/** Constructor. */ public PTAModelChecker(Prism prism, ModulesFile modulesFile, PropertiesFile propertiesFile) throws PrismException { this.prism = prism; mainLog = prism.getMainLog(); this.modulesFile = modulesFile; this.propertiesFile = propertiesFile; // Get combined constant values from model/properties constantValues = new Values(); constantValues.addValues(modulesFile.getConstantValues()); if (propertiesFile != null) constantValues.addValues(propertiesFile.getConstantValues()); // Build a combined label list and expand any constants // (note labels in model are ignored (removed) during PTA translation so need to store here) labelList = new LabelList(); for (int i = 0; i < modulesFile.getLabelList().size(); i++) { labelList.addLabel( modulesFile.getLabelList().getLabelNameIdent(i), modulesFile.getLabelList().getLabel(i).deepCopy()); } for (int i = 0; i < propertiesFile.getLabelList().size(); i++) { labelList.addLabel( propertiesFile.getLabelList().getLabelNameIdent(i), propertiesFile.getLabelList().getLabel(i).deepCopy()); } labelList = (LabelList) labelList.replaceConstants(constantValues); // Build mapping from all (original model) variables to non-clocks only int numVars = modulesFile.getNumVars(); nonClockVarMap = new int[numVars]; int count = 0; for (int i = 0; i < numVars; i++) { if (modulesFile.getVarType(i) instanceof TypeClock) { nonClockVarMap[i] = -1; } else { nonClockVarMap[i] = count++; } } }
/** Model check a property. */ public Result check(Expression expr) throws PrismException { Modules2PTA m2pta; Result res; String resultString; long timer; // Starting model checking timer = System.currentTimeMillis(); // Check for system...endsystem - not supported yet if (modulesFile.getSystemDefn() != null) { throw new PrismException( "The system...endsystem construct is not supported yet (try the digital clocks engine instead)"); } // Translate ModulesFile object into a PTA object mainLog.println("\nBuilding PTA..."); m2pta = new Modules2PTA(prism, modulesFile); pta = m2pta.translate(); mainLog.println("\nPTA: " + pta.infoString()); // Check for references to clocks - not allowed (yet) // (do this before modifications below for better error reporting) expr.accept( new ASTTraverseModify() { public Object visit(ExpressionVar e) throws PrismLangException { if (e.getType() instanceof TypeClock) { throw new PrismLangException( "Properties cannot contain references to clocks (try the digital clocks engine instead)", e); } else { return e; } } }); // Take a copy of property, since will modify expr = expr.deepCopy(); // Remove property refs ands labels from property expr = (Expression) expr.expandPropRefsAndLabels(propertiesFile, labelList); // Evaluate constants in property (easier to do now) expr = (Expression) expr.replaceConstants(constantValues); // Also simplify expression to optimise model checking expr = (Expression) expr.simplify(); // Do model checking res = checkExpression(expr); // Model checking complete timer = System.currentTimeMillis() - timer; mainLog.println("\nModel checking completed in " + (timer / 1000.0) + " secs."); // Print result to log resultString = "Result"; if (!("Result".equals(expr.getResultName()))) resultString += " (" + expr.getResultName().toLowerCase() + ")"; resultString += ": " + res; mainLog.print("\n" + resultString + "\n"); // Return result return res; }