Subversion Repositories openrisc_2011-10-31

# Copyright 2009, 2010 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see .

# In gdb inferior function calls, if a C++ exception is raised in the

# dummy-frame, and the exception handler is (normally, and expected to

# be) out-of-frame, the default C++ handler will (wrongly) be called

# in an inferior function call.

# This is incorrect as an exception can normally and legally be handled

# out-of-frame.  The confines of the dummy frame prevent the unwinder

# from finding the correct handler (or any handler, unless it is

# in-frame).  The default handler calls std::terminate.  This will kill

# the inferior.  Assert that terminate should never be called in an

# inferior function call.  These tests test the functionality around

# unwinding that sequence and also tests the flag behaviour gating this

# functionality.

#

# PR c++/9600.

# This test is largely based of gdb.base/callfuncs.exp.

if $tracelevel then {

    strace $tracelevel

}

if { [skip_cplus_tests] } { continue }

if [target_info exists gdb,nosignals] {

    verbose "Skipping gdb2495.exp because of nosignals."

    continue

}

# On SPU this test fails because the executable exceeds local storage size.

if { [istarget "spu*-*-*"] } {

        return 0

}

set testfile "gdb2495"

set srcfile ${testfile}.cc

set binfile $objdir/$subdir/$testfile

# Create and source the file that provides information about the compiler

# used to compile the test case.

if [get_compiler_info ${binfile} "c++"] {

    return -1

}

if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {

     untested gdb2495.exp

     return -1

}

# Some targets can't do function calls, so don't even bother with this

# test.

if [target_info exists gdb,cannot_call_functions] {

    setup_xfail "*-*-*" 2416

    fail "This target can not call functions"

    continue

}

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

if ![runto_main] then {

    perror "couldn't run to main"

    continue

}

# See http://sourceware.org/gdb/bugs/2495

# Test normal baseline behaviour. Call a function that

# does not raise an exception.

gdb_test "p exceptions.no_throw_function()" " = 1"

# And one that does but handles it in-frame.

gdb_test "p exceptions.throw_function_with_handler()" " = 2"

# Both should return normally.

# Test basic unwind.  Call a function that raises an exception but

# does not handle it.  It should be rewound.

gdb_test "p exceptions.throw_function()" \

    "The program being debugged entered a std::terminate call, .*" \

    "Call a function that raises an exception without a handler."

# Make sure that after rewinding we are back at the call parent.

gdb_test "bt" \

    "#0  main.*" \

    "bt after returning from a popped frame"

# Make sure the only breakpoint is the one set via the runto_main

# call and that the std::terminate breakpoint has evaporated and

# cleaned-up.

gdb_test "info breakpoints" \

    "gdb.cp/gdb2495\.cc.*"

# Turn off this new behaviour.

gdb_test_multiple "set unwind-on-terminating-exception off" \

    "Turn unwind-on-terminating-exception off" {

    -re "$gdb_prompt $" {pass "set unwinn-on-terminating-exception off"}

    timeout {fail "(timeout) set unwind-on-terminating-exception off"}

}

# Check that it is turned off.

gdb_test "show unwind-on-terminating-exception" \

    "exception is unhandled while in a call dummy is off.*" \

    "Turn off unwind on terminating exception flag"

# Check that the old behaviour is restored.

gdb_test "p exceptions.throw_function()" \

    "The program being debugged was signaled while in a function called .*" \

    "Call a function that raises an exception with unwinding off.."

# Restart the inferior back at main.

if ![runto_main] then {

    perror "couldn't run to main"

    continue

}

# Check to see if the new behaviour alters the unwind signal

# behaviour; it should not.  Test both on and off states.

# Turn on unwind on signal behaviour.

gdb_test_multiple "set unwindonsignal on" "Turn unwindonsignal on" {

    -re "$gdb_prompt $" {pass "set unwindonsignal on"}

    timeout {fail "(timeout) set unwindonsignal on"}

}

# Check that it is turned on.

gdb_test "show unwindonsignal" \

    "signal is received while in a call dummy is on.*" \

    "Turn on unwind on signal"

# Check to see if new behaviour interferes with

# normal signal handling in inferior function calls.

gdb_test "p exceptions.raise_signal(1)" \

    "To change this behavior use \"set unwindonsignal off\".*"

# And reverse - turn off again.

gdb_test_multiple "set unwindonsignal off" "Turn unwindonsignal off" {

    -re "$gdb_prompt $" {pass "set unwindonsignal off"}

    timeout {fail "(timeout) set unwindonsignal off"}

}

# Check that it is actually turned off.

gdb_test "show unwindonsignal" \

    "signal is received while in a call dummy is off.*" \

    "Turn off unwind on signal"

# Check to see if new behaviour interferes with

# normal signal handling in inferior function calls.

gdb_test "p exceptions.raise_signal(1)" \

    "To change this behavior use \"set unwindonsignal on\".*"