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diff --git a/gnu/llvm/lib/Fuzzer/FuzzerInterface.h b/gnu/llvm/lib/Fuzzer/FuzzerInterface.h
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+//===- FuzzerInterface.h - Interface 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 interface between the Fuzzer and the library being tested.
+//===----------------------------------------------------------------------===//
+
+// WARNING: keep the interface free of STL or any other header-based C++ lib,
+// to avoid bad interactions between the code used in the fuzzer and
+// the code used in the target function.
+
+#ifndef LLVM_FUZZER_INTERFACE_H
+#define LLVM_FUZZER_INTERFACE_H
+
+#include <limits>
+#include <cstddef>
+#include <cstdint>
+#include <vector>
+#include <string>
+
+namespace fuzzer {
+typedef std::vector<uint8_t> Unit;
+
+/// Returns an int 0. Values other than zero are reserved for future.
+typedef int (*UserCallback)(const uint8_t *Data, size_t Size);
+/** Simple C-like interface with a single user-supplied callback.
+
+Usage:
+
+#\code
+#include "FuzzerInterface.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  DoStuffWithData(Data, Size);
+  return 0;
+}
+
+// Implement your own main() or use the one from FuzzerMain.cpp.
+int main(int argc, char **argv) {
+  InitializeMeIfNeeded();
+  return fuzzer::FuzzerDriver(argc, argv, LLVMFuzzerTestOneInput);
+}
+#\endcode
+*/
+int FuzzerDriver(int argc, char **argv, UserCallback Callback);
+
+class FuzzerRandomBase {
+ public:
+  FuzzerRandomBase(){}
+  virtual ~FuzzerRandomBase(){};
+  virtual void ResetSeed(unsigned int seed) = 0;
+  // Return a random number.
+  virtual size_t Rand() = 0;
+  // Return a random number in range [0,n).
+  size_t operator()(size_t n) { return n ? Rand() % n : 0; }
+  bool RandBool() { return Rand() % 2; }
+};
+
+class FuzzerRandomLibc : public FuzzerRandomBase {
+ public:
+  FuzzerRandomLibc(unsigned int seed) { ResetSeed(seed); }
+  void ResetSeed(unsigned int seed) override;
+  ~FuzzerRandomLibc() override {}
+  size_t Rand() override;
+};
+
+class MutationDispatcher {
+ public:
+  MutationDispatcher(FuzzerRandomBase &Rand);
+  ~MutationDispatcher();
+  /// Indicate that we are about to start a new sequence of mutations.
+  void StartMutationSequence();
+  /// Print the current sequence of mutations.
+  void PrintMutationSequence();
+  /// Mutates data by shuffling bytes.
+  size_t Mutate_ShuffleBytes(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by erasing a byte.
+  size_t Mutate_EraseByte(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by inserting a byte.
+  size_t Mutate_InsertByte(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by chanding one byte.
+  size_t Mutate_ChangeByte(uint8_t *Data, size_t Size, size_t MaxSize);
+  /// Mutates data by chanding one bit.
+  size_t Mutate_ChangeBit(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Mutates data by adding a word from the manual dictionary.
+  size_t Mutate_AddWordFromManualDictionary(uint8_t *Data, size_t Size,
+                                            size_t MaxSize);
+
+  /// Mutates data by adding a word from the automatic dictionary.
+  size_t Mutate_AddWordFromAutoDictionary(uint8_t *Data, size_t Size,
+                                          size_t MaxSize);
+
+  /// Tries to find an ASCII integer in Data, changes it to another ASCII int.
+  size_t Mutate_ChangeASCIIInteger(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// CrossOver Data with some other element of the corpus.
+  size_t Mutate_CrossOver(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Applies one of the above mutations.
+  /// Returns the new size of data which could be up to MaxSize.
+  size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize);
+
+  /// Creates a cross-over of two pieces of Data, returns its size.
+  size_t CrossOver(const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
+                   size_t Size2, uint8_t *Out, size_t MaxOutSize);
+
+  void AddWordToManualDictionary(const Unit &Word);
+
+  void AddWordToAutoDictionary(const Unit &Word, size_t PositionHint);
+  void ClearAutoDictionary();
+
+  void SetCorpus(const std::vector<Unit> *Corpus);
+
+ private:
+  FuzzerRandomBase &Rand;
+  struct Impl;
+  Impl *MDImpl;
+};
+
+// For backward compatibility only, deprecated.
+static inline size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize,
+                            FuzzerRandomBase &Rand) {
+  MutationDispatcher MD(Rand);
+  return MD.Mutate(Data, Size, MaxSize);
+}
+
+/** An abstract class that allows to use user-supplied mutators with libFuzzer.
+
+Usage:
+
+#\code
+#include "FuzzerInterface.h"
+class MyFuzzer : public fuzzer::UserSuppliedFuzzer {
+ public:
+  MyFuzzer(fuzzer::FuzzerRandomBase *Rand);
+  // Must define the target function.
+  int TargetFunction(...) { ...; return 0; }
+  // Optionally define the mutator.
+  size_t Mutate(...) { ... }
+  // Optionally define the CrossOver method.
+  size_t CrossOver(...) { ... }
+};
+
+int main(int argc, char **argv) {
+  MyFuzzer F;
+  fuzzer::FuzzerDriver(argc, argv, F);
+}
+#\endcode
+*/
+class UserSuppliedFuzzer {
+ public:
+  UserSuppliedFuzzer(FuzzerRandomBase *Rand);
+  /// Executes the target function on 'Size' bytes of 'Data'.
+  virtual int TargetFunction(const uint8_t *Data, size_t Size) = 0;
+  virtual void StartMutationSequence() { MD.StartMutationSequence(); }
+  virtual void PrintMutationSequence() { MD.PrintMutationSequence(); }
+  virtual void SetCorpus(const std::vector<Unit> *Corpus) {
+    MD.SetCorpus(Corpus);
+  }
+  /// Mutates 'Size' bytes of data in 'Data' inplace into up to 'MaxSize' bytes,
+  /// returns the new size of the data, which should be positive.
+  virtual size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize) {
+    return MD.Mutate(Data, Size, MaxSize);
+  }
+  /// Crosses 'Data1' and 'Data2', writes up to 'MaxOutSize' bytes into Out,
+  /// returns the number of bytes written, which should be positive.
+  virtual size_t CrossOver(const uint8_t *Data1, size_t Size1,
+                           const uint8_t *Data2, size_t Size2,
+                           uint8_t *Out, size_t MaxOutSize) {
+    return MD.CrossOver(Data1, Size1, Data2, Size2, Out, MaxOutSize);
+  }
+  virtual ~UserSuppliedFuzzer();
+
+  FuzzerRandomBase &GetRand() { return *Rand; }
+
+  MutationDispatcher &GetMD() { return MD; }
+
+ private:
+  bool OwnRand = false;
+  FuzzerRandomBase *Rand;
+  MutationDispatcher MD;
+};
+
+/// Runs the fuzzing with the UserSuppliedFuzzer.
+int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF);
+
+/// More C++-ish interface.
+int FuzzerDriver(const std::vector<std::string> &Args, UserSuppliedFuzzer &USF);
+int FuzzerDriver(const std::vector<std::string> &Args, UserCallback Callback);
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_INTERFACE_H