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Make PyClassShell have dict&weakref

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This commit is contained in:
kngwyu 2019-12-08 17:18:25 +09:00
parent 4b5fa7e977
commit bdb66afe0a
15 changed files with 210 additions and 90 deletions
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46
pyo3-derive-backend/src/pyclass.rs
View file

@ -126,10 +126,10 @@ impl PyClassArgs {
let flag = exp.path.segments.first().unwrap().ident.to_string();
let path = match flag.as_str() {
"gc" => {
parse_quote! {pyo3::type_object::PY_TYPE_FLAG_GC}
parse_quote! {pyo3::type_flags::GC}
}
"weakref" => {
parse_quote! {pyo3::type_object::PY_TYPE_FLAG_WEAKREF}
parse_quote! {pyo3::type_flags::WEAKREF}
}
"subclass" => {
if cfg!(not(feature = "unsound-subclass")) {
@ -138,10 +138,10 @@ impl PyClassArgs {
"You need to activate the `unsound-subclass` feature if you want to use subclassing",
));
}
parse_quote! {pyo3::type_object::PY_TYPE_FLAG_BASETYPE}
parse_quote! {pyo3::type_flags::BASETYPE}
}
"dict" => {
parse_quote! {pyo3::type_object::PY_TYPE_FLAG_DICT}
parse_quote! {pyo3::type_flags::DICT}
}
_ => {
return Err(syn::Error::new_spanned(
@ -267,7 +267,7 @@ fn impl_class(
let extra = {
if let Some(freelist) = &attr.freelist {
quote! {
impl pyo3::freelist::PyObjectWithFreeList for #cls {
impl pyo3::freelist::PyClassWithFreeList for #cls {
#[inline]
fn get_free_list() -> &'static mut pyo3::freelist::FreeList<*mut pyo3::ffi::PyObject> {
static mut FREELIST: *mut pyo3::freelist::FreeList<*mut pyo3::ffi::PyObject> = 0 as *mut _;
@ -285,7 +285,7 @@ fn impl_class(
}
} else {
quote! {
impl pyo3::type_object::PyObjectAlloc for #cls {}
impl pyo3::pyclass::PyClassAlloc for #cls {}
}
}
};
@ -308,24 +308,25 @@ fn impl_class(
let mut has_gc = false;
for f in attr.flags.iter() {
if let syn::Expr::Path(ref epath) = f {
if epath.path == parse_quote! {pyo3::type_object::PY_TYPE_FLAG_WEAKREF} {
if epath.path == parse_quote! { pyo3::type_flags::WEAKREF } {
has_weakref = true;
} else if epath.path == parse_quote! {pyo3::type_object::PY_TYPE_FLAG_DICT} {
} else if epath.path == parse_quote! { pyo3::type_flags::DICT } {
has_dict = true;
} else if epath.path == parse_quote! {pyo3::type_object::PY_TYPE_FLAG_GC} {
} else if epath.path == parse_quote! { pyo3::type_flags::GC } {
has_gc = true;
}
}
}
// TODO: implement dict and weakref
let weakref = if has_weakref {
quote! {std::mem::size_of::<*const pyo3::ffi::PyObject>()}
quote! { type WeakRef = pyo3::pyclass_slots::PyClassWeakRefSlot; }
} else {
quote! {0}
quote! { type WeakRef = pyo3::pyclass_slots::PyClassDummySlot; }
};
let dict = if has_dict {
quote! {std::mem::size_of::<*const pyo3::ffi::PyObject>()}
quote! { type Dict = pyo3::pyclass_slots::PyClassDictSlot; }
} else {
quote! {0}
quote! { type Dict = pyo3::pyclass_slots::PyClassDummySlot; }
};
let module = if let Some(m) = &attr.module {
quote! { Some(#m) }
@ -358,25 +359,13 @@ fn impl_class(
impl pyo3::type_object::PyTypeInfo for #cls {
type Type = #cls;
type BaseType = #base;
type ConcreteLayout = pyo3::pyclass::PyClassShell<Self>;
const NAME: &'static str = #cls_name;
const MODULE: Option<&'static str> = #module;
const DESCRIPTION: &'static str = #doc;
const FLAGS: usize = #(#flags)|*;
const SIZE: usize = {
Self::OFFSET as usize +
::std::mem::size_of::<#cls>() + #weakref + #dict
};
const OFFSET: isize = {
// round base_size up to next multiple of align
(
(<#base as pyo3::type_object::PyTypeInfo>::SIZE +
::std::mem::align_of::<#cls>() - 1) /
::std::mem::align_of::<#cls>() * ::std::mem::align_of::<#cls>()
) as isize
};
#[inline]
unsafe fn type_object() -> &'static mut pyo3::ffi::PyTypeObject {
static mut TYPE_OBJECT: pyo3::ffi::PyTypeObject = pyo3::ffi::PyTypeObject_INIT;
@ -384,6 +373,11 @@ fn impl_class(
}
}
impl pyo3::PyClass for #cls {
#dict
#weakref
}
impl pyo3::IntoPy<PyObject> for #cls {
fn into_py(self, py: pyo3::Python) -> pyo3::PyObject {
pyo3::IntoPy::into_py(pyo3::Py::new(py, self).unwrap(), py)

