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commit-graph: avoid malloc'ing a local variable

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We do need a context to write the commit graph, but that context is only
needed during the life time of `commit_graph_write()`, therefore it can
easily be a stack variable.

This also helps CodeQL recognize that it is safe to assign the address
of other local variables to the context's fields.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin
2025-05-15 13:11:41 +00:00
committed by Junio C Hamano
parent c607410ada
commit 7f3ed75ff5
1 changed files with 69 additions and 72 deletions
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141
commit-graph.c
View File

@@ -2509,7 +2509,17 @@ int write_commit_graph(struct object_directory *odb,
const struct commit_graph_opts *opts)
{
struct repository *r = the_repository;
struct write_commit_graph_context *ctx;
struct write_commit_graph_context ctx = {
.r = r,
.odb = odb,
.append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0,
.report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0,
.split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0,
.opts = opts,
.total_bloom_filter_data_size = 0,
.write_generation_data = (get_configured_generation_version(r) == 2),
.num_generation_data_overflows = 0,
};
uint32_t i;
int res = 0;
int replace = 0;
@@ -2531,17 +2541,6 @@ int write_commit_graph(struct object_directory *odb,
return 0;
}
CALLOC_ARRAY(ctx, 1);
ctx->r = r;
ctx->odb = odb;
ctx->append = flags & COMMIT_GRAPH_WRITE_APPEND ? 1 : 0;
ctx->report_progress = flags & COMMIT_GRAPH_WRITE_PROGRESS ? 1 : 0;
ctx->split = flags & COMMIT_GRAPH_WRITE_SPLIT ? 1 : 0;
ctx->opts = opts;
ctx->total_bloom_filter_data_size = 0;
ctx->write_generation_data = (get_configured_generation_version(r) == 2);
ctx->num_generation_data_overflows = 0;
bloom_settings.hash_version = r->settings.commit_graph_changed_paths_version;
bloom_settings.bits_per_entry = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_BITS_PER_ENTRY",
bloom_settings.bits_per_entry);
@@ -2549,14 +2548,14 @@ int write_commit_graph(struct object_directory *odb,
bloom_settings.num_hashes);
bloom_settings.max_changed_paths = git_env_ulong("GIT_TEST_BLOOM_SETTINGS_MAX_CHANGED_PATHS",
bloom_settings.max_changed_paths);
ctx->bloom_settings = &bloom_settings;
ctx.bloom_settings = &bloom_settings;
init_topo_level_slab(&topo_levels);
ctx->topo_levels = &topo_levels;
ctx.topo_levels = &topo_levels;
prepare_commit_graph(ctx->r);
if (ctx->r->objects->commit_graph) {
struct commit_graph *g = ctx->r->objects->commit_graph;
prepare_commit_graph(ctx.r);
if (ctx.r->objects->commit_graph) {
struct commit_graph *g = ctx.r->objects->commit_graph;
while (g) {
g->topo_levels = &topo_levels;
@@ -2565,15 +2564,15 @@ int write_commit_graph(struct object_directory *odb,
}
if (flags & COMMIT_GRAPH_WRITE_BLOOM_FILTERS)
ctx->changed_paths = 1;
ctx.changed_paths = 1;
if (!(flags & COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS)) {
struct commit_graph *g;
g = ctx->r->objects->commit_graph;
g = ctx.r->objects->commit_graph;
/* We have changed-paths already. Keep them in the next graph */
if (g && g->bloom_filter_settings) {
ctx->changed_paths = 1;
ctx.changed_paths = 1;
/* don't propagate the hash_version unless unspecified */
if (bloom_settings.hash_version == -1)
@@ -2586,116 +2585,114 @@ int write_commit_graph(struct object_directory *odb,
bloom_settings.hash_version = bloom_settings.hash_version == 2 ? 2 : 1;
if (ctx->split) {
struct commit_graph *g = ctx->r->objects->commit_graph;
if (ctx.split) {
struct commit_graph *g = ctx.r->objects->commit_graph;
while (g) {
ctx->num_commit_graphs_before++;
ctx.num_commit_graphs_before++;
g = g->base_graph;
}
if (ctx->num_commit_graphs_before) {
ALLOC_ARRAY(ctx->commit_graph_filenames_before, ctx->num_commit_graphs_before);
i = ctx->num_commit_graphs_before;
