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--- libmalloc/libmalloc-317.140.5/src/nano_malloc.c
+++ /dev/null
@@ -1,1959 +0,0 @@
-/*
- * Copyright (c) 1999, 2000, 2003, 2005, 2008, 2012 Apple 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@
- */
-
-#include "internal.h"
-
-/* nano_malloc for 64bit ABI */
-#if CONFIG_NANOZONE
-
-/********************* PROTOTYPES ***********************/
-
-static void nano_statistics(nanozone_t *nanozone, malloc_statistics_t *stats);
-
-/********************* VERY LOW LEVEL UTILITIES ************************/
-// msg prints after fmt, ...
-
-static MALLOC_ALWAYS_INLINE unsigned int
-nano_mag_index(const nanozone_t *nanozone)
-{
- if (os_likely(_os_cpu_number_override == -1)) {
- return (_malloc_cpu_number() >> hyper_shift) % nano_common_max_magazines;
- }
- return (_os_cpu_number_override >> hyper_shift) % nano_common_max_magazines;
-}
-
-#if NANO_PREALLOCATE_BAND_VM
-static boolean_t
-nano_preallocate_band_vm(void)
-{
- nano_blk_addr_t u;
- uintptr_t s, e;
-
- u.fields.nano_signature = NANOZONE_SIGNATURE;
- u.fields.nano_mag_index = 0;
- u.fields.nano_band = 0;
- u.fields.nano_slot = 0;
- u.fields.nano_offset = 0;
- s = u.addr; // start of first possible band
-
- u.fields.nano_mag_index = (1 << NANO_MAG_BITS) - 1;
- u.fields.nano_band = (1 << NANO_BAND_BITS) - 1;
- e = u.addr + BAND_SIZE; // end of last possible band
-
- return nano_common_allocate_vm_space(s, e - s);
-}
-#endif
-
-/*
- * We maintain separate free lists for each (quantized) size. The literature
- * calls this the "segregated policy".
- */
-
-static boolean_t
-segregated_band_grow(nanozone_t *nanozone, nano_meta_admin_t pMeta, size_t slot_bytes, unsigned int mag_index)
-{
- nano_blk_addr_t u; // the compiler holds this in a register
- uintptr_t p, s;
- size_t watermark, hiwater;
-
- if (0 == pMeta->slot_current_base_addr) { // First encounter?
-
- u.fields.nano_signature = NANOZONE_SIGNATURE;
- u.fields.nano_mag_index = mag_index;
- u.fields.nano_band = 0;
- u.fields.nano_slot = (slot_bytes >> SHIFT_NANO_QUANTUM) - 1;
- u.fields.nano_offset = 0;
-
- p = u.addr;
- pMeta->slot_bytes = (unsigned int)slot_bytes;
- pMeta->slot_objects = SLOT_IN_BAND_SIZE / slot_bytes;
- } else {
- p = pMeta->slot_current_base_addr + BAND_SIZE; // Growing, so stride ahead by BAND_SIZE
-
- u.addr = (uint64_t)p;
- if (0 == u.fields.nano_band) { // Did the band index wrap?
- return FALSE;
- }
-
- assert(slot_bytes == pMeta->slot_bytes);
- }
- pMeta->slot_current_base_addr = p;
-
- mach_vm_address_t vm_addr = p & ~((uintptr_t)(BAND_SIZE - 1)); // Address of the (2MB) band covering this (128KB) slot
- if (nanozone->band_max_mapped_baseaddr[mag_index] < vm_addr) {
-#if !NANO_PREALLOCATE_BAND_VM
- // Obtain the next band to cover this slot
- kern_return_t kr = mach_vm_map(mach_task_self(), &vm_addr, BAND_SIZE, 0, VM_MAKE_TAG(VM_MEMORY_MALLOC_NANO),
- MEMORY_OBJECT_NULL, 0, FALSE, VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
-
- void *q = (void *)vm_addr;
- if (kr || q != (void *)(p & ~((uintptr_t)(BAND_SIZE - 1)))) { // Must get exactly what we asked for
- if (!kr) {
- mach_vm_deallocate(mach_task_self(), vm_addr, BAND_SIZE);
- }
- return FALSE;
- }
-#endif
- nanozone->band_max_mapped_baseaddr[mag_index] = vm_addr;
- }
-
- // Randomize the starting allocation from this slot (introduces 11 to 14 bits of entropy)
- if (0 == pMeta->slot_objects_mapped) { // First encounter?
- pMeta->slot_objects_skipped = (malloc_entropy[1] % (SLOT_IN_BAND_SIZE / slot_bytes));
- pMeta->slot_bump_addr = p + (pMeta->slot_objects_skipped * slot_bytes);
- } else {
- pMeta->slot_bump_addr = p;
- }
-
- pMeta->slot_limit_addr = p + (SLOT_IN_BAND_SIZE / slot_bytes) * slot_bytes;
- pMeta->slot_objects_mapped += (SLOT_IN_BAND_SIZE / slot_bytes);
-
- u.fields.nano_signature = NANOZONE_SIGNATURE;
- u.fields.nano_mag_index = mag_index;
- u.fields.nano_band = 0;
- u.fields.nano_slot = 0;
- u.fields.nano_offset = 0;
- s = u.addr; // Base for this core.
-
- // Set the high water mark for this CPU's entire magazine, if this resupply raised it.
- watermark = nanozone->core_mapped_size[mag_index];
- hiwater = MAX(watermark, p - s + SLOT_IN_BAND_SIZE);
- nanozone->core_mapped_size[mag_index] = hiwater;
-
- return TRUE;
-}
-
-static inline unsigned long
-divrem(unsigned long a, unsigned int b, unsigned int *remainder)
-{
- // Encapsulating the modulo and division in an in-lined function convinces the compiler
- // to issue just a single divide instruction to obtain quotient and remainder. Go figure.
- *remainder = a % b;
- return a / b;
-}
-
-static MALLOC_INLINE void *
-segregated_next_block(nanozone_t *nanozone, nano_meta_admin_t pMeta, size_t slot_bytes, unsigned int mag_index)
-{
- while (1) {
- uintptr_t theLimit = pMeta->slot_limit_addr; // Capture the slot limit that bounds slot_bump_addr right now
- uintptr_t b = OSAtomicAdd64Barrier(slot_bytes, (volatile int64_t *)&(pMeta->slot_bump_addr));
- b -= slot_bytes; // Atomic op returned addr of *next* free block. Subtract to get addr for *this* allocation.
-
- if (b < theLimit) { // Did we stay within the bound of the present slot allocation?
- return (void *)b; // Yep, so the slot_bump_addr this thread incremented is good to go
- } else {
- if (pMeta->slot_exhausted) { // exhausted all the bands availble for this slot?
- pMeta->slot_bump_addr = theLimit;
- return 0; // We're toast
- } else {
- // One thread will grow the heap, others will see its been grown and retry allocation
- _malloc_lock_lock(&nanozone->band_resupply_lock[mag_index]);
- // re-check state now that we've taken the lock
- if (pMeta->slot_exhausted) {
- _malloc_lock_unlock(&nanozone->band_resupply_lock[mag_index]);
- return 0; // Toast
- } else if (b < pMeta->slot_limit_addr) {
- _malloc_lock_unlock(&nanozone->band_resupply_lock[mag_index]);
- continue; // ... the slot was successfully grown by first-taker (not us). Now try again.
- } else if (segregated_band_grow(nanozone, pMeta, slot_bytes, mag_index)) {
- _malloc_lock_unlock(&nanozone->band_resupply_lock[mag_index]);
- continue; // ... the slot has been successfully grown by us. Now try again.
- } else {
- pMeta->slot_exhausted = TRUE;
- pMeta->slot_bump_addr = theLimit;
- _malloc_lock_unlock(&nanozone->band_resupply_lock[mag_index]);
- return 0;
- }
- }
- }
- }
-}
-
-static MALLOC_INLINE size_t
-segregated_size_to_fit(nanozone_t *nanozone, size_t size, size_t *pKey)
-{
- size_t k, slot_bytes;
-
- if (0 == size) {
- size = NANO_REGIME_QUANTA_SIZE; // Historical behavior
- }
- k = (size + NANO_REGIME_QUANTA_SIZE - 1) >> SHIFT_NANO_QUANTUM; // round up and shift for number of quanta
- slot_bytes = k << SHIFT_NANO_QUANTUM; // multiply by power of two quanta size
- *pKey = k - 1; // Zero-based!
