mirror/ git
1
0
Fork 0
mirror of https://github.com/git/git.git synced 2024-04-27 10:35:08 +02:00
Code

blame: move scoreboard-related methods to libgit 

Signed-off-by: Jeff Smith <whydoubt@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Smith 2017-05-24 00:15:35 -05:00 committed by Junio C Hamano
parent 072bf4321f
commit b543bb1cdf
3 changed files with 1324 additions and 1318 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1313
blame.c
View File

@ -1,6 +1,9 @@
#include "cache.h"
#include "refs.h"
#include "cache-tree.h"
#include "mergesort.h"
#include "diff.h"
#include "diffcore.h"
#include "blame.h"
void blame_origin_decref(struct blame_origin *o)
@ -261,3 +264,1313 @@ struct commit *fake_working_tree_commit(struct diff_options *opt,
return commit;
}
static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b,
xdl_emit_hunk_consume_func_t hunk_func, void *cb_data, int xdl_opts)
{
xpparam_t xpp = {0};
xdemitconf_t xecfg = {0};
xdemitcb_t ecb = {NULL};
xpp.flags = xdl_opts;
xecfg.hunk_func = hunk_func;
ecb.priv = cb_data;
return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb);
}
/*
* Given an origin, prepare mmfile_t structure to be used by the
* diff machinery
*/
static void fill_origin_blob(struct diff_options *opt,
struct blame_origin *o, mmfile_t *file, int *num_read_blob)
{
if (!o->file.ptr) {
enum object_type type;
unsigned long file_size;
(*num_read_blob)++;
if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
textconv_object(o->path, o->mode, &o->blob_oid, 1, &file->ptr, &file_size))
;
else
file->ptr = read_sha1_file(o->blob_oid.hash, &type,
&file_size);
file->size = file_size;
if (!file->ptr)
die("Cannot read blob %s for path %s",
oid_to_hex(&o->blob_oid),
o->path);
o->file = *file;
}
else
*file = o->file;
}
static void drop_origin_blob(struct blame_origin *o)
{
if (o->file.ptr) {
free(o->file.ptr);
o->file.ptr = NULL;
}
}
/*
* Any merge of blames happens on lists of blames that arrived via
* different parents in a single suspect. In this case, we want to
* sort according to the suspect line numbers as opposed to the final
* image line numbers. The function body is somewhat longish because
* it avoids unnecessary writes.
*/
static struct blame_entry *blame_merge(struct blame_entry *list1,
struct blame_entry *list2)
{
struct blame_entry *p1 = list1, *p2 = list2,
**tail = &list1;
if (!p1)
return p2;
if (!p2)
return p1;
if (p1->s_lno <= p2->s_lno) {
do {
tail = &p1->next;
if ((p1 = *tail) == NULL) {
*tail = p2;
return list1;
}
} while (p1->s_lno <= p2->s_lno);
}
for (;;) {
*tail = p2;
do {
tail = &p2->next;
if ((p2 = *tail) == NULL) {
*tail = p1;
return list1;
}
} while (p1->s_lno > p2->s_lno);
*tail = p1;
do {
tail = &p1->next;
if ((p1 = *tail) == NULL) {
*tail = p2;
return list1;
}
} while (p1->s_lno <= p2->s_lno);
}
}
static void *get_next_blame(const void *p)
{
return ((struct blame_entry *)p)->next;
}
static void set_next_blame(void *p1, void *p2)
{
((struct blame_entry *)p1)->next = p2;
}
/*
* Final image line numbers are all different, so we don't need a
* three-way comparison here.
*/
static int compare_blame_final(const void *p1, const void *p2)
{
return ((struct blame_entry *)p1)->lno > ((struct blame_entry *)p2)->lno
? 1 : -1;
}
static int compare_blame_suspect(const void *p1, const void *p2)
{
const struct blame_entry *s1 = p1, *s2 = p2;
/*
* to allow for collating suspects, we sort according to the
* respective pointer value as the primary sorting criterion.
* The actual relation is pretty unimportant as long as it
* establishes a total order. Comparing as integers gives us
* that.
*/
if (s1->suspect != s2->suspect)
return (intptr_t)s1->suspect > (intptr_t)s2->suspect ? 1 : -1;
if (s1->s_lno == s2->s_lno)
return 0;
return s1->s_lno > s2->s_lno ? 1 : -1;
}
void blame_sort_final(struct blame_scoreboard *sb)
{
sb->ent = llist_mergesort(sb->ent, get_next_blame, set_next_blame,
compare_blame_final);
}
/*
* For debugging -- origin is refcounted, and this asserts that
* we do not underflow.
*/
static void sanity_check_refcnt(struct blame_scoreboard *sb)
{
int baa = 0;
struct blame_entry *ent;
for (ent = sb->ent; ent; ent = ent->next) {
/* Nobody should have zero or negative refcnt */
if (ent->suspect->refcnt <= 0) {
fprintf(stderr, "%s in %s has negative refcnt %d\n",
ent->suspect->path,
oid_to_hex(&ent->suspect->commit->object.oid),
ent->suspect->refcnt);
baa = 1;
}
}
if (baa)
sb->on_sanity_fail(sb, baa);
}
/*
* If two blame entries that are next to each other came from
* contiguous lines in the same origin (i.e. <commit, path> pair),
* merge them together.
*/
void blame_coalesce(struct blame_scoreboard *sb)
{
struct blame_entry *ent, *next;
for (ent = sb->ent; ent && (next = ent->next); ent = next) {
if (ent->suspect == next->suspect &&
ent->s_lno + ent->num_lines == next->s_lno) {
ent->num_lines += next->num_lines;
ent->next = next->next;
blame_origin_decref(next->suspect);
free(next);
ent->score = 0;
next = ent; /* again */
}
}
if (sb->debug) /* sanity */
sanity_check_refcnt(sb);
}
/*
* Merge the given sorted list of blames into a preexisting origin.
* If there were no previous blames to that commit, it is entered into
* the commit priority queue of the score board.
*/
static void queue_blames(struct blame_scoreboard *sb, struct blame_origin *porigin,
struct blame_entry *sorted)
{
if (porigin->suspects)
porigin->suspects = blame_merge(porigin->suspects, sorted);
else {
struct blame_origin *o;
for (o = porigin->commit->util; o; o = o->next) {
if (o->suspects) {
porigin->suspects = sorted;
return;
}
}
porigin->suspects = sorted;
prio_queue_put(&sb->commits, porigin->commit);
}
}
/*
* We have an origin -- check if the same path exists in the
* parent and return an origin structure to represent it.
*/
static struct blame_origin *find_origin(struct commit *parent,
struct blame_origin *origin)
{
struct blame_origin *porigin;
struct diff_options diff_opts;
const char *paths[2];
/* First check any existing origins */
for (porigin = parent->util; porigin; porigin = porigin->next)
if (!strcmp(porigin->path, origin->path)) {
/*
* The same path between origin and its parent
* without renaming -- the most common case.
*/
return blame_origin_incref (porigin);
}
/* See if the origin->path is different between parent
* and origin first. Most of the time they are the
* same and diff-tree is fairly efficient about this.
*/
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.detect_rename = 0;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
paths[0] = origin->path;
paths[1] = NULL;
parse_pathspec(&diff_opts.pathspec,
PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL,
PATHSPEC_LITERAL_PATH, "", paths);
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
origin->commit->tree->object.oid.hash,
"", &diff_opts);
diffcore_std(&diff_opts);
if (!diff_queued_diff.nr) {
/* The path is the same as parent */
porigin = get_origin(parent, origin->path);
oidcpy(&porigin->blob_oid, &origin->blob_oid);
porigin->mode = origin->mode;
} else {
/*
* Since origin->path is a pathspec, if the parent
* commit had it as a directory, we will see a whole
* bunch of deletion of files in the directory that we
* do not care about.
*/
int i;
struct diff_filepair *p = NULL;
for (i = 0; i < diff_queued_diff.nr; i++) {
const char *name;
p = diff_queued_diff.queue[i];
name = p->one->path ? p->one->path : p->two->path;
if (!strcmp(name, origin->path))
break;
}
if (!p)
die("internal error in blame::find_origin");
switch (p->status) {
default:
die("internal error in blame::find_origin (%c)",
p->status);
case 'M':
porigin = get_origin(parent, origin->path);
oidcpy(&porigin->blob_oid, &p->one->oid);
porigin->mode = p->one->mode;
break;
case 'A':
case 'T':
/* Did not exist in parent, or type changed */
break;
}
}
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
return porigin;
}
/*
* We have an origin -- find the path that corresponds to it in its
* parent and return an origin structure to represent it.
*/
static struct blame_origin *find_rename(struct commit *parent,
struct blame_origin *origin)
{
struct blame_origin *porigin = NULL;
struct diff_options diff_opts;
int i;
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.detect_rename = DIFF_DETECT_RENAME;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_opts.single_follow = origin->path;
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
origin->commit->tree->object.oid.hash,
"", &diff_opts);
diffcore_std(&diff_opts);
for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
if ((p->status == 'R' || p->status == 'C') &&
!strcmp(p->two->path, origin->path)) {
porigin = get_origin(parent, p->one->path);
oidcpy(&porigin->blob_oid, &p->one->oid);
porigin->mode = p->one->mode;
break;
}
}
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
return porigin;
}
/*
* Append a new blame entry to a given output queue.
