diff options
Diffstat (limited to 'examples/obashdb/bashdb')
| -rwxr-xr-x[-rw-r--r--] | examples/obashdb/bashdb | 596 |
1 files changed, 572 insertions, 24 deletions
diff --git a/examples/obashdb/bashdb b/examples/obashdb/bashdb index 97d287d..560cb7c 100644..100755 --- a/examples/obashdb/bashdb +++ b/examples/obashdb/bashdb @@ -1,33 +1,581 @@ -# kshdb - Korn Shell Debugger main file -# adapted from 'Learning the Korn Shell' by Bill Rosenblatt (O'Reilly) -# by Cigy Cyriac (cigy@felix.tulblr.unisys.com) -# Main driver: constructs full script (with preamble) and runs it +#! /bin/bash +# bashdb - Bash shell debugger +# +# Adapted from an idea in O'Reilly's `Learning the Korn Shell' +# Copyright (C) 1993-1994 O'Reilly and Associates, Inc. +# Copyright (C) 1998, 1999, 2001 Gary V. Vaughan <gvv@techie.com>> +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program 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 +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +# +# As a special exception to the GNU General Public License, if you +# distribute this file as part of a program that contains a +# configuration script generated by Autoconf, you may include it under +# the same distribution terms that you use for the rest of that program. -echo 'Bourne-Again Shell Debugger version 0.1' +# NOTE: +# +# This program requires bash 2.x. +# If bash 2.x is installed as "bash2", you can invoke bashdb like this: +# +# DEBUG_SHELL=/bin/bash2 /bin/bash2 bashdb script.sh -_pname=${0##*/} +# TODO: +# +# break [regexp] +# cond [break] [condition] +# tbreak [regexp|+lines] +# restart +# Variable watchpoints +# Instrument `source' and `.' files in $_potbelliedpig +# be cleverer about lines we allow breakpoints to be set on +# break [function_name] -[ $# -eq 0 ] && { - echo "${_pname}: usage: ${_pname} <script_file>" - exit 1 -} +echo 'Bash Debugger version 1.2.4' + +export _dbname=${0##*/} + +if test $# -lt 1; then + echo "$_dbname: Usage: $_dbname filename" >&2 + exit 1 +fi _guineapig=$1 -[ -r $_guineapig ] || { - echo "${_pname}: cannot read $_guineapig." >&2 - exit 1 -} +if test ! -r $1; then + echo "$_dbname: Cannot read file '$_guineapig'." >&2 + exit 1 +fi + shift -_tmpdir=/tmp -_libdir=. -_dbgfile=$_tmpdir/bashdb$$ #temp file for script being debugged +__debug=${TMPDIR-/tmp}/bashdb.$$ +sed -e '/^# bashdb - Bash shell debugger/,/^# -- DO NOT DELETE THIS LINE -- /d' "$0" > $__debug +cat $_guineapig >> $__debug +exec ${DEBUG_SHELL-bash} $__debug $_guineapig "$@" -cat $_libdir/bashdb.pre $_guineapig > $_dbgfile -if [ -f "$BASH" ]; then - exec $BASH $_dbgfile $_guineapig $_tmpdir $_libdir "$@" -else - exec bash $_dbgfile $_guineapig $_tmpdir $_libdir "$@" -fi -# end of bashdb +exit 1 + +# -- DO NOT DELETE THIS LINE -- The program depends on it + +#bashdb preamble +# $1 name of the original guinea pig script + +__debug=$0 +_guineapig=$1 +__steptrap_calls=0 + +shift + +shopt -s extglob # turn on extglob so we can parse the debugger funcs + +function _steptrap +{ + local i=0 + + _curline=$1 + + if (( ++__steptrap_calls > 1 && $_curline == 1 )); then + return + fi + + if [ -n "$_disps" ]; then + while (( $i < ${#_disps[@]} )) + do + if [ -n "${_disps[$i]}" ]; then + _msg "${_disps[$i]}: \c" + eval _msg ${_disps[$i]} + fi + let i=$i+1 + done + fi + + if (( $_trace )); then + _showline $_curline + fi + + if (( $_steps >= 0 )); then + let _steps="$_steps - 1" + fi + + if _at_linenumbp ; then + _msg "Reached breakpoint at line $_curline" + _showline $_curline + _cmdloop + elif [ -n "$_brcond" ] && eval $_brcond; then + _msg "Break condition $_brcond true at line $_curline" + _showline $_curline + _cmdloop + elif (( $_steps == 0 )); then + # Assuming a real script will have the "#! /bin/sh" at line 1, + # assume that when $_curline == 1 we are inside backticks. + if (( ! $_trace )); then + _msg "Stopped at line $_curline" + _showline $_curline + fi + _cmdloop + fi +} + +function _setbp +{ + local i f line _x + + if [ -z "$1" ]; then + _listbp + return + fi + + eval "$_seteglob" + + if [[ $1 == *(\+)[1-9]*([0-9]) ]]; then + case $1 in + +*) + # normalize