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/*
* $Id: SlotAllocator.java,v 1.10 2010-11-01 04:34:20 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
import com.sun.org.apache.bcel.internal.generic.Type;
/**
* @author Jacek Ambroziak
*/
final class SlotAllocator {
private int _firstAvailableSlot;
private int _size = 8;
private int _free = 0;
private int[] _slotsTaken = new int[_size];
public void initialize(LocalVariableGen[] vars) {
final int length = vars.length;
int slot = 0, size, index;
for (int i = 0; i < length; i++) {
size = vars[i].getType().getSize();
index = vars[i].getIndex();
slot = Math.max(slot, index + size);
}
_firstAvailableSlot = slot;
}
public int allocateSlot(Type type) {
final int size = type.getSize();
final int limit = _free;
int slot = _firstAvailableSlot, where = 0;
if (_free + size > _size) {
final int[] array = new int[_size *= 2];
for (int j = 0; j < limit; j++)
array[j] = _slotsTaken[j];
_slotsTaken = array;
}
while (where < limit) {
if (slot + size <= _slotsTaken[where]) {
// insert
for (int j = limit - 1; j >= where; j--)
_slotsTaken[j + size] = _slotsTaken[j];
break;
}
else {
slot = _slotsTaken[where++] + 1;
}
}
for (int j = 0; j < size; j++)
_slotsTaken[where + j] = slot + j;
_free += size;
return slot;
}
public void releaseSlot(LocalVariableGen lvg) {
final int size = lvg.getType().getSize();
final int slot = lvg.getIndex();
final int limit = _free;
for (int i = 0; i < limit; i++) {
if (_slotsTaken[i] == slot) {
int j = i + size;
while (j < limit) {
_slotsTaken[i++] = _slotsTaken[j++];
}
_free -= size;
return;
}
}
String state = "Variable slot allocation error"+
"(size="+size+", slot="+slot+", limit="+limit+")";
ErrorMsg err = new ErrorMsg(ErrorMsg.INTERNAL_ERR, state);
throw new Error(err.toString());
}
}