--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/Utils.java	Mon Jul 01 20:58:32 2013 +0200
@@ -0,0 +1,930 @@
+/*
+ * Copyright (c) 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;
+
+import java.io.*;
+import java.lang.annotation.*;
+import java.util.*;
+
+import javax.annotation.processing.*;
+import javax.lang.model.element.*;
+import javax.lang.model.type.*;
+import javax.lang.model.util.*;
+
+import com.oracle.truffle.dsl.processor.ast.*;
+import com.oracle.truffle.dsl.processor.ast.CodeTypeMirror.*;
+import com.oracle.truffle.dsl.processor.compiler.*;
+
+/**
+ * THIS IS NOT PUBLIC API.
+ */
+public class Utils {
+
+    public static ExecutableElement findExecutableElement(DeclaredType type, String name) {
+        List<? extends ExecutableElement> elements = ElementFilter.methodsIn(type.asElement().getEnclosedElements());
+        for (ExecutableElement executableElement : elements) {
+            if (executableElement.getSimpleName().toString().equals(name)) {
+                return executableElement;
+            }
+        }
+        return null;
+    }
+
+    public static VariableElement findVariableElement(DeclaredType type, String name) {
+        List<? extends VariableElement> elements = ElementFilter.fieldsIn(type.asElement().getEnclosedElements());
+        for (VariableElement variableElement : elements) {
+            if (variableElement.getSimpleName().toString().equals(name)) {
+                return variableElement;
+            }
+        }
+        return null;
+    }
+
+    public static String getMethodBody(ProcessingEnvironment env, ExecutableElement method) {
+        if (method instanceof CodeExecutableElement) {
+            return ((CodeExecutableElement) method).getBody();
+        } else {
+            return CompilerFactory.getCompiler(method).getMethodBody(env, method);
+        }
+    }
+
+    public static TypeMirror boxType(ProcessorContext context, TypeMirror primitiveType) {
+        TypeMirror boxedType = primitiveType;
+        if (boxedType.getKind().isPrimitive()) {
+            boxedType = context.getEnvironment().getTypeUtils().boxedClass((PrimitiveType) boxedType).asType();
+        }
+        return boxedType;
+    }
+
+    public static List<TypeMirror> asTypeMirrors(List<? extends Element> elements) {
+        List<TypeMirror> types = new ArrayList<>(elements.size());
+        for (Element element : elements) {
+            types.add(element.asType());
+        }
+        return types;
+    }
+
+    public static DeclaredType getDeclaredType(TypeElement typeElem, TypeMirror... typeArgs) {
+        return new DeclaredCodeTypeMirror(typeElem, Arrays.asList(typeArgs));
+    }
+
+    public static List<AnnotationMirror> collectAnnotations(ProcessorContext context, AnnotationMirror markerAnnotation, String elementName, Element element,
+                    Class<? extends Annotation> annotationClass) {
+        List<AnnotationMirror> result = new ArrayList<>();
+        if (markerAnnotation != null) {
+            result.addAll(Utils.getAnnotationValueList(AnnotationMirror.class, markerAnnotation, elementName));
+        }
+        AnnotationMirror explicit = Utils.findAnnotationMirror(context.getEnvironment(), element, annotationClass);
+        if (explicit != null) {
+            result.add(explicit);
+        }
+        return result;
+    }
+
+    public static TypeMirror getCommonSuperType(ProcessorContext context, TypeMirror[] types) {
+        if (types.length == 0) {
+            return context.getType(Object.class);
+        }
+        TypeMirror prev = types[0];
+        for (int i = 1; i < types.length; i++) {
+            prev = getCommonSuperType(context, prev, types[i]);
+        }
+        return prev;
+    }
+
+    public static TypeMirror getCommonSuperType(ProcessorContext context, TypeMirror type1, TypeMirror type2) {
+        if (typeEquals(type1, type2)) {
+            return type1;
+        }
+        TypeElement element1 = fromTypeMirror(type1);
+        TypeElement element2 = fromTypeMirror(type2);
+        if (element1 == null || element2 == null) {
+            return context.getType(Object.class);
+        }
+
+        List<TypeElement> element1Types = getDirectSuperTypes(element1);
+        element1Types.add(0, element1);
+        List<TypeElement> element2Types = getDirectSuperTypes(element2);
+        element2Types.add(0, element2);
+
+        for (TypeElement superType1 : element1Types) {
+            for (TypeElement superType2 : element2Types) {
+                if (typeEquals(superType1.asType(), superType2.asType())) {
+                    return superType2.asType();
+                }
+            }
+        }
+        return context.getType(Object.class);
