mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Christian Couder](/assets/img/avatar_default.png)
This is a cleanup patch to make it easier to use the "show_bisect_vars" function and take advantage of the rev_list_info struct. Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
557 lines
12 KiB
C
557 lines
12 KiB
C
#include "cache.h"
|
|
#include "commit.h"
|
|
#include "diff.h"
|
|
#include "revision.h"
|
|
#include "refs.h"
|
|
#include "list-objects.h"
|
|
#include "quote.h"
|
|
#include "sha1-lookup.h"
|
|
#include "bisect.h"
|
|
|
|
static unsigned char (*skipped_sha1)[20];
|
|
static int skipped_sha1_nr;
|
|
static int skipped_sha1_alloc;
|
|
|
|
static const char **rev_argv;
|
|
static int rev_argv_nr;
|
|
static int rev_argv_alloc;
|
|
|
|
/* bits #0-15 in revision.h */
|
|
|
|
#define COUNTED (1u<<16)
|
|
|
|
/*
|
|
* This is a truly stupid algorithm, but it's only
|
|
* used for bisection, and we just don't care enough.
|
|
*
|
|
* We care just barely enough to avoid recursing for
|
|
* non-merge entries.
|
|
*/
|
|
static int count_distance(struct commit_list *entry)
|
|
{
|
|
int nr = 0;
|
|
|
|
while (entry) {
|
|
struct commit *commit = entry->item;
|
|
struct commit_list *p;
|
|
|
|
if (commit->object.flags & (UNINTERESTING | COUNTED))
|
|
break;
|
|
if (!(commit->object.flags & TREESAME))
|
|
nr++;
|
|
commit->object.flags |= COUNTED;
|
|
p = commit->parents;
|
|
entry = p;
|
|
if (p) {
|
|
p = p->next;
|
|
while (p) {
|
|
nr += count_distance(p);
|
|
p = p->next;
|
|
}
|
|
}
|
|
}
|
|
|
|
return nr;
|
|
}
|
|
|
|
static void clear_distance(struct commit_list *list)
|
|
{
|
|
while (list) {
|
|
struct commit *commit = list->item;
|
|
commit->object.flags &= ~COUNTED;
|
|
list = list->next;
|
|
}
|
|
}
|
|
|
|
#define DEBUG_BISECT 0
|
|
|
|
static inline int weight(struct commit_list *elem)
|
|
{
|
|
return *((int*)(elem->item->util));
|
|
}
|
|
|
|
static inline void weight_set(struct commit_list *elem, int weight)
|
|
{
|
|
*((int*)(elem->item->util)) = weight;
|
|
}
|
|
|
|
static int count_interesting_parents(struct commit *commit)
|
|
{
|
|
struct commit_list *p;
|
|
int count;
|
|
|
|
for (count = 0, p = commit->parents; p; p = p->next) {
|
|
if (p->item->object.flags & UNINTERESTING)
|
|
continue;
|
|
count++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static inline int halfway(struct commit_list *p, int nr)
|
|
{
|
|
/*
|
|
* Don't short-cut something we are not going to return!
|
|
*/
|
|
if (p->item->object.flags & TREESAME)
|
|
return 0;
|
|
if (DEBUG_BISECT)
|
|
return 0;
|
|
/*
|
|
* 2 and 3 are halfway of 5.
|
|
* 3 is halfway of 6 but 2 and 4 are not.
