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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Assertion list |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__DECISION__ASSERTION_LIST_H |
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#define CVC5__DECISION__ASSERTION_LIST_H |
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#include <iosfwd> |
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#include <unordered_set> |
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#include <vector> |
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#include "context/cdlist.h" |
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#include "context/cdo.h" |
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#include "expr/node.h" |
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namespace cvc5 { |
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namespace decision { |
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/** |
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* For monitoring activity of assertions |
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*/ |
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enum class DecisionStatus |
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{ |
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// not currently watching status of the current assertion |
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INACTIVE, |
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// no decision was made considering the assertion |
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NO_DECISION, |
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// a decision was made considering the assertion |
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DECISION, |
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// we backtracked while considering the assertion |
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BACKTRACK |
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}; |
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const char* toString(DecisionStatus s); |
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std::ostream& operator<<(std::ostream& out, DecisionStatus s); |
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/** |
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* An assertion list used by the justification heuristic. This tracks a list |
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* of formulas that we must justify. |
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*/ |
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class AssertionList |
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{ |
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public: |
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/** |
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* @param ac The context on which the assertions depends on. This is the |
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* user context for assertions. It is the SAT context for assertions that |
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* are dynamically relevant based on what is asserted, e.g. lemmas |
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* corresponding to skolem definitions. |
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* @param ic The context on which the current index of the assertions |
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* depends on. This is typically the SAT context. |
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* @param dyn Whether to use a dynamic ordering of the assertions. If this |
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* flag is true, then getNextAssertion will return the most important next |
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* assertion to consider based on heuristics in response to notifyStatus. |
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*/ |
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AssertionList(context::Context* ac, |
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context::Context* ic, |
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bool useDyn = false); |
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virtual ~AssertionList() {} |
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/** Presolve, which clears the dynamic assertion order */ |
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void presolve(); |
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/** Add the assertion n */ |
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void addAssertion(TNode n); |
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/** |
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* Get the next assertion and increment d_assertionIndex. |
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*/ |
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TNode getNextAssertion(); |
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/** Get the number of assertions */ |
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size_t size() const; |
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/** |
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* Notify status, which indicates the status of the assertion n, where n |
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* is the assertion last returned by getNextAssertion above (independent of |
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* the context). The status s indicates what happened when we were trying to |
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* justify n. This impacts its order if useDyn is true. |
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*/ |
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void notifyStatus(TNode n, DecisionStatus s); |
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private: |
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/** The list of assertions */ |
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context::CDList<Node> d_assertions; |
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/** The index of the next assertion to satify */ |
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context::CDO<size_t> d_assertionIndex; |
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// --------------------------- dynamic assertions |
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/** are we using dynamic assertions? */ |
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bool d_usingDynamic; |
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/** The list of assertions */ |
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std::vector<TNode> d_dlist; |
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/** The set of assertions for fast membership testing in the above vector */ |
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std::unordered_set<TNode> d_dlistSet; |
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/** The index of the next assertion to satify */ |
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context::CDO<size_t> d_dindex; |
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}; |
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} // namespace decision |
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} // namespace cvc5 |
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#endif /* CVC5__DECISION__ASSERTION_LIST_H */ |