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dis-bench / src /php /php-src /Zend /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;
union {
HashTable *tracked_allocs;
struct {
bool poison_alloc;
uint8_t poison_alloc_value;
bool poison_free;
uint8_t poison_free_value;
uint8_t padding;
bool check_freelists_on_shutdown;
} debug;
};
#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) {
/** ERROR_INVALID_ADDRESS is expected when addr is not range start address */
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) {
/** ERROR_INVALID_ADDRESS is expected when fixed addr range is not free */
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 && chunk != heap->main_chunk) {
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);
static void *poison_malloc(size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC);
static void zend_mm_check_freelists(zend_mm_heap *heap)
{
for (uint32_t bin_num = 0; bin_num < ZEND_MM_BINS; bin_num++) {
zend_mm_free_slot *slot = heap->free_slot[bin_num];
while (slot) {
slot = zend_mm_get_next_free_slot(heap, bin_num, slot);
}
}
}
#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;
}
#if ZEND_MM_STAT
heap->size = 0;
#endif
}
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);
}
} else if (heap->custom_heap._malloc != poison_malloc) {
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 ZEND_MM_STAT
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
}
#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);
#if ZEND_MM_STAT
heap->size += size;
#endif
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);
#if ZEND_MM_STAT
heap->size -= Z_LVAL_P(size_zv);
#endif
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);
#if ZEND_MM_STAT
heap->size += new_size - old_size;
#endif
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();
}
static void* poison_malloc(size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
zend_mm_heap *heap = AG(mm_heap);
if (SIZE_MAX - heap->debug.padding * 2 < size) {
zend_mm_panic("Integer overflow in memory allocation");
}
size += heap->debug.padding * 2;
void *ptr = zend_mm_alloc_heap(heap, size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
if (EXPECTED(ptr)) {
if (heap->debug.poison_alloc) {
memset(ptr, heap->debug.poison_alloc_value, size);
}
ptr = (char*)ptr + heap->debug.padding;
}
return ptr;
}
static void poison_free(void *ptr ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
zend_mm_heap *heap = AG(mm_heap);
if (EXPECTED(ptr)) {
/* zend_mm_shutdown() will try to free the heap when custom handlers
* are installed */
if (UNEXPECTED(ptr == heap)) {
return;
}
ptr = (char*)ptr - heap->debug.padding;
size_t size = zend_mm_size(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
if (heap->debug.poison_free) {
memset(ptr, heap->debug.poison_free_value, size);
}
}
zend_mm_free_heap(heap, ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
static void* poison_realloc(void *ptr, size_t size ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
zend_mm_heap *heap = AG(mm_heap);
void *new = poison_malloc(size ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
if (ptr) {
/* Determine the size of the old allocation from the unpadded pointer. */
size_t oldsize = zend_mm_size(heap, (char*)ptr - heap->debug.padding ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
/* Remove the padding size to determine the size that is available to the user. */
oldsize -= (2 * heap->debug.padding);
#if ZEND_DEBUG
oldsize -= sizeof(zend_mm_debug_info);
#endif
memcpy(new, ptr, MIN(oldsize, size));
poison_free(ptr ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
}
return new;
}
static size_t poison_gc(void)
{
zend_mm_heap *heap = AG(mm_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);
zend_mm_get_custom_handlers_ex(heap, &_malloc, &_free, &_realloc, &_gc, &_shutdown);
zend_mm_set_custom_handlers_ex(heap, NULL, NULL, NULL, NULL, NULL);
size_t collected = zend_mm_gc(heap);
zend_mm_set_custom_handlers_ex(heap, _malloc, _free, _realloc, _gc, _shutdown);
return collected;
}
static void poison_shutdown(bool full, bool silent)
{
zend_mm_heap *heap = AG(mm_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);
zend_mm_get_custom_handlers_ex(heap, &_malloc, &_free, &_realloc, &_gc, &_shutdown);
zend_mm_set_custom_handlers_ex(heap, NULL, NULL, NULL, NULL, NULL);
if (heap->debug.check_freelists_on_shutdown) {
zend_mm_check_freelists(heap);
}
zend_mm_shutdown(heap, full, silent);
if (!full) {
zend_mm_set_custom_handlers_ex(heap, _malloc, _free, _realloc, _gc, _shutdown);
}
}
static void poison_enable(zend_mm_heap *heap, char *parameters)
{
char *tmp = parameters;
char *end = tmp + strlen(tmp);
/* Trim heading/trailing whitespaces */
while (*tmp == ' ' || *tmp == '\t' || *tmp == '\n') {
tmp++;
}
while (end != tmp && (*(end-1) == ' ' || *(end-1) == '\t' || *(end-1) == '\n')) {
end--;
}
if (tmp == end) {
return;
}
while (1) {
char *key = tmp;
tmp = memchr(tmp, '=', end - tmp);
if (!tmp) {
size_t key_len = end - key;
fprintf(stderr, "Unexpected EOF after ZEND_MM_DEBUG parameter '%.*s', expected '='\n",
(int)key_len, key);
return;
}
size_t key_len = tmp - key;
char *value = tmp + 1;
if (key_len == strlen("poison_alloc")
&& !memcmp(key, "poison_alloc", key_len)) {
heap->debug.poison_alloc = true;
heap->debug.poison_alloc_value = (uint8_t) ZEND_STRTOUL(value, &tmp, 0);
} else if (key_len == strlen("poison_free")
&& !memcmp(key, "poison_free", key_len)) {
heap->debug.poison_free = true;
heap->debug.poison_free_value = (uint8_t) ZEND_STRTOUL(value, &tmp, 0);
} else if (key_len == strlen("padding")
&& !memcmp(key, "padding", key_len)) {
uint8_t padding = ZEND_STRTOUL(value, &tmp, 0);
if (ZEND_MM_ALIGNED_SIZE(padding) != padding) {
fprintf(stderr, "ZEND_MM_DEBUG padding must be a multiple of %u, %u given\n",
(unsigned int)ZEND_MM_ALIGNMENT,
(unsigned int)padding);
return;
}
heap->debug.padding = padding;
} else if (key_len == strlen("check_freelists_on_shutdown")
&& !memcmp(key, "check_freelists_on_shutdown", key_len)) {
heap->debug.check_freelists_on_shutdown = (bool) ZEND_STRTOUL(value, &tmp, 0);
} else {
fprintf(stderr, "Unknown ZEND_MM_DEBUG parameter: '%.*s'\n",
(int)key_len, key);
return;
}
if (tmp == end) {
break;
}
if (*tmp != ',') {
fprintf(stderr, "Unexpected '%c' after value of ZEND_MM_DEBUG parameter '%.*s', expected ','\n",
*tmp, (int)key_len, key);
return;
}
tmp++;
}
zend_mm_set_custom_handlers_ex(heap, poison_malloc, poison_free,
poison_realloc, poison_gc, poison_shutdown);
}
#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();
#if ZEND_MM_CUSTOM
ZEND_ASSERT(!alloc_globals->mm_heap->tracked_allocs);
tmp = getenv("ZEND_MM_DEBUG");
if (tmp) {
poison_enable(alloc_globals->mm_heap, tmp);
}
#endif
}
#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