17
pyo3-derive-backend/src/pymethod.rs
View file

@ -237,25 +237,14 @@ pub fn impl_wrap_new(cls: &syn::Type, name: &syn::Ident, spec: &FnSpec<'_>) -> T
const _LOCATION: &'static str = concat!(stringify!(#cls),".",stringify!(#name),"()");
let _py = pyo3::Python::assume_gil_acquired();
let _pool = pyo3::GILPool::new(_py);
match pyo3::type_object::PyRawObject::new(_py, #cls::type_object(), _cls) {
Ok(_obj) => {
let _args = _py.from_borrowed_ptr::<pyo3::types::PyTuple>(_args);
let _kwargs: Option<&pyo3::types::PyDict> = _py.from_borrowed_ptr_or_opt(_kwargs);
#body
match _result {
Ok(_) => pyo3::IntoPyPointer::into_ptr(_obj),
Err(e) => {
e.restore(_py);
::std::ptr::null_mut()
}
}
}
Err(e) => {
e.restore(_py);
::std::ptr::null_mut()
}
match <<#cls as pyo3::PyTypeInfo>::ConcreteLayout as pyo3::pyclass::PyClassNew>::new(_py, _result) {
Ok(_slf) => _slf as _,
Err(e) => e.restore_and_null(),
}
}
}

2
src/class/iter.rs
View file

@ -4,7 +4,7 @@
use crate::callback::{CallbackConverter, PyObjectCallbackConverter};
use crate::err::PyResult;
use crate::{ffi, IntoPy, PyClass, PyClassShell, PyObject};
use crate::{ffi, pyclass::PyClassShell, IntoPy, PyClass, PyObject};
use crate::{IntoPyPointer, Python};
use std::ptr;

2
src/class/macros.rs
View file

@ -35,7 +35,7 @@ macro_rules! py_unary_pyref_func {
where
T: for<'p> $trait<'p>,
{
use $crate::{FromPyPointer, PyClassShell};
use $crate::{pyclass::PyClassShell, FromPyPointer};
let py = $crate::Python::assume_gil_acquired();
let _pool = $crate::GILPool::new(py);
let slf: &mut PyClassShell<T> = FromPyPointer::from_borrowed_ptr_or_panic(py, slf);

