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![Junio C Hamano](/assets/img/avatar_default.png)
An unaligned 32-bit access in pack-bitmap code ahs been corrected. * jc/pack-bitmap-unaligned: pack-bitmap: don't perform unaligned memory access
1069 lines
25 KiB
C
1069 lines
25 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "diff.h"
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#include "revision.h"
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#include "progress.h"
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#include "list-objects.h"
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#include "pack.h"
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#include "pack-bitmap.h"
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#include "pack-revindex.h"
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#include "pack-objects.h"
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/*
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* An entry on the bitmap index, representing the bitmap for a given
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* commit.
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*/
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struct stored_bitmap {
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unsigned char sha1[20];
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struct ewah_bitmap *root;
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struct stored_bitmap *xor;
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int flags;
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};
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/*
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* The currently active bitmap index. By design, repositories only have
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* a single bitmap index available (the index for the biggest packfile in
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* the repository), since bitmap indexes need full closure.
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*
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* If there is more than one bitmap index available (e.g. because of alternates),
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* the active bitmap index is the largest one.
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*/
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static struct bitmap_index {
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/* Packfile to which this bitmap index belongs to */
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struct packed_git *pack;
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/*
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* Mark the first `reuse_objects` in the packfile as reused:
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* they will be sent as-is without using them for repacking
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* calculations
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*/
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uint32_t reuse_objects;
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/* mmapped buffer of the whole bitmap index */
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unsigned char *map;
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size_t map_size; /* size of the mmaped buffer */
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size_t map_pos; /* current position when loading the index */
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/*
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* Type indexes.
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*
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* Each bitmap marks which objects in the packfile are of the given
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* type. This provides type information when yielding the objects from
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* the packfile during a walk, which allows for better delta bases.
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*/
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struct ewah_bitmap *commits;
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struct ewah_bitmap *trees;
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struct ewah_bitmap *blobs;
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struct ewah_bitmap *tags;
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/* Map from SHA1 -> `stored_bitmap` for all the bitmapped commits */
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khash_sha1 *bitmaps;
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/* Number of bitmapped commits */
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uint32_t entry_count;
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/* Name-hash cache (or NULL if not present). */
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uint32_t *hashes;
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/*
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* Extended index.
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*
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* When trying to perform bitmap operations with objects that are not
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* packed in `pack`, these objects are added to this "fake index" and
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* are assumed to appear at the end of the packfile for all operations
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*/
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struct eindex {
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struct object **objects;
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uint32_t *hashes;
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uint32_t count, alloc;
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khash_sha1_pos *positions;
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} ext_index;
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/* Bitmap result of the last performed walk */
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struct bitmap *result;
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/* Version of the bitmap index */
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unsigned int version;
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unsigned loaded : 1;
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} bitmap_git;
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static struct ewah_bitmap *lookup_stored_bitmap(struct stored_bitmap *st)
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{
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struct ewah_bitmap *parent;
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struct ewah_bitmap *composed;
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if (st->xor == NULL)
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return st->root;
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composed = ewah_pool_new();
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parent = lookup_stored_bitmap(st->xor);
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ewah_xor(st->root, parent, composed);
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ewah_pool_free(st->root);
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st->root = composed;
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st->xor = NULL;
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return composed;
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}
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/*
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* Read a bitmap from the current read position on the mmaped
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* index, and increase the read position accordingly
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*/
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static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index)
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{
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struct ewah_bitmap *b = ewah_pool_new();
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int bitmap_size = ewah_read_mmap(b,
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index->map + index->map_pos,
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index->map_size - index->map_pos);
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if (bitmap_size < 0) {
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error("Failed to load bitmap index (corrupted?)");
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ewah_pool_free(b);
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return NULL;
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}
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index->map_pos += bitmap_size;
