Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47477:eb416759af7e
dirstate: Removed unused instances of `DirsMultiset`
… in Rust-backed dirstatemap.
The Python class `dirstatemap` had cached properties `_dirs` and `_alldirs`
that were not used for `hastrackeddir` and `hasdir` since they were redundant
with corresponding fields for the Rust `DirstateMap` struct.
`dirfoldmap` is modified to reuse instead the directory iterator introduced
in 3b9914b28133c0918186b6e8b9e4f1916e21338d.
Differential Revision: https://phab.mercurial-scm.org/D10921
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 28 Jun 2021 15:52:10 +0200 |
parents | c657beacdf2e |
children | ca8121d26732 |
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::on_disk::DirstateV2ParseError; |
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9 use super::path_with_basename::WithBasename; |
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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::DirstateParents; |
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20 use crate::DirstateStatus; |
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21 use crate::EntryState; |
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22 use crate::FastHashMap; |
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23 use crate::PatternFileWarning; |
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24 use crate::StateMapIter; |
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25 use crate::StatusError; |
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26 use crate::StatusOptions; |
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27 |
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28 pub struct DirstateMap<'on_disk> { |
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29 /// Contents of the `.hg/dirstate` file |
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30 pub(super) on_disk: &'on_disk [u8], |
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31 |
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32 pub(super) root: ChildNodes<'on_disk>, |
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33 |
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34 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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35 pub(super) nodes_with_entry_count: u32, |
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36 |
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37 /// Number of nodes anywhere in the tree that have |
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38 /// `.copy_source.is_some()`. |
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39 pub(super) nodes_with_copy_source_count: u32, |
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40 |
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41 /// See on_disk::Header |
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42 pub(super) ignore_patterns_hash: on_disk::IgnorePatternsHash, |
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43 } |
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44 |
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45 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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46 /// map key would also work: all paths in a given map have the same parent |
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47 /// path, so comparing full paths gives the same result as comparing base |
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48 /// names. However `HashMap` would waste time always re-hashing the same |
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49 /// string prefix. |
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50 pub(super) type NodeKey<'on_disk> = WithBasename<Cow<'on_disk, HgPath>>; |
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51 |
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52 /// Similar to `&'tree Cow<'on_disk, HgPath>`, but can also be returned |
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53 /// for on-disk nodes that don’t actually have a `Cow` to borrow. |
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54 pub(super) enum BorrowedPath<'tree, 'on_disk> { |
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55 InMemory(&'tree HgPathBuf), |
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56 OnDisk(&'on_disk HgPath), |
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57 } |
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58 |
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59 pub(super) enum ChildNodes<'on_disk> { |
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60 InMemory(FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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61 OnDisk(&'on_disk [on_disk::Node]), |
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62 } |
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63 |
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64 pub(super) enum ChildNodesRef<'tree, 'on_disk> { |
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65 InMemory(&'tree FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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66 OnDisk(&'on_disk [on_disk::Node]), |
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67 } |
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68 |
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69 pub(super) enum NodeRef<'tree, 'on_disk> { |
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70 InMemory(&'tree NodeKey<'on_disk>, &'tree Node<'on_disk>), |
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71 OnDisk(&'on_disk on_disk::Node), |
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72 } |
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73 |
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74 impl<'tree, 'on_disk> BorrowedPath<'tree, 'on_disk> { |
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75 pub fn detach_from_tree(&self) -> Cow<'on_disk, HgPath> { |
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76 match *self { |
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77 BorrowedPath::InMemory(in_memory) => Cow::Owned(in_memory.clone()), |
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78 BorrowedPath::OnDisk(on_disk) => Cow::Borrowed(on_disk), |
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79 } |
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80 } |
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81 } |
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82 |
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83 impl<'tree, 'on_disk> std::ops::Deref for BorrowedPath<'tree, 'on_disk> { |
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84 type Target = HgPath; |
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85 |
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86 fn deref(&self) -> &HgPath { |
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87 match *self { |
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88 BorrowedPath::InMemory(in_memory) => in_memory, |
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89 BorrowedPath::OnDisk(on_disk) => on_disk, |
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90 } |
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91 } |
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92 } |
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93 |
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94 impl Default for ChildNodes<'_> { |
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95 fn default() -> Self { |
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96 ChildNodes::InMemory(Default::default()) |
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97 } |
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98 } |
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99 |
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100 impl<'on_disk> ChildNodes<'on_disk> { |
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101 pub(super) fn as_ref<'tree>( |
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102 &'tree self, |
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103 ) -> ChildNodesRef<'tree, 'on_disk> { |
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104 match self { |
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105 ChildNodes::InMemory(nodes) => ChildNodesRef::InMemory(nodes), |
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106 ChildNodes::OnDisk(nodes) => ChildNodesRef::OnDisk(nodes), |
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107 } |
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108 } |
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109 |
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110 pub(super) fn is_empty(&self) -> bool { |
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111 match self { |
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112 ChildNodes::InMemory(nodes) => nodes.is_empty(), |
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113 ChildNodes::OnDisk(nodes) => nodes.is_empty(), |
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114 } |
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115 } |
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116 |
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117 pub(super) fn make_mut( |
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118 &mut self, |
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119 on_disk: &'on_disk [u8], |
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120 ) -> Result< |
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121 &mut FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>, |
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122 DirstateV2ParseError, |
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123 > { |
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124 match self { |
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125 ChildNodes::InMemory(nodes) => Ok(nodes), |
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126 ChildNodes::OnDisk(nodes) => { |
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127 let nodes = nodes |
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128 .iter() |
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129 .map(|node| { |
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130 Ok(( |
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131 node.path(on_disk)?, |
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132 node.to_in_memory_node(on_disk)?, |
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133 )) |
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134 }) |
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135 .collect::<Result<_, _>>()?; |
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136 *self = ChildNodes::InMemory(nodes); |
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137 match self { |
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138 ChildNodes::InMemory(nodes) => Ok(nodes), |
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139 ChildNodes::OnDisk(_) => unreachable!(), |
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140 } |
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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 |
