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Merge branch 'cc/bisect-filter'

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* cc/bisect-filter: (21 commits)
  rev-list: add "int bisect_show_flags" in "struct rev_list_info"
  rev-list: remove last static vars used in "show_commit"
  list-objects: add "void *data" parameter to show functions
  bisect--helper: string output variables together with "&&"
  rev-list: pass "int flags" as last argument of "show_bisect_vars"
  t6030: test bisecting with paths
  bisect: use "bisect--helper" and remove "filter_skipped" function
  bisect: implement "read_bisect_paths" to read paths in "$GIT_DIR/BISECT_NAMES"
  bisect--helper: implement "git bisect--helper"
  bisect: use the new generic "sha1_pos" function to lookup sha1
  rev-list: call new "filter_skip" function
  patch-ids: use the new generic "sha1_pos" function to lookup sha1
  sha1-lookup: add new "sha1_pos" function to efficiently lookup sha1
  rev-list: pass "revs" to "show_bisect_vars"
  rev-list: make "show_bisect_vars" non static
  rev-list: move code to show bisect vars into its own function
  rev-list: move bisect related code into its own file
  rev-list: make "bisect_list" variable local to "cmd_rev_list"
  refs: add "for_each_ref_in" function to refactor "for_each_*_ref" functions
  quote: add "sq_dequote_to_argv" to put unwrapped args in an argv array
  ...
This commit is contained in:
Junio C Hamano 2009-04-12 16:46:40 -07:00
commit 6e353a5e5d
20 changed files with 985 additions and 665 deletions
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2
Makefile
View File

@ -432,6 +432,7 @@ LIB_OBJS += archive-tar.o
LIB_OBJS += archive-zip.o
LIB_OBJS += attr.o
LIB_OBJS += base85.o
LIB_OBJS += bisect.o
LIB_OBJS += blob.o
LIB_OBJS += branch.o
LIB_OBJS += bundle.o
@ -532,6 +533,7 @@ BUILTIN_OBJS += builtin-add.o
BUILTIN_OBJS += builtin-annotate.o
BUILTIN_OBJS += builtin-apply.o
BUILTIN_OBJS += builtin-archive.o
BUILTIN_OBJS += builtin-bisect--helper.o
BUILTIN_OBJS += builtin-blame.o
BUILTIN_OBJS += builtin-branch.o
BUILTIN_OBJS += builtin-bundle.o

556
bisect.c Normal file
View File

@ -0,0 +1,556 @@
#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);
}

29
bisect.h Normal file
View File

@ -0,0 +1,29 @@
#ifndef BISECT_H
#define BISECT_H
extern struct commit_list *find_bisection(struct commit_list *list,
int *reaches, int *all,
int find_all);
extern struct commit_list *filter_skipped(struct commit_list *list,
struct commit_list **tried,
int show_all);
/* bisect_show_flags flags in struct rev_list_info */
#define BISECT_SHOW_ALL (1<<0)
#define BISECT_SHOW_TRIED (1<<1)
#define BISECT_SHOW_STRINGED (1<<2)
struct rev_list_info {
struct rev_info *revs;
int bisect_show_flags;
int show_timestamp;
int hdr_termination;
const char *header_prefix;
};
extern int show_bisect_vars(struct rev_list_info *info, int reaches, int all);
extern int bisect_next_vars(const char *prefix);
#endif

27
builtin-bisect--helper.c Normal file
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@ -0,0 +1,27 @@
#include "builtin.h"
#include "cache.h"
#include "parse-options.h"
#include "bisect.h"
static const char * const git_bisect_helper_usage[] = {
"git bisect--helper --next-vars",
NULL
};
int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
{
int next_vars = 0;
struct option options[] = {
OPT_BOOLEAN(0, "next-vars", &next_vars,
"output next bisect step variables"),
OPT_END()
};
argc = parse_options(argc, argv, options, git_bisect_helper_usage, 0);
if (!next_vars)
usage_with_options(git_bisect_helper_usage, options);
/* next-vars */
return bisect_next_vars(prefix);
}

6
builtin-pack-objects.c
View File

@ -1901,13 +1901,13 @@ static void read_object_list_from_stdin(void)
#define OBJECT_ADDED (1u<<20)
static void show_commit(struct commit *commit)
static void show_commit(struct commit *commit, void *data)
{
add_object_entry(commit->object.sha1, OBJ_COMMIT, NULL, 0);
commit->object.flags |= OBJECT_ADDED;
}
static void show_object(struct object_array_entry *p)
static void show_object(struct object_array_entry *p, void *data)
{
add_preferred_base_object(p->name);
add_object_entry(p->item->sha1, p->item->type, p->name, 0);
@ -2073,7 +2073,7 @@ static void get_object_list(int ac, const char **av)
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
mark_edges_uninteresting(revs.commits, &revs, show_edge);
traverse_commit_list(&revs, show_commit, show_object);
traverse_commit_list(&revs, show_commit, show_object, NULL);
if (keep_unreachable)
add_objects_in_unpacked_packs(&revs);

