It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

13 files changed, 1915 insertions, 0 deletions

diff --git a/include/llvm/System/Alarm.h b/include/llvm/System/Alarm.h
new file mode 100644
index 0000000..2b78da6
--- /dev/null
+++ b/include/llvm/System/Alarm.h
@@ -0,0 +1,49 @@
+//===- llvm/System/Alarm.h - Alarm Generation support  ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides an operating system independent interface to alarm(2) 
+// type functionality. The Alarm class allows a one-shot alarm to be set up 
+// at some number of seconds in the future. When the alarm triggers, a method
+// is called to process the event
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_ALARM_H
+#define LLVM_SYSTEM_ALARM_H
+
+#include "llvm/System/IncludeFile.h"
+
+namespace llvm {
+namespace sys {
+
+  /// This function registers an alarm to trigger some number of \p seconds in 
+  /// the future. When that time arrives, the AlarmStatus function will begin
+  /// to return 1 instead of 0. The user must poll the status of the alarm by
+  /// making occasional calls to AlarmStatus. If the user sends an interrupt
+  /// signal, AlarmStatus will begin returning -1, even if the alarm event
+  /// occurred.
+  /// @returns nothing
+  void SetupAlarm(
+    unsigned seconds ///< Number of seconds in future when alarm arrives
+  );
+
+  /// This function terminates the alarm previously set up 
+  /// @returns nothing
+  void TerminateAlarm();
+
+  /// This function acquires the status of the alarm. 
+  /// @returns -1=cancelled, 0=untriggered, 1=triggered
+  int AlarmStatus();
+
+} // End sys namespace
+} // End llvm namespace
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemAlarm)
+
+#endif
diff --git a/include/llvm/System/Disassembler.h b/include/llvm/System/Disassembler.h
new file mode 100644
index 0000000..fd08f2d
--- /dev/null
+++ b/include/llvm/System/Disassembler.h
@@ -0,0 +1,35 @@
+//===- llvm/Support/Disassembler.h ------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Anton Korobeynikov and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the necessary glue to call external disassembler
+// libraries.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_DISASSEMBLER_H
+#define LLVM_SYSTEM_DISASSEMBLER_H
+
+#include "llvm/Support/DataTypes.h"
+#include <string>
+
+namespace llvm {
+namespace sys {
+
+/// This function returns true, if there is possible to use some external
+/// disassembler library. False otherwise.
+bool hasDisassembler(void); 
+
+/// This function provides some "glue" code to call external disassembler
+/// libraries.
+std::string disassembleBuffer(uint8_t* start, size_t length, uint64_t pc = 0);
+
+}
+}
+
+#endif // LLVM_SYSTEM_DISASSEMBLER_H
diff --git a/include/llvm/System/DynamicLibrary.h b/include/llvm/System/DynamicLibrary.h
new file mode 100644
index 0000000..5499f9d
--- /dev/null
+++ b/include/llvm/System/DynamicLibrary.h
@@ -0,0 +1,125 @@
+//===-- llvm/System/DynamicLibrary.h - Portable Dynamic Library -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the sys::DynamicLibrary class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_DYNAMIC_LIBRARY_H
+#define LLVM_SYSTEM_DYNAMIC_LIBRARY_H
+
+#include "llvm/System/Path.h"
+#include "llvm/System/IncludeFile.h"
+#include <string>
+
+namespace llvm {
+namespace sys {
+
+  /// This class provides a portable interface to dynamic libraries which also
+  /// might be known as shared libraries, shared objects, dynamic shared
+  /// objects, or dynamic link libraries. Regardless of the terminology or the
+  /// operating system interface, this class provides a portable interface that
+  /// allows dynamic libraries to be loaded and and searched for externally
+  /// defined symbols. This is typically used to provide "plug-in" support.
+  /// It also allows for symbols to be defined which don't live in any library,
+  /// but rather the main program itself, useful on Windows where the main
+  /// executable cannot be searched.
+  /// @since 1.4
+  /// @brief Portable dynamic library abstraction.
+  class DynamicLibrary {
+    /// @name Constructors
+    /// @{
+    public:
+      /// Construct a DynamicLibrary that represents the currently executing
+      /// program. The program must have been linked with -export-dynamic or
+      /// -dlopen self for this to work. Any symbols retrieved with the
+      /// GetAddressOfSymbol function will refer to the program not to any
+      /// library.
+      /// @throws std::string indicating why the program couldn't be opened.
+      /// @brief Open program as dynamic library.
+      DynamicLibrary();
+
+      /// After destruction, the symbols of the library will no longer be
+      /// available to the program. It is important to make sure the lifespan
+      /// of a DynamicLibrary exceeds the lifetime of the pointers returned
+      /// by the GetAddressOfSymbol otherwise the program may walk off into
+      /// uncharted territory.
+      /// @see GetAddressOfSymbol.
+      /// @brief Closes the DynamicLibrary
+      ~DynamicLibrary();
+
+    /// @}
+    /// @name Functions
+    /// @{
+    public:
+      /// This function allows a library to be loaded without instantiating a
+      /// DynamicLibrary object. Consequently, it is marked as being permanent
+      /// and will only be unloaded when the program terminates.  This returns
+      /// false on success or returns true and fills in *ErrMsg on failure.
+      /// @brief Open a dynamic library permanently.
+      static bool LoadLibraryPermanently(const char* filename,
+                                         std::string *ErrMsg = 0);
+
+      /// This function will search through all previously loaded dynamic
+      /// libraries for the symbol \p symbolName. If it is found, the addressof
+      /// that symbol is returned. If not, null is returned. Note that this will
+      /// search permanently loaded libraries (LoadLibraryPermanently) as well
+      /// as ephemerally loaded libraries (constructors).
+      /// @throws std::string on error.
+      /// @brief Search through libraries for address of a symbol
+      static void* SearchForAddressOfSymbol(const char* symbolName);
+
+      /// @brief Convenience function for C++ophiles.
+      static void* SearchForAddressOfSymbol(const std::string& symbolName) {
+        return SearchForAddressOfSymbol(symbolName.c_str());
+      }
+
+      /// This functions permanently adds the symbol \p symbolName with the
+      /// value \p symbolValue.  These symbols are searched before any
+      /// libraries.
+      /// @brief Add searchable symbol/value pair.
+      static void AddSymbol(const char* symbolName, void *symbolValue);
+
+      /// @brief Convenience function for C++ophiles.
+      static void AddSymbol(const std::string& symbolName, void *symbolValue) {
+        AddSymbol(symbolName.c_str(), symbolValue);
+      }
+
+    /// @}
+    /// @name Accessors
+    /// @{
+    public:
+      /// Looks up a \p symbolName in the DynamicLibrary and returns its address
+      /// if it exists. If the symbol does not exist, returns (void*)0.
+      /// @returns the address of the symbol or 0.
+      /// @brief Get the address of a symbol in the DynamicLibrary.
+      void* GetAddressOfSymbol(const char* symbolName);
+
+      /// @brief Convenience function for C++ophiles.
+      void* GetAddressOfSymbol(const std::string& symbolName) {
+        return GetAddressOfSymbol(symbolName.c_str());
+      }
+
+    /// @}
+    /// @name Implementation
+    /// @{
+    protected:
+      void* handle;  // Opaque handle for information about the library
+
+      DynamicLibrary(const DynamicLibrary&); ///< Do not implement
+      DynamicLibrary& operator=(const DynamicLibrary&); ///< Do not implement
+    /// @}
+  };
+
+} // End sys namespace
+} // End llvm namespace
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemDynamicLibrary)
+
+#endif // LLVM_SYSTEM_DYNAMIC_LIBRARY_H
diff --git a/include/llvm/System/IncludeFile.h b/include/llvm/System/IncludeFile.h
new file mode 100644
index 0000000..c9f3882
--- /dev/null
+++ b/include/llvm/System/IncludeFile.h
@@ -0,0 +1,65 @@
+//===- llvm/System/IncludeFile.h - Ensure Linking Of Library ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the FORCE_DEFINING_FILE_TO_BE_LINKED and DEFINE_FILE_FOR
+// macros.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_INCLUDEFILE_H
+#define LLVM_SYSTEM_INCLUDEFILE_H
+
+/// This macro is the public interface that IncludeFile.h exports. This gives
+/// us the option to implement the "link the definition" capability in any 
+/// manner that we choose. All header files that depend on a specific .cpp
+/// file being linked at run time should use this macro instead of the
+/// IncludeFile class directly. 
+/// 
+/// For example, foo.h would use:<br/>
+/// <tt>FORCE_DEFINING_FILE_TO_BE_LINKED(foo)</tt><br/>
+/// 
+/// And, foo.cp would use:<br/>
+/// <tt>DEFINING_FILE_FOR(foo)</tt><br/>
+#define FORCE_DEFINING_FILE_TO_BE_LINKED(name) \
+  namespace llvm { \
+    extern char name ## LinkVar; \
+    static IncludeFile name ## LinkObj ( &name ## LinkVar ); \
+  } 
+
+/// This macro is the counterpart to FORCE_DEFINING_FILE_TO_BE_LINKED. It should
+/// be used in a .cpp file to define the name referenced in a header file that
+/// will cause linkage of the .cpp file. It should only be used at extern level.
