regz: generate enums attached to parent

tools/regz/src/Database.zig

@@ -1347,7 +1347,42 @@ pub fn get_enum_by_name(
     return db.one_alloc(Enum, allocator, query, .{
         .struct_id = struct_id,
         .name = name,
+    }) catch |err| switch (err) {
+        error.MissingEntity => {
+            // lookup the enum among the parents
+            var parent_id = struct_id;
+            var i: u8 = 0;
+            const max_depth = 10;
+            while (i <= max_depth) : (i += 1) {
+                parent_id = db.get_parent_struct_id(parent_id) catch {
+                    return err;
+                };
+
+                log.debug("get_enum_by_name: parent_id={} name='{s}'", .{ parent_id, name });
+                return db.one_alloc(Enum, allocator, query, .{
+                    .struct_id = parent_id,
+                    .name = name,
+                }) catch {
+                    continue;
+                };
+            }
+            return err;
+        },
+        else => {
+            return err;
+        },
+    };
+}
+
+fn get_parent_struct_id(db: *Database, struct_id: StructID) !StructID {
+    var stmt = try db.sql.prepare("SELECT parent_id FROM struct_decls WHERE struct_id = ?");
+    defer stmt.deinit();
+
+    const row = try stmt.one(StructID, .{}, .{
+        .struct_id = struct_id,
     });
+
+    return if (row) |parent_id| parent_id else error.MissingEntity;
 }
 
 fn one_alloc(

tools/regz/src/atdf.zig

@@ -676,7 +676,10 @@ fn load_field(ctx: *Context, node: xml.Node, peripheral_struct_id: StructID, par
                     .size_bits = 1,
                     .offset_bits = i,
                     .enum_id = if (node.get_attribute("values")) |values| blk: {
-                        const e = try db.get_enum_by_name(arena, peripheral_struct_id, values);
+                        const e = db.get_enum_by_name(arena, peripheral_struct_id, values) catch |err| {
+                            log.warn("{s} failed to get_enum_by_name: {s}", .{ name, values });
+                            return err;
+                        };
                         break :blk e.id;
                     } else null,
                 });
@@ -722,7 +725,10 @@ fn load_field(ctx: *Context, node: xml.Node, peripheral_struct_id: StructID, par
             .size_bits = width,
             .offset_bits = offset,
             .enum_id = if (node.get_attribute("values")) |values| blk: {
-                const e = try db.get_enum_by_name(arena, peripheral_struct_id, values);
+                const e = db.get_enum_by_name(arena, peripheral_struct_id, values) catch |err| {
+                    log.warn("{s} failed to get_enum_by_name: {s}", .{ name, values });
+                    return err;
+                };
                 break :blk e.id;
             } else null,
         });