llvm dev - Feb 2016 - raw_pwrite_stream to string or stdout?

TargetMachine::addPassesToEmitFile(..)
requires as its 2nd argument an raw_pwrite_stream.

Is it possible to create such a thing which either writes into a 
standard string or streams to outs() ?

Thanks,

raw_string_ostream is an adaptor for std::string.
raw_svector_ostream is more efficient adaptor for llvm::SmallString.
outs() will not work as it can't seek.


2016-02-19 23:16 GMT+02:00 Frank Winter via llvm-dev <
llvm-dev at lists.llvm.org>:
> TargetMachine::addPassesToEmitFile(..)
> requires as its 2nd argument an raw_pwrite_stream.
>
> Is it possible to create such a thing which either writes into a standard
> string or streams to outs() ?
>
> Thanks,
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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On 19 February 2016 at 16:16, Frank Winter via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> TargetMachine::addPassesToEmitFile(..)
> requires as its 2nd argument an raw_pwrite_stream.
>
> Is it possible to create such a thing which either writes into a standard
> string or streams to outs() ?

I would suggest doing what llc does:

  if ((FileType != TargetMachine::CGFT_AssemblyFile &&
         !Out->os().supportsSeeking()) ||
        CompileTwice) {
      BOS = make_unique<raw_svector_ostream>(Buffer);
      OS = BOS.get();
}

That will work even with redirects.

Cheers,
Rafael

TargetMachine::CGFT_AssemblyFile is exactly what I am trying to write out.

Frank


On 02/22/2016 11:06 AM, Rafael Espíndola wrote:
> On 19 February 2016 at 16:16, Frank Winter via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>> TargetMachine::addPassesToEmitFile(..)
>> requires as its 2nd argument an raw_pwrite_stream.
>>
>> Is it possible to create such a thing which either writes into a
standard
>> string or streams to outs() ?
>
>
> I would suggest doing what llc does:
>
>    if ((FileType != TargetMachine::CGFT_AssemblyFile &&
>           !Out->os().supportsSeeking()) ||
>          CompileTwice) {
>        BOS = make_unique<raw_svector_ostream>(Buffer);
>        OS = BOS.get();
> }
>
> That will work even with redirects.
>
> Cheers,
> Rafael
>