Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 48392:434de12918fd
dirstate: remove need_delay logic
Now that all¹ stored mtime are non ambiguous, we no longer need to apply the `need_delay` step.
The need delay logic was not great are mtime gathered during longer operation
could be ambiguous but younger than the `dirstate.write` call time.
So, we don't need that logic anymore and can drop it
This make the code much simpler. The code related to the test extension faking
the dirstate write is now obsolete and associated test will be migrated as
follow up. They currently do not break.
[1] except the ones from `hg update`, but `need_delay` no longer help for them
either.
Differential Revision: https://phab.mercurial-scm.org/D11796
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 19 Nov 2021 03:04:42 +0100 |
parents | 269ff8978086 |
children | c1b633db67fc |
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::path::PathBuf; |
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5 |
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6 use super::on_disk; |
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7 use super::on_disk::DirstateV2ParseError; |
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8 use super::owning::OwningDirstateMap; |
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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::CopyMapIter; |
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14 use crate::dirstate::StateMapIter; |
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15 use crate::dirstate::TruncatedTimestamp; |
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16 use crate::dirstate::SIZE_FROM_OTHER_PARENT; |
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17 use crate::dirstate::SIZE_NON_NORMAL; |
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18 use crate::matchers::Matcher; |
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19 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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20 use crate::DirstateEntry; |
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21 use crate::DirstateError; |
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22 use crate::DirstateParents; |
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23 use crate::DirstateStatus; |
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24 use crate::EntryState; |
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25 use crate::FastHashMap; |
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26 use crate::PatternFileWarning; |
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27 use crate::StatusError; |
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28 use crate::StatusOptions; |
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29 |
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30 /// Append to an existing data file if the amount of unreachable data (not used |
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31 /// anymore) is less than this fraction of the total amount of existing data. |
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32 const ACCEPTABLE_UNREACHABLE_BYTES_RATIO: f32 = 0.5; |
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33 |
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34 pub struct DirstateMap<'on_disk> { |
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35 /// Contents of the `.hg/dirstate` file |
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36 pub(super) on_disk: &'on_disk [u8], |
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37 |
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38 pub(super) root: ChildNodes<'on_disk>, |
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39 |
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40 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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41 pub(super) nodes_with_entry_count: u32, |
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42 |
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43 /// Number of nodes anywhere in the tree that have |
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44 /// `.copy_source.is_some()`. |
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45 pub(super) nodes_with_copy_source_count: u32, |
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46 |
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47 /// See on_disk::Header |
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48 pub(super) ignore_patterns_hash: on_disk::IgnorePatternsHash, |
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49 |
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50 /// How many bytes of `on_disk` are not used anymore |
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51 pub(super) unreachable_bytes: u32, |
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52 } |
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53 |
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54 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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55 /// map key would also work: all paths in a given map have the same parent |
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56 /// path, so comparing full paths gives the same result as comparing base |
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57 /// names. However `HashMap` would waste time always re-hashing the same |
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58 /// string prefix. |
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59 pub(super) type NodeKey<'on_disk> = WithBasename<Cow<'on_disk, HgPath>>; |
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60 |
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61 /// Similar to `&'tree Cow<'on_disk, HgPath>`, but can also be returned |
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62 /// for on-disk nodes that don’t actually have a `Cow` to borrow. |
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63 pub(super) enum BorrowedPath<'tree, 'on_disk> { |
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64 InMemory(&'tree HgPathBuf), |
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65 OnDisk(&'on_disk HgPath), |
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66 } |
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67 |
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68 pub(super) enum ChildNodes<'on_disk> { |
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69 InMemory(FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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70 OnDisk(&'on_disk [on_disk::Node]), |
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71 } |
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72 |
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73 pub(super) enum ChildNodesRef<'tree, 'on_disk> { |
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74 InMemory(&'tree FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>), |
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75 OnDisk(&'on_disk [on_disk::Node]), |
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76 } |
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77 |
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78 pub(super) enum NodeRef<'tree, 'on_disk> { |
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79 InMemory(&'tree NodeKey<'on_disk>, &'tree Node<'on_disk>), |
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80 OnDisk(&'on_disk on_disk::Node), |
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81 } |
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82 |
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83 impl<'tree, 'on_disk> BorrowedPath<'tree, 'on_disk> { |
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84 pub fn detach_from_tree(&self) -> Cow<'on_disk, HgPath> { |
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85 match *self { |
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86 BorrowedPath::InMemory(in_memory) => Cow::Owned(in_memory.clone()), |
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87 BorrowedPath::OnDisk(on_disk) => Cow::Borrowed(on_disk), |
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88 } |
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89 } |
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90 } |
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91 |
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92 impl<'tree, 'on_disk> std::ops::Deref for BorrowedPath<'tree, 'on_disk> { |
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93 type Target = HgPath; |
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94 |
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95 fn deref(&self) -> &HgPath { |
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96 match *self { |
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97 BorrowedPath::InMemory(in_memory) => in_memory, |
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98 BorrowedPath::OnDisk(on_disk) => on_disk, |
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99 } |
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100 } |
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101 } |
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102 |
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103 impl Default for ChildNodes<'_> { |
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104 fn default() -> Self { |
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105 ChildNodes::InMemory(Default::default()) |
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106 } |
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107 } |
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108 |
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109 impl<'on_disk> ChildNodes<'on_disk> { |
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110 pub(super) fn as_ref<'tree>( |
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111 &'tree self, |
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112 ) -> ChildNodesRef<'tree, 'on_disk> { |
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113 match self { |
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114 ChildNodes::InMemory(nodes) => ChildNodesRef::InMemory(nodes), |
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115 ChildNodes::OnDisk(nodes) => ChildNodesRef::OnDisk(nodes), |
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116 } |
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117 } |
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118 |
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119 pub(super) fn is_empty(&self) -> bool { |
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120 match self { |
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121 ChildNodes::InMemory(nodes) => nodes.is_empty(), |
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122 ChildNodes::OnDisk(nodes) => nodes.is_empty(), |
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123 } |
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124 } |
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125 |
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126 fn make_mut( |
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127 &mut self, |
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128 on_disk: &'on_disk [u8], |
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129 unreachable_bytes: &mut u32, |
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130 ) -> Result< |
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131 &mut FastHashMap<NodeKey<'on_disk>, Node<'on_disk>>, |
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132 DirstateV2ParseError, |
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133 > { |
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134 match self { |
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135 ChildNodes::InMemory(nodes) => Ok(nodes), |
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136 ChildNodes::OnDisk(nodes) => { |
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137 *unreachable_bytes += |
