Slotify

buildstream/_loader/loadelement.py

@@ -41,7 +41,7 @@ from .types import Symbol, Dependency
 #    name (str): The element name
 #    loader (Loader): The Loader object for this element
 #
-class LoadElement():
+class LoadElement:
     # Dependency():
     #
     # A link from a LoadElement to its dependencies.
@@ -53,10 +53,14 @@ class LoadElement():
     #    element (LoadElement): a LoadElement on which there is a dependency
     #    dep_type (str): the type of dependency this dependency link is
     class _Dependency:
+        __slots__ = ["element", "dep_type"]
+
         def __init__(self, element, dep_type):
             self.element = element
             self.dep_type = dep_type
 
+    __slots__ = ["node", "name", "full_name", "node_id", "deps_id", "dependencies", "_loader"]
+
     next_id = 0b1
 
     def __init__(self, node, filename, loader):
@@ -66,8 +70,6 @@ class LoadElement():
         #
         self.node = node       # The YAML node
         self.name = filename   # The element name
-        self.full_name = None  # The element full name (with associated junction)
-        self.deps = None       # The list of Dependency objects
         self.node_id = self.get_id()
         self.deps_id = 0b0
 
@@ -75,7 +77,6 @@ class LoadElement():
         # Private members
         #
         self._loader = loader   # The Loader object
-        self._dep_cache = None  # The dependency cache, to speed up depends()
 
         #
         # Initialization