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146 impl<'tree, 'on_disk> ChildNodesRef<'tree, 'on_disk> { |
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147 pub(super) fn get( |
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148 &self, |
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149 base_name: &HgPath, |
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150 on_disk: &'on_disk [u8], |
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151 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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152 match self { |
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153 ChildNodesRef::InMemory(nodes) => Ok(nodes |
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154 .get_key_value(base_name) |
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155 .map(|(k, v)| NodeRef::InMemory(k, v))), |
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156 ChildNodesRef::OnDisk(nodes) => { |
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157 let mut parse_result = Ok(()); |
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158 let search_result = nodes.binary_search_by(|node| { |
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159 match node.base_name(on_disk) { |
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160 Ok(node_base_name) => node_base_name.cmp(base_name), |
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161 Err(e) => { |
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162 parse_result = Err(e); |
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163 // Dummy comparison result, `search_result` won’t |
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164 // be used since `parse_result` is an error |
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165 std::cmp::Ordering::Equal |
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166 } |
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167 } |
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168 }); |
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169 parse_result.map(|()| { |
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170 search_result.ok().map(|i| NodeRef::OnDisk(&nodes[i])) |
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171 }) |
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172 } |
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173 } |
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174 } |
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175 |
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176 /// Iterate in undefined order |
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177 pub(super) fn iter( |
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178 &self, |
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179 ) -> impl Iterator<Item = NodeRef<'tree, 'on_disk>> { |
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180 match self { |
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181 ChildNodesRef::InMemory(nodes) => itertools::Either::Left( |
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182 nodes.iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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183 ), |
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184 ChildNodesRef::OnDisk(nodes) => { |
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185 itertools::Either::Right(nodes.iter().map(NodeRef::OnDisk)) |
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186 } |
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187 } |
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188 } |
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189 |
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190 /// Iterate in parallel in undefined order |
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191 pub(super) fn par_iter( |
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192 &self, |
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193 ) -> impl rayon::iter::ParallelIterator<Item = NodeRef<'tree, 'on_disk>> |
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194 { |
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195 use rayon::prelude::*; |
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196 match self { |
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197 ChildNodesRef::InMemory(nodes) => rayon::iter::Either::Left( |
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198 nodes.par_iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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199 ), |
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200 ChildNodesRef::OnDisk(nodes) => rayon::iter::Either::Right( |
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201 nodes.par_iter().map(NodeRef::OnDisk), |
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202 ), |
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203 } |
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204 } |
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205 |
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206 pub(super) fn sorted(&self) -> Vec<NodeRef<'tree, 'on_disk>> { |
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207 match self { |
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208 ChildNodesRef::InMemory(nodes) => { |
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209 let mut vec: Vec<_> = nodes |
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210 .iter() |
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211 .map(|(k, v)| NodeRef::InMemory(k, v)) |
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212 .collect(); |
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213 fn sort_key<'a>(node: &'a NodeRef) -> &'a HgPath { |
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214 match node { |
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215 NodeRef::InMemory(path, _node) => path.base_name(), |
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216 NodeRef::OnDisk(_) => unreachable!(), |
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217 } |
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218 } |
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219 // `sort_unstable_by_key` doesn’t allow keys borrowing from the |
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220 // value: https://github.com/rust-lang/rust/issues/34162 |
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221 vec.sort_unstable_by(|a, b| sort_key(a).cmp(sort_key(b))); |
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222 vec |
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223 } |
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224 ChildNodesRef::OnDisk(nodes) => { |
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225 // Nodes on disk are already sorted |
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226 nodes.iter().map(NodeRef::OnDisk).collect() |
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227 } |
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228 } |
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229 } |
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230 } |
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231 |
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232 impl<'tree, 'on_disk> NodeRef<'tree, 'on_disk> { |
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233 pub(super) fn full_path( |
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234 &self, |
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235 on_disk: &'on_disk [u8], |
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236 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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237 match self { |
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238 NodeRef::InMemory(path, _node) => Ok(path.full_path()), |
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239 NodeRef::OnDisk(node) => node.full_path(on_disk), |
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240 } |
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241 } |
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242 |
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243 /// Returns a `BorrowedPath`, which can be turned into a `Cow<'on_disk, |
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244 /// HgPath>` detached from `'tree` |
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245 pub(super) fn full_path_borrowed( |
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246 &self, |
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247 on_disk: &'on_disk [u8], |
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248 ) -> Result<BorrowedPath<'tree, 'on_disk>, DirstateV2ParseError> { |
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249 match self { |
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250 NodeRef::InMemory(path, _node) => match path.full_path() { |
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251 Cow::Borrowed(on_disk) => Ok(BorrowedPath::OnDisk(on_disk)), |
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252 Cow::Owned(in_memory) => Ok(BorrowedPath::InMemory(in_memory)), |
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253 }, |
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254 NodeRef::OnDisk(node) => { |
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255 Ok(BorrowedPath::OnDisk(node.full_path(on_disk)?)) |
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256 } |
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257 } |
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258 } |
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259 |
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260 pub(super) fn base_name( |
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261 &self, |
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262 on_disk: &'on_disk [u8], |
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263 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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264 match self { |
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265 NodeRef::InMemory(path, _node) => Ok(path.base_name()), |
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266 NodeRef::OnDisk(node) => node.base_name(on_disk), |
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267 } |
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268 } |
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269 |
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270 pub(super) fn children( |
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271 &self, |
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272 on_disk: &'on_disk [u8], |
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273 ) -> Result<ChildNodesRef<'tree, 'on_disk>, DirstateV2ParseError> { |
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274 match self { |
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275 NodeRef::InMemory(_path, node) => Ok(node.children.as_ref()), |
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276 NodeRef::OnDisk(node) => { |
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277 Ok(ChildNodesRef::OnDisk(node.children(on_disk)?)) |
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278 } |
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279 } |
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280 } |
