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annotate jvmci/jdk.internal.jvmci.hotspot/src/jdk/internal/jvmci/hotspot/HotSpotNmethod.java @ 22420:e3d9e0f9b50c

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cleaned up and added more javadoc to CompilerToVM (JDK-8133194)
author Doug Simon <doug.simon@oracle.com>
date Wed, 12 Aug 2015 17:46:38 +0200
parents 0e095e2c24e2
children dc1aeef79e7e
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1 /*
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2 * Copyright (c) 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 jdk.internal.jvmci.hotspot;
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24
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25 import static jdk.internal.jvmci.hotspot.HotSpotJVMCIRuntime.*;
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26 import jdk.internal.jvmci.code.*;
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27 import jdk.internal.jvmci.meta.*;
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28
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29 /**
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30 * Implementation of {@link InstalledCode} for code installed as an nmethod. The nmethod stores a
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31 * weak reference to an instance of this class. This is necessary to keep the nmethod from being
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32 * unloaded while the associated {@link HotSpotNmethod} instance is alive.
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33 * <p>
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34 * Note that there is no (current) way for the reference from an nmethod to a {@link HotSpotNmethod}
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35 * instance to be anything but weak. This is due to the fact that HotSpot does not treat nmethods as
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36 * strong GC roots.
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37 */
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38 public class HotSpotNmethod extends HotSpotInstalledCode {
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39
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40 /**
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41 * This (indirect) Method* reference is safe since class redefinition preserves all methods
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42 * associated with nmethods in the code cache.
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43 */
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44 private final HotSpotResolvedJavaMethod method;
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45
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46 private final boolean isDefault;
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47 private final boolean isExternal;
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48
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49 public HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault) {
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50 this(method, name, isDefault, false);
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51 }
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52
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53 public HotSpotNmethod(HotSpotResolvedJavaMethod method, String name, boolean isDefault, boolean isExternal) {
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54 super(name);
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55 this.method = method;
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56 this.isDefault = isDefault;
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57 this.isExternal = isExternal;
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58 }
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59
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60 public boolean isDefault() {
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61 return isDefault;
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62 }
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63
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64 public boolean isExternal() {
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65 return isExternal;
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66 }
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67
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68 public ResolvedJavaMethod getMethod() {
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69 return method;
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70 }
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71
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72 @Override
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73 public void invalidate() {
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74 runtime().getCompilerToVM().invalidateInstalledCode(this);
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75 }
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76
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77 @Override
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78 public String toString() {
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79 return String.format("InstalledNmethod[method=%s, codeBlob=0x%x, isDefault=%b, name=%s]", method, getAddress(), isDefault, name);
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80 }
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81
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82 protected boolean checkThreeObjectArgs() {
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83 assert method.getSignature().getParameterCount(!method.isStatic()) == 3;
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84 assert method.getSignature().getParameterKind(0) == Kind.Object;
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85 assert method.getSignature().getParameterKind(1) == Kind.Object;
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86 assert !method.isStatic() || method.getSignature().getParameterKind(2) == Kind.Object;
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87 return true;
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88 }
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89
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90 private boolean checkArgs(Object... args) {
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91 JavaType[] sig = method.toParameterTypes();
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92 assert args.length == sig.length : method.format("%H.%n(%p): expected ") + sig.length + " args, got " + args.length;
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93 for (int i = 0; i < sig.length; i++) {
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94 Object arg = args[i];
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95 if (arg == null) {
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96 assert sig[i].getKind() == Kind.Object : method.format("%H.%n(%p): expected arg ") + i + " to be Object, not " + sig[i];
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97 } else if (sig[i].getKind() != Kind.Object) {
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98 assert sig[i].getKind().toBoxedJavaClass() == arg.getClass() : method.format("%H.%n(%p): expected arg ") + i + " to be " + sig[i] + ", not " + arg.getClass();
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99 }
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100 }
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101 return true;
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102 }
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103
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104 @Override
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105 public Object executeVarargs(Object... args) throws InvalidInstalledCodeException {
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106 assert checkArgs(args);
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107 assert !isExternal();
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108 return runtime().getCompilerToVM().executeInstalledCode(args, this);
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109 }
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110
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111 @Override
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112 public long getStart() {
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113 return isValid() ? super.getStart() : 0;
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114 }
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115 }