git/pack-bitmap.c
Lars Schneider a5436b5794 sha1_file: rename git_open_noatime() to git_open()
This function is meant to be used when reading from files in the
object store, and the original objective was to avoid smudging atime
of loose object files too often, hence its name.  Because we'll be
extending its role in the next commit to also arrange the file
descriptors they return auto-closed in the child processes, rename
it to lose "noatime" part that is too specific.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-10-25 10:59:13 -07:00

1069 lines
25 KiB
C

#include "cache.h"
#include "commit.h"
#include "tag.h"
#include "diff.h"
#include "revision.h"
#include "progress.h"
#include "list-objects.h"
#include "pack.h"
#include "pack-bitmap.h"
#include "pack-revindex.h"
#include "pack-objects.h"
/*
* An entry on the bitmap index, representing the bitmap for a given
* commit.
*/
struct stored_bitmap {
unsigned char sha1[20];
struct ewah_bitmap *root;
struct stored_bitmap *xor;
int flags;
};
/*
* The currently active bitmap index. By design, repositories only have
* a single bitmap index available (the index for the biggest packfile in
* the repository), since bitmap indexes need full closure.
*
* If there is more than one bitmap index available (e.g. because of alternates),
* the active bitmap index is the largest one.
*/
static struct bitmap_index {
/* Packfile to which this bitmap index belongs to */
struct packed_git *pack;
/*
* Mark the first `reuse_objects` in the packfile as reused:
* they will be sent as-is without using them for repacking
* calculations
*/
uint32_t reuse_objects;
/* mmapped buffer of the whole bitmap index */
unsigned char *map;
size_t map_size; /* size of the mmaped buffer */
size_t map_pos; /* current position when loading the index */
/*
* Type indexes.
*
* Each bitmap marks which objects in the packfile are of the given
* type. This provides type information when yielding the objects from
* the packfile during a walk, which allows for better delta bases.
*/
struct ewah_bitmap *commits;
struct ewah_bitmap *trees;
struct ewah_bitmap *blobs;
struct ewah_bitmap *tags;
/* Map from SHA1 -> `stored_bitmap` for all the bitmapped commits */
khash_sha1 *bitmaps;
/* Number of bitmapped commits */
uint32_t entry_count;
/* Name-hash cache (or NULL if not present). */
uint32_t *hashes;
/*
* Extended index.
*
* When trying to perform bitmap operations with objects that are not
* packed in `pack`, these objects are added to this "fake index" and
* are assumed to appear at the end of the packfile for all operations
*/
struct eindex {
struct object **objects;
uint32_t *hashes;
uint32_t count, alloc;
khash_sha1_pos *positions;
} ext_index;
/* Bitmap result of the last performed walk */
struct bitmap *result;
/* Version of the bitmap index */
unsigned int version;
unsigned loaded : 1;
} bitmap_git;
static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st)
{
struct ewah_bitmap *parent;
struct ewah_bitmap *composed;
if (st->xor == NULL)
return st->root;
composed = ewah_pool_new();
parent = lookup_stored_bitmap(st->xor);
ewah_xor(st->root, parent, composed);
ewah_pool_free(st->root);
st->root = composed;
st->xor = NULL;
return composed;
}
/*
* Read a bitmap from the current read position on the mmaped
* index, and increase the read position accordingly
*/
static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index)
{
struct ewah_bitmap *b = ewah_pool_new();
int bitmap_size = ewah_read_mmap(b,
index->map + index->map_pos,
index->map_size - index->map_pos);
if (bitmap_size < 0) {
error("Failed to load bitmap index (corrupted?)");
ewah_pool_free(b);
return NULL;
}
index->map_pos += bitmap_size;
return b;
}
static int load_bitmap_header(struct bitmap_index *index)
{
struct bitmap_disk_header *header = (void *)index->map;
if (index->map_size < sizeof(*header) + 20)
return error("Corrupted bitmap index (missing header data)");
if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0)
