llvm dev - May 2016 - raw_pwrite_stream on a non-fixed-size buffer?

I wanted to bring this up again. I still try to get access to the 
assembler of a jit-compiled function/module using llvm 3.8 and later. In 
3.8 the interface to addPassesToEmitFile has changed and my old method 
doesn't work any more.

In principle one gets the asm with

targetMachine->addPassesToEmitFile( PM , *OS , 
llvm::TargetMachine::CGFT_AssemblyFile )

where *OS is a raw_pwrite_stream.

The problem is that I only find use cases of raw_pwrite_stream where the 
derived class raw_svector_ostream is initialized on a SmallString, like

SmallString<128> Str;
raw_svector_ostream OS(Str);

However, the assembler of the modules could be arbitrary large (not 
fitting in any finite sized SmallString)

What can I do?

Thanks,
Frank

SmallString template parameter is the initial buffer size, but it resizes
automatically as needed.


2016-05-04 17:47 GMT+03:00 Frank Winter via llvm-dev <
llvm-dev at lists.llvm.org>:
> I wanted to bring this up again. I still try to get access to the
> assembler of a jit-compiled function/module using llvm 3.8 and later. In
> 3.8 the interface to addPassesToEmitFile has changed and my old method
> doesn't work any more.
>
> In principle one gets the asm with
>
> targetMachine->addPassesToEmitFile( PM , *OS ,
> llvm::TargetMachine::CGFT_AssemblyFile )
>
> where *OS is a raw_pwrite_stream.
>
> The problem is that I only find use cases of raw_pwrite_stream where the
> derived class raw_svector_ostream is initialized on a SmallString, like
>
> SmallString<128> Str;
> raw_svector_ostream OS(Str);
>
> However, the assembler of the modules could be arbitrary large (not
> fitting in any finite sized SmallString)
>
> What can I do?
>
> Thanks,
> Frank
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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Thanks! It works.
Frank

On 05/04/2016 10:58 AM, Yaron Keren wrote:
> SmallString template parameter is the initial buffer size, but it
> resizes automaticallyas needed.
>
>
> 2016-05-04 17:47 GMT+03:00 Frank Winter via llvm-dev
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at
lists.llvm.org>>:
>
>     I wanted to bring this up again. I still try to get access to the
>     assembler of a jit-compiled function/module using llvm 3.8 and
>     later. In 3.8 the interface to addPassesToEmitFile has changed and
>     my old method doesn't work any more.
>
>     In principle one gets the asm with
>
>     targetMachine->addPassesToEmitFile( PM , *OS ,
>     llvm::TargetMachine::CGFT_AssemblyFile )
>
>     where *OS is a raw_pwrite_stream.
>
>     The problem is that I only find use cases of raw_pwrite_stream where
>     the derived class raw_svector_ostream is initialized on a
>     SmallString, like
>
>     SmallString<128> Str;
>     raw_svector_ostream OS(Str);
>
>     However, the assembler of the modules could be arbitrary large (not
>     fitting in any finite sized SmallString)
>
>     What can I do?
>
>     Thanks,
>     Frank
>     _______________________________________________
>     LLVM Developers mailing list
>     llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
>     http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>