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--- libmalloc/libmalloc-140.40.1/src/nano_malloc.c
+++ /dev/null
@@ -1,2015 +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 ***********************/
-// msg prints after fmt, ...
-static MALLOC_NOINLINE void
-nanozone_error(nanozone_t *nanozone, int is_corruption, const char *msg, const void *ptr, const char *fmt, ...) __printflike(5, 6);
-
-static void nano_statistics(nanozone_t *nanozone, malloc_statistics_t *stats);
-
-/********************* VERY LOW LEVEL UTILITIES ************************/
-// msg prints after fmt, ...
-
-static MALLOC_NOINLINE void
-nanozone_error(nanozone_t *nanozone, int is_corruption, const char *msg, const void *ptr, const char *fmt, ...)
-{
- va_list ap;
- _SIMPLE_STRING b = _simple_salloc();
-
- 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));
- } 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();
-
- // Call abort() if this is a memory corruption error and the abort on
- // corruption flag is set, or if any error should abort.
- if ((is_corruption && (nanozone->debug_flags & MALLOC_ABORT_ON_CORRUPTION)) ||
- (nanozone->debug_flags & MALLOC_ABORT_ON_ERROR)) {
- _os_set_crash_log_message_dynamic(b ? _simple_string(b) : msg);
- abort();
- } else if (b) {
- _simple_sfree(b);
- }
-}
-
-static void *
-allocate_based_pages(nanozone_t *nanozone,
- size_t size,
- unsigned char align,
- unsigned debug_flags,
- int vm_page_label,
- void *base_addr)
-{
- boolean_t add_guard_pages = debug_flags & MALLOC_ADD_GUARD_PAGES;
- mach_vm_address_t vm_addr;
- uintptr_t addr;
- mach_vm_size_t allocation_size = round_page(size);
- mach_vm_offset_t allocation_mask = ((mach_vm_offset_t)1 << align) - 1;
- int alloc_flags = VM_FLAGS_ANYWHERE | VM_MAKE_TAG(vm_page_label);
- kern_return_t kr;
-
- if (!allocation_size) {
- allocation_size = vm_page_size;
- }
- if (add_guard_pages) {
- allocation_size += 2 * vm_page_size;
- }
- if (allocation_size < size) { // size_t arithmetic wrapped!
- return NULL;
- }
-
- vm_addr = round_page((mach_vm_address_t)base_addr);
- if (!vm_addr) {
- vm_addr = vm_page_size;
- }
- kr = mach_vm_map(mach_task_self(), &vm_addr, allocation_size, allocation_mask, alloc_flags, MEMORY_OBJECT_NULL, 0, FALSE,
- VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
- if (kr) {
- nanozone_error(nanozone, 0, "can't allocate pages", NULL, "*** mach_vm_map(size=%lu) failed (error code=%d)\n", size, kr);
- return NULL;
- }
- addr = (uintptr_t)vm_addr;
-
- if (add_guard_pages) {
- addr += vm_page_size;
- mvm_protect((void *)addr, size, PROT_NONE, debug_flags);
- }
- return (void *)addr;
-}
-
-static void *
-nano_allocate_pages(nanozone_t *nanozone, size_t size, unsigned char align, unsigned debug_flags, int vm_page_label)
-{
- return allocate_based_pages(nanozone, size, align, debug_flags, vm_page_label, 0);
-}
-
-static void
-nano_deallocate_pages(nanozone_t *nanozone, void *addr, size_t size, unsigned debug_flags)
-{
- boolean_t add_guard_pages = debug_flags & MALLOC_ADD_GUARD_PAGES;
- mach_vm_address_t vm_addr = (mach_vm_address_t)addr;
- mach_vm_size_t allocation_size = size;
- kern_return_t kr;
-
- if (add_guard_pages) {
- vm_addr -= vm_page_size;
- allocation_size += 2 * vm_page_size;
- }
- kr = mach_vm_deallocate(mach_task_self(), vm_addr, allocation_size);
- if (kr && nanozone) {
- nanozone_error(nanozone, 0, "Can't deallocate_pages at", addr, NULL);
- }
-}
-
-#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
-
- mach_vm_address_t vm_addr = s;
- mach_vm_size_t vm_size = (e - s);
-
- kern_return_t kr = mach_vm_map(mach_task_self(), &vm_addr, vm_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*)s) { // Must get exactly what we asked for
- if (!kr) {
- mach_vm_deallocate(mach_task_self(), vm_addr, vm_size);
- }
- return FALSE;
- }
- return TRUE;
-}
-#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?
