mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
index-pack: rationalize delta resolution code
Instead of having strange loops for walking unresolved deltas with the same base duplicated in many places, let's rework the code so this is done in a single place instead. This simplifies callers quite a bit too. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
46dc1b0e33
commit
9441b61dc5
123
index-pack.c
123
index-pack.c
|
@ -244,7 +244,8 @@ static void link_base_data(struct base_data *base, struct base_data *c)
|
|||
|
||||
c->base = base;
|
||||
c->child = NULL;
|
||||
base_cache_used += c->size;
|
||||
if (c->data)
|
||||
base_cache_used += c->size;
|
||||
prune_base_data(c);
|
||||
}
|
||||
|
||||
|
@ -494,8 +495,10 @@ static void *get_base_data(struct base_data *c)
|
|||
free(raw);
|
||||
if (!c->data)
|
||||
bad_object(obj->idx.offset, "failed to apply delta");
|
||||
} else
|
||||
} else {
|
||||
c->data = get_data_from_pack(obj);
|
||||
c->size = obj->size;
|
||||
}
|
||||
|
||||
base_cache_used += c->size;
|
||||
prune_base_data(c);
|
||||
|
@ -504,49 +507,73 @@ static void *get_base_data(struct base_data *c)
|
|||
}
|
||||
|
||||
static void resolve_delta(struct object_entry *delta_obj,
|
||||
struct base_data *base_obj, enum object_type type)
|
||||
struct base_data *base, struct base_data *result)
|
||||
{
|
||||
void *delta_data;
|
||||
unsigned long delta_size;
|
||||
union delta_base delta_base;
|
||||
int j, first, last;
|
||||
struct base_data result;
|
||||
|
||||
delta_obj->real_type = type;
|
||||
delta_obj->real_type = base->obj->type;
|
||||
delta_data = get_data_from_pack(delta_obj);
|
||||
delta_size = delta_obj->size;
|
||||
result.data = patch_delta(get_base_data(base_obj), base_obj->size,
|
||||
delta_data, delta_size,
|
||||
&result.size);
|
||||
result->obj = delta_obj;
|
||||
result->data = patch_delta(get_base_data(base), base->obj->size,
|
||||
delta_data, delta_size, &result->size);
|
||||
free(delta_data);
|
||||
if (!result.data)
|
||||
if (!result->data)
|
||||
bad_object(delta_obj->idx.offset, "failed to apply delta");
|
||||
sha1_object(result.data, result.size, type, delta_obj->idx.sha1);
|
||||
sha1_object(result->data, result->size, delta_obj->real_type,
|
||||
delta_obj->idx.sha1);
|
||||
nr_resolved_deltas++;
|
||||
}
|
||||
|
||||
result.obj = delta_obj;
|
||||
link_base_data(base_obj, &result);
|
||||
static void find_unresolved_deltas(struct base_data *base,
|
||||
struct base_data *prev_base)
|
||||
{
|
||||
int i, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
|
||||
|
||||
hashcpy(delta_base.sha1, delta_obj->idx.sha1);
|
||||
if (!find_delta_children(&delta_base, &first, &last)) {
|
||||
for (j = first; j <= last; j++) {
|
||||
struct object_entry *child = objects + deltas[j].obj_no;
|
||||
if (child->real_type == OBJ_REF_DELTA)
|
||||
resolve_delta(child, &result, type);
|
||||
/*
|
||||
* This is a recursive function. Those brackets should help reducing
|
||||
* stack usage by limiting the scope of the delta_base union.
