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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.methods.arguments;
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11
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12 import com.oracle.truffle.api.*;
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13 import com.oracle.truffle.api.frame.*;
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14 import com.oracle.truffle.api.nodes.*;
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15 import com.oracle.truffle.api.utilities.*;
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16 import com.oracle.truffle.ruby.nodes.*;
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17 import com.oracle.truffle.ruby.runtime.*;
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18
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19 /**
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20 * Read an optional argument.
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21 */
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22 @NodeInfo(shortName = "read-optional-argument")
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23 public class ReadOptionalArgumentNode extends RubyNode {
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24
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25 private final int index;
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26 private final int minimum;
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27 @Child protected RubyNode defaultValue;
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28
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29 private final BranchProfile defaultValueProfile = new BranchProfile();
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30
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31 public ReadOptionalArgumentNode(RubyContext context, SourceSection sourceSection, int index, int minimum, RubyNode defaultValue) {
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32 super(context, sourceSection);
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33 this.index = index;
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34 this.minimum = minimum;
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35 this.defaultValue = adoptChild(defaultValue);
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36 }
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37
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38 @Override
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39 public Object execute(VirtualFrame frame) {
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40 final Object[] arguments = frame.getArguments(RubyArguments.class).getArguments();
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41
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42 if (arguments.length < minimum) {
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43 defaultValueProfile.enter();
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44 return defaultValue.execute(frame);
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45 } else {
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46 assert index < arguments.length;
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47 return arguments[index];
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48 }
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49 }
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50
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51 }
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