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diff --git a/include/llvm/MC/MCDwarf.h b/include/llvm/MC/MCDwarf.h
new file mode 100644
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+++ b/include/llvm/MC/MCDwarf.h
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+//===- MCDwarf.h - Machine Code Dwarf support -------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the MCDwarfFile to support the dwarf
+// .file directive.
+// TODO: add the support needed for the .loc directive.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCDWARF_H
+#define LLVM_MC_MCDWARF_H
+
+#include "llvm/ADT/StringRef.h"
+#include <vector>
+
+namespace llvm {
+  class MCContext;
+  class MCSection;
+  class MCSymbol;
+  class raw_ostream;
+
+  /// MCDwarfFile - Instances of this class represent the name of the dwarf
+  /// .file directive and its associated dwarf file number in the MC file,
+  /// and MCDwarfFile's are created and unique'd by the MCContext class where
+  /// the file number for each is its index into the vector of DwarfFiles (note
+  /// index 0 is not used and not a valid dwarf file number).
+  class MCDwarfFile {
+    // Name - the base name of the file without its directory path.
+    // The StringRef references memory allocated in the MCContext.
+    StringRef Name;
+
+    // DirIndex - the index into the list of directory names for this file name.
+    unsigned DirIndex;
+
+  private:  // MCContext creates and uniques these.
+    friend class MCContext;
+    MCDwarfFile(StringRef name, unsigned dirIndex)
+      : Name(name), DirIndex(dirIndex) {}
+
+    MCDwarfFile(const MCDwarfFile&);       // DO NOT IMPLEMENT
+    void operator=(const MCDwarfFile&); // DO NOT IMPLEMENT
+  public:
+    /// getName - Get the base name of this MCDwarfFile.
+    StringRef getName() const { return Name; }
+
+    /// getDirIndex - Get the dirIndex of this MCDwarfFile.
+    unsigned getDirIndex() const { return DirIndex; }
+
+
+    /// print - Print the value to the stream \arg OS.
+    void print(raw_ostream &OS) const;
+
+    /// dump - Print the value to stderr.
+    void dump() const;
+  };
+
+  inline raw_ostream &operator<<(raw_ostream &OS, const MCDwarfFile &DwarfFile){
+    DwarfFile.print(OS);
+    return OS;
+  }
+
+  /// MCDwarfLoc - Instances of this class represent the information from a
+  /// dwarf .loc directive.
+  class MCDwarfLoc {
+    // FileNum - the file number.
+    unsigned FileNum;
+    // Line - the line number.
+    unsigned Line;
+    // Column - the column position.
+    unsigned Column;
+    // Flags (see #define's below)
+    unsigned Flags;
+    // Isa
+    unsigned Isa;
+
+#define DWARF2_FLAG_IS_STMT        (1 << 0)
+#define DWARF2_FLAG_BASIC_BLOCK    (1 << 1)
+#define DWARF2_FLAG_PROLOGUE_END   (1 << 2)
+#define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3)
+
+  private:  // MCContext manages these
+    friend class MCContext;
+    friend class MCLineEntry;
+    MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags,
+               unsigned isa)
+      : FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa) {}
+
+    // Allow the default copy constructor and assignment operator to be used
+    // for an MCDwarfLoc object.
+
+  public:
+    /// setFileNum - Set the FileNum of this MCDwarfLoc.
+    void setFileNum(unsigned fileNum) { FileNum = fileNum; }
+
+    /// setLine - Set the Line of this MCDwarfLoc.
+    void setLine(unsigned line) { Line = line; }
+
+    /// setColumn - Set the Column of this MCDwarfLoc.
+    void setColumn(unsigned column) { Column = column; }
+
+    /// setFlags - Set the Flags of this MCDwarfLoc.
+    void setFlags(unsigned flags) { Flags = flags; }
+
+    /// setIsa - Set the Isa of this MCDwarfLoc.
+    void setIsa(unsigned isa) { Isa = isa; }
+  };
+
+  /// MCLineEntry - Instances of this class represent the line information for
+  /// the dwarf line table entries.  Which is created after a machine
+  /// instruction is assembled and uses an address from a temporary label
+  /// created at the current address in the current section and the info from
+  /// the last .loc directive seen as stored in the context.
+  class MCLineEntry : public MCDwarfLoc {
+    MCSymbol *Label;
+
+  private:
+    // Allow the default copy constructor and assignment operator to be used
+    // for an MCLineEntry object.
+
+  public:
+    // Constructor to create an MCLineEntry given a symbol and the dwarf loc.
+    MCLineEntry(MCSymbol *label, const MCDwarfLoc loc) : MCDwarfLoc(loc),
+                Label(label) {}
+  };
+
+  /// MCLineSection - Instances of this class represent the line information
+  /// for a section where machine instructions have been assembled after seeing
+  /// .loc directives.  This is the information used to build the dwarf line
+  /// table for a section.
+  class MCLineSection {
+    std::vector<MCLineEntry> MCLineEntries;
+
+  private:
+    MCLineSection(const MCLineSection&);  // DO NOT IMPLEMENT
+    void operator=(const MCLineSection&); // DO NOT IMPLEMENT
+
+  public:
+    // Constructor to create an MCLineSection with an empty MCLineEntries
+    // vector.
+    MCLineSection() {}
+
+    // addLineEntry - adds an entry to this MCLineSection's line entries
+    void addLineEntry(const MCLineEntry &LineEntry) {
+      MCLineEntries.push_back(LineEntry);
+    }
+  };
+
+} // end namespace llvm
+
+#endif