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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/NewArrayNode.java @ 13554:83fd2094ff66

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rework of monitorenter/exit (use MonitorIdNode)
author Lukas Stadler <lukas.stadler@jku.at>
date Wed, 08 Jan 2014 18:23:33 +0100
parents c6ab6ae1b360
children 61363577a184
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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 java.util.*;
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26
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27 import com.oracle.graal.api.meta.*;
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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 import com.oracle.graal.nodes.virtual.*;
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32
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33 /**
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34 * The {@code NewArrayNode} is used for all array allocations where the element type is know at
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35 * compile time.
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36 */
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37 public class NewArrayNode extends AbstractNewArrayNode implements VirtualizableAllocation {
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38
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39 /**
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40 * Constructs a new NewArrayNode.
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41 *
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42 * @param elementType the the type of the elements of the newly created array (not the type of
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43 * the array itself).
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44 * @param length the node that produces the length for this allocation.
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45 * @param fillContents determines whether the array elements should be initialized to zero/null.
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46 */
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47 public NewArrayNode(ResolvedJavaType elementType, ValueNode length, boolean fillContents) {
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48 super(StampFactory.exactNonNull(elementType.getArrayClass()), length, fillContents);
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49 }
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50
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51 /**
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52 * Gets the element type of the array.
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53 *
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54 * @return the element type of the array
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55 */
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56 public ResolvedJavaType elementType() {
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57 return ObjectStamp.typeOrNull(this).getComponentType();
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58 }
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59
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60 @Override
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61 public void virtualize(VirtualizerTool tool) {
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62 if (length().asConstant() != null) {
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63 final int constantLength = length().asConstant().asInt();
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64 if (constantLength >= 0 && constantLength < tool.getMaximumEntryCount()) {
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65 ValueNode[] state = new ValueNode[constantLength];
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66 ConstantNode defaultForKind = constantLength == 0 ? null : defaultElementValue();
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67 for (int i = 0; i < constantLength; i++) {
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68 state[i] = defaultForKind;
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69 }
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70 VirtualObjectNode virtualObject = new VirtualArrayNode(elementType(), constantLength);
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71 tool.createVirtualObject(virtualObject, state, Collections.<MonitorIdNode> emptyList());
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72 tool.replaceWithVirtual(virtualObject);
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73 }
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74 }
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75 }
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76
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77 /* Factored out in a separate method so that subclasses can override it. */
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78 protected ConstantNode defaultElementValue() {
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79 return ConstantNode.defaultForKind(elementType().getKind(), graph());
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80 }
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81 }