Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47123:d8ac62374943
dirstate-tree: Make `DirstateMap` borrow from a bytes buffer
… that has the contents of the `.hg/dirstate` file.
This only applies to the tree-based flavor of `DirstateMap`.
For now only the entire `&[u8]` slice is stored, so this is not useful yet.
Adding a lifetime parameter to the `DirstateMap` struct (in hg-core) makes
Python bindings non-trivial because we keep that struct in a Python object
that has a dynamic lifetime tied to Python’s reference-counting and GC.
As long as we keep the `PyBytes` that owns the borrowed bytes buffer next to
the borrowing struct, the buffer will live long enough for the borrows to stay
valid. However this relationship cannot be expressed in safe Rust code in a
way that would statisfy they borrow-checker. We use `unsafe` code to erase
that lifetime parameter, and encapsulate it in a safe abstraction similar to
the owning-ref crate: https://docs.rs/owning_ref/
Differential Revision: https://phab.mercurial-scm.org/D10557
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 30 Apr 2021 18:24:54 +0200 |
parents | b6339a993b91 |
children | cd8ca38fccff |
rev | line source |
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1 use bytes_cast::BytesCast; |
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2 use micro_timer::timed; |
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3 use std::convert::TryInto; |
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4 use std::path::PathBuf; |
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5 |
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6 use super::path_with_basename::WithBasename; |
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7 use crate::dirstate::parsers::clear_ambiguous_mtime; |
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8 use crate::dirstate::parsers::pack_entry; |
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9 use crate::dirstate::parsers::packed_entry_size; |
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10 use crate::dirstate::parsers::parse_dirstate_entries; |
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11 use crate::dirstate::parsers::Timestamp; |
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12 use crate::matchers::Matcher; |
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13 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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14 use crate::CopyMapIter; |
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15 use crate::DirstateEntry; |
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16 use crate::DirstateError; |
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17 use crate::DirstateMapError; |
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18 use crate::DirstateParents; |
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19 use crate::DirstateStatus; |
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20 use crate::EntryState; |
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21 use crate::FastHashMap; |
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22 use crate::PatternFileWarning; |
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23 use crate::StateMapIter; |
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24 use crate::StatusError; |
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25 use crate::StatusOptions; |
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26 |
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27 pub struct DirstateMap<'on_disk> { |
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28 /// Contents of the `.hg/dirstate` file |
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29 on_disk: &'on_disk [u8], |
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30 |
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31 pub(super) root: ChildNodes, |
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32 |
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33 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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34 nodes_with_entry_count: usize, |
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35 |
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36 /// Number of nodes anywhere in the tree that have |
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37 /// `.copy_source.is_some()`. |
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38 nodes_with_copy_source_count: usize, |
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39 } |
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40 |
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41 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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42 /// map key would also work: all paths in a given map have the same parent |
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43 /// path, so comparing full paths gives the same result as comparing base |
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44 /// names. However `BTreeMap` would waste time always re-comparing the same |
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45 /// string prefix. |
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46 pub(super) type ChildNodes = FastHashMap<WithBasename<HgPathBuf>, Node>; |
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47 |
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48 /// Represents a file or a directory |
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49 #[derive(Default)] |
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50 pub(super) struct Node { |
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51 /// `None` for directories |
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52 pub(super) entry: Option<DirstateEntry>, |
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53 |
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54 pub(super) copy_source: Option<HgPathBuf>, |
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55 |
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56 pub(super) children: ChildNodes, |
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57 |
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58 /// How many (non-inclusive) descendants of this node are tracked files |
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59 tracked_descendants_count: usize, |
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60 } |
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61 |
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62 impl Node { |
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63 pub(super) fn state(&self) -> Option<EntryState> { |
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64 self.entry.as_ref().map(|entry| entry.state) |
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65 } |
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66 } |
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67 |
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68 /// `(full_path, entry, copy_source)` |
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69 type NodeDataMut<'a> = ( |
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70 &'a WithBasename<HgPathBuf>, |
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71 &'a mut Option<DirstateEntry>, |
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72 &'a mut Option<HgPathBuf>, |
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73 ); |
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74 |
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75 impl<'on_disk> DirstateMap<'on_disk> { |
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76 pub fn new( |
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77 on_disk: &'on_disk [u8], |
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78 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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79 let mut map = Self { |
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80 on_disk, |
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81 root: ChildNodes::default(), |
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82 nodes_with_entry_count: 0, |
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83 nodes_with_copy_source_count: 0, |
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84 }; |
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85 let parents = map.read()?; |
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86 Ok((map, parents)) |
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87 } |
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88 |
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89 /// Should only be called in `new` |
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90 #[timed] |
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91 fn read(&mut self) -> Result<Option<DirstateParents>, DirstateError> { |
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92 if self.on_disk.is_empty() { |
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93 return Ok(None); |
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94 } |
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95 |
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96 let parents = parse_dirstate_entries( |
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97 self.on_disk, |
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98 |path, entry, copy_source| { |
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99 let tracked = entry.state.is_tracked(); |
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100 let node = Self::get_or_insert_node_tracing_ancestors( |
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101 &mut self.root, |
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102 path, |
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103 |ancestor| { |
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104 if tracked { |
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105 ancestor.tracked_descendants_count += 1 |
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106 } |
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107 }, |
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108 ); |
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109 assert!( |
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110 node.entry.is_none(), |
