[Integrated] [foreign-abi] RFR: 8245988: Add a special VaList carrier

[Jorn Vernee]

On Wed, 27 May 2020 16:02:41 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Hi,
> 
> This patch adds a special VaList carrier to CSupport that can be used by C linker implementations to pass `va_list`
> arguments to upcalls and downcalls.
> Currently Windows VaList and SysV VaLists are implemented, but AArach64 not yet.
> 
> The API for the Reader and Builder might be a bit strange; the limitation to int, long, and double comes from the
> standard argument promotions that are done in C when calling a variadic function. Since we do not know how to promote
> any arbitrary value, at least for now the API restricts itself to accepting only types that would not be promoted in C,
> leaving any needed conversion up to the user.  For reviewers; I moved CallArranger.TypeClass + classification code to
> the top level, since it is now shared with the VaList implementations, so that's where the CallArranger diff comes
> from.  Thanks, Jorn

This pull request has now been integrated.

Changeset: a36e19c6
Author:    Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.java.net/panama-foreign/commit/a36e19c6
Stats:     2287 lines in 15 files changed: 270 ins; 2002 del; 15 mod

8245988: Add a special VaList carrier

Reviewed-by: mcimadamore

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PR: https://git.openjdk.java.net/panama-foreign/pull/184