commit 8da9479e40512b3d1069cc5928c8aaca989fc124
author Kostya Serebryany <kcc@google.com> Thu Jan 31 00:09:43 2019 +0000
committer Kostya Serebryany <kcc@google.com> Thu Jan 31 00:09:43 2019 +0000
tree 2230d9b1347d0a97074e066be25309a19e6271af
parent 49c4c68919ae1be62665e6f0a58d97ae6aad1125

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

llvm-svn: 352700

compiler-rt/lib/fuzzer/FuzzerDriver.cpp

diff --git a/compiler-rt/lib/fuzzer/FuzzerDriver.cpp b/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
index 6528d4d..acebd3a 100644
--- a/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
+++ b/compiler-rt/lib/fuzzer/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);