[libFuzzer] don't require seed in fuzzer::Mutate, instead use the global Fuzzer object for fuzzer::Mutate. This makes custom mutators fast

llvm-svn: 260810

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Fuzzer/FuzzerLoop.cpp b/llvm/lib/Fuzzer/FuzzerLoop.cpp
index 1c2c369..ca96438 100644
--- a/llvm/lib/Fuzzer/FuzzerLoop.cpp
+++ b/llvm/lib/Fuzzer/FuzzerLoop.cpp
@@ -60,6 +60,11 @@ static void MissingWeakApiFunction(const char *FnName) {
 // Only one Fuzzer per process.
 static Fuzzer *F;
 
+size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize) {
+  assert(F);
+  return F->GetMD().Mutate(Data, Size, MaxSize);
+}
+
 Fuzzer::Fuzzer(UserCallback CB, MutationDispatcher &MD, FuzzingOptions Options)
     : CB(CB), MD(MD), Options(Options) {
   SetDeathCallback();