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annotate graal/Compiler/src/com/sun/c1x/lir/LIRTableSwitch.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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.c1x.ir.*; |
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26 import com.sun.cri.ci.*; |
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27 |
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28 /** |
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29 * @author Doug Simon |
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30 */ |
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31 public class LIRTableSwitch extends LIRInstruction { |
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32 |
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33 public BlockBegin defaultTarget; |
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34 |
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35 public final BlockBegin[] targets; |
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36 |
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37 public final int lowKey; |
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38 |
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39 public LIRTableSwitch(CiValue value, int lowKey, BlockBegin defaultTarget, BlockBegin[] targets) { |
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40 super(LIROpcode.TableSwitch, CiValue.IllegalValue, null, false, 1, 0, value); |
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41 this.lowKey = lowKey; |
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42 this.targets = targets; |
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43 this.defaultTarget = defaultTarget; |
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44 } |
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45 |
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46 @Override |
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47 public void emitCode(LIRAssembler masm) { |
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48 masm.emitTableSwitch(this); |
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49 } |
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50 |
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51 /** |
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52 * @return the input value to this switch |
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53 */ |
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54 public CiValue value() { |
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55 return operand(0); |
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56 } |
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57 |
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58 @Override |
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59 public String operationString(OperandFormatter operandFmt) { |
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60 StringBuilder buf = new StringBuilder(super.operationString(operandFmt)); |
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61 buf.append("\ndefault: [B").append(defaultTarget.blockID).append(']'); |
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62 int key = lowKey; |
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63 for (BlockBegin b : targets) { |
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64 buf.append("\ncase ").append(key).append(": [B").append(b.blockID).append(']'); |
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65 key++; |
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66 } |
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67 return buf.toString(); |
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68 } |
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69 |
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70 private BlockBegin substitute(BlockBegin block, BlockBegin oldBlock, BlockBegin 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(BlockBegin oldBlock, BlockBegin 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 } |