1 cananian 1.1.2.1 // Ref.java, created Mon Dec 28 00:29:30 1998 by cananian
2 cananian 1.1.2.2 // Copyright (C) 1998 C. Scott Ananian <cananian@alumni.princeton.edu>
3 cananian 1.1.2.2 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 cananian 1.1.2.1 package harpoon.Interpret.Quads;
5 cananian 1.1.2.1
6 cananian 1.1.2.1 import harpoon.ClassFile.HClass;
7 cananian 1.1.2.1 import harpoon.ClassFile.HField;
8 cananian 1.1.2.1 import harpoon.ClassFile.HMethod;
9 cananian 1.1.2.1 import harpoon.Util.Util;
10 cananian 1.1.2.1
11 cananian 1.1.2.1 /**
12 cananian 1.1.2.1 * <code>Ref</code> is an abstract superclass for object and array references.
13 cananian 1.1.2.1 *
14 cananian 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
15 cananian 1.3 * @version $Id: Ref.java,v 1.3 2002/04/10 03:05:50 cananian Exp $
16 cananian 1.1.2.1 */
17 cananian 1.1.2.3 abstract class Ref implements Cloneable, java.io.Serializable {
18 cananian 1.1.2.1 /** The type of the object. */
19 cananian 1.1.2.1 final HClass type;
20 cananian 1.1.2.1 /** A pointer to the static state, so we can finalize. */
21 cananian 1.1.2.1 final StaticState ss;
22 cananian 1.1.2.1 /** A monitor lock. */
23 cananian 1.1.2.1 //boolean lock;
24 cananian 1.1.2.1 /** Profiling information. */
25 cananian 1.2.2.1 final long creation_time;
26 cananian 1.1.2.1
27 cananian 1.1.2.1 /** create a new ref.
28 cananian 1.1.2.1 * @exception InterpretedThrowable
29 cananian 1.1.2.1 * if class initializer throws an exception. */
30 cananian 1.1.2.1 Ref(StaticState ss, HClass type) {
31 cananian 1.1.2.1 this.ss = ss; this.type = type;
32 cananian 1.1.2.1 /*this.lock = false;*/
33 cananian 1.1.2.1 // load class into StaticState, if needed.
34 cananian 1.1.2.1 if (!ss.isLoaded(type)) ss.load(type);
35 cananian 1.1.2.1 this.creation_time = ss.getInstructionCount();
36 cananian 1.1.2.1 // yay, done.
37 cananian 1.1.2.1 }
38 cananian 1.1.2.1
39 cananian 1.1.2.1 synchronized void lock() { /* FIXME */ }
40 cananian 1.1.2.1 synchronized void unlock() { /* FIXME */ }
41 cananian 1.1.2.1
42 cananian 1.1.2.1 // arrays have a single final field.
43 cananian 1.1.2.1 abstract Object get(HField f);
44 cananian 1.1.2.1
45 cananian 1.1.2.1 public abstract Object clone();
46 cananian 1.1.2.1
47 cananian 1.1.2.4 // for profiling only
48 cananian 1.1.2.4 protected abstract int size();
49 cananian 1.1.2.4
50 cananian 1.1.2.1 protected void finalize() throws Throwable {
51 cananian 1.1.2.1 // profile
52 cananian 1.1.2.4 ss.profile(this.type, this.creation_time, ss.getInstructionCount(),
53 cananian 1.1.2.4 this.size());
54 cananian 1.1.2.1 // finalize the actual object.
55 cananian 1.1.2.1 super.finalize();
56 cananian 1.1.2.1 }
57 cananian 1.1.2.1
58 cananian 1.1.2.1 // UTILITY:
59 cananian 1.1.2.1 static final Object defaultValue(HField f) {
60 cananian 1.1.2.1 if (f.isConstant()) return f.getConstant();
61 cananian 1.1.2.1 return defaultValue(f.getType());
62 cananian 1.1.2.1 }
63 cananian 1.1.2.1 static final Object defaultValue(HClass ty) {
64 cananian 1.1.2.1 if (!ty.isPrimitive()) return null;
65 cananian 1.1.2.1 if (ty == HClass.Boolean) return new Boolean(false);
66 cananian 1.1.2.1 if (ty == HClass.Byte) return new Byte((byte)0);
67 cananian 1.1.2.1 if (ty == HClass.Char) return new Character((char)0);
68 cananian 1.1.2.1 if (ty == HClass.Double) return new Double(0);
69 cananian 1.1.2.1 if (ty == HClass.Float) return new Float(0);
70 cananian 1.1.2.1 if (ty == HClass.Int) return new Integer(0);
71 cananian 1.1.2.1 if (ty == HClass.Long) return new Long(0);
72 cananian 1.1.2.1 if (ty == HClass.Short) return new Short((short)0);
73 cananian 1.1.2.1 throw new Error("Ack! What kinda default value is this?!");
74 cananian 1.1.2.1 }
75 cananian 1.2 }