+#define DEFINING_FILE_FOR(name) namespace llvm { char name ## LinkVar; }
+
+namespace llvm {
+
+/// This class is used in the implementation of FORCE_DEFINING_FILE_TO_BE_LINKED
+/// macro to make sure that the implementation of a header file is included 
+/// into a tool that uses the header.  This is solely 
+/// to overcome problems linking .a files and not getting the implementation 
+/// of compilation units we need. This is commonly an issue with the various
+/// Passes but also occurs elsewhere in LLVM. We like to use .a files because
+/// they link faster and provide the smallest executables. However, sometimes
+/// those executables are too small, if the program doesn't reference something
+/// that might be needed, especially by a loaded share object. This little class
+/// helps to resolve that problem. The basic strategy is to use this class in
+/// a header file and pass the address of a variable to the constructor. If the
+/// variable is defined in the header file's corresponding .cpp file then all
+/// tools/libraries that #include the header file will require the .cpp as well.
+/// For example:<br/>
+/// <tt>extern int LinkMyCodeStub;</tt><br/>
+/// <tt>static IncludeFile LinkMyModule(&LinkMyCodeStub);</tt><br/>
+/// @brief Class to ensure linking of corresponding object file.
+struct IncludeFile {
+  IncludeFile(void *);
+};
+
+}
+
+#endif
diff --git a/include/llvm/System/LICENSE.TXT b/include/llvm/System/LICENSE.TXT
new file mode 100644
index 0000000..f569da2
--- /dev/null
+++ b/include/llvm/System/LICENSE.TXT
@@ -0,0 +1,6 @@
+LLVM System Interface Library
+-------------------------------------------------------------------------------
+The LLVM System Interface Library is licensed under the Illinois Open Source 
+License and has the following additional copyright:
+
+Copyright (C) 2004 eXtensible Systems, Inc.
diff --git a/include/llvm/System/MappedFile.h b/include/llvm/System/MappedFile.h
new file mode 100644
index 0000000..6276bc3
--- /dev/null
+++ b/include/llvm/System/MappedFile.h
@@ -0,0 +1,175 @@
+//===- llvm/System/MappedFile.h - MappedFile OS Concept ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::MappedFile class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_MAPPEDFILE_H
+#define LLVM_SYSTEM_MAPPEDFILE_H
+
+#include "llvm/System/Path.h"
+#include "llvm/System/IncludeFile.h"
+
+namespace llvm {
+namespace sys {
+
+  /// Forward declare a class used for holding platform specific information
+  /// that needs to be
+  struct MappedFileInfo;
+
+  /// This class provides an abstraction for a memory mapped file in the
+  /// operating system's filesystem. It provides platform independent operations
+  /// for mapping a file into memory for both read and write access. This class
+  /// does not provide facilities for finding the file or operating on paths to
+  /// files. The sys::Path class is used for that.
+  /// @since 1.4
+  /// @brief An abstraction for memory mapped files.
+  class MappedFile {
+  /// @name Types
+  /// @{
+  public:
+    enum MappingOptions {
+      READ_ACCESS = 0x0001,     ///< Map the file for reading
+      WRITE_ACCESS = 0x0002,    ///< Map the file for write access
+      EXEC_ACCESS = 0x0004,     ///< Map the file for execution access
+      SHARED_MAPPING = 0x0008   ///< Map the file shared with other processes
+    };
+  /// @}
+  /// @name Constructors
+  /// @{
+  public:
+    /// Construct a MappedFile to the \p path in the operating system's file
+    /// system with the mapping \p options provided.
+    /// @throws std::string if an error occurs
+    MappedFile() : path_(), options_(READ_ACCESS), base_(0), info_(0) {}
+
+    /// Destruct a MappedFile and release all memory associated with it.
+    /// @throws std::string if an error occurs
+    ~MappedFile() { if (info_) terminate(); }
+
+  /// @}
+  /// @name Accessors
+  /// @{
+  public:
+    /// This function determines if the file is currently mapped or not.
+    /// @returns true iff the file is mapped into memory, false otherwise
+    /// @brief Determine if a MappedFile is currently mapped
+    /// @throws nothing
+    bool isMapped() const { return base_ != 0; }
+
+    /// This function returns a void* pointer to the base address of the file
+    /// mapping. This is the memory address of the first byte in the file.
+    /// Note that although a non-const pointer is returned, the memory might
+    /// not actually be writable, depending on the MappingOptions used when
+    /// the MappedFile was opened.
+    /// @returns The base pointer to the memory mapped file.
+    /// @brief Obtain the base pointer to the memory mapped file.
+    /// @throws nothing
+    void* base() const { return base_; }
+
+    /// This function returns a char* pointer to the base address of the file
+    /// mapping. This is the memory address of the first byte in the file.
+    /// Note that although a non-const pointer is returned, the memory might
+    /// not actually be writable, depending on the MappingOptions used when
+    /// the MappedFile was opened.
+    /// @returns The base pointer to the memory mapped file as a char pointer.
+    /// @brief Obtain the base pointer to the memory mapped file.
+    /// @throws nothing
+    char* charBase() const { return reinterpret_cast<char*>(base_); }
+
+    /// This function returns a reference to the sys::Path object kept by the
+    /// MappedFile object. This contains the path to the file that is or
+    /// will be mapped.
+    /// @returns sys::Path containing the path name.
+    /// @brief Returns the mapped file's path as a sys::Path
+    /// @throws nothing
+    const sys::Path& path() const { return path_; }
+
+    /// This function returns the number of bytes in the file.
+    /// @throws std::string if an error occurs
+    size_t size() const;
+
+  /// @}
+  /// @name Mutators
+  /// @{
+  public:
+    /// Open a file to be mapped and get its size but don't map it yet.
+    /// @returns true if an error occurred
+    bool open(
+      const sys::Path& p, ///< Path to file to be mapped
+      int options = READ_ACCESS, ///< Access mode for the mapping
+      std::string* ErrMsg = 0 ///< Optional error string pointer
+    ) {
+      path_ = p;
+      options_ = options;
+      return initialize(ErrMsg);
+    }
+
+    /// The mapped file is removed from memory. If the file was mapped for
+    /// write access, the memory contents will be automatically synchronized
+    /// with the file's disk contents.
+    /// @brief Remove the file mapping from memory.
+    void unmap();
+
+    /// The mapped file is put into memory.
+    /// @returns The base memory address of the mapped file or 0 if an error
+    /// occurred.
+    /// @brief Map the file into memory.
+    void* map(
+      std::string* ErrMsg = 0///< Optional error string pointer
+    );
+
+    /// This method causes the size of the file, and consequently the size
+    /// of the mapping to be set. This is logically the same as unmap(),
+    /// adjust size of the file, map(). Consequently, when calling this
+    /// function, the caller should not rely on previous results of the
+    /// map(), base(), or baseChar() members as they may point to invalid
+    /// areas of memory after this call.
+    /// @throws std::string if an error occurs
+    /// @brief Set the size of the file and memory mapping.
+    bool size(size_t new_size, std::string* ErrMsg = 0);
+
+    void close() { if (info_) terminate(); }
+
+  /// @}
+  /// @name Implementation
+  /// @{
+  private:
+    /// @brief Initialize platform-specific portion
+    bool initialize(std::string* ErrMsg); 
+
+    /// @brief Terminate platform-specific portion
+    void terminate();  
+
+  /// @}
+  /// @name Data
+  /// @{
+  private:
+    sys::PathWithStatus path_;       ///< Path to the file.
+    int options_;          ///< Options used to create the mapping
+    void* base_;           ///< Pointer to the base memory address
+    mutable MappedFileInfo* info_; ///< Platform specific info for the mapping
+
+  /// @}
+  /// @name Disabled
+  /// @{
+  private:
+    ///< Disallow assignment
+    MappedFile& operator = ( const MappedFile & that );
+    ///< Disallow copying
+    MappedFile(const MappedFile& that);
+  /// @}
+  };
+}
+}
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemMappedFile)
+
+#endif
diff --git a/include/llvm/System/Memory.h b/include/llvm/System/Memory.h
new file mode 100644
index 0000000..c343177
--- /dev/null
+++ b/include/llvm/System/Memory.h
@@ -0,0 +1,76 @@
+//===- llvm/System/Memory.h - Memory Support --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::Memory class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_MEMORY_H
+#define LLVM_SYSTEM_MEMORY_H
+
+#include <string>
+#include "llvm/System/IncludeFile.h"
+
+namespace llvm {
+namespace sys {
+
+  /// This class encapsulates the notion of a memory block which has an address
+  /// and a size. It is used by the Memory class (a friend) as the result of
+  /// various memory allocation operations.
+  /// @see Memory
+  /// @brief Memory block abstraction.
+  class MemoryBlock {
+  public:
+    void *base() const { return Address; }
+    unsigned size() const { return Size; }
+  private:
+    void *Address;    ///< Address of first byte of memory area
+    unsigned Size;    ///< Size, in bytes of the memory area
+    friend class Memory;
+  };
+
+  /// This class provides various memory handling functions that manipulate
+  /// MemoryBlock instances.
+  /// @since 1.4
+  /// @brief An abstraction for memory operations.
+  class Memory {
+    /// @name Functions
+    /// @{
+    public:
+      /// This method allocates a block of Read/Write/Execute memory that is
+      /// suitable for executing dynamically generated code (e.g. JIT). An
+      /// attempt to allocate \p NumBytes bytes of virtual memory is made.
+      /// \p NearBlock may point to an existing allocation in which case
+      /// an attempt is made to allocate more memory near the existing block.
