(in-package "SB!IMPL")
\f
-(defconstant most-positive-fixnum #.sb!vm:*target-most-positive-fixnum*
- #!+sb-doc
- "The fixnum closest in value to positive infinity.")
+;;;; magic specials initialized by GENESIS
-(defconstant most-negative-fixnum #.sb!vm:*target-most-negative-fixnum*
- #!+sb-doc
- "The fixnum closest in value to negative infinity.")
-\f
-;;;; magic specials initialized by genesis
-
-#!-gengc
+;;; FIXME: The DEFVAR here is redundant with the (DECLAIM (SPECIAL ..))
+;;; of all static symbols in early-impl.lisp.
(progn
- (defvar *current-catch-block*)
- (defvar *current-unwind-protect-block*)
+ (defvar sb!vm::*current-catch-block*)
+ (defvar sb!vm::*current-unwind-protect-block*)
(defvar *free-interrupt-context-index*))
\f
;;; specials initialized by !COLD-INIT
-;;; FIXME: These could be converted to DEFVARs, and the stuff shared
-;;; in both #!+GENGC and #!-GENGC (actually everything in #!+GENGC)
-;;; could be made non-conditional.
-(declaim
- #!-gengc
- (special *gc-inhibit* *already-maybe-gcing*
- *need-to-collect-garbage* *gc-verbose*
- *gc-notify-stream*
- *before-gc-hooks* *after-gc-hooks*
- #!+x86 *pseudo-atomic-atomic*
- #!+x86 *pseudo-atomic-interrupted*
- sb!unix::*interrupts-enabled*
- sb!unix::*interrupt-pending*
- *type-system-initialized*)
- #!+gengc
- (special *gc-verbose* *before-gc-hooks* *after-gc-hooks*
- *gc-notify-stream*
- *type-system-initialized*))
+;;; FIXME: These could be converted to DEFVARs.
+(declaim (special #!+(or x86 x86-64) *pseudo-atomic-bits*
+ *allow-with-interrupts*
+ *interrupts-enabled*
+ *interrupt-pending*
+ *type-system-initialized*))
(defvar *cold-init-complete-p*)
;;; counts of nested errors (with internal errors double-counted)
(defvar *maximum-error-depth*)
(defvar *current-error-depth*)
+
+;;;; default initfiles
+
+(defun sysinit-pathname ()
+ (or (let ((sbcl-homedir (sbcl-homedir-pathname)))
+ (when sbcl-homedir
+ (probe-file (merge-pathnames "sbclrc" sbcl-homedir))))
+ #!+win32
+ (merge-pathnames "sbcl\\sbclrc"
+ (sb!win32::get-folder-pathname
+ sb!win32::csidl_common_appdata))
+ #!-win32
+ "/etc/sbclrc"))
+
+(defun userinit-pathname ()
+ (merge-pathnames ".sbclrc" (user-homedir-pathname)))
+
+(defvar *sysinit-pathname-function* #'sysinit-pathname
+ #!+sb-doc
+ "Designator for a function of zero arguments called to obtain a pathname
+designator for the default sysinit file, or NIL. If the function returns NIL,
+no sysinit file is used unless one has been specified on the command-line.")
+
+(defvar *userinit-pathname-function* #'userinit-pathname
+ #!+sb-doc
+ "Designator for a function of zero arguments called to obtain a pathname
+designator or a stream for the default userinit file, or NIL. If the function
+returns NIL, no userinit file is used unless one has been specified on the
+command-line.")
+
\f
;;;; miscellaneous utilities for working with with TOPLEVEL
;;; by QUIT) is caught and any final processing and return codes are
;;; handled appropriately.
(defmacro handling-end-of-the-world (&body body)
- (let ((caught (gensym "CAUGHT")))
+ (with-unique-names (caught)
`(let ((,caught (catch '%end-of-the-world
- (/show0 "inside CATCH '%END-OF-THE-WORLD")
- ,@body)))
- (/show0 "back from CATCH '%END-OF-THE-WORLD, flushing output")
- (flush-standard-output-streams)
- (/show0 "calling UNIX-EXIT")
- (sb!unix:unix-exit ,caught))))
+ (/show0 "inside CATCH '%END-OF-THE-WORLD")
+ ,@body)))
+ (/show0 "back from CATCH '%END-OF-THE-WORLD, flushing output")
+ (flush-standard-output-streams)
+ (sb!thread::terminate-session)
+ (/show0 "calling UNIX-EXIT")
+ (sb!unix:unix-exit ,caught))))
\f
;;;; working with *CURRENT-ERROR-DEPTH* and *MAXIMUM-ERROR-DEPTH*
-;;; INFINITE-ERROR-PROTECT is used by ERROR and friends to keep us out of
-;;; hyperspace.
+;;; INFINITE-ERROR-PROTECT is used by ERROR and friends to keep us out
+;;; of hyperspace.
