+++ /dev/null
-/*
- * Copyright (c) 1999, 2006 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-/* Author: Bertrand Serlet, August 1999 */
-
-#include "scalable_malloc.h"
-#include "malloc_printf.h"
-#include "_simple.h"
-
-#include <pthread_internals.h>
-
-#include <unistd.h>
-#include <libc.h>
-#include <mach/vm_statistics.h>
-#include <mach/mach_init.h>
-#include <sys/types.h>
-#include <sys/mman.h>
-
-/********************* DEFINITIONS ************************/
-
-#define DEBUG_MALLOC 0 // set to one to debug malloc itself
-
-#define DEBUG_CLIENT 0 // set to one to help debug a nasty memory smasher
-
-#if DEBUG_MALLOC
-#warning DEBUG_MALLOC ENABLED
-# define INLINE
-# define ALWAYSINLINE
-# define CHECK_LOCKED(szone, fun) \
-do { \
- if (__is_threaded && TRY_LOCK(szone->lock)) { \
- malloc_printf("*** lock was not set %p in %s\n", szone->lock, fun); \
- } \
-} while (0)
-#else
-# define INLINE __inline__
-# define ALWAYSINLINE __attribute__((always_inline))
-# define CHECK_LOCKED(szone, fun) {}
-#endif
-
-/*
- * Access to global variables is slow, so optimise our handling of vm_page_size
- * and vm_page_shift.
- */
-#define _vm_page_size vm_page_size /* to get to the originals */
-#define _vm_page_shift vm_page_shift
-#define vm_page_size 4096 /* our normal working sizes */
-#define vm_page_shift 12
-
-typedef unsigned short msize_t; // a size in multiples of SHIFT_SMALL_QUANTUM or SHIFT_TINY_QUANTUM
-
-typedef union {
- void *p;
- uintptr_t u;
-} ptr_union;
-
-typedef struct {
- ptr_union previous;
- ptr_union next;
-} free_list_t;
-
-typedef struct {
- uintptr_t address_and_num_pages;
- // this type represents both an address and a number of pages
- // the low bits are the number of pages; the high bits are the address
- // note that the exact number of bits used for depends on the page size
- // also, this cannot represent pointers larger than 1 << (vm_page_shift * 2)
-} compact_range_t;
-
-typedef unsigned char grain_t;
-
-#define CHECK_REGIONS (1 << 31)
-
-#define MAX_RECORDER_BUFFER 256
-
-/********************* DEFINITIONS for tiny ************************/
-
-/*
- * Memory in the Tiny range is allocated from regions (heaps) pointed to by the szone's tiny_regions
- * pointer.
- *
- * Each region is laid out as a heap, followed by a header block, all within
- * a 1MB (2^20) block. This means there are 64520 16-byte blocks and the header is
- * 16138 bytes, making the total 1048458 bytes, leaving 118 bytes unused.
- * The header block is arranged:
- *
- * 0xfc080
- * header bits
- * 0xfe001
- * 0xffffffff pad word
- * 0xfe005
- * in-use bits
- * 0xfff86
- * pad word (not written)
- * 0xfff8a-0xfffff
- * unused
- *
- * Each bitfield comprises NUM_TINY_BLOCKS bits, and refers to the corresponding TINY_QUANTUM block
- * within the heap.
- *
- * The bitfields are used to encode the state of memory within the heap. The header bit indicates
- * that the corresponding quantum is the first quantum in a block (either in use or free). The
- * in-use bit is set for the header if the block has been handed out (allocated). If the header
- * bit is not set, the in-use bit is invalid.
- *
- * The szone maintains an array of 32 freelists, each of which is used to hold
- * free objects of the corresponding quantum size.
- *
- * A free block is laid out depending on its size, in order to fit all free
- * blocks in 16 bytes, on both 32 and 64 bit platforms. One quantum blocks do
- * not store their size in the block, instead relying on the header information
- * to determine their size. Blocks of two or more quanta have room to store
- * their size in the block, and store it both after the 'next' pointer, and in
- * the last 2 bytes of the block.
- *
- * 1-quantum block
- * Offset (32-bit mode) (64-bit mode)
- * 0x0 0x0 : previous
- * 0x4 0x08 : next
- * end end
- *
- * >1-quantum block
- * Offset (32-bit mode) (64-bit mode)
- * 0x0 0x0 : previous
- * 0x4 0x08 : next
- * 0x8 0x10 : size (in quantum counts)
- * end - 2 end - 2 : size (in quantum counts)
- * end end
- *
- * All fields are pointer-sized, except for the size which is an unsigned short.
- *
- */
-
-#define SHIFT_TINY_QUANTUM 4 // Required for AltiVec
-#define TINY_QUANTUM (1 << SHIFT_TINY_QUANTUM)
-
-#define FOLLOWING_TINY_PTR(ptr,msize) (((unsigned char *)(ptr)) + ((msize) << SHIFT_TINY_QUANTUM))
-
-#define NUM_TINY_SLOTS 32 // number of slots for free-lists
-
-#define NUM_TINY_BLOCKS 64520
-#define SHIFT_TINY_CEIL_BLOCKS 16 // ceil(log2(NUM_TINY_BLOCKS))
-#define NUM_TINY_CEIL_BLOCKS (1 << SHIFT_TINY_CEIL_BLOCKS)
-#define TINY_BLOCKS_ALIGN (SHIFT_TINY_CEIL_BLOCKS + SHIFT_TINY_QUANTUM)
-
-/*
- * Enough room for the data, followed by the bit arrays (2-bits per block) plus 2 words of padding
- * as our bitmap operators overflow, plus rounding to the nearest page.
- */
-#define TINY_HEADER_SIZE ((NUM_TINY_BLOCKS >> 2) + 8)
-#define TINY_REGION_SIZE ((NUM_TINY_BLOCKS * TINY_QUANTUM + TINY_HEADER_SIZE + vm_page_size - 1) & ~ (vm_page_size - 1))
-
-/*
- * Beginning and end pointers for a region's heap.
- */
-#define TINY_REGION_ADDRESS(region) ((void *)(region))
-#define TINY_REGION_END(region) (TINY_REGION_ADDRESS(region) + (NUM_TINY_BLOCKS * TINY_QUANTUM))
-
-/*
- * Locate the heap base for a pointer known to be within a tiny region.
- */
-#define TINY_REGION_FOR_PTR(_p) ((void *)((uintptr_t)(_p) & ~((1 << TINY_BLOCKS_ALIGN) - 1)))
-
-/*
- * Convert between byte and msize units.
- */
-#define TINY_BYTES_FOR_MSIZE(_m) ((_m) << SHIFT_TINY_QUANTUM)
-#define TINY_MSIZE_FOR_BYTES(_b) ((_b) >> SHIFT_TINY_QUANTUM)
-
-#ifdef __LP64__
-# define TINY_FREE_SIZE(ptr) (((msize_t *)(ptr))[8])
-#else
-# define TINY_FREE_SIZE(ptr) (((msize_t *)(ptr))[4])
-#endif
-#define TINY_PREVIOUS_MSIZE(ptr) ((msize_t *)(ptr))[-1]
-
-/*
- * Locate the block header for a pointer known to be within a tiny region.
- */
-#define TINY_HEADER_START (NUM_TINY_BLOCKS * TINY_QUANTUM)
-#define TINY_BLOCK_HEADER_FOR_PTR(_p) ((void *)((uintptr_t)TINY_REGION_FOR_PTR(_p) + TINY_HEADER_START))
-
-/*
- * Locate the inuse map for a given block header pointer.
- */
-#define TINY_INUSE_FOR_HEADER(_h) ((void *)((uintptr_t)(_h) + (NUM_TINY_BLOCKS >> 3) + 4))
-
-/*
- * Compute the bitmap index for a pointer known to be within a tiny region.
- */
-#define TINY_INDEX_FOR_PTR(_p) (((uintptr_t)(_p) >> SHIFT_TINY_QUANTUM) & (NUM_TINY_CEIL_BLOCKS - 1))
-
-#define TINY_CACHE 1 // This governs a last-free cache of 1 that bypasses the free-list
-
-#if ! TINY_CACHE
-#warning TINY_CACHE turned off
-#endif
-
-/********************* DEFINITIONS for small ************************/
-
-/*
- * Memory in the Small range is allocated from regions (heaps) pointed to by the szone's small_regions
- * pointer.
- *
- * Each region is laid out as a heap, followed by the metadata array, all within an 8MB (2^23) block.
- * The array is arranged as an array of shorts, one for each SMALL_QUANTUM in the heap.
- * This means there are 16320 512-blocks and the array is 16320*2 bytes, which totals 8388480, leaving
- * 128 bytes unused.
- *
- * The MSB of each short is set for the first quantum in a free block. The low 15 bits encode the
- * block size (in SMALL_QUANTUM units), or are zero if the quantum is not the first in a block.
- *
- * The szone maintains an array of 32 freelists, each of which is used to hold free objects
- * of the corresponding quantum size.
- *
- * A free block is laid out as:
- *
- * Offset (32-bit mode) (64-bit mode)
- * 0x0 0x0 : previous
- * 0x4 0x08 : next
- * 0x8 0x10 : size (in quantum counts)
- * end - 2 end - 2 : size (in quantum counts)
- * end end
- *
- * All fields are pointer-sized, except for the size which is an unsigned short.
- *
- */
-
-#define SMALL_IS_FREE (1 << 15)
-
-#define SHIFT_SMALL_QUANTUM (SHIFT_TINY_QUANTUM + 5) // 9
-#define SMALL_QUANTUM (1 << SHIFT_SMALL_QUANTUM) // 512 bytes
-
-#define FOLLOWING_SMALL_PTR(ptr,msize) (((unsigned char *)(ptr)) + ((msize) << SHIFT_SMALL_QUANTUM))
-
-#define NUM_SMALL_SLOTS 32 // number of slots for free-lists
-
-/*
- * We can only represent up to 1<<15 for msize; but we choose to stay even below that to avoid the
- * convention msize=0 => msize = (1<<15)
- */
-#define NUM_SMALL_BLOCKS 16320
-#define SHIFT_SMALL_CEIL_BLOCKS 14 // ceil(log2(NUM_SMALL_BLOCKs))
-#define NUM_SMALL_CEIL_BLOCKS (1 << SHIFT_SMALL_CEIL_BLOCKS)
-#define SMALL_BLOCKS_ALIGN (SHIFT_SMALL_CEIL_BLOCKS + SHIFT_SMALL_QUANTUM) // 23
-#define SMALL_ARRAY_SIZE (NUM_SMALL_BLOCKS * 2)
-#define SMALL_REGION_SIZE ((NUM_SMALL_BLOCKS * SMALL_QUANTUM + SMALL_ARRAY_SIZE + vm_page_size - 1) & ~ (vm_page_size - 1)) // data + meta data
-
-#define SMALL_PREVIOUS_MSIZE(ptr) ((msize_t *)(ptr))[-1]
-
-/*
- * Convert between byte and msize units.
- */
-#define SMALL_BYTES_FOR_MSIZE(_m) ((_m) << SHIFT_SMALL_QUANTUM)
-#define SMALL_MSIZE_FOR_BYTES(_b) ((_b) >> SHIFT_SMALL_QUANTUM)
-
-
-#define SMALL_REGION_ADDRESS(region) ((unsigned char *)region)
-#define SMALL_REGION_END(region) (SMALL_REGION_ADDRESS(region) + (NUM_SMALL_BLOCKS * SMALL_QUANTUM))
-
-/*
- * Locate the heap base for a pointer known to be within a small region.
- */
-#define SMALL_REGION_FOR_PTR(_p) ((void *)((uintptr_t)(_p) & ~((1 << SMALL_BLOCKS_ALIGN) - 1)))
-
-/*
- * Locate the metadata base for a pointer known to be within a small region.
- */
-#define SMALL_HEADER_START (NUM_SMALL_BLOCKS * SMALL_QUANTUM)
-#define SMALL_META_HEADER_FOR_PTR(_p) ((msize_t *)((uintptr_t)SMALL_REGION_FOR_PTR(_p) + SMALL_HEADER_START))
-
-/*
- * Compute the metadata index for a pointer known to be within a small region.
- */
-#define SMALL_META_INDEX_FOR_PTR(_p) (((uintptr_t)(_p) >> SHIFT_SMALL_QUANTUM) & (NUM_SMALL_CEIL_BLOCKS - 1))
-
-/*
- * Find the metadata word for a pointer known to be within a small region.
- */
-#define SMALL_METADATA_FOR_PTR(_p) (SMALL_META_HEADER_FOR_PTR(_p) + SMALL_META_INDEX_FOR_PTR(_p))
-
-/*
- * Determine whether a pointer known to be within a small region points to memory which is free.
- */
-#define SMALL_PTR_IS_FREE(_p) (*SMALL_METADATA_FOR_PTR(_p) & SMALL_IS_FREE)
-
-/*
- * Extract the msize value for a pointer known to be within a small region.
- */
-#define SMALL_PTR_SIZE(_p) (*SMALL_METADATA_FOR_PTR(_p) & ~SMALL_IS_FREE)
-
-#define PROTECT_SMALL 0 // Should be 0: 1 is too slow for normal use
-
-#define SMALL_CACHE 1
-#if !SMALL_CACHE
-#warning SMALL_CACHE turned off
-#endif
-
-/********************* DEFINITIONS for large and huge ***********************/
-
-#define LARGE_THRESHOLD (15 * 1024) // at or above this use "large"
-
-#if (LARGE_THRESHOLD > NUM_SMALL_SLOTS * SMALL_QUANTUM)
-#error LARGE_THRESHOLD should always be less than NUM_SMALL_SLOTS * SMALL_QUANTUM
-#endif
-
-#define VM_COPY_THRESHOLD (40 * 1024)
- // When all memory is touched after a copy, vm_copy() is always a lose
- // But if the memory is only read, vm_copy() wins over memmove() at 3 or 4 pages (on a G3/300MHz)
- // This must be larger than LARGE_THRESHOLD
-
-/*
- * Given a large_entry, return the address of the allocated block.
- */
-#define LARGE_ENTRY_ADDRESS(entry) \
- (void *)(((entry).address_and_num_pages >> vm_page_shift) << vm_page_shift)
-
-/*
- * Given a large entry, return the number of pages or bytes in the allocated block.
- */
-#define LARGE_ENTRY_NUM_PAGES(entry) \
- ((entry).address_and_num_pages & (vm_page_size - 1))
-#define LARGE_ENTRY_SIZE(entry) \
- (LARGE_ENTRY_NUM_PAGES(entry) << vm_page_shift)
-
-/*
- * Compare a pointer with a large entry.
- */
-#define LARGE_ENTRY_MATCHES(entry,ptr) \
- ((((entry).address_and_num_pages - (uintptr_t)(ptr)) >> vm_page_shift) == 0)
-
-#define LARGE_ENTRY_IS_EMPTY(entry) (((entry).address_and_num_pages) == 0)
-
-typedef compact_range_t large_entry_t;
-typedef vm_range_t huge_entry_t;
-
-/*******************************************************************************
- * Definitions for region hash
- ******************************************************************************/
-
-typedef void * region_t;
-
-#define INITIAL_NUM_REGIONS 63 // Must be odd to hash well
-
-/********************* zone itself ************************/
-
-typedef struct {
- malloc_zone_t basic_zone;
- pthread_lock_t lock;
- unsigned debug_flags;
- void *log_address;
-
- /* Regions for tiny objects */
- size_t num_tiny_regions;
- size_t num_tiny_regions_allocated;
- region_t *tiny_regions; // hashed by location
- region_t *last_tiny_region;
- void *last_tiny_free; // low SHIFT_TINY_QUANTUM indicate the msize
- unsigned tiny_bitmap; // cache of the 32 free lists
- free_list_t *tiny_free_list[NUM_TINY_SLOTS]; // 31 free lists for 1*TINY_QUANTUM to 31*TINY_QUANTUM plus 1 for larger than 32*SMALL_QUANTUM
- size_t tiny_bytes_free_at_end; // the last free region in the last block is treated as a big block in use that is not accounted for
- unsigned num_tiny_objects;
- size_t num_bytes_in_tiny_objects;
-
- /* Regions for small objects */
- size_t num_small_regions;
- size_t num_small_regions_allocated;
- region_t *small_regions; // hashed by location
- region_t *last_small_region;
- void *last_small_free; // low SHIFT_SMALL_QUANTUM indicate the msize
- unsigned small_bitmap; // cache of the free list
- free_list_t *small_free_list[NUM_SMALL_SLOTS];
- size_t small_bytes_free_at_end; // the last free region in the last block is treated as a big block in use that is not accounted for
- unsigned num_small_objects;
- size_t num_bytes_in_small_objects;
-
- /* large objects: vm_page_shift <= log2(size) < 2 *vm_page_shift */
- unsigned num_large_objects_in_use;
- unsigned num_large_entries;
- large_entry_t *large_entries; // hashed by location; null entries don't count
- size_t num_bytes_in_large_objects;
-
- /* huge objects: log2(size) >= 2 *vm_page_shift */
- unsigned num_huge_entries;
- huge_entry_t *huge_entries;
- size_t num_bytes_in_huge_objects;
-
- /* Initial region list */
- region_t initial_tiny_regions[INITIAL_NUM_REGIONS];
- region_t initial_small_regions[INITIAL_NUM_REGIONS];
-} szone_t;
-
-#define SZONE_PAGED_SIZE ((sizeof(szone_t) + vm_page_size - 1) & ~ (vm_page_size - 1))
-
-#if DEBUG_MALLOC || DEBUG_CLIENT
-static void szone_sleep(void);
-#endif
-__private_extern__ void malloc_error_break(void);
-
-// msg prints after fmt, ...
