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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/demo/SLAddWithoutSpecializationNode.java @ 16512:abe7128ca473

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SL: upgrade source attribution
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Mon, 14 Jul 2014 16:51:41 -0700
parents a08b8694f556
children
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1 /*
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2 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.sl.nodes.expression.demo;
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24
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25 import java.math.*;
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26
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27 import com.oracle.truffle.api.*;
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28 import com.oracle.truffle.api.dsl.*;
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29 import com.oracle.truffle.api.frame.*;
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30 import com.oracle.truffle.api.nodes.*;
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31 import com.oracle.truffle.sl.nodes.*;
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32 import com.oracle.truffle.sl.nodes.expression.*;
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33
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34 /**
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35 * This is an example how the add operation would be implemented without specializations and without
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36 * the Truffle DSL. Do not write such code in your language! See {@link SLAddNode} how the add
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37 * operation is implemented correctly.
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38 */
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39 public class SLAddWithoutSpecializationNode extends SLExpressionNode {
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40
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41 @Child private SLExpressionNode leftNode;
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42 @Child private SLExpressionNode rightNode;
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43
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44 public SLAddWithoutSpecializationNode(SLExpressionNode leftNode, SLExpressionNode rightNode) {
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45 super(null);
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46 this.leftNode = leftNode;
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47 this.rightNode = rightNode;
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48 }
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49
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50 @Override
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51 public Object executeGeneric(VirtualFrame frame) {
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52 /* Evaluate the child nodes. */
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53 Object left = leftNode.executeGeneric(frame);
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54 Object right = rightNode.executeGeneric(frame);
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55
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56 if (left instanceof Long && right instanceof Long) {
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57 /* Fast path of the arbitrary-precision arithmetic. We need to check for overflows */
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58 try {
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59 return ExactMath.addExact((Long) left, (Long) right);
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60 } catch (ArithmeticException ex) {
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61 /* Fall through to BigInteger case. */
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62 }
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63 }
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64
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65 /* Implicit type conversions. */
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66 if (left instanceof Long) {
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67 left = BigInteger.valueOf((Long) left);
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68 }
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69 if (right instanceof Long) {
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70 right = BigInteger.valueOf((Long) right);
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71 }
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72 if (left instanceof BigInteger && right instanceof BigInteger) {
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73 /* Slow path of the arbitrary-precision arithmetic. */
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74 return ((BigInteger) left).add((BigInteger) right);
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75 }
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76
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77 /* String concatenation if either the left or the right operand is a String. */
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78 if (left instanceof String || right instanceof String) {
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79 return left.toString() + right.toString();
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80 }
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81
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82 /* Type error. */
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83 throw new UnsupportedSpecializationException(this, new Node[]{leftNode, rightNode}, new Object[]{left, right});
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84 }
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85 }