|
|
*/
|
|
switch (2 * weight(p) - nr) {
|
|
case -1: case 0: case 1:
|
|
return 1;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#if !DEBUG_BISECT
|
|
#define show_list(a,b,c,d) do { ; } while (0)
|
|
#else
|
|
static void show_list(const char *debug, int counted, int nr,
|
|
struct commit_list *list)
|
|
{
|
|
struct commit_list *p;
|
|
|
|
fprintf(stderr, "%s (%d/%d)\n", debug, counted, nr);
|
|
|
|
for (p = list; p; p = p->next) {
|
|
struct commit_list *pp;
|
|
struct commit *commit = p->item;
|
|
unsigned flags = commit->object.flags;
|
|
enum object_type type;
|
|
unsigned long size;
|
|
char *buf = read_sha1_file(commit->object.sha1, &type, &size);
|
|
char *ep, *sp;
|
|
|
|
fprintf(stderr, "%c%c%c ",
|
|
(flags & TREESAME) ? ' ' : 'T',
|
|
(flags & UNINTERESTING) ? 'U' : ' ',
|
|
(flags & COUNTED) ? 'C' : ' ');
|
|
if (commit->util)
|
|
fprintf(stderr, "%3d", weight(p));
|
|
else
|
|
fprintf(stderr, "---");
|
|
fprintf(stderr, " %.*s", 8, sha1_to_hex(commit->object.sha1));
|
|
for (pp = commit->parents; pp; pp = pp->next)
|
|
fprintf(stderr, " %.*s", 8,
|
|
sha1_to_hex(pp->item->object.sha1));
|
|
|
|
sp = strstr(buf, "\n\n");
|
|
if (sp) {
|
|
sp += 2;
|
|
for (ep = sp; *ep && *ep != '\n'; ep++)
|
|
;
|
|
fprintf(stderr, " %.*s", (int)(ep - sp), sp);
|
|
}
|
|
fprintf(stderr, "\n");
|
|
}
|
|
}
|
|
#endif /* DEBUG_BISECT */
|
|
|
|
static struct commit_list *best_bisection(struct commit_list *list, int nr)
|
|
{
|
|
struct commit_list *p, *best;
|
|
int best_distance = -1;
|
|
|
|
best = list;
|
|
for (p = list; p; p = p->next) {
|
|
int distance;
|
|
unsigned flags = p->item->object.flags;
|
|
|
|
if (flags & TREESAME)
|
|
continue;
|
|
distance = weight(p);
|
|
if (nr - distance < distance)
|
|
distance = nr - distance;
|
|
if (distance > best_distance) {
|
|
best = p;
|
|
best_distance = distance;
|
|
}
|
|
}
|
|
|
|
return best;
|
|
}
|
|
|
|
struct commit_dist {
|
|
struct commit *commit;
|
|
int distance;
|
|
};
|
|
|
|
static int compare_commit_dist(const void *a_, const void *b_)
|
|
{
|
|
struct commit_dist *a, *b;
|
|
|
|
a = (struct commit_dist *)a_;
|
|
b = (struct commit_dist *)b_;
|
|
if (a->distance != b->distance)
|
|
return b->distance - a->distance; /* desc sort */
|
|
return hashcmp(a->commit->object.sha1, b->commit->object.sha1);
|
|
}
|
|
|
|
static struct commit_list *best_bisection_sorted(struct commit_list *list, int nr)
|
|
{
|
|
struct commit_list *p;
|
|
struct commit_dist *array = xcalloc(nr, sizeof(*array));
|
|
int cnt, i;
|
|
|
|
for (p = list, cnt = 0; p; p = p->next) {
|
|
int distance;
|
|
unsigned flags = p->item->object.flags;
|
|
|
|
if (flags & TREESAME)
|
|
continue;
|
|
distance = weight(p);
|
|
if (nr - distance < distance)
|
|
distance = nr - distance;
|
|
array[cnt].commit = p->item;
|
|
array[cnt].distance = distance;
|
|
cnt++;
|
|
}
|
|
qsort(array, cnt, sizeof(*array), compare_commit_dist);
|
|
for (p = list, i = 0; i < cnt; i++) {
|
|
struct name_decoration *r = xmalloc(sizeof(*r) + 100);
|
|
struct object *obj = &(array[i].commit->object);
|
|
|
|
sprintf(r->name, "dist=%d", array[i].distance);
|
|
r->next = add_decoration(&name_decoration, obj, r);
|
|
p->item = array[i].commit;
|
|
p = p->next;
|
|
}
|
|
if (p)
|
|
p->next = NULL;
|
|
free(array);
|
|
return list;
|
|
}
|
|
|
|
/*
|
|
* zero or positive weight is the number of interesting commits it can
|
|
* reach, including itself. Especially, weight = 0 means it does not
|
|
* reach any tree-changing commits (e.g. just above uninteresting one
|
|
* but traversal is with pathspec).
