Javadoc for Package java.lang.foreign

[Andrew Haley]

On 6/2/22 18:55, Maurizio Cimadamore wrote:
> Good catch, seems like something was lost in there. You need:
> 
> linker.defaultLookup().lookup("strlen").get()

That's not all: setUtf8String wants an offset.

This version runs:

     long doit() throws Throwable {
         var linker = Linker.nativeLinker();
         MethodHandle strlen = linker.downcallHandle(
              linker.defaultLookup().lookup("strlen").get(),
              FunctionDescriptor.of(ValueLayout.JAVA_LONG, ValueLayout.ADDRESS));

         try (var session = MemorySession.openConfined()) {
             var cString = MemorySegment.allocateNative(5 + 1, session);
             cString.setUtf8String(0, "Hello");
             long len = (long)strlen.invoke(cString); // 5
             return len;
         }
     }


-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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