vendor/llvm/llvm-trunk-r321017

1 files changed, 0 insertions, 763 deletions

diff --git a/lib/Fuzzer/FuzzerDriver.cpp b/lib/Fuzzer/FuzzerDriver.cpp
deleted file mode 100644
index fd8cab38a7bb..000000000000
--- a/lib/Fuzzer/FuzzerDriver.cpp
+++ /dev/null
@@ -1,763 +0,0 @@
-//===- FuzzerDriver.cpp - FuzzerDriver function and flags -----------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-// FuzzerDriver and flag parsing.
-//===----------------------------------------------------------------------===//
-
-#include "FuzzerCorpus.h"
-#include "FuzzerIO.h"
-#include "FuzzerInterface.h"
-#include "FuzzerInternal.h"
-#include "FuzzerMutate.h"
-#include "FuzzerRandom.h"
-#include "FuzzerShmem.h"
-#include "FuzzerTracePC.h"
-#include <algorithm>
-#include <atomic>
-#include <chrono>
-#include <cstring>
-#include <mutex>
-#include <string>
-#include <thread>
-
-// This function should be present in the libFuzzer so that the client
-// binary can test for its existence.
-extern "C" __attribute__((used)) void __libfuzzer_is_present() {}
-
-namespace fuzzer {
-
-// Program arguments.
-struct FlagDescription {
-  const char *Name;
-  const char *Description;
-  int   Default;
-  int   *IntFlag;
-  const char **StrFlag;
-  unsigned int *UIntFlag;
-};
-
-struct {
-#define FUZZER_DEPRECATED_FLAG(Name)
-#define FUZZER_FLAG_INT(Name, Default, Description) int Name;
-#define FUZZER_FLAG_UNSIGNED(Name, Default, Description) unsigned int Name;
-#define FUZZER_FLAG_STRING(Name, Description) const char *Name;
-#include "FuzzerFlags.def"
-#undef FUZZER_DEPRECATED_FLAG
-#undef FUZZER_FLAG_INT
-#undef FUZZER_FLAG_UNSIGNED
-#undef FUZZER_FLAG_STRING
-} Flags;
-
-static const FlagDescription FlagDescriptions [] {
-#define FUZZER_DEPRECATED_FLAG(Name)                                           \
-  {#Name, "Deprecated; don't use", 0, nullptr, nullptr, nullptr},
-#define FUZZER_FLAG_INT(Name, Default, Description)                            \
-  {#Name, Description, Default, &Flags.Name, nullptr, nullptr},
-#define FUZZER_FLAG_UNSIGNED(Name, Default, Description)                       \
-  {#Name,   Description, static_cast<int>(Default),                            \
-   nullptr, nullptr, &Flags.Name},
-#define FUZZER_FLAG_STRING(Name, Description)                                  \
-  {#Name, Description, 0, nullptr, &Flags.Name, nullptr},
-#include "FuzzerFlags.def"
-#undef FUZZER_DEPRECATED_FLAG
-#undef FUZZER_FLAG_INT
-#undef FUZZER_FLAG_UNSIGNED
-#undef FUZZER_FLAG_STRING
-};
-
-static const size_t kNumFlags =
-    sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
-
-static std::vector<std::string> *Inputs;
-static std::string *ProgName;
-
-static void PrintHelp() {
-  Printf("Usage:\n");
-  auto Prog = ProgName->c_str();
-  Printf("\nTo run fuzzing pass 0 or more directories.\n");
-  Printf("%s [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n", Prog);
-
-  Printf("\nTo run individual tests without fuzzing pass 1 or more files:\n");
-  Printf("%s [-flag1=val1 [-flag2=val2 ...] ] file1 [file2 ...]\n", Prog);
-
-  Printf("\nFlags: (strictly in form -flag=value)\n");
-  size_t MaxFlagLen = 0;
-  for (size_t F = 0; F < kNumFlags; F++)
-    MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
-
-  for (size_t F = 0; F < kNumFlags; F++) {
-    const auto &D = FlagDescriptions[F];
-    if (strstr(D.Description, "internal flag") == D.Description) continue;
-    Printf(" %s", D.Name);
-    for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
-      Printf(" ");
-    Printf("\t");
-    Printf("%d\t%s\n", D.Default, D.Description);
-  }
-  Printf("\nFlags starting with '--' will be ignored and "
-            "will be passed verbatim to subprocesses.\n");
-}
-
-static const char *FlagValue(const char *Param, const char *Name) {
-  size_t Len = strlen(Name);
-  if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
-      Param[Len + 1] == '=')
-      return &Param[Len + 2];
-  return nullptr;
-}
-
-// Avoid calling stol as it triggers a bug in clang/glibc build.
