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c53e695a6e
In bug 1361258, we unified the initialization sequence on mac, and chose to make the zone registration happen after jemalloc initialization. The order between jemalloc init and zone registration shouldn't actually matter, because jemalloc initializes the first time the allocator is actually used. On the other hand, in some build setups (e.g. with light optimization), the initialization of the thread_arena thread local variable can happen after the forced jemalloc initialization because of the order the corresponding static initializers run. In some levels of optimization, the thread_arena initializer resets the value the jemalloc initialization has set, which subsequently makes choose_arena() return a bogus value (or hit an assertion in ThreadLocal.h on debug builds). So instead of initializing jemalloc from a static initializer, which then registers the zone, we instead register the zone and let jemalloc initialize itself when used, which increases the chances of the thread_arena initializer running first. --HG-- extra : rebase_source : 4d9a5340d097ac8528dc4aaaf0c05bbef40b59bb
433 lines
13 KiB
C
433 lines
13 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozmemory_wrap.h"
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#include <stdlib.h>
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#include <mach/mach_types.h>
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#include "mozilla/Assertions.h"
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/*
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* Malloc implementation functions are MOZ_MEMORY_API, and jemalloc
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* specific functions MOZ_JEMALLOC_API; see mozmemory_wrap.h
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*/
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#define MALLOC_DECL(name, return_type, ...) \
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MOZ_MEMORY_API return_type name ## _impl(__VA_ARGS__);
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#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
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#include "malloc_decls.h"
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#define MALLOC_DECL(name, return_type, ...) \
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MOZ_JEMALLOC_API return_type name ## _impl(__VA_ARGS__);
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#define MALLOC_FUNCS MALLOC_FUNCS_JEMALLOC
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#include "malloc_decls.h"
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/*
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* Definitions of the following structs in malloc/malloc.h might be too old
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* for the built binary to run on newer versions of OSX. So use the newest
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* possible version of those structs.
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*/
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typedef struct _malloc_zone_t {
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void *reserved1;
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void *reserved2;
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size_t (*size)(struct _malloc_zone_t *, const void *);
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void *(*malloc)(struct _malloc_zone_t *, size_t);
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void *(*calloc)(struct _malloc_zone_t *, size_t, size_t);
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void *(*valloc)(struct _malloc_zone_t *, size_t);
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void (*free)(struct _malloc_zone_t *, void *);
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void *(*realloc)(struct _malloc_zone_t *, void *, size_t);
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void (*destroy)(struct _malloc_zone_t *);
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const char *zone_name;
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unsigned (*batch_malloc)(struct _malloc_zone_t *, size_t, void **, unsigned);
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void (*batch_free)(struct _malloc_zone_t *, void **, unsigned);
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struct malloc_introspection_t *introspect;
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unsigned version;
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void *(*memalign)(struct _malloc_zone_t *, size_t, size_t);
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void (*free_definite_size)(struct _malloc_zone_t *, void *, size_t);
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size_t (*pressure_relief)(struct _malloc_zone_t *, size_t);
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} malloc_zone_t;
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typedef struct {
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vm_address_t address;
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vm_size_t size;
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} vm_range_t;
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typedef struct malloc_statistics_t {
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unsigned blocks_in_use;
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size_t size_in_use;
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size_t max_size_in_use;
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size_t size_allocated;
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} malloc_statistics_t;
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typedef kern_return_t memory_reader_t(task_t, vm_address_t, vm_size_t, void **);
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typedef void vm_range_recorder_t(task_t, void *, unsigned type, vm_range_t *, unsigned);
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typedef struct malloc_introspection_t {
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kern_return_t (*enumerator)(task_t, void *, unsigned, vm_address_t, memory_reader_t, vm_range_recorder_t);
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size_t (*good_size)(malloc_zone_t *, size_t);
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boolean_t (*check)(malloc_zone_t *);
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void (*print)(malloc_zone_t *, boolean_t);
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void (*log)(malloc_zone_t *, void *);
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void (*force_lock)(malloc_zone_t *);
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void (*force_unlock)(malloc_zone_t *);
