@Override
	public long maxValue() {
		long res = -1;
		res <<= (bitend - bitstart);
		res <<= 1;
		return ~res;
	}
A contiguous set of bits within instruction stream, interpreted
as an integer value
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/processors/sleigh/expression/TokenField.java