| #include "jemalloc/internal/jemalloc_internal.h" |
| #ifndef JEMALLOC_ZONE |
| # error "This source file is for zones on Darwin (OS X)." |
| #endif |
| |
| /* |
| * The malloc_default_purgeable_zone() function is only available on >= 10.6. |
| * We need to check whether it is present at runtime, thus the weak_import. |
| */ |
| extern malloc_zone_t *malloc_default_purgeable_zone(void) |
| JEMALLOC_ATTR(weak_import); |
| |
| /******************************************************************************/ |
| /* Data. */ |
| |
| static malloc_zone_t *default_zone, *purgeable_zone; |
| static malloc_zone_t jemalloc_zone; |
| static struct malloc_introspection_t jemalloc_zone_introspect; |
| |
| /******************************************************************************/ |
| /* Function prototypes for non-inline static functions. */ |
| |
| static size_t zone_size(malloc_zone_t *zone, void *ptr); |
| static void *zone_malloc(malloc_zone_t *zone, size_t size); |
| static void *zone_calloc(malloc_zone_t *zone, size_t num, size_t size); |
| static void *zone_valloc(malloc_zone_t *zone, size_t size); |
| static void zone_free(malloc_zone_t *zone, void *ptr); |
| static void *zone_realloc(malloc_zone_t *zone, void *ptr, size_t size); |
| #if (JEMALLOC_ZONE_VERSION >= 5) |
| static void *zone_memalign(malloc_zone_t *zone, size_t alignment, |
| #endif |
| #if (JEMALLOC_ZONE_VERSION >= 6) |
| size_t size); |
| static void zone_free_definite_size(malloc_zone_t *zone, void *ptr, |
| size_t size); |
| #endif |
| static void *zone_destroy(malloc_zone_t *zone); |
| static size_t zone_good_size(malloc_zone_t *zone, size_t size); |
| static void zone_force_lock(malloc_zone_t *zone); |
| static void zone_force_unlock(malloc_zone_t *zone); |
| |
| /******************************************************************************/ |
| /* |
| * Functions. |
| */ |
| |
| static size_t |
| zone_size(malloc_zone_t *zone, void *ptr) |
| { |
| |
| /* |
| * There appear to be places within Darwin (such as setenv(3)) that |
| * cause calls to this function with pointers that *no* zone owns. If |
| * we knew that all pointers were owned by *some* zone, we could split |
| * our zone into two parts, and use one as the default allocator and |
| * the other as the default deallocator/reallocator. Since that will |
| * not work in practice, we must check all pointers to assure that they |
| * reside within a mapped chunk before determining size. |
| */ |
| return (ivsalloc(tsdn_fetch(), ptr, config_prof)); |
| } |
| |
| static void * |
| zone_malloc(malloc_zone_t *zone, size_t size) |
| { |
| |
| return (je_malloc(size)); |
| } |
| |
| static void * |
| zone_calloc(malloc_zone_t *zone, size_t num, size_t size) |
| { |
| |
| return (je_calloc(num, size)); |
| } |
| |
| static void * |
| zone_valloc(malloc_zone_t *zone, size_t size) |
| { |
| void *ret = NULL; /* Assignment avoids useless compiler warning. */ |
| |
| je_posix_memalign(&ret, PAGE, size); |
| |
| return (ret); |
| } |
| |
| static void |
| zone_free(malloc_zone_t *zone, void *ptr) |
| { |
| |
| if (ivsalloc(tsdn_fetch(), ptr, config_prof) != 0) { |
| je_free(ptr); |
| return; |
| } |
| |
| free(ptr); |
| } |
| |
| static void * |
| zone_realloc(malloc_zone_t *zone, void *ptr, size_t size) |
| { |
| |
| if (ivsalloc(tsdn_fetch(), ptr, config_prof) != 0) |
| return (je_realloc(ptr, size)); |
| |
| return (realloc(ptr, size)); |
| } |
| |
| #if (JEMALLOC_ZONE_VERSION >= 5) |
