| 1 | # Copyright 2002-2016 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 | |
| 28 | if { [skip_cplus_tests] } { continue } |
| 29 | |
| 30 | standard_testfile .cc |
| 31 | |
| 32 | if [get_compiler_info "c++"] { |
| 33 | return -1 |
| 34 | } |
| 35 | |
| 36 | if {[prepare_for_testing $testfile.exp $testfile $srcfile {debug c++}]} { |
| 37 | return -1 |
| 38 | } |
| 39 | |
| 40 | if ![runto_main] then { |
| 41 | perror "couldn't run to breakpoint" |
| 42 | continue |
| 43 | } |
| 44 | |
| 45 | # Prevent symbol on address 0x0 being printed. |
| 46 | gdb_test_no_output "set print symbol off" |
| 47 | |
| 48 | gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \ |
| 49 | "Breakpoint.*at.* file .*" \ |
| 50 | "" |
| 51 | |
| 52 | gdb_test "continue" "Breakpoint .* at .*casts.cc.*" "" |
| 53 | |
| 54 | # Casting a pointer to a base class to a pointer to a derived class |
| 55 | # should yield the entire derived class. Until August 2002, GDB got |
| 56 | # the enclosing type on `(B *) a' wrong: while the value's static type |
| 57 | # was `B *', as it should be, the enclosing type (which is supposed to |
| 58 | # be the dynamic type) was `A *'. It's senseless to have a static |
| 59 | # type derived from the dynamic type; it should be the other way |
| 60 | # 'round. Dereferencing this oddly typed pointer yielded a value in |
| 61 | # which only the base class's members were initialized, since GDB uses |
| 62 | # the enclosing type to decide how many bytes to read. Members from |
| 63 | # the derived class were garbage, from GDB's address space. |
| 64 | gdb_test "print * (B *) a" ".* = {<A> = {a = 42}, b = 1729}" \ |
| 65 | "cast base class pointer to derived class pointer" |
| 66 | |
| 67 | # Check also that we get the same results from letting the compiler do |
| 68 | # the dereference. |
| 69 | gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \ |
| 70 | "let compiler cast base class pointer to derived class pointer" |
| 71 | |
| 72 | # Check upcasting (it is trivial but still). |
| 73 | gdb_test "print * (A *) b" ".* = {a = 42}" \ |
| 74 | "cast derived class pointer to base class pointer" |
| 75 | |
| 76 | # Casting References. |
| 77 | # Check upcasting. |
| 78 | gdb_test "print (A &) br" ".* = .A &.* {a = 42}" \ |
| 79 | "cast derived class reference to base class reference" |
| 80 | |
| 81 | # Check downcasting. |
| 82 | gdb_test "print (B &) ar" ".* = .B.* {<A> = {a = 42}, b = 1729}" \ |
| 83 | "cast base class reference to derived class reference" |
| 84 | |
| 85 | # Check compiler casting |
| 86 | gdb_test "print br" ".* = .B.* {<A> = {a = 42}, b = 1729}" \ |
| 87 | "let compiler cast base class reference to derived class reference" |
| 88 | |
| 89 | |
| 90 | # A few basic tests of "new" casts. |
| 91 | |
| 92 | gdb_test "print const_cast<const B *> (b)" " = \\(const B \\*\\) $hex" \ |
| 93 | "basic test of const_cast" |
| 94 | |
| 95 | gdb_test "print const_cast<void *> (0)" " = \\(void \\*\\) 0x0" \ |
| 96 | "const_cast of 0" |
| 97 | |
| 98 | gdb_test "print static_cast<A *> (b)" " = \\(A \\*\\) $hex" \ |
| 99 | "basic test of static_cast" |
| 100 | |
| 101 | gdb_test "print static_cast<A &> (*b)" " = \\(A \\&\\) @$hex: {a = 42}" \ |
