https://github.com/cglib/cglib/cglib: cglib is a powerful, high performance and quality Code Generation Library, It is used to extend JAVA classes and implements interfaces at runtime. 
public class net.sf.cglib.proxy.Mixin$Generator extends net.sf.cglib.core.AbstractClassGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: net.sf.cglib.proxy.Mixin$Generator
  super_class: net.sf.cglib.core.AbstractClassGenerator
{
  private static final net.sf.cglib.core.AbstractClassGenerator$Source SOURCE;
    descriptor: Lnet/sf/cglib/core/AbstractClassGenerator$Source;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private java.lang.Class[] classes;
    descriptor: [Ljava/lang/Class;
    flags: (0x0002) ACC_PRIVATE

  private java.lang.Object[] delegates;
    descriptor: [Ljava/lang/Object;
    flags: (0x0002) ACC_PRIVATE

  private int style;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  private int[] route;
    descriptor: [I
    flags: (0x0002) ACC_PRIVATE

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 96
            new net.sf.cglib.core.AbstractClassGenerator$Source
            dup
            ldc Lnet/sf/cglib/proxy/Mixin;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokespecial net.sf.cglib.core.AbstractClassGenerator$Source.<init>:(Ljava/lang/String;)V
            putstatic net.sf.cglib.proxy.Mixin$Generator.SOURCE:Lnet/sf/cglib/core/AbstractClassGenerator$Source;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
         0: .line 105
            aload 0 /* this */
            getstatic net.sf.cglib.proxy.Mixin$Generator.SOURCE:Lnet/sf/cglib/core/AbstractClassGenerator$Source;
            invokespecial net.sf.cglib.core.AbstractClassGenerator.<init>:(Lnet/sf/cglib/core/AbstractClassGenerator$Source;)V
         1: .line 100
            aload 0 /* this */
            iconst_0
            putfield net.sf.cglib.proxy.Mixin$Generator.style:I
         2: .line 106
            return
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lnet/sf/cglib/proxy/Mixin$Generator;

  protected java.lang.ClassLoader getDefaultClassLoader();
    descriptor: ()Ljava/lang/ClassLoader;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
         0: .line 109
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            iconst_0
            aaload
            invokevirtual java.lang.Class.getClassLoader:()Ljava/lang/ClassLoader;
            areturn
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lnet/sf/cglib/proxy/Mixin$Generator;

  protected java.security.ProtectionDomain getProtectionDomain();
    descriptor: ()Ljava/security/ProtectionDomain;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
         0: .line 113
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            iconst_0
            aaload
            invokestatic net.sf.cglib.core.ReflectUtils.getProtectionDomain:(Ljava/lang/Class;)Ljava/security/ProtectionDomain;
            areturn
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lnet/sf/cglib/proxy/Mixin$Generator;

  public void setStyle(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
        start local 1 // int style
         0: .line 117
            iload 1 /* style */
            tableswitch { // 0 - 2
                    0: 1
                    1: 1
                    2: 1
              default: 3
          }
         1: .line 121
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            iload 1 /* style */
            putfield net.sf.cglib.proxy.Mixin$Generator.style:I
         2: .line 122
            goto 4
         3: .line 124
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Unknown mixin style: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 1 /* style */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 126
      StackMap locals:
      StackMap stack:
            return
        end local 1 // int style
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    5     0   this  Lnet/sf/cglib/proxy/Mixin$Generator;
            0    5     1  style  I
    MethodParameters:
       Name  Flags
      style  

  public void setClasses(java.lang.Class[]);
    descriptor: ([Ljava/lang/Class;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
        start local 1 // java.lang.Class[] classes
         0: .line 129
            aload 0 /* this */
            aload 1 /* classes */
            putfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
         1: .line 130
            return
        end local 1 // java.lang.Class[] classes
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lnet/sf/cglib/proxy/Mixin$Generator;
            0    2     1  classes  [Ljava/lang/Class;
    MethodParameters:
         Name  Flags
      classes  

  public void setDelegates(java.lang.Object[]);
    descriptor: ([Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
        start local 1 // java.lang.Object[] delegates
         0: .line 133
            aload 0 /* this */
            aload 1 /* delegates */
            putfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
         1: .line 134
            return
        end local 1 // java.lang.Object[] delegates
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lnet/sf/cglib/proxy/Mixin$Generator;
            0    2     1  delegates  [Ljava/lang/Object;
    MethodParameters:
           Name  Flags
      delegates  

