http://www.javassist.org/: Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java. (Shigeru Chiba, www.javassist.org) 
class javassist.bytecode.MethodTypeInfo extends javassist.bytecode.ConstInfo
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: javassist.bytecode.MethodTypeInfo
  super_class: javassist.bytecode.ConstInfo
{
  static final int tag;
    descriptor: I
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: 16

  int descriptor;
    descriptor: I
    flags: (0x0000) 

  public void <init>(int, int);
    descriptor: (II)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // int desc
        start local 2 // int index
         0: .line 2249
            aload 0 /* this */
            iload 2 /* index */
            invokespecial javassist.bytecode.ConstInfo.<init>:(I)V
         1: .line 2250
            aload 0 /* this */
            iload 1 /* desc */
            putfield javassist.bytecode.MethodTypeInfo.descriptor:I
         2: .line 2251
            return
        end local 2 // int index
        end local 1 // int desc
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Ljavassist/bytecode/MethodTypeInfo;
            0    3     1   desc  I
            0    3     2  index  I
    MethodParameters:
       Name  Flags
      desc   
      index  

  public void <init>(java.io.DataInputStream, int);
    descriptor: (Ljava/io/DataInputStream;I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // java.io.DataInputStream in
        start local 2 // int index
         0: .line 2256
            aload 0 /* this */
            iload 2 /* index */
            invokespecial javassist.bytecode.ConstInfo.<init>:(I)V
         1: .line 2257
            aload 0 /* this */
            aload 1 /* in */
            invokevirtual java.io.DataInputStream.readUnsignedShort:()I
            putfield javassist.bytecode.MethodTypeInfo.descriptor:I
         2: .line 2258
            return
        end local 2 // int index
        end local 1 // java.io.DataInputStream in
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Ljavassist/bytecode/MethodTypeInfo;
            0    3     1     in  Ljava/io/DataInputStream;
            0    3     2  index  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      in     
      index  

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javassist.bytecode.MethodTypeInfo this
         0: .line 2261
            aload 0 /* this */
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            ireturn
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ljavassist/bytecode/MethodTypeInfo;

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // java.lang.Object obj
         0: .line 2266
            aload 1 /* obj */
            instanceof javassist.bytecode.MethodTypeInfo
            ifeq 3
         1: .line 2267
            aload 1 /* obj */
            checkcast javassist.bytecode.MethodTypeInfo
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            aload 0 /* this */
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            if_icmpne 2
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         2: iconst_0
            ireturn
         3: .line 2268
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 1 // java.lang.Object obj
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Ljavassist/bytecode/MethodTypeInfo;
            0    4     1   obj  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      obj   

  public int getTag();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // javassist.bytecode.MethodTypeInfo this
         0: .line 2272
            bipush 16
            ireturn
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ljavassist/bytecode/MethodTypeInfo;

