cast access routines

[r5218]

ir/ir/irnode.c

@@ -1357,6 +1357,52 @@ set_Cast_type (ir_node *node, type *to_tp) {
   node->attr.cast.totype = to_tp;
 }
 
+
+/* Checks for upcast.
+ *
+ * Returns true if the Cast node casts a class type to a super type.
+ */
+int is_Cast_upcast(ir_node *node) {
+  type *totype   = get_Cast_type(node);
+  type *fromtype = get_irn_typeinfo_type(get_Cast_op(node));
+  ir_graph *myirg = get_irn_irg(node);
+
+  assert(get_irg_typeinfo_state(myirg) == ir_typeinfo_consistent);
+  assert(fromtype);
+
+  while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
+    totype   = get_pointer_points_to_type(totype);
+    fromtype = get_pointer_points_to_type(fromtype);
+  }
+
+  assert(fromtype);
+
+  if (!is_Class_type(totype)) return false;
+  return is_subclass_of(fromtype, totype);
+}
+
+/* Checks for downcast.
+ *
+ * Returns true if the Cast node casts a class type to a sub type.
+ */
+int is_Cast_downcast(ir_node *node) {
+  type *totype   = get_Cast_type(node);
+  type *fromtype = get_irn_typeinfo_type(get_Cast_op(node));
+
+  assert(get_irg_typeinfo_state(get_irn_irg(node)) == ir_typeinfo_consistent);
+  assert(fromtype);
+
+  while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
+    totype   = get_pointer_points_to_type(totype);
+    fromtype = get_pointer_points_to_type(fromtype);
+  }
+
+  assert(fromtype);
+
+  if (!is_Class_type(totype)) return false;
+  return is_subclass_of(totype, fromtype);
+}
+
 int
 (is_unop)(const ir_node *node) {
   return _is_unop(node);

ir/ir/irnode.h

@@ -246,6 +246,9 @@ ir_node  *get_Block_cfgpred (ir_node *node, int pos);
 void      set_Block_cfgpred (ir_node *node, int pos, ir_node *pred);
 bool      get_Block_matured (ir_node *node);
 void      set_Block_matured (ir_node *node, bool matured);
+
+/** A visited flag only for block nodes.
+ *  @see also: get_irn_visited() inc_irg_visited() inc_irg_block_visited()*/
 unsigned long get_Block_block_visited (ir_node *node);
 void      set_Block_block_visited (ir_node *node, unsigned long visit);
 ir_node  *set_Block_dead(ir_node *block);
@@ -701,6 +704,21 @@ void     set_Cast_op (ir_node *node, ir_node *op);
 type    *get_Cast_type (ir_node *node);
 void     set_Cast_type (ir_node *node, type *to_tp);
 
+/** Checks for upcast.
+ *
+ * Returns true if the Cast node casts a class type to a super type.
+ * Works also for pointers to classes (recursively).
+ */
+int is_Cast_upcast(ir_node *node);
+
+/** Checks for downcast.
+ *
+ * Returns true if the Cast node casts a class type to a sub type.
+ * Works also for pointers to classes (recursively).
+ */
+int is_Cast_downcast(ir_node *node);
+
+
 /** Returns true if n is Phi or Filter in interprocedural_view.
    Returns false if irg in phase building and the Phi has zero
    predecessors: it's a Phi0. */