| 1 | |
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| 2 | #ifndef __BDD_H__ |
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| 3 | #define __BDD_H__ |
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| 4 | |
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| 5 | #include <string> |
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| 6 | #include <iostream> |
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| 7 | #include <map> |
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| 8 | |
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| 9 | |
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| 10 | class Ebm; |
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| 11 | |
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| 12 | |
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| 13 | class Bdd { |
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| 14 | public: |
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| 15 | class Key { |
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| 16 | private: |
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| 17 | unsigned int _index; |
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| 18 | unsigned int _highIdent; |
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| 19 | unsigned int _lowIdent; |
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| 20 | public: |
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| 21 | inline Key ( unsigned int index, unsigned int high, unsigned int low ); |
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| 22 | friend bool operator< ( const Key& lhs, const Key& rhs ); |
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| 23 | }; |
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| 24 | private: |
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| 25 | static unsigned int _maxIdent; |
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| 26 | static unsigned int _maxStamp; |
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| 27 | static std::map<Key,Bdd*> _bdds; |
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| 28 | private: |
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| 29 | unsigned int _ident; // Unicity identifier. |
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| 30 | unsigned int _index; // Decomposition variable index. |
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| 31 | Bdd* _high; // Low cofactor pointer. |
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| 32 | Bdd* _low; // High cofactor pointer. |
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| 33 | unsigned _stamp; // Used to flag already reached nodes in the DAG recursive walktrhough. |
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| 34 | public: |
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| 35 | static Bdd* One; |
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| 36 | static Bdd* Zero; |
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| 37 | private: |
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| 38 | Bdd ( unsigned index, Bdd* high, Bdd* low ); |
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| 39 | ~Bdd (); |
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| 40 | public : |
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| 41 | static Bdd* create ( unsigned index, Bdd* high, Bdd* low ); |
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| 42 | static Bdd* apply ( Ebm::OperatorType, Bdd*, Bdd* ); |
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| 43 | static Bdd* Not ( Bdd* ); |
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| 44 | static Bdd* And ( Bdd*, Bdd* ); |
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| 45 | static Bdd* And ( Bdd*, Bdd*, Bdd* ); |
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| 46 | static Bdd* And ( Bdd*, Bdd*, Bdd*, Bdd* ); |
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| 47 | static Bdd* Xor ( Bdd*, Bdd* ); |
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| 48 | static Bdd* Xor ( Bdd*, Bdd*, Bdd* ); |
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| 49 | static Bdd* Xor ( Bdd*, Bdd*, Bdd*, Bdd* ); |
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| 50 | static Bdd* Or ( Bdd*, Bdd* ); |
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| 51 | static Bdd* Or ( Bdd*, Bdd*, Bdd* ); |
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| 52 | static Bdd* Or ( Bdd*, Bdd*, Bdd*, Bdd* ); |
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| 53 | public: |
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| 54 | inline unsigned getIdent (); |
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| 55 | inline unsigned getIndex (); |
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| 56 | inline Bdd* getHigh (); |
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| 57 | inline Bdd* getLow (); |
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| 58 | Bdd* neg (); |
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| 59 | unsigned int depth (); |
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| 60 | Bdd* satisfy (); |
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| 61 | void display ( std::ostream& ); |
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| 62 | void toDot ( const string& filename ); |
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| 63 | void toDot ( std::ostream& ); |
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| 64 | BoolValue eval (); |
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| 65 | Ebm* toEbm (); |
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| 66 | static Bdd* fromEbm ( Ebm* ); |
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| 67 | private: |
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| 68 | inline Key _getKey (); |
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| 69 | void _display ( std::ostream& ); |
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| 70 | void _toDot ( std::ostream& ); |
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| 71 | friend std::ostream& operator<< ( std::ostream&, const Bdd* ); |
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| 72 | }; |
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| 73 | |
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| 74 | |
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| 75 | // Bdd inline methods. |
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| 76 | inline unsigned int Bdd::getIdent () { return _ident; } |
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| 77 | inline unsigned int Bdd::getIndex () { return _index; } |
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| 78 | inline Bdd* Bdd::getHigh () { return _high; } |
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| 79 | inline Bdd* Bdd::getLow () { return _low; } |
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| 80 | |
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| 81 | inline Bdd::Key Bdd::_getKey () |
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| 82 | { |
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| 83 | return Key ( _index |
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| 84 | , (_high == NULL) ? 0 : _high->_index |
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| 85 | , (_low == NULL) ? 0 : _low ->_index ); |
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| 86 | } |
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| 87 | |
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| 88 | |
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| 89 | // Bdd::Key inline method. |
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| 90 | inline Bdd::Key::Key ( unsigned int index, unsigned int high, unsigned int low ) |
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| 91 | : _index (index) |
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| 92 | , _highIdent(high) |
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| 93 | , _lowIdent (low) |
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| 94 | { } |
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| 95 | |
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| 96 | |
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| 97 | inline bool operator< ( const Bdd::Key& lhs, const Bdd::Key& rhs ) |
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| 98 | { |
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| 99 | // Uses lexicographical order (_index,_lowId,_highId). |
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| 100 | if ( lhs._index != rhs._index ) |
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| 101 | return ( lhs._index < rhs._index ); |
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| 102 | |
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| 103 | if ( lhs._lowIdent != rhs._lowIdent ) |
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| 104 | return ( lhs._lowIdent < rhs._lowIdent ); |
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| 105 | |
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| 106 | return ( lhs._highIdent < rhs._highIdent ); |
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| 107 | } |
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| 108 | |
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| 109 | |
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| 110 | #endif // __BDD_H__ |
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