From 8abf2daf4ec41861824b53f6cf0db6671ec76adc Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Sun, 29 Jun 2025 05:12:21 +0900
Subject: [PATCH 1/6] check_exact

---
 vm/src/builtins/type.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/vm/src/builtins/type.rs b/vm/src/builtins/type.rs
index 94c4f2f668..c28b4f593b 100644
--- a/vm/src/builtins/type.rs
+++ b/vm/src/builtins/type.rs
@@ -439,6 +439,12 @@ impl PyType {
 }
 
 impl Py<PyType> {
+    /// Equivalent to CPython's PyType_CheckExact macro
+    /// Checks if obj is exactly a type (not a subclass)
+    pub fn check_exact<'a>(obj: &'a PyObject, vm: &VirtualMachine) -> Option<&'a Py<PyType>> {
+        obj.downcast_ref_if_exact::<PyType>(vm)
+    }
+
     /// Determines if `subclass` is actually a subclass of `cls`, this doesn't call __subclasscheck__,
     /// so only use this if `cls` is known to have not overridden the base __subclasscheck__ magic
     /// method.

From 7a92989357b6363abfa078fa39e7191753297317 Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Sun, 29 Jun 2025 04:52:23 +0900
Subject: [PATCH 2/6] check_class

---
 vm/src/protocol/object.rs | 48 ++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 13 deletions(-)

diff --git a/vm/src/protocol/object.rs b/vm/src/protocol/object.rs
index 804918abb3..4e4b7a22cd 100644
--- a/vm/src/protocol/object.rs
+++ b/vm/src/protocol/object.rs
@@ -371,20 +371,42 @@ impl PyObject {
         })
     }
 
-    // Equivalent to check_class. Masks Attribute errors (into TypeErrors) and lets everything
-    // else go through.
-    fn check_cls<F>(&self, cls: &PyObject, vm: &VirtualMachine, msg: F) -> PyResult
+    // Equivalent to CPython's check_class. Returns Ok(()) if cls is a valid class,
+    // Err with TypeError if not. Uses abstract_get_bases internally.
+    fn check_class<F>(&self, vm: &VirtualMachine, msg: F) -> PyResult<()>
     where
         F: Fn() -> String,
     {
-        cls.get_attr(identifier!(vm, __bases__), vm).map_err(|e| {
-            // Only mask AttributeErrors.
-            if e.class().is(vm.ctx.exceptions.attribute_error) {
-                vm.new_type_error(msg())
-            } else {
-                e
+        let cls = self;
+        match cls.abstract_get_bases(vm)? {
+            Some(_bases) => Ok(()), // Has __bases__, it's a valid class
+            None => {
+                // No __bases__ or __bases__ is not a tuple
+                Err(vm.new_type_error(msg()))
             }
-        })
+        }
+    }
+
+    /// abstract_get_bases() has logically 4 return states:
+    /// 1. getattr(cls, '__bases__') could raise an AttributeError
+    /// 2. getattr(cls, '__bases__') could raise some other exception
+    /// 3. getattr(cls, '__bases__') could return a tuple
+    /// 4. getattr(cls, '__bases__') could return something other than a tuple
+    ///
+    /// Only state #3 returns Some(tuple). AttributeErrors are masked by returning None.
+    /// If an object other than a tuple comes out of __bases__, then again, None is returned.
+    /// Other exceptions are propagated.
+    fn abstract_get_bases(&self, vm: &VirtualMachine) -> PyResult<Option<PyTupleRef>> {
+        match vm.get_attribute_opt(self.to_owned(), identifier!(vm, __bases__))? {
+            Some(bases) => {
+                // Check if it's a tuple
+                match PyTupleRef::try_from_object(vm, bases) {
+                    Ok(tuple) => Ok(Some(tuple)),
+                    Err(_) => Ok(None), // Not a tuple, return None
+                }
+            }
+            None => Ok(None), // AttributeError was masked
+        }
     }
 
     fn abstract_issubclass(&self, cls: &PyObject, vm: &VirtualMachine) -> PyResult<bool> {
@@ -429,13 +451,13 @@ impl PyObject {
             Ok(obj.fast_issubclass(cls))
         } else {
             // Check if derived is a class
-            self.check_cls(self, vm, || {
+            self.check_class(vm, || {
                 format!("issubclass() arg 1 must be a class, not {}", self.class())
             })?;
 
