--- a/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/Utils.java	Tue Aug 27 18:11:35 2013 +0200
+++ b/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/Utils.java	Tue Aug 27 22:08:26 2013 +0200
@@ -32,7 +32,7 @@
 import javax.lang.model.util.*;
 
 import com.oracle.truffle.dsl.processor.ast.*;
-import com.oracle.truffle.dsl.processor.ast.CodeTypeMirror.*;
+import com.oracle.truffle.dsl.processor.ast.CodeTypeMirror.DeclaredCodeTypeMirror;
 import com.oracle.truffle.dsl.processor.compiler.*;
 
 /**
@@ -50,6 +50,19 @@
         return null;
     }
 
+    public static boolean needsCastTo(ProcessorContext context, TypeMirror sourceType, TypeMirror targetType) {
+        if (typeEquals(sourceType, targetType)) {
+            return false;
+        } else if (isObject(targetType)) {
+            return false;
+        } else if (isVoid(targetType)) {
+            return false;
+        } else if (isAssignable(context, sourceType, targetType)) {
+            return false;
+        }
+        return true;
+    }
+
     public static VariableElement findVariableElement(DeclaredType type, String name) {
         List<? extends VariableElement> elements = ElementFilter.fieldsIn(type.asElement().getEnclosedElements());
         for (VariableElement variableElement : elements) {
@@ -502,6 +515,24 @@
         return types;
     }
 
+    public static List<TypeMirror> getAssignableTypes(ProcessorContext context, TypeMirror type) {
+        if (isPrimitive(type)) {
+            return Arrays.asList(type, boxType(context, type), context.getType(Object.class));
+        } else if (type.getKind() == TypeKind.ARRAY) {
+            return Arrays.asList(type, context.getType(Object.class));
+        } else if (type.getKind() == TypeKind.DECLARED) {
+            List<TypeElement> types = getSuperTypes(fromTypeMirror(type));
+            List<TypeMirror> mirrors = new ArrayList<>(types.size());
+            mirrors.add(type);
+            for (TypeElement typeElement : types) {
+                mirrors.add(typeElement.asType());
+            }
+            return mirrors;
+        } else {
+            return Collections.emptyList();
+        }
+    }
+
     public static List<TypeElement> getSuperTypes(TypeElement element) {
         List<TypeElement> types = new ArrayList<>();
         List<TypeElement> superTypes = null;