Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/opt/InstructionSubstituter.java @ 2635:0f69be73d5ce
More frame state fixes.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 11:21:15 +0200 |
parents | 3558ca7088c0 |
children | 7ed72769d51a |
rev | line source |
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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 public final class InstructionSubstituter implements BlockClosure, ValueClosure { |
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35 |
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36 final IR ir; |
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37 boolean hasSubstitution; |
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38 |
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39 public InstructionSubstituter(IR ir) { |
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40 this.ir = ir; |
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41 } |
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42 |
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43 public void apply(BlockBegin block) { |
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44 Instruction last = null; |
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45 if (block.exceptionHandlerStates() != null) { |
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46 for (FrameState s : block.exceptionHandlerStates()) { |
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47 s.inputValuesDo(this); |
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48 } |
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49 } |
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50 for (Instruction n = block; n != null; n = last.next()) { |
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51 n.allValuesDo(this); |
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52 if (n.subst != null && last != null) { |
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53 // this instruction has a substitution, skip it |
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54 last.resetNext(n.next()); |
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55 } else { |
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56 last = n; |
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57 } |
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58 } |
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59 } |
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60 |
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61 public void finish() { |
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62 if (hasSubstitution) { |
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63 ir.startBlock.iterateAnyOrder(this, false); |
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64 } |
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65 } |
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66 |
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67 public boolean hasSubst(Value i) { |
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68 return i.subst != null; |
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69 } |
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70 |
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71 public void setSubst(Value i, Value n) { |
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72 if (i == n) { |
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73 i.subst = null; |
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74 } else { |
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75 hasSubstitution = true; |
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76 i.subst = n; |
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77 } |
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78 } |
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79 |
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80 public Value getSubst(Value i) { |
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81 Value p = i; |
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82 while (true) { |
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83 if (p.subst == null) { |
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84 break; |
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85 } |
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86 p = p.subst; |
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87 } |
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88 return p; |
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89 } |
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90 |
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91 public Value apply(Value i) { |
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92 if (i instanceof FrameState) { |
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93 FrameState state = (FrameState) i; |
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94 state.inputValuesDo(this); |
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95 } |
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96 if (i != null) { |
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97 return getSubst(i); |
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98 } |
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99 return i; |
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100 } |
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101 } |