public override IPStmt VisitReceiveStmt(PParser.ReceiveStmtContext context)
{
if (machine?.IsSpec == true)
{
throw handler.IllegalMonitorOperation(context, context.RECEIVE().Symbol, machine);
}
var cases = new Dictionary <PEvent, Function>();
foreach (var caseContext in context.recvCase())
{
var recvHandler =
new Function(caseContext.anonEventHandler())
{
Scope = table.MakeChildScope(),
Owner = method.Owner,
ParentFunction = method,
Role = FunctionRole.ReceiveHandler
};
if (caseContext.anonEventHandler().funParam() is PParser.FunParamContext param)
{
var paramVar = recvHandler.Scope.Put(param.name.GetText(), param, VariableRole.Param);
paramVar.Type = TypeResolver.ResolveType(param.type(), recvHandler.Scope, handler);
recvHandler.Signature.Parameters.Add(paramVar);
}
FunctionBodyVisitor.PopulateMethod(handler, recvHandler);
foreach (var eventIdContext in caseContext.eventList().eventId())
{
if (!table.Lookup(eventIdContext.GetText(), out PEvent pEvent))
{
throw handler.MissingDeclaration(eventIdContext, "event", eventIdContext.GetText());
}
if (cases.ContainsKey(pEvent))
{
throw handler.DuplicateReceiveCase(eventIdContext, pEvent);
}
var expectedType =
recvHandler.Signature.ParameterTypes.ElementAtOrDefault(0) ?? PrimitiveType.Null;
if (!expectedType.IsAssignableFrom(pEvent.PayloadType))
{
throw handler.TypeMismatch(caseContext.anonEventHandler(), expectedType,
pEvent.PayloadType);
}
cases.Add(pEvent, recvHandler);
}
}
method.CanReceive = true;
return(new ReceiveStmt(context, cases));
}
public static Scope AnalyzeCompilationUnit(ITranslationErrorHandler handler,
params PParser.ProgramContext[] programUnits)
{
// Step 1: Build the global scope of declarations
var globalScope = BuildGlobalScope(handler, programUnits);
// Step 2: Validate machine specifications
foreach (var machine in globalScope.Machines)
{
MachineChecker.Validate(handler, machine);
}
// Step 3: Fill function bodies
var allFunctions = globalScope.GetAllMethods().ToList();
foreach (var machineFunction in allFunctions)
{
FunctionBodyVisitor.PopulateMethod(handler, machineFunction);
FunctionValidator.CheckAllPathsReturn(handler, machineFunction);
}
// Step 2: Validate no static handlers
foreach (var machine in globalScope.Machines)
{
MachineChecker.ValidateNoStaticHandlers(handler, machine);
}
// Step 4: Propagate purity properties
ApplyPropagations(allFunctions,
CreatePropagation(fn => fn.CanRaiseEvent, (fn, value) => fn.CanRaiseEvent = value,
true),
CreatePropagation(fn => fn.CanReceive, (fn, value) => fn.CanReceive = value,
true),
CreatePropagation(fn => fn.CanChangeState, (fn, value) => fn.CanChangeState = value,
true));
// Step 5: Verify capability restrictions
foreach (var machineFunction in allFunctions)
{
// TODO: is this checked earlier?
if (machineFunction.Owner?.IsSpec == true && machineFunction.IsNondeterministic == true)
{
throw handler.NonDeterministicFunctionInSpecMachine(machineFunction);
}
if ((machineFunction.CanChangeState == true || machineFunction.CanRaiseEvent == true) &&
(machineFunction.Role.HasFlag(FunctionRole.TransitionFunction) ||
machineFunction.Role.HasFlag(FunctionRole.ExitHandler)))
{
throw handler.ChangedStateMidTransition(machineFunction.SourceLocation, machineFunction);
}
}
// Step 6: Check linear type ownership
LinearTypeChecker.AnalyzeMethods(handler, allFunctions);
// Step 7: Check control flow well-formedness
ControlFlowChecker.AnalyzeMethods(handler, allFunctions);
// Step 8: Infer the creates set for each machine.
foreach (var machine in globalScope.Machines)
{
InferMachineCreates.Populate(machine, handler);
}
// Step 9: Fill the module expressions
ModuleSystemDeclarations.PopulateAllModuleExprs(handler, globalScope);
var moduleTypeChecker = new ModuleSystemTypeChecker(handler, globalScope);
// Step 10: Check that all module expressions are well-formed
foreach (var moduleExpr in AllModuleExprs(globalScope))
{
moduleTypeChecker.CheckWellFormedness(moduleExpr);
}
// Step 11: Check the test and implementation declarations
foreach (var impl in globalScope.Implementations)
{
moduleTypeChecker.CheckImplementationDecl(impl);
}
foreach (var test in globalScope.SafetyTests)
{
moduleTypeChecker.CheckSafetyTest(test);
}
foreach (var test in globalScope.RefinementTests)
{
moduleTypeChecker.CheckRefinementTest(test);
}
return(globalScope);
}
