llvm dev - May 2017 - llvm::GlobalVariable usage (newbie question)

The docs are pretty vague about this. After digging into the examples I got
the following to work with JIT to gain a pointer to variable elsewhere in
the runtime, but I'd like to understand what is going on here, and if there
is a, um, nicer API that I'm missing?

    llvm::Value* C::getGlobalVariable(const char* name,
                                      llvm::Type* t)
    {

        auto global = _module->getNamedGlobal(name);
        if (!global) {
            new llvm::GlobalVariable(
                *_module,
                t,
                true, // constant
                llvm::GlobalValue::ExternalLinkage,
                nullptr, // no initializer
                name);
            global =  _module->getNamedGlobal(name);
        }
        return global;
    }

Cheers,

  -- nikodemus
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On 30 May 2017 at 12:39, Nikodemus Siivola via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> The docs are pretty vague about this. After digging into the examples I got
> the following to work with JIT to gain a pointer to variable elsewhere in
> the runtime, but I'd like to understand what is going on here, and if
there
> is a, um, nicer API that I'm missing?
Have you looked at Module::getOrInsertGlobal? It seems to be pretty
much exactly what you're doing.

Cheers.

Tim.

No, thanks for the hint!


On Tue, May 30, 2017 at 10:58 PM, Tim Northover <t.p.northover at
gmail.com>
wrote:
> On 30 May 2017 at 12:39, Nikodemus Siivola via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > The docs are pretty vague about this. After digging into the examples
I
> got
> > the following to work with JIT to gain a pointer to variable elsewhere
in
> > the runtime, but I'd like to understand what is going on here, and
if
> there
> > is a, um, nicer API that I'm missing?
>
> Have you looked at Module::getOrInsertGlobal? It seems to be pretty
> much exactly what you're doing.
>
> Cheers.
>
> Tim.
>
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