/src/php-src/Zend/zend_hash.c

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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 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@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

#include "zend.h"
#include "zend_globals.h"
#include "zend_variables.h"

#if defined(__aarch64__) || defined(_M_ARM64)
# include <arm_neon.h>
#endif

/* Prefer to use AVX2 instructions for better latency and throughput */
#if defined(__AVX2__)
# include <immintrin.h>
#elif defined( __SSE2__)
# include <emmintrin.h>
#endif

#if ZEND_DEBUG
# define HT_ASSERT(ht, expr) \
  ZEND_ASSERT((expr) || (HT_FLAGS(ht) & HASH_FLAG_ALLOW_COW_VIOLATION))
#else
# define HT_ASSERT(ht, expr)
#endif

#define HT_ASSERT_RC1(ht) HT_ASSERT(ht, GC_REFCOUNT(ht) == 1)

#define HT_POISONED_PTR ((HashTable *) (intptr_t) -1)

#if ZEND_DEBUG

#define HT_OK         0x00
#define HT_IS_DESTROYING    0x01
#define HT_DESTROYED      0x02
#define HT_CLEANING       0x03

static void _zend_is_inconsistent(const HashTable *ht, const char *file, int line)
{
  if ((HT_FLAGS(ht) & HASH_FLAG_CONSISTENCY) == HT_OK) {
    return;
  }
  switch (HT_FLAGS(ht) & HASH_FLAG_CONSISTENCY) {
    case HT_IS_DESTROYING:
      zend_output_debug_string(1, "%s(%d) : ht=%p is being destroyed", file, line, ht);
      break;
    case HT_DESTROYED:
      zend_output_debug_string(1, "%s(%d) : ht=%p is already destroyed", file, line, ht);
      break;
    case HT_CLEANING:
      zend_output_debug_string(1, "%s(%d) : ht=%p is being cleaned", file, line, ht);
      break;
    default:
      zend_output_debug_string(1, "%s(%d) : ht=%p is inconsistent", file, line, ht);
      break;
  }
  ZEND_UNREACHABLE();
}
#define IS_CONSISTENT(a) _zend_is_inconsistent(a, __FILE__, __LINE__);
#define SET_INCONSISTENT(n) do { \
    HT_FLAGS(ht) = (HT_FLAGS(ht) & ~HASH_FLAG_CONSISTENCY) | (n); \
  } while (0)
#else
#define IS_CONSISTENT(a)
#define SET_INCONSISTENT(n)
#endif

#define ZEND_HASH_IF_FULL_DO_RESIZE(ht)       \
  if ((ht)->nNumUsed >= (ht)->nTableSize) {   \
    zend_hash_do_resize(ht);          \
  }

ZEND_API void *zend_hash_str_find_ptr_lc(const HashTable *ht, const char *str, size_t len) {
  void *result;
  char *lc_str;

  /* Stack allocate small strings to improve performance */
  ALLOCA_FLAG(use_heap)

  lc_str = zend_str_tolower_copy(do_alloca(len + 1, use_heap), str, len);
  result = zend_hash_str_find_ptr(ht, lc_str, len);
  free_alloca(lc_str, use_heap);

  return result;
}

ZEND_API void *zend_hash_find_ptr_lc(const HashTable *ht, zend_string *key) {
  void *result;
  zend_string *lc_key = zend_string_tolower(key);
  result = zend_hash_find_ptr(ht, lc_key);
  zend_string_release(lc_key);
  return result;
}

static void ZEND_FASTCALL zend_hash_do_resize(HashTable *ht);

static zend_always_inline uint32_t zend_hash_check_size(uint32_t nSize)
{
#ifdef ZEND_WIN32
  unsigned long index;
#endif

  /* Use big enough power of 2 */
  /* size should be between HT_MIN_SIZE and HT_MAX_SIZE */
  if (nSize <= HT_MIN_SIZE) {
    return HT_MIN_SIZE;
  } else if (UNEXPECTED(nSize > HT_MAX_SIZE)) {
    zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%u * %zu + %zu)", nSize, sizeof(Bucket), sizeof(Bucket));
  }

#ifdef ZEND_WIN32
  if (BitScanReverse(&index, nSize - 1)) {
    return 0x2u << ((31 - index) ^ 0x1f);
  } else {
    /* nSize is ensured to be in the valid range, fall back to it
       rather than using an undefined bis scan result. */
    return nSize;
  }
#elif (defined(__GNUC__) || __has_builtin(__builtin_clz))  && defined(PHP_HAVE_BUILTIN_CLZ)
  return 0x2u << (__builtin_clz(nSize - 1) ^ 0x1f);
#else
  nSize -= 1;
  nSize |= (nSize >> 1);
  nSize |= (nSize >> 2);
  nSize |= (nSize >> 4);
  nSize |= (nSize >> 8);
  nSize |= (nSize >> 16);
  return nSize + 1;
#endif
}

static zend_always_inline void zend_hash_real_init_packed_ex(HashTable *ht)
{
  void *data;

  if (UNEXPECTED(GC_FLAGS(ht) & IS_ARRAY_PERSISTENT)) {
    data = pemalloc(HT_PACKED_SIZE_EX(ht->nTableSize, HT_MIN_MASK), 1);
  } else if (EXPECTED(ht->nTableSize == HT_MIN_SIZE)) {
    /* Use specialized API with constant allocation amount for a particularly common case. */
    data = emalloc(HT_PACKED_SIZE_EX(HT_MIN_SIZE, HT_MIN_MASK));
  } else {
    data = emalloc(HT_PACKED_SIZE_EX(ht->nTableSize, HT_MIN_MASK));
  }
  HT_SET_DATA_ADDR(ht, data);
  /* Don't overwrite iterator count. */
  ht->u.v.flags = HASH_FLAG_PACKED | HASH_FLAG_STATIC_KEYS;
  HT_HASH_RESET_PACKED(ht);
}

static zend_always_inline void zend_hash_real_init_mixed_ex(HashTable *ht)
{
  void *data;
  uint32_t nSize = ht->nTableSize;

  ZEND_ASSERT(HT_SIZE_TO_MASK(nSize));

  if (UNEXPECTED(GC_FLAGS(ht) & IS_ARRAY_PERSISTENT)) {
    data = pemalloc(HT_SIZE_EX(nSize, HT_SIZE_TO_MASK(nSize)), 1);
  } else if (EXPECTED(nSize == HT_MIN_SIZE)) {
    data = emalloc(HT_SIZE_EX(HT_MIN_SIZE, HT_SIZE_TO_MASK(HT_MIN_SIZE)));
    ht->nTableMask = HT_SIZE_TO_MASK(HT_MIN_SIZE);
    HT_SET_DATA_ADDR(ht, data);
    /* Don't overwrite iterator count. */
    ht->u.v.flags = HASH_FLAG_STATIC_KEYS;
#if defined(__AVX2__)
    do {
      __m256i ymm0 = _mm256_setzero_si256();
      ymm0 = _mm256_cmpeq_epi64(ymm0, ymm0);
      _mm256_storeu_si256((__m256i*)&HT_HASH_EX(data,  0), ymm0);
      _mm256_storeu_si256((__m256i*)&HT_HASH_EX(data,  8), ymm0);
    } while(0);
#elif defined (__SSE2__)
    do {
      __m128i xmm0 = _mm_setzero_si128();
      xmm0 = _mm_cmpeq_epi8(xmm0, xmm0);
      _mm_storeu_si128((__m128i*)&HT_HASH_EX(data,  0), xmm0);
      _mm_storeu_si128((__m128i*)&HT_HASH_EX(data,  4), xmm0);
      _mm_storeu_si128((__m128i*)&HT_HASH_EX(data,  8), xmm0);
      _mm_storeu_si128((__m128i*)&HT_HASH_EX(data, 12), xmm0);
    } while (0);
#elif defined(__aarch64__) || defined(_M_ARM64)
    do {
      int32x4_t t = vdupq_n_s32(-1);
      vst1q_s32((int32_t*)&HT_HASH_EX(data,  0), t);
      vst1q_s32((int32_t*)&HT_HASH_EX(data,  4), t);
      vst1q_s32((int32_t*)&HT_HASH_EX(data,  8), t);
      vst1q_s32((int32_t*)&HT_HASH_EX(data, 12), t);
    } while (0);
#else
    HT_HASH_EX(data,  0) = -1;
    HT_HASH_EX(data,  1) = -1;
    HT_HASH_EX(data,  2) = -1;
    HT_HASH_EX(data,  3) = -1;
    HT_HASH_EX(data,  4) = -1;
    HT_HASH_EX(data,  5) = -1;
    HT_HASH_EX(data,  6) = -1;
    HT_HASH_EX(data,  7) = -1;
    HT_HASH_EX(data,  8) = -1;
    HT_HASH_EX(data,  9) = -1;
    HT_HASH_EX(data, 10) = -1;
    HT_HASH_EX(data, 11) = -1;
    HT_HASH_EX(data, 12) = -1;
    HT_HASH_EX(data, 13) = -1;
    HT_HASH_EX(data, 14) = -1;
    HT_HASH_EX(data, 15) = -1;
#endif
    return;
  } else {
    data = emalloc(HT_SIZE_EX(nSize, HT_SIZE_TO_MASK(nSize)));
  }
  ht->nTableMask = HT_SIZE_TO_MASK(nSize);
  HT_SET_DATA_ADDR(ht, data);
  HT_FLAGS(ht) = HASH_FLAG_STATIC_KEYS;
  HT_HASH_RESET(ht);
}

static zend_always_inline void zend_hash_real_init_ex(HashTable *ht, bool packed)
{
  HT_ASSERT_RC1(ht);
  ZEND_ASSERT(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED);
  if (packed) {
    zend_hash_real_init_packed_ex(ht);
  } else {
    zend_hash_real_init_mixed_ex(ht);
  }
}

static const uint32_t uninitialized_bucket[-HT_MIN_MASK] =
  {HT_INVALID_IDX, HT_INVALID_IDX};

ZEND_API const HashTable zend_empty_array = {
  .gc.refcount = 2,
  .gc.u.type_info = IS_ARRAY | (GC_IMMUTABLE << GC_FLAGS_SHIFT),
  .u.flags = HASH_FLAG_UNINITIALIZED,
  .nTableMask = HT_MIN_MASK,
  {.arData = (Bucket*)&uninitialized_bucket[2]},
  .nNumUsed = 0,
  .nNumOfElements = 0,
  .nTableSize = HT_MIN_SIZE,
  .nInternalPointer = 0,
  .nNextFreeElement = ZEND_LONG_MIN,
  .pDestructor = ZVAL_PTR_DTOR
};

static zend_always_inline void _zend_hash_init_int(HashTable *ht, uint32_t nSize, dtor_func_t pDestructor, bool persistent)
{
  GC_SET_REFCOUNT(ht, 1);
  GC_TYPE_INFO(ht) = GC_ARRAY | (persistent ? ((GC_PERSISTENT|GC_NOT_COLLECTABLE) << GC_FLAGS_SHIFT) : 0);
  HT_FLAGS(ht) = HASH_FLAG_UNINITIALIZED;
  ht->nTableMask = HT_MIN_MASK;
  HT_SET_DATA_ADDR(ht, &uninitialized_bucket);
  ht->nNumUsed = 0;
  ht->nNumOfElements = 0;
  ht->nInternalPointer = 0;
  ht->nNextFreeElement = ZEND_LONG_MIN;
  ht->pDestructor = pDestructor;
  ht->nTableSize = zend_hash_check_size(nSize);
}

ZEND_API void ZEND_FASTCALL _zend_hash_init(HashTable *ht, uint32_t nSize, dtor_func_t pDestructor, bool persistent)
{
  _zend_hash_init_int(ht, nSize, pDestructor, persistent);
}

ZEND_API HashTable* ZEND_FASTCALL _zend_new_array_0(void)
{
  HashTable *ht = emalloc(sizeof(HashTable));
  _zend_hash_init_int(ht, HT_MIN_SIZE, ZVAL_PTR_DTOR, 0);
  return ht;
}

ZEND_API HashTable* ZEND_FASTCALL _zend_new_array(uint32_t nSize)
{
  HashTable *ht = emalloc(sizeof(HashTable));
  _zend_hash_init_int(ht, nSize, ZVAL_PTR_DTOR, 0);
  return ht;
}

ZEND_API HashTable* ZEND_FASTCALL zend_new_pair(const zval *val1, const zval *val2)
{
  zval *zv;
  HashTable *ht = emalloc(sizeof(HashTable));
  _zend_hash_init_int(ht, HT_MIN_SIZE, ZVAL_PTR_DTOR, 0);
  ht->nNumUsed = ht->nNumOfElements = ht->nNextFreeElement = 2;
  zend_hash_real_init_packed_ex(ht);

  zv = ht->arPacked;
  ZVAL_COPY_VALUE(zv, val1);
  zv++;
  ZVAL_COPY_VALUE(zv, val2);
  return ht;
}

ZEND_API void ZEND_FASTCALL zend_hash_packed_grow(HashTable *ht)
{
  HT_ASSERT_RC1(ht);
  if (ht->nTableSize >= HT_MAX_SIZE) {
    zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%u * %zu + %zu)", ht->nTableSize * 2, sizeof(Bucket), sizeof(Bucket));
  }
  uint32_t newTableSize = ht->nTableSize * 2;
  HT_SET_DATA_ADDR(ht, perealloc2(HT_GET_DATA_ADDR(ht), HT_PACKED_SIZE_EX(newTableSize, HT_MIN_MASK), HT_PACKED_USED_SIZE(ht), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT));
  ht->nTableSize = newTableSize;
}

ZEND_API void ZEND_FASTCALL zend_hash_real_init(HashTable *ht, bool packed)
{
  IS_CONSISTENT(ht);

  HT_ASSERT_RC1(ht);
  zend_hash_real_init_ex(ht, packed);
}

ZEND_API void ZEND_FASTCALL zend_hash_real_init_packed(HashTable *ht)
{
  IS_CONSISTENT(ht);

  HT_ASSERT_RC1(ht);
  zend_hash_real_init_packed_ex(ht);
}

ZEND_API void ZEND_FASTCALL zend_hash_real_init_mixed(HashTable *ht)
{
  IS_CONSISTENT(ht);

  HT_ASSERT_RC1(ht);
  zend_hash_real_init_mixed_ex(ht);
}

ZEND_API void ZEND_FASTCALL zend_hash_packed_to_hash(HashTable *ht)
{
  void *new_data, *old_data = HT_GET_DATA_ADDR(ht);
  zval *src = ht->arPacked;
  Bucket *dst;
  uint32_t i;
  uint32_t nSize = ht->nTableSize;

