gdb/testsuite/gdb.base/freebpcmd.exp

   1 #   Copyright 2003-2016 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16
  17 # This is a regression test for the following bug, as of 2003-12-12:
  18 #
  19 # Set a breakpoint which will be hit many times.  Attach a complex set
  20 # of commands to it, including a "continue" command.  Run the program,
  21 # so that the breakpoint is hit, its commands get executed, and the
  22 # program continues and hits the breakpoint again.  You will see
  23 # messages like "warning: Invalid control type in command structure.",
  24 # or maybe GDB will crash.
  25 #
  26 # When the breakpoint is hit, bpstat_stop_status copies the
  27 # breakpoint's command tree to the bpstat.  bpstat_do_actions then
  28 # calls execute_control_command to run the commands.  The 'continue'
  29 # command invokes the following chain of calls:
  30 #
  31 #   continue_command
  32 #     -> clear_proceed_status
  33 #       -> bpstat_clear
  34 #         -> free_command_lines
  35 #            -> frees the commands we are currently running.
  36 #
  37 # When control does eventually return to execute_control_command, GDB
  38 # continues to walk the tree of freed command nodes, resulting in the
  39 # error messages and / or crashes.
  40 #
  41 # Since this bug depends on storage being reused between the time that
  42 # we continue and the time that we fall back to bpstat_do_actions, the
  43 # reproduction recipe is more delicate than I would like.  I welcome
  44 # suggestions for improving this.
  45
  46
  47 standard_testfile
  48 if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
  49     return -1
  50 }
  51
  52 gdb_test "break ${srcfile}:[gdb_get_line_number "euphonium"]" ".*" \
  53     "set breakpoint"
  54
  55 # The goal of all this is to make sure that there's plenty of memory
  56 # churn, and different amounts of it each time the inferior stops;
  57 # this seems to make GDB crash more reliably.
  58 set lines {{if i<0 || i > 100}
  59            {echo Invalid i value\n}
  60            {else}
  61            {if (i%2) == 0}
  62            {echo "even "}
  63            {print i}
  64            {else}
  65            {echo "odd "}
  66            {print i}
  67            {end}
  68            {set variable $foo = 0}
  69            {set variable $j = 0}
  70            {while $j < i}
  71            {set variable $foo += $j}
  72            {set variable $j++}
  73            {end}
  74            {print $foo}
  75            {if i != 40}
  76            {c}
  77            {end}
  78            {end}
  79            {end}}
  80
  81 send_gdb "commands\n"
  82 for {set i 0} {$i < [llength $lines]} {incr i} {
  83     gdb_expect {
  84         -re ".*>" {
  85             send_gdb "[lindex $lines $i]\n"
  86         }
  87         -re "$gdb_prompt $" {
  88             set reason "got top-level prompt early"
  89             break
  90         }
  91         timeout {
  92             set reason "timeout"
  93             break
  94         }
  95     }
  96 }
  97 if {$i >= [llength $lines]} {
  98     pass "send breakpoint commands"
  99 } else {
 100     fail "send breakpoint commands ($reason)"
 101 }
 102
 103 gdb_run_cmd
 104
 105 with_timeout_factor 10 {
 106     gdb_test_multiple "" "run program with breakpoint commands" {
 107         -re "warning: Invalid control type in command structure" {
 108             kfail "gdb/1489" "run program with breakpoint commands"
 109         }
 110         -re "Invalid i value\r\n$gdb_prompt $" {
 111             xfail "run program with breakpoint commands (i value not readable)"
 112         }
 113         -re "$gdb_prompt $" {
 114             pass "run program with breakpoint commands"
 115         }
 116         eof {
 117             kfail "gdb/1489" "run program with breakpoint commands (GDB died)"
 118         }
 119     }
 120 }