[libFuzzer] Delete llvm/lib/Fuzzer

Summary: Code is already in compiler-rt

Reviewers: kcc

Subscribers: krytarowski, llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D38912

llvm-svn: 315937

1 files changed, 0 insertions, 722 deletions

diff --git a/llvm/lib/Fuzzer/FuzzerLoop.cpp b/llvm/lib/Fuzzer/FuzzerLoop.cpp
deleted file mode 100644
index 2349459..0000000
--- a/llvm/lib/Fuzzer/FuzzerLoop.cpp
+++ /dev/null
@@ -1,722 +0,0 @@
-//===- FuzzerLoop.cpp - Fuzzer's main loop --------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-// Fuzzer's main loop.
-//===----------------------------------------------------------------------===//
-
-#include "FuzzerCorpus.h"
-#include "FuzzerIO.h"
-#include "FuzzerInternal.h"
-#include "FuzzerMutate.h"
-#include "FuzzerRandom.h"
-#include "FuzzerShmem.h"
-#include "FuzzerTracePC.h"
-#include <algorithm>
-#include <cstring>
-#include <memory>
-#include <set>
-
-#if defined(__has_include)
-#if __has_include(<sanitizer / lsan_interface.h>)
-#include <sanitizer/lsan_interface.h>
-#endif
-#endif
-
-#define NO_SANITIZE_MEMORY
-#if defined(__has_feature)
-#if __has_feature(memory_sanitizer)
-#undef NO_SANITIZE_MEMORY
-#define NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory))
-#endif
-#endif
-
-namespace fuzzer {
-static const size_t kMaxUnitSizeToPrint = 256;
-
-thread_local bool Fuzzer::IsMyThread;
-
-SharedMemoryRegion SMR;
-
-// Only one Fuzzer per process.
-static Fuzzer *F;
-
-// Leak detection is expensive, so we first check if there were more mallocs
-// than frees (using the sanitizer malloc hooks) and only then try to call lsan.
-struct MallocFreeTracer {
-  void Start(int TraceLevel) {
-    this->TraceLevel = TraceLevel;
-    if (TraceLevel)
-      Printf("MallocFreeTracer: START\n");
-    Mallocs = 0;
-    Frees = 0;
-  }
-  // Returns true if there were more mallocs than frees.
-  bool Stop() {
-    if (TraceLevel)
-      Printf("MallocFreeTracer: STOP %zd %zd (%s)\n", Mallocs.load(),
-             Frees.load(), Mallocs == Frees ? "same" : "DIFFERENT");
-    bool Result = Mallocs > Frees;
-    Mallocs = 0;
-    Frees = 0;
-    TraceLevel = 0;
-    return Result;
-  }
-  std::atomic<size_t> Mallocs;
-  std::atomic<size_t> Frees;
-  int TraceLevel = 0;
-};
-
-static MallocFreeTracer AllocTracer;
-
-ATTRIBUTE_NO_SANITIZE_MEMORY
-void MallocHook(const volatile void *ptr, size_t size) {
-  size_t N = AllocTracer.Mallocs++;
-  F->HandleMalloc(size);
-  if (int TraceLevel = AllocTracer.TraceLevel) {
-    Printf("MALLOC[%zd] %p %zd\n", N, ptr, size);
-    if (TraceLevel >= 2 && EF)
-      EF->__sanitizer_print_stack_trace();
-  }
-}
-
-ATTRIBUTE_NO_SANITIZE_MEMORY
-void FreeHook(const volatile void *ptr) {
-  size_t N = AllocTracer.Frees++;
-  if (int TraceLevel = AllocTracer.TraceLevel) {
-    Printf("FREE[%zd]   %p\n", N, ptr);
-    if (TraceLevel >= 2 && EF)
-      EF->__sanitizer_print_stack_trace();
-  }
-}
-
-// Crash on a single malloc that exceeds the rss limit.
