Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.max.asm/src/com/oracle/max/asm/Label.java @ 5174:9afe7747f988
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author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 29 Mar 2012 13:22:25 +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.oracle.max.asm; |
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24 |
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25 import java.util.ArrayList; |
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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 private int position = -1; |
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32 |
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33 /** |
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34 * References to instructions that jump to this unresolved label. |
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35 * These instructions need to be patched when the label is bound |
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36 * using the {@link #patchInstructions(AbstractAssembler)} method. |
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37 */ |
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38 private ArrayList<Integer> patchPositions = new ArrayList<>(4); |
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39 |
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40 /** |
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41 * Returns the position of this label in the code buffer. |
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42 * @return the position |
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43 */ |
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44 public int position() { |
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45 assert position >= 0 : "Unbound label is being referenced"; |
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46 return position; |
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47 } |
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48 |
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49 public Label() { |
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50 } |
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51 |
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52 /** |
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53 * Binds the label to the specified position. |
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54 * @param pos the position |
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55 */ |
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56 protected void bind(int pos) { |
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57 this.position = pos; |
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58 assert isBound(); |
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59 } |
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60 |
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61 public boolean isBound() { |
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62 return position >= 0; |
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63 } |
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64 |
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65 public void addPatchAt(int branchLocation) { |
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66 assert !isBound() : "Label is already bound"; |
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67 patchPositions.add(branchLocation); |
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68 } |
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69 |
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70 protected void patchInstructions(AbstractAssembler masm) { |
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71 assert isBound() : "Label should be bound"; |
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72 int target = position; |
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73 for (int i = 0; i < patchPositions.size(); ++i) { |
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74 int pos = patchPositions.get(i); |
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75 masm.patchJumpTarget(pos, target); |
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76 } |
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77 } |
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78 |
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79 @Override |
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80 public String toString() { |
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81 return isBound() ? String.valueOf(position()) : "?"; |
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82 } |
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83 } |