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--- /dev/null
+++ libmalloc/libmalloc-67/src/nano_malloc.c
@@ -0,0 +1,2056 @@
+/*
+ * 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@
+ */
+
+#ifdef __LP64__ /* nano_malloc for 64bit ABI */
+#define NDEBUG 1
+#define NANO_FREE_DEQUEUE_DILIGENCE 1 /* Check for corrupt free list */
+
+#include <_simple.h>
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+#include <TargetConditionals.h>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+
+#include <mach/mach.h>
+#include <mach/mach_vm.h>
+
+#include <libkern/OSAtomic.h>
+#include <mach-o/dyld_priv.h> /* for _dyld_get_image_slide() */
+#include <crt_externs.h> /* for _NSGetMachExecuteHeader() */
+
+#include <os/tsd.h>
+
+#if defined(__x86_64__)
+#define __APPLE_API_PRIVATE
+#include <machine/cpu_capabilities.h>
+#define _COMM_PAGE_VERSION_REQD 9
+#undef __APPLE_API_PRIVATE
+#else
+Unknown Architecture
+#endif
+
+#include "scalable_malloc.h"
+#include "malloc_internal.h"
+#include "malloc_printf.h"
+
+#include <CrashReporterClient.h>
+
+#include "bitarray.h"
+
+#ifndef VM_MEMORY_MALLOC_NANO /* Until osfmk/mach/vm_statistics.h is updated in xnu */
+#define VM_MEMORY_MALLOC_NANO 11
+#endif
+
+extern uint64_t malloc_entropy[2];
+/********************* DEFINITIONS ************************/
+
+#define INLINE __inline__
+#define ALWAYSINLINE __attribute__((always_inline))
+#define NOINLINE __attribute__((noinline))
+
+#if defined(__x86_64__)
+#define CACHE_LINE 64
+#define CACHE_ALIGN __attribute__ ((aligned (64) ))
+#else
+#define CACHE_ALIGN /* TBD for other platforms */
+#endif
+
+#define NANO_MAG_INDEX(nz) (_os_cpu_number() >> nz->hyper_shift)
+
+#define SCRIBBLE_BYTE 0xaa /* allocated scribble */
+#define SCRABBLE_BYTE 0x55 /* free()'d scribble */
+#define SCRUBBLE_BYTE 0xdd /* madvise(..., MADV_FREE) scriblle */
+
+#define MAX_RECORDER_BUFFER 256
+
+/************* nanozone address field layout ******************/
+
+#if defined(__x86_64)
+#define NANO_SIGNATURE_BITS 20
+#define NANOZONE_SIGNATURE 0x00006ULL // 0x00006nnnnnnnnnnn the address range devoted to us.
+#define NANO_MAG_BITS 5
+#define NANO_BAND_BITS 18
+#define NANO_SLOT_BITS 4
+#define NANO_OFFSET_BITS 17
+
+#else
+#error Unknown Architecture
+#endif
+
+#if defined(__BIG_ENDIAN__)
+struct nano_blk_addr_s {
+ uint64_t
+nano_signature:NANO_SIGNATURE_BITS, // 0x00006nnnnnnnnnnn the address range devoted to us.
+nano_mag_index:NANO_MAG_BITS, // the core that allocated this block
+nano_band:NANO_BAND_BITS,
+nano_slot:NANO_SLOT_BITS, // bucket of homogenous quanta-multiple blocks
+nano_offset:NANO_OFFSET_BITS; // locates the block
+};
+#else
+// least significant bits declared first
+struct nano_blk_addr_s {
+ uint64_t
+nano_offset:NANO_OFFSET_BITS, // locates the block
+nano_slot:NANO_SLOT_BITS, // bucket of homogenous quanta-multiple blocks
+nano_band:NANO_BAND_BITS,
+nano_mag_index:NANO_MAG_BITS, // the core that allocated this block
+nano_signature:NANO_SIGNATURE_BITS; // 0x00006nnnnnnnnnnn the address range devoted to us.
