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104 lines (92 loc) · 3.34 KB
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1997-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Roger Lawrence
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
package org.mozilla.javascript;
public class Label {
private static final int FIXUPTABLE_SIZE = 8;
private static final boolean DEBUG = true;
public Label()
{
itsPC = -1;
}
public short getPC()
{
return itsPC;
}
public void fixGotos(byte theCodeBuffer[])
{
if (DEBUG) {
if ((itsPC == -1) && (itsFixupTable != null))
throw new RuntimeException("Unlocated label");
}
if (itsFixupTable != null) {
for (int i = 0; i < itsFixupTableTop; i++) {
int fixupSite = itsFixupTable[i];
// -1 to get delta from instruction start
short offset = (short)(itsPC - (fixupSite - 1));
theCodeBuffer[fixupSite++] = (byte)(offset >> 8);
theCodeBuffer[fixupSite] = (byte)offset;
}
}
itsFixupTable = null;
}
public void setPC(short thePC)
{
if (DEBUG) {
if ((itsPC != -1) && (itsPC != thePC))
throw new RuntimeException("Duplicate label");
}
itsPC = thePC;
}
public void addFixup(int fixupSite)
{
if (itsFixupTable == null) {
itsFixupTableTop = 1;
itsFixupTable = new int[FIXUPTABLE_SIZE];
itsFixupTable[0] = fixupSite;
}
else {
if (itsFixupTableTop == itsFixupTable.length) {
int oldLength = itsFixupTable.length;
int newTable[] = new int[oldLength + FIXUPTABLE_SIZE];
System.arraycopy(itsFixupTable, 0, newTable, 0, oldLength);
itsFixupTable = newTable;
}
itsFixupTable[itsFixupTableTop++] = fixupSite;
}
}
private short itsPC;
private int itsFixupTable[];
private int itsFixupTableTop;
}