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annotate rust/hg-cpython/src/dirstate.rs @ 43209:8b355cbef16d

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rust-cpython: mark capsule function as unsafe
author Yuya Nishihara <yuya@tcha.org>
date Sun, 13 Oct 2019 16:58:15 +0900
parents 1ca3823aeefd
children 3fec5244aff1
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1 // dirstate.rs
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2 //
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Bindings for the `hg::dirstate` module provided by the
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9 //! `hg-core` package.
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10 //!
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11 //! From Python, this will be seen as `mercurial.rustext.dirstate`
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12 mod copymap;
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13 mod dirs_multiset;
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14 mod dirstate_map;
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15 use crate::dirstate::{dirs_multiset::Dirs, dirstate_map::DirstateMap};
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16 use cpython::{
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17 exc, PyBytes, PyDict, PyErr, PyModule, PyObject, PyResult, PySequence,
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18 Python,
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19 };
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20 use hg::{
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21 utils::hg_path::HgPathBuf, DirstateEntry, DirstateParseError, EntryState,
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22 StateMap,
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23 };
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24 use libc::{c_char, c_int};
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25 #[cfg(feature = "python27")]
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26 use python27_sys::PyCapsule_Import;
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27 #[cfg(feature = "python3")]
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28 use python3_sys::PyCapsule_Import;
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29 use std::convert::TryFrom;
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30 use std::ffi::CStr;
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31 use std::mem::transmute;
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32
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33 /// C code uses a custom `dirstate_tuple` type, checks in multiple instances
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34 /// for this type, and raises a Python `Exception` if the check does not pass.
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35 /// Because this type differs only in name from the regular Python tuple, it
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36 /// would be a good idea in the near future to remove it entirely to allow
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37 /// for a pure Python tuple of the same effective structure to be used,
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38 /// rendering this type and the capsule below useless.
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39 type MakeDirstateTupleFn = unsafe extern "C" fn(
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40 state: c_char,
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41 mode: c_int,
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42 size: c_int,
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43 mtime: c_int,
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44 ) -> PyObject;
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45
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46 /// This is largely a copy/paste from cindex.rs, pending the merge of a
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47 /// `py_capsule_fn!` macro in the rust-cpython project:
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48 /// https://github.com/dgrunwald/rust-cpython/pull/169
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49 fn decapsule_make_dirstate_tuple(py: Python) -> PyResult<MakeDirstateTupleFn> {
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50 unsafe {
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51 let caps_name = CStr::from_bytes_with_nul_unchecked(
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52 b"mercurial.cext.parsers.make_dirstate_tuple_CAPI\0",
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53 );
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54 let from_caps = PyCapsule_Import(caps_name.as_ptr(), 0);
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55 if from_caps.is_null() {
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56 return Err(PyErr::fetch(py));
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57 }
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58 Ok(transmute(from_caps))
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59 }
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60 }
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61
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62 pub fn make_dirstate_tuple(
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63 py: Python,
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64 entry: &DirstateEntry,
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65 ) -> PyResult<PyObject> {
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66 let make = decapsule_make_dirstate_tuple(py)?;
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67
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68 let &DirstateEntry {
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69 state,
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70 mode,
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71 size,
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72 mtime,
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73 } = entry;
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74 // Explicitly go through u8 first, then cast to platform-specific `c_char`
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75 // because Into<u8> has a specific implementation while `as c_char` would
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76 // just do a naive enum cast.
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77 let state_code: u8 = state.into();
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78
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79 unsafe {
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80 let ptr = make(state_code as c_char, mode, size, mtime);
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81 Ok(ptr)
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82 }
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83 }
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84
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85 pub fn extract_dirstate(py: Python, dmap: &PyDict) -> Result<StateMap, PyErr> {
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86 dmap.items(py)
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87 .iter()
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88 .map(|(filename, stats)| {
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89 let stats = stats.extract::<PySequence>(py)?;
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90 let state = stats.get_item(py, 0)?.extract::<PyBytes>(py)?;
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91 let state = EntryState::try_from(state.data(py)[0]).map_err(
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92 |e: DirstateParseError| {
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93 PyErr::new::<exc::ValueError, _>(py, e.to_string())
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94 },
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95 )?;
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96 let mode = stats.get_item(py, 1)?.extract(py)?;
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97 let size = stats.get_item(py, 2)?.extract(py)?;
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98 let mtime = stats.get_item(py, 3)?.extract(py)?;
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99 let filename = filename.extract::<PyBytes>(py)?;
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100 let filename = filename.data(py);
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101 Ok((
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102 HgPathBuf::from(filename.to_owned()),
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103 DirstateEntry {
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104 state,
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105 mode,
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106 size,
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107 mtime,
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108 },
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109 ))
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110 })
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111 .collect()
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112 }
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113
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114 /// Create the module, with `__package__` given from parent
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115 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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116 let dotted_name = &format!("{}.dirstate", package);
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117 let m = PyModule::new(py, dotted_name)?;
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118
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119 m.add(py, "__package__", package)?;
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120 m.add(py, "__doc__", "Dirstate - Rust implementation")?;
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121
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122 m.add_class::<Dirs>(py)?;
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123 m.add_class::<DirstateMap>(py)?;
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124
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125 let sys = PyModule::import(py, "sys")?;
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126 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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127 sys_modules.set_item(py, dotted_name, &m)?;
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128
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129 Ok(m)
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130 }