7
src/err.rs
View file

@ -326,6 +326,13 @@ impl PyErr {
unsafe { ffi::PyErr_Restore(ptype.into_ptr(), pvalue, ptraceback.into_ptr()) }
}
#[doc(hidden)]
/// Utility method for proc-macro code
pub fn restore_and_null<T>(self, py: Python) -> *mut T {
self.restore(py);
std::ptr::null_mut()
}
/// Issue a warning message.
/// May return a PyErr if warnings-as-errors is enabled.
pub fn warn(py: Python, category: &PyAny, message: &str, stacklevel: i32) -> PyResult<()> {

8
src/freelist.rs
View file

@ -12,7 +12,7 @@ use std::os::raw::c_void;
/// Implementing this trait for custom class adds free allocation list to class.
/// The performance improvement applies to types that are often created and deleted in a row,
/// so that they can benefit from a freelist.
pub trait PyObjectWithFreeList {
pub trait PyClassWithFreeList {
fn get_free_list() -> &'static mut FreeList<*mut ffi::PyObject>;
}
@ -70,10 +70,10 @@ impl<T> FreeList<T> {
impl<T> PyClassAlloc for T
where
T: PyTypeInfo + PyObjectWithFreeList,
T: PyTypeInfo + PyClassWithFreeList,
{
unsafe fn alloc(_py: Python) -> *mut Self::ConcreteLayout {
if let Some(obj) = <Self as PyObjectWithFreeList>::get_free_list().pop() {
if let Some(obj) = <Self as PyClassWithFreeList>::get_free_list().pop() {
ffi::PyObject_Init(obj, <Self as PyTypeInfo>::type_object());
obj as _
} else {
@ -89,7 +89,7 @@ where
return;
}
if let Some(obj) = <Self as PyObjectWithFreeList>::get_free_list().insert(obj) {
if let Some(obj) = <Self as PyClassWithFreeList>::get_free_list().insert(obj) {
match Self::type_object().tp_free {
Some(free) => free(obj as *mut c_void),
None => tp_free_fallback(obj),

7
src/instance.rs
View file

@ -36,11 +36,16 @@ unsafe impl<T> Sync for Py<T> {}
impl<T> Py<T> {
/// Create new instance of T and move it under python management
///
/// **NOTE**
/// This method's `where` bound is actually the same as `PyClass`.
/// However, since Rust still doesn't have higher order generics, we cannot represent
/// this bound by `PyClass`.
pub fn new(py: Python, value: T) -> PyResult<Py<T>>
where
T: PyClass,
{
let obj = unsafe { PyClassShell::<T>::new(py, value) };
let obj = unsafe { PyClassShell::new(py, value)? };
let ob = unsafe { Py::from_owned_ptr(obj as _) };
Ok(ob)
}

19
src/internal_tricks.rs
View file

@ -4,3 +4,22 @@ use std::rc::Rc;
/// A marker type that makes the type !Send.
/// Temporal hack until https://github.com/rust-lang/rust/issues/13231 is resolved.
pub(crate) type Unsendable = PhantomData<Rc<()>>;
pub struct PrivateMarker;
macro_rules! private_decl {
() => {
/// This trait is private to implement; this method exists to make it
/// impossible to implement outside the crate.
fn __private__(&self) -> crate::internal_tricks::PrivateMarker;
}
}
macro_rules! private_impl {
() => {
#[doc(hidden)]
fn __private__(&self) -> crate::internal_tricks::PrivateMarker {
crate::internal_tricks::PrivateMarker
}
}
}

