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