renamed variable partition to local expression information

Former-commit-id: 59934b401f

src/storage/prism/menu_games/AbstractCommand.cpp

@@ -18,13 +18,13 @@ namespace storm {
     namespace prism {
         namespace menu_games {
             template <storm::dd::DdType DdType, typename ValueType>
-            AbstractCommand<DdType, ValueType>::AbstractCommand(storm::prism::Command const& command, AbstractionExpressionInformation& expressionInformation, AbstractionDdInformation<DdType, ValueType> const& ddInformation, storm::utility::solver::SmtSolverFactory const& smtSolverFactory) : smtSolver(smtSolverFactory.create(expressionInformation.getManager())), expressionInformation(expressionInformation), ddInformation(ddInformation), command(command), variablePartition(expressionInformation.getVariables()), relevantPredicatesAndVariables(), cachedDd(std::make_pair(ddInformation.manager->getBddZero(), 0)), decisionVariables() {
+            AbstractCommand<DdType, ValueType>::AbstractCommand(storm::prism::Command const& command, AbstractionExpressionInformation& globalExpressionInformation, AbstractionDdInformation<DdType, ValueType> const& ddInformation, storm::utility::solver::SmtSolverFactory const& smtSolverFactory) : smtSolver(smtSolverFactory.create(globalExpressionInformation.getManager())), globalExpressionInformation(globalExpressionInformation), ddInformation(ddInformation), command(command), localExpressionInformation(globalExpressionInformation.getVariables()), relevantPredicatesAndVariables(), cachedDd(std::make_pair(ddInformation.manager->getBddZero(), 0)), decisionVariables() {
 
                 // Make the second component of relevant predicates have the right size.
                 relevantPredicatesAndVariables.second.resize(command.getNumberOfUpdates());
                 
                 // Assert all range expressions to enforce legal variable values.
-                for (auto const& rangeExpression : expressionInformation.getRangeExpressions()) {
+                for (auto const& rangeExpression : globalExpressionInformation.getRangeExpressions()) {
                     smtSolver->add(rangeExpression);
                 }
                 
@@ -32,8 +32,8 @@ namespace storm {
                 smtSolver->add(command.getGuardExpression());
 
                 // Refine the command based on all initial predicates.
-                std::vector<uint_fast64_t> allPredicateIndices(expressionInformation.getPredicates().size());
-                for (auto index = 0; index < expressionInformation.getPredicates().size(); ++index) {
+                std::vector<uint_fast64_t> allPredicateIndices(globalExpressionInformation.getNumberOfPredicates());
+                for (auto index = 0; index < globalExpressionInformation.getNumberOfPredicates(); ++index) {
                     allPredicateIndices[index] = index;
                 }
                 this->refine(allPredicateIndices);
@@ -43,10 +43,10 @@ namespace storm {
             void AbstractCommand<DdType, ValueType>::refine(std::vector<uint_fast64_t> const& predicates) {
                 // Add all predicates to the variable partition.
                 for (auto predicateIndex : predicates) {
-                    variablePartition.addExpression(expressionInformation.getPredicates()[predicateIndex]);
+                    localExpressionInformation.addExpression(globalExpressionInformation.getPredicateByIndex(predicateIndex), predicateIndex);
                 }
                 
-                STORM_LOG_TRACE("Current variable partition is: " << variablePartition);
+                STORM_LOG_TRACE("Current variable partition is: " << localExpressionInformation);
                 
                 // Next, we check whether there is work to be done by recomputing the relevant predicates and checking
                 // whether they changed.
@@ -119,19 +119,19 @@ namespace storm {
                 std::set<storm::expressions::Variable> assignedVariables;
                 for (auto const& assignment : assignments) {
                     // Also, variables appearing on the right-hand side of an assignment are relevant for source state.
-                    auto const& rightHandSidePredicates = variablePartition.getExpressionsUsingVariables(assignment.getExpression().getVariables());
+                    auto const& rightHandSidePredicates = localExpressionInformation.getExpressionsUsingVariables(assignment.getExpression().getVariables());
                     result.first.insert(rightHandSidePredicates.begin(), rightHandSidePredicates.end());
                     