             // Check if cls is a class, tuple, or union
             if !cls.class().is(vm.ctx.types.union_type) {
-                self.check_cls(cls, vm, || {
+                cls.check_class(vm, || {
                     format!(
                         "issubclass() arg 2 must be a class, a tuple of classes, or a union, not {}",
                         cls.class()
@@ -520,7 +542,7 @@ impl PyObject {
             Ok(retval)
         } else {
             // Not a type object, check if it's a valid class
-            self.check_cls(cls, vm, || {
+            cls.check_class(vm, || {
                 format!(
                     "isinstance() arg 2 must be a type, a tuple of types, or a union, not {}",
                     cls.class()

From 886920b22d1d40eff0f46ec2426d274c04ef217e Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Sun, 29 Jun 2025 05:00:01 +0900
Subject: [PATCH 3/6] Type compatibility tools

---
 vm/src/builtins/type.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/vm/src/builtins/type.rs b/vm/src/builtins/type.rs
index c28b4f593b..c606b3d1a3 100644
--- a/vm/src/builtins/type.rs
+++ b/vm/src/builtins/type.rs
@@ -158,6 +158,15 @@ fn downcast_qualname(value: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyRef<
     }
 }
 
+fn is_subtype_with_mro(a_mro: &[PyTypeRef], _a: &Py<PyType>, b: &Py<PyType>) -> bool {
+    for item in a_mro {
+        if item.is(b) {
+            return true;
+        }
+    }
+    false
+}
+
 impl PyType {
     pub fn new_simple_heap(
         name: &str,
@@ -197,6 +206,12 @@ impl PyType {
         Self::new_heap_inner(base, bases, attrs, slots, heaptype_ext, metaclass, ctx)
     }
 
+    /// Equivalent to CPython's PyType_Check macro
+    /// Checks if obj is an instance of type (or its subclass)
+    pub(crate) fn check(obj: &PyObject) -> Option<&Py<Self>> {
+        obj.downcast_ref::<Self>()
+    }
+
     fn resolve_mro(bases: &[PyRef<Self>]) -> Result<Vec<PyTypeRef>, String> {
         // Check for duplicates in bases.
         let mut unique_bases = HashSet::new();
@@ -439,6 +454,10 @@ impl PyType {
 }
 
 impl Py<PyType> {
+    pub(crate) fn is_subtype(&self, other: &Py<PyType>) -> bool {
+        is_subtype_with_mro(&self.mro.read(), self, other)
+    }
+
     /// Equivalent to CPython's PyType_CheckExact macro
     /// Checks if obj is exactly a type (not a subclass)
     pub fn check_exact<'a>(obj: &'a PyObject, vm: &VirtualMachine) -> Option<&'a Py<PyType>> {

From f1ccda49f842434aaca26789a8230bea784e256c Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Sun, 29 Jun 2025 11:32:46 +0900
Subject: [PATCH 4/6] abstract_issubclass

---
 vm/src/protocol/object.rs | 50 +++++++++++++++++++++++----------------
 1 file changed, 30 insertions(+), 20 deletions(-)

diff --git a/vm/src/protocol/object.rs b/vm/src/protocol/object.rs
index 4e4b7a22cd..0c2d4c3c86 100644
--- a/vm/src/protocol/object.rs
+++ b/vm/src/protocol/object.rs
@@ -411,39 +411,49 @@ impl PyObject {
 
     fn abstract_issubclass(&self, cls: &PyObject, vm: &VirtualMachine) -> PyResult<bool> {
         let mut derived = self;
-        let mut first_item: PyObjectRef;
-        loop {
+
+        // First loop: handle single inheritance without recursion
+        let bases = loop {
             if derived.is(cls) {
                 return Ok(true);
             }
 
