X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Ftoplevel.lisp;h=7cf092132c2ab9993b3bfc1d4114f1f1d888a54d;hb=bea5b384106a6734a4b280a76e8ebdd4d51b5323;hp=d779e572fd8844df9b10b7d1e9ba96e74042d74b;hpb=1de341cf0652fb0eb8354f64d95acb0899811173;p=sbcl.git diff --git a/src/code/toplevel.lisp b/src/code/toplevel.lisp index d779e57..7cf0921 100644 --- a/src/code/toplevel.lisp +++ b/src/code/toplevel.lisp @@ -18,16 +18,14 @@ ;;; 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*)) ;;; specials initialized by !COLD-INIT ;;; FIXME: These could be converted to DEFVARs. -(declaim (special *gc-inhibit* *already-maybe-gcing* - *need-to-collect-garbage* - *gc-notify-stream* +(declaim (special *gc-inhibit* *need-to-collect-garbage* *before-gc-hooks* *after-gc-hooks* #!+x86 *pseudo-atomic-atomic* #!+x86 *pseudo-atomic-interrupted* @@ -40,6 +38,17 @@ ;;; counts of nested errors (with internal errors double-counted) (defvar *maximum-error-depth*) (defvar *current-error-depth*) + +;;;; stepping control +(defvar *step*) +(defvar *stepping*) +(defvar *step-form-stack* nil + "A place for single steppers to push information about +STEP-FORM-CONDITIONS avaiting the corresponding +STEP-VALUES-CONDITIONS. The system is guaranteed to empty the stack +when stepping terminates, so that it remains in sync, but doesn't +modify it in any other way: it is provided for implmentors of single +steppers to maintain contextual information.") ;;;; miscellaneous utilities for working with with TOPLEVEL @@ -47,14 +56,15 @@ ;;; 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 "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)))) ;;;; working with *CURRENT-ERROR-DEPTH* and *MAXIMUM-ERROR-DEPTH* @@ -89,7 +99,7 @@ (error-error "Help! " *current-error-depth* " nested errors. " - "KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.") + "SB-KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.") t) (t (/show0 "returning normally from INFINITE-ERROR-PROTECTOR") @@ -116,7 +126,7 @@ (error-error "Help! " *current-error-depth* " nested errors. " - "KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.") + "SB-KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded.") (progn ,@forms) t) (t @@ -174,7 +184,8 @@ (let* ((csp (sap-int (sb!c::control-stack-pointer-sap))) (initial-offset (logand csp (1- bytes-per-scrub-unit))) (end-of-stack - (- sb!vm::*control-stack-end* sb!c:*backend-page-size*))) + (- (sb!vm:fixnumize sb!vm:*control-stack-end*) + sb!c:*backend-page-size*))) (labels ((scrub (ptr offset count) (declare (type system-area-pointer ptr) @@ -185,7 +196,7 @@ ((= offset bytes-per-scrub-unit) (look (sap+ ptr bytes-per-scrub-unit) 0 count)) (t - (setf (sap-ref-32 ptr offset) 0) + (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) @@ -195,18 +206,19 @@ (cond ((>= (sap-int ptr) end-of-stack) 0) ((= offset bytes-per-scrub-unit) count) - ((zerop (sap-ref-32 ptr offset)) + ((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 (unsigned-byte 32) csp)) + (declare (type sb!vm::word csp)) (scrub (int-sap (- csp initial-offset)) (* (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 (+ sb!vm::*control-stack-start* sb!c:*backend-page-size*)) + (end-of-stack (+ (sb!vm:fixnumize sb!vm:*control-stack-start*) + sb!c:*backend-page-size*)) (initial-offset (logand csp (1- bytes-per-scrub-unit)))) (labels ((scrub (ptr offset count) @@ -220,7 +232,7 @@ (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) + (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) @@ -235,7 +247,7 @@ (look ptr (+ offset sb!vm:n-word-bytes) count)) (t (scrub ptr offset (+ count sb!vm:n-word-bytes))))))) - (declare (type (unsigned-byte 32) csp)) + (declare (type sb!vm::word csp)) (scrub (int-sap (+ csp initial-offset)) (* (floor initial-offset sb!vm:n-word-bytes) sb!vm:n-word-bytes) 0)))) @@ -260,9 +272,9 @@ +++, ++, +, ///, //, /, and -." (setf - form) (let ((results - (multiple-value-list - (eval-in-lexenv form - (make-null-interactive-lexenv))))) + (multiple-value-list + (eval-in-lexenv form + (make-null-interactive-lexenv))))) (setf /// // // / / results @@ -294,16 +306,23 @@ ;;; the default system top level function (defun toplevel-init () - - (/show0 "entering TOPLEVEL-INIT") - (setf sb!thread::*session-lock* (sb!thread:make-mutex :name "the terminal")) - (sb!thread::get-foreground) - (let ((sysinit nil) ; value of --sysinit option - (userinit nil) ; value of --userinit option - (reversed-evals nil) ; values of --eval options, in reverse order; and - ; also --load options, translated into --eval - (noprint nil) ; Has a --noprint option been seen? - (options (rest *posix-argv*))) ; skipping program name + (/show0 "entering TOPLEVEL-INIT") + (let (;; value of --sysinit option + (sysinit nil) + ;; value of --userinit option + (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. + (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)) @@ -312,170 +331,196 @@ ;; 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. Also, perhaps all errors while parsing the command - ;; line should cause the system to QUIT, instead of trying to go - ;; into the Lisp debugger, since trying to go into the debugger - ;; gets into various annoying issues of where we should go after - ;; the user tries to return from the debugger. + ;; reasonably. - ;; Parse 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 reversed-evals))))))) - ((string= option "--load") - (pop-option) - (push `(load ,(pop-option)) reversed-evals)) - ((string= option "--noprint") - (pop-option) - (setf noprint t)) - ;; FIXME: --noprogrammer was deprecated in 0.7.5, and - ;; in a year or so this backwards compatibility can - ;; go away. - ((string= option "--noprogrammer") - (warn "treating deprecated --noprogrammer as --disable-debugger") - (pop-option) - (push '(disable-debugger) reversed-evals)) - ((string= option "--disable-debugger") - (pop-option) - (push '(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=) - (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. - (setf (rest *posix-argv*) options) - - ;; 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) - (declare (type list 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")))) - - ;; We wrap all the pre-REPL user/system customized startup code - ;; in a restart. - ;; - ;; (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 - (flet ((process-init-file (truename) - (when truename - (unless (load truename) - (error "~S was not successfully loaded." truename)) - (flush-standard-output-streams)))) - (process-init-file sysinit-truename) - (process-init-file userinit-truename)) - - ;; Process --eval options. - (/show0 "handling --eval options in TOPLEVEL-INIT") - (dolist (eval (reverse reversed-evals)) - (/show0 "handling one --eval option in TOPLEVEL-INIT") - (eval eval) - (flush-standard-output-streams))) - (continue () - :report - "Continue anyway (skipping 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)))) - - ;; 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")))) - -;;; halt-on-failures and prompt-on-failures modes, suitable for -;;; noninteractive and interactive use respectively -(defun disable-debugger () - (setf *debugger-hook* 'noprogrammer-debugger-hook-fun - *debug-io* *error-output*)) -(defun enable-debugger () - (setf *debugger-hook* nil - *debug-io* *query-io*)) + ;; Process command line options. + (flet (;; 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. + (startup-error (control-string &rest args) + (format + *error-output* + "fatal error before reaching READ-EVAL-PRINT loop: ~% ~?