1#   Copyright 2003-2013 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
47set testfile "freebpcmd"
48set srcfile ${testfile}.c
49set binfile ${objdir}/${subdir}/${testfile}
50
51if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
52     untested freebpcmd.exp
53     return -1
54}
55
56gdb_exit
57gdb_start
58gdb_reinitialize_dir $srcdir/$subdir
59gdb_load ${binfile}
60
61gdb_test "break ${srcfile}:[gdb_get_line_number "euphonium"]" ".*" \
62    "set breakpoint"
63
64# The goal of all this is to make sure that there's plenty of memory
65# churn, and different amounts of it each time the inferior stops;
66# this seems to make GDB crash more reliably.
67set lines {{if i<0 || i > 100}
68	   {echo Invalid i value\n}
69	   {else}
70	   {if (i%2) == 0}
71           {echo "even "}
72           {print i}
73           {else}
74           {echo "odd "}
75           {print i}
76           {end}
77           {set variable $foo = 0}
78           {set variable $j = 0}
79           {while $j < i}
80           {set variable $foo += $j}
81           {set variable $j++}
82           {end}
83           {print $foo}
84           {if i != 40}
85           {c}
86           {end}
87	   {end}
88           {end}}
89
90send_gdb "commands\n"
91for {set i 0} {$i < [llength $lines]} {incr i} {
92    gdb_expect {
93        -re ".*>" {
94            send_gdb "[lindex $lines $i]\n"
95        }
96        -re "$gdb_prompt $" {
97            set reason "got top-level prompt early"
98            break
99        }
100        timeout {
101            set reason "timeout"
102            break
103        }
104    }
105}
106if {$i >= [llength $lines]} {
107    pass "send breakpoint commands"
108} else {
109    fail "send breakpoint commands ($reason)"
110}
111
112gdb_run_cmd
113
114set prev_timeout $timeout
115set timeout 120
116
117gdb_test_multiple "" "run program with breakpoint commands" {
118    -re "warning: Invalid control type in command structure" {
119        kfail "gdb/1489" "run program with breakpoint commands"
120    }
121    -re "Invalid i value\r\n$gdb_prompt $" {
122	xfail "run program with breakpoint commands (i value not readable)"
123    }
124    -re "$gdb_prompt $" {
125        pass "run program with breakpoint commands"
126    }
127    eof {
128        kfail "gdb/1489" "run program with breakpoint commands (GDB died)"
129    }
130}
131
132set timeout $prev_timeout
133