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annotate graal/Compiler/src/com/sun/c1x/opt/InstructionSubstituter.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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2507
9ec15d6914ca Pull over of compiler from maxine repository.
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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 }