modules: Stop using InterpreterObject

Custom objects returned by modules must be subclass of ModuleObject and
have the state argument in its methods.

Add MutableModuleObject base class for objects that needs to be deep
copied on assignation.

1 files changed, 7 insertions, 0 deletions

diff --git a/mesonbuild/interpreter/interpreterobjects.py b/mesonbuild/interpreter/interpreterobjects.py
index 1c64f5b..3f76e4e 100644
--- a/mesonbuild/interpreter/interpreterobjects.py
+++ b/mesonbuild/interpreter/interpreterobjects.py
@@ -2,6 +2,7 @@ import os
 import shlex
 import subprocess
 import re
+import copy
 
 from pathlib import Path, PurePath
 
@@ -810,6 +811,12 @@ class ModuleObjectHolder(InterpreterObject, ObjectHolder['ModuleObject']):
             ret = ret.return_value
         return self.interpreter.holderify(ret)
 
+class MutableModuleObjectHolder(ModuleObjectHolder, MutableInterpreterObject):
+    def __deepcopy__(self, memo):
+        # Deepcopy only held object, not interpreter
+        modobj = copy.deepcopy(self.held_object, memo)
+        return MutableModuleObjectHolder(modobj, self.interpreter)
+
 _Target = T.TypeVar('_Target', bound=build.Target)