#include "object-store.h"
#include "dir.h"
+#define IN_PACK(obj) oe_in_pack(&to_pack, obj)
+#define SIZE(obj) oe_size(&to_pack, obj)
+#define SET_SIZE(obj,size) oe_set_size(&to_pack, obj, size)
+#define DELTA_SIZE(obj) oe_delta_size(&to_pack, obj)
+#define DELTA(obj) oe_delta(&to_pack, obj)
+#define DELTA_CHILD(obj) oe_delta_child(&to_pack, obj)
+#define DELTA_SIBLING(obj) oe_delta_sibling(&to_pack, obj)
+#define SET_DELTA(obj, val) oe_set_delta(&to_pack, obj, val)
+#define SET_DELTA_SIZE(obj, val) oe_set_delta_size(&to_pack, obj, val)
+#define SET_DELTA_CHILD(obj, val) oe_set_delta_child(&to_pack, obj, val)
+#define SET_DELTA_SIBLING(obj, val) oe_set_delta_sibling(&to_pack, obj, val)
+
static const char *pack_usage[] = {
N_("git pack-objects --stdout [<options>...] [< <ref-list> | < <object-list>]"),
N_("git pack-objects [<options>...] <base-name> [< <ref-list> | < <object-list>]"),
buf = read_object_file(&entry->idx.oid, &type, &size);
if (!buf)
die("unable to read %s", oid_to_hex(&entry->idx.oid));
- base_buf = read_object_file(&entry->delta->idx.oid, &type, &base_size);
+ base_buf = read_object_file(&DELTA(entry)->idx.oid, &type,
+ &base_size);
if (!base_buf)
die("unable to read %s",
- oid_to_hex(&entry->delta->idx.oid));
+ oid_to_hex(&DELTA(entry)->idx.oid));
delta_buf = diff_delta(base_buf, base_size,
buf, size, &delta_size, 0);
- if (!delta_buf || delta_size != entry->delta_size)
+ if (!delta_buf || delta_size != DELTA_SIZE(entry))
die("delta size changed");
free(buf);
free(base_buf);
struct git_istream *st = NULL;
if (!usable_delta) {
- if (entry->type == OBJ_BLOB &&
- entry->size > big_file_threshold &&
+ if (oe_type(entry) == OBJ_BLOB &&
+ oe_size_greater_than(&to_pack, entry, big_file_threshold) &&
(st = open_istream(&entry->idx.oid, &type, &size, NULL)) != NULL)
buf = NULL;
else {
FREE_AND_NULL(entry->delta_data);
entry->z_delta_size = 0;
} else if (entry->delta_data) {
- size = entry->delta_size;
+ size = DELTA_SIZE(entry);
buf = entry->delta_data;
entry->delta_data = NULL;
- type = (allow_ofs_delta && entry->delta->idx.offset) ?
+ type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
} else {
buf = get_delta(entry);
- size = entry->delta_size;
- type = (allow_ofs_delta && entry->delta->idx.offset) ?
+ size = DELTA_SIZE(entry);
+ type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
}
* encoding of the relative offset for the delta
* base from this object's position in the pack.
*/
- off_t ofs = entry->idx.offset - entry->delta->idx.offset;
+ off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset;
unsigned pos = sizeof(dheader) - 1;
dheader[pos] = ofs & 127;
while (ofs >>= 7)
return 0;
}
hashwrite(f, header, hdrlen);
- hashwrite(f, entry->delta->idx.oid.hash, 20);
+ hashwrite(f, DELTA(entry)->idx.oid.hash, 20);
hdrlen += 20;
} else {
if (limit && hdrlen + datalen + 20 >= limit) {
static off_t write_reuse_object(struct hashfile *f, struct object_entry *entry,
unsigned long limit, int usable_delta)
{
- struct packed_git *p = entry->in_pack;
+ struct packed_git *p = IN_PACK(entry);
struct pack_window *w_curs = NULL;
struct revindex_entry *revidx;
off_t offset;
- enum object_type type = entry->type;
+ enum object_type type = oe_type(entry);
off_t datalen;
unsigned char header[MAX_PACK_OBJECT_HEADER],
dheader[MAX_PACK_OBJECT_HEADER];
unsigned hdrlen;
+ unsigned long entry_size = SIZE(entry);
- if (entry->delta)
- type = (allow_ofs_delta && entry->delta->idx.offset) ?
+ if (DELTA(entry))
+ type = (allow_ofs_delta && DELTA(entry)->idx.offset) ?
