[Mono-bugs] [Bug 442122] New: Better handling of read-only method variables which appear in closures.

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=442122


           Summary: Better handling of read-only method variables which
                    appear in closures.
           Product: Mono: Compilers
           Version: 2.0
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Enhancement
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: lunchtimemama at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Test Case:

void Foo(int i)
{
    DoSomethingWithADelagate (() => i != 5);
    DoSomethindWithAnInt (i);
}

Observed Behaviour:

The compiler passes the captured value to DoSomethindWithAnInt. This involves
two IL instructions: ldloc (to load the instance of the compiler-generated
class) and ldfld (to load the captured value).

Expected Behaviour:

Because the argument is never assigned to or used as an out or ref parameter,
it is guaranteed not to change. The compiler should load the argument value
directly with a single ldarg instruction. The same could be done with local
variables that are not assigned to within or after their appearance in an
anonymous method.

Side Note: csc does not have this optimization.


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