argument, then double it (+2 -> +2 + 2 = 4) + _x=${1##*([!1-9])} # cut off non-numeric prefix + _x=${x%%*([!0-9])} # cut off non-numeric suffix + f=$(( $1 + $_x )) + ;; + *) + f=$(( $1 )) + ;; + esac + + # find the next valid line + line="${_lines[$f]}" + while _invalidbreakp $f + do + (( f++ )) + line="${_lines[$f]}" + done + + if (( $f != $1 )) + then + _msg "Line $1 is not a valid breakpoint" + fi + + if [ -n "${_lines[$f]}" ]; then + _linebp[$1]=$1; + _msg "Breakpoint set at line $f" + else + _msg "Breakpoints can only be set on executable lines" + fi + else + _msg "Please specify a numeric line number" + fi + + eval "$_resteglob" +} + +function _listbp +{ + local i + + if [ -n "$_linebp" ]; then + _msg "Breakpoints:" + for i in ${_linebp[*]}; do + _showline $i + done + else + _msg "No breakpoints have been set" + fi +} + +function _clearbp +{ + local i + + if [ -z "$1" ]; then + read -e -p "Delete all breakpoints? " + case $REPLY in + [yY]*) + unset _linebp[*] + _msg "All breakpoints have been cleared" + ;; + esac + return 0 + fi + + eval "$_seteglob" + + if [[ $1 == [1-9]*([0-9]) ]]; then + unset _linebp[$1] + _msg "Breakpoint cleared at line $1" + else + _msg "Please specify a numeric line number" + fi + + eval "$_resteglob" +} + +function _setbc +{ + if (( $# > 0 )); then + _brcond=$@ + _msg "Break when true: $_brcond" + else + _brcond= + _msg "Break condition cleared" + fi +} + +function _setdisp +{ + if [ -z "$1" ]; then + _listdisp + else + _disps[${#_disps[@]}]="$1" + if (( ${#_disps[@]} < 10 )) + then + _msg " ${#_disps[@]}: $1" + else + _msg "${#_disps[@]}: $1" + fi + fi +} + +function _listdisp +{ + local i=0 j + + if [ -n "$_disps" ]; then + while (( $i < ${#_disps[@]} )) + do + let j=$i+1 + if (( ${#_disps[@]} < 10 )) + then + _msg " $j: ${_disps[$i]}" + else + _msg "$j: ${_disps[$i]}" + fi + let i=$j + done + else + _msg "No displays have been set" + fi +} + +function _cleardisp +{ + if (( $# < 1 )) ; then + read -e -p "Delete all display expressions? " + case $REPLY in + [Yy]*) + unset _disps[*] + _msg "All breakpoints have been cleared" + ;; + esac + return 0 + fi + + eval "$_seteglob" + + if [[ $1 == [1-9]*([0-9]) ]]; then + unset _disps[$1] + _msg "Display $i has been cleared" + else + _listdisp + _msg "Please specify a numeric display number" + fi + + eval "$_resteglob" +} + +# usage _ftrace -u funcname [funcname...] +function _ftrace +{ + local _opt=-t _tmsg="enabled" _func + if [[ $1 == -u ]]; then + _opt=+t + _tmsg="disabled" + shift + fi + for _func; do + declare -f $_opt $_func + _msg "Tracing $_tmsg for function $_func" + done +} + +function _cmdloop +{ + local cmd args + + while read -e -p "bashdb> " cmd args; do + test -n "$cmd" && history -s "$cmd $args" # save on history list + test -n "$cmd" || { set $_lastcmd; cmd=$1; shift; args=$*; } + if [ -n "$cmd" ] + then + case $cmd in + b|br|bre|brea|break) + _setbp $args + _lastcmd="break $args" + ;; + co|con) + _msg "ambiguous command: '$cmd', condition, continue?" + ;; + cond|condi|condit|conditi|conditio|condition) + _setbc $args + _lastcmd="condition $args" + ;; + c|cont|conti|contin|continu|continue) + _lastcmd="continue" + return + ;; + d) + _msg "ambiguous command: '$cmd', delete, display?" + ;; + de|del|dele|delet|delete) + _clearbp $args + _lastcmd="delete $args" + ;; + di|dis|disp|displ|displa|display) + _setdisp $args + _lastcmd="display $args" + ;; + f|ft|ftr|ftra|ftrace) + _ftrace $args + _lastcmd="ftrace $args" + ;; + \?|h|he|hel|help) + _menu + _lastcmd="help" + ;; + l|li|lis|list) + _displayscript $args + # _lastcmd is set in the _displayscript function + ;; + p|pr|pri|prin|print) + _examine $args + _lastcmd="print $args" + ;; + q|qu|qui|quit) + exit + ;; + s|st|ste|step|n|ne|nex|next) + let _steps=${args:-1} + _lastcmd="next $args" + return + ;; + t|tr|tra|trac|trace) + _xtrace + ;; + u|un|und|undi|undis|undisp|undispl|undispla|undisplay) + _cleardisp $args + _lastcmd="undisplay $args" + ;; + !*) + eval ${cmd#!