Mercurial > hg > truffle

comparison graal/GraalCompiler/src/com/sun/c1x/ir/LoopBegin.java @ 2799:e1dad0edd57a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
first part of loop reworking
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 27 May 2011 17:48:28 +0200
parents
children bd17ac598c6e
comparison
equal deleted inserted replaced
2798:58e65eb6bb5d 2799:e1dad0edd57a
1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.c1x.ir;
24
25 import com.oracle.graal.graph.*;
26 import com.sun.c1x.debug.*;
27
28 public class LoopBegin extends Merge {
29
30 private static final int INPUT_COUNT = 0;
31 private static final int SUCCESSOR_COUNT = 0;
32
33 public LoopBegin(Graph graph) {
34 super(INPUT_COUNT, SUCCESSOR_COUNT, graph);
35 }
36
37 public LoopEnd loopEnd() {
38 for (Node usage : usages()) {
39 if (usage instanceof LoopEnd) {
40 LoopEnd end = (LoopEnd) usage;
41 if (end.loopBegin() == this) {
42 return end;
43 }
44 }
45 }
46 assert false : "Begin should always have a LoopEnd";
47 return null;
48 }
49
50 @Override
51 public void accept(ValueVisitor v) {
52 v.visitLoopBegin(this);
53 }
54
55 @Override
56 public void print(LogStream out) {
57 out.print("loopBegin");
58 }
59
60 }