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annotate rust/hg-cpython/src/cindex.rs @ 48852:e633e660158f

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revlog: implement fast_rank retrieval in C This will be useful in particular to avoid going through the Python interpreter in native Rust functions. Differential Revision: https://phab.mercurial-scm.org/D12209
author pacien <pacien.trangirard@pacien.net>
date Mon, 21 Feb 2022 18:05:54 +0100
parents 8e8737a1fa7d
children 4346be456875
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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::{
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14 exc::ImportError, exc::TypeError, ObjectProtocol, PyClone, PyErr,
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15 PyObject, PyResult, PyTuple, Python, PythonObject,
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16 };
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17 use hg::revlog::{Node, RevlogIndex};
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18 use hg::{Graph, GraphError, Revision, WORKING_DIRECTORY_REVISION};
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19 use libc::{c_int, ssize_t};
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20
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21 const REVLOG_CABI_VERSION: c_int = 3;
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22
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23 #[repr(C)]
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24 pub struct Revlog_CAPI {
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25 abi_version: c_int,
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26 index_length:
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27 unsafe extern "C" fn(index: *mut revlog_capi::RawPyObject) -> ssize_t,
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28 index_node: unsafe extern "C" fn(
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29 index: *mut revlog_capi::RawPyObject,
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30 rev: ssize_t,
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31 ) -> *const Node,
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32 fast_rank: unsafe extern "C" fn(
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33 index: *mut revlog_capi::RawPyObject,
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34 rev: ssize_t,
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35 ) -> ssize_t,
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36 index_parents: unsafe extern "C" fn(
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37 index: *mut revlog_capi::RawPyObject,
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38 rev: c_int,
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39 ps: *mut [c_int; 2],
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40 ) -> c_int,
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41 }
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42
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43 py_capsule!(
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44 from mercurial.cext.parsers import revlog_CAPI
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45 as revlog_capi for Revlog_CAPI);
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46
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47 /// A `Graph` backed up by objects and functions from revlog.c
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48 ///
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49 /// This implementation of the `Graph` trait, relies on (pointers to)
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50 /// - the C index object (`index` member)
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51 /// - the `index_get_parents()` function (`parents` member)
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52 ///
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53 /// # Safety
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54 ///
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55 /// The C index itself is mutable, and this Rust exposition is **not
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56 /// protected by the GIL**, meaning that this construct isn't safe with respect
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57 /// to Python threads.
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58 ///
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59 /// All callers of this `Index` must acquire the GIL and must not release it
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60 /// while working.
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61 ///
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62 /// # TODO find a solution to make it GIL safe again.
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63 ///
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64 /// This is non trivial, and can wait until we have a clearer picture with
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65 /// more Rust Mercurial constructs.
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66 ///
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67 /// One possibility would be to a `GILProtectedIndex` wrapper enclosing
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68 /// a `Python<'p>` marker and have it be the one implementing the
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69 /// `Graph` trait, but this would mean the `Graph` implementor would become
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70 /// likely to change between subsequent method invocations of the `hg-core`
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71 /// objects (a serious change of the `hg-core` API):
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72 /// either exposing ways to mutate the `Graph`, or making it a non persistent
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73 /// parameter in the relevant methods that need one.
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74 ///
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75 /// Another possibility would be to introduce an abstract lock handle into
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76 /// the core API, that would be tied to `GILGuard` / `Python<'p>`
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77 /// in the case of the `cpython` crate bindings yet could leave room for other
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78 /// mechanisms in other contexts.
