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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/VMField.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 1439a6614a10
children
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1 /*
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2 * Copyright (c) 2016, 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 /**
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26 * Describes a C++ field exposed via {@link HotSpotVMConfigAccess}.
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27 */
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28 public final class VMField {
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29
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30 /**
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31 * Fully qualified name of the represented field (e.g., "Klass::_name").
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32 */
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33 public final String name;
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34
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35 /**
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36 * The represented field's type (e.g., "Symbol*"). This may be {@code null}.
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37 */
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38 public final String type;
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39
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40 /**
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41 * If the represented field is non-static, this is its offset within the containing structure.
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42 */
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43 public final long offset;
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44
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45 /**
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46 * If the represented field is static, this is its address. Otherwise, this is 0.
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47 */
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48 public final long address;
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49
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50 /**
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51 * Value of the field represented as a boxed boolean if its C++ type is bool otherwise as a
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52 * boxed long; only valid for non-oop static fields. This value is only captured once, during
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53 * JVMCI initialization. If {@link #type} cannot be meaningfully (e.g., a struct) or safely
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54 * (e.g., an oop) expressed as a boxed object, this is {@code null}.
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55 */
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56 public final Object value;
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57
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58 /**
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59 * Determines if the represented field is static.
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60 */
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61 public boolean isStatic() {
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62 return address != 0;
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63 }
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64
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65 /**
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66 * Creates a description of a non-static field.
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67 */
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68 public VMField(String name, String type, long offset) {
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69 this.name = name;
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70 this.type = type;
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71 this.offset = offset;
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72 this.address = 0;
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73 this.value = null;
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74 }
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75
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76 /**
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77 * Creates a description of a static field.
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78 */
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79 public VMField(String name, String type, long address, Long value) {
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80 this.name = name;
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81 this.type = type;
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82 this.offset = 0;
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83 this.address = address;
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84 this.value = value;
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85 }
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86
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87 @Override
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88 public String toString() {
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89 String val = value == null ? "null" : String.format("0x%x", value);
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90 return String.format("Field[name=%s, type=%s, offset=%d, address=0x%x, value=%s]", name, type, offset, address, val);
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91 }
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92 }