1#   Copyright 2003, 2007, 2008, 2009, 2010, 2011
2#   Free Software Foundation, Inc.
3
4# This program is free software; you can redistribute it and/or modify
5# it under the terms of the GNU General Public License as published by
6# the Free Software Foundation; either version 3 of the License, or
7# (at your option) any later version.
8#
9# This program is distributed in the hope that it will be useful,
10# but WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12# GNU General Public License for more details.
13#
14# You should have received a copy of the GNU General Public License
15# along with this program.  If not, see <http://www.gnu.org/licenses/>.
16
17
18# This is a regression test for the following bug, as of 2003-12-12:
19#
20# Set a breakpoint which will be hit many times.  Attach a complex set
21# of commands to it, including a "continue" command.  Run the program,
22# so that the breakpoint is hit, its commands get executed, and the
23# program continues and hits the breakpoint again.  You will see
24# messages like "warning: Invalid control type in command structure.",
25# or maybe GDB will crash.
26#
27# When the breakpoint is hit, bpstat_stop_status copies the
28# breakpoint's command tree to the bpstat.  bpstat_do_actions then
29# calls execute_control_command to run the commands.  The 'continue'
30# command invokes the following chain of calls:
31#
32#   continue_command
33#     -> clear_proceed_status
34#       -> bpstat_clear
35#         -> free_command_lines
36#            -> frees the commands we are currently running.
37#
38# When control does eventually return to execute_control_command, GDB
39# continues to walk the tree of freed command nodes, resulting in the
40# error messages and / or crashes.
41#
42# Since this bug depends on storage being reused between the time that
43# we continue and the time that we fall back to bpstat_do_actions, the
44# reproduction recipe is more delicate than I would like.  I welcome
45# suggestions for improving this.
46
47
48set testfile "freebpcmd"
49set srcfile ${testfile}.c
50set binfile ${objdir}/${subdir}/${testfile}
51
52if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
53     untested freebpcmd.exp
54     return -1
55}
56
57gdb_exit
58gdb_start
59gdb_reinitialize_dir $srcdir/$subdir
60gdb_load ${binfile}
61
62gdb_test "break ${srcfile}:[gdb_get_line_number "euphonium"]" ".*" \
63    "set breakpoint"
64
65# The goal of all this is to make sure that there's plenty of memory
66# churn, and different amounts of it each time the inferior stops;
67# this seems to make GDB crash more reliably.
68set lines {{if (i%2) == 0}
69           {echo "even "}
70           {print i}
71           {else}
72           {echo "odd "}
73           {print i}
74           {end}
75           {set variable $foo = 0}
76           {set variable $j = 0}
77           {while $j < i}
78           {set variable $foo += $j}
79           {set variable $j++}
80           {end}
81           {print $foo}
82           {if i != 40}
83           {c}
84           {end}
85           {end}}
86
87send_gdb "commands\n"
88for {set i 0} {$i < [llength $lines]} {incr i} {
89    gdb_expect {
90        -re ".*>" {
91            send_gdb "[lindex $lines $i]\n"
92        }
93        -re "$gdb_prompt $" {
94            set reason "got top-level prompt early"
95            break
96        }
97        timeout {
98            set reason "timeout"
99            break
100        }
101    }
102}
103if {$i >= [llength $lines]} {
104    pass "send breakpoint commands"
105} else {
106    fail "send breakpoint commands ($reason)"
107}
108
109gdb_run_cmd
110
111set prev_timeout $timeout
112set timeout 120
113
114gdb_test_multiple "" "run program with breakpoint commands" {
115    -re "warning: Invalid control type in command structure" {
116        kfail "gdb/1489" "run program with breakpoint commands"
117    }
118    -re "$gdb_prompt $" {
119        pass "run program with breakpoint commands"
120    }
121    eof {
122        kfail "gdb/1489" "run program with breakpoint commands (GDB died)"
123    }
124}
125
126set timeout $prev_timeout
127