--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.codegen.processor/src/com/oracle/truffle/codegen/processor/typesystem/TypeSystemCodeGenerator.java	Fri Dec 21 10:44:31 2012 -0800
@@ -0,0 +1,240 @@
+/*
+ * 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.codegen.processor.typesystem;
+
+import static com.oracle.truffle.codegen.processor.Utils.*;
+import static javax.lang.model.element.Modifier.*;
+
+import java.util.*;
+
+import javax.lang.model.element.*;
+import javax.lang.model.type.*;
+
+import com.oracle.truffle.codegen.processor.*;
+import com.oracle.truffle.codegen.processor.ast.*;
+import com.oracle.truffle.codegen.processor.template.*;
+
+public class TypeSystemCodeGenerator extends CompilationUnitFactory<TypeSystemData> {
+
+    public TypeSystemCodeGenerator(ProcessorContext context) {
+        super(context);
+    }
+
+    public static String isTypeMethodName(TypeData type) {
+        return "is" + Utils.getSimpleName(type.getBoxedType());
+    }
+
+    public static String asTypeMethodName(TypeData type) {
+        return "as" + Utils.getSimpleName(type.getBoxedType());
+    }
+
+    public static String expectTypeMethodName(TypeData type) {
+        return "expect" + Utils.getSimpleName(type.getBoxedType());
+    }
+
+    /**
+     * Finds the generated singleton field for a TypeSytemData instance. TypeSystemCodeGenerator must be applied to the
+     * TypeSystemData model before use.
+     */
+    public static VariableElement findSingleton(ProcessorContext context, TypeSystemData typeSystem) {
+        TypeMirror type = context.findGeneratedClassBySimpleName(TypeClassFactory.typeName(typeSystem), typeSystem);
+        return Utils.findDeclaredField(type, TypeClassFactory.singletonName(typeSystem.getTemplateType().asType()));
+    }
+
+    @Override
+    protected void createChildren(TypeSystemData m) {
+        add(new TypeClassFactory(context), m);
+    }
+
+    protected static class TypeClassFactory extends ClassElementFactory<TypeSystemData> {
+
+        private static final String LOCAL_VALUE = "value";
+
+        public TypeClassFactory(ProcessorContext context) {
+            super(context);
+        }
+
+        @Override
+        public CodeTypeElement create(TypeSystemData typeSystem) {
+            String name = typeName(typeSystem);
+            CodeTypeElement clazz = createClass(typeSystem, modifiers(PUBLIC), name, typeSystem.getTemplateType().asType(), false);
+
+            clazz.getImplements().add(getContext().getTruffleTypes().getTypeConversion());
+
+            clazz.add(createConstructorUsingFields(modifiers(PROTECTED), clazz));
+            CodeVariableElement singleton = createSingleton(clazz);
+            clazz.add(singleton);
+
+            clazz.add(createGetTopType(typeSystem));
+            clazz.add(createConvertTo(typeSystem, singleton));
+
+            for (TypeData type : typeSystem.getTypes()) {
+                if (!type.isGeneric()) {
+                    CodeExecutableElement isType = createIsTypeMethod(type);
+                    if (isType != null) {
+                        clazz.add(isType);
+                    }
+                    CodeExecutableElement asType = createAsTypeMethod(type);
+                    if (asType != null) {
+                        clazz.add(asType);
+                    }
+
+                    for (TypeData sourceType : collectExpectSourceTypes(type)) {
+                        CodeExecutableElement expect = createExpectTypeMethod(type, sourceType);
+                        if (expect != null) {
+                            clazz.add(expect);
+                        }
+                    }
+                }
+            }
+
+            clazz.getEnclosedElements().addAll(typeSystem.getExtensionElements());
+
+            return clazz;
+        }
+
+        private static List<TypeData> collectExpectSourceTypes(TypeData type) {
+            Set<TypeData> sourceTypes = new HashSet<>();
+            sourceTypes.add(type.getTypeSystem().getGenericTypeData());
+            for (TypeCastData cast : type.getTypeCasts()) {
+                sourceTypes.add(cast.getSourceType());
+            }
+            for (TypeCheckData cast : type.getTypeChecks()) {
+                sourceTypes.add(cast.getCheckedType());
+            }
+            return new ArrayList<>(sourceTypes);
+        }
+
+
+        private CodeExecutableElement createConvertTo(TypeSystemData typeSystem, CodeVariableElement singleton) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), getContext().getType(Object.class), "convertTo");
+            method.addParameter(new CodeVariableElement(getContext().getType(Class.class), "targetType"));
+            method.addParameter(new CodeVariableElement(getContext().getType(Object.class), "value"));
