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Allow update __class__ for mutable types or module subclasses #5225

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Merged
merged 3 commits into from
Apr 14, 2024
Merged

Allow update __class__ for mutable types or module subclasses #5225

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0f371bb
Allow update `__class__` for module subclasses
moreal Apr 12, 2024
42fafcf
Set `IMMUTABLETYPE` flag for static classes
moreal Apr 13, 2024
31f1d64
Unmark fixed tests
moreal Apr 14, 2024
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4 changes: 0 additions & 4 deletions Lib/test/test_opcache.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,8 +152,6 @@ def f():
for _ in range(1025):
self.assertTrue(f())

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_metaclass_swap(self):
class OldMetaclass(type):
@property
Expand Down Expand Up @@ -411,8 +409,6 @@ def f():
for _ in range(1025):
self.assertTrue(f())

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_metaclass_swap(self):
class OldMetaclass(type):
@property
Expand Down
3 changes: 3 additions & 0 deletions derive-impl/src/pyclass.rs
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Expand Up @@ -1497,6 +1497,9 @@ fn extract_impl_attrs(attr: AttributeArgs, item: &Ident) -> Result<ExtractedImpl
.union(::rustpython_vm::types::PyTypeFlags::#ident)
});
}
flags.push(quote! {
.union(::rustpython_vm::types::PyTypeFlags::IMMUTABLETYPE)
});
} else {
bail_span!(path, "Unknown pyimpl attribute")
}
Expand Down
17 changes: 15 additions & 2 deletions vm/src/builtins/object.rs
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@@ -1,5 +1,6 @@
use super::{PyDictRef, PyList, PyStr, PyStrRef, PyType, PyTypeRef};
use crate::common::hash::PyHash;
use crate::types::PyTypeFlags;
use crate::{
class::PyClassImpl,
function::{Either, FuncArgs, PyArithmeticValue, PyComparisonValue, PySetterValue},
Expand Down Expand Up @@ -281,7 +282,18 @@ impl PyBaseObject {

#[pygetset(name = "__class__", setter)]
fn set_class(instance: PyObjectRef, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
if instance.payload_is::<PyBaseObject>() {
let both_module = instance.class().fast_issubclass(vm.ctx.types.module_type)
&& value.class().fast_issubclass(vm.ctx.types.module_type);
let both_mutable = !instance
.class()
.slots
.flags
.has_feature(PyTypeFlags::IMMUTABLETYPE)
&& !value
.downcast_ref::<PyType>()
.map(|t| t.slots.flags.has_feature(PyTypeFlags::IMMUTABLETYPE))
.unwrap_or(false);
if both_mutable || both_module {
match value.downcast::<PyType>() {
Ok(cls) => {
// FIXME(#1979) cls instances might have a payload
Expand All @@ -298,7 +310,8 @@ impl PyBaseObject {
}
} else {
Err(vm.new_type_error(
"__class__ assignment only supported for types without a payload".to_owned(),
"__class__ assignment only supported for mutable types or ModuleType subclasses"
.to_owned(),
))
}
}
Expand Down