OBJ_OFS_DELTA : OBJ_REF_DELTA;
hdrlen = encode_in_pack_object_header(header, sizeof(header),
- type, entry->size);
+ type, entry_size);
offset = entry->in_pack_offset;
revidx = find_pack_revindex(p, offset);
datalen -= entry->in_pack_header_size;
if (!pack_to_stdout && p->index_version == 1 &&
- check_pack_inflate(p, &w_curs, offset, datalen, entry->size)) {
+ check_pack_inflate(p, &w_curs, offset, datalen, entry_size)) {
error("corrupt packed object for %s",
oid_to_hex(&entry->idx.oid));
unuse_pack(&w_curs);
}
if (type == OBJ_OFS_DELTA) {
- off_t ofs = entry->idx.offset - entry->delta->idx.offset;
+ off_t ofs = entry->idx.offset - DELTA(entry)->idx.offset;
unsigned pos = sizeof(dheader) - 1;
dheader[pos] = ofs & 127;
while (ofs >>= 7)
return 0;
}
hashwrite(f, header, hdrlen);
- hashwrite(f, entry->delta->idx.oid.hash, 20);
+ hashwrite(f, DELTA(entry)->idx.oid.hash, 20);
hdrlen += 20;
reused_delta++;
} else {
else
limit = pack_size_limit - write_offset;
- if (!entry->delta)
+ if (!DELTA(entry))
usable_delta = 0; /* no delta */
else if (!pack_size_limit)
usable_delta = 1; /* unlimited packfile */
- else if (entry->delta->idx.offset == (off_t)-1)
+ else if (DELTA(entry)->idx.offset == (off_t)-1)
usable_delta = 0; /* base was written to another pack */
- else if (entry->delta->idx.offset)
+ else if (DELTA(entry)->idx.offset)
usable_delta = 1; /* base already exists in this pack */
else
usable_delta = 0; /* base could end up in another pack */
if (!reuse_object)
to_reuse = 0; /* explicit */
- else if (!entry->in_pack)
+ else if (!IN_PACK(entry))
to_reuse = 0; /* can't reuse what we don't have */
- else if (entry->type == OBJ_REF_DELTA || entry->type == OBJ_OFS_DELTA)
+ else if (oe_type(entry) == OBJ_REF_DELTA ||
+ oe_type(entry) == OBJ_OFS_DELTA)
/* check_object() decided it for us ... */
to_reuse = usable_delta;
/* ... but pack split may override that */
- else if (entry->type != entry->in_pack_type)
+ else if (oe_type(entry) != entry->in_pack_type)
to_reuse = 0; /* pack has delta which is unusable */
- else if (entry->delta)
+ else if (DELTA(entry))
to_reuse = 0; /* we want to pack afresh */
else
to_reuse = 1; /* we have it in-pack undeltified,
}
/* if we are deltified, write out base object first. */
- if (e->delta) {
+ if (DELTA(e)) {
e->idx.offset = 1; /* now recurse */
- switch (write_one(f, e->delta, offset)) {
+ switch (write_one(f, DELTA(e), offset)) {
case WRITE_ONE_RECURSIVE:
/* we cannot depend on this one */
- e->delta = NULL;
+ SET_DELTA(e, NULL);
break;
default:
break;
/* add this node... */
add_to_write_order(wo, endp, e);
/* all its siblings... */
- for (s = e->delta_sibling; s; s = s->delta_sibling) {
+ for (s = DELTA_SIBLING(e); s; s = DELTA_SIBLING(s)) {
add_to_write_order(wo, endp, s);
}
}
/* drop down a level to add left subtree nodes if possible */
- if (e->delta_child) {
+ if (DELTA_CHILD(e)) {
add_to_order = 1;
- e = e->delta_child;
+ e = DELTA_CHILD(e);
} else {
add_to_order = 0;
/* our sibling might have some children, it is next */
- if (e->delta_sibling) {
- e = e->delta_sibling;
+ if (DELTA_SIBLING(e)) {
+ e = DELTA_SIBLING(e);
continue;
}
/* go back to our parent node */
- e = e->delta;
- while (e && !e->delta_sibling) {
+ e = DELTA(e);
+ while (e && !DELTA_SIBLING(e)) {
/* we're on the right side of a subtree, keep
* going up until we can go right again */
- e = e->delta;
+ e = DELTA(e);
}
if (!e) {
/* done- we hit our original root node */
return;
}
/* pass it off to sibling at this level */
- e = e->delta_sibling;
+ e = DELTA_SIBLING(e);
}
};
}
{
struct object_entry *root;
- for (root = e; root->delta; root = root->delta)
+ for (root = e; DELTA(root); root = DELTA(root))
; /* nothing */
add_descendants_to_write_order(wo, endp, root);
}
for (i = 0; i < to_pack.nr_objects; i++) {
objects[i].tagged = 0;
objects[i].filled = 0;
- objects[i].delta_child = NULL;
- objects[i].delta_sibling = NULL;
+ SET_DELTA_CHILD(&objects[i], NULL);
+ SET_DELTA_SIBLING(&objects[i], NULL);
}
/*
*/
for (i = to_pack.nr_objects; i > 0;) {
struct object_entry *e = &objects[--i];
- if (!e->delta)
+ if (!DELTA(e))
continue;
/* Mark me as the first child */
- e->delta_sibling = e->delta->delta_child;
- e->delta->delta_child = e;
+ e->delta_sibling_idx = DELTA(e)->delta_child_idx;
+ SET_DELTA_CHILD(DELTA(e), e);
}
/*
* And then all remaining commits and tags.
