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+;;; Repl commands
+
+;; Copyright (C) 2001, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
+
+;; This library is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU Lesser General Public
+;; License as published by the Free Software Foundation; either
+;; version 3 of the License, or (at your option) any later version.
+;;
+;; This library is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; Lesser General Public License for more details.
+;;
+;; You should have received a copy of the GNU Lesser General Public
+;; License along with this library; if not, write to the Free Software
+;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+;; 02110-1301 USA
+
+;;; Code:
+
+(define-module (system repl command)
+ #:use-module (system base syntax)
+ #:use-module (system base pmatch)
+ #:use-module (system base compile)
+ #:use-module (system repl common)
+ #:use-module (system repl debug)
+ #:use-module (system vm disassembler)
+ #:use-module (system vm loader)
+ #:use-module (system vm program)
+ #:use-module (system vm trap-state)
+ #:use-module (system vm vm)
+ #:autoload (system base language) (lookup-language language-reader)
+ #:autoload (system vm trace) (call-with-trace)
+ #:use-module (ice-9 format)
+ #:use-module (ice-9 session)
+ #:use-module (ice-9 documentation)
+ #:use-module (ice-9 and-let-star)
+ #:use-module (ice-9 rdelim)
+ #:use-module (ice-9 control)
+ #:use-module ((ice-9 pretty-print) #:select ((pretty-print . pp)))
+ #:use-module ((system vm inspect) #:select ((inspect . %inspect)))
+ #:use-module (rnrs bytevectors)
+ #:use-module (statprof)
+ #:export (meta-command define-meta-command))
+
+
+;;;
+;;; Meta command interface
+;;;
+
+(define *command-table*
+ '((help (help h) (show) (apropos a) (describe d))
+ (module (module m) (import use) (load l) (reload re) (binding b) (in))
+ (language (language L))
+ (compile (compile c) (compile-file cc)
+ (expand exp) (optimize opt)
+ (disassemble x) (disassemble-file xx))
+ (profile (time t) (profile pr) (trace tr))
+ (debug (backtrace bt) (up) (down) (frame fr)
+ (locals) (error-message error)
+ (break br bp) (break-at-source break-at bs)
+ (step s) (step-instruction si)
+ (next n) (next-instruction ni)
+ (finish)
+ (tracepoint tp)
+ (traps) (delete del) (disable) (enable)
+ (registers regs))
+ (inspect (inspect i) (pretty-print pp))
+ (system (gc) (statistics stat) (option o)
+ (quit q continue cont))))
+
+(define *show-table*
+ '((show (warranty w) (copying c) (version v))))
+
+(define (group-name g) (car g))
+(define (group-commands g) (cdr g))
+
+(define *command-infos* (make-hash-table))
+(define (command-name c) (car c))
+(define (command-abbrevs c) (cdr c))
+(define (command-info c) (hashq-ref *command-infos* (command-name c)))
+(define (command-procedure c) (command-info-procedure (command-info c)))
+(define (command-doc c) (procedure-documentation (command-procedure c)))
+
+(define (make-command-info proc arguments-reader)
+ (cons proc arguments-reader))
+
+(define (command-info-procedure info)
+ (car info))
+
+(define (command-info-arguments-reader info)
+ (cdr info))
+
+(define (command-usage c)
+ (let ((doc (command-doc c)))
+ (substring doc 0 (string-index doc #\newline))))
+
+(define (command-summary c)
+ (let* ((doc (command-doc c))
+ (start (1+ (string-index doc #\newline))))
+ (cond ((string-index doc #\newline start)
+ => (lambda (end) (substring doc start end)))
+ (else (substring doc start)))))
+
+(define (lookup-group name)
+ (assq name *command-table*))
+
+(define* (lookup-command key #:optional (table *command-table*))
+ (let loop ((groups table) (commands '()))
+ (cond ((and (null? groups) (null? commands)) #f)
+ ((null? commands)
+ (loop (cdr groups) (cdar groups)))
+ ((memq key (car commands)) (car commands))
+ (else (loop groups (cdr commands))))))
+
+(define* (display-group group #:optional (abbrev? #t))
+ (format #t "~:(~A~) Commands~:[~; [abbrev]~]:~2%" (group-name group) abbrev?)
