Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47283:2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Nodes are stored not only for tracked files but also for their ancestor
directories. A node has "pointers" (byte count from the start of the file)
to its direct child nodes. Everything can be accessed with zero copy.
Differential Revision: https://phab.mercurial-scm.org/D10722
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 19 May 2021 13:15:00 +0200 |
parents | ce41ee53263f |
children | 73f23e7610f8 |
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::borrow::Cow; |
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4 use std::convert::TryInto; |
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5 use std::path::PathBuf; |
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6 |
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7 use super::on_disk; |
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8 use super::path_with_basename::WithBasename; |
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9 use crate::dirstate::parsers::clear_ambiguous_mtime; |
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10 use crate::dirstate::parsers::pack_entry; |
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11 use crate::dirstate::parsers::packed_entry_size; |
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12 use crate::dirstate::parsers::parse_dirstate_entries; |
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13 use crate::dirstate::parsers::Timestamp; |
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14 use crate::matchers::Matcher; |
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15 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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16 use crate::CopyMapIter; |
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17 use crate::DirstateEntry; |
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18 use crate::DirstateError; |
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19 use crate::DirstateMapError; |
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20 use crate::DirstateParents; |
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21 use crate::DirstateStatus; |
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22 use crate::EntryState; |
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23 use crate::FastHashMap; |
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24 use crate::PatternFileWarning; |
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25 use crate::StateMapIter; |
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26 use crate::StatusError; |
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27 use crate::StatusOptions; |
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28 |
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29 pub struct DirstateMap<'on_disk> { |
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30 /// Contents of the `.hg/dirstate` file |
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31 pub(super) on_disk: &'on_disk [u8], |
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32 |
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33 pub(super) root: ChildNodes<'on_disk>, |
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34 |
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35 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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36 pub(super) nodes_with_entry_count: u32, |
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37 |
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38 /// Number of nodes anywhere in the tree that have |
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39 /// `.copy_source.is_some()`. |
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40 pub(super) nodes_with_copy_source_count: u32, |
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41 } |
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42 |
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43 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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44 /// map key would also work: all paths in a given map have the same parent |
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45 /// path, so comparing full paths gives the same result as comparing base |
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46 /// names. However `HashMap` would waste time always re-hashing the same |
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47 /// string prefix. |
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48 pub(super) type NodeKey<'on_disk> = WithBasename<Cow<'on_disk, HgPath>>; |
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49 pub(super) type ChildNodes<'on_disk> = |
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50 FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>; |
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51 |
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52 /// Represents a file or a directory |
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53 #[derive(Default)] |
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54 pub(super) struct Node<'on_disk> { |
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55 /// `None` for directories |
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56 pub(super) entry: Option<DirstateEntry>, |
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57 |
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58 pub(super) copy_source: Option<Cow<'on_disk, HgPath>>, |
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59 |
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60 pub(super) children: ChildNodes<'on_disk>, |
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61 |
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62 /// How many (non-inclusive) descendants of this node are tracked files |
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63 pub(super) tracked_descendants_count: u32, |
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64 } |
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65 |
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66 impl<'on_disk> Node<'on_disk> { |
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67 pub(super) fn state(&self) -> Option<EntryState> { |
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68 self.entry.as_ref().map(|entry| entry.state) |
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69 } |
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70 |
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71 pub(super) fn sorted<'tree>( |
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72 nodes: &'tree mut ChildNodes<'on_disk>, |
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73 ) -> Vec<(&'tree NodeKey<'on_disk>, &'tree mut Self)> { |
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74 let mut vec: Vec<_> = nodes.iter_mut().collect(); |
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75 // `sort_unstable_by_key` doesn’t allow keys borrowing from the value: |
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76 // https://github.com/rust-lang/rust/issues/34162 |
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77 vec.sort_unstable_by(|(path1, _), (path2, _)| path1.cmp(path2)); |
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78 vec |
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79 } |
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80 } |
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81 |
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82 /// `(full_path, entry, copy_source)` |
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83 type NodeDataMut<'tree, 'on_disk> = ( |
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84 &'tree HgPath, |
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85 &'tree mut Option<DirstateEntry>, |
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86 &'tree mut Option<Cow<'on_disk, HgPath>>, |
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87 ); |
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88 |
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89 impl<'on_disk> DirstateMap<'on_disk> { |
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90 pub(super) fn empty(on_disk: &'on_disk [u8]) -> Self { |
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91 Self { |
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92 on_disk, |
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93 root: ChildNodes::default(), |
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94 nodes_with_entry_count: 0, |
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95 nodes_with_copy_source_count: 0, |
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96 } |
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97 } |
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98 |
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99 #[timed] |
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100 pub fn new_v2( |
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101 on_disk: &'on_disk [u8], |
