protected override Expression VisitChildren(ExpressionVisitor visitor)
{
// generate try block
var tryBody = visitor.Visit(Wrap(Content.Body));
tryBody = tryBody.AddPrologue(false, prologue);
if (!(finallyLabel is null))
{
tryBody = tryBody.AddEpilogue(false, finallyLabel.Goto(), FaultLabel.LandingSite());
}
// generate exception handlers block
var handlers = new LinkedList <Expression>();
if (finallyLabel != null)
{
handlers.AddLast(new ExitGuardedCodeExpression(previousState, false));
handlers.AddLast(new EnterGuardedCodeExpression(recoveryStateId));
foreach (var handler in Content.Handlers)
{
handlers.AddLast(visitor.Visit(new CatchStatement(handler, finallyLabel)));
}
}
// generate finally block
Expression fault = new FinallyStatement(Content.Finally ?? Content.Fault, previousState, finallyLabel ?? FaultLabel);
fault = visitor.Visit(fault);
return(tryBody.AddEpilogue(false, handlers).AddEpilogue(false, fault));
}
protected override Expression VisitChildren(ExpressionVisitor visitor)
{
var filter = visitor.Visit(this.filter);
if (ExpressionAttributes.Get(filter)?.ContainsAwait ?? false)
{
throw new NotSupportedException(ExceptionMessages.FilterHasAwait);
}
var handler = visitor.Visit(Content);
handler = handler.AddPrologue(false, prologue).AddEpilogue(false, epilogue).AddEpilogue(false, FaultLabel.Goto());
return(IfThen(filter, handler));
}