Mercurial > hg
annotate rust/README.rst @ 50976:9929c8a73488
rust-revlog: split logic for `rawdata` to prepare for `UncheckedRevision` use
In the next changeset, we will change the logic to use `UncheckedRevision`
in the non-general delta case. The general delta case will use the "checked"
path since `base_rev_or_base_of_delta_chain` will be checked.
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Mon, 11 Sep 2023 11:52:33 +0200 |
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1 =================== |
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2 Mercurial Rust Code |
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3 =================== |
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4 |
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5 This directory contains various Rust code for the Mercurial project. |
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6 Rust is not required to use (or build) Mercurial, but using it |
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7 improves performance in some areas. |
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8 |
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9 There are currently four independent Rust projects: |
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10 |
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11 - chg. An implementation of chg, in Rust instead of C. |
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12 - hgcli. A project that provides a (mostly) self-contained "hg" binary, |
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13 for ease of deployment and a bit of speed, using PyOxidizer. See |
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14 ``hgcli/README.md``. |
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15 - hg-core (and hg-cpython): implementation of some |
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16 functionality of mercurial in Rust, e.g. ancestry computations in |
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17 revision graphs, status or pull discovery. The top-level ``Cargo.toml`` file |
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18 defines a workspace containing these crates. |
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19 - rhg: a pure Rust implementation of Mercurial, with a fallback mechanism for |
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20 unsupported invocations. It reuses the logic ``hg-core`` but |
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21 completely forgoes interaction with Python. See |
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22 ``rust/rhg/README.md`` for more details. |
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23 |
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24 Using Rust code |
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25 =============== |
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26 |
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27 Local use (you need to clean previous build artifacts if you have |
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28 built without rust previously):: |
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29 |
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30 $ make PURE=--rust local # to use ./hg |
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31 $ ./tests/run-tests.py --rust # to run all tests |
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32 $ ./hg debuginstall | grep -i rust # to validate rust is in use |
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33 checking Rust extensions (installed) |
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34 checking module policy (rust+c-allow) |
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35 |
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36 If the environment variable ``HGWITHRUSTEXT=cpython`` is set, the Rust |
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37 extension will be used by default unless ``--no-rust``. |
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38 |
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39 One day we may use this environment variable to switch to new experimental |
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40 binding crates like a hypothetical ``HGWITHRUSTEXT=hpy``. |
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41 |
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42 Special features |
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43 ================ |
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44 |
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45 In the future, compile-time opt-ins may be added |
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46 to the ``features`` section in ``hg-cpython/Cargo.toml``. |
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47 |
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48 To use features from the Makefile, use the ``HG_RUST_FEATURES`` environment |
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49 variable: for instance ``HG_RUST_FEATURES="some-feature other-feature"``. |
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50 |
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51 Profiling |
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52 ========= |
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53 |
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54 Setting the environment variable ``RUST_LOG=trace`` will make hg print |
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55 a few high level rust-related performance numbers. It can also |
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56 indicate why the rust code cannot be used (say, using lookarounds in |
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57 hgignore). |
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58 |
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59 Creating a ``.cargo/config`` file with the following content enables |
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60 debug information in optimized builds. This make profiles more informative |
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61 with source file name and line number for Rust stack frames and |
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62 (in some cases) stack frames for Rust functions that have been inlined:: |
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63 |
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64 [profile.release] |
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65 debug = true |
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66 |
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67 ``py-spy`` (https://github.com/benfred/py-spy) can be used to |
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68 construct a single profile with rust functions and python functions |
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69 (as opposed to ``hg --profile``, which attributes time spent in rust |
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70 to some unlucky python code running shortly after the rust code, and |
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71 as opposed to tools for native code like ``perf``, which attribute |
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72 time to the python interpreter instead of python functions). |
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73 |
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74 Example usage:: |
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75 |
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76 $ make PURE=--rust local # Don't forget to recompile after a code change |
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77 $ py-spy record --native --output /tmp/profile.svg -- ./hg ... |
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78 |
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79 Developing Rust |
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80 =============== |
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81 |
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82 Minimum Supported Rust Version |
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83 ------------------------------ |
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84 |
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85 The minimum supported rust version (MSRV) is specified in the `Clippy`_ |
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86 configuration file at ``rust/clippy.toml``. It is set to be ``1.61.0`` as of |
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87 this writing, but keep in mind that the authoritative value is the one |
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88 from the configuration file. |
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89 |
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90 We bump it from time to time, with the general rule being that our |
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91 MSRV should not be greater that the version of the Rust toolchain |
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92 shipping with Debian testing, so that the Rust enhanced Mercurial can |
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93 be eventually packaged in Debian. |
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94 |
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95 To ensure that you are not depending on features introduced in later |
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96 versions, you can issue ``rustup override set x.y.z`` at the root of |
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97 the repository. |
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98 |
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99 Build and development |
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100 --------------------- |
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101 |
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102 Go to the ``hg-cpython`` folder:: |
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103 |
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104 $ cd rust/hg-cpython |
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105 |
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106 Or, only the ``hg-core`` folder. Be careful not to break compatibility:: |
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107 |
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108 $ cd rust/hg-core |
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109 |
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110 Simply run:: |
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111 |
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112 $ cargo build --release |
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113 |
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114 It is possible to build without ``--release``, but it is not |
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115 recommended if performance is of any interest: there can be an order |
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116 of magnitude of degradation when removing ``--release``. |
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117 |
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118 For faster builds, you may want to skip code generation:: |
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119 |
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120 $ cargo check |
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121 |
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122 For even faster typing:: |
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123 |
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124 $ cargo c |
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125 |
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126 You can run only the rust-specific tests (as opposed to tests of |
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127 mercurial as a whole) with:: |
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128 |
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129 $ cargo test --all |
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130 |
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131 Formatting the code |
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132 ------------------- |
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133 |
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134 We use ``rustfmt`` to keep the code formatted at all times. For now, we are |
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135 using the nightly version because it has been stable enough and provides |
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136 comment folding. |
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137 |
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138 Our CI enforces that the code does not need reformatting. Before |
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139 submitting your changes, please format the entire Rust workspace by running:: |
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140 |
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141 |
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142 $ cargo +nightly fmt |
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143 |
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144 This requires you to have the nightly toolchain installed. |
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145 |
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146 Linting: code sanity |
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147 -------------------- |
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148 |
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149 We're using `Clippy`_, the standard code diagnosis tool of the Rust |
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150 community. |
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151 |
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152 Our CI enforces that the code is free of Clippy warnings, so you might |
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153 want to run it on your side before submitting your changes. Simply do:: |
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154 |
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155 % cargo clippy |
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156 |
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157 from the top of the Rust workspace. Clippy is part of the default |
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158 ``rustup`` install, so it should work right away. In case it would |
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159 not, you can install it with ``rustup component add``. |
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160 |
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161 |
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162 .. _Clippy: https://doc.rust-lang.org/stable/clippy/ |