-void Fuzzer::HandleMalloc(size_t Size) {
-  if (!Options.RssLimitMb || (Size >> 20) < (size_t)Options.RssLimitMb)
-    return;
-  Printf("==%d== ERROR: libFuzzer: out-of-memory (malloc(%zd))\n", GetPid(),
-         Size);
-  Printf("   To change the out-of-memory limit use -rss_limit_mb=<N>\n\n");
-  if (EF->__sanitizer_print_stack_trace)
-    EF->__sanitizer_print_stack_trace();
-  DumpCurrentUnit("oom-");
-  Printf("SUMMARY: libFuzzer: out-of-memory\n");
-  PrintFinalStats();
-  _Exit(Options.ErrorExitCode); // Stop right now.
-}
-
-Fuzzer::Fuzzer(UserCallback CB, InputCorpus &Corpus, MutationDispatcher &MD,
-               FuzzingOptions Options)
-    : CB(CB), Corpus(Corpus), MD(MD), Options(Options) {
-  if (EF->__sanitizer_set_death_callback)
-    EF->__sanitizer_set_death_callback(StaticDeathCallback);
-  assert(!F);
-  F = this;
-  TPC.ResetMaps();
-  IsMyThread = true;
-  if (Options.DetectLeaks && EF->__sanitizer_install_malloc_and_free_hooks)
-    EF->__sanitizer_install_malloc_and_free_hooks(MallocHook, FreeHook);
-  TPC.SetUseCounters(Options.UseCounters);
-  TPC.SetUseValueProfile(Options.UseValueProfile);
-
-  if (Options.Verbosity)
-    TPC.PrintModuleInfo();
-  if (!Options.OutputCorpus.empty() && Options.ReloadIntervalSec)
-    EpochOfLastReadOfOutputCorpus = GetEpoch(Options.OutputCorpus);
-  MaxInputLen = MaxMutationLen = Options.MaxLen;
-  TmpMaxMutationLen = Max(size_t(4), Corpus.MaxInputSize());
-  AllocateCurrentUnitData();
-  CurrentUnitSize = 0;
-  memset(BaseSha1, 0, sizeof(BaseSha1));
-}
-
-Fuzzer::~Fuzzer() { }
-
-void Fuzzer::AllocateCurrentUnitData() {
-  if (CurrentUnitData || MaxInputLen == 0) return;
-  CurrentUnitData = new uint8_t[MaxInputLen];
-}
-
-void Fuzzer::StaticDeathCallback() {
-  assert(F);
-  F->DeathCallback();
-}
-
-void Fuzzer::DumpCurrentUnit(const char *Prefix) {
-  if (!CurrentUnitData) return;  // Happens when running individual inputs.
-  MD.PrintMutationSequence();
-  Printf("; base unit: %s\n", Sha1ToString(BaseSha1).c_str());
-  size_t UnitSize = CurrentUnitSize;
-  if (UnitSize <= kMaxUnitSizeToPrint) {
-    PrintHexArray(CurrentUnitData, UnitSize, "\n");
-    PrintASCII(CurrentUnitData, UnitSize, "\n");
-  }
-  WriteUnitToFileWithPrefix({CurrentUnitData, CurrentUnitData + UnitSize},
-                            Prefix);
-}
-
-NO_SANITIZE_MEMORY
-void Fuzzer::DeathCallback() {
-  DumpCurrentUnit("crash-");
-  PrintFinalStats();
-}
-
-void Fuzzer::StaticAlarmCallback() {
-  assert(F);
-  F->AlarmCallback();
-}
-
-void Fuzzer::StaticCrashSignalCallback() {
-  assert(F);
-  F->CrashCallback();
-}
-
-void Fuzzer::StaticExitCallback() {
-  assert(F);
-  F->ExitCallback();
-}
-
-void Fuzzer::StaticInterruptCallback() {
-  assert(F);
-  F->InterruptCallback();
-}
-
-void Fuzzer::StaticFileSizeExceedCallback() {
-  Printf("==%lu== ERROR: libFuzzer: file size exceeded\n", GetPid());
-  exit(1);
-}
-
-void Fuzzer::CrashCallback() {
-  Printf("==%lu== ERROR: libFuzzer: deadly signal\n", GetPid());
-  if (EF->__sanitizer_print_stack_trace)
-    EF->__sanitizer_print_stack_trace();
-  Printf("NOTE: libFuzzer has rudimentary signal handlers.\n"
-         "      Combine libFuzzer with AddressSanitizer or similar for better "
-         "crash reports.\n");
-  Printf("SUMMARY: libFuzzer: deadly signal\n");
-  DumpCurrentUnit("crash-");
-  PrintFinalStats();
-  _Exit(Options.ErrorExitCode);  // Stop right now.