+      ///
+      /// On success, this returns a non-null memory block, otherwise it returns
+      /// a null memory block and fills in *ErrMsg.
+      /// 
+      /// @brief Allocate Read/Write/Execute memory.
+      static MemoryBlock AllocateRWX(unsigned NumBytes,
+                                     const MemoryBlock *NearBlock,
+                                     std::string *ErrMsg = 0);
+
+      /// This method releases a block of Read/Write/Execute memory that was
+      /// allocated with the AllocateRWX method. It should not be used to
+      /// release any memory block allocated any other way.
+      ///
+      /// On success, this returns false, otherwise it returns true and fills
+      /// in *ErrMsg.
+      /// @throws std::string if an error occurred.
+      /// @brief Release Read/Write/Execute memory.
+      static bool ReleaseRWX(MemoryBlock &block, std::string *ErrMsg = 0);
+    /// @}
+  };
+}
+}
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemMemory)
+
+#endif
diff --git a/include/llvm/System/Mutex.h b/include/llvm/System/Mutex.h
new file mode 100644
index 0000000..27bcea1
--- /dev/null
+++ b/include/llvm/System/Mutex.h
@@ -0,0 +1,88 @@
+//===- llvm/System/Mutex.h - Mutex Operating System Concept -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::Mutex class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_MUTEX_H
+#define LLVM_SYSTEM_MUTEX_H
+
+#include "llvm/System/IncludeFile.h"
+
+namespace llvm
+{
+  namespace sys
+  {
+    /// @brief Platform agnostic Mutex class.
+    class Mutex
+    {
+    /// @name Constructors
+    /// @{
+    public:
+
+      /// Initializes the lock but doesn't acquire it. if \p recursive is set
+      /// to false, the lock will not be recursive which makes it cheaper but
+      /// also more likely to deadlock (same thread can't acquire more than
+      /// once).
+      /// @brief Default Constructor.
+      Mutex ( bool recursive = true );
+
+      /// Releases and removes the lock
+      /// @brief Destructor
+      ~Mutex ( void );
+
+    /// @}
+    /// @name Methods
+    /// @{
+    public:
+
+      /// Attempts to unconditionally acquire the lock. If the lock is held by
+      /// another thread, this method will wait until it can acquire the lock.
+      /// @returns false if any kind of error occurs, true otherwise.
+      /// @brief Unconditionally acquire the lock.
+      bool acquire();
+
+      /// Attempts to release the lock. If the lock is held by the current
+      /// thread, the lock is released allowing other threads to acquire the
+      /// lock.
+      /// @returns false if any kind of error occurs, true otherwise.
+      /// @brief Unconditionally release the lock.
+      bool release(void);
+
+      /// Attempts to acquire the lock without blocking. If the lock is not
+      /// available, this function returns false quickly (without blocking). If
+      /// the lock is available, it is acquired.
+      /// @returns false if any kind of error occurs or the lock is not
+      /// available, true otherwise.
+      /// @brief Try to acquire the lock.
+      bool tryacquire();
+
+    //@}
+    /// @name Platform Dependent Data
+    /// @{
+    private:
+#ifdef ENABLE_THREADS
+      void* data_; ///< We don't know what the data will be
+#endif
+
+    /// @}
+    /// @name Do Not Implement
+    /// @{
+    private:
+      Mutex(const Mutex & original);
+      void operator=(const Mutex &);
+    /// @}
+    };
+  }
+}
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemMutex)
+
+#endif
diff --git a/include/llvm/System/Path.h b/include/llvm/System/Path.h
new file mode 100644
index 0000000..e7aa45b
--- /dev/null
+++ b/include/llvm/System/Path.h
@@ -0,0 +1,656 @@
+//===- llvm/System/Path.h - Path Operating System Concept -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::Path class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_PATH_H
+#define LLVM_SYSTEM_PATH_H
+
+#include "llvm/System/TimeValue.h"
+#include "llvm/System/IncludeFile.h"
+#include <set>
+#include <string>
+#include <vector>
+#include <iosfwd>
+
+namespace llvm {
+namespace sys {
+
+  /// This structure provides basic file system information about a file. It
+  /// is patterned after the stat(2) Unix operating system call but made
+  /// platform independent and eliminates many of the unix-specific fields.
+  /// However, to support llvm-ar, the mode, user, and group fields are
+  /// retained. These pertain to unix security and may not have a meaningful
+  /// value on non-Unix platforms. However, the other fields fields should 
+  /// always be applicable on all platforms.  The structure is filled in by 
+  /// the PathWithStatus class.
+  /// @brief File status structure
+  class FileStatus {
+  public:
+    uint64_t    fileSize;   ///< Size of the file in bytes
+    TimeValue   modTime;    ///< Time of file's modification
+    uint32_t    mode;       ///< Mode of the file, if applicable
+    uint32_t    user;       ///< User ID of owner, if applicable
+    uint32_t    group;      ///< Group ID of owner, if applicable
+    uint64_t    uniqueID;   ///< A number to uniquely ID this file
+    bool        isDir  : 1; ///< True if this is a directory.
+    bool        isFile : 1; ///< True if this is a file.
+
+    FileStatus() : fileSize(0), modTime(0,0), mode(0777), user(999),
+                   group(999), uniqueID(0), isDir(false), isFile(false) { }
+    
+    TimeValue getTimestamp() const { return modTime; }
+    uint64_t getSize() const { return fileSize; }
+    uint32_t getMode() const { return mode; }
+    uint32_t getUser() const { return user; }
+    uint32_t getGroup() const { return group; }
+    uint64_t getUniqueID() const { return uniqueID; }
+  };
+
+  /// This class provides an abstraction for the path to a file or directory
+  /// in the operating system's filesystem and provides various basic operations
+  /// on it.  Note that this class only represents the name of a path to a file
+  /// or directory which may or may not be valid for a given machine's file
+  /// system. The class is patterned after the java.io.File class with various
+  /// extensions and several omissions (not relevant to LLVM).  A Path object
+  /// ensures that the path it encapsulates is syntactically valid for the
+  /// operating system it is running on but does not ensure correctness for
+  /// any particular file system. That is, a syntactically valid path might
+  /// specify path components that do not exist in the file system and using
+  /// such a Path to act on the file system could produce errors. There is one
+  /// invalid Path value which is permitted: the empty path.  The class should
+  /// never allow a syntactically invalid non-empty path name to be assigned.
+  /// Empty paths are required in order to indicate an error result in some
+  /// situations. If the path is empty, the isValid operation will return
+  /// false. All operations will fail if isValid is false. Operations that
+  /// change the path will either return false if it would cause a syntactically
+  /// invalid path name (in which case the Path object is left unchanged) or
+  /// throw an std::string exception indicating the error. The methods are
+  /// grouped into four basic categories: Path Accessors (provide information
+  /// about the path without accessing disk), Disk Accessors (provide
+  /// information about the underlying file or directory), Path Mutators
+  /// (change the path information, not the disk), and Disk Mutators (change
+  /// the disk file/directory referenced by the path). The Disk Mutator methods
+  /// all have the word "disk" embedded in their method name to reinforce the
+  /// notion that the operation modifies the file system.
+  /// @since 1.4
+  /// @brief An abstraction for operating system paths.
+  class Path {
+    /// @name Constructors
+    /// @{
+    public:
+      /// Construct a path to the root directory of the file system. The root
+      /// directory is a top level directory above which there are no more
+      /// directories. For example, on UNIX, the root directory is /. On Windows
+      /// it is C:\. Other operating systems may have different notions of
+      /// what the root directory is or none at all. In that case, a consistent
+      /// default root directory will be used.
+      static Path GetRootDirectory();
+
+      /// Construct a path to a unique temporary directory that is created in
+      /// a "standard" place for the operating system. The directory is
+      /// guaranteed to be created on exit from this function. If the directory
+      /// cannot be created, the function will throw an exception.
+      /// @returns an invalid path (empty) on error
+      /// @param ErrMsg Optional place for an error message if an error occurs
+      /// @brief Constrct a path to an new, unique, existing temporary
+      /// directory.
+      static Path GetTemporaryDirectory(std::string* ErrMsg = 0);
+
+      /// Construct a vector of sys::Path that contains the "standard" system
+      /// library paths suitable for linking into programs. This function *must*
+      /// return the value of LLVM_LIB_SEARCH_PATH as the first item in \p Paths
+      /// if that environment variable is set and it references a directory.
+      /// @brief Construct a path to the system library directory
+      static void GetSystemLibraryPaths(std::vector<sys::Path>& Paths);
+
+      /// Construct a vector of sys::Path that contains the "standard" bitcode
+      /// library paths suitable for linking into an llvm program. This function
+      /// *must* return the value of LLVM_LIB_SEARCH_PATH as well as the value
+      /// of LLVM_LIBDIR. It also must provide the System library paths as
+      /// returned by GetSystemLibraryPaths.
+      /// @see GetSystemLibraryPaths
+      /// @brief Construct a list of directories in which bitcode could be
+      /// found.
+      static void GetBitcodeLibraryPaths(std::vector<sys::Path>& Paths);
+
+      /// Find the path to a library using its short name. Use the system
+      /// dependent library paths to locate the library.
+      /// @brief Find a library.
+      static Path FindLibrary(std::string& short_name);
+
+      /// Construct a path to the default LLVM configuration directory. The
+      /// implementation must ensure that this is a well-known (same on many
+      /// systems) directory in which llvm configuration files exist. For
+      /// example, on Unix, the /etc/llvm directory has been selected.