|
|
*
|
|
* weight = -1 means it has one parent and its distance is yet to
|
|
* be computed.
|
|
*
|
|
* weight = -2 means it has more than one parent and its distance is
|
|
* unknown. After running count_distance() first, they will get zero
|
|
* or positive distance.
|
|
*/
|
|
static struct commit_list *do_find_bisection(struct commit_list *list,
|
|
int nr, int *weights,
|
|
int find_all)
|
|
{
|
|
int n, counted;
|
|
struct commit_list *p;
|
|
|
|
counted = 0;
|
|
|
|
for (n = 0, p = list; p; p = p->next) {
|
|
struct commit *commit = p->item;
|
|
unsigned flags = commit->object.flags;
|
|
|
|
p->item->util = &weights[n++];
|
|
switch (count_interesting_parents(commit)) {
|
|
case 0:
|
|
if (!(flags & TREESAME)) {
|
|
weight_set(p, 1);
|
|
counted++;
|
|
show_list("bisection 2 count one",
|
|
counted, nr, list);
|
|
}
|
|
/*
|
|
* otherwise, it is known not to reach any
|
|
* tree-changing commit and gets weight 0.
|
|
*/
|
|
break;
|
|
case 1:
|
|
weight_set(p, -1);
|
|
break;
|
|
default:
|
|
weight_set(p, -2);
|
|
break;
|
|
}
|
|
}
|
|
|
|
show_list("bisection 2 initialize", counted, nr, list);
|
|
|
|
/*
|
|
* If you have only one parent in the resulting set
|
|
* then you can reach one commit more than that parent
|
|
* can reach. So we do not have to run the expensive
|
|
* count_distance() for single strand of pearls.
|
|
*
|
|
* However, if you have more than one parents, you cannot
|
|
* just add their distance and one for yourself, since
|
|
* they usually reach the same ancestor and you would
|
|
* end up counting them twice that way.
|
|
*
|
|
* So we will first count distance of merges the usual
|
|
* way, and then fill the blanks using cheaper algorithm.
|
|
*/
|
|
for (p = list; p; p = p->next) {
|
|
if (p->item->object.flags & UNINTERESTING)
|
|
continue;
|
|
if (weight(p) != -2)
|
|
continue;
|
|
weight_set(p, count_distance(p));
|
|
clear_distance(list);
|
|
|
|
/* Does it happen to be at exactly half-way? */
|
|
if (!find_all && halfway(p, nr))
|
|
return p;
|
|
counted++;
|
|
}
|
|
|
|
show_list("bisection 2 count_distance", counted, nr, list);
|
|
|
|
while (counted < nr) {
|
|
for (p = list; p; p = p->next) {
|
|
struct commit_list *q;
|
|
unsigned flags = p->item->object.flags;
|
|
|
|
if (0 <= weight(p))
|
|
continue;
|
|
for (q = p->item->parents; q; q = q->next) {
|
|
if (q->item->object.flags & UNINTERESTING)
|
|
continue;
|
|
if (0 <= weight(q))
|
|
break;
|
|
}
|
|
if (!q)
|
|
continue;
|
|
|
|
/*
|
|
* weight for p is unknown but q is known.
|
|
* add one for p itself if p is to be counted,
|
|
* otherwise inherit it from q directly.
