opencxx-users

[Opencxx-users] parse errors on valid C++

[Stefan S. <se...@sy...>]

hi there,

there are some valid C++ expressions openC++ doesn't
yet understand.

I'v just run into a fairly simple one:

namespace Foo = Bar;

that creates a namespace alias. Is there any chance
that the parser gets fixed to recognize this ?

(I'm also getting a couple of failures in the test suite
  run on my RH9 machine where the parser has problems with
  GNU extensions (I believe), in this case the line is

   extern "C" __typeof(uselocale) __uselocale;
)

Thanks,
		Stefan

Re: [Opencxx-users] parse errors on valid C++

[Grzegorz J. <ja...@he...>]

Hi Stefan,

On Sun, 4 Apr 2004, Stefan Seefeld wrote:

> there are some valid C++ expressions openC++ doesn't
> yet understand.
>
> I'v just run into a fairly simple one:
>
> namespace Foo = Bar;
>
> that creates a namespace alias. Is there any chance
> that the parser gets fixed to recognize this ?

Yes, however parser is not self-healing system. AFAIK I am the only person
doing anything to the code at the moment. I don't have resources to fix it
now.

You hacked OpenC++ already, perhaps you could invest some time in this
fix. Please contact me for arrangements if you decide to do so.

> (I'm also getting a couple of failures in the test suite
>   run on my RH9 machine where the parser has problems with
>   GNU extensions (I believe), in this case the line is
>
>    extern "C" __typeof(uselocale) __uselocale;
> )

This is high priority, however before I get down to it I need to separate
parser, because testing the whole monolith adds huge burden and slows down
anything I do to parser. I am working on the separation now.

Thanks
GJ

##################################################################
# Grzegorz Jakacki                       Huada Electronic Design #
# Senior Engineer, CAD Dept.              1 Gaojiayuan, Chaoyang #
# tel. +86-10-64365577 x2074               Beijing 100015, China #
# Copyright (C) 2004 Grzegorz Jakacki, HED. All Rights Reserved. #
##################################################################

Re: [Opencxx-users] parse errors on valid C++

[Stefan S. <se...@sy...>]

Grzegorz Jakacki wrote:
> Hi Stefan,
> 
> On Sun, 4 Apr 2004, Stefan Seefeld wrote:
> 
> 
>>there are some valid C++ expressions openC++ doesn't
>>yet understand.
>>
>>I'v just run into a fairly simple one:
>>
>>namespace Foo = Bar;
>>
>>that creates a namespace alias. Is there any chance
>>that the parser gets fixed to recognize this ?
> 
> 
> Yes, however parser is not self-healing system. AFAIK I am the only person

heh :-)

> doing anything to the code at the moment. I don't have resources to fix it
> now.
> 
> You hacked OpenC++ already, perhaps you could invest some time in this
> fix. Please contact me for arrangements if you decide to do so.

Fair enough. Attached is a patch that:

* adds a new token ('ntNamespaceAlias'...luckily there are still some slots available ;-)
* adds a new Ptree subclass 'PtreeNamespaceAlias'
* adds a 'rNamespaceAlias' method to the parser that generates such a ptree
* adds a dummy 'TranslateNamespaceAlias' to the Walker base class

What should the parse tree for this declaration look like ?
As I don't know any better, I just generate a simple list

[ 'namespace' <alias> '=' <scoped.name> ';' ]

(where scoped.name can be a list if it's not a simple identifier)

The Walker::TranslateNamespaceAlias() method does nothing (yet), but
should probably register the new alias to the environment. I'll let
others fill that out :-)

Regards,
		Stefan

Re: [Opencxx-users] parse errors on valid C++

[Stefan S. <se...@sy...>]

Stefan Seefeld wrote:
 > Grzegorz Jakacki wrote:

 >> You hacked OpenC++ already, perhaps you could invest some time in this
 >> fix. Please contact me for arrangements if you decide to do so.
 >
 >
 > Fair enough. Attached is a patch that:

Grzegorz,

did you have the time to have a look into the patch ? I'm willing to do
further work with some guidance, as I understand you are quite busy.
I still have write permissions to the opencxx repository, though I'd
prefer to have somebody with better opencxx understanding review my
patches first.

May be at some point I'm also able to help with other issues on your
todo list, such as the refactoring / modularization.

Kind regards,
		Stefan

Re: [Opencxx-users] parse errors on valid C++

[Grzegorz J. <ja...@he...>]

On Thu, 15 Apr 2004, Stefan Seefeld wrote:

> Stefan Seefeld wrote:
>  > Grzegorz Jakacki wrote:
>
>  >> You hacked OpenC++ already, perhaps you could invest some time in this
>  >> fix. Please contact me for arrangements if you decide to do so.
>  >
>  >
>  > Fair enough. Attached is a patch that:
>
> Grzegorz,
>
> did you have the time to have a look into the patch ?

Yes, looks very good, but I had no time to apply it yet, sorry.

> I'm willing to do
> further work with some guidance, as I understand you are quite busy.
> I still have write permissions to the opencxx repository, though I'd
> prefer to have somebody with better opencxx understanding review my
> patches first.

That's great, Stefan. I have just mailed you privately with more info on
that.

> May be at some point I'm also able to help with other issues on your
> todo list, such as the refactoring / modularization.

Fantastic.

BR
Grzegorz

>
> Kind regards,
> 		Stefan
>
>
>
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##################################################################
# Grzegorz Jakacki                       Huada Electronic Design #
# Senior Engineer, CAD Dept.              1 Gaojiayuan, Chaoyang #
# tel. +86-10-64365577 x2074               Beijing 100015, China #
# Copyright (C) 2004 Grzegorz Jakacki, HED. All Rights Reserved. #
##################################################################

Re: [Opencxx-users] parse errors on valid C++

[Stefan S. <se...@sy...>]

Hi Grzegorz,

Grzegorz Jakacki wrote:

 >>(I'm also getting a couple of failures in the test suite
 >>  run on my RH9 machine where the parser has problems with
 >>  GNU extensions (I believe), in this case the line is
 >>
 >>   extern "C" __typeof(uselocale) __uselocale;
 >>)
 >
 >
 > This is high priority, however before I get down to it I need to separate
 > parser, because testing the whole monolith adds huge burden and slows down
 > anything I do to parser. I am working on the separation now.

I just realize that the synopsis port of opencxx already contains
a change to deal with this GNU extension. May be we should try to
merge the appropriate parts back into 'mainline' ? Let me know if
I can help...

On an unrelated note: as you know I'm quite interested into the efford
to separate the different opencxx layers.
As I don't have any theoretical background in compiler / parser techniques,
I'm wondering about the nature of all the ptree related business:
As far as I understand only the very first steps are related to a
parse tree proper. Already the construction of things like 'PtreeNamespaceAlias'
nodes belongs into the 'syntax tree' domain, right ?

I'm asking because I have some difficulties drawing a clear line as to
what the AST I use in synopsis should look like. Right now I only manipulate
declarations, but I can imagine at some point to be more flexible and
provide scripting access to the parsed source code and thus similar to
opencxx's goals provide some means to do meta programming.

Any thoughts ?

Regards,
		Stefan

PS: for those who don't know what I'm talking about:
     http://synopsis.fresco.org