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 (defun proclaim-as-fun-name (name)
44 ;; scrubbing old data I: possible collision with old definition
46 (ecase (info :function :kind name)
47 (:function) ; happy case
48 ((nil)) ; another happy case
49 (:macro ; maybe-not-so-good case
50 (compiler-style-warning "~S was previously defined as a macro." name)
51 (setf (info :function :where-from name) :assumed)
52 (clear-info :function :macro-function name))))
54 ;; scrubbing old data II: dangling forward references
56 ;; (This could happen if someone does PROCLAIM FTYPE in macroexpansion,
57 ;; which is bad style, or at compile time, e.g. in EVAL-WHEN (:COMPILE)
58 ;; inside something like DEFSTRUCT, in which case it's reasonable style.
59 ;; Either way, it's no longer a free function.)
60 (when (boundp '*free-functions*) ; when compiling
61 (remhash name *free-functions*))
63 ;; recording the ordinary case
64 (setf (info :function :kind name) :function)
65 (note-if-setf-function-and-macro name)
69 ;;; This is called to do something about SETF functions that overlap
70 ;;; with SETF macros. Perhaps we should interact with the user to see
71 ;;; whether the macro should be blown away, but for now just give a
72 ;;; warning. Due to the weak semantics of the (SETF FUNCTION) name, we
73 ;;; can't assume that they aren't just naming a function (SETF FOO)
74 ;;; for the heck of it. NAME is already known to be well-formed.
75 (defun note-if-setf-function-and-macro (name)
77 (when (or (info :setf :inverse name)
78 (info :setf :expander name))
79 (compiler-style-warning
80 "defining as a SETF function a name that already has a SETF macro:~
85 ;;; Make NAME no longer be a function name: clear everything back to
87 (defun undefine-fun-name (name)
89 (macrolet ((frob (type &optional val)
90 `(unless (eq (info :function ,type name) ,val)
91 (setf (info :function ,type name) ,val))))
93 (frob :type (specifier-type 'function))
94 (frob :where-from :assumed)
97 (frob :inline-expansion-designator)
98 (frob :source-transform)
99 (frob :assumed-type)))
102 ;;; part of what happens with DEFUN, also with some PCL stuff: Make
103 ;;; NAME known to be a function definition.
104 (defun become-defined-fun-name (name)
105 (proclaim-as-fun-name name)
106 (when (eq (info :function :where-from name) :assumed)
107 (setf (info :function :where-from name) :defined)
108 (if (info :function :assumed-type name)
109 (setf (info :function :assumed-type name) nil))))
111 ;;;; ANSI Common Lisp functions which are defined in terms of the info
114 (defun sb!xc:constantp (object &optional environment)
116 "True of any Lisp object that has a constant value: types that eval to
117 themselves, keywords, constants, and list whose car is QUOTE."
118 ;; FIXME: Should STRUCTURE-OBJECT and/or STANDARD-OBJECT be here?
119 ;; They eval to themselves..
121 ;; FIXME: Someday it would be nice to make the code recognize foldable
122 ;; functions and call itself recursively on their arguments, so that
123 ;; more of the examples in the ANSI CL definition are recognized.
124 ;; (e.g. (+ 3 2), (SQRT PI), and (LENGTH '(A B C)))
125 (declare (ignore environment))
130 ;; (Note that the following test on INFO catches KEYWORDs as well as
131 ;; explicitly DEFCONSTANT symbols.)
132 (symbol (eq (info :variable :kind object) :constant))
133 (list (eq (car object) 'quote))))
135 (declaim (ftype (function (symbol &optional (or null sb!c::lexenv))) sb!xc:macro-function))
136 (defun sb!xc:macro-function (symbol &optional env)
138 "If SYMBOL names a macro in ENV, returns the expansion function,
139 else returns NIL. If ENV is unspecified or NIL, use the global
141 (declare (symbol symbol))
142 (let* ((fenv (when env (sb!c::lexenv-functions env)))
143 (local-def (cdr (assoc symbol fenv))))
145 (if (and (consp local-def) (eq (car local-def) 'MACRO))
148 ((eq (info :function :kind symbol) :macro)
149 (values (info :function :macro-function symbol)))
153 ;;; Note: Technically there could be an ENV optional argument to SETF
154 ;;; MACRO-FUNCTION, but since ANSI says that the consequences of
155 ;;; supplying that optional argument are undefined, we don't allow it.
156 ;;; (Thus our implementation of this unspecified behavior is to
157 ;;; complain that the wrong number of arguments was supplied. Since
158 ;;; the behavior is unspecified, this is conforming.:-)
159 (defun (setf sb!xc:macro-function) (function symbol)
160 (declare (symbol symbol) (type function function))
161 (when (eq (info :function :kind symbol) :special-form)
162 (error "~S names a special form." symbol))
163 (setf (info :function :kind symbol) :macro)
164 (setf (info :function :macro-function symbol) function)
165 ;; This is a nice thing to have in the target SBCL, but in the
166 ;; cross-compilation host it's not nice to mess with
167 ;; (SYMBOL-FUNCTION FOO) where FOO might be a symbol in the
168 ;; cross-compilation host's COMMON-LISP package.
