Hello,
I'm (trying to) writing a deadlock detection tool.
This works now relatively fine but it generates way too many false
positives
since too many virtual functions are expanded.
To limit this, I want to find out whether a method is called on 'this'
since then I can limit the expansion.
Hence my question: Is there an easy way in BCEL to find out whether a
method is called on 'this' vs on another object?
I tried the following:
I know that ALOAD_0 pushes the this pointer to the stack.
So by using Instruction.consumeStack and Instruction.produceStack, I try
to model the stack and
derive whether the method-call got executed on 'this' or on another object.
However, this fails, at least in the following code fragment
drawObject2((b)?true:false);
which is translated in bytecode to
aload_0[42](1)
aload_0[42](1)
getfield[180](3) 70
ifeq[153](3) -> iconst_0
iconst_1[4](1)
goto[167](3) -> invokespecial 74
iconst_0[3](1)
invokespecial[183](3) 74
Since I only use consumeStack and produceStack (and don't bother with
branches), I put an object on the stack for both iconst instructions
and hence I incorrectly conclude that invokespecial is called on
iconst_1 which isn't this.
Input is appreciated,
Marc
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