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138 std::mem::size_of_val::<[on_disk::Node]>(nodes) as u32; |
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139 let nodes = nodes |
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140 .iter() |
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141 .map(|node| { |
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142 Ok(( |
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143 node.path(on_disk)?, |
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144 node.to_in_memory_node(on_disk)?, |
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145 )) |
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146 }) |
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147 .collect::<Result<_, _>>()?; |
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148 *self = ChildNodes::InMemory(nodes); |
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149 match self { |
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150 ChildNodes::InMemory(nodes) => Ok(nodes), |
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151 ChildNodes::OnDisk(_) => unreachable!(), |
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152 } |
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153 } |
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154 } |
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155 } |
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156 } |
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157 |
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158 impl<'tree, 'on_disk> ChildNodesRef<'tree, 'on_disk> { |
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159 pub(super) fn get( |
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160 &self, |
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161 base_name: &HgPath, |
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162 on_disk: &'on_disk [u8], |
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163 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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164 match self { |
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165 ChildNodesRef::InMemory(nodes) => Ok(nodes |
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166 .get_key_value(base_name) |
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167 .map(|(k, v)| NodeRef::InMemory(k, v))), |
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168 ChildNodesRef::OnDisk(nodes) => { |
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169 let mut parse_result = Ok(()); |
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170 let search_result = nodes.binary_search_by(|node| { |
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171 match node.base_name(on_disk) { |
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172 Ok(node_base_name) => node_base_name.cmp(base_name), |
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173 Err(e) => { |
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174 parse_result = Err(e); |
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175 // Dummy comparison result, `search_result` won’t |
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176 // be used since `parse_result` is an error |
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177 std::cmp::Ordering::Equal |
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178 } |
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179 } |
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180 }); |
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181 parse_result.map(|()| { |
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182 search_result.ok().map(|i| NodeRef::OnDisk(&nodes[i])) |
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183 }) |
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184 } |
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185 } |
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186 } |
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187 |
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188 /// Iterate in undefined order |
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189 pub(super) fn iter( |
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190 &self, |
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191 ) -> impl Iterator<Item = NodeRef<'tree, 'on_disk>> { |
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192 match self { |
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193 ChildNodesRef::InMemory(nodes) => itertools::Either::Left( |
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194 nodes.iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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195 ), |
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196 ChildNodesRef::OnDisk(nodes) => { |
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197 itertools::Either::Right(nodes.iter().map(NodeRef::OnDisk)) |
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198 } |
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199 } |
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200 } |
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201 |
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202 /// Iterate in parallel in undefined order |
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203 pub(super) fn par_iter( |
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204 &self, |
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205 ) -> impl rayon::iter::ParallelIterator<Item = NodeRef<'tree, 'on_disk>> |
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206 { |
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207 use rayon::prelude::*; |
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208 match self { |
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209 ChildNodesRef::InMemory(nodes) => rayon::iter::Either::Left( |
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210 nodes.par_iter().map(|(k, v)| NodeRef::InMemory(k, v)), |
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211 ), |
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212 ChildNodesRef::OnDisk(nodes) => rayon::iter::Either::Right( |
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213 nodes.par_iter().map(NodeRef::OnDisk), |
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214 ), |
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215 } |
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216 } |
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217 |
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218 pub(super) fn sorted(&self) -> Vec<NodeRef<'tree, 'on_disk>> { |
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219 match self { |
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220 ChildNodesRef::InMemory(nodes) => { |
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221 let mut vec: Vec<_> = nodes |
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222 .iter() |
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223 .map(|(k, v)| NodeRef::InMemory(k, v)) |
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224 .collect(); |
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225 fn sort_key<'a>(node: &'a NodeRef) -> &'a HgPath { |
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226 match node { |
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227 NodeRef::InMemory(path, _node) => path.base_name(), |
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228 NodeRef::OnDisk(_) => unreachable!(), |
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229 } |
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230 } |
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231 // `sort_unstable_by_key` doesn’t allow keys borrowing from the |
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232 // value: https://github.com/rust-lang/rust/issues/34162 |
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233 vec.sort_unstable_by(|a, b| sort_key(a).cmp(sort_key(b))); |
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234 vec |
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235 } |
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236 ChildNodesRef::OnDisk(nodes) => { |
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237 // Nodes on disk are already sorted |
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238 nodes.iter().map(NodeRef::OnDisk).collect() |
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239 } |
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240 } |
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241 } |
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242 } |
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243 |
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244 impl<'tree, 'on_disk> NodeRef<'tree, 'on_disk> { |
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245 pub(super) fn full_path( |
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246 &self, |
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247 on_disk: &'on_disk [u8], |
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248 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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249 match self { |
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250 NodeRef::InMemory(path, _node) => Ok(path.full_path()), |
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251 NodeRef::OnDisk(node) => node.full_path(on_disk), |
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252 } |
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253 } |
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254 |
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255 /// Returns a `BorrowedPath`, which can be turned into a `Cow<'on_disk, |
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256 /// HgPath>` detached from `'tree` |
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257 pub(super) fn full_path_borrowed( |
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258 &self, |
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259 on_disk: &'on_disk [u8], |
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260 ) -> Result<BorrowedPath<'tree, 'on_disk>, DirstateV2ParseError> { |
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261 match self { |
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262 NodeRef::InMemory(path, _node) => match path.full_path() { |
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263 Cow::Borrowed(on_disk) => Ok(BorrowedPath::OnDisk(on_disk)), |
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264 Cow::Owned(in_memory) => Ok(BorrowedPath::InMemory(in_memory)), |
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265 }, |
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266 NodeRef::OnDisk(node) => { |
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267 Ok(BorrowedPath::OnDisk(node.full_path(on_disk)?)) |
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268 } |
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269 } |
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270 } |
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271 |
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272 pub(super) fn base_name( |
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273 &self, |
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274 on_disk: &'on_disk [u8], |
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275 ) -> Result<&'tree HgPath, DirstateV2ParseError> { |
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276 match self { |
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277 NodeRef::InMemory(path, _node) => Ok(path.base_name()), |
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278 NodeRef::OnDisk(node) => node.base_name(on_disk), |
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279 } |
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280 } |
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281 |
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282 pub(super) fn children( |
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283 &self, |
