[fpc-devel] Closures

Jonas Maebe jonas.maebe at elis.ugent.be
Tue Jan 12 17:07:09 CET 2016


Blaise wrote on Wed, 09 Dec 2015:

> On 09.03.2015 16:36, Blaise at blaise.ru wrote:

> A) Things that work (at least, expected to -- before the merge):
> 	* accessing outer variables/parameters/Selves from such routines  
> and from routines nested in them;

First of all, thanks for your work, and sorry for the late reaction.

I was wondering whether you could rework the above functionality based  
on the code in ncgnstld.pas/ncgnstmm.pas. That is code which is used  
by the JVM and LLVM code generators to access nested variables. It  
adds all variables that are used by nested routines to a record, and  
then passes a pointer to this record as "parentfp" parameter (since  
those platforms do not have a stack or frame pointer register that can  
be passed on). This seems quite similar to what you're doing with  
load_captured_sym() etc. Alternatively, maybe your code is better and  
that code could be refactored to make use of your routines. I have not  
yet studied your code in detail yet.

One advantage would be that the existing code already handles this too  
(for plain nested routines):

> B) Things that do not work (not planned to be addressed before the merge):
> 	* accessing outer local-variables/parameters/Selves that are  
> located more than one level higher than the nameless routine;


Jonas


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