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annotate graal/GraalCompiler/src/com/sun/c1x/ir/StateSplit.java @ 2600:f1bc67c2d453

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new node layout: TypeCheck, RegisterFinalizer, Invoke, NewArray, NullCheck
author Lukas Stadler <lukas.stadler@jku.at>
date Thu, 05 May 2011 16:32:20 +0200
parents 092e628ddd5d
children 39aa89baa165
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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.oracle.graal.graph.*;
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26 import com.sun.c1x.value.*;
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27 import com.sun.cri.ci.*;
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28
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29 /**
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30 * The {@code StateSplit} class is the abstract base class of all instructions
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31 * that store an immutable copy of the frame state.
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32 */
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33 public abstract class StateSplit extends Instruction {
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35 private static final int INPUT_COUNT = 0;
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36 private static final int SUCCESSOR_COUNT = 0;
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37
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38 /**
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39 * Sentinel denoting an explicitly cleared state.
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40 */
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41 private static final FrameState CLEARED_STATE = new MutableFrameState(-5, 0, 0);
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42
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43 private FrameState stateBefore;
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44
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45 /**
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46 * Creates a new state split with the specified value type.
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47 * @param kind the type of the value that this instruction produces
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48 * @param inputCount
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49 * @param successorCount
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50 * @param graph
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51 */
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52 public StateSplit(CiKind kind, FrameState stateBefore, int inputCount, int successorCount, Graph graph) {
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53 super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
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54 this.stateBefore = stateBefore;
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55 }
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56
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57 @Override
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58 public boolean canTrap() {
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59 return stateBefore != null;
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60 }
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61
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62 /**
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63 * Records the state of this instruction before it is executed.
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64 *
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65 * @param stateBefore the state
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66 */
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67 public final void setStateBefore(FrameState stateBefore) {
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68 assert this.stateBefore == null;
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69 this.stateBefore = stateBefore;
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70 }
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71
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72 /**
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73 * Gets the state for this instruction.
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74 * @return the state
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75 */
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76 @Override
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77 public final FrameState stateBefore() {
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78 return stateBefore;
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79 }
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80 }