1 ;;;; miscellaneous functions which use INFO
3 ;;;; (In CMU CL, these were in globaldb.lisp. They've been moved here
4 ;;;; because references to INFO can't be compiled correctly until
5 ;;;; globaldb initialization is complete, and the SBCL technique for
6 ;;;; initializing the global database in the cross-compiler isn't
7 ;;;; completed until load time.)
9 ;;;; This software is part of the SBCL system. See the README file for
10 ;;;; more information.
12 ;;;; This software is derived from the CMU CL system, which was
13 ;;;; written at Carnegie Mellon University and released into the
14 ;;;; public domain. The software is in the public domain and is
15 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
16 ;;;; files for more information.
20 ;;; Check that NAME is a valid function name, returning the name if
21 ;;; OK, and signalling an error if not. In addition to checking for
22 ;;; basic well-formedness, we also check that symbol names are not NIL
23 ;;; or the name of a special form.
24 (defun check-fun-name (name)
27 (unless (and (consp name) (consp (cdr name))
28 (null (cddr name)) (eq (car name) 'setf)
29 (symbolp (cadr name)))
30 (compiler-error "illegal function name: ~S" name)))
32 (when (eq (info :function :kind name) :special-form)
33 (compiler-error "Special form is an illegal function name: ~S" name)))
35 (compiler-error "illegal function name: ~S" name)))
38 ;;; Record a new function definition, and check its legality.
39 (declaim (ftype (function ((or symbol cons)) t) proclaim-as-fun-name))
40 (defun proclaim-as-fun-name (name)
43 (ecase (info :function :kind name)
45 (let ((accessor-for (info :function :accessor-for name)))
47 (compiler-style-warning
50 ~I~_was previously defined as a slot accessor for ~
54 (clear-info :function :accessor-for name))))
56 (compiler-style-warning "~S was previously defined as a macro." name)
57 (setf (info :function :where-from name) :assumed)
58 (clear-info :function :macro-function name))
60 (setf (info :function :kind name) :function)
61 (note-if-setf-function-and-macro name)
64 ;;; This is called to do something about SETF functions that overlap
65 ;;; with SETF macros. Perhaps we should interact with the user to see
66 ;;; whether the macro should be blown away, but for now just give a
67 ;;; warning. Due to the weak semantics of the (SETF FUNCTION) name, we
68 ;;; can't assume that they aren't just naming a function (SETF FOO)
69 ;;; for the heck of it. NAME is already known to be well-formed.
70 (defun note-if-setf-function-and-macro (name)
72 (when (or (info :setf :inverse name)
73 (info :setf :expander name))
74 (compiler-style-warning
75 "defining as a SETF function a name that already has a SETF macro:~
80 ;;; Make NAME no longer be a function name: clear everything back to
82 (defun undefine-fun-name (name)
84 (macrolet ((frob (type &optional val)
85 `(unless (eq (info :function ,type name) ,val)
86 (setf (info :function ,type name) ,val))))
88 (frob :type (specifier-type 'function))
89 (frob :where-from :assumed)
93 (frob :inline-expansion-designator)
94 (frob :source-transform)
95 (frob :assumed-type)))
98 ;;; part of what happens with DEFUN, also with some PCL stuff: Make
99 ;;; NAME known to be a function definition.
100 (defun become-defined-fun-name (name)
101 (proclaim-as-fun-name name)
102 (when (eq (info :function :where-from name) :assumed)
103 (setf (info :function :where-from name) :defined)
104 (if (info :function :assumed-type name)
105 (setf (info :function :assumed-type name) nil))))
107 ;;;; ANSI Common Lisp functions which are defined in terms of the info
110 (defun sb!xc:constantp (object &optional environment)
112 "True of any Lisp object that has a constant value: types that eval to
113 themselves, keywords, constants, and list whose car is QUOTE."
114 ;; FIXME: Should STRUCTURE-OBJECT and/or STANDARD-OBJECT be here?
115 ;; They eval to themselves..
117 ;; FIXME: Someday it would be nice to make the code recognize foldable
118 ;; functions and call itself recursively on their arguments, so that
119 ;; more of the examples in the ANSI CL definition are recognized.
120 ;; (e.g. (+ 3 2), (SQRT PI), and (LENGTH '(A B C)))
121 (declare (ignore environment))
126 ;; (Note that the following test on INFO catches KEYWORDs as well as
127 ;; explicitly DEFCONSTANT symbols.)
128 (symbol (eq (info :variable :kind object) :constant))
129 (list (eq (car object) 'quote))))
131 (declaim (ftype (function (symbol &optional (or null sb!c::lexenv))) sb!xc:macro-function))
132 (defun sb!xc:macro-function (symbol &optional env)
134 "If SYMBOL names a macro in ENV, returns the expansion function,
135 else returns NIL. If ENV is unspecified or NIL, use the global
137 (declare (symbol symbol))
138 (let* ((fenv (when env (sb!c::lexenv-functions env)))
139 (local-def (cdr (assoc symbol fenv))))
141 (if (and (consp local-def) (eq (car local-def) 'MACRO))
144 ((eq (info :function :kind symbol) :macro)
145 (values (info :function :macro-function symbol)))
149 ;;; Note: Technically there could be an ENV optional argument to SETF
150 ;;; MACRO-FUNCTION, but since ANSI says that the consequences of
151 ;;; supplying that optional argument are undefined, we don't allow it.
