llvm dev - Sep 2019 - Dwarf - 5 features in clang and llvm

> On Sep 10, 2019, at 6:15 AM, Djordje Todorovic via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> Hi Sourabh,
> 
> Support for call-site related DWARF 5 tag/attributes is implemented very
late, in the LLVM middle-end.
> Please note that there is also the IR-level flag (DIFlagAllCallsDescribed)
that lowers to
> the DW_AT_call_all_calls.
> 
> There is also support for call-site-parameter (DW_TAG_call_site_parameter)
and the debug entry values
> (DW_OP_entry_value) related DWARF 5 symbols, but it is restricted by the
CC1 option ‘-femit-debug-entry-values’,
> since the LLDB is still missing support for that.
Not for too long ;)

See https://reviews.llvm.org/D67410 <https://reviews.llvm.org/D67410>
& https://reviews.llvm.org/D67376 <https://reviews.llvm.org/D67376>

best,
vedant
> 
> Best regards,
> Djordje
> 
> On 10.9.19. 13:58, Sourabh Singh Tomar via llvm-dev wrote:
>> Hello All,
>> 
>> I was working on some dwarf-5 features and debugging optimized code
support in clang and llvm.
>> 
>> Noticed that, DW_TAG_call_site is supported in llvm middle-end. but
clang is not emitting these.
>> 
>> I was hoping, if someone could provide current status of these features
and current status of dwarf-5 features in clang and llvm.
>> That will be immensely helpful.
>> 
>> Thanks!
>> Sourabh.
>> 
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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Great to see this! :)

Best,
Djordje

On 10.9.19. 21:16, Vedant Kumar wrote:
> 
> 
>> On Sep 10, 2019, at 6:15 AM, Djordje Todorovic via llvm-dev
<llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>
wrote:
>>
>> Hi Sourabh,
>>
>> Support for call-site related DWARF 5 tag/attributes is implemented
very late, in the LLVM middle-end.
>> Please note that there is also the IR-level flag
(DIFlagAllCallsDescribed) that lowers to
>> the DW_AT_call_all_calls.
>>
>> There is also support for call-site-parameter
(DW_TAG_call_site_parameter) and the debug entry values
>> (DW_OP_entry_value) related DWARF 5 symbols, but it is restricted by
the CC1 option ‘-femit-debug-entry-values’,
>> since the LLDB is still missing support for that.
> 
> Not for too long ;)
> 
> See https://reviews.llvm.org/D67410 & https://reviews.llvm.org/D67376
> 
> best,
> vedant
> 
>>
>> Best regards,
>> Djordje
>>
>> On 10.9.19. 13:58, Sourabh Singh Tomar via llvm-dev wrote:
>>> Hello All,
>>>
>>> I was working on some dwarf-5 features and debugging optimized code
support in clang and llvm. 
>>>
>>> Noticed that, DW_TAG_call_site is supported in llvm middle-end. but
clang is not emitting these. 
>>>
>>> I was hoping, if someone could provide current status of these
features and current status of dwarf-5 features in clang and llvm. 
>>> That will be immensely helpful.
>>>
>>> Thanks!
>>> Sourabh.
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org <mailto:llvm-dev at
lists.llvm.org>
>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

Hello Djordje, Vedant,

Thanks a lot for sharing information.

I have a doubt, please consider the following simple test case-
#include <iostream>
int func(int* ptr){
        std::cout << *ptr;
        return *ptr + 5;
}
int main(int argc, char** argv){
        int a = 4;
        int* ptr_a = &a;
        int b = func(ptr_a);
        return 0;
}
commandline used --
bash$ clang++ -Xclang -femit-debug-entry-values -O2 -ggdb test.cpp

For this case-- these Tags are not emitted
DW_TAG_call_site, DW_TAG_call_site_paramter ..
only DW_AT_GNU_all_call_sites attribute is present.

+ @Djorde DW_TAG_call_site are supported using late MIR approach, are the
new Call Site related development will be supported via MIR. or their will
be a frontend level debug metadata support will be added.

Thanks!
Sourabh.



On Wed, Sep 11, 2019 at 12:02 PM Djordje Todorovic <
djordje.todorovic at rt-rk.com> wrote:
> Great to see this! :)
>
> Best,
> Djordje
>
> On 10.9.19. 21:16, Vedant Kumar wrote:
> >
> >
> >> On Sep 10, 2019, at 6:15 AM, Djordje Todorovic via llvm-dev <
> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>
wrote:
> >>
> >> Hi Sourabh,
> >>
> >> Support for call-site related DWARF 5 tag/attributes is
implemented
> very late, in the LLVM middle-end.
> >> Please note that there is also the IR-level flag
> (DIFlagAllCallsDescribed) that lowers to
> >> the DW_AT_call_all_calls.
> >>
> >> There is also support for call-site-parameter
> (DW_TAG_call_site_parameter) and the debug entry values
> >> (DW_OP_entry_value) related DWARF 5 symbols, but it is restricted
by
> the CC1 option ‘-femit-debug-entry-values’,
> >> since the LLDB is still missing support for that.
> >
> > Not for too long ;)
> >
> > See https://reviews.llvm.org/D67410 &
https://reviews.llvm.org/D67376
> >
> > best,
> > vedant
> >
> >>
> >> Best regards,
> >> Djordje
> >>
> >> On 10.9.19. 13:58, Sourabh Singh Tomar via llvm-dev wrote:
> >>> Hello All,
> >>>
> >>> I was working on some dwarf-5 features and debugging optimized
code
> support in clang and llvm.
> >>>
> >>> Noticed that, DW_TAG_call_site is supported in llvm
middle-end. but
> clang is not emitting these.
> >>>
> >>> I was hoping, if someone could provide current status of these
> features and current status of dwarf-5 features in clang and llvm.
> >>> That will be immensely helpful.
> >>>
> >>> Thanks!
> >>> Sourabh.
> >>>
> >>> _______________________________________________
> >>> LLVM Developers mailing list
> >>> llvm-dev at lists.llvm.org <mailto:llvm-dev at
lists.llvm.org>
> >>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >>>
> >> _______________________________________________
> >> LLVM Developers mailing list
> >> llvm-dev at lists.llvm.org <mailto:llvm-dev at
lists.llvm.org>
> >> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> >
>
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