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diff --git a/include/llvm/DebugInfo/DWARFDebugLine.h b/include/llvm/DebugInfo/DWARFDebugLine.h
new file mode 100644
index 000000000000..c5ee76e39682
--- /dev/null
+++ b/include/llvm/DebugInfo/DWARFDebugLine.h
@@ -0,0 +1,238 @@
+//===-- DWARFDebugLine.h ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_DEBUGINFO_DWARFDEBUGLINE_H
+#define LLVM_LIB_DEBUGINFO_DWARFDEBUGLINE_H
+
+#include "llvm/DebugInfo/DIContext.h"
+#include "llvm/DebugInfo/DWARFRelocMap.h"
+#include "llvm/Support/DataExtractor.h"
+#include <map>
+#include <string>
+#include <vector>
+
+namespace llvm {
+
+class raw_ostream;
+
+class DWARFDebugLine {
+public:
+  DWARFDebugLine(const RelocAddrMap* LineInfoRelocMap) : RelocMap(LineInfoRelocMap) {}
+  struct FileNameEntry {
+    FileNameEntry() : Name(nullptr), DirIdx(0), ModTime(0), Length(0) {}
+
+    const char *Name;
+    uint64_t DirIdx;
+    uint64_t ModTime;
+    uint64_t Length;
+  };
+
+  struct Prologue {
+    Prologue();
+
+    // The size in bytes of the statement information for this compilation unit
+    // (not including the total_length field itself).
+    uint32_t TotalLength;
+    // Version identifier for the statement information format.
+    uint16_t Version;
+    // The number of bytes following the prologue_length field to the beginning
+    // of the first byte of the statement program itself.
+    uint32_t PrologueLength;
+    // The size in bytes of the smallest target machine instruction. Statement
+    // program opcodes that alter the address register first multiply their
+    // operands by this value.
+    uint8_t MinInstLength;
+    // The maximum number of individual operations that may be encoded in an
+    // instruction.
+    uint8_t MaxOpsPerInst;
+    // The initial value of theis_stmtregister.
+    uint8_t DefaultIsStmt;
+    // This parameter affects the meaning of the special opcodes. See below.
+    int8_t LineBase;
+    // This parameter affects the meaning of the special opcodes. See below.
+    uint8_t LineRange;
+    // The number assigned to the first special opcode.
+    uint8_t OpcodeBase;
+    std::vector<uint8_t> StandardOpcodeLengths;
+    std::vector<const char*> IncludeDirectories;
+    std::vector<FileNameEntry> FileNames;
+
+    // Length of the prologue in bytes.
+    uint32_t getLength() const {
+      return PrologueLength + sizeof(TotalLength) + sizeof(Version) +
+             sizeof(PrologueLength);
+    }
+    // Length of the line table data in bytes (not including the prologue).
+    uint32_t getStatementTableLength() const {
+      return TotalLength + sizeof(TotalLength) - getLength();
+    }
+    int32_t getMaxLineIncrementForSpecialOpcode() const {
+      return LineBase + (int8_t)LineRange - 1;
+    }
+
+    void clear();
+    void dump(raw_ostream &OS) const;
+    bool parse(DataExtractor debug_line_data, uint32_t *offset_ptr);
+  };
+
+  // Standard .debug_line state machine structure.
+  struct Row {
+    explicit Row(bool default_is_stmt = false);
+
+    /// Called after a row is appended to the matrix.
+    void postAppend();
+    void reset(bool default_is_stmt);
+    void dump(raw_ostream &OS) const;
+
+    static bool orderByAddress(const Row& LHS, const Row& RHS) {
+      return LHS.Address < RHS.Address;
+    }
+
+    // The program-counter value corresponding to a machine instruction
+    // generated by the compiler.
+    uint64_t Address;
+    // An unsigned integer indicating a source line number. Lines are numbered
+    // beginning at 1. The compiler may emit the value 0 in cases where an
+    // instruction cannot be attributed to any source line.
+    uint32_t Line;
+    // An unsigned integer indicating a column number within a source line.
+    // Columns are numbered beginning at 1. The value 0 is reserved to indicate
+    // that a statement begins at the 'left edge' of the line.
+    uint16_t Column;
+    // An unsigned integer indicating the identity of the source file
+    // corresponding to a machine instruction.
+    uint16_t File;
+    // An unsigned integer whose value encodes the applicable instruction set
+    // architecture for the current instruction.
+    uint8_t Isa;
+    // An unsigned integer representing the DWARF path discriminator value
+    // for this location.
