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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)

/*
 * Generic non-thread safe hash map implementation.
 *
 * Copyright (c) 2019 Facebook
 */
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <linux/err.h>
#include "hashmap.h"

/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64

/* prevent accidental re-addition of reallocarray() */
#pragma GCC poison reallocarray

/* start with 4 buckets */
#define HASHMAP_MIN_CAP_BITS 2

static void hashmap_add_entry(struct hashmap_entry **pprev,
			      struct hashmap_entry *entry)
{
	entry->next = *pprev;
	*pprev = entry;
}

static void hashmap_del_entry(struct hashmap_entry **pprev,
			      struct hashmap_entry *entry)
{
	*pprev = entry->next;
	entry->next = NULL;
}

void hashmap__init(struct hashmap *map, hashmap_hash_fn hash_fn,
		   hashmap_equal_fn equal_fn, void *ctx)
{
	map->hash_fn = hash_fn;
	map->equal_fn = equal_fn;
	map->ctx = ctx;

	map->buckets = NULL;
	map->cap = 0;
	map->cap_bits = 0;
	map->sz = 0;
}

struct hashmap *hashmap__new(hashmap_hash_fn hash_fn,
			     hashmap_equal_fn equal_fn,
			     void *ctx)
{
	struct hashmap *map = malloc(sizeof(struct hashmap));

	if (!map)
		return ERR_PTR(-ENOMEM);
	hashmap__init(map, hash_fn, equal_fn, ctx);
	return map;
}

void hashmap__clear(struct hashmap *map)
{
	struct hashmap_entry *cur, *tmp;
	size_t bkt;

	hashmap__for_each_entry_safe(map, cur, tmp, bkt) {
		free(cur);
	}
	free(map->buckets);
	map->buckets = NULL;
	map->cap = map->cap_bits = map->sz = 0;
}

void hashmap__free(struct hashmap *map)
{
	if (IS_ERR_OR_NULL(map))
		return;

	hashmap__clear(map);
	free(map);
}

size_t hashmap__size(const struct hashmap *map)
{
	return map->sz;
}

size_t hashmap__capacity(const struct hashmap *map)
{
	return map->cap;
}

static bool hashmap_needs_to_grow(struct hashmap *map)
{
	/* grow if empty or more than 75% filled */
	return (map->cap == 0) || ((map->sz + 1) * 4 / 3 > map->cap);
}

static int hashmap_grow(struct hashmap *map)
{
	struct hashmap_entry **new_buckets;
	struct hashmap_entry *cur, *tmp;
	size_t new_cap_bits, new_cap;
	size_t h, bkt;

	new_cap_bits = map->cap_bits + 1;
	if (new_cap_bits < HASHMAP_MIN_CAP_BITS)
		new_cap_bits = HASHMAP_MIN_CAP_BITS;

	new_cap = 1UL << new_cap_bits;
	new_buckets = calloc(new_cap, sizeof(new_buckets[0]));
	if (!new_buckets)
		return -ENOMEM;

	hashmap__for_each_entry_safe(map, cur, tmp, bkt) {
		h = hash_bits(map->hash_fn(cur->key, map->ctx), new_cap_bits);
		hashmap_add_entry(&new_buckets[h], cur);
	}

	map->cap = new_cap;
	map->cap_bits = new_cap_bits;
	free(map->buckets);
	map->buckets = new_buckets;

	return 0;
}

static bool hashmap_find_entry(const struct hashmap *map,
			       const long key, size_t hash,
			       struct hashmap_entry ***pprev,
			       struct hashmap_entry **entry)
{
	struct hashmap_entry *cur, **prev_ptr;

	if (!map->buckets)
		return false;

	for (prev_ptr = &map->buckets[hash], cur = *prev_ptr;
	     cur;
	     prev_ptr = &cur->next, cur = cur->next) {
		if (map->equal_fn(cur->key, key, map->ctx)) {
			if (pprev)
				*pprev = prev_ptr;
			*entry = cur;
			return true;
		}
	}

	return false;
}

int hashmap_insert(struct hashmap *map, long key, long value,
		   enum hashmap_insert_strategy strategy,
		   long *old_key, long *old_value)
{
	struct hashmap_entry *entry;
	size_t h;
	int err;

	if (old_key)
		*old_key = 0;
	if (old_value)
		*old_value = 0;