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return b;
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}
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static int load_bitmap_header(struct bitmap_index *index)
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{
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struct bitmap_disk_header *header = (void *)index->map;
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if (index->map_size < sizeof(*header) + 20)
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return error("Corrupted bitmap index (missing header data)");
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if (memcmp(header->magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)) != 0)
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return error("Corrupted bitmap index file (wrong header)");
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index->version = ntohs(header->version);
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if (index->version != 1)
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return error("Unsupported version for bitmap index file (%d)", index->version);
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/* Parse known bitmap format options */
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{
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uint32_t flags = ntohs(header->options);
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if ((flags & BITMAP_OPT_FULL_DAG) == 0)
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return error("Unsupported options for bitmap index file "
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"(Git requires BITMAP_OPT_FULL_DAG)");
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if (flags & BITMAP_OPT_HASH_CACHE) {
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unsigned char *end = index->map + index->map_size - 20;
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index->hashes = ((uint32_t *)end) - index->pack->num_objects;
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}
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}
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index->entry_count = ntohl(header->entry_count);
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index->map_pos += sizeof(*header);
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return 0;
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}
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static struct stored_bitmap *store_bitmap(struct bitmap_index *index,
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struct ewah_bitmap *root,
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const unsigned char *sha1,
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struct stored_bitmap *xor_with,
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int flags)
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{
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struct stored_bitmap *stored;
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khiter_t hash_pos;
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int ret;
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stored = xmalloc(sizeof(struct stored_bitmap));
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stored->root = root;
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stored->xor = xor_with;
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stored->flags = flags;
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hashcpy(stored->sha1, sha1);
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hash_pos = kh_put_sha1(index->bitmaps, stored->sha1, &ret);
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/* a 0 return code means the insertion succeeded with no changes,
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* because the SHA1 already existed on the map. this is bad, there
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* shouldn't be duplicated commits in the index */
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if (ret == 0) {
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error("Duplicate entry in bitmap index: %s", sha1_to_hex(sha1));
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return NULL;
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}
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kh_value(index->bitmaps, hash_pos) = stored;
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return stored;
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}
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static inline uint32_t read_be32(const unsigned char *buffer, size_t *pos)
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{
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uint32_t result = get_be32(buffer + *pos);
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(*pos) += sizeof(result);
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return result;
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}
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static inline uint8_t read_u8(const unsigned char *buffer, size_t *pos)
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{
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return buffer[(*pos)++];
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}
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#define MAX_XOR_OFFSET 160
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static int load_bitmap_entries_v1(struct bitmap_index *index)
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{
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uint32_t i;
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struct stored_bitmap *recent_bitmaps[MAX_XOR_OFFSET] = { NULL };
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for (i = 0; i < index->entry_count; ++i) {
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int xor_offset, flags;
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struct ewah_bitmap *bitmap = NULL;
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struct stored_bitmap *xor_bitmap = NULL;
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uint32_t commit_idx_pos;
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const unsigned char *sha1;
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commit_idx_pos = read_be32(index->map, &index->map_pos);
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xor_offset = read_u8(index->map, &index->map_pos);
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flags = read_u8(index->map, &index->map_pos);
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sha1 = nth_packed_object_sha1(index->pack, commit_idx_pos);
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bitmap = read_bitmap_1(index);
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if (!bitmap)
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return -1;
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if (xor_offset > MAX_XOR_OFFSET || xor_offset > i)
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return error("Corrupted bitmap pack index");
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if (xor_offset > 0) {
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xor_bitmap = recent_bitmaps[(i - xor_offset) % MAX_XOR_OFFSET];
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if (xor_bitmap == NULL)
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return error("Invalid XOR offset in bitmap pack index");
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}
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recent_bitmaps[i % MAX_XOR_OFFSET] = store_bitmap(
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index, bitmap, sha1, xor_bitmap, flags);
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}
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return 0;
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}
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static char *pack_bitmap_filename(struct packed_git *p)
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{
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size_t len;
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if (!strip_suffix(p->pack_name, ".pack", &len))
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die("BUG: pack_name does not end in .pack");
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return xstrfmt("%.*s.bitmap", (int)len, p->pack_name);
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}
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static int open_pack_bitmap_1(struct packed_git *packfile)
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{
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int fd;
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struct stat st;
