implement support for "enum class"

This adds support for the C++11 "enum class" feature.  This is
PR c++/15246.

I chose to use the existing TYPE_DECLARED_CLASS rather than introduce
a new type code.  This seemed both simple and clear to me.

I made overloading support for the new enum types strict.  This is how
it works in C++; and it didn't seem like an undue burden to keep this,
particularly because enum constants are printed symbolically by gdb.

Built and regtested on x86-64 Fedora 20.

2014-04-14  Tom Tromey  <tromey@redhat.com>

	PR c++/15246:
	* c-exp.y (type_aggregate_p): New function.
	(qualified_name, classify_inner_name): Use it.
	* c-typeprint.c (c_type_print_base): Handle TYPE_DECLARED_CLASS
	and TYPE_TARGET_TYPE of an enum type.
	* dwarf2read.c (read_enumeration_type): Set TYPE_DECLARED_CLASS on
	an enum type.
	(determine_prefix) <case DW_TAG_enumeration_type>: New case;
	handle TYPE_DECLARED_CLASS.
	* gdbtypes.c (rank_one_type): Handle TYPE_DECLARED_CLASS on enum
	types.
	* gdbtypes.h (TYPE_DECLARED_CLASS): Update comment.
	* valops.c (enum_constant_from_type): New function.
	(value_aggregate_elt): Use it.
	* cp-namespace.c (cp_lookup_nested_symbol): Handle
	TYPE_CODE_ENUM.

2014-04-14  Tom Tromey  <tromey@redhat.com>

	* gdb.cp/classes.exp (test_enums): Handle underlying type.
	* gdb.dwarf2/enum-type.exp: Add test for enum with underlying
	type.
	* gdb.cp/enum-class.exp: New file.
	* gdb.cp/enum-class.cc: New file.

1 files changed, 11 insertions, 0 deletions

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index cede6b4..6d1b90c 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -13270,6 +13270,8 @@ read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
 	TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
     }
 
+  TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
+
   return set_die_type (die, type, cu);
 }
 
@@ -18673,6 +18675,15 @@ determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
 	      return name;
 	  }
 	return "";
+      case DW_TAG_enumeration_type:
+	parent_type = read_type_die (parent, cu);
+	if (TYPE_DECLARED_CLASS (parent_type))
+	  {
+	    if (TYPE_TAG_NAME (parent_type) != NULL)
+	      return TYPE_TAG_NAME (parent_type);
+	    return "";
+	  }
+	/* Fall through.  */
       default:
 	return determine_prefix (parent, cu);
       }