1 ;;;; stuff related to the toplevel read-eval-print loop, plus some
2 ;;;; other miscellaneous functions that we don't have any better place
5 ;;;; This software is part of the SBCL system. See the README file for
8 ;;;; This software is derived from the CMU CL system, which was
9 ;;;; written at Carnegie Mellon University and released into the
10 ;;;; public domain. The software is in the public domain and is
11 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
12 ;;;; files for more information.
14 (in-package "SB!IMPL")
16 ;;;; magic specials initialized by GENESIS
18 ;;; FIXME: The DEFVAR here is redundant with the (DECLAIM (SPECIAL ..))
19 ;;; of all static symbols in early-impl.lisp.
21 (defvar sb!vm::*current-catch-block*)
22 (defvar sb!vm::*current-unwind-protect-block*)
23 #!+hpux (defvar sb!vm::*c-lra*)
24 (defvar *free-interrupt-context-index*))
26 ;;; specials initialized by !COLD-INIT
28 ;;; FIXME: These could be converted to DEFVARs.
29 (declaim (special #!+(or x86 x86-64) *pseudo-atomic-bits*
30 *allow-with-interrupts*
33 *type-system-initialized*))
35 (defvar *cold-init-complete-p*)
37 ;;; counts of nested errors (with internal errors double-counted)
38 (defvar *maximum-error-depth*)
39 (defvar *current-error-depth*)
41 ;;;; default initfiles
43 (defun sysinit-pathname ()
44 (or (let ((sbcl-homedir (sbcl-homedir-pathname)))
46 (probe-file (merge-pathnames "sbclrc" sbcl-homedir))))
48 (merge-pathnames "sbcl\\sbclrc"
49 (sb!win32::get-folder-pathname
50 sb!win32::csidl_common_appdata))
54 (defun userinit-pathname ()
55 (merge-pathnames ".sbclrc" (user-homedir-pathname)))
57 (defvar *sysinit-pathname-function* #'sysinit-pathname
59 "Designator for a function of zero arguments called to obtain a pathname
60 designator for the default sysinit file, or NIL. If the function returns NIL,
61 no sysinit file is used unless one has been specified on the command-line.")
63 (defvar *userinit-pathname-function* #'userinit-pathname
65 "Designator for a function of zero arguments called to obtain a pathname
66 designator or a stream for the default userinit file, or NIL. If the function
67 returns NIL, no userinit file is used unless one has been specified on the
71 ;;;; miscellaneous utilities for working with with TOPLEVEL
73 ;;; Execute BODY in a context where any %END-OF-THE-WORLD (thrown e.g.
74 ;;; by QUIT) is caught and any final processing and return codes are
75 ;;; handled appropriately.
76 (defmacro handling-end-of-the-world (&body body)
77 (with-unique-names (caught)
78 `(let ((,caught (catch '%end-of-the-world
79 (/show0 "inside CATCH '%END-OF-THE-WORLD")
82 (call-hooks "exit" *exit-hooks*)))))
83 (/show0 "back from CATCH '%END-OF-THE-WORLD, flushing output")
84 (flush-standard-output-streams)
85 (sb!thread::terminate-session)
86 (/show0 "calling UNIX-EXIT")
87 (sb!unix:unix-exit ,caught))))
89 ;;;; working with *CURRENT-ERROR-DEPTH* and *MAXIMUM-ERROR-DEPTH*
91 ;;; INFINITE-ERROR-PROTECT is used by ERROR and friends to keep us out
93 (defmacro infinite-error-protect (&rest forms)
94 `(unless (infinite-error-protector)
95 (/show0 "back from INFINITE-ERROR-PROTECTOR")
96 (let ((*current-error-depth* (1+ *current-error-depth*)))
97 (/show0 "in INFINITE-ERROR-PROTECT, incremented error depth")
98 ;; arbitrary truncation
99 #!+sb-show (sb!debug:backtrace 8)
102 ;;; a helper function for INFINITE-ERROR-PROTECT
103 (defun infinite-error-protector ()
104 (/show0 "entering INFINITE-ERROR-PROTECTOR, *CURRENT-ERROR-DEPTH*=..")
