Generate error reports when a fuzz target exits.

Summary:
Implements https://github.com/google/sanitizers/issues/835.

Flush stdout before exiting in test cases.

Since the atexit hook is used for exit reports, pending prints to
stdout can be lost if they aren't flushed before calling exit().

Expect tests to have non-zero exit code if exit() is called.

Reviewers: vitalybuka, kcc

Reviewed By: kcc

Subscribers: eraman, llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D35602

llvm-svn: 308669

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Fuzzer/FuzzerInternal.h b/llvm/lib/Fuzzer/FuzzerInternal.h
index 3fc3fe004ce..8602818a420 100644
--- a/llvm/lib/Fuzzer/FuzzerInternal.h
+++ b/llvm/lib/Fuzzer/FuzzerInternal.h
@@ -60,6 +60,7 @@ public:
 
   static void StaticAlarmCallback();
   static void StaticCrashSignalCallback();
+  static void StaticExitCallback();
   static void StaticInterruptCallback();
   static void StaticFileSizeExceedCallback();
 
@@ -91,6 +92,7 @@ public:
 private:
   void AlarmCallback();
   void CrashCallback();
+  void ExitCallback();
   void CrashOnOverwrittenData();
   void InterruptCallback();
   void MutateAndTestOne();