package com.github.miniyk2012.coding2017.coderising.jvm.attr;
import com.github.miniyk2012.coding2017.coderising.jvm.constant.ConstantPool;
import com.github.miniyk2012.coding2017.coderising.jvm.loader.ByteCodeIterator;
import java.util.ArrayList;
import java.util.List;
public class LocalVariableTable extends AttributeInfo{
List<LocalVariableItem> items = new ArrayList<>();
public LocalVariableTable(int attrNameIndex, int attrLen) {
super(attrNameIndex, attrLen);
}
private void addLocalVariableItem(LocalVariableItem item) {
this.items.add(item);
}
public static LocalVariableTable parse(ByteCodeIterator iter){
int nameIndex = iter.nextU2toInt();
int attrLen = iter.nextU4toInt();
LocalVariableTable table = new LocalVariableTable(nameIndex, attrLen);
int tableLen = iter.nextU2toInt();
for(int i=0; i<tableLen; i++) {
LocalVariableItem item = new LocalVariableItem();
item.setStartPC(iter.nextU2toInt());
item.setLength(iter.nextU2toInt());
item.setNameIndex(iter.nextU2toInt());
item.setDescIndex(iter.nextU2toInt());
item.setIndex(iter.nextU2toInt());
table.addLocalVariableItem(item);
}
return table;
}
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();
}
}