[llvm-dev] Reuse llvm::ExecutionEngine

[preejackie via llvm-dev]

Hi Bjoern,

Could you please give me a minimal code sample to produce this behavior?

On 07/05/19 5:17 PM, Gaier, Bjoern via llvm-dev wrote:
>
> Dear LLVM-Mailing-List,
>
> I’m using the llvm::EngineBuilder to create an instance of the 
> llvm::ExecutionEngine, I then JIT my code, take the addresses I need 
> and delete the llvm::ExecutionEngine. But now I started to wonder, if 
> I could reuse that instance for a new module again?
>
> I first tried calling llvm::EngineBuilder without setting a Module, I 
> planned to add it later – but when I do this the “create” function 
> will crash.
>
What crash you get? By quickly looking through interface, EngineBuilder 
uses nullptr if no module are provided.
>
> Another test I ran was calling “removeModule” of the 
> llvm::ExecutionEngine  after the call to finalizeObject. Then I added 
> the same module again and ran finalizeObject again. The result was 
> weird, I suddenly became error messages about the relocation – I take 
> this came because I applied a memory mapping in the first run.
>
> So to make it short: Is the llvm::ExecutionEngine designed for a reuse 
> or is it better to create a new instance again?
>
> Kind greetings
>
> Björn
>
> Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, 
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-- 
Have a great day!
PreeJackie

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