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authorJunio C Hamano <gitster@pobox.com>2019-12-25 19:21:58 (GMT)
committerJunio C Hamano <gitster@pobox.com>2019-12-25 19:21:58 (GMT)
commitf3c520e17fa8ed479701e75fe190b37e5e362419 (patch)
tree05cdd4e47a3d4801aed29d6a577b18f68b85db2f /builtin/name-rev.c
parent6514ad40a1a3cf80b2c25e3318dbf0252599fb8d (diff)
parent2866fd284c57d729d486ed93a7fc118f78e765cb (diff)
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Merge branch 'sg/name-rev-wo-recursion'
Redo "git name-rev" to avoid recursive calls. * sg/name-rev-wo-recursion: name-rev: cleanup name_ref() name-rev: eliminate recursion in name_rev() name-rev: use 'name->tip_name' instead of 'tip_name' name-rev: drop name_rev()'s 'generation' and 'distance' parameters name-rev: restructure creating/updating 'struct rev_name' instances name-rev: restructure parsing commits and applying date cutoff name-rev: pull out deref handling from the recursion name-rev: extract creating/updating a 'struct name_rev' into a helper t6120: add a test to cover inner conditions in 'git name-rev's name_rev() name-rev: use sizeof(*ptr) instead of sizeof(type) in allocation name-rev: avoid unnecessary cast in name_ref() name-rev: use strbuf_strip_suffix() in get_rev_name() t6120-describe: modernize the 'check_describe' helper t6120-describe: correct test repo history graph in comment
Diffstat (limited to 'builtin/name-rev.c')
-rw-r--r--builtin/name-rev.c147
1 files changed, 97 insertions, 50 deletions
diff --git a/builtin/name-rev.c b/builtin/name-rev.c
index e55a4f0..6b9e8c8 100644
--- a/builtin/name-rev.c
+++ b/builtin/name-rev.c
@@ -6,6 +6,7 @@
#include "tag.h"
#include "refs.h"
#include "parse-options.h"
+#include "prio-queue.h"
#include "sha1-lookup.h"
#include "commit-slab.h"
@@ -79,30 +80,16 @@ static int is_better_name(struct rev_name *name,
return 0;
}
-static void name_rev(struct commit *commit,
- const char *tip_name, timestamp_t taggerdate,
- int generation, int distance, int from_tag,
- int deref)
+static struct rev_name *create_or_update_name(struct commit *commit,
+ const char *tip_name,
+ timestamp_t taggerdate,
+ int generation, int distance,
+ int from_tag)
{
struct rev_name *name = get_commit_rev_name(commit);
- struct commit_list *parents;
- int parent_number = 1;
- char *to_free = NULL;
-
- parse_commit(commit);
-
- if (commit->date < cutoff)
- return;
-
- if (deref) {
- tip_name = to_free = xstrfmt("%s^0", tip_name);
-
- if (generation)
- die("generation: %d, but deref?", generation);
- }
if (name == NULL) {
- name = xmalloc(sizeof(rev_name));
+ name = xmalloc(sizeof(*name));
set_commit_rev_name(commit, name);
goto copy_data;
} else if (is_better_name(name, taggerdate, distance, from_tag)) {
@@ -112,35 +99,97 @@ copy_data:
name->generation = generation;
name->distance = distance;
name->from_tag = from_tag;
- } else {
+
+ return name;
+ } else
+ return NULL;
+}
+
+static void name_rev(struct commit *start_commit,
+ const char *tip_name, timestamp_t taggerdate,
+ int from_tag, int deref)
+{
+ struct prio_queue queue;
+ struct commit *commit;
+ struct commit **parents_to_queue = NULL;
+ size_t parents_to_queue_nr, parents_to_queue_alloc = 0;
+ char *to_free = NULL;
+
+ parse_commit(start_commit);
+ if (start_commit->date < cutoff)
