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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/prop/sat_solver.h	Lines:	4	38	10.5 %
Date:	2021-11-06	Branches:	0	30	0.0 %


/******************************************************************************
 * Top contributors (to current version):
 *   Dejan Jovanovic, Liana Hadarean, Mathias Preiner
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
 * in the top-level source directory and their institutional affiliations.
 * All rights reserved.  See the file COPYING in the top-level source
 * directory for licensing information.
 * ****************************************************************************
 *
 * SAT Solver.
 */

#include "cvc5_private.h"

#ifndef CVC5__PROP__SAT_SOLVER_H
#define CVC5__PROP__SAT_SOLVER_H

#include <string>

#include "context/cdlist.h"
#include "context/context.h"
#include "expr/node.h"
#include "proof/clause_id.h"
#include "proof/proof_node_manager.h"
#include "prop/sat_solver_types.h"
#include "util/statistics_stats.h"

namespace cvc5 {

namespace prop {

class TheoryProxy;

class SatSolver {

public:

  /** Virtual destructor */
  virtual ~SatSolver() { }

  /** Assert a clause in the solver. */
  virtual ClauseId addClause(SatClause& clause,
                             bool removable) = 0;

  /** Return true if the solver supports native xor resoning */
  virtual bool nativeXor() { return false; }

  /** Add a clause corresponding to rhs = l1 xor .. xor ln  */
  virtual ClauseId addXorClause(SatClause& clause, bool rhs, bool removable) = 0;

  /**
   * Create a new boolean variable in the solver.
   * @param isTheoryAtom is this a theory atom that needs to be asserted to theory
   * @param preRegister whether to preregister the atom with the theory
   * @param canErase whether the sat solver can safely eliminate this variable
   *
   */
  virtual SatVariable newVar(bool isTheoryAtom, bool preRegister, bool canErase) = 0;

  /** Create a new (or return an existing) boolean variable representing the constant true */
  virtual SatVariable trueVar() = 0;

  /** Create a new (or return an existing) boolean variable representing the constant false */
  virtual SatVariable falseVar() = 0;

  /** Check the satisfiability of the added clauses */
  virtual SatValue solve() = 0;

  /** Check the satisfiability of the added clauses */
  virtual SatValue solve(long unsigned int&) = 0;

  /** Check satisfiability under assumptions */
  virtual SatValue solve(const std::vector<SatLiteral>& assumptions)
  {
    Unimplemented() << "Solving under assumptions not implemented";
    return SAT_VALUE_UNKNOWN;
  };

  /**
   * Tell SAT solver to only do propagation on next solve().
   *
   * @return true if feature is supported, otherwise false.
   */
  virtual bool setPropagateOnly() { return false; }

  /** Interrupt the solver */
  virtual void interrupt() = 0;

  /** Call value() during the search.*/
  virtual SatValue value(SatLiteral l) = 0;

  /** Call modelValue() when the search is done.*/
  virtual SatValue modelValue(SatLiteral l) = 0;

  /** Get the current assertion level */
  virtual unsigned getAssertionLevel() const = 0;

  /** Check if the solver is in an inconsistent state */
  virtual bool ok() const = 0;

  /**
   * Get list of unsatisfiable assumptions.
   *
   * The returned assumptions are a subset of the assumptions provided to
   * the solve method.
   * Can only be called if satisfiability check under assumptions was used and
   * if it returned SAT_VALUE_FALSE.
   */
  virtual void getUnsatAssumptions(std::vector<SatLiteral>& unsat_assumptions)
  {
    Unimplemented() << "getUnsatAssumptions not implemented";
  }

};/* class SatSolver */


class CDCLTSatSolverInterface : public SatSolver
{
 public:
  virtual ~CDCLTSatSolverInterface(){};

  virtual void initialize(context::Context* context,
                          prop::TheoryProxy* theoryProxy,
                          cvc5::context::UserContext* userContext,
                          ProofNodeManager* pnm) = 0;

  virtual void push() = 0;

  virtual void pop() = 0;

