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Copy pathtype.rs
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1395 lines (1247 loc) · 45 KB
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use super::{
mappingproxy::PyMappingProxy, object, union_, PyClassMethod, PyDictRef, PyList, PyStaticMethod,
PyStr, PyStrInterned, PyStrRef, PyTuple, PyTupleRef, PyWeak,
};
use crate::{
atomic_func,
builtins::{
descriptor::{
DescrObject, MemberDef, MemberDescrObject, MemberGetter, MemberKind, MemberSetter,
},
function::PyCellRef,
tuple::{IntoPyTuple, PyTupleTyped},
PyBaseExceptionRef,
},
class::{PyClassImpl, StaticType},
common::{
ascii,
borrow::BorrowedValue,
lock::{PyRwLock, PyRwLockReadGuard},
},
convert::{ToPyObject, ToPyResult},
function::{FuncArgs, KwArgs, OptionalArg, PySetterValue},
identifier,
protocol::{PyIterReturn, PyMappingMethods, PyNumberMethods, PySequenceMethods},
types::AsNumber,
types::{Callable, GetAttr, PyTypeFlags, PyTypeSlots, SetAttr},
AsObject, Context, Py, PyObjectRef, PyPayload, PyRef, PyResult, TryFromObject, VirtualMachine,
};
use indexmap::{map::Entry, IndexMap};
use itertools::Itertools;
use once_cell::sync::Lazy;
use std::{borrow::Borrow, collections::HashSet, fmt, ops::Deref, pin::Pin, ptr::NonNull};
#[pyclass(module = false, name = "type")]
pub struct PyType {
pub base: Option<PyTypeRef>,
pub bases: Vec<PyTypeRef>,
pub mro: Vec<PyTypeRef>,
pub subclasses: PyRwLock<Vec<PyRef<PyWeak>>>,
pub attributes: PyRwLock<PyAttributes>,
pub slots: PyTypeSlots,
pub heaptype_ext: Option<Pin<Box<HeapTypeExt>>>,
}
#[derive(Default)]
pub struct HeapTypeExt {
pub slots: Option<PyTupleTyped<PyStrRef>>,
pub number_methods: PyNumberMethods,
pub sequence_methods: PySequenceMethods,
pub mapping_methods: PyMappingMethods,
}
pub struct PointerSlot<T>(NonNull<T>);
impl<T> PointerSlot<T> {
pub unsafe fn borrow_static(&self) -> &'static T {
self.0.as_ref()
}
}
impl<T> Clone for PointerSlot<T> {
fn clone(&self) -> Self {
*self
}
}
impl<T> Copy for PointerSlot<T> {}
impl<T> From<&'static T> for PointerSlot<T> {
fn from(x: &'static T) -> Self {
Self(NonNull::from(x))
}
}
impl<T> AsRef<T> for PointerSlot<T> {
fn as_ref(&self) -> &T {
unsafe { self.0.as_ref() }
}
}
impl<T> PointerSlot<T> {
pub unsafe fn from_heaptype<F>(typ: &PyType, f: F) -> Option<Self>
where
F: FnOnce(&HeapTypeExt) -> &T,
{
typ.heaptype_ext
.as_ref()
.map(|ext| Self(NonNull::from(f(ext))))
}
}
pub type PyTypeRef = PyRef<PyType>;
cfg_if::cfg_if! {
if #[cfg(feature = "threading")] {
unsafe impl Send for PyType {}
unsafe impl Sync for PyType {}
}
}
/// For attributes we do not use a dict, but an IndexMap, which is an Hash Table
/// that maintains order and is compatible with the standard HashMap This is probably
/// faster and only supports strings as keys.
