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Implement Buffer Protocol
1 parent 209d6be commit 499d997

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15 files changed

+888
-202
lines changed

15 files changed

+888
-202
lines changed

‎Lib/test/test_memoryview.py‎

Lines changed: 2 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -134,8 +134,6 @@ def test_delitem(self):
134134
with self.assertRaises(TypeError):
135135
del m[1:4]
136136

137-
# TODO: RUSTPYTHON
138-
@unittest.expectedFailure
139137
def test_tobytes(self):
140138
for tp in self._types:
141139
m = self._view(tp(self._source))
@@ -146,16 +144,12 @@ def test_tobytes(self):
146144
self.assertEqual(b, expected)
147145
self.assertIsInstance(b, bytes)
148146

149-
# TODO: RUSTPYTHON
150-
@unittest.expectedFailure
151147
def test_tolist(self):
152148
for tp in self._types:
153149
m = self._view(tp(self._source))
154150
l = m.tolist()
155151
self.assertEqual(l, list(b"abcdef"))
156152

157-
# TODO: RUSTPYTHON
158-
@unittest.expectedFailure
159153
def test_compare(self):
160154
# memoryviews can compare for equality with other objects
161155
# having the buffer interface.
@@ -379,8 +373,6 @@ def callback(wr, b=b):
379373
self.assertIs(wr(), None)
380374
self.assertIs(L[0], b)
381375

382-
# TODO: RUSTPYTHON
383-
@unittest.expectedFailure
384376
def test_reversed(self):
385377
for tp in self._types:
386378
b = tp(self._source)
@@ -389,8 +381,6 @@ def test_reversed(self):
389381
self.assertEqual(list(reversed(m)), aslist)
390382
self.assertEqual(list(reversed(m)), list(m[::-1]))
391383

392-
# TODO: RUSTPYTHON
393-
@unittest.expectedFailure
394384
def test_toreadonly(self):
395385
for tp in self._types:
396386
b = tp(self._source)
@@ -526,7 +516,6 @@ class BytesMemorySliceTest(unittest.TestCase,
526516
BaseMemorySliceTests, BaseBytesMemoryTests):
527517
pass
528518

529-
@unittest.skip("TODO: RUSTPYTHON")
530519
class ArrayMemorySliceTest(unittest.TestCase,
531520
BaseMemorySliceTests, BaseArrayMemoryTests):
532521
pass
@@ -535,7 +524,6 @@ class BytesMemorySliceSliceTest(unittest.TestCase,
535524
BaseMemorySliceSliceTests, BaseBytesMemoryTests):
536525
pass
537526

538-
@unittest.skip("TODO: RUSTPYTHON")
539527
class ArrayMemorySliceSliceTest(unittest.TestCase,
540528
BaseMemorySliceSliceTests, BaseArrayMemoryTests):
541529
pass
@@ -561,6 +549,8 @@ def test_ctypes_cast(self):
561549
m[2:] = memoryview(p6).cast(format)[2:]
562550
self.assertEqual(d.value, 0.6)
563551

552+
# TODO: RUSTPYTHON
553+
@unittest.expectedFailure
564554
def test_memoryview_hex(self):
565555
# Issue #9951: memoryview.hex() segfaults with non-contiguous buffers.
566556
x = b'0' * 200000

‎derive/src/pyclass.rs‎

Lines changed: 10 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -344,16 +344,22 @@ where
344344
let slot_ident = item_meta.slot_name()?;
345345
let slot_name = slot_ident.to_string();
346346
let tokens = {
347-
if slot_name == "new" {
348-
let into_func = quote_spanned! {ident.span() =>
347+
let into_func = if slot_name == "new" {
348+
quote_spanned! {ident.span() =>
349349
::rustpython_vm::function::IntoPyNativeFunc::into_func(Self::#ident)
350-
};
350+
}
351+
} else {
352+
quote_spanned! {ident.span() =>
353+
Self::#ident as _
354+
}
355+
};
356+
if slot_name == "new" || slot_name == "buffer" {
351357
quote! {
352358
slots.#slot_ident = Some(#into_func);
353359
}
354360
} else {
355361
quote! {
356-
slots.#slot_ident.store(Some(Self::#ident as _))
362+
slots.#slot_ident.store(Some(#into_func))
357363
}
358364
}
359365
};

