1 cananian 1.1.2.1 // ArrayCopyImplementer.java, created Tue Jan 23 16:26:48 2001 by cananian
2 cananian 1.1.2.1 // Copyright (C) 2000 C. Scott Ananian <cananian@alumni.princeton.edu>
3 cananian 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 cananian 1.1.2.1 package harpoon.Analysis.Transactions;
5 cananian 1.1.2.1
6 cananian 1.1.2.2 import harpoon.ClassFile.CachingCodeFactory;
7 cananian 1.1.2.2 import harpoon.ClassFile.HClass;
8 cananian 1.1.2.2 import harpoon.ClassFile.HCode;
9 cananian 1.1.2.2 import harpoon.ClassFile.HCodeAndMaps;
10 cananian 1.1.2.2 import harpoon.ClassFile.HCodeFactory;
11 cananian 1.1.2.2 import harpoon.ClassFile.HMethod;
12 cananian 1.1.2.2 import harpoon.ClassFile.HMethodMutator;
13 cananian 1.1.2.2 import harpoon.ClassFile.Linker;
14 cananian 1.1.2.2 import harpoon.Util.Util;
15 cananian 1.1.2.1
16 cananian 1.1.2.2 import java.lang.reflect.Modifier;
17 cananian 1.1.2.1 /**
18 cananian 1.1.2.1 * <code>ArrayCopyImplementer</code> adds a pure-java implementation of
19 cananian 1.1.2.1 * the <code>System.arraycopy()</code> method. Our implementation is
20 cananian 1.1.2.1 * defined in <code>harpoon.Runtime.ArrayCopy</code>.
21 cananian 1.1.2.1 * <p>
22 cananian 1.1.2.1 * Arguably, this class should belong in the
23 cananian 1.1.2.1 * <code>harpoon.Analysis.Quads</code> package, but we'll leave it
24 cananian 1.1.2.1 * here until someone other than the Transactions transformation
25 cananian 1.1.2.1 * needs it.
26 cananian 1.1.2.1 * <p>
27 cananian 1.1.2.1 * When we implement better array bounds check elimination in loops,
28 cananian 1.1.2.1 * the version implemented here should have performance equivalent
29 cananian 1.1.2.1 * (or better than) the native version. Better, we should be able
30 cananian 1.1.2.1 * to inline this version and eliminate lots of checks in most cases.
31 cananian 1.1.2.1 *
32 cananian 1.1.2.1 * @author C. Scott Ananian <cananian@alumni.princeton.edu>
33 cananian 1.5 * @version $Id: ArrayCopyImplementer.java,v 1.5 2003/10/03 19:46:33 cananian Exp $
34 cananian 1.1.2.1 */
35 cananian 1.1.2.1 public class ArrayCopyImplementer extends CachingCodeFactory {
36 cananian 1.1.2.1 /** Parent code factory. */
37 cananian 1.5 final HMethod HMimpac;
38 cananian 1.1.2.1
39 cananian 1.1.2.1 /** Creates a <code>ArrayCopyImplementer</code>. */
40 cananian 1.1.2.1 public ArrayCopyImplementer(HCodeFactory parent, Linker l) {
41 cananian 1.1.2.1 super(parent);
42 cananian 1.1.2.1 this.HMimpac = l.forName("harpoon.Runtime.ArrayCopy").getMethod
43 cananian 1.1.2.1 ("arraycopy", "(Ljava/lang/Object;ILjava/lang/Object;II)V");
44 cananian 1.1.2.1 }
45 cananian 1.1.2.1 public HCode convert(HMethod m) {
46 cananian 1.5 if (m.getName().equals("arraycopy") &&
47 cananian 1.5 m.getDescriptor().equals
48 cananian 1.5 ("(Ljava/lang/Object;ILjava/lang/Object;II)V") &&
49 cananian 1.5 (m.getDeclaringClass().getName().equals("java.lang.System") ||
50 cananian 1.5 m.getDeclaringClass().getName().equals("java.lang.VMSystem")))
51 cananian 1.1.2.1 try {
52 cananian 1.5 // ensure method is non-native.
53 cananian 1.5 m.getMutator().removeModifiers(Modifier.NATIVE);
54 cananian 1.1.2.1 // copy implementation from harpoon.Runtime.ArrayCopy.
55 cananian 1.5 return super.convert(HMimpac).clone(m).hcode();
56 cananian 1.1.2.1 } catch (CloneNotSupportedException e) {
57 cananian 1.3.2.1 assert false : e; // shouldn't happen.
58 cananian 1.1.2.1 }
59 cananian 1.1.2.1 return super.convert(m);
60 cananian 1.1.2.1 }
61 cananian 1.2 }