gdb/testsuite/gdb.cp/gdb2495.exp

   1 # Copyright 2009 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 # This test is largely based of gdb.base/callfuncs.exp.
  31
  32 if $tracelevel then {
  33     strace $tracelevel
  34 }
  35
  36 if { [skip_cplus_tests] } { continue }
  37
  38 set prms_id 2495
  39 set bug_id 0
  40
  41 set testfile "gdb2495"
  42 set srcfile ${testfile}.cc
  43 set binfile $objdir/$subdir/$testfile
  44
  45 # Create and source the file that provides information about the compiler
  46 # used to compile the test case.
  47 if [get_compiler_info ${binfile} "c++"] {
  48     return -1
  49 }
  50
  51 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
  52      untested gdb2495.exp
  53      return -1
  54 }
  55
  56 # Some targets can't do function calls, so don't even bother with this
  57 # test.
  58 if [target_info exists gdb,cannot_call_functions] {
  59     setup_xfail "*-*-*" 2416
  60     fail "This target can not call functions"
  61     continue
  62 }
  63
  64 gdb_exit
  65 gdb_start
  66 gdb_reinitialize_dir $srcdir/$subdir
  67 gdb_load ${binfile}
  68
  69 if ![runto_main] then {
  70     perror "couldn't run to main"
  71     continue
  72 }
  73
  74 # See http://sourceware.org/gdb/bugs/2495
  75
  76 # Test normal baseline behaviour. Call a function that
  77 # does not raise an exception.
  78 gdb_test "p exceptions.no_throw_function()" " = 1"
  79 # And one that does but handles it in-frame.
  80 gdb_test "p exceptions.throw_function_with_handler()" " = 2"
  81 # Both should return normally.
  82
  83 # Test basic unwind.  Call a function that raises an exception but
  84 # does not handle it.  It should be rewound.
  85 gdb_test "p exceptions.throw_function()" \
  86     "The program being debugged entered a std::terminate call, .*" \
  87     "Call a function that raises an exception without a handler."
  88
  89 # Make sure that after rewinding we are back at the call parent.
  90 gdb_test "bt" \
  91     "#0  main.*" \
  92     "bt after returning from a popped frame"
  93
  94 # Make sure the only breakpoint is the one set via the runto_main
  95 # call and that the std::terminate breakpoint has evaporated and
  96 # cleaned-up.
  97 gdb_test "info breakpoints" \
  98     "gdb.cp/gdb2495\.cc.*"
  99
 100 # Turn off this new behaviour.
 101 gdb_test_multiple "set unwind-on-terminating-exception off" \
 102     "Turn unwind-on-terminating-exception off" {
 103     -re "$gdb_prompt $" {pass "set unwinn-on-terminating-exception off"}
 104     timeout {fail "(timeout) set unwind-on-terminating-exception off"}
 105 }
 106
 107 # Check that it is turned off.
 108 gdb_test "show unwind-on-terminating-exception" \
 109     "exception is unhandled while in a call dummy is off.*" \
 110     "Turn off unwind on terminating exception flag"
 111
 112 # Check that the old behaviour is restored.
 113 gdb_test "p exceptions.throw_function()" \
 114     "The program being debugged was signaled while in a function called .*" \
 115     "Call a function that raises an exception with unwinding off.."
 116
 117 # Restart the inferior back at main.
 118 if ![runto_main] then {
 119     perror "couldn't run to main"
 120     continue
 121 }
 122
 123
 124 # Check to see if the new behaviour alters the unwind signal
 125 # behaviour; it should not.  Test both on and off states.
 126
 127 # Turn on unwind on signal behaviour.
 128 gdb_test_multiple "set unwindonsignal on" "Turn unwindonsignal on" {
 129     -re "$gdb_prompt $" {pass "set unwindonsignal on"}
 130     timeout {fail "(timeout) set unwindonsignal on"}
 131 }
 132
 133 # Check that it is turned on.
 134 gdb_test "show unwindonsignal" \
 135     "signal is received while in a call dummy is on.*" \
 136     "Turn on unwind on signal"
 137
 138 # Check to see if new behaviour interferes with
 139 # normal signal handling in inferior function calls.
 140 gdb_test "p exceptions.raise_signal(1)" \
 141     "To change this behavior use \"set unwindonsignal off\".*"
 142
 143 # And reverse - turn off again.
 144 gdb_test_multiple "set unwindonsignal off" "Turn unwindonsignal off" {
 145     -re "$gdb_prompt $" {pass "set unwindonsignal off"}
 146     timeout {fail "(timeout) set unwindonsignal off"}
 147 }
 148
 149 # Check that it is actually turned off.
 150 gdb_test "show unwindonsignal" \
 151     "signal is received while in a call dummy is off.*" \
 152     "Turn off unwind on signal"
 153
 154 # Check to see if new behaviour interferes with
 155 # normal signal handling in inferior function calls.
 156 gdb_test "p exceptions.raise_signal(1)" \
 157     "To change this behavior use \"set unwindonsignal on\".*"