[fpc-pascal] how FPC expects string/interface/variant results?

Tomas Hajny XHajT03 at mbox.vol.cz
Wed Nov 1 15:26:28 CET 2006

Jonas Maebe wrote:
> On 01 Nov 2006, at 14:30, Alexandre Leclerc wrote:
>> - Can you find out how FPC expects string/interface/variant results ?
>> Is there documentation where I could get this information? I think it
>> is about cpu registers, etc. (?)
>> Also, I might ask, how does FPC expect parameters passing? And Methods
>> parameter passing?
> This depends on the used calling convention. Especially on i386 there
> are many different ones. And from time to time this also changes to
> fix compatibility or performance issues. There is no definite
> documentation for this apart from the compiler source (which isn't
> easy to read, in particular if you are not even sure about concepts
> like cpu registers and how they can be used for parameter passing),
> or compiling test programs and looking at the generated assembler
> code (idem).

Although the documentation of calling conventions isn't complete, it's
probably worth to mention, that at least part of this information is
available in our Programmer's Guide (section Calling Conventions/Calling
mechanism). Additional information may be found in our mailing list


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