protected Symtab(Context context) throws CompletionFailure {
        context.put(symtabKey, this);

        names = Name.Table.instance(context);
        target = Target.instance(context);

        // Create the unknown type
        unknownType = new Type(TypeTags.UNKNOWN, null);

        // create the basic builtin symbols
        rootPackage = new PackageSymbol(names.empty, null);
        final Messages messages = Messages.instance(context);
        unnamedPackage = new PackageSymbol(names.empty, rootPackage) {
                public String toString() {
                    return messages.getLocalizedString("compiler.misc.unnamed.package");
                }
            };
        noSymbol = new TypeSymbol(0, names.empty, Type.noType, rootPackage);
        noSymbol.kind = Kinds.NIL;

        // create the error symbols
        errSymbol = new ClassSymbol(PUBLIC|STATIC|ACYCLIC, names.any, null, rootPackage);
        errType = new ErrorType(errSymbol);

        // initialize builtin types
        initType(byteType, "byte", "Byte");
        initType(shortType, "short", "Short");
        initType(charType, "char", "Character");
        initType(intType, "int", "Integer");
        initType(longType, "long", "Long");
        initType(floatType, "float", "Float");
        initType(doubleType, "double", "Double");
        initType(booleanType, "boolean", "Boolean");
        initType(voidType, "void", "Void");
        initType(botType, "<nulltype>");
        initType(errType, errSymbol);
        initType(unknownType, "<any?>");

        // the builtin class of all arrays
        arrayClass = new ClassSymbol(PUBLIC|ACYCLIC, names.Array, noSymbol);

        // VGJ
        boundClass = new ClassSymbol(PUBLIC|ACYCLIC, names.Bound, noSymbol);

        // the builtin class of all methods
        methodClass = new ClassSymbol(PUBLIC|ACYCLIC, names.Method, noSymbol);

        // Create class to hold all predefined constants and operations.
        predefClass = new ClassSymbol(PUBLIC|ACYCLIC, names.empty, rootPackage);
        Scope scope = new Scope(predefClass);
        predefClass.members_field = scope;

        // Enter symbols for basic types.
        scope.enter(byteType.tsym);
        scope.enter(shortType.tsym);
        scope.enter(charType.tsym);
        scope.enter(intType.tsym);
        scope.enter(longType.tsym);
        scope.enter(floatType.tsym);
        scope.enter(doubleType.tsym);
        scope.enter(booleanType.tsym);
        scope.enter(errType.tsym);

        classes.put(predefClass.fullname, predefClass);

        reader = ClassReader.instance(context);
        reader.init(this);

        // Enter predefined classes.
        objectType = enterClass("java.lang.Object");
        classType = enterClass("java.lang.Class");
        stringType = enterClass("java.lang.String");
        stringBufferType = enterClass("java.lang.StringBuffer");
        stringBuilderType = enterClass("java.lang.StringBuilder");
        cloneableType = enterClass("java.lang.Cloneable");
        throwableType = enterClass("java.lang.Throwable");
        serializableType = enterClass("java.io.Serializable");
        errorType = enterClass("java.lang.Error");
        illegalArgumentExceptionType = enterClass("java.lang.IllegalArgumentException");
        exceptionType = enterClass("java.lang.Exception");
        runtimeExceptionType = enterClass("java.lang.RuntimeException");
        classNotFoundExceptionType = enterClass("java.lang.ClassNotFoundException");
        noClassDefFoundErrorType = enterClass("java.lang.NoClassDefFoundError");
        noSuchFieldErrorType = enterClass("java.lang.NoSuchFieldError");
        assertionErrorType = enterClass("java.lang.AssertionError");
        cloneNotSupportedExceptionType = enterClass("java.lang.CloneNotSupportedException");
        annotationType = enterClass("java.lang.annotation.Annotation");
        classLoaderType = enterClass("java.lang.ClassLoader");
        enumSym = reader.enterClass(names.java_lang_Enum);
        enumFinalFinalize =
            new MethodSymbol(PROTECTED|FINAL|HYPOTHETICAL,
                             names.finalize,
                             new MethodType(List.<Type>nil(), voidType,
                                            List.<Type>nil(), methodClass),
                             enumSym);
        listType = enterClass("java.util.List");
        collectionsType = enterClass("java.util.Collections");
        comparableType = enterClass("java.lang.Comparable");
        arraysType = enterClass("java.util.Arrays");
        iterableType = target.hasIterable()
            ? enterClass("java.lang.Iterable")
            : enterClass("java.util.Collection");
        iteratorType = enterClass("java.util.Iterator");
        annotationTargetType = enterClass("java.lang.annotation.Target");
        overrideType = enterClass("java.lang.Override");
        retentionType = enterClass("java.lang.annotation.Retention");
        deprecatedType = enterClass("java.lang.Deprecated");
        suppressWarningsType = enterClass("java.lang.SuppressWarnings");
        inheritedType = enterClass("java.lang.annotation.Inherited");
        systemType = enterClass("java.lang.System");

