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annotate graal/Compiler/src/com/sun/c1x/ir/Switch.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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2507
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1 /*
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2 * Copyright (c) 2009, 2010, 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 java.util.*;
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26
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27 import com.sun.c1x.value.*;
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28 import com.sun.cri.ci.*;
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29
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30 /**
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31 * The {@code Switch} class is the base of both lookup and table switches.
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32 *
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33 * @author Ben L. Titzer
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34 */
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35 public abstract class Switch extends BlockEnd {
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36
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37 Value value;
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38
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39 /**
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40 * Constructs a new Switch.
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41 * @param value the instruction that provides the value to be switched over
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42 * @param successors the list of successors of this switch
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43 * @param stateBefore the state before the switch
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44 * @param isSafepoint {@code true} if this switch is a safepoint
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45 */
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46 public Switch(Value value, List<BlockBegin> successors, FrameState stateBefore, boolean isSafepoint) {
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47 super(CiKind.Illegal, stateBefore, isSafepoint, successors);
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48 this.value = value;
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49 }
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50
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51 /**
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52 * Gets the instruction that provides the input value to this switch.
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53 * @return the instruction producing the input value
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54 */
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55 public Value value() {
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56 return value;
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57 }
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58
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59 /**
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60 * Gets the number of cases that this switch covers (excluding the default case).
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61 * @return the number of cases
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62 */
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63 public int numberOfCases() {
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64 return successors.size() - 1;
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65 }
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66
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67 /**
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68 * Iterates over the inputs to this instruction.
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69 * @param closure the closure to apply
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70 */
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71 @Override
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72 public void inputValuesDo(ValueClosure closure) {
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73 value = closure.apply(value);
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74 }
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75 }