Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/asm/Label.java @ 2546:e1b3db8031ee
Removed liveness marking.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 21:54:31 +0200 |
parents | 16b9a8b5ad39 |
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rev | line source |
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2507
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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.asm; |
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24 |
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25 import com.sun.c1x.util.*; |
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26 |
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27 /** |
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28 * This class represents a label within assembly code. |
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29 * |
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30 * @author Marcelo Cintra |
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31 */ |
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32 public final class Label { |
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33 |
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34 private int position = -1; |
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35 |
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36 /** |
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37 * References to instructions that jump to this unresolved label. |
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38 * These instructions need to be patched when the label is bound |
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39 * using the {@link #patchInstructions(AbstractAssembler)} method. |
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40 */ |
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41 private IntList patchPositions = new IntList(4); |
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42 |
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43 /** |
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44 * Returns the position of this label in the code buffer. |
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45 * @return the position |
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46 */ |
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47 public int position() { |
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48 assert position >= 0 : "Unbound label is being referenced"; |
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49 return position; |
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50 } |
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51 |
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52 public Label() { |
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53 } |
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54 |
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55 public Label(int position) { |
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56 bind(position); |
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57 } |
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58 |
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59 /** |
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60 * Binds the label to the specified position. |
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61 * @param pos the position |
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62 */ |
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63 public void bind(int pos) { |
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64 this.position = pos; |
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65 assert isBound(); |
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66 } |
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67 |
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68 public boolean isBound() { |
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69 return position >= 0; |
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70 } |
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71 |
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72 public void addPatchAt(int branchLocation) { |
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73 assert !isBound() : "Label is already bound"; |
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74 patchPositions.add(branchLocation); |
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75 } |
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76 |
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77 public void patchInstructions(AbstractAssembler masm) { |
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78 assert isBound() : "Label should be bound"; |
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79 int target = position; |
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80 for (int i = 0; i < patchPositions.size(); ++i) { |
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81 int pos = patchPositions.get(i); |
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82 masm.patchJumpTarget(pos, target); |
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83 } |
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84 } |
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85 |
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86 @Override |
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87 public String toString() { |
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88 return "label"; |
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89 } |
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90 } |