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"
20 // * don't dump the coverage to disk.
21 extern "C" const char* __asan_default_options() { return "coverage_pcs=0"; }
24 struct FlagDescription {
26 const char *Description;
32 #define FUZZER_FLAG(Type, Name, Default, Description) Type Name;
33 #include "FuzzerFlags.def"
37 static FlagDescription FlagDescriptions [] {
38 #define FUZZER_FLAG(Type, Name, Default, Description) {#Name, Description, Default, &Flags.Name},
39 #include "FuzzerFlags.def"
43 static const size_t kNumFlags =
44 sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
46 static std::vector<std::string> inputs;
47 static const char *ProgName;
49 static void PrintHelp() {
50 std::cerr << "Usage: " << ProgName
51 << " [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n";
52 std::cerr << "\nFlags: (strictly in form -flag=value)\n";
53 size_t MaxFlagLen = 0;
54 for (size_t F = 0; F < kNumFlags; F++)
55 MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
57 for (size_t F = 0; F < kNumFlags; F++) {
58 const auto &D = FlagDescriptions[F];
59 std::cerr << " " << D.Name;
60 for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
63 std::cerr << D.Default << "\t" << D.Description << "\n";
67 static const char *FlagValue(const char *Param, const char *Name) {
68 size_t Len = strlen(Name);
69 if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
70 Param[Len + 1] == '=')
71 return &Param[Len + 2];
75 static bool ParseOneFlag(const char *Param) {
76 if (Param[0] != '-') return false;
77 for (size_t F = 0; F < kNumFlags; F++) {
78 const char *Name = FlagDescriptions[F].Name;
79 const char *Str = FlagValue(Param, Name);
81 int Val = std::stol(Str);
82 *FlagDescriptions[F].Flag = Val;
83 if (Flags.verbosity >= 2)
84 std::cerr << "Flag: " << Name << " " << Val << "\n";
92 // We don't use any library to minimize dependencies.
93 static void ParseFlags(int argc, char **argv) {
94 for (size_t F = 0; F < kNumFlags; F++)
95 *FlagDescriptions[F].Flag = FlagDescriptions[F].Default;
96 for (int A = 1; A < argc; A++) {
97 if (ParseOneFlag(argv[A])) continue;
98 inputs.push_back(argv[A]);
102 int main(int argc, char **argv) {
103 using namespace fuzzer;
106 ParseFlags(argc, argv);
111 Fuzzer::FuzzingOptions Options;
112 Options.Verbosity = Flags.verbosity;
113 Options.MaxLen = Flags.max_len;
114 Options.DoCrossOver = Flags.cross_over;
115 Options.MutateDepth = Flags.mutate_depth;
116 Options.ExitOnFirst = Flags.exit_on_first;
118 Options.OutputCorpus = inputs[0];
121 unsigned seed = Flags.seed;
124 seed = time(0) * 10000 + getpid();
126 std::cerr << "Seed: " << seed << "\n";
130 if (Flags.timeout > 0)
131 SetTimer(Flags.timeout);
133 for (auto &inp : inputs)
136 if (F.CorpusSize() == 0)
137 F.AddToCorpus(Unit()); // Can't fuzz empty corpus, so add an empty input.
138 F.ShuffleAndMinimize();
139 F.Loop(Flags.iterations < 0 ? INT_MAX : Flags.iterations);
141 std::cerr << "Done\n";