CVC3::SearchSat Class Reference
[Search Engine]

Search engine that connects to a generic SAT reasoning module. More...

#include <search_sat.h>

Inheritance diagram for CVC3::SearchSat:

[legend]Collaboration diagram for CVC3::SearchSat:

[legend]List of all members.

Public Member Functions

• SearchSat (TheoryCore *core, const std::string &name)
• virtual ~SearchSat ()

  Destructor.
  

• virtual const std::string & getName ()

  Name of this search engine.
  

• virtual void registerAtom (const Expr &e)

  Register an atomic formula of interest.
  

• virtual Theorem getImpliedLiteral ()

  Return next literal implied by last assertion. Null Expr if none.
  

• virtual void push ()

  Push a checkpoint.
  

• virtual void pop ()

  Restore last checkpoint.
  

• virtual QueryResult checkValid (const Expr &e, Theorem &result)

  Checks the validity of a formula in the current context.
  

• virtual QueryResult restart (const Expr &e, Theorem &result)

  Reruns last check with e as an additional assumption.
  

• virtual void returnFromCheck ()

  Returns to context immediately before last call to checkValid.
  

• virtual Theorem lastThm ()

  Returns the result of the most recent valid theorem.
  

• virtual Theorem newUserAssumption (const Expr &e)

  Generate and add an assumption to the set of assumptions in the current context.
  

• virtual void getUserAssumptions (std::vector< Expr > &assumptions)

  Get all user assumptions made in this and all previous contexts.
  

• virtual void getInternalAssumptions (std::vector< Expr > &assumptions)

  Get assumptions made internally in this and all previous contexts.
  

• virtual void getAssumptions (std::vector< Expr > &assumptions)

  Get all assumptions made in this and all previous contexts.
  

• virtual bool isAssumption (const Expr &e)

  Check if the formula has already been assumed previously.
  

• virtual void getCounterExample (std::vector< Expr > &assertions, bool inOrder=true)

  Will return the set of assertions which make the queried formula false.
  

• virtual Proof getProof ()

  Returns the proof term for the last proven query.
  

• virtual FormulaValue getValue (const CVC3::Expr &e)

Private Member Functions

• void restorePre ()

  Get rid of bottom scope entries in prioritySet.
  

• void restore ()

  Get rid of entries in prioritySet and pendingLemmas added since last push.
  

• bool recordNewRootLit (SAT::Lit lit, int priority=0, bool atBottomScope=false)

  Helper for addLemma and check.
  

• void addLemma (const Theorem &thm, int priority=0, bool atBotomScope=false)

  Core theory callback which adds a new lemma from the core theory.
  

• int getBottomScope ()

  Core theory callback which asks for the bottom scope for current query.
  

• void addSplitter (const Expr &e, int priority)

  Core theory callback which suggests a splitter.
  

• void assertLit (SAT::Lit l)

  DPLLT callback to inform theory that a literal has been assigned.
  

• SAT::DPLLT::ConsistentResult checkConsistent (SAT::CNF_Formula &cnf, bool fullEffort)

  DPLLT callback to ask if theory has detected inconsistency.
  

• SAT::Lit getImplication ()

  DPLLT callback to get theory propagations.
  

• void getExplanation (SAT::Lit l, SAT::CNF_Formula &cnf)

  DPLLT callback to explain a theory propagation.
  

• bool getNewClauses (SAT::CNF_Formula &cnf)

  DPLLT callback to get more general theory clauses.
  

• SAT::Lit makeDecision ()

  DPLLT callback to decide which literal to split on next.
  

• bool findSplitterRec (SAT::Lit lit, SAT::Var::Val value, SAT::Lit *litDecision)

  Recursively traverse DAG looking for a splitter.
  

• SAT::Var::Val getValue (SAT::Lit c)

  Get the value of a CNF Literal.
  

• SAT::Var::Val getValue (SAT::Var v)
• void setValue (SAT::Var v, SAT::Var::Val val)

  Set the value of a variable.
  

• bool checkJustified (SAT::Var v)

  Check whether this variable's value is justified.
  

• void setJustified (SAT::Var v)

  Mark this variable as justified.
  

• QueryResult check (const Expr &e, Theorem &result, bool isRestart=false)

  Main checking procedure shared by checkValid and restart.
  

• void newUserAssumptionIntHelper (const Theorem &thm, SAT::CNF_Formula_Impl &cnf, bool atBottomScope)

  Helper for newUserAssumptionInt.
  

• Theorem newUserAssumptionInt (const Expr &e, SAT::CNF_Formula_Impl &cnf, bool atBottomScope)

  Helper for newUserAssumption.
  

Private Attributes

• std::string d_name

  Name of search engine.
  

• CDO< int > d_bottomScope

  Bottom scope for current query.
  

• CDO< Expr > d_lastCheck

  Last expr checked for validity.
  

• CDO< Theorem > d_lastValid

  Theorem from the last successful checkValid call. It is used by getProof and getAssumptions.
  

• CDList< Theorem > d_userAssumptions

  List of all user assumptions.
  

• CDList< Theorem > d_intAssumptions

  List of all internal assumptions.
  

• CDO< unsigned > d_idxUserAssump

  Index to where unprocessed assumptions start.
  

