DWARF address space for variables

Add DWARF address class attributes for variables that exist outside the
generic address space.  In particular, this is the case for gang-private
variables in OpenACC offload kernels.

gcc/ChangeLog:

	* dwarf2out.cc (add_location_or_const_value_attribute): Set
	DW_AT_address_class, if appropriate.

1 files changed, 9 insertions, 0 deletions

diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc
index 1473f73..8c711e4 100644
--- a/gcc/dwarf2out.cc
+++ b/gcc/dwarf2out.cc
@@ -21030,6 +21030,15 @@ add_location_or_const_value_attribute (dw_die_ref die, tree decl, bool cache_p)
   if (list)
     {
       add_AT_location_description (die, DW_AT_location, list);
+
+      addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
+      if (!ADDR_SPACE_GENERIC_P (as))
+	{
+	  int action = targetm.addr_space.debug (as);
+	  /* Positive values indicate an address_class.  */
+	  if (action >= 0)
+	    add_AT_unsigned (die, DW_AT_address_class, action);
+	}
       return true;
     }
   /* None of that worked, so it must not really have a location;