+      /// @brief Construct a path to the default LLVM configuration directory
+      static Path GetLLVMDefaultConfigDir();
+
+      /// Construct a path to the LLVM installed configuration directory. The
+      /// implementation must ensure that this refers to the "etc" directory of
+      /// the LLVM installation. This is the location where configuration files
+      /// will be located for a particular installation of LLVM on a machine.
+      /// @brief Construct a path to the LLVM installed configuration directory
+      static Path GetLLVMConfigDir();
+
+      /// Construct a path to the current user's home directory. The
+      /// implementation must use an operating system specific mechanism for
+      /// determining the user's home directory. For example, the environment
+      /// variable "HOME" could be used on Unix. If a given operating system
+      /// does not have the concept of a user's home directory, this static
+      /// constructor must provide the same result as GetRootDirectory.
+      /// @brief Construct a path to the current user's "home" directory
+      static Path GetUserHomeDirectory();
+
+      /// Return the suffix commonly used on file names that contain a shared
+      /// object, shared archive, or dynamic link library. Such files are
+      /// linked at runtime into a process and their code images are shared
+      /// between processes.
+      /// @returns The dynamic link library suffix for the current platform.
+      /// @brief Return the dynamic link library suffix.
+      static std::string GetDLLSuffix();
+
+      /// This is one of the very few ways in which a path can be constructed
+      /// with a syntactically invalid name. The only *legal* invalid name is an
+      /// empty one. Other invalid names are not permitted. Empty paths are
+      /// provided so that they can be used to indicate null or error results in
+      /// other lib/System functionality.
+      /// @brief Construct an empty (and invalid) path.
+      Path() : path() {}
+      Path(const Path &that) : path(that.path) {}
+
+      /// This constructor will accept a std::string as a path. No checking is
+      /// done on this path to determine if it is valid. To determine validity
+      /// of the path, use the isValid method. 
+      /// @param p The path to assign.
+      /// @brief Construct a Path from a string.
+      explicit Path(const std::string& p) : path(p) {}
+
+      /// This constructor will accept a character range as a path.  No checking
+      /// is done on this path to determine if it is valid.  To determine
+      /// validity of the path, use the isValid method. 
+      /// @param p The path to assign.
+      /// @brief Construct a Path from a string.
+      explicit Path(const char *StrStart, unsigned StrLen)
+        : path(StrStart, StrStart+StrLen) {}
+      
+    /// @}
+    /// @name Operators
+    /// @{
+    public:
+      /// Makes a copy of \p that to \p this.
+      /// @returns \p this
+      /// @brief Assignment Operator
+      Path &operator=(const Path &that) {
+        path = that.path;
+        return *this;
+      }
+
+      /// Compares \p this Path with \p that Path for equality.
+      /// @returns true if \p this and \p that refer to the same thing.
+      /// @brief Equality Operator
+      bool operator==(const Path &that) const {
+        return 0 == path.compare(that.path);
+      }
+
+      /// Compares \p this Path with \p that Path for inequality.
+      /// @returns true if \p this and \p that refer to different things.
+      /// @brief Inequality Operator
+      bool operator!=(const Path &that) const {
+        return 0 != path.compare(that.path);
+      }
+
+      /// Determines if \p this Path is less than \p that Path. This is required
+      /// so that Path objects can be placed into ordered collections (e.g.
+      /// std::map). The comparison is done lexicographically as defined by
+      /// the std::string::compare method.
+      /// @returns true if \p this path is lexicographically less than \p that.
+      /// @brief Less Than Operator
+      bool operator<(const Path& that) const {
+        return 0 > path.compare(that.path);
+      }
+
+    /// @}
+    /// @name Path Accessors
+    /// @{
+    public:
+      /// This function will use an operating system specific algorithm to
+      /// determine if the current value of \p this is a syntactically valid
+      /// path name for the operating system. The path name does not need to
+      /// exist, validity is simply syntactical. Empty paths are always invalid.
+      /// @returns true iff the path name is syntactically legal for the
+      /// host operating system.
+      /// @brief Determine if a path is syntactically valid or not.
+      bool isValid() const;
+
+      /// This function determines if the contents of the path name are empty. 
+      /// That is, the path name has a zero length. This does NOT determine if
+      /// if the file is empty. To get the length of the file itself, Use the 
+      /// PathWithStatus::getFileStatus() method and then the getSize() method 
+      /// on the returned FileStatus object.
+      /// @returns true iff the path is empty.
+      /// @brief Determines if the path name is empty (invalid).
+      bool isEmpty() const { return path.empty(); }
+
+      /// This function returns the current contents of the path as a
+      /// std::string. This allows the underlying path string to be manipulated.
+      /// @returns std::string containing the path name.
+      /// @brief Returns the path as a std::string.
+      const std::string &toString() const { return path; }
+
+      /// This function returns the last component of the path name. The last
+      /// component is the file or directory name occuring after the last
+      /// directory separator. If no directory separator is present, the entire
+      /// path name is returned (i.e. same as toString).
+      /// @returns std::string containing the last component of the path name.
+      /// @brief Returns the last component of the path name.
+      std::string getLast() const;
+
+      /// This function strips off the path and suffix of the file or directory
+      /// name and returns just the basename. For example /a/foo.bar would cause
+      /// this function to return "foo".
+      /// @returns std::string containing the basename of the path
+      /// @brief Get the base name of the path
+      std::string getBasename() const;
+
+      /// Obtain a 'C' string for the path name.
+      /// @returns a 'C' string containing the path name.
+      /// @brief Returns the path as a C string.
+      const char *c_str() const { return path.c_str(); }
+
+    /// @}
+    /// @name Disk Accessors
+    /// @{
+    public:
+      /// This function determines if the path name in this object references
+      /// the root (top level directory) of the file system. The details of what
+      /// is considered the "root" may vary from system to system so this method
+      /// will do the necessary checking.
+      /// @returns true iff the path name references the root directory.
+      /// @brief Determines if the path references the root directory.
+      bool isRootDirectory() const;
+
+      /// This function determines if the path name is absolute, as opposed to
+      /// relative. 
+      /// @breif Determine if the path is absolute.
+      bool isAbsolute() const;
+
+      /// This function opens the file associated with the path name provided by
+      /// the Path object and reads its magic number. If the magic number at the
+      /// start of the file matches \p magic, true is returned. In all other
+      /// cases (file not found, file not accessible, etc.) it returns false.
+      /// @returns true if the magic number of the file matches \p magic.
+      /// @brief Determine if file has a specific magic number
+      bool hasMagicNumber(const std::string& magic) const;
+
+      /// This function retrieves the first \p len bytes of the file associated
+      /// with \p this. These bytes are returned as the "magic number" in the
+      /// \p Magic parameter.
+      /// @returns true if the Path is a file and the magic number is retrieved,
+      /// false otherwise.
+      /// @brief Get the file's magic number.
+      bool getMagicNumber(std::string& Magic, unsigned len) const;
+
+      /// This function determines if the path name in the object references an
+      /// archive file by looking at its magic number.
+      /// @returns true if the file starts with the magic number for an archive
+      /// file.
+      /// @brief Determine if the path references an archive file.
+      bool isArchive() const;
+
+      /// This function determines if the path name in the object references an
+      /// LLVM Bitcode file by looking at its magic number.
+      /// @returns true if the file starts with the magic number for LLVM
+      /// bitcode files.
+      /// @brief Determine if the path references a bitcode file.
+      bool isBitcodeFile() const;
+      
+      /// This function determines if the path name in the object references a
+      /// native Dynamic Library (shared library, shared object) by looking at
+      /// the file's magic number. The Path object must reference a file, not a
+      /// directory.
+      /// @return strue if the file starts with the magid number for a native
+      /// shared library.
+      /// @brief Determine if the path reference a dynamic library.
+      bool isDynamicLibrary() const;
+
+      /// This function determines if the path name references an existing file
+      /// or directory in the file system.
+      /// @returns true if the pathname references an existing file or
+      /// directory.
+      /// @brief Determines if the path is a file or directory in
+      /// the file system.
+      bool exists() const;
+
+      /// This function determines if the path name references a readable file
+      /// or directory in the file system. This function checks for
+      /// the existence and readability (by the current program) of the file
+      /// or directory.
+      /// @returns true if the pathname references a readable file.
+      /// @brief Determines if the path is a readable file or directory
+      /// in the file system.
+      bool canRead() const;
+
+      /// This function determines if the path name references a writable file
+      /// or directory in the file system. This function checks for the
+      /// existence and writability (by the current program) of the file or
+      /// directory.
+      /// @returns true if the pathname references a writable file.
+      /// @brief Determines if the path is a writable file or directory
+      /// in the file system.
+      bool canWrite() const;
+
+      /// This function determines if the path name references an executable
+      /// file in the file system. This function checks for the existence and
+      /// executability (by the current program) of the file.
+      /// @returns true if the pathname references an executable file.
+      /// @brief Determines if the path is an executable file in the file
+      /// system.
+      bool canExecute() const;
+
+      /// This function builds a list of paths that are the names of the
+      /// files and directories in a directory.
+      /// @returns true if an error occurs, true otherwise
+      /// @brief Build a list of directory's contents.
+      bool getDirectoryContents(
+        std::set<Path> &paths, ///< The resulting list of file & directory names
+        std::string* ErrMsg    ///< Optional place to return an error message.