+    }
+
+    public static String getReadableSignature(ExecutableElement method) {
+        // TODO toString does not guarantee a good signature
+        return method.toString();
+    }
+
+    public static boolean hasError(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+            case BYTE:
+            case CHAR:
+            case DOUBLE:
+            case FLOAT:
+            case INT:
+            case SHORT:
+            case LONG:
+            case DECLARED:
+            case VOID:
+            case TYPEVAR:
+                return false;
+            case ARRAY:
+                return hasError(((ArrayType) mirror).getComponentType());
+            case ERROR:
+                return true;
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind() + " mirror: " + mirror);
+        }
+    }
+
+    public static boolean isAssignable(ProcessorContext context, TypeMirror from, TypeMirror to) {
+        if (!(from instanceof CodeTypeMirror) && !(to instanceof CodeTypeMirror)) {
+            return context.getEnvironment().getTypeUtils().isAssignable(context.reloadType(from), context.reloadType(to));
+        } else {
+            return isAssignableImpl(context, from, to);
+        }
+    }
+
+    private static boolean isAssignableImpl(ProcessorContext context, TypeMirror from, TypeMirror to) {
+        // JLS 5.1.1 identity conversion
+        if (Utils.typeEquals(from, to)) {
+            return true;
+        }
+
+        // JLS 5.1.2 widening primitives
+        if (Utils.isPrimitive(from) && Utils.isPrimitive(to)) {
+            TypeKind fromKind = from.getKind();
+            TypeKind toKind = to.getKind();
+            switch (fromKind) {
+                case BYTE:
+                    switch (toKind) {
+                        case SHORT:
+                        case INT:
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case SHORT:
+                    switch (toKind) {
+                        case INT:
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case CHAR:
+                    switch (toKind) {
+                        case INT:
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case INT:
+                    switch (toKind) {
+                        case LONG:
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case LONG:
+                    switch (toKind) {
+                        case FLOAT:
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+                case FLOAT:
+                    switch (toKind) {
+                        case DOUBLE:
+                            return true;
+                    }
+                    break;
+
+            }
+            return false;
+        } else if (Utils.isPrimitive(from) || Utils.isPrimitive(to)) {
+            return false;
+        }
+
+        if (from instanceof ArrayType && to instanceof ArrayType) {
+            return isAssignable(context, ((ArrayType) from).getComponentType(), ((ArrayType) to).getComponentType());
+        }
+
+        TypeElement fromType = Utils.fromTypeMirror(from);
+        TypeElement toType = Utils.fromTypeMirror(to);
+        if (fromType == null || toType == null) {
+            return false;
+        }
+        // JLS 5.1.6 narrowing reference conversion
+
+        List<TypeElement> superTypes = Utils.getSuperTypes(fromType);
+        for (TypeElement superType : superTypes) {
+            if (Utils.typeEquals(superType.asType(), to)) {
+                return true;
+            }
+        }
+
+        // TODO more spec
+        return false;
+    }
+
+    public static Set<Modifier> modifiers(Modifier... modifier) {
+        return new LinkedHashSet<>(Arrays.asList(modifier));
+    }
+
+    public static String getTypeId(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+                return "Boolean";
+            case BYTE:
+                return "Byte";
+            case CHAR:
+                return "Char";
+            case DOUBLE:
+                return "Double";
+            case FLOAT:
+                return "Float";
+            case SHORT:
+                return "Short";
+            case INT:
+                return "Int";
+            case LONG:
+                return "Long";
+            case DECLARED:
+                return ((DeclaredType) mirror).asElement().getSimpleName().toString();
+            case ARRAY:
+                return getTypeId(((ArrayType) mirror).getComponentType()) + "Array";
+            case VOID:
+                return "Void";
+            case WILDCARD:
+                StringBuilder b = new StringBuilder();
+                WildcardType type = (WildcardType) mirror;
+                if (type.getExtendsBound() != null) {
