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On 5/23/2011 11:14, Mariano Martinez Peck wrote:
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Excellent point. Thanks Andreas. I am serializing to disk a CM and
I want to be sure it will work when I materialize it and load back
later on in an image (it can be even a different image). So, I
guess that the externalPrimitiveTable can change and even more the
module of such named primitive may not be loaded at that time.<br>
<br>
So, it is correct so assume that the safest approach is to put a
zero as function index ? this way it will always work?<br>
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Yes.<br>
- A.<br>
<br>
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cite="mid:BANLkTikjv5gD0ZiMGAHuLa5hxpVRyxmgoA@mail.gmail.com"
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Thanks!<br>
<br>
Mariano<br>
<br>
<div class="gmail_quote">On Mon, May 23, 2011 at 10:09 AM, Andreas
Raab <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:andreas.raab@gmx.de">andreas.raab@gmx.de</a>></span>
wrote:<br>
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<div bgcolor="#ffffff" text="#000000"> See the comment in
Interpreter>>primitiveExternalCall.<br>
<br>
primitiveExternalCall<br>
"Call an external primitive. The external primitive
methods <br>
contain as first literal an array consisting of: <br>
* The module name (String | Symbol) <br>
* The function name (String | Symbol) <br>
* The session ID (SmallInteger) [OBSOLETE] <br>
* The function index (Integer) in the
externalPrimitiveTable <br>
For fast failures the primitive index of any method
where the <br>
external prim is not found is rewritten in the method
cache <br>
with zero. This allows for ultra fast responses as long
as the <br>
method stays in the cache. <br>
The fast failure response relies on lkupClass being
properly <br>
set. This is done in <br>
#addToMethodCacheSel:class:method:primIndex: to <br>
compensate for execution of methods that are looked up
in a <br>
superclass (such as in primitivePerformAt). <br>
With the latest modifications (e.g., actually flushing
the <br>
function addresses from the VM), the session ID is
obsolete. <br>
But for backward compatibility it is still kept around.
Also, a <br>
failed lookup is reported specially. If a method has
been <br>
looked up and not been found, the function address is
stored <br>
as -1 (e.g., the SmallInteger -1 to distinguish from <br>
16rFFFFFFFF which may be returned from the lookup). <br>
It is absolutely okay to remove the rewrite if we run
into any <br>
problems later on. It has an approximate speed
difference of <br>
30% per failed primitive call which may be noticable but
if, <br>
for any reasons, we run into problems (like with J3) we
can <br>
always remove the rewrite. <br>
"<br>
<br>
<br>
On 5/23/2011 10:03, Mariano Martinez Peck wrote:
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Hi folks. I was inspecting for example the CM of Integer
>> #bitAnd: and the first literal is an array like
this: #(#LargeIntegers #primDigitBitAnd 0 17)<br>
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I understand the first and the second elements, but I
don't the third and the fourth. What are they? (0 and 17)
because then even seem to change their value.<br>
<br>
I am asking because I am serializing CompiledMethod and
then at materialization time I am putting just two zeros
for the moment. But I am not sure what they mean.<br>
<br>
Thanks in advance,<br clear="all">
<br>
-- <br>
Mariano<br>
<a moz-do-not-send="true"
href="http://marianopeck.wordpress.com" target="_blank">http://marianopeck.wordpress.com</a><br>
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<br>
-- <br>
Mariano<br>
<a moz-do-not-send="true" href="http://marianopeck.wordpress.com"
target="_blank">http://marianopeck.wordpress.com</a><br>
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