  ZEND_ASSERT(HT_SIZE_TO_MASK(nSize));

  HT_ASSERT_RC1(ht);
  // Alloc before assign to avoid inconsistencies on OOM
  new_data = pemalloc(HT_SIZE_EX(nSize, HT_SIZE_TO_MASK(nSize)), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
  HT_FLAGS(ht) &= ~HASH_FLAG_PACKED;
  ht->nTableMask = HT_SIZE_TO_MASK(ht->nTableSize);
  HT_SET_DATA_ADDR(ht, new_data);
  dst = ht->arData;
  for (i = 0; i < ht->nNumUsed; i++) {
    ZVAL_COPY_VALUE(&dst->val, src);
    dst->h = i;
    dst->key = NULL;
    dst++;
    src++;
  }
  pefree(old_data, GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
  zend_hash_rehash(ht);
}

ZEND_API void ZEND_FASTCALL zend_hash_to_packed(HashTable *ht)
{
  void *new_data, *old_data = HT_GET_DATA_ADDR(ht);
  Bucket *src = ht->arData;
  zval *dst;
  uint32_t i;

  HT_ASSERT_RC1(ht);
  new_data = pemalloc(HT_PACKED_SIZE_EX(ht->nTableSize, HT_MIN_MASK), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
  HT_FLAGS(ht) |= HASH_FLAG_PACKED | HASH_FLAG_STATIC_KEYS;
  ht->nTableMask = HT_MIN_MASK;
  HT_SET_DATA_ADDR(ht, new_data);
  HT_HASH_RESET_PACKED(ht);
  dst = ht->arPacked;
  for (i = 0; i < ht->nNumUsed; i++) {
    ZVAL_COPY_VALUE(dst, &src->val);
    dst++;
    src++;
  }
  pefree(old_data, GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
}

ZEND_API void ZEND_FASTCALL zend_hash_extend(HashTable *ht, uint32_t nSize, bool packed)
{
  HT_ASSERT_RC1(ht);

  if (nSize == 0) return;

  ZEND_ASSERT(HT_SIZE_TO_MASK(nSize));

  if (UNEXPECTED(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
    if (nSize > ht->nTableSize) {
      ht->nTableSize = zend_hash_check_size(nSize);
    }
    zend_hash_real_init(ht, packed);
  } else {
    if (packed) {
      ZEND_ASSERT(HT_IS_PACKED(ht));
      if (nSize > ht->nTableSize) {
        uint32_t newTableSize = zend_hash_check_size(nSize);
        HT_SET_DATA_ADDR(ht, perealloc2(HT_GET_DATA_ADDR(ht), HT_PACKED_SIZE_EX(newTableSize, HT_MIN_MASK), HT_PACKED_USED_SIZE(ht), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT));
        ht->nTableSize = newTableSize;
      }
    } else {
      ZEND_ASSERT(!HT_IS_PACKED(ht));
      if (nSize > ht->nTableSize) {
        void *new_data, *old_data = HT_GET_DATA_ADDR(ht);
        Bucket *old_buckets = ht->arData;
        nSize = zend_hash_check_size(nSize);
        new_data = pemalloc(HT_SIZE_EX(nSize, HT_SIZE_TO_MASK(nSize)), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
        ht->nTableSize = nSize;
        ht->nTableMask = HT_SIZE_TO_MASK(ht->nTableSize);
        HT_SET_DATA_ADDR(ht, new_data);
        memcpy(ht->arData, old_buckets, sizeof(Bucket) * ht->nNumUsed);
        pefree(old_data, GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
        zend_hash_rehash(ht);
      }
    }
  }
}

ZEND_API void ZEND_FASTCALL zend_hash_discard(HashTable *ht, uint32_t nNumUsed)
{
  Bucket *p, *end, *arData;
  uint32_t nIndex;

  ZEND_ASSERT(!HT_IS_PACKED(ht));
  arData = ht->arData;
  p = arData + ht->nNumUsed;
  end = arData + nNumUsed;
  ht->nNumUsed = nNumUsed;
  while (p != end) {
    p--;
    if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
    ht->nNumOfElements--;
    /* Collision pointers always directed from higher to lower buckets */
#if 0
    if (!(Z_NEXT(p->val) == HT_INVALID_IDX || HT_HASH_TO_BUCKET_EX(arData, Z_NEXT(p->val)) < p)) {
      abort();
    }
#endif
    nIndex = p->h | ht->nTableMask;
    HT_HASH_EX(arData, nIndex) = Z_NEXT(p->val);
  }
}

static uint32_t zend_array_recalc_elements(const HashTable *ht)
{
  zval *val;
  uint32_t num = ht->nNumOfElements;

  ZEND_HASH_MAP_FOREACH_VAL(ht, val) {
    if (Z_TYPE_P(val) == IS_INDIRECT) {
      if (UNEXPECTED(Z_TYPE_P(Z_INDIRECT_P(val)) == IS_UNDEF)) {
        num--;
      }
    }
  } ZEND_HASH_FOREACH_END();
  return num;
}
/* }}} */

ZEND_API uint32_t zend_array_count(HashTable *ht)
{
  uint32_t num;
  if (UNEXPECTED(HT_FLAGS(ht) & HASH_FLAG_HAS_EMPTY_IND)) {
    num = zend_array_recalc_elements(ht);
    if (UNEXPECTED(ht->nNumOfElements == num)) {
      HT_FLAGS(ht) &= ~HASH_FLAG_HAS_EMPTY_IND;
    }
  } else if (UNEXPECTED(ht == &EG(symbol_table))) {
    num = zend_array_recalc_elements(ht);
  } else {
    num = zend_hash_num_elements(ht);
  }
  return num;
}
/* }}} */

static zend_always_inline HashPosition _zend_hash_get_valid_pos(const HashTable *ht, HashPosition pos)
{
  if (HT_IS_PACKED(ht)) {
    while (pos < ht->nNumUsed && Z_ISUNDEF(ht->arPacked[pos])) {
      pos++;
    }
  } else {
    while (pos < ht->nNumUsed && Z_ISUNDEF(ht->arData[pos].val)) {
      pos++;
    }
  }
  return pos;
}

static zend_always_inline HashPosition _zend_hash_get_current_pos(const HashTable *ht)
{
  return _zend_hash_get_valid_pos(ht, ht->nInternalPointer);
}

ZEND_API HashPosition ZEND_FASTCALL zend_hash_get_current_pos(const HashTable *ht)
{
  return _zend_hash_get_current_pos(ht);
}

ZEND_API HashPosition ZEND_FASTCALL zend_hash_get_current_pos_ex(const HashTable *ht, HashPosition pos)
{
  return _zend_hash_get_valid_pos(ht, pos);
}

static void zend_hash_remove_iterator_copies(uint32_t idx) {
  HashTableIterator *iterators = EG(ht_iterators);

  HashTableIterator *iter = iterators + idx;
  uint32_t next_idx = iter->next_copy;
  while (next_idx != idx) {
    uint32_t cur_idx = next_idx;
    HashTableIterator *cur_iter = iterators + cur_idx;
    next_idx = cur_iter->next_copy;
    cur_iter->next_copy = cur_idx; // avoid recursion in zend_hash_iterator_del
    zend_hash_iterator_del(cur_idx);
  }
  iter->next_copy = idx;
}

ZEND_API uint32_t ZEND_FASTCALL zend_hash_iterator_add(HashTable *ht, HashPosition pos)
{
  HashTableIterator *iter = EG(ht_iterators);
  HashTableIterator *end  = iter + EG(ht_iterators_count);
  uint32_t idx;

  if (EXPECTED(!HT_ITERATORS_OVERFLOW(ht))) {
    HT_INC_ITERATORS_COUNT(ht);
  }
  while (iter != end) {
    if (iter->ht == NULL) {
      iter->ht = ht;
      iter->pos = pos;
      idx = iter - EG(ht_iterators);
      iter->next_copy = idx;
      if (idx + 1 > EG(ht_iterators_used)) {
        EG(ht_iterators_used) = idx + 1;
      }
      return idx;
    }
    iter++;
  }
  if (EG(ht_iterators) == EG(ht_iterators_slots)) {
    EG(ht_iterators) = emalloc(sizeof(HashTableIterator) * (EG(ht_iterators_count) + 8));
    memcpy(EG(ht_iterators), EG(ht_iterators_slots), sizeof(HashTableIterator) * EG(ht_iterators_count));
  } else {
    EG(ht_iterators) = erealloc(EG(ht_iterators), sizeof(HashTableIterator) * (EG(ht_iterators_count) + 8));
  }
  iter = EG(ht_iterators) + EG(ht_iterators_count);
  EG(ht_iterators_count) += 8;
  iter->ht = ht;
  iter->pos = pos;
  memset(iter + 1, 0, sizeof(HashTableIterator) * 7);
  idx = iter - EG(ht_iterators);
  iter->next_copy = idx;
  EG(ht_iterators_used) = idx + 1;
  return idx;
}

// To avoid losing track of the HashTable when separating arrays, we track all copies at once.
static zend_always_inline bool zend_hash_iterator_find_copy_pos(uint32_t idx, HashTable *ht) {
  HashTableIterator *iter = EG(ht_iterators) + idx;

  uint32_t next_idx = iter->next_copy;
  if (EXPECTED(next_idx != idx)) {
    HashTableIterator *copy_iter;
    while (next_idx != idx) {
      copy_iter = EG(ht_iterators) + next_idx;
      if (copy_iter->ht == ht) {
        // We have found the hashtable we are actually iterating over
        // Now clean any intermittent copies and replace the original index by the found one
        if (EXPECTED(iter->ht) && EXPECTED(iter->ht != HT_POISONED_PTR)
          && EXPECTED(!HT_ITERATORS_OVERFLOW(iter->ht))) {
          HT_DEC_ITERATORS_COUNT(iter->ht);
        }
        if (EXPECTED(!HT_ITERATORS_OVERFLOW(ht))) {
          HT_INC_ITERATORS_COUNT(ht);
        }
        iter->ht = copy_iter->ht;
        iter->pos = copy_iter->pos;
        zend_hash_remove_iterator_copies(idx);
        return true;
      }
      next_idx = copy_iter->next_copy;
    }
    zend_hash_remove_iterator_copies(idx);
  }

  return false;
}

ZEND_API HashPosition ZEND_FASTCALL zend_hash_iterator_pos(uint32_t idx, HashTable *ht)
{
  HashTableIterator *iter = EG(ht_iterators) + idx;

  ZEND_ASSERT(idx != (uint32_t)-1);
  if (UNEXPECTED(iter->ht != ht) && !zend_hash_iterator_find_copy_pos(idx, ht)) {
    if (EXPECTED(iter->ht) && EXPECTED(iter->ht != HT_POISONED_PTR)
        && EXPECTED(!HT_ITERATORS_OVERFLOW(iter->ht))) {
      HT_DEC_ITERATORS_COUNT(iter->ht);
    }
    if (EXPECTED(!HT_ITERATORS_OVERFLOW(ht))) {
      HT_INC_ITERATORS_COUNT(ht);
    }
    iter->ht = ht;
    iter->pos = _zend_hash_get_current_pos(ht);
  }
  return iter->pos;
}

ZEND_API HashPosition ZEND_FASTCALL zend_hash_iterator_pos_ex(uint32_t idx, zval *array)
{
  HashTable *ht = Z_ARRVAL_P(array);
  HashTableIterator *iter = EG(ht_iterators) + idx;

  ZEND_ASSERT(idx != (uint32_t)-1);
  if (UNEXPECTED(iter->ht != ht) && !zend_hash_iterator_find_copy_pos(idx, ht)) {
    if (EXPECTED(iter->ht) && EXPECTED(iter->ht != HT_POISONED_PTR)
        && EXPECTED(!HT_ITERATORS_OVERFLOW(ht))) {
      HT_DEC_ITERATORS_COUNT(iter->ht);
    }
    SEPARATE_ARRAY(array);
    ht = Z_ARRVAL_P(array);
    if (EXPECTED(!HT_ITERATORS_OVERFLOW(ht))) {
      HT_INC_ITERATORS_COUNT(ht);
    }
    iter->ht = ht;
    iter->pos = _zend_hash_get_current_pos(ht);
  }
  return iter->pos;
}

ZEND_API void ZEND_FASTCALL zend_hash_iterator_del(uint32_t idx)
{
  HashTableIterator *iter = EG(ht_iterators) + idx;

  ZEND_ASSERT(idx != (uint32_t)-1);

  if (EXPECTED(iter->ht) && EXPECTED(iter->ht != HT_POISONED_PTR)
      && EXPECTED(!HT_ITERATORS_OVERFLOW(iter->ht))) {
    ZEND_ASSERT(HT_ITERATORS_COUNT(iter->ht) != 0);
    HT_DEC_ITERATORS_COUNT(iter->ht);
  }
  iter->ht = NULL;

  if (UNEXPECTED(iter->next_copy != idx)) {
    zend_hash_remove_iterator_copies(idx);
  }

  if (idx == EG(ht_iterators_used) - 1) {
    while (idx > 0 && EG(ht_iterators)[idx - 1].ht == NULL) {
      idx--;
    }
    EG(ht_iterators_used) = idx;
  }
}

static zend_never_inline void ZEND_FASTCALL _zend_hash_iterators_remove(const HashTable *ht)
{
  HashTableIterator *iter = EG(ht_iterators);
  const HashTableIterator *end = iter + EG(ht_iterators_used);

  while (iter != end) {
    if (iter->ht == ht) {
      iter->ht = HT_POISONED_PTR;
    }
    iter++;
  }
}

static zend_always_inline void zend_hash_iterators_remove(const HashTable *ht)
{
  if (UNEXPECTED(HT_HAS_ITERATORS(ht))) {
    _zend_hash_iterators_remove(ht);
  }
}

ZEND_API HashPosition ZEND_FASTCALL zend_hash_iterators_lower_pos(const HashTable *ht, HashPosition start)
{
  const HashTableIterator *iter = EG(ht_iterators);
  const HashTableIterator *end = iter + EG(ht_iterators_used);
  HashPosition res = ht->nNumUsed;

  while (iter != end) {
    if (iter->ht == ht) {
      if (iter->pos >= start && iter->pos < res) {
        res = iter->pos;
      }
    }
    iter++;
  }
  return res;
}

