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3666a048 | 1 | # Copyright 2009-2021 Free Software Foundation, Inc. |
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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. | |
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29 | # |
30 | # PR c++/9600. | |
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31 | |
32 | # This test is largely based of gdb.base/callfuncs.exp. | |
33 | ||
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34 | if { [skip_cplus_tests] } { continue } |
35 | ||
28f24826 DJ |
36 | if [target_info exists gdb,nosignals] { |
37 | verbose "Skipping gdb2495.exp because of nosignals." | |
38 | continue | |
39 | } | |
40 | ||
f5f3a911 | 41 | standard_testfile .cc |
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42 | |
43 | # Create and source the file that provides information about the compiler | |
44 | # used to compile the test case. | |
4c93b1db | 45 | if [get_compiler_info "c++"] { |
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46 | return -1 |
47 | } | |
48 | ||
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49 | # Some targets can't do function calls, so don't even bother with this |
50 | # test. | |
51 | if [target_info exists gdb,cannot_call_functions] { | |
bc6c7af4 | 52 | unsupported "this target can not call functions" |
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53 | continue |
54 | } | |
55 | ||
5b362f04 | 56 | if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} { |
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57 | return -1 |
58 | } | |
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59 | |
60 | if ![runto_main] then { | |
61 | perror "couldn't run to main" | |
62 | continue | |
63 | } | |
64 | ||
65 | # See http://sourceware.org/gdb/bugs/2495 | |
66 | ||
67 | # Test normal baseline behaviour. Call a function that | |
68 | # does not raise an exception. | |
69 | gdb_test "p exceptions.no_throw_function()" " = 1" | |
70 | # And one that does but handles it in-frame. | |
71 | gdb_test "p exceptions.throw_function_with_handler()" " = 2" | |
72 | # Both should return normally. | |
73 | ||
74 | # Test basic unwind. Call a function that raises an exception but | |
75 | # does not handle it. It should be rewound. | |
76 | gdb_test "p exceptions.throw_function()" \ | |
77 | "The program being debugged entered a std::terminate call, .*" \ | |
bb95117e | 78 | "call a function that raises an exception without a handler." |
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79 | |
80 | # Make sure that after rewinding we are back at the call parent. | |
81 | gdb_test "bt" \ | |
82 | "#0 main.*" \ | |
83 | "bt after returning from a popped frame" | |
84 | ||
85 | # Make sure the only breakpoint is the one set via the runto_main | |
86 | # call and that the std::terminate breakpoint has evaporated and | |
87 | # cleaned-up. | |
88 | gdb_test "info breakpoints" \ | |
0344e878 | 89 | "gdb2495\.cc.*" |
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90 | |
91 | # Turn off this new behaviour. | |
fb9feb35 | 92 | gdb_test_no_output "set unwind-on-terminating-exception off" |
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93 | |
94 | # Check that it is turned off. | |
95 | gdb_test "show unwind-on-terminating-exception" \ | |
96 | "exception is unhandled while in a call dummy is off.*" \ | |
bb95117e | 97 | "turn off unwind on terminating exception flag" |
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98 | |
99 | # Check that the old behaviour is restored. | |
100 | gdb_test "p exceptions.throw_function()" \ | |
101 | "The program being debugged was signaled while in a function called .*" \ | |
bb95117e | 102 | "call a function that raises an exception with unwinding off.." |
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103 | |
104 | # Restart the inferior back at main. | |
105 | if ![runto_main] then { | |
106 | perror "couldn't run to main" | |
107 | continue | |
108 | } | |
109 | ||
110 | ||
111 | # Check to see if the new behaviour alters the unwind signal | |
112 | # behaviour; it should not. Test both on and off states. | |
113 | ||
114 | # Turn on unwind on signal behaviour. | |
018572b8 | 115 | gdb_test_no_output "set unwindonsignal on" |
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116 | |
117 | # Check that it is turned on. | |
118 | gdb_test "show unwindonsignal" \ | |
119 | "signal is received while in a call dummy is on.*" \ | |
bb95117e | 120 | "turn on unwind on signal" |
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121 | |
122 | # Check to see if new behaviour interferes with | |
123 | # normal signal handling in inferior function calls. | |
124 | gdb_test "p exceptions.raise_signal(1)" \ | |
125 | "To change this behavior use \"set unwindonsignal off\".*" | |
126 | ||
127 | # And reverse - turn off again. | |
018572b8 | 128 | gdb_test_no_output "set unwindonsignal off" |
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129 | |
130 | # Check that it is actually turned off. | |
131 | gdb_test "show unwindonsignal" \ | |
132 | "signal is received while in a call dummy is off.*" \ | |
bb95117e | 133 | "turn off unwind on signal" |
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134 | |
135 | # Check to see if new behaviour interferes with | |
136 | # normal signal handling in inferior function calls. | |
137 | gdb_test "p exceptions.raise_signal(1)" \ | |
138 | "To change this behavior use \"set unwindonsignal on\".*" |