--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/generator/NodeCodeGenerator.java	Mon Aug 11 15:57:14 2014 +0200
@@ -0,0 +1,2935 @@
+/*
+ * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.dsl.processor.generator;
+
+import static com.oracle.truffle.dsl.processor.java.ElementUtils.*;
+import static javax.lang.model.element.Modifier.*;
+
+import java.util.*;
+
+import javax.lang.model.element.*;
+import javax.lang.model.type.*;
+import javax.lang.model.util.*;
+
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.dsl.processor.*;
+import com.oracle.truffle.dsl.processor.java.*;
+import com.oracle.truffle.dsl.processor.java.model.*;
+import com.oracle.truffle.dsl.processor.java.model.CodeTypeMirror.ArrayCodeTypeMirror;
+import com.oracle.truffle.dsl.processor.model.*;
+import com.oracle.truffle.dsl.processor.model.NodeChildData.Cardinality;
+import com.oracle.truffle.dsl.processor.parser.*;
+import com.oracle.truffle.dsl.processor.parser.SpecializationGroup.TypeGuard;
+
+public class NodeCodeGenerator extends AbstractCompilationUnitFactory<NodeData> {
+
+    private static final String THIS_NODE_LOCAL_VAR_NAME = "thisNode";
+
+    private static final String EXECUTE_CHAINED = "executeChained0";
+    private static final String SPECIALIZE = "specialize0";
+    private static final String DSLSHARE_REWRITE = "rewrite";
+    private static final String DSLSHARE_FIND_ROOT = "findRoot";
+    private static final String DSLSHARE_REWRITE_TO_POLYMORHPIC = "rewriteToPolymorphic";
+    private static final String EXECUTE_UNINITIALIZED = "executeUninitialized0";
+    private static final String REWRITE = "rewrite0";
+    private static final String CREATE_INFO = "createInfo0";
+    private static final String CONTAINS_FALLBACK = "containsFallback";
+
+    private static final String FACTORY_METHOD_NAME = "create0";
+    private static final String EMPTY_CLASS_ARRAY = "EMPTY_CLASS_ARRAY";
+
+    private static final String METADATA_FIELD_NAME = "METADATA";
+
+    private TypeMirror getUnexpectedValueException() {
+        return getContext().getTruffleTypes().getUnexpectedValueException();
+    }
+
+    private static String factoryClassName(NodeData node) {
+        return node.getNodeId() + "Factory";
+    }
+
+    private static String nodeSpecializationClassName(SpecializationData specialization) {
+        String nodeid = resolveNodeId(specialization.getNode());
+        String name = ElementUtils.firstLetterUpperCase(nodeid);
+        name += ElementUtils.firstLetterUpperCase(specialization.getId());
+        name += "Node";
+        return name;
+    }
+
+    private static String nodePolymorphicClassName(NodeData node) {
+        return ElementUtils.firstLetterUpperCase(resolveNodeId(node)) + "PolymorphicNode";
+    }
+
+    private static String resolveNodeId(NodeData node) {
+        String nodeid = node.getNodeId();
+        if (nodeid.endsWith("Node") && !nodeid.equals("Node")) {
+            nodeid = nodeid.substring(0, nodeid.length() - 4);
+        }
+        return nodeid;
+    }
+
+    private static String valueNameEvaluated(Parameter targetParameter) {
+        return valueName(targetParameter) + "Evaluated";
+    }
+
+    private static String implicitTypeName(Parameter param) {
+        return param.getLocalName() + "ImplicitType";
+    }
+
+    private static String polymorphicTypeName(NodeExecutionData param) {
+        return param.getName() + "PolymorphicType";
+    }
+
+    private static String valueName(Parameter param) {
+        return param.getLocalName();
+    }
+
+    private static CodeTree createAccessChild(NodeExecutionData targetExecution, String thisReference) {
+        String reference = thisReference;
+        if (reference == null) {
+            reference = "this";
+        }
+        CodeTreeBuilder builder = CodeTreeBuilder.createBuilder();
+        Element accessElement = targetExecution.getChild().getAccessElement();
+        if (accessElement == null || accessElement.getKind() == ElementKind.METHOD) {
+            builder.string(reference).string(".").string(targetExecution.getChild().getName());
+        } else if (accessElement.getKind() == ElementKind.FIELD) {
+            builder.string(reference).string(".").string(accessElement.getSimpleName().toString());
+        } else {
+            throw new AssertionError();
+        }
+        if (targetExecution.isIndexed()) {
+            builder.string("[" + targetExecution.getIndex() + "]");
+        }
+        return builder.getRoot();
+    }
+
+    private static String castValueName(Parameter parameter) {
+        return valueName(parameter) + "Cast";
+    }
+
+    private void addInternalValueParameters(CodeExecutableElement method, TemplateMethod specialization, boolean forceFrame, boolean evaluated) {
+        if (forceFrame && specialization.getSpecification().findParameterSpec("frame") != null) {
+            method.addParameter(new CodeVariableElement(getContext().getTruffleTypes().getFrame(), "frameValue"));
+        }
+        for (Parameter parameter : specialization.getParameters()) {
+            ParameterSpec spec = parameter.getSpecification();
+            if (forceFrame && spec.getName().equals("frame")) {
+                continue;
+            }
+            if (spec.isLocal()) {
+                continue;
+            }
+
+            String name = valueName(parameter);
+            if (evaluated && spec.isSignature()) {
+                name = valueNameEvaluated(parameter);
+            }
+
+            method.addParameter(new CodeVariableElement(parameter.getType(), name));
+        }
+    }
+
+    private static void addInternalValueParameterNames(CodeTreeBuilder builder, TemplateMethod source, TemplateMethod specialization, String unexpectedValueName, boolean forceFrame,
+                    Map<String, String> customNames) {
+        if (forceFrame && specialization.getSpecification().findParameterSpec("frame") != null) {
+            builder.string("frameValue");
+        }
+        for (Parameter parameter : specialization.getParameters()) {
+            ParameterSpec spec = parameter.getSpecification();
+            if (forceFrame && spec.getName().equals("frame")) {
+                continue;
+            }
+
+            if (parameter.getSpecification().isLocal()) {
+                continue;
+            }
+
+            Parameter sourceParameter = source.findParameter(parameter.getLocalName());
+
+            if (customNames != null && customNames.containsKey(parameter.getLocalName())) {
+                builder.string(customNames.get(parameter.getLocalName()));
+            } else if (unexpectedValueName != null && parameter.getLocalName().equals(unexpectedValueName)) {
+                builder.cast(parameter.getType(), CodeTreeBuilder.singleString("ex.getResult()"));
+            } else if (sourceParameter != null) {
+                builder.string(valueName(sourceParameter, parameter));
+            } else {
+                builder.string(valueName(parameter));
+            }
+        }
+    }
+
+    private static String valueName(Parameter sourceParameter, Parameter targetParameter) {
+        if (!sourceParameter.getSpecification().isSignature()) {
+            return valueName(targetParameter);
+        } else if (sourceParameter.getTypeSystemType() != null && targetParameter.getTypeSystemType() != null) {
+            if (sourceParameter.getTypeSystemType().needsCastTo(targetParameter.getTypeSystemType())) {
+                return castValueName(targetParameter);
+            }
+        }
+        return valueName(targetParameter);
+    }
+
+    private static CodeTree createTemplateMethodCall(CodeTreeBuilder parent, CodeTree target, TemplateMethod sourceMethod, TemplateMethod targetMethod, String unexpectedValueName,
+                    String... customSignatureValueNames) {
+        CodeTreeBuilder builder = parent.create();
+
+        boolean castedValues = sourceMethod != targetMethod;
+
+        builder.startGroup();
+        ExecutableElement method = targetMethod.getMethod();
+        if (method == null) {
+            throw new UnsupportedOperationException();
+        }
+        TypeElement targetClass = ElementUtils.findNearestEnclosingType(method.getEnclosingElement());
+        NodeData node = (NodeData) targetMethod.getTemplate();
+
+        if (target == null) {
+            boolean accessible = targetMethod.canBeAccessedByInstanceOf(node.getNodeType());
+            if (accessible) {
+                if (builder.findMethod().getModifiers().contains(STATIC)) {
+                    if (method.getModifiers().contains(STATIC)) {
+                        builder.type(targetClass.asType());
+                    } else {
+                        builder.string(THIS_NODE_LOCAL_VAR_NAME);
+                    }
+                } else {
+                    if (targetMethod instanceof ExecutableTypeData) {
+                        builder.string("this");
+                    } else {
+                        builder.string("super");
+                    }
+                }
+            } else {
+                if (method.getModifiers().contains(STATIC)) {
+                    builder.type(targetClass.asType());
+                } else {
+                    Parameter firstParameter = null;
+                    for (Parameter searchParameter : targetMethod.getParameters()) {
+                        if (searchParameter.getSpecification().isSignature()) {
+                            firstParameter = searchParameter;
+                            break;
+                        }
+                    }
+                    if (firstParameter == null) {
+                        throw new AssertionError();
+                    }
+
+                    Parameter sourceParameter = sourceMethod.findParameter(firstParameter.getLocalName());
+
+                    if (castedValues && sourceParameter != null) {
+                        builder.string(valueName(sourceParameter, firstParameter));
+                    } else {
+                        builder.string(valueName(firstParameter));
+                    }
+                }
+            }
+            builder.string(".");
+        } else {
+            builder.tree(target);
+        }
+        builder.startCall(method.getSimpleName().toString());
+
+        int signatureIndex = 0;
+
+        for (Parameter targetParameter : targetMethod.getParameters()) {
+            Parameter valueParameter = null;
+            if (sourceMethod != null) {
+                valueParameter = sourceMethod.findParameter(targetParameter.getLocalName());
+            }
+            if (valueParameter == null) {
+                valueParameter = targetParameter;
+            }
+            TypeMirror targetType = targetParameter.getType();
+            TypeMirror valueType = null;
+            if (valueParameter != null) {
+                valueType = valueParameter.getType();
+            }
+
+            if (signatureIndex < customSignatureValueNames.length && targetParameter.getSpecification().isSignature()) {
+                builder.string(customSignatureValueNames[signatureIndex]);
+                signatureIndex++;
+            } else if (targetParameter.getSpecification().isLocal()) {
+                builder.startGroup();
+                if (builder.findMethod().getModifiers().contains(Modifier.STATIC)) {
+                    builder.string(THIS_NODE_LOCAL_VAR_NAME).string(".");
+                } else {
+                    builder.string("this.");
+                }
+                builder.string(targetParameter.getSpecification().getName());
+                builder.end();
+            } else if (unexpectedValueName != null && targetParameter.getLocalName().equals(unexpectedValueName)) {
+                builder.cast(targetParameter.getType(), CodeTreeBuilder.singleString("ex.getResult()"));
+            } else if (!ElementUtils.needsCastTo(valueType, targetType)) {
+                builder.startGroup();
+                builder.string(valueName(targetParameter));
+                builder.end();
+            } else {
+                builder.string(castValueName(targetParameter));
+            }
+        }
+
+        builder.end().end();
+
+        return builder.getRoot();
+    }
+
+    private static String baseClassName(NodeData node) {
+        String nodeid = resolveNodeId(node);
+        String name = ElementUtils.firstLetterUpperCase(nodeid);
+        name += "BaseNode";
+        return name;
+    }
+
+    private static CodeTree createCallTypeSystemMethod(CodeTreeBuilder parent, NodeData node, String methodName, CodeTree... args) {
+        CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+        startCallTypeSystemMethod(builder, node.getTypeSystem(), methodName);
+        for (CodeTree arg : args) {
+            builder.tree(arg);
+        }
+        builder.end().end();
+        return builder.getRoot();
+    }
+
+    private static void startCallTypeSystemMethod(CodeTreeBuilder body, TypeSystemData typeSystem, String methodName) {
+        GeneratedTypeMirror typeMirror = new GeneratedTypeMirror(ElementUtils.getPackageName(typeSystem.getTemplateType()), TypeSystemCodeGenerator.typeName(typeSystem));
+        body.startGroup();
+        body.staticReference(typeMirror, TypeSystemCodeGenerator.singletonName(typeSystem));
+        body.string(".").startCall(methodName);
+    }
+
+    /**
+     * <pre>
+     * variant1 $condition != null
+     * 
+     * $type $name = defaultValue($type);
+     * if ($condition) {
+     *     $name = $value;
+     * }
+     * 
+     * variant2 $condition != null
+     * $type $name = $value;
+     * </pre>
+     *
+     * .
