The reason for the question is strictly pedagogical. I am learning
Smalltalk and i am playing with implementation of a Cells type package
ala LISP or pyCells and Cellulose from the Python world.
I do not really expect complete this, as I said its just a learning
exercise.
The question around the instance variables stems from the fact that they
appear to be tantalizingly close to the surface given the fact that the
Browser recognizes undeclared identifiers and asks if they are temps or
instance and then plugs in the code for me.
I am just too new to be able to figure out how to intercept the messages
being sent.
Thanks for the help and suggestions.
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Today's Topics:
1. How to introspect method instance variables (rdmerrio)
2. Re: How to introspect method instance variables
(Michael van der Gulik)
3. Re: How to introspect method instance variables (Yoshiki Ohshima)
----------------------------------------------------------------------
Message: 1
Date: Mon, 24 Aug 2009 21:16:16 -0500
From: rdmerrio <[email protected]>
Subject: [Newbies] How to introspect method instance variables
To: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have defined a method, i.e.,
someMethod
anInstVariable := anotherInstVariable1 + anotherInstVariable2.
I would like to intercept the acceptance of this method by the browser
and programatically determine what instance variables this method is
using so that I can grab these names for other processing tasks.
Additionally, I would really like to be able to determine what instance
variables are being assigned to, for instance, anInstVariable in this
case and which ones are the "independent" instance variables,
anotherInstVariable1 and anotherInstVariable2 in this case.
How can I do this?
Thanks
------------------------------
Message: 2
Date: Tue, 25 Aug 2009 14:34:18 +1200
From: Michael van der Gulik <[email protected]>
Subject: Re: [Newbies] How to introspect method instance variables
To: "A friendly place to get answers to even the most basic questions
about Squeak." <[email protected]>
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
On Tue, Aug 25, 2009 at 2:16 PM, rdmerrio <[email protected]> wrote:
I have defined a method, i.e.,
someMethod
anInstVariable := anotherInstVariable1 + anotherInstVariable2.
I would like to intercept the acceptance of this method by the browser and
programatically determine what instance variables this method is using so
that I can grab these names for other processing tasks.
Additionally, I would really like to be able to determine what instance
variables are being assigned to, for instance, anInstVariable in this case
and which ones are the "independent" instance variables,
anotherInstVariable1 and anotherInstVariable2 in this case.
How can I do this?
Why? What are you trying to achieve? You're talking about some pretty
intrusive techniques. Unless you're developing a code analyser of some sort,
you probably should be looking at a better way of doing what you're doing.
To capture the acceptance of a method (assuming you mean the action that
happens when you press alt+s), you insert a bit of code into
PluggableTextMorph>>accept.
To determine which instance variables are being assigned to, you'll need to
somehow look at the bytecodes. They're not too hard to analyse, but it can
be a bit of work. Alternatively, maybe the refactory browser can help, or
maybe you can look at the intermediate code that the compiler generates.
The bytecodes are described here:
http://burks.bton.ac.uk/burks/language/smaltalk/goldberg/blueb003.htm.
They're in the "Blue book chapter 28" if you need to Google it. You'll want
the "store" bytecodes.
To see real bytecodes, either inspect "Morph>>#basicInitialize" to see a
CompiledMethod, or use the "byteCodes" view in a Browser (hidden behind the
"source" button).
Gulik.
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