• TheoryCore::CoreSatAPI * d_coreSatAPI
• SAT::DPLLT * d_dpllt

  Pointer to DPLLT implementation.
  

• SAT::DPLLT::TheoryAPI * d_theoryAPI

  Implementation of TheoryAPI for DPLLT.
  

• SAT::DPLLT::Decider * d_decider

  Implementation of Decider for DPLLT.
  

• CDMap< Expr, Theorem > d_theorems

  Store of theorems for expressions sent to DPLLT.
  

• SAT::CNF_Manager * d_cnfManager

  Manages CNF formula and its relationship to original Exprs and Theorems.
  

• SAT::CNF_Manager::CNFCallback * d_cnfCallback

  Callback for CNF_Manager.
  

• std::vector< SAT::Var::Val > d_vars

  Cached values of variables.
  

• bool d_inCheckSat

  Whether we are currently in a call to dpllt->checkSat.
  

• SAT::CD_CNF_Formula d_lemmas

  CNF Formula used for theory lemmas.
  

• std::vector< std::pair< Theorem,
  int > > d_pendingLemmas

  Lemmas waiting to be translated since last call to getNewClauses().
  

• std::vector< bool > d_pendingScopes

  Scope parameter for lemmas waiting to be translated since last call to getNewClauses().
  

• CDO< unsigned > d_pendingLemmasSize

  Backtracking size of d_pendingLemmas.
  

• CDO< unsigned > d_pendingLemmasNext

  Backtracking next item in d_pendingLemmas.
  

• CDO< unsigned > d_lemmasNext

  Current position in d_lemmas.
  

• std::vector< unsigned > d_varsUndoList

  List for backtracking var values.
  

• CDO< unsigned > d_varsUndoListSize

  Backtracking size of d_varsUndoList.
  

• std::set< LitPriorityPair > d_prioritySet

  Used to determine order to find splitters.
  

• CDO< std::set< LitPriorityPair
  >::const_iterator > d_prioritySetStart

  Current position in prioritySet.
  

• CDO< unsigned > d_prioritySetEntriesSize

  Backtracking size of priority set entries.
  

• std::vector< std::set< LitPriorityPair
  >::iterator > d_prioritySetEntries

  Entries in priority set in insertion order (so set can be backtracked).
  

• std::vector< unsigned > d_prioritySetBottomEntriesSizeStack

  Backtracking size of priority set entries at bottom scope.
  

• unsigned d_prioritySetBottomEntriesSize

  Current size of bottom entries.
  

• std::vector< std::set< LitPriorityPair
  >::iterator > d_prioritySetBottomEntries

  Entries in priority set in insertion order (so set can be backtracked).
  

• CDO< unsigned > d_lastRegisteredVar

  Last Var registered with core theory.
  

• CDO< bool > d_dplltReady

  Whether it's OK to call DPLLT solver from the current scope.
  

• CDO< unsigned > d_nextImpliedLiteral
• Restorer d_restorer

  Instance of Restorer class.
  

Friends

• class Restorer

  Helper class for resetting DPLLT engine.
  

• class SearchSatCoreSatAPI
• class SearchSatCNFCallback
• class SearchSatTheoryAPI
• class SearchSatDecider

Classes

• class LitPriorityPair

  Pair of Lit and priority of this Lit. More...
  

• class Restorer

---

Detailed Description

Search engine that connects to a generic SAT reasoning module.

Definition at line 40 of file search_sat.h.

---

Constructor & Destructor Documentation

SearchSat::SearchSat	(	TheoryCore *	core,
		const std::string &	name
	)

Constructor name is the name of the dpllt engine to use, as returned by getName()

Definition at line 935 of file search_sat.cpp.

References d_cnfCallback, d_cnfManager, d_coreSatAPI, d_decider, d_dpllt, d_prioritySet, d_prioritySetStart, d_theoryAPI, CVC3::TheoryCore::getCM(), CVC3::TheoryCore::getFlags(), CVC3::TheoryCore::getStatistics(), CVC3::TheoryCore::getTM(), SAT::CNF_Manager::registerCNFCallback(), CVC3::TheoryCore::registerCoreSatAPI(), SearchSatCNFCallback, SearchSatCoreSatAPI, SearchSatDecider, SearchSatTheoryAPI, and CVC3::TheoremManager::withProof().

SearchSat::~SearchSat

(

)

[virtual]

Destructor.

Definition at line 990 of file search_sat.cpp.

References d_cnfCallback, d_cnfManager, d_coreSatAPI, d_decider, d_dpllt, and d_theoryAPI.

---

Member Function Documentation

void SearchSat::restorePre

(

)

[private]

Get rid of bottom scope entries in prioritySet.

Definition at line 115 of file search_sat.cpp.

References d_bottomScope, CVC3::SearchEngine::d_core, d_prioritySet, d_prioritySetBottomEntries, d_prioritySetBottomEntriesSize, d_prioritySetBottomEntriesSizeStack, DebugAssert, CVC3::TheoryCore::getCM(), and CVC3::ContextManager::scopeLevel().

Referenced by CVC3::SearchSat::Restorer::notifyPre().

void SearchSat::restore

(

)

[private]

Get rid of entries in prioritySet and pendingLemmas added since last push.

