RFR: 8290154: [JVMCI] partially implement JVMCI for RISC-V [v7]

[Sacha Coppey]

On Wed, 24 Aug 2022 11:33:01 GMT, Fei Yang <fyang at openjdk.org> wrote:

> > > I see you added more changes in hotspot file sharedRuntime_riscv.cpp guarded by macro INCLUDE_JVMCI. Searching for INCLUDE_JVMCI or COMPILER2_OR_JVMCI in src/hotspot/cpu/aarch64, I see several more places checking for these macros. Have you checked if we need similar changes for your use case?
> > 
> > 
> > I first added the changes for all places where those macros are used, but since only modifying sharedRuntime_riscv.cpp was enough to make the tests pass, I did not wanted to add code that I was not sure was useful at the moment.
> 
> Well, that sounds fragile to me since you are depending on a relatively small set of JTreg tests here. I think an analysis is needed here to be sure about whether those are really needed or not.

Those parts of code will ultimately be needed for a full JVMCI implementation, but adding them right now would leave them untested, since for example, neither of the JTreg tests or the RISC-V LLVM backend for Native Image cover the case where synchronized code is installed (this corresponds to the code in `templateInterpreterGenerator_riscv.cpp`).

However, if it is still better to include those parts of code, I don't mind adding the implementation I have for them.

-------------

PR: https://git.openjdk.org/jdk/pull/9587