[llvm-dev] how to add the location debug info for each instruction

[Hui Zhang via llvm-dev]

Hello,

I found a weird thing in llvm 3.3:

For exactly the same MDNode  *space,  if I cast it to DILocation
 loc(space) and call loc.getFileName(),   or I cast it to DIScope
sco(space) and call sco.getFilename(),   the return value would be
different ! Totally two different files

I don't know if it's a bug or why it is happening like this, and what's the
conceptual difference between these two classes: DIScope and DILocation ?

Thanks !

On Tue, Nov 3, 2015 at 12:43 PM, Hui Zhang <wayne.huizhang at gmail.com> wrote:

> ​Thank you !
>
> Yes, it's very nice ​
>
> On Tue, Nov 3, 2015 at 12:21 PM, Adrian Prantl <aprantl at apple.com> wrote:
>
>>
>> On Nov 3, 2015, at 8:26 AM, Hui Zhang via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> Hello,
>>
>> For some reason,  I have to stick on llvm 3.3 for a language compiler, I
>> find that the location debug info is attached to each instruction using
>> !dbg, however, I found some of that information is mis-attched and need to
>> be changed, so I want to *know what functions(I checked all funcs in
>> DIBuilder.h but didn't find a appropriate one) are used to attach those
>> !dbg nodes to each instruction ?* It would be even better if you can
>> points to the places that clang uses to create those nodes.
>>
>>
>> Have a look at IRBuilder instead:
>>
>> void SetCurrentDebugLocation
>> <http://llvm.org/doxygen/classllvm_1_1IRBuilderBase.html#a63fc74646456a3bed261512f21efe29c>
>>  (DebugLoc <http://llvm.org/doxygen/classllvm_1_1DebugLoc.html> L) Set
>> location information used by debugging information.
>> <http://llvm.org/doxygen/classllvm_1_1IRBuilderBase.html#a63fc74646456a3bed261512f21efe29c>
>> const
>> <http://llvm.org/doxygen/AArch64PromoteConstant_8cpp.html#a90f8350fecae261c25be85d38b451bff>
>>  DebugLoc <http://llvm.org/doxygen/classllvm_1_1DebugLoc.html> &
>> getCurrentDebugLocation
>> <http://llvm.org/doxygen/classllvm_1_1IRBuilderBase.html#a2514366416ab188b68243c19a765603e>
>>  () const
>> <http://llvm.org/doxygen/AArch64PromoteConstant_8cpp.html#a90f8350fecae261c25be85d38b451bff>
>>  Get location information used by debugging information.
>>
>> -- adrian
>>
>> PS: Isn’t it nice how we consistently name accessor functions?
>>
>>
>
>
> --
> Best regards
>
>
> Hui Zhang
>



-- 
Best regards


Hui Zhang
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