read_liberty: Set area capacitance attributes

frontends/liberty/liberty.cc

@@ -571,6 +571,10 @@ struct LibertyFrontend : public Frontend {
 			if (flag_wb)
 				module->set_bool_attribute(ID::whitebox);
 
+			const LibertyAst *area = cell->find("area");
+			if (area)
+				module->attributes[ID::area] = area->value;
+
 			for (auto &attr : attributes)
 				module->attributes[attr] = 1;
 
@@ -662,6 +666,10 @@ struct LibertyFrontend : public Frontend {
 					RTLIL::Wire *wire = module->wires_.at(RTLIL::escape_id(node->args.at(0)));
 					log_assert(wire);
 
+					const LibertyAst *capacitance = node->find("capacitance");
+					if (capacitance)
+						wire->attributes[ID::capacitance] = capacitance->value;
+
 					if (dir && dir->value == "inout") {
 						wire->port_input = true;
 						wire->port_output = true;

kernel/constids.inc

@@ -274,3 +274,5 @@ X(X)
 X(xprop_decoder)
 X(Y)
 X(Y_WIDTH)
+X(area)
+X(capacitance)