[foreign-memaccess+abi] Integrated: 8274912: Eagerly generate native invokers

[Jorn Vernee]

On Thu, 7 Oct 2021 14:29:47 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Hi,
> 
> This patch is a refactoring of VM code pertaining to downcalls. As outlined in the JBS issue, this patch makes 'native invoker' generation currently done by C2 eager.
> 
> Most of the changes in this patch are moving around existing code:
> - The native invoker generation code is moved from sharedRuntime*.cpp to universalNativeInvoker*.cpp, to match what is done for upcalls.
> - C2 & nmethod scaffolding for registering native invokers has been removed (lifetime is now managed in Java code).
> - Now, C2 will only intrinsify trivial downcalls, which means some of the code was simplified there.
> - To reduce code duplication, several utilities have been added:
>   - ArgumentShuffle (and impls of CallConvClosure): a utility class for computing argument shuffles and generating shuffling code. The shuffling code is heavily based on what is done today for optimized upcalls on x64.
>   - To support the above, I've made a copy of the ComputeMoveOrder utility from SharedRuntime code (which was only implemented on x64), and adapted it to our use case.
>   - RegSpillFill: similarly, a utility for computing and generating register spill and fill code (given a list of registers).
>   - oop_cast: this was a pre-existing utility that was renamed (from 'cast') and moved into a separate file.
> - The linkToNative method handle stub now just loads the invoker address from the appendix argument and jumps to it, instead of jumping to the fallback method handle.
> 
> The implementation passes all the jdk_foreign tests on Windows/x64, Linux/x64 (WSL), and Linux/AArch64. Though, there were some pre-exsiting test failures on AArch64 wrt variadic functions.
> 
> Thanks,
> Jorn

This pull request has now been integrated.

Changeset: 1aa1c29c
Author:    Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.java.net/panama-foreign/commit/1aa1c29c16cba9f4389c32fd55b5e4653e6a5fff
Stats:     3123 lines in 70 files changed: 1739 ins; 1247 del; 137 mod

8274912: Eagerly generate native invokers

Reviewed-by: ngasson, mcimadamore

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

PR: https://git.openjdk.java.net/panama-foreign/pull/593