+     */
+    private static CodeTree createLazyAssignment(CodeTreeBuilder parent, String name, TypeMirror type, CodeTree condition, CodeTree value) {
+        CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+        if (condition == null) {
+            builder.declaration(type, name, value);
+        } else {
+            builder.declaration(type, name, new CodeTreeBuilder(parent).defaultValue(type).getRoot());
+
+            builder.startIf().tree(condition).end();
+            builder.startBlock();
+            builder.startStatement();
+            builder.string(name);
+            builder.string(" = ");
+            builder.tree(value);
+            builder.end(); // statement
+            builder.end(); // block
+        }
+        return builder.getRoot();
+    }
+
+    private void emitEncounteredSynthetic(CodeTreeBuilder builder, TemplateMethod current) {
+        CodeTreeBuilder nodes = builder.create();
+        CodeTreeBuilder arguments = builder.create();
+        nodes.startCommaGroup();
+        arguments.startCommaGroup();
+        boolean empty = true;
+        for (Parameter parameter : current.getParameters()) {
+            NodeExecutionData executionData = parameter.getSpecification().getExecution();
+            if (executionData != null) {
+                if (executionData.isShortCircuit()) {
+                    nodes.nullLiteral();
+                    arguments.string(valueName(parameter.getPreviousParameter()));
+                }
+                nodes.tree(createAccessChild(executionData, "rootNode"));
+                arguments.string(valueName(parameter));
+                empty = false;
+            }
+        }
+        nodes.end();
+        arguments.end();
+        builder.startStatement().startStaticCall(context.getTruffleTypes().getCompilerDirectives(), "transferToInterpreter").end().end();
+
+        builder.declaration(baseClassName(getModel()), "rootNode", builder.create().startStaticCall(context.getTruffleTypes().getDslShare(), DSLSHARE_FIND_ROOT).string("this").end());
+        builder.startThrow().startNew(getContext().getType(UnsupportedSpecializationException.class));
+        builder.string("rootNode");
+        builder.startNewArray(getContext().getTruffleTypes().getNodeArray(), null);
+        builder.tree(nodes.getRoot());
+        builder.end();
+        if (!empty) {
+            builder.tree(arguments.getRoot());
+        }
+        builder.end().end();
+    }
+
+    private static List<ExecutableElement> findUserConstructors(TypeMirror nodeType) {
+        List<ExecutableElement> constructors = new ArrayList<>();
+        for (ExecutableElement constructor : ElementFilter.constructorsIn(ElementUtils.fromTypeMirror(nodeType).getEnclosedElements())) {
+            if (constructor.getModifiers().contains(PRIVATE)) {
+                continue;
+            }
+            if (isCopyConstructor(constructor)) {
+                continue;
+            }
+            constructors.add(constructor);
+        }
+
+        if (constructors.isEmpty()) {
+            constructors.add(new CodeExecutableElement(null, ElementUtils.getSimpleName(nodeType)));
+        }
+
+        return constructors;
+    }
+
+    private static ExecutableElement findCopyConstructor(TypeMirror type) {
+        for (ExecutableElement constructor : ElementFilter.constructorsIn(ElementUtils.fromTypeMirror(type).getEnclosedElements())) {
+            if (constructor.getModifiers().contains(PRIVATE)) {
+                continue;
+            }
+            if (isCopyConstructor(constructor)) {
+                return constructor;
+            }
+        }
+
+        return null;
+    }
+
+    private static boolean isCopyConstructor(ExecutableElement element) {
+        if (element.getParameters().size() != 1) {
+            return false;
+        }
+        VariableElement var = element.getParameters().get(0);
+        TypeElement enclosingType = ElementUtils.findNearestEnclosingType(var);
+        if (ElementUtils.typeEquals(var.asType(), enclosingType.asType())) {
+            return true;
+        }
+        List<TypeElement> types = ElementUtils.getDirectSuperTypes(enclosingType);
+        for (TypeElement type : types) {
+            if (!(type instanceof CodeTypeElement)) {
+                // no copy constructors which are not generated types
+                return false;
+            }
+
+            if (ElementUtils.typeEquals(var.asType(), type.asType())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    protected void createChildren(NodeData node) {
+        List<CodeTypeElement> casts = new ArrayList<>(getElement().getEnclosedElements());
+        getElement().getEnclosedElements().clear();
+
+        Map<NodeData, List<TypeElement>> childTypes = new LinkedHashMap<>();
+        for (NodeData nodeChild : node.getEnclosingNodes()) {
+            NodeCodeGenerator generator = new NodeCodeGenerator();
+            childTypes.put(nodeChild, generator.process(null, nodeChild).getEnclosedElements());
+        }
+
+        if (node.needsFactory() || node.getNodeDeclaringChildren().size() > 0) {
+            NodeFactoryFactory factory = new NodeFactoryFactory(childTypes);
+            add(factory, node);
+            factory.getElement().getEnclosedElements().addAll(casts);
+        }
+    }
+
+    private static CodeTree createCastType(TypeSystemData typeSystem, TypeData sourceType, TypeData targetType, boolean expect, CodeTree value) {
+        if (targetType == null) {
+            return value;
+        } else if (sourceType != null && !sourceType.needsCastTo(targetType)) {
+            return value;
+        }
+
+        CodeTreeBuilder builder = CodeTreeBuilder.createBuilder();
+        String targetMethodName;
+        if (expect) {
+            targetMethodName = TypeSystemCodeGenerator.expectTypeMethodName(targetType);
+        } else {
+            targetMethodName = TypeSystemCodeGenerator.asTypeMethodName(targetType);
+        }
+        startCallTypeSystemMethod(builder, typeSystem, targetMethodName);
+        builder.tree(value);
+        builder.end().end();
+        return builder.getRoot();
+    }
+
+    private static CodeTree createExpectType(TypeSystemData typeSystem, TypeData sourceType, TypeData targetType, CodeTree expression) {
+        return createCastType(typeSystem, sourceType, targetType, true, expression);
+    }
+
+    private CodeTree createDeoptimize(CodeTreeBuilder parent) {
+        CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+        builder.startStatement();
+        builder.startStaticCall(getContext().getTruffleTypes().getCompilerDirectives(), "transferToInterpreterAndInvalidate").end();
+        builder.end();
+        return builder.getRoot();
+    }
+
+    private class NodeFactoryFactory extends AbstractClassElementFactory<NodeData> {
+
+        private final Map<NodeData, List<TypeElement>> childTypes;
+        private CodeTypeElement generatedNode;
+
+        public NodeFactoryFactory(Map<NodeData, List<TypeElement>> childElements) {
+            this.childTypes = childElements;
+        }
+
+        @Override
+        protected CodeTypeElement create(NodeData node) {
+            Modifier visibility = ElementUtils.getVisibility(node.getTemplateType().getModifiers());
+
+            CodeTypeElement clazz = createClass(node, modifiers(), factoryClassName(node), null, false);
+            if (visibility != null) {
+                clazz.getModifiers().add(visibility);
+            }
+            clazz.getModifiers().add(Modifier.FINAL);
+            return clazz;
+        }
+
+        @Override
+        protected void createChildren(NodeData node) {
+            CodeTypeElement clazz = getElement();
+
+            Modifier createVisibility = ElementUtils.getVisibility(clazz.getModifiers());
+
+            if (node.needsFactory()) {
+                NodeBaseFactory factory = new NodeBaseFactory();
+                add(factory, node.getGenericSpecialization() == null ? node.getSpecializations().get(0) : node.getGenericSpecialization());
+                generatedNode = factory.getElement();
+
+                createFactoryMethods(node, clazz, createVisibility);
+
+                for (SpecializationData specialization : node.getSpecializations()) {
+                    if (!specialization.isReachable() || specialization.isGeneric()) {
+                        continue;
+                    }
+
+                    if (specialization.isPolymorphic() && node.isPolymorphic(context)) {
+                        PolymorphicNodeFactory polymorphicFactory = new PolymorphicNodeFactory(generatedNode);
+                        add(polymorphicFactory, specialization);
+                        continue;
+                    }
+
+                    add(new SpecializedNodeFactory(generatedNode), specialization);
+                }
+
+                TypeMirror nodeFactory = ElementUtils.getDeclaredType(ElementUtils.fromTypeMirror(getContext().getTruffleTypes().getNodeFactoryBase()), node.getNodeType());
+                clazz.setSuperClass(nodeFactory);
+                clazz.add(createNodeFactoryConstructor(node));
+                clazz.add(createCreateNodeMethod(node));
+// clazz.add(createGetNodeClassMethod(node));
+// clazz.add(createGetNodeSignaturesMethod());
+// clazz.add(createGetChildrenSignatureMethod(node));
+                clazz.add(createGetInstanceMethod(node, createVisibility));
+                clazz.add(createInstanceConstant(node, clazz.asType()));
+            }
+
+            for (NodeData childNode : childTypes.keySet()) {
+                if (childNode.getTemplateType().getModifiers().contains(Modifier.PRIVATE)) {
+                    continue;
+                }
+
+                for (TypeElement type : childTypes.get(childNode)) {
+                    Set<Modifier> typeModifiers = ((CodeTypeElement) type).getModifiers();
+                    Modifier visibility = ElementUtils.getVisibility(type.getModifiers());
+                    typeModifiers.clear();
+                    if (visibility != null) {
+                        typeModifiers.add(visibility);
+                    }
+
+                    typeModifiers.add(Modifier.STATIC);
+                    typeModifiers.add(Modifier.FINAL);
+                    clazz.add(type);
+                }
+            }
+
+            List<NodeData> children = node.getNodeDeclaringChildren();
+            if (node.getDeclaringNode() == null && children.size() > 0) {
+                clazz.add(createGetFactories(node));
+            }
+
+        }
+
+        private Element createNodeFactoryConstructor(NodeData node) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PRIVATE), null, factoryClassName(node));
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.startStatement();
+            builder.startCall("super");
+
+            // node type
+            builder.typeLiteral(node.getNodeType());
+
+            // execution signature
+            builder.startGroup();
+            if (node.getChildExecutions().isEmpty()) {
+                builder.staticReference(context.getTruffleTypes().getDslMetadata(), EMPTY_CLASS_ARRAY);
+            } else {
+                builder.startNewArray(new ArrayCodeTypeMirror(context.getType(Class.class)), null);
+                for (NodeExecutionData execution : node.getChildExecutions()) {
+                    builder.typeLiteral(execution.getNodeType());
+                }
+                builder.end();
+            }
+            builder.end();
+
+            // node signatures
+            builder.startGroup();
+            builder.startNewArray(new ArrayCodeTypeMirror(new ArrayCodeTypeMirror(context.getType(Class.class))), null);
+            List<ExecutableElement> constructors = findUserConstructors(generatedNode.asType());
+            for (ExecutableElement constructor : constructors) {
+                builder.startGroup();
+                if (constructor.getParameters().isEmpty()) {
+                    builder.staticReference(context.getTruffleTypes().getDslMetadata(), EMPTY_CLASS_ARRAY);
+                } else {
+                    builder.startNewArray(new ArrayCodeTypeMirror(context.getType(Class.class)), null);
+                    for (VariableElement var : constructor.getParameters()) {
+                        builder.typeLiteral(var.asType());
+                    }
+                    builder.end();
+                }
+                builder.end();
+            }
+            builder.end();
+            builder.end();
+
+            builder.end().end().end();
+            return method;
+        }
+
+        private CodeExecutableElement createCreateNodeMethod(NodeData node) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), node.getNodeType(), "createNode");
+            CodeVariableElement arguments = new CodeVariableElement(getContext().getType(Object.class), "arguments");
+            method.setVarArgs(true);
+            method.addParameter(arguments);
+
+            CodeTreeBuilder builder = method.createBuilder();
+            List<ExecutableElement> signatures = findUserConstructors(generatedNode.asType());
+            boolean ifStarted = false;
+
+            for (ExecutableElement element : signatures) {
+                ifStarted = builder.startIf(ifStarted);
+                builder.string("arguments.length == " + element.getParameters().size());
+
+                int index = 0;
+                for (VariableElement param : element.getParameters()) {
+                    if (ElementUtils.isObject(param.asType())) {
+                        continue;
+                    }
+                    builder.string(" && ");
+                    if (!param.asType().getKind().isPrimitive()) {
+                        builder.string("(arguments[" + index + "] == null || ");
+                    }
+                    builder.string("arguments[" + index + "] instanceof ");
+                    builder.type(ElementUtils.boxType(getContext(), param.asType()));
+                    if (!param.asType().getKind().isPrimitive()) {
+                        builder.string(")");
+                    }
+                    index++;
+                }
+                builder.end();
+                builder.startBlock();
+
+                builder.startReturn().startCall("create");
+                index = 0;
+                for (VariableElement param : element.getParameters()) {
+                    builder.startGroup();
+                    if (!ElementUtils.isObject(param.asType())) {
+                        builder.string("(").type(param.asType()).string(") ");
+                    }
+                    builder.string("arguments[").string(String.valueOf(index)).string("]");
+                    builder.end();
+                    index++;
+                }
+                builder.end().end();
+
+                builder.end(); // block
+            }
+
+            builder.startElseBlock();
+            builder.startThrow().startNew(getContext().getType(IllegalArgumentException.class));
+            builder.doubleQuote("Invalid create signature.");
+            builder.end().end();
+            builder.end(); // else block
+            return method;
+        }
+
+        private ExecutableElement createGetInstanceMethod(NodeData node, Modifier visibility) {
+            TypeElement nodeFactoryType = ElementUtils.fromTypeMirror(getContext().getType(NodeFactory.class));
+            TypeMirror returnType = ElementUtils.getDeclaredType(nodeFactoryType, node.getNodeType());
+
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(), returnType, "getInstance");
+            if (visibility != null) {
+                method.getModifiers().add(visibility);
+            }
+            method.getModifiers().add(Modifier.STATIC);
+
+            String varName = instanceVarName(node);
+
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.startIf();
+            builder.string(varName).string(" == null");
+            builder.end().startBlock();
+
+            builder.startStatement();
+            builder.string(varName);
+            builder.string(" = ");
+            builder.startNew(factoryClassName(node)).end();
+            builder.end();
+
+            builder.end();
+            builder.startReturn().string(varName).end();
+            return method;
+        }
+
+        private String instanceVarName(NodeData node) {
+            if (node.getDeclaringNode() != null) {
+                return ElementUtils.firstLetterLowerCase(factoryClassName(node)) + "Instance";
+            } else {
+                return "instance";
+            }
+        }
+
+        private CodeVariableElement createInstanceConstant(NodeData node, TypeMirror factoryType) {
+            String varName = instanceVarName(node);
+            CodeVariableElement var = new CodeVariableElement(modifiers(), factoryType, varName);
+            var.getModifiers().add(Modifier.PRIVATE);
+            var.getModifiers().add(Modifier.STATIC);
+            return var;
+        }
+
+        private ExecutableElement createGetFactories(NodeData node) {
+            List<NodeData> children = node.getNodeDeclaringChildren();
+            if (node.needsFactory()) {
+                children.add(node);
+            }
+
+            List<TypeMirror> nodeTypesList = new ArrayList<>();
+            TypeMirror prev = null;
+            boolean allSame = true;
+            for (NodeData child : children) {
+                nodeTypesList.add(child.getNodeType());
+                if (prev != null && !ElementUtils.typeEquals(child.getNodeType(), prev)) {
+                    allSame = false;
+                }
+                prev = child.getNodeType();
+            }
+            TypeMirror commonNodeSuperType = ElementUtils.getCommonSuperType(getContext(), nodeTypesList.toArray(new TypeMirror[nodeTypesList.size()]));
+
+            Types types = getContext().getEnvironment().getTypeUtils();
+            TypeMirror factoryType = getContext().getType(NodeFactory.class);
+            TypeMirror baseType;
+            if (allSame) {
+                baseType = ElementUtils.getDeclaredType(ElementUtils.fromTypeMirror(factoryType), commonNodeSuperType);
+            } else {
+                baseType = ElementUtils.getDeclaredType(ElementUtils.fromTypeMirror(factoryType), types.getWildcardType(commonNodeSuperType, null));
+            }
+            TypeMirror listType = ElementUtils.getDeclaredType(ElementUtils.fromTypeMirror(getContext().getType(List.class)), baseType);
+
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC, STATIC), listType, "getFactories");
+
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.startReturn();
+            builder.startStaticCall(getContext().getType(Arrays.class), "asList");
