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commit-graph: introduce `ensure_generations_valid()` 

Use the just-introduced compute_reachable_generation_numbers_1() to
implement a function which dynamically computes topological levels (or
corrected commit dates) for out-of-graph commits.

This will be useful for the ahead-behind algorithm we are about to
introduce, which needs accurate topological levels on _all_ commits
reachable from the tips in order to avoid over-counting.

Co-authored-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2023-03-20 11:26:52 +00:00 committed by Junio C Hamano
parent 2ee11f7261
commit c08645b353
2 changed files with 37 additions and 0 deletions
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29
commit-graph.c
View File

@ -1604,6 +1604,35 @@ static void compute_generation_numbers(struct write_commit_graph_context *ctx)
stop_progress(&ctx->progress);
}
static void set_generation_in_graph_data(struct commit *c, timestamp_t t,
void *data)
{
commit_graph_data_at(c)->generation = t;
}
/*
* After this method, all commits reachable from those in the given
* list will have non-zero, non-infinite generation numbers.
*/
void ensure_generations_valid(struct repository *r,
struct commit **commits, size_t nr)
{
int generation_version = get_configured_generation_version(r);
struct packed_commit_list list = {
.list = commits,
.alloc = nr,
.nr = nr,
};
struct compute_generation_info info = {
.r = r,
.commits = &list,
.get_generation = get_generation_from_graph_data,
.set_generation = set_generation_in_graph_data,
};
compute_reachable_generation_numbers(&info, generation_version);
}
static void trace2_bloom_filter_write_statistics(struct write_commit_graph_context *ctx)
{
trace2_data_intmax("commit-graph", ctx->r, "filter-computed",

8
commit-graph.h
View File

@ -190,4 +190,12 @@ struct commit_graph_data {
*/
timestamp_t commit_graph_generation(const struct commit *);
uint32_t commit_graph_position(const struct commit *);
/*
* After this method, all commits reachable from those in the given
* list will have non-zero, non-infinite generation numbers.
*/
void ensure_generations_valid(struct repository *r,
struct commit **commits, size_t nr);
#endif