+ return;
+
+ if (deref)
+ tip_name = to_free = xstrfmt("%s^0", tip_name);
+
+ if (!create_or_update_name(start_commit, tip_name, taggerdate, 0, 0,
+ from_tag)) {
free(to_free);
return;
}
- for (parents = commit->parents;
- parents;
- parents = parents->next, parent_number++) {
- if (parent_number > 1) {
- size_t len;
- char *new_name;
-
- strip_suffix(tip_name, "^0", &len);
- if (generation > 0)
- new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
- generation, parent_number);
- else
- new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
- parent_number);
-
- name_rev(parents->item, new_name, taggerdate, 0,
- distance + MERGE_TRAVERSAL_WEIGHT,
- from_tag, 0);
- } else {
- name_rev(parents->item, tip_name, taggerdate,
- generation + 1, distance + 1,
- from_tag, 0);
+ memset(&queue, 0, sizeof(queue)); /* Use the prio_queue as LIFO */
+ prio_queue_put(&queue, start_commit);
+
+ while ((commit = prio_queue_get(&queue))) {
+ struct rev_name *name = get_commit_rev_name(commit);
+ struct commit_list *parents;
+ int parent_number = 1;
+
+ parents_to_queue_nr = 0;
+
+ for (parents = commit->parents;
+ parents;
+ parents = parents->next, parent_number++) {
+ struct commit *parent = parents->item;
+ const char *new_name;
+ int generation, distance;
+
+ parse_commit(parent);
+ if (parent->date < cutoff)
+ continue;
+
+ if (parent_number > 1) {
+ size_t len;
+
+ strip_suffix(name->tip_name, "^0", &len);
+ if (name->generation > 0)
+ new_name = xstrfmt("%.*s~%d^%d",
+ (int)len,
+ name->tip_name,
+ name->generation,
+ parent_number);
+ else
+ new_name = xstrfmt("%.*s^%d", (int)len,
+ name->tip_name,
+ parent_number);
+ generation = 0;
+ distance = name->distance + MERGE_TRAVERSAL_WEIGHT;
+ } else {
+ new_name = name->tip_name;
+ generation = name->generation + 1;
+ distance = name->distance + 1;
+ }
+
+ if (create_or_update_name(parent, new_name, taggerdate,
+ generation, distance,
+ from_tag)) {
+ ALLOC_GROW(parents_to_queue,
+ parents_to_queue_nr + 1,
+ parents_to_queue_alloc);
+ parents_to_queue[parents_to_queue_nr] = parent;
+ parents_to_queue_nr++;
+ }
}
+
+ /* The first parent must come out first from the prio_queue */
+ while (parents_to_queue_nr)
+ prio_queue_put(&queue,
+ parents_to_queue[--parents_to_queue_nr]);
}
+
+ clear_prio_queue(&queue);
+ free(parents_to_queue);
}
static int subpath_matches(const char *path, const char *filter)
@@ -272,10 +321,9 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
int from_tag = starts_with(path, "refs/tags/");
if (taggerdate == TIME_MAX)
- taggerdate = ((struct commit *)o)->date;
+ taggerdate = commit->date;
path = name_ref_abbrev(path, can_abbreviate_output);
- name_rev(commit, xstrdup(path), taggerdate, 0, 0,
- from_tag, deref);
+ name_rev(commit, xstrdup(path), taggerdate, from_tag, deref);
}
return 0;
}
@@ -321,11 +369,10 @@ static const char *get_rev_name(const struct object *o, struct strbuf *buf)
if (!n->generation)
return n->tip_name;
else {
- int len = strlen(n->tip_name);
- if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
- len -= 2;
strbuf_reset(buf);
- strbuf_addf(buf, "%.*s~%d", len, n->tip_name, n->generation);
+ strbuf_addstr(buf, n->tip_name);
+ strbuf_strip_suffix(buf, "^0");
+ strbuf_addf(buf, "~%d", n->generation);
return buf->buf;
}
}