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79 pub struct Index {
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80 index: PyObject,
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81 capi: &'static Revlog_CAPI,
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82 }
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83
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84 impl Index {
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85 pub fn new(py: Python, index: PyObject) -> PyResult<Self> {
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86 let capi = unsafe { revlog_capi::retrieve(py)? };
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87 if capi.abi_version != REVLOG_CABI_VERSION {
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88 return Err(PyErr::new::<ImportError, _>(
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89 py,
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90 format!(
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91 "ABI version mismatch: the C ABI revlog version {} \
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92 does not match the {} expected by Rust hg-cpython",
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93 capi.abi_version, REVLOG_CABI_VERSION
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94 ),
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95 ));
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96 }
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97 let compat: u64 = index.getattr(py, "rust_ext_compat")?.extract(py)?;
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98 if compat == 0 {
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99 return Err(PyErr::new::<TypeError, _>(
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100 py,
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101 "index object not compatible with Rust",
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102 ));
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103 }
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104 Ok(Index { index, capi })
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105 }
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106
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107 /// return a reference to the CPython Index object in this Struct
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108 pub fn inner(&self) -> &PyObject {
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109 &self.index
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110 }
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111
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112 pub fn append(&mut self, py: Python, tup: PyTuple) -> PyResult<PyObject> {
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113 self.index.call_method(
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114 py,
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115 "append",
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116 PyTuple::new(py, &[tup.into_object()]),
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117 None,
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118 )
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119 }
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120 }
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121
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122 impl Clone for Index {
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123 fn clone(&self) -> Self {
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124 let guard = Python::acquire_gil();
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125 Index {
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126 index: self.index.clone_ref(guard.python()),
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127 capi: self.capi,
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128 }
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129 }
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130 }
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131
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132 impl PyClone for Index {
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133 fn clone_ref(&self, py: Python) -> Self {
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134 Index {
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135 index: self.index.clone_ref(py),
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136 capi: self.capi,
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137 }
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138 }
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139 }
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140
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141 impl Graph for Index {
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142 /// wrap a call to the C extern parents function
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143 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
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144 if rev == WORKING_DIRECTORY_REVISION {
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145 return Err(GraphError::WorkingDirectoryUnsupported);
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146 }
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147 let mut res: [c_int; 2] = [0; 2];
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148 let code = unsafe {
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149 (self.capi.index_parents)(
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150 self.index.as_ptr(),
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151 rev as c_int,
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152 &mut res as *mut [c_int; 2],
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153 )
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154 };
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155 match code {
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156 0 => Ok(res),
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157 _ => Err(GraphError::ParentOutOfRange(rev)),
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158 }
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159 }
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160 }
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161
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162 impl vcsgraph::graph::Graph for Index {
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163 fn parents(
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164 &self,
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165 rev: Revision,
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166 ) -> Result<vcsgraph::graph::Parents, vcsgraph::graph::GraphReadError>
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167 {
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168 match Graph::parents(self, rev) {
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169 Ok(parents) => Ok(vcsgraph::graph::Parents(parents)),
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170 Err(GraphError::ParentOutOfRange(rev)) => {
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171 Err(vcsgraph::graph::GraphReadError::KeyedInvalidKey(rev))
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172 }
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173 Err(GraphError::WorkingDirectoryUnsupported) => Err(
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174 vcsgraph::graph::GraphReadError::WorkingDirectoryUnsupported,
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175 ),
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176 }
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177 }
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178 }
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179
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180 impl RevlogIndex for Index {
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181 /// Note C return type is Py_ssize_t (hence signed), but we shall
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182 /// force it to unsigned, because it's a length
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183 fn len(&self) -> usize {
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184 unsafe { (self.capi.index_length)(self.index.as_ptr()) as usize }
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185 }
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186
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187 fn node(&self, rev: Revision) -> Option<&Node> {
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188 let raw = unsafe {
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189 (self.capi.index_node)(self.index.as_ptr(), rev as ssize_t)
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190 };
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191 if raw.is_null() {
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192 None
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193 } else {
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194 // TODO it would be much better for the C layer to give us
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195 // a length, since the hash length will change in the near
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196 // future, but that's probably out of scope for the nodemap
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197 // patch series.
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198 //
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199 // The root of that unsafety relies in the signature of
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200 // `capi.index_node()` itself: returning a `Node` pointer
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201 // whereas it's a `char *` in the C counterpart.
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202 Some(unsafe { &*raw })
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203 }
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204 }
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205 }