-static void szone_error(szone_t *szone, const char *msg, const void *ptr, const char *fmt, ...) __printflike(4, 5);
-
-static void protect(void *address, size_t size, unsigned protection, unsigned debug_flags);
-static void *allocate_pages(szone_t *szone, size_t size, unsigned char align, unsigned debug_flags, int vm_page_label);
-static void deallocate_pages(szone_t *szone, void *addr, size_t size, unsigned debug_flags);
-static kern_return_t _szone_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr);
-
-static INLINE void free_list_checksum(szone_t *szone, free_list_t *ptr, const char *msg) ALWAYSINLINE;
-static INLINE void free_list_set_checksum(szone_t *szone, free_list_t *ptr) ALWAYSINLINE;
-static INLINE uintptr_t free_list_checksum_ptr(void *p) ALWAYSINLINE;
-static INLINE void * free_list_unchecksum_ptr(ptr_union ptr) ALWAYSINLINE;
-static unsigned free_list_count(const free_list_t *ptr);
-
-static INLINE msize_t get_tiny_meta_header(const void *ptr, boolean_t *is_free) ALWAYSINLINE;
-static INLINE void set_tiny_meta_header_in_use(const void *ptr, msize_t msize) ALWAYSINLINE;
-static INLINE void set_tiny_meta_header_middle(const void *ptr) ALWAYSINLINE;
-static INLINE void set_tiny_meta_header_free(const void *ptr, msize_t msize) ALWAYSINLINE;
-static INLINE boolean_t tiny_meta_header_is_free(const void *ptr) ALWAYSINLINE;
-static INLINE void *tiny_previous_preceding_free(void *ptr, msize_t *prev_msize) ALWAYSINLINE;
-static void tiny_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize);
-static void tiny_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize);
-static INLINE region_t *tiny_region_for_ptr_no_lock(szone_t *szone, const void *ptr) ALWAYSINLINE;
-static INLINE void tiny_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize) ALWAYSINLINE;
-static void *tiny_malloc_from_region_no_lock(szone_t *szone, msize_t msize);
-static INLINE boolean_t try_realloc_tiny_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) ALWAYSINLINE;
-static boolean_t tiny_check_region(szone_t *szone, region_t region);
-static kern_return_t tiny_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder);
-static void *tiny_malloc_from_free_list(szone_t *szone, msize_t msize);
-static INLINE void *tiny_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested) ALWAYSINLINE;
-static INLINE void free_tiny(szone_t *szone, void *ptr, region_t *tiny_region) ALWAYSINLINE;
-static void print_tiny_free_list(szone_t *szone);
-static void print_tiny_region(boolean_t verbose, region_t region, size_t bytes_at_end);
-static boolean_t tiny_free_list_check(szone_t *szone, grain_t slot);
-
-static INLINE void small_meta_header_set_is_free(msize_t *meta_headers, unsigned index, msize_t msize) ALWAYSINLINE;
-static INLINE void small_meta_header_set_in_use(msize_t *meta_headers, msize_t index, msize_t msize) ALWAYSINLINE;
-static INLINE void small_meta_header_set_middle(msize_t *meta_headers, msize_t index) ALWAYSINLINE;
-static void small_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize);
-static void small_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize);
-static INLINE region_t *small_region_for_ptr_no_lock(szone_t *szone, const void *ptr) ALWAYSINLINE;
-static INLINE void small_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize) ALWAYSINLINE;
-static void *small_malloc_from_region_no_lock(szone_t *szone, msize_t msize);
-static INLINE boolean_t try_realloc_small_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) ALWAYSINLINE;
-static boolean_t szone_check_small_region(szone_t *szone, region_t region);
-static kern_return_t small_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder);
-static void *small_malloc_from_free_list(szone_t *szone, msize_t msize);
-static INLINE void *small_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested) ALWAYSINLINE;
-static INLINE void *small_malloc_cleared_no_lock(szone_t *szone, msize_t msize) ALWAYSINLINE;
-static INLINE void free_small(szone_t *szone, void *ptr, region_t *small_region) ALWAYSINLINE;
-static void print_small_free_list(szone_t *szone);
-static void print_small_region(szone_t *szone, boolean_t verbose, region_t region, size_t bytes_at_end);
-static boolean_t small_free_list_check(szone_t *szone, grain_t grain);
-
-static region_t * hash_lookup_region_no_lock(region_t *regions, size_t num_entries, region_t r);
-static void hash_region_insert_no_lock(region_t *regions, size_t num_entries, region_t r);
-static region_t * hash_regions_alloc_no_lock(szone_t *szone, size_t num_entries);
-static region_t * hash_regions_grow_no_lock(szone_t *szone, region_t *regions, size_t old_size, size_t *new_size);
-
-#if DEBUG_MALLOC
-static void large_debug_print(szone_t *szone);
-#endif
-static large_entry_t *large_entry_for_pointer_no_lock(szone_t *szone, const void *ptr);
-static void large_entry_insert_no_lock(szone_t *szone, large_entry_t range);
-static INLINE void large_entries_rehash_after_entry_no_lock(szone_t *szone, large_entry_t *entry) ALWAYSINLINE;
-static INLINE large_entry_t *large_entries_alloc_no_lock(szone_t *szone, unsigned num) ALWAYSINLINE;
-static void large_entries_free_no_lock(szone_t *szone, large_entry_t *entries, unsigned num, vm_range_t *range_to_deallocate);
-static large_entry_t * large_entries_grow_no_lock(szone_t *szone, vm_range_t *range_to_deallocate);
-static vm_range_t large_free_no_lock(szone_t *szone, large_entry_t *entry);
-static kern_return_t large_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t large_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder);
-static huge_entry_t *huge_entry_for_pointer_no_lock(szone_t *szone, const void *ptr);
-static boolean_t huge_entry_append(szone_t *szone, huge_entry_t huge);
-static kern_return_t huge_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t huge_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder);
-static void *large_and_huge_malloc(szone_t *szone, size_t num_pages);
-static INLINE void free_large_or_huge(szone_t *szone, void *ptr) ALWAYSINLINE;
-static INLINE int try_realloc_large_or_huge_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size) ALWAYSINLINE;
-
-static void szone_free(szone_t *szone, void *ptr);
-static INLINE void *szone_malloc_should_clear(szone_t *szone, size_t size, boolean_t cleared_requested) ALWAYSINLINE;
-static void *szone_malloc(szone_t *szone, size_t size);
-static void *szone_calloc(szone_t *szone, size_t num_items, size_t size);
-static void *szone_valloc(szone_t *szone, size_t size);
-static size_t szone_size(szone_t *szone, const void *ptr);
-static void *szone_realloc(szone_t *szone, void *ptr, size_t new_size);
-static unsigned szone_batch_malloc(szone_t *szone, size_t size, void **results, unsigned count);
-static void szone_batch_free(szone_t *szone, void **to_be_freed, unsigned count);
-static void szone_destroy(szone_t *szone);
-static size_t szone_good_size(szone_t *szone, size_t size);
-
-static boolean_t szone_check_all(szone_t *szone, const char *function);
-static boolean_t szone_check(szone_t *szone);
-static kern_return_t szone_ptr_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder);
-static void szone_print(szone_t *szone, boolean_t verbose);
-static void szone_log(malloc_zone_t *zone, void *log_address);
-static void szone_force_lock(szone_t *szone);
-static void szone_force_unlock(szone_t *szone);
-
-static void szone_statistics(szone_t *szone, malloc_statistics_t *stats);
-
-static void *frozen_malloc(szone_t *zone, size_t new_size);
-static void *frozen_calloc(szone_t *zone, size_t num_items, size_t size);
-static void *frozen_valloc(szone_t *zone, size_t new_size);
-static void *frozen_realloc(szone_t *zone, void *ptr, size_t new_size);
-static void frozen_free(szone_t *zone, void *ptr);
-static void frozen_destroy(szone_t *zone);
-
-#if DEBUG_MALLOC
-# define LOG(szone,ptr) \
- (szone->log_address && (((uintptr_t)szone->log_address == -1) || (szone->log_address == (void *)(ptr))))
-#else
-# define LOG(szone,ptr) 0
-#endif
-
-#define SZONE_LOCK(szone) \
- do { \
- LOCK(szone->lock); \
- } while (0)
-
-#define SZONE_UNLOCK(szone) \
- do { \
- UNLOCK(szone->lock); \
- } while (0)
-
-#define LOCK_AND_NOTE_LOCKED(szone,locked) \
-do { \
- CHECK(szone, __PRETTY_FUNCTION__); \
- locked = 1; SZONE_LOCK(szone); \
-} while (0)
-
-#if DEBUG_MALLOC || DEBUG_CLIENT
-# define CHECK(szone,fun) \
- if ((szone)->debug_flags & CHECK_REGIONS) szone_check_all(szone, fun)
-#else
-# define CHECK(szone,fun) do {} while (0)
-#endif
-
-/********************* VERY LOW LEVEL UTILITIES ************************/
-
-#if DEBUG_MALLOC || DEBUG_CLIENT
-static void
-szone_sleep(void)
-{
-
- if (getenv("MallocErrorSleep")) {
- _malloc_printf(ASL_LEVEL_NOTICE, "*** sleeping to help debug\n");
- sleep(3600); // to help debug
- }
-}
-#endif
-
-// msg prints after fmt, ...
-static __attribute__((noinline)) void
-szone_error(szone_t *szone, const char *msg, const void *ptr, const char *fmt, ...)
-{
- va_list ap;
- _SIMPLE_STRING b = _simple_salloc();
-
- if (szone) SZONE_UNLOCK(szone);
- if (b) {
- if (fmt) {
- va_start(ap, fmt);
- _simple_vsprintf(b, fmt, ap);
- va_end(ap);
- }
- if (ptr) {
- _simple_sprintf(b, "*** error for object %p: %s\n", ptr, msg);
- } else {
- _simple_sprintf(b, "*** error: %s\n", msg);
- }
- malloc_printf("%s*** set a breakpoint in malloc_error_break to debug\n", _simple_string(b));
- _simple_sfree(b);
- } else {
- /*
- * Should only get here if vm_allocate() can't get a single page of
- * memory, implying _simple_asl_log() would also fail. So we just
- * print to the file descriptor.
- */
- if (fmt) {
- va_start(ap, fmt);
- _malloc_vprintf(MALLOC_PRINTF_NOLOG, fmt, ap);
- va_end(ap);
- }
- if (ptr) {
- _malloc_printf(MALLOC_PRINTF_NOLOG, "*** error for object %p: %s\n", ptr, msg);
- } else {
- _malloc_printf(MALLOC_PRINTF_NOLOG, "*** error: %s\n", msg);
- }
- _malloc_printf(MALLOC_PRINTF_NOLOG, "*** set a breakpoint in malloc_error_break to debug\n");
- }
- malloc_error_break();
-#if DEBUG_MALLOC
- szone_print(szone, 1);
- szone_sleep();
-#endif
-#if DEBUG_CLIENT
- szone_sleep();
-#endif
- if (szone->debug_flags & SCALABLE_MALLOC_ABORT_ON_ERROR) abort();
-}
-
-static void
-protect(void *address, size_t size, unsigned protection, unsigned debug_flags)
-{
- kern_return_t err;
-
- if (!(debug_flags & SCALABLE_MALLOC_DONT_PROTECT_PRELUDE)) {
- err = vm_protect(mach_task_self(), (vm_address_t)(uintptr_t)address - vm_page_size, vm_page_size, 0, protection);
- if (err) {
- malloc_printf("*** can't protect(%p) region for prelude guard page at %p\n",
- protection,address - (1 << vm_page_shift));
- }
- }
- if (!(debug_flags & SCALABLE_MALLOC_DONT_PROTECT_POSTLUDE)) {
- err = vm_protect(mach_task_self(), (vm_address_t)(uintptr_t)address + size, vm_page_size, 0, protection);
- if (err) {
- malloc_printf("*** can't protect(%p) region for postlude guard page at %p\n",
- protection, address + size);
- }
- }
-}
-
-static void *
-allocate_pages(szone_t *szone, size_t size, unsigned char align, unsigned debug_flags, int vm_page_label)
-{
- // align specifies a desired alignment (as a log) or 0 if no alignment requested
- void *vm_addr;
- uintptr_t addr, aligned_address;
- boolean_t add_guard_pages = debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES;
- size_t allocation_size = round_page(size);
- size_t delta;
-
- if (align) add_guard_pages = 0; // too cumbersome to deal with that
- if (!allocation_size) allocation_size = 1 << vm_page_shift;
- if (add_guard_pages) allocation_size += 2 * (1 << vm_page_shift);
- if (align) allocation_size += (size_t)1 << align;
- vm_addr = mmap(0, allocation_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, VM_MAKE_TAG(vm_page_label), 0);
- if ((uintptr_t)vm_addr == -1) {
- szone_error(szone, "can't allocate region", NULL, "*** mmap(size=%lld) failed (error code=%d)\n", (long long)allocation_size, errno);
- return NULL;
- }
- addr = (uintptr_t)vm_addr;
- if (align) {
- aligned_address = (addr + ((uintptr_t)1 << align) - 1) & ~ (((uintptr_t)1 << align) - 1);
- if (aligned_address != addr) {
- delta = aligned_address - addr;
- if (munmap((void *)addr, delta) == -1)
- malloc_printf("*** freeing unaligned header failed with %d\n", errno);
- addr = aligned_address;
- allocation_size -= delta;
- }
- if (allocation_size > size) {
- if (munmap((void *)(addr + size), allocation_size - size) == -1)
- malloc_printf("*** freeing unaligned footer failed with %d\n", errno);
- }
- }
- if (add_guard_pages) {
- addr += (uintptr_t)1 << vm_page_shift;
- protect((void *)addr, size, 0, debug_flags);
- }
- return (void *)addr;
-}
-
-static void
-deallocate_pages(szone_t *szone, void *addr, size_t size, unsigned debug_flags)
-{
- int err;
- boolean_t add_guard_pages = debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES;
-
- if (add_guard_pages) {
- addr -= 1 << vm_page_shift;
- size += 2 * (1 << vm_page_shift);
- }
- err = munmap(addr, size);
- if ((err == -1) && szone)
- szone_error(szone, "Can't deallocate_pages region", addr, NULL);
-}
-
-static kern_return_t
-_szone_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr)
-{
- *ptr = (void *)address;
- return 0;
-}
-
-/********************* FREE LIST UTILITIES ************************/
-
-// A free list entry is comprised of a pair of pointers, previous and next.
-// Because the free list entries are previously freed objects, there is a
-// non-zero chance that a misbehaved program will write to an allocated object
-// after it has called free() on the pointer. This write would then potentially
-// corrupt the previous and next pointers, leading to a crash. In order to
-// detect this case, we take advantage of the fact that pointers are known to
-// be at least 16 byte aligned, and thus have at least 4 trailing zero bits.
-// When an entry is added to the free list, the previous and next pointers are
-// shifted right by 2 bits, and then have the high and low 2 bits set, to act
-// as guard bits. Before accessing a free list object, we verify that these
-// bits are still set, and log an error if they are not.
-
-static INLINE void
-free_list_checksum(szone_t *szone, free_list_t *ptr, const char *msg)
-{
- uintptr_t ptrs = ptr->previous.u & ptr->next.u;
-
-#ifdef __LP64__
- ptrs = (ptrs << 2) | (ptrs >> (64-2));
-#else
- ptrs = (ptrs << 2) | (ptrs >> (32-2));
-#endif
-
- if ((ptrs & 15) != 15)
- szone_error(szone, "incorrect checksum for freed object "
- "- object was probably modified after being freed.", ptr, NULL);
-}
-
-static INLINE uintptr_t
-free_list_checksum_ptr(void *p)
-{
- ptr_union ptr;
- ptr.p = p;
-
-#ifdef __LP64__
- return (ptr.u >> 2) | 0xC000000000000003ULL;
-#else
- return (ptr.u >> 2) | 0xC0000003U;
-#endif
-}
-
-static INLINE void *
-free_list_unchecksum_ptr(ptr_union ptr)
-{
- uintptr_t u = (ptr.u >> 2) << 4;
- return (void *)u;
-}
-
-static INLINE void
-free_list_set_checksum(szone_t *szone, free_list_t *ptr)
-{
- ptr->previous.u = free_list_checksum_ptr(ptr->previous.p);
- ptr->next.u = free_list_checksum_ptr(ptr->next.p);
-}
-
-static unsigned
-free_list_count(const free_list_t *ptr)
-{
- unsigned count = 0;
-
- while (ptr) {
- count++;
- ptr = free_list_unchecksum_ptr(ptr->next);
- }
- return count;
-}
-
-/* XXX inconsistent use of BITMAP32 and BITARRAY operations could be cleaned up */
-
-#define BITMAP32_SET(bitmap,bit) (bitmap |= 1 << (bit))
-#define BITMAP32_CLR(bitmap,bit) (bitmap &= ~ (1 << (bit)))
-#define BITMAP32_BIT(bitmap,bit) ((bitmap >> (bit)) & 1)
-
-/* returns bit # of least-significant one bit, starting at 0 (undefined if !bitmap) */
-#define BITMAP32_CTZ(bitmap) (__builtin_ctz(bitmap))
-
-/********************* TINY FREE LIST UTILITIES ************************/
-
-// We encode the meta-headers as follows:
-// Each quantum has an associated set of 2 bits:
-// block_header when 1 says this block is the beginning of a block
-// in_use when 1 says this block is in use
-// so a block in use of size 3 is 1-1 0-X 0-X
-// for a free block TINY_FREE_SIZE(ptr) carries the size and the bits are 1-0 X-X X-X
-// for a block middle the bits are 0-0
-
-// Attention double evaluation for these
-#define BITARRAY_SET(bits,index) (bits[index>>3] |= (1 << (index & 7)))
-#define BITARRAY_CLR(bits,index) (bits[index>>3] &= ~(1 << (index & 7)))
-#define BITARRAY_BIT(bits,index) (((bits[index>>3]) >> (index & 7)) & 1)
-
-// Following is for start<8 and end<=start+32
-static void ALWAYSINLINE
-bitarray_mclr(void *bits, unsigned start, unsigned end) {
- unsigned word = OSReadLittleInt32(bits, 0);
- unsigned mask = (0xFFFFFFFFU >> (31 - start)) >> 1;
-
- if (end > 31) {
- unsigned char *bytes = (unsigned char *)bits;
- bytes[4] &= ~((1 << (end - 32)) - 1);
- } else {
- mask |= (0xFFFFFFFF << end);
- }
- OSWriteLittleInt32(bits, 0, word & mask);
-}
-
-/*
- * Obtain the size of a free tiny block (in msize_t units).
- */
-static msize_t
-get_tiny_free_size(const void *ptr)
-{
- void *next_block = (void *)((uintptr_t)ptr + TINY_QUANTUM);
- void *region_end = TINY_REGION_END(TINY_REGION_FOR_PTR(ptr));
-
- // check whether the next block is outside the tiny region or a block header
- // if so, then the size of this block is one, and there is no stored size.
- if (next_block < region_end)
- {
- unsigned char *next_header = TINY_BLOCK_HEADER_FOR_PTR(next_block);
- msize_t next_index = TINY_INDEX_FOR_PTR(next_block);
-
- if (!BITARRAY_BIT(next_header, next_index))
- return TINY_FREE_SIZE(ptr);
- }
- return 1;
-}
-
-/*
- * Get the size of the previous free block, which is stored in the last two
- * bytes of the block. If the previous block is not free, then the result is
- * undefined.
- */
-static msize_t
-get_tiny_previous_free_msize(const void *ptr)
-{
- // check whether the previous block is in the tiny region and a block header
- // if so, then the size of the previous block is one, and there is no stored
- // size.
- if (ptr != TINY_REGION_FOR_PTR(ptr))
- {
- void *prev_block = (void *)((uintptr_t)ptr - TINY_QUANTUM);
- unsigned char *prev_header = TINY_BLOCK_HEADER_FOR_PTR(prev_block);
- msize_t prev_index = TINY_INDEX_FOR_PTR(prev_block);
- if (BITARRAY_BIT(prev_header, prev_index))
- return 1;
- return TINY_PREVIOUS_MSIZE(ptr);
- }
- // don't read possibly unmapped memory before the beginning of the region
- return 0;
-}
-
-static INLINE msize_t
-get_tiny_meta_header(const void *ptr, boolean_t *is_free)
-{
- // returns msize and is_free
- // may return 0 for the msize component (meaning 65536)
- unsigned char *block_header;
- unsigned char *in_use;
- msize_t index;
- unsigned byte_index;
-
- block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
- index = TINY_INDEX_FOR_PTR(ptr);
- byte_index = index >> 3;
-
- block_header += byte_index;
- index &= 7;
- *is_free = 0;
- if (!BITMAP32_BIT(*block_header, index))
- return 0;
- in_use = TINY_INUSE_FOR_HEADER(block_header);
- if (!BITMAP32_BIT(*in_use, index)) {
- *is_free = 1;
- return get_tiny_free_size(ptr);
- }
- uint32_t *addr = (uint32_t *)((uintptr_t)block_header & ~3);
- uint32_t word0 = OSReadLittleInt32(addr, 0) >> index;
- uint32_t word1 = OSReadLittleInt32(addr, 4) << (8 - index);
- uint32_t bits = (((uintptr_t)block_header & 3) * 8); // precision loss on LP64 OK here
- uint32_t word = (word0 >> bits) | (word1 << (24 - bits));
- uint32_t result = ffs(word >> 1);
- return result;
-}
-
-static INLINE void
-set_tiny_meta_header_in_use(const void *ptr, msize_t msize)
-{
- unsigned char *block_header;
- unsigned char *in_use;
- msize_t index;
- unsigned byte_index;
- msize_t clr_msize;
- unsigned end_bit;
-
- block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
- index = TINY_INDEX_FOR_PTR(ptr);
- byte_index = index >> 3;
-
-#if DEBUG_MALLOC
- if (msize >= 32)
- malloc_printf("set_tiny_meta_header_in_use() invariant broken %p %d\n", ptr, msize);
- if ((unsigned)index + (unsigned)msize > 0x10000)
- malloc_printf("set_tiny_meta_header_in_use() invariant broken (2) %p %d\n", ptr, msize);
-#endif
- block_header += byte_index;
- index &= 7;
- BITMAP32_SET(*block_header, index);
- in_use = TINY_INUSE_FOR_HEADER(block_header);
- BITMAP32_SET(*in_use, index);
- index++;
- clr_msize = msize-1;
- if (clr_msize) {
- byte_index = index >> 3;
- block_header += byte_index; in_use += byte_index;
- index &= 7;
- end_bit = index + clr_msize;
- bitarray_mclr(block_header, index, end_bit);
- bitarray_mclr(in_use, index, end_bit);
- }
- BITARRAY_SET(block_header, index+clr_msize); // we set the block_header bit for the following block to reaffirm next block is a block
-#if DEBUG_MALLOC
- {
- boolean_t ff;
- msize_t mf;
-
- mf = get_tiny_meta_header(ptr, &ff);
- if (msize != mf) {
- malloc_printf("setting header for tiny in_use %p : %d\n", ptr, msize);
- malloc_printf("reading header for tiny %p : %d %d\n", ptr, mf, ff);
- }
- }
-#endif
-}
-
-static INLINE void
-set_tiny_meta_header_middle(const void *ptr)
-{
- // indicates this block is in the middle of an in use block
- unsigned char *block_header;
- unsigned char *in_use;
- msize_t index;
-
- block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
- in_use = TINY_INUSE_FOR_HEADER(block_header);
- index = TINY_INDEX_FOR_PTR(ptr);
-
- BITARRAY_CLR(block_header, index);
- BITARRAY_CLR(in_use, index);
-}
-
-static INLINE void
-set_tiny_meta_header_free(const void *ptr, msize_t msize)
-{
- // !msize is acceptable and means 65536
- unsigned char *block_header;
- unsigned char *in_use;
- msize_t index;
-
- block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
- in_use = TINY_INUSE_FOR_HEADER(block_header);
- index = TINY_INDEX_FOR_PTR(ptr);
-
-#if DEBUG_MALLOC
- if ((unsigned)index + (unsigned)msize > 0x10000) {
- malloc_printf("setting header for tiny free %p msize too large: %d\n", ptr, msize);
- }
-#endif
- BITARRAY_SET(block_header, index);
- BITARRAY_CLR(in_use, index);
- // mark the end of this block if msize is > 1. For msize == 0, the whole
- // region is free, so there is no following block. For msize == 1, there is
- // no space to write the size on 64 bit systems. The size for 1 quantum
- // blocks is computed from the metadata bitmaps.
