* gdb.c++/casts.cc, gdb.c++/casts.exp: New test.

This commit is contained in:
Jim Blandy 2002-10-02 21:46:56 +00:00
parent 36dc181bba
commit 10abb1d48f
3 changed files with 104 additions and 0 deletions

View File

@ -1,3 +1,7 @@
2002-10-02 Jim Blandy <jimb@redhat.com>
* gdb.c++/casts.cc, gdb.c++/casts.exp: New test.
2002-10-01 Andrew Cagney <ac131313@redhat.com>
* mi1-basics.exp: Copy of mi1-basics.exp MIFLAGS set "-i=mi1".

View File

@ -0,0 +1,20 @@
struct A
{
int a;
A (int aa): a (aa) {}
};
struct B: public A
{
int b;
B (int aa, int bb): A (aa), b(bb) {}
};
int
main (int argc, char **argv)
{
A *a = new B(42, 1729);
B *b = (B *) a;
return 0; /* breakpoint spot: casts.exp: 1 */
}

View File

@ -0,0 +1,80 @@
# Copyright 2002 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu
# 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++}] != "" } {
gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
}
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \
"Breakpoint.*at.* file .*" \
""
gdb_test "run" "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> = {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> = {a = 42}, b = 1729}" \
"let compiler cast base class pointer to derived class pointer"