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

[Michael Haupt]

Hi Claes,

thumbs up.

Best,

Michael

> Am 17.08.2016 um 23:33 schrieb Claes Redestad <claes.redestad at oracle.com>:
> 
> 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

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