autorouter: store layer to layer names map in `Board`

src/autorouter/board.rs

@@ -23,6 +23,7 @@ pub type NodeIndex = GenericNode<PrimitiveIndex, GenericIndex<ZoneWeight>>;
 pub struct Board<R: RulesTrait> {
     layout: Layout<R>,
     node_to_pin: HashMap<NodeIndex, String>,
+    layer_to_layername: HashMap<u64, String>,
     net_to_netname: HashMap<usize, String>,
 }
 
@@ -31,6 +32,7 @@ impl<R: RulesTrait> Board<R> {
         Self {
             layout,
             node_to_pin: HashMap::new(),
+            layer_to_layername: HashMap::new(),
             net_to_netname: HashMap::new(),
         }
     }
@@ -114,6 +116,10 @@ impl<R: RulesTrait> Board<R> {
         zone
     }
 
+    pub fn bename_layer(&mut self, layer: u64, layername: String) {
+        self.layer_to_layername.insert(layer, layername);
+    }
+
     pub fn bename_net(&mut self, net: usize, netname: String) {
         self.net_to_netname.insert(net, netname);
     }

src/dsn/design.rs

@@ -323,7 +323,14 @@ impl DsnDesign {
             );
         }
 
-        // The clone here is bad, we'll have something better later on.
+        // The clones here are bad, we'll have something better later on.
+
+        let layername_to_layer = &board.layout().drawing().rules().layername_to_layer.clone();
+
+        for (layername, layer) in layername_to_layer.iter() {
+            board.bename_layer(*layer, layername.to_string());
+        }
+
         let netname_to_net = &board.layout().drawing().rules().netname_to_net.clone();
 
         for (netname, net) in netname_to_net.iter() {