                     // Variables that are being assigned are relevant for the successor state.
                     storm::expressions::Variable const& assignedVariable = assignment.getVariable();
-                    auto const& leftHandSidePredicates = variablePartition.getExpressionsUsingVariable(assignedVariable);
+                    auto const& leftHandSidePredicates = localExpressionInformation.getExpressionsUsingVariable(assignedVariable);
                     result.second.insert(leftHandSidePredicates.begin(), leftHandSidePredicates.end());
                     
                     // Keep track of all assigned variables, so we can find the related predicates later.
                     assignedVariables.insert(assignedVariable);
                 }
                 
-                auto const& predicatesRelatedToAssignedVariable = variablePartition.getRelatedExpressions(assignedVariables);
+                auto const& predicatesRelatedToAssignedVariable = localExpressionInformation.getRelatedExpressions(assignedVariables);
                 
                 result.first.insert(predicatesRelatedToAssignedVariable.begin(), predicatesRelatedToAssignedVariable.end());
                 
@@ -143,7 +143,7 @@ namespace storm {
                 std::pair<std::set<uint_fast64_t>, std::vector<std::set<uint_fast64_t>>> result;
 
                 // To start with, all predicates related to the guard are relevant source predicates.
-                result.first = variablePartition.getExpressionsUsingVariables(command.get().getGuardExpression().getVariables());
+                result.first = localExpressionInformation.getExpressionsUsingVariables(command.get().getGuardExpression().getVariables());
                 
                 // Then, we add the predicates that become relevant, because of some update.
                 for (auto const& update : command.get().getUpdates()) {
@@ -173,9 +173,9 @@ namespace storm {
             template <storm::dd::DdType DdType, typename ValueType>
             void AbstractCommand<DdType, ValueType>::addMissingPredicates(std::pair<std::set<uint_fast64_t>, std::vector<std::set<uint_fast64_t>>> const& newRelevantPredicates) {
                 // Determine and add new relevant source predicates.
-                std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>> newSourceVariables = AbstractionDdInformation<DdType, ValueType>::declareNewVariables(expressionInformation.getManager(), relevantPredicatesAndVariables.first, newRelevantPredicates.first);
+                std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>> newSourceVariables = AbstractionDdInformation<DdType, ValueType>::declareNewVariables(globalExpressionInformation.getManager(), relevantPredicatesAndVariables.first, newRelevantPredicates.first);
                 for (auto const& element : newSourceVariables) {
-                    smtSolver->add(storm::expressions::iff(element.first, expressionInformation.getPredicates()[element.second]));
+                    smtSolver->add(storm::expressions::iff(element.first, globalExpressionInformation.getPredicateByIndex(element.second)));
                     decisionVariables.push_back(element.first);
                 }
                 
@@ -185,9 +185,9 @@ namespace storm {
                 
                 // Do the same for every update.
                 for (uint_fast64_t index = 0; index < command.get().getNumberOfUpdates(); ++index) {
-                    std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>> newSuccessorVariables = AbstractionDdInformation<DdType, ValueType>::declareNewVariables(expressionInformation.getManager(), relevantPredicatesAndVariables.second[index], newRelevantPredicates.second[index]);
+                    std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>> newSuccessorVariables = AbstractionDdInformation<DdType, ValueType>::declareNewVariables(globalExpressionInformation.getManager(), relevantPredicatesAndVariables.second[index], newRelevantPredicates.second[index]);
                     for (auto const& element : newSuccessorVariables) {
-                        smtSolver->add(storm::expressions::iff(element.first, expressionInformation.getPredicates()[element.second].substitute(command.get().getUpdate(index).getAsVariableToExpressionMap())));
+                        smtSolver->add(storm::expressions::iff(element.first, globalExpressionInformation.getPredicateByIndex(element.second).substitute(command.get().getUpdate(index).getAsVariableToExpressionMap())));
                         decisionVariables.push_back(element.first);
                     }
                     
@@ -277,7 +277,7 @@ namespace storm {
                 auto relevantIte = relevantPredicatesAndVariables.first.end();
                 
                 storm::dd::Bdd<DdType> result = ddInformation.manager->getBddOne();
-                for (uint_fast64_t predicateIndex = 0; predicateIndex < expressionInformation.getPredicates().size(); ++predicateIndex) {
+                for (uint_fast64_t predicateIndex = 0; predicateIndex < globalExpressionInformation.getNumberOfPredicates(); ++predicateIndex) {
                     if (relevantIt == relevantIte || relevantIt->second != predicateIndex) {
                         result &= ddInformation.predicateIdentities[predicateIndex];
                     } else {

src/storage/prism/menu_games/AbstractCommand.h

@@ -6,7 +6,7 @@
 #include <set>
 #include <map>
 
-#include "src/storage/prism/menu_games/VariablePartition.h"
+#include "src/storage/prism/menu_games/LocalExpressionInformation.h"
 
