1 ;;;; This software is part of the SBCL system. See the README file for
4 ;;;; This software is derived from the CMU CL system, which was
5 ;;;; written at Carnegie Mellon University and released into the
6 ;;;; public domain. The software is in the public domain and is
7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
8 ;;;; files for more information.
10 (in-package "SB!KERNEL")
12 (!begin-collecting-cold-init-forms)
14 ;;;; representations of types
16 ;;; A HAIRY-TYPE represents anything too weird to be described
17 ;;; reasonably or to be useful, such as NOT, SATISFIES, unknown types,
18 ;;; and unreasonably complicated types involving AND. We just remember
19 ;;; the original type spec.
20 (defstruct (hairy-type (:include ctype
21 (class-info (type-class-or-lose 'hairy))
23 (might-contain-other-types-p t))
26 ;; the Common Lisp type-specifier of the type we represent
27 (specifier nil :type t))
29 (!define-type-class hairy)
31 ;;; An UNKNOWN-TYPE is a type not known to the type system (not yet
32 ;;; defined). We make this distinction since we don't want to complain
33 ;;; about types that are hairy but defined.
34 (defstruct (unknown-type (:include hairy-type)
37 (defstruct (negation-type (:include ctype
38 (class-info (type-class-or-lose 'negation))
39 ;; FIXME: is this right? It's
40 ;; what they had before, anyway
42 (might-contain-other-types-p t))
45 (type (missing-arg) :type ctype))
47 (!define-type-class negation)
49 ;;; ARGS-TYPE objects are used both to represent VALUES types and
50 ;;; to represent FUNCTION types.
51 (defstruct (args-type (:include ctype)
54 ;; Lists of the type for each required and optional argument.
55 (required nil :type list)
56 (optional nil :type list)
57 ;; The type for the rest arg. NIL if there is no &REST arg.
58 (rest nil :type (or ctype null))
59 ;; true if &KEY arguments are specified
60 (keyp nil :type boolean)
61 ;; list of KEY-INFO structures describing the &KEY arguments
62 (keywords nil :type list)
63 ;; true if other &KEY arguments are allowed
64 (allowp nil :type boolean))
66 (defun canonicalize-args-type-args (required optional rest &optional keyp)
67 (when (eq rest *empty-type*)
70 (loop with last-not-rest = nil
73 do (cond ((eq opt *empty-type*)
74 (return (values required (subseq optional i) rest)))
75 ((and (not keyp) (neq opt rest))
76 (setq last-not-rest i)))
77 finally (return (values required
81 (subseq optional 0 (1+ last-not-rest))))
84 (defun args-types (lambda-list-like-thing)
86 (required optional restp rest keyp keys allowp auxp aux
87 morep more-context more-count llk-p)
88 (parse-lambda-list-like-thing lambda-list-like-thing :silent t)
89 (declare (ignore aux morep more-context more-count))
91 (error "&AUX in a FUNCTION or VALUES type: ~S." lambda-list-like-thing))
92 (let ((required (mapcar #'single-value-specifier-type required))
93 (optional (mapcar #'single-value-specifier-type optional))
94 (rest (when restp (single-value-specifier-type rest)))
98 (unless (proper-list-of-length-p key 2)
99 (error "Keyword type description is not a two-list: ~S." key))
100 (let ((kwd (first key)))
101 (when (find kwd (key-info) :key #'key-info-name)
102 (error "~@<repeated keyword ~S in lambda list: ~2I~_~S~:>"
103 kwd lambda-list-like-thing))
107 :type (single-value-specifier-type (second key))))))
109 (multiple-value-bind (required optional rest)
110 (canonicalize-args-type-args required optional rest keyp)
111 (values required optional rest keyp keywords allowp llk-p)))))
113 (defstruct (values-type
115 (class-info (type-class-or-lose 'values)))
116 (:constructor %make-values-type)
119 (defun-cached (make-values-type-cached
121 :hash-function (lambda (req opt rest allowp)
123 (type-list-cache-hash req)
124 (type-list-cache-hash opt)
126 (type-hash-value rest)
130 ((required equal-but-no-car-recursion)
131 (optional equal-but-no-car-recursion)
134 (%make-values-type :required required
139 (defun make-values-type (&key (args nil argsp)
140 required optional rest allowp)
144 (multiple-value-bind (required optional rest keyp keywords allowp
147 (declare (ignore keywords))
149 (error "&KEY appeared in a VALUES type specifier ~S."
