package minijvm.cmd;
import minijvm.clz.ClassFile;
import minijvm.constant.ClassInfo;
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() {
return super.getOperandAsField();
}
@Override
public void execute(StackFrame frame, ExecutionResult result) {
FieldRefInfo fieldRefInfo = (FieldRefInfo) this.getConstantInfo(this.getIndex());
ClassInfo classInfo = (ClassInfo) this.getConstantInfo(fieldRefInfo.getClassInfoIndex());
NameAndTypeInfo nameAndTypeInfo = (NameAndTypeInfo) this.getConstantInfo(fieldRefInfo.getNameAndTypeIndex());
String fieldName = nameAndTypeInfo.getName();
String fieldTye = nameAndTypeInfo.getTypeInfo();
JavaObject fieldValue = frame.getOprandStack().pop();
JavaObject objectRef = frame.getOprandStack().pop();
objectRef.setFieldValue(fieldName, fieldValue);
}
}