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111 "duplicate dirstate entry in read" |
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112 ); |
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113 assert!( |
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114 node.copy_source.is_none(), |
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115 "duplicate dirstate entry in read" |
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116 ); |
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117 node.entry = Some(*entry); |
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118 node.copy_source = copy_source.map(HgPath::to_owned); |
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119 self.nodes_with_entry_count += 1; |
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120 if copy_source.is_some() { |
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121 self.nodes_with_copy_source_count += 1 |
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122 } |
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123 }, |
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124 )?; |
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125 |
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126 Ok(Some(parents.clone())) |
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127 } |
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128 |
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129 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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130 let mut children = &self.root; |
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131 let mut components = path.components(); |
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132 let mut component = |
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133 components.next().expect("expected at least one components"); |
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134 loop { |
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135 let child = children.get(component)?; |
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136 if let Some(next_component) = components.next() { |
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137 component = next_component; |
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138 children = &child.children; |
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139 } else { |
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140 return Some(child); |
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141 } |
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142 } |
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143 } |
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144 |
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145 /// Returns a mutable reference to the node at `path` if it exists |
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146 /// |
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147 /// This takes `root` instead of `&mut self` so that callers can mutate |
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148 /// other fields while the returned borrow is still valid |
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149 fn get_node_mut<'tree>( |
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150 root: &'tree mut ChildNodes, |
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151 path: &HgPath, |
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152 ) -> Option<&'tree mut Node> { |
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153 Self::get_node_mut_tracing_ancestors(root, path, |_| {}) |
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154 } |
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155 |
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156 /// Same as `get_node_mut`, and calls `each_ancestor` for each ancestor of |
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157 /// the node. |
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158 /// |
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159 /// Note that `each_ancestor` may be called (with what would be ancestors) |
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160 /// even if it turns out there is no node at `path`. |
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161 fn get_node_mut_tracing_ancestors<'tree>( |
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162 root: &'tree mut ChildNodes, |
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163 path: &HgPath, |
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164 mut each_ancestor: impl FnMut(&mut Node), |
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165 ) -> Option<&'tree mut Node> { |
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166 let mut children = root; |
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167 let mut components = path.components(); |
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168 let mut component = |
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169 components.next().expect("expected at least one components"); |
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170 loop { |
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171 let child = children.get_mut(component)?; |
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172 if let Some(next_component) = components.next() { |
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173 each_ancestor(child); |
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174 component = next_component; |
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175 children = &mut child.children; |
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176 } else { |
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177 return Some(child); |
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178 } |
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179 } |
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180 } |
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181 |
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182 fn get_or_insert_node<'tree>( |
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183 root: &'tree mut ChildNodes, |
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184 path: &HgPath, |
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185 ) -> &'tree mut Node { |
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186 Self::get_or_insert_node_tracing_ancestors(root, path, |_| {}) |
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187 } |
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188 |
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189 fn get_or_insert_node_tracing_ancestors<'tree>( |
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190 root: &'tree mut ChildNodes, |
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191 path: &HgPath, |
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192 mut each_ancestor: impl FnMut(&mut Node), |
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193 ) -> &'tree mut Node { |
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194 let mut child_nodes = root; |
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195 let mut inclusive_ancestor_paths = |
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196 WithBasename::inclusive_ancestors_of(path); |
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197 let mut ancestor_path = inclusive_ancestor_paths |
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198 .next() |
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199 .expect("expected at least one inclusive ancestor"); |
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200 loop { |
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201 // TODO: can we avoid allocating an owned key in cases where the |
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202 // map already contains that key, without introducing double |
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203 // lookup? |
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204 let child_node = |
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205 child_nodes.entry(ancestor_path.to_owned()).or_default(); |
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206 if let Some(next) = inclusive_ancestor_paths.next() { |
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207 each_ancestor(child_node); |
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208 ancestor_path = next; |
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209 child_nodes = &mut child_node.children; |
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210 } else { |
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211 return child_node; |
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212 } |
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213 } |
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214 } |
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215 |
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216 fn add_or_remove_file( |
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217 &mut self, |
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218 path: &HgPath, |
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219 old_state: EntryState, |
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220 new_entry: DirstateEntry, |
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221 ) { |
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222 let tracked_count_increment = |
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223 match (old_state.is_tracked(), new_entry.state.is_tracked()) { |
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224 (false, true) => 1, |
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225 (true, false) => -1, |
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226 _ => 0, |
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227 }; |
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228 |
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229 let node = Self::get_or_insert_node_tracing_ancestors( |
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230 &mut self.root, |
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231 path, |
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232 |ancestor| { |
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233 // We can’t use `+= increment` because the counter is unsigned, |
