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annotate rust/hg-cpython/src/pybytes_deref.rs @ 52167:7be39c5110c9

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hg-core: add a complete VFS This will be used from Python in a later change. More changes are needed in hg-core and rhg to properly clean up the APIs of the old VFS implementation but it can be done when the dust settles and we start adding more functionality to the pure Rust VFS.
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 29 Jul 2024 20:47:43 +0200
parents 7346f93be7a4
children d9d6ae9b9722
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rev   line source
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1 use crate::cpython::buffer::Element;
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2 use cpython::{
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3 buffer::PyBuffer, exc::ValueError, PyBytes, PyErr, PyResult, Python,
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4 };
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5 use stable_deref_trait::StableDeref;
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6
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7 /// Safe abstraction over a `PyBytes` together with the `&[u8]` slice
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8 /// that borrows it. Implements `Deref<Target = [u8]>`.
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9 ///
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10 /// Calling `PyBytes::data` requires a GIL marker but we want to access the
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11 /// data in a thread that (ideally) does not need to acquire the GIL.
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12 /// This type allows separating the call an the use.
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13 ///
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14 /// It also enables using a (wrapped) `PyBytes` in GIL-unaware generic code.
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15 pub struct PyBytesDeref {
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16 #[allow(unused)]
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17 keep_alive: PyBytes,
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18
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19 /// Borrows the buffer inside `self.keep_alive`,
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20 /// but the borrow-checker cannot express self-referential structs.
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21 data: *const [u8],
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22 }
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23
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24 impl PyBytesDeref {
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25 pub fn new(py: Python, bytes: PyBytes) -> Self {
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26 Self {
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27 data: bytes.data(py),
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28 keep_alive: bytes,
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29 }
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30 }
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31
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32 pub fn unwrap(self) -> PyBytes {
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33 self.keep_alive
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34 }
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35 }
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36
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37 impl std::ops::Deref for PyBytesDeref {
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38 type Target = [u8];
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39
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40 fn deref(&self) -> &[u8] {
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41 // Safety: the raw pointer is valid as long as the PyBytes is still
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42 // alive, and the returned slice borrows `self`.
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43 unsafe { &*self.data }
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44 }
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45 }
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46
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47 unsafe impl StableDeref for PyBytesDeref {}
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48
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49 fn require_send<T: Send>() {}
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50
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51 #[allow(unused)]
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52 fn static_assert_pybytes_is_send() {
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53 #[allow(clippy::no_effect)]
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54 require_send::<PyBytes>;
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55 }
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56
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57 // Safety: PyBytes is Send. Raw pointers are not by default,
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58 // but here sending one to another thread is fine since we ensure it stays
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59 // valid.
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60 unsafe impl Send for PyBytesDeref {}
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61
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62 ///
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63 /// It also enables using a (wrapped) `PyBuffer` in GIL-unaware generic code.
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64 pub struct PyBufferDeref {
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65 #[allow(unused)]
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66 keep_alive: PyBuffer,
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67
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68 /// Borrows the buffer inside `self.keep_alive`,
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69 /// but the borrow-checker cannot express self-referential structs.
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70 data: *const [u8],
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71 }
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72
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73 fn get_buffer<'a>(py: Python, buf: &'a PyBuffer) -> PyResult<&'a [u8]> {
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74 let len = buf.item_count();
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75
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76 let cbuf = buf.buf_ptr();
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77 let has_correct_item_size = std::mem::size_of::<u8>() == buf.item_size();
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78 let is_valid_buffer = has_correct_item_size
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79 && buf.is_c_contiguous()
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80 && u8::is_compatible_format(buf.format())
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81 && buf.readonly();
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82
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83 let bytes = if is_valid_buffer {
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84 unsafe { std::slice::from_raw_parts(cbuf as *const u8, len) }
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85 } else {
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86 return Err(PyErr::new::<ValueError, _>(
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87 py,
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88 "Buffer has an invalid memory representation",
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89 ));
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90 };
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91 Ok(bytes)
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92 }
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93
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94 impl PyBufferDeref {
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95 pub fn new(py: Python, buf: PyBuffer) -> PyResult<Self> {
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96 Ok(Self {
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97 data: get_buffer(py, &buf)?,
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98 keep_alive: buf,
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99 })
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100 }
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101 }
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102
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103 impl std::ops::Deref for PyBufferDeref {
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104 type Target = [u8];
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105
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106 fn deref(&self) -> &[u8] {
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107 // Safety: the raw pointer is valid as long as the PyBuffer is still
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108 // alive, and the returned slice borrows `self`.
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109 unsafe { &*self.data }
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110 }
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111 }
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112
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113 unsafe impl StableDeref for PyBufferDeref {}
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114
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115 #[allow(unused)]
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116 fn static_assert_pybuffer_is_send() {
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117 #[allow(clippy::no_effect)]
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118 require_send::<PyBuffer>;
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119 }
7346f93be7a4 revlog: add the glue to use the Rust `InnerRevlog` from Python
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49933
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120
7346f93be7a4 revlog: add the glue to use the Rust `InnerRevlog` from Python
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49933
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121 // Safety: PyBuffer is Send. Raw pointers are not by default,
7346f93be7a4 revlog: add the glue to use the Rust `InnerRevlog` from Python
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49933
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122 // but here sending one to another thread is fine since we ensure it stays
7346f93be7a4 revlog: add the glue to use the Rust `InnerRevlog` from Python
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49933
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123 // valid.
7346f93be7a4 revlog: add the glue to use the Rust `InnerRevlog` from Python
Rapha?l Gom?s <rgomes@octobus.net>
parents: 49933
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124 unsafe impl Send for PyBufferDeref {}