1# Copyright 2009-2023 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] } { return } 35 36if [target_info exists gdb,nosignals] { 37 verbose "Skipping gdb2495.exp because of nosignals." 38 return 39} 40 41standard_testfile .cc 42 43# Some targets can't do function calls, so don't even bother with this 44# test. 45if [target_info exists gdb,cannot_call_functions] { 46 unsupported "this target can not call functions" 47 return 48} 49 50if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} { 51 return -1 52} 53 54if {![runto_main]} { 55 return 56} 57 58# See http://sourceware.org/gdb/bugs/2495 59 60# Test normal baseline behaviour. Call a function that 61# does not raise an exception. 62gdb_test "p exceptions.no_throw_function()" " = 1" 63# And one that does but handles it in-frame. 64gdb_test "p exceptions.throw_function_with_handler()" " = 2" 65# Both should return normally. 66 67# Test basic unwind. Call a function that raises an exception but 68# does not handle it. It should be rewound. 69gdb_test "p exceptions.throw_function()" \ 70 "The program being debugged entered a std::terminate call, .*" \ 71 "call a function that raises an exception without a handler." 72 73# Make sure that after rewinding we are back at the call parent. 74gdb_test "bt" \ 75 "#0 main.*" \ 76 "bt after returning from a popped frame" 77 78# Make sure the only breakpoint is the one set via the runto_main 79# call and that the std::terminate breakpoint has evaporated and 80# cleaned-up. 81gdb_test "info breakpoints" \ 82 "gdb2495\.cc.*" 83 84# Turn off this new behaviour. 85gdb_test_no_output "set unwind-on-terminating-exception off" 86 87# Check that it is turned off. 88gdb_test "show unwind-on-terminating-exception" \ 89 "exception is unhandled while in a call dummy is off.*" \ 90 "turn off unwind on terminating exception flag" 91 92# Check that the old behaviour is restored. 93gdb_test "p exceptions.throw_function()" \ 94 "The program being debugged was signaled while in a function called .*" \ 95 "call a function that raises an exception with unwinding off.." 96 97# Restart the inferior back at main. 98if {![runto_main]} { 99 return 100} 101 102 103# Check to see if the new behaviour alters the unwind signal 104# behaviour; it should not. Test both on and off states. 105 106# Turn on unwind on signal behaviour. 107gdb_test_no_output "set unwindonsignal on" 108 109# Check that it is turned on. 110gdb_test "show unwindonsignal" \ 111 "signal is received while in a call dummy is on.*" \ 112 "turn on unwind on signal" 113 114# Check to see if new behaviour interferes with 115# normal signal handling in inferior function calls. 116gdb_test "p exceptions.raise_signal(1)" \ 117 "To change this behavior use \"set unwindonsignal off\".*" \ 118 "check for unwindonsignal off message" 119 120# And reverse - turn off again. 121gdb_test_no_output "set unwindonsignal off" 122 123# Check that it is actually turned off. 124gdb_test "show unwindonsignal" \ 125 "signal is received while in a call dummy is off.*" \ 126 "turn off unwind on signal" 127 128# Check to see if new behaviour interferes with 129# normal signal handling in inferior function calls. 130gdb_test "p exceptions.raise_signal(1)" \ 131 "To change this behavior use \"set unwindonsignal on\".*" \ 132 "check for unwindonsignal on message" 133