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 (setq *forward-referenced-layouts
* (make-hash-table :test
'equal
))
106 (/show0
"processing *!INITIAL-LAYOUTS*")
107 (dolist (x *!initial-layouts
*)
108 (setf (gethash (car x
) *forward-referenced-layouts
*)
110 (/show0
"done processing *!INITIAL-LAYOUTS*")))
112 ;;; The LAYOUT structure is pointed to by the first cell of instance
113 ;;; (or structure) objects. It represents what we need to know for
114 ;;; type checking and garbage collection. Whenever a class is
115 ;;; incompatibly redefined, a new layout is allocated. If two object's
116 ;;; layouts are EQ, then they are exactly the same type.
118 ;;; *** IMPORTANT ***
120 ;;; If you change the slots of LAYOUT, you need to alter genesis as
121 ;;; well, since the initialization of layout slots is hardcoded there.
123 ;;; FIXME: ...it would be better to automate this, of course...
125 ;; KLUDGE: A special hack keeps this from being
126 ;; called when building code for the
127 ;; cross-compiler. See comments at the DEFUN for
128 ;; this. -- WHN 19990914
129 (:make-load-form-fun
#-sb-xc-host ignore-it
130 ;; KLUDGE: DEF!STRUCT at #+SB-XC-HOST
131 ;; time controls both the
132 ;; build-the-cross-compiler behavior
133 ;; and the run-the-cross-compiler
134 ;; behavior. The value below only
135 ;; works for build-the-cross-compiler.
136 ;; There's a special hack in
137 ;; EMIT-MAKE-LOAD-FORM which gives
138 ;; effectively IGNORE-IT behavior for
139 ;; LAYOUT at run-the-cross-compiler
140 ;; time. It would be cleaner to
141 ;; actually have an IGNORE-IT value
142 ;; stored, but it's hard to see how to
143 ;; do that concisely with the current
144 ;; DEF!STRUCT setup. -- WHN 19990930
146 make-load-form-for-layout
))
147 ;; a pseudo-random hash value for use by CLOS. KLUDGE: The fact
148 ;; that this slot is at offset 1 is known to GENESIS.
149 (clos-hash (random-layout-clos-hash) :type layout-clos-hash
)
150 ;; the class that this is a layout for
151 (classoid (missing-arg) :type classoid
)
152 ;; The value of this slot can be:
153 ;; * :UNINITIALIZED if not initialized yet;
154 ;; * NIL if this is the up-to-date layout for a class; or
155 ;; * T if this layout has been invalidated (by being replaced by
156 ;; a new, more-up-to-date LAYOUT).
157 ;; * something else (probably a list) if the class is a PCL wrapper
158 ;; and PCL has made it invalid and made a note to itself about it
159 (invalid :uninitialized
:type
(or cons
(member nil t
:uninitialized
)))
160 ;; the layouts for all classes we inherit. If hierarchical, i.e. if
161 ;; DEPTHOID >= 0, then these are ordered by ORDER-LAYOUT-INHERITS
162 ;; (least to most specific), so that each inherited layout appears
163 ;; at its expected depth, i.e. at its LAYOUT-DEPTHOID value.
165 ;; Remaining elements are filled by the non-hierarchical layouts or,
166 ;; if they would otherwise be empty, by copies of succeeding layouts.
167 (inherits #() :type simple-vector
)
168 ;; If inheritance is not hierarchical, this is -1. If inheritance is
169 ;; hierarchical, this is the inheritance depth, i.e. (LENGTH INHERITS).
171 ;; (1) This turns out to be a handy encoding for arithmetically
172 ;; comparing deepness; it is generally useful to do a bare numeric
173 ;; comparison of these depthoid values, and we hardly ever need to
174 ;; test whether the values are negative or not.
175 ;; (2) This was called INHERITANCE-DEPTH in classic CMU CL. It was
176 ;; renamed because some of us find it confusing to call something
177 ;; a depth when it isn't quite.
178 (depthoid -
1 :type layout-depthoid
)
179 ;; the number of top level descriptor cells in each instance
180 (length 0 :type index
)
181 ;; If this layout has some kind of compiler meta-info, then this is
182 ;; it. If a structure, then we store the DEFSTRUCT-DESCRIPTION here.
184 ;; This is true if objects of this class are never modified to
185 ;; contain dynamic pointers in their slots or constant-like
186 ;; substructure (and hence can be copied into read-only space by
189 ;; This slot is known to the C runtime support code.
190 (pure nil
:type
(member t nil
0))
191 ;; Number of raw words at the end.
192 ;; This slot is known to the C runtime support code.
193 (n-untagged-slots 0 :type index
)
194 ;; Definition location
195 (source-location nil
)
196 ;; Information about slots in the class to PCL: this provides fast
197 ;; access to slot-definitions and locations by name, etc.
198 (slot-table #(nil) :type simple-vector
)
199 ;; True IFF the layout belongs to a standand-instance or a
200 ;; standard-funcallable-instance -- that is, true only if the layout
201 ;; is really a wrapper.
203 ;; FIXME: If we unify wrappers and layouts this can go away, since
204 ;; it is only used in SB-PCL::EMIT-FETCH-WRAPPERS, which can then
205 ;; use INSTANCE-SLOTS-LAYOUT instead (if there is are no slot
206 ;; layouts, there are no slots for it to pull.)
207 (for-std-class-p nil
:type boolean
:read-only t
))
209 (def!method print-object
((layout layout
) stream
)
210 (print-unreadable-object (layout stream
:type t
:identity t
)
212 "for ~S~@[, INVALID=~S~]"
213 (layout-proper-name layout
)
214 (layout-invalid layout
))))
216 (eval-when (#-sb-xc
:compile-toplevel
:load-toplevel
:execute
)
217 (defun layout-proper-name (layout)
218 (classoid-proper-name (layout-classoid layout
))))
220 ;;;; support for the hash values used by CLOS when working with LAYOUTs
222 ;;; a generator for random values suitable for the CLOS-HASH slots of
223 ;;; LAYOUTs. We use our own RANDOM-STATE here because we'd like
224 ;;; pseudo-random values to come the same way in the target even when
225 ;;; we make minor changes to the system, in order to reduce the
226 ;;; mysteriousness of possible CLOS bugs.
227 (defvar *layout-clos-hash-random-state
*)
228 (defun random-layout-clos-hash ()
229 ;; FIXME: I'm not sure why this expression is (1+ (RANDOM FOO)),
230 ;; returning a strictly positive value. I copied it verbatim from
231 ;; CMU CL INITIALIZE-LAYOUT-HASH, so presumably it works, but I
232 ;; dunno whether the hash values are really supposed to be 1-based.
233 ;; They're declared as INDEX.. Or is this a hack to try to avoid
234 ;; having to use bignum arithmetic? Or what? An explanation would be
237 ;; an explanation is provided in Kiczales and Rodriguez, "Efficient
238 ;; Method Dispatch in PCL", 1990. -- CSR, 2005-11-30
239 (1+ (random (1- layout-clos-hash-limit
)
240 (if (boundp '*layout-clos-hash-random-state
*)
241 *layout-clos-hash-random-state
*
242 (setf *layout-clos-hash-random-state
*
243 (make-random-state))))))
245 ;;; If we can't find any existing layout, then we create a new one
246 ;;; storing it in *FORWARD-REFERENCED-LAYOUTS*. In classic CMU CL, we
247 ;;; used to immediately check for compatibility, but for
248 ;;; cross-compilability reasons (i.e. convenience of using this
249 ;;; function in a MAKE-LOAD-FORM expression) that functionality has
250 ;;; been split off into INIT-OR-CHECK-LAYOUT.
251 (declaim (ftype (sfunction (symbol) layout
) find-layout
))
252 (defun find-layout (name)
253 ;; This seems to be currently used only from the compiler, but make
254 ;; it thread-safe all the same. We need to lock *F-R-L* before doing
255 ;; FIND-CLASSOID in case (SETF FIND-CLASSOID) happens in parallel.
