Move bitunion code into it's own file.

--HG--
extra : convert_revision : 8d55ca9645ee4e357b7f4595435542eb72490331

1 files changed, 0 insertions, 269 deletions

diff --git a/src/base/bitfield.hh b/src/base/bitfield.hh
index 70a46386e..664093fa2 100644
--- a/src/base/bitfield.hh
+++ b/src/base/bitfield.hh
@@ -161,273 +161,4 @@ findMsbSet(uint64_t val) {
     return msb;
 }
 
-//	The following implements the BitUnion system of defining bitfields
-//on top of an underlying class. This is done through the pervasive use of
-//both named and unnamed unions which all contain the same actual storage.
-//Since they're unioned with each other, all of these storage locations
-//overlap. This allows all of the bitfields to manipulate the same data
-//without having to have access to each other. More details are provided with the
-//individual components.
-
-//This namespace is for classes which implement the backend of the BitUnion
-//stuff. Don't use any of these directly, except for the Bitfield classes in
-//the *BitfieldTypes class(es).
-namespace BitfieldBackend
-{
-    //A base class for all bitfields. It instantiates the actual storage,
-    //and provides getBits and setBits functions for manipulating it. The
-    //Data template parameter is type of the underlying storage.
-    template<class Data>
-    class BitfieldBase
-    {
-      protected:
-        Data __data;
-
-        //This function returns a range of bits from the underlying storage.
-        //It relies on the "bits" function above. It's the user's
-        //responsibility to make sure that there is a properly overloaded
-        //version of this function for whatever type they want to overlay.
-        inline uint64_t
-        getBits(int first, int last) const
-        {
-            return bits(__data, first, last);
-        }
-
-        //Similar to the above, but for settings bits with replaceBits.
-        inline void
-        setBits(int first, int last, uint64_t val)
-        {
-            replaceBits(__data, first, last, val);
-        }
-    };
-
-    //This class contains all the "regular" bitfield classes. It is inherited
-    //by all BitUnions which give them access to those types.
-    template<class Type>
-    class RegularBitfieldTypes
-    {
-      protected:
-        //This class implements ordinary bitfields, that is a span of bits
-        //who's msb is "first", and who's lsb is "last".
-        template<int first, int last=first>
-        class Bitfield : public BitfieldBase<Type>
-        {
-          public:
-            operator uint64_t () const
-            {
-                return this->getBits(first, last);
-            }
-
-            uint64_t
-            operator=(const uint64_t _data)
-            {
-                this->setBits(first, last, _data);
-                return _data;
-            }
-        };
-
-        //A class which specializes the above so that it can only be read
-        //from. This is accomplished explicitly making sure the assignment
-        //operator is blocked. The conversion operator is carried through
-        //inheritance. This will unfortunately need to be copied into each
-        //bitfield type due to limitations with how templates work
-        template<int first, int last=first>
-        class BitfieldRO : public Bitfield<first, last>
-        {
-          private:
-            uint64_t
-            operator=(const uint64_t _data);
-        };
-
-        //Similar to the above, but only allows writing.
-        template<int first, int last=first>
-        class BitfieldWO : public Bitfield<first, last>
-        {
-          private:
-            operator uint64_t () const;
-
-          public:
-            using Bitfield<first, last>::operator=;
-        };
-    };
-
-    //This class contains all the "regular" bitfield classes. It is inherited
-    //by all BitUnions which give them access to those types.
-    template<class Type>
-    class SignedBitfieldTypes
-    {
-      protected:
-        //This class implements ordinary bitfields, that is a span of bits
-        //who's msb is "first", and who's lsb is "last".
-        template<int first, int last=first>
-        class SignedBitfield : public BitfieldBase<Type>
-        {
-          public:
-            operator int64_t () const
-            {
-                return sext<first - last + 1>(this->getBits(first, last));
-            }
-
-            int64_t
-            operator=(const int64_t _data)
-            {
-                this->setBits(first, last, _data);
-                return _data;
-            }
-        };
-
-        //A class which specializes the above so that it can only be read
-        //from. This is accomplished explicitly making sure the assignment
-        //operator is blocked. The conversion operator is carried through
-        //inheritance. This will unfortunately need to be copied into each
-        //bitfield type due to limitations with how templates work
-        template<int first, int last=first>
-        class SignedBitfieldRO : public SignedBitfield<first, last>
-        {
-          private:
-            int64_t
-            operator=(const int64_t _data);
-        };
-
-        //Similar to the above, but only allows writing.
-        template<int first, int last=first>