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102 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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103 on_disk::read(on_disk) |
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104 } |
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105 |
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106 #[timed] |
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107 pub fn new_v1( |
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108 on_disk: &'on_disk [u8], |
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109 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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110 let mut map = Self::empty(on_disk); |
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111 if map.on_disk.is_empty() { |
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112 return Ok((map, None)); |
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113 } |
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114 |
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115 let parents = parse_dirstate_entries( |
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116 map.on_disk, |
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117 |path, entry, copy_source| { |
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118 let tracked = entry.state.is_tracked(); |
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119 let node = Self::get_or_insert_node( |
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120 &mut map.root, |
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121 path, |
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122 WithBasename::to_cow_borrowed, |
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123 |ancestor| { |
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124 if tracked { |
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125 ancestor.tracked_descendants_count += 1 |
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126 } |
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127 }, |
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128 ); |
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129 assert!( |
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130 node.entry.is_none(), |
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131 "duplicate dirstate entry in read" |
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132 ); |
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133 assert!( |
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134 node.copy_source.is_none(), |
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135 "duplicate dirstate entry in read" |
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136 ); |
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137 node.entry = Some(*entry); |
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138 node.copy_source = copy_source.map(Cow::Borrowed); |
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139 map.nodes_with_entry_count += 1; |
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140 if copy_source.is_some() { |
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141 map.nodes_with_copy_source_count += 1 |
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142 } |
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143 }, |
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144 )?; |
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145 let parents = Some(parents.clone()); |
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146 |
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147 Ok((map, parents)) |
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148 } |
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149 |
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150 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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151 let mut children = &self.root; |
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152 let mut components = path.components(); |
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153 let mut component = |
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154 components.next().expect("expected at least one components"); |
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155 loop { |
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156 let child = children.get(component)?; |
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157 if let Some(next_component) = components.next() { |
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158 component = next_component; |
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159 children = &child.children; |
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160 } else { |
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161 return Some(child); |
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162 } |
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163 } |
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164 } |
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165 |
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166 /// Returns a mutable reference to the node at `path` if it exists |
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167 /// |
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168 /// This takes `root` instead of `&mut self` so that callers can mutate |
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169 /// other fields while the returned borrow is still valid |
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170 fn get_node_mut<'tree>( |
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171 root: &'tree mut ChildNodes<'on_disk>, |
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172 path: &HgPath, |
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173 ) -> Option<&'tree mut Node<'on_disk>> { |
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174 let mut children = root; |
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175 let mut components = path.components(); |
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176 let mut component = |
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177 components.next().expect("expected at least one components"); |
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178 loop { |
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179 let child = children.get_mut(component)?; |
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180 if let Some(next_component) = components.next() { |
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181 component = next_component; |
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182 children = &mut child.children; |
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183 } else { |
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184 return Some(child); |
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185 } |
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186 } |
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187 } |
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188 |
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189 fn get_or_insert_node<'tree, 'path>( |
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190 root: &'tree mut ChildNodes<'on_disk>, |
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191 path: &'path HgPath, |
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192 to_cow: impl Fn( |
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193 WithBasename<&'path HgPath>, |
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194 ) -> WithBasename<Cow<'on_disk, HgPath>>, |
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195 mut each_ancestor: impl FnMut(&mut Node), |
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196 ) -> &'tree mut Node<'on_disk> { |
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197 let mut child_nodes = root; |
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198 let mut inclusive_ancestor_paths = |
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199 WithBasename::inclusive_ancestors_of(path); |
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200 let mut ancestor_path = inclusive_ancestor_paths |
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201 .next() |
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202 .expect("expected at least one inclusive ancestor"); |
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203 loop { |
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204 // TODO: can we avoid allocating an owned key in cases where the |
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205 // map already contains that key, without introducing double |
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206 // lookup? |
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207 let child_node = |
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208 child_nodes.entry(to_cow(ancestor_path)).or_default(); |
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209 if let Some(next) = inclusive_ancestor_paths.next() { |
