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annotate graal/com.oracle.max.asm/src/com/oracle/max/asm/Label.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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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 }