 #include "src/storage/dd/DdType.h"
 #include "src/storage/expressions/Expression.h"
@@ -155,8 +155,8 @@ namespace storm {
                 // An SMT responsible for this abstract command.
                 std::unique_ptr<storm::solver::SmtSolver> smtSolver;
 
-                // The expression-related information.
-                AbstractionExpressionInformation& expressionInformation;
+                // The global expression-related information.
+                AbstractionExpressionInformation& globalExpressionInformation;
                 
                 // The DD-related information.
                 AbstractionDdInformation<DdType, ValueType> const& ddInformation;
@@ -164,8 +164,8 @@ namespace storm {
                 // The concrete command this abstract command refers to.
                 std::reference_wrapper<Command const> command;
                 
-                // The partition of variables and expressions.
-                VariablePartition variablePartition;
+                // The local expression-related information.
+                LocalExpressionInformation localExpressionInformation;
                 
                 // The currently relevant source/successor predicates and the corresponding variables.
                 std::pair<std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>>, std::vector<std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>>>> relevantPredicatesAndVariables;

src/storage/prism/menu_games/AbstractionExpressionInformation.cpp

@@ -37,6 +37,14 @@ namespace storm {
                 return predicates;
             }
             
+            storm::expressions::Expression const& AbstractionExpressionInformation::getPredicateByIndex(uint_fast64_t index) const {
+                return predicates[index];
+            }
+            
+            std::size_t AbstractionExpressionInformation::getNumberOfPredicates() const {
+                return predicates.size();
+            }
+            
             std::set<storm::expressions::Variable>& AbstractionExpressionInformation::getVariables() {
                 return variables;
             }

src/storage/prism/menu_games/AbstractionExpressionInformation.h

@@ -68,6 +68,20 @@ namespace storm {
                  */
                 std::vector<storm::expressions::Expression> const& getPredicates() const;
                 
+                /*!
+                 * Retrieves the predicate with the given index.
+                 *
+                 * @param index The index of the predicate.
+                 */
+                storm::expressions::Expression const& getPredicateByIndex(uint_fast64_t index) const;
+
+                /*!
+                 * Retrieves the number of predicates.
+                 *
+                 * @return The number of predicates.
+                 */
+                std::size_t getNumberOfPredicates() const;
+                
                 /*!
                  * Retrieves all currently known variables.
                  *

src/storage/prism/menu_games/VariablePartition.cpp → src/storage/prism/menu_games/LocalExpressionInformation.cpp

@@ -1,4 +1,4 @@
-#include "src/storage/prism/menu_games/VariablePartition.h"
+#include "src/storage/prism/menu_games/LocalExpressionInformation.h"
 
 #include <boost/algorithm/string/join.hpp>
 
@@ -7,7 +7,7 @@
 namespace storm {
     namespace prism {
         namespace menu_games {
-            VariablePartition::VariablePartition(std::set<storm::expressions::Variable> const& relevantVariables, std::vector<storm::expressions::Expression> const& expressions) : relevantVariables(relevantVariables), expressionBlocks(relevantVariables.size()) {
+            LocalExpressionInformation::LocalExpressionInformation(std::set<storm::expressions::Variable> const& relevantVariables, std::vector<std::pair<storm::expressions::Expression, uint_fast64_t>> const& expressionIndexPairs) : relevantVariables(relevantVariables), expressionBlocks(relevantVariables.size()) {
                 // Assign each variable to a new block.
                 uint_fast64_t currentBlock = 0;
                 variableBlocks.resize(relevantVariables.size());
@@ -19,12 +19,12 @@ namespace storm {
                 }
                 
                 // Add all expressions, which might relate some variables.
-                for (auto const& expression : expressions) {
-                    this->addExpression(expression);
+                for (auto const& expressionIndexPair : expressionIndexPairs) {
+                    this->addExpression(expressionIndexPair.first, expressionIndexPair.second);
                 }
             }
             