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284 on_disk: &'on_disk [u8], |
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285 ) -> Result<ChildNodesRef<'tree, 'on_disk>, DirstateV2ParseError> { |
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286 match self { |
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287 NodeRef::InMemory(_path, node) => Ok(node.children.as_ref()), |
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288 NodeRef::OnDisk(node) => { |
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289 Ok(ChildNodesRef::OnDisk(node.children(on_disk)?)) |
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290 } |
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291 } |
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292 } |
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293 |
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294 pub(super) fn has_copy_source(&self) -> bool { |
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295 match self { |
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296 NodeRef::InMemory(_path, node) => node.copy_source.is_some(), |
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297 NodeRef::OnDisk(node) => node.has_copy_source(), |
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298 } |
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299 } |
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300 |
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301 pub(super) fn copy_source( |
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302 &self, |
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303 on_disk: &'on_disk [u8], |
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304 ) -> Result<Option<&'tree HgPath>, DirstateV2ParseError> { |
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305 match self { |
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306 NodeRef::InMemory(_path, node) => { |
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307 Ok(node.copy_source.as_ref().map(|s| &**s)) |
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308 } |
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309 NodeRef::OnDisk(node) => node.copy_source(on_disk), |
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310 } |
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311 } |
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312 |
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313 pub(super) fn entry( |
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314 &self, |
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315 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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316 match self { |
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317 NodeRef::InMemory(_path, node) => { |
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318 Ok(node.data.as_entry().copied()) |
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319 } |
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320 NodeRef::OnDisk(node) => node.entry(), |
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321 } |
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322 } |
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323 |
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324 pub(super) fn state( |
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325 &self, |
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326 ) -> Result<Option<EntryState>, DirstateV2ParseError> { |
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327 Ok(self.entry()?.map(|e| e.state())) |
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328 } |
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329 |
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330 pub(super) fn cached_directory_mtime( |
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331 &self, |
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332 ) -> Result<Option<TruncatedTimestamp>, DirstateV2ParseError> { |
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333 match self { |
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334 NodeRef::InMemory(_path, node) => Ok(match node.data { |
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335 NodeData::CachedDirectory { mtime } => Some(mtime), |
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336 _ => None, |
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337 }), |
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338 NodeRef::OnDisk(node) => node.cached_directory_mtime(), |
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339 } |
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340 } |
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341 |
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342 pub(super) fn descendants_with_entry_count(&self) -> u32 { |
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343 match self { |
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344 NodeRef::InMemory(_path, node) => { |
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345 node.descendants_with_entry_count |
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346 } |
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347 NodeRef::OnDisk(node) => node.descendants_with_entry_count.get(), |
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348 } |
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349 } |
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350 |
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351 pub(super) fn tracked_descendants_count(&self) -> u32 { |
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352 match self { |
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353 NodeRef::InMemory(_path, node) => node.tracked_descendants_count, |
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354 NodeRef::OnDisk(node) => node.tracked_descendants_count.get(), |
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355 } |
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356 } |
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357 } |
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358 |
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359 /// Represents a file or a directory |
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360 #[derive(Default)] |
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361 pub(super) struct Node<'on_disk> { |
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362 pub(super) data: NodeData, |
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363 |
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364 pub(super) copy_source: Option<Cow<'on_disk, HgPath>>, |
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365 |
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366 pub(super) children: ChildNodes<'on_disk>, |
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367 |
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368 /// How many (non-inclusive) descendants of this node have an entry. |
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369 pub(super) descendants_with_entry_count: u32, |
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370 |
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371 /// How many (non-inclusive) descendants of this node have an entry whose |
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372 /// state is "tracked". |
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373 pub(super) tracked_descendants_count: u32, |
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374 } |
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375 |
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376 pub(super) enum NodeData { |
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377 Entry(DirstateEntry), |
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378 CachedDirectory { mtime: TruncatedTimestamp }, |
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379 None, |
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380 } |
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381 |
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382 impl Default for NodeData { |
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383 fn default() -> Self { |
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384 NodeData::None |
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385 } |
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386 } |
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387 |
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388 impl NodeData { |
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389 fn has_entry(&self) -> bool { |
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390 match self { |
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391 NodeData::Entry(_) => true, |
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392 _ => false, |
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393 } |
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394 } |
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395 |
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396 fn as_entry(&self) -> Option<&DirstateEntry> { |
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397 match self { |
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398 NodeData::Entry(entry) => Some(entry), |
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399 _ => None, |
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400 } |
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401 } |
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402 } |
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403 |
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404 impl<'on_disk> DirstateMap<'on_disk> { |
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405 pub(super) fn empty(on_disk: &'on_disk [u8]) -> Self { |
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406 Self { |
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407 on_disk, |
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408 root: ChildNodes::default(), |
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409 nodes_with_entry_count: 0, |
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410 nodes_with_copy_source_count: 0, |
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411 ignore_patterns_hash: [0; on_disk::IGNORE_PATTERNS_HASH_LEN], |
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412 unreachable_bytes: 0, |
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413 } |
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414 } |
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415 |
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416 #[timed] |
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417 pub fn new_v2( |
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418 on_disk: &'on_disk [u8], |
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419 data_size: usize, |
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420 metadata: &[u8], |
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421 ) -> Result<Self, DirstateError> { |
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422 if let Some(data) = on_disk.get(..data_size) { |
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423 Ok(on_disk::read(data, metadata)?) |
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424 } else { |
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425 Err(DirstateV2ParseError.into()) |
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426 } |
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427 } |
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428 |
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429 #[timed] |
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430 pub fn new_v1( |
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431 on_disk: &'on_disk [u8], |
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432 ) -> Result<(Self, Option<DirstateParents>), DirstateError> { |
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433 let mut map = Self::empty(on_disk); |
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434 if map.on_disk.is_empty() { |
