bash debugger Code

187 lines (163 with data), 5.8 kB

# -*- shell-script -*-
# This program needs to be SOURCE'd and is not called as an executable
# Note: bashdb-trace is created from bashdb-trace.in
#
#   Copyright (C) 2006, 2007, 2008, 2010, 2012, 2019
#   Rocky Bernstein <rocky@gnu.org>
#
#   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, 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; see the file COPYING.  If not, write to
#   the Free Software Foundation, 59 Temple Place, Suite 330, Boston,
#   MA 02111 USA.
#

# The alternate way to invoke debugger, "bash --debugger", has some
# advantages: it sets $0 correctly and doesn't show this script in
# the call trace. However the bash has been a bit inflexible and
# quirky so sadly this script seems to be needed more than it would
# normally.
typeset _Dbg_trace_old_set_opts
_Dbg_trace_old_set_opts=$-
set +u
if [[ ! $BASH_VERSION =~ ^5. ]] ; then
    echo "This debugger needs bash version 5 or greater. You have ${BASH_VERSION} " >&2
    exit 1
fi


# Name we refer to ourselves by
typeset _Dbg_debugger_name='@PACKAGE@'

# The shell we are configured to run under.
typeset _Dbg_shell='@SH_PROG@'

# The short shell name. Helps keep code common in bash, zsh, and ksh debuggers.
typeset _Dbg_shell_name=${_Dbg_shell##*/}

# Original $0. Note we can't set this in an include.
typeset _Dbg_orig_0=$0

# Equivalent to basename $0; the short program name
typeset _Dbg_pname=${0##*/}

# Show basename only in location listing. This is needed in regression tests
typeset -i _Dbg_set_basename=${BASHDB_BASENAME_ONLY:-0}

typeset _Dbg_main=dbg-main.sh
typeset prefix=@prefix@  # cygwin gets PKGDATADIR wrong
typeset _Dbg_libdir=@PKGDATADIR@
typeset _Dbg_bindir=$(dirname $0)
typeset _Dbg_tmpdir=/tmp

# What to set for location of helper routines?
if [[ ! -e $_Dbg_libdir/$_Dbg_main ]] ; then
    # Use bindir/../share as fallback
    _Dbg_libdir=
    if [[ -d $_Dbg_bindir/../share/bashdb ]] ; then
      _Dbg_libdir=$_Dbg_bindir/../share/bashdb
    fi
fi

# Parse just the library option
typeset -ax _Dbg_script_args=("$@")
typeset -i i
for ((i=0; $i<${#_Dbg_script_args[@]}-1; i++)) ; do
    typeset arg=${_Dbg_script_args[$i]}
    if [[ $arg == '-L' || $arg == '--library' ]] ; then
	((i++))
	_Dbg_libdir="${_Dbg_script_args[$i]}"
	break
    fi
done
if [[ ! -d $_Dbg_libdir ]] || [[ ! -r $_Dbg_libdir ]] ; then
  if [[ ! -d $_Dbg_libdir ]] ; then
      echo "${_Dbg_pname}: '${_Dbg_libdir}' is not a directory." 1>&2
  elif [[ ! -r $_Dbg_libdir ]] ; then
      echo "${_Dbg_pname}: Can't read debugger library directory '${_Dbg_libdir}'."
  fi
  echo "${_Dbg_pname}: Perhaps @PACKAGE@ is installed wrong (if its installed)." >&2
  echo "${_Dbg_pname}: Try running @PACKAGE@ using -L (with a different directory)." >&2
  echo "${_Dbg_pname}: Run @PACKAGE@ --help for a list and explanation of options." >&2
  exit 1
fi

[[ -r $_Dbg_libdir/dbg-main.sh ]] || {
  echo "${_Dbg_pname}: cannot read debugger file $_Dbg_libdir/dbg-main.sh" >&2
  echo "${_Dbg_pname}: Perhaps bashdb is installed incorrectly." >&2
  exit 1
}

. $_Dbg_libdir/dbg-main.sh

if [[ ! -d $_Dbg_tmpdir ]] && [[ ! -w $_Dbg_tmpdir ]] ; then
  echo "${_Dbg_pname}: cannot write to temp directory $_Dbg_tmpdir." >&2
  echo "${_Dbg_pname}: Use -T try directory location." >&2
  exit 1
fi

# Note that this is called via bashdb rather than "bash --debugger"
_Dbg_script=1

_Dbg_set_trace_init=1

# Older alias for _Dbg_debugger()
_Dbg_set_trace() {
  set -o functrace
  while (( $# > 0 )) ; do
    eval $1
    shift
  done

  if [[ -z $_Dbg_set_trace_init ]] ; then
      _Dbg_set_trace_init=1
      _Dbg_step_ignore=${step_ignore:-0}
      _Dbg_write_journal "_Dbg_step_ignore=0"
  else
      _Dbg_step_ignore=${1:-2}
  fi
  trap '_Dbg_debug_trap_handler 0 "$BASH_COMMAND" "$@"' DEBUG
}

# Turn on line tracing. Sort of a nicer replacement for
# set -x
#
# Example:
#   source /usr/local/share/bashdb/bashdb-trace -q
#   ...
#   _Dbg_linetrace_on
#   for i in `seq 10` ; do
#     echo $i
#   done
#   _Dbg_linetrace_off
#   _Dbg_QUIT_ON_QUIT=1   # Set this to make sure not to stay in debugger
#                         # after program terminates. Might also do earlier.

_Dbg_linetrace_on() {
  set -o functrace
  _Dbg_set_linetrace=1
  _Dbg_step_ignore=-1
  trap '_Dbg_debug_trap_handler 0 "$BASH_COMMAND" "$@"' DEBUG
}

# Turn off line tracing. Sort of a nicer replacement for
# set +x.
#
# See _Dbg_linetrace_on() for an example.
_Dbg_linetrace_off() {
  _Dbg_set_linetrace=0
}

# Use the debugger signal handler when getting the signal specified.
# additional arguments can be the values for "print" "stack" and "stop"
# Examples:
#    _Dbg_handler INT print stack nostop      # this is the default
#    _Dbg_handler INT                         # same thing
#    _Dbg_hander                              # same thing
#    _Dbg_handler HUP print stop              # stop in debugger when getting
#                                             # a HUP signal
_Dbg_handler() {
   local signame=${1:INT}
   shift
   local -a rest=$*
   if [[ -z $rest ]]; then
       rest=("print" "stack" "stop")
   fi
  _Dbg_init_trap $signame
  for attr in ${rest[@]}; do
      _Dbg_do_handle $signame $attr
  done
  _Dbg_set_linetrace=0
  _Dbg_step_ignore=-1
}

_Dbg_init_default_traps
set -${_Dbg_trace_old_set_opts}
unset _Dbg_trace_old_set_opts
# end of bashdb-trace