152 (make-values-type :required required
156 (make-short-values-type required))))
157 (multiple-value-bind (required optional rest)
158 (canonicalize-args-type-args required optional rest)
159 (cond ((and (null required)
161 (eq rest *universal-type*))
163 ((memq *empty-type* required)
165 (t (make-values-type-cached required optional
168 (!define-type-class values)
170 ;;; (SPECIFIER-TYPE 'FUNCTION) and its subtypes
171 (defstruct (fun-type (:include args-type
172 (class-info (type-class-or-lose 'function)))
174 %make-fun-type (&key required optional rest
178 &aux (rest (if (eq rest *empty-type*)
181 ;; true if the arguments are unrestrictive, i.e. *
182 (wild-args nil :type boolean)
183 ;; type describing the return values. This is a values type
184 ;; when multiple values were specified for the return.
185 (returns (missing-arg) :type ctype))
186 (defun make-fun-type (&rest initargs
187 &key (args nil argsp) returns &allow-other-keys)
190 (if (eq returns *wild-type*)
191 (specifier-type 'function)
192 (%make-fun-type :wild-args t :returns returns))
193 (multiple-value-bind (required optional rest keyp keywords allowp)
195 (if (and (null required)
197 (eq rest *universal-type*)
199 (if (eq returns *wild-type*)
200 (specifier-type 'function)
201 (%make-fun-type :wild-args t :returns returns))
202 (%make-fun-type :required required
209 ;; FIXME: are we really sure that we won't make something that
210 ;; looks like a completely wild function here?
211 (apply #'%make-fun-type initargs)))
213 ;;; The CONSTANT-TYPE structure represents a use of the CONSTANT-ARG
214 ;;; "type specifier", which is only meaningful in function argument
215 ;;; type specifiers used within the compiler. (It represents something
216 ;;; that the compiler knows to be a constant.)
217 (defstruct (constant-type
219 (class-info (type-class-or-lose 'constant)))
221 ;; The type which the argument must be a constant instance of for this type
223 (type (missing-arg) :type ctype))
225 ;;; The NAMED-TYPE is used to represent *, T and NIL, the standard
226 ;;; special cases, as well as other special cases needed to
227 ;;; interpolate between regions of the type hierarchy, such as
228 ;;; INSTANCE (which corresponds to all those classes with slots which
229 ;;; are not funcallable), FUNCALLABLE-INSTANCE (those classes with
230 ;;; slots which are funcallable) and EXTENDED-SEQUUENCE (non-LIST
231 ;;; non-VECTOR classes which are also sequences). These special cases
232 ;;; are the ones that aren't really discussed by Baker in his
233 ;;; "Decision Procedure for SUBTYPEP" paper.
234 (defstruct (named-type (:include ctype
235 (class-info (type-class-or-lose 'named)))
237 (name nil :type symbol))
239 ;;; a list of all the float "formats" (i.e. internal representations;
240 ;;; nothing to do with #'FORMAT), in order of decreasing precision
241 (eval-when (:compile-toplevel :load-toplevel :execute)
242 (defparameter *float-formats*
243 '(long-float double-float single-float short-float)))
245 ;;; The type of a float format.
246 (deftype float-format () `(member ,@*float-formats*))
248 ;;; A NUMERIC-TYPE represents any numeric type, including things
250 (defstruct (numeric-type (:include ctype
251 (class-info (type-class-or-lose 'number)))
252 (:constructor %make-numeric-type)
254 ;; the kind of numeric type we have, or NIL if not specified (just
255 ;; NUMBER or COMPLEX)
257 ;; KLUDGE: A slot named CLASS for a non-CLASS value is bad.
258 ;; Especially when a CLASS value *is* stored in another slot (called
259 ;; CLASS-INFO:-). Perhaps this should be called CLASS-NAME? Also
260 ;; weird that comment above says "Numeric-Type is used to represent
261 ;; all numeric types" but this slot doesn't allow COMPLEX as an
262 ;; option.. how does this fall into "not specified" NIL case above?
263 ;; Perhaps someday we can switch to CLOS and make NUMERIC-TYPE
264 ;; be an abstract base class and INTEGER-TYPE, RATIONAL-TYPE, and
265 ;; whatnot be concrete subclasses..
266 (class nil :type (member integer rational float nil) :read-only t)
267 ;; "format" for a float type (i.e. type specifier for a CPU
268 ;; representation of floating point, e.g. 'SINGLE-FLOAT -- nothing
269 ;; to do with #'FORMAT), or NIL if not specified or not a float.