ZEND_API void ZEND_FASTCALL _zend_hash_iterators_update(const HashTable *ht, HashPosition from, HashPosition to)
{
  HashTableIterator *iter = EG(ht_iterators);
  const HashTableIterator *end = iter + EG(ht_iterators_used);

  while (iter != end) {
    if (iter->ht == ht && iter->pos == from) {
      iter->pos = to;
    }
    iter++;
  }
}

ZEND_API void ZEND_FASTCALL zend_hash_iterators_advance(const HashTable *ht, HashPosition step)
{
  HashTableIterator *iter = EG(ht_iterators);
  const HashTableIterator *end = iter + EG(ht_iterators_used);

  while (iter != end) {
    if (iter->ht == ht) {
      iter->pos += step;
    }
    iter++;
  }
}

/* Hash must be known and precomputed before */
static zend_always_inline Bucket *zend_hash_find_bucket(const HashTable *ht, const zend_string *key)
{
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p, *arData;

  ZEND_ASSERT(ZSTR_H(key) != 0 && "Hash must be known");

  arData = ht->arData;
  nIndex = ZSTR_H(key) | ht->nTableMask;
  idx = HT_HASH_EX(arData, nIndex);

  if (UNEXPECTED(idx == HT_INVALID_IDX)) {
    return NULL;
  }
  p = HT_HASH_TO_BUCKET_EX(arData, idx);
  if (EXPECTED(p->key == key)) { /* check for the same interned string */
    return p;
  }

  while (1) {
    if (p->h == ZSTR_H(key) &&
        EXPECTED(p->key) &&
        zend_string_equal_content(p->key, key)) {
      return p;
    }
    idx = Z_NEXT(p->val);
    if (idx == HT_INVALID_IDX) {
      return NULL;
    }
    p = HT_HASH_TO_BUCKET_EX(arData, idx);
    if (p->key == key) { /* check for the same interned string */
      return p;
    }
  }
}

static zend_always_inline Bucket *zend_hash_str_find_bucket(const HashTable *ht, const char *str, size_t len, zend_ulong h)
{
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p, *arData;

  arData = ht->arData;
  nIndex = h | ht->nTableMask;
  idx = HT_HASH_EX(arData, nIndex);
  while (idx != HT_INVALID_IDX) {
    ZEND_ASSERT(idx < HT_IDX_TO_HASH(ht->nTableSize));
    p = HT_HASH_TO_BUCKET_EX(arData, idx);
    if ((p->h == h)
       && p->key
       && zend_string_equals_cstr(p->key, str, len)) {
      return p;
    }
    idx = Z_NEXT(p->val);
  }
  return NULL;
}

static zend_always_inline Bucket *zend_hash_index_find_bucket(const HashTable *ht, zend_ulong h)
{
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p, *arData;

  arData = ht->arData;
  nIndex = h | ht->nTableMask;
  idx = HT_HASH_EX(arData, nIndex);
  while (idx != HT_INVALID_IDX) {
    ZEND_ASSERT(idx < HT_IDX_TO_HASH(ht->nTableSize));
    p = HT_HASH_TO_BUCKET_EX(arData, idx);
    if (p->h == h && !p->key) {
      return p;
    }
    idx = Z_NEXT(p->val);
  }
  return NULL;
}

static zend_always_inline zval *_zend_hash_add_or_update_i(HashTable *ht, zend_string *key, zval *pData, uint32_t flag)
{
  zend_ulong h;
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p, *arData;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);
  zend_string_hash_val(key);

  if (UNEXPECTED(HT_FLAGS(ht) & (HASH_FLAG_UNINITIALIZED|HASH_FLAG_PACKED))) {
    if (EXPECTED(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
      zend_hash_real_init_mixed(ht);
      goto add_to_hash;
    } else {
      zend_hash_packed_to_hash(ht);
    }
  } else if ((flag & HASH_ADD_NEW) == 0 || ZEND_DEBUG) {
    p = zend_hash_find_bucket(ht, key);

    if (p) {
      zval *data;

      ZEND_ASSERT((flag & HASH_ADD_NEW) == 0);
      if (flag & HASH_LOOKUP) {
        return &p->val;
      } else if (flag & HASH_ADD) {
        if (!(flag & HASH_UPDATE_INDIRECT)) {
          return NULL;
        }
        ZEND_ASSERT(&p->val != pData);
        data = &p->val;
        if (Z_TYPE_P(data) == IS_INDIRECT) {
          data = Z_INDIRECT_P(data);
          if (Z_TYPE_P(data) != IS_UNDEF) {
            return NULL;
          }
        } else {
          return NULL;
        }
      } else {
        ZEND_ASSERT(&p->val != pData);
        data = &p->val;
        if ((flag & HASH_UPDATE_INDIRECT) && Z_TYPE_P(data) == IS_INDIRECT) {
          data = Z_INDIRECT_P(data);
        }
      }
      if (ht->pDestructor) {
        ht->pDestructor(data);
      }
      ZVAL_COPY_VALUE(data, pData);
      return data;
    }
  }

  ZEND_HASH_IF_FULL_DO_RESIZE(ht);   /* If the Hash table is full, resize it */

add_to_hash:
  if (!ZSTR_IS_INTERNED(key)) {
    zend_string_addref(key);
    HT_FLAGS(ht) &= ~HASH_FLAG_STATIC_KEYS;
  }
  idx = ht->nNumUsed++;
  ht->nNumOfElements++;
  arData = ht->arData;
  p = arData + idx;
  p->key = key;
  p->h = h = ZSTR_H(key);
  nIndex = h | ht->nTableMask;
  Z_NEXT(p->val) = HT_HASH_EX(arData, nIndex);
  HT_HASH_EX(arData, nIndex) = HT_IDX_TO_HASH(idx);
  if (flag & HASH_LOOKUP) {
    ZVAL_NULL(&p->val);
  } else {
    ZVAL_COPY_VALUE(&p->val, pData);
  }

  return &p->val;
}

static zend_always_inline zval *_zend_hash_str_add_or_update_i(HashTable *ht, const char *str, size_t len, zend_ulong h, zval *pData, uint32_t flag)
{
  zend_string *key;
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  if (UNEXPECTED(HT_FLAGS(ht) & (HASH_FLAG_UNINITIALIZED|HASH_FLAG_PACKED))) {
    if (EXPECTED(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
      zend_hash_real_init_mixed(ht);
      goto add_to_hash;
    } else {
      zend_hash_packed_to_hash(ht);
    }
  } else if ((flag & HASH_ADD_NEW) == 0) {
    p = zend_hash_str_find_bucket(ht, str, len, h);

    if (p) {
      zval *data;

      if (flag & HASH_LOOKUP) {
        return &p->val;
      } else if (flag & HASH_ADD) {
        if (!(flag & HASH_UPDATE_INDIRECT)) {
          return NULL;
        }
        ZEND_ASSERT(&p->val != pData);
        data = &p->val;
        if (Z_TYPE_P(data) == IS_INDIRECT) {
          data = Z_INDIRECT_P(data);
          if (Z_TYPE_P(data) != IS_UNDEF) {
            return NULL;
          }
        } else {
          return NULL;
        }
      } else {
        ZEND_ASSERT(&p->val != pData);
        data = &p->val;
        if ((flag & HASH_UPDATE_INDIRECT) && Z_TYPE_P(data) == IS_INDIRECT) {
          data = Z_INDIRECT_P(data);
        }
      }
      if (ht->pDestructor) {
        ht->pDestructor(data);
      }
      ZVAL_COPY_VALUE(data, pData);
      return data;
    }
  }

  ZEND_HASH_IF_FULL_DO_RESIZE(ht);   /* If the Hash table is full, resize it */

add_to_hash:
  idx = ht->nNumUsed++;
  ht->nNumOfElements++;
  p = ht->arData + idx;
  p->key = key = zend_string_init(str, len, GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
#if ZEND_RC_DEBUG
  if (GC_FLAGS(ht) & GC_PERSISTENT_LOCAL) {
    GC_MAKE_PERSISTENT_LOCAL(key);
  }
#endif
  p->h = ZSTR_H(key) = h;
  HT_FLAGS(ht) &= ~HASH_FLAG_STATIC_KEYS;
  if (flag & HASH_LOOKUP) {
    ZVAL_NULL(&p->val);
  } else {
    ZVAL_COPY_VALUE(&p->val, pData);
  }
  nIndex = h | ht->nTableMask;
  Z_NEXT(p->val) = HT_HASH(ht, nIndex);
  HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(idx);

  return &p->val;
}

ZEND_API zval* ZEND_FASTCALL zend_hash_add_or_update(HashTable *ht, zend_string *key, zval *pData, uint32_t flag)
{
  if (flag == HASH_ADD) {
    return zend_hash_add(ht, key, pData);
  } else if (flag == HASH_ADD_NEW) {
    return zend_hash_add_new(ht, key, pData);
  } else if (flag == HASH_UPDATE) {
    return zend_hash_update(ht, key, pData);
  } else {
    ZEND_ASSERT(flag == (HASH_UPDATE|HASH_UPDATE_INDIRECT));
    return zend_hash_update_ind(ht, key, pData);
  }
}

ZEND_API zval* ZEND_FASTCALL zend_hash_add(HashTable *ht, zend_string *key, zval *pData)
{
  return _zend_hash_add_or_update_i(ht, key, pData, HASH_ADD);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_update(HashTable *ht, zend_string *key, zval *pData)
{
  return _zend_hash_add_or_update_i(ht, key, pData, HASH_UPDATE);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_update_ind(HashTable *ht, zend_string *key, zval *pData)
{
  return _zend_hash_add_or_update_i(ht, key, pData, HASH_UPDATE | HASH_UPDATE_INDIRECT);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_add_new(HashTable *ht, zend_string *key, zval *pData)
{
  return _zend_hash_add_or_update_i(ht, key, pData, HASH_ADD_NEW);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_lookup(HashTable *ht, zend_string *key)
{
  return _zend_hash_add_or_update_i(ht, key, NULL, HASH_LOOKUP);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_str_add_or_update(HashTable *ht, const char *str, size_t len, zval *pData, uint32_t flag)
{
  if (flag == HASH_ADD) {
    return zend_hash_str_add(ht, str, len, pData);
  } else if (flag == HASH_ADD_NEW) {
    return zend_hash_str_add_new(ht, str, len, pData);
  } else if (flag == HASH_UPDATE) {
    return zend_hash_str_update(ht, str, len, pData);
  } else {
    ZEND_ASSERT(flag == (HASH_UPDATE|HASH_UPDATE_INDIRECT));
    return zend_hash_str_update_ind(ht, str, len, pData);
  }
}

ZEND_API zval* ZEND_FASTCALL zend_hash_str_update(HashTable *ht, const char *str, size_t len, zval *pData)
{
  zend_ulong h = zend_hash_func(str, len);

  return _zend_hash_str_add_or_update_i(ht, str, len, h, pData, HASH_UPDATE);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_str_update_ind(HashTable *ht, const char *str, size_t len, zval *pData)
{
  zend_ulong h = zend_hash_func(str, len);

  return _zend_hash_str_add_or_update_i(ht, str, len, h, pData, HASH_UPDATE | HASH_UPDATE_INDIRECT);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_str_add(HashTable *ht, const char *str, size_t len, zval *pData)
{
  zend_ulong h = zend_hash_func(str, len);

  return _zend_hash_str_add_or_update_i(ht, str, len, h, pData, HASH_ADD);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_str_add_new(HashTable *ht, const char *str, size_t len, zval *pData)
{
  zend_ulong h = zend_hash_func(str, len);

  return _zend_hash_str_add_or_update_i(ht, str, len, h, pData, HASH_ADD_NEW);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_index_add_empty_element(HashTable *ht, zend_ulong h)
{
  zval dummy;

  ZVAL_NULL(&dummy);
  return zend_hash_index_add(ht, h, &dummy);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_add_empty_element(HashTable *ht, zend_string *key)
{
  zval dummy;

  ZVAL_NULL(&dummy);
  return zend_hash_add(ht, key, &dummy);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_str_add_empty_element(HashTable *ht, const char *str, size_t len)
{
  zval dummy;

  ZVAL_NULL(&dummy);
  return zend_hash_str_add(ht, str, len, &dummy);
}

static zend_always_inline zval *_zend_hash_index_add_or_update_i(HashTable *ht, zend_ulong h, zval *pData, uint32_t flag)
{
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p;
  zval *zv;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  if ((flag & HASH_ADD_NEXT) && h == ZEND_LONG_MIN) {
    h = 0;
  }

  if (HT_IS_PACKED(ht)) {
    if ((flag & (HASH_ADD_NEW|HASH_ADD_NEXT)) != (HASH_ADD_NEW|HASH_ADD_NEXT)
     && h < ht->nNumUsed) {
      zv = ht->arPacked + h;
      if (Z_TYPE_P(zv) != IS_UNDEF) {
        if (flag & HASH_LOOKUP) {
          return zv;
        }
replace:
        if (flag & HASH_ADD) {
          return NULL;
        }
        if (ht->pDestructor) {
          ht->pDestructor(zv);
        }
        ZVAL_COPY_VALUE(zv, pData);
        return zv;
      } else { /* we have to keep the order :( */
        goto convert_to_hash;
      }
    } else if (EXPECTED(h < ht->nTableSize)) {
add_to_packed:
      zv = ht->arPacked + h;
      /* incremental initialization of empty Buckets */
      if ((flag & (HASH_ADD_NEW|HASH_ADD_NEXT)) != (HASH_ADD_NEW|HASH_ADD_NEXT)) {
        if (h > ht->nNumUsed) {
          zval *q = ht->arPacked + ht->nNumUsed;
          while (q != zv) {
            ZVAL_UNDEF(q);
            q++;
          }
        }
      }
      ht->nNextFreeElement = ht->nNumUsed = h + 1;
      ht->nNumOfElements++;
      if (flag & HASH_LOOKUP) {
        ZVAL_NULL(zv);
      } else {
        ZVAL_COPY_VALUE(zv, pData);
      }

