Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Throw.java @ 2639:8e96b2b3a866
Added stateBefore to Throw instruction.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 13:41:35 +0200 |
parents | 91d3952f7eb7 |
children | 440ceca8e3d7 |
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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.debug.*; |
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27 import com.sun.c1x.value.*; |
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28 import com.sun.cri.ci.*; |
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29 |
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30 /** |
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31 * The {@code Throw} instruction represents a throw of an exception. |
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32 */ |
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33 public final class Throw extends BlockEnd { |
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34 |
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35 private static final int INPUT_COUNT = 2; |
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36 private static final int INPUT_EXCEPTION = 0; |
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37 private static final int INPUT_STATE_BEFORE = 1; |
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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 which produces the exception to throw. |
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53 */ |
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54 public Value exception() { |
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55 return (Value) inputs().get(super.inputCount() + INPUT_EXCEPTION); |
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56 } |
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57 |
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58 public Value setException(Value n) { |
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59 return (Value) inputs().set(super.inputCount() + INPUT_EXCEPTION, n); |
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60 } |
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61 |
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62 /** |
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63 * The state for this instruction. |
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64 */ |
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65 public FrameState stateBefore() { |
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66 return (FrameState) inputs().get(super.inputCount() + INPUT_STATE_BEFORE); |
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67 } |
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68 |
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69 public FrameState setStateBefore(FrameState n) { |
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70 return (FrameState) inputs().set(super.inputCount() + INPUT_STATE_BEFORE, n); |
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71 } |
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72 |
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73 /** |
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74 * Creates a new Throw instruction. |
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75 * @param exception the instruction that generates the exception to throw |
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76 * @param stateAfter the state before the exception is thrown but after the exception object has been popped |
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77 * @param isSafepoint {@code true} if this instruction is a safepoint instruction |
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78 * @param graph |
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79 */ |
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80 public Throw(Value exception, boolean isSafepoint, Graph graph) { |
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81 super(CiKind.Illegal, null, isSafepoint, 0, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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82 setException(exception); |
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83 } |
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84 |
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85 /** |
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86 * Checks whether this instruction can trap. |
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87 * @return {@code true} because this instruction definitely throws an exception! |
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88 */ |
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89 @Override |
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90 public boolean canTrap() { |
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91 return true; |
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92 } |
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93 |
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94 @Override |
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95 public void accept(ValueVisitor v) { |
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96 v.visitThrow(this); |
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97 } |
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98 |
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99 @Override |
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100 public void print(LogStream out) { |
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101 out.print("throw ").print(exception()); |
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102 } |
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103 } |