RFR(S): 8160717: MethodHandles.loop() does not check for excessive signature

Michael Haupt michael.haupt at oracle.com
Wed Jul 6 12:55:16 UTC 2016

Hi Claes,

> Am 06.07.2016 um 13:31 schrieb Claes Redestad <claes.redestad at oracle.com>:
>>> I'll let Claes comment on the broader PerfCounter question, as he suggested using them. I think PerfCounter is a convenient abstraction for what we want to achieve, but the way it's used here may smell a bit abusive.
>> Ok.
> I know of a number of Java-side PerfCounters created early (and they're rather lean on dependencies in the first place, a select number of j.u.c.atomic classes IIRC), so I wouldn't worry about much of a startup penalty here.
> Lazy initialization might not save us much, and would hide the counter from showing up.
> I guess what I'm saying is I'm good with webrev.00. :-)

thank you - some sensible improvements notwithstanding; see http://cr.openjdk.java.net/~mhaupt/8160717/webrev.01/.

>> A wild thought: is there anyway to add some context/data to the ASM processing indicating what intrinsic is being processed, so when you get the exception you can at least differentiate.
> While out of scope for this change, maybe we should seek to improve robustness by asking the ASM project to add more distinctive exceptions, say, create a MethodTooLargeException or similar, in which case we could change the catch to be more specific.

Four thumbs up: domain-specific meaningful exceptions are A Good Thing.




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