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void (*statistics)(malloc_zone_t *, malloc_statistics_t *);
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boolean_t (*zone_locked)(malloc_zone_t *);
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boolean_t (*enable_discharge_checking)(malloc_zone_t *);
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boolean_t (*disable_discharge_checking)(malloc_zone_t *);
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void (*discharge)(malloc_zone_t *, void *);
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#ifdef __BLOCKS__
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void (*enumerate_discharged_pointers)(malloc_zone_t *, void (^)(void *, void *));
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#else
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void *enumerate_unavailable_without_blocks;
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#endif
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void (*reinit_lock)(malloc_zone_t *);
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} malloc_introspection_t;
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extern kern_return_t malloc_get_all_zones(task_t, memory_reader_t, vm_address_t **, unsigned *);
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extern malloc_zone_t *malloc_default_zone(void);
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extern void malloc_zone_register(malloc_zone_t *zone);
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extern void malloc_zone_unregister(malloc_zone_t *zone);
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extern malloc_zone_t *malloc_default_purgeable_zone(void);
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extern malloc_zone_t* malloc_zone_from_ptr(const void* ptr);
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extern void malloc_zone_free(malloc_zone_t* zone, void* ptr);
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extern void* malloc_zone_realloc(malloc_zone_t* zone, void* ptr, size_t size);
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/*
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* The following is a OSX zone allocator implementation.
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* /!\ WARNING. It assumes the underlying malloc implementation's
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* malloc_usable_size returns 0 when the given pointer is not owned by
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* the allocator. Sadly, OSX does call zone_size with pointers not
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* owned by the allocator.
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*/
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static size_t
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zone_size(malloc_zone_t *zone, const void *ptr)
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{
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return malloc_usable_size_impl(ptr);
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}
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static void *
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zone_malloc(malloc_zone_t *zone, size_t size)
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{
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return malloc_impl(size);
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}
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static void *
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zone_calloc(malloc_zone_t *zone, size_t num, size_t size)
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{
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return calloc_impl(num, size);
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}
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static void *
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zone_realloc(malloc_zone_t *zone, void *ptr, size_t size)
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{
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if (malloc_usable_size_impl(ptr))
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return realloc_impl(ptr, size);
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// Sometimes, system libraries call malloc_zone_* functions with the wrong
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// zone (e.g. CoreFoundation does). In that case, we need to find the real
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// one. We can't call libSystem's realloc directly because we're exporting
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// realloc from libmozglue and we'd pick that one, so we manually find the
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// right zone and realloc with it.
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malloc_zone_t* real_zone = malloc_zone_from_ptr(ptr);
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// The system allocator crashes voluntarily by default when a pointer can't
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// be traced back to a zone. Do the same.
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MOZ_RELEASE_ASSERT(real_zone);
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MOZ_RELEASE_ASSERT(real_zone != zone);
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return malloc_zone_realloc(real_zone, ptr, size);
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}
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static void
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other_zone_free(malloc_zone_t* original_zone, void* ptr)
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{
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// Sometimes, system libraries call malloc_zone_* functions with the wrong
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// zone (e.g. CoreFoundation does). In that case, we need to find the real
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// one. We can't call libSystem's free directly because we're exporting
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// free from libmozglue and we'd pick that one, so we manually find the
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// right zone and free with it.
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if (!ptr) {
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return;
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}
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malloc_zone_t* zone = malloc_zone_from_ptr(ptr);
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// The system allocator crashes voluntarily by default when a pointer can't
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// be traced back to a zone. Do the same.