+      ) const;
+
+    /// @}
+    /// @name Path Mutators
+    /// @{
+    public:
+      /// The path name is cleared and becomes empty. This is an invalid
+      /// path name but is the *only* invalid path name. This is provided
+      /// so that path objects can be used to indicate the lack of a
+      /// valid path being found.
+      /// @brief Make the path empty.
+      void clear() { path.clear(); }
+
+      /// This method sets the Path object to \p unverified_path. This can fail
+      /// if the \p unverified_path does not pass the syntactic checks of the
+      /// isValid() method. If verification fails, the Path object remains
+      /// unchanged and false is returned. Otherwise true is returned and the
+      /// Path object takes on the path value of \p unverified_path
+      /// @returns true if the path was set, false otherwise.
+      /// @param unverified_path The path to be set in Path object.
+      /// @brief Set a full path from a std::string
+      bool set(const std::string& unverified_path);
+
+      /// One path component is removed from the Path. If only one component is
+      /// present in the path, the Path object becomes empty. If the Path object
+      /// is empty, no change is made.
+      /// @returns false if the path component could not be removed.
+      /// @brief Removes the last directory component of the Path.
+      bool eraseComponent();
+
+      /// The \p component is added to the end of the Path if it is a legal
+      /// name for the operating system. A directory separator will be added if
+      /// needed.
+      /// @returns false if the path component could not be added.
+      /// @brief Appends one path component to the Path.
+      bool appendComponent( const std::string& component );
+
+      /// A period and the \p suffix are appended to the end of the pathname.
+      /// The precondition for this function is that the Path reference a file
+      /// name (i.e. isFile() returns true). If the Path is not a file, no
+      /// action is taken and the function returns false. If the path would
+      /// become invalid for the host operating system, false is returned.
+      /// @returns false if the suffix could not be added, true if it was.
+      /// @brief Adds a period and the \p suffix to the end of the pathname.
+      bool appendSuffix(const std::string& suffix);
+
+      /// The suffix of the filename is erased. The suffix begins with and
+      /// includes the last . character in the filename after the last directory
+      /// separator and extends until the end of the name. If no . character is
+      /// after the last directory separator, then the file name is left
+      /// unchanged (i.e. it was already without a suffix) but the function
+      /// returns false.
+      /// @returns false if there was no suffix to remove, true otherwise.
+      /// @brief Remove the suffix from a path name.
+      bool eraseSuffix();
+
+      /// The current Path name is made unique in the file system. Upon return,
+      /// the Path will have been changed to make a unique file in the file
+      /// system or it will not have been changed if the current path name is
+      /// already unique.
+      /// @throws std::string if an unrecoverable error occurs.
+      /// @brief Make the current path name unique in the file system.
+      bool makeUnique( bool reuse_current /*= true*/, std::string* ErrMsg );
+
+    /// @}
+    /// @name Disk Mutators
+    /// @{
+    public:
+      /// This method attempts to make the file referenced by the Path object
+      /// available for reading so that the canRead() method will return true.
+      /// @brief Make the file readable;
+      bool makeReadableOnDisk(std::string* ErrMsg = 0);
+
+      /// This method attempts to make the file referenced by the Path object
+      /// available for writing so that the canWrite() method will return true.
+      /// @brief Make the file writable;
+      bool makeWriteableOnDisk(std::string* ErrMsg = 0);
+
+      /// This method attempts to make the file referenced by the Path object
+      /// available for execution so that the canExecute() method will return
+      /// true.
+      /// @brief Make the file readable;
+      bool makeExecutableOnDisk(std::string* ErrMsg = 0);
+
+      /// This method allows the last modified time stamp and permission bits
+      /// to be set on the disk object referenced by the Path.
+      /// @throws std::string if an error occurs.
+      /// @returns true on error.
+      /// @brief Set the status information.
+      bool setStatusInfoOnDisk(const FileStatus &SI,
+                               std::string *ErrStr = 0) const;
+
+      /// This method attempts to create a directory in the file system with the
+      /// same name as the Path object. The \p create_parents parameter controls
+      /// whether intermediate directories are created or not. if \p
+      /// create_parents is true, then an attempt will be made to create all
+      /// intermediate directories, as needed. If \p create_parents is false,
+      /// then only the final directory component of the Path name will be
+      /// created. The created directory will have no entries.
+      /// @returns true if the directory could not be created, false otherwise
+      /// @brief Create the directory this Path refers to.
+      bool createDirectoryOnDisk( 
+        bool create_parents = false, ///<  Determines whether non-existent 
+           ///< directory components other than the last one (the "parents") 
+           ///< are created or not.
+        std::string* ErrMsg = 0 ///< Optional place to put error messages.
+      );
+
+      /// This method attempts to create a file in the file system with the same
+      /// name as the Path object. The intermediate directories must all exist
+      /// at the time this method is called. Use createDirectoriesOnDisk to
+      /// accomplish that. The created file will be empty upon return from this
+      /// function.
+      /// @returns true if the file could not be created, false otherwise.
+      /// @brief Create the file this Path refers to.
+      bool createFileOnDisk(
+        std::string* ErrMsg = 0 ///< Optional place to put error messages.
+      );
+
+      /// This is like createFile except that it creates a temporary file. A
+      /// unique temporary file name is generated based on the contents of
+      /// \p this before the call. The new name is assigned to \p this and the
+      /// file is created.  Note that this will both change the Path object
+      /// *and* create the corresponding file. This function will ensure that
+      /// the newly generated temporary file name is unique in the file system.
+      /// @returns true if the file couldn't be created, false otherwise. 
+      /// @brief Create a unique temporary file
+      bool createTemporaryFileOnDisk(
+        bool reuse_current = false, ///< When set to true, this parameter 
+          ///< indicates that if the current file name does not exist then 
+          ///< it will be used without modification.
+        std::string* ErrMsg = 0 ///< Optional place to put error messages
+      );
+
+      /// This method renames the file referenced by \p this as \p newName. The
+      /// file referenced by \p this must exist. The file referenced by
+      /// \p newName does not need to exist.
+      /// @returns true on error, false otherwise
+      /// @brief Rename one file as another.
+      bool renamePathOnDisk(const Path& newName, std::string* ErrMsg);
+
+      /// This method attempts to destroy the file or directory named by the
+      /// last component of the Path. If the Path refers to a directory and the
+      /// \p destroy_contents is false, an attempt will be made to remove just
+      /// the directory (the final Path component). If \p destroy_contents is
+      /// true, an attempt will be made to remove the entire contents of the
+      /// directory, recursively. If the Path refers to a file, the
+      /// \p destroy_contents parameter is ignored.
+      /// @param destroy_contents Indicates whether the contents of a destroyed
+      /// directory should also be destroyed (recursively).
+      /// @returns false if the file/directory was destroyed, true on error.
+      /// @brief Removes the file or directory from the filesystem.
+      bool eraseFromDisk(bool destroy_contents = false,
+                         std::string *Err = 0) const;
+    /// @}
+    /// @name Data
+    /// @{
+    protected:
+      mutable std::string path;   ///< Storage for the path name.
+
+    /// @}
+  };
+
+  /// This class is identical to Path class except it allows you to obtain the
+  /// file status of the Path as well. The reason for the distinction is one of
+  /// efficiency. First, the file status requires additional space and the space
+  /// is incorporated directly into PathWithStatus without an additional malloc.
+  /// Second, obtaining status information is an expensive operation on most
+  /// operating systems so we want to be careful and explicity about where we
+  /// allow this operation in LLVM.
+  /// @brief Path with file status class.
+  class PathWithStatus : public Path {
+    /// @name Constructors
+    /// @{
+    public: 
+      /// @brief Default constructor
+      PathWithStatus() : Path(), status(), fsIsValid(false) {}
+
+      /// @brief Copy constructor
+      PathWithStatus(const PathWithStatus &that) 
+        : Path(static_cast<const Path&>(that)), status(that.status), 
+           fsIsValid(that.fsIsValid) {}
+
+      /// This constructor allows construction from a Path object
+      /// @brief Path constructor
+      PathWithStatus(const Path &other) 
+        : Path(other), status(), fsIsValid(false) {}
+
+      /// This constructor will accept a std::string as a path. No checking is
+      /// done on this path to determine if it is valid. To determine validity
+      /// of the path, use the isValid method. 
+      /// @param p The path to assign.
+      /// @brief Construct a Path from a string.
+      explicit PathWithStatus(const std::string& p) 
+        : Path(p), status(), fsIsValid(false) {}
+
+      /// This constructor will accept a character range as a path.  No checking
+      /// is done on this path to determine if it is valid.  To determine
+      /// validity of the path, use the isValid method. 
+      /// @param p The path to assign.
+      /// @brief Construct a Path from a string.
+      explicit PathWithStatus(const char *StrStart, unsigned StrLen)
+        : Path(StrStart, StrLen), status(), fsIsValid(false) {}
+
+      /// Makes a copy of \p that to \p this.
+      /// @returns \p this
+      /// @brief Assignment Operator
+      PathWithStatus &operator=(const PathWithStatus &that) {
+        static_cast<Path&>(*this) = static_cast<const Path&>(that);
+        status = that.status;
+        fsIsValid = that.fsIsValid;
+        return *this;
+      }
+
+      /// Makes a copy of \p that to \p this.
