forked from RustPython/RustPython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathclass.rs
More file actions
162 lines (146 loc) · 4.88 KB
/
class.rs
File metadata and controls
162 lines (146 loc) · 4.88 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
//! Utilities to define a new Python class
use crate::{
builtins::{PyBaseObject, PyType, PyTypeRef},
function::PyMethodDef,
identifier,
object::Py,
types::{hash_not_implemented, PyTypeFlags, PyTypeSlots},
vm::Context,
};
use rustpython_common::static_cell;
pub trait StaticType {
// Ideally, saving PyType is better than PyTypeRef
fn static_cell() -> &'static static_cell::StaticCell<PyTypeRef>;
fn static_metaclass() -> &'static Py<PyType> {
PyType::static_type()
}
fn static_baseclass() -> &'static Py<PyType> {
PyBaseObject::static_type()
}
fn static_type() -> &'static Py<PyType> {
Self::static_cell()
.get()
.expect("static type has not been initialized. e.g. the native types defined in different module may be used before importing library.")
}
fn init_manually(typ: PyTypeRef) -> &'static Py<PyType> {
let cell = Self::static_cell();
cell.set(typ)
.unwrap_or_else(|_| panic!("double initialization from init_manually"));
cell.get().unwrap()
}
fn init_builtin_type() -> &'static Py<PyType>
where
Self: PyClassImpl,
{
let typ = Self::create_static_type();
let cell = Self::static_cell();
cell.set(typ)
.unwrap_or_else(|_| panic!("double initialization of {}", Self::NAME));
cell.get().unwrap()
}
fn create_static_type() -> PyTypeRef
where
Self: PyClassImpl,
{
PyType::new_static(
Self::static_baseclass().to_owned(),
Default::default(),
Self::make_slots(),
Self::static_metaclass().to_owned(),
)
.unwrap()
}
}
pub trait PyClassDef {
const NAME: &'static str;
const MODULE_NAME: Option<&'static str>;
const TP_NAME: &'static str;
const DOC: Option<&'static str> = None;
const BASICSIZE: usize;
const UNHASHABLE: bool = false;
// due to restriction of rust trait system, object.__base__ is None
// but PyBaseObject::Base will be PyBaseObject.
type Base: PyClassDef;
}
pub trait PyClassImpl: PyClassDef {
const TP_FLAGS: PyTypeFlags = PyTypeFlags::DEFAULT;
fn extend_class(ctx: &Context, class: &'static Py<PyType>)
where
Self: Sized,
{
#[cfg(debug_assertions)]
{
assert!(class.slots.flags.is_created_with_flags());
}
let _ = ctx.intern_str(Self::NAME); // intern type name
if Self::TP_FLAGS.has_feature(PyTypeFlags::HAS_DICT) {
let __dict__ = identifier!(ctx, __dict__);
class.set_attr(
__dict__,
ctx.new_getset(
"__dict__",
class,
crate::builtins::object::object_get_dict,
crate::builtins::object::object_set_dict,
)
.into(),
);
}
Self::impl_extend_class(ctx, class);
if let Some(doc) = Self::DOC {
class.set_attr(identifier!(ctx, __doc__), ctx.new_str(doc).into());
}
if let Some(module_name) = Self::MODULE_NAME {
class.set_attr(
identifier!(ctx, __module__),
ctx.new_str(module_name).into(),
);
}
if class.slots.new.load().is_some() {
let bound_new = Context::genesis().slot_new_wrapper.build_bound_method(
ctx,
class.to_owned().into(),
class,
);
class.set_attr(identifier!(ctx, __new__), bound_new.into());
}
if class.slots.hash.load().map_or(0, |h| h as usize) == hash_not_implemented as usize {
class.set_attr(ctx.names.__hash__, ctx.none.clone().into());
}
class.extend_methods(class.slots.methods, ctx);
}
fn make_class(ctx: &Context) -> PyTypeRef
where
Self: StaticType + Sized,
{
(*Self::static_cell().get_or_init(|| {
let typ = Self::create_static_type();
Self::extend_class(ctx, unsafe {
// typ will be saved in static_cell
let r: &Py<PyType> = &typ;
let r: &'static Py<PyType> = std::mem::transmute(r);
r
});
typ
}))
.to_owned()
}
fn impl_extend_class(ctx: &Context, class: &'static Py<PyType>);
const METHOD_DEFS: &'static [PyMethodDef];
fn extend_slots(slots: &mut PyTypeSlots);
fn make_slots() -> PyTypeSlots {
let mut slots = PyTypeSlots {
flags: Self::TP_FLAGS,
name: Self::TP_NAME,
basicsize: Self::BASICSIZE,
doc: Self::DOC,
methods: Self::METHOD_DEFS,
..Default::default()
};
if Self::UNHASHABLE {
slots.hash.store(Some(hash_not_implemented));
}
Self::extend_slots(&mut slots);
slots
}
}