*/
static void add_blame_entry(struct blame_entry ***queue,
const struct blame_entry *src)
{
struct blame_entry *e = xmalloc(sizeof(*e));
memcpy(e, src, sizeof(*e));
blame_origin_incref(e->suspect);
e->next = **queue;
**queue = e;
*queue = &e->next;
}
/*
* src typically is on-stack; we want to copy the information in it to
* a malloced blame_entry that gets added to the given queue. The
* origin of dst loses a refcnt.
*/
static void dup_entry(struct blame_entry ***queue,
struct blame_entry *dst, struct blame_entry *src)
{
blame_origin_incref(src->suspect);
blame_origin_decref(dst->suspect);
memcpy(dst, src, sizeof(*src));
dst->next = **queue;
**queue = dst;
*queue = &dst->next;
}
const char *blame_nth_line(struct blame_scoreboard *sb, long lno)
{
return sb->final_buf + sb->lineno[lno];
}
/*
* It is known that lines between tlno to same came from parent, and e
* has an overlap with that range. it also is known that parent's
* line plno corresponds to e's line tlno.
*
* <---- e ----->
* <------>
* <------------>
* <------------>
* <------------------>
*
* Split e into potentially three parts; before this chunk, the chunk
* to be blamed for the parent, and after that portion.
*/
static void split_overlap(struct blame_entry *split,
struct blame_entry *e,
int tlno, int plno, int same,
struct blame_origin *parent)
{
int chunk_end_lno;
memset(split, 0, sizeof(struct blame_entry [3]));
if (e->s_lno < tlno) {
/* there is a pre-chunk part not blamed on parent */
split[0].suspect = blame_origin_incref(e->suspect);
split[0].lno = e->lno;
split[0].s_lno = e->s_lno;
split[0].num_lines = tlno - e->s_lno;
split[1].lno = e->lno + tlno - e->s_lno;
split[1].s_lno = plno;
}
else {
split[1].lno = e->lno;
split[1].s_lno = plno + (e->s_lno - tlno);
}
if (same < e->s_lno + e->num_lines) {
/* there is a post-chunk part not blamed on parent */
split[2].suspect = blame_origin_incref(e->suspect);
split[2].lno = e->lno + (same - e->s_lno);
split[2].s_lno = e->s_lno + (same - e->s_lno);
split[2].num_lines = e->s_lno + e->num_lines - same;
chunk_end_lno = split[2].lno;
}
else
chunk_end_lno = e->lno + e->num_lines;
split[1].num_lines = chunk_end_lno - split[1].lno;
/*
* if it turns out there is nothing to blame the parent for,
* forget about the splitting. !split[1].suspect signals this.
*/
if (split[1].num_lines < 1)
return;
split[1].suspect = blame_origin_incref(parent);
}
/*
* split_overlap() divided an existing blame e into up to three parts
* in split. Any assigned blame is moved to queue to
* reflect the split.
*/
static void split_blame(struct blame_entry ***blamed,
struct blame_entry ***unblamed,
struct blame_entry *split,
struct blame_entry *e)
{
if (split[0].suspect && split[2].suspect) {
/* The first part (reuse storage for the existing entry e) */
dup_entry(unblamed, e, &split[0]);
/* The last part -- me */
add_blame_entry(unblamed, &split[2]);
/* ... and the middle part -- parent */
add_blame_entry(blamed, &split[1]);
}
else if (!split[0].suspect && !split[2].suspect)
/*
* The parent covers the entire area; reuse storage for
* e and replace it with the parent.
*/
dup_entry(blamed, e, &split[1]);
else if (split[0].suspect) {
/* me and then parent */
dup_entry(unblamed, e, &split[0]);
add_blame_entry(blamed, &split[1]);
}
else {
/* parent and then me */
dup_entry(blamed, e, &split[1]);
add_blame_entry(unblamed, &split[2]);
}
}
/*
* After splitting the blame, the origins used by the
* on-stack blame_entry should lose one refcnt each.
*/
static void decref_split(struct blame_entry *split)
{
int i;
for (i = 0; i < 3; i++)
blame_origin_decref(split[i].suspect);
}
/*
* reverse_blame reverses the list given in head, appending tail.
* That allows us to build lists in reverse order, then reverse them
* afterwards. This can be faster than building the list in proper
* order right away. The reason is that building in proper order
* requires writing a link in the _previous_ element, while building
* in reverse order just requires placing the list head into the
* _current_ element.
*/
static struct blame_entry *reverse_blame(struct blame_entry *head,
struct blame_entry *tail)
{
while (head) {
struct blame_entry *next = head->next;
head->next = tail;
tail = head;
head = next;
}
return tail;
}
/*
* Process one hunk from the patch between the current suspect for
* blame_entry e and its parent. This first blames any unfinished
* entries before the chunk (which is where target and parent start
* differing) on the parent, and then splits blame entries at the
* start and at the end of the difference region. Since use of -M and
* -C options may lead to overlapping/duplicate source line number
* ranges, all we can rely on from sorting/merging is the order of the
* first suspect line number.
*/
static void blame_chunk(struct blame_entry ***dstq, struct blame_entry ***srcq,
int tlno, int offset, int same,
struct blame_origin *parent)
{
struct blame_entry *e = **srcq;
struct blame_entry *samep = NULL, *diffp = NULL;
while (e && e->s_lno < tlno) {
struct blame_entry *next = e->next;
/*
* current record starts before differing portion. If
* it reaches into it, we need to split it up and
* examine the second part separately.
*/
if (e->s_lno + e->num_lines > tlno) {
/* Move second half to a new record */
int len = tlno - e->s_lno;
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
n->suspect = e->suspect;
n->lno = e->lno + len;
n->s_lno = e->s_lno + len;
n->num_lines = e->num_lines - len;
e->num_lines = len;
e->score = 0;
/* Push new record to diffp */
n->next = diffp;
diffp = n;
} else
blame_origin_decref(e->suspect);
/* Pass blame for everything before the differing
* chunk to the parent */
e->suspect = blame_origin_incref(parent);
e->s_lno += offset;
e->next = samep;
samep = e;
e = next;
}
/*
* As we don't know how much of a common stretch after this
* diff will occur, the currently blamed parts are all that we
* can assign to the parent for now.
*/
if (samep) {
**dstq = reverse_blame(samep, **dstq);
*dstq = &samep->next;
}
/*
* Prepend the split off portions: everything after e starts
* after the blameable portion.
*/
e = reverse_blame(diffp, e);
/*
* Now retain records on the target while parts are different
* from the parent.
*/
samep = NULL;
diffp = NULL;
while (e && e->s_lno < same) {
struct blame_entry *next = e->next;
/*
* If current record extends into sameness, need to split.
*/
if (e->s_lno + e->num_lines > same) {
/*
* Move second half to a new record to be
* processed by later chunks
*/
int len = same - e->s_lno;
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
n->suspect = blame_origin_incref(e->suspect);
n->lno = e->lno + len;
n->s_lno = e->s_lno + len;
n->num_lines = e->num_lines - len;
e->num_lines = len;
e->score = 0;
/* Push new record to samep */
n->next = samep;
samep = n;
}
e->next = diffp;
diffp = e;
e = next;
}
**srcq = reverse_blame(diffp, reverse_blame(samep, e));
/* Move across elements that are in the unblamable portion */
if (diffp)
*srcq = &diffp->next;
}
struct blame_chunk_cb_data {
struct blame_origin *parent;
long offset;
struct blame_entry **dstq;
struct blame_entry **srcq;
};
/* diff chunks are from parent to target */
static int blame_chunk_cb(long start_a, long count_a,
long start_b, long count_b, void *data)
{
struct blame_chunk_cb_data *d = data;
if (start_a - start_b != d->offset)
die("internal error in blame::blame_chunk_cb");
blame_chunk(&d->dstq, &d->srcq, start_b, start_a - start_b,
start_b + count_b, d->parent);
d->offset = start_a + count_a - (start_b + count_b);
return 0;
}
/*
* We are looking at the origin 'target' and aiming to pass blame
* for the lines it is suspected to its parent. Run diff to find
* which lines came from parent and pass blame for them.
*/
static void pass_blame_to_parent(struct blame_scoreboard *sb,
struct blame_origin *target,
struct blame_origin *parent)
{
mmfile_t file_p, file_o;
struct blame_chunk_cb_data d;
struct blame_entry *newdest = NULL;
if (!target->suspects)
return; /* nothing remains for this target */
d.parent = parent;
d.offset = 0;
d.dstq = &newdest; d.srcq = &target->suspects;
fill_origin_blob(&sb->revs->diffopt, parent, &file_p, &sb->num_read_blob);
fill_origin_blob(&sb->revs->diffopt, target, &file_o, &sb->num_read_blob);
sb->num_get_patch++;
if (diff_hunks(&file_p, &file_o, blame_chunk_cb, &d, sb->xdl_opts))
die("unable to generate diff (%s -> %s)",
oid_to_hex(&parent->commit->object.oid),
oid_to_hex(&target->commit->object.oid));
/* The rest are the same as the parent */
blame_chunk(&d.dstq, &d.srcq, INT_MAX, d.offset, INT_MAX, parent);
*d.dstq = NULL;
queue_blames(sb, parent, newdest);
return;
}
/*
* The lines in blame_entry after splitting blames many times can become
* very small and trivial, and at some point it becomes pointless to
* blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
* ordinary C program, and it is not worth to say it was copied from
* totally unrelated file in the parent.
