Mark abstract and non-abstract Handle types

cocotb/handle.py

@@ -32,6 +32,7 @@
 import ctypes
 import warnings
 import enum
+from abc import ABC, abstractmethod
 from functools import lru_cache
 from typing import Optional
 
@@ -68,7 +69,7 @@ def _value_limits(n_bits, limits):
     return min_val, max_val
 
 
-class SimHandleBase:
+class SimHandleBase(ABC):
     """Base class for all simulation objects.
 
     We maintain a handle which we can use for GPI calls.
@@ -84,6 +85,7 @@ class SimHandleBase:
         "name"              :       "_name",
     }
 
+    @abstractmethod
     def __init__(self, handle, path):
         """
         .. Constructor. This RST comment works around sphinx-doc/sphinx#6885
@@ -213,6 +215,7 @@ class RegionObject(SimHandleBase):
     Region objects don't have values, they are effectively scopes or namespaces.
     """
 
+    @abstractmethod
     def __init__(self, handle, path):
         SimHandleBase.__init__(self, handle, path)
         self._discovered = False  # True if this object has already been discovered
@@ -280,6 +283,9 @@ def __dir__(self):
 class HierarchyObject(RegionObject):
     """Hierarchy objects are namespace/scope objects."""
 
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def __get_sub_handle_by_name(self, name):
         try:
             return self._sub_handles[name]
@@ -368,6 +374,9 @@ def _id(self, name, extended: bool = True):
 class HierarchyArrayObject(RegionObject):
     """Hierarchy Arrays are containers of Hierarchy Objects."""
 
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def _sub_handle_key(self, name):
         """Translate the handle name to a key to use in :any:`_sub_handles` dictionary."""
         # This is slightly hacky, but we need to extract the index from the name
@@ -439,6 +448,10 @@ def __bool__(self):
 class NonHierarchyObject(SimHandleBase):
     """Common base class for all non-hierarchy objects."""
 
+    @abstractmethod
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def __iter__(self):
         return iter(())
 
@@ -661,6 +674,7 @@ def _as_gpi_args_for(self, hdl):
 class ModifiableObject(NonHierarchyObject):
     """Base class for simulator objects whose values can be modified."""
 
+    @abstractmethod
     def __init__(self, handle, path):
         super().__init__(handle, path)
         self._range = self._handle.get_range()
@@ -745,6 +759,9 @@ def __str__(self):
 class LogicObject(ModifiableObject):
     """Specific object handle for Verilog nets and regs and VHDL std_logic and std_logic_vectors"""
 
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def _set_value(self, value, call_sim):
         """Set the value of the underlying simulation object to *value*.
 
@@ -842,6 +859,9 @@ def __int__(self):
 class RealObject(ModifiableObject):
     """Specific object handle for Real signals and variables."""
 
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def _set_value(self, value, call_sim):
         """Set the value of the underlying simulation object to value.
 
@@ -898,6 +918,9 @@ def __setitem__(self, item):
 class EnumObject(ModifiableObject):
     """Specific object handle for enumeration signals and variables."""
 
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def _set_value(self, value, call_sim):
         """Set the value of the underlying simulation object to *value*.
 
@@ -957,6 +980,9 @@ def __setitem__(self, item):
 class IntegerObject(ModifiableObject):
     """Specific object handle for integer and enumeration signals and variables."""
 
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def _set_value(self, value, call_sim):
         """Set the value of the underlying simulation object to *value*.
 
@@ -1019,6 +1045,9 @@ def __setitem__(self, item):
 class StringObject(ModifiableObject):
     """Specific object handle for String variables."""
 
+    def __init__(self, handle, path):
+        super().__init__(handle, path)
+
     def _set_value(self, value, call_sim):
         """Set the value of the underlying simulation object to *value*.