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 (function (symbol) layout
) find-layout
))
252 (defun find-layout (name)
253 (let ((classoid (find-classoid name nil
)))
254 (or (and classoid
(classoid-layout classoid
))
255 (gethash name
*forward-referenced-layouts
*)
256 (setf (gethash name
*forward-referenced-layouts
*)
257 (make-layout :classoid
(or classoid
258 (make-undefined-classoid name
)))))))
260 ;;; If LAYOUT is uninitialized, initialize it with CLASSOID, LENGTH,
261 ;;; INHERITS, and DEPTHOID, otherwise require that it be consistent
262 ;;; with CLASSOID, LENGTH, INHERITS, and DEPTHOID.
264 ;;; UNDEFINED-CLASS values are interpreted specially as "we don't know
265 ;;; anything about the class", so if LAYOUT is initialized, any
266 ;;; preexisting class slot value is OK, and if it's not initialized,
267 ;;; its class slot value is set to an UNDEFINED-CLASS. -- FIXME: This
268 ;;; is no longer true, :UNINITIALIZED used instead.
269 (declaim (ftype (function (layout classoid index simple-vector layout-depthoid
272 init-or-check-layout
))
273 (defun init-or-check-layout
274 (layout classoid length inherits depthoid nuntagged
)
275 (cond ((eq (layout-invalid layout
) :uninitialized
)
276 ;; There was no layout before, we just created one which
277 ;; we'll now initialize with our information.
278 (setf (layout-length layout
) length
279 (layout-inherits layout
) inherits
280 (layout-depthoid layout
) depthoid
281 (layout-n-untagged-slots layout
) nuntagged
282 (layout-classoid layout
) classoid
283 (layout-invalid layout
) nil
))
284 ;; FIXME: Now that LAYOUTs are born :UNINITIALIZED, maybe this
285 ;; clause is not needed?
286 ((not *type-system-initialized
*)
287 (setf (layout-classoid layout
) classoid
))
289 ;; There was an old layout already initialized with old
290 ;; information, and we'll now check that old information
291 ;; which was known with certainty is consistent with current
292 ;; information which is known with certainty.
293 (check-layout layout classoid length inherits depthoid nuntagged
)))
296 ;;; In code for the target Lisp, we don't use dump LAYOUTs using the
297 ;;; standard load form mechanism, we use special fops instead, in
298 ;;; order to make cold load come out right. But when we're building
299 ;;; the cross-compiler, we can't do that because we don't have access
300 ;;; to special non-ANSI low-level things like special fops, and we
301 ;;; don't need to do that anyway because our code isn't going to be
302 ;;; cold loaded, so we use the ordinary load form system.
304 ;;; KLUDGE: A special hack causes this not to be called when we are
305 ;;; building code for the target Lisp. It would be tidier to just not
306 ;;; have it in place when we're building the target Lisp, but it
307 ;;; wasn't clear how to do that without rethinking DEF!STRUCT quite a
308 ;;; bit, so I punted. -- WHN 19990914
310 (defun make-load-form-for-layout (layout &optional env
)
311 (declare (type layout layout
))
312 (declare (ignore env
))
313 (when (layout-invalid layout
)
314 (compiler-error "can't dump reference to obsolete class: ~S"
315 (layout-classoid layout
)))
316 (let ((name (classoid-name (layout-classoid layout
))))
318 (compiler-error "can't dump anonymous LAYOUT: ~S" layout
))
319 ;; Since LAYOUT refers to a class which refers back to the LAYOUT,
320 ;; we have to do this in two stages, like the TREE-WITH-PARENT
321 ;; example in the MAKE-LOAD-FORM entry in the ANSI spec.
323 ;; "creation" form (which actually doesn't create a new LAYOUT if
324 ;; there's a preexisting one with this name)
325 `(find-layout ',name
)
326 ;; "initialization" form (which actually doesn't initialize
327 ;; preexisting LAYOUTs, just checks that they're consistent).
328 `(init-or-check-layout ',layout
329 ',(layout-classoid layout
)
330 ',(layout-length layout
)
331 ',(layout-inherits layout
)
332 ',(layout-depthoid layout
)
333 ',(layout-n-untagged-slots layout
)))))
335 ;;; If LAYOUT's slot values differ from the specified slot values in
336 ;;; any interesting way, then give a warning and return T.
337 (declaim (ftype (function (simple-string
344 redefine-layout-warning
))
345 (defun redefine-layout-warning (old-context old-layout
346 context length inherits depthoid nuntagged
)
347 (declare (type layout old-layout
) (type simple-string old-context context
))
348 (let ((name (layout-proper-name old-layout
)))
349 (or (let ((old-inherits (layout-inherits old-layout
)))
350 (or (when (mismatch old-inherits
352 :key
#'layout-proper-name
)
353 (warn "change in superclasses of class ~S:~% ~
354 ~A superclasses: ~S~% ~
358 (map 'list
#'layout-proper-name old-inherits
)
360 (map 'list
#'layout-proper-name inherits
))
362 (let ((diff (mismatch old-inherits inherits
)))
366 ~:(~A~) definition of superclass ~S is incompatible with~% ~
370 (layout-proper-name (svref old-inherits diff
))
373 (let ((old-length (layout-length old-layout
)))
374 (unless (= old-length length
)
375 (warn "change in instance length of class ~S:~% ~
379 old-context old-length
382 (let ((old-nuntagged (layout-n-untagged-slots old-layout
)))
383 (unless (= old-nuntagged nuntagged
)
384 (warn "change in instance layout of class ~S:~% ~
385 ~A untagged slots: ~W~% ~
386 ~A untagged slots: ~W"
388 old-context old-nuntagged
391 (unless (= (layout-depthoid old-layout
) depthoid
)
392 (warn "change in the inheritance structure of class ~S~% ~
393 between the ~A definition and the ~A definition"
394 name old-context context
)
397 ;;; Require that LAYOUT data be consistent with CLASS, LENGTH,
398 ;;; INHERITS, and DEPTHOID.
399 (declaim (ftype (function
400 (layout classoid index simple-vector layout-depthoid index
))
402 (defun check-layout (layout classoid length inherits depthoid nuntagged
)
403 (aver (eq (layout-classoid layout
) classoid
))
404 (when (redefine-layout-warning "current" layout
405 "compile time" length inherits depthoid
407 ;; Classic CMU CL had more options here. There are several reasons
408 ;; why they might want more options which are less appropriate for
409 ;; us: (1) It's hard to fit the classic CMU CL flexible approach
410 ;; into the ANSI-style MAKE-LOAD-FORM system, and having a
411 ;; non-MAKE-LOAD-FORM-style system is painful when we're trying to
412 ;; make the cross-compiler run under vanilla ANSI Common Lisp. (2)
413 ;; We have CLOS now, and if you want to be able to flexibly
414 ;; redefine classes without restarting the system, it'd make sense
415 ;; to use that, so supporting complexity in order to allow
416 ;; modifying DEFSTRUCTs without restarting the system is a low
417 ;; priority. (3) We now have the ability to rebuild the SBCL
418 ;; system from scratch, so we no longer need this functionality in
419 ;; order to maintain the SBCL system by modifying running images.
