99 lines
3.2 KiB
Text
99 lines
3.2 KiB
Text
# Copyright 2002, 2003, 2004, 2007, 2008 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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