(defmacro infinite-error-protect (&rest forms)
`(unless (infinite-error-protector)
+ (/show0 "back from INFINITE-ERROR-PROTECTOR")
(let ((*current-error-depth* (1+ *current-error-depth*)))
+ (/show0 "in INFINITE-ERROR-PROTECT, incremented error depth")
+ ;; arbitrary truncation
+ #!+sb-show (sb!debug:backtrace 8)
,@forms)))
;;; a helper function for INFINITE-ERROR-PROTECT
(defun infinite-error-protector ()
+ (/show0 "entering INFINITE-ERROR-PROTECTOR, *CURRENT-ERROR-DEPTH*=..")
+ (/hexstr *current-error-depth*)
(cond ((not *cold-init-complete-p*)
- (%primitive print "Argh! error in cold init, halting")
- (%primitive sb!c:halt))
- ((or (not (boundp '*current-error-depth*))
- (not (realp *current-error-depth*))
- (not (boundp '*maximum-error-depth*))
- (not (realp *maximum-error-depth*)))
- (%primitive print "Argh! corrupted error depth, halting")
- (%primitive sb!c:halt))
- ((> *current-error-depth* *maximum-error-depth*)
- (/show0 "in INFINITE-ERROR-PROTECTOR, calling ERROR-ERROR")
- (error-error "Help! "
- *current-error-depth*
- " nested errors. "
- "KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.")
- t)
- (t
- nil)))
+ (%primitive print "Argh! error in cold init, halting")
+ (%primitive sb!c:halt))
+ ((or (not (boundp '*current-error-depth*))
+ (not (realp *current-error-depth*))
+ (not (boundp '*maximum-error-depth*))
+ (not (realp *maximum-error-depth*)))
+ (%primitive print "Argh! corrupted error depth, halting")
+ (%primitive sb!c:halt))
+ ((> *current-error-depth* *maximum-error-depth*)
+ (/show0 "*MAXIMUM-ERROR-DEPTH*=..")
+ (/hexstr *maximum-error-depth*)
+ (/show0 "in INFINITE-ERROR-PROTECTOR, calling ERROR-ERROR")
+ (error-error "Help! "
+ *current-error-depth*
+ " nested errors. "
+ "SB-KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.")
+ t)
+ (t
+ (/show0 "returning normally from INFINITE-ERROR-PROTECTOR")
+ nil)))
;;; FIXME: I had a badly broken version of INFINITE-ERROR-PROTECTOR at
;;; one point (shown below), and SBCL cross-compiled it without
#|
(defun infinite-error-protector ()
`(cond ((not *cold-init-complete-p*)
- (%primitive print "Argh! error in cold init, halting")
- (%primitive sb!c:halt))
- ((or (not (boundp '*current-error-depth*))
- (not (realp *current-error-depth*))
- (not (boundp '*maximum-error-depth*))
- (not (realp *maximum-error-depth*)))
- (%primitive print "Argh! corrupted error depth, halting")
- (%primitive sb!c:halt))
- ((> *current-error-depth* *maximum-error-depth*)
- (/show0 "in INFINITE-ERROR-PROTECTOR, calling ERROR-ERROR")
- (error-error "Help! "
- *current-error-depth*
- " nested errors. "
- "KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.")
- (progn ,@forms)
- t)
- (t
- (/show0 "in INFINITE-ERROR-PROTECTOR, returning normally")
- nil)))
+ (%primitive print "Argh! error in cold init, halting")
+ (%primitive sb!c:halt))
+ ((or (not (boundp '*current-error-depth*))
+ (not (realp *current-error-depth*))
+ (not (boundp '*maximum-error-depth*))
+ (not (realp *maximum-error-depth*)))
+ (%primitive print "Argh! corrupted error depth, halting")
+ (%primitive sb!c:halt))
+ ((> *current-error-depth* *maximum-error-depth*)
+ (/show0 "in INFINITE-ERROR-PROTECTOR, calling ERROR-ERROR")
+ (error-error "Help! "
+ *current-error-depth*
+ " nested errors. "
+ "SB-KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.")
+ (progn ,@forms)
+ t)
+ (t
+ (/show0 "in INFINITE-ERROR-PROTECTOR, returning normally")
+ nil)))
|#
\f
;;;; miscellaneous external functions
-#!-mp ; The multi-processing version is defined in multi-proc.lisp.
(defun sleep (n)
#!+sb-doc
"This function causes execution to be suspended for N seconds. N may
be any non-negative, non-complex number."
(when (or (not (realp n))
- (minusp n))
- (error "Invalid argument to SLEEP: ~S.~%~
- Must be a non-negative, non-complex number."
- n))
- (multiple-value-bind (sec usec)
+ (minusp n))
+ (error 'simple-type-error
+ :format-control "invalid argument to SLEEP: ~S"
+ :format-arguments (list n)
+ :datum n
+ :expected-type '(real 0)))
+ #!-win32
+ (multiple-value-bind (sec nsec)
(if (integerp n)
- (values n 0)
- (multiple-value-bind (sec frac)
- (truncate n)
- (values sec(truncate frac 1e-6))))
- (sb!unix:unix-select 0 0 0 0 sec usec))
+ (values n 0)
+ (multiple-value-bind (sec frac)
+ (truncate n)
+ (values sec (truncate frac 1e-9))))
+ (sb!unix:nanosleep sec nsec))
+ #!+win32
+ (sb!win32:millisleep (truncate (* n 1000)))
nil)
\f
;;;; SCRUB-CONTROL-STACK
(defconstant bytes-per-scrub-unit 2048)
+;;; Zero the unused portion of the control stack so that old objects
+;;; are not kept alive because of uninitialized stack variables.