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234 // and we want debug builds to detect accidental underflow |
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235 // through zero |
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236 match tracked_count_increment { |
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237 1 => ancestor.tracked_descendants_count += 1, |
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238 -1 => ancestor.tracked_descendants_count -= 1, |
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239 _ => {} |
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240 } |
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241 }, |
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242 ); |
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243 if node.entry.is_none() { |
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244 self.nodes_with_entry_count += 1 |
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245 } |
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246 node.entry = Some(new_entry) |
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247 } |
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248 |
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249 fn iter_nodes<'a>( |
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250 &'a self, |
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251 ) -> impl Iterator<Item = (&'a WithBasename<HgPathBuf>, &'a Node)> + 'a |
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252 { |
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253 // Depth first tree traversal. |
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254 // |
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255 // If we could afford internal iteration and recursion, |
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256 // this would look like: |
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257 // |
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258 // ``` |
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259 // fn traverse_children( |
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260 // children: &ChildNodes, |
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261 // each: &mut impl FnMut(&Node), |
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262 // ) { |
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263 // for child in children.values() { |
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264 // traverse_children(&child.children, each); |
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265 // each(child); |
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266 // } |
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267 // } |
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268 // ``` |
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269 // |
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270 // However we want an external iterator and therefore can’t use the |
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271 // call stack. Use an explicit stack instead: |
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272 let mut stack = Vec::new(); |
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273 let mut iter = self.root.iter(); |
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274 std::iter::from_fn(move || { |
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275 while let Some((key, child_node)) = iter.next() { |
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276 // Pseudo-recursion |
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277 let new_iter = child_node.children.iter(); |
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278 let old_iter = std::mem::replace(&mut iter, new_iter); |
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279 stack.push((key, child_node, old_iter)); |
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280 } |
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281 // Found the end of a `children.iter()` iterator. |
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282 if let Some((key, child_node, next_iter)) = stack.pop() { |
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283 // "Return" from pseudo-recursion by restoring state from the |
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284 // explicit stack |
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285 iter = next_iter; |
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286 |
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287 Some((key, child_node)) |
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288 } else { |
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289 // Reached the bottom of the stack, we’re done |
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290 None |
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291 } |
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292 }) |
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293 } |
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294 |
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295 /// Mutable iterator for the `(entry, copy source)` of each node. |
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296 /// |
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297 /// It would not be safe to yield mutable references to nodes themeselves |
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298 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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299 /// reachable from their ancestor nodes, potentially creating multiple |
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300 /// `&mut` references to a given node. |
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301 fn iter_node_data_mut<'a>( |
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302 &'a mut self, |
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303 ) -> impl Iterator<Item = NodeDataMut<'a>> + 'a { |
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304 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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305 let mut stack = Vec::new(); |
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306 let mut iter = self.root.iter_mut(); |
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307 std::iter::from_fn(move || { |
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308 while let Some((key, child_node)) = iter.next() { |
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309 // Pseudo-recursion |
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310 let data = |
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311 (key, &mut child_node.entry, &mut child_node.copy_source); |
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312 let new_iter = child_node.children.iter_mut(); |
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313 let old_iter = std::mem::replace(&mut iter, new_iter); |
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314 stack.push((data, old_iter)); |
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315 } |
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316 // Found the end of a `children.values_mut()` iterator. |
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317 if let Some((data, next_iter)) = stack.pop() { |
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318 // "Return" from pseudo-recursion by restoring state from the |
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319 // explicit stack |
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320 iter = next_iter; |
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321 |
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322 Some(data) |
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323 } else { |
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324 // Reached the bottom of the stack, we’re done |
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325 None |
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326 } |
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327 }) |
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328 } |
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329 } |
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330 |
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331 impl<'on_disk> super::dispatch::DirstateMapMethods for DirstateMap<'on_disk> { |
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332 fn clear(&mut self) { |
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333 self.root.clear(); |
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334 self.nodes_with_entry_count = 0; |
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335 self.nodes_with_copy_source_count = 0; |
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336 } |
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337 |
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338 fn add_file( |
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339 &mut self, |
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340 filename: &HgPath, |
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341 old_state: EntryState, |
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342 entry: DirstateEntry, |
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343 ) -> Result<(), DirstateMapError> { |
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344 self.add_or_remove_file(filename, old_state, entry); |
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345 Ok(()) |
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346 } |
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347 |
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348 fn remove_file( |
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349 &mut self, |
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350 filename: &HgPath, |
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351 old_state: EntryState, |
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352 size: i32, |
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353 ) -> Result<(), DirstateMapError> { |
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354 let entry = DirstateEntry { |
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355 state: EntryState::Removed, |
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356 mode: 0, |
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357 size, |
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358 mtime: 0, |