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210 each_ancestor(child_node); |
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211 ancestor_path = next; |
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212 child_nodes = &mut child_node.children; |
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213 } else { |
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214 return child_node; |
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215 } |
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216 } |
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217 } |
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218 |
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219 fn add_or_remove_file( |
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220 &mut self, |
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221 path: &HgPath, |
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222 old_state: EntryState, |
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223 new_entry: DirstateEntry, |
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224 ) { |
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225 let tracked_count_increment = |
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226 match (old_state.is_tracked(), new_entry.state.is_tracked()) { |
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227 (false, true) => 1, |
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228 (true, false) => -1, |
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229 _ => 0, |
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230 }; |
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231 |
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232 let node = Self::get_or_insert_node( |
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233 &mut self.root, |
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234 path, |
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235 WithBasename::to_cow_owned, |
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236 |ancestor| { |
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237 // We can’t use `+= increment` because the counter is unsigned, |
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238 // and we want debug builds to detect accidental underflow |
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239 // through zero |
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240 match tracked_count_increment { |
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241 1 => ancestor.tracked_descendants_count += 1, |
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242 -1 => ancestor.tracked_descendants_count -= 1, |
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243 _ => {} |
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244 } |
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245 }, |
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246 ); |
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247 if node.entry.is_none() { |
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248 self.nodes_with_entry_count += 1 |
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249 } |
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250 node.entry = Some(new_entry) |
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251 } |
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252 |
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253 fn iter_nodes<'a>( |
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254 &'a self, |
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255 ) -> impl Iterator<Item = (&'a HgPath, &'a Node)> + 'a { |
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256 // Depth first tree traversal. |
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257 // |
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258 // If we could afford internal iteration and recursion, |
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259 // this would look like: |
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260 // |
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261 // ``` |
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262 // fn traverse_children( |
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263 // children: &ChildNodes, |
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264 // each: &mut impl FnMut(&Node), |
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265 // ) { |
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266 // for child in children.values() { |
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267 // traverse_children(&child.children, each); |
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268 // each(child); |
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269 // } |
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270 // } |
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271 // ``` |
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272 // |
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273 // However we want an external iterator and therefore can’t use the |
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274 // call stack. Use an explicit stack instead: |
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275 let mut stack = Vec::new(); |
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276 let mut iter = self.root.iter(); |
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277 std::iter::from_fn(move || { |
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278 while let Some((key, child_node)) = iter.next() { |
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279 // Pseudo-recursion |
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280 let new_iter = child_node.children.iter(); |
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281 let old_iter = std::mem::replace(&mut iter, new_iter); |
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282 let key = &**key.full_path(); |
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283 stack.push((key, child_node, old_iter)); |
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284 } |
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285 // Found the end of a `children.iter()` iterator. |
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286 if let Some((key, child_node, next_iter)) = stack.pop() { |
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287 // "Return" from pseudo-recursion by restoring state from the |
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288 // explicit stack |
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289 iter = next_iter; |
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290 |
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291 Some((key, child_node)) |
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292 } else { |
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293 // Reached the bottom of the stack, we’re done |
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294 None |
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295 } |
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296 }) |
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297 } |
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298 |
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299 /// Mutable iterator for the `(entry, copy source)` of each node. |
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300 /// |
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301 /// It would not be safe to yield mutable references to nodes themeselves |
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302 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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303 /// reachable from their ancestor nodes, potentially creating multiple |
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304 /// `&mut` references to a given node. |
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305 fn iter_node_data_mut<'tree>( |
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306 &'tree mut self, |
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307 ) -> impl Iterator<Item = NodeDataMut<'tree, 'on_disk>> + 'tree { |
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308 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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309 let mut stack = Vec::new(); |
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310 let mut iter = self.root.iter_mut(); |
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311 std::iter::from_fn(move || { |
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312 while let Some((key, child_node)) = iter.next() { |
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313 // Pseudo-recursion |
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314 let data = ( |
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315 &**key.full_path(), |
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316 &mut child_node.entry, |
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317 &mut child_node.copy_source, |
