gdb/testsuite/gdb.cp/gdb2495.exp

   1 # Copyright 2009-2021 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
  34 if { [skip_cplus_tests] } { continue }
  35
  36 if [target_info exists gdb,nosignals] {
  37     verbose "Skipping gdb2495.exp because of nosignals."
  38     continue
  39 }
  40
  41 standard_testfile .cc
  42
  43 # Create and source the file that provides information about the compiler
  44 # used to compile the test case.
  45 if [get_compiler_info "c++"] {
  46     return -1
  47 }
  48
  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] {
  52     unsupported "this target can not call functions"
  53     continue
  54 }
  55
  56 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
  57     return -1
  58 }
  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, .*" \
  78     "call a function that raises an exception without a handler."
  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" \
  89     "gdb2495\.cc.*"
  90
  91 # Turn off this new behaviour.
  92 gdb_test_no_output "set unwind-on-terminating-exception off"
  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.*" \
  97     "turn off unwind on terminating exception flag"
  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 .*" \
 102     "call a function that raises an exception with unwinding off.."
 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.
 115 gdb_test_no_output "set unwindonsignal on"
 116
 117 # Check that it is turned on.
 118 gdb_test "show unwindonsignal" \
 119     "signal is received while in a call dummy is on.*" \
 120     "turn on unwind on signal"
 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.
 128 gdb_test_no_output "set unwindonsignal off"
 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.*" \
 133     "turn off unwind on signal"
 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\".*"