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index: make IndexRef::entry_by_id() etc return entry with repo's lifetime

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It's useful to be able to know that given a `repo: RepoRef<'a>`, the
the lifetime of `repo.index().entry_by_id()` will also be `'a`.
This commit is contained in:
Martin von Zweigbergk 2021-04-12 22:47:21 -07:00
parent 209c62075e
commit 7861968f64
3 changed files with 55 additions and 39 deletions
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30
lib/src/index.rs
View file

@ -33,12 +33,12 @@ use crate::store::{ChangeId, CommitId};
#[derive(Clone)]
pub enum IndexRef<'a> {
Readonly(Arc<ReadonlyIndex>),
Readonly(&'a ReadonlyIndex),
Mutable(&'a MutableIndex),
}
impl From<Arc<ReadonlyIndex>> for IndexRef<'_> {
fn from(index: Arc<ReadonlyIndex>) -> Self {
impl<'a> From<&'a ReadonlyIndex> for IndexRef<'a> {
fn from(index: &'a ReadonlyIndex) -> Self {
IndexRef::Readonly(index)
}
}
@ -78,14 +78,14 @@ impl<'a> IndexRef<'a> {
}
}
pub fn entry_by_id(&self, commit_id: &CommitId) -> Option<IndexEntry> {
pub fn entry_by_id(&self, commit_id: &CommitId) -> Option<IndexEntry<'a>> {
match self {
IndexRef::Readonly(index) => index.entry_by_id(commit_id),
IndexRef::Mutable(index) => index.entry_by_id(commit_id),
}
}
pub fn entry_by_pos(&self, pos: u32) -> IndexEntry {
pub fn entry_by_pos(&self, pos: u32) -> IndexEntry<'a> {
match self {
IndexRef::Readonly(index) => index.entry_by_pos(pos),
IndexRef::Mutable(index) => index.entry_by_pos(pos),
@ -113,7 +113,7 @@ impl<'a> IndexRef<'a> {
}
}
pub fn walk_revs(&self, wanted: &[CommitId], unwanted: &[CommitId]) -> RevWalk {
pub fn walk_revs(&self, wanted: &[CommitId], unwanted: &[CommitId]) -> RevWalk<'a> {
match self {
IndexRef::Readonly(index) => index.walk_revs(wanted, unwanted),
IndexRef::Mutable(index) => index.walk_revs(wanted, unwanted),
@ -772,7 +772,7 @@ impl<'a> CompositeIndex<'a> {
self.0
.segment_parent_file()
.as_ref()
.and_then(|file| IndexRef::Readonly(file.clone()).commit_id_to_pos(commit_id))
.and_then(|file| IndexRef::Readonly(file).commit_id_to_pos(commit_id))
})
}
@ -1564,8 +1564,10 @@ mod tests {
fn index_empty(on_disk: bool) {
let temp_dir = tempfile::tempdir().unwrap();
let index = MutableIndex::full(3);
let mut _saved_index = None;
let index = if on_disk {
IndexRef::Readonly(index.save_in(temp_dir.path().to_owned()).unwrap())
_saved_index = Some(index.save_in(temp_dir.path().to_owned()).unwrap());
IndexRef::Readonly(_saved_index.as_ref().unwrap())
} else {
IndexRef::Mutable(&index)
};
@ -1593,8 +1595,10 @@ mod tests {
let id_0 = CommitId::from_hex("000000");
let change_id0 = new_change_id();
index.add_commit_data(id_0.clone(), change_id0.clone(), false, vec![], vec![]);
let mut _saved_index = None;
let index = if on_disk {
IndexRef::Readonly(index.save_in(temp_dir.path().to_owned()).unwrap())
_saved_index = Some(index.save_in(temp_dir.path().to_owned()).unwrap());
IndexRef::Readonly(_saved_index.as_ref().unwrap())
} else {
IndexRef::Mutable(&index)
};
@ -1715,8 +1719,10 @@ mod tests {
vec![id_4.clone(), id_2.clone()],
vec![],
);
let mut _saved_index = None;
let index = if on_disk {
IndexRef::Readonly(index.save_in(temp_dir.path().to_owned()).unwrap())
_saved_index = Some(index.save_in(temp_dir.path().to_owned()).unwrap());
IndexRef::Readonly(_saved_index.as_ref().unwrap())
} else {
IndexRef::Mutable(&index)
};
@ -1839,8 +1845,10 @@ mod tests {
vec![id_1, id_2, id_3, id_4, id_5],
vec![],
);
let mut _saved_index = None;
let index = if on_disk {
IndexRef::Readonly(index.save_in(temp_dir.path().to_owned()).unwrap())
_saved_index = Some(index.save_in(temp_dir.path().to_owned()).unwrap());
IndexRef::Readonly(_saved_index.as_ref().unwrap())
} else {
IndexRef::Mutable(&index)
};

