1# Copyright 2002-2023 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 3 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, see <http://www.gnu.org/licenses/>.
15
16# This file is part of the gdb testsuite
17
18# Test casting, especially between class types or pointer-to-class
19# types.
20
21# This file is part of the gdb testsuite
22
23#
24# test running programs
25#
26
27
28if { [skip_cplus_tests] } { return }
29
30standard_testfile .cc casts03.cc
31
32if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
33    return -1
34}
35
36if {![runto_main]} {
37    return
38}
39
40# Prevent symbol on address 0x0 being printed.
41gdb_test_no_output "set print symbol off"  \
42    "turn of symbol printing for the first time"
43
44gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \
45    "Breakpoint.*at.* file .*" \
46    ""
47
48gdb_test "continue" "Breakpoint .* at .*casts.cc.*" ""
49
50# Casting a pointer to a base class to a pointer to a derived class
51# should yield the entire derived class.  Until August 2002, GDB got
52# the enclosing type on `(B *) a' wrong: while the value's static type
53# was `B *', as it should be, the enclosing type (which is supposed to
54# be the dynamic type) was `A *'.  It's senseless to have a static
55# type derived from the dynamic type; it should be the other way
56# 'round.  Dereferencing this oddly typed pointer yielded a value in
57# which only the base class's members were initialized, since GDB uses
58# the enclosing type to decide how many bytes to read.  Members from
59# the derived class were garbage, from GDB's address space.
60gdb_test "print * (B *) a" ".* = {<A> = {a = 42}, b = 1729}" \
61    "cast base class pointer to derived class pointer"
62
63# Check also that we get the same results from letting the compiler do
64# the dereference.
65gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \
66    "let compiler cast base class pointer to derived class pointer"
67
68# Check upcasting (it is trivial but still).
69gdb_test "print * (A *) b" ".* = {a = 42}" \
70    "cast derived class pointer to base class pointer"
71
72# Casting References.
73# Check upcasting.
74gdb_test "print (A &) br" ".* = .A &.* {a = 42}" \
75    "cast derived class reference to base class reference"
76
77# Check downcasting.
78gdb_test "print (B &) ar" ".* = .B.* {<A> = {a = 42}, b = 1729}" \
79    "cast base class reference to derived class reference"
80
81# Check compiler casting
82gdb_test "print br" ".* = .B.* {<A> = {a = 42}, b = 1729}" \
83    "let compiler cast base class reference to derived class reference"
84
85
86# A few basic tests of "new" casts.
87
88gdb_test "print const_cast<const B *> (b)" " = \\(const B \\*\\) $hex" \
89    "basic test of const_cast"
90
91gdb_test "print const_cast<void *> (0)" " = \\(void \\*\\) 0x0" \
92    "const_cast of 0"
93
94gdb_test "print static_cast<A *> (b)" " = \\(A \\*\\) $hex" \
95    "basic test of static_cast"
96
97gdb_test "print static_cast<A &> (*b)" " = \\(A \\&\\) @$hex: {a = 42}" \
98    "static_cast to reference type"
99
100gdb_test "print reinterpret_cast<A *> (b)" " = \\(A \\*\\) $hex" \
101    "basic test of reinterpret_cast"
102
103gdb_test "print reinterpret_cast<void> (b)" "Invalid reinterpret_cast" \
104    "test invalid reinterpret_cast"
105
106gdb_test "print reinterpret_cast<A &> (*b)" " = \\(A \\&\\) @$hex: {a = 42}" \
107    "reinterpret_cast to reference type"
108
109# Basic tests using typeof.
110
111foreach opname {__typeof__ __typeof __decltype} {
112    gdb_test "print (${opname}(a)) (b)" " = \\(A \\*\\) $hex" \
113	"old-style cast using $opname"
114
115    gdb_test "print static_cast<${opname}(a)> (b)" " = \\(A \\*\\) $hex" \
116	"static_cast using $opname"
117
118    gdb_test "print reinterpret_cast<${opname}(a)> (b)" " = \\(A \\*\\) $hex" \
119	"reinterpret_cast using $opname"
120}
121
122gdb_test "whatis __decltype(*a)" "type = A \\&"
123
124# Tests of dynamic_cast.
125
126set nonzero_hex "0x\[0-9A-Fa-f\]\[0-9A-Fa-f\]+"
127
128gdb_test "print dynamic_cast<void> (a)" \
129    ".*must be a pointer or reference type" \
130    "invalid dynamic_cast"
131
132gdb_test "print dynamic_cast<void *> (0)" \
133    " = \\(void \\*\\) 0x0" \
134    "dynamic_cast of 0 to void*"
135
136gdb_test "print dynamic_cast<Alpha *> (&derived)" \
137    " = \\(Alpha \\*\\) $nonzero_hex" \
138    "dynamic_cast simple upcast"
139
140gdb_test "print dynamic_cast<Alpha *> (&doublyderived)" \
141    " = \\(Alpha \\*\\) $nonzero_hex" \
142    "dynamic_cast upcast to unique base"
143
144gdb_test "print dynamic_cast<Alpha &> (derived)" \
145    " = \\(Alpha \\&\\) @$nonzero_hex: {.* = ${nonzero_hex}( <vtable for Derived.*>)?}" \
146    "dynamic_cast simple upcast to reference"
147
148gdb_test "print dynamic_cast<Derived *> (ad)" \
149    " = \\(Derived \\*\\) ${nonzero_hex}( <vtable for Derived.*>)?" \
150    "dynamic_cast simple downcast"
151
152gdb_test "print dynamic_cast<VirtuallyDerived *> (add)" \
153    " = \\(VirtuallyDerived \\*\\) $nonzero_hex" \
154    "dynamic_cast simple downcast to intermediate class"
155
156gdb_test "print dynamic_cast<VirtuallyDerived *> (ad)" \
157    " = \\(VirtuallyDerived \\*\\) 0x0" \
158    "dynamic_cast to non-existing base"
159
160gdb_test "print dynamic_cast<VirtuallyDerived &> (*ad)" \
161    "dynamic_cast failed" \
162    "dynamic_cast to reference to non-existing base"
163
164gdb_test "print dynamic_cast<DoublyDerived *> (add)" \
165    " = \\(DoublyDerived \\*\\) ${nonzero_hex}( <vtable for DoublyDerived.*>)?" \
166    "dynamic_cast unique downcast"
167
168gdb_test "print dynamic_cast<Gamma *> (add)" \
169    " = \\(Gamma \\*\\) $nonzero_hex" \
170    "dynamic_cast to sibling"
171
172gdb_test "print (unsigned long long) &gd == gd_value" " = true"
173gdb_test "print (unsigned long long) (LeftRight *) (Right *) &gd == gd_value" \
174    " = true"
175gdb_test "print (unsigned long long) (LeftRight *) (Right *) r_value == gd_value" \
176    " = true"
177
178if {[prepare_for_testing "failed to prepare" ${testfile}03 $srcfile2 \
179			 {debug c++ additional_flags=-std=c++03}]} {
180    return -1
181}
182
183if {![runto_main]} {
184   return
185}
186
187# Prevent symbol on address 0x0 being printed.
188gdb_test_no_output "set print symbol off" \
189    "turn of symbol printing for the second time"
190
191gdb_breakpoint [gdb_get_line_number "casts.exp: 1" $srcfile2]
192gdb_continue_to_breakpoint "end of casts03"
193
194# Test that keyword shadowing works.
195
196gdb_test "whatis decltype(5)" " = double"
197