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diff --git a/lib/Fuzzer/FuzzerInternal.h b/lib/Fuzzer/FuzzerInternal.h
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index 0000000000000..c387fe7a7c609
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+++ b/lib/Fuzzer/FuzzerInternal.h
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+//===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Define the main class fuzzer::Fuzzer and most functions.
+//===----------------------------------------------------------------------===//
+#include <cassert>
+#include <climits>
+#include <chrono>
+#include <cstddef>
+#include <cstdlib>
+#include <string>
+#include <vector>
+#include <unordered_set>
+
+#include "FuzzerInterface.h"
+
+namespace fuzzer {
+typedef std::vector<uint8_t> Unit;
+using namespace std::chrono;
+
+std::string FileToString(const std::string &Path);
+Unit FileToVector(const std::string &Path);
+void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V,
+                            long *Epoch);
+void WriteToFile(const Unit &U, const std::string &Path);
+void CopyFileToErr(const std::string &Path);
+// Returns "Dir/FileName" or equivalent for the current OS.
+std::string DirPlusFile(const std::string &DirPath,
+                        const std::string &FileName);
+
+size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize);
+
+size_t CrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
+                 size_t Size2, uint8_t *Out, size_t MaxOutSize);
+
+void Printf(const char *Fmt, ...);
+void Print(const Unit &U, const char *PrintAfter = "");
+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;
+// Computes SHA1 hash of 'Len' bytes in 'Data', writes kSHA1NumBytes to 'Out'.
+void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out);
+
+int NumberOfCpuCores();
+
+class Fuzzer {
+ public:
+  struct FuzzingOptions {
+    int Verbosity = 1;
+    int MaxLen = 0;
+    int UnitTimeoutSec = 300;
+    bool DoCrossOver = true;
+    int  MutateDepth = 5;
+    bool ExitOnFirst = false;
+    bool UseCounters = false;
+    bool UseTraces = false;
+    bool UseFullCoverageSet  = false;
+    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(UserSuppliedFuzzer &USF, FuzzingOptions Options);
+  void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
+  void Loop(size_t NumIterations);
+  void ShuffleAndMinimize();
+  void InitializeTraceState();
+  size_t CorpusSize() const { return Corpus.size(); }
+  void ReadDir(const std::string &Path, long *Epoch) {
+    ReadDirToVectorOfUnits(Path.c_str(), &Corpus, Epoch);
+  }
+  void RereadOutputCorpus();
+  // Save the current corpus to OutputCorpus.
+  void SaveCorpus();
+
+  size_t secondsSinceProcessStartUp() {
+    return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
+        .count();
+  }
+
+  size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
+
+  static void StaticAlarmCallback();
+
+  Unit SubstituteTokens(const Unit &U) const;
+
+ private:
+  void AlarmCallback();
+  void ExecuteCallback(const Unit &U);
+  void MutateAndTestOne(Unit *U);
+  void ReportNewCoverage(size_t NewCoverage, const Unit &U);
+  size_t RunOne(const Unit &U);
+  void RunOneAndUpdateCorpus(const Unit &U);
+  size_t RunOneMaximizeTotalCoverage(const Unit &U);
+  size_t RunOneMaximizeFullCoverageSet(const Unit &U);
+  size_t RunOneMaximizeCoveragePairs(const Unit &U);
+  void WriteToOutputCorpus(const Unit &U);
+  void WriteToCrash(const Unit &U, const char *Prefix);
+  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.
+
+  // Start tracing; forget all previously proposed mutations.
+  void StartTraceRecording();
+  // Stop tracing and return the number of proposed mutations.
+  size_t StopTraceRecording();
+  // Apply Idx-th trace-based mutation to U.
+  void ApplyTraceBasedMutation(size_t Idx, Unit *U);
+
+  void SetDeathCallback();
+  static void StaticDeathCallback();
+  void DeathCallback();
+  Unit CurrentUnit;
+
+  size_t TotalNumberOfRuns = 0;
+
+  std::vector<Unit> Corpus;
+  std::unordered_set<std::string> UnitHashesAddedToCorpus;
+  std::unordered_set<uintptr_t> FullCoverageSets;
+
+  // For UseCounters
+  std::vector<uint8_t> CounterBitmap;
+  size_t TotalBits() {  // Slow. Call it only for printing stats.
+    size_t Res = 0;
+    for (auto x : CounterBitmap) Res += __builtin_popcount(x);
+    return Res;
+  }
+
+  UserSuppliedFuzzer &USF;
+  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;
+};
+
+class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {
+ public:
+  SimpleUserSuppliedFuzzer(UserCallback Callback) : Callback(Callback) {}
+  virtual void TargetFunction(const uint8_t *Data, size_t Size) {
+    return Callback(Data, Size);
+  }
+
+ private:
+  UserCallback Callback;
+};
+
+};  // namespace fuzzer