-        class SignedBitfieldWO : public SignedBitfield<first, last>
-        {
-          private:
-            operator int64_t () const;
-
-          public:
-            int64_t operator=(const int64_t _data)
-            {
-                *((SignedBitfield<first, last> *)this) = _data;
-                return _data;
-            }
-        };
-    };
-
-    template<class Type>
-    class BitfieldTypes : public RegularBitfieldTypes<Type>,
-                          public SignedBitfieldTypes<Type>
-    {};
-
-    //When a BitUnion is set up, an underlying class is created which holds
-    //the actual union. This class then inherits from it, and provids the
-    //implementations for various operators. Setting things up this way
-    //prevents having to redefine these functions in every different BitUnion
-    //type. More operators could be implemented in the future, as the need
-    //arises.
-    template <class Type, class Base>
-    class BitUnionOperators : public Base
-    {
-      public:
-        operator Type () const
-        {
-            return Base::__data;
-        }
-
-        Type
-        operator=(const Type & _data)
-        {
-            Base::__data = _data;
-            return _data;
-        }
-
-        bool
-        operator<(const Base & base) const
-        {
-            return Base::__data < base.__data;
-        }
-
-        bool
-        operator==(const Base & base) const
-        {
-            return Base::__data == base.__data;
-        }
-    };
-}
-
-//This macro is a backend for other macros that specialize it slightly.
-//First, it creates/extends a namespace "BitfieldUnderlyingClasses" and
-//sticks the class which has the actual union in it, which
-//BitfieldOperators above inherits from. Putting these classes in a special
-//namespace ensures that there will be no collisions with other names as long
-//as the BitUnion names themselves are all distinct and nothing else uses
-//the BitfieldUnderlyingClasses namespace, which is unlikely. The class itself
-//creates a typedef of the "type" parameter called __DataType. This allows
-//the type to propagate outside of the macro itself in a controlled way.
-//Finally, the base storage is defined which BitfieldOperators will refer to
-//in the operators it defines. This macro is intended to be followed by
-//bitfield definitions which will end up inside it's union. As explained
-//above, these is overlayed the __data member in its entirety by each of the
-//bitfields which are defined in the union, creating shared storage with no
-//overhead.
-#define __BitUnion(type, name) \
-    namespace BitfieldUnderlyingClasses \
-    { \
-        class name; \
-    } \
-    class BitfieldUnderlyingClasses::name : \
-        public BitfieldBackend::BitfieldTypes<type> \
-    { \
-      public: \
-        typedef type __DataType; \
-        union { \
-            type __data;\
-
-//This closes off the class and union started by the above macro. It is
-//followed by a typedef which makes "name" refer to a BitfieldOperator
-//class inheriting from the class and union just defined, which completes
-//building up the type for the user.
-#define EndBitUnion(name) \
-        }; \
-    }; \
-    typedef BitfieldBackend::BitUnionOperators< \
-        BitfieldUnderlyingClasses::name::__DataType, \
-        BitfieldUnderlyingClasses::name> name;
-
-//This sets up a bitfield which has other bitfields nested inside of it. The
-//__data member functions like the "underlying storage" of the top level
-//BitUnion. Like everything else, it overlays with the top level storage, so
-//making it a regular bitfield type makes the entire thing function as a
-//regular bitfield when referred to by itself.
-#define __SubBitUnion(fieldType, first, last, name) \
-    class : public BitfieldBackend::BitfieldTypes<__DataType> \
-    { \
-      public: \
-        union { \
-            fieldType<first, last> __data;
-
-//This closes off the union created above and gives it a name. Unlike the top
-//level BitUnion, we're interested in creating an object instead of a type.
-//The operators are defined in the macro itself instead of a class for
-//technical reasons. If someone determines a way to move them to one, please
-//do so.
-#define EndSubBitUnion(name) \
-        }; \
-        inline operator const __DataType () \
-        { return __data; } \
-        \
-        inline const __DataType operator = (const __DataType & _data) \
-        { __data = _data; } \
-    } name;
-
-//Regular bitfields
-//These define macros for read/write regular bitfield based subbitfields.
-#define SubBitUnion(name, first, last) \
-    __SubBitUnion(Bitfield, first, last, name)
-
-//Regular bitfields
-//These define macros for read/write regular bitfield based subbitfields.
-#define SignedSubBitUnion(name, first, last) \
-    __SubBitUnion(SignedBitfield, first, last, name)
-
-//Use this to define an arbitrary type overlayed with bitfields.
-#define BitUnion(type, name) __BitUnion(type, name)
-
-//Use this to define conveniently sized values overlayed with bitfields.
-#define BitUnion64(name) __BitUnion(uint64_t, name)
-#define BitUnion32(name) __BitUnion(uint32_t, name)
-#define BitUnion16(name) __BitUnion(uint16_t, name)
-#define BitUnion8(name) __BitUnion(uint8_t, name)
-
 #endif // __BASE_BITFIELD_HH__