  public void renameClass(javassist.bytecode.ConstPool, java.lang.String, java.lang.String, java.util.Map<javassist.bytecode.ConstInfo, javassist.bytecode.ConstInfo>);
    descriptor: (Ljavassist/bytecode/ConstPool;Ljava/lang/String;Ljava/lang/String;Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=7, args_size=5
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // javassist.bytecode.ConstPool cp
        start local 2 // java.lang.String oldName
        start local 3 // java.lang.String newName
        start local 4 // java.util.Map cache
         0: .line 2278
            aload 1 /* cp */
            aload 0 /* this */
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            invokevirtual javassist.bytecode.ConstPool.getUtf8Info:(I)Ljava/lang/String;
            astore 5 /* desc */
        start local 5 // java.lang.String desc
         1: .line 2279
            aload 5 /* desc */
            aload 2 /* oldName */
            aload 3 /* newName */
            invokestatic javassist.bytecode.Descriptor.rename:(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            astore 6 /* desc2 */
        start local 6 // java.lang.String desc2
         2: .line 2280
            aload 5 /* desc */
            aload 6 /* desc2 */
            if_acmpeq 8
         3: .line 2281
            aload 4 /* cache */
            ifnonnull 5
         4: .line 2282
            aload 0 /* this */
            aload 1 /* cp */
            aload 6 /* desc2 */
            invokevirtual javassist.bytecode.ConstPool.addUtf8Info:(Ljava/lang/String;)I
            putfield javassist.bytecode.MethodTypeInfo.descriptor:I
            goto 8
         5: .line 2284
      StackMap locals: java.lang.String java.lang.String
      StackMap stack:
            aload 4 /* cache */
            aload 0 /* this */
            invokeinterface java.util.Map.remove:(Ljava/lang/Object;)Ljava/lang/Object;
            pop
         6: .line 2285
            aload 0 /* this */
            aload 1 /* cp */
            aload 6 /* desc2 */
            invokevirtual javassist.bytecode.ConstPool.addUtf8Info:(Ljava/lang/String;)I
            putfield javassist.bytecode.MethodTypeInfo.descriptor:I
         7: .line 2286
            aload 4 /* cache */
            aload 0 /* this */
            aload 0 /* this */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         8: .line 2288
      StackMap locals:
      StackMap stack:
            return
        end local 6 // java.lang.String desc2
        end local 5 // java.lang.String desc
        end local 4 // java.util.Map cache
        end local 3 // java.lang.String newName
        end local 2 // java.lang.String oldName
        end local 1 // javassist.bytecode.ConstPool cp
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    9     0     this  Ljavassist/bytecode/MethodTypeInfo;
            0    9     1       cp  Ljavassist/bytecode/ConstPool;
            0    9     2  oldName  Ljava/lang/String;
            0    9     3  newName  Ljava/lang/String;
            0    9     4    cache  Ljava/util/Map<Ljavassist/bytecode/ConstInfo;Ljavassist/bytecode/ConstInfo;>;
            1    9     5     desc  Ljava/lang/String;
            2    9     6    desc2  Ljava/lang/String;
    Signature: (Ljavassist/bytecode/ConstPool;Ljava/lang/String;Ljava/lang/String;Ljava/util/Map<Ljavassist/bytecode/ConstInfo;Ljavassist/bytecode/ConstInfo;>;)V
    MethodParameters:
         Name  Flags
      cp       
      oldName  
      newName  
      cache    

  public void renameClass(javassist.bytecode.ConstPool, java.util.Map<java.lang.String, java.lang.String>, java.util.Map<javassist.bytecode.ConstInfo, javassist.bytecode.ConstInfo>);
    descriptor: (Ljavassist/bytecode/ConstPool;Ljava/util/Map;Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=6, args_size=4
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // javassist.bytecode.ConstPool cp
        start local 2 // java.util.Map map
        start local 3 // java.util.Map cache
         0: .line 2294
            aload 1 /* cp */
            aload 0 /* this */
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            invokevirtual javassist.bytecode.ConstPool.getUtf8Info:(I)Ljava/lang/String;
            astore 4 /* desc */
        start local 4 // java.lang.String desc
         1: .line 2295
            aload 4 /* desc */
            aload 2 /* map */
            invokestatic javassist.bytecode.Descriptor.rename:(Ljava/lang/String;Ljava/util/Map;)Ljava/lang/String;
            astore 5 /* desc2 */
        start local 5 // java.lang.String desc2
         2: .line 2296
            aload 4 /* desc */
            aload 5 /* desc2 */
            if_acmpeq 8
         3: .line 2297
            aload 3 /* cache */
            ifnonnull 5
         4: .line 2298
            aload 0 /* this */
            aload 1 /* cp */
            aload 5 /* desc2 */
            invokevirtual javassist.bytecode.ConstPool.addUtf8Info:(Ljava/lang/String;)I
            putfield javassist.bytecode.MethodTypeInfo.descriptor:I
            goto 8
         5: .line 2300
      StackMap locals: java.lang.String java.lang.String
      StackMap stack:
            aload 3 /* cache */
            aload 0 /* this */
            invokeinterface java.util.Map.remove:(Ljava/lang/Object;)Ljava/lang/Object;
            pop
         6: .line 2301
            aload 0 /* this */
            aload 1 /* cp */
            aload 5 /* desc2 */
            invokevirtual javassist.bytecode.ConstPool.addUtf8Info:(Ljava/lang/String;)I
            putfield javassist.bytecode.MethodTypeInfo.descriptor:I
         7: .line 2302
            aload 3 /* cache */
            aload 0 /* this */
            aload 0 /* this */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         8: .line 2304
      StackMap locals:
      StackMap stack:
            return
        end local 5 // java.lang.String desc2
        end local 4 // java.lang.String desc
        end local 3 // java.util.Map cache
        end local 2 // java.util.Map map
        end local 1 // javassist.bytecode.ConstPool cp
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    9     0   this  Ljavassist/bytecode/MethodTypeInfo;
            0    9     1     cp  Ljavassist/bytecode/ConstPool;
            0    9     2    map  Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
            0    9     3  cache  Ljava/util/Map<Ljavassist/bytecode/ConstInfo;Ljavassist/bytecode/ConstInfo;>;
            1    9     4   desc  Ljava/lang/String;
            2    9     5  desc2  Ljava/lang/String;
    Signature: (Ljavassist/bytecode/ConstPool;Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;Ljava/util/Map<Ljavassist/bytecode/ConstInfo;Ljavassist/bytecode/ConstInfo;>;)V
    MethodParameters:
       Name  Flags
      cp     
      map    
      cache  