+
+            for (NodeData child : children) {
+                builder.startGroup();
+                NodeData childNode = child;
+                List<NodeData> factories = new ArrayList<>();
+                while (childNode.getDeclaringNode() != null) {
+                    factories.add(childNode);
+                    childNode = childNode.getDeclaringNode();
+                }
+                Collections.reverse(factories);
+                for (NodeData nodeData : factories) {
+                    builder.string(factoryClassName(nodeData)).string(".");
+                }
+                builder.string("getInstance()");
+                builder.end();
+            }
+            builder.end();
+            builder.end();
+            return method;
+        }
+
+        private void createFactoryMethods(NodeData node, CodeTypeElement clazz, Modifier createVisibility) {
+            List<ExecutableElement> constructors = findUserConstructors(generatedNode.asType());
+            for (ExecutableElement constructor : constructors) {
+                clazz.add(createCreateMethod(node, createVisibility, constructor));
+            }
+        }
+
+        private CodeExecutableElement createCreateMethod(NodeData node, Modifier visibility, ExecutableElement constructor) {
+            CodeExecutableElement method = CodeExecutableElement.clone(getContext().getEnvironment(), constructor);
+            method.setSimpleName(CodeNames.of("create"));
+            method.getModifiers().clear();
+            if (visibility != null) {
+                method.getModifiers().add(visibility);
+            }
+            method.getModifiers().add(Modifier.STATIC);
+            method.setReturnType(node.getNodeType());
+
+            CodeTreeBuilder body = method.createBuilder();
+            body.startReturn();
+            if (node.getSpecializations().isEmpty()) {
+                body.nullLiteral();
+            } else {
+                body.startCall(nodeSpecializationClassName(node.getSpecializations().get(0)), FACTORY_METHOD_NAME);
+                for (VariableElement var : method.getParameters()) {
+                    body.string(var.getSimpleName().toString());
+                }
+                body.end();
+            }
+            body.end();
+            return method;
+        }
+
+    }
+
+    private class NodeBaseFactory extends AbstractClassElementFactory<SpecializationData> {
+
+        @Override
+        protected CodeTypeElement create(SpecializationData specialization) {
+            NodeData node = specialization.getNode();
+            CodeTypeElement clazz = createClass(node, modifiers(PRIVATE, ABSTRACT, STATIC), baseClassName(node), node.getNodeType(), false);
+            clazz.getImplements().add(context.getTruffleTypes().getDslNode());
+
+            for (NodeChildData child : node.getChildren()) {
+                clazz.add(createChildField(child));
+
+                if (child.getAccessElement() != null && child.getAccessElement().getModifiers().contains(Modifier.ABSTRACT)) {
+                    ExecutableElement getter = (ExecutableElement) child.getAccessElement();
+                    CodeExecutableElement method = CodeExecutableElement.clone(getContext().getEnvironment(), getter);
+                    method.getModifiers().remove(Modifier.ABSTRACT);
+                    CodeTreeBuilder builder = method.createBuilder();
+                    builder.startReturn().string("this.").string(child.getName()).end();
+                    clazz.add(method);
+                }
+            }
+
+            for (NodeFieldData field : node.getFields()) {
+                if (!field.isGenerated()) {
+                    continue;
+                }
+
+                clazz.add(new CodeVariableElement(modifiers(PROTECTED, FINAL), field.getType(), field.getName()));
+                if (field.getGetter() != null && field.getGetter().getModifiers().contains(Modifier.ABSTRACT)) {
+                    CodeExecutableElement method = CodeExecutableElement.clone(getContext().getEnvironment(), field.getGetter());
+                    method.getModifiers().remove(Modifier.ABSTRACT);
+                    method.createBuilder().startReturn().string("this.").string(field.getName()).end();
+                    clazz.add(method);
+                }
+            }
+
+            for (String assumption : node.getAssumptions()) {
+                clazz.add(createAssumptionField(assumption));
+            }
+
+            createConstructors(node, clazz);
+
+            return clazz;
+        }
+
+        @Override
+        protected void createChildren(SpecializationData specialization) {
+            NodeData node = specialization.getNode();
+            CodeTypeElement clazz = getElement();
+
+            SpecializationGroup rootGroup = createSpecializationGroups(node);
+
+            if (node.needsRewrites(context)) {
+                if (node.isPolymorphic(context)) {
+
+                    CodeVariableElement var = new CodeVariableElement(modifiers(PROTECTED), clazz.asType(), "next0");
+                    var.getAnnotationMirrors().add(new CodeAnnotationMirror(getContext().getTruffleTypes().getChildAnnotation()));
+                    clazz.add(var);
+
+                    CodeExecutableElement genericCachedExecute = createCachedExecute(node, node.getPolymorphicSpecialization());
+                    clazz.add(genericCachedExecute);
+
+                }
+
+                for (CodeExecutableElement method : createImplicitChildrenAccessors()) {
+                    clazz.add(method);
+                }
+                clazz.add(createInfoMessage(node));
+                clazz.add(createMonomorphicRewrite());
+                clazz.add(createCreateSpecializationMethod(node, rootGroup));
+            }
+
+            clazz.add(createAdoptChildren0());
+            clazz.add(createGetMetadata0(true));
+            clazz.add(createUpdateTypes0());
+            clazz.add(createGetNext());
+        }
+
+        private Element createGetNext() {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC, FINAL), context.getType(Node.class), "getNext0");
+            CodeTreeBuilder builder = method.createBuilder();
+            NodeData node = getModel().getNode();
+
+            if (node.isPolymorphic(context)) {
+                builder.startReturn().string("next0").end();
+            } else {
+                builder.returnNull();
+            }
+
+            return method;
+        }
+
+        protected final CodeExecutableElement createUpdateTypes0() {
+            ArrayType classArray = new ArrayCodeTypeMirror(context.getType(Class.class));
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), context.getType(void.class), "updateTypes0");
+            method.getParameters().add(new CodeVariableElement(classArray, "types"));
+
+            if (getModel().isPolymorphic()) {
+                CodeTreeBuilder builder = method.createBuilder();
+
+                int index = 0;
+                for (NodeExecutionData execution : getModel().getNode().getChildExecutions()) {
+                    String fieldName = polymorphicTypeName(execution);
+
+                    builder.startStatement();
+                    builder.string(fieldName).string(" = ").string("types[").string(String.valueOf(index)).string("]");
+                    builder.end();
+                    index++;
+                }
+            }
+
+            return method;
+        }
+
+        protected final CodeExecutableElement createGetMetadata0(boolean empty) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), context.getTruffleTypes().getDslMetadata(), "getMetadata0");
+            if (empty) {
+                method.createBuilder().startReturn().staticReference(context.getTruffleTypes().getDslMetadata(), "NONE").end();
+            } else {
+                method.createBuilder().startReturn().string(METADATA_FIELD_NAME).end();
+            }
+            return method;
+        }
+
+        private CodeExecutableElement createAdoptChildren0() {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC, FINAL), context.getType(void.class), "adoptChildren0");
+            method.getParameters().add(new CodeVariableElement(context.getTruffleTypes().getNode(), "other"));
+            method.getParameters().add(new CodeVariableElement(context.getTruffleTypes().getNode(), "newNext"));
+            NodeData node = getModel().getNode();
+            CodeTreeBuilder builder = method.createBuilder();
+            List<NodeExecutionData> executions = node.getChildExecutions();
+
+            if (executions.size() > 0) {
+                builder.startIf().string("other == null").end().startBlock();
+                for (NodeExecutionData execution : executions) {
+                    builder.startStatement().tree(createAccessChild(execution, "this")).string(" = null").end();
+                }
+                builder.end().startElseBlock();
+
+                String access;
+                if (executions.size() > 1) {
+                    builder.declaration(baseClassName(node), "otherCast", builder.create().cast(baseClassName(node)).string("other"));
+                    access = "otherCast";
+                } else {
+                    assert executions.size() == 1;
+                    access = "((" + baseClassName(node) + ") other)";
+                }
+                for (NodeExecutionData execution : executions) {
+                    builder.startStatement().tree(createAccessChild(execution, "this")).string(" = ").tree(createAccessChild(execution, access)).end();
+                }
+
+                builder.end();
+            }
+
+            if (getModel().getNode().isPolymorphic(context)) {
+                builder.startIf().string("newNext == null").end().startBlock();
+                builder.statement("this.next0 = null");
+                builder.end().startElseBlock();
+                builder.statement("this.next0 = (" + baseClassName(getModel().getNode()) + ") newNext");
+                builder.end();
+            }
+
+            return method;
+        }
+
+        private List<CodeExecutableElement> createImplicitChildrenAccessors() {
+            NodeData node = getModel().getNode();
+            List<Set<TypeData>> prototype = Collections.nCopies(node.getGenericSpecialization().getParameters().size(), null);
+            List<Set<TypeData>> expectTypes = new ArrayList<>(prototype);
+
+            for (ExecutableTypeData executableType : node.getExecutableTypes()) {
+                for (int i = 0; i < executableType.getEvaluatedCount(); i++) {
+                    Parameter parameter = executableType.getSignatureParameter(i);
+                    if (i >= expectTypes.size()) {
+                        break;
+                    }
+                    Set<TypeData> types = expectTypes.get(i);
+                    if (types == null) {
+                        types = new TreeSet<>();
+                        expectTypes.set(i, types);
+                    }
+                    types.add(parameter.getTypeSystemType());
+                }
+            }
+
+            List<CodeExecutableElement> methods = new ArrayList<>();
+            List<Set<TypeData>> visitedList = new ArrayList<>(prototype);
+            for (SpecializationData spec : node.getSpecializations()) {
+                int signatureIndex = -1;
+                for (Parameter param : spec.getParameters()) {
+                    if (!param.getSpecification().isSignature()) {
+                        continue;
+                    }
+                    signatureIndex++;
+                    Set<TypeData> visitedTypeData = visitedList.get(signatureIndex);
+                    if (visitedTypeData == null) {
+                        visitedTypeData = new TreeSet<>();
+                        visitedList.set(signatureIndex, visitedTypeData);
+                    }
+
+                    if (visitedTypeData.contains(param.getTypeSystemType())) {
+                        continue;
+                    }
+                    visitedTypeData.add(param.getTypeSystemType());
+
+                    Set<TypeData> expect = expectTypes.get(signatureIndex);
+                    if (expect == null) {
+                        expect = Collections.emptySet();
+                    }
+
+                    methods.addAll(createExecuteChilds(param, expect));
+                }
+            }
+            return methods;
+        }
+
+        private CodeTree truffleBooleanOption(CodeTreeBuilder parent, String name) {
+            CodeTreeBuilder builder = parent.create();
+            builder.staticReference(getContext().getTruffleTypes().getTruffleOptions(), name);
+            return builder.getRoot();
+        }
+
+        private Element createInfoMessage(NodeData node) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PROTECTED, STATIC), getContext().getType(String.class), CREATE_INFO);
+            method.addParameter(new CodeVariableElement(getContext().getType(String.class), "message"));
+            addInternalValueParameters(method, node.getGenericSpecialization(), false, false);
+
+            CodeTreeBuilder builder = method.createBuilder();
+
+            builder.startIf().tree(truffleBooleanOption(builder, TruffleTypes.OPTION_DETAILED_REWRITE_REASONS)).end();
+            builder.startBlock();
+
+            builder.startStatement().string("StringBuilder builder = new StringBuilder(message)").end();
+            builder.startStatement().startCall("builder", "append").doubleQuote(" (").end().end();
+
+            String sep = null;
+            for (Parameter parameter : node.getGenericSpecialization().getSignatureParameters()) {
+                builder.startStatement();
+                builder.string("builder");
+                if (sep != null) {
+                    builder.startCall(".append").doubleQuote(sep).end();
+                }
+                builder.startCall(".append").doubleQuote(parameter.getLocalName()).end();
+                builder.startCall(".append").doubleQuote(" = ").end();
+                builder.startCall(".append").string(parameter.getLocalName()).end();
+                builder.end();
+
+                if (!ElementUtils.isPrimitive(parameter.getType())) {
+                    builder.startIf().string(parameter.getLocalName() + " != null").end();
+                    builder.startBlock();
+                }
+                builder.startStatement();
+                if (ElementUtils.isPrimitive(parameter.getType())) {
+                    builder.startCall("builder.append").doubleQuote(" (" + ElementUtils.getSimpleName(parameter.getType()) + ")").end();
+                } else {
+                    builder.startCall("builder.append").doubleQuote(" (").end();
+                    builder.startCall(".append").string(parameter.getLocalName() + ".getClass().getSimpleName()").end();
+                    builder.startCall(".append").doubleQuote(")").end();
+                }
+                builder.end();
+                if (!ElementUtils.isPrimitive(parameter.getType())) {
+                    builder.end();
+                }
+
+                sep = ", ";
+            }
+
+            builder.startStatement().startCall("builder", "append").doubleQuote(")").end().end();
+            builder.startReturn().string("builder.toString()").end();
+
+            builder.end();
+            builder.startElseBlock();
+            builder.startReturn().string("message").end();
+            builder.end();
+
+            return method;
+        }
+
+        private CodeExecutableElement createCachedExecute(NodeData node, SpecializationData polymorph) {
+            CodeExecutableElement cachedExecute = new CodeExecutableElement(modifiers(PROTECTED, ABSTRACT), polymorph.getReturnType().getType(), EXECUTE_CHAINED);
+            addInternalValueParameters(cachedExecute, polymorph, true, false);
+
+            ExecutableTypeData sourceExecutableType = node.findExecutableType(polymorph.getReturnType().getTypeSystemType(), 0);
+            boolean sourceThrowsUnexpected = sourceExecutableType != null && sourceExecutableType.hasUnexpectedValue(getContext());
+            if (sourceThrowsUnexpected && sourceExecutableType.getType().equals(node.getGenericSpecialization().getReturnType().getTypeSystemType())) {
+                sourceThrowsUnexpected = false;
+            }
+            if (sourceThrowsUnexpected) {
+                cachedExecute.getThrownTypes().add(getContext().getType(UnexpectedResultException.class));
+            }
+            return cachedExecute;
+
+        }
+
+        private void createConstructors(NodeData node, CodeTypeElement clazz) {
+            List<ExecutableElement> constructors = findUserConstructors(node.getNodeType());
+            ExecutableElement sourceSectionConstructor = null;
+            if (constructors.isEmpty()) {
+                clazz.add(createUserConstructor(clazz, null));
+            } else {
+                for (ExecutableElement constructor : constructors) {
+                    clazz.add(createUserConstructor(clazz, constructor));
+                    if (NodeParser.isSourceSectionConstructor(context, constructor)) {
+                        sourceSectionConstructor = constructor;
+                    }
+                }
+            }
+            if (node.needsRewrites(getContext())) {
+                ExecutableElement copyConstructor = findCopyConstructor(node.getNodeType());
+                clazz.add(createCopyConstructor(clazz, copyConstructor, sourceSectionConstructor));
+            }
+        }
+
+        private CodeExecutableElement createUserConstructor(CodeTypeElement type, ExecutableElement superConstructor) {
+            CodeExecutableElement method = new CodeExecutableElement(null, type.getSimpleName().toString());
+            CodeTreeBuilder builder = method.createBuilder();
+
+            NodeData node = getModel().getNode();
+
+            if (superConstructor != null) {
+                for (VariableElement param : superConstructor.getParameters()) {
+                    method.getParameters().add(CodeVariableElement.clone(param));
+                }
+            }
+
+            if (superConstructor != null) {
+                builder.startStatement().startSuperCall();
+                for (VariableElement param : superConstructor.getParameters()) {
+                    builder.string(param.getSimpleName().toString());
+                }
+                builder.end().end();
+            }
+
+            for (VariableElement var : type.getFields()) {
+                if (var.getModifiers().contains(STATIC)) {
+                    continue;
+                }
+                NodeChildData child = node.findChild(var.getSimpleName().toString());
