Bytecode Instrumentation

| 2004 JavaOne

Conference | Session 3042 Copyright Hewlett Packard Co., 2004.

java_crw_demo

Example: Injection at Method Entry

•

injection_template

─ Insertion of the actual bytecodes

•

entry_injection_code - create injection code at entry to a method

─ injection_template

•

method_inject_and_write_code

─ entry_injection_code

─ Write bytecode image

•

method_write_bytecodes

─ method_inject_and_write_code

─ Adjust all offsets:

─ Code length

─ Maximum stack

─ Exception table

─ Code attributes

─ Attribute length