*
* Compute how trivial the lines in the blame_entry are.
*/
unsigned blame_entry_score(struct blame_scoreboard *sb, struct blame_entry *e)
{
unsigned score;
const char *cp, *ep;
if (e->score)
return e->score;
score = 1;
cp = blame_nth_line(sb, e->lno);
ep = blame_nth_line(sb, e->lno + e->num_lines);
while (cp < ep) {
unsigned ch = *((unsigned char *)cp);
if (isalnum(ch))
score++;
cp++;
}
e->score = score;
return score;
}
/*
* best_so_far[] and this[] are both a split of an existing blame_entry
* that passes blame to the parent. Maintain best_so_far the best split
* so far, by comparing this and best_so_far and copying this into
* bst_so_far as needed.
*/
static void copy_split_if_better(struct blame_scoreboard *sb,
struct blame_entry *best_so_far,
struct blame_entry *this)
{
int i;
if (!this[1].suspect)
return;
if (best_so_far[1].suspect) {
if (blame_entry_score(sb, &this[1]) < blame_entry_score(sb, &best_so_far[1]))
return;
}
for (i = 0; i < 3; i++)
blame_origin_incref(this[i].suspect);
decref_split(best_so_far);
memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
}
/*
* We are looking at a part of the final image represented by
* ent (tlno and same are offset by ent->s_lno).
* tlno is where we are looking at in the final image.
* up to (but not including) same match preimage.
* plno is where we are looking at in the preimage.
*
* <-------------- final image ---------------------->
* <------ent------>
* ^tlno ^same
* <---------preimage----->
* ^plno
*
* All line numbers are 0-based.
*/
static void handle_split(struct blame_scoreboard *sb,
struct blame_entry *ent,
int tlno, int plno, int same,
struct blame_origin *parent,
struct blame_entry *split)
{
if (ent->num_lines <= tlno)
return;
if (tlno < same) {
struct blame_entry this[3];
tlno += ent->s_lno;
same += ent->s_lno;
split_overlap(this, ent, tlno, plno, same, parent);
copy_split_if_better(sb, split, this);
decref_split(this);
}
}
struct handle_split_cb_data {
struct blame_scoreboard *sb;
struct blame_entry *ent;
struct blame_origin *parent;
struct blame_entry *split;
long plno;
long tlno;
};
static int handle_split_cb(long start_a, long count_a,
long start_b, long count_b, void *data)
{
struct handle_split_cb_data *d = data;
handle_split(d->sb, d->ent, d->tlno, d->plno, start_b, d->parent,
d->split);
d->plno = start_a + count_a;
d->tlno = start_b + count_b;
return 0;
}
/*
* Find the lines from parent that are the same as ent so that
* we can pass blames to it. file_p has the blob contents for
* the parent.
*/
static void find_copy_in_blob(struct blame_scoreboard *sb,
struct blame_entry *ent,
struct blame_origin *parent,
struct blame_entry *split,
mmfile_t *file_p)
{
const char *cp;
mmfile_t file_o;
struct handle_split_cb_data d;
memset(&d, 0, sizeof(d));
d.sb = sb; d.ent = ent; d.parent = parent; d.split = split;
/*
* Prepare mmfile that contains only the lines in ent.
*/
cp = blame_nth_line(sb, ent->lno);
file_o.ptr = (char *) cp;
file_o.size = blame_nth_line(sb, ent->lno + ent->num_lines) - cp;
/*
* file_o is a part of final image we are annotating.
* file_p partially may match that image.
*/
memset(split, 0, sizeof(struct blame_entry [3]));
if (diff_hunks(file_p, &file_o, handle_split_cb, &d, sb->xdl_opts))
die("unable to generate diff (%s)",
oid_to_hex(&parent->commit->object.oid));
/* remainder, if any, all match the preimage */
handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split);
}
/* Move all blame entries from list *source that have a score smaller
* than score_min to the front of list *small.
* Returns a pointer to the link pointing to the old head of the small list.
*/
static struct blame_entry **filter_small(struct blame_scoreboard *sb,
struct blame_entry **small,
struct blame_entry **source,
unsigned score_min)
{
struct blame_entry *p = *source;
struct blame_entry *oldsmall = *small;
while (p) {
if (blame_entry_score(sb, p) <= score_min) {
*small = p;
small = &p->next;
p = *small;
} else {
*source = p;
source = &p->next;
p = *source;
}
}
*small = oldsmall;
*source = NULL;
return small;
}
/*
* See if lines currently target is suspected for can be attributed to
* parent.
*/
static void find_move_in_parent(struct blame_scoreboard *sb,
struct blame_entry ***blamed,
struct blame_entry **toosmall,
struct blame_origin *target,
struct blame_origin *parent)
{
struct blame_entry *e, split[3];
struct blame_entry *unblamed = target->suspects;
struct blame_entry *leftover = NULL;
mmfile_t file_p;
if (!unblamed)
return; /* nothing remains for this target */
fill_origin_blob(&sb->revs->diffopt, parent, &file_p, &sb->num_read_blob);
if (!file_p.ptr)
return;
/* At each iteration, unblamed has a NULL-terminated list of
* entries that have not yet been tested for blame. leftover
* contains the reversed list of entries that have been tested
* without being assignable to the parent.
*/
do {
struct blame_entry **unblamedtail = &unblamed;
struct blame_entry *next;
for (e = unblamed; e; e = next) {
next = e->next;
find_copy_in_blob(sb, e, parent, split, &file_p);
if (split[1].suspect &&
sb->move_score < blame_entry_score(sb, &split[1])) {
split_blame(blamed, &unblamedtail, split, e);
} else {
e->next = leftover;
leftover = e;
}
decref_split(split);
}
*unblamedtail = NULL;
toosmall = filter_small(sb, toosmall, &unblamed, sb->move_score);
} while (unblamed);
target->suspects = reverse_blame(leftover, NULL);
}
struct blame_list {
struct blame_entry *ent;
struct blame_entry split[3];
};
/*
* Count the number of entries the target is suspected for,
* and prepare a list of entry and the best split.
*/
static struct blame_list *setup_blame_list(struct blame_entry *unblamed,
int *num_ents_p)
{
struct blame_entry *e;
int num_ents, i;
struct blame_list *blame_list = NULL;
for (e = unblamed, num_ents = 0; e; e = e->next)
num_ents++;
if (num_ents) {
blame_list = xcalloc(num_ents, sizeof(struct blame_list));
for (e = unblamed, i = 0; e; e = e->next)
blame_list[i++].ent = e;
}
*num_ents_p = num_ents;
return blame_list;
}
/*
* For lines target is suspected for, see if we can find code movement
* across file boundary from the parent commit. porigin is the path
* in the parent we already tried.
*/
static void find_copy_in_parent(struct blame_scoreboard *sb,
struct blame_entry ***blamed,
struct blame_entry **toosmall,
struct blame_origin *target,
struct commit *parent,
struct blame_origin *porigin,
int opt)
{
struct diff_options diff_opts;
int i, j;
struct blame_list *blame_list;
int num_ents;
struct blame_entry *unblamed = target->suspects;
struct blame_entry *leftover = NULL;
if (!unblamed)
return; /* nothing remains for this target */
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&diff_opts);
/* Try "find copies harder" on new path if requested;
* we do not want to use diffcore_rename() actually to
* match things up; find_copies_harder is set only to
* force diff_tree_sha1() to feed all filepairs to diff_queue,
* and this code needs to be after diff_setup_done(), which
* usually makes find-copies-harder imply copy detection.
*/
if ((opt & PICKAXE_BLAME_COPY_HARDEST)
|| ((opt & PICKAXE_BLAME_COPY_HARDER)
&& (!porigin || strcmp(target->path, porigin->path))))
DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
if (is_null_oid(&target->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
target->commit->tree->object.oid.hash,
"", &diff_opts);
if (!DIFF_OPT_TST(&diff_opts, FIND_COPIES_HARDER))
diffcore_std(&diff_opts);
do {
struct blame_entry **unblamedtail = &unblamed;
blame_list = setup_blame_list(unblamed, &num_ents);
for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
struct blame_origin *norigin;
mmfile_t file_p;
struct blame_entry this[3];
if (!DIFF_FILE_VALID(p->one))
continue; /* does not exist in parent */
if (S_ISGITLINK(p->one->mode))
continue; /* ignore git links */
if (porigin && !strcmp(p->one->path, porigin->path))
/* find_move already dealt with this path */
continue;
norigin = get_origin(parent, p->one->path);
oidcpy(&norigin->blob_oid, &p->one->oid);
norigin->mode = p->one->mode;
fill_origin_blob(&sb->revs->diffopt, norigin, &file_p, &sb->num_read_blob);
if (!file_p.ptr)
continue;
for (j = 0; j < num_ents; j++) {
find_copy_in_blob(sb, blame_list[j].ent,
norigin, this, &file_p);
copy_split_if_better(sb, blame_list[j].split,
this);
decref_split(this);
}
blame_origin_decref(norigin);
}
for (j = 0; j < num_ents; j++) {
struct blame_entry *split = blame_list[j].split;
if (split[1].suspect &&
sb->copy_score < blame_entry_score(sb, &split[1])) {
split_blame(blamed, &unblamedtail, split,
blame_list[j].ent);
} else {
blame_list[j].ent->next = leftover;
leftover = blame_list[j].ent;
}
decref_split(split);
}
free(blame_list);
*unblamedtail = NULL;
toosmall = filter_small(sb, toosmall, &unblamed, sb->copy_score);
} while (unblamed);
target->suspects = reverse_blame(leftover, NULL);
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
}
/*
* The blobs of origin and porigin exactly match, so everything
* origin is suspected for can be blamed on the parent.