256 (let ((table *forward-referenced-layouts
*))
257 (with-locked-hash-table (table)
258 (let ((classoid (find-classoid name nil
)))
259 (or (and classoid
(classoid-layout classoid
))
261 (setf (gethash name table
)
262 (make-layout :classoid
(or classoid
(make-undefined-classoid name
)))))))))
264 ;;; If LAYOUT is uninitialized, initialize it with CLASSOID, LENGTH,
265 ;;; INHERITS, and DEPTHOID, otherwise require that it be consistent
266 ;;; with CLASSOID, LENGTH, INHERITS, and DEPTHOID.
268 ;;; UNDEFINED-CLASS values are interpreted specially as "we don't know
269 ;;; anything about the class", so if LAYOUT is initialized, any
270 ;;; preexisting class slot value is OK, and if it's not initialized,
271 ;;; its class slot value is set to an UNDEFINED-CLASS. -- FIXME: This
272 ;;; is no longer true, :UNINITIALIZED used instead.
273 (declaim (ftype (function (layout classoid index simple-vector layout-depthoid
276 init-or-check-layout
))
277 (defun init-or-check-layout
278 (layout classoid length inherits depthoid nuntagged
)
279 (cond ((eq (layout-invalid layout
) :uninitialized
)
280 ;; There was no layout before, we just created one which
281 ;; we'll now initialize with our information.
282 (setf (layout-length layout
) length
283 (layout-inherits layout
) inherits
284 (layout-depthoid layout
) depthoid
285 (layout-n-untagged-slots layout
) nuntagged
286 (layout-classoid layout
) classoid
287 (layout-invalid layout
) nil
))
288 ;; FIXME: Now that LAYOUTs are born :UNINITIALIZED, maybe this
289 ;; clause is not needed?
290 ((not *type-system-initialized
*)
291 (setf (layout-classoid layout
) classoid
))
293 ;; There was an old layout already initialized with old
294 ;; information, and we'll now check that old information
295 ;; which was known with certainty is consistent with current
296 ;; information which is known with certainty.
297 (check-layout layout classoid length inherits depthoid nuntagged
)))
300 ;;; In code for the target Lisp, we don't use dump LAYOUTs using the
301 ;;; standard load form mechanism, we use special fops instead, in
302 ;;; order to make cold load come out right. But when we're building
303 ;;; the cross-compiler, we can't do that because we don't have access
304 ;;; to special non-ANSI low-level things like special fops, and we
305 ;;; don't need to do that anyway because our code isn't going to be
306 ;;; cold loaded, so we use the ordinary load form system.
308 ;;; KLUDGE: A special hack causes this not to be called when we are
309 ;;; building code for the target Lisp. It would be tidier to just not
310 ;;; have it in place when we're building the target Lisp, but it
311 ;;; wasn't clear how to do that without rethinking DEF!STRUCT quite a
312 ;;; bit, so I punted. -- WHN 19990914
314 (defun make-load-form-for-layout (layout &optional env
)
315 (declare (type layout layout
))
316 (declare (ignore env
))
317 (when (layout-invalid layout
)
318 (compiler-error "can't dump reference to obsolete class: ~S"
319 (layout-classoid layout
)))
320 (let ((name (classoid-name (layout-classoid layout
))))
322 (compiler-error "can't dump anonymous LAYOUT: ~S" layout
))
323 ;; Since LAYOUT refers to a class which refers back to the LAYOUT,
324 ;; we have to do this in two stages, like the TREE-WITH-PARENT
325 ;; example in the MAKE-LOAD-FORM entry in the ANSI spec.
327 ;; "creation" form (which actually doesn't create a new LAYOUT if
328 ;; there's a preexisting one with this name)
329 `(find-layout ',name
)
330 ;; "initialization" form (which actually doesn't initialize
331 ;; preexisting LAYOUTs, just checks that they're consistent).
332 `(init-or-check-layout ',layout
333 ',(layout-classoid layout
)
334 ',(layout-length layout
)
335 ',(layout-inherits layout
)
336 ',(layout-depthoid layout
)
337 ',(layout-n-untagged-slots 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
348 redefine-layout-warning
))
349 (defun redefine-layout-warning (old-context old-layout
350 context length inherits depthoid nuntagged
)
351 (declare (type layout old-layout
) (type simple-string old-context context
))
352 (let ((name (layout-proper-name old-layout
)))
353 (or (let ((old-inherits (layout-inherits old-layout
)))
354 (or (when (mismatch old-inherits
356 :key
#'layout-proper-name
)
357 (warn "change in superclasses of class ~S:~% ~
358 ~A superclasses: ~S~% ~
362 (map 'list
#'layout-proper-name old-inherits
)
364 (map 'list
#'layout-proper-name inherits
))
366 (let ((diff (mismatch old-inherits inherits
)))
370 ~:(~A~) definition of superclass ~S is incompatible with~% ~
374 (layout-proper-name (svref old-inherits diff
))
377 (let ((old-length (layout-length old-layout
)))
378 (unless (= old-length length
)
379 (warn "change in instance length of class ~S:~% ~
383 old-context old-length
386 (let ((old-nuntagged (layout-n-untagged-slots old-layout
)))
387 (unless (= old-nuntagged nuntagged
)
388 (warn "change in instance layout of class ~S:~% ~
389 ~A untagged slots: ~W~% ~
390 ~A untagged slots: ~W"
392 old-context old-nuntagged
395 (unless (= (layout-depthoid old-layout
) depthoid
)
396 (warn "change in the inheritance structure of class ~S~% ~
397 between the ~A definition and the ~A definition"
398 name old-context context
)
401 ;;; Require that LAYOUT data be consistent with CLASS, LENGTH,
402 ;;; INHERITS, and DEPTHOID.
403 (declaim (ftype (function
404 (layout classoid index simple-vector layout-depthoid index
))
406 (defun check-layout (layout classoid length inherits depthoid nuntagged
)
407 (aver (eq (layout-classoid layout
) classoid
))
408 (when (redefine-layout-warning "current" layout
409 "compile time" length inherits depthoid
411 ;; Classic CMU CL had more options here. There are several reasons
412 ;; why they might want more options which are less appropriate for
413 ;; us: (1) It's hard to fit the classic CMU CL flexible approach
414 ;; into the ANSI-style MAKE-LOAD-FORM system, and having a
415 ;; non-MAKE-LOAD-FORM-style system is painful when we're trying to
416 ;; make the cross-compiler run under vanilla ANSI Common Lisp. (2)
417 ;; We have CLOS now, and if you want to be able to flexibly
418 ;; redefine classes without restarting the system, it'd make sense
419 ;; to use that, so supporting complexity in order to allow
420 ;; modifying DEFSTRUCTs without restarting the system is a low
421 ;; priority. (3) We now have the ability to rebuild the SBCL
422 ;; system from scratch, so we no longer need this functionality in
423 ;; order to maintain the SBCL system by modifying running images.
424 (error "The class ~S was not changed, and there's no guarantee that~@
425 the loaded code (which expected another layout) will work."
426 (layout-proper-name layout
)))
429 ;;; a common idiom (the same as CMU CL FIND-LAYOUT) rolled up into a
430 ;;; single function call
432 ;;; Used by the loader to forward-reference layouts for classes whose
433 ;;; definitions may not have been loaded yet. This allows type tests
434 ;;; to be loaded when the type definition hasn't been loaded yet.
435 (declaim (ftype (function (symbol index simple-vector layout-depthoid index
)
437 find-and-init-or-check-layout
))
438 (defun find-and-init-or-check-layout (name length inherits depthoid nuntagged
)
439 (let ((layout (find-layout name
)))
440 (init-or-check-layout layout
441 (or (find-classoid name nil
)
442 (layout-classoid layout
))
448 ;;; Record LAYOUT as the layout for its class, adding it as a subtype
449 ;;; of all superclasses. This is the operation that "installs" a
450 ;;; layout for a class in the type system, clobbering any old layout.
