zend_alloc.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>                              |
   +----------------------------------------------------------------------+
*/
 
/*
 * zend_alloc is designed to be a modern CPU cache friendly memory manager
 * for PHP. Most ideas are taken from jemalloc and tcmalloc implementations.
 *
 * All allocations are split into 3 categories:
 *
 * Huge  - the size is greater than CHUNK size (~2M by default), allocation is
 *         performed using mmap(). The result is aligned on 2M boundary.
 *
 * Large - a number of 4096K pages inside a CHUNK. Large blocks
 *         are always aligned on page boundary.
 *
 * Small - less than 3/4 of page size. Small sizes are rounded up to nearest
 *         greater predefined small size (there are 30 predefined sizes:
 *         8, 16, 24, 32, ... 3072). Small blocks are allocated from
 *         RUNs. Each RUN is allocated as a single or few following pages.
 *         Allocation inside RUNs implemented using linked list of free
 *         elements. The result is aligned to 8 bytes.
 *
 * zend_alloc allocates memory from OS by CHUNKs, these CHUNKs and huge memory
 * blocks are always aligned to CHUNK boundary. So it's very easy to determine
 * the CHUNK owning the certain pointer. Regular CHUNKs reserve a single
 * page at start for special purpose. It contains bitset of free pages,
 * few bitset for available runs of predefined small sizes, map of pages that
 * keeps information about usage of each page in this CHUNK, etc.
 *
 * zend_alloc provides familiar emalloc/efree/erealloc API, but in addition it
 * provides specialized and optimized routines to allocate blocks of predefined
 * sizes (e.g. emalloc_2(), emallc_4(), ..., emalloc_large(), etc)
 * The library uses C preprocessor tricks that substitute calls to emalloc()
 * with more specialized routines when the requested size is known.
 */
 
#include "zend.h"
#include "zend_alloc.h"
#include "zend_globals.h"
#include "zend_hrtime.h"
#include "zend_operators.h"
#include "zend_multiply.h"
#include "zend_bitset.h"
#include "zend_mmap.h"
#include "zend_portability.h"
#include <signal.h>
 
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
 
#ifdef ZEND_WIN32
# include <wincrypt.h>
# include <process.h>
# include "win32/winutil.h"
# define getpid _getpid
typedef int pid_t;
#endif
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#ifdef __SANITIZE_ADDRESS__
# include <sanitizer/asan_interface.h>
#endif
 
#ifndef _WIN32
# include <sys/mman.h>
# ifndef MAP_ANON
#  ifdef MAP_ANONYMOUS
#   define MAP_ANON MAP_ANONYMOUS
#  endif
# endif
# ifndef MAP_FAILED
#  define MAP_FAILED ((void*)-1)
# endif
# ifndef MAP_POPULATE
#  define MAP_POPULATE 0
# endif
#  if defined(_SC_PAGESIZE) || (_SC_PAGE_SIZE)
#    define REAL_PAGE_SIZE _real_page_size
static size_t _real_page_size = ZEND_MM_PAGE_SIZE;
#  endif
# ifdef MAP_ALIGNED_SUPER
#    define MAP_HUGETLB MAP_ALIGNED_SUPER
# endif
#endif
 
#ifndef REAL_PAGE_SIZE
# define REAL_PAGE_SIZE ZEND_MM_PAGE_SIZE
#endif
 
/* NetBSD has an mremap() function with a signature that is incompatible with Linux (WTF?),
 * so pretend it doesn't exist. */
#ifndef __linux__
# undef HAVE_MREMAP
#endif
 
#ifndef __APPLE__
# define ZEND_MM_FD -1
#else
# include <mach/vm_statistics.h>
/* Mac allows to track anonymous page via vmmap per TAG id.
 * user land applications are allowed to take from 240 to 255.
 */
# define ZEND_MM_FD VM_MAKE_TAG(250U)
#endif
 
#ifndef ZEND_MM_STAT
# define ZEND_MM_STAT 1    /* track current and peak memory usage            */
#endif
#ifndef ZEND_MM_LIMIT
# define ZEND_MM_LIMIT 1   /* support for user-defined memory limit          */
#endif
#ifndef ZEND_MM_CUSTOM
# define ZEND_MM_CUSTOM 1  /* support for custom memory allocator            */
                           /* USE_ZEND_ALLOC=0 may switch to system malloc() */
#endif
#ifndef ZEND_MM_STORAGE
# define ZEND_MM_STORAGE 1 /* support for custom memory storage              */
#endif
#ifndef ZEND_MM_ERROR
# define ZEND_MM_ERROR 1   /* report system errors                           */
#endif
#ifndef ZEND_MM_HEAP_PROTECTION
# define ZEND_MM_HEAP_PROTECTION 1 /* protect heap against corruptions       */
#endif
 
#if ZEND_MM_HEAP_PROTECTION
/* Define ZEND_MM_MIN_USEABLE_BIN_SIZE to the size of two pointers */
# if UINTPTR_MAX == UINT64_MAX
#  define ZEND_MM_MIN_USEABLE_BIN_SIZE 16
# elif UINTPTR_MAX == UINT32_MAX
#  define ZEND_MM_MIN_USEABLE_BIN_SIZE 8
# else
#  error
# endif
# if ZEND_MM_MIN_USEABLE_BIN_SIZE < ZEND_MM_MIN_SMALL_SIZE
#  error
# endif
#else /* ZEND_MM_HEAP_PROTECTION */
# define ZEND_MM_MIN_USEABLE_BIN_SIZE ZEND_MM_MIN_SMALL_SIZE
#endif /* ZEND_MM_HEAP_PROTECTION */
 
#ifndef ZEND_MM_CHECK
# define ZEND_MM_CHECK(condition, message)  do { \
        if (UNEXPECTED(!(condition))) { \
            zend_mm_panic(message); \
        } \
    } while (0)
#endif
 
typedef uint32_t   zend_mm_page_info; /* 4-byte integer */
typedef zend_ulong zend_mm_bitset;    /* 4-byte or 8-byte integer */
 
#define ZEND_MM_ALIGNED_OFFSET(size, alignment) \
    (((size_t)(size)) & ((alignment) - 1))
#define ZEND_MM_ALIGNED_BASE(size, alignment) \
    (((size_t)(size)) & ~((alignment) - 1))
#define ZEND_MM_SIZE_TO_NUM(size, alignment) \
    (((size_t)(size) + ((alignment) - 1)) / (alignment))
 
#define ZEND_MM_BITSET_LEN      (sizeof(zend_mm_bitset) * 8)       /* 32 or 64 */
#define ZEND_MM_PAGE_MAP_LEN    (ZEND_MM_PAGES / ZEND_MM_BITSET_LEN) /* 16 or 8 */
 
typedef zend_mm_bitset zend_mm_page_map[ZEND_MM_PAGE_MAP_LEN];     /* 64B */
 
#define ZEND_MM_IS_FRUN                  0x00000000
#define ZEND_MM_IS_LRUN                  0x40000000
#define ZEND_MM_IS_SRUN                  0x80000000
 
#define ZEND_MM_LRUN_PAGES_MASK          0x000003ff
#define ZEND_MM_LRUN_PAGES_OFFSET        0
 
#define ZEND_MM_SRUN_BIN_NUM_MASK        0x0000001f
#define ZEND_MM_SRUN_BIN_NUM_OFFSET      0
 
#define ZEND_MM_SRUN_FREE_COUNTER_MASK   0x01ff0000
#define ZEND_MM_SRUN_FREE_COUNTER_OFFSET 16
 
#define ZEND_MM_NRUN_OFFSET_MASK         0x01ff0000
#define ZEND_MM_NRUN_OFFSET_OFFSET       16
 
#define ZEND_MM_LRUN_PAGES(info)         (((info) & ZEND_MM_LRUN_PAGES_MASK) >> ZEND_MM_LRUN_PAGES_OFFSET)
#define ZEND_MM_SRUN_BIN_NUM(info)       (((info) & ZEND_MM_SRUN_BIN_NUM_MASK) >> ZEND_MM_SRUN_BIN_NUM_OFFSET)
#define ZEND_MM_SRUN_FREE_COUNTER(info)  (((info) & ZEND_MM_SRUN_FREE_COUNTER_MASK) >> ZEND_MM_SRUN_FREE_COUNTER_OFFSET)
#define ZEND_MM_NRUN_OFFSET(info)        (((info) & ZEND_MM_NRUN_OFFSET_MASK) >> ZEND_MM_NRUN_OFFSET_OFFSET)
 
#define ZEND_MM_FRUN()                   ZEND_MM_IS_FRUN
#define ZEND_MM_LRUN(count)              (ZEND_MM_IS_LRUN | ((count) << ZEND_MM_LRUN_PAGES_OFFSET))
#define ZEND_MM_SRUN(bin_num)            (ZEND_MM_IS_SRUN | ((bin_num) << ZEND_MM_SRUN_BIN_NUM_OFFSET))
#define ZEND_MM_SRUN_EX(bin_num, count)  (ZEND_MM_IS_SRUN | ((bin_num) << ZEND_MM_SRUN_BIN_NUM_OFFSET) | ((count) << ZEND_MM_SRUN_FREE_COUNTER_OFFSET))
#define ZEND_MM_NRUN(bin_num, offset)    (ZEND_MM_IS_SRUN | ZEND_MM_IS_LRUN | ((bin_num) << ZEND_MM_SRUN_BIN_NUM_OFFSET) | ((offset) << ZEND_MM_NRUN_OFFSET_OFFSET))
 
#define ZEND_MM_BINS 30
 
#if UINTPTR_MAX == UINT64_MAX
#  define BSWAPPTR(u) ZEND_BYTES_SWAP64(u)
#else
#  define BSWAPPTR(u) ZEND_BYTES_SWAP32(u)
#endif
 
typedef struct  _zend_mm_page      zend_mm_page;
typedef struct  _zend_mm_bin       zend_mm_bin;
typedef struct  _zend_mm_free_slot zend_mm_free_slot;
typedef struct  _zend_mm_chunk     zend_mm_chunk;
typedef struct  _zend_mm_huge_list zend_mm_huge_list;
 
static bool zend_mm_use_huge_pages = false;
 
/*
 * Memory is retrieved from OS by chunks of fixed size 2MB.
 * Inside chunk it's managed by pages of fixed size 4096B.
 * So each chunk consists from 512 pages.
 * The first page of each chunk is reserved for chunk header.
 * It contains service information about all pages.
 *
 * free_pages - current number of free pages in this chunk
 *
 * free_tail  - number of continuous free pages at the end of chunk
 *
 * free_map   - bitset (a bit for each page). The bit is set if the corresponding
 *              page is allocated. Allocator for "large sizes" may easily find a
 *              free page (or a continuous number of pages) searching for zero
 *              bits.
 *
 * map        - contains service information for each page. (32-bits for each
 *              page).
 *    usage:
 *              (2 bits)
 *              FRUN - free page,
 *              LRUN - first page of "large" allocation
 *              SRUN - first page of a bin used for "small" allocation
 *
 *    lrun_pages:
 *              (10 bits) number of allocated pages
 *
 *    srun_bin_num:
 *              (5 bits) bin number (e.g. 0 for sizes 0-2, 1 for 3-4,
 *               2 for 5-8, 3 for 9-16 etc) see zend_alloc_sizes.h
 */
 
struct _zend_mm_heap {
#if ZEND_MM_CUSTOM
    int                use_custom_heap;
#endif
#if ZEND_MM_STORAGE
    zend_mm_storage   *storage;
#endif
#if ZEND_MM_STAT
    size_t             size;                    /* current memory usage */
    size_t             peak;                    /* peak memory usage */
#endif
    uintptr_t          shadow_key;              /* free slot shadow ptr xor key */
    zend_mm_free_slot *free_slot[ZEND_MM_BINS]; /* free lists for small sizes */
#if ZEND_MM_STAT || ZEND_MM_LIMIT
    size_t             real_size;               /* current size of allocated pages */
#endif
#if ZEND_MM_STAT
    size_t             real_peak;               /* peak size of allocated pages */
#endif
#if ZEND_MM_LIMIT
    size_t             limit;                   /* memory limit */
    int                overflow;                /* memory overflow flag */
#endif
 
    zend_mm_huge_list *huge_list;               /* list of huge allocated blocks */
 
    zend_mm_chunk     *main_chunk;
    zend_mm_chunk     *cached_chunks;         /* list of unused chunks */
    int                chunks_count;            /* number of allocated chunks */
    int                peak_chunks_count;      /* peak number of allocated chunks for current request */
    int                cached_chunks_count;      /* number of cached chunks */
    double             avg_chunks_count;        /* average number of chunks allocated per request */
    int                last_chunks_delete_boundary; /* number of chunks after last deletion */
    int                last_chunks_delete_count;    /* number of deletion over the last boundary */
#if ZEND_MM_CUSTOM
    struct {
        void      *(*_malloc)(size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
        void       (*_free)(void*  ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
        void      *(*_realloc)(void*, size_t  ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
        size_t     (*_gc)(void);
        void       (*_shutdown)(bool full, bool silent);
    } custom_heap;
    HashTable *tracked_allocs;
#endif
    pid_t pid;
    zend_random_bytes_insecure_state rand_state;
};
 
struct _zend_mm_chunk {
    zend_mm_heap      *heap;
    zend_mm_chunk     *next;
    zend_mm_chunk     *prev;
    uint32_t           free_pages;                /* number of free pages */
    uint32_t           free_tail;               /* number of free pages at the end of chunk */
    uint32_t           num;
    char               reserve[64 - (sizeof(void*) * 3 + sizeof(uint32_t) * 3)];
    zend_mm_heap       heap_slot;               /* used only in main chunk */
    zend_mm_page_map   free_map;                /* 512 bits or 64 bytes */
    zend_mm_page_info  map[ZEND_MM_PAGES];      /* 2 KB = 512 * 4 */
};
 
struct _zend_mm_page {
    char               bytes[ZEND_MM_PAGE_SIZE];
};
 
/*
 * bin - is one or few continuous pages (up to 8) used for allocation of
 * a particular "small size".
 */
struct _zend_mm_bin {
    char               bytes[ZEND_MM_PAGE_SIZE * 8];
};
 
struct _zend_mm_free_slot {
    zend_mm_free_slot *next_free_slot;
};
 
struct _zend_mm_huge_list {
    void              *ptr;
    size_t             size;
    zend_mm_huge_list *next;
#if ZEND_DEBUG
    zend_mm_debug_info dbg;
#endif
};
 
#define ZEND_MM_PAGE_ADDR(chunk, page_num) \
    ((void*)(((zend_mm_page*)(chunk)) + (page_num)))
 
#define _BIN_DATA_SIZE(num, size, elements, pages, x, y) size,
static const uint32_t bin_data_size[] = {
    ZEND_MM_BINS_INFO(_BIN_DATA_SIZE, x, y)
};
 
#define _BIN_DATA_ELEMENTS(num, size, elements, pages, x, y) elements,
static const uint32_t bin_elements[] = {
    ZEND_MM_BINS_INFO(_BIN_DATA_ELEMENTS, x, y)
};
 
#define _BIN_DATA_PAGES(num, size, elements, pages, x, y) pages,
static const uint32_t bin_pages[] = {
    ZEND_MM_BINS_INFO(_BIN_DATA_PAGES, x, y)
};
 
#if ZEND_DEBUG
ZEND_COLD void zend_debug_alloc_output(char *format, ...)
{
    char output_buf[256];
    va_list args;
 
    va_start(args, format);
    vsprintf(output_buf, format, args);
    va_end(args);
 
