81 lines
2.8 KiB
Java
81 lines
2.8 KiB
Java
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Rhino code, released
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* May 6, 1999.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1997-1999 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Roger Lawrence
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the NPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the NPL or the GPL.
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*/
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package org.mozilla.javascript;
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public class LabelTable {
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private static final boolean DEBUGLABELS = false;
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private static final int LabelTableSize = 32;
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protected Label itsLabelTable[];
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protected int itsLabelTableTop;
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public int acquireLabel()
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{
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if (itsLabelTable == null) {
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itsLabelTable = new Label[LabelTableSize];
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itsLabelTable[0] = new Label();
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itsLabelTableTop = 1;
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return 0x80000000;
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}
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else {
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if (itsLabelTableTop == itsLabelTable.length) {
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Label oldTable[] = itsLabelTable;
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itsLabelTable = new Label[itsLabelTableTop * 2];
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System.arraycopy(oldTable, 0, itsLabelTable, 0, itsLabelTableTop);
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}
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itsLabelTable[itsLabelTableTop] = new Label();
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int result = itsLabelTableTop++;
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return result | 0x80000000;
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}
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}
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public int markLabel(int theLabel, int pc)
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{
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if (DEBUGLABELS) {
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if ((theLabel & 0x80000000) != 0x80000000)
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throw new RuntimeException("Bad label, no biscuit");
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}
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theLabel &= 0x7FFFFFFF;
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if (DEBUGLABELS) {
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System.out.println("Marking label " + theLabel + " at " + pc);
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}
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itsLabelTable[theLabel].setPC((short)pc);
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return theLabel | 0x80000000;
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}
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}
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