      return zv;
    } else if ((h >> 1) < ht->nTableSize &&
               (ht->nTableSize >> 1) < ht->nNumOfElements) {
      zend_hash_packed_grow(ht);
      goto add_to_packed;
    } else {
      if (ht->nNumUsed >= ht->nTableSize) {
        ht->nTableSize += ht->nTableSize;
      }
convert_to_hash:
      zend_hash_packed_to_hash(ht);
    }
  } else if (HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED) {
    if (h < ht->nTableSize) {
      zend_hash_real_init_packed_ex(ht);
      goto add_to_packed;
    }
    zend_hash_real_init_mixed(ht);
  } else {
    if ((flag & HASH_ADD_NEW) == 0 || ZEND_DEBUG) {
      p = zend_hash_index_find_bucket(ht, h);
      if (p) {
        if (flag & HASH_LOOKUP) {
          return &p->val;
        }
        ZEND_ASSERT((flag & HASH_ADD_NEW) == 0);
        zv = &p->val;
        goto replace;
      }
    }
    ZEND_HASH_IF_FULL_DO_RESIZE(ht);   /* If the Hash table is full, resize it */
  }

  idx = ht->nNumUsed++;
  nIndex = h | ht->nTableMask;
  p = ht->arData + idx;
  Z_NEXT(p->val) = HT_HASH(ht, nIndex);
  HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(idx);
  if ((zend_long)h >= ht->nNextFreeElement) {
    ht->nNextFreeElement = (zend_long)h < ZEND_LONG_MAX ? h + 1 : ZEND_LONG_MAX;
  }
  ht->nNumOfElements++;
  p->h = h;
  p->key = NULL;
  if (flag & HASH_LOOKUP) {
    ZVAL_NULL(&p->val);
  } else {
    ZVAL_COPY_VALUE(&p->val, pData);
  }

  return &p->val;
}

ZEND_API zval* ZEND_FASTCALL zend_hash_index_add_or_update(HashTable *ht, zend_ulong h, zval *pData, uint32_t flag)
{
  if (flag == HASH_ADD) {
    return zend_hash_index_add(ht, h, pData);
  } else if (flag == (HASH_ADD|HASH_ADD_NEW)) {
    return zend_hash_index_add_new(ht, h, pData);
  } else if (flag == (HASH_ADD|HASH_ADD_NEXT)) {
    ZEND_ASSERT(h == ht->nNextFreeElement);
    return zend_hash_next_index_insert(ht, pData);
  } else if (flag == (HASH_ADD|HASH_ADD_NEW|HASH_ADD_NEXT)) {
    ZEND_ASSERT(h == ht->nNextFreeElement);
    return zend_hash_next_index_insert_new(ht, pData);
  } else {
    ZEND_ASSERT(flag == HASH_UPDATE);
    return zend_hash_index_update(ht, h, pData);
  }
}

ZEND_API zval* ZEND_FASTCALL zend_hash_index_add(HashTable *ht, zend_ulong h, zval *pData)
{
  return _zend_hash_index_add_or_update_i(ht, h, pData, HASH_ADD);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_index_add_new(HashTable *ht, zend_ulong h, zval *pData)
{
  return _zend_hash_index_add_or_update_i(ht, h, pData, HASH_ADD | HASH_ADD_NEW);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_index_update(HashTable *ht, zend_ulong h, zval *pData)
{
  return _zend_hash_index_add_or_update_i(ht, h, pData, HASH_UPDATE);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_next_index_insert(HashTable *ht, zval *pData)
{
  return _zend_hash_index_add_or_update_i(ht, ht->nNextFreeElement, pData, HASH_ADD | HASH_ADD_NEXT);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_next_index_insert_new(HashTable *ht, zval *pData)
{
  return _zend_hash_index_add_or_update_i(ht, ht->nNextFreeElement, pData, HASH_ADD | HASH_ADD_NEW | HASH_ADD_NEXT);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_index_lookup(HashTable *ht, zend_ulong h)
{
  return _zend_hash_index_add_or_update_i(ht, h, NULL, HASH_LOOKUP);
}

ZEND_API zval* ZEND_FASTCALL zend_hash_set_bucket_key(HashTable *ht, Bucket *b, zend_string *key)
{
  uint32_t nIndex;
  uint32_t idx, i;
  Bucket *p, *arData;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);
  ZEND_ASSERT(!HT_IS_PACKED(ht));

  (void)zend_string_hash_val(key);
  p = zend_hash_find_bucket(ht, key);
  if (UNEXPECTED(p)) {
    return (p == b) ? &p->val : NULL;
  }

  if (!ZSTR_IS_INTERNED(key)) {
    zend_string_addref(key);
    HT_FLAGS(ht) &= ~HASH_FLAG_STATIC_KEYS;
  }

  arData = ht->arData;

  /* del from hash */
  idx = HT_IDX_TO_HASH(b - arData);
  nIndex = b->h | ht->nTableMask;
  i = HT_HASH_EX(arData, nIndex);
  if (i == idx) {
    HT_HASH_EX(arData, nIndex) = Z_NEXT(b->val);
  } else {
    p = HT_HASH_TO_BUCKET_EX(arData, i);
    while (Z_NEXT(p->val) != idx) {
      i = Z_NEXT(p->val);
      p = HT_HASH_TO_BUCKET_EX(arData, i);
    }
    Z_NEXT(p->val) = Z_NEXT(b->val);
  }
  zend_string_release(b->key);

  /* add to hash */
  idx = b - arData;
  b->key = key;
  b->h = ZSTR_H(key);
  nIndex = b->h | ht->nTableMask;
  idx = HT_IDX_TO_HASH(idx);
  i = HT_HASH_EX(arData, nIndex);
  if (i == HT_INVALID_IDX || i < idx) {
    Z_NEXT(b->val) = i;
    HT_HASH_EX(arData, nIndex) = idx;
  } else {
    p = HT_HASH_TO_BUCKET_EX(arData, i);
    while (Z_NEXT(p->val) != HT_INVALID_IDX && Z_NEXT(p->val) > idx) {
      i = Z_NEXT(p->val);
      p = HT_HASH_TO_BUCKET_EX(arData, i);
    }
    Z_NEXT(b->val) = Z_NEXT(p->val);
    Z_NEXT(p->val) = idx;
  }
  return &b->val;
}

static void ZEND_FASTCALL zend_hash_do_resize(HashTable *ht)
{

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  ZEND_ASSERT(!HT_IS_PACKED(ht));
  if (ht->nNumUsed > ht->nNumOfElements + (ht->nNumOfElements >> 5)) { /* additional term is there to amortize the cost of compaction */
    zend_hash_rehash(ht);
  } else if (ht->nTableSize < HT_MAX_SIZE) { /* Let's double the table size */
    void *new_data, *old_data = HT_GET_DATA_ADDR(ht);
    uint32_t nSize = ht->nTableSize + ht->nTableSize;
    Bucket *old_buckets = ht->arData;

    ZEND_ASSERT(HT_SIZE_TO_MASK(nSize));

    new_data = pemalloc(HT_SIZE_EX(nSize, HT_SIZE_TO_MASK(nSize)), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
    ht->nTableSize = nSize;
    ht->nTableMask = HT_SIZE_TO_MASK(ht->nTableSize);
    HT_SET_DATA_ADDR(ht, new_data);
    memcpy(ht->arData, old_buckets, sizeof(Bucket) * ht->nNumUsed);
    pefree(old_data, GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
    zend_hash_rehash(ht);
  } else {
    zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%u * %zu + %zu)", ht->nTableSize * 2, sizeof(Bucket) + sizeof(uint32_t), sizeof(Bucket));
  }
}

ZEND_API void ZEND_FASTCALL zend_hash_rehash(HashTable *ht)
{
  Bucket *p;
  uint32_t nIndex, i;

  IS_CONSISTENT(ht);

  if (UNEXPECTED(ht->nNumOfElements == 0)) {
    if (!(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
      ht->nNumUsed = 0;
      HT_HASH_RESET(ht);
      /* Even if the array is empty, we still need to reset the iterator positions. */
      ht->nInternalPointer = 0;
      if (UNEXPECTED(HT_HAS_ITERATORS(ht))) {
        HashTableIterator *iter = EG(ht_iterators);
        HashTableIterator *end  = iter + EG(ht_iterators_used);
        while (iter != end) {
          if (iter->ht == ht) {
            iter->pos = 0;
          }
          iter++;
        }
      }
    }
    return;
  }

  HT_HASH_RESET(ht);
  i = 0;
  p = ht->arData;
  if (HT_IS_WITHOUT_HOLES(ht)) {
    do {
      nIndex = p->h | ht->nTableMask;
      Z_NEXT(p->val) = HT_HASH(ht, nIndex);
      HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(i);
      p++;
    } while (++i < ht->nNumUsed);
  } else {
    uint32_t old_num_used = ht->nNumUsed;
    do {
      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) {
        uint32_t j = i;
        Bucket *q = p;

        if (EXPECTED(!HT_HAS_ITERATORS(ht))) {
          while (++i < ht->nNumUsed) {
            p++;
            if (EXPECTED(Z_TYPE_INFO(p->val) != IS_UNDEF)) {
              ZVAL_COPY_VALUE(&q->val, &p->val);
              q->h = p->h;
              nIndex = q->h | ht->nTableMask;
              q->key = p->key;
              Z_NEXT(q->val) = HT_HASH(ht, nIndex);
              HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(j);
              if (UNEXPECTED(ht->nInternalPointer == i)) {
                ht->nInternalPointer = j;
              }
              q++;
              j++;
            }
          }
        } else {
          uint32_t iter_pos = zend_hash_iterators_lower_pos(ht, i + 1);

          while (++i < ht->nNumUsed) {
            p++;
            if (EXPECTED(Z_TYPE_INFO(p->val) != IS_UNDEF)) {
              ZVAL_COPY_VALUE(&q->val, &p->val);
              q->h = p->h;
              nIndex = q->h | ht->nTableMask;
              q->key = p->key;
              Z_NEXT(q->val) = HT_HASH(ht, nIndex);
              HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(j);
              if (UNEXPECTED(ht->nInternalPointer == i)) {
                ht->nInternalPointer = j;
              }
              if (UNEXPECTED(i >= iter_pos)) {
                do {
                  zend_hash_iterators_update(ht, iter_pos, j);
                  iter_pos = zend_hash_iterators_lower_pos(ht, iter_pos + 1);
                } while (iter_pos < i);
              }
              q++;
              j++;
            }
          }
        }
        ht->nNumUsed = j;
        break;
      }
      nIndex = p->h | ht->nTableMask;
      Z_NEXT(p->val) = HT_HASH(ht, nIndex);
      HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(i);
      p++;
    } while (++i < ht->nNumUsed);

    /* Migrate pointer to one past the end of the array to the new one past the end, so that
     * newly inserted elements are picked up correctly. */
    if (UNEXPECTED(HT_HAS_ITERATORS(ht))) {
      _zend_hash_iterators_update(ht, old_num_used, ht->nNumUsed);
    }
  }
}

static zend_always_inline void zend_hash_iterators_clamp_max(const HashTable *ht, uint32_t max)
{
  if (UNEXPECTED(HT_HAS_ITERATORS(ht))) {
    HashTableIterator *iter = EG(ht_iterators);
    const HashTableIterator *end = iter + EG(ht_iterators_used);
    while (iter != end) {
      if (iter->ht == ht) {
        iter->pos = MIN(iter->pos, max);
      }
      iter++;
    }
  }
}

static zend_always_inline void _zend_hash_packed_del_val(HashTable *ht, uint32_t idx, zval *zv)
{
  idx = HT_HASH_TO_IDX(idx);
  ht->nNumOfElements--;
  if (ht->nNumUsed - 1 == idx) {
    do {
      ht->nNumUsed--;
    } while (ht->nNumUsed > 0 && (UNEXPECTED(Z_TYPE(ht->arPacked[ht->nNumUsed-1]) == IS_UNDEF)));
    ht->nInternalPointer = MIN(ht->nInternalPointer, ht->nNumUsed);
    zend_hash_iterators_clamp_max(ht, ht->nNumUsed);
  }
  if (ht->pDestructor) {
    zval tmp;
    ZVAL_COPY_VALUE(&tmp, zv);
    ZVAL_UNDEF(zv);
    ht->pDestructor(&tmp);
  } else {
    ZVAL_UNDEF(zv);
  }
}

static zend_always_inline void _zend_hash_del_el_ex(HashTable *ht, uint32_t idx, Bucket *p, Bucket *prev)
{
  if (prev) {
    Z_NEXT(prev->val) = Z_NEXT(p->val);
  } else {
    HT_HASH(ht, p->h | ht->nTableMask) = Z_NEXT(p->val);
  }
  idx = HT_HASH_TO_IDX(idx);
  ht->nNumOfElements--;
  if (ht->nNumUsed - 1 == idx) {
    do {
      ht->nNumUsed--;
    } while (ht->nNumUsed > 0 && (UNEXPECTED(Z_TYPE(ht->arData[ht->nNumUsed-1].val) == IS_UNDEF)));
    ht->nInternalPointer = MIN(ht->nInternalPointer, ht->nNumUsed);
    zend_hash_iterators_clamp_max(ht, ht->nNumUsed);
  }
  if (ht->pDestructor) {
    zval tmp;
    ZVAL_COPY_VALUE(&tmp, &p->val);
    ZVAL_UNDEF(&p->val);
    ht->pDestructor(&tmp);
  } else {
    ZVAL_UNDEF(&p->val);
  }
}

static zend_always_inline void _zend_hash_del_el(HashTable *ht, uint32_t idx, Bucket *p)
{
  Bucket *prev = NULL;
  uint32_t nIndex;
  uint32_t i;

  nIndex = p->h | ht->nTableMask;
  i = HT_HASH(ht, nIndex);

  if (i != idx) {
    prev = HT_HASH_TO_BUCKET(ht, i);
    while (Z_NEXT(prev->val) != idx) {
      i = Z_NEXT(prev->val);
      prev = HT_HASH_TO_BUCKET(ht, i);
    }
  }

  if (p->key) {
    zend_string_release(p->key);
    p->key = NULL;
  }
  _zend_hash_del_el_ex(ht, idx, p, prev);
}

ZEND_API void ZEND_FASTCALL zend_hash_packed_del_val(HashTable *ht, zval *zv)
{
  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);
  ZEND_ASSERT(HT_IS_PACKED(ht));
  _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(zv - ht->arPacked), zv);
}


ZEND_API void ZEND_FASTCALL zend_hash_del_bucket(HashTable *ht, Bucket *p)
{
  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);
  ZEND_ASSERT(!HT_IS_PACKED(ht));
  _zend_hash_del_el(ht, HT_IDX_TO_HASH(p - ht->arData), p);
}

