add libfuzzer custom mutator, minor enhancements and fixes

custom_mutators/libfuzzer/FuzzerOptions.h

@@ -0,0 +1,90 @@
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+// fuzzer::FuzzingOptions
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_FUZZER_OPTIONS_H
+#define LLVM_FUZZER_OPTIONS_H
+
+#include "FuzzerDefs.h"
+
+namespace fuzzer {
+
+struct FuzzingOptions {
+  int Verbosity = 1;
+  size_t MaxLen = 0;
+  size_t LenControl = 1000;
+  bool KeepSeed = false;
+  int UnitTimeoutSec = 300;
+  int TimeoutExitCode = 70;
+  int OOMExitCode = 71;
+  int InterruptExitCode = 72;
+  int ErrorExitCode = 77;
+  bool IgnoreTimeouts = true;
+  bool IgnoreOOMs = true;
+  bool IgnoreCrashes = false;
+  int MaxTotalTimeSec = 0;
+  int RssLimitMb = 0;
+  int MallocLimitMb = 0;
+  bool DoCrossOver = true;
+  bool CrossOverUniformDist = false;
+  int MutateDepth = 5;
+  bool ReduceDepth = false;
+  bool UseCounters = false;
+  bool UseMemmem = true;
+  bool UseCmp = false;
+  int UseValueProfile = false;
+  bool Shrink = false;
+  bool ReduceInputs = false;
+  int ReloadIntervalSec = 1;
+  bool ShuffleAtStartUp = true;
+  bool PreferSmall = true;
+  size_t MaxNumberOfRuns = -1L;
+  int ReportSlowUnits = 10;
+  bool OnlyASCII = false;
+  bool Entropic = false;
+  size_t EntropicFeatureFrequencyThreshold = 0xFF;
+  size_t EntropicNumberOfRarestFeatures = 100;
+  bool EntropicScalePerExecTime = false;
+  std::string OutputCorpus;
+  std::string ArtifactPrefix = "./";
+  std::string ExactArtifactPath;
+  std::string ExitOnSrcPos;
+  std::string ExitOnItem;
+  std::string FocusFunction;
+  std::string DataFlowTrace;
+  std::string CollectDataFlow;
+  std::string FeaturesDir;
+  std::string MutationGraphFile;
+  std::string StopFile;
+  bool SaveArtifacts = true;
+  bool PrintNEW = true; // Print a status line when new units are found;
+  bool PrintNewCovPcs = false;
+  int PrintNewCovFuncs = 0;
+  bool PrintFinalStats = false;
+  bool PrintCorpusStats = false;
+  bool PrintCoverage = false;
+  bool DumpCoverage = false;
+  bool DetectLeaks = true;
+  int PurgeAllocatorIntervalSec = 1;
+  int  TraceMalloc = 0;
+  bool HandleAbrt = false;
+  bool HandleAlrm = false;
+  bool HandleBus = false;
+  bool HandleFpe = false;
+  bool HandleIll = false;
+  bool HandleInt = false;
+  bool HandleSegv = false;
+  bool HandleTerm = false;
+  bool HandleXfsz = false;
+  bool HandleUsr1 = false;
+  bool HandleUsr2 = false;
+};
+
+}  // namespace fuzzer
+
+#endif  // LLVM_FUZZER_OPTIONS_H