-            let bases = derived.get_attr(identifier!(vm, __bases__), vm)?;
-            let tuple = PyTupleRef::try_from_object(vm, bases)?;
-
-            let n = tuple.len();
+            let Some(bases) = derived.abstract_get_bases(vm)? else {
+                return Ok(false);
+            };
+            let n = bases.len();
             match n {
-                0 => {
-                    return Ok(false);
-                }
+                0 => return Ok(false),
                 1 => {
-                    first_item = tuple[0].clone();
-                    derived = &first_item;
+                    // Avoid recursion in the single inheritance case
+                    // # safety
+                    // Intention: bases.as_slice()[0].as_object();
+                    // Though type-system cannot guarantee, derived does live long enough in the loop.
+                    derived = unsafe { &*(bases.as_slice()[0].as_object() as *const _) };
                     continue;
                 }
                 _ => {
-                    for i in 0..n {
-                        let check = vm.with_recursion("in abstract_issubclass", || {
-                            tuple[i].abstract_issubclass(cls, vm)
-                        })?;
-                        if check {
-                            return Ok(true);
-                        }
-                    }
+                    // Multiple inheritance - break out to handle recursively
+                    break bases;
                 }
             }
+        };
 
-            return Ok(false);
+        // Second loop: handle multiple inheritance with recursion
+        // At this point we know n >= 2
+        let n = bases.len();
+        assert!(n >= 2);
+
+        for i in 0..n {
+            let result = vm.with_recursion("in __issubclass__", || {
+                bases.as_slice()[i].abstract_issubclass(cls, vm)
+            })?;
+            if result {
+                return Ok(true);
+            }
         }
+
+        Ok(false)
     }
 
     fn recursive_issubclass(&self, cls: &PyObject, vm: &VirtualMachine) -> PyResult<bool> {

From 6cf5c50a73eaf56c82b0a85ad37316c95c0867e8 Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Sun, 29 Jun 2025 11:33:07 +0900
Subject: [PATCH 5/6] recursive_issubclass

---
 vm/src/protocol/object.rs | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/vm/src/protocol/object.rs b/vm/src/protocol/object.rs
index 0c2d4c3c86..86d2b33fe7 100644
--- a/vm/src/protocol/object.rs
+++ b/vm/src/protocol/object.rs
@@ -457,26 +457,26 @@ impl PyObject {
     }
 
     fn recursive_issubclass(&self, cls: &PyObject, vm: &VirtualMachine) -> PyResult<bool> {
-        if let (Ok(obj), Ok(cls)) = (self.try_to_ref::<PyType>(vm), cls.try_to_ref::<PyType>(vm)) {
-            Ok(obj.fast_issubclass(cls))
-        } else {
-            // Check if derived is a class
-            self.check_class(vm, || {
-                format!("issubclass() arg 1 must be a class, not {}", self.class())
-            })?;
-
-            // Check if cls is a class, tuple, or union
-            if !cls.class().is(vm.ctx.types.union_type) {
-                cls.check_class(vm, || {
-                    format!(
-                        "issubclass() arg 2 must be a class, a tuple of classes, or a union, not {}",
-                        cls.class()
-                    )
-                })?;
-            }
+        // Fast path for both being types (matches CPython's PyType_Check)
+        if let Some(cls) = PyType::check(cls)
+            && let Some(derived) = PyType::check(self)
+        {
+            // PyType_IsSubtype equivalent
+            return Ok(derived.is_subtype(cls));
+        }
+        // Check if derived is a class
+        self.check_class(vm, || {
+            format!("issubclass() arg 1 must be a class, not {}", self.class())
+        })?;
 
