#include "sha1-lookup.h"
#include "wt-status.h"
#include "advice.h"
+ #include "refs.h"
++#include "commit-reach.h"
static struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len, const char **);
clear_author_date_slab(&author_date);
}
-/* merge-base stuff */
-
-/* Remember to update object flag allocation in object.h */
-#define PARENT1 (1u<<16)
-#define PARENT2 (1u<<17)
-#define STALE (1u<<18)
-#define RESULT (1u<<19)
-
-static const unsigned all_flags = (PARENT1 | PARENT2 | STALE | RESULT);
-
-static int queue_has_nonstale(struct prio_queue *queue)
-{
- int i;
- for (i = 0; i < queue->nr; i++) {
- struct commit *commit = queue->array[i].data;
- if (!(commit->object.flags & STALE))
- return 1;
- }
- return 0;
-}
-
-/* all input commits in one and twos[] must have been parsed! */
-static struct commit_list *paint_down_to_common(struct commit *one, int n,
- struct commit **twos,
- int min_generation)
-{
- struct prio_queue queue = { compare_commits_by_gen_then_commit_date };
- struct commit_list *result = NULL;
- int i;
- uint32_t last_gen = GENERATION_NUMBER_INFINITY;
-
- one->object.flags |= PARENT1;
- if (!n) {
- commit_list_append(one, &result);
- return result;
- }
- prio_queue_put(&queue, one);
-
- for (i = 0; i < n; i++) {
- twos[i]->object.flags |= PARENT2;
- prio_queue_put(&queue, twos[i]);
- }
-
- while (queue_has_nonstale(&queue)) {
- struct commit *commit = prio_queue_get(&queue);
- struct commit_list *parents;
- int flags;
-
- if (commit->generation > last_gen)
- BUG("bad generation skip %8x > %8x at %s",
- commit->generation, last_gen,
- oid_to_hex(&commit->object.oid));
- last_gen = commit->generation;
-
- if (commit->generation < min_generation)
- break;
-
- flags = commit->object.flags & (PARENT1 | PARENT2 | STALE);
- if (flags == (PARENT1 | PARENT2)) {
- if (!(commit->object.flags & RESULT)) {
- commit->object.flags |= RESULT;
- commit_list_insert_by_date(commit, &result);
- }
- /* Mark parents of a found merge stale */
- flags |= STALE;
- }
- parents = commit->parents;
- while (parents) {
- struct commit *p = parents->item;
- parents = parents->next;
- if ((p->object.flags & flags) == flags)
- continue;
- if (parse_commit(p))
- return NULL;
- p->object.flags |= flags;
- prio_queue_put(&queue, p);
- }
- }
-
- clear_prio_queue(&queue);
- return result;
-}
-
-static struct commit_list *merge_bases_many(struct commit *one, int n, struct commit **twos)
-{
- struct commit_list *list = NULL;
- struct commit_list *result = NULL;
- int i;
-
- for (i = 0; i < n; i++) {
- if (one == twos[i])
- /*
- * We do not mark this even with RESULT so we do not
- * have to clean it up.
- */
- return commit_list_insert(one, &result);
- }
-
- if (parse_commit(one))
- return NULL;
- for (i = 0; i < n; i++) {
- if (parse_commit(twos[i]))
- return NULL;
- }
-
- list = paint_down_to_common(one, n, twos, 0);
-
- while (list) {
- struct commit *commit = pop_commit(&list);
- if (!(commit->object.flags & STALE))
- commit_list_insert_by_date(commit, &result);
- }
- return result;
-}
-
+ struct rev_collect {
+ struct commit **commit;
+ int nr;
+ int alloc;
+ unsigned int initial : 1;
+ };
+
+ static void add_one_commit(struct object_id *oid, struct rev_collect *revs)
+ {
+ struct commit *commit;
+
+ if (is_null_oid(oid))
+ return;
+
+ commit = lookup_commit(the_repository, oid);
+ if (!commit ||
+ (commit->object.flags & TMP_MARK) ||
+ parse_commit(commit))
+ return;
+
+ ALLOC_GROW(revs->commit, revs->nr + 1, revs->alloc);
+ revs->commit[revs->nr++] = commit;
+ commit->object.flags |= TMP_MARK;
+ }
+
+ static int collect_one_reflog_ent(struct object_id *ooid, struct object_id *noid,
+ const char *ident, timestamp_t timestamp,
+ int tz, const char *message, void *cbdata)
+ {
+ struct rev_collect *revs = cbdata;
+
+ if (revs->initial) {
+ revs->initial = 0;
+ add_one_commit(ooid, revs);
+ }
+ add_one_commit(noid, revs);
+ return 0;
+ }
+
+ struct commit *get_fork_point(const char *refname, struct commit *commit)
+ {
+ struct object_id oid;
+ struct rev_collect revs;
+ struct commit_list *bases;
+ int i;
+ struct commit *ret = NULL;
+
+ memset(&revs, 0, sizeof(revs));
+ revs.initial = 1;
+ for_each_reflog_ent(refname, collect_one_reflog_ent, &revs);
+
+ if (!revs.nr && !get_oid(refname, &oid))
+ add_one_commit(&oid, &revs);
+
+ for (i = 0; i < revs.nr; i++)
+ revs.commit[i]->object.flags &= ~TMP_MARK;
+
+ bases = get_merge_bases_many(commit, revs.nr, revs.commit);
+
+ /*
+ * There should be one and only one merge base, when we found
+ * a common ancestor among reflog entries.