596
builtin-rev-list.c
View File

@ -1,20 +1,12 @@
#include "cache.h"
#include "refs.h"
#include "tag.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "tree-walk.h"
#include "diff.h"
#include "revision.h"
#include "list-objects.h"
#include "builtin.h"
#include "log-tree.h"
#include "graph.h"
/* bits #0-15 in revision.h */
#define COUNTED (1u<<16)
#include "bisect.h"
static const char rev_list_usage[] =
"git rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
@ -50,73 +42,69 @@ static const char rev_list_usage[] =
" --bisect-all"
;
static struct rev_info revs;
static int bisect_list;
static int show_timestamp;
static int hdr_termination;
static const char *header_prefix;
static void finish_commit(struct commit *commit);
static void show_commit(struct commit *commit)
static void finish_commit(struct commit *commit, void *data);
static void show_commit(struct commit *commit, void *data)
{
graph_show_commit(revs.graph);
struct rev_list_info *info = data;
struct rev_info *revs = info->revs;
if (show_timestamp)
graph_show_commit(revs->graph);
if (info->show_timestamp)
printf("%lu ", commit->date);
if (header_prefix)
fputs(header_prefix, stdout);
if (info->header_prefix)
fputs(info->header_prefix, stdout);
if (!revs.graph) {
if (!revs->graph) {
if (commit->object.flags & BOUNDARY)
putchar('-');
else if (commit->object.flags & UNINTERESTING)
putchar('^');
else if (revs.left_right) {
else if (revs->left_right) {
if (commit->object.flags & SYMMETRIC_LEFT)
putchar('<');
else
putchar('>');
}
}
if (revs.abbrev_commit && revs.abbrev)
fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
if (revs->abbrev_commit && revs->abbrev)
fputs(find_unique_abbrev(commit->object.sha1, revs->abbrev),
stdout);
else
fputs(sha1_to_hex(commit->object.sha1), stdout);
if (revs.print_parents) {
if (revs->print_parents) {
struct commit_list *parents = commit->parents;
while (parents) {
printf(" %s", sha1_to_hex(parents->item->object.sha1));
parents = parents->next;
}
}
if (revs.children.name) {
if (revs->children.name) {
struct commit_list *children;
children = lookup_decoration(&revs.children, &commit->object);
children = lookup_decoration(&revs->children, &commit->object);
while (children) {
printf(" %s", sha1_to_hex(children->item->object.sha1));
children = children->next;
}
}
show_decorations(&revs, commit);
if (revs.commit_format == CMIT_FMT_ONELINE)
show_decorations(revs, commit);
if (revs->commit_format == CMIT_FMT_ONELINE)
putchar(' ');
else
putchar('\n');
if (revs.verbose_header && commit->buffer) {
if (revs->verbose_header && commit->buffer) {
struct strbuf buf = STRBUF_INIT;
pretty_print_commit(revs.commit_format, commit,
&buf, revs.abbrev, NULL, NULL,
revs.date_mode, 0);
if (revs.graph) {
pretty_print_commit(revs->commit_format, commit,
&buf, revs->abbrev, NULL, NULL,
revs->date_mode, 0);
if (revs->graph) {
if (buf.len) {
if (revs.commit_format != CMIT_FMT_ONELINE)
graph_show_oneline(revs.graph);
if (revs->commit_format != CMIT_FMT_ONELINE)
graph_show_oneline(revs->graph);
graph_show_commit_msg(revs.graph, &buf);
graph_show_commit_msg(revs->graph, &buf);
/*
* Add a newline after the commit message.
@ -134,7 +122,7 @@ static void show_commit(struct commit *commit)
* format doesn't explicitly end in a newline.)
