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

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first part of loop reworking
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 27 May 2011 17:48:28 +0200
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children bd17ac598c6e
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2799
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.ir;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27
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28 public class LoopBegin extends Merge {
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29
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30 private static final int INPUT_COUNT = 0;
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31 private static final int SUCCESSOR_COUNT = 0;
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32
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33 public LoopBegin(Graph graph) {
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34 super(INPUT_COUNT, SUCCESSOR_COUNT, graph);
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35 }
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36
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37 public LoopEnd loopEnd() {
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38 for (Node usage : usages()) {
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39 if (usage instanceof LoopEnd) {
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40 LoopEnd end = (LoopEnd) usage;
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41 if (end.loopBegin() == this) {
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42 return end;
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43 }
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44 }
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45 }
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46 assert false : "Begin should always have a LoopEnd";
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47 return null;
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48 }
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49
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50 @Override
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51 public void accept(ValueVisitor v) {
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52 v.visitLoopBegin(this);
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53 }
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54
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55 @Override
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56 public void print(LogStream out) {
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57 out.print("loopBegin");
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58 }
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59
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60 }