Package org.sosy_lab.java_smt.basicimpl.withAssumptionsWrapper

Class ProverWithAssumptionsWrapper

java.lang.Object

org.sosy_lab.java_smt.basicimpl.withAssumptionsWrapper.ProverWithAssumptionsWrapper

All Implemented Interfaces:

AutoCloseable, BasicProverEnvironment<Void>, ProverEnvironment

public class ProverWithAssumptionsWrapper
extends Object
implements ProverEnvironment

Nested Class Summary

Nested classes/interfaces inherited from interface org.sosy_lab.java_smt.api.BasicProverEnvironment

BasicProverEnvironment.AllSatCallback<R>

Field Summary

Fields

Modifier and Type	Field	Description
protected final ProverEnvironment	delegate
protected final List<BooleanFormula>	solverAssumptionsAsFormula

Fields inherited from interface org.sosy_lab.java_smt.api.BasicProverEnvironment

ASSUMPTION_SOLVING_NOT_SUPPORTED, NO_MODEL_HELP, UNSAT_CORE_NOT_SUPPORTED, UNSAT_CORE_WITH_ASSUMPTIONS_NOT_SUPPORTED

Constructor Summary

Constructors

Constructor	Description
ProverWithAssumptionsWrapper(ProverEnvironment pDelegate)

Method Summary

Modifier and Type	Method	Description
Void	addConstraint(BooleanFormula constraint)	Add a constraint to the latest backtracking point.
<R> R	allSat(BasicProverEnvironment.AllSatCallback<R> pCallback, List<BooleanFormula> pImportant)	Get all satisfying assignments of the current environment with regard to a subset of terms, and create a region representing all those models.
protected void	clearAssumptions()
void	close()	Closes the prover environment.
Model	getModel()	Get a satisfying assignment.
ImmutableList<Model.ValueAssignment>	getModelAssignments()	Get a list of satisfying assignments.
ImmutableMap<String,String>	getStatistics()	Get statistics for a concrete ProverEnvironment in a solver.
List<BooleanFormula>	getUnsatCore()	Get an unsat core.
boolean	isUnsat()	Check whether the conjunction of all formulas on the stack is unsatisfiable.
boolean	isUnsatWithAssumptions(Collection<BooleanFormula> assumptions)	Check whether the conjunction of all formulas on the stack together with the list of assumptions is satisfiable.
void	pop()	Remove one backtracking point/level from the current stack.
void	push()	Create a new backtracking point, i.e., a new level on the assertion stack.
protected void	registerPushedFormula(Void pPushResult)	overridden in subclass.
int	size()	Get the number of backtracking points/levels on the current stack.
String	toString()
Optional<List<BooleanFormula>>	unsatCoreOverAssumptions(Collection<BooleanFormula> pAssumptions)	Returns an UNSAT core (if it exists, otherwise Optional.empty()), over the chosen assumptions.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.sosy_lab.java_smt.api.BasicProverEnvironment

addConstraint, allSat, close, getEvaluator, getModel, getModelAssignments, getStatistics, getUnsatCore, isUnsat, isUnsatWithAssumptions, pop, push, push, registerUserPropagator, size, unsatCoreOverAssumptions

Field Details

delegate

protected final ProverEnvironment delegate

solverAssumptionsAsFormula

protected final List<BooleanFormula> solverAssumptionsAsFormula

Constructor Details

ProverWithAssumptionsWrapper

public ProverWithAssumptionsWrapper(ProverEnvironment pDelegate)

Method Details

clearAssumptions

protected void clearAssumptions()

pop

public void pop()

Description copied from interface: BasicProverEnvironment

Remove one backtracking point/level from the current stack. This removes the latest level including all of its formulas, i.e., all formulas that were added for this backtracking point.

Specified by:

pop in interface BasicProverEnvironment<T>

addConstraint

public Void addConstraint(BooleanFormula constraint)
                   throws InterruptedException

Description copied from interface: BasicProverEnvironment

Add a constraint to the latest backtracking point.

Specified by:

addConstraint in interface BasicProverEnvironment<T>

Throws:

InterruptedException

push

public void push()
          throws InterruptedException

Description copied from interface: BasicProverEnvironment

Create a new backtracking point, i.e., a new level on the assertion stack. Each level can hold several asserted formulas.

If formulas are added before creating the first backtracking point, they can not be removed via a POP-operation.

Specified by:

push in interface BasicProverEnvironment<T>

Throws:

InterruptedException

size

public int size()

Description copied from interface: BasicProverEnvironment

Get the number of backtracking points/levels on the current stack.

Caution: This is the number of PUSH-operations, and not necessarily equal to the number of asserted formulas. On any level there can be an arbitrary number of asserted formulas. Even with size of 0, formulas can already be asserted (at bottom level).

Specified by:

size in interface BasicProverEnvironment<T>

isUnsat

public boolean isUnsat()
                throws SolverException,
InterruptedException

Description copied from interface: BasicProverEnvironment

Check whether the conjunction of all formulas on the stack is unsatisfiable.