105 (/hexstr *current-error-depth*)
106 (cond ((not *cold-init-complete-p*)
107 (%primitive print "Argh! error in cold init, halting")
108 (%primitive sb!c:halt))
109 ((or (not (boundp '*current-error-depth*))
110 (not (realp *current-error-depth*))
111 (not (boundp '*maximum-error-depth*))
112 (not (realp *maximum-error-depth*)))
113 (%primitive print "Argh! corrupted error depth, halting")
114 (%primitive sb!c:halt))
115 ((> *current-error-depth* *maximum-error-depth*)
116 (/show0 "*MAXIMUM-ERROR-DEPTH*=..")
117 (/hexstr *maximum-error-depth*)
118 (/show0 "in INFINITE-ERROR-PROTECTOR, calling ERROR-ERROR")
119 (error-error "Help! "
120 *current-error-depth*
122 "SB-KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.")
125 (/show0 "returning normally from INFINITE-ERROR-PROTECTOR")
128 ;;; FIXME: I had a badly broken version of INFINITE-ERROR-PROTECTOR at
129 ;;; one point (shown below), and SBCL cross-compiled it without
130 ;;; warning about FORMS being undefined. Check whether that problem
131 ;;; (missing warning) is repeatable in the final system and if so, fix
134 (defun infinite-error-protector ()
135 `(cond ((not *cold-init-complete-p*)
136 (%primitive print "Argh! error in cold init, halting")
137 (%primitive sb!c:halt))
138 ((or (not (boundp '*current-error-depth*))
139 (not (realp *current-error-depth*))
140 (not (boundp '*maximum-error-depth*))
141 (not (realp *maximum-error-depth*)))
142 (%primitive print "Argh! corrupted error depth, halting")
143 (%primitive sb!c:halt))
144 ((> *current-error-depth* *maximum-error-depth*)
145 (/show0 "in INFINITE-ERROR-PROTECTOR, calling ERROR-ERROR")
146 (error-error "Help! "
147 *current-error-depth*
149 "SB-KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.")
153 (/show0 "in INFINITE-ERROR-PROTECTOR, returning normally")
157 ;;;; miscellaneous external functions
161 "This function causes execution to be suspended for N seconds. N may
162 be any non-negative, non-complex number."
163 (when (or (not (realp n))
165 (error 'simple-type-error
166 :format-control "invalid argument to SLEEP: ~S"
167 :format-arguments (list n)
169 :expected-type '(real 0)))
171 (multiple-value-bind (sec nsec)
174 (multiple-value-bind (sec frac)
176 (values sec (truncate frac 1e-9))))
177 (sb!unix:nanosleep sec nsec))
179 (sb!win32:millisleep (truncate (* n 1000)))
182 ;;;; SCRUB-CONTROL-STACK
184 (defconstant bytes-per-scrub-unit 2048)
186 ;;; Zero the unused portion of the control stack so that old objects
187 ;;; are not kept alive because of uninitialized stack variables.
189 ;;; "To summarize the problem, since not all allocated stack frame
190 ;;; slots are guaranteed to be written by the time you call an another
191 ;;; function or GC, there may be garbage pointers retained in your
192 ;;; dead stack locations. The stack scrubbing only affects the part
193 ;;; of the stack from the SP to the end of the allocated stack."
194 ;;; - ram, on cmucl-imp, Tue, 25 Sep 2001
196 ;;; So, as an (admittedly lame) workaround, from time to time we call
197 ;;; scrub-control-stack to zero out all the unused portion. This is
198 ;;; supposed to happen when the stack is mostly empty, so that we have
199 ;;; a chance of clearing more of it: callers are currently (2002.07.18)
202 (defun scrub-control-stack ()
203 (declare (optimize (speed 3) (safety 0))
204 (values (unsigned-byte 20))) ; FIXME: DECLARE VALUES?
