RFR: 8355442: Reference field lambda forms with type casts are not generated

[Chen Liang]

On Fri, 25 Apr 2025 20:30:15 GMT, Chen Liang <liach at openjdk.org> wrote:

> Currently, we are not generating all possible field lambda forms.
> 
> Field lambda forms have these dimensions:
> - get/set
> - instance/static/static+class init barrier
> - plain/volatile
> - 8 primitive types, no-cast object, object with cast
> 
> Bringing to a total of 2 × 3 × 2 × 10 = 120 lambda forms.
> 
> Previously, the ones with init barrier or object with cast types were not generated due to spamming the Kind enum. In retrospect, I believe skipping the object with cast form is a poor choice - tons of Java fields are using non-interface types. Also seems the volatile accessors were omitted in InvokerBytecodeGenerator, which made their pregen useless.
> 
> I have utilized erased method types to distinguish forms - get/set, 5 basic types, and instance/static can be distinguished by the types, so the Kind enums now only represent init, volatile, and non-basic types (byte, char, short, boolean, casts), bringing the total constants to 24 down from 40 previously.
> 
> In the long run, we should investigate update `Kind` to allow flexible representations - an enum is too restrictive especially with the erased types.

Testing: tier 1-3, one intermittent Jshell failure in tier1

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PR Comment: https://git.openjdk.org/jdk/pull/24887#issuecomment-2831517250