8
src/lib.rs
View file

@ -124,12 +124,12 @@ pub use crate::conversion::{
};
pub use crate::err::{PyDowncastError, PyErr, PyErrArguments, PyErrValue, PyResult};
pub use crate::gil::{init_once, GILGuard, GILPool};
pub use crate::instance::{ManagedPyRef, Py, PyNativeType};
pub use crate::instance::{AsPyRef, ManagedPyRef, Py, PyNativeType};
pub use crate::object::PyObject;
pub use crate::objectprotocol::ObjectProtocol;
pub use crate::pyclass::{PyClass, PyClassAlloc, PyClassShell};
pub use crate::pyclass::{PyClass, PyClassShell};
pub use crate::python::{prepare_freethreaded_python, Python};
pub use crate::type_object::{PyConcreteObject, PyTypeInfo};
pub use crate::type_object::{type_flags, PyConcreteObject, PyTypeInfo};
// Re-exported for wrap_function
#[doc(hidden)]
@ -161,12 +161,14 @@ pub mod ffi;
pub mod freelist;
mod gil;
mod instance;
#[macro_use]
mod internal_tricks;
pub mod marshal;
mod object;
mod objectprotocol;
pub mod prelude;
pub mod pyclass;
pub mod pyclass_slots;
mod python;
pub mod type_object;
pub mod types;

1
src/object.rs
View file

@ -7,7 +7,6 @@ use crate::instance::{AsPyRef, PyNativeType};
use crate::types::{PyAny, PyDict, PyTuple};
use crate::{AsPyPointer, Py, Python};
use crate::{FromPyObject, IntoPy, IntoPyPointer, PyTryFrom, ToBorrowedObject, ToPyObject};
use std::convert::AsRef;
use std::ptr::NonNull;
/// A python object