+ (for-each (lambda (c)
+ (display-summary (command-usage c)
+ (if abbrev? (command-abbrevs c) '())
+ (command-summary c)))
+ (group-commands group))
+ (newline))
+
+(define (display-command command)
+ (display "Usage: ")
+ (display (command-doc command))
+ (newline))
+
+(define (display-summary usage abbrevs summary)
+ (let* ((usage-len (string-length usage))
+ (abbrevs (if (pair? abbrevs)
+ (format #f "[,~A~{ ,~A~}]" (car abbrevs) (cdr abbrevs))
+ ""))
+ (abbrevs-len (string-length abbrevs)))
+ (format #t " ,~A~A~A - ~A\n"
+ usage
+ (cond
+ ((> abbrevs-len 32)
+ (error "abbrevs too long" abbrevs))
+ ((> (+ usage-len abbrevs-len) 32)
+ (format #f "~%~v_" (+ 2 (- 32 abbrevs-len))))
+ (else
+ (format #f "~v_" (- 32 abbrevs-len usage-len))))
+ abbrevs
+ summary)))
+
+(define (read-command repl)
+ (catch #t
+ (lambda () (read))
+ (lambda (key . args)
+ (pmatch args
+ ((,subr ,msg ,args . ,rest)
+ (format #t "Throw to key `~a' while reading command:\n" key)
+ (display-error #f (current-output-port) subr msg args rest))
+ (else
+ (format #t "Throw to key `~a' with args `~s' while reading command.\n"
+ key args)))
+ (force-output)
+ *unspecified*)))
+
+(define (read-command-arguments c repl)
+ ((command-info-arguments-reader (command-info c)) repl))
+
+(define (meta-command repl)
+ (let ((command (read-command repl)))
+ (cond
+ ((eq? command *unspecified*)) ; read error, already signalled; pass.
+ ((not (symbol? command))
+ (format #t "Meta-command not a symbol: ~s~%" command))
+ ((lookup-command command)
+ => (lambda (c)
+ (and=> (read-command-arguments c repl)
+ (lambda (args) (apply (command-procedure c) repl args)))))
+ (else
+ (format #t "Unknown meta command: ~A~%" command)))))
+
+(define (add-meta-command! name category proc argument-reader)
+ (hashq-set! *command-infos* name (make-command-info proc argument-reader))
+ (if category
+ (let ((entry (assq category *command-table*)))
+ (if entry
+ (set-cdr! entry (append (cdr entry) (list (list name))))
+ (set! *command-table*
+ (append *command-table*
+ (list (list category (list name)))))))))
+
+(define-syntax define-meta-command
+ (syntax-rules ()
+ ((_ ((name category) repl (expression0 ...) . datums) docstring b0 b1 ...)
+ (add-meta-command!
+ 'name
+ 'category
+ (lambda* (repl expression0 ... . datums)
+ docstring
+ b0 b1 ...)
+ (lambda (repl)
+ (define (handle-read-error form-name key args)
+ (pmatch args
+ ((,subr ,msg ,args . ,rest)
+ (format #t "Throw to key `~a' while reading ~@[argument `~A' of ~]command `~A':\n"
+ key form-name 'name)
+ (display-error #f (current-output-port) subr msg args rest))
+ (else
+ (format #t "Throw to key `~a' with args `~s' while reading ~@[ argument `~A' of ~]command `~A'.\n"
+ key args form-name 'name)))
+ (abort))
+ (% (let* ((expression0
+ (catch #t
+ (lambda ()
+ (repl-reader
+ ""
+ (lambda* (#:optional (port (current-input-port)))
+ ((language-reader (repl-language repl))
+ port (current-module)))))
+ (lambda (k . args)
+ (handle-read-error 'expression0 k args))))
+ ...)
+ (append
+ (list expression0 ...)
+ (catch #t
+ (lambda ()
+ (let ((port (open-input-string (read-line))))
+ (let lp ((out '()))
+ (let ((x (read port)))
+ (if (eof-object? x)
+ (reverse out)
+ (lp (cons x out)))))))
+ (lambda (k . args)
+ (handle-read-error #f k args)))))
+ (lambda (k) #f))))) ; the abort handler
+
+ ((_ ((name category) repl . datums) docstring b0 b1 ...)
