Hello ,
Could anybody help me to explain the difference between "
*Uninitialized*" state & "*Pre-monomorphic*" state. I get a description as
following :
"
1. *Uninitialized*: this is a generic stub.
We're in this state when we've never seen any object at a property
access site (which is just another way of saying: when this particular
property access at this particular code location has never been exercised).
This stub does a dynamic lookup; once that lookup is complete, this stub
rewrites the call to the inline cache stub to be a call to a different
stub, the pre-monomorphic one.
2. *Pre-monomorphic*: this is a generic stub.
This also performs a run-time lookup then rewrites the call to be to a
different stub: a customized monomorphic one, which is written just in
time. Why even bother with this state? Because in JS, lots of code is
executed exactly once (setup, initialization). Don't want to go to the
trouble of generating customized, optimized code (the monomorphic stub) for
a property access if it only occurs once.
"
"*Uninitialized*" do a dynamic look up & "*Pre-monomorphic"* do run-time
lookup ? what's the difference ? Could any body show some detailed
information ?
BR
Big thanks
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