src/code/target-misc.lisp

   1 ;;;; Environment query functions, DOCUMENTATION and DRIBBLE.
   2 ;;;;
   3 ;;;; FIXME: If there are exactly three things in here, it could be
   4 ;;;; exactly three files named e.g. equery.lisp, doc.lisp, and dribble.lisp.
   5
   6 ;;;; This software is part of the SBCL system. See the README file for
   7 ;;;; more information.
   8 ;;;;
   9 ;;;; This software is derived from the CMU CL system, which was
  10 ;;;; written at Carnegie Mellon University and released into the
  11 ;;;; public domain. The software is in the public domain and is
  12 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  13 ;;;; files for more information.
  14
  15 (in-package "SB!IMPL")
  16 \f
  17 ;;;; function names and documentation
  18
  19 ;;;; the ANSI interface to function names (and to other stuff too)
  20 (defun function-lambda-expression (fun)
  21   "Return (VALUES DEFINING-LAMBDA-EXPRESSION CLOSURE-P NAME), where
  22   DEFINING-LAMBDA-EXPRESSION is NIL if unknown, or a suitable argument
  23   to COMPILE otherwise, CLOSURE-P is non-NIL if the function's definition
  24   might have been enclosed in some non-null lexical environment, and
  25   NAME is some name (for debugging only) or NIL if there is no name."
  26   (declare (type function fun))
  27   (etypecase fun
  28     #!+sb-eval
  29     (sb!eval:interpreted-function
  30      (let ((name (sb!eval:interpreted-function-name fun))
  31            (lambda-list (sb!eval:interpreted-function-lambda-list fun))
  32            (body (sb!eval:interpreted-function-body fun)))
  33        (values `(lambda ,lambda-list ,@body)
  34                t name)))
  35     (function
  36      (let* ((fun (%simple-fun-self (%fun-fun fun)))
  37             (name (%fun-name fun))
  38             (code (sb!di::fun-code-header fun))
  39             (info (sb!kernel:%code-debug-info code)))
  40        (if info
  41            (let ((source (sb!c::debug-info-source info)))
  42              (cond ((and (eq (sb!c::debug-source-from source) :lisp)
  43                          (eq (sb!c::debug-source-function source) fun))
  44                     (values (svref (sb!c::debug-source-name source) 0)
  45                             nil
  46                             name))
  47                    ((legal-fun-name-p name)
  48                     (let ((exp (fun-name-inline-expansion name)))
  49                       (values exp (not exp) name)))
  50                    (t
  51                     (values nil t name))))
  52            (values nil t name))))))
  53
  54 (defun closurep (object)
  55   (= sb!vm:closure-header-widetag (widetag-of object)))
  56
  57 (defun %fun-fun (function)
  58   (declare (function function))
  59   (case (widetag-of function)
  60     (#.sb!vm:simple-fun-header-widetag
  61      function)
  62     (#.sb!vm:closure-header-widetag
  63      (%closure-fun function))
  64     (#.sb!vm:funcallable-instance-header-widetag
  65      (%fun-fun (funcallable-instance-fun function)))))
  66
  67 (defun %closure-values (object)
  68   (declare (function object))
  69   (loop for index from 0
  70      below (- (get-closure-length object) (1- sb!vm:closure-info-offset))
  71      collect (%closure-index-ref object index)))
  72
  73 (defun %fun-lambda-list (object)
  74   (%simple-fun-arglist (%fun-fun object)))
  75
  76 ;;; a SETFable function to return the associated debug name for FUN
  77 ;;; (i.e., the third value returned from CL:FUNCTION-LAMBDA-EXPRESSION),
  78 ;;; or NIL if there's none
  79 (defun %fun-name (function)
  80   (%simple-fun-name (%fun-fun function)))
  81
  82 (defun %fun-type (function)
  83   (%simple-fun-type (%fun-fun function)))
  84
  85 (defun (setf %fun-name) (new-name fun)
  86   (aver nil) ; since this is unsafe 'til bug 137 is fixed
  87   (let ((widetag (widetag-of fun)))
  88     (case widetag
  89       (#.sb!vm:simple-fun-header-widetag
  90        ;; KLUDGE: The pun that %SIMPLE-FUN-NAME is used for closure
  91        ;; functions is left over from CMU CL (modulo various renaming
  92        ;; that's gone on since the fork).
