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![Junio C Hamano](/assets/img/avatar_default.png)
Developer support update, by using BUG() macro instead of die() to mark codepaths that should not happen more clearly. * js/use-bug-macro: BUG_exit_code: fix sparse "symbol not declared" warning Convert remaining die*(BUG) messages Replace all die("BUG: ...") calls by BUG() ones run-command: use BUG() to report bugs, not die() test-tool: help verifying BUG() code paths
180 lines
3.8 KiB
C
180 lines
3.8 KiB
C
#include "cache.h"
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#include "object.h"
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#include "pack.h"
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#include "pack-objects.h"
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#include "packfile.h"
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#include "config.h"
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static uint32_t locate_object_entry_hash(struct packing_data *pdata,
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const unsigned char *sha1,
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int *found)
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{
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uint32_t i, mask = (pdata->index_size - 1);
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i = sha1hash(sha1) & mask;
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while (pdata->index[i] > 0) {
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uint32_t pos = pdata->index[i] - 1;
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if (!hashcmp(sha1, pdata->objects[pos].idx.oid.hash)) {
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*found = 1;
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return i;
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}
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i = (i + 1) & mask;
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}
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*found = 0;
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return i;
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}
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static inline uint32_t closest_pow2(uint32_t v)
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{
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v = v - 1;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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return v + 1;
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}
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static void rehash_objects(struct packing_data *pdata)
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{
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uint32_t i;
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struct object_entry *entry;
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pdata->index_size = closest_pow2(pdata->nr_objects * 3);
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if (pdata->index_size < 1024)
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pdata->index_size = 1024;
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free(pdata->index);
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pdata->index = xcalloc(pdata->index_size, sizeof(*pdata->index));
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entry = pdata->objects;
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for (i = 0; i < pdata->nr_objects; i++) {
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int found;
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uint32_t ix = locate_object_entry_hash(pdata,
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entry->idx.oid.hash,
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&found);
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if (found)
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BUG("Duplicate object in hash");
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pdata->index[ix] = i + 1;
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entry++;
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}
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}
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struct object_entry *packlist_find(struct packing_data *pdata,
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const unsigned char *sha1,
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uint32_t *index_pos)
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{
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uint32_t i;
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int found;
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if (!pdata->index_size)
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return NULL;
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i = locate_object_entry_hash(pdata, sha1, &found);
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if (index_pos)
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*index_pos = i;
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if (!found)
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return NULL;
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return &pdata->objects[pdata->index[i] - 1];
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}
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static void prepare_in_pack_by_idx(struct packing_data *pdata)
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{
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struct packed_git **mapping, *p;
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int cnt = 0, nr = 1U << OE_IN_PACK_BITS;
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ALLOC_ARRAY(mapping, nr);
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/*
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* oe_in_pack() on an all-zero'd object_entry
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* (i.e. in_pack_idx also zero) should return NULL.
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*/
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mapping[cnt++] = NULL;
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for (p = get_packed_git(the_repository); p; p = p->next, cnt++) {
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if (cnt == nr) {
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free(mapping);
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return;
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}
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p->index = cnt;
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mapping[cnt] = p;
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}
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pdata->in_pack_by_idx = mapping;
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}
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/*
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* A new pack appears after prepare_in_pack_by_idx() has been
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* run. This is likely a race.
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*
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* We could map this new pack to in_pack_by_idx[] array, but then we
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* have to deal with full array anyway. And since it's hard to test
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* this fall back code, just stay simple and fall back to using
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* in_pack[] array.
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*/
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void oe_map_new_pack(struct packing_data *pack,
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struct packed_git *p)
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{
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uint32_t i;
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REALLOC_ARRAY(pack->in_pack, pack->nr_alloc);
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for (i = 0; i < pack->nr_objects; i++)
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pack->in_pack[i] = oe_in_pack(pack, pack->objects + i);
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FREE_AND_NULL(pack->in_pack_by_idx);
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}
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/* assume pdata is already zero'd by caller */
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void prepare_packing_data(struct packing_data *pdata)
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{
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if (git_env_bool("GIT_TEST_FULL_IN_PACK_ARRAY", 0)) {
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/*
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* do not initialize in_pack_by_idx[] to force the
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* slow path in oe_in_pack()
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*/
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} else {
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prepare_in_pack_by_idx(pdata);
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}
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pdata->oe_size_limit = git_env_ulong("GIT_TEST_OE_SIZE",
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1U << OE_SIZE_BITS);
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}
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struct object_entry *packlist_alloc(struct packing_data *pdata,
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const unsigned char *sha1,
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uint32_t index_pos)
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{
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struct object_entry *new_entry;
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if (pdata->nr_objects >= pdata->nr_alloc) {
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pdata->nr_alloc = (pdata->nr_alloc + 1024) * 3 / 2;
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REALLOC_ARRAY(pdata->objects, pdata->nr_alloc);
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if (!pdata->in_pack_by_idx)
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REALLOC_ARRAY(pdata->in_pack, pdata->nr_alloc);
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}
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new_entry = pdata->objects + pdata->nr_objects++;
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memset(new_entry, 0, sizeof(*new_entry));
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hashcpy(new_entry->idx.oid.hash, sha1);
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if (pdata->index_size * 3 <= pdata->nr_objects * 4)
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rehash_objects(pdata);
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else
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pdata->index[index_pos] = pdata->nr_objects;
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if (pdata->in_pack)
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pdata->in_pack[pdata->nr_objects - 1] = NULL;
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return new_entry;
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}
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