1 /* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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3 * The contents of this file are subject to the Netscape Public
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4 * License Version 1.1 (the "License"); you may not use this file
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5 * except in compliance with the License. You may obtain a copy of
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6 * the License at http://www.mozilla.org/NPL/
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8 * Software distributed under the License is distributed on an "AS
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9 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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10 * implied. See the License for the specific language governing
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11 * rights and limitations under the License.
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13 * The Original Code is Rhino code, released
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16 * The Initial Developer of the Original Code is Netscape
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17 * Communications Corporation. Portions created by Netscape are
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18 * Copyright (C) 1997-1999 Netscape Communications Corporation. All
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24 * Alternatively, the contents of this file may be used under the
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25 * terms of the GNU Public License (the "GPL"), in which case the
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26 * provisions of the GPL are applicable instead of those above.
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27 * If you wish to allow use of your version of this file only
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28 * under the terms of the GPL and not to allow others to use your
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29 * version of this file under the NPL, indicate your decision by
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30 * deleting the provisions above and replace them with the notice
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31 * and other provisions required by the GPL. If you do not delete
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32 * the provisions above, a recipient may use your version of this
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33 * file under either the NPL or the GPL.
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36 package org.mozilla.javascript;
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38 public class LabelTable {
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40 private static final boolean DEBUGLABELS = false;
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42 private static final int LabelTableSize = 32;
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43 protected Label itsLabelTable[];
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44 protected int itsLabelTableTop;
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46 public int acquireLabel()
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48 if (itsLabelTable == null) {
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49 itsLabelTable = new Label[LabelTableSize];
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50 itsLabelTable[0] = new Label();
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51 itsLabelTableTop = 1;
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55 if (itsLabelTableTop == itsLabelTable.length) {
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56 Label oldTable[] = itsLabelTable;
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57 itsLabelTable = new Label[itsLabelTableTop * 2];
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58 System.arraycopy(oldTable, 0, itsLabelTable, 0, itsLabelTableTop);
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60 itsLabelTable[itsLabelTableTop] = new Label();
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61 int result = itsLabelTableTop++;
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62 return result | 0x80000000;
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66 public int markLabel(int theLabel, int pc)
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69 if ((theLabel & 0x80000000) != 0x80000000)
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70 throw new RuntimeException("Bad label, no biscuit");
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72 theLabel &= 0x7FFFFFFF;
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74 System.out.println("Marking label " + theLabel + " at " + pc);
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76 itsLabelTable[theLabel].setPC((short)pc);
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77 return theLabel | 0x80000000;
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