-
- return slot_bytes;
-}
-
-static MALLOC_INLINE index_t
-offset_to_index(nanozone_t *nanozone, nano_meta_admin_t pMeta, uintptr_t offset)
-{
- unsigned int slot_bytes = pMeta->slot_bytes;
- unsigned int slot_objects = pMeta->slot_objects; // SLOT_IN_BAND_SIZE / slot_bytes;
- unsigned int rem;
- unsigned long quo = divrem(offset, BAND_SIZE, &rem);
-
- assert(0 == rem % slot_bytes || pMeta->slot_exhausted);
- return (index_t)((quo * slot_objects) + (rem / slot_bytes));
-}
-
-static MALLOC_INLINE uintptr_t
-index_to_offset(nanozone_t *nanozone, nano_meta_admin_t pMeta, index_t i)
-{
- unsigned int slot_bytes = pMeta->slot_bytes;
- unsigned int slot_objects = pMeta->slot_objects; // SLOT_IN_BAND_SIZE / slot_bytes;
- unsigned int rem;
- unsigned long quo = divrem(i, slot_objects, &rem);
-
- return (quo * BAND_SIZE) + (rem * slot_bytes);
-}
-
-static kern_return_t
-segregated_in_use_enumerator(task_t task,
- void *context,
- unsigned type_mask,
- nanozone_t *nanozone,
- memory_reader_t reader,
- vm_range_recorder_t recorder)
-{
- unsigned int mag_index, slot_key;
- vm_range_t ptr_range;
- vm_range_t buffer[MAX_RECORDER_BUFFER];
- kern_return_t err;
- unsigned count = 0;
-
- for (mag_index = 0; mag_index < nano_common_max_magazines; mag_index++) {
- uintptr_t clone_magazine; // magazine base for ourselves
- nano_blk_addr_t p; // slot base for remote
- uintptr_t clone_slot_base; // slot base for ourselves (tracks with "p")
-
- // Establish p as base address for slot 0 in remote
- p.fields.nano_signature = NANOZONE_SIGNATURE;
- p.fields.nano_mag_index = mag_index;
- p.fields.nano_band = 0;
- p.fields.nano_slot = 0;
- p.fields.nano_offset = 0;
-
- if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
- mach_vm_address_t vm_addr;
- mach_vm_size_t alloc_size = nanozone->core_mapped_size[mag_index];
- int alloc_flags = VM_FLAGS_ANYWHERE | VM_MAKE_TAG(VM_MEMORY_MALLOC);
-
- vm_addr = vm_page_size;
- kern_return_t kr = mach_vm_allocate(mach_task_self(), &vm_addr, alloc_size, alloc_flags);
- if (kr) {
- return kr;
- }
- clone_magazine = (uintptr_t)vm_addr;
- clone_slot_base = clone_magazine; // base for slot 0 in this local magazine
- } else {
- clone_slot_base = clone_magazine = 0; // and won't be used in this loop
- }
-
- for (slot_key = 0; slot_key < SLOT_KEY_LIMIT; p.addr += SLOT_IN_BAND_SIZE, // Advance to next slot base for remote
- clone_slot_base += SLOT_IN_BAND_SIZE, // Advance to next slot base for ourselves
- slot_key++) {
- nano_meta_admin_t pMeta = &(nanozone->meta_data[mag_index][slot_key]);
- size_t slot_objects_mapped = pMeta->slot_objects_mapped; // capture this volatile count
-
- if (0 == slot_objects_mapped) { // Nothing allocated in this magazine for this slot?
- continue;
- }
-
- if (type_mask & MALLOC_ADMIN_REGION_RANGE_TYPE) {
- /* do NOTHING as there is no distinct admin region */
- }
-
- if (type_mask & (MALLOC_PTR_REGION_RANGE_TYPE | MALLOC_ADMIN_REGION_RANGE_TYPE)) {
- nano_blk_addr_t q = p;
- uintptr_t skip_adj = index_to_offset(nanozone, pMeta, (index_t)pMeta->slot_objects_skipped);
-
- while (q.addr < pMeta->slot_limit_addr) {
- ptr_range.address = q.addr + skip_adj;
- ptr_range.size = SLOT_IN_BAND_SIZE - skip_adj;
- skip_adj = 0;
- recorder(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &ptr_range, 1);
- q.addr += BAND_SIZE;
- }
- }
-
- if (type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE) {
- nano_blk_addr_t q = p;
- uintptr_t slot_band, clone_slot_band_base = clone_slot_base;
- uintptr_t skip_adj = index_to_offset(nanozone, pMeta, (index_t)pMeta->slot_objects_skipped);
-
- // Copy the bitarray_t denoting madvise()'d pages (if any) into *this* task's address space
- bitarray_t madv_page_bitarray;
- int log_page_count;
-
- if (pMeta->slot_madvised_pages) {
- log_page_count = pMeta->slot_madvised_log_page_count;
- err = reader(task, (vm_address_t)(pMeta->slot_madvised_pages), bitarray_size(log_page_count),
- (void **)&madv_page_bitarray);
- if (err) {
- return err;
- }
- } else {
- madv_page_bitarray = NULL;
- log_page_count = 0;
- }
-
- while (q.addr < pMeta->slot_limit_addr) {
- // read slot in each remote band. Lands in some random location. Do not read
- // parts of the slot that are in madvised pages.
- if (!madv_page_bitarray) {
- // Nothing madvised yet - read everything in one go.
- size_t len = MIN(pMeta->slot_bump_addr - q.addr, SLOT_IN_BAND_SIZE) - skip_adj;
- err = reader(task, (vm_address_t)(q.addr + skip_adj), len, (void **)&slot_band);
- if (err) {
- return err;
- }
-
- // Place the data just read in the correct position relative to the local magazine.
- memcpy((void *)(clone_slot_band_base + skip_adj), (void *)slot_band, len);
- } else {
- // We madvised at least one page. Read only the pages that
- // have not been madvised. If bitarray_t had operations
- // like "get next bit set after a given bit" and "find
- // next unset bit after a given bit", we could do this more
- // efficiently but given that it doesn't, we have to walk
- // through each page individually. In practice this is not
- // much of an issue because this code is only used by
- // sampling tools and the additional time required is not
- // really noticeable.
- size_t len = MIN(pMeta->slot_bump_addr - q.addr, SLOT_IN_BAND_SIZE) - skip_adj;
- vm_address_t start_addr = (vm_address_t)(q.addr + skip_adj);
- vm_address_t end_addr = (vm_address_t)(start_addr + len);
- void *target_addr = (void *)(clone_slot_band_base + skip_adj);
- for (vm_address_t addr = start_addr; addr < end_addr;) {
- vm_address_t next_page_addr = trunc_page_kernel(addr + vm_kernel_page_size);
- size_t read_size = MIN(len, next_page_addr - addr);
-
- boolean_t madvised = false;
- nano_blk_addr_t r;
- r.addr = addr;
- index_t pgnum = ((((unsigned)r.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)r.fields.nano_offset)) >>
- vm_kernel_page_shift;
- unsigned int log_page_count = pMeta->slot_madvised_log_page_count;
- madvised = (pgnum < (1 << log_page_count)) &&
- bitarray_get(madv_page_bitarray, log_page_count, pgnum);
- if (!madvised) {
- // This is not an madvised page - grab the data.
- err = reader(task, addr, read_size, (void **)&slot_band);
- if (err) {
- return err;
- }
-
- // Place the data just read in the correct position relative to the local magazine.
- memcpy(target_addr, (void *)slot_band, read_size);
- } else {
- // This is an madvised page - there should be nothing in here that's
- // on the freelist, so just write garbage to the target memory.
- memset(target_addr, (char)0xee, read_size);
- }
- addr = next_page_addr;
- target_addr += read_size;
- len -= read_size;
- }
- }
-
- // Simultaneously advance pointers in remote and ourselves to the next band.
- q.addr += BAND_SIZE;
- clone_slot_band_base += BAND_SIZE;
- skip_adj = 0;
- }
-
- // Walk the slot free list and populate a bitarray_t
- int log_size = 64 - __builtin_clzl(slot_objects_mapped);
- bitarray_t slot_bitarray = bitarray_create(log_size);
-
- if (!slot_bitarray) {
- return errno;
- }
-
- chained_block_t t;
- unsigned stoploss = (unsigned)slot_objects_mapped;
- while ((t = OSAtomicDequeue(
- &(pMeta->slot_LIFO), offsetof(struct chained_block_s, next) + (clone_slot_base - p.addr)))) {
- if (0 == stoploss) {
- malloc_report(ASL_LEVEL_ERR, "Free list walk in segregated_in_use_enumerator exceeded object count.\n");
- break;
- }
- stoploss--;
-
- uintptr_t offset = ((uintptr_t)t - p.addr); // offset from beginning of slot, task-independent
- index_t block_index = offset_to_index(nanozone, pMeta, offset);
-
- if (block_index < slot_objects_mapped) {
- bitarray_set(slot_bitarray, log_size, block_index);
- }
- }
- // N.B. pMeta->slot_LIFO in *this* task is now drained (remote free list has *not* been disturbed)
-
-
- // Enumerate all the block indices issued to date, and report those not on the free list
- index_t i;
- for (i = (index_t)pMeta->slot_objects_skipped; i < slot_objects_mapped; ++i) {
- uintptr_t block_offset = index_to_offset(nanozone, pMeta, i);
- if (p.addr + block_offset >= pMeta->slot_bump_addr) {
- break;
- }
-
- // blocks falling on madvise()'d pages are free! So not enumerated.
- if (madv_page_bitarray) {
- nano_blk_addr_t q;
- index_t pgnum, pgnum_end;
-
- q.addr = p.addr + block_offset;
- pgnum = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >>
- vm_kernel_page_shift;
- q.addr += pMeta->slot_bytes - 1;
- pgnum_end = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >>
- vm_kernel_page_shift;
-
- if (pgnum < (1 << log_page_count)) { // bounds check for bitarray_get()'s that follow
- if (bitarray_get(madv_page_bitarray, log_page_count, pgnum) ||
- bitarray_get(madv_page_bitarray, log_page_count, pgnum_end)) {
- continue;
- }
- }
- }
-
- if (!bitarray_get(slot_bitarray, log_size, i)) {
- buffer[count].address = p.addr + block_offset;
- buffer[count].size = (slot_key + 1) << SHIFT_NANO_QUANTUM;
- count++;
- if (count >= MAX_RECORDER_BUFFER) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- count = 0;
- }
- }
- }
- if (count) {
- recorder(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, buffer, count);
- count = 0;
- }
-
- free(slot_bitarray);
- }
- }
- if (clone_magazine) {
- mach_vm_address_t vm_addr = clone_magazine;
- mach_vm_size_t alloc_size = nanozone->core_mapped_size[mag_index];
- mach_vm_deallocate(mach_task_self(), vm_addr, alloc_size);
- }
- }
- return 0;
-}
-
-/****************** nanozone methods **********************/
-/*
- * These methods are called with "ptr" known to possess the nano signature (from
- * which we can additionally infer "ptr" is not NULL), and with "size" bounded to
- * the extent of the nano allocation regime -- (0, 256].
