https://www.graalvm.org/ 
public abstract class com.oracle.truffle.api.impl.Accessor$FrameSupport extends com.oracle.truffle.api.impl.Accessor$Support
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.impl.Accessor$FrameSupport
  super_class: com.oracle.truffle.api.impl.Accessor$Support
{
  static final java.lang.String IMPL_CLASS_NAME;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "com.oracle.truffle.api.frame.FrameAccessor$FramesImpl"

  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.impl.Accessor$FrameSupport this
         0: .line 782
            aload 0 /* this */
            ldc "com.oracle.truffle.api.frame.FrameAccessor$FramesImpl"
            invokespecial com.oracle.truffle.api.impl.Accessor$Support.<init>:(Ljava/lang/String;)V
         1: .line 783
            return
        end local 0 // com.oracle.truffle.api.impl.Accessor$FrameSupport this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/api/impl/Accessor$FrameSupport;

  public abstract void markMaterializeCalled(com.oracle.truffle.api.frame.FrameDescriptor);
    descriptor: (Lcom/oracle/truffle/api/frame/FrameDescriptor;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
            Name  Flags
      descriptor  

  public abstract boolean getMaterializeCalled(com.oracle.truffle.api.frame.FrameDescriptor);
    descriptor: (Lcom/oracle/truffle/api/frame/FrameDescriptor;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
            Name  Flags
      descriptor  
}
SourceFile: "Accessor.java"
NestHost: com.oracle.truffle.api.impl.Accessor
InnerClasses:
  public abstract FrameSupport = com.oracle.truffle.api.impl.Accessor$FrameSupport of com.oracle.truffle.api.impl.Accessor
  abstract Support = com.oracle.truffle.api.impl.Accessor$Support of com.oracle.truffle.api.impl.Accessor