+    uint32_t Discriminator;
+    // A boolean indicating that the current instruction is the beginning of a
+    // statement.
+    uint8_t IsStmt:1,
+            // A boolean indicating that the current instruction is the
+            // beginning of a basic block.
+            BasicBlock:1,
+            // A boolean indicating that the current address is that of the
+            // first byte after the end of a sequence of target machine
+            // instructions.
+            EndSequence:1,
+            // A boolean indicating that the current address is one (of possibly
+            // many) where execution should be suspended for an entry breakpoint
+            // of a function.
+            PrologueEnd:1,
+            // A boolean indicating that the current address is one (of possibly
+            // many) where execution should be suspended for an exit breakpoint
+            // of a function.
+            EpilogueBegin:1;
+  };
+
+  // Represents a series of contiguous machine instructions. Line table for each
+  // compilation unit may consist of multiple sequences, which are not
+  // guaranteed to be in the order of ascending instruction address.
+  struct Sequence {
+    // Sequence describes instructions at address range [LowPC, HighPC)
+    // and is described by line table rows [FirstRowIndex, LastRowIndex).
+    uint64_t LowPC;
+    uint64_t HighPC;
+    unsigned FirstRowIndex;
+    unsigned LastRowIndex;
+    bool Empty;
+
+    Sequence();
+    void reset();
+
+    static bool orderByLowPC(const Sequence& LHS, const Sequence& RHS) {
+      return LHS.LowPC < RHS.LowPC;
+    }
+    bool isValid() const {
+      return !Empty && (LowPC < HighPC) && (FirstRowIndex < LastRowIndex);
+    }
+    bool containsPC(uint64_t pc) const {
+      return (LowPC <= pc && pc < HighPC);
+    }
+  };
+
+  struct LineTable {
+    LineTable();
+
+    void appendRow(const DWARFDebugLine::Row &R) {
+      Rows.push_back(R);
+    }
+    void appendSequence(const DWARFDebugLine::Sequence &S) {
+      Sequences.push_back(S);
+    }
+
+    // Returns the index of the row with file/line info for a given address,
+    // or -1 if there is no such row.
+    uint32_t lookupAddress(uint64_t address) const;
+
+    bool lookupAddressRange(uint64_t address, uint64_t size,
+                            std::vector<uint32_t> &result) const;
+
+    // Extracts filename by its index in filename table in prologue.
+    // Returns true on success.
+    bool getFileNameByIndex(uint64_t FileIndex, const char *CompDir,
+                            DILineInfoSpecifier::FileLineInfoKind Kind,
+                            std::string &Result) const;
+
+    // Fills the Result argument with the file and line information
+    // corresponding to Address. Returns true on success.
+    bool getFileLineInfoForAddress(uint64_t Address, const char *CompDir, 
+                                   DILineInfoSpecifier::FileLineInfoKind Kind,
+                                   DILineInfo &Result) const;
+
+    void dump(raw_ostream &OS) const;
+    void clear();
+
+    /// Parse prologue and all rows.
+    bool parse(DataExtractor debug_line_data, const RelocAddrMap *RMap,
+               uint32_t *offset_ptr);
+
+    struct Prologue Prologue;
+    typedef std::vector<Row> RowVector;
+    typedef RowVector::const_iterator RowIter;
+    typedef std::vector<Sequence> SequenceVector;
+    typedef SequenceVector::const_iterator SequenceIter;
+    RowVector Rows;
+    SequenceVector Sequences;
+  };
+
+  const LineTable *getLineTable(uint32_t offset) const;
+  const LineTable *getOrParseLineTable(DataExtractor debug_line_data,
+                                       uint32_t offset);
+
+private:
+  struct ParsingState {
+    ParsingState(struct LineTable *LT);
+
+    void resetRowAndSequence();
+    void appendRowToMatrix(uint32_t offset);
+
+    // Line table we're currently parsing.
+    struct LineTable *LineTable;
+    // The row number that starts at zero for the prologue, and increases for
+    // each row added to the matrix.
+    unsigned RowNumber;
+    struct Row Row;
+    struct Sequence Sequence;
+  };
+
+  typedef std::map<uint32_t, LineTable> LineTableMapTy;
+  typedef LineTableMapTy::iterator LineTableIter;
+  typedef LineTableMapTy::const_iterator LineTableConstIter;
+
+  const RelocAddrMap *RelocMap;
+  LineTableMapTy LineTableMap;
+};
+
+}
+
+#endif