g = ctx->r->objects->commit_graph;
if (ctx.num_commit_graphs_before) {
ALLOC_ARRAY(ctx.commit_graph_filenames_before, ctx.num_commit_graphs_before);
i = ctx.num_commit_graphs_before;
g = ctx.r->objects->commit_graph;
while (g) {
ctx->commit_graph_filenames_before[--i] = xstrdup(g->filename);
ctx.commit_graph_filenames_before[--i] = xstrdup(g->filename);
g = g->base_graph;
}
}
if (ctx->opts)
replace = ctx->opts->split_flags & COMMIT_GRAPH_SPLIT_REPLACE;
if (ctx.opts)
replace = ctx.opts->split_flags & COMMIT_GRAPH_SPLIT_REPLACE;
}
ctx->approx_nr_objects = repo_approximate_object_count(the_repository);
ctx.approx_nr_objects = repo_approximate_object_count(the_repository);
if (ctx->append && ctx->r->objects->commit_graph) {
struct commit_graph *g = ctx->r->objects->commit_graph;
if (ctx.append && ctx.r->objects->commit_graph) {
struct commit_graph *g = ctx.r->objects->commit_graph;
for (i = 0; i < g->num_commits; i++) {
struct object_id oid;
oidread(&oid, g->chunk_oid_lookup + st_mult(g->hash_len, i),
the_repository->hash_algo);
oid_array_append(&ctx->oids, &oid);
oid_array_append(&ctx.oids, &oid);
}
}
if (pack_indexes) {
ctx->order_by_pack = 1;
if ((res = fill_oids_from_packs(ctx, pack_indexes)))
ctx.order_by_pack = 1;
if ((res = fill_oids_from_packs(&ctx, pack_indexes)))
goto cleanup;
}
if (commits) {
if ((res = fill_oids_from_commits(ctx, commits)))
if ((res = fill_oids_from_commits(&ctx, commits)))
goto cleanup;
}
if (!pack_indexes && !commits) {
ctx->order_by_pack = 1;
fill_oids_from_all_packs(ctx);
ctx.order_by_pack = 1;
fill_oids_from_all_packs(&ctx);
}
close_reachable(ctx);
close_reachable(&ctx);
copy_oids_to_commits(ctx);
copy_oids_to_commits(&ctx);
if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) {
if (ctx.commits.nr >= GRAPH_EDGE_LAST_MASK) {
error(_("too many commits to write graph"));
res = -1;
goto cleanup;
}
if (!ctx->commits.nr && !replace)
if (!ctx.commits.nr && !replace)
goto cleanup;
if (ctx->split) {
split_graph_merge_strategy(ctx);
if (ctx.split) {
split_graph_merge_strategy(&ctx);
if (!replace)
merge_commit_graphs(ctx);
merge_commit_graphs(&ctx);
} else
ctx->num_commit_graphs_after = 1;
ctx.num_commit_graphs_after = 1;
ctx->trust_generation_numbers = validate_mixed_generation_chain(ctx->r->objects->commit_graph);
ctx.trust_generation_numbers = validate_mixed_generation_chain(ctx.r->objects->commit_graph);
compute_topological_levels(ctx);
if (ctx->write_generation_data)
compute_generation_numbers(ctx);
compute_topological_levels(&ctx);
if (ctx.write_generation_data)
compute_generation_numbers(&ctx);
if (ctx->changed_paths)
compute_bloom_filters(ctx);
if (ctx.changed_paths)
compute_bloom_filters(&ctx);
res = write_commit_graph_file(ctx);
res = write_commit_graph_file(&ctx);
if (ctx->changed_paths)
if (ctx.changed_paths)
deinit_bloom_filters();
if (ctx->split)
mark_commit_graphs(ctx);
if (ctx.split)
mark_commit_graphs(&ctx);
expire_commit_graphs(ctx);
expire_commit_graphs(&ctx);
cleanup:
free(ctx->graph_name);
free(ctx->base_graph_name);
free(ctx->commits.list);
oid_array_clear(&ctx->oids);
free(ctx.graph_name);
free(ctx.base_graph_name);
free(ctx.commits.list);
oid_array_clear(&ctx.oids);
clear_topo_level_slab(&topo_levels);
for (i = 0; i < ctx->num_commit_graphs_before; i++)
free(ctx->commit_graph_filenames_before[i]);
free(ctx->commit_graph_filenames_before);
for (i = 0; i < ctx.num_commit_graphs_before; i++)
free(ctx.commit_graph_filenames_before[i]);
free(ctx.commit_graph_filenames_before);
for (i = 0; i < ctx->num_commit_graphs_after; i++) {
free(ctx->commit_graph_filenames_after[i]);
free(ctx->commit_graph_hash_after[i]);
for (i = 0; i < ctx.num_commit_graphs_after; i++) {
free(ctx.commit_graph_filenames_after[i]);
free(ctx.commit_graph_hash_after[i]);
}
free(ctx->commit_graph_filenames_after);
free(ctx->commit_graph_hash_after);
free(ctx);
free(ctx.commit_graph_filenames_after);
free(ctx.commit_graph_hash_after);
return res;
}