http://www.antlr.org/antlr4-runtime: The ANTLR 4 Runtime (ANTLR) 
public abstract class org.antlr.v4.runtime.atn.BlockStartState extends org.antlr.v4.runtime.atn.DecisionState
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.antlr.v4.runtime.atn.BlockStartState
  super_class: org.antlr.v4.runtime.atn.DecisionState
{
  public org.antlr.v4.runtime.atn.BlockEndState endState;
    descriptor: Lorg/antlr/v4/runtime/atn/BlockEndState;
    flags: (0x0001) ACC_PUBLIC

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.antlr.v4.runtime.atn.BlockStartState this
         0: .line 10
            aload 0 /* this */
            invokespecial org.antlr.v4.runtime.atn.DecisionState.<init>:()V
            return
        end local 0 // org.antlr.v4.runtime.atn.BlockStartState this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/antlr/v4/runtime/atn/BlockStartState;
}
SourceFile: "BlockStartState.java"