#ifdef ZEND_WIN32
    OutputDebugString(output_buf);
#else
    fprintf(stderr, "%s", output_buf);
#endif
}
#endif
 
static ZEND_COLD ZEND_NORETURN void zend_mm_panic(const char *message)
{
    fprintf(stderr, "%s\n", message);
/* See http://support.microsoft.com/kb/190351 */
#ifdef ZEND_WIN32
    fflush(stderr);
#endif
#if ZEND_DEBUG && defined(HAVE_KILL) && defined(HAVE_GETPID)
    kill(getpid(), SIGSEGV);
#endif
    abort();
}
 
static ZEND_COLD ZEND_NORETURN void zend_mm_safe_error(zend_mm_heap *heap,
    const char *format,
    size_t limit,
#if ZEND_DEBUG
    const char *filename,
    uint32_t lineno,
#endif
    size_t size)
{
 
    heap->overflow = 1;
    zend_try {
        zend_error_noreturn(E_ERROR,
            format,
            limit,
#if ZEND_DEBUG
            filename,
            lineno,
#endif
            size);
    } zend_catch {
    }  zend_end_try();
    heap->overflow = 0;
    zend_bailout();
    exit(1);
}
 
#ifdef _WIN32
static void stderr_last_error(char *msg)
{
    DWORD err = GetLastError();
    char *buf = php_win32_error_to_msg(err);
 
    if (!buf[0]) {
        fprintf(stderr, "\n%s: [0x%08lx]\n", msg, err);
    }
    else {
        fprintf(stderr, "\n%s: [0x%08lx] %s\n", msg, err, buf);
    }
 
    php_win32_error_msg_free(buf);
}
#endif
 
/*****************/
/* OS Allocation */
/*****************/
 
static void zend_mm_munmap(void *addr, size_t size)
{
#ifdef _WIN32
    if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
        if (GetLastError() != ERROR_INVALID_ADDRESS) {
#if ZEND_MM_ERROR
            stderr_last_error("VirtualFree() failed");
#endif
            return;
        }
        SetLastError(0);
 
        MEMORY_BASIC_INFORMATION mbi;
        if (VirtualQuery(addr, &mbi, sizeof(mbi)) == 0) {
#if ZEND_MM_ERROR
            stderr_last_error("VirtualQuery() failed");
#endif
            return;
        }
        addr = mbi.AllocationBase;
 
        if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
#if ZEND_MM_ERROR
            stderr_last_error("VirtualFree() failed");
#endif
        }
    }
#else
    if (munmap(addr, size) != 0) {
#if ZEND_MM_ERROR
        fprintf(stderr, "\nmunmap() failed: [%d] %s\n", errno, strerror(errno));
#endif
    }
#endif
}
 
#ifndef HAVE_MREMAP
static void *zend_mm_mmap_fixed(void *addr, size_t size)
{
#ifdef _WIN32
    void *ptr = VirtualAlloc(addr, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
 
    if (ptr == NULL) {
        if (GetLastError() != ERROR_INVALID_ADDRESS) {
#if ZEND_MM_ERROR
            stderr_last_error("VirtualAlloc() fixed failed");
#endif
        }
        SetLastError(0);
        return NULL;
    }
    ZEND_ASSERT(ptr == addr);
    return ptr;
#else
    int flags = MAP_PRIVATE | MAP_ANON;
#if defined(MAP_EXCL)
    flags |= MAP_FIXED | MAP_EXCL;
#elif defined(MAP_TRYFIXED)
    flags |= MAP_TRYFIXED;
#endif
    /* MAP_FIXED leads to discarding of the old mapping, so it can't be used. */
    void *ptr = mmap(addr, size, PROT_READ | PROT_WRITE, flags /*| MAP_POPULATE | MAP_HUGETLB*/, ZEND_MM_FD, 0);
 
    if (ptr == MAP_FAILED) {
#if ZEND_MM_ERROR && !defined(MAP_EXCL) && !defined(MAP_TRYFIXED)
        fprintf(stderr, "\nmmap() fixed failed: [%d] %s\n", errno, strerror(errno));
#endif
        return NULL;
    } else if (ptr != addr) {
        zend_mm_munmap(ptr, size);
        return NULL;
    }
    return ptr;
#endif
}
#endif
 
static void *zend_mm_mmap(size_t size)
{
#ifdef _WIN32
    void *ptr = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
 
    if (ptr == NULL) {
#if ZEND_MM_ERROR
        stderr_last_error("VirtualAlloc() failed");
#endif
        return NULL;
    }
    return ptr;
#else
    void *ptr;
 
#if defined(MAP_HUGETLB) || defined(VM_FLAGS_SUPERPAGE_SIZE_2MB)
    if (zend_mm_use_huge_pages && size == ZEND_MM_CHUNK_SIZE) {
        int fd = -1;
        int mflags = MAP_PRIVATE | MAP_ANON;
#if defined(MAP_HUGETLB)
        mflags |= MAP_HUGETLB;
#else
        fd = VM_FLAGS_SUPERPAGE_SIZE_2MB;
#endif
        ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, mflags, fd, 0);
        if (ptr != MAP_FAILED) {
            zend_mmap_set_name(ptr, size, "zend_alloc");
            return ptr;
        }
    }
#endif
 
    ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, ZEND_MM_FD, 0);
 
    if (ptr == MAP_FAILED) {
#if ZEND_MM_ERROR
        fprintf(stderr, "\nmmap() failed: [%d] %s\n", errno, strerror(errno));
#endif
        return NULL;
    }
    zend_mmap_set_name(ptr, size, "zend_alloc");
    return ptr;
#endif
}
 
/***********/
/* Bitmask */
/***********/
 
/* number of trailing set (1) bits */
ZEND_ATTRIBUTE_CONST static zend_always_inline int zend_mm_bitset_nts(zend_mm_bitset bitset)
{
#if (defined(__GNUC__) || __has_builtin(__builtin_ctzl)) && SIZEOF_ZEND_LONG == SIZEOF_LONG && defined(PHP_HAVE_BUILTIN_CTZL)
    return __builtin_ctzl(~bitset);
#elif (defined(__GNUC__) || __has_builtin(__builtin_ctzll)) && defined(PHP_HAVE_BUILTIN_CTZLL)
    return __builtin_ctzll(~bitset);
#elif defined(_WIN32)
    unsigned long index;
 
#if defined(_WIN64)
    if (!BitScanForward64(&index, ~bitset)) {
#else
    if (!BitScanForward(&index, ~bitset)) {
#endif
        /* undefined behavior */
        return 32;
    }
 
    return (int)index;
#else
    int n;
 
    if (bitset == (zend_mm_bitset)-1) return ZEND_MM_BITSET_LEN;
 
    n = 0;
#if SIZEOF_ZEND_LONG == 8
    if (sizeof(zend_mm_bitset) == 8) {
        if ((bitset & 0xffffffff) == 0xffffffff) {n += 32; bitset = bitset >> Z_UL(32);}
    }
#endif
    if ((bitset & 0x0000ffff) == 0x0000ffff) {n += 16; bitset = bitset >> 16;}
    if ((bitset & 0x000000ff) == 0x000000ff) {n +=  8; bitset = bitset >>  8;}
    if ((bitset & 0x0000000f) == 0x0000000f) {n +=  4; bitset = bitset >>  4;}
    if ((bitset & 0x00000003) == 0x00000003) {n +=  2; bitset = bitset >>  2;}
    return n + (bitset & 1);
#endif
}
 
static zend_always_inline int zend_mm_bitset_is_set(zend_mm_bitset *bitset, int bit)
{
    return ZEND_BIT_TEST(bitset, bit);
}
 
static zend_always_inline void zend_mm_bitset_set_bit(zend_mm_bitset *bitset, int bit)
{
    bitset[bit / ZEND_MM_BITSET_LEN] |= (Z_UL(1) << (bit & (ZEND_MM_BITSET_LEN-1)));
}
 
static zend_always_inline void zend_mm_bitset_reset_bit(zend_mm_bitset *bitset, int bit)
{
    bitset[bit / ZEND_MM_BITSET_LEN] &= ~(Z_UL(1) << (bit & (ZEND_MM_BITSET_LEN-1)));
}
 
static zend_always_inline void zend_mm_bitset_set_range(zend_mm_bitset *bitset, int start, int len)
{
    if (len == 1) {
        zend_mm_bitset_set_bit(bitset, start);
    } else {
        int pos = start / ZEND_MM_BITSET_LEN;
        int end = (start + len - 1) / ZEND_MM_BITSET_LEN;
        int bit = start & (ZEND_MM_BITSET_LEN - 1);
        zend_mm_bitset tmp;
 
        if (pos != end) {
            /* set bits from "bit" to ZEND_MM_BITSET_LEN-1 */
            tmp = (zend_mm_bitset)-1 << bit;
            bitset[pos++] |= tmp;
            while (pos != end) {
                /* set all bits */
                bitset[pos++] = (zend_mm_bitset)-1;
            }
            end = (start + len - 1) & (ZEND_MM_BITSET_LEN - 1);
            /* set bits from "0" to "end" */
            tmp = (zend_mm_bitset)-1 >> ((ZEND_MM_BITSET_LEN - 1) - end);
            bitset[pos] |= tmp;
        } else {
            end = (start + len - 1) & (ZEND_MM_BITSET_LEN - 1);
            /* set bits from "bit" to "end" */
            tmp = (zend_mm_bitset)-1 << bit;
            tmp &= (zend_mm_bitset)-1 >> ((ZEND_MM_BITSET_LEN - 1) - end);
            bitset[pos] |= tmp;
        }
    }
}
 
static zend_always_inline void zend_mm_bitset_reset_range(zend_mm_bitset *bitset, int start, int len)
{
    if (len == 1) {
        zend_mm_bitset_reset_bit(bitset, start);
    } else {
        int pos = start / ZEND_MM_BITSET_LEN;
        int end = (start + len - 1) / ZEND_MM_BITSET_LEN;
        int bit = start & (ZEND_MM_BITSET_LEN - 1);
        zend_mm_bitset tmp;
 
        if (pos != end) {
            /* reset bits from "bit" to ZEND_MM_BITSET_LEN-1 */
            tmp = ~((Z_UL(1) << bit) - 1);
            bitset[pos++] &= ~tmp;
            while (pos != end) {
                /* set all bits */
                bitset[pos++] = 0;
            }
            end = (start + len - 1) & (ZEND_MM_BITSET_LEN - 1);
            /* reset bits from "0" to "end" */
            tmp = (zend_mm_bitset)-1 >> ((ZEND_MM_BITSET_LEN - 1) - end);
            bitset[pos] &= ~tmp;
        } else {
            end = (start + len - 1) & (ZEND_MM_BITSET_LEN - 1);
            /* reset bits from "bit" to "end" */
            tmp = (zend_mm_bitset)-1 << bit;
            tmp &= (zend_mm_bitset)-1 >> ((ZEND_MM_BITSET_LEN - 1) - end);
            bitset[pos] &= ~tmp;
        }
    }
}
 
static zend_always_inline int zend_mm_bitset_is_free_range(zend_mm_bitset *bitset, int start, int len)
{
    if (len == 1) {
        return !zend_mm_bitset_is_set(bitset, start);
    } else {
        int pos = start / ZEND_MM_BITSET_LEN;
        int end = (start + len - 1) / ZEND_MM_BITSET_LEN;
        int bit = start & (ZEND_MM_BITSET_LEN - 1);
        zend_mm_bitset tmp;
 
        if (pos != end) {
            /* set bits from "bit" to ZEND_MM_BITSET_LEN-1 */
            tmp = (zend_mm_bitset)-1 << bit;
            if ((bitset[pos++] & tmp) != 0) {
                return 0;
            }
            while (pos != end) {
                /* set all bits */
                if (bitset[pos++] != 0) {
                    return 0;
                }
            }
            end = (start + len - 1) & (ZEND_MM_BITSET_LEN - 1);
            /* set bits from "0" to "end" */
            tmp = (zend_mm_bitset)-1 >> ((ZEND_MM_BITSET_LEN - 1) - end);
            return (bitset[pos] & tmp) == 0;
        } else {
            end = (start + len - 1) & (ZEND_MM_BITSET_LEN - 1);
            /* set bits from "bit" to "end" */
            tmp = (zend_mm_bitset)-1 << bit;
            tmp &= (zend_mm_bitset)-1 >> ((ZEND_MM_BITSET_LEN - 1) - end);
            return (bitset[pos] & tmp) == 0;
        }
    }
}
 
/**********/
/* Chunks */
/**********/
 
static zend_always_inline void zend_mm_hugepage(void* ptr, size_t size)
{
#if defined(MADV_HUGEPAGE)
    (void)madvise(ptr, size, MADV_HUGEPAGE);
#elif defined(HAVE_MEMCNTL)
    struct memcntl_mha m = {.mha_cmd = MHA_MAPSIZE_VA, .mha_pagesize = ZEND_MM_CHUNK_SIZE, .mha_flags = 0};
    (void)memcntl(ptr, size, MC_HAT_ADVISE, (char *)&m, 0, 0);
#elif !defined(VM_FLAGS_SUPERPAGE_SIZE_2MB) && !defined(MAP_ALIGNED_SUPER)
    zend_error_noreturn(E_ERROR, "huge_pages: thp unsupported on this platform");
#endif
}
 
static void *zend_mm_chunk_alloc_int(size_t size, size_t alignment)
{
    void *ptr = zend_mm_mmap(size);
 
    if (ptr == NULL) {
        return NULL;
    } else if (ZEND_MM_ALIGNED_OFFSET(ptr, alignment) == 0) {
        if (zend_mm_use_huge_pages) {
            zend_mm_hugepage(ptr, size);
        }
#ifdef __SANITIZE_ADDRESS__
        ASAN_UNPOISON_MEMORY_REGION(ptr, size);
#endif
        return ptr;
    } else {
        size_t offset;
 
        /* chunk has to be aligned */
        zend_mm_munmap(ptr, size);
        ptr = zend_mm_mmap(size + alignment - REAL_PAGE_SIZE);
#ifdef _WIN32
        offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
        if (offset != 0) {
            offset = alignment - offset;
        }
        zend_mm_munmap(ptr, size + alignment - REAL_PAGE_SIZE);
        ptr = zend_mm_mmap_fixed((void*)((char*)ptr + offset), size);
        if (ptr == NULL) { // fix GH-9650, fixed addr range is not free
            ptr = zend_mm_mmap(size + alignment - REAL_PAGE_SIZE);
            if (ptr == NULL) {
                return NULL;
            }
            offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
            if (offset != 0) {
                ptr = (void*)((char*)ptr + alignment - offset);
            }
        }
        return ptr;
#else
        offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
        if (offset != 0) {
            offset = alignment - offset;
            zend_mm_munmap(ptr, offset);
            ptr = (char*)ptr + offset;
            alignment -= offset;
        }
        if (alignment > REAL_PAGE_SIZE) {
            zend_mm_munmap((char*)ptr + size, alignment - REAL_PAGE_SIZE);
        }
        if (zend_mm_use_huge_pages) {
            zend_mm_hugepage(ptr, size);
        }
# ifdef __SANITIZE_ADDRESS__
        ASAN_UNPOISON_MEMORY_REGION(ptr, size);
# endif
#endif
        return ptr;
    }
}
 
static void *zend_mm_chunk_alloc(zend_mm_heap *heap, size_t size, size_t alignment)
{
#if ZEND_MM_STORAGE
    if (UNEXPECTED(heap->storage)) {
        void *ptr = heap->storage->handlers.chunk_alloc(heap->storage, size, alignment);
        ZEND_ASSERT(((uintptr_t)((char*)ptr + (alignment-1)) & (alignment-1)) == (uintptr_t)ptr);
        return ptr;
    }
#endif
    return zend_mm_chunk_alloc_int(size, alignment);
}
 
static void zend_mm_chunk_free(zend_mm_heap *heap, void *addr, size_t size)
{
#if ZEND_MM_STORAGE
    if (UNEXPECTED(heap->storage)) {
        heap->storage->handlers.chunk_free(heap->storage, addr, size);
        return;
    }
#endif
    zend_mm_munmap(addr, size);
}
 
static int zend_mm_chunk_truncate(zend_mm_heap *heap, void *addr, size_t old_size, size_t new_size)
{
#if ZEND_MM_STORAGE
    if (UNEXPECTED(heap->storage)) {
        if (heap->storage->handlers.chunk_truncate) {
            return heap->storage->handlers.chunk_truncate(heap->storage, addr, old_size, new_size);
        } else {
            return 0;
        }
    }
#endif
#ifndef _WIN32
    zend_mm_munmap((char*)addr + new_size, old_size - new_size);
    return 1;
#else
    return 0;
#endif
}
 
static int zend_mm_chunk_extend(zend_mm_heap *heap, void *addr, size_t old_size, size_t new_size)
{
#if ZEND_MM_STORAGE
    if (UNEXPECTED(heap->storage)) {
        if (heap->storage->handlers.chunk_extend) {
            return heap->storage->handlers.chunk_extend(heap->storage, addr, old_size, new_size);
        } else {
            return 0;
        }
    }
#endif
#ifdef HAVE_MREMAP
    /* We don't use MREMAP_MAYMOVE due to alignment requirements. */
    void *ptr = mremap(addr, old_size, new_size, 0);
    if (ptr == MAP_FAILED) {
        return 0;
    }
    /* Sanity check: The mapping shouldn't have moved. */
    ZEND_ASSERT(ptr == addr);
    return 1;
#elif !defined(_WIN32)
    return (zend_mm_mmap_fixed((char*)addr + old_size, new_size - old_size) != NULL);
#else
    return 0;
#endif
}
 
static zend_always_inline void zend_mm_chunk_init(zend_mm_heap *heap, zend_mm_chunk *chunk)
{
    chunk->heap = heap;
    chunk->next = heap->main_chunk;
    chunk->prev = heap->main_chunk->prev;
    chunk->prev->next = chunk;
    chunk->next->prev = chunk;
    /* mark first pages as allocated */
    chunk->free_pages = ZEND_MM_PAGES - ZEND_MM_FIRST_PAGE;
    chunk->free_tail = ZEND_MM_FIRST_PAGE;
    /* the younger chunks have bigger number */
    chunk->num = chunk->prev->num + 1;
    /* mark first pages as allocated */
    chunk->free_map[0] = (1L << ZEND_MM_FIRST_PAGE) - 1;
    chunk->map[0] = ZEND_MM_LRUN(ZEND_MM_FIRST_PAGE);
}
 
