RFR: 8265135: Reduce work initializing VarForms

[Claes Redestad]

On Tue, 13 Apr 2021 23:09:12 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> This patch reduces work done initializing VarForms - mostly observed when loading each VarHandle implementation class.
>> 
>> - Lazily resolve MemberNames.
>> - Streamline MethodType creation. This reduces the number of MethodTypes created. 
>> 
>> Net effect is a reduction in bytecode executed per VH class by 50-60%.
>
> src/java.base/share/classes/java/lang/invoke/VarForm.java line 130:
> 
>> 128:         } catch (NoSuchMethodException | IllegalAccessException e) {
>> 129:             throw new UnsupportedOperationException();
>> 130:         }
> 
> Suggestion:
> 
>         } catch (ReflectiveOperationException e) {
>                 throw newInternalError("Failed resolving VarHandle member name", ex);
>         }

Thanks for reviewing!

Is there's a way to provoke this exception through the public API? If not then the suggested behavior change seems reasonable.

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PR: https://git.openjdk.java.net/jdk/pull/3472