private Structure getTypeinfoStructure(Address typeinfoAddress) {

		Data data = listing.getDataAt(typeinfoAddress);

		if (!isTypeinfoStruct(data)) {
			return null;
		}

		return (Structure) data.getBaseDataType();

	}
method to find the main vtable for the given typeinfo and if any, add the
construction ones to the passed in list

@param typeinfo
@param map
@param constructionVtables
@param numBaseRefs
@return address of main vtable for this class
@throws CancelledException
Ghidra/Features/Decompiler/ghidra_scripts/classrecovery/RTTIGccClassRecoverer.java