1 salcianu 1.1.2.1 // CachingBBConverter.java, created Wed Mar 8 15:57:12 2000 by salcianu
2 cananian 1.1.2.2 // Copyright (C) 2000 Alexandru SALCIANU <salcianu@retezat.lcs.mit.edu>
3 salcianu 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 salcianu 1.1.2.1 package harpoon.Util.BasicBlocks;
5 salcianu 1.1.2.1
6 salcianu 1.1.2.1 import java.util.Map;
7 salcianu 1.1.2.1 import java.util.HashMap;
8 salcianu 1.1.2.1
9 salcianu 1.1.2.1 import harpoon.ClassFile.HMethod;
10 salcianu 1.1.2.1 import harpoon.ClassFile.HCodeFactory;
11 salcianu 1.1.2.3 import harpoon.Analysis.BasicBlock;
12 salcianu 1.1.2.3 import harpoon.Analysis.BasicBlockFactoryInterf;
13 salcianu 1.1.2.1
14 salcianu 1.1.2.1 /**
15 salcianu 1.1.2.1 * <code>CachingBBConverter</code> provides some caching for the
16 salcianu 1.1.2.1 * <code>BBConverter</code>. This is THE class to use if you need to obtain
17 salcianu 1.1.2.1 * the <code>BasicBlock</code> view of the same method multiple times and
18 salcianu 1.1.2.1 * don't want to litter all your code with caching mechanisms.
19 salcianu 1.1.2.1 *
20 cananian 1.1.2.2 * @author Alexandru SALCIANU <salcianu@retezat.lcs.mit.edu>
21 cananian 1.2 * @version $Id: CachingBBConverter.java,v 1.2 2002/02/25 21:08:59 cananian Exp $
22 salcianu 1.1.2.1 */
23 salcianu 1.1.2.1 public class CachingBBConverter extends BBConverter{
24 salcianu 1.1.2.1
25 salcianu 1.1.2.1 Map cache;
26 salcianu 1.1.2.1
27 salcianu 1.1.2.1 /** Creates a <code>CachingBBConverter</code>. */
28 salcianu 1.1.2.1 public CachingBBConverter(HCodeFactory hcf){
29 salcianu 1.1.2.1 super(hcf);
30 salcianu 1.1.2.1 cache = new HashMap();
31 salcianu 1.1.2.1 }
32 salcianu 1.1.2.1
33 salcianu 1.1.2.1 /** Converts the code of the method <code>hm</code> to
34 salcianu 1.1.2.1 <code>BasicBlock.Factory</code>, a basic block view of
35 salcianu 1.1.2.1 <code>hm</code>'s code. The code of the method is obtained from
36 salcianu 1.1.2.1 the <code>HCodeFactory</code> that was passed to the constructor of
37 salcianu 1.1.2.1 <code>this</code>.<br>
38 salcianu 1.1.2.1 <b>Note</b>: the results are cached. */
39 salcianu 1.1.2.3 public BasicBlockFactoryInterf convert2bb(HMethod hm){
40 salcianu 1.1.2.3 BasicBlockFactoryInterf bb = (BasicBlockFactoryInterf) cache.get(hm);
41 salcianu 1.1.2.1 if(bb == null){
42 salcianu 1.1.2.1 bb = super.convert2bb(hm);
43 salcianu 1.1.2.1 cache.put(hm,bb);
44 salcianu 1.1.2.1 }
45 salcianu 1.1.2.1 return bb;
46 salcianu 1.1.2.1 }
47 salcianu 1.1.2.1
48 salcianu 1.1.2.1 /** Remove from the internal cache the result for <code>hm</code>.
49 salcianu 1.1.2.1 This is useful if <code>hm</code> was modified and a new
50 salcianu 1.1.2.1 <code>BasicBlock</code> view needs to be generated for it. */
51 salcianu 1.1.2.1 public void clear(HMethod hm){
52 salcianu 1.1.2.1 cache.remove(hm);
53 salcianu 1.1.2.1 }
54 salcianu 1.1.2.1
55 salcianu 1.1.2.1 /** Completely clears the internal cache. */
56 salcianu 1.1.2.1 public void clear(){
57 salcianu 1.1.2.1 cache.clear();
58 salcianu 1.1.2.1 }
59 cananian 1.2 }