Integrated: 8303409: Add Windows AArch64 ABI support to the Foreign Function & Memory API

[Saint Wesonga]

On Mon, 27 Feb 2023 17:04:28 GMT, Saint Wesonga <duke at openjdk.org> wrote:

> There are 2 primary differences between the Windows ARM64 ABI and the macOS/Linux ARM64 ABI: variadic floating point arguments are passed in general purpose registers on Windows (instead of the vector registers). In addition to this, up to 64 bytes of a struct being passed to a variadic function can be placed in general purpose registers. This happens regardless of the type of struct (HFA or other generic struct). This means that a struct can be split across registers and the stack when invoking a variadic function. The Windows ARM64 ABI conventions are documented at https://learn.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions
> 
> For details about the Foreign Function & Memory API, see JEP 434 at https://openjdk.org/jeps/434
> 
> This change is a cherry pick of https://github.com/openjdk/panama-foreign/commit/d379ca1c and https://github.com/openjdk/panama-foreign/commit/08225e4f from https://github.com/openjdk/panama-foreign/pull/754 and includes an additional commit that introduces a VaList implementation for Windows on AArch64.

This pull request has now been integrated.

Changeset: fb130639
Author:    Saint Wesonga <sawesong at microsoft.com>
Committer: Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/fb1306394368bdfe3ccfe4980c663d0a56b4a643
Stats:     2135 lines in 20 files changed: 1445 ins; 650 del; 40 mod

8303409: Add Windows AArch64 ABI support to the Foreign Function & Memory API

Reviewed-by: jvernee

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

PR: https://git.openjdk.org/jdk/pull/12773