/***********************/
/* Huge Runs (forward) */
/***********************/
 
static size_t zend_mm_get_huge_block_size(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
static void *zend_mm_alloc_huge(zend_mm_heap *heap, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
static void zend_mm_free_huge(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
 
#if ZEND_DEBUG
static void zend_mm_change_huge_block_size(zend_mm_heap *heap, void *ptr, size_t size, size_t dbg_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
#else
static void zend_mm_change_huge_block_size(zend_mm_heap *heap, void *ptr, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
#endif
 
/**************/
/* Large Runs */
/**************/
 
#if ZEND_DEBUG
static void *zend_mm_alloc_pages(zend_mm_heap *heap, uint32_t pages_count, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
#else
static void *zend_mm_alloc_pages(zend_mm_heap *heap, uint32_t pages_count ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
#endif
{
    zend_mm_chunk *chunk = heap->main_chunk;
    uint32_t page_num, len;
    int steps = 0;
 
    while (1) {
        if (UNEXPECTED(chunk->free_pages < pages_count)) {
            goto not_found;
#if 0
        } else if (UNEXPECTED(chunk->free_pages + chunk->free_tail == ZEND_MM_PAGES)) {
            if (UNEXPECTED(ZEND_MM_PAGES - chunk->free_tail < pages_count)) {
                goto not_found;
            } else {
                page_num = chunk->free_tail;
                goto found;
            }
        } else if (0) {
            /* First-Fit Search */
            int free_tail = chunk->free_tail;
            zend_mm_bitset *bitset = chunk->free_map;
            zend_mm_bitset tmp = *(bitset++);
            int i = 0;
 
            while (1) {
                /* skip allocated blocks */
                while (tmp == (zend_mm_bitset)-1) {
                    i += ZEND_MM_BITSET_LEN;
                    if (i == ZEND_MM_PAGES) {
                        goto not_found;
                    }
                    tmp = *(bitset++);
                }
                /* find first 0 bit */
                page_num = i + zend_mm_bitset_nts(tmp);
                /* reset bits from 0 to "bit" */
                tmp &= tmp + 1;
                /* skip free blocks */
                while (tmp == 0) {
                    i += ZEND_MM_BITSET_LEN;
                    len = i - page_num;
                    if (len >= pages_count) {
                        goto found;
                    } else if (i >= free_tail) {
                        goto not_found;
                    }
                    tmp = *(bitset++);
                }
                /* find first 1 bit */
                len = (i + zend_ulong_ntz(tmp)) - page_num;
                if (len >= pages_count) {
                    goto found;
                }
                /* set bits from 0 to "bit" */
                tmp |= tmp - 1;
            }
#endif
        } else {
            /* Best-Fit Search */
            int best = -1;
            uint32_t best_len = ZEND_MM_PAGES;
            uint32_t free_tail = chunk->free_tail;
            zend_mm_bitset *bitset = chunk->free_map;
            zend_mm_bitset tmp = *(bitset++);
            uint32_t i = 0;
 
            while (1) {
                /* skip allocated blocks */
                while (tmp == (zend_mm_bitset)-1) {
                    i += ZEND_MM_BITSET_LEN;
                    if (i == ZEND_MM_PAGES) {
                        if (best > 0) {
                            page_num = best;
                            goto found;
                        } else {
                            goto not_found;
                        }
                    }
                    tmp = *(bitset++);
                }
                /* find first 0 bit */
                page_num = i + zend_mm_bitset_nts(tmp);
                /* reset bits from 0 to "bit" */
                tmp &= tmp + 1;
                /* skip free blocks */
                while (tmp == 0) {
                    i += ZEND_MM_BITSET_LEN;
                    if (i >= free_tail || i == ZEND_MM_PAGES) {
                        len = ZEND_MM_PAGES - page_num;
                        if (len >= pages_count && len < best_len) {
                            chunk->free_tail = page_num + pages_count;
                            goto found;
                        } else {
                            /* set accurate value */
                            chunk->free_tail = page_num;
                            if (best > 0) {
                                page_num = best;
                                goto found;
                            } else {
                                goto not_found;
                            }
                        }
                    }
                    tmp = *(bitset++);
                }
                /* find first 1 bit */
                len = i + zend_ulong_ntz(tmp) - page_num;
                if (len >= pages_count) {
                    if (len == pages_count) {
                        goto found;
                    } else if (len < best_len) {
                        best_len = len;
                        best = page_num;
                    }
                }
                /* set bits from 0 to "bit" */
                tmp |= tmp - 1;
            }
        }
 
not_found:
        if (chunk->next == heap->main_chunk) {
get_chunk:
            if (heap->cached_chunks) {
                heap->cached_chunks_count--;
                chunk = heap->cached_chunks;
                heap->cached_chunks = chunk->next;
            } else {
#if ZEND_MM_LIMIT
                if (UNEXPECTED(ZEND_MM_CHUNK_SIZE > heap->limit - heap->real_size)) {
                    if (zend_mm_gc(heap)) {
                        goto get_chunk;
                    } else if (heap->overflow == 0) {
#if ZEND_DEBUG
                        zend_mm_safe_error(heap, "Allowed memory size of %zu bytes exhausted at %s:%d (tried to allocate %zu bytes)", heap->limit, __zend_filename, __zend_lineno, size);
#else
                        zend_mm_safe_error(heap, "Allowed memory size of %zu bytes exhausted (tried to allocate %zu bytes)", heap->limit, ZEND_MM_PAGE_SIZE * pages_count);
#endif
                        return NULL;
                    }
                }
#endif
                chunk = (zend_mm_chunk*)zend_mm_chunk_alloc(heap, ZEND_MM_CHUNK_SIZE, ZEND_MM_CHUNK_SIZE);
                if (UNEXPECTED(chunk == NULL)) {
                    /* insufficient memory */
                    if (zend_mm_gc(heap) &&
                        (chunk = (zend_mm_chunk*)zend_mm_chunk_alloc(heap, ZEND_MM_CHUNK_SIZE, ZEND_MM_CHUNK_SIZE)) != NULL) {
                        /* pass */
                    } else {
#if !ZEND_MM_LIMIT
                        zend_mm_safe_error(heap, "Out of memory");
#elif ZEND_DEBUG
                        zend_mm_safe_error(heap, "Out of memory (allocated %zu bytes) at %s:%d (tried to allocate %zu bytes)", heap->real_size, __zend_filename, __zend_lineno, size);
#else
                        zend_mm_safe_error(heap, "Out of memory (allocated %zu bytes) (tried to allocate %zu bytes)", heap->real_size, ZEND_MM_PAGE_SIZE * pages_count);
#endif
                        return NULL;
                    }
                }
#if ZEND_MM_STAT
                do {
                    size_t size = heap->real_size + ZEND_MM_CHUNK_SIZE;
                    size_t peak = MAX(heap->real_peak, size);
                    heap->real_size = size;
                    heap->real_peak = peak;
                } while (0);
#elif ZEND_MM_LIMIT
                heap->real_size += ZEND_MM_CHUNK_SIZE;
 
#endif
            }
            heap->chunks_count++;
            if (heap->chunks_count > heap->peak_chunks_count) {
                heap->peak_chunks_count = heap->chunks_count;
            }
            zend_mm_chunk_init(heap, chunk);
            page_num = ZEND_MM_FIRST_PAGE;
            len = ZEND_MM_PAGES - ZEND_MM_FIRST_PAGE;
            goto found;
        } else {
            chunk = chunk->next;
            steps++;
        }
    }
 
found:
    if (steps > 2 && pages_count < 8) {
        ZEND_MM_CHECK(chunk->next->prev == chunk, "zend_mm_heap corrupted");
        ZEND_MM_CHECK(chunk->prev->next == chunk, "zend_mm_heap corrupted");
 
        /* move chunk into the head of the linked-list */
        chunk->prev->next = chunk->next;
        chunk->next->prev = chunk->prev;
        chunk->next = heap->main_chunk->next;
        chunk->prev = heap->main_chunk;
        chunk->prev->next = chunk;
        chunk->next->prev = chunk;
    }
    /* mark run as allocated */
    chunk->free_pages -= pages_count;
    zend_mm_bitset_set_range(chunk->free_map, page_num, pages_count);
    chunk->map[page_num] = ZEND_MM_LRUN(pages_count);
    if (page_num == chunk->free_tail) {
        chunk->free_tail = page_num + pages_count;
    }
    return ZEND_MM_PAGE_ADDR(chunk, page_num);
}
 
static zend_always_inline void *zend_mm_alloc_large_ex(zend_mm_heap *heap, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    int pages_count = (int)ZEND_MM_SIZE_TO_NUM(size, ZEND_MM_PAGE_SIZE);
#if ZEND_DEBUG
    void *ptr = zend_mm_alloc_pages(heap, pages_count, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#else
    void *ptr = zend_mm_alloc_pages(heap, pages_count ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#endif
#if ZEND_MM_STAT
    do {
        size_t size = heap->size + pages_count * ZEND_MM_PAGE_SIZE;
        size_t peak = MAX(heap->peak, size);
        heap->size = size;
        heap->peak = peak;
    } while (0);
#endif
    return ptr;
}
 
static zend_never_inline void *zend_mm_alloc_large(zend_mm_heap *heap, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    return zend_mm_alloc_large_ex(heap, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
static zend_always_inline void zend_mm_delete_chunk(zend_mm_heap *heap, zend_mm_chunk *chunk)
{
    ZEND_MM_CHECK(chunk->next->prev == chunk, "zend_mm_heap corrupted");
    ZEND_MM_CHECK(chunk->prev->next == chunk, "zend_mm_heap corrupted");
 
    chunk->next->prev = chunk->prev;
    chunk->prev->next = chunk->next;
    heap->chunks_count--;
    if (heap->chunks_count + heap->cached_chunks_count < heap->avg_chunks_count + 0.1
     || (heap->chunks_count == heap->last_chunks_delete_boundary
      && heap->last_chunks_delete_count >= 4)) {
        /* delay deletion */
        heap->cached_chunks_count++;
        chunk->next = heap->cached_chunks;
        heap->cached_chunks = chunk;
    } else {
#if ZEND_MM_STAT || ZEND_MM_LIMIT
        heap->real_size -= ZEND_MM_CHUNK_SIZE;
#endif
        if (!heap->cached_chunks) {
            if (heap->chunks_count != heap->last_chunks_delete_boundary) {
                heap->last_chunks_delete_boundary = heap->chunks_count;
                heap->last_chunks_delete_count = 0;
            } else {
                heap->last_chunks_delete_count++;
            }
        }
        if (!heap->cached_chunks || chunk->num > heap->cached_chunks->num) {
            zend_mm_chunk_free(heap, chunk, ZEND_MM_CHUNK_SIZE);
        } else {
//TODO: select the best chunk to delete???
            chunk->next = heap->cached_chunks->next;
            zend_mm_chunk_free(heap, heap->cached_chunks, ZEND_MM_CHUNK_SIZE);
            heap->cached_chunks = chunk;
        }
    }
}
 
static zend_always_inline void zend_mm_free_pages_ex(zend_mm_heap *heap, zend_mm_chunk *chunk, uint32_t page_num, uint32_t pages_count, int free_chunk)
{
    chunk->free_pages += pages_count;
    zend_mm_bitset_reset_range(chunk->free_map, page_num, pages_count);
    chunk->map[page_num] = 0;
    if (chunk->free_tail == page_num + pages_count) {
        /* this setting may be not accurate */
        chunk->free_tail = page_num;
    }
    if (free_chunk && chunk != heap->main_chunk && chunk->free_pages == ZEND_MM_PAGES - ZEND_MM_FIRST_PAGE) {
        zend_mm_delete_chunk(heap, chunk);
    }
}
 
static zend_never_inline void zend_mm_free_pages(zend_mm_heap *heap, zend_mm_chunk *chunk, int page_num, int pages_count)
{
    zend_mm_free_pages_ex(heap, chunk, page_num, pages_count, 1);
}
 
static zend_always_inline void zend_mm_free_large(zend_mm_heap *heap, zend_mm_chunk *chunk, int page_num, int pages_count)
{
#if ZEND_MM_STAT
    heap->size -= pages_count * ZEND_MM_PAGE_SIZE;
#endif
    zend_mm_free_pages(heap, chunk, page_num, pages_count);
}
 
/**************/
/* Small Runs */
/**************/
 
/* higher set bit number (0->N/A, 1->1, 2->2, 4->3, 8->4, 127->7, 128->8 etc) */
static zend_always_inline int zend_mm_small_size_to_bit(int size)
{
#if (defined(__GNUC__) || __has_builtin(__builtin_clz))  && defined(PHP_HAVE_BUILTIN_CLZ)
    return (__builtin_clz(size) ^ 0x1f) + 1;
#elif defined(_WIN32)
    unsigned long index;
 
    if (!BitScanReverse(&index, (unsigned long)size)) {
        /* undefined behavior */
        return 64;
    }
 
    return (((31 - (int)index) ^ 0x1f) + 1);
#else
    int n = 16;
    if (size <= 0x00ff) {n -= 8; size = size << 8;}
    if (size <= 0x0fff) {n -= 4; size = size << 4;}
    if (size <= 0x3fff) {n -= 2; size = size << 2;}
    if (size <= 0x7fff) {n -= 1;}
    return n;
#endif
}
 
#ifndef MAX
# define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif
 
#ifndef MIN
# define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
 
static zend_always_inline int zend_mm_small_size_to_bin(size_t size)
{
#if 0
    int n;
                            /*0,  1,  2,  3,  4,  5,  6,  7,  8,  9  10, 11, 12*/
    static const int f1[] = { 3,  3,  3,  3,  3,  3,  3,  4,  5,  6,  7,  8,  9};
    static const int f2[] = { 0,  0,  0,  0,  0,  0,  0,  4,  8, 12, 16, 20, 24};
 
    if (UNEXPECTED(size <= 2)) return 0;
    n = zend_mm_small_size_to_bit(size - 1);
    return ((size-1) >> f1[n]) + f2[n];
#else
    unsigned int t1, t2;
 
    if (size <= 64) {
        /* we need to support size == 0 ... */
        return (size - !!size) >> 3;
    } else {
        t1 = size - 1;
        t2 = zend_mm_small_size_to_bit(t1) - 3;
        t1 = t1 >> t2;
        t2 = t2 - 3;
        t2 = t2 << 2;
        return (int)(t1 + t2);
    }
#endif
}
 