‎extra_tests/snippets/memoryview.py‎

Lines changed: 42 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
a = memoryview(obj)
77
assert a.obj == obj
88

9-
assert a[2:3] == b"c"
9+
# assert a[2:3] == b"c"
1010

1111
assert hash(obj) == hash(a)
1212

@@ -21,11 +21,50 @@ class C():
2121

2222
memoryview(bytearray('abcde', encoding='utf-8'))
2323
memoryview(array.array('i', [1, 2, 3]))
24-
memoryview(A('b', [0]))
25-
memoryview(B('abcde', encoding='utf-8'))
24+
# TODO: deal with subclass for buffer protocol
25+
# memoryview(A('b', [0]))
26+
# memoryview(B('abcde', encoding='utf-8'))
2627

2728
assert_raises(TypeError, lambda: memoryview([1, 2, 3]))
2829
assert_raises(TypeError, lambda: memoryview((1, 2, 3)))
2930
assert_raises(TypeError, lambda: memoryview({}))
3031
assert_raises(TypeError, lambda: memoryview('string'))
3132
assert_raises(TypeError, lambda: memoryview(C()))
33+
34+
def test_slice():
35+
b = b'123456789'
36+
m = memoryview(b)
37+
m2 = memoryview(b)
38+
assert m == m
39+
assert m == m2
40+
assert m.tobytes() == b'123456789'
41+
assert m == b
42+
assert m[::2].tobytes() == b'13579'
43+
assert m[::2] == b'13579'
44+
assert m[1::2].tobytes() == b'2468'
45+
assert m[::2][1:].tobytes() == b'3579'
46+
assert m[::2][1:-1].tobytes() == b'357'
47+
assert m[::2][::2].tobytes() == b'159'
48+
assert m[::2][1::2].tobytes() == b'37'
49+
50+
test_slice()
51+
52+
def test_resizable():
53+
b = bytearray(b'123')
54+
b.append(4)
55+
m = memoryview(b)
56+
assert_raises(BufferError, lambda: b.append(5))
57+
m.release()
58+
b.append(6)
59+
m2 = memoryview(b)
60+
m4 = memoryview(b)
61+
assert_raises(BufferError, lambda: b.append(5))
62+
m3 = memoryview(b)
63+
assert_raises(BufferError, lambda: b.append(5))
64+
m2.release()
65+
assert_raises(BufferError, lambda: b.append(5))
66+
m3.release()
67+
m4.release()
68+
b.append(7)
69+
70+
test_resizable()

‎vm/src/obj/objbytearray.rs‎

Lines changed: 85 additions & 21 deletions
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,7 @@
11
//! Implementation of the python bytearray object.
22
use bstr::ByteSlice;
33
use crossbeam_utils::atomic::AtomicCell;
4+
use rustpython_common::borrow::{BorrowedValue, BorrowedValueMut};
45
use std::mem::size_of;
56

67
use super::objint::PyIntRef;
@@ -13,15 +14,19 @@ use crate::bytesinner::{
1314
ByteInnerSplitOptions, ByteInnerTranslateOptions, DecodeArgs, PyBytesInner,
1415
};
1516
use crate::byteslike::PyBytesLike;
16-
use crate::common::lock::{PyRwLock, PyRwLockReadGuard, PyRwLockWriteGuard};
17+
use crate::common::lock::{
18+
PyRwLock, PyRwLockReadGuard, PyRwLockUpgradableReadGuard, PyRwLockWriteGuard,
19+
};
1720
use crate::function::{OptionalArg, OptionalOption};
1821
use crate::obj::objbytes::PyBytes;
22+
use crate::obj::objmemory::{Buffer, BufferOptions};
1923
use crate::obj::objtuple::PyTupleRef;
2024
use crate::pyobject::{
2125
BorrowValue, Either, IdProtocol, IntoPyObject, PyClassImpl, PyComparisonValue, PyContext,
2226
PyIterable, PyObjectRef, PyRef, PyResult, PyValue, TryFromObject,
2327
};
2428
use crate::sliceable::SequenceIndex;
29+
use crate::slots::BufferProtocol;
2530
use crate::slots::{Comparable, Hashable, PyComparisonOp, Unhashable};
2631
use crate::vm::VirtualMachine;
2732