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435 return Ok((map, None)); |
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436 } |
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437 |
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438 let parents = parse_dirstate_entries( |
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439 map.on_disk, |
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440 |path, entry, copy_source| { |
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441 let tracked = entry.state().is_tracked(); |
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442 let node = Self::get_or_insert_node( |
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443 map.on_disk, |
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444 &mut map.unreachable_bytes, |
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445 &mut map.root, |
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446 path, |
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447 WithBasename::to_cow_borrowed, |
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448 |ancestor| { |
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449 if tracked { |
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450 ancestor.tracked_descendants_count += 1 |
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451 } |
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452 ancestor.descendants_with_entry_count += 1 |
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453 }, |
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454 )?; |
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455 assert!( |
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456 !node.data.has_entry(), |
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457 "duplicate dirstate entry in read" |
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458 ); |
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459 assert!( |
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460 node.copy_source.is_none(), |
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461 "duplicate dirstate entry in read" |
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462 ); |
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463 node.data = NodeData::Entry(*entry); |
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464 node.copy_source = copy_source.map(Cow::Borrowed); |
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465 map.nodes_with_entry_count += 1; |
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466 if copy_source.is_some() { |
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467 map.nodes_with_copy_source_count += 1 |
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468 } |
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469 Ok(()) |
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470 }, |
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471 )?; |
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472 let parents = Some(parents.clone()); |
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473 |
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474 Ok((map, parents)) |
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475 } |
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476 |
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477 /// Assuming dirstate-v2 format, returns whether the next write should |
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478 /// append to the existing data file that contains `self.on_disk` (true), |
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479 /// or create a new data file from scratch (false). |
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480 pub(super) fn write_should_append(&self) -> bool { |
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481 let ratio = self.unreachable_bytes as f32 / self.on_disk.len() as f32; |
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482 ratio < ACCEPTABLE_UNREACHABLE_BYTES_RATIO |
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483 } |
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484 |
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485 fn get_node<'tree>( |
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486 &'tree self, |
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487 path: &HgPath, |
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488 ) -> Result<Option<NodeRef<'tree, 'on_disk>>, DirstateV2ParseError> { |
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489 let mut children = self.root.as_ref(); |
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490 let mut components = path.components(); |
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491 let mut component = |
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492 components.next().expect("expected at least one components"); |
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493 loop { |
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494 if let Some(child) = children.get(component, self.on_disk)? { |
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495 if let Some(next_component) = components.next() { |
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496 component = next_component; |
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497 children = child.children(self.on_disk)?; |
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498 } else { |
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499 return Ok(Some(child)); |
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500 } |
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501 } else { |
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502 return Ok(None); |
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503 } |
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504 } |
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505 } |
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506 |
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507 /// Returns a mutable reference to the node at `path` if it exists |
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508 /// |
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509 /// This takes `root` instead of `&mut self` so that callers can mutate |
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510 /// other fields while the returned borrow is still valid |
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511 fn get_node_mut<'tree>( |
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512 on_disk: &'on_disk [u8], |
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513 unreachable_bytes: &mut u32, |
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514 root: &'tree mut ChildNodes<'on_disk>, |
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515 path: &HgPath, |
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516 ) -> Result<Option<&'tree mut Node<'on_disk>>, DirstateV2ParseError> { |
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517 let mut children = root; |
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518 let mut components = path.components(); |
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519 let mut component = |
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520 components.next().expect("expected at least one components"); |
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521 loop { |
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522 if let Some(child) = children |
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523 .make_mut(on_disk, unreachable_bytes)? |
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524 .get_mut(component) |
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525 { |
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526 if let Some(next_component) = components.next() { |
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527 component = next_component; |
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528 children = &mut child.children; |
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529 } else { |
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530 return Ok(Some(child)); |
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531 } |
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532 } else { |
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533 return Ok(None); |
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534 } |
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535 } |
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536 } |
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537 |
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538 pub(super) fn get_or_insert<'tree, 'path>( |
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539 &'tree mut self, |
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540 path: &HgPath, |
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541 ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> { |
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542 Self::get_or_insert_node( |
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543 self.on_disk, |
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544 &mut self.unreachable_bytes, |
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545 &mut self.root, |
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546 path, |
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547 WithBasename::to_cow_owned, |
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548 |_| {}, |
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549 ) |
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550 } |
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551 |
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552 fn get_or_insert_node<'tree, 'path>( |
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553 on_disk: &'on_disk [u8], |
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554 unreachable_bytes: &mut u32, |
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555 root: &'tree mut ChildNodes<'on_disk>, |
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556 path: &'path HgPath, |
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557 to_cow: impl Fn( |
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558 WithBasename<&'path HgPath>, |
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559 ) -> WithBasename<Cow<'on_disk, HgPath>>, |
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560 mut each_ancestor: impl FnMut(&mut Node), |
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561 ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> { |
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562 let mut child_nodes = root; |
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563 let mut inclusive_ancestor_paths = |
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564 WithBasename::inclusive_ancestors_of(path); |
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565 let mut ancestor_path = inclusive_ancestor_paths |
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566 .next() |
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567 .expect("expected at least one inclusive ancestor"); |
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568 loop { |
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569 // TODO: can we avoid allocating an owned key in cases where the |
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570 // map already contains that key, without introducing double |
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571 // lookup? |
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572 let child_node = child_nodes |
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573 .make_mut(on_disk, unreachable_bytes)? |
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574 .entry(to_cow(ancestor_path)) |
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575 .or_default(); |
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576 if let Some(next) = inclusive_ancestor_paths.next() { |
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577 each_ancestor(child_node); |
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578 ancestor_path = next; |
