[PATCH v6 01/11] Add definitions for rvalue reference types

[Keith Seitz <keiths@redhat.com>]

This patch introduces preliminal definitions regarding C++11 rvalue references
to the gdb type system. In addition to an enum type_code entry, a field in
struct type and an accessor macro for that which are created similarly to the
lvalue references counterparts, we also introduce a TYPE_REFERENCE convenience
macro used to check for both kinds of references simultaneously as they are
equivalent in many contexts.

There are no changes to this patch from v5.

gdb/Changelog

    PR gdb/14441
    From Artemiy Volkov  <artemiyv@acm.org>
    * gdbtypes.h (enum type_code) <TYPE_CODE_RVALUE_REF>: New constant.
    (TYPE_IS_REFERENCE): New macro.
    (struct type): Add rvalue_reference_type field.
    (TYPE_RVALUE_REFERENCE_TYPE): New macro.
---
 gdb/ChangeLog  |  9 +++++++++
 gdb/gdbtypes.h | 12 ++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index e4c4432..7f2e2e5 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,12 @@
+2017-MM-DD  Keith Seitz  <keiths@redhat.com>
+
+	PR gdb/14441
+	From Artemiy Volkov  <artemiyv@acm.org>
+	* gdbtypes.h (enum type_code) <TYPE_CODE_RVALUE_REF>: New constant.
+	(TYPE_IS_REFERENCE): New macro.
+	(struct type): Add rvalue_reference_type field.
+	(TYPE_RVALUE_REFERENCE_TYPE): New macro.
+
 2017-03-10  Keith Seitz  <keiths@redhat.com>
 
 	PR c++/8218
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index e094ece..7d107fa 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -160,6 +160,8 @@ enum type_code
 
     TYPE_CODE_REF,		/**< C++ Reference types */
 
+    TYPE_CODE_RVALUE_REF,	/**< C++ rvalue reference types */
+
     TYPE_CODE_CHAR,		/**< *real* character type */
 
     /* * Boolean type.  0 is false, 1 is true, and other values are
@@ -335,6 +337,11 @@ enum type_instance_flag_value
 #define TYPE_ATOMIC(t) \
   (TYPE_INSTANCE_FLAGS (t) & TYPE_INSTANCE_FLAG_ATOMIC)
 
+/* * True if this type represents either an lvalue or lvalue reference type.  */
+
+#define TYPE_IS_REFERENCE(t) \
+  (TYPE_CODE (t) == TYPE_CODE_REF || TYPE_CODE (t) == TYPE_CODE_RVALUE_REF)
+
 /* * Instruction-space delimited type.  This is for Harvard architectures
    which have separate instruction and data address spaces (and perhaps
    others).
@@ -740,6 +747,10 @@ struct type
 
   struct type *reference_type;
 
+  /* * A C++ rvalue reference type added in C++11. */
+
+  struct type *rvalue_reference_type;
+
   /* * Variant chain.  This points to a type that differs from this
      one only in qualifiers and length.  Currently, the possible
      qualifiers are const, volatile, code-space, data-space, and
@@ -1196,6 +1207,7 @@ extern void allocate_gnat_aux_type (struct type *);
 #define TYPE_TARGET_TYPE(thistype) TYPE_MAIN_TYPE(thistype)->target_type
 #define TYPE_POINTER_TYPE(thistype) (thistype)->pointer_type
 #define TYPE_REFERENCE_TYPE(thistype) (thistype)->reference_type
+#define TYPE_RVALUE_REFERENCE_TYPE(thistype) (thistype)->rvalue_reference_type
 #define TYPE_CHAIN(thistype) (thistype)->chain
 /* * Note that if thistype is a TYPEDEF type, you have to call check_typedef.
    But check_typedef does set the TYPE_LENGTH of the TYPEDEF type,
-- 
2.1.0