15
lib/src/repo.rs
View file

@ -84,7 +84,7 @@ impl<'a> RepoRef<'a> {
}
}
pub fn index(&self) -> IndexRef {
pub fn index(&self) -> IndexRef<'a> {
match self {
RepoRef::Readonly(repo) => IndexRef::Readonly(repo.index()),
RepoRef::Mutable(repo) => IndexRef::Mutable(repo.index()),
@ -298,7 +298,7 @@ impl ReadonlyRepo {
locked_evolution.as_ref().unwrap().clone()
}
pub fn index(&self) -> Arc<ReadonlyIndex> {
pub fn index(&self) -> &Arc<ReadonlyIndex> {
let mut locked_index = self.index.lock().unwrap();
if locked_index.is_none() {
let op_id = self.op_id.clone();
@ -306,10 +306,15 @@ impl ReadonlyRepo {
let op = Operation::new(self.op_store.clone(), op_id, op);
locked_index.replace(self.index_store.get_index_at_op(&op, self.store.as_ref()));
}
locked_index.as_ref().unwrap().clone()
let index: &Arc<ReadonlyIndex> = locked_index.as_ref().unwrap();
// Extend lifetime from that of mutex lock to that of self. Safe since we never
// change value once it's been set (except in `reindex()` but that
// requires a mutable reference).
let index: &Arc<ReadonlyIndex> = unsafe { std::mem::transmute(index) };
index
}
pub fn reindex(&mut self) -> Arc<ReadonlyIndex> {
pub fn reindex(&mut self) -> &Arc<ReadonlyIndex> {
self.index_store.reinit();
{
let mut locked_index = self.index.lock().unwrap();
@ -350,7 +355,7 @@ impl ReadonlyRepo {
let locked_evolution = self.evolution.lock().unwrap();
let mut_repo = MutableRepo::new(
self.clone(),
self.index(),
self.index().clone(),
&self.view,
locked_evolution.as_ref(),
);