|
|
*/
|
|
if (!(flags & TREESAME)) {
|
|
weight_set(p, weight(q)+1);
|
|
counted++;
|
|
show_list("bisection 2 count one",
|
|
counted, nr, list);
|
|
}
|
|
else
|
|
weight_set(p, weight(q));
|
|
|
|
/* Does it happen to be at exactly half-way? */
|
|
if (!find_all && halfway(p, nr))
|
|
return p;
|
|
}
|
|
}
|
|
|
|
show_list("bisection 2 counted all", counted, nr, list);
|
|
|
|
if (!find_all)
|
|
return best_bisection(list, nr);
|
|
else
|
|
return best_bisection_sorted(list, nr);
|
|
}
|
|
|
|
struct commit_list *find_bisection(struct commit_list *list,
|
|
int *reaches, int *all,
|
|
int find_all)
|
|
{
|
|
int nr, on_list;
|
|
struct commit_list *p, *best, *next, *last;
|
|
int *weights;
|
|
|
|
show_list("bisection 2 entry", 0, 0, list);
|
|
|
|
/*
|
|
* Count the number of total and tree-changing items on the
|
|
* list, while reversing the list.
|
|
*/
|
|
for (nr = on_list = 0, last = NULL, p = list;
|
|
p;
|
|
p = next) {
|
|
unsigned flags = p->item->object.flags;
|
|
|
|
next = p->next;
|
|
if (flags & UNINTERESTING)
|
|
continue;
|
|
p->next = last;
|
|
last = p;
|
|
if (!(flags & TREESAME))
|
|
nr++;
|
|
on_list++;
|
|
}
|
|
list = last;
|
|
show_list("bisection 2 sorted", 0, nr, list);
|
|
|
|
*all = nr;
|
|
weights = xcalloc(on_list, sizeof(*weights));
|
|
|
|
/* Do the real work of finding bisection commit. */
|
|
best = do_find_bisection(list, nr, weights, find_all);
|
|
if (best) {
|
|
if (!find_all)
|
|
best->next = NULL;
|
|
*reaches = weight(best);
|
|
}
|
|
free(weights);
|
|
return best;
|
|
}
|
|
|
|
static int register_ref(const char *refname, const unsigned char *sha1,
|
|
int flags, void *cb_data)
|
|
{
|
|
if (!strcmp(refname, "bad")) {
|
|
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
|
|
rev_argv[rev_argv_nr++] = xstrdup(sha1_to_hex(sha1));
|
|
} else if (!prefixcmp(refname, "good-")) {
|
|
const char *hex = sha1_to_hex(sha1);
|
|
char *good = xmalloc(strlen(hex) + 2);
|
|
*good = '^';
|
|
memcpy(good + 1, hex, strlen(hex) + 1);
|
|
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
|
|
rev_argv[rev_argv_nr++] = good;
|
|
} else if (!prefixcmp(refname, "skip-")) {
|
|
ALLOC_GROW(skipped_sha1, skipped_sha1_nr + 1,
|
|
skipped_sha1_alloc);
|
|
hashcpy(skipped_sha1[skipped_sha1_nr++], sha1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_bisect_refs(void)
|
|
{
|
|
return for_each_ref_in("refs/bisect/", register_ref, NULL);
|
|
}
|
|
|
|
void read_bisect_paths(void)
|
|
{
|
|
struct strbuf str = STRBUF_INIT;
|
|
const char *filename = git_path("BISECT_NAMES");
|
|
FILE *fp = fopen(filename, "r");
|
|
|
|
if (!fp)
|
|
die("Could not open file '%s': %s", filename, strerror(errno));
|
|
|
|
while (strbuf_getline(&str, fp, '\n') != EOF) {
|
|
char *quoted;
|
|
int res;
|
|
|
|
strbuf_trim(&str);
|
|
quoted = strbuf_detach(&str, NULL);
|
|
