid (name &optional (errorp t))
724 (declare (type symbol name))
725 (let ((cell (find-classoid-cell name :errorp errorp)))
726 (when cell (classoid-cell-classoid cell))))
728 (defun (setf find-classoid) (new-value name)
729 #-sb-xc (declare (type (or null classoid) new-value))
731 (let ((table *forward-referenced-layouts*))
733 (let ((cell (find-classoid-cell name :create t)))
734 (ecase (info :type :kind name)
736 (:forthcoming-defclass-type
737 ;; FIXME: Currently, nothing needs to be done in this case.
738 ;; Later, when PCL is integrated tighter into SBCL, this
739 ;; might need more work.
743 (let ((old-value (classoid-cell-classoid cell)))
745 ;; KLUDGE: The reason these clauses aren't directly
746 ;; parallel is that we need to use the internal
747 ;; CLASSOID structure ourselves, because we don't
748 ;; have CLASSes to work with until PCL is built. In
749 ;; the host, CLASSes have an approximately
750 ;; one-to-one correspondence with the target
751 ;; CLASSOIDs (as well as with the target CLASSes,
752 ;; modulo potential differences with respect to
755 (let ((old (class-of old-value))
756 (new (class-of new-value)))
758 (bug "Trying to change the metaclass of ~S from ~S to ~S in the ~
760 name (class-name old) (class-name new))))
762 (let ((old (classoid-of old-value))
763 (new (classoid-of new-value)))
765 (warn "Changing meta-class of ~S from ~S to ~S."
766 name (classoid-name old) (classoid-name new))))))
768 (error "Cannot redefine standard type ~S." name))
770 (warn "redefining DEFTYPE type to be a class: ~
771 ~/sb-impl::print-symbol-with-prefix/" name)
772 (setf (info :type :expander name) nil
773 (info :type :lambda-list name) nil
774 (info :type :source-location name) nil)))
777 (%note-type-defined name)
778 ;; we need to handle things like
779 ;; (setf (find-class 'foo) (find-class 'integer))
781 ;; (setf (find-class 'integer) (find-class 'integer))
782 (cond ((built-in-classoid-p new-value)
783 (setf (info :type :kind name)
784 (or (info :type :kind name) :defined))
785 (let ((translation (built-in-classoid-translation new-value)))
787 (setf (info :type :translator name)
788 (lambda (c) (declare (ignore c)) translation)))))
790 (setf (info :type :kind name) :instance)))
791 (setf (classoid-cell-classoid cell) new-value)
792 (unless (eq (info :type :compiler-layout name)
793 (classoid-layout new-value))
794 (setf (info :type :compiler-layout name)
795 (classoid-layout new-value))))))
798 (defun %clear-classoid (name cell)
799 (ecase (info :type :kind name)
803 (error "Attempt to remove :PRIMITIVE type: ~S" name))
804 ((:forthcoming-defclass-type :instance)
806 ;; Note: We cannot remove the classoid cell from the table,
807 ;; since compiled code may refer directly to the cell, and
808 ;; getting a different cell for a classoid with the same name
809 ;; just would not do.
811 ;; Remove the proper name of the classoid.
812 (setf (classoid-name (classoid-cell-classoid cell)) nil)
814 (setf (classoid-cell-classoid cell) nil
815 (classoid-cell-pcl-class cell) nil))
816 (setf (info :type :kind name) nil
817 (info :type :documentation name) nil
818 (info :type :compiler-layout name) nil)))))
820 ;;; Called when we are about to define NAME as a class meeting some
821 ;;; predicate (such as a meta-class type test.) The first result is
822 ;;; always of the desired class. The second result is any existing
823 ;;; LAYOUT for this name.
825 ;;; Again, this should be compiler-only, but easier to make this
827 (defun insured-find-classoid (name predicate constructor)
828 (declare (type function predicate constructor))
829 (let ((table *forward-referenced-layouts*))
830 (with-locked-hash-table (table)
831 (let* ((old (find-classoid name nil))
832 (res (if (and old (funcall predicate old))
834 (funcall constructor :name name)))
835 (found (or (gethash name table)
836 (when old (classoid-layout old)))))
838 (setf (layout-classoid found) res))
839 (values res found)))))
841 ;;; If the classoid has a proper name, return the name, otherwise return
843 (defun classoid-proper-name (classoid)
844 #-sb-xc (declare (type classoid classoid))
845 (let ((name (classoid-name classoid)))
846 (if (and name (eq (find-classoid name nil) classoid))
850 ;;;; CLASS type operations
852 (!define-type-class classoid)
854 ;;; We might be passed classoids with invalid layouts; in any pairwise
855 ;;; class comparison, we must ensure that both are valid before
857 (defun %ensure-classoid-valid (classoid layout)
858 (aver (eq classoid (layout-classoid layout)))
859 (when (layout-invalid layout)
860 (if (typep classoid 'standard-classoid)
861 (let ((class (classoid-pcl-class classoid)))
863 ((sb!pcl:class-finalized-p class)
864 (sb!pcl::%force-cache-flushes class))
865 ((sb!pcl::class-has-a-forward-referenced-superclass-p class)
866 (error "Invalid, unfinalizeable class ~S (classoid ~S)."