+ (define-meta-command ((name category) repl () . datums)
+ docstring b0 b1 ...))
+
+ ((_ (name repl (expression0 ...) . datums) docstring b0 b1 ...)
+ (define-meta-command ((name #f) repl (expression0 ...) . datums)
+ docstring b0 b1 ...))
+
+ ((_ (name repl . datums) docstring b0 b1 ...)
+ (define-meta-command ((name #f) repl () . datums)
+ docstring b0 b1 ...))))
+
+
+
+;;;
+;;; Help commands
+;;;
+
+(define-meta-command (help repl . args)
+ "help [all | GROUP | [-c] COMMAND]
+Show help.
+
+With one argument, tries to look up the argument as a group name, giving
+help on that group if successful. Otherwise tries to look up the
+argument as a command, giving help on the command.
+
+If there is a command whose name is also a group name, use the ,help
+-c COMMAND form to give help on the command instead of the group.
+
+Without any argument, a list of help commands and command groups
+are displayed."
+ (pmatch args
+ (()
+ (display-group (lookup-group 'help))
+ (display "Command Groups:\n\n")
+ (display-summary "help all" #f "List all commands")
+ (for-each (lambda (g)
+ (let* ((name (symbol->string (group-name g)))
+ (usage (string-append "help " name))
+ (header (string-append "List " name " commands")))
+ (display-summary usage #f header)))
+ (cdr *command-table*))
+ (newline)
+ (display
+ "Type `,help -c COMMAND' to show documentation of a particular command.")
+ (newline))
+ ((all)
+ (for-each display-group *command-table*))
+ ((,group) (guard (lookup-group group))
+ (display-group (lookup-group group)))
+ ((,command) (guard (lookup-command command))
+ (display-command (lookup-command command)))
+ ((-c ,command) (guard (lookup-command command))
+ (display-command (lookup-command command)))
+ ((,command)
+ (format #t "Unknown command or group: ~A~%" command))
+ ((-c ,command)
+ (format #t "Unknown command: ~A~%" command))
+ (else
+ (format #t "Bad arguments: ~A~%" args))))
+
+(define-meta-command (show repl . args)
+ "show [TOPIC]
+Gives information about Guile.
+
+With one argument, tries to show a particular piece of information;
+
+currently supported topics are `warranty' (or `w'), `copying' (or `c'),
+and `version' (or `v').
+
+Without any argument, a list of topics is displayed."
+ (pmatch args
+ (()
+ (display-group (car *show-table*) #f)
+ (newline))
+ ((,topic) (guard (lookup-command topic *show-table*))
+ ((command-procedure (lookup-command topic *show-table*)) repl))
+ ((,command)
+ (format #t "Unknown topic: ~A~%" command))
+ (else
+ (format #t "Bad arguments: ~A~%" args))))
+
+;;; `warranty', `copying' and `version' are "hidden" meta-commands, only
+;;; accessible via `show'. They have an entry in *command-infos* but not
+;;; in *command-table*.
+
+(define-meta-command (warranty repl)
+ "show warranty
+Details on the lack of warranty."
+ (display *warranty*)
+ (newline))
+
+(define-meta-command (copying repl)
+ "show copying
+Show the LGPLv3."
+ (display *copying*)
+ (newline))
+
+(define-meta-command (version repl)
+ "show version
+Version information."
+ (display *version*)
+ (newline))
+
+(define-meta-command (apropos repl regexp)
+ "apropos REGEXP
+Find bindings/modules/packages."
+ (apropos (->string regexp)))
+
+(define-meta-command (describe repl (form))
+ "describe OBJ
+Show description/documentation."
+ (display
+ (object-documentation
+ (let ((input (repl-parse repl form)))
+ (if (symbol? input)
+ (module-ref (current-module) input)
+ (repl-eval repl input)))))
+ (newline))
+
+(define-meta-command (option repl . args)
+ "option [NAME] [EXP]
+List/show/set options."
