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zend_hash.h
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/* +----------------------------------------------------------------------+ | Zend Engine | +----------------------------------------------------------------------+ | Copyright (c) 1998-2013 Zend Technologies Ltd. (http://www.zend.com) | +----------------------------------------------------------------------+ | This source file is subject to version 2.00 of the Zend license, | | that is bundled with this package in the file LICENSE, and is | | available through the world-wide-web at the following url: | | http://www.zend.com/license/2_00.txt. | | If you did not receive a copy of the Zend license and are unable to | | obtain it through the world-wide-web, please send a note to | | license@zend.com so we can mail you a copy immediately. | +----------------------------------------------------------------------+ | Authors: Andi Gutmans <andi@zend.com> | | Zeev Suraski <zeev@zend.com> | +----------------------------------------------------------------------+ */ /* $Id$ */ #ifndef ZEND_HASH_H #define ZEND_HASH_H #include <sys/types.h> #include "zend.h" #define HASH_KEY_IS_STRING 1 #define HASH_KEY_IS_LONG 2 #define HASH_KEY_NON_EXISTANT 3 #define HASH_UPDATE (1<<0) #define HASH_ADD (1<<1) #define HASH_NEXT_INSERT (1<<2) #define HASH_DEL_KEY 0 #define HASH_DEL_INDEX 1 #define HASH_DEL_KEY_QUICK 2 #define HASH_UPDATE_KEY_IF_NONE 0 #define HASH_UPDATE_KEY_IF_BEFORE 1 #define HASH_UPDATE_KEY_IF_AFTER 2 #define HASH_UPDATE_KEY_ANYWAY 3 typedef ulong (*hash_func_t)(const char *arKey, uint nKeyLength); typedef int (*compare_func_t)(const void *, const void * TSRMLS_DC); typedef void (*sort_func_t)(void *, size_t, register size_t, compare_func_t TSRMLS_DC); typedef void (*dtor_func_t)(void *pDest); typedef void (*copy_ctor_func_t)(void *pElement); typedef void (*copy_ctor_param_func_t)(void *pElement, void *pParam); struct _hashtable; typedef struct bucket { ulong h; /* Used for numeric indexing */ uint nKeyLength; void *pData; void *pDataPtr; struct bucket *pListNext; struct bucket *pListLast; struct bucket *pNext; struct bucket *pLast; char arKey[1]; /* Must be last element */ } Bucket; typedef struct _hashtable { uint nTableSize; uint nTableMask; uint nNumOfElements; ulong nNextFreeElement; Bucket *pInternalPointer; /* Used for element traversal */ Bucket *pListHead; Bucket *pListTail; Bucket **arBuckets; dtor_func_t pDestructor; zend_bool persistent; unsigned char nApplyCount; zend_bool bApplyProtection; #if ZEND_DEBUG int inconsistent; #endif } HashTable; typedef struct _zend_hash_key { char *arKey; uint nKeyLength; ulong h; } zend_hash_key; typedef zend_bool (*merge_checker_func_t)(HashTable *target_ht, void *source_data, zend_hash_key *hash_key, void *pParam); typedef Bucket* HashPosition; BEGIN_EXTERN_C() /* startup/shutdown */ ZEND_API int _zend_hash_init(HashTable *ht, uint nSize, hash_func_t pHashFunction, dtor_func_t pDestructor, zend_bool persistent ZEND_FILE_LINE_DC); ZEND_API int _zend_hash_init_ex(HashTable *ht, uint nSize, hash_func_t pHashFunction, dtor_func_t pDestructor, zend_bool persistent, zend_bool bApplyProtection ZEND_FILE_LINE_DC); ZEND_API void zend_hash_destroy(HashTable *ht); ZEND_API void zend_hash_clean(HashTable *ht); #define zend_hash_init(ht, nSize, pHashFunction, pDestructor, persistent) _zend_hash_init((ht), (nSize), (pHashFunction), (pDestructor), (persistent) ZEND_FILE_LINE_CC) #define zend_hash_init_ex(ht, nSize, pHashFunction, pDestructor, persistent, bApplyProtection) _zend_hash_init_ex((ht), (nSize), (pHashFunction), (pDestructor), (persistent), (bApplyProtection) ZEND_FILE_LINE_CC) /* additions/updates/changes */ ZEND_API int _zend_hash_add_or_update(HashTable *ht, const char *arKey, uint nKeyLength, void *pData, uint nDataSize, void **pDest, int flag ZEND_FILE_LINE_DC); #define zend_hash_update(ht, arKey, nKeyLength, pData, nDataSize, pDest) \ _zend_hash_add_or_update(ht, arKey, nKeyLength, pData, nDataSize, pDest, HASH_UPDATE ZEND_FILE_LINE_CC) #define zend_hash_add(ht, arKey, nKeyLength, pData, nDataSize, pDest) \ _zend_hash_add_or_update(ht, arKey, nKeyLength, pData, nDataSize, pDest, HASH_ADD ZEND_FILE_LINE_CC) ZEND_API int _zend_hash_quick_add_or_update(HashTable *ht, const char *arKey, uint nKeyLength, ulong h, void *pData, uint nDataSize, void **pDest, int flag ZEND_FILE_LINE_DC); #define zend_hash_quick_update(ht, arKey, nKeyLength, h, pData, nDataSize, pDest) \ _zend_hash_quick_add_or_update(ht, arKey, nKeyLength, h, pData, nDataSize, pDest, HASH_UPDATE ZEND_FILE_LINE_CC) #define zend_hash_quick_add(ht, arKey, nKeyLength, h, pData, nDataSize, pDest) \ _zend_hash_quick_add_or_update(ht, arKey, nKeyLength, h, pData, nDataSize, pDest, HASH_ADD ZEND_FILE_LINE_CC) ZEND_API int _zend_hash_index_update_or_next_insert(HashTable *ht, ulong h, void *pData, uint nDataSize, void **pDest, int flag ZEND_FILE_LINE_DC); #define zend_hash_index_update(ht, h, pData, nDataSize, pDest) \ _zend_hash_index_update_or_next_insert(ht, h, pData, nDataSize, pDest, HASH_UPDATE ZEND_FILE_LINE_CC) #define zend_hash_next_index_insert(ht, pData, nDataSize, pDest) \ _zend_hash_index_update_or_next_insert(ht, 0, pData, nDataSize, pDest, HASH_NEXT_INSERT ZEND_FILE_LINE_CC) ZEND_API int zend_hash_add_empty_element(HashTable *ht, const char *arKey, uint nKeyLength); #define ZEND_HASH_APPLY_KEEP 0 #define ZEND_HASH_APPLY_REMOVE 1<<0 #define ZEND_HASH_APPLY_STOP 1<<1 typedef int (*apply_func_t)(void *pDest TSRMLS_DC); typedef int (*apply_func_arg_t)(void *pDest, void *argument TSRMLS_DC); typedef int (*apply_func_args_t)(void *pDest TSRMLS_DC, int num_args, va_list args, zend_hash_key *hash_key); ZEND_API void zend_hash_graceful_destroy(HashTable *ht); ZEND_API void zend_hash_graceful_reverse_destroy(HashTable *ht); ZEND_API void zend_hash_apply(HashTable *ht, apply_func_t apply_func TSRMLS_DC); ZEND_API void zend_hash_apply_with_argument(HashTable *ht, apply_func_arg_t apply_func, void * TSRMLS_DC); ZEND_API void zend_hash_apply_with_arguments(HashTable *ht TSRMLS_DC, apply_func_args_t apply_func, int, ...); /* This function should be used with special care (in other words, * it should usually not be used). When used with the ZEND_HASH_APPLY_STOP * return value, it assumes things about the order of the elements in the hash. * Also, it does not provide the same kind of reentrancy protection that * the standard apply functions do. */ ZEND_API void zend_hash_reverse_apply(HashTable *ht, apply_func_t apply_func TSRMLS_DC); /* Deletes */ ZEND_API int