-}
-
-void Fuzzer::ExitCallback() {
-  if (!RunningCB)
-    return; // This exit did not come from the user callback
-  Printf("==%lu== ERROR: libFuzzer: fuzz target exited\n", GetPid());
-  if (EF->__sanitizer_print_stack_trace)
-    EF->__sanitizer_print_stack_trace();
-  Printf("SUMMARY: libFuzzer: fuzz target exited\n");
-  DumpCurrentUnit("crash-");
-  PrintFinalStats();
-  _Exit(Options.ErrorExitCode);
-}
-
-
-void Fuzzer::InterruptCallback() {
-  Printf("==%lu== libFuzzer: run interrupted; exiting\n", GetPid());
-  PrintFinalStats();
-  _Exit(0);  // Stop right now, don't perform any at-exit actions.
-}
-
-NO_SANITIZE_MEMORY
-void Fuzzer::AlarmCallback() {
-  assert(Options.UnitTimeoutSec > 0);
-  // In Windows Alarm callback is executed by a different thread.
-#if !LIBFUZZER_WINDOWS
-  if (!InFuzzingThread()) return;
-#endif
-  if (!RunningCB)
-    return; // We have not started running units yet.
-  size_t Seconds =
-      duration_cast<seconds>(system_clock::now() - UnitStartTime).count();
-  if (Seconds == 0)
-    return;
-  if (Options.Verbosity >= 2)
-    Printf("AlarmCallback %zd\n", Seconds);
-  if (Seconds >= (size_t)Options.UnitTimeoutSec) {
-    Printf("ALARM: working on the last Unit for %zd seconds\n", Seconds);
-    Printf("       and the timeout value is %d (use -timeout=N to change)\n",
-           Options.UnitTimeoutSec);
-    DumpCurrentUnit("timeout-");
-    Printf("==%lu== ERROR: libFuzzer: timeout after %d seconds\n", GetPid(),
-           Seconds);
-    if (EF->__sanitizer_print_stack_trace)
-      EF->__sanitizer_print_stack_trace();
-    Printf("SUMMARY: libFuzzer: timeout\n");
-    PrintFinalStats();
-    _Exit(Options.TimeoutExitCode); // Stop right now.
-  }
-}
-
-void Fuzzer::RssLimitCallback() {
-  Printf(
-      "==%lu== ERROR: libFuzzer: out-of-memory (used: %zdMb; limit: %zdMb)\n",
-      GetPid(), GetPeakRSSMb(), Options.RssLimitMb);
-  Printf("   To change the out-of-memory limit use -rss_limit_mb=<N>\n\n");
-  if (EF->__sanitizer_print_memory_profile)
-    EF->__sanitizer_print_memory_profile(95, 8);
-  DumpCurrentUnit("oom-");
-  Printf("SUMMARY: libFuzzer: out-of-memory\n");
-  PrintFinalStats();
-  _Exit(Options.ErrorExitCode); // Stop right now.
