Please assist.
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Sent: 05 August 2008 07:33 PM
To: beginners@lists.squeakfoundation.org
Subject: Beginners Digest, Vol 28, Issue 6
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Today's Topics:
1. true/false defined where? (Sean Allen)
2. Re: true/false defined where? (Derek O'Connell)
3. Re: true/false defined where? (Michael Rueger)
4. Re: true/false defined where? (Sean Allen)
5. Re: true/false defined where? (Randal L. Schwartz)
6. Re: true/false defined where? (Sean Allen)
7. Re: Problems getting started with OpenGL in Squeak (Ken G. Brown)
8. Fighting again with MC (Giuseppe Luigi Punzi)
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Message: 1
Date: Tue, 5 Aug 2008 08:48:24 -0400
From: Sean Allen <[EMAIL PROTECTED]>
Subject: [Newbies] true/false defined where?
To: "A friendly place to get answers to even the most basic questions
about Squeak." <beginners@lists.squeakfoundation.org>
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<[EMAIL PROTECTED]>
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where do true and false spring into existence?
i've been poking around and cant figure it out.
------------------------------
Message: 2
Date: Tue, 5 Aug 2008 13:53:18 +0100
From: "Derek O'Connell" <[EMAIL PROTECTED]>
Subject: Re: [Newbies] true/false defined where?
To: "A friendly place to get answers to even the most basic questions
about Squeak." <beginners@lists.squeakfoundation.org>
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1
Have a look in Kernel-Objects
On Tue, Aug 5, 2008 at 1:48 PM, Sean Allen <[EMAIL PROTECTED]>
wrote:
where do true and false spring into existence?
i've been poking around and cant figure it out.
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Message: 3
Date: Tue, 05 Aug 2008 14:54:45 +0200
From: Michael Rueger <[EMAIL PROTECTED]>
Subject: Re: [Newbies] true/false defined where?
To: "A friendly place to get answers to even the most basic questions
about Squeak." <beginners@lists.squeakfoundation.org>
Message-ID: <[EMAIL PROTECTED]>
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Sean Allen wrote:
where do true and false spring into existence?
They have been around longer than some people on this mailing list ;-)
i've been poking around and cant figure it out.
true and false and some of the very few objects known to the VM and they
where instantiated when the parent of all current images was created.
All images are basically cloned and not re-created from source, and
that's why you don't see any initialization code for them, they just
"are".
Hope this doesn't add to any confusion...
Michael
------------------------------
Message: 4
Date: Tue, 5 Aug 2008 09:09:01 -0400
From: Sean Allen <[EMAIL PROTECTED]>
Subject: Re: [Newbies] true/false defined where?
To: "A friendly place to get answers to even the most basic questions
about Squeak." <beginners@lists.squeakfoundation.org>
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
On Aug 5, 2008, at 8:54 AM, Michael Rueger wrote:
Sean Allen wrote:
where do true and false spring into existence?
They have been around longer than some people on this mailing list ;-)
i've been poking around and cant figure it out.
true and false and some of the very few objects known to the VM and
they where instantiated when the parent of all current images was
created.
All images are basically cloned and not re-created from source, and
that's why you don't see any initialization code for them, they just
"are".
Hope this doesn't add to any confusion...
How is this for a confusing answer... it both does and doesnt.
I have a feeling the secret to unraveling that confusion comes from
this:
'true and false and some of the very few objects known to the VM'
does that mean that I can't go and find these variables anywhere? that
they arent true
global variables they are some sort of special global?
------------------------------
Message: 5
Date: Tue, 05 Aug 2008 07:52:50 -0700
From: [EMAIL PROTECTED] (Randal L. Schwartz)
Subject: Re: [Newbies] true/false defined where?
To: Sean Allen <[EMAIL PROTECTED]>
Cc: "A friendly place to get answers to even the most basic questions
about Squeak." <beginners@lists.squeakfoundation.org>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=us-ascii
"Sean" == Sean Allen <[EMAIL PROTECTED]> writes:
Sean> I have a feeling the secret to unraveling that confusion comes from
this:
Sean> 'true and false and some of the very few objects known to the VM'
Sean> does that mean that I can't go and find these variables anywhere?
that
Sean> they arent true global variables they are some sort of special
global?
If you explore "Smalltalk specialObjectsArray", you'll see a special
list of
variables that both the VM and the Smalltalk code have to agree on in
order
to
run. For example, if a primitive wants to return "false", it has to
know what the rest of the Smalltalk image considers the sole instance
of the "False" class.
These items are established in
"SystemDictionary>>#recreateSpecialObjectsArray", the first version of
which
had to be executed essentially "by hand" on the first VM (either the
early
versions of Smalltalk 76 or 80). Since then, this special array has
gotten
its initial values by running it in an already running system, so the
first
few entries there (nil, false, true) are in fact clones of clones of
clones
of
the original handcrafted objects. Of course, there's code on the VM side
that
knows the precise order of this magical array, and this is what allows
them
to
communicate, so you can't just add new things here or change the ordering
without building a corresponding new VM.
