Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/VMField.java @ 23777:6c8eaf47db9a
added -XX:+JVMCIPrintFlags to support printing of JVMCI flags without having to know how to trigger JVMCI initialization
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 04 Oct 2016 22:14:32 +0200 |
parents | b5557b757040 |
children | 1439a6614a10 |
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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 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 represented field is static, this is its address. Otherwise, this field 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 long; only valid for non-oop static fields. This |
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52 * value is only captured once, during JVMCI initialization. If {@link #type} cannot be |
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53 * meaningfully (e.g., a struct) or safely (e.g., an oop) expressed as a boxed long, this is |
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54 * {@code null}. |
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55 */ |
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56 public final Long 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 } |