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579 child_nodes = &mut child_node.children; |
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580 } else { |
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581 return Ok(child_node); |
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582 } |
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583 } |
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584 } |
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585 |
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586 fn add_or_remove_file( |
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587 &mut self, |
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588 path: &HgPath, |
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589 old_state: Option<EntryState>, |
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590 new_entry: DirstateEntry, |
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591 ) -> Result<(), DirstateV2ParseError> { |
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592 let had_entry = old_state.is_some(); |
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593 let was_tracked = old_state.map_or(false, |s| s.is_tracked()); |
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594 let tracked_count_increment = |
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595 match (was_tracked, new_entry.state().is_tracked()) { |
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596 (false, true) => 1, |
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597 (true, false) => -1, |
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598 _ => 0, |
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599 }; |
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600 |
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601 let node = Self::get_or_insert_node( |
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602 self.on_disk, |
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603 &mut self.unreachable_bytes, |
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604 &mut self.root, |
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605 path, |
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606 WithBasename::to_cow_owned, |
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607 |ancestor| { |
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608 if !had_entry { |
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609 ancestor.descendants_with_entry_count += 1; |
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610 } |
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611 |
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612 // We can’t use `+= increment` because the counter is unsigned, |
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613 // and we want debug builds to detect accidental underflow |
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614 // through zero |
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615 match tracked_count_increment { |
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616 1 => ancestor.tracked_descendants_count += 1, |
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617 -1 => ancestor.tracked_descendants_count -= 1, |
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618 _ => {} |
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619 } |
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620 }, |
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621 )?; |
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622 if !had_entry { |
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623 self.nodes_with_entry_count += 1 |
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624 } |
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625 node.data = NodeData::Entry(new_entry); |
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626 Ok(()) |
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627 } |
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628 |
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629 fn iter_nodes<'tree>( |
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630 &'tree self, |
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631 ) -> impl Iterator< |
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632 Item = Result<NodeRef<'tree, 'on_disk>, DirstateV2ParseError>, |
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633 > + 'tree { |
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634 // Depth first tree traversal. |
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635 // |
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636 // If we could afford internal iteration and recursion, |
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637 // this would look like: |
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638 // |
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639 // ``` |
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640 // fn traverse_children( |
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641 // children: &ChildNodes, |
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642 // each: &mut impl FnMut(&Node), |
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643 // ) { |
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644 // for child in children.values() { |
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645 // traverse_children(&child.children, each); |
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646 // each(child); |
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647 // } |
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648 // } |
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649 // ``` |
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650 // |
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651 // However we want an external iterator and therefore can’t use the |
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652 // call stack. Use an explicit stack instead: |
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653 let mut stack = Vec::new(); |
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654 let mut iter = self.root.as_ref().iter(); |
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655 std::iter::from_fn(move || { |
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656 while let Some(child_node) = iter.next() { |
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657 let children = match child_node.children(self.on_disk) { |
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658 Ok(children) => children, |
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659 Err(error) => return Some(Err(error)), |
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660 }; |
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661 // Pseudo-recursion |
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662 let new_iter = children.iter(); |
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663 let old_iter = std::mem::replace(&mut iter, new_iter); |
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664 stack.push((child_node, old_iter)); |
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665 } |
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666 // Found the end of a `children.iter()` iterator. |
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667 if let Some((child_node, next_iter)) = stack.pop() { |
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668 // "Return" from pseudo-recursion by restoring state from the |
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669 // explicit stack |
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670 iter = next_iter; |
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671 |
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672 Some(Ok(child_node)) |
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673 } else { |
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674 // Reached the bottom of the stack, we’re done |
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675 None |
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676 } |
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677 }) |
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678 } |
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679 |
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680 fn count_dropped_path(unreachable_bytes: &mut u32, path: &Cow<HgPath>) { |
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681 if let Cow::Borrowed(path) = path { |
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682 *unreachable_bytes += path.len() as u32 |
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683 } |
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684 } |
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685 } |
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686 |
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687 /// Like `Iterator::filter_map`, but over a fallible iterator of `Result`s. |
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688 /// |
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689 /// The callback is only called for incoming `Ok` values. Errors are passed |
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690 /// through as-is. In order to let it use the `?` operator the callback is |
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691 /// expected to return a `Result` of `Option`, instead of an `Option` of |
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692 /// `Result`. |
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693 fn filter_map_results<'a, I, F, A, B, E>( |
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694 iter: I, |
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695 f: F, |
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696 ) -> impl Iterator<Item = Result<B, E>> + 'a |
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697 where |
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698 I: Iterator<Item = Result<A, E>> + 'a, |
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699 F: Fn(A) -> Result<Option<B>, E> + 'a, |
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700 { |
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701 iter.filter_map(move |result| match result { |
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702 Ok(node) => f(node).transpose(), |
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703 Err(e) => Some(Err(e)), |
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704 }) |
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705 } |
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706 |
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707 impl OwningDirstateMap { |
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708 pub fn clear(&mut self) { |
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709 let map = self.get_map_mut(); |
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710 map.root = Default::default(); |
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711 map.nodes_with_entry_count = 0; |
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712 map.nodes_with_copy_source_count = 0; |
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713 } |
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714 |
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715 pub fn set_entry( |
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716 &mut self, |
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717 filename: &HgPath, |
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718 entry: DirstateEntry, |
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719 ) -> Result<(), DirstateV2ParseError> { |
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720 let map = self.get_map_mut(); |
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721 map.get_or_insert(&filename)?.data = NodeData::Entry(entry); |
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722 Ok(()) |
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723 } |
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724 |
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725 pub fn add_file( |
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726 &mut self, |
