--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lld/ELF/ScriptLexer.h	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,55 @@
+//===- ScriptLexer.h --------------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_ELF_SCRIPT_LEXER_H
+#define LLD_ELF_SCRIPT_LEXER_H
+
+#include "lld/Common/LLVM.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include <utility>
+#include <vector>
+
+namespace lld {
+namespace elf {
+
+class ScriptLexer {
+public:
+  explicit ScriptLexer(MemoryBufferRef mb);
+
+  void setError(const Twine &msg);
+  void tokenize(MemoryBufferRef mb);
+  static StringRef skipSpace(StringRef s);
+  bool atEOF();
+  StringRef next();
+  StringRef peek();
+  StringRef peek2();
+  void skip();
+  bool consume(StringRef tok);
+  void expect(StringRef expect);
+  bool consumeLabel(StringRef tok);
+  std::string getCurrentLocation();
+
+  std::vector<MemoryBufferRef> mbs;
+  std::vector<StringRef> tokens;
+  bool inExpr = false;
+  size_t pos = 0;
+
+private:
+  void maybeSplitExpr();
+  StringRef getLine();
+  size_t getLineNumber();
+  size_t getColumnNumber();
+
+  MemoryBufferRef getCurrentMB();
+};
+
+} // namespace elf
+} // namespace lld
+
+#endif