[llvm-opt-fuzzer] Introduce llvm-opt-fuzzer for fuzzing optimization passes

This change adds generic fuzzing tools capable of running libFuzzer tests on
any optimization pass or combination of them.

Differential Revision: https://reviews.llvm.org/D39555

llvm-svn: 317883

1 files changed, 21 insertions, 0 deletions

diff --git a/llvm/tools/llvm-opt-fuzzer/DummyOptFuzzer.cpp b/llvm/tools/llvm-opt-fuzzer/DummyOptFuzzer.cpp
new file mode 100644
index 00000000000..115923fe33c
--- /dev/null
+++ b/llvm/tools/llvm-opt-fuzzer/DummyOptFuzzer.cpp
@@ -0,0 +1,21 @@
+//===--- DummyOptFuzzer.cpp - Entry point to sanity check the fuzzer ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of main so we can build and test without linking libFuzzer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/FuzzMutate/FuzzerCLI.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv);
+int main(int argc, char *argv[]) {
+    return llvm::runFuzzerOnInputs(argc, argv, LLVMFuzzerTestOneInput,
+                                   LLVMFuzzerInitialize);
+}