From 0001c18d8c75b1265fc5adb105b77fad7581e172 Mon Sep 17 00:00:00 2001
From: Kostya Serebryany <kcc@google.com>
Date: Thu, 10 Sep 2015 16:57:57 +0000
Subject: [PATCH] [libFuzzer] add two more variants of FuzzerDriver for
 convenience

llvm-svn: 247300
---
 lib/Fuzzer/FuzzerDriver.cpp  | 53 ++++++++++++++++++++++--------------
 lib/Fuzzer/FuzzerInterface.h |  6 ++++
 2 files changed, 39 insertions(+), 20 deletions(-)

diff --git a/lib/Fuzzer/FuzzerDriver.cpp b/lib/Fuzzer/FuzzerDriver.cpp
index 55d1632a9a7..e79c21e8bdb 100644
--- a/lib/Fuzzer/FuzzerDriver.cpp
+++ b/lib/Fuzzer/FuzzerDriver.cpp
@@ -55,12 +55,12 @@ static FlagDescription FlagDescriptions [] {
 static const size_t kNumFlags =
     sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
 
-static std::vector<std::string> inputs;
-static const char *ProgName;
+static std::vector<std::string> *Inputs;
+static std::string *ProgName;
 
 static void PrintHelp() {
   Printf("Usage: %s [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n",
-         ProgName);
+         ProgName->c_str());
   Printf("\nFlags: (strictly in form -flag=value)\n");
   size_t MaxFlagLen = 0;
   for (size_t F = 0; F < kNumFlags; F++)
@@ -119,16 +119,17 @@ static bool ParseOneFlag(const char *Param) {
 }
 
 // We don't use any library to minimize dependencies.
-static void ParseFlags(int argc, char **argv) {
+static void ParseFlags(const std::vector<std::string> &Args) {
   for (size_t F = 0; F < kNumFlags; F++) {
     if (FlagDescriptions[F].IntFlag)
       *FlagDescriptions[F].IntFlag = FlagDescriptions[F].Default;
     if (FlagDescriptions[F].StrFlag)
       *FlagDescriptions[F].StrFlag = nullptr;
   }
-  for (int A = 1; A < argc; A++) {
-    if (ParseOneFlag(argv[A])) continue;
-    inputs.push_back(argv[A]);
+  Inputs = new std::vector<std::string>;
+  for (size_t A = 1; A < Args.size(); A++) {
+    if (ParseOneFlag(Args[A].c_str())) continue;
+    Inputs->push_back(Args[A]);
   }
 }
 
@@ -161,15 +162,15 @@ static void WorkerThread(const std::string &Cmd, std::atomic<int> *Counter,
   }
 }
 
-static int RunInMultipleProcesses(int argc, char **argv, int NumWorkers,
-                                  int NumJobs) {
+static int RunInMultipleProcesses(const std::vector<std::string> &Args,
+                                  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 += " ";
+  for (auto &S : Args) {
+    if (FlagValue(S.c_str(), "jobs") || FlagValue(S.c_str(), "workers"))
+      continue;
+    Cmd += S + " ";
   }
   std::vector<std::thread> V;
   std::thread Pulse(PulseThread);
@@ -208,10 +209,22 @@ int FuzzerDriver(int argc, char **argv, UserCallback Callback) {
 }
 
 int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF) {
-  using namespace fuzzer;
+  std::vector<std::string> Args(argv, argv + argc);
+  return FuzzerDriver(Args, USF);
+}
 
-  ProgName = argv[0];
-  ParseFlags(argc, argv);
+int FuzzerDriver(const std::vector<std::string> &Args, UserCallback Callback) {
+  FuzzerRandomLibc Rand(0);
+  SimpleUserSuppliedFuzzer SUSF(&Rand, Callback);
+  return FuzzerDriver(Args, SUSF);
+}
+
+int FuzzerDriver(const std::vector<std::string> &Args,
+                 UserSuppliedFuzzer &USF) {
+  using namespace fuzzer;
+  assert(!Args.empty());
+  ProgName = new std::string(Args[0]);
+  ParseFlags(Args);
   if (Flags.help) {
     PrintHelp();
     return 0;
@@ -224,7 +237,7 @@ int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF) {
   }
 
   if (Flags.workers > 0 && Flags.jobs > 0)
-    return RunInMultipleProcesses(argc, argv, Flags.workers, Flags.jobs);
+    return RunInMultipleProcesses(Args, Flags.workers, Flags.jobs);
 
   Fuzzer::FuzzingOptions Options;
   Options.Verbosity = Flags.verbosity;
@@ -245,8 +258,8 @@ int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF) {
   Options.TBMWidth = Flags.tbm_width;
   if (Flags.runs >= 0)
     Options.MaxNumberOfRuns = Flags.runs;
-  if (!inputs.empty())
-    Options.OutputCorpus = inputs[0];
+  if (!Inputs->empty())
+    Options.OutputCorpus = (*Inputs)[0];
   if (Flags.sync_command)
     Options.SyncCommand = Flags.sync_command;
   Options.SyncTimeout = Flags.sync_timeout;
@@ -282,7 +295,7 @@ int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF) {
   }
 
   F.RereadOutputCorpus();
-  for (auto &inp : inputs)
+  for (auto &inp : *Inputs)
     if (inp != Options.OutputCorpus)
       F.ReadDir(inp, nullptr);
 
diff --git a/lib/Fuzzer/FuzzerInterface.h b/lib/Fuzzer/FuzzerInterface.h
index d5af308be76..7f7d608800d 100644
--- a/lib/Fuzzer/FuzzerInterface.h
+++ b/lib/Fuzzer/FuzzerInterface.h
@@ -18,6 +18,8 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <vector>
+#include <string>
 
 namespace fuzzer {
 
@@ -162,6 +164,10 @@ class UserSuppliedFuzzer {
 /// Runs the fuzzing with the UserSuppliedFuzzer.
 int FuzzerDriver(int argc, char **argv, UserSuppliedFuzzer &USF);
 
+/// More C++-ish interface.
+int FuzzerDriver(const std::vector<std::string> &Args, UserSuppliedFuzzer &USF);
+int FuzzerDriver(const std::vector<std::string> &Args, UserCallback Callback);
+
 }  // namespace fuzzer
 
 #endif  // LLVM_FUZZER_INTERFACE_H