- if (msize > 1) {
- void *follower = FOLLOWING_TINY_PTR(ptr, msize);
- TINY_PREVIOUS_MSIZE(follower) = msize;
- TINY_FREE_SIZE(ptr) = msize;
- }
- if (msize == 0) {
- TINY_FREE_SIZE(ptr) = msize;
- }
-#if DEBUG_MALLOC
- boolean_t ff;
- msize_t mf = get_tiny_meta_header(ptr, &ff);
- if ((msize != mf) || !ff) {
- malloc_printf("setting header for tiny free %p : %u\n", ptr, msize);
- malloc_printf("reading header for tiny %p : %u %u\n", ptr, mf, ff);
- }
-#endif
-}
-
-static INLINE boolean_t
-tiny_meta_header_is_free(const void *ptr)
-{
- unsigned char *block_header;
- unsigned char *in_use;
- msize_t index;
-
- block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
- in_use = TINY_INUSE_FOR_HEADER(block_header);
- index = TINY_INDEX_FOR_PTR(ptr);
- if (!BITARRAY_BIT(block_header, index))
- return 0;
- return !BITARRAY_BIT(in_use, index);
-}
-
-static INLINE void *
-tiny_previous_preceding_free(void *ptr, msize_t *prev_msize)
-{
- // returns the previous block, assuming and verifying it's free
- unsigned char *block_header;
- unsigned char *in_use;
- msize_t index;
- msize_t previous_msize;
- msize_t previous_index;
- void *previous_ptr;
-
- block_header = TINY_BLOCK_HEADER_FOR_PTR(ptr);
- in_use = TINY_INUSE_FOR_HEADER(block_header);
- index = TINY_INDEX_FOR_PTR(ptr);
-
- if (!index)
- return NULL;
- if ((previous_msize = get_tiny_previous_free_msize(ptr)) > index)
- return NULL;
-
- previous_index = index - previous_msize;
- previous_ptr = (void *)(TINY_REGION_FOR_PTR(ptr) + TINY_BYTES_FOR_MSIZE(previous_index));
- if (!BITARRAY_BIT(block_header, previous_index))
- return NULL;
- if (BITARRAY_BIT(in_use, previous_index))
- return NULL;
- if (get_tiny_free_size(previous_ptr) != previous_msize)
- return NULL;
-
- // conservative check did match true check
- *prev_msize = previous_msize;
- return previous_ptr;
-}
-
-/*
- * Adds an item to the proper free list, and also marks the meta-header of the
- * block properly.
- * Assumes szone has been locked
- */
-static void
-tiny_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize)
-{
- grain_t slot = (!msize || (msize >= NUM_TINY_SLOTS)) ? NUM_TINY_SLOTS - 1 : msize - 1;
- free_list_t *free_ptr = ptr;
- free_list_t *free_head = szone->tiny_free_list[slot];
-
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
- }
- if (((uintptr_t)ptr) & (TINY_QUANTUM - 1)) {
- szone_error(szone, "tiny_free_list_add_ptr: Unaligned ptr", ptr, NULL);
- }
-#endif
- set_tiny_meta_header_free(ptr, msize);
- if (free_head) {
- free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
-#if DEBUG_MALLOC
- if (free_list_unchecksum_ptr(free_head->previous)) {
- szone_error(szone, "tiny_free_list_add_ptr: Internal invariant broken (free_head->previous)", ptr,
- "ptr=%p slot=%d free_head=%p previous=%p\n", ptr, slot, free_head, free_head->previous.p);
- }
- if (! tiny_meta_header_is_free(free_head)) {
- szone_error(szone, "tiny_free_list_add_ptr: Internal invariant broken (free_head is not a free pointer)", ptr,
- "ptr=%p slot=%d free_head=%p\n", ptr, slot, free_head);
- }
-#endif
- free_head->previous.u = free_list_checksum_ptr(free_ptr);
- } else {
- BITMAP32_SET(szone->tiny_bitmap, slot);
- }
- free_ptr->previous.p = NULL;
- free_ptr->next.p = free_head;
- free_list_set_checksum(szone, free_ptr);
- szone->tiny_free_list[slot] = free_ptr;
-}
-
-/*
- * Removes the item pointed to by ptr in the proper free list.
- * Assumes szone has been locked
- */
-static INLINE void
-tiny_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize)
-{
- grain_t slot = (!msize || (msize >= NUM_TINY_SLOTS)) ? NUM_TINY_SLOTS - 1 : msize - 1;
- free_list_t *free_ptr = ptr, *next, *previous;
- free_list_checksum(szone, free_ptr, __PRETTY_FUNCTION__);
-
- next = free_list_unchecksum_ptr(free_ptr->next);
- previous = free_list_unchecksum_ptr(free_ptr->previous);
-
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
- }
-#endif
- if (!previous) {
- // The block to remove is the head of the free list
-#if DEBUG_MALLOC
- if (szone->tiny_free_list[slot] != ptr) {
- szone_error(szone, "tiny_free_list_remove_ptr: Internal invariant broken (szone->tiny_free_list[slot])", ptr,
- "ptr=%p slot=%d msize=%d szone->tiny_free_list[slot]=%p\n",
- ptr, slot, msize, szone->tiny_free_list[slot]);
- return;
- }
-#endif
- szone->tiny_free_list[slot] = next;
- if (!next) BITMAP32_CLR(szone->tiny_bitmap, slot);
- } else {
- // We know free_ptr is already checksummed, so we don't need to do it
- // again.
- previous->next = free_ptr->next;
- }
- if (next) {
- // We know free_ptr is already checksummed, so we don't need to do it
- // again.
- next->previous = free_ptr->previous;
- }
-}
-
-/*
- * tiny_region_for_ptr_no_lock - Returns the tiny region containing the pointer,
- * or NULL if not found.
- */
-static INLINE region_t *
-tiny_region_for_ptr_no_lock(szone_t *szone, const void *ptr)
-{
- return hash_lookup_region_no_lock(szone->tiny_regions,
- szone->num_tiny_regions_allocated,
- TINY_REGION_FOR_PTR(ptr));
-}
-
-static INLINE void
-tiny_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize)
-{
- size_t original_size = TINY_BYTES_FOR_MSIZE(msize);
- void *next_block = ((char *)ptr + original_size);
- msize_t previous_msize;
- void *previous;
- msize_t next_msize;
- free_list_t *big_free_block;
- free_list_t *after_next_block;
- free_list_t *before_next_block;
-
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in tiny_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
- }
- if (! msize) {
- szone_error(szone, "trying to free tiny block that is too small", ptr,
- "in tiny_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- // We try to coalesce this block with the preceeding one
- previous = tiny_previous_preceding_free(ptr, &previous_msize);
- if (previous) {
-#if DEBUG_MALLOC
- if (LOG(szone, ptr) || LOG(szone,previous)) {
- malloc_printf("in tiny_free_no_lock(), coalesced backwards for %p previous=%p\n", ptr, previous);
- }
-#endif
- // clear the meta_header since this is no longer the start of a block
- set_tiny_meta_header_middle(ptr);
- tiny_free_list_remove_ptr(szone, previous, previous_msize);
- ptr = previous;
- msize += previous_msize;
- }
- // We try to coalesce with the next block
- if ((next_block < TINY_REGION_END(*region)) && tiny_meta_header_is_free(next_block)) {
- next_msize = get_tiny_free_size(next_block);
-#if DEBUG_MALLOC
- if (LOG(szone, ptr) || LOG(szone, next_block)) {
- malloc_printf("in tiny_free_no_lock(), for ptr=%p, msize=%d coalesced forward=%p next_msize=%d\n",
- ptr, msize, next_block, next_msize);
- }
-#endif
- // If we are coalescing with the next block, and the next block is in
- // the last slot of the free list, then we optimize this case here to
- // avoid removing next_block from the slot 31 and then adding ptr back
- // to slot 31.
- if (next_msize >= NUM_TINY_SLOTS) {
- msize += next_msize;
- big_free_block = (free_list_t *)next_block;
- free_list_checksum(szone, big_free_block, __PRETTY_FUNCTION__);
- after_next_block = free_list_unchecksum_ptr(big_free_block->next);
- before_next_block = free_list_unchecksum_ptr(big_free_block->previous);
- if (!before_next_block) {
- szone->tiny_free_list[NUM_TINY_SLOTS-1] = ptr;
- } else {
- before_next_block->next.u = free_list_checksum_ptr(ptr);
- }
- if (after_next_block) {
- after_next_block->previous.u = free_list_checksum_ptr(ptr);
- }
- // we don't need to checksum these since they are already checksummed
- ((free_list_t *)ptr)->previous = big_free_block->previous;
- ((free_list_t *)ptr)->next = big_free_block->next;
-
- // clear the meta_header to enable coalescing backwards
- set_tiny_meta_header_middle(big_free_block);
- set_tiny_meta_header_free(ptr, msize);
- goto tiny_free_ending;
- }
- tiny_free_list_remove_ptr(szone, next_block, next_msize);
- set_tiny_meta_header_middle(next_block); // clear the meta_header to enable coalescing backwards
- msize += next_msize;
- }
-#if !TINY_CACHE
- // The tiny cache already scribbles free blocks as they go through the
- // cache, so we do not need to do it here.
- if ((szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) && msize) {
- memset(ptr, 0x55, TINY_BYTES_FOR_MSIZE(msize));
- }
-#endif
- tiny_free_list_add_ptr(szone, ptr, msize);
- tiny_free_ending:
- // When in proper debug mode we write on the memory to help debug memory smashers
- szone->num_tiny_objects--;
- szone->num_bytes_in_tiny_objects -= original_size; // we use original_size and not msize to avoid double counting the coalesced blocks
-}
-
-// Allocates from the last region or a freshly allocated region
-static void *
-tiny_malloc_from_region_no_lock(szone_t *szone, msize_t msize)
-{
- void *last_block, *ptr, *aligned_address;
- unsigned char *last_header;
- msize_t last_msize, last_index;
-
- // Before anything we transform any remaining tiny_bytes_free_at_end into a
- // regular free block. We take special care here to update the bitfield
- // information, since we are bypassing the normal free codepath. If there
- // is more than one quanta worth of memory in tiny_bytes_free_at_end, then
- // there will be two block headers:
- // 1) header for the free space at end, msize = 1
- // 2) header inserted by set_tiny_meta_header_in_use after block
- // We must clear the second one so that when the free block's size is
- // queried, we do not think the block is only 1 quantum in size because
- // of the second set header bit.
- if (szone->tiny_bytes_free_at_end) {
- last_block = TINY_REGION_END(szone->last_tiny_region) - szone->tiny_bytes_free_at_end;
- last_msize = TINY_MSIZE_FOR_BYTES(szone->tiny_bytes_free_at_end);
- last_header = TINY_BLOCK_HEADER_FOR_PTR(last_block);
- last_index = TINY_INDEX_FOR_PTR(last_block);
-
- if (last_index != (NUM_TINY_BLOCKS - 1))
- BITARRAY_CLR(last_header, last_index + 1);
-
- tiny_free_list_add_ptr(szone, last_block, last_msize);
- szone->tiny_bytes_free_at_end = 0;
- }
- // time to create a new region
- aligned_address = allocate_pages(szone, TINY_REGION_SIZE, TINY_BLOCKS_ALIGN, 0, VM_MEMORY_MALLOC_TINY);
- if (!aligned_address) // out of memory!
- return NULL;
- // We set the padding after block_header to be all 1
- ((uint32_t *)(aligned_address + TINY_HEADER_START + (NUM_TINY_BLOCKS >> 3)))[0] = ~0;
-
- // Check to see if the hash ring of tiny regions needs to grow. Try to
- // avoid the hash ring becoming too dense.
- if (szone->num_tiny_regions_allocated < (2 * szone->num_tiny_regions)) {
- region_t *new_regions;
- size_t new_size;
- new_regions = hash_regions_grow_no_lock(szone, szone->tiny_regions,
- szone->num_tiny_regions_allocated,
- &new_size);
- // Do not deallocate the current tiny_regions allocation since someone may
- // be iterating it. Instead, just leak it.
- szone->tiny_regions = new_regions;
- szone->num_tiny_regions_allocated = new_size;
- }
- // Insert the new region into the hash ring, and update malloc statistics
- hash_region_insert_no_lock(szone->tiny_regions,
- szone->num_tiny_regions_allocated,
- aligned_address);
- szone->last_tiny_region = aligned_address;
-
- szone->num_tiny_regions++;
- ptr = aligned_address;
- set_tiny_meta_header_in_use(ptr, msize);
- szone->num_tiny_objects++;
- szone->num_bytes_in_tiny_objects += TINY_BYTES_FOR_MSIZE(msize);
-
- // We put a header on the last block so that it appears in use (for coalescing, etc...)
- set_tiny_meta_header_in_use(ptr + TINY_BYTES_FOR_MSIZE(msize), 1);
- szone->tiny_bytes_free_at_end = TINY_BYTES_FOR_MSIZE(NUM_TINY_BLOCKS - msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in tiny_malloc_from_region_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- return ptr;
-}
-
-static INLINE boolean_t
-try_realloc_tiny_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size)
-{
- // returns 1 on success
- msize_t index;
- msize_t old_msize;
- unsigned next_index;
- void *next_block;
- boolean_t is_free;
- msize_t next_msize, coalesced_msize, leftover_msize;
- void *leftover;
-
- index = TINY_INDEX_FOR_PTR(ptr);
- old_msize = TINY_MSIZE_FOR_BYTES(old_size);
- next_index = index + old_msize;
-
- if (next_index >= NUM_TINY_BLOCKS) {
- return 0;
- }
- next_block = (char *)ptr + old_size;
- SZONE_LOCK(szone);
- is_free = tiny_meta_header_is_free(next_block);
- if (!is_free) {
- SZONE_UNLOCK(szone);
- return 0; // next_block is in use;
- }
- next_msize = get_tiny_free_size(next_block);
- if (old_size + TINY_MSIZE_FOR_BYTES(next_msize) < new_size) {
- SZONE_UNLOCK(szone);
- return 0; // even with next block, not enough
- }
- tiny_free_list_remove_ptr(szone, next_block, next_msize);
- set_tiny_meta_header_middle(next_block); // clear the meta_header to enable coalescing backwards
- coalesced_msize = TINY_MSIZE_FOR_BYTES(new_size - old_size + TINY_QUANTUM - 1);
- leftover_msize = next_msize - coalesced_msize;
- if (leftover_msize) {
- leftover = next_block + TINY_BYTES_FOR_MSIZE(coalesced_msize);
- tiny_free_list_add_ptr(szone, leftover, leftover_msize);
- }
- set_tiny_meta_header_in_use(ptr, old_msize + coalesced_msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in try_realloc_tiny_in_place(), ptr=%p, msize=%d\n", ptr, old_msize + coalesced_msize);
- }
-#endif
- szone->num_bytes_in_tiny_objects += TINY_BYTES_FOR_MSIZE(coalesced_msize);
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- return 1;
-}
-
-static boolean_t
-tiny_check_region(szone_t *szone, region_t region)
-{
- uintptr_t start, ptr, region_end;
- boolean_t prev_free = 0;
- boolean_t is_free;
- msize_t msize;
- free_list_t *free_head;
- void *follower, *previous, *next;
-
- /* establish region limits */
- start = (uintptr_t)TINY_REGION_ADDRESS(region);
- ptr = start;
- region_end = (uintptr_t)TINY_REGION_END(region);
-
- /*
- * The last region may have a trailing chunk which has not been converted into inuse/freelist
- * blocks yet.
- */
- if (region == szone->last_tiny_region)
- region_end -= szone->tiny_bytes_free_at_end;
-
-
- /*
- * Scan blocks within the region.
- */
- while (ptr < region_end) {
- /*
- * If the first block is free, and its size is 65536 (msize = 0) then the entire region is
- * free.
- */
- msize = get_tiny_meta_header((void *)ptr, &is_free);
- if (is_free && !msize && (ptr == start)) {
- return 1;
- }
-
- /*
- * If the block's size is 65536 (msize = 0) then since we're not the first entry the size is
- * corrupt.
- */
- if (!msize) {
- malloc_printf("*** invariant broken for tiny block %p this msize=%d - size is too small\n",
- ptr, msize);
- return 0;
- }
-
- if (!is_free) {
- /*
- * In use blocks cannot be more than 31 quanta large.
- */
- prev_free = 0;
- if (msize > 31 * TINY_QUANTUM) {
- malloc_printf("*** invariant broken for %p this tiny msize=%d[%p] - size is too large\n",
- ptr, msize, msize);
- return 0;
- }
- /* move to next block */
- ptr += TINY_BYTES_FOR_MSIZE(msize);
- } else {
- /*
- * Free blocks must have been coalesced, we cannot have a free block following another
- * free block.
- */
- if (prev_free) {
- malloc_printf("*** invariant broken for free block %p this tiny msize=%d: two free blocks in a row\n",
- ptr, msize);
- return 0;
- }
- prev_free = 1;
- /*
- * Check the integrity of this block's entry in its freelist.
- */
- free_head = (free_list_t *)ptr;
- free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
- previous = free_list_unchecksum_ptr(free_head->previous);
- next = free_list_unchecksum_ptr(free_head->next);
- if (previous && !tiny_meta_header_is_free(previous)) {
- malloc_printf("*** invariant broken for %p (previous %p is not a free pointer)\n",
- ptr, previous);
- return 0;
- }
- if (next && !tiny_meta_header_is_free(next)) {
- malloc_printf("*** invariant broken for %p (next in free list %p is not a free pointer)\n",
- ptr, next);
- return 0;
- }
- /*
- * Check the free block's trailing size value.
