RFR: 8297822: De-duplicate code in module jdk.sctp

[Daniel Fuchs]

On Wed, 30 Nov 2022 16:54:02 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes merging logic and optimising three classes that exist for aix, maces and windows.
> 
> Optimisation will reduce byte code. Below is an example for one of the many methods optimised.
> 
> Before:
> 
> public void implCloseSelectableChannel() throws java.io.IOException;
>   Code:
>      0: new           #7                  // class java/lang/UnsupportedOperationException
>      3: dup
>      4: ldc           #11                 // String SCTP not supported on this platform
>      6: invokespecial #13                 // Method java/lang/UnsupportedOperationException."<init>":(Ljava/lang/String;)V
>      9: athrow
> 
> 
> After:
> 
> public void implCloseSelectableChannel() throws java.io.IOException;
>   Code:
>      0: invokestatic  #16                 // Method sun/nio/ch/sctp/UnsupportedUtil.sctpUnsupported:()Ljava/lang/UnsupportedOperationException;
>      3: athrow

Good to see all the duplication go away.

src/jdk.sctp/share/classes/sun/nio/ch/sctp/UnsupportedUtil.java line 1:

> 1: package sun.nio.ch.sctp;

Still need regular copyright header :-)

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PR: https://git.openjdk.org/jdk/pull/11436