+
+                if (child != null) {
+                    method.getParameters().add(new CodeVariableElement(child.getOriginalType(), child.getName()));
+                } else {
+                    method.getParameters().add(new CodeVariableElement(var.asType(), var.getSimpleName().toString()));
+                }
+
+                builder.startStatement();
+                String fieldName = var.getSimpleName().toString();
+
+                CodeTree init = createStaticCast(builder, child, fieldName);
+
+                builder.string("this.").string(fieldName).string(" = ").tree(init);
+                builder.end();
+            }
+            return method;
+        }
+
+        private CodeTree createStaticCast(CodeTreeBuilder parent, NodeChildData child, String fieldName) {
+            NodeData parentNode = getModel().getNode();
+            if (child != null) {
+                CreateCastData createCast = parentNode.findCast(child.getName());
+                if (createCast != null) {
+                    return createTemplateMethodCall(parent, null, parentNode.getGenericSpecialization(), createCast, null, fieldName);
+                }
+            }
+            return CodeTreeBuilder.singleString(fieldName);
+        }
+
+        private CodeExecutableElement createCopyConstructor(CodeTypeElement type, ExecutableElement superConstructor, ExecutableElement sourceSectionConstructor) {
+            CodeExecutableElement method = new CodeExecutableElement(null, type.getSimpleName().toString());
+            CodeTreeBuilder builder = method.createBuilder();
+            method.getParameters().add(new CodeVariableElement(type.asType(), "copy"));
+
+            if (superConstructor != null) {
+                builder.startStatement().startSuperCall().string("copy").end().end();
+            } else if (sourceSectionConstructor != null) {
+                builder.startStatement().startSuperCall().string("copy.getSourceSection()").end().end();
+            }
+
+            for (VariableElement var : type.getFields()) {
+                if (var.getModifiers().contains(STATIC) || !var.getModifiers().contains(FINAL)) {
+                    continue;
+                }
+                final String varName = var.getSimpleName().toString();
+                final TypeMirror varType = var.asType();
+                if (ElementUtils.isAssignable(varType, getContext().getTruffleTypes().getNodeArray())) {
+                    CodeTree size = builder.create().string("copy.", varName, ".length").getRoot();
+                    builder.startStatement().string("this.").string(varName).string(" = ").startNewArray((ArrayType) varType, size).end().end();
+                } else {
+                    builder.startStatement().string("this.", varName, " = copy.", varName).end();
+                }
+            }
+
+            return method;
+        }
+
+        private CodeVariableElement createAssumptionField(String assumption) {
+            CodeVariableElement var = new CodeVariableElement(getContext().getTruffleTypes().getAssumption(), assumption);
+            var.getModifiers().add(Modifier.FINAL);
+            return var;
+        }
+
+        private CodeVariableElement createChildField(NodeChildData child) {
+            TypeMirror type = child.getNodeType();
+            CodeVariableElement var = new CodeVariableElement(type, child.getName());
+            var.getModifiers().add(Modifier.PROTECTED);
+
+            DeclaredType annotationType;
+            if (child.getCardinality() == Cardinality.MANY) {
+                var.getModifiers().add(Modifier.FINAL);
+                annotationType = getContext().getTruffleTypes().getChildrenAnnotation();
+            } else {
+                annotationType = getContext().getTruffleTypes().getChildAnnotation();
+            }
+
+            var.getAnnotationMirrors().add(new CodeAnnotationMirror(annotationType));
+            return var;
+        }
+
+        private SpecializationGroup createSpecializationGroups(final NodeData node) {
+            List<SpecializationData> specializations = node.getSpecializations();
+            List<SpecializationData> filteredSpecializations = new ArrayList<>();
+            for (SpecializationData current : specializations) {
+                if (current.isUninitialized() || current.isPolymorphic() || !current.isReachable()) {
+                    continue;
+                }
+                filteredSpecializations.add(current);
+            }
+
+            return SpecializationGroup.create(filteredSpecializations);
+        }
+
+        protected final CodeExecutableElement createExecuteUninitialized() {
+            NodeData node = getModel().getNode();
+            SpecializationData generic = node.getGenericSpecialization();
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PROTECTED), generic.getReturnType().getType(), EXECUTE_UNINITIALIZED);
+            addInternalValueParameters(method, generic, true, false);
+            CodeTreeBuilder builder = method.createBuilder();
+
+            CodeTreeBuilder createSpecializationCall = builder.create();
+            createSpecializationCall.startCall(SPECIALIZE);
+            addInternalValueParameterNames(createSpecializationCall, generic, generic, null, node.needsFrame(getContext()), null);
+            createSpecializationCall.end();
+            builder.declaration(baseClassName(node), "newNode", createSpecializationCall);
+
+            if (generic.isReachable()) {
+                builder.startIf().string("newNode == null").end().startBlock();
+
+                builder.startIf().startStaticCall(context.getTruffleTypes().getCompilerDirectives(), "inInterpreter").end().end().startBlock();
+                builder.statement("containsFallback = true");
+                builder.end();
+                builder.tree(createGenericInvoke(builder, generic, generic));
+                builder.end();
+                builder.startElseBlock();
+                builder.startStatement().startStaticCall(context.getTruffleTypes().getCompilerDirectives(), "transferToInterpreterAndInvalidate").end().end();
+            }
+
+            builder.startReturn();
+            builder.startStaticCall(context.getTruffleTypes().getDslShare(), "rewriteUninitialized").string("this").string("newNode").end();
+            builder.string(".").startCall(EXECUTE_CHAINED);
+            addInternalValueParameterNames(builder, generic, generic, null, true, null);
+            builder.end();
+            builder.end();
+
+            if (generic.isReachable()) {
+                builder.end();
+            }
+
+            return method;
+        }
+
+        private CodeTree createInfoCall(CodeTreeBuilder parent, SpecializationData specialization, String reason) {
+            CodeTreeBuilder builder = parent.create();
+            builder.startCall(CREATE_INFO).string(reason);
+            addInternalValueParameterNames(builder, specialization, specialization, null, false, null);
+            builder.end();
+            return builder.getRoot();
+        }
+
+        private CodeExecutableElement createMonomorphicRewrite() {
+            NodeData node = getModel().getNode();
+
+            SpecializationData generic = node.getGenericSpecialization();
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PROTECTED, FINAL), generic.getReturnType().getType(), REWRITE);
+            addInternalValueParameters(method, generic, true, false);
+            method.addParameter(new CodeVariableElement(getContext().getType(String.class), "reason"));
+
+            CodeTreeBuilder builder = method.createBuilder();
+
+            builder.startStatement().startStaticCall(context.getTruffleTypes().getCompilerAsserts(), "neverPartOfCompilation").end().end();
+            String baseClassName = baseClassName(getModel().getNode());
+            CodeTreeBuilder createSpecializationCall = builder.create();
+            createSpecializationCall.startCall(SPECIALIZE);
+            addInternalValueParameterNames(createSpecializationCall, generic, generic, null, node.needsFrame(getContext()), null);
+            createSpecializationCall.end();
+            builder.declaration(baseClassName, "newNode", createSpecializationCall);
+
+            builder.startIf().string("newNode == null").end().startBlock();
+            builder.startStatement();
+            String uninitializedName = nodeSpecializationClassName(node.getUninitializedSpecialization());
+            builder.string("newNode = ").startNew(uninitializedName).string("this").end();
+            builder.end();
+            if (node.isFallbackReachable()) {
+                builder.startStatement().string("((", uninitializedName, ") newNode).containsFallback = true").end();
+            }
+            builder.end();
+
+            builder.startStatement();
+            builder.type(getContext().getType(String.class)).string(" message = ").tree(createInfoCall(builder, generic, "reason"));
+            builder.end();
+
+            builder.declaration(baseClassName, "returnNode",
+                            builder.create().startStaticCall(context.getTruffleTypes().getDslShare(), DSLSHARE_REWRITE).string("this").string("newNode").string("message").end().getRoot());
+            builder.startIf().string("returnNode == null").end().startBlock();
+            builder.tree(createRewritePolymorphic(builder, node, "this"));
+            builder.end();
+
+            builder.startReturn();
+            builder.startCall("returnNode", EXECUTE_CHAINED);
+            addInternalValueParameterNames(builder, node.getGenericSpecialization(), node.getGenericSpecialization(), null, true, null);
+            builder.end();
+            builder.end();
+
+            return method;
+        }
+
+        private CodeTree createRewritePolymorphic(CodeTreeBuilder parent, NodeData node, String currentNode) {
+            String polyClassName = nodePolymorphicClassName(node);
+            CodeTreeBuilder builder = parent.create();
+
+            builder.startStatement().string("returnNode = ");
+            builder.startStaticCall(context.getTruffleTypes().getDslShare(), DSLSHARE_REWRITE_TO_POLYMORHPIC);
+            builder.string("this");
+            builder.tree(builder.create().startNew(nodeSpecializationClassName(node.getUninitializedSpecialization())).string(currentNode).end().getRoot());
+            builder.tree(builder.create().startNew(polyClassName).string(currentNode).end().getRoot());
+            builder.startGroup().cast(baseClassName(node)).startCall("copy").end().end();
+            builder.string("newNode");
+            builder.string("message");
+            builder.end();
+            builder.end();
+
+            return builder.getRoot();
+        }
+
+        private CodeExecutableElement createCreateSpecializationMethod(NodeData node, SpecializationGroup group) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PROTECTED, FINAL), new GeneratedTypeMirror(ElementUtils.getPackageName(node.getTemplateType()), baseClassName(node)),
+                            SPECIALIZE);
+            if (!node.needsFrame(getContext())) {
+                method.getAnnotationMirrors().add(new CodeAnnotationMirror(getContext().getTruffleTypes().getSlowPath()));
+            }
+
+            addInternalValueParameters(method, node.getGenericSpecialization(), node.needsFrame(getContext()), false);
+            final CodeTreeBuilder builder = method.createBuilder();
+            builder.tree(createExecuteTree(builder, node.getGenericSpecialization(), group, new CodeBlock<SpecializationData>() {
+
+                public CodeTree create(CodeTreeBuilder b, SpecializationData current) {
+                    return createCreateSpecializationMethodBody0(builder, current);
+                }
+            }, null, false, true, false, true));
+
+            emitUnreachableSpecializations(builder, node);
+
+            return method;
+        }
+
+        protected CodeTree createCreateSpecializationMethodBody0(CodeTreeBuilder parent, SpecializationData current) {
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            if (current.isGeneric()) {
+                builder.startReturn().nullLiteral().end();
+            } else {
+                String className = nodeSpecializationClassName(current);
+                if (!current.getExcludedBy().isEmpty()) {
+                    builder.startIf().string("!").startStaticCall(context.getTruffleTypes().getDslShare(), "isExcluded");
+                    builder.string("this").string(nodeSpecializationClassName(current), ".", METADATA_FIELD_NAME).end().end();
+                    builder.startBlock();
+                }
+
+                if (current.getNode().getGenericSpecialization().isReachable()) {
+                    builder.startStatement().startStaticCall(context.getTruffleTypes().getCompilerDirectives(), "transferToInterpreterAndInvalidate").end().end();
+                }
+                builder.startReturn();
+                builder.cast(baseClassName(getModel().getNode()));
+                builder.startGroup().startCall(className, FACTORY_METHOD_NAME).string("this");
+                for (Parameter param : current.getSignatureParameters()) {
+                    NodeChildData child = param.getSpecification().getExecution().getChild();
+                    List<TypeData> types = child.getNodeData().getTypeSystem().lookupSourceTypes(param.getTypeSystemType());
+                    if (types.size() > 1) {
+                        builder.string(implicitTypeName(param));
+                    }
+                }
+                builder.end().end();
+                builder.end();
+
+                if (!current.getExcludedBy().isEmpty()) {
+                    builder.end();
+                }
+            }
+            return builder.getRoot();
+
+        }
+
+        private void emitUnreachableSpecializations(final CodeTreeBuilder builder, NodeData node) {
+            for (SpecializationData current : node.getSpecializations()) {
+                if (current.isReachable()) {
+                    continue;
+                }
+                builder.string("// unreachable ").string(current.getId()).newLine();
+            }
+        }
+
+        protected CodeTree createExecuteTree(CodeTreeBuilder outerParent, final SpecializationData source, final SpecializationGroup group, final CodeBlock<SpecializationData> guardedblock,
+                        final CodeTree elseBlock, boolean forceElse, final boolean emitAssumptions, final boolean typedCasts, final boolean castForGuardsOnly) {
+            return guard(outerParent, source, group, new CodeBlock<Integer>() {
+
+                public CodeTree create(CodeTreeBuilder parent, Integer ifCount) {
+                    CodeTreeBuilder builder = parent.create();
+
+                    if (group.getSpecialization() != null) {
+                        builder.tree(guardedblock.create(builder, group.getSpecialization()));
+
+                        assert group.getChildren().isEmpty() : "missed a specialization";
+
+                    } else {
+                        for (SpecializationGroup childGroup : group.getChildren()) {
+                            builder.tree(createExecuteTree(builder, source, childGroup, guardedblock, null, false, emitAssumptions, typedCasts, castForGuardsOnly));
+                        }
+                    }
+
+                    return builder.getRoot();
+                }
+            }, elseBlock, forceElse, emitAssumptions, typedCasts, castForGuardsOnly);
+        }
+
+        private CodeTree guard(CodeTreeBuilder parent, SpecializationData source, SpecializationGroup group, CodeBlock<Integer> bodyBlock, CodeTree elseBlock, boolean forceElse,
+                        boolean emitAssumptions, boolean typedCasts, boolean castForGuardsOnly) {
+            CodeTreeBuilder builder = parent.create();
+
+            int ifCount = emitGuards(builder, source, group, emitAssumptions, typedCasts, castForGuardsOnly);
+
+            if (isReachableGroup(group, ifCount)) {
+                builder.tree(bodyBlock.create(builder, ifCount));
+            }
+
+            builder.end(ifCount);
+
+            if (elseBlock != null) {
+                if (ifCount > 0 || forceElse) {
+                    builder.tree(elseBlock);
+                }
+            }
+
+            return builder.getRoot();
+        }
+
+        private boolean isReachableGroup(SpecializationGroup group, int ifCount) {
+            if (ifCount != 0) {
+                return true;
+            }
+            SpecializationGroup previous = group.getPreviousGroup();
+            if (previous == null || previous.findElseConnectableGuards().isEmpty()) {
+                return true;
+            }
+
+            /*
+             * Hacky else case. In this case the specialization is not reachable due to previous
+             * else branch. This is only true if the minimum state is not checked.
+             */
+            if (previous.getGuards().size() == 1 && previous.getTypeGuards().isEmpty() && previous.getAssumptions().isEmpty() &&
+                            (previous.getParent() == null || previous.getMaxSpecializationIndex() != previous.getParent().getMaxSpecializationIndex())) {
+                return false;
+            }
+
+            return true;
+        }
+
+        private int emitGuards(CodeTreeBuilder builder, SpecializationData source, SpecializationGroup group, boolean emitAssumptions, boolean typedCasts, boolean castForGuardsOnly) {
+            NodeData node = source.getNode();
+
+            CodeTreeBuilder guardsBuilder = builder.create();
+            CodeTreeBuilder castBuilder = builder.create();
+            CodeTreeBuilder guardsCastBuilder = builder.create();
+
+            String guardsAnd = "";
+            String guardsCastAnd = "";
+
+            if (emitAssumptions) {
+                for (String assumption : group.getAssumptions()) {
+                    guardsBuilder.string(guardsAnd);
+                    guardsBuilder.string("this");
+                    guardsBuilder.string(".").string(assumption).string(".isValid()");
+                    guardsAnd = " && ";
+                }
+            }
+
+            for (TypeGuard typeGuard : group.getTypeGuards()) {
+                Parameter valueParam = source.getSignatureParameter(typeGuard.getSignatureIndex());
+
+                if (valueParam == null) {
+                    /*
+                     * If used inside a execute evaluated method then the value param may not exist.
+                     * In that case we assume that the value is executed generic or of the current
+                     * specialization.
