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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Switch.java @ 2657:4a6518c4d17d

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Removed need for base instruction. Cleanup.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 11 May 2011 16:10:49 +0200
parents 0c6564c254af
children a0dd2b907806
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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.oracle.graal.graph.*;
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28 import com.sun.c1x.value.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * The {@code Switch} class is the base of both lookup and table switches.
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33 */
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34 public abstract class Switch extends BlockEnd {
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35
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36 private static final int INPUT_COUNT = 1;
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37 private static final int INPUT_VALUE = 0;
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38
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39 private static final int SUCCESSOR_COUNT = 0;
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40
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41 @Override
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42 protected int inputCount() {
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43 return super.inputCount() + INPUT_COUNT;
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44 }
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45
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46 @Override
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47 protected int successorCount() {
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48 return super.successorCount() + SUCCESSOR_COUNT;
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49 }
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50
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51 /**
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52 * The instruction that provides the input value to this switch.
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53 */
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54 public Value value() {
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55 return (Value) inputs().get(super.inputCount() + INPUT_VALUE);
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56 }
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57
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58 public Value setValue(Value n) {
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59 return (Value) inputs().set(super.inputCount() + INPUT_VALUE, n);
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60 }
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61
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62 /**
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63 * Constructs a new Switch.
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64 * @param value the instruction that provides the value to be switched over
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65 * @param successors the list of successors of this switch
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66 * @param stateBefore the state before the switch
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67 * @param isSafepoint {@code true} if this switch is a safepoint
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68 * @param graph
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69 */
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70 public Switch(Value value, List<BlockBegin> successors, FrameState stateBefore, boolean isSafepoint, int inputCount, int successorCount, Graph graph) {
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71 super(CiKind.Illegal, stateBefore, isSafepoint, successors, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
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72 setValue(value);
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73 }
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74
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75 /**
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76 * Gets the number of cases that this switch covers (excluding the default case).
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77 * @return the number of cases
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78 */
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79 public int numberOfCases() {
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80 return blockSuccessorCount() - 1;
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81 }
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82
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83 }