[PATCH v4 01/11] [PR gdb/14441] gdb: gdbtypes: add definitions for rvalue reference type

[Artemiy Volkov <artemiyv@acm.org>]

This patch introduces preliminal definitions regarding C++0x 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_IS_REFERENCE
convenience macro used to check for both kinds of references simultaneously as
they are equivalent in many contexts.

gdb/Changelog:

2016-03-21  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/gdbtypes.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index 1518a7a..6842052 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
@@ -362,6 +364,11 @@ 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).
@@ -767,6 +774,10 @@ struct type
 
   struct type *reference_type;
 
+  /* * A C++ rvalue reference type added in C++0x. */
+
+  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
@@ -1229,6 +1240,7 @@ 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,
-- 
2.7.3