RFR: 8286301: Port JEP 425 to RISC-V [v2]

[Fei Yang]

On Wed, 2 Nov 2022 09:03:16 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

>> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix
>
> src/hotspot/cpu/riscv/sharedRuntime_riscv.cpp line 1236:
> 
>> 1234:       guarantee(false, "Unknown Continuation native intrinsic");
>> 1235:     }
>> 1236: 
> 
> aarch64 has some assertions here, do we need this?
> 
> #ifdef ASSERT
>     if (method->is_continuation_enter_intrinsic()) {
>       assert(interpreted_entry_offset != -1, "Must be set");
>       assert(exception_offset != -1,         "Must be set");
>     } else {
>       assert(interpreted_entry_offset == -1, "Must be unset");
>       assert(exception_offset == -1,         "Must be unset");
>     }
>     assert(frame_complete != -1,    "Must be set");
>     assert(stack_slots != -1,       "Must be set");
>     assert(vep_offset != -1,        "Must be set");
> #endif

Good catch. I think I missed this issue: "8293654: Improve SharedRuntime handling of continuation helper out-arguments". I have just added handling for RISC-V. I think this is kind of refactoring work and won't affect basic functionality. Thanks.

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PR: https://git.openjdk.org/jdk/pull/10917