先占位置，文章还没有写。（遥遥无期）
这个部分有点类似于“屠龙之术”。
“屠龙之术”，意思是指极为高明的技术或本领，但是在现实中用不到。
Class modification problems
- Lots of serialization and deserialization details
- Constant pool management
- missing or unused constants
- constant pool indexes management
- Offsets (jump, exception table, local vars, etc)
- become invalid if method code inserted or removed
- Computing maximum stack size and StackMap
- require a control flow analysis
Approach:
- use the Visitor pattern without using an explicit object model
- completely hide the (de)serialization and constant pool management details
- represent jump offsets by
Labelobjects - automatic computation of the max stack size and StackMap
