https://github.com/oracle/graal: GraalVM is an ecosystem for compiling and running applications written in multiple languages. GraalVM removes the isolation between programming languages and enables interoperability in a shared runtime. 
public abstract class org.graalvm.polyglot.impl.AbstractPolyglotImpl$AbstractStackFrameImpl
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.graalvm.polyglot.impl.AbstractPolyglotImpl$AbstractStackFrameImpl
  super_class: java.lang.Object
{
  protected void <init>(org.graalvm.polyglot.impl.AbstractPolyglotImpl);
    descriptor: (Lorg/graalvm/polyglot/impl/AbstractPolyglotImpl;)V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // org.graalvm.polyglot.impl.AbstractPolyglotImpl$AbstractStackFrameImpl this
        start local 1 // org.graalvm.polyglot.impl.AbstractPolyglotImpl engineImpl
         0: .line 509
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 510
            aload 1 /* engineImpl */
            invokestatic java.util.Objects.requireNonNull:(Ljava/lang/Object;)Ljava/lang/Object;
            pop
         2: .line 511
            return
        end local 1 // org.graalvm.polyglot.impl.AbstractPolyglotImpl engineImpl
        end local 0 // org.graalvm.polyglot.impl.AbstractPolyglotImpl$AbstractStackFrameImpl this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    3     0        this  Lorg/graalvm/polyglot/impl/AbstractPolyglotImpl$AbstractStackFrameImpl;
            0    3     1  engineImpl  Lorg/graalvm/polyglot/impl/AbstractPolyglotImpl;
    MethodParameters:
            Name  Flags
      engineImpl  

  public abstract java.lang.StackTraceElement toHostFrame();
    descriptor: ()Ljava/lang/StackTraceElement;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract org.graalvm.polyglot.SourceSection getSourceLocation();
    descriptor: ()Lorg/graalvm/polyglot/SourceSection;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract java.lang.String getRootName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract org.graalvm.polyglot.Language getLanguage();
    descriptor: ()Lorg/graalvm/polyglot/Language;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract boolean isHostFrame();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract java.lang.String toStringImpl(int);
    descriptor: (I)Ljava/lang/String;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
                Name  Flags
      languageColumn  
}
SourceFile: "AbstractPolyglotImpl.java"
NestHost: org.graalvm.polyglot.impl.AbstractPolyglotImpl
InnerClasses:
  public abstract AbstractStackFrameImpl = org.graalvm.polyglot.impl.AbstractPolyglotImpl$AbstractStackFrameImpl of org.graalvm.polyglot.impl.AbstractPolyglotImpl