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/***********************************************************************************[SolverTypes.h]
MiniSat -- Copyright (c) 2003-2005, Niklas Een, Niklas Sorensson
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**************************************************************************************************/
#ifndef SolverTypes_h
#define SolverTypes_h
#include "Global.h"
namespace MINISAT {
//=================================================================================================
// Variables, literals, clause IDs:
// NOTE! Variables are just integers. No abstraction here. They should be chosen from 0..N,
// so that they can be used as array indices.
typedef int Var;
#define var_Undef (-1)
struct Lit {
int x;
Lit() : x(2*var_Undef) { } // (lit_Undef)
explicit Lit(Var var, bool sign = false) : x((var+var) + (int)sign) { }
};
// Don't use these for constructing/deconstructing literals. Use the normal constructors instead.
inline int toInt (Lit p) { return p.x; } // A "toInt" method that guarantees small, positive integers suitable for array indexing.
inline Lit toLit (int i) { Lit p; p.x = i; return p; } // Inverse of 'toInt()'
inline Lit operator ~(Lit p) { Lit q; q.x = p.x ^ 1; return q; }
inline bool sign (Lit p) { return p.x & 1; }
inline int var (Lit p) { return p.x >> 1; }
inline Lit unsign (Lit p) { Lit q; q.x = p.x & ~1; return q; }
inline Lit id (Lit p, bool sgn) { Lit q; q.x = p.x ^ (int)sgn; return q; }
inline bool operator == (Lit p, Lit q) { return toInt(p) == toInt(q); }
inline bool operator != (Lit p, Lit q) { return toInt(p) != toInt(q); }
inline bool operator < (Lit p, Lit q) { return toInt(p) < toInt(q); } // '<' guarantees that p, ~p are adjacent in the ordering.
const Lit lit_Undef(var_Undef, false); // }- Useful special constants.
const Lit lit_Error(var_Undef, true ); // }
//=================================================================================================
// Clause -- a simple class for representing a clause:
class Clause {
uint size_etc;
union { float act; uint abst; } apa;
Lit data[1];
public:
// NOTE: This constructor cannot be used directly (doesn't allocate enough memory).
template<class V>
Clause(const V& ps, bool learnt) {
size_etc = (ps.size() << 3) | (uint)learnt;
for (int i = 0; i < ps.size(); i++) data[i] = ps[i];
if (learnt) apa.act = 0; else apa.abst = 0; }
// -- use this function instead:
template<class V>
friend Clause* Clause_new(const V& ps, bool learnt = false) {
assert(sizeof(Lit) == sizeof(uint));
assert(sizeof(float) == sizeof(uint));
void* mem = xmalloc<char>(sizeof(Clause) +
sizeof(uint)*(ps.size() - 1));
return new (mem) Clause(ps, learnt); }
int size () const { return size_etc >> 3; }
void shrink (int i) { assert(i <= size()); size_etc = (((size_etc >> 3) - i) << 3) | (size_etc & 7); }
void pop () { shrink(1); }
bool learnt () const { return size_etc & 1; }
uint mark () const { return (size_etc >> 1) & 3; }
void mark (uint m) { size_etc = (size_etc & ~6) | ((m & 3) << 1); }
Lit operator [] (int i) const { return data[i]; }
Lit& operator [] (int i) { return data[i]; }
float& activity () { return apa.act; }
uint abstraction () const { return apa.abst; }
void calcAbstraction() {
uint abstraction = 0;
for (int i = 0; i < size(); i++)
abstraction |= 1 << (var(data[i]) & 31);
apa.abst = abstraction; }
};
//=================================================================================================
// TrailPos -- Stores an index into the trail as well as an approximation of a level. This data
// is recorded for each assigment. (Replaces the old level information)
class TrailPos {
int tp;
public:
explicit TrailPos(int index, int level) : tp( (index << 5) + (level & 31) ) { }
friend int abstractLevel(const TrailPos& p) { return 1 << (p.tp & 31); }
friend int position (const TrailPos& p) { return p.tp >> 5; }
bool operator == (TrailPos other) const { return tp == other.tp; }
bool operator < (TrailPos other) const { return tp < other.tp; }
};
}
#endif
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