- */
-
-static MALLOC_INLINE MALLOC_UNUSED boolean_t
-_nano_block_inuse_p(nanozone_t *nanozone, const void *ptr)
-{
- nano_blk_addr_t p; // happily, the compiler holds this in a register
- nano_meta_admin_t pMeta;
- chained_block_t head = NULL, tail = NULL, t;
- boolean_t inuse = TRUE;
-
- p.addr = (uint64_t)ptr; // place ptr on the dissecting table
-
- pMeta = &(nanozone->meta_data[p.fields.nano_mag_index][p.fields.nano_slot]);
-
- // pop elements off the free list all the while looking for ptr.
- unsigned stoploss = (unsigned)pMeta->slot_objects_mapped;
- while ((t = OSAtomicDequeue(&(pMeta->slot_LIFO), offsetof(struct chained_block_s, next)))) {
- if (0 == stoploss) {
- malloc_zone_error(nanozone->debug_flags, true,
- "Free list walk for slot %p in _nano_block_inuse_p exceeded object count.\n",
- (void *)&(pMeta->slot_LIFO));
- }
- stoploss--;
-
- if (NULL == head) {
- head = t;
- } else {
- tail->next = t;
- }
- tail = t;
-
- if (ptr == t) {
- inuse = FALSE;
- break;
- }
- }
- if (tail) {
- tail->next = NULL;
- }
-
- // push the free list extracted above back onto the LIFO, all at once
- if (head) {
- OSAtomicEnqueue(&(pMeta->slot_LIFO), head, (uintptr_t)tail - (uintptr_t)head + offsetof(struct chained_block_s, next));
- }
-
- return inuse;
-}
-
-static MALLOC_INLINE size_t
-__nano_vet_and_size_inner(nanozone_t *nanozone, const void *ptr, boolean_t inner)
-{
- // Extracts the size of the block in bytes. Checks for a plausible ptr.
- nano_blk_addr_t p; // the compiler holds this in a register
- nano_meta_admin_t pMeta;
-
- p.addr = (uint64_t)ptr; // Begin the dissection of ptr
-
- if (NANOZONE_SIGNATURE != p.fields.nano_signature) {
- return 0;
- }
-
- if (nano_common_max_magazines <= p.fields.nano_mag_index) {
- return 0;
- }
-
- if (!inner && p.fields.nano_offset & NANO_QUANTA_MASK) { // stray low-order bits?
- return 0;
- }
-
- pMeta = &(nanozone->meta_data[p.fields.nano_mag_index][p.fields.nano_slot]);
- if ((void *)(pMeta->slot_bump_addr) <= ptr) {
- return 0; // Beyond what's ever been allocated!
- }
- if (!inner && ((p.fields.nano_offset % pMeta->slot_bytes) != 0)) {
- return 0; // Not an exact multiple of the block size for this slot
- }
- return pMeta->slot_bytes;
-}
-
-
-static MALLOC_INLINE size_t
-__nano_vet_and_size(nanozone_t *nanozone, const void *ptr)
-{
- return __nano_vet_and_size_inner(nanozone, ptr, false);
-}
-
-static MALLOC_ALWAYS_INLINE boolean_t
-_nano_block_has_canary_value(nanozone_t *nanozone, const void *ptr)
-{
- return (((chained_block_t)ptr)->double_free_guard ^ nanozone->cookie)
- == (uintptr_t)ptr;
-}
-
-static MALLOC_ALWAYS_INLINE void
-_nano_block_set_canary_value(nanozone_t *nanozone, const void *ptr)
-{
- ((chained_block_t)ptr)->double_free_guard =
- ((uintptr_t)ptr) ^ nanozone->cookie;
-}
-
-static MALLOC_INLINE size_t
-_nano_vet_and_size_of_live(nanozone_t *nanozone, const void *ptr)
-{
- size_t size = __nano_vet_and_size(nanozone, ptr);
-
- if (0 == size) { // ptr fails sanity check?
- return 0;
- }
-
- // We have the invariant: If ptr is on a free list, then ptr->double_free_guard is the canary.
- // So if ptr->double_free_guard is NOT the canary, then ptr is not on a free list, hence is live.
- if (!_nano_block_has_canary_value(nanozone, ptr)) {
- return size; // Common case: not on a free list, hence live. Return its size.
- } else {
- // confirm that ptr is live despite ptr->double_free_guard having the canary value
- if (_nano_block_inuse_p(nanozone, ptr)) {
- return size; // live block that exhibits canary
- } else {
- return 0; // ptr wasn't live after all (likely a double free)
- }
- }
-}
-
-static MALLOC_INLINE size_t
-_nano_vet_and_size_of_free(nanozone_t *nanozone, const void *ptr)
-{
- size_t size = __nano_vet_and_size(nanozone, ptr);
-
- if (0 == size) { // ptr fails sanity check?
- return 0;
- }
-
- // ptr was just dequed from a free list, so ptr->double_free_guard must have the canary value.
- if (_nano_block_has_canary_value(nanozone, ptr)) {
- return size; // return the size of this well formed free block.
- } else {
- return 0; // Broken invariant: If ptr is on a free list, then ptr->double_free_guard is the canary. (likely use after free)
- }
-}
-
-static void *
-_nano_malloc_check_clear(nanozone_t *nanozone, size_t size, boolean_t cleared_requested)
-{
- MALLOC_TRACE(TRACE_nano_malloc, (uintptr_t)nanozone, size, cleared_requested, 0);
-
- void *ptr;
- size_t slot_key;
- size_t slot_bytes = segregated_size_to_fit(nanozone, size, &slot_key); // Note slot_key is set here
- mag_index_t mag_index = nano_mag_index(nanozone);
-
- nano_meta_admin_t pMeta = &(nanozone->meta_data[mag_index][slot_key]);
-
- ptr = OSAtomicDequeue(&(pMeta->slot_LIFO), offsetof(struct chained_block_s, next));
- if (ptr) {
- unsigned debug_flags = nanozone->debug_flags;
-#if NANO_FREE_DEQUEUE_DILIGENCE
- size_t gotSize;
- nano_blk_addr_t p; // the compiler holds this in a register
-
- p.addr = (uint64_t)ptr; // Begin the dissection of ptr
- if (NANOZONE_SIGNATURE != p.fields.nano_signature) {
- malloc_zone_error(debug_flags, true,
- "Invalid signature for pointer %p dequeued from free list\n",
- ptr);
- }
-
- if (mag_index != p.fields.nano_mag_index) {
- malloc_zone_error(debug_flags, true,
- "Mismatched magazine for pointer %p dequeued from free list\n",
- ptr);
- }
-
- gotSize = _nano_vet_and_size_of_free(nanozone, ptr);
- if (0 == gotSize) {
- malloc_zone_error(debug_flags, true,
- "Invalid pointer %p dequeued from free list\n", ptr);
- }
- if (gotSize != slot_bytes) {
- malloc_zone_error(debug_flags, true,
- "Mismatched size for pointer %p dequeued from free list\n",
- ptr);
- }
-
- if (!_nano_block_has_canary_value(nanozone, ptr)) {
- malloc_zone_error(debug_flags, true,
- "Heap corruption detected, free list canary is damaged for %p\n"
- "*** Incorrect guard value: %lu\n", ptr,
- ((chained_block_t)ptr)->double_free_guard);
- }
-
-#if defined(DEBUG)
- void *next = (void *)(((chained_block_t)ptr)->next);
- if (next) {
- p.addr = (uint64_t)next; // Begin the dissection of next
- if (NANOZONE_SIGNATURE != p.fields.nano_signature) {
- malloc_zone_error(debug_flags, true,
- "Invalid next signature for pointer %p dequeued from free "
- "list, next = %p\n", ptr, "next");
- }
-
- if (mag_index != p.fields.nano_mag_index) {
- malloc_zone_error(debug_flags, true,
- "Mismatched next magazine for pointer %p dequeued from "
- "free list, next = %p\n", ptr, next);
- }
-
- gotSize = _nano_vet_and_size_of_free(nanozone, next);
- if (0 == gotSize) {
- malloc_zone_error(debug_flags, true,
- "Invalid next for pointer %p dequeued from free list, "
- "next = %p\n", ptr, next);
- }
- if (gotSize != slot_bytes) {
- malloc_zone_error(debug_flags, true,
- "Mismatched next size for pointer %p dequeued from free "
- "list, next = %p\n", ptr, next);
- }
- }
-#endif /* DEBUG */
-#endif /* NANO_FREE_DEQUEUE_DILIGENCE */
-
- ((chained_block_t)ptr)->double_free_guard = 0;
- ((chained_block_t)ptr)->next = NULL; // clear out next pointer to protect free list
- } else {
- ptr = segregated_next_block(nanozone, pMeta, slot_bytes, mag_index);
- }
-
- if (cleared_requested && ptr) {
- memset(ptr, 0, slot_bytes); // TODO: Needs a memory barrier after memset to ensure zeroes land first?