152 ;;; (Thus our implementation of this unspecified behavior is to
153 ;;; complain that the wrong number of arguments was supplied. Since
154 ;;; the behavior is unspecified, this is conforming.:-)
155 (defun (setf sb!xc:macro-function) (function symbol)
156 (declare (symbol symbol) (type function function))
157 (when (eq (info :function :kind symbol) :special-form)
158 (error "~S names a special form." symbol))
159 (setf (info :function :kind symbol) :macro)
160 (setf (info :function :macro-function symbol) function)
161 ;; This is a nice thing to have in the target SBCL, but in the
162 ;; cross-compilation host it's not nice to mess with
163 ;; (SYMBOL-FUNCTION FOO) where FOO might be a symbol in the
164 ;; cross-compilation host's COMMON-LISP package.
166 (setf (symbol-function symbol)
168 (declare (ignore args))
169 ;; (ANSI specification of FUNCALL says that this should be
170 ;; an error of type UNDEFINED-FUNCTION, not just SIMPLE-ERROR.)
171 (error 'undefined-function :name symbol)))
174 (defun sb!xc:compiler-macro-function (name &optional env)
176 "If NAME names a compiler-macro, returns the expansion function,
177 else returns NIL. Note: if the name is shadowed in ENV by a local
178 definition, or declared NOTINLINE, NIL is returned. Can be
180 (let ((found (and env
181 (cdr (assoc name (sb!c::lexenv-functions env)
183 (unless (eq (cond ((sb!c::defined-function-p found)
184 (sb!c::defined-function-inlinep found))
187 (info :function :inlinep name)))
189 (values (info :function :compiler-macro-function name)))))
190 (defun (setf sb!xc:compiler-macro-function) (function name)
191 (declare (type (or symbol list) name)
192 (type (or function null) function))
193 (when (eq (info :function :kind name) :special-form)
194 (error "~S names a special form." name))
195 (setf (info :function :compiler-macro-function name) function)
198 ;;;; a subset of DOCUMENTATION functionality for bootstrapping
200 ;;; FDOCUMENTATION is like DOCUMENTATION, but with less functionality,
201 ;;; and implemented with DEFUN instead of DEFGENERIC so that it can
202 ;;; run before CLOS is set up. Supported DOC-TYPE values are
209 ;;; FIXME: Other types end up in INFO :RANDOM-DOCUMENTATION :STUFF. I
210 ;;; should add some code to monitor this and make sure that nothing is
211 ;;; unintentionally being sent to never never land this way.
212 ;;; FIXME: Rename FDOCUMENTATION to BDOCUMENTATION, by analogy with
213 ;;; DEF!STRUCT and DEF!MACRO and so forth. And consider simply saving
214 ;;; all the BDOCUMENTATION entries in a *BDOCUMENTATION* hash table
215 ;;; and slamming them into PCL once PCL gets going.
216 (defun fdocumentation (x doc-type)
217 (flet ((try-cmucl-random-doc (x doc-type)
218 (declare (symbol doc-type))
220 (values (info :random-documentation :stuff x))))))
224 (symbol (values (info :variable :documentation x)))))
228 ((legal-fun-name-p x)
229 ;; FIXME: Is it really right to make
230 ;; (DOCUMENTATION '(SETF FOO) 'FUNCTION) equivalent to
231 ;; (DOCUMENTATION 'FOO 'FUNCTION)? That's what CMU CL
232 ;; did, so we do it, but I'm not sure it's what ANSI wants.
233 (values (info :function :documentation
234 (fun-name-block-name x))))))
237 (symbol (when (eq (info :type :kind x) :instance)
238 (values (info :type :documentation x))))))
241 (structure-class (values (info :type :documentation (class-name x))))
242 (t (and (typep x 'symbol) (values (info :type :documentation x))))))
243 (setf (info :setf :documentation x))
246 (function (function-doc x))
247 (package (package-doc-string x))
248 (structure-class (values (info :type :documentation (class-name x))))
249 (symbol (try-cmucl-random-doc x doc-type))))
252 ;; FIXME: This code comes from CMU CL, but
253 ;; TRY-CMUCL-RANDOM-DOC doesn't seem to be defined anywhere
254 ;; in CMU CL. Perhaps it could be defined by analogy with the
255 ;; corresponding SETF FDOCUMENTATION code.
256 (symbol (try-cmucl-random-doc x doc-type)))))))
257 (defun (setf fdocumentation) (string name doc-type)
258 ;; FIXME: I think it should be possible to set documentation for
259 ;; things (e.g. compiler macros) named (SETF FOO). fndb.lisp
260 ;; declares DOC-TYPE to be a SYMBOL, which contradicts that. What
263 (variable (setf (info :variable :documentation name) string))
264 (function (setf (info :function :documentation name) string))
265 (structure (if (eq (info :type :kind name) :instance)
266 (setf (info :type :documentation name) string)
267 (error "~S is not the name of a structure type." name)))
268 (type (setf (info :type :documentation name) string))
269 (setf (setf (info :setf :documentation name) string))
271 (let ((pair (assoc doc-type (info :random-documentation :stuff name))))
273 (setf (cdr pair) string)
274 (push (cons doc-type string)
275 (info :random-documentation :stuff name))))))