Enable chained function calls in C++ expressions.

gdb/ChangeLog:

	* eval.c: Include gdbthread.h.
	(evaluate_subexp): Enable thread stack temporaries before
	evaluating a complete expression and clean them up after the
	evaluation is complete.
	* gdbthread.h: Include common/vec.h.
	(value_ptr): New typedef.
	(VEC (value_ptr)): New vector type.
	(value_vec): New typedef.
	(struct thread_info): Add new fields stack_temporaries_enabled
	and stack_temporaries.
	(enable_thread_stack_temporaries)
	(thread_stack_temporaries_enabled_p, push_thread_stack_temporary)
	(get_last_thread_stack_temporary)
	(value_in_thread_stack_temporaries): Declare.
	* gdbtypes.c (class_or_union_p): New function.
	* gdbtypes.h (class_or_union_p): Declare.
	* infcall.c (call_function_by_hand): Store return values of class
	type as	temporaries on stack.
	* thread.c (enable_thread_stack_temporaries): New function.
	(thread_stack_temporaries_enabled_p, push_thread_stack_temporary)
	(get_last_thread_stack_temporary): Likewise.
	(value_in_thread_stack_temporaries): Likewise.
	* value.c (value_force_lval): New function.
	* value.h (value_force_lval): Declare.

gdb/testsuite/ChangeLog:

	* gdb.cp/chained-calls.cc: New file.
	* gdb.cp/chained-calls.exp: New file.
	* gdb.cp/smartp.exp: Remove KFAIL for "p c2->inta".

1 files changed, 203 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.cp/chained-calls.cc b/gdb/testsuite/gdb.cp/chained-calls.cc
new file mode 100644
index 0000000..a30ec3b
--- /dev/null
+++ b/gdb/testsuite/gdb.cp/chained-calls.cc
@@ -0,0 +1,203 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2014 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/>.  */
+
+class S
+{
+public:
+  S () { }
+  S (S &obj);
+
+  S operator+ (const S &s);
+
+  int a;
+};
+
+S::S (S &obj)
+{
+  a = obj.a;
+}
+
+S
+S::operator+ (const S &s)
+{
+  S res;
+
+  res.a = a + s.a;
+
+  return res;
+}
+
+S
+f (int i)
+{
+  S s;
+
+  s.a = i;
+
+  return s;
+}
+
+int
+g (const S &s)
+{
+  return s.a;
+}
+
+class A
+{
+public:
+  A operator+ (const A &);
+  int a;
+};
+
+A
+A::operator+ (const A &obj)
+{
+  A n;
+
+  n.a = a + obj.a;
+
+  return n;
+}
+
+A
+p ()
+{
+  A a;
+  a.a = 12345678;
+  return a;
+}
+
+A
+r ()
+{
+  A a;
+  a.a = 10000000;
+  return a;
+}
+
+A
+q (const A &a)
+{
+  return a;
+}
+
+class B
+{
+public:
+  int b[1024];
+};
+
+B
+makeb ()
+{
+  B b;
+  int i;
+
+  for (i = 0; i < 1024; i++)
+    b.b[i] = i;
+
+  return b;
+}
+
+int
+getb (const B &b, int i)
+{
+  return b.b[i];
+}
+
+class C
+{
+public:
+  C ();
+  ~C ();
+
+  A operator* ();
+
+  A *a_ptr;
+};
+
+C::C ()
+{
+  a_ptr = new A;
+  a_ptr->a = 5678;
+}
+
+C::~C ()
+{
+  delete a_ptr;
+}
+
+A
+C::operator* ()
+{
+  return *a_ptr;
+}
+
+#define TYPE_INDEX 1
+
+enum type
+{
+  INT,
+  CHAR
+};
+
+union U
+{
+public:
+  U (type t);
+  type get_type ();
+
+  int a;
+  char c;
+  type tp[2];
+};
+
+U::U (type t)
+{
+  tp[TYPE_INDEX] = t;
+}
+
+U
+make_int ()
+{
+  return U (INT);
+}
+
+U
+make_char ()
+{
+  return U (CHAR);
+}
+
+type
+U::get_type ()
+{
+  return tp[TYPE_INDEX];
+}
+
+int
+main ()
+{
+  int i = g(f(0));
+  A a = q(p() + r());
+
+  B b = makeb ();
+  C c;
+
+  return i + getb(b, 0);  /* Break here  */
+}