4e8f195d9d
PR c++/9680: * c-exp.y (REINTERPRET_CAST, DYNAMIC_CAST, STATIC_CAST) (CONST_CAST): New tokens. (exp): Add new productions. (ident_tokens): Add const_cast, dynamic_cast, static_cast, and reinterpret_cast. (is_cast_operator): New function. (yylex): Handle cast operators specially. * eval.c (evaluate_subexp_standard) <UNOP_DYNAMIC_CAST, UNOP_REINTERPRET_CAST>: New cases. * expprint.c (print_subexp_standard): Likewise. (op_name_standard): Likewise. (dump_subexp_body_standard): Likewise. * parse.c (operator_length_standard): Likewise. * expression.h (enum exp_opcode): New constants UNOP_DYNAMIC_CAST, UNOP_REINTERPRET_CAST. * gdbtypes.c (class_types_same_p): New function. (is_ancestor): Use it. (is_public_ancestor): New function. (is_unique_ancestor_worker): Likewise. (is_unique_ancestor): Likewise. * gdbtypes.h (class_types_same_p, is_public_ancestor) (is_unique_ancestor): Declare. * valops.c (value_reinterpret_cast): New function. (dynamic_cast_check_1): Likewise. (dynamic_cast_check_2): Likewise. (value_dynamic_cast): Likewise. * value.h (value_reinterpret_cast, value_dynamic_cast): Declare. gdb/testsuite PR c++/9680: * gdb.cp/casts.cc: Add new classes and variables. * gdb.cp/casts.exp: Test new operators.
172 lines
5.5 KiB
Text
172 lines
5.5 KiB
Text
# Copyright 2002, 2003, 2004, 2007, 2008, 2009, 2010
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# 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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if $tracelevel then {
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strace $tracelevel
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}
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#
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# test running programs
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#
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set prms_id 0
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set bug_id 0
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if { [skip_cplus_tests] } { continue }
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set testfile "casts"
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set srcfile ${testfile}.cc
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set binfile ${objdir}/${subdir}/${testfile}
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if [get_compiler_info ${binfile} "c++"] {
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return -1;
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}
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if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
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untested casts.exp
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return -1
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}
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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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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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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# 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}" \
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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" \
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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" \
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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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