869 (sb!pcl:finalize-inheritance class))))
870 (error "Don't know how to ensure validity of ~S (not ~
871 a STANDARD-CLASSOID)." classoid))))
873 (defun %ensure-both-classoids-valid (class1 class2)
874 (do ((layout1 (classoid-layout class1) (classoid-layout class1))
875 (layout2 (classoid-layout class2) (classoid-layout class2))
877 ((and (not (layout-invalid layout1)) (not (layout-invalid layout2))))
879 (%ensure-classoid-valid class1 layout1)
880 (%ensure-classoid-valid class2 layout2)))
882 (defun update-object-layout-or-invalid (object layout)
883 (if (typep (classoid-of object) 'standard-classoid)
884 (sb!pcl::check-wrapper-validity object)
885 (sb!c::%layout-invalid-error object layout)))
887 ;;; Simple methods for TYPE= and SUBTYPEP should never be called when
888 ;;; the two classes are equal, since there are EQ checks in those
890 (!define-type-method (classoid :simple-=) (type1 type2)
891 (aver (not (eq type1 type2)))
894 (!define-type-method (classoid :simple-subtypep) (class1 class2)
895 (aver (not (eq class1 class2)))
897 (%ensure-both-classoids-valid class1 class2)
898 (let ((subclasses (classoid-subclasses class2)))
899 (if (and subclasses (gethash class1 subclasses))
903 ;;; When finding the intersection of a sealed class and some other
904 ;;; class (not hierarchically related) the intersection is the union
905 ;;; of the currently shared subclasses.
906 (defun sealed-class-intersection2 (sealed other)
907 (declare (type classoid sealed other))
908 (let ((s-sub (classoid-subclasses sealed))
909 (o-sub (classoid-subclasses other)))
910 (if (and s-sub o-sub)
911 (collect ((res *empty-type* type-union))
912 (dohash ((subclass layout) s-sub :locked t)
913 (declare (ignore layout))
914 (when (gethash subclass o-sub)
915 (res (specifier-type subclass))))
919 (!define-type-method (classoid :simple-intersection2) (class1 class2)
920 (declare (type classoid class1 class2))
922 (%ensure-both-classoids-valid class1 class2)
923 (cond ((eq class1 class2)
925 ;; If one is a subclass of the other, then that is the
927 ((let ((subclasses (classoid-subclasses class2)))
928 (and subclasses (gethash class1 subclasses)))
930 ((let ((subclasses (classoid-subclasses class1)))
931 (and subclasses (gethash class2 subclasses)))
933 ;; Otherwise, we can't in general be sure that the
934 ;; intersection is empty, since a subclass of both might be
935 ;; defined. But we can eliminate it for some special cases.
936 ((or (structure-classoid-p class1)
937 (structure-classoid-p class2))
938 ;; No subclass of both can be defined.
940 ((eq (classoid-state class1) :sealed)
941 ;; checking whether a subclass of both can be defined:
942 (sealed-class-intersection2 class1 class2))
943 ((eq (classoid-state class2) :sealed)
944 ;; checking whether a subclass of both can be defined:
945 (sealed-class-intersection2 class2 class1))
947 ;; uncertain, since a subclass of both might be defined
950 ;;; KLUDGE: we need this to deal with the special-case INSTANCE and
951 ;;; FUNCALLABLE-INSTANCE types (which used to be CLASSOIDs until CSR
952 ;;; discovered that this was incompatible with the MOP class
953 ;;; hierarchy). See NAMED :COMPLEX-SUBTYPEP-ARG2
954 (defvar *non-instance-classoid-types*
955 '(symbol system-area-pointer weak-pointer code-component
956 lra fdefn random-class))
958 ;;; KLUDGE: we need this because of the need to represent
959 ;;; intersections of two classes, even when empty at a given time, as
960 ;;; uncanonicalized intersections because of the possibility of later
961 ;;; defining a subclass of both classes. The necessity for changing
962 ;;; the default return value from SUBTYPEP to NIL, T if no alternate
963 ;;; method is present comes about because, unlike the other places we
964 ;;; use INVOKE-COMPLEX-SUBTYPEP-ARG1-METHOD, in HAIRY methods and the
965 ;;; like, classes are in their own hierarchy with no possibility of
966 ;;; mixtures with other type classes.
