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1 /*
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2 * Copyright 2001-2005 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.oops;
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26
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27 import sun.jvm.hotspot.code.*;
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28 import sun.jvm.hotspot.debugger.*;
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29
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30 public class CompressedLineNumberReadStream extends CompressedReadStream {
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31 /** Equivalent to CompressedLineNumberReadStream(buffer, 0) */
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32 public CompressedLineNumberReadStream(Address buffer) {
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33 this(buffer, 0);
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34 }
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35
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36 public CompressedLineNumberReadStream(Address buffer, int position) {
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37 super(buffer, position);
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38 }
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39
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40 /** Read (bci, line number) pair from stream. Returns false at end-of-stream. */
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41 public boolean readPair() {
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42 int next = readByte() & 0xFF;
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43 // Check for terminator
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44 if (next == 0) return false;
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45 if (next == 0xFF) {
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46 // Escape character, regular compression used
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47 bci += readSignedInt();
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48 line += readSignedInt();
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49 } else {
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50 // Single byte compression used
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51 bci += next >> 3;
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52 line += next & 0x7;
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53 }
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54 return true;
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55 }
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56
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57 public int bci() { return bci; }
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58 public int line() { return line; }
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59
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60 //--------------------------------------------------------------------------------
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61 // Internals only below this point
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62 //
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63
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64 private int bci;
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65 private int line;
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66 }
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