Hello all,
I am working on project on V8 for which I need to get all the constants in
a JS program. I need to know where the ASTNodes for the constants is
created.
Although, I have got the subclasses of ASTNode like Statement, Expression
etc. I also found the function which creates Literal AST
Optimized code depends on type feedback, so in this case it'll change
depending on what kinds of things *unoptimized* code has seen for "n".
On Tue, Sep 22, 2015 at 1:21 PM, D T wrote:
> Ahhh, that explains a lot! I wondered what the optimized code is about,
> for those few lines...
>
> However,
Ahhh, that explains a lot! I wondered what the optimized code is about, for
those few lines...
However, is there any indication how often the function is called (how many
loop steps) to produce the same optimized code? Or, a slightly different
question: If I let v8 optimize the same code a few
Thank you both for your answers. It really helped me!
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Functions aren't optimized right away, only when they're detected as "hot".
Try calling your function 1000 times or so in a loop. (The bigger it is,
the less often it needs to be called to be considered "hot"; the details of
that mechanism are rather complicated.)
On Tue, Sep 22, 2015 at 11:46 AM,
On Tue, Sep 22, 2015 at 10:17 AM, Ignacio Queralt
wrote:
> I've read online in a Google V8 presentation that there are the following
> states regarding IC:
> Uninitialized -> Pre-monomorphic -> Monomorphic -> Polymorphic/Megamorphic
> -> Generic
> How should I build an example, or which flag shoul
Sorry, sometimes I even confuse myself ;)
Okay, so I attached the original file I was sent. It states the Raw source
and the "optimized" code (and also uses the crankshaft optimizing compiler
of v8).
Nevertheless, when I try to run the function stated in the Raw code, I do
not get any optimized
As I said before, the runtime profiler has nothing to do with ICs, neither
does optimized code. (Also, there isn't "the IC", there are many ICs,
e.g. function
f(x) { x.a.b.c = 1; } has two LoadICs and one StoreIC.)
The "full compiler" generates unoptimized code for each function the first
time it
On Tue, Sep 22, 2015 at 3:56 AM, Jane Chen wrote:
> I have something similar in my app and I'd like my background thread to
> check the heap statistics to detect that the script is about to run out of
> memory, so that I can terminate it before it actually does.
>
> My problem is that I don't know
Not sure I understand. If nothing is printed, are you sure the function
gets optimised at all?
On 22 September 2015 at 10:42, D T wrote:
> Thanks for your quick answer, Andreas!
>
> So, I got the snippet I showed you avove by mail to look over the ASM code
> (I dont have much experience with Jav
Thanks for your quick answer, Andreas!
So, I got the snippet I showed you avove by mail to look over the ASM code
(I dont have much experience with Javascript ;) ).
When run the d8 as follows:
v8/out/ia32.release/d8 --print_opt_code test.js
With the code printed in the RAW section (slightly modi
Thank you for your answer!
The runtime profiler is the one that decides if a function is hot, right?
I wanted to have a general understanding of how the IC works. How the
profiler runs, detects hot functions, or small functions, to optimize, and
tries to optimize them.
Basically, the Full compil
Currently, the foreground tasks can run wherever the embedder wants to run
them, but in the future, we might require that it's safe to access the
given isolate from foreground tasks.
Background tasks can run wherever the embedder likes, and they will take
care themselves to use locks etc.. to acce
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