return error("Corrupted bitmap index file (wrong header)");
index->version = ntohs(header->version);
if (index->version != 1)
return error("Unsupported version for bitmap index file (%d)", index->version);
/* Parse known bitmap format options */
{
uint32_t flags = ntohs(header->options);
if ((flags & BITMAP_OPT_FULL_DAG) == 0)
return error("Unsupported options for bitmap index file "
"(Git requires BITMAP_OPT_FULL_DAG)");
if (flags & BITMAP_OPT_HASH_CACHE) {
unsigned char *end = index->map + index->map_size - 20;
index->hashes = ((uint32_t *)end) - index->pack->num_objects;
}
}
index->entry_count = ntohl(header->entry_count);
index->map_pos += sizeof(*header);
return 0;
}
static struct stored_bitmap *store_bitmap(struct bitmap_index *index,
struct ewah_bitmap *root,
const unsigned char *sha1,
struct stored_bitmap *xor_with,
int flags)
{
struct stored_bitmap *stored;
khiter_t hash_pos;
int ret;
stored = xmalloc(sizeof(struct stored_bitmap));
stored->root = root;
stored->xor = xor_with;
stored->flags = flags;
hashcpy(stored->sha1, sha1);
hash_pos = kh_put_sha1(index->bitmaps, stored->sha1, &ret);
/* a 0 return code means the insertion succeeded with no changes,
* because the SHA1 already existed on the map. this is bad, there
* shouldn't be duplicated commits in the index */
if (ret == 0) {
error("Duplicate entry in bitmap index: %s", sha1_to_hex(sha1));
return NULL;
}
kh_value(index->bitmaps, hash_pos) = stored;
return stored;
}
static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos)
{
uint32_t result = get_be32(buffer + *pos);
(*pos) += sizeof(result);
return result;
}
static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos)
{
return buffer[(*pos)++];
}
#define MAX_XOR_OFFSET 160
static int load_bitmap_entries_v1(struct bitmap_index *index)
{
uint32_t i;
struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL };
for (i = 0; i < index->entry_count; ++i) {
int xor_offset, flags;
struct ewah_bitmap *bitmap = NULL;
struct stored_bitmap *xor_bitmap = NULL;
uint32_t commit_idx_pos;
const unsigned char *sha1;
commit_idx_pos = read_be32(index->map, &index->map_pos);
xor_offset = read_u8(index->map, &index->map_pos);
flags = read_u8(index->map, &index->map_pos);
sha1 = nth_packed_object_sha1(index->pack, commit_idx_pos);
bitmap = read_bitmap_1(index);
if (!bitmap)
return -1;
if (xor_offset > MAX_XOR_OFFSET || xor_offset > i)
return error("Corrupted bitmap pack index");
if (xor_offset > 0) {
xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET];
if (xor_bitmap == NULL)
return error("Invalid XOR offset in bitmap pack index");
}
recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap(
index, bitmap, sha1, xor_bitmap, flags);
}
return 0;
}
static char *pack_bitmap_filename(struct packed_git *p)
{
size_t len;
if (!strip_suffix(p->pack_name, ".pack", &len))
die("BUG: pack_name does not end in .pack");
return xstrfmt("%.*s.bitmap", (int)len, p->pack_name);
}
static int open_pack_bitmap_1(struct packed_git *packfile)
{
int fd;
struct stat st;
char *idx_name;
if (open_pack_index(packfile))
return -1;
idx_name = pack_bitmap_filename(packfile);
fd = git_open(idx_name);
free(idx_name);
if (fd < 0)
return -1;
if (fstat(fd, &st)) {
close(fd);
return -1;
}
if (bitmap_git.pack) {
warning("ignoring extra bitmap file: %s", packfile->pack_name);
close(fd);
return -1;
}
bitmap_git.pack = packfile;
bitmap_git.map_size = xsize_t(st.st_size);
bitmap_git.map = xmmap(NULL, bitmap_git.map_size, PROT_READ, MAP_PRIVATE, fd, 0);
bitmap_git.map_pos = 0;
close(fd);
if (load_bitmap_header(&bitmap_git) < 0) {
munmap(bitmap_git.map, bitmap_git.map_size);
bitmap_git.map = NULL;
bitmap_git.map_size = 0;
return -1;
}
return 0;
}
static int load_pack_bitmap(void)
{
assert(bitmap_git.map && !bitmap_git.loaded);
bitmap_git.bitmaps = kh_init_sha1();
bitmap_git.ext_index.positions = kh_init_sha1_pos();
load_pack_revindex(bitmap_git.pack);
if (!(bitmap_git.commits = read_bitmap_1(&bitmap_git)) ||