  public int copy(javassist.bytecode.ConstPool, javassist.bytecode.ConstPool, java.util.Map<java.lang.String, java.lang.String>);
    descriptor: (Ljavassist/bytecode/ConstPool;Ljavassist/bytecode/ConstPool;Ljava/util/Map;)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=4
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // javassist.bytecode.ConstPool src
        start local 2 // javassist.bytecode.ConstPool dest
        start local 3 // java.util.Map map
         0: .line 2309
            aload 1 /* src */
            aload 0 /* this */
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            invokevirtual javassist.bytecode.ConstPool.getUtf8Info:(I)Ljava/lang/String;
            astore 4 /* desc */
        start local 4 // java.lang.String desc
         1: .line 2310
            aload 4 /* desc */
            aload 3 /* map */
            invokestatic javassist.bytecode.Descriptor.rename:(Ljava/lang/String;Ljava/util/Map;)Ljava/lang/String;
            astore 4 /* desc */
         2: .line 2311
            aload 2 /* dest */
            aload 2 /* dest */
            aload 4 /* desc */
            invokevirtual javassist.bytecode.ConstPool.addUtf8Info:(Ljava/lang/String;)I
            invokevirtual javassist.bytecode.ConstPool.addMethodTypeInfo:(I)I
            ireturn
        end local 4 // java.lang.String desc
        end local 3 // java.util.Map map
        end local 2 // javassist.bytecode.ConstPool dest
        end local 1 // javassist.bytecode.ConstPool src
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavassist/bytecode/MethodTypeInfo;
            0    3     1   src  Ljavassist/bytecode/ConstPool;
            0    3     2  dest  Ljavassist/bytecode/ConstPool;
            0    3     3   map  Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;
            1    3     4  desc  Ljava/lang/String;
    Signature: (Ljavassist/bytecode/ConstPool;Ljavassist/bytecode/ConstPool;Ljava/util/Map<Ljava/lang/String;Ljava/lang/String;>;)I
    MethodParameters:
      Name  Flags
      src   
      dest  
      map   

  public void write(java.io.DataOutputStream);
    descriptor: (Ljava/io/DataOutputStream;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // java.io.DataOutputStream out
         0: .line 2317
            aload 1 /* out */
            bipush 16
            invokevirtual java.io.DataOutputStream.writeByte:(I)V
         1: .line 2318
            aload 1 /* out */
            aload 0 /* this */
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            invokevirtual java.io.DataOutputStream.writeShort:(I)V
         2: .line 2319
            return
        end local 1 // java.io.DataOutputStream out
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavassist/bytecode/MethodTypeInfo;
            0    3     1   out  Ljava/io/DataOutputStream;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      out   

  public void print(java.io.PrintWriter);
    descriptor: (Ljava/io/PrintWriter;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // javassist.bytecode.MethodTypeInfo this
        start local 1 // java.io.PrintWriter out
         0: .line 2323
            aload 1 /* out */
            ldc "MethodType #"
            invokevirtual java.io.PrintWriter.print:(Ljava/lang/String;)V
         1: .line 2324
            aload 1 /* out */
            aload 0 /* this */
            getfield javassist.bytecode.MethodTypeInfo.descriptor:I
            invokevirtual java.io.PrintWriter.println:(I)V
         2: .line 2325
            return
        end local 1 // java.io.PrintWriter out
        end local 0 // javassist.bytecode.MethodTypeInfo this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Ljavassist/bytecode/MethodTypeInfo;
            0    3     1   out  Ljava/io/PrintWriter;
    MethodParameters:
      Name  Flags
      out   
}
SourceFile: "ConstPool.java"