https://www.graalvm.org/ 
class com.oracle.svm.tutorial.CInterfaceTutorial$CInterfaceTutorialDirectives implements org.graalvm.nativeimage.c.CContext$Directives
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.svm.tutorial.CInterfaceTutorial$CInterfaceTutorialDirectives
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.tutorial.CInterfaceTutorial$CInterfaceTutorialDirectives this
         0: .line 70
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.svm.tutorial.CInterfaceTutorial$CInterfaceTutorialDirectives this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/tutorial/CInterfaceTutorial$CInterfaceTutorialDirectives;

  public java.util.List<java.lang.String> getHeaderFiles();
    descriptor: ()Ljava/util/List;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.svm.tutorial.CInterfaceTutorial$CInterfaceTutorialDirectives this
         0: .line 78
            ldc "com.oracle.svm.tutorial"
            ldc "native/mydata.h"
            invokestatic com.oracle.svm.core.c.ProjectHeaderFile.resolve:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            invokestatic java.util.Collections.singletonList:(Ljava/lang/Object;)Ljava/util/List;
            areturn
        end local 0 // com.oracle.svm.tutorial.CInterfaceTutorial$CInterfaceTutorialDirectives this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/tutorial/CInterfaceTutorial$CInterfaceTutorialDirectives;
    Signature: ()Ljava/util/List<Ljava/lang/String;>;
}
SourceFile: "CInterfaceTutorial.java"
NestHost: com.oracle.svm.tutorial.CInterfaceTutorial
InnerClasses:
  CInterfaceTutorialDirectives = com.oracle.svm.tutorial.CInterfaceTutorial$CInterfaceTutorialDirectives of com.oracle.svm.tutorial.CInterfaceTutorial
  public abstract Directives = org.graalvm.nativeimage.c.CContext$Directives of org.graalvm.nativeimage.c.CContext