@Override
	public FieldLocation getFieldLocation(ListingField bf, BigInteger index, int fieldNum,
			ProgramLocation programLoc) {
		if (programLoc instanceof InstructionMaskValueFieldLocation) {
			InstructionMaskValueFieldLocation maskValueLoc =
				(InstructionMaskValueFieldLocation) programLoc;
			return new FieldLocation(index, fieldNum, maskValueLoc.getRow(),
				maskValueLoc.getCharOffset());
		}
		return null;
	}
Returns the FactoryField for the given object at index index.
@param varWidth the amount of variable width spacing for any fields
before this one.
@param proxy the object whose properties should be displayed.
Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/field/InstructionMaskValueFieldFactory.java