tree-ssa-live.c (remove_unused_locals): Do not remove heap variables.

2009-07-02  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-live.c (remove_unused_locals): Do not remove
	heap variables.
	* tree-ssa-structalias.c (handle_lhs_call): Delay setting
	of DECL_EXTERNAL for HEAP variables.
	(compute_points_to_sets): Set DECL_EXTERNAL for escaped
	HEAP variables.  Do not adjust RESTRICT vars.
	(find_what_var_points_to): Nobody cares if something
	points to READONLY.

From-SVN: r149170

gcc/ChangeLog

+2009-07-02  Richard Guenther  <rguenther@suse.de>
+
+	* tree-ssa-live.c (remove_unused_locals): Do not remove
+	heap variables.
+	* tree-ssa-structalias.c (handle_lhs_call): Delay setting
+	of DECL_EXTERNAL for HEAP variables.
+	(compute_points_to_sets): Set DECL_EXTERNAL for escaped
+	HEAP variables.  Do not adjust RESTRICT vars.
+	(find_what_var_points_to): Nobody cares if something
+	points to READONLY.
+
 2009-07-02  Ben Elliston  <bje@au.ibm.com>
 
 	* unwind-dw2-fde-glibc.c (_Unwind_IteratePhdrCallback): Move

gcc/tree-ssa-live.c

@@ -795,6 +795,7 @@ remove_unused_locals (void)
 	&& TREE_CODE (t) != PARM_DECL
 	&& TREE_CODE (t) != RESULT_DECL
 	&& !(ann = var_ann (t))->used
+	&& !ann->is_heapvar
 	&& !TREE_ADDRESSABLE (t))
       remove_referenced_var (t);
   remove_unused_scope_block_p (DECL_INITIAL (current_function_decl));

gcc/tree-ssa-structalias.c

@@ -3475,6 +3475,7 @@ handle_lhs_call (tree lhs, int flags, VEC(ce_s, heap) *rhsc)
       vi = make_constraint_from_heapvar (get_vi_for_tree (lhs), "HEAP");
       /* We delay marking allocated storage global until we know if
          it escapes.  */
+      DECL_EXTERNAL (vi->decl) = 0;
       vi->is_global_var = 0;
     }
   else if (VEC_length (ce_s, rhsc) > 0)
@@ -4785,8 +4786,10 @@ find_what_var_points_to (varinfo_t vi, struct pt_solution *pt)
 	  else if (vi->is_heap_var)
 	    /* We represent heapvars in the points-to set properly.  */
 	    ;
+	  else if (vi->id == readonly_id)
+	    /* Nobody cares.  */
+	    ;
 	  else if (vi->id == anything_id
-		   || vi->id == readonly_id
 		   || vi->id == integer_id)
 	    pt->anything = 1;
 	}
@@ -5460,9 +5463,10 @@ compute_points_to_sets (void)
   /* Mark escaped HEAP variables as global.  */
   for (i = 0; VEC_iterate (varinfo_t, varmap, i, vi); ++i)
     if (vi->is_heap_var
+	&& !vi->is_restrict_var
 	&& !vi->is_global_var)
-      vi->is_global_var = pt_solution_includes (&cfun->gimple_df->escaped,
-						vi->decl);
+      DECL_EXTERNAL (vi->decl) = vi->is_global_var
+	= pt_solution_includes (&cfun->gimple_df->escaped, vi->decl);
 
   /* Compute the points-to sets for pointer SSA_NAMEs.  */
   for (i = 0; i < num_ssa_names; ++i)