1 files changed, 143 insertions, 0 deletions
diff --git a/llvm/lib/Fuzzer/FuzzerMain.cpp b/llvm/lib/Fuzzer/FuzzerMain.cpp
new file mode 100644
index 00000000000..3a4b9c07254
--- /dev/null
+++ b/llvm/lib/Fuzzer/FuzzerMain.cpp
@@ -0,0 +1,143 @@
+//===- FuzzerMain.cpp - main() function and flags -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// main() and flags.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerInternal.h"
+
+#include <climits>
+#include <cstring>
+#include <unistd.h>
+#include <iostream>
+
+// ASAN options:
+//   * don't dump the coverage to disk.
+extern "C" const char* __asan_default_options() { return "coverage_pcs=0"; }
+
+// Program arguments.
+struct FlagDescription {
+  const char *Name;
+  const char *Description;
+  int   Default;
+  int   *Flag;
+};
+
+struct {
+#define FUZZER_FLAG(Type, Name, Default, Description) Type Name;
+#include "FuzzerFlags.def"
+#undef FUZZER_FLAG
+} Flags;
+
+static FlagDescription FlagDescriptions [] {
+#define FUZZER_FLAG(Type, Name, Default, Description) {#Name, Description, Default, &Flags.Name},
+#include "FuzzerFlags.def"
+#undef FUZZER_FLAG
+};
+
+static const size_t kNumFlags =
+    sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
+
+static std::vector<std::string> inputs;
+static const char *ProgName;
+
+static void PrintHelp() {
+  std::cerr << "Usage: " << ProgName
+            << " [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n";
+  std::cerr << "\nFlags: (strictly in form -flag=value)\n";
+  size_t MaxFlagLen = 0;
+  for (size_t F = 0; F < kNumFlags; F++)
+    MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
+
+  for (size_t F = 0; F < kNumFlags; F++) {
+    const auto &D = FlagDescriptions[F];
+    std::cerr << "  " << D.Name;
+    for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
+      std::cerr << " ";
+    std::cerr << "\t";
+    std::cerr << D.Default << "\t" << D.Description << "\n";
+  }
+}
+
+static const char *FlagValue(const char *Param, const char *Name) {
+  size_t Len = strlen(Name);
+  if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
+      Param[Len + 1] == '=')
+      return &Param[Len + 2];
+  return nullptr;
+}
+
+static bool ParseOneFlag(const char *Param) {
+  if (Param[0] != '-') return false;
+  for (size_t F = 0; F < kNumFlags; F++) {
+    const char *Name = FlagDescriptions[F].Name;
+    const char *Str = FlagValue(Param, Name);
+    if (Str)  {
+      int Val = std::stol(Str);
+      *FlagDescriptions[F].Flag = Val;
+      if (Flags.verbosity >= 2)
+        std::cerr << "Flag: " << Name << " " << Val << "\n";
+      return true;
+    }
+  }
+  PrintHelp();
+  exit(1);
+}
+
+// We don't use any library to minimize dependencies.
+static void ParseFlags(int argc, char **argv) {
+  for (size_t F = 0; F < kNumFlags; F++)
+    *FlagDescriptions[F].Flag = FlagDescriptions[F].Default;
+  for (int A = 1; A < argc; A++) {
+    if (ParseOneFlag(argv[A])) continue;
+    inputs.push_back(argv[A]);
+  }
+}
+
+int main(int argc, char **argv) {
+  using namespace fuzzer;
+
+  ProgName = argv[0];
+  ParseFlags(argc, argv);
+  if (Flags.help) {
+    PrintHelp();
+    return 0;
+  }
+  Fuzzer::FuzzingOptions Options;
+  Options.Verbosity = Flags.verbosity;
+  Options.MaxLen = Flags.max_len;
+  Options.DoCrossOver = Flags.cross_over;
+  Options.MutateDepth = Flags.mutate_depth;
+  Options.ExitOnFirst = Flags.exit_on_first;
+  if (!inputs.empty())
+    Options.OutputCorpus = inputs[0];
+  Fuzzer F(Options);
+
+  unsigned seed = Flags.seed;
+  // Initialize seed.
+  if (seed == 0)
+    seed = time(0) * 10000 + getpid();
+  if (Flags.verbosity)
+    std::cerr << "Seed: " << seed << "\n";
+  srand(seed);
+
+  // Timer
+  if (Flags.timeout > 0)
+    SetTimer(Flags.timeout);
+
+  for (auto &inp : inputs)
+    F.ReadDir(inp);
+
+  if (F.CorpusSize() == 0)
+    F.AddToCorpus(Unit());  // Can't fuzz empty corpus, so add an empty input.
+  F.ShuffleAndMinimize();
+  F.Loop(Flags.iterations < 0 ? INT_MAX : Flags.iterations);
+  if (Flags.verbosity)
+    std::cerr << "Done\n";
+  return 1;
+}