-static long MyStol(const char *Str) {
-  long Res = 0;
-  long Sign = 1;
-  if (*Str == '-') {
-    Str++;
-    Sign = -1;
-  }
-  for (size_t i = 0; Str[i]; i++) {
-    char Ch = Str[i];
-    if (Ch < '0' || Ch > '9')
-      return Res;
-    Res = Res * 10 + (Ch - '0');
-  }
-  return Res * Sign;
-}
-
-static bool ParseOneFlag(const char *Param) {
-  if (Param[0] != '-') return false;
-  if (Param[1] == '-') {
-    static bool PrintedWarning = false;
-    if (!PrintedWarning) {
-      PrintedWarning = true;
-      Printf("INFO: libFuzzer ignores flags that start with '--'\n");
-    }
-    for (size_t F = 0; F < kNumFlags; F++)
-      if (FlagValue(Param + 1, FlagDescriptions[F].Name))
-        Printf("WARNING: did you mean '%s' (single dash)?\n", Param + 1);
-    return true;
-  }
-  for (size_t F = 0; F < kNumFlags; F++) {
-    const char *Name = FlagDescriptions[F].Name;
-    const char *Str = FlagValue(Param, Name);
-    if (Str)  {
-      if (FlagDescriptions[F].IntFlag) {
-        int Val = MyStol(Str);
-        *FlagDescriptions[F].IntFlag = Val;
-        if (Flags.verbosity >= 2)
-          Printf("Flag: %s %d\n", Name, Val);
-        return true;
-      } else if (FlagDescriptions[F].UIntFlag) {
-        unsigned int Val = std::stoul(Str);
-        *FlagDescriptions[F].UIntFlag = Val;
-        if (Flags.verbosity >= 2)
-          Printf("Flag: %s %u\n", Name, Val);
-        return true;
-      } else if (FlagDescriptions[F].StrFlag) {
-        *FlagDescriptions[F].StrFlag = Str;
-        if (Flags.verbosity >= 2)
-          Printf("Flag: %s %s\n", Name, Str);
-        return true;
-      } else {  // Deprecated flag.
-        Printf("Flag: %s: deprecated, don't use\n", Name);
-        return true;
-      }
-    }
-  }
-  Printf("\n\nWARNING: unrecognized flag '%s'; "
-         "use -help=1 to list all flags\n\n", Param);
-  return true;
-}
-
-// We don't use any library to minimize dependencies.