+                    b.append("Extends").append(getTypeId(type.getExtendsBound()));
+                } else if (type.getSuperBound() != null) {
+                    b.append("Super").append(getTypeId(type.getExtendsBound()));
+                }
+                return b.toString();
+            case TYPEVAR:
+                return "Any";
+            case ERROR:
+                throw new CompileErrorException("Type error " + mirror);
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind() + " mirror: " + mirror);
+        }
+    }
+
+    public static String getSimpleName(TypeElement element) {
+        return getSimpleName(element.asType());
+    }
+
+    public static String getSimpleName(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+                return "boolean";
+            case BYTE:
+                return "byte";
+            case CHAR:
+                return "char";
+            case DOUBLE:
+                return "double";
+            case FLOAT:
+                return "float";
+            case SHORT:
+                return "short";
+            case INT:
+                return "int";
+            case LONG:
+                return "long";
+            case DECLARED:
+                return getDeclaredName((DeclaredType) mirror);
+            case ARRAY:
+                return getSimpleName(((ArrayType) mirror).getComponentType()) + "[]";
+            case VOID:
+                return "void";
+            case WILDCARD:
+                return getWildcardName((WildcardType) mirror);
+            case TYPEVAR:
+                return "?";
+            case ERROR:
+                throw new CompileErrorException("Type error " + mirror);
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind() + " mirror: " + mirror);
+        }
+    }
+
+    private static String getWildcardName(WildcardType type) {
+        StringBuilder b = new StringBuilder();
+        if (type.getExtendsBound() != null) {
+            b.append("? extends ").append(getSimpleName(type.getExtendsBound()));
+        } else if (type.getSuperBound() != null) {
+            b.append("? super ").append(getSimpleName(type.getExtendsBound()));
+        }
+        return b.toString();
+    }
+
+    private static String getDeclaredName(DeclaredType element) {
+        String simpleName = element.asElement().getSimpleName().toString();
+
+        if (element.getTypeArguments().size() == 0) {
+            return simpleName;
+        }
+
+        StringBuilder b = new StringBuilder(simpleName);
+        b.append("<");
+        if (element.getTypeArguments().size() > 0) {
+            for (int i = 0; i < element.getTypeArguments().size(); i++) {
+                b.append(getSimpleName(element.getTypeArguments().get(i)));
+                if (i < element.getTypeArguments().size() - 1) {
+                    b.append(", ");
+                }
+            }
+        }
+        b.append(">");
+        return b.toString();
+    }
+
+    public static String getQualifiedName(TypeElement element) {
+        return element.getQualifiedName().toString();
+    }
+
+    public static String getQualifiedName(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+                return "boolean";
+            case BYTE:
+                return "byte";
+            case CHAR:
+                return "char";
+            case DOUBLE:
+                return "double";
+            case SHORT:
+                return "short";
+            case FLOAT:
+                return "float";
+            case INT:
+                return "int";
+            case LONG:
+                return "long";
+            case DECLARED:
+                return getQualifiedName(fromTypeMirror(mirror));
+            case ARRAY:
+                return getQualifiedName(((ArrayType) mirror).getComponentType());
+            case VOID:
+                return "void";
+            case TYPEVAR:
+                return getSimpleName(mirror);
+            case ERROR:
+                throw new CompileErrorException("Type error " + mirror);
+            case NONE:
+                return "$none";
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror + " mirror: " + mirror);
+        }
+    }
+
+    public static boolean isVoid(TypeMirror mirror) {
+        return mirror.getKind() == TypeKind.VOID;
+    }
+
+    public static boolean isPrimitive(TypeMirror mirror) {
+        return mirror.getKind().isPrimitive();
+    }
+
+    public static boolean isPrimitiveOrVoid(TypeMirror mirror) {
+        return isPrimitive(mirror) || isVoid(mirror);
+    }
+
+    public static List<String> getQualifiedSuperTypeNames(TypeElement element) {
+        List<TypeElement> types = getSuperTypes(element);
