public int getDFASize() {
		int n = 0;
		DFA[] decisionToDFA = atnSimulator.decisionToDFA;
		for (int i = 0; i < decisionToDFA.length; i++) {
			n += getDFASize(i);
		}
		return n;
	}
Gets the total number of DFA states stored in the DFA cache for all
decisions in the ATN.
runtime/Java/src/org/antlr/v4/runtime/atn/ParseInfo.java