Rework some call signature issues

jedi/evaluate/__init__.py

@@ -323,12 +323,8 @@ class Evaluator(object):
                         context_set = eval_trailer(context, context_set, trailer)
                 param_names = []
                 for context in context_set:
-                    try:
-                        get_param_names = context.get_param_names
-                    except AttributeError:
-                        pass
-                    else:
-                        for param_name in get_param_names():
+                    for signature in context.get_signatures():
+                        for param_name in signature.get_param_names():
                             if param_name.string_name == name.value:
                                 param_names.append(param_name)
                 return param_names

jedi/evaluate/base_context.py

@@ -356,6 +356,9 @@ class ContextSet(BaseContextSet):
                 context_set |= method()
         return context_set
 
+    def get_signatures(self):
+        return [sig for c in self._set for sig in c.get_signatures()]
+
 
 NO_CONTEXTS = ContextSet([])
 

jedi/evaluate/context/instance.py

@@ -218,6 +218,10 @@ class AbstractInstanceContext(Context):
                 raise NotImplementedError
         return class_context
 
+    def get_signatures(self):
+        init_funcs = self.py__getattribute__('__call__')
+        return [sig.bind() for sig in init_funcs.get_signatures()]
+
     def __repr__(self):
         return "<%s of %s(%s)>" % (self.__class__.__name__, self.class_context,
                                    self.var_args)
@@ -296,12 +300,14 @@ class TreeInstance(AbstractInstanceContext):
         return self._get_annotated_class_object() or self.class_context
 
     def _get_annotation_init_functions(self):
-        for init in self.class_context.py__getattribute__('__init__'):
-            if isinstance(init, OverloadedFunctionContext):
-                for func in init.overloaded_functions:
-                    yield func
-            elif isinstance(init, FunctionContext):
-                yield init
+        filter = next(self.class_context.get_filters())
+        for init_name in filter.get('__init__'):
+            for init in init_name.infer():
+                if isinstance(init, OverloadedFunctionContext):
+                    for func in init.overloaded_functions:
+                        yield func
+                elif isinstance(init, FunctionContext):
+                    yield init
 
 
 class AnonymousInstance(TreeInstance):

jedi/evaluate/context/klass.py

@@ -292,6 +292,4 @@ class ClassContext(use_metaclass(CachedMetaClass, ClassMixin, TreeContext)):
 
     def get_signatures(self):
         init_funcs = self.py__getattribute__('__init__')
-        return [
-            s for f in init_funcs for s in f.get_signatures()
-        ]
+        return [sig.bind() for sig in init_funcs.get_signatures()]