;;;; files for more information.
(in-package "SB!IMPL")
+\f
+;;;; function names and documentation
+
+;;;; the ANSI interface to function names (and to other stuff too)
+(defun function-lambda-expression (fun)
+ "Return (VALUES DEFINING-LAMBDA-EXPRESSION CLOSURE-P NAME), where
+ DEFINING-LAMBDA-EXPRESSION is NIL if unknown, or a suitable argument
+ to COMPILE otherwise, CLOSURE-P is non-NIL if the function's definition
+ might have been enclosed in some non-null lexical environment, and
+ NAME is some name (for debugging only) or NIL if there is no name."
+ (declare (type function fun))
+ (let* ((fun (%simple-fun-self fun))
+ (name (%fun-name fun))
+ (code (sb!di::fun-code-header fun))
+ (info (sb!kernel:%code-debug-info code)))
+ (if info
+ (let ((source (first (sb!c::compiled-debug-info-source info))))
+ (cond ((and (eq (sb!c::debug-source-from source) :lisp)
+ (eq (sb!c::debug-source-info source) fun))
+ (values (second (svref (sb!c::debug-source-name source) 0))
+ nil
+ name))
+ ((stringp name)
+ (values nil t name))
+ (t
+ (let ((exp (fun-name-inline-expansion name)))
+ (if exp
+ (values exp nil name)
+ (values nil t name))))))
+ (values nil t name))))
+
+;;; a SETFable function to return the associated debug name for FUN
+;;; (i.e., the third value returned from CL:FUNCTION-LAMBDA-EXPRESSION),
+;;; or NIL if there's none
+(defun %fun-name (fun)
+ (case (widetag-of fun)
+ (#.sb!vm:closure-header-widetag
+ (%simple-fun-name (%closure-fun fun)))
+ ((#.sb!vm:simple-fun-header-widetag
+ #.sb!vm:closure-fun-header-widetag)
+ ;; KLUDGE: The pun that %SIMPLE-FUN-NAME is used for closure
+ ;; functions is left over from CMU CL (modulo various renaming
+ ;; that's gone on since the fork).
+ (%simple-fun-name fun))
+ (#.sb!vm:funcallable-instance-header-widetag
+ (%simple-fun-name
+ (funcallable-instance-fun fun)))))
+
+(defun (setf %fun-name) (new-name fun)
+ (let ((widetag (widetag-of fun)))
+ (case widetag
+ ((#.sb!vm:simple-fun-header-widetag
+ #.sb!vm:closure-fun-header-widetag)
+ ;; KLUDGE: The pun that %SIMPLE-FUN-NAME is used for closure
+ ;; functions is left over from CMU CL (modulo various renaming
+ ;; that's gone on since the fork).
+ (setf (%simple-fun-name fun) new-name))
+ (#.sb!vm:closure-header-widetag
+ ;; FIXME: It'd be nice to be able to set %FUN-NAME here on
+ ;; per-closure basis. Instead, we are still using the CMU CL
+ ;; approach of closures being named after their closure
+ ;; function, which doesn't work right e.g. for structure
+ ;; accessors, and might not be quite right for DEFUN
+ ;; in a non-null lexical environment either.
+ ;; When/if weak hash tables become supported
+ ;; again, it'll become easy to fix this, but for now there
+ ;; seems to be no easy way (short of the ugly way of adding a
+ ;; slot to every single closure header), so we don't.
+ ;;
+ ;; Meanwhile, users might encounter this problem by doing DEFUN
+ ;; in a non-null lexical environment, so we try to give a
+ ;; reasonably meaningful user-level "error" message (but only
+ ;; as a warning because this is optional debugging
+ ;; functionality anyway, not some hard ANSI requirement).
+ (warn "can't set name for closure, leaving name unchanged"))
+ (t
+ ;; The other function subtype names are also un-settable
+ ;; but this problem seems less likely to be tickled by
+ ;; user-level code, so we can give a implementor-level
+ ;; "error" (warning) message.
+ (warn "can't set function name ((~S function)=~S), leaving it unchanged"
+ 'widetag-of widetag))))
+ new-name)
-;;; cobbled from stuff in describe.lisp.
-(defun function-doc (x)
- (let ((name
- (case (widetag-of x)
- (#.sb!vm:closure-header-widetag
- (%simple-fun-name (%closure-fun x)))
- ((#.sb!vm:simple-fun-header-widetag
- #.sb!vm:closure-fun-header-widetag)
- (%simple-fun-name x))
- (#.sb!vm:funcallable-instance-header-widetag
- (%simple-fun-name
- (funcallable-instance-fun x))))))
+(defun %fun-doc (x)
+ ;; FIXME: This business of going through %FUN-NAME and then globaldb
+ ;; is the way CMU CL did it, but it doesn't really seem right.
+ ;; When/if weak hash tables become supported again, using a weak
+ ;; hash table to maintain the object/documentation association would
+ ;; probably be better.
+ (let ((name (%fun-name x)))
(when (and name (typep name '(or symbol cons)))
(values (info :function :documentation name)))))
+\f
+;;; various environment inquiries
(defvar *features* '#.sb-cold:*shebang-features*
#!+sb-doc
"a list of symbols that describe features provided by the
implementation")
-\f
-;;; various environment inquiries
(defun machine-instance ()
#!+sb-doc
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