https://www.graalvm.org/ 
public interface org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotCallback extends org.graalvm.nativeimage.c.function.CFunctionPointer
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotCallback
  super_class: java.lang.Object
{
  public abstract org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotValue invoke(org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotIsolateThread, org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotCallbackInfo);
    descriptor: (Lorg/graalvm/polyglot/nativeapi/types/PolyglotNativeAPITypes$PolyglotIsolateThread;Lorg/graalvm/polyglot/nativeapi/types/PolyglotNativeAPITypes$PolyglotCallbackInfo;)Lorg/graalvm/polyglot/nativeapi/types/PolyglotNativeAPITypes$PolyglotValue;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleAnnotations: 
      org.graalvm.nativeimage.c.function.InvokeCFunctionPointer()
    MethodParameters:
         Name  Flags
      ithread  
      info     
}
SourceFile: "PolyglotNativeAPITypes.java"
NestHost: org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes
InnerClasses:
  public abstract PolyglotCallback = org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotCallback of org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes
  public abstract PolyglotCallbackInfo = org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotCallbackInfo of org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes
  public abstract PolyglotIsolateThread = org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotIsolateThread of org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes
  public abstract PolyglotValue = org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes$PolyglotValue of org.graalvm.polyglot.nativeapi.types.PolyglotNativeAPITypes
    RuntimeVisibleAnnotations: 
      com.oracle.svm.core.c.CTypedef(name = "poly_callback")