+};
+#endif
+
+typedef union {
+ uint64_t addr;
+ struct nano_blk_addr_s fields;
+} nano_blk_addr_t;
+
+/* Are we using the nano allocator? Set by the initializer. */
+__attribute__((visibility("hidden")))
+boolean_t _malloc_engaged_nano;
+
+#define NANO_MAX_SIZE 256 /* Buckets sized {16, 32, 48, 64, 80, 96, 112, ...} */
+#define SHIFT_NANO_QUANTUM 4
+#define NANO_REGIME_QUANTA_SIZE (1 << SHIFT_NANO_QUANTUM) // 16
+#define NANO_QUANTA_MASK 0xFULL // NANO_REGIME_QUANTA_SIZE - 1
+
+#define SLOT_IN_BAND_SIZE (1 << NANO_OFFSET_BITS)
+#define SLOT_KEY_LIMIT (1 << NANO_SLOT_BITS) /* Must track nano_slot width */
+#define BAND_SIZE (1 << (NANO_SLOT_BITS + NANO_OFFSET_BITS)) /* == Number of bytes covered by a page table entry */
+#define NANO_MAG_SIZE (1 << NANO_MAG_BITS)
+#define NANO_SLOT_SIZE (1 << NANO_SLOT_BITS)
+
+/****************************** zone itself ***********************************/
+
+/*
+ * Note that objects whose adddress are held in pointers here must be pursued
+ * individually in the nano_in_use_enumeration() routines.
+ */
+
+typedef struct chained_block_s {
+ uintptr_t double_free_guard;
+ struct chained_block_s *next;
+} *chained_block_t;
+
+typedef struct nano_meta_s {
+ OSQueueHead slot_LIFO CACHE_ALIGN;
+ unsigned int slot_madvised_log_page_count;
+ volatile uintptr_t slot_current_base_addr;
+ volatile uintptr_t slot_limit_addr;
+ volatile size_t slot_objects_mapped;
+ volatile size_t slot_objects_skipped;
+ bitarray_t slot_madvised_pages;
+ volatile uintptr_t slot_bump_addr CACHE_ALIGN; // position on cache line distinct from that of slot_LIFO
+ volatile boolean_t slot_exhausted;
+ unsigned int slot_bytes;
+ unsigned int slot_objects;
+} *nano_meta_admin_t;
+
+typedef struct nanozone_s { // vm_allocate()'d, so page-aligned to begin with.
+ malloc_zone_t basic_zone; // first page will be given read-only protection
+ uint8_t pad[PAGE_MAX_SIZE - sizeof(malloc_zone_t)];
+
+ // remainder of structure is R/W (contains no function pointers)
+ // page-aligned
+ struct nano_meta_s meta_data[NANO_MAG_SIZE][NANO_SLOT_SIZE]; // max: NANO_MAG_SIZE cores x NANO_SLOT_SIZE slots for nano blocks {16 .. 256}
+ _malloc_lock_s band_resupply_lock[NANO_MAG_SIZE];
+ uintptr_t band_max_mapped_baseaddr[NANO_MAG_SIZE];
+ size_t core_mapped_size[NANO_MAG_SIZE];
+
+ unsigned debug_flags;
+ unsigned our_signature;
+ unsigned phys_ncpus;
+ unsigned logical_ncpus;
+ unsigned hyper_shift;
+
+ /* security cookie */
+ uintptr_t cookie;
+
+ /*
+ * The nano zone constructed by create_nano_zone() would like to hand off tiny, small, and large
+ * allocations to the default scalable zone. Record the latter as the "helper" zone here.
+ */
+ malloc_zone_t *helper_zone;
+} nanozone_t;
+
+#define SZONE_PAGED_SIZE ((sizeof(nanozone_t) + vm_page_size - 1) & ~ (vm_page_size - 1))
+
+/********************* PROTOTYPES ***********************/
+extern void malloc_error_break(void);
+
+// msg prints after fmt, ...