+
+;;; "To summarize the problem, since not all allocated stack frame
+;;; slots are guaranteed to be written by the time you call an another
+;;; function or GC, there may be garbage pointers retained in your
+;;; dead stack locations. The stack scrubbing only affects the part
+;;; of the stack from the SP to the end of the allocated stack."
+;;; - ram, on cmucl-imp, Tue, 25 Sep 2001
+
+;;; So, as an (admittedly lame) workaround, from time to time we call
+;;; scrub-control-stack to zero out all the unused portion. This is
+;;; supposed to happen when the stack is mostly empty, so that we have
+;;; a chance of clearing more of it: callers are currently (2002.07.18)
+;;; REPL and SUB-GC
+
(defun scrub-control-stack ()
- #!+sb-doc
- "Zero the unused portion of the control stack so that old objects are not
- kept alive because of uninitialized stack variables."
- ;; FIXME: Why do we need to do this instead of just letting GC read
- ;; the stack pointer and avoid messing with the unused portion of
- ;; the control stack? (Is this a multithreading thing where there's
- ;; one control stack and stack pointer per thread, and it might not
- ;; be easy to tell what a thread's stack pointer value is when
- ;; looking in from another thread?)
(declare (optimize (speed 3) (safety 0))
- (values (unsigned-byte 20))) ; FIXME: DECLARE VALUES?
-
- #!-x86 ; machines where stack grows upwards (I guess) -- WHN 19990906
- (labels
- ((scrub (ptr offset count)
- (declare (type system-area-pointer ptr)
- (type (unsigned-byte 16) offset)
- (type (unsigned-byte 20) count)
- (values (unsigned-byte 20)))
- (cond ((= offset bytes-per-scrub-unit)
- (look (sap+ ptr bytes-per-scrub-unit) 0 count))
- (t
- (setf (sap-ref-32 ptr offset) 0)
- (scrub ptr (+ offset sb!vm:word-bytes) count))))
- (look (ptr offset count)
- (declare (type system-area-pointer ptr)
- (type (unsigned-byte 16) offset)
- (type (unsigned-byte 20) count)
- (values (unsigned-byte 20)))
- (cond ((= offset bytes-per-scrub-unit)
- count)
- ((zerop (sap-ref-32 ptr offset))
- (look ptr (+ offset sb!vm:word-bytes) count))
- (t
- (scrub ptr offset (+ count sb!vm:word-bytes))))))
- (let* ((csp (sap-int (sb!c::control-stack-pointer-sap)))
- (initial-offset (logand csp (1- bytes-per-scrub-unit))))
- (declare (type (unsigned-byte 32) csp))
+ (values (unsigned-byte 20))) ; FIXME: DECLARE VALUES?
+
+ #!-stack-grows-downward-not-upward
+ (let* ((csp (sap-int (sb!c::control-stack-pointer-sap)))
+ (initial-offset (logand csp (1- bytes-per-scrub-unit)))
+ (end-of-stack
+ (- (sap-int (sb!di::descriptor-sap sb!vm:*control-stack-end*))
+ sb!c:*backend-page-size*)))
+ (labels
+ ((scrub (ptr offset count)
+ (declare (type system-area-pointer ptr)
+ (type (unsigned-byte 16) offset)
+ (type (unsigned-byte 20) count)
+ (values (unsigned-byte 20)))
+ (cond ((>= (sap-int ptr) end-of-stack) 0)
+ ((= offset bytes-per-scrub-unit)
+ (look (sap+ ptr bytes-per-scrub-unit) 0 count))
+ (t
+ (setf (sap-ref-word ptr offset) 0)
+ (scrub ptr (+ offset sb!vm:n-word-bytes) count))))
+ (look (ptr offset count)
+ (declare (type system-area-pointer ptr)
+ (type (unsigned-byte 16) offset)
+ (type (unsigned-byte 20) count)
+ (values (unsigned-byte 20)))
+ (cond ((>= (sap-int ptr) end-of-stack) 0)
+ ((= offset bytes-per-scrub-unit)
+ count)
+ ((zerop (sap-ref-word ptr offset))
+ (look ptr (+ offset sb!vm:n-word-bytes) count))
+ (t
+ (scrub ptr offset (+ count sb!vm:n-word-bytes))))))
+ (declare (type sb!vm::word csp))
(scrub (int-sap (- csp initial-offset))
- (* (floor initial-offset sb!vm:word-bytes) sb!vm:word-bytes)
- 0)))
-
- #!+x86 ;; (Stack grows downwards.)