+                     */
+                    if (group.getSpecialization() != null) {
+                        valueParam = group.getSpecialization().getSignatureParameter(typeGuard.getSignatureIndex());
+                    } else {
+                        valueParam = node.getGenericSpecialization().getSignatureParameter(typeGuard.getSignatureIndex());
+                    }
+                }
+
+                NodeExecutionData execution = valueParam.getSpecification().getExecution();
+                CodeTree implicitGuard = createTypeGuard(guardsBuilder, execution, valueParam, typeGuard.getType(), typedCasts);
+                if (implicitGuard != null) {
+                    guardsBuilder.string(guardsAnd);
+                    guardsBuilder.tree(implicitGuard);
+                    guardsAnd = " && ";
+                }
+
+                CodeTree implicitGetType = null;
+                if (castForGuardsOnly) {
+                    implicitGetType = createGetImplicitType(builder, execution, valueParam, typeGuard.getType());
+                }
+
+                boolean performCast = true;
+                if (castForGuardsOnly) {
+                    // if cast for guards we just cast if the type guard is used inside a guard.
+                    performCast = group.isTypeGuardUsedInAnyGuardBelow(context, source, typeGuard);
+                }
+
+                if (performCast) {
+                    CodeTree cast = createCast(castBuilder, execution, valueParam, typeGuard.getType(), typedCasts);
+                    if (cast != null) {
+                        castBuilder.tree(cast);
+                    }
+                }
+                if (implicitGetType != null) {
+                    castBuilder.tree(implicitGetType);
+                }
+            }
+            List<GuardExpression> elseGuards = group.findElseConnectableGuards();
+
+            for (GuardExpression guard : group.getGuards()) {
+                if (elseGuards.contains(guard)) {
+                    continue;
+                }
+
+                if (needsTypeGuard(source, group, guard)) {
+                    guardsCastBuilder.tree(createMethodGuard(builder, guardsCastAnd, source, guard));
+                    guardsCastAnd = " && ";
+                } else {
+                    guardsBuilder.tree(createMethodGuard(builder, guardsAnd, source, guard));
+                    guardsAnd = " && ";
+                }
+            }
+
+            int ifCount = startGuardIf(builder, guardsBuilder, 0, elseGuards);
+            builder.tree(castBuilder.getRoot());
+            ifCount = startGuardIf(builder, guardsCastBuilder, ifCount, elseGuards);
+            return ifCount;
+        }
+
+        private int startGuardIf(CodeTreeBuilder builder, CodeTreeBuilder conditionBuilder, int ifCount, List<GuardExpression> elseGuard) {
+            int newIfCount = ifCount;
+
+            if (!conditionBuilder.isEmpty()) {
+                if (ifCount == 0 && !elseGuard.isEmpty()) {
+                    builder.startElseIf();
+                } else {
+                    builder.startIf();
+                }
+                builder.tree(conditionBuilder.getRoot());
+                builder.end().startBlock();
+                newIfCount++;
+            } else if (ifCount == 0 && !elseGuard.isEmpty()) {
+                builder.startElseBlock();
+                newIfCount++;
+            }
+            return newIfCount;
+        }
+
+        private boolean needsTypeGuard(SpecializationData source, SpecializationGroup group, GuardExpression guard) {
+            int signatureIndex = 0;
+            for (Parameter parameter : guard.getResolvedGuard().getParameters()) {
+                if (!parameter.getSpecification().isSignature()) {
+                    continue;
+                }
+
+                TypeGuard typeGuard = group.findTypeGuard(signatureIndex);
+                if (typeGuard != null) {
+                    TypeData requiredType = typeGuard.getType();
+
+                    Parameter sourceParameter = source.findParameter(parameter.getLocalName());
+                    if (sourceParameter == null) {
+                        sourceParameter = source.getNode().getGenericSpecialization().findParameter(parameter.getLocalName());
+                    }
+
+                    if (ElementUtils.needsCastTo(sourceParameter.getType(), requiredType.getPrimitiveType())) {
+                        return true;
+                    }
+                }
+
+                signatureIndex++;
+            }
+            return false;
+        }
+
+        private CodeTree createTypeGuard(CodeTreeBuilder parent, NodeExecutionData execution, Parameter source, TypeData targetType, boolean typedCasts) {
+            NodeData node = execution.getChild().getNodeData();
+
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+
+            TypeData sourceType = source.getTypeSystemType();
+
+            if (!sourceType.needsCastTo(targetType)) {
+                return null;
+            }
+
+            builder.startGroup();
+
+            if (execution.isShortCircuit()) {
+                Parameter shortCircuit = source.getPreviousParameter();
+                assert shortCircuit != null;
+                builder.string("(");
+                builder.string("!").string(valueName(shortCircuit));
+                builder.string(" || ");
+            }
+
+            String castMethodName;
+            String castTypeName = null;
+            List<TypeData> types = getModel().getNode().getTypeSystem().lookupSourceTypes(targetType);
+            if (types.size() > 1) {
+                castMethodName = TypeSystemCodeGenerator.isImplicitTypeMethodName(targetType);
+                if (typedCasts) {
+                    castTypeName = implicitTypeName(source);
+                }
+            } else {
+                castMethodName = TypeSystemCodeGenerator.isTypeMethodName(targetType);
+            }
+
+            startCallTypeSystemMethod(builder, node.getTypeSystem(), castMethodName);
+            builder.string(valueName(source));
+            if (castTypeName != null) {
+                builder.string(castTypeName);
+            }
+            builder.end().end(); // call
+
+            if (execution.isShortCircuit()) {
+                builder.string(")");
+            }
+
+            builder.end(); // group
+
+            return builder.getRoot();
+        }
+
+        // TODO merge redundancies with #createTypeGuard
+        private CodeTree createCast(CodeTreeBuilder parent, NodeExecutionData execution, Parameter source, TypeData targetType, boolean typedCasts) {
+            NodeData node = execution.getChild().getNodeData();
+            TypeData sourceType = source.getTypeSystemType();
+
+            if (!sourceType.needsCastTo(targetType)) {
+                return null;
+            }
+
+            CodeTree condition = null;
+            if (execution.isShortCircuit()) {
+                Parameter shortCircuit = source.getPreviousParameter();
+                assert shortCircuit != null;
+                condition = CodeTreeBuilder.singleString(valueName(shortCircuit));
+            }
+
+            String castMethodName;
+            String castTypeName = null;
+            List<TypeData> types = getModel().getNode().getTypeSystem().lookupSourceTypes(targetType);
+            if (types.size() > 1) {
+                castMethodName = TypeSystemCodeGenerator.asImplicitTypeMethodName(targetType);
+                if (typedCasts) {
+                    castTypeName = implicitTypeName(source);
+                }
+            } else {
+                castMethodName = TypeSystemCodeGenerator.asTypeMethodName(targetType);
+            }
+
+            List<CodeTree> args = new ArrayList<>();
+            args.add(CodeTreeBuilder.singleString(valueName(source)));
+            if (castTypeName != null) {
+                args.add(CodeTreeBuilder.singleString(castTypeName));
+            }
+
+            CodeTree cast = createCallTypeSystemMethod(parent, node, castMethodName, args.toArray(new CodeTree[0]));
+
+            CodeTreeBuilder builder = parent.create();
+            builder.tree(createLazyAssignment(parent, castValueName(source), targetType.getPrimitiveType(), condition, cast));
+
+            return builder.getRoot();
+        }
+
+        private CodeTree createGetImplicitType(CodeTreeBuilder parent, NodeExecutionData execution, Parameter source, TypeData targetType) {
+            CodeTree condition = null;
+            if (execution.isShortCircuit()) {
+                Parameter shortCircuit = source.getPreviousParameter();
+                assert shortCircuit != null;
+                condition = CodeTreeBuilder.singleString(valueName(shortCircuit));
+            }
+
+            CodeTreeBuilder builder = parent.create();
+            List<TypeData> types = getModel().getNode().getTypeSystem().lookupSourceTypes(targetType);
+            if (types.size() > 1) {
+                CodeTree castType = createCallTypeSystemMethod(parent, execution.getChild().getNodeData(), TypeSystemCodeGenerator.getImplicitClass(targetType),
+                                CodeTreeBuilder.singleString(valueName(source)));
+                builder.tree(createLazyAssignment(builder, implicitTypeName(source), getContext().getType(Class.class), condition, castType));
+            }
+            return builder.getRoot();
+        }
+
+        private CodeTree createMethodGuard(CodeTreeBuilder parent, String prefix, SpecializationData source, GuardExpression guard) {
+            CodeTreeBuilder builder = parent.create();
+            builder.string(prefix);
+            if (guard.isNegated()) {
+                builder.string("!");
+            }
+            builder.tree(createTemplateMethodCall(builder, null, source, guard.getResolvedGuard(), null));
+            return builder.getRoot();
+        }
+
+        protected CodeTree createGenericInvoke(CodeTreeBuilder parent, SpecializationData source, SpecializationData current) {
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+
+            if (current.getMethod() == null) {
+                emitEncounteredSynthetic(builder, current);
+            } else {
+                builder.startReturn().tree(createTemplateMethodCall(builder, null, source, current, null)).end();
+            }
+
+            return encloseThrowsWithFallThrough(current, builder.getRoot());
+        }
+
+        private CodeTree encloseThrowsWithFallThrough(SpecializationData current, CodeTree tree) {
+            if (current.getExceptions().isEmpty()) {
+                return tree;
+            }
+            CodeTreeBuilder builder = new CodeTreeBuilder(null);
+
+            builder.startTryBlock();
+            builder.tree(tree);
+            for (SpecializationThrowsData exception : current.getExceptions()) {
+                builder.end().startCatchBlock(exception.getJavaClass(), "rewriteEx");
+                builder.tree(createDeoptimize(builder));
+                builder.tree(createCallRewriteMonomorphic(builder, false, current.getNode().getGenericSpecialization().getReturnType().getTypeSystemType(), current, null,
+                                "Thrown " + ElementUtils.getSimpleName(exception.getJavaClass())));
+            }
+            builder.end();
+
+            return builder.getRoot();
+        }
+
+        protected CodeTree createCastingExecute(CodeTreeBuilder parent, SpecializationData specialization, ExecutableTypeData executable, ExecutableTypeData castExecutable) {
+            TypeData type = executable.getType();
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            NodeData node = specialization.getNode();
+
+            TypeData primaryType = castExecutable.getType();
+
+            boolean needsTry = castExecutable.hasUnexpectedValue(getContext());
+            boolean returnVoid = type.isVoid();
+
+            List<Parameter> executeParameters = new ArrayList<>();
+            for (Parameter sourceParameter : executable.getSignatureParameters()) {
+                Parameter targetParameter = castExecutable.findParameter(sourceParameter.getLocalName());
+                if (targetParameter != null) {
+                    executeParameters.add(targetParameter);
+                }
+            }
+
+            // execute names are enforced no cast
+            String[] executeParameterNames = new String[executeParameters.size()];
+            for (int i = 0; i < executeParameterNames.length; i++) {
+                executeParameterNames[i] = valueName(executeParameters.get(i));
+            }
+
+            builder.tree(createExecuteChildren(builder, executable, specialization, executeParameters, null));
+            boolean hasUnexpected = executable.hasUnexpectedValue(getContext());
+
+            CodeTree primaryExecuteCall = createTemplateMethodCall(builder, null, executable, castExecutable, null, executeParameterNames);
+            if (needsTry) {
+                if (!returnVoid) {
+                    builder.declaration(primaryType.getPrimitiveType(), "value");
+                }
+                builder.startTryBlock();
+
+                if (returnVoid) {
+                    builder.statement(primaryExecuteCall);
+                } else {
+                    builder.startStatement();
+                    builder.string("value = ");
+                    builder.tree(primaryExecuteCall);
+                    builder.end();
+                }
+
+                builder.end().startCatchBlock(getUnexpectedValueException(), "ex");
+                if (returnVoid) {
+                    builder.string("// ignore").newLine();
+                } else {
+                    builder.startReturn();
+                    builder.tree(createExpectExecutableType(node, specialization.getNode().getTypeSystem().getGenericTypeData(), hasUnexpected, executable.getType(),
+                                    CodeTreeBuilder.singleString("ex.getResult()")));
+                    builder.end();
+                }
+                builder.end();
+
+                if (!returnVoid) {
+                    builder.startReturn();
+                    builder.tree(createExpectExecutableType(node, castExecutable.getReturnType().getTypeSystemType(), hasUnexpected, executable.getType(), CodeTreeBuilder.singleString("value")));
+                    builder.end();
+                }
+            } else {
+                if (returnVoid) {
+                    builder.statement(primaryExecuteCall);
+                } else {
+                    builder.startReturn();
+                    builder.tree(createExpectExecutableType(node, castExecutable.getReturnType().getTypeSystemType(), hasUnexpected, executable.getType(), primaryExecuteCall));
+                    builder.end();
+                }
+            }
+
+            return builder.getRoot();
+        }
+
+        protected CodeTree createExpectExecutableType(NodeData node, TypeData sourceType, boolean hasUnexpected, TypeData exepctedType, CodeTree value) {
+            return createCastType(node.getTypeSystem(), sourceType, exepctedType, hasUnexpected, value);
+        }
+
+        protected CodeTree createExecuteChildren(CodeTreeBuilder parent, ExecutableTypeData sourceExecutable, SpecializationData specialization, List<Parameter> targetParameters,
+                        Parameter unexpectedParameter) {
+            CodeTreeBuilder builder = parent.create();
+            for (Parameter targetParameter : targetParameters) {
+                if (!targetParameter.getSpecification().isSignature()) {
+                    continue;
+                }
+                NodeExecutionData execution = targetParameter.getSpecification().getExecution();
+                CodeTree executionExpressions = createExecuteChild(builder, execution, sourceExecutable, targetParameter, unexpectedParameter);
+                CodeTree unexpectedTree = createCatchUnexpectedTree(builder, executionExpressions, specialization, sourceExecutable, targetParameter, execution.isShortCircuit(), unexpectedParameter);
+                CodeTree shortCircuitTree = createShortCircuitTree(builder, unexpectedTree, specialization, targetParameter, unexpectedParameter);
+
+                if (shortCircuitTree == executionExpressions) {
+                    if (containsNewLine(executionExpressions)) {
+                        builder.declaration(targetParameter.getType(), valueName(targetParameter));
+                        builder.tree(shortCircuitTree);
+                    } else {
+                        builder.startStatement().type(targetParameter.getType()).string(" ").tree(shortCircuitTree).end();
+                    }
+                } else {
+                    builder.tree(shortCircuitTree);
+                }
+
+            }
+            return builder.getRoot();
+        }
+
+        private ExecutableTypeData resolveExecutableType(NodeExecutionData execution, TypeData type) {
+            ExecutableTypeData targetExecutable = execution.getChild().findExecutableType(getContext(), type);
+            if (targetExecutable == null) {
+                targetExecutable = execution.getChild().findAnyGenericExecutableType(getContext());
+            }
+            return targetExecutable;
+        }
+
+        private CodeTree createExecuteChild(CodeTreeBuilder parent, NodeExecutionData execution, ExecutableTypeData sourceExecutable, Parameter targetParameter, Parameter unexpectedParameter) {
+            SpecializationData specialization = getModel();
+            TreeSet<TypeData> possiblePolymorphicTypes = lookupPolymorphicTargetTypes(targetParameter);