!(bitmap_git.trees = read_bitmap_1(&bitmap_git)) ||
!(bitmap_git.blobs = read_bitmap_1(&bitmap_git)) ||
!(bitmap_git.tags = read_bitmap_1(&bitmap_git)))
goto failed;
if (load_bitmap_entries_v1(&bitmap_git) < 0)
goto failed;
bitmap_git.loaded = 1;
return 0;
failed:
munmap(bitmap_git.map, bitmap_git.map_size);
bitmap_git.map = NULL;
bitmap_git.map_size = 0;
return -1;
}
static int open_pack_bitmap(void)
{
struct packed_git *p;
int ret = -1;
assert(!bitmap_git.map && !bitmap_git.loaded);
prepare_packed_git();
for (p = packed_git; p; p = p->next) {
if (open_pack_bitmap_1(p) == 0)
ret = 0;
}
return ret;
}
int prepare_bitmap_git(void)
{
if (bitmap_git.loaded)
return 0;
if (!open_pack_bitmap())
return load_pack_bitmap();
return -1;
}
struct include_data {
struct bitmap *base;
struct bitmap *seen;
};
static inline int bitmap_position_extended(const unsigned char *sha1)
{
khash_sha1_pos *positions = bitmap_git.ext_index.positions;
khiter_t pos = kh_get_sha1_pos(positions, sha1);
if (pos < kh_end(positions)) {
int bitmap_pos = kh_value(positions, pos);
return bitmap_pos + bitmap_git.pack->num_objects;
}
return -1;
}
static inline int bitmap_position_packfile(const unsigned char *sha1)
{
off_t offset = find_pack_entry_one(sha1, bitmap_git.pack);
if (!offset)
return -1;
return find_revindex_position(bitmap_git.pack, offset);
}
static int bitmap_position(const unsigned char *sha1)
{
int pos = bitmap_position_packfile(sha1);
return (pos >= 0) ? pos : bitmap_position_extended(sha1);
}
static int ext_index_add_object(struct object *object, const char *name)
{
struct eindex *eindex = &bitmap_git.ext_index;
khiter_t hash_pos;
int hash_ret;
int bitmap_pos;
hash_pos = kh_put_sha1_pos(eindex->positions, object->oid.hash, &hash_ret);
if (hash_ret > 0) {
if (eindex->count >= eindex->alloc) {
eindex->alloc = (eindex->alloc + 16) * 3 / 2;
REALLOC_ARRAY(eindex->objects, eindex->alloc);
REALLOC_ARRAY(eindex->hashes, eindex->alloc);
}
bitmap_pos = eindex->count;
eindex->objects[eindex->count] = object;
eindex->hashes[eindex->count] = pack_name_hash(name);
kh_value(eindex->positions, hash_pos) = bitmap_pos;
eindex->count++;
} else {
bitmap_pos = kh_value(eindex->positions, hash_pos);
}
return bitmap_pos + bitmap_git.pack->num_objects;
}
static void show_object(struct object *object, const char *name, void *data)
{
struct bitmap *base = data;
int bitmap_pos;
bitmap_pos = bitmap_position(object->oid.hash);
if (bitmap_pos < 0)
bitmap_pos = ext_index_add_object(object, name);
bitmap_set(base, bitmap_pos);
}
static void show_commit(struct commit *commit, void *data)
{
}
static int add_to_include_set(struct include_data *data,
const unsigned char *sha1,
int bitmap_pos)
{
khiter_t hash_pos;
if (data->seen && bitmap_get(data->seen, bitmap_pos))
return 0;
if (bitmap_get(data->base, bitmap_pos))
return 0;
hash_pos = kh_get_sha1(bitmap_git.bitmaps, sha1);
if (hash_pos < kh_end(bitmap_git.bitmaps)) {
struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, hash_pos);
bitmap_or_ewah(data->base, lookup_stored_bitmap(st));
return 0;
}
bitmap_set(data->base, bitmap_pos);
return 1;
}
static int should_include(struct commit *commit, void *_data)
{
struct include_data *data = _data;
int bitmap_pos;
bitmap_pos = bitmap_position(commit->object.oid.hash);
if (bitmap_pos < 0)
bitmap_pos = ext_index_add_object((struct object *)commit, NULL);
if (!add_to_include_set(data, commit->object.oid.hash, bitmap_pos)) {
struct commit_list *parent = commit->parents;
while (parent) {
parent->item->object.flags |= SEEN;
parent = parent->next;
}
return 0;
}
return 1;
}
static struct bitmap *find_objects(struct rev_info *revs,
struct object_list *roots,
struct bitmap *seen)
{
struct bitmap *base = NULL;
int needs_walk = 0;
struct object_list *not_mapped = NULL;
/*
* Go through all the roots for the walk. The ones that have bitmaps
* on the bitmap index will be `or`ed together to form an initial
* global reachability analysis.