*/
for (i = last_untagged; i < to_pack.nr_objects; i++) {
- if (objects[i].type != OBJ_COMMIT &&
- objects[i].type != OBJ_TAG)
+ if (oe_type(&objects[i]) != OBJ_COMMIT &&
+ oe_type(&objects[i]) != OBJ_TAG)
continue;
add_to_write_order(wo, &wo_end, &objects[i]);
}
* And then all the trees.
*/
for (i = last_untagged; i < to_pack.nr_objects; i++) {
- if (objects[i].type != OBJ_TREE)
+ if (oe_type(&objects[i]) != OBJ_TREE)
continue;
add_to_write_order(wo, &wo_end, &objects[i]);
}
if (write_bitmap_index) {
bitmap_writer_set_checksum(oid.hash);
- bitmap_writer_build_type_index(written_list, nr_written);
+ bitmap_writer_build_type_index(
+ &to_pack, written_list, nr_written);
}
finish_tmp_packfile(&tmpname, pack_tmp_name,
entry = packlist_alloc(&to_pack, oid->hash, index_pos);
entry->hash = hash;
- if (type)
- entry->type = type;
+ oe_set_type(entry, type);
if (exclude)
entry->preferred_base = 1;
else
nr_result++;
if (found_pack) {
- entry->in_pack = found_pack;
+ oe_set_in_pack(&to_pack, entry, found_pack);
entry->in_pack_offset = found_offset;
}
static void check_object(struct object_entry *entry)
{
- if (entry->in_pack) {
- struct packed_git *p = entry->in_pack;
+ unsigned long canonical_size;
+
+ if (IN_PACK(entry)) {
+ struct packed_git *p = IN_PACK(entry);
struct pack_window *w_curs = NULL;
const unsigned char *base_ref = NULL;
struct object_entry *base_entry;
unsigned long avail;
off_t ofs;
unsigned char *buf, c;
+ enum object_type type;
+ unsigned long in_pack_size;
buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail);
* since non-delta representations could still be reused.
*/
used = unpack_object_header_buffer(buf, avail,
- &entry->in_pack_type,
- &entry->size);
+ &type,
+ &in_pack_size);
if (used == 0)
goto give_up;
+ if (type < 0)
+ BUG("invalid type %d", type);
+ entry->in_pack_type = type;
+
/*
* Determine if this is a delta and if so whether we can
* reuse it or not. Otherwise let's find out as cheaply as
switch (entry->in_pack_type) {
default:
/* Not a delta hence we've already got all we need. */
- entry->type = entry->in_pack_type;
+ oe_set_type(entry, entry->in_pack_type);
+ SET_SIZE(entry, in_pack_size);
entry->in_pack_header_size = used;
- if (entry->type < OBJ_COMMIT || entry->type > OBJ_BLOB)
+ if (oe_type(entry) < OBJ_COMMIT || oe_type(entry) > OBJ_BLOB)
goto give_up;
unuse_pack(&w_curs);
return;
* deltify other objects against, in order to avoid
* circular deltas.
*/
- entry->type = entry->in_pack_type;
- entry->delta = base_entry;
- entry->delta_size = entry->size;
- entry->delta_sibling = base_entry->delta_child;
- base_entry->delta_child = entry;
+ oe_set_type(entry, entry->in_pack_type);
+ SET_SIZE(entry, in_pack_size); /* delta size */
+ SET_DELTA(entry, base_entry);
+ SET_DELTA_SIZE(entry, in_pack_size);
+ entry->delta_sibling_idx = base_entry->delta_child_idx;
+ SET_DELTA_CHILD(base_entry, entry);
unuse_pack(&w_curs);
return;
}
- if (entry->type) {
+ if (oe_type(entry)) {
+ off_t delta_pos;
+
/*
* This must be a delta and we already know what the
* final object type is. Let's extract the actual
* object size from the delta header.
*/
- entry->size = get_size_from_delta(p, &w_curs,
- entry->in_pack_offset + entry->in_pack_header_size);
- if (entry->size == 0)
+ delta_pos = entry->in_pack_offset + entry->in_pack_header_size;
+ canonical_size = get_size_from_delta(p, &w_curs, delta_pos);
+ if (canonical_size == 0)
goto give_up;
+ SET_SIZE(entry, canonical_size);
unuse_pack(&w_curs);
return;
}
unuse_pack(&w_curs);
}
- entry->type = oid_object_info(the_repository, &entry->idx.oid,
- &entry->size);
- /*
- * The error condition is checked in prepare_pack(). This is
- * to permit a missing preferred base object to be ignored
- * as a preferred base. Doing so can result in a larger
- * pack file, but the transfer will still take place.
- */
+ oe_set_type(entry,
+ oid_object_info(the_repository, &entry->idx.oid, &canonical_size));
+ if (entry->type_valid) {
+ SET_SIZE(entry, canonical_size);
+ } else {
+ /*
+ * Bad object type is checked in prepare_pack(). This is
+ * to permit a missing preferred base object to be ignored
+ * as a preferred base. Doing so can result in a larger
+ * pack file, but the transfer will still take place.