-static void ParseFlags(const std::vector<std::string> &Args) {
-  for (size_t F = 0; F < kNumFlags; F++) {
-    if (FlagDescriptions[F].IntFlag)
-      *FlagDescriptions[F].IntFlag = FlagDescriptions[F].Default;
-    if (FlagDescriptions[F].UIntFlag)
-      *FlagDescriptions[F].UIntFlag =
-          static_cast<unsigned int>(FlagDescriptions[F].Default);
-    if (FlagDescriptions[F].StrFlag)
-      *FlagDescriptions[F].StrFlag = nullptr;
-  }
-  Inputs = new std::vector<std::string>;
-  for (size_t A = 1; A < Args.size(); A++) {
-    if (ParseOneFlag(Args[A].c_str())) {
-      if (Flags.ignore_remaining_args)
-        break;
-      continue;
-    }
-    Inputs->push_back(Args[A]);
-  }
-}
-
-static std::mutex Mu;
-
-static void PulseThread() {
-  while (true) {
-    SleepSeconds(600);
-    std::lock_guard<std::mutex> Lock(Mu);
-    Printf("pulse...\n");
-  }
-}
-
-static void WorkerThread(const std::string &Cmd, std::atomic<unsigned> *Counter,
-                         unsigned NumJobs, std::atomic<bool> *HasErrors) {
-  while (true) {
-    unsigned C = (*Counter)++;
-    if (C >= NumJobs) break;
-    std::string Log = "fuzz-" + std::to_string(C) + ".log";
-    std::string ToRun = Cmd + " > " + Log + " 2>&1\n";
-    if (Flags.verbosity)
-      Printf("%s", ToRun.c_str());
-    int ExitCode = ExecuteCommand(ToRun);
-    if (ExitCode != 0)
-      *HasErrors = true;
-    std::lock_guard<std::mutex> Lock(Mu);
-    Printf("================== Job %u exited with exit code %d ============\n",
-           C, ExitCode);
-    fuzzer::CopyFileToErr(Log);
-  }
-}
-
-std::string CloneArgsWithoutX(const std::vector<std::string> &Args,
-                              const char *X1, const char *X2) {
-  std::string Cmd;
-  for (auto &S : Args) {
-    if (FlagValue(S.c_str(), X1) || FlagValue(S.c_str(), X2))
-      continue;
-    Cmd += S + " ";
-  }
-  return Cmd;
-}
-
-static int RunInMultipleProcesses(const std::vector<std::string> &Args,
-                                  unsigned NumWorkers, unsigned NumJobs) {
-  std::atomic<unsigned> Counter(0);
-  std::atomic<bool> HasErrors(false);
-  std::string Cmd = CloneArgsWithoutX(Args, "jobs", "workers");
-  std::vector<std::thread> V;
-  std::thread Pulse(PulseThread);
-  Pulse.detach();
-  for (unsigned i = 0; i < NumWorkers; i++)
-    V.push_back(std::thread(WorkerThread, Cmd, &Counter, NumJobs, &HasErrors));
-  for (auto &T : V)
-    T.join();
-  return HasErrors ? 1 : 0;
-}
-
-static void RssThread(Fuzzer *F, size_t RssLimitMb) {
-  while (true) {
-    SleepSeconds(1);
-    size_t Peak = GetPeakRSSMb();
-    if (Peak > RssLimitMb)
-      F->RssLimitCallback();
-  }
-}
-
-static void StartRssThread(Fuzzer *F, size_t RssLimitMb) {
-  if (!RssLimitMb) return;
-  std::thread T(RssThread, F, RssLimitMb);
-  T.detach();
-}
-
-int RunOneTest(Fuzzer *F, const char *InputFilePath, size_t MaxLen) {
-  Unit U = FileToVector(InputFilePath);
-  if (MaxLen && MaxLen < U.size())
-    U.resize(MaxLen);
-  F->ExecuteCallback(U.data(), U.size());
-  F->TryDetectingAMemoryLeak(U.data(), U.size(), true);
-  return 0;
-}
-
-static bool AllInputsAreFiles() {
-  if (Inputs->empty()) return false;
-  for (auto &Path : *Inputs)
-    if (!IsFile(Path))
-      return false;
-  return true;
-}
-
-static std::string GetDedupTokenFromFile(const std::string &Path) {
-  auto S = FileToString(Path);
-  auto Beg = S.find("DEDUP_TOKEN:");
-  if (Beg == std::string::npos)
-    return "";
-  auto End = S.find('\n', Beg);
-  if (End == std::string::npos)
-    return "";