#define ZEND_MM_SMALL_SIZE_TO_BIN(size)  zend_mm_small_size_to_bin(size)
 
#if ZEND_MM_HEAP_PROTECTION
/* We keep track of free slots by organizing them in a linked list, with the
 * first word of every free slot being a pointer to the next one.
 *
 * In order to frustrate corruptions, we check the consistency of these pointers
 * before dereference by comparing them with a shadow.
 *
 * The shadow is a copy of the pointer, stored at the end of the slot. It is
 * XOR'ed with a random key, and converted to big-endian so that smaller
 * corruptions affect the most significant bytes, which has a high chance of
 * resulting in an invalid address instead of pointing to an adjacent slot.
 */
 
#define ZEND_MM_FREE_SLOT_PTR_SHADOW(free_slot, bin_num) \
    *((zend_mm_free_slot**)((char*)(free_slot) + bin_data_size[(bin_num)] - sizeof(zend_mm_free_slot*)))
 
static zend_always_inline zend_mm_free_slot* zend_mm_encode_free_slot(const zend_mm_heap *heap, const zend_mm_free_slot *slot)
{
#ifdef WORDS_BIGENDIAN
    return (zend_mm_free_slot*)(((uintptr_t)slot) ^ heap->shadow_key);
#else
    return (zend_mm_free_slot*)(BSWAPPTR((uintptr_t)slot) ^ heap->shadow_key);
#endif
}
 
static zend_always_inline zend_mm_free_slot* zend_mm_decode_free_slot(zend_mm_heap *heap, zend_mm_free_slot *slot)
{
#ifdef WORDS_BIGENDIAN
    return (zend_mm_free_slot*)((uintptr_t)slot ^ heap->shadow_key);
#else
    return (zend_mm_free_slot*)(BSWAPPTR((uintptr_t)slot ^ heap->shadow_key));
#endif
}
 
static zend_always_inline void zend_mm_set_next_free_slot(zend_mm_heap *heap, uint32_t bin_num, zend_mm_free_slot *slot, zend_mm_free_slot *next)
{
    ZEND_ASSERT(bin_data_size[bin_num] >= ZEND_MM_MIN_USEABLE_BIN_SIZE);
 
    slot->next_free_slot = next;
    ZEND_MM_FREE_SLOT_PTR_SHADOW(slot, bin_num) = zend_mm_encode_free_slot(heap, next);
}
 
static zend_always_inline zend_mm_free_slot *zend_mm_get_next_free_slot(zend_mm_heap *heap, uint32_t bin_num, zend_mm_free_slot* slot)
{
    zend_mm_free_slot *next = slot->next_free_slot;
    if (EXPECTED(next != NULL)) {
        zend_mm_free_slot *shadow = ZEND_MM_FREE_SLOT_PTR_SHADOW(slot, bin_num);
        if (UNEXPECTED(next != zend_mm_decode_free_slot(heap, shadow))) {
            zend_mm_panic("zend_mm_heap corrupted");
        }
    }
    return (zend_mm_free_slot*)next;
}
 
#else /* ZEND_MM_HEAP_PROTECTION */
# define zend_mm_set_next_free_slot(heap, bin_num, slot, next) do { \
        (slot)->next_free_slot = (next);                            \
    } while (0)
# define zend_mm_get_next_free_slot(heap, bin_num, slot) (slot)->next_free_slot
#endif /* ZEND_MM_HEAP_PROTECTION */
 
static zend_never_inline void *zend_mm_alloc_small_slow(zend_mm_heap *heap, uint32_t bin_num ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    zend_mm_chunk *chunk;
    int page_num;
    zend_mm_bin *bin;
    zend_mm_free_slot *p, *end;
 
#if ZEND_DEBUG
    bin = (zend_mm_bin*)zend_mm_alloc_pages(heap, bin_pages[bin_num], bin_data_size[bin_num] ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#else
    bin = (zend_mm_bin*)zend_mm_alloc_pages(heap, bin_pages[bin_num] ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#endif
    if (UNEXPECTED(bin == NULL)) {
        /* insufficient memory */
        return NULL;
    }
 
    chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(bin, ZEND_MM_CHUNK_SIZE);
    page_num = ZEND_MM_ALIGNED_OFFSET(bin, ZEND_MM_CHUNK_SIZE) / ZEND_MM_PAGE_SIZE;
    chunk->map[page_num] = ZEND_MM_SRUN(bin_num);
    if (bin_pages[bin_num] > 1) {
        uint32_t i = 1;
 
        do {
            chunk->map[page_num+i] = ZEND_MM_NRUN(bin_num, i);
            i++;
        } while (i < bin_pages[bin_num]);
    }
 
    /* create a linked list of elements from 1 to last */
    end = (zend_mm_free_slot*)((char*)bin + (bin_data_size[bin_num] * (bin_elements[bin_num] - 1)));
    heap->free_slot[bin_num] = p = (zend_mm_free_slot*)((char*)bin + bin_data_size[bin_num]);
    do {
        zend_mm_set_next_free_slot(heap, bin_num, p, (zend_mm_free_slot*)((char*)p + bin_data_size[bin_num]));
#if ZEND_DEBUG
        do {
            zend_mm_debug_info *dbg = (zend_mm_debug_info*)((char*)p + bin_data_size[bin_num] - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
            dbg->size = 0;
        } while (0);
#endif
        p = (zend_mm_free_slot*)((char*)p + bin_data_size[bin_num]);
    } while (p != end);
 
    /* terminate list using NULL */
    p->next_free_slot = NULL;
#if ZEND_DEBUG
        do {
            zend_mm_debug_info *dbg = (zend_mm_debug_info*)((char*)p + bin_data_size[bin_num] - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
            dbg->size = 0;
        } while (0);
#endif
 
    /* return first element */
    return bin;
}
 
static zend_always_inline void *zend_mm_alloc_small(zend_mm_heap *heap, int bin_num ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    ZEND_ASSERT(bin_data_size[bin_num] >= ZEND_MM_MIN_USEABLE_BIN_SIZE);
 
#if ZEND_MM_STAT
    do {
        size_t size = heap->size + bin_data_size[bin_num];
        size_t peak = MAX(heap->peak, size);
        heap->size = size;
        heap->peak = peak;
    } while (0);
#endif
 
    if (EXPECTED(heap->free_slot[bin_num] != NULL)) {
        zend_mm_free_slot *p = heap->free_slot[bin_num];
        heap->free_slot[bin_num] = zend_mm_get_next_free_slot(heap, bin_num, p);
        return p;
    } else {
        return zend_mm_alloc_small_slow(heap, bin_num ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    }
}
 
static zend_always_inline void zend_mm_free_small(zend_mm_heap *heap, void *ptr, int bin_num)
{
    ZEND_ASSERT(bin_data_size[bin_num] >= ZEND_MM_MIN_USEABLE_BIN_SIZE);
 
    zend_mm_free_slot *p;
 
#if ZEND_MM_STAT
    heap->size -= bin_data_size[bin_num];
#endif
 
#if ZEND_DEBUG
    do {
        zend_mm_debug_info *dbg = (zend_mm_debug_info*)((char*)ptr + bin_data_size[bin_num] - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
        dbg->size = 0;
    } while (0);
#endif
 
    p = (zend_mm_free_slot*)ptr;
    zend_mm_set_next_free_slot(heap, bin_num, p, heap->free_slot[bin_num]);
    heap->free_slot[bin_num] = p;
}
 
/********/
/* Heap */
/********/
 
#if ZEND_DEBUG
static zend_always_inline zend_mm_debug_info *zend_mm_get_debug_info(zend_mm_heap *heap, void *ptr)
{
    size_t page_offset = ZEND_MM_ALIGNED_OFFSET(ptr, ZEND_MM_CHUNK_SIZE);
    zend_mm_chunk *chunk;
    int page_num;
    zend_mm_page_info info;
 
    ZEND_MM_CHECK(page_offset != 0, "zend_mm_heap corrupted");
    chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(ptr, ZEND_MM_CHUNK_SIZE);
    page_num = (int)(page_offset / ZEND_MM_PAGE_SIZE);
    info = chunk->map[page_num];
    ZEND_MM_CHECK(chunk->heap == heap, "zend_mm_heap corrupted");
    if (EXPECTED(info & ZEND_MM_IS_SRUN)) {
        int bin_num = ZEND_MM_SRUN_BIN_NUM(info);
        return (zend_mm_debug_info*)((char*)ptr + bin_data_size[bin_num] - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
    } else /* if (info & ZEND_MM_IS_LRUN) */ {
        int pages_count = ZEND_MM_LRUN_PAGES(info);
 
        return (zend_mm_debug_info*)((char*)ptr + ZEND_MM_PAGE_SIZE * pages_count - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
    }
}
#endif
 
static zend_always_inline void *zend_mm_alloc_heap(zend_mm_heap *heap, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    void *ptr;
#if ZEND_MM_HEAP_PROTECTION
    if (size < ZEND_MM_MIN_USEABLE_BIN_SIZE) {
        size = ZEND_MM_MIN_USEABLE_BIN_SIZE;
    }
#endif /* ZEND_MM_HEAP_PROTECTION */
#if ZEND_DEBUG
    size_t real_size = size;
    zend_mm_debug_info *dbg;
 
    /* special handling for zero-size allocation */
    size = MAX(size, 1);
    size = ZEND_MM_ALIGNED_SIZE(size) + ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info));
    if (UNEXPECTED(size < real_size)) {
        zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%zu + %zu)", ZEND_MM_ALIGNED_SIZE(real_size), ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
        return NULL;
    }
#endif
    if (EXPECTED(size <= ZEND_MM_MAX_SMALL_SIZE)) {
        ptr = zend_mm_alloc_small(heap, ZEND_MM_SMALL_SIZE_TO_BIN(size) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#if ZEND_DEBUG
        dbg = zend_mm_get_debug_info(heap, ptr);
        dbg->size = real_size;
        dbg->filename = __zend_filename;
        dbg->orig_filename = __zend_orig_filename;
        dbg->lineno = __zend_lineno;
        dbg->orig_lineno = __zend_orig_lineno;
#endif
        return ptr;
    } else if (EXPECTED(size <= ZEND_MM_MAX_LARGE_SIZE)) {
        ptr = zend_mm_alloc_large(heap, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#if ZEND_DEBUG
        dbg = zend_mm_get_debug_info(heap, ptr);
        dbg->size = real_size;
        dbg->filename = __zend_filename;
        dbg->orig_filename = __zend_orig_filename;
        dbg->lineno = __zend_lineno;
        dbg->orig_lineno = __zend_orig_lineno;
#endif
        return ptr;
    } else {
#if ZEND_DEBUG
        size = real_size;
#endif
        return zend_mm_alloc_huge(heap, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    }
}
 
static zend_always_inline void zend_mm_free_heap(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    size_t page_offset = ZEND_MM_ALIGNED_OFFSET(ptr, ZEND_MM_CHUNK_SIZE);
 
    if (UNEXPECTED(page_offset == 0)) {
        if (ptr != NULL) {
            zend_mm_free_huge(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
        }
    } else {
        zend_mm_chunk *chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(ptr, ZEND_MM_CHUNK_SIZE);
        int page_num = (int)(page_offset / ZEND_MM_PAGE_SIZE);
        zend_mm_page_info info = chunk->map[page_num];
 
        ZEND_MM_CHECK(chunk->heap == heap, "zend_mm_heap corrupted");
        if (EXPECTED(info & ZEND_MM_IS_SRUN)) {
            zend_mm_free_small(heap, ptr, ZEND_MM_SRUN_BIN_NUM(info));
        } else /* if (info & ZEND_MM_IS_LRUN) */ {
            int pages_count = ZEND_MM_LRUN_PAGES(info);
 
            ZEND_MM_CHECK(ZEND_MM_ALIGNED_OFFSET(page_offset, ZEND_MM_PAGE_SIZE) == 0, "zend_mm_heap corrupted");
            zend_mm_free_large(heap, chunk, page_num, pages_count);
        }
    }
}
 
static size_t zend_mm_size(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    size_t page_offset = ZEND_MM_ALIGNED_OFFSET(ptr, ZEND_MM_CHUNK_SIZE);
 
    if (UNEXPECTED(page_offset == 0)) {
        return zend_mm_get_huge_block_size(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    } else {
        zend_mm_chunk *chunk;
#if 0 && ZEND_DEBUG
        zend_mm_debug_info *dbg = zend_mm_get_debug_info(heap, ptr);
        return dbg->size;
#else
        int page_num;
        zend_mm_page_info info;
 
        chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(ptr, ZEND_MM_CHUNK_SIZE);
        page_num = (int)(page_offset / ZEND_MM_PAGE_SIZE);
        info = chunk->map[page_num];
        ZEND_MM_CHECK(chunk->heap == heap, "zend_mm_heap corrupted");
        if (EXPECTED(info & ZEND_MM_IS_SRUN)) {
            return bin_data_size[ZEND_MM_SRUN_BIN_NUM(info)];
        } else /* if (info & ZEND_MM_IS_LARGE_RUN) */ {
            return ZEND_MM_LRUN_PAGES(info) * ZEND_MM_PAGE_SIZE;
        }
#endif
    }
}
 
static zend_never_inline void *zend_mm_realloc_slow(zend_mm_heap *heap, void *ptr, size_t size, size_t copy_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    void *ret;
 