*
* The ones without bitmaps in the index will be stored in the
* `not_mapped_list` for further processing.
*/
while (roots) {
struct object *object = roots->item;
roots = roots->next;
if (object->type == OBJ_COMMIT) {
khiter_t pos = kh_get_sha1(bitmap_git.bitmaps, object->oid.hash);
if (pos < kh_end(bitmap_git.bitmaps)) {
struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, pos);
struct ewah_bitmap *or_with = lookup_stored_bitmap(st);
if (base == NULL)
base = ewah_to_bitmap(or_with);
else
bitmap_or_ewah(base, or_with);
object->flags |= SEEN;
continue;
}
}
object_list_insert(object, &not_mapped);
}
/*
* Best case scenario: We found bitmaps for all the roots,
* so the resulting `or` bitmap has the full reachability analysis
*/
if (not_mapped == NULL)
return base;
roots = not_mapped;
/*
* Let's iterate through all the roots that don't have bitmaps to
* check if we can determine them to be reachable from the existing
* global bitmap.
*
* If we cannot find them in the existing global bitmap, we'll need
* to push them to an actual walk and run it until we can confirm
* they are reachable
*/
while (roots) {
struct object *object = roots->item;
int pos;
roots = roots->next;
pos = bitmap_position(object->oid.hash);
if (pos < 0 || base == NULL || !bitmap_get(base, pos)) {
object->flags &= ~UNINTERESTING;
add_pending_object(revs, object, "");
needs_walk = 1;
} else {
object->flags |= SEEN;
}
}
if (needs_walk) {
struct include_data incdata;
if (base == NULL)
base = bitmap_new();
incdata.base = base;
incdata.seen = seen;
revs->include_check = should_include;
revs->include_check_data = &incdata;
if (prepare_revision_walk(revs))
die("revision walk setup failed");
traverse_commit_list(revs, show_commit, show_object, base);
}
return base;
}
static void show_extended_objects(struct bitmap *objects,
show_reachable_fn show_reach)
{
struct eindex *eindex = &bitmap_git.ext_index;
uint32_t i;
for (i = 0; i < eindex->count; ++i) {
struct object *obj;
if (!bitmap_get(objects, bitmap_git.pack->num_objects + i))
continue;
obj = eindex->objects[i];
show_reach(obj->oid.hash, obj->type, 0, eindex->hashes[i], NULL, 0);
}
}
static void show_objects_for_type(
struct bitmap *objects,
struct ewah_bitmap *type_filter,
enum object_type object_type,
show_reachable_fn show_reach)
{
size_t pos = 0, i = 0;
uint32_t offset;
struct ewah_iterator it;
eword_t filter;
if (bitmap_git.reuse_objects == bitmap_git.pack->num_objects)
return;
ewah_iterator_init(&it, type_filter);
while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) {
eword_t word = objects->words[i] & filter;
for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
const unsigned char *sha1;
struct revindex_entry *entry;
uint32_t hash = 0;
if ((word >> offset) == 0)
break;
offset += ewah_bit_ctz64(word >> offset);
if (pos + offset < bitmap_git.reuse_objects)
continue;
entry = &bitmap_git.pack->revindex[pos + offset];
sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr);
if (bitmap_git.hashes)
hash = ntohl(bitmap_git.hashes[entry->nr]);
show_reach(sha1, object_type, 0, hash, bitmap_git.pack, entry->offset);
}
pos += BITS_IN_EWORD;
i++;
}
}
static int in_bitmapped_pack(struct object_list *roots)
