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)
18 ;;; Note that when cross-compiling, SB!XC:TYPEP is interpreted as
19 ;;; a test that the host Lisp object OBJECT translates to a target SBCL
20 ;;; type TYPE. (This behavior is needed e.g. to test for the validity of
21 ;;; numeric subtype bounds read when cross-compiling.)
22 (defun typep (object type)
24 "Return T iff OBJECT is of type TYPE."
27 ;;; If TYPE is a type that we can do a compile-time test on, then
28 ;;; return whether the object is of that type as the first value and
29 ;;; second value true. Otherwise return NIL, NIL.
31 ;;; We give up on unknown types and pick off FUNCTION- and COMPOUND-
32 ;;; types. For STRUCTURE- types, we require that the type be defined
33 ;;; in both the current and compiler environments, and that the
34 ;;; INCLUDES be the same.
36 ;;; KLUDGE: This should probably be a type method instead of a big
37 ;;; ETYPECASE. But then the type method system should probably be CLOS
38 ;;; too, and until that happens wedging more stuff into it might be
39 ;;; messy. So I've left it a big ETYPECASE. -- 2001-03-16
40 (defun ctypep (obj type)
41 (declare (type ctype type))
49 (values (%typep obj type) t))
51 (if (if (csubtypep type (specifier-type 'funcallable-instance))
52 (funcallable-instance-p obj)
53 (typep obj 'instance))
54 (if (eq (class-layout type)
55 (info :type :compiler-layout (sb!xc:class-name type)))
56 (values (sb!xc:typep obj type) t)
60 ;; REMOVEME: old version
65 (dolist (mem (union-type-types type) (values nil certain?))
66 (multiple-value-bind (val win) (ctypep obj mem)
68 (when val (return (values t t)))
69 (setf certain? nil)))))
71 (dolist (mem (intersection-type-types type)
72 (if certain? (values t t) (values nil nil)))
73 (multiple-value-bind (val win) (ctypep obj mem)
75 (unless val (return (values nil t)))
76 (setf certain? nil)))))))
78 (let ((types (compound-type-types type)))
80 (intersection-type (every/type #'ctypep obj types))
81 (union-type (any/type #'ctypep obj types)))))
83 (values (functionp obj) t))
87 (values (alien-typep obj (alien-type-type-alien-type type)) t))
89 ;; Now the tricky stuff.
90 (let* ((hairy-spec (hairy-type-specifier type))
91 (symbol (if (consp hairy-spec) (car hairy-spec) hairy-spec)))
96 (dolist (spec (cdr hairy-spec) (values t t))
97 (multiple-value-bind (res win)
98 (ctypep obj (specifier-type spec))
99 (unless win (return (values nil nil)))
100 (unless res (return (values nil t)))))))
102 (multiple-value-bind (res win)
103 (ctypep obj (specifier-type (cadr hairy-spec)))
108 ;; KLUDGE: This stuff might well blow up if we tried to execute it
109 ;; when cross-compiling. But since for the foreseeable future the
110 ;; only code we'll try to cross-compile is SBCL itself, and SBCL is
111 ;; built without using SATISFIES types, it's arguably not important
112 ;; to worry about this. -- WHN 19990210.
113 (let ((fun (second hairy-spec)))
114 (cond ((and (consp fun)
115 (eq (car fun) 'lambda))
116 (values (not (null (funcall (coerce fun 'function) obj)))
118 ((and (symbolp fun) (fboundp fun))
119 (values (not (null (funcall fun obj))) t))
121 (values nil nil))))))))))
123 ;;; LAYOUT-OF -- Exported
125 ;;; Return the layout for an object. This is the basic operation for
126 ;;; finding out the "type" of an object, and is used for generic function
127 ;;; dispatch. The standard doesn't seem to say as much as it should about what
128 ;;; this returns for built-in objects. For example, it seems that we must
129 ;;; return NULL rather than LIST when X is NIL so that GF's can specialize on
131 #!-sb-fluid (declaim (inline layout-of))
133 (declare (optimize (speed 3) (safety 0)))
134 (cond ((typep x 'instance) (%instance-layout x))
135 ((funcallable-instance-p x) (%funcallable-instance-layout x))
137 ;; Note: was #.((CLASS-LAYOUT (SB!XC:FIND-CLASS 'NULL))).
138 ;; I (WHN 19990209) replaced this with an expression evaluated at
139 ;; run time in order to make it easier to build the cross-compiler.
140 ;; If it doesn't work, something else will be needed..
142 ;; KLUDGE: In order to really make it run at run time (instead of
143 ;; doing some weird broken thing at cold load time),
144 ;; we need to suppress a DEFTRANSFORM.. -- WHN 19991004
145 (declare (notinline sb!xc:find-class))
146 (class-layout (sb!xc:find-class 'null))))
147 (t (svref *built-in-class-codes* (get-type x)))))
149 #!-sb-fluid (declaim (inline sb!xc:class-of))
150 (defun sb!xc:class-of (object)
152 "Return the class of the supplied object, which may be any Lisp object, not
153 just a CLOS STANDARD-OBJECT."
154 (layout-class (layout-of object)))
156 ;;; Pull the type specifier out of a function object.
157 (defun extract-function-type (fun)
158 (if (sb!eval:interpreted-function-p fun)
159 (sb!eval:interpreted-function-type fun)
161 (byte-function (byte-function-type fun))
162 (byte-closure (byte-function-type (byte-closure-function fun)))
164 (specifier-type (%function-type (%closure-function fun)))))))
166 ;;;; miscellaneous interfaces
168 ;;; Clear memoization of all type system operations that can be
169 ;;; altered by type definition/redefinition.
170 (defun clear-type-caches ()
171 (when *type-system-initialized*
172 (dolist (sym '(values-specifier-type-cache-clear
173 values-type-union-cache-clear
174 type-union-cache-clear
175 values-subtypep-cache-clear
176 csubtypep-cache-clear
177 type-intersection2-cache-clear
178 values-type-intersection-cache-clear))
179 (funcall (symbol-function sym))))
182 ;;; Like TYPE-OF, only we return a CTYPE structure instead of a type
183 ;;; specifier, and we try to return the type most useful for type
184 ;;; checking, rather than trying to come up with the one that the user
185 ;;; might find most informative.
186 (declaim (ftype (function (t) ctype) ctype-of))
187 (defun-cached (ctype-of
188 :hash-function (lambda (x) (logand (sxhash x) #x1FF))
190 :init-wrapper !cold-init-forms)
194 (if (funcallable-instance-p x)
196 (extract-function-type x)))
198 (make-member-type :members (list x)))
200 (let* ((num (if (complexp x) (realpart x) x))
201 (res (make-numeric-type
202 :class (etypecase num
206 :format (if (floatp num)
207 (float-format-name num)
210 (setf (numeric-type-complexp res) :complex)
211 (let ((imag (imagpart x)))
212 (setf (numeric-type-low res) (min num imag))
213 (setf (numeric-type-high res) (max num imag))))
215 (setf (numeric-type-low res) num)
216 (setf (numeric-type-high res) num)))
219 (let ((etype (specifier-type (array-element-type x))))
220 (make-array-type :dimensions (array-dimensions x)
221 :complexp (not (typep x 'simple-array))
223 :specialized-element-type etype)))
225 (make-cons-type *universal-type* *universal-type*))
227 (sb!xc:class-of x))))
229 ;;; Clear this cache on GC so that we don't hold onto too much garbage.
230 (pushnew 'ctype-of-cache-clear *before-gc-hooks*)
232 (!defun-from-collected-cold-init-forms !target-type-cold-init)