Add rvalue reference tests and docs

This patch adds tests for the initial rvalue reference support patchset.  All
of the new tests are practically mirrored regular references tests and, except
for the demangler ones, are introduced in new files, which are set to be
compiled with -std=gnu++11.  Tested are printing of rvalue reference types and
values, rvalue reference parameters in function overloading, demangling of
function names containing rvalue reference parameters, casts to rvalue
reference types, application of the sizeof operator to rvalue reference types
and values, and support for rvalue references within the gdb python module.

gdb/ChnageLog

	PR gdb/14441
	* NEWS: Mention support for rvalue references in GDB and python.
	* doc/gdb.texinfo (C Plus Plus Expressions): Mention that GDB
	supports both lvalue and rvalue references.

gdb/testsuite/ChangeLog

	PR gdb/14441
	* gdb.cp/demangle.exp: Add rvalue reference tests.
	* gdb.cp/rvalue-ref-casts.cc: New file.
	* gdb.cp/rvalue-ref-casts.exp: New file.
	* gdb.cp/rvalue-ref-overload.cc: New file.
	* gdb.cp/rvalue-ref-overload.exp: New file.
	* gdb.cp/rvalue-ref-params.cc: New file.
	* gdb.cp/rvalue-ref-params.exp: New file.
	* gdb.cp/rvalue-ref-sizeof.cc: New file.
	* gdb.cp/rvalue-ref-sizeof.exp: New file.
	* gdb.cp/rvalue-ref-types.cc: New file.
	* gdb.cp/rvalue-ref-types.exp: New file.
	* gdb.python/py-rvalue-ref-value-cc.cc: New file.
	* gdb.python/py-rvalue-ref-value-cc.exp: New file.

1 files changed, 69 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.cp/rvalue-ref-params.exp b/gdb/testsuite/gdb.cp/rvalue-ref-params.exp
new file mode 100644
index 00000000000..303b447d242
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/rvalue-ref-params.exp
@@ -0,0 +1,69 @@
+# Copyright 2006-2017 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Tests for rvalue reference parameters of types and their subtypes in GDB,
+# based on gdb.cp/ref-params.exp.
+
+if {[skip_cplus_tests]} { continue }
+
+standard_testfile .cc
+
+if {[prepare_for_testing $testfile.exp $testfile $srcfile \
+    {debug c++ additional_flags="-std=gnu++11"}] == 1} {
+    return -1
+}
+
+proc gdb_start_again {text prefix} {
+    global binfile
+    global srcfile
+
+    with_test_prefix $prefix {
+	clean_restart $binfile
+
+	runto ${srcfile}:[gdb_get_line_number $text]
+    }
+}
+
+set t "print value of f1 on (Child&&) in main"
+gdb_start_again "marker1 here" $t
+gdb_test "print f1(static_cast<Child&&>(Q))" ".* = 40.*" $t
+
+set t "print value of f2 on (Child&&) in main" 
+gdb_start_again "marker1 here" $t
+gdb_test "print f2(static_cast<Child&&>(Q))" ".* = 40.*" $t
+
+set t "print value of Child&& in f2"
+gdb_start_again "marker2 here" $t
+gdb_test "print C" ".*id = 42.*" $t
+
+setup_kfail "c++/15372" "*-*-*"
+gdb_test "print f1 (static_cast<Child&&> (C))" ".* = 42.*" \
+    "print value of f1 on Child&& in f2"
+
+set t "print value of Parent&& in f1"
+gdb_start_again "marker3 here" $t
+gdb_test "print R" ".*id = 41.*" $t
+
+set t "print f1(static_cast<MultiChild&&>(MQ))"
+gdb_start_again "breakpoint MQ here" $t
+gdb_test $t ".* = 53"
+
+set t "print mf1(static_cast<MultiChild&&>(MQ))"
+gdb_start_again "breakpoint MQ here" $t
+gdb_test $t ".* = 106"
+
+set t "print mf2(static_cast<MultiChild&&>(MQ))"
+gdb_start_again "breakpoint MQ here" $t
+gdb_test $t ".* = 106"