420 (error "The class ~S was not changed, and there's no guarantee that~@
421 the loaded code (which expected another layout) will work."
422 (layout-proper-name layout
)))
425 ;;; a common idiom (the same as CMU CL FIND-LAYOUT) rolled up into a
426 ;;; single function call
428 ;;; Used by the loader to forward-reference layouts for classes whose
429 ;;; definitions may not have been loaded yet. This allows type tests
430 ;;; to be loaded when the type definition hasn't been loaded yet.
431 (declaim (ftype (function (symbol index simple-vector layout-depthoid index
)
433 find-and-init-or-check-layout
))
434 (defun find-and-init-or-check-layout (name length inherits depthoid nuntagged
)
435 (let ((layout (find-layout name
)))
436 (init-or-check-layout layout
437 (or (find-classoid name nil
)
438 (layout-classoid layout
))
444 ;;; Record LAYOUT as the layout for its class, adding it as a subtype
445 ;;; of all superclasses. This is the operation that "installs" a
446 ;;; layout for a class in the type system, clobbering any old layout.
447 ;;; However, this does not modify the class namespace; that is a
448 ;;; separate operation (think anonymous classes.)
449 ;;; -- If INVALIDATE, then all the layouts for any old definition
450 ;;; and subclasses are invalidated, and the SUBCLASSES slot is cleared.
451 ;;; -- If DESTRUCT-LAYOUT, then this is some old layout, and is to be
452 ;;; destructively modified to hold the same type information.
453 (eval-when (#-sb-xc
:compile-toplevel
:load-toplevel
:execute
)
454 (defun register-layout (layout &key
(invalidate t
) destruct-layout
)
455 (declare (type layout layout
) (type (or layout null
) destruct-layout
))
456 (let* ((classoid (layout-classoid layout
))
457 (classoid-layout (classoid-layout classoid
))
458 (subclasses (classoid-subclasses classoid
)))
460 ;; Attempting to register ourselves with a temporary undefined
461 ;; class placeholder is almost certainly a programmer error. (I
462 ;; should know, I did it.) -- WHN 19990927
463 (aver (not (undefined-classoid-p classoid
)))
465 ;; This assertion dates from classic CMU CL. The rationale is
466 ;; probably that calling REGISTER-LAYOUT more than once for the
467 ;; same LAYOUT is almost certainly a programmer error.
468 (aver (not (eq classoid-layout layout
)))
470 ;; Figure out what classes are affected by the change, and issue
471 ;; appropriate warnings and invalidations.
472 (when classoid-layout
473 (modify-classoid classoid
)
475 (dohash (subclass subclass-layout subclasses
)
476 (modify-classoid subclass
)
478 (invalidate-layout subclass-layout
))))
480 (invalidate-layout classoid-layout
)
481 (setf (classoid-subclasses classoid
) nil
)))
484 (setf (layout-invalid destruct-layout
) nil
485 (layout-inherits destruct-layout
) (layout-inherits layout
)
486 (layout-depthoid destruct-layout
)(layout-depthoid layout
)
487 (layout-length destruct-layout
) (layout-length layout
)
488 (layout-n-untagged-slots destruct-layout
) (layout-n-untagged-slots layout
)
489 (layout-info destruct-layout
) (layout-info layout
)
490 (classoid-layout classoid
) destruct-layout
)
491 (setf (layout-invalid layout
) nil
492 (classoid-layout classoid
) layout
))
494 (dovector (super-layout (layout-inherits layout
))
495 (let* ((super (layout-classoid super-layout
))
496 (subclasses (or (classoid-subclasses super
)
497 (setf (classoid-subclasses super
)
498 (make-hash-table :test
'eq
)))))
499 (when (and (eq (classoid-state super
) :sealed
)
500 (not (gethash classoid subclasses
)))
501 (warn "unsealing sealed class ~S in order to subclass it"
502 (classoid-name super
))
503 (setf (classoid-state super
) :read-only
))
504 (setf (gethash classoid subclasses
)
505 (or destruct-layout layout
)))))
510 ;;; Arrange the inherited layouts to appear at their expected depth,
511 ;;; ensuring that hierarchical type tests succeed. Layouts with
512 ;;; DEPTHOID >= 0 (i.e. hierarchical classes) are placed first,
513 ;;; at exactly that index in the INHERITS vector. Then, non-hierarchical
514 ;;; layouts are placed in remaining elements. Then, any still-empty
515 ;;; elements are filled with their successors, ensuring that each
516 ;;; element contains a valid layout.
518 ;;; This reordering may destroy CPL ordering, so the inherits should
519 ;;; not be read as being in CPL order.
520 (defun order-layout-inherits (layouts)
521 (declare (simple-vector layouts
))
522 (let ((length (length layouts
))
525 (let ((depth (layout-depthoid (svref layouts i
))))
526 (when (> depth max-depth
)
527 (setf max-depth depth
))))
528 (let* ((new-length (max (1+ max-depth
) length
))
529 ;; KLUDGE: 0 here is the "uninitialized" element. We need
530 ;; to specify it explicitly for portability purposes, as
531 ;; elements can be read before being set [ see below, "(EQL
532 ;; OLD-LAYOUT 0)" ]. -- CSR, 2002-04-20
533 (inherits (make-array new-length
:initial-element
0)))
535 (let* ((layout (svref layouts i
))
536 (depth (layout-depthoid layout
)))
537 (unless (eql depth -
1)
538 (let ((old-layout (svref inherits depth
)))
539 (unless (or (eql old-layout
0) (eq old-layout layout
))
540 (error "layout depth conflict: ~S~%" layouts
)))
541 (setf (svref inherits depth
) layout
))))
545 (declare (type index i j
))
546 (let* ((layout (svref layouts i
))
547 (depth (layout-depthoid layout
)))
549 (loop (when (eql (svref inherits j
) 0)
552 (setf (svref inherits j
) layout
))))
553 (do ((i (1- new-length
) (1- i
)))
555 (declare (type fixnum i
))
556 (when (eql (svref inherits i
) 0)
557 (setf (svref inherits i
) (svref inherits
(1+ i
)))))
560 ;;;; class precedence lists
562 ;;; Topologically sort the list of objects to meet a set of ordering
563 ;;; constraints given by pairs (A . B) constraining A to precede B.
564 ;;; When there are multiple objects to choose, the tie-breaker
565 ;;; function is called with both the list of object to choose from and
566 ;;; the reverse ordering built so far.
