1 kkz 1.1.2.1 // WriteBarrierData.java, created Thu Aug 30 16:49:28 2001 by kkz
2 kkz 1.1.2.1 // Copyright (C) 2000 Karen Zee <kkz@tmi.lcs.mit.edu>
3 kkz 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 kkz 1.1.2.1 package harpoon.Analysis.PreciseGC;
5 kkz 1.1.2.1
6 kkz 1.1.2.1 import harpoon.Backend.Generic.Frame;
7 kkz 1.1.2.1 import harpoon.ClassFile.HClass;
8 kkz 1.1.2.1 import harpoon.ClassFile.HDataElement;
9 kkz 1.1.2.1 import harpoon.IR.Tree.ALIGN;
10 kkz 1.1.2.1 import harpoon.IR.Tree.CONST;
11 kkz 1.1.2.1 import harpoon.IR.Tree.DATUM;
12 kkz 1.1.2.1 import harpoon.IR.Tree.LABEL;
13 kkz 1.1.2.1 import harpoon.IR.Tree.SEGMENT;
14 kkz 1.1.2.1 import harpoon.IR.Tree.Stm;
15 kkz 1.1.2.1 import harpoon.Temp.Label;
16 kkz 1.1.2.1 import harpoon.Util.Util;
17 kkz 1.1.2.1
18 kkz 1.1.2.1 import java.util.ArrayList;
19 kkz 1.1.2.1 import java.util.List;
20 kkz 1.1.2.1
21 kkz 1.1.2.1 /**
22 kkz 1.1.2.1 * <code>WriteBarrierData</code> generates the static data needed
23 kkz 1.1.2.1 * to gather dynamic statistics about write barriers. Should
24 kkz 1.1.2.1 * be used in conjunction with <code>WriteBarrierStats</code>.
25 kkz 1.1.2.1 *
26 kkz 1.1.2.1 * @author Karen Zee <kkz@tmi.lcs.mit.edu>
27 kkz 1.5 * @version $Id: WriteBarrierData.java,v 1.5 2002/06/25 18:16:22 kkz Exp $
28 kkz 1.1.2.1 */
29 kkz 1.5 class WriteBarrierData extends harpoon.Backend.Runtime1.Data {
30 kkz 1.1.2.1
31 kkz 1.1.2.1 /** Creates a <code>WriteBarrierData</code> */
32 kkz 1.1.2.1 WriteBarrierData(HClass hc, Frame f, int datum) {
33 kkz 1.1.2.1 super("write-barrier", hc, f);
34 kkz 1.1.2.1 // only emit this once
35 cananian 1.3.2.1 assert hc == f.getLinker().forName("java.lang.Object");
36 kkz 1.1.2.1 this.root = build(datum);
37 kkz 1.1.2.1 }
38 kkz 1.1.2.1
39 kkz 1.1.2.1 private HDataElement build(int datum) {
40 kkz 1.1.2.1 List stmlist = new ArrayList(4);
41 kkz 1.1.2.1 stmlist.add(new SEGMENT(tf, null, SEGMENT.TEXT));
42 kkz 1.1.2.1 stmlist.add(new ALIGN(tf, null, 4)); // word align
43 kkz 1.1.2.1 stmlist.add(new LABEL(tf, null,new Label("num_write_barriers"), true));
44 kkz 1.1.2.1 stmlist.add(new DATUM(tf, null, new CONST(tf, null, datum)));
45 kkz 1.1.2.1 return (HDataElement) Stm.toStm(stmlist);
46 kkz 1.1.2.1 }
47 cananian 1.2 }