private DemangledDataType createLiteral(String datatype) {

		// literal cases handled: -1, -1l, -1ul
		char lastChar = datatype.charAt(datatype.length() - 1);
		if (lastChar == 'l') {
			return new DemangledDataType(mangledSource, demangledSource, "long");
		}

		return new DemangledDataType(mangledSource, demangledSource, "int");
	}
This method converts each parameter string into
actual DemangledDataType objects.
Ghidra/Features/GnuDemangler/src/main/java/ghidra/app/util/demangler/gnu/GnuDemanglerParser.java