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MOZ_RELEASE_ASSERT(zone);
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MOZ_RELEASE_ASSERT(zone != original_zone);
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return malloc_zone_free(zone, ptr);
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}
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static void
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zone_free(malloc_zone_t *zone, void *ptr)
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{
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if (malloc_usable_size_impl(ptr)) {
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free_impl(ptr);
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return;
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}
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other_zone_free(zone, ptr);
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}
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static void
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zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size)
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{
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size_t current_size = malloc_usable_size_impl(ptr);
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if (current_size) {
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MOZ_ASSERT(current_size == size);
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free_impl(ptr);
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return;
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}
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other_zone_free(zone, ptr);
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}
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static void *
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zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size)
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{
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void *ptr;
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if (posix_memalign_impl(&ptr, alignment, size) == 0)
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return ptr;
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return NULL;
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}
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static void *
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zone_valloc(malloc_zone_t *zone, size_t size)
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{
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return valloc_impl(size);
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}
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static void
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zone_destroy(malloc_zone_t *zone)
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{
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/* This function should never be called. */
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MOZ_CRASH();
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}
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static unsigned
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zone_batch_malloc(malloc_zone_t *zone, size_t size, void **results,
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unsigned num_requested)
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{
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unsigned i;
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for (i = 0; i < num_requested; i++) {
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results[i] = malloc_impl(size);
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if (!results[i])
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break;
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}
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return i;
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}
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static void
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zone_batch_free(malloc_zone_t *zone, void **to_be_freed,
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unsigned num_to_be_freed)
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{
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unsigned i;
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for (i = 0; i < num_to_be_freed; i++) {
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zone_free(zone, to_be_freed[i]);
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to_be_freed[i] = NULL;
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}
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}
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static size_t
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zone_pressure_relief(malloc_zone_t *zone, size_t goal)
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{
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return 0;
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}
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static size_t
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zone_good_size(malloc_zone_t *zone, size_t size)
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{
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return malloc_good_size_impl(size);
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}
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static kern_return_t
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zone_enumerator(task_t task, void *data, unsigned type_mask,
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vm_address_t zone_address, memory_reader_t reader,
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vm_range_recorder_t recorder)
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{
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return KERN_SUCCESS;
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}
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static boolean_t
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zone_check(malloc_zone_t *zone)
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{
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return true;
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}
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static void
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zone_print(malloc_zone_t *zone, boolean_t verbose)
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{
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}
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static void
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zone_log(malloc_zone_t *zone, void *address)
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{
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}
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extern void _malloc_prefork(void);
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extern void _malloc_postfork_child(void);
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static void
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zone_force_lock(malloc_zone_t *zone)
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{
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/* /!\ This calls into mozjemalloc. It works because we're linked in the
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* same library. */
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_malloc_prefork();
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}
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static void
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zone_force_unlock(malloc_zone_t *zone)
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{
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/* /!\ This calls into mozjemalloc. It works because we're linked in the
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* same library. */
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_malloc_postfork_child();
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}
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static void
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zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats)
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{
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/* We make no effort to actually fill the values */
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stats->blocks_in_use = 0;
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stats->size_in_use = 0;
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stats->max_size_in_use = 0;
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stats->size_allocated = 0;
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}
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static boolean_t
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zone_locked(malloc_zone_t *zone)
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{
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/* Pretend no lock is being held */
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return false;
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}
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static void
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zone_reinit_lock(malloc_zone_t *zone)
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{
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/* As of OSX 10.12, this function is only used when force_unlock would
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* be used if the zone version were < 9. So just use force_unlock. */
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zone_force_unlock(zone);
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}
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static malloc_zone_t zone;
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static struct malloc_introspection_t zone_introspect;
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static malloc_zone_t *get_default_zone()
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{
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malloc_zone_t **zones = NULL;
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unsigned int num_zones = 0;
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/*
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* On OSX 10.12, malloc_default_zone returns a special zone that is not
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* present in the list of registered zones. That zone uses a "lite zone"
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* if one is present (apparently enabled when malloc stack logging is
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* enabled), or the first registered zone otherwise. In practice this
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* means unless malloc stack logging is enabled, the first registered
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* zone is the default.