+static 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 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 & SCALABLE_MALLOC_ABORT_ON_CORRUPTION)) ||
+ (nanozone->debug_flags & SCALABLE_MALLOC_ABORT_ON_ERROR)) {
+ CRSetCrashLogMessage(b ? _simple_string(b) : msg);
+ abort();
+ } else if (b) {
+ _simple_sfree(b);
+ }
+}
+
+static void
+protect(void *address, size_t size, unsigned protection, unsigned debug_flags)
+{
+ kern_return_t err;
+
+ if (!(debug_flags & SCALABLE_MALLOC_DONT_PROTECT_PRELUDE)) {
+ err = mprotect((void *)((uintptr_t)address - vm_page_size), vm_page_size, protection);
+ if (err) {
+ malloc_printf("*** can't protect(%p) region for prelude guard page at %p\n",
+ protection,(uintptr_t)address - (1 << vm_page_shift));
+ }
+ }
+ if (!(debug_flags & SCALABLE_MALLOC_DONT_PROTECT_POSTLUDE)) {
+ err = mprotect((void *)((uintptr_t)address + size), vm_page_size, protection);
+ if (err) {
+ malloc_printf("*** can't protect(%p) region for postlude guard page at %p\n",
+ protection, (uintptr_t)address + size);
+ }
+ }
+}
+
+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 & SCALABLE_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;
+ protect((void *)addr, size, PROT_NONE, debug_flags);
+ }
+ return (void *)addr;
+}
+
+static void *
+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
+deallocate_pages(nanozone_t *nanozone, void *addr, size_t size, unsigned debug_flags)
+{
+ boolean_t add_guard_pages = debug_flags & SCALABLE_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);
+}
+
+/*
+ * 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, unsigned int 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 = 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) {
+ // 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 = (uintptr_t)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;
+ }
+
+ 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 INLINE void *
+segregated_next_block(nanozone_t *nanozone, nano_meta_admin_t pMeta, unsigned int 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 INLINE unsigned int
+segregated_size_to_fit(nanozone_t *nanozone, size_t size, unsigned int *pKey)
+{
+ unsigned int 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 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);
+ return (quo * slot_objects) + (rem / slot_bytes);
+}
+
+static 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, 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, 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 = 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 = 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_page_shift;
+ q.addr += pMeta->slot_bytes - 1;
+ pgnum_end = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >> vm_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 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->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 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 (size && ((((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
+ // ptr is either on a free list (its got the correct canary) in which case return zero, OR
+ // the caller has stored the canary value in the double_free_guard slot entirely by coincidence
+ // and the block is a live allocation. The latter is very unlikely (1 in 2^64) so just return 0.
+ return 0;
+}
+
+static 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 (size && ((((chained_block_t)ptr)->double_free_guard ^ nanozone->cookie) == 0xBADDC0DEDEADBEADULL))
+ return size;
+ else
+ return 0;
+}
+
+static void *
+_nano_malloc_check_clear(nanozone_t *nanozone, size_t size, boolean_t cleared_requested)
+{
+ void *ptr;
+ unsigned int slot_key;
+ unsigned int 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 & SCALABLE_MALLOC_DO_SCRIBBLE) && ptr && size)
+ memset(ptr, SCRIBBLE_BYTE, _nano_vet_and_size_of_live(nanozone, ptr));
+
+ return ptr;
+}
+
+static INLINE 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]);
+
+ if ((void *)(pMeta->slot_bump_addr) <= ptr)
+ return FALSE; // Beyond what's ever been allocated, so trivially not in use.
+
+ // pop elements off the free list all the while looking for ptr.
