llvm dev - Feb 2015 - [LLVMdev] DataLayout missing in isDereferenceablePointer()

Hi,

I've been debugging this issue for many hours, and would like a sanity
check. The issue is that DL (DataLayout) is nullptr inside
isDereferenceablePointer() no matter what I try. Why is DataLayout
ever nullptr (shouldn't it get defaults?), and what should I do to
make it non-nullptr?

Thanks.

Ram

Have you tried passing a non-null DataLayout into isDereferenceablePointer?

How are you trying to call it? Do you have a DataLayout?

-eric



On Sun Feb 08 2015 at 7:44:36 PM Ramkumar Ramachandra <artagnon at
gmail.com>
wrote:
> Hi,
>
> I've been debugging this issue for many hours, and would like a sanity
> check. The issue is that DL (DataLayout) is nullptr inside
> isDereferenceablePointer() no matter what I try. Why is DataLayout
> ever nullptr (shouldn't it get defaults?), and what should I do to
> make it non-nullptr?
>
> Thanks.
>
> Ram
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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Eric Christopher wrote:
> How are you trying to call it? Do you have a DataLayout?
In test/Analysis/ValueTracking/memory-dereferenceable.ll, just change
byval to dereferenceable(8), and %dparam won't match (see
lib/IR/Value.cpp:521 for the logic that is supposed to fire). How do I
get it to pass? I tried introducing a target-triple and
target-datalayout, but it didn't help.