Definition at line 129 of file search_sat.cpp.

References d_pendingLemmas, d_pendingLemmasSize, d_pendingScopes, d_prioritySet, d_prioritySetEntries, d_prioritySetEntriesSize, d_vars, d_varsUndoList, d_varsUndoListSize, and SAT::Var::UNKNOWN.

Referenced by CVC3::SearchSat::Restorer::notify().

bool SearchSat::recordNewRootLit	(	SAT::Lit	lit,
		int	priority = 0,
		bool	atBottomScope = false
	)			[private]

Helper for addLemma and check.

Definition at line 146 of file search_sat.cpp.

References d_bottomScope, CVC3::SearchEngine::d_core, d_prioritySet, d_prioritySetBottomEntries, d_prioritySetBottomEntriesSize, d_prioritySetEntries, d_prioritySetEntriesSize, d_prioritySetStart, DebugAssert, CVC3::CDO< T >::get(), CVC3::TheoryCore::getCM(), and CVC3::ContextManager::scopeLevel().

Referenced by getNewClauses(), and newUserAssumptionIntHelper().

void SearchSat::addLemma	(	const Theorem &	thm,
		int	priority = 0,
		bool	atBotomScope = false
	)			[private]

Core theory callback which adds a new lemma from the core theory.

Definition at line 170 of file search_sat.cpp.

References d_pendingLemmas, d_pendingLemmasNext, d_pendingLemmasSize, d_pendingScopes, DebugAssert, CVC3::Theorem::getExpr(), IF_DEBUG, CVC3::PRESENTATION_LANG, CVC3::SearchEngine::theoryCore(), CVC3::Expr::toString(), and CVC3::TRACE.

Referenced by CVC3::SearchSatCoreSatAPI::addLemma(), and addSplitter().

int CVC3::SearchSat::getBottomScope

(

)

[inline, private]

Core theory callback which asks for the bottom scope for current query.

Definition at line 184 of file search_sat.h.

References d_bottomScope.

void SearchSat::addSplitter	(	const Expr &	e,
		int	priority
	)			[private]

Core theory callback which suggests a splitter.

Definition at line 186 of file search_sat.cpp.

References addLemma(), CVC3::SearchEngine::d_commonRules, DebugAssert, CVC3::CommonProofRules::excludedMiddle(), and CVC3::Expr::isEq().

Referenced by CVC3::SearchSatCoreSatAPI::addSplitter().

void SearchSat::assertLit

(

SAT::Lit

l

)

[private]

DPLLT callback to inform theory that a literal has been assigned.

Definition at line 193 of file search_sat.cpp.

References SAT::CNF_Manager::addAssumption(), CVC3::TheoryCore::addFact(), CVC3::CommonProofRules::assumpRule(), SAT::CNF_Manager::concreteLit(), d_cnfManager, CVC3::SearchEngine::d_commonRules, CVC3::SearchEngine::d_core, d_intAssumptions, DebugAssert, CVC3::FALSE_VAL, CVC3::TheoryCore::getCM(), getValue(), SAT::Lit::getVar(), IF_DEBUG, CVC3::Expr::isAbsLiteral(), CVC3::Expr::isIntAssumption(), CVC3::Expr::isNot(), CVC3::Expr::isNull(), SAT::Lit::isPositive(), CVC3::CDList< T >::push_back(), CVC3::ContextManager::scopeLevel(), CVC3::Expr::setIntAssumption(), CVC3::Theorem::setQuantLevel(), setValue(), CVC3::SearchEngine::theoryCore(), CVC3::Expr::toString(), CVC3::TRACE, CVC3::TRUE_VAL, SAT::Var::TRUE_VAL, and SAT::Var::UNKNOWN.

SAT::DPLLT::ConsistentResult SearchSat::checkConsistent	(	SAT::CNF_Formula &	cnf,
		bool	fullEffort
	)			[private]

DPLLT callback to ask if theory has detected inconsistency.

Definition at line 258 of file search_sat.cpp.

References CVC3::TheoryCore::checkSATCore(), SAT::CNF_Manager::convertLemma(), d_cnfManager, CVC3::SearchEngine::d_core, d_inCheckSat, d_lemmas, d_lemmasNext, d_pendingLemmas, d_pendingLemmasNext, d_vars, DebugAssert, CVC3::TheoryCore::inconsistent(), CVC3::TheoryCore::inconsistentThm(), SAT::CD_CNF_Formula::numClauses(), SAT::CNF_Manager::numVars(), and SAT::Var::UNKNOWN.

Lit SearchSat::getImplication

(

)

[private]

DPLLT callback to get theory propagations.

Definition at line 284 of file search_sat.cpp.

References d_cnfManager, CVC3::SearchEngine::d_core, d_theorems, DebugAssert, SAT::CNF_Manager::getCNFLit(), CVC3::Theorem::getExpr(), CVC3::TheoryCore::getImpliedLiteral(), getValue(), CVC3::CDMap< Key, Data, HashFcn >::insert(), SAT::Lit::isNull(), CVC3::Theorem::isNull(), CVC3::Expr::isUserRegisteredAtom(), SAT::Lit::reset(), CVC3::TRUE_VAL, and CVC3::Expr::unnegate().

void SearchSat::getExplanation	(	SAT::Lit	l,
		SAT::CNF_Formula &	cnf
	)			[private]

DPLLT callback to explain a theory propagation.

