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14825944d7
92d8ed8ac1 (oidtree: a crit-bit tree for odb_loose_cache, 2021-07-07)
adds a struct oidtree_node that contains only an n field with a
struct cb_node.
unfortunately, while building in pedantic mode witch clang 12 (as well
as a similar error from gcc 11) it will show:
oidtree.c:11:17: error: 'n' may not be nested in a struct due to flexible array member [-Werror,-Wflexible-array-extensions]
struct cb_node n;
^
because of a constrain coded in ISO C 11 6.7.2.1¶3 that forbids using
structs that contain a flexible array as part of another struct.
use a strict cb_node directly instead.
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* A wrapper around cbtree which stores oids
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* May be used to replace oid-array for prefix (abbreviation) matches
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*/
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#include "oidtree.h"
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#include "alloc.h"
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#include "hash.h"
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struct oidtree_iter_data {
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oidtree_iter fn;
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void *arg;
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size_t *last_nibble_at;
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int algo;
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uint8_t last_byte;
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};
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void oidtree_init(struct oidtree *ot)
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{
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cb_init(&ot->tree);
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mem_pool_init(&ot->mem_pool, 0);
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}
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void oidtree_clear(struct oidtree *ot)
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{
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if (ot) {
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mem_pool_discard(&ot->mem_pool, 0);
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oidtree_init(ot);
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}
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}
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void oidtree_insert(struct oidtree *ot, const struct object_id *oid)
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{
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struct cb_node *on;
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if (!oid->algo)
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BUG("oidtree_insert requires oid->algo");
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on = mem_pool_alloc(&ot->mem_pool, sizeof(*on) + sizeof(*oid));
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oidcpy_with_padding((struct object_id *)on->k, oid);
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/*
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* n.b. Current callers won't get us duplicates, here. If a
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* future caller causes duplicates, there'll be a a small leak
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* that won't be freed until oidtree_clear. Currently it's not
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* worth maintaining a free list
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*/
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cb_insert(&ot->tree, on, sizeof(*oid));
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}
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int oidtree_contains(struct oidtree *ot, const struct object_id *oid)
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{
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struct object_id k;
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size_t klen = sizeof(k);
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oidcpy_with_padding(&k, oid);
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if (oid->algo == GIT_HASH_UNKNOWN)
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klen -= sizeof(oid->algo);
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/* cb_lookup relies on memcmp on the struct, so order matters: */
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klen += BUILD_ASSERT_OR_ZERO(offsetof(struct object_id, hash) <
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offsetof(struct object_id, algo));
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return cb_lookup(&ot->tree, (const uint8_t *)&k, klen) ? 1 : 0;
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}
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static enum cb_next iter(struct cb_node *n, void *arg)
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{
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struct oidtree_iter_data *x = arg;
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const struct object_id *oid = (const struct object_id *)n->k;
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if (x->algo != GIT_HASH_UNKNOWN && x->algo != oid->algo)
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return CB_CONTINUE;
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if (x->last_nibble_at) {
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if ((oid->hash[*x->last_nibble_at] ^ x->last_byte) & 0xf0)
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return CB_CONTINUE;
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}
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return x->fn(oid, x->arg);
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}
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void oidtree_each(struct oidtree *ot, const struct object_id *oid,
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size_t oidhexsz, oidtree_iter fn, void *arg)
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{
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size_t klen = oidhexsz / 2;
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struct oidtree_iter_data x = { 0 };
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assert(oidhexsz <= GIT_MAX_HEXSZ);
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x.fn = fn;
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x.arg = arg;
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x.algo = oid->algo;
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if (oidhexsz & 1) {
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x.last_byte = oid->hash[klen];
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x.last_nibble_at = &klen;
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}
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cb_each(&ot->tree, (const uint8_t *)oid, klen, iter, &x);
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}
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