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diff --git a/contrib/llvm/tools/llvm-cov/CoverageExporterJson.h b/contrib/llvm/tools/llvm-cov/CoverageExporterJson.h
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+//===- CoverageExporterJson.h - Code coverage JSON exporter ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class implements a code coverage exporter for JSON format.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_COV_COVERAGEEXPORTERJSON_H
+#define LLVM_COV_COVERAGEEXPORTERJSON_H
+
+#include "CoverageExporter.h"
+#include <stack>
+
+namespace llvm {
+
+class CoverageExporterJson : public CoverageExporter {
+  /// States that the JSON rendering machine can be in.
+  enum JsonState { None, NonEmptyElement, EmptyElement };
+
+  /// Tracks state of the JSON output.
+  std::stack<JsonState> State;
+
+  /// Emit a serialized scalar.
+  void emitSerialized(const int64_t Value);
+
+  /// Emit a serialized string.
+  void emitSerialized(const std::string &Value);
+
+  /// Emit a comma if there is a previous element to delimit.
+  void emitComma();
+
+  /// Emit a starting dictionary/object character.
+  void emitDictStart();
+
+  /// Emit a dictionary/object key but no value.
+  void emitDictKey(const std::string &Key);
+
+  /// Emit a dictionary/object key/value pair.
+  template <typename V>
+  void emitDictElement(const std::string &Key, const V &Value) {
+    emitComma();
+    emitSerialized(Key);
+    OS << ":";
+    emitSerialized(Value);
+  }
+
+  /// Emit a closing dictionary/object character.
+  void emitDictEnd();
+
+  /// Emit a starting array character.
+  void emitArrayStart();
+
+  /// Emit an array element.
+  template <typename V> void emitArrayElement(const V &Value) {
+    emitComma();
+    emitSerialized(Value);
+  }
+
+  /// emit a closing array character.
+  void emitArrayEnd();
+
+  /// Render an array of all the given functions.
+  void renderFunctions(
+      const iterator_range<coverage::FunctionRecordIterator> &Functions);
+
+  /// Render an array of all the source files, also pass back a Summary.
+  void renderFiles(ArrayRef<std::string> SourceFiles,
+                   ArrayRef<FileCoverageSummary> FileReports);
+
+  /// Render a single file.
+  void renderFile(const std::string &Filename,
+                  const FileCoverageSummary &FileReport);
+
+  /// Render summary for a single file.
+  void renderFileCoverage(const coverage::CoverageData &FileCoverage,
+                          const FileCoverageSummary &FileReport);
+
+  /// Render a CoverageSegment.
+  void renderSegment(const coverage::CoverageSegment &Segment);
+
+  /// Render an ExpansionRecord.
+  void renderExpansion(const coverage::ExpansionRecord &Expansion);
+
+  /// Render a list of CountedRegions.
+  void renderRegions(ArrayRef<coverage::CountedRegion> Regions);
+
+  /// Render a single CountedRegion.
+  void renderRegion(const coverage::CountedRegion &Region);
+
+  /// Render a FileCoverageSummary.
+  void renderSummary(const FileCoverageSummary &Summary);
+
+public:
+  CoverageExporterJson(const coverage::CoverageMapping &CoverageMapping,
+                       const CoverageViewOptions &Options, raw_ostream &OS);
+
+  /// Render the CoverageMapping object.
+  void renderRoot(const CoverageFilters &IgnoreFilenameFilters) override;
+
+  /// Render the CoverageMapping object for specified source files.
+  void renderRoot(const std::vector<std::string> &SourceFiles) override;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_COV_COVERAGEEXPORTERJSON_H