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281 |
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282 pub(super) fn has_copy_source(&self) -> bool { |
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283 match self { |
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284 NodeRef::InMemory(_path, node) => node.copy_source.is_some(), |
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285 NodeRef::OnDisk(node) => node.has_copy_source(), |
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286 } |
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287 } |
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288 |
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289 pub(super) fn copy_source( |
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290 &self, |
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291 on_disk: &'on_disk [u8], |
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292 ) -> Result<Option<&'tree HgPath>, DirstateV2ParseError> { |
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293 match self { |
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294 NodeRef::InMemory(_path, node) => { |
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295 Ok(node.copy_source.as_ref().map(|s| &**s)) |
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296 } |
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297 NodeRef::OnDisk(node) => node.copy_source(on_disk), |
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298 } |
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299 } |
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300 |
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301 pub(super) fn entry( |
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302 &self, |
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303 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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304 match self { |
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305 NodeRef::InMemory(_path, node) => { |
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306 Ok(node.data.as_entry().copied()) |
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307 } |
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308 NodeRef::OnDisk(node) => node.entry(), |
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309 } |
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310 } |
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311 |
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312 pub(super) fn state( |
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313 &self, |
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314 ) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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315 match self { |
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316 NodeRef::InMemory(_path, node) => { |
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317 Ok(node.data.as_entry().map(|entry| entry.state)) |
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318 } |
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319 NodeRef::OnDisk(node) => node.state(), |
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320 } |
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321 } |
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322 |
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323 pub(super) fn cached_directory_mtime( |
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324 &self, |
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325 ) -> Option<&'tree on_disk::Timestamp> { |
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326 match self { |
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327 NodeRef::InMemory(_path, node) => match &node.data { |
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328 NodeData::CachedDirectory { mtime } => Some(mtime), |
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329 _ => None, |
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330 }, |
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331 NodeRef::OnDisk(node) => node.cached_directory_mtime(), |
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332 } |
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333 } |
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334 |
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335 pub(super) fn tracked_descendants_count(&self) -> u32 { |
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336 match self { |
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337 NodeRef::InMemory(_path, node) => node.tracked_descendants_count, |
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338 NodeRef::OnDisk(node) => node.tracked_descendants_count.get(), |
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339 } |
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340 } |
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341 } |
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342 |
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343 /// Represents a file or a directory |
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344 #[derive(Default)] |
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345 pub(super) struct Node<'on_disk> { |
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346 pub(super) data: NodeData, |
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347 |
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348 pub(super) copy_source: Option<Cow<'on_disk, HgPath>>, |
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349 |
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350 pub(super) children: ChildNodes<'on_disk>, |
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351 |
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352 /// How many (non-inclusive) descendants of this node are tracked files |
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353 pub(super) tracked_descendants_count: u32, |
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354 } |
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355 |
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356 pub(super) enum NodeData { |
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357 Entry(DirstateEntry), |
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358 CachedDirectory { mtime: on_disk::Timestamp }, |
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359 None, |
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360 } |
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361 |
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362 impl Default for NodeData { |
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363 fn default() -> Self { |
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364 NodeData::None |
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365 } |
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366 } |
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367 |
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368 impl NodeData { |
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369 fn has_entry(&self) -> bool { |
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370 match self { |
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371 NodeData::Entry(_) => true, |
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372 _ => false, |
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373 } |
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374 } |
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375 |
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376 fn as_entry(&self) -> Option<&DirstateEntry> { |
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377 match self { |
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378 NodeData::Entry(entry) => Some(entry), |
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379 _ => None, |
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380 } |
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381 } |
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382 } |
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383 |
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384 impl<'on_disk> DirstateMap<'on_disk> { |
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385 pub(super) fn empty(on_disk: &'on_disk [u8]) -> Self { |
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386 Self { |
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387 on_disk, |
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388 root: ChildNodes::default(), |
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389 nodes_with_entry_count: 0, |
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390 nodes_with_copy_source_count: 0, |
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391 ignore_patterns_hash: [0; on_disk::IGNORE_PATTERNS_HASH_LEN], |
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392 } |
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393 } |
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394 |
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395 #[timed] |
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396 pub fn new_v2( |
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397 on_disk: &'on_disk [u8], |
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398 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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399 Ok(on_disk::read(on_disk)?) |
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400 } |
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401 |
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402 #[timed] |
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403 pub fn new_v1( |
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404 on_disk: &'on_disk [u8], |
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405 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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406 let mut map = Self::empty(on_disk); |
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407 if map.on_disk.is_empty() { |
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408 return Ok((map, None)); |
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409 } |
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410 |
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411 let parents = parse_dirstate_entries( |
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412 map.on_disk, |
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413 |path, entry, copy_source| { |
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414 let tracked = entry.state.is_tracked(); |
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415 let node = Self::get_or_insert_node( |
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416 map.on_disk, |
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417 &mut map.root, |
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418 path, |
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419 WithBasename::to_cow_borrowed, |
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420 |ancestor| { |
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421 if tracked { |
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422 ancestor.tracked_descendants_count += 1 |
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423 } |
