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

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2000-2001 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.code;
26
27 import java.io.*;
28
29 import sun.jvm.hotspot.utilities.*;
30
31 /** <P> Classes used for serializing debugging information. These
32 abstractions are introducted to provide symmetric read and write
33 operations. </P>
34
35 <P>
36 <UL>
37 <LI> ScopeValue: describes the value of a variable/expression in a scope
38 <UL>
39 <LI> LocationValue: describes a value in a given location (in frame or register)
40 <LI> ConstantValue: describes a constant
41 </UL>
42 </UL>
43 </P> */
44
45 public abstract class ScopeValue {
46 // Package private enumeration values (FIXME: read from target VM)
47 static final int LOCATION_CODE = 0;
48 static final int CONSTANT_INT_CODE = 1;
49 static final int CONSTANT_OOP_CODE = 2;
50 static final int CONSTANT_LONG_CODE = 3;
51 static final int CONSTANT_DOUBLE_CODE = 4;
52
53 public boolean isLocation() { return false; }
54 public boolean isConstantInt() { return false; }
55 public boolean isConstantDouble() { return false; }
56 public boolean isConstantLong() { return false; }
57 public boolean isConstantOop() { return false; }
58
59 public static ScopeValue readFrom(DebugInfoReadStream stream) {
60 switch (stream.readInt()) {
61 case LOCATION_CODE:
62 return new LocationValue(stream);
63 case CONSTANT_INT_CODE:
64 return new ConstantIntValue(stream);
65 case CONSTANT_OOP_CODE:
66 return new ConstantOopReadValue(stream);
67 case CONSTANT_LONG_CODE:
68 return new ConstantLongValue(stream);
69 case CONSTANT_DOUBLE_CODE:
70 return new ConstantDoubleValue(stream);
71 default:
72 Assert.that(false, "should not reach here");
73 return null;
74 }
75 }
76
77 public abstract void printOn(PrintStream tty);
78 }