1 files changed, 43 insertions, 0 deletions
diff --git a/clangd/fuzzer/clangd-fuzzer.cpp b/clangd/fuzzer/clangd-fuzzer.cpp
new file mode 100644
index 00000000..5e7de771
--- /dev/null
+++ b/clangd/fuzzer/clangd-fuzzer.cpp
@@ -0,0 +1,43 @@
+//===-- ClangdFuzzer.cpp - Fuzz clangd ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file implements a function that runs clangd on a single input.
+/// This function is then linked into the Fuzzer library.
+///
+//===----------------------------------------------------------------------===//
+
+#include "ClangdLSPServer.h"
+#include "ClangdServer.h"
+#include "CodeComplete.h"
+#include "FSProvider.h"
+#include <cstdio>
+#include <sstream>
+
+using namespace clang::clangd;
+
+extern "C" int LLVMFuzzerTestOneInput(uint8_t *data, size_t size) {
+  if (size == 0)
+    return 0;
+
+  // fmemopen isn't portable, but I think we only run the fuzzer on Linux.
+  std::FILE *In = fmemopen(data, size, "r");
+  auto Transport = newJSONTransport(In, llvm::nulls(),
+                                    /*InMirror=*/nullptr, /*Pretty=*/false,
+                                    /*Style=*/JSONStreamStyle::Delimited);
+  RealFileSystemProvider FS;
+  CodeCompleteOptions CCOpts;
+  CCOpts.EnableSnippets = false;
+  ClangdServer::Options Opts;
+
+  // Initialize and run ClangdLSPServer.
+  ClangdLSPServer LSPServer(*Transport, FS, CCOpts, llvm::None, false,
+                            llvm::None, Opts);
+  LSPServer.run();
+  return 0;
+}