{
while (roots) {
struct object *object = roots->item;
roots = roots->next;
if (find_pack_entry_one(object->oid.hash, bitmap_git.pack) > 0)
return 1;
}
return 0;
}
int prepare_bitmap_walk(struct rev_info *revs)
{
unsigned int i;
unsigned int pending_nr = revs->pending.nr;
struct object_array_entry *pending_e = revs->pending.objects;
struct object_list *wants = NULL;
struct object_list *haves = NULL;
struct bitmap *wants_bitmap = NULL;
struct bitmap *haves_bitmap = NULL;
if (!bitmap_git.loaded) {
/* try to open a bitmapped pack, but don't parse it yet
* because we may not need to use it */
if (open_pack_bitmap() < 0)
return -1;
}
for (i = 0; i < pending_nr; ++i) {
struct object *object = pending_e[i].item;
if (object->type == OBJ_NONE)
parse_object_or_die(object->oid.hash, NULL);
while (object->type == OBJ_TAG) {
struct tag *tag = (struct tag *) object;
if (object->flags & UNINTERESTING)
object_list_insert(object, &haves);
else
object_list_insert(object, &wants);
if (!tag->tagged)
die("bad tag");
object = parse_object_or_die(tag->tagged->oid.hash, NULL);
}
if (object->flags & UNINTERESTING)
object_list_insert(object, &haves);
else
object_list_insert(object, &wants);
}
/*
* if we have a HAVES list, but none of those haves is contained
* in the packfile that has a bitmap, we don't have anything to
* optimize here
*/
if (haves && !in_bitmapped_pack(haves))
return -1;
/* if we don't want anything, we're done here */
if (!wants)
return -1;
/*
* now we're going to use bitmaps, so load the actual bitmap entries
* from disk. this is the point of no return; after this the rev_list
* becomes invalidated and we must perform the revwalk through bitmaps
*/
if (!bitmap_git.loaded && load_pack_bitmap() < 0)
return -1;
revs->pending.nr = 0;
revs->pending.alloc = 0;
revs->pending.objects = NULL;
if (haves) {
revs->ignore_missing_links = 1;
haves_bitmap = find_objects(revs, haves, NULL);
reset_revision_walk();
revs->ignore_missing_links = 0;
if (haves_bitmap == NULL)
die("BUG: failed to perform bitmap walk");
}
wants_bitmap = find_objects(revs, wants, haves_bitmap);
if (!wants_bitmap)
die("BUG: failed to perform bitmap walk");
if (haves_bitmap)
bitmap_and_not(wants_bitmap, haves_bitmap);
bitmap_git.result = wants_bitmap;
bitmap_free(haves_bitmap);
return 0;
}
int reuse_partial_packfile_from_bitmap(struct packed_git **packfile,
uint32_t *entries,
off_t *up_to)
{
/*
* Reuse the packfile content if we need more than
* 90% of its objects
*/
static const double REUSE_PERCENT = 0.9;
struct bitmap *result = bitmap_git.result;
uint32_t reuse_threshold;
uint32_t i, reuse_objects = 0;
assert(result);
for (i = 0; i < result->word_alloc; ++i) {
if (result->words[i] != (eword_t)~0) {
reuse_objects += ewah_bit_ctz64(~result->words[i]);
break;
}
reuse_objects += BITS_IN_EWORD;
}
#ifdef GIT_BITMAP_DEBUG
{
const unsigned char *sha1;
struct revindex_entry *entry;
entry = &bitmap_git.reverse_index->revindex[reuse_objects];
sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr);
fprintf(stderr, "Failed to reuse at %d (%016llx)\n",
reuse_objects, result->words[i]);
fprintf(stderr, " %s\n", sha1_to_hex(sha1));
}
