Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/StateSplit.java @ 2812:d27bdbec3d67
Removed ArrayLength from CFG. Fixed an issue when scheduling Merge instructions within a block.
If a block only consists of a single Merge instruction, we have to schedule this instruction as the first instruction.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Mon, 30 May 2011 15:24:26 +0200 |
parents | 027adfafd47e |
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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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34 |
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35 private static final int INPUT_COUNT = 1; |
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36 private static final int INPUT_STATE_BEFORE = 0; |
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37 |
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38 private static final int SUCCESSOR_COUNT = 1; |
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39 private static final int SUCCESSOR_STATE_AFTER = 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 state for this instruction. |
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53 */ |
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54 public FrameState stateBefore() { |
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55 return (FrameState) inputs().get(super.inputCount() + INPUT_STATE_BEFORE); |
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56 } |
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57 |
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58 public FrameState setStateBefore(FrameState n) { |
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59 FrameState oldState = stateBefore(); |
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60 try { |
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61 return (FrameState) inputs().set(super.inputCount() + INPUT_STATE_BEFORE, n); |
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62 } finally { |
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63 if (oldState != n && oldState != null) { |
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64 oldState.delete(); |
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65 } |
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66 } |
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67 } |
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68 |
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69 /** |
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70 * The state for this instruction. |
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71 */ |
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72 @Override |
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73 public FrameState stateAfter() { |
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74 return (FrameState) successors().get(super.successorCount() + SUCCESSOR_STATE_AFTER); |
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75 } |
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76 |
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77 public FrameState setStateAfter(FrameState n) { |
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78 return (FrameState) successors().set(super.successorCount() + SUCCESSOR_STATE_AFTER, n); |
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79 } |
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80 |
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81 /** |
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82 * Creates a new state split with the specified value type. |
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83 * @param kind the type of the value that this instruction produces |
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84 * @param inputCount |
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85 * @param successorCount |
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86 * @param graph |
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87 */ |
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88 public StateSplit(CiKind kind, int inputCount, int successorCount, Graph graph) { |
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89 super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph); |
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90 } |
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91 |
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92 public boolean needsStateAfter() { |
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93 return true; |
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94 } |
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95 } |