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1 /*
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2 * Copyright 2000-2004 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.interpreter;
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26
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27 import java.io.*;
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28 import java.util.*;
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29
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30 import sun.jvm.hotspot.code.*;
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31 import sun.jvm.hotspot.debugger.*;
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32 import sun.jvm.hotspot.runtime.*;
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33 import sun.jvm.hotspot.types.*;
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34 import sun.jvm.hotspot.utilities.*;
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35
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36 /** An InterpreterCodelet is a piece of interpreter code. All
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37 interpreter code is generated into little codelets which contain
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38 extra information for debugging and printing purposes. */
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39
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40 public class InterpreterCodelet extends Stub {
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41 private static long instanceSize;
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42 private static CIntegerField sizeField; // the size in bytes
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43 private static AddressField descriptionField; // a description of the codelet, for debugging & printing
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44 private static CIntegerField bytecodeField; // associated bytecode if any
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45
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46 static {
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47 VM.registerVMInitializedObserver(new Observer() {
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48 public void update(Observable o, Object data) {
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49 initialize(VM.getVM().getTypeDataBase());
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50 }
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51 });
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52 }
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53
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54 private static synchronized void initialize(TypeDataBase db) {
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55 Type type = db.lookupType("InterpreterCodelet");
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56
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57 sizeField = type.getCIntegerField("_size");
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58 descriptionField = type.getAddressField("_description");
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59 bytecodeField = type.getCIntegerField("_bytecode");
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60
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61 instanceSize = type.getSize();
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62 }
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63
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64 public InterpreterCodelet(Address addr) {
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65 super(addr);
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66 }
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67
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68 public long getSize() {
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69 return sizeField.getValue(addr);
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70 }
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71
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72 public Address codeBegin() {
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73 return addr.addOffsetTo(instanceSize);
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74 }
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75
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76 public Address codeEnd() {
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77 return addr.addOffsetTo(getSize());
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78 }
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79
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80 public long codeSize() {
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81 return codeEnd().minus(codeBegin());
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82 }
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83
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84 public String getDescription() {
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85 return CStringUtilities.getString(descriptionField.getValue(addr));
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86 }
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87
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88 public void verify() {
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89 }
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90
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91 public void printOn(PrintStream tty) {
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92 String desc = getDescription();
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93 if (desc != null) {
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94 tty.print(desc);
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95 }
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96 // FIXME: add printing of bytecode
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97 tty.println(" [" + codeBegin() + ", " + codeEnd() + ") " +
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98 codeSize() + " bytes ");
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99 // FIXME: add disassembly
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100 }
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101 }
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