Integrated: 8287071: Loom: Cleanup x86_64 gen_continuation_enter

[Aleksey Shipilev]

On Fri, 20 May 2022 07:49:21 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> During x86_32 porting, I ended up rewriting the copy of x86_64 gen_continuation_enter significantly to make it more streamlined. The original x86_64 gen_continuation_enter should enjoy the similar streamlining, since it would likely to be the template for many other architectures.
> 
> There might be more things to do, I would not know until x86_32 fully works. I am pretty sure current thing is self-sufficient.
> 
> Brief tour of changes:
>  - Check the incoming registers explicitly
>  - Pass explicit argument registers to `fill_continuation_entry`
>  - Use the usual `NativeCall` alignment code to produce a patchable call
>  - Check that static stub is emitted, fail hard otherwise
>  - Handle register shuffling for `exception_handler_for_return_address` the similar way we do it in `StubGenerator`
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug, prospective `jdk_loom hotspot_loom`

This pull request has now been integrated.

Changeset: 956d44d2
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/956d44d2da54926a37acfb415d87f071663b4b40
Stats:     114 lines in 2 files changed: 51 ins; 18 del; 45 mod

8287071: Loom: Cleanup x86_64 gen_continuation_enter

Reviewed-by: rpressler, pchilanomate, kvn

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PR: https://git.openjdk.java.net/jdk/pull/8802