567 (defun topological-sort (objects constraints tie-breaker
)
568 (declare (list objects constraints
)
569 (function tie-breaker
))
570 (let ((obj-info (make-hash-table :size
(length objects
)))
573 (dolist (constraint constraints
)
574 (let ((obj1 (car constraint
))
575 (obj2 (cdr constraint
)))
576 (let ((info2 (gethash obj2 obj-info
)))
579 (setf (gethash obj2 obj-info
) (list 1))))
580 (let ((info1 (gethash obj1 obj-info
)))
582 (push obj2
(rest info1
))
583 (setf (gethash obj1 obj-info
) (list 0 obj2
))))))
584 (dolist (obj objects
)
585 (let ((info (gethash obj obj-info
)))
586 (when (or (not info
) (zerop (first info
)))
587 (push obj free-objs
))))
589 (flet ((next-result (obj)
591 (dolist (successor (rest (gethash obj obj-info
)))
592 (let* ((successor-info (gethash successor obj-info
))
593 (count (1- (first successor-info
))))
594 (setf (first successor-info
) count
)
596 (push successor free-objs
))))))
597 (cond ((endp free-objs
)
598 (dohash (obj info obj-info
)
599 (unless (zerop (first info
))
600 (error "Topological sort failed due to constraint on ~S."
602 (return (nreverse result
)))
603 ((endp (rest free-objs
))
604 (next-result (pop free-objs
)))
606 (let ((obj (funcall tie-breaker free-objs result
)))
607 (setf free-objs
(remove obj free-objs
))
608 (next-result obj
))))))))
611 ;;; standard class precedence list computation
612 (defun std-compute-class-precedence-list (class)
615 (labels ((note-class (class)
616 (unless (member class classes
)
618 (let ((superclasses (classoid-direct-superclasses class
)))
620 (rest superclasses
(rest rest
)))
622 (let ((next (first rest
)))
623 (push (cons prev next
) constraints
)
625 (dolist (class superclasses
)
626 (note-class class
)))))
627 (std-cpl-tie-breaker (free-classes rev-cpl
)
628 (dolist (class rev-cpl
(first free-classes
))
629 (let* ((superclasses (classoid-direct-superclasses class
))
630 (intersection (intersection free-classes
633 (return (first intersection
)))))))
635 (topological-sort classes constraints
#'std-cpl-tie-breaker
))))
637 ;;;; object types to represent classes
639 ;;; An UNDEFINED-CLASSOID is a cookie we make up to stick in forward
640 ;;; referenced layouts. Users should never see them.
641 (def!struct
(undefined-classoid
643 (:constructor make-undefined-classoid
(name))))
645 ;;; BUILT-IN-CLASS is used to represent the standard classes that
646 ;;; aren't defined with DEFSTRUCT and other specially implemented
647 ;;; primitive types whose only attribute is their name.
649 ;;; Some BUILT-IN-CLASSes have a TRANSLATION, which means that they
650 ;;; are effectively DEFTYPE'd to some other type (usually a union of
651 ;;; other classes or a "primitive" type such as NUMBER, ARRAY, etc.)
652 ;;; This translation is done when type specifiers are parsed. Type
653 ;;; system operations (union, subtypep, etc.) should never encounter
654 ;;; translated classes, only their translation.
655 (def!struct
(built-in-classoid (:include classoid
)
656 (:constructor make-built-in-classoid
))
657 ;; the type we translate to on parsing. If NIL, then this class
658 ;; stands on its own; or it can be set to :INITIALIZING for a period
660 (translation nil
:type
(or ctype
(member nil
:initializing
))))
662 ;;; STRUCTURE-CLASS represents what we need to know about structure
663 ;;; classes. Non-structure "typed" defstructs are a special case, and
664 ;;; don't have a corresponding class.
665 (def!struct
(structure-classoid (:include classoid
)
666 (:constructor make-structure-classoid
))
667 ;; If true, a default keyword constructor for this structure.
668 (constructor nil
:type
(or function null
)))
670 ;;;; classoid namespace
672 ;;; We use an indirection to allow forward referencing of class
673 ;;; definitions with load-time resolution.
674 (def!struct
(classoid-cell
675 (:constructor make-classoid-cell
(name &optional classoid
))
676 (:make-load-form-fun
(lambda (c)
678 ',(classoid-cell-name c
))))
679 #-no-ansi-print-object
680 (:print-object
(lambda (s stream
)
681 (print-unreadable-object (s stream
:type t
)
682 (prin1 (classoid-cell-name s
) stream
)))))
683 ;; Name of class we expect to find.
684 (name nil
:type symbol
:read-only t
)
685 ;; Class or NIL if not yet defined.
686 (classoid nil
:type
(or classoid null
)))
687 (defun find-classoid-cell (name)
688 (or (info :type
:classoid name
)
689 (setf (info :type
:classoid name
)
690 (make-classoid-cell name
))))
692 (eval-when (#-sb-xc
:compile-toplevel
:load-toplevel
:execute
)
693 (defun find-classoid (name &optional
(errorp t
) environment
)
695 "Return the class with the specified NAME. If ERRORP is false, then
696 NIL is returned when no such class exists."
697 (declare (type symbol name
) (ignore environment
))
698 (let ((res (classoid-cell-classoid (find-classoid-cell name
))))
699 (if (or res
(not errorp
))
701 (error 'simple-type-error
703 :expected-type
'class
704 :format-control
"class not yet defined:~% ~S"
705 :format-arguments
(list name
)))))
706 (defun (setf find-classoid
) (new-value name
)
707 #-sb-xc
(declare (type (or null classoid
) new-value
))
710 (ecase (info :type
:kind name
)
714 (error "attempt to redefine :PRIMITIVE type: ~S" name
))
715 ((:forthcoming-defclass-type
:instance
)
716 (setf (info :type
:kind name
) nil
717 (info :type
:classoid name
) nil
718 (info :type
:documentation name
) nil
719 (info :type
:compiler-layout name
) nil
))))
721 (ecase (info :type
:kind name
)
723 (:forthcoming-defclass-type
724 ;; XXX Currently, nothing needs to be done in this
725 ;; case. Later, when PCL is integrated tighter into SBCL, this
726 ;; might need more work.
729 ;; KLUDGE: The reason these clauses aren't directly parallel
730 ;; is that we need to use the internal CLASSOID structure
731 ;; ourselves, because we don't have CLASSes to work with until
732 ;; PCL is built. In the host, CLASSes have an approximately
733 ;; one-to-one correspondence with the target CLASSOIDs (as
734 ;; well as with the target CLASSes, modulo potential
735 ;; differences with respect to conditions).