        synthesizeEmptyInterfaceIfMissing(cloneableType);
        synthesizeEmptyInterfaceIfMissing(serializableType);
        synthesizeBoxTypeIfMissing(doubleType);
        synthesizeBoxTypeIfMissing(floatType);

        // Enter a synthetic class that is used to mark internal
        // proprietary classes in ct.sym.  This class does not have a
        // class file.
        ClassType proprietaryType = (ClassType)enterClass("sun.Proprietary+Annotation");
        this.proprietaryType = proprietaryType;
        ClassSymbol proprietarySymbol = (ClassSymbol)proprietaryType.tsym;
        proprietarySymbol.completer = null;
        proprietarySymbol.flags_field = PUBLIC|ACYCLIC|ANNOTATION|INTERFACE;
        proprietarySymbol.erasure_field = proprietaryType;
        proprietarySymbol.members_field = new Scope(proprietarySymbol);
        proprietaryType.typarams_field = List.nil();
        proprietaryType.allparams_field = List.nil();
        proprietaryType.supertype_field = annotationType;
        proprietaryType.interfaces_field = List.nil();

        // Enter a class for arrays.
        // The class implements java.lang.Cloneable and java.io.Serializable.
        // It has a final length field and a clone method.
        ClassType arrayClassType = (ClassType)arrayClass.type;
        arrayClassType.supertype_field = objectType;
        arrayClassType.interfaces_field = List.of(cloneableType, serializableType);
        arrayClass.members_field = new Scope(arrayClass);
        lengthVar = new VarSymbol(
            PUBLIC | FINAL,
            names.length,
            intType,
            arrayClass);
        arrayClass.members().enter(lengthVar);
        arrayCloneMethod = new MethodSymbol(
            PUBLIC,
            names.clone,
            new MethodType(List.<Type>nil(), objectType,
                           List.<Type>nil(), methodClass),
            arrayClass);
        arrayClass.members().enter(arrayCloneMethod);

        // Enter operators.
        enterUnop("+", doubleType, doubleType, nop);
        enterUnop("+", floatType, floatType, nop);
        enterUnop("+", longType, longType, nop);
        enterUnop("+", intType, intType, nop);

        enterUnop("-", doubleType, doubleType, dneg);
        enterUnop("-", floatType, floatType, fneg);
        enterUnop("-", longType, longType, lneg);
        enterUnop("-", intType, intType, ineg);

        enterUnop("~", longType, longType, lxor);
        enterUnop("~", intType, intType, ixor);

        enterUnop("++", doubleType, doubleType, dadd);
        enterUnop("++", floatType, floatType, fadd);
        enterUnop("++", longType, longType, ladd);
        enterUnop("++", intType, intType, iadd);
        enterUnop("++", charType, charType, iadd);
        enterUnop("++", shortType, shortType, iadd);
        enterUnop("++", byteType, byteType, iadd);

        enterUnop("--", doubleType, doubleType, dsub);
        enterUnop("--", floatType, floatType, fsub);
        enterUnop("--", longType, longType, lsub);
        enterUnop("--", intType, intType, isub);
        enterUnop("--", charType, charType, isub);
        enterUnop("--", shortType, shortType, isub);
        enterUnop("--", byteType, byteType, isub);

        enterUnop("!", booleanType, booleanType, bool_not);
        nullcheck = enterUnop("<*nullchk*>", objectType, objectType, nullchk);