- 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;
- _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 < nanozone->phys_ncpus; 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);
-
- while (q.addr < pMeta->slot_limit_addr) {
- // read slot in each remote band. Lands in some random location.
- size_t len = MIN(pMeta->slot_bump_addr - q.addr, SLOT_IN_BAND_SIZE);
- err = reader(task, (vm_address_t)(q.addr + skip_adj), len - skip_adj, (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 - skip_adj);
-
- // 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_printf("Free list walk in segregated_in_use_enumerator exceeded object count.");
- 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)
-
- // 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;
- }
-
- // 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) {
- nanozone_error(
- nanozone, 1, "Free list walk in _nano_block_inuse_p exceeded object count.", (void *)&(pMeta->slot_LIFO), NULL);
- }
- 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(nanozone_t *nanozone, const void *ptr)
-{
- // 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->our_signature != p.fields.nano_signature) {
- return 0;
- }
-
- if (nanozone->phys_ncpus <= p.fields.nano_mag_index) {
- return 0;
- }
-
- if (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 ((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_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 ((((chained_block_t)ptr)->double_free_guard ^ nanozone->cookie) != 0xBADDC0DEDEADBEADULL) {
- 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 ((((chained_block_t)ptr)->double_free_guard ^ nanozone->cookie) == 0xBADDC0DEDEADBEADULL) {
- 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
- unsigned int 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) {
-#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->our_signature != p.fields.nano_signature) {
- nanozone_error(nanozone, 1, "Invalid signature for pointer dequeued from free list", ptr, NULL);
- }
-
- if (mag_index != p.fields.nano_mag_index) {
- nanozone_error(nanozone, 1, "Mismatched magazine for pointer dequeued from free list", ptr, NULL);
- }
-
- gotSize = _nano_vet_and_size_of_free(nanozone, ptr);
- if (0 == gotSize) {
- nanozone_error(nanozone, 1, "Invalid pointer dequeued from free list", ptr, NULL);
- }
- if (gotSize != slot_bytes) {
- nanozone_error(nanozone, 1, "Mismatched size for pointer dequeued from free list", ptr, NULL);
- }
-
- if ((((chained_block_t)ptr)->double_free_guard ^ nanozone->cookie) != 0xBADDC0DEDEADBEADULL) {
- nanozone_error(nanozone, 1, "Heap corruption detected, free list canary is damaged", ptr, NULL);
- }
-#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->our_signature != p.fields.nano_signature) {
- nanozone_error(nanozone, 1, "Invalid next signature for pointer dequeued from free list (showing ptr, next)", ptr,
- ", %p", next);
- }
-
- if (mag_index != p.fields.nano_mag_index) {
- nanozone_error(nanozone, 1, "Mismatched next magazine for pointer dequeued from free list (showing ptr, next)", ptr,
- ", %p", next);
- }
-
- gotSize = _nano_vet_and_size_of_free(nanozone, next);
- if (0 == gotSize) {
- nanozone_error(
- nanozone, 1, "Invalid next for pointer dequeued from free list (showing ptr, next)", ptr, ", %p", next);
- }
- if (gotSize != slot_bytes) {
- nanozone_error(nanozone, 1, "Mismatched next size for pointer dequeued from free list (showing ptr, next)", ptr,
- ", %p", 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);
- }
- ((chained_block_t)ptr)->double_free_guard = (0xBADDC0DEDEADBEADULL ^ nanozone->cookie);
-
- 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 {
- nanozone_error(nanozone, 1, "Freeing unallocated pointer", ptr, NULL);
- }
-}
-
-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) {
- nanozone_error(nanozone, 1, "pointer being reallocated was not allocated", ptr, NULL);
- 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_deallocate_pages(nanozone, (void *)nanozone, NANOZONE_PAGED_SIZE, 0);
-}
-
-/****************** 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 = num_items * size;
-
- // Check for overflow of integer multiplication
- if (num_items > 1) {
- /* size_t is uint64_t */
- if ((num_items | size) & 0xffffffff00000000ul) {
- // num_items or size equals or exceeds sqrt(2^64) == 2^32, appeal to wider arithmetic
- __uint128_t product = ((__uint128_t)num_items) * ((__uint128_t)size);
- if ((uint64_t)(product >> 64)) { // compiles to test on upper register of register pair
- 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->our_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 {
- nanozone_error(nanozone, 1, "Freeing pointer whose size was misdeclared", ptr, NULL);
- }