*/
if (buf.len && buf.buf[buf.len - 1] == '\n')
graph_show_padding(revs.graph);
graph_show_padding(revs->graph);
putchar('\n');
} else {
/*
@ -142,23 +130,23 @@ static void show_commit(struct commit *commit)
* the rest of the graph output for this
* commit.
*/
if (graph_show_remainder(revs.graph))
if (graph_show_remainder(revs->graph))
putchar('\n');
}
} else {
if (buf.len)
printf("%s%c", buf.buf, hdr_termination);
printf("%s%c", buf.buf, info->hdr_termination);
}
strbuf_release(&buf);
} else {
if (graph_show_remainder(revs.graph))
if (graph_show_remainder(revs->graph))
putchar('\n');
}
maybe_flush_or_die(stdout, "stdout");
finish_commit(commit);
finish_commit(commit, data);
}
static void finish_commit(struct commit *commit)
static void finish_commit(struct commit *commit, void *data)
{
if (commit->parents) {
free_commit_list(commit->parents);
@ -168,20 +156,20 @@ static void finish_commit(struct commit *commit)
commit->buffer = NULL;
}
static void finish_object(struct object_array_entry *p)
static void finish_object(struct object_array_entry *p, void *data)
{
if (p->item->type == OBJ_BLOB && !has_sha1_file(p->item->sha1))
die("missing blob object '%s'", sha1_to_hex(p->item->sha1));
}
static void show_object(struct object_array_entry *p)
static void show_object(struct object_array_entry *p, void *data)
{
/* An object with name "foo\n0000000..." can be used to
* confuse downstream "git pack-objects" very badly.
*/
const char *ep = strchr(p->name, '\n');
finish_object(p);
finish_object(p, data);
if (ep) {
printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
(int) (ep - p->name),
@ -196,384 +184,6 @@ static void show_edge(struct commit *commit)
printf("-%s\n", sha1_to_hex(commit->object.sha1));
}
/*
* 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);
}
static 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 inline int log2i(int n)
{
int log2 = 0;
@ -613,11 +223,83 @@ static int estimate_bisect_steps(int all)
return (e < 3 * x) ? n : n - 1;
}
static void show_tried_revs(struct commit_list *tried, int stringed)
{
printf("bisect_tried='");
for (;tried; tried = tried->next) {
char *format = tried->next ? "%s|" : "%s";
printf(format, sha1_to_hex(tried->item->object.sha1));
}
printf(stringed ? "' &&\n" : "'\n");
}
int show_bisect_vars(struct rev_list_info *info, int reaches, int all)
{
int cnt, flags = info->bisect_show_flags;
char hex[41] = "", *format;
struct commit_list *tried;
struct rev_info *revs = info->revs;
if (!revs->commits && !(flags & BISECT_SHOW_TRIED))
return 1;
revs->commits = filter_skipped(revs->commits, &tried, flags & BISECT_SHOW_ALL);
/*
* revs->commits can reach "reaches" commits among
* "all" commits. If it is good, then there are
* (all-reaches) commits left to be bisected.
* On the other hand, if it is bad, then the set
* to bisect is "reaches".
* A bisect set of size N has (N-1) commits further
* to test, as we already know one bad one.
*/
cnt = all - reaches;
if (cnt < reaches)
cnt = reaches;
if (revs->commits)
strcpy(hex, sha1_to_hex(revs->commits->item->object.sha1));
if (flags & BISECT_SHOW_ALL) {
traverse_commit_list(revs, show_commit, show_object, info);
printf("------\n");
}
if (flags & BISECT_SHOW_TRIED)
show_tried_revs(tried, flags & BISECT_SHOW_STRINGED);
