Johann MacDonagh wrote:
> On 12/27/07, Bruce Markham <[EMAIL PROTECTED]> wrote:
>
>> I know my brain is frazzled, which it is most nights at 3am, even when I
>> haven't been reading PCI specifications all day.
>>
>> But I do know, that if compile Assembly A with Generic Type 1. And Assembly
>> B with Normal Type 2 that uses Generic Type 1, it won't be able to
>> re-compile its own version of Generic Type 1 because Generic Type 1 will be
>> machine language on the disk.
>>
>> And unless you want all programs to take up twice as much HDD because you
>> want to have both IL and machine language sitting around, it doesn't scale
>> well. (Especially if you have embedded resources.)
>>
>
> So,
>
> Assembly 1:
> public class SomeType
> {
> public int i;
> }
>
> Assembly 2:
> public class SomeType2<SomeType>
> {
> }
>
> What you're saying is that after Assembly 1 was AOTed, and then
> Assembly 2 was AOTed, it would be impossible to change the class
> SomeType without having to re-AOT Assembly 2?
>
> I think it's possible. When we AOT SomeType2, we shouldn't statically
> embed information about SomeType into it at all. Simple a pointer.
>
> But I suppose this brings up a lot of issues. Let's say we have this:
>
> Assembly 1:
> public class Type1
> {
> int i = 5;
> }
>
> Assembly 2
> public class Program
> {
> public static int Main(string[] args)
> {
> Type1 a = new Type1();
> a.i = 100;
> }
> }
>
> and we AOT both of them. Now, if we change the definition of Type1,
> let's say we get rid of the field i and replace it with a field j,
> then Assembly 2 would have to be able to throw a runtime exception. If
> we can do that, then I don't think there's any problem with AOTing
> generic types.
>
> Johann
>
>
Yes, essentially (once compiled):
public class MyGenericClass
{
void * value;
Type t;
public void * DoSomething()
{
value = Activator.CreateInstance(t);
return value;
}
}
And in the class using it:
public static void Main
{
MyGenericClass c = new MyGenericClass();
c.t = typeof(FooClass); // AOT inserts this.
FooClass a = (FooClass) c.DoSomething(); // AOT inserts cast.
}
--
Jonathan Dickinson
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