170 (setf (symbol-function symbol)
172 (declare (ignore args))
173 ;; (ANSI specification of FUNCALL says that this should be
174 ;; an error of type UNDEFINED-FUNCTION, not just SIMPLE-ERROR.)
175 (error 'undefined-function :name symbol)))
178 (defun sb!xc:compiler-macro-function (name &optional env)
180 "If NAME names a compiler-macro, returns the expansion function,
181 else returns NIL. Note: if the name is shadowed in ENV by a local
182 definition, or declared NOTINLINE, NIL is returned. Can be
184 (let ((found (and env
185 (cdr (assoc name (sb!c::lexenv-functions env)
187 (unless (eq (cond ((sb!c::defined-fun-p found)
188 (sb!c::defined-fun-inlinep found))
191 (info :function :inlinep name)))
193 (values (info :function :compiler-macro-function name)))))
194 (defun (setf sb!xc:compiler-macro-function) (function name)
195 (declare (type (or symbol list) name)
196 (type (or function null) function))
197 (when (eq (info :function :kind name) :special-form)
198 (error "~S names a special form." name))
199 (setf (info :function :compiler-macro-function name) function)
202 ;;;; a subset of DOCUMENTATION functionality for bootstrapping
204 ;;; FDOCUMENTATION is like DOCUMENTATION, but with less functionality,
205 ;;; and implemented with DEFUN instead of DEFGENERIC so that it can
206 ;;; run before CLOS is set up. Supported DOC-TYPE values are
213 ;;; FIXME: Other types end up in INFO :RANDOM-DOCUMENTATION :STUFF. I
214 ;;; should add some code to monitor this and make sure that nothing is
215 ;;; unintentionally being sent to never never land this way.
216 ;;; FIXME: Rename FDOCUMENTATION to BDOCUMENTATION, by analogy with
217 ;;; DEF!STRUCT and DEF!MACRO and so forth. And consider simply saving
218 ;;; all the BDOCUMENTATION entries in a *BDOCUMENTATION* hash table
219 ;;; and slamming them into PCL once PCL gets going.
220 (defun fdocumentation (x doc-type)
221 (flet ((try-cmucl-random-doc (x doc-type)
222 (declare (symbol doc-type))
224 (values (info :random-documentation :stuff x))))))
228 (symbol (values (info :variable :documentation x)))))
232 ((legal-fun-name-p x)
233 ;; FIXME: Is it really right to make
234 ;; (DOCUMENTATION '(SETF FOO) 'FUNCTION) equivalent to
235 ;; (DOCUMENTATION 'FOO 'FUNCTION)? That's what CMU CL
236 ;; did, so we do it, but I'm not sure it's what ANSI wants.
237 (values (info :function :documentation
238 (fun-name-block-name x))))))
241 (symbol (when (eq (info :type :kind x) :instance)
242 (values (info :type :documentation x))))))
245 (structure-class (values (info :type :documentation (class-name x))))
246 (t (and (typep x 'symbol) (values (info :type :documentation x))))))
247 (setf (info :setf :documentation x))
250 (function (function-doc x))
251 (package (package-doc-string x))
252 (structure-class (values (info :type :documentation (class-name x))))
253 (symbol (try-cmucl-random-doc x doc-type))))
256 ;; FIXME: This code comes from CMU CL, but
257 ;; TRY-CMUCL-RANDOM-DOC doesn't seem to be defined anywhere
258 ;; in CMU CL. Perhaps it could be defined by analogy with the
259 ;; corresponding SETF FDOCUMENTATION code.
260 (symbol (try-cmucl-random-doc x doc-type)))))))
261 (defun (setf fdocumentation) (string name doc-type)
262 ;; FIXME: I think it should be possible to set documentation for
263 ;; things (e.g. compiler macros) named (SETF FOO). fndb.lisp
264 ;; declares DOC-TYPE to be a SYMBOL, which contradicts that. What
267 (variable (setf (info :variable :documentation name) string))
268 (function (setf (info :function :documentation name) string))
269 (structure (if (eq (info :type :kind name) :instance)
270 (setf (info :type :documentation name) string)
271 (error "~S is not the name of a structure type." name)))
272 (type (setf (info :type :documentation name) string))
273 (setf (setf (info :setf :documentation name) string))
275 (let ((pair (assoc doc-type (info :random-documentation :stuff name))))
277 (setf (cdr pair) string)
278 (push (cons doc-type string)
279 (info :random-documentation :stuff name))))))