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* So get the list of zones to get the first one, instead of relying on
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* malloc_default_zone.
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*/
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if (KERN_SUCCESS != malloc_get_all_zones(0, NULL, (vm_address_t**) &zones,
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&num_zones)) {
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/* Reset the value in case the failure happened after it was set. */
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num_zones = 0;
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}
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if (num_zones) {
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return zones[0];
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}
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return malloc_default_zone();
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}
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__attribute__((constructor))
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static void
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register_zone(void)
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{
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malloc_zone_t *default_zone = get_default_zone();
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zone.size = zone_size;
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zone.malloc = zone_malloc;
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zone.calloc = zone_calloc;
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zone.valloc = zone_valloc;
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zone.free = zone_free;
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zone.realloc = zone_realloc;
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zone.destroy = zone_destroy;
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#ifdef MOZ_REPLACE_MALLOC
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zone.zone_name = "replace_malloc_zone";
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#else
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zone.zone_name = "jemalloc_zone";
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#endif
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zone.batch_malloc = zone_batch_malloc;
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zone.batch_free = zone_batch_free;
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zone.introspect = &zone_introspect;
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zone.version = 9;
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zone.memalign = zone_memalign;
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zone.free_definite_size = zone_free_definite_size;
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zone.pressure_relief = zone_pressure_relief;
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zone_introspect.enumerator = zone_enumerator;
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zone_introspect.good_size = zone_good_size;
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zone_introspect.check = zone_check;
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zone_introspect.print = zone_print;
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zone_introspect.log = zone_log;
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zone_introspect.force_lock = zone_force_lock;
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zone_introspect.force_unlock = zone_force_unlock;
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zone_introspect.statistics = zone_statistics;
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zone_introspect.zone_locked = zone_locked;
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zone_introspect.enable_discharge_checking = NULL;
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zone_introspect.disable_discharge_checking = NULL;
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zone_introspect.discharge = NULL;
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#ifdef __BLOCKS__
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zone_introspect.enumerate_discharged_pointers = NULL;
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#else
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zone_introspect.enumerate_unavailable_without_blocks = NULL;
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#endif
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zone_introspect.reinit_lock = zone_reinit_lock;
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/*
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* The default purgeable zone is created lazily by OSX's libc. It uses
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* the default zone when it is created for "small" allocations
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* (< 15 KiB), but assumes the default zone is a scalable_zone. This
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* obviously fails when the default zone is the jemalloc zone, so
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* malloc_default_purgeable_zone is called beforehand so that the
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* default purgeable zone is created when the default zone is still
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* a scalable_zone.
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*/
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malloc_zone_t *purgeable_zone = malloc_default_purgeable_zone();
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/* Register the custom zone. At this point it won't be the default. */
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malloc_zone_register(&zone);
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do {
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/*
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* Unregister and reregister the default zone. On OSX >= 10.6,
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* unregistering takes the last registered zone and places it at the
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* location of the specified zone. Unregistering the default zone thus
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* makes the last registered one the default. On OSX < 10.6,
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* unregistering shifts all registered zones. The first registered zone
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* then becomes the default.
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*/
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malloc_zone_unregister(default_zone);
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malloc_zone_register(default_zone);
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/*
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* On OSX 10.6, having the default purgeable zone appear before the default
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* zone makes some things crash because it thinks it owns the default
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* zone allocated pointers. We thus unregister/re-register it in order to
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* ensure it's always after the default zone. On OSX < 10.6, as
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* unregistering shifts registered zones, this simply removes the purgeable
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* zone from the list and adds it back at the end, after the default zone.
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* On OSX >= 10.6, unregistering replaces the purgeable zone with the last
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* registered zone above, i.e the default zone. Registering it again then
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* puts it at the end, obviously after the default zone.
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*/
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malloc_zone_unregister(purgeable_zone);
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malloc_zone_register(purgeable_zone);
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default_zone = get_default_zone();
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} while (default_zone != &zone);
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}
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