  93        (setf (%simple-fun-name fun) new-name))
  94       (#.sb!vm:closure-header-widetag
  95        ;; FIXME: It'd be nice to be able to set %FUN-NAME here on
  96        ;; per-closure basis. Instead, we are still using the CMU CL
  97        ;; approach of closures being named after their closure
  98        ;; function, which doesn't work right e.g. for structure
  99        ;; accessors, and might not be quite right for DEFUN
 100        ;; in a non-null lexical environment either.
 101        ;; When/if weak hash tables become supported
 102        ;; again, it'll become easy to fix this, but for now there
 103        ;; seems to be no easy way (short of the ugly way of adding a
 104        ;; slot to every single closure header), so we don't.
 105        ;;
 106        ;; Meanwhile, users might encounter this problem by doing DEFUN
 107        ;; in a non-null lexical environment, so we try to give a
 108        ;; reasonably meaningful user-level "error" message (but only
 109        ;; as a warning because this is optional debugging
 110        ;; functionality anyway, not some hard ANSI requirement).
 111        (warn "can't set name for closure, leaving name unchanged"))
 112       (t
 113        ;; The other function subtype names are also un-settable
 114        ;; but this problem seems less likely to be tickled by
 115        ;; user-level code, so we can give a implementor-level
 116        ;; "error" (warning) message.
 117        (warn "can't set function name ((~S function)=~S), leaving it unchanged"
 118              'widetag-of widetag))))
 119   new-name)
 120
 121 (defun %fun-doc (x)
 122   ;; FIXME: This business of going through %FUN-NAME and then globaldb
 123   ;; is the way CMU CL did it, but it doesn't really seem right.
 124   ;; When/if weak hash tables become supported again, using a weak
 125   ;; hash table to maintain the object/documentation association would
 126   ;; probably be better.
 127   (let ((name (%fun-name x)))
 128     (when (and name (typep name '(or symbol cons)))
 129       (values (info :function :documentation name)))))
 130 \f
 131 ;;; various environment inquiries
 132
 133 (defvar *features* '#.sb-cold:*shebang-features*
 134   #!+sb-doc
 135   "a list of symbols that describe features provided by the
 136    implementation")
 137
 138 (defun machine-instance ()
 139   #!+sb-doc
 140   "Return a string giving the name of the local machine."
 141   #!+win32 (sb!win32::get-computer-name)
 142   #!-win32 (sb!unix:unix-gethostname))
 143
 144 (defvar *machine-version*)
 145
 146 (defun machine-version ()
 147   #!+sb-doc
 148   "Return a string describing the version of the computer hardware we
 149 are running on, or NIL if we can't find any useful information."
 150   (unless (boundp '*machine-version*)
 151     (setf *machine-version* (get-machine-version)))
 152   *machine-version*)
 153
 154 ;;; FIXME: Don't forget to set these in a sample site-init file.
 155 ;;; FIXME: Perhaps the functions could be SETFable instead of having the
 156 ;;; interface be through special variables? As far as I can tell
 157 ;;; from ANSI 11.1.2.1.1 "Constraints on the COMMON-LISP Package
 158 ;;; for Conforming Implementations" it is kosher to add a SETF function for
 159 ;;; a symbol in COMMON-LISP..
 160 (defvar *short-site-name* nil
 161   #!+sb-doc
 162   "The value of SHORT-SITE-NAME.")
 163 (defvar *long-site-name* nil
 164   #!+sb-doc "the value of LONG-SITE-NAME")
 165 (defun short-site-name ()
 166   #!+sb-doc
 167   "Return a string with the abbreviated site name, or NIL if not known."
 168   *short-site-name*)
 169 (defun long-site-name ()
 170   #!+sb-doc
 171   "Return a string with the long form of the site name, or NIL if not known."
 172   *long-site-name*)
 173 \f
 174 ;;;; ED
 175 (defvar *ed-functions* nil
 176   "See function documentation for ED.")
