commit da1689319b355d90aee2e2ee434b5a66fde6a5bd
author kcc <kcc> Thu Jan 31 00:09:43 2019 +0000
committer kcc <kcc> Thu Jan 31 00:09:43 2019 +0000
tree b83fd508bafe5a9e559b12e57675d1326c3cf301
parent deea354e0d91c4a756362390fbb501a47dec957f

[libFuzzer] experimental performance optimization -lazy_counters, off by default. Posix-only for now, tested on Linux

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@352700 91177308-0d34-0410-b5e6-96231b3b80d8

FuzzerDriver.cpp

diff --git a/FuzzerDriver.cpp b/FuzzerDriver.cpp
index 6528d4d..acebd3a 100644
--- a/FuzzerDriver.cpp
+++ b/FuzzerDriver.cpp
@@ -658,7 +658,10 @@
   Options.HandleXfsz = Flags.handle_xfsz;
   Options.HandleUsr1 = Flags.handle_usr1;
   Options.HandleUsr2 = Flags.handle_usr2;
+  Options.LazyCounters = Flags.lazy_counters;
   SetSignalHandler(Options);
+  if (Options.LazyCounters)
+    TPC.ProtectLazyCounters();
 
   std::atexit(Fuzzer::StaticExitCallback);