--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/generator/GeneratorUtils.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 2014, 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.*;
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.api.dsl.internal.DSLOptions.TypeBoxingOptimization;
+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.model.*;
+
+public class GeneratorUtils {
+
+    public static CodeTree createTransferToInterpreterAndInvalidate() {
+        ProcessorContext context = ProcessorContext.getInstance();
+        CodeTreeBuilder builder = CodeTreeBuilder.createBuilder();
+        builder.startStatement().startStaticCall(context.getType(CompilerDirectives.class), "transferToInterpreterAndInvalidate").end().end();
+        return builder.build();
+    }
+
+    public static CodeExecutableElement createConstructorUsingFields(Set<Modifier> modifiers, CodeTypeElement clazz) {
+        TypeElement superClass = fromTypeMirror(clazz.getSuperclass());
+        ExecutableElement constructor = findConstructor(superClass);
+        return createConstructorUsingFields(modifiers, clazz, constructor);
+    }
+
+    public static CodeExecutableElement createConstructorUsingFields(Set<Modifier> modifiers, CodeTypeElement clazz, ExecutableElement constructor) {
+        CodeExecutableElement method = new CodeExecutableElement(modifiers, null, clazz.getSimpleName().toString());
+        CodeTreeBuilder builder = method.createBuilder();
+        if (constructor != null && constructor.getParameters().size() > 0) {
+            builder.startStatement();
+            builder.startSuperCall();
+            for (VariableElement parameter : constructor.getParameters()) {
+                method.addParameter(new CodeVariableElement(parameter.asType(), parameter.getSimpleName().toString()));
+                builder.string(parameter.getSimpleName().toString());
+            }
+            builder.end(); // super
+            builder.end(); // statement
+        }
+
+        for (VariableElement field : clazz.getFields()) {
+            if (field.getModifiers().contains(STATIC)) {
+                continue;
+            }
+            String fieldName = field.getSimpleName().toString();
+            method.addParameter(new CodeVariableElement(field.asType(), fieldName));
+            builder.startStatement();
+            builder.string("this.");
+            builder.string(fieldName);
+            builder.string(" = ");
+            builder.string(fieldName);
+            builder.end(); // statement
+        }
+
+        return method;
+    }
+
+    public static boolean isTypeBoxingOptimized(TypeBoxingOptimization boxing, TypeMirror type) {
+        switch (boxing) {
+            case NONE:
+                return false;
+            case ALWAYS:
+                return !ElementUtils.isObject(type) && !ElementUtils.isVoid(type);
+            case PRIMITIVE:
+                return ElementUtils.isPrimitive(type);
+            default:
+                throw new AssertionError();
+        }
+    }
+
+    private static ExecutableElement findConstructor(TypeElement clazz) {
+        List<ExecutableElement> constructors = ElementFilter.constructorsIn(clazz.getEnclosedElements());
+        if (constructors.isEmpty()) {
+            return null;
+        } else {
+            return constructors.get(0);
+        }
+    }
+
+    public static CodeExecutableElement createSuperConstructor(ProcessorContext context, TypeElement type, ExecutableElement element) {
+        if (element.getModifiers().contains(Modifier.PRIVATE)) {
+            return null;
+        }
+        CodeExecutableElement executable = CodeExecutableElement.clone(context.getEnvironment(), element);
+        executable.setReturnType(null);
+        executable.setSimpleName(CodeNames.of(type.getSimpleName().toString()));
+        CodeTreeBuilder b = executable.createBuilder();
+        b.startStatement();
+        b.startSuperCall();
+        for (VariableElement v : element.getParameters()) {
+            b.string(v.getSimpleName().toString());
+        }
+        b.end();
+        b.end();
+
+        return executable;
+    }
+
+    public static CodeTypeElement createClass(Template sourceModel, TemplateMethod sourceMethod, Set<Modifier> modifiers, String simpleName, TypeMirror superType) {
+        TypeElement templateType = sourceModel.getTemplateType();
+
+        ProcessorContext context = ProcessorContext.getInstance();
+
+        PackageElement pack = context.getEnvironment().getElementUtils().getPackageOf(templateType);
+        CodeTypeElement clazz = new CodeTypeElement(modifiers, ElementKind.CLASS, pack, simpleName);
+        TypeMirror resolvedSuperType = superType;
+        if (resolvedSuperType == null) {
+            resolvedSuperType = context.getType(Object.class);
+        }
+        clazz.setSuperClass(resolvedSuperType);
+
+        CodeAnnotationMirror generatedByAnnotation = new CodeAnnotationMirror((DeclaredType) context.getType(GeneratedBy.class));
+        generatedByAnnotation.setElementValue(generatedByAnnotation.findExecutableElement("value"), new CodeAnnotationValue(templateType.asType()));
+        if (sourceMethod != null && sourceMethod.getMethod() != null) {
+            generatedByAnnotation.setElementValue(generatedByAnnotation.findExecutableElement("methodName"), new CodeAnnotationValue(sourceMethod.createReferenceName()));
+        }
+
+        clazz.addAnnotationMirror(generatedByAnnotation);
+        return clazz;
+    }
+
+    public 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;
+    }
+
+    public 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;
+    }
+
+}