206 #!-stack-grows-downward-not-upward
207 (let* ((csp (sap-int (sb!c::control-stack-pointer-sap)))
208 (initial-offset (logand csp (1- bytes-per-scrub-unit)))
210 (- (sap-int (sb!di::descriptor-sap sb!vm:*control-stack-end*))
211 sb!c:*backend-page-bytes*)))
213 ((scrub (ptr offset count)
214 (declare (type system-area-pointer ptr)
215 (type (unsigned-byte 16) offset)
216 (type (unsigned-byte 20) count)
217 (values (unsigned-byte 20)))
218 (cond ((>= (sap-int ptr) end-of-stack) 0)
219 ((= offset bytes-per-scrub-unit)
220 (look (sap+ ptr bytes-per-scrub-unit) 0 count))
222 (setf (sap-ref-word ptr offset) 0)
223 (scrub ptr (+ offset sb!vm:n-word-bytes) count))))
224 (look (ptr offset count)
225 (declare (type system-area-pointer ptr)
226 (type (unsigned-byte 16) offset)
227 (type (unsigned-byte 20) count)
228 (values (unsigned-byte 20)))
229 (cond ((>= (sap-int ptr) end-of-stack) 0)
230 ((= offset bytes-per-scrub-unit)
232 ((zerop (sap-ref-word ptr offset))
233 (look ptr (+ offset sb!vm:n-word-bytes) count))
235 (scrub ptr offset (+ count sb!vm:n-word-bytes))))))
236 (declare (type sb!vm::word csp))
237 (scrub (int-sap (- csp initial-offset))
238 (* (floor initial-offset sb!vm:n-word-bytes) sb!vm:n-word-bytes)
241 #!+stack-grows-downward-not-upward
242 (let* ((csp (sap-int (sb!c::control-stack-pointer-sap)))
243 (end-of-stack (+ (sap-int (sb!di::descriptor-sap sb!vm:*control-stack-start*))
244 sb!c:*backend-page-bytes*))
245 (initial-offset (logand csp (1- bytes-per-scrub-unit))))
247 ((scrub (ptr offset count)
248 (declare (type system-area-pointer ptr)
249 (type (unsigned-byte 16) offset)
250 (type (unsigned-byte 20) count)
251 (values (unsigned-byte 20)))
252 (let ((loc (int-sap (- (sap-int ptr) (+ offset sb!vm:n-word-bytes)))))
253 (cond ((< (sap-int loc) end-of-stack) 0)
254 ((= offset bytes-per-scrub-unit)
255 (look (int-sap (- (sap-int ptr) bytes-per-scrub-unit))
257 (t ;; need to fix bug in %SET-STACK-REF
258 (setf (sap-ref-word loc 0) 0)
259 (scrub ptr (+ offset sb!vm:n-word-bytes) count)))))
260 (look (ptr offset count)
261 (declare (type system-area-pointer ptr)
262 (type (unsigned-byte 16) offset)
263 (type (unsigned-byte 20) count)
264 (values (unsigned-byte 20)))
265 (let ((loc (int-sap (- (sap-int ptr) offset))))
266 (cond ((< (sap-int loc) end-of-stack) 0)
267 ((= offset bytes-per-scrub-unit)
269 ((zerop (sb!kernel::get-lisp-obj-address (stack-ref loc 0)))
270 (look ptr (+ offset sb!vm:n-word-bytes) count))
272 (scrub ptr offset (+ count sb!vm:n-word-bytes)))))))
273 (declare (type sb!vm::word csp))
274 (scrub (int-sap (+ csp initial-offset))
275 (* (floor initial-offset sb!vm:n-word-bytes) sb!vm:n-word-bytes)
278 ;;;; the default toplevel function
282 "a list of all the values returned by the most recent top level EVAL")
283 (defvar // nil #!+sb-doc "the previous value of /")
284 (defvar /// nil #!+sb-doc "the previous value of //")
285 (defvar * nil #!+sb-doc "the value of the most recent top level EVAL")
286 (defvar ** nil #!+sb-doc "the previous value of *")
287 (defvar *** nil #!+sb-doc "the previous value of **")
288 (defvar + nil #!+sb-doc "the value of the most recent top level READ")
289 (defvar ++ nil #!+sb-doc "the previous value of +")
290 (defvar +++ nil #!+sb-doc "the previous value of ++")
291 (defvar - nil #!+sb-doc "the form currently being evaluated")
293 (defun interactive-eval (form)
295 "Evaluate FORM, returning whatever it returns and adjusting ***, **, *,
296 +++, ++, +, ///, //, /, and -."
299 (let ((results (multiple-value-list (eval form))))
310 ;; The bogon returned an unbound marker.
311 ;; FIXME: It would be safer to check every one of the values in RESULTS,
312 ;; instead of just the first one.
314 (cerror "Go on with * set to NIL."
315 "EVAL returned an unbound marker."))
