Function large_ralloc

BeefRT/JEMalloc/src/large.c:183–225

}

void *
large_ralloc(tsdn_t *tsdn, arena_t *arena, void *ptr, size_t usize,
    size_t alignment, bool zero, tcache_t *tcache,
    hook_ralloc_args_t *hook_args) {
	edata_t *edata = emap_edata_lookup(tsdn, &arena_emap_global, ptr);

	size_t oldusize = edata_usize_get(edata);
	/* The following should have been caught by callers. */
	assert(usize > 0 && usize <= SC_LARGE_MAXCLASS);
	/* Both allocation sizes must be large to avoid a move. */
	assert(oldusize >= SC_LARGE_MINCLASS
	    && usize >= SC_LARGE_MINCLASS);

	/* Try to avoid moving the allocation. */
	if (!large_ralloc_no_move(tsdn, edata, usize, usize, zero)) {
		hook_invoke_expand(hook_args->is_realloc
		    ? hook_expand_realloc : hook_expand_rallocx, ptr, oldusize,
		    usize, (uintptr_t)ptr, hook_args->args);
		return edata_addr_get(edata);
	}

	/*
	 * usize and old size are different enough that we need to use a
	 * different size class.  In that case, fall back to allocating new
	 * space and copying.
	 */
	void *ret = large_ralloc_move_helper(tsdn, arena, usize, alignment,
	    zero);
	if (ret == NULL) {
		return NULL;
	}

	hook_invoke_alloc(hook_args->is_realloc
	    ? hook_alloc_realloc : hook_alloc_rallocx, ret, (uintptr_t)ret,
	    hook_args->args);
	hook_invoke_dalloc(hook_args->is_realloc
	    ? hook_dalloc_realloc : hook_dalloc_rallocx, ptr, hook_args->args);

	size_t copysize = (usize < oldusize) ? usize : oldusize;
	memcpy(ret, edata_addr_get(edata), copysize);
	isdalloct(tsdn, edata_addr_get(edata), oldusize, tcache, NULL, true);
	return ret;
}

/*
 * locked indicates whether the arena's large_mtx is currently held.