https://www.graalvm.org/ 
public abstract class org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp$SignExtend extends org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp<org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp$SignExtend>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp$SignExtend
  super_class: org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp
{
  protected void <init>();
    descriptor: ()V
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp$SignExtend this
         0: .line 831
            aload 0 /* this */
            ldc "SignExtend"
            invokespecial org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp.<init>:(Ljava/lang/String;)V
         1: .line 832
            return
        end local 0 // org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp$SignExtend this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/graalvm/compiler/core/common/type/ArithmeticOpTable$IntegerConvertOp$SignExtend;
}
Signature: Lorg/graalvm/compiler/core/common/type/ArithmeticOpTable$IntegerConvertOp<Lorg/graalvm/compiler/core/common/type/ArithmeticOpTable$IntegerConvertOp$SignExtend;>;
SourceFile: "ArithmeticOpTable.java"
NestHost: org.graalvm.compiler.core.common.type.ArithmeticOpTable
InnerClasses:
  public abstract IntegerConvertOp = org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp of org.graalvm.compiler.core.common.type.ArithmeticOpTable
  public abstract SignExtend = org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp$SignExtend of org.graalvm.compiler.core.common.type.ArithmeticOpTable$IntegerConvertOp