[gcc/devel/omp/gcc-10] DWARF address space for variables

[Andrew Stubbs]

https://gcc.gnu.org/g:5dac172b8016998123a4302041361e6f4aed6731

commit 5dac172b8016998123a4302041361e6f4aed6731
Author: Andrew Stubbs <ams@codesourcery.com>
Date:   Fri Jan 15 11:26:46 2021 +0000

    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.c (add_location_or_const_value_attribute): Set
            DW_AT_address_class, if appropriate.

Diff:
---
 gcc/dwarf2out.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index a4a1b934dc7..dedfeaf865f 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -20294,6 +20294,15 @@ 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;