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pack-bitmap.c: make object filtering functions generic 

In 4f3bd5606a (pack-bitmap: implement BLOB_NONE filtering, 2020-02-14),
filtering support for bitmaps was added for the 'LOFC_BLOB_NONE' filter.

In the future, we would like to add support for filters that behave as
if they exclude a certain type of object, for e.g., the tree depth
filter with depth 0.

To prepare for this, make some of the functions used for filtering more
generic, such as 'find_tip_blobs' and 'filter_bitmap_blob_none' so that
they can work over arbitrary object types.

To that end, create 'find_tip_objects' and
'filter_bitmap_exclude_type', and redefine the aforementioned functions
in terms of those.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2020-05-04 17:12:31 -06:00 committed by Junio C Hamano
parent 5bf7f1eaa5
commit 856e12c18a
1 changed files with 24 additions and 11 deletions
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35
pack-bitmap.c
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@ -715,8 +715,9 @@ static int in_bitmapped_pack(struct bitmap_index *bitmap_git,
return 0;
}
static struct bitmap *find_tip_blobs(struct bitmap_index *bitmap_git,
struct object_list *tip_objects)
static struct bitmap *find_tip_objects(struct bitmap_index *bitmap_git,
struct object_list *tip_objects,
enum object_type type)
{
struct bitmap *result = bitmap_new();
struct object_list *p;
@ -724,7 +725,7 @@ static struct bitmap *find_tip_blobs(struct bitmap_index *bitmap_git,
for (p = tip_objects; p; p = p->next) {
int pos;
if (p->item->type != OBJ_BLOB)
if (p->item->type != type)
continue;
pos = bitmap_position(bitmap_git, &p->item->oid);
@ -737,9 +738,10 @@ static struct bitmap *find_tip_blobs(struct bitmap_index *bitmap_git,
return result;
}
static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
struct object_list *tip_objects,
struct bitmap *to_filter)
static void filter_bitmap_exclude_type(struct bitmap_index *bitmap_git,
struct object_list *tip_objects,
struct bitmap *to_filter,
enum object_type type)
{
struct eindex *eindex = &bitmap_git->ext_index;
struct bitmap *tips;
@ -747,18 +749,21 @@ static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
eword_t mask;
uint32_t i;
if (type != OBJ_BLOB)
BUG("filter_bitmap_exclude_type: unsupported type '%d'", type);
/*
* The non-bitmap version of this filter never removes
* blobs which the other side specifically asked for,
* objects which the other side specifically asked for,
* so we must match that behavior.
*/
tips = find_tip_blobs(bitmap_git, tip_objects);
tips = find_tip_objects(bitmap_git, tip_objects, type);
/*
* We can use the blob type-bitmap to work in whole words
* for the objects that are actually in the bitmapped packfile.
*/
for (i = 0, init_type_iterator(&it, bitmap_git, OBJ_BLOB);
for (i = 0, init_type_iterator(&it, bitmap_git, type);
i < to_filter->word_alloc && ewah_iterator_next(&mask, &it);
i++) {
if (i < tips->word_alloc)
@ -773,7 +778,7 @@ static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
*/
for (i = 0; i < eindex->count; i++) {
uint32_t pos = i + bitmap_git->pack->num_objects;
if (eindex->objects[i]->type == OBJ_BLOB &&
if (eindex->objects[i]->type == type &&
bitmap_get(to_filter, pos) &&
!bitmap_get(tips, pos))
bitmap_unset(to_filter, pos);
@ -782,6 +787,14 @@ static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
bitmap_free(tips);
}
static void filter_bitmap_blob_none(struct bitmap_index *bitmap_git,
struct object_list *tip_objects,
struct bitmap *to_filter)
{
filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
OBJ_BLOB);
}
static unsigned long get_size_by_pos(struct bitmap_index *bitmap_git,
uint32_t pos)
{
@ -820,7 +833,7 @@ static void filter_bitmap_blob_limit(struct bitmap_index *bitmap_git,
eword_t mask;
uint32_t i;
tips = find_tip_blobs(bitmap_git, tip_objects);
tips = find_tip_objects(bitmap_git, tip_objects, OBJ_BLOB);
for (i = 0, init_type_iterator(&it, bitmap_git, OBJ_BLOB);
i < to_filter->word_alloc && ewah_iterator_next(&mask, &it);