[LLVMdev] Add a backend

[Daniel Dilts]

That appears to be very thorough.  Thank you for the link.  It isn't that I
am not willing to go through the documentation provided by LLVM and figure
out what is missing, I find, though, that it is much faster if I accumulate
as much documentation as possible up front.

On Sat, Mar 14, 2015 at 4:22 AM, suyog sarda <sardask01 at gmail.com> wrote:

> Hi,
>
> There is a good documentation for writing a backend for sample
> architecture CPU0.
>
> Please refer this pdf
>
>
> https://www.google.co.in/url?sa=t&source=web&rct=j&ei=xhkEVaH-DJO2uATshIKIBw&url=http://jonathan2251.github.io/lbd/TutorialLLVMBackendCpu0.pdf&ved=0CBsQFjAA&usg=AFQjCNFZR2uFivZlsfCuZbMzyJmKJUV7Vg
>
> Regards,
> Suyog
> Is there documentation somewhere about exactly what the function is
> supposed to do, or do I have to figure it out from existing examples?
>
> On Sat, Mar 14, 2015 at 12:13 AM, Anton Korobeynikov <
> anton at korobeynikov.info> wrote:
>
>> You have to provide this function and initialize the whole MC
>> infrastructure.
>>
>> See e.g. lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
>>
>> On Sat, Mar 14, 2015 at 10:11 AM, Daniel Dilts <diltsman at gmail.com>
>> wrote:
>> > Yes, llvm::InitializeAllTargetMCs(void) does seem to be autogenerated.
>> It
>> > is _LLVMInitializeFooTargetMC that I can't find documented anywhere.
>> >
>> > On Sat, Mar 14, 2015 at 12:05 AM, Anton Korobeynikov
>> > <anton at korobeynikov.info> wrote:
>> >>
>> >> This function is autogenerated. You need also to change top-level
>> >> configure / cmake files.
>> >>
>> >> On Sat, Mar 14, 2015 at 8:38 AM, Daniel Dilts <diltsman at gmail.com>
>> wrote:
>> >> > In attempting to add a backend I came across the documentation here:
>> >> > http://llvm.org/docs/WritingAnLLVMBackend.html
>> >> >
>> >> > The section on the build system seems to be out of date, or maybe I
>> >> > don't
>> >> > understand it.  I copied the Sparc target to a directory (Foo for the
>> >> > example), added Foo to the subdirectories list in
>> >> > llvm\lib\Target\LLVMBuild.txt and to LLVM_ALL_TARGETS in
>> >> > llvm\CMakeLists.txt.  I removed the files except for
>> >> > FooTargetMachine.cpp
>> >> > and FooTargetMachine.h.
>> >> >
>> >> > FooTargetMachine is not completed yet, but I was trying to compile
>> and
>> >> > get
>> >> > linker errors about _LLVMInitializeFooTargetMC referenced in function
>> >> > void
>> >> > llvm::InitializeAllTargetMCs(void).  I do not see anything about how
>> to
>> >> > implement this function.
>> >> >
>> >> > Is there additional documentation about how to implement a backend
>> that
>> >> > I am
>> >> > missing?
>> >> >
>> >> > _______________________________________________
>> >> > LLVM Developers mailing list
>> >> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> >> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> With best regards, Anton Korobeynikov
>> >> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>> >
>> >
>>
>>
>>
>> --
>> With best regards, Anton Korobeynikov
>> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>>
>
>
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