1 //===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // Define the main class fuzzer::Fuzzer and most functions.
10 //===----------------------------------------------------------------------===//
18 #include <unordered_set>
20 #include "FuzzerInterface.h"
23 typedef std::vector<uint8_t> Unit;
24 using namespace std::chrono;
26 Unit ReadFile(const char *Path);
27 void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V);
28 void WriteToFile(const Unit &U, const std::string &Path);
29 void CopyFileToErr(const std::string &Path);
30 // Returns "Dir/FileName" or equivalent for the current OS.
31 std::string DirPlusFile(const std::string &DirPath,
32 const std::string &FileName);
34 void Mutate(Unit *U, size_t MaxLen);
36 void CrossOver(const Unit &A, const Unit &B, Unit *U, size_t MaxLen);
38 void Print(const Unit &U, const char *PrintAfter = "");
39 void PrintASCII(const Unit &U, const char *PrintAfter = "");
40 std::string Hash(const Unit &U);
41 void SetTimer(int Seconds);
45 struct FuzzingOptions {
48 bool DoCrossOver = true;
50 bool ExitOnFirst = false;
51 bool UseCounters = false;
52 bool UseFullCoverageSet = false;
53 bool UseCoveragePairs = false;
54 int PreferSmallDuringInitialShuffle = -1;
55 size_t MaxNumberOfRuns = ULONG_MAX;
56 std::string OutputCorpus;
58 Fuzzer(UserCallback Callback, FuzzingOptions Options)
59 : Callback(Callback), Options(Options) {
62 void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
63 size_t Loop(size_t NumIterations);
64 void ShuffleAndMinimize();
65 size_t CorpusSize() const { return Corpus.size(); }
66 void ReadDir(const std::string &Path) {
67 ReadDirToVectorOfUnits(Path.c_str(), &Corpus);
69 // Save the current corpus to OutputCorpus.
72 size_t secondsSinceProcessStartUp() {
73 return duration_cast<seconds>(system_clock::now() - ProcessStartTime)
77 size_t getTotalNumberOfRuns() { return TotalNumberOfRuns; }
79 static void AlarmCallback();
82 size_t MutateAndTestOne(Unit *U);
83 size_t RunOne(const Unit &U);
84 size_t RunOneMaximizeTotalCoverage(const Unit &U);
85 size_t RunOneMaximizeFullCoverageSet(const Unit &U);
86 size_t RunOneMaximizeCoveragePairs(const Unit &U);
87 void WriteToOutputCorpus(const Unit &U);
88 static void WriteToCrash(const Unit &U, const char *Prefix);
90 void SetDeathCallback();
91 static void DeathCallback();
92 static Unit CurrentUnit;
94 size_t TotalNumberOfRuns = 0;
96 std::vector<Unit> Corpus;
97 std::unordered_set<uintptr_t> FullCoverageSets;
98 std::unordered_set<uint64_t> CoveragePairs;
101 std::vector<uint8_t> CounterBitmap;
102 size_t TotalBits() { // Slow. Call it only for printing stats.
104 for (auto x : CounterBitmap) Res += __builtin_popcount(x);
108 UserCallback Callback;
109 FuzzingOptions Options;
110 system_clock::time_point ProcessStartTime = system_clock::now();
111 static system_clock::time_point UnitStartTime;
114 }; // namespace fuzzer