InterpreterCodelet.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2000, 2004, 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 */
24
25package sun.jvm.hotspot.interpreter;
26
27import java.io.*;
28import java.util.*;
29
30import sun.jvm.hotspot.code.*;
31import sun.jvm.hotspot.debugger.*;
32import sun.jvm.hotspot.runtime.*;
33import sun.jvm.hotspot.types.*;
34import sun.jvm.hotspot.utilities.*;
35
36/** An InterpreterCodelet is a piece of interpreter code. All
37    interpreter code is generated into little codelets which contain
38    extra information for debugging and printing purposes. */
39
40public class InterpreterCodelet extends Stub {
41  private static long          instanceSize;
42  private static CIntegerField sizeField;             // the size in bytes
43  private static AddressField  descriptionField;      // a description of the codelet, for debugging & printing
44  private static CIntegerField bytecodeField;         // associated bytecode if any
45
46  static {
47    VM.registerVMInitializedObserver(new Observer() {
48        public void update(Observable o, Object data) {
49          initialize(VM.getVM().getTypeDataBase());
50        }
51      });
52  }
53
54  private static synchronized void initialize(TypeDataBase db) {
55    Type type = db.lookupType("InterpreterCodelet");
56
57    sizeField            = type.getCIntegerField("_size");
58    descriptionField     = type.getAddressField("_description");
59    bytecodeField        = type.getCIntegerField("_bytecode");
60
61    instanceSize = type.getSize();
62  }
63
64  public InterpreterCodelet(Address addr) {
65    super(addr);
66  }
67
68  public long getSize() {
69    return sizeField.getValue(addr);
70  }
71
72  public Address codeBegin() {
73    return addr.addOffsetTo(instanceSize);
74  }
75
76  public Address codeEnd() {
77    return addr.addOffsetTo(getSize());
78  }
79
80  public long codeSize() {
81    return codeEnd().minus(codeBegin());
82  }
83
84  public String getDescription() {
85    return CStringUtilities.getString(descriptionField.getValue(addr));
86  }
87
88  public void verify() {
89  }
90
91  public void printOn(PrintStream tty) {
92    String desc = getDescription();
93    if (desc != null) {
94      tty.print(desc);
95    }
96    // FIXME: add printing of bytecode
97    tty.println(" [" + codeBegin() + ", " + codeEnd() + ")  " +
98                codeSize() + " bytes  ");
99    // FIXME: add disassembly
100  }
101}
102