[llvm-dev] raw_pwrite_stream on a non-fixed-size buffer?

Yaron Keren via llvm-dev llvm-dev at lists.llvm.org
Wed May 4 07:58:21 PDT 2016


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
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