451 ;;; However, this does not modify the class namespace; that is a
452 ;;; separate operation (think anonymous classes.)
453 ;;; -- If INVALIDATE, then all the layouts for any old definition
454 ;;; and subclasses are invalidated, and the SUBCLASSES slot is cleared.
455 ;;; -- If DESTRUCT-LAYOUT, then this is some old layout, and is to be
456 ;;; destructively modified to hold the same type information.
457 (eval-when (#-sb-xc
:compile-toplevel
:load-toplevel
:execute
)
458 (defun register-layout (layout &key
(invalidate t
) destruct-layout
)
459 (declare (type layout layout
) (type (or layout null
) destruct-layout
))
460 (let* ((classoid (layout-classoid layout
))
461 (classoid-layout (classoid-layout classoid
))
462 (subclasses (classoid-subclasses classoid
)))
464 ;; Attempting to register ourselves with a temporary undefined
465 ;; class placeholder is almost certainly a programmer error. (I
466 ;; should know, I did it.) -- WHN 19990927
467 (aver (not (undefined-classoid-p classoid
)))
469 ;; This assertion dates from classic CMU CL. The rationale is
470 ;; probably that calling REGISTER-LAYOUT more than once for the
471 ;; same LAYOUT is almost certainly a programmer error.
472 (aver (not (eq classoid-layout layout
)))
474 ;; Figure out what classes are affected by the change, and issue
475 ;; appropriate warnings and invalidations.
476 (when classoid-layout
477 (modify-classoid classoid
)
479 (dohash ((subclass subclass-layout
) subclasses
:locked t
)
480 (modify-classoid subclass
)
482 (invalidate-layout subclass-layout
))))
484 (invalidate-layout classoid-layout
)
485 (setf (classoid-subclasses classoid
) nil
)))
488 (setf (layout-invalid destruct-layout
) nil
489 (layout-inherits destruct-layout
) (layout-inherits layout
)
490 (layout-depthoid destruct-layout
)(layout-depthoid layout
)
491 (layout-length destruct-layout
) (layout-length layout
)
492 (layout-n-untagged-slots destruct-layout
) (layout-n-untagged-slots layout
)
493 (layout-info destruct-layout
) (layout-info layout
)
494 (classoid-layout classoid
) destruct-layout
)
495 (setf (layout-invalid layout
) nil
496 (classoid-layout classoid
) layout
))
498 (dovector (super-layout (layout-inherits layout
))
499 (let* ((super (layout-classoid super-layout
))
500 (subclasses (or (classoid-subclasses super
)
501 (setf (classoid-subclasses super
)
502 (make-hash-table :test
'eq
503 #-sb-xc-host
#-sb-xc-host
505 (when (and (eq (classoid-state super
) :sealed
)
506 (not (gethash classoid subclasses
)))
507 (warn "unsealing sealed class ~S in order to subclass it"
508 (classoid-name super
))
509 (setf (classoid-state super
) :read-only
))
510 (setf (gethash classoid subclasses
)
511 (or destruct-layout layout
)))))
516 ;;; Arrange the inherited layouts to appear at their expected depth,
517 ;;; ensuring that hierarchical type tests succeed. Layouts with
518 ;;; DEPTHOID >= 0 (i.e. hierarchical classes) are placed first,
519 ;;; at exactly that index in the INHERITS vector. Then, non-hierarchical
520 ;;; layouts are placed in remaining elements. Then, any still-empty
521 ;;; elements are filled with their successors, ensuring that each
522 ;;; element contains a valid layout.
524 ;;; This reordering may destroy CPL ordering, so the inherits should
525 ;;; not be read as being in CPL order.
526 (defun order-layout-inherits (layouts)
527 (declare (simple-vector layouts
))
528 (let ((length (length layouts
))
531 (let ((depth (layout-depthoid (svref layouts i
))))
532 (when (> depth max-depth
)
533 (setf max-depth depth
))))
534 (let* ((new-length (max (1+ max-depth
) length
))
535 ;; KLUDGE: 0 here is the "uninitialized" element. We need
536 ;; to specify it explicitly for portability purposes, as
537 ;; elements can be read before being set [ see below, "(EQL
538 ;; OLD-LAYOUT 0)" ]. -- CSR, 2002-04-20
539 (inherits (make-array new-length
:initial-element
0)))
541 (let* ((layout (svref layouts i
))
542 (depth (layout-depthoid layout
)))
543 (unless (eql depth -
1)
544 (let ((old-layout (svref inherits depth
)))
545 (unless (or (eql old-layout
0) (eq old-layout layout
))
546 (error "layout depth conflict: ~S~%" layouts
)))
547 (setf (svref inherits depth
) layout
))))
551 (declare (type index i j
))
552 (let* ((layout (svref layouts i
))
553 (depth (layout-depthoid layout
)))
555 (loop (when (eql (svref inherits j
) 0)
558 (setf (svref inherits j
) layout
))))
559 (do ((i (1- new-length
) (1- i
)))
561 (declare (type fixnum i
))
562 (when (eql (svref inherits i
) 0)
563 (setf (svref inherits i
) (svref inherits
(1+ i
)))))
566 ;;;; class precedence lists
568 ;;; Topologically sort the list of objects to meet a set of ordering
569 ;;; constraints given by pairs (A . B) constraining A to precede B.
570 ;;; When there are multiple objects to choose, the tie-breaker
571 ;;; function is called with both the list of object to choose from and
572 ;;; the reverse ordering built so far.
573 (defun topological-sort (objects constraints tie-breaker
)
574 (declare (list objects constraints
)
575 (function tie-breaker
))
576 (let ((obj-info (make-hash-table :size
(length objects
)))
579 (dolist (constraint constraints
)
580 (let ((obj1 (car constraint
))
581 (obj2 (cdr constraint
)))
582 (let ((info2 (gethash obj2 obj-info
)))
585 (setf (gethash obj2 obj-info
) (list 1))))
586 (let ((info1 (gethash obj1 obj-info
)))
588 (push obj2
(rest info1
))
589 (setf (gethash obj1 obj-info
) (list 0 obj2
))))))
590 (dolist (obj objects
)
591 (let ((info (gethash obj obj-info
)))
592 (when (or (not info
) (zerop (first info
)))
593 (push obj free-objs
))))
595 (flet ((next-result (obj)
597 (dolist (successor (rest (gethash obj obj-info
)))
598 (let* ((successor-info (gethash successor obj-info
))
599 (count (1- (first successor-info
))))
600 (setf (first successor-info
) count
)
602 (push successor free-objs
))))))
603 (cond ((endp free-objs
)
604 (dohash ((obj info
) obj-info
)
605 (unless (zerop (first info
))
606 (error "Topological sort failed due to constraint on ~S."
608 (return (nreverse result
)))
609 ((endp (rest free-objs
))
610 (next-result (pop free-objs
)))
612 (let ((obj (funcall tie-breaker free-objs result
)))
613 (setf free-objs
(remove obj free-objs
))
614 (next-result obj
))))))))
617 ;;; standard class precedence list computation
618 (defun std-compute-class-precedence-list (class)
621 (labels ((note-class (class)
622 (unless (member class classes
)
624 (let ((superclasses (classoid-direct-superclasses class
)))
626 (rest superclasses
(rest rest
)))
628 (let ((next (first rest
)))
629 (push (cons prev next
) constraints
)
631 (dolist (class superclasses
)
632 (note-class class
)))))
633 (std-cpl-tie-breaker (free-classes rev-cpl
)
634 (dolist (class rev-cpl
(first free-classes
))
635 (let* ((superclasses (classoid-direct-superclasses class
))
636 (intersection (intersection free-classes
639 (return (first intersection
)))))))
641 (topological-sort classes constraints
#'std-cpl-tie-breaker
))))
643 ;;;; object types to represent classes
645 ;;; An UNDEFINED-CLASSOID is a cookie we make up to stick in forward
646 ;;; referenced layouts. Users should never see them.
