Subversion Repositories openrisc_2011-10-31

#   Copyright 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

# 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 3 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, see .

# This is a regression test for the following bug, as of 2003-12-12:

#

# Set a breakpoint which will be hit many times.  Attach a complex set

# of commands to it, including a "continue" command.  Run the program,

# so that the breakpoint is hit, its commands get executed, and the

# program continues and hits the breakpoint again.  You will see

# messages like "warning: Invalid control type in command structure.",

# or maybe GDB will crash.

#

# When the breakpoint is hit, bpstat_stop_status copies the

# breakpoint's command tree to the bpstat.  bpstat_do_actions then

# calls execute_control_command to run the commands.  The 'continue'

# command invokes the following chain of calls:

#

#   continue_command

#     -> clear_proceed_status

#       -> bpstat_clear

#         -> free_command_lines

#            -> frees the commands we are currently running.

#

# When control does eventually return to execute_control_command, GDB

# continues to walk the tree of freed command nodes, resulting in the

# error messages and / or crashes.

#

# Since this bug depends on storage being reused between the time that

# we continue and the time that we fall back to bpstat_do_actions, the

# reproduction recipe is more delicate than I would like.  I welcome

# suggestions for improving this.

set testfile "freebpcmd"

set srcfile ${testfile}.c

set binfile ${objdir}/${subdir}/${testfile}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {

     untested freebpcmd.exp

     return -1

}

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

gdb_test "break ${srcfile}:[gdb_get_line_number "euphonium"]" ".*" \

    "set breakpoint"

# The goal of all this is to make sure that there's plenty of memory

# churn, and different amounts of it each time the inferior stops;

# this seems to make GDB crash more reliably.

set lines {{if (i%2) == 0}

           {echo "even "}

           {print i}

           {else}

           {echo "odd "}

           {print i}

           {end}

           {set variable $foo = 0}

           {set variable $j = 0}

           {while $j < i}

           {set variable $foo += $j}

           {set variable $j++}

           {end}

           {print $foo}

           {if i != 40}

           {c}

           {end}

           {end}}

send_gdb "commands\n"

for {set i 0} {$i < [llength $lines]} {incr i} {

    gdb_expect {

        -re ".*>" {

            send_gdb "[lindex $lines $i]\n"

        }

        -re "$gdb_prompt $" {

            set reason "got top-level prompt early"

            break

        }

        timeout {

            set reason "timeout"

            break

        }

    }

}

if {$i >= [llength $lines]} {

    pass "send breakpoint commands"

} else {

    fail "send breakpoint commands ($reason)"

}

gdb_run_cmd

set prev_timeout $timeout

set timeout 120

gdb_test_multiple "" "run program with breakpoint commands" {

    -re "warning: Invalid control type in command structure" {

        kfail "gdb/1489" "run program with breakpoint commands"

    }

    -re "$gdb_prompt $" {

        pass "run program with breakpoint commands"

    }

    eof {

        kfail "gdb/1489" "run program with breakpoint commands (GDB died)"

    }

}

set timeout $prev_timeout