[compiler-rt] r363326 - [libFuzzer] simplify the DFT trace collection using the new faster DFSan mode that traces up to 16 labels at a time and never runs out of labels.

[Hans Wennborg via llvm-commits]

On Fri, Jun 14, 2019 at 8:46 AM Martin Storsjö via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
>
> On Thu, 13 Jun 2019, Kostya Serebryany via llvm-commits wrote:
>
> > Author: kcc
> > Date: Thu Jun 13 14:17:49 2019
> > New Revision: 363326
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=363326&view=rev
> > Log:
> > [libFuzzer] simplify the DFT trace collection using the new faster DFSan mode that traces up to 16 labels at a time and never runs out of labels.
> >
> > Added:
> >    compiler-rt/trunk/test/fuzzer/Labels20Test.cpp
> > Modified:
> >    compiler-rt/trunk/lib/fuzzer/FuzzerDataFlowTrace.cpp
> >    compiler-rt/trunk/lib/fuzzer/FuzzerFork.cpp
> >    compiler-rt/trunk/lib/fuzzer/dataflow/DataFlow.cpp
> >    compiler-rt/trunk/test/fuzzer/OnlySomeBytesTest.cpp
> >    compiler-rt/trunk/test/fuzzer/dataflow.test
> >
> > Modified: compiler-rt/trunk/lib/fuzzer/FuzzerDataFlowTrace.cpp
> > URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/fuzzer/FuzzerDataFlowTrace.cpp?rev=363326&r1=363325&r2=363326&view=diff
> > ==============================================================================
> > --- compiler-rt/trunk/lib/fuzzer/FuzzerDataFlowTrace.cpp (original)
> > +++ compiler-rt/trunk/lib/fuzzer/FuzzerDataFlowTrace.cpp Thu Jun 13 14:17:49 2019
>
> > @@ -246,74 +240,24 @@ int CollectDataFlow(const std::string &D
> >                     const Vector<SizedFile> &CorporaFiles) {
> >   Printf("INFO: collecting data flow: bin: %s dir: %s files: %zd\n",
> >          DFTBinary.c_str(), DirPath.c_str(), CorporaFiles.size());
> > +  setenv("DFSAN_OPTIONS", "fast16labels=1:warn_unimplemented=0", 1);
> >   MkDir(DirPath);
>
> On windows, setenv isn't available - only putenv is. While libfuzzer might
> not actually support windows, it's still being built, at least for MinGW.

Also for MSVC. I've reverted in r363358 until this can be figured out.