Definition at line 304 of file search_sat.cpp.

References SAT::CNF_Manager::concreteLit(), SAT::CNF_Manager::convertLemma(), d_cnfManager, d_theorems, d_vars, DebugAssert, SAT::CNF_Formula::empty(), CVC3::CDMap< Key, Data, HashFcn >::end(), CVC3::CDMap< Key, Data, HashFcn >::find(), SAT::CNF_Manager::numVars(), and SAT::Var::UNKNOWN.

bool SearchSat::getNewClauses

(

SAT::CNF_Formula &

cnf

)

[private]

DPLLT callback to get more general theory clauses.

Definition at line 318 of file search_sat.cpp.

References SAT::CNF_Manager::addLemma(), d_cnfManager, d_lemmas, d_lemmasNext, d_pendingLemmas, d_pendingLemmasNext, d_pendingScopes, d_vars, DebugAssert, SAT::CD_CNF_Formula::deleteLast(), SAT::CD_CNF_Formula::numClauses(), SAT::CNF_Manager::numVars(), recordNewRootLit(), and SAT::Var::UNKNOWN.

Referenced by check().

Lit SearchSat::makeDecision

(

)

[private]

DPLLT callback to decide which literal to split on next.

Definition at line 346 of file search_sat.cpp.

References d_inCheckSat, d_prioritySet, d_prioritySetStart, DebugAssert, findSplitterRec(), and getValue().

bool SearchSat::findSplitterRec	(	SAT::Lit	lit,
		SAT::Var::Val	value,
		SAT::Lit *	litDecision
	)			[private]

Recursively traverse DAG looking for a splitter.

Returns true if a splitter is found, false otherwise. The splitter is returned in lit (lit should be set to true). Nodes whose current value is fully justified are marked by calling setFlag to avoid searching them in the future.

Definition at line 364 of file search_sat.cpp.

References CVC3::AND, checkJustified(), SAT::CNF_Manager::concreteVar(), d_cnfManager, DebugAssert, std::endl(), CVC3::FALSE_VAL, FatalAssert, SAT::CNF_Manager::getFanin(), CVC3::Expr::getKind(), getValue(), SAT::Lit::getVar(), CVC3::IFF, CVC3::IMPLIES, CVC3::Expr::isAbsAtomicFormula(), SAT::Lit::isFalse(), SAT::Lit::isInverted(), SAT::Lit::isTrue(), SAT::Lit::isVar(), CVC3::ITE, SAT::CNF_Manager::numFanins(), CVC3::OR, setJustified(), CVC3::TRUE_VAL, CVC3::UNKNOWN, and CVC3::XOR.

Referenced by makeDecision().

SAT::Var::Val CVC3::SearchSat::getValue

(

SAT::Lit

c

)

[inline, private]

Get the value of a CNF Literal.

Definition at line 214 of file search_sat.h.

References d_vars, DebugAssert, SAT::Var::FALSE_VAL, SAT::Lit::getVar(), SAT::Var::invertValue(), SAT::Lit::isInverted(), SAT::Lit::isNull(), SAT::Lit::isPositive(), SAT::Lit::isTrue(), SAT::Lit::isVar(), and SAT::Var::TRUE_VAL.

Referenced by assertLit(), findSplitterRec(), getImplication(), getValue(), and makeDecision().

SAT::Var::Val CVC3::SearchSat::getValue

(

SAT::Var

v

)

[inline, private]

Definition at line 223 of file search_sat.h.

References d_vars, DebugAssert, and SAT::Var::isVar().

void CVC3::SearchSat::setValue	(	SAT::Var	v,
		SAT::Var::Val	val
	)			[inline, private]

Set the value of a variable.

Definition at line 229 of file search_sat.h.

References d_vars, d_varsUndoList, d_varsUndoListSize, DebugAssert, SAT::Var::isNull(), and SAT::Var::UNKNOWN.

Referenced by assertLit().

bool CVC3::SearchSat::checkJustified

(

SAT::Var

v

)

[inline, private]

Check whether this variable's value is justified.

Definition at line 241 of file search_sat.h.

References SAT::CNF_Manager::concreteLit(), d_cnfManager, and CVC3::Expr::isJustified().

Referenced by findSplitterRec().

void CVC3::SearchSat::setJustified

(

SAT::Var

v

)

[inline, private]

Mark this variable as justified.

Definition at line 245 of file search_sat.h.

References SAT::CNF_Manager::concreteLit(), d_cnfManager, and CVC3::Expr::setJustified().

Referenced by findSplitterRec().

QueryResult SearchSat::check	(	const Expr &	e,
		Theorem &	result,
		bool	isRestart = false
	)			[private]

Main checking procedure shared by checkValid and restart.

Definition at line 638 of file search_sat.cpp.