270 ;; Formats which don't exist in a given implementation don't appear
272 (format nil :type (or float-format null) :read-only t)
273 ;; Is this a complex numeric type? Null if unknown (only in NUMBER).
275 ;; FIXME: I'm bewildered by FOO-P names for things not intended to
276 ;; interpreted as truth values. Perhaps rename this COMPLEXNESS?
277 (complexp :real :type (member :real :complex nil) :read-only t)
278 ;; The upper and lower bounds on the value, or NIL if there is no
279 ;; bound. If a list of a number, the bound is exclusive. Integer
280 ;; types never have exclusive bounds, i.e. they may have them on
281 ;; input, but they're canonicalized to inclusive bounds before we
283 (low nil :type (or number cons null) :read-only t)
284 (high nil :type (or number cons null) :read-only t))
286 ;;; Impose canonicalization rules for NUMERIC-TYPE. Note that in some
287 ;;; cases, despite the name, we return *EMPTY-TYPE* instead of a
289 (defun make-numeric-type (&key class format (complexp :real) low high
291 ;; if interval is empty
294 (if (or (consp low) (consp high)) ; if either bound is exclusive
295 (>= (type-bound-number low) (type-bound-number high))
298 (multiple-value-bind (canonical-low canonical-high)
301 ;; INTEGER types always have their LOW and HIGH bounds
302 ;; represented as inclusive, not exclusive values.
303 (values (if (consp low)
304 (1+ (type-bound-number low))
307 (1- (type-bound-number high))
310 ;; no canonicalization necessary
312 (when (and (eq class 'rational)
313 (integerp canonical-low)
314 (integerp canonical-high)
315 (= canonical-low canonical-high))
316 (setf class 'integer))
317 (%make-numeric-type :class class
322 :enumerable enumerable))))
324 (defun modified-numeric-type (base
326 (class (numeric-type-class base))
327 (format (numeric-type-format base))
328 (complexp (numeric-type-complexp base))
329 (low (numeric-type-low base))
330 (high (numeric-type-high base))
331 (enumerable (numeric-type-enumerable base)))
332 (make-numeric-type :class class
337 :enumerable enumerable))
339 (defstruct (character-set-type
341 (class-info (type-class-or-lose 'character-set)))
342 (:constructor %make-character-set-type)
344 (pairs (missing-arg) :type list :read-only t))
345 (defun make-character-set-type (&key pairs)
346 ; (aver (equal (mapcar #'car pairs)
347 ; (sort (mapcar #'car pairs) #'<)))
348 ;; aver that the cars of the list elements are sorted into increasing order
349 (aver (or (null pairs)
350 (do ((p pairs (cdr p)))
352 (when (> (caar p) (caadr p)) (return nil)))))
353 (let ((pairs (let (result)
354 (do ((pairs pairs (cdr pairs)))
355 ((null pairs) (nreverse result))
356 (destructuring-bind (low . high) (car pairs)
357 (loop for (low1 . high1) in (cdr pairs)
358 if (<= low1 (1+ high))
359 do (progn (setf high (max high high1))
360 (setf pairs (cdr pairs)))
361 else do (return nil))
363 ((>= low sb!xc:char-code-limit))
365 (t (push (cons (max 0 low)
366 (min high (1- sb!xc:char-code-limit)))
370 (%make-character-set-type :pairs pairs))))
372 ;;; An ARRAY-TYPE is used to represent any array type, including
373 ;;; things such as SIMPLE-BASE-STRING.
374 (defstruct (array-type (:include ctype
375 (class-info (type-class-or-lose 'array)))
376 (:constructor %make-array-type)
378 ;; the dimensions of the array, or * if unspecified. If a dimension
379 ;; is unspecified, it is *.
380 (dimensions '* :type (or list (member *)))
381 ;; Is this not a simple array type? (:MAYBE means that we don't know.)
382 (complexp :maybe :type (member t nil :maybe))
383 ;; the element type as originally specified
384 (element-type (missing-arg) :type ctype)
385 ;; the element type as it is specialized in this implementation
386 (specialized-element-type *wild-type* :type ctype))
387 (define-cached-synonym make-array-type)
389 ;;; A MEMBER-TYPE represent a use of the MEMBER type specifier. We
390 ;;; bother with this at this level because MEMBER types are fairly
391 ;;; important and union and intersection are well defined.