647 (def!struct
(undefined-classoid
649 (:constructor make-undefined-classoid
(name))))
651 ;;; BUILT-IN-CLASS is used to represent the standard classes that
652 ;;; aren't defined with DEFSTRUCT and other specially implemented
653 ;;; primitive types whose only attribute is their name.
655 ;;; Some BUILT-IN-CLASSes have a TRANSLATION, which means that they
656 ;;; are effectively DEFTYPE'd to some other type (usually a union of
657 ;;; other classes or a "primitive" type such as NUMBER, ARRAY, etc.)
658 ;;; This translation is done when type specifiers are parsed. Type
659 ;;; system operations (union, subtypep, etc.) should never encounter
660 ;;; translated classes, only their translation.
661 (def!struct
(built-in-classoid (:include classoid
)
662 (:constructor make-built-in-classoid
))
663 ;; the type we translate to on parsing. If NIL, then this class
664 ;; stands on its own; or it can be set to :INITIALIZING for a period
666 (translation nil
:type
(or ctype
(member nil
:initializing
))))
668 ;;; STRUCTURE-CLASS represents what we need to know about structure
669 ;;; classes. Non-structure "typed" defstructs are a special case, and
670 ;;; don't have a corresponding class.
671 (def!struct
(structure-classoid (:include classoid
)
672 (:constructor make-structure-classoid
))
673 ;; If true, a default keyword constructor for this structure.
674 (constructor nil
:type
(or function null
)))
676 ;;;; classoid namespace
678 ;;; We use an indirection to allow forward referencing of class
679 ;;; definitions with load-time resolution.
680 (def!struct
(classoid-cell
681 (:constructor make-classoid-cell
(name &optional classoid
))
682 (:make-load-form-fun
(lambda (c)
684 ',(classoid-cell-name c
)
686 #-no-ansi-print-object
687 (:print-object
(lambda (s stream
)
688 (print-unreadable-object (s stream
:type t
)
689 (prin1 (classoid-cell-name s
) stream
)))))
690 ;; Name of class we expect to find.
691 (name nil
:type symbol
:read-only t
)
692 ;; Classoid or NIL if not yet defined.
693 (classoid nil
:type
(or classoid null
))
697 (defvar *classoid-cells
*)
699 (setq *classoid-cells
* (make-hash-table :test
'eq
)))
701 (defun find-classoid-cell (name &key create errorp
)
702 (let ((table *classoid-cells
*)
703 (real-name (uncross name
)))
704 (or (with-locked-hash-table (table)
705 (or (gethash real-name table
)
707 (setf (gethash real-name table
) (make-classoid-cell real-name
)))))
709 (error 'simple-type-error
711 :expected-type
'class
712 :format-control
"Class not yet defined: ~S"
713 :format-arguments
(list name
))))))
715 (eval-when (#-sb-xc
:compile-toplevel
:load-toplevel
:execute
)
717 ;; Return the classoid with the specified NAME. If ERRORP is false,
718 ;; then NIL is returned when no such class exists."
719 (defun find-classoid (name &optional
(errorp t
))
720 (declare (type symbol name
))
721 (let ((cell (find-classoid-cell name
:errorp errorp
)))
722 (when cell
(classoid-cell-classoid cell
))))
724 ;; This is definitely not thread safe with itself -- but should be
725 ;; OK with parallel FIND-CLASSOID & FIND-LAYOUT.
726 (defun (setf find-classoid
) (new-value name
)
727 #-sb-xc
(declare (type (or null classoid
) new-value
))
729 (let ((table *forward-referenced-layouts
*))
730 (with-locked-hash-table (table)
731 (let ((cell (find-classoid-cell name
:create t
)))
732 (ecase (info :type
:kind name
)
734 (:forthcoming-defclass-type
735 ;; FIXME: Currently, nothing needs to be done in this case.
736 ;; Later, when PCL is integrated tighter into SBCL, this
737 ;; might need more work.
741 (let ((old-value (classoid-cell-classoid cell
)))
743 ;; KLUDGE: The reason these clauses aren't directly
744 ;; parallel is that we need to use the internal
745 ;; CLASSOID structure ourselves, because we don't
746 ;; have CLASSes to work with until PCL is built. In
747 ;; the host, CLASSes have an approximately
748 ;; one-to-one correspondence with the target
749 ;; CLASSOIDs (as well as with the target CLASSes,
750 ;; modulo potential differences with respect to
753 (let ((old (class-of old-value
))
754 (new (class-of new-value
)))
756 (bug "Trying to change the metaclass of ~S from ~S to ~S in the ~
758 name
(class-name old
) (class-name new
))))
760 (let ((old (classoid-of old-value
))
761 (new (classoid-of new-value
)))
763 (warn "Changing meta-class of ~S from ~S to ~S."
764 name
(classoid-name old
) (classoid-name new
))))))
766 (error "Cannot redefine standard type ~S." name
))
768 (warn "Redefining DEFTYPE type to be a class: ~S" name
)
769 (setf (info :type
:expander name
) nil
)))
772 (%note-type-defined name
)
773 ;; we need to handle things like
774 ;; (setf (find-class 'foo) (find-class 'integer))
776 ;; (setf (find-class 'integer) (find-class 'integer))
777 (cond ((built-in-classoid-p new-value
)
778 (setf (info :type
:kind name
)
779 (or (info :type
:kind name
) :defined
))
780 (let ((translation (built-in-classoid-translation new-value
)))
782 (setf (info :type
:translator name
)
783 (lambda (c) (declare (ignore c
)) translation
)))))
785 (setf (info :type
:kind name
) :instance
)))
786 (setf (classoid-cell-classoid cell
) new-value
)
787 (unless (eq (info :type
:compiler-layout name
)
788 (classoid-layout new-value
))
789 (setf (info :type
:compiler-layout name
)
790 (classoid-layout new-value
))))))
793 (defun clear-classoid (name cell
)
794 (ecase (info :type
:kind name
)
798 (error "Attempt to remove :PRIMITIVE type: ~S" name
))
799 ((:forthcoming-defclass-type
:instance
)
801 ;; Note: We cannot remove the classoid cell from the table,
802 ;; since compiled code may refer directly to the cell, and
803 ;; getting a different cell for a classoid with the same name
804 ;; just would not do.
806 ;; Remove the proper name of the classoid.
807 (setf (classoid-name (classoid-cell-classoid cell
)) nil
)
809 (setf (classoid-cell-classoid cell
) nil
810 (classoid-cell-pcl-class cell
) nil
))
811 (setf (info :type
:kind name
) nil
812 (info :type
:documentation name
) nil
813 (info :type
:compiler-layout name
) nil
)))))
815 ;;; Called when we are about to define NAME as a class meeting some
816 ;;; predicate (such as a meta-class type test.) The first result is
817 ;;; always of the desired class. The second result is any existing
818 ;;; LAYOUT for this name.
820 ;;; Again, this should be compiler-only, but easier to make this
822 (defun insured-find-classoid (name predicate constructor
)
823 (declare (type function predicate constructor
))
824 (let ((table *forward-referenced-layouts
*))
825 (with-locked-hash-table (table)
826 (let* ((old (find-classoid name nil
))
827 (res (if (and old
(funcall predicate old
))
829 (funcall constructor
:name name
)))
830 (found (or (gethash name table
)
831 (when old
(classoid-layout old
)))))
833 (setf (layout-classoid found
) res
))
834 (values res found
)))))
836 ;;; If the classoid has a proper name, return the name, otherwise return
838 (defun classoid-proper-name (classoid)
839 #-sb-xc
(declare (type classoid classoid
))
840 (let ((name (classoid-name classoid
)))
841 (if (and name
(eq (find-classoid name nil
) classoid
))
845 ;;;; CLASS type operations
847 (!define-type-class classoid
)
849 ;;; We might be passed classoids with invalid layouts; in any pairwise
850 ;;; class comparison, we must ensure that both are valid before
852 (defun ensure-classoid-valid (classoid layout
)
853 (aver (eq classoid
(layout-classoid layout
)))
854 (when (layout-invalid layout
)
855 (if (typep classoid
'standard-classoid
)
856 (let ((class (classoid-pcl-class classoid
)))
858 ((sb!pcl
:class-finalized-p class
)
859 (sb!pcl
::force-cache-flushes class
))
860 ((sb!pcl
::class-has-a-forward-referenced-superclass-p class
)
861 (error "Invalid, unfinalizeable class ~S (classoid ~S)."