318 ;;; Flush anything waiting on one of the ANSI Common Lisp standard
319 ;;; output streams before proceeding.
320 (defun flush-standard-output-streams ()
321 (dolist (name '(*debug-io*
327 ;; FINISH-OUTPUT may block more easily than FORCE-OUTPUT
328 (force-output (symbol-value name)))
331 (defun process-init-file (specified-pathname kind)
332 (multiple-value-bind (context default-function)
335 (values "sysinit" *sysinit-pathname-function*))
337 (values "userinit" *userinit-pathname-function*)))
338 (flet ((process-stream (stream pathname)
339 (with-simple-restart (abort "Skip rest of ~A file ~S."
340 context (native-namestring pathname))
343 (continue "Ignore error and continue processing ~A file ~S."
344 context (native-namestring pathname))
345 (let ((form (read stream nil stream)))
347 (return-from process-init-file nil)
349 (if specified-pathname
350 (with-open-file (stream (parse-native-namestring specified-pathname)
351 :if-does-not-exist nil)
353 (process-stream stream (pathname stream))
354 (cerror "Ignore missing init file"
355 "The specified ~A file ~A was not found."
356 context specified-pathname)))
357 (let ((default (funcall default-function)))
359 (with-open-file (stream (pathname default) :if-does-not-exist nil)
361 (process-stream stream (pathname stream))))))))))
363 (defun process-eval/load-options (options)
364 (/show0 "handling --eval and --load options")
365 (flet ((process-1 (cons)
366 (destructuring-bind (opt . value) cons
369 (with-simple-restart (continue "Ignore runtime option --eval ~S."
371 (multiple-value-bind (expr pos) (read-from-string value)
372 (if (eq value (read-from-string value nil value :start pos))
374 (error "Multiple expressions in --eval option: ~S"
377 (with-simple-restart (continue "Ignore runtime option --load ~S."
379 (load (native-pathname value))))))
380 (flush-standard-output-streams)))
381 (with-simple-restart (abort "Skip rest of --eval and --load options.")
382 (dolist (option options)
383 (process-1 option)))))
385 ;;; Skips past the shebang line on stream, if any.
386 (defun maybe-skip-shebang-line (stream)
387 (let ((p (file-position stream)))
388 (flet ((next () (read-byte stream nil)))
390 (when (and (eq (next) (char-code #\#))
391 (eq (next) (char-code #\!)))
394 until (or (not x) (eq x (char-code #\newline)))))
396 (file-position stream p))))
399 (defun process-script (script)
400 (let ((pathname (native-pathname script))
403 (with-open-file (f pathname :element-type :default)
404 (maybe-skip-shebang-line f)
405 (load f :verbose nil :print nil)
407 (quit :unix-status (if ok 0 1)))))
409 ;; Errors while processing the command line cause the system to QUIT,
410 ;; instead of trying to go into the Lisp debugger, because trying to
411 ;; go into the Lisp debugger would get into various annoying issues of
412 ;; where we should go after the user tries to return from the
414 (defun startup-error (control-string &rest args)
415 (format *error-output*
416 "fatal error before reaching READ-EVAL-PRINT loop: ~% ~?~%"
419 (quit :unix-status 1))
421 ;;; the default system top level function
422 (defun toplevel-init ()
423 (/show0 "entering TOPLEVEL-INIT")
424 (let ( ;; value of --sysinit option
426 ;; t if --no-sysinit option given
428 ;; value of --userinit option
430 ;; t if --no-userinit option given
432 ;; t if --disable-debugger option given
433 (disable-debugger nil)
434 ;; list of (<kind> . <string>) conses representing --eval and --load
435 ;; options. options. --eval options are stored as strings, so that
436 ;; they can be passed to READ only after their predecessors have been
437 ;; EVALed, so that things work when e.g. REQUIRE in one EVAL form
438 ;; creates a package referred to in the next EVAL form. Storing the
439 ;; original string also makes for easier debugging.
440 (reversed-options nil)
441 ;; Has a --noprint option been seen?
443 ;; Has a --script option been seen?
445 ;; everything in *POSIX-ARGV* except for argv[0]=programname
446 (options (rest *posix-argv*)))
448 (declare (type list options))
450 (/show0 "done with outer LET in TOPLEVEL-INIT")
452 ;; FIXME: There are lots of ways for errors to happen around here
453 ;; (e.g. bad command line syntax, or READ-ERROR while trying to
454 ;; READ an --eval string). Make sure that they're handled
457 ;; Process command line options.
