[PATCH] D66020: [libFuzzer] Merge: print stats after reading the output corpus dir.

[Max Moroz via Phabricator via llvm-commits]

Dor1s created this revision.
Dor1s added reviewers: morehouse, hctim.
Herald added subscribers: llvm-commits, Sanitizers, delcypher.
Herald added projects: LLVM, Sanitizers.

The purpose is to be able to extract the number of new edges added to
the original (i.e. output) corpus directory after doing the merge. Use case
example: in ClusterFuzz, we do merge after every fuzzing session, to avoid
uploading too many corpus files, and we also record coverage stats at that
point. Having a separate line indicating stats after reading the initial output
corpus directory would make the stats extraction easier for both humans and
parsing scripts.

Context: https://github.com/google/clusterfuzz/issues/802.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D66020

Files:
  lib/fuzzer/FuzzerMerge.cpp


Index: lib/fuzzer/FuzzerMerge.cpp
===================================================================
--- lib/fuzzer/FuzzerMerge.cpp
+++ lib/fuzzer/FuzzerMerge.cpp
@@ -239,6 +239,8 @@
     // Show stats.
     if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)))
       PrintStats("pulse ");
+    if (TotalNumberOfRuns == M.NumFilesInFirstCorpus)
+      PrintStats("INITED ");
     // Write the post-run marker and the coverage.
     OF << "FT " << i;
     for (size_t F : UniqFeatures)


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