public PredictionContextCache getSharedContextCache() {
		return sharedContextCache;
	}
Clear the DFA cache used by the current instance. Since the DFA cache may
be shared by multiple ATN simulators, this method may affect the
performance (but not accuracy) of other parsers which are being used
concurrently.

@throws UnsupportedOperationException if the current instance does not
support clearing the DFA.

@since 4.3
runtime/Java/src/org/antlr/v4/runtime/atn/ATNSimulator.java