Hi,

attaching a straightforward support for DW_TAG_interface_type.

Only the fixup_partial_die() presence of DW_TAG_class_type was not copied for
DW_TAG_interface_type as DW_TAG_interface_type should never be anonymous.
	http://gcc.gnu.org/ml/gcc/2007-12/msg00583.html

I hope to later extend it to utilize the new information (and print the
class<->struct<->interface types identified appropriately).

x86_64 GDB testsuite regressions free.


Regards,
Jan

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GCC recently wanted to implement Java DW_TAG_interface_type (it was using
DW_TAG_structure_type for everything):
	http://gcc.gnu.org/ml/gcc-patches/2007-11/msg01659.html

but DW_TAG_interface_type is so far completely unsupported by GDB:
	http://gcc.gnu.org/ml/gcc/2007-12/msg00576.html

Therefore DW_TAG_interface_type has became disabled now upstream:
	http://gcc.gnu.org/ml/gcc/2007-12/msg00626.html

But it would be nice to enable it one day.  GDB currently autodetects the
interface type in java_type_print_derivation_info() according to ff it has
virtual inheritance (I expect it is not ambiguous for Java).


Patch to enable DW_TAG_interface_type production for the current GCC snapshot:

--- gcc/java/lang.c	(revision 131124)
+++ gcc/java/lang.c	(working copy)
@@ -965,9 +965,7 @@ java_classify_record (tree type)
   if (! CLASS_P (type))
     return RECORD_IS_STRUCT;
 
-  /* ??? GDB does not support DW_TAG_interface_type as of December,
-     2007.  Re-enable this at a later time.  */
-  if (0 && CLASS_INTERFACE (TYPE_NAME (type)))
+  if (CLASS_INTERFACE (TYPE_NAME (type)))
     return RECORD_IS_INTERFACE;
 
   return RECORD_IS_CLASS;