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annotate rust/hg-cpython/src/cindex.rs @ 44010:2728fcb8127c

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rust-index: make it possible to clone the struct referencing the C index If we are to hand over the C index object to other code, we need to be able to create a new python reference to it. Differential Revision: https://phab.mercurial-scm.org/D7656
author Georges Racinet <georges.racinet@octobus.net>
date Fri, 13 Dec 2019 19:52:26 +0100
parents ab3fd8077f5e
children f5d2720f3bea
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1 // cindex.rs
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2 //
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3 // Copyright 2018 Georges Racinet <gracinet@anybox.fr>
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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 to use the Index defined by the parsers C extension
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9 //!
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10 //! Ideally, we should use an Index entirely implemented in Rust,
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11 //! but this will take some time to get there.
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12
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13 use cpython::{PyClone, PyObject, PyResult, Python};
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14 use hg::{Graph, GraphError, Revision, WORKING_DIRECTORY_REVISION};
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15 use libc::c_int;
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16
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17 #[repr(C)]
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18 pub struct Revlog_CAPI {
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19 index_parents: unsafe extern "C" fn(
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20 index: *mut revlog_capi::RawPyObject,
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21 rev: c_int,
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22 ps: *mut [c_int; 2],
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23 ) -> c_int,
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24 }
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25
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26 py_capsule!(
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27 from mercurial.cext.parsers import revlog_CAPI
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28 as revlog_capi for Revlog_CAPI);
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29
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30 /// A `Graph` backed up by objects and functions from revlog.c
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31 ///
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32 /// This implementation of the `Graph` trait, relies on (pointers to)
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33 /// - the C index object (`index` member)
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34 /// - the `index_get_parents()` function (`parents` member)
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35 ///
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36 /// # Safety
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37 ///
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38 /// The C index itself is mutable, and this Rust exposition is **not
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39 /// protected by the GIL**, meaning that this construct isn't safe with respect
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40 /// to Python threads.
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41 ///
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42 /// All callers of this `Index` must acquire the GIL and must not release it
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43 /// while working.
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44 ///
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45 /// # TODO find a solution to make it GIL safe again.
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46 ///
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47 /// This is non trivial, and can wait until we have a clearer picture with
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48 /// more Rust Mercurial constructs.
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49 ///
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50 /// One possibility would be to a `GILProtectedIndex` wrapper enclosing
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51 /// a `Python<'p>` marker and have it be the one implementing the
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52 /// `Graph` trait, but this would mean the `Graph` implementor would become
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53 /// likely to change between subsequent method invocations of the `hg-core`
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54 /// objects (a serious change of the `hg-core` API):
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55 /// either exposing ways to mutate the `Graph`, or making it a non persistent
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56 /// parameter in the relevant methods that need one.
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57 ///
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58 /// Another possibility would be to introduce an abstract lock handle into
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59 /// the core API, that would be tied to `GILGuard` / `Python<'p>`
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60 /// in the case of the `cpython` crate bindings yet could leave room for other
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61 /// mechanisms in other contexts.
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62 pub struct Index {
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63 index: PyObject,
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64 capi: &'static Revlog_CAPI,
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65 }
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66
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67 impl Index {
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68 pub fn new(py: Python, index: PyObject) -> PyResult<Self> {
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69 Ok(Index {
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70 index: index,
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71 capi: unsafe { revlog_capi::retrieve(py)? },
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72 })
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73 }
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74
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75 /// return a reference to the CPython Index object in this Struct
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76 pub fn inner(&self) -> &PyObject {
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77 &self.index
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78 }
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79 }
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80
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81 impl Clone for Index {
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82 fn clone(&self) -> Self {
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83 let guard = Python::acquire_gil();
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84 Index {
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85 index: self.index.clone_ref(guard.python()),
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86 capi: self.capi,
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87 }
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88 }
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89 }
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90
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91 impl PyClone for Index {
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92 fn clone_ref(&self, py: Python) -> Self {
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93 Index {
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94 index: self.index.clone_ref(py),
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95 capi: self.capi,
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96 }
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97 }
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98 }
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99
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100 impl Graph for Index {
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101 /// wrap a call to the C extern parents function
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102 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
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103 if rev == WORKING_DIRECTORY_REVISION {
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104 return Err(GraphError::WorkingDirectoryUnsupported);
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105 }
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106 let mut res: [c_int; 2] = [0; 2];
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107 let code = unsafe {
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108 (self.capi.index_parents)(
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109 self.index.as_ptr(),
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110 rev as c_int,
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111 &mut res as *mut [c_int; 2],
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112 )
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113 };
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114 match code {
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115 0 => Ok(res),
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116 _ => Err(GraphError::ParentOutOfRange(rev)),
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117 }
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118 }
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119 }