- }
- return ptr;
-}
-
-static void *
-_nano_malloc_check_scribble(nanozone_t *nanozone, size_t size)
-{
- void *ptr = _nano_malloc_check_clear(nanozone, size, 0);
-
- /*
- * Scribble on allocated memory when requested.
- */
- if ((nanozone->debug_flags & MALLOC_DO_SCRIBBLE) && ptr && size) {
- memset(ptr, SCRIBBLE_BYTE, _nano_vet_and_size_of_live(nanozone, ptr));
- }
-
- return ptr;
-}
-
-static MALLOC_INLINE size_t
-_nano_size(nanozone_t *nanozone, const void *ptr)
-{
- return _nano_vet_and_size_of_live(nanozone, ptr);
-}
-
-static MALLOC_INLINE size_t
-_nano_good_size(nanozone_t *nanozone, size_t size)
-{
- return (size <= NANO_REGIME_QUANTA_SIZE) ? NANO_REGIME_QUANTA_SIZE
- : (((size + NANO_REGIME_QUANTA_SIZE - 1) >> SHIFT_NANO_QUANTUM) << SHIFT_NANO_QUANTUM);
-}
-
-static MALLOC_INLINE void _nano_free_trusted_size_check_scribble(nanozone_t *nanozone,
- void *ptr,
- size_t trusted_size,
- boolean_t do_scribble) MALLOC_ALWAYS_INLINE;
-
-static MALLOC_INLINE void
-_nano_free_trusted_size_check_scribble(nanozone_t *nanozone, void *ptr, size_t trusted_size, boolean_t do_scribble)
-{
- if (trusted_size) {
- nano_blk_addr_t p; // happily, the compiler holds this in a register
- nano_meta_admin_t pMeta;
-
- if (do_scribble) {
- (void)memset(ptr, SCRABBLE_BYTE, trusted_size);
- }
- _nano_block_set_canary_value(nanozone, ptr);
-
- p.addr = (uint64_t)ptr; // place ptr on the dissecting table
- pMeta = &(nanozone->meta_data[p.fields.nano_mag_index][p.fields.nano_slot]);
- OSAtomicEnqueue(&(pMeta->slot_LIFO), ptr, offsetof(struct chained_block_s, next));
- } else {
- malloc_zone_error(nanozone->debug_flags, true,
- "Freeing unallocated pointer %p\n", ptr);
- }
-}
-
-static MALLOC_INLINE void _nano_free_check_scribble(nanozone_t *nanozone, void *ptr, boolean_t do_scribble) MALLOC_ALWAYS_INLINE;
-
-static MALLOC_INLINE void
-_nano_free_check_scribble(nanozone_t *nanozone, void *ptr, boolean_t do_scribble)
-{
- _nano_free_trusted_size_check_scribble(nanozone, ptr, _nano_vet_and_size_of_live(nanozone, ptr), do_scribble);
-}
-
-static MALLOC_INLINE void *
-_nano_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
-{
- size_t old_size, new_good_size, valid_size;
- void *new_ptr;
-
- if (FALSE && NULL == ptr) { // ptr has our_signature so can't be NULL, but if it were Posix sez ...
- // If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
- return _nano_malloc_check_scribble(nanozone, new_size);
- } else if (0 == new_size) {
- // If size is 0 and ptr is not a null pointer, the object pointed to is freed.
- _nano_free_check_scribble(nanozone, ptr, (nanozone->debug_flags & MALLOC_DO_SCRIBBLE));
- // If size is 0, either a null pointer or a unique pointer that can be successfully passed
- // to free() shall be returned.
- return _nano_malloc_check_scribble(nanozone, 1);
- }
-
- old_size = _nano_vet_and_size_of_live(nanozone, ptr);
- if (!old_size) {
- malloc_zone_error(nanozone->debug_flags, true,
- "pointer %p being reallocated was not allocated\n", ptr);
- return NULL;
- }
-
- new_good_size = _nano_good_size(nanozone, new_size);
- if (new_good_size > old_size) {
- /* Must grow. FALL THROUGH to alloc/copy/free. */
- } else if (new_good_size <= (old_size >> 1)) {
- /* Serious shrinkage (more than half). FALL THROUGH to alloc/copy/free. */
- } else {
- /* Let's hang on to what we got. */
- if (nanozone->debug_flags & MALLOC_DO_SCRIBBLE) {
- memset(ptr + new_size, SCRIBBLE_BYTE, old_size - new_size);
- }
- return ptr;
- }
-
- /*
- * Allocate a new buffer and copy.
- */
- new_ptr = _nano_malloc_check_scribble(nanozone, new_good_size);
- if (new_ptr == NULL) {
- return NULL;
- }
-
- valid_size = MIN(old_size, new_good_size);
- memcpy(new_ptr, ptr, valid_size);
- _nano_free_check_scribble(nanozone, ptr, (nanozone->debug_flags & MALLOC_DO_SCRIBBLE));
-
- return new_ptr;
-}
-
-static MALLOC_INLINE void
-_nano_destroy(nanozone_t *nanozone)
-{
- /* Now destroy the separate nanozone region */
- nano_common_deallocate_pages((void *)nanozone, NANOZONE_PAGED_SIZE,
- nanozone->debug_flags);
-}
-
-/****************** nanozone dispatch **********************/
-
-static void *
-nano_malloc(nanozone_t *nanozone, size_t size)
-{
- if (size <= NANO_MAX_SIZE) {
- void *p = _nano_malloc_check_clear(nanozone, size, 0);
- if (p) {
- return p;
- } else {
- /* FALLTHROUGH to helper zone */
- }
- }
-
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->malloc(zone, size);
-}
-
-static void *
-nano_forked_malloc(nanozone_t *nanozone, size_t size)
-{
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->malloc(zone, size);
-}
-
-static void *
-nano_malloc_scribble(nanozone_t *nanozone, size_t size)
-{
- if (size <= NANO_MAX_SIZE) {
- void *ptr = _nano_malloc_check_clear(nanozone, size, 0);
- if (ptr) {
- /*
- * Scribble on allocated memory.
- */
- if (size) {
- memset(ptr, SCRIBBLE_BYTE, _nano_vet_and_size_of_live(nanozone, ptr));
- }
-
- return ptr;
- } else {
- /* FALLTHROUGH to helper zone */
- }
- }
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->malloc(zone, size);
-}
-
-static void *
-nano_calloc(nanozone_t *nanozone, size_t num_items, size_t size)
-{
- size_t total_bytes;
-
- if (calloc_get_size(num_items, size, 0, &total_bytes)) {
- return NULL;
- }
-
- if (total_bytes <= NANO_MAX_SIZE) {
- void *p = _nano_malloc_check_clear(nanozone, total_bytes, 1);
- if (p) {
- return p;
- } else {
- /* FALLTHROUGH to helper zone */
- }
- }
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->calloc(zone, 1, total_bytes);
-}
-
-static void *
-nano_forked_calloc(nanozone_t *nanozone, size_t num_items, size_t size)
-{
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->calloc(zone, num_items, size);
-}
-
-static void *
-nano_valloc(nanozone_t *nanozone, size_t size)
-{
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->valloc(zone, size);
-}
-
-static MALLOC_INLINE void
-__nano_free_definite_size(nanozone_t *nanozone, void *ptr, size_t size, boolean_t do_scribble) MALLOC_ALWAYS_INLINE;
-
-static MALLOC_INLINE void
-__nano_free_definite_size(nanozone_t *nanozone, void *ptr, size_t size, boolean_t do_scribble)
-{
- nano_blk_addr_t p; // happily, the compiler holds this in a register
-
- p.addr = (uint64_t)ptr; // place ptr on the dissecting table
- if (NANOZONE_SIGNATURE == p.fields.nano_signature) {
- if (size == ((p.fields.nano_slot + 1) << SHIFT_NANO_QUANTUM)) { // "Trust but verify."
- _nano_free_trusted_size_check_scribble(nanozone, ptr, size, do_scribble);
- return;
- } else {
- malloc_zone_error(nanozone->debug_flags, true,
- "Freeing pointer %p whose size was misdeclared\n", ptr);
- }
- } else {
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- zone->free_definite_size(zone, ptr, size);
- return;
- }
- /* NOTREACHED */
-}
-
-static void
-nano_free_definite_size(nanozone_t *nanozone, void *ptr, size_t size)
-{
- __nano_free_definite_size(nanozone, ptr, size, 0);
-}
-
-static void
-nano_free_definite_size_scribble(nanozone_t *nanozone, void *ptr, size_t size)
-{
- __nano_free_definite_size(nanozone, ptr, size, 1);
-}
-
-static MALLOC_INLINE void __nano_free(nanozone_t *nanozone, void *ptr, boolean_t do_scribble) MALLOC_ALWAYS_INLINE;
-
-static MALLOC_INLINE void
-__nano_free(nanozone_t *nanozone, void *ptr, boolean_t do_scribble)
-{
- MALLOC_TRACE(TRACE_nano_free, (uintptr_t)nanozone, (uintptr_t)ptr, do_scribble, 0);
-
- if (!ptr) {
- return; // Protect against malloc_zone_free() passing NULL.
