var-tracking.c (enum micro_operation_type): Add MO_COPY.

* var-tracking.c (enum micro_operation_type): Add MO_COPY.
(var_debug_decl): New function.
(var_reg_set): Follow debug decl link.  Add location even if
reg is already known to hold some other variable.
(var_mem_set): Follow debug decl link.
(var_reg_delete_and_set, var_mem_delete_and_set): Follow debug
decl link.  Delete other known locations of the variable part
if requested.
(var_reg_delete, var_mem_delete): Delete other known locations
of the variable part if requested.
(same_variable_part_p): New function.
(add_stores): Select MO_COPY when appropriate.
(vt_initialize): Handle it.
(compute_bb_dataflow, emit_notes_in_bb): Likewise.  Delete
known locations for MO_SET and MO_CLOBBER.
(find_variable_location_part): New function.
(set_variable_part, delete_variable_part): Use it.
(clobber_variable_part): New function.
* dwarf2out.c (dwarf2out_var_location): Do not follow debug
decl link.

From-SVN: r116031

gcc/ChangeLog

+2006-08-09  Alexandre Oliva  <aoliva@redhat.com>
+
+	* var-tracking.c (enum micro_operation_type): Add MO_COPY.
+	(var_debug_decl): New function.
+	(var_reg_set): Follow debug decl link.  Add location even if
+	reg is already known to hold some other variable.
+	(var_mem_set): Follow debug decl link.
+	(var_reg_delete_and_set, var_mem_delete_and_set): Follow debug
+	decl link.  Delete other known locations of the variable part
+	if requested.
+	(var_reg_delete, var_mem_delete): Delete other known locations
+	of the variable part if requested.
+	(same_variable_part_p): New function.
+	(add_stores): Select MO_COPY when appropriate.
+	(vt_initialize): Handle it.
+	(compute_bb_dataflow, emit_notes_in_bb): Likewise.  Delete
+	known locations for MO_SET and MO_CLOBBER.
+	(find_variable_location_part): New function.
+	(set_variable_part, delete_variable_part): Use it.
+	(clobber_variable_part): New function.
+	* dwarf2out.c (dwarf2out_var_location): Do not follow debug
+	decl link.
+
 2006-08-07  Victor Kaplansky <victork@il.ibm.com>
 
         PR tree-optimization/26969

gcc/dwarf2out.c

@@ -13551,9 +13551,6 @@ dwarf2out_var_location (rtx loc_note)
   last_insn = loc_note;
   last_label = newloc->label;
   decl = NOTE_VAR_LOCATION_DECL (loc_note);
-  if (DECL_DEBUG_EXPR_IS_FROM (decl) && DECL_DEBUG_EXPR (decl) 
-      && DECL_P (DECL_DEBUG_EXPR (decl)))
-    decl = DECL_DEBUG_EXPR (decl); 
   add_var_loc_to_decl (decl, newloc);
 }