llvm dev - Sep 2012 - [LLVMdev] Create target with alternate syntax for globals?

I'm working on building a target for llvm that's the intermediate
language
of another compiler, so that the other compiler can benifit from llvm's
optimization passes.

I essentially made a copy of the mips backend, and then started changing
the output to match the intermediate language of the compiler.  Most of the
output can be overriden, but I haven't figured out how to change the way
globals are emitted.

The AsmPrinter::EmitGlobalVariable function in the
llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp file is not virtual; if I try to
override it, I get a "multiple definitions" error.  To emit the
global, it
just calls the OutputStreamer.EmitCommonSymbol method.  Again, this has
become a problem because I don't want the default output for global
symbols. If I can't override this method, how can I change the way that my
target outputs globals variables?
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Update for anyone else that comes across this: You have to register an ASM
streamer, and overide the EditCommonSymbol method.

On Sat, Sep 8, 2012 at 9:07 AM, ryan baird <ryanrbaird at gmail.com>
wrote:
> I'm working on building a target for llvm that's the intermediate
language
> of another compiler, so that the other compiler can benifit from llvm's
> optimization passes.
>
> I essentially made a copy of the mips backend, and then started changing
> the output to match the intermediate language of the compiler.  Most of the
> output can be overriden, but I haven't figured out how to change the
way
> globals are emitted.
>
> The AsmPrinter::EmitGlobalVariable function in the
> llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp file is not virtual; if I try to
> override it, I get a "multiple definitions" error.  To emit the
global, it
> just calls the OutputStreamer.EmitCommonSymbol method.  Again, this has
> become a problem because I don't want the default output for global
> symbols. If I can't override this method, how can I change the way that
my
> target outputs globals variables?
>
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2012/9/9 ryan baird <ryanrbaird at gmail.com>:
> I'm working on building a target for llvm that's the intermediate
language
> of another compiler, so that the other compiler can benifit from llvm's
> optimization passes.
>
> I essentially made a copy of the mips backend, and then started changing
the
> output to match the intermediate language of the compiler.  Most of the
> output can be overriden, but I haven't figured out how to change the
way
> globals are emitted.
>
> The AsmPrinter::EmitGlobalVariable function in the
> llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp file is not virtual; if I try to
> override it, I get a "multiple definitions" error.  To emit the
global, it
> just calls the OutputStreamer.EmitCommonSymbol method.  Again, this has
> become a problem because I don't want the default output for global
symbols.
> If I can't override this method, how can I change the way that my
target
> outputs globals variables?
Ryan,

On which version are you working? I can see, since r93858;

Author: Chris Lattner <sabre at nondot.org>
Date:   Tue Jan 19 14:38:33 2010

+    virtual void EmitGlobalVariable(const GlobalVariable *GV);

It seems XCoreAsmPrinter overrides some methods.

...Takumi

I'm working on 3.1.   For now I added a custom AsmStreamer, but it's
nice
to know that this will be fixed in 3.2.

On Sat, Sep 8, 2012 at 6:50 PM, NAKAMURA Takumi <geek4civic at
gmail.com>wrote:
> 2012/9/9 ryan baird <ryanrbaird at gmail.com>:
> > I'm working on building a target for llvm that's the
intermediate
> language
> > of another compiler, so that the other compiler can benifit from
llvm's
> > optimization passes.
> >
> > I essentially made a copy of the mips backend, and then started
changing
> the
> > output to match the intermediate language of the compiler.  Most of
the
> > output can be overriden, but I haven't figured out how to change
the way
> > globals are emitted.
> >
> > The AsmPrinter::EmitGlobalVariable function in the
> > llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp file is not virtual; if I
try
> to
> > override it, I get a "multiple definitions" error.  To emit
the global,
> it
> > just calls the OutputStreamer.EmitCommonSymbol method.  Again, this
has
> > become a problem because I don't want the default output for
global
> symbols.
> > If I can't override this method, how can I change the way that my
target
> > outputs globals variables?
>
> Ryan,
>
> On which version are you working? I can see, since r93858;
>
> Author: Chris Lattner <sabre at nondot.org>
> Date:   Tue Jan 19 14:38:33 2010
>
> +    virtual void EmitGlobalVariable(const GlobalVariable *GV);
>
> It seems XCoreAsmPrinter overrides some methods.
>
> ...Takumi
>
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