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char *idx_name;
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if (open_pack_index(packfile))
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return -1;
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idx_name = pack_bitmap_filename(packfile);
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fd = git_open(idx_name);
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free(idx_name);
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if (fd < 0)
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return -1;
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if (fstat(fd, &st)) {
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close(fd);
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return -1;
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}
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if (bitmap_git.pack) {
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warning("ignoring extra bitmap file: %s", packfile->pack_name);
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close(fd);
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return -1;
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}
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bitmap_git.pack = packfile;
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bitmap_git.map_size = xsize_t(st.st_size);
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bitmap_git.map = xmmap(NULL, bitmap_git.map_size, PROT_READ, MAP_PRIVATE, fd, 0);
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bitmap_git.map_pos = 0;
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close(fd);
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if (load_bitmap_header(&bitmap_git) < 0) {
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munmap(bitmap_git.map, bitmap_git.map_size);
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bitmap_git.map = NULL;
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bitmap_git.map_size = 0;
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return -1;
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}
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return 0;
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}
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static int load_pack_bitmap(void)
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{
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assert(bitmap_git.map && !bitmap_git.loaded);
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bitmap_git.bitmaps = kh_init_sha1();
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bitmap_git.ext_index.positions = kh_init_sha1_pos();
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load_pack_revindex(bitmap_git.pack);
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if (!(bitmap_git.commits = read_bitmap_1(&bitmap_git)) ||
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!(bitmap_git.trees = read_bitmap_1(&bitmap_git)) ||
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!(bitmap_git.blobs = read_bitmap_1(&bitmap_git)) ||
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!(bitmap_git.tags = read_bitmap_1(&bitmap_git)))
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goto failed;
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if (load_bitmap_entries_v1(&bitmap_git) < 0)
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goto failed;
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bitmap_git.loaded = 1;
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return 0;
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failed:
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munmap(bitmap_git.map, bitmap_git.map_size);
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bitmap_git.map = NULL;
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bitmap_git.map_size = 0;
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return -1;
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}
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static int open_pack_bitmap(void)
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{
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struct packed_git *p;
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int ret = -1;
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assert(!bitmap_git.map && !bitmap_git.loaded);
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prepare_packed_git();
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for (p = packed_git; p; p = p->next) {
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if (open_pack_bitmap_1(p) == 0)
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ret = 0;
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}
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return ret;
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}
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int prepare_bitmap_git(void)
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{
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if (bitmap_git.loaded)
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return 0;
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if (!open_pack_bitmap())
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return load_pack_bitmap();
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return -1;
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}
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struct include_data {
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struct bitmap *base;
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struct bitmap *seen;
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};
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static inline int bitmap_position_extended(const unsigned char *sha1)
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{
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khash_sha1_pos *positions = bitmap_git.ext_index.positions;
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khiter_t pos = kh_get_sha1_pos(positions, sha1);
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if (pos < kh_end(positions)) {
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int bitmap_pos = kh_value(positions, pos);
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return bitmap_pos + bitmap_git.pack->num_objects;
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}
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return -1;
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}
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static inline int bitmap_position_packfile(const unsigned char *sha1)
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{
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off_t offset = find_pack_entry_one(sha1, bitmap_git.pack);
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if (!offset)
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return -1;
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return find_revindex_position(bitmap_git.pack, offset);
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}
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static int bitmap_position(const unsigned char *sha1)
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{
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int pos = bitmap_position_packfile(sha1);
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return (pos >= 0) ? pos : bitmap_position_extended(sha1);
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}
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static int ext_index_add_object(struct object *object, const char *name)
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{
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struct eindex *eindex = &bitmap_git.ext_index;
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khiter_t hash_pos;
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int hash_ret;
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int bitmap_pos;
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hash_pos = kh_put_sha1_pos(eindex->positions, object->oid.hash, &hash_ret);
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if (hash_ret > 0) {
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if (eindex->count >= eindex->alloc) {
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eindex->alloc = (eindex->alloc + 16) * 3 / 2;
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REALLOC_ARRAY(eindex->objects, eindex->alloc);
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REALLOC_ARRAY(eindex->hashes, eindex->alloc);
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}
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bitmap_pos = eindex->count;
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eindex->objects[eindex->count] = object;
