llvm dev - Aug 2010 - [LLVMdev] Creating a backend target -- must I modify include/llvm/ADT/Triple.h ?

I'm having a go at writing an LLVM backend for the WDC 65816. The
documentation page on writing an LLVM
backend<http://llvm.org/docs/WritingAnLLVMBackend.html>gives this
example of target registration:

    extern "C" void LLVMInitializeSparcTargetInfo() {
        RegisterTarget<Triple::sparc, /*HasJIT=*/false>
        X(TheSparcTarget, "sparc", "Sparc");
    }

The part I'm wondering about is Triple::sparc. If I'm writing a target
for a
different architecture, is it necessary for that architecture to have an
entry in Triple's ArchType enumeration? The documentation doesn't seem
to
mention anything about adding members to the enumeration; is it an optional
step? Making lots of small changes outside the specific source tree for the
65816 backend is something I'd prefer to avoid just at the moment,
especially since it looks like I'd have to add a fair bit to Triple.cpp as
well.  :-)
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Hi Trip Volpe,
Maybe you can read PIC16 or MSP430 backend, and ask the authors.

2010/8/3 Trip Volpe <mraccident at gmail.com>
> I'm having a go at writing an LLVM backend for the WDC 65816. The
> documentation page on writing an LLVM
backend<http://llvm.org/docs/WritingAnLLVMBackend.html>gives this example
of target registration:
>
>     extern "C" void LLVMInitializeSparcTargetInfo() {
>         RegisterTarget<Triple::sparc, /*HasJIT=*/false>
>         X(TheSparcTarget, "sparc", "Sparc");
>     }
>
> The part I'm wondering about is Triple::sparc. If I'm writing a
target for
> a different architecture, is it necessary for that architecture to have an
> entry in Triple's ArchType enumeration? The documentation doesn't
seem to
> mention anything about adding members to the enumeration; is it an optional
> step? Making lots of small changes outside the specific source tree for the
> 65816 backend is something I'd prefer to avoid just at the moment,
> especially since it looks like I'd have to add a fair bit to Triple.cpp
as
> well.  :-)
> _______________________________________________
> 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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Hello
> The part I'm wondering about is Triple::sparc. If I'm writing a
target for a
> different architecture, is it necessary for that architecture to have an
> entry in Triple's ArchType enumeration?
Generally speaking, yes.
> The documentation doesn't seem to
> mention anything about adding members to the enumeration; is it an optional
> step?
No.  Also note that the document in question can be outdated.

PS: You might want to check existing msp430 & pic16 backends as an example.
-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University