https://www.graalvm.org/ 
public interface com.oracle.svm.hosted.c.DirectivesExtension extends org.graalvm.nativeimage.c.CContext$Directives
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.svm.hosted.c.DirectivesExtension
  super_class: java.lang.Object
{
  public java.util.List<java.lang.String> getHeaderSnippet();
    descriptor: ()Ljava/util/List;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.svm.hosted.c.DirectivesExtension this
         0: .line 41
            invokestatic java.util.Collections.emptyList:()Ljava/util/List;
            areturn
        end local 0 // com.oracle.svm.hosted.c.DirectivesExtension this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/svm/hosted/c/DirectivesExtension;
    Signature: ()Ljava/util/List<Ljava/lang/String;>;
}
SourceFile: "DirectivesExtension.java"
InnerClasses:
  public abstract Directives = org.graalvm.nativeimage.c.CContext$Directives of org.graalvm.nativeimage.c.CContext