/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.osr;
import java.util.LinkedList;
import java.util.ListIterator;
import org.jikesrvm.compilers.opt.ir.Instruction;
/**
* VariableMap, non-encoded yet
* <pre>
* VariableMap ---> LinkedList of VariableMapElement
* VariableMapElement ---> (OsrPoint, LinkedList of MethodVariables)
* MethodVariables ---> (Method, PC, List of LocalRegTuple)
* LocalRegTuple ---> ( LocalNum, regOp, Type ) or ( StackNum, regOp, Type )
* </pre>
* *
*/
public final class VariableMap {
/* A list of VariableMapElement */
public final LinkedList<VariableMapElement> list = new LinkedList<VariableMapElement>();
public int getNumberOfElements() {
return list.size();
}
/**
* Inserts a new entry into the GCIRMap
* @param inst the IR instruction we care about
* @param mvarList the set of symbolic registers as a list
*/
public void insert(Instruction inst, LinkedList<MethodVariables> mvarList) {
// make a VariableMapElement and put it on the big list
list.add(new VariableMapElement(inst, mvarList));
}
/**
* Inserts a new entry at the begin of the list.
*
* @param inst the IR instruction we care about
* @param mvarList the set of symbolic registers as a list
*/
public void insertFirst(Instruction inst, LinkedList<MethodVariables> mvarList) {
list.addFirst(new VariableMapElement(inst, mvarList));
}
/**
* Creates and returns an enumerator for this object
* @return an iterator for this object
*/
public ListIterator<VariableMapElement> iterator() {
return list.listIterator(0);
}
/**
* @return string version of this object
*/
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
if (list.isEmpty()) {
buf.append("empty");
} else {
for (VariableMapElement ptr : list) {
buf.append(ptr.toString());
}
}
return buf.toString();
}
}