zend_hash_del_key_or_index(HashTable *ht, const char *arKey, uint nKeyLength, ulong h, int flag); #define zend_hash_del(ht, arKey, nKeyLength) \ zend_hash_del_key_or_index(ht, arKey, nKeyLength, 0, HASH_DEL_KEY) #define zend_hash_quick_del(ht, arKey, nKeyLength, h) \ zend_hash_del_key_or_index(ht, arKey, nKeyLength, h, HASH_DEL_KEY_QUICK) #define zend_hash_index_del(ht, h) \ zend_hash_del_key_or_index(ht, NULL, 0, h, HASH_DEL_INDEX) ZEND_API ulong zend_get_hash_value(const char *arKey, uint nKeyLength); /* Data retreival */ ZEND_API int zend_hash_find(const HashTable *ht, const char *arKey, uint nKeyLength, void **pData); ZEND_API int zend_hash_quick_find(const HashTable *ht, const char *arKey, uint nKeyLength, ulong h, void **pData); ZEND_API int zend_hash_index_find(const HashTable *ht, ulong h, void **pData); /* Misc */ ZEND_API int zend_hash_exists(const HashTable *ht, const char *arKey, uint nKeyLength); ZEND_API int zend_hash_quick_exists(const HashTable *ht, const char *arKey, uint nKeyLength, ulong h); ZEND_API int zend_hash_index_exists(const HashTable *ht, ulong h); ZEND_API ulong zend_hash_next_free_element(const HashTable *ht); /* traversing */ #define zend_hash_has_more_elements_ex(ht, pos) \ (zend_hash_get_current_key_type_ex(ht, pos) == HASH_KEY_NON_EXISTANT ? FAILURE : SUCCESS) ZEND_API int zend_hash_move_forward_ex(HashTable *ht, HashPosition *pos); ZEND_API int zend_hash_move_backwards_ex(HashTable *ht, HashPosition *pos); ZEND_API int zend_hash_get_current_key_ex(const HashTable *ht, char **str_index, uint *str_length, ulong *num_index, zend_bool duplicate, HashPosition *pos); ZEND_API int zend_hash_get_current_key_type_ex(HashTable *ht, HashPosition *pos); ZEND_API int zend_hash_get_current_data_ex(HashTable *ht, void **pData, HashPosition *pos); ZEND_API void zend_hash_internal_pointer_reset_ex(HashTable *ht, HashPosition *pos); ZEND_API void zend_hash_internal_pointer_end_ex(HashTable *ht, HashPosition *pos); ZEND_API int zend_hash_update_current_key_ex(HashTable *ht, int key_type, const char *str_index, uint str_length, ulong num_index, int mode, HashPosition *pos); typedef struct _HashPointer { HashPosition pos; ulong h; } HashPointer; ZEND_API int zend_hash_get_pointer(const HashTable *ht, HashPointer *ptr); ZEND_API int zend_hash_set_pointer(HashTable *ht, const HashPointer *ptr); #define zend_hash_has_more_elements(ht) \ zend_hash_has_more_elements_ex(ht, NULL) #define zend_hash_move_forward(ht) \ zend_hash_move_forward_ex(ht, NULL) #define zend_hash_move_backwards(ht) \ zend_hash_move_backwards_ex(ht, NULL) #define zend_hash_get_current_key(ht, str_index, num_index, duplicate) \ zend_hash_get_current_key_ex(ht, str_index, NULL, num_index, duplicate, NULL) #define zend_hash_get_current_key_type(ht) \ zend_hash_get_current_key_type_ex(ht, NULL) #define zend_hash_get_current_data(ht, pData) \ zend_hash_get_current_data_ex(ht, pData, NULL) #define zend_hash_internal_pointer_reset(ht) \ zend_hash_internal_pointer_reset_ex(ht, NULL) #define zend_hash_internal_pointer_end(ht) \ zend_hash_internal_pointer_end_ex(ht, NULL) #define zend_hash_update_current_key(ht, key_type, str_index, str_length, num_index) \ zend_hash_update_current_key_ex(ht, key_type, str_index, str_length, num_index, HASH_UPDATE_KEY_ANYWAY, NULL) /* Copying, merging