967 (!define-type-method (classoid :complex-subtypep-arg2) (type1 class2)
968 (if (and (intersection-type-p type1)
969 (> (count-if #'classoid-p (intersection-type-types type1)) 1))
971 (invoke-complex-subtypep-arg1-method type1 class2 nil t)))
973 (!define-type-method (classoid :negate) (type)
974 (make-negation-type :type type))
976 (!define-type-method (classoid :unparse) (type)
977 (classoid-proper-name type))
981 ;;; the CLASSOID that we use to represent type information for
982 ;;; STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS. The type system
983 ;;; side does not need to distinguish between STANDARD-CLASS and
984 ;;; FUNCALLABLE-STANDARD-CLASS.
985 (def!struct (standard-classoid (:include classoid)
986 (:constructor make-standard-classoid)))
987 ;;; a metaclass for classes which aren't standardlike but will never
989 (def!struct (static-classoid (:include classoid)
990 (:constructor make-static-classoid)))
992 ;;;; built-in classes
994 ;;; The BUILT-IN-CLASSES list is a data structure which configures the
995 ;;; creation of all the built-in classes. It contains all the info
996 ;;; that we need to maintain the mapping between classes, compile-time
997 ;;; types and run-time type codes. These options are defined:
999 ;;; :TRANSLATION (default none)
1000 ;;; When this class is "parsed" as a type specifier, it is
1001 ;;; translated into the specified internal type representation,
1002 ;;; rather than being left as a class. This is used for types
1003 ;;; which we want to canonicalize to some other kind of type
1004 ;;; object because in general we want to be able to include more
1005 ;;; information than just the class (e.g. for numeric types.)
1007 ;;; :ENUMERABLE (default NIL)
1008 ;;; The value of the :ENUMERABLE slot in the created class.
1009 ;;; Meaningless in translated classes.
1011 ;;; :STATE (default :SEALED)
1012 ;;; The value of CLASS-STATE which we want on completion,
1013 ;;; indicating whether subclasses can be created at run-time.
1015 ;;; :HIERARCHICAL-P (default T unless any of the inherits are non-hierarchical)
1016 ;;; True if we can assign this class a unique inheritance depth.
1018 ;;; :CODES (default none)
1019 ;;; Run-time type codes which should be translated back to this
1020 ;;; class by CLASS-OF. Unspecified for abstract classes.
1022 ;;; :INHERITS (default this class and T)
1023 ;;; The class-precedence list for this class, with this class and
1026 ;;; :DIRECT-SUPERCLASSES (default to head of CPL)
1027 ;;; List of the direct superclasses of this class.
1029 ;;; FIXME: This doesn't seem to be needed after cold init (and so can
1030 ;;; probably be uninterned at the end of cold init).