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318 ); |
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319 let new_iter = child_node.children.iter_mut(); |
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320 let old_iter = std::mem::replace(&mut iter, new_iter); |
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321 stack.push((data, old_iter)); |
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322 } |
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323 // Found the end of a `children.values_mut()` iterator. |
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324 if let Some((data, next_iter)) = stack.pop() { |
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325 // "Return" from pseudo-recursion by restoring state from the |
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326 // explicit stack |
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327 iter = next_iter; |
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328 |
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329 Some(data) |
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330 } else { |
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331 // Reached the bottom of the stack, we’re done |
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332 None |
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333 } |
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334 }) |
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335 } |
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336 } |
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337 |
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338 impl<'on_disk> super::dispatch::DirstateMapMethods for DirstateMap<'on_disk> { |
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339 fn clear(&mut self) { |
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340 self.root.clear(); |
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341 self.nodes_with_entry_count = 0; |
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342 self.nodes_with_copy_source_count = 0; |
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343 } |
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344 |
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345 fn add_file( |
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346 &mut self, |
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347 filename: &HgPath, |
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348 old_state: EntryState, |
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349 entry: DirstateEntry, |
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350 ) -> Result<(), DirstateMapError> { |
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351 self.add_or_remove_file(filename, old_state, entry); |
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352 Ok(()) |
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353 } |
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354 |
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355 fn remove_file( |
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356 &mut self, |
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357 filename: &HgPath, |
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358 old_state: EntryState, |
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359 size: i32, |
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360 ) -> Result<(), DirstateMapError> { |
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361 let entry = DirstateEntry { |
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362 state: EntryState::Removed, |
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363 mode: 0, |
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364 size, |
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365 mtime: 0, |
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366 }; |
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367 self.add_or_remove_file(filename, old_state, entry); |
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368 Ok(()) |
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369 } |
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370 |
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371 fn drop_file( |
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372 &mut self, |
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373 filename: &HgPath, |
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374 old_state: EntryState, |
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375 ) -> Result<bool, DirstateMapError> { |
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376 struct Dropped { |
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377 was_tracked: bool, |
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378 had_entry: bool, |
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379 had_copy_source: bool, |
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380 } |
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381 fn recur(nodes: &mut ChildNodes, path: &HgPath) -> Option<Dropped> { |
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382 let (first_path_component, rest_of_path) = |
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383 path.split_first_component(); |
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384 let node = nodes.get_mut(first_path_component)?; |
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385 let dropped; |
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386 if let Some(rest) = rest_of_path { |
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387 dropped = recur(&mut node.children, rest)?; |
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388 if dropped.was_tracked { |
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389 node.tracked_descendants_count -= 1; |
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390 } |
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391 } else { |
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392 dropped = Dropped { |
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393 was_tracked: node |
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394 .entry |
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395 .as_ref() |
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396 .map_or(false, |entry| entry.state.is_tracked()), |
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397 had_entry: node.entry.take().is_some(), |
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398 had_copy_source: node.copy_source.take().is_some(), |
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399 }; |
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400 } |
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401 // After recursion, for both leaf (rest_of_path is None) nodes and |
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402 // parent nodes, remove a node if it just became empty. |
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403 if node.entry.is_none() |
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404 && node.copy_source.is_none() |
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405 && node.children.is_empty() |
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406 { |
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407 nodes.remove(first_path_component); |
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408 } |
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409 Some(dropped) |
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410 } |
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411 |
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412 if let Some(dropped) = recur(&mut self.root, filename) { |
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413 if dropped.had_entry { |
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414 self.nodes_with_entry_count -= 1 |
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415 } |
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416 if dropped.had_copy_source { |
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417 self.nodes_with_copy_source_count -= 1 |
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418 } |
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419 Ok(dropped.had_entry) |
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420 } else { |
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421 debug_assert!(!old_state.is_tracked()); |
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422 Ok(false) |
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423 } |
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424 } |
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425 |
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426 fn clear_ambiguous_times(&mut self, filenames: Vec<HgPathBuf>, now: i32) { |
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427 for filename in filenames { |
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428 if let Some(node) = Self::get_node_mut(&mut self.root, &filename) { |
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429 if let Some(entry) = node.entry.as_mut() { |