  public net.sf.cglib.proxy.Mixin create();
    descriptor: ()Lnet/sf/cglib/proxy/Mixin;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=1
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
         0: .line 137
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            ifnonnull 2
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
            ifnonnull 2
         1: .line 138
            new java.lang.IllegalStateException
            dup
            ldc "Either classes or delegates must be set"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 140
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.style:I
            tableswitch { // 0 - 2
                    0: 3
                    1: 8
                    2: 8
              default: 21
          }
         3: .line 142
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            ifnonnull 21
         4: .line 143
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
            invokestatic net.sf.cglib.proxy.Mixin.route:([Ljava/lang/Object;)Lnet/sf/cglib/proxy/Mixin$Route;
            astore 1 /* r */
        start local 1 // net.sf.cglib.proxy.Mixin$Route r
         5: .line 144
            aload 0 /* this */
            aload 1 /* r */
            getfield net.sf.cglib.proxy.Mixin$Route.classes:[Ljava/lang/Class;
            putfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
         6: .line 145
            aload 0 /* this */
            aload 1 /* r */
            getfield net.sf.cglib.proxy.Mixin$Route.route:[I
            putfield net.sf.cglib.proxy.Mixin$Generator.route:[I
        end local 1 // net.sf.cglib.proxy.Mixin$Route r
         7: .line 147
            goto 21
         8: .line 151
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            ifnonnull 11
         9: .line 152
            aload 0 /* this */
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
            invokestatic net.sf.cglib.core.ReflectUtils.getClasses:([Ljava/lang/Object;)[Ljava/lang/Class;
            putfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
        10: .line 153
            goto 21
        11: .line 154
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
            ifnull 21
        12: .line 155
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
            invokestatic net.sf.cglib.core.ReflectUtils.getClasses:([Ljava/lang/Object;)[Ljava/lang/Class;
            astore 1 /* temp */
        start local 1 // java.lang.Class[] temp
        13: .line 156
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            arraylength
            aload 1 /* temp */
            arraylength
            if_icmpeq 15
        14: .line 157
            new java.lang.IllegalStateException
            dup
            ldc "Specified classes are incompatible with delegates"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
        15: .line 159
      StackMap locals: java.lang.Class[]
      StackMap stack:
            iconst_0
            istore 2 /* i */
        start local 2 // int i
        16: goto 20
        17: .line 160
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            iload 2 /* i */
            aaload
            aload 1 /* temp */
            iload 2 /* i */
            aaload
            invokevirtual java.lang.Class.isAssignableFrom:(Ljava/lang/Class;)Z
            ifne 19
        18: .line 161
            new java.lang.IllegalStateException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Specified class "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            iload 2 /* i */
            aaload
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc " is incompatible with delegate class "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 1 /* temp */
            iload 2 /* i */
            aaload
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc " (index "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            iload 2 /* i */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc ")"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
        19: .line 159
      StackMap locals:
      StackMap stack:
            iinc 2 /* i */ 1
      StackMap locals:
      StackMap stack:
        20: iload 2 /* i */
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            arraylength
            if_icmplt 17
        end local 2 // int i
        end local 1 // java.lang.Class[] temp
        21: .line 167
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            invokestatic net.sf.cglib.core.ReflectUtils.findPackageProtected:([Ljava/lang/Class;)I
            aaload
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual net.sf.cglib.proxy.Mixin$Generator.setNamePrefix:(Ljava/lang/String;)V
        22: .line 169
            aload 0 /* this */
            getstatic net.sf.cglib.proxy.Mixin.KEY_FACTORY:Lnet/sf/cglib/proxy/Mixin$MixinKey;
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.style:I
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            invokestatic net.sf.cglib.core.ReflectUtils.getNames:([Ljava/lang/Class;)[Ljava/lang/String;
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.route:[I
            invokeinterface net.sf.cglib.proxy.Mixin$MixinKey.newInstance:(I[Ljava/lang/String;[I)Ljava/lang/Object;
            invokespecial net.sf.cglib.core.AbstractClassGenerator.create:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast net.sf.cglib.proxy.Mixin
            areturn
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   23     0  this  Lnet/sf/cglib/proxy/Mixin$Generator;
            5    7     1     r  Lnet/sf/cglib/proxy/Mixin$Route;
           13   21     1  temp  [Ljava/lang/Class;
           16   21     2     i  I

