On 2013/12/03 15:47:02, titzer wrote:
On 2013/12/03 15:27:32, Michael Starzinger wrote:
> Not LGTM, adding Ben as a reviewer.
>
> Ben spent several hours making sure that OSR code is _not_ installed in
> JSFunction objects. This change completely defeats and breaks that
invariant,
by
> bypassing the choking point that was introduced. I agree that we might
want
to
> cache OSR code, but we don't want to install it in JSFunction objects.
>
>
https://codereview.chromium.org/100613004/diff/20001/src/code-stubs-hydrogen.cc
> File src/code-stubs-hydrogen.cc (right):
>
>
https://codereview.chromium.org/100613004/diff/20001/src/code-stubs-hydrogen.cc#newcode1195
> src/code-stubs-hydrogen.cc:1195: // case, it's probably a good idea to
just
> reuse that OSR code right now.
> I strongly disagree that this is a good idea! Once Ben's work is done,
it
will
> be incorrect to do that. This will just take whatever code is in the
> optimized_map and smash it into the JSFunction. OSR code should not be
installed
> into JSFunctions at all.
By the way, I just remembered that we have hydrogenized code that checks
the
optimized code map something like FastNewClosureStub; that's bad since
even if
you fix it here, that stub might find OSR code.
I'm kind of thinking you might want a separate cache of OSR-compiled code,
which
we sort of already have hanging around in the compiler itself in the
queues
between the compiler thread and the main thread. I suggest repurposing
that to
cache the OSR code for a limited time.
IIRC the optimized code map is cleared by the GC at various times, so the
lifetime of that cache should be similar.
As Michael pointed out, I am retarded. This comment is _in_ the callee of
this
function. :)
https://codereview.chromium.org/100613004/
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