-            bool VariablePartition::addExpression(storm::expressions::Expression const& expression) {
+            bool LocalExpressionInformation::addExpression(storm::expressions::Expression const& expression, uint_fast64_t globalExpressionIndex) {
                 // Register the expression for all variables that appear in it.
                 std::set<storm::expressions::Variable> expressionVariables = expression.getVariables();
                 for (auto const& variable : expressionVariables) {
@@ -37,19 +37,20 @@ namespace storm {
                 expressionBlocks[getBlockIndexOfVariable(*expressionVariables.begin())].insert(this->expressions.size());
 
                 // Add expression and relate all the appearing variables.
+                this->globalToLocalIndexMapping[globalExpressionIndex] = this->expressions.size();
                 this->expressions.push_back(expression);
                 return this->relate(expressionVariables);
             }
             
-            bool VariablePartition::areRelated(storm::expressions::Variable const& firstVariable, storm::expressions::Variable const& secondVariable) {
+            bool LocalExpressionInformation::areRelated(storm::expressions::Variable const& firstVariable, storm::expressions::Variable const& secondVariable) {
                 return getBlockIndexOfVariable(firstVariable) == getBlockIndexOfVariable(secondVariable);
             }
             
-            bool VariablePartition::relate(storm::expressions::Variable const& firstVariable, storm::expressions::Variable const& secondVariable) {
+            bool LocalExpressionInformation::relate(storm::expressions::Variable const& firstVariable, storm::expressions::Variable const& secondVariable) {
                 return this->relate({firstVariable, secondVariable});
             }
             
-            bool VariablePartition::relate(std::set<storm::expressions::Variable> const& variables) {
+            bool LocalExpressionInformation::relate(std::set<storm::expressions::Variable> const& variables) {
                 // Determine all blocks that need to be merged.
                 std::set<uint_fast64_t> blocksToMerge;
                 for (auto const& variable : variables) {
@@ -67,7 +68,7 @@ namespace storm {
                 return true;
             }
             
-            void VariablePartition::mergeBlocks(std::set<uint_fast64_t> const& blocksToMerge) {
+            void LocalExpressionInformation::mergeBlocks(std::set<uint_fast64_t> const& blocksToMerge) {
                 // Merge all blocks into the block to keep.
                 std::vector<std::set<storm::expressions::Variable>> newVariableBlocks;
                 std::vector<std::set<uint_fast64_t>> newExpressionBlocks;
@@ -107,28 +108,28 @@ namespace storm {
                 expressionBlocks = std::move(newExpressionBlocks);
             }
             
-            std::set<storm::expressions::Variable> const& VariablePartition::getBlockOfVariable(storm::expressions::Variable const& variable) const {
+            std::set<storm::expressions::Variable> const& LocalExpressionInformation::getBlockOfVariable(storm::expressions::Variable const& variable) const {
                 return variableBlocks[getBlockIndexOfVariable(variable)];
             }
             
-            uint_fast64_t VariablePartition::getNumberOfBlocks() const {
+            uint_fast64_t LocalExpressionInformation::getNumberOfBlocks() const {
                 return this->variableBlocks.size();
             }
             
-            std::set<storm::expressions::Variable> const& VariablePartition::getVariableBlockWithIndex(uint_fast64_t blockIndex) const {
+            std::set<storm::expressions::Variable> const& LocalExpressionInformation::getVariableBlockWithIndex(uint_fast64_t blockIndex) const {
                 return this->variableBlocks[blockIndex];
             }
             
-            uint_fast64_t VariablePartition::getBlockIndexOfVariable(storm::expressions::Variable const& variable) const {
+            uint_fast64_t LocalExpressionInformation::getBlockIndexOfVariable(storm::expressions::Variable const& variable) const {
                 STORM_LOG_ASSERT(this->relevantVariables.find(variable) != this->relevantVariables.end(), "Illegal variable '" << variable.getName() << "' for partition.");
                 return this->variableToBlockMapping.find(variable)->second;
             }
             
-            std::set<uint_fast64_t> const& VariablePartition::getRelatedExpressions(storm::expressions::Variable const& variable) const {
+            std::set<uint_fast64_t> const& LocalExpressionInformation::getRelatedExpressions(storm::expressions::Variable const& variable) const {
                 return this->expressionBlocks[getBlockIndexOfVariable(variable)];
             }
             