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424 }, |
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425 )?; |
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426 assert!( |
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427 !node.data.has_entry(), |
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428 "duplicate dirstate entry in read" |
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429 ); |
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430 assert!( |
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431 node.copy_source.is_none(), |
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432 "duplicate dirstate entry in read" |
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433 ); |
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434 node.data = NodeData::Entry(*entry); |
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435 node.copy_source = copy_source.map(Cow::Borrowed); |
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436 map.nodes_with_entry_count += 1; |
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437 if copy_source.is_some() { |
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438 map.nodes_with_copy_source_count += 1 |
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439 } |
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440 Ok(()) |
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441 }, |
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442 )?; |
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443 let parents = Some(parents.clone()); |
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444 |
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445 Ok((map, parents)) |
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446 } |
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447 |
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448 fn get_node<'tree>( |
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449 &'tree self, |
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450 path: &HgPath, |
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451 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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452 let mut children = self.root.as_ref(); |
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453 let mut components = path.components(); |
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454 let mut component = |
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455 components.next().expect("expected at least one components"); |
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456 loop { |
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457 if let Some(child) = children.get(component, self.on_disk)? { |
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458 if let Some(next_component) = components.next() { |
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459 component = next_component; |
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460 children = child.children(self.on_disk)?; |
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461 } else { |
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462 return Ok(Some(child)); |
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463 } |
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464 } else { |
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465 return Ok(None); |
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466 } |
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467 } |
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468 } |
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469 |
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470 /// Returns a mutable reference to the node at `path` if it exists |
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471 /// |
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472 /// This takes `root` instead of `&mut self` so that callers can mutate |
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473 /// other fields while the returned borrow is still valid |
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474 fn get_node_mut<'tree>( |
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475 on_disk: &'on_disk [u8], |
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476 root: &'tree mut ChildNodes<'on_disk>, |
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477 path: &HgPath, |
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478 ) -> Result<Option<&'tree mut Node<'on_disk>>, DirstateV2ParseError> { |
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479 let mut children = root; |
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480 let mut components = path.components(); |
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481 let mut component = |
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482 components.next().expect("expected at least one components"); |
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483 loop { |
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484 if let Some(child) = children.make_mut(on_disk)?.get_mut(component) |
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485 { |
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486 if let Some(next_component) = components.next() { |
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487 component = next_component; |
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488 children = &mut child.children; |
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489 } else { |
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490 return Ok(Some(child)); |
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491 } |
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492 } else { |
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493 return Ok(None); |
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494 } |
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495 } |
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496 } |
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497 |
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498 pub(super) fn get_or_insert<'tree, 'path>( |
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499 &'tree mut self, |
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500 path: &HgPath, |
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501 ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> { |
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502 Self::get_or_insert_node( |
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503 self.on_disk, |
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504 &mut self.root, |
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505 path, |
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506 WithBasename::to_cow_owned, |
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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 pub(super) fn get_or_insert_node<'tree, 'path>( |
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512 on_disk: &'on_disk [u8], |
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513 root: &'tree mut ChildNodes<'on_disk>, |
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514 path: &'path HgPath, |
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515 to_cow: impl Fn( |
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516 WithBasename<&'path HgPath>, |
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517 ) -> WithBasename<Cow<'on_disk, HgPath>>, |
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518 mut each_ancestor: impl FnMut(&mut Node), |
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519 ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> { |
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520 let mut child_nodes = root; |
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521 let mut inclusive_ancestor_paths = |
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522 WithBasename::inclusive_ancestors_of(path); |
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523 let mut ancestor_path = inclusive_ancestor_paths |
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524 .next() |
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525 .expect("expected at least one inclusive ancestor"); |
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526 loop { |
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527 // TODO: can we avoid allocating an owned key in cases where the |
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528 // map already contains that key, without introducing double |
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529 // lookup? |
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530 let child_node = child_nodes |
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531 .make_mut(on_disk)? |
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532 .entry(to_cow(ancestor_path)) |
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533 .or_default(); |
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534 if let Some(next) = inclusive_ancestor_paths.next() { |
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535 each_ancestor(child_node); |
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536 ancestor_path = next; |
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537 child_nodes = &mut child_node.children; |
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538 } else { |
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539 return Ok(child_node); |
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540 } |
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541 } |
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542 } |
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543 |
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544 fn add_or_remove_file( |
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545 &mut self, |
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546 path: &HgPath, |
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547 old_state: EntryState, |
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548 new_entry: DirstateEntry, |
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549 ) -> Result<(), DirstateV2ParseError> { |
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550 let tracked_count_increment = |
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551 match (old_state.is_tracked(), new_entry.state.is_tracked()) { |
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552 (false, true) => 1, |
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553 (true, false) => -1, |
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554 _ => 0, |
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555 }; |
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556 |
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557 let node = Self::get_or_insert_node( |
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558 self.on_disk, |
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559 &mut self.root, |
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560 path, |
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561 WithBasename::to_cow_owned, |
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562 |ancestor| { |
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563 // We can’t use `+= increment` because the counter is unsigned, |