- (labels
- ((scrub (ptr offset count)
- (declare (type system-area-pointer ptr)
- (type (unsigned-byte 16) offset)
- (type (unsigned-byte 20) count)
- (values (unsigned-byte 20)))
- (let ((loc (int-sap (- (sap-int ptr) (+ offset sb!vm:word-bytes)))))
- (cond ((= offset bytes-per-scrub-unit)
- (look (int-sap (- (sap-int ptr) bytes-per-scrub-unit))
- 0 count))
- (t ;; need to fix bug in %SET-STACK-REF
- (setf (sap-ref-32 loc 0) 0)
- (scrub ptr (+ offset sb!vm:word-bytes) count)))))
- (look (ptr offset count)
- (declare (type system-area-pointer ptr)
- (type (unsigned-byte 16) offset)
- (type (unsigned-byte 20) count)
- (values (unsigned-byte 20)))
- (let ((loc (int-sap (- (sap-int ptr) offset))))
- (cond ((= offset bytes-per-scrub-unit)
- count)
- ((zerop (sb!kernel::get-lisp-obj-address (stack-ref loc 0)))
- (look ptr (+ offset sb!vm:word-bytes) count))
- (t
- (scrub ptr offset (+ count sb!vm:word-bytes)))))))
- (let* ((csp (sap-int (sb!c::control-stack-pointer-sap)))
- (initial-offset (logand csp (1- bytes-per-scrub-unit))))
- (declare (type (unsigned-byte 32) csp))
+ (* (floor initial-offset sb!vm:n-word-bytes) sb!vm:n-word-bytes)
+ 0)))
+
+ #!+stack-grows-downward-not-upward
+ (let* ((csp (sap-int (sb!c::control-stack-pointer-sap)))
+ (end-of-stack (+ (sap-int (sb!di::descriptor-sap sb!vm:*control-stack-start*))
+ sb!c:*backend-page-size*))
+ (initial-offset (logand csp (1- bytes-per-scrub-unit))))
+ (labels
+ ((scrub (ptr offset count)
+ (declare (type system-area-pointer ptr)
+ (type (unsigned-byte 16) offset)
+ (type (unsigned-byte 20) count)
+ (values (unsigned-byte 20)))
+ (let ((loc (int-sap (- (sap-int ptr) (+ offset sb!vm:n-word-bytes)))))
+ (cond ((< (sap-int loc) end-of-stack) 0)
+ ((= offset bytes-per-scrub-unit)
+ (look (int-sap (- (sap-int ptr) bytes-per-scrub-unit))
+ 0 count))
+ (t ;; need to fix bug in %SET-STACK-REF
+ (setf (sap-ref-word loc 0) 0)
+ (scrub ptr (+ offset sb!vm:n-word-bytes) count)))))
+ (look (ptr offset count)
+ (declare (type system-area-pointer ptr)
+ (type (unsigned-byte 16) offset)
+ (type (unsigned-byte 20) count)
+ (values (unsigned-byte 20)))
+ (let ((loc (int-sap (- (sap-int ptr) offset))))
+ (cond ((< (sap-int loc) end-of-stack) 0)
+ ((= offset bytes-per-scrub-unit)
+ count)
+ ((zerop (sb!kernel::get-lisp-obj-address (stack-ref loc 0)))
+ (look ptr (+ offset sb!vm:n-word-bytes) count))
+ (t
+ (scrub ptr offset (+ count sb!vm:n-word-bytes)))))))
+ (declare (type sb!vm::word csp))
(scrub (int-sap (+ csp initial-offset))
- (* (floor initial-offset sb!vm:word-bytes) sb!vm:word-bytes)
- 0))))
+ (* (floor initial-offset sb!vm:n-word-bytes) sb!vm:n-word-bytes)
+ 0))))
\f
;;;; the default toplevel function
(defvar / nil
#!+sb-doc
- "a list of all the values returned by the most recent top-level EVAL")
+ "a list of all the values returned by the most recent top level EVAL")
(defvar // nil #!+sb-doc "the previous value of /")
(defvar /// nil #!+sb-doc "the previous value of //")
-(defvar * nil #!+sb-doc "the value of the most recent top-level EVAL")
+(defvar * nil #!+sb-doc "the value of the most recent top level EVAL")
(defvar ** nil #!+sb-doc "the previous value of *")
(defvar *** nil #!+sb-doc "the previous value of **")
-(defvar + nil #!+sb-doc "the value of the most recent top-level READ")
+(defvar + nil #!+sb-doc "the value of the most recent top level READ")
(defvar ++ nil #!+sb-doc "the previous value of +")
(defvar +++ nil #!+sb-doc "the previous value of ++")
(defvar - nil #!+sb-doc "the form currently being evaluated")
-(defvar *prompt* "* "
- #!+sb-doc
- "The top-level prompt string. This also may be a function of no arguments
- that returns a simple-string.")
(defun interactive-eval (form)
+ #!+sb-doc
"Evaluate FORM, returning whatever it returns and adjusting ***, **, *,
- +++, ++, +, ///, //, /, and -."
++++, ++, +, ///, //, /, and -."
(setf - form)
- (let ((results (multiple-value-list (eval form))))
- (setf /// //
- // /
- / results
- *** **
- ** *
- * (car results)))
- (setf +++ ++
- ++ +
- + -)
+ (unwind-protect
+ (let ((results (multiple-value-list (eval form))))
+ (setf /// //
+ // /
+ / results
+ *** **
+ ** *
+ * (car results)))
+ (setf +++ ++
+ ++ +
+ + -))
(unless (boundp '*)
;; The bogon returned an unbound marker.
;; FIXME: It would be safer to check every one of the values in RESULTS,
;; instead of just the first one.