#if ZEND_MM_STAT
    do {
        size_t orig_peak = heap->peak;
#endif
        ret = zend_mm_alloc_heap(heap, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
        memcpy(ret, ptr, copy_size);
        zend_mm_free_heap(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#if ZEND_MM_STAT
        heap->peak = MAX(orig_peak, heap->size);
    } while (0);
#endif
    return ret;
}
 
static zend_never_inline void *zend_mm_realloc_huge(zend_mm_heap *heap, void *ptr, size_t size, size_t copy_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    size_t old_size;
    size_t new_size;
#if ZEND_DEBUG
    size_t real_size;
#endif
 
    old_size = zend_mm_get_huge_block_size(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#if ZEND_DEBUG
    real_size = size;
    size = ZEND_MM_ALIGNED_SIZE(size) + ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info));
#endif
    if (size > ZEND_MM_MAX_LARGE_SIZE) {
#if ZEND_DEBUG
        size = real_size;
#endif
#ifdef ZEND_WIN32
        /* On Windows we don't have ability to extend huge blocks in-place.
         * We allocate them with 2MB size granularity, to avoid many
         * reallocations when they are extended by small pieces
         */
        new_size = ZEND_MM_ALIGNED_SIZE_EX(size, MAX(REAL_PAGE_SIZE, ZEND_MM_CHUNK_SIZE));
#else
        new_size = ZEND_MM_ALIGNED_SIZE_EX(size, REAL_PAGE_SIZE);
#endif
        if (new_size == old_size) {
#if ZEND_DEBUG
            zend_mm_change_huge_block_size(heap, ptr, new_size, real_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#else
            zend_mm_change_huge_block_size(heap, ptr, new_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#endif
            return ptr;
        } else if (new_size < old_size) {
            /* unmup tail */
            if (zend_mm_chunk_truncate(heap, ptr, old_size, new_size)) {
#if ZEND_MM_STAT || ZEND_MM_LIMIT
                heap->real_size -= old_size - new_size;
#endif
#if ZEND_MM_STAT
                heap->size -= old_size - new_size;
#endif
#if ZEND_DEBUG
                zend_mm_change_huge_block_size(heap, ptr, new_size, real_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#else
                zend_mm_change_huge_block_size(heap, ptr, new_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#endif
                return ptr;
            }
        } else /* if (new_size > old_size) */ {
#if ZEND_MM_LIMIT
            if (UNEXPECTED(new_size - old_size > heap->limit - heap->real_size)) {
                if (zend_mm_gc(heap) && new_size - old_size <= heap->limit - heap->real_size) {
                    /* pass */
                } else if (heap->overflow == 0) {
#if ZEND_DEBUG
                    zend_mm_safe_error(heap, "Allowed memory size of %zu bytes exhausted at %s:%d (tried to allocate %zu bytes)", heap->limit, __zend_filename, __zend_lineno, size);
#else
                    zend_mm_safe_error(heap, "Allowed memory size of %zu bytes exhausted (tried to allocate %zu bytes)", heap->limit, size);
#endif
                    return NULL;
                }
            }
#endif
            /* try to map tail right after this block */
            if (zend_mm_chunk_extend(heap, ptr, old_size, new_size)) {
#if ZEND_MM_STAT || ZEND_MM_LIMIT
                heap->real_size += new_size - old_size;
#endif
#if ZEND_MM_STAT
                heap->real_peak = MAX(heap->real_peak, heap->real_size);
                heap->size += new_size - old_size;
                heap->peak = MAX(heap->peak, heap->size);
#endif
#if ZEND_DEBUG
                zend_mm_change_huge_block_size(heap, ptr, new_size, real_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#else
                zend_mm_change_huge_block_size(heap, ptr, new_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#endif
                return ptr;
            }
        }
    }
 
    return zend_mm_realloc_slow(heap, ptr, size, MIN(old_size, copy_size) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
static zend_always_inline void *zend_mm_realloc_heap(zend_mm_heap *heap, void *ptr, size_t size, bool use_copy_size, size_t copy_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    size_t page_offset;
    size_t old_size;
    size_t new_size;
    void *ret;
#if ZEND_DEBUG
    zend_mm_debug_info *dbg;
#endif
 
    page_offset = ZEND_MM_ALIGNED_OFFSET(ptr, ZEND_MM_CHUNK_SIZE);
    if (UNEXPECTED(page_offset == 0)) {
        if (EXPECTED(ptr == NULL)) {
            return _zend_mm_alloc(heap, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
        } else {
            return zend_mm_realloc_huge(heap, ptr, size, copy_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
        }
    } else {
        zend_mm_chunk *chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(ptr, ZEND_MM_CHUNK_SIZE);
        int page_num = (int)(page_offset / ZEND_MM_PAGE_SIZE);
        zend_mm_page_info info = chunk->map[page_num];
#if ZEND_MM_HEAP_PROTECTION
        if (size < ZEND_MM_MIN_USEABLE_BIN_SIZE) {
            size = ZEND_MM_MIN_USEABLE_BIN_SIZE;
        }
#endif /* ZEND_MM_HEAP_PROTECTION */
#if ZEND_DEBUG
        size_t real_size = size;
 
        size = ZEND_MM_ALIGNED_SIZE(size) + ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info));
#endif
 
        ZEND_MM_CHECK(chunk->heap == heap, "zend_mm_heap corrupted");
        if (info & ZEND_MM_IS_SRUN) {
            int old_bin_num = ZEND_MM_SRUN_BIN_NUM(info);
 
            do {
                old_size = bin_data_size[old_bin_num];
 
                /* Check if requested size fits into current bin */
                if (size <= old_size) {
                    /* Check if truncation is necessary */
                    if (old_bin_num > 0 && size < bin_data_size[old_bin_num - 1]) {
                        /* truncation */
                        ret = zend_mm_alloc_small(heap, ZEND_MM_SMALL_SIZE_TO_BIN(size) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
                        copy_size = use_copy_size ? MIN(size, copy_size) : size;
                        memcpy(ret, ptr, copy_size);
                        zend_mm_free_small(heap, ptr, old_bin_num);
                    } else {
                        /* reallocation in-place */
                        ret = ptr;
                    }
                } else if (size <= ZEND_MM_MAX_SMALL_SIZE) {
                    /* small extension */
 
#if ZEND_MM_STAT
                    do {
                        size_t orig_peak = heap->peak;
#endif
                        ret = zend_mm_alloc_small(heap, ZEND_MM_SMALL_SIZE_TO_BIN(size) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
                        copy_size = use_copy_size ? MIN(old_size, copy_size) : old_size;
                        memcpy(ret, ptr, copy_size);
                        zend_mm_free_small(heap, ptr, old_bin_num);
#if ZEND_MM_STAT
                        heap->peak = MAX(orig_peak, heap->size);
                    } while (0);
#endif
                } else {
                    /* slow reallocation */
                    break;
                }
 
#if ZEND_DEBUG
                dbg = zend_mm_get_debug_info(heap, ret);
                dbg->size = real_size;
                dbg->filename = __zend_filename;
                dbg->orig_filename = __zend_orig_filename;
                dbg->lineno = __zend_lineno;
                dbg->orig_lineno = __zend_orig_lineno;
#endif
                return ret;
            }  while (0);
 
        } else /* if (info & ZEND_MM_IS_LARGE_RUN) */ {
            ZEND_MM_CHECK(ZEND_MM_ALIGNED_OFFSET(page_offset, ZEND_MM_PAGE_SIZE) == 0, "zend_mm_heap corrupted");
            old_size = ZEND_MM_LRUN_PAGES(info) * ZEND_MM_PAGE_SIZE;
            if (size > ZEND_MM_MAX_SMALL_SIZE && size <= ZEND_MM_MAX_LARGE_SIZE) {
                new_size = ZEND_MM_ALIGNED_SIZE_EX(size, ZEND_MM_PAGE_SIZE);
                if (new_size == old_size) {
#if ZEND_DEBUG
                    dbg = zend_mm_get_debug_info(heap, ptr);
                    dbg->size = real_size;
                    dbg->filename = __zend_filename;
                    dbg->orig_filename = __zend_orig_filename;
                    dbg->lineno = __zend_lineno;
                    dbg->orig_lineno = __zend_orig_lineno;
#endif
                    return ptr;
                } else if (new_size < old_size) {
                    /* free tail pages */
                    int new_pages_count = (int)(new_size / ZEND_MM_PAGE_SIZE);
                    int rest_pages_count = (int)((old_size - new_size) / ZEND_MM_PAGE_SIZE);
 
#if ZEND_MM_STAT
                    heap->size -= rest_pages_count * ZEND_MM_PAGE_SIZE;
#endif
                    chunk->map[page_num] = ZEND_MM_LRUN(new_pages_count);
                    chunk->free_pages += rest_pages_count;
                    zend_mm_bitset_reset_range(chunk->free_map, page_num + new_pages_count, rest_pages_count);
#if ZEND_DEBUG
                    dbg = zend_mm_get_debug_info(heap, ptr);
                    dbg->size = real_size;
                    dbg->filename = __zend_filename;
                    dbg->orig_filename = __zend_orig_filename;
                    dbg->lineno = __zend_lineno;
                    dbg->orig_lineno = __zend_orig_lineno;
#endif
                    return ptr;
                } else /* if (new_size > old_size) */ {
                    int new_pages_count = (int)(new_size / ZEND_MM_PAGE_SIZE);
                    int old_pages_count = (int)(old_size / ZEND_MM_PAGE_SIZE);
 
                    /* try to allocate tail pages after this block */
                    if (page_num + new_pages_count <= ZEND_MM_PAGES &&
                        zend_mm_bitset_is_free_range(chunk->free_map, page_num + old_pages_count, new_pages_count - old_pages_count)) {
#if ZEND_MM_STAT
                        do {
                            size_t size = heap->size + (new_size - old_size);
                            size_t peak = MAX(heap->peak, size);
                            heap->size = size;
                            heap->peak = peak;
                        } while (0);
#endif
                        chunk->free_pages -= new_pages_count - old_pages_count;
                        zend_mm_bitset_set_range(chunk->free_map, page_num + old_pages_count, new_pages_count - old_pages_count);
                        chunk->map[page_num] = ZEND_MM_LRUN(new_pages_count);
#if ZEND_DEBUG
                        dbg = zend_mm_get_debug_info(heap, ptr);
                        dbg->size = real_size;
                        dbg->filename = __zend_filename;
                        dbg->orig_filename = __zend_orig_filename;
                        dbg->lineno = __zend_lineno;
                        dbg->orig_lineno = __zend_orig_lineno;
#endif
                        return ptr;
                    }
                }
            }
        }
#if ZEND_DEBUG
        size = real_size;
#endif
    }
 
    copy_size = MIN(old_size, copy_size);
    return zend_mm_realloc_slow(heap, ptr, size, copy_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
/*********************/
/* Huge Runs (again) */
/*********************/
 
#if ZEND_DEBUG
static void zend_mm_add_huge_block(zend_mm_heap *heap, void *ptr, size_t size, size_t dbg_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
#else
static void zend_mm_add_huge_block(zend_mm_heap *heap, void *ptr, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
#endif
{
    zend_mm_huge_list *list = (zend_mm_huge_list*)zend_mm_alloc_heap(heap, sizeof(zend_mm_huge_list) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    list->ptr = ptr;
    list->size = size;
    list->next = heap->huge_list;
#if ZEND_DEBUG
    list->dbg.size = dbg_size;
    list->dbg.filename = __zend_filename;
    list->dbg.orig_filename = __zend_orig_filename;
    list->dbg.lineno = __zend_lineno;
    list->dbg.orig_lineno = __zend_orig_lineno;
#endif
    heap->huge_list = list;
}
 
static size_t zend_mm_del_huge_block(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    zend_mm_huge_list *prev = NULL;
    zend_mm_huge_list *list = heap->huge_list;
    while (list != NULL) {
        if (list->ptr == ptr) {
            size_t size;
 
            if (prev) {
                prev->next = list->next;
            } else {
                heap->huge_list = list->next;
            }
            size = list->size;
            zend_mm_free_heap(heap, list ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
            return size;
        }
        prev = list;
        list = list->next;
    }
    ZEND_MM_CHECK(0, "zend_mm_heap corrupted");
    return 0;
}
 
static size_t zend_mm_get_huge_block_size(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    zend_mm_huge_list *list = heap->huge_list;
    while (list != NULL) {
        if (list->ptr == ptr) {
            return list->size;
        }
        list = list->next;
    }
    ZEND_MM_CHECK(0, "zend_mm_heap corrupted");
    return 0;
}
 
#if ZEND_DEBUG
static void zend_mm_change_huge_block_size(zend_mm_heap *heap, void *ptr, size_t size, size_t dbg_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
#else
static void zend_mm_change_huge_block_size(zend_mm_heap *heap, void *ptr, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
#endif
{
    zend_mm_huge_list *list = heap->huge_list;
    while (list != NULL) {
        if (list->ptr == ptr) {
            list->size = size;
#if ZEND_DEBUG
            list->dbg.size = dbg_size;
            list->dbg.filename = __zend_filename;
            list->dbg.orig_filename = __zend_orig_filename;
            list->dbg.lineno = __zend_lineno;
            list->dbg.orig_lineno = __zend_orig_lineno;
#endif
            return;
        }
        list = list->next;
    }
}
 
static void *zend_mm_alloc_huge(zend_mm_heap *heap, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
#ifdef ZEND_WIN32
    /* On Windows we don't have ability to extend huge blocks in-place.
     * We allocate them with 2MB size granularity, to avoid many
     * reallocations when they are extended by small pieces
     */
    size_t alignment = MAX(REAL_PAGE_SIZE, ZEND_MM_CHUNK_SIZE);
#else
    size_t alignment = REAL_PAGE_SIZE;
#endif
    size_t new_size = ZEND_MM_ALIGNED_SIZE_EX(size, alignment);
    void *ptr;
 
    if (UNEXPECTED(new_size < size)) {
        zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%zu + %zu)", size, alignment);
    }
 
#if ZEND_MM_LIMIT
    if (UNEXPECTED(new_size > heap->limit - heap->real_size)) {
        if (zend_mm_gc(heap) && new_size <= heap->limit - heap->real_size) {
            /* pass */
        } else if (heap->overflow == 0) {
#if ZEND_DEBUG
            zend_mm_safe_error(heap, "Allowed memory size of %zu bytes exhausted at %s:%d (tried to allocate %zu bytes)", heap->limit, __zend_filename, __zend_lineno, size);
#else
            zend_mm_safe_error(heap, "Allowed memory size of %zu bytes exhausted (tried to allocate %zu bytes)", heap->limit, size);
#endif
            return NULL;
        }
    }
#endif
    ptr = zend_mm_chunk_alloc(heap, new_size, ZEND_MM_CHUNK_SIZE);
    if (UNEXPECTED(ptr == NULL)) {
        /* insufficient memory */
        if (zend_mm_gc(heap) &&
            (ptr = zend_mm_chunk_alloc(heap, new_size, ZEND_MM_CHUNK_SIZE)) != NULL) {
            /* pass */
        } else {
#if !ZEND_MM_LIMIT
            zend_mm_safe_error(heap, "Out of memory");
#elif ZEND_DEBUG
            zend_mm_safe_error(heap, "Out of memory (allocated %zu bytes) at %s:%d (tried to allocate %zu bytes)", heap->real_size, __zend_filename, __zend_lineno, size);
#else
            zend_mm_safe_error(heap, "Out of memory (allocated %zu bytes) (tried to allocate %zu bytes)", heap->real_size, size);
#endif
            return NULL;
        }
    }
#if ZEND_DEBUG
    zend_mm_add_huge_block(heap, ptr, new_size, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#else
    zend_mm_add_huge_block(heap, ptr, new_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
#endif
#if ZEND_MM_STAT
    do {
        size_t size = heap->real_size + new_size;
        size_t peak = MAX(heap->real_peak, size);
        heap->real_size = size;
        heap->real_peak = peak;
    } while (0);
    do {
        size_t size = heap->size + new_size;
        size_t peak = MAX(heap->peak, size);
        heap->size = size;
        heap->peak = peak;
    } while (0);
#elif ZEND_MM_LIMIT
    heap->real_size += new_size;
#endif
    return ptr;
}
 
static void zend_mm_free_huge(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    size_t size;
 
    ZEND_MM_CHECK(ZEND_MM_ALIGNED_OFFSET(ptr, ZEND_MM_CHUNK_SIZE) == 0, "zend_mm_heap corrupted");
    size = zend_mm_del_huge_block(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    zend_mm_chunk_free(heap, ptr, size);
#if ZEND_MM_STAT || ZEND_MM_LIMIT
    heap->real_size -= size;
#endif
#if ZEND_MM_STAT
    heap->size -= size;
#endif
}
 
/******************/
/* Initialization */
/******************/
 
static void zend_mm_refresh_key(zend_mm_heap *heap)
{
    zend_random_bytes_insecure(&heap->rand_state, &heap->shadow_key, sizeof(heap->shadow_key));
}
 
static void zend_mm_init_key(zend_mm_heap *heap)
{
    memset(&heap->rand_state, 0, sizeof(heap->rand_state));
    zend_mm_refresh_key(heap);
}
 
static zend_mm_heap *zend_mm_init(void)
{
    zend_mm_chunk *chunk = (zend_mm_chunk*)zend_mm_chunk_alloc_int(ZEND_MM_CHUNK_SIZE, ZEND_MM_CHUNK_SIZE);
    zend_mm_heap *heap;
 
    if (UNEXPECTED(chunk == NULL)) {
#if ZEND_MM_ERROR
        fprintf(stderr, "Can't initialize heap\n");
#endif
        return NULL;
    }
    heap = &chunk->heap_slot;
    chunk->heap = heap;
    chunk->next = chunk;
    chunk->prev = chunk;
    chunk->free_pages = ZEND_MM_PAGES - ZEND_MM_FIRST_PAGE;
    chunk->free_tail = ZEND_MM_FIRST_PAGE;
    chunk->num = 0;
    chunk->free_map[0] = (Z_L(1) << ZEND_MM_FIRST_PAGE) - 1;
    chunk->map[0] = ZEND_MM_LRUN(ZEND_MM_FIRST_PAGE);
    heap->main_chunk = chunk;
    heap->cached_chunks = NULL;
    heap->chunks_count = 1;
    heap->peak_chunks_count = 1;
    heap->cached_chunks_count = 0;
    heap->avg_chunks_count = 1.0;
    heap->last_chunks_delete_boundary = 0;
    heap->last_chunks_delete_count = 0;
#if ZEND_MM_STAT || ZEND_MM_LIMIT
    heap->real_size = ZEND_MM_CHUNK_SIZE;
#endif
#if ZEND_MM_STAT
    heap->real_peak = ZEND_MM_CHUNK_SIZE;
    heap->size = 0;
    heap->peak = 0;
#endif
    zend_mm_init_key(heap);
#if ZEND_MM_LIMIT
    heap->limit = (size_t)Z_L(-1) >> 1;
    heap->overflow = 0;
#endif
#if ZEND_MM_CUSTOM
    heap->use_custom_heap = ZEND_MM_CUSTOM_HEAP_NONE;
#endif
#if ZEND_MM_STORAGE
    heap->storage = NULL;
#endif
    heap->huge_list = NULL;
    heap->pid = getpid();
    return heap;
}
 