+ (pmatch args
+ (()
+ (for-each (lambda (spec)
+ (format #t " ~A~24t~A\n" (car spec) (cadr spec)))
+ (repl-options repl)))
+ ((,name)
+ (display (repl-option-ref repl name))
+ (newline))
+ ((,name ,exp)
+ ;; Would be nice to evaluate in the current language, but the REPL
+ ;; option parser doesn't permit that, currently.
+ (repl-option-set! repl name (eval exp (current-module))))))
+
+(define-meta-command (quit repl)
+ "quit
+Quit this session."
+ (throw 'quit))
+
+
+;;;
+;;; Module commands
+;;;
+
+(define-meta-command (module repl . args)
+ "module [MODULE]
+Change modules / Show current module."
+ (pmatch args
+ (() (puts (module-name (current-module))))
+ ((,mod-name) (guard (list? mod-name))
+ (set-current-module (resolve-module mod-name)))
+ (,mod-name (set-current-module (resolve-module mod-name)))))
+
+(define-meta-command (import repl . args)
+ "import [MODULE ...]
+Import modules / List those imported."
+ (let ()
+ (define (use name)
+ (let ((mod (resolve-interface name)))
+ (if mod
+ (module-use! (current-module) mod)
+ (format #t "No such module: ~A~%" name))))
+ (if (null? args)
+ (for-each puts (map module-name (module-uses (current-module))))
+ (for-each use args))))
+
+(define-meta-command (load repl file)
+ "load FILE
+Load a file in the current module."
+ (load (->string file)))
+
+(define-meta-command (reload repl . args)
+ "reload [MODULE]
+Reload the given module, or the current module if none was given."
+ (pmatch args
+ (() (reload-module (current-module)))
+ ((,mod-name) (guard (list? mod-name))
+ (reload-module (resolve-module mod-name)))
+ (,mod-name (reload-module (resolve-module mod-name)))))
+
+(define-meta-command (binding repl)
+ "binding
+List current bindings."
+ (module-for-each (lambda (k v) (format #t "~23A ~A\n" k v))
+ (current-module)))
+
+(define-meta-command (in repl module command-or-expression . args)
+ "in MODULE COMMAND-OR-EXPRESSION
+Evaluate an expression or command in the context of module."
+ (let ((m (resolve-module module #:ensure #f)))
+ (if m
+ (pmatch command-or-expression
+ (('unquote ,command) (guard (lookup-command command))
+ (save-module-excursion
+ (lambda ()
+ (set-current-module m)
+ (apply (command-procedure (lookup-command command)) repl args))))
+ (,expression
+ (guard (null? args))
+ (repl-print repl (eval expression m)))
+ (else
+ (format #t "Invalid arguments to `in': expected a single expression or a command.\n")))
+ (format #t "No such module: ~s\n" module))))
+
+
+;;;
+;;; Language commands
+;;;
+
+(define-meta-command (language repl name)
+ "language LANGUAGE
+Change languages."
+ (let ((lang (lookup-language name))
+ (cur (repl-language repl)))
+ (format #t "Happy hacking with ~a! To switch back, type `,L ~a'.\n"
+ (language-title lang) (language-name cur))
+ (current-language lang)
+ (set! (repl-language repl) lang)))
+
+
+;;;
+;;; Compile commands
+;;;
+
+(define (load-image x)
+ (let ((thunk (load-thunk-from-memory x)))
+ (find-mapped-elf-image (program-code thunk))))
+
+(define-meta-command (compile repl (form))
+ "compile EXP
+Generate compiled code."
+ (let ((x (repl-compile repl (repl-parse repl form))))
+ (cond ((bytevector? x) (disassemble-image (load-image x)))
+ (else (repl-print repl x)))))
+
+(define-meta-command (compile-file repl file . opts)
+ "compile-file FILE
+Compile a file."
+ (compile-file (->string file) #:opts opts))
+
+(define-meta-command (expand repl (form))
+ "expand EXP
+Expand any macros in a form."
+ (let ((x (repl-expand repl (repl-parse repl form))))
+ (run-hook before-print-hook x)
+ (pp x)))
+
+(define-meta-command (optimize repl (form))
+ "optimize EXP
+Run the optimizer on a piece of code and print the result."
+ (let ((x (repl-optimize repl (repl-parse repl form))))
+ (run-hook before-print-hook x)
+ (pp x)))
+
+(define-meta-command (disassemble repl (form))
+ "disassemble EXP
+Disassemble a compiled procedure."
