@Override
	public int getParameterOffset() {
		Integer baseOffset = VariableUtilities.getBaseStackParamOffset(function);
		return baseOffset != null ? (int) baseOffset.longValue() : UNKNOWN_PARAM_OFFSET;
	}
@return the number of parameters which occupy stack storage
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/function/FunctionStackFrame.java