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564 // and we want debug builds to detect accidental underflow |
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565 // through zero |
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566 match tracked_count_increment { |
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567 1 => ancestor.tracked_descendants_count += 1, |
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568 -1 => ancestor.tracked_descendants_count -= 1, |
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569 _ => {} |
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570 } |
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571 }, |
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572 )?; |
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573 if !node.data.has_entry() { |
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574 self.nodes_with_entry_count += 1 |
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575 } |
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576 node.data = NodeData::Entry(new_entry); |
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577 Ok(()) |
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578 } |
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579 |
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580 fn iter_nodes<'tree>( |
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581 &'tree self, |
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582 ) -> impl Iterator< |
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583 Item = Result<NodeRef<'tree, 'on_disk>, DirstateV2ParseError>, |
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584 > + 'tree { |
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585 // Depth first tree traversal. |
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586 // |
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587 // If we could afford internal iteration and recursion, |
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588 // this would look like: |
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589 // |
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590 // ``` |
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591 // fn traverse_children( |
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592 // children: &ChildNodes, |
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593 // each: &mut impl FnMut(&Node), |
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594 // ) { |
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595 // for child in children.values() { |
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596 // traverse_children(&child.children, each); |
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597 // each(child); |
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598 // } |
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599 // } |
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600 // ``` |
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601 // |
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602 // However we want an external iterator and therefore can’t use the |
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603 // call stack. Use an explicit stack instead: |
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604 let mut stack = Vec::new(); |
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605 let mut iter = self.root.as_ref().iter(); |
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606 std::iter::from_fn(move || { |
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607 while let Some(child_node) = iter.next() { |
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608 let children = match child_node.children(self.on_disk) { |
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609 Ok(children) => children, |
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610 Err(error) => return Some(Err(error)), |
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611 }; |
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612 // Pseudo-recursion |
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613 let new_iter = children.iter(); |
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614 let old_iter = std::mem::replace(&mut iter, new_iter); |
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615 stack.push((child_node, old_iter)); |
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616 } |
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617 // Found the end of a `children.iter()` iterator. |
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618 if let Some((child_node, next_iter)) = stack.pop() { |
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619 // "Return" from pseudo-recursion by restoring state from the |
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620 // explicit stack |
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621 iter = next_iter; |
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622 |
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623 Some(Ok(child_node)) |
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624 } else { |
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625 // Reached the bottom of the stack, we’re done |
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626 None |
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627 } |
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628 }) |
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629 } |
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630 |
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631 fn clear_known_ambiguous_mtimes( |
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632 &mut self, |
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633 paths: &[impl AsRef<HgPath>], |
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634 ) -> Result<(), DirstateV2ParseError> { |
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635 for path in paths { |
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636 if let Some(node) = Self::get_node_mut( |
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637 self.on_disk, |
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638 &mut self.root, |
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639 path.as_ref(), |
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640 )? { |
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641 if let NodeData::Entry(entry) = &mut node.data { |
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642 entry.clear_mtime(); |
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643 } |
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644 } |
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645 } |
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646 Ok(()) |
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647 } |
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648 |
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649 /// Return a faillilble iterator of full paths of nodes that have an |
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650 /// `entry` for which the given `predicate` returns true. |
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651 /// |
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652 /// Fallibility means that each iterator item is a `Result`, which may |
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653 /// indicate a parse error of the on-disk dirstate-v2 format. Such errors |
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654 /// should only happen if Mercurial is buggy or a repository is corrupted. |
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655 fn filter_full_paths<'tree>( |
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656 &'tree self, |
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657 predicate: impl Fn(&DirstateEntry) -> bool + 'tree, |
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658 ) -> impl Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + 'tree |
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659 { |
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660 filter_map_results(self.iter_nodes(), move |node| { |
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661 if let Some(entry) = node.entry()? { |
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662 if predicate(&entry) { |
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663 return Ok(Some(node.full_path(self.on_disk)?)); |
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664 } |
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665 } |
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666 Ok(None) |
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667 }) |
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668 } |
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669 } |
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670 |
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671 /// Like `Iterator::filter_map`, but over a fallible iterator of `Result`s. |
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672 /// |
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673 /// The callback is only called for incoming `Ok` values. Errors are passed |
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674 /// through as-is. In order to let it use the `?` operator the callback is |
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675 /// expected to return a `Result` of `Option`, instead of an `Option` of |
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676 /// `Result`. |
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677 fn filter_map_results<'a, I, F, A, B, E>( |
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678 iter: I, |
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679 f: F, |
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680 ) -> impl Iterator<Item = Result<B, E>> + 'a |
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681 where |
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682 I: Iterator<Item = Result<A, E>> + 'a, |
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683 F: Fn(A) -> Result<Option<B>, E> + 'a, |
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684 { |
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685 iter.filter_map(move |result| match result { |
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686 Ok(node) => f(node).transpose(), |
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687 Err(e) => Some(Err(e)), |
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688 }) |
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689 } |
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690 |
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691 impl<'on_disk> super::dispatch::DirstateMapMethods for DirstateMap<'on_disk> { |
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692 fn clear(&mut self) { |
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693 self.root = Default::default(); |
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694 self.nodes_with_entry_count = 0; |
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695 self.nodes_with_copy_source_count = 0; |
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696 } |
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697 |
