dwarf2out.c (new_die): Use xcalloc.

        * dwarf2out.c (new_die): Use xcalloc.
        (output_die): Abort rather than emit a local reference to offset 0.

From-SVN: r39201

gcc/ChangeLog

+2001-01-23  Jason Merrill  <jason@redhat.com>
+
+	* dwarf2out.c (new_die): Use xcalloc.
+	(output_die): Abort rather than emit a local reference to offset 0.
+
 2001-01-17  Andrew Haley  <aph@redhat.com>
 
 	* libgcc2.c (get_reg_addr): Don't abort if we haven't got a copy

gcc/dwarf2out.c

@@ -4817,16 +4817,9 @@ new_die (tag_value, parent_die)
      register enum dwarf_tag tag_value;
      register dw_die_ref parent_die;
 {
-  register dw_die_ref die = (dw_die_ref) xmalloc (sizeof (die_node));
+  register dw_die_ref die = (dw_die_ref) xcalloc (1, sizeof (die_node));
 
   die->die_tag = tag_value;
-  die->die_abbrev = 0;
-  die->die_offset = 0;
-  die->die_child = NULL;
-  die->die_parent = NULL;
-  die->die_sib = NULL;
-  die->die_attr = NULL;
-  die->die_symbol = NULL;
 
   if (parent_die != NULL)
     add_child_die (parent_die, die);
@@ -6060,6 +6053,8 @@ output_die (die)
 	case dw_val_class_die_ref:
 	  if (AT_ref_external (a))
 	    output_symbolic_ref (AT_ref (a));
+	  else if (AT_ref (a)->die_offset == 0)
+	    abort ();
 	  else
 	    ASM_OUTPUT_DWARF_DATA (asm_out_file, AT_ref (a)->die_offset);
 	  break;