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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/stubs/NewArrayStub.java @ 14101:2ec05c3f773b

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fix overzeroing of new storage, refactor zeroing and unroll zeroing of small arrays
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Thu, 06 Mar 2014 18:41:42 -0800
parents 75a67ebd50e8
children 390d72c7cc04
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1 /*
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2 * Copyright (c) 2012, 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.hotspot.stubs;
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24
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25 import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*;
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26 import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*;
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27 import static com.oracle.graal.hotspot.replacements.NewObjectSnippets.*;
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28 import static com.oracle.graal.hotspot.stubs.NewInstanceStub.*;
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29 import static com.oracle.graal.hotspot.stubs.StubUtil.*;
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30
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31 import com.oracle.graal.api.code.*;
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32 import com.oracle.graal.api.meta.*;
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33 import com.oracle.graal.graph.Node.ConstantNodeParameter;
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34 import com.oracle.graal.graph.Node.NodeIntrinsic;
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35 import com.oracle.graal.hotspot.*;
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36 import com.oracle.graal.hotspot.meta.*;
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37 import com.oracle.graal.hotspot.nodes.*;
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38 import com.oracle.graal.hotspot.replacements.*;
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39 import com.oracle.graal.nodes.StructuredGraph.GuardsStage;
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40 import com.oracle.graal.nodes.spi.*;
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41 import com.oracle.graal.replacements.*;
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42 import com.oracle.graal.replacements.Snippet.ConstantParameter;
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43 import com.oracle.graal.replacements.Snippet.Fold;
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44 import com.oracle.graal.replacements.SnippetTemplate.Arguments;
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45 import com.oracle.graal.replacements.SnippetTemplate.SnippetInfo;
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46 import com.oracle.graal.word.*;
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47
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48 /**
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49 * Stub implementing the fast path for TLAB refill during instance class allocation. This stub is
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50 * called via {@link NewArrayStubCall} from the {@linkplain NewObjectSnippets inline} allocation
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51 * code when TLAB allocation fails. If this stub fails to refill the TLAB or allocate the object, it
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52 * calls out to the HotSpot C++ runtime to complete the allocation.
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53 */
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54 public class NewArrayStub extends SnippetStub {
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55
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56 public NewArrayStub(HotSpotProviders providers, TargetDescription target, HotSpotForeignCallLinkage linkage) {
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57 super(providers, target, linkage);
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58 }
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59
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60 @Override
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61 protected Arguments makeArguments(SnippetInfo stub) {
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62 HotSpotResolvedObjectType intArrayType = (HotSpotResolvedObjectType) providers.getMetaAccess().lookupJavaType(int[].class);
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63
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64 // RuntimeStub cannot (currently) support oops or metadata embedded in the code so we
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65 // convert the hub (i.e., Klass*) for int[] to be a naked word. This should be safe since
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66 // the int[] class will never be unloaded.
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67 Constant intArrayHub = intArrayType.klass();
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68 intArrayHub = Constant.forIntegerKind(runtime().getTarget().wordKind, intArrayHub.asLong(), null);
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69
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70 Arguments args = new Arguments(stub, GuardsStage.FLOATING_GUARDS, LoweringTool.StandardLoweringStage.HIGH_TIER);
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71 args.add("hub", null);
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72 args.add("length", null);
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73 args.addConst("intArrayHub", intArrayHub);
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74 args.addConst("threadRegister", providers.getRegisters().getThreadRegister());
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75 return args;
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76 }
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77
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78 @Fold
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79 private static boolean logging() {
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80 return Boolean.getBoolean("graal.logNewArrayStub");
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81 }
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82
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83 /**
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84 * Re-attempts allocation after an initial TLAB allocation failed or was skipped (e.g., due to
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85 * -XX:-UseTLAB).
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86 *
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87 * @param hub the hub of the object to be allocated
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88 * @param length the length of the array
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89 * @param intArrayHub the hub for {@code int[].class}
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90 */
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91 @Snippet
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92 private static Object newArray(Word hub, int length, @ConstantParameter Word intArrayHub, @ConstantParameter Register threadRegister) {
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93 int layoutHelper = hub.readInt(klassLayoutHelperOffset(), LocationIdentity.FINAL_LOCATION);
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94 int log2ElementSize = (layoutHelper >> layoutHelperLog2ElementSizeShift()) & layoutHelperLog2ElementSizeMask();
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95 int headerSize = (layoutHelper >> layoutHelperHeaderSizeShift()) & layoutHelperHeaderSizeMask();
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96 int elementKind = (layoutHelper >> layoutHelperElementTypeShift()) & layoutHelperElementTypeMask();
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97 int sizeInBytes = computeArrayAllocationSize(length, wordSize(), headerSize, log2ElementSize);
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98 if (logging()) {
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99 printf("newArray: element kind %d\n", elementKind);
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100 printf("newArray: array length %d\n", length);
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101 printf("newArray: array size %d\n", sizeInBytes);
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102 printf("newArray: hub=%p\n", hub.rawValue());
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103 }
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104
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105 // check that array length is small enough for fast path.
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106 Word thread = registerAsWord(threadRegister);
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107 if (length <= MAX_ARRAY_FAST_PATH_ALLOCATION_LENGTH) {
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108 Word memory = refillAllocate(thread, intArrayHub, sizeInBytes, logging());
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109 if (memory.notEqual(0)) {
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110 if (logging()) {
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111 printf("newArray: allocated new array at %p\n", memory.rawValue());
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112 }
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113 return verifyObject(formatArray(hub, sizeInBytes, length, headerSize, memory, Word.unsigned(arrayPrototypeMarkWord()), true, false));
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114 }
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115 }
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116 if (logging()) {
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117 printf("newArray: calling new_array_c\n");
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118 }
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119
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120 newArrayC(NEW_ARRAY_C, thread, hub, length);
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121 handlePendingException(thread, true);
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122 return verifyObject(getAndClearObjectResult(thread));
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123 }
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124
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125 public static final ForeignCallDescriptor NEW_ARRAY_C = descriptorFor(NewArrayStub.class, "newArrayC");
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126
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4391fd907278 use StubForeignCallNode within stubs, instead of ForeignCallNode
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127 @NodeIntrinsic(StubForeignCallNode.class)
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128 public static native void newArrayC(@ConstantNodeParameter ForeignCallDescriptor newArrayC, Word thread, Word hub, int length);
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129 }