  /*
   * Reset the decisions in the DPLL(T) SAT solver at the current assertion
   * level.
   */
  virtual void resetTrail() = 0;

  virtual bool properExplanation(SatLiteral lit, SatLiteral expl) const = 0;

  virtual void requirePhase(SatLiteral lit) = 0;

  virtual bool isDecision(SatVariable decn) const = 0;

  /**
   * Return the current decision level of `lit`.
   */
  virtual int32_t getDecisionLevel(SatVariable v) const { return -1; }

  /**
   * Return the user-context level when `lit` was introduced..
   */
  virtual int32_t getIntroLevel(SatVariable v) const { return -1; }

  virtual std::shared_ptr<ProofNode> getProof() = 0;

}; /* class CDCLTSatSolverInterface */

inline std::ostream& operator <<(std::ostream& out, prop::SatLiteral lit) {
  out << lit.toString();
  return out;
}

inline std::ostream& operator <<(std::ostream& out, const prop::SatClause& clause) {
  out << "clause:";
  for(unsigned i = 0; i < clause.size(); ++i) {
    out << " " << clause[i];
  }
  out << ";";
  return out;
}

inline std::ostream& operator <<(std::ostream& out, prop::SatValue val) {
  std::string str;
  switch(val) {
  case prop::SAT_VALUE_UNKNOWN:
    str = "_";
    break;
  case prop::SAT_VALUE_TRUE:
    str = "1";
    break;
  case prop::SAT_VALUE_FALSE:
    str = "0";
    break;
  default:
    str = "Error";
    break;
  }

