SingletonClassNode.java

/*
 * Copyright (c) 2013, 2014 Oracle and/or its affiliates. All rights reserved. This
 * code is released under a tri EPL/GPL/LGPL license. You can use it,
 * redistribute it and/or modify it under the terms of the:
 *
 * Eclipse Public License version 1.0
 * GNU General Public License version 2
 * GNU Lesser General Public License version 2.1
 */
package org.jruby.truffle.nodes.objects;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.source.SourceSection;
import org.jruby.truffle.nodes.RubyNode;
import org.jruby.truffle.runtime.RubyContext;
import org.jruby.truffle.runtime.control.RaiseException;
import org.jruby.truffle.runtime.core.RubyBasicObject;
import org.jruby.truffle.runtime.core.RubyClass;

/**
 * Reads the singleton (meta, eigen) class of an object.
 */
@NodeChild(value="object", type=RubyNode.class)
public abstract class SingletonClassNode extends RubyNode {

    public SingletonClassNode(RubyContext context, SourceSection sourceSection) {
        super(context, sourceSection);
    }

    public SingletonClassNode(SingletonClassNode prev) {
        super(prev);
    }

    public abstract RubyClass executeSingletonClass(Object value);

    @Specialization(guards = "isTrue")
    protected RubyClass singletonClassTrue(boolean value) {
        return getContext().getCoreLibrary().getTrueClass();
    }

    @Specialization(guards = "!isTrue")
    protected RubyClass singletonClassFalse(boolean value) {
        return getContext().getCoreLibrary().getFalseClass();
    }

    @Specialization
    protected Object singletonClass(int value) {
        CompilerDirectives.transferToInterpreter();
        throw new RaiseException(getContext().getCoreLibrary().typeErrorCantDefineSingleton(this));
    }

    @Specialization
    protected Object singletonClass(long value) {
        CompilerDirectives.transferToInterpreter();
        throw new RaiseException(getContext().getCoreLibrary().typeErrorCantDefineSingleton(this));
    }

    @Specialization
    protected Object singletonClass(double value) {
        CompilerDirectives.transferToInterpreter();
        throw new RaiseException(getContext().getCoreLibrary().typeErrorCantDefineSingleton(this));
    }

    @Specialization
    protected RubyClass singletonClass(RubyBasicObject object) {
        return object.getSingletonClass(this);
    }

}