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annotate graal/GraalCompiler/src/com/sun/c1x/ir/StateSplit.java @ 2565:cc1f1d396288

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Remove inlining (3rd part)
author Gilles Duboscq <gilles.duboscq@oracle.com>
date Fri, 29 Apr 2011 16:46:30 +0200
parents c58a301eb2d7
children fec99fc30af1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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(-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 @Override
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53 public boolean canTrap() {
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54 return stateBefore != null;
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55 }
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56
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57 /**
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58 * Records the state of this instruction before it is executed.
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59 *
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60 * @param stateBefore the state
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61 */
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62 public final void setStateBefore(FrameState stateBefore) {
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63 assert this.stateBefore == null;
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64 this.stateBefore = stateBefore;
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65 }
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66
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67 /**
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68 * Gets the state for this instruction.
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69 * @return the state
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70 */
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71 @Override
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72 public final FrameState stateBefore() {
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73 return stateBefore;
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74 }
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75 }