pub type PyAttributes = IndexMap<&'static PyStrInterned, PyObjectRef, ahash::RandomState>;
impl fmt::Display for PyType {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(&self.name(), f)
}
}
impl fmt::Debug for PyType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "[PyType {}]", &self.name())
}
}
impl PyPayload for PyType {
fn class(vm: &VirtualMachine) -> &'static Py<PyType> {
vm.ctx.types.type_type
}
}
impl PyType {
pub fn new_simple_ref(
name: &str,
base: &PyTypeRef,
ctx: &Context,
) -> Result<PyRef<Self>, String> {
Self::new_ref(
name,
vec![base.clone()],
Default::default(),
Default::default(),
Self::static_type().to_owned(),
ctx,
)
}
pub fn new_ref(
name: &str,
bases: Vec<PyRef<Self>>,
attrs: PyAttributes,
slots: PyTypeSlots,
metaclass: PyRef<Self>,
ctx: &Context,
) -> Result<PyRef<Self>, String> {
Self::new_verbose_ref(
name,
bases[0].clone(),
bases,
attrs,
slots,
HeapTypeExt::default(),
metaclass,
ctx,
)
}
#[allow(clippy::too_many_arguments)]
fn new_verbose_ref(
name: &str,
base: PyRef<Self>,
bases: Vec<PyRef<Self>>,
attrs: PyAttributes,
mut slots: PyTypeSlots,
heaptype_ext: HeapTypeExt,
metaclass: PyRef<Self>,
ctx: &Context,
) -> Result<PyRef<Self>, String> {
// Check for duplicates in bases.
let mut unique_bases = HashSet::new();
for base in &bases {
if !unique_bases.insert(base.get_id()) {
return Err(format!("duplicate base class {}", base.name()));
}
}
let mros = bases
.iter()
.map(|x| x.iter_mro().map(|x| x.to_owned()).collect())
.collect();
let mro = linearise_mro(mros)?;
if base.slots.flags.has_feature(PyTypeFlags::HAS_DICT) {
slots.flags |= PyTypeFlags::HAS_DICT
}
*slots.name.get_mut() = Some(String::from(name));
let new_type = PyRef::new_ref(
PyType {
base: Some(base),
bases,
mro,
subclasses: PyRwLock::default(),
attributes: PyRwLock::new(attrs),
slots,
heaptype_ext: Some(Pin::new(Box::new(heaptype_ext))),
},
metaclass,
None,
);
new_type.init_slots(ctx);
let weakref_type = super::PyWeak::static_type();
for base in &new_type.bases {
base.subclasses.write().push(
new_type
.as_object()
.downgrade_with_weakref_typ_opt(None, weakref_type.to_owned())
.unwrap(),
);
}
Ok(new_type)
}
pub fn new_bare_ref(
name: &str,
base: PyRef<Self>,
attrs: PyAttributes,
mut slots: PyTypeSlots,
metaclass: PyRef<Self>,
) -> Result<PyRef<Self>, String> {
if base.slots.flags.has_feature(PyTypeFlags::HAS_DICT) {
slots.flags |= PyTypeFlags::HAS_DICT
}
*slots.name.get_mut() = Some(String::from(name));
let bases = vec![base.clone()];
let mro = base.iter_mro().map(|x| x.to_owned()).collect();
let new_type = PyRef::new_ref(
PyType {
base: Some(base),
bases,
mro,
subclasses: PyRwLock::default(),
attributes: PyRwLock::new(attrs),
slots,
heaptype_ext: None,
},
metaclass,
None,
);
let weakref_type = super::PyWeak::static_type();
for base in &new_type.bases {
base.subclasses.write().push(
new_type
.as_object()
.downgrade_with_weakref_typ_opt(None, weakref_type.to_owned())
.unwrap(),
);
}
Ok(new_type)
}
pub(crate) fn init_slots(&self, ctx: &Context) {
#[allow(clippy::mutable_key_type)]
let mut slot_name_set = std::collections::HashSet::new();
for cls in self.mro.iter() {
for &name in cls.attributes.read().keys() {
if name == identifier!(ctx, __new__) {
continue;
}
if name.as_str().starts_with("__") && name.as_str().ends_with("__") {
slot_name_set.insert(name);
}
}
}
for &name in self.attributes.read().keys() {
if name.as_str().starts_with("__") && name.as_str().ends_with("__") {
slot_name_set.insert(name);
}
}
for attr_name in slot_name_set {
self.update_slot::<true>(attr_name, ctx);
}
}
pub fn slot_name(&self) -> String {
self.slots.name.read().as_ref().unwrap().to_string()
}
pub fn iter_mro(&self) -> impl Iterator<Item = &PyType> + DoubleEndedIterator {
std::iter::once(self).chain(self.mro.iter().map(|cls| -> &PyType { cls }))
}
pub(crate) fn mro_find_map<F, R>(&self, f: F) -> Option<R>
where
F: Fn(&Self) -> Option<R>,
{
// the hot path will be primitive types which usually hit the result from itself.
