[riscv-port-jdk11u:riscv-port] RFR: 8294366: RISC-V: Partially mark out incompressible regions [v2]

[Dingli Zhang]

On Thu, 17 Oct 2024 02:38:59 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

>> Hi,
>> Please help review this backport to riscv-port-jdk11u.
>> 
>> Backport of [JDK-8294366](https://bugs.openjdk.org/browse/JDK-8294366).
>> 
>> The original patch cannot be directly applied because of riscv-port-jdk11u do not have `BarrierSetAssembler::nmethod_entry_barrier`, [JDK-8223173](https://bugs.openjdk.org/browse/JDK-8223173) or [JDK-8223173](https://bugs.openjdk.org/browse/JDK-8293007).
>> 
>> Testing:
>> - Tier1 passed without new failure on lp4a (release).
>
> Dingli Zhang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix build_frame

https://github.com/openjdk/riscv-port-jdk11u/commit/309291f166821443393818beed364de6f2de5c52 

> Unfortunately this is not enough, I'm still getting "assert(false) failed: wrong size of mach node"
> 
> 13894 Epilog === [[]] [-2147459160]
> 
> # pop frame 160
> ```
>    add  sp, sp, #160
>    ld  ra, [sp,#-16]
>    ld  fp, [sp,#-8]
>    # touch polling page
>    li  t0, #0x7f6e12e29000
>    ld  zr, [t0] n_size (272), current_offset (4620), instr_offset (4340)
> ```

We have a couple more RVC patches related to the changes here, so please wait for those to be merged in before trying again, thanks!

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PR Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/43#issuecomment-2423423350