- }
-
- // <rdar://problem/26481467> exhausting a slot may result in a pointer with
- // the nanozone prefix being given to nano_free via malloc_zone_free. Calling
- // vet_and_size here, instead of in _nano_free_check_scribble means we can
- // early-out into the helper_zone if it turns out nano does not own this ptr.
- size_t sz = _nano_vet_and_size_of_live(nanozone, ptr);
-
- if (sz) {
- _nano_free_trusted_size_check_scribble(nanozone, ptr, sz, do_scribble);
- return;
- } else {
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- zone->free(zone, ptr);
- return;
- }
- /* NOTREACHED */
-}
-
-static void
-nano_free(nanozone_t *nanozone, void *ptr)
-{
- __nano_free(nanozone, ptr, 0);
-}
-
-static void
-nano_forked_free(nanozone_t *nanozone, void *ptr)
-{
- if (!ptr) {
- return; // Protect against malloc_zone_free() passing NULL.
- }
-
- // <rdar://problem/26481467> exhausting a slot may result in a pointer with
- // the nanozone prefix being given to nano_free via malloc_zone_free. Calling
- // vet_and_size here, instead of in _nano_free_check_scribble means we can
- // early-out into the helper_zone if it turns out nano does not own this ptr.
- size_t sz = _nano_vet_and_size_of_live(nanozone, ptr);
-
- if (sz) {
- /* NOTHING. Drop it on the floor as nanozone metadata could be fouled by fork. */
- return;
- } else {
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- zone->free(zone, ptr);
- return;
- }
- /* NOTREACHED */
-}
-
-static void
-nano_forked_free_definite_size(nanozone_t *nanozone, void *ptr, size_t size)
-{
- nano_forked_free(nanozone, ptr);
-}
-
-static void
-nano_free_scribble(nanozone_t *nanozone, void *ptr)
-{
- __nano_free(nanozone, ptr, 1);
-}
-
-static size_t
-nano_size(nanozone_t *nanozone, const void *ptr)
-{
- nano_blk_addr_t p; // happily, the compiler holds this in a register
-
- p.addr = (uint64_t)ptr; // place ptr on the dissecting table
-
- if (NANOZONE_SIGNATURE == p.fields.nano_signature) { // Our signature?
- return _nano_size(nanozone, ptr);
- } else {
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->size(zone, ptr); // Not nano. Try other sizes.
- }
- /* NOTREACHED */
-}
-
-static void *
-nano_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
-{
- // could occur through malloc_zone_realloc() path
- if (!ptr) {
- // If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
- return nano_malloc(nanozone, new_size);
- }
-
- size_t old_size = _nano_vet_and_size_of_live(nanozone, ptr);
- if (!old_size) {
- // not-nano pointer, hand down to helper zone
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->realloc(zone, ptr, new_size);
- } else {
- if (new_size <= NANO_MAX_SIZE) {
- // nano to nano?
- void *q = _nano_realloc(nanozone, ptr, new_size);
- if (q) {
- return q;
- } else {
- // nano exhausted
- /* FALLTHROUGH to helper zone copying case */
- }
- }
-
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- void *new_ptr = zone->malloc(zone, new_size);
-
- if (new_ptr) {
- size_t valid_size = MIN(old_size, new_size);
- memcpy(new_ptr, ptr, valid_size);
- _nano_free_check_scribble(nanozone, ptr, (nanozone->debug_flags & MALLOC_DO_SCRIBBLE));
- return new_ptr;
- } else {
- /* Original ptr is left intact */
- return NULL;
- }
- /* NOTREACHED */
- }
- /* NOTREACHED */
-}
-
-static void *
-nano_forked_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
-{
- // could occur through malloc_zone_realloc() path
- if (!ptr) {
- // If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
- return nano_forked_malloc(nanozone, new_size);
- }
-
- size_t old_size = _nano_vet_and_size_of_live(nanozone, ptr);
- if (!old_size) {
- // not-nano pointer, hand down to helper zone
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->realloc(zone, ptr, new_size);
- } else {
- if (0 == new_size) {
- // If size is 0 and ptr is not a null pointer, the object pointed to is freed.
- // However as nanozone metadata could be fouled by fork, we'll intentionally leak it.
-
- // If size is 0, either a null pointer or a unique pointer that can be successfully passed
- // to free() shall be returned.
- return nano_forked_malloc(nanozone, 1);
- }
-
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- void *new_ptr = zone->malloc(zone, new_size);
-
- if (new_ptr) {
- size_t valid_size = MIN(old_size, new_size);
- memcpy(new_ptr, ptr, valid_size);
- /* Original pointer is intentionally leaked as nanozone metadata could be fouled by fork. */
- return new_ptr;
- } else {
- /* Original ptr is left intact */
- return NULL;
- }
- /* NOTREACHED */
- }
- /* NOTREACHED */
-}
-
-static void
-nano_destroy(nanozone_t *nanozone)
-{
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- zone->destroy(zone);
-
- _nano_destroy(nanozone);
-}
-
-static unsigned
-nano_batch_malloc(nanozone_t *nanozone, size_t size, void **results, unsigned count)
-{
- unsigned found = 0;
-
- if (size <= NANO_MAX_SIZE) {
- while (found < count) {
- void *ptr = _nano_malloc_check_clear(nanozone, size, 0);
- if (!ptr) {
- break;
- }
-
- *results++ = ptr;
- found++;
- }
- if (found == count) {
- return found;
- } else {
- /* FALLTHROUGH to mop-up in the helper zone */
- }
- }
-
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return found + zone->batch_malloc(zone, size, results, count - found);
-}
-
-static unsigned
-nano_forked_batch_malloc(nanozone_t *nanozone, size_t size, void **results, unsigned count)
-{
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->batch_malloc(zone, size, results, count);
-}
-
-static void
-nano_batch_free(nanozone_t *nanozone, void **to_be_freed, unsigned count)
-{
- void *ptr;
-
- // frees all the pointers in to_be_freed
- // note that to_be_freed may be overwritten during the process
- if (!count) {
- return;
- }
-
- while (count--) {
- ptr = to_be_freed[count];
- if (ptr) {
- nano_free(nanozone, ptr);
- }
- }
-}
-
-static void
-nano_forked_batch_free(nanozone_t *nanozone, void **to_be_freed, unsigned count)
-{
- void *ptr;
-
- // frees all the pointers in to_be_freed
- // note that to_be_freed may be overwritten during the process
- if (!count) {
- return;
- }
-
- while (count--) {
- ptr = to_be_freed[count];
- if (ptr) {
- nano_forked_free(nanozone, ptr);
- }
- }
-}
-
-static void *
-nano_memalign(nanozone_t *nanozone, size_t alignment, size_t size)
-{
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->memalign(zone, alignment, size);
-}
-
-static boolean_t
-nano_claimed_address(nanozone_t *nanozone, void *ptr)
-{
- nano_blk_addr_t p;
- p.addr = (uint64_t)ptr;
- if (NANOZONE_SIGNATURE != p.fields.nano_signature) {
- // Not a nano address - let the helper zone handle it.
- malloc_zone_t *helper_zone = nanozone->helper_zone;
- return malloc_zone_claimed_address(helper_zone, ptr);
- }
- return __nano_vet_and_size_inner(nanozone, ptr, true) != 0;
-}
-
-static boolean_t
-nano_forked_claimed_address(struct _malloc_zone_t *zone, void *ptr)
-{
- // This does not operate after fork - default to true to avoid
- // false negatives.
- return true;
-}
-
-static size_t
-nano_try_madvise(nanozone_t *nanozone, size_t goal)
-{
- unsigned int mag_index, slot_key;
- size_t bytes_toward_goal = 0;
-
- for (mag_index = 0; mag_index < nano_common_max_magazines; mag_index++) {
- nano_blk_addr_t p;
-
- // Establish p as base address for band 0, slot 0, offset 0
- p.fields.nano_signature = NANOZONE_SIGNATURE;
- p.fields.nano_mag_index = mag_index;
- p.fields.nano_band = 0;
- p.fields.nano_slot = 0;
- p.fields.nano_offset = 0;
-
- for (slot_key = 0; slot_key < SLOT_KEY_LIMIT; p.addr += SLOT_IN_BAND_SIZE, // Advance to next slot base
- slot_key++) {
- // malloc_report(ASL_LEVEL_WARNING,"nano_try_madvise examining slot base %p\n", p.addr);
- nano_meta_admin_t pMeta = &(nanozone->meta_data[mag_index][slot_key]);
- uintptr_t slot_bump_addr = pMeta->slot_bump_addr; // capture this volatile pointer
- size_t slot_objects_mapped = pMeta->slot_objects_mapped; // capture this volatile count
-
- if (0 == slot_objects_mapped) { // Nothing allocated in this magazine for this slot?