 177
 178 (defun ed (&optional x)
 179   "Starts the editor (on a file or a function if named).  Functions
 180 from the list *ED-FUNCTIONS* are called in order with X as an argument
 181 until one of them returns non-NIL; these functions are responsible for
 182 signalling a FILE-ERROR to indicate failure to perform an operation on
 183 the file system."
 184   (dolist (fun *ed-functions*
 185            (error 'extension-failure
 186                   :format-control "Don't know how to ~S ~A"
 187                   :format-arguments (list 'ed x)
 188                   :references (list '(:sbcl :variable *ed-functions*))))
 189     (when (funcall fun x)
 190       (return t))))
 191 \f
 192 ;;;; dribble stuff
 193
 194 ;;; Each time we start dribbling to a new stream, we put it in
 195 ;;; *DRIBBLE-STREAM*, and push a list of *DRIBBLE-STREAM*, *STANDARD-INPUT*,
 196 ;;; *STANDARD-OUTPUT* and *ERROR-OUTPUT* in *PREVIOUS-DRIBBLE-STREAMS*.
 197 ;;; *STANDARD-OUTPUT* and *ERROR-OUTPUT* is changed to a broadcast stream that
 198 ;;; broadcasts to *DRIBBLE-STREAM* and to the old values of the variables.
 199 ;;; *STANDARD-INPUT* is changed to an echo stream that echos input from the old
 200 ;;; value of standard input to *DRIBBLE-STREAM*.
 201 ;;;
 202 ;;; When dribble is called with no arguments, *DRIBBLE-STREAM* is closed,
 203 ;;; and the values of *DRIBBLE-STREAM*, *STANDARD-INPUT*, and
 204 ;;; *STANDARD-OUTPUT* are popped from *PREVIOUS-DRIBBLE-STREAMS*.
 205
 206 (defvar *previous-dribble-streams* nil)
 207 (defvar *dribble-stream* nil)
 208
 209 (defun dribble (&optional pathname &key (if-exists :append))
 210   #!+sb-doc
 211   "With a file name as an argument, dribble opens the file and sends a
 212   record of further I/O to that file. Without an argument, it closes
 213   the dribble file, and quits logging."
 214   (cond (pathname
 215          (let* ((new-dribble-stream
 216                  (open pathname
 217                        :direction :output
 218                        :if-exists if-exists
 219                        :if-does-not-exist :create))
 220                 (new-standard-output
 221                  (make-broadcast-stream *standard-output* new-dribble-stream))
 222                 (new-error-output
 223                  (make-broadcast-stream *error-output* new-dribble-stream))
 224                 (new-standard-input
 225                  (make-echo-stream *standard-input* new-dribble-stream)))
 226            (push (list *dribble-stream* *standard-input* *standard-output*
 227                        *error-output*)
 228                  *previous-dribble-streams*)
 229            (setf *dribble-stream* new-dribble-stream)
 230            (setf *standard-input* new-standard-input)
 231            (setf *standard-output* new-standard-output)
 232            (setf *error-output* new-error-output)))
 233         ((null *dribble-stream*)
 234          (error "not currently dribbling"))
 235         (t
 236          (let ((old-streams (pop *previous-dribble-streams*)))
 237            (close *dribble-stream*)
 238            (setf *dribble-stream* (first old-streams))
 239            (setf *standard-input* (second old-streams))
 240            (setf *standard-output* (third old-streams))
 241            (setf *error-output* (fourth old-streams)))))
 242   (values))
 243
 244 (defun %byte-blt (src src-start dst dst-start dst-end)
 245   (%byte-blt src src-start dst dst-start dst-end))
 246
 247 ;;;; some *LOAD-FOO* variables
 248
 249 (defvar *load-print* nil
 250   #!+sb-doc
 251   "the default for the :PRINT argument to LOAD")
 252
 253 (defvar *load-verbose* nil
 254   ;; Note that CMU CL's default for this was T, and ANSI says it's
 255   ;; implementation-dependent. We choose NIL on the theory that it's
 256   ;; a nicer default behavior for Unix programs.
 257   #!+sb-doc
 258   "the default for the :VERBOSE argument to LOAD")