+            if (specialization.isPolymorphic() && targetParameter.getTypeSystemType().isGeneric() && unexpectedParameter == null && possiblePolymorphicTypes.size() > 1) {
+
+                CodeTreeBuilder builder = parent.create();
+
+                boolean elseIf = false;
+                for (TypeData possiblePolymoprhicType : possiblePolymorphicTypes) {
+                    if (possiblePolymoprhicType.isGeneric()) {
+                        continue;
+                    }
+                    elseIf = builder.startIf(elseIf);
+
+                    Parameter sourceParameter = sourceExecutable.findParameter(targetParameter.getLocalName());
+                    TypeData sourceType = sourceParameter != null ? sourceParameter.getTypeSystemType() : null;
+                    builder.string(polymorphicTypeName(targetParameter.getSpecification().getExecution())).string(" == ").typeLiteral(possiblePolymoprhicType.getPrimitiveType());
+                    builder.end().startBlock();
+                    builder.startStatement();
+                    builder.tree(createExecuteChildExpression(parent, execution, sourceType, new Parameter(targetParameter, possiblePolymoprhicType), unexpectedParameter, null));
+                    builder.end();
+                    builder.end();
+                }
+
+                builder.startElseBlock();
+                builder.startStatement().tree(createExecuteChildImplicit(parent, execution, sourceExecutable, targetParameter, unexpectedParameter)).end();
+                builder.end();
+
+                return builder.getRoot();
+            } else {
+                return createExecuteChildImplicit(parent, execution, sourceExecutable, targetParameter, unexpectedParameter);
+            }
+        }
+
+        protected final List<Parameter> getImplicitTypeParameters(SpecializationData model) {
+            List<Parameter> parameter = new ArrayList<>();
+            for (Parameter param : model.getSignatureParameters()) {
+                NodeChildData child = param.getSpecification().getExecution().getChild();
+                List<TypeData> types = child.getNodeData().getTypeSystem().lookupSourceTypes(param.getTypeSystemType());
+                if (types.size() > 1) {
+                    parameter.add(param);
+                }
+            }
+            return parameter;
+        }
+
+        protected final TreeSet<TypeData> lookupPolymorphicTargetTypes(Parameter param) {
+            SpecializationData specialization = getModel();
+            TreeSet<TypeData> possiblePolymorphicTypes = new TreeSet<>();
+            for (SpecializationData otherSpecialization : specialization.getNode().getSpecializations()) {
+                if (!otherSpecialization.isSpecialized()) {
+                    continue;
+                }
+                Parameter otherParameter = otherSpecialization.findParameter(param.getLocalName());
+                if (otherParameter != null) {
+                    possiblePolymorphicTypes.add(otherParameter.getTypeSystemType());
+                }
+            }
+            return possiblePolymorphicTypes;
+        }
+
+        private CodeTree createExecuteChildImplicit(CodeTreeBuilder parent, NodeExecutionData execution, ExecutableTypeData sourceExecutable, Parameter param, Parameter unexpectedParameter) {
+            CodeTreeBuilder builder = parent.create();
+            Parameter sourceParameter = sourceExecutable.findParameter(param.getLocalName());
+            String childExecuteName = createExecuteChildMethodName(param, sourceParameter != null);
+            if (childExecuteName != null) {
+                builder.string(valueName(param));
+                builder.string(" = ");
+                builder.startCall(childExecuteName);
+
+                for (Parameter parameters : sourceExecutable.getParameters()) {
+                    if (parameters.getSpecification().isSignature()) {
+                        continue;
+                    }
+                    builder.string(parameters.getLocalName());
+                }
+
+                if (sourceParameter != null) {
+                    builder.string(valueNameEvaluated(sourceParameter));
+                }
+
+                builder.string(implicitTypeName(param));
+
+                builder.end();
+            } else {
+                List<TypeData> sourceTypes = execution.getChild().getNodeData().getTypeSystem().lookupSourceTypes(param.getTypeSystemType());
+                TypeData expectType = sourceParameter != null ? sourceParameter.getTypeSystemType() : null;
+                if (sourceTypes.size() > 1) {
+                    builder.tree(createExecuteChildImplicitExpressions(parent, param, expectType));
+                } else {
+                    builder.tree(createExecuteChildExpression(parent, execution, expectType, param, unexpectedParameter, null));
+                }
+            }
+            return builder.getRoot();
+        }
+
+        private String createExecuteChildMethodName(Parameter param, boolean expect) {
+            NodeExecutionData execution = param.getSpecification().getExecution();
+            NodeChildData child = execution.getChild();
+            if (child.getExecuteWith().size() > 0) {
+                return null;
+            }
+            List<TypeData> sourceTypes = child.getNodeData().getTypeSystem().lookupSourceTypes(param.getTypeSystemType());
+            if (sourceTypes.size() <= 1) {
+                return null;
+            }
+            String prefix = expect ? "expect" : "execute";
+            String suffix = execution.getIndex() > -1 ? String.valueOf(execution.getIndex()) : "";
+            return prefix + ElementUtils.firstLetterUpperCase(child.getName()) + ElementUtils.firstLetterUpperCase(ElementUtils.getSimpleName(param.getType())) + suffix;
+        }
+
+        private List<CodeExecutableElement> createExecuteChilds(Parameter param, Set<TypeData> expectTypes) {
+            CodeExecutableElement executeMethod = createExecuteChild(param, null);
+            if (executeMethod == null) {
+                return Collections.emptyList();
+            }
+            List<CodeExecutableElement> childs = new ArrayList<>();
+            childs.add(executeMethod);
+
+            for (TypeData expectType : expectTypes) {
+                CodeExecutableElement method = createExecuteChild(param, expectType);
+                if (method != null) {
+                    childs.add(method);
+                }
+            }
+            return childs;
+        }
+
+        private CodeExecutableElement createExecuteChild(Parameter param, TypeData expectType) {
+            String childExecuteName = createExecuteChildMethodName(param, expectType != null);
+            if (childExecuteName == null) {
+                return null;
+            }
+
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PROTECTED, expectType != null ? STATIC : FINAL), param.getType(), childExecuteName);
+            method.getThrownTypes().add(getContext().getTruffleTypes().getUnexpectedValueException());
+            method.addParameter(new CodeVariableElement(getContext().getTruffleTypes().getFrame(), "frameValue"));
+            if (expectType != null) {
+                method.addParameter(new CodeVariableElement(expectType.getPrimitiveType(), valueNameEvaluated(param)));
+            }
+            method.addParameter(new CodeVariableElement(getContext().getType(Class.class), implicitTypeName(param)));
+
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.declaration(param.getType(), valueName(param));
+            builder.tree(createExecuteChildImplicitExpressions(builder, param, expectType));
+            builder.startReturn().string(valueName(param)).end();
+
+            return method;
+        }
+
+        private CodeTree createExecuteChildImplicitExpressions(CodeTreeBuilder parent, Parameter targetParameter, TypeData expectType) {
+            CodeTreeBuilder builder = parent.create();
+            NodeData node = getModel().getNode();
+            NodeExecutionData execution = targetParameter.getSpecification().getExecution();
+            List<TypeData> sourceTypes = node.getTypeSystem().lookupSourceTypes(targetParameter.getTypeSystemType());
+            boolean elseIf = false;
+            int index = 0;
+            for (TypeData sourceType : sourceTypes) {
+                if (index < sourceTypes.size() - 1) {
+                    elseIf = builder.startIf(elseIf);
+                    builder.string(implicitTypeName(targetParameter)).string(" == ").typeLiteral(sourceType.getPrimitiveType());
+                    builder.end();
+                    builder.startBlock();
+                } else {
+                    builder.startElseBlock();
+                }
+
+                ExecutableTypeData implictExecutableTypeData = execution.getChild().findExecutableType(getContext(), sourceType);
+                if (implictExecutableTypeData == null) {
+                    /*
+                     * For children with executeWith.size() > 0 an executable type may not exist so
+                     * use the generic executable type which is guaranteed to exist. An expect call
+                     * is inserted automatically by #createExecuteExpression.
+                     */
+                    implictExecutableTypeData = execution.getChild().getNodeData().findExecutableType(node.getTypeSystem().getGenericTypeData(), execution.getChild().getExecuteWith().size());
+                }
+
+                ImplicitCastData cast = execution.getChild().getNodeData().getTypeSystem().lookupCast(sourceType, targetParameter.getTypeSystemType());
+                CodeTree execute = createExecuteChildExpression(builder, execution, expectType, targetParameter, null, cast);
+                builder.statement(execute);
+                builder.end();
+                index++;
+            }
+            return builder.getRoot();
+        }
+
+        private CodeTree createExecuteChildExpression(CodeTreeBuilder parent, NodeExecutionData execution, TypeData sourceParameterType, Parameter targetParameter, Parameter unexpectedParameter,
+                        ImplicitCastData cast) {
+            // assignments: targetType <- castTargetType <- castSourceType <- sourceType
+            TypeData sourceType = sourceParameterType;
+            TypeData targetType = targetParameter.getTypeSystemType();
+            TypeData castSourceType = targetType;
+            TypeData castTargetType = targetType;
+
+            if (cast != null) {
+                castSourceType = cast.getSourceType();
+                castTargetType = cast.getTargetType();
+            }
+
+            CodeTree expression;
+            if (sourceType == null) {
+                ExecutableTypeData targetExecutable = resolveExecutableType(execution, castSourceType);
+                expression = createExecuteChildExpression(parent, execution, targetExecutable, unexpectedParameter);
+                sourceType = targetExecutable.getType();
+            } else {
+                expression = CodeTreeBuilder.singleString(valueNameEvaluated(targetParameter));
+            }
+
+            // target = expectTargetType(implicitCast(expectCastSourceType(source)))
+            TypeSystemData typeSystem = execution.getChild().getNodeData().getTypeSystem();
+            expression = createExpectType(typeSystem, sourceType, castSourceType, expression);
+            expression = createImplicitCast(parent, typeSystem, cast, expression);
+            expression = createExpectType(typeSystem, castTargetType, targetType, expression);
+
+            CodeTreeBuilder builder = parent.create();
+            builder.string(valueName(targetParameter));
+            builder.string(" = ");
+            builder.tree(expression);
+            return builder.getRoot();
+        }
+
+        private CodeTree createImplicitCast(CodeTreeBuilder parent, TypeSystemData typeSystem, ImplicitCastData cast, CodeTree expression) {
+            if (cast == null) {
+                return expression;
+            }
+            CodeTreeBuilder builder = parent.create();
+            startCallTypeSystemMethod(builder, typeSystem, cast.getMethodName());
+            builder.tree(expression);
+            builder.end().end();
+            return builder.getRoot();
+        }
+
+        private boolean containsNewLine(CodeTree tree) {
+            if (tree.getCodeKind() == CodeTreeKind.NEW_LINE) {
+                return true;
+            }
+
+            for (CodeTree codeTree : tree.getEnclosedElements()) {
+                if (containsNewLine(codeTree)) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        private boolean hasUnexpected(Parameter sourceParameter, Parameter targetParameter, Parameter unexpectedParameter) {
+            NodeExecutionData execution = targetParameter.getSpecification().getExecution();
+
+            if (getModel().isPolymorphic() && targetParameter.getTypeSystemType().isGeneric() && unexpectedParameter == null) {
+                // check for other polymorphic types
+                TreeSet<TypeData> polymorphicTargetTypes = lookupPolymorphicTargetTypes(targetParameter);
+                if (polymorphicTargetTypes.size() > 1) {
+                    for (TypeData polymorphicTargetType : polymorphicTargetTypes) {
+                        if (hasUnexpectedType(execution, sourceParameter, polymorphicTargetType)) {
+                            return true;
+                        }
+                    }
+                }
+            }
+
+            if (hasUnexpectedType(execution, sourceParameter, targetParameter.getTypeSystemType())) {
+                return true;
+            }
+            return false;
+        }
+
+        private boolean hasUnexpectedType(NodeExecutionData execution, Parameter sourceParameter, TypeData targetType) {
+            List<TypeData> implicitSourceTypes = getModel().getNode().getTypeSystem().lookupSourceTypes(targetType);
+
+            for (TypeData implicitSourceType : implicitSourceTypes) {
+                TypeData sourceType;
+                ExecutableTypeData targetExecutable = resolveExecutableType(execution, implicitSourceType);
+                if (sourceParameter != null) {
+                    sourceType = sourceParameter.getTypeSystemType();
+                } else {
+                    if (targetExecutable.hasUnexpectedValue(getContext())) {
+                        return true;
+                    }
+                    sourceType = targetExecutable.getType();
+                }
+
+                ImplicitCastData cast = getModel().getNode().getTypeSystem().lookupCast(implicitSourceType, targetType);
+                if (cast != null) {
+                    if (cast.getSourceType().needsCastTo(targetType)) {
+                        return true;
+                    }
+                }
+
+                if (sourceType.needsCastTo(targetType)) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        private CodeTree createCatchUnexpectedTree(CodeTreeBuilder parent, CodeTree body, SpecializationData specialization, ExecutableTypeData currentExecutable, Parameter param,
+                        boolean shortCircuit, Parameter unexpectedParameter) {
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            Parameter sourceParameter = currentExecutable.findParameter(param.getLocalName());
+            boolean unexpected = hasUnexpected(sourceParameter, param, unexpectedParameter);
+            if (!unexpected) {
+                return body;
+            }
+
+            if (!shortCircuit) {
+                builder.declaration(param.getType(), valueName(param));
+            }
+            builder.startTryBlock();
+
+            if (containsNewLine(body)) {
+                builder.tree(body);
+            } else {
+                builder.statement(body);
+            }
+
+            builder.end().startCatchBlock(getUnexpectedValueException(), "ex");
+            SpecializationData generic = specialization.getNode().getGenericSpecialization();
+            Parameter genericParameter = generic.findParameter(param.getLocalName());
+
+            List<Parameter> genericParameters = generic.getParametersAfter(genericParameter);
+            builder.tree(createExecuteChildren(parent, currentExecutable, generic, genericParameters, genericParameter));
+            if (specialization.isPolymorphic()) {
+                builder.tree(createReturnOptimizeTypes(builder, currentExecutable, specialization, param));
+            } else {
+                builder.tree(createCallRewriteMonomorphic(builder, currentExecutable.hasUnexpectedValue(context), currentExecutable.getType(), specialization, param,
+                                "Expected " + param.getLocalName() + " instanceof " + ElementUtils.getSimpleName(param.getType())));
+            }
+            builder.end(); // catch block
+
+            return builder.getRoot();
+        }
+
+        private CodeTree createReturnOptimizeTypes(CodeTreeBuilder parent, ExecutableTypeData currentExecutable, SpecializationData specialization, Parameter param) {
+            NodeData node = specialization.getNode();
+            SpecializationData polymorphic = node.getPolymorphicSpecialization();
+
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            builder.startStatement().string(polymorphicTypeName(param.getSpecification().getExecution())).string(" = ").typeLiteral(getContext().getType(Object.class)).end();
+
+            builder.startReturn();
+
+            CodeTreeBuilder execute = new CodeTreeBuilder(builder);
+            execute.startCall("next0", EXECUTE_CHAINED);
+            addInternalValueParameterNames(execute, specialization, polymorphic, param.getLocalName(), true, null);