*/
static void pass_whole_blame(struct blame_scoreboard *sb,
struct blame_origin *origin, struct blame_origin *porigin)
{
struct blame_entry *e, *suspects;
if (!porigin->file.ptr && origin->file.ptr) {
/* Steal its file */
porigin->file = origin->file;
origin->file.ptr = NULL;
}
suspects = origin->suspects;
origin->suspects = NULL;
for (e = suspects; e; e = e->next) {
blame_origin_incref(porigin);
blame_origin_decref(e->suspect);
e->suspect = porigin;
}
queue_blames(sb, porigin, suspects);
}
/*
* We pass blame from the current commit to its parents. We keep saying
* "parent" (and "porigin"), but what we mean is to find scapegoat to
* exonerate ourselves.
*/
static struct commit_list *first_scapegoat(struct rev_info *revs, struct commit *commit,
int reverse)
{
if (!reverse) {
if (revs->first_parent_only &&
commit->parents &&
commit->parents->next) {
free_commit_list(commit->parents->next);
commit->parents->next = NULL;
}
return commit->parents;
}
return lookup_decoration(&revs->children, &commit->object);
}
static int num_scapegoats(struct rev_info *revs, struct commit *commit, int reverse)
{
struct commit_list *l = first_scapegoat(revs, commit, reverse);
return commit_list_count(l);
}
/* Distribute collected unsorted blames to the respected sorted lists
* in the various origins.
*/
static void distribute_blame(struct blame_scoreboard *sb, struct blame_entry *blamed)
{
blamed = llist_mergesort(blamed, get_next_blame, set_next_blame,
compare_blame_suspect);
while (blamed)
{
struct blame_origin *porigin = blamed->suspect;
struct blame_entry *suspects = NULL;
do {
struct blame_entry *next = blamed->next;
blamed->next = suspects;
suspects = blamed;
blamed = next;
} while (blamed && blamed->suspect == porigin);
suspects = reverse_blame(suspects, NULL);
queue_blames(sb, porigin, suspects);
}
}
#define MAXSG 16
static void pass_blame(struct blame_scoreboard *sb, struct blame_origin *origin, int opt)
{
struct rev_info *revs = sb->revs;
int i, pass, num_sg;
struct commit *commit = origin->commit;
struct commit_list *sg;
struct blame_origin *sg_buf[MAXSG];
struct blame_origin *porigin, **sg_origin = sg_buf;
struct blame_entry *toosmall = NULL;
struct blame_entry *blames, **blametail = &blames;
num_sg = num_scapegoats(revs, commit, sb->reverse);
if (!num_sg)
goto finish;
else if (num_sg < ARRAY_SIZE(sg_buf))
memset(sg_buf, 0, sizeof(sg_buf));
else
sg_origin = xcalloc(num_sg, sizeof(*sg_origin));
/*
* The first pass looks for unrenamed path to optimize for
* common cases, then we look for renames in the second pass.
*/
for (pass = 0; pass < 2 - sb->no_whole_file_rename; pass++) {
struct blame_origin *(*find)(struct commit *, struct blame_origin *);
find = pass ? find_rename : find_origin;
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct commit *p = sg->item;
int j, same;
if (sg_origin[i])
continue;
if (parse_commit(p))
continue;
porigin = find(p, origin);
if (!porigin)
continue;
if (!oidcmp(&porigin->blob_oid, &origin->blob_oid)) {
pass_whole_blame(sb, origin, porigin);
blame_origin_decref(porigin);
goto finish;
}
for (j = same = 0; j < i; j++)
if (sg_origin[j] &&
!oidcmp(&sg_origin[j]->blob_oid, &porigin->blob_oid)) {
same = 1;
break;
}
if (!same)
sg_origin[i] = porigin;
else
blame_origin_decref(porigin);
}
}
sb->num_commits++;
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct blame_origin *porigin = sg_origin[i];
if (!porigin)
continue;
if (!origin->previous) {
blame_origin_incref(porigin);
origin->previous = porigin;
}
pass_blame_to_parent(sb, origin, porigin);
if (!origin->suspects)
goto finish;
}
/*
* Optionally find moves in parents' files.
*/
if (opt & PICKAXE_BLAME_MOVE) {
filter_small(sb, &toosmall, &origin->suspects, sb->move_score);
if (origin->suspects) {
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct blame_origin *porigin = sg_origin[i];
if (!porigin)
continue;
find_move_in_parent(sb, &blametail, &toosmall, origin, porigin);
if (!origin->suspects)
break;
}
}
}
/*
* Optionally find copies from parents' files.
*/
if (opt & PICKAXE_BLAME_COPY) {
if (sb->copy_score > sb->move_score)
filter_small(sb, &toosmall, &origin->suspects, sb->copy_score);
else if (sb->copy_score < sb->move_score) {
origin->suspects = blame_merge(origin->suspects, toosmall);
toosmall = NULL;
filter_small(sb, &toosmall, &origin->suspects, sb->copy_score);
}
if (!origin->suspects)
goto finish;
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct blame_origin *porigin = sg_origin[i];
find_copy_in_parent(sb, &blametail, &toosmall,
origin, sg->item, porigin, opt);
if (!origin->suspects)
goto finish;
}
}
finish:
*blametail = NULL;
distribute_blame(sb, blames);
/*
* prepend toosmall to origin->suspects
*
* There is no point in sorting: this ends up on a big
* unsorted list in the caller anyway.
*/
if (toosmall) {
struct blame_entry **tail = &toosmall;
while (*tail)
tail = &(*tail)->next;
*tail = origin->suspects;
origin->suspects = toosmall;
}
for (i = 0; i < num_sg; i++) {
if (sg_origin[i]) {
drop_origin_blob(sg_origin[i]);
blame_origin_decref(sg_origin[i]);
}
}
drop_origin_blob(origin);
if (sg_buf != sg_origin)
free(sg_origin);
}
/*
* The main loop -- while we have blobs with lines whose true origin
* is still unknown, pick one blob, and allow its lines to pass blames
* to its parents. */
void assign_blame(struct blame_scoreboard *sb, int opt)
{
struct rev_info *revs = sb->revs;
struct commit *commit = prio_queue_get(&sb->commits);
while (commit) {
struct blame_entry *ent;
struct blame_origin *suspect = commit->util;
/* find one suspect to break down */
while (suspect && !suspect->suspects)
suspect = suspect->next;
if (!suspect) {
commit = prio_queue_get(&sb->commits);
continue;
}
assert(commit == suspect->commit);
/*
* We will use this suspect later in the loop,
* so hold onto it in the meantime.
*/
blame_origin_incref(suspect);
parse_commit(commit);
if (sb->reverse ||
(!(commit->object.flags & UNINTERESTING) &&
!(revs->max_age != -1 && commit->date < revs->max_age)))
pass_blame(sb, suspect, opt);
else {
commit->object.flags |= UNINTERESTING;
if (commit->object.parsed)
mark_parents_uninteresting(commit);
}
/* treat root commit as boundary */
if (!commit->parents && !sb->show_root)
commit->object.flags |= UNINTERESTING;
/* Take responsibility for the remaining entries */
ent = suspect->suspects;
if (ent) {
suspect->guilty = 1;
for (;;) {
struct blame_entry *next = ent->next;
if (sb->found_guilty_entry)
sb->found_guilty_entry(ent, sb->found_guilty_entry_data);
if (next) {
ent = next;
continue;
}
ent->next = sb->ent;
sb->ent = suspect->suspects;
suspect->suspects = NULL;
break;
}
}
blame_origin_decref(suspect);
if (sb->debug) /* sanity */
sanity_check_refcnt(sb);
}
}

11
blame.h
View File

@ -8,6 +8,11 @@
#include "prio-queue.h"
#include "diff.h"
#define PICKAXE_BLAME_MOVE 01
#define PICKAXE_BLAME_COPY 02
#define PICKAXE_BLAME_COPY_HARDER 04
#define PICKAXE_BLAME_COPY_HARDEST 010
/*
* One blob in a commit that is being suspected
*/
@ -157,4 +162,10 @@ extern struct blame_origin *get_origin(struct commit *commit, const char *path);
extern struct commit *fake_working_tree_commit(struct diff_options *opt, const char *path, const char *contents_from);
extern void blame_coalesce(struct blame_scoreboard *sb);
extern void blame_sort_final(struct blame_scoreboard *sb);
extern unsigned blame_entry_score(struct blame_scoreboard *sb, struct blame_entry *e);
extern void assign_blame(struct blame_scoreboard *sb, int opt);
extern const char *blame_nth_line(struct blame_scoreboard *sb, long lno);
#endif /* BLAME_H */

1318
builtin/blame.c
View File

@ -12,13 +12,10 @@
#include "tag.h"
#include "tree-walk.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "quote.h"
#include "xdiff-interface.h"
#include "string-list.h"
#include "mailmap.h"
#include "mergesort.h"
#include "parse-options.h"
#include "prio-queue.h"
#include "utf8.h"
@ -61,11 +58,6 @@ static struct string_list mailmap = STRING_LIST_INIT_NODUP;
#define DEBUG 0
#endif
#define PICKAXE_BLAME_MOVE 01
#define PICKAXE_BLAME_COPY 02
#define PICKAXE_BLAME_COPY_HARDER 04
#define PICKAXE_BLAME_COPY_HARDEST 010
static unsigned blame_move_score;
static unsigned blame_copy_score;
#define BLAME_DEFAULT_MOVE_SCORE 20
@ -80,143 +72,6 @@ struct progress_info {
int blamed_lines;
};
static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b,
xdl_emit_hunk_consume_func_t hunk_func, void *cb_data, int xdl_opts)
{
xpparam_t xpp = {0};
xdemitconf_t xecfg = {0};
xdemitcb_t ecb = {NULL};
xpp.flags = xdl_opts;
xecfg.hunk_func = hunk_func;
ecb.priv = cb_data;
return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb);
}
/*
* Given an origin, prepare mmfile_t structure to be used by the
* diff machinery
*/
static void fill_origin_blob(struct diff_options *opt,
struct blame_origin *o, mmfile_t *file, int *num_read_blob)
{
if (!o->file.ptr) {
enum object_type type;
unsigned long file_size;
(*num_read_blob)++;
if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
textconv_object(o->path, o->mode, &o->blob_oid, 1, &file->ptr, &file_size))
;
else
file->ptr = read_sha1_file(o->blob_oid.hash, &type,
&file_size);
file->size = file_size;
if (!file->ptr)
die("Cannot read blob %s for path %s",
oid_to_hex(&o->blob_oid),
o->path);
o->file = *file;
}
else
*file = o->file;
}
static void drop_origin_blob(struct blame_origin *o)
{
if (o->file.ptr) {
free(o->file.ptr);
o->file.ptr = NULL;
}
}
/*
* Any merge of blames happens on lists of blames that arrived via
* different parents in a single suspect. In this case, we want to
* sort according to the suspect line numbers as opposed to the final
* image line numbers. The function body is somewhat longish because
* it avoids unnecessary writes.