49
lib/tests/test_index.rs
View file

@ -50,11 +50,14 @@ fn test_index_commits_empty_repo(use_git: bool) {
// Check the generation numbers of the root and the working copy
assert_eq!(
generation_number(index.clone(), repo.store().root_commit_id()),
generation_number(index.as_ref(), repo.store().root_commit_id()),
0
);
assert_eq!(
generation_number(index, &repo.working_copy_locked().current_commit_id()),
generation_number(
index.as_ref(),
&repo.working_copy_locked().current_commit_id()
),
1
);
}
@ -105,16 +108,16 @@ fn test_index_commits_standard_cases(use_git: bool) {
assert_eq!(stats.num_merges, 1);
assert_eq!(stats.max_generation_number, 6);
assert_eq!(generation_number(index.clone(), root_commit.id()), 0);
assert_eq!(generation_number(index.clone(), wc_commit.id()), 1);
assert_eq!(generation_number(index.clone(), commit_a.id()), 1);
assert_eq!(generation_number(index.clone(), commit_b.id()), 2);
assert_eq!(generation_number(index.clone(), commit_c.id()), 2);
assert_eq!(generation_number(index.clone(), commit_d.id()), 3);
assert_eq!(generation_number(index.clone(), commit_e.id()), 4);
assert_eq!(generation_number(index.clone(), commit_f.id()), 5);
assert_eq!(generation_number(index.clone(), commit_g.id()), 6);
assert_eq!(generation_number(index.clone(), commit_h.id()), 5);
assert_eq!(generation_number(index.as_ref(), root_commit.id()), 0);
assert_eq!(generation_number(index.as_ref(), wc_commit.id()), 1);
assert_eq!(generation_number(index.as_ref(), commit_a.id()), 1);
assert_eq!(generation_number(index.as_ref(), commit_b.id()), 2);
assert_eq!(generation_number(index.as_ref(), commit_c.id()), 2);
assert_eq!(generation_number(index.as_ref(), commit_d.id()), 3);
assert_eq!(generation_number(index.as_ref(), commit_e.id()), 4);
assert_eq!(generation_number(index.as_ref(), commit_f.id()), 5);
assert_eq!(generation_number(index.as_ref(), commit_g.id()), 6);
assert_eq!(generation_number(index.as_ref(), commit_h.id()), 5);
assert!(index.is_ancestor(root_commit.id(), commit_a.id()));
assert!(!index.is_ancestor(commit_a.id(), root_commit.id()));
@ -181,11 +184,11 @@ fn test_index_commits_criss_cross(use_git: bool) {
// Check generation numbers
for gen in 0..num_generations {
assert_eq!(
generation_number(index.clone(), left_commits[gen].id()),
generation_number(index.as_ref(), left_commits[gen].id()),
(gen as u32) + 1
);
assert_eq!(
generation_number(index.clone(), right_commits[gen].id()),
generation_number(index.as_ref(), right_commits[gen].id()),
(gen as u32) + 1
);
}
@ -291,9 +294,9 @@ fn test_index_commits_previous_operations(use_git: bool) {
assert_eq!(stats.num_merges, 0);
assert_eq!(stats.max_generation_number, 3);
assert_eq!(generation_number(index.clone(), commit_a.id()), 1);
assert_eq!(generation_number(index.clone(), commit_b.id()), 2);
assert_eq!(generation_number(index, commit_c.id()), 3);
assert_eq!(generation_number(index.as_ref(), commit_a.id()), 1);
assert_eq!(generation_number(index.as_ref(), commit_b.id()), 2);
assert_eq!(generation_number(index.as_ref(), commit_c.id()), 3);
}
#[test_case(false ; "local store")]
@ -339,10 +342,10 @@ fn test_index_commits_incremental(use_git: bool) {
assert_eq!(stats.levels.len(), 1);
assert_eq!(stats.levels[0].num_commits, 5);
assert_eq!(generation_number(index.clone(), root_commit.id()), 0);
assert_eq!(generation_number(index.clone(), commit_a.id()), 1);
assert_eq!(generation_number(index.clone(), commit_b.id()), 2);
assert_eq!(generation_number(index, commit_c.id()), 3);
assert_eq!(generation_number(index.as_ref(), root_commit.id()), 0);
assert_eq!(generation_number(index.as_ref(), commit_a.id()), 1);
assert_eq!(generation_number(index.as_ref(), commit_b.id()), 2);
assert_eq!(generation_number(index.as_ref(), commit_c.id()), 3);
}
#[test_case(false ; "local store")]
@ -385,8 +388,8 @@ fn test_index_commits_incremental_empty_transaction(use_git: bool) {
assert_eq!(stats.levels[1].num_commits, 1);
assert_ne!(stats.levels[1].name, stats.levels[0].name);
assert_eq!(generation_number(index.clone(), root_commit.id()), 0);
assert_eq!(generation_number(index, commit_a.id()), 1);
assert_eq!(generation_number(index.as_ref(), root_commit.id()), 0);
assert_eq!(generation_number(index.as_ref(), commit_a.id()), 1);
}
#[test_case(false ; "local store")]