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eindex->hashes[eindex->count] = pack_name_hash(name);
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kh_value(eindex->positions, hash_pos) = bitmap_pos;
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eindex->count++;
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} else {
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bitmap_pos = kh_value(eindex->positions, hash_pos);
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}
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return bitmap_pos + bitmap_git.pack->num_objects;
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}
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static void show_object(struct object *object, const char *name, void *data)
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{
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struct bitmap *base = data;
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int bitmap_pos;
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bitmap_pos = bitmap_position(object->oid.hash);
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if (bitmap_pos < 0)
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bitmap_pos = ext_index_add_object(object, name);
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bitmap_set(base, bitmap_pos);
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}
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static void show_commit(struct commit *commit, void *data)
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{
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}
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static int add_to_include_set(struct include_data *data,
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const unsigned char *sha1,
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int bitmap_pos)
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{
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khiter_t hash_pos;
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if (data->seen && bitmap_get(data->seen, bitmap_pos))
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return 0;
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if (bitmap_get(data->base, bitmap_pos))
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return 0;
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hash_pos = kh_get_sha1(bitmap_git.bitmaps, sha1);
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if (hash_pos < kh_end(bitmap_git.bitmaps)) {
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struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, hash_pos);
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bitmap_or_ewah(data->base, lookup_stored_bitmap(st));
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return 0;
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}
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bitmap_set(data->base, bitmap_pos);
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return 1;
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}
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static int should_include(struct commit *commit, void *_data)
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{
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struct include_data *data = _data;
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int bitmap_pos;
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bitmap_pos = bitmap_position(commit->object.oid.hash);
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if (bitmap_pos < 0)
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bitmap_pos = ext_index_add_object((struct object *)commit, NULL);
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if (!add_to_include_set(data, commit->object.oid.hash, bitmap_pos)) {
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struct commit_list *parent = commit->parents;
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while (parent) {
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parent->item->object.flags |= SEEN;
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parent = parent->next;
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}
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return 0;
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}
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return 1;
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}
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static struct bitmap *find_objects(struct rev_info *revs,
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struct object_list *roots,
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struct bitmap *seen)
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{
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struct bitmap *base = NULL;
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int needs_walk = 0;
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struct object_list *not_mapped = NULL;
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/*
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* Go through all the roots for the walk. The ones that have bitmaps
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* on the bitmap index will be `or`ed together to form an initial
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* global reachability analysis.
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*
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* The ones without bitmaps in the index will be stored in the
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* `not_mapped_list` for further processing.
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*/
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while (roots) {
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struct object *object = roots->item;
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roots = roots->next;
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if (object->type == OBJ_COMMIT) {
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khiter_t pos = kh_get_sha1(bitmap_git.bitmaps, object->oid.hash);
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if (pos < kh_end(bitmap_git.bitmaps)) {
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struct stored_bitmap *st = kh_value(bitmap_git.bitmaps, pos);
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struct ewah_bitmap *or_with = lookup_stored_bitmap(st);
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if (base == NULL)
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base = ewah_to_bitmap(or_with);
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else
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bitmap_or_ewah(base, or_with);
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object->flags |= SEEN;
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continue;
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}
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}
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object_list_insert(object, ¬_mapped);
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}
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/*
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* Best case scenario: We found bitmaps for all the roots,
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* so the resulting `or` bitmap has the full reachability analysis
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*/
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if (not_mapped == NULL)
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return base;
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|
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roots = not_mapped;
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/*
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* Let's iterate through all the roots that don't have bitmaps to
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* check if we can determine them to be reachable from the existing
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* global bitmap.
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*
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* If we cannot find them in the existing global bitmap, we'll need
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* to push them to an actual walk and run it until we can confirm
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* they are reachable
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*/
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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 = get_be32(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, 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, 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;
|
|
}
|