/** 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;
}