1031 (defvar *built-in-classes*)
1033 (/show0 "setting *BUILT-IN-CLASSES*")
1036 '((t :state :read-only :translation t)
1037 (character :enumerable t
1038 :codes (#.sb!vm:character-widetag)
1039 :translation (character-set)
1040 :prototype-form (code-char 42))
1041 (symbol :codes (#.sb!vm:symbol-header-widetag)
1042 :prototype-form '#:mu)
1044 (system-area-pointer :codes (#.sb!vm:sap-widetag)
1045 :prototype-form (sb!sys:int-sap 42))
1046 (weak-pointer :codes (#.sb!vm:weak-pointer-widetag)
1047 :prototype-form (sb!ext:make-weak-pointer (find-package "CL")))
1048 (code-component :codes (#.sb!vm:code-header-widetag))
1049 (lra :codes (#.sb!vm:return-pc-header-widetag))
1050 (fdefn :codes (#.sb!vm:fdefn-widetag)
1051 :prototype-form (sb!kernel:make-fdefn "42"))
1052 (random-class) ; used for unknown type codes
1055 :codes (#.sb!vm:closure-header-widetag
1056 #.sb!vm:simple-fun-header-widetag)
1058 :prototype-form (function (lambda () 42)))
1060 (number :translation number)
1062 :translation complex
1064 :codes (#.sb!vm:complex-widetag)
1065 :prototype-form (complex 42 42))
1066 (complex-single-float
1067 :translation (complex single-float)
1068 :inherits (complex number)
1069 :codes (#.sb!vm:complex-single-float-widetag)
1070 :prototype-form (complex 42f0 42f0))
1071 (complex-double-float
1072 :translation (complex double-float)
1073 :inherits (complex number)
1074 :codes (#.sb!vm:complex-double-float-widetag)
1075 :prototype-form (complex 42d0 42d0))
1078 :translation (complex long-float)
1079 :inherits (complex number)
1080 :codes (#.sb!vm:complex-long-float-widetag)
1081 :prototype-form (complex 42l0 42l0))
1082 (real :translation real :inherits (number))
1085 :inherits (real number))
1087 :translation single-float
1088 :inherits (float real number)
1089 :codes (#.sb!vm:single-float-widetag)
1090 :prototype-form 42f0)
1092 :translation double-float
1093 :inherits (float real number)
1094 :codes (#.sb!vm:double-float-widetag)
1095 :prototype-form 42d0)
1098 :translation long-float
1099 :inherits (float real number)
1100 :codes (#.sb!vm:long-float-widetag)
1101 :prototype-form 42l0)
1103 :translation rational
1104 :inherits (real number))
1106 :translation (and rational (not integer))
1107 :inherits (rational real number)
1108 :codes (#.sb!vm:ratio-widetag)
1109 :prototype-form 1/42)
1111 :translation integer
1112 :inherits (rational real number))
1114 :translation (integer #.sb!xc:most-negative-fixnum
1115 #.sb!xc:most-positive-fixnum)
1116 :inherits (integer rational real number)
1117 :codes (#.sb!vm:even-fixnum-lowtag #.sb!vm:odd-fixnum-lowtag)
1120 :translation (and integer (not fixnum))
1121 :inherits (integer rational real number)
1122 :codes (#.sb!vm:bignum-widetag)
1123 :prototype-form (expt 2 #.(* sb!vm:n-word-bits (/ 3 2))))
1125 (array :translation array :codes (#.sb!vm:complex-array-widetag)
1127 :prototype-form (make-array nil :adjustable t))
1129 :translation simple-array :codes (#.sb!vm:simple-array-widetag)
1131 :prototype-form (make-array nil))
1133 :translation (or cons (member nil) vector extended-sequence)
1137 :translation vector :codes (#.sb!vm:complex-vector-widetag)
1138 :direct-superclasses (array sequence)
1139 :inherits (array sequence))
1141 :translation simple-vector :codes (#.sb!vm:simple-vector-widetag)
1142 :direct-superclasses (vector simple-array)
1143 :inherits (vector simple-array array sequence)
1144 :prototype-form (make-array 0))
1146 :translation bit-vector :codes (#.sb!vm:complex-bit-vector-widetag)
1147 :inherits (vector array sequence)
1148 :prototype-form (make-array 0 :element-type 'bit :fill-pointer t))
1150 :translation simple-bit-vector :codes (#.sb!vm:simple-bit-vector-widetag)
1151 :direct-superclasses (bit-vector simple-array)
1152 :inherits (bit-vector vector simple-array
1154 :prototype-form (make-array 0 :element-type 'bit))
1155 (simple-array-unsigned-byte-2
1156 :translation (simple-array (unsigned-byte 2) (*))
1157 :codes (#.sb!vm:simple-array-unsigned-byte-2-widetag)
1158 :direct-superclasses (vector simple-array)
1159 :inherits (vector simple-array array sequence)
1160 :prototype-form (make-array 0 :element-type '(unsigned-byte 2)))
1161 (simple-array-unsigned-byte-4
1162 :translation (simple-array (unsigned-byte 4) (*))
1163 :codes (#.sb!vm:simple-array-unsigned-byte-4-widetag)
1164 :direct-superclasses (vector simple-array)
1165 :inherits (vector simple-array array sequence)
1166 :prototype-form (make-array 0 :element-type '(unsigned-byte 4)))
1167 (simple-array-unsigned-byte-7
1168 :translation (simple-array (unsigned-byte 7) (*))
1169 :codes (#.sb!vm:simple-array-unsigned-byte-7-widetag)
1170 :direct-superclasses (vector simple-array)
1171 :inherits (vector simple-array array sequence)