- */
- follower = FOLLOWING_TINY_PTR(ptr, msize);
- if (((uintptr_t)follower != region_end) && (get_tiny_previous_free_msize(follower) != msize)) {
- malloc_printf("*** invariant broken for tiny free %p followed by %p in region [%p-%p] "
- "(end marker incorrect) should be %d; in fact %d\n",
- ptr, follower, TINY_REGION_ADDRESS(region), region_end, msize, get_tiny_previous_free_msize(follower));
- return 0;
- }
- /* move to next block */
- ptr = (uintptr_t)follower;
- }
- }
- /*
- * Ensure that we scanned the entire region
- */
- if (ptr != region_end) {
- malloc_printf("*** invariant broken for region end %p - %p\n", ptr, region_end);
- return 0;
- }
- /*
- * Check the trailing block's integrity.
- */
- if (region == szone->last_tiny_region) {
- if (szone->tiny_bytes_free_at_end) {
- msize = get_tiny_meta_header((void *)ptr, &is_free);
- if (is_free || (msize != 1)) {
- malloc_printf("*** invariant broken for blocker block %p - %d %d\n", ptr, msize, is_free);
- }
- }
- }
- return 1;
-}
-
-static kern_return_t
-tiny_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder)
-{
- size_t num_regions = szone->num_tiny_regions_allocated;
- void *last_tiny_free = szone->last_tiny_free;
- size_t index;
- region_t *regions;
- vm_range_t buffer[MAX_RECORDER_BUFFER];
- unsigned count = 0;
- kern_return_t err;
- region_t region;
- vm_range_t range;
- vm_range_t admin_range;
- vm_range_t ptr_range;
- unsigned char *mapped_region;
- unsigned char *block_header;
- unsigned char *in_use;
- unsigned block_index;
- unsigned block_limit;
- boolean_t is_free;
- msize_t msize;
- void *mapped_ptr;
- unsigned bit;
- vm_address_t last_tiny_free_ptr = 0;
- msize_t last_tiny_free_msize = 0;
-
- if (last_tiny_free) {
- last_tiny_free_ptr = (uintptr_t) last_tiny_free & ~(TINY_QUANTUM - 1);
- last_tiny_free_msize = (uintptr_t) last_tiny_free & (TINY_QUANTUM - 1);
- }
-
- err = reader(task, (vm_address_t)szone->tiny_regions, sizeof(region_t) * num_regions, (void **)®ions);
- if (err) return err;
- for (index = 0; index < num_regions; ++index) {
- region = regions[index];
- if (region) {
- range.address = (vm_address_t)TINY_REGION_ADDRESS(region);
- range.size = (vm_size_t)TINY_REGION_SIZE;
- if (type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) {
- admin_range.address = range.address + TINY_HEADER_START;
- admin_range.size = TINY_HEADER_SIZE;
- recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &admin_range, 1);
- }
- if (type_mask & (MALLOC_PTR_REGION_RANGE_TYPE | MALLOC_ADMIN_REGION_RANGE_TYPE)) {
- ptr_range.address = range.address;
- ptr_range.size = NUM_TINY_BLOCKS * TINY_QUANTUM;
- recorder(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &ptr_range, 1);
- }
- if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
- err = reader(task, range.address, range.size, (void **)&mapped_region);
- if (err)
- return err;
-
- block_header = (unsigned char *)(mapped_region + TINY_HEADER_START);
- in_use = TINY_INUSE_FOR_HEADER(block_header);
- block_index = 0;
- block_limit = NUM_TINY_BLOCKS;
- if (region == szone->last_tiny_region)
- block_limit -= TINY_MSIZE_FOR_BYTES(szone->tiny_bytes_free_at_end);
-
- while (block_index < block_limit) {
- vm_size_t block_offset = TINY_BYTES_FOR_MSIZE(block_index);
- is_free = !BITARRAY_BIT(in_use, block_index);
- if (is_free) {
- mapped_ptr = mapped_region + block_offset;
-
- // mapped_region, the address at which 'range' in 'task' has been
- // mapped into our process, is not necessarily aligned to
- // TINY_BLOCKS_ALIGN.
- //
- // Since the code in get_tiny_free_size() assumes the pointer came
- // from a properly aligned tiny region, and mapped_region is not
- // necessarily aligned, then do the size calculation directly.
- // If the next bit is set in the header bitmap, then the size is one
- // quantum. Otherwise, read the size field.
- if (!BITARRAY_BIT(block_header, block_index+1))
- msize = TINY_FREE_SIZE(mapped_ptr);
- else
- msize = 1;
-
- if (!msize)
- break;
- } else if (range.address + block_offset != last_tiny_free_ptr) {
- msize = 1;
- bit = block_index + 1;
- while (! BITARRAY_BIT(block_header, bit)) {
- bit++;
- msize ++;
- }
- buffer[count].address = range.address + block_offset;
- buffer[count].size = TINY_BYTES_FOR_MSIZE(msize);
- count++;
- if (count >= MAX_RECORDER_BUFFER) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- count = 0;
- }
- } else {
- // Block is not free but it matches last_tiny_free_ptr so even
- // though it is not marked free in the bitmap, we treat it as if
- // it is and move on
- msize = last_tiny_free_msize;
- }
- block_index += msize;
- }
- }
- }
- }
- if (count) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- }
- return 0;
-}
-
-static void *
-tiny_malloc_from_free_list(szone_t *szone, msize_t msize)
-{
- // Assumes we've locked the region
- free_list_t *ptr;
- msize_t this_msize;
- grain_t slot = msize - 1;
- free_list_t **free_list = szone->tiny_free_list;
- free_list_t **the_slot = free_list + slot;
- free_list_t *next;
- free_list_t **limit;
- unsigned bitmap;
- msize_t leftover_msize;
- free_list_t *leftover_ptr;
-
- // Assumes locked
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
-
- // Look for an exact match by checking the freelist for this msize.
- //
- ptr = *the_slot;
- if (ptr) {
- next = free_list_unchecksum_ptr(ptr->next);
- if (next) {
- next->previous = ptr->previous;
- } else {
- BITMAP32_CLR(szone->tiny_bitmap, slot);
- }
- *the_slot = next;
- this_msize = msize;
-#if DEBUG_MALLOC
- if (LOG(szone, ptr)) {
- malloc_printf("in tiny_malloc_from_free_list(), exact match ptr=%p, this_msize=%d\n", ptr, this_msize);
- }
-#endif
- goto return_tiny_alloc;
- }
-
- // Mask off the bits representing slots holding free blocks smaller than the
- // size we need. If there are no larger free blocks, try allocating from
- // the free space at the end of the tiny region.
- bitmap = szone->tiny_bitmap & ~ ((1 << slot) - 1);
- if (!bitmap)
- goto try_tiny_malloc_from_end;
-
- slot = BITMAP32_CTZ(bitmap);
- limit = free_list + NUM_TINY_SLOTS - 1;
- free_list += slot;
-
- // Iterate over freelists looking for free blocks, starting at first list
- // which is not empty, and contains blocks which are large enough to satisfy
- // our request.
- while (free_list < limit) {
- ptr = *free_list;
- if (ptr) {
- next = free_list_unchecksum_ptr(ptr->next);
- *free_list = next;
- this_msize = get_tiny_free_size(ptr);
- if (next) {
- next->previous = ptr->previous;
- } else {
- BITMAP32_CLR(szone->tiny_bitmap, this_msize - 1);
- }
- goto add_leftover_and_proceed;
- }
- free_list++;
- }
-
- // We are now looking at the last slot, which contains blocks equal to, or
- // due to coalescing of free blocks, larger than 31 * tiny quantum size.
- // If the last freelist is not empty, and the head contains a block that is
- // larger than our request, then the remainder is put back on the free list.
- ptr = *limit;
- if (ptr) {
- free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
- this_msize = get_tiny_free_size(ptr);
- next = free_list_unchecksum_ptr(ptr->next);
- if (this_msize - msize >= NUM_TINY_SLOTS) {
- // the leftover will go back to the free list, so we optimize by
- // modifying the free list rather than a pop and push of the head
- leftover_msize = this_msize - msize;
- leftover_ptr = (free_list_t *)((unsigned char *)ptr + TINY_BYTES_FOR_MSIZE(msize));
- *limit = leftover_ptr;
- if (next) {
- next->previous.u = free_list_checksum_ptr(leftover_ptr);
- }
- leftover_ptr->previous = ptr->previous;
- leftover_ptr->next = ptr->next;
- set_tiny_meta_header_free(leftover_ptr, leftover_msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in tiny_malloc_from_free_list(), last slot ptr=%p, msize=%d this_msize=%d\n", ptr, msize, this_msize);
- }
-#endif
- this_msize = msize;
- goto return_tiny_alloc;
- }
- if (next) {
- next->previous = ptr->previous;
- }
- *limit = next;
- goto add_leftover_and_proceed;
- }
-
-try_tiny_malloc_from_end:
- // Let's see if we can use szone->tiny_bytes_free_at_end
- if (szone->tiny_bytes_free_at_end >= TINY_BYTES_FOR_MSIZE(msize)) {
- ptr = (free_list_t *)(TINY_REGION_END(szone->last_tiny_region) - szone->tiny_bytes_free_at_end);
- szone->tiny_bytes_free_at_end -= TINY_BYTES_FOR_MSIZE(msize);
- if (szone->tiny_bytes_free_at_end) {
- // let's add an in use block after ptr to serve as boundary
- set_tiny_meta_header_in_use((unsigned char *)ptr + TINY_BYTES_FOR_MSIZE(msize), 1);
- }
- this_msize = msize;
-#if DEBUG_MALLOC
- if (LOG(szone, ptr)) {
- malloc_printf("in tiny_malloc_from_free_list(), from end ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- goto return_tiny_alloc;
- }
- return NULL;
-
-add_leftover_and_proceed:
- if (!this_msize || (this_msize > msize)) {
- leftover_msize = this_msize - msize;
- leftover_ptr = (free_list_t *)((unsigned char *)ptr + TINY_BYTES_FOR_MSIZE(msize));
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in tiny_malloc_from_free_list(), adding leftover ptr=%p, this_msize=%d\n", ptr, this_msize);
- }
-#endif
- tiny_free_list_add_ptr(szone, leftover_ptr, leftover_msize);
- this_msize = msize;
- }
-
-return_tiny_alloc:
- szone->num_tiny_objects++;
- szone->num_bytes_in_tiny_objects += TINY_BYTES_FOR_MSIZE(this_msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in tiny_malloc_from_free_list(), ptr=%p, this_msize=%d, msize=%d\n", ptr, this_msize, msize);
- }
-#endif
- set_tiny_meta_header_in_use(ptr, this_msize);
- return ptr;
-}
-
-static INLINE void *
-tiny_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested)
-{
- boolean_t locked = 0;
- void *ptr;
-
-#if DEBUG_MALLOC
- if (!msize) {
- szone_error(szone, "invariant broken (!msize) in allocation (region)", NULL, NULL);
- return(NULL);
- }
-#endif
-#if TINY_CACHE
- ptr = szone->last_tiny_free;
- if ((((uintptr_t)ptr) & (TINY_QUANTUM - 1)) == msize) {
- // we have a candidate - let's lock to make sure
- LOCK_AND_NOTE_LOCKED(szone, locked);
- if (ptr == szone->last_tiny_free) {
- szone->last_tiny_free = NULL;
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- ptr = (void *)((uintptr_t)ptr & ~ (TINY_QUANTUM - 1));
- if (cleared_requested) {
- memset(ptr, 0, TINY_BYTES_FOR_MSIZE(msize));
- }
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in tiny_malloc_should_clear(), tiny cache ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- return ptr;
- }
- }
-#endif
- // Except in rare occasions where we need to add a new region, we are going to end up locking, so we might as well lock right away to avoid doing unnecessary optimistic probes
- if (!locked) LOCK_AND_NOTE_LOCKED(szone, locked);
- ptr = tiny_malloc_from_free_list(szone, msize);
- if (ptr) {
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- if (cleared_requested) {
- memset(ptr, 0, TINY_BYTES_FOR_MSIZE(msize));
- }
- return ptr;
- }
- ptr = tiny_malloc_from_region_no_lock(szone, msize);
- // we don't clear because this freshly allocated space is pristine
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- return ptr;
-}
-
-static INLINE void
-free_tiny(szone_t *szone, void *ptr, region_t *tiny_region)
-{
- msize_t msize;
- boolean_t is_free;
-#if TINY_CACHE
- void *ptr2;
-#endif
-
- // ptr is known to be in tiny_region
- SZONE_LOCK(szone);
-#if TINY_CACHE
- ptr2 = szone->last_tiny_free;
- /* check that we don't already have this pointer in the cache */
- if (ptr == (void *)((uintptr_t)ptr2 & ~ (TINY_QUANTUM - 1))) {
- szone_error(szone, "double free", ptr, NULL);
- return;
- }
-#endif /* TINY_CACHE */
- msize = get_tiny_meta_header(ptr, &is_free);
- if (is_free) {
- szone_error(szone, "double free", ptr, NULL);
- return;
- }
-#if DEBUG_MALLOC
- if (!msize) {
- malloc_printf("*** szone_free() block in use is too large: %p\n", ptr);
- return;
- }
-#endif
-#if TINY_CACHE
- if (msize < TINY_QUANTUM) { // to see if the bits fit in the last 4 bits
- if ((szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) && msize)
- memset(ptr, 0x55, TINY_BYTES_FOR_MSIZE(msize));
- szone->last_tiny_free = (void *)(((uintptr_t)ptr) | msize);
- if (!ptr2) {
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- return;
- }
- msize = (uintptr_t)ptr2 & (TINY_QUANTUM - 1);
- ptr = (void *)(((uintptr_t)ptr2) & ~(TINY_QUANTUM - 1));
- tiny_region = tiny_region_for_ptr_no_lock(szone, ptr);
- if (!tiny_region) {
- szone_error(szone, "double free (tiny cache)", ptr, NULL);
- }
- }
-#endif
- tiny_free_no_lock(szone, tiny_region, ptr, msize);
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
-}
-
-static void
-print_tiny_free_list(szone_t *szone)
-{
- grain_t slot = 0;
- free_list_t *ptr;
- _SIMPLE_STRING b = _simple_salloc();
-
- if (b) {
- _simple_sappend(b, "tiny free sizes: ");
- while (slot < NUM_TINY_SLOTS) {
- ptr = szone->tiny_free_list[slot];
- if (ptr) {
- _simple_sprintf(b, "%s%y[%d]; ", (slot == NUM_TINY_SLOTS-1) ? ">=" : "", (slot+1)*TINY_QUANTUM, free_list_count(ptr));
- }
- slot++;
- }
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
- _simple_sfree(b);
- }
-}
-
-static void
-print_tiny_region(boolean_t verbose, region_t region, size_t bytes_at_end)
-{
- unsigned counts[1024];
- unsigned in_use = 0;
- uintptr_t start = (uintptr_t)TINY_REGION_ADDRESS(region);
- uintptr_t current = start;
- uintptr_t limit = (uintptr_t)TINY_REGION_END(region) - bytes_at_end;
- boolean_t is_free;
- msize_t msize;
- unsigned ci;
- _SIMPLE_STRING b;
-
- memset(counts, 0, 1024 * sizeof(unsigned));
- while (current < limit) {
- msize = get_tiny_meta_header((void *)current, &is_free);
- if (is_free & !msize && (current == start)) {
- // first block is all free
- break;
- }
- if (!msize) {
- malloc_printf("*** error with %p: msize=%d\n", (void *)current, (unsigned)msize);
- break;
- }
- if (!is_free) {
- // block in use
- if (msize > 32)
- malloc_printf("*** error at %p msize for in_use is %d\n", (void *)current, msize);
- if (msize < 1024)
- counts[msize]++;
- in_use++;
- }
- current += TINY_BYTES_FOR_MSIZE(msize);
- }
- if ((b = _simple_salloc()) != NULL) {
- _simple_sprintf(b, "Tiny region [%p-%p, %y]\t", (void *)start, TINY_REGION_END(region), (int)TINY_REGION_SIZE);
- _simple_sprintf(b, "In_use=%d ", in_use);
- if (bytes_at_end) _simple_sprintf(b, "untouched=%ly", bytes_at_end);
- if (verbose && in_use) {
- _simple_sappend(b, "\n\tSizes in use: ");
- for (ci = 0; ci < 1024; ci++)
- if (counts[ci])
- _simple_sprintf(b, "%d[%d]", TINY_BYTES_FOR_MSIZE(ci), counts[ci]);
- }
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
- _simple_sfree(b);
- }
-}
-
-static boolean_t
-tiny_free_list_check(szone_t *szone, grain_t slot)
-{
- unsigned count = 0;
- free_list_t *ptr = szone->tiny_free_list[slot];
- free_list_t *previous = NULL;
- boolean_t is_free;
-
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- while (ptr) {
- free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
- is_free = tiny_meta_header_is_free(ptr);
- if (! is_free) {
- malloc_printf("*** in-use ptr in free list slot=%d count=%d ptr=%p\n", slot, count, ptr);
- return 0;
- }
- if (((uintptr_t)ptr) & (TINY_QUANTUM - 1)) {
- malloc_printf("*** unaligned ptr in free list slot=%d count=%d ptr=%p\n", slot, count, ptr);
- return 0;
- }
- if (!tiny_region_for_ptr_no_lock(szone, ptr)) {
- malloc_printf("*** ptr not in szone slot=%d count=%d ptr=%p\n", slot, count, ptr);
- return 0;
- }
- if (free_list_unchecksum_ptr(ptr->previous) != previous) {
- malloc_printf("*** previous incorrectly set slot=%d count=%d ptr=%p\n", slot, count, ptr);
- return 0;
- }
- previous = ptr;
- ptr = free_list_unchecksum_ptr(ptr->next);
- count++;
- }
- return 1;
-}
-
-/********************* SMALL FREE LIST UTILITIES ************************/
-
-/*
- * Mark a block as free. Only the first quantum of a block is marked thusly,
- * the remainder are marked "middle".
- */
-static INLINE void
-small_meta_header_set_is_free(msize_t *meta_headers, unsigned index, msize_t msize)
-{
- meta_headers[index] = msize | SMALL_IS_FREE;
-}
-
-/*
- * Mark a block as in use. Only the first quantum of a block is marked thusly,
- * the remainder are marked "middle".
- */
-static INLINE void
-small_meta_header_set_in_use(msize_t *meta_headers, msize_t index, msize_t msize)
-{
- meta_headers[index] = msize;
-}
-
-/*
- * Mark a quantum as being the second or later in a block.
- */
-static INLINE void
-small_meta_header_set_middle(msize_t *meta_headers, msize_t index)
-{
- meta_headers[index] = 0;
-}
-
-// Adds an item to the proper free list
-// Also marks the header of the block properly
-// Assumes szone has been locked
-static void
-small_free_list_add_ptr(szone_t *szone, void *ptr, msize_t msize)
-{
- grain_t slot = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
- free_list_t *free_ptr = ptr;
- free_list_t *free_head = szone->small_free_list[slot];
- void *follower;
-
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
- }
- if (((uintptr_t)ptr) & (SMALL_QUANTUM - 1)) {
- szone_error(szone, "small_free_list_add_ptr: Unaligned ptr", ptr, NULL);
- }
-#endif
- if (free_head) {
- free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
-#if DEBUG_MALLOC
- if (free_list_unchecksum_ptr(free_head->previous)) {
- szone_error(szone, "small_free_list_add_ptr: Internal invariant broken (free_head->previous)", ptr,
- "ptr=%p slot=%d free_head=%p previous=%p\n", ptr, slot, free_head, free_head->previous.p);
- }
- if (!SMALL_PTR_IS_FREE(free_head)) {
- szone_error(szone, "small_free_list_add_ptr: Internal invariant broken (free_head is not a free pointer)", ptr,
- "ptr=%p slot=%d free_head=%p\n", ptr, slot, free_head);
- }
-#endif
- free_head->previous.u = free_list_checksum_ptr(free_ptr);
- } else {
- BITMAP32_SET(szone->small_bitmap, slot);
- }
- free_ptr->previous.p = NULL;
- free_ptr->next.p = free_head;
- free_list_set_checksum(szone, free_ptr);
- szone->small_free_list[slot] = free_ptr;
- follower = ptr + SMALL_BYTES_FOR_MSIZE(msize);
- SMALL_PREVIOUS_MSIZE(follower) = msize;
-}
-
-// Removes item in the proper free list
-// msize could be read, but all callers have it so we pass it in
-// Assumes szone has been locked
-static void
-small_free_list_remove_ptr(szone_t *szone, void *ptr, msize_t msize)
-{
- grain_t slot = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
- free_list_t *free_ptr = ptr, *next, *previous;
- free_list_checksum(szone, free_ptr, __PRETTY_FUNCTION__);
-
- next = free_list_unchecksum_ptr(free_ptr->next);
- previous = free_list_unchecksum_ptr(free_ptr->previous);
-
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("In %s, ptr=%p, msize=%d\n", __FUNCTION__, ptr, msize);
- }
-#endif
- if (!previous) {
- // The block to remove is the head of the free list
-#if DEBUG_MALLOC
- if (szone->small_free_list[slot] != ptr) {
- szone_error(szone, "small_free_list_remove_ptr: Internal invariant broken (szone->small_free_list[grain])", ptr,
- "ptr=%p slot=%d msize=%d szone->small_free_list[slot]=%p\n",
- ptr, slot, msize, szone->small_free_list[slot]);
- return;
- }
-#endif
- szone->small_free_list[slot] = next;
- if (!next) BITMAP32_CLR(szone->small_bitmap, slot);
- } else {
- // We know free_ptr is already checksummed, so we don't need to do it
- // again.
