[llvm-dev] How to set Target/Triple of ExecutionEngine

[edA-qa mort-ora-y via llvm-dev]

Yes, I think ordering was a problem. I've moved my target machine setup
to immediately after creating the `Module` now, before adding any IR,
and it seems to work.

    module = new llvm::Module( "test", *llvm_context );
    module->setTargetTriple( platform::target->triple );
   
    std::string err_str;
    auto triple_str = llvm::Triple::normalize(platform::target->triple);
    llvm::Target const *  target = llvm::TargetRegistry::lookupTarget(
triple_str, err_str );
    STATE_CHECK( target, err_str );
    auto targetMachine = target->createTargetMachine(triple_str,
"generic", "", llvm::TargetOptions{},
        llvm::Optional<llvm::Reloc::Model>());
   
    module->setDataLayout( targetMachine->createDataLayout() );


On 19/04/18 21:52, Lang Hames wrote:
> Hi edaqa,
>
> You might need to set your TargetOptions before calling selectTarget. E.g.
>
> builder.setTargetOptions(Opts).selectTarget(...);
>
> Or you could just let EngineBuilder call selectTarget for you (which
> is what the no-argument version of EngineBuilder::create does):
>
> llvm::ExecutionEngine * ee = builder.
>         setErrorStr( &errStr ).
>         setEngineKind( llvm::EngineKind::JIT ).
>         setTargetOptions( topts ).
>         setMArch(arch).
>         setMAttrs(mattrs).
>         create();
>
> If those are still failing, it would be interesting to get the data
> layout string that you are getting from the ExecutionEngine instance
> and compare it to what you are expecting.
>
> Cheers,
> Lang.
>
> On Thu, Apr 19, 2018 at 1:56 AM, edA-qa mort-ora-y via llvm-dev
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>
>     Taking one step back, I'm not clear I'm even setting the
>     triple/DataLayout on the module correctly:
>
>         module = new llvm::Module( "test", *llvm_context );
>         module->setTargetTriple( platform::target->triple );
>
>     Is that enough to create an appropriate DataLayout for the module?  I
>     don't see anyway to convert a triple to a DataLayout, so I can't call
>     `setDataLayout`.
>
>
>     On 19/04/18 10:44, edA-qa mort-ora-y via llvm-dev wrote:
>     > I don't know if I'm setting the triple of my execution engine
>     > correctly.  This is leading to an issue where a struct
>     `{i8,i64}` is not
>     > getting the same layout as the ABI expects.
>     >
>     > I setup my engine/module like this:
>     >
>     >      llvm::SmallVector<std::string,2> mattrs;
>     >      llvm::EngineBuilder builder{
>     unique_ptr<llvm::Module>(module) };
>     >      llvm::ExecutionEngine * ee = builder.
>     >         setErrorStr( &errStr ).
>     >         setEngineKind( llvm::EngineKind::JIT ).
>     >         setTargetOptions( topts ).
>     >         create(builder.selectTarget(
>     > llvm::Triple(llvm::Triple::normalize(platform::target->triple)),
>     "", "",
>     > mattrs ));
>     >
>     >     module->setDataLayout( ee->getDataLayout() );
>     >
>     > Where `module` is my `llvm::Module` with the generated IR code.
>     >
>     > I'm using the triple `x86_64-pc-linux-gnu`, the same as clang on the
>     > machine, but getting different alignments. I'm assuming the above is
>     > somehow not creating the correct layout. Perhaps there's an
>     ordering issue?
>     >
>
>     -- 
>     edA-qa mort-ora-y 
>             http://mortoray.com/
>
>     Creator of the Leaf language
>             http://leaflang.org/
>
>     Streaming algorithms, AI, and design on Twitch
>             https://www.twitch.tv/mortoray
>
>     Twitter
>             edaqa
>
>
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>

-- 
edA-qa mort-ora-y  
	http://mortoray.com/

Creator of the Leaf language
	http://leaflang.org/

Streaming algorithms, AI, and design on Twitch
	https://www.twitch.tv/mortoray

Twitter
	edaqa
	

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