+//===- FuzzerDriver.cpp - FuzzerDriver function and flags -----------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// FuzzerDriver and flag parsing.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerInterface.h"
+#include "FuzzerInternal.h"
+
+#include <cstring>
+#include <unistd.h>
+#include <iostream>
+#include <thread>
+#include <atomic>
+#include <mutex>
+
+namespace fuzzer {
+
+// 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]);
+ }
+}
+
+static void WorkerThread(const std::string &Cmd, std::atomic<int> *Counter,
+ int NumJobs, std::atomic<bool> *HasErrors) {
+ static std::mutex CerrMutex;
+ while (true) {
+ int C = (*Counter)++;
+ if (C >= NumJobs) break;
+ std::string Log = "fuzz-" + std::to_string(C) + ".log";
+ std::string ToRun = Cmd + " > " + Log + " 2>&1\n";
+ if (Flags.verbosity)
+ std::cerr << ToRun;
+ int ExitCode = system(ToRun.c_str());
+ if (ExitCode != 0)
+ *HasErrors = true;
+ std::lock_guard<std::mutex> Lock(CerrMutex);
+ std::cerr << "================== Job " << C
+ << " exited with exit code " << ExitCode
+ << " =================\n";
+ fuzzer::CopyFileToErr(Log);
+ }
+}
+
+static int RunInMultipleProcesses(int argc, char **argv, int NumWorkers,
+ int NumJobs) {
+ std::atomic<int> Counter(0);
+ std::atomic<bool> HasErrors(false);
+ std::string Cmd;
+ for (int i = 0; i < argc; i++) {
+ if (FlagValue(argv[i], "jobs") || FlagValue(argv[i], "workers")) continue;
+ Cmd += argv[i];
+ Cmd += " ";
+ }
+ std::vector<std::thread> V;
+ for (int i = 0; i < NumWorkers; i++)
+ V.push_back(std::thread(WorkerThread, Cmd, &Counter, NumJobs, &HasErrors));
+ for (auto &T : V)
+ T.join();
+ return HasErrors ? 1 : 0;
+}
+
+int FuzzerDriver(int argc, char **argv, UserCallback Callback) {
+ using namespace fuzzer;
+
+ ProgName = argv[0];
+ ParseFlags(argc, argv);
+ if (Flags.help) {
+ PrintHelp();
+ return 0;
+ }
+
+ if (Flags.workers > 0 && Flags.jobs > 0)
+ return RunInMultipleProcesses(argc, argv, Flags.workers, Flags.jobs);
+
+ 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;
+ Options.UseFullCoverageSet = Flags.use_full_coverage_set;
+ Options.PreferSmallDuringInitialShuffle =
+ Flags.prefer_small_during_initial_shuffle;
+ if (Flags.runs >= 0)
+ Options.MaxNumberOfRuns = Flags.runs;
+ if (!inputs.empty())
+ Options.OutputCorpus = inputs[0];
+ Fuzzer F(Callback, 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();
+ if (Flags.save_minimized_corpus)
+ F.SaveCorpus();
+ F.Loop(Flags.iterations < 0 ? INT_MAX : Flags.iterations);
+ if (Flags.verbosity)
+ std::cerr << "Done " << F.getTotalNumberOfRuns()
+ << " runs in " << F.secondsSinceProcessStartUp()
+ << " seconds\n";
+ return 0;
+}
+
+} // namespace fuzzer
projects / oota-llvm.git / commitdiff