737 (let ((old (class-of (find-classoid name
)))
738 (new (class-of new-value
)))
740 (bug "trying to change the metaclass of ~S from ~S to ~S in the ~
742 name
(class-name old
) (class-name new
))))
744 (let ((old (classoid-of (find-classoid name
)))
745 (new (classoid-of new-value
)))
747 (warn "changing meta-class of ~S from ~S to ~S"
748 name
(classoid-name old
) (classoid-name new
)))))
750 (error "illegal to redefine standard type ~S" name
))
752 (warn "redefining DEFTYPE type to be a class: ~S" name
)
753 (setf (info :type
:expander name
) nil
)))
755 (remhash name
*forward-referenced-layouts
*)
756 (%note-type-defined name
)
757 ;; we need to handle things like
758 ;; (setf (find-class 'foo) (find-class 'integer))
760 ;; (setf (find-class 'integer) (find-class 'integer))
762 ((built-in-classoid-p new-value
)
763 (setf (info :type
:kind name
) (or (info :type
:kind name
) :defined
))
764 (let ((translation (built-in-classoid-translation new-value
)))
766 (setf (info :type
:translator name
)
767 (lambda (c) (declare (ignore c
)) translation
)))))
768 (t (setf (info :type
:kind name
) :instance
)))
769 (setf (classoid-cell-classoid (find-classoid-cell name
)) new-value
)
770 (unless (eq (info :type
:compiler-layout name
)
771 (classoid-layout new-value
))
772 (setf (info :type
:compiler-layout name
) (classoid-layout new-value
)))))
776 ;;; Called when we are about to define NAME as a class meeting some
777 ;;; predicate (such as a meta-class type test.) The first result is
778 ;;; always of the desired class. The second result is any existing
779 ;;; LAYOUT for this name.
780 (defun insured-find-classoid (name predicate constructor
)
781 (declare (type function predicate constructor
))
782 (let* ((old (find-classoid name nil
))
783 (res (if (and old
(funcall predicate old
))
785 (funcall constructor
:name name
)))
786 (found (or (gethash name
*forward-referenced-layouts
*)
787 (when old
(classoid-layout old
)))))
789 (setf (layout-classoid found
) res
))
792 ;;; If the class has a proper name, return the name, otherwise return
794 (defun classoid-proper-name (class)
795 #-sb-xc
(declare (type classoid class
))
796 (let ((name (classoid-name class
)))
797 (if (and name
(eq (find-classoid name nil
) class
))
801 ;;;; CLASS type operations
803 (!define-type-class classoid
)
805 ;;; We might be passed classoids with invalid layouts; in any pairwise
806 ;;; class comparison, we must ensure that both are valid before
808 (defun ensure-classoid-valid (classoid layout
)
809 (aver (eq classoid
(layout-classoid layout
)))
810 (when (layout-invalid layout
)
811 (if (typep classoid
'standard-classoid
)
812 (let ((class (classoid-pcl-class classoid
)))
814 ((sb!pcl
:class-finalized-p class
)
815 (sb!pcl
::force-cache-flushes class
))
816 ((sb!pcl
::class-has-a-forward-referenced-superclass-p class
)
817 (error "Invalid, unfinalizeable class ~S (classoid ~S)."
819 (t (sb!pcl
:finalize-inheritance class
))))
820 (error "Don't know how to ensure validity of ~S (not ~
821 a STANDARD-CLASSOID)." classoid
))))
823 (defun ensure-both-classoids-valid (class1 class2
)
824 (do ((layout1 (classoid-layout class1
) (classoid-layout class1
))
825 (layout2 (classoid-layout class2
) (classoid-layout class2
))
827 ((and (not (layout-invalid layout1
)) (not (layout-invalid layout2
))))
829 (ensure-classoid-valid class1 layout1
)
830 (ensure-classoid-valid class2 layout2
)))
832 (defun update-object-layout-or-invalid (object layout
)
833 (if (typep (classoid-of object
) 'standard-classoid
)
834 (sb!pcl
::check-wrapper-validity object
)
835 (sb!c
::%layout-invalid-error object layout
)))
837 ;;; Simple methods for TYPE= and SUBTYPEP should never be called when
838 ;;; the two classes are equal, since there are EQ checks in those
840 (!define-type-method
(classoid :simple-
=) (type1 type2
)
841 (aver (not (eq type1 type2
)))
844 (!define-type-method
(classoid :simple-subtypep
) (class1 class2
)
845 (aver (not (eq class1 class2
)))
846 (ensure-both-classoids-valid class1 class2
)
847 (let ((subclasses (classoid-subclasses class2
)))
848 (if (and subclasses
(gethash class1 subclasses
))
852 ;;; When finding the intersection of a sealed class and some other
853 ;;; class (not hierarchically related) the intersection is the union
854 ;;; of the currently shared subclasses.
855 (defun sealed-class-intersection2 (sealed other
)
856 (declare (type classoid sealed other
))
857 (let ((s-sub (classoid-subclasses sealed
))
858 (o-sub (classoid-subclasses other
)))
859 (if (and s-sub o-sub
)
860 (collect ((res *empty-type
* type-union
))
861 (dohash (subclass layout s-sub
)
862 (declare (ignore layout
))
863 (when (gethash subclass o-sub
)
864 (res (specifier-type subclass
))))
868 (!define-type-method
(classoid :simple-intersection2
) (class1 class2
)
869 (declare (type classoid class1 class2
))
870 (ensure-both-classoids-valid class1 class2
)
871 (cond ((eq class1 class2
)
873 ;; If one is a subclass of the other, then that is the
875 ((let ((subclasses (classoid-subclasses class2
)))
876 (and subclasses
(gethash class1 subclasses
)))
878 ((let ((subclasses (classoid-subclasses class1
)))
879 (and subclasses
(gethash class2 subclasses
)))
881 ;; Otherwise, we can't in general be sure that the
882 ;; intersection is empty, since a subclass of both might be
883 ;; defined. But we can eliminate it for some special cases.
884 ((or (structure-classoid-p class1
)
885 (structure-classoid-p class2
))
886 ;; No subclass of both can be defined.
888 ((eq (classoid-state class1
) :sealed
)
889 ;; checking whether a subclass of both can be defined:
890 (sealed-class-intersection2 class1 class2
))
891 ((eq (classoid-state class2
) :sealed
)
892 ;; checking whether a subclass of both can be defined:
893 (sealed-class-intersection2 class2 class1
))
895 ;; uncertain, since a subclass of both might be defined
898 ;;; KLUDGE: we need this to deal with the special-case INSTANCE and
899 ;;; FUNCALLABLE-INSTANCE types (which used to be CLASSOIDs until CSR
900 ;;; discovered that this was incompatible with the MOP class
901 ;;; hierarchy). See NAMED :COMPLEX-SUBTYPEP-ARG2
902 (defvar *non-instance-classoid-types
*
903 '(symbol system-area-pointer weak-pointer code-component
904 lra fdefn random-class
))
906 ;;; KLUDGE: we need this because of the need to represent
907 ;;; intersections of two classes, even when empty at a given time, as
908 ;;; uncanonicalized intersections because of the possibility of later
909 ;;; defining a subclass of both classes. The necessity for changing
910 ;;; the default return value from SUBTYPEP to NIL, T if no alternate
911 ;;; method is present comes about because, unlike the other places we
912 ;;; use INVOKE-COMPLEX-SUBTYPEP-ARG1-METHOD, in HAIRY methods and the
913 ;;; like, classes are in their own hierarchy with no possibility of
914 ;;; mixtures with other type classes.