+ (let ((obj (repl-eval repl (repl-parse repl form))))
+ (cond
+ ((program? obj)
+ (disassemble-program obj))
+ ((bytevector? obj)
+ (disassemble-image (load-image obj)))
+ (else
+ (format #t
+ "Argument to ,disassemble not a procedure or a bytevector: ~a~%"
+ obj)))))
+
+(define-meta-command (disassemble-file repl file)
+ "disassemble-file FILE
+Disassemble a file."
+ (disassemble-file (->string file)))
+
+
+;;;
+;;; Profile commands
+;;;
+
+(define-meta-command (time repl (form))
+ "time EXP
+Time execution."
+ (let* ((gc-start (gc-run-time))
+ (real-start (get-internal-real-time))
+ (run-start (get-internal-run-time))
+ (result (repl-eval repl (repl-parse repl form)))
+ (run-end (get-internal-run-time))
+ (real-end (get-internal-real-time))
+ (gc-end (gc-run-time)))
+ (define (diff start end)
+ (/ (- end start) 1.0 internal-time-units-per-second))
+ (repl-print repl result)
+ (format #t ";; ~,6Fs real time, ~,6Fs run time. ~,6Fs spent in GC.\n"
+ (diff real-start real-end)
+ (diff run-start run-end)
+ (diff gc-start gc-end))
+ result))
+
+(define-meta-command (profile repl (form) . opts)
+ "profile EXP
+Profile execution."
+ ;; FIXME opts
+ (apply statprof
+ (repl-prepare-eval-thunk repl (repl-parse repl form))
+ opts))
+
+(define-meta-command (trace repl (form) . opts)
+ "trace EXP
+Trace execution."
+ ;; FIXME: doc options, or somehow deal with them better
+ (apply call-with-trace
+ (repl-prepare-eval-thunk repl (repl-parse repl form))
+ (cons* #:width (terminal-width) opts)))
+
+
+;;;
+;;; Debug commands
+;;;
+
+(define-syntax define-stack-command
+ (lambda (x)
+ (syntax-case x ()
+ ((_ (name repl . args) docstring body body* ...)
+ #`(define-meta-command (name repl . args)
+ docstring
+ (let ((debug (repl-debug repl)))
+ (if debug
+ (letrec-syntax
+ ((#,(datum->syntax #'repl 'frames)
+ (identifier-syntax (debug-frames debug)))
+ (#,(datum->syntax #'repl 'message)
+ (identifier-syntax (debug-error-message debug)))
+ (#,(datum->syntax #'repl 'index)
+ (identifier-syntax
+ (id (debug-index debug))
+ ((set! id exp) (set! (debug-index debug) exp))))
+ (#,(datum->syntax #'repl 'cur)
+ (identifier-syntax
+ (vector-ref #,(datum->syntax #'repl 'frames)
+ #,(datum->syntax #'repl 'index)))))
+ body body* ...)
+ (format #t "Nothing to debug.~%"))))))))
+
+(define-stack-command (backtrace repl #:optional count
+ #:key (width (terminal-width)) full?)
+ "backtrace [COUNT] [#:width W] [#:full? F]
+Print a backtrace.
+
+Print a backtrace of all stack frames, or innermost COUNT frames.
+If COUNT is negative, the last COUNT frames will be shown."
+ (print-frames frames
+ #:count count
+ #:width width
+ #:full? full?))
+
+(define-stack-command (up repl #:optional (count 1))
+ "up [COUNT]
+Select a calling stack frame.
+
+Select and print stack frames that called this one.
+An argument says how many frames up to go."
+ (cond
+ ((or (not (integer? count)) (<= count 0))
+ (format #t "Invalid argument to `up': expected a positive integer for COUNT.~%"))
+ ((>= (+ count index) (vector-length frames))
+ (cond
+ ((= index (1- (vector-length frames)))
+ (format #t "Already at outermost frame.\n"))
+ (else
+ (set! index (1- (vector-length frames)))
+ (print-frame cur #:index index))))
+ (else
+ (set! index (+ count index))
+ (print-frame cur #:index index))))
+
+(define-stack-command (down repl #:optional (count 1))
+ "down [COUNT]
+Select a called stack frame.