References CVC3::CommonProofRules::assumpRule(), SAT::DPLLT::checkSat(), SAT::CNF_Manager::concreteLit(), SAT::DPLLT::continueCheck(), d_bottomScope, d_cnfManager, CVC3::SearchEngine::d_commonRules, CVC3::SearchEngine::d_core, d_dpllt, d_dplltReady, d_inCheckSat, d_lastCheck, d_lastValid, d_lemmas, d_lemmasNext, d_prioritySetBottomEntriesSize, d_prioritySetBottomEntriesSizeStack, CVC3::SearchEngine::d_rules, DebugAssert, std::endl(), CVC3::Theory::findExpr(), CVC3::FORALL, CVC3::CDO< T >::get(), CVC3::TheoryCore::getCM(), SAT::DPLLT::getCurAssignments(), SAT::DPLLT::getCurClauses(), getNewClauses(), CVC3::TheoryCore::getPredicates(), SAT::DPLLT::getSatProof(), CVC3::TheoryCore::getTerms(), CVC3::TheoryCore::getTM(), CVC3::Expr::getType(), CVC3::TheoryCore::incomplete(), CVC3::TheoryCore::inconsistent(), CVC3::TheoryCore::inconsistentThm(), CVC3::INVALID, CVC3::Type::isBool(), CVC3::Expr::isFalse(), CVC3::Expr::isNot(), CVC3::Expr::isNull(), CVC3::Expr::isTrue(), newUserAssumptionInt(), SAT::CD_CNF_Formula::numClauses(), pop(), CVC3::SearchEngineRules::proofByContradiction(), push(), CVC3::SATISFIABLE, CVC3::SearchEngineRules::satProof(), CVC3::ContextManager::scopeLevel(), SAT::CNF_Manager::setBottomScope(), CVC3::Theory::simplifyExpr(), CVC3::CDList< T >::size(), CVC3::Theory::theoryOf(), CVC3::Type::toString(), CVC3::Expr::toString(), CVC3::TRACE, CVC3::CommonProofRules::trueTheorem(), CVC3::UNKNOWN, CVC3::UNSATISFIABLE, CVC3::VALID, and CVC3::TheoremManager::withProof().

Referenced by CVC3::SearchSatCoreSatAPI::check(), checkValid(), and restart().

void SearchSat::newUserAssumptionIntHelper	(	const Theorem &	thm,
		SAT::CNF_Formula_Impl &	cnf,
		bool	atBottomScope
	)			[private]

Helper for newUserAssumptionInt.

Definition at line 1041 of file search_sat.cpp.

References SAT::CNF_Manager::addAssumption(), CVC3::CommonProofRules::andElim(), CVC3::Expr::arity(), d_cnfManager, CVC3::SearchEngine::d_commonRules, CVC3::SearchEngine::d_core, SAT::CNF_Formula_Impl::deleteLast(), CVC3::Theorem::getExpr(), CVC3::TheoryCore::getFlags(), CVC3::Expr::isAnd(), and recordNewRootLit().

Referenced by newUserAssumptionInt().

Theorem SearchSat::newUserAssumptionInt	(	const Expr &	e,
		SAT::CNF_Formula_Impl &	cnf,
		bool	atBottomScope
	)			[private]

Helper for newUserAssumption.

Definition at line 1063 of file search_sat.cpp.

References CVC3::TheoryCore::addFact(), CVC3::CommonProofRules::assumpRule(), d_bottomScope, d_cnfManager, CVC3::SearchEngine::d_commonRules, CVC3::SearchEngine::d_core, d_inCheckSat, d_userAssumptions, d_vars, DebugAssert, CVC3::TheoryCore::getCM(), CVC3::Theorem::getExpr(), CVC3::TheoryCore::getExprTrans(), isAssumption(), CVC3::Expr::isFalse(), CVC3::Expr::isTrue(), newUserAssumptionIntHelper(), SAT::CNF_Manager::numVars(), CVC3::ExprTransform::preprocess(), CVC3::CDList< T >::push_back(), CVC3::ContextManager::scopeLevel(), setRecursiveInUserAssumption(), CVC3::Expr::setUserAssumption(), and SAT::Var::UNKNOWN.

Referenced by check(), and newUserAssumption().

virtual const std::string& CVC3::SearchSat::getName

(

)

[inline, virtual]

Name of this search engine.

Implements CVC3::SearchEngine.

Definition at line 268 of file search_sat.h.

References d_name.

void SearchSat::registerAtom

(

const Expr &

e

)

[virtual]

Register an atomic formula of interest.

Registered atoms are tracked by the decision procedures. If one of them is deduced to be true or false, it is added to a list of implied literals. Implied literals can be retrieved with the getImpliedLiteral function

Implements CVC3::SearchEngine.

Definition at line 1001 of file search_sat.cpp.

References CVC3::SearchEngine::d_core, CVC3::Expr::isRegisteredAtom(), CVC3::TheoryCore::registerAtom(), and CVC3::Expr::setUserRegisteredAtom().

Theorem SearchSat::getImpliedLiteral

(

)

[virtual]

Return next literal implied by last assertion. Null Expr if none.

Returned literals are either registered atomic formulas or their negation

Implements CVC3::SearchEngine.

Definition at line 1009 of file search_sat.cpp.

References CVC3::SearchEngine::d_core, d_nextImpliedLiteral, CVC3::Theorem::getExpr(), CVC3::TheoryCore::getImpliedLiteralByIndex(), CVC3::Expr::isUserRegisteredAtom(), and CVC3::Expr::unnegate().

virtual void CVC3::SearchSat::push

(

)

[inline, virtual]

Push a checkpoint.