format = (flags & BISECT_SHOW_STRINGED) ?
"bisect_rev=%s &&\n"
"bisect_nr=%d &&\n"
"bisect_good=%d &&\n"
"bisect_bad=%d &&\n"
"bisect_all=%d &&\n"
"bisect_steps=%d\n"
:
"bisect_rev=%s\n"
"bisect_nr=%d\n"
"bisect_good=%d\n"
"bisect_bad=%d\n"
"bisect_all=%d\n"
"bisect_steps=%d\n";
printf(format,
hex,
cnt - 1,
all - reaches - 1,
reaches - 1,
all,
estimate_bisect_steps(all));
return 0;
}
int cmd_rev_list(int argc, const char **argv, const char *prefix)
{
struct commit_list *list;
struct rev_info revs;
struct rev_list_info info;
int i;
int read_from_stdin = 0;
int bisect_list = 0;
int bisect_show_vars = 0;
int bisect_find_all = 0;
int quiet = 0;
@ -628,6 +310,9 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
revs.commit_format = CMIT_FMT_UNSPECIFIED;
argc = setup_revisions(argc, argv, &revs, NULL);
memset(&info, 0, sizeof(info));
info.revs = &revs;
quiet = DIFF_OPT_TST(&revs.diffopt, QUIET);
for (i = 1 ; i < argc; i++) {
const char *arg = argv[i];
@ -637,7 +322,7 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
continue;
}
if (!strcmp(arg, "--timestamp")) {
show_timestamp = 1;
info.show_timestamp = 1;
continue;
}
if (!strcmp(arg, "--bisect")) {
@ -647,6 +332,7 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
if (!strcmp(arg, "--bisect-all")) {
bisect_list = 1;
bisect_find_all = 1;
info.bisect_show_flags = BISECT_SHOW_ALL;
revs.show_decorations = 1;
continue;
}
@ -666,19 +352,17 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
}
if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
/* The command line has a --pretty */
hdr_termination = '\n';
info.hdr_termination = '\n';
if (revs.commit_format == CMIT_FMT_ONELINE)
header_prefix = "";
info.header_prefix = "";
else
header_prefix = "commit ";
info.header_prefix = "commit ";
}
else if (revs.verbose_header)
/* Only --header was specified */
revs.commit_format = CMIT_FMT_RAW;
list = revs.commits;
if ((!list &&
if ((!revs.commits &&
(!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
!revs.pending.nr)) ||
revs.diff)
@ -699,49 +383,15 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
revs.commits = find_bisection(revs.commits, &reaches, &all,
bisect_find_all);
if (bisect_show_vars) {
int cnt;
char hex[41];
if (!revs.commits)
return 1;
/*
* revs.commits can reach "reaches" commits among
* "all" commits. If it is good, then there are
* (all-reaches) commits left to be bisected.
* On the other hand, if it is bad, then the set
* to bisect is "reaches".
* A bisect set of size N has (N-1) commits further
* to test, as we already know one bad one.
*/
cnt = all - reaches;
if (cnt < reaches)
cnt = reaches;
strcpy(hex, sha1_to_hex(revs.commits->item->object.sha1));
if (bisect_find_all) {
traverse_commit_list(&revs, show_commit, show_object);
printf("------\n");
}
printf("bisect_rev=%s\n"
"bisect_nr=%d\n"
"bisect_good=%d\n"
"bisect_bad=%d\n"
"bisect_all=%d\n"
"bisect_steps=%d\n",
hex,
cnt - 1,
all - reaches - 1,
reaches - 1,
all,
estimate_bisect_steps(all));
return 0;
}
if (bisect_show_vars)
return show_bisect_vars(&info, reaches, all);
}
traverse_commit_list(&revs,
quiet ? finish_commit : show_commit,
quiet ? finish_object : show_object);
quiet ? finish_commit : show_commit,
quiet ? finish_object : show_object,
&info);
return 0;
}