+
+Select and print stack frames called by this one.
+An argument says how many frames down to go."
+ (cond
+ ((or (not (integer? count)) (<= count 0))
+ (format #t "Invalid argument to `down': expected a positive integer for COUNT.~%"))
+ ((< (- index count) 0)
+ (cond
+ ((zero? index)
+ (format #t "Already at innermost frame.\n"))
+ (else
+ (set! index 0)
+ (print-frame cur #:index index))))
+ (else
+ (set! index (- index count))
+ (print-frame cur #:index index))))
+
+(define-stack-command (frame repl #:optional idx)
+ "frame [IDX]
+Show a frame.
+
+Show the selected frame.
+With an argument, select a frame by index, then show it."
+ (cond
+ (idx
+ (cond
+ ((or (not (integer? idx)) (< idx 0))
+ (format #t "Invalid argument to `frame': expected a non-negative integer for IDX.~%"))
+ ((< idx (vector-length frames))
+ (set! index idx)
+ (print-frame cur #:index index))
+ (else
+ (format #t "No such frame.~%"))))
+ (else (print-frame cur #:index index))))
+
+(define-stack-command (locals repl #:key (width (terminal-width)))
+ "locals
+Show local variables.
+
+Show locally-bound variables in the selected frame."
+ (print-locals cur #:width width))
+
+(define-stack-command (error-message repl)
+ "error-message
+Show error message.
+
+Display the message associated with the error that started the current
+debugging REPL."
+ (format #t "~a~%" (if (string? message) message "No error message")))
+
+(define-meta-command (break repl (form))
+ "break PROCEDURE
+Break on calls to PROCEDURE.
+
+Starts a recursive prompt when PROCEDURE is called."
+ (let ((proc (repl-eval repl (repl-parse repl form))))
+ (if (not (procedure? proc))
+ (error "Not a procedure: ~a" proc)
+ (let ((idx (add-trap-at-procedure-call! proc)))
+ (format #t "Trap ~a: ~a.~%" idx (trap-name idx))))))
+
+(define-meta-command (break-at-source repl file line)
+ "break-at-source FILE LINE
+Break when control reaches the given source location.
+
+Starts a recursive prompt when control reaches line LINE of file FILE.
+Note that the given source location must be inside a procedure."
+ (let ((file (if (symbol? file) (symbol->string file) file)))
+ (let ((idx (add-trap-at-source-location! file line)))
+ (format #t "Trap ~a: ~a.~%" idx (trap-name idx)))))
+
+(define (repl-pop-continuation-resumer repl msg)
+ ;; Capture the dynamic environment with this prompt thing. The result
+ ;; is a procedure that takes a frame and number of values returned.
+ (% (call-with-values
+ (lambda ()
+ (abort
+ (lambda (k)
+ ;; Call frame->stack-vector before reinstating the
+ ;; continuation, so that we catch the %stacks fluid at
+ ;; the time of capture.
+ (lambda (frame . values)
+ (k frame
+ (frame->stack-vector
+ (frame-previous frame))
+ values)))))
+ (lambda (from stack values)
+ (format #t "~a~%" msg)
+ (if (null? values)
+ (format #t "No return values.~%")
+ (begin
+ (format #t "Return values:~%")
+ (for-each (lambda (x) (repl-print repl x)) values)))
+ ((module-ref (resolve-interface '(system repl repl)) 'start-repl)
+ #:debug (make-debug stack 0 msg))))))
+
+(define-stack-command (finish repl)
+ "finish
+Run until the current frame finishes.
+
+Resume execution, breaking when the current frame finishes."
+ (let ((handler (repl-pop-continuation-resumer
+ repl (format #f "Return from ~a" cur))))
+ (add-ephemeral-trap-at-frame-finish! cur handler)
+ (throw 'quit)))
+
+(define (repl-next-resumer msg)
+ ;; Capture the dynamic environment with this prompt thing. The
+ ;; result is a procedure that takes a frame.
+ (% (let ((stack (abort
+ (lambda (k)
+ ;; Call frame->stack-vector before reinstating the
+ ;; continuation, so that we catch the %stacks fluid
+ ;; at the time of capture.
