Support Java numeric literals in @Params parameters

[Aleksey Shipilev]

Hi,

On 10/26/20 9:50 AM, Vsevolod Tolstopyatov wrote:
> ```
> @Param({"100", "1000", "10_000"})
> int integerParam = 10_000
> ```

As the workaround, you can write:

   @Param({"" + 100, "" + 1_000, "" + 10_000})
   int integerParam = 10_000

I understand this is ugly.

> It feels inconsistent and also complicates eye-balling parameters,
> especially when they are the power of 10.
> It would be nice to support underscores (generally speaking, to support
> integer literals in the same way javac does) and I am willing to contribute
> it, but first I would like to ask whether such change is aligned with JMH
> API shape and is a reasonable addition to JMH at all.

Well, I remember discussions (or maybe even the patches) about doing this. When JMH still supported 
JDK 6, supporting underscores was at odds with source/target=6. It does not seem to be an issue 
anymore: the minimal target is 7, so underscored literals are already there.

You can draft up a PR, and we shall see if there are blank spots.

-- 
Thanks,
-Aleksey