gdb2495.exp revision 1.8 
1# Copyright 2009-2019 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# In gdb inferior function calls, if a C++ exception is raised in the
18# dummy-frame, and the exception handler is (normally, and expected to
19# be) out-of-frame, the default C++ handler will (wrongly) be called
20# in an inferior function call.
21# This is incorrect as an exception can normally and legally be handled
22# out-of-frame.  The confines of the dummy frame prevent the unwinder
23# from finding the correct handler (or any handler, unless it is
24# in-frame).  The default handler calls std::terminate.  This will kill
25# the inferior.  Assert that terminate should never be called in an
26# inferior function call.  These tests test the functionality around
27# unwinding that sequence and also tests the flag behaviour gating this
28# functionality.
29#
30# PR c++/9600.
31
32# This test is largely based of gdb.base/callfuncs.exp.
33
34if { [skip_cplus_tests] } { continue }
35
36if [target_info exists gdb,nosignals] {
37    verbose "Skipping gdb2495.exp because of nosignals."
38    continue
39}
40
41# On SPU this test fails because the executable exceeds local storage size.
42if { [istarget "spu*-*-*"] } {
43        return 0
44}
45
46standard_testfile .cc
47
48# Create and source the file that provides information about the compiler
49# used to compile the test case.
50if [get_compiler_info "c++"] {
51    return -1
52}
53
54# Some targets can't do function calls, so don't even bother with this
55# test.
56if [target_info exists gdb,cannot_call_functions] {
57    unsupported "this target can not call functions"
58    continue
59}
60
61if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
62    return -1
63}
64
65if ![runto_main] then {
66    perror "couldn't run to main"
67    continue
68}
69
70# See http://sourceware.org/gdb/bugs/2495
71
72# Test normal baseline behaviour. Call a function that
73# does not raise an exception.
74gdb_test "p exceptions.no_throw_function()" " = 1"
75# And one that does but handles it in-frame.
76gdb_test "p exceptions.throw_function_with_handler()" " = 2"
77# Both should return normally.
78
79# Test basic unwind.  Call a function that raises an exception but
80# does not handle it.  It should be rewound.
81gdb_test "p exceptions.throw_function()" \
82    "The program being debugged entered a std::terminate call, .*" \
83    "call a function that raises an exception without a handler."
84
85# Make sure that after rewinding we are back at the call parent.
86gdb_test "bt" \
87    "#0  main.*" \
88    "bt after returning from a popped frame"
89
90# Make sure the only breakpoint is the one set via the runto_main
91# call and that the std::terminate breakpoint has evaporated and
92# cleaned-up.
93gdb_test "info breakpoints" \
94    "gdb2495\.cc.*"
95
96# Turn off this new behaviour.
97gdb_test_no_output "set unwind-on-terminating-exception off"
98
99# Check that it is turned off.
100gdb_test "show unwind-on-terminating-exception" \
101    "exception is unhandled while in a call dummy is off.*" \
102    "turn off unwind on terminating exception flag"
103
104# Check that the old behaviour is restored.
105gdb_test "p exceptions.throw_function()" \
106    "The program being debugged was signaled while in a function called .*" \
107    "call a function that raises an exception with unwinding off.."
108
109# Restart the inferior back at main.
110if ![runto_main] then {
111    perror "couldn't run to main"
112    continue
113}
114
115
116# Check to see if the new behaviour alters the unwind signal
117# behaviour; it should not.  Test both on and off states.
118
119# Turn on unwind on signal behaviour.
120gdb_test_no_output "set unwindonsignal on"
121
122# Check that it is turned on.
123gdb_test "show unwindonsignal" \
124    "signal is received while in a call dummy is on.*" \
125    "turn on unwind on signal"
126
127# Check to see if new behaviour interferes with
128# normal signal handling in inferior function calls.
129gdb_test "p exceptions.raise_signal(1)" \
130    "To change this behavior use \"set unwindonsignal off\".*"
131
132# And reverse - turn off again.
133gdb_test_no_output "set unwindonsignal off"
134
135# Check that it is actually turned off.
136gdb_test "show unwindonsignal" \
137    "signal is received while in a call dummy is off.*" \
138    "turn off unwind on signal"
139
140# Check to see if new behaviour interferes with
141# normal signal handling in inferior function calls.
142gdb_test "p exceptions.raise_signal(1)" \
143    "To change this behavior use \"set unwindonsignal on\".*"
144