1
builtin.h
View File

@ -25,6 +25,7 @@ extern int cmd_add(int argc, const char **argv, const char *prefix);
extern int cmd_annotate(int argc, const char **argv, const char *prefix);
extern int cmd_apply(int argc, const char **argv, const char *prefix);
extern int cmd_archive(int argc, const char **argv, const char *prefix);
extern int cmd_bisect__helper(int argc, const char **argv, const char *prefix);
extern int cmd_blame(int argc, const char **argv, const char *prefix);
extern int cmd_branch(int argc, const char **argv, const char *prefix);
extern int cmd_bundle(int argc, const char **argv, const char *prefix);

94
git-bisect.sh
View File

@ -279,87 +279,14 @@ bisect_auto_next() {
bisect_next_check && bisect_next || :
}
filter_skipped() {
_eval="$1"
_skip="$2"
if [ -z "$_skip" ]; then
eval "$_eval" | {
while read line
do
echo "$line &&"
done
echo ':'
}
return
fi
# Let's parse the output of:
# "git rev-list --bisect-vars --bisect-all ..."
eval "$_eval" | {
VARS= FOUND= TRIED=
while read hash line
do
case "$VARS,$FOUND,$TRIED,$hash" in
1,*,*,*)
# "bisect_foo=bar" read from rev-list output.
echo "$hash &&"
;;
,*,*,---*)
# Separator
;;
,,,bisect_rev*)
# We had nothing to search.
echo "bisect_rev= &&"
VARS=1
;;
,,*,bisect_rev*)
# We did not find a good bisect rev.
# This should happen only if the "bad"
# commit is also a "skip" commit.
echo "bisect_rev='$TRIED' &&"
VARS=1
;;
,,*,*)
# We are searching.
TRIED="${TRIED:+$TRIED|}$hash"
case "$_skip" in
*$hash*) ;;
*)
echo "bisect_rev=$hash &&"
echo "bisect_tried='$TRIED' &&"
FOUND=1
;;
esac
;;
,1,*,bisect_rev*)
# We have already found a rev to be tested.
VARS=1
;;
,1,*,*)
;;
*)
# Unexpected input
echo "die 'filter_skipped error'"
die "filter_skipped error " \
"VARS: '$VARS' " \
"FOUND: '$FOUND' " \
"TRIED: '$TRIED' " \
"hash: '$hash' " \
"line: '$line'"
;;
esac
done
echo ':'
}
}
exit_if_skipped_commits () {
_tried=$1
if expr "$_tried" : ".*[|].*" > /dev/null ; then
_bad=$2
if test -n "$_tried" ; then
echo "There are only 'skip'ped commit left to test."
echo "The first bad commit could be any of:"
echo "$_tried" | tr '[|]' '[\012]'
test -n "$_bad" && echo "$_bad"
echo "We cannot bisect more!"
exit 2
fi
@ -490,28 +417,23 @@ bisect_next() {
test "$?" -eq "1" && return
# Get bisection information
BISECT_OPT=''
test -n "$skip" && BISECT_OPT='--bisect-all'
eval="git rev-list --bisect-vars $BISECT_OPT $good $bad --" &&
eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
eval=$(filter_skipped "$eval" "$skip") &&
eval=$(eval "git bisect--helper --next-vars") &&
eval "$eval" || exit
if [ -z "$bisect_rev" ]; then
# We should exit here only if the "bad"
# commit is also a "skip" commit (see above).
exit_if_skipped_commits "$bisect_tried"
echo "$bad was both good and bad"
exit 1
fi
if [ "$bisect_rev" = "$bad" ]; then
exit_if_skipped_commits "$bisect_tried"
exit_if_skipped_commits "$bisect_tried" "$bad"
echo "$bisect_rev is first bad commit"
git diff-tree --pretty $bisect_rev
exit 0
fi
# We should exit here only if the "bad"
# commit is also a "skip" commit (see above).
exit_if_skipped_commits "$bisect_rev"
bisect_checkout "$bisect_rev" "$bisect_nr revisions left to test after this (roughly $bisect_steps steps)"
}

1
git.c
View File

@ -274,6 +274,7 @@ static void handle_internal_command(int argc, const char **argv)
{ "annotate", cmd_annotate, RUN_SETUP },
{ "apply", cmd_apply },
{ "archive", cmd_archive },
{ "bisect--helper", cmd_bisect__helper, RUN_SETUP | NEED_WORK_TREE },
{ "blame", cmd_blame, RUN_SETUP },
{ "branch", cmd_branch, RUN_SETUP },
{ "bundle", cmd_bundle },

9
list-objects.c
View File

@ -135,8 +135,9 @@ void mark_edges_uninteresting(struct commit_list *list,
}
void traverse_commit_list(struct rev_info *revs,
void (*show_commit)(struct commit *),
void (*show_object)(struct object_array_entry *))
show_commit_fn show_commit,
show_object_fn show_object,
void *data)
{
int i;
struct commit *commit;
@ -144,7 +145,7 @@ void traverse_commit_list(struct rev_info *revs,
while ((commit = get_revision(revs)) != NULL) {
process_tree(revs, commit->tree, &objects, NULL, "");
show_commit(commit);
show_commit(commit, data);
}
for (i = 0; i < revs->pending.nr; i++) {
struct object_array_entry *pending = revs->pending.objects + i;
@ -171,7 +172,7 @@ void traverse_commit_list(struct rev_info *revs,
sha1_to_hex(obj->sha1), name);
}
for (i = 0; i < objects.nr; i++)
show_object(&objects.objects[i]);
show_object(&objects.objects[i], data);
free(objects.objects);
if (revs->pending.nr) {
free(revs->pending.objects);

6
list-objects.h
View File

@ -1,11 +1,11 @@
#ifndef LIST_OBJECTS_H
#define LIST_OBJECTS_H
typedef void (*show_commit_fn)(struct commit *);
typedef void (*show_object_fn)(struct object_array_entry *);
typedef void (*show_commit_fn)(struct commit *, void *);
typedef void (*show_object_fn)(struct object_array_entry *, void *);
typedef void (*show_edge_fn)(struct commit *);
void traverse_commit_list(struct rev_info *revs, show_commit_fn, show_object_fn);
void traverse_commit_list(struct rev_info *, show_commit_fn, show_object_fn, void *);
void mark_edges_uninteresting(struct commit_list *, struct rev_info *, show_edge_fn);

