some more fixes to jit model builder

src/storm/builder/jit/ExplicitJitJaniModelBuilder.cpp

@@ -1322,7 +1322,11 @@ namespace storm {
                     ++destinationIndex;
                 }
                 
-                edgeData["guard"] = expressionTranslator.translate(shiftVariablesWrtLowerBound(edge.getGuard()) && getLocationVariable(automaton) == model.getManager().integer(edge.getSourceLocationIndex()), storm::expressions::ToCppTranslationOptions(variablePrefixes, variableToName));
+                if (automaton.getNumberOfLocations() > 1) {
+                    edgeData["guard"] = expressionTranslator.translate(shiftVariablesWrtLowerBound(edge.getGuard()) && getLocationVariable(automaton) == model.getManager().integer(edge.getSourceLocationIndex()), storm::expressions::ToCppTranslationOptions(variablePrefixes, variableToName));
+                } else {
+                    edgeData["guard"] = expressionTranslator.translate(shiftVariablesWrtLowerBound(edge.getGuard()), storm::expressions::ToCppTranslationOptions(variablePrefixes, variableToName));
+                }
                 edgeData["destinations"] = cpptempl::make_data(destinations);
                 edgeData["name"] = automaton.getName() + "_" + std::to_string(edgeIndex);
                 edgeData["transient_assignments"] = cpptempl::make_data(edgeAssignments);
@@ -1399,12 +1403,14 @@ namespace storm {
                     
                     // Close the last (open) level.
                     cpptempl::data_map level;
-                    nonTransientAssignmentData.push_back(generateLocationAssignment(automaton, destinationLocationIndex));
+                    if (automaton.getNumberOfLocations() > 1) {
+                        nonTransientAssignmentData.push_back(generateLocationAssignment(automaton, destinationLocationIndex));
+                    }
                     level["non_transient_assignments"] = cpptempl::make_data(nonTransientAssignmentData);
                     level["transient_assignments"] = cpptempl::make_data(transientAssignmentData);
                     level["index"] = asString(currentLevel);
                     levels.push_back(level);
-                } else {
+                } else if (automaton.getNumberOfLocations() > 1) {
                     // Create (an otherwise) empty level to perform the location assignment.
                     cpptempl::data_map level;
                     cpptempl::data_list nonTransientAssignmentData;

src/storm/parser/JaniParser.cpp

@@ -1013,7 +1013,7 @@ namespace storm {
                 STORM_LOG_THROW(locIds.count(sourceLoc) == 1, storm::exceptions::InvalidJaniException, "Source of edge has unknown location '" << sourceLoc << "' in automaton '" << name << "'.");
                 // action
                 STORM_LOG_THROW(edgeEntry.count("action") < 2, storm::exceptions::InvalidJaniException, "Edge from " << sourceLoc << " in automaton " << name << " has multiple actions");
-                std::string action = ""; // def is tau
+                std::string action = storm::jani::Model::SILENT_ACTION_NAME; // def is tau
                 if(edgeEntry.count("action") > 0) {
                     action = getString(edgeEntry.at("action"), "action name in edge from '" + sourceLoc + "' in automaton '" + name + "'");
                     // TODO check if action is known
@@ -1077,8 +1077,6 @@ namespace storm {
                 automaton.addEdge(storm::jani::Edge(locIds.at(sourceLoc), parentModel.getActionIndex(action), rateExpr.isInitialized() ? boost::optional<storm::expressions::Expression>(rateExpr) : boost::none, guardExpr, edgeDestinations));
             }
 
-
-
             return automaton;
         }
         

src/storm/storage/jani/Model.cpp

@@ -14,7 +14,7 @@
 namespace storm {
     namespace jani {
         
-        const std::string Model::SILENT_ACTION_NAME = "";
+        const std::string Model::SILENT_ACTION_NAME = "__SILENT_ACTION__";
         const uint64_t Model::SILENT_ACTION_INDEX = 0;
         
         Model::Model() {