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727 filename: &HgPath, |
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728 entry: DirstateEntry, |
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729 ) -> Result<(), DirstateError> { |
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730 let old_state = self.get(filename)?.map(|e| e.state()); |
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731 let map = self.get_map_mut(); |
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732 Ok(map.add_or_remove_file(filename, old_state, entry)?) |
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733 } |
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734 |
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735 pub fn remove_file( |
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736 &mut self, |
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737 filename: &HgPath, |
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738 in_merge: bool, |
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739 ) -> Result<(), DirstateError> { |
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740 let old_entry_opt = self.get(filename)?; |
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741 let old_state = old_entry_opt.map(|e| e.state()); |
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742 let mut size = 0; |
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743 if in_merge { |
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744 // XXX we should not be able to have 'm' state and 'FROM_P2' if not |
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745 // during a merge. So I (marmoute) am not sure we need the |
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746 // conditionnal at all. Adding double checking this with assert |
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747 // would be nice. |
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748 if let Some(old_entry) = old_entry_opt { |
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749 // backup the previous state |
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750 if old_entry.state() == EntryState::Merged { |
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751 size = SIZE_NON_NORMAL; |
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752 } else if old_entry.state() == EntryState::Normal |
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753 && old_entry.size() == SIZE_FROM_OTHER_PARENT |
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754 { |
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755 // other parent |
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756 size = SIZE_FROM_OTHER_PARENT; |
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757 } |
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758 } |
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759 } |
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760 if size == 0 { |
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761 self.copy_map_remove(filename)?; |
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762 } |
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763 let map = self.get_map_mut(); |
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764 let entry = DirstateEntry::new_removed(size); |
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765 Ok(map.add_or_remove_file(filename, old_state, entry)?) |
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766 } |
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767 |
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768 pub fn drop_entry_and_copy_source( |
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769 &mut self, |
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770 filename: &HgPath, |
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771 ) -> Result<(), DirstateError> { |
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772 let was_tracked = self |
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773 .get(filename)? |
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774 .map_or(false, |e| e.state().is_tracked()); |
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775 let map = self.get_map_mut(); |
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776 struct Dropped { |
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777 was_tracked: bool, |
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778 had_entry: bool, |
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779 had_copy_source: bool, |
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780 } |
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781 |
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782 /// If this returns `Ok(Some((dropped, removed)))`, then |
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783 /// |
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784 /// * `dropped` is about the leaf node that was at `filename` |
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785 /// * `removed` is whether this particular level of recursion just |
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786 /// removed a node in `nodes`. |
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787 fn recur<'on_disk>( |
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788 on_disk: &'on_disk [u8], |
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789 unreachable_bytes: &mut u32, |
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790 nodes: &mut ChildNodes<'on_disk>, |
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791 path: &HgPath, |
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792 ) -> Result<Option<(Dropped, bool)>, DirstateV2ParseError> { |
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793 let (first_path_component, rest_of_path) = |
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794 path.split_first_component(); |
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795 let nodes = nodes.make_mut(on_disk, unreachable_bytes)?; |
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796 let node = if let Some(node) = nodes.get_mut(first_path_component) |
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797 { |
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798 node |
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799 } else { |
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800 return Ok(None); |
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801 }; |
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802 let dropped; |
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|
803 if let Some(rest) = rest_of_path { |
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|
804 if let Some((d, removed)) = recur( |
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|
805 on_disk, |
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|
806 unreachable_bytes, |
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|
807 &mut node.children, |
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|
808 rest, |
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|
809 )? { |
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|
810 dropped = d; |
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|
811 if dropped.had_entry { |
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812 node.descendants_with_entry_count -= 1; |
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|
813 } |
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|
814 if dropped.was_tracked { |
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|
815 node.tracked_descendants_count -= 1; |
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|
816 } |
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817 |
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|
818 // Directory caches must be invalidated when removing a |
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|
819 // child node |
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820 if removed { |
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821 if let NodeData::CachedDirectory { .. } = &node.data { |
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|
822 node.data = NodeData::None |
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823 } |
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824 } |
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825 } else { |
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826 return Ok(None); |
47120
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dirstate-tree: Fold "tracked descendants" counter update in main walk
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827 } |
47192
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828 } else { |
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829 let had_entry = node.data.has_entry(); |
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830 if had_entry { |
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831 node.data = NodeData::None |
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832 } |
47681
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833 if let Some(source) = &node.copy_source { |
48050
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834 DirstateMap::count_dropped_path(unreachable_bytes, source); |
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835 node.copy_source = None |
47681
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836 } |
47192
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dirstate-tree: Refactor DirstateMap::drop_file to be recursive
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837 dropped = Dropped { |
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|
838 was_tracked: node |
47348
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|
839 .data |
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840 .as_entry() |
48022
f2a9db29cb2d
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|
841 .map_or(false, |entry| entry.state().is_tracked()), |
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842 had_entry, |
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843 had_copy_source: node.copy_source.take().is_some(), |
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844 }; |
47193
47ccab19bf9f
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845 } |
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846 // After recursion, for both leaf (rest_of_path is None) nodes and |
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847 // parent nodes, remove a node if it just became empty. |
47352
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|
848 let remove = !node.data.has_entry() |
47193
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|
849 && node.copy_source.is_none() |
47352
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|
850 && node.children.is_empty(); |
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|
851 if remove { |
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852 let (key, _) = |
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853 nodes.remove_entry(first_path_component).unwrap(); |
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854 DirstateMap::count_dropped_path( |
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855 unreachable_bytes, |
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|
856 key.full_path(), |
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|
857 ) |
47192
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|
858 } |
47352
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|
859 Ok(Some((dropped, remove))) |
47192
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|
860 } |
47107
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|
861 |
47681
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862 if let Some((dropped, _removed)) = recur( |
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|
863 map.on_disk, |
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864 &mut map.unreachable_bytes, |
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865 &mut map.root, |
47681
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|
866 filename, |
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|