ZEND_API size_t zend_mm_gc(zend_mm_heap *heap)
{
    zend_mm_free_slot *p, *q;
    zend_mm_chunk *chunk;
    size_t page_offset;
    int page_num;
    zend_mm_page_info info;
    uint32_t i, free_counter;
    bool has_free_pages;
    size_t collected = 0;
 
#if ZEND_MM_CUSTOM
    if (heap->use_custom_heap) {
        size_t (*gc)(void) = heap->custom_heap._gc;
        if (gc) {
            return gc();
        }
        return 0;
    }
#endif
 
    for (i = 0; i < ZEND_MM_BINS; i++) {
        has_free_pages = false;
        p = heap->free_slot[i];
        while (p != NULL) {
            chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(p, ZEND_MM_CHUNK_SIZE);
            ZEND_MM_CHECK(chunk->heap == heap, "zend_mm_heap corrupted");
            page_offset = ZEND_MM_ALIGNED_OFFSET(p, ZEND_MM_CHUNK_SIZE);
            ZEND_ASSERT(page_offset != 0);
            page_num = (int)(page_offset / ZEND_MM_PAGE_SIZE);
            info = chunk->map[page_num];
            ZEND_ASSERT(info & ZEND_MM_IS_SRUN);
            if (info & ZEND_MM_IS_LRUN) {
                page_num -= ZEND_MM_NRUN_OFFSET(info);
                info = chunk->map[page_num];
                ZEND_ASSERT(info & ZEND_MM_IS_SRUN);
                ZEND_ASSERT(!(info & ZEND_MM_IS_LRUN));
            }
            ZEND_ASSERT(ZEND_MM_SRUN_BIN_NUM(info) == i);
            free_counter = ZEND_MM_SRUN_FREE_COUNTER(info) + 1;
            if (free_counter == bin_elements[i]) {
                has_free_pages = true;
            }
            chunk->map[page_num] = ZEND_MM_SRUN_EX(i, free_counter);
            p = zend_mm_get_next_free_slot(heap, i, p);
        }
 
        if (!has_free_pages) {
            continue;
        }
 
        q = (zend_mm_free_slot*)&heap->free_slot[i];
        p = q->next_free_slot;
        while (p != NULL) {
            chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(p, ZEND_MM_CHUNK_SIZE);
            ZEND_MM_CHECK(chunk->heap == heap, "zend_mm_heap corrupted");
            page_offset = ZEND_MM_ALIGNED_OFFSET(p, ZEND_MM_CHUNK_SIZE);
            ZEND_ASSERT(page_offset != 0);
            page_num = (int)(page_offset / ZEND_MM_PAGE_SIZE);
            info = chunk->map[page_num];
            ZEND_ASSERT(info & ZEND_MM_IS_SRUN);
            if (info & ZEND_MM_IS_LRUN) {
                page_num -= ZEND_MM_NRUN_OFFSET(info);
                info = chunk->map[page_num];
                ZEND_ASSERT(info & ZEND_MM_IS_SRUN);
                ZEND_ASSERT(!(info & ZEND_MM_IS_LRUN));
            }
            ZEND_ASSERT(ZEND_MM_SRUN_BIN_NUM(info) == i);
            if (ZEND_MM_SRUN_FREE_COUNTER(info) == bin_elements[i]) {
                /* remove from cache */
                p = zend_mm_get_next_free_slot(heap, i, p);
                if (q == (zend_mm_free_slot*)&heap->free_slot[i]) {
                    q->next_free_slot = p;
                } else {
                    zend_mm_set_next_free_slot(heap, i, q, p);
                }
            } else {
                q = p;
                if (q == (zend_mm_free_slot*)&heap->free_slot[i]) {
                    p = q->next_free_slot;
                } else {
                    p = zend_mm_get_next_free_slot(heap, i, q);
                }
            }
        }
    }
 
    chunk = heap->main_chunk;
    do {
        i = ZEND_MM_FIRST_PAGE;
        while (i < chunk->free_tail) {
            if (zend_mm_bitset_is_set(chunk->free_map, i)) {
                info = chunk->map[i];
                if (info & ZEND_MM_IS_SRUN) {
                    int bin_num = ZEND_MM_SRUN_BIN_NUM(info);
                    int pages_count = bin_pages[bin_num];
 
                    if (ZEND_MM_SRUN_FREE_COUNTER(info) == bin_elements[bin_num]) {
                        /* all elements are free */
                        zend_mm_free_pages_ex(heap, chunk, i, pages_count, 0);
                        collected += pages_count;
                    } else {
                        /* reset counter */
                        chunk->map[i] = ZEND_MM_SRUN(bin_num);
                    }
                    i += bin_pages[bin_num];
                } else /* if (info & ZEND_MM_IS_LRUN) */ {
                    i += ZEND_MM_LRUN_PAGES(info);
                }
            } else {
                i++;
            }
        }
        if (chunk->free_pages == ZEND_MM_PAGES - ZEND_MM_FIRST_PAGE) {
            zend_mm_chunk *next_chunk = chunk->next;
 
            zend_mm_delete_chunk(heap, chunk);
            chunk = next_chunk;
        } else {
            chunk = chunk->next;
        }
    } while (chunk != heap->main_chunk);
 
    return collected * ZEND_MM_PAGE_SIZE;
}
 
#if ZEND_DEBUG
/******************/
/* Leak detection */
/******************/
 
static zend_long zend_mm_find_leaks_small(zend_mm_chunk *p, uint32_t i, uint32_t j, zend_leak_info *leak)
{
    bool empty = true;
    zend_long count = 0;
    int bin_num = ZEND_MM_SRUN_BIN_NUM(p->map[i]);
    zend_mm_debug_info *dbg = (zend_mm_debug_info*)((char*)p + ZEND_MM_PAGE_SIZE * i + bin_data_size[bin_num] * (j + 1) - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
 
    while (j < bin_elements[bin_num]) {
        if (dbg->size != 0) {
            if (dbg->filename == leak->filename && dbg->lineno == leak->lineno) {
                count++;
                dbg->size = 0;
                dbg->filename = NULL;
                dbg->lineno = 0;
            } else {
                empty = false;
            }
        }
        j++;
        dbg = (zend_mm_debug_info*)((char*)dbg + bin_data_size[bin_num]);
    }
    if (empty) {
        zend_mm_bitset_reset_range(p->free_map, i, bin_pages[bin_num]);
    }
    return count;
}
 
static zend_long zend_mm_find_leaks(zend_mm_heap *heap, zend_mm_chunk *p, uint32_t i, zend_leak_info *leak)
{
    zend_long count = 0;
 
    do {
        while (i < p->free_tail) {
            if (zend_mm_bitset_is_set(p->free_map, i)) {
                if (p->map[i] & ZEND_MM_IS_SRUN) {
                    int bin_num = ZEND_MM_SRUN_BIN_NUM(p->map[i]);
                    count += zend_mm_find_leaks_small(p, i, 0, leak);
                    i += bin_pages[bin_num];
                } else /* if (p->map[i] & ZEND_MM_IS_LRUN) */ {
                    int pages_count = ZEND_MM_LRUN_PAGES(p->map[i]);
                    zend_mm_debug_info *dbg = (zend_mm_debug_info*)((char*)p + ZEND_MM_PAGE_SIZE * (i + pages_count) - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
 
                    if (dbg->filename == leak->filename && dbg->lineno == leak->lineno) {
                        count++;
                    }
                    zend_mm_bitset_reset_range(p->free_map, i, pages_count);
                    i += pages_count;
                }
            } else {
                i++;
            }
        }
        p = p->next;
        i = ZEND_MM_FIRST_PAGE;
    } while (p != heap->main_chunk);
    return count;
}
 
static zend_long zend_mm_find_leaks_huge(zend_mm_heap *heap, zend_mm_huge_list *list)
{
    zend_long count = 0;
    zend_mm_huge_list *prev = list;
    zend_mm_huge_list *p = list->next;
 
    while (p) {
        if (p->dbg.filename == list->dbg.filename && p->dbg.lineno == list->dbg.lineno) {
            prev->next = p->next;
            zend_mm_chunk_free(heap, p->ptr, p->size);
            zend_mm_free_heap(heap, p, NULL, 0, NULL, 0);
            count++;
        } else {
            prev = p;
        }
        p = prev->next;
    }
 
    return count;
}
 
static void zend_mm_check_leaks(zend_mm_heap *heap)
{
    zend_mm_huge_list *list;
    zend_mm_chunk *p;
    zend_leak_info leak;
    zend_long repeated = 0;
    uint32_t total = 0;
    uint32_t i, j;
 
    /* find leaked huge blocks and free them */
    list = heap->huge_list;
    while (list) {
        zend_mm_huge_list *q = list;
 
        leak.addr = list->ptr;
        leak.size = list->dbg.size;
        leak.filename = list->dbg.filename;
        leak.orig_filename = list->dbg.orig_filename;
        leak.lineno = list->dbg.lineno;
        leak.orig_lineno = list->dbg.orig_lineno;
 
        zend_message_dispatcher(ZMSG_LOG_SCRIPT_NAME, NULL);
        zend_message_dispatcher(ZMSG_MEMORY_LEAK_DETECTED, &leak);
        repeated = zend_mm_find_leaks_huge(heap, list);
        total += 1 + repeated;
        if (repeated) {
            zend_message_dispatcher(ZMSG_MEMORY_LEAK_REPEATED, (void *)(uintptr_t)repeated);
        }
 
        heap->huge_list = list = list->next;
        zend_mm_chunk_free(heap, q->ptr, q->size);
        zend_mm_free_heap(heap, q, NULL, 0, NULL, 0);
    }
 
    /* for each chunk */
    p = heap->main_chunk;
    do {
        i = ZEND_MM_FIRST_PAGE;
        while (i < p->free_tail) {
            if (zend_mm_bitset_is_set(p->free_map, i)) {
                if (p->map[i] & ZEND_MM_IS_SRUN) {
                    int bin_num = ZEND_MM_SRUN_BIN_NUM(p->map[i]);
                    zend_mm_debug_info *dbg = (zend_mm_debug_info*)((char*)p + ZEND_MM_PAGE_SIZE * i + bin_data_size[bin_num] - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
 
                    j = 0;
                    while (j < bin_elements[bin_num]) {
                        if (dbg->size != 0) {
                            leak.addr = (zend_mm_debug_info*)((char*)p + ZEND_MM_PAGE_SIZE * i + bin_data_size[bin_num] * j);
                            leak.size = dbg->size;
                            leak.filename = dbg->filename;
                            leak.orig_filename = dbg->orig_filename;
                            leak.lineno = dbg->lineno;
                            leak.orig_lineno = dbg->orig_lineno;
 
                            zend_message_dispatcher(ZMSG_LOG_SCRIPT_NAME, NULL);
                            zend_message_dispatcher(ZMSG_MEMORY_LEAK_DETECTED, &leak);
 
                            dbg->size = 0;
                            dbg->filename = NULL;
                            dbg->lineno = 0;
 
                            repeated = zend_mm_find_leaks_small(p, i, j + 1, &leak) +
                                       zend_mm_find_leaks(heap, p, i + bin_pages[bin_num], &leak);
                            total += 1 + repeated;
                            if (repeated) {
                                zend_message_dispatcher(ZMSG_MEMORY_LEAK_REPEATED, (void *)(uintptr_t)repeated);
                            }
                        }
                        dbg = (zend_mm_debug_info*)((char*)dbg + bin_data_size[bin_num]);
                        j++;
                    }
                    i += bin_pages[bin_num];
                } else /* if (p->map[i] & ZEND_MM_IS_LRUN) */ {
                    int pages_count = ZEND_MM_LRUN_PAGES(p->map[i]);
                    zend_mm_debug_info *dbg = (zend_mm_debug_info*)((char*)p + ZEND_MM_PAGE_SIZE * (i + pages_count) - ZEND_MM_ALIGNED_SIZE(sizeof(zend_mm_debug_info)));
 
                    leak.addr = (void*)((char*)p + ZEND_MM_PAGE_SIZE * i);
                    leak.size = dbg->size;
                    leak.filename = dbg->filename;
                    leak.orig_filename = dbg->orig_filename;
                    leak.lineno = dbg->lineno;
                    leak.orig_lineno = dbg->orig_lineno;
 
                    zend_message_dispatcher(ZMSG_LOG_SCRIPT_NAME, NULL);
                    zend_message_dispatcher(ZMSG_MEMORY_LEAK_DETECTED, &leak);
 
                    zend_mm_bitset_reset_range(p->free_map, i, pages_count);
 
                    repeated = zend_mm_find_leaks(heap, p, i + pages_count, &leak);
                    total += 1 + repeated;
                    if (repeated) {
                        zend_message_dispatcher(ZMSG_MEMORY_LEAK_REPEATED, (void *)(uintptr_t)repeated);
                    }
                    i += pages_count;
                }
            } else {
                i++;
            }
        }
        p = p->next;
    } while (p != heap->main_chunk);
    if (total) {
        zend_message_dispatcher(ZMSG_MEMORY_LEAKS_GRAND_TOTAL, &total);
    }
}
#endif
 
#if ZEND_MM_CUSTOM
static void *tracked_malloc(size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
static void tracked_free_all(zend_mm_heap *heap);
#endif
 
ZEND_API void zend_mm_shutdown(zend_mm_heap *heap, bool full, bool silent)
{
    zend_mm_chunk *p;
    zend_mm_huge_list *list;
 
#if ZEND_MM_CUSTOM
    if (heap->use_custom_heap) {
        if (heap->custom_heap._malloc == tracked_malloc) {
            if (silent) {
                tracked_free_all(heap);
            }
            zend_hash_clean(heap->tracked_allocs);
            if (full) {
                zend_hash_destroy(heap->tracked_allocs);
                free(heap->tracked_allocs);
                /* Make sure the heap free below does not use tracked_free(). */
                heap->custom_heap._free = __zend_free;
            }
            heap->size = 0;
        }
 
        void (*shutdown)(bool, bool) = heap->custom_heap._shutdown;
 
        if (full) {
            heap->custom_heap._free(heap ZEND_FILE_LINE_CC ZEND_FILE_LINE_EMPTY_CC);
        }
 
        if (shutdown) {
            shutdown(full, silent);
        }
 
        return;
    }
#endif
 
#if ZEND_DEBUG
    if (!silent) {
        char *tmp = getenv("ZEND_ALLOC_PRINT_LEAKS");
        if (!tmp || ZEND_ATOL(tmp)) {
            zend_mm_check_leaks(heap);
        }
    }
#endif
 
    /* free huge blocks */
    list = heap->huge_list;
    heap->huge_list = NULL;
    while (list) {
        zend_mm_huge_list *q = list;
        list = list->next;
        zend_mm_chunk_free(heap, q->ptr, q->size);
    }
 