-  return S.substr(Beg, End - Beg);
-}
-
-int CleanseCrashInput(const std::vector<std::string> &Args,
-                       const FuzzingOptions &Options) {
-  if (Inputs->size() != 1 || !Flags.exact_artifact_path) {
-    Printf("ERROR: -cleanse_crash should be given one input file and"
-          " -exact_artifact_path\n");
-    exit(1);
-  }
-  std::string InputFilePath = Inputs->at(0);
-  std::string OutputFilePath = Flags.exact_artifact_path;
-  std::string BaseCmd =
-      CloneArgsWithoutX(Args, "cleanse_crash", "cleanse_crash");
-
-  auto InputPos = BaseCmd.find(" " + InputFilePath + " ");
-  assert(InputPos != std::string::npos);
-  BaseCmd.erase(InputPos, InputFilePath.size() + 1);
-
-  auto LogFilePath = DirPlusFile(
-      TmpDir(), "libFuzzerTemp." + std::to_string(GetPid()) + ".txt");
-  auto TmpFilePath = DirPlusFile(
-      TmpDir(), "libFuzzerTemp." + std::to_string(GetPid()) + ".repro");
-  auto LogFileRedirect = " > " + LogFilePath + " 2>&1 ";
-
-  auto Cmd = BaseCmd + " " + TmpFilePath + LogFileRedirect;
-
-  std::string CurrentFilePath = InputFilePath;
-  auto U = FileToVector(CurrentFilePath);
-  size_t Size = U.size();
-
-  const std::vector<uint8_t> ReplacementBytes = {' ', 0xff};
-  for (int NumAttempts = 0; NumAttempts < 5; NumAttempts++) {
-    bool Changed = false;
-    for (size_t Idx = 0; Idx < Size; Idx++) {
-      Printf("CLEANSE[%d]: Trying to replace byte %zd of %zd\n", NumAttempts,
-             Idx, Size);
-      uint8_t OriginalByte = U[Idx];
-      if (ReplacementBytes.end() != std::find(ReplacementBytes.begin(),
-                                              ReplacementBytes.end(),
-                                              OriginalByte))
-        continue;
-      for (auto NewByte : ReplacementBytes) {
-        U[Idx] = NewByte;
-        WriteToFile(U, TmpFilePath);
-        auto ExitCode = ExecuteCommand(Cmd);
-        RemoveFile(TmpFilePath);
-        if (!ExitCode) {
-          U[Idx] = OriginalByte;
-        } else {
-          Changed = true;
-          Printf("CLEANSE: Replaced byte %zd with 0x%x\n", Idx, NewByte);
-          WriteToFile(U, OutputFilePath);
-          break;
-        }
-      }
-    }
-    if (!Changed) break;
-  }
-  RemoveFile(LogFilePath);
-  return 0;
-}
-
-int MinimizeCrashInput(const std::vector<std::string> &Args,
-                       const FuzzingOptions &Options) {
-  if (Inputs->size() != 1) {
-    Printf("ERROR: -minimize_crash should be given one input file\n");
-    exit(1);
-  }
-  std::string InputFilePath = Inputs->at(0);
-  auto BaseCmd = SplitBefore(
-      "-ignore_remaining_args=1",
-      CloneArgsWithoutX(Args, "minimize_crash", "exact_artifact_path"));
-  auto InputPos = BaseCmd.first.find(" " + InputFilePath + " ");
-  assert(InputPos != std::string::npos);
-  BaseCmd.first.erase(InputPos, InputFilePath.size() + 1);
-  if (Flags.runs <= 0 && Flags.max_total_time == 0) {
-    Printf("INFO: you need to specify -runs=N or "
-           "-max_total_time=N with -minimize_crash=1\n"
-           "INFO: defaulting to -max_total_time=600\n");
-    BaseCmd.first += " -max_total_time=600";
-  }
-
-  auto LogFilePath = DirPlusFile(
-      TmpDir(), "libFuzzerTemp." + std::to_string(GetPid()) + ".txt");
-  auto LogFileRedirect = " > " + LogFilePath + " 2>&1 ";
-
-  std::string CurrentFilePath = InputFilePath;
-  while (true) {
-    Unit U = FileToVector(CurrentFilePath);
-    Printf("CRASH_MIN: minimizing crash input: '%s' (%zd bytes)\n",
-           CurrentFilePath.c_str(), U.size());
-
