How to retrieve the receiver object of method call

[Peng Du]

Hello,

What is the right way to get the receiver object of a Java method call in
the
VM code, considering both the caller, callee can either be interpreted or
compiled?

I tried using the "frame" class and it does have many methods for querying
an interpreted frame, e.g. interpreter_callee_receiver(). But not for
compiled
frame.

By learning related code in SharedRuntime, I wrote the following method. It
works for some calls but fails for the others. Can someone point out what
I have done wrong with the code?

Thanks!

================
static oop retrieve_receiver(JavaThread *thread) {
    HandleMark rm(Thread::current());
    frame stub = thread->last_frame();

    if (!stub.is_java_frame())
      stub = stub.java_sender();

    RegisterMap reg_map(thread);
    frame caller = stub.sender(&reg_map);

    if (caller.is_compiled_frame()) {
      return caller.retrieve_receiver(&reg_map);
    }
    else { // interpreted
        methodOop method;
        if (stub.is_compiled_frame())
            method = thread->callee_target(); // i2c will set this?
        else
            method = stub.interpreter_frame_method();

        return caller.interpreter_callee_receiver(method->signature());
    }
}


- Peng
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