Auto merge of #1014 - pepyakin:generate-base-names, r=fitzgen

Generate base names upon construction

As per #1012 (comment)
r? @fitzgen

src/codegen/mod.rs

@@ -1559,7 +1559,7 @@ impl CodeGenerator for CompInfo {
                 struct_layout.saw_vtable();
             }
 
-            for (i, base) in self.base_members().iter().enumerate() {
+            for base in self.base_members() {
                 // Virtual bases are already taken into account by the vtable
                 // pointer.
                 //
@@ -1577,11 +1577,7 @@ impl CodeGenerator for CompInfo {
                 }
 
                 let inner = base.ty.to_rust_ty_or_opaque(ctx, &());
-                let field_name = ctx.rust_ident(if i == 0 {
-                    "_base".into()
-                } else {
-                    format!("_base_{}", i)
-                });
+                let field_name = ctx.rust_ident(&base.field_name);
 
                 struct_layout.saw_base(base_ty);
 

src/ir/comp.rs

@@ -769,6 +769,8 @@ pub struct Base {
     pub ty: ItemId,
     /// The kind of inheritance we're doing.
     pub kind: BaseKind,
+    /// Name of the field in which this base should be stored.
+    pub field_name: String,
 }
 
 impl Base {
@@ -1155,11 +1157,16 @@ impl CompInfo {
                         BaseKind::Normal
                     };
 
+                    let field_name = match ci.base_members.len() {
+                        0 => "_base".into(),
+                        n => format!("_base_{}", n),
+                    };
                     let type_id =
                         Item::from_ty_or_ref(cur.cur_type(), cur, None, ctx);
                     ci.base_members.push(Base {
                         ty: type_id,
                         kind: kind,
+                        field_name: field_name,
                     });
                 }
                 CXCursor_Constructor |