libgc是一个保守的内存垃圾清理器，它会周期性的扫描程序中的数据，并标记所有的当前在heap对象中正在被使用的内存，随后释放所有未被标记的的内存。

但是，libgc不会检测使用libgc以外的allocator分配的内存空间，也不会对其进行自动的释放。-Libgc is a conservative garbage cleaning device, it will scan the program in the periodic data, and mark the current memory in the heap object is used by all, then release all the unlabeled memory.

However, libgc does not detect memory space allocated by libgc other than allocator and will not automatically release it.