Who and when do put receiver onto the stack in bytecode interpreter?

[Colin(Du Li)]

Hi, I have a question about the c++ interpreter.
For an "invokevirtual" method, the operand stack is like:
    ..., objectref, [arg1, [arg2 ...]] 

I know the arguments are put onto the stack by some "load" instructions
explicitly. But, how is the objectref (receiver object) put onto the stack?
Who did that and when?

Thanks a lot!

Colin
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