+      /// @returns \p this
+      /// @brief Assignment Operator
+      PathWithStatus &operator=(const Path &that) {
+        static_cast<Path&>(*this) = static_cast<const Path&>(that);
+        fsIsValid = false;
+        return *this;
+      }
+
+    /// @}
+    /// @name Methods
+    /// @{
+    public:
+      /// This function returns status information about the file. The type of
+      /// path (file or directory) is updated to reflect the actual contents
+      /// of the file system.
+      /// @returns 0 on failure, with Error explaining why (if non-zero)
+      /// @returns a pointer to a FileStatus structure on success.
+      /// @brief Get file status.
+      const FileStatus *getFileStatus(
+        bool forceUpdate = false, ///< Force an update from the file system
+        std::string *Error = 0    ///< Optional place to return an error msg.
+      ) const;
+
+    /// @}
+    /// @name Data
+    /// @{
+    private:
+      mutable FileStatus status; ///< Status information.
+      mutable bool fsIsValid;    ///< Whether we've obtained it or not
+
+    /// @}
+  };
+
+  /// This enumeration delineates the kinds of files that LLVM knows about.
+  enum LLVMFileType {
+    Unknown_FileType = 0,              ///< Unrecognized file
+    Bitcode_FileType,                  ///< Bitcode file
+    Archive_FileType,                  ///< ar style archive file
+    ELF_Relocatable_FileType,          ///< ELF Relocatable object file
+    ELF_Executable_FileType,           ///< ELF Executable image
+    ELF_SharedObject_FileType,         ///< ELF dynamically linked shared lib
+    ELF_Core_FileType,                 ///< ELF core image
+    Mach_O_Object_FileType,            ///< Mach-O Object file
+    Mach_O_Executable_FileType,        ///< Mach-O Executable
+    Mach_O_FixedVirtualMemorySharedLib_FileType, ///< Mach-O Shared Lib, FVM
+    Mach_O_Core_FileType,              ///< Mach-O Core File
+    Mach_O_PreloadExectuable_FileType, ///< Mach-O Preloaded Executable
+    Mach_O_DynamicallyLinkedSharedLib_FileType, ///< Mach-O dynlinked shared lib
+    Mach_O_DynamicLinker_FileType,     ///< The Mach-O dynamic linker
+    Mach_O_Bundle_FileType,            ///< Mach-O Bundle file
+    Mach_O_DynamicallyLinkedSharedLibStub_FileType, ///< Mach-O Shared lib stub
+    COFF_FileType                      ///< COFF object file or lib
+  };
+
+  /// This utility function allows any memory block to be examined in order
+  /// to determine its file type.
+  LLVMFileType IdentifyFileType(const char*magic, unsigned length);
+
+  /// This function can be used to copy the file specified by Src to the
+  /// file specified by Dest. If an error occurs, Dest is removed.
+  /// @returns true if an error occurs, false otherwise
+  /// @brief Copy one file to another.
+  bool CopyFile(const Path& Dest, const Path& Src, std::string* ErrMsg);
+}
+
+std::ostream& operator<<(std::ostream& strm, const sys::Path& aPath);
+inline std::ostream& operator<<(std::ostream& strm, 
+                                const sys::PathWithStatus& aPath) {
+  strm << static_cast<const sys::Path&>(aPath);
+  return strm;
+}
+
+}
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemPath)
+#endif
diff --git a/include/llvm/System/Process.h b/include/llvm/System/Process.h
new file mode 100644
index 0000000..f843af3
--- /dev/null
+++ b/include/llvm/System/Process.h
@@ -0,0 +1,105 @@
+//===- llvm/System/Process.h ------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::Process class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_PROCESS_H
+#define LLVM_SYSTEM_PROCESS_H
+
+#include "llvm/System/TimeValue.h"
+#include "llvm/System/IncludeFile.h"
+
+namespace llvm {
+namespace sys {
+
+  /// This class provides an abstraction for getting information about the
+  /// currently executing process.
+  /// @since 1.4
+  /// @brief An abstraction for operating system processes.
+  class Process {
+    /// @name Accessors
+    /// @{
+    public:
+      /// This static function will return the operating system's virtual memory
+      /// page size.
+      /// @returns The number of bytes in a virtual memory page.
+      /// @throws nothing
+      /// @brief Get the virtual memory page size
+      static unsigned GetPageSize();
+
+      /// This static function will return the total amount of memory allocated
+      /// by the process. This only counts the memory allocated via the malloc,
+      /// calloc and realloc functions and includes any "free" holes in the
+      /// allocated space.
+      /// @throws nothing
+      /// @brief Return process memory usage.
+      static size_t GetMallocUsage();
+
+      /// This static function will return the total memory usage of the
+      /// process. This includes code, data, stack and mapped pages usage. Notei
+      /// that the value returned here is not necessarily the Running Set Size,
+      /// it is the total virtual memory usage, regardless of mapped state of
+      /// that memory.
+      static size_t GetTotalMemoryUsage();
+
+      /// This static function will set \p user_time to the amount of CPU time
+      /// spent in user (non-kernel) mode and \p sys_time to the amount of CPU
+      /// time spent in system (kernel) mode.  If the operating system does not
+      /// support collection of these metrics, a zero TimeValue will be for both
+      /// values.
+      static void GetTimeUsage(
+        TimeValue& elapsed,
+          ///< Returns the TimeValue::now() giving current time
+        TimeValue& user_time,
+          ///< Returns the current amount of user time for the process
+        TimeValue& sys_time
+          ///< Returns the current amount of system time for the process
+      );
+
+      /// This static function will return the process' current user id number.
+      /// Not all operating systems support this feature. Where it is not
+      /// supported, the function should return 65536 as the value.
+      static int GetCurrentUserId();
+
+      /// This static function will return the process' current group id number.
+      /// Not all operating systems support this feature. Where it is not
+      /// supported, the function should return 65536 as the value.
+      static int GetCurrentGroupId();
+
+      /// This function makes the necessary calls to the operating system to
+      /// prevent core files or any other kind of large memory dumps that can
+      /// occur when a program fails.
+      /// @brief Prevent core file generation.
+      static void PreventCoreFiles();
+
+      /// This function determines if the standard input is connected directly
+      /// to a user's input (keyboard probably), rather than coming from a file
+      /// or pipe.
+      static bool StandardInIsUserInput();
+
+      /// This function determines if the standard output is connected to a
+      /// "tty" or "console" window. That is, the output would be displayed to
+      /// the user rather than being put on a pipe or stored in a file.
+      static bool StandardOutIsDisplayed();
+
+      /// This function determines if the standard error is connected to a
+      /// "tty" or "console" window. That is, the output would be displayed to
+      /// the user rather than being put on a pipe or stored in a file.
+      static bool StandardErrIsDisplayed();
+
+    /// @}
+  };
+}
+}
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemProcess)
+
+#endif
diff --git a/include/llvm/System/Program.h b/include/llvm/System/Program.h
new file mode 100644
index 0000000..cef3805
--- /dev/null
+++ b/include/llvm/System/Program.h
@@ -0,0 +1,95 @@
+//===- llvm/System/Program.h ------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::Program class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_PROGRAM_H
+#define LLVM_SYSTEM_PROGRAM_H
+
+#include "llvm/System/Path.h"
+#include "llvm/System/IncludeFile.h"
+#include <vector>
+
+namespace llvm {
+namespace sys {
+
+  /// This class provides an abstraction for programs that are executable by the
+  /// operating system. It provides a platform generic way to find executable
+  /// programs from the path and to execute them in various ways. The sys::Path
+  /// class is used to specify the location of the Program.
+  /// @since 1.4
+  /// @brief An abstraction for finding and executing programs.
+  class Program {
+    /// @name Methods
+    /// @{
+    public:
+      /// This static constructor (factory) will attempt to locate a program in
+      /// the operating system's file system using some pre-determined set of
+      /// locations to search (e.g. the PATH on Unix).
+      /// @returns A Path object initialized to the path of the program or a
+      /// Path object that is empty (invalid) if the program could not be found.
+      /// @throws nothing
+      /// @brief Construct a Program by finding it by name.
+      static Path FindProgramByName(const std::string& name);
+
+      /// This function executes the program using the \p arguments provided and
+      /// waits for the program to exit. This function will block the current
+      /// program until the invoked program exits. The invoked program will
+      /// inherit the stdin, stdout, and stderr file descriptors, the
+      /// environment and other configuration settings of the invoking program.
+      /// If Path::executable() does not return true when this function is
+      /// called then a std::string is thrown.
+      /// @returns an integer result code indicating the status of the program.
+      /// A zero or positive value indicates the result code of the program. A
+      /// negative value is the signal number on which it terminated. 
+      /// @see FindProgrambyName
+      /// @brief Executes the program with the given set of \p args.
+      static int ExecuteAndWait(
+        const Path& path,  ///< sys::Path object providing the path of the 
+          ///< program to be executed. It is presumed this is the result of 
+          ///< the FindProgramByName method.
+        const char** args, ///< A vector of strings that are passed to the
+          ///< program.  The first element should be the name of the program.
+          ///< The list *must* be terminated by a null char* entry.
+        const char ** env = 0, ///< An optional vector of strings to use for
+          ///< the program's environment. If not provided, the current program's
+          ///< environment will be used.
+        const sys::Path** redirects = 0, ///< An optional array of pointers to
+          ///< Paths. If the array is null, no redirection is done. The array
+          ///< should have a size of at least three. If the pointer in the array
+          ///< are not null, then the inferior process's stdin(0), stdout(1),
+          ///< and stderr(2) will be redirected to the corresponding Paths.
