Make cypclasses inherit from ancestors in MRO order

Cython/Compiler/ParseTreeTransforms.py

@@ -2198,13 +2198,6 @@ if VALUE is not None:
         return property
 
 
-class ComputeMROTransform(CythonTransform):
-    def visit_CppClassNode(self, node):
-        if node.cypclass:
-            node.entry.type.compute_mro()
-        return node
-
-
 class CalculateQualifiedNamesTransform(EnvTransform):
     """
     Calculate and store the '__qualname__' and the global

Cython/Compiler/Pipeline.py

@@ -143,7 +143,6 @@ def create_pipeline(context, mode, exclude_classes=()):
     from .Visitor import PrintTree
     from .ParseTreeTransforms import WithTransform, NormalizeTree, PostParse, PxdPostParse
     from .ParseTreeTransforms import ForwardDeclareTypes, InjectGilHandling, AnalyseDeclarationsTransform
-    from .ParseTreeTransforms import ComputeMROTransform
     from .ParseTreeTransforms import AnalyseExpressionsTransform, FindInvalidUseOfFusedTypes
     from .ParseTreeTransforms import CreateClosureClasses, MarkClosureVisitor, DecoratorTransform
     from .ParseTreeTransforms import TrackNumpyAttributes, InterpretCompilerDirectives, TransformBuiltinMethods
@@ -198,7 +197,6 @@ def create_pipeline(context, mode, exclude_classes=()):
         ForwardDeclareTypes(context),
         InjectGilHandling(),
         AnalyseDeclarationsTransform(context),
-        ComputeMROTransform(context),
         AutoTestDictTransform(context),
         EmbedSignature(context),
         EarlyReplaceBuiltinCalls(context),  ## Necessary?

Cython/Compiler/PyrexTypes.py

@@ -4171,7 +4171,7 @@ def compute_mro_generic(cls):
 
 class CypClassType(CppClassType):
     #  lock_mode          string (tri-state: "nolock"/"checklock"/"autolock")
-    #  mro                [CppClassType] or None         The Method Resolution Order of this cypclass according to Python
+    #  _mro               [CppClassType] or None         The Method Resolution Order of this cypclass according to Python
 
     is_cyp_class = 1
 
@@ -4179,27 +4179,27 @@ class CypClassType(CppClassType):
         CppClassType.__init__(self, name, scope, cname, base_classes, templates, template_type, nogil)
         self.lock_mode = lock_mode if lock_mode else "autolock"
         self.activable = activable
-        self.mro = None
+        self._mro = None
 
-    # compute the MRO for this cypclass
-    # the mro is also computed for bases when needed
+    # Return the MRO for this cypclass
+    # Compute all the mro needed when a previous computation is not available
     # based on https://mail.python.org/pipermail/python-dev/2002-October/029176.html
-    def compute_mro(self):
-        if self.mro is not None:
-            return self.mro
+    def mro(self):
+        if self._mro is not None:
+            return self._mro
         if self.base_classes is None:
-            self.mro = [self]
-            return self.mro
+            self._mro = [self]
+            return self._mro
         inputs = [[self]]
         for base in self.base_classes:
             if base.is_cyp_class:
-                base_mro = base.compute_mro()
+                base_mro = base.mro()
             else:
                 base_mro = compute_mro_generic(base)
             inputs.append(base_mro)
         inputs.append(self.base_classes)
-        self.mro = mro_C3_merge(inputs)
-        return self.mro
+        self._mro = mro_C3_merge(inputs)
+        return self._mro
 
     def empty_declaration_code(self):
         if self._empty_declaration is None:

Cython/Compiler/Symtab.py

@@ -737,14 +737,24 @@ class Scope(object):
                     entry.already_declared_here()
 
         def declare_inherited_attributes(entry, base_classes):
-            for base_class in base_classes:
+            def examine_base(base_class):
                 if base_class is PyrexTypes.error_type or base_class is PyrexTypes.cy_object_type:
-                    continue
+                    return False
                 if base_class.scope is None:
                     error(pos, "Cannot inherit from incomplete type")
-                else:
-                    declare_inherited_attributes(entry, base_class.base_classes)
-                    entry.type.scope.declare_inherited_cpp_attributes(base_class)
+                    return False
+                return True
+
+            if cypclass:
+                for base_class in reversed(entry.type.mro()):
+                    if examine_base(base_class):
+                        entry.type.scope.declare_inherited_cyp_attributes(base_class)
+            else:
+                for base_class in base_classes:
+                    if examine_base(base_class):
+                        declare_inherited_attributes(entry, base_class.base_classes)
+                        entry.type.scope.declare_inherited_cpp_attributes(base_class)
+
         if scope:
             entry.type.set_scope(scope)
             declare_inherited_attributes(entry, base_classes)
@@ -2997,6 +3007,79 @@ class CppClassScope(Scope):
                 entry.is_inherited = 1
                 self.inherited_type_entries.append(entry)
 
