Revert r363326 "[libFuzzer] simplify the DFT trace collection using the new faster DFSan mode that traces up to 16 labels at a time and never runs out of labels."

It broke the Windows build:

C:\b\s\w\ir\cache\builder\src\third_party\llvm\compiler-rt\lib\fuzzer\FuzzerDataFlowTrace.cpp(243): error C3861: 'setenv': identifier not found

This also reverts the follow-up r363327.

llvm-svn: 363358

1 files changed, 9 insertions, 10 deletions

diff --git a/compiler-rt/lib/fuzzer/FuzzerFork.cpp b/compiler-rt/lib/fuzzer/FuzzerFork.cpp
index 5c4855f8284..870a2244850 100644
--- a/compiler-rt/lib/fuzzer/FuzzerFork.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerFork.cpp
@@ -89,7 +89,6 @@ struct GlobalEnv {
   std::string DFTDir;
   std::string DataFlowBinary;
   Set<uint32_t> Features, Cov;
-  Set<std::string> FilesWithDFT;
   Vector<std::string> Files;
   Random *Rand;
   std::chrono::system_clock::time_point ProcessStartTime;
@@ -127,13 +126,10 @@ struct GlobalEnv {
     auto Job = new FuzzJob;
     std::string Seeds;
     if (size_t CorpusSubsetSize =
-            std::min(Files.size(), (size_t)sqrt(Files.size() + 2))) {
-      for (size_t i = 0; i < CorpusSubsetSize; i++) {
-        auto &SF = Files[Rand->SkewTowardsLast(Files.size())];
-        Seeds += (Seeds.empty() ? "" : ",") + SF;
-        CollectDFT(SF);
-      }
-    }
+            std::min(Files.size(), (size_t)sqrt(Files.size() + 2)))
+      for (size_t i = 0; i < CorpusSubsetSize; i++)
+        Seeds += (Seeds.empty() ? "" : ",") +
+                 Files[Rand->SkewTowardsLast(Files.size())];
     if (!Seeds.empty()) {
       Job->SeedListPath =
           DirPlusFile(TempDir, std::to_string(JobId) + ".seeds");
@@ -200,6 +196,7 @@ struct GlobalEnv {
       auto NewPath = DirPlusFile(MainCorpusDir, Hash(U));
       WriteToFile(U, NewPath);
       Files.push_back(NewPath);
+      CollectDFT(NewPath);
     }
     Features.insert(NewFeatures.begin(), NewFeatures.end());
     Cov.insert(NewCov.begin(), NewCov.end());
@@ -220,7 +217,6 @@ struct GlobalEnv {
 
   void CollectDFT(const std::string &InputPath) {
     if (DataFlowBinary.empty()) return;
-    if (!FilesWithDFT.insert(InputPath).second) return;
     Command Cmd(Args);
     Cmd.removeFlag("fork");
     Cmd.removeFlag("runs");
@@ -230,7 +226,7 @@ struct GlobalEnv {
       Cmd.removeArgument(C);
     Cmd.setOutputFile(DirPlusFile(TempDir, "dft.log"));
     Cmd.combineOutAndErr();
-    // Printf("CollectDFT: %s\n", Cmd.toString().c_str());
+    // Printf("CollectDFT: %s %s\n", InputPath.c_str(), Cmd.toString().c_str());
     ExecuteCommand(Cmd);
   }
 
@@ -300,6 +296,9 @@ void FuzzWithFork(Random &Rand, const FuzzingOptions &Options,
   CrashResistantMerge(Env.Args, {}, SeedFiles, &Env.Files, {}, &Env.Features,
                       {}, &Env.Cov,
                       CFPath, false);
+  for (auto &F : Env.Files)
+    Env.CollectDFT(F);
+
   RemoveFile(CFPath);
   Printf("INFO: -fork=%d: %zd seed inputs, starting to fuzz in %s\n", NumJobs,
          Env.Files.size(), Env.TempDir.c_str());