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430 clear_ambiguous_mtime(entry, now); |
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431 } |
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432 } |
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433 } |
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434 } |
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435 |
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436 fn non_normal_entries_contains(&mut self, key: &HgPath) -> bool { |
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437 self.get_node(key) |
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438 .and_then(|node| node.entry.as_ref()) |
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439 .map_or(false, DirstateEntry::is_non_normal) |
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440 } |
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441 |
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442 fn non_normal_entries_remove(&mut self, _key: &HgPath) { |
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443 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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444 // entries" set that need to be kept up to date |
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445 } |
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446 |
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447 fn non_normal_or_other_parent_paths( |
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448 &mut self, |
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449 ) -> Box<dyn Iterator<Item = &HgPath> + '_> { |
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450 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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451 node.entry |
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452 .as_ref() |
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453 .filter(|entry| { |
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454 entry.is_non_normal() || entry.is_from_other_parent() |
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455 }) |
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456 .map(|_| path) |
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457 })) |
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458 } |
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459 |
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460 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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461 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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462 // entries" and "from other parent" sets that need to be recomputed |
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463 } |
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464 |
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465 fn iter_non_normal_paths( |
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466 &mut self, |
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467 ) -> Box<dyn Iterator<Item = &HgPath> + Send + '_> { |
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468 self.iter_non_normal_paths_panic() |
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469 } |
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470 |
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471 fn iter_non_normal_paths_panic( |
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472 &self, |
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473 ) -> Box<dyn Iterator<Item = &HgPath> + Send + '_> { |
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474 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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475 node.entry |
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476 .as_ref() |
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477 .filter(|entry| entry.is_non_normal()) |
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478 .map(|_| path) |
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479 })) |
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480 } |
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481 |
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482 fn iter_other_parent_paths( |
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483 &mut self, |
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484 ) -> Box<dyn Iterator<Item = &HgPath> + Send + '_> { |
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485 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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486 node.entry |
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487 .as_ref() |
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488 .filter(|entry| entry.is_from_other_parent()) |
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489 .map(|_| path) |
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490 })) |
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491 } |
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492 |
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493 fn has_tracked_dir( |
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494 &mut self, |
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495 directory: &HgPath, |
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496 ) -> Result<bool, DirstateMapError> { |
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497 if let Some(node) = self.get_node(directory) { |
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498 // A node without a `DirstateEntry` was created to hold child |
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499 // nodes, and is therefore a directory. |
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500 Ok(node.entry.is_none() && node.tracked_descendants_count > 0) |
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501 } else { |
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502 Ok(false) |
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503 } |
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504 } |
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505 |
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506 fn has_dir( |
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507 &mut self, |
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508 directory: &HgPath, |
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509 ) -> Result<bool, DirstateMapError> { |
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510 if let Some(node) = self.get_node(directory) { |
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511 // A node without a `DirstateEntry` was created to hold child |
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512 // nodes, and is therefore a directory. |
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513 Ok(node.entry.is_none()) |
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514 } else { |
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515 Ok(false) |
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516 } |
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517 } |
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518 |
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519 #[timed] |
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520 fn pack_v1( |
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521 &mut self, |
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522 parents: DirstateParents, |
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523 now: Timestamp, |
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524 ) -> Result<Vec<u8>, DirstateError> { |
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525 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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526 // reallocations |
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527 let mut size = parents.as_bytes().len(); |
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528 for (path, node) in self.iter_nodes() { |
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529 if node.entry.is_some() { |
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530 size += packed_entry_size( |
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531 path, |
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532 node.copy_source.as_ref().map(|p| &**p), |
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533 ) |
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534 } |
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535 } |
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536 |
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537 let mut packed = Vec::with_capacity(size); |
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538 packed.extend(parents.as_bytes()); |
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539 |
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540 let now: i32 = now.0.try_into().expect("time overflow"); |
