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diff --git a/include/llvm/CodeGen/MachineRegInfo.h b/include/llvm/CodeGen/MachineRegInfo.h
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+/* Title:   MachineRegInfo.h
+   Author:  Ruchira Sasanka
+   Date:    Aug 20, 01
+   Purpose: Contains the description of machine register classes.
+
+   Notes:
+
+   A machine will have several register classes. For each register class, the
+   machine has to provide a class which is derived class of the virtual class
+   MachineRegClass. This virtual class itself is machine independent but 
+   the derived classes are all machine dependent.
+*/
+
+
+#ifndef MACHINE_REG_INFO_H
+#define MACHINE_REG_INFO_H
+
+#include "llvm/CodeGen/MachineInstr.h"
+
+
+
+// This is the virtual class which must be subclassed by all machine specific
+// register classes.
+
+  unsigned RegClassID;        // integer ID of a reg class
+  unsigned NumOfAvailRegs;    // # of avail for coloring (without SP, g0 etc)
+  unsigned NumOfAllRegs;      // # of all registers (including SP, g0 etc
+
+
+class MachineRegClass 
+{
+
+ private:
+  const unsigned RegClassID;
+
+ public:
+
+  virtual unsigned getRegClassID() const = 0;
+
+  // Number of registes available for coloring (e.g., without SP, g0 etc)
+  virtual unsigned getNumOfAvailRegs() const = 0;
+
+  // Number of all registers (e.g., including SP, g0 etc)
+  virtual unsigned getNumOfAllRegs() const = 0;
+
+  // This method should find a color which is not used by neighbors
+  // (i.e., a false position in IsColorUsedArr) and 
+  virtual void colorIGNode(IGNode * Node, bool IsColorUsedArr[] ) const = 0;
+
+
+  MachineRegClass(const unsigned ID) : RegClassID(ID) { }
+
+
+};
+
+
+// include .h files that describes machine reg classes here
+
+#include "RegAlloc/Sparc/SparcIntRegClass.h"
+
+typedef vector<const MachineRegClass *> MachineRegClassArrayType;
+
+
+
+class MachineRegInfo
+{
+ private:
+
+  // A vector of all machine register classes
+  MachineRegClassArrayType MachineRegClassArr;
+
+
+ public:
+
+  MachineRegInfo() : MachineRegClassArr() { 
+
+    MachineRegClassArr.push_back( new SparcIntRegClass(0) );
+    // RegClassArr.pushback( new SparcFloatRegClass(1) );
+    // RegClassArr.pushback( new SparcFloatCCRegClass(2) );
+
+    if(DEBUG_RA)
+      cout << "Created machine register classes." << endl;
+
+  }
+
+
+  inline unsigned int getNumOfRegClasses() const { 
+    return MachineRegClassArr.size(); 
+  }  
+
+  unsigned getRegClassIDOfValue (const Value *const Val) const ;
+
+  const MachineRegClass *const getMachineRegClass(unsigned i) const { 
+    return MachineRegClassArr[i]; 
+  }
+
+  inline bool isCallInst(const MachineInstr *const MI) const {
+    MachineOpCode Op = MI->getOpCode();
+    return false; // ########################################
+    // return (Op == CALL || Op == JMPL);
+  }
+
+};
+
+
+// This function should detrmine the register class of a value. This can be 
+// done on type information in the value class. The register class returned 
+// must be same as  the array index of RegClassArr.
+
+unsigned MachineRegInfo::getRegClassIDOfValue (const Value *const Val) const
+{
+  
+  return 0;
+  
+}
+
+
+
+
+#endif
+