llvm dev - Jan 2013 - [LLVMdev] Need some brief explanation about llvm::MemoryBuffer and llvm::SourceMgr

Hello list,

I learned that under LLVM, #including of <iostream> is forbidden.
Instead LLVM provides llvm::raw_ostream(for std::cout, std::cerr) and
llvm::MemoryBuffer(for input stream).

And using of llvm::raw_ostream is pretty easy but for me learning of
how to use llvm::MemoryBuffer is pretty much difficult.

I found a good sample code; utils/yaml2obj/yaml2obj.cpp.
The function, main() in this file provides a hint which is not enough
for me though.

I still cannot figure out how to use llvm::MemoryBuffer.
What I need is just a means of doing std::cin.

Could someone explain about this?

Thank you in advance.
-- 
----------------------------------------
Journeyer J. Joh
o o s a p r o g r a m m e r
a t
g m a i l  d o t  c o m
----------------------------------------

Is this for user prompts, or just reading data from stdin?  You can use
MemoryBuffer::getSTDIN to read the contents of stdin into a memory buffer.
 Then you can get the data pointer and size and read it in.  As far as I
know, there is not a good way to implement user prompts with the LLVM APIs.


On Mon, Jan 14, 2013 at 4:57 AM, Journeyer J. Joh
<oosaprogrammer at gmail.com>wrote:
> Hello list,
>
> I learned that under LLVM, #including of <iostream> is forbidden.
> Instead LLVM provides llvm::raw_ostream(for std::cout, std::cerr) and
> llvm::MemoryBuffer(for input stream).
>
> And using of llvm::raw_ostream is pretty easy but for me learning of
> how to use llvm::MemoryBuffer is pretty much difficult.
>
> I found a good sample code; utils/yaml2obj/yaml2obj.cpp.
> The function, main() in this file provides a hint which is not enough
> for me though.
>
> I still cannot figure out how to use llvm::MemoryBuffer.
> What I need is just a means of doing std::cin.
>
> Could someone explain about this?
>
> Thank you in advance.
> --
> ----------------------------------------
> Journeyer J. Joh
> o o s a p r o g r a m m e r
> a t
> g m a i l  d o t  c o m
> ----------------------------------------
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>


-- 

Thanks,

Justin Holewinski
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Hi Justin Holewinski,
>> As far as I know, there is not a good way to implement user prompts
with the LLVM APIs.
This info helps me a lot.
I tried to do a thing that is not possible.

Thank you very much.

Sincerely
Journeyer

2013/1/15 Justin Holewinski <justin.holewinski at
gmail.com>:
> Is this for user prompts, or just reading data from stdin?  You can use
> MemoryBuffer::getSTDIN to read the contents of stdin into a memory buffer.
> Then you can get the data pointer and size and read it in.  As far as I
> know, there is not a good way to implement user prompts with the LLVM APIs.
>
>
> On Mon, Jan 14, 2013 at 4:57 AM, Journeyer J. Joh <oosaprogrammer at
gmail.com>
> wrote:
>>
>> Hello list,
>>
>> I learned that under LLVM, #including of <iostream> is forbidden.
>> Instead LLVM provides llvm::raw_ostream(for std::cout, std::cerr) and
>> llvm::MemoryBuffer(for input stream).
>>
>> And using of llvm::raw_ostream is pretty easy but for me learning of
>> how to use llvm::MemoryBuffer is pretty much difficult.
>>
>> I found a good sample code; utils/yaml2obj/yaml2obj.cpp.
>> The function, main() in this file provides a hint which is not enough
>> for me though.
>>
>> I still cannot figure out how to use llvm::MemoryBuffer.
>> What I need is just a means of doing std::cin.
>>
>> Could someone explain about this?
>>
>> Thank you in advance.
>> --
>> ----------------------------------------
>> Journeyer J. Joh
>> o o s a p r o g r a m m e r
>> a t
>> g m a i l  d o t  c o m
>> ----------------------------------------
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
>
> --
>
> Thanks,
>
> Justin Holewinski


-- 
----------------------------------------
Journeyer J. Joh
o o s a p r o g r a m m e r
a t
g m a i l  d o t  c o m
----------------------------------------