  out << str;
  return out;
}

}  // namespace prop
}  // namespace cvc5

#endif /* CVC5__PROP__SAT_MODULE_H */


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Dejan Jovanovic, Liana Hadarean, Mathias Preiner
4		*
5		* This file is part of the cvc5 project.
6		*
7		* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
8		* in the top-level source directory and their institutional affiliations.
9		* All rights reserved. See the file COPYING in the top-level source
10		* directory for licensing information.
11		* ****************************************************************************
12		*
13		* SAT Solver.
14		*/
15
16		#include "cvc5_private.h"
17
18		#ifndef CVC5__PROP__SAT_SOLVER_H
19		#define CVC5__PROP__SAT_SOLVER_H
20
21		#include <string>
22
23		#include "context/cdlist.h"
24		#include "context/context.h"
25		#include "expr/node.h"
26		#include "proof/clause_id.h"
27		#include "proof/proof_node_manager.h"
28		#include "prop/sat_solver_types.h"
29		#include "util/statistics_stats.h"
30
31		namespace cvc5 {
32
33		namespace prop {
34
35		class TheoryProxy;
36
37	22653	class SatSolver {
38
39		public:
40
41		/** Virtual destructor */
42	22643	virtual ~SatSolver() { }
43
44		/** Assert a clause in the solver. */
45		virtual ClauseId addClause(SatClause& clause,
46		bool removable) = 0;
47
48		/** Return true if the solver supports native xor resoning */
49		virtual bool nativeXor() { return false; }
50
51		/** Add a clause corresponding to rhs = l1 xor .. xor ln */
52		virtual ClauseId addXorClause(SatClause& clause, bool rhs, bool removable) = 0;
53
54		/**
55		* Create a new boolean variable in the solver.
56		* @param isTheoryAtom is this a theory atom that needs to be asserted to theory
57		* @param preRegister whether to preregister the atom with the theory
58		* @param canErase whether the sat solver can safely eliminate this variable
59		*
60		*/
61		virtual SatVariable newVar(bool isTheoryAtom, bool preRegister, bool canErase) = 0;
62
63		/** Create a new (or return an existing) boolean variable representing the constant true */
64		virtual SatVariable trueVar() = 0;
65
66		/** Create a new (or return an existing) boolean variable representing the constant false */
67		virtual SatVariable falseVar() = 0;
68
69		/** Check the satisfiability of the added clauses */
70		virtual SatValue solve() = 0;
71
72		/** Check the satisfiability of the added clauses */
73		virtual SatValue solve(long unsigned int&) = 0;
74
75		/** Check satisfiability under assumptions */
76		virtual SatValue solve(const std::vector<SatLiteral>& assumptions)
77		{
78		Unimplemented() << "Solving under assumptions not implemented";
79		return SAT_VALUE_UNKNOWN;
80		};
81
82		/**
83		* Tell SAT solver to only do propagation on next solve().
84		*
85		* @return true if feature is supported, otherwise false.
86		*/
87		virtual bool setPropagateOnly() { return false; }
88
89		/** Interrupt the solver */
90		virtual void interrupt() = 0;
91
92		/** Call value() during the search.*/
93		virtual SatValue value(SatLiteral l) = 0;
94
95		/** Call modelValue() when the search is done.*/
96		virtual SatValue modelValue(SatLiteral l) = 0;
97
98		/** Get the current assertion level */
99		virtual unsigned getAssertionLevel() const = 0;
100
101		/** Check if the solver is in an inconsistent state */
102		virtual bool ok() const = 0;
103
104		/**
105		* Get list of unsatisfiable assumptions.
106		*
107		* The returned assumptions are a subset of the assumptions provided to
108		* the solve method.
109		* Can only be called if satisfiability check under assumptions was used and
110		* if it returned SAT_VALUE_FALSE.
111		*/
112		virtual void getUnsatAssumptions(std::vector<SatLiteral>& unsat_assumptions)
113		{
114		Unimplemented() << "getUnsatAssumptions not implemented";
115		}
116
117		};/* class SatSolver */
118
119
120	15339	class CDCLTSatSolverInterface : public SatSolver
121		{
122		public:
123	15334	virtual ~CDCLTSatSolverInterface(){};
124
125		virtual void initialize(context::Context* context,
126		prop::TheoryProxy* theoryProxy,
127		cvc5::context::UserContext* userContext,
128		ProofNodeManager* pnm) = 0;
129
130		virtual void push() = 0;
131
132		virtual void pop() = 0;
133
134		/*
135		* Reset the decisions in the DPLL(T) SAT solver at the current assertion
136		* level.
137		*/
138		virtual void resetTrail() = 0;
139
140		virtual bool properExplanation(SatLiteral lit, SatLiteral expl) const = 0;
141
142		virtual void requirePhase(SatLiteral lit) = 0;
143
144		virtual bool isDecision(SatVariable decn) const = 0;
145
146		/**
147		* Return the current decision level of `lit`.
148		*/
149		virtual int32_t getDecisionLevel(SatVariable v) const { return -1; }
150
151		/**
152		* Return the user-context level when `lit` was introduced..
153		*/
154		virtual int32_t getIntroLevel(SatVariable v) const { return -1; }
155
156		virtual std::shared_ptr<ProofNode> getProof() = 0;
157
158		}; /* class CDCLTSatSolverInterface */
159
160		inline std::ostream& operator <<(std::ostream& out, prop::SatLiteral lit) {
161		out << lit.toString();
162		return out;
163		}
164
165		inline std::ostream& operator <<(std::ostream& out, const prop::SatClause& clause) {
166		out << "clause:";
167		for(unsigned i = 0; i < clause.size(); ++i) {
168		out << " " << clause[i];
169		}
170		out << ";";
171		return out;
172		}
173
174		inline std::ostream& operator <<(std::ostream& out, prop::SatValue val) {
175		std::string str;
176		switch(val) {
177		case prop::SAT_VALUE_UNKNOWN:
178		str = "_";
179		break;
180		case prop::SAT_VALUE_TRUE:
181		str = "1";
182		break;
183		case prop::SAT_VALUE_FALSE:
184		str = "0";
185		break;
186		default:
187		str = "Error";
188		break;
189		}
190
191		out << str;
192		return out;
193		}
194
195		} // namespace prop
196		} // namespace cvc5
197
198		#endif /* CVC5__PROP__SAT_MODULE_H */