178 lines
5.8 KiB
Text
178 lines
5.8 KiB
Text
# Copyright 2002-2016 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This file is part of the gdb testsuite
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# Test casting, especially between class types or pointer-to-class
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# types.
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# This file is part of the gdb testsuite
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#
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# test running programs
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#
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if { [skip_cplus_tests] } { continue }
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standard_testfile .cc
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if [get_compiler_info "c++"] {
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return -1
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}
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if {[prepare_for_testing $testfile.exp $testfile $srcfile {debug c++}]} {
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return -1
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}
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if ![runto_main] then {
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perror "couldn't run to breakpoint"
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continue
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}
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# Prevent symbol on address 0x0 being printed.
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gdb_test_no_output "set print symbol off"
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gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \
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"Breakpoint.*at.* file .*" \
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""
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gdb_test "continue" "Breakpoint .* at .*casts.cc.*" ""
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# Casting a pointer to a base class to a pointer to a derived class
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# should yield the entire derived class. Until August 2002, GDB got
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# the enclosing type on `(B *) a' wrong: while the value's static type
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# was `B *', as it should be, the enclosing type (which is supposed to
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# be the dynamic type) was `A *'. It's senseless to have a static
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# type derived from the dynamic type; it should be the other way
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# 'round. Dereferencing this oddly typed pointer yielded a value in
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# which only the base class's members were initialized, since GDB uses
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# the enclosing type to decide how many bytes to read. Members from
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# the derived class were garbage, from GDB's address space.
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gdb_test "print * (B *) a" ".* = {<A> = {a = 42}, b = 1729}" \
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"cast base class pointer to derived class pointer"
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# Check also that we get the same results from letting the compiler do
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# the dereference.
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gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \
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"let compiler cast base class pointer to derived class pointer"
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# Check upcasting (it is trivial but still).
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gdb_test "print * (A *) b" ".* = {a = 42}" \
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"cast derived class pointer to base class pointer"
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# Casting References.
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# Check upcasting.
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gdb_test "print (A &) br" ".* = .A &.* {a = 42}" \
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"cast derived class reference to base class reference"
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# Check downcasting.
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gdb_test "print (B &) ar" ".* = .B.* {<A> = {a = 42}, b = 1729}" \
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"cast base class reference to derived class reference"
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# Check compiler casting
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gdb_test "print br" ".* = .B.* {<A> = {a = 42}, b = 1729}" \
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"let compiler cast base class reference to derived class reference"
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# A few basic tests of "new" casts.
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gdb_test "print const_cast<const B *> (b)" " = \\(const B \\*\\) $hex" \
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"basic test of const_cast"
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gdb_test "print const_cast<void *> (0)" " = \\(void \\*\\) 0x0" \
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"const_cast of 0"
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gdb_test "print static_cast<A *> (b)" " = \\(A \\*\\) $hex" \
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"basic test of static_cast"
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gdb_test "print static_cast<A &> (*b)" " = \\(A \\&\\) @$hex: {a = 42}" \
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"static_cast to reference type"
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gdb_test "print reinterpret_cast<A *> (b)" " = \\(A \\*\\) $hex" \
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"basic test of reinterpret_cast"
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gdb_test "print reinterpret_cast<void> (b)" "Invalid reinterpret_cast" \
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"test invalid reinterpret_cast"
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gdb_test "print reinterpret_cast<A &> (*b)" " = \\(A \\&\\) @$hex: {a = 42}" \
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"reinterpret_cast to reference type"
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# Test that keyword shadowing works.
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gdb_test "whatis decltype(5)" " = double"
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# Basic tests using typeof.
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foreach opname {__typeof__ __typeof __decltype} {
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gdb_test "print (${opname}(a)) (b)" " = \\(A \\*\\) $hex" \
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"old-style cast using $opname"
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gdb_test "print static_cast<${opname}(a)> (b)" " = \\(A \\*\\) $hex" \
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"static_cast using $opname"
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gdb_test "print reinterpret_cast<${opname}(a)> (b)" " = \\(A \\*\\) $hex" \
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"reinterpret_cast using $opname"
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}
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gdb_test "whatis __decltype(*a)" "type = A \\&"
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# Tests of dynamic_cast.
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set nonzero_hex "0x\[0-9A-Fa-f\]\[0-9A-Fa-f\]+"
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gdb_test "print dynamic_cast<void> (a)" \
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".*must be a pointer or reference type" \
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"invalid dynamic_cast"
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gdb_test "print dynamic_cast<void *> (0)" \
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" = \\(void \\*\\) 0x0" \
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"dynamic_cast of 0 to void*"
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gdb_test "print dynamic_cast<Alpha *> (&derived)" \
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" = \\(Alpha \\*\\) $nonzero_hex" \
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"dynamic_cast simple upcast"
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gdb_test "print dynamic_cast<Alpha *> (&doublyderived)" \
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" = \\(Alpha \\*\\) $nonzero_hex" \
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"dynamic_cast upcast to unique base"
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gdb_test "print dynamic_cast<Alpha &> (derived)" \
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" = \\(Alpha \\&\\) @$nonzero_hex: {.* = ${nonzero_hex}( <vtable for Derived.*>)?}" \
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"dynamic_cast simple upcast to reference"
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gdb_test "print dynamic_cast<Derived *> (ad)" \
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" = \\(Derived \\*\\) ${nonzero_hex}( <vtable for Derived.*>)?" \
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"dynamic_cast simple downcast"
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gdb_test "print dynamic_cast<VirtuallyDerived *> (add)" \
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" = \\(VirtuallyDerived \\*\\) $nonzero_hex" \
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"dynamic_cast simple downcast to intermediate class"
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gdb_test "print dynamic_cast<VirtuallyDerived *> (ad)" \
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" = \\(VirtuallyDerived \\*\\) 0x0" \
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"dynamic_cast to non-existing base"
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gdb_test "print dynamic_cast<VirtuallyDerived &> (*ad)" \
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"dynamic_cast failed" \
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"dynamic_cast to reference to non-existing base"
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gdb_test "print dynamic_cast<DoublyDerived *> (add)" \
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" = \\(DoublyDerived \\*\\) ${nonzero_hex}( <vtable for DoublyDerived.*>)?" \
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"dynamic_cast unique downcast"
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gdb_test "print dynamic_cast<Gamma *> (add)" \
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" = \\(Gamma \\*\\) $nonzero_hex" \
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"dynamic_cast to sibling"
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