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

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.
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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.

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
>

> 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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