package main.coding_170416.jvm.attr;
import main.coding_170416.jvm.constant.ConstantPool;
import main.coding_170416.jvm.loader.ByteCodeIterator;
import java.util.ArrayList;
import java.util.List;
/**
* Created by peter on 2017/4/21.
*/
public class LocalVariableTable extends AttributeInfo {
List<LocalVariableItem> items = new ArrayList<>();
public LocalVariableTable(int attrNameIndex,int attrLen){
super(attrNameIndex,attrLen);
}
public void addLocalVariableItem(LocalVariableItem item){
this.items.add(item);
}
public static LocalVariableTable parse(ByteCodeIterator iterator){
int index = iterator.nextU1ToInt();
int len = iterator.nextU4ToInt();
LocalVariableTable table = new LocalVariableTable(index,len);
int itemLen = iterator.nextU2ToInt();
for(int i=0;i<=itemLen;i++){
LocalVariableItem item =new LocalVariableItem();
item.setStartPC(iterator.nextU2ToInt());
item.setLength(iterator.nextU2ToInt());
item.setNameIndex(iterator.nextU2ToInt());
item.setDescIndex(iterator.nextU2ToInt());
item.setIndex(iterator.nextU2ToInt());
table.addLocalVariableItem(item);
}
return table;
}
public String toString(ConstantPool pool){
StringBuffer buffer = new StringBuffer();
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();
}
}