-            self.abstract_issubclass(cls, vm)
+        // Check if cls is a class, tuple, or union (matches CPython's order and message)
+        if !cls.class().is(vm.ctx.types.union_type) {
+            cls.check_class(vm, || {
+                "issubclass() arg 2 must be a class, a tuple of classes, or a union".to_string()
+            })?;
         }
+
+        self.abstract_issubclass(cls, vm)
     }
 
     /// Real issubclass check without going through __subclasscheck__

From 672e9a4f874b1c884c1a1db43784c13dc25f9c12 Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Sun, 29 Jun 2025 12:02:46 +0900
Subject: [PATCH 6/6] Fix mro representation to contain self

---
 vm/src/builtins/tuple.rs |  4 ++--
 vm/src/builtins/type.rs  | 43 ++++++++++++++++++----------------------
 vm/src/frame.rs          |  2 +-
 vm/src/object/core.rs    |  5 ++++-
 vm/src/vm/mod.rs         |  2 +-
 5 files changed, 27 insertions(+), 29 deletions(-)

diff --git a/vm/src/builtins/tuple.rs b/vm/src/builtins/tuple.rs
index 7f3855c529..dfe545488b 100644
--- a/vm/src/builtins/tuple.rs
+++ b/vm/src/builtins/tuple.rs
@@ -537,9 +537,9 @@ impl<T: TransmuteFromObject> AsRef<[T]> for PyTupleTyped<T> {
 }
 
 impl<T: TransmuteFromObject> PyTupleTyped<T> {
-    pub fn empty(vm: &VirtualMachine) -> Self {
+    pub fn empty(ctx: &Context) -> Self {
         Self {
-            tuple: vm.ctx.empty_tuple.clone(),
+            tuple: ctx.empty_tuple.clone(),
             _marker: PhantomData,
         }
     }
diff --git a/vm/src/builtins/type.rs b/vm/src/builtins/type.rs
index c606b3d1a3..c5792c6b2d 100644
--- a/vm/src/builtins/type.rs
+++ b/vm/src/builtins/type.rs
@@ -37,7 +37,7 @@ use std::{borrow::Borrow, collections::HashSet, ops::Deref, pin::Pin, ptr::NonNu
 pub struct PyType {
     pub base: Option<PyTypeRef>,
     pub bases: PyRwLock<Vec<PyTypeRef>>,
-    pub mro: PyRwLock<Vec<PyTypeRef>>,
+    pub mro: PyRwLock<Vec<PyTypeRef>>, // TODO: PyTypedTuple<PyTypeRef>
     pub subclasses: PyRwLock<Vec<PyRef<PyWeak>>>,
     pub attributes: PyRwLock<PyAttributes>,
     pub slots: PyTypeSlots,
@@ -48,7 +48,7 @@ unsafe impl crate::object::Traverse for PyType {
     fn traverse(&self, tracer_fn: &mut crate::object::TraverseFn<'_>) {
         self.base.traverse(tracer_fn);
         self.bases.traverse(tracer_fn);
-        self.mro.traverse(tracer_fn);
+        // self.mro.traverse(tracer_fn);
         self.subclasses.traverse(tracer_fn);
         self.attributes
             .read_recursive()
@@ -238,8 +238,6 @@ impl PyType {
         metaclass: PyRef<Self>,
         ctx: &Context,
     ) -> Result<PyRef<Self>, String> {
-        let mro = Self::resolve_mro(&bases)?;
-
         if base.slots.flags.has_feature(PyTypeFlags::HAS_DICT) {
             slots.flags |= PyTypeFlags::HAS_DICT
         }
@@ -256,6 +254,7 @@ impl PyType {
             }
         }
 
+        let mro = Self::resolve_mro(&bases)?;
         let new_type = PyRef::new_ref(
             PyType {
                 base: Some(base),
@@ -269,6 +268,7 @@ impl PyType {
             metaclass,
             None,
         );
+        new_type.mro.write().insert(0, new_type.clone());
 
         new_type.init_slots(ctx);
 