Implements CVC3::SearchEngine.

Definition at line 271 of file search_sat.h.

References d_dpllt, and SAT::DPLLT::push().

Referenced by check(), and CVC3::SearchSatCoreSatAPI::check().

virtual void CVC3::SearchSat::pop

(

)

[inline, virtual]

Restore last checkpoint.

Implements CVC3::SearchEngine.

Definition at line 272 of file search_sat.h.

References d_dpllt, and SAT::DPLLT::pop().

Referenced by check(), CVC3::SearchSatCoreSatAPI::check(), and returnFromCheck().

virtual QueryResult CVC3::SearchSat::checkValid	(	const Expr &	e,
		Theorem &	result
	)			[inline, virtual]

Checks the validity of a formula in the current context.

If the query is valid, it returns VALID, the result parameter contains the corresponding theorem, and the scope and context are the same as when called. If it returns INVALID, the context will be one which falsifies the query. If it returns UNKNOWN, the context will falsify the query, but the context may be inconsistent. Finally, if it returns ABORT, the context will be one which satisfies as much as possible.

Parameters:

	e	the formula to check.
	result	the resulting theorem, if the formula is valid.

Implements CVC3::SearchEngine.

Definition at line 273 of file search_sat.h.

References check().

virtual QueryResult CVC3::SearchSat::restart	(	const Expr &	e,
		Theorem &	result
	)			[inline, virtual]

Reruns last check with e as an additional assumption.

This method should only be called after a query which is invalid.

Parameters:

	e	the additional assumption
	result	the resulting theorem, if the query is valid.

Implements CVC3::SearchEngine.

Definition at line 275 of file search_sat.h.

References check().

void SearchSat::returnFromCheck

(

)

[virtual]

Returns to context immediately before last call to checkValid.

This method should only be called after a query which returns something other than VALID.

Implements CVC3::SearchEngine.

Definition at line 1021 of file search_sat.cpp.

References d_bottomScope, and pop().

virtual Theorem CVC3::SearchSat::lastThm

(

)

[inline, virtual]

Returns the result of the most recent valid theorem.

Returns Null Theorem if last call was not valid

Implements CVC3::SearchEngine.

Definition at line 278 of file search_sat.h.

References d_lastValid.

Theorem SearchSat::newUserAssumption

(

const Expr &

e

)

[virtual]

Generate and add an assumption to the set of assumptions in the current context.

By default, the assumption is added at the current scope. The default can be overridden by specifying the scope parameter.

Implements CVC3::SearchEngine.

Definition at line 1101 of file search_sat.cpp.

References SAT::DPLLT::addAssertion(), d_dpllt, and newUserAssumptionInt().

Referenced by CVC3::SearchSatCoreSatAPI::addAssumption().

void SearchSat::getUserAssumptions

(

std::vector< Expr > &

assumptions

)

[virtual]

Get all user assumptions made in this and all previous contexts.

User assumptions are created either by calls to newUserAssumption or a call to checkValid. In the latter case, the negated query is added as an assumption.

Parameters:

assumptions

should be empty on entry.

Implements CVC3::SearchEngine.

Definition at line 1110 of file search_sat.cpp.

References CVC3::CDList< T >::begin(), d_userAssumptions, and CVC3::CDList< T >::end().

void SearchSat::getInternalAssumptions

(

std::vector< Expr > &

assumptions

)

[virtual]

Get assumptions made internally in this and all previous contexts.

Internal assumptions are literals assumed by the sat solver.

Parameters:

assumptions

should be empty on entry.

Implements CVC3::SearchEngine.

Definition at line 1118 of file search_sat.cpp.

References CVC3::CDList< T >::begin(), d_intAssumptions, and CVC3::CDList< T >::end().

Referenced by getCounterExample().

void SearchSat::getAssumptions

(

std::vector< Expr > &

assumptions

)

[virtual]

Get all assumptions made in this and all previous contexts.

Parameters:

assumptions

should be an empty vector which will be filled \ with the assumptions

Implements CVC3::SearchEngine.

Definition at line 1127 of file search_sat.cpp.

References CVC3::CDList< T >::begin(), d_intAssumptions, d_userAssumptions, CVC3::CDList< T >::end(), CVC3::Theorem::getExpr(), CVC3::Expr::isUserAssumption(), and CVC3::CDList< T >::push_back().

bool SearchSat::isAssumption

(

const Expr &

e

)

[virtual]

Check if the formula has already been assumed previously.

Implements CVC3::SearchEngine.

Definition at line 1162 of file search_sat.cpp.

References CVC3::Expr::isIntAssumption(), and CVC3::Expr::isUserAssumption().

Referenced by newUserAssumptionInt().

void SearchSat::getCounterExample	(	std::vector< Expr > &	assertions,
		bool	inOrder = true
	)			[virtual]

Will return the set of assertions which make the queried formula false.

This method should only be called after an query which returns INVALID. It will try to return the simplest possible set of assertions which are sufficient to make the queried expression false.

Parameters:

	assertions	should be empty on entry.
	inOrder	if true, returns the assertions in the order they were asserted. This is slightly more expensive than inOrder = false.

Implements CVC3::SearchEngine.

