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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/java/ArrayLengthNode.java @ 5060:4ed4295ce15f

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Update import statements.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 08 Mar 2012 19:11:12 +0100
parents ed559a528128
children
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1 /*
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2 * Copyright (c) 2009, 2011, 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.graal.nodes.java;
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24
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25 import com.oracle.max.cri.ci.*;
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26 import com.oracle.max.cri.ri.*;
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27 import com.oracle.graal.cri.*;
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28 import com.oracle.graal.nodes.*;
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29 import com.oracle.graal.nodes.spi.*;
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30 import com.oracle.graal.nodes.type.*;
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31
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32 /**
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33 * The {@code ArrayLength} instruction gets the length of an array.
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34 */
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35 public final class ArrayLengthNode extends FixedWithNextNode implements Canonicalizable, Lowerable, LIRLowerable {
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36
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37 @Input private ValueNode array;
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38
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39 public ValueNode array() {
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40 return array;
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41 }
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42
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43 public ArrayLengthNode(ValueNode array) {
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44 super(StampFactory.intValue());
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45 this.array = array;
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46 }
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47
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48 @Override
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49 public void generate(LIRGeneratorTool gen) {
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50 gen.visitArrayLength(this);
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51 }
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52
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53 @Override
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54 public ValueNode canonical(CanonicalizerTool tool) {
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55 if (array() instanceof NewArrayNode) {
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56 ValueNode length = ((NewArrayNode) array()).dimension(0);
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57 assert length != null;
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58 return length;
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59 }
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60 CiConstant constantValue = null;
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61 if (array().isConstant() && !array().isNullConstant()) {
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62 constantValue = array().asConstant();
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63 if (constantValue != null && constantValue.isNonNull()) {
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64 RiRuntime runtime = tool.runtime();
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65 return ConstantNode.forInt(runtime.getArrayLength(constantValue), graph());
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66 }
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67 }
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68 return this;
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69 }
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71 @Override
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72 public void lower(CiLoweringTool tool) {
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73 tool.getRuntime().lower(this, tool);
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74 }
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75 }