code: public void set(@IndexFor({"loc_arr", "os_arr"}) int offset, Frame f) {
  
      OperandStack os = f.getStack();
      // logger.info ("stack[" + offset + "] = " + toString(os));
  
      loc_arr[offset] = (LocalVariables) (f.getLocals().clone());
      os_arr[offset] = (OperandStack) (os.clone());
    }
docs: Sets the stack for the instruction at the specified offset to a copy of the information in the
  given frame.
  
  @param offset the offset at which the instruction appears
  @param f the stack frame to use for the instruction