gdb/testsuite/gdb.cp/gdb2495.exp

   1 # Copyright 2009-2014 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     setup_xfail "*-*-*" 2416
  58     fail "This target can not call functions"
  59     continue
  60 }
  61
  62 if {[prepare_for_testing $testfile.exp $testfile $srcfile {debug c++}]} {
  63     return -1
  64 }
  65
  66 if ![runto_main] then {
  67     perror "couldn't run to main"
  68     continue
  69 }
  70
  71 # See http://sourceware.org/gdb/bugs/2495
  72
  73 # Test normal baseline behaviour. Call a function that
  74 # does not raise an exception.
  75 gdb_test "p exceptions.no_throw_function()" " = 1"
  76 # And one that does but handles it in-frame.
  77 gdb_test "p exceptions.throw_function_with_handler()" " = 2"
  78 # Both should return normally.
  79
  80 # Test basic unwind.  Call a function that raises an exception but
  81 # does not handle it.  It should be rewound.
  82 gdb_test "p exceptions.throw_function()" \
  83     "The program being debugged entered a std::terminate call, .*" \
  84     "Call a function that raises an exception without a handler."
  85
  86 # Make sure that after rewinding we are back at the call parent.
  87 gdb_test "bt" \
  88     "#0  main.*" \
  89     "bt after returning from a popped frame"
  90
  91 # Make sure the only breakpoint is the one set via the runto_main
  92 # call and that the std::terminate breakpoint has evaporated and
  93 # cleaned-up.
  94 gdb_test "info breakpoints" \
  95     "gdb2495\.cc.*"
  96
  97 # Turn off this new behaviour.
  98 gdb_test_multiple "set unwind-on-terminating-exception off" \
  99     "Turn unwind-on-terminating-exception off" {
 100     -re "$gdb_prompt $" {pass "set unwinn-on-terminating-exception off"}
 101     timeout {fail "(timeout) set unwind-on-terminating-exception off"}
 102 }
 103
 104 # Check that it is turned off.
 105 gdb_test "show unwind-on-terminating-exception" \
 106     "exception is unhandled while in a call dummy is off.*" \
 107     "Turn off unwind on terminating exception flag"
 108
 109 # Check that the old behaviour is restored.
 110 gdb_test "p exceptions.throw_function()" \
 111     "The program being debugged was signaled while in a function called .*" \
 112     "Call a function that raises an exception with unwinding off.."
 113
 114 # Restart the inferior back at main.
 115 if ![runto_main] then {
 116     perror "couldn't run to main"
 117     continue
 118 }
 119
 120
 121 # Check to see if the new behaviour alters the unwind signal
 122 # behaviour; it should not.  Test both on and off states.
 123
 124 # Turn on unwind on signal behaviour.
 125 gdb_test_multiple "set unwindonsignal on" "Turn unwindonsignal on" {
 126     -re "$gdb_prompt $" {pass "set unwindonsignal on"}
 127     timeout {fail "(timeout) set unwindonsignal on"}
 128 }
 129
 130 # Check that it is turned on.
 131 gdb_test "show unwindonsignal" \
 132     "signal is received while in a call dummy is on.*" \
 133     "Turn on unwind on signal"
 134
 135 # Check to see if new behaviour interferes with
 136 # normal signal handling in inferior function calls.
 137 gdb_test "p exceptions.raise_signal(1)" \
 138     "To change this behavior use \"set unwindonsignal off\".*"
 139
 140 # And reverse - turn off again.
 141 gdb_test_multiple "set unwindonsignal off" "Turn unwindonsignal off" {
 142     -re "$gdb_prompt $" {pass "set unwindonsignal off"}
 143     timeout {fail "(timeout) set unwindonsignal off"}
 144 }
 145
 146 # Check that it is actually turned off.
 147 gdb_test "show unwindonsignal" \
 148     "signal is received while in a call dummy is off.*" \
 149     "Turn off unwind on signal"
 150
 151 # Check to see if new behaviour interferes with
 152 # normal signal handling in inferior function calls.
 153 gdb_test "p exceptions.raise_signal(1)" \
 154     "To change this behavior use \"set unwindonsignal on\".*"