Mercurial > hg > graal-compiler
annotate graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Label.java @ 21720:d915361cc3a1
moved asm, bytecode and asm.test code back to com.oracle.graal name space (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 04 Jun 2015 13:35:47 +0200 |
parents | graal/com.oracle.jvmci.asm/src/com/oracle/jvmci/asm/Label.java@6df25b1418be |
children | 27943aac2e3c |
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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.oracle.graal.asm; |
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24 |
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25 import java.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 public final class Label { |
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31 |
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32 private int position = -1; |
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33 private int blockId = -1; |
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34 |
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35 /** |
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36 * References to instructions that jump to this unresolved label. These instructions need to be |
14034 | 37 * patched when the label is bound using the {@link #patchInstructions(Assembler)} method. |
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38 */ |
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39 private ArrayList<Integer> patchPositions = null; |
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40 |
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41 /** |
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42 * Returns the position of this label in the code buffer. |
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43 * |
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44 * @return the position |
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45 */ |
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46 public int position() { |
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47 assert position >= 0 : "Unbound label is being referenced"; |
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48 return position; |
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49 } |
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50 |
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51 public Label() { |
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52 } |
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53 |
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54 public Label(int id) { |
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55 blockId = id; |
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56 } |
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57 |
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58 public int getBlockId() { |
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59 return blockId; |
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60 } |
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61 |
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62 /** |
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63 * Binds the label to the specified position. |
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64 * |
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65 * @param pos the position |
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66 */ |
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67 protected void bind(int pos) { |
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68 this.position = pos; |
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69 assert isBound(); |
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70 } |
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71 |
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72 public boolean isBound() { |
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73 return position >= 0; |
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74 } |
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75 |
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76 public void addPatchAt(int branchLocation) { |
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77 assert !isBound() : "Label is already bound " + this + " " + branchLocation + " at position " + position; |
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78 if (patchPositions == null) { |
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79 patchPositions = new ArrayList<>(2); |
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80 } |
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81 patchPositions.add(branchLocation); |
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82 } |
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83 |
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84 protected void patchInstructions(Assembler masm) { |
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85 assert isBound() : "Label should be bound"; |
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86 if (patchPositions != null) { |
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87 int target = position; |
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88 for (int i = 0; i < patchPositions.size(); ++i) { |
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89 int pos = patchPositions.get(i); |
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90 masm.patchJumpTarget(pos, target); |
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91 } |
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92 } |
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93 } |
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94 |
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95 public void reset() { |
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96 if (this.patchPositions != null) { |
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97 this.patchPositions.clear(); |
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98 } |
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99 this.position = -1; |
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100 } |
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101 |
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102 @Override |
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103 public String toString() { |
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104 return isBound() ? String.valueOf(position()) : "?"; |
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105 } |
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106 } |