1 //===- FuzzerMain.cpp - main() function and flags -------------------------===//
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 //===----------------------------------------------------------------------===//
10 //===----------------------------------------------------------------------===//
12 #include "FuzzerInternal.h"
22 struct FlagDescription {
24 const char *Description;
30 #define FUZZER_FLAG(Type, Name, Default, Description) Type Name;
31 #include "FuzzerFlags.def"
35 static FlagDescription FlagDescriptions [] {
36 #define FUZZER_FLAG(Type, Name, Default, Description) {#Name, Description, Default, &Flags.Name},
37 #include "FuzzerFlags.def"
41 static const size_t kNumFlags =
42 sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
44 static std::vector<std::string> inputs;
45 static const char *ProgName;
47 static void PrintHelp() {
48 std::cerr << "Usage: " << ProgName
49 << " [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n";
50 std::cerr << "\nFlags: (strictly in form -flag=value)\n";
51 size_t MaxFlagLen = 0;
52 for (size_t F = 0; F < kNumFlags; F++)
53 MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
55 for (size_t F = 0; F < kNumFlags; F++) {
56 const auto &D = FlagDescriptions[F];
57 std::cerr << " " << D.Name;
58 for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
61 std::cerr << D.Default << "\t" << D.Description << "\n";
65 static const char *FlagValue(const char *Param, const char *Name) {
66 size_t Len = strlen(Name);
67 if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
68 Param[Len + 1] == '=')
69 return &Param[Len + 2];
73 static bool ParseOneFlag(const char *Param) {
74 if (Param[0] != '-') return false;
75 for (size_t F = 0; F < kNumFlags; F++) {
76 const char *Name = FlagDescriptions[F].Name;
77 const char *Str = FlagValue(Param, Name);
79 int Val = std::stol(Str);
80 *FlagDescriptions[F].Flag = Val;
81 if (Flags.verbosity >= 2)
82 std::cerr << "Flag: " << Name << " " << Val << "\n";
90 // We don't use any library to minimize dependencies.
91 static void ParseFlags(int argc, char **argv) {
92 for (size_t F = 0; F < kNumFlags; F++)
93 *FlagDescriptions[F].Flag = FlagDescriptions[F].Default;
94 for (int A = 1; A < argc; A++) {
95 if (ParseOneFlag(argv[A])) continue;
96 inputs.push_back(argv[A]);
100 static void WorkerThread(const std::string &Cmd, std::atomic<int> *Counter,
101 int NumJobs, std::atomic<bool> *HasErrors) {
102 static std::mutex CerrMutex;
104 int C = (*Counter)++;
105 if (C >= NumJobs) break;
106 std::string Log = "fuzz-" + std::to_string(C) + ".log";
107 std::string ToRun = Cmd + " > " + Log + " 2>&1\n";
110 int ExitCode = system(ToRun.c_str());
113 std::lock_guard<std::mutex> Lock(CerrMutex);
114 std::cerr << "================== Job " << C
115 << " exited with exit code " << ExitCode
116 << " =================\n";
117 fuzzer::CopyFileToErr(Log);
121 static int RunInMultipleProcesses(int argc, char **argv, int NumWorkers,
123 std::atomic<int> Counter(0);
124 std::atomic<bool> HasErrors(false);
126 for (int i = 0; i < argc; i++) {
127 if (FlagValue(argv[i], "jobs") || FlagValue(argv[i], "workers")) continue;
131 std::vector<std::thread> V;
132 for (int i = 0; i < NumWorkers; i++)
133 V.push_back(std::thread(WorkerThread, Cmd, &Counter, NumJobs, &HasErrors));
136 return HasErrors ? 1 : 0;
139 int main(int argc, char **argv) {
140 using namespace fuzzer;
143 ParseFlags(argc, argv);
149 if (Flags.workers > 0 && Flags.jobs > 0)
150 return RunInMultipleProcesses(argc, argv, Flags.workers, Flags.jobs);
152 Fuzzer::FuzzingOptions Options;
153 Options.Verbosity = Flags.verbosity;
154 Options.MaxLen = Flags.max_len;
155 Options.DoCrossOver = Flags.cross_over;
156 Options.MutateDepth = Flags.mutate_depth;
157 Options.ExitOnFirst = Flags.exit_on_first;
158 Options.UseFullCoverageSet = Flags.use_full_coverage_set;
159 Options.PreferSmallDuringInitialShuffle =
160 Flags.prefer_small_during_initial_shuffle;
162 Options.MaxNumberOfRuns = Flags.runs;
164 Options.OutputCorpus = inputs[0];
167 unsigned seed = Flags.seed;
170 seed = time(0) * 10000 + getpid();
172 std::cerr << "Seed: " << seed << "\n";
176 if (Flags.timeout > 0)
177 SetTimer(Flags.timeout);
179 for (auto &inp : inputs)
182 if (F.CorpusSize() == 0)
183 F.AddToCorpus(Unit()); // Can't fuzz empty corpus, so add an empty input.
184 F.ShuffleAndMinimize();
185 if (Flags.save_minimized_corpus)
187 F.Loop(Flags.iterations < 0 ? INT_MAX : Flags.iterations);
189 std::cerr << "Done " << F.getTotalNumberOfRuns()
190 << " runs in " << F.secondsSinceProcessStartUp()