+        List<String> qualifiedNames = new ArrayList<>();
+        for (TypeElement type : types) {
+            qualifiedNames.add(getQualifiedName(type));
+        }
+        return qualifiedNames;
+    }
+
+    public static List<TypeElement> getDeclaredTypes(TypeElement element) {
+        return ElementFilter.typesIn(element.getEnclosedElements());
+    }
+
+    public static VariableElement findDeclaredField(TypeMirror type, String singletonName) {
+        List<VariableElement> elements = ElementFilter.fieldsIn(fromTypeMirror(type).getEnclosedElements());
+        for (VariableElement var : elements) {
+            if (var.getSimpleName().toString().equals(singletonName)) {
+                return var;
+            }
+        }
+        return null;
+    }
+
+    public static TypeElement findRootEnclosingType(Element element) {
+        List<Element> elements = getElementHierarchy(element);
+
+        for (int i = elements.size() - 1; i >= 0; i--) {
+            if (elements.get(i).getKind().isClass()) {
+                return (TypeElement) elements.get(i);
+            }
+        }
+
+        return null;
+    }
+
+    public static List<Element> getElementHierarchy(Element e) {
+        List<Element> elements = new ArrayList<>();
+        elements.add(e);
+
+        Element enclosing = e.getEnclosingElement();
+        while (enclosing != null && enclosing.getKind() != ElementKind.PACKAGE) {
+            elements.add(enclosing);
+            enclosing = enclosing.getEnclosingElement();
+        }
+        if (enclosing != null) {
+            elements.add(enclosing);
+        }
+        return elements;
+    }
+
+    public static TypeElement findNearestEnclosingType(Element element) {
+        List<Element> elements = getElementHierarchy(element);
+        for (Element e : elements) {
+            if (e.getKind().isClass()) {
+                return (TypeElement) e;
+            }
+        }
+        return null;
+    }
+
+    public static List<TypeElement> getDirectSuperTypes(TypeElement element) {
+        List<TypeElement> types = new ArrayList<>();
+        if (element.getSuperclass() != null) {
+            TypeElement superElement = fromTypeMirror(element.getSuperclass());
+            if (superElement != null) {
+                types.add(superElement);
+                types.addAll(getDirectSuperTypes(superElement));
+            }
+        }
+
+        return types;
+    }
+
+    public static List<TypeElement> getSuperTypes(TypeElement element) {
+        List<TypeElement> types = new ArrayList<>();
+        List<TypeElement> superTypes = null;
+        List<TypeElement> superInterfaces = null;
+        if (element.getSuperclass() != null) {
+            TypeElement superElement = fromTypeMirror(element.getSuperclass());
+            if (superElement != null) {
+                types.add(superElement);
+                superTypes = getSuperTypes(superElement);
+            }
+        }
+        for (TypeMirror interfaceMirror : element.getInterfaces()) {
+            TypeElement interfaceElement = fromTypeMirror(interfaceMirror);
+            if (interfaceElement != null) {
+                types.add(interfaceElement);
+                superInterfaces = getSuperTypes(interfaceElement);
+            }
+        }
+
+        if (superTypes != null) {
+            types.addAll(superTypes);
+        }
+
+        if (superInterfaces != null) {
+            types.addAll(superInterfaces);
+        }
+
+        return types;
+    }
+
+    public static String getPackageName(TypeElement element) {
+        return findPackageElement(element).getQualifiedName().toString();
+    }
+
+    public static String getPackageName(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case BOOLEAN:
+            case BYTE:
+            case CHAR:
+            case DOUBLE:
+            case FLOAT:
+            case SHORT:
+            case INT:
+            case LONG:
+            case VOID:
+            case TYPEVAR:
+                return null;
+            case DECLARED:
+                PackageElement pack = findPackageElement(fromTypeMirror(mirror));
+                if (pack == null) {
+                    throw new IllegalArgumentException("No package element found for declared type " + getSimpleName(mirror));
+                }
+                return pack.getQualifiedName().toString();
+            case ARRAY:
+                return getSimpleName(((ArrayType) mirror).getComponentType());
+            default:
+                throw new RuntimeException("Unknown type specified " + mirror.getKind());
+        }
+    }
+
+    public static String createConstantName(String simpleName) {
+        // TODO use camel case to produce underscores.