- continue;
- } else {
- // Walk the slot free list and populate a bitarray_t
- int log_size = 64 - __builtin_clzl(slot_objects_mapped);
- bitarray_t slot_bitarray = bitarray_create(log_size);
-
- unsigned int slot_bytes = pMeta->slot_bytes;
- int log_page_count = 64 - __builtin_clzl((slot_objects_mapped * slot_bytes) / vm_kernel_page_size);
- log_page_count = 1 + MAX(0, log_page_count);
- bitarray_t page_bitarray = bitarray_create(log_page_count);
-
- // malloc_report(ASL_LEVEL_WARNING,"slot_bitarray: %db page_bitarray: %db\n", bitarray_size(log_size),
- // bitarray_size(log_page_count));
- if (!slot_bitarray) {
- malloc_report(ASL_LEVEL_ERR, "bitarray_create(%d) in nano_try_madvise returned errno=%d.\n", log_size, errno);
- free(page_bitarray);
- return bytes_toward_goal;
- }
-
- if (!page_bitarray) {
- malloc_report(ASL_LEVEL_ERR, "bitarray_create(%d) in nano_try_madvise returned errno=%d.\n", log_page_count, errno);
- free(slot_bitarray);
- return bytes_toward_goal;
- }
-
- chained_block_t head = NULL, tail = NULL, t;
- unsigned stoploss = (unsigned)slot_objects_mapped;
- while ((t = OSAtomicDequeue(&(pMeta->slot_LIFO), offsetof(struct chained_block_s, next)))) {
- if (0 == stoploss) {
- malloc_report(ASL_LEVEL_ERR, "Free list walk in nano_try_madvise exceeded object count.\n");
- break;
- }
- stoploss--;
-
- uintptr_t offset = ((uintptr_t)t - p.addr); // offset from beginning of slot
- index_t block_index = offset_to_index(nanozone, pMeta, offset);
-
- // build a simple linked list of the free blocks we're able to obtain
- if (NULL == head) {
- head = t;
- } else {
- tail->next = t;
- }
- tail = t;
-
- // take note in a bitarray_t of each free block we're able to obtain (allows fast lookup below)
- if (block_index < slot_objects_mapped) {
- bitarray_set(slot_bitarray, log_size, block_index);
- }
- }
- if (tail) {
- tail->next = NULL;
- }
-
- if (NULL == head) {
- free(slot_bitarray);
- free(page_bitarray);
- continue;
- }
-
- index_t i;
- nano_blk_addr_t q;
- size_t pgnum;
- for (i = (index_t)pMeta->slot_objects_skipped; i < slot_objects_mapped; ++i) {
- uintptr_t block_offset = index_to_offset(nanozone, pMeta, i);
- if (p.addr + block_offset >= slot_bump_addr) {
- break;
- }
-
- if (!bitarray_get(slot_bitarray, log_size, i)) { // is block i allocated or already on an madvise'd page?
-
- // Mark the page(s) it resides on as live
- q.addr = p.addr + block_offset;
- pgnum = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >>
- vm_kernel_page_shift;
- bitarray_set(page_bitarray, log_page_count, (index_t)pgnum);
-
- q.addr += slot_bytes - 1;
- pgnum = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >>
- vm_kernel_page_shift;
- bitarray_set(page_bitarray, log_page_count, (index_t)pgnum);
- }
- }
-
- free(slot_bitarray);
-
- q.addr = p.addr + index_to_offset(nanozone, pMeta, (index_t)pMeta->slot_objects_skipped);
- index_t pgstart =
- ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >> vm_kernel_page_shift;
-
- q.addr = slot_bump_addr - slot_bytes;
- pgnum = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >> vm_kernel_page_shift;
-
- // malloc_report(ASL_LEVEL_WARNING,"Examining %d pages. Slot base %p.\n", pgnum - pgstart + 1, p.addr);
-
- if (pMeta->slot_madvised_pages) {
- if (pMeta->slot_madvised_log_page_count < log_page_count) {
- bitarray_t new_madvised_pages = bitarray_create(log_page_count);
- index_t index;
- while (bitarray_zap_first_set(pMeta->slot_madvised_pages, pMeta->slot_madvised_log_page_count, &index)) {
- bitarray_set(new_madvised_pages, log_page_count, index);
- }
- free(pMeta->slot_madvised_pages);
- pMeta->slot_madvised_pages = new_madvised_pages;
- pMeta->slot_madvised_log_page_count = log_page_count;
- }
- } else {
- pMeta->slot_madvised_pages = bitarray_create(log_page_count);
- pMeta->slot_madvised_log_page_count = log_page_count;
- }
-
- bitarray_t will_madvise_pages = bitarray_create(log_page_count);
- int num_advised = 0;
-
- for (i = pgstart; i < pgnum; ++i) {
- if ((i < (1 << log_page_count)) && // bounds check for the bitarray_get()'s that follow.
- !bitarray_get(pMeta->slot_madvised_pages, log_page_count, i) && // already madvise'd?
- !bitarray_get(page_bitarray, log_page_count, i)) // no live allocations?
- {
- num_advised++;
- bitarray_set(will_madvise_pages, log_page_count, i);
- }
- }
- free(page_bitarray);
-
- if (num_advised) {
- chained_block_t new_head = NULL, new_tail = NULL;
- // malloc_report(ASL_LEVEL_WARNING,"Constructing residual free list starting at %p num_advised %d\n", head,
- // num_advised);
- t = head;
- while (t) {
- q.addr = (uintptr_t)t;
- index_t pgnum_start =
- ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >>
- vm_kernel_page_shift;
- q.addr += slot_bytes - 1;
- index_t pgnum_end =
- ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >>
- vm_kernel_page_shift;
-
- // bounds check for the bitarray_get()'s that follow. If the pgnum is beyond the
- // capacity of the will_madvise_pages just restore the block to the free list.
- if (pgnum_start >= (1 << log_page_count)) {
- if (NULL == new_head) {
- new_head = t;
- } else {
- new_tail->next = t;
- }
- new_tail = t;
- }
- // If the block nowhere lies on an madvise()'d page restore it to the slot free list.
- else if (!bitarray_get(will_madvise_pages, log_page_count, pgnum_start) &&
- !bitarray_get(will_madvise_pages, log_page_count, pgnum_end)) {
- if (NULL == new_head) {
- new_head = t;
- } else {
- new_tail->next = t;
- }
- new_tail = t;
- }
-
- t = t->next;
- }
- if (new_tail) {
- new_tail->next = NULL;
- }
-
- // push the free list extracted above back onto the LIFO, all at once
- if (new_head) {
- OSAtomicEnqueue(&(pMeta->slot_LIFO), new_head,
- (uintptr_t)new_tail - (uintptr_t)new_head + offsetof(struct chained_block_s, next));
- }
- } else {
- // malloc_report(ASL_LEVEL_WARNING,"Reinstating free list since no pages were madvised (%d).\n", num_advised);
- if (head) {
- OSAtomicEnqueue(&(pMeta->slot_LIFO), head,
- (uintptr_t)tail - (uintptr_t)head + offsetof(struct chained_block_s, next));
- }
- }
-
- for (i = pgstart; i < pgnum; ++i) {
- if ((i < (1 << log_page_count)) && bitarray_get(will_madvise_pages, log_page_count, i)) {
- q = p;
- q.fields.nano_band = (i << vm_kernel_page_shift) >> NANO_OFFSET_BITS;
- q.fields.nano_offset = (i << vm_kernel_page_shift) & ((1 << NANO_OFFSET_BITS) - 1);
- // malloc_report(ASL_LEVEL_WARNING,"Entire page non-live: %d. Slot base %p, madvising %p\n", i, p.addr,
- // q.addr);
-
- if (nanozone->debug_flags & MALLOC_DO_SCRIBBLE) {
- memset((void *)q.addr, SCRUBBLE_BYTE, vm_kernel_page_size);
- }
-
- if (-1 == madvise((void *)q.addr, vm_kernel_page_size, MADV_FREE_REUSABLE))
- {
- /* -1 return: VM map entry change makes this unfit for reuse. Something evil lurks. */
-#if DEBUG_MADVISE
- nanozone_error(nanozone, 0, "madvise(..., MADV_FREE_REUSABLE) failed", (void *)cwq.addrpgLo,
- "length=%d\n", vm_page_size);
-#endif
- } else {
- bytes_toward_goal += vm_kernel_page_size;
- bitarray_set(pMeta->slot_madvised_pages, log_page_count, i);
- }
- }
- }
- free(will_madvise_pages);
-
- if (!bitarray_first_set(pMeta->slot_madvised_pages, log_page_count)) {
- free(pMeta->slot_madvised_pages);
- pMeta->slot_madvised_pages = NULL;
- pMeta->slot_madvised_log_page_count = 0;
- }
-
- if (goal && bytes_toward_goal >= goal) {
- return bytes_toward_goal;
- }
- }
- }
- }
- return bytes_toward_goal;
-}
-
-static size_t
-nano_pressure_relief(nanozone_t *nanozone, size_t goal)
-{
- MAGMALLOC_PRESSURERELIEFBEGIN((void *)nanozone, nanozone->basic_zone.zone_name, (int)goal);
- MALLOC_TRACE(TRACE_nano_memory_pressure | DBG_FUNC_START, (uint64_t)nanozone, goal, 0, 0);
-
- size_t total = nano_try_madvise(nanozone, goal);
-
- MAGMALLOC_PRESSURERELIEFEND((void *)nanozone, nanozone->basic_zone.zone_name, (int)goal, (int)total);
- MALLOC_TRACE(TRACE_nano_memory_pressure | DBG_FUNC_END, (uint64_t)nanozone, goal, total, 0);
-
- return total;
-}
-
-/**************** introspection methods *********************/
-
-static kern_return_t
-nano_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)
-{
- nanozone_t *nanozone;
- kern_return_t err;