+ */
+ if (!bases || bases->next)
+ goto cleanup_return;
+
+ /* And the found one must be one of the reflog entries */
+ for (i = 0; i < revs.nr; i++)
+ if (&bases->item->object == &revs.commit[i]->object)
+ break; /* found */
+ if (revs.nr <= i)
+ goto cleanup_return;
+
+ ret = bases->item;
+
+ cleanup_return:
+ free_commit_list(bases);
+ return ret;
+ }
+
-struct commit_list *get_octopus_merge_bases(struct commit_list *in)
-{
- struct commit_list *i, *j, *k, *ret = NULL;
-
- if (!in)
- return ret;
-
- commit_list_insert(in->item, &ret);
-
- for (i = in->next; i; i = i->next) {
- struct commit_list *new_commits = NULL, *end = NULL;
-
- for (j = ret; j; j = j->next) {
- struct commit_list *bases;
- bases = get_merge_bases(i->item, j->item);
- if (!new_commits)
- new_commits = bases;
- else
- end->next = bases;
- for (k = bases; k; k = k->next)
- end = k;
- }
- ret = new_commits;
- }
- return ret;
-}
-
-static int remove_redundant(struct commit **array, int cnt)
-{
- /*
- * Some commit in the array may be an ancestor of
- * another commit. Move such commit to the end of
- * the array, and return the number of commits that
- * are independent from each other.
- */
- struct commit **work;
- unsigned char *redundant;
- int *filled_index;
- int i, j, filled;
-
- work = xcalloc(cnt, sizeof(*work));
- redundant = xcalloc(cnt, 1);
- ALLOC_ARRAY(filled_index, cnt - 1);
-
- for (i = 0; i < cnt; i++)
- parse_commit(array[i]);
- for (i = 0; i < cnt; i++) {
- struct commit_list *common;
- uint32_t min_generation = array[i]->generation;
-
- if (redundant[i])
- continue;
- for (j = filled = 0; j < cnt; j++) {
- if (i == j || redundant[j])
- continue;
- filled_index[filled] = j;
- work[filled++] = array[j];
-
- if (array[j]->generation < min_generation)
- min_generation = array[j]->generation;
- }
- common = paint_down_to_common(array[i], filled, work,
- min_generation);
- if (array[i]->object.flags & PARENT2)
- redundant[i] = 1;
- for (j = 0; j < filled; j++)
- if (work[j]->object.flags & PARENT1)
- redundant[filled_index[j]] = 1;
- clear_commit_marks(array[i], all_flags);
- clear_commit_marks_many(filled, work, all_flags);
- free_commit_list(common);
- }
-
- /* Now collect the result */
- COPY_ARRAY(work, array, cnt);
- for (i = filled = 0; i < cnt; i++)
- if (!redundant[i])
- array[filled++] = work[i];
- for (j = filled, i = 0; i < cnt; i++)
- if (redundant[i])
- array[j++] = work[i];
- free(work);
- free(redundant);
- free(filled_index);
- return filled;
-}
-
-static struct commit_list *get_merge_bases_many_0(struct commit *one,
- int n,
- struct commit **twos,
- int cleanup)
-{
- struct commit_list *list;
- struct commit **rslt;
- struct commit_list *result;
- int cnt, i;
-
- result = merge_bases_many(one, n, twos);
- for (i = 0; i < n; i++) {
- if (one == twos[i])
- return result;
- }
- if (!result || !result->next) {
- if (cleanup) {
- clear_commit_marks(one, all_flags);
- clear_commit_marks_many(n, twos, all_flags);
- }
- return result;
- }
-
- /* There are more than one */
- cnt = commit_list_count(result);
- rslt = xcalloc(cnt, sizeof(*rslt));
- for (list = result, i = 0; list; list = list->next)
- rslt[i++] = list->item;
- free_commit_list(result);
-