- } 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->our_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 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 < nanozone->phys_ncpus; 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_printf(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_printf(ASL_LEVEL_WARNING,"slot_bitarray: %db page_bitarray: %db\n", bitarray_size(log_size),
- // bitarray_size(log_page_count));
- if (!slot_bitarray) {
- malloc_printf("bitarray_create(%d) in nano_try_madvise returned errno=%d.", log_size, errno);
- free(page_bitarray);
- return bytes_toward_goal;
- }
-
- if (!page_bitarray) {
- malloc_printf("bitarray_create(%d) in nano_try_madvise returned errno=%d.", 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_printf("Free list walk in nano_try_madvise exceeded object count.");
- 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_printf(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_printf(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_printf(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_printf(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)
-{
- return nano_try_madvise(nanozone, goal);
-}
-
-/**************** introspection methods *********************/
-
-static kern_return_t
-nanozone_default_reader(task_t task, vm_address_t address, vm_size_t size, void **ptr)
-{
- *ptr = (void *)address;
- return 0;
-}
-
-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;
-
- if (!reader) {
- reader = nanozone_default_reader;
- }
-
- err = reader(task, zone_address, sizeof(nanozone_t), (void **)&nanozone);
- if (err) {
- return err;
- }
-
- err = segregated_in_use_enumerator(task, context, type_mask, nanozone, reader, recorder);
- return err;
-}
-
-static size_t
-nano_good_size(nanozone_t *nanozone, size_t size)
-{
- if (size <= NANO_MAX_SIZE) {
- return _nano_good_size(nanozone, size);
- } else {
- malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
- return zone->introspect->good_size(zone, size);
- }
-}
-
-// TODO sanity checks
-unsigned nanozone_check_counter = 0;
-unsigned nanozone_check_start = 0;
-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_printf(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) {
- nanozone_error(nanozone, 1, "Free list walk in count_free exceeded object count.", (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_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "Nanozone %p: inUse=%d(%dKB) touched=%dKB allocated=%dMB\n",
- nanozone, stats.blocks_in_use, stats.size_in_use >> 10, stats.max_size_in_use >> 10, stats.size_allocated >> 20);
-
- for (mag_index = 0; mag_index < nanozone->phys_ncpus; 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_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_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_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX,
- "Magazine %2d(%3d) [%p, %3dKB] \t Allocations in use=%4d \t Bytes in use=%db \t Untouched=%dKB\n", mag_index,
- (slot_key + 1) << SHIFT_NANO_QUANTUM, p, (size_allocated >> 10), blocks_in_use, size_in_use,
- (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_printf("bitarray_create(%d) in nano_print returned errno=%d.", 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_printf("Free list walk in nano_print exceeded object count.");
- 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_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "_");
- } else if (bitarray_get(slot_bitarray, log_size, i)) {
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_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_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, "M");
- } else {
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_NOPREFIX, ".");
- }
- }
- _malloc_printf(MALLOC_PRINTF_NOLOG | MALLOC_PRINTF_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 < nanozone->phys_ncpus; ++i) {
- _malloc_lock_lock(&nanozone->band_resupply_lock[i]);
- }
-}
-
-static void
-nano_force_unlock(nanozone_t *nanozone)
-{
- int i;
-
- for (i = 0; i < nanozone->phys_ncpus; ++i) {
- _malloc_lock_unlock(&nanozone->band_resupply_lock[i]);
- }
-}
-
-static void
-nano_reinit_lock(nanozone_t *nanozone)
-{
- int i;
-
- for (i = 0; i < nanozone->phys_ncpus; ++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 < nanozone->phys_ncpus; ++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 < nanozone->phys_ncpus; ++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;
-
- mprotect(nanozone, sizeof(nanozone->basic_zone), PROT_READ);
-}
-
-malloc_zone_t *
-create_nano_zone(size_t initial_size, malloc_zone_t *helper_zone, unsigned debug_flags)
-{
- nanozone_t *nanozone;
- int i, j;
-
- /* Note: It is important that create_nano_zone clears _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.