and sorting */ ZEND_API void zend_hash_copy(HashTable *target, HashTable *source, copy_ctor_func_t pCopyConstructor, void *tmp, uint size); ZEND_API void _zend_hash_merge(HashTable *target, HashTable *source, copy_ctor_func_t pCopyConstructor, void *tmp, uint size, int overwrite ZEND_FILE_LINE_DC); ZEND_API void zend_hash_merge_ex(HashTable *target, HashTable *source, copy_ctor_func_t pCopyConstructor, uint size, merge_checker_func_t pMergeSource, void *pParam); ZEND_API int zend_hash_sort(HashTable *ht, sort_func_t sort_func, compare_func_t compare_func, int renumber TSRMLS_DC); ZEND_API int zend_hash_compare(HashTable *ht1, HashTable *ht2, compare_func_t compar, zend_bool ordered TSRMLS_DC); ZEND_API int zend_hash_minmax(const HashTable *ht, compare_func_t compar, int flag, void **pData TSRMLS_DC); #define zend_hash_merge(target, source, pCopyConstructor, tmp, size, overwrite) \ _zend_hash_merge(target, source, pCopyConstructor, tmp, size, overwrite ZEND_FILE_LINE_CC) ZEND_API int zend_hash_num_elements(const HashTable *ht); ZEND_API int zend_hash_rehash(HashTable *ht); /* * DJBX33A (Daniel J. Bernstein, Times 33 with Addition) * * This is Daniel J. Bernstein's popular `times 33' hash function as * posted by him years ago on comp.lang.c. It basically uses a function * like ``hash(i) = hash(i-1) * 33 + str[i]''. This is one of the best * known hash functions for strings. Because it is both computed very * fast and distributes very well. * * The magic of number 33, i.e. why it works better than many other * constants, prime or not, has never been adequately explained by * anyone. So I try an explanation: if one experimentally tests all * multipliers between 1 and 256 (as RSE did now) one detects that even * numbers are not useable at all. The remaining 128 odd numbers * (except for the number 1) work more or less all equally well. They * all distribute in an acceptable way and this way fill a hash table * with an average percent of approx. 86%. * * If one compares the Chi^2 values of the variants, the number 33 not * even has the best value. But the number 33 and a few other equally * good numbers like 17, 31, 63, 127 and 129 have nevertheless a great * advantage to the remaining numbers in the large set of possible * multipliers: their multiply operation can be replaced by a faster * operation based on just one shift plus either a single addition * or subtraction operation. And because a hash function has to both * distribute good _and_ has to be very fast to compute, those few * numbers should be preferred and seems to be the reason why Daniel J. * Bernstein also preferred it. * * * -- Ralf S. Engelschall <rse@engelschall.com> */ static inline ulong zend_inline_hash_func(const char *arKey, uint nKeyLength) { register ulong hash = 5381; /* variant with the hash unrolled eight times */ for (; nKeyLength >= 8; nKeyLength -= 8) { hash = ((hash << 5) + hash) + *arKey++; hash = ((hash << 5) + hash) + *arKey++; hash = ((hash << 5) + hash) + *arKey++; hash = ((hash << 5) + hash) + *arKey++; hash = ((hash << 5) + hash) + *arKey++; hash = ((hash << 5) + hash) + *arKey++; hash = ((hash << 5) + hash) + *arKey++; hash = ((hash << 5) + hash) + *arKey++; } switch (nKeyLength) { case 7: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */ case 6: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */ case 5: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */ case 4: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */ case 3: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */ case 2: hash = ((hash << 5) + hash) + *arKey++; /* fallthrough... */ case 1: hash = ((hash << 5) + hash) + *arKey++; break; case 0: break; EMPTY_SWITCH_DEFAULT_CASE() } return hash; } ZEND_API ulong zend_hash_func(const char *arKey, uint nKeyLength); #if ZEND_DEBUG /* debug */ void zend_hash_display_pListTail(const HashTable *ht); void zend_hash_display(const HashTable *ht); #endif END_EXTERN_C() #define ZEND_INIT_SYMTABLE(ht) \ ZEND_INIT_SYMTABLE_EX(ht, 2, 0) #define ZEND_INIT_SYMTABLE_EX(ht, n, persistent) \ zend_hash_init(ht, n, NULL, ZVAL_PTR_DTOR, persistent) #define ZEND_HANDLE_NUMERIC(key, length, func) do { \ register const char *tmp = key; \ \ if (*tmp == '-') { \ tmp++; \ } \ if (*tmp >= '0' && *tmp <= '9') { /* possibly a numeric index */ \ const char *end = key + length - 1; \ ulong idx; \ \ if ((*end != '\0') /* not a null terminated string */ \ || (*tmp == '0' && length > 2) /* numbers with leading zeros */ \ || (end - tmp > MAX_LENGTH_OF_LONG - 1) /* number too long */ \ || (SIZEOF_LONG == 4 && \ end - tmp == MAX_LENGTH_OF_LONG - 1 && \ *tmp > '2')) { /* overflow */ \ break; \ } \ idx = (*tmp - '0'); \ while (++tmp != end && *tmp >= '0' && *tmp <= '9') { \ idx = (idx * 10) + (*tmp - '0'); \ } \ if (tmp == end) { \ if (*key == '-') { \ if (idx-1 > LONG_MAX) { /* overflow */ \ break; \ } \ idx = 0 - idx; \ } else if (idx > LONG_MAX) { /* overflow */ \ break; \ } \ return func; \ } \ } \ } while (0) static inline int zend_symtable_update(HashTable *ht, const char *arKey, uint nKeyLength, void *pData, uint nDataSize, void **pDest) \ { ZEND_HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_update(ht, idx, pData, nDataSize, pDest)); return zend_hash_update(ht, arKey, nKeyLength, pData, nDataSize, pDest); } static inline int zend_symtable_del(HashTable *ht, const char *arKey, uint nKeyLength) { ZEND_HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_del(ht, idx)); return zend_hash_del(ht, arKey, nKeyLength); } static inline int zend_symtable_find(HashTable *ht, const char *arKey, uint nKeyLength, void **pData) { ZEND_HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_find(ht, idx, pData)); return zend_hash_find(ht, arKey, nKeyLength, pData); } static inline int zend_symtable_exists(HashTable *ht, const char *arKey, uint nKeyLength) { ZEND_HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_index_exists(ht, idx)); return zend_hash_exists(ht, arKey, nKeyLength); } static inline int zend_symtable_update_current_key_ex(HashTable *ht, const char *arKey, uint nKeyLength, int mode, HashPosition *pos) { ZEND_HANDLE_NUMERIC(arKey, nKeyLength, zend_hash_update_current_key_ex(ht, HASH_KEY_IS_LONG, NULL, 0, idx, mode, pos)); return zend_hash_update_current_key_ex(ht, HASH_KEY_IS_STRING, arKey, nKeyLength, 0, mode, pos); } #define zend_symtable_update_current_key(ht,arKey,nKeyLength,mode) \ zend_symtable_update_current_key_ex(ht, arKey, nKeyLength, mode, NULL) #endif /* ZEND_HASH_H */ /* * Local variables: * tab-width: 4 * c-basic-offset: 4 * indent-tabs-mode: t * End: */