448 lines
14 KiB
C
448 lines
14 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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/* 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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/*
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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 *default_zone, *purgeable_zone;
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static malloc_zone_t jemalloc_zone;
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static struct malloc_introspection_t jemalloc_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, const 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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static void *zone_memalign(malloc_zone_t *zone, size_t alignment,
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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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static void zone_destroy(malloc_zone_t *zone);
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static unsigned zone_batch_malloc(struct _malloc_zone_t *zone, size_t size,
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void **results, unsigned num_requested);
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static void zone_batch_free(struct _malloc_zone_t *zone,
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void **to_be_freed, unsigned num_to_be_freed);
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static size_t zone_pressure_relief(struct _malloc_zone_t *zone, size_t goal);
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static size_t zone_good_size(malloc_zone_t *zone, size_t size);
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static kern_return_t 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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static boolean_t zone_check(malloc_zone_t *zone);
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static void zone_print(malloc_zone_t *zone, boolean_t verbose);
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static void zone_log(malloc_zone_t *zone, void *address);
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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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static void zone_statistics(malloc_zone_t *zone,
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malloc_statistics_t *stats);
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static boolean_t zone_locked(malloc_zone_t *zone);
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static void zone_reinit_lock(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, const void *ptr) {
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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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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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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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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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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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if (ivsalloc(tsdn_fetch(), ptr) != 0) {
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return je_realloc(ptr, size);
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}
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return realloc(ptr, size);
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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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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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static void
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zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size) {
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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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static void
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zone_destroy(malloc_zone_t *zone) {
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/* This function should never be called. */
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not_reached();
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}
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static unsigned
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zone_batch_malloc(struct _malloc_zone_t *zone, size_t size, void **results,
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unsigned num_requested) {
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unsigned i;
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for (i = 0; i < num_requested; i++) {
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results[i] = je_malloc(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(struct _malloc_zone_t *zone, void **to_be_freed,
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unsigned num_to_be_freed) {
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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(struct _malloc_zone_t *zone, size_t goal) {
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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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if (size == 0) {
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size = 1;
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}
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return s2u(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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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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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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static void
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zone_log(malloc_zone_t *zone, void *address) {
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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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if (isthreaded) {
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jemalloc_prefork();
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}
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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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* Call jemalloc_postfork_child() rather than
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* jemalloc_postfork_parent(), because this function is executed by both
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* parent and child. The parent can tolerate having state
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* reinitialized, but the child cannot unlock mutexes that were locked
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* by the parent.
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*/
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if (isthreaded) {
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jemalloc_postfork_child();
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}
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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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/* 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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/* 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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/* 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 void
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zone_init(void) {
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jemalloc_zone.size = zone_size;
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jemalloc_zone.malloc = zone_malloc;
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jemalloc_zone.calloc = zone_calloc;
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jemalloc_zone.valloc = zone_valloc;
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jemalloc_zone.free = zone_free;
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jemalloc_zone.realloc = zone_realloc;
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jemalloc_zone.destroy = zone_destroy;
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jemalloc_zone.zone_name = "jemalloc_zone";
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jemalloc_zone.batch_malloc = zone_batch_malloc;
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jemalloc_zone.batch_free = zone_batch_free;
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jemalloc_zone.introspect = &jemalloc_zone_introspect;
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jemalloc_zone.version = 9;
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jemalloc_zone.memalign = zone_memalign;
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jemalloc_zone.free_definite_size = zone_free_definite_size;
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jemalloc_zone.pressure_relief = zone_pressure_relief;
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jemalloc_zone_introspect.enumerator = zone_enumerator;
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jemalloc_zone_introspect.good_size = zone_good_size;
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jemalloc_zone_introspect.check = zone_check;
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jemalloc_zone_introspect.print = zone_print;
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jemalloc_zone_introspect.log = zone_log;
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jemalloc_zone_introspect.force_lock = zone_force_lock;
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jemalloc_zone_introspect.force_unlock = zone_force_unlock;
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jemalloc_zone_introspect.statistics = zone_statistics;
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jemalloc_zone_introspect.zone_locked = zone_locked;
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jemalloc_zone_introspect.enable_discharge_checking = NULL;
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jemalloc_zone_introspect.disable_discharge_checking = NULL;
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jemalloc_zone_introspect.discharge = NULL;
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#ifdef __BLOCKS__
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jemalloc_zone_introspect.enumerate_discharged_pointers = NULL;
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#else
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jemalloc_zone_introspect.enumerate_unavailable_without_blocks = NULL;
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#endif
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jemalloc_zone_introspect.reinit_lock = zone_reinit_lock;
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}
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static malloc_zone_t *
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zone_default_get(void) {
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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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}
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return malloc_default_zone();
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}
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/* As written, this function can only promote jemalloc_zone. */
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static void
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zone_promote(void) {
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malloc_zone_t *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 != NULL) {
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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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zone = zone_default_get();
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} while (zone != &jemalloc_zone);
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}
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JEMALLOC_ATTR(constructor)
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void
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zone_register(void) {
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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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default_zone = zone_default_get();
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if (!default_zone->zone_name || strcmp(default_zone->zone_name,
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"DefaultMallocZone") != 0) {
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return;
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}
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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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purgeable_zone = (malloc_default_purgeable_zone == NULL) ? NULL :
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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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zone_init();
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malloc_zone_register(&jemalloc_zone);
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/* Promote the custom zone to be default. */
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zone_promote();
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}
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