tsan: implement suppressions for top frame only

The new suppression type is called "race_top" and is matched only against top frame in report stacks.
This is required for situations when we want to suppress a race in a "thread pool" or "event loop" implementation.
If we simply use "race:ThreadPool::Execute" suppression, that can suppress everything in the program.

Reviewed in http://reviews.llvm.org/D10686



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@240949 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/tsan/rtl/tsan_suppressions.h b/lib/tsan/rtl/tsan_suppressions.h
index e6d279c33..526952d5b 100644
--- a/lib/tsan/rtl/tsan_suppressions.h
+++ b/lib/tsan/rtl/tsan_suppressions.h
@@ -20,6 +20,7 @@ namespace __tsan {
 
 const char kSuppressionNone[] = "none";
 const char kSuppressionRace[] = "race";
+const char kSuppressionRaceTop[] = "race_top";
 const char kSuppressionMutex[] = "mutex";
 const char kSuppressionThread[] = "thread";
 const char kSuppressionSignal[] = "signal";