(setf * nil)
(cerror "Go on with * set to NIL."
- "EVAL returned an unbound marker."))
+ "EVAL returned an unbound marker."))
(values-list /))
;;; Flush anything waiting on one of the ANSI Common Lisp standard
;;; output streams before proceeding.
(defun flush-standard-output-streams ()
(dolist (name '(*debug-io*
- *error-output*
- *query-io*
- *standard-output*
- *trace-output*))
- (finish-output (symbol-value name)))
+ *error-output*
+ *query-io*
+ *standard-output*
+ *trace-output*
+ *terminal-io*))
+ ;; FINISH-OUTPUT may block more easily than FORCE-OUTPUT
+ (force-output (symbol-value name)))
(values))
-;;; the default system top-level function
-(defun toplevel-init ()
+(defun process-init-file (specified-pathname default-function)
+ (restart-case
+ (let ((cookie (list)))
+ (flet ((process-stream (stream &optional pathname)
+ (loop
+ (restart-case
+ (handler-bind
+ ((error (lambda (e)
+ (error "Error during processing of ~
+ initialization file ~A:~%~% ~A"
+ (or pathname stream) e))))
+ (let ((form (read stream nil cookie)))
+ (if (eq cookie form)
+ (return-from process-init-file nil)
+ (eval form))))
+ (continue ()
+ :report "Ignore and continue processing.")))))
+ (if specified-pathname
+ (with-open-file (stream (parse-native-namestring specified-pathname)
+ :if-does-not-exist nil)
+ (if stream
+ (process-stream stream (pathname stream))
+ (error "The specified init file ~S was not found."
+ specified-pathname)))
+ (let ((default (funcall default-function)))
+ (when default
+ (with-open-file (stream (pathname default) :if-does-not-exist nil)
+ (when stream
+ (process-stream stream (pathname stream)))))))))
+ (abort ()
+ :report "Skip this initialization file.")))
+
+(defun process-eval-options (eval-strings-or-forms)
+ (/show0 "handling --eval options")
+ (flet ((process-1 (string-or-form)
+ (etypecase string-or-form
+ (string
+ (multiple-value-bind (expr pos) (read-from-string string-or-form)
+ (unless (eq string-or-form
+ (read-from-string string-or-form nil string-or-form
+ :start pos))
+ (error "More than one expression in ~S" string-or-form))
+ (eval expr)
+ (flush-standard-output-streams)))
+ (cons (eval string-or-form) (flush-standard-output-streams)))))
+ (restart-case
+ (dolist (expr-as-string-or-form eval-strings-or-forms)
+ (/show0 "handling one --eval option")
+ (restart-case
+ (handler-bind
+ ((error (lambda (e)
+ (error "Error during processing of --eval ~
+ option ~S:~%~% ~A"
+ expr-as-string-or-form e))))
+ (process-1 expr-as-string-or-form))
+ (continue ()
+ :report "Ignore and continue with next --eval option.")))
+ (abort ()
+ :report "Skip rest of --eval options."))))
+
+;; Errors while processing the command line cause the system to QUIT,
+;; instead of trying to go into the Lisp debugger, because trying to
+;; go into the Lisp debugger would get into various annoying issues of
+;; where we should go after the user tries to return from the
+;; debugger.
+(defun startup-error (control-string &rest args)
+ (format *error-output*
+ "fatal error before reaching READ-EVAL-PRINT loop: ~% ~?~%"
+ control-string
+ args)
+ (quit :unix-status 1))
+;;; the default system top level function
+(defun toplevel-init ()
(/show0 "entering TOPLEVEL-INIT")
-
- (let ((sysinit nil) ; value of --sysinit option
- (userinit nil) ; value of --userinit option
- (evals nil) ; values of --eval options (in reverse order)
- (noprint nil) ; Has a --noprint option been seen?
- (noprogrammer nil) ; Has a --noprogammer option been seen?
- (options (rest *posix-argv*))) ; skipping program name
+ (let ( ;; value of --sysinit option
+ (sysinit nil)
+ ;; t if --no-sysinit option given
+ (no-sysinit nil)
+ ;; value of --userinit option
+ (userinit nil)
+ ;; t if --no-userinit option given
+ (no-userinit nil)
+ ;; values of --eval options, in reverse order; and also any
+ ;; other options (like --load) which're translated into --eval
+ ;;
+ ;; The values are stored as strings, so that they can be
+ ;; passed to READ only after their predecessors have been
+ ;; EVALed, so that things work when e.g. REQUIRE in one EVAL
+ ;; form creates a package referred to in the next EVAL form,
+ ;; except for forms transformed from syntactically-sugary
+ ;; switches like --load and --disable-debugger.
+ (reversed-evals nil)
+ ;; Has a --noprint option been seen?
+ (noprint nil)
+ ;; everything in *POSIX-ARGV* except for argv[0]=programname
+ (options (rest *posix-argv*)))
+
+ (declare (type list options))
(/show0 "done with outer LET in TOPLEVEL-INIT")
-
- ;; FIXME: There are lots of ways for errors to happen around here (e.g. bad
- ;; command line syntax, or READ-ERROR while trying to READ an --eval
- ;; string). Make sure that they're handled reasonably.
