Re: [Help-smalltalk] Correct way to throw exceptions/errors from C to ST

[Roland Plüss]

On 04/08/2015 01:45 PM, Roland Plüss wrote:
> And as far as I know I can't include any code into a <primitive>
> declared method.
>
> I once did the trick with errno type error handling in a module I made
> for Smalltalk but it's cumbersome to use and error prone.
>> <primitive> will execute the Smalltalk code in case the primtive
>> failed.  E.g. for the Array
>>
>> kernel/Array.st-    at: anIndex ifAbsent: aBlock [
>> kernel/Array.st-        "Answer the index-th indexed instance variable of 
>> the receiver"
>> kernel/Array.st-
>> kernel/Array.st-        <category: 'built ins'>
>> kernel/Array.st:        <primitive: VMpr_Object_basicAt>
>> kernel/Array.st-        ^self checkIndexableBounds: anIndex ifAbsent: aBlock
>> kernel/Array.st-    ]
>>
> When exactly does a primitive fail and how can I trigger this from
> inside a cCall? This might actually be abused for a little trick if
> working right.
>
Maybe the question got lost in the mailing list? What does make a
primitive fail as seen from the Smalltalk VM?

-- 
Yours sincerely
Plüss Roland

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