1 # Copyright 2002, 2003 Free Software Foundation, Inc.
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.
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.
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.
17 # Please email any bugs, comments, and/or additions to this file to:
18 # bug-gdb@prep.ai.mit.edu
20 # This file is part of the gdb testsuite
22 # Test casting, especially between class types or pointer-to-class
25 # This file is part of the gdb testsuite
32 # test running programs
38 if { [skip_cplus_tests] } { continue }
41 set srcfile ${testfile}.cc
42 set binfile ${objdir}/${subdir}/${testfile}
44 if [get_compiler_info ${binfile} "c++"] {
48 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
49 gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
55 gdb_reinitialize_dir $srcdir/$subdir
58 if ![runto_main] then {
59 perror "couldn't run to breakpoint"
63 gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \
64 "Breakpoint.*at.* file .*" \
67 gdb_test "continue" "Breakpoint .* at .*casts.cc.*" ""
69 # Casting a pointer to a base class to a pointer to a derived class
70 # should yield the entire derived class. Until August 2002, GDB got
71 # the enclosing type on `(B *) a' wrong: while the value's static type
72 # was `B *', as it should be, the enclosing type (which is supposed to
73 # be the dynamic type) was `A *'. It's senseless to have a static
74 # type derived from the dynamic type; it should be the other way
75 # 'round. Dereferencing this oddly typed pointer yielded a value in
76 # which only the base class's members were initialized, since GDB uses
77 # the enclosing type to decide how many bytes to read. Members from
78 # the derived class were garbage, from GDB's address space.
79 gdb_test "print * (B *) a" ".* = {<A> = {a = 42}, b = 1729}" \
80 "cast base class pointer to derived class pointer"
82 # Check also that we get the same results from letting the compiler do
84 gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \
85 "let compiler cast base class pointer to derived class pointer"