863 (t (sb!pcl
:finalize-inheritance class
))))
864 (error "Don't know how to ensure validity of ~S (not ~
865 a STANDARD-CLASSOID)." classoid
))))
867 (defun ensure-both-classoids-valid (class1 class2
)
868 (do ((layout1 (classoid-layout class1
) (classoid-layout class1
))
869 (layout2 (classoid-layout class2
) (classoid-layout class2
))
871 ((and (not (layout-invalid layout1
)) (not (layout-invalid layout2
))))
873 (ensure-classoid-valid class1 layout1
)
874 (ensure-classoid-valid class2 layout2
)))
876 (defun update-object-layout-or-invalid (object layout
)
877 (if (typep (classoid-of object
) 'standard-classoid
)
878 (sb!pcl
::check-wrapper-validity object
)
879 (sb!c
::%layout-invalid-error object layout
)))
881 ;;; Simple methods for TYPE= and SUBTYPEP should never be called when
882 ;;; the two classes are equal, since there are EQ checks in those
884 (!define-type-method
(classoid :simple-
=) (type1 type2
)
885 (aver (not (eq type1 type2
)))
888 (!define-type-method
(classoid :simple-subtypep
) (class1 class2
)
889 (aver (not (eq class1 class2
)))
890 (ensure-both-classoids-valid class1 class2
)
891 (let ((subclasses (classoid-subclasses class2
)))
892 (if (and subclasses
(gethash class1 subclasses
))
896 ;;; When finding the intersection of a sealed class and some other
897 ;;; class (not hierarchically related) the intersection is the union
898 ;;; of the currently shared subclasses.
899 (defun sealed-class-intersection2 (sealed other
)
900 (declare (type classoid sealed other
))
901 (let ((s-sub (classoid-subclasses sealed
))
902 (o-sub (classoid-subclasses other
)))
903 (if (and s-sub o-sub
)
904 (collect ((res *empty-type
* type-union
))
905 (dohash ((subclass layout
) s-sub
:locked t
)
906 (declare (ignore layout
))
907 (when (gethash subclass o-sub
)
908 (res (specifier-type subclass
))))
912 (!define-type-method
(classoid :simple-intersection2
) (class1 class2
)
913 (declare (type classoid class1 class2
))
914 (ensure-both-classoids-valid class1 class2
)
915 (cond ((eq class1 class2
)
917 ;; If one is a subclass of the other, then that is the
919 ((let ((subclasses (classoid-subclasses class2
)))
920 (and subclasses
(gethash class1 subclasses
)))
922 ((let ((subclasses (classoid-subclasses class1
)))
923 (and subclasses
(gethash class2 subclasses
)))
925 ;; Otherwise, we can't in general be sure that the
926 ;; intersection is empty, since a subclass of both might be
927 ;; defined. But we can eliminate it for some special cases.
928 ((or (structure-classoid-p class1
)
929 (structure-classoid-p class2
))
930 ;; No subclass of both can be defined.
932 ((eq (classoid-state class1
) :sealed
)
933 ;; checking whether a subclass of both can be defined:
934 (sealed-class-intersection2 class1 class2
))
935 ((eq (classoid-state class2
) :sealed
)
936 ;; checking whether a subclass of both can be defined:
937 (sealed-class-intersection2 class2 class1
))
939 ;; uncertain, since a subclass of both might be defined
942 ;;; KLUDGE: we need this to deal with the special-case INSTANCE and
943 ;;; FUNCALLABLE-INSTANCE types (which used to be CLASSOIDs until CSR
944 ;;; discovered that this was incompatible with the MOP class
945 ;;; hierarchy). See NAMED :COMPLEX-SUBTYPEP-ARG2
946 (defvar *non-instance-classoid-types
*
947 '(symbol system-area-pointer weak-pointer code-component
948 lra fdefn random-class
))
950 ;;; KLUDGE: we need this because of the need to represent
951 ;;; intersections of two classes, even when empty at a given time, as
952 ;;; uncanonicalized intersections because of the possibility of later
953 ;;; defining a subclass of both classes. The necessity for changing
954 ;;; the default return value from SUBTYPEP to NIL, T if no alternate
955 ;;; method is present comes about because, unlike the other places we
956 ;;; use INVOKE-COMPLEX-SUBTYPEP-ARG1-METHOD, in HAIRY methods and the
957 ;;; like, classes are in their own hierarchy with no possibility of
958 ;;; mixtures with other type classes.
959 (!define-type-method
(classoid :complex-subtypep-arg2
) (type1 class2
)
960 (if (and (intersection-type-p type1
)
961 (> (count-if #'classoid-p
(intersection-type-types type1
)) 1))
963 (invoke-complex-subtypep-arg1-method type1 class2 nil t
)))
965 (!define-type-method
(classoid :negate
) (type)
966 (make-negation-type :type type
))
968 (!define-type-method
(classoid :unparse
) (type)
969 (classoid-proper-name type
))
973 ;;; the CLASSOID that we use to represent type information for
974 ;;; STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS. The type system
975 ;;; side does not need to distinguish between STANDARD-CLASS and
976 ;;; FUNCALLABLE-STANDARD-CLASS.
977 (def!struct
(standard-classoid (:include classoid
)
978 (:constructor make-standard-classoid
)))
979 ;;; a metaclass for classes which aren't standardlike but will never
981 (def!struct
(static-classoid (:include classoid
)
982 (:constructor make-static-classoid
)))
984 ;;;; built-in classes
986 ;;; The BUILT-IN-CLASSES list is a data structure which configures the
987 ;;; creation of all the built-in classes. It contains all the info
988 ;;; that we need to maintain the mapping between classes, compile-time
989 ;;; types and run-time type codes. These options are defined:
991 ;;; :TRANSLATION (default none)
992 ;;; When this class is "parsed" as a type specifier, it is
993 ;;; translated into the specified internal type representation,
994 ;;; rather than being left as a class. This is used for types
995 ;;; which we want to canonicalize to some other kind of type
996 ;;; object because in general we want to be able to include more
997 ;;; information than just the class (e.g. for numeric types.)
999 ;;; :ENUMERABLE (default NIL)
1000 ;;; The value of the :ENUMERABLE slot in the created class.
1001 ;;; Meaningless in translated classes.
1003 ;;; :STATE (default :SEALED)
1004 ;;; The value of CLASS-STATE which we want on completion,
1005 ;;; indicating whether subclasses can be created at run-time.
1007 ;;; :HIERARCHICAL-P (default T unless any of the inherits are non-hierarchical)
1008 ;;; True if we can assign this class a unique inheritance depth.
1010 ;;; :CODES (default none)
1011 ;;; Run-time type codes which should be translated back to this
1012 ;;; class by CLASS-OF. Unspecified for abstract classes.
1014 ;;; :INHERITS (default this class and T)
1015 ;;; The class-precedence list for this class, with this class and
1018 ;;; :DIRECT-SUPERCLASSES (default to head of CPL)
1019 ;;; List of the direct superclasses of this class.
1021 ;;; FIXME: This doesn't seem to be needed after cold init (and so can
1022 ;;; probably be uninterned at the end of cold init).
