[foreign-memaccess+abi] RFR: 8289285: Use records for binding classes

[Jorn Vernee]

On Tue, 28 Jun 2022 10:42:39 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> This PR switches the Binding classes to use records. This results in a clean simplification of the code due to the no longer having the need to implement equals/hashcode/toString as well. When we have type patterns for switch, we will also be able to remove the tag, and just switch on the type.
> 
> I also noticed that the UnboxAddress binding had 2 fields that were not being used. In practice this binding always operates on Addressable instances (both in the interpreter and specializer). So, I've cleaned up these 2 fields as well, and related factory method.

src/java.base/share/classes/jdk/internal/foreign/abi/SharedUtils.java line 374:

> 372: 
> 373:     static void checkType(Class<?> actualType, Class<?> expectedType) {
> 374:         if (!expectedType.isAssignableFrom(actualType)) {

This change is needed to accommodate for the fact that UnboxAddress now accepts an Addressable, but a previous binding still outputs either a MemoryAddress or MemorySegment.

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PR: https://git.openjdk.org/panama-foreign/pull/690