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359 }; |
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360 self.add_or_remove_file(filename, old_state, entry); |
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361 Ok(()) |
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362 } |
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363 |
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364 fn drop_file( |
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365 &mut self, |
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366 filename: &HgPath, |
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367 old_state: EntryState, |
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368 ) -> Result<bool, DirstateMapError> { |
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369 let was_tracked = old_state.is_tracked(); |
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370 if let Some(node) = Self::get_node_mut_tracing_ancestors( |
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371 &mut self.root, |
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372 filename, |
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373 |ancestor| { |
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374 if was_tracked { |
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375 ancestor.tracked_descendants_count -= 1 |
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376 } |
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377 }, |
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378 ) { |
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379 let had_entry = node.entry.is_some(); |
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380 let had_copy_source = node.copy_source.is_some(); |
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381 |
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382 // TODO: this leaves in the tree a "non-file" node. Should we |
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383 // remove the node instead, together with ancestor nodes for |
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384 // directories that become empty? |
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385 node.entry = None; |
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386 node.copy_source = None; |
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387 |
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388 if had_entry { |
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389 self.nodes_with_entry_count -= 1 |
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390 } |
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391 if had_copy_source { |
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392 self.nodes_with_copy_source_count -= 1 |
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393 } |
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394 Ok(had_entry) |
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395 } else { |
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396 assert!(!was_tracked); |
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397 Ok(false) |
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398 } |
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399 } |
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400 |
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401 fn clear_ambiguous_times(&mut self, filenames: Vec<HgPathBuf>, now: i32) { |
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402 for filename in filenames { |
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403 if let Some(node) = Self::get_node_mut(&mut self.root, &filename) { |
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404 if let Some(entry) = node.entry.as_mut() { |
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405 clear_ambiguous_mtime(entry, now); |
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406 } |
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407 } |
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408 } |
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409 } |
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410 |
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411 fn non_normal_entries_contains(&mut self, key: &HgPath) -> bool { |
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412 self.get_node(key) |
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413 .and_then(|node| node.entry.as_ref()) |
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414 .map_or(false, DirstateEntry::is_non_normal) |
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415 } |
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416 |
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417 fn non_normal_entries_remove(&mut self, _key: &HgPath) { |
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418 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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419 // entries" set that need to be kept up to date |
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420 } |
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421 |
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422 fn non_normal_or_other_parent_paths( |
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423 &mut self, |
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424 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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425 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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426 node.entry |
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427 .as_ref() |
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428 .filter(|entry| { |
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429 entry.is_non_normal() || entry.is_from_other_parent() |
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430 }) |
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431 .map(|_| path.full_path()) |
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432 })) |
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433 } |
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434 |
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435 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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436 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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437 // entries" and "from other parent" sets that need to be recomputed |
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438 } |
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439 |
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440 fn iter_non_normal_paths( |
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441 &mut self, |
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442 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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443 self.iter_non_normal_paths_panic() |
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444 } |
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445 |
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446 fn iter_non_normal_paths_panic( |
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447 &self, |
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448 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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449 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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450 node.entry |
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451 .as_ref() |
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452 .filter(|entry| entry.is_non_normal()) |
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453 .map(|_| path.full_path()) |
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454 })) |
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455 } |
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456 |
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457 fn iter_other_parent_paths( |
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458 &mut self, |
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459 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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460 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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461 node.entry |
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462 .as_ref() |
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463 .filter(|entry| entry.is_from_other_parent()) |
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464 .map(|_| path.full_path()) |
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465 })) |
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466 } |
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467 |
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468 fn has_tracked_dir( |
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469 &mut self, |
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470 directory: &HgPath, |
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471 ) -> Result<bool, DirstateMapError> { |
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472 if let Some(node) = self.get_node(directory) { |
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473 // A node without a `DirstateEntry` was created to hold child |
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474 // nodes, and is therefore a directory. |
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475 Ok(node.entry.is_none() && node.tracked_descendants_count > 0) |
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476 } else { |
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477 Ok(false) |
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478 } |
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479 } |
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480 |
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481 fn has_dir( |
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482 &mut self, |
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483 directory: &HgPath, |
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484 ) -> Result<bool, DirstateMapError> { |
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485 if let Some(node) = self.get_node(directory) { |
