Why gollvm not support race detector?

[Yuan Ting]

Hi,

I know from README that gollvm does not support race detector. Is there any technical problem? Is it possible to use ThreadSanitizer in LLVM to implement a workaround race detector in gollvm?

Thanks.

Ting

[Ian Lance Taylor]

On Thu, Aug 6, 2020 at 11:33 PM Yuan Ting <yuan...@ict.ac.cn> wrote:
>
> I know from README that gollvm does not support race detector. Is there any technical problem? Is it possible to use ThreadSanitizer in LLVM to implement a workaround race detector in gollvm?

ThreadSanitizer knows a great deal about the behavior of C library
functions. In order to use it with GoLLVM, it would be necessary to
teach it about the behavior of Go library functions. This is not
impossible--the same work was done for the Go race detector--but
somebody would have to do the work.

Ian

[Ting Yuan]

Thanks for your reply,

If I'm not confused, the implementation of Go race detector is written in go/src/runtime/race.go and its TSAN implementation (in C/C++) is dynamic linked to target programs by a shared library. Could I simply add race.go to gofrontend then link the target programs by the TSAN shared library to make the race detector enabled? I know integrating the race detector to gccgo/gollvm can't be done as easily as the aforementioned method, but what problems will I encounter when I do this.

Thanks, Ting

[Than McIntosh]

>>Could I simply add race.go to gofrontend then link the target programs by the TSAN shared library to make the race detector enabled?

The race detector implementation also includes a compiler component (look for flag_race in the cmd/compile source code), so that would have to be ported to gccgo as well, since gccgo uses an entirely different compiler implementation. There are probably other things as well that would have to be pulled in.

Than

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