Correct documentation of return value.

[libfirm] / ir / opt / opt_frame.c

diff --git a/ir/opt/opt_frame.c b/ir/opt/opt_frame.c
index 9ef1abd..b985540 100644 (file)
--- a/ir/opt/opt_frame.c
+++ b/ir/opt/opt_frame.c
@@ -47,6 +47,8 @@ void opt_frame_irg(ir_graph *irg) {
        if (n <= 0)
                return;
 
+       irp_reserve_resources(irp, IR_RESOURCE_ENTITY_LINK);
+
        /* clear all entity links */
        for (i = n - 1; i >= 0; --i) {
                ent = get_class_member(frame_tp, i);
@@ -62,8 +64,10 @@ void opt_frame_irg(ir_graph *irg) {
                /* mark all used entities */
                foreach_out_edge(frame, edge) {
                        sel = get_edge_src_irn(edge);
-                       ent = get_Sel_entity(sel);
-                       set_entity_link(ent, ent);
+                       if (is_Sel(sel)) {
+                               ent = get_Sel_entity(sel);
+                               set_entity_link(ent, ent);
+                       }
                }
        } else {
                /* use traditionally out edges */
@@ -72,8 +76,10 @@ void opt_frame_irg(ir_graph *irg) {
                /* mark all used entities */
                for (i = get_irn_n_outs(frame) - 1; i >= 0; --i) {
                        sel = get_irn_out(frame, i);
-                       ent = get_Sel_entity(sel);
-                       set_entity_link(ent, ent);
+                       if (is_Sel(sel)) {
+                               ent = get_Sel_entity(sel);
+                               set_entity_link(ent, ent);
+                       }
                }
        }
 
@@ -96,4 +102,5 @@ void opt_frame_irg(ir_graph *irg) {
                /* we changed the frame type, it's layout should be redefined */
                set_type_state(frame_tp, layout_undefined);
        }
+       irp_free_resources(irp, IR_RESOURCE_ENTITY_LINK);
 }