private DataType getDataType(Varnode varnode) {
		if (varnode != null) {
			HighVariable highVariable = varnode.getHigh();
			if (highVariable != null) {
				return highVariable.getDataType();
			}
		}
		return null;
	}
A base class that represents a variable from the decompiler.  This is either a variable
type or a variable with an optional field access.
Ghidra/Features/DecompilerDependent/src/main/java/ghidra/app/extension/datatype/finder/DecompilerVariable.java