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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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
/*
* 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_operators.h"
#include "zend_multiply.h"
#include "zend_bitset.h"
#include "zend_mmap.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"
#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>
#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_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
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
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
union {
struct {
void *(*_malloc)(size_t);
void (*_free)(void*);
void *(*_realloc)(void*, size_t);
} std;
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);
} debug;
} custom_heap;
HashTable *tracked_allocs;
#endif
};
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
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 */
/*****************/
#ifndef HAVE_MREMAP
static void *zend_mm_mmap_fixed(void *addr, size_t size)
{
#ifdef _WIN32
return VirtualAlloc(addr, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
#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() failed: [%d] %s\n", errno, strerror(errno));
#endif
return NULL;
} else if (ptr != addr) {
if (munmap(ptr, size) != 0) {
#if ZEND_MM_ERROR
fprintf(stderr, "\nmunmap() failed: [%d] %s\n", errno, strerror(errno));
#endif
}
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
}
static void zend_mm_munmap(void *addr, size_t size)
{
#ifdef _WIN32
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
}
/***********/
/* Bitmask */
/***********/
/* number of trailing set (1) bits */
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_WARNING, "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);
}
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);
zend_mm_munmap(ptr, size + alignment - REAL_PAGE_SIZE);
ptr = zend_mm_mmap_fixed((void*)((char*)ptr + (alignment - offset)), size);
offset = ZEND_MM_ALIGNED_OFFSET(ptr, alignment);
if (offset != 0) {
zend_mm_munmap(ptr, size);
return NULL;
}
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);
}
#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(((zend_uintptr_t)((char*)ptr + (alignment-1)) & (alignment-1)) == (zend_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;
}