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overridable validate_downcastable_from by youknowone · Pull Request #6393 · RustPython/RustPython · GitHub

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overridable validate_downcastable_from #6393

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Merged
youknowone merged 1 commit into from
Dec 10, 2025
Conversation 1 Commits 1 Checks 12 Files changed
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overridable validate_downcastable_from #6393

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8 changes: 1 addition & 7 deletions crates/vm/src/builtins/builtin_func.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -148,7 +148,7 @@ impl Representable for PyNativeFunction {
impl Unconstructible for PyNativeFunction {}

// `PyCMethodObject` in CPython
#[pyclass(name = "builtin_method", module = false, base = PyNativeFunction)]
#[pyclass(name = "builtin_method", module = false, base = PyNativeFunction, ctx = "builtin_method_type")]
pub struct PyNativeMethod {
pub(crate) func: PyNativeFunction,
pub(crate) class: &'static Py<PyType>, // TODO: the actual life is &'self
Expand Down Expand Up @@ -189,12 +189,6 @@ impl PyNativeMethod {
}
}

impl PyPayload for PyNativeMethod {
fn class(ctx: &Context) -> &'static Py<PyType> {
ctx.types.builtin_method_type
}
}

impl fmt::Debug for PyNativeMethod {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
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10 changes: 4 additions & 6 deletions crates/vm/src/builtins/str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1932,12 +1932,10 @@ impl PyPayload for PyUtf8Str {
std::any::TypeId::of::<PyStr>()
}

fn downcastable_from(obj: &PyObject) -> bool {
obj.typeid() == Self::payload_type_id() && {
// SAFETY: we know the object is a PyStr in this context
let wtf8 = unsafe { obj.downcast_unchecked_ref::<PyStr>() };
wtf8.is_utf8()
}
fn validate_downcastable_from(obj: &PyObject) -> bool {
// SAFETY: we know the object is a PyStr in this context
let wtf8 = unsafe { obj.downcast_unchecked_ref::<PyStr>() };
wtf8.is_utf8()
}

fn try_downcast_from(obj: &PyObject, vm: &VirtualMachine) -> PyResult<()> {
Expand Down
7 changes: 6 additions & 1 deletion crates/vm/src/object/payload.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,12 @@ pub trait PyPayload: MaybeTraverse + PyThreadingConstraint + Sized + 'static {
/// # Safety: this function should only be called if `payload_type_id` matches the type of `obj`.
#[inline]
fn downcastable_from(obj: &PyObject) -> bool {
obj.typeid() == Self::payload_type_id()
obj.typeid() == Self::payload_type_id() && Self::validate_downcastable_from(obj)
}

#[inline]
fn validate_downcastable_from(_obj: &PyObject) -> bool {
true
}

fn try_downcast_from(obj: &PyObject, vm: &VirtualMachine) -> PyResult<()> {
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