- ;; Parse command line options.
+ ;; FIXME: There are lots of ways for errors to happen around here
+ ;; (e.g. bad command line syntax, or READ-ERROR while trying to
+ ;; READ an --eval string). Make sure that they're handled
+ ;; reasonably.
+
+ ;; Process command line options.
(loop while options do
- (/show0 "at head of LOOP WHILE OPTIONS DO in TOPLEVEL-INIT")
- (let ((option (first options)))
- (flet ((pop-option ()
- (if options
- (pop options)
- (error "unexpected end of command line options"))))
- (cond ((string= option "--sysinit")
- (pop-option)
- (if sysinit
- (error "multiple --sysinit options")
- (setf sysinit (pop-option))))
- ((string= option "--userinit")
- (pop-option)
- (if userinit
- (error "multiple --userinit options")
- (setf userinit (pop-option))))
- ((string= option "--eval")
- (pop-option)
- (let ((eval-as-string (pop-option)))
- (with-input-from-string (eval-stream eval-as-string)
- (let* ((eof-marker (cons :eof :eof))
- (eval (read eval-stream nil eof-marker))
- (eof (read eval-stream nil eof-marker)))
- (cond ((eq eval eof-marker)
- (error "unable to parse ~S"
- eval-as-string))
- ((not (eq eof eof-marker))
- (error "more than one expression in ~S"
- eval-as-string))
- (t
- (push eval evals)))))))
- ((string= option "--noprint")
- (pop-option)
- (setf noprint t))
- ((string= option "--noprogrammer")
- (pop-option)
- (setf noprogrammer t))
- ((string= option "--end-toplevel-options")
- (pop-option)
- (return))
- (t
- ;; Anything we don't recognize as a toplevel
- ;; option must be the start of user-level
- ;; options.. except that if we encounter
- ;; "--end-toplevel-options" after we gave up
- ;; because we didn't recognize an option as a
- ;; toplevel option, then the option we gave up on
- ;; must have been an error. (E.g. in
- ;; sbcl --eval '(a)' --evl '(b)' --end-toplevel-options
- ;; this test will let us detect that "--evl" is
- ;; an error.)
- (if (find "--end-toplevel-options" options
- :test #'string=)
- (error "bad toplevel option: ~S" (first options))
- (return)))))))
+ (/show0 "at head of LOOP WHILE OPTIONS DO in TOPLEVEL-INIT")
+ (let ((option (first options)))
+ (flet ((pop-option ()
+ (if options
+ (pop options)
+ (startup-error
+ "unexpected end of command line options"))))
+ (cond ((string= option "--sysinit")
+ (pop-option)
+ (if sysinit
+ (startup-error "multiple --sysinit options")
+ (setf sysinit (pop-option))))
+ ((string= option "--no-sysinit")
+ (pop-option)
+ (setf no-sysinit t))
+ ((string= option "--userinit")
+ (pop-option)
+ (if userinit
+ (startup-error "multiple --userinit options")
+ (setf userinit (pop-option))))
+ ((string= option "--no-userinit")
+ (pop-option)
+ (setf no-userinit t))
+ ((string= option "--eval")
+ (pop-option)
+ (push (pop-option) reversed-evals))
+ ((string= option "--load")
+ (pop-option)
+ (push
+ (list 'cl:load (native-pathname (pop-option)))
+ reversed-evals))
+ ((string= option "--noprint")
+ (pop-option)
+ (setf noprint t))
+ ((string= option "--disable-debugger")
+ (pop-option)
+ (push (list 'sb!ext:disable-debugger) reversed-evals))
+ ((string= option "--end-toplevel-options")
+ (pop-option)
+ (return))
+ (t
+ ;; Anything we don't recognize as a toplevel
+ ;; option must be the start of user-level
+ ;; options.. except that if we encounter
+ ;; "--end-toplevel-options" after we gave up
+ ;; because we didn't recognize an option as a
+ ;; toplevel option, then the option we gave up on
+ ;; must have been an error. (E.g. in
+ ;; "sbcl --eval '(a)' --eval'(b)' --end-toplevel-options"
+ ;; this test will let us detect that the string
+ ;; "--eval(b)" is an error.)
+ (if (find "--end-toplevel-options" options
+ :test #'string=)
+ (startup-error "bad toplevel option: ~S"
+ (first options))
+ (return)))))))
(/show0 "done with LOOP WHILE OPTIONS DO in TOPLEVEL-INIT")
- ;; Excise all the options that we processed, so that only user-level
- ;; options are left visible to user code.
+ ;; Delete all the options that we processed, so that only
+ ;; user-level options are left visible to user code.
(setf (rest *posix-argv*) options)
- ;; FIXME: Verify that errors in init files and/or --eval operations
- ;; lead to reasonable behavior.
-
;; Handle initialization files.
(/show0 "handling initialization files in TOPLEVEL-INIT")
- (flet (;; If any of POSSIBLE-INIT-FILE-NAMES names a real file,
- ;; return its truename.