- previous->next = free_ptr->next;
- }
- if (next) {
- // We know free_ptr is already checksummed, so we don't need to do it
- // again.
- next->previous = free_ptr->previous;
- }
-}
-
-static INLINE region_t *
-small_region_for_ptr_no_lock(szone_t *szone, const void *ptr)
-{
- return hash_lookup_region_no_lock(szone->small_regions,
- szone->num_small_regions_allocated,
- SMALL_REGION_FOR_PTR(ptr));
-}
-
-static INLINE void
-small_free_no_lock(szone_t *szone, region_t *region, void *ptr, msize_t msize)
-{
- msize_t *meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
- unsigned index = SMALL_META_INDEX_FOR_PTR(ptr);
- size_t original_size = SMALL_BYTES_FOR_MSIZE(msize);
- unsigned char *next_block = ((unsigned char *)ptr + original_size);
- msize_t next_index = index + msize;
- msize_t previous_msize, next_msize;
- void *previous;
-
- // Assumes locked
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in small_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
- }
- if (! msize) {
- szone_error(szone, "trying to free small block that is too small", ptr,
- "in small_free_no_lock(), ptr=%p, msize=%d\n", ptr, msize);
- }
-#endif
- // We try to coalesce this block with the preceeding one
- if (index && (SMALL_PREVIOUS_MSIZE(ptr) <= index)) {
- previous_msize = SMALL_PREVIOUS_MSIZE(ptr);
- if (meta_headers[index - previous_msize] == (previous_msize | SMALL_IS_FREE)) {
- previous = ptr - SMALL_BYTES_FOR_MSIZE(previous_msize);
- // previous is really to be coalesced
-#if DEBUG_MALLOC
- if (LOG(szone, ptr) || LOG(szone,previous)) {
- malloc_printf("in small_free_no_lock(), coalesced backwards for %p previous=%p\n", ptr, previous);
- }
-#endif
- small_free_list_remove_ptr(szone, previous, previous_msize);
- small_meta_header_set_middle(meta_headers, index);
- ptr = previous;
- msize += previous_msize;
- index -= previous_msize;
- }
- }
- // We try to coalesce with the next block
- if ((next_block < SMALL_REGION_END(*region)) && (meta_headers[next_index] & SMALL_IS_FREE)) {
- // next block is free, we coalesce
- next_msize = meta_headers[next_index] & ~ SMALL_IS_FREE;
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) malloc_printf("In small_free_no_lock(), for ptr=%p, msize=%d coalesced next block=%p next_msize=%d\n", ptr, msize, next_block, next_msize);
-#endif
- small_free_list_remove_ptr(szone, next_block, next_msize);
- small_meta_header_set_middle(meta_headers, next_index);
- msize += next_msize;
- }
- if (szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) {
- if (!msize) {
- szone_error(szone, "incorrect size information - block header was damaged", ptr, NULL);
- } else {
- memset(ptr, 0x55, SMALL_BYTES_FOR_MSIZE(msize));
- }
- }
- small_free_list_add_ptr(szone, ptr, msize);
- small_meta_header_set_is_free(meta_headers, index, msize);
- szone->num_small_objects--;
- szone->num_bytes_in_small_objects -= original_size; // we use original_size and not msize to avoid double counting the coalesced blocks
-}
-
-static void *
-small_malloc_from_region_no_lock(szone_t *szone, msize_t msize)
-{
- void *last_block;
- void *ptr;
- void *new_address;
- msize_t *meta_headers;
- msize_t index ;
- msize_t msize_left;
-
- // Allocates from the last region or a freshly allocated region
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- // Before anything we transform the small_bytes_free_at_end - if any - to a regular free block
- if (szone->small_bytes_free_at_end) {
- last_block = (void *)(SMALL_REGION_END(szone->last_small_region) - szone->small_bytes_free_at_end);
- small_free_list_add_ptr(szone, last_block, SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end));
- *SMALL_METADATA_FOR_PTR(last_block) = SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end) | SMALL_IS_FREE;
- szone->small_bytes_free_at_end = 0;
- }
- // time to create a new region
- new_address = allocate_pages(szone, SMALL_REGION_SIZE, SMALL_BLOCKS_ALIGN,
- 0, VM_MEMORY_MALLOC_SMALL);
- if (!new_address)
- return NULL;
-
- ptr = new_address;
- meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
- index = 0;
-
- // Check to see if the hash ring of small regions needs to grow. Try to
- // avoid the hash ring becoming too dense.
- if (szone->num_small_regions_allocated < (2 * szone->num_small_regions)) {
- region_t *new_regions;
- size_t new_size;
- new_regions = hash_regions_grow_no_lock(szone, szone->small_regions,
- szone->num_small_regions_allocated,
- &new_size);
- // Do not deallocate the current small_regions allocation since someone
- // may be iterating it. Instead, just leak it.
- szone->small_regions = new_regions;
- szone->num_small_regions_allocated = new_size;
- }
- // Insert the new region into the hash ring, and update malloc statistics
- hash_region_insert_no_lock(szone->small_regions,
- szone->num_small_regions_allocated,
- new_address);
- szone->last_small_region = new_address;
-
- // we bump the number of regions AFTER we have changes the regions pointer
- // to enable finding a small region without taking the lock
- //
- // FIXME: naive assumption assumes memory ordering coherence between this
- // and other CPUs. This also applies to the near-identical code in
- // tiny_malloc_from_region_no_lock.
- szone->num_small_regions++;
- small_meta_header_set_in_use(meta_headers, index, msize);
- msize_left = NUM_SMALL_BLOCKS - index;
- szone->num_small_objects++;
- szone->num_bytes_in_small_objects += SMALL_BYTES_FOR_MSIZE(msize);
- // add a big free block
- index += msize; msize_left -= msize;
- meta_headers[index] = msize_left;
- szone->small_bytes_free_at_end = SMALL_BYTES_FOR_MSIZE(msize_left);
- return ptr;
-}
-
-static INLINE boolean_t
-try_realloc_small_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size)
-{
- // returns 1 on success
- msize_t *meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
- unsigned index = SMALL_META_INDEX_FOR_PTR(ptr);
- msize_t old_msize = SMALL_MSIZE_FOR_BYTES(old_size);
- msize_t new_msize = SMALL_MSIZE_FOR_BYTES(new_size + SMALL_QUANTUM - 1);
- void *next_block = (char *)ptr + old_size;
- unsigned next_index = index + old_msize;
- msize_t next_msize_and_free;
- msize_t next_msize;
- msize_t leftover_msize;
- void *leftover;
- unsigned leftover_index;
-
- if (next_index >= NUM_SMALL_BLOCKS) {
- return 0;
- }
-#if DEBUG_MALLOC
- if ((uintptr_t)next_block & (SMALL_QUANTUM - 1)) {
- szone_error(szone, "internal invariant broken in realloc(next_block)", next_block, NULL);
- }
- if (meta_headers[index] != old_msize)
- malloc_printf("*** try_realloc_small_in_place incorrect old %d %d\n",
- meta_headers[index], old_msize);
-#endif
- SZONE_LOCK(szone);
- /*
- * Look for a free block immediately afterwards. If it's large enough, we can consume (part of)
- * it.
- */
- next_msize_and_free = meta_headers[next_index];
- next_msize = next_msize_and_free & ~ SMALL_IS_FREE;
- if (!(next_msize_and_free & SMALL_IS_FREE) || (old_msize + next_msize < new_msize)) {
- SZONE_UNLOCK(szone);
- return 0;
- }
- /*
- * The following block is big enough; pull it from its freelist and chop off enough to satisfy
- * our needs.
- */
- small_free_list_remove_ptr(szone, next_block, next_msize);
- small_meta_header_set_middle(meta_headers, next_index);
- leftover_msize = old_msize + next_msize - new_msize;
- if (leftover_msize) {
- /* there's some left, so put the remainder back */
- leftover = (unsigned char *)ptr + SMALL_BYTES_FOR_MSIZE(new_msize);
- small_free_list_add_ptr(szone, leftover, leftover_msize);
- leftover_index = index + new_msize;
- small_meta_header_set_is_free(meta_headers, leftover_index, leftover_msize);
- }
-#if DEBUG_MALLOC
- if (SMALL_BYTES_FOR_MSIZE(new_msize) >= LARGE_THRESHOLD) {
- malloc_printf("*** realloc in place for %p exceeded msize=%d\n", new_msize);
- }
-#endif
- small_meta_header_set_in_use(meta_headers, index, new_msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in szone_realloc(), ptr=%p, msize=%d\n", ptr, *SMALL_METADATA_FOR_PTR(ptr));
- }
-#endif
- szone->num_bytes_in_small_objects += SMALL_BYTES_FOR_MSIZE(new_msize - old_msize);
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- return 1;
-}
-
-static boolean_t
-szone_check_small_region(szone_t *szone, region_t region)
-{
- unsigned char *ptr = SMALL_REGION_ADDRESS(region);
- msize_t *meta_headers = SMALL_META_HEADER_FOR_PTR(ptr);
- unsigned char *region_end = SMALL_REGION_END(region);
- msize_t prev_free = 0;
- unsigned index;
- msize_t msize_and_free;
- msize_t msize;
- free_list_t *free_head;
- void *previous, *next;
- msize_t *follower;
-
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- if (region == szone->last_small_region) region_end -= szone->small_bytes_free_at_end;
- while (ptr < region_end) {
- index = SMALL_META_INDEX_FOR_PTR(ptr);
- msize_and_free = meta_headers[index];
- if (!(msize_and_free & SMALL_IS_FREE)) {
- // block is in use
- msize = msize_and_free;
- if (!msize) {
- malloc_printf("*** invariant broken: null msize ptr=%p num_small_regions=%d end=%p\n",
- ptr, szone->num_small_regions, region_end);
- return 0;
- }
- if (msize > (LARGE_THRESHOLD / SMALL_QUANTUM)) {
- malloc_printf("*** invariant broken for %p this small msize=%d - size is too large\n",
- ptr, msize_and_free);
- return 0;
- }
- ptr += SMALL_BYTES_FOR_MSIZE(msize);
- prev_free = 0;
- } else {
- // free pointer
- msize = msize_and_free & ~ SMALL_IS_FREE;
- free_head = (free_list_t *)ptr;
- follower = (msize_t *)FOLLOWING_SMALL_PTR(ptr, msize);
- if (!msize) {
- malloc_printf("*** invariant broken for free block %p this msize=%d\n", ptr, msize);
- return 0;
- }
- if (prev_free) {
- malloc_printf("*** invariant broken for %p (2 free in a row)\n", ptr);
- return 0;
- }
- free_list_checksum(szone, free_head, __PRETTY_FUNCTION__);
- previous = free_list_unchecksum_ptr(free_head->previous);
- next = free_list_unchecksum_ptr(free_head->next);
- if (previous && !SMALL_PTR_IS_FREE(previous)) {
- malloc_printf("*** invariant broken for %p (previous %p is not a free pointer)\n",
- ptr, free_head->previous);
- return 0;
- }
- if (next && !SMALL_PTR_IS_FREE(next)) {
- malloc_printf("*** invariant broken for %p (next is not a free pointer)\n", ptr);
- return 0;
- }
- if (SMALL_PREVIOUS_MSIZE(follower) != msize) {
- malloc_printf("*** invariant broken for small free %p followed by %p in region [%p-%p] "
- "(end marker incorrect) should be %d; in fact %d\n",
- ptr, follower, SMALL_REGION_ADDRESS(region), region_end, msize, SMALL_PREVIOUS_MSIZE(follower));
- return 0;
- }
- ptr = (unsigned char *)follower;
- prev_free = SMALL_IS_FREE;
- }
- }
- return 1;
-}
-
-static kern_return_t
-small_in_use_enumerator(task_t task, void *context, unsigned type_mask, szone_t *szone, memory_reader_t reader, vm_range_recorder_t recorder)
-{
- size_t num_regions = szone->num_small_regions_allocated;
- void *last_small_free = szone->last_small_free;
- size_t index;
- region_t *regions;
- vm_range_t buffer[MAX_RECORDER_BUFFER];
- unsigned count = 0;
- kern_return_t err;
- region_t region;
- vm_range_t range;
- vm_range_t admin_range;
- vm_range_t ptr_range;
- unsigned char *mapped_region;
- msize_t *block_header;
- unsigned block_index;
- unsigned block_limit;
- msize_t msize_and_free;
- msize_t msize;
- vm_address_t last_small_free_ptr = 0;
- msize_t last_small_free_msize = 0;
-
- if (last_small_free) {
- last_small_free_ptr = (uintptr_t)last_small_free & ~(SMALL_QUANTUM - 1);
- last_small_free_msize = (uintptr_t)last_small_free & (SMALL_QUANTUM - 1);
- }
-
- err = reader(task, (vm_address_t)szone->small_regions, sizeof(region_t) * num_regions, (void **)®ions);
- if (err) return err;
- for (index = 0; index < num_regions; ++index) {
- region = regions[index];
- if (region) {
- range.address = (vm_address_t)SMALL_REGION_ADDRESS(region);
- range.size = SMALL_REGION_SIZE;
- if (type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) {
- admin_range.address = range.address + SMALL_HEADER_START;
- admin_range.size = SMALL_ARRAY_SIZE;
- recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &admin_range, 1);
- }
- if (type_mask & (MALLOC_PTR_REGION_RANGE_TYPE | MALLOC_ADMIN_REGION_RANGE_TYPE)) {
- ptr_range.address = range.address;
- ptr_range.size = NUM_SMALL_BLOCKS * SMALL_QUANTUM;
- recorder(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &ptr_range, 1);
- }
- if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
- err = reader(task, range.address, range.size, (void **)&mapped_region);
- if (err) return err;
- block_header = (msize_t *)(mapped_region + SMALL_HEADER_START);
- block_index = 0;
- block_limit = NUM_SMALL_BLOCKS;
- if (region == szone->last_small_region)
- block_limit -= SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end);
- while (block_index < block_limit) {
- msize_and_free = block_header[block_index];
- msize = msize_and_free & ~ SMALL_IS_FREE;
- if (! (msize_and_free & SMALL_IS_FREE) &&
- range.address + SMALL_BYTES_FOR_MSIZE(block_index) != last_small_free_ptr) {
- // Block in use
- buffer[count].address = range.address + SMALL_BYTES_FOR_MSIZE(block_index);
- buffer[count].size = SMALL_BYTES_FOR_MSIZE(msize);
- count++;
- if (count >= MAX_RECORDER_BUFFER) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- count = 0;
- }
- }
- block_index += msize;
- }
- }
- }
- }
- if (count) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- }
- return 0;
-}
-
-static void *
-small_malloc_from_free_list(szone_t *szone, msize_t msize)
-{
- free_list_t *ptr;
- msize_t this_msize;
- grain_t slot = (msize <= NUM_SMALL_SLOTS) ? msize - 1 : NUM_SMALL_SLOTS - 1;
- free_list_t **free_list = szone->small_free_list;
- free_list_t *next;
- free_list_t **limit;
- unsigned bitmap = szone->small_bitmap & ~ ((1 << slot) - 1);
- msize_t leftover_msize;
- free_list_t *leftover_ptr;
- msize_t *meta_headers;
- unsigned leftover_index;
-
- // Assumes locked
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
-
- // Mask off the bits representing slots holding free blocks smaller than the
- // size we need. If there are no larger free blocks, try allocating from
- // the free space at the end of the tiny region.
- if (!bitmap)
- goto try_small_from_end;
-
- slot = BITMAP32_CTZ(bitmap);
- limit = free_list + NUM_SMALL_SLOTS - 1;
- free_list += slot;
-
- // Iterate over freelists looking for free blocks, starting at first list
- // which is not empty, and contains blocks which are large enough to satisfy
- // our request.
- while (free_list < limit) {
- ptr = *free_list;
- if (ptr) {
- next = free_list_unchecksum_ptr(ptr->next);
- *free_list = next;
- this_msize = SMALL_PTR_SIZE(ptr);
- if (next) {
- next->previous = ptr->previous;
- } else {
- BITMAP32_CLR(szone->small_bitmap, this_msize - 1);
- }
- goto add_leftover_and_proceed;
- }
- free_list++;
- }
-
- // We are now looking at the last slot, which contains blocks equal to, or
- // due to coalescing of free blocks, larger than 31 * small quantum size.
- // If the last freelist is not empty, and the head contains a block that is
- // larger than our request, then the remainder is put back on the free list.
- //
- // FIXME: This code doesn't have the optimization from the 'tiny' codepath
- // that optimizes for the this_msize >= 2 * num slots
- // FIXME: this code also seems somewhat bogus. There's a check for
- // this_msize >= msize, but by definition we can't ask for a small
- // block larger than 31 small quanta, and every free block in this
- // slot has to be at least that large.
