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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Throw.java @ 2639:8e96b2b3a866

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Added stateBefore to Throw instruction.
author Thomas Wuerthinger <thomas@wuerthinger.net>
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 }