1 # Copyright 2002, 2003, 2004, 2007, 2008, 2009, 2010
2 # Free Software Foundation, Inc.
4 # This program is free software; you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License as published by
6 # the Free Software Foundation; either version 3 of the License, or
7 # (at your option) any later version.
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 # GNU General Public License for more details.
14 # You should have received a copy of the GNU General Public License
15 # along with this program. If not, see <http://www.gnu.org/licenses/>.
17 # This file is part of the gdb testsuite
19 # Test casting, especially between class types or pointer-to-class
22 # This file is part of the gdb testsuite
29 # test running programs
35 if { [skip_cplus_tests] } { continue }
38 set srcfile ${testfile}.cc
39 set binfile ${objdir}/${subdir}/${testfile}
41 if [get_compiler_info ${binfile} "c++"] {
45 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
53 gdb_reinitialize_dir $srcdir/$subdir
56 if ![runto_main] then {
57 perror "couldn't run to breakpoint"
61 gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \
62 "Breakpoint.*at.* file .*" \
65 gdb_test "continue" "Breakpoint .* at .*casts.cc.*" ""
67 # Casting a pointer to a base class to a pointer to a derived class
68 # should yield the entire derived class. Until August 2002, GDB got
69 # the enclosing type on `(B *) a' wrong: while the value's static type
70 # was `B *', as it should be, the enclosing type (which is supposed to
71 # be the dynamic type) was `A *'. It's senseless to have a static
72 # type derived from the dynamic type; it should be the other way
73 # 'round. Dereferencing this oddly typed pointer yielded a value in
74 # which only the base class's members were initialized, since GDB uses
75 # the enclosing type to decide how many bytes to read. Members from
76 # the derived class were garbage, from GDB's address space.
77 gdb_test "print * (B *) a" ".* = {<A> = {a = 42}, b = 1729}" \
78 "cast base class pointer to derived class pointer"
80 # Check also that we get the same results from letting the compiler do
82 gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \
83 "let compiler cast base class pointer to derived class pointer"
85 # Check upcasting (it is trivial but still).
86 gdb_test "print * (A *) b" ".* = {a = 42}" \
87 "cast derived class pointer to base class pointer"
91 gdb_test "print (A &) br" ".* = .A &.* {a = 42}" \
92 "cast derived class reference to base class reference"
95 gdb_test "print (B &) ar" ".* = .B.* {<A> = {a = 42}, b = 1729}" \
96 "cast base class reference to derived class reference"
98 # Check compiler casting
99 gdb_test "print br" ".* = .B.* {<A> = {a = 42}, b = 1729}" \
100 "let compiler cast base class reference to derived class reference"