-    auto Cmd = BaseCmd.first + " " + CurrentFilePath + LogFileRedirect + " " +
-               BaseCmd.second;
-
-    Printf("CRASH_MIN: executing: %s\n", Cmd.c_str());
-    int ExitCode = ExecuteCommand(Cmd);
-    if (ExitCode == 0) {
-      Printf("ERROR: the input %s did not crash\n", CurrentFilePath.c_str());
-      exit(1);
-    }
-    Printf("CRASH_MIN: '%s' (%zd bytes) caused a crash. Will try to minimize "
-           "it further\n",
-           CurrentFilePath.c_str(), U.size());
-    auto DedupToken1 = GetDedupTokenFromFile(LogFilePath);
-    if (!DedupToken1.empty())
-      Printf("CRASH_MIN: DedupToken1: %s\n", DedupToken1.c_str());
-
-    std::string ArtifactPath =
-        Flags.exact_artifact_path
-            ? Flags.exact_artifact_path
-            : Options.ArtifactPrefix + "minimized-from-" + Hash(U);
-    Cmd += " -minimize_crash_internal_step=1 -exact_artifact_path=" +
-        ArtifactPath;
-    Printf("CRASH_MIN: executing: %s\n", Cmd.c_str());
-    ExitCode = ExecuteCommand(Cmd);
-    CopyFileToErr(LogFilePath);
-    if (ExitCode == 0) {
-      if (Flags.exact_artifact_path) {
-        CurrentFilePath = Flags.exact_artifact_path;
-        WriteToFile(U, CurrentFilePath);
-      }
-      Printf("CRASH_MIN: failed to minimize beyond %s (%d bytes), exiting\n",
-             CurrentFilePath.c_str(), U.size());
-      break;
-    }
-    auto DedupToken2 = GetDedupTokenFromFile(LogFilePath);
-    if (!DedupToken2.empty())
-      Printf("CRASH_MIN: DedupToken2: %s\n", DedupToken2.c_str());
-
-    if (DedupToken1 != DedupToken2) {
-      if (Flags.exact_artifact_path) {
-        CurrentFilePath = Flags.exact_artifact_path;
-        WriteToFile(U, CurrentFilePath);
-      }
-      Printf("CRASH_MIN: mismatch in dedup tokens"
-             " (looks like a different bug). Won't minimize further\n");
-      break;
-    }
-
-    CurrentFilePath = ArtifactPath;
-    Printf("*********************************\n");
-  }
-  RemoveFile(LogFilePath);
-  return 0;
-}
-
-int MinimizeCrashInputInternalStep(Fuzzer *F, InputCorpus *Corpus) {
-  assert(Inputs->size() == 1);
-  std::string InputFilePath = Inputs->at(0);
-  Unit U = FileToVector(InputFilePath);
-  Printf("INFO: Starting MinimizeCrashInputInternalStep: %zd\n", U.size());
-  if (U.size() < 2) {
-    Printf("INFO: The input is small enough, exiting\n");
-    exit(0);
-  }
-  F->SetMaxInputLen(U.size());
-  F->SetMaxMutationLen(U.size() - 1);
-  F->MinimizeCrashLoop(U);
-  Printf("INFO: Done MinimizeCrashInputInternalStep, no crashes found\n");
-  exit(0);
-  return 0;
-}
-
-int AnalyzeDictionary(Fuzzer *F, const std::vector<Unit>& Dict,
-                      UnitVector& Corpus) {
-  Printf("Started dictionary minimization (up to %d tests)\n",
-         Dict.size() * Corpus.size() * 2);
-
-  // Scores and usage count for each dictionary unit.
-  std::vector<int> Scores(Dict.size());
-  std::vector<int> Usages(Dict.size());
-
-  std::vector<size_t> InitialFeatures;
-  std::vector<size_t> ModifiedFeatures;
-  for (auto &C : Corpus) {
-    // Get coverage for the testcase without modifications.
-    F->ExecuteCallback(C.data(), C.size());
-    InitialFeatures.clear();
-    TPC.CollectFeatures([&](size_t Feature) -> bool {
-      InitialFeatures.push_back(Feature);
-      return true;
-    });
-
-    for (size_t i = 0; i < Dict.size(); ++i) {
-      auto Data = C;
-      auto StartPos = std::search(Data.begin(), Data.end(),
-                                  Dict[i].begin(), Dict[i].end());
-      // Skip dictionary unit, if the testcase does not contain it.