915 (!define-type-method
(classoid :complex-subtypep-arg2
) (type1 class2
)
916 (if (and (intersection-type-p type1
)
917 (> (count-if #'classoid-p
(intersection-type-types type1
)) 1))
919 (invoke-complex-subtypep-arg1-method type1 class2 nil t
)))
921 (!define-type-method
(classoid :negate
) (type)
922 (make-negation-type :type type
))
924 (!define-type-method
(classoid :unparse
) (type)
925 (classoid-proper-name type
))
929 ;;; the CLASSOID that we use to represent type information for
930 ;;; STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS. The type system
931 ;;; side does not need to distinguish between STANDARD-CLASS and
932 ;;; FUNCALLABLE-STANDARD-CLASS.
933 (def!struct
(standard-classoid (:include classoid
)
934 (:constructor make-standard-classoid
)))
935 ;;; a metaclass for classes which aren't standardlike but will never
937 (def!struct
(static-classoid (:include classoid
)
938 (:constructor make-static-classoid
)))
940 ;;;; built-in classes
942 ;;; The BUILT-IN-CLASSES list is a data structure which configures the
943 ;;; creation of all the built-in classes. It contains all the info
944 ;;; that we need to maintain the mapping between classes, compile-time
945 ;;; types and run-time type codes. These options are defined:
947 ;;; :TRANSLATION (default none)
948 ;;; When this class is "parsed" as a type specifier, it is
949 ;;; translated into the specified internal type representation,
950 ;;; rather than being left as a class. This is used for types
951 ;;; which we want to canonicalize to some other kind of type
952 ;;; object because in general we want to be able to include more
953 ;;; information than just the class (e.g. for numeric types.)
955 ;;; :ENUMERABLE (default NIL)
956 ;;; The value of the :ENUMERABLE slot in the created class.
957 ;;; Meaningless in translated classes.
959 ;;; :STATE (default :SEALED)
960 ;;; The value of CLASS-STATE which we want on completion,
961 ;;; indicating whether subclasses can be created at run-time.
963 ;;; :HIERARCHICAL-P (default T unless any of the inherits are non-hierarchical)
964 ;;; True if we can assign this class a unique inheritance depth.
966 ;;; :CODES (default none)
967 ;;; Run-time type codes which should be translated back to this
968 ;;; class by CLASS-OF. Unspecified for abstract classes.
970 ;;; :INHERITS (default this class and T)
971 ;;; The class-precedence list for this class, with this class and
974 ;;; :DIRECT-SUPERCLASSES (default to head of CPL)
975 ;;; List of the direct superclasses of this class.
977 ;;; FIXME: This doesn't seem to be needed after cold init (and so can
978 ;;; probably be uninterned at the end of cold init).
979 (defvar *built-in-classes
*)
981 (/show0
"setting *BUILT-IN-CLASSES*")
984 '((t :state
:read-only
:translation t
)
985 (character :enumerable t
986 :codes
(#.sb
!vm
:character-widetag
)
987 :translation
(character-set)
988 :prototype-form
(code-char 42))
989 (symbol :codes
(#.sb
!vm
:symbol-header-widetag
)
990 :prototype-form
'#:mu
)
992 (system-area-pointer :codes
(#.sb
!vm
:sap-widetag
)
993 :prototype-form
(sb!sys
:int-sap
42))
994 (weak-pointer :codes
(#.sb
!vm
:weak-pointer-widetag
)
995 :prototype-form
(sb!ext
:make-weak-pointer
(find-package "CL")))
996 (code-component :codes
(#.sb
!vm
:code-header-widetag
))
997 (lra :codes
(#.sb
!vm
:return-pc-header-widetag
))
998 (fdefn :codes
(#.sb
!vm
:fdefn-widetag
)
999 :prototype-form
(sb!kernel
:make-fdefn
"42"))
1000 (random-class) ; used for unknown type codes
1003 :codes
(#.sb
!vm
:closure-header-widetag
1004 #.sb
!vm
:simple-fun-header-widetag
)
1006 :prototype-form
(function (lambda () 42)))
1008 (number :translation number
)
1010 :translation complex
1012 :codes
(#.sb
!vm
:complex-widetag
)
1013 :prototype-form
(complex 42 42))
1014 (complex-single-float
1015 :translation
(complex single-float
)
1016 :inherits
(complex number
)
1017 :codes
(#.sb
!vm
:complex-single-float-widetag
)
1018 :prototype-form
(complex 42f0
42f0
))
1019 (complex-double-float
1020 :translation
(complex double-float
)
1021 :inherits
(complex number
)
1022 :codes
(#.sb
!vm
:complex-double-float-widetag
)
1023 :prototype-form
(complex 42d0
42d0
))
1026 :translation
(complex long-float
)
1027 :inherits
(complex number
)
1028 :codes
(#.sb
!vm
:complex-long-float-widetag
)
1029 :prototype-form
(complex 42l0 42l0))
1030 (real :translation real
:inherits
(number))
1033 :inherits
(real number
))
1035 :translation single-float
1036 :inherits
(float real number
)
1037 :codes
(#.sb
!vm
:single-float-widetag
)
1038 :prototype-form
42f0
)
1040 :translation double-float
1041 :inherits
(float real number
)
1042 :codes
(#.sb
!vm
:double-float-widetag
)
1043 :prototype-form
42d0
)
1046 :translation long-float
1047 :inherits
(float real number
)
1048 :codes
(#.sb
!vm
:long-float-widetag
)
1049 :prototype-form
42l0)
1051 :translation rational
1052 :inherits
(real number
))
1054 :translation
(and rational
(not integer
))
1055 :inherits
(rational real number
)
1056 :codes
(#.sb
!vm
:ratio-widetag
)
1057 :prototype-form
1/42)
1059 :translation integer
1060 :inherits
(rational real number
))
1062 :translation
(integer #.sb
!xc
:most-negative-fixnum
1063 #.sb
!xc
:most-positive-fixnum
)
1064 :inherits
(integer rational real number
)
1065 :codes
(#.sb
!vm
:even-fixnum-lowtag
#.sb
!vm
:odd-fixnum-lowtag
)
1068 :translation
(and integer
(not fixnum
))
1069 :inherits
(integer rational real number
)
1070 :codes
(#.sb
!vm
:bignum-widetag
)
1071 :prototype-form
(expt 2 #.