1172 :prototype-form (make-array 0 :element-type '(unsigned-byte 7)))
1173 (simple-array-unsigned-byte-8
1174 :translation (simple-array (unsigned-byte 8) (*))
1175 :codes (#.sb!vm:simple-array-unsigned-byte-8-widetag)
1176 :direct-superclasses (vector simple-array)
1177 :inherits (vector simple-array array sequence)
1178 :prototype-form (make-array 0 :element-type '(unsigned-byte 8)))
1179 (simple-array-unsigned-byte-15
1180 :translation (simple-array (unsigned-byte 15) (*))
1181 :codes (#.sb!vm:simple-array-unsigned-byte-15-widetag)
1182 :direct-superclasses (vector simple-array)
1183 :inherits (vector simple-array array sequence)
1184 :prototype-form (make-array 0 :element-type '(unsigned-byte 15)))
1185 (simple-array-unsigned-byte-16
1186 :translation (simple-array (unsigned-byte 16) (*))
1187 :codes (#.sb!vm:simple-array-unsigned-byte-16-widetag)
1188 :direct-superclasses (vector simple-array)
1189 :inherits (vector simple-array array sequence)
1190 :prototype-form (make-array 0 :element-type '(unsigned-byte 16)))
1191 #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
1192 (simple-array-unsigned-byte-29
1193 :translation (simple-array (unsigned-byte 29) (*))
1194 :codes (#.sb!vm:simple-array-unsigned-byte-29-widetag)
1195 :direct-superclasses (vector simple-array)
1196 :inherits (vector simple-array array sequence)
1197 :prototype-form (make-array 0 :element-type '(unsigned-byte 29)))
1198 (simple-array-unsigned-byte-31
1199 :translation (simple-array (unsigned-byte 31) (*))
1200 :codes (#.sb!vm:simple-array-unsigned-byte-31-widetag)
1201 :direct-superclasses (vector simple-array)
1202 :inherits (vector simple-array array sequence)
1203 :prototype-form (make-array 0 :element-type '(unsigned-byte 31)))
1204 (simple-array-unsigned-byte-32
1205 :translation (simple-array (unsigned-byte 32) (*))
1206 :codes (#.sb!vm:simple-array-unsigned-byte-32-widetag)
1207 :direct-superclasses (vector simple-array)
1208 :inherits (vector simple-array array sequence)
1209 :prototype-form (make-array 0 :element-type '(unsigned-byte 32)))
1210 #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
1211 (simple-array-unsigned-byte-60
1212 :translation (simple-array (unsigned-byte 60) (*))
1213 :codes (#.sb!vm:simple-array-unsigned-byte-60-widetag)
1214 :direct-superclasses (vector simple-array)
1215 :inherits (vector simple-array array sequence)
1216 :prototype-form (make-array 0 :element-type '(unsigned-byte 60)))
1217 #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
1218 (simple-array-unsigned-byte-63
1219 :translation (simple-array (unsigned-byte 63) (*))
1220 :codes (#.sb!vm:simple-array-unsigned-byte-63-widetag)
1221 :direct-superclasses (vector simple-array)
1222 :inherits (vector simple-array array sequence)
1223 :prototype-form (make-array 0 :element-type '(unsigned-byte 63)))
1224 #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
1225 (simple-array-unsigned-byte-64
1226 :translation (simple-array (unsigned-byte 64) (*))
1227 :codes (#.sb!vm:simple-array-unsigned-byte-64-widetag)
1228 :direct-superclasses (vector simple-array)
1229 :inherits (vector simple-array array sequence)
1230 :prototype-form (make-array 0 :element-type '(unsigned-byte 64)))
1231 (simple-array-signed-byte-8
1232 :translation (simple-array (signed-byte 8) (*))
1233 :codes (#.sb!vm:simple-array-signed-byte-8-widetag)
1234 :direct-superclasses (vector simple-array)
1235 :inherits (vector simple-array array sequence)
1236 :prototype-form (make-array 0 :element-type '(signed-byte 8)))
1237 (simple-array-signed-byte-16
1238 :translation (simple-array (signed-byte 16) (*))
1239 :codes (#.sb!vm:simple-array-signed-byte-16-widetag)
1240 :direct-superclasses (vector simple-array)
1241 :inherits (vector simple-array array sequence)
1242 :prototype-form (make-array 0 :element-type '(signed-byte 16)))
1243 #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
1244 (simple-array-signed-byte-30
1245 :translation (simple-array (signed-byte 30) (*))
1246 :codes (#.sb!vm:simple-array-signed-byte-30-widetag)
1247 :direct-superclasses (vector simple-array)
1248 :inherits (vector simple-array array sequence)
1249 :prototype-form (make-array 0 :element-type '(signed-byte 30)))
1250 (simple-array-signed-byte-32
1251 :translation (simple-array (signed-byte 32) (*))
1252 :codes (#.sb!vm:simple-array-signed-byte-32-widetag)
1253 :direct-superclasses (vector simple-array)
1254 :inherits (vector simple-array array sequence)
1255 :prototype-form (make-array 0 :element-type '(signed-byte 32)))
1256 #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
1257 (simple-array-signed-byte-61
1258 :translation (simple-array (signed-byte 61) (*))
1259 :codes (#.sb!vm:simple-array-signed-byte-61-widetag)