392 (defstruct (member-type (:include ctype
393 (class-info (type-class-or-lose 'member))
396 (:constructor %make-member-type (xset fp-zeroes))
397 #-sb-xc-host (:pure nil))
398 (xset (missing-arg) :type xset)
399 (fp-zeroes (missing-arg) :type list))
400 (defun make-member-type (&key xset fp-zeroes members)
402 (aver (not fp-zeroes))
403 (setf xset (alloc-xset))
404 (dolist (elt members)
406 (pushnew elt fp-zeroes)
407 (add-to-xset elt xset))))
408 ;; if we have a pair of zeros (e.g. 0.0d0 and -0.0d0), then we can
409 ;; canonicalize to (DOUBLE-FLOAT 0.0d0 0.0d0), because numeric
410 ;; ranges are compared by arithmetic operators (while MEMBERship is
411 ;; compared by EQL). -- CSR, 2003-04-23
414 (do ((tail (cdr fp-zeroes) (cdr tail))
415 (zero (car fp-zeroes) (car tail)))
418 `(let ((neg (neg-fp-zero zero)))
419 (if (member neg tail)
420 (push (ctype-of ,c) union-types)
421 (push zero unpaired)))))
423 (single-float (frob 0.0f0))
424 (double-float (frob 0.0d0))
426 (long-float (frob 0.0l0)))))
427 ;; The actual member-type contains the XSET (with no FP zeroes),
428 ;; and a list of unpaired zeroes.
429 (let ((member-type (unless (and (xset-empty-p xset) (not unpaired))
430 (%make-member-type xset unpaired))))
432 (make-union-type t (if member-type
433 (cons member-type union-types)
440 (defun member-type-size (type)
441 (+ (length (member-type-fp-zeroes type))
442 (xset-count (member-type-xset type))))
444 (defun member-type-member-p (x type)
446 (and (member x (member-type-fp-zeroes type)) t)
447 (xset-member-p x (member-type-xset type))))
449 (defun mapcar-member-type-members (function type)
450 (declare (function function))
452 (map-xset (lambda (x)
453 (results (funcall function x)))
454 (member-type-xset type))
455 (dolist (zero (member-type-fp-zeroes type))
456 (results (funcall function zero)))
459 (defun mapc-member-type-members (function type)
460 (declare (function function))
461 (map-xset function (member-type-xset type))
462 (dolist (zero (member-type-fp-zeroes type))
463 (funcall function zero)))
465 (defun member-type-members (type)
466 (append (member-type-fp-zeroes type)
467 (xset-members (member-type-xset type))))
469 ;;; A COMPOUND-TYPE is a type defined out of a set of types, the
470 ;;; common parent of UNION-TYPE and INTERSECTION-TYPE.
471 (defstruct (compound-type (:include ctype
472 (might-contain-other-types-p t))
475 (types nil :type list :read-only t))
477 ;;; A UNION-TYPE represents a use of the OR type specifier which we
478 ;;; couldn't canonicalize to something simpler. Canonical form:
479 ;;; 1. All possible pairwise simplifications (using the UNION2 type
480 ;;; methods) have been performed. Thus e.g. there is never more
481 ;;; than one MEMBER-TYPE component. FIXME: As of sbcl-0.6.11.13,
482 ;;; this hadn't been fully implemented yet.
483 ;;; 2. There are never any UNION-TYPE components.
484 (defstruct (union-type (:include compound-type
485 (class-info (type-class-or-lose 'union)))
486 (:constructor %make-union-type (enumerable types))
488 (define-cached-synonym make-union-type)
490 ;;; An INTERSECTION-TYPE represents a use of the AND type specifier
491 ;;; which we couldn't canonicalize to something simpler. Canonical form:
492 ;;; 1. All possible pairwise simplifications (using the INTERSECTION2
493 ;;; type methods) have been performed. Thus e.g. there is never more
494 ;;; than one MEMBER-TYPE component.
495 ;;; 2. There are never any INTERSECTION-TYPE components: we've
496 ;;; flattened everything into a single INTERSECTION-TYPE object.
497 ;;; 3. There are never any UNION-TYPE components. Either we should
498 ;;; use the distributive rule to rearrange things so that
499 ;;; unions contain intersections and not vice versa, or we
500 ;;; should just punt to using a HAIRY-TYPE.
501 (defstruct (intersection-type (:include compound-type
502 (class-info (type-class-or-lose
504 (:constructor %make-intersection-type
508 ;;; Return TYPE converted to canonical form for a situation where the
509 ;;; "type" '* (which SBCL still represents as a type even though ANSI
510 ;;; CL defines it as a related but different kind of placeholder) is
511 ;;; equivalent to type T.
