Function do_realloc_nonnull_zero

BeefRT/JEMalloc/src/jemalloc.c:3581–3618

}

static void *
do_realloc_nonnull_zero(void *ptr) {
	if (config_stats) {
		atomic_fetch_add_zu(&zero_realloc_count, 1, ATOMIC_RELAXED);
	}
	if (opt_zero_realloc_action == zero_realloc_action_alloc) {
		/*
		 * The user might have gotten an alloc setting while expecting a
		 * free setting.  If that's the case, we at least try to
		 * reduce the harm, and turn off the tcache while allocating, so
		 * that we'll get a true first fit.
		 */
		return do_rallocx(ptr, 1, MALLOCX_TCACHE_NONE, true);
	} else if (opt_zero_realloc_action == zero_realloc_action_free) {
		UTRACE(ptr, 0, 0);
		tsd_t *tsd = tsd_fetch();
		check_entry_exit_locking(tsd_tsdn(tsd));

		tcache_t *tcache = tcache_get_from_ind(tsd,
		    TCACHE_IND_AUTOMATIC, /* slow */ true,
		    /* is_alloc */ false);
		uintptr_t args[3] = {(uintptr_t)ptr, 0};
		hook_invoke_dalloc(hook_dalloc_realloc, ptr, args);
		ifree(tsd, ptr, tcache, true);

		check_entry_exit_locking(tsd_tsdn(tsd));
		return NULL;
	} else {
		safety_check_fail("Called realloc(non-null-ptr, 0) with "
		    "zero_realloc:abort set\n");
		/* In real code, this will never run; the safety check failure
		 * will call abort.  In the unit test, we just want to bail out
		 * without corrupting internal state that the test needs to
		 * finish.
		 */
		return NULL;
	}
}

JEMALLOC_EXPORT JEMALLOC_ALLOCATOR JEMALLOC_RESTRICT_RETURN
void JEMALLOC_NOTHROW *