Bytecode Instrumentation

| 2004 JavaOne

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

MyTransformer.traceMethod() – 1

Create the instruction list

private static Method traceMethod(Method m, int methodIndex) {

Code code = m.getCode();

int flags = m.getAccessFlags();

String name = m.getName();

// Create instruction list to be inserted at method start.

InstructionList patch = new InstructionList();

patch.append(new PUSH(cp, 0));

patch.append(new PUSH(cp, methodIndex));

patch.append(new INVOKESTATIC(monitoringMethodToCall));

// Get the bytecode instruction list

MethodGen mg = new MethodGen(m, class_name, cp);

InstructionList il = mg.getInstructionList();

InstructionHandle[] ihs = il.getInstructionHandles();