(* sb
!vm
:n-word-bits
(/ 3 2))))
1073 (array :translation array
:codes
(#.sb
!vm
:complex-array-widetag
)
1075 :prototype-form
(make-array nil
:adjustable t
))
1077 :translation simple-array
:codes
(#.sb
!vm
:simple-array-widetag
)
1079 :prototype-form
(make-array nil
))
1081 :translation
(or cons
(member nil
) vector extended-sequence
)
1085 :translation vector
:codes
(#.sb
!vm
:complex-vector-widetag
)
1086 :direct-superclasses
(array sequence
)
1087 :inherits
(array sequence
))
1089 :translation simple-vector
:codes
(#.sb
!vm
:simple-vector-widetag
)
1090 :direct-superclasses
(vector simple-array
)
1091 :inherits
(vector simple-array array sequence
)
1092 :prototype-form
(make-array 0))
1094 :translation bit-vector
:codes
(#.sb
!vm
:complex-bit-vector-widetag
)
1095 :inherits
(vector array sequence
)
1096 :prototype-form
(make-array 0 :element-type
'bit
:fill-pointer t
))
1098 :translation simple-bit-vector
:codes
(#.sb
!vm
:simple-bit-vector-widetag
)
1099 :direct-superclasses
(bit-vector simple-array
)
1100 :inherits
(bit-vector vector simple-array
1102 :prototype-form
(make-array 0 :element-type
'bit
))
1103 (simple-array-unsigned-byte-2
1104 :translation
(simple-array (unsigned-byte 2) (*))
1105 :codes
(#.sb
!vm
:simple-array-unsigned-byte-2-widetag
)
1106 :direct-superclasses
(vector simple-array
)
1107 :inherits
(vector simple-array array sequence
)
1108 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 2)))
1109 (simple-array-unsigned-byte-4
1110 :translation
(simple-array (unsigned-byte 4) (*))
1111 :codes
(#.sb
!vm
:simple-array-unsigned-byte-4-widetag
)
1112 :direct-superclasses
(vector simple-array
)
1113 :inherits
(vector simple-array array sequence
)
1114 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 4)))
1115 (simple-array-unsigned-byte-7
1116 :translation
(simple-array (unsigned-byte 7) (*))
1117 :codes
(#.sb
!vm
:simple-array-unsigned-byte-7-widetag
)
1118 :direct-superclasses
(vector simple-array
)
1119 :inherits
(vector simple-array array sequence
)
1120 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 7)))
1121 (simple-array-unsigned-byte-8
1122 :translation
(simple-array (unsigned-byte 8) (*))
1123 :codes
(#.sb
!vm
:simple-array-unsigned-byte-8-widetag
)
1124 :direct-superclasses
(vector simple-array
)
1125 :inherits
(vector simple-array array sequence
)
1126 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 8)))
1127 (simple-array-unsigned-byte-15
1128 :translation
(simple-array (unsigned-byte 15) (*))
1129 :codes
(#.sb
!vm
:simple-array-unsigned-byte-15-widetag
)
1130 :direct-superclasses
(vector simple-array
)
1131 :inherits
(vector simple-array array sequence
)
1132 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 15)))
1133 (simple-array-unsigned-byte-16
1134 :translation
(simple-array (unsigned-byte 16) (*))
1135 :codes
(#.sb
!vm
:simple-array-unsigned-byte-16-widetag
)
1136 :direct-superclasses
(vector simple-array
)
1137 :inherits
(vector simple-array array sequence
)
1138 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 16)))
1139 #!+#.
(cl:if
(cl:= 32 sb
!vm
:n-word-bits
) '(and) '(or))
1140 (simple-array-unsigned-byte-29
1141 :translation
(simple-array (unsigned-byte 29) (*))
1142 :codes
(#.sb
!vm
:simple-array-unsigned-byte-29-widetag
)
1143 :direct-superclasses
(vector simple-array
)
1144 :inherits
(vector simple-array array sequence
)
1145 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 29)))
1146 (simple-array-unsigned-byte-31
1147 :translation
(simple-array (unsigned-byte 31) (*))
1148 :codes
(#.sb
!vm
:simple-array-unsigned-byte-31-widetag
)
1149 :direct-superclasses
(vector simple-array
)
1150 :inherits
(vector simple-array array sequence
)
1151 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 31)))
1152 (simple-array-unsigned-byte-32
1153 :translation
(simple-array (unsigned-byte 32) (*))
1154 :codes
(#.sb
!vm
:simple-array-unsigned-byte-32-widetag
)
1155 :direct-superclasses
(vector simple-array
)
1156 :inherits
(vector simple-array array sequence
)
1157 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 32)))
1158 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1159 (simple-array-unsigned-byte-60
1160 :translation
(simple-array (unsigned-byte 60) (*))
1161 :codes
(#.sb
!vm
:simple-array-unsigned-byte-60-widetag
)
1162 :direct-superclasses
(vector simple-array
)
1163 :inherits
(vector simple-array array sequence
)
1164 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 60)))
1165 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1166 (simple-array-unsigned-byte-63
1167 :translation
(simple-array (unsigned-byte 63) (*))
1168 :codes
(#.sb
!vm
:simple-array-unsigned-byte-63-widetag
)
1169 :direct-superclasses
(vector simple-array
)
1170 :inherits
(vector simple-array array sequence
)
1171 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 63)))
1172 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1173 (simple-array-unsigned-byte-64
1174 :translation
(simple-array (unsigned-byte 64) (*))
1175 :codes
(#.sb
!vm
:simple-array-unsigned-byte-64-widetag
)
1176 :direct-superclasses
(vector simple-array
)
1177 :inherits
(vector simple-array array sequence
)
1178 :prototype-form
(make-array 0 :element-type
'(unsigned-byte 64)))
1179 (simple-array-signed-byte-8
1180 :translation
(simple-array (signed-byte 8) (*))
1181 :codes
(#.sb
!vm
:simple-array-signed-byte-8-widetag
)
1182 :direct-superclasses
(vector simple-array
)
1183 :inherits
(vector simple-array array sequence
)
1184 :prototype-form
(make-array 0 :element-type
'(signed-byte 8)))
1185 (simple-array-signed-byte-16
1186 :translation
(simple-array (signed-byte 16) (*))
1187 :codes
(#.sb
!vm
:simple-array-signed-byte-16-widetag
)
1188 :direct-superclasses
(vector simple-array
)
1189 :inherits
(vector simple-array array sequence
)
1190 :prototype-form
(make-array 0 :element-type
'(signed-byte 16)))
1191 #!+#.
(cl:if
(cl:= 32 sb
!vm
:n-word-bits
) '(and) '(or))
1192 (simple-array-signed-byte-30
1193 :translation
(simple-array (signed-byte 30) (*))
1194 :codes
(#.sb
!vm
:simple-array-signed-byte-30-widetag
)
1195 :direct-superclasses
(vector simple-array
)
1196 :inherits
(vector simple-array array sequence
)
1197 :prototype-form
(make-array 0 :element-type
'(signed-byte 30)))
1198 (simple-array-signed-byte-32
1199 :translation
(simple-array (signed-byte 32) (*))
1200 :codes
(#.sb
!vm
:simple-array-signed-byte-32-widetag
)
1201 :direct-superclasses
(vector simple-array
)
1202 :inherits
(vector simple-array array sequence
)
1203 :prototype-form
(make-array 0 :element-type
'(signed-byte 32)))
1204 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1205 (simple-array-signed-byte-61
1206 :translation
(simple-array (signed-byte 61) (*))
1207 :codes
(#.sb
!vm
:simple-array-signed-byte-61-widetag
)
1208 :direct-superclasses
(vector simple-array
)
1209 :inherits
(vector simple-array array sequence
)
1210 :prototype-form
(make-array 0 :element-type
'(signed-byte 61)))
1211 #!+#.
