308 lines
8.4 KiB
C
308 lines
8.4 KiB
C
#include "jemalloc/internal/jemalloc_internal.h"
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#ifndef JEMALLOC_ZONE
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# error "This source file is for zones on Darwin (OS X)."
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#endif
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/*
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* The malloc_default_purgeable_zone function is only available on >= 10.6.
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* We need to check whether it is present at runtime, thus the weak_import.
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*/
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extern malloc_zone_t *malloc_default_purgeable_zone(void)
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JEMALLOC_ATTR(weak_import);
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/******************************************************************************/
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/* Data. */
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static malloc_zone_t zone;
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static struct malloc_introspection_t zone_introspect;
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/******************************************************************************/
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/* Function prototypes for non-inline static functions. */
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static size_t zone_size(malloc_zone_t *zone, void *ptr);
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static void *zone_malloc(malloc_zone_t *zone, size_t size);
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static void *zone_calloc(malloc_zone_t *zone, size_t num, size_t size);
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static void *zone_valloc(malloc_zone_t *zone, size_t size);
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static void zone_free(malloc_zone_t *zone, void *ptr);
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static void *zone_realloc(malloc_zone_t *zone, void *ptr, size_t size);
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#if (JEMALLOC_ZONE_VERSION >= 5)
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static void *zone_memalign(malloc_zone_t *zone, size_t alignment,
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#endif
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#if (JEMALLOC_ZONE_VERSION >= 6)
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size_t size);
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static void zone_free_definite_size(malloc_zone_t *zone, void *ptr,
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size_t size);
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#endif
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static void *zone_destroy(malloc_zone_t *zone);
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static size_t zone_good_size(malloc_zone_t *zone, size_t size);
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static void zone_force_lock(malloc_zone_t *zone);
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static void zone_force_unlock(malloc_zone_t *zone);
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/******************************************************************************/
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/*
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* Functions.
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*/
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static size_t
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zone_size(malloc_zone_t *zone, void *ptr)
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{
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/*
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* There appear to be places within Darwin (such as setenv(3)) that
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* cause calls to this function with pointers that *no* zone owns. If
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* we knew that all pointers were owned by *some* zone, we could split
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* our zone into two parts, and use one as the default allocator and
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* the other as the default deallocator/reallocator. Since that will
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* not work in practice, we must check all pointers to assure that they
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* reside within a mapped extent before determining size.
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*/
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return (ivsalloc(tsdn_fetch(), 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 (je_malloc(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 (je_calloc(num, size));
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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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void *ret = NULL; /* Assignment avoids useless compiler warning. */
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je_posix_memalign(&ret, PAGE, size);
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return (ret);
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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 (ivsalloc(tsdn_fetch(), ptr) != 0) {
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je_free(ptr);
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return;
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}
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free(ptr);
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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 (ivsalloc(tsdn_fetch(), ptr) != 0)
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return (je_realloc(ptr, size));
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return (realloc(ptr, size));
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}
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#if (JEMALLOC_ZONE_VERSION >= 5)
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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 *ret = NULL; /* Assignment avoids useless compiler warning. */
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je_posix_memalign(&ret, alignment, size);
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return (ret);
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}
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#endif
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#if (JEMALLOC_ZONE_VERSION >= 6)
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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 alloc_size;
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alloc_size = ivsalloc(tsdn_fetch(), ptr);
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if (alloc_size != 0) {
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assert(alloc_size == size);
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je_free(ptr);
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return;
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}
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free(ptr);
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}
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#endif
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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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not_reached();
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return (NULL);
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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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if (size == 0)
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size = 1;
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return (s2u(size));
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}
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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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if (isthreaded)
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jemalloc_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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if (isthreaded)
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jemalloc_postfork_parent();
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}
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static malloc_zone_t *
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get_default_zone(void)
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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. So get the list of zones to get the first one,
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* instead of relying on malloc_default_zone.
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*/
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if (KERN_SUCCESS != malloc_get_all_zones(0, NULL,
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(vm_address_t**)&zones, &num_zones)) {
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/*
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* Reset the value in case the failure happened after it was
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* set.
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*/
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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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return (malloc_default_zone());
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}
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JEMALLOC_ATTR(constructor)
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void
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register_zone(void)
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{
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/*
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* If something else replaced the system default zone allocator, don't
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* register jemalloc's.
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*/
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malloc_zone_t *default_zone = get_default_zone();
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malloc_zone_t *purgeable_zone = NULL;
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if (!default_zone->zone_name ||
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strcmp(default_zone->zone_name, "DefaultMallocZone") != 0) {
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return;
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}
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zone.size = (void *)zone_size;
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zone.malloc = (void *)zone_malloc;
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zone.calloc = (void *)zone_calloc;
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zone.valloc = (void *)zone_valloc;
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zone.free = (void *)zone_free;
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zone.realloc = (void *)zone_realloc;
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zone.destroy = (void *)zone_destroy;
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zone.zone_name = "jemalloc_zone";
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zone.batch_malloc = NULL;
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zone.batch_free = NULL;
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zone.introspect = &zone_introspect;
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zone.version = JEMALLOC_ZONE_VERSION;
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#if (JEMALLOC_ZONE_VERSION >= 5)
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zone.memalign = zone_memalign;
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#endif
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#if (JEMALLOC_ZONE_VERSION >= 6)
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zone.free_definite_size = zone_free_definite_size;
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#endif
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#if (JEMALLOC_ZONE_VERSION >= 8)
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zone.pressure_relief = NULL;
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#endif
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zone_introspect.enumerator = NULL;
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zone_introspect.good_size = (void *)zone_good_size;
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zone_introspect.check = NULL;
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zone_introspect.print = NULL;
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zone_introspect.log = NULL;
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zone_introspect.force_lock = (void *)zone_force_lock;
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zone_introspect.force_unlock = (void *)zone_force_unlock;
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zone_introspect.statistics = NULL;
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#if (JEMALLOC_ZONE_VERSION >= 6)
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zone_introspect.zone_locked = NULL;
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#endif
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#if (JEMALLOC_ZONE_VERSION >= 7)
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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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#endif
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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. As purgeable zones only exist on >= 10.6, we need
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* to check for the existence of malloc_default_purgeable_zone() at
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* run time.
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*/
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if (malloc_default_purgeable_zone != NULL)
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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
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* at the location of the specified zone. Unregistering the
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* default zone thus makes the last registered one the default.
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* On OSX < 10.6, unregistering shifts all registered zones.
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* The first registered zone 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
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* the default zone makes some things crash because it thinks it
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* owns the default zone allocated pointers. We thus
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* unregister/re-register it in order to ensure it's always
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* after the default zone. On OSX < 10.6, there is no purgeable
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* zone, so this does nothing. On OSX >= 10.6, unregistering
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* replaces the purgeable zone with the last registered zone
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* above, i.e. the default zone. Registering it again then puts
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* it at the end, obviously after the default zone.
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*/
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if (purgeable_zone) {
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malloc_zone_unregister(purgeable_zone);
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malloc_zone_register(purgeable_zone);
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}
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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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