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, 75 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.cp/rvalue-ref-casts.cc b/gdb/testsuite/gdb.cp/rvalue-ref-casts.cc
new file mode 100644
index 0000000..1f81fe0
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/rvalue-ref-casts.cc
@@ -0,0 +1,75 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2002-2017 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/>.  */
+
+/* Rvalue references casting tests, based on casts.cc.  */
+
+#include <utility>
+
+struct A
+{
+  int a;
+  A (int aa): a (aa) {}
+};
+
+struct B: public A
+{
+  int b;
+  B (int aa, int bb): A (aa), b (bb) {}
+};
+
+
+struct Alpha
+{
+  virtual void x () { }
+};
+
+struct Gamma
+{
+};
+
+struct Derived : public Alpha
+{
+};
+
+struct VirtuallyDerived : public virtual Alpha
+{
+};
+
+struct DoublyDerived : public VirtuallyDerived,
+		       public virtual Alpha,
+		       public Gamma
+{
+};
+
+int
+main (int argc, char **argv)
+{
+  A *a = new B (42, 1729);
+  B *b = (B *) a;
+  A &ar = *b;
+  B &br = (B&)ar;
+  A &&arr = std::move (A (42));
+  B &&brr = std::move (B (42, 1729));
+
+  Derived derived;
+  DoublyDerived doublyderived;
+
+  Alpha *ad = &derived;
+  Alpha *add = &doublyderived;
+
+  return 0;  /* breakpoint spot: rvalue-ref-casts.exp: 1 */
+}