-      if (StartPos == Data.end())
-        continue;
-
-      ++Usages[i];
-      while (StartPos != Data.end()) {
-        // Replace all occurrences of dictionary unit in the testcase.
-        auto EndPos = StartPos + Dict[i].size();
-        for (auto It = StartPos; It != EndPos; ++It)
-          *It ^= 0xFF;
-
-        StartPos = std::search(EndPos, Data.end(),
-                               Dict[i].begin(), Dict[i].end());
-      }
-
-      // Get coverage for testcase with masked occurrences of dictionary unit.
-      F->ExecuteCallback(Data.data(), Data.size());
-      ModifiedFeatures.clear();
-      TPC.CollectFeatures([&](size_t Feature) -> bool {
-        ModifiedFeatures.push_back(Feature);
-        return true;
-      });
-
-      if (InitialFeatures == ModifiedFeatures)
-        --Scores[i];
-      else
-        Scores[i] += 2;
-    }
-  }
-
-  Printf("###### Useless dictionary elements. ######\n");
-  for (size_t i = 0; i < Dict.size(); ++i) {
-    // Dictionary units with positive score are treated as useful ones.
-    if (Scores[i] > 0)
-       continue;
-
-    Printf("\"");
-    PrintASCII(Dict[i].data(), Dict[i].size(), "\"");
-    Printf(" # Score: %d, Used: %d\n", Scores[i], Usages[i]);
-  }
-  Printf("###### End of useless dictionary elements. ######\n");
-  return 0;
-}
-
-int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
-  using namespace fuzzer;
-  assert(argc && argv && "Argument pointers cannot be nullptr");
-  std::string Argv0((*argv)[0]);
-  EF = new ExternalFunctions();
-  if (EF->LLVMFuzzerInitialize)
-    EF->LLVMFuzzerInitialize(argc, argv);
-  const std::vector<std::string> Args(*argv, *argv + *argc);
-  assert(!Args.empty());
-  ProgName = new std::string(Args[0]);
-  if (Argv0 != *ProgName) {
-    Printf("ERROR: argv[0] has been modified in LLVMFuzzerInitialize\n");
-    exit(1);
-  }
-  ParseFlags(Args);
-  if (Flags.help) {
-    PrintHelp();
-    return 0;
-  }
-
-  if (Flags.close_fd_mask & 2)
-    DupAndCloseStderr();
-  if (Flags.close_fd_mask & 1)
-    CloseStdout();
-
-  if (Flags.jobs > 0 && Flags.workers == 0) {
-    Flags.workers = std::min(NumberOfCpuCores() / 2, Flags.jobs);
-    if (Flags.workers > 1)
-      Printf("Running %u workers\n", Flags.workers);
-  }
-
-  if (Flags.workers > 0 && Flags.jobs > 0)
-    return RunInMultipleProcesses(Args, Flags.workers, Flags.jobs);
-
-  const size_t kMaxSaneLen = 1 << 20;
-  const size_t kMinDefaultLen = 4096;
-  FuzzingOptions Options;
-  Options.Verbosity = Flags.verbosity;
-  Options.MaxLen = Flags.max_len;
-  Options.ExperimentalLenControl = Flags.experimental_len_control;
-  if (Flags.experimental_len_control && Flags.max_len == kMinDefaultLen)
-    Options.MaxLen = 1 << 20;
-  Options.UnitTimeoutSec = Flags.timeout;
-  Options.ErrorExitCode = Flags.error_exitcode;
-  Options.TimeoutExitCode = Flags.timeout_exitcode;
-  Options.MaxTotalTimeSec = Flags.max_total_time;
-  Options.DoCrossOver = Flags.cross_over;
-  Options.MutateDepth = Flags.mutate_depth;
-  Options.UseCounters = Flags.use_counters;
-  Options.UseIndirCalls = Flags.use_indir_calls;
-  Options.UseMemmem = Flags.use_memmem;
-  Options.UseCmp = Flags.use_cmp;
-  Options.UseValueProfile = Flags.use_value_profile;
