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annotate graal/Compiler/src/com/sun/c1x/ir/StateSplit.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, 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.sun.c1x.value.*;
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26 import com.sun.cri.ci.*;
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27
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28 /**
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29 * The {@code StateSplit} class is the abstract base class of all instructions
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30 * that store an immutable copy of the frame state.
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31 *
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32 * @author Ben L. Titzer
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33 */
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34 public abstract class StateSplit extends Instruction {
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35
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36 /**
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37 * Sentinel denoting an explicitly cleared state.
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38 */
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39 private static final FrameState CLEARED_STATE = new MutableFrameState(null, -5, 0, 0);
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40
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41 private FrameState stateBefore;
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42
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43 /**
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44 * Creates a new state split with the specified value type.
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45 * @param kind the type of the value that this instruction produces
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46 */
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47 public StateSplit(CiKind kind, FrameState stateBefore) {
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48 super(kind);
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49 this.stateBefore = stateBefore;
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50 }
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51
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52 /**
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53 * Determines if the state for this instruction has explicitly
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54 * been cleared (as opposed to never initialized). Once explicitly
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55 * cleared, an instruction must not have it state (re)set.
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56 */
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57 public boolean isStateCleared() {
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58 return stateBefore == CLEARED_STATE;
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59 }
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60
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61 /**
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62 * Clears the state for this instruction. Once explicitly
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63 * cleared, an instruction must not have it state (re)set.
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64 */
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65 protected void clearState() {
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66 stateBefore = CLEARED_STATE;
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67 }
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68
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69 /**
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70 * Records the state of this instruction before it is executed.
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71 *
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72 * @param stateBefore the state
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73 */
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74 public final void setStateBefore(FrameState stateBefore) {
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75 assert this.stateBefore == null;
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76 this.stateBefore = stateBefore;
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77 }
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78
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79 /**
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80 * Gets the state for this instruction.
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81 * @return the state
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82 */
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83 @Override
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84 public final FrameState stateBefore() {
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85 return stateBefore == CLEARED_STATE ? null : stateBefore;
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86 }
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87 }