llvm dev - Mar 2016 - Need to help on how to write An LLVM Register Allocator pass

Hello All,

I wanted to write new register allocation pass. To start with, I have used
graph coloring based allocation sample file[Gcra.cpp].  I am tring build
the LLVM after dropping this file into lib/CodeGen, and adding references
to createGcra to include/lib/CodeGen/Passes.h and
include/lib/CodeGen/LinkAllCodeGenComponents.h.

I am getting following error while building the LLVM.
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Sorry, forgot to attach the build error log file.
LLVM build giving following error

/home/iiita/cse231-proj1/llvm/src/lib/CodeGen/Gcra.cpp:172:6: error: use of
undeclared identifier 'createGcra'
                                        createGcra);

I have attached log file for reference.

Any kind of help is appreciated!!

Thanks,
Bala


On Wed, Mar 9, 2016 at 12:40 AM, Balasaheb Dabhade <
dabhadebalasaheb at gmail.com> wrote:
> Hello All,
>
> I wanted to write new register allocation pass. To start with, I have used
> graph coloring based allocation sample file[Gcra.cpp].  I am tring build
> the LLVM after dropping this file into lib/CodeGen, and adding references
> to createGcra to include/lib/CodeGen/Passes.h and
> include/lib/CodeGen/LinkAllCodeGenComponents.h.
>
> I am getting following error while building the LLVM.
>
>
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llvm[2]: Compiling GCMetadataPrinter.cpp for Release+Asserts build
llvm[2]: Compiling GCStrategy.cpp for Release+Asserts build
llvm[2]: Compiling Gcra.cpp for Release+Asserts build
/home/iiita/cse231-proj1/llvm/src/lib/CodeGen/Gcra.cpp:172:6: error: use of
undeclared identifier 'createGcra'
                                        createGcra);
                                        ^
/home/iiita/cse231-proj1/llvm/src/lib/CodeGen/Gcra.cpp:177:22: error:
out-of-line definition of 'createGcra' does not match
      any declaration in namespace 'llvm'
 FunctionPass *llvm::createGcra() 
                     ^~~~~~~~~~
2 errors generated.
make[2]: ***
[/home/iiita/cse231-proj1/llvm/build/lib/CodeGen/Release+Asserts/Gcra.o] Error 1
make[2]: Leaving directory `/home/iiita/cse231-proj1/llvm/build/lib/CodeGen'
make[1]: *** [CodeGen/.makeall] Error 2
make[1]: Leaving directory `/home/iiita/cse231-proj1/llvm/build/lib'
make: *** [all] Error 1