~%" + control-string + args) + (quit :unix-status 1))) + (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) + (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 "--userinit") + (pop-option) + (if userinit + (startup-error "multiple --userinit options") + (setf userinit (pop-option)))) + ((string= option "--eval") + (pop-option) + (push (pop-option) reversed-evals)) + ((string= option "--load") + (pop-option) + (push + ;; FIXME: see BUG 296 + (concatenate 'string "(|LOAD| \"" (pop-option) "\")") + reversed-evals)) + ((string= option "--noprint") + (pop-option) + (setf noprint t)) + ;; FIXME: --noprogrammer was deprecated in 0.7.5, and + ;; in a year or so this backwards compatibility can + ;; go away. + ((string= option "--noprogrammer") + (warn "treating deprecated --noprogrammer as --disable-debugger") + (pop-option) + (push "(|DISABLE-DEBUGGER|)" reversed-evals)) + ((string= option "--disable-debugger") + (pop-option) + (push "(|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") + + ;; Delete all the options that we processed, so that only + ;; user-level options are left visible to user code. + (setf (rest *posix-argv*) options) + + ;; Handle initialization files. + (/show0 "handling initialization files in TOPLEVEL-INIT") + (flet (;; shared idiom for searching for SYSINITish and + ;; USERINITish files + (probe-init-files (explicitly-specified-init-file-name + &rest default-init-file-names) + (declare (type list default-init-file-names)) + (if explicitly-specified-init-file-name + (or (probe-file explicitly-specified-init-file-name) + (startup-error "The file ~S was not found." + explicitly-specified-init-file-name)) + (find-if (lambda (x) + (and (stringp x) (probe-file x))) + default-init-file-names))) + ;; shared idiom for creating default names for + ;; SYSINITish and USERINITish files + (init-file-name (maybe-dir-name basename) + (and maybe-dir-name + (concatenate 'string maybe-dir-name "/" basename)))) + (let ((sysinit-truename + (probe-init-files sysinit + (init-file-name (posix-getenv "SBCL_HOME") + "sbclrc") + "/etc/sbclrc")) + (userinit-truename + (probe-init-files userinit + (init-file-name (posix-getenv "HOME") + ".sbclrc")))) + + ;; We wrap all the pre-REPL user/system customized startup code + ;; in a restart. + ;; + ;; (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 + (flet ((process-init-file (truename) + (when truename + (unless (load truename) + (error "~S was not successfully loaded." + truename)) + (flush-standard-output-streams)))) + (process-init-file sysinit-truename) + (process-init-file userinit-truename)) + + ;; Process --eval options. + (/show0 "handling --eval options in TOPLEVEL-INIT") + (dolist (expr-as-string (reverse reversed-evals)) + (/show0 "handling one --eval option in TOPLEVEL-INIT") + (let ((expr (with-input-from-string (eval-stream + expr-as-string) + (let* ((eof-marker (cons :eof :eof)) + (result (read eval-stream + nil + eof-marker)) + (eof (read eval-stream nil eof-marker))) + (cond ((eq result eof-marker) + (error "unable to parse ~S" + expr-as-string)) + ((not (eq eof eof-marker)) + (error + "more than one expression in ~S" + expr-as-string)) + (t + result)))))) + (eval expr) + (flush-standard-output-streams)))) + (continue () + :report + "Continue anyway (skipping 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)))) + + ;; 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 + "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 + "a function of one argument STREAM for the toplevel REPL to call: Prompt + the user for input.") +(defvar *repl-fun-generator* (constantly #'repl-fun) + "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) @@ -484,34 +529,44 @@ (- nil) (+ nil) (++ nil) (+++ nil) (/// nil) (// nil) (/ nil)) - ;; WITH-SIMPLE-RESTART doesn't actually restart its body as some - ;; (like WHN for an embarrassingly long time ca. 2001-12-07) might - ;; think, but instead drops control back out at the end. So when a - ;; TOPLEVEL or outermost-ABORT restart happens, we need this outer - ;; LOOP wrapper to grab control and start over again. (And it also - ;; wraps CATCH 'TOPLEVEL-CATCHER for similar reasons.) - (loop - (/show0 "about to set up restarts 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 - "~@") - (catch 'toplevel-catcher - #!