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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotNmethod.java @ 24138:b01354ea98ec

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bring jvmci-8 more into sync with jvmci-9
author Doug Simon <doug.simon@oracle.com>
date Mon, 12 Jun 2017 15:23:09 +0200
parents 1bbd4a7c274b
children
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1 /*
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2 * Copyright (c) 2011, 2015, 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 jdk.vm.ci.hotspot;
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24
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25 import static jdk.vm.ci.hotspot.CompilerToVM.compilerToVM;
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26 import jdk.vm.ci.code.InstalledCode;
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27 import jdk.vm.ci.code.InvalidInstalledCodeException;
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28 import jdk.vm.ci.meta.JavaKind;
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29 import jdk.vm.ci.meta.JavaType;
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30 import jdk.vm.ci.meta.ResolvedJavaMethod;
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31
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32 /**
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33 * Implementation of {@link InstalledCode} for code installed as an nmethod. The nmethod stores a
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34 * weak reference to an instance of this class. This is necessary to keep the nmethod from being
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35 * unloaded while the associated {@link HotSpotNmethod} instance is alive.
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36 * <p>
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37 * Note that there is no (current) way for the reference from an nmethod to a {@link HotSpotNmethod}
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38 * instance to be anything but weak. This is due to the fact that HotSpot does not treat nmethods as
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39 * strong GC roots.
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40 */
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41 public class HotSpotNmethod extends HotSpotInstalledCode {
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42
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43 /**
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44 * This (indirect) Method* reference is safe since class redefinition preserves all methods
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45 * associated with nmethods in the code cache.
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46 */
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47 private final HotSpotResolvedJavaMethod method;
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48
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49 private final boolean isDefault;
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50
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51 public HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault) {
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52 super(name);
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53 this.method = method;
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54 this.isDefault = isDefault;
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55 }
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56
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57 public boolean isDefault() {
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58 return isDefault;
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59 }
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60
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61 public ResolvedJavaMethod getMethod() {
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62 return method;
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63 }
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64
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65 @Override
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66 public void invalidate() {
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67 compilerToVM().invalidateInstalledCode(this);
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68 }
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69
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70 @Override
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71 public String toString() {
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72 return String.format("InstalledNmethod[method=%s, codeBlob=0x%x, isDefault=%b, name=%s]", method, getAddress(), isDefault, name);
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73 }
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74
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75 protected boolean checkThreeObjectArgs() {
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76 assert method.getSignature().getParameterCount(!method.isStatic()) == 3;
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77 assert method.getSignature().getParameterKind(0) == JavaKind.Object;
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78 assert method.getSignature().getParameterKind(1) == JavaKind.Object;
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79 assert !method.isStatic() || method.getSignature().getParameterKind(2) == JavaKind.Object;
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80 return true;
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81 }
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82
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83 private boolean checkArgs(Object... args) {
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84 JavaType[] sig = method.toParameterTypes();
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85 assert args.length == sig.length : method.format("%H.%n(%p): expected ") + sig.length + " args, got " + args.length;
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86 for (int i = 0; i < sig.length; i++) {
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87 Object arg = args[i];
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88 if (arg == null) {
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89 assert sig[i].getJavaKind() == JavaKind.Object : method.format("%H.%n(%p): expected arg ") + i + " to be Object, not " + sig[i];
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90 } else if (sig[i].getJavaKind() != JavaKind.Object) {
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91 assert sig[i].getJavaKind().toBoxedJavaClass() == arg.getClass() : method.format("%H.%n(%p): expected arg ") + i + " to be " + sig[i] + ", not " + arg.getClass();
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92 }
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93 }
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94 return true;
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95 }
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96
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97 @Override
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98 public Object executeVarargs(Object... args) throws InvalidInstalledCodeException {
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99 assert checkArgs(args);
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100 return compilerToVM().executeInstalledCode(args, this);
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101 }
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102
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103 @Override
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104 public long getStart() {
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105 return isValid() ? super.getStart() : 0;
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106 }
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107 }