*/
static struct blame_entry *blame_merge(struct blame_entry *list1,
struct blame_entry *list2)
{
struct blame_entry *p1 = list1, *p2 = list2,
**tail = &list1;
if (!p1)
return p2;
if (!p2)
return p1;
if (p1->s_lno <= p2->s_lno) {
do {
tail = &p1->next;
if ((p1 = *tail) == NULL) {
*tail = p2;
return list1;
}
} while (p1->s_lno <= p2->s_lno);
}
for (;;) {
*tail = p2;
do {
tail = &p2->next;
if ((p2 = *tail) == NULL) {
*tail = p1;
return list1;
}
} while (p1->s_lno > p2->s_lno);
*tail = p1;
do {
tail = &p1->next;
if ((p1 = *tail) == NULL) {
*tail = p2;
return list1;
}
} while (p1->s_lno <= p2->s_lno);
}
}
static void *get_next_blame(const void *p)
{
return ((struct blame_entry *)p)->next;
}
static void set_next_blame(void *p1, void *p2)
{
((struct blame_entry *)p1)->next = p2;
}
/*
* Final image line numbers are all different, so we don't need a
* three-way comparison here.
*/
static int compare_blame_final(const void *p1, const void *p2)
{
return ((struct blame_entry *)p1)->lno > ((struct blame_entry *)p2)->lno
? 1 : -1;
}
static int compare_blame_suspect(const void *p1, const void *p2)
{
const struct blame_entry *s1 = p1, *s2 = p2;
/*
* to allow for collating suspects, we sort according to the
* respective pointer value as the primary sorting criterion.
* The actual relation is pretty unimportant as long as it
* establishes a total order. Comparing as integers gives us
* that.
*/
if (s1->suspect != s2->suspect)
return (intptr_t)s1->suspect > (intptr_t)s2->suspect ? 1 : -1;
if (s1->s_lno == s2->s_lno)
return 0;
return s1->s_lno > s2->s_lno ? 1 : -1;
}
static int compare_commits_by_reverse_commit_date(const void *a,
const void *b,
void *c)
@ -224,63 +79,6 @@ static int compare_commits_by_reverse_commit_date(const void *a,
return -compare_commits_by_commit_date(a, b, c);
}
static void blame_sort_final(struct blame_scoreboard *sb)
{
sb->ent = llist_mergesort(sb->ent, get_next_blame, set_next_blame,
compare_blame_final);
}
static void sanity_check_refcnt(struct blame_scoreboard *);
/*
* If two blame entries that are next to each other came from
* contiguous lines in the same origin (i.e. <commit, path> pair),
* merge them together.
*/
static void blame_coalesce(struct blame_scoreboard *sb)
{
struct blame_entry *ent, *next;
for (ent = sb->ent; ent && (next = ent->next); ent = next) {
if (ent->suspect == next->suspect &&
ent->s_lno + ent->num_lines == next->s_lno) {
ent->num_lines += next->num_lines;
ent->next = next->next;
blame_origin_decref(next->suspect);
free(next);
ent->score = 0;
next = ent; /* again */
}
}
if (sb->debug) /* sanity */
sanity_check_refcnt(sb);
}
/*
* Merge the given sorted list of blames into a preexisting origin.
* If there were no previous blames to that commit, it is entered into
* the commit priority queue of the score board.
*/
static void queue_blames(struct blame_scoreboard *sb, struct blame_origin *porigin,
struct blame_entry *sorted)
{
if (porigin->suspects)
porigin->suspects = blame_merge(porigin->suspects, sorted);
else {
struct blame_origin *o;
for (o = porigin->commit->util; o; o = o->next) {
if (o->suspects) {
porigin->suspects = sorted;
return;
}
}
porigin->suspects = sorted;
prio_queue_put(&sb->commits, porigin->commit);
}
}
/*
* Fill the blob_sha1 field of an origin if it hasn't, so that later
* call to fill_origin_blob() can use it to locate the data. blob_sha1
@ -307,1036 +105,11 @@ static int fill_blob_sha1_and_mode(struct blame_origin *origin)
return -1;
}
/*
* We have an origin -- check if the same path exists in the
* parent and return an origin structure to represent it.
*/
static struct blame_origin *find_origin(struct commit *parent,
struct blame_origin *origin)
{
struct blame_origin *porigin;
struct diff_options diff_opts;
const char *paths[2];
/* First check any existing origins */
for (porigin = parent->util; porigin; porigin = porigin->next)
if (!strcmp(porigin->path, origin->path)) {
/*
* The same path between origin and its parent
* without renaming -- the most common case.
*/
return blame_origin_incref (porigin);
}
/* See if the origin->path is different between parent
* and origin first. Most of the time they are the
* same and diff-tree is fairly efficient about this.
*/
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.detect_rename = 0;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
paths[0] = origin->path;
paths[1] = NULL;
parse_pathspec(&diff_opts.pathspec,
PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL,
PATHSPEC_LITERAL_PATH, "", paths);
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
origin->commit->tree->object.oid.hash,
"", &diff_opts);
diffcore_std(&diff_opts);
if (!diff_queued_diff.nr) {
/* The path is the same as parent */
porigin = get_origin(parent, origin->path);
oidcpy(&porigin->blob_oid, &origin->blob_oid);
porigin->mode = origin->mode;
} else {
/*
* Since origin->path is a pathspec, if the parent
* commit had it as a directory, we will see a whole
* bunch of deletion of files in the directory that we
* do not care about.
*/
int i;
struct diff_filepair *p = NULL;
for (i = 0; i < diff_queued_diff.nr; i++) {
const char *name;
p = diff_queued_diff.queue[i];
name = p->one->path ? p->one->path : p->two->path;
if (!strcmp(name, origin->path))
break;
}
if (!p)
die("internal error in blame::find_origin");
switch (p->status) {
default:
die("internal error in blame::find_origin (%c)",
p->status);
case 'M':
porigin = get_origin(parent, origin->path);
oidcpy(&porigin->blob_oid, &p->one->oid);
porigin->mode = p->one->mode;
break;
case 'A':
case 'T':
/* Did not exist in parent, or type changed */
break;
}
}
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
return porigin;
}
/*
* We have an origin -- find the path that corresponds to it in its
* parent and return an origin structure to represent it.
*/
static struct blame_origin *find_rename(struct commit *parent,
struct blame_origin *origin)
{
struct blame_origin *porigin = NULL;
struct diff_options diff_opts;
int i;
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.detect_rename = DIFF_DETECT_RENAME;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_opts.single_follow = origin->path;
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
origin->commit->tree->object.oid.hash,
"", &diff_opts);
diffcore_std(&diff_opts);
for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
if ((p->status == 'R' || p->status == 'C') &&
!strcmp(p->two->path, origin->path)) {
porigin = get_origin(parent, p->one->path);
oidcpy(&porigin->blob_oid, &p->one->oid);
porigin->mode = p->one->mode;
break;
}
}
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
return porigin;
}
/*
* Append a new blame entry to a given output queue.
*/
static void add_blame_entry(struct blame_entry ***queue,
const struct blame_entry *src)
{
struct blame_entry *e = xmalloc(sizeof(*e));
memcpy(e, src, sizeof(*e));
blame_origin_incref(e->suspect);
e->next = **queue;
**queue = e;
*queue = &e->next;
}
/*
* src typically is on-stack; we want to copy the information in it to
* a malloced blame_entry that gets added to the given queue. The
* origin of dst loses a refcnt.