93
patch-ids.c
View File

@ -1,6 +1,7 @@
#include "cache.h"
#include "diff.h"
#include "commit.h"
#include "sha1-lookup.h"
#include "patch-ids.h"
static int commit_patch_id(struct commit *commit, struct diff_options *options,
@ -15,99 +16,15 @@ static int commit_patch_id(struct commit *commit, struct diff_options *options,
return diff_flush_patch_id(options, sha1);
}
static uint32_t take2(const unsigned char *id)
static const unsigned char *patch_id_access(size_t index, void *table)
{
return ((id[0] << 8) | id[1]);
struct patch_id **id_table = table;
return id_table[index]->patch_id;
}
/*
* Conventional binary search loop looks like this:
*
* do {
* int mi = (lo + hi) / 2;
* int cmp = "entry pointed at by mi" minus "target";
* if (!cmp)
* return (mi is the wanted one)
* if (cmp > 0)
* hi = mi; "mi is larger than target"
* else
* lo = mi+1; "mi is smaller than target"
* } while (lo < hi);
*
* The invariants are:
*
* - When entering the loop, lo points at a slot that is never
* above the target (it could be at the target), hi points at a
* slot that is guaranteed to be above the target (it can never
* be at the target).
*
* - We find a point 'mi' between lo and hi (mi could be the same
* as lo, but never can be the same as hi), and check if it hits
* the target. There are three cases:
*
* - if it is a hit, we are happy.
*
* - if it is strictly higher than the target, we update hi with
* it.
*
* - if it is strictly lower than the target, we update lo to be
* one slot after it, because we allow lo to be at the target.
*
* When choosing 'mi', we do not have to take the "middle" but
* anywhere in between lo and hi, as long as lo <= mi < hi is
* satisfied. When we somehow know that the distance between the
* target and lo is much shorter than the target and hi, we could
* pick mi that is much closer to lo than the midway.
*/
static int patch_pos(struct patch_id **table, int nr, const unsigned char *id)
{
int hi = nr;
int lo = 0;
int mi = 0;
if (!nr)
return -1;
if (nr != 1) {
unsigned lov, hiv, miv, ofs;
for (ofs = 0; ofs < 18; ofs += 2) {
lov = take2(table[0]->patch_id + ofs);
hiv = take2(table[nr-1]->patch_id + ofs);
miv = take2(id + ofs);
if (miv < lov)
return -1;
if (hiv < miv)
return -1 - nr;
if (lov != hiv) {
/*
* At this point miv could be equal
* to hiv (but id could still be higher);
* the invariant of (mi < hi) should be
* kept.
*/
mi = (nr-1) * (miv - lov) / (hiv - lov);
if (lo <= mi && mi < hi)
break;
die("oops");
}
}
if (18 <= ofs)
die("cannot happen -- lo and hi are identical");
}
do {
int cmp;
cmp = hashcmp(table[mi]->patch_id, id);
if (!cmp)
return mi;
if (cmp > 0)
hi = mi;
else
lo = mi + 1;
mi = (hi + lo) / 2;
} while (lo < hi);
return -lo-1;
return sha1_pos(id, table, nr, patch_id_access);
}
#define BUCKET_SIZE 190 /* 190 * 21 = 3990, with slop close enough to 4K */

35
quote.c
View File

@ -72,7 +72,7 @@ void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
}
}
char *sq_dequote(char *arg)
char *sq_dequote_step(char *arg, char **next)
{
char *dst = arg;
char *src = arg;
@ -92,6 +92,8 @@ char *sq_dequote(char *arg)
switch (*++src) {
case '\0':
*dst = 0;
if (next)
*next = NULL;
return arg;
case '\\':
c = *++src;
@ -101,11 +103,40 @@ char *sq_dequote(char *arg)
}
/* Fallthrough */
default:
return NULL;
if (!next || !isspace(*src))
return NULL;
do {
c = *++src;
} while (isspace(c));
*dst = 0;
*next = src;
return arg;
}
}
}
char *sq_dequote(char *arg)
{
return sq_dequote_step(arg, NULL);
}
int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc)
{
char *next = arg;
if (!*arg)
return 0;
do {
char *dequoted = sq_dequote_step(next, &next);
if (!dequoted)
return -1;
ALLOC_GROW(*argv, *nr + 1, *alloc);
(*argv)[(*nr)++] = dequoted;
} while (next);
return 0;
}
/* 1 means: quote as octal
* 0 means: quote as octal if (quote_path_fully)
* -1 means: never quote

9
quote.h
View File

@ -39,6 +39,15 @@ extern void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
*/
extern char *sq_dequote(char *);
/*
* Same as the above, but can be used to unwrap many arguments in the
* same string separated by space. "next" is changed to point to the
* next argument that should be passed as first parameter. When there
* is no more argument to be dequoted, "next" is updated to point to NULL.
*/
extern char *sq_dequote_step(char *arg, char **next);
extern int sq_dequote_to_argv(char *arg, const char ***argv, int *nr, int *alloc);
extern int unquote_c_style(struct strbuf *, const char *quoted, const char **endp);
extern size_t quote_c_style(const char *name, struct strbuf *, FILE *, int no_dq);
extern void quote_two_c_style(struct strbuf *, const char *, const char *, int);

