[LLVMdev] How to cache MCJIT compiled object into memory?

[Cheng Zhu]

Thank you Lang. That should work. I was planing to use llvm::StringRef as
the value of the CacheObjs map, and use function name string as key
earlier. I guess that should work too and less storage use right?

On Thu, Sep 18, 2014 at 10:43 AM, Lang Hames <lhames at gmail.com> wrote:

> Hi Cheng,
>
> You could use a raw_svector_ostream to write to a memory buffer, but
> that's unnecessarily complicated. You just need to clone the memory buffer
> pointed to by Obj. Something along the lines of:
>
> class MyCache : public ObjectCache {
> public:
>   void notifyObjectCompiled(const Module *M, MemoryBufferRef Obj) override
> {
>     CachedObjs[M] =
>       MemoryBuffer::getMemBufferCopy(Obj.getBuffer(),
>                                      Obj.getBufferIdentifier());
>   }
>
>   std::unique_ptr<MemoryBuffer> getObject(const Module *M) override {
>     MemoryBuffer& B = *CachedObjs[M];
>     return MemoryBuffer::getMemBufferCopy(B.getBuffer(),
> B.getBufferIdentifier());
>   }
>
> private:
>   std::map<Module*, std::unique_ptr<MemoryBuffer>> CachedObjs;
> };
>
>
> Cheers,
> Lang.
>
>
> On Wed, Sep 17, 2014 at 6:18 PM, Cheng Zhu <chengzhu at gmail.com> wrote:
>
>> Hi, All
>>
>> I m not sure if this question has been asked or not. I'd like cache the
>> MCJIT compiled object into memory buffer so it can be reused later. I
>> followed the Andy Kaylor's example wrote an inherited class from
>> ObjectCache and use raw_fd_ostream to save the cache and load the cache
>> from a file. I checked raw_ostream and its subclass, maybe I am wrong but I
>> don't see one is fit to save to memory buffer. Any suggestions?
>>
>> Thank you very much
>>
>> --
>> Best regards
>>
>> Cheng
>>
>> _______________________________________________
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>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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>>
>>
>


-- 
Best regards

Cheng
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