ZEND_API zend_result ZEND_FASTCALL zend_hash_del(HashTable *ht, zend_string *key)
{
  zend_ulong h;
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p;
  Bucket *prev = NULL;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  h = zend_string_hash_val(key);
  nIndex = h | ht->nTableMask;

  idx = HT_HASH(ht, nIndex);
  while (idx != HT_INVALID_IDX) {
    p = HT_HASH_TO_BUCKET(ht, idx);
    if ((p->key == key) ||
      (p->h == h &&
         p->key &&
         zend_string_equal_content(p->key, key))) {
      zend_string_release(p->key);
      p->key = NULL;
      _zend_hash_del_el_ex(ht, idx, p, prev);
      return SUCCESS;
    }
    prev = p;
    idx = Z_NEXT(p->val);
  }
  return FAILURE;
}

ZEND_API zend_result ZEND_FASTCALL zend_hash_del_ind(HashTable *ht, zend_string *key)
{
  zend_ulong h;
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p;
  Bucket *prev = NULL;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  h = zend_string_hash_val(key);
  nIndex = h | ht->nTableMask;

  idx = HT_HASH(ht, nIndex);
  while (idx != HT_INVALID_IDX) {
    p = HT_HASH_TO_BUCKET(ht, idx);
    if ((p->key == key) ||
      (p->h == h &&
         p->key &&
         zend_string_equal_content(p->key, key))) {
      if (Z_TYPE(p->val) == IS_INDIRECT) {
        zval *data = Z_INDIRECT(p->val);

        if (UNEXPECTED(Z_TYPE_P(data) == IS_UNDEF)) {
          return FAILURE;
        } else {
          if (ht->pDestructor) {
            zval tmp;
            ZVAL_COPY_VALUE(&tmp, data);
            ZVAL_UNDEF(data);
            ht->pDestructor(&tmp);
          } else {
            ZVAL_UNDEF(data);
          }
          HT_FLAGS(ht) |= HASH_FLAG_HAS_EMPTY_IND;
        }
      } else {
        zend_string_release(p->key);
        p->key = NULL;
        _zend_hash_del_el_ex(ht, idx, p, prev);
      }
      return SUCCESS;
    }
    prev = p;
    idx = Z_NEXT(p->val);
  }
  return FAILURE;
}

ZEND_API zend_result ZEND_FASTCALL zend_hash_str_del_ind(HashTable *ht, const char *str, size_t len)
{
  zend_ulong h;
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p;
  Bucket *prev = NULL;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  h = zend_inline_hash_func(str, len);
  nIndex = h | ht->nTableMask;

  idx = HT_HASH(ht, nIndex);
  while (idx != HT_INVALID_IDX) {
    p = HT_HASH_TO_BUCKET(ht, idx);
    if ((p->h == h)
       && p->key
       && zend_string_equals_cstr(p->key, str, len)) {
      if (Z_TYPE(p->val) == IS_INDIRECT) {
        zval *data = Z_INDIRECT(p->val);

        if (UNEXPECTED(Z_TYPE_P(data) == IS_UNDEF)) {
          return FAILURE;
        } else {
          if (ht->pDestructor) {
            ht->pDestructor(data);
          }
          ZVAL_UNDEF(data);
          HT_FLAGS(ht) |= HASH_FLAG_HAS_EMPTY_IND;
        }
      } else {
        zend_string_release(p->key);
        p->key = NULL;
        _zend_hash_del_el_ex(ht, idx, p, prev);
      }
      return SUCCESS;
    }
    prev = p;
    idx = Z_NEXT(p->val);
  }
  return FAILURE;
}

ZEND_API zend_result ZEND_FASTCALL zend_hash_str_del(HashTable *ht, const char *str, size_t len)
{
  zend_ulong h;
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p;
  Bucket *prev = NULL;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  h = zend_inline_hash_func(str, len);
  nIndex = h | ht->nTableMask;

  idx = HT_HASH(ht, nIndex);
  while (idx != HT_INVALID_IDX) {
    p = HT_HASH_TO_BUCKET(ht, idx);
    if ((p->h == h)
       && p->key
       && zend_string_equals_cstr(p->key, str, len)) {
      zend_string_release(p->key);
      p->key = NULL;
      _zend_hash_del_el_ex(ht, idx, p, prev);
      return SUCCESS;
    }
    prev = p;
    idx = Z_NEXT(p->val);
  }
  return FAILURE;
}

ZEND_API zend_result ZEND_FASTCALL zend_hash_index_del(HashTable *ht, zend_ulong h)
{
  uint32_t nIndex;
  uint32_t idx;
  Bucket *p;
  Bucket *prev = NULL;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  if (HT_IS_PACKED(ht)) {
    if (h < ht->nNumUsed) {
      zval *zv = ht->arPacked + h;
      if (Z_TYPE_P(zv) != IS_UNDEF) {
        _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(h), zv);
        return SUCCESS;
      }
    }
    return FAILURE;
  }
  nIndex = h | ht->nTableMask;

  idx = HT_HASH(ht, nIndex);
  while (idx != HT_INVALID_IDX) {
    p = HT_HASH_TO_BUCKET(ht, idx);
    if ((p->h == h) && (p->key == NULL)) {
      _zend_hash_del_el_ex(ht, idx, p, prev);
      return SUCCESS;
    }
    prev = p;
    idx = Z_NEXT(p->val);
  }
  return FAILURE;
}

ZEND_API void ZEND_FASTCALL zend_hash_destroy(HashTable *ht)
{
  IS_CONSISTENT(ht);
  HT_ASSERT(ht, GC_REFCOUNT(ht) <= 1);

  if (ht->nNumUsed) {
    if (HT_IS_PACKED(ht)) {
      if (ht->pDestructor) {
        zval *zv = ht->arPacked;
        zval *end = zv + ht->nNumUsed;

        SET_INCONSISTENT(HT_IS_DESTROYING);
        if (HT_IS_WITHOUT_HOLES(ht)) {
          do {
            ht->pDestructor(zv);
          } while (++zv != end);
        } else {
          do {
            if (EXPECTED(Z_TYPE_P(zv) != IS_UNDEF)) {
              ht->pDestructor(zv);
            }
          } while (++zv != end);
        }
        SET_INCONSISTENT(HT_DESTROYED);
      }
      zend_hash_iterators_remove(ht);
    } else {
      Bucket *p = ht->arData;
      Bucket *end = p + ht->nNumUsed;

      if (ht->pDestructor) {
        SET_INCONSISTENT(HT_IS_DESTROYING);

        if (HT_HAS_STATIC_KEYS_ONLY(ht)) {
          if (HT_IS_WITHOUT_HOLES(ht)) {
            do {
              ht->pDestructor(&p->val);
            } while (++p != end);
          } else {
            do {
              if (EXPECTED(Z_TYPE(p->val) != IS_UNDEF)) {
                ht->pDestructor(&p->val);
              }
            } while (++p != end);
          }
        } else if (HT_IS_WITHOUT_HOLES(ht)) {
          do {
            ht->pDestructor(&p->val);
            if (EXPECTED(p->key)) {
              zend_string_release(p->key);
            }
          } while (++p != end);
        } else {
          do {
            if (EXPECTED(Z_TYPE(p->val) != IS_UNDEF)) {
              ht->pDestructor(&p->val);
              if (EXPECTED(p->key)) {
                zend_string_release(p->key);
              }
            }
          } while (++p != end);
        }

        SET_INCONSISTENT(HT_DESTROYED);
      } else {
        if (!HT_HAS_STATIC_KEYS_ONLY(ht)) {
          do {
            if (EXPECTED(p->key)) {
              zend_string_release(p->key);
            }
          } while (++p != end);
        }
      }
      zend_hash_iterators_remove(ht);
    }
  } else if (EXPECTED(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
    return;
  }
  pefree(HT_GET_DATA_ADDR(ht), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
}

ZEND_API void ZEND_FASTCALL zend_array_destroy(HashTable *ht)
{
  IS_CONSISTENT(ht);
  HT_ASSERT(ht, GC_REFCOUNT(ht) <= 1);

  /* break possible cycles */
  GC_REMOVE_FROM_BUFFER(ht);
  GC_TYPE_INFO(ht) = GC_NULL /*???| (GC_WHITE << 16)*/;

  if (ht->nNumUsed) {
    /* In some rare cases destructors of regular arrays may be changed */
    if (UNEXPECTED(ht->pDestructor != ZVAL_PTR_DTOR)) {
      zend_hash_destroy(ht);
      goto free_ht;
    }

    SET_INCONSISTENT(HT_IS_DESTROYING);

    if (HT_IS_PACKED(ht)) {
      zval *zv = ht->arPacked;
      zval *end = zv + ht->nNumUsed;

      do {
        i_zval_ptr_dtor(zv);
      } while (++zv != end);
    } else {
      Bucket *p = ht->arData;
      Bucket *end = p + ht->nNumUsed;

      if (HT_HAS_STATIC_KEYS_ONLY(ht)) {
        do {
          i_zval_ptr_dtor(&p->val);
        } while (++p != end);
      } else if (HT_IS_WITHOUT_HOLES(ht)) {
        do {
          i_zval_ptr_dtor(&p->val);
          if (EXPECTED(p->key)) {
            zend_string_release_ex(p->key, 0);
          }
        } while (++p != end);
      } else {
        do {
          if (EXPECTED(Z_TYPE(p->val) != IS_UNDEF)) {
            i_zval_ptr_dtor(&p->val);
            if (EXPECTED(p->key)) {
              zend_string_release_ex(p->key, 0);
            }
          }
        } while (++p != end);
      }
    }
  } else if (EXPECTED(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
    goto free_ht;
  }
  SET_INCONSISTENT(HT_DESTROYED);
  efree(HT_GET_DATA_ADDR(ht));
free_ht:
  zend_hash_iterators_remove(ht);
  FREE_HASHTABLE(ht);
}

ZEND_API void ZEND_FASTCALL zend_hash_clean(HashTable *ht)
{
  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  if (ht->nNumUsed) {
    if (HT_IS_PACKED(ht)) {
      zval *zv = ht->arPacked;
      zval *end = zv + ht->nNumUsed;

      if (ht->pDestructor) {
        if (HT_HAS_STATIC_KEYS_ONLY(ht)) {
          if (HT_IS_WITHOUT_HOLES(ht)) {
            do {
              ht->pDestructor(zv);
            } while (++zv != end);
          } else {
            do {
              if (EXPECTED(Z_TYPE_P(zv) != IS_UNDEF)) {
                ht->pDestructor(zv);
              }
            } while (++zv != end);
          }
        }
      }
    } else {
      Bucket *p = ht->arData;
      Bucket *end = p + ht->nNumUsed;

      if (ht->pDestructor) {
        if (HT_HAS_STATIC_KEYS_ONLY(ht)) {
          if (HT_IS_WITHOUT_HOLES(ht)) {
            do {
              ht->pDestructor(&p->val);
            } while (++p != end);
          } else {
            do {
              if (EXPECTED(Z_TYPE(p->val) != IS_UNDEF)) {
                ht->pDestructor(&p->val);
              }
            } while (++p != end);
          }
        } else if (HT_IS_WITHOUT_HOLES(ht)) {
          do {
            ht->pDestructor(&p->val);
            if (EXPECTED(p->key)) {
              zend_string_release(p->key);
            }
          } while (++p != end);
        } else {
          do {
            if (EXPECTED(Z_TYPE(p->val) != IS_UNDEF)) {
              ht->pDestructor(&p->val);
              if (EXPECTED(p->key)) {
                zend_string_release(p->key);
              }
            }
          } while (++p != end);
        }
      } else {
        if (!HT_HAS_STATIC_KEYS_ONLY(ht)) {
          do {
            if (EXPECTED(p->key)) {
              zend_string_release(p->key);
            }
          } while (++p != end);
        }
      }
      HT_HASH_RESET(ht);
    }
  }
  ht->nNumUsed = 0;
  ht->nNumOfElements = 0;
  ht->nNextFreeElement = ZEND_LONG_MIN;
  ht->nInternalPointer = 0;
}

ZEND_API void ZEND_FASTCALL zend_symtable_clean(HashTable *ht)
{
  Bucket *p, *end;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  if (ht->nNumUsed) {
    ZEND_ASSERT(!HT_IS_PACKED(ht));
    p = ht->arData;
    end = p + ht->nNumUsed;
    if (HT_HAS_STATIC_KEYS_ONLY(ht)) {
      do {
        i_zval_ptr_dtor(&p->val);
      } while (++p != end);
    } else if (HT_IS_WITHOUT_HOLES(ht)) {
      do {
        i_zval_ptr_dtor(&p->val);
        if (EXPECTED(p->key)) {
          zend_string_release(p->key);
        }
      } while (++p != end);
    } else {
      do {
        if (EXPECTED(Z_TYPE(p->val) != IS_UNDEF)) {
          i_zval_ptr_dtor(&p->val);
          if (EXPECTED(p->key)) {
            zend_string_release(p->key);
          }
        }
      } while (++p != end);
    }
    HT_HASH_RESET(ht);
  }
  ht->nNumUsed = 0;
  ht->nNumOfElements = 0;
  ht->nNextFreeElement = ZEND_LONG_MIN;
  ht->nInternalPointer = 0;
}

ZEND_API void ZEND_FASTCALL zend_hash_graceful_destroy(HashTable *ht)
{
  uint32_t idx;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  if (HT_IS_PACKED(ht)) {
    zval *zv = ht->arPacked;

    for (idx = 0; idx < ht->nNumUsed; idx++, zv++) {
      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;
      _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(idx), zv);
    }
  } else {
    Bucket *p = ht->arData;

    for (idx = 0; idx < ht->nNumUsed; idx++, p++) {
      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
      _zend_hash_del_el(ht, HT_IDX_TO_HASH(idx), p);
    }
  }
  if (!(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
    pefree(HT_GET_DATA_ADDR(ht), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
  }

  SET_INCONSISTENT(HT_DESTROYED);
}

ZEND_API void ZEND_FASTCALL zend_hash_graceful_reverse_destroy(HashTable *ht)
{
  uint32_t idx;

  IS_CONSISTENT(ht);
  HT_ASSERT_RC1(ht);

  idx = ht->nNumUsed;
  if (HT_IS_PACKED(ht)) {
    zval *zv = ht->arPacked + ht->nNumUsed;

    while (idx > 0) {
      idx--;
      zv--;
      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;
      _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(idx), zv);
    }
  } else {
    Bucket *p = ht->arData + ht->nNumUsed;

    while (idx > 0) {
      idx--;
      p--;
      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
      _zend_hash_del_el(ht, HT_IDX_TO_HASH(idx), p);
    }
  }

  if (!(HT_FLAGS(ht) & HASH_FLAG_UNINITIALIZED)) {
    pefree(HT_GET_DATA_ADDR(ht), GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
  }