Definition at line 1168 of file search_sat.cpp.

References d_lastValid, CVC3::CDO< T >::get(), getInternalAssumptions(), and CVC3::Theorem::isNull().

Proof SearchSat::getProof

(

)

[virtual]

Returns the proof term for the last proven query.

It should be called only after a query which returns VALID. In any other case, it returns Null.

Implements CVC3::SearchEngine.

Definition at line 1177 of file search_sat.cpp.

References CVC3::SearchEngine::d_core, d_lastValid, CVC3::CDO< T >::get(), CVC3::Theorem::getProof(), CVC3::TheoryCore::getTM(), CVC3::Theorem::isNull(), and CVC3::TheoremManager::withProof().

virtual FormulaValue CVC3::SearchSat::getValue

(

const CVC3::Expr &

e

)

[inline, virtual]

Implements CVC3::SearchEngine.

Definition at line 289 of file search_sat.h.

References d_cnfManager, DebugAssert, std::endl(), CVC3::FALSE_VAL, SAT::Var::FALSE_VAL, FatalAssert, SAT::CNF_Manager::getCNFLit(), getValue(), SAT::Lit::isNull(), CVC3::Expr::toString(), CVC3::TRUE_VAL, SAT::Var::TRUE_VAL, SAT::Var::UNKNOWN, and CVC3::UNKNOWN_VAL.

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Friends And Related Function Documentation

friend class Restorer [friend]

Helper class for resetting DPLLT engine.

We need to be notified when the scope goes below the scope from which the last invalid call to checkValid originated. This helper class ensures that this happens.

Definition at line 158 of file search_sat.h.

friend class SearchSatCoreSatAPI [friend]

Definition at line 179 of file search_sat.h.

Referenced by SearchSat().

friend class SearchSatCNFCallback [friend]

Definition at line 180 of file search_sat.h.

Referenced by SearchSat().

friend class SearchSatTheoryAPI [friend]

Definition at line 188 of file search_sat.h.

Referenced by SearchSat().

friend class SearchSatDecider [friend]

Definition at line 200 of file search_sat.h.

Referenced by SearchSat().

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Member Data Documentation

std::string CVC3::SearchSat::d_name [private]

Name of search engine.

Definition at line 43 of file search_sat.h.

Referenced by getName().

CDO<int> CVC3::SearchSat::d_bottomScope [private]

Bottom scope for current query.

Definition at line 46 of file search_sat.h.

Referenced by check(), getBottomScope(), newUserAssumptionInt(), recordNewRootLit(), restorePre(), and returnFromCheck().

CDO<Expr> CVC3::SearchSat::d_lastCheck [private]

Last expr checked for validity.

Definition at line 49 of file search_sat.h.

Referenced by check().

CDO<Theorem> CVC3::SearchSat::d_lastValid [private]

Theorem from the last successful checkValid call. It is used by getProof and getAssumptions.

Definition at line 53 of file search_sat.h.

Referenced by check(), getCounterExample(), getProof(), and lastThm().

CDList<Theorem> CVC3::SearchSat::d_userAssumptions [private]

List of all user assumptions.

Definition at line 56 of file search_sat.h.

Referenced by getAssumptions(), getUserAssumptions(), and newUserAssumptionInt().

CDList<Theorem> CVC3::SearchSat::d_intAssumptions [private]

List of all internal assumptions.

Definition at line 59 of file search_sat.h.

Referenced by assertLit(), getAssumptions(), and getInternalAssumptions().

CDO<unsigned> CVC3::SearchSat::d_idxUserAssump [private]

Index to where unprocessed assumptions start.

Definition at line 62 of file search_sat.h.

TheoryCore::CoreSatAPI* CVC3::SearchSat::d_coreSatAPI [private]

Definition at line 64 of file search_sat.h.

Referenced by SearchSat(), and ~SearchSat().

SAT::DPLLT* CVC3::SearchSat::d_dpllt [private]

Pointer to DPLLT implementation.

Definition at line 67 of file search_sat.h.

Referenced by check(), newUserAssumption(), pop(), push(), SearchSat(), and ~SearchSat().

SAT::DPLLT::TheoryAPI* CVC3::SearchSat::d_theoryAPI [private]

Implementation of TheoryAPI for DPLLT.

Definition at line 70 of file search_sat.h.

Referenced by SearchSat(), and ~SearchSat().

SAT::DPLLT::Decider* CVC3::SearchSat::d_decider [private]

Implementation of Decider for DPLLT.

Definition at line 73 of file search_sat.h.

Referenced by SearchSat(), and ~SearchSat().

CDMap<Expr, Theorem> CVC3::SearchSat::d_theorems [private]

Store of theorems for expressions sent to DPLLT.

Definition at line 76 of file search_sat.h.

Referenced by getExplanation(), and getImplication().

SAT::CNF_Manager* CVC3::SearchSat::d_cnfManager [private]

Manages CNF formula and its relationship to original Exprs and Theorems.

Definition at line 79 of file search_sat.h.

Referenced by assertLit(), check(), checkConsistent(), checkJustified(), findSplitterRec(), getExplanation(), getImplication(), getNewClauses(), getValue(), newUserAssumptionInt(), newUserAssumptionIntHelper(), SearchSat(), setJustified(), and ~SearchSat().