+ unsigned stoploss = 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 INLINE size_t
+_nano_size(nanozone_t *nanozone, const void *ptr)
+{
+ return _nano_vet_and_size_of_live(nanozone, ptr);
+}
+
+static 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 INLINE void _nano_free_trusted_size_check_scribble(nanozone_t *nanozone, void *ptr, size_t trusted_size, boolean_t do_scribble) ALWAYSINLINE;
+
+static 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 INLINE void _nano_free_check_scribble(nanozone_t *nanozone, void *ptr, boolean_t do_scribble) ALWAYSINLINE;
+
+static 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 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 & SCALABLE_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 & SCALABLE_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 & SCALABLE_MALLOC_DO_SCRIBBLE));
+
+ return new_ptr;
+}
+
+static INLINE void
+_nano_destroy(nanozone_t *nanozone)
+{
+ /* Now destroy the separate nanozone region */
+ deallocate_pages(nanozone, (void *)nanozone, SZONE_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 INLINE void __nano_free_definite_size(nanozone_t *nanozone, void *ptr, size_t size, boolean_t do_scribble) ALWAYSINLINE;
+
+static 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 INLINE void __nano_free(nanozone_t *nanozone, void *ptr, boolean_t do_scribble) ALWAYSINLINE;
+
+static INLINE void
+__nano_free(nanozone_t *nanozone, void *ptr, boolean_t do_scribble)
+{
+ nano_blk_addr_t p; // happily, the compiler holds this in a register
+
+ if (!ptr)
+ return; // Protect against malloc_zone_free() passing NULL.
+
+ p.addr = (uint64_t)ptr; // place ptr on the dissecting table
+ if (nanozone->our_signature == p.fields.nano_signature) {
+ _nano_free_check_scribble(nanozone, ptr, 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)
+{
+ nano_blk_addr_t p; // happily, the compiler holds this in a register
+
+ if (!ptr)
+ return; // Protect against malloc_zone_free() passing NULL.
+
+ p.addr = (uint64_t)ptr; // place ptr on the dissecting table
+ if (nanozone->our_signature == p.fields.nano_signature) {
+ /* 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)
+{
+ 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 (NULL == ptr) { // could occur through malloc_zone_realloc() path
+ // If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
+ return nano_malloc(nanozone, new_size);
+ } else if (nanozone->our_signature == p.fields.nano_signature) { // Our signature?
+ 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 */
+ }
+ }
+
+ // nano to larger-than-nano (or FALLTHROUGH from just above)
+ size_t 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;
+ } else {
+ 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 & SCALABLE_MALLOC_DO_SCRIBBLE));
+ return new_ptr;
+ } else {
+ /* Original ptr is left intact */
+ return NULL;
+ }
+ /* NOTREACHED */
+ }
+ } else {
+ // other-than-nano (not necessarily larger! possibly NULL!) to whatever
+ malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
+
+ return zone->realloc(zone, ptr, new_size);
+ }
+ /* NOTREACHED */
+}
+
+static void *
+nano_forked_realloc(nanozone_t *nanozone, void *ptr, size_t new_size)
+{
+ 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 (NULL == ptr) { // could occur through malloc_zone_realloc() path
+ // If ptr is a null pointer, realloc() shall be equivalent to malloc() for the specified size.
+ return nano_forked_malloc(nanozone, new_size);
+ } else if (nanozone->our_signature == p.fields.nano_signature) { // Our signature?
