package com.github.ipk2015.coding2017.minijvm.attr;
import java.util.ArrayList;
import java.util.List;
import com.github.ipk2015.coding2017.minijvm.constant.ConstantPool;
import com.github.ipk2015.coding2017.minijvm.loader.ByteCodeIterator;
public class LocalVariableTable extends AttributeInfo{
List<LocalVariableItem> items = new ArrayList<LocalVariableItem>();
public LocalVariableTable(int attrNameIndex, int attrLen) {
super(attrNameIndex, attrLen);
}
public static LocalVariableTable parse(ByteCodeIterator iter){
int attrNameIndex = iter.nextUNToInt(2);
int attrLength = iter.nextUNToInt(4);
LocalVariableTable table = new LocalVariableTable(attrNameIndex,attrLength);
int tableLen = iter.nextUNToInt(2);
for(int i = 0;i < tableLen;i++){
LocalVariableItem item = new LocalVariableItem();
item.setStartPC(iter.nextUNToInt(2));
item.setLength(iter.nextUNToInt(2));
item.setNameIndex(iter.nextUNToInt(2));
item.setDescIndex(iter.nextUNToInt(2));
item.setIndex(iter.nextUNToInt(2));
table.addLocalVariableItem(item);
}
return table;
}
private void addLocalVariableItem(LocalVariableItem item) {
this.items.add(item);
}
public String toString(ConstantPool pool){
StringBuilder buffer = new StringBuilder();
buffer.append("Local Variable Table:\n");
for(LocalVariableItem item : items){
buffer.append("startPC:"+item.getStartPC()).append(",");
buffer.append("name:"+pool.getUTF8String(item.getNameIndex())).append(",");
buffer.append("desc:"+pool.getUTF8String(item.getDescIndex())).append(",");
buffer.append("slotIndex:"+ item.getIndex()).append("\n");
}
buffer.append("\n");
return buffer.toString();
}
}