-            std::set<uint_fast64_t> VariablePartition::getRelatedExpressions(std::set<storm::expressions::Variable> const& variables) const {
+            std::set<uint_fast64_t> LocalExpressionInformation::getRelatedExpressions(std::set<storm::expressions::Variable> const& variables) const {
                 // Start by determining the indices of all expression blocks that are related to any of the variables.
                 std::set<uint_fast64_t> relatedExpressionBlockIndices;
                 for (auto const& variable : variables) {
@@ -143,12 +144,12 @@ namespace storm {
                 return result;
             }
             
-            std::set<uint_fast64_t> const& VariablePartition::getExpressionsUsingVariable(storm::expressions::Variable const& variable) const {
+            std::set<uint_fast64_t> const& LocalExpressionInformation::getExpressionsUsingVariable(storm::expressions::Variable const& variable) const {
                 STORM_LOG_ASSERT(this->relevantVariables.find(variable) != this->relevantVariables.end(), "Illegal variable '" << variable.getName() << "' for partition.");
                 return this->variableToExpressionsMapping.find(variable)->second;
             }
             
-            std::set<uint_fast64_t> VariablePartition::getExpressionsUsingVariables(std::set<storm::expressions::Variable> const& variables) const {
+            std::set<uint_fast64_t> LocalExpressionInformation::getExpressionsUsingVariables(std::set<storm::expressions::Variable> const& variables) const {
                 std::set<uint_fast64_t> result;
                 
                 for (auto const& variable : variables) {
@@ -160,11 +161,11 @@ namespace storm {
                 return result;
             }
             
-            storm::expressions::Expression const& VariablePartition::getExpression(uint_fast64_t expressionIndex) const {
+            storm::expressions::Expression const& LocalExpressionInformation::getExpression(uint_fast64_t expressionIndex) const {
                 return this->expressions[expressionIndex];
             }
 
-            std::ostream& operator<<(std::ostream& out, VariablePartition const& partition) {
+            std::ostream& operator<<(std::ostream& out, LocalExpressionInformation const& partition) {
                 std::vector<std::string> blocks;
                 for (uint_fast64_t index = 0; index < partition.variableBlocks.size(); ++index) {
                     auto const& variableBlock = partition.variableBlocks[index];

src/storage/prism/menu_games/VariablePartition.h → src/storage/prism/menu_games/LocalExpressionInformation.h

@@ -1,5 +1,5 @@
-#ifndef STORM_STORAGE_PRISM_MENU_GAMES_VARIABLEPARTITION_H_
-#define STORM_STORAGE_PRISM_MENU_GAMES_VARIABLEPARTITION_H_
+#ifndef STORM_STORAGE_PRISM_MENU_GAMES_LOCALEXPRESSIONINFORMATION_H_
+#define STORM_STORAGE_PRISM_MENU_GAMES_LOCALEXPRESSIONINFORMATION_H_
 
 #include <unordered_map>
 #include <set>
@@ -13,23 +13,24 @@ namespace storm {
     namespace prism {
         namespace menu_games {
             
-            class VariablePartition{
+            class LocalExpressionInformation {
             public:
                 /*!
                  * Constructs a new variable partition.
                  *
                  * @param relevantVariables The variables of this partition.
-                 * @param expressions The (initial) expressions that define the partition.
+                 * @param expressionIndexPairs The (initial) pairs of expressions and their global indices.
                  */
-                VariablePartition(std::set<storm::expressions::Variable> const& relevantVariables, std::vector<storm::expressions::Expression> const& expressions = std::vector<storm::expressions::Expression>());
+                LocalExpressionInformation(std::set<storm::expressions::Variable> const& relevantVariables, std::vector<std::pair<storm::expressions::Expression, uint_fast64_t>> const& expressionIndexPairs = {});
                 
                 /*!
                  * Adds the expression and therefore indirectly may cause blocks of variables to be merged.
                  *
                  * @param expression The expression to add.
+                 * @param globalExpressionIndex The global index of the expression.
                  * @return True iff the partition changed.
                  */
-                bool addExpression(storm::expressions::Expression const& expression);
+                bool addExpression(storm::expressions::Expression const& expression, uint_fast64_t globalExpressionIndex);
                 
                 /*!
                  * Retrieves whether the two given variables are in the same block of the partition.
@@ -128,7 +129,7 @@ namespace storm {
                  */
                 storm::expressions::Expression const& getExpression(uint_fast64_t expressionIndex) const;
                 
