package com.github.ipk2015.coding2017.minijvm.cmd;
import com.github.ipk2015.coding2017.minijvm.clz.ClassFile;
import com.github.ipk2015.coding2017.minijvm.constant.ConstantPool;
import com.github.ipk2015.coding2017.minijvm.constant.FieldRefInfo;
import com.github.ipk2015.coding2017.minijvm.engine.ExecutionResult;
import com.github.ipk2015.coding2017.minijvm.engine.JavaObject;
import com.github.ipk2015.coding2017.minijvm.engine.StackFrame;
public class GetFieldCmd extends TwoOperandCmd {
public GetFieldCmd(ClassFile clzFile,String opCode) {
super(clzFile,opCode);
}
@Override
public String toString(ConstantPool pool) {
return super.getOperandAsField(pool);
}
@Override
public void execute(StackFrame frame, ExecutionResult result) {
FieldRefInfo fieldRefInfo = (FieldRefInfo)this.getConstantInfo(this.getIndex());
String fieldName = fieldRefInfo.getFieldName();
JavaObject javaObject = frame.getOprandStack().pop();
JavaObject fieldValue = javaObject.getFieldValue(fieldName);
frame.getOprandStack().push(fieldValue);
}
}