bitunion.hh (10640:edbc52a43cd8) bitunion.hh (11294:a368064a2ab5)
1/*
2 * Copyright (c) 2007-2008 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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84 //who's msb is "first", and who's lsb is "last".
85 template<int first, int last=first>
86 class Bitfield : public BitfieldBase<Type>
87 {
88 static_assert(first >= last,
89 "Bitfield ranges must be specified as <msb, lsb>");
90
91 public:
1/*
2 * Copyright (c) 2007-2008 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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84 //who's msb is "first", and who's lsb is "last".
85 template<int first, int last=first>
86 class Bitfield : public BitfieldBase<Type>
87 {
88 static_assert(first >= last,
89 "Bitfield ranges must be specified as <msb, lsb>");
90
91 public:
92 operator const uint64_t () const
92 operator uint64_t () const
93 {
94 return this->getBits(first, last);
95 }
96
97 uint64_t
98 operator=(const uint64_t _data)
99 {
100 this->setBits(first, last, _data);

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124 operator=(const Bitfield<first, last>& other);
125 };
126
127 //Similar to the above, but only allows writing.
128 template<int first, int last=first>
129 class BitfieldWO : public Bitfield<first, last>
130 {
131 private:
93 {
94 return this->getBits(first, last);
95 }
96
97 uint64_t
98 operator=(const uint64_t _data)
99 {
100 this->setBits(first, last, _data);

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124 operator=(const Bitfield<first, last>& other);
125 };
126
127 //Similar to the above, but only allows writing.
128 template<int first, int last=first>
129 class BitfieldWO : public Bitfield<first, last>
130 {
131 private:
132 operator const uint64_t () const;
132 operator uint64_t () const;
133
134 public:
135 using Bitfield<first, last>::operator=;
136 };
137 };
138
139 //This class contains all the "regular" bitfield classes. It is inherited
140 //by all BitUnions which give them access to those types.
141 template<class Type>
142 class SignedBitfieldTypes
143 {
144 protected:
145 //This class implements ordinary bitfields, that is a span of bits
146 //who's msb is "first", and who's lsb is "last".
147 template<int first, int last=first>
148 class SignedBitfield : public BitfieldBase<Type>
149 {
150 public:
133
134 public:
135 using Bitfield<first, last>::operator=;
136 };
137 };
138
139 //This class contains all the "regular" bitfield classes. It is inherited
140 //by all BitUnions which give them access to those types.
141 template<class Type>
142 class SignedBitfieldTypes
143 {
144 protected:
145 //This class implements ordinary bitfields, that is a span of bits
146 //who's msb is "first", and who's lsb is "last".
147 template<int first, int last=first>
148 class SignedBitfield : public BitfieldBase<Type>
149 {
150 public:
151 operator const int64_t () const
151 operator int64_t () const
152 {
153 return sext<first - last + 1>(this->getBits(first, last));
154 }
155
156 int64_t
157 operator=(const int64_t _data)
158 {
159 this->setBits(first, last, _data);

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183 operator=(const SignedBitfield<first, last>& other);
184 };
185
186 //Similar to the above, but only allows writing.
187 template<int first, int last=first>
188 class SignedBitfieldWO : public SignedBitfield<first, last>
189 {
190 private:
152 {
153 return sext<first - last + 1>(this->getBits(first, last));
154 }
155
156 int64_t
157 operator=(const int64_t _data)
158 {
159 this->setBits(first, last, _data);

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183 operator=(const SignedBitfield<first, last>& other);
184 };
185
186 //Similar to the above, but only allows writing.
187 template<int first, int last=first>
188 class SignedBitfieldWO : public SignedBitfield<first, last>
189 {
190 private:
191 operator const int64_t () const;
191 operator int64_t () const;
192
193 public:
194 using SignedBitfield<first, last>::operator=;
195 };
196 };
197
198 template<class Type>
199 class BitfieldTypes : public RegularBitfieldTypes<Type>,

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299
300//This closes off the union created above and gives it a name. Unlike the top
301//level BitUnion, we're interested in creating an object instead of a type.
302//The operators are defined in the macro itself instead of a class for
303//technical reasons. If someone determines a way to move them to one, please
304//do so.
305#define EndSubBitUnion(name) \
306 }; \
192
193 public:
194 using SignedBitfield<first, last>::operator=;
195 };
196 };
197
198 template<class Type>
199 class BitfieldTypes : public RegularBitfieldTypes<Type>,

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299
300//This closes off the union created above and gives it a name. Unlike the top
301//level BitUnion, we're interested in creating an object instead of a type.
302//The operators are defined in the macro itself instead of a class for
303//technical reasons. If someone determines a way to move them to one, please
304//do so.
305#define EndSubBitUnion(name) \
306 }; \
307 inline operator const __DataType () const \
307 inline operator __DataType () const \
308 { return __data; } \
309 \
308 { return __data; } \
309 \
310 inline const __DataType operator = (const __DataType & _data) \
310 inline __DataType operator = (const __DataType & _data) \
311 { return __data = _data;} \
312 } name;
313
314//Regular bitfields
315//These define macros for read/write regular bitfield based subbitfields.
316#define SubBitUnion(name, first, last) \
317 __SubBitUnion(Bitfield, first, last, name)
318

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312 } name;
313
314//Regular bitfields
315//These define macros for read/write regular bitfield based subbitfields.
316#define SubBitUnion(name, first, last) \
317 __SubBitUnion(Bitfield, first, last, name)
318

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