@@ -300,7 +300,6 @@ impl PyType {
 
         let bases = PyRwLock::new(vec![base.clone()]);
         let mro = base.mro_map_collect(|x| x.to_owned());
-
         let new_type = PyRef::new_ref(
             PyType {
                 base: Some(base),
@@ -314,6 +313,7 @@ impl PyType {
             metaclass,
             None,
         );
+        new_type.mro.write().insert(0, new_type.clone());
 
         let weakref_type = super::PyWeak::static_type();
         for base in new_type.bases.read().iter() {
@@ -332,7 +332,7 @@ impl PyType {
         #[allow(clippy::mutable_key_type)]
         let mut slot_name_set = std::collections::HashSet::new();
 
-        for cls in self.mro.read().iter() {
+        for cls in self.mro.read()[1..].iter() {
             for &name in cls.attributes.read().keys() {
                 if name == identifier!(ctx, __new__) {
                     continue;
@@ -381,8 +381,7 @@ impl PyType {
     }
 
     pub fn get_super_attr(&self, attr_name: &'static PyStrInterned) -> Option<PyObjectRef> {
-        self.mro
-            .read()
+        self.mro.read()[1..]
             .iter()
             .find_map(|class| class.attributes.read().get(attr_name).cloned())
     }
@@ -390,9 +389,7 @@ impl PyType {
     // This is the internal has_attr implementation for fast lookup on a class.
     pub fn has_attr(&self, attr_name: &'static PyStrInterned) -> bool {
         self.attributes.read().contains_key(attr_name)
-            || self
-                .mro
-                .read()
+            || self.mro.read()[1..]
                 .iter()
                 .any(|c| c.attributes.read().contains_key(attr_name))
     }
@@ -401,10 +398,7 @@ impl PyType {
         // Gather all members here:
         let mut attributes = PyAttributes::default();
 
-        for bc in std::iter::once(self)
-            .chain(self.mro.read().iter().map(|cls| -> &PyType { cls }))
-            .rev()
-        {
+        for bc in self.mro.read().iter().map(|cls| -> &PyType { cls }).rev() {
             for (name, value) in bc.attributes.read().iter() {
                 attributes.insert(name.to_owned(), value.clone());
             }
@@ -468,22 +462,21 @@ impl Py<PyType> {
     /// so only use this if `cls` is known to have not overridden the base __subclasscheck__ magic
     /// method.
     pub fn fast_issubclass(&self, cls: &impl Borrow<PyObject>) -> bool {
-        self.as_object().is(cls.borrow()) || self.mro.read().iter().any(|c| c.is(cls.borrow()))
+        self.as_object().is(cls.borrow()) || self.mro.read()[1..].iter().any(|c| c.is(cls.borrow()))
     }
 
     pub fn mro_map_collect<F, R>(&self, f: F) -> Vec<R>
     where
         F: Fn(&Self) -> R,
     {
-        std::iter::once(self)
-            .chain(self.mro.read().iter().map(|x| x.deref()))
-            .map(f)
-            .collect()
+        self.mro.read().iter().map(|x| x.deref()).map(f).collect()
     }
 
     pub fn mro_collect(&self) -> Vec<PyRef<PyType>> {
-        std::iter::once(self)
-            .chain(self.mro.read().iter().map(|x| x.deref()))
+        self.mro
+            .read()
+            .iter()
+            .map(|x| x.deref())
             .map(|x| x.to_owned())
             .collect()
     }
@@ -497,7 +490,7 @@ impl Py<PyType> {
         if let Some(r) = f(self) {
             Some(r)
         } else {
-            self.mro.read().iter().find_map(|cls| f(cls))
+            self.mro.read()[1..].iter().find_map(|cls| f(cls))
         }
     }
 
