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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.nodes.objects;
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11
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12 import java.math.*;
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13
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14 import com.oracle.truffle.api.*;
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15 import com.oracle.truffle.api.frame.*;
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16 import com.oracle.truffle.api.nodes.*;
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17 import com.oracle.truffle.ruby.nodes.*;
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18 import com.oracle.truffle.ruby.runtime.*;
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19 import com.oracle.truffle.ruby.runtime.objects.*;
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20
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21 /**
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22 * Reads the singleton (meta, eigen) class of an object.
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23 */
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24 @NodeInfo(shortName = "singleton")
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25 public class SingletonClassNode extends RubyNode {
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26
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27 @Child protected RubyNode child;
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28
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29 public SingletonClassNode(RubyContext context, SourceSection sourceSection, RubyNode child) {
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30 super(context, sourceSection);
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31 this.child = adoptChild(child);
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32 }
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33
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34 @Override
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35 public Object execute(VirtualFrame frame) {
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36 final Object childResult = child.execute(frame);
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37
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38 final RubyContext context = getContext();
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39
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40 if (childResult instanceof NilPlaceholder) {
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41 return context.getCoreLibrary().getNilClass();
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42 } else if (childResult instanceof BigInteger) {
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43 // TODO(CS): this is problematic - do Bignums have singletons or not?
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44 return context.getCoreLibrary().box(childResult).getSingletonClass();
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45 } else {
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46 return ((RubyBasicObject) childResult).getSingletonClass();
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47 }
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48 }
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49
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50 }
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