[LLVMdev] llvm get annotations

[Alexandru Ionut Diaconescu]

Hi Sebastian,

Thanks for the response.

I already did this :

I cast the entire annotated expression to Value*. Then, in order to avoid
ugly things like getAsString(), I check if V->getValueID() ==
Value::ConstantArrayVal in order to cast it to ConstantArray. Because it
contains only array[0], I cast array0>getOperand(0) to ConstantStruct.
Therefore, from ConstantStruct you can get all the four operands. Now, as a
TODO, is only to get the names of @f, @str from every field.

But right now I have only a small step to do. ConstantStruct->getOperand(0)
gives me   i8* bitcast (i32* @f to i8*)  . Do you know how I can get the
name @f from this? I cannot convert it again to ConstantStruct and follow
the same procedure, it will give me a segfault.

Thank you again. Your advice was very helpful :)


On Fri, Mar 1, 2013 at 9:22 AM, Sebastian Dreßler <dressler at zib.de> wrote:

> Hi,
>
> On 02/28/2013 03:55 PM, Alexandru Ionut Diaconescu wrote:
> > Hi Sebastian,
> >
> > I think I am very close to get the annotation, but I need to parse a
> > Value*, which is of type  {[1 x { i8*, i8*, i8*, i32 }]. In one of those
> > fields is the variable that I'm interested into and the string keeping
> the
> > annotation. But I don't know how to parse .... use_begin() gives me the
> > same Value*....do you know how I can parse inside the element?
> >
>
> This is an Array Type (http://llvm.org/docs/LangRef.html#array-type)
> which contains a struct. I assume, that you could cast to ConstantArray
> which is a Value and then use getOperand(0) and cast its result to
> ConstantStruct, like I've done in the sample code. Then you have the
> struct and you can traverse it further.
>
>
> Cheers,
> Sebastian
>
> > Thank you :) !
> >
> >
> >
> >
> >
> > On Wed, Feb 27, 2013 at 4:44 PM, Alexandru Ionut Diaconescu <
> > alexandruionutdiaconescu at gmail.com> wrote:
> >
> >> Hi Sebastian,
> >>
> >> Thank you for the dummy file. I will try to understand and use it. I
> guess
> >> I have some problems with C++11. If I cannot solve by simple "parsing"
> my
> >> code for @llvm.global.annotations, I will ask you again.
> >>
> >> Cheers,
> >> Alex
> >>
> >>
> >> On Wed, Feb 27, 2013 at 4:34 PM, Sebastian Dreßler <dressler at zib.de
> >wrote:
> >>
> >>> Hi Alexandru,
> >>>
> >>> On 02/27/2013 04:20 PM, Alexandru Ionut Diaconescu wrote:
> >>>> [...]
> >>>> Do you have a larger piece of code (maybe you have some dummy/test
> >>>> examples) from your previous work with annotations? It would be very
> >>> useful
> >>>> :D
> >>>>
> >>>
> >>> I've attached an example. But please be aware of:
> >>>
> >>> 1. It uses C++11 and cast (previously I simply replaced cast<> with
> >>> dynamic_cast<> which does not seem to work everywhere, so sorry for
> that).
> >>>
> >>> 2. assert is not used in the style as it should be used, so pleas do
> not
> >>> adopt this style.
> >>>
> >>>
> >>> If some things are still unclear, keep asking ;)
> >>>
> >>> Cheers,
> >>> Sebastian
> >>>
> >>>
> >>> --
> >>> Mit freundlichen Grüßen / Kind regards
> >>>
> >>> Sebastian Dreßler
> >>>
> >>> Zuse Institute Berlin (ZIB)
> >>> Takustraße 7
> >>> D-14195 Berlin-Dahlem
> >>> Germany
> >>>
> >>> dressler at zib.de
> >>> Phone: +49 30 84185-261
> >>>
> >>> http://www.zib.de/
> >>>
> >>
> >>
> >>
> >> --
> >> Best regards,
> >> Alexandru Ionut Diaconescu
> >>
> >
> >
> >
>
>
> --
> Mit freundlichen Grüßen / Kind regards
>
> Sebastian Dreßler
>
> Zuse Institute Berlin (ZIB)
> Takustraße 7
> D-14195 Berlin-Dahlem
> Germany
>
> dressler at zib.de
> Phone: +49 30 84185-261
>
> http://www.zib.de/
>



-- 
Best regards,
Alexandru Ionut Diaconescu
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