+        unsigned secondsToWait = 0, ///< If non-zero, this specifies the amount
+          ///< of time to wait for the child process to exit. If the time
+          ///< expires, the child is killed and this call returns. If zero,
+          ///< this function will wait until the child finishes or forever if
+          ///< it doesn't.
+        unsigned memoryLimit = 0, ///< If non-zero, this specifies max. amount
+          ///< of memory can be allocated by process. If memory usage will be
+          ///< higher limit, the child is killed and this call returns. If zero -
+          ///< no memory limit.
+        std::string* ErrMsg = 0 ///< If non-zero, provides a pointer to a string
+          ///< instance in which error messages will be returned. If the string 
+          ///< is non-empty upon return an error occurred while invoking the
+          ///< program.
+      );
+      // These methods change the specified standard stream (stdin or stdout) to
+      // binary mode. They return true if an error occurred
+      static bool ChangeStdinToBinary();
+      static bool ChangeStdoutToBinary();
+    /// @}
+  };
+}
+}
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemProgram)
+
+#endif
diff --git a/include/llvm/System/Signals.h b/include/llvm/System/Signals.h
new file mode 100644
index 0000000..f4b8b14
--- /dev/null
+++ b/include/llvm/System/Signals.h
@@ -0,0 +1,55 @@
+//===- llvm/System/Signals.h - Signal Handling support ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines some helpful functions for dealing with the possibility of
+// unix signals occuring while your program is running.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_SIGNALS_H
+#define LLVM_SYSTEM_SIGNALS_H
+
+#include "llvm/System/Path.h"
+#include "llvm/System/IncludeFile.h"
+
+namespace llvm {
+namespace sys {
+
+  /// This function registers signal handlers to ensure that if a signal gets
+  /// delivered that the named file is removed.
+  /// @brief Remove a file if a fatal signal occurs.
+  bool RemoveFileOnSignal(const Path &Filename, std::string* ErrMsg = 0);
+
+  /// This function registers a signal handler to ensure that if a fatal signal
+  /// gets delivered to the process that the named directory and all its
+  /// contents are removed.
+  /// @brief Remove a directory if a fatal signal occurs.
+  bool RemoveDirectoryOnSignal(const Path& path, std::string* ErrMsg = 0);
+
+  /// When an error signal (such as SIBABRT or SIGSEGV) is delivered to the
+  /// process, print a stack trace and then exit.
+  /// @brief Print a stack trace if a fatal signal occurs.
+  void PrintStackTraceOnErrorSignal();
+
+  /// This function registers a function to be called when the user "interrupts"
+  /// the program (typically by pressing ctrl-c).  When the user interrupts the
+  /// program, the specified interrupt function is called instead of the program
+  /// being killed, and the interrupt function automatically disabled.  Note
+  /// that interrupt functions are not allowed to call any non-reentrant
+  /// functions.  An null interrupt function pointer disables the current
+  /// installed function.  Note also that the handler may be executed on a
+  /// different thread on some platforms.
+  /// @brief Register a function to be called when ctrl-c is pressed.
+  void SetInterruptFunction(void (*IF)());
+} // End sys namespace
+} // End llvm namespace
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemSignals)
+
+#endif
diff --git a/include/llvm/System/TimeValue.h b/include/llvm/System/TimeValue.h
new file mode 100644
index 0000000..93610b8
--- /dev/null
+++ b/include/llvm/System/TimeValue.h
@@ -0,0 +1,385 @@
+//===-- TimeValue.h - Declare OS TimeValue Concept --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This header file declares the operating system TimeValue concept.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/DataTypes.h"
+#include "llvm/System/IncludeFile.h"
+#include <string>
+
+#ifndef LLVM_SYSTEM_TIMEVALUE_H
+#define LLVM_SYSTEM_TIMEVALUE_H
+
+namespace llvm {
+namespace sys {
+  /// This class is used where a precise fixed point in time is required. The
+  /// range of TimeValue spans many hundreds of billions of years both past and
+  /// present.  The precision of TimeValue is to the nanosecond. However, the
+  /// actual precision of its values will be determined by the resolution of
+  /// the system clock. The TimeValue class is used in conjunction with several
+  /// other lib/System interfaces to specify the time at which a call should
+  /// timeout, etc.
+  /// @since 1.4
+  /// @brief Provides an abstraction for a fixed point in time.
+  class TimeValue {
+
+  /// @name Constants
+  /// @{
+  public:
+
+    /// A constant TimeValue representing the smallest time
+    /// value permissable by the class. MinTime is some point
+    /// in the distant past, about 300 billion years BCE.
+    /// @brief The smallest possible time value.
+    static const TimeValue MinTime;
+
+    /// A constant TimeValue representing the largest time
+    /// value permissable by the class. MaxTime is some point
+    /// in the distant future, about 300 billion years AD.
+    /// @brief The largest possible time value.
+    static const TimeValue MaxTime;
+
+    /// A constant TimeValue representing the base time,
+    /// or zero time of 00:00:00 (midnight) January 1st, 2000.
+    /// @brief 00:00:00 Jan 1, 2000 UTC.
+    static const TimeValue ZeroTime;
+
+    /// A constant TimeValue for the Posix base time which is
+    /// 00:00:00 (midnight) January 1st, 1970.
+    /// @brief 00:00:00 Jan 1, 1970 UTC.
+    static const TimeValue PosixZeroTime;
+
+    /// A constant TimeValue for the Win32 base time which is
+    /// 00:00:00 (midnight) January 1st, 1601.
+    /// @brief 00:00:00 Jan 1, 1601 UTC.
+    static const TimeValue Win32ZeroTime;
+
+  /// @}
+  /// @name Types
+  /// @{
+  public:
+    typedef int64_t SecondsType;        ///< Type used for representing seconds.
+    typedef int32_t NanoSecondsType;    ///< Type used for representing nanoseconds.
+
+    enum TimeConversions {
+      NANOSECONDS_PER_SECOND = 1000000000,  ///< One Billion
+      MICROSECONDS_PER_SECOND = 1000000,    ///< One Million
+      MILLISECONDS_PER_SECOND = 1000,       ///< One Thousand
+      NANOSECONDS_PER_MICROSECOND = 1000,   ///< One Thousand
+      NANOSECONDS_PER_MILLISECOND = 1000000,///< One Million
+      NANOSECONDS_PER_POSIX_TICK = 100,     ///< Posix tick is 100 Hz (10ms)
+      NANOSECONDS_PER_WIN32_TICK = 100      ///< Win32 tick is 100 Hz (10ms)
+    };
+
+  /// @}
+  /// @name Constructors
+  /// @{
+  public:
+    /// Caller provides the exact value in seconds and nanoseconds. The
+    /// \p nanos argument defaults to zero for convenience.
+    /// @brief Explicit constructor
+    explicit TimeValue (SecondsType seconds, NanoSecondsType nanos = 0)
+      : seconds_( seconds ), nanos_( nanos ) { this->normalize(); }
+
+    /// Caller provides the exact value as a double in seconds with the
+    /// fractional part representing nanoseconds.
+    /// @brief Double Constructor.
+    explicit TimeValue( double new_time )
+      : seconds_( 0 ) , nanos_ ( 0 ) {
+      SecondsType integer_part = static_cast<SecondsType>( new_time );
+      seconds_ = integer_part;
+      nanos_ = static_cast<NanoSecondsType>( (new_time -
+               static_cast<double>(integer_part)) * NANOSECONDS_PER_SECOND );
+      this->normalize();
+    }
+
+    /// This is a static constructor that returns a TimeValue that represents
+    /// the current time.
+    /// @brief Creates a TimeValue with the current time (UTC).
+    static TimeValue now();
+
+  /// @}
+  /// @name Operators
+  /// @{
+  public:
+    /// Add \p that to \p this.
+    /// @returns this
+    /// @brief Incrementing assignment operator.
+    TimeValue& operator += (const TimeValue& that ) {
+      this->seconds_ += that.seconds_  ;
+      this->nanos_ += that.nanos_ ;
+      this->normalize();
+      return *this;
+    }
+
+    /// Subtract \p that from \p this.
+    /// @returns this
+    /// @brief Decrementing assignment operator.
+    TimeValue& operator -= (const TimeValue &that ) {
+      this->seconds_ -= that.seconds_ ;
+      this->nanos_ -= that.nanos_ ;
+      this->normalize();
+      return *this;
+    }
+
+    /// Determine if \p this is less than \p that.
+    /// @returns True iff *this < that.
+    /// @brief True if this < that.
+    int operator < (const TimeValue &that) const { return that > *this; }
+
+    /// Determine if \p this is greather than \p that.
+    /// @returns True iff *this > that.
+    /// @brief True if this > that.
+    int operator > (const TimeValue &that) const {
+      if ( this->seconds_ > that.seconds_ ) {
+          return 1;
+      } else if ( this->seconds_ == that.seconds_ ) {
+          if ( this->nanos_ > that.nanos_ ) return 1;
+      }
+      return 0;
+    }
+
+    /// Determine if \p this is less than or equal to \p that.
+    /// @returns True iff *this <= that.
+    /// @brief True if this <= that.
+    int operator <= (const TimeValue &that) const { return that >= *this; }
+
+    /// Determine if \p this is greater than or equal to \p that.
+    /// @returns True iff *this >= that.
+    /// @brief True if this >= that.