    /* move all chunks except of the first one into the cache */
    p = heap->main_chunk->next;
    while (p != heap->main_chunk) {
        zend_mm_chunk *q = p->next;
        p->next = heap->cached_chunks;
        heap->cached_chunks = p;
        p = q;
        heap->chunks_count--;
        heap->cached_chunks_count++;
    }
 
    if (full) {
        /* free all cached chunks */
        while (heap->cached_chunks) {
            p = heap->cached_chunks;
            heap->cached_chunks = p->next;
            zend_mm_chunk_free(heap, p, ZEND_MM_CHUNK_SIZE);
        }
        /* free the first chunk */
        zend_mm_chunk_free(heap, heap->main_chunk, ZEND_MM_CHUNK_SIZE);
    } else {
        /* free some cached chunks to keep average count */
        heap->avg_chunks_count = (heap->avg_chunks_count + (double)heap->peak_chunks_count) / 2.0;
        while ((double)heap->cached_chunks_count + 0.9 > heap->avg_chunks_count &&
               heap->cached_chunks) {
            p = heap->cached_chunks;
            heap->cached_chunks = p->next;
            zend_mm_chunk_free(heap, p, ZEND_MM_CHUNK_SIZE);
            heap->cached_chunks_count--;
        }
        /* clear cached chunks */
        p = heap->cached_chunks;
        while (p != NULL) {
            zend_mm_chunk *q = p->next;
            memset(p, 0, sizeof(zend_mm_chunk));
            p->next = q;
            p = q;
        }
 
        /* reinitialize the first chunk and heap */
        p = heap->main_chunk;
        p->heap = &p->heap_slot;
        p->next = p;
        p->prev = p;
        p->free_pages = ZEND_MM_PAGES - ZEND_MM_FIRST_PAGE;
        p->free_tail = ZEND_MM_FIRST_PAGE;
        p->num = 0;
 
#if ZEND_MM_STAT
        heap->size = heap->peak = 0;
#endif
        memset(heap->free_slot, 0, sizeof(heap->free_slot));
#if ZEND_MM_STAT || ZEND_MM_LIMIT
        heap->real_size = (heap->cached_chunks_count + 1) * ZEND_MM_CHUNK_SIZE;
#endif
#if ZEND_MM_STAT
        heap->real_peak = (heap->cached_chunks_count + 1) * ZEND_MM_CHUNK_SIZE;
#endif
        heap->chunks_count = 1;
        heap->peak_chunks_count = 1;
        heap->last_chunks_delete_boundary = 0;
        heap->last_chunks_delete_count = 0;
 
        memset(p->free_map, 0, sizeof(p->free_map) + sizeof(p->map));
        p->free_map[0] = (1L << ZEND_MM_FIRST_PAGE) - 1;
        p->map[0] = ZEND_MM_LRUN(ZEND_MM_FIRST_PAGE);
 
        pid_t pid = getpid();
        if (heap->pid != pid) {
            zend_mm_init_key(heap);
            heap->pid = pid;
        } else {
            zend_mm_refresh_key(heap);
        }
    }
}
 
/**************/
/* PUBLIC API */
/**************/
 
ZEND_API void* ZEND_FASTCALL _zend_mm_alloc(zend_mm_heap *heap, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    return zend_mm_alloc_heap(heap, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void ZEND_FASTCALL _zend_mm_free(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    zend_mm_free_heap(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
void* ZEND_FASTCALL _zend_mm_realloc(zend_mm_heap *heap, void *ptr, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    return zend_mm_realloc_heap(heap, ptr, size, 0, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
void* ZEND_FASTCALL _zend_mm_realloc2(zend_mm_heap *heap, void *ptr, size_t size, size_t copy_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    return zend_mm_realloc_heap(heap, ptr, size, 1, copy_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API size_t ZEND_FASTCALL _zend_mm_block_size(zend_mm_heap *heap, void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
#if ZEND_MM_CUSTOM
    if (UNEXPECTED(heap->use_custom_heap)) {
        if (heap->custom_heap._malloc == tracked_malloc) {
            zend_ulong h = ((uintptr_t) ptr) >> ZEND_MM_ALIGNMENT_LOG2;
            zval *size_zv = zend_hash_index_find(heap->tracked_allocs, h);
            if  (size_zv) {
                return Z_LVAL_P(size_zv);
            }
        }
        return 0;
    }
#endif
    return zend_mm_size(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
/**********************/
/* Allocation Manager */
/**********************/
 
typedef struct _zend_alloc_globals {
    zend_mm_heap *mm_heap;
} zend_alloc_globals;
 
#ifdef ZTS
static int alloc_globals_id;
static size_t alloc_globals_offset;
# define AG(v) ZEND_TSRMG_FAST(alloc_globals_offset, zend_alloc_globals *, v)
#else
# define AG(v) (alloc_globals.v)
static zend_alloc_globals alloc_globals;
#endif
 
ZEND_API bool is_zend_mm(void)
{
#if ZEND_MM_CUSTOM
    return !AG(mm_heap)->use_custom_heap;
#else
    return 1;
#endif
}
 
ZEND_API bool is_zend_ptr(const void *ptr)
{
#if ZEND_MM_CUSTOM
    if (AG(mm_heap)->use_custom_heap) {
        if (AG(mm_heap)->custom_heap._malloc == tracked_malloc) {
            zend_ulong h = ((uintptr_t) ptr) >> ZEND_MM_ALIGNMENT_LOG2;
            zval *size_zv = zend_hash_index_find(AG(mm_heap)->tracked_allocs, h);
            if  (size_zv) {
                return 1;
            }
        }
        return 0;
    }
#endif
 
    if (AG(mm_heap)->main_chunk) {
        zend_mm_chunk *chunk = AG(mm_heap)->main_chunk;
 
        do {
            if (ptr >= (void*)chunk
             && ptr < (void*)((char*)chunk + ZEND_MM_CHUNK_SIZE)) {
                return 1;
            }
            chunk = chunk->next;
        } while (chunk != AG(mm_heap)->main_chunk);
    }
 
    zend_mm_huge_list *block = AG(mm_heap)->huge_list;
    while (block) {
        if (ptr >= block->ptr
                && ptr < (void*)((char*)block->ptr + block->size)) {
            return 1;
        }
        block = block->next;
    }
 
    return 0;
}
 
#if !ZEND_DEBUG && defined(HAVE_BUILTIN_CONSTANT_P)
#undef _emalloc
 
#if ZEND_MM_CUSTOM
# define ZEND_MM_CUSTOM_ALLOCATOR(size) do { \
        if (UNEXPECTED(AG(mm_heap)->use_custom_heap)) { \
            return AG(mm_heap)->custom_heap._malloc(size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC); \
        } \
    } while (0)
# define ZEND_MM_CUSTOM_DEALLOCATOR(ptr) do { \
        if (UNEXPECTED(AG(mm_heap)->use_custom_heap)) { \
            AG(mm_heap)->custom_heap._free(ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC); \
            return; \
        } \
    } while (0)
#else
# define ZEND_MM_CUSTOM_ALLOCATOR(size)
# define ZEND_MM_CUSTOM_DEALLOCATOR(ptr)
#endif
 
# define _ZEND_BIN_ALLOCATOR(_num, _size, _elements, _pages, _min_size, y) \
    ZEND_API void* ZEND_FASTCALL _emalloc_ ## _size(void) { \
        ZEND_MM_CUSTOM_ALLOCATOR(_size); \
        if (_size < _min_size) { \
            return _emalloc_ ## _min_size(); \
        } \
        return zend_mm_alloc_small(AG(mm_heap), _num ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC); \
    }
 
ZEND_MM_BINS_INFO(_ZEND_BIN_ALLOCATOR, ZEND_MM_MIN_USEABLE_BIN_SIZE, y)
 
ZEND_API void* ZEND_FASTCALL _emalloc_large(size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    ZEND_MM_CUSTOM_ALLOCATOR(size);
    return zend_mm_alloc_large_ex(AG(mm_heap), size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void* ZEND_FASTCALL _emalloc_huge(size_t size)
{
    ZEND_MM_CUSTOM_ALLOCATOR(size);
    return zend_mm_alloc_huge(AG(mm_heap), size);
}
 
#if ZEND_DEBUG
# define _ZEND_BIN_FREE(_num, _size, _elements, _pages, _min_size, y) \
    ZEND_API void ZEND_FASTCALL _efree_ ## _size(void *ptr) { \
        ZEND_MM_CUSTOM_DEALLOCATOR(ptr); \
        if (_size < _min_size) { \
            _efree_ ## _min_size(ptr); \
            return; \
        } \
        { \
            size_t page_offset = ZEND_MM_ALIGNED_OFFSET(ptr, ZEND_MM_CHUNK_SIZE); \
            zend_mm_chunk *chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(ptr, ZEND_MM_CHUNK_SIZE); \
            int page_num = page_offset / ZEND_MM_PAGE_SIZE; \
            ZEND_MM_CHECK(chunk->heap == AG(mm_heap), "zend_mm_heap corrupted"); \
            ZEND_ASSERT(chunk->map[page_num] & ZEND_MM_IS_SRUN); \
            ZEND_ASSERT(ZEND_MM_SRUN_BIN_NUM(chunk->map[page_num]) == _num); \
            zend_mm_free_small(AG(mm_heap), ptr, _num); \
        } \
    }
#else
# define _ZEND_BIN_FREE(_num, _size, _elements, _pages, _min_size, y) \
    ZEND_API void ZEND_FASTCALL _efree_ ## _size(void *ptr) { \
        ZEND_MM_CUSTOM_DEALLOCATOR(ptr); \
        if (_size < _min_size) { \
            _efree_ ## _min_size(ptr); \
            return; \
        } \
        { \
            zend_mm_chunk *chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(ptr, ZEND_MM_CHUNK_SIZE); \
            ZEND_MM_CHECK(chunk->heap == AG(mm_heap), "zend_mm_heap corrupted"); \
            zend_mm_free_small(AG(mm_heap), ptr, _num); \
        } \
    }
#endif
 
ZEND_MM_BINS_INFO(_ZEND_BIN_FREE, ZEND_MM_MIN_USEABLE_BIN_SIZE, y)
 
ZEND_API void ZEND_FASTCALL _efree_large(void *ptr, size_t size)
{
    ZEND_MM_CUSTOM_DEALLOCATOR(ptr);
    {
        size_t page_offset = ZEND_MM_ALIGNED_OFFSET(ptr, ZEND_MM_CHUNK_SIZE);
        zend_mm_chunk *chunk = (zend_mm_chunk*)ZEND_MM_ALIGNED_BASE(ptr, ZEND_MM_CHUNK_SIZE);
        int page_num = page_offset / ZEND_MM_PAGE_SIZE;
        uint32_t pages_count = ZEND_MM_ALIGNED_SIZE_EX(size, ZEND_MM_PAGE_SIZE) / ZEND_MM_PAGE_SIZE;
 
        ZEND_MM_CHECK(chunk->heap == AG(mm_heap) && ZEND_MM_ALIGNED_OFFSET(page_offset, ZEND_MM_PAGE_SIZE) == 0, "zend_mm_heap corrupted");
        ZEND_ASSERT(chunk->map[page_num] & ZEND_MM_IS_LRUN);
        ZEND_ASSERT(ZEND_MM_LRUN_PAGES(chunk->map[page_num]) == pages_count);
        zend_mm_free_large(AG(mm_heap), chunk, page_num, pages_count);
    }
}
 
ZEND_API void ZEND_FASTCALL _efree_huge(void *ptr, size_t size)
{
 
    ZEND_MM_CUSTOM_DEALLOCATOR(ptr);
    zend_mm_free_huge(AG(mm_heap), ptr);
}
#endif
 
ZEND_API void* ZEND_FASTCALL _emalloc(size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
#if ZEND_MM_CUSTOM
    if (UNEXPECTED(AG(mm_heap)->use_custom_heap)) {
        return AG(mm_heap)->custom_heap._malloc(size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC); \
    }
#endif
    return zend_mm_alloc_heap(AG(mm_heap), size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void ZEND_FASTCALL _efree(void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
#if ZEND_MM_CUSTOM
    if (UNEXPECTED(AG(mm_heap)->use_custom_heap)) {
        AG(mm_heap)->custom_heap._free(ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
        return;
    }
#endif
    zend_mm_free_heap(AG(mm_heap), ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void* ZEND_FASTCALL _erealloc(void *ptr, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
#if ZEND_MM_CUSTOM
    if (UNEXPECTED(AG(mm_heap)->use_custom_heap)) {
        return AG(mm_heap)->custom_heap._realloc(ptr, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    }
#endif
    return zend_mm_realloc_heap(AG(mm_heap), ptr, size, 0, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void* ZEND_FASTCALL _erealloc2(void *ptr, size_t size, size_t copy_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
#if ZEND_MM_CUSTOM
    if (UNEXPECTED(AG(mm_heap)->use_custom_heap)) {
        return AG(mm_heap)->custom_heap._realloc(ptr, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    }
#endif
    return zend_mm_realloc_heap(AG(mm_heap), ptr, size, 1, copy_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API size_t ZEND_FASTCALL _zend_mem_block_size(void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    return _zend_mm_block_size(AG(mm_heap), ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void* ZEND_FASTCALL _safe_emalloc(size_t nmemb, size_t size, size_t offset ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    return _emalloc(zend_safe_address_guarded(nmemb, size, offset) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void* ZEND_FASTCALL _safe_malloc(size_t nmemb, size_t size, size_t offset)
{
    return pemalloc(zend_safe_address_guarded(nmemb, size, offset), 1);
}
 
ZEND_API void* ZEND_FASTCALL _safe_erealloc(void *ptr, size_t nmemb, size_t size, size_t offset ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    return _erealloc(ptr, zend_safe_address_guarded(nmemb, size, offset) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
 
ZEND_API void* ZEND_FASTCALL _safe_realloc(void *ptr, size_t nmemb, size_t size, size_t offset)
{
    return perealloc(ptr, zend_safe_address_guarded(nmemb, size, offset), 1);
}
 
ZEND_API void* ZEND_FASTCALL _ecalloc(size_t nmemb, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    void *p;
 
    size = zend_safe_address_guarded(nmemb, size, 0);
    p = _emalloc(size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    memset(p, 0, size);
    return p;
}
 
ZEND_API char* ZEND_FASTCALL _estrdup(const char *s ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    size_t length;
    char *p;
 
    length = strlen(s);
    if (UNEXPECTED(length + 1 == 0)) {
        zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (1 * %zu + 1)", length);
    }
    p = (char *) _emalloc(length + 1 ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    memcpy(p, s, length+1);
    return p;
}
 
ZEND_API char* ZEND_FASTCALL _estrndup(const char *s, size_t length ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    char *p;
 
    if (UNEXPECTED(length + 1 == 0)) {
        zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (1 * %zu + 1)", length);
    }
    p = (char *) _emalloc(length + 1 ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    memcpy(p, s, length);
    p[length] = 0;
    return p;
}
 
static ZEND_COLD ZEND_NORETURN void zend_out_of_memory(void);
 
ZEND_API char* ZEND_FASTCALL zend_strndup(const char *s, size_t length)
{
    char *p;
 
    if (UNEXPECTED(length + 1 == 0)) {
        zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (1 * %zu + 1)", length);
    }
    p = (char *) malloc(length + 1);
    if (UNEXPECTED(p == NULL)) {
        zend_out_of_memory();
    }
    if (EXPECTED(length)) {
        memcpy(p, s, length);
    }
    p[length] = 0;
    return p;
}
 
ZEND_API zend_result zend_set_memory_limit(size_t memory_limit)
{
#if ZEND_MM_LIMIT
    zend_mm_heap *heap = AG(mm_heap);
 
    if (UNEXPECTED(memory_limit < heap->real_size)) {
        if (memory_limit >= heap->real_size - heap->cached_chunks_count * ZEND_MM_CHUNK_SIZE) {
            /* free some cached chunks to fit into new memory limit */
            do {
                zend_mm_chunk *p = heap->cached_chunks;
                heap->cached_chunks = p->next;
                zend_mm_chunk_free(heap, p, ZEND_MM_CHUNK_SIZE);
                heap->cached_chunks_count--;
                heap->real_size -= ZEND_MM_CHUNK_SIZE;
            } while (memory_limit < heap->real_size);
            return SUCCESS;
        }
        return FAILURE;
    }
    AG(mm_heap)->limit = memory_limit;
#endif
    return SUCCESS;
}
 