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698 fn add_file( |
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699 &mut self, |
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700 filename: &HgPath, |
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701 old_state: EntryState, |
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702 entry: DirstateEntry, |
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703 ) -> Result<(), DirstateError> { |
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704 Ok(self.add_or_remove_file(filename, old_state, entry)?) |
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705 } |
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706 |
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707 fn remove_file( |
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708 &mut self, |
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709 filename: &HgPath, |
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710 old_state: EntryState, |
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711 size: i32, |
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712 ) -> Result<(), DirstateError> { |
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713 let entry = DirstateEntry { |
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714 state: EntryState::Removed, |
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715 mode: 0, |
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716 size, |
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717 mtime: 0, |
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718 }; |
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719 Ok(self.add_or_remove_file(filename, old_state, entry)?) |
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720 } |
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721 |
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722 fn drop_file( |
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723 &mut self, |
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724 filename: &HgPath, |
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725 old_state: EntryState, |
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726 ) -> Result<bool, DirstateError> { |
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727 struct Dropped { |
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728 was_tracked: bool, |
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729 had_entry: bool, |
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730 had_copy_source: bool, |
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731 } |
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732 |
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733 /// If this returns `Ok(Some((dropped, removed)))`, then |
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734 /// |
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735 /// * `dropped` is about the leaf node that was at `filename` |
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736 /// * `removed` is whether this particular level of recursion just |
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737 /// removed a node in `nodes`. |
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738 fn recur<'on_disk>( |
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739 on_disk: &'on_disk [u8], |
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740 nodes: &mut ChildNodes<'on_disk>, |
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741 path: &HgPath, |
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742 ) -> Result<Option<(Dropped, bool)>, DirstateV2ParseError> { |
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743 let (first_path_component, rest_of_path) = |
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744 path.split_first_component(); |
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745 let node = if let Some(node) = |
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746 nodes.make_mut(on_disk)?.get_mut(first_path_component) |
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747 { |
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748 node |
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749 } else { |
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750 return Ok(None); |
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751 }; |
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752 let dropped; |
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753 if let Some(rest) = rest_of_path { |
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754 if let Some((d, removed)) = |
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755 recur(on_disk, &mut node.children, rest)? |
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756 { |
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757 dropped = d; |
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758 if dropped.was_tracked { |
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759 node.tracked_descendants_count -= 1; |
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760 } |
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761 |
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762 // Directory caches must be invalidated when removing a |
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763 // child node |
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764 if removed { |
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765 if let NodeData::CachedDirectory { .. } = &node.data { |
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766 node.data = NodeData::None |
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767 } |
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768 } |
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769 } else { |
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770 return Ok(None); |
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771 } |
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772 } else { |
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773 let had_entry = node.data.has_entry(); |
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774 if had_entry { |
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775 node.data = NodeData::None |
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776 } |
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777 dropped = Dropped { |
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778 was_tracked: node |
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779 .data |
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780 .as_entry() |
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781 .map_or(false, |entry| entry.state.is_tracked()), |
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782 had_entry, |
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783 had_copy_source: node.copy_source.take().is_some(), |
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784 }; |
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785 } |
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786 // After recursion, for both leaf (rest_of_path is None) nodes and |
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787 // parent nodes, remove a node if it just became empty. |
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788 let remove = !node.data.has_entry() |
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789 && node.copy_source.is_none() |
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790 && node.children.is_empty(); |
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791 if remove { |
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792 nodes.make_mut(on_disk)?.remove(first_path_component); |
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793 } |
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794 Ok(Some((dropped, remove))) |
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795 } |
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796 |
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797 if let Some((dropped, _removed)) = |
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798 recur(self.on_disk, &mut self.root, filename)? |
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799 { |
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800 if dropped.had_entry { |
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801 self.nodes_with_entry_count -= 1 |
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|
802 } |
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803 if dropped.had_copy_source { |
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|
804 self.nodes_with_copy_source_count -= 1 |
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805 } |
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806 Ok(dropped.had_entry) |
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807 } else { |
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808 debug_assert!(!old_state.is_tracked()); |
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809 Ok(false) |
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810 } |
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811 } |
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812 |
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813 fn clear_ambiguous_times( |
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814 &mut self, |
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815 filenames: Vec<HgPathBuf>, |
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816 now: i32, |
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817 ) -> Result<(), DirstateV2ParseError> { |
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818 for filename in filenames { |
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819 if let Some(node) = |
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820 Self::get_node_mut(self.on_disk, &mut self.root, &filename)? |
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821 { |
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822 if let NodeData::Entry(entry) = &mut node.data { |
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823 entry.clear_ambiguous_mtime(now); |
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824 } |
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825 } |
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826 } |
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827 Ok(()) |
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828 } |
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829 |
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830 fn non_normal_entries_contains( |
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831 &mut self, |
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832 key: &HgPath, |
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833 ) -> Result<bool, DirstateV2ParseError> { |
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834 Ok(if let Some(node) = self.get_node(key)? { |
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835 node.entry()?.map_or(false, |entry| entry.is_non_normal()) |
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836 } else { |
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837 false |
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838 }) |
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839 } |
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840 |