-}
-
-void Fuzzer::PrintStats(const char *Where, const char *End, size_t Units) {
-  size_t ExecPerSec = execPerSec();
-  if (!Options.Verbosity)
-    return;
-  Printf("#%zd\t%s", TotalNumberOfRuns, Where);
-  if (size_t N = TPC.GetTotalPCCoverage())
-    Printf(" cov: %zd", N);
-  if (size_t N = Corpus.NumFeatures())
-    Printf( " ft: %zd", N);
-  if (!Corpus.empty()) {
-    Printf(" corp: %zd", Corpus.NumActiveUnits());
-    if (size_t N = Corpus.SizeInBytes()) {
-      if (N < (1<<14))
-        Printf("/%zdb", N);
-      else if (N < (1 << 24))
-        Printf("/%zdKb", N >> 10);
-      else
-        Printf("/%zdMb", N >> 20);
-    }
-  }
-  if (Units)
-    Printf(" units: %zd", Units);
-
-  Printf(" exec/s: %zd", ExecPerSec);
-  Printf(" rss: %zdMb", GetPeakRSSMb());
-  Printf("%s", End);
-}
-
-void Fuzzer::PrintFinalStats() {
-  if (Options.PrintCoverage)
-    TPC.PrintCoverage();
-  if (Options.DumpCoverage)
-    TPC.DumpCoverage();
-  if (Options.PrintCorpusStats)
-    Corpus.PrintStats();
-  if (!Options.PrintFinalStats) return;
-  size_t ExecPerSec = execPerSec();
-  Printf("stat::number_of_executed_units: %zd\n", TotalNumberOfRuns);
-  Printf("stat::average_exec_per_sec:     %zd\n", ExecPerSec);
-  Printf("stat::new_units_added:          %zd\n", NumberOfNewUnitsAdded);
-  Printf("stat::slowest_unit_time_sec:    %zd\n", TimeOfLongestUnitInSeconds);
-  Printf("stat::peak_rss_mb:              %zd\n", GetPeakRSSMb());
-}
-
-void Fuzzer::SetMaxInputLen(size_t MaxInputLen) {
-  assert(this->MaxInputLen == 0); // Can only reset MaxInputLen from 0 to non-0.
-  assert(MaxInputLen);
-  this->MaxInputLen = MaxInputLen;
-  this->MaxMutationLen = MaxInputLen;
-  AllocateCurrentUnitData();
-  Printf("INFO: -max_len is not provided; "
-         "libFuzzer will not generate inputs larger than %zd bytes\n",
-         MaxInputLen);
-}
-
-void Fuzzer::SetMaxMutationLen(size_t MaxMutationLen) {
-  assert(MaxMutationLen && MaxMutationLen <= MaxInputLen);
-  this->MaxMutationLen = MaxMutationLen;
-}
-
-void Fuzzer::CheckExitOnSrcPosOrItem() {
-  if (!Options.ExitOnSrcPos.empty()) {
-    static auto *PCsSet = new std::set<uintptr_t>;
-    auto HandlePC = [&](uintptr_t PC) {
-      if (!PCsSet->insert(PC).second) return;
-      std::string Descr = DescribePC("%F %L", PC + 1);
-      if (Descr.find(Options.ExitOnSrcPos) != std::string::npos) {
-        Printf("INFO: found line matching '%s', exiting.\n",
-               Options.ExitOnSrcPos.c_str());
-        _Exit(0);
-      }
-    };
-    TPC.ForEachObservedPC(HandlePC);
-  }
-  if (!Options.ExitOnItem.empty()) {
-    if (Corpus.HasUnit(Options.ExitOnItem)) {
-      Printf("INFO: found item with checksum '%s', exiting.\n",
-             Options.ExitOnItem.c_str());
-      _Exit(0);
-    }
-  }
-}
-
-void Fuzzer::RereadOutputCorpus(size_t MaxSize) {
-  if (Options.OutputCorpus.empty() || !Options.ReloadIntervalSec) return;
-  std::vector<Unit> AdditionalCorpus;
-  ReadDirToVectorOfUnits(Options.OutputCorpus.c_str(), &AdditionalCorpus,
-                         &EpochOfLastReadOfOutputCorpus, MaxSize,
-                         /*ExitOnError*/ false);
-  if (Options.Verbosity >= 2)
-    Printf("Reload: read %zd new units.\n", AdditionalCorpus.size());
-  bool Reloaded = false;
-  for (auto &U : AdditionalCorpus) {
-    if (U.size() > MaxSize)
-      U.resize(MaxSize);
-    if (!Corpus.HasUnit(U)) {
-      if (RunOne(U.data(), U.size())) {
-        CheckExitOnSrcPosOrItem();
-        Reloaded = true;
-      }
-    }
-  }
-  if (Reloaded)
-    PrintStats("RELOAD");
-}
-
-void Fuzzer::ShuffleCorpus(UnitVector *V) {
-  std::shuffle(V->begin(), V->end(), MD.GetRand());
-  if (Options.PreferSmall)
-    std::stable_sort(V->begin(), V->end(), [](const Unit &A, const Unit &B) {
-      return A.size() < B.size();
-    });
-}
-
-void Fuzzer::ShuffleAndMinimize(UnitVector *InitialCorpus) {
-  Printf("#0\tREAD units: %zd\n", InitialCorpus->size());
-  if (Options.ShuffleAtStartUp)
-    ShuffleCorpus(InitialCorpus);
-
-  // Test the callback with empty input and never try it again.