+    int operator >= (const TimeValue &that) const {
+      if ( this->seconds_ > that.seconds_ ) {
+          return 1;
+      } else if ( this->seconds_ == that.seconds_ ) {
+          if ( this->nanos_ >= that.nanos_ ) return 1;
+      }
+      return 0;
+    }
+
+    /// Determines if two TimeValue objects represent the same moment in time.
+    /// @brief True iff *this == that.
+    /// @brief True if this == that.
+    int operator == (const TimeValue &that) const {
+      return (this->seconds_ == that.seconds_) &&
+             (this->nanos_ == that.nanos_);
+    }
+
+    /// Determines if two TimeValue objects represent times that are not the
+    /// same.
+    /// @return True iff *this != that.
+    /// @brief True if this != that.
+    int operator != (const TimeValue &that) const { return !(*this == that); }
+
+    /// Adds two TimeValue objects together.
+    /// @returns The sum of the two operands as a new TimeValue
+    /// @brief Addition operator.
+    friend TimeValue operator + (const TimeValue &tv1, const TimeValue &tv2);
+
+    /// Subtracts two TimeValue objects.
+    /// @returns The difference of the two operands as a new TimeValue
+    /// @brief Subtraction operator.
+    friend TimeValue operator - (const TimeValue &tv1, const TimeValue &tv2);
+
+  /// @}
+  /// @name Accessors
+  /// @{
+  public:
+
+    /// Returns only the seconds component of the TimeValue. The nanoseconds
+    /// portion is ignored. No rounding is performed.
+    /// @brief Retrieve the seconds component
+    SecondsType seconds() const { return seconds_; }
+
+    /// Returns only the nanoseconds component of the TimeValue. The seconds
+    /// portion is ignored.
+    /// @brief Retrieve the nanoseconds component.
+    NanoSecondsType nanoseconds() const { return nanos_; }
+
+    /// Returns only the fractional portion of the TimeValue rounded down to the
+    /// nearest microsecond (divide by one thousand).
+    /// @brief Retrieve the fractional part as microseconds;
+    uint32_t microseconds() const {
+      return nanos_ / NANOSECONDS_PER_MICROSECOND;
+    }
+
+    /// Returns only the fractional portion of the TimeValue rounded down to the
+    /// nearest millisecond (divide by one million).
+    /// @brief Retrieve the fractional part as milliseconds;
+    uint32_t milliseconds() const {
+      return nanos_ / NANOSECONDS_PER_MILLISECOND;
+    }
+
+    /// Returns the TimeValue as a number of microseconds. Note that the value
+    /// returned can overflow because the range of a uint64_t is smaller than
+    /// the range of a TimeValue. Nevertheless, this is useful on some operating
+    /// systems and is therefore provided.
+    /// @brief Convert to a number of microseconds (can overflow)
+    uint64_t usec() const {
+      return seconds_ * MICROSECONDS_PER_SECOND +
+             ( nanos_ / NANOSECONDS_PER_MICROSECOND );
+    }
+
+    /// Returns the TimeValue as a number of milliseconds. Note that the value
+    /// returned can overflow because the range of a uint64_t is smaller than
+    /// the range of a TimeValue. Nevertheless, this is useful on some operating
+    /// systems and is therefore provided.
+    /// @brief Convert to a number of milliseconds (can overflow)
+    uint64_t msec() const {
+      return seconds_ * MILLISECONDS_PER_SECOND +
+             ( nanos_ / NANOSECONDS_PER_MILLISECOND );
+    }
+
+    /// Converts the TimeValue into the corresponding number of "ticks" for
+    /// Posix, correcting for the difference in Posix zero time.
+    /// @brief Convert to unix time (100 nanoseconds since 12:00:00a Jan 1,1970)
+    uint64_t toPosixTime() const {
+      uint64_t result = seconds_ - PosixZeroTime.seconds_;
+      result += nanos_ / NANOSECONDS_PER_POSIX_TICK;
+      return result;
+    }
+
+    /// Converts the TimeValue into the corresponding number of seconds
+    /// since the epoch (00:00:00 Jan 1,1970).
+    uint64_t toEpochTime() const {
+      return seconds_ - PosixZeroTime.seconds_;
+    }
+
+    /// Converts the TiemValue into the correspodning number of "ticks" for
+    /// Win32 platforms, correcting for the difference in Win32 zero time.
+    /// @brief Convert to windows time (seconds since 12:00:00a Jan 1, 1601)
+    uint64_t toWin32Time() const {
+      uint64_t result = seconds_ - Win32ZeroTime.seconds_;
+      result += nanos_ / NANOSECONDS_PER_WIN32_TICK;
+      return result;
+    }
+
+    /// Provides the seconds and nanoseconds as results in its arguments after
+    /// correction for the Posix zero time.
+    /// @brief Convert to timespec time (ala POSIX.1b)
+    void getTimespecTime( uint64_t& seconds, uint32_t& nanos ) const {
+      seconds = seconds_ - PosixZeroTime.seconds_;
+      nanos = nanos_;
+    }
+
+    /// Provides conversion of the TimeValue into a readable time & date.
+    /// @returns std::string containing the readable time value
+    /// @brief Convert time to a string.
+    std::string toString() const;
+
+  /// @}
+  /// @name Mutators
+  /// @{
+  public:
+    /// The seconds component of the TimeValue is set to \p sec without
+    /// modifying the nanoseconds part.  This is useful for whole second
+    /// arithmetic.
+    /// @brief Set the seconds component.
+    void seconds (SecondsType sec ) {
+      this->seconds_ = sec;
+      this->normalize();
+    }
+
+    /// The nanoseconds component of the TimeValue is set to \p nanos without
+    /// modifying the seconds part. This is useful for basic computations
+    /// involving just the nanoseconds portion. Note that the TimeValue will be
+    /// normalized after this call so that the fractional (nanoseconds) portion
+    /// will have the smallest equivalent value.
+    /// @brief Set the nanoseconds component using a number of nanoseconds.
+    void nanoseconds ( NanoSecondsType nanos ) {
+      this->nanos_ = nanos;
+      this->normalize();
+    }
+
+    /// The seconds component remains unchanged.
+    /// @brief Set the nanoseconds component using a number of microseconds.
+    void microseconds ( int32_t micros ) {
+      this->nanos_ = micros * NANOSECONDS_PER_MICROSECOND;
+      this->normalize();
+    }
+
+    /// The seconds component remains unchanged.
+    /// @brief Set the nanoseconds component using a number of milliseconds.
+    void milliseconds ( int32_t millis ) {
+      this->nanos_ = millis * NANOSECONDS_PER_MILLISECOND;
+      this->normalize();
+    }
+
+    /// @brief Converts from microsecond format to TimeValue format
+    void usec( int64_t microseconds ) {
+      this->seconds_ = microseconds / MICROSECONDS_PER_SECOND;
+      this->nanos_ = NanoSecondsType(microseconds % MICROSECONDS_PER_SECOND) *
+        NANOSECONDS_PER_MICROSECOND;
+      this->normalize();
+    }
+
+    /// @brief Converts from millisecond format to TimeValue format
+    void msec( int64_t milliseconds ) {
+      this->seconds_ = milliseconds / MILLISECONDS_PER_SECOND;
+      this->nanos_ = NanoSecondsType(milliseconds % MILLISECONDS_PER_SECOND) *
+        NANOSECONDS_PER_MILLISECOND;
+      this->normalize();
+    }
+
+    /// Converts the \p seconds argument from PosixTime to the corresponding
+    /// TimeValue and assigns that value to \p this.
+    /// @brief Convert seconds form PosixTime to TimeValue
+    void fromEpochTime( SecondsType seconds ) {
+      seconds_ = seconds + PosixZeroTime.seconds_;
+      nanos_ = 0;
+      this->normalize();
+    }
+
+    /// Converts the \p win32Time argument from Windows FILETIME to the
+    /// corresponding TimeValue and assigns that value to \p this.
+    /// @brief Convert seconds form Windows FILETIME to TimeValue
+    void fromWin32Time( uint64_t win32Time ) {
+      this->seconds_ = win32Time / 10000000 + Win32ZeroTime.seconds_;
+      this->nanos_ = NanoSecondsType(win32Time  % 10000000) * 100;
+    }
+
+  /// @}
+  /// @name Implementation
+  /// @{
+  private:
+    /// This causes the values to be represented so that the fractional
+    /// part is minimized, possibly incrementing the seconds part.
+    /// @brief Normalize to canonical form.
+    void normalize();
+
+  /// @}
+  /// @name Data
+  /// @{
+  private:
+    /// Store the values as a <timeval>.
+    SecondsType      seconds_;///< Stores the seconds part of the TimeVal
+    NanoSecondsType  nanos_;  ///< Stores the nanoseconds part of the TimeVal
+  /// @}
+
+  };
+
+inline TimeValue operator + (const TimeValue &tv1, const TimeValue &tv2) {
+  TimeValue sum (tv1.seconds_ + tv2.seconds_, tv1.nanos_ + tv2.nanos_);
+  sum.normalize ();
+  return sum;
+}
+
+inline TimeValue operator - (const TimeValue &tv1, const TimeValue &tv2) {
+  TimeValue difference (tv1.seconds_ - tv2.seconds_, tv1.nanos_ - tv2.nanos_ );
+  difference.normalize ();
+  return difference;
+}
+
+}
+}
+
+FORCE_DEFINING_FILE_TO_BE_LINKED(SystemTimeValue)
+
+#endif