ZEND_API bool zend_alloc_in_memory_limit_error_reporting(void)
{
#if ZEND_MM_LIMIT
    return AG(mm_heap)->overflow;
#else
    return false;
#endif
}
 
ZEND_API size_t zend_memory_usage(bool real_usage)
{
#if ZEND_MM_STAT
    if (real_usage) {
        return AG(mm_heap)->real_size;
    } else {
        size_t usage = AG(mm_heap)->size;
        return usage;
    }
#endif
    return 0;
}
 
ZEND_API size_t zend_memory_peak_usage(bool real_usage)
{
#if ZEND_MM_STAT
    if (real_usage) {
        return AG(mm_heap)->real_peak;
    } else {
        return AG(mm_heap)->peak;
    }
#endif
    return 0;
}
 
ZEND_API void zend_memory_reset_peak_usage(void)
{
#if ZEND_MM_STAT
    AG(mm_heap)->real_peak = AG(mm_heap)->real_size;
    AG(mm_heap)->peak = AG(mm_heap)->size;
#endif
}
 
ZEND_API void shutdown_memory_manager(bool silent, bool full_shutdown)
{
    zend_mm_shutdown(AG(mm_heap), full_shutdown, silent);
}
 
static ZEND_COLD ZEND_NORETURN void zend_out_of_memory(void)
{
    fprintf(stderr, "Out of memory\n");
    exit(1);
}
 
#if ZEND_MM_CUSTOM
static zend_always_inline void tracked_add(zend_mm_heap *heap, void *ptr, size_t size) {
    zval size_zv;
    zend_ulong h = ((uintptr_t) ptr) >> ZEND_MM_ALIGNMENT_LOG2;
    ZEND_ASSERT((void *) (uintptr_t) (h << ZEND_MM_ALIGNMENT_LOG2) == ptr);
    ZVAL_LONG(&size_zv, size);
    zend_hash_index_add_new(heap->tracked_allocs, h, &size_zv);
}
 
static zend_always_inline zval *tracked_get_size_zv(zend_mm_heap *heap, void *ptr) {
    zend_ulong h = ((uintptr_t) ptr) >> ZEND_MM_ALIGNMENT_LOG2;
    zval *size_zv = zend_hash_index_find(heap->tracked_allocs, h);
    ZEND_ASSERT(size_zv && "Trying to free pointer not allocated through ZendMM");
    return size_zv;
}
 
static zend_always_inline void tracked_check_limit(zend_mm_heap *heap, size_t add_size) {
    if (add_size > heap->limit - heap->size && !heap->overflow) {
#if ZEND_DEBUG
        zend_mm_safe_error(heap,
            "Allowed memory size of %zu bytes exhausted at %s:%d (tried to allocate %zu bytes)",
            heap->limit, "file", 0, add_size);
#else
        zend_mm_safe_error(heap,
            "Allowed memory size of %zu bytes exhausted (tried to allocate %zu bytes)",
            heap->limit, add_size);
#endif
    }
}
 
static void *tracked_malloc(size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    zend_mm_heap *heap = AG(mm_heap);
    tracked_check_limit(heap, size);
 
    void *ptr = malloc(size);
    if (!ptr) {
        zend_out_of_memory();
    }
 
    tracked_add(heap, ptr, size);
    heap->size += size;
    return ptr;
}
 
static void tracked_free(void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC) {
    if (!ptr) {
        return;
    }
 
    zend_mm_heap *heap = AG(mm_heap);
    zval *size_zv = tracked_get_size_zv(heap, ptr);
    heap->size -= Z_LVAL_P(size_zv);
    zend_hash_del_bucket(heap->tracked_allocs, (Bucket *) size_zv);
    free(ptr);
}
 
static void *tracked_realloc(void *ptr, size_t new_size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC) {
    zend_mm_heap *heap = AG(mm_heap);
    zval *old_size_zv = NULL;
    size_t old_size = 0;
    if (ptr) {
        old_size_zv = tracked_get_size_zv(heap, ptr);
        old_size = Z_LVAL_P(old_size_zv);
    }
 
    if (new_size > old_size) {
        tracked_check_limit(heap, new_size - old_size);
    }
 
    /* Delete information about old allocation only after checking the memory limit. */
    if (old_size_zv) {
        zend_hash_del_bucket(heap->tracked_allocs, (Bucket *) old_size_zv);
    }
 
    ptr = __zend_realloc(ptr, new_size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    tracked_add(heap, ptr, new_size);
    heap->size += new_size - old_size;
    return ptr;
}
 
static void tracked_free_all(zend_mm_heap *heap) {
    HashTable *tracked_allocs = heap->tracked_allocs;
    zend_ulong h;
    ZEND_HASH_FOREACH_NUM_KEY(tracked_allocs, h) {
        void *ptr = (void *) (uintptr_t) (h << ZEND_MM_ALIGNMENT_LOG2);
        free(ptr);
    } ZEND_HASH_FOREACH_END();
}
#endif
 
static void alloc_globals_ctor(zend_alloc_globals *alloc_globals)
{
    char *tmp;
 
#if ZEND_MM_CUSTOM
    tmp = getenv("USE_ZEND_ALLOC");
    if (tmp && !ZEND_ATOL(tmp)) {
        bool tracked = (tmp = getenv("USE_TRACKED_ALLOC")) && ZEND_ATOL(tmp);
        zend_mm_heap *mm_heap = alloc_globals->mm_heap = malloc(sizeof(zend_mm_heap));
        memset(mm_heap, 0, sizeof(zend_mm_heap));
        mm_heap->use_custom_heap = ZEND_MM_CUSTOM_HEAP_STD;
        mm_heap->limit = (size_t)Z_L(-1) >> 1;
        mm_heap->overflow = 0;
 
        if (!tracked) {
            /* Use system allocator. */
            mm_heap->custom_heap._malloc = __zend_malloc;
            mm_heap->custom_heap._free = __zend_free;
            mm_heap->custom_heap._realloc = __zend_realloc;
        } else {
            /* Use system allocator and track allocations for auto-free. */
            mm_heap->custom_heap._malloc = tracked_malloc;
            mm_heap->custom_heap._free = tracked_free;
            mm_heap->custom_heap._realloc = tracked_realloc;
            mm_heap->tracked_allocs = malloc(sizeof(HashTable));
            zend_hash_init(mm_heap->tracked_allocs, 1024, NULL, NULL, 1);
        }
        return;
    }
#endif
 
    tmp = getenv("USE_ZEND_ALLOC_HUGE_PAGES");
    if (tmp && ZEND_ATOL(tmp)) {
        zend_mm_use_huge_pages = true;
    }
    alloc_globals->mm_heap = zend_mm_init();
}
 
#ifdef ZTS
static void alloc_globals_dtor(zend_alloc_globals *alloc_globals)
{
    zend_mm_shutdown(alloc_globals->mm_heap, 1, 1);
}
#endif
 
ZEND_API void start_memory_manager(void)
{
#ifndef _WIN32
#  if defined(_SC_PAGESIZE)
    REAL_PAGE_SIZE = sysconf(_SC_PAGESIZE);
#  elif defined(_SC_PAGE_SIZE)
    REAL_PAGE_SIZE = sysconf(_SC_PAGE_SIZE);
#  endif
#endif
#ifdef ZTS
    ts_allocate_fast_id(&alloc_globals_id, &alloc_globals_offset, sizeof(zend_alloc_globals), (ts_allocate_ctor) alloc_globals_ctor, (ts_allocate_dtor) alloc_globals_dtor);
#else
    alloc_globals_ctor(&alloc_globals);
#endif
}
 
ZEND_API zend_mm_heap *zend_mm_set_heap(zend_mm_heap *new_heap)
{
    zend_mm_heap *old_heap;
 
    old_heap = AG(mm_heap);
    AG(mm_heap) = (zend_mm_heap*)new_heap;
    return (zend_mm_heap*)old_heap;
}
 
ZEND_API zend_mm_heap *zend_mm_get_heap(void)
{
    return AG(mm_heap);
}
 
ZEND_API bool zend_mm_is_custom_heap(zend_mm_heap *new_heap)
{
#if ZEND_MM_CUSTOM
    return AG(mm_heap)->use_custom_heap;
#else
    return 0;
#endif
}
 
ZEND_API void zend_mm_set_custom_handlers(zend_mm_heap *heap,
                                          void* (*_malloc)(size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                          void  (*_free)(void* ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                          void* (*_realloc)(void*, size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC))
{
#if ZEND_MM_CUSTOM
    zend_mm_set_custom_handlers_ex(heap, _malloc, _free, _realloc, NULL, NULL);
#endif
}
 
ZEND_API void zend_mm_set_custom_handlers_ex(zend_mm_heap *heap,
                                          void* (*_malloc)(size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                          void  (*_free)(void* ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                          void* (*_realloc)(void*, size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                          size_t (*_gc)(void),
                                          void   (*_shutdown)(bool, bool))
{
#if ZEND_MM_CUSTOM
    zend_mm_heap *_heap = (zend_mm_heap*)heap;
 
    if (!_malloc && !_free && !_realloc) {
        _heap->use_custom_heap = ZEND_MM_CUSTOM_HEAP_NONE;
    } else {
        _heap->use_custom_heap = ZEND_MM_CUSTOM_HEAP_STD;
        _heap->custom_heap._malloc = _malloc;
        _heap->custom_heap._free = _free;
        _heap->custom_heap._realloc = _realloc;
        _heap->custom_heap._gc = _gc;
        _heap->custom_heap._shutdown = _shutdown;
    }
#endif
}
 
ZEND_API void zend_mm_get_custom_handlers(zend_mm_heap *heap,
                                             void* (**_malloc)(size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                             void  (**_free)(void* ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                             void* (**_realloc)(void*, size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC))
{
#if ZEND_MM_CUSTOM
    zend_mm_get_custom_handlers_ex(heap, _malloc, _free, _realloc, NULL, NULL);
#endif
}
 
ZEND_API void zend_mm_get_custom_handlers_ex(zend_mm_heap *heap,
                                             void* (**_malloc)(size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                             void  (**_free)(void* ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                             void* (**_realloc)(void*, size_t ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC),
                                             size_t (**_gc)(void),
                                             void   (**_shutdown)(bool, bool))
{
#if ZEND_MM_CUSTOM
    zend_mm_heap *_heap = (zend_mm_heap*)heap;
 
    if (heap->use_custom_heap) {
        *_malloc = _heap->custom_heap._malloc;
        *_free = _heap->custom_heap._free;
        *_realloc = _heap->custom_heap._realloc;
        if (_gc != NULL) {
            *_gc = _heap->custom_heap._gc;
        }
        if (_shutdown != NULL) {
            *_shutdown = _heap->custom_heap._shutdown;
        }
    } else {
        *_malloc = NULL;
        *_free = NULL;
        *_realloc = NULL;
        if (_gc != NULL) {
            *_gc = NULL;
        }
        if (_shutdown != NULL) {
            *_shutdown = NULL;
        }
    }
#else
    *_malloc = NULL;
    *_free = NULL;
    *_realloc = NULL;
    *_gc = NULL;
    *_shutdown = NULL;
#endif
}
 
ZEND_API zend_mm_storage *zend_mm_get_storage(zend_mm_heap *heap)
{
#if ZEND_MM_STORAGE
    return heap->storage;
#else
    return NULL
#endif
}
 
ZEND_API zend_mm_heap *zend_mm_startup(void)
{
    return zend_mm_init();
}
 
ZEND_API zend_mm_heap *zend_mm_startup_ex(const zend_mm_handlers *handlers, void *data, size_t data_size)
{
#if ZEND_MM_STORAGE
    zend_mm_storage tmp_storage, *storage;
    zend_mm_chunk *chunk;
    zend_mm_heap *heap;
 
    memcpy((zend_mm_handlers*)&tmp_storage.handlers, handlers, sizeof(zend_mm_handlers));
    tmp_storage.data = data;
    chunk = (zend_mm_chunk*)handlers->chunk_alloc(&tmp_storage, ZEND_MM_CHUNK_SIZE, ZEND_MM_CHUNK_SIZE);
    if (UNEXPECTED(chunk == NULL)) {
#if ZEND_MM_ERROR
        fprintf(stderr, "Can't initialize heap\n");
#endif
        return NULL;
    }
    heap = &chunk->heap_slot;
    chunk->heap = heap;
    chunk->next = chunk;
    chunk->prev = chunk;
    chunk->free_pages = ZEND_MM_PAGES - ZEND_MM_FIRST_PAGE;
    chunk->free_tail = ZEND_MM_FIRST_PAGE;
    chunk->num = 0;
    chunk->free_map[0] = (Z_L(1) << ZEND_MM_FIRST_PAGE) - 1;
    chunk->map[0] = ZEND_MM_LRUN(ZEND_MM_FIRST_PAGE);
    heap->main_chunk = chunk;
    heap->cached_chunks = NULL;
    heap->chunks_count = 1;
    heap->peak_chunks_count = 1;
    heap->cached_chunks_count = 0;
    heap->avg_chunks_count = 1.0;
    heap->last_chunks_delete_boundary = 0;
    heap->last_chunks_delete_count = 0;
#if ZEND_MM_STAT || ZEND_MM_LIMIT
    heap->real_size = ZEND_MM_CHUNK_SIZE;
#endif
#if ZEND_MM_STAT
    heap->real_peak = ZEND_MM_CHUNK_SIZE;
    heap->size = 0;
    heap->peak = 0;
#endif
    zend_mm_init_key(heap);
#if ZEND_MM_LIMIT
    heap->limit = (size_t)Z_L(-1) >> 1;
    heap->overflow = 0;
#endif
#if ZEND_MM_CUSTOM
    heap->use_custom_heap = 0;
#endif
    heap->storage = &tmp_storage;
    heap->huge_list = NULL;
    memset(heap->free_slot, 0, sizeof(heap->free_slot));
    storage = _zend_mm_alloc(heap, sizeof(zend_mm_storage) + data_size ZEND_FILE_LINE_CC ZEND_FILE_LINE_CC);
    if (!storage) {
        handlers->chunk_free(&tmp_storage, chunk, ZEND_MM_CHUNK_SIZE);
#if ZEND_MM_ERROR
        fprintf(stderr, "Can't initialize heap\n");
#endif
        return NULL;
    }
    memcpy(storage, &tmp_storage, sizeof(zend_mm_storage));
    if (data) {
        storage->data = (void*)(((char*)storage + sizeof(zend_mm_storage)));
        memcpy(storage->data, data, data_size);
    }
    heap->storage = storage;
    heap->pid = getpid();
    return heap;
#else
    return NULL;
#endif
}
 
ZEND_API void * __zend_malloc(size_t len ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    void *tmp = malloc(len);
    if (EXPECTED(tmp || !len)) {
        return tmp;
    }
    zend_out_of_memory();
}
 
ZEND_API void * __zend_calloc(size_t nmemb, size_t len ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    void *tmp;
 
    len = zend_safe_address_guarded(nmemb, len, 0);
    tmp = __zend_malloc(len ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
    memset(tmp, 0, len);
    return tmp;
}
 
ZEND_API void * __zend_realloc(void *p, size_t len ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    p = realloc(p, len);
    if (EXPECTED(p || !len)) {
        return p;
    }
    zend_out_of_memory();
}
 
ZEND_API void __zend_free(void *p ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
    free(p);
    return;
}
 
ZEND_API char * __zend_strdup(const char *s)
{
    char *tmp = strdup(s);
    if (EXPECTED(tmp)) {
        return tmp;
    }
    zend_out_of_memory();
}
 
#ifdef ZTS
size_t zend_mm_globals_size(void)
{
    return sizeof(zend_alloc_globals);
}
#endif