-  uint8_t dummy;
-  ExecuteCallback(&dummy, 0);
-
-  for (auto &U : *InitialCorpus) {
-    RunOne(U.data(), U.size());
-    CheckExitOnSrcPosOrItem();
-    TryDetectingAMemoryLeak(U.data(), U.size(),
-                            /*DuringInitialCorpusExecution*/ true);
-    U.clear();
-  }
-  PrintStats("INITED");
-  if (Corpus.empty()) {
-    Printf("ERROR: no interesting inputs were found. "
-           "Is the code instrumented for coverage? Exiting.\n");
-    exit(1);
-  }
-}
-
-void Fuzzer::PrintPulseAndReportSlowInput(const uint8_t *Data, size_t Size) {
-  auto TimeOfUnit =
-      duration_cast<seconds>(UnitStopTime - UnitStartTime).count();
-  if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)) &&
-      secondsSinceProcessStartUp() >= 2)
-    PrintStats("pulse ");
-  if (TimeOfUnit > TimeOfLongestUnitInSeconds * 1.1 &&
-      TimeOfUnit >= Options.ReportSlowUnits) {
-    TimeOfLongestUnitInSeconds = TimeOfUnit;
-    Printf("Slowest unit: %zd s:\n", TimeOfLongestUnitInSeconds);
-    WriteUnitToFileWithPrefix({Data, Data + Size}, "slow-unit-");
-  }
-}
-
-bool Fuzzer::RunOne(const uint8_t *Data, size_t Size, bool MayDeleteFile,
-                    InputInfo *II) {
-  if (!Size) return false;
-
-  ExecuteCallback(Data, Size);
-
-  UniqFeatureSetTmp.clear();
-  size_t FoundUniqFeaturesOfII = 0;
-  size_t NumUpdatesBefore = Corpus.NumFeatureUpdates();
-  TPC.CollectFeatures([&](size_t Feature) {
-    if (Corpus.AddFeature(Feature, Size, Options.Shrink))
-      UniqFeatureSetTmp.push_back(Feature);
-    if (Options.ReduceInputs && II)
-      if (std::binary_search(II->UniqFeatureSet.begin(),
-                             II->UniqFeatureSet.end(), Feature))
-        FoundUniqFeaturesOfII++;
-  });
-  PrintPulseAndReportSlowInput(Data, Size);
-  size_t NumNewFeatures = Corpus.NumFeatureUpdates() - NumUpdatesBefore;
-  if (NumNewFeatures) {
-    TPC.UpdateObservedPCs();
-    Corpus.AddToCorpus({Data, Data + Size}, NumNewFeatures, MayDeleteFile,
-                       UniqFeatureSetTmp);
-    return true;
-  }
-  if (II && FoundUniqFeaturesOfII &&
-      FoundUniqFeaturesOfII == II->UniqFeatureSet.size() &&
-      II->U.size() > Size) {
-    Corpus.Replace(II, {Data, Data + Size});
-    return true;
-  }
-  return false;
-}
-
-size_t Fuzzer::GetCurrentUnitInFuzzingThead(const uint8_t **Data) const {
-  assert(InFuzzingThread());
-  *Data = CurrentUnitData;
-  return CurrentUnitSize;
-}
-
-void Fuzzer::CrashOnOverwrittenData() {
-  Printf("==%d== ERROR: libFuzzer: fuzz target overwrites it's const input\n",
-         GetPid());
-  DumpCurrentUnit("crash-");
-  Printf("SUMMARY: libFuzzer: out-of-memory\n");
-  _Exit(Options.ErrorExitCode); // Stop right now.