+            execute.end();
+
+            TypeData sourceType = polymorphic.getReturnType().getTypeSystemType();
+
+            builder.tree(createExpectExecutableType(node, sourceType, currentExecutable.hasUnexpectedValue(context), currentExecutable.getType(), execute.getRoot()));
+
+            builder.end();
+            return builder.getRoot();
+        }
+
+        private CodeTree createExecuteChildExpression(CodeTreeBuilder parent, NodeExecutionData targetExecution, ExecutableTypeData targetExecutable, Parameter unexpectedParameter) {
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            if (targetExecution != null) {
+                builder.tree(createAccessChild(targetExecution, null));
+                builder.string(".");
+            }
+
+            builder.startCall(targetExecutable.getMethodName());
+
+            // TODO this should be merged with #createTemplateMethodCall
+            int index = 0;
+            for (Parameter parameter : targetExecutable.getParameters()) {
+
+                if (!parameter.getSpecification().isSignature()) {
+                    builder.string(parameter.getLocalName());
+                } else {
+
+                    if (index < targetExecution.getChild().getExecuteWith().size()) {
+                        NodeChildData child = targetExecution.getChild().getExecuteWith().get(index);
+
+                        ParameterSpec spec = getModel().getSpecification().findParameterSpec(child.getName());
+                        List<Parameter> specializationParams = getModel().findParameters(spec);
+
+                        if (specializationParams.isEmpty()) {
+                            builder.defaultValue(parameter.getType());
+                            continue;
+                        }
+
+                        Parameter specializationParam = specializationParams.get(0);
+
+                        TypeData targetType = parameter.getTypeSystemType();
+                        TypeData sourceType = specializationParam.getTypeSystemType();
+                        String localName = specializationParam.getLocalName();
+
+                        if (unexpectedParameter != null && unexpectedParameter.getLocalName().equals(specializationParam.getLocalName())) {
+                            localName = "ex.getResult()";
+                            sourceType = getModel().getNode().getTypeSystem().getGenericTypeData();
+                        }
+
+                        CodeTree value = CodeTreeBuilder.singleString(localName);
+
+                        if (sourceType.needsCastTo(targetType)) {
+                            value = createCallTypeSystemMethod(builder, getModel().getNode(), TypeSystemCodeGenerator.asTypeMethodName(targetType), value);
+                        }
+                        builder.tree(value);
+                    } else {
+                        builder.defaultValue(parameter.getType());
+                    }
+                    index++;
+                }
+            }
+
+            builder.end();
+
+            return builder.getRoot();
+        }
+
+        private CodeTree createShortCircuitTree(CodeTreeBuilder parent, CodeTree body, SpecializationData specialization, Parameter parameter, Parameter exceptionParam) {
+            NodeExecutionData execution = parameter.getSpecification().getExecution();
+            if (execution == null || !execution.isShortCircuit()) {
+                return body;
+            }
+
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            Parameter shortCircuitParam = specialization.getPreviousParam(parameter);
+            builder.tree(createShortCircuitValue(builder, specialization, execution, shortCircuitParam, exceptionParam));
+            builder.declaration(parameter.getType(), valueName(parameter), CodeTreeBuilder.createBuilder().defaultValue(parameter.getType()));
+            builder.startIf().string(shortCircuitParam.getLocalName()).end();
+            builder.startBlock();
+
+            if (containsNewLine(body)) {
+                builder.tree(body);
+            } else {
+                builder.statement(body);
+            }
+            builder.end();
+
+            return builder.getRoot();
+        }
+
+        private CodeTree createShortCircuitValue(CodeTreeBuilder parent, SpecializationData specialization, NodeExecutionData execution, Parameter shortCircuitParam, Parameter exceptionParam) {
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            int shortCircuitIndex = 0;
+            for (NodeExecutionData otherExectuion : specialization.getNode().getChildExecutions()) {
+                if (otherExectuion.isShortCircuit()) {
+                    if (otherExectuion == execution) {
+                        break;
+                    }
+                    shortCircuitIndex++;
+                }
+            }
+
+            builder.startStatement().type(shortCircuitParam.getType()).string(" ").string(valueName(shortCircuitParam)).string(" = ");
+            ShortCircuitData shortCircuitData = specialization.getShortCircuits().get(shortCircuitIndex);
+            builder.tree(createTemplateMethodCall(builder, null, specialization, shortCircuitData, exceptionParam != null ? exceptionParam.getLocalName() : null));
+            builder.end(); // statement
+
+            return builder.getRoot();
+        }
+
+        protected CodeTree createCallRewriteMonomorphic(CodeTreeBuilder parent, boolean hasUnexpected, TypeData returnType, SpecializationData current, Parameter exceptionParam, String reason) {
+            NodeData node = current.getNode();
+            SpecializationData generic = node.getGenericSpecialization();
+            CodeTreeBuilder specializeCall = new CodeTreeBuilder(parent);
+            specializeCall.startCall(REWRITE);
+            addInternalValueParameterNames(specializeCall, generic, node.getGenericSpecialization(), exceptionParam != null ? exceptionParam.getLocalName() : null, true, null);
+            specializeCall.doubleQuote(reason);
+            specializeCall.end().end();
+
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+
+            builder.startReturn();
+            builder.tree(createExpectExecutableType(node, generic.getReturnType().getTypeSystemType(), hasUnexpected, returnType, specializeCall.getRoot()));
+            builder.end();
+
+            return builder.getRoot();
+        }
+
+    }
+
+    private class PolymorphicNodeFactory extends SpecializedNodeFactory {
+
+        public PolymorphicNodeFactory(CodeTypeElement nodeGen) {
+            super(nodeGen);
+        }
+
+        @Override
+        public CodeTypeElement create(SpecializationData polymorph) {
+            NodeData node = polymorph.getNode();
+            TypeMirror baseType = node.getNodeType();
+            if (nodeGen != null) {
+                baseType = nodeGen.asType();
+            }
+            CodeTypeElement clazz = createClass(node, modifiers(PRIVATE, STATIC, FINAL), nodePolymorphicClassName(node), baseType, false);
+
+            clazz.getAnnotationMirrors().add(createNodeInfo(node, NodeCost.POLYMORPHIC));
+
+            for (Parameter polymorphParameter : polymorph.getSignatureParameters()) {
+                if (!polymorphParameter.getTypeSystemType().isGeneric()) {
+                    continue;
+                }
+                Set<TypeData> types = new HashSet<>();
+                for (SpecializationData specialization : node.getSpecializations()) {
+                    if (!specialization.isSpecialized()) {
+                        continue;
+                    }
+                    Parameter parameter = specialization.findParameter(polymorphParameter.getLocalName());
+                    assert parameter != null;
+                    types.add(parameter.getTypeSystemType());
+                }
+
+            }
+
+            for (NodeExecutionData execution : getModel().getNode().getChildExecutions()) {
+                String fieldName = polymorphicTypeName(execution);
+                CodeVariableElement var = new CodeVariableElement(modifiers(PRIVATE), getContext().getType(Class.class), fieldName);
+                var.getAnnotationMirrors().add(new CodeAnnotationMirror(getContext().getTruffleTypes().getCompilationFinal()));
+                clazz.add(var);
+            }
+
+            return clazz;
+        }
+
+        @Override
+        protected void createChildren(SpecializationData specialization) {
+            CodeTypeElement clazz = getElement();
+
+            createConstructors(clazz);
+            createExecuteMethods(specialization);
+
+            clazz.add(createUpdateTypes0());
+            createCachedExecuteMethods(specialization);
+        }
+
+    }
+
+    private class SpecializedNodeFactory extends NodeBaseFactory {
+
+        protected final CodeTypeElement nodeGen;
+
+        public SpecializedNodeFactory(CodeTypeElement nodeGen) {
+            this.nodeGen = nodeGen;
+        }
+
+        @Override
+        public CodeTypeElement create(SpecializationData specialization) {
+            NodeData node = specialization.getNode();
+            TypeMirror baseType = node.getNodeType();
+            if (nodeGen != null) {
+                baseType = nodeGen.asType();
+            }
+            CodeTypeElement clazz = createClass(node, modifiers(PRIVATE, STATIC, FINAL), nodeSpecializationClassName(specialization), baseType, false);
+
+            if (specialization.isSpecialized() || specialization.isUninitialized()) {
+                clazz.add(createGetMetadata0(false));
+                clazz.add(createMetadataLiteral());
+            }
+
+            NodeCost cost;
+            if (specialization.isGeneric()) {
+                cost = NodeCost.MEGAMORPHIC;
+            } else if (specialization.isUninitialized()) {
+                cost = NodeCost.UNINITIALIZED;
+            } else if (specialization.isPolymorphic()) {
+                cost = NodeCost.POLYMORPHIC;
+            } else if (specialization.isSpecialized()) {
+                cost = NodeCost.MONOMORPHIC;
+            } else {
+                throw new AssertionError();
+            }
+            clazz.getAnnotationMirrors().add(createNodeInfo(node, cost));
+
+            if (specialization.isUninitialized() && node.getGenericSpecialization().isReachable()) {
+                clazz.add(createUninitializedGetCostOverride());
+            }
+
+            return clazz;
+        }
+
+        private Element createUninitializedGetCostOverride() {
+            TypeMirror returnType = context.getTruffleTypes().getNodeCost();
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), returnType, "getCost");
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.startIf().string(CONTAINS_FALLBACK).end().startBlock();
+            builder.startReturn().staticReference(returnType, "MONOMORPHIC").end();
+            builder.end();
+            builder.startReturn().string("super.getCost()").end();
+            return method;
+        }
+
+        private CodeVariableElement createMetadataLiteral() {
+            CodeVariableElement includes = new CodeVariableElement(modifiers(PRIVATE, STATIC, FINAL), context.getTruffleTypes().getDslMetadata(), METADATA_FIELD_NAME);
+
+            CodeTreeBuilder builder = includes.createInitBuilder();
+
+            SpecializationData specialization = getModel();
+            NodeData node = specialization.getNode();
+
+            Set<SpecializationData> contains = specialization.getContains();
+            if (specialization.isUninitialized()) {
+                contains = new HashSet<>();
+
+                SpecializationData polymorphic = node.getPolymorphicSpecialization();
+                if (polymorphic != null) {
+                    contains.addAll(polymorphic.getContains());
+                }
+                SpecializationData generic = node.getGenericSpecialization();
+                if (generic != null) {
+                    contains.addAll(generic.getContains());
+                }
+            }
+
+            builder.startNew(context.getTruffleTypes().getDslMetadata());
+            builder.startGroup().string(nodeSpecializationClassName(getModel()), ".class").end();
+            builder.tree(createSpecializationListLiteral(builder, contains));
+            builder.tree(createSpecializationListLiteral(builder, getModel().getExcludedBy()));
+            builder.tree(createSpecializationTypeLiteral(builder, SpecializationData.getSignatureTypes(getModel())));
+            builder.string("0").string("0");
+            builder.end();
+            return includes;
+        }
+
+        private CodeTree createSpecializationTypeLiteral(CodeTreeBuilder parent, List<TypeMirror> list) {
+            ArrayType classArray = new ArrayCodeTypeMirror(context.getType(Class.class));
+            CodeTreeBuilder builder = parent.create();
+
+            if (list.isEmpty()) {
+                builder.staticReference(context.getTruffleTypes().getDslMetadata(), EMPTY_CLASS_ARRAY);
+            } else {
+                builder.startNewArray(classArray, null);
+                for (TypeMirror type : list) {
+                    builder.typeLiteral(type);
+                }
+                builder.end();
+            }
+
+            return builder.getRoot();
+        }
+
+        private CodeTree createSpecializationListLiteral(CodeTreeBuilder parent, Set<SpecializationData> list) {
+            ArrayType classArray = new ArrayCodeTypeMirror(context.getType(Class.class));
+            CodeTreeBuilder builder = parent.create();
+
+            if (list.isEmpty()) {
+                builder.staticReference(context.getTruffleTypes().getDslMetadata(), EMPTY_CLASS_ARRAY);
+            } else {
+                builder.startNewArray(classArray, null);
+                for (SpecializationData specialization : list) {
+                    if (specialization.isGeneric() || specialization.isPolymorphic()) {
+                        specialization = getModel().getNode().getUninitializedSpecialization();
+                    }
+                    builder.startGroup().string(nodeSpecializationClassName(specialization)).string(".class").end();
+                }
+                builder.end();
+            }
+
+            return builder.getRoot();
+        }
+
+        protected CodeAnnotationMirror createNodeInfo(NodeData node, NodeCost cost) {
+            String shortName = node.getShortName();
+            CodeAnnotationMirror nodeInfoMirror = new CodeAnnotationMirror(getContext().getTruffleTypes().getNodeInfoAnnotation());
+            if (shortName != null) {
+                nodeInfoMirror.setElementValue(nodeInfoMirror.findExecutableElement("shortName"), new CodeAnnotationValue(shortName));
+            }
+
+            DeclaredType nodeinfoCost = getContext().getTruffleTypes().getNodeCost();
+            VariableElement varKind = ElementUtils.findVariableElement(nodeinfoCost, cost.name());
+
+            nodeInfoMirror.setElementValue(nodeInfoMirror.findExecutableElement("cost"), new CodeAnnotationValue(varKind));
+            return nodeInfoMirror;
+        }
+
+        @Override
+        protected void createChildren(SpecializationData specialization) {
+            CodeTypeElement clazz = getElement();
+            createConstructors(clazz);
+
+            createExecuteMethods(specialization);
+            createCachedExecuteMethods(specialization);
+
+            if (specialization.isUninitialized()) {
+                if (specialization.getNode().isFallbackReachable()) {
+                    CodeVariableElement var = new CodeVariableElement(modifiers(Modifier.PRIVATE), context.getType(boolean.class), CONTAINS_FALLBACK);
+                    var.addAnnotationMirror(new CodeAnnotationMirror(context.getTruffleTypes().getCompilationFinal()));
+                    clazz.add(var);
+                }
+                clazz.add(createExecuteUninitialized());
+            }
+
+            if (!specialization.isUninitialized() && specialization.getNode().needsRewrites(context)) {
+                clazz.add(createCopyConstructorFactoryMethod(nodeGen.asType(), specialization));
+            } else {
+                for (ExecutableElement constructor : ElementFilter.constructorsIn(clazz.getEnclosedElements())) {
+                    if (constructor.getParameters().size() == 1 && ((CodeVariableElement) constructor.getParameters().get(0)).getType().equals(nodeGen.asType())) {
+                        // skip copy constructor - not used
+                        continue;
+                    }
+                    clazz.add(createConstructorFactoryMethod(specialization, constructor));
+                }
+            }
+        }
+
+        protected void createConstructors(CodeTypeElement clazz) {
+            TypeElement superTypeElement = ElementUtils.fromTypeMirror(clazz.getSuperclass());
+            SpecializationData specialization = getModel();
+            NodeData node = specialization.getNode();
+            for (ExecutableElement constructor : ElementFilter.constructorsIn(superTypeElement.getEnclosedElements())) {
+                if (specialization.isUninitialized()) {
+                    // ignore copy constructors for uninitialized if not polymorphic
+                    if (isCopyConstructor(constructor) && !node.isPolymorphic(context)) {
+                        continue;
+                    }
+                } else if (node.getUninitializedSpecialization() != null) {
+                    // ignore others than copy constructors for specialized nodes
+                    if (!isCopyConstructor(constructor)) {
+                        continue;
