gdb/testsuite/gdb.cp/gdb2495.exp

   1 # Copyright 2009, 2010 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 $tracelevel then {
  35     strace $tracelevel
  36 }
  37
  38 if { [skip_cplus_tests] } { continue }
  39
  40 if [target_info exists gdb,nosignals] {
  41     verbose "Skipping gdb2495.exp because of nosignals."
  42     continue
  43 }
  44
  45 # On SPU this test fails because the executable exceeds local storage size.
  46 if { [istarget "spu*-*-*"] } {
  47         return 0
  48 }
  49
  50 set testfile "gdb2495"
  51 set srcfile ${testfile}.cc
  52 set binfile $objdir/$subdir/$testfile
  53
  54 # Create and source the file that provides information about the compiler
  55 # used to compile the test case.
  56 if [get_compiler_info ${binfile} "c++"] {
  57     return -1
  58 }
  59
  60 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
  61      untested gdb2495.exp
  62      return -1
  63 }
  64
  65 # Some targets can't do function calls, so don't even bother with this
  66 # test.
  67 if [target_info exists gdb,cannot_call_functions] {
  68     setup_xfail "*-*-*" 2416
  69     fail "This target can not call functions"
  70     continue
  71 }
  72
  73 gdb_exit
  74 gdb_start
  75 gdb_reinitialize_dir $srcdir/$subdir
  76 gdb_load ${binfile}
  77
  78 if ![runto_main] then {
  79     perror "couldn't run to main"
  80     continue
  81 }
  82
  83 # See http://sourceware.org/gdb/bugs/2495
  84
  85 # Test normal baseline behaviour. Call a function that
  86 # does not raise an exception.
  87 gdb_test "p exceptions.no_throw_function()" " = 1"
  88 # And one that does but handles it in-frame.
  89 gdb_test "p exceptions.throw_function_with_handler()" " = 2"
  90 # Both should return normally.
  91
  92 # Test basic unwind.  Call a function that raises an exception but
  93 # does not handle it.  It should be rewound.
  94 gdb_test "p exceptions.throw_function()" \
  95     "The program being debugged entered a std::terminate call, .*" \
  96     "Call a function that raises an exception without a handler."
  97
  98 # Make sure that after rewinding we are back at the call parent.
  99 gdb_test "bt" \
 100     "#0  main.*" \
 101     "bt after returning from a popped frame"
 102
 103 # Make sure the only breakpoint is the one set via the runto_main
 104 # call and that the std::terminate breakpoint has evaporated and
 105 # cleaned-up.
 106 gdb_test "info breakpoints" \
 107     "gdb.cp/gdb2495\.cc.*"
 108
 109 # Turn off this new behaviour.
 110 gdb_test_multiple "set unwind-on-terminating-exception off" \
 111     "Turn unwind-on-terminating-exception off" {
 112     -re "$gdb_prompt $" {pass "set unwinn-on-terminating-exception off"}
 113     timeout {fail "(timeout) set unwind-on-terminating-exception off"}
 114 }
 115
 116 # Check that it is turned off.
 117 gdb_test "show unwind-on-terminating-exception" \
 118     "exception is unhandled while in a call dummy is off.*" \
 119     "Turn off unwind on terminating exception flag"
 120
 121 # Check that the old behaviour is restored.
 122 gdb_test "p exceptions.throw_function()" \
 123     "The program being debugged was signaled while in a function called .*" \
 124     "Call a function that raises an exception with unwinding off.."
 125
 126 # Restart the inferior back at main.
 127 if ![runto_main] then {
 128     perror "couldn't run to main"
 129     continue
 130 }
 131
 132
 133 # Check to see if the new behaviour alters the unwind signal
 134 # behaviour; it should not.  Test both on and off states.
 135
 136 # Turn on unwind on signal behaviour.
 137 gdb_test_multiple "set unwindonsignal on" "Turn unwindonsignal on" {
 138     -re "$gdb_prompt $" {pass "set unwindonsignal on"}
 139     timeout {fail "(timeout) set unwindonsignal on"}
 140 }
 141
 142 # Check that it is turned on.
 143 gdb_test "show unwindonsignal" \
 144     "signal is received while in a call dummy is on.*" \
 145     "Turn on unwind on signal"
 146
 147 # Check to see if new behaviour interferes with
 148 # normal signal handling in inferior function calls.
 149 gdb_test "p exceptions.raise_signal(1)" \
 150     "To change this behavior use \"set unwindonsignal off\".*"
 151
 152 # And reverse - turn off again.
 153 gdb_test_multiple "set unwindonsignal off" "Turn unwindonsignal off" {
 154     -re "$gdb_prompt $" {pass "set unwindonsignal off"}
 155     timeout {fail "(timeout) set unwindonsignal off"}
 156 }
 157
 158 # Check that it is actually turned off.
 159 gdb_test "show unwindonsignal" \
 160     "signal is received while in a call dummy is off.*" \
 161     "Turn off unwind on signal"
 162
 163 # Check to see if new behaviour interferes with
 164 # normal signal handling in inferior function calls.
 165 gdb_test "p exceptions.raise_signal(1)" \
 166     "To change this behavior use \"set unwindonsignal on\".*"