-sunos (sb!unix:unix-sigsetmask 0) ; FIXME: What is this for? - ;; 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 - (sb!kernel::protect-control-stack-guard-page 1) - (repl noprint) - (critically-unreachable "after REPL"))))))) + (/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)) + (let ((*stepping* nil) + (*step* nil)) + ;; WITH-SIMPLE-RESTART doesn't actually restart its body as + ;; some (like WHN for an embarrassingly long time + ;; ca. 2001-12-07) might think, but instead drops control back + ;; out at the end. So when a TOPLEVEL or outermost-ABORT + ;; restart happens, we need this outer LOOP wrapper to grab + ;; control and start over again. (And it also wraps CATCH + ;; 'TOPLEVEL-CATCHER for similar reasons.) + (loop + (/show0 "about to set up restarts 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 "~@") + (catch 'toplevel-catcher + (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. + (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) @@ -528,93 +583,34 @@ (quit) form))) -;;; hooks to support customized toplevels like ACL-style toplevel -;;; from KMR on sbcl-devel 2002-12-21 -(defvar *repl-read-form-fun* #'repl-read-form-fun - "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 - "a function of one argument STREAM for the toplevel REPL to call: Prompt - the user for input.") - -(defun repl (noprint) +(defun repl-fun (noprint) (/show0 "entering REPL") (loop - ;; (See comment preceding the definition of SCRUB-CONTROL-STACK.) - (scrub-control-stack) - (unless noprint - (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)))))) - -;;; suitable value for *DEBUGGER-HOOK* for a noninteractive Unix-y program -(defun noprogrammer-debugger-hook-fun (condition old-debugger-hook) - (declare (ignore old-debugger-hook)) - (flet ((failure-quit (&key recklessly-p) - (/show0 "in FAILURE-QUIT (in --disable-debugger debugger hook)") - (quit :unix-status 1 :recklessly-p recklessly-p))) - ;; This HANDLER-CASE is here mostly to stop output immediately - ;; (and fall through to QUIT) when there's an I/O error. Thus, - ;; when we're run under a shell script or something, we can die - ;; cleanly when the script dies (and our pipes are cut), instead - ;; of falling into ldb or something messy like that. - (handler-case + (unwind-protect (progn - (format *error-output* - "~&~@~2%" - (type-of condition) - condition) - ;; Flush *ERROR-OUTPUT* even before the BACKTRACE, so that - ;; even if we hit an error within BACKTRACE (e.g. a bug in - ;; the debugger's own frame-walking code, or a bug in a user - ;; PRINT-OBJECT method) we'll at least have the CONDITION - ;; printed out before we die. - (finish-output *error-output*) - ;; (Where to truncate the BACKTRACE is of course arbitrary, but - ;; it seems as though we should at least truncate it somewhere.) - (sb!debug:backtrace 128 *error-output*) - (format - *error-output* - "~%unhandled condition in --disable-debugger mode, quitting~%") - (finish-output *error-output*) - (failure-quit)) - (condition () - ;; We IGNORE-ERRORS here because even %PRIMITIVE PRINT can - ;; fail when our output streams are blown away, as e.g. when - ;; we're running under a Unix shell script and it dies somehow - ;; (e.g. because of a SIGINT). In that case, we might as well - ;; just give it up for a bad job, and stop trying to notify - ;; the user of anything. - ;; - ;; Actually, the only way I've run across to exercise the - ;; problem is to have more than one layer of shell script. - ;; I have a shell script which does - ;; time nice -10 sh make.sh "$1" 2>&1 | tee make.tmp - ;; and the problem occurs when I interrupt this with Ctrl-C - ;; under Linux 2.2.14-5.0 and GNU bash, version 1.14.7(1). - ;; I haven't figured out whether it's bash, time, tee, Linux, or - ;; what that is responsible, but that it's possible at all - ;; means that we should IGNORE-ERRORS here. -- WHN 2001-04-24 - (ignore-errors - (%primitive print - "Argh! error within --disable-debugger error handling")) - (failure-quit :recklessly-p t))))) + ;; (See comment preceding the definition of SCRUB-CONTROL-STACK.) + (scrub-control-stack) + (sb!thread::get-foreground) + (unless noprint + (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. + (setf *stepping* nil + *step* nil)))) ;;; a convenient way to get into the assembly-level debugger (defun %halt ()