c++ - What's the "discriminator" in addr2line?

Question

When running addr2line in some programs, I get a "discriminator N" comment at the end of the line:

main at /tmp/nsievebits.c:56 (discriminator 3)

The man page doesn't mention it, and a quick Google search seems to indicate mostly source code files, with no clear explanation. Is it some intentionally undocumented feature? More importantly, should I worry about it at all?

Answer 1

据我了解，当一行中有多个代码路径时，鉴别器会很有用，请参阅更多信息。您可以放心地忽略它们，但如果有人知道如何阅读它们，它们可以为您提供有关堆栈确切指向的位置的非常精确的信息。