- clear_commit_marks(one, all_flags);
- clear_commit_marks_many(n, twos, all_flags);
-
- cnt = remove_redundant(rslt, cnt);
- result = NULL;
- for (i = 0; i < cnt; i++)
- commit_list_insert_by_date(rslt[i], &result);
- free(rslt);
- return result;
-}
-
-struct commit_list *get_merge_bases_many(struct commit *one,
- int n,
- struct commit **twos)
-{
- return get_merge_bases_many_0(one, n, twos, 1);
-}
-
-struct commit_list *get_merge_bases_many_dirty(struct commit *one,
- int n,
- struct commit **twos)
-{
- return get_merge_bases_many_0(one, n, twos, 0);
-}
-
-struct commit_list *get_merge_bases(struct commit *one, struct commit *two)
-{
- return get_merge_bases_many_0(one, 1, &two, 1);
-}
-
-/*
- * Is "commit" a descendant of one of the elements on the "with_commit" list?
- */
-int is_descendant_of(struct commit *commit, struct commit_list *with_commit)
-{
- if (!with_commit)
- return 1;
- while (with_commit) {
- struct commit *other;
-
- other = with_commit->item;
- with_commit = with_commit->next;
- if (in_merge_bases(other, commit))
- return 1;
- }
- return 0;
-}
-
-/*
- * Is "commit" an ancestor of one of the "references"?
- */
-int in_merge_bases_many(struct commit *commit, int nr_reference, struct commit **reference)
-{
- struct commit_list *bases;
- int ret = 0, i;
- uint32_t min_generation = GENERATION_NUMBER_INFINITY;
-
- if (parse_commit(commit))
- return ret;
- for (i = 0; i < nr_reference; i++) {
- if (parse_commit(reference[i]))
- return ret;
- if (reference[i]->generation < min_generation)
- min_generation = reference[i]->generation;
- }
-
- if (commit->generation > min_generation)
- return ret;
-
- bases = paint_down_to_common(commit, nr_reference, reference, commit->generation);
- if (commit->object.flags & PARENT2)
- ret = 1;
- clear_commit_marks(commit, all_flags);
- clear_commit_marks_many(nr_reference, reference, all_flags);
- free_commit_list(bases);
- return ret;
-}
-
-/*
- * Is "commit" an ancestor of (i.e. reachable from) the "reference"?
- */
-int in_merge_bases(struct commit *commit, struct commit *reference)
-{
- return in_merge_bases_many(commit, 1, &reference);
-}
-
-struct commit_list *reduce_heads(struct commit_list *heads)
-{
- struct commit_list *p;
- struct commit_list *result = NULL, **tail = &result;
- struct commit **array;
- int num_head, i;
-
- if (!heads)
- return NULL;
-
- /* Uniquify */
- for (p = heads; p; p = p->next)
- p->item->object.flags &= ~STALE;
- for (p = heads, num_head = 0; p; p = p->next) {
- if (p->item->object.flags & STALE)
- continue;
- p->item->object.flags |= STALE;
- num_head++;
- }
- array = xcalloc(num_head, sizeof(*array));
- for (p = heads, i = 0; p; p = p->next) {
- if (p->item->object.flags & STALE) {
- array[i++] = p->item;
- p->item->object.flags &= ~STALE;
- }
- }
- num_head = remove_redundant(array, num_head);
- for (i = 0; i < num_head; i++)
- tail = &commit_list_insert(array[i], tail)->next;
- free(array);
- return result;
-}
-
-void reduce_heads_replace(struct commit_list **heads)
-{
- struct commit_list *result = reduce_heads(*heads);
- free_commit_list(*heads);
- *heads = result;
-}
-
static const char gpg_sig_header[] = "gpgsig";
static const int gpg_sig_header_len = sizeof(gpg_sig_header) - 1;