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486 // A node without a `DirstateEntry` was created to hold child |
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487 // nodes, and is therefore a directory. |
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488 Ok(node.entry.is_none()) |
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489 } else { |
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490 Ok(false) |
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491 } |
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492 } |
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493 |
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494 fn pack( |
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495 &mut self, |
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496 parents: DirstateParents, |
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497 now: Timestamp, |
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498 ) -> Result<Vec<u8>, DirstateError> { |
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499 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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500 // reallocations |
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501 let mut size = parents.as_bytes().len(); |
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502 for (path, node) in self.iter_nodes() { |
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503 if node.entry.is_some() { |
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504 size += packed_entry_size( |
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505 path.full_path(), |
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506 node.copy_source.as_ref(), |
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507 ) |
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508 } |
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509 } |
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510 |
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511 let mut packed = Vec::with_capacity(size); |
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512 packed.extend(parents.as_bytes()); |
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513 |
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514 let now: i32 = now.0.try_into().expect("time overflow"); |
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515 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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516 if let Some(entry) = opt_entry { |
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517 clear_ambiguous_mtime(entry, now); |
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518 pack_entry( |
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519 path.full_path(), |
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520 entry, |
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521 copy_source.as_ref(), |
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522 &mut packed, |
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523 ); |
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524 } |
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525 } |
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526 Ok(packed) |
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527 } |
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528 |
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529 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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530 // Do nothing, this `DirstateMap` does not a separate `all_dirs` that |
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531 // needs to be recomputed |
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532 Ok(()) |
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533 } |
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534 |
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535 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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536 // Do nothing, this `DirstateMap` does not a separate `dirs` that needs |
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537 // to be recomputed |
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538 Ok(()) |
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539 } |
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540 |
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541 fn status<'a>( |
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542 &'a mut self, |
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543 matcher: &'a (dyn Matcher + Sync), |
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544 root_dir: PathBuf, |
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545 ignore_files: Vec<PathBuf>, |
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546 options: StatusOptions, |
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547 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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548 { |
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549 super::status::status(self, matcher, root_dir, ignore_files, options) |
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550 } |
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551 |
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552 fn copy_map_len(&self) -> usize { |
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553 self.nodes_with_copy_source_count |
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554 } |
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555 |
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556 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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557 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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558 node.copy_source |
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559 .as_ref() |
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560 .map(|copy_source| (path.full_path(), copy_source)) |
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561 })) |
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562 } |
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563 |
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564 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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565 if let Some(node) = self.get_node(key) { |
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566 node.copy_source.is_some() |
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567 } else { |
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568 false |
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569 } |
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570 } |
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571 |
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572 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
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573 self.get_node(key)?.copy_source.as_ref() |
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574 } |
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575 |
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576 fn copy_map_remove(&mut self, key: &HgPath) -> Option<HgPathBuf> { |
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577 let count = &mut self.nodes_with_copy_source_count; |
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578 Self::get_node_mut(&mut self.root, key).and_then(|node| { |
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579 if node.copy_source.is_some() { |
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580 *count -= 1 |
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581 } |
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582 node.copy_source.take() |
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583 }) |
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584 } |
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585 |
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586 fn copy_map_insert( |
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587 &mut self, |
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588 key: HgPathBuf, |
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589 value: HgPathBuf, |
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590 ) -> Option<HgPathBuf> { |
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591 let node = Self::get_or_insert_node(&mut self.root, &key); |
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592 if node.copy_source.is_none() { |
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593 self.nodes_with_copy_source_count += 1 |
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594 } |
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595 node.copy_source.replace(value) |
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596 } |
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597 |
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598 fn len(&self) -> usize { |
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599 self.nodes_with_entry_count |
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600 } |
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601 |
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602 fn contains_key(&self, key: &HgPath) -> bool { |
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603 self.get(key).is_some() |
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604 } |
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605 |
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606 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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607 self.get_node(key)?.entry.as_ref() |
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608 } |
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609 |
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610 fn iter(&self) -> StateMapIter<'_> { |
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611 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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612 node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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613 })) |
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614 } |
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615 } |