1023 (defvar *built-in-classes
*)
1025 (/show0
"setting *BUILT-IN-CLASSES*")
1028 '((t :state
:read-only
:translation t
)
1029 (character :enumerable t
1030 :codes
(#.sb
!vm
:character-widetag
)
1031 :translation
(character-set)
1032 :prototype-form
(code-char 42))
1033 (symbol :codes
(#.sb
!vm
:symbol-header-widetag
)
1034 :prototype-form
'#:mu
)
1036 (system-area-pointer :codes
(#.sb
!vm
:sap-widetag
)
1037 :prototype-form
(sb!sys
:int-sap
42))
1038 (weak-pointer :codes
(#.sb
!vm
:weak-pointer-widetag
)
1039 :prototype-form
(sb!ext
:make-weak-pointer
(find-package "CL")))
1040 (code-component :codes
(#.sb
!vm
:code-header-widetag
))
1041 (lra :codes
(#.sb
!vm
:return-pc-header-widetag
))
1042 (fdefn :codes
(#.sb
!vm
:fdefn-widetag
)
1043 :prototype-form
(sb!kernel
:make-fdefn
"42"))
1044 (random-class) ; used for unknown type codes
1047 :codes
(#.sb
!vm
:closure-header-widetag
1048 #.sb
!vm
:simple-fun-header-widetag
)
1050 :prototype-form
(function (lambda () 42)))
1052 (number :translation number
)
1054 :translation complex
1056 :codes
(#.sb
!vm
:complex-widetag
)
1057 :prototype-form
(complex 42 42))
1058 (complex-single-float
1059 :translation
(complex single-float
)
1060 :inherits
(complex number
)
1061 :codes
(#.sb
!vm
:complex-single-float-widetag
)
1062 :prototype-form
(complex 42f0
42f0
))
1063 (complex-double-float
1064 :translation
(complex double-float
)
1065 :inherits
(complex number
)
1066 :codes
(#.sb
!vm
:complex-double-float-widetag
)
1067 :prototype-form
(complex 42d0
42d0
))
1070 :translation
(complex long-float
)
1071 :inherits
(complex number
)
1072 :codes
(#.sb
!vm
:complex-long-float-widetag
)
1073 :prototype-form
(complex 42l0 42l0))
1074 (real :translation real
:inherits
(number))
1077 :inherits
(real number
))
1079 :translation single-float
1080 :inherits
(float real number
)
1081 :codes
(#.sb
!vm
:single-float-widetag
)
1082 :prototype-form
42f0
)
1084 :translation double-float
1085 :inherits
(float real number
)
1086 :codes
(#.sb
!vm
:double-float-widetag
)
1087 :prototype-form
42d0
)
1090 :translation long-float
1091 :inherits
(float real number
)
1092 :codes
(#.sb
!vm
:long-float-widetag
)
1093 :prototype-form
42l0)
1095 :translation rational
1096 :inherits
(real number
))
1098 :translation
(and rational
(not integer
))
1099 :inherits
(rational real number
)
1100 :codes
(#.sb
!vm
:ratio-widetag
)
1101 :prototype-form
1/42)
1103 :translation integer
1104 :inherits
(rational real number
))
1106 :translation
(integer #.sb
!xc
:most-negative-fixnum
1107 #.sb
!xc
:most-positive-fixnum
)
1108 :inherits
(integer rational real number
)
1109 :codes
(#.sb
!vm
:even-fixnum-lowtag
#.sb
!vm
:odd-fixnum-lowtag
)
1112 :translation
(and integer
(not fixnum
))
1113 :inherits
(integer rational real number
)
1114 :codes
(#.sb
!vm
:bignum-widetag
)
1115 :prototype-form
(expt 2 #.
(* sb
!vm
:n-word-bits
(/ 3 2))))
1117 (array :translation array
:codes
(#.sb
!vm
:complex-array-widetag
)
1119 :prototype-form
(make-array nil
:adjustable t
))
1121 :translation simple-array
:codes
(#.sb
!vm
:simple-array-widetag
)
1123 :prototype-form
(make-array nil
))
1125 :translation
(or cons
(member nil
) vector extended-sequence
)
1129 :translation vector
:codes
(#.sb
!vm
:complex-vector-widetag
)
1130 :direct-superclasses
(array sequence
)
1131 :inherits
(array sequence
))
1133 :translation simple-vector
:codes
(#.sb
!vm
:simple-vector-widetag
)
1134 :direct-superclasses
(vector simple-array
)
1135 :inherits
(vector simple-array array sequence
)
1136 :prototype-form
(make-array 0))
1138 :translation bit-vector
:codes
(#.sb
!vm
:complex-bit-vector-widetag
)
1139 :inherits
(vector array sequence
)
1140 :prototype-form
(make-array 0 :element-type
'bit
:fill-pointer t
))
1142 :translation simple-bit-vector
:codes
(#.sb
!vm
:simple-bit-vector-widetag
)
1143 :direct-superclasses
(bit-vector simple-array
)
1144 :inherits
(bit-vector vector simple-array
1146 :prototype-form
(make-array 0 :element-type
'bit
))
1147 (simple-array-unsigned-byte-2
1148 :translation
(simple-array (unsigned-byte 2) (*))
1149 :codes
(#.sb
!vm
:simple-array-unsigned-byte-2-widetag
)
1150 :direct-superclasses
(vector simple-array
)
1151 :inherits
(vector simple-array array sequence
)
1152 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 2)))
1153 (simple-array-unsigned-byte-4
1154 :translation
(simple-array (unsigned-byte 4) (*))
1155 :codes
(#.sb
!vm
:simple-array-unsigned-byte-4-widetag
)
1156 :direct-superclasses
(vector simple-array
)
1157 :inherits
(vector simple-array array sequence
)
1158 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 4)))
1159 (simple-array-unsigned-byte-7
1160 :translation
(simple-array (unsigned-byte 7) (*))
1161 :codes
(#.sb
!vm
:simple-array-unsigned-byte-7-widetag
)
1162 :direct-superclasses
(vector simple-array
)
1163 :inherits
(vector simple-array array sequence
)
1164 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 7)))
1165 (simple-array-unsigned-byte-8
1166 :translation
(simple-array (unsigned-byte 8) (*))
1167 :codes
(#.sb
!vm
:simple-array-unsigned-byte-8-widetag
)
1168 :direct-superclasses
(vector simple-array
)
1169 :inherits
(vector simple-array array sequence
)
1170 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 8)))
1171 (simple-array-unsigned-byte-15
1172 :translation
(simple-array (unsigned-byte 15) (*))
1173 :codes
(#.sb
!vm
:simple-array-unsigned-byte-15-widetag
)
1174 :direct-superclasses
(vector simple-array
)
1175 :inherits
(vector simple-array array sequence
)
1176 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 15)))
1177 (simple-array-unsigned-byte-16
1178 :translation
(simple-array (unsigned-byte 16) (*))
1179 :codes
(#.sb
!vm
:simple-array-unsigned-byte-16-widetag
)
1180 :direct-superclasses
(vector simple-array
)
1181 :inherits
(vector simple-array array sequence
)
1182 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 16)))
1183 #!+#.