*/
static void dup_entry(struct blame_entry ***queue,
struct blame_entry *dst, struct blame_entry *src)
{
blame_origin_incref(src->suspect);
blame_origin_decref(dst->suspect);
memcpy(dst, src, sizeof(*src));
dst->next = **queue;
**queue = dst;
*queue = &dst->next;
}
static const char *blame_nth_line(struct blame_scoreboard *sb, long lno)
{
return sb->final_buf + sb->lineno[lno];
}
static const char *nth_line_cb(void *data, long lno)
{
return blame_nth_line((struct blame_scoreboard *)data, lno);
}
/*
* It is known that lines between tlno to same came from parent, and e
* has an overlap with that range. it also is known that parent's
* line plno corresponds to e's line tlno.
*
* <---- e ----->
* <------>
* <------------>
* <------------>
* <------------------>
*
* Split e into potentially three parts; before this chunk, the chunk
* to be blamed for the parent, and after that portion.
*/
static void split_overlap(struct blame_entry *split,
struct blame_entry *e,
int tlno, int plno, int same,
struct blame_origin *parent)
{
int chunk_end_lno;
memset(split, 0, sizeof(struct blame_entry [3]));
if (e->s_lno < tlno) {
/* there is a pre-chunk part not blamed on parent */
split[0].suspect = blame_origin_incref(e->suspect);
split[0].lno = e->lno;
split[0].s_lno = e->s_lno;
split[0].num_lines = tlno - e->s_lno;
split[1].lno = e->lno + tlno - e->s_lno;
split[1].s_lno = plno;
}
else {
split[1].lno = e->lno;
split[1].s_lno = plno + (e->s_lno - tlno);
}
if (same < e->s_lno + e->num_lines) {
/* there is a post-chunk part not blamed on parent */
split[2].suspect = blame_origin_incref(e->suspect);
split[2].lno = e->lno + (same - e->s_lno);
split[2].s_lno = e->s_lno + (same - e->s_lno);
split[2].num_lines = e->s_lno + e->num_lines - same;
chunk_end_lno = split[2].lno;
}
else
chunk_end_lno = e->lno + e->num_lines;
split[1].num_lines = chunk_end_lno - split[1].lno;
/*
* if it turns out there is nothing to blame the parent for,
* forget about the splitting. !split[1].suspect signals this.
*/
if (split[1].num_lines < 1)
return;
split[1].suspect = blame_origin_incref(parent);
}
/*
* split_overlap() divided an existing blame e into up to three parts
* in split. Any assigned blame is moved to queue to
* reflect the split.
*/
static void split_blame(struct blame_entry ***blamed,
struct blame_entry ***unblamed,
struct blame_entry *split,
struct blame_entry *e)
{
if (split[0].suspect && split[2].suspect) {
/* The first part (reuse storage for the existing entry e) */
dup_entry(unblamed, e, &split[0]);
/* The last part -- me */
add_blame_entry(unblamed, &split[2]);
/* ... and the middle part -- parent */
add_blame_entry(blamed, &split[1]);
}
else if (!split[0].suspect && !split[2].suspect)
/*
* The parent covers the entire area; reuse storage for
* e and replace it with the parent.
*/
dup_entry(blamed, e, &split[1]);
else if (split[0].suspect) {
/* me and then parent */
dup_entry(unblamed, e, &split[0]);
add_blame_entry(blamed, &split[1]);
}
else {
/* parent and then me */
dup_entry(blamed, e, &split[1]);
add_blame_entry(unblamed, &split[2]);
}
}
/*
* After splitting the blame, the origins used by the
* on-stack blame_entry should lose one refcnt each.
*/
static void decref_split(struct blame_entry *split)
{
int i;
for (i = 0; i < 3; i++)
blame_origin_decref(split[i].suspect);
}
/*
* reverse_blame reverses the list given in head, appending tail.
* That allows us to build lists in reverse order, then reverse them
* afterwards. This can be faster than building the list in proper
* order right away. The reason is that building in proper order
* requires writing a link in the _previous_ element, while building
* in reverse order just requires placing the list head into the
* _current_ element.
*/
static struct blame_entry *reverse_blame(struct blame_entry *head,
struct blame_entry *tail)
{
while (head) {
struct blame_entry *next = head->next;
head->next = tail;
tail = head;
head = next;
}
return tail;
}
/*
* Process one hunk from the patch between the current suspect for
* blame_entry e and its parent. This first blames any unfinished
* entries before the chunk (which is where target and parent start
* differing) on the parent, and then splits blame entries at the
* start and at the end of the difference region. Since use of -M and
* -C options may lead to overlapping/duplicate source line number
* ranges, all we can rely on from sorting/merging is the order of the
* first suspect line number.
*/
static void blame_chunk(struct blame_entry ***dstq, struct blame_entry ***srcq,
int tlno, int offset, int same,
struct blame_origin *parent)
{
struct blame_entry *e = **srcq;
struct blame_entry *samep = NULL, *diffp = NULL;
while (e && e->s_lno < tlno) {
struct blame_entry *next = e->next;
/*
* current record starts before differing portion. If
* it reaches into it, we need to split it up and
* examine the second part separately.
*/
if (e->s_lno + e->num_lines > tlno) {
/* Move second half to a new record */
int len = tlno - e->s_lno;
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
n->suspect = e->suspect;
n->lno = e->lno + len;
n->s_lno = e->s_lno + len;
n->num_lines = e->num_lines - len;
e->num_lines = len;
e->score = 0;
/* Push new record to diffp */
n->next = diffp;
diffp = n;
} else
blame_origin_decref(e->suspect);
/* Pass blame for everything before the differing
* chunk to the parent */
e->suspect = blame_origin_incref(parent);
e->s_lno += offset;
e->next = samep;
samep = e;
e = next;
}
/*
* As we don't know how much of a common stretch after this
* diff will occur, the currently blamed parts are all that we
* can assign to the parent for now.
*/
if (samep) {
**dstq = reverse_blame(samep, **dstq);
*dstq = &samep->next;
}
/*
* Prepend the split off portions: everything after e starts
* after the blameable portion.
*/
e = reverse_blame(diffp, e);
/*
* Now retain records on the target while parts are different
* from the parent.
*/
samep = NULL;
diffp = NULL;
while (e && e->s_lno < same) {
struct blame_entry *next = e->next;
/*
* If current record extends into sameness, need to split.
*/
if (e->s_lno + e->num_lines > same) {
/*
* Move second half to a new record to be
* processed by later chunks
*/
int len = same - e->s_lno;
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
n->suspect = blame_origin_incref(e->suspect);
n->lno = e->lno + len;
n->s_lno = e->s_lno + len;
n->num_lines = e->num_lines - len;
e->num_lines = len;
e->score = 0;
/* Push new record to samep */
n->next = samep;
samep = n;
}
e->next = diffp;
diffp = e;
e = next;
}
**srcq = reverse_blame(diffp, reverse_blame(samep, e));
/* Move across elements that are in the unblamable portion */
if (diffp)
*srcq = &diffp->next;
}
struct blame_chunk_cb_data {
struct blame_origin *parent;
long offset;
struct blame_entry **dstq;
struct blame_entry **srcq;
};
/* diff chunks are from parent to target */
static int blame_chunk_cb(long start_a, long count_a,
long start_b, long count_b, void *data)
{
struct blame_chunk_cb_data *d = data;
if (start_a - start_b != d->offset)
die("internal error in blame::blame_chunk_cb");
blame_chunk(&d->dstq, &d->srcq, start_b, start_a - start_b,
start_b + count_b, d->parent);
d->offset = start_a + count_a - (start_b + count_b);
return 0;
}
/*
* We are looking at the origin 'target' and aiming to pass blame
* for the lines it is suspected to its parent. Run diff to find
* which lines came from parent and pass blame for them.
*/
static void pass_blame_to_parent(struct blame_scoreboard *sb,
struct blame_origin *target,
struct blame_origin *parent)
{
mmfile_t file_p, file_o;
struct blame_chunk_cb_data d;
struct blame_entry *newdest = NULL;
if (!target->suspects)
return; /* nothing remains for this target */
d.parent = parent;
d.offset = 0;
d.dstq = &newdest; d.srcq = &target->suspects;
fill_origin_blob(&sb->revs->diffopt, parent, &file_p, &sb->num_read_blob);
fill_origin_blob(&sb->revs->diffopt, target, &file_o, &sb->num_read_blob);
sb->num_get_patch++;
if (diff_hunks(&file_p, &file_o, blame_chunk_cb, &d, sb->xdl_opts))
die("unable to generate diff (%s -> %s)",
oid_to_hex(&parent->commit->object.oid),
oid_to_hex(&target->commit->object.oid));
/* The rest are the same as the parent */
blame_chunk(&d.dstq, &d.srcq, INT_MAX, d.offset, INT_MAX, parent);
*d.dstq = NULL;
queue_blames(sb, parent, newdest);
return;
}
/*
* The lines in blame_entry after splitting blames many times can become
* very small and trivial, and at some point it becomes pointless to
* blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
* ordinary C program, and it is not worth to say it was copied from
* totally unrelated file in the parent.
*
* Compute how trivial the lines in the blame_entry are.
