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diff --git a/lib/Target/X86/X86COFF.h b/lib/Target/X86/X86COFF.h
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index 000000000000..0a8e4e6ac6db
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+++ b/lib/Target/X86/X86COFF.h
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+//===--- X86COFF.h - Some definitions from COFF documentations ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file just defines some symbols found in COFF documentation. They are
+// used to emit function type information for COFF targets (Cygwin/Mingw32).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef X86COFF_H
+#define X86COFF_H
+
+namespace COFF 
+{
+/// Storage class tells where and what the symbol represents
+enum StorageClass {
+  C_EFCN =   -1,  ///< Physical end of function
+  C_NULL    = 0,  ///< No symbol
+  C_AUTO    = 1,  ///< External definition
+  C_EXT     = 2,  ///< External symbol
+  C_STAT    = 3,  ///< Static
+  C_REG     = 4,  ///< Register variable
+  C_EXTDEF  = 5,  ///< External definition
+  C_LABEL   = 6,  ///< Label
+  C_ULABEL  = 7,  ///< Undefined label
+  C_MOS     = 8,  ///< Member of structure
+  C_ARG     = 9,  ///< Function argument
+  C_STRTAG  = 10, ///< Structure tag
+  C_MOU     = 11, ///< Member of union
+  C_UNTAG   = 12, ///< Union tag
+  C_TPDEF   = 13, ///< Type definition
+  C_USTATIC = 14, ///< Undefined static
+  C_ENTAG   = 15, ///< Enumeration tag
+  C_MOE     = 16, ///< Member of enumeration
+  C_REGPARM = 17, ///< Register parameter
+  C_FIELD   = 18, ///< Bit field
+
+  C_BLOCK  = 100, ///< ".bb" or ".eb" - beginning or end of block
+  C_FCN    = 101, ///< ".bf" or ".ef" - beginning or end of function
+  C_EOS    = 102, ///< End of structure
+  C_FILE   = 103, ///< File name
+  C_LINE   = 104, ///< Line number, reformatted as symbol
+  C_ALIAS  = 105, ///< Duplicate tag
+  C_HIDDEN = 106  ///< External symbol in dmert public lib
+};
+
+/// The type of the symbol. This is made up of a base type and a derived type.
+/// For example, pointer to int is "pointer to T" and "int"
+enum SymbolType {
+  T_NULL   = 0,  ///< No type info
+  T_ARG    = 1,  ///< Void function argument (only used by compiler)
+  T_VOID   = 1,  ///< The same as above. Just named differently in some specs.
+  T_CHAR   = 2,  ///< Character
+  T_SHORT  = 3,  ///< Short integer
+  T_INT    = 4,  ///< Integer
+  T_LONG   = 5,  ///< Long integer
+  T_FLOAT  = 6,  ///< Floating point
+  T_DOUBLE = 7,  ///< Double word
+  T_STRUCT = 8,  ///< Structure
+  T_UNION  = 9,  ///< Union
+  T_ENUM   = 10, ///< Enumeration
+  T_MOE    = 11, ///< Member of enumeration
+  T_UCHAR  = 12, ///< Unsigned character
+  T_USHORT = 13, ///< Unsigned short
+  T_UINT   = 14, ///< Unsigned integer
+  T_ULONG  = 15  ///< Unsigned long
+};
+
+/// Derived type of symbol
+enum SymbolDerivedType {
+  DT_NON = 0, ///< No derived type
+  DT_PTR = 1, ///< Pointer to T
+  DT_FCN = 2, ///< Function returning T
+  DT_ARY = 3  ///< Array of T
+};
+
+/// Masks for extracting parts of type
+enum SymbolTypeMasks {
+  N_BTMASK = 017, ///< Mask for base type
+  N_TMASK  = 060  ///< Mask for derived type
+};
+
+/// Offsets of parts of type
+enum Shifts {
+  N_BTSHFT = 4 ///< Type is formed as (base + derived << N_BTSHIFT)
+};
+
+}
+
+#endif // X86COFF_H