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841 fn non_normal_entries_remove(&mut self, _key: &HgPath) { |
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842 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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843 // entries" set that need to be kept up to date |
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844 } |
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845 |
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846 fn non_normal_or_other_parent_paths( |
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847 &mut self, |
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848 ) -> Box<dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + '_> |
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849 { |
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850 Box::new(self.filter_full_paths(|entry| { |
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851 entry.is_non_normal() || entry.is_from_other_parent() |
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852 })) |
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853 } |
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854 |
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855 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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856 // Do nothing, this `DirstateMap` does not have a separate "non normal |
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857 // entries" and "from other parent" sets that need to be recomputed |
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858 } |
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859 |
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860 fn iter_non_normal_paths( |
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861 &mut self, |
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862 ) -> Box< |
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863 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + Send + '_, |
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864 > { |
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865 self.iter_non_normal_paths_panic() |
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866 } |
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867 |
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868 fn iter_non_normal_paths_panic( |
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869 &self, |
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870 ) -> Box< |
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871 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + Send + '_, |
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872 > { |
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873 Box::new(self.filter_full_paths(|entry| entry.is_non_normal())) |
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874 } |
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875 |
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876 fn iter_other_parent_paths( |
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877 &mut self, |
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878 ) -> Box< |
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879 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> + Send + '_, |
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880 > { |
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881 Box::new(self.filter_full_paths(|entry| entry.is_from_other_parent())) |
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882 } |
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883 |
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884 fn has_tracked_dir( |
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885 &mut self, |
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886 directory: &HgPath, |
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887 ) -> Result<bool, DirstateError> { |
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888 if let Some(node) = self.get_node(directory)? { |
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889 // A node without a `DirstateEntry` was created to hold child |
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890 // nodes, and is therefore a directory. |
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891 let state = node.state()?; |
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892 Ok(state.is_none() && node.tracked_descendants_count() > 0) |
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893 } else { |
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894 Ok(false) |
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895 } |
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896 } |
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897 |
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898 fn has_dir(&mut self, directory: &HgPath) -> Result<bool, DirstateError> { |
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899 if let Some(node) = self.get_node(directory)? { |
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900 // A node without a `DirstateEntry` was created to hold child |
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901 // nodes, and is therefore a directory. |
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902 Ok(node.state()?.is_none()) |
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903 } else { |
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904 Ok(false) |
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905 } |
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906 } |
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907 |
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908 #[timed] |
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909 fn pack_v1( |
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910 &mut self, |
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911 parents: DirstateParents, |
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912 now: Timestamp, |
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|
913 ) -> Result<Vec<u8>, DirstateError> { |
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|
914 let now: i32 = now.0.try_into().expect("time overflow"); |
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915 let mut ambiguous_mtimes = Vec::new(); |
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916 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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917 // reallocations |
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918 let mut size = parents.as_bytes().len(); |
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|
919 for node in self.iter_nodes() { |
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920 let node = node?; |
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921 if let Some(entry) = node.entry()? { |
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922 size += packed_entry_size( |
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923 node.full_path(self.on_disk)?, |
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924 node.copy_source(self.on_disk)?, |
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925 ); |
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926 if entry.mtime_is_ambiguous(now) { |
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927 ambiguous_mtimes.push( |
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928 node.full_path_borrowed(self.on_disk)? |
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929 .detach_from_tree(), |
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930 ) |
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931 } |
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932 } |
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933 } |
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934 self.clear_known_ambiguous_mtimes(&ambiguous_mtimes)?; |
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935 |
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936 let mut packed = Vec::with_capacity(size); |
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937 packed.extend(parents.as_bytes()); |
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938 |
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|
939 for node in self.iter_nodes() { |
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940 let node = node?; |
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941 if let Some(entry) = node.entry()? { |
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942 pack_entry( |
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943 node.full_path(self.on_disk)?, |
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944 &entry, |
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945 node.copy_source(self.on_disk)?, |
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946 &mut packed, |
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947 ); |
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948 } |
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949 } |
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950 Ok(packed) |
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951 } |
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952 |
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953 #[timed] |
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954 fn pack_v2( |
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955 &mut self, |
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956 parents: DirstateParents, |
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957 now: Timestamp, |
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958 ) -> Result<Vec<u8>, DirstateError> { |
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959 // TODO: how do we want to handle this in 2038? |
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960 let now: i32 = now.0.try_into().expect("time overflow"); |
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961 let mut paths = Vec::new(); |
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|
962 for node in self.iter_nodes() { |
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963 let node = node?; |
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964 if let Some(entry) = node.entry()? { |
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965 if entry.mtime_is_ambiguous(now) { |
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966 paths.push( |
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967 node.full_path_borrowed(self.on_disk)? |
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968 .detach_from_tree(), |
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969 ) |
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970 } |
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971 } |
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972 } |
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|
973 // Borrow of `self` ends here since we collect cloned paths |
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974 |
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975 self.clear_known_ambiguous_mtimes(&paths)?; |
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976 |
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|
977 on_disk::write(self, parents) |
