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comparison jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/VMField.java @ 23679:b5557b757040

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fix HotSpotVMConfig startup performance (JDK-8159167)
author Doug Simon <doug.simon@oracle.com>
date Wed, 15 Jun 2016 00:00:41 +0200
parents
children 1439a6614a10
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23678:e86a0b0ba969 23679:b5557b757040
1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package jdk.vm.ci.hotspot;
24
25 /**
26 * Describes a C++ field exposed via {@link HotSpotVMConfigAccess}.
27 */
28 public final class VMField {
29
30 /**
31 * Fully qualified name of the represented field (e.g., "Klass::_name").
32 */
33 public final String name;
34
35 /**
36 * The represented field's type (e.g., "Symbol*"). This may be {@code null}.
37 */
38 public final String type;
39
40 /**
41 * If represented field is non-static, this is its offset within the containing structure.
42 */
43 public final long offset;
44
45 /**
46 * If represented field is static, this is its address. Otherwise, this field is 0.
47 */
48 public final long address;
49
50 /**
51 * Value of the field represented as a boxed long; only valid for non-oop static fields. This
52 * value is only captured once, during JVMCI initialization. If {@link #type} cannot be
53 * meaningfully (e.g., a struct) or safely (e.g., an oop) expressed as a boxed long, this is
54 * {@code null}.
55 */
56 public final Long value;
57
58 /**
59 * Determines if the represented field is static.
60 */
61 public boolean isStatic() {
62 return address != 0;
63 }
64
65 /**
66 * Creates a description of a non-static field.
67 */
68 public VMField(String name, String type, long offset) {
69 this.name = name;
70 this.type = type;
71 this.offset = offset;
72 this.address = 0;
73 this.value = null;
74 }
75
76 /**
77 * Creates a description of a static field.
78 */
79 public VMField(String name, String type, long address, Long value) {
80 this.name = name;
81 this.type = type;
82 this.offset = 0;
83 this.address = address;
84 this.value = value;
85 }
86
87 @Override
88 public String toString() {
89 String val = value == null ? "null" : String.format("0x%x", value);
90 return String.format("Field[name=%s, type=%s, offset=%d, address=0x%x, value=%s]", name, type, offset, address, val);
91 }
92 }