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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/stubs/NewArrayStub.java @ 9015:92d2bedb5dfc

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Change of Snippet template and instantiation process
author Christian Wimmer <christian.wimmer@oracle.com>
date Thu, 11 Apr 2013 14:22:03 -0700
parents ce5750014c3d
children 0266549ff6e0
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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.replacements.HotSpotSnippetUtils.*;
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26 import static com.oracle.graal.hotspot.replacements.NewObjectSnippets.*;
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27 import static com.oracle.graal.hotspot.stubs.NewInstanceStub.*;
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28
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29 import com.oracle.graal.api.code.*;
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30 import com.oracle.graal.hotspot.*;
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31 import com.oracle.graal.hotspot.meta.*;
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32 import com.oracle.graal.hotspot.nodes.*;
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33 import com.oracle.graal.hotspot.replacements.*;
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34 import com.oracle.graal.nodes.spi.*;
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35 import com.oracle.graal.replacements.*;
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36 import com.oracle.graal.replacements.Snippet.ConstantParameter;
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37 import com.oracle.graal.replacements.SnippetTemplate.Arguments;
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38 import com.oracle.graal.replacements.SnippetTemplate.SnippetInfo;
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39 import com.oracle.graal.word.*;
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40
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41 /**
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42 * Stub implementing the fast path for TLAB refill during instance class allocation. This stub is
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43 * called from the {@linkplain NewObjectSnippets inline} allocation code when TLAB allocation fails.
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44 * If this stub fails to refill the TLAB or allocate the object, it calls out to the HotSpot C++
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45 * runtime for to complete the allocation.
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46 */
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47 public class NewArrayStub extends Stub {
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48
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49 public NewArrayStub(final HotSpotRuntime runtime, Replacements replacements, TargetDescription target, HotSpotRuntimeCallTarget linkage) {
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50 super(runtime, replacements, target, linkage, "newArray");
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51 }
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52
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53 @Override
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54 protected Arguments makeArguments(SnippetInfo stub) {
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55 HotSpotResolvedObjectType intArrayType = (HotSpotResolvedObjectType) runtime.lookupJavaType(int[].class);
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56
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57 Arguments args = new Arguments(stub);
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58 args.add("hub", null);
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59 args.add("length", null);
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60 args.addConst("intArrayHub", intArrayType.klass());
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61 args.addConst("log", Boolean.getBoolean("graal.logNewArrayStub"));
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62 return args;
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63 }
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64
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65 /**
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66 * Re-attempts allocation after an initial TLAB allocation failed or was skipped (e.g., due to
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67 * -XX:-UseTLAB).
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68 *
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69 * @param hub the hub of the object to be allocated
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70 * @param length the length of the array
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71 * @param intArrayHub the hub for {@code int[].class}
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72 * @param log specifies if logging is enabled
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73 */
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74 @Snippet
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75 private static Object newArray(Word hub, int length, @ConstantParameter Word intArrayHub, @ConstantParameter boolean log) {
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76 int layoutHelper = hub.readInt(layoutHelperOffset(), FINAL_LOCATION);
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77 int log2ElementSize = (layoutHelper >> layoutHelperLog2ElementSizeShift()) & layoutHelperLog2ElementSizeMask();
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78 int headerSize = (layoutHelper >> layoutHelperHeaderSizeShift()) & layoutHelperHeaderSizeMask();
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79 int elementKind = (layoutHelper >> layoutHelperElementTypeShift()) & layoutHelperElementTypeMask();
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80 int sizeInBytes = computeArrayAllocationSize(length, wordSize(), headerSize, log2ElementSize);
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81 log(log, "newArray: element kind %d\n", elementKind);
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82 log(log, "newArray: array length %d\n", length);
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83 log(log, "newArray: array size %d\n", sizeInBytes);
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84 log(log, "newArray: hub=%p\n", hub);
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85
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86 // check that array length is small enough for fast path.
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87 if (length <= MAX_ARRAY_FAST_PATH_ALLOCATION_LENGTH) {
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88 Word memory = refillAllocate(intArrayHub, sizeInBytes, log);
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89 if (memory.notEqual(0)) {
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90 log(log, "newArray: allocated new array at %p\n", memory);
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91 formatArray(hub, sizeInBytes, length, headerSize, memory, Word.unsigned(arrayPrototypeMarkWord()), true);
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92 return verifyOop(memory.toObject());
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93 }
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94 }
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95 log(log, "newArray: calling new_array_slow", 0L);
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96 return verifyOop(NewArraySlowStubCall.call(hub, length));
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97 }
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98 }