|
||||
*/
|
||||
{
|
||||
union delta_base base_spec;
|
||||
|
||||
hashcpy(base_spec.sha1, base->obj->idx.sha1);
|
||||
ref = !find_delta_children(&base_spec, &ref_first, &ref_last);
|
||||
|
||||
memset(&base_spec, 0, sizeof(base_spec));
|
||||
base_spec.offset = base->obj->idx.offset;
|
||||
ofs = !find_delta_children(&base_spec, &ofs_first, &ofs_last);
|
||||
}
|
||||
|
||||
if (!ref && !ofs)
|
||||
return;
|
||||
|
||||
link_base_data(prev_base, base);
|
||||
|
||||
if (ref) {
|
||||
for (i = ref_first; i <= ref_last; i++) {
|
||||
struct object_entry *child = objects + deltas[i].obj_no;
|
||||
if (child->real_type == OBJ_REF_DELTA) {
|
||||
struct base_data result;
|
||||
resolve_delta(child, base, &result);
|
||||
find_unresolved_deltas(&result, base);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
memset(&delta_base, 0, sizeof(delta_base));
|
||||
delta_base.offset = delta_obj->idx.offset;
|
||||
if (!find_delta_children(&delta_base, &first, &last)) {
|
||||
for (j = first; j <= last; j++) {
|
||||
struct object_entry *child = objects + deltas[j].obj_no;
|
||||
if (child->real_type == OBJ_OFS_DELTA)
|
||||
resolve_delta(child, &result, type);
|
||||
if (ofs) {
|
||||
for (i = ofs_first; i <= ofs_last; i++) {
|
||||
struct object_entry *child = objects + deltas[i].obj_no;
|
||||
if (child->real_type == OBJ_OFS_DELTA) {
|
||||
struct base_data result;
|
||||
resolve_delta(child, base, &result);
|
||||
find_unresolved_deltas(&result, base);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
unlink_base_data(&result);
|
||||
unlink_base_data(base);
|
||||
}
|
||||
|
||||
static int compare_delta_entry(const void *a, const void *b)
|
||||
|
@ -622,37 +649,13 @@ static void parse_pack_objects(unsigned char *sha1)
|
|||
progress = start_progress("Resolving deltas", nr_deltas);
|
||||
for (i = 0; i < nr_objects; i++) {
|
||||
struct object_entry *obj = &objects[i];
|
||||
union delta_base base;
|
||||
int j, ref, ref_first, ref_last, ofs, ofs_first, ofs_last;
|
||||
struct base_data base_obj;
|
||||
|
||||
if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA)
|
||||
continue;
|
||||
hashcpy(base.sha1, obj->idx.sha1);
|
||||
ref = !find_delta_children(&base, &ref_first, &ref_last);
|
||||
memset(&base, 0, sizeof(base));
|
||||
base.offset = obj->idx.offset;
|
||||
ofs = !find_delta_children(&base, &ofs_first, &ofs_last);
|
||||
if (!ref && !ofs)
|
||||
continue;
|
||||
base_obj.data = get_data_from_pack(obj);
|
||||
base_obj.size = obj->size;
|
||||
base_obj.obj = obj;
|
||||
link_base_data(NULL, &base_obj);
|
||||
|
||||
if (ref)
|
||||
for (j = ref_first; j <= ref_last; j++) {
|
||||
struct object_entry *child = objects + deltas[j].obj_no;
|
||||
if (child->real_type == OBJ_REF_DELTA)
|
||||
resolve_delta(child, &base_obj, obj->type);
|
||||
}
|
||||
if (ofs)
|
||||
for (j = ofs_first; j <= ofs_last; j++) {
|
||||
struct object_entry *child = objects + deltas[j].obj_no;
|
||||
if (child->real_type == OBJ_OFS_DELTA)
|
||||
resolve_delta(child, &base_obj, obj->type);
|
||||
}
|
||||
unlink_base_data(&base_obj);
|
||||
base_obj.data = NULL;
|
||||
find_unresolved_deltas(&base_obj, NULL);
|
||||
display_progress(progress, nr_resolved_deltas);
|
||||
}
|
||||
}
|
||||
|
@ -745,7 +748,6 @@ static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
|
|||
for (i = 0; i < n; i++) {
|
||||
struct delta_entry *d = sorted_by_pos[i];
|
||||
enum object_type type;
|
||||
int j, first, last;
|
||||
struct base_data base_obj;
|
||||
|
||||
if (objects[d->obj_no].real_type != OBJ_REF_DELTA)
|
||||
|
@ -759,16 +761,7 @@ static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved)
|
|||
die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
|
||||
base_obj.obj = append_obj_to_pack(f, d->base.sha1,
|
||||
base_obj.data, base_obj.size, type);
|
||||
link_base_data(NULL, &base_obj);
|
||||
|
||||
find_delta_children(&d->base, &first, &last);
|
||||
for (j = first; j <= last; j++) {
|
||||
struct object_entry *child = objects + deltas[j].obj_no;
|
||||
if (child->real_type == OBJ_REF_DELTA)
|
||||
resolve_delta(child, &base_obj, type);
|
||||
}
|
||||
|
||||
unlink_base_data(&base_obj);
|
||||
find_unresolved_deltas(&base_obj, NULL);
|
||||
display_progress(progress, nr_resolved_deltas);
|
||||
}
|
||||
free(sorted_by_pos);
|
||||
|
|
Loading…
Reference in a new issue