133     __swap(&new_node, &idp->top);  in __idr_grow()
135     idp->top->ary[0] = new_node;  in __idr_grow()
136     idp->top->layer = new_node ? (new_node->layer + 1) : 0; // 注意特判空指针  in __idr_grow()
137     idp->top->bitmap = 0;  in __idr_grow()
138     idp->top->full = 0; // clear  in __idr_grow()
142         idp->top->bitmap = 1;  in __idr_grow()
146         idp->top->full = 1; // 别忘了初始化 full  in __idr_grow()
162     while (NULL == idp->top || idp->top->full == IDR_FULL)  in __idr_get_empty_slot()
167     int layer = idp->top->layer;  in __idr_get_empty_slot()
171     struct idr_layer *cur_layer = idp->top;  in __idr_get_empty_slot()
216     if (unlikely(NULL == stk[0] || NULL == idp->top))  in __idr_mark_full()
251     if (unlikely(idp->top == NULL || __id < 0))  in __idr_get_path()
257     struct idr_layer *cur_layer = idp->top;  in __idr_get_path()
297     if (unlikely(NULL == stk[0] || NULL == idp->top))  in __idr_erase_full()
340     while (idp->top != NULL && ((idp->top->bitmap <= 1 && idp->top->layer > 0) || // 一条链的情况  in __idr_erase_full()
341                                 (idp->top->layer == 0 && idp->top->bitmap == 0))) // 最后一个点的情况  in __idr_erase_full()
343         struct idr_layer *t = idp->top->layer ? idp->top->ary[0] : NULL;  in __idr_erase_full()
344         __idr_layer_free(idp->top);  in __idr_erase_full()
345         idp->top = t;  in __idr_erase_full()
403     if (unlikely(idp->top == NULL || __id < 0))  in idr_remove()
425     if (unlikely(NULL == idp->top))  in __idr_remove_all_with_free()
434     struct idr_layer *cur_layer = idp->top;  in __idr_remove_all_with_free()
468     idp->top = NULL;  in __idr_remove_all_with_free()
477     if (likely(idp->top))  in __idr_destroy_with_free()
479     idp->top = NULL;  in __idr_destroy_with_free()
492     if (unlikely(NULL == idp->top))  in idr_remove_all()
506     idp->top = NULL;  in idr_destroy()
522     if (unlikely(idp->top == NULL || __id < 0))  in idr_find()
528     struct idr_layer *cur_layer = idp->top;  in idr_find()
561     if (unlikely(idp->top == NULL))  in idr_find_next_getid()
580     struct idr_layer *cur_layer = idp->top;  in idr_find_next_getid()
681     if (unlikely(idp->top == NULL || __id < 0))  in idr_replace_get_old()
684     struct idr_layer *cur_layer = idp->top;  in idr_replace_get_old()
737     if (idp == NULL || idp->top == NULL || !idp->top->bitmap)  in idr_empty()
792     if (unlikely(idp == NULL || idp->top == NULL || __id < 0))  in idr_count()
796     struct idr_layer *cur_layer = idp->top;  in idr_count()
969     if (unlikely(NULL == ida_p || NULL == ida_p->idr.top || id < 0))  in ida_count()
992     if (unlikely(NULL == ida_p || NULL == ida_p->idr.top || id < 0))  in ida_remove()
1036     ida_p->idr.top = NULL;  in ida_destroy()
1050     if (ida_p == NULL || ida_p->idr.top == NULL || !ida_p->idr.top->bitmap)  in ida_empty()