[libFuzzer] make LLVMFuzzerTestOneInput (the fuzzer target function) return int instead of void. The actual return value is not *yet* used (and expected to be 0). This change is API breaking, so the fuzzers will need to be updated.

llvm-svn: 249214

1 files changed, 10 insertions, 3 deletions

diff --git a/llvm/lib/Fuzzer/FuzzerInternal.h b/llvm/lib/Fuzzer/FuzzerInternal.h
index 78e9c2208b6..3049167c62b 100644
--- a/llvm/lib/Fuzzer/FuzzerInternal.h
+++ b/llvm/lib/Fuzzer/FuzzerInternal.h
@@ -176,12 +176,19 @@ class SimpleUserSuppliedFuzzer: public UserSuppliedFuzzer {
  public:
   SimpleUserSuppliedFuzzer(FuzzerRandomBase *Rand, UserCallback Callback)
       : UserSuppliedFuzzer(Rand), Callback(Callback) {}
-  virtual void TargetFunction(const uint8_t *Data, size_t Size) {
-    return Callback(Data, Size);
+
+  SimpleUserSuppliedFuzzer(FuzzerRandomBase *Rand, DeprecatedUserCallback Callback)
+      : UserSuppliedFuzzer(Rand), DeprecatedCallback(Callback) {}
+
+  virtual int TargetFunction(const uint8_t *Data, size_t Size) override {
+    if (Callback) return Callback(Data, Size);
+    DeprecatedCallback(Data, Size);
+    return 0;
   }
 
  private:
-  UserCallback Callback;
+  DeprecatedUserCallback DeprecatedCallback = nullptr;
+  UserCallback Callback = nullptr;
 };
 
 };  // namespace fuzzer