Thread overview
C++ to D converter based on clang
May 28, 2016
Loïc HAMOT
May 28, 2016
Seb
May 28, 2016
Loïc HAMOT
May 28, 2016
Stefan Koch
May 28, 2016
Hello,

I am working on a C++ to D converter.
The project is opensource, on github : https://github.com/lhamot/CPP2D

Clang is used to parse the C++ code and get the abstract syntax tree. Then I can visit the AST to print it to D language.
Some tricks are used to convert the simplest macros to mixin.

Some C++ features which are not straightforward to convert are already handled, like (A not exhaustive list):
    class
        constructor/destructor
        virtual
        abstract
        override
        initialization list
        call base constructor
    Operator overloading
        member
        free
            left or right
    Template
        function
        function specialization
        class
        class/struct specialization
        class/struct partial specialization
    arrays
        static
        dynamic

Some examples here : https://github.com/lhamot/CPP2D/wiki/Conversion-samples

If somebody is interested to use this software, or to participate, do not hesitate to contact me.

Regards
May 28, 2016
On Saturday, 28 May 2016 at 11:02:37 UTC, Loïc HAMOT wrote:
> Hello,
>
> I am working on a C++ to D converter.
> The project is opensource, on github : https://github.com/lhamot/CPP2D
>
> Clang is used to parse the C++ code and get the abstract syntax tree. Then I can visit the AST to print it to D language.
> Some tricks are used to convert the simplest macros to mixin.
>
> Some C++ features which are not straightforward to convert are already handled, like (A not exhaustive list):
>     class
>         constructor/destructor
>         virtual
>         abstract
>         override
>         initialization list
>         call base constructor
>     Operator overloading
>         member
>         free
>             left or right
>     Template
>         function
>         function specialization
>         class
>         class/struct specialization
>         class/struct partial specialization
>     arrays
>         static
>         dynamic
>
> Some examples here : https://github.com/lhamot/CPP2D/wiki/Conversion-samples
>
> If somebody is interested to use this software, or to participate, do not hesitate to contact me.
>
> Regards

That's a great project! IIRC Walter still searches for someone to convert the dmd backend to D.
Btw do you know about Daniel's porting tool that was used to migrate the dmd frontend to D?
https://github.com/yebblies/magicport2
May 28, 2016
On Saturday, 28 May 2016 at 11:02:37 UTC, Loïc HAMOT wrote:
> Hello,
>
> I am working on a C++ to D converter.
> The project is opensource, on github : https://github.com/lhamot/CPP2D
>
> [...]

Very nice! Looking at your examples, you should know that the default protection in D classes is public.

-Steve
May 28, 2016
On Saturday, 28 May 2016 at 11:02:37 UTC, Loïc HAMOT wrote:
> Hello,
>
> I am working on a C++ to D converter.
> The project is opensource, on github : https://github.com/lhamot/CPP2D
>
> [...]

Interesting!
May 28, 2016
On Saturday, 28 May 2016 at 11:26:23 UTC, Seb wrote:
> On Saturday, 28 May 2016 at 11:02:37 UTC, Loïc HAMOT wrote:
>> Hello,
>>
>> I am working on a C++ to D converter.
>> The project is opensource, on github : https://github.com/lhamot/CPP2D
>>
>> [...]
>>
>> If somebody is interested to use this software, or to participate, do not hesitate to contact me.
>>
>> Regards
>
> That's a great project! IIRC Walter still searches for someone to convert the dmd backend to D.
> Btw do you know about Daniel's porting tool that was used to migrate the dmd frontend to D?
> https://github.com/yebblies/magicport2

I gave a try to magicport2, but I read it is specifically done for DMD. Moreover is seams to have some limitations which don't fit for my needs : template, C++11, ...
I also tried the cpp2d project inside VisualD. But is has also many limitations in the C++ features it can parse (and the parser is pretty hard to extend).
This is why I finally decided to use an existing, robust and reusable C++ parser : clang.

I am far away to be able to convert the full DMD backend, but this is a very interesting challenge!

June 01
On 2016-05-28 13:02, Loïc HAMOT wrote:
> Hello,
>
> I am working on a C++ to D converter.
> The project is opensource, on github : https://github.com/lhamot/CPP2D

Is there a reason to reinvent the wheel instead of contributing to DStep [1]?

[1] https://github.com/jacob-carlborg/dstep

-- 
/Jacob Carlborg
June 01
On Wednesday, 1 June 2016 at 06:45:09 UTC, Jacob Carlborg wrote:
> On 2016-05-28 13:02, Loïc HAMOT wrote:
>> Hello,
>>
>> I am working on a C++ to D converter.
>> The project is opensource, on github : https://github.com/lhamot/CPP2D
>
> Is there a reason to reinvent the wheel instead of contributing to DStep [1]?
>
> [1] https://github.com/jacob-carlborg/dstep

Hello Jacob.
It think DStep and CPP2D have very different objectives.
DStep target C and Objective-C headers, but CPP2D target C++ full source code.

Maybe do you think I could participate to DStep in order to extend it to full C++ source handling?
Yes I could. Like I could participate to VisualD/cpp2d or magicport2 projects.

But the reason why I didn't is I want to test the feasibility of a C++ to D conversion using the clang parser.
Now, I think I passed the proof of concept step, and merge my work in an other project is not out of the question.

June 01
On 2016-06-01 10:55, Loïc HAMOT wrote:

> Hello Jacob.
> It think DStep and CPP2D have very different objectives.
> DStep target C and Objective-C headers, but CPP2D target C++ full source
> code.

No. Targeting C++ is not against the objectives of DStep. C and Objective-C just happens to be what DStep currently supports. It make sense to start with C since it's a subset of both Objective-C and C++. Also, when I started the C++ support in D didn't exist or was very limited.

> Maybe do you think I could participate to DStep in order to extend it to
> full C++ source handling?

Yes ;)

> Yes I could. Like I could participate to VisualD/cpp2d or magicport2
> projects.

Anything that is not using a real front end is a lost cause.

> But the reason why I didn't is I want to test the feasibility of a C++
> to D conversion using the clang parser.

I don't see a reason why it was necessary to create a completely new project for that.

> Now, I think I passed the proof of concept step, and merge my work in an
> other project is not out of the question.

Not sure how easy it would be to integrate in DStep. I'm guessing you're using the C++ API while DStep is written in D and is using the C API.

-- 
/Jacob Carlborg
June 01
On 1/06/2016 9:40 PM, Jacob Carlborg wrote:
>> Yes I could. Like I could participate to VisualD/cpp2d or magicport2
>> projects.
>
> Anything that is not using a real front end is a lost cause.
>

Haha that really depends on your goals.

June 02
On 2016-06-01 14:50, Daniel Murphy wrote:

> Haha that really depends on your goals.

Yeah, I know magicport can translate DMD. The goal there is to translate arbitrary C++ code to D.

-- 
/Jacob Carlborg