- */
- if (!_malloc_engaged_nano) {
- return NULL;
- }
-
- if (_COMM_PAGE_VERSION_REQD > (*((uint16_t *)_COMM_PAGE_VERSION))) {
- MALLOC_PRINTF_FATAL_ERROR((*((uint16_t *)_COMM_PAGE_VERSION)), "comm page version mismatch");
- }
-
- /* get memory for the zone. */
- nanozone = nano_allocate_pages(NULL, NANOZONE_PAGED_SIZE, 0, 0, VM_MEMORY_MALLOC);
- if (!nanozone) {
- _malloc_engaged_nano = false;
- return NULL;
- }
-
- /* set up the basic_zone portion of the nanozone structure */
- nanozone->basic_zone.version = 9;
- 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.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. */
-
- /* set up the remainder of the nanozone structure */
- nanozone->debug_flags = debug_flags;
- nanozone->our_signature = NANOZONE_SIGNATURE;
-
-/* Query the number of configured processors. */
- nanozone->phys_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_PHYSICAL_CPUS;
- nanozone->logical_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_LOGICAL_CPUS;
-
- if (nanozone->phys_ncpus > sizeof(nanozone->core_mapped_size) /
- sizeof(nanozone->core_mapped_size[0])) {
- MALLOC_PRINTF_FATAL_ERROR(nanozone->phys_ncpus,
- "nanozone abandoned because NCPUS > max magazines.\n");
- }
-
- if (0 != (nanozone->logical_ncpus % nanozone->phys_ncpus)) {
- MALLOC_PRINTF_FATAL_ERROR(nanozone->logical_ncpus % nanozone->phys_ncpus,
- "logical_ncpus % phys_ncpus != 0");
- }
-
- switch (nanozone->logical_ncpus / nanozone->phys_ncpus) {
- case 1:
- nanozone->hyper_shift = 0;
- break;
- case 2:
- nanozone->hyper_shift = 1;
- break;
- case 4:
- nanozone->hyper_shift = 2;
- break;
- default:
- MALLOC_PRINTF_FATAL_ERROR(nanozone->logical_ncpus / nanozone->phys_ncpus, "logical_ncpus / phys_ncpus not 1, 2, or 4");
- }
-
- /* Initialize slot queue heads and resupply locks. */
- OSQueueHead q0 = OS_ATOMIC_QUEUE_INIT;
- for (i = 0; i < nanozone->phys_ncpus; ++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. */
- if (0 == _dyld_get_image_slide((const struct mach_header *)_NSGetMachExecuteHeader())) {
- // zero slide when ASLR has been disabled by boot-arg. Eliminate cloaking.
- malloc_entropy[0] = 0;
- malloc_entropy[1] = 0;
- }
- nanozone->cookie = (uintptr_t)malloc_entropy[0] & 0x0000ffffffff0000ULL; // scramble central 32bits with this cookie
-
- /* Nano zone does not support MALLOC_ADD_GUARD_PAGES. */
- if (nanozone->debug_flags & MALLOC_ADD_GUARD_PAGES) {
- _malloc_printf(ASL_LEVEL_INFO, "nano zone does not support guard pages\n");
- nanozone->debug_flags &= ~MALLOC_ADD_GUARD_PAGES;
- }
-
- nanozone->helper_zone = helper_zone;
-
- return (malloc_zone_t *)nanozone;
-}
-
-boolean_t _malloc_engaged_nano;
-
-void
-nano_init(const char *envp[], const char *apple[])
-{
- const char *flag = _simple_getenv(apple, "MallocNanoZone");
- if (flag && flag[0] == '1') {
- _malloc_engaged_nano = 1;
- }
-#if CONFIG_NANO_SMALLMEM_DYNAMIC_DISABLE_35305995
- // Disable nano malloc on <=1gb configurations rdar://problem/35305995
- uint64_t memsize = platform_hw_memsize();
- if (memsize <= (1ull << 30)) {
- _malloc_engaged_nano = 0;
- }
-#endif // CONFIG_NANO_SMALLMEM_DYNAMIC_DISABLE_35305995
- /* Explicit overrides from the environment */
- flag = _simple_getenv(envp, "MallocNanoZone");
- if (flag && flag[0] == '1') {
- _malloc_engaged_nano = 1;
- } else if (flag && flag[0] == '0') {
- _malloc_engaged_nano = 0;
- }
-#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_engaged_nano) {
- _malloc_printf(ASL_LEVEL_NOTICE, "nano zone abandoned due to inability to preallocate reserved vm space.\n");
- _malloc_engaged_nano = 0;
- }
-#endif
-}
-
-#endif // CONFIG_NANOZONE
-
-/* vim: set noet:ts=4:sw=4:cindent: */