public function analyze()
    {
        if (!file_exists($this->_traceFile)) {
            return false;
        }
        $this->processFunctionCalls();
        unlink($this->_traceFile);
        if (file_exists($this->_traceFile . '.xt')) {
            unlink($this->_traceFile . '.xt');
        }

        if (count($this->_failures) > 0) {
            return $this->_failures;
        } else {
		    return array();
		}
    }