1# Copyright 2002, 2003, 2004 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 2 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, write to the Free Software
15# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
16
17# This file is part of the gdb testsuite
18
19# Test casting, especially between class types or pointer-to-class
20# types.
21
22# This file is part of the gdb testsuite
23
24if $tracelevel then {
25        strace $tracelevel
26        }
27
28#
29# test running programs
30#
31
32set prms_id 0
33set bug_id 0
34
35if { [skip_cplus_tests] } { continue }
36
37set testfile "casts"
38set srcfile ${testfile}.cc
39set binfile ${objdir}/${subdir}/${testfile}
40
41if [get_compiler_info ${binfile} "c++"] {
42    return -1;
43}
44
45if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
46     gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
47}
48
49
50gdb_exit
51gdb_start
52gdb_reinitialize_dir $srcdir/$subdir
53gdb_load ${binfile}
54
55if ![runto_main] then {
56    perror "couldn't run to breakpoint"
57    continue
58}
59
60gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \
61    "Breakpoint.*at.* file .*" \
62    ""
63
64gdb_test "continue" "Breakpoint .* at .*casts.cc.*" ""
65
66# Casting a pointer to a base class to a pointer to a derived class
67# should yield the entire derived class.  Until August 2002, GDB got
68# the enclosing type on `(B *) a' wrong: while the value's static type
69# was `B *', as it should be, the enclosing type (which is supposed to
70# be the dynamic type) was `A *'.  It's senseless to have a static
71# type derived from the dynamic type; it should be the other way
72# 'round.  Dereferencing this oddly typed pointer yielded a value in
73# which only the base class's members were initialized, since GDB uses
74# the enclosing type to decide how many bytes to read.  Members from
75# the derived class were garbage, from GDB's address space.
76gdb_test "print * (B *) a" ".* = {<A> = {a = 42}, b = 1729}" \
77    "cast base class pointer to derived class pointer"
78
79# Check also that we get the same results from letting the compiler do
80# the dereference.
81gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \
82    "let compiler cast base class pointer to derived class pointer"
83