@@ -556,8 +549,10 @@ impl PyType {
         *zelf.bases.write() = bases;
         // Recursively update the mros of this class and all subclasses
         fn update_mro_recursively(cls: &PyType, vm: &VirtualMachine) -> PyResult<()> {
-            *cls.mro.write() =
+            let mut mro =
                 PyType::resolve_mro(&cls.bases.read()).map_err(|msg| vm.new_type_error(msg))?;
+            mro.insert(0, cls.mro.read()[0].to_owned());
+            *cls.mro.write() = mro;
             for subclass in cls.subclasses.write().iter() {
                 let subclass = subclass.upgrade().unwrap();
                 let subclass: &PyType = subclass.payload().unwrap();
diff --git a/vm/src/frame.rs b/vm/src/frame.rs
index 3a02d582a1..123ed6a04f 100644
--- a/vm/src/frame.rs
+++ b/vm/src/frame.rs
@@ -1384,7 +1384,7 @@ impl ExecutingFrame<'_> {
     fn import(&mut self, vm: &VirtualMachine, module_name: Option<&Py<PyStr>>) -> PyResult<()> {
         let module_name = module_name.unwrap_or(vm.ctx.empty_str);
         let from_list = <Option<PyTupleTyped<PyStrRef>>>::try_from_object(vm, self.pop_value())?
-            .unwrap_or_else(|| PyTupleTyped::empty(vm));
+            .unwrap_or_else(|| PyTupleTyped::empty(&vm.ctx));
         let level = usize::try_from_object(vm, self.pop_value())?;
 
         let module = vm.import_from(module_name, from_list, level)?;
diff --git a/vm/src/object/core.rs b/vm/src/object/core.rs
index 253d8fda63..dca63f1192 100644
--- a/vm/src/object/core.rs
+++ b/vm/src/object/core.rs
@@ -1252,12 +1252,14 @@ pub(crate) fn init_type_hierarchy() -> (PyTypeRef, PyTypeRef, PyTypeRef) {
             ptr::write(&mut (*type_type_ptr).typ, PyAtomicRef::from(type_type));
 
             let object_type = PyTypeRef::from_raw(object_type_ptr.cast());
+            (*object_type_ptr).payload.mro = PyRwLock::new(vec![object_type.clone()]);
 
-            (*type_type_ptr).payload.mro = PyRwLock::new(vec![object_type.clone()]);
             (*type_type_ptr).payload.bases = PyRwLock::new(vec![object_type.clone()]);
             (*type_type_ptr).payload.base = Some(object_type.clone());
 
             let type_type = PyTypeRef::from_raw(type_type_ptr.cast());
+            (*type_type_ptr).payload.mro =
+                PyRwLock::new(vec![type_type.clone(), object_type.clone()]);
 
             (type_type, object_type)
         }
@@ -1273,6 +1275,7 @@ pub(crate) fn init_type_hierarchy() -> (PyTypeRef, PyTypeRef, PyTypeRef) {
         heaptype_ext: None,
     };
     let weakref_type = PyRef::new_ref(weakref_type, type_type.clone(), None);
+    weakref_type.mro.write().insert(0, weakref_type.clone());
 
     object_type.subclasses.write().push(
         type_type
diff --git a/vm/src/vm/mod.rs b/vm/src/vm/mod.rs
index 20c8161004..fd97aaabd8 100644
--- a/vm/src/vm/mod.rs
+++ b/vm/src/vm/mod.rs
@@ -580,7 +580,7 @@ impl VirtualMachine {
     #[inline]
     pub fn import<'a>(&self, module_name: impl AsPyStr<'a>, level: usize) -> PyResult {
         let module_name = module_name.as_pystr(&self.ctx);
-        let from_list = PyTupleTyped::empty(self);
+        let from_list = PyTupleTyped::empty(&self.ctx);
         self.import_inner(module_name, from_list, level)
     }
 

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