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diff --git a/third_party/wasm2c/src/lexer-source-line-finder.h b/third_party/wasm2c/src/lexer-source-line-finder.h
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+/*
+ * Copyright 2017 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WABT_LEXER_SOURCE_LINE_FINDER_H_
+#define WABT_LEXER_SOURCE_LINE_FINDER_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "src/common.h"
+#include "src/lexer-source.h"
+#include "src/range.h"
+
+namespace wabt {
+
+class LexerSourceLineFinder {
+ public:
+  struct SourceLine {
+    std::string line;
+    int column_offset;
+  };
+
+  explicit LexerSourceLineFinder(std::unique_ptr<LexerSource>);
+
+  Result GetSourceLine(const Location& loc,
+                       Offset max_line_length,
+                       SourceLine* out_source_line);
+  Result GetLineOffsets(int line, OffsetRange* out_offsets);
+
+ private:
+  static OffsetRange ClampSourceLineOffsets(OffsetRange line_offset_range,
+                                            ColumnRange column_range,
+                                            Offset max_line_length);
+
+  bool IsLineCached(int line) const;
+  OffsetRange GetCachedLine(int line) const;
+
+  std::unique_ptr<LexerSource> source_;
+  std::vector<OffsetRange> line_ranges_;
+  Offset next_line_start_;
+  bool last_cr_;  // Last read character was a '\r' (carriage return).
+  bool eof_;
+};
+
+}  // namespace wabt
+
+#endif  // WABT_LEXER_SOURCE_LINE_FINDER_H_