11
refs.c
View File

@ -647,19 +647,24 @@ int for_each_ref(each_ref_fn fn, void *cb_data)
return do_for_each_ref("refs/", fn, 0, 0, cb_data);
}
int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
{
return do_for_each_ref(prefix, fn, strlen(prefix), 0, cb_data);
}
int for_each_tag_ref(each_ref_fn fn, void *cb_data)
{
return do_for_each_ref("refs/tags/", fn, 10, 0, cb_data);
return for_each_ref_in("refs/tags/", fn, cb_data);
}
int for_each_branch_ref(each_ref_fn fn, void *cb_data)
{
return do_for_each_ref("refs/heads/", fn, 11, 0, cb_data);
return for_each_ref_in("refs/heads/", fn, cb_data);
}
int for_each_remote_ref(each_ref_fn fn, void *cb_data)
{
return do_for_each_ref("refs/remotes/", fn, 13, 0, cb_data);
return for_each_ref_in("refs/remotes/", fn, cb_data);
}
int for_each_rawref(each_ref_fn fn, void *cb_data)

1
refs.h
View File

@ -20,6 +20,7 @@ struct ref_lock {
typedef int each_ref_fn(const char *refname, const unsigned char *sha1, int flags, void *cb_data);
extern int head_ref(each_ref_fn, void *);
extern int for_each_ref(each_ref_fn, void *);
extern int for_each_ref_in(const char *, each_ref_fn, void *);
extern int for_each_tag_ref(each_ref_fn, void *);
extern int for_each_branch_ref(each_ref_fn, void *);
extern int for_each_remote_ref(each_ref_fn, void *);

101
sha1-lookup.c
View File

@ -1,6 +1,107 @@
#include "cache.h"
#include "sha1-lookup.h"
static uint32_t take2(const unsigned char *sha1)
{
return ((sha1[0] << 8) | sha1[1]);
}
/*
* Conventional binary search loop looks like this:
*
* do {
* int mi = (lo + hi) / 2;
* int cmp = "entry pointed at by mi" minus "target";
* if (!cmp)
* return (mi is the wanted one)
* if (cmp > 0)
* hi = mi; "mi is larger than target"
* else
* lo = mi+1; "mi is smaller than target"
* } while (lo < hi);
*
* The invariants are:
*
* - When entering the loop, lo points at a slot that is never
* above the target (it could be at the target), hi points at a
* slot that is guaranteed to be above the target (it can never
* be at the target).
*
* - We find a point 'mi' between lo and hi (mi could be the same
* as lo, but never can be the same as hi), and check if it hits
* the target. There are three cases:
*
* - if it is a hit, we are happy.
*
* - if it is strictly higher than the target, we update hi with
* it.
*
* - if it is strictly lower than the target, we update lo to be
* one slot after it, because we allow lo to be at the target.
*
* When choosing 'mi', we do not have to take the "middle" but
* anywhere in between lo and hi, as long as lo <= mi < hi is
* satisfied. When we somehow know that the distance between the
* target and lo is much shorter than the target and hi, we could
* pick mi that is much closer to lo than the midway.
*/
/*
* The table should contain "nr" elements.
* The sha1 of element i (between 0 and nr - 1) should be returned
* by "fn(i, table)".
*/
int sha1_pos(const unsigned char *sha1, void *table, size_t nr,
sha1_access_fn fn)
{
size_t hi = nr;
size_t lo = 0;
size_t mi = 0;
if (!nr)
return -1;
if (nr != 1) {
size_t lov, hiv, miv, ofs;
for (ofs = 0; ofs < 18; ofs += 2) {
lov = take2(fn(0, table) + ofs);
hiv = take2(fn(nr - 1, table) + ofs);
miv = take2(sha1 + ofs);
if (miv < lov)
return -1;
if (hiv < miv)
return -1 - nr;
if (lov != hiv) {
/*
* At this point miv could be equal
* to hiv (but sha1 could still be higher);
* the invariant of (mi < hi) should be
* kept.
*/
mi = (nr - 1) * (miv - lov) / (hiv - lov);
if (lo <= mi && mi < hi)
break;
die("oops");
}
}
if (18 <= ofs)
die("cannot happen -- lo and hi are identical");
}
do {
int cmp;
cmp = hashcmp(fn(mi, table), sha1);
if (!cmp)
return mi;
if (cmp > 0)
hi = mi;
else
lo = mi + 1;
mi = (hi + lo) / 2;
} while (lo < hi);
return -lo-1;
}
/*
* Conventional binary search loop looks like this:
*

