Hi,
I have a query regarding the instrumentation of the
constructor. I have read all the archived mail in this
regard, but none of them served useful. I have the
same requirement i.e. put a method call at each method
start and method end. Have already put a try catch for
that. Now the task is to skip super() call before I
put my method call in the constructor.
I have a code that works for 99% of the cases.
for(int j = 1; j < ihs.length; j++)
{
if(ihs[j].getInstruction() instanceof INVOKESPECIAL)
{
il.append(ihs[j], instrumentedPatchList);
break;
}
}
It works for
1)public ABCD(XYZ obj)
{
super(obj);
}
Now a more complicated case
2)public RuleTree(int type, AppCodeAnalyzerMainPanel
mainPanel)
{
super(new DefaultTreeModel(new RuleNode("Rules")));
method1();
method2();
}
The above code fails because the Special Instruction
is not at first position. Hence A refined approach
will be to get the first instruction handle of the
second line in the constructor (first instruction
handle for method1()). Now I scan all the instructions
of the first line (super(new DefaultTreeModel(new
RuleNode("Rules")))). If there is any INVOKESPECIAL in
this list I put my code at the end of first line. This
thing works fine.
A bit more complex case
3)private XYZHandler(EventHandler commandHandler)
{
super(
ABCD.getInstance(),
Helper.getInstance(),
commandHandler,
100);
method1();
}
Now the above mentioned approach doesn't work and I
end up putting my method call before super() and get
VerifyError. Has anyone (especially the ones who have
posted those questions on constructor instrumentation
previously) been able to build a fullproof code?
Thanks,
Nikhil Khedkar
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