  SET_INCONSISTENT(HT_DESTROYED);
}

/* This is used to recurse elements and selectively delete certain entries
 * from a hashtable. apply_func() receives the data and decides if the entry
 * should be deleted or recursion should be stopped. The following three
 * return codes are possible:
 * ZEND_HASH_APPLY_KEEP   - continue
 * ZEND_HASH_APPLY_STOP   - stop iteration
 * ZEND_HASH_APPLY_REMOVE - delete the element, combinable with the former
 */

ZEND_API void ZEND_FASTCALL zend_hash_apply(HashTable *ht, apply_func_t apply_func)
{
  uint32_t idx;
  int result;

  IS_CONSISTENT(ht);
  if (HT_IS_PACKED(ht)) {
    for (idx = 0; idx < ht->nNumUsed; idx++) {
      zval *zv = ht->arPacked + idx;

      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;
      result = apply_func(zv);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(idx), zv);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        break;
      }
    }
  } else {
    for (idx = 0; idx < ht->nNumUsed; idx++) {
      Bucket *p = ht->arData + idx;

      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
      result = apply_func(&p->val);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_del_el(ht, HT_IDX_TO_HASH(idx), p);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        break;
      }
    }
  }
}


ZEND_API void ZEND_FASTCALL zend_hash_apply_with_argument(HashTable *ht, apply_func_arg_t apply_func, void *argument)
{
  uint32_t idx;
  int result;

  IS_CONSISTENT(ht);
  if (HT_IS_PACKED(ht)) {
    for (idx = 0; idx < ht->nNumUsed; idx++) {
      zval *zv = ht->arPacked + idx;
      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;
      result = apply_func(zv, argument);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(idx), zv);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        break;
      }
    }
  } else {
    for (idx = 0; idx < ht->nNumUsed; idx++) {
      Bucket *p = ht->arData + idx;
      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
      result = apply_func(&p->val, argument);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_del_el(ht, HT_IDX_TO_HASH(idx), p);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        break;
      }
    }
  }
}


ZEND_API void zend_hash_apply_with_arguments(HashTable *ht, apply_func_args_t apply_func, int num_args, ...)
{
  uint32_t idx;
  va_list args;
  zend_hash_key hash_key;
  int result;

  IS_CONSISTENT(ht);

  if (HT_IS_PACKED(ht)) {
    for (idx = 0; idx < ht->nNumUsed; idx++) {
      zval *zv = ht->arPacked + idx;

      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;
      va_start(args, num_args);
      hash_key.h = idx;
      hash_key.key = NULL;

      result = apply_func(zv, num_args, args, &hash_key);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(idx), zv);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        va_end(args);
        break;
      }
      va_end(args);
    }
  } else {
    for (idx = 0; idx < ht->nNumUsed; idx++) {
      Bucket *p = ht->arData + idx;

      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
      va_start(args, num_args);
      hash_key.h = p->h;
      hash_key.key = p->key;

      result = apply_func(&p->val, num_args, args, &hash_key);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_del_el(ht, HT_IDX_TO_HASH(idx), p);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        va_end(args);
        break;
      }
      va_end(args);
    }
  }
}


ZEND_API void ZEND_FASTCALL zend_hash_reverse_apply(HashTable *ht, apply_func_t apply_func)
{
  uint32_t idx;
  int result;

  IS_CONSISTENT(ht);

  idx = ht->nNumUsed;
  if (HT_IS_PACKED(ht)) {
    zval *zv;

    while (idx > 0) {
      idx--;
      zv = ht->arPacked + idx;
      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;

      result = apply_func(zv);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_packed_del_val(ht, HT_IDX_TO_HASH(idx), zv);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        break;
      }
    }
  } else {
    Bucket *p;

    while (idx > 0) {
      idx--;
      p = ht->arData + idx;
      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;

      result = apply_func(&p->val);

      if (result & ZEND_HASH_APPLY_REMOVE) {
        HT_ASSERT_RC1(ht);
        _zend_hash_del_el(ht, HT_IDX_TO_HASH(idx), p);
      }
      if (result & ZEND_HASH_APPLY_STOP) {
        break;
      }
    }
  }
}


ZEND_API void ZEND_FASTCALL zend_hash_copy(HashTable *target, const HashTable *source, copy_ctor_func_t pCopyConstructor)
{
  uint32_t idx;
  zval *new_entry, *data;

  IS_CONSISTENT(source);
  IS_CONSISTENT(target);
  HT_ASSERT_RC1(target);

  if (HT_IS_PACKED(source)) {
    for (idx = 0; idx < source->nNumUsed; idx++) {
      zval *zv = source->arPacked + idx;
      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;

      new_entry = zend_hash_index_update(target, idx, zv);
      if (pCopyConstructor) {
        pCopyConstructor(new_entry);
      }
    }
    return;
  }

  for (idx = 0; idx < source->nNumUsed; idx++) {
    Bucket *p = source->arData + idx;

    if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;

    /* INDIRECT element may point to UNDEF-ined slots */
    data = &p->val;
    if (Z_TYPE_P(data) == IS_INDIRECT) {
      data = Z_INDIRECT_P(data);
      if (UNEXPECTED(Z_TYPE_P(data) == IS_UNDEF)) {
        continue;
      }
    }
    if (p->key) {
      new_entry = zend_hash_update(target, p->key, data);
    } else {
      new_entry = zend_hash_index_update(target, p->h, data);
    }
    if (pCopyConstructor) {
      pCopyConstructor(new_entry);
    }
  }
}


static zend_always_inline bool zend_array_dup_value(const HashTable *source, zval *data, zval *dest, bool packed, bool with_holes)
{
  if (with_holes) {
    if (!packed && Z_TYPE_INFO_P(data) == IS_INDIRECT) {
      data = Z_INDIRECT_P(data);
    }
    if (UNEXPECTED(Z_TYPE_INFO_P(data) == IS_UNDEF)) {
      return 0;
    }
  } else if (!packed) {
    /* INDIRECT element may point to UNDEF-ined slots */
    if (Z_TYPE_INFO_P(data) == IS_INDIRECT) {
      data = Z_INDIRECT_P(data);
      if (UNEXPECTED(Z_TYPE_INFO_P(data) == IS_UNDEF)) {
        return 0;
      }
    }
  }

  do {
    if (Z_OPT_REFCOUNTED_P(data)) {
      if (Z_ISREF_P(data) && Z_REFCOUNT_P(data) == 1 &&
          (Z_TYPE_P(Z_REFVAL_P(data)) != IS_ARRAY ||
            Z_ARRVAL_P(Z_REFVAL_P(data)) != source)) {
        data = Z_REFVAL_P(data);
        if (!Z_OPT_REFCOUNTED_P(data)) {
          break;
        }
      }
      Z_ADDREF_P(data);
    }
  } while (0);
  ZVAL_COPY_VALUE(dest, data);

  return 1;
}

static zend_always_inline bool zend_array_dup_element(const HashTable *source, HashTable *target, uint32_t idx, Bucket *p, Bucket *q, bool packed, bool static_keys, bool with_holes)
{
  if (!zend_array_dup_value(source, &p->val, &q->val, packed, with_holes)) {
    return 0;
  }

  if (!packed) {
    uint32_t nIndex;

    q->h = p->h;
    q->key = p->key;
    if (!static_keys && q->key) {
      zend_string_addref(q->key);
    }

    nIndex = q->h | target->nTableMask;
    Z_NEXT(q->val) = HT_HASH(target, nIndex);
    HT_HASH(target, nIndex) = HT_IDX_TO_HASH(idx);
  }
  return 1;
}

// We need to duplicate iterators to be able to search through all copy-on-write copies to find the actually iterated HashTable and position back
static void zend_array_dup_ht_iterators(const HashTable *source, HashTable *target) {
  uint32_t iter_index = 0;
  uint32_t end_index = EG(ht_iterators_used);

  while (iter_index != end_index) {
    HashTableIterator *iter = &EG(ht_iterators)[iter_index];
    if (iter->ht == source) {
      uint32_t copy_idx = zend_hash_iterator_add(target, iter->pos);
      /* Refetch iter because the memory may be reallocated. */
      iter = &EG(ht_iterators)[iter_index];
      HashTableIterator *copy_iter = EG(ht_iterators) + copy_idx;
      copy_iter->next_copy = iter->next_copy;
      iter->next_copy = copy_idx;
    }
    iter_index++;
  }
}

static zend_always_inline void zend_array_dup_packed_elements(const HashTable *source, HashTable *target, bool with_holes)
{
  zval *p = source->arPacked;
  zval *q = target->arPacked;
  const zval *end = p + source->nNumUsed;

  do {
    if (!zend_array_dup_value(source, p, q, 1, with_holes)) {
      if (with_holes) {
        ZVAL_UNDEF(q);
      }
    }
    p++; q++;
  } while (p != end);

  if (UNEXPECTED(HT_HAS_ITERATORS(source))) {
    zend_array_dup_ht_iterators(source, target);
  }
}

static zend_always_inline uint32_t zend_array_dup_elements(const HashTable *source, HashTable *target, bool static_keys, bool with_holes)
{
  uint32_t idx = 0;
  Bucket *p = source->arData;
  Bucket *q = target->arData;
  const Bucket *end = p + source->nNumUsed;

  if (UNEXPECTED(HT_HAS_ITERATORS(source))) {
    zend_array_dup_ht_iterators(source, target);
  }

  do {
    if (!zend_array_dup_element(source, target, idx, p, q, 0, static_keys, with_holes)) {
      uint32_t target_idx = idx;

      idx++; p++;
      if (EXPECTED(!HT_HAS_ITERATORS(target))) {
        while (p != end) {
          if (zend_array_dup_element(source, target, target_idx, p, q, 0, static_keys, with_holes)) {
            if (source->nInternalPointer == idx) {
              target->nInternalPointer = target_idx;
            }
            target_idx++; q++;
          }
          idx++; p++;
        }
      } else {
        target->nNumUsed = source->nNumUsed;
        uint32_t iter_pos = zend_hash_iterators_lower_pos(target, idx);

        while (p != end) {
          if (zend_array_dup_element(source, target, target_idx, p, q, 0, static_keys, with_holes)) {
            if (source->nInternalPointer == idx) {
              target->nInternalPointer = target_idx;
            }
            if (UNEXPECTED(idx >= iter_pos)) {
              do {
                zend_hash_iterators_update(target, iter_pos, target_idx);
                iter_pos = zend_hash_iterators_lower_pos(target, iter_pos + 1);
              } while (iter_pos < idx);
            }
            target_idx++; q++;
          }
          idx++; p++;
        }
      }
      return target_idx;
    }
    idx++; p++; q++;
  } while (p != end);
  return idx;
}

ZEND_API HashTable* ZEND_FASTCALL zend_array_dup(const HashTable *source)
{
  uint32_t idx;
  HashTable *target;

  IS_CONSISTENT(source);

  ALLOC_HASHTABLE(target);
  GC_SET_REFCOUNT(target, 1);
  GC_TYPE_INFO(target) = GC_ARRAY;

  target->pDestructor = ZVAL_PTR_DTOR;

  if (source->nNumOfElements == 0) {
    HT_FLAGS(target) = HASH_FLAG_UNINITIALIZED;
    target->nTableMask = HT_MIN_MASK;
    target->nNumUsed = 0;
    target->nNumOfElements = 0;
    target->nNextFreeElement = source->nNextFreeElement;
    target->nInternalPointer = 0;
    target->nTableSize = HT_MIN_SIZE;
    HT_SET_DATA_ADDR(target, &uninitialized_bucket);
  } else if (GC_FLAGS(source) & IS_ARRAY_IMMUTABLE) {
    HT_FLAGS(target) = HT_FLAGS(source) & HASH_FLAG_MASK;
    target->nTableMask = source->nTableMask;
    target->nNumUsed = source->nNumUsed;
    target->nNumOfElements = source->nNumOfElements;
    target->nNextFreeElement = source->nNextFreeElement;
    target->nTableSize = source->nTableSize;
    if (HT_IS_PACKED(source)) {
      HT_SET_DATA_ADDR(target, emalloc(HT_PACKED_SIZE(target)));
      target->nInternalPointer = source->nInternalPointer;
      memcpy(HT_GET_DATA_ADDR(target), HT_GET_DATA_ADDR(source), HT_PACKED_USED_SIZE(source));
    } else {
      HT_SET_DATA_ADDR(target, emalloc(HT_SIZE(target)));
      target->nInternalPointer = source->nInternalPointer;
      memcpy(HT_GET_DATA_ADDR(target), HT_GET_DATA_ADDR(source), HT_USED_SIZE(source));
    }
  } else if (HT_IS_PACKED(source)) {
    HT_FLAGS(target) = HT_FLAGS(source) & HASH_FLAG_MASK;
    target->nTableMask = HT_MIN_MASK;
    target->nNumUsed = source->nNumUsed;
    target->nNumOfElements = source->nNumOfElements;
    target->nNextFreeElement = source->nNextFreeElement;
    target->nTableSize = source->nTableSize;
    HT_SET_DATA_ADDR(target, emalloc(HT_PACKED_SIZE_EX(target->nTableSize, HT_MIN_MASK)));
    target->nInternalPointer =
      (source->nInternalPointer < source->nNumUsed) ?
        source->nInternalPointer : 0;

    HT_HASH_RESET_PACKED(target);

    if (HT_IS_WITHOUT_HOLES(target)) {
      zend_array_dup_packed_elements(source, target, 0);
    } else {
      zend_array_dup_packed_elements(source, target, 1);
    }
  } else {
    HT_FLAGS(target) = HT_FLAGS(source) & HASH_FLAG_MASK;
    target->nTableMask = source->nTableMask;
    target->nNextFreeElement = source->nNextFreeElement;
    target->nInternalPointer =
      (source->nInternalPointer < source->nNumUsed) ?
        source->nInternalPointer : 0;

    target->nTableSize = source->nTableSize;
    HT_SET_DATA_ADDR(target, emalloc(HT_SIZE(target)));
    HT_HASH_RESET(target);

    if (HT_HAS_STATIC_KEYS_ONLY(target)) {
      if (HT_IS_WITHOUT_HOLES(source)) {
        idx = zend_array_dup_elements(source, target, 1, 0);
      } else {
        idx = zend_array_dup_elements(source, target, 1, 1);
      }
    } else {
      if (HT_IS_WITHOUT_HOLES(source)) {
        idx = zend_array_dup_elements(source, target, 0, 0);
      } else {
        idx = zend_array_dup_elements(source, target, 0, 1);
      }
    }
    target->nNumUsed = idx;
    target->nNumOfElements = idx;
  }
  return target;
}

