TryCatch - Bad label content in ILGenerator

[snakex64]

Hi!

I keep getting "Bad label content in ILGenerator" when I try to compile a small try..catch expression, either I get it directly when I call "CompileFast" or I get it when I try to create the type if I use it with "CompileFastToIL".

The issue seems to be around the "return 10" inside the "Catch". It does the same behavior if I "return" inside the "try".

I have been trying to compile an expression that represent represent something like this:

try{
    Call();
}
catch(Exception)
{
    return 10;
}
Call();
return 1;

I wrote this tiny demo Expression to replicate the issue:

var returnLabelTarget = Expression.Label(typeof(int), "ReturnLabel");

var tryBody = Expression.Call(typeof(Console).GetMethod("Clear")!);
var catchBody = Expression.Return(returnLabelTarget, Expression.Constant(10));

var tryCatch = Expression.TryCatch(tryBody, Expression.Catch(typeof(Exception), catchBody));

var afterCatch = Expression.Block(
	Expression.Call(typeof(Console).GetMethod("Clear")!),
	Expression.Return(returnLabelTarget, Expression.Constant(5)),
	Expression.Label(returnLabelTarget, Expression.Constant(0)));

var body = Expression.Block(tryCatch, afterCatch);

var expression = Expression.Lambda(body);

var v = expression.CompileFast();

Any idea what I'm doing wrong?

[dadhi]

Thanks for reporting. I will check.

[dadhi]

I have repro the bug.
But in order to do that I was needed to change your expression, as it is not passing the normal validation.
Check the valid test expression here 9c8c2e4

[snakex64]

I have repro the bug. But in order to do that I was needed to change your expression, as it is not passing the normal validation. Check the valid test expression here 9c8c2e4

Amazing, thank you! Huge thanks for the whole library too. It completely saved me when I realized that Microsoft removed the "CompileToMethod" in .NET Core. I'm using this in a visual programming environment project, couldn't do it without your library

https://imgur.com/a/nlkfLLw