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 (Content.Handlers.Count > 0)
{
handlers.AddLast(new ExitGuardedCodeExpression(previousState));
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));
}
private Expression VisitAsyncResult(AsyncResultExpression expr)
{
if (context.IsInFinally)
{
throw new InvalidOperationException(ExceptionMessages.LeavingFinallyClause);
}
//attach all available finalization code
var prologue = context.CurrentStatement.PrologueCodeInserter();
foreach (var finalization in context.CreateJumpPrologue(AsyncMethodEnd.Goto(), this))
{
prologue(finalization);
}
return(expr);
}