[llvm-dev] option similar to -finstrument-functions but for code blocks

David Greene via llvm-dev llvm-dev at lists.llvm.org
Thu Jan 24 08:19:43 PST 2019

Peng Yu via llvm-dev <llvm-dev at lists.llvm.org> writes:

> I'd like to track not just at the function level, but also at the code
> block level. For example, for a if-else statement, I want to know when
> the if-branch or else-branch is enter/exit.
> Is there a clang option similar to -finstrument-functions for code blocks?

Are you looking for code coverage or profile information (block
execution counts)?  Dean already replied with the code coverage
information.  LLVM has a profile instrumentation pass which is run with
opt -profile-generate.  This is gprof-style profiling.  I don't know
offhand which (if any) clang option is hooked up to -profile-generate.


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