867 )? { |
47192
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|
868 if dropped.had_entry { |
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|
869 map.nodes_with_entry_count -= 1 |
47107
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|
870 } |
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|
871 if dropped.had_copy_source { |
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|
872 map.nodes_with_copy_source_count -= 1 |
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|
873 } |
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|
874 } else { |
48026
1b2ee68e85f9
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|
875 debug_assert!(!was_tracked); |
47107
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|
876 } |
48048
76f1c76186a1
dirstate: Remove return boolean from dirstatemap.dropfile
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|
877 Ok(()) |
47095
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|
878 } |
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diff
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|
879 |
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|
880 pub fn has_tracked_dir( |
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|
881 &mut self, |
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|
882 directory: &HgPath, |
47335
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|
883 ) -> Result<bool, DirstateError> { |
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|
884 let map = self.get_map_mut(); |
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|
885 if let Some(node) = map.get_node(directory)? { |
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|
886 // A node without a `DirstateEntry` was created to hold child |
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|
887 // nodes, and is therefore a directory. |
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|
888 let state = node.state()?; |
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|
889 Ok(state.is_none() && node.tracked_descendants_count() > 0) |
47106
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|
890 } else { |
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|
891 Ok(false) |
52906934b775
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|
892 } |
47095
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|
893 } |
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diff
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|
894 |
48069
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changeset
|
895 pub fn has_dir( |
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|
896 &mut self, |
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changeset
|
897 directory: &HgPath, |
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|
898 ) -> Result<bool, DirstateError> { |
3d0a9c6e614d
dirstate: Remove the Rust abstraction DirstateMapMethods
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|
899 let map = self.get_map_mut(); |
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|
900 if let Some(node) = map.get_node(directory)? { |
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|
901 // A node without a `DirstateEntry` was created to hold child |
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|
902 // nodes, and is therefore a directory. |
47478
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changeset
|
903 let state = node.state()?; |
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|
904 Ok(state.is_none() && node.descendants_with_entry_count() > 0) |
47106
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|
905 } else { |
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|
906 Ok(false) |
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|
907 } |
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|
908 } |
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|
909 |
47280
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|
910 #[timed] |
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|
911 pub fn pack_v1( |
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912 &mut self, |
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|
913 parents: DirstateParents, |
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|
914 ) -> Result<Vec<u8>, DirstateError> { |
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|
915 let map = self.get_map_mut(); |
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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 map.iter_nodes() { |
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|
920 let node = node?; |
48392
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|
921 if node.entry()?.is_some() { |
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|
922 size += packed_entry_size( |
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|
923 node.full_path(map.on_disk)?, |
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924 node.copy_source(map.on_disk)?, |
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|
925 ); |
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|
926 } |
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|
927 } |
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|
928 |
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|
929 let mut packed = Vec::with_capacity(size); |
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930 packed.extend(parents.as_bytes()); |
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|
931 |
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|
932 for node in map.iter_nodes() { |
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933 let node = node?; |
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|
934 if let Some(entry) = node.entry()? { |
47102
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|
935 pack_entry( |
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|
936 node.full_path(map.on_disk)?, |
47333
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|
937 &entry, |
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938 node.copy_source(map.on_disk)?, |
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|
939 &mut packed, |
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|
940 ); |
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|
941 } |
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|
942 } |
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|
943 Ok(packed) |
47095
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944 } |
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945 |
47682
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|
946 /// Returns new data and metadata together with whether that data should be |
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|
947 /// appended to the existing data file whose content is at |
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948 /// `map.on_disk` (true), instead of written to a new data file |
47682
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|
949 /// (false). |
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950 #[timed] |
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951 pub fn pack_v2( |
47678
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952 &mut self, |
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953 can_append: bool, |
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954 ) -> Result<(Vec<u8>, Vec<u8>, bool), DirstateError> { |
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955 let map = self.get_map_mut(); |
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956 on_disk::write(map, can_append) |
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|
957 } |
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|
958 |
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|
959 pub fn status<'a>( |
47112
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|
960 &'a mut self, |
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|
961 matcher: &'a (dyn Matcher + Sync), |
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|
962 root_dir: PathBuf, |
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|
963 ignore_files: Vec<PathBuf>, |
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|
964 options: StatusOptions, |
47110
9c6b458a08e1
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47109
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|
965 ) -> Result<(DirstateStatus<'a>, Vec<PatternFileWarning>), StatusError> |
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|
966 { |
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967 let map = self.get_map_mut(); |
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|
968 super::status::status(map, matcher, root_dir, ignore_files, options) |
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|
969 } |
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|
970 |
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|
971 pub fn copy_map_len(&self) -> usize { |
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972 let map = self.get_map(); |
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|
973 map.nodes_with_copy_source_count as usize |
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|
974 } |
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|
975 |
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|
976 pub fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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977 let map = self.get_map(); |
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978 Box::new(filter_map_results(map.iter_nodes(), move |node| { |
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979 Ok(if let Some(source) = node.copy_source(map.on_disk)? { |
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980 Some((node.full_path(map.on_disk)?, source)) |
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981 } else { |
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|
982 None |
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983 }) |
47100
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|
984 })) |
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985 } |
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|
986 |
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987 pub fn copy_map_contains_key( |
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988 &self, |
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989 key: &HgPath, |
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990 ) -> Result<bool, DirstateV2ParseError> { |
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991 let map = self.get_map(); |
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992 Ok(if let Some(node) = map.get_node(key)? { |
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|
993 node.has_copy_source() |
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994 } else { |
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|
995 false |
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996 }) |
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997 } |
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|
998 |
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|
999 pub fn copy_map_get( |
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1000 &self, |
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1001 key: &HgPath, |
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|
1002 ) -> Result<Option<&HgPath>, DirstateV2ParseError> { |
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|
1003 let map = self.get_map(); |
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1004 if let Some(node) = map.get_node(key)? { |
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1005 if let Some(source) = node.copy_source(map.on_disk)? { |
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|
1006 return Ok(Some(source)); |
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1007 } |
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1008 } |
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1009 Ok(None) |
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1010 } |
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1011 |
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1012 pub fn copy_map_remove( |