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978 } |
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979 |
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980 fn status<'a>( |
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981 &'a mut self, |
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982 matcher: &'a (dyn Matcher + Sync), |
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983 root_dir: PathBuf, |
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984 ignore_files: Vec<PathBuf>, |
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985 options: StatusOptions, |
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986 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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987 { |
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988 super::status::status(self, matcher, root_dir, ignore_files, options) |
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989 } |
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990 |
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991 fn copy_map_len(&self) -> usize { |
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992 self.nodes_with_copy_source_count as usize |
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993 } |
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994 |
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995 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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996 Box::new(filter_map_results(self.iter_nodes(), move |node| { |
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997 Ok(if let Some(source) = node.copy_source(self.on_disk)? { |
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998 Some((node.full_path(self.on_disk)?, source)) |
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999 } else { |
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1000 None |
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1001 }) |
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1002 })) |
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1003 } |
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1004 |
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1005 fn copy_map_contains_key( |
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1006 &self, |
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1007 key: &HgPath, |
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1008 ) -> Result<bool, DirstateV2ParseError> { |
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1009 Ok(if let Some(node) = self.get_node(key)? { |
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1010 node.has_copy_source() |
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1011 } else { |
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1012 false |
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1013 }) |
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1014 } |
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1015 |
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1016 fn copy_map_get( |
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1017 &self, |
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1018 key: &HgPath, |
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1019 ) -> Result<Option<&HgPath>, DirstateV2ParseError> { |
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1020 if let Some(node) = self.get_node(key)? { |
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1021 if let Some(source) = node.copy_source(self.on_disk)? { |
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1022 return Ok(Some(source)); |
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1023 } |
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1024 } |
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1025 Ok(None) |
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1026 } |
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1027 |
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1028 fn copy_map_remove( |
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1029 &mut self, |
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1030 key: &HgPath, |
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1031 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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1032 let count = &mut self.nodes_with_copy_source_count; |
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1033 Ok( |
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1034 Self::get_node_mut(self.on_disk, &mut self.root, key)?.and_then( |
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1035 |node| { |
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1036 if node.copy_source.is_some() { |
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1037 *count -= 1 |
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1038 } |
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1039 node.copy_source.take().map(Cow::into_owned) |
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1040 }, |
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1041 ), |
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1042 ) |
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1043 } |
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1044 |
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1045 fn copy_map_insert( |
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1046 &mut self, |
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1047 key: HgPathBuf, |
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1048 value: HgPathBuf, |
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1049 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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1050 let node = Self::get_or_insert_node( |
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1051 self.on_disk, |
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1052 &mut self.root, |
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1053 &key, |
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1054 WithBasename::to_cow_owned, |
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1055 |_ancestor| {}, |
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1056 )?; |
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1057 if node.copy_source.is_none() { |
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1058 self.nodes_with_copy_source_count += 1 |
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1059 } |
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1060 Ok(node.copy_source.replace(value.into()).map(Cow::into_owned)) |
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1061 } |
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1062 |
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1063 fn len(&self) -> usize { |
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1064 self.nodes_with_entry_count as usize |
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1065 } |
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1066 |
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1067 fn contains_key( |
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1068 &self, |
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1069 key: &HgPath, |
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1070 ) -> Result<bool, DirstateV2ParseError> { |
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1071 Ok(self.get(key)?.is_some()) |
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1072 } |
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1073 |
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1074 fn get( |
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1075 &self, |
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1076 key: &HgPath, |
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1077 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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1078 Ok(if let Some(node) = self.get_node(key)? { |
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1079 node.entry()? |
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1080 } else { |
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1081 None |
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1082 }) |
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1083 } |
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1084 |
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1085 fn iter(&self) -> StateMapIter<'_> { |
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1086 Box::new(filter_map_results(self.iter_nodes(), move |node| { |
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1087 Ok(if let Some(entry) = node.entry()? { |
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1088 Some((node.full_path(self.on_disk)?, entry)) |
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1089 } else { |
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1090 None |
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1091 }) |
47100
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1092 })) |
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1093 } |
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1094 |
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1095 fn iter_directories( |
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1096 &self, |
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1097 ) -> Box< |
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1098 dyn Iterator< |
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1099 Item = Result< |
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1100 (&HgPath, Option<Timestamp>), |
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1101 DirstateV2ParseError, |
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1102 >, |
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1103 > + Send |
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1104 + '_, |
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1105 > { |
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1106 Box::new(filter_map_results(self.iter_nodes(), move |node| { |
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1107 Ok(if node.state()?.is_none() { |
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1108 Some(( |
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1109 node.full_path(self.on_disk)?, |
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1110 node.cached_directory_mtime() |
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1111 .map(|mtime| Timestamp(mtime.seconds())), |
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1112 )) |
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1113 } else { |
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1114 None |
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1115 }) |
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1116 })) |
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dirstate-v2: Add --dirs to debugdirstate command
Simon Sapin <simon.sapin@octobus.net>
parents:
47349
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changeset
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1117 } |
47095
473abf4728bf
dirstate-tree: Empty shell for a second Rust DirstateMap implementation
Simon Sapin <simon.sapin@octobus.net>
parents:
diff
changeset
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1118 } |