[PATCH] Make dtor of mapped_index_base virtual

Павел Крюков kryukov@frtk.ru
Sun Dec 31 10:12:00 GMT 2017


Hi Simon

> Do you get a build error or something?

Yes, I get a build error with Clang:

dwarf2read.c:25409:5: error: destructor called on non-final 'mapped_index'
that
                    has virtual functions but non-virtual destructor
                    [-Werror,-Wdelete-non-virtual-dtor]
                    data->index_table->~mapped_index ();

> Since the goal is that we don't delete through a pointer of this class, does
the destructor need to be virtual (not that it would hurt anything)?

Just to handle the case if someone would delete through a pointer to
"mapped_index_base" class.

Thanks,
--
Pavel

2017-12-31 4:28 GMT+03:00 Simon Marchi <simon.marchi@polymtl.ca>:

> On 2017-12-30 13:21, Павел Крюков wrote:
>
>> gdb/Changelog:
>> 2017-12-30  Pavel I. Kryukov  <kryukov@frtk.ru>
>>
>>        * dwarf2read.c (mapped_index_base): Make dtor virtual
>>
>> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
>> index 8555b55..fc4c1b3 100644
>> --- a/gdb/ChangeLog
>> +++ b/gdb/ChangeLog
>> @@ -1,3 +1,7 @@
>> +2017-12-30  Pavel I. Kryukov  <kryukov@frtk.ru>
>> +
>> +       * dwarf2read.c (mapped_index_base): Make dtor virtual
>> +
>>  2017-12-28  Simon Marchi  <simon.marchi@polymtl.ca>
>>
>>         * target.h (enum target_object) <TARGET_OBJECT_HPUX_UREGS,
>> diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
>> index 484cbce..3ac4380 100644
>> --- a/gdb/dwarf2read.c
>> +++ b/gdb/dwarf2read.c
>> @@ -272,7 +272,7 @@ struct mapped_index_base
>>
>>    /* Prevent deleting/destroying via a base class pointer.  */
>>  protected:
>> -  ~mapped_index_base() = default;
>> +  virtual ~mapped_index_base() = default;
>>  };
>>
>>  /* A description of the mapped index.  The file format is described in
>> --
>> 2.7.4
>>
>
> Hi Pavel,
>
> Can you clarify what you are trying to fix/improve with this patch?  Since
> the goal is that we don't delete through a pointer of this class, does the
> destructor need to be virtual (not that it would hurt anything)?  Do you
> get a build error or something?
>
> Simon
>



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