tests if the stack is empty . concode_field_sep int ROOT_FRAME concode_elem_sep ArrayList<Frame> frameStack concode_field_sep Frame pop concode_elem_sep List<Frame> frames concode_elem_sep void clear concode_elem_sep Frame currentFrame concode_elem_sep ThreadStack clone concode_elem_sep Frame rootFrame concode_elem_sep String toString concode_elem_sep void push
boolean function ( ) { return this . frameStack . isEmpty ( ) ; }