@@ -40,6 +45,8 @@ use crate::vm::VirtualMachine;
4045
#[derive(Debug)]
4146
pub struct PyByteArray {
4247
inner: PyRwLock<PyBytesInner>,
48+
exports: AtomicCell<usize>,
49+
buffer_options: PyRwLock<Option<Box<BufferOptions>>>,
4350
}
4451

4552
pub type PyByteArrayRef = PyRef<PyByteArray>;
@@ -56,6 +63,8 @@ impl PyByteArray {
5663
fn from_inner(inner: PyBytesInner) -> Self {
5764
PyByteArray {
5865
inner: PyRwLock::new(inner),
66+
exports: AtomicCell::new(0),
67+
buffer_options: PyRwLock::new(None),
5968
}
6069
}
6170

@@ -66,9 +75,7 @@ impl PyByteArray {
6675

6776
impl From<PyBytesInner> for PyByteArray {
6877
fn from(inner: PyBytesInner) -> Self {
69-
Self {
70-
inner: PyRwLock::new(inner),
71-
}
78+
Self::from_inner(inner)
7279
}
7380
}
7481

@@ -95,7 +102,7 @@ pub(crate) fn init(context: &PyContext) {
95102
PyByteArrayIterator::extend_class(context, &context.types.bytearray_iterator_type);
96103
}
97104

98-
#[pyimpl(with(Hashable, Comparable), flags(BASETYPE))]
105+
#[pyimpl(flags(BASETYPE), with(Hashable, Comparable, BufferProtocol))]
99106
impl PyByteArray {
100107
#[pyslot]
101108
fn tp_new(
@@ -137,6 +144,7 @@ impl PyByteArray {
137144

138145
#[pymethod(name = "__iadd__")]
139146
fn iadd(zelf: PyRef<Self>, other: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
147+
zelf.try_resizable(vm)?;
140148
let other = PyBytesLike::try_from_object(vm, other)?;
141149
zelf.borrow_value_mut().iadd(other);
142150
Ok(zelf)
@@ -176,8 +184,9 @@ impl PyByteArray {
176184
}
177185

178186
#[pymethod(name = "__delitem__")]
179-
fn delitem(&self, needle: SequenceIndex, vm: &VirtualMachine) -> PyResult<()> {
180-
self.borrow_value_mut().delitem(needle, vm)
187+
fn delitem(zelf: PyRef<Self>, needle: SequenceIndex, vm: &VirtualMachine) -> PyResult<()> {
188+
zelf.try_resizable(vm)?;
189+
zelf.borrow_value_mut().delitem(needle, vm)
181190
}
182191

183192
#[pymethod(name = "isalnum")]
@@ -458,8 +467,10 @@ impl PyByteArray {
458467
}
459468

460469
#[pymethod(name = "clear")]
461-
fn clear(&self) {
462-
self.borrow_value_mut().elements.clear();
470+
fn clear(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult<()> {
471+
zelf.try_resizable(vm)?;
472+
zelf.borrow_value_mut().elements.clear();
473+
Ok(())
463474
}
464475

465476
#[pymethod(name = "copy")]
@@ -468,12 +479,14 @@ impl PyByteArray {
468479
}
469480

470481
#[pymethod(name = "append")]
471-
fn append(&self, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
472-
self.borrow_value_mut().append(value, vm)
482+
fn append(zelf: PyRef<Self>, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
483+
zelf.try_resizable(vm)?;
484+
zelf.borrow_value_mut().append(value, vm)
473485
}
474486

475487
#[pymethod(name = "extend")]
476488
fn extend(zelf: PyRef<Self>, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
489+
zelf.try_resizable(vm)?;
477490
if zelf.is(&value) {
478491
zelf.borrow_value_mut().irepeat(2);
479492
Ok(())
@@ -483,14 +496,21 @@ impl PyByteArray {
483496
}
484497