+    def declare_inherited_cyp_attributes(self, base_class):
+        base_scope = base_class.scope
+        template_type = base_class
+        while getattr(template_type, 'template_type', None):
+            template_type = template_type.template_type
+        if getattr(template_type, 'templates', None):
+            base_templates = [T.name for T in template_type.templates]
+        else:
+            base_templates = ()
+        # Declare entries for all the C++ attributes of an
+        # inherited type, with cnames modified appropriately
+        # to work with this type.
+        for base_entry in base_scope.var_entries:
+                base_entry_type = base_entry.type
+                #constructor/destructor is not inherited
+                if base_entry.name == "<del>"\
+                        or base_entry.name in ("<constructor>", "<alloc>", "<active_self>", "__activate__"):
+                    continue
+                elif base_entry.name == "<init>" and not self.lookup_here("__new__"):
+                    wrapper_entry = self.declare_constructor_wrapper(base_entry_type.args, base_entry.pos,
+                                                                     defining=1, has_varargs = base_entry_type.has_varargs,
+                                                                     optional_arg_count = base_entry_type.optional_arg_count,
+                                                                     op_arg_struct = getattr(base_entry_type, 'op_arg_struct', None),
+                                                                     return_type=self.parent_type)
+                    wrapper_entry.is_inherited = 1
+                elif base_entry.name == "__new__":
+                    # Rewrite first argument for __new__
+                    alloc_type = PyrexTypes.CPtrType(PyrexTypes.CFuncType(self.parent_type, [], nogil=1))
+                    alloc_arg = PyrexTypes.CFuncTypeArg(base_entry.type.args[0].name, alloc_type,
+                                                        base_entry.type.args[0].pos, cname=base_entry.type.args[0].cname)
+                    base_entry_type = PyrexTypes.CFuncType(base_entry_type.return_type,
+                                            [alloc_arg] + base_entry_type.args[1:], nogil=1,
+                                            has_varargs=base_entry_type.has_varargs,
+                                            optional_arg_count=base_entry_type.optional_arg_count)
+                    if hasattr(base_entry.type, 'op_arg_struct'):
+                        base_entry_type.op_arg_struct = base_entry.type.op_arg_struct
+                    base_entry_type.original_alloc_type = base_entry.type.original_alloc_type
+                    if base_entry.name in self.entries:
+                        del self.entries[base_entry.name]
+                        del self.entries["<constructor>"]
+                    elif "<init>" in self.entries:
+                        del self.entries["<constructor>"]
+                    wrapper_entry = self.declare_constructor_wrapper(base_entry_type.args[1:],
+                                                                     base_entry.pos, defining=1,
+                                                                     has_varargs = base_entry_type.has_varargs,
+                                                                     optional_arg_count = base_entry_type.optional_arg_count,
+                                                                     op_arg_struct = getattr(base_entry_type, 'op_arg_struct', None),
+                                                                     return_type=base_entry_type.return_type)
+                    wrapper_entry.is_inherited = 1
+
+                entry = self.declare(base_entry.name, base_entry.cname, base_entry_type, base_entry.pos, 'extern')
+                entry.is_variable = 1
+                entry.is_inherited = 1
+                entry.is_cfunction = base_entry.is_cfunction
+                if entry.is_cfunction:
+                    entry.func_cname = base_entry.func_cname
+                self.inherited_var_entries.append(entry)
+        for base_entry in base_scope.cfunc_entries:
+            entry = self.declare_cfunction(base_entry.name, base_entry.type,
+                                           base_entry.pos, base_entry.cname,
+                                           base_entry.visibility, api=0,
+                                           modifiers=base_entry.func_modifiers,
+                                           utility_code=base_entry.utility_code,
+                                           inheriting=1)
+            entry.is_inherited = 1
+        for base_entry in base_scope.type_entries:
+            if base_entry.name not in base_templates:
+                entry = self.declare_type(base_entry.name, base_entry.type,
+                                          base_entry.pos, base_entry.cname,
+                                          base_entry.visibility, defining=0)
+                entry.is_inherited = 1
+                self.inherited_type_entries.append(entry)
+
     def specialize(self, values, type_entry):
         scope = CppClassScope(self.name, self.outer_scope)
         scope.type = type_entry