        // string concatenation
        enterBinop("+", stringType, objectType, stringType, string_add);
        enterBinop("+", objectType, stringType, stringType, string_add);
        enterBinop("+", stringType, stringType, stringType, string_add);
        enterBinop("+", stringType, intType, stringType, string_add);
        enterBinop("+", stringType, longType, stringType, string_add);
        enterBinop("+", stringType, floatType, stringType, string_add);
        enterBinop("+", stringType, doubleType, stringType, string_add);
        enterBinop("+", stringType, booleanType, stringType, string_add);
        enterBinop("+", stringType, botType, stringType, string_add);
        enterBinop("+", intType, stringType, stringType, string_add);
        enterBinop("+", longType, stringType, stringType, string_add);
        enterBinop("+", floatType, stringType, stringType, string_add);
        enterBinop("+", doubleType, stringType, stringType, string_add);
        enterBinop("+", booleanType, stringType, stringType, string_add);
        enterBinop("+", botType, stringType, stringType, string_add);

        // these errors would otherwise be matched as string concatenation
        enterBinop("+", botType, botType, botType, error);
        enterBinop("+", botType, intType, botType, error);
        enterBinop("+", botType, longType, botType, error);
        enterBinop("+", botType, floatType, botType, error);
        enterBinop("+", botType, doubleType, botType, error);
        enterBinop("+", botType, booleanType, botType, error);
        enterBinop("+", botType, objectType, botType, error);
        enterBinop("+", intType, botType, botType, error);
        enterBinop("+", longType, botType, botType, error);
        enterBinop("+", floatType, botType, botType, error);
        enterBinop("+", doubleType, botType, botType, error);
        enterBinop("+", booleanType, botType, botType, error);
        enterBinop("+", objectType, botType, botType, error);

        enterBinop("+", doubleType, doubleType, doubleType, dadd);
        enterBinop("+", floatType, floatType, floatType, fadd);
        enterBinop("+", longType, longType, longType, ladd);
        enterBinop("+", intType, intType, intType, iadd);

        enterBinop("-", doubleType, doubleType, doubleType, dsub);
        enterBinop("-", floatType, floatType, floatType, fsub);
        enterBinop("-", longType, longType, longType, lsub);
        enterBinop("-", intType, intType, intType, isub);

        enterBinop("*", doubleType, doubleType, doubleType, dmul);
        enterBinop("*", floatType, floatType, floatType, fmul);
        enterBinop("*", longType, longType, longType, lmul);
        enterBinop("*", intType, intType, intType, imul);

        enterBinop("/", doubleType, doubleType, doubleType, ddiv);
        enterBinop("/", floatType, floatType, floatType, fdiv);
        enterBinop("/", longType, longType, longType, ldiv);
        enterBinop("/", intType, intType, intType, idiv);

        enterBinop("%", doubleType, doubleType, doubleType, dmod);
        enterBinop("%", floatType, floatType, floatType, fmod);
        enterBinop("%", longType, longType, longType, lmod);
        enterBinop("%", intType, intType, intType, imod);

        enterBinop("&", booleanType, booleanType, booleanType, iand);
        enterBinop("&", longType, longType, longType, land);
        enterBinop("&", intType, intType, intType, iand);

        enterBinop("|", booleanType, booleanType, booleanType, ior);
        enterBinop("|", longType, longType, longType, lor);
        enterBinop("|", intType, intType, intType, ior);