- struct nanozone_s zone_copy;
-
- if (!reader) {
- reader = nano_common_default_reader;
- }
-
- err = reader(task, zone_address, sizeof(nanozone_t), (void **)&nanozone);
- if (err) {
- return err;
- }
- memcpy(&zone_copy, nanozone, sizeof(zone_copy));
-
- err = segregated_in_use_enumerator(task, context, type_mask, &zone_copy, reader, recorder);
- return err;
-}
-
-static size_t
-nano_good_size(nanozone_t *nanozone, size_t size)
-{
- if (size <= NANO_MAX_SIZE) {
- return _nano_common_good_size(size);
- } else {
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->introspect->good_size(zone, size);
- }
-}
-
-// TODO sanity checks
-static unsigned nanozone_check_counter = 0;
-static unsigned nanozone_check_start = 0;
-static unsigned nanozone_check_modulo = 1;
-
-static boolean_t
-nano_check_all(nanozone_t *nanozone, const char *function)
-{
- return 1;
-}
-
-static boolean_t
-nanozone_check(nanozone_t *nanozone)
-{
- if ((++nanozone_check_counter % 10000) == 0) {
- malloc_report(ASL_LEVEL_NOTICE, "at nanozone_check counter=%d\n", nanozone_check_counter);
- }
-
- if (nanozone_check_counter < nanozone_check_start) {
- return 1;
- }
-
- if (nanozone_check_counter % nanozone_check_modulo) {
- return 1;
- }
-
- return nano_check_all(nanozone, "");
-}
-
-static unsigned
-count_free(nanozone_t *nanozone, nano_meta_admin_t pMeta)
-{
- chained_block_t head = NULL, tail = NULL, t;
- unsigned count = 0;
-
- unsigned stoploss = (unsigned)pMeta->slot_objects_mapped;
- while ((t = OSAtomicDequeue(&(pMeta->slot_LIFO), offsetof(struct chained_block_s, next)))) {
- if (0 == stoploss) {
- malloc_zone_error(nanozone->debug_flags, true,
- "Free list walk in count_free exceeded object count.\n",
- (void *)&(pMeta->slot_LIFO), NULL);
- }
- stoploss--;
-
- if (NULL == head) {
- head = t;
- } else {
- tail->next = t;
- }
- tail = t;
-
- count++;
- }
- if (tail) {
- tail->next = NULL;
- }
-
- // push the free list extracted above back onto the LIFO, all at once
- if (head) {
- OSAtomicEnqueue(&(pMeta->slot_LIFO), head, (uintptr_t)tail - (uintptr_t)head + offsetof(struct chained_block_s, next));
- }
-
- return count;
-}
-
-static void
-nano_print(nanozone_t *nanozone, boolean_t verbose)
-{
- unsigned int mag_index, slot_key;
- malloc_statistics_t stats;
-
- nano_statistics(nanozone, &stats);
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX,
- "Nanozone %p: inUse=%d(%lluKB) touched=%lluKB allocated=%lluMB\n",
- nanozone, stats.blocks_in_use, (uint64_t)stats.size_in_use >> 10,
- (uint64_t)stats.max_size_in_use >> 10, (uint64_t)stats.size_allocated >> 20);
-
- for (mag_index = 0; mag_index < nano_common_max_magazines; mag_index++) {
- nano_blk_addr_t p;
-
- // Establish p as base address for band 0, slot 0, offset 0
- p.fields.nano_signature = NANOZONE_SIGNATURE;
- p.fields.nano_mag_index = mag_index;
- p.fields.nano_band = 0;
- p.fields.nano_slot = 0;
- p.fields.nano_offset = 0;
-
- for (slot_key = 0; slot_key < SLOT_KEY_LIMIT; p.addr += SLOT_IN_BAND_SIZE, // Advance to next slot base
- slot_key++) {
- nano_meta_admin_t pMeta = &(nanozone->meta_data[mag_index][slot_key]);
- uintptr_t slot_bump_addr = pMeta->slot_bump_addr; // capture this volatile pointer
- size_t slot_objects_mapped = pMeta->slot_objects_mapped; // capture this volatile count
-
- if (0 == slot_objects_mapped) { // Nothing allocated in this magazine for this slot?
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX, "Magazine %2d(%3d) Unrealized\n", mag_index,
- (slot_key + 1) << SHIFT_NANO_QUANTUM);
- continue;
- }
-
- uintptr_t offset = (0 == slot_bump_addr ? 0 : slot_bump_addr - p.addr);
- unsigned blocks_touched = offset_to_index(nanozone, pMeta, offset) - (unsigned)pMeta->slot_objects_skipped;
- unsigned blocks_now_free = count_free(nanozone, pMeta);
- unsigned blocks_in_use = blocks_touched - blocks_now_free;
-
- size_t size_hiwater = ((slot_key + 1) << SHIFT_NANO_QUANTUM) * blocks_touched;
- size_t size_in_use = ((slot_key + 1) << SHIFT_NANO_QUANTUM) * blocks_in_use;
- size_t size_allocated = ((offset / BAND_SIZE) + 1) * SLOT_IN_BAND_SIZE;
-
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX,
- "Magazine %2d(%3d) [%p, %3lluKB] \t Allocations in use=%4d \t Bytes in use=%llub \t Untouched=%lluKB\n", mag_index,
- (slot_key + 1) << SHIFT_NANO_QUANTUM, (void *)p.addr, (uint64_t)(size_allocated >> 10), blocks_in_use, (uint64_t)size_in_use,
- (uint64_t)((size_allocated - size_hiwater) >> 10));
-
- if (!verbose) {
- continue;
- } else {
- // Walk the slot free list and populate a bitarray_t
- int log_size = 64 - __builtin_clzl(slot_objects_mapped);
- bitarray_t slot_bitarray = bitarray_create(log_size);
-
- if (!slot_bitarray) {
- malloc_report(ASL_LEVEL_ERR, "bitarray_create(%d) in nano_print returned errno=%d.\n", log_size, errno);
- return;
- }
-
- chained_block_t head = NULL, tail = NULL, t;
- unsigned stoploss = (unsigned)slot_objects_mapped;
- while ((t = OSAtomicDequeue(&(pMeta->slot_LIFO), offsetof(struct chained_block_s, next)))) {
- if (0 == stoploss) {
- malloc_report(ASL_LEVEL_ERR, "Free list walk in nano_print exceeded object count.\n");
- break;
- }
- stoploss--;
-
- uintptr_t offset = ((uintptr_t)t - p.addr); // offset from beginning of slot
- index_t block_index = offset_to_index(nanozone, pMeta, offset);
-
- if (NULL == head) {
- head = t;
- } else {
- tail->next = t;
- }
- tail = t;
-
- if (block_index < slot_objects_mapped) {
- bitarray_set(slot_bitarray, log_size, block_index);
- }
- }
- if (tail) {
- tail->next = NULL;
- }
-
- index_t i;
- for (i = 0; i < slot_objects_mapped; ++i) {
- nano_blk_addr_t q;
- size_t pgnum;
- uintptr_t block_offset = index_to_offset(nanozone, pMeta, i);
- if (p.addr + block_offset >= slot_bump_addr) {
- break;
- }
-
- q.addr = p.addr + block_offset;
- pgnum = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >>
- vm_kernel_page_shift;
-
- if (i < pMeta->slot_objects_skipped) {
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX, "_");
- } else if (bitarray_get(slot_bitarray, log_size, i)) {
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX, "F");
- } else if (pMeta->slot_madvised_pages && (pgnum < (1 << pMeta->slot_madvised_log_page_count)) &&
- bitarray_get(pMeta->slot_madvised_pages, pMeta->slot_madvised_log_page_count, (index_t)pgnum)) {
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX, "M");
- } else {
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX, ".");
- }
- }
- malloc_report(MALLOC_REPORT_NOLOG | MALLOC_REPORT_NOPREFIX, "\n");
-
- free(slot_bitarray);
-
- // push the free list extracted above back onto the LIFO, all at once
- if (head) {
- OSAtomicEnqueue(
- &(pMeta->slot_LIFO), head, (uintptr_t)tail - (uintptr_t)head + offsetof(struct chained_block_s, next));
- }
- }
- }
- }
- return;
-}
-
-static void
-nano_log(malloc_zone_t *zone, void *log_address)
-{
-}
-
-static void
-nano_force_lock(nanozone_t *nanozone)
-{
- int i;
-
- for (i = 0; i < nano_common_max_magazines; ++i) {
- _malloc_lock_lock(&nanozone->band_resupply_lock[i]);
- }
-}
-
-static void
-nano_force_unlock(nanozone_t *nanozone)
-{
- int i;
-
- for (i = 0; i < nano_common_max_magazines; ++i) {
- _malloc_lock_unlock(&nanozone->band_resupply_lock[i]);
- }
-}
-
-static void
-nano_reinit_lock(nanozone_t *nanozone)
-{
- int i;
-
- for (i = 0; i < nano_common_max_magazines; ++i) {
- _malloc_lock_init(&nanozone->band_resupply_lock[i]);
- }
-}
-
-static void
-nano_statistics(nanozone_t *nanozone, malloc_statistics_t *stats)
-{
- int i, j;
-
- bzero(stats, sizeof(*stats));
-
- for (i = 0; i < nano_common_max_magazines; ++i) {
- nano_blk_addr_t p;
-
- // Establish p as base address for slot 0 in this CPU magazine
- p.fields.nano_signature = NANOZONE_SIGNATURE;
- p.fields.nano_mag_index = i;
- p.fields.nano_band = 0;
- p.fields.nano_slot = 0;
- p.fields.nano_offset = 0;
-
- for (j = 0; j < NANO_SLOT_SIZE; p.addr += SLOT_IN_BAND_SIZE, // Advance to next slot base
- ++j) {
- nano_meta_admin_t pMeta = &nanozone->meta_data[i][j];
- uintptr_t offset = pMeta->slot_bump_addr - p.addr;
-
- if (0 == pMeta->slot_current_base_addr) { // Nothing allocated in this magazine for this slot?