+ */
+ }
}
static int pack_offset_sort(const void *_a, const void *_b)
{
const struct object_entry *a = *(struct object_entry **)_a;
const struct object_entry *b = *(struct object_entry **)_b;
+ const struct packed_git *a_in_pack = IN_PACK(a);
+ const struct packed_git *b_in_pack = IN_PACK(b);
/* avoid filesystem trashing with loose objects */
- if (!a->in_pack && !b->in_pack)
+ if (!a_in_pack && !b_in_pack)
return oidcmp(&a->idx.oid, &b->idx.oid);
- if (a->in_pack < b->in_pack)
+ if (a_in_pack < b_in_pack)
return -1;
- if (a->in_pack > b->in_pack)
+ if (a_in_pack > b_in_pack)
return 1;
return a->in_pack_offset < b->in_pack_offset ? -1 :
(a->in_pack_offset > b->in_pack_offset);
*/
static void drop_reused_delta(struct object_entry *entry)
{
- struct object_entry **p = &entry->delta->delta_child;
+ unsigned *idx = &to_pack.objects[entry->delta_idx - 1].delta_child_idx;
struct object_info oi = OBJECT_INFO_INIT;
+ enum object_type type;
+ unsigned long size;
+
+ while (*idx) {
+ struct object_entry *oe = &to_pack.objects[*idx - 1];
- while (*p) {
- if (*p == entry)
- *p = (*p)->delta_sibling;
+ if (oe == entry)
+ *idx = oe->delta_sibling_idx;
else
- p = &(*p)->delta_sibling;
+ idx = &oe->delta_sibling_idx;
}
- entry->delta = NULL;
+ SET_DELTA(entry, NULL);
entry->depth = 0;
- oi.sizep = &entry->size;
- oi.typep = &entry->type;
- if (packed_object_info(the_repository, entry->in_pack,
- entry->in_pack_offset, &oi) < 0) {
+ oi.sizep = &size;
+ oi.typep = &type;
+ if (packed_object_info(the_repository, IN_PACK(entry), entry->in_pack_offset, &oi) < 0) {
/*
* We failed to get the info from this pack for some reason;
* fall back to sha1_object_info, which may find another copy.
- * And if that fails, the error will be recorded in entry->type
+ * And if that fails, the error will be recorded in oe_type(entry)
* and dealt with in prepare_pack().
*/
- entry->type = oid_object_info(the_repository, &entry->idx.oid,
- &entry->size);
+ oe_set_type(entry,
+ oid_object_info(the_repository, &entry->idx.oid, &size));
+ } else {
+ oe_set_type(entry, type);
}
+ SET_SIZE(entry, size);
}
/*
for (cur = entry, total_depth = 0;
cur;
- cur = cur->delta, total_depth++) {
+ cur = DELTA(cur), total_depth++) {
if (cur->dfs_state == DFS_DONE) {
/*
* We've already seen this object and know it isn't
* it's not a delta, we're done traversing, but we'll mark it
* done to save time on future traversals.
*/
- if (!cur->delta) {
+ if (!DELTA(cur)) {
cur->dfs_state = DFS_DONE;
break;
}
* We keep all commits in the chain that we examined.
*/
cur->dfs_state = DFS_ACTIVE;
- if (cur->delta->dfs_state == DFS_ACTIVE) {
+ if (DELTA(cur)->dfs_state == DFS_ACTIVE) {
drop_reused_delta(cur);
cur->dfs_state = DFS_DONE;
break;
* an extra "next" pointer to keep going after we reset cur->delta.
*/
for (cur = entry; cur; cur = next) {
- next = cur->delta;
+ next = DELTA(cur);
/*
* We should have a chain of zero or more ACTIVE states down to
for (i = 0; i < to_pack.nr_objects; i++) {
struct object_entry *entry = sorted_by_offset[i];
check_object(entry);
- if (big_file_threshold < entry->size)
+ if (entry->type_valid &&
+ oe_size_greater_than(&to_pack, entry, big_file_threshold))
entry->no_try_delta = 1;
display_progress(progress_state, i + 1);
}
{
const struct object_entry *a = *(struct object_entry **)_a;
const struct object_entry *b = *(struct object_entry **)_b;
+ enum object_type a_type = oe_type(a);
+ enum object_type b_type = oe_type(b);
+ unsigned long a_size = SIZE(a);
+ unsigned long b_size = SIZE(b);
- if (a->type > b->type)
+ if (a_type > b_type)
return -1;
- if (a->type < b->type)
+ if (a_type < b_type)
return 1;
if (a->hash > b->hash)
return -1;
return -1;
if (a->preferred_base < b->preferred_base)
return 1;
- if (a->size > b->size)
+ if (a_size > b_size)
return -1;
- if (a->size < b->size)
+ if (a_size < b_size)
return 1;
return a < b ? -1 : (a > b); /* newest first */
}
#endif
+/*
+ * Return the size of the object without doing any delta
+ * reconstruction (so non-deltas are true object sizes, but deltas
+ * return the size of the delta data).