+ (lambda (frame)
+ (k (frame->stack-vector frame)))))))
+ (format #t "~a~%" msg)
+ ((module-ref (resolve-interface '(system repl repl)) 'start-repl)
+ #:debug (make-debug stack 0 msg)))))
+
+(define-stack-command (step repl)
+ "step
+Step until control reaches a different source location.
+
+Step until control reaches a different source location."
+ (let ((msg (format #f "Step into ~a" cur)))
+ (add-ephemeral-stepping-trap! cur (repl-next-resumer msg)
+ #:into? #t #:instruction? #f)
+ (throw 'quit)))
+
+(define-stack-command (step-instruction repl)
+ "step-instruction
+Step until control reaches a different instruction.
+
+Step until control reaches a different VM instruction."
+ (let ((msg (format #f "Step into ~a" cur)))
+ (add-ephemeral-stepping-trap! cur (repl-next-resumer msg)
+ #:into? #t #:instruction? #t)
+ (throw 'quit)))
+
+(define-stack-command (next repl)
+ "next
+Step until control reaches a different source location in the current frame.
+
+Step until control reaches a different source location in the current frame."
+ (let ((msg (format #f "Step into ~a" cur)))
+ (add-ephemeral-stepping-trap! cur (repl-next-resumer msg)
+ #:into? #f #:instruction? #f)
+ (throw 'quit)))
+
+(define-stack-command (next-instruction repl)
+ "next-instruction
+Step until control reaches a different instruction in the current frame.
+
+Step until control reaches a different VM instruction in the current frame."
+ (let ((msg (format #f "Step into ~a" cur)))
+ (add-ephemeral-stepping-trap! cur (repl-next-resumer msg)
+ #:into? #f #:instruction? #t)
+ (throw 'quit)))
+
+(define-meta-command (tracepoint repl (form))
+ "tracepoint PROCEDURE
+Add a tracepoint to PROCEDURE.
+
+A tracepoint will print out the procedure and its arguments, when it is
+called, and its return value(s) when it returns."
+ (let ((proc (repl-eval repl (repl-parse repl form))))
+ (if (not (procedure? proc))
+ (error "Not a procedure: ~a" proc)
+ (let ((idx (add-trace-at-procedure-call! proc)))
+ (format #t "Trap ~a: ~a.~%" idx (trap-name idx))))))
+
+(define-meta-command (traps repl)
+ "traps
+Show the set of currently attached traps.
+
+Show the set of currently attached traps (breakpoints and tracepoints)."
+ (let ((traps (list-traps)))
+ (if (null? traps)
+ (format #t "No traps set.~%")
+ (for-each (lambda (idx)
+ (format #t " ~a: ~a~a~%"
+ idx (trap-name idx)
+ (if (trap-enabled? idx) "" " (disabled)")))
+ traps))))
+
+(define-meta-command (delete repl idx)
+ "delete IDX
+Delete a trap.
+
+Delete a trap."
+ (if (not (integer? idx))
+ (error "expected a trap index (a non-negative integer)" idx)
+ (delete-trap! idx)))
+
+(define-meta-command (disable repl idx)
+ "disable IDX
+Disable a trap.
+
+Disable a trap."
+ (if (not (integer? idx))
+ (error "expected a trap index (a non-negative integer)" idx)
+ (disable-trap! idx)))
+
+(define-meta-command (enable repl idx)
+ "enable IDX
+Enable a trap.
+
+Enable a trap."
+ (if (not (integer? idx))
+ (error "expected a trap index (a non-negative integer)" idx)
+ (enable-trap! idx)))
+
+(define-stack-command (registers repl)
+ "registers
+Print registers.
+
+Print the registers of the current frame."
+ (print-registers cur))
+
+(define-meta-command (width repl #:optional x)
+ "width [X]
+Set debug output width.
+
+Set the number of screen columns in the output from `backtrace' and
+`locals'."
+ (terminal-width x)
+ (format #t "Set screen width to ~a columns.~%" (terminal-width)))
+
+
+
+;;;
+;;; Inspection commands
+;;;
+
+(define-meta-command (inspect repl (form))
+ "inspect EXP
+Inspect the result(s) of evaluating EXP."
