Subversion Repositories scarts

# Copyright 2002, 2003, 2004, 2007, 2008 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 .

# This file is part of the gdb testsuite

# Test casting, especially between class types or pointer-to-class

# types.

# This file is part of the gdb testsuite

if $tracelevel then {

        strace $tracelevel

        }

#

# test running programs

#

set prms_id 0

set bug_id 0

if { [skip_cplus_tests] } { continue }

set testfile "casts"

set srcfile ${testfile}.cc

set binfile ${objdir}/${subdir}/${testfile}

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

    return -1;

}

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

     untested casts.exp

     return -1

}

gdb_exit

gdb_start

gdb_reinitialize_dir $srcdir/$subdir

gdb_load ${binfile}

if ![runto_main] then {

    perror "couldn't run to breakpoint"

    continue

}

gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \

    "Breakpoint.*at.* file .*" \

    ""

gdb_test "continue" "Breakpoint .* at .*casts.cc.*" ""

# Casting a pointer to a base class to a pointer to a derived class

# should yield the entire derived class.  Until August 2002, GDB got

# the enclosing type on `(B *) a' wrong: while the value's static type

# was `B *', as it should be, the enclosing type (which is supposed to

# be the dynamic type) was `A *'.  It's senseless to have a static

# type derived from the dynamic type; it should be the other way

# 'round.  Dereferencing this oddly typed pointer yielded a value in

# which only the base class's members were initialized, since GDB uses

# the enclosing type to decide how many bytes to read.  Members from

# the derived class were garbage, from GDB's address space.

gdb_test "print * (B *) a" ".* = { = {a = 42}, b = 1729}" \

    "cast base class pointer to derived class pointer"

# Check also that we get the same results from letting the compiler do

# the dereference.

gdb_test "print * b" ".* = { = {a = 42}, b = 1729}" \

    "let compiler cast base class pointer to derived class pointer"