/** visit end method for intrumentation */
@Override
public void visitEnd() {
for (Object o : methods) {
MethodNode mn = (MethodNode) o;
// filtering the methods
if (!(validateMapReduceClinitMethod(mn.name, MAP_METHOD, REDUCE_METHOD, CLINIT_METHOD)
|| checkMethodNameAndArgumentLength(mn)
|| (mn.access & Opcodes.ACC_SYNTHETIC) == Opcodes.ACC_SYNTHETIC)) {
InsnList insnList = mn.instructions;
AbstractInsnNode[] insnArr = insnList.toArray();
// adding entry logging
logger.info(
MessageFormat.format(
InstrumentationMessageLoader.getMessage(MessageConstants.LOG_METHOD_ENTRY),
getClassName() + "##" + mn.name + "##" + mn.desc));
String logMsg = InstrumentationMessageLoader.getMessage(MessageConstants.ENTERED_METHOD);
String cSymbol = env.getClassSymbol(getClassName());
String mSymbol = env.getMethodSymbol(getClassName(), cSymbol, mn.name);
InsnList il = InstrumentUtil.addLogMessage(cSymbol, mSymbol, logMsg);
insnList.insertBefore(insnList.getFirst(), il);
for (AbstractInsnNode abstractInsnNode : insnArr) {
if (Opcodes.RETURN >= abstractInsnNode.getOpcode()
&& Opcodes.IRETURN <= abstractInsnNode.getOpcode()) {
// adding exit logging
logger.info(
MessageFormat.format(
InstrumentationMessageLoader.getMessage(MessageConstants.LOG_METHOD_EXIT),
getClassName() + "##" + mn.name));
logMsg = InstrumentationMessageLoader.getMessage(MessageConstants.EXITING_METHOD);
cSymbol = env.getClassSymbol(getClassName());
mSymbol = env.getMethodSymbol(getClassName(), cSymbol, mn.name);
il = InstrumentUtil.addLogMessage(cSymbol, mSymbol, logMsg);
// inserting the list at the associated label node
AbstractInsnNode prevNode = abstractInsnNode.getPrevious();
while (!(prevNode instanceof LabelNode)) {
prevNode = prevNode.getPrevious();
}
insnList.insert(prevNode, il);
}
}
}
mn.visitMaxs(0, 0);
}
accept(cv);
}
/**
* * checks whether a method is init or not and if its init then its argument length should be
* zero
*
* @param mn methodnode for obtaining name from a methodnode
* @return true
*/
private boolean checkMethodNameAndArgumentLength(MethodNode mn) {
return (InstrumentUtil.validateMethodName(mn.name, INIT_METHOD)
&& Type.getArgumentTypes(mn.desc).length == 0);
}
/**
* * it checks for main,reduce,clinit methods in instructions.
*
* @param name, name of the method to check
* @param mainMethod, main Method instruction in ASM
* @param reduceMethod, reduce method instruction in ASM
* @param clinitMethod, clinit method instruction in ASM
* @return
*/
private boolean validateMapReduceClinitMethod(
String name, String mainMethod, String reduceMethod, String clinitMethod) {
return InstrumentUtil.validateMethodName(name, mainMethod)
|| InstrumentUtil.validateMethodName(name, reduceMethod)
|| InstrumentUtil.validateMethodName(name, clinitMethod);
}