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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/expression/demo/SLAddWithoutSpecializationNode.java @ 13883:ff3136ecb5a7

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SL: small changes
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 05 Feb 2014 03:16:21 -0800
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children f3e4f746e9c6
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1 package com.oracle.truffle.sl.nodes.expression.demo;
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2
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3 import java.math.*;
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4
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5 import com.oracle.truffle.api.*;
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6 import com.oracle.truffle.api.dsl.*;
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7 import com.oracle.truffle.api.frame.*;
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8 import com.oracle.truffle.api.nodes.*;
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9 import com.oracle.truffle.sl.nodes.*;
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10 import com.oracle.truffle.sl.nodes.expression.*;
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11
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12 /**
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13 * This is an example how the add operation would be implemented without specializations and without
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14 * the Truffle DSL. Do not write such code in your language! See {@link SLAddNode} how the add
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15 * operation is implemented correctly.
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16 */
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17 public class SLAddWithoutSpecializationNode extends SLExpressionNode {
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18
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19 @Child private SLExpressionNode leftNode;
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20 @Child private SLExpressionNode rightNode;
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21
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22 public SLAddWithoutSpecializationNode(SLExpressionNode leftNode, SLExpressionNode rightNode) {
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23 this.leftNode = adoptChild(leftNode);
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24 this.rightNode = adoptChild(rightNode);
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25 }
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26
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27 @Override
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28 public Object executeGeneric(VirtualFrame frame) {
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29 /* Evaluate the child nodes. */
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30 Object left = leftNode.executeGeneric(frame);
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31 Object right = rightNode.executeGeneric(frame);
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32
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33 if (left instanceof Long && right instanceof Long) {
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34 /* Fast path of the arbitrary-precision arithmetic. We need to check for overflows */
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35 try {
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36 return ExactMath.addExact((Long) left, (Long) right);
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37 } catch (ArithmeticException ex) {
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38 /* Fall through to BigInteger case. */
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39 }
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40 }
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41
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42 /* Implicit type conversions. */
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43 if (left instanceof Long) {
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44 left = BigInteger.valueOf((Long) left);
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45 }
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46 if (right instanceof Long) {
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47 right = BigInteger.valueOf((Long) right);
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48 }
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49 if (left instanceof BigInteger && right instanceof BigInteger) {
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50 /* Slow path of the arbitrary-precision arithmetic. */
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51 return ((BigInteger) left).add((BigInteger) right);
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52 }
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53
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54 /* String concatenation if either the left or the right operand is a String. */
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55 if (left instanceof String || right instanceof String) {
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56 return left.toString() + right.toString();
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57 }
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58
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59 /* Type error. */
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60 throw new UnsupportedSpecializationException(this, new Node[]{leftNode, rightNode}, new Object[]{left, right});
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61 }
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62 }