res = sq_dequote_to_argv(quoted, &rev_argv,
|
|
&rev_argv_nr, &rev_argv_alloc);
|
|
if (res)
|
|
die("Badly quoted content in file '%s': %s",
|
|
filename, quoted);
|
|
}
|
|
|
|
strbuf_release(&str);
|
|
fclose(fp);
|
|
}
|
|
|
|
static int skipcmp(const void *a, const void *b)
|
|
{
|
|
return hashcmp(a, b);
|
|
}
|
|
|
|
static void prepare_skipped(void)
|
|
{
|
|
qsort(skipped_sha1, skipped_sha1_nr, sizeof(*skipped_sha1), skipcmp);
|
|
}
|
|
|
|
static const unsigned char *skipped_sha1_access(size_t index, void *table)
|
|
{
|
|
unsigned char (*skipped)[20] = table;
|
|
return skipped[index];
|
|
}
|
|
|
|
static int lookup_skipped(unsigned char *sha1)
|
|
{
|
|
return sha1_pos(sha1, skipped_sha1, skipped_sha1_nr,
|
|
skipped_sha1_access);
|
|
}
|
|
|
|
struct commit_list *filter_skipped(struct commit_list *list,
|
|
struct commit_list **tried,
|
|
int show_all)
|
|
{
|
|
struct commit_list *filtered = NULL, **f = &filtered;
|
|
|
|
*tried = NULL;
|
|
|
|
if (!skipped_sha1_nr)
|
|
return list;
|
|
|
|
prepare_skipped();
|
|
|
|
while (list) {
|
|
struct commit_list *next = list->next;
|
|
list->next = NULL;
|
|
if (0 <= lookup_skipped(list->item->object.sha1)) {
|
|
/* Move current to tried list */
|
|
*tried = list;
|
|
tried = &list->next;
|
|
} else {
|
|
if (!show_all)
|
|
return list;
|
|
/* Move current to filtered list */
|
|
*f = list;
|
|
f = &list->next;
|
|
}
|
|
list = next;
|
|
}
|
|
|
|
return filtered;
|
|
}
|
|
|
|
static void bisect_rev_setup(struct rev_info *revs, const char *prefix)
|
|
{
|
|
init_revisions(revs, prefix);
|
|
revs->abbrev = 0;
|
|
revs->commit_format = CMIT_FMT_UNSPECIFIED;
|
|
|
|
/* argv[0] will be ignored by setup_revisions */
|
|
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
|
|
rev_argv[rev_argv_nr++] = xstrdup("bisect_rev_setup");
|
|
|
|
if (read_bisect_refs())
|
|
die("reading bisect refs failed");
|
|
|
|
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
|
|
rev_argv[rev_argv_nr++] = xstrdup("--");
|
|
|
|
read_bisect_paths();
|
|
|
|
ALLOC_GROW(rev_argv, rev_argv_nr + 1, rev_argv_alloc);
|
|
rev_argv[rev_argv_nr++] = NULL;
|
|
|
|
setup_revisions(rev_argv_nr, rev_argv, revs, NULL);
|
|
|
|
revs->limited = 1;
|
|
}
|
|
|
|
int bisect_next_vars(const char *prefix)
|
|
{
|
|
struct rev_info revs;
|
|
struct rev_list_info info;
|
|
int reaches = 0, all = 0;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
info.revs = &revs;
|
|
info.bisect_show_flags = BISECT_SHOW_TRIED | BISECT_SHOW_STRINGED;
|
|
|
|
bisect_rev_setup(&revs, prefix);
|
|
|
|
if (prepare_revision_walk(&revs))
|
|
die("revision walk setup failed");
|
|
if (revs.tree_objects)
|
|
mark_edges_uninteresting(revs.commits, &revs, NULL);
|
|
|
|
revs.commits = find_bisection(revs.commits, &reaches, &all,
|
|
!!skipped_sha1_nr);
|
|
|
|
return show_bisect_vars(&info, reaches, all);
|
|
}
|