1 ;;;; type-related stuff which exists only in the target SBCL runtime
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
12 (in-package "SB!KERNEL")
14 (!begin-collecting-cold-init-forms)
16 ;;; If TYPE is a type that we can do a compile-time test on, then
17 ;;; return whether the object is of that type as the first value and
18 ;;; second value true. Otherwise return NIL, NIL.
20 ;;; We give up on unknown types and pick off FUNCTION- and COMPOUND-
21 ;;; types. For STRUCTURE- types, we require that the type be defined
22 ;;; in both the current and compiler environments, and that the
23 ;;; INCLUDES be the same.
25 ;;; KLUDGE: This should probably be a type method instead of a big
26 ;;; ETYPECASE. But then the type method system should probably be CLOS
27 ;;; too, and until that happens wedging more stuff into it might be
28 ;;; messy. So I've left it a big ETYPECASE. -- 2001-03-16
29 (defun ctypep (obj type)
30 (declare (type ctype type))
38 (values (%typep obj type) t))
40 (if (if (csubtypep type (specifier-type 'funcallable-instance))
41 (funcallable-instance-p obj)
42 (typep obj 'instance))
43 (if (eq (class-layout type)
44 (info :type :compiler-layout (sb!xc:class-name type)))
45 (values (sb!xc:typep obj type) t)
49 (funcall (etypecase type
50 (intersection-type #'every/type)
51 (union-type #'any/type))
54 (compound-type-types type)))
56 (values (functionp obj) t))
60 (values (alien-typep obj (alien-type-type-alien-type type)) t))
62 (multiple-value-bind (res win)
63 (ctypep obj (negation-type-type type))
68 ;; Now the tricky stuff.
69 (let* ((hairy-spec (hairy-type-specifier type))
70 (symbol (if (consp hairy-spec) (car hairy-spec) hairy-spec)))
75 (dolist (spec (cdr hairy-spec) (values t t))
76 (multiple-value-bind (res win)
77 (ctypep obj (specifier-type spec))
78 (unless win (return (values nil nil)))
79 (unless res (return (values nil t)))))))
81 (multiple-value-bind (res win)
82 (ctypep obj (specifier-type (cadr hairy-spec)))
87 (let ((predicate-name (second hairy-spec)))
88 (declare (type symbol predicate-name)) ; by ANSI spec of SATISFIES
89 (if (fboundp predicate-name)
90 (let* (;; "Is OBJ of the SATISFIES type?" represented
91 ;; as a generalized boolean.
93 ;; (Why IGNORE-ERRORS? This code is used to try to
94 ;; check type relationships at compile time.
95 ;; Passing only-slightly-twisted types like
96 ;; (AND INTEGER (SATISFIES ODDP)) into the
97 ;; rather-significantly-twisted type dispatch
98 ;; system can easily give rise to oddities like
99 ;; calling predicates like ODDP on values they
100 ;; don't like. (E.g. on OBJ=#\NEWLINE when the
101 ;; above type is tested for TYPE= against
102 ;; STANDARD-CHAR, represented as a
103 ;; MEMBER-TYPE.) In such cases, NIL seems to be
104 ;; an appropriate answer to "is OBJ of the
106 (gbool (ignore-errors (funcall predicate-name obj)))
107 ;; RAW coerced to a pure BOOLEAN value
108 (bool (not (not gbool))))
110 (values nil nil)))))))))
112 ;;; Return the layout for an object. This is the basic operation for
113 ;;; finding out the "type" of an object, and is used for generic
114 ;;; function dispatch. The standard doesn't seem to say as much as it
115 ;;; should about what this returns for built-in objects. For example,
116 ;;; it seems that we must return NULL rather than LIST when X is NIL
117 ;;; so that GF's can specialize on NULL.
118 #!-sb-fluid (declaim (inline layout-of))
120 (declare (optimize (speed 3) (safety 0)))
121 (cond ((typep x 'instance) (%instance-layout x))
122 ((funcallable-instance-p x) (%funcallable-instance-layout x))
124 ;; Note: was #.((CLASS-LAYOUT (SB!XC:FIND-CLASS 'NULL))).
125 ;; I (WHN 19990209) replaced this with an expression evaluated at
126 ;; run time in order to make it easier to build the cross-compiler.
127 ;; If it doesn't work, something else will be needed..
129 ;; KLUDGE: In order to really make this run at run time
130 ;; (instead of doing some weird broken thing at cold load
131 ;; time), we need to suppress a DEFTRANSFORM.. -- WHN 19991004
132 (declare (notinline sb!xc:find-class))
133 (class-layout (sb!xc:find-class 'null))))
134 (t (svref *built-in-class-codes* (widetag-of x)))))
136 #!-sb-fluid (declaim (inline sb!xc:class-of))
137 (defun sb!xc:class-of (object)
139 "Return the class of the supplied object, which may be any Lisp object, not
140 just a CLOS STANDARD-OBJECT."
141 (layout-class (layout-of object)))
143 ;;; Pull the type specifier out of a function object.
144 (defun extract-fun-type (fun)
145 (specifier-type (%simple-fun-type (%closure-fun fun))))
147 ;;;; miscellaneous interfaces
149 ;;; Clear memoization of all type system operations that can be
150 ;;; altered by type definition/redefinition.
151 (defun clear-type-caches ()
152 (when *type-system-initialized*
153 (dolist (sym '(values-specifier-type-cache-clear
154 values-type-union-cache-clear
155 type-union2-cache-clear
156 values-subtypep-cache-clear
157 csubtypep-cache-clear
158 type-intersection2-cache-clear
159 values-type-intersection-cache-clear))
160 (funcall (the function (symbol-function sym)))))
163 ;;; This is like TYPE-OF, only we return a CTYPE structure instead of
164 ;;; a type specifier, and we try to return the type most useful for
165 ;;; type checking, rather than trying to come up with the one that the
166 ;;; user might find most informative.
167 (declaim (ftype (function (t) ctype) ctype-of))
168 (defun-cached (ctype-of
169 :hash-function (lambda (x) (logand (sxhash x) #x1FF))
171 :init-wrapper !cold-init-forms)
175 (if (funcallable-instance-p x)
177 (extract-fun-type x)))
179 (make-member-type :members (list x)))
183 (let ((etype (specifier-type (array-element-type x))))
184 (make-array-type :dimensions (array-dimensions x)
185 :complexp (not (typep x 'simple-array))
187 :specialized-element-type etype)))
189 (make-cons-type *universal-type* *universal-type*))
191 (sb!xc:class-of x))))
193 ;;; Clear this cache on GC so that we don't hold onto too much garbage.
194 (pushnew 'ctype-of-cache-clear *before-gc-hooks*)
196 (!defun-from-collected-cold-init-forms !target-type-cold-init)