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v261
src/basic/hash-funcs.h
112 строк
6 KB
Daan De Meyer
tree-wide: Introduce sd-forward.h and shared-forward.h headers
16 окт 2025, 18:00
16 окт 2025, 18:00
f102bc3
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/* SPDX-License-Identifier: LGPL-2.1-or-later */ #pragma once #include "basic-forward.h" typedef void (*hash_func_t)(const void *p, struct siphash *state); typedef int (*compare_func_t)(const void *a, const void *b); struct hash_ops { hash_func_t hash; compare_func_t compare; free_func_t free_key; free_func_t free_value; }; #define _DEFINE_HASH_OPS(uq, name, type, hash_func, compare_func, free_key_func, free_value_func, scope) \ _unused_ static void (* UNIQ_T(static_hash_wrapper, uq))(const type *, struct siphash *) = hash_func; \ _unused_ static int (* UNIQ_T(static_compare_wrapper, uq))(const type *, const type *) = compare_func; \ scope const struct hash_ops name = { \ .hash = (hash_func_t) hash_func, \ .compare = (compare_func_t) compare_func, \ .free_key = free_key_func, \ .free_value = free_value_func, \ } #define _DEFINE_FREE_FUNC(uq, type, wrapper_name, func) \ /* Type-safe free function */ \ static void UNIQ_T(wrapper_name, uq)(void *a) { \ type *_a = a; \ func(_a); \ } #define _DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(uq, name, type, hash_func, compare_func, free_func, scope) \ _DEFINE_FREE_FUNC(uq, type, static_free_wrapper, free_func); \ _DEFINE_HASH_OPS(uq, name, type, hash_func, compare_func, \ UNIQ_T(static_free_wrapper, uq), NULL, scope) #define _DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(uq, name, type, hash_func, compare_func, type_value, free_func, scope) \ _DEFINE_FREE_FUNC(uq, type_value, static_free_wrapper, free_func); \ _DEFINE_HASH_OPS(uq, name, type, hash_func, compare_func, \ NULL, UNIQ_T(static_free_wrapper, uq), scope) #define _DEFINE_HASH_OPS_FULL(uq, name, type, hash_func, compare_func, free_key_func, type_value, free_value_func, scope) \ _DEFINE_FREE_FUNC(uq, type, static_free_key_wrapper, free_key_func); \ _DEFINE_FREE_FUNC(uq, type_value, static_free_value_wrapper, free_value_func); \ _DEFINE_HASH_OPS(uq, name, type, hash_func, compare_func, \ UNIQ_T(static_free_key_wrapper, uq), \ UNIQ_T(static_free_value_wrapper, uq), scope) #define DEFINE_HASH_OPS(name, type, hash_func, compare_func) \ _DEFINE_HASH_OPS(UNIQ, name, type, hash_func, compare_func, NULL, NULL,) #define DEFINE_PRIVATE_HASH_OPS(name, type, hash_func, compare_func) \ _DEFINE_HASH_OPS(UNIQ, name, type, hash_func, compare_func, NULL, NULL, static) #define DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(name, type, hash_func, compare_func, free_func) \ _DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(UNIQ, name, type, hash_func, compare_func, free_func,) #define DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(name, type, hash_func, compare_func, free_func) \ _DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(UNIQ, name, type, hash_func, compare_func, free_func, static) #define DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(name, type, hash_func, compare_func, value_type, free_func) \ _DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(UNIQ, name, type, hash_func, compare_func, value_type, free_func,) #define DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(name, type, hash_func, compare_func, value_type, free_func) \ _DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(UNIQ, name, type, hash_func, compare_func, value_type, free_func, static) #define DEFINE_HASH_OPS_FULL(name, type, hash_func, compare_func, free_key_func, value_type, free_value_func) \ _DEFINE_HASH_OPS_FULL(UNIQ, name, type, hash_func, compare_func, free_key_func, value_type, free_value_func,) #define DEFINE_PRIVATE_HASH_OPS_FULL(name, type, hash_func, compare_func, free_key_func, value_type, free_value_func) \ _DEFINE_HASH_OPS_FULL(UNIQ, name, type, hash_func, compare_func, free_key_func, value_type, free_value_func, static) void string_hash_func(const char *p, struct siphash *state); #define string_compare_func strcmp extern const struct hash_ops string_hash_ops; extern const struct hash_ops string_hash_ops_free; extern const struct hash_ops string_hash_ops_value_free; extern const struct hash_ops string_hash_ops_free_free; extern const struct hash_ops string_hash_ops_free_strv_free; void path_hash_func(const char *p, struct siphash *state); extern const struct hash_ops path_hash_ops; extern const struct hash_ops path_hash_ops_free; extern const struct hash_ops path_hash_ops_free_free; /* This will compare the passed pointers directly, and will not dereference them. This is hence not useful for strings * or suchlike. */ void trivial_hash_func(const void *p, struct siphash *state); int trivial_compare_func(const void *a, const void *b) _const_; extern const struct hash_ops trivial_hash_ops; extern const struct hash_ops trivial_hash_ops_free; extern const struct hash_ops trivial_hash_ops_value_free; extern const struct hash_ops trivial_hash_ops_free_free; /* 32-bit values we can always just embed in the pointer itself, but in order to support 32-bit archs we need store 64-bit * values indirectly, since they don't fit in a pointer. */ void uint64_hash_func(const uint64_t *p, struct siphash *state); int uint64_compare_func(const uint64_t *a, const uint64_t *b) _pure_; extern const struct hash_ops uint64_hash_ops; extern const struct hash_ops uint64_hash_ops_value_free; /* On some archs dev_t is 32-bit, and on others 64-bit. And sometimes it's 64-bit on 32-bit archs, and sometimes 32-bit on * 64-bit archs. Yuck! */ #if SIZEOF_DEV_T != 8 void devt_hash_func(const dev_t *p, struct siphash *state); #else #define devt_hash_func uint64_hash_func #endif int devt_compare_func(const dev_t *a, const dev_t *b) _pure_; extern const struct hash_ops devt_hash_ops;