-}
-
-// Compare two arrays, but not all bytes if the arrays are large.
-static bool LooseMemeq(const uint8_t *A, const uint8_t *B, size_t Size) {
-  const size_t Limit = 64;
-  if (Size <= 64)
-    return !memcmp(A, B, Size);
-  // Compare first and last Limit/2 bytes.
-  return !memcmp(A, B, Limit / 2) &&
-         !memcmp(A + Size - Limit / 2, B + Size - Limit / 2, Limit / 2);
-}
-
-void Fuzzer::ExecuteCallback(const uint8_t *Data, size_t Size) {
-  TPC.RecordInitialStack();
-  TotalNumberOfRuns++;
-  assert(InFuzzingThread());
-  if (SMR.IsClient())
-    SMR.WriteByteArray(Data, Size);
-  // We copy the contents of Unit into a separate heap buffer
-  // so that we reliably find buffer overflows in it.
-  uint8_t *DataCopy = new uint8_t[Size];
-  memcpy(DataCopy, Data, Size);
-  if (CurrentUnitData && CurrentUnitData != Data)
-    memcpy(CurrentUnitData, Data, Size);
-  CurrentUnitSize = Size;
-  AllocTracer.Start(Options.TraceMalloc);
-  UnitStartTime = system_clock::now();
-  TPC.ResetMaps();
-  RunningCB = true;
-  int Res = CB(DataCopy, Size);
-  RunningCB = false;
-  UnitStopTime = system_clock::now();
-  (void)Res;
-  assert(Res == 0);
-  HasMoreMallocsThanFrees = AllocTracer.Stop();
-  if (!LooseMemeq(DataCopy, Data, Size))
-    CrashOnOverwrittenData();
-  CurrentUnitSize = 0;
-  delete[] DataCopy;
-}
-
-void Fuzzer::WriteToOutputCorpus(const Unit &U) {
-  if (Options.OnlyASCII)
-    assert(IsASCII(U));
-  if (Options.OutputCorpus.empty())
-    return;
-  std::string Path = DirPlusFile(Options.OutputCorpus, Hash(U));
-  WriteToFile(U, Path);
-  if (Options.Verbosity >= 2)
-    Printf("Written %zd bytes to %s\n", U.size(), Path.c_str());
-}
-
-void Fuzzer::WriteUnitToFileWithPrefix(const Unit &U, const char *Prefix) {
-  if (!Options.SaveArtifacts)
-    return;
-  std::string Path = Options.ArtifactPrefix + Prefix + Hash(U);
-  if (!Options.ExactArtifactPath.empty())
-    Path = Options.ExactArtifactPath; // Overrides ArtifactPrefix.
-  WriteToFile(U, Path);
-  Printf("artifact_prefix='%s'; Test unit written to %s\n",
-         Options.ArtifactPrefix.c_str(), Path.c_str());
-  if (U.size() <= kMaxUnitSizeToPrint)
-    Printf("Base64: %s\n", Base64(U).c_str());
-}
-
-void Fuzzer::PrintStatusForNewUnit(const Unit &U, const char *Text) {
-  if (!Options.PrintNEW)
-    return;
-  PrintStats(Text, "");
-  if (Options.Verbosity) {
-    Printf(" L: %zd/%zd ", U.size(), Corpus.MaxInputSize());
-    MD.PrintMutationSequence();
-    Printf("\n");
-  }
-}
-
-void Fuzzer::ReportNewCoverage(InputInfo *II, const Unit &U) {
-  II->NumSuccessfullMutations++;
-  MD.RecordSuccessfulMutationSequence();
-  PrintStatusForNewUnit(U, II->Reduced ? "REDUCE" :
-                                         "NEW   ");
-  WriteToOutputCorpus(U);
-  NumberOfNewUnitsAdded++;
-  CheckExitOnSrcPosOrItem();  // Check only after the unit is saved to corpus.