SAT::CNF_Manager::CNFCallback* CVC3::SearchSat::d_cnfCallback [private]

Callback for CNF_Manager.

Definition at line 82 of file search_sat.h.

Referenced by SearchSat(), and ~SearchSat().

std::vector<SAT::Var::Val> CVC3::SearchSat::d_vars [private]

Cached values of variables.

Definition at line 85 of file search_sat.h.

Referenced by checkConsistent(), getExplanation(), getNewClauses(), getValue(), newUserAssumptionInt(), restore(), and setValue().

bool CVC3::SearchSat::d_inCheckSat [private]

Whether we are currently in a call to dpllt->checkSat.

Definition at line 88 of file search_sat.h.

Referenced by check(), checkConsistent(), makeDecision(), and newUserAssumptionInt().

SAT::CD_CNF_Formula CVC3::SearchSat::d_lemmas [private]

CNF Formula used for theory lemmas.

Definition at line 91 of file search_sat.h.

Referenced by check(), checkConsistent(), and getNewClauses().

std::vector<std::pair<Theorem, int> > CVC3::SearchSat::d_pendingLemmas [private]

Lemmas waiting to be translated since last call to getNewClauses().

Definition at line 94 of file search_sat.h.

Referenced by addLemma(), checkConsistent(), getNewClauses(), and restore().

std::vector<bool> CVC3::SearchSat::d_pendingScopes [private]

Scope parameter for lemmas waiting to be translated since last call to getNewClauses().

Definition at line 97 of file search_sat.h.

Referenced by addLemma(), getNewClauses(), and restore().

CDO<unsigned> CVC3::SearchSat::d_pendingLemmasSize [private]

Backtracking size of d_pendingLemmas.

Definition at line 100 of file search_sat.h.

Referenced by addLemma(), and restore().

CDO<unsigned> CVC3::SearchSat::d_pendingLemmasNext [private]

Backtracking next item in d_pendingLemmas.

Definition at line 103 of file search_sat.h.

Referenced by addLemma(), checkConsistent(), and getNewClauses().

CDO<unsigned> CVC3::SearchSat::d_lemmasNext [private]

Current position in d_lemmas.

Definition at line 106 of file search_sat.h.

Referenced by check(), checkConsistent(), and getNewClauses().

std::vector<unsigned> CVC3::SearchSat::d_varsUndoList [private]

List for backtracking var values.

Definition at line 109 of file search_sat.h.

Referenced by restore(), and setValue().

CDO<unsigned> CVC3::SearchSat::d_varsUndoListSize [private]

Backtracking size of d_varsUndoList.

Definition at line 112 of file search_sat.h.

Referenced by restore(), and setValue().

std::set<LitPriorityPair> CVC3::SearchSat::d_prioritySet [private]

Used to determine order to find splitters.

Definition at line 131 of file search_sat.h.

Referenced by makeDecision(), recordNewRootLit(), restore(), restorePre(), and SearchSat().

CDO<std::set<LitPriorityPair>::const_iterator> CVC3::SearchSat::d_prioritySetStart [private]

Current position in prioritySet.

Definition at line 133 of file search_sat.h.

Referenced by makeDecision(), recordNewRootLit(), and SearchSat().

CDO<unsigned> CVC3::SearchSat::d_prioritySetEntriesSize [private]

Backtracking size of priority set entries.

Definition at line 135 of file search_sat.h.

Referenced by recordNewRootLit(), and restore().

std::vector<std::set<LitPriorityPair>::iterator> CVC3::SearchSat::d_prioritySetEntries [private]

Entries in priority set in insertion order (so set can be backtracked).

Definition at line 137 of file search_sat.h.

Referenced by recordNewRootLit(), and restore().

std::vector<unsigned> CVC3::SearchSat::d_prioritySetBottomEntriesSizeStack [private]

Backtracking size of priority set entries at bottom scope.

Definition at line 139 of file search_sat.h.

Referenced by check(), and restorePre().

unsigned CVC3::SearchSat::d_prioritySetBottomEntriesSize [private]

Current size of bottom entries.

Definition at line 141 of file search_sat.h.

Referenced by check(), recordNewRootLit(), and restorePre().

std::vector<std::set<LitPriorityPair>::iterator> CVC3::SearchSat::d_prioritySetBottomEntries [private]

Entries in priority set in insertion order (so set can be backtracked).

Definition at line 143 of file search_sat.h.

Referenced by recordNewRootLit(), and restorePre().

CDO<unsigned> CVC3::SearchSat::d_lastRegisteredVar [private]

Last Var registered with core theory.

Definition at line 146 of file search_sat.h.

CDO<bool> CVC3::SearchSat::d_dplltReady [private]

Whether it's OK to call DPLLT solver from the current scope.

Definition at line 149 of file search_sat.h.

Referenced by check().

CDO<unsigned> CVC3::SearchSat::d_nextImpliedLiteral [private]

Definition at line 151 of file search_sat.h.

Referenced by getImpliedLiteral().

Restorer CVC3::SearchSat::d_restorer [private]

Instance of Restorer class.

Definition at line 168 of file search_sat.h.

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The documentation for this class was generated from the following files:

• search_sat.h
• search_sat.cpp

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