- continue;
- } else {
- unsigned blocks_touched = offset_to_index(nanozone, pMeta, offset) - (unsigned)pMeta->slot_objects_skipped;
- unsigned blocks_now_free = count_free(nanozone, pMeta);
- unsigned blocks_in_use = blocks_touched - blocks_now_free;
-
- size_t size_hiwater = ((j + 1) << SHIFT_NANO_QUANTUM) * blocks_touched;
- size_t size_in_use = ((j + 1) << SHIFT_NANO_QUANTUM) * blocks_in_use;
- size_t size_allocated = ((offset / BAND_SIZE) + 1) * SLOT_IN_BAND_SIZE;
-
- stats->blocks_in_use += blocks_in_use;
-
- stats->max_size_in_use += size_hiwater;
- stats->size_in_use += size_in_use;
- stats->size_allocated += size_allocated;
- }
- }
- }
-}
-
-static boolean_t
-_nano_locked(nanozone_t *nanozone)
-{
- int i;
-
- for (i = 0; i < nano_common_max_magazines; ++i) {
- if (_malloc_lock_trylock(&nanozone->band_resupply_lock[i])) {
- _malloc_lock_unlock(&nanozone->band_resupply_lock[i]);
- return TRUE;
- }
- }
- return FALSE;
-}
-
-static boolean_t
-nano_locked(nanozone_t *nanozone)
-{
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
-
- return _nano_locked(nanozone) || zone->introspect->zone_locked(zone);
-}
-
-static const struct malloc_introspection_t nano_introspect = {
- (void *)nano_ptr_in_use_enumerator, (void *)nano_good_size, (void *)nanozone_check, (void *)nano_print, nano_log,
- (void *)nano_force_lock, (void *)nano_force_unlock, (void *)nano_statistics, (void *)nano_locked, NULL, NULL, NULL,
- NULL, /* Zone enumeration version 7 and forward. */
- (void *)nano_reinit_lock, // reinit_lock version 9 and foward
-}; // marked as const to spare the DATA section
-
-void
-nano_forked_zone(nanozone_t *nanozone)
-{
- /*
- * Hobble the nano zone in the child of a fork prior to an exec since
- * the state of the zone can be made inconsistent by a parent thread while the
- * fork is underway.
- * All new allocations will be referred to the helper zone (which is more stable.)
- * All free()'s of existing nano objects will be leaked.
- */
-
- mprotect(nanozone, sizeof(nanozone->basic_zone), PROT_READ | PROT_WRITE);
-
- nanozone->basic_zone.size = (void *)nano_size; /* Unchanged. */
- nanozone->basic_zone.malloc = (void *)nano_forked_malloc;
- nanozone->basic_zone.calloc = (void *)nano_forked_calloc;
- nanozone->basic_zone.valloc = (void *)nano_valloc; /* Unchanged, already always obtained from helper zone. */
- nanozone->basic_zone.free = (void *)nano_forked_free;
- nanozone->basic_zone.realloc = (void *)nano_forked_realloc;
- nanozone->basic_zone.destroy = (void *)nano_destroy; /* Unchanged. */
- nanozone->basic_zone.batch_malloc = (void *)nano_forked_batch_malloc;
- nanozone->basic_zone.batch_free = (void *)nano_forked_batch_free;
- nanozone->basic_zone.introspect = (struct malloc_introspection_t *)&nano_introspect; /* Unchanged. */
- nanozone->basic_zone.memalign = (void *)nano_memalign; /* Unchanged. */
- nanozone->basic_zone.free_definite_size = (void *)nano_forked_free_definite_size;
- nanozone->basic_zone.claimed_address = nano_forked_claimed_address;
-
- mprotect(nanozone, sizeof(nanozone->basic_zone), PROT_READ);
-}
-
-malloc_zone_t *
-nano_create_zone(malloc_zone_t *helper_zone, unsigned debug_flags)
-{
- nanozone_t *nanozone;
- int i, j;
-
- /* Note: It is important that nano_create_zone resets _malloc_engaged_nano
- * if it is unable to enable the nanozone (and chooses not to abort). As
- * several functions rely on _malloc_engaged_nano to determine if they
- * should manipulate the nanozone, and these should not run if we failed
- * to create the zone.
- */
- MALLOC_ASSERT(_malloc_engaged_nano == NANO_V1);
-
- /* get memory for the zone. */
- nanozone = nano_common_allocate_based_pages(NANOZONE_PAGED_SIZE, 0, 0, VM_MEMORY_MALLOC, 0);
- if (!nanozone) {
- _malloc_engaged_nano = NANO_NONE;
- return NULL;
- }
-
- /* set up the basic_zone portion of the nanozone structure */
- nanozone->basic_zone.version = 10;
- nanozone->basic_zone.size = (void *)nano_size;
- nanozone->basic_zone.malloc = (debug_flags & MALLOC_DO_SCRIBBLE) ? (void *)nano_malloc_scribble : (void *)nano_malloc;
- nanozone->basic_zone.calloc = (void *)nano_calloc;
- nanozone->basic_zone.valloc = (void *)nano_valloc;
- nanozone->basic_zone.free = (debug_flags & MALLOC_DO_SCRIBBLE) ? (void *)nano_free_scribble : (void *)nano_free;
- nanozone->basic_zone.realloc = (void *)nano_realloc;
- nanozone->basic_zone.destroy = (void *)nano_destroy;
- nanozone->basic_zone.batch_malloc = (void *)nano_batch_malloc;
- nanozone->basic_zone.batch_free = (void *)nano_batch_free;
- nanozone->basic_zone.introspect = (struct malloc_introspection_t *)&nano_introspect;
- nanozone->basic_zone.memalign = (void *)nano_memalign;
- nanozone->basic_zone.free_definite_size = (debug_flags & MALLOC_DO_SCRIBBLE) ? (void *)nano_free_definite_size_scribble
- : (void *)nano_free_definite_size;
-
- nanozone->basic_zone.pressure_relief = (void *)nano_pressure_relief;
- nanozone->basic_zone.claimed_address = (void *)nano_claimed_address;
-
- nanozone->basic_zone.reserved1 = 0; /* Set to zero once and for all as required by CFAllocator. */
- nanozone->basic_zone.reserved2 = 0; /* Set to zero once and for all as required by CFAllocator. */
-
- mprotect(nanozone, sizeof(nanozone->basic_zone), PROT_READ); /* Prevent overwriting the function pointers in basic_zone. */
-
- /* Nano zone does not support MALLOC_ADD_GUARD_PAGES. */
- if (debug_flags & MALLOC_ALL_GUARD_PAGE_FLAGS) {
- if (!(debug_flags & MALLOC_GUARD_ALL)) {
- // Don't report when MallocGuardEdges == "all".
- malloc_report(ASL_LEVEL_INFO, "nano zone does not support guard pages\n");
- }
- debug_flags &= ~MALLOC_ALL_GUARD_PAGE_FLAGS;
- }
-
- /* set up the remainder of the nanozone structure */
- nanozone->debug_flags = debug_flags;
-
- if (phys_ncpus > sizeof(nanozone->core_mapped_size) /
- sizeof(nanozone->core_mapped_size[0])) {
- MALLOC_REPORT_FATAL_ERROR(phys_ncpus,
- "nanozone abandoned because NCPUS > max magazines.\n");
- }
-
- /* Initialize slot queue heads and resupply locks. */
- OSQueueHead q0 = OS_ATOMIC_QUEUE_INIT;
- for (i = 0; i < nano_common_max_magazines; ++i) {
- _malloc_lock_init(&nanozone->band_resupply_lock[i]);
-
- for (j = 0; j < NANO_SLOT_SIZE; ++j) {
- nanozone->meta_data[i][j].slot_LIFO = q0;
- }
- }
-
- /* Initialize the security token. */
- nanozone->cookie = (uintptr_t)malloc_entropy[0] & 0x0000ffffffff0000ULL; // scramble central 32bits with this cookie
-
- nanozone->helper_zone = helper_zone;
-
- return (malloc_zone_t *)nanozone;
-}
-
-void
-nano_init(const char *envp[], const char *apple[],
- const char *bootargs MALLOC_UNUSED)
-{
-#if NANO_PREALLOCATE_BAND_VM
- // Unconditionally preallocate the VA space set aside for nano malloc to
- // reserve it in all configurations. rdar://problem/33392283
- boolean_t preallocated = nano_preallocate_band_vm();
- if (!preallocated) {
- malloc_report(ASL_LEVEL_NOTICE, "nano zone abandoned due to inability to preallocate reserved vm space.\n");
- _malloc_engaged_nano = NANO_NONE;
- }
-#endif
-}
-
-// Second phase of initialization, called during _malloc_initialize(), after
-// environment variables have been read and processed.
-void
-nano_configure()
-{
- // Nothing to do.
-}
-
-#endif // CONFIG_NANOZONE
-
-/* vim: set noet:ts=4:sw=4:cindent: */