CLinker migration from jdk17 to jdk18

[Maurizio Cimadamore]

On 05/04/2022 16:08, Lev Serebryakov wrote:
> On 05.04.2022 17:32, Maurizio Cimadamore wrote:
>
>  BTW, I get "java.lang.invoke.WrongMethodTypeException" when call 
> invokeExact() resulting handle on JDK18/Windows.
>
>  Previous code works well on JDK17.

Please past callsite code. You are probably missing some casts to 
Addressable in by-ref parameters.

The tutorial previously linked (as well as the CLinker API javadoc) 
covers this.

Maurizio


>
>> So, in short, your example will become something like:
>>
>> ```
>> h_native = CLinker.systemCLinker()
>>              .downcallHandle(
>>                  libLookup.lookup("somefunc").get(),
>>                  FunctionDescriptor.of(
>>                      ValueLayout.ADDRESS,
>>                      ValueLayout.JAVA_INT,
>>                      ValueLayout.ADDRESS,
>>                      ValueLayout.ADDRESS,
>>                      ValueLayout.JAVA_INT,
>>                      ValueLayout.JAVA_INT
>>                  )
>>              );
>> ```
>>
>> (the above assumes LP64 - e.g. where a C int is 32 bits).
>