Re: [Pharo-users] Tracking method in and out with MetaLinks

[Marcus Denker via Pharo-users]

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> On 23 Nov 2018, at 15:19, Marcus Denker <marcus.den...@inria.fr> wrote:
> 
> 
> 
>> On 23 Nov 2018, at 14:59, Marcus Denker <marcus.den...@inria.fr> wrote:
>> 
>> 
>> 
>>> On 23 Nov 2018, at 13:40, Manuel Leuenberger <leuenber...@inf.unibe.ch> 
>>> wrote:
>>> 
>>> Hi,
>>> 
>>> I stumbled upon another MetaLink scenario that I am unsure how to 
>>> implement. I want to track method invocations, with receiver, arguments, 
>>> selector, and return value (maybe even signaled exception). I can track the 
>>> method input with a MetaLink installed on an RBMethodNode like this:
>>> 
>>> MetaLink new
>>>  metaObject: [ :c | Transcript show: c receiver; show: c method selector; 
>>> show: c arguments; cr ];
>>>  selector: #value:;
>>>  arguments: #(context).
>>> 
>>> and for returns with a MetaLink on RBReturnNodes like this:
>>> 
>>> MetaLink new
>>>  metaObject: [ :v | Transcript show: v; cr ];
>>>  selector: #value:;
>>>  arguments: #(value)
>>> 
>>> The problem is though, that not all methods have explicit returns, and some 
>>> mix explicit returns and self returns. I tried installed an #after MetaLink 
>>> on a RBMethodNode, but this fails in many cases. Is there any way that I 
>>> can instrument a method and track receiver, selector, arguments, and 
>>> returned value (even if self) at the same time?
>>> 
>> 
>> I am working now on making the #after work so that one can get with #value 
>> the return of the method… 
>> 
>> I now have a version where it works for Message Sends correctly *and* were 
>> #after on Method works better (the compilation errors should be fixed).
>> 
>> But  #value for #after on Method needs some more work… soon!
>> 

#value for methods should now work with this PR loaded:

        https://github.com/pharo-project/pharo/pull/2012 
<https://github.com/pharo-project/pharo/pull/2012>

This is implemented by compiling a wrapped method for #after (just as we do for 
primitives).

        Marcus

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