Specified by:

isUnsat in interface BasicProverEnvironment<T>

Throws:

SolverException

InterruptedException

isUnsatWithAssumptions

public boolean isUnsatWithAssumptions(Collection<BooleanFormula> assumptions)
                               throws SolverException,
InterruptedException

Description copied from interface: BasicProverEnvironment

Check whether the conjunction of all formulas on the stack together with the list of assumptions is satisfiable.

Specified by:

isUnsatWithAssumptions in interface BasicProverEnvironment<T>

Parameters:

assumptions - A list of literals.

Throws:

SolverException

InterruptedException

registerPushedFormula

protected void registerPushedFormula(Void pPushResult)

overridden in subclass.

getModel

public Model getModel()
               throws SolverException

Description copied from interface: BasicProverEnvironment

Get a satisfying assignment. This method should be called only immediately after an BasicProverEnvironment.isUnsat() call that returned false.

Some solvers (such as MathSAT or Z3) guarantee that a model stays constant and valid as long as the solver context is available, even if constraints are added to, pushed or popped from the prover stack. If the solver does not provide this guarantee, the model will be invalidated by the next such operation, and using it will lead to an exception.

A model might not provide values for all symbols known to the solver, but it should at least provide values for all free symbols occurring in the asserted formulas. For other symbols, the behavior is solver-dependent, e.g., the model might provide default values or leave them undefined. For uninterpreted functions, the model should provide values for all instantiations. For arrays, the model should provide values for all accessed indices. For both, uninterpreted functions and arrays, some solvers do not provide all instantiations, but only most of them. A model might contain additional symbols with their evaluation, if a solver uses its own temporary symbols.

Specified by:

getModel in interface BasicProverEnvironment<T>

Throws:

SolverException

getModelAssignments

public ImmutableList<Model.ValueAssignment> getModelAssignments()
                                                         throws SolverException

Description copied from interface: BasicProverEnvironment

Get a list of satisfying assignments. This is equivalent to ImmutableList.copyOf(getModel()), but removes the need for calling Model.close().

Note that if you need to iterate multiple times over the model it may be more efficient to use this method instead of BasicProverEnvironment.getModel() (depending on the solver).

Specified by:

getModelAssignments in interface BasicProverEnvironment<T>

Throws:

SolverException

getUnsatCore

public List<BooleanFormula> getUnsatCore()

Description copied from interface: BasicProverEnvironment

Get an unsat core.

This should be called only immediately after an BasicProverEnvironment.isUnsat() call that returned false. Requires the SolverContext.ProverOptions.GENERATE_UNSAT_CORE option to work.

Specified by:

getUnsatCore in interface BasicProverEnvironment<T>

unsatCoreOverAssumptions

public Optional<List<BooleanFormula>> unsatCoreOverAssumptions(Collection<BooleanFormula> pAssumptions)
                                                        throws SolverException,
InterruptedException

Description copied from interface: BasicProverEnvironment

Returns an UNSAT core (if it exists, otherwise Optional.empty()), over the chosen assumptions. Neither BasicProverEnvironment.isUnsat(), nor BasicProverEnvironment.isUnsatWithAssumptions(Collection) needs to be called before using this method, as BasicProverEnvironment.isUnsatWithAssumptions(Collection) is automatically called with the given assumptions.

Requires the SolverContext.ProverOptions.GENERATE_UNSAT_CORE_OVER_ASSUMPTIONS option to work. SolverContext.ProverOptions.GENERATE_UNSAT_CORE is not needed, but both options can be safely combined.

Specified by:

unsatCoreOverAssumptions in interface BasicProverEnvironment<T>

Parameters:

pAssumptions - Selected assumptions.

Returns:

Empty optional if the constraints with assumptions are satisfiable, subset of assumptions which is unsatisfiable with the original constraints otherwise.

Throws:

SolverException

InterruptedException

getStatistics

public ImmutableMap<String,String> getStatistics()

Description copied from interface: BasicProverEnvironment

Get statistics for a concrete ProverEnvironment in a solver. The returned mapping is intended to provide solver-internal statistics for only this instance. The keys can differ between individual solvers.

Calling the statistics several times for the same ProverEnvironments returns accumulated number, i.e., we currently do not provide any possibility to reset the statistics. Calling the statistics for different ProverEnvironments returns independent statistics.

We do not guarantee any specific key to be present, as this depends on the used solver. We might even return an empty mapping if the solver does not support calling this method or is in an invalid state.

Specified by:

getStatistics in interface BasicProverEnvironment<T>

See Also:

• SolverContext.getStatistics()

close

public void close()

Description copied from interface: BasicProverEnvironment

Closes the prover environment. The object should be discarded, and should not be used after closing. The first call of this method will close the prover instance, further calls are ignored.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface BasicProverEnvironment<T>

toString

public String toString()

Overrides:

toString in class Object

allSat

public <R> R allSat(BasicProverEnvironment.AllSatCallback<R> pCallback,
 List<BooleanFormula> pImportant)
             throws InterruptedException,
SolverException

Description copied from interface: BasicProverEnvironment

Get all satisfying assignments of the current environment with regard to a subset of terms, and create a region representing all those models.

Specified by:

allSat in interface BasicProverEnvironment<T>

pImportant - A set of (positive) variables appearing in the asserted queries. Only these variables will appear in the region.

Returns:

A region representing all satisfying models of the formula.

Throws:

InterruptedException

SolverException