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.transform.FieldVisitorTee extends org.objectweb.asm.FieldVisitor
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: net.sf.cglib.transform.FieldVisitorTee
  super_class: org.objectweb.asm.FieldVisitor
{
  private org.objectweb.asm.FieldVisitor fv1;
    descriptor: Lorg/objectweb/asm/FieldVisitor;
    flags: (0x0002) ACC_PRIVATE

  private org.objectweb.asm.FieldVisitor fv2;
    descriptor: Lorg/objectweb/asm/FieldVisitor;
    flags: (0x0002) ACC_PRIVATE

  public void <init>(org.objectweb.asm.FieldVisitor, org.objectweb.asm.FieldVisitor);
    descriptor: (Lorg/objectweb/asm/FieldVisitor;Lorg/objectweb/asm/FieldVisitor;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // net.sf.cglib.transform.FieldVisitorTee this
        start local 1 // org.objectweb.asm.FieldVisitor fv1
        start local 2 // org.objectweb.asm.FieldVisitor fv2
         0: .line 28
            aload 0 /* this */
            getstatic net.sf.cglib.core.Constants.ASM_API:I
            invokespecial org.objectweb.asm.FieldVisitor.<init>:(I)V
         1: .line 29
            aload 0 /* this */
            aload 1 /* fv1 */
            putfield net.sf.cglib.transform.FieldVisitorTee.fv1:Lorg/objectweb/asm/FieldVisitor;
         2: .line 30
            aload 0 /* this */
            aload 2 /* fv2 */
            putfield net.sf.cglib.transform.FieldVisitorTee.fv2:Lorg/objectweb/asm/FieldVisitor;
         3: .line 31
            return
        end local 2 // org.objectweb.asm.FieldVisitor fv2
        end local 1 // org.objectweb.asm.FieldVisitor fv1
        end local 0 // net.sf.cglib.transform.FieldVisitorTee this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lnet/sf/cglib/transform/FieldVisitorTee;
            0    4     1   fv1  Lorg/objectweb/asm/FieldVisitor;
            0    4     2   fv2  Lorg/objectweb/asm/FieldVisitor;
    MethodParameters:
      Name  Flags
      fv1   
      fv2   

  public org.objectweb.asm.AnnotationVisitor visitAnnotation(java.lang.String, boolean);
    descriptor: (Ljava/lang/String;Z)Lorg/objectweb/asm/AnnotationVisitor;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // net.sf.cglib.transform.FieldVisitorTee this
        start local 1 // java.lang.String desc
        start local 2 // boolean visible
         0: .line 34
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv1:Lorg/objectweb/asm/FieldVisitor;
            aload 1 /* desc */
            iload 2 /* visible */
            invokevirtual org.objectweb.asm.FieldVisitor.visitAnnotation:(Ljava/lang/String;Z)Lorg/objectweb/asm/AnnotationVisitor;
         1: .line 35
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv2:Lorg/objectweb/asm/FieldVisitor;
            aload 1 /* desc */
            iload 2 /* visible */
            invokevirtual org.objectweb.asm.FieldVisitor.visitAnnotation:(Ljava/lang/String;Z)Lorg/objectweb/asm/AnnotationVisitor;
         2: .line 34
            invokestatic net.sf.cglib.transform.AnnotationVisitorTee.getInstance:(Lorg/objectweb/asm/AnnotationVisitor;Lorg/objectweb/asm/AnnotationVisitor;)Lorg/objectweb/asm/AnnotationVisitor;
            areturn
        end local 2 // boolean visible
        end local 1 // java.lang.String desc
        end local 0 // net.sf.cglib.transform.FieldVisitorTee this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lnet/sf/cglib/transform/FieldVisitorTee;
            0    3     1     desc  Ljava/lang/String;
            0    3     2  visible  Z
    MethodParameters:
         Name  Flags
      desc     
      visible  