(cl:if
(cl:= 64 sb
!vm
:n-word-bits
) '(and) '(or))
1212 (simple-array-signed-byte-64
1213 :translation
(simple-array (signed-byte 64) (*))
1214 :codes
(#.sb
!vm
:simple-array-signed-byte-64-widetag
)
1215 :direct-superclasses
(vector simple-array
)
1216 :inherits
(vector simple-array array sequence
)
1217 :prototype-form
(make-array 0 :element-type
'(signed-byte 64)))
1218 (simple-array-single-float
1219 :translation
(simple-array single-float
(*))
1220 :codes
(#.sb
!vm
:simple-array-single-float-widetag
)
1221 :direct-superclasses
(vector simple-array
)
1222 :inherits
(vector simple-array array sequence
)
1223 :prototype-form
(make-array 0 :element-type
'single-float
))
1224 (simple-array-double-float
1225 :translation
(simple-array double-float
(*))
1226 :codes
(#.sb
!vm
:simple-array-double-float-widetag
)
1227 :direct-superclasses
(vector simple-array
)
1228 :inherits
(vector simple-array array sequence
)
1229 :prototype-form
(make-array 0 :element-type
'double-float
))
1231 (simple-array-long-float
1232 :translation
(simple-array long-float
(*))
1233 :codes
(#.sb
!vm
:simple-array-long-float-widetag
)
1234 :direct-superclasses
(vector simple-array
)
1235 :inherits
(vector simple-array array sequence
)
1236 :prototype-form
(make-array 0 :element-type
'long-float
))
1237 (simple-array-complex-single-float
1238 :translation
(simple-array (complex single-float
) (*))
1239 :codes
(#.sb
!vm
:simple-array-complex-single-float-widetag
)
1240 :direct-superclasses
(vector simple-array
)
1241 :inherits
(vector simple-array array sequence
)
1242 :prototype-form
(make-array 0 :element-type
'(complex single-float
)))
1243 (simple-array-complex-double-float
1244 :translation
(simple-array (complex double-float
) (*))
1245 :codes
(#.sb
!vm
:simple-array-complex-double-float-widetag
)
1246 :direct-superclasses
(vector simple-array
)
1247 :inherits
(vector simple-array array sequence
)
1248 :prototype-form
(make-array 0 :element-type
'(complex double-float
)))
1250 (simple-array-complex-long-float
1251 :translation
(simple-array (complex long-float
) (*))
1252 :codes
(#.sb
!vm
:simple-array-complex-long-float-widetag
)
1253 :direct-superclasses
(vector simple-array
)
1254 :inherits
(vector simple-array array sequence
)
1255 :prototype-form
(make-array 0 :element-type
'(complex long-float
)))
1258 :direct-superclasses
(vector)
1259 :inherits
(vector array sequence
))
1261 :translation simple-string
1262 :direct-superclasses
(string simple-array
)
1263 :inherits
(string vector simple-array array sequence
))
1265 :translation
(vector nil
)
1266 :codes
(#.sb
!vm
:complex-vector-nil-widetag
)
1267 :direct-superclasses
(string)
1268 :inherits
(string vector array sequence
)
1269 :prototype-form
(make-array 0 :element-type
'nil
:fill-pointer t
))
1271 :translation
(simple-array nil
(*))
1272 :codes
(#.sb
!vm
:simple-array-nil-widetag
)
1273 :direct-superclasses
(vector-nil simple-string
)
1274 :inherits
(vector-nil simple-string string vector simple-array
1276 :prototype-form
(make-array 0 :element-type
'nil
))
1278 :translation base-string
1279 :codes
(#.sb
!vm
:complex-base-string-widetag
)
1280 :direct-superclasses
(string)
1281 :inherits
(string vector array sequence
)
1282 :prototype-form
(make-array 0 :element-type
'base-char
:fill-pointer t
))
1284 :translation simple-base-string
1285 :codes
(#.sb
!vm
:simple-base-string-widetag
)
1286 :direct-superclasses
(base-string simple-string
)
1287 :inherits
(base-string simple-string string vector simple-array
1289 :prototype-form
(make-array 0 :element-type
'base-char
))
1292 :translation
(vector character
)
1293 :codes
(#.sb
!vm
:complex-character-string-widetag
)
1294 :direct-superclasses
(string)
1295 :inherits
(string vector array sequence
)
1296 :prototype-form
(make-array 0 :element-type
'character
:fill-pointer t
))
1298 (simple-character-string
1299 :translation
(simple-array character
(*))
1300 :codes
(#.sb
!vm
:simple-character-string-widetag
)
1301 :direct-superclasses
(character-string simple-string
)
1302 :inherits
(character-string simple-string string vector simple-array
1304 :prototype-form
(make-array 0 :element-type
'character
))
1306 :translation
(or cons
(member nil
))
1307 :inherits
(sequence))
1309 :codes
(#.sb
!vm
:list-pointer-lowtag
)
1311 :inherits
(list sequence
)
1312 :prototype-form
(cons nil nil
))
1314 :translation
(member nil
)
1315 :inherits
(symbol list sequence
)
1316 :direct-superclasses
(symbol list
)
1317 :prototype-form
'nil
)
1328 :inherits
(stream)))))
1330 ;;; See also src/code/class-init.lisp where we finish setting up the
1331 ;;; translations for built-in types.
1333 (dolist (x *built-in-classes
*)
1334 #-sb-xc-host
(/show0
"at head of loop over *BUILT-IN-CLASSES*")
1337 (translation nil trans-p
)
1344 (hierarchical-p t
) ; might be modified below
1345 (direct-superclasses (if inherits
1346 (list (car inherits
))
1349 (declare (ignore codes state translation prototype-form
))
1350 (let ((inherits-list (if (eq name t
)
1352 (cons t
(reverse inherits
))))
1353 (classoid (make-built-in-classoid
1354 :enumerable enumerable
1356 :translation
(if trans-p
:initializing nil
)
1357 :direct-superclasses
1360 (mapcar #'find-classoid direct-superclasses
)))))
1361 (setf (info :type
:kind name
) #+sb-xc-host
:defined
#-sb-xc-host
:primitive
1362 (classoid-cell-classoid (find-classoid-cell name
)) classoid
)
1364 (setf (info :type
:builtin name
) classoid
))
1365 (let* ((inherits-vector
1369 (classoid-layout (find-classoid x
))))
1370 (when (minusp (layout-depthoid super-layout
))
1371 (setf hierarchical-p nil
))
1374 (depthoid (if hierarchical-p
1375 (or depth
(length inherits-vector
))
1378 (find-and-init-or-check-layout name
1383 :invalidate nil
)))))
1384 (/show0
"done with loop over *BUILT-IN-CLASSES*"))
1386 ;;; Define temporary PCL STANDARD-CLASSes. These will be set up
1387 ;;; correctly and the Lisp layout replaced by a PCL wrapper after PCL
1388 ;;; is loaded and the class defined.