- ptr = *limit;
- while (ptr) {
- free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
- next = free_list_unchecksum_ptr(ptr->next);
- this_msize = SMALL_PTR_SIZE(ptr);
- if (this_msize >= msize) {
- small_free_list_remove_ptr(szone, ptr, this_msize);
- goto add_leftover_and_proceed;
- }
- ptr = next;
- }
-
-try_small_from_end:
- // Let's see if we can use szone->small_bytes_free_at_end
- if (szone->small_bytes_free_at_end >= SMALL_BYTES_FOR_MSIZE(msize)) {
- ptr = (free_list_t *)(SMALL_REGION_END(szone->last_small_region) - szone->small_bytes_free_at_end);
- szone->small_bytes_free_at_end -= SMALL_BYTES_FOR_MSIZE(msize);
- if (szone->small_bytes_free_at_end) {
- // let's mark this block as in use to serve as boundary
- *SMALL_METADATA_FOR_PTR((unsigned char *)ptr + SMALL_BYTES_FOR_MSIZE(msize)) = SMALL_MSIZE_FOR_BYTES(szone->small_bytes_free_at_end);
- }
- this_msize = msize;
- goto return_small_alloc;
- }
- return NULL;
-
-add_leftover_and_proceed:
- if (this_msize > msize) {
- leftover_msize = this_msize - msize;
- leftover_ptr = (free_list_t *)((unsigned char *)ptr + SMALL_BYTES_FOR_MSIZE(msize));
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in small_malloc_from_free_list(), adding leftover ptr=%p, this_msize=%d\n", ptr, this_msize);
- }
-#endif
- small_free_list_add_ptr(szone, leftover_ptr, leftover_msize);
- meta_headers = SMALL_META_HEADER_FOR_PTR(leftover_ptr);
- leftover_index = SMALL_META_INDEX_FOR_PTR(leftover_ptr);
- small_meta_header_set_is_free(meta_headers, leftover_index, leftover_msize);
- this_msize = msize;
- }
-
-return_small_alloc:
- szone->num_small_objects++;
- szone->num_bytes_in_small_objects += SMALL_BYTES_FOR_MSIZE(this_msize);
-#if DEBUG_MALLOC
- if (LOG(szone,ptr)) {
- malloc_printf("in small_malloc_from_free_list(), ptr=%p, this_msize=%d, msize=%d\n", ptr, this_msize, msize);
- }
-#endif
- *SMALL_METADATA_FOR_PTR(ptr) = this_msize;
- return ptr;
-}
-
-static INLINE void *
-small_malloc_should_clear(szone_t *szone, msize_t msize, boolean_t cleared_requested)
-{
- boolean_t locked = 0;
-#if SMALL_CACHE
- void *ptr;
-#endif
-
-#if SMALL_CACHE
- ptr = (void *)szone->last_small_free;
- if ((((uintptr_t)ptr) & (SMALL_QUANTUM - 1)) == msize) {
- // we have a candidate - let's lock to make sure
- LOCK_AND_NOTE_LOCKED(szone, locked);
- if (ptr == (void *)szone->last_small_free) {
- szone->last_small_free = NULL;
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- ptr = (void *)((uintptr_t)ptr & ~ (SMALL_QUANTUM - 1));
- if (cleared_requested) {
- memset(ptr, 0, SMALL_BYTES_FOR_MSIZE(msize));
- }
- return ptr;
- }
- }
-#endif
- // Except in rare occasions where we need to add a new region, we are going to end up locking,
- // so we might as well lock right away to avoid doing unnecessary optimistic probes
- if (!locked) LOCK_AND_NOTE_LOCKED(szone, locked);
- ptr = small_malloc_from_free_list(szone, msize);
- if (ptr) {
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- if (cleared_requested) {
- memset(ptr, 0, SMALL_BYTES_FOR_MSIZE(msize));
- }
- return ptr;
- }
- ptr = small_malloc_from_region_no_lock(szone, msize);
- // we don't clear because this freshly allocated space is pristine
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- return ptr;
-}
-
-// tries to allocate a small, cleared block
-static INLINE void *
-small_malloc_cleared_no_lock(szone_t *szone, msize_t msize)
-{
- void *ptr;
-
- // Assumes already locked
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- ptr = small_malloc_from_free_list(szone, msize);
- if (ptr) {
- memset(ptr, 0, SMALL_BYTES_FOR_MSIZE(msize));
- return ptr;
- } else {
- ptr = small_malloc_from_region_no_lock(szone, msize);
- // we don't clear because this freshly allocated space is pristine
- }
- return ptr;
-}
-
-static INLINE void
-free_small(szone_t *szone, void *ptr, region_t *small_region)
-{
- msize_t msize = SMALL_PTR_SIZE(ptr);
-#if SMALL_CACHE
- void *ptr2;
-#endif
-
- // ptr is known to be in small_region
- SZONE_LOCK(szone);
-#if SMALL_CACHE
- ptr2 = szone->last_small_free;
- /* check that we don't already have this pointer in the cache */
- if (ptr == (void *)((uintptr_t)ptr2 & ~ (SMALL_QUANTUM - 1))) {
- szone_error(szone, "double free", ptr, NULL);
- return;
- }
-#endif
- if (SMALL_PTR_IS_FREE(ptr)) {
- szone_error(szone, "double free", ptr, NULL);
- return;
- }
-#if SMALL_CACHE
- szone->last_small_free = (void *)(((uintptr_t)ptr) | msize);
- if (!ptr2) {
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- return;
- }
- msize = (uintptr_t)ptr2 & (SMALL_QUANTUM - 1);
- ptr = (void *)(((uintptr_t)ptr2) & ~ (SMALL_QUANTUM - 1));
- small_region = small_region_for_ptr_no_lock(szone, ptr);
- if (!small_region) {
- szone_error(szone, "double free (small cache)", ptr, NULL);
- return;
- }
-#endif
- small_free_no_lock(szone, small_region, ptr, msize);
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
-}
-
-static void
-print_small_free_list(szone_t *szone)
-{
- grain_t grain = 0;
- free_list_t *ptr;
- _SIMPLE_STRING b = _simple_salloc();
-
- if (b) {
- _simple_sappend(b, "small free sizes: ");
- while (grain < NUM_SMALL_SLOTS) {
- ptr = szone->small_free_list[grain];
- if (ptr) {
- _simple_sprintf(b, "%s%y[%d]; ", (grain == NUM_SMALL_SLOTS-1) ? ">=" : "", (grain + 1) * SMALL_QUANTUM, free_list_count(ptr));
- }
- grain++;
- }
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
- _simple_sfree(b);
- }
-}
-
-static void
-print_small_region(szone_t *szone, boolean_t verbose, region_t region, size_t bytes_at_end)
-{
- unsigned counts[1024];
- unsigned in_use = 0;
- void *start = SMALL_REGION_ADDRESS(region);
- void *limit = SMALL_REGION_END(region) - bytes_at_end;
- msize_t msize_and_free;
- msize_t msize;
- unsigned ci;
- _SIMPLE_STRING b;
-
- memset(counts, 0, 1024 * sizeof(unsigned));
- while (start < limit) {
- msize_and_free = *SMALL_METADATA_FOR_PTR(start);
- msize = msize_and_free & ~ SMALL_IS_FREE;
- if (!(msize_and_free & SMALL_IS_FREE)) {
- // block in use
- if (msize < 1024)
- counts[msize]++;
- in_use++;
- }
- start += SMALL_BYTES_FOR_MSIZE(msize);
- }
- if ((b = _simple_salloc()) != NULL) {
- _simple_sprintf(b, "Small region [%p-%p, %y]\tIn_use=%d ",
- SMALL_REGION_ADDRESS(region), SMALL_REGION_END(region), (int)SMALL_REGION_SIZE, in_use);
- if (bytes_at_end)
- _simple_sprintf(b, "Untouched=%ly", bytes_at_end);
- if (verbose && in_use) {
- _simple_sappend(b, "\n\tSizes in use: ");
- for (ci = 0; ci < 1024; ci++)
- if (counts[ci])
- _simple_sprintf(b, "%d[%d] ", SMALL_BYTES_FOR_MSIZE(ci), counts[ci]);
- }
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
- _simple_sfree(b);
- }
-}
-
-static boolean_t
-small_free_list_check(szone_t *szone, grain_t grain)
-{
- unsigned count = 0;
- free_list_t *ptr = szone->small_free_list[grain];
- free_list_t *previous = NULL;
- msize_t msize_and_free;
-
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
- while (ptr) {
- msize_and_free = *SMALL_METADATA_FOR_PTR(ptr);
- count++;
- if (!(msize_and_free & SMALL_IS_FREE)) {
- malloc_printf("*** in-use ptr in free list grain=%d count=%d ptr=%p\n", grain, count, ptr);
- return 0;
- }
- if (((uintptr_t)ptr) & (SMALL_QUANTUM - 1)) {
- malloc_printf("*** unaligned ptr in free list grain=%d count=%d ptr=%p\n", grain, count, ptr);
- return 0;
- }
- if (!small_region_for_ptr_no_lock(szone, ptr)) {
- malloc_printf("*** ptr not in szone grain=%d count=%d ptr=%p\n", grain, count, ptr);
- return 0;
- }
- free_list_checksum(szone, ptr, __PRETTY_FUNCTION__);
- if (free_list_unchecksum_ptr(ptr->previous) != previous) {
- malloc_printf("*** previous incorrectly set grain=%d count=%d ptr=%p\n", grain, count, ptr);
- return 0;
- }
- previous = ptr;
- ptr = free_list_unchecksum_ptr(ptr->next);
- }
- return 1;
-}
-
-/*******************************************************************************
- * Region hash implementation
- *
- * This is essentially a duplicate of the existing Large allocator hash, minus
- * the ability to remove entries. The two should be combined eventually.
- ******************************************************************************/
-#pragma mark region hash
-
-/*
- * hash_lookup_region_no_lock - Scan a hash ring looking for an entry for a
- * given region.
- *
- * FIXME: If consecutive queries of the same region are likely, a one-entry
- * cache would likely be a significant performance win here.
- */
-static region_t *
-hash_lookup_region_no_lock(region_t *regions, size_t num_entries, region_t r) {
- size_t index, hash_index;
- region_t *entry;
-
- if (!num_entries)
- return 0;
-
- index = hash_index = ((uintptr_t)r >> 20) % num_entries;
- do {
- entry = regions + index;
- if (*entry == 0)
- return 0;
- if (*entry == r)
- return entry;
- if (++index == num_entries)
- index = 0;
- } while (index != hash_index);
- return 0;
-}
-
-/*
- * hash_region_insert_no_lock - Insert a region into the hash ring.
- */
-static void
-hash_region_insert_no_lock(region_t *regions, size_t num_entries, region_t r) {
- size_t index, hash_index;
- region_t *entry;
-
- index = hash_index = ((uintptr_t)r >> 20) % num_entries;
- do {
- entry = regions + index;
- if (*entry == 0) {
- *entry = r;
- return;
- }
- if (++index == num_entries)
- index = 0;
- } while (index != hash_index);
-}
-
-/*
- * hash_regions_alloc_no_lock - Allocate space for a number of entries. This
- * must be a VM allocation as to avoid recursing between allocating a new small
- * region, and asking the small region to allocate space for the new list of
- * regions.
- */
-static region_t *
-hash_regions_alloc_no_lock(szone_t *szone, size_t num_entries)
-{
- size_t size = num_entries * sizeof(region_t);
- return allocate_pages(szone, round_page(size), 0, 0, VM_MEMORY_MALLOC);
-}
-
-/*
- * hash_regions_grow_no_lock - Grow the hash ring, and rehash the entries.
- * Return the new region and new size to update the szone. Do not deallocate
- * the old entries since someone may still be allocating them.
- */
-static region_t *
-hash_regions_grow_no_lock(szone_t *szone, region_t *regions, size_t old_size,
- size_t *new_size)
-{
- // double in size and allocate memory for the regions
- *new_size = old_size * 2 + 1;
- region_t *new_regions = hash_regions_alloc_no_lock(szone, *new_size);
-
- // rehash the entries into the new list
- size_t index;
- for (index = 0; index < old_size; ++index) {
- region_t r = regions[index];
- if (r != 0)
- hash_region_insert_no_lock(new_regions, *new_size, r);
- }
- return new_regions;
-}
-
-/*******************************************************************************
- * Large allocator implementation
- ******************************************************************************/
-#pragma mark large allocator
-
-#if DEBUG_MALLOC
-
-static void
-large_debug_print(szone_t *szone)
-{
- unsigned num_large_entries = szone->num_large_entries;
- unsigned index = num_large_entries;
- large_entry_t *range;
- _SIMPLE_STRING b = _simple_salloc();
-
- if (b) {
- for (index = 0, range = szone->large_entries; index < szone->num_large_entries; index++, range++)
- if (!LARGE_ENTRY_IS_EMPTY(*range))
- _simple_sprintf(b, "%d: %p(%y); ", index, LARGE_ENTRY_ADDRESS(*range), LARGE_ENTRY_SIZE(*range));
-
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "%s\n", _simple_string(b));
- _simple_sfree(b);
- }
-}
-#endif
-
-/*
- * Scan the hash ring looking for an entry for the given pointer.
- */
-static large_entry_t *
-large_entry_for_pointer_no_lock(szone_t *szone, const void *ptr)
-{
- // result only valid with lock held
- unsigned num_large_entries = szone->num_large_entries;
- unsigned hash_index;
- unsigned index;
- large_entry_t *range;
-
- if (!num_large_entries)
- return NULL;
- hash_index = ((uintptr_t)ptr >> vm_page_shift) % num_large_entries;
- index = hash_index;
- do {
- range = szone->large_entries + index;
- if (LARGE_ENTRY_MATCHES(*range, ptr))
- return range;
- if (LARGE_ENTRY_IS_EMPTY(*range))
- return NULL; // end of chain
- index++;
- if (index == num_large_entries)
- index = 0;
- } while (index != hash_index);
- return NULL;
-}
-
-static void
-large_entry_insert_no_lock(szone_t *szone, large_entry_t range)
-{
- unsigned num_large_entries = szone->num_large_entries;
- unsigned hash_index = (range.address_and_num_pages >> vm_page_shift) % num_large_entries;
- unsigned index = hash_index;
- large_entry_t *entry;
-
- do {
- entry = szone->large_entries + index;
- if (LARGE_ENTRY_IS_EMPTY(*entry)) {
- *entry = range;
- return; // end of chain
- }
- index++;
- if (index == num_large_entries)
- index = 0;
- } while (index != hash_index);
-}
-
-static INLINE void
-large_entries_rehash_after_entry_no_lock(szone_t *szone, large_entry_t *entry)
-{
- unsigned num_large_entries = szone->num_large_entries;
- unsigned hash_index = entry - szone->large_entries;
- unsigned index = hash_index;
- large_entry_t range;
-
- do {
- index++;
- if (index == num_large_entries)
- index = 0;
- range = szone->large_entries[index];
- if (LARGE_ENTRY_IS_EMPTY(range))
- return;
- szone->large_entries[index].address_and_num_pages = 0;
- large_entry_insert_no_lock(szone, range); // this will reinsert in the
- // proper place
- } while (index != hash_index);
-}
-
-static INLINE large_entry_t *
-large_entries_alloc_no_lock(szone_t *szone, unsigned num)
-{
- size_t size = num * sizeof(large_entry_t);
- boolean_t is_vm_allocation = size >= LARGE_THRESHOLD;
-
- if (is_vm_allocation) {
- // Note that we allocate memory (via a system call) under a spin lock
- // That is certainly evil, however it's very rare in the lifetime of a process
- // The alternative would slow down the normal case
- return allocate_pages(szone, round_page(size), 0, 0, VM_MEMORY_MALLOC_LARGE);
- } else {
- return small_malloc_cleared_no_lock(szone, SMALL_MSIZE_FOR_BYTES(size + SMALL_QUANTUM - 1));
- }
-}
-
-static void
-large_entries_free_no_lock(szone_t *szone, large_entry_t *entries, unsigned num, vm_range_t *range_to_deallocate)
-{
- // returns range to deallocate
- size_t size = num * sizeof(large_entry_t);
- boolean_t is_vm_allocation = size >= LARGE_THRESHOLD;
- region_t *region;
- msize_t msize_and_free;
-
- if (is_vm_allocation) {
- range_to_deallocate->address = (vm_address_t)entries;
- range_to_deallocate->size = round_page(size);
- } else {
- range_to_deallocate->size = 0;
- region = small_region_for_ptr_no_lock(szone, entries);
- msize_and_free = *SMALL_METADATA_FOR_PTR(entries);
- if (msize_and_free & SMALL_IS_FREE) {
- szone_error(szone, "object already freed being freed", entries, NULL);
- return;
- }
- small_free_no_lock(szone, region, entries, msize_and_free);
- }
-}
-
-static large_entry_t *
-large_entries_grow_no_lock(szone_t *szone, vm_range_t *range_to_deallocate)
-{
- // sets range_to_deallocate
- unsigned old_num_entries = szone->num_large_entries;
- large_entry_t *old_entries = szone->large_entries;
- unsigned new_num_entries = (old_num_entries) ? old_num_entries * 2 + 1 : 63; // always an odd number for good hashing
- large_entry_t *new_entries = large_entries_alloc_no_lock(szone, new_num_entries);
- unsigned index = old_num_entries;
- large_entry_t oldRange;
-
- // if the allocation of new entries failed, bail
- if (new_entries == NULL)
- return NULL;
-
- szone->num_large_entries = new_num_entries;
- szone->large_entries = new_entries;
-
- /* rehash entries into the new list */
- while (index--) {
- oldRange = old_entries[index];
- if (!LARGE_ENTRY_IS_EMPTY(oldRange)) {
- large_entry_insert_no_lock(szone, oldRange);
- }
- }
- if (old_entries) {
- large_entries_free_no_lock(szone, old_entries, old_num_entries, range_to_deallocate);
- } else {
- range_to_deallocate->size = 0;
- }
- return new_entries;
-}
-
-// frees the specific entry in the size table
-// returns a range to truly deallocate
-static vm_range_t
-large_free_no_lock(szone_t *szone, large_entry_t *entry)
-{
- vm_range_t range;
-
- range.address = (vm_address_t)LARGE_ENTRY_ADDRESS(*entry);
- range.size = (vm_size_t)LARGE_ENTRY_SIZE(*entry);
- szone->num_large_objects_in_use--;
- szone->num_bytes_in_large_objects -= range.size;
- if (szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) {
- protect((void *)range.address, range.size, VM_PROT_READ | VM_PROT_WRITE, szone->debug_flags);
- range.address -= vm_page_size;
- range.size += 2 * vm_page_size;
- }
- entry->address_and_num_pages = 0;
- large_entries_rehash_after_entry_no_lock(szone, entry);
-#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone, (void *)range.address)) {
- malloc_printf("*** freed entry %p still in use; num_large_entries=%d\n",
- range.address, szone->num_large_entries);
- large_debug_print(szone);
- szone_sleep();
- }
-#endif
- return range;
-}
-
-static kern_return_t
-large_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t large_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder)
-{
- unsigned index = 0;
- vm_range_t buffer[MAX_RECORDER_BUFFER];
- unsigned count = 0;
- large_entry_t *entries;
- kern_return_t err;
- vm_range_t range;
- large_entry_t entry;
-
- err = reader(task, large_entries_address, sizeof(large_entry_t) * num_entries, (void **)&entries);
- if (err)
- return err;
- index = num_entries;
- if ((type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) &&
- (num_entries * sizeof(large_entry_t) >= LARGE_THRESHOLD)) {
- range.address = large_entries_address;
- range.size = round_page(num_entries * sizeof(large_entry_t));
- recorder(task, context, MALLOC_ADMIN_REGION_RANGE_TYPE, &range, 1);
- }
- if (type_mask & (MALLOC_PTR_IN_USE_RANGE_TYPE | MALLOC_PTR_REGION_RANGE_TYPE))
- while (index--) {
- entry = entries[index];
- if (!LARGE_ENTRY_IS_EMPTY(entry)) {
- range.address = (vm_address_t)LARGE_ENTRY_ADDRESS(entry);
- range.size = (vm_size_t)LARGE_ENTRY_SIZE(entry);
- buffer[count++] = range;
- if (count >= MAX_RECORDER_BUFFER) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE | MALLOC_PTR_REGION_RANGE_TYPE, buffer, count);
- count = 0;
- }
- }
- }
- if (count) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE
- | MALLOC_PTR_REGION_RANGE_TYPE, buffer, count);
- }
- return 0;
-}
-
-/********************* HUGE ENTRY UTILITIES ************************/
-
-static huge_entry_t *
-huge_entry_for_pointer_no_lock(szone_t *szone, const void *ptr)
-{
- unsigned index;
- huge_entry_t *huge;
-
- for (index = szone->num_huge_entries, huge = szone->huge_entries;
- index > 0;
- index--, huge++) {
-
- if ((void *)huge->address == ptr)
- return huge;
- }
- return NULL;
-}
-
-static boolean_t
-huge_entry_append(szone_t *szone, huge_entry_t huge)
-{
- huge_entry_t *new_huge_entries = NULL, *old_huge_entries;
- unsigned num_huge_entries;
-
- // We do a little dance with locking because doing allocation (even in the
- // default szone) may cause something to get freed in this szone, with a
- // deadlock
- // Returns 1 on success
- SZONE_LOCK(szone);
- for (;;) {
- num_huge_entries = szone->num_huge_entries;
- SZONE_UNLOCK(szone);
- /* check for counter wrap */
- if ((num_huge_entries + 1) < num_huge_entries)
- return 0;
- /* stale allocation from last time around the loop? */
- if (new_huge_entries)
- szone_free(szone, new_huge_entries);
- new_huge_entries = szone_malloc(szone, (num_huge_entries + 1) * sizeof(huge_entry_t));
- if (new_huge_entries == NULL)
- return 0;
- SZONE_LOCK(szone);
- if (num_huge_entries == szone->num_huge_entries) {
- // No change - our malloc still applies
- old_huge_entries = szone->huge_entries;
- if (num_huge_entries) {
- memcpy(new_huge_entries, old_huge_entries, num_huge_entries * sizeof(huge_entry_t));
- }
- new_huge_entries[szone->num_huge_entries++] = huge;
- szone->huge_entries = new_huge_entries;
- SZONE_UNLOCK(szone);
- szone_free(szone, old_huge_entries);
- return 1;
- }
- // try again!