#endif
if (!reuse_objects)
return -1;
if (reuse_objects >= bitmap_git.pack->num_objects) {
bitmap_git.reuse_objects = *entries = bitmap_git.pack->num_objects;
*up_to = -1; /* reuse the full pack */
*packfile = bitmap_git.pack;
return 0;
}
reuse_threshold = bitmap_popcount(bitmap_git.result) * REUSE_PERCENT;
if (reuse_objects < reuse_threshold)
return -1;
bitmap_git.reuse_objects = *entries = reuse_objects;
*up_to = bitmap_git.pack->revindex[reuse_objects].offset;
*packfile = bitmap_git.pack;
return 0;
}
void traverse_bitmap_commit_list(show_reachable_fn show_reachable)
{
assert(bitmap_git.result);
show_objects_for_type(bitmap_git.result, bitmap_git.commits,
OBJ_COMMIT, show_reachable);
show_objects_for_type(bitmap_git.result, bitmap_git.trees,
OBJ_TREE, show_reachable);
show_objects_for_type(bitmap_git.result, bitmap_git.blobs,
OBJ_BLOB, show_reachable);
show_objects_for_type(bitmap_git.result, bitmap_git.tags,
OBJ_TAG, show_reachable);
show_extended_objects(bitmap_git.result, show_reachable);
bitmap_free(bitmap_git.result);
bitmap_git.result = NULL;
}
static uint32_t count_object_type(struct bitmap *objects,
enum object_type type)
{
struct eindex *eindex = &bitmap_git.ext_index;
uint32_t i = 0, count = 0;
struct ewah_iterator it;
eword_t filter;
switch (type) {
case OBJ_COMMIT:
ewah_iterator_init(&it, bitmap_git.commits);
break;
case OBJ_TREE:
ewah_iterator_init(&it, bitmap_git.trees);
break;
case OBJ_BLOB:
ewah_iterator_init(&it, bitmap_git.blobs);
break;
case OBJ_TAG:
ewah_iterator_init(&it, bitmap_git.tags);
break;
default:
return 0;
}
while (i < objects->word_alloc && ewah_iterator_next(&filter, &it)) {
eword_t word = objects->words[i++] & filter;
count += ewah_bit_popcount64(word);
}
for (i = 0; i < eindex->count; ++i) {
if (eindex->objects[i]->type == type &&
bitmap_get(objects, bitmap_git.pack->num_objects + i))
count++;
}
return count;
}
void count_bitmap_commit_list(uint32_t *commits, uint32_t *trees,
uint32_t *blobs, uint32_t *tags)
{
assert(bitmap_git.result);
if (commits)
*commits = count_object_type(bitmap_git.result, OBJ_COMMIT);
if (trees)
*trees = count_object_type(bitmap_git.result, OBJ_TREE);
if (blobs)
*blobs = count_object_type(bitmap_git.result, OBJ_BLOB);
if (tags)
*tags = count_object_type(bitmap_git.result, OBJ_TAG);
}
struct bitmap_test_data {
struct bitmap *base;
struct progress *prg;
size_t seen;
};
static void test_show_object(struct object *object, const char *name,
void *data)
{
struct bitmap_test_data *tdata = data;
int bitmap_pos;
bitmap_pos = bitmap_position(object->oid.hash);
if (bitmap_pos < 0)
die("Object not in bitmap: %s\n", oid_to_hex(&object->oid));
bitmap_set(tdata->base, bitmap_pos);
display_progress(tdata->prg, ++tdata->seen);
}
static void test_show_commit(struct commit *commit, void *data)
{
struct bitmap_test_data *tdata = data;
int bitmap_pos;
bitmap_pos = bitmap_position(commit->object.oid.hash);
if (bitmap_pos < 0)
die("Object not in bitmap: %s\n", oid_to_hex(&commit->object.oid));
bitmap_set(tdata->base, bitmap_pos);
display_progress(tdata->prg, ++tdata->seen);
}
void test_bitmap_walk(struct rev_info *revs)
{
struct object *root;
struct bitmap *result = NULL;