+ */
+unsigned long oe_get_size_slow(struct packing_data *pack,
+ const struct object_entry *e)
+{
+ struct packed_git *p;
+ struct pack_window *w_curs;
+ unsigned char *buf;
+ enum object_type type;
+ unsigned long used, avail, size;
+
+ if (e->type_ != OBJ_OFS_DELTA && e->type_ != OBJ_REF_DELTA) {
+ read_lock();
+ if (oid_object_info(the_repository, &e->idx.oid, &size) < 0)
+ die(_("unable to get size of %s"),
+ oid_to_hex(&e->idx.oid));
+ read_unlock();
+ return size;
+ }
+
+ p = oe_in_pack(pack, e);
+ if (!p)
+ BUG("when e->type is a delta, it must belong to a pack");
+
+ read_lock();
+ w_curs = NULL;
+ buf = use_pack(p, &w_curs, e->in_pack_offset, &avail);
+ used = unpack_object_header_buffer(buf, avail, &type, &size);
+ if (used == 0)
+ die(_("unable to parse object header of %s"),
+ oid_to_hex(&e->idx.oid));
+
+ unuse_pack(&w_curs);
+ read_unlock();
+ return size;
+}
+
static int try_delta(struct unpacked *trg, struct unpacked *src,
unsigned max_depth, unsigned long *mem_usage)
{
void *delta_buf;
/* Don't bother doing diffs between different types */
- if (trg_entry->type != src_entry->type)
+ if (oe_type(trg_entry) != oe_type(src_entry))
return -1;
/*
* it, we will still save the transfer cost, as we already know
* the other side has it and we won't send src_entry at all.
*/
- if (reuse_delta && trg_entry->in_pack &&
- trg_entry->in_pack == src_entry->in_pack &&
+ if (reuse_delta && IN_PACK(trg_entry) &&
+ IN_PACK(trg_entry) == IN_PACK(src_entry) &&
!src_entry->preferred_base &&
trg_entry->in_pack_type != OBJ_REF_DELTA &&
trg_entry->in_pack_type != OBJ_OFS_DELTA)
return 0;
/* Now some size filtering heuristics. */
- trg_size = trg_entry->size;
- if (!trg_entry->delta) {
+ trg_size = SIZE(trg_entry);
+ if (!DELTA(trg_entry)) {
max_size = trg_size/2 - 20;
ref_depth = 1;
} else {
- max_size = trg_entry->delta_size;
+ max_size = DELTA_SIZE(trg_entry);
ref_depth = trg->depth;
}
max_size = (uint64_t)max_size * (max_depth - src->depth) /
(max_depth - ref_depth + 1);
if (max_size == 0)
return 0;
- src_size = src_entry->size;
+ src_size = SIZE(src_entry);
sizediff = src_size < trg_size ? trg_size - src_size : 0;
if (sizediff >= max_size)
return 0;
delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
if (!delta_buf)
return 0;
+ if (delta_size >= (1U << OE_DELTA_SIZE_BITS)) {
+ free(delta_buf);
+ return 0;
+ }
- if (trg_entry->delta) {
+ if (DELTA(trg_entry)) {
/* Prefer only shallower same-sized deltas. */
- if (delta_size == trg_entry->delta_size &&
+ if (delta_size == DELTA_SIZE(trg_entry) &&
src->depth + 1 >= trg->depth) {
free(delta_buf);
return 0;
free(trg_entry->delta_data);
cache_lock();
if (trg_entry->delta_data) {
- delta_cache_size -= trg_entry->delta_size;
+ delta_cache_size -= DELTA_SIZE(trg_entry);
trg_entry->delta_data = NULL;
}
if (delta_cacheable(src_size, trg_size, delta_size)) {
free(delta_buf);
}
- trg_entry->delta = src_entry;
- trg_entry->delta_size = delta_size;
+ SET_DELTA(trg_entry, src_entry);
+ SET_DELTA_SIZE(trg_entry, delta_size);
trg->depth = src->depth + 1;
return 1;
static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
{
- struct object_entry *child = me->delta_child;
+ struct object_entry *child = DELTA_CHILD(me);
unsigned int m = n;
while (child) {
unsigned int c = check_delta_limit(child, n + 1);
if (m < c)
m = c;
- child = child->delta_sibling;
+ child = DELTA_SIBLING(child);
}
return m;
}
free_delta_index(n->index);
n->index = NULL;
if (n->data) {
- freed_mem += n->entry->size;
+ freed_mem += SIZE(n->entry);
FREE_AND_NULL(n->data);
}
n->entry = NULL;
* otherwise they would become too deep.
*/
max_depth = depth;
- if (entry->delta_child) {
+ if (DELTA_CHILD(entry)) {
max_depth -= check_delta_limit(entry, 0);
if (max_depth <= 0)
goto next;
* between writes at that moment.