  public void visitAttribute(org.objectweb.asm.Attribute);
    descriptor: (Lorg/objectweb/asm/Attribute;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // net.sf.cglib.transform.FieldVisitorTee this
        start local 1 // org.objectweb.asm.Attribute attr
         0: .line 39
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv1:Lorg/objectweb/asm/FieldVisitor;
            aload 1 /* attr */
            invokevirtual org.objectweb.asm.FieldVisitor.visitAttribute:(Lorg/objectweb/asm/Attribute;)V
         1: .line 40
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv2:Lorg/objectweb/asm/FieldVisitor;
            aload 1 /* attr */
            invokevirtual org.objectweb.asm.FieldVisitor.visitAttribute:(Lorg/objectweb/asm/Attribute;)V
         2: .line 41
            return
        end local 1 // org.objectweb.asm.Attribute attr
        end local 0 // net.sf.cglib.transform.FieldVisitorTee this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lnet/sf/cglib/transform/FieldVisitorTee;
            0    3     1  attr  Lorg/objectweb/asm/Attribute;
    MethodParameters:
      Name  Flags
      attr  

  public void visitEnd();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // net.sf.cglib.transform.FieldVisitorTee this
         0: .line 44
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv1:Lorg/objectweb/asm/FieldVisitor;
            invokevirtual org.objectweb.asm.FieldVisitor.visitEnd:()V
         1: .line 45
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv2:Lorg/objectweb/asm/FieldVisitor;
            invokevirtual org.objectweb.asm.FieldVisitor.visitEnd:()V
         2: .line 46
            return
        end local 0 // net.sf.cglib.transform.FieldVisitorTee this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lnet/sf/cglib/transform/FieldVisitorTee;

  public org.objectweb.asm.AnnotationVisitor visitTypeAnnotation(int, org.objectweb.asm.TypePath, java.lang.String, boolean);
    descriptor: (ILorg/objectweb/asm/TypePath;Ljava/lang/String;Z)Lorg/objectweb/asm/AnnotationVisitor;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=5, args_size=5
        start local 0 // net.sf.cglib.transform.FieldVisitorTee this
        start local 1 // int typeRef
        start local 2 // org.objectweb.asm.TypePath typePath
        start local 3 // java.lang.String desc
        start local 4 // boolean visible
         0: .line 49
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv1:Lorg/objectweb/asm/FieldVisitor;
            iload 1 /* typeRef */
            aload 2 /* typePath */
            aload 3 /* desc */
            iload 4 /* visible */
            invokevirtual org.objectweb.asm.FieldVisitor.visitTypeAnnotation:(ILorg/objectweb/asm/TypePath;Ljava/lang/String;Z)Lorg/objectweb/asm/AnnotationVisitor;
         1: .line 50
            aload 0 /* this */
            getfield net.sf.cglib.transform.FieldVisitorTee.fv2:Lorg/objectweb/asm/FieldVisitor;
            iload 1 /* typeRef */
            aload 2 /* typePath */
            aload 3 /* desc */
            iload 4 /* visible */
            invokevirtual org.objectweb.asm.FieldVisitor.visitTypeAnnotation:(ILorg/objectweb/asm/TypePath;Ljava/lang/String;Z)Lorg/objectweb/asm/AnnotationVisitor;
         2: .line 49
            invokestatic net.sf.cglib.transform.AnnotationVisitorTee.getInstance:(Lorg/objectweb/asm/AnnotationVisitor;Lorg/objectweb/asm/AnnotationVisitor;)Lorg/objectweb/asm/AnnotationVisitor;
            areturn
        end local 4 // boolean visible
        end local 3 // java.lang.String desc
        end local 2 // org.objectweb.asm.TypePath typePath
        end local 1 // int typeRef
        end local 0 // net.sf.cglib.transform.FieldVisitorTee this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0      this  Lnet/sf/cglib/transform/FieldVisitorTee;
            0    3     1   typeRef  I
            0    3     2  typePath  Lorg/objectweb/asm/TypePath;
            0    3     3      desc  Ljava/lang/String;
            0    3     4   visible  Z
    MethodParameters:
          Name  Flags
      typeRef   
      typePath  
      desc      
      visible   
}
SourceFile: "FieldVisitorTee.java"