  public void generateClass(org.objectweb.asm.ClassVisitor);
    descriptor: (Lorg/objectweb/asm/ClassVisitor;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
        start local 1 // org.objectweb.asm.ClassVisitor v
         0: .line 173
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.style:I
            tableswitch { // 0 - 2
                    0: 1
                    1: 3
                    2: 5
              default: 6
          }
         1: .line 175
      StackMap locals:
      StackMap stack:
            new net.sf.cglib.proxy.MixinEmitter
            aload 1 /* v */
            aload 0 /* this */
            invokevirtual net.sf.cglib.proxy.Mixin$Generator.getClassName:()Ljava/lang/String;
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.route:[I
            invokespecial net.sf.cglib.proxy.MixinEmitter.<init>:(Lorg/objectweb/asm/ClassVisitor;Ljava/lang/String;[Ljava/lang/Class;[I)V
         2: .line 176
            goto 6
         3: .line 178
      StackMap locals:
      StackMap stack:
            new net.sf.cglib.proxy.MixinBeanEmitter
            aload 1 /* v */
            aload 0 /* this */
            invokevirtual net.sf.cglib.proxy.Mixin$Generator.getClassName:()Ljava/lang/String;
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            invokespecial net.sf.cglib.proxy.MixinBeanEmitter.<init>:(Lorg/objectweb/asm/ClassVisitor;Ljava/lang/String;[Ljava/lang/Class;)V
         4: .line 179
            goto 6
         5: .line 181
      StackMap locals:
      StackMap stack:
            new net.sf.cglib.proxy.MixinEverythingEmitter
            aload 1 /* v */
            aload 0 /* this */
            invokevirtual net.sf.cglib.proxy.Mixin$Generator.getClassName:()Ljava/lang/String;
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.classes:[Ljava/lang/Class;
            invokespecial net.sf.cglib.proxy.MixinEverythingEmitter.<init>:(Lorg/objectweb/asm/ClassVisitor;Ljava/lang/String;[Ljava/lang/Class;)V
         6: .line 184
      StackMap locals:
      StackMap stack:
            return
        end local 1 // org.objectweb.asm.ClassVisitor v
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lnet/sf/cglib/proxy/Mixin$Generator;
            0    7     1     v  Lorg/objectweb/asm/ClassVisitor;
    MethodParameters:
      Name  Flags
      v     

  protected java.lang.Object firstInstance(java.lang.Class);
    descriptor: (Ljava/lang/Class;)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
        start local 1 // java.lang.Class type
         0: .line 187
            aload 1 /* type */
            invokestatic net.sf.cglib.core.ReflectUtils.newInstance:(Ljava/lang/Class;)Ljava/lang/Object;
            checkcast net.sf.cglib.proxy.Mixin
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
            invokevirtual net.sf.cglib.proxy.Mixin.newInstance:([Ljava/lang/Object;)Lnet/sf/cglib/proxy/Mixin;
            areturn
        end local 1 // java.lang.Class type
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lnet/sf/cglib/proxy/Mixin$Generator;
            0    1     1  type  Ljava/lang/Class;
    MethodParameters:
      Name  Flags
      type  

  protected java.lang.Object nextInstance(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.proxy.Mixin$Generator this
        start local 1 // java.lang.Object instance
         0: .line 191
            aload 1 /* instance */
            checkcast net.sf.cglib.proxy.Mixin
            aload 0 /* this */
            getfield net.sf.cglib.proxy.Mixin$Generator.delegates:[Ljava/lang/Object;
            invokevirtual net.sf.cglib.proxy.Mixin.newInstance:([Ljava/lang/Object;)Lnet/sf/cglib/proxy/Mixin;
            areturn
        end local 1 // java.lang.Object instance
        end local 0 // net.sf.cglib.proxy.Mixin$Generator this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    1     0      this  Lnet/sf/cglib/proxy/Mixin$Generator;
            0    1     1  instance  Ljava/lang/Object;
    MethodParameters:
          Name  Flags
      instance  
}
SourceFile: "Mixin.java"
NestHost: net.sf.cglib.proxy.Mixin
InnerClasses:
  protected Source = net.sf.cglib.core.AbstractClassGenerator$Source of net.sf.cglib.core.AbstractClassGenerator
  public Generator = net.sf.cglib.proxy.Mixin$Generator of net.sf.cglib.proxy.Mixin
  abstract MixinKey = net.sf.cglib.proxy.Mixin$MixinKey of net.sf.cglib.proxy.Mixin
  private Route = net.sf.cglib.proxy.Mixin$Route of net.sf.cglib.proxy.Mixin