[Vm-dev] How to access Interpreter code from plugin?

Mariano Martinez Peck marianopeck at gmail.com
Wed Oct 13 16:52:02 UTC 2010

On Wed, Oct 13, 2010 at 6:31 PM, Igor Stasenko <siguctua at gmail.com> wrote:

> Hi, Mariano.
> I don't understand, why you need to dive into specific primitive(s),
> while you can simply place a hook before entering any primitive

is there a way to do this in a genera way or I need to do it manually for
each primitive?

> and
> mark all objects, which passed as parameters
> (receiver & args) as 'used', and then call primitive function?
The problem is that not all of them are "used" in all primitives. Just as an
example, #bytecodeNew:


    messageSelector := self specialSelector: 28.
    argumentCount := 0.
    self normalSend.

I don't want to trace the receiver there, but it is really not used there. I
will trace it in #normalSend.
Or sometimes a primitive fails because one of the arguments is more than
32bits or because it is not smallInteger or whatever...I don't want to mark
them as used just for being a parameter. I want to mark them when they are
really used by the VM.

I want to avoid as much as overhead as possible.

Right now I put the tracing in #normalSend, but then I modifed some
bytecodes like those for #class or #== since they were not going throught
normal send.


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