[Vm-dev] #pragma export on/off

[Igor Stasenko]

2009/2/20 John M McIntosh <johnmci at smalltalkconsulting.com>:
>
> Well the pattern used  is like so where we ask the operating system to find
> the entry point secCanRenameImage in the SecurityPlugin
> which relies on the plugin either being external, or internal, and if the
> plugin actually has the secCanRenameImage.
> This code enables weak linking....
>
>                sCRIfn = ioLoadFunctionFrom("secCanRenameImage",
> "SecurityPlugin");
>                if (sCRIfn != 0) {
>                        okToRename =  ((sqInt (*)(void))sCRIfn)();
>                        if (!(okToRename)) {
>                                /* begin primitiveFail */
>                                foo->successFlag = 0;
>                                return null;
>                        }
>                }
>

Aha, i see.
The code like above insulting me, and if you remember my previous flow
of thoughts about it, i proposed to add a small API to VM, which lets
plugins/modules to publish symbols by themselves, without need in
relying on C linkage rules.

>
>
> On 19-Feb-09, at 7:52 PM, Igor Stasenko wrote:
>
>>
>> 2009/2/20 Eliot Miranda <eliot.miranda at gmail.com>:
>>>
>>> Hi All,
>>>   anyone know what platform this pragma is aimed at, and whether we still
>>> really, really need it?  It is the source of the bulk of my warnings in the
>>> cog interpreter and I'd love to nuke it.
>>> E.
>>>
>> +1 for nuking it :)
>> As i understand this pragma ensuring that given symbol will appear in
>> module exports table, so other modules could lookup this symbol and
>> call these functions directly.
>> I fail see how such functions could be called directly bypassing rules
>> which ensuring a level of safety for VM - like InterpreterProxy.
>>
>>
>>
>> --
>> Best regards,
>> Igor Stasenko AKA sig.
>
> --
> ===========================================================================
> John M. McIntosh <johnmci at smalltalkconsulting.com>
> Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
> ===========================================================================
>
>
>
>



-- 
Best regards,
Igor Stasenko AKA sig.