remove Scopes LRU caching

capa/helpers.py

@@ -132,25 +132,6 @@ def redirecting_print_to_tqdm(disable_progress):
         inspect.builtins.print = old_print  # type: ignore
 
 
-def weak_lru(maxsize=128, typed=False):
-    """
-    LRU Cache decorator that keeps a weak reference to 'self'
-    """
-
-    def wrapper(func):
-        @functools.lru_cache(maxsize, typed)
-        def _func(_self, *args, **kwargs):
-            return func(_self(), *args, **kwargs)
-
-        @functools.wraps(func)
-        def inner(self, *args, **kwargs):
-            return _func(weakref.ref(self), *args, **kwargs)
-
-        return inner
-
-    return wrapper
-
-
 def log_unsupported_format_error():
     logger.error("-" * 80)
     logger.error(" Input file does not appear to be a PE or ELF file.")

capa/rules/__init__.py

@@ -16,7 +16,7 @@ import collections
 from enum import Enum
 from pathlib import Path
 
-from capa.helpers import weak_lru, assert_never
+from capa.helpers import assert_never
 
 try:
     from functools import lru_cache
@@ -115,10 +115,6 @@ class Scopes:
     static: Optional[str] = None
     dynamic: Optional[str] = None
 
-    @weak_lru()
-    def __new__(cls, *args, **kwargs):
-        return super().__new__(cls)
-
     def __contains__(self, scope: Union[Scope, str]) -> bool:
         assert isinstance(scope, (Scope, str))
         return (scope == self.static) or (scope == self.dynamic)