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annotate rust/hg-cpython/src/cindex.rs @ 44066:f5d2720f3bea

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revlog-native: introduced ABI version in capsule Concerns that an inconsistency could arise between the actual contents of the capsule in revlog.c and the Rust consumer have been raised after the switch to the array of data and function pointers in f384d68d8ea8. It has been suggested that the `version` from parsers.c could be use for this. In this change, we introduce instead a separate ABI version number, which should have the following advantages: - no need to change the consuming Rust code for changes that have nothing to do with the contents of the capsule - the version number in parsers.c is not explicitely flagged as ABI. It's not obvious to me whether an ABI change that would be invisible to Python would warrant an increment The drawback is that developers now have to consider two version numbers. We expect the added cost of the check to be negligible because it occurs at instantiation of `CIndex` only, which in turn is tied to instantiation of Python objects such as `LazyAncestors` and `MixedIndex`. Frequent calls to `Cindex::new` should also probably hit the CPU branch predictor. Differential Revision: https://phab.mercurial-scm.org/D7856
author Georges Racinet <georges.racinet@octobus.net>
date Tue, 14 Jan 2020 12:04:12 +0100
parents 2728fcb8127c
children 166349510398
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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::{exc::ImportError, PyClone, PyErr, 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 const REVLOG_CABI_VERSION: c_int = 1;
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18
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19 #[repr(C)]
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20 pub struct Revlog_CAPI {
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21 abi_version: c_int,
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22 index_parents: unsafe extern "C" fn(
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23 index: *mut revlog_capi::RawPyObject,
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24 rev: c_int,
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25 ps: *mut [c_int; 2],
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26 ) -> c_int,
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27 }
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28
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29 py_capsule!(
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30 from mercurial.cext.parsers import revlog_CAPI
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31 as revlog_capi for Revlog_CAPI);
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32
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33 /// A `Graph` backed up by objects and functions from revlog.c
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34 ///
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35 /// This implementation of the `Graph` trait, relies on (pointers to)
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36 /// - the C index object (`index` member)
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37 /// - the `index_get_parents()` function (`parents` member)
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38 ///
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39 /// # Safety
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40 ///
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41 /// The C index itself is mutable, and this Rust exposition is **not
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42 /// protected by the GIL**, meaning that this construct isn't safe with respect
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43 /// to Python threads.
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44 ///
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45 /// All callers of this `Index` must acquire the GIL and must not release it
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46 /// while working.
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47 ///
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48 /// # TODO find a solution to make it GIL safe again.
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49 ///
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50 /// This is non trivial, and can wait until we have a clearer picture with
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51 /// more Rust Mercurial constructs.
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52 ///
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53 /// One possibility would be to a `GILProtectedIndex` wrapper enclosing
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54 /// a `Python<'p>` marker and have it be the one implementing the
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55 /// `Graph` trait, but this would mean the `Graph` implementor would become
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56 /// likely to change between subsequent method invocations of the `hg-core`
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57 /// objects (a serious change of the `hg-core` API):
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58 /// either exposing ways to mutate the `Graph`, or making it a non persistent
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59 /// parameter in the relevant methods that need one.
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60 ///
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61 /// Another possibility would be to introduce an abstract lock handle into
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62 /// the core API, that would be tied to `GILGuard` / `Python<'p>`
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63 /// in the case of the `cpython` crate bindings yet could leave room for other
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64 /// mechanisms in other contexts.
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65 pub struct Index {
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66 index: PyObject,
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67 capi: &'static Revlog_CAPI,
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68 }
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69
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70 impl Index {
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71 pub fn new(py: Python, index: PyObject) -> PyResult<Self> {
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72 let capi = unsafe { revlog_capi::retrieve(py)? };
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73 if capi.abi_version != REVLOG_CABI_VERSION {
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74 return Err(PyErr::new::<ImportError, _>(
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75 py,
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76 format!(
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77 "ABI version mismatch: the C ABI revlog version {} \
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78 does not match the {} expected by Rust hg-cpython",
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79 capi.abi_version, REVLOG_CABI_VERSION
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80 ),
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81 ));
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82 }
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83 Ok(Index {
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84 index: index,
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85 capi: capi,
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86 })
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87 }
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88
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89 /// return a reference to the CPython Index object in this Struct
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90 pub fn inner(&self) -> &PyObject {
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91 &self.index
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92 }
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93 }
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94
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95 impl Clone for Index {
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96 fn clone(&self) -> Self {
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97 let guard = Python::acquire_gil();
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98 Index {
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99 index: self.index.clone_ref(guard.python()),
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100 capi: self.capi,
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101 }
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102 }
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103 }
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104
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105 impl PyClone for Index {
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106 fn clone_ref(&self, py: Python) -> Self {
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107 Index {
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108 index: self.index.clone_ref(py),
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109 capi: self.capi,
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110 }
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111 }
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112 }
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113
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114 impl Graph for Index {
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115 /// wrap a call to the C extern parents function
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116 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
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117 if rev == WORKING_DIRECTORY_REVISION {
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118 return Err(GraphError::WorkingDirectoryUnsupported);
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119 }
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120 let mut res: [c_int; 2] = [0; 2];
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121 let code = unsafe {
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122 (self.capi.index_parents)(
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123 self.index.as_ptr(),
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124 rev as c_int,
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125 &mut res as *mut [c_int; 2],
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126 )
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127 };
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128 match code {
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129 0 => Ok(res),
4c25038c112c rust-cpython: implement Graph using C parents function
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parents:
diff changeset
130 _ => Err(GraphError::ParentOutOfRange(rev)),
4c25038c112c rust-cpython: implement Graph using C parents function
Georges Racinet <gracinet@anybox.fr>
parents:
diff changeset
131 }
4c25038c112c rust-cpython: implement Graph using C parents function
Georges Racinet <gracinet@anybox.fr>
parents:
diff changeset
132 }
4c25038c112c rust-cpython: implement Graph using C parents function
Georges Racinet <gracinet@anybox.fr>
parents:
diff changeset
133 }