-  Options.Shrink = Flags.shrink;
-  Options.ReduceInputs = Flags.reduce_inputs;
-  Options.ShuffleAtStartUp = Flags.shuffle;
-  Options.PreferSmall = Flags.prefer_small;
-  Options.ReloadIntervalSec = Flags.reload;
-  Options.OnlyASCII = Flags.only_ascii;
-  Options.DetectLeaks = Flags.detect_leaks;
-  Options.TraceMalloc = Flags.trace_malloc;
-  Options.RssLimitMb = Flags.rss_limit_mb;
-  if (Flags.runs >= 0)
-    Options.MaxNumberOfRuns = Flags.runs;
-  if (!Inputs->empty() && !Flags.minimize_crash_internal_step)
-    Options.OutputCorpus = (*Inputs)[0];
-  Options.ReportSlowUnits = Flags.report_slow_units;
-  if (Flags.artifact_prefix)
-    Options.ArtifactPrefix = Flags.artifact_prefix;
-  if (Flags.exact_artifact_path)
-    Options.ExactArtifactPath = Flags.exact_artifact_path;
-  std::vector<Unit> Dictionary;
-  if (Flags.dict)
-    if (!ParseDictionaryFile(FileToString(Flags.dict), &Dictionary))
-      return 1;
-  if (Flags.verbosity > 0 && !Dictionary.empty())
-    Printf("Dictionary: %zd entries\n", Dictionary.size());
-  bool DoPlainRun = AllInputsAreFiles();
-  Options.SaveArtifacts =
-      !DoPlainRun || Flags.minimize_crash_internal_step;
-  Options.PrintNewCovPcs = Flags.print_pcs;
-  Options.PrintFinalStats = Flags.print_final_stats;
-  Options.PrintCorpusStats = Flags.print_corpus_stats;
-  Options.PrintCoverage = Flags.print_coverage;
-  Options.DumpCoverage = Flags.dump_coverage;
-  if (Flags.exit_on_src_pos)
-    Options.ExitOnSrcPos = Flags.exit_on_src_pos;
-  if (Flags.exit_on_item)
-    Options.ExitOnItem = Flags.exit_on_item;
-
-  unsigned Seed = Flags.seed;
-  // Initialize Seed.
-  if (Seed == 0)
-    Seed =
-        std::chrono::system_clock::now().time_since_epoch().count() + GetPid();
-  if (Flags.verbosity)
-    Printf("INFO: Seed: %u\n", Seed);
-
-  Random Rand(Seed);
-  auto *MD = new MutationDispatcher(Rand, Options);
-  auto *Corpus = new InputCorpus(Options.OutputCorpus);
-  auto *F = new Fuzzer(Callback, *Corpus, *MD, Options);
-
-  for (auto &U: Dictionary)
-    if (U.size() <= Word::GetMaxSize())
-      MD->AddWordToManualDictionary(Word(U.data(), U.size()));
-
-  StartRssThread(F, Flags.rss_limit_mb);
-
-  Options.HandleAbrt = Flags.handle_abrt;
-  Options.HandleBus = Flags.handle_bus;
-  Options.HandleFpe = Flags.handle_fpe;
-  Options.HandleIll = Flags.handle_ill;
-  Options.HandleInt = Flags.handle_int;
-  Options.HandleSegv = Flags.handle_segv;
-  Options.HandleTerm = Flags.handle_term;
-  Options.HandleXfsz = Flags.handle_xfsz;
-  SetSignalHandler(Options);
-
-  if (Flags.minimize_crash)
-    return MinimizeCrashInput(Args, Options);
-
-  if (Flags.minimize_crash_internal_step)
-    return MinimizeCrashInputInternalStep(F, Corpus);
-
-  if (Flags.cleanse_crash)
-    return CleanseCrashInput(Args, Options);
-
-  if (auto Name = Flags.run_equivalence_server) {
-    SMR.Destroy(Name);
-    if (!SMR.Create(Name)) {
-       Printf("ERROR: can't create shared memory region\n");
-      return 1;
-    }
-    Printf("INFO: EQUIVALENCE SERVER UP\n");
-    while (true) {
-      SMR.WaitClient();
-      size_t Size = SMR.ReadByteArraySize();
-      SMR.WriteByteArray(nullptr, 0);