84
src/pyclass.rs
View file

@ -1,8 +1,9 @@
//! An experiment module which has all codes related only to #[pyclass]
use crate::class::methods::{PyMethodDefType, PyMethodsProtocol};
use crate::conversion::FromPyPointer;
use crate::type_object::{PyConcreteObject, PyTypeObject};
use crate::{class, ffi, gil, PyErr, PyResult, PyTypeInfo, Python};
use crate::conversion::{AsPyPointer, FromPyPointer, ToPyObject};
use crate::pyclass_slots::{PyClassDict, PyClassWeakRef};
use crate::type_object::{type_flags, PyConcreteObject, PyTypeObject};
use crate::{class, ffi, gil, PyErr, PyObject, PyResult, PyTypeInfo, Python};
use std::ffi::CString;
use std::mem::ManuallyDrop;
use std::os::raw::c_void;
@ -46,7 +47,10 @@ pub unsafe fn tp_free_fallback(obj: *mut ffi::PyObject) {
}
}
pub trait PyClass: PyTypeInfo + Sized + PyClassAlloc + PyMethodsProtocol {}
pub trait PyClass: PyTypeInfo + Sized + PyClassAlloc + PyMethodsProtocol {
type Dict: PyClassDict;
type WeakRef: PyClassWeakRef;
}
unsafe impl<T> PyTypeObject for T
where
@ -75,21 +79,44 @@ where
pub struct PyClassShell<T: PyClass> {
ob_base: <T::BaseType as PyTypeInfo>::ConcreteLayout,
pyclass: ManuallyDrop<T>,
dict: T::Dict,
weakref: T::WeakRef,
}
impl<T: PyClass> PyClassShell<T> {
pub unsafe fn new(py: Python, value: T) -> *mut Self {
pub fn new_ref(py: Python, value: T) -> PyResult<&Self> {
unsafe {
let ptr = Self::new(py, value)?;
FromPyPointer::from_owned_ptr_or_err(py, ptr as _)
}
}
pub fn new_mut(py: Python, value: T) -> PyResult<&mut Self> {
unsafe {
let ptr = Self::new(py, value)?;
FromPyPointer::from_owned_ptr_or_err(py, ptr as _)
}
}
pub unsafe fn new(py: Python, value: T) -> PyResult<*mut Self> {
T::init_type();
let base = T::alloc(py);
if base.is_null() {
return Err(PyErr::fetch(py));
}
let self_ = base as *mut Self;
(*self_).pyclass = ManuallyDrop::new(value);
self_
(*self_).dict = T::Dict::new();
(*self_).weakref = T::WeakRef::new();
Ok(self_)
}
}
impl<T: PyClass> PyConcreteObject for PyClassShell<T> {
unsafe fn py_drop(&mut self, py: Python) {
ManuallyDrop::drop(&mut self.pyclass);
self.dict.clear_dict(py);
self.weakref.clear_weakrefs(self.as_ptr(), py);
self.ob_base.py_drop(py);
}
}
@ -107,6 +134,12 @@ impl<T: PyClass> std::ops::DerefMut for PyClassShell<T> {
}
}
impl<T: PyClass> ToPyObject for PyClassShell<T> {
fn to_object(&self, py: Python<'_>) -> PyObject {
unsafe { PyObject::from_borrowed_ptr(py, self.as_ptr()) }
}
}
unsafe impl<'p, T> FromPyPointer<'p> for &'p PyClassShell<T>
where
T: PyClass,
@ -131,18 +164,6 @@ where
}
}
/// type object supports python GC
const PY_TYPE_FLAG_GC: usize = 1;
/// Type object supports python weak references
const PY_TYPE_FLAG_WEAKREF: usize = 1 << 1;
/// Type object can be used as the base type of another type
const PY_TYPE_FLAG_BASETYPE: usize = 1 << 2;
/// The instances of this type have a dictionary containing instance variables
const PY_TYPE_FLAG_DICT: usize = 1 << 3;
/// Register new type in python object system.
#[cfg(not(Py_LIMITED_API))]
pub fn initialize_type<T>(py: Python, module_name: Option<&str>) -> PyResult<*mut ffi::PyTypeObject>
@ -182,19 +203,20 @@ where
type_object.tp_dealloc = Some(tp_dealloc_callback::<T>);
// type size
type_object.tp_basicsize = std::mem::size_of::<T::ConcreteLayout>() as isize;
type_object.tp_basicsize = std::mem::size_of::<T::ConcreteLayout>() as ffi::Py_ssize_t;
// weakref support (check py3cls::py_class::impl_class)
if T::FLAGS & PY_TYPE_FLAG_WEAKREF != 0 {
// STUB
type_object.tp_weaklistoffset = 0isize;
}
let mut offset = type_object.tp_basicsize;
// __dict__ support
let has_dict = T::FLAGS & PY_TYPE_FLAG_DICT != 0;
if has_dict {
// STUB
type_object.tp_dictoffset = 0isize;
if let Some(dict_offset) = T::Dict::OFFSET {
offset += dict_offset as ffi::Py_ssize_t;
type_object.tp_dictoffset = offset;
}
// weakref support
if let Some(weakref_offset) = T::WeakRef::OFFSET {
offset += weakref_offset as ffi::Py_ssize_t;
type_object.tp_weaklistoffset = offset;
}
// GC support
@ -243,7 +265,7 @@ where
// properties
let mut props = py_class_properties::<T>();
if has_dict {
if T::Dict::OFFSET.is_some() {
props.push(ffi::PyGetSetDef_DICT);
}
if !props.is_empty() {
@ -267,13 +289,13 @@ where
fn py_class_flags<T: PyTypeInfo>(type_object: &mut ffi::PyTypeObject) {
if type_object.tp_traverse != None
|| type_object.tp_clear != None
|| T::FLAGS & PY_TYPE_FLAG_GC != 0
|| T::FLAGS & type_flags::GC != 0
{
type_object.tp_flags = ffi::Py_TPFLAGS_DEFAULT | ffi::Py_TPFLAGS_HAVE_GC;
} else {
type_object.tp_flags = ffi::Py_TPFLAGS_DEFAULT;
}
if T::FLAGS & PY_TYPE_FLAG_BASETYPE != 0 {
if T::FLAGS & type_flags::BASETYPE != 0 {
type_object.tp_flags |= ffi::Py_TPFLAGS_BASETYPE;
}
}

