objective-c - XCode 内存泄漏检测是如何工作的？

Question

XCode Instrument Leak 工具如何确定对象是泄漏还是只是尚未发布的对象？我是 Objective C 的新手，泄漏工具检测到我使用的代码中的泄漏。但是代码对我来说看起来很合理。所以只是想知道我能在多大程度上信任这个工具？

Answer 1

“泄漏”是一个仍在分配的对象，但您的应用程序不再具有引用指向那个对象。由于您不再有引用，因此您无法释放该对象，因此这是一个泄漏。

作为leaks(1) man page说:

leaks identifies leaked memory -- memory that the application has allocated, but has been lost and cannot be freed. Specifically, leaks examines a specified process's memory for values that may be pointers to malloc-allocated buffers. Any buffer reachable from a pointer in writable memory, a register, or on the stack is assumed to be memory in use. Any buffer reachable from a pointer in a reachable malloc-allocated buffer is also assumed to be in use. The buffers which are not reachable are leaks; the buffers could never be freed because no pointer exists in memory to the buffer, and thus free() could never be called for these buffers

您可能还想查看 Instruments 中的 ObjectAlloc 工具。