[lib/Fuzzer] when -sync_command=<CMD> is given, periodically execute 'CMD CORPUS' to synchronize with other processes

llvm-svn: 237617

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Fuzzer/FuzzerInternal.h b/llvm/lib/Fuzzer/FuzzerInternal.h
index 89261895579..8d6193e9a22 100644
--- a/llvm/lib/Fuzzer/FuzzerInternal.h
+++ b/llvm/lib/Fuzzer/FuzzerInternal.h
@@ -43,6 +43,7 @@ void PrintASCII(const Unit &U, const char *PrintAfter = "");
 std::string Hash(const Unit &U);
 void SetTimer(int Seconds);
 void PrintFileAsBase64(const std::string &Path);
+void ExecuteCommand(const std::string &Command);
 
 // Private copy of SHA1 implementation.
 static const int kSHA1NumBytes = 20;
@@ -66,7 +67,9 @@ class Fuzzer {
     bool Reload = true;
     int PreferSmallDuringInitialShuffle = -1;
     size_t MaxNumberOfRuns = ULONG_MAX;
+    int SyncTimeout = 600;
     std::string OutputCorpus;
+    std::string SyncCommand;
     std::vector<std::string> Tokens;
   };
   Fuzzer(UserCallback Callback, FuzzingOptions Options);
@@ -108,6 +111,8 @@ class Fuzzer {
   void PrintStats(const char *Where, size_t Cov, const char *End = "\n");
   void PrintUnitInASCIIOrTokens(const Unit &U, const char *PrintAfter = "");
 
+  void SyncCorpus();
+
   // Trace-based fuzzing: we run a unit with some kind of tracing
   // enabled and record potentially useful mutations. Then
   // We apply these mutations one by one to the unit and run it again.
@@ -142,6 +147,7 @@ class Fuzzer {
   UserCallback Callback;
   FuzzingOptions Options;
   system_clock::time_point ProcessStartTime = system_clock::now();
+  system_clock::time_point LastExternalSync = system_clock::now();
   system_clock::time_point UnitStartTime;
   long TimeOfLongestUnitInSeconds = 0;
   long EpochOfLastReadOfOutputCorpus = 0;