1#   Copyright 2003, 2007 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
46set prms_id 0
47set bug_id 0
48
49set testfile "freebpcmd"
50set srcfile ${testfile}.c
51set srcfile1 ${testfile}1.c
52set binfile ${objdir}/${subdir}/${testfile}
53
54if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
55     untested freebpcmd.exp
56     return -1
57}
58
59gdb_exit
60gdb_start
61gdb_reinitialize_dir $srcdir/$subdir
62gdb_load ${binfile}
63
64gdb_test "break [gdb_get_line_number "euphonium"]" "" "set breakpoint"
65
66# The goal of all this is to make sure that there's plenty of memory
67# churn, and different amounts of it each time the inferior stops;
68# this seems to make GDB crash more reliably.
69set lines {{if (i%2) == 0}
70           {echo "even "}
71           {print i}
72           {else}
73           {echo "odd "}
74           {print i}
75           {end}
76           {set variable $foo = 0}
77           {set variable $j = 0}
78           {while $j < i}
79           {set variable $foo += $j}
80           {set variable $j++}
81           {end}
82           {print $foo}
83           {if i != 40}
84           {c}
85           {end}
86           {end}}
87
88send_gdb "commands\n"
89for {set i 0} {$i < [llength $lines]} {incr i} {
90    gdb_expect {
91        -re ".*>" {
92            send_gdb "[lindex $lines $i]\n"
93        }
94        -re "$gdb_prompt $" {
95            set reason "got top-level prompt early"
96            break
97        }
98        timeout {
99            set reason "timeout"
100            break
101        }
102    }
103}
104if {$i >= [llength $lines]} {
105    pass "send breakpoint commands"
106} else {
107    fail "send breakpoint commands ($reason)"
108}
109
110gdb_run_cmd
111
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