// try std::intrinsics::likely once it is stablized
if let Some(r) = f(self) {
Some(r)
} else {
self.mro.iter().find_map(|cls| f(cls))
}
}
// This is used for class initialisation where the vm is not yet available.
pub fn set_str_attr<V: Into<PyObjectRef>>(
&self,
attr_name: &str,
value: V,
ctx: impl AsRef<Context>,
) {
let attr_name = ctx.as_ref().intern_str(attr_name);
self.set_attr(attr_name, value.into())
}
pub fn set_attr(&self, attr_name: &'static PyStrInterned, value: PyObjectRef) {
self.attributes.write().insert(attr_name, value);
}
/// This is the internal get_attr implementation for fast lookup on a class.
pub fn get_attr(&self, attr_name: &'static PyStrInterned) -> Option<PyObjectRef> {
flame_guard!(format!("class_get_attr({:?})", attr_name));
self.get_direct_attr(attr_name)
.or_else(|| self.get_super_attr(attr_name))
}
pub fn get_direct_attr(&self, attr_name: &'static PyStrInterned) -> Option<PyObjectRef> {
self.attributes.read().get(attr_name).cloned()
}
pub fn get_super_attr(&self, attr_name: &'static PyStrInterned) -> Option<PyObjectRef> {
self.mro
.iter()
.find_map(|class| class.attributes.read().get(attr_name).cloned())
}
// 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
.iter()
.any(|c| c.attributes.read().contains_key(attr_name))
}
pub fn get_attributes(&self) -> PyAttributes {
// Gather all members here:
let mut attributes = PyAttributes::default();
for bc in self.iter_mro().rev() {
for (name, value) in bc.attributes.read().iter() {
attributes.insert(name.to_owned(), value.clone());
}
}
attributes
}
}
impl Py<PyType> {
/// 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.
pub fn fast_issubclass(&self, cls: &impl Borrow<crate::PyObject>) -> bool {
self.as_object().is(cls.borrow()) || self.mro.iter().any(|c| c.is(cls.borrow()))
}
pub fn iter_mro(&self) -> impl Iterator<Item = &Py<PyType>> + DoubleEndedIterator {
std::iter::once(self).chain(self.mro.iter().map(|x| x.deref()))
}
pub fn iter_base_chain(&self) -> impl Iterator<Item = &Py<PyType>> {
std::iter::successors(Some(self), |cls| cls.base.as_deref())
}
}
#[pyclass(with(GetAttr, SetAttr, Callable, AsNumber), flags(BASETYPE))]
impl PyType {
// bound method for every type
pub(crate) fn __new__(zelf: PyRef<Self>, args: FuncArgs, vm: &VirtualMachine) -> PyResult {
let (subtype, args): (PyRef<Self>, FuncArgs) = args.bind(vm)?;
if !subtype.fast_issubclass(&zelf) {
return Err(vm.new_type_error(format!(
"{zelf}.__new__({subtype}): {subtype} is not a subtype of {zelf}",
zelf = zelf.name(),
subtype = subtype.name(),
)));
}
call_slot_new(zelf, subtype, args, vm)
}
#[pygetset(name = "__mro__")]
fn get_mro(zelf: PyRef<Self>) -> PyTuple {
let elements: Vec<PyObjectRef> =
zelf.iter_mro().map(|x| x.as_object().to_owned()).collect();
PyTuple::new_unchecked(elements.into_boxed_slice())
}
#[pygetset(magic)]
fn bases(&self, vm: &VirtualMachine) -> PyTupleRef {
vm.ctx.new_tuple(
self.bases
.iter()
.map(|x| x.as_object().to_owned())
.collect(),
)
}
#[pygetset(magic)]
fn base(&self) -> Option<PyTypeRef> {
self.base.clone()
}
#[pygetset(magic)]
fn flags(&self) -> u64 {
self.slots.flags.bits()
}
#[pymethod(magic)]
fn dir(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyList {
let attributes: Vec<PyObjectRef> = zelf
.get_attributes()
.into_iter()
.map(|(k, _)| k.to_object())
.collect();
PyList::from(attributes)
}
#[pymethod(magic)]
fn instancecheck(zelf: PyRef<Self>, obj: PyObjectRef) -> bool {
obj.fast_isinstance(&zelf)
}
#[pymethod(magic)]
fn subclasscheck(zelf: PyRef<Self>, subclass: PyTypeRef) -> bool {
subclass.fast_issubclass(&zelf)
}
#[pyclassmethod(magic)]
fn subclasshook(_args: FuncArgs, vm: &VirtualMachine) -> PyObjectRef {
vm.ctx.not_implemented()
}
#[pygetset]
fn __name__(&self) -> String {
self.name().to_string()
}
pub fn name(&self) -> BorrowedValue<str> {