458 (loop while options do
459 (/show0 "at head of LOOP WHILE OPTIONS DO in TOPLEVEL-INIT")
460 (let ((option (first options)))
461 (flet ((pop-option ()
465 "unexpected end of command line options"))))
466 (cond ((string= option "--script")
468 (setf disable-debugger t
473 ((string= option "--sysinit")
476 (startup-error "multiple --sysinit options")
477 (setf sysinit (pop-option))))
478 ((string= option "--no-sysinit")
481 ((string= option "--userinit")
484 (startup-error "multiple --userinit options")
485 (setf userinit (pop-option))))
486 ((string= option "--no-userinit")
488 (setf no-userinit t))
489 ((string= option "--eval")
491 (push (cons :eval (pop-option)) reversed-options))
492 ((string= option "--load")
494 (push (cons :load (pop-option)) reversed-options))
495 ((string= option "--noprint")
498 ((string= option "--disable-debugger")
500 (setf disable-debugger t))
501 ((string= option "--end-toplevel-options")
505 ;; Anything we don't recognize as a toplevel
506 ;; option must be the start of user-level
507 ;; options.. except that if we encounter
508 ;; "--end-toplevel-options" after we gave up
509 ;; because we didn't recognize an option as a
510 ;; toplevel option, then the option we gave up on
511 ;; must have been an error. (E.g. in
512 ;; "sbcl --eval '(a)' --eval'(b)' --end-toplevel-options"
513 ;; this test will let us detect that the string
514 ;; "--eval(b)" is an error.)
515 (if (find "--end-toplevel-options" options
517 (startup-error "bad toplevel option: ~S"
520 (/show0 "done with LOOP WHILE OPTIONS DO in TOPLEVEL-INIT")
522 ;; Delete all the options that we processed, so that only
523 ;; user-level options are left visible to user code.
524 (setf (rest *posix-argv*) options)
526 ;; Disable debugger before processing initialization files & co.
527 (when disable-debugger
528 (sb!ext:disable-debugger))
530 ;; Handle initialization files.
531 (/show0 "handling initialization files in TOPLEVEL-INIT")
532 ;; This CATCH is needed for the debugger command TOPLEVEL to
534 (catch 'toplevel-catcher
535 ;; We wrap all the pre-REPL user/system customized startup
536 ;; code in a restart.
538 ;; (Why not wrap everything, even the stuff above, in this
539 ;; restart? Errors above here are basically command line
540 ;; or Unix environment errors, e.g. a missing file or a
541 ;; typo on the Unix command line, and you don't need to
542 ;; get into Lisp to debug them, you should just start over
543 ;; and do it right at the Unix level. Errors below here
544 ;; are generally errors in user Lisp code, and it might be
545 ;; helpful to let the user reach the REPL in order to help
546 ;; figure out what's going on.)
550 (process-init-file sysinit :system))
552 (process-init-file userinit :user))
553 (process-eval/load-options (nreverse reversed-options))
555 (process-script script)
556 (bug "PROCESS-SCRIPT returned")))
561 ;; In case script calls (enable-debugger)!
562 "Abort script, exiting lisp."
563 "Skip to toplevel READ/EVAL/PRINT loop.")
565 (/show0 "CONTINUEing from pre-REPL RESTART-CASE")
566 (values)) ; (no-op, just fall through)
568 :report "Quit SBCL (calling #'QUIT, killing the process)."
569 :test (lambda (c) (declare (ignore c)) (not script))
570 (/show0 "falling through to QUIT from pre-REPL RESTART-CASE")
571 (quit :unix-status 1))))
573 ;; one more time for good measure, in case we fell out of the
574 ;; RESTART-CASE above before one of the flushes in the ordinary
575 ;; flow of control had a chance to operate
576 (flush-standard-output-streams)
578 (/show0 "falling into TOPLEVEL-REPL from TOPLEVEL-INIT")
579 (toplevel-repl noprint)
580 ;; (classic CMU CL error message: "You're certainly a clever child.":-)
581 (critically-unreachable "after TOPLEVEL-REPL")))
583 ;;; hooks to support customized toplevels like ACL-style toplevel from
584 ;;; KMR on sbcl-devel 2002-12-21. Altered by CSR 2003-11-16 for
585 ;;; threaded operation: altered *REPL-FUN* to *REPL-FUN-GENERATOR*.