1260 :direct-superclasses (vector simple-array)
1261 :inherits (vector simple-array array sequence)
1262 :prototype-form (make-array 0 :element-type '(signed-byte 61)))
1263 #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
1264 (simple-array-signed-byte-64
1265 :translation (simple-array (signed-byte 64) (*))
1266 :codes (#.sb!vm:simple-array-signed-byte-64-widetag)
1267 :direct-superclasses (vector simple-array)
1268 :inherits (vector simple-array array sequence)
1269 :prototype-form (make-array 0 :element-type '(signed-byte 64)))
1270 (simple-array-single-float
1271 :translation (simple-array single-float (*))
1272 :codes (#.sb!vm:simple-array-single-float-widetag)
1273 :direct-superclasses (vector simple-array)
1274 :inherits (vector simple-array array sequence)
1275 :prototype-form (make-array 0 :element-type 'single-float))
1276 (simple-array-double-float
1277 :translation (simple-array double-float (*))
1278 :codes (#.sb!vm:simple-array-double-float-widetag)
1279 :direct-superclasses (vector simple-array)
1280 :inherits (vector simple-array array sequence)
1281 :prototype-form (make-array 0 :element-type 'double-float))
1283 (simple-array-long-float
1284 :translation (simple-array long-float (*))
1285 :codes (#.sb!vm:simple-array-long-float-widetag)
1286 :direct-superclasses (vector simple-array)
1287 :inherits (vector simple-array array sequence)
1288 :prototype-form (make-array 0 :element-type 'long-float))
1289 (simple-array-complex-single-float
1290 :translation (simple-array (complex single-float) (*))
1291 :codes (#.sb!vm:simple-array-complex-single-float-widetag)
1292 :direct-superclasses (vector simple-array)
1293 :inherits (vector simple-array array sequence)
1294 :prototype-form (make-array 0 :element-type '(complex single-float)))
1295 (simple-array-complex-double-float
1296 :translation (simple-array (complex double-float) (*))
1297 :codes (#.sb!vm:simple-array-complex-double-float-widetag)
1298 :direct-superclasses (vector simple-array)
1299 :inherits (vector simple-array array sequence)
1300 :prototype-form (make-array 0 :element-type '(complex double-float)))
1302 (simple-array-complex-long-float
1303 :translation (simple-array (complex long-float) (*))
1304 :codes (#.sb!vm:simple-array-complex-long-float-widetag)
1305 :direct-superclasses (vector simple-array)
1306 :inherits (vector simple-array array sequence)
1307 :prototype-form (make-array 0 :element-type '(complex long-float)))
1310 :direct-superclasses (vector)
1311 :inherits (vector array sequence))
1313 :translation simple-string
1314 :direct-superclasses (string simple-array)
1315 :inherits (string vector simple-array array sequence))
1317 :translation (vector nil)
1318 :codes (#.sb!vm:complex-vector-nil-widetag)
1319 :direct-superclasses (string)
1320 :inherits (string vector array sequence)
1321 :prototype-form (make-array 0 :element-type 'nil :fill-pointer t))
1323 :translation (simple-array nil (*))
1324 :codes (#.sb!vm:simple-array-nil-widetag)
1325 :direct-superclasses (vector-nil simple-string)
1326 :inherits (vector-nil simple-string string vector simple-array
1328 :prototype-form (make-array 0 :element-type 'nil))
1330 :translation base-string
1331 :codes (#.sb!vm:complex-base-string-widetag)
1332 :direct-superclasses (string)
1333 :inherits (string vector array sequence)
1334 :prototype-form (make-array 0 :element-type 'base-char :fill-pointer t))
1336 :translation simple-base-string
1337 :codes (#.sb!vm:simple-base-string-widetag)
1338 :direct-superclasses (base-string simple-string)
1339 :inherits (base-string simple-string string vector simple-array
1341 :prototype-form (make-array 0 :element-type 'base-char))
1344 :translation (vector character)
1345 :codes (#.sb!vm:complex-character-string-widetag)
1346 :direct-superclasses (string)
1347 :inherits (string vector array sequence)
1348 :prototype-form (make-array 0 :element-type 'character :fill-pointer t))
1350 (simple-character-string
1351 :translation (simple-array character (*))
1352 :codes (#.sb!vm:simple-character-string-widetag)
1353 :direct-superclasses (character-string simple-string)
1354 :inherits (character-string simple-string string vector simple-array
1356 :prototype-form (make-array 0 :element-type 'character))
1358 :translation (or cons (member nil))
1359 :inherits (sequence))
1361 :codes (#.sb!vm:list-pointer-lowtag)
1363 :inherits (list sequence)
1364 :prototype-form (cons nil nil))
1366 :translation (member nil)
1367 :inherits (symbol list sequence)
1368 :direct-superclasses (symbol list)
1369 :prototype-form 'nil)
1380 :inherits (stream)))))
1382 ;;; See also src/code/class-init.lisp where we finish setting up the
1383 ;;; translations for built-in types.
