Le 25 mars 2010 à 18:10, John Rose a écrit :
> On Mar 25, 2010, at 8:43 AM, Attila Szegedi wrote:
>
>> You'll get java.dyn.NoAccessException in more generic cases too, i.e. if.
>> MethodHandles.findStatic/Virtual/Special fails to find a method of the
>> expected signature etc.
>
> Thanks, Attila.
>
> The JSR 292 RI is still underdevelopment. See yesterday's message for status
> related to javadoc and invokeGeneric:
>
> http://mail.openjdk.java.net/pipermail/mlvm-dev/2010-March/001591.html
>
> The invokeGeneric method, currently, should be treated as an alias for
> invokeExact until I get a little more JVM plumbing done. Until then, if you
> want to write a simple generic invocation, and are willing to tolerate boxing
> overheads in exchange, use MethodHandle.invokeVarargs.
>
> Xavier, the draft javadoc is posted here, and was just updated yesterday:
>
> http://cr.openjdk.java.net/~jrose/pres/indy-javadoc-mlvm/
>
> It includes an account of the associated changes to the classfile format,
> too. See the package-info page for java.dyn.
Thanks to both of you for the additional information, and pointers.
However, I am still missing something - probably obvious.
In the application I am working on, the Java 1.6 perfectly-working code
contains the following line:
return (Value) this.implementations[prim].invoke(null,
(java.lang.Object[]) params);
And I would expect the following Java 1.7 line to be equivalent but it raises
the aforementioned exception:
return (Value)
MethodHandles.lookup().unreflect(this.implementations[prim]).invokeVarargs((java.lang.Object[])
params);
Also notice, that the following line do not raise any exception:
MethodHandles.lookup().unreflect(this.implementations[prim]);
The environment of this line is as follows:
- "this.implementations" has a type equal to "Method[]";
- "params" has a type equal to "Value[]" ("Value" being an
application-specific type);
- "prim" has obviously its type equal to "int".
Sorry to keep posting on this thread, but I am really having a hard time
figuring out what is going on.
Thanks for your patience,
Xavier Clerc
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