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541 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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542 if let Some(entry) = opt_entry { |
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543 clear_ambiguous_mtime(entry, now); |
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544 pack_entry( |
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545 path, |
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546 entry, |
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547 copy_source.as_ref().map(|p| &**p), |
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548 &mut packed, |
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549 ); |
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550 } |
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551 } |
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552 Ok(packed) |
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553 } |
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554 |
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555 #[timed] |
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556 fn pack_v2( |
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557 &mut self, |
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558 parents: DirstateParents, |
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559 now: Timestamp, |
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560 ) -> Result<Vec<u8>, DirstateError> { |
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561 on_disk::write(self, parents, now) |
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562 } |
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563 |
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564 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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565 // Do nothing, this `DirstateMap` does not a separate `all_dirs` that |
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566 // needs to be recomputed |
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567 Ok(()) |
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568 } |
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569 |
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570 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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571 // Do nothing, this `DirstateMap` does not a separate `dirs` that needs |
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572 // to be recomputed |
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573 Ok(()) |
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574 } |
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575 |
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576 fn status<'a>( |
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577 &'a mut self, |
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578 matcher: &'a (dyn Matcher + Sync), |
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579 root_dir: PathBuf, |
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580 ignore_files: Vec<PathBuf>, |
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581 options: StatusOptions, |
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582 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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583 { |
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584 super::status::status(self, matcher, root_dir, ignore_files, options) |
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585 } |
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586 |
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587 fn copy_map_len(&self) -> usize { |
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588 self.nodes_with_copy_source_count as usize |
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589 } |
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590 |
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591 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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592 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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593 node.copy_source |
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594 .as_ref() |
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595 .map(|copy_source| (path, &**copy_source)) |
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596 })) |
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597 } |
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598 |
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599 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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600 if let Some(node) = self.get_node(key) { |
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601 node.copy_source.is_some() |
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602 } else { |
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603 false |
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604 } |
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605 } |
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606 |
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607 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPath> { |
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608 self.get_node(key)?.copy_source.as_ref().map(|p| &**p) |
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609 } |
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610 |
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611 fn copy_map_remove(&mut self, key: &HgPath) -> Option<HgPathBuf> { |
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612 let count = &mut self.nodes_with_copy_source_count; |
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613 Self::get_node_mut(&mut self.root, key).and_then(|node| { |
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614 if node.copy_source.is_some() { |
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615 *count -= 1 |
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616 } |
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617 node.copy_source.take().map(Cow::into_owned) |
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618 }) |
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619 } |
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620 |
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621 fn copy_map_insert( |
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622 &mut self, |
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623 key: HgPathBuf, |
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624 value: HgPathBuf, |
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625 ) -> Option<HgPathBuf> { |
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626 let node = Self::get_or_insert_node( |
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627 &mut self.root, |
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628 &key, |
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629 WithBasename::to_cow_owned, |
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630 |_ancestor| {}, |
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631 ); |
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632 if node.copy_source.is_none() { |
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633 self.nodes_with_copy_source_count += 1 |
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634 } |
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635 node.copy_source.replace(value.into()).map(Cow::into_owned) |
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636 } |
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637 |
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638 fn len(&self) -> usize { |
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639 self.nodes_with_entry_count as usize |
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640 } |
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641 |
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642 fn contains_key(&self, key: &HgPath) -> bool { |
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643 self.get(key).is_some() |
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644 } |
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645 |
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646 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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647 self.get_node(key)?.entry.as_ref() |
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648 } |
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649 |
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650 fn iter(&self) -> StateMapIter<'_> { |
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651 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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652 node.entry.as_ref().map(|entry| (path, entry)) |
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653 })) |
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654 } |
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655 } |