| 102 | "static_cast to reference type" |
| 103 | |
| 104 | gdb_test "print reinterpret_cast<A *> (b)" " = \\(A \\*\\) $hex" \ |
| 105 | "basic test of reinterpret_cast" |
| 106 | |
| 107 | gdb_test "print reinterpret_cast<void> (b)" "Invalid reinterpret_cast" \ |
| 108 | "test invalid reinterpret_cast" |
| 109 | |
| 110 | gdb_test "print reinterpret_cast<A &> (*b)" " = \\(A \\&\\) @$hex: {a = 42}" \ |
| 111 | "reinterpret_cast to reference type" |
| 112 | |
| 113 | # Test that keyword shadowing works. |
| 114 | |
| 115 | gdb_test "whatis decltype(5)" " = double" |
| 116 | |
| 117 | # Basic tests using typeof. |
| 118 | |
| 119 | foreach opname {__typeof__ __typeof __decltype} { |
| 120 | gdb_test "print (${opname}(a)) (b)" " = \\(A \\*\\) $hex" \ |
| 121 | "old-style cast using $opname" |
| 122 | |
| 123 | gdb_test "print static_cast<${opname}(a)> (b)" " = \\(A \\*\\) $hex" \ |
| 124 | "static_cast using $opname" |
| 125 | |
| 126 | gdb_test "print reinterpret_cast<${opname}(a)> (b)" " = \\(A \\*\\) $hex" \ |
| 127 | "reinterpret_cast using $opname" |
| 128 | } |
| 129 | |
| 130 | gdb_test "whatis __decltype(*a)" "type = A \\&" |
| 131 | |
| 132 | # Tests of dynamic_cast. |
| 133 | |
| 134 | set nonzero_hex "0x\[0-9A-Fa-f\]\[0-9A-Fa-f\]+" |
| 135 | |
| 136 | gdb_test "print dynamic_cast<void> (a)" \ |
| 137 | ".*must be a pointer or reference type" \ |
| 138 | "invalid dynamic_cast" |
| 139 | |
| 140 | gdb_test "print dynamic_cast<void *> (0)" \ |
| 141 | " = \\(void \\*\\) 0x0" \ |
| 142 | "dynamic_cast of 0 to void*" |
| 143 | |
| 144 | gdb_test "print dynamic_cast<Alpha *> (&derived)" \ |
| 145 | " = \\(Alpha \\*\\) $nonzero_hex" \ |
| 146 | "dynamic_cast simple upcast" |
| 147 | |
| 148 | gdb_test "print dynamic_cast<Alpha *> (&doublyderived)" \ |
| 149 | " = \\(Alpha \\*\\) $nonzero_hex" \ |
| 150 | "dynamic_cast upcast to unique base" |
| 151 | |
| 152 | gdb_test "print dynamic_cast<Alpha &> (derived)" \ |
| 153 | " = \\(Alpha \\&\\) @$nonzero_hex: {.* = ${nonzero_hex}( <vtable for Derived.*>)?}" \ |
| 154 | "dynamic_cast simple upcast to reference" |
| 155 | |
| 156 | gdb_test "print dynamic_cast<Derived *> (ad)" \ |
| 157 | " = \\(Derived \\*\\) ${nonzero_hex}( <vtable for Derived.*>)?" \ |
| 158 | "dynamic_cast simple downcast" |
| 159 | |
| 160 | gdb_test "print dynamic_cast<VirtuallyDerived *> (add)" \ |
| 161 | " = \\(VirtuallyDerived \\*\\) $nonzero_hex" \ |
| 162 | "dynamic_cast simple downcast to intermediate class" |
| 163 | |
| 164 | gdb_test "print dynamic_cast<VirtuallyDerived *> (ad)" \ |
| 165 | " = \\(VirtuallyDerived \\*\\) 0x0" \ |
| 166 | "dynamic_cast to non-existing base" |
| 167 | |
| 168 | gdb_test "print dynamic_cast<VirtuallyDerived &> (*ad)" \ |
| 169 | "dynamic_cast failed" \ |
| 170 | "dynamic_cast to reference to non-existing base" |
| 171 | |
| 172 | gdb_test "print dynamic_cast<DoublyDerived *> (add)" \ |
| 173 | " = \\(DoublyDerived \\*\\) ${nonzero_hex}( <vtable for DoublyDerived.*>)?" \ |
| 174 | "dynamic_cast unique downcast" |
| 175 | |
| 176 | gdb_test "print dynamic_cast<Gamma *> (add)" \ |
| 177 | " = \\(Gamma \\*\\) $nonzero_hex" \ |
| 178 | "dynamic_cast to sibling" |