- }
-}
-
-static kern_return_t
-huge_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t huge_entries_address, unsigned num_entries, memory_reader_t reader, vm_range_recorder_t recorder)
-{
- huge_entry_t *entries;
- kern_return_t err;
-
- err = reader(task, huge_entries_address, sizeof(huge_entry_t) * num_entries, (void **)&entries);
- if (err)
- return err;
- if (num_entries)
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE | MALLOC_PTR_REGION_RANGE_TYPE, entries, num_entries);
-
- return 0;
-}
-
-static void *
-large_and_huge_malloc(szone_t *szone, size_t num_pages)
-{
- void *addr;
- vm_range_t range_to_deallocate;
- huge_entry_t huge_entry;
- size_t size;
- large_entry_t large_entry;
-
- if (!num_pages)
- num_pages = 1; // minimal allocation size for this szone
- size = (size_t)num_pages << vm_page_shift;
- range_to_deallocate.size = 0;
- if (num_pages >= (1 << vm_page_shift)) {
- addr = allocate_pages(szone, size, 0, szone->debug_flags, VM_MEMORY_MALLOC_HUGE);
- if (addr == NULL)
- return NULL;
- huge_entry.size = size;
- huge_entry.address = (vm_address_t)addr;
- if (!huge_entry_append(szone, huge_entry))
- return NULL; // we are leaking the allocation here
- SZONE_LOCK(szone);
- szone->num_bytes_in_huge_objects += size;
- } else {
-
- addr = allocate_pages(szone, size, 0, szone->debug_flags, VM_MEMORY_MALLOC_LARGE);
-#if DEBUG_MALLOC
- if (LOG(szone, addr))
- malloc_printf("in szone_malloc true large allocation at %p for %ly\n", (void *)addr, size);
-#endif
- SZONE_LOCK(szone);
- if (addr == NULL) {
- SZONE_UNLOCK(szone);
- return NULL;
- }
-#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone, addr)) {
- malloc_printf("freshly allocated is already in use: %p\n", addr);
- large_debug_print(szone);
- szone_sleep();
- }
-#endif
- if ((szone->num_large_objects_in_use + 1) * 4 > szone->num_large_entries) {
- // density of hash table too high; grow table
- // we do that under lock to avoid a race
- large_entry_t *entries = large_entries_grow_no_lock(szone, &range_to_deallocate);
- if (entries == NULL) {
- SZONE_UNLOCK(szone);
- return NULL;
- }
- }
- large_entry.address_and_num_pages = (uintptr_t)addr | num_pages;
-#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone, addr)) {
- malloc_printf("entry about to be added already in use: %p\n", addr);
- large_debug_print(szone);
- szone_sleep();
- }
-#endif
- large_entry_insert_no_lock(szone, large_entry);
-#if DEBUG_MALLOC
- if (!large_entry_for_pointer_no_lock(szone, (void *)addr)) {
- malloc_printf("can't find entry just added\n");
- large_debug_print(szone);
- szone_sleep();
- }
-#endif
- szone->num_large_objects_in_use ++;
- szone->num_bytes_in_large_objects += size;
- }
- SZONE_UNLOCK(szone);
- if (range_to_deallocate.size) {
- deallocate_pages(szone, (void *)range_to_deallocate.address, range_to_deallocate.size, 0); // we deallocate outside the lock
- }
- return (void *)addr;
-}
-
-static INLINE void
-free_large_or_huge(szone_t *szone, void *ptr)
-{
- // We have established ptr is page-aligned and not tiny nor small
- large_entry_t *entry;
- vm_range_t vm_range_to_deallocate;
- huge_entry_t *huge;
-
- SZONE_LOCK(szone);
- entry = large_entry_for_pointer_no_lock(szone, ptr);
- if (entry) {
- vm_range_to_deallocate = large_free_no_lock(szone, entry);
-#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone, ptr)) {
- malloc_printf("*** just after freeing %p still in use num_large_entries=%d\n", ptr, szone->num_large_entries);
- large_debug_print(szone);
- szone_sleep();
- }
-#endif
- } else if ((huge = huge_entry_for_pointer_no_lock(szone, ptr))) {
- vm_range_to_deallocate = *huge;
- *huge = szone->huge_entries[--szone->num_huge_entries]; // last entry fills that spot
- szone->num_bytes_in_huge_objects -= (size_t)vm_range_to_deallocate.size;
- } else {
-#if DEBUG_MALLOC
- large_debug_print(szone);
-#endif
- szone_error(szone, "pointer being freed was not allocated", ptr, NULL);
- return;
- }
- SZONE_UNLOCK(szone); // we release the lock asap
- CHECK(szone, __PRETTY_FUNCTION__);
- // we deallocate_pages, including guard pages
- if (vm_range_to_deallocate.address) {
-#if DEBUG_MALLOC
- if (large_entry_for_pointer_no_lock(szone, (void *)vm_range_to_deallocate.address)) {
- malloc_printf("*** invariant broken: %p still in use num_large_entries=%d\n", vm_range_to_deallocate.address, szone->num_large_entries);
- large_debug_print(szone);
- szone_sleep();
- }
-#endif
- deallocate_pages(szone, (void *)vm_range_to_deallocate.address, (size_t)vm_range_to_deallocate.size, 0);
- }
-}
-
-static INLINE int
-try_realloc_large_or_huge_in_place(szone_t *szone, void *ptr, size_t old_size, size_t new_size)
-{
- vm_address_t addr = (vm_address_t)ptr + old_size;
- large_entry_t *large_entry, saved_entry;
- huge_entry_t *huge_entry, huge;
- kern_return_t err;
-
-#if DEBUG_MALLOC
- if (old_size != ((old_size >> vm_page_shift) << vm_page_shift)) {
- malloc_printf("*** old_size is %d\n", old_size);
- }
-#endif
- SZONE_LOCK(szone);
- large_entry = large_entry_for_pointer_no_lock(szone, (void *)addr);
- SZONE_UNLOCK(szone);
- if (large_entry) {
- return 0; // large pointer already exists in table - extension is not going to work
- }
- new_size = round_page(new_size);
- /*
- * Ask for allocation at a specific address, and mark as realloc
- * to request coalescing with previous realloc'ed extensions.
- */
- err = vm_allocate(mach_task_self(), &addr, new_size - old_size, VM_MAKE_TAG(VM_MEMORY_REALLOC));
- if (err != KERN_SUCCESS) {
- return 0;
- }
- SZONE_LOCK(szone);
- /*
- * If the new size is still under the large/huge threshold, we can just
- * extend the existing large block.
- *
- * Note: this logic is predicated on the understanding that an allocated
- * block can never really shrink, so that the new size will always be
- * larger than the old size.
- *
- * Note: the use of 1 << vm_page_shift here has to do with the subdivision
- * of the bits in the large_entry_t, and not the size of a page (directly).
- */
- if ((new_size >> vm_page_shift) < (1 << vm_page_shift)) {
- /* extend existing large entry */
- large_entry = large_entry_for_pointer_no_lock(szone, ptr);
- if (!large_entry) {
- szone_error(szone, "large entry reallocated is not properly in table", ptr, NULL);
- /* XXX will cause fault on next reference to entry */
- }
- large_entry->address_and_num_pages = (uintptr_t)ptr | (new_size >> vm_page_shift);
- szone->num_bytes_in_large_objects += new_size - old_size;
- } else if ((old_size >> vm_page_shift) >= (1 << vm_page_shift)) {
- /* extend existing huge entry */
- huge_entry = huge_entry_for_pointer_no_lock(szone, ptr);
- if (!huge_entry) {
- szone_error(szone, "huge entry reallocated is not properly in table", ptr, NULL);
- /* XXX will cause fault on next reference to huge_entry */
- }
- huge_entry->size = new_size;
- szone->num_bytes_in_huge_objects += new_size - old_size;
- } else {
- /* need to convert large entry to huge entry */
-
- /* release large entry, note we still have the VM allocation */
- large_entry = large_entry_for_pointer_no_lock(szone, ptr);
- saved_entry = *large_entry; // in case we need to put it back
- large_free_no_lock(szone, large_entry);
-
- /* and get a huge entry */
- huge.address = (vm_address_t)ptr;
- huge.size = new_size; /* fix up size */
- SZONE_UNLOCK(szone);
- if (huge_entry_append(szone, huge)) {
- szone->num_bytes_in_huge_objects += new_size;
- return 1; // success!
- }
- SZONE_LOCK(szone);
- // we leak memory (the extra space appended) but data structures are correct
- large_entry_insert_no_lock(szone, saved_entry); // this will reinsert the large entry
- }
- SZONE_UNLOCK(szone); // we release the lock asap
- return 1;
-}
-
-/********************* Zone call backs ************************/
-
-static void
-szone_free(szone_t *szone, void *ptr)
-{
- region_t *tiny_region;
- region_t *small_region;
-
-#if DEBUG_MALLOC
- if (LOG(szone, ptr))
- malloc_printf("in szone_free with %p\n", ptr);
-#endif
- if (!ptr)
- return;
- /*
- * Try to free to a tiny region.
- */
- if ((uintptr_t)ptr & (TINY_QUANTUM - 1)) {
- szone_error(szone, "Non-aligned pointer being freed", ptr, NULL);
- return;
- }
- if ((tiny_region = tiny_region_for_ptr_no_lock(szone, ptr)) != NULL) {
- if (TINY_INDEX_FOR_PTR(ptr) >= NUM_TINY_BLOCKS) {
- szone_error(szone, "Pointer to metadata being freed", ptr, NULL);
- return;
- }
- free_tiny(szone, ptr, tiny_region);
- return;
- }
-
- /*
- * Try to free to a small region.
- */
- if ((uintptr_t)ptr & (SMALL_QUANTUM - 1)) {
- szone_error(szone, "Non-aligned pointer being freed (2)", ptr, NULL);
- return;
- }
- if ((small_region = small_region_for_ptr_no_lock(szone, ptr)) != NULL) {
- if (SMALL_META_INDEX_FOR_PTR(ptr) >= NUM_SMALL_BLOCKS) {
- szone_error(szone, "Pointer to metadata being freed (2)", ptr, NULL);
- return;
- }
- free_small(szone, ptr, small_region);
- return;
- }
-
- /* check that it's a legal large/huge allocation */
- if ((uintptr_t)ptr & (vm_page_size - 1)) {
- szone_error(szone, "non-page-aligned, non-allocated pointer being freed", ptr, NULL);
- return;
- }
- free_large_or_huge(szone, ptr);
-}
-
-static INLINE void *
-szone_malloc_should_clear(szone_t *szone, size_t size, boolean_t cleared_requested)
-{
- void *ptr;
- msize_t msize;
-
- if (size <= 31*TINY_QUANTUM) {
- // think tiny
- msize = TINY_MSIZE_FOR_BYTES(size + TINY_QUANTUM - 1);
- if (!msize)
- msize = 1;
- ptr = tiny_malloc_should_clear(szone, msize, cleared_requested);
- } else if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) && (size < LARGE_THRESHOLD)) {
- // think small
- msize = SMALL_MSIZE_FOR_BYTES(size + SMALL_QUANTUM - 1);
- if (! msize) msize = 1;
- ptr = small_malloc_should_clear(szone, msize, cleared_requested);
- } else {
- // large or huge
- size_t num_pages = round_page(size) >> vm_page_shift;
- if (num_pages == 0) /* Overflowed */
- ptr = 0;
- else
- ptr = large_and_huge_malloc(szone, num_pages);
- }
-#if DEBUG_MALLOC
- if (LOG(szone, ptr))
- malloc_printf("szone_malloc returned %p\n", ptr);
-#endif
- /*
- * If requested, scribble on allocated memory.
- */
- if ((szone->debug_flags & SCALABLE_MALLOC_DO_SCRIBBLE) && ptr && !cleared_requested && size)
- memset(ptr, 0xaa, size);
-
- return ptr;
-}
-
-static void *
-szone_malloc(szone_t *szone, size_t size) {
- return szone_malloc_should_clear(szone, size, 0);
-}
-
-static void *
-szone_calloc(szone_t *szone, size_t num_items, size_t size)
-{
- size_t total_bytes = num_items * size;
- if ((num_items > 1) && (size != 0) && ((total_bytes / size) != num_items))
- return NULL;
- return szone_malloc_should_clear(szone, total_bytes, 1);
-}
-
-static void *
-szone_valloc(szone_t *szone, size_t size)
-{
- void *ptr;
- size_t num_pages;
-
- num_pages = round_page(size) >> vm_page_shift;
- ptr = large_and_huge_malloc(szone, num_pages);
-#if DEBUG_MALLOC
- if (LOG(szone, ptr))
- malloc_printf("szone_valloc returned %p\n", ptr);
-#endif
- return ptr;
-}
-
-static size_t
-szone_size(szone_t *szone, const void *ptr)
-{
- size_t size = 0;
- boolean_t is_free;
- msize_t msize, msize_and_free;
- large_entry_t *entry;
- huge_entry_t *huge;
-
- if (!ptr)
- return 0;
-#if DEBUG_MALLOC
- if (LOG(szone, ptr)) {
- malloc_printf("in szone_size for %p (szone=%p)\n", ptr, szone);
- }
-#endif
-
- /*
- * Look for it in a tiny region.
- */
- if ((uintptr_t)ptr & (TINY_QUANTUM - 1))
- return 0;
- if (tiny_region_for_ptr_no_lock(szone, ptr)) {
- if (TINY_INDEX_FOR_PTR(ptr) >= NUM_TINY_BLOCKS)
- return 0;
- msize = get_tiny_meta_header(ptr, &is_free);
- return (is_free) ? 0 : TINY_BYTES_FOR_MSIZE(msize);
- }
-
- /*
- * Look for it in a small region.
- */
- if ((uintptr_t)ptr & (SMALL_QUANTUM - 1))
- return 0;
- if (small_region_for_ptr_no_lock(szone, ptr)) {
- if (SMALL_META_INDEX_FOR_PTR(ptr) >= NUM_SMALL_BLOCKS)
- return 0;
- msize_and_free = *SMALL_METADATA_FOR_PTR(ptr);
- return (msize_and_free & SMALL_IS_FREE) ? 0 : SMALL_BYTES_FOR_MSIZE(msize_and_free);
- }
-
- /*
- * If not page-aligned, it cannot have come from a large or huge allocation.
- */
- if ((uintptr_t)ptr & (vm_page_size - 1))
- return(0);
-
- /*
- * Look for it in a large or huge entry.
- */
- SZONE_LOCK(szone);
- entry = large_entry_for_pointer_no_lock(szone, ptr);
- if (entry) {
- size = LARGE_ENTRY_SIZE(*entry);
- } else if ((huge = huge_entry_for_pointer_no_lock(szone, ptr))) {
- size = huge->size;
- }
- SZONE_UNLOCK(szone);
-#if DEBUG_MALLOC
- if (LOG(szone, ptr)) {
- malloc_printf("szone_size for %p returned %d\n", ptr, (unsigned)size);
- }
-#endif
- return size;
-}
-
-static void *
-szone_realloc(szone_t *szone, void *ptr, size_t new_size)
-{
- size_t old_size;
- void *new_ptr;
-
-#if DEBUG_MALLOC
- if (LOG(szone, ptr)) {
- malloc_printf("in szone_realloc for %p, %d\n", ptr, (unsigned)new_size);
- }
-#endif
- if (!ptr) {
- ptr = szone_malloc(szone, new_size);
- return ptr;
- }
- old_size = szone_size(szone, ptr);
- if (!old_size) {
- szone_error(szone, "pointer being reallocated was not allocated", ptr, NULL);
- return NULL;
- }
- /* we never shrink an allocation */
- if (old_size >= new_size)
- return ptr;
-
- /*
- * If the old and new sizes both suit the tiny allocator, try to reallocate in-place.
- */
- if ((new_size + TINY_QUANTUM - 1) <= 31 * TINY_QUANTUM) {
- if (try_realloc_tiny_in_place(szone, ptr, old_size, new_size)) {
- return ptr;
- }
-
- /*
- * If the old and new sizes both suit the small allocator, and we're not protecting the
- * small allocations, try to reallocate in-place.
- */
- } else if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) &&
- ((new_size + SMALL_QUANTUM - 1) < LARGE_THRESHOLD) &&
- (old_size > 31 * TINY_QUANTUM)) {
- if (try_realloc_small_in_place(szone, ptr, old_size, new_size)) {
- return ptr;
- }
-
- /*
- * If the allocation's a large or huge allocation, try to reallocate in-place there.
- */
- } else if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) && (old_size > LARGE_THRESHOLD)) {
- if (try_realloc_large_or_huge_in_place(szone, ptr, old_size, new_size)) {
- return ptr;
- }
- }
-
- /*
- * Can't reallocate in place for whatever reason; allocate a new buffer and copy.
- */
- new_ptr = szone_malloc(szone, new_size);
- if (new_ptr == NULL)
- return NULL;
-
- /*
- * If the allocation's large enough, try to copy using VM. If that fails, or
- * if it's too small, just copy by hand.
- */
- if ((old_size < VM_COPY_THRESHOLD) ||
- vm_copy(mach_task_self(), (vm_address_t)ptr, old_size, (vm_address_t)new_ptr))
- memcpy(new_ptr, ptr, old_size);
- szone_free(szone, ptr);
-
-#if DEBUG_MALLOC
- if (LOG(szone, ptr)) {
- malloc_printf("szone_realloc returned %p for %d\n", new_ptr, (unsigned)new_size);
- }
-#endif
- return new_ptr;
-}
-
-// given a size, returns the number of pointers allocated capable of holding
-// that size, up to the limit specified by the 'count' argument. These pointers
-// are stored in the 'results' array, which must be allocated by the caller.
-// may return zero, since this function is only a best attempt at allocating
-// the pointers. clients should be prepared to call malloc for any additional
-// blocks they need.
-static unsigned
-szone_batch_malloc(szone_t *szone, size_t size, void **results, unsigned count)
-{
- msize_t msize = TINY_MSIZE_FOR_BYTES(size + TINY_QUANTUM - 1);
- unsigned found = 0;
-
- // only bother implementing this for tiny
- if (size > 31*TINY_QUANTUM)
- return 0;
- // make sure to return objects at least one quantum in size
- if (!msize)
- msize = 1;
-
- CHECK(szone, __PRETTY_FUNCTION__);
-
- // We must lock the zone now, since tiny_malloc_from_free_list assumes that
- // the caller has done so.
- SZONE_LOCK(szone);
-
- // with the zone locked, allocate objects from the free list until all
- // sufficiently large objects have been exhausted, or we have met our quota
- // of objects to allocate.
