llvm dev - Jun 2009 - [LLVMdev] runtime library for jitted code

Dear All,
I am considering a possibility of using LLVM JIT for an algebraic modelling
language. I have already done some prototyping following the Kaleidoscope
tutorial and currently thinking of how to connect the jitted code to a
runtime library (for this language) which I would like to code in C++. If it
was *NIX I would use g++ possibly with '-rdynamic' option as suggested
in
the tutorial to resolve required functions at runtime. However it is not an
option, I am stuck to Windows and Visual C++. One possibility that I have
found is to create llvm::Function objects and use
ExecutionEngine::addGlobalMapping to map them to the implementations. This
works fine but is quite labour-consuming since every library function
required used in jitted code needs to be mapped. Does anyone know a better
way?

Thanks,
Victor
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Hello, Victor
> found is to create llvm::Function objects and use
> ExecutionEngine::addGlobalMapping to map them to the implementations. This
> works fine but is quite labour-consuming since every library function
> required used in jitted code needs to be mapped. Does anyone know a better
> way?
Theoretically you should be able to load the .dll into address space
of the application, "register" it and stuff should magically work. I
am not sure whether this functionality obtained much care recently, so
some bugfixing might be needed.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

Victor Zverovich wrote:
> I am considering a possibility of using LLVM JIT for an algebraic
> modelling language. I have already done some prototyping following the
> Kaleidoscope tutorial and currently thinking of how to connect the
> jitted code to a runtime library (for this language) which I would like
> to code in C++. If it was *NIX I would use g++ possibly with
'-rdynamic'
> option as suggested in the tutorial to resolve required functions at
> runtime. However it is not an option, I am stuck to Windows and Visual
> C++.
Well, backlinking doesn't work on Windows, but you can create a dll for
your runtime and use LLVM's dynamic library interface to load that dll.
I'm doing it that way in my project (http://pure-lang.googlecode.com/,
search for 'sys::DynamicLibrary::' in interpreter.cc) and it works fine
on Windows.

Albert

-- 
Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr.Graef at t-online.de, ag at muwiinfa.geschichte.uni-mainz.de
WWW:    http://www.musikinformatik.uni-mainz.de/ag

Albert Graef <Dr.Graef at t-online.de> writes:
> Victor Zverovich wrote:
>> I am considering a possibility of using LLVM JIT for an algebraic
>> modelling language. I have already done some prototyping following the
>> Kaleidoscope tutorial and currently thinking of how to connect the
>> jitted code to a runtime library (for this language) which I would like
>> to code in C++. If it was *NIX I would use g++ possibly with
'-rdynamic'
>> option as suggested in the tutorial to resolve required functions at
>> runtime. However it is not an option, I am stuck to Windows and Visual
>> C++.
>
> Well, backlinking doesn't work on Windows, but you can create a dll for
> your runtime and use LLVM's dynamic library interface to load that dll.
> I'm doing it that way in my project (http://pure-lang.googlecode.com/,
> search for 'sys::DynamicLibrary::' in interpreter.cc) and it works
fine
> on Windows.
The OP says that he wants to link to a dll coded in C++. Isn't name
mangling the main problem here?

-- 
Óscar

Albert and Anton, thanks for all the answers.
I tried to load a DLL with DynamicLibrary::LoadLibraryPermanently and it
works perfectly, so there is no need to use
ExecutionEngine::addGlobalMapping. However Function objects still need to be
constructed since they are required when creating a call, right?

Victor

2009/6/15 Albert Graef <Dr.Graef at t-online.de>
> Victor Zverovich wrote:
> > I am considering a possibility of using LLVM JIT for an algebraic
> > modelling language. I have already done some prototyping following the
> > Kaleidoscope tutorial and currently thinking of how to connect the
> > jitted code to a runtime library (for this language) which I would
like
> > to code in C++. If it was *NIX I would use g++ possibly with
'-rdynamic'
> > option as suggested in the tutorial to resolve required functions at
> > runtime. However it is not an option, I am stuck to Windows and Visual
> > C++.
>
> Well, backlinking doesn't work on Windows, but you can create a dll for
> your runtime and use LLVM's dynamic library interface to load that dll.
> I'm doing it that way in my project (http://pure-lang.googlecode.com/,
> search for 'sys::DynamicLibrary::' in interpreter.cc) and it works
fine
> on Windows.
>
> Albert
>
> --
> Dr. Albert Gr"af
> Dept. of Music-Informatics, University of Mainz, Germany
> Email:  Dr.Graef at t-online.de, ag at muwiinfa.geschichte.uni-mainz.de
> WWW:    http://www.musikinformatik.uni-mainz.de/ag
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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