*/
static unsigned blame_entry_score(struct blame_scoreboard *sb, struct blame_entry *e)
{
unsigned score;
const char *cp, *ep;
if (e->score)
return e->score;
score = 1;
cp = blame_nth_line(sb, e->lno);
ep = blame_nth_line(sb, e->lno + e->num_lines);
while (cp < ep) {
unsigned ch = *((unsigned char *)cp);
if (isalnum(ch))
score++;
cp++;
}
e->score = score;
return score;
}
/*
* best_so_far[] and this[] are both a split of an existing blame_entry
* that passes blame to the parent. Maintain best_so_far the best split
* so far, by comparing this and best_so_far and copying this into
* bst_so_far as needed.
*/
static void copy_split_if_better(struct blame_scoreboard *sb,
struct blame_entry *best_so_far,
struct blame_entry *this)
{
int i;
if (!this[1].suspect)
return;
if (best_so_far[1].suspect) {
if (blame_entry_score(sb, &this[1]) < blame_entry_score(sb, &best_so_far[1]))
return;
}
for (i = 0; i < 3; i++)
blame_origin_incref(this[i].suspect);
decref_split(best_so_far);
memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
}
/*
* We are looking at a part of the final image represented by
* ent (tlno and same are offset by ent->s_lno).
* tlno is where we are looking at in the final image.
* up to (but not including) same match preimage.
* plno is where we are looking at in the preimage.
*
* <-------------- final image ---------------------->
* <------ent------>
* ^tlno ^same
* <---------preimage----->
* ^plno
*
* All line numbers are 0-based.
*/
static void handle_split(struct blame_scoreboard *sb,
struct blame_entry *ent,
int tlno, int plno, int same,
struct blame_origin *parent,
struct blame_entry *split)
{
if (ent->num_lines <= tlno)
return;
if (tlno < same) {
struct blame_entry this[3];
tlno += ent->s_lno;
same += ent->s_lno;
split_overlap(this, ent, tlno, plno, same, parent);
copy_split_if_better(sb, split, this);
decref_split(this);
}
}
struct handle_split_cb_data {
struct blame_scoreboard *sb;
struct blame_entry *ent;
struct blame_origin *parent;
struct blame_entry *split;
long plno;
long tlno;
};
static int handle_split_cb(long start_a, long count_a,
long start_b, long count_b, void *data)
{
struct handle_split_cb_data *d = data;
handle_split(d->sb, d->ent, d->tlno, d->plno, start_b, d->parent,
d->split);
d->plno = start_a + count_a;
d->tlno = start_b + count_b;
return 0;
}
/*
* Find the lines from parent that are the same as ent so that
* we can pass blames to it. file_p has the blob contents for
* the parent.
*/
static void find_copy_in_blob(struct blame_scoreboard *sb,
struct blame_entry *ent,
struct blame_origin *parent,
struct blame_entry *split,
mmfile_t *file_p)
{
const char *cp;
mmfile_t file_o;
struct handle_split_cb_data d;
memset(&d, 0, sizeof(d));
d.sb = sb; d.ent = ent; d.parent = parent; d.split = split;
/*
* Prepare mmfile that contains only the lines in ent.
*/
cp = blame_nth_line(sb, ent->lno);
file_o.ptr = (char *) cp;
file_o.size = blame_nth_line(sb, ent->lno + ent->num_lines) - cp;
/*
* file_o is a part of final image we are annotating.
* file_p partially may match that image.
*/
memset(split, 0, sizeof(struct blame_entry [3]));
if (diff_hunks(file_p, &file_o, handle_split_cb, &d, sb->xdl_opts))
die("unable to generate diff (%s)",
oid_to_hex(&parent->commit->object.oid));
/* remainder, if any, all match the preimage */
handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split);
}
/* Move all blame entries from list *source that have a score smaller
* than score_min to the front of list *small.
* Returns a pointer to the link pointing to the old head of the small list.
*/
static struct blame_entry **filter_small(struct blame_scoreboard *sb,
struct blame_entry **small,
struct blame_entry **source,
unsigned score_min)
{
struct blame_entry *p = *source;
struct blame_entry *oldsmall = *small;
while (p) {
if (blame_entry_score(sb, p) <= score_min) {
*small = p;
small = &p->next;
p = *small;
} else {
*source = p;
source = &p->next;
p = *source;
}
}
*small = oldsmall;
*source = NULL;
return small;
}
/*
* See if lines currently target is suspected for can be attributed to
* parent.
*/
static void find_move_in_parent(struct blame_scoreboard *sb,
struct blame_entry ***blamed,
struct blame_entry **toosmall,
struct blame_origin *target,
struct blame_origin *parent)
{
struct blame_entry *e, split[3];
struct blame_entry *unblamed = target->suspects;
struct blame_entry *leftover = NULL;
mmfile_t file_p;
if (!unblamed)
return; /* nothing remains for this target */
fill_origin_blob(&sb->revs->diffopt, parent, &file_p, &sb->num_read_blob);
if (!file_p.ptr)
return;
/* At each iteration, unblamed has a NULL-terminated list of
* entries that have not yet been tested for blame. leftover
* contains the reversed list of entries that have been tested
* without being assignable to the parent.
*/
do {
struct blame_entry **unblamedtail = &unblamed;
struct blame_entry *next;
for (e = unblamed; e; e = next) {
next = e->next;
find_copy_in_blob(sb, e, parent, split, &file_p);
if (split[1].suspect &&
sb->move_score < blame_entry_score(sb, &split[1])) {
split_blame(blamed, &unblamedtail, split, e);
} else {
e->next = leftover;
leftover = e;
}
decref_split(split);
}
*unblamedtail = NULL;
toosmall = filter_small(sb, toosmall, &unblamed, sb->move_score);
} while (unblamed);
target->suspects = reverse_blame(leftover, NULL);
}
struct blame_list {
struct blame_entry *ent;
struct blame_entry split[3];
};
/*
* Count the number of entries the target is suspected for,
* and prepare a list of entry and the best split.
*/
static struct blame_list *setup_blame_list(struct blame_entry *unblamed,
int *num_ents_p)
{
struct blame_entry *e;
int num_ents, i;
struct blame_list *blame_list = NULL;
for (e = unblamed, num_ents = 0; e; e = e->next)
num_ents++;
if (num_ents) {
blame_list = xcalloc(num_ents, sizeof(struct blame_list));
for (e = unblamed, i = 0; e; e = e->next)
blame_list[i++].ent = e;
}
*num_ents_p = num_ents;
return blame_list;
}
/*
* For lines target is suspected for, see if we can find code movement
* across file boundary from the parent commit. porigin is the path
* in the parent we already tried.
*/
static void find_copy_in_parent(struct blame_scoreboard *sb,
struct blame_entry ***blamed,
struct blame_entry **toosmall,
struct blame_origin *target,
struct commit *parent,
struct blame_origin *porigin,
int opt)
{
struct diff_options diff_opts;
int i, j;
struct blame_list *blame_list;
int num_ents;
struct blame_entry *unblamed = target->suspects;
struct blame_entry *leftover = NULL;
if (!unblamed)
return; /* nothing remains for this target */
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&diff_opts);
/* Try "find copies harder" on new path if requested;
* we do not want to use diffcore_rename() actually to
* match things up; find_copies_harder is set only to
* force diff_tree_sha1() to feed all filepairs to diff_queue,
* and this code needs to be after diff_setup_done(), which
* usually makes find-copies-harder imply copy detection.
*/
if ((opt & PICKAXE_BLAME_COPY_HARDEST)
|| ((opt & PICKAXE_BLAME_COPY_HARDER)
&& (!porigin || strcmp(target->path, porigin->path))))
DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
if (is_null_oid(&target->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
target->commit->tree->object.oid.hash,
"", &diff_opts);
if (!DIFF_OPT_TST(&diff_opts, FIND_COPIES_HARDER))
diffcore_std(&diff_opts);
do {
struct blame_entry **unblamedtail = &unblamed;
blame_list = setup_blame_list(unblamed, &num_ents);
for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
struct blame_origin *norigin;
mmfile_t file_p;
struct blame_entry this[3];
if (!DIFF_FILE_VALID(p->one))
continue; /* does not exist in parent */
if (S_ISGITLINK(p->one->mode))
continue; /* ignore git links */
if (porigin && !strcmp(p->one->path, porigin->path))
/* find_move already dealt with this path */
continue;
norigin = get_origin(parent, p->one->path);
oidcpy(&norigin->blob_oid, &p->one->oid);
norigin->mode = p->one->mode;
fill_origin_blob(&sb->revs->diffopt, norigin, &file_p, &sb->num_read_blob);
if (!file_p.ptr)
continue;
for (j = 0; j < num_ents; j++) {
find_copy_in_blob(sb, blame_list[j].ent,
norigin, this, &file_p);
copy_split_if_better(sb, blame_list[j].split,
this);
decref_split(this);
}
blame_origin_decref(norigin);
}
for (j = 0; j < num_ents; j++) {
struct blame_entry *split = blame_list[j].split;
if (split[1].suspect &&
sb->copy_score < blame_entry_score(sb, &split[1])) {
split_blame(blamed, &unblamedtail, split,
blame_list[j].ent);
} else {
blame_list[j].ent->next = leftover;
leftover = blame_list[j].ent;
}
decref_split(split);
}
free(blame_list);
*unblamedtail = NULL;
toosmall = filter_small(sb, toosmall, &unblamed, sb->copy_score);
} while (unblamed);
target->suspects = reverse_blame(leftover, NULL);
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
}
/*
* The blobs of origin and porigin exactly match, so everything
* origin is suspected for can be blamed on the parent.