1385 (dolist (x *built-in-classes*)
1386 #-sb-xc-host (/show0 "at head of loop over *BUILT-IN-CLASSES*")
1389 (translation nil trans-p)
1396 (hierarchical-p t) ; might be modified below
1397 (direct-superclasses (if inherits
1398 (list (car inherits))
1401 (declare (ignore codes state translation prototype-form))
1402 (let ((inherits-list (if (eq name t)
1404 (cons t (reverse inherits))))
1405 (classoid (make-built-in-classoid
1406 :enumerable enumerable
1408 :translation (if trans-p :initializing nil)
1409 :direct-superclasses
1412 (mapcar #'find-classoid direct-superclasses)))))
1413 (setf (info :type :kind name) #+sb-xc-host :defined #-sb-xc-host :primitive
1414 (classoid-cell-classoid (find-classoid-cell name :create t)) classoid)
1416 (setf (info :type :builtin name) classoid))
1417 (let* ((inherits-vector
1421 (classoid-layout (find-classoid x))))
1422 (when (minusp (layout-depthoid super-layout))
1423 (setf hierarchical-p nil))
1426 (depthoid (if hierarchical-p
1427 (or depth (length inherits-vector))
1430 (find-and-init-or-check-layout name
1435 :invalidate nil)))))
1436 (/show0 "done with loop over *BUILT-IN-CLASSES*"))
1438 ;;; Define temporary PCL STANDARD-CLASSes. These will be set up
1439 ;;; correctly and the Lisp layout replaced by a PCL wrapper after PCL
1440 ;;; is loaded and the class defined.
1442 (/show0 "about to define temporary STANDARD-CLASSes")
1443 (dolist (x '(;; Why is STREAM duplicated in this list? Because, when
1444 ;; the inherits-vector of FUNDAMENTAL-STREAM is set up,
1445 ;; a vector containing the elements of the list below,
1446 ;; i.e. '(T STREAM STREAM), is created, and
1447 ;; this is what the function ORDER-LAYOUT-INHERITS
1450 ;; So, the purpose is to guarantee a valid layout for
1451 ;; the FUNDAMENTAL-STREAM class, matching what
1452 ;; ORDER-LAYOUT-INHERITS would do.
1453 ;; ORDER-LAYOUT-INHERITS would place STREAM at index 2
1454 ;; in the INHERITS(-VECTOR). Index 1 would not be
1455 ;; filled, so STREAM is duplicated there (as
1456 ;; ORDER-LAYOUTS-INHERITS would do). Maybe the
1457 ;; duplicate definition could be removed (removing a
1458 ;; STREAM element), because FUNDAMENTAL-STREAM is
1459 ;; redefined after PCL is set up, anyway. But to play
1460 ;; it safely, we define the class with a valid INHERITS
1462 (fundamental-stream (t stream stream))))
1463 (/show0 "defining temporary STANDARD-CLASS")
1464 (let* ((name (first x))
1465 (inherits-list (second x))
1466 (classoid (make-standard-classoid :name name))
1467 (classoid-cell (find-classoid-cell name :create t)))
1468 ;; Needed to open-code the MAP, below
1469 (declare (type list inherits-list))
1470 (setf (classoid-cell-classoid classoid-cell) classoid
1471 (info :type :kind name) :instance)
1472 (let ((inherits (map 'simple-vector
1474 (classoid-layout (find-classoid x)))
1476 #-sb-xc-host (/show0 "INHERITS=..") #-sb-xc-host (/hexstr inherits)
1477 (register-layout (find-and-init-or-check-layout name 0 inherits -1 0)
1479 (/show0 "done defining temporary STANDARD-CLASSes"))
1481 ;;; Now that we have set up the class heterarchy, seal the sealed
1482 ;;; classes. This must be done after the subclasses have been set up.