- (probe-init-files (&rest possible-init-file-names)
- (/show0 "entering PROBE-INIT-FILES")
- (prog1
- (find-if (lambda (x)
- (and (stringp x) (probe-file x)))
- possible-init-file-names)
- (/show0 "leaving PROBE-INIT-FILES"))))
- (let* ((sbcl-home (posix-getenv "SBCL_HOME"))
- (sysinit-truename (if sbcl-home
- (probe-init-files sysinit
- (concatenate
- 'string
- sbcl-home
- "/sbclrc"))
- (probe-init-files sysinit
- "/etc/sbclrc"
- "/usr/local/etc/sbclrc")))
- (user-home (or (posix-getenv "HOME")
- (error "The HOME environment variable is unbound, ~
- so user init file can't be found.")))
- (userinit-truename (probe-init-files userinit
- (concatenate
- 'string
- user-home
- "/.sbclrc"))))
- (/show0 "assigned SYSINIT-TRUENAME and USERINIT-TRUENAME")
- (when sysinit-truename
- (unless (load sysinit-truename)
- (error "~S was not successfully loaded." sysinit-truename))
- (flush-standard-output-streams))
- (/show0 "loaded SYSINIT-TRUENAME")
- (when userinit-truename
- (unless (load userinit-truename)
- (error "~S was not successfully loaded." userinit-truename))
- (flush-standard-output-streams))
- (/show0 "loaded USERINIT-TRUENAME"))
-
- ;; Handle --eval options.
- (/show0 "handling --eval options in TOPLEVEL-INIT")
- (dolist (eval (reverse evals))
- (/show0 "handling one --eval option in TOPLEVEL-INIT")
- (eval eval)
- (flush-standard-output-streams))
-
- ;; Handle stream binding controlled by --noprogrammer option.
+ ;; This CATCH is needed for the debugger command TOPLEVEL to
+ ;; work.
+ (catch 'toplevel-catcher
+ ;; We wrap all the pre-REPL user/system customized startup
+ ;; code in a restart.
;;
- ;; FIXME: When we do actually implement this, shouldn't it go
- ;; earlier in the sequence, so that its stream bindings will
- ;; affect the behavior of init files and --eval options?
- (/show0 "handling --noprogrammer option in TOPLEVEL-INIT")
- (when noprogrammer
- (warn "stub: --noprogrammer option unimplemented")) ; FIXME
+ ;; (Why not wrap everything, even the stuff above, in this
+ ;; restart? Errors above here are basically command line
+ ;; or Unix environment errors, e.g. a missing file or a
+ ;; typo on the Unix command line, and you don't need to
+ ;; get into Lisp to debug them, you should just start over
+ ;; and do it right at the Unix level. Errors below here
+ ;; are generally errors in user Lisp code, and it might be
+ ;; helpful to let the user reach the REPL in order to help
+ ;; figure out what's going on.)
+ (restart-case
+ (progn
+ (unless no-sysinit
+ (process-init-file sysinit *sysinit-pathname-function*))
+ (unless no-userinit
+ (process-init-file userinit *userinit-pathname-function*))
+ (process-eval-options (nreverse reversed-evals)))
+ (abort ()
+ :report "Skip to toplevel READ/EVAL/PRINT loop."
+ (/show0 "CONTINUEing from pre-REPL RESTART-CASE")
+ (values)) ; (no-op, just fall through)
+ (quit ()
+ :report "Quit SBCL (calling #'QUIT, killing the process)."
+ (/show0 "falling through to QUIT from pre-REPL RESTART-CASE")
+ (quit :unix-status 1))))
- (/show0 "falling into TOPLEVEL-REPL from TOPLEVEL-INIT")
- (toplevel-repl noprint))))
+ ;; one more time for good measure, in case we fell out of the
+ ;; RESTART-CASE above before one of the flushes in the ordinary
+ ;; flow of control had a chance to operate
+ (flush-standard-output-streams)
+
+ (/show0 "falling into TOPLEVEL-REPL from TOPLEVEL-INIT")
+ (toplevel-repl noprint)
+ ;; (classic CMU CL error message: "You're certainly a clever child.":-)
+ (critically-unreachable "after TOPLEVEL-REPL")))
+
+;;; hooks to support customized toplevels like ACL-style toplevel from
+;;; KMR on sbcl-devel 2002-12-21. Altered by CSR 2003-11-16 for
+;;; threaded operation: altered *REPL-FUN* to *REPL-FUN-GENERATOR*.
+(defvar *repl-read-form-fun* #'repl-read-form-fun
+ #!+sb-doc
+ "A function of two stream arguments IN and OUT for the toplevel REPL to
+call: Return the next Lisp form to evaluate (possibly handling other magic --
+like ACL-style keyword commands -- which precede the next Lisp form). The OUT
+stream is there to support magic which requires issuing new prompts.")
+(defvar *repl-prompt-fun* #'repl-prompt-fun
+ #!+sb-doc
+ "A function of one argument STREAM for the toplevel REPL to call: Prompt
+the user for input.")
+(defvar *repl-fun-generator* (constantly #'repl-fun)
+ #!+sb-doc
+ "A function of no arguments returning a function of one argument NOPRINT
+that provides the REPL for the system. Assumes that *STANDARD-INPUT* and
+*STANDARD-OUTPUT* are set up.")