*/
if (entry->delta_data && !pack_to_stdout) {
- entry->z_delta_size = do_compress(&entry->delta_data,
- entry->delta_size);
- cache_lock();
- delta_cache_size -= entry->delta_size;
- delta_cache_size += entry->z_delta_size;
- cache_unlock();
+ unsigned long size;
+
+ size = do_compress(&entry->delta_data, DELTA_SIZE(entry));
+ if (size < (1U << OE_Z_DELTA_BITS)) {
+ entry->z_delta_size = size;
+ cache_lock();
+ delta_cache_size -= DELTA_SIZE(entry);
+ delta_cache_size += entry->z_delta_size;
+ cache_unlock();
+ } else {
+ FREE_AND_NULL(entry->delta_data);
+ entry->z_delta_size = 0;
+ }
}
/* if we made n a delta, and if n is already at max
* depth, leaving it in the window is pointless. we
* should evict it first.
*/
- if (entry->delta && max_depth <= n->depth)
+ if (DELTA(entry) && max_depth <= n->depth)
continue;
/*
* currently deltified object, to keep it longer. It will
* be the first base object to be attempted next.
*/
- if (entry->delta) {
+ if (DELTA(entry)) {
struct unpacked swap = array[best_base];
int dist = (window + idx - best_base) % window;
int dst = best_base;
for (i = 0; i < to_pack.nr_objects; i++) {
struct object_entry *entry = to_pack.objects + i;
- if (entry->delta)
+ if (DELTA(entry))
/* This happens if we decided to reuse existing
* delta from a pack. "reuse_delta &&" is implied.
*/
continue;
- if (entry->size < 50)
+ if (!entry->type_valid ||
+ oe_size_less_than(&to_pack, entry, 50))
continue;
if (entry->no_try_delta)
if (!entry->preferred_base) {
nr_deltas++;
- if (entry->type < 0)
+ if (oe_type(entry) < 0)
die("unable to get type of object %s",
oid_to_hex(&entry->idx.oid));
} else {
- if (entry->type < 0) {
+ if (oe_type(entry) < 0) {
/*
* This object is not found, but we
* don't have to include it anyway.
die("expected object ID, got garbage:\n %s", line);
add_preferred_base_object(p + 1);
- add_object_entry(&oid, 0, p + 1, 0);
+ add_object_entry(&oid, OBJ_NONE, p + 1, 0);
}
}
OPT_END(),
};
+ if (DFS_NUM_STATES > (1 << OE_DFS_STATE_BITS))
+ BUG("too many dfs states, increase OE_DFS_STATE_BITS");
+
check_replace_refs = 0;
reset_pack_idx_option(&pack_idx_opts);
if (pack_to_stdout != !base_name || argc)
usage_with_options(pack_usage, pack_objects_options);
+ if (depth >= (1 << OE_DEPTH_BITS)) {
+ warning(_("delta chain depth %d is too deep, forcing %d"),
+ depth, (1 << OE_DEPTH_BITS) - 1);
+ depth = (1 << OE_DEPTH_BITS) - 1;
+ }
+ if (cache_max_small_delta_size >= (1U << OE_Z_DELTA_BITS)) {
+ warning(_("pack.deltaCacheLimit is too high, forcing %d"),
+ (1U << OE_Z_DELTA_BITS) - 1);
+ cache_max_small_delta_size = (1U << OE_Z_DELTA_BITS) - 1;
+ }
+
argv_array_push(&rp, "pack-objects");
if (thin) {
use_internal_rev_list = 1;
}
}
+ prepare_packing_data(&to_pack);
+
if (progress)
progress_state = start_progress(_("Enumerating objects"), 0);
if (!use_internal_rev_list)
#ifndef PACK_OBJECTS_H
#define PACK_OBJECTS_H
+#include "object-store.h"
+
#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)
+#define OE_DFS_STATE_BITS 2
+#define OE_DEPTH_BITS 12
+#define OE_IN_PACK_BITS 10
+#define OE_Z_DELTA_BITS 20
+/*
+ * Note that oe_set_size() becomes expensive when the given size is
+ * above this limit. Don't lower it too much.
+ */
+#define OE_SIZE_BITS 31
+#define OE_DELTA_SIZE_BITS 20
+
+/*
+ * State flags for depth-first search used for analyzing delta cycles.
+ *
+ * The depth is measured in delta-links to the base (so if A is a delta
+ * against B, then A has a depth of 1, and B a depth of 0).
+ */
+enum dfs_state {
+ DFS_NONE = 0,
+ DFS_ACTIVE,
+ DFS_DONE,
+ DFS_NUM_STATES
+};
+
+/*
+ * The size of struct nearly determines pack-objects's memory
+ * consumption. This struct is packed tight for that reason. When you
+ * add or reorder something in this struct, think a bit about this.
+ *
+ * basic object info
+ * -----------------
+ * idx.oid is filled up before delta searching starts. idx.crc32 is
+ * only valid after the object is written out and will be used for
+ * generating the index. idx.offset will be both gradually set and
+ * used in writing phase (base objects get offset first, then deltas
+ * refer to them)
+ *
+ * "size" is the uncompressed object size. Compressed size of the raw
+ * data for an object in a pack is not stored anywhere but is computed
+ * and made available when reverse .idx is made. Note that when a
+ * delta is reused, "size" is the uncompressed _delta_ size, not the
+ * canonical one after the delta has been applied.