- while (found < count) {
- void *ptr = tiny_malloc_from_free_list(szone, msize);
- if (!ptr)
- break;
-
- *results++ = ptr;
- found++;
- }
- SZONE_UNLOCK(szone);
- return found;
-}
-
-static void
-szone_batch_free(szone_t *szone, void **to_be_freed, unsigned count)
-{
- unsigned cc = 0;
- void *ptr;
- region_t *tiny_region;
- boolean_t is_free;
- msize_t msize;
-
- // frees all the pointers in to_be_freed
- // note that to_be_freed may be overwritten during the process
- if (!count)
- return;
- CHECK(szone, __PRETTY_FUNCTION__);
- SZONE_LOCK(szone);
- while (cc < count) {
- ptr = to_be_freed[cc];
- if (ptr) {
- /* XXX this really slows us down */
- tiny_region = tiny_region_for_ptr_no_lock(szone, ptr);
- if (tiny_region) {
- // this is a tiny pointer
- if (TINY_INDEX_FOR_PTR(ptr) >= NUM_TINY_BLOCKS)
- break; // pointer to metadata; let the standard free deal with it
- msize = get_tiny_meta_header(ptr, &is_free);
- if (is_free)
- break; // a double free; let the standard free deal with it
- tiny_free_no_lock(szone, tiny_region, ptr, msize);
- to_be_freed[cc] = NULL;
- }
- }
- cc++;
- }
- SZONE_UNLOCK(szone);
- CHECK(szone, __PRETTY_FUNCTION__);
- while (count--) {
- ptr = to_be_freed[count];
- if (ptr)
- szone_free(szone, ptr);
- }
-}
-
-static void
-szone_destroy(szone_t *szone)
-{
- size_t index;
- large_entry_t *large;
- vm_range_t range_to_deallocate;
- huge_entry_t *huge;
-
- /* destroy large entries */
- index = szone->num_large_entries;
- while (index--) {
- large = szone->large_entries + index;
- if (!LARGE_ENTRY_IS_EMPTY(*large)) {
- // we deallocate_pages, including guard pages
- deallocate_pages(szone, (void *)LARGE_ENTRY_ADDRESS(*large), LARGE_ENTRY_SIZE(*large), szone->debug_flags);
- }
- }
- if (szone->num_large_entries * sizeof(large_entry_t) >= LARGE_THRESHOLD) {
- // we do not free in the small chunk case
- large_entries_free_no_lock(szone, szone->large_entries, szone->num_large_entries, &range_to_deallocate);
- if (range_to_deallocate.size)
- deallocate_pages(szone, (void *)range_to_deallocate.address, (size_t)range_to_deallocate.size, 0);
- }
-
- /* destroy huge entries */
- index = szone->num_huge_entries;
- while (index--) {
- huge = szone->huge_entries + index;
- deallocate_pages(szone, (void *)huge->address, huge->size, szone->debug_flags);
- }
-
- /* destroy tiny regions */
- for (index = 0; index < szone->num_tiny_regions_allocated; ++index)
- if (szone->tiny_regions[index])
- deallocate_pages(szone, szone->tiny_regions[index], TINY_REGION_SIZE, 0);
-
- /* destroy small regions */
- for (index = 0; index < szone->num_small_regions_allocated; ++index)
- if (szone->small_regions[index])
- deallocate_pages(szone, szone->small_regions[index], SMALL_REGION_SIZE, 0);
-
- /* destroy region hash rings, if any */
- if (szone->tiny_regions != szone->initial_tiny_regions) {
- size_t size = round_page(szone->num_tiny_regions_allocated * sizeof(region_t));
- deallocate_pages(szone, szone->tiny_regions, size, 0);
- }
- if (szone->small_regions != szone->initial_small_regions) {
- size_t size = round_page(szone->num_small_regions_allocated * sizeof(region_t));
- deallocate_pages(szone, szone->small_regions, size, 0);
- }
- /* Now destroy the separate szone region */
- deallocate_pages(szone, (void *)szone, SZONE_PAGED_SIZE, SCALABLE_MALLOC_ADD_GUARD_PAGES);
-}
-
-static size_t
-szone_good_size(szone_t *szone, size_t size)
-{
- msize_t msize;
- unsigned num_pages;
-
- if (size <= 31 * TINY_QUANTUM) {
- // think tiny
- msize = TINY_MSIZE_FOR_BYTES(size + TINY_QUANTUM - 1);
- if (! msize) msize = 1;
- return TINY_BYTES_FOR_MSIZE(msize);
- }
- if (!((szone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) && PROTECT_SMALL) && (size < LARGE_THRESHOLD)) {
- // think small
- msize = SMALL_MSIZE_FOR_BYTES(size + SMALL_QUANTUM - 1);
- if (! msize) msize = 1;
- return SMALL_BYTES_FOR_MSIZE(msize);
- } else {
- num_pages = round_page(size) >> vm_page_shift;
- if (!num_pages)
- num_pages = 1; // minimal allocation size for this
- return num_pages << vm_page_shift;
- }
-}
-
-unsigned szone_check_counter = 0;
-unsigned szone_check_start = 0;
-unsigned szone_check_modulo = 1;
-
-static boolean_t
-szone_check_all(szone_t *szone, const char *function)
-{
- size_t index;
-
- SZONE_LOCK(szone);
- CHECK_LOCKED(szone, __PRETTY_FUNCTION__);
-
- /* check tiny regions - chould check region count */
- for (index = 0; index < szone->num_tiny_regions_allocated; ++index) {
- region_t tiny = szone->tiny_regions[index];
- if (tiny && !tiny_check_region(szone, tiny)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- szone_error(szone, "check: tiny region incorrect", NULL,
- "*** tiny region %d incorrect szone_check_all(%s) counter=%d\n",
- index, function, szone_check_counter);
- return 0;
- }
- }
- /* check tiny free lists */
- for (index = 0; index < NUM_TINY_SLOTS; ++index) {
- if (!tiny_free_list_check(szone, index)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- szone_error(szone, "check: tiny free list incorrect", NULL,
- "*** tiny free list incorrect (slot=%d) szone_check_all(%s) counter=%d\n",
- index, function, szone_check_counter);
- return 0;
- }
- }
- /* check small regions - could check region count */
- for (index = 0; index < szone->num_small_regions_allocated; ++index) {
- region_t small = szone->small_regions[index];
- if (small && !szone_check_small_region(szone, small)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- szone_error(szone, "check: small region incorrect", NULL,
- "*** small region %d incorrect szone_check_all(%s) counter=%d\n",
- index, function, szone_check_counter);
- return 0;
- }
- }
- /* check small free lists */
- for (index = 0; index < NUM_SMALL_SLOTS; ++index) {
- if (!small_free_list_check(szone, index)) {
- SZONE_UNLOCK(szone);
- szone->debug_flags &= ~ CHECK_REGIONS;
- szone_error(szone, "check: small free list incorrect", NULL,
- "*** small free list incorrect (grain=%d) szone_check_all(%s) counter=%d\n",
- index, function, szone_check_counter);
- return 0;
- }
- }
- SZONE_UNLOCK(szone);
- return 1;
-}
-
-static boolean_t
-szone_check(szone_t *szone)
-{
- if ((++szone_check_counter % 10000) == 0)
- _malloc_printf(ASL_LEVEL_NOTICE, "at szone_check counter=%d\n", szone_check_counter);
- if (szone_check_counter < szone_check_start)
- return 1;
- if (szone_check_counter % szone_check_modulo)
- return 1;
- return szone_check_all(szone, "");
-}
-
-static kern_return_t
-szone_ptr_in_use_enumerator(task_t task, void *context, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder)
-{
- szone_t *szone;
- kern_return_t err;
-
- if (!reader) reader = _szone_default_reader;
- err = reader(task, zone_address, sizeof(szone_t), (void **)&szone);
- if (err) return err;
- err = tiny_in_use_enumerator(task, context, type_mask, szone, reader, recorder);
- if (err) return err;
- err = small_in_use_enumerator(task, context, type_mask, szone, reader, recorder);
- if (err) return err;
- err = large_in_use_enumerator(task, context, type_mask,
- (vm_address_t)szone->large_entries, szone->num_large_entries, reader,
- recorder);
- if (err) return err;
- err = huge_in_use_enumerator(task, context, type_mask,
- (vm_address_t)szone->huge_entries, szone->num_huge_entries, reader,
- recorder);
- return err;
-}
-
-// Following method is deprecated: use scalable_zone_statistics instead
-void
-scalable_zone_info(malloc_zone_t *zone, unsigned *info_to_fill, unsigned count)
-{
- szone_t *szone = (void *)zone;
- unsigned info[13];
-
- // We do not lock to facilitate debug
- info[4] = szone->num_tiny_objects;
- info[5] = szone->num_bytes_in_tiny_objects;
- info[6] = szone->num_small_objects;
- info[7] = szone->num_bytes_in_small_objects;
- info[8] = szone->num_large_objects_in_use;
- info[9] = szone->num_bytes_in_large_objects;
- info[10] = szone->num_huge_entries;
- info[11] = szone->num_bytes_in_huge_objects;
- info[12] = szone->debug_flags;
- info[0] = info[4] + info[6] + info[8] + info[10];
- info[1] = info[5] + info[7] + info[9] + info[11];
- info[3] = szone->num_tiny_regions * TINY_REGION_SIZE + szone->num_small_regions * SMALL_REGION_SIZE + info[9] + info[11];
- info[2] = info[3] - szone->tiny_bytes_free_at_end - szone->small_bytes_free_at_end;
- memcpy(info_to_fill, info, sizeof(unsigned)*count);
-}
-
-static void
-szone_print(szone_t *szone, boolean_t verbose)
-{
- unsigned info[13];
- size_t index;
- region_t region;
-
- SZONE_LOCK(szone);
- scalable_zone_info((void *)szone, info, 13);
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
- "Scalable zone %p: inUse=%d(%y) touched=%y allocated=%y flags=%d\n",
- szone, info[0], info[1], info[2], info[3], info[12]);
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
- "\ttiny=%d(%y) small=%d(%y) large=%d(%y) huge=%d(%y)\n",
- info[4], info[5], info[6], info[7], info[8], info[9], info[10], info[11]);
- // tiny
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
- "%d tiny regions:\n", szone->num_tiny_regions);
- for (index = 0; index < szone->num_tiny_regions_allocated; ++index) {
- region = szone->tiny_regions[index];
- if (region)
- print_tiny_region(verbose, region, (region == szone->last_tiny_region) ?
- szone->tiny_bytes_free_at_end : 0);
- }
- if (verbose)
- print_tiny_free_list(szone);
- // small
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
- "%d small regions:\n", szone->num_small_regions);
- for (index = 0; index < szone->num_small_regions_allocated; ++index) {
- region = szone->small_regions[index];
- if (region)
- print_small_region(szone, verbose, region,
- (region == szone->last_small_region) ?
- szone->small_bytes_free_at_end : 0);
- }
- if (verbose)
- print_small_free_list(szone);
- SZONE_UNLOCK(szone);
-}
-
-static void
-szone_log(malloc_zone_t *zone, void *log_address)
-{
- szone_t *szone = (szone_t *)zone;
-
- szone->log_address = log_address;
-}
-
-static void
-szone_force_lock(szone_t *szone)
-{
- SZONE_LOCK(szone);
-}
-
-static void
-szone_force_unlock(szone_t *szone)
-{
- SZONE_UNLOCK(szone);
-}
-
-boolean_t
-scalable_zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats, unsigned subzone)
-{
- szone_t *szone = (szone_t *)zone;
-
- switch (subzone) {
- case 0:
- stats->blocks_in_use = szone->num_tiny_objects;
- stats->size_in_use = szone->num_bytes_in_tiny_objects;
- stats->size_allocated = szone->num_tiny_regions * TINY_REGION_SIZE;
- stats->max_size_in_use = stats->size_allocated - szone->tiny_bytes_free_at_end;
- return 1;
- case 1:
- stats->blocks_in_use = szone->num_small_objects;
- stats->size_in_use = szone->num_bytes_in_small_objects;
- stats->size_allocated = szone->num_small_regions * SMALL_REGION_SIZE;
- stats->max_size_in_use = stats->size_allocated - szone->small_bytes_free_at_end;
- return 1;
- case 2:
- stats->blocks_in_use = szone->num_large_objects_in_use;
- stats->size_in_use = szone->num_bytes_in_large_objects;
- stats->max_size_in_use = stats->size_allocated = stats->size_in_use;
- return 1;
- case 3:
- stats->blocks_in_use = szone->num_huge_entries;
- stats->size_in_use = szone->num_bytes_in_huge_objects;
- stats->max_size_in_use = stats->size_allocated = stats->size_in_use;
- return 1;
- }
- return 0;
-}
-
-static void
-szone_statistics(szone_t *szone, malloc_statistics_t *stats)
-{
- size_t big_and_huge;
-
- stats->blocks_in_use =
- szone->num_tiny_objects +
- szone->num_small_objects +
- szone->num_large_objects_in_use +
- szone->num_huge_entries;
- big_and_huge = szone->num_bytes_in_large_objects + szone->num_bytes_in_huge_objects;
- stats->size_in_use = szone->num_bytes_in_tiny_objects + szone->num_bytes_in_small_objects + big_and_huge;
- stats->max_size_in_use = stats->size_allocated =
- szone->num_tiny_regions * TINY_REGION_SIZE +
- szone->num_small_regions * SMALL_REGION_SIZE +
- big_and_huge ;
-
- // Now we account for the untouched areas
- stats->max_size_in_use -= szone->tiny_bytes_free_at_end;
- stats->max_size_in_use -= szone->small_bytes_free_at_end;
-}
-
-static const struct malloc_introspection_t szone_introspect = {
- (void *)szone_ptr_in_use_enumerator,
- (void *)szone_good_size,
- (void *)szone_check,
- (void *)szone_print,
- szone_log,
- (void *)szone_force_lock,
- (void *)szone_force_unlock,
- (void *)szone_statistics
-}; // marked as const to spare the DATA section
-
-malloc_zone_t *
-create_scalable_zone(size_t initial_size, unsigned debug_flags)
-{
- szone_t *szone;
-
- /*
- * Sanity-check our build-time assumptions about the size of a page.
- * Since we have sized various things assuming the default page size,
- * attempting to determine it dynamically is not useful.
- */
- if ((vm_page_size != _vm_page_size) || (vm_page_shift != _vm_page_shift)) {
- malloc_printf("*** FATAL ERROR - machine page size does not match our assumptions.\n");
- exit(-1);
- }
-
- /* get memory for the zone, which is now separate from any region.
- add guard pages to prevent walking from any other vm allocations
- to here and overwriting the function pointers in basic_zone. */
- szone = allocate_pages(NULL, SZONE_PAGED_SIZE, 0,
- SCALABLE_MALLOC_ADD_GUARD_PAGES,
- VM_MEMORY_MALLOC);
- if (!szone)
- return NULL;
- /* set up the szone structure */
- szone->tiny_regions = szone->initial_tiny_regions;
- szone->small_regions = szone->initial_small_regions;
- szone->num_tiny_regions_allocated = INITIAL_NUM_REGIONS;
- szone->num_small_regions_allocated = INITIAL_NUM_REGIONS;
- szone->basic_zone.version = 3;
- szone->basic_zone.size = (void *)szone_size;
- szone->basic_zone.malloc = (void *)szone_malloc;
- szone->basic_zone.calloc = (void *)szone_calloc;
- szone->basic_zone.valloc = (void *)szone_valloc;
- szone->basic_zone.free = (void *)szone_free;
- szone->basic_zone.realloc = (void *)szone_realloc;
- szone->basic_zone.destroy = (void *)szone_destroy;
- szone->basic_zone.batch_malloc = (void *)szone_batch_malloc;
- szone->basic_zone.batch_free = (void *)szone_batch_free;
- szone->basic_zone.introspect = (struct malloc_introspection_t *)&szone_introspect;
- szone->debug_flags = debug_flags;
- LOCK_INIT(szone->lock);
-
-#if 0
-#warning CHECK_REGIONS enabled
- debug_flags |= CHECK_REGIONS;
-#endif
-#if 0
-#warning LOG enabled
- szone->log_address = ~0;
-#endif
- CHECK(szone, __PRETTY_FUNCTION__);
- return (malloc_zone_t *)szone;
-}
-
-/********* Support code for emacs unexec ************/
-
-/* History of freezedry version numbers:
- *
- * 1) Old malloc (before the scalable malloc implementation in this file
- * existed).
- * 2) Original freezedrying code for scalable malloc. This code was apparently
- * based on the old freezedrying code and was fundamentally flawed in its
- * assumption that tracking allocated memory regions was adequate to fake
- * operations on freezedried memory. This doesn't work, since scalable
- * malloc does not store flags in front of large page-aligned allocations.
- * 3) Original szone-based freezedrying code.
- * 4) Fresher malloc with tiny zone
- * 5) 32/64bit compatible malloc
- * 6) Metadata within 1MB and 8MB region for tiny and small
- *
- * No version backward compatibility is provided, but the version number does
- * make it possible for malloc_jumpstart() to return an error if the application
- * was freezedried with an older version of malloc.
- */
-#define MALLOC_FREEZEDRY_VERSION 6
-
-typedef struct {
- unsigned version;
- unsigned nszones;
- szone_t *szones;
-} malloc_frozen;
-
-static void *
-frozen_malloc(szone_t *zone, size_t new_size)
-{
- return malloc(new_size);
-}
-
-static void *
-frozen_calloc(szone_t *zone, size_t num_items, size_t size)
-{
- return calloc(num_items, size);
-}
-
-static void *
-frozen_valloc(szone_t *zone, size_t new_size)
-{
- return valloc(new_size);
-}
-
-static void *
-frozen_realloc(szone_t *zone, void *ptr, size_t new_size)
-{
- size_t old_size = szone_size(zone, ptr);
- void *new_ptr;
-
- if (new_size <= old_size) {
- return ptr;
- }
- new_ptr = malloc(new_size);
- if (old_size > 0) {
- memcpy(new_ptr, ptr, old_size);
- }
- return new_ptr;
-}
-
-static void
-frozen_free(szone_t *zone, void *ptr)
-{
-}
-
-static void
-frozen_destroy(szone_t *zone)
-{
-}
-
-/********* Pseudo-private API for emacs unexec ************/
-
-/*
- * malloc_freezedry() records all of the szones in use, so that they can be
- * partially reconstituted by malloc_jumpstart(). Due to the differences
- * between reconstituted memory regions and those created by the szone code,
- * care is taken not to reallocate from the freezedried memory, except in the
- * case of a non-growing realloc().
- *
- * Due to the flexibility provided by the zone registration mechanism, it is
- * impossible to implement generic freezedrying for any zone type. This code
- * only handles applications that use the szone allocator, so malloc_freezedry()
- * returns 0 (error) if any non-szone zones are encountered.
- */
-
-uintptr_t
-malloc_freezedry(void)
-{
- extern unsigned malloc_num_zones;
- extern malloc_zone_t **malloc_zones;
- malloc_frozen *data;
- unsigned i;
-
- /* Allocate space in which to store the freezedry state. */
- data = (malloc_frozen *) malloc(sizeof(malloc_frozen));
-
- /* Set freezedry version number so that malloc_jumpstart() can check for compatibility. */
- data->version = MALLOC_FREEZEDRY_VERSION;
-
- /* Allocate the array of szone pointers. */
- data->nszones = malloc_num_zones;
- data->szones = (szone_t *) calloc(malloc_num_zones, sizeof(szone_t));
-
- /*
- * Fill in the array of szone structures. They are copied rather than
- * referenced, since the originals are likely to be clobbered during malloc
- * initialization.
- */
- for (i = 0; i < malloc_num_zones; i++) {
- if (strcmp(malloc_zones[i]->zone_name, "DefaultMallocZone")) {
- /* Unknown zone type. */
- free(data->szones);
- free(data);
- return 0;
- }
- memcpy(&data->szones[i], malloc_zones[i], sizeof(szone_t));
- }
-
- return((uintptr_t)data);
-}
-
-int
-malloc_jumpstart(uintptr_t cookie)
-{
- malloc_frozen *data = (malloc_frozen *)cookie;
- unsigned i;
-
- if (data->version != MALLOC_FREEZEDRY_VERSION) {
- /* Unsupported freezedry version. */
- return 1;
- }
-
- for (i = 0; i < data->nszones; i++) {
- /* Set function pointers. Even the functions that stay the same must be
- * set, since there are no guarantees that they will be mapped to the
- * same addresses. */
- data->szones[i].basic_zone.size = (void *) szone_size;
- data->szones[i].basic_zone.malloc = (void *) frozen_malloc;
- data->szones[i].basic_zone.calloc = (void *) frozen_calloc;
- data->szones[i].basic_zone.valloc = (void *) frozen_valloc;
- data->szones[i].basic_zone.free = (void *) frozen_free;
- data->szones[i].basic_zone.realloc = (void *) frozen_realloc;
- data->szones[i].basic_zone.destroy = (void *) frozen_destroy;
- data->szones[i].basic_zone.introspect = (struct malloc_introspection_t *)&szone_introspect;
-
- /* Register the freezedried zone. */
- malloc_zone_register(&data->szones[i].basic_zone);
- }
-
- return 0;
-}
-
projects / apple / libc.git / blobdiff