ZEND_API HashTable* zend_array_to_list(const HashTable *source)
{
  HashTable *result = _zend_new_array(zend_hash_num_elements(source));
  zend_hash_real_init_packed(result);

  ZEND_HASH_FILL_PACKED(result) {
    zval *entry;

    ZEND_HASH_FOREACH_VAL(source, entry) {
      if (UNEXPECTED(Z_ISREF_P(entry) && Z_REFCOUNT_P(entry) == 1)) {
        entry = Z_REFVAL_P(entry);
      }
      Z_TRY_ADDREF_P(entry);
      ZEND_HASH_FILL_ADD(entry);
    } ZEND_HASH_FOREACH_END();
  } ZEND_HASH_FILL_END();

  return result;
}


ZEND_API void ZEND_FASTCALL zend_hash_merge(HashTable *target, const HashTable *source, copy_ctor_func_t pCopyConstructor, bool overwrite)
{
  uint32_t idx;
  Bucket *p;
  zval *t, *s;

  IS_CONSISTENT(source);
  IS_CONSISTENT(target);
  HT_ASSERT_RC1(target);

  if (overwrite) {
    if (HT_IS_PACKED(source)) {
      for (idx = 0; idx < source->nNumUsed; idx++) {
        s = source->arPacked + idx;
        if (UNEXPECTED(Z_TYPE_P(s) == IS_UNDEF)) {
          continue;
        }
        t = zend_hash_index_update(target, idx, s);
        if (pCopyConstructor) {
          pCopyConstructor(t);
        }
      }
      return;
    }

    for (idx = 0; idx < source->nNumUsed; idx++) {
      p = source->arData + idx;
      s = &p->val;
      if (UNEXPECTED(Z_TYPE_P(s) == IS_INDIRECT)) {
        s = Z_INDIRECT_P(s);
      }
      if (UNEXPECTED(Z_TYPE_P(s) == IS_UNDEF)) {
        continue;
      }
      if (p->key) {
        t = _zend_hash_add_or_update_i(target, p->key, s, HASH_UPDATE | HASH_UPDATE_INDIRECT);
        if (pCopyConstructor) {
          pCopyConstructor(t);
        }
      } else {
        t = zend_hash_index_update(target, p->h, s);
        if (pCopyConstructor) {
          pCopyConstructor(t);
        }
      }
    }
  } else {
    if (HT_IS_PACKED(source)) {
      for (idx = 0; idx < source->nNumUsed; idx++) {
        s = source->arPacked + idx;
        if (UNEXPECTED(Z_TYPE_P(s) == IS_UNDEF)) {
          continue;
        }
        t = zend_hash_index_add(target, idx, s);
        if (t && pCopyConstructor) {
          pCopyConstructor(t);
        }
      }
      return;
    }

    for (idx = 0; idx < source->nNumUsed; idx++) {
      p = source->arData + idx;
      s = &p->val;
      if (UNEXPECTED(Z_TYPE_P(s) == IS_INDIRECT)) {
        s = Z_INDIRECT_P(s);
      }
      if (UNEXPECTED(Z_TYPE_P(s) == IS_UNDEF)) {
        continue;
      }
      if (p->key) {
        t = _zend_hash_add_or_update_i(target, p->key, s, HASH_ADD | HASH_UPDATE_INDIRECT);
        if (t && pCopyConstructor) {
          pCopyConstructor(t);
        }
      } else {
        t = zend_hash_index_add(target, p->h, s);
        if (t && pCopyConstructor) {
          pCopyConstructor(t);
        }
      }
    }
  }
}


static bool ZEND_FASTCALL zend_hash_replace_checker_wrapper(HashTable *target, zval *source_data, zend_ulong h, zend_string *key, void *pParam, merge_checker_func_t merge_checker_func)
{
  zend_hash_key hash_key;

  hash_key.h = h;
  hash_key.key = key;
  return merge_checker_func(target, source_data, &hash_key, pParam);
}


ZEND_API void ZEND_FASTCALL zend_hash_merge_ex(HashTable *target, const HashTable *source, copy_ctor_func_t pCopyConstructor, merge_checker_func_t pMergeSource, void *pParam)
{
  uint32_t idx;
  Bucket *p;
  zval *t;

  IS_CONSISTENT(source);
  IS_CONSISTENT(target);
  HT_ASSERT_RC1(target);

  ZEND_ASSERT(!HT_IS_PACKED(source));
  for (idx = 0; idx < source->nNumUsed; idx++) {
    p = source->arData + idx;
    if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
    if (zend_hash_replace_checker_wrapper(target, &p->val, p->h, p->key, pParam, pMergeSource)) {
      t = zend_hash_update(target, p->key, &p->val);
      if (pCopyConstructor) {
        pCopyConstructor(t);
      }
    }
  }
}


/* Returns the hash table data if found and NULL if not. */
ZEND_API zval* ZEND_FASTCALL zend_hash_find(const HashTable *ht, zend_string *key)
{
  Bucket *p;

  IS_CONSISTENT(ht);

  (void)zend_string_hash_val(key);
  p = zend_hash_find_bucket(ht, key);
  return p ? &p->val : NULL;
}

ZEND_API zval* ZEND_FASTCALL zend_hash_find_known_hash(const HashTable *ht, const zend_string *key)
{
  Bucket *p;

  IS_CONSISTENT(ht);

  p = zend_hash_find_bucket(ht, key);
  return p ? &p->val : NULL;
}

ZEND_API zval* ZEND_FASTCALL zend_hash_str_find(const HashTable *ht, const char *str, size_t len)
{
  zend_ulong h;
  Bucket *p;

  IS_CONSISTENT(ht);

  h = zend_inline_hash_func(str, len);
  p = zend_hash_str_find_bucket(ht, str, len, h);
  return p ? &p->val : NULL;
}

ZEND_API zval* ZEND_FASTCALL zend_hash_index_find(const HashTable *ht, zend_ulong h)
{
  Bucket *p;

  IS_CONSISTENT(ht);

  if (HT_IS_PACKED(ht)) {
    if (h < ht->nNumUsed) {
      zval *zv = ht->arPacked + h;

      if (Z_TYPE_P(zv) != IS_UNDEF) {
        return zv;
      }
    }
    return NULL;
  }

  p = zend_hash_index_find_bucket(ht, h);
  return p ? &p->val : NULL;
}

ZEND_API zval* ZEND_FASTCALL _zend_hash_index_find(const HashTable *ht, zend_ulong h)
{
  Bucket *p;

  IS_CONSISTENT(ht);
  ZEND_ASSERT(!HT_IS_PACKED(ht));

  p = zend_hash_index_find_bucket(ht, h);
  return p ? &p->val : NULL;
}

ZEND_API void ZEND_FASTCALL zend_hash_internal_pointer_reset_ex(const HashTable *ht, HashPosition *pos)
{
  IS_CONSISTENT(ht);
  HT_ASSERT(ht, &ht->nInternalPointer != pos || GC_REFCOUNT(ht) == 1);
  *pos = _zend_hash_get_valid_pos(ht, 0);
}


/* This function will be extremely optimized by remembering
 * the end of the list
 */
ZEND_API void ZEND_FASTCALL zend_hash_internal_pointer_end_ex(const HashTable *ht, HashPosition *pos)
{
  uint32_t idx;

  IS_CONSISTENT(ht);
  HT_ASSERT(ht, &ht->nInternalPointer != pos || GC_REFCOUNT(ht) == 1);

  idx = ht->nNumUsed;
  if (HT_IS_PACKED(ht)) {
    while (idx > 0) {
      idx--;
      if (Z_TYPE(ht->arPacked[idx]) != IS_UNDEF) {
        *pos = idx;
        return;
      }
    }
  } else {
    while (idx > 0) {
      idx--;
      if (Z_TYPE(ht->arData[idx].val) != IS_UNDEF) {
        *pos = idx;
        return;
      }
    }
  }
  *pos = ht->nNumUsed;
}


ZEND_API zend_result ZEND_FASTCALL zend_hash_move_forward_ex(const HashTable *ht, HashPosition *pos)
{
  uint32_t idx;

  IS_CONSISTENT(ht);
  HT_ASSERT(ht, &ht->nInternalPointer != pos || GC_REFCOUNT(ht) == 1);

  idx = _zend_hash_get_valid_pos(ht, *pos);
  if (idx < ht->nNumUsed) {
    if (HT_IS_PACKED(ht)) {
      while (1) {
        idx++;
        if (idx >= ht->nNumUsed) {
          *pos = ht->nNumUsed;
          return SUCCESS;
        }
        if (Z_TYPE(ht->arPacked[idx]) != IS_UNDEF) {
          *pos = idx;
          return SUCCESS;
        }
      }
    } else {
      while (1) {
        idx++;
        if (idx >= ht->nNumUsed) {
          *pos = ht->nNumUsed;
          return SUCCESS;
        }
        if (Z_TYPE(ht->arData[idx].val) != IS_UNDEF) {
          *pos = idx;
          return SUCCESS;
        }
      }
    }
  } else {
    return FAILURE;
  }
}

ZEND_API zend_result ZEND_FASTCALL zend_hash_move_backwards_ex(const HashTable *ht, HashPosition *pos)
{
  uint32_t idx = *pos;

  IS_CONSISTENT(ht);
  HT_ASSERT(ht, &ht->nInternalPointer != pos || GC_REFCOUNT(ht) == 1);

  if (idx < ht->nNumUsed) {
    if (HT_IS_PACKED(ht)) {
      while (idx > 0) {
        idx--;
        if (Z_TYPE(ht->arPacked[idx]) != IS_UNDEF) {
          *pos = idx;
          return SUCCESS;
        }
      }
    } else {
      while (idx > 0) {
        idx--;
        if (Z_TYPE(ht->arData[idx].val) != IS_UNDEF) {
          *pos = idx;
          return SUCCESS;
        }
      }
    }
    *pos = ht->nNumUsed;
    return SUCCESS;
  } else {
    return FAILURE;
  }
}


/* This function should be made binary safe  */
ZEND_API int ZEND_FASTCALL zend_hash_get_current_key_ex(const HashTable *ht, zend_string **str_index, zend_ulong *num_index, const HashPosition *pos)
{
  uint32_t idx;
  Bucket *p;

  IS_CONSISTENT(ht);
  idx = _zend_hash_get_valid_pos(ht, *pos);
  if (idx < ht->nNumUsed) {
    if (HT_IS_PACKED(ht)) {
      *num_index = idx;
      return HASH_KEY_IS_LONG;
    }
    p = ht->arData + idx;
    if (p->key) {
      *str_index = p->key;
      return HASH_KEY_IS_STRING;
    } else {
      *num_index = p->h;
      return HASH_KEY_IS_LONG;
    }
  }
  return HASH_KEY_NON_EXISTENT;
}

ZEND_API void ZEND_FASTCALL zend_hash_get_current_key_zval_ex(const HashTable *ht, zval *key, const HashPosition *pos)
{
  uint32_t idx;
  Bucket *p;

  IS_CONSISTENT(ht);
  idx = _zend_hash_get_valid_pos(ht, *pos);
  if (idx >= ht->nNumUsed) {
    ZVAL_NULL(key);
  } else {
    if (HT_IS_PACKED(ht)) {
      ZVAL_LONG(key, idx);
      return;
    }
    p = ht->arData + idx;
    if (p->key) {
      ZVAL_STR_COPY(key, p->key);
    } else {
      ZVAL_LONG(key, p->h);
    }
  }
}

ZEND_API int ZEND_FASTCALL zend_hash_get_current_key_type_ex(const HashTable *ht, const HashPosition *pos)
{
  uint32_t idx;
  Bucket *p;

  IS_CONSISTENT(ht);
  idx = _zend_hash_get_valid_pos(ht, *pos);
  if (idx < ht->nNumUsed) {
    if (HT_IS_PACKED(ht)) {
      return HASH_KEY_IS_LONG;
    }
    p = ht->arData + idx;
    if (p->key) {
      return HASH_KEY_IS_STRING;
    } else {
      return HASH_KEY_IS_LONG;
    }
  }
  return HASH_KEY_NON_EXISTENT;
}


ZEND_API zval* ZEND_FASTCALL zend_hash_get_current_data_ex(const HashTable *ht, const HashPosition *pos)
{
  uint32_t idx;
  Bucket *p;

  IS_CONSISTENT(ht);
  idx = _zend_hash_get_valid_pos(ht, *pos);
  if (idx < ht->nNumUsed) {
    if (HT_IS_PACKED(ht)) {
      return &ht->arPacked[idx];
    }
    p = ht->arData + idx;
    return &p->val;
  } else {
    return NULL;
  }
}

ZEND_API void zend_hash_bucket_swap(Bucket *p, Bucket *q)
{
  zval val;
  zend_ulong h;
  zend_string *key;

  val = p->val;
  h = p->h;
  key = p->key;

  p->val = q->val;
  p->h = q->h;
  p->key = q->key;

  q->val = val;
  q->h = h;
  q->key = key;
}

ZEND_API void zend_hash_bucket_renum_swap(Bucket *p, Bucket *q)
{
  zval val;

  val = p->val;
  p->val = q->val;
  q->val = val;
}

ZEND_API void zend_hash_bucket_packed_swap(Bucket *p, Bucket *q)
{
  zval val;
  zend_ulong h;

  val = p->val;
  h = p->h;

  p->val = q->val;
  p->h = q->h;

  q->val = val;
  q->h = h;
}

static void zend_hash_sort_internal(HashTable *ht, sort_func_t sort, bucket_compare_func_t compar, bool renumber)
{
  Bucket *p;
  uint32_t i, j;

