Bytecode Instrumentation

| 2004 JavaOne
SM
Conference | Session 3042 Copyright Hewlett Packard Co., 2004.
28
Using java_crw_demo(): 19 Parameters
1. Caller assigned class number for class
2. Internal class name
• Example: java/lang/Object (use “/” separator)
3. Pointer to class file image for the class
4. Length of the class file in bytes
5. Set to 1 if this is a system class
• Prevents injections into empty <clinit>, finalize, and <init> methods
6. Class that has methods to call at the injection sites (tclass)
7. Signature of tclass
• Format: "L" + tclass_name + ";"
8. Method name in tclass to call at offset 0 for every method
9. Signature of this method
• Format: "(II)V"