72
src/pyclass_slots.rs Normal file
View file

@ -0,0 +1,72 @@
//! This module contains additional fields pf pyclass
// TODO(kngwyu): Add vectorcall support
use crate::{ffi, Python};
const POINTER_SIZE: isize = std::mem::size_of::<*mut ffi::PyObject>() as _;
/// Represents `__dict__`.
pub trait PyClassDict {
const OFFSET: Option<isize> = None;
fn new() -> Self;
fn clear_dict(&mut self, _py: Python) {}
private_decl! {}
}
/// Represents `__weakref__`.
pub trait PyClassWeakRef {
const OFFSET: Option<isize> = None;
fn new() -> Self;
fn clear_weakrefs(&mut self, _obj: *mut ffi::PyObject, _py: Python) {}
private_decl! {}
}
/// Dummy slot means the function doesn't has such a feature.
pub struct PyClassDummySlot;
impl PyClassDict for PyClassDummySlot {
private_impl! {}
fn new() -> Self {
PyClassDummySlot
}
}
impl PyClassWeakRef for PyClassDummySlot {
private_impl! {}
fn new() -> Self {
PyClassDummySlot
}
}
/// actural dict field
#[repr(transparent)]
pub struct PyClassDictSlot(*mut ffi::PyObject);
impl PyClassDict for PyClassDictSlot {
private_impl! {}
const OFFSET: Option<isize> = Some(-POINTER_SIZE);
fn new() -> Self {
Self(std::ptr::null_mut())
}
fn clear_dict(&mut self, _py: Python) {
if self.0 != std::ptr::null_mut() {
unsafe { ffi::PyDict_Clear(self.0) }
}
}
}
/// actural weakref field
#[repr(transparent)]
pub struct PyClassWeakRefSlot(*mut ffi::PyObject);
impl PyClassWeakRef for PyClassWeakRefSlot {
private_impl! {}
const OFFSET: Option<isize> = Some(-POINTER_SIZE);
fn new() -> Self {
Self(std::ptr::null_mut())
}
fn clear_weakrefs(&mut self, obj: *mut ffi::PyObject, _py: Python) {
if self.0 != std::ptr::null_mut() {
unsafe { ffi::PyObject_ClearWeakRefs(obj) }
}
}
}

19
src/type_object.rs
View file

@ -10,6 +10,7 @@ use crate::AsPyPointer;
use crate::Python;
use std::ptr::NonNull;
/// TODO: write document
pub trait PyConcreteObject: Sized {
unsafe fn py_drop(&mut self, _py: Python) {}
}
@ -22,6 +23,21 @@ impl<T: PyConcreteObject> AsPyPointer for T {
impl PyConcreteObject for ffi::PyObject {}
/// Our custom type flags
pub mod type_flags {
/// type object supports python GC
pub const GC: usize = 1;
/// Type object supports python weak references
pub const WEAKREF: usize = 1 << 1;
/// Type object can be used as the base type of another type
pub const BASETYPE: usize = 1 << 2;
/// The instances of this type have a dictionary containing instance variables
pub const DICT: usize = 1 << 3;
}
/// Python type information.
pub trait PyTypeInfo {
/// Type of objects to store in PyObject struct
@ -36,9 +52,6 @@ pub trait PyTypeInfo {
/// Class doc string
const DESCRIPTION: &'static str = "\0";
/// `Type` instance offset inside PyObject structure
const OFFSET: isize;
/// Type flags (ie PY_TYPE_FLAG_GC, PY_TYPE_FLAG_WEAKREF)
const FLAGS: usize = 0;

1
src/types/any.rs
View file

@ -1,4 +1,3 @@
use crate::conversion::AsPyPointer;
use crate::conversion::PyTryFrom;
use crate::err::PyDowncastError;
use crate::internal_tricks::Unsendable;

1
src/types/mod.rs
View file

@ -108,7 +108,6 @@ macro_rules! pyobject_native_type_convert(
const NAME: &'static str = stringify!($name);
const MODULE: Option<&'static str> = $module;
const OFFSET: isize = 0;
#[inline]
unsafe fn type_object() -> &'static mut $crate::ffi::PyTypeObject {