+ *
+ * "hash" contains a path name hash which is used for sorting the
+ * delta list and also during delta searching. Once prepare_pack()
+ * returns it's no longer needed.
+ *
+ * source pack info
+ * ----------------
+ * The (in_pack, in_pack_offset) tuple contains the location of the
+ * object in the source pack. in_pack_header_size allows quickly
+ * skipping the header and going straight to the zlib stream.
+ *
+ * "type" and "in_pack_type" both describe object type. in_pack_type
+ * may contain a delta type, while type is always the canonical type.
+ *
+ * deltas
+ * ------
+ * Delta links (delta, delta_child and delta_sibling) are created to
+ * reflect that delta graph from the source pack then updated or added
+ * during delta searching phase when we find better deltas.
+ *
+ * delta_child and delta_sibling are last needed in
+ * compute_write_order(). "delta" and "delta_size" must remain valid
+ * at object writing phase in case the delta is not cached.
+ *
+ * If a delta is cached in memory and is compressed, delta_data points
+ * to the data and z_delta_size contains the compressed size. If it's
+ * uncompressed [1], z_delta_size must be zero. delta_size is always
+ * the uncompressed size and must be valid even if the delta is not
+ * cached.
+ *
+ * [1] during try_delta phase we don't bother with compressing because
+ * the delta could be quickly replaced with a better one.
+ */
struct object_entry {
struct pack_idx_entry idx;
- unsigned long size; /* uncompressed size */
- struct packed_git *in_pack; /* already in pack */
- off_t in_pack_offset;
- struct object_entry *delta; /* delta base object */
- struct object_entry *delta_child; /* deltified objects who bases me */
- struct object_entry *delta_sibling; /* other deltified objects who
- * uses the same base as me
- */
void *delta_data; /* cached delta (uncompressed) */
- unsigned long delta_size; /* delta data size (uncompressed) */
- unsigned long z_delta_size; /* delta data size (compressed) */
- enum object_type type;
- enum object_type in_pack_type; /* could be delta */
+ off_t in_pack_offset;
uint32_t hash; /* name hint hash */
- unsigned int in_pack_pos;
- unsigned char in_pack_header_size;
+ unsigned size_:OE_SIZE_BITS;
+ unsigned size_valid:1;
+ uint32_t delta_idx; /* delta base object */
+ uint32_t delta_child_idx; /* deltified objects who bases me */
+ uint32_t delta_sibling_idx; /* other deltified objects who
+ * uses the same base as me
+ */
+ unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
+ unsigned delta_size_valid:1;
+ unsigned in_pack_idx:OE_IN_PACK_BITS; /* already in pack */
+ unsigned z_delta_size:OE_Z_DELTA_BITS;
+ unsigned type_valid:1;
+ unsigned type_:TYPE_BITS;
+ unsigned no_try_delta:1;
+ unsigned in_pack_type:TYPE_BITS; /* could be delta */
unsigned preferred_base:1; /*
* we do not pack this, but is available
* to be used as the base object to delta
* objects against.
*/
- unsigned no_try_delta:1;
unsigned tagged:1; /* near the very tip of refs */
unsigned filled:1; /* assigned write-order */
+ unsigned dfs_state:OE_DFS_STATE_BITS;
+ unsigned char in_pack_header_size;
+ unsigned depth:OE_DEPTH_BITS;
/*
- * State flags for depth-first search used for analyzing delta cycles.
+ * pahole results on 64-bit linux (gcc and clang)
*
- * The depth is measured in delta-links to the base (so if A is a delta
- * against B, then A has a depth of 1, and B a depth of 0).
