[cfe-dev] Creating 'clang-mutate' for clang-tools-extra

David Blaikie via cfe-dev cfe-dev at lists.llvm.org
Tue Aug 9 08:47:59 PDT 2016

Haven't heard of anyone working on it (& don't have time myself) - but I've
been looking forward to/wanting to see such a tool in LLVM/Clang for a
while now. (if you could have it running on a buildbot or similar that
tracked LLVM changes so we could vet code change test coverage... that'd be
so awesome)

I'd always pictured such a tool as more like a sanitizer/run at the LLVM IR
level rather than as source transformations - but I've not thought about it
too much & maybe it makes more sense as a real source transformation
(easier to communicate to the user "this change is not caught by test

(idle thought: Presumably it'd be easier to just add a ! at the top of the
boolean expression, so transforming "if (date > expiry)" into "if (!(date >

On Tue, Aug 9, 2016 at 3:02 AM Jonathan Coe via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> I'd like a tool that applies plausible edits to code so I can check if
> tests pick up the change or not.
> I think I can do this with a clang-tidy-like framework with a list of
> mutations (rather than checks).
> The tool would produce a large list of single-change 'fixes' for
> clang-apply-fixes to make use of and to be set up as a series of mutated
> branches for a CI system. Applying mutations to only new code should keep
> the set manageable.
> An example mutation would invert `<` in conditionals:
> `if(date > expiry ) { return 0.0; }`
> is mutated to
> `if(date < expiry ) { return 0.0; }`
> If our tests don't spot this, we have a gap.
> Is anyone working on, or interested in collaborating on a similar tool?
> regards,
> Jon
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20160809/42f9186e/attachment.html>

More information about the cfe-dev mailing list