public override IPStmt VisitGotoStmt(PParser.GotoStmtContext context)
{
PParser.StateNameContext stateNameContext = context.stateName();
string stateName = stateNameContext.state.GetText();
IStateContainer current = machine;
foreach (PParser.IdenContext token in stateNameContext._groups)
{
current = current?.GetGroup(token.GetText());
if (current == null)
{
throw handler.MissingDeclaration(token, "group", token.GetText());
}
}
AST.States.State state = current?.GetState(stateName);
if (state == null)
{
throw handler.MissingDeclaration(stateNameContext.state, "state", stateName);
}
PLanguageType expectedType =
state.Entry?.Signature.ParameterTypes.ElementAtOrDefault(0) ?? PrimitiveType.Null;
IPExpr[] rvaluesList = TypeCheckingUtils.VisitRvalueList(context.rvalueList(), exprVisitor).ToArray();
foreach (IPExpr arg in rvaluesList)
{
if (arg is LinearAccessRefExpr linearArg && linearArg.LinearType == LinearType.Swap)
{
throw handler.InvalidSwap(linearArg, "swap not allowed on goto");
}
}
IPExpr payload;
if (rvaluesList.Length == 0)
{
payload = null;
}
else if (rvaluesList.Length == 1)
{
payload = rvaluesList[0];
}
else
{
payload = new UnnamedTupleExpr(context, rvaluesList);
}
PLanguageType payloadType = payload?.Type ?? PrimitiveType.Null;
if (!expectedType.IsAssignableFrom(payloadType))
{
throw handler.TypeMismatch(context, payloadType, expectedType);
}
method.CanChangeState = true;
return(new GotoStmt(context, state, payload));
}
public override IPStmt VisitGotoStmt(PParser.GotoStmtContext context)
{
PParser.StateNameContext stateNameContext = context.stateName();
string stateName = stateNameContext.state.GetText();
IStateContainer current = machine;
foreach (PParser.IdenContext token in stateNameContext._groups)
{
current = current?.GetGroup(token.GetText());
if (current == null)
{
throw handler.MissingDeclaration(token, "group", token.GetText());
}
}
State state = current?.GetState(stateName);
if (state == null)
{
throw handler.MissingDeclaration(stateNameContext.state, "state", stateName);
}
IPExpr payload = null;
PLanguageType expectedType =
state.Entry.Signature.ParameterTypes.ElementAtOrDefault(0) ?? PrimitiveType.Null;
if (context.rvalueList()?.rvalue() is PParser.RvalueContext[] rvalues)
{
if (rvalues.Length == 1)
{
payload = exprVisitor.Visit(rvalues[0]);
}
else
{
IPExpr[] tupleFields = rvalues.Select(exprVisitor.Visit).ToArray();
payload = new UnnamedTupleExpr(context, tupleFields,
new TupleType(tupleFields.Select(f => f.Type).ToList()));
}
}
PLanguageType payloadType = payload?.Type ?? PrimitiveType.Null;
if (!expectedType.IsAssignableFrom(payloadType))
{
throw handler.TypeMismatch(context, payloadType, expectedType);
}
return(new GotoStmt(context, state, payload));
}
private State FindState(PParser.StateNameContext context)
{
var scope = CurrentMachine.Scope;
foreach (var groupToken in context._groups)
{
if (!scope.Get(groupToken.GetText(), out StateGroup group))
{
throw Handler.MissingDeclaration(groupToken, "group", groupToken.GetText());
}
scope = group.Scope;
}
if (!scope.Get(context.state.GetText(), out State state))
{
throw Handler.MissingDeclaration(context.state, "state", context.state.GetText());
}
return(state);
}