1484 (dolist (x *built-in-classes*)
1485 (destructuring-bind (name &key (state :sealed) &allow-other-keys) x
1486 (setf (classoid-state (find-classoid name)) state))))
1488 ;;;; class definition/redefinition
1490 ;;; This is to be called whenever we are altering a class.
1491 (defun %modify-classoid (classoid)
1493 (when (member (classoid-state classoid) '(:read-only :frozen))
1494 ;; FIXME: This should probably be CERROR.
1495 (warn "making ~(~A~) class ~S writable"
1496 (classoid-state classoid)
1497 (classoid-name classoid))
1498 (setf (classoid-state classoid) nil)))
1500 ;;; Mark LAYOUT as invalid. Setting DEPTHOID -1 helps cause unsafe
1501 ;;; structure type tests to fail. Remove class from all superclasses
1502 ;;; too (might not be registered, so might not be in subclasses of the
1503 ;;; nominal superclasses.) We set the layout-clos-hash slots to 0 to
1504 ;;; invalidate the wrappers for specialized dispatch functions, which
1505 ;;; use those slots as indexes into tables.
1506 (defun %invalidate-layout (layout)
1507 (declare (type layout layout))
1508 (setf (layout-invalid layout) t
1509 (layout-depthoid layout) -1)
1510 (setf (layout-clos-hash layout) 0)
1511 (let ((inherits (layout-inherits layout))
1512 (classoid (layout-classoid layout)))
1513 (%modify-classoid classoid)
1514 (dovector (super inherits)
1515 (let ((subs (classoid-subclasses (layout-classoid super))))
1517 (remhash classoid subs)))))
1520 ;;;; cold loading initializations
1522 ;;; FIXME: It would be good to arrange for this to be called when the
1523 ;;; cross-compiler is being built, not just when the target Lisp is
1524 ;;; being cold loaded. Perhaps this could be moved to its own file
1525 ;;; late in the build-order.lisp-expr sequence, and be put in
1526 ;;; !COLD-INIT-FORMS there?
1527 (defun !class-finalize ()
1528 (dohash ((name layout) *forward-referenced-layouts*)
1529 (let ((class (find-classoid name nil)))
1531 (setf (layout-classoid layout) (make-undefined-classoid name)))
1532 ((eq (classoid-layout class) layout)
1533 (remhash name *forward-referenced-layouts*))
1535 (error "Something strange with forward layout for ~S:~% ~S"
1539 #-sb-xc-host (/show0 "about to set *BUILT-IN-CLASS-CODES*")
1540 (setq *built-in-class-codes*
1541 (let* ((initial-element
1543 ;; KLUDGE: There's a FIND-CLASSOID DEFTRANSFORM for
1544 ;; constant class names which creates fast but
1545 ;; non-cold-loadable, non-compact code. In this
1546 ;; context, we'd rather have compact, cold-loadable
1547 ;; code. -- WHN 19990928
1548 (declare (notinline find-classoid))
1549 (classoid-layout (find-classoid 'random-class))))
1550 (res (make-array 256 :initial-element initial-element)))
1551 (dolist (x *built-in-classes* res)
1552 (destructuring-bind (name &key codes &allow-other-keys)
1554 (let ((layout (classoid-layout (find-classoid name))))
1555 (dolist (code codes)
1556 (setf (svref res code) layout)))))))
1557 (setq *null-classoid-layout*
1558 ;; KLUDGE: we use (LET () ...) instead of a LOCALLY here to
1559 ;; work around a bug in the LOCALLY handling in the fopcompiler
1560 ;; (present in 0.9.13-0.9.14.18). -- JES, 2006-07-16
1562 (declare (notinline find-classoid))
1563 (classoid-layout (find-classoid 'null))))
1564 #-sb-xc-host (/show0 "done setting *BUILT-IN-CLASS-CODES*"))
1566 (!defun-from-collected-cold-init-forms !classes-cold-init)