-  LastCorpusUpdateRun = TotalNumberOfRuns;
-  LastCorpusUpdateTime = system_clock::now();
-}
-
-// Tries detecting a memory leak on the particular input that we have just
-// executed before calling this function.
-void Fuzzer::TryDetectingAMemoryLeak(const uint8_t *Data, size_t Size,
-                                     bool DuringInitialCorpusExecution) {
-  if (!HasMoreMallocsThanFrees) return;  // mallocs==frees, a leak is unlikely.
-  if (!Options.DetectLeaks) return;
-  if (!&(EF->__lsan_enable) || !&(EF->__lsan_disable) ||
-      !(EF->__lsan_do_recoverable_leak_check))
-    return;  // No lsan.
-  // Run the target once again, but with lsan disabled so that if there is
-  // a real leak we do not report it twice.
-  EF->__lsan_disable();
-  ExecuteCallback(Data, Size);
-  EF->__lsan_enable();
-  if (!HasMoreMallocsThanFrees) return;  // a leak is unlikely.
-  if (NumberOfLeakDetectionAttempts++ > 1000) {
-    Options.DetectLeaks = false;
-    Printf("INFO: libFuzzer disabled leak detection after every mutation.\n"
-           "      Most likely the target function accumulates allocated\n"
-           "      memory in a global state w/o actually leaking it.\n"
-           "      You may try running this binary with -trace_malloc=[12]"
-           "      to get a trace of mallocs and frees.\n"
-           "      If LeakSanitizer is enabled in this process it will still\n"
-           "      run on the process shutdown.\n");
-    return;
-  }
-  // Now perform the actual lsan pass. This is expensive and we must ensure
-  // we don't call it too often.
-  if (EF->__lsan_do_recoverable_leak_check()) { // Leak is found, report it.
-    if (DuringInitialCorpusExecution)
-      Printf("\nINFO: a leak has been found in the initial corpus.\n\n");
-    Printf("INFO: to ignore leaks on libFuzzer side use -detect_leaks=0.\n\n");
-    CurrentUnitSize = Size;
-    DumpCurrentUnit("leak-");
-    PrintFinalStats();
-    _Exit(Options.ErrorExitCode);  // not exit() to disable lsan further on.
-  }
-}
-
-void Fuzzer::MutateAndTestOne() {
-  MD.StartMutationSequence();
-
-  auto &II = Corpus.ChooseUnitToMutate(MD.GetRand());
-  const auto &U = II.U;
-  memcpy(BaseSha1, II.Sha1, sizeof(BaseSha1));
-  assert(CurrentUnitData);
-  size_t Size = U.size();
-  assert(Size <= MaxInputLen && "Oversized Unit");
-  memcpy(CurrentUnitData, U.data(), Size);
-
-  assert(MaxMutationLen > 0);
-
-  size_t CurrentMaxMutationLen =
-      Min(MaxMutationLen, Max(U.size(), TmpMaxMutationLen));
-  assert(CurrentMaxMutationLen > 0);
-
-  for (int i = 0; i < Options.MutateDepth; i++) {
-    if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
-      break;
-    size_t NewSize = 0;
-    NewSize = MD.Mutate(CurrentUnitData, Size, CurrentMaxMutationLen);
-    assert(NewSize > 0 && "Mutator returned empty unit");
-    assert(NewSize <= CurrentMaxMutationLen && "Mutator return overisized unit");
-    Size = NewSize;
-    II.NumExecutedMutations++;
-    if (RunOne(CurrentUnitData, Size, /*MayDeleteFile=*/true, &II))
-      ReportNewCoverage(&II, {CurrentUnitData, CurrentUnitData + Size});
-
-    TryDetectingAMemoryLeak(CurrentUnitData, Size,
-                            /*DuringInitialCorpusExecution*/ false);
-  }
-}
-
-void Fuzzer::Loop() {
