Package org.sosy_lab.java_smt.basicimpl.withAssumptionsWrapper

Class InterpolatingProverWithAssumptionsWrapper<T>

java.lang.Object

org.sosy_lab.java_smt.basicimpl.withAssumptionsWrapper.BasicProverWithAssumptionsWrapper<T,InterpolatingProverEnvironment<T>>

org.sosy_lab.java_smt.basicimpl.withAssumptionsWrapper.InterpolatingProverWithAssumptionsWrapper<T>

All Implemented Interfaces:

AutoCloseable, BasicProverEnvironment<T>, InterpolatingProverEnvironment<T>

public class InterpolatingProverWithAssumptionsWrapper<T>
extends BasicProverWithAssumptionsWrapper<T,InterpolatingProverEnvironment<T>>
implements InterpolatingProverEnvironment<T>

Nested Class Summary

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

BasicProverEnvironment.AllSatCallback<R>

Field Summary

Fields inherited from class org.sosy_lab.java_smt.basicimpl.withAssumptionsWrapper.BasicProverWithAssumptionsWrapper

delegate, solverAssumptionsAsFormula

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

NO_MODEL_HELP

Constructor Summary

Constructors

Constructor	Description
InterpolatingProverWithAssumptionsWrapper(InterpolatingProverEnvironment<T> pDelegate, FormulaManager pFmgr)

Method Summary

Modifier and Type	Method	Description
protected void	clearAssumptions()
BooleanFormula	getInterpolant(Collection<T> pFormulasOfA)	Get an interpolant for two groups of formulas.
List<BooleanFormula>	getSeqInterpolants(List<? extends Collection<T>> pPartitionedFormulas)	This method returns interpolants of an 'inductive sequence'.
List<BooleanFormula>	getTreeInterpolants(List<? extends Collection<T>> pPartitionedFormulas, int[] pStartOfSubTree)	Compute a sequence of interpolants.
protected void	registerPushedFormula(T pPushResult)	overridden in sub-class.

Methods inherited from class org.sosy_lab.java_smt.basicimpl.withAssumptionsWrapper.BasicProverWithAssumptionsWrapper

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

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

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

getSeqInterpolants0, getTreeInterpolants0

Constructor Details

InterpolatingProverWithAssumptionsWrapper

public InterpolatingProverWithAssumptionsWrapper(InterpolatingProverEnvironment<T> pDelegate,
 FormulaManager pFmgr)

Method Details

getInterpolant

public BooleanFormula getInterpolant(Collection<T> pFormulasOfA)
                              throws SolverException,
InterruptedException

Description copied from interface: InterpolatingProverEnvironment

Get an interpolant for two groups of formulas. This should be called only immediately after an BasicProverEnvironment.isUnsat() call that returned true.

There is no direct guarantee that the interpolants returned are part of an inductive sequence', however this seems to work for most solvers as long as the same proof is used, i.e. all interpolants are computed after the same SAT-check. If a solver does not use the same internal proof for several interpolation queries (such as CVC5), then the returned interpolants might not satisfy the sequence-criteria. We suggest the proper method InterpolatingProverEnvironment.getSeqInterpolants(java.util.List<? extends java.util.Collection<T>>) for that case.

Specified by:

getInterpolant in interface InterpolatingProverEnvironment<T>

Parameters:

pFormulasOfA - A collection of values returned by BasicProverEnvironment.push(BooleanFormula). All the corresponding formulas from group A, the remaining formulas form group B.

Returns:

An interpolant for A and B

Throws:

SolverException - if interpolant cannot be computed, for example because interpolation procedure is incomplete

InterruptedException

getSeqInterpolants

public List<BooleanFormula> getSeqInterpolants(List<? extends Collection<T>> pPartitionedFormulas)
                                        throws SolverException,
InterruptedException

Description copied from interface: InterpolatingProverEnvironment

This method returns interpolants of an 'inductive sequence'. This property must be supported by the interpolation-strategy of the underlying SMT-solver! Depending on the underlying SMT-solver this method might be faster than N direct calls to getInterpolant().

The prover stack should contain the partitioned formulas, but any order is allowed. For an input of N partitions we return N-1 interpolants. Any asserted formula that is on the prover stack and not part of the partitioned list, will be used for background theory and its symbols can appear in any interpolant.

Specified by:

getSeqInterpolants in interface InterpolatingProverEnvironment<T>

Returns:

a 'inductive sequence' of interpolants, such that the implication AND(I_i, P_i) => I_(i+1) is satisfied for all i, where P_i is the conjunction of all formulas in partition i.

Throws:

SolverException - if interpolant cannot be computed, for example because interpolation procedure is incomplete

InterruptedException

getTreeInterpolants

public List<BooleanFormula> getTreeInterpolants(List<? extends Collection<T>> pPartitionedFormulas,
 int[] pStartOfSubTree)
                                         throws SolverException,
InterruptedException

Description copied from interface: InterpolatingProverEnvironment

Compute a sequence of interpolants. The nesting array describes the start of the subtree for tree interpolants. For inductive sequences of interpolants use a nesting array completely filled with 0.

Example:

 A  D
 |  |
 B  E
 | /
 C
 |
 F  H
 | /
 G

 arrayIndex     = [0,1,2,3,4,5,6,7]  // only for demonstration, not needed
 partition      = [A,B,D,E,C,F,H,G]  // post-order of tree
 startOfSubTree = [0,0,2,2,0,0,6,0]  // index of left-most leaf of the current element
 

The prover stack should contain the partitioned formulas. For an input of N partitions (nodes in the tree) we return N-1 interpolants (one interpolant for/below each node except the root). Any asserted formula that is on the prover stack and not part of the partitioned list, will be used for background theory and its symbols can appear in any interpolant.

Specified by:

getTreeInterpolants in interface InterpolatingProverEnvironment<T>

Parameters:

pPartitionedFormulas - of formulas

pStartOfSubTree - The start of the subtree containing the formula at this index as root.

Returns:

Tree interpolants respecting the nesting relation.

Throws:

SolverException - if interpolant cannot be computed, for example because interpolation procedure is incomplete

InterruptedException

registerPushedFormula

protected void registerPushedFormula(T pPushResult)

Description copied from class: BasicProverWithAssumptionsWrapper

overridden in sub-class.

Overrides:

registerPushedFormula in class BasicProverWithAssumptionsWrapper<T,InterpolatingProverEnvironment<T>>

clearAssumptions

protected void clearAssumptions()

Overrides:

clearAssumptions in class BasicProverWithAssumptionsWrapper<T,InterpolatingProverEnvironment<T>>