  IS_CONSISTENT(ht);

  if (!(ht->nNumOfElements>1) && !(renumber && ht->nNumOfElements>0)) {
    /* Doesn't require sorting */
    return;
  }

  if (HT_IS_PACKED(ht)) {
    zend_hash_packed_to_hash(ht); // TODO: ???
  }

  if (HT_IS_WITHOUT_HOLES(ht)) {
    /* Store original order of elements in extra space to allow stable sorting. */
    for (i = 0; i < ht->nNumUsed; i++) {
      Z_EXTRA(ht->arData[i].val) = i;
    }
  } else {
    /* Remove holes and store original order. */
    for (j = 0, i = 0; j < ht->nNumUsed; j++) {
      p = ht->arData + j;
      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
      if (i != j) {
        ht->arData[i] = *p;
      }
      Z_EXTRA(ht->arData[i].val) = i;
      i++;
    }
    ht->nNumUsed = i;
  }

  if (!HT_IS_PACKED(ht)) {
    /* We broke the hash collisions chains overriding Z_NEXT() by Z_EXTRA().
     * Reset the hash headers table as well to avoid possible inconsistent
     * access on recursive data structures.
       *
       * See Zend/tests/bug63882_2.phpt
     */
    HT_HASH_RESET(ht);
  }

  sort((void *)ht->arData, ht->nNumUsed, sizeof(Bucket), (compare_func_t) compar,
      (swap_func_t)(renumber? zend_hash_bucket_renum_swap :
        (HT_IS_PACKED(ht) ? zend_hash_bucket_packed_swap : zend_hash_bucket_swap)));

  ht->nInternalPointer = 0;

  if (renumber) {
    for (j = 0; j < i; j++) {
      p = ht->arData + j;
      p->h = j;
      if (p->key) {
        zend_string_release(p->key);
        p->key = NULL;
      }
    }

    ht->nNextFreeElement = i;
  }
  if (HT_IS_PACKED(ht)) {
    if (!renumber) {
      zend_hash_packed_to_hash(ht);
    }
  } else {
    if (renumber) {
      void *new_data, *old_data = HT_GET_DATA_ADDR(ht);
      Bucket *old_buckets = ht->arData;
      zval *zv;

      new_data = pemalloc(HT_PACKED_SIZE_EX(ht->nTableSize, HT_MIN_MASK), (GC_FLAGS(ht) & IS_ARRAY_PERSISTENT));
      HT_FLAGS(ht) |= HASH_FLAG_PACKED | HASH_FLAG_STATIC_KEYS;
      ht->nTableMask = HT_MIN_MASK;
      HT_SET_DATA_ADDR(ht, new_data);
      p = old_buckets;
      zv = ht->arPacked;
      for (i = 0; i < ht->nTableSize; i++) {
        ZVAL_COPY_VALUE(zv, &p->val);
        zv++;
        p++;
      }
      pefree(old_data, GC_FLAGS(ht) & IS_ARRAY_PERSISTENT);
      HT_HASH_RESET_PACKED(ht);
    } else {
      zend_hash_rehash(ht);
    }
  }
}

ZEND_API void ZEND_FASTCALL zend_hash_sort_ex(HashTable *ht, sort_func_t sort, bucket_compare_func_t compar, bool renumber)
{
  HT_ASSERT_RC1(ht);
  zend_hash_sort_internal(ht, sort, compar, renumber);
}

ZEND_API void ZEND_FASTCALL zend_array_sort_ex(HashTable *ht, sort_func_t sort, bucket_compare_func_t compar, bool renumber)
{
  HT_ASSERT_RC1(ht);

  /* Unpack the array early to avoid RCn assertion failures. */
  if (HT_IS_PACKED(ht)) {
    zend_hash_packed_to_hash(ht);
  }

  /* Adding a refcount prevents the array from going away. */
  GC_ADDREF(ht);

  zend_hash_sort_internal(ht, sort, compar, renumber);

  if (UNEXPECTED(GC_DELREF(ht) == 0)) {
    zend_array_destroy(ht);
  } else {
    gc_check_possible_root((zend_refcounted *)ht);
  }
}

static zend_always_inline int zend_hash_compare_impl(const HashTable *ht1, const HashTable *ht2, compare_func_t compar, bool ordered) {
  uint32_t idx1, idx2;
  zend_string *key1, *key2;
  zend_ulong h1, h2;
  zval *pData1, *pData2;;
  int result;

  if (ht1->nNumOfElements != ht2->nNumOfElements) {
    return ht1->nNumOfElements > ht2->nNumOfElements ? 1 : -1;
  }

  for (idx1 = 0, idx2 = 0; idx1 < ht1->nNumUsed; idx1++) {
    if (HT_IS_PACKED(ht1)) {
      pData1 = ht1->arPacked + idx1;
      h1 = idx1;
      key1 = NULL;
    } else {
      Bucket *p = ht1->arData + idx1;
      pData1 = &p->val;
      h1 = p->h;
      key1 = p->key;
    }

    if (Z_TYPE_P(pData1) == IS_UNDEF) continue;
    if (ordered) {
      if (HT_IS_PACKED(ht2)) {
        while (1) {
          ZEND_ASSERT(idx2 != ht2->nNumUsed);
          pData2 = ht2->arPacked + idx2;
          h2 = idx2;
          key2 = NULL;
          if (Z_TYPE_P(pData2) != IS_UNDEF) break;
          idx2++;
        }
      } else {
        while (1) {
          Bucket *p;
          ZEND_ASSERT(idx2 != ht2->nNumUsed);
          p = ht2->arData + idx2;
          pData2 = &p->val;
          h2 = p->h;
          key2 = p->key;
          if (Z_TYPE_P(pData2) != IS_UNDEF) break;
          idx2++;
        }
      }
      if (key1 == NULL && key2 == NULL) { /* numeric indices */
        if (h1 != h2) {
          return h1 > h2 ? 1 : -1;
        }
      } else if (key1 != NULL && key2 != NULL) { /* string indices */
        if (ZSTR_LEN(key1) != ZSTR_LEN(key2)) {
          return ZSTR_LEN(key1) > ZSTR_LEN(key2) ? 1 : -1;
        }

        result = memcmp(ZSTR_VAL(key1), ZSTR_VAL(key2), ZSTR_LEN(key1));
        if (result != 0) {
          return result;
        }
      } else {
        /* Mixed key types: A string key is considered as larger */
        return key1 != NULL ? 1 : -1;
      }
      idx2++;
    } else {
      if (key1 == NULL) { /* numeric index */
        pData2 = zend_hash_index_find(ht2, h1);
        if (pData2 == NULL) {
          return 1;
        }
      } else { /* string index */
        pData2 = zend_hash_find(ht2, key1);
        if (pData2 == NULL) {
          return 1;
        }
      }
    }

    if (Z_TYPE_P(pData1) == IS_INDIRECT) {
      pData1 = Z_INDIRECT_P(pData1);
    }
    if (Z_TYPE_P(pData2) == IS_INDIRECT) {
      pData2 = Z_INDIRECT_P(pData2);
    }

    if (Z_TYPE_P(pData1) == IS_UNDEF) {
      if (Z_TYPE_P(pData2) != IS_UNDEF) {
        return -1;
      }
    } else if (Z_TYPE_P(pData2) == IS_UNDEF) {
      return 1;
    } else {
      result = compar(pData1, pData2);
      if (result != 0) {
        return result;
      }
    }
  }

  return 0;
}

ZEND_API int zend_hash_compare(HashTable *ht1, HashTable *ht2, compare_func_t compar, bool ordered)
{
  int result;
  IS_CONSISTENT(ht1);
  IS_CONSISTENT(ht2);

  if (ht1 == ht2) {
    return 0;
  }

  /* It's enough to protect only one of the arrays.
   * The second one may be referenced from the first and this may cause
   * false recursion detection.
   */
  if (UNEXPECTED(GC_IS_RECURSIVE(ht1))) {
    zend_throw_error(NULL, "Nesting level too deep - recursive dependency?");
    return ZEND_UNCOMPARABLE;
  }

  GC_TRY_PROTECT_RECURSION(ht1);
  result = zend_hash_compare_impl(ht1, ht2, compar, ordered);
  GC_TRY_UNPROTECT_RECURSION(ht1);

  return result;
}


ZEND_API zval* ZEND_FASTCALL zend_hash_minmax(const HashTable *ht, compare_func_t compar, uint32_t flag)
{
  uint32_t idx;
  zval *res;

  IS_CONSISTENT(ht);

  if (ht->nNumOfElements == 0 ) {
    return NULL;
  }

  if (HT_IS_PACKED(ht)) {
    zval *zv;

    idx = 0;
    while (1) {
      if (idx == ht->nNumUsed) {
        return NULL;
      }
      if (Z_TYPE(ht->arPacked[idx]) != IS_UNDEF) break;
      idx++;
    }
    res = ht->arPacked + idx;
    for (; idx < ht->nNumUsed; idx++) {
      zv = ht->arPacked + idx;
      if (UNEXPECTED(Z_TYPE_P(zv) == IS_UNDEF)) continue;

      if (flag) {
        if (compar(res, zv) < 0) { /* max */
          res = zv;
        }
      } else {
        if (compar(res, zv) > 0) { /* min */
          res = zv;
        }
      }
    }
  } else {
    Bucket *p;

    idx = 0;
    while (1) {
      if (idx == ht->nNumUsed) {
        return NULL;
      }
      if (Z_TYPE(ht->arData[idx].val) != IS_UNDEF) break;
      idx++;
    }
    res = &ht->arData[idx].val;
    for (; idx < ht->nNumUsed; idx++) {
      p = ht->arData + idx;
      if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;

      if (flag) {
        if (compar(res, &p->val) < 0) { /* max */
          res = &p->val;
        }
      } else {
        if (compar(res, &p->val) > 0) { /* min */
          res = &p->val;
        }
      }
    }
  }
  return res;
}

ZEND_API bool ZEND_FASTCALL _zend_handle_numeric_str_ex(const char *key, size_t length, zend_ulong *idx)
{
  const char *tmp = key;

  const char *end = key + length;

  if (*tmp == '-') {
    tmp++;
  }

  if ((*tmp == '0' && length > 1) /* numbers with leading zeros */
   || (end - tmp > MAX_LENGTH_OF_LONG - 1) /* number too long */
   || (SIZEOF_ZEND_LONG == 4 &&
       end - tmp == MAX_LENGTH_OF_LONG - 1 &&
       *tmp > '2')) { /* overflow */
    return 0;
  }
  *idx = (*tmp - '0');
  while (1) {
    ++tmp;
    if (tmp == end) {
      if (*key == '-') {
        if (*idx-1 > ZEND_LONG_MAX) { /* overflow */
          return 0;
        }
        *idx = 0 - *idx;
      } else if (*idx > ZEND_LONG_MAX) { /* overflow */
        return 0;
      }
      return 1;
    }
    if (*tmp <= '9' && *tmp >= '0') {
      *idx = (*idx * 10) + (*tmp - '0');
    } else {
      return 0;
    }
  }
}

/* Takes a "symtable" hashtable (contains integer and non-numeric string keys)
 * and converts it to a "proptable" (contains only string keys).
 * If the symtable didn't need duplicating, its refcount is incremented.
 */
ZEND_API HashTable* ZEND_FASTCALL zend_symtable_to_proptable(HashTable *ht)
{
  zend_ulong num_key;
  zend_string *str_key;
  zval *zv;

  if (UNEXPECTED(HT_IS_PACKED(ht))) {
    goto convert;
  }

  ZEND_HASH_MAP_FOREACH_STR_KEY(ht, str_key) {
    if (!str_key) {
      goto convert;
    }
  } ZEND_HASH_FOREACH_END();

  if (!(GC_FLAGS(ht) & IS_ARRAY_IMMUTABLE)) {
    GC_ADDREF(ht);
  }

  return ht;

convert:
  {
    HashTable *new_ht = zend_new_array(zend_hash_num_elements(ht));

    ZEND_HASH_FOREACH_KEY_VAL(ht, num_key, str_key, zv) {
      if (!str_key) {
        str_key = zend_long_to_str(num_key);
        zend_string_delref(str_key);
      }
      do {
        if (Z_OPT_REFCOUNTED_P(zv)) {
          if (Z_ISREF_P(zv) && Z_REFCOUNT_P(zv) == 1) {
            zv = Z_REFVAL_P(zv);
            if (!Z_OPT_REFCOUNTED_P(zv)) {
              break;
            }
          }
          Z_ADDREF_P(zv);
        }
      } while (0);
      zend_hash_update(new_ht, str_key, zv);
    } ZEND_HASH_FOREACH_END();

    return new_ht;
  }
}

/* Takes a "proptable" hashtable (contains only string keys) and converts it to
 * a "symtable" (contains integer and non-numeric string keys).
 * If the proptable didn't need duplicating, its refcount is incremented.
 */
ZEND_API HashTable* ZEND_FASTCALL zend_proptable_to_symtable(HashTable *ht, bool always_duplicate)
{
  zend_ulong num_key;
  zend_string *str_key;
  zval *zv;

  if (!HT_IS_PACKED(ht)) {
    ZEND_HASH_MAP_FOREACH_STR_KEY(ht, str_key) {
      /* The `str_key &&` here might seem redundant: property tables should
       * only have string keys. Unfortunately, this isn't true, at the very
       * least because of ArrayObject, which stores a symtable where the
       * property table should be.
       */
      if (str_key && ZEND_HANDLE_NUMERIC(str_key, num_key)) {
        goto convert;
      }
    } ZEND_HASH_FOREACH_END();
  }

  if (always_duplicate) {
    return zend_array_dup(ht);
  }

  if (EXPECTED(!(GC_FLAGS(ht) & IS_ARRAY_IMMUTABLE))) {
    GC_ADDREF(ht);
  }

  return ht;

convert:
  {
    HashTable *new_ht = zend_new_array(zend_hash_num_elements(ht));

    ZEND_HASH_MAP_FOREACH_KEY_VAL_IND(ht, num_key, str_key, zv) {
      do {
        if (Z_OPT_REFCOUNTED_P(zv)) {
          if (Z_ISREF_P(zv) && Z_REFCOUNT_P(zv) == 1) {
            zv = Z_REFVAL_P(zv);
            if (!Z_OPT_REFCOUNTED_P(zv)) {
              break;
            }
          }
          Z_ADDREF_P(zv);
        }
      } while (0);
      /* Again, thank ArrayObject for `!str_key ||`. */
      if (!str_key || ZEND_HANDLE_NUMERIC(str_key, num_key)) {
        zend_hash_index_update(new_ht, num_key, zv);
      } else {
        zend_hash_update(new_ht, str_key, zv);
      }
    } ZEND_HASH_FOREACH_END();

    return new_ht;
  }
}

Coverage Report

Created: 2025-07-23 06:33