	h = hash_bits(map->hash_fn(key, map->ctx), map->cap_bits);
	if (strategy != HASHMAP_APPEND &&
	    hashmap_find_entry(map, key, h, NULL, &entry)) {
		if (old_key)
			*old_key = entry->key;
		if (old_value)
			*old_value = entry->value;

		if (strategy == HASHMAP_SET || strategy == HASHMAP_UPDATE) {
			entry->key = key;
			entry->value = value;
			return 0;
		} else if (strategy == HASHMAP_ADD) {
			return -EEXIST;
		}
	}

	if (strategy == HASHMAP_UPDATE)
		return -ENOENT;

	if (hashmap_needs_to_grow(map)) {
		err = hashmap_grow(map);
		if (err)
			return err;
		h = hash_bits(map->hash_fn(key, map->ctx), map->cap_bits);
	}

	entry = malloc(sizeof(struct hashmap_entry));
	if (!entry)
		return -ENOMEM;

	entry->key = key;
	entry->value = value;
	hashmap_add_entry(&map->buckets[h], entry);
	map->sz++;

	return 0;
}

bool hashmap_find(const struct hashmap *map, long key, long *value)
{
	struct hashmap_entry *entry;
	size_t h;

	h = hash_bits(map->hash_fn(key, map->ctx), map->cap_bits);
	if (!hashmap_find_entry(map, key, h, NULL, &entry))
		return false;

	if (value)
		*value = entry->value;
	return true;
}

bool hashmap_delete(struct hashmap *map, long key,
		    long *old_key, long *old_value)
{
	struct hashmap_entry **pprev, *entry;
	size_t h;

	h = hash_bits(map->hash_fn(key, map->ctx), map->cap_bits);
	if (!hashmap_find_entry(map, key, h, &pprev, &entry))
		return false;

	if (old_key)
		*old_key = entry->key;
	if (old_value)
		*old_value = entry->value;

	hashmap_del_entry(pprev, entry);
	free(entry);
	map->sz--;

	return true;
}

Filemanager

DIR : / usr/ src/ kernels/ 5.14.0-611.49.2.el9_7.x86_64/ tools/ lib/ bpf/
Name Type Size Permission Actions
Build File 263 B 0644
Makefile File 10.9 KB 0644
bpf.c File 36.63 KB 0644
bpf.h File 24.87 KB 0644
bpf_core_read.h File 21.89 KB 0644
bpf_endian.h File 3.66 KB 0644
bpf_gen_internal.h File 2.17 KB 0644
bpf_helpers.h File 15.51 KB 0644
bpf_prog_linfo.c File 6.14 KB 0644
bpf_tracing.h File 32.87 KB 0644
btf.c File 142.89 KB 0644
btf.h File 19.99 KB 0644
btf_dump.c File 69.04 KB 0644
btf_iter.c File 4.05 KB 0644
btf_relocate.c File 14.32 KB 0644
elf.c File 13.48 KB 0644
features.c File 17.16 KB 0644
gen_loader.c File 37.52 KB 0644
hashmap.c File 4.92 KB 0644
hashmap.h File 6.74 KB 0644
libbpf.c File 375.66 KB 0644
libbpf.h File 73.26 KB 0644
libbpf.map File 8.86 KB 0644
libbpf.pc.template File 252 B 0644
libbpf_common.h File 3.36 KB 0644
libbpf_errno.c File 2.25 KB 0644
libbpf_internal.h File 19.59 KB 0644
libbpf_legacy.h File 5.07 KB 0644
libbpf_probes.c File 11.87 KB 0644
libbpf_version.h File 242 B 0644
linker.c File 76.81 KB 0644
netlink.c File 21.65 KB 0644
nlattr.c File 4.9 KB 0644
nlattr.h File 4.23 KB 0644
relo_core.c File 50.5 KB 0644
relo_core.h File 3.26 KB 0644
ringbuf.c File 15.86 KB 0644
skel_internal.h File 8.89 KB 0644
str_error.c File 1020 B 0644
str_error.h File 235 B 0644
strset.c File 4.28 KB 0644
strset.h File 586 B 0644
usdt.bpf.h File 8.31 KB 0644
usdt.c File 51.09 KB 0644
zip.c File 8.29 KB 0644
zip.h File 1.24 KB 0644