(cl:if
(cl:= 32 sb
!vm
:n-word-bits
) '(and) '(or))
1184 (simple-array-unsigned-byte-29
1185 :translation
(simple-array (unsigned-byte 29) (*))
1186 :codes
(#.sb
!vm
:simple-array-unsigned-byte-29-widetag
)
1187 :direct-superclasses
(vector simple-array
)
1188 :inherits
(vector simple-array array sequence
)
1189 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 29)))
1190 (simple-array-unsigned-byte-31
1191 :translation
(simple-array (unsigned-byte 31) (*))
1192 :codes
(#.sb
!vm
:simple-array-unsigned-byte-31-widetag
)
1193 :direct-superclasses
(vector simple-array
)
1194 :inherits
(vector simple-array array sequence
)
1195 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 31)))
1196 (simple-array-unsigned-byte-32
1197 :translation
(simple-array (unsigned-byte 32) (*))
1198 :codes
(#.sb
!vm
:simple-array-unsigned-byte-32-widetag
)
1199 :direct-superclasses
(vector simple-array
)
1200 :inherits
(vector simple-array array sequence
)
1201 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 32)))
1202 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1203 (simple-array-unsigned-byte-60
1204 :translation
(simple-array (unsigned-byte 60) (*))
1205 :codes
(#.sb
!vm
:simple-array-unsigned-byte-60-widetag
)
1206 :direct-superclasses
(vector simple-array
)
1207 :inherits
(vector simple-array array sequence
)
1208 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 60)))
1209 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1210 (simple-array-unsigned-byte-63
1211 :translation
(simple-array (unsigned-byte 63) (*))
1212 :codes
(#.sb
!vm
:simple-array-unsigned-byte-63-widetag
)
1213 :direct-superclasses
(vector simple-array
)
1214 :inherits
(vector simple-array array sequence
)
1215 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 63)))
1216 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1217 (simple-array-unsigned-byte-64
1218 :translation
(simple-array (unsigned-byte 64) (*))
1219 :codes
(#.sb
!vm
:simple-array-unsigned-byte-64-widetag
)
1220 :direct-superclasses
(vector simple-array
)
1221 :inherits
(vector simple-array array sequence
)
1222 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 64)))
1223 (simple-array-signed-byte-8
1224 :translation
(simple-array (signed-byte 8) (*))
1225 :codes
(#.sb
!vm
:simple-array-signed-byte-8-widetag
)
1226 :direct-superclasses
(vector simple-array
)
1227 :inherits
(vector simple-array array sequence
)
1228 :prototype-form
(make-array 0 :element-type
'(signed-byte 8)))
1229 (simple-array-signed-byte-16
1230 :translation
(simple-array (signed-byte 16) (*))
1231 :codes
(#.sb
!vm
:simple-array-signed-byte-16-widetag
)
1232 :direct-superclasses
(vector simple-array
)
1233 :inherits
(vector simple-array array sequence
)
1234 :prototype-form
(make-array 0 :element-type
'(signed-byte 16)))
1235 #!+#.
(cl:if
(cl:= 32 sb
!vm
:n-word-bits
) '(and) '(or))
1236 (simple-array-signed-byte-30
1237 :translation
(simple-array (signed-byte 30) (*))
1238 :codes
(#.sb
!vm
:simple-array-signed-byte-30-widetag
)
1239 :direct-superclasses
(vector simple-array
)
1240 :inherits
(vector simple-array array sequence
)
1241 :prototype-form
(make-array 0 :element-type
'(signed-byte 30)))
1242 (simple-array-signed-byte-32
1243 :translation
(simple-array (signed-byte 32) (*))
1244 :codes
(#.sb
!vm
:simple-array-signed-byte-32-widetag
)
1245 :direct-superclasses
(vector simple-array
)
1246 :inherits
(vector simple-array array sequence
)
1247 :prototype-form
(make-array 0 :element-type
'(signed-byte 32)))
1248 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1249 (simple-array-signed-byte-61
1250 :translation
(simple-array (signed-byte 61) (*))
1251 :codes
(#.sb
!vm
:simple-array-signed-byte-61-widetag
)
1252 :direct-superclasses
(vector simple-array
)
1253 :inherits
(vector simple-array array sequence
)
1254 :prototype-form
(make-array 0 :element-type
'(signed-byte 61)))
1255 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1256 (simple-array-signed-byte-64
1257 :translation
(simple-array (signed-byte 64) (*))
1258 :codes
(#.sb
!vm
:simple-array-signed-byte-64-widetag
)
1259 :direct-superclasses
(vector simple-array
)
1260 :inherits
(vector simple-array array sequence
)
1261 :prototype-form
(make-array 0 :element-type
'(signed-byte 64)))
1262 (simple-array-single-float
1263 :translation
(simple-array single-float
(*))
1264 :codes
(#.sb
!vm
:simple-array-single-float-widetag
)
1265 :direct-superclasses
(vector simple-array
)
1266 :inherits
(vector simple-array array sequence
)
1267 :prototype-form
(make-array 0 :element-type
'single-float
))
1268 (simple-array-double-float
1269 :translation
(simple-array double-float
(*))
1270 :codes
(#.sb
!vm
:simple-array-double-float-widetag
)
1271 :direct-superclasses
(vector simple-array
)
1272 :inherits
(vector simple-array array sequence
)
1273 :prototype-form
(make-array 0 :element-type
'double-float
))
1275 (simple-array-long-float
1276 :translation
(simple-array long-float
(*))
1277 :codes
(#.sb
!vm
:simple-array-long-float-widetag
)
1278 :direct-superclasses
(vector simple-array
)
1279 :inherits
(vector simple-array array sequence
)
1280 :prototype-form
(make-array 0 :element-type
'long-float
))
1281 (simple-array-complex-single-float
1282 :translation
(simple-array (complex single-float
) (*))
1283 :codes
(#.sb
!vm
:simple-array-complex-single-float-widetag
)
1284 :direct-superclasses
(vector simple-array
)
1285 :inherits
(vector simple-array array sequence
)
1286 :prototype-form
(make-array 0 :element-type
'(complex single-float
)))
1287 (simple-array-complex-double-float
1288 :translation
(simple-array (complex double-float
) (*))
1289 :codes
(#.sb
!vm
:simple-array-complex-double-float-widetag
)
1290 :direct-superclasses
(vector simple-array
)
1291 :inherits
(vector simple-array array sequence
)
1292 :prototype-form
(make-array 0 :element-type
'(complex double-float
)))
1294 (simple-array-complex-long-float
1295 :translation
(simple-array (complex long-float
) (*))
1296 :codes
(#.sb
!vm
:simple-array-complex-long-float-widetag
)
1297 :direct-superclasses
(vector simple-array
)
1298 :inherits
(vector simple-array array sequence
)
1299 :prototype-form
(make-array 0 :element-type
'(complex long-float
)))
1302 :direct-superclasses
(vector)
1303 :inherits
(vector array sequence
))
1305 :translation simple-string
1306 :direct-superclasses
(string simple-array
)
1307 :inherits
(string vector simple-array array sequence
))
1309 :translation
(vector nil
)
1310 :codes
(#.sb
!vm
:complex-vector-nil-widetag
)
1311 :direct-superclasses
(string)
1312 :inherits
(string vector array sequence
)
1313 :prototype-form
(make-array 0 :element-type
'nil
:fill-pointer t
))
1315 :translation
(simple-array nil
(*))
1316 :codes
(#.sb
!vm
:simple-array-nil-widetag
)
1317 :direct-superclasses
(vector-nil simple-string
)
1318 :inherits
(vector-nil simple-string string vector simple-array
1320 :prototype-form
(make-array 0 :element-type
'nil
))
1322 :translation base-string
1323 :codes
(#.sb
!vm
:complex-base-string-widetag
)
1324 :direct-superclasses
(string)
1325 :inherits
(string vector array sequence
)
1326 :prototype-form
(make-array 0 :element-type
'base-char
:fill-pointer t
))
1328 :translation simple-base-string
1329 :codes
(#.sb
!vm
:simple-base-string-widetag
)
1330 :direct-superclasses
(base-string simple-string
)
1331 :inherits
(base-string simple-string string vector simple-array
1333 :prototype-form
(make-array 0 :element-type
'base-char
))
1336 :translation
(vector character
)
1337 :codes
(#.sb
!vm
:complex-character-string-widetag
)
1338 :direct-superclasses
(string)
1339 :inherits
(string vector array sequence
)
1340 :prototype-form
(make-array 0 :element-type
'character
:fill-pointer t
))
1342 (simple-character-string
1343 :translation
(simple-array character
(*))
1344 :codes
(#.sb
!vm
:simple-character-string-widetag
)
1345 :direct-superclasses
(character-string simple-string
)
1346 :inherits
(character-string simple-string string vector simple-array
1348 :prototype-form
(make-array 0 :element-type
'character
))
1350 :translation
(or cons
(member nil
))
1351 :inherits
(sequence))
1353 :codes
(#.sb
!vm
:list-pointer-lowtag
)
1355 :inherits
(list sequence
)
1356 :prototype-form
(cons nil nil
))
1358 :translation
(member nil
)
1359 :inherits
(symbol list sequence
)
1360 :direct-superclasses
(symbol list
)
1361 :prototype-form
'nil
)
1372 :inherits
(stream)))))
1374 ;;; See also src/code/class-init.lisp where we finish setting up the
1375 ;;; translations for built-in types.
