gdb/testsuite/gdb.cp/gdb2495.exp

   1 # Copyright 2009-2017 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 # On SPU this test fails because the executable exceeds local storage size.
  42 if { [istarget "spu*-*-*"] } {
  43         return 0
  44 }
  45
  46 standard_testfile .cc
  47
  48 # Create and source the file that provides information about the compiler
  49 # used to compile the test case.
  50 if [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.
  56 if [target_info exists gdb,cannot_call_functions] {
  57     unsupported "this target can not call functions"
  58     continue
  59 }
  60
  61 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
  62     return -1
  63 }
  64
  65 if ![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.
  74 gdb_test "p exceptions.no_throw_function()" " = 1"
  75 # And one that does but handles it in-frame.
  76 gdb_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.
  81 gdb_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.
  86 gdb_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.
  93 gdb_test "info breakpoints" \
  94     "gdb2495\.cc.*"
  95
  96 # Turn off this new behaviour.
  97 gdb_test_no_output "set unwind-on-terminating-exception off"
  98
  99 # Check that it is turned off.
 100 gdb_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.
 105 gdb_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.
 110 if ![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.
 120 gdb_test_no_output "set unwindonsignal on"
 121
 122 # Check that it is turned on.
 123 gdb_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.
 129 gdb_test "p exceptions.raise_signal(1)" \
 130     "To change this behavior use \"set unwindonsignal off\".*"
 131
 132 # And reverse - turn off again.
 133 gdb_test_no_output "set unwindonsignal off"
 134
 135 # Check that it is actually turned off.
 136 gdb_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.
 142 gdb_test "p exceptions.raise_signal(1)" \
 143     "To change this behavior use \"set unwindonsignal on\".*"