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1 | # Copyright 2002, 2003, 2004, 2007, 2008, 2009, 2010 |
2 | # Free Software Foundation, Inc. | |
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3 | |
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 | |
e22f8b7c | 6 | # the Free Software Foundation; either version 3 of the License, or |
10abb1d4 | 7 | # (at your option) any later version. |
e22f8b7c | 8 | # |
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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. | |
e22f8b7c | 13 | # |
10abb1d4 | 14 | # You should have received a copy of the GNU General Public License |
e22f8b7c | 15 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
10abb1d4 | 16 | |
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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 | ||
24 | if $tracelevel then { | |
25 | strace $tracelevel | |
26 | } | |
27 | ||
28 | # | |
29 | # test running programs | |
30 | # | |
31 | ||
32 | set prms_id 0 | |
33 | set bug_id 0 | |
34 | ||
35 | if { [skip_cplus_tests] } { continue } | |
36 | ||
37 | set testfile "casts" | |
38 | set srcfile ${testfile}.cc | |
39 | set binfile ${objdir}/${subdir}/${testfile} | |
40 | ||
41 | if [get_compiler_info ${binfile} "c++"] { | |
42 | return -1; | |
43 | } | |
44 | ||
45 | if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } { | |
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46 | untested casts.exp |
47 | return -1 | |
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48 | } |
49 | ||
50 | ||
51 | gdb_exit | |
52 | gdb_start | |
53 | gdb_reinitialize_dir $srcdir/$subdir | |
54 | gdb_load ${binfile} | |
55 | ||
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56 | if ![runto_main] then { |
57 | perror "couldn't run to breakpoint" | |
58 | continue | |
59 | } | |
60 | ||
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61 | gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \ |
62 | "Breakpoint.*at.* file .*" \ | |
63 | "" | |
64 | ||
6eac95e3 | 65 | gdb_test "continue" "Breakpoint .* at .*casts.cc.*" "" |
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66 | |
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" | |
79 | ||
80 | # Check also that we get the same results from letting the compiler do | |
81 | # the dereference. | |
82 | gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \ | |
83 | "let compiler cast base class pointer to derived class pointer" | |
f0050c20 AR |
84 | |
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" | |
88 | ||
89 | # Casting References. | |
90 | # Check upcasting. | |
91 | gdb_test "print (A &) br" ".* = .A &.* {a = 42}" \ | |
92 | "cast derived class reference to base class reference" | |
93 | ||
94 | # Check downcasting. | |
95 | gdb_test "print (B &) ar" ".* = .B.* {<A> = {a = 42}, b = 1729}" \ | |
96 | "cast base class reference to derived class reference" | |
97 | ||
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" |