| static void * |
| zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size) |
| { |
| void *ret = NULL; /* Assignment avoids useless compiler warning. */ |
| |
| je_posix_memalign(&ret, alignment, size); |
| |
| return (ret); |
| } |
| #endif |
| |
| #if (JEMALLOC_ZONE_VERSION >= 6) |
| static void |
| zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size) |
| { |
| size_t alloc_size; |
| |
| alloc_size = ivsalloc(tsdn_fetch(), ptr, config_prof); |
| if (alloc_size != 0) { |
| assert(alloc_size == size); |
| je_free(ptr); |
| return; |
| } |
| |
| free(ptr); |
| } |
| #endif |
| |
| static void * |
| zone_destroy(malloc_zone_t *zone) |
| { |
| |
| /* This function should never be called. */ |
| not_reached(); |
| return (NULL); |
| } |
| |
| static size_t |
| zone_good_size(malloc_zone_t *zone, size_t size) |
| { |
| |
| if (size == 0) |
| size = 1; |
| return (s2u(size)); |
| } |
| |
| static void |
| zone_force_lock(malloc_zone_t *zone) |
| { |
| |
| if (isthreaded) |
| jemalloc_prefork(); |
| } |
| |
| static void |
| zone_force_unlock(malloc_zone_t *zone) |
| { |
| |
| /* |
| * Call jemalloc_postfork_child() rather than |
| * jemalloc_postfork_parent(), because this function is executed by both |
| * parent and child. The parent can tolerate having state |
| * reinitialized, but the child cannot unlock mutexes that were locked |
| * by the parent. |
| */ |
| if (isthreaded) |
| jemalloc_postfork_child(); |
| } |
| |
| static void |
| zone_init(void) |
| { |
| |
| jemalloc_zone.size = (void *)zone_size; |
| jemalloc_zone.malloc = (void *)zone_malloc; |
| jemalloc_zone.calloc = (void *)zone_calloc; |
| jemalloc_zone.valloc = (void *)zone_valloc; |
| jemalloc_zone.free = (void *)zone_free; |
| jemalloc_zone.realloc = (void *)zone_realloc; |
| jemalloc_zone.destroy = (void *)zone_destroy; |
| jemalloc_zone.zone_name = "jemalloc_zone"; |
| jemalloc_zone.batch_malloc = NULL; |
| jemalloc_zone.batch_free = NULL; |
| jemalloc_zone.introspect = &jemalloc_zone_introspect; |
| jemalloc_zone.version = JEMALLOC_ZONE_VERSION; |
| #if (JEMALLOC_ZONE_VERSION >= 5) |
| jemalloc_zone.memalign = zone_memalign; |
| #endif |
| #if (JEMALLOC_ZONE_VERSION >= 6) |
| jemalloc_zone.free_definite_size = zone_free_definite_size; |
| #endif |
| #if (JEMALLOC_ZONE_VERSION >= 8) |
| jemalloc_zone.pressure_relief = NULL; |
| #endif |
| |
| jemalloc_zone_introspect.enumerator = NULL; |
| jemalloc_zone_introspect.good_size = (void *)zone_good_size; |
| jemalloc_zone_introspect.check = NULL; |
| jemalloc_zone_introspect.print = NULL; |
| jemalloc_zone_introspect.log = NULL; |
| jemalloc_zone_introspect.force_lock = (void *)zone_force_lock; |
| jemalloc_zone_introspect.force_unlock = (void *)zone_force_unlock; |
| jemalloc_zone_introspect.statistics = NULL; |
| #if (JEMALLOC_ZONE_VERSION >= 6) |
| jemalloc_zone_introspect.zone_locked = NULL; |
| #endif |
| #if (JEMALLOC_ZONE_VERSION >= 7) |
| jemalloc_zone_introspect.enable_discharge_checking = NULL; |
| jemalloc_zone_introspect.disable_discharge_checking = NULL; |
| jemalloc_zone_introspect.discharge = NULL; |
| # ifdef __BLOCKS__ |
| jemalloc_zone_introspect.enumerate_discharged_pointers = NULL; |
| # else |
| jemalloc_zone_introspect.enumerate_unavailable_without_blocks = NULL; |
| # endif |
| #endif |
| } |
| |
| static malloc_zone_t * |
| zone_default_get(void) |
| { |
| malloc_zone_t **zones = NULL; |
| unsigned int num_zones = 0; |
| |
| /* |
