package miniJVM.cmd;
import miniJVM.clz.ClassFile;
import miniJVM.constant.ConstantPool;
import miniJVM.constant.FieldRefInfo;
import miniJVM.constant.NameAndTypeInfo;
import miniJVM.engine.ExecutionResult;
import miniJVM.engine.JavaObject;
import miniJVM.engine.StackFrame;
public class PutFieldCmd extends TwoOperandCmd {
public PutFieldCmd(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 fieldRef = (FieldRefInfo) this.getConstantInfo(this.getIndex());
NameAndTypeInfo nameAndTypeInfo = (NameAndTypeInfo) fieldRef.getConstantInfo(fieldRef.getNameAndTypeIndex());
String fieldName = nameAndTypeInfo.getName();
JavaObject fieldValue = frame.getOperandStack().pop();
JavaObject objectRef = frame.getOperandStack().pop();
objectRef.setFieldValue(fieldName, fieldValue);
}
}