khiter_t pos;
size_t result_popcnt;
struct bitmap_test_data tdata;
if (prepare_bitmap_git())
die("failed to load bitmap indexes");
if (revs->pending.nr != 1)
die("you must specify exactly one commit to test");
fprintf(stderr, "Bitmap v%d test (%d entries loaded)\n",
bitmap_git.version, bitmap_git.entry_count);
root = revs->pending.objects[0].item;
pos = kh_get_sha1(bitmap_git.bitmaps, root->oid.hash);
if (pos < kh_end(bitmap_git.bitmaps)) {
struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, pos);
struct ewah_bitmap *bm = lookup_stored_bitmap(st);
fprintf(stderr, "Found bitmap for %s. %d bits / %08x checksum\n",
oid_to_hex(&root->oid), (int)bm->bit_size, ewah_checksum(bm));
result = ewah_to_bitmap(bm);
}
if (result == NULL)
die("Commit %s doesn't have an indexed bitmap", oid_to_hex(&root->oid));
revs->tag_objects = 1;
revs->tree_objects = 1;
revs->blob_objects = 1;
result_popcnt = bitmap_popcount(result);
if (prepare_revision_walk(revs))
die("revision walk setup failed");
tdata.base = bitmap_new();
tdata.prg = start_progress("Verifying bitmap entries", result_popcnt);
tdata.seen = 0;
traverse_commit_list(revs, &test_show_commit, &test_show_object, &tdata);
stop_progress(&tdata.prg);
if (bitmap_equals(result, tdata.base))
fprintf(stderr, "OK!\n");
else
fprintf(stderr, "Mismatch!\n");
bitmap_free(result);
}
static int rebuild_bitmap(uint32_t *reposition,
struct ewah_bitmap *source,
struct bitmap *dest)
{
uint32_t pos = 0;
struct ewah_iterator it;
eword_t word;
ewah_iterator_init(&it, source);
while (ewah_iterator_next(&word, &it)) {
uint32_t offset, bit_pos;
for (offset = 0; offset < BITS_IN_EWORD; ++offset) {
if ((word >> offset) == 0)
break;
offset += ewah_bit_ctz64(word >> offset);
bit_pos = reposition[pos + offset];
if (bit_pos > 0)
bitmap_set(dest, bit_pos - 1);
else /* can't reuse, we don't have the object */
return -1;
}
pos += BITS_IN_EWORD;
}
return 0;
}
int rebuild_existing_bitmaps(struct packing_data *mapping,
khash_sha1 *reused_bitmaps,
int show_progress)
{
uint32_t i, num_objects;
uint32_t *reposition;
struct bitmap *rebuild;
struct stored_bitmap *stored;
struct progress *progress = NULL;
khiter_t hash_pos;
int hash_ret;
if (prepare_bitmap_git() < 0)
return -1;
num_objects = bitmap_git.pack->num_objects;
reposition = xcalloc(num_objects, sizeof(uint32_t));
for (i = 0; i < num_objects; ++i) {
const unsigned char *sha1;
struct revindex_entry *entry;
struct object_entry *oe;
entry = &bitmap_git.pack->revindex[i];
sha1 = nth_packed_object_sha1(bitmap_git.pack, entry->nr);
oe = packlist_find(mapping, sha1, NULL);
if (oe)
reposition[i] = oe->in_pack_pos + 1;
}
rebuild = bitmap_new();
i = 0;
if (show_progress)
progress = start_progress("Reusing bitmaps", 0);
kh_foreach_value(bitmap_git.bitmaps, stored, {
if (stored->flags & BITMAP_FLAG_REUSE) {
if (!rebuild_bitmap(reposition,
lookup_stored_bitmap(stored),
rebuild)) {
hash_pos = kh_put_sha1(reused_bitmaps,
stored->sha1,
&hash_ret);
kh_value(reused_bitmaps, hash_pos) =
bitmap_to_ewah(rebuild);
}
bitmap_reset(rebuild);
display_progress(progress, ++i);
}
});
stop_progress(&progress);
free(reposition);
bitmap_free(rebuild);
return 0;
}