1 # Copyright 1992-2013 Free Software Foundation, Inc.
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.
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.
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/>.
16 # This file was written by Jeff Law. (law@cs.utah.edu)
19 set testfile "recurse"
20 set srcfile ${testfile}.c
21 set binfile ${objdir}/${subdir}/${testfile}
22 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
27 # Start with a fresh gdb.
31 gdb_reinitialize_dir $srcdir/$subdir
34 proc recurse_tests {} {
36 # Disable hardware watchpoints if necessary.
37 if [target_info exists gdb,no_hardware_watchpoints] {
38 gdb_test_no_output "set can-use-hw-watchpoints 0" ""
41 if [runto recurse] then {
42 # First we need to step over the assignment of b, so it has a known
44 gdb_test "next" "if \\(a == 1\\)" "next over b = 0 in first instance"
45 gdb_test "watch b" ".*\[Ww\]atchpoint \[0-9]*: b" \
46 "set first instance watchpoint"
48 # Continue until initial set of b.
49 if [gdb_test "continue" \
50 "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 0.*New value = 10.*" \
51 "continue to first instance watchpoint, first time"] then {
55 # Continue inward for a few iterations
56 gdb_test "continue" "Breakpoint.* recurse \\(a=9\\).*" \
57 "continue to recurse (a = 9)"
58 gdb_test "continue" "Breakpoint.* recurse \\(a=8\\).*" \
59 "continue to recurse (a = 8)"
60 gdb_test "continue" "Breakpoint.* recurse \\(a=7\\).*" \
61 "continue to recurse (a = 7)"
62 gdb_test "continue" "Breakpoint.* recurse \\(a=6\\).*" \
63 "continue to recurse (a = 6)"
64 gdb_test "continue" "Breakpoint.* recurse \\(a=5\\).*" \
65 "continue to recurse (a = 5)"
67 # Put a watchpoint on another instance of b
68 # First we need to step over the assignment of b, so it has a known
70 gdb_test "next" "if \\(a == 1\\)" "next over b = 0 in second instance"
71 gdb_test "watch b" ".*\[Ww\]atchpoint \[0-9]*: b" \
72 "set second instance watchpoint"
74 # Continue until initial set of b (second instance).
75 if [gdb_test "continue" \
76 "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 0.*New value = 5.*"\
77 "continue to second instance watchpoint, first time"] then {
81 # Continue inward for a few iterations
82 gdb_test "continue" "Breakpoint.* recurse \\(a=4\\).*" \
83 "continue to recurse (a = 4)"
84 gdb_test "continue" "Breakpoint.* recurse \\(a=3\\).*" \
85 "continue to recurse (a = 3)"
86 gdb_test "continue" "Breakpoint.* recurse \\(a=2\\).*" \
87 "continue to recurse (a = 2)"
88 gdb_test "continue" "Breakpoint.* recurse \\(a=1\\).*" \
89 "continue to recurse (a = 1)"
91 # Continue until second set of b (second instance).
92 if [gdb_test "continue" \
93 "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 5.*New value = 120.*return.*" \
94 "continue to second instance watchpoint, second time"] then {
98 # Continue again. We should have a watchpoint go out of scope now
99 if [gdb_test "continue" \
100 "Continuing.*\[Ww\]atchpoint.*deleted.*recurse \\(a=6\\) .*" \
101 "second instance watchpoint deleted when leaving scope"] then {
105 # Continue until second set of b (first instance).
106 # 24320 is allowed as the final value for b as that's the value
107 # b would have on systems with 16bit integers.
109 # We could fix the test program to deal with this too.
110 if [gdb_test "continue" \
111 "Continuing.*\[Ww\]atchpoint.*b.*Old value = 10.*New value = \(3628800|24320\).*return.*" \
112 "continue to first instance watchpoint, second time"] then {
116 # Continue again. We should have a watchpoint go out of scope now.
118 # The former version expected the test to return to main().
119 # Now it expects the test to return to main or to stop in the
120 # function's epilogue.
122 # The problem is that gdb needs to (but doesn't) understand
123 # function epilogues in the same way as for prologues.
125 # If there is no hardware watchpoint (such as a x86 debug register),
126 # then watchpoints are done "the hard way" by single-stepping the
127 # target until the value of the watched variable changes. If you
128 # are single-stepping, you will eventually step into an epilogue.
129 # When you do that, the "top" stack frame may become partially
130 # deconstructed (as when you pop the frame pointer, for instance),
131 # and from that point on, GDB can no longer make sense of the stack.
133 # A test which stops in the epilogue is trying to determine when GDB
134 # leaves the stack frame in which the watchpoint was created. It does
135 # this basically by watching for the frame pointer to change. When
136 # the frame pointer changes, the test expects to be back in main, but
137 # instead it is still in the epilogue of the callee.
138 if [gdb_test "continue" \
139 "Continuing.*\[Ww\]atchpoint.*deleted.*\(main \\(\\) \|21.*\}\).*" \
140 "first instance watchpoint deleted when leaving scope"] then {
144 gdb_stop_suppressing_tests
147 # Preserve the old timeout, and set a new one that should be
148 # sufficient to avoid timing out during this test.
149 set oldtimeout $timeout
150 set timeout [expr "$timeout + 60"]
151 verbose "Timeout is now $timeout seconds" 2
155 # Restore the preserved old timeout value.
156 set timeout $oldtimeout
157 verbose "Timeout is now $timeout seconds" 2