+                    }
+                }
+
+                CodeExecutableElement superConstructor = createSuperConstructor(clazz, constructor);
+                if (superConstructor == null) {
+                    continue;
+                }
+                CodeTree body = superConstructor.getBodyTree();
+                CodeTreeBuilder builder = superConstructor.createBuilder();
+                builder.tree(body);
+
+                if (superConstructor != null) {
+                    for (Parameter param : getImplicitTypeParameters(getModel())) {
+                        clazz.add(new CodeVariableElement(modifiers(PRIVATE, FINAL), getContext().getType(Class.class), implicitTypeName(param)));
+                        superConstructor.getParameters().add(new CodeVariableElement(getContext().getType(Class.class), implicitTypeName(param)));
+
+                        builder.startStatement();
+                        builder.string("this.").string(implicitTypeName(param)).string(" = ").string(implicitTypeName(param));
+                        builder.end();
+                    }
+
+                    clazz.add(superConstructor);
+                }
+            }
+        }
+
+        protected void createExecuteMethods(SpecializationData specialization) {
+            NodeData node = specialization.getNode();
+            CodeTypeElement clazz = getElement();
+
+            for (ExecutableTypeData execType : node.getExecutableTypes()) {
+                if (execType.isFinal()) {
+                    continue;
+                }
+                CodeExecutableElement executeMethod = createExecutableTypeOverride(execType, true);
+                clazz.add(executeMethod);
+                CodeTreeBuilder builder = executeMethod.getBuilder();
+                CodeTree result = createExecuteBody(builder, specialization, execType);
+                if (result != null) {
+                    builder.tree(result);
+                } else {
+                    clazz.remove(executeMethod);
+                }
+            }
+        }
+
+        protected void createCachedExecuteMethods(SpecializationData specialization) {
+            NodeData node = specialization.getNode();
+            if (!node.isPolymorphic(context)) {
+                return;
+            }
+
+            CodeTypeElement clazz = getElement();
+
+            final SpecializationData polymorphic = node.getPolymorphicSpecialization();
+            ExecutableElement executeCached = nodeGen.getMethod(EXECUTE_CHAINED);
+            CodeExecutableElement executeMethod = CodeExecutableElement.clone(getContext().getEnvironment(), executeCached);
+            executeMethod.getModifiers().remove(Modifier.ABSTRACT);
+            CodeTreeBuilder builder = executeMethod.createBuilder();
+
+            if (specialization.isPolymorphic()) {
+                builder.startReturn().startCall("this.next0", EXECUTE_CHAINED);
+                addInternalValueParameterNames(builder, polymorphic, polymorphic, null, true, null);
+                builder.end().end();
+            } else if (specialization.isUninitialized()) {
+                if (node.getGenericSpecialization().isReachable()) {
+                    builder.startIf().string("!containsFallback").end().startBlock();
+                    builder.startStatement().startStaticCall(context.getTruffleTypes().getCompilerDirectives(), "transferToInterpreterAndInvalidate").end().end();
+                    builder.end();
+                } else {
+                    builder.startStatement().startStaticCall(context.getTruffleTypes().getCompilerDirectives(), "transferToInterpreterAndInvalidate").end().end();
+                }
+                builder.startReturn().startCall("this", EXECUTE_UNINITIALIZED);
+                addInternalValueParameterNames(builder, polymorphic, polymorphic, null, true, null);
+                builder.end().end();
+            } else {
+                CodeTreeBuilder elseBuilder = new CodeTreeBuilder(builder);
+                elseBuilder.startReturn().startCall("this.next0", EXECUTE_CHAINED);
+                addInternalValueParameterNames(elseBuilder, polymorphic, polymorphic, null, true, null);
+                elseBuilder.end().end();
+
+                builder.tree(createExecuteTree(builder, polymorphic, SpecializationGroup.create(specialization), new CodeBlock<SpecializationData>() {
+
+                    public CodeTree create(CodeTreeBuilder b, SpecializationData current) {
+                        return createGenericInvoke(b, polymorphic, current);
+                    }
+                }, elseBuilder.getRoot(), false, true, true, false));
+            }
+            clazz.add(executeMethod);
+        }
+
+        private CodeTree createExecuteBody(CodeTreeBuilder parent, SpecializationData specialization, ExecutableTypeData execType) {
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+
+            List<ExecutableTypeData> primaryExecutes = findFunctionalExecutableType(specialization, execType.getEvaluatedCount());
+
+            if (primaryExecutes.contains(execType) || primaryExecutes.isEmpty()) {
+                builder.tree(createFunctionalExecute(builder, specialization, execType));
+            } else if (needsCastingExecuteMethod(execType)) {
+                assert !primaryExecutes.isEmpty();
+                builder.tree(createCastingExecute(builder, specialization, execType, primaryExecutes.get(0)));
+            } else {
+                return null;
+            }
+
+            return builder.getRoot();
+        }
+
+        private CodeExecutableElement createExecutableTypeOverride(ExecutableTypeData execType, boolean evaluated) {
+            CodeExecutableElement method = CodeExecutableElement.clone(getContext().getEnvironment(), execType.getMethod());
+
+            method.getAnnotationMirrors().clear();
+            for (VariableElement variable : method.getParameters()) {
+                variable.getAnnotationMirrors().clear();
+            }
+
+            CodeTreeBuilder builder = method.createBuilder();
+            int i = 0;
+            int signatureIndex = -1;
+            for (VariableElement param : method.getParameters()) {
+                CodeVariableElement var = CodeVariableElement.clone(param);
+                Parameter actualParameter = i < execType.getParameters().size() ? execType.getParameters().get(i) : null;
+                String name;
+                if (actualParameter != null) {
+                    if (actualParameter.getSpecification().isSignature()) {
+                        signatureIndex++;
+                    }
+
+                    if (evaluated && actualParameter.getSpecification().isSignature()) {
+                        name = valueNameEvaluated(actualParameter);
+                    } else {
+                        name = valueName(actualParameter);
+                    }
+
+                    int varArgCount = getModel().getSignatureSize() - signatureIndex;
+                    if (evaluated && actualParameter.isTypeVarArgs()) {
+                        Parameter baseVarArgs = actualParameter;
+                        name = valueName(baseVarArgs) + "Args";
+
+                        builder.startAssert().string(name).string(" != null").end();
+                        builder.startAssert().string(name).string(".length == ").string(String.valueOf(varArgCount)).end();
+                        if (varArgCount > 0) {
+                            List<Parameter> varArgsParameter = execType.getParameters().subList(i, execType.getParameters().size());
+                            for (Parameter varArg : varArgsParameter) {
+                                if (varArgCount <= 0) {
+                                    break;
+                                }
+                                TypeMirror type = baseVarArgs.getType();
+                                if (type.getKind() == TypeKind.ARRAY) {
+                                    type = ((ArrayType) type).getComponentType();
+                                }
+                                builder.declaration(type, valueNameEvaluated(varArg), name + "[" + varArg.getTypeVarArgsIndex() + "]");
+                                varArgCount--;
+                            }
+                        }
+                    }
+                } else {
+                    name = "arg" + i;
+                }
+                var.setName(name);
+                method.getParameters().set(i, var);
+                i++;
+            }
+
+            method.getAnnotationMirrors().clear();
+            method.getModifiers().remove(Modifier.ABSTRACT);
+            return method;
+        }
+
+        private boolean needsCastingExecuteMethod(ExecutableTypeData execType) {
+            if (execType.isAbstract()) {
+                return true;
+            }
+            if (execType.getType().isGeneric()) {
+                return true;
+            }
+            return false;
+        }
+
+        private List<ExecutableTypeData> findFunctionalExecutableType(SpecializationData specialization, int evaluatedCount) {
+            TypeData primaryType = specialization.getReturnType().getTypeSystemType();
+            List<ExecutableTypeData> otherTypes = specialization.getNode().getExecutableTypes(evaluatedCount);
+
+            List<ExecutableTypeData> filteredTypes = new ArrayList<>();
+            for (ExecutableTypeData compareType : otherTypes) {
+                if (!ElementUtils.typeEquals(compareType.getType().getPrimitiveType(), primaryType.getPrimitiveType())) {
+                    continue;
+                }
+                filteredTypes.add(compareType);
+            }
+
+            // no direct matches found use generic where the type is Object
+            if (filteredTypes.isEmpty()) {
+                for (ExecutableTypeData compareType : otherTypes) {
+                    if (compareType.getType().isGeneric() && !compareType.hasUnexpectedValue(getContext())) {
+                        filteredTypes.add(compareType);
+                    }
+                }
+            }
+
+            if (filteredTypes.isEmpty()) {
+                for (ExecutableTypeData compareType : otherTypes) {
+                    if (compareType.getType().isGeneric()) {
+                        filteredTypes.add(compareType);
+                    }
+                }
+            }
+
+            return filteredTypes;
+        }
+
+        private CodeTree createFunctionalExecute(CodeTreeBuilder parent, final SpecializationData specialization, final ExecutableTypeData executable) {
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            if (specialization.isUninitialized()) {
+                builder.tree(createDeoptimize(builder));
+            }
+
+            builder.tree(createExecuteChildren(builder, executable, specialization, specialization.getParameters(), null));
+
+            CodeTree returnSpecialized = null;
+
+            if (specialization.findNextSpecialization() != null) {
+                CodeTreeBuilder returnBuilder = new CodeTreeBuilder(builder);
+                returnBuilder.tree(createDeoptimize(builder));
+                returnBuilder.tree(createCallRewriteMonomorphic(builder, executable.hasUnexpectedValue(context), executable.getType(), specialization, null,
+                                "One of guards " + specialization.getGuards() + " failed"));
+                returnSpecialized = returnBuilder.getRoot();
+            }
+
+            builder.tree(createExecuteTree(builder, specialization, SpecializationGroup.create(specialization), new CodeBlock<SpecializationData>() {
+
+                public CodeTree create(CodeTreeBuilder b, SpecializationData current) {
+                    return createExecute(b, executable, specialization);
+                }
+            }, returnSpecialized, false, false, false, false));
+
+            return builder.getRoot();
+        }
+
+        private CodeTree createExecute(CodeTreeBuilder parent, ExecutableTypeData executable, SpecializationData specialization) {
+            NodeData node = specialization.getNode();
+            CodeTreeBuilder builder = new CodeTreeBuilder(parent);
+            if (!specialization.getExceptions().isEmpty() || !specialization.getAssumptions().isEmpty()) {
+                builder.startTryBlock();
+            }
+
+            for (String assumption : specialization.getAssumptions()) {
+                builder.startStatement();
+                builder.string("this.").string(assumption).string(".check()");
+                builder.end();
+            }
+
+            CodeTreeBuilder returnBuilder = new CodeTreeBuilder(parent);
+            if (specialization.isPolymorphic()) {
+                returnBuilder.startCall("next0", EXECUTE_CHAINED);
+                addInternalValueParameterNames(returnBuilder, specialization, specialization, null, true, null);
+                returnBuilder.end();
+            } else if (specialization.isUninitialized()) {
+                returnBuilder.startCall(EXECUTE_UNINITIALIZED);
+                addInternalValueParameterNames(returnBuilder, specialization, specialization, null, true, null);
+                returnBuilder.end();
+            } else if (specialization.getMethod() == null && !node.needsRewrites(context)) {
+                emitEncounteredSynthetic(builder, specialization);
+            } else {
+                returnBuilder.tree(createTemplateMethodCall(returnBuilder, null, specialization, specialization, null));
+            }
+
+            if (!returnBuilder.isEmpty()) {
+                TypeData targetType = node.getTypeSystem().findTypeData(builder.findMethod().getReturnType());
+                TypeData sourceType = specialization.getReturnType().getTypeSystemType();
+
+                builder.startReturn();
+                if (targetType == null || sourceType == null) {
+                    builder.tree(returnBuilder.getRoot());
+                } else if (sourceType.needsCastTo(targetType)) {
+                    String castMethodName = TypeSystemCodeGenerator.expectTypeMethodName(targetType);
+                    if (!executable.hasUnexpectedValue(context)) {
+                        castMethodName = TypeSystemCodeGenerator.asTypeMethodName(targetType);
+                    }
+                    builder.tree(createCallTypeSystemMethod(parent, node, castMethodName, returnBuilder.getRoot()));
+                } else {
+                    builder.tree(returnBuilder.getRoot());
+                }
+                builder.end();
+            }
+
+            if (!specialization.getExceptions().isEmpty()) {
+                for (SpecializationThrowsData exception : specialization.getExceptions()) {
+                    builder.end().startCatchBlock(exception.getJavaClass(), "ex");
+                    builder.tree(createDeoptimize(builder));
+                    builder.tree(createCallRewriteMonomorphic(parent, executable.hasUnexpectedValue(context), executable.getType(), specialization, null,
+                                    "Thrown " + ElementUtils.getSimpleName(exception.getJavaClass())));
+                }
+                builder.end();
+            }
+            if (!specialization.getAssumptions().isEmpty()) {
+                builder.end().startCatchBlock(getContext().getTruffleTypes().getInvalidAssumption(), "ex");
+                builder.tree(createCallRewriteMonomorphic(parent, executable.hasUnexpectedValue(context), executable.getType(), specialization, null, "Assumption failed"));
+                builder.end();
+            }
+
+            return builder.getRoot();
+        }
+
+        protected CodeExecutableElement createCopyConstructorFactoryMethod(TypeMirror baseType, SpecializationData specialization) {
+            List<Parameter> implicitTypeParams = getImplicitTypeParameters(specialization);
+            String baseName = "current";
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(STATIC), specialization.getNode().getNodeType(), FACTORY_METHOD_NAME);
+            method.addParameter(new CodeVariableElement(specialization.getNode().getNodeType(), baseName));
+            for (Parameter implicitTypeParam : implicitTypeParams) {
+                method.addParameter(new CodeVariableElement(getContext().getType(Class.class), implicitTypeName(implicitTypeParam)));
+            }
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.startReturn();
+            builder.startNew(getElement().asType());
+            builder.startGroup().cast(baseType, CodeTreeBuilder.singleString(baseName)).end();
+            for (Parameter param : implicitTypeParams) {
+                builder.string(implicitTypeName(param));
+            }
+            builder.end().end();
+            return method;
+        }
+
+        protected CodeExecutableElement createConstructorFactoryMethod(SpecializationData specialization, ExecutableElement constructor) {
+            List<? extends VariableElement> parameters = constructor.getParameters();
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(STATIC), specialization.getNode().getNodeType(), FACTORY_METHOD_NAME,
+                            parameters.toArray(new CodeVariableElement[parameters.size()]));
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.startReturn();
+            builder.startNew(getElement().asType());
+            for (VariableElement param : parameters) {
+                builder.string(((CodeVariableElement) param).getName());
+            }
+            builder.end().end();
+            return method;
+        }
+    }
+
+    private interface CodeBlock<T> {
+
+        CodeTree create(CodeTreeBuilder parent, T value);
+
+    }
+}