+ * size: 80, bit_padding: 20 bits, holes: 8 bits
+ *
+ * and on 32-bit (gcc)
+ *
+ * size: 76, bit_padding: 20 bits, holes: 8 bits
*/
- enum {
- DFS_NONE = 0,
- DFS_ACTIVE,
- DFS_DONE
- } dfs_state;
- int depth;
};
struct packing_data {
int32_t *index;
uint32_t index_size;
+
+ unsigned int *in_pack_pos;
+
+ /*
+ * Only one of these can be non-NULL and they have different
+ * sizes. if in_pack_by_idx is allocated, oe_in_pack() returns
+ * the pack of an object using in_pack_idx field. If not,
+ * in_pack[] array is used the same way as in_pack_pos[]
+ */
+ struct packed_git **in_pack_by_idx;
+ struct packed_git **in_pack;
+
+ uintmax_t oe_size_limit;
};
+void prepare_packing_data(struct packing_data *pdata);
struct object_entry *packlist_alloc(struct packing_data *pdata,
const unsigned char *sha1,
uint32_t index_pos);
return hash;
}
+static inline enum object_type oe_type(const struct object_entry *e)
+{
+ return e->type_valid ? e->type_ : OBJ_BAD;
+}
+
+static inline void oe_set_type(struct object_entry *e,
+ enum object_type type)
+{
+ if (type >= OBJ_ANY)
+ BUG("OBJ_ANY cannot be set in pack-objects code");
+
+ e->type_valid = type >= OBJ_NONE;
+ e->type_ = (unsigned)type;
+}
+
+static inline unsigned int oe_in_pack_pos(const struct packing_data *pack,
+ const struct object_entry *e)
+{
+ return pack->in_pack_pos[e - pack->objects];
+}
+
+static inline void oe_set_in_pack_pos(const struct packing_data *pack,
+ const struct object_entry *e,
+ unsigned int pos)
+{
+ pack->in_pack_pos[e - pack->objects] = pos;
+}
+
+static inline struct packed_git *oe_in_pack(const struct packing_data *pack,
+ const struct object_entry *e)
+{
+ if (pack->in_pack_by_idx)
+ return pack->in_pack_by_idx[e->in_pack_idx];
+ else
+ return pack->in_pack[e - pack->objects];
+}
+
+void oe_map_new_pack(struct packing_data *pack,
+ struct packed_git *p);
+static inline void oe_set_in_pack(struct packing_data *pack,
+ struct object_entry *e,
+ struct packed_git *p)
+{
+ if (!p->index)
+ oe_map_new_pack(pack, p);
+ if (pack->in_pack_by_idx)
+ e->in_pack_idx = p->index;
+ else
+ pack->in_pack[e - pack->objects] = p;
+}
+
+static inline struct object_entry *oe_delta(
+ const struct packing_data *pack,
+ const struct object_entry *e)
+{
+ if (e->delta_idx)
+ return &pack->objects[e->delta_idx - 1];
+ return NULL;
+}
+
+static inline void oe_set_delta(struct packing_data *pack,
+ struct object_entry *e,
+ struct object_entry *delta)
+{
+ if (delta)
+ e->delta_idx = (delta - pack->objects) + 1;
+ else
+ e->delta_idx = 0;
+}
+
+static inline struct object_entry *oe_delta_child(
+ const struct packing_data *pack,
+ const struct object_entry *e)
+{
+ if (e->delta_child_idx)
+ return &pack->objects[e->delta_child_idx - 1];
+ return NULL;
+}
+
+static inline void oe_set_delta_child(struct packing_data *pack,
+ struct object_entry *e,
+ struct object_entry *delta)
+{
+ if (delta)
+ e->delta_child_idx = (delta - pack->objects) + 1;
+ else
+ e->delta_child_idx = 0;
+}
+
+static inline struct object_entry *oe_delta_sibling(
+ const struct packing_data *pack,
+ const struct object_entry *e)
+{
+ if (e->delta_sibling_idx)
+ return &pack->objects[e->delta_sibling_idx - 1];
+ return NULL;
+}
+
+static inline void oe_set_delta_sibling(struct packing_data *pack,
+ struct object_entry *e,
+ struct object_entry *delta)
+{
+ if (delta)
+ e->delta_sibling_idx = (delta - pack->objects) + 1;
+ else
+ e->delta_sibling_idx = 0;
+}
+
+unsigned long oe_get_size_slow(struct packing_data *pack,
+ const struct object_entry *e);
+static inline unsigned long oe_size(struct packing_data *pack,
+ const struct object_entry *e)
+{
+ if (e->size_valid)
+ return e->size_;
+
+ return oe_get_size_slow(pack, e);
+}
+
+static inline int oe_size_less_than(struct packing_data *pack,
+ const struct object_entry *lhs,
+ unsigned long rhs)
+{
+ if (lhs->size_valid)
+ return lhs->size_ < rhs;
+ if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
+ return 0;
+ return oe_get_size_slow(pack, lhs) < rhs;
+}
+
+static inline int oe_size_greater_than(struct packing_data *pack,
+ const struct object_entry *lhs,
+ unsigned long rhs)
+{
+ if (lhs->size_valid)
+ return lhs->size_ > rhs;
+ if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
+ return 1;
+ return oe_get_size_slow(pack, lhs) > rhs;
+}
+
+static inline void oe_set_size(struct packing_data *pack,
+ struct object_entry *e,
+ unsigned long size)
+{
+ if (size < pack->oe_size_limit) {
+ e->size_ = size;
+ e->size_valid = 1;
+ } else {
+ e->size_valid = 0;
+ if (oe_get_size_slow(pack, e) != size)
+ BUG("'size' is supposed to be the object size!");
+ }
+}
+
+static inline unsigned long oe_delta_size(struct packing_data *pack,
+ const struct object_entry *e)
+{
+ if (e->delta_size_valid)
+ return e->delta_size_;
+ return oe_size(pack, e);
+}
+
+static inline void oe_set_delta_size(struct packing_data *pack,
+ struct object_entry *e,
+ unsigned long size)
+{
+ e->delta_size_ = size;
+ e->delta_size_valid = e->delta_size_ == size;
+ if (!e->delta_size_valid && size != oe_size(pack, e))
+ BUG("this can only happen in check_object() "
+ "where delta size is the same as entry size");
+}
+
#endif