*/
static void pass_whole_blame(struct blame_scoreboard *sb,
struct blame_origin *origin, struct blame_origin *porigin)
{
struct blame_entry *e, *suspects;
if (!porigin->file.ptr && origin->file.ptr) {
/* Steal its file */
porigin->file = origin->file;
origin->file.ptr = NULL;
}
suspects = origin->suspects;
origin->suspects = NULL;
for (e = suspects; e; e = e->next) {
blame_origin_incref(porigin);
blame_origin_decref(e->suspect);
e->suspect = porigin;
}
queue_blames(sb, porigin, suspects);
}
/*
* We pass blame from the current commit to its parents. We keep saying
* "parent" (and "porigin"), but what we mean is to find scapegoat to
* exonerate ourselves.
*/
static struct commit_list *first_scapegoat(struct rev_info *revs, struct commit *commit,
int reverse)
{
if (!reverse) {
if (revs->first_parent_only &&
commit->parents &&
commit->parents->next) {
free_commit_list(commit->parents->next);
commit->parents->next = NULL;
}
return commit->parents;
}
return lookup_decoration(&revs->children, &commit->object);
}
static int num_scapegoats(struct rev_info *revs, struct commit *commit, int reverse)
{
struct commit_list *l = first_scapegoat(revs, commit, reverse);
return commit_list_count(l);
}
/* Distribute collected unsorted blames to the respected sorted lists
* in the various origins.
*/
static void distribute_blame(struct blame_scoreboard *sb, struct blame_entry *blamed)
{
blamed = llist_mergesort(blamed, get_next_blame, set_next_blame,
compare_blame_suspect);
while (blamed)
{
struct blame_origin *porigin = blamed->suspect;
struct blame_entry *suspects = NULL;
do {
struct blame_entry *next = blamed->next;
blamed->next = suspects;
suspects = blamed;
blamed = next;
} while (blamed && blamed->suspect == porigin);
suspects = reverse_blame(suspects, NULL);
queue_blames(sb, porigin, suspects);
}
}
#define MAXSG 16
static void pass_blame(struct blame_scoreboard *sb, struct blame_origin *origin, int opt)
{
struct rev_info *revs = sb->revs;
int i, pass, num_sg;
struct commit *commit = origin->commit;
struct commit_list *sg;
struct blame_origin *sg_buf[MAXSG];
struct blame_origin *porigin, **sg_origin = sg_buf;
struct blame_entry *toosmall = NULL;
struct blame_entry *blames, **blametail = &blames;
num_sg = num_scapegoats(revs, commit, sb->reverse);
if (!num_sg)
goto finish;
else if (num_sg < ARRAY_SIZE(sg_buf))
memset(sg_buf, 0, sizeof(sg_buf));
else
sg_origin = xcalloc(num_sg, sizeof(*sg_origin));
/*
* The first pass looks for unrenamed path to optimize for
* common cases, then we look for renames in the second pass.
*/
for (pass = 0; pass < 2 - sb->no_whole_file_rename; pass++) {
struct blame_origin *(*find)(struct commit *, struct blame_origin *);
find = pass ? find_rename : find_origin;
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct commit *p = sg->item;
int j, same;
if (sg_origin[i])
continue;
if (parse_commit(p))
continue;
porigin = find(p, origin);
if (!porigin)
continue;
if (!oidcmp(&porigin->blob_oid, &origin->blob_oid)) {
pass_whole_blame(sb, origin, porigin);
blame_origin_decref(porigin);
goto finish;
}
for (j = same = 0; j < i; j++)
if (sg_origin[j] &&
!oidcmp(&sg_origin[j]->blob_oid, &porigin->blob_oid)) {
same = 1;
break;
}
if (!same)
sg_origin[i] = porigin;
else
blame_origin_decref(porigin);
}
}
sb->num_commits++;
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct blame_origin *porigin = sg_origin[i];
if (!porigin)
continue;
if (!origin->previous) {
blame_origin_incref(porigin);
origin->previous = porigin;
}
pass_blame_to_parent(sb, origin, porigin);
if (!origin->suspects)
goto finish;
}
/*
* Optionally find moves in parents' files.
*/
if (opt & PICKAXE_BLAME_MOVE) {
filter_small(sb, &toosmall, &origin->suspects, sb->move_score);
if (origin->suspects) {
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct blame_origin *porigin = sg_origin[i];
if (!porigin)
continue;
find_move_in_parent(sb, &blametail, &toosmall, origin, porigin);
if (!origin->suspects)
break;
}
}
}
/*
* Optionally find copies from parents' files.
*/
if (opt & PICKAXE_BLAME_COPY) {
if (sb->copy_score > sb->move_score)
filter_small(sb, &toosmall, &origin->suspects, sb->copy_score);
else if (sb->copy_score < sb->move_score) {
origin->suspects = blame_merge(origin->suspects, toosmall);
toosmall = NULL;
filter_small(sb, &toosmall, &origin->suspects, sb->copy_score);
}
if (!origin->suspects)
goto finish;
for (i = 0, sg = first_scapegoat(revs, commit, sb->reverse);
i < num_sg && sg;
sg = sg->next, i++) {
struct blame_origin *porigin = sg_origin[i];
find_copy_in_parent(sb, &blametail, &toosmall,
origin, sg->item, porigin, opt);
if (!origin->suspects)
goto finish;
}
}
finish:
*blametail = NULL;
distribute_blame(sb, blames);
/*
* prepend toosmall to origin->suspects
*
* There is no point in sorting: this ends up on a big
* unsorted list in the caller anyway.
*/
if (toosmall) {
struct blame_entry **tail = &toosmall;
while (*tail)
tail = &(*tail)->next;
*tail = origin->suspects;
origin->suspects = toosmall;
}
for (i = 0; i < num_sg; i++) {
if (sg_origin[i]) {
drop_origin_blob(sg_origin[i]);
blame_origin_decref(sg_origin[i]);
}
}
drop_origin_blob(origin);
if (sg_buf != sg_origin)
free(sg_origin);
}
/*
* Information on commits, used for output.
*/
@ -1546,74 +319,6 @@ static void found_guilty_entry(struct blame_entry *ent, void *data)
display_progress(pi->progress, pi->blamed_lines);
}
/*
* The main loop -- while we have blobs with lines whose true origin
* is still unknown, pick one blob, and allow its lines to pass blames
* to its parents. */
static void assign_blame(struct blame_scoreboard *sb, int opt)
{
struct rev_info *revs = sb->revs;
struct commit *commit = prio_queue_get(&sb->commits);
while (commit) {
struct blame_entry *ent;
struct blame_origin *suspect = commit->util;
/* find one suspect to break down */
while (suspect && !suspect->suspects)
suspect = suspect->next;
if (!suspect) {
commit = prio_queue_get(&sb->commits);
continue;
}
assert(commit == suspect->commit);
/*
* We will use this suspect later in the loop,
* so hold onto it in the meantime.
*/
blame_origin_incref(suspect);
parse_commit(commit);
if (sb->reverse ||
(!(commit->object.flags & UNINTERESTING) &&
!(revs->max_age != -1 && commit->date < revs->max_age)))
pass_blame(sb, suspect, opt);
else {
commit->object.flags |= UNINTERESTING;
if (commit->object.parsed)
mark_parents_uninteresting(commit);
}
/* treat root commit as boundary */
if (!commit->parents && !sb->show_root)
commit->object.flags |= UNINTERESTING;
/* Take responsibility for the remaining entries */
ent = suspect->suspects;
if (ent) {
suspect->guilty = 1;
for (;;) {
struct blame_entry *next = ent->next;
if (sb->found_guilty_entry)
sb->found_guilty_entry(ent, sb->found_guilty_entry_data);
if (next) {
ent = next;
continue;
}
ent->next = sb->ent;
sb->ent = suspect->suspects;
suspect->suspects = NULL;
break;
}
}
blame_origin_decref(suspect);
if (sb->debug) /* sanity */
sanity_check_refcnt(sb);
}
}
static const char *format_time(timestamp_t time, const char *tz_str,
int show_raw_time)
{
@ -1927,29 +632,6 @@ static void find_alignment(struct blame_scoreboard *sb, int *option)
abbrev = auto_abbrev + 1;
}
/*
* For debugging -- origin is refcounted, and this asserts that
* we do not underflow.
*/
static void sanity_check_refcnt(struct blame_scoreboard *sb)
{
int baa = 0;
struct blame_entry *ent;
for (ent = sb->ent; ent; ent = ent->next) {
/* Nobody should have zero or negative refcnt */
if (ent->suspect->refcnt <= 0) {
fprintf(stderr, "%s in %s has negative refcnt %d\n",
ent->suspect->path,
oid_to_hex(&ent->suspect->commit->object.oid),
ent->suspect->refcnt);
baa = 1;
}
}
if (baa)
sb->on_sanity_fail(sb, baa);
}
static void sanity_check_on_fail(struct blame_scoreboard *sb, int baa)
{
int opt = OUTPUT_SHOW_SCORE | OUTPUT_SHOW_NUMBER | OUTPUT_SHOW_NAME;