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.
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20  * or visit www.oracle.com if you need additional information or have any
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23  */
24 
25 package sun.jvm.hotspot.interpreter;
26 
27 import java.io.*;
28 import java.util.*;
29 
30 import sun.jvm.hotspot.code.*;
31 import sun.jvm.hotspot.debugger.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34 import 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 
40 public 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 {
VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } })47     VM.registerVMInitializedObserver(new Observer() {
48         public void update(Observable o, Object data) {
49           initialize(VM.getVM().getTypeDataBase());
50         }
51       });
52   }
53 
initialize(TypeDataBase db)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 
InterpreterCodelet(Address addr)64   public InterpreterCodelet(Address addr) {
65     super(addr);
66   }
67 
getSize()68   public long getSize() {
69     return sizeField.getValue(addr);
70   }
71 
codeBegin()72   public Address codeBegin() {
73     return addr.addOffsetTo(instanceSize);
74   }
75 
codeEnd()76   public Address codeEnd() {
77     return addr.addOffsetTo(getSize());
78   }
79 
codeSize()80   public long codeSize() {
81     return codeEnd().minus(codeBegin());
82   }
83 
getDescription()84   public String getDescription() {
85     return CStringUtilities.getString(descriptionField.getValue(addr));
86   }
87 
verify()88   public void verify() {
89   }
90 
printOn(PrintStream tty)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