+
+            CodeTreeBuilder builder = method.createBuilder();
+
+            boolean first = true;
+            for (TypeData type : typeSystem.getTypes()) {
+                if (first) {
+                    builder.startIf();
+                    first = false;
+                } else {
+                    builder.startElseIf();
+                }
+                builder.string("targetType").string(" == ").typeLiteral(type.getBoxedType());
+                builder.end(); // if
+                builder.startBlock();
+
+                builder.startReturn();
+
+                if (typeEquals(type.getBoxedType(), getContext().getType(Object.class))) {
+                    builder.string("value");
+                } else {
+                    builder.string(singleton.getName()).string(".").startCall(asTypeMethodName(type)).string("value").end();
+                }
+
+                builder.end(); // return
+
+                builder.end(); // block
+            }
+
+            builder.startThrow().startNew(getContext().getType(IllegalArgumentException.class)).end().end();
+
+            return method;
+        }
+
+        private CodeExecutableElement createGetTopType(TypeSystemData typeSystem) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), getContext().getType(Class.class), "getTopType");
+
+            CodeTreeBuilder builder = method.createBuilder();
+            builder.startReturn();
+            if (typeSystem.getTypes().length > 0) {
+                builder.typeLiteral(typeSystem.getTypes()[0].getBoxedType());
+            } else {
+                builder.null_();
+            }
+            builder.end(); // return
+
+            return method;
+        }
+
+        private static String typeName(TypeSystemData typeSystem) {
+            String name = getSimpleName(typeSystem.getTemplateType());
+            return name + "Gen";
+        }
+
+        private static String singletonName(TypeMirror type) {
+            return createConstantName(getSimpleName(type));
+        }
+
+        private CodeVariableElement createSingleton(CodeTypeElement clazz) {
+            CodeVariableElement field = new CodeVariableElement(modifiers(PUBLIC, STATIC, FINAL), clazz.asType(), singletonName(getModel().getTemplateType().asType()));
+            field.createInitBuilder().startNew(clazz.asType()).end();
+            return field;
+        }
+
+        private CodeExecutableElement createIsTypeMethod(TypeData type) {
+            if (!type.getTypeChecks().isEmpty()) {
+                return null;
+            }
+
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), getContext().getType(boolean.class),
+                            TypeSystemCodeGenerator.isTypeMethodName(type));
+            method.addParameter(new CodeVariableElement(getContext().getType(Object.class), LOCAL_VALUE));
+
+            CodeTreeBuilder body = method.createBuilder();
+            body.startReturn().instanceOf(LOCAL_VALUE, type.getBoxedType()).end();
+
+            return method;
+        }
+
+        private CodeExecutableElement createAsTypeMethod(TypeData type) {
+            if (!type.getTypeCasts().isEmpty()) {
+                return null;
+            }
+
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), type.getPrimitiveType(),
+                            TypeSystemCodeGenerator.asTypeMethodName(type));
+            method.addParameter(new CodeVariableElement(getContext().getType(Object.class), LOCAL_VALUE));
+
+            CodeTreeBuilder body = method.createBuilder();
+            body.startReturn().cast(type.getPrimitiveType(), body.create().string(LOCAL_VALUE).getTree()).end();
+
+            return method;
+        }
+
+        private CodeExecutableElement createExpectTypeMethod(TypeData expectedType, TypeData sourceType) {
+            CodeExecutableElement method = new CodeExecutableElement(modifiers(PUBLIC), expectedType.getPrimitiveType(), TypeSystemCodeGenerator.expectTypeMethodName(expectedType));
+            method.addParameter(new CodeVariableElement(sourceType.getPrimitiveType(), LOCAL_VALUE));
+            method.addThrownType(getContext().getTruffleTypes().getUnexpectedValueException());
+
+            CodeTreeBuilder body = method.createBuilder();
+            body.startIf().startCall(null, TypeSystemCodeGenerator.isTypeMethodName(expectedType)).string(LOCAL_VALUE).end().end().startBlock();
+            body.startReturn().startCall(null, TypeSystemCodeGenerator.asTypeMethodName(expectedType)).string(LOCAL_VALUE).end().end();
+            body.end(); // if-block
+            body.startThrow().startNew(getContext().getTruffleTypes().getUnexpectedValueException()).string(LOCAL_VALUE).end().end();
+
+            return method;
+        }
+    }
+}