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annotate graal/GraalCompiler/src/com/sun/c1x/asm/Label.java @ 2611:bd235cb4375a

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FrameState cleanup: split into FrameStateBuilder and fixed-size FrameState, removed MutableFrameState
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 06 May 2011 17:08:00 +0200
parents 16b9a8b5ad39
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 }