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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Throw.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/ir/Throw.java@9ec15d6914ca
children 0c6564c254af
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.debug.*;
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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 Throw} instruction represents a throw of an exception.
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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 final class Throw extends BlockEnd {
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35
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36 Value exception;
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37
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38 FrameState stateBefore;
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39
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40 /**
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41 * Creates a new Throw instruction.
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42 * @param exception the instruction that generates the exception to throw
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43 * @param stateAfter the state before the exception is thrown but after the exception object has been popped
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44 * @param isSafepoint {@code true} if this instruction is a safepoint instruction
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45 */
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46 public Throw(Value exception, FrameState stateAfter, boolean isSafepoint) {
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47 super(CiKind.Illegal, null, isSafepoint);
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48 this.stateBefore = stateAfter;
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49 this.exception = exception;
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50 }
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51
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52 /**
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53 * Gets the instruction which produces the exception to throw.
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54 * @return the instruction producing the exception
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55 */
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56 public Value exception() {
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57 return exception;
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58 }
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59
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60 /**
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61 * Returns the state before this throw would occur.
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62 * @return the state before the throw
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63 */
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64 @Override
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65 public FrameState stateBefore() {
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66 return stateBefore;
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67 }
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68
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69 /**
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70 * Checks whether this instruction can trap.
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71 * @return {@code true} because this instruction definitely throws an exception!
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72 */
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73 @Override
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74 public boolean canTrap() {
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75 return true;
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76 }
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77
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78 @Override
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79 public void inputValuesDo(ValueClosure closure) {
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80 exception = closure.apply(exception);
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81 }
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82
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83 @Override
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84 public void accept(ValueVisitor v) {
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85 v.visitThrow(this);
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86 }
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87
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88 @Override
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89 public void print(LogStream out) {
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90 out.print("throw ").print(exception());
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91 }
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92 }