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index: remove unused flag field from readonly index segment

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This is remainder of fdb861b957 "backend: remove unused Commit::is_pruned."
As I'm going to change the index format, let's remove unused fields, too.
This commit is contained in:
Yuya Nishihara 2023-12-20 13:06:39 +09:00
parent 26528091e6
commit 3e43108abb
2 changed files with 8 additions and 12 deletions
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3
lib/src/default_index/mutable.rs
View file

@ -196,9 +196,6 @@ impl MutableIndexSegment {
let mut parent_overflow = vec![];
for entry in &self.graph {
let flags = 0_u32;
buf.extend(flags.to_le_bytes());
buf.extend(entry.generation_number.to_le_bytes());
buf.extend(

17
lib/src/default_index/readonly.rs
View file

@ -73,7 +73,7 @@ impl ReadonlyIndexLoadError {
}
/// Current format version of the index segment file.
pub(crate) const INDEX_SEGMENT_FILE_FORMAT_VERSION: u32 = 1;
pub(crate) const INDEX_SEGMENT_FILE_FORMAT_VERSION: u32 = 2;
struct CommitGraphEntry<'a> {
data: &'a [u8],
@ -85,23 +85,23 @@ struct CommitGraphEntry<'a> {
// lowest set bit to determine which generation number the pointers point to.
impl CommitGraphEntry<'_> {
fn size(commit_id_length: usize, change_id_length: usize) -> usize {
20 + commit_id_length + change_id_length
16 + commit_id_length + change_id_length
}
fn generation_number(&self) -> u32 {
u32::from_le_bytes(self.data[4..8].try_into().unwrap())
u32::from_le_bytes(self.data[0..4].try_into().unwrap())
}
fn num_parents(&self) -> u32 {
u32::from_le_bytes(self.data[8..12].try_into().unwrap())
u32::from_le_bytes(self.data[4..8].try_into().unwrap())
}
fn parent1_pos(&self) -> IndexPosition {
IndexPosition(u32::from_le_bytes(self.data[12..16].try_into().unwrap()))
IndexPosition(u32::from_le_bytes(self.data[8..12].try_into().unwrap()))
}
fn parent2_overflow_pos(&self) -> u32 {
u32::from_le_bytes(self.data[16..20].try_into().unwrap())
u32::from_le_bytes(self.data[12..16].try_into().unwrap())
}
// TODO: Consider storing the change ids in a separate table. That table could
@ -111,11 +111,11 @@ impl CommitGraphEntry<'_> {
// to better cache locality when walking it; ability to quickly find all
// commits associated with a change id.
fn change_id(&self) -> ChangeId {
ChangeId::new(self.data[20..][..self.change_id_length].to_vec())
ChangeId::new(self.data[16..][..self.change_id_length].to_vec())
}
fn commit_id(&self) -> CommitId {
CommitId::from_bytes(&self.data[20 + self.change_id_length..][..self.commit_id_length])
CommitId::from_bytes(&self.data[16 + self.change_id_length..][..self.commit_id_length])
}
}
@ -155,7 +155,6 @@ impl CommitLookupEntry<'_> {
/// u32: number of local entries
/// u32: number of overflow parent entries
/// for each entry, in some topological order with parents first:
/// u32: flags (unused)
/// u32: generation number
/// u32: number of parents
/// u32: global index position for parent 1