PyRwLockReadGuard::map(self.slots.name.read(), |slot_name| {
let name = slot_name.as_ref().unwrap();
if self.slots.flags.has_feature(PyTypeFlags::HEAPTYPE) {
name.as_str()
} else {
name.rsplit('.').next().unwrap()
}
})
.into()
}
#[pymethod(magic)]
fn repr(&self, vm: &VirtualMachine) -> String {
let module = self.module(vm);
let module = module.downcast_ref::<PyStr>().map(|m| m.as_str());
match module {
Some(module) if module != "builtins" => {
let name = self.name();
format!(
"<class '{}.{}'>",
module,
self.qualname(vm)
.downcast_ref::<PyStr>()
.map(|n| n.as_str())
.unwrap_or_else(|| &name)
)
}
_ => format!("<class '{}'>", self.slot_name()),
}
}
#[pygetset(magic)]
pub fn qualname(&self, vm: &VirtualMachine) -> PyObjectRef {
self.attributes
.read()
.get(identifier!(vm, __qualname__))
.cloned()
// We need to exclude this method from going into recursion:
.and_then(|found| {
if found.fast_isinstance(vm.ctx.types.getset_type) {
None
} else {
Some(found)
}
})
.unwrap_or_else(|| vm.ctx.new_str(self.name().deref()).into())
}
#[pygetset(magic, setter)]
fn set_qualname(&self, value: PySetterValue, vm: &VirtualMachine) -> PyResult<()> {
// TODO: we should replace heaptype flag check to immutable flag check
if !self.slots.flags.has_feature(PyTypeFlags::HEAPTYPE) {
return Err(vm.new_type_error(format!(
"cannot set '__qualname__' attribute of immutable type '{}'",
self.name()
)));
};
let value = value.ok_or_else(|| {
vm.new_type_error(format!(
"cannot delete '__qualname__' attribute of immutable type '{}'",
self.name()
))
})?;
if !value.class().fast_issubclass(vm.ctx.types.str_type) {
return Err(vm.new_type_error(format!(
"can only assign string to {}.__qualname__, not '{}'",
self.name(),
value.class().name()
)));
}
self.attributes
.write()
.insert(identifier!(vm, __qualname__), value);
Ok(())
}
#[pygetset(magic)]
fn annotations(&self, vm: &VirtualMachine) -> PyResult<PyObjectRef> {
if !self.slots.flags.has_feature(PyTypeFlags::HEAPTYPE) {
return Err(vm.new_attribute_error(format!(
"type object '{}' has no attribute '__annotations__'",
self.name()
)));
}
let __annotations__ = identifier!(vm, __annotations__);
let annotations = self.attributes.read().get(__annotations__).cloned();
let annotations = if let Some(annotations) = annotations {
annotations
} else {
let annotations: PyObjectRef = vm.ctx.new_dict().into();
let removed = self
.attributes
.write()
.insert(__annotations__, annotations.clone());
debug_assert!(removed.is_none());
annotations
};
Ok(annotations)
}
#[pygetset(magic, setter)]
fn set_annotations(&self, value: Option<PyObjectRef>, vm: &VirtualMachine) -> PyResult<()> {
if self.slots.flags.has_feature(PyTypeFlags::IMMUTABLETYPE) {
return Err(vm.new_type_error(format!(
"cannot set '__annotations__' attribute of immutable type '{}'",
self.name()
)));
}
let __annotations__ = identifier!(vm, __annotations__);
if let Some(value) = value {
self.attributes.write().insert(__annotations__, value);
} else {
self.attributes
.read()
.get(__annotations__)
.cloned()
.ok_or_else(|| {
vm.new_attribute_error(format!(
"'{}' object has no attribute '__annotations__'",
self.name()
))
})?;
}
Ok(())
}
#[pygetset(magic)]
pub fn module(&self, vm: &VirtualMachine) -> PyObjectRef {
self.attributes
.read()
.get(identifier!(vm, __module__))
.cloned()
// We need to exclude this method from going into recursion:
.and_then(|found| {
if found.fast_isinstance(vm.ctx.types.getset_type) {
None
} else {
Some(found)
}
})
.unwrap_or_else(|| vm.ctx.new_str(ascii!("builtins")).into())
}
#[pygetset(magic, setter)]
fn set_module(&self, value: PyObjectRef, vm: &VirtualMachine) {
self.attributes
.write()
.insert(identifier!(vm, __module__), value);
}
#[pyclassmethod(magic)]
fn prepare(
_cls: PyTypeRef,
_name: OptionalArg<PyObjectRef>,
_bases: OptionalArg<PyObjectRef>,
_kwargs: KwArgs,
vm: &VirtualMachine,