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1013 &mut self, |
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1014 key: &HgPath, |
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1015 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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1016 let map = self.get_map_mut(); |
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1017 let count = &mut map.nodes_with_copy_source_count; |
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1018 let unreachable_bytes = &mut map.unreachable_bytes; |
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1019 Ok(DirstateMap::get_node_mut( |
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1020 map.on_disk, |
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1021 unreachable_bytes, |
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1022 &mut map.root, |
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1023 key, |
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1024 )? |
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1025 .and_then(|node| { |
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1026 if let Some(source) = &node.copy_source { |
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1027 *count -= 1; |
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1028 DirstateMap::count_dropped_path(unreachable_bytes, source); |
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1029 } |
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1030 node.copy_source.take().map(Cow::into_owned) |
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1031 })) |
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1032 } |
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1033 |
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1034 pub fn copy_map_insert( |
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1035 &mut self, |
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1036 key: HgPathBuf, |
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1037 value: HgPathBuf, |
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1038 ) -> Result<Option<HgPathBuf>, DirstateV2ParseError> { |
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1039 let map = self.get_map_mut(); |
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1040 let node = DirstateMap::get_or_insert_node( |
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1041 map.on_disk, |
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1042 &mut map.unreachable_bytes, |
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1043 &mut map.root, |
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1044 &key, |
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1045 WithBasename::to_cow_owned, |
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1046 |_ancestor| {}, |
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1047 )?; |
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1048 if node.copy_source.is_none() { |
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1049 map.nodes_with_copy_source_count += 1 |
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1050 } |
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1051 Ok(node.copy_source.replace(value.into()).map(Cow::into_owned)) |
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1052 } |
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1053 |
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1054 pub fn len(&self) -> usize { |
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1055 let map = self.get_map(); |
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1056 map.nodes_with_entry_count as usize |
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1057 } |
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1058 |
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1059 pub fn contains_key( |
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1060 &self, |
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1061 key: &HgPath, |
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1062 ) -> Result<bool, DirstateV2ParseError> { |
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1063 Ok(self.get(key)?.is_some()) |
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1064 } |
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1065 |
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1066 pub fn get( |
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1067 &self, |
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1068 key: &HgPath, |
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1069 ) -> Result<Option<DirstateEntry>, DirstateV2ParseError> { |
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1070 let map = self.get_map(); |
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1071 Ok(if let Some(node) = map.get_node(key)? { |
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1072 node.entry()? |
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1073 } else { |
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1074 None |
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1075 }) |
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1076 } |
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1077 |
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1078 pub fn iter(&self) -> StateMapIter<'_> { |
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1079 let map = self.get_map(); |
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1080 Box::new(filter_map_results(map.iter_nodes(), move |node| { |
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1081 Ok(if let Some(entry) = node.entry()? { |
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1082 Some((node.full_path(map.on_disk)?, entry)) |
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1083 } else { |
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1084 None |
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1085 }) |
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1086 })) |
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1087 } |
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1088 |
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1089 pub fn iter_tracked_dirs( |
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1090 &mut self, |
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1091 ) -> Result< |
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1092 Box< |
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1093 dyn Iterator<Item = Result<&HgPath, DirstateV2ParseError>> |
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1094 + Send |
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1095 + '_, |
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1096 >, |
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1097 DirstateError, |
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1098 > { |
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1099 let map = self.get_map_mut(); |
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1100 let on_disk = map.on_disk; |
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1101 Ok(Box::new(filter_map_results( |
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1102 map.iter_nodes(), |
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1103 move |node| { |
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1104 Ok(if node.tracked_descendants_count() > 0 { |
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1105 Some(node.full_path(on_disk)?) |
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1106 } else { |
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1107 None |
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1108 }) |
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1109 }, |
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1110 ))) |
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1111 } |
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1112 |
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1113 pub fn debug_iter( |
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dirstate-v2: Add --dirs to debugdirstate command
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1114 &self, |
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1115 all: bool, |
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1116 ) -> Box< |
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dirstate-v2: Add --dirs to debugdirstate command
Simon Sapin <simon.sapin@octobus.net>
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1117 dyn Iterator< |
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Simon Sapin <simon.sapin@octobus.net>
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1118 Item = Result< |
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dirstate-v2: Separate iterators for dirfoldmap and debugdirstate
Simon Sapin <simon.sapin@octobus.net>
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1119 (&HgPath, (u8, i32, i32, i32)), |
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Simon Sapin <simon.sapin@octobus.net>
parents:
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1120 DirstateV2ParseError, |
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Simon Sapin <simon.sapin@octobus.net>
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1121 >, |
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1122 > + Send |
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Simon Sapin <simon.sapin@octobus.net>
parents:
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1123 + '_, |
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Simon Sapin <simon.sapin@octobus.net>
parents:
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1124 > { |
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dirstate: Remove the Rust abstraction DirstateMapMethods
Simon Sapin <simon.sapin@octobus.net>
parents:
48068
diff
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1125 let map = self.get_map(); |
3d0a9c6e614d
dirstate: Remove the Rust abstraction DirstateMapMethods
Simon Sapin <simon.sapin@octobus.net>
parents:
48068
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1126 Box::new(filter_map_results(map.iter_nodes(), move |node| { |
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dirstate-v2: Separate iterators for dirfoldmap and debugdirstate
Simon Sapin <simon.sapin@octobus.net>
parents:
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1127 let debug_tuple = if let Some(entry) = node.entry()? { |
284a20269a97
dirstate-v2: Separate iterators for dirfoldmap and debugdirstate
Simon Sapin <simon.sapin@octobus.net>
parents:
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1128 entry.debug_tuple() |
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debugstate: Always call dirstatemap.debug_iter()
Simon Sapin <simon.sapin@octobus.net>
parents:
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1129 } else if !all { |
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Simon Sapin <simon.sapin@octobus.net>
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1130 return Ok(None); |
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dirstate-v2: Truncate directory mtimes to 31 bits of seconds
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1131 } else if let Some(mtime) = node.cached_directory_mtime()? { |
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1132 (b' ', 0, -1, mtime.truncated_seconds() as i32) |
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1133 } else { |
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Simon Sapin <simon.sapin@octobus.net>
parents:
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1134 (b' ', 0, -1, -1) |
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1135 }; |
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dirstate: Remove the Rust abstraction DirstateMapMethods
Simon Sapin <simon.sapin@octobus.net>
parents:
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1136 Ok(Some((node.full_path(map.on_disk)?, debug_tuple))) |
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1137 })) |
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1138 } |
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1139 } |