public static void PopulateMethod(ITranslationErrorHandler handler, Function fun)
{
if (fun.Body != null)
{
return;
}
var visitor = new FunctionBodyVisitor(handler, fun.Owner, fun);
visitor.Visit(fun.SourceLocation);
}
public override IPStmt VisitReceiveStmt(PParser.ReceiveStmtContext context)
{
// TODO: can receive statements have event variables as their cases?
var cases = new Dictionary <PEvent, Function>();
foreach (PParser.RecvCaseContext caseContext in context.recvCase())
{
var recvHandler =
new Function(caseContext.anonEventHandler())
{
Scope = table.MakeChildScope(),
Owner = method.Owner,
Role = FunctionRole.ReceiveHandler
};
if (caseContext.anonEventHandler().funParam() is PParser.FunParamContext param)
{
Variable 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 (PParser.EventIdContext 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.IssueError(eventIdContext, $"duplicate case for event {pEvent.Name} in receive");
}
PLanguageType expectedType =
recvHandler.Signature.ParameterTypes.ElementAtOrDefault(0) ?? PrimitiveType.Null;
if (!expectedType.IsAssignableFrom(pEvent.PayloadType))
{
throw handler.TypeMismatch(caseContext.anonEventHandler().funParam(), expectedType,
pEvent.PayloadType);
}
cases.Add(pEvent, recvHandler);
}
}
return(new ReceiveStmt(context, cases));
}
public static Scope AnalyzeCompilationUnit(ITranslationErrorHandler handler, params PParser.ProgramContext[] programUnits)
{
// Step 1: Build the global scope of declarations
Scope globalScope = BuildGlobalScope(handler, programUnits);
// Step 2: Validate machine specifications
foreach (Machine machine in globalScope.Machines)
{
Validator.ValidateMachine(handler, machine);
}
// Step 3: Fill function bodies
List <Function> allFunctions = AllFunctions(globalScope).ToList();
foreach (Function machineFunction in allFunctions)
{
FunctionBodyVisitor.PopulateMethod(handler, machineFunction);
}
// Step 4: Propagate purity properties
ApplyPropagations(allFunctions,
CreatePropagation(fn => fn.CanCommunicate, (fn, value) => fn.CanCommunicate = value,
true),
CreatePropagation(fn => fn.CanChangeState, (fn, value) => fn.CanChangeState = value,
true));
// Step 5: Verify purity invariants
foreach (Function machineFunction in allFunctions)
{
if (machineFunction.Owner?.IsSpec == true && machineFunction.IsNondeterministic == true)
{
throw handler.NonDeterministicFunctionInSpecMachine(machineFunction);
}
if (machineFunction.CanChangeState == 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);
return(globalScope);
}