) -> PyDictRef {
vm.ctx.new_dict()
}
#[pymethod(magic)]
fn subclasses(&self) -> PyList {
let mut subclasses = self.subclasses.write();
subclasses.retain(|x| x.upgrade().is_some());
PyList::from(
subclasses
.iter()
.map(|x| x.upgrade().unwrap())
.collect::<Vec<_>>(),
)
}
#[pymethod]
fn mro(zelf: PyRef<Self>) -> Vec<PyObjectRef> {
zelf.iter_mro().map(|cls| cls.to_owned().into()).collect()
}
#[pymethod(magic)]
pub fn ror(zelf: PyObjectRef, other: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
or_(other, zelf, vm)
}
#[pymethod(magic)]
pub fn or(zelf: PyObjectRef, other: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
or_(zelf, other, vm)
}
#[pyslot]
fn slot_new(metatype: PyTypeRef, args: FuncArgs, vm: &VirtualMachine) -> PyResult {
vm_trace!("type.__new__ {:?}", args);
let is_type_type = metatype.is(vm.ctx.types.type_type);
if is_type_type && args.args.len() == 1 && args.kwargs.is_empty() {
return Ok(args.args[0].class().to_owned().into());
}
if args.args.len() != 3 {
return Err(vm.new_type_error(if is_type_type {
"type() takes 1 or 3 arguments".to_owned()
} else {
format!(
"type.__new__() takes exactly 3 arguments ({} given)",
args.args.len()
)
}));
}
let (name, bases, dict, kwargs): (PyStrRef, PyTupleRef, PyDictRef, KwArgs) =
args.clone().bind(vm)?;
if name.as_str().contains(char::from(0)) {
return Err(vm.new_value_error("type name must not contain null characters".to_owned()));
}
let (metatype, base, bases) = if bases.is_empty() {
let base = vm.ctx.types.object_type.to_owned();
(metatype, base.clone(), vec![base])
} else {
let bases = bases
.iter()
.map(|obj| {
obj.clone().downcast::<PyType>().or_else(|obj| {
if vm
.get_attribute_opt(obj, identifier!(vm, __mro_entries__))?
.is_some()
{
Err(vm.new_type_error(
"type() doesn't support MRO entry resolution; \
use types.new_class()"
.to_owned(),
))
} else {
Err(vm.new_type_error("bases must be types".to_owned()))
}
})
})
.collect::<PyResult<Vec<_>>>()?;
// Search the bases for the proper metatype to deal with this:
let winner = calculate_meta_class(metatype.clone(), &bases, vm)?;
let metatype = if !winner.is(&metatype) {
if let Some(ref slot_new) = winner.slots.new.load() {
// Pass it to the winner
return slot_new(winner, args, vm);
}
winner
} else {
metatype
};
let base = best_base(&bases, vm)?;
(metatype, base, bases)
};
let mut attributes = dict.to_attributes(vm);
if let Some(f) = attributes.get_mut(identifier!(vm, __new__)) {
if f.class().is(vm.ctx.types.function_type) {
*f = PyStaticMethod::from(f.clone()).into_pyobject(vm);
}
}
if let Some(f) = attributes.get_mut(identifier!(vm, __init_subclass__)) {
if f.class().is(vm.ctx.types.function_type) {
*f = PyClassMethod::from(f.clone()).into_pyobject(vm);
}
}
if let Some(f) = attributes.get_mut(identifier!(vm, __class_getitem__)) {
if f.class().is(vm.ctx.types.function_type) {
*f = PyClassMethod::from(f.clone()).into_pyobject(vm);
}
}
if let Some(current_frame) = vm.current_frame() {
let entry = attributes.entry(identifier!(vm, __module__));
if matches!(entry, Entry::Vacant(_)) {
let module_name = vm.unwrap_or_none(
current_frame
.globals
.get_item_opt(identifier!(vm, __name__), vm)?,
);
entry.or_insert(module_name);
}
}
attributes
.entry(identifier!(vm, __qualname__))
.or_insert_with(|| vm.ctx.new_str(name.as_str()).into());
// All *classes* should have a dict. Exceptions are *instances* of
// classes that define __slots__ and instances of built-in classes
// (with exceptions, e.g function)
let __dict__ = identifier!(vm, __dict__);
attributes.entry(__dict__).or_insert_with(|| {
vm.ctx
.new_getset(
"__dict__",
vm.ctx.types.object_type,
subtype_get_dict,
subtype_set_dict,
)
.into()
});
// TODO: Flags is currently initialized with HAS_DICT. Should be
// updated when __slots__ are supported (toggling the flag off if
// a class has __slots__ defined).
