2 files changed, 63 insertions, 0 deletions
diff --git a/tools/clang-fuzzer/CMakeLists.txt b/tools/clang-fuzzer/CMakeLists.txt
new file mode 100644
index 0000000000000..87d21c6bf116b
--- /dev/null
+++ b/tools/clang-fuzzer/CMakeLists.txt
@@ -0,0 +1,20 @@
+if( LLVM_USE_SANITIZE_COVERAGE )
+  set(LLVM_LINK_COMPONENTS support)
+
+  add_clang_executable(clang-fuzzer
+    EXCLUDE_FROM_ALL
+    ClangFuzzer.cpp
+    )
+
+  target_link_libraries(clang-fuzzer
+    ${CLANG_FORMAT_LIB_DEPS}
+    clangAST
+    clangBasic
+    clangDriver
+    clangFrontend
+    clangRewriteFrontend
+    clangStaticAnalyzerFrontend
+    clangTooling
+    LLVMFuzzer
+    )
+endif()
diff --git a/tools/clang-fuzzer/ClangFuzzer.cpp b/tools/clang-fuzzer/ClangFuzzer.cpp
new file mode 100644
index 0000000000000..17ef0521e3c38
--- /dev/null
+++ b/tools/clang-fuzzer/ClangFuzzer.cpp
@@ -0,0 +1,43 @@
+//===-- ClangFuzzer.cpp - Fuzz Clang --------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file implements a function that runs Clang on a single
+///  input. This function is then linked into the Fuzzer library.
+///
+//===----------------------------------------------------------------------===//
+
+#include "clang/Tooling/Tooling.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "llvm/Option/Option.h"
+
+using namespace clang;
+
+extern "C" void LLVMFuzzerTestOneInput(uint8_t *data, size_t size) {
+  std::string s((const char *)data, size);
+  llvm::opt::ArgStringList CC1Args;
+  CC1Args.push_back("-cc1");
+  CC1Args.push_back("./test.cc");
+  llvm::IntrusiveRefCntPtr<FileManager> Files(
+      new FileManager(FileSystemOptions()));
+  IgnoringDiagConsumer Diags;
+  IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
+  DiagnosticsEngine Diagnostics(
+      IntrusiveRefCntPtr<clang::DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
+      &Diags, false);
+  std::unique_ptr<clang::CompilerInvocation> Invocation(
+      tooling::newInvocation(&Diagnostics, CC1Args));
+  std::unique_ptr<llvm::MemoryBuffer> Input =
+      llvm::MemoryBuffer::getMemBuffer(s);
+  Invocation->getPreprocessorOpts().addRemappedFile("./test.cc", Input.release());
+  std::unique_ptr<tooling::ToolAction> action(
+      tooling::newFrontendActionFactory<clang::SyntaxOnlyAction>());
+  action->runInvocation(Invocation.release(), Files.get(), &Diags);
+}