586 (defvar *repl-read-form-fun* #'repl-read-form-fun
588 "A function of two stream arguments IN and OUT for the toplevel REPL to
589 call: Return the next Lisp form to evaluate (possibly handling other magic --
590 like ACL-style keyword commands -- which precede the next Lisp form). The OUT
591 stream is there to support magic which requires issuing new prompts.")
592 (defvar *repl-prompt-fun* #'repl-prompt-fun
594 "A function of one argument STREAM for the toplevel REPL to call: Prompt
595 the user for input.")
596 (defvar *repl-fun-generator* (constantly #'repl-fun)
598 "A function of no arguments returning a function of one argument NOPRINT
599 that provides the REPL for the system. Assumes that *STANDARD-INPUT* and
600 *STANDARD-OUTPUT* are set up.")
602 ;;; read-eval-print loop for the default system toplevel
603 (defun toplevel-repl (noprint)
604 (/show0 "entering TOPLEVEL-REPL")
605 (let ((* nil) (** nil) (*** nil)
607 (+ nil) (++ nil) (+++ nil)
608 (/// nil) (// nil) (/ nil))
609 (/show0 "about to funcall *REPL-FUN-GENERATOR*")
610 (let ((repl-fun (funcall *repl-fun-generator*)))
611 ;; Each REPL in a multithreaded world should have bindings of
612 ;; most CL specials (most critically *PACKAGE*).
613 (with-rebound-io-syntax
614 (handler-bind ((step-condition 'invoke-stepper))
616 (/show0 "about to set up restarts in TOPLEVEL-REPL")
617 ;; CLHS recommends that there should always be an
618 ;; ABORT restart; we have this one here, and one per
621 (abort "~@<Exit debugger, returning to top level.~@:>")
622 (catch 'toplevel-catcher
623 #!-win32 (sb!unix::reset-signal-mask)
624 ;; In the event of a control-stack-exhausted-error, we
625 ;; should have unwound enough stack by the time we get
626 ;; here that this is now possible.
628 (sb!kernel::protect-control-stack-guard-page 1)
629 (funcall repl-fun noprint)
630 (critically-unreachable "after REPL")))))))))
632 ;;; Our default REPL prompt is the minimal traditional one.
633 (defun repl-prompt-fun (stream)
635 (write-string "* " stream)) ; arbitrary but customary REPL prompt
637 ;;; Our default form reader does relatively little magic, but does
638 ;;; handle the Unix-style EOF-is-end-of-process convention.
639 (defun repl-read-form-fun (in out)
640 (declare (type stream in out) (ignore out))
641 ;; KLUDGE: *READ-SUPPRESS* makes the REPL useless, and cannot be
642 ;; recovered from -- flip it here.
643 (when *read-suppress*
644 (warn "Setting *READ-SUPPRESS* to NIL to restore toplevel usability.")
645 (setf *read-suppress* nil))
646 (let* ((eof-marker (cons nil nil))
647 (form (read in nil eof-marker)))
648 (if (eq form eof-marker)
652 (defun repl-fun (noprint)
653 (/show0 "entering REPL")
657 ;; (See comment preceding the definition of SCRUB-CONTROL-STACK.)
658 (scrub-control-stack)
659 (sb!thread::get-foreground)
661 (flush-standard-output-streams)
662 (funcall *repl-prompt-fun* *standard-output*)
663 ;; (Should *REPL-PROMPT-FUN* be responsible for doing its own
664 ;; FORCE-OUTPUT? I can't imagine a valid reason for it not to
665 ;; be done here, so leaving it up to *REPL-PROMPT-FUN* seems
666 ;; odd. But maybe there *is* a valid reason in some
667 ;; circumstances? perhaps some deadlock issue when being driven
668 ;; by another process or something...)
669 (force-output *standard-output*))
670 (let* ((form (funcall *repl-read-form-fun*
673 (results (multiple-value-list (interactive-eval form))))
675 (dolist (result results)
678 ;; If we started stepping in the debugger we want to stop now.
679 (disable-stepping))))
681 ;;; a convenient way to get into the assembly-level debugger
683 (%primitive sb!c:halt))