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 ;;; (Note that when cross-compiling, SB!XC:TYPEP is interpreted as a
13 ;;; test that the host Lisp object OBJECT translates to a target SBCL
14 ;;; type TYPE. This behavior is needed e.g. to test for the validity
15 ;;; of numeric subtype bounds read when cross-compiling.)
16 (defun typep (object type &optional environment)
18 "Is OBJECT of type TYPE?"
19 (declare (ignore environment))
20 ;; Actually interpreting types at runtime is done by %TYPEP. The
21 ;; cost of the extra function call here should be negligible
22 ;; compared to the cost of interpreting types. (And the compiler
23 ;; tries hard to optimize away the interpretation of types at
24 ;; runtime, and when it succeeds, we never get here anyway.)
27 ;;; the actual TYPEP engine. The compiler only generates calls to this
28 ;;; function when it can't figure out anything more intelligent to do.
29 (defun %typep (object specifier)
31 (if (ctype-p specifier)
33 (specifier-type specifier))))
34 (defun %%typep (object type)
35 (declare (type ctype type))
38 (ecase (named-type-name type)
43 (let (;; I think this works because of an invariant of the
44 ;; two components of a COMPLEX are always coerced to
45 ;; be the same, e.g. (COMPLEX 1.0 3/2) => #C(1.0 1.5).
46 ;; Dunno why that holds, though -- ANSI? Python
47 ;; tradition? marsh faerie spirits? -- WHN 2001-10-27
48 (num (if (complexp object)
51 (ecase (numeric-type-class type)
52 (integer (integerp num))
53 (rational (rationalp num))
55 (ecase (numeric-type-format type)
56 (short-float (typep num 'short-float))
57 (single-float (typep num 'single-float))
58 (double-float (typep num 'double-float))
59 (long-float (typep num 'long-float))
60 ((nil) (floatp num))))
62 (flet ((bound-test (val)
63 (let ((low (numeric-type-low type))
64 (high (numeric-type-high type)))
65 (and (cond ((null low) t)
66 ((listp low) (> val (car low)))
69 ((listp high) (< val (car high)))
70 (t (<= val high)))))))
71 (ecase (numeric-type-complexp type)
74 (and (complexp object)
75 (bound-test (realpart object))
76 (bound-test (imagpart object))))
78 (and (not (complexp object))
79 (bound-test object)))))))
82 (ecase (array-type-complexp type)
83 ((t) (not (typep object 'simple-array)))
84 ((nil) (typep object 'simple-array))
86 (or (eq (array-type-dimensions type) '*)
87 (do ((want (array-type-dimensions type) (cdr want))
88 (got (array-dimensions object) (cdr got)))
89 ((and (null want) (null got)) t)
91 (or (eq (car want) '*)
92 (= (car want) (car got))))
94 (if (unknown-type-p (array-type-element-type type))
95 ;; better to fail this way than to get bogosities like
96 ;; (TYPEP (MAKE-ARRAY 11) '(ARRAY SOME-UNDEFINED-TYPE)) => T
97 (error "~@<unknown element type in array type: ~2I~_~S~:>"
98 (type-specifier type))
100 (or (eq (array-type-element-type type) *wild-type*)
101 (values (type= (array-type-specialized-element-type type)
102 (specifier-type (array-element-type
105 (if (member object (member-type-members type)) t))
107 #+sb-xc-host (ctypep object type)
108 #-sb-xc-host (classoid-typep (layout-of object) type object))
110 (some (lambda (union-type-type) (%%typep object union-type-type))
111 (union-type-types type)))
113 (every (lambda (intersection-type-type)
114 (%%typep object intersection-type-type))
115 (intersection-type-types type)))
118 (%%typep (car object) (cons-type-car-type type))
119 (%%typep (cdr object) (cons-type-cdr-type type))))
121 (and (characterp object)
122 (let ((code (char-code object))
123 (pairs (character-set-type-pairs type)))
124 (dolist (pair pairs nil)
125 (destructuring-bind (low . high) pair
126 (when (<= low code high)
129 ;; dunno how to do this ANSIly -- WHN 19990413
130 #+sb-xc-host (error "stub: %%TYPEP UNKNOWN-TYPE in xcompilation host")
131 ;; Parse it again to make sure it's really undefined.
132 (let ((reparse (specifier-type (unknown-type-specifier type))))
133 (if (typep reparse 'unknown-type)
134 (error "unknown type specifier: ~S"
135 (unknown-type-specifier reparse))
136 (%%typep object reparse))))
138 (not (%%typep object (negation-type-type type))))
140 ;; Now the tricky stuff.
141 (let* ((hairy-spec (hairy-type-specifier type))
142 (symbol (car hairy-spec)))
145 (every (lambda (spec) (%%typep object (specifier-type spec)))
147 ;; Note: it should be safe to skip OR here, because union
148 ;; types can always be represented as UNION-TYPE in general
149 ;; or other CTYPEs in special cases; we never need to use
150 ;; HAIRY-TYPE for them.
152 (unless (proper-list-of-length-p hairy-spec 2)
153 (error "invalid type specifier: ~S" hairy-spec))
154 (not (%%typep object (specifier-type (cadr hairy-spec)))))
156 (unless (proper-list-of-length-p hairy-spec 2)
157 (error "invalid type specifier: ~S" hairy-spec))
158 (values (funcall (symbol-function (cadr hairy-spec)) object))))))
160 (sb!alien-internals:alien-typep object (alien-type-type-alien-type type)))
162 (error "Function types are not a legal argument to TYPEP:~% ~S"
163 (type-specifier type)))))
165 ;;; Do a type test from a class cell, allowing forward reference and
167 (defun classoid-cell-typep (obj-layout cell object)
168 (let ((classoid (classoid-cell-classoid cell)))
170 (error "The class ~S has not yet been defined."
171 (classoid-cell-name cell)))
172 (classoid-typep obj-layout classoid object)))
174 ;;; Test whether OBJ-LAYOUT is from an instance of CLASSOID.
175 (defun classoid-typep (obj-layout classoid object)
176 (declare (optimize speed))
177 (when (layout-invalid obj-layout)
178 (if (and (typep (classoid-of object) 'standard-classoid) object)
179 (setq obj-layout (sb!pcl::check-wrapper-validity object))
180 (error "TYPEP was called on an obsolete object (was class ~S)."
181 (classoid-proper-name (layout-classoid obj-layout)))))
182 (let ((layout (classoid-layout classoid))
183 (obj-inherits (layout-inherits obj-layout)))
184 (when (layout-invalid layout)
185 (error "The class ~S is currently invalid." classoid))
186 (or (eq obj-layout layout)
187 (dotimes (i (length obj-inherits) nil)
188 (when (eq (svref obj-inherits i) layout)
191 ;;; This implementation is a placeholder to use until PCL is set up,
192 ;;; at which time it will be overwritten by a real implementation.
193 (defun sb!pcl::check-wrapper-validity (object)