let heaptype_slots: Option<PyTupleTyped<PyStrRef>> =
if let Some(x) = attributes.get(identifier!(vm, __slots__)) {
Some(if x.to_owned().class().is(vm.ctx.types.str_type) {
PyTupleTyped::<PyStrRef>::try_from_object(
vm,
vec![x.to_owned()].into_pytuple(vm).into(),
)?
} else {
let iter = x.to_owned().get_iter(vm)?;
let elements = {
let mut elements = Vec::new();
while let PyIterReturn::Return(element) = iter.next(vm)? {
elements.push(element);
}
elements
};
PyTupleTyped::<PyStrRef>::try_from_object(vm, elements.into_pytuple(vm).into())?
})
} else {
None
};
let base_member_count = base.slots.member_count;
let member_count: usize =
base.slots.member_count + heaptype_slots.as_ref().map(|x| x.len()).unwrap_or(0);
let flags = PyTypeFlags::heap_type_flags() | PyTypeFlags::HAS_DICT;
let heaptype_ext = HeapTypeExt {
slots: heaptype_slots.to_owned(),
..HeapTypeExt::default()
};
let slots = PyTypeSlots {
member_count,
..PyTypeSlots::from_flags(flags)
};
let typ = Self::new_verbose_ref(
name.as_str(),
base,
bases,
attributes,
slots,
heaptype_ext,
metatype,
&vm.ctx,
)
.map_err(|e| vm.new_type_error(e))?;
if let Some(ref slots) = heaptype_slots {
let mut offset = base_member_count;
for member in slots.as_slice() {
let member_def = MemberDef {
name: member.to_string(),
kind: MemberKind::ObjectEx,
getter: MemberGetter::Offset(offset),
setter: MemberSetter::Offset(offset),
doc: None,
};
let member_descriptor: PyRef<MemberDescrObject> = vm.new_pyref(MemberDescrObject {
common: DescrObject {
typ: typ.to_owned(),
name: member.to_string(),
qualname: PyRwLock::new(None),
},
member: member_def,
});
let attr_name = vm.ctx.intern_str(member.to_string());
if !typ.has_attr(attr_name) {
typ.set_attr(attr_name, member_descriptor.into());
}
offset += 1;
}
}
if let Some(cell) = typ.attributes.write().get(identifier!(vm, __classcell__)) {
let cell = PyCellRef::try_from_object(vm, cell.clone()).map_err(|_| {
vm.new_type_error(format!(
"__classcell__ must be a nonlocal cell, not {}",
cell.class().name()
))
})?;
cell.set(Some(typ.clone().to_pyobject(vm)));
};
// avoid deadlock
let attributes = typ
.attributes
.read()
.iter()
.filter_map(|(name, obj)| {
vm.get_method(obj.clone(), identifier!(vm, __set_name__))
.map(|res| res.map(|meth| (obj.clone(), name.to_owned(), meth)))
})
.collect::<PyResult<Vec<_>>>()?;
for (obj, name, set_name) in attributes {
vm.invoke(&set_name, (typ.clone(), name.to_owned()))
.map_err(|e| {
let err = vm.new_runtime_error(format!(
"Error calling __set_name__ on '{}' instance {} in '{}'",
obj.class().name(),
name,
typ.name()
));
err.set_cause(Some(e));
err
})?;
}
if let Some(init_subclass) = typ.get_super_attr(identifier!(vm, __init_subclass__)) {
let init_subclass = vm
.call_get_descriptor_specific(init_subclass.clone(), None, Some(typ.clone().into()))
.unwrap_or(Ok(init_subclass))?;
vm.invoke(&init_subclass, kwargs)?;
};
Ok(typ.into())
}
#[pygetset(magic)]
fn dict(zelf: PyRef<Self>) -> PyMappingProxy {