+        return simpleName.toString().toUpperCase();
+    }
+
+    public static TypeElement fromTypeMirror(TypeMirror mirror) {
+        switch (mirror.getKind()) {
+            case DECLARED:
+                return (TypeElement) ((DeclaredType) mirror).asElement();
+            case ARRAY:
+                return fromTypeMirror(((ArrayType) mirror).getComponentType());
+            default:
+                return null;
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public static <T> List<T> getAnnotationValueList(Class<T> expectedListType, AnnotationMirror mirror, String name) {
+        List<? extends AnnotationValue> values = getAnnotationValue(List.class, mirror, name);
+        List<T> result = new ArrayList<>();
+
+        if (values != null) {
+            for (AnnotationValue value : values) {
+                T annotationValue = resolveAnnotationValue(expectedListType, value);
+                if (annotationValue != null) {
+                    result.add(annotationValue);
+                }
+            }
+        }
+        return result;
+    }
+
+    public static <T> T getAnnotationValue(Class<T> expectedType, AnnotationMirror mirror, String name) {
+        return resolveAnnotationValue(expectedType, getAnnotationValue(mirror, name));
+    }
+
+    @SuppressWarnings({"unchecked"})
+    private static <T> T resolveAnnotationValue(Class<T> expectedType, AnnotationValue value) {
+        if (value == null) {
+            return null;
+        }
+
+        Object unboxedValue = value.accept(new AnnotationValueVisitorImpl(), null);
+        if (unboxedValue != null) {
+            if (expectedType == TypeMirror.class && unboxedValue instanceof String) {
+                return null;
+            }
+            if (!expectedType.isAssignableFrom(unboxedValue.getClass())) {
+                throw new ClassCastException(unboxedValue.getClass().getName() + " not assignable from " + expectedType.getName());
+            }
+        }
+        return (T) unboxedValue;
+    }
+
+    public static AnnotationValue getAnnotationValue(AnnotationMirror mirror, String name) {
+        ExecutableElement valueMethod = null;
+        for (ExecutableElement method : ElementFilter.methodsIn(mirror.getAnnotationType().asElement().getEnclosedElements())) {
+            if (method.getSimpleName().toString().equals(name)) {
+                valueMethod = method;
+                break;
+            }
+        }
+
+        if (valueMethod == null) {
+            return null;
+        }
+
+        AnnotationValue value = mirror.getElementValues().get(valueMethod);
+        if (value == null) {
+            value = valueMethod.getDefaultValue();
+        }
+
+        return value;
+    }
+
+    private static class AnnotationValueVisitorImpl extends AbstractAnnotationValueVisitor7<Object, Void> {
+
+        @Override
+        public Object visitBoolean(boolean b, Void p) {
+            return Boolean.valueOf(b);
+        }
+
+        @Override
+        public Object visitByte(byte b, Void p) {
+            return Byte.valueOf(b);
+        }
+
+        @Override
+        public Object visitChar(char c, Void p) {
+            return c;
+        }
+
+        @Override
+        public Object visitDouble(double d, Void p) {
+            return d;
+        }
+
+        @Override
+        public Object visitFloat(float f, Void p) {
+            return f;
+        }
+
+        @Override
+        public Object visitInt(int i, Void p) {
+            return i;
+        }
+
+        @Override
+        public Object visitLong(long i, Void p) {
+            return i;
+        }
+
+        @Override
+        public Object visitShort(short s, Void p) {
+            return s;
+        }
+
+        @Override
+        public Object visitString(String s, Void p) {
+            return s;
+        }
+
+        @Override
+        public Object visitType(TypeMirror t, Void p) {
+            return t;
+        }
+
+        @Override
+        public Object visitEnumConstant(VariableElement c, Void p) {
+            return c;
+        }
+
+        @Override
+        public Object visitAnnotation(AnnotationMirror a, Void p) {
+            return a;
+        }
+
+        @Override
+        public Object visitArray(List<? extends AnnotationValue> vals, Void p) {
+            return vals;
+        }
+
+    }
+
