1 |
|
/****************************************************************************** |
2 |
|
* Top contributors (to current version): |
3 |
|
* Kshitij Bansal, Andrew Reynolds, Aina Niemetz |
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 |
|
* Decision engine. |
14 |
|
*/ |
15 |
|
|
16 |
|
#include "cvc5_private.h" |
17 |
|
|
18 |
|
#ifndef CVC5__DECISION__DECISION_ENGINE_H |
19 |
|
#define CVC5__DECISION__DECISION_ENGINE_H |
20 |
|
|
21 |
|
#include "expr/node.h" |
22 |
|
#include "prop/cnf_stream.h" |
23 |
|
#include "prop/sat_solver.h" |
24 |
|
#include "prop/sat_solver_types.h" |
25 |
|
#include "smt/env_obj.h" |
26 |
|
|
27 |
|
namespace cvc5 { |
28 |
|
namespace decision { |
29 |
|
|
30 |
|
class DecisionEngine : protected EnvObj |
31 |
|
{ |
32 |
|
public: |
33 |
|
/** Constructor */ |
34 |
|
DecisionEngine(Env& env); |
35 |
15335 |
virtual ~DecisionEngine() {} |
36 |
|
|
37 |
|
/** Finish initialize */ |
38 |
|
void finishInit(prop::CDCLTSatSolverInterface* ss, prop::CnfStream* cs); |
39 |
|
|
40 |
|
/** Presolve, called at the beginning of each check-sat call */ |
41 |
5852 |
virtual void presolve() {} |
42 |
|
|
43 |
|
/** |
44 |
|
* Gets the next decision based on strategies that are enabled. This sets |
45 |
|
* stopSearch to true if no further SAT variables need to be assigned in |
46 |
|
* this SAT context. |
47 |
|
*/ |
48 |
|
prop::SatLiteral getNext(bool& stopSearch); |
49 |
|
|
50 |
|
/** Is the DecisionEngine in a state where it has solved everything? */ |
51 |
|
virtual bool isDone() = 0; |
52 |
|
|
53 |
|
/** |
54 |
|
* Notify this class that assertion is an (input) assertion, not corresponding |
55 |
|
* to a skolem definition. |
56 |
|
*/ |
57 |
|
virtual void addAssertion(TNode assertion, bool isLemma) = 0; |
58 |
|
/** |
59 |
|
* Notify this class that lem is the skolem definition for skolem, which is |
60 |
|
* a part of the current assertions. |
61 |
|
*/ |
62 |
|
virtual void addSkolemDefinition(TNode lem, TNode skolem, bool isLemma) = 0; |
63 |
|
/** |
64 |
|
* Notify this class that the list of lemmas defs are now active in the |
65 |
|
* current SAT context. |
66 |
|
*/ |
67 |
|
virtual void notifyActiveSkolemDefs(std::vector<TNode>& defs) {} |
68 |
|
/** |
69 |
|
* Track active skolem defs, whether we need to call the above method |
70 |
|
* when appropriate. |
71 |
|
*/ |
72 |
2586 |
virtual bool needsActiveSkolemDefs() const { return false; } |
73 |
|
|
74 |
|
protected: |
75 |
|
/** Get next internal, the engine-specific implementation of getNext */ |
76 |
|
virtual prop::SatLiteral getNextInternal(bool& stopSearch) = 0; |
77 |
|
/** Pointer to the SAT context */ |
78 |
|
context::Context* d_context; |
79 |
|
/** Pointer to resource manager for associated SolverEngine */ |
80 |
|
ResourceManager* d_resourceManager; |
81 |
|
/** Pointer to the CNF stream */ |
82 |
|
prop::CnfStream* d_cnfStream; |
83 |
|
/** Pointer to the SAT solver */ |
84 |
|
prop::CDCLTSatSolverInterface* d_satSolver; |
85 |
|
}; |
86 |
|
|
87 |
|
/** |
88 |
|
* Instance of the above class which does nothing. This is used when |
89 |
|
* the decision mode is set to internal. |
90 |
|
*/ |
91 |
5158 |
class DecisionEngineEmpty : public DecisionEngine |
92 |
|
{ |
93 |
|
public: |
94 |
|
DecisionEngineEmpty(Env& env); |
95 |
|
bool isDone() override; |
96 |
|
void addAssertion(TNode assertion, bool isLemma) override; |
97 |
|
void addSkolemDefinition(TNode lem, TNode skolem, bool isLemma) override; |
98 |
|
|
99 |
|
protected: |
100 |
|
prop::SatLiteral getNextInternal(bool& stopSearch) override; |
101 |
|
}; |
102 |
|
|
103 |
|
} // namespace decision |
104 |
|
} // namespace cvc5 |
105 |
|
|
106 |
|
#endif /* CVC5__DECISION__DECISION_ENGINE_H */ |