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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/Arguments.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2004-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.runtime;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 /** This class represent VM's Arguments class -- command line args, flags etc.*/
35 public class Arguments {
36 static {
37 VM.registerVMInitializedObserver(new Observer() {
38 public void update(Observable o, Object data) {
39 initialize(VM.getVM().getTypeDataBase());
40 }
41 });
42 }
43
44 public static String getJVMFlags() {
45 return buildString(jvmFlagsField, jvmFlagsCount);
46 }
47
48 public static String getJVMArgs() {
49 return buildString(jvmArgsField, jvmArgsCount);
50 }
51
52 public static String getJavaCommand() {
53 return getString(javaCommandField);
54 }
55
56 // Internals only below this point
57
58 // Fields
59 private static AddressField jvmFlagsField;
60 private static AddressField jvmArgsField;
61 private static AddressField javaCommandField;
62 private static long jvmFlagsCount;
63 private static long jvmArgsCount;
64
65 private static synchronized void initialize(TypeDataBase db) {
66 Type argumentsType = db.lookupType("Arguments");
67 jvmFlagsField = argumentsType.getAddressField("_jvm_flags_array");
68 jvmArgsField = argumentsType.getAddressField("_jvm_args_array");
69 javaCommandField = argumentsType.getAddressField("_java_command");
70
71 jvmArgsCount = argumentsType.getCIntegerField("_num_jvm_args").getValue();
72 jvmFlagsCount = argumentsType.getCIntegerField("_num_jvm_flags").getValue();
73 }
74
75 private static String buildString(AddressField arrayField, long count) {
76 StringBuilder sb = new StringBuilder();
77 if (count > 0) {
78 sb.append(getStringAt(arrayField, 0));
79 for (long i = 1; i < count; i++) {
80 sb.append(" ");
81 sb.append(getStringAt(arrayField, i));
82 }
83 }
84 return sb.toString();
85 }
86
87 private static String getString(AddressField field) {
88 Address addr = field.getAddress();
89 return CStringUtilities.getString(addr);
90 }
91
92 private static String getStringAt(AddressField field, long index) {
93 Address addr = field.getAddress();
94 return CStringUtilities.getString(addr.getAddressAt(index * VM.getVM().getAddressSize()));
95 }
96 }