-      const Unit tmp(SMR.GetByteArray(), SMR.GetByteArray() + Size);
-      F->ExecuteCallback(tmp.data(), tmp.size());
-      SMR.PostServer();
-    }
-    return 0;
-  }
-
-  if (auto Name = Flags.use_equivalence_server) {
-    if (!SMR.Open(Name)) {
-      Printf("ERROR: can't open shared memory region\n");
-      return 1;
-    }
-    Printf("INFO: EQUIVALENCE CLIENT UP\n");
-  }
-
-  if (DoPlainRun) {
-    Options.SaveArtifacts = false;
-    int Runs = std::max(1, Flags.runs);
-    Printf("%s: Running %zd inputs %d time(s) each.\n", ProgName->c_str(),
-           Inputs->size(), Runs);
-    for (auto &Path : *Inputs) {
-      auto StartTime = system_clock::now();
-      Printf("Running: %s\n", Path.c_str());
-      for (int Iter = 0; Iter < Runs; Iter++)
-        RunOneTest(F, Path.c_str(), Options.MaxLen);
-      auto StopTime = system_clock::now();
-      auto MS = duration_cast<milliseconds>(StopTime - StartTime).count();
-      Printf("Executed %s in %zd ms\n", Path.c_str(), (long)MS);
-    }
-    Printf("***\n"
-           "*** NOTE: fuzzing was not performed, you have only\n"
-           "***       executed the target code on a fixed set of inputs.\n"
-           "***\n");
-    F->PrintFinalStats();
-    exit(0);
-  }
-
-  if (Flags.merge) {
-    if (Options.MaxLen == 0)
-      F->SetMaxInputLen(kMaxSaneLen);
-    if (Flags.merge_control_file)
-      F->CrashResistantMergeInternalStep(Flags.merge_control_file);
-    else
-      F->CrashResistantMerge(Args, *Inputs,
-                             Flags.load_coverage_summary,
-                             Flags.save_coverage_summary);
-    exit(0);
-  }
-
-  size_t TemporaryMaxLen = Options.MaxLen ? Options.MaxLen : kMaxSaneLen;
-
-  UnitVector InitialCorpus;
-  for (auto &Inp : *Inputs) {
-    Printf("Loading corpus dir: %s\n", Inp.c_str());
-    ReadDirToVectorOfUnits(Inp.c_str(), &InitialCorpus, nullptr,
-                           TemporaryMaxLen, /*ExitOnError=*/false);
-  }
-
-  if (Flags.analyze_dict) {
-    if (Dictionary.empty() || Inputs->empty()) {
-      Printf("ERROR: can't analyze dict without dict and corpus provided\n");
-      return 1;
-    }
-    if (AnalyzeDictionary(F, Dictionary, InitialCorpus)) {
-      Printf("Dictionary analysis failed\n");
-      exit(1);
-    }
-    Printf("Dictionary analysis suceeded\n");
-    exit(0);
-  }
-
-  if (Options.MaxLen == 0) {
-    size_t MaxLen = 0;
-    for (auto &U : InitialCorpus)
-      MaxLen = std::max(U.size(), MaxLen);
-    F->SetMaxInputLen(std::min(std::max(kMinDefaultLen, MaxLen), kMaxSaneLen));
-  }
-
-  if (InitialCorpus.empty()) {
-    InitialCorpus.push_back(Unit({'\n'}));  // Valid ASCII input.
-    if (Options.Verbosity)
-      Printf("INFO: A corpus is not provided, starting from an empty corpus\n");
-  }
-  F->ShuffleAndMinimize(&InitialCorpus);
-  InitialCorpus.clear();  // Don't need this memory any more.
-  F->Loop();
-
-  if (Flags.verbosity)
-    Printf("Done %zd runs in %zd second(s)\n", F->getTotalNumberOfRuns(),
-           F->secondsSinceProcessStartUp());
-  F->PrintFinalStats();
-
-  exit(0);  // Don't let F destroy itself.
-}
-
-// Storage for global ExternalFunctions object.
-ExternalFunctions *EF = nullptr;
-
-}  // namespace fuzzer