        enterBinop("^", booleanType, booleanType, booleanType, ixor);
        enterBinop("^", longType, longType, longType, lxor);
        enterBinop("^", intType, intType, intType, ixor);

        enterBinop("<<", longType, longType, longType, lshll);
        enterBinop("<<", intType, longType, intType, ishll);
        enterBinop("<<", longType, intType, longType, lshl);
        enterBinop("<<", intType, intType, intType, ishl);

        enterBinop(">>", longType, longType, longType, lshrl);
        enterBinop(">>", intType, longType, intType, ishrl);
        enterBinop(">>", longType, intType, longType, lshr);
        enterBinop(">>", intType, intType, intType, ishr);

        enterBinop(">>>", longType, longType, longType, lushrl);
        enterBinop(">>>", intType, longType, intType, iushrl);
        enterBinop(">>>", longType, intType, longType, lushr);
        enterBinop(">>>", intType, intType, intType, iushr);

        enterBinop("<", doubleType, doubleType, booleanType, dcmpg, iflt);
        enterBinop("<", floatType, floatType, booleanType, fcmpg, iflt);
        enterBinop("<", longType, longType, booleanType, lcmp, iflt);
        enterBinop("<", intType, intType, booleanType, if_icmplt);

        enterBinop(">", doubleType, doubleType, booleanType, dcmpl, ifgt);
        enterBinop(">", floatType, floatType, booleanType, fcmpl, ifgt);
        enterBinop(">", longType, longType, booleanType, lcmp, ifgt);
        enterBinop(">", intType, intType, booleanType, if_icmpgt);

        enterBinop("<=", doubleType, doubleType, booleanType, dcmpg, ifle);
        enterBinop("<=", floatType, floatType, booleanType, fcmpg, ifle);
        enterBinop("<=", longType, longType, booleanType, lcmp, ifle);
        enterBinop("<=", intType, intType, booleanType, if_icmple);

        enterBinop(">=", doubleType, doubleType, booleanType, dcmpl, ifge);
        enterBinop(">=", floatType, floatType, booleanType, fcmpl, ifge);
        enterBinop(">=", longType, longType, booleanType, lcmp, ifge);
        enterBinop(">=", intType, intType, booleanType, if_icmpge);

        enterBinop("==", objectType, objectType, booleanType, if_acmpeq);
        enterBinop("==", booleanType, booleanType, booleanType, if_icmpeq);
        enterBinop("==", doubleType, doubleType, booleanType, dcmpl, ifeq);
        enterBinop("==", floatType, floatType, booleanType, fcmpl, ifeq);
        enterBinop("==", longType, longType, booleanType, lcmp, ifeq);
        enterBinop("==", intType, intType, booleanType, if_icmpeq);

        enterBinop("!=", objectType, objectType, booleanType, if_acmpne);
        enterBinop("!=", booleanType, booleanType, booleanType, if_icmpne);
        enterBinop("!=", doubleType, doubleType, booleanType, dcmpl, ifne);
        enterBinop("!=", floatType, floatType, booleanType, fcmpl, ifne);
        enterBinop("!=", longType, longType, booleanType, lcmp, ifne);
        enterBinop("!=", intType, intType, booleanType, if_icmpne);

        enterBinop("#", objectType, objectType, booleanType, if_acmpne);
        enterBinop("#", booleanType, booleanType, booleanType, if_icmpne);
        enterBinop("#", doubleType, doubleType, booleanType, dcmpl, ifne);
        enterBinop("#", floatType, floatType, booleanType, fcmpl, ifne);
        enterBinop("#", longType, longType, booleanType, lcmp, ifne);
        enterBinop("#", intType, intType, booleanType, if_icmpne);

        enterBinop("&&", booleanType, booleanType, booleanType, bool_and);
        enterBinop("||", booleanType, booleanType, booleanType, bool_or);
    }