-  TPC.SetPrintNewPCs(Options.PrintNewCovPcs);
-  system_clock::time_point LastCorpusReload = system_clock::now();
-  if (Options.DoCrossOver)
-    MD.SetCorpus(&Corpus);
-  while (true) {
-    auto Now = system_clock::now();
-    if (duration_cast<seconds>(Now - LastCorpusReload).count() >=
-        Options.ReloadIntervalSec) {
-      RereadOutputCorpus(MaxInputLen);
-      LastCorpusReload = system_clock::now();
-    }
-    if (TotalNumberOfRuns >= Options.MaxNumberOfRuns)
-      break;
-    if (TimedOut()) break;
-
-    // Update TmpMaxMutationLen
-    if (Options.ExperimentalLenControl) {
-      if (TmpMaxMutationLen < MaxMutationLen &&
-        (TotalNumberOfRuns - LastCorpusUpdateRun > 1000 &&
-        duration_cast<seconds>(Now - LastCorpusUpdateTime).count() >= 1)) {
-        LastCorpusUpdateRun = TotalNumberOfRuns;
-        LastCorpusUpdateTime = Now;
-        TmpMaxMutationLen =
-            Min(MaxMutationLen,
-                TmpMaxMutationLen + Max(size_t(4), TmpMaxMutationLen / 8));
-        if (TmpMaxMutationLen <= MaxMutationLen)
-          Printf("#%zd\tTEMP_MAX_LEN: %zd\n", TotalNumberOfRuns,
-                 TmpMaxMutationLen);
-      }
-    } else {
-      TmpMaxMutationLen = MaxMutationLen;
-    }
-
-    // Perform several mutations and runs.
-    MutateAndTestOne();
-  }
-
-  PrintStats("DONE  ", "\n");
-  MD.PrintRecommendedDictionary();
-}
-
-void Fuzzer::MinimizeCrashLoop(const Unit &U) {
-  if (U.size() <= 1) return;
-  while (!TimedOut() && TotalNumberOfRuns < Options.MaxNumberOfRuns) {
-    MD.StartMutationSequence();
-    memcpy(CurrentUnitData, U.data(), U.size());
-    for (int i = 0; i < Options.MutateDepth; i++) {
-      size_t NewSize = MD.Mutate(CurrentUnitData, U.size(), MaxMutationLen);
-      assert(NewSize > 0 && NewSize <= MaxMutationLen);
-      ExecuteCallback(CurrentUnitData, NewSize);
-      PrintPulseAndReportSlowInput(CurrentUnitData, NewSize);
-      TryDetectingAMemoryLeak(CurrentUnitData, NewSize,
-                              /*DuringInitialCorpusExecution*/ false);
-    }
-  }
-}
-
-void Fuzzer::AnnounceOutput(const uint8_t *Data, size_t Size) {
-  if (SMR.IsServer()) {
-    SMR.WriteByteArray(Data, Size);
-  } else if (SMR.IsClient()) {
-    SMR.PostClient();
-    SMR.WaitServer();
-    size_t OtherSize = SMR.ReadByteArraySize();
-    uint8_t *OtherData = SMR.GetByteArray();
-    if (Size != OtherSize || memcmp(Data, OtherData, Size) != 0) {
-      size_t i = 0;
-      for (i = 0; i < Min(Size, OtherSize); i++)
-        if (Data[i] != OtherData[i])
-          break;
-      Printf("==%lu== ERROR: libFuzzer: equivalence-mismatch. Sizes: %zd %zd; "
-             "offset %zd\n", GetPid(), Size, OtherSize, i);
-      DumpCurrentUnit("mismatch-");
-      Printf("SUMMARY: libFuzzer: equivalence-mismatch\n");
-      PrintFinalStats();
-      _Exit(Options.ErrorExitCode);
-    }
-  }
-}
-
-} // namespace fuzzer
-
-extern "C" {
-
-size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize) {
-  assert(fuzzer::F);
-  return fuzzer::F->GetMD().DefaultMutate(Data, Size, MaxSize);
-}
-
-// Experimental
-void LLVMFuzzerAnnounceOutput(const uint8_t *Data, size_t Size) {
-  assert(fuzzer::F);
-  fuzzer::F->AnnounceOutput(Data, Size);
-}
-}  // extern "C"