| * On OSX 10.12, malloc_default_zone returns a special zone that is not |
| * present in the list of registered zones. That zone uses a "lite zone" |
| * if one is present (apparently enabled when malloc stack logging is |
| * enabled), or the first registered zone otherwise. In practice this |
| * means unless malloc stack logging is enabled, the first registered |
| * zone is the default. So get the list of zones to get the first one, |
| * instead of relying on malloc_default_zone. |
| */ |
| if (KERN_SUCCESS != malloc_get_all_zones(0, NULL, |
| (vm_address_t**)&zones, &num_zones)) { |
| /* |
| * Reset the value in case the failure happened after it was |
| * set. |
| */ |
| num_zones = 0; |
| } |
| |
| if (num_zones) |
| return (zones[0]); |
| |
| return (malloc_default_zone()); |
| } |
| |
| /* As written, this function can only promote jemalloc_zone. */ |
| static void |
| zone_promote(void) |
| { |
| malloc_zone_t *zone; |
| |
| do { |
| /* |
| * Unregister and reregister the default zone. On OSX >= 10.6, |
| * unregistering takes the last registered zone and places it |
| * at the location of the specified zone. Unregistering the |
| * default zone thus makes the last registered one the default. |
| * On OSX < 10.6, unregistering shifts all registered zones. |
| * The first registered zone then becomes the default. |
| */ |
| malloc_zone_unregister(default_zone); |
| malloc_zone_register(default_zone); |
| |
| /* |
| * On OSX 10.6, having the default purgeable zone appear before |
| * the default zone makes some things crash because it thinks it |
| * owns the default zone allocated pointers. We thus |
| * unregister/re-register it in order to ensure it's always |
| * after the default zone. On OSX < 10.6, there is no purgeable |
| * zone, so this does nothing. On OSX >= 10.6, unregistering |
| * replaces the purgeable zone with the last registered zone |
| * above, i.e. the default zone. Registering it again then puts |
| * it at the end, obviously after the default zone. |
| */ |
| if (purgeable_zone != NULL) { |
| malloc_zone_unregister(purgeable_zone); |
| malloc_zone_register(purgeable_zone); |
| } |
| |
| zone = zone_default_get(); |
| } while (zone != &jemalloc_zone); |
| } |
| |
| JEMALLOC_ATTR(constructor) |
| void |
| zone_register(void) |
| { |
| |
| /* |
| * If something else replaced the system default zone allocator, don't |
| * register jemalloc's. |
| */ |
| default_zone = zone_default_get(); |
| if (!default_zone->zone_name || strcmp(default_zone->zone_name, |
| "DefaultMallocZone") != 0) |
| return; |
| |
| /* |
| * The default purgeable zone is created lazily by OSX's libc. It uses |
| * the default zone when it is created for "small" allocations |
| * (< 15 KiB), but assumes the default zone is a scalable_zone. This |
| * obviously fails when the default zone is the jemalloc zone, so |
| * malloc_default_purgeable_zone() is called beforehand so that the |
| * default purgeable zone is created when the default zone is still |
| * a scalable_zone. As purgeable zones only exist on >= 10.6, we need |
| * to check for the existence of malloc_default_purgeable_zone() at |
| * run time. |
| */ |
| purgeable_zone = (malloc_default_purgeable_zone == NULL) ? NULL : |
| malloc_default_purgeable_zone(); |
| |
| /* Register the custom zone. At this point it won't be the default. */ |
| zone_init(); |
| malloc_zone_register(&jemalloc_zone); |
| |
| /* Promote the custom zone to be default. */ |
| zone_promote(); |
| } |