} $args + _lastcmd="$cmd $args" + ;; + *) + _msg "Invalid command: '$cmd'" + ;; + esac + fi + done +} + +function _at_linenumbp +{ + [[ -n ${_linebp[$_curline]} ]] +} + +function _invalidbreakp +{ + local line=${_lines[$1]} + + # XXX - should use shell patterns + if test -z "$line" \ + || expr "$line" : '[ \t]*#.*' > /dev/null \ + || expr "$line" : '[ \t]*;;[ \t]*$' > /dev/null \ + || expr "$line" : '[ \t]*[^)]*)[ \t]*$' > /dev/null \ + || expr "$line" : '[ \t]*;;[ \t]*#.**$' > /dev/null \ + || expr "$line" : '[ \t]*[^)]*)[ \t]*;;[ \t]*$' > /dev/null \ + || expr "$line" : '[ \t]*[^)]*)[ \t]*;;*[ \t]*#.*$' > /dev/null + then + return 0 + fi + + return 1 +} + +function _examine +{ + if [ -n "$*" ]; then + _msg "$args: \c" + eval _msg $args + else + _msg "Nothing to print" + fi +} + +function _displayscript +{ + local i j start end bp cl + + if (( $# == 1 )); then # list 5 lines on either side of $1 + if [ $1 = "%" ]; then + let start=1 + let end=${#_lines[@]} + else + let start=$1-5 + let end=$1+5 + fi + elif (( $# > 1 )); then # list between start and end + if [ $1 = "^" ]; then + let start=1 + else + let start=$1 + fi + + if [ $2 = "\$" ]; then + let end=${#_lines[@]} + else + let end=$2 + fi + else # list 5 lines on either side of current line + let start=$_curline-5 + let end=$_curline+5 + fi + + # normalize start and end + if (( $start < 1 )); then + start=1 + fi + if (( $end > ${#_lines[@]} )); then + end=${#_lines[@]} + fi + + cl=$(( $end - $start )) + if (( $cl > ${LINES-24} )); then + pager=${PAGER-more} + else + pager=cat + fi + + i=$start + ( while (( $i <= $end )); do + _showline $i + let i=$i+1 + done ) 2>&1 | $pager + + # calculate the next block of lines + start=$(( $end + 1 )) + end=$(( $start + 11 )) + if (( $end > ${#_lines[@]} )) + then + end=${#_lines[@]} + fi + + _lastcmd="list $start $end" +} + +function _xtrace +{ + let _trace="! $_trace" + if (( $_trace )); then + _msg "Execution trace on" + else + _msg "Execution trace off" + fi +} + +function _msg +{ + echo -e "$@" >&2 +} + +function _showline +{ + local i=0 bp=' ' line=$1 cl=' ' + + if [[ -n ${_linebp[$line]} ]]; then + bp='*' + fi + + if (( $_curline == $line )); then + cl=">" + fi + + if (( $line < 100 )); then + _msg "${_guineapig/*\//}:$line $bp $cl${_lines[$line]}" + elif (( $line < 10 )); then + _msg "${_guineapig/*\//}:$line $bp $cl${_lines[$line]}" + elif (( $line > 0 )); then + _msg "${_guineapig/*\//}:$line $bp $cl${_lines[$line]}" + fi +} + +function _cleanup +{ + rm -f $__debug $_potbelliedpig 2> /dev/null +} + +function _menu +{ + _msg 'bashdb commands: + break N set breakpoint at line N + break list breakpoints & break condition + condition foo set break condition to foo + condition clear break condition + delete N clear breakpoint at line N + delete clear all breakpoints + display EXP evaluate and display EXP for each debug step + display show a list of display expressions + undisplay N remove display expression N + list N M display all lines of script between N and M + list N display 5 lines of script either side of line N + list display 5 lines if script either side of current line + continue continue execution upto next breakpoint + next [N] execute [N] statements (default 1) + print expr prints the value of an expression + trace toggle execution trace on/off + ftrace [-u] func make the debugger step into function FUNC + (-u turns off tracing FUNC) + help print this menu + ! string passes string to a shell + quit quit' +} + +shopt -u extglob + +HISTFILE=~/.bashdb_history +set -o history +set +H + +# strings to save and restore the setting of `extglob' in debugger functions +# that need it +_seteglob='local __eopt=-u ; shopt -q extglob && __eopt=-s ; shopt -s extglob' +_resteglob='shopt $__eopt extglob' + +_linebp=() +let _trace=0 +let _i=1 + +# Be careful about quoted newlines +_potbelliedpig=${TMPDIR-/tmp}/${_guineapig/*\//}.$$ +sed 's,\\$,\\\\,' $_guineapig > $_potbelliedpig + +_msg "Reading source from file: $_guineapig" +while read; do + _lines[$_i]=$REPLY + let _i=$_i+1 +done < $_potbelliedpig + +trap _cleanup EXIT +# Assuming a real script will have the "#! /bin/sh" at line 1, +# don't stop at line 1 on the first run +let _steps=1 +LINENO=-1 +trap '_steptrap $LINENO' DEBUG |