-                friend std::ostream& operator<<(std::ostream& out, VariablePartition const& partition);
+                friend std::ostream& operator<<(std::ostream& out, LocalExpressionInformation const& partition);
                 
             private:
                 /*!
@@ -153,14 +154,17 @@ namespace storm {
                 // A mapping from variables to the indices of all expressions they appear in.
                 std::unordered_map<storm::expressions::Variable, std::set<uint_fast64_t>> variableToExpressionsMapping;
                 
+                // A mapping from global expression indices to local ones.
+                std::unordered_map<uint_fast64_t, uint_fast64_t> globalToLocalIndexMapping;
+                
                 // The vector of all expressions.
                 std::vector<storm::expressions::Expression> expressions;
             };
             
-            std::ostream& operator<<(std::ostream& out, VariablePartition const& partition);
+            std::ostream& operator<<(std::ostream& out, LocalExpressionInformation const& partition);
             
         }
     }
 }
 
-#endif /* STORM_STORAGE_PRISM_MENU_GAMES_VARIABLEPARTITION_H_ */
+#endif /* STORM_STORAGE_PRISM_MENU_GAMES_LOCALEXPRESSIONINFORMATION_H_ */

src/storage/prism/menu_games/StateSetAbstractor.cpp

@@ -13,10 +13,10 @@ namespace storm {
         namespace menu_games {
             
             template <storm::dd::DdType DdType, typename ValueType>
-            StateSetAbstractor<DdType, ValueType>::StateSetAbstractor(AbstractionExpressionInformation& expressionInformation, AbstractionDdInformation<DdType, ValueType> const& ddInformation, std::vector<storm::expressions::Expression> const& statePredicates, storm::utility::solver::SmtSolverFactory const& smtSolverFactory) : smtSolver(smtSolverFactory.create(expressionInformation.getManager())), expressionInformation(expressionInformation), ddInformation(ddInformation), variablePartition(expressionInformation.getVariables()), relevantPredicatesAndVariables(), concretePredicateVariables(), needsRecomputation(false), cachedBdd(ddInformation.manager->getBddZero()), constraint(ddInformation.manager->getBddOne()) {
+            StateSetAbstractor<DdType, ValueType>::StateSetAbstractor(AbstractionExpressionInformation& globalExpressionInformation, AbstractionDdInformation<DdType, ValueType> const& ddInformation, std::vector<storm::expressions::Expression> const& statePredicates, storm::utility::solver::SmtSolverFactory const& smtSolverFactory) : smtSolver(smtSolverFactory.create(globalExpressionInformation.getManager())), globalExpressionInformation(globalExpressionInformation), ddInformation(ddInformation), localExpressionInformation(globalExpressionInformation.getVariables()), relevantPredicatesAndVariables(), concretePredicateVariables(), needsRecomputation(false), cachedBdd(ddInformation.manager->getBddZero()), constraint(ddInformation.manager->getBddOne()) {
                 
                 // Assert all range expressions to enforce legal variable values.
-                for (auto const& rangeExpression : expressionInformation.getRangeExpressions()) {
+                for (auto const& rangeExpression : globalExpressionInformation.getRangeExpressions()) {
                     smtSolver->add(rangeExpression);
                 }
                 
@@ -27,12 +27,12 @@ namespace storm {
                     // Extract the variables of the predicate, so we know which variables were used when abstracting.
                     std::set<storm::expressions::Variable> usedVariables = predicate.getVariables();
                     concretePredicateVariables.insert(usedVariables.begin(), usedVariables.end());
-                    variablePartition.relate(usedVariables);
+                    localExpressionInformation.relate(usedVariables);
                 }
                 