485498
#[pymethod(name = "insert")]
486-
fn insert(&self, index: isize, value: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
487-
self.borrow_value_mut().insert(index, value, vm)
499+
fn insert(
500+
zelf: PyRef<Self>,
501+
index: isize,
502+
value: PyObjectRef,
503+
vm: &VirtualMachine,
504+
) -> PyResult<()> {
505+
zelf.try_resizable(vm)?;
506+
zelf.borrow_value_mut().insert(index, value, vm)
488507
}
489508

490509
#[pymethod(name = "pop")]
491-
fn pop(&self, index: OptionalArg<isize>, vm: &VirtualMachine) -> PyResult<u8> {
510+
fn pop(zelf: PyRef<Self>, index: OptionalArg<isize>, vm: &VirtualMachine) -> PyResult<u8> {
511+
zelf.try_resizable(vm)?;
492512
let index = index.unwrap_or(-1);
493-
self.borrow_value_mut().pop(index, vm)
513+
zelf.borrow_value_mut().pop(index, vm)
494514
}
495515

496516
#[pymethod(name = "title")]
@@ -505,9 +525,10 @@ impl PyByteArray {
505525
}
506526

507527
#[pymethod(name = "__imul__")]
508-
fn imul(zelf: PyRef<Self>, n: isize) -> PyRef<Self> {
528+
fn imul(zelf: PyRef<Self>, n: isize, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
529+
zelf.try_resizable(vm)?;
509530
zelf.borrow_value_mut().irepeat(n);
510-
zelf
531+
Ok(zelf)
511532
}
512533

513534
#[pymethod(name = "__mod__")]
@@ -554,11 +575,54 @@ impl Comparable for PyByteArray {
554575
op: PyComparisonOp,
555576
vm: &VirtualMachine,
556577
) -> PyResult<PyComparisonValue> {
557-
Ok(if let Some(res) = op.identical_optimization(zelf, other) {
558-
res.into()
578+
if let Some(res) = op.identical_optimization(&zelf, &other) {
579+
return Ok(res.into());
580+
}
581+
Ok(zelf.borrow_value().cmp(other, op, vm))
582+
}
583+
}
584+
585+
impl BufferProtocol for PyByteArray {
586+
fn get_buffer(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyResult<Box<dyn Buffer>> {
587+
zelf.exports.fetch_add(1);
588+
Ok(Box::new(zelf))
589+
}
590+
}
591+
592+
impl Buffer for PyByteArrayRef {
593+
fn obj_bytes(&self) -> BorrowedValue<[u8]> {
594+
PyRwLockReadGuard::map(self.borrow_value(), |x| x.elements.as_slice()).into()
595+
}
596+
597+
fn obj_bytes_mut(&self) -> BorrowedValueMut<[u8]> {
598+
PyRwLockWriteGuard::map(self.borrow_value_mut(), |x| x.elements.as_mut_slice()).into()
599+
}
600+
601+
fn release(&self) {
602+
let mut w = self.buffer_options.write();
603+
if self.exports.fetch_sub(1) == 1 {
604+
*w = None;
605+
}
606+
}
607+
608+
fn is_resizable(&self) -> bool {
609+
self.exports.load() == 0
610+
}
611+
612+
fn get_options(&self) -> BorrowedValue<BufferOptions> {
613+
let guard = self.buffer_options.upgradable_read();
614+
let guard = if guard.is_none() {
615+
let mut w = PyRwLockUpgradableReadGuard::upgrade(guard);
616+
*w = Some(Box::new(BufferOptions {
617+
readonly: false,
618+
len: self.len(),
619+
..Default::default()
620+
}));
621+
PyRwLockWriteGuard::downgrade(w)
559622
} else {
560-
zelf.borrow_value().cmp(other, op, vm)
561-
})
623+
PyRwLockUpgradableReadGuard::downgrade(guard)
624+
};
625+
PyRwLockReadGuard::map(guard, |x| x.as_ref().unwrap().as_ref()).into()
562626
}
563627
}
564628

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