+    public static boolean getAnnotationValueBoolean(AnnotationMirror mirror, String name) {
+        return (Boolean) getAnnotationValue(mirror, name).getValue();
+    }
+
+    public static String printException(Throwable e) {
+        StringWriter string = new StringWriter();
+        PrintWriter writer = new PrintWriter(string);
+        e.printStackTrace(writer);
+        writer.flush();
+        return e.getMessage() + "\r\n" + string.toString();
+    }
+
+    public static AnnotationMirror findAnnotationMirror(ProcessingEnvironment processingEnv, Element element, Class<?> annotationClass) {
+        return findAnnotationMirror(processingEnv, element.getAnnotationMirrors(), annotationClass);
+    }
+
+    public static AnnotationMirror findAnnotationMirror(ProcessingEnvironment processingEnv, List<? extends AnnotationMirror> mirrors, Class<?> annotationClass) {
+        TypeElement expectedAnnotationType = processingEnv.getElementUtils().getTypeElement(annotationClass.getCanonicalName());
+        for (AnnotationMirror mirror : mirrors) {
+            DeclaredType annotationType = mirror.getAnnotationType();
+            TypeElement actualAnnotationType = (TypeElement) annotationType.asElement();
+            if (actualAnnotationType.equals(expectedAnnotationType)) {
+                return mirror;
+            }
+        }
+        return null;
+    }
+
+    private static PackageElement findPackageElement(Element type) {
+        List<Element> hierarchy = getElementHierarchy(type);
+        for (Element element : hierarchy) {
+            if (element.getKind() == ElementKind.PACKAGE) {
+                return (PackageElement) element;
+            }
+        }
+        return null;
+    }
+
+    public static String firstLetterUpperCase(String name) {
+        if (name == null || name.isEmpty()) {
+            return name;
+        }
+        return Character.toUpperCase(name.charAt(0)) + name.substring(1, name.length());
+    }
+
+    public static String firstLetterLowerCase(String name) {
+        if (name == null || name.isEmpty()) {
+            return name;
+        }
+        return Character.toLowerCase(name.charAt(0)) + name.substring(1, name.length());
+    }
+
+    private static ExecutableElement getDeclaredMethod(TypeElement element, String name, TypeMirror[] params) {
+        List<ExecutableElement> methods = ElementFilter.methodsIn(element.getEnclosedElements());
+        method: for (ExecutableElement method : methods) {
+            if (!method.getSimpleName().toString().equals(name)) {
+                continue;
+            }
+            if (method.getParameters().size() != params.length) {
+                continue;
+            }
+            for (int i = 0; i < params.length; i++) {
+                TypeMirror param1 = params[i];
+                TypeMirror param2 = method.getParameters().get(i).asType();
+                if (param1.getKind() != TypeKind.TYPEVAR && param2.getKind() != TypeKind.TYPEVAR) {
+                    if (!getQualifiedName(param1).equals(getQualifiedName(param2))) {
+                        continue method;
+                    }
+                }
+            }
+            return method;
+        }
+        return null;
+    }
+
+    private static boolean isDeclaredMethod(TypeElement element, String name, TypeMirror[] params) {
+        return getDeclaredMethod(element, name, params) != null;
+    }
+
+    public static boolean isDeclaredMethodInSuperType(TypeElement element, String name, TypeMirror[] params) {
+        List<TypeElement> superElements = getSuperTypes(element);
+
+        for (TypeElement typeElement : superElements) {
+            if (isDeclaredMethod(typeElement, name, params)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static ExecutableElement getDeclaredMethodInSuperType(TypeElement element, String name, TypeMirror[] params) {
+        List<TypeElement> superElements = getSuperTypes(element);
+
+        for (TypeElement typeElement : superElements) {
+            ExecutableElement declared = getDeclaredMethod(typeElement, name, params);
+            if (declared != null) {
+                return declared;
+            }
+        }
+        return null;
+    }
+
+    public static ExecutableElement getDeclaredMethodRecursive(TypeElement element, String name, TypeMirror[] params) {
+        ExecutableElement declared = getDeclaredMethod(element, name, params);
