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1 /*
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2 * Copyright 2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.compiler;
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26
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27 import sun.jvm.hotspot.code.*;
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28
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29 public class OopMapStream {
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30 private CompressedReadStream stream;
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31 private OopMap oopMap;
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32 private int mask;
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33 private int size;
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34 private int position;
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35 private OopMapValue omv;
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36 private boolean omvValid;
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37
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38 public OopMapStream(OopMap oopMap) {
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39 this(oopMap, (OopMapValue.OopTypes[]) null);
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40 }
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41
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42 public OopMapStream(OopMap oopMap, OopMapValue.OopTypes type) {
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43 this(oopMap, (OopMapValue.OopTypes[]) null);
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44 mask = type.getValue();
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45 }
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46
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47 public OopMapStream(OopMap oopMap, OopMapValue.OopTypes[] types) {
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48 if (oopMap.getOMVData() == null) {
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49 stream = new CompressedReadStream(oopMap.getWriteStream().getBuffer());
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50 } else {
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51 stream = new CompressedReadStream(oopMap.getOMVData());
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52 }
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53 mask = computeMask(types);
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54 size = (int) oopMap.getOMVCount();
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55 position = 0;
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56 omv = new OopMapValue();
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57 omvValid = false;
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58 }
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59
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60 public boolean isDone() {
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61 if (!omvValid) {
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62 findNext();
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63 }
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64 return !omvValid;
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65 }
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66
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67 public void next() {
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68 findNext();
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69 }
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70
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71 public OopMapValue getCurrent() {
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72 return omv;
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73 }
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74
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75 //--------------------------------------------------------------------------------
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76 // Internals only below this point
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77 //
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78
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79 private int computeMask(OopMapValue.OopTypes[] types) {
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80 mask = 0;
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81 if (types != null) {
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82 for (int i = 0; i < types.length; i++) {
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83 mask |= types[i].getValue();
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84 }
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85 }
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86 return mask;
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87 }
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88
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89 private void findNext() {
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90 while (position++ < size) {
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91 omv.readFrom(stream);
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92 if ((omv.getType().getValue() & mask) > 0) {
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93 omvValid = true;
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94 return;
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95 }
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96 }
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97 omvValid = false;
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98 }
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99 }
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