Re: Re: Loading int.class onto the stack

  Le 02/02/2011 21:32, Scott Vachalek a écrit :
> Afaik, primitives do not have true Class objects and 
> int.class/Integer.TYPE are just a thin facade to unify the type 
> system.  I wouldn't be surprised that they won't fit into the constant 
> pool as Classes.  Before Java 1.5, even constructs like String.class 
> weren't supported by LDC, they generated a block of code that cached 
> Class.forName().

primitive classes are true Class objects from the VM point of view but
they can't be lookup by classloader/Class.forName(). That why LDC 
int.class doesn't work.

Rémi

>
> On Wed, Feb 2, 2011 at 12:15 PM, Arshan Dabirsiaghi 
> <[email protected] <mailto:[email protected]>> 
> wrote:
>
>     Sorry in advance for what is probably a stupid question.
>
>     How do I load the int.class primitive Class representation (as
>     opposed to Integer.class) via an ldc instruction? I've tried the
>     following:
>
>     visitLdcInsn( Type.getType(int.class) );
>     visitLdcInsn( Type.INT_TYPE );
>     visitLdcInsn( Type.getType("I") );
>
>     These either cause NoClassDefFoundErrors or generate the wrong
>     type (they generate Integer.class instead of int.class).
>
>     The compiler generates GETSTATIC instructions to fetch the
>     int.class indirectly from Integer.TYPE, like for the code show:
>
>     Class[] classes = new Class[]{int.class};
>
>     Emulating this isn't currently causing us any direct issues, but I
>     don't know if it's a good idea or performant when compared to a
>     direct reference to int.class.
>
>     Thanks,
>     Arshan
>
>
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