                 // Refine the command based on all initial predicates.
-                std::vector<uint_fast64_t> allPredicateIndices(expressionInformation.getPredicates().size());
-                for (auto index = 0; index < expressionInformation.getPredicates().size(); ++index) {
+                std::vector<uint_fast64_t> allPredicateIndices(globalExpressionInformation.getPredicates().size());
+                for (auto index = 0; index < globalExpressionInformation.getPredicates().size(); ++index) {
                     allPredicateIndices[index] = index;
                 }
                 this->refine(allPredicateIndices);
@@ -40,10 +40,10 @@ namespace storm {
             
             template <storm::dd::DdType DdType, typename ValueType>
             void StateSetAbstractor<DdType, ValueType>::addMissingPredicates(std::set<uint_fast64_t> const& newRelevantPredicateIndices) {
-                std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>> newPredicateVariables = AbstractionDdInformation<DdType, ValueType>::declareNewVariables(expressionInformation.getManager(), relevantPredicatesAndVariables, newRelevantPredicateIndices);
+                std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>> newPredicateVariables = AbstractionDdInformation<DdType, ValueType>::declareNewVariables(globalExpressionInformation.getManager(), relevantPredicatesAndVariables, newRelevantPredicateIndices);
                 
                 for (auto const& element : newPredicateVariables) {
-                    smtSolver->add(storm::expressions::iff(element.first, expressionInformation.getPredicates()[element.second]));
+                    smtSolver->add(storm::expressions::iff(element.first, globalExpressionInformation.getPredicates()[element.second]));
                     decisionVariables.push_back(element.first);
                 }
                 
@@ -55,7 +55,7 @@ namespace storm {
             void StateSetAbstractor<DdType, ValueType>::refine(std::vector<uint_fast64_t> const& newPredicates) {
                 // Make the partition aware of the new predicates, which may make more predicates relevant to the abstraction.
                 for (auto const& predicateIndex : newPredicates) {
-                    variablePartition.addExpression(expressionInformation.getPredicates()[predicateIndex]);
+                    localExpressionInformation.addExpression(globalExpressionInformation.getPredicateByIndex(predicateIndex), predicateIndex);
                 }
                 needsRecomputation = true;
             }
@@ -86,7 +86,7 @@ namespace storm {
             template <storm::dd::DdType DdType, typename ValueType>
             void StateSetAbstractor<DdType, ValueType>::recomputeCachedBdd() {
                 // Now check whether we need to recompute the cached BDD.
-                std::set<uint_fast64_t> newRelevantPredicateIndices = variablePartition.getRelatedExpressions(concretePredicateVariables);
+                std::set<uint_fast64_t> newRelevantPredicateIndices = localExpressionInformation.getRelatedExpressions(concretePredicateVariables);
                 STORM_LOG_TRACE("Found " << newRelevantPredicateIndices.size() << " relevant predicates in abstractor.");
                 
                 // Since the number of relevant predicates is monotonic, we can simply check for the size here.
@@ -135,7 +135,7 @@ namespace storm {
                 smtSolver->push();
                 
                 // Then add the constraint.
-                std::pair<std::vector<storm::expressions::Expression>, std::unordered_map<std::pair<uint_fast64_t, uint_fast64_t>, storm::expressions::Variable>> result = constraint.toExpression(expressionInformation.getManager(), ddInformation.bddVariableIndexToPredicateMap);
+                std::pair<std::vector<storm::expressions::Expression>, std::unordered_map<std::pair<uint_fast64_t, uint_fast64_t>, storm::expressions::Variable>> result = constraint.toExpression(globalExpressionInformation.getManager(), ddInformation.bddVariableIndexToPredicateMap);
                 
                 for (auto const& expression : result.first) {
                     smtSolver->add(expression);

src/storage/prism/menu_games/StateSetAbstractor.h

@@ -11,7 +11,7 @@
 
 #include "src/solver/SmtSolver.h"
 
-#include "src/storage/prism/menu_games/VariablePartition.h"
+#include "src/storage/prism/menu_games/LocalExpressionInformation.h"
 
 namespace storm {
     namespace utility {
@@ -115,14 +115,14 @@ namespace storm {
                 // The SMT solver used for abstracting the set of states.
                 std::unique_ptr<storm::solver::SmtSolver> smtSolver;
                 
-                // The expression-related information.
-                AbstractionExpressionInformation& expressionInformation;
+                // The global expression-related information.
+                AbstractionExpressionInformation& globalExpressionInformation;
                 
                 // The DD-related information.
                 AbstractionDdInformation<DdType, ValueType> const& ddInformation;
                 
-                // The partition of the variables.
-                VariablePartition variablePartition;
+                // The local expression-related information.
+                LocalExpressionInformation localExpressionInformation;
                 
                 // The set of relevant predicates and the corresponding decision variables.
                 std::vector<std::pair<storm::expressions::Variable, uint_fast64_t>> relevantPredicatesAndVariables;