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annotate graal/GraalCompiler/src/com/sun/c1x/lir/LIRTableSwitch.java @ 2789:aeccd2af4e9e
Fixes around critical edge split and placeholder removal after goto removal.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 25 May 2011 16:48:28 +0200 |
parents | 5e8a69041cd7 |
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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.lir; |
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24 |
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25 import com.sun.cri.ci.*; |
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26 |
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27 /** |
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28 * @author Doug Simon |
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29 */ |
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30 public class LIRTableSwitch extends LIRInstruction { |
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31 |
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32 public LIRBlock defaultTarget; |
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33 |
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34 public final LIRBlock[] targets; |
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35 |
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36 public final int lowKey; |
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37 |
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38 public LIRTableSwitch(CiValue value, int lowKey, LIRBlock defaultTarget, LIRBlock[] targets) { |
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39 super(LIROpcode.TableSwitch, CiValue.IllegalValue, null, false, 1, 0, value); |
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40 this.lowKey = lowKey; |
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41 this.targets = targets; |
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42 this.defaultTarget = defaultTarget; |
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43 } |
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44 |
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45 @Override |
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46 public void emitCode(LIRAssembler masm) { |
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47 masm.emitTableSwitch(this); |
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48 } |
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49 |
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50 /** |
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51 * @return the input value to this switch |
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52 */ |
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53 public CiValue value() { |
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54 return operand(0); |
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55 } |
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56 |
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57 @Override |
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58 public String operationString(OperandFormatter operandFmt) { |
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59 StringBuilder buf = new StringBuilder(super.operationString(operandFmt)); |
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60 buf.append("\ndefault: [B").append(defaultTarget.blockID()).append(']'); |
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61 int key = lowKey; |
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62 for (LIRBlock b : targets) { |
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63 buf.append("\ncase ").append(key).append(": [B").append(b.blockID()).append(']'); |
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64 key++; |
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65 } |
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66 return buf.toString(); |
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67 } |
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68 |
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69 |
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70 private LIRBlock substitute(LIRBlock block, LIRBlock oldBlock, LIRBlock newBlock) { |
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71 if (block == oldBlock) { |
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72 LIRInstruction instr = newBlock.lir().instructionsList().get(0); |
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73 assert instr instanceof LIRLabel : "first instruction of block must be label"; |
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74 return newBlock; |
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75 } |
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76 return oldBlock; |
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77 } |
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78 |
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79 public void substitute(LIRBlock oldBlock, LIRBlock newBlock) { |
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80 if (substitute(defaultTarget, oldBlock, newBlock) == newBlock) { |
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81 defaultTarget = newBlock; |
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82 } |
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83 for (int i = 0; i < targets.length; i++) { |
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84 if (substitute(targets[i], oldBlock, newBlock) == newBlock) { |
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85 targets[i] = newBlock; |
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86 } |
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87 } |
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88 } |
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89 } |