RFR: 8164044: Generate corresponding simple DelegatingMethodHandles when generating a DirectMethodHandle

[Vladimir Ivanov]

Good work! Reviewed.

Best regards,
Vladimir Ivanov

PS: I wish LF.debugString completely went away, but let's keep it for 
future cleanup.

On 8/18/16 12:33 AM, Claes Redestad wrote:
> Hi,
>
> please review this change which adds pre-generation of simple
> DelegatingMethodHandles corresponding to the DirectMethodHandles we
> already pre-generate during linking.
>
> webrev: http://cr.openjdk.java.net/~redestad/8164044/webrev.02/
> bug: https://bugs.openjdk.java.net/browse/JDK-8164044
>
> This also includes some cleanup suggested by Vladimir during internal
> review, such as:
>
> - adding an enum to control this behavior, which allows removing the
> special version of LF.compileToBytecode introduced by JDK-8163369
> - refactored resolution of pregenerated code to the
> InvokerBytecodeGenerator
> - removing reliance on the LF.debugName (which we have some loose ideas
> to remove from LF and tuck away in a map we only create and initialize
> when actually debugging).
>
> This patch removes 11 out of the 39 classes generated on first use of
> the StringConcatFactory in a simple test, amounting to a ~10ms speedup
> on my machine.
>
> Thanks!
>
> /Claes