+ (call-with-values (repl-prepare-eval-thunk repl (repl-parse repl form))
+ (lambda args
+ (for-each %inspect args))))
+
+(define-meta-command (pretty-print repl (form))
+ "pretty-print EXP
+Pretty-print the result(s) of evaluating EXP."
+ (call-with-values (repl-prepare-eval-thunk repl (repl-parse repl form))
+ (lambda args
+ (for-each
+ (lambda (x)
+ (run-hook before-print-hook x)
+ (pp x))
+ args))))
+
+
+;;;
+;;; System commands
+;;;
+
+(define-meta-command (gc repl)
+ "gc
+Garbage collection."
+ (gc))
+
+(define-meta-command (statistics repl)
+ "statistics
+Display statistics."
+ (let ((this-tms (times))
+ (this-gcs (gc-stats))
+ (last-tms (repl-tm-stats repl))
+ (last-gcs (repl-gc-stats repl)))
+ ;; GC times
+ (let ((this-times (assq-ref this-gcs 'gc-times))
+ (last-times (assq-ref last-gcs 'gc-times)))
+ (display-diff-stat "GC times:" #t this-times last-times "times")
+ (newline))
+ ;; Memory size
+ (let ((this-heap (assq-ref this-gcs 'heap-size))
+ (this-free (assq-ref this-gcs 'heap-free-size)))
+ (display-stat-title "Memory size:" "current" "limit")
+ (display-stat "heap" #f (- this-heap this-free) this-heap "bytes")
+ (newline))
+ ;; Cells collected
+ (let ((this-alloc (assq-ref this-gcs 'heap-total-allocated))
+ (last-alloc (assq-ref last-gcs 'heap-total-allocated)))
+ (display-stat-title "Bytes allocated:" "diff" "total")
+ (display-diff-stat "allocated" #f this-alloc last-alloc "bytes")
+ (newline))
+ ;; GC time taken
+ (let ((this-total (assq-ref this-gcs 'gc-time-taken))
+ (last-total (assq-ref last-gcs 'gc-time-taken)))
+ (display-stat-title "GC time taken:" "diff" "total")
+ (display-time-stat "total" this-total last-total)
+ (newline))
+ ;; Process time spent
+ (let ((this-utime (tms:utime this-tms))
+ (last-utime (tms:utime last-tms))
+ (this-stime (tms:stime this-tms))
+ (last-stime (tms:stime last-tms))
+ (this-cutime (tms:cutime this-tms))
+ (last-cutime (tms:cutime last-tms))
+ (this-cstime (tms:cstime this-tms))
+ (last-cstime (tms:cstime last-tms)))
+ (display-stat-title "Process time spent:" "diff" "total")
+ (display-time-stat "user" this-utime last-utime)
+ (display-time-stat "system" this-stime last-stime)
+ (display-time-stat "child user" this-cutime last-cutime)
+ (display-time-stat "child system" this-cstime last-cstime)
+ (newline))
+ ;; Save statistics
+ ;; Save statistics
+ (set! (repl-tm-stats repl) this-tms)
+ (set! (repl-gc-stats repl) this-gcs)))
+
+(define (display-stat title flag field1 field2 unit)
+ (let ((fmt (format #f "~~20~AA ~~10@A /~~10@A ~~A~~%" (if flag "" "@"))))
+ (format #t fmt title field1 field2 unit)))
+
+(define (display-stat-title title field1 field2)
+ (display-stat title #t field1 field2 ""))
+
+(define (display-diff-stat title flag this last unit)
+ (display-stat title flag (- this last) this unit))
+
+(define (display-time-stat title this last)
+ (define (conv num)
+ (format #f "~10,2F" (exact->inexact (/ num internal-time-units-per-second))))
+ (display-stat title #f (conv (- this last)) (conv this) "s"))
+
+(define (display-mips-stat title this-time this-clock last-time last-clock)
+ (define (mips time clock)
+ (if (= time 0) "----" (format #f "~10,2F" (/ clock time 1000000.0))))
+ (display-stat title #f
+ (mips (- this-time last-time) (- this-clock last-clock))
+ (mips this-time this-clock) "mips"))