[PATCH] Support for DWARF5 location lists entries

["Achra, Nitika" <Nitika.Achra@amd.com>]

[AMD Official Use Only - Internal Distribution Only]



* Handle DW_LLE_base_addressx, DW_LLE_startx_length and DW_LLE_start_length.



Tested by running the testsuite before and after the patch and there is no increase in the number of test cases that fails.

Tested with both -gdwarf-4 and -gdwarf-5 flags.




gdb/ChangeLog:
        *gdb/dwarf2loc.c (decode_debug_loclists_addresses): Handle DW_LLE_base_addressx, DW_LLE_startx_length, DW_LLE_start_length.



diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index 976d453d3c..0de956ab66 100644
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -173,6 +173,41 @@ decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu,
   switch (*loc_ptr++)
     {
+    case DW_LLE_base_addressx:
+       *low = 0;
+       loc_ptr = gdb_read_uleb128(loc_ptr, buf_end, &u64);
+       if (loc_ptr == NULL)
+               return DEBUG_LOC_BUFFER_OVERFLOW;
+       *high = dwarf2_read_addr_index(per_cu, u64);
+       *new_ptr = loc_ptr;
+       return DEBUG_LOC_BASE_ADDRESS;
+    case DW_LLE_startx_length:
+       loc_ptr = gdb_read_uleb128(loc_ptr, buf_end, &u64);
+       if (loc_ptr == NULL)
+          return DEBUG_LOC_BUFFER_OVERFLOW;
+       *low = dwarf2_read_addr_index(per_cu, u64);
+       *high = *low;
+       loc_ptr = gdb_read_uleb128(loc_ptr, buf_end, &u64);
+       if (loc_ptr == NULL)
+               return DEBUG_LOC_BUFFER_OVERFLOW;
+       *high += u64;
+       *new_ptr = loc_ptr;
+       return DEBUG_LOC_START_LENGTH;
+    case DW_LLE_start_length:
+       if (buf_end - loc_ptr < addr_size)
+                return DEBUG_LOC_BUFFER_OVERFLOW;
+       if (signed_addr_p)
+               *low = extract_signed_integer(loc_ptr, addr_size, byte_order);
+       else
+               *low = extract_unsigned_integer(loc_ptr, addr_size, byte_order);
+       loc_ptr += addr_size;
+       *high = *low;
+       loc_ptr = gdb_read_uleb128(loc_ptr, buf_end, &u64);
+       if (loc_ptr == NULL)
+                return DEBUG_LOC_BUFFER_OVERFLOW;
+       *high += u64;
+       *new_ptr = loc_ptr;
+       return DEBUG_LOC_START_LENGTH;
     case DW_LLE_end_of_list:
       *new_ptr = loc_ptr;
       return DEBUG_LOC_END_OF_LIST;
@@ -197,6 +232,9 @@ decode_debug_loclists_addresses (struct dwarf2_per_cu_data *per_cu,
       *high = u64;
       *new_ptr = loc_ptr;
       return DEBUG_LOC_START_END;
+    case DW_LLE_startx_endx:
+    case DW_LLE_start_end:
+    case DW_LLE_default_location:
     default:
       return DEBUG_LOC_INVALID_ENTRY;
     }