+        if (declared != null) {
+            return declared;
+        }
+        return getDeclaredMethodInSuperType(element, name, params);
+    }
+
+    public static boolean typeEquals(TypeMirror type1, TypeMirror type2) {
+        if (type1 == null && type2 == null) {
+            return true;
+        } else if (type1 == null || type2 == null) {
+            return false;
+        }
+        String qualified1 = getQualifiedName(type1);
+        String qualified2 = getQualifiedName(type2);
+
+        if (type1.getKind() == TypeKind.ARRAY || type2.getKind() == TypeKind.ARRAY) {
+            if (type1.getKind() == TypeKind.ARRAY && type2.getKind() == TypeKind.ARRAY) {
+                return typeEquals(((ArrayType) type1).getComponentType(), ((ArrayType) type2).getComponentType());
+            } else {
+                return false;
+            }
+        }
+        return qualified1.equals(qualified2);
+    }
+
+    public static int compareByTypeHierarchy(TypeMirror t1, TypeMirror t2) {
+        if (typeEquals(t1, t2)) {
+            return 0;
+        }
+        Set<String> t1SuperSet = new HashSet<>(getQualifiedSuperTypeNames(fromTypeMirror(t1)));
+        if (t1SuperSet.contains(getQualifiedName(t2))) {
+            return -1;
+        }
+
+        Set<String> t2SuperSet = new HashSet<>(getQualifiedSuperTypeNames(fromTypeMirror(t2)));
+        if (t2SuperSet.contains(getQualifiedName(t1))) {
+            return 1;
+        }
+        return 0;
+    }
+
+    public static boolean canThrowType(List<? extends TypeMirror> thrownTypes, TypeMirror exceptionType) {
+        if (Utils.containsType(thrownTypes, exceptionType)) {
+            return true;
+        }
+
+        if (isRuntimeException(exceptionType)) {
+            return true;
+        }
+
+        // search for any super types
+        TypeElement exceptionTypeElement = fromTypeMirror(exceptionType);
+        List<TypeElement> superTypes = getSuperTypes(exceptionTypeElement);
+        for (TypeElement typeElement : superTypes) {
+            if (Utils.containsType(thrownTypes, typeElement.asType())) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public static Modifier getVisibility(Set<Modifier> modifier) {
+        for (Modifier mod : modifier) {
+            if (mod == Modifier.PUBLIC || mod == Modifier.PRIVATE || mod == Modifier.PROTECTED) {
+                return mod;
+            }
+        }
+        return null;
+    }
+
+    private static boolean isRuntimeException(TypeMirror type) {
+        Set<String> typeSuperSet = new HashSet<>(getQualifiedSuperTypeNames(fromTypeMirror(type)));
+        String typeName = getQualifiedName(type);
+        if (!typeSuperSet.contains(Throwable.class.getCanonicalName()) && !typeName.equals(Throwable.class.getCanonicalName())) {
+            throw new IllegalArgumentException("Given type does not extend Throwable.");
+        }
+        return typeSuperSet.contains(RuntimeException.class.getCanonicalName()) || typeName.equals(RuntimeException.class.getCanonicalName());
+    }
+
+    private static boolean containsType(Collection<? extends TypeMirror> collection, TypeMirror type) {
+        for (TypeMirror otherTypeMirror : collection) {
+            if (typeEquals(otherTypeMirror, type)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static boolean isTopLevelClass(TypeMirror importType) {
+        TypeElement type = fromTypeMirror(importType);
+        if (type != null && type.getEnclosingElement() != null) {
+            return !type.getEnclosingElement().getKind().isClass();
+        }
+        return true;
+    }
+
+    public static boolean isObject(TypeMirror actualType) {
+        return getQualifiedName(actualType).equals("java.lang.Object");
+    }
+
+    public static boolean isFieldAccessible(Element element, VariableElement variable) {
+        TypeElement type = Utils.findNearestEnclosingType(element);
+        TypeElement varType = Utils.findNearestEnclosingType(variable);
+
+        while (type != null) {
+            if (typeEquals(type.asType(), varType.asType())) {
+                return true;
+            }
+            if (type.getSuperclass() != null) {
+                type = Utils.fromTypeMirror(type.getSuperclass());
+            } else {
+                type = null;
+            }
+        }
+        return false;
+    }
+}