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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Return.java @ 2827:bd17ac598c6e

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Graph cloning, initial version (not completely working)
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 30 May 2011 18:46:57 +0200
parents 93fd92c9f8b0
children bfce42cd9c07
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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.cri.ci.*;
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28
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29 /**
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30 * The {@code Return} class definition.
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31 */
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32 public final class Return extends BlockEnd {
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33
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34 private static final int INPUT_COUNT = 1;
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35 private static final int INPUT_RESULT = 0;
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36
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37 private static final int SUCCESSOR_COUNT = 1;
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38 private static final int SUCCESSOR_END = 0;
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39
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40 @Override
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41 protected int inputCount() {
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42 return super.inputCount() + INPUT_COUNT;
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43 }
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44
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45 @Override
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46 protected int successorCount() {
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47 return super.successorCount() + SUCCESSOR_COUNT;
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48 }
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49
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50 /**
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51 * The instruction that produces the result for the return.
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52 */
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53 public Value result() {
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54 return (Value) inputs().get(super.inputCount() + INPUT_RESULT);
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55 }
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56
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57 public Value setResult(Value n) {
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58 return (Value) inputs().set(super.inputCount() + INPUT_RESULT, n);
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59 }
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60
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61 @Override
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62 public Instruction next() {
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63 return null;
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64 }
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65
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66 /**
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67 * Constructs a new Return instruction.
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68 * @param result the instruction producing the result for this return; {@code null} if this
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69 * is a void return
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70 * @param graph
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71 */
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72 public Return(Value result, Graph graph) {
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73 super(result == null ? CiKind.Void : result.kind, 0, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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74 setResult(result);
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75 successors().set(SUCCESSOR_END, graph.end());
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76 }
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77
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78 @Override
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79 public void accept(ValueVisitor v) {
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80 v.visitReturn(this);
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81 }
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82
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83 @Override
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84 public void print(LogStream out) {
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85 if (result() == null) {
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86 out.print("return");
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87 } else {
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88 out.print(kind.typeChar).print("return ").print(result());
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89 }
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90 }
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91
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92 @Override
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93 public Node copy(Graph into) {
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94 Return x = new Return(null, into);
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95 x.setNonNull(isNonNull());
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96 return x;
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97 }
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98 }