[drlvm] how does drlvm insert the safe point into a method

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Hi, I have a question about jit compiler in drlvm. I want to suspend the thread 
manually on a particular point. I know that the thread can only be suspended at 
safe point. I guess the safe point is inserted by jit compiler when it compile 
the method, but I can't prove it from the source code. So my question is 
whether it's true that it is the jit compiler which insert the safe point. If 
it is true, how does it do this?
Thank you for your help.