7
sha1-lookup.h
View File

@ -1,6 +1,13 @@
#ifndef SHA1_LOOKUP_H
#define SHA1_LOOKUP_H
typedef const unsigned char *sha1_access_fn(size_t index, void *table);
extern int sha1_pos(const unsigned char *sha1,
void *table,
size_t nr,
sha1_access_fn fn);
extern int sha1_entry_pos(const void *table,
size_t elem_size,
size_t key_offset,

60
t/t6030-bisect-porcelain.sh
View File

@ -506,6 +506,66 @@ test_expect_success 'optimized merge base checks' '
unset GIT_TRACE
'
# This creates another side branch called "parallel" with some files
# in some directories, to test bisecting with paths.
#
# We should have the following:
#
# P1-P2-P3-P4-P5-P6-P7
# / / /
# H1-H2-H3-H4-H5-H6-H7
# \ \ \
# S5-A \
# \ \
# S6-S7----B
#
test_expect_success '"parallel" side branch creation' '
git bisect reset &&
git checkout -b parallel $HASH1 &&
mkdir dir1 dir2 &&
add_line_into_file "1(para): line 1 on parallel branch" dir1/file1 &&
PARA_HASH1=$(git rev-parse --verify HEAD) &&
add_line_into_file "2(para): line 2 on parallel branch" dir2/file2 &&
PARA_HASH2=$(git rev-parse --verify HEAD) &&
add_line_into_file "3(para): line 3 on parallel branch" dir2/file3 &&
PARA_HASH3=$(git rev-parse --verify HEAD)
git merge -m "merge HASH4 and PARA_HASH3" "$HASH4" &&
PARA_HASH4=$(git rev-parse --verify HEAD)
add_line_into_file "5(para): add line on parallel branch" dir1/file1 &&
PARA_HASH5=$(git rev-parse --verify HEAD)
add_line_into_file "6(para): add line on parallel branch" dir2/file2 &&
PARA_HASH6=$(git rev-parse --verify HEAD)
git merge -m "merge HASH7 and PARA_HASH6" "$HASH7" &&
PARA_HASH7=$(git rev-parse --verify HEAD)
'
test_expect_success 'restricting bisection on one dir' '
git bisect reset &&
git bisect start HEAD $HASH1 -- dir1 &&
para1=$(git rev-parse --verify HEAD) &&
test "$para1" = "$PARA_HASH1" &&
git bisect bad > my_bisect_log.txt &&
grep "$PARA_HASH1 is first bad commit" my_bisect_log.txt
'
test_expect_success 'restricting bisection on one dir and a file' '
git bisect reset &&
git bisect start HEAD $HASH1 -- dir1 hello &&
para4=$(git rev-parse --verify HEAD) &&
test "$para4" = "$PARA_HASH4" &&
git bisect bad &&
hash3=$(git rev-parse --verify HEAD) &&
test "$hash3" = "$HASH3" &&
git bisect good &&
hash4=$(git rev-parse --verify HEAD) &&
test "$hash4" = "$HASH4" &&
git bisect good &&
para1=$(git rev-parse --verify HEAD) &&
test "$para1" = "$PARA_HASH1" &&
git bisect good > my_bisect_log.txt &&
grep "$PARA_HASH4 is first bad commit" my_bisect_log.txt
'
#
#
test_done

6
upload-pack.c
View File

@ -66,7 +66,7 @@ static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
}
static FILE *pack_pipe = NULL;
static void show_commit(struct commit *commit)
static void show_commit(struct commit *commit, void *data)
{
if (commit->object.flags & BOUNDARY)
fputc('-', pack_pipe);
@ -78,7 +78,7 @@ static void show_commit(struct commit *commit)
commit->buffer = NULL;
}
static void show_object(struct object_array_entry *p)
static void show_object(struct object_array_entry *p, void *data)
{
/* An object with name "foo\n0000000..." can be used to
* confuse downstream git-pack-objects very badly.
@ -134,7 +134,7 @@ static int do_rev_list(int fd, void *create_full_pack)
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
mark_edges_uninteresting(revs.commits, &revs, show_edge);
traverse_commit_list(&revs, show_commit, show_object);
traverse_commit_list(&revs, show_commit, show_object, NULL);
fflush(pack_pipe);
fclose(pack_pipe);
return 0;