Is there any kind of project or workflow that converts D (subset) to C/CPP ?

On 24/07/2016 12:27 AM, ParticlePeter wrote:
> Is there any kind of project or workflow that converts D (subset) to
> C/CPP ?

This probably will interest you for ldc: http://stackoverflow.com/questions/5180914/llvm-ir-back-to-human-readable-source-language

On Saturday, 23 July 2016 at 12:29:45 UTC, rikki cattermole wrote:
> On 24/07/2016 12:27 AM, ParticlePeter wrote:
>> Is there any kind of project or workflow that converts D (subset) to
>> C/CPP ?
>
> This probably will interest you for ldc: http://stackoverflow.com/questions/5180914/llvm-ir-back-to-human-readable-source-language

Cool, I didn't know that one but I also didn't invest time in LLVM till now.
However, this converts bitcode to C/CPP, my guess would be that the job can be done much better if the original D source would be used in tandem.

On 2016-07-23 14:27, ParticlePeter wrote:
> Is there any kind of project or workflow that converts D (subset) to
> C/CPP ?

No idea about the status but: https://github.com/adamdruppe/tools/blob/dtoh/dtoh.d

-- 
/Jacob Carlborg

On Saturday, 23 July 2016 at 19:20:10 UTC, Jacob Carlborg wrote:
> On 2016-07-23 14:27, ParticlePeter wrote:
>> Is there any kind of project or workflow that converts D (subset) to
>> C/CPP ?
>
> No idea about the status but: https://github.com/adamdruppe/tools/blob/dtoh/dtoh.d

Thanks, I am looking into this, but I think its still not that what I am searching, it seems to create only C/CPP headers for D libs. I would like to have the whole source code transformed.

On Saturday, 23 July 2016 at 12:27:24 UTC, ParticlePeter wrote:
> Is there any kind of project or workflow that converts D (subset) to C/CPP ?

The short answer is no, not for any recent version of D.

On Monday, 25 July 2016 at 07:53:17 UTC, Stefan Koch wrote:
> On Saturday, 23 July 2016 at 12:27:24 UTC, ParticlePeter wrote:
>> Is there any kind of project or workflow that converts D (subset) to C/CPP ?
>
> The short answer is no, not for any recent version of D.

The long answer is it's kind of possible, but the resulting C code is not human-readable.
I just managed today to achieve some transformation to C with the below script:

# compile the D modules to llvm bitcode
$ ldc2 hello.d -c -output-ll -ofhello.ll
$ ldc2 lib.d -c -output-ll -oflib.ll

# merge them into one LLVM bitcode module
$ llvm-link-3.8 hello.ll lib.ll -o full.bc
$ llvm-dis-3.8 full.bc -o=full.ll

# convert bitcode to C
$ llvm-cbe full.ll

# patch the generated C, so it's compilable
$ sed -i "s/.*APInt.*//" full.cbe.c
$ sed -i "s/^uint32_t main(uint32_t llvm_cbe_argc_arg, uint8_t\*\* llvm_cbe_argv_arg)/int main(int llvm_cbe_argc_arg, char** llvm_cbe_argv_arg)/" full.cbe.c
$ sed -i "s/^uint32_t main(uint32_t, uint8_t\*\*)/int main(int, char**)/" full.cbe.c

# compile the C program and run it.
$ gcc -w full.cbe.c -o full.exe -lphobos2
$ ./full.exe
Hello, world: 46

I only tried this with a very minimalistic subset of D at the moment.
Most of the magic occurs in the "llvm-cbe" program, which is a "resurrected LLVM C backend" ( https://github.com/JuliaComputing/llvm-cbe ).

On Saturday, 23 July 2016 at 12:27:24 UTC, ParticlePeter wrote:
> Is there any kind of project or workflow that converts D (subset) to C/CPP ?

Just FYI there is a project that does the reverse.

> Calypso creates a bridge between DMD/LDC and Clang, both at the AST level (DMD <=> Clang's AST, Sema, ...) and at the code generation level (LDC <=> Clang's Codegen) to make D interface directly with the almost full set of C++ features, and no binding is needed.

https://github.com/Syniurge/Calypso