[Bug debug/16063] Debuggers need more information about enum types in C++

[Bug debug/16063] Debuggers need more information about enum types in C++

[tromey at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063

Tom Tromey <tromey at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at gcc dot gnu.org

--- Comment #5 from Tom Tromey <tromey at gcc dot gnu.org> 2012-06-29 13:50:49 UTC ---
DWARF 4 allows this:

The enumeration type entry may have a DW_AT_type attribute which refers to the
underlying
data type used to implement the enumeration.

I think this is definitely needed for "enum class", where the base
type can be specified by the user.
However, emitting it unconditionally wouldn't hurt.

[Bug debug/16063] Debuggers need more information about enum types in C++

[mark at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063

--- Comment #6 from Mark Wielaard <mark at gcc dot gnu.org> ---
Posted a patch:
http://gcc.gnu.org/ml/gcc-patches/2014-03/msg01198.html

[Bug debug/16063] Debuggers need more information about enum types in C++

[tromey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063

Tom Tromey <tromey at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |chihin.ko at oracle dot com

--- Comment #8 from Tom Tromey <tromey at gcc dot gnu.org> ---
*** Bug 54774 has been marked as a duplicate of this bug. ***

[Bug debug/16063] Debuggers need more information about enum types in C++

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
So, is this fixed?

[Bug debug/16063] New: Debuggers need more information about enum types in C++

[jcownie at etnus dot com]

The debug information emitted for enumerated types does not allow a debugger
to unambiguously determine the "underlying type" of the enumeration.

A debugger therefore does not have enough information to allow it to perform
overload resolution when asked to evaluate a function call with an enum type
as an actual argument.

One can view this either as a bug (the compiler is emitting an unsigned value
using DW_FORM_sdata), or as requiring an enhancement.

I believe the simplest solution would be to have the compiler be explicit about 
the representation of the enum type by emitting a DW_AT_encoding with the
DW_TAG_enumeration, so that the debugger is explicitly told whether the 
underlying type of the enumeration is signed or unsigned.

See the (about to be attached) test case for detailed information.

-- 
           Summary: Debuggers need more information about enum types in C++
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jcownie at etnus dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063

[Bug debug/16063] Debuggers need more information about enum types in C++

[jcownie at etnus dot com]

------- Additional Comments From jcownie at etnus dot com  2004-06-18 16:14 -------
Created an attachment (id=6565)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=6565&action=view)
Test case with embedded description.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063

[Bug debug/16063] Debuggers need more information about enum types in C++

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-06-18 16:22 -------
Confirmed, I should note that ICC 6.0 does not do this also.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
      Known to work|                            |3.5.0
   Last reconfirmed|0000-00-00 00:00:00         |2004-06-18 16:22:52
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063

[Bug debug/16063] Debuggers need more information about enum types in C++

[jcownie at etnus dot com]

------- Additional Comments From jcownie at etnus dot com  2004-06-18 16:31 -------
Subject: Re:  Debuggers need more information about enum types in C++ 


> Confirmed, I should note that ICC 6.0 does not do this also.

Right, it's an extension to the DWARF standard to require this. 

I have submitted changes to add this to DWARF to the DWARF2 maliing
lists, but have yet to receive feedback.

I have also submitted it as a bug report to Intel against their latest
compiler ;-)

I imagine their fix may take longer than yours if you're happy with
the (one line of code) patch which I just submitted.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16063