Bytecode Instrumentation

| 2004 JavaOne

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

java_crw_demo BCI Library

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C library in 5.0 JRE used by HPROF and other JVMTI agents

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BCI support: [O’Hair]

─ Class initialization

─ Entry to the java.lang.Object init method (signature "()V")

─ Inject invokestatic call to tclass.obj_init_method(object)

─ Method instrumentation

─ Entry

– Inject invokestatic call to

tclass.call_method(class_num,method_num)

– Map the class_num and method_num using the crw library

─ Return (each site)

– Inject invokestatic call to

tclass.return_method(class_num,method_num)

─ newarray type opcode

─ Duplicate array object on the stack

─ Inject invokestatic call to tclass.newarray_method(object)