1390 (/show0
"about to define temporary STANDARD-CLASSes")
1391 (dolist (x '(;; Why is STREAM duplicated in this list? Because, when
1392 ;; the inherits-vector of FUNDAMENTAL-STREAM is set up,
1393 ;; a vector containing the elements of the list below,
1394 ;; i.e. '(T STREAM STREAM), is created, and
1395 ;; this is what the function ORDER-LAYOUT-INHERITS
1398 ;; So, the purpose is to guarantee a valid layout for
1399 ;; the FUNDAMENTAL-STREAM class, matching what
1400 ;; ORDER-LAYOUT-INHERITS would do.
1401 ;; ORDER-LAYOUT-INHERITS would place STREAM at index 2
1402 ;; in the INHERITS(-VECTOR). Index 1 would not be
1403 ;; filled, so STREAM is duplicated there (as
1404 ;; ORDER-LAYOUTS-INHERITS would do). Maybe the
1405 ;; duplicate definition could be removed (removing a
1406 ;; STREAM element), because FUNDAMENTAL-STREAM is
1407 ;; redefined after PCL is set up, anyway. But to play
1408 ;; it safely, we define the class with a valid INHERITS
1410 (fundamental-stream (t stream stream
))))
1411 (/show0
"defining temporary STANDARD-CLASS")
1412 (let* ((name (first x
))
1413 (inherits-list (second x
))
1414 (classoid (make-standard-classoid :name name
))
1415 (classoid-cell (find-classoid-cell name
)))
1416 ;; Needed to open-code the MAP, below
1417 (declare (type list inherits-list
))
1418 (setf (classoid-cell-classoid classoid-cell
) classoid
1419 (info :type
:classoid name
) classoid-cell
1420 (info :type
:kind name
) :instance
)
1421 (let ((inherits (map 'simple-vector
1423 (classoid-layout (find-classoid x
)))
1425 #-sb-xc-host
(/show0
"INHERITS=..") #-sb-xc-host
(/hexstr inherits
)
1426 (register-layout (find-and-init-or-check-layout name
0 inherits -
1 0)
1428 (/show0
"done defining temporary STANDARD-CLASSes"))
1430 ;;; Now that we have set up the class heterarchy, seal the sealed
1431 ;;; classes. This must be done after the subclasses have been set up.
1433 (dolist (x *built-in-classes
*)
1434 (destructuring-bind (name &key
(state :sealed
) &allow-other-keys
) x
1435 (setf (classoid-state (find-classoid name
)) state
))))
1437 ;;;; class definition/redefinition
1439 ;;; This is to be called whenever we are altering a class.
1440 (defun modify-classoid (classoid)
1442 (when (member (classoid-state classoid
) '(:read-only
:frozen
))
1443 ;; FIXME: This should probably be CERROR.
1444 (warn "making ~(~A~) class ~S writable"
1445 (classoid-state classoid
)
1446 (classoid-name classoid
))
1447 (setf (classoid-state classoid
) nil
)))
1449 ;;; Mark LAYOUT as invalid. Setting DEPTHOID -1 helps cause unsafe
1450 ;;; structure type tests to fail. Remove class from all superclasses
1451 ;;; too (might not be registered, so might not be in subclasses of the
1452 ;;; nominal superclasses.) We set the layout-clos-hash slots to 0 to
1453 ;;; invalidate the wrappers for specialized dispatch functions, which
1454 ;;; use those slots as indexes into tables.
1455 (defun invalidate-layout (layout)
1456 (declare (type layout layout
))
1457 (setf (layout-invalid layout
) t
1458 (layout-depthoid layout
) -
1)
1459 (setf (layout-clos-hash layout
) 0)
1460 (let ((inherits (layout-inherits layout
))
1461 (classoid (layout-classoid layout
)))
1462 (modify-classoid classoid
)
1463 (dovector (super inherits
)
1464 (let ((subs (classoid-subclasses (layout-classoid super
))))
1466 (remhash classoid subs
)))))
1469 ;;;; cold loading initializations
1471 ;;; FIXME: It would be good to arrange for this to be called when the
1472 ;;; cross-compiler is being built, not just when the target Lisp is
1473 ;;; being cold loaded. Perhaps this could be moved to its own file
1474 ;;; late in the build-order.lisp-expr sequence, and be put in
1475 ;;; !COLD-INIT-FORMS there?
1476 (defun !class-finalize
()
1477 (dohash (name layout
*forward-referenced-layouts
*)
1478 (let ((class (find-classoid name nil
)))
1480 (setf (layout-classoid layout
) (make-undefined-classoid name
)))
1481 ((eq (classoid-layout class
) layout
)
1482 (remhash name
*forward-referenced-layouts
*))
1485 (warn "something strange with forward layout for ~S:~% ~S"
1490 #-sb-xc-host
(/show0
"about to set *BUILT-IN-CLASS-CODES*")
1491 (setq *built-in-class-codes
*
1492 (let* ((initial-element
1494 ;; KLUDGE: There's a FIND-CLASSOID DEFTRANSFORM for
1495 ;; constant class names which creates fast but
1496 ;; non-cold-loadable, non-compact code. In this
1497 ;; context, we'd rather have compact, cold-loadable
1498 ;; code. -- WHN 19990928
1499 (declare (notinline find-classoid
))
1500 (classoid-layout (find-classoid 'random-class
))))
1501 (res (make-array 256 :initial-element initial-element
)))
1502 (dolist (x *built-in-classes
* res
)
1503 (destructuring-bind (name &key codes
&allow-other-keys
)
1505 (let ((layout (classoid-layout (find-classoid name
))))
1506 (dolist (code codes
)
1507 (setf (svref res code
) layout
)))))))
1508 (setq *null-classoid-layout
*
1509 ;; KLUDGE: we use (LET () ...) instead of a LOCALLY here to
1510 ;; work around a bug in the LOCALLY handling in the fopcompiler
1511 ;; (present in 0.9.13-0.9.14.18). -- JES, 2006-07-16
1513 (declare (notinline find-classoid
))
1514 (classoid-layout (find-classoid 'null
))))
1515 #-sb-xc-host
(/show0
"done setting *BUILT-IN-CLASS-CODES*"))
1517 (!defun-from-collected-cold-init-forms
!classes-cold-init
)