[LLVMdev] Migration from JIT to MCJIT

[Weiss, Eran]

Thank you for the help.

The relocation type value is anded with 0xffffffffL. (RuntimeDyldMachO.cpp:214)
Maybe this mask should be different?
Anyway, it seems like this relocation isn't implemented. (RuntimeDyldMachO.cpp:104)

From: Jiong Wang <jiwang at tilera.com<mailto:jiwang at tilera.com>>
Date: Tue, 9 Apr 2013 09:42:03 -0400
To: Eran Weiss <eran.weiss at emc.com<mailto:eran.weiss at emc.com>>
Cc: "llvmdev at cs.uiuc.edu<mailto:llvmdev at cs.uiuc.edu>" <llvmdev at cs.uiuc.edu<mailto:llvmdev at cs.uiuc.edu>>
Subject: Re: [LLVMdev] Migration from JIT to MCJIT

于 2013/4/9 21:08, Weiss, Eran 写道:
Hi,

I'm migrating my code (running on mac) from using JIT to MCJIT. My code generates in memory, mostly using the llvm-c api, and then runs the generated code.
When I try to use MCJIT I encounter a problem with relocations of external symbols – functions compiled statically beforehand with gcc.

I get the following error:

Invalid relocation type!
UNREACHABLE executed at /Users/weisse4/dev/llvm/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp:89

While debugging, I see that the relocation type read in  is 218103811, which seems corrupt to me.

Hi Weiss,

    I do not have any experience on Mach binary format, but the hex value of 218103811 is 0xd000003  (maybe the relocation type is RIT_Generic_PreboundLazyPointer = 3),  something looks like a relocation entry composed of "symbol index" + "relocation type".
    maybe something is wrong, that the relocation entry is not anded with a mask to get the final relocation type.

---
Regards,
Jiong

Did someone encounter a similar error? Or can direct me to changes that I need to do while migrating from JIT to MCJIT?

Thanks.



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