PyMappingProxy::from(zelf)
}
#[pygetset(magic, setter)]
fn set_dict(&self, _value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
Err(vm.new_not_implemented_error(
"Setting __dict__ attribute on a type isn't yet implemented".to_owned(),
))
}
#[pygetset(magic, setter)]
fn set_name(&self, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
if !self.slots.flags.has_feature(PyTypeFlags::HEAPTYPE) {
return Err(vm.new_type_error(format!(
"cannot set '{}' attribute of immutable type '{}'",
"__name__",
self.name()
)));
}
let name = value.downcast_ref::<PyStr>().ok_or_else(|| {
vm.new_type_error(format!(
"can only assign string to {}.__name__, not '{}'",
self.name(),
value.class().name()
))
})?;
if name.as_str().contains(char::from(0)) {
return Err(vm.new_value_error("type name must not contain null characters".to_owned()));
}
*self.slots.name.write() = Some(name.as_str().to_string());
Ok(())
}
#[pygetset(magic)]
fn text_signature(&self) -> Option<String> {
self.slots
.doc
.and_then(|doc| get_text_signature_from_internal_doc(&self.name(), doc))
.map(|signature| signature.to_string())
}
}
const SIGNATURE_END_MARKER: &str = ")\n--\n\n";
fn get_signature(doc: &str) -> Option<&str> {
doc.find(SIGNATURE_END_MARKER).map(|index| &doc[..=index])
}
fn find_signature<'a>(name: &str, doc: &'a str) -> Option<&'a str> {
let name = name.rsplit('.').next().unwrap();
let doc = doc.strip_prefix(name)?;
if !doc.starts_with('(') {
None
} else {
Some(doc)
}
}
pub(crate) fn get_text_signature_from_internal_doc<'a>(
name: &str,
internal_doc: &'a str,
) -> Option<&'a str> {
find_signature(name, internal_doc).and_then(get_signature)
}
impl GetAttr for PyType {
fn getattro(zelf: &Py<Self>, name_str: PyStrRef, vm: &VirtualMachine) -> PyResult {
#[cold]
fn attribute_error(
zelf: &Py<PyType>,
name: &str,
vm: &VirtualMachine,
) -> PyBaseExceptionRef {
vm.new_attribute_error(format!(
"type object '{}' has no attribute '{}'",
zelf.slot_name(),
name,
))
}
let Some(name) = vm.ctx.interned_str(&*name_str) else {
return Err(attribute_error(zelf, name_str.as_str(), vm));
};
vm_trace!("type.__getattribute__({:?}, {:?})", zelf, name);
let mcl = zelf.class();
let mcl_attr = mcl.get_attr(name);
if let Some(ref attr) = mcl_attr {
let attr_class = attr.class();
let has_descr_set = attr_class
.mro_find_map(|cls| cls.slots.descr_set.load())
.is_some();
if has_descr_set {
let descr_get = attr_class.mro_find_map(|cls| cls.slots.descr_get.load());
if let Some(descr_get) = descr_get {
let mcl = mcl.to_owned().into();
return descr_get(attr.clone(), Some(zelf.to_owned().into()), Some(mcl), vm);
}
}
}
let zelf_attr = zelf.get_attr(name);
if let Some(ref attr) = zelf_attr {
let descr_get = attr.class().mro_find_map(|cls| cls.slots.descr_get.load());
if let Some(descr_get) = descr_get {
return descr_get(attr.clone(), None, Some(zelf.to_owned().into()), vm);
}
}
if let Some(cls_attr) = zelf_attr {
Ok(cls_attr)
} else if let Some(attr) = mcl_attr {