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annotate graal/Compiler/src/com/sun/c1x/ir/ArrayLength.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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2507
9ec15d6914ca Pull over of compiler from maxine repository.
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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.sun.c1x.ir;
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24
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25 import com.sun.c1x.debug.*;
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26 import com.sun.c1x.util.*;
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27 import com.sun.c1x.value.*;
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28 import com.sun.cri.bytecode.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * The {@code ArrayLength} instruction gets the length of an array.
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33 *
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34 * @author Ben L. Titzer
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35 */
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36 public final class ArrayLength extends AccessArray {
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37
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38 /**
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39 * Constructs a new ArrayLength instruction.
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40 * @param array the instruction producing the array
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41 * @param newFrameState the state before executing this instruction
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42 */
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43 public ArrayLength(Value array, FrameState newFrameState) {
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44 super(CiKind.Int, array, newFrameState);
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45 if (array.isNonNull()) {
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46 eliminateNullCheck();
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47 }
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48 }
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49
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50 /**
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51 * Clears the state associated with a null check.
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52 */
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53 @Override
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54 public void runtimeCheckCleared() {
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55 if (!needsNullCheck()) {
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56 clearState();
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57 }
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58 }
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59
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60 /**
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61 * Checks whether this instruction can cause a trap.
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62 * @return {@code true} if this instruction can cause a trap
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63 */
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64 @Override
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65 public boolean canTrap() {
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66 return needsNullCheck();
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67 }
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68
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69 @Override
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70 public void accept(ValueVisitor v) {
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71 v.visitArrayLength(this);
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72 }
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73
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74 @Override
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75 public int valueNumber() {
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76 return Util.hash1(Bytecodes.ARRAYLENGTH, array);
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77 }
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78
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79 @Override
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80 public boolean valueEqual(Instruction i) {
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81 if (i instanceof ArrayLength) {
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82 ArrayLength o = (ArrayLength) i;
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83 return array == o.array;
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84 }
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85 return false;
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86 }
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87
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88 @Override
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89 public void print(LogStream out) {
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90 out.print(array).print(".length");
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91 }
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92 }