[LLVMdev] Dynamically loading native code generated from LLVM IR

[Amara Emerson]

It's definitely there. It was added in r165246 recently so you
probably have an older version.

Amara

On 13 October 2012 23:02, Armin Steinhoff <as at steinhoff-automation.com> wrote:
> Daniel,
>
> I didn't find the MCJIT directory under unitests/ExecutionEngine ... there
> is only a directory called JIT.
> You mean this directory ?
>
> Many thanks
>
> --Armin
>
>
>
>
> Malea, Daniel wrote:
>>
>> Take a look at the MCJIT unit tests under unittests/ExecutionEngine/MCJIT
>>
>> The MCJITTestBase class does the majority of the interactions with the
>> LLVM API you're referring to.
>>
>> Good luck,
>> Dan
>>
>> On 2012-10-13, at 4:57 AM, "Armin Steinhoff" <as at steinhoff-automation.com>
>> wrote:
>>
>>> Kaylor,
>>>
>>> do you have some good documented example code which shows the usage of
>>> the MCJIT ?
>>> This would help a lot ... the sematic of lots of API calls are not
>>> intuitively understandable.
>>>
>>> Best Regards
>>>
>>> --Armin
>>>
>>>
>>>
>>> Kaylor, Andrew wrote:
>>>>
>>>> I'm not sure I understand your use case, but MCJIT (as opposed to the
>>>> legacy JIT) does almost exactly what you're asking for.  It generates an
>>>> in-memory object file image (using addPassesToEmitMC) and then loads and
>>>> links it for execution.
>>>>
>>>> If there's some particular detail you don't like in the way this is
>>>> happening, you might be able to generate a file as you have and then use the
>>>> RuntimeDyld interface to load it.  The llvm-rtdyld tool does something like
>>>> this.
>>>>
>>>> -Andy
>>>>
>>>> -----Original Message-----
>>>> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
>>>> On Behalf Of Baris Aktemur
>>>> Sent: Thursday, October 11, 2012 11:58 PM
>>>> To: llvmdev at cs.uiuc.edu
>>>> Subject: [LLVMdev] Dynamically loading native code generated from LLVM
>>>> IR
>>>>
>>>> Hi,
>>>>
>>>> I'm building LLVM IR. I'd like to compile this IR to native code (I
>>>> don't want JIT) and immediately load it to execute. So far, I've the
>>>> following:
>>>>
>>>> 1) I can emit the IR to native assembly/object file doing the same thing
>>>> llc does (using TargetMachine::addPassesToEmitFile).
>>>> 2) I can dynamically load a precompiled .so file (using
>>>> llvm::sys::DynamicLibrary::getPermanentLibrary), get a function pointer from
>>>> that file, and execute.
>>>>
>>>> I can't dynamically load the .o file I produce in step 1 because it's a
>>>> static library. If I could produce a .so file in step 1, my problem would be
>>>> solved. llc has a "-relocation-model=pic" option, but the file produced with
>>>> that did not dynamically load. I got lost in clang's options when trying to
>>>> find where the "-shared" and "-fPIC" options are used.
>>>>
>>>> So, my question is: Which API should I look at to emit dynamically
>>>> loadable native code from LLVM IR?
>>>>
>>>> I would also like to emit code to an in-memory stream instead of a file
>>>> because everything happens at runtime, but that's a secondary concern.
>>>>
>>>> Thanks in advance.
>>>>
>>>> -Baris Aktemur
>>>>
>>>>
>>>>
>>>>
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