;;; read-eval-print loop for the default system toplevel
(defun toplevel-repl (noprint)
(/show0 "entering TOPLEVEL-REPL")
(let ((* nil) (** nil) (*** nil)
- (- nil)
- (+ nil) (++ nil) (+++ nil)
- (/// nil) (// nil) (/ nil)
- (eof-marker (cons :eof nil)))
- (loop
- (/show0 "at head of outer LOOP in TOPLEVEL-REPL")
- ;; There should only be one TOPLEVEL restart, and it's here, so
- ;; restarting at TOPLEVEL always bounces you all the way out here.
- (with-simple-restart (toplevel
- "Restart at toplevel READ/EVAL/PRINT loop.")
- ;; We add a new ABORT restart for every debugger level, so
- ;; restarting at ABORT in a nested debugger gets you out to the
- ;; innermost enclosing debugger, and only when you're in the
- ;; outermost, unnested debugger level does restarting at ABORT
- ;; get you out to here.
- (with-simple-restart (abort
- "Reduce debugger level (leaving debugger).")
- (catch 'top-level-catcher
- (sb!unix:unix-sigsetmask 0) ; FIXME: What is this for?
- (/show0 "about to enter inner LOOP in TOPLEVEL-REPL")
- (loop ; FIXME: Do we need this inner LOOP?
- ;; FIXME: It seems bad to have GC behavior depend on scrubbing
- ;; the control stack before each interactive command. Isn't
- ;; there some way we can convince the GC to just ignore
- ;; dead areas of the control stack, so that we don't need to
- ;; rely on this half-measure?
- (scrub-control-stack)
- (unless noprint
- (fresh-line)
- (princ (if (functionp *prompt*)
- (funcall *prompt*)
- *prompt*))
- (flush-standard-output-streams))
- (let ((form (read *standard-input* nil eof-marker)))
- (if (eq form eof-marker)
- (quit)
- (let ((results
- (multiple-value-list (interactive-eval form))))
- (unless noprint
- (dolist (result results)
- (fresh-line)
- (prin1 result)))))))))))))
+ (- nil)
+ (+ nil) (++ nil) (+++ nil)
+ (/// nil) (// nil) (/ nil))
+ (/show0 "about to funcall *REPL-FUN-GENERATOR*")
+ (let ((repl-fun (funcall *repl-fun-generator*)))
+ ;; Each REPL in a multithreaded world should have bindings of
+ ;; most CL specials (most critically *PACKAGE*).
+ (with-rebound-io-syntax
+ (handler-bind ((step-condition 'invoke-stepper))
+ (loop
+ (/show0 "about to set up restarts in TOPLEVEL-REPL")
+ ;; CLHS recommends that there should always be an
+ ;; ABORT restart; we have this one here, and one per
+ ;; debugger level.
+ (with-simple-restart
+ (abort "~@<Exit debugger, returning to top level.~@:>")
+ (catch 'toplevel-catcher
+ #!-win32 (sb!unix::reset-signal-mask)
+ ;; In the event of a control-stack-exhausted-error, we
+ ;; should have unwound enough stack by the time we get
+ ;; here that this is now possible.
+ #!-win32
+ (sb!kernel::protect-control-stack-guard-page 1)
+ (funcall repl-fun noprint)
+ (critically-unreachable "after REPL")))))))))
+
+;;; Our default REPL prompt is the minimal traditional one.
+(defun repl-prompt-fun (stream)
+ (fresh-line stream)
+ (write-string "* " stream)) ; arbitrary but customary REPL prompt
+
+;;; Our default form reader does relatively little magic, but does
+;;; handle the Unix-style EOF-is-end-of-process convention.
+(defun repl-read-form-fun (in out)
+ (declare (type stream in out) (ignore out))
+ (let* ((eof-marker (cons nil nil))
+ (form (read in nil eof-marker)))
+ (if (eq form eof-marker)
+ (quit)
+ form)))
+
+(defun repl-fun (noprint)
+ (/show0 "entering REPL")
+ (loop
+ (unwind-protect
+ (progn
+ ;; (See comment preceding the definition of SCRUB-CONTROL-STACK.)
+ (scrub-control-stack)
+ (sb!thread::get-foreground)
+ (unless noprint
+ (flush-standard-output-streams)
+ (funcall *repl-prompt-fun* *standard-output*)
+ ;; (Should *REPL-PROMPT-FUN* be responsible for doing its own
+ ;; FORCE-OUTPUT? I can't imagine a valid reason for it not to
+ ;; be done here, so leaving it up to *REPL-PROMPT-FUN* seems
+ ;; odd. But maybe there *is* a valid reason in some
+ ;; circumstances? perhaps some deadlock issue when being driven
+ ;; by another process or something...)
+ (force-output *standard-output*))
+ (let* ((form (funcall *repl-read-form-fun*
+ *standard-input*
+ *standard-output*))
+ (results (multiple-value-list (interactive-eval form))))
+ (unless noprint
+ (dolist (result results)
+ (fresh-line)
+ (prin1 result)))))
+ ;; If we started stepping in the debugger we want to stop now.
+ (disable-stepping))))
\f
;;; a convenient way to get into the assembly-level debugger
(defun %halt ()
projects / sbcl.git / blobdiff