+ 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);
+ }
+
+ size_t 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;
+ } else {
+ 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 */
+ }
+ } else {
+ // other-than-nano (not necessarily larger! possibly NULL!) to whatever
+ malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
+
+ return zone->realloc(zone, ptr, new_size);
+ }
+ /* 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_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 = 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 = 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_page_shift;
+ bitarray_set(page_bitarray, log_page_count, pgnum);
+
+ q.addr += slot_bytes - 1;
+ pgnum = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >> vm_page_shift;
+ bitarray_set(page_bitarray, log_page_count, pgnum);
+ }
+ }
+
+ free(slot_bitarray);
+
+ q.addr = p.addr + index_to_offset(nanozone, pMeta, pMeta->slot_objects_skipped);
+ index_t pgstart = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >> vm_page_shift;
+
+ q.addr = slot_bump_addr - slot_bytes;
+ pgnum = ((((unsigned)q.fields.nano_band) << NANO_OFFSET_BITS) | ((unsigned)q.fields.nano_offset)) >> vm_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_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_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_page_shift) >> NANO_OFFSET_BITS;
+ q.fields.nano_offset = (i << vm_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 & SCALABLE_MALLOC_DO_SCRIBBLE)
+ memset((void *)q.addr, SCRUBBLE_BYTE, vm_page_size);
+#if TARGET_OS_EMBEDDED
+ if (-1 == madvise((void *)q.addr, vm_page_size, MADV_FREE))
+#else
+ if (-1 == madvise((void *)q.addr, vm_page_size, MADV_FREE_REUSABLE))
+#endif
+ {
+ /* -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_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 = 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) - 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 = 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_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, 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_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) - 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. */
+}; // marked as const to spare the DATA section
+
+__attribute__((visibility("hidden")))
+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);
+
+}
+
+__attribute__((visibility("hidden")))
+malloc_zone_t *
+create_nano_zone(size_t initial_size, malloc_zone_t *helper_zone, unsigned debug_flags)
+{
+ nanozone_t *nanozone;
+ int i, j;
+
+ if (!_malloc_engaged_nano) return NULL;
+
+#if defined(__x86_64__)
+ if (_COMM_PAGE_VERSION_REQD > (*((uint16_t *)_COMM_PAGE_VERSION))) {
+ malloc_printf("*** FATAL ERROR - comm page version mismatch.\n");
+ exit(-1);
+ }
+#endif
+
+ /* get memory for the zone. */
+ nanozone = allocate_pages(NULL, SZONE_PAGED_SIZE, 0, 0, VM_MEMORY_MALLOC);
+ if (!nanozone)
+ return NULL;
+
+ /* set up the basic_zone portion of the nanozone structure */
+ nanozone->basic_zone.version = 8;
+ nanozone->basic_zone.size = (void *)nano_size;
+ nanozone->basic_zone.malloc = (debug_flags & SCALABLE_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 & SCALABLE_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 & SCALABLE_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. */
+#if defined(__x86_64__)
+ nanozone->phys_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_PHYSICAL_CPUS;
+ nanozone->logical_ncpus = *(uint8_t *)(uintptr_t)_COMM_PAGE_LOGICAL_CPUS;
+#else
+#error Unknown architecture
+#endif
+
+ if (nanozone->phys_ncpus > sizeof(nanozone->core_mapped_size)/sizeof(nanozone->core_mapped_size[0])) {
+ _malloc_printf(ASL_LEVEL_NOTICE, "nano zone abandoned because NCPUS mismatch.\n");
+ return NULL;
+ }
+
+ if (0 != (nanozone->logical_ncpus % nanozone->phys_ncpus)) {
+ malloc_printf("*** FATAL ERROR - logical_ncpus % phys_ncpus != 0.\n");
+ exit(-1);
+ }
+
+ 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 - logical_ncpus / phys_ncpus not 1, 2, or 4.\n");
+ exit(-1);
+ }
+
+ /* 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 SCALABLE_MALLOC_ADD_GUARD_PAGES. */
+ if (nanozone->debug_flags & SCALABLE_MALLOC_ADD_GUARD_PAGES) {
+ _malloc_printf(ASL_LEVEL_INFO, "nano zone does not support guard pages\n");
+ nanozone->debug_flags &= ~SCALABLE_MALLOC_ADD_GUARD_PAGES;
+ }
+
+ nanozone->helper_zone = helper_zone;
+
+ return (malloc_zone_t *)nanozone;
+}
+#endif /* defined(__LP64__) */
+
+/* vim: set noet:ts=4:sw=4:cindent: */