1377 (dolist (x *built-in-classes
*)
1378 #-sb-xc-host
(/show0
"at head of loop over *BUILT-IN-CLASSES*")
1381 (translation nil trans-p
)
1388 (hierarchical-p t
) ; might be modified below
1389 (direct-superclasses (if inherits
1390 (list (car inherits
))
1393 (declare (ignore codes state translation prototype-form
))
1394 (let ((inherits-list (if (eq name t
)
1396 (cons t
(reverse inherits
))))
1397 (classoid (make-built-in-classoid
1398 :enumerable enumerable
1400 :translation
(if trans-p
:initializing nil
)
1401 :direct-superclasses
1404 (mapcar #'find-classoid direct-superclasses
)))))
1405 (setf (info :type
:kind name
) #+sb-xc-host
:defined
#-sb-xc-host
:primitive
1406 (classoid-cell-classoid (find-classoid-cell name
:create t
)) classoid
)
1408 (setf (info :type
:builtin name
) classoid
))
1409 (let* ((inherits-vector
1413 (classoid-layout (find-classoid x
))))
1414 (when (minusp (layout-depthoid super-layout
))
1415 (setf hierarchical-p nil
))
1418 (depthoid (if hierarchical-p
1419 (or depth
(length inherits-vector
))
1422 (find-and-init-or-check-layout name
1427 :invalidate nil
)))))
1428 (/show0
"done with loop over *BUILT-IN-CLASSES*"))
1430 ;;; Define temporary PCL STANDARD-CLASSes. These will be set up
1431 ;;; correctly and the Lisp layout replaced by a PCL wrapper after PCL
1432 ;;; is loaded and the class defined.
1434 (/show0
"about to define temporary STANDARD-CLASSes")
1435 (dolist (x '(;; Why is STREAM duplicated in this list? Because, when
1436 ;; the inherits-vector of FUNDAMENTAL-STREAM is set up,
1437 ;; a vector containing the elements of the list below,
1438 ;; i.e. '(T STREAM STREAM), is created, and
1439 ;; this is what the function ORDER-LAYOUT-INHERITS
1442 ;; So, the purpose is to guarantee a valid layout for
1443 ;; the FUNDAMENTAL-STREAM class, matching what
1444 ;; ORDER-LAYOUT-INHERITS would do.
1445 ;; ORDER-LAYOUT-INHERITS would place STREAM at index 2
1446 ;; in the INHERITS(-VECTOR). Index 1 would not be
1447 ;; filled, so STREAM is duplicated there (as
1448 ;; ORDER-LAYOUTS-INHERITS would do). Maybe the
1449 ;; duplicate definition could be removed (removing a
1450 ;; STREAM element), because FUNDAMENTAL-STREAM is
1451 ;; redefined after PCL is set up, anyway. But to play
1452 ;; it safely, we define the class with a valid INHERITS
1454 (fundamental-stream (t stream stream
))))
1455 (/show0
"defining temporary STANDARD-CLASS")
1456 (let* ((name (first x
))
1457 (inherits-list (second x
))
1458 (classoid (make-standard-classoid :name name
))
1459 (classoid-cell (find-classoid-cell name
:create t
)))
1460 ;; Needed to open-code the MAP, below
1461 (declare (type list inherits-list
))
1462 (setf (classoid-cell-classoid classoid-cell
) classoid
1463 (info :type
:kind name
) :instance
)
1464 (let ((inherits (map 'simple-vector
1466 (classoid-layout (find-classoid x
)))
1468 #-sb-xc-host
(/show0
"INHERITS=..") #-sb-xc-host
(/hexstr inherits
)
1469 (register-layout (find-and-init-or-check-layout name
0 inherits -
1 0)
1471 (/show0
"done defining temporary STANDARD-CLASSes"))
1473 ;;; Now that we have set up the class heterarchy, seal the sealed
1474 ;;; classes. This must be done after the subclasses have been set up.
1476 (dolist (x *built-in-classes
*)
1477 (destructuring-bind (name &key
(state :sealed
) &allow-other-keys
) x
1478 (setf (classoid-state (find-classoid name
)) state
))))
1480 ;;;; class definition/redefinition
1482 ;;; This is to be called whenever we are altering a class.
1483 (defun modify-classoid (classoid)
1485 (when (member (classoid-state classoid
) '(:read-only
:frozen
))
1486 ;; FIXME: This should probably be CERROR.
1487 (warn "making ~(~A~) class ~S writable"
1488 (classoid-state classoid
)
1489 (classoid-name classoid
))
1490 (setf (classoid-state classoid
) nil
)))
1492 ;;; Mark LAYOUT as invalid. Setting DEPTHOID -1 helps cause unsafe
1493 ;;; structure type tests to fail. Remove class from all superclasses
1494 ;;; too (might not be registered, so might not be in subclasses of the
1495 ;;; nominal superclasses.) We set the layout-clos-hash slots to 0 to
1496 ;;; invalidate the wrappers for specialized dispatch functions, which
1497 ;;; use those slots as indexes into tables.
1498 (defun invalidate-layout (layout)
1499 (declare (type layout layout
))
1500 (setf (layout-invalid layout
) t
1501 (layout-depthoid layout
) -
1)
1502 (setf (layout-clos-hash layout
) 0)
1503 (let ((inherits (layout-inherits layout
))
1504 (classoid (layout-classoid layout
)))
1505 (modify-classoid classoid
)
1506 (dovector (super inherits
)
1507 (let ((subs (classoid-subclasses (layout-classoid super
))))
1509 (remhash classoid subs
)))))
1512 ;;;; cold loading initializations
1514 ;;; FIXME: It would be good to arrange for this to be called when the
1515 ;;; cross-compiler is being built, not just when the target Lisp is
1516 ;;; being cold loaded. Perhaps this could be moved to its own file
1517 ;;; late in the build-order.lisp-expr sequence, and be put in
1518 ;;; !COLD-INIT-FORMS there?
1519 (defun !class-finalize
()
1520 (dohash ((name layout
) *forward-referenced-layouts
*)
1521 (let ((class (find-classoid name nil
)))
1523 (setf (layout-classoid layout
) (make-undefined-classoid name
)))
1524 ((eq (classoid-layout class
) layout
)
1525 (remhash name
*forward-referenced-layouts
*))
1527 (error "Something strange with forward layout for ~S:~% ~S"
1531 #-sb-xc-host
(/show0
"about to set *BUILT-IN-CLASS-CODES*")
1532 (setq *built-in-class-codes
*
1533 (let* ((initial-element
1535 ;; KLUDGE: There's a FIND-CLASSOID DEFTRANSFORM for
1536 ;; constant class names which creates fast but
1537 ;; non-cold-loadable, non-compact code. In this
1538 ;; context, we'd rather have compact, cold-loadable
1539 ;; code. -- WHN 19990928
1540 (declare (notinline find-classoid
))
1541 (classoid-layout (find-classoid 'random-class
))))
1542 (res (make-array 256 :initial-element initial-element
)))
1543 (dolist (x *built-in-classes
* res
)
1544 (destructuring-bind (name &key codes
&allow-other-keys
)
1546 (let ((layout (classoid-layout (find-classoid name
))))
1547 (dolist (code codes
)
1548 (setf (svref res code
) layout
)))))))
1549 (setq *null-classoid-layout
*
1550 ;; KLUDGE: we use (LET () ...) instead of a LOCALLY here to
1551 ;; work around a bug in the LOCALLY handling in the fopcompiler
1552 ;; (present in 0.9.13-0.9.14.18). -- JES, 2006-07-16
1554 (declare (notinline find-classoid
))
1555 (classoid-layout (find-classoid 'null
))))
1556 #-sb-xc-host
(/show0
"done setting *BUILT-IN-CLASS-CODES*"))
1558 (!defun-from-collected-cold-init-forms
!classes-cold-init
)