private void setPointerMask(Program program) {
		int ptrSize = program.getDefaultPointerSize();
		if (ptrSize > 8) {
			ptrSize = 8;
		}
		pointerSize = ptrSize;
		pointerMask = maskSize[ptrSize];
		pointerSizedDT = IntegerDataType.getUnsignedDataType(pointerSize, null);
	}
set up a pointer mask to be used when creating pointers into this memory
Ghidra/Features/Base/src/main/java/ghidra/program/util/SymbolicPropogator.java