512 (defun type-*-to-t (type)
513 (if (type= type *wild-type*)
517 ;;; A CONS-TYPE is used to represent a CONS type.
518 (defstruct (cons-type (:include ctype (class-info (type-class-or-lose 'cons)))
520 %make-cons-type (car-type
523 ;; the CAR and CDR element types (to support ANSI (CONS FOO BAR) types)
525 ;; FIXME: Most or all other type structure slots could also be :READ-ONLY.
526 (car-type (missing-arg) :type ctype :read-only t)
527 (cdr-type (missing-arg) :type ctype :read-only t))
528 (defun make-cons-type (car-type cdr-type)
529 (aver (not (or (eq car-type *wild-type*)
530 (eq cdr-type *wild-type*))))
531 (if (or (eq car-type *empty-type*)
532 (eq cdr-type *empty-type*))
534 (%make-cons-type car-type cdr-type)))
536 (defun cons-type-length-info (type)
537 (declare (type cons-type type))
538 (do ((min 1 (1+ min))
539 (cdr (cons-type-cdr-type type) (cons-type-cdr-type cdr)))
540 ((not (cons-type-p cdr))
542 ((csubtypep cdr (specifier-type 'null))
544 ((csubtypep *universal-type* cdr)
546 ((type/= (type-intersection (specifier-type 'cons) cdr) *empty-type*)
548 ((type/= (type-intersection (specifier-type 'null) cdr) *empty-type*)
550 (t (values min :maybe))))
556 ;;; Return the type structure corresponding to a type specifier. We
557 ;;; pick off structure types as a special case.
559 ;;; Note: VALUES-SPECIFIER-TYPE-CACHE-CLEAR must be called whenever a
560 ;;; type is defined (or redefined).
561 (defun-cached (values-specifier-type
562 :hash-function (lambda (x)
563 (logand (sxhash x) #x3FF))
565 :init-wrapper !cold-init-forms)
566 ((orig equal-but-no-car-recursion))
567 (let ((u (uncross orig)))
568 (or (info :type :builtin u)
569 (let ((spec (type-expand u)))
571 ((and (not (eq spec u))
572 (info :type :builtin spec)))
573 ((eq (info :type :kind spec) :instance)
574 (find-classoid spec))
575 ((typep spec 'classoid)
576 (if (typep spec 'built-in-classoid)
577 (or (built-in-classoid-translation spec) spec)
580 (when (and (atom spec)
581 (member spec '(and or not member eql satisfies values)))
582 (error "The symbol ~S is not valid as a type specifier." spec))
583 (let* ((lspec (if (atom spec) (list spec) spec))
584 (fun (info :type :translator (car lspec))))
587 ((or (and (consp spec) (symbolp (car spec))
588 (not (info :type :builtin (car spec))))
589 (and (symbolp spec) (not (info :type :builtin spec))))
590 (when (and *type-system-initialized*
591 (not (eq (info :type :kind spec)
592 :forthcoming-defclass-type)))
593 (signal 'parse-unknown-type :specifier spec))
594 ;; (The RETURN-FROM here inhibits caching.)
595 (return-from values-specifier-type
596 (make-unknown-type :specifier spec)))
598 (error "bad thing to be a type specifier: ~S"
601 ;;; This is like VALUES-SPECIFIER-TYPE, except that we guarantee to
602 ;;; never return a VALUES type.
603 (defun specifier-type (x)
604 (let ((res (values-specifier-type x)))
605 (when (or (values-type-p res)
606 ;; bootstrap magic :-(
607 (and (named-type-p res)
608 (eq (named-type-name res) '*)))
609 (error "VALUES type illegal in this context:~% ~S" x))
612 (defun single-value-specifier-type (x)
617 ;;; Similar to MACROEXPAND, but expands DEFTYPEs. We don't bother
618 ;;; returning a second value.
619 (defun type-expand (form)
620 (let ((def (cond ((symbolp form)
621 (info :type :expander form))
622 ((and (consp form) (symbolp (car form)))
623 (info :type :expander (car form)))
626 (type-expand (funcall def (if (consp form) form (list form))))
629 ;;; Note that the type NAME has been (re)defined, updating the
630 ;;; undefined warnings and VALUES-SPECIFIER-TYPE cache.
631 (defun %note-type-defined (name)
632 (declare (symbol name))
633 (note-name-defined name :type)
634 (when (boundp 'sb!kernel::*values-specifier-type-cache-vector*)
635 (values-specifier-type-cache-clear))
639 (!defun-from-collected-cold-init-forms !early-type-cold-init)