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annotate graal/GraalCompiler/src/com/sun/c1x/opt/InstructionSubstituter.java @ 2602:0c6564c254af
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 06 May 2011 10:25:37 +0200 |
parents | 3fca504f28ba |
children | 3558ca7088c0 |
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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.opt; |
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24 |
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25 import com.sun.c1x.ir.*; |
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26 import com.sun.c1x.value.*; |
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27 import com.sun.c1x.graph.IR; |
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28 |
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29 /** |
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30 * This class allows instructions to be substituted within an IR graph. It allows |
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31 * registering substitutions and iterates over the instructions of a program and replaces |
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32 * the occurrence of each instruction with its substitution, if it has one. |
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33 * |
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34 * @author Ben L. Titzer |
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35 */ |
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36 public final class InstructionSubstituter implements BlockClosure, ValueClosure { |
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37 |
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38 final IR ir; |
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39 boolean hasSubstitution; |
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40 |
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41 public InstructionSubstituter(IR ir) { |
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42 this.ir = ir; |
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43 } |
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44 |
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45 public void apply(BlockBegin block) { |
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46 Instruction last = null; |
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47 if (block.exceptionHandlerStates() != null) { |
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48 for (FrameState s : block.exceptionHandlerStates()) { |
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49 s.valuesDo(this); |
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50 } |
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51 } |
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52 for (Instruction n = block; n != null; n = last.next()) { |
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53 n.allValuesDo(this); |
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54 if (n.subst != null && last != null) { |
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55 // this instruction has a substitution, skip it |
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56 last.resetNext(n.next()); |
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57 } else { |
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58 last = n; |
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59 } |
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60 } |
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61 } |
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62 |
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63 public void finish() { |
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64 if (hasSubstitution) { |
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65 ir.startBlock.iterateAnyOrder(this, false); |
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66 } |
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67 } |
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68 |
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69 public boolean hasSubst(Value i) { |
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70 return i.subst != null; |
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71 } |
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72 |
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73 public void setSubst(Value i, Value n) { |
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74 if (i == n) { |
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75 i.subst = null; |
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76 } else { |
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77 hasSubstitution = true; |
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78 i.subst = n; |
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79 } |
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80 } |
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81 |
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82 public Value getSubst(Value i) { |
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83 Value p = i; |
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84 while (true) { |
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85 if (p.subst == null) { |
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86 break; |
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87 } |
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88 p = p.subst; |
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89 } |
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90 return p; |
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91 } |
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92 |
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93 public Value apply(Value i) { |
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94 if (i != null) { |
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95 return getSubst(i); |
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96 } |
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97 return i; |
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98 } |
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99 } |