Re: [BUG] Parser error for "pointer to a function pointer"

[Abhijit Halder <abhijit.k.halder@gmail.com>]

On Sun, Sep 4, 2011 at 4:13 PM, Abhijit Halder
<abhijit.k.halder@gmail.com> wrote:
> On Sun, Sep 4, 2011 at 4:07 PM, Abhijit Halder
> <abhijit.k.halder@gmail.com> wrote:
>> On Sun, Sep 4, 2011 at 2:08 PM, Abhijit Halder
>> <abhijit.k.halder@gmail.com> wrote:
>>> Hello everybody,
>>>
>>> While working with gdb I have encountered the following problem.
>>>
>>> GNU gdb (GDB) 7.3.50.20110814-cvs
>>> Copyright (C) 2011 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>>> This is free software: you are free to change and redistribute it.
>>> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>>> and "show warranty" for details.
>>> This GDB was configured as "i686-pc-linux-gnu".
>>> For bug reporting instructions, please see:
>>> <http://www.gnu.org/software/gdb/bugs/>.
>>> (gdb) ptype int(**)(void)
>>> A syntax error in expression, near `*)(void)'.
>>>
>>>
>>> I have made the following changes to fix this issue.
>>>
>>>
>>> --- src/gdb/c-exp.y     2011-05-06 19:42:17.000000000 +0530
>>> +++ dst/gdb/c-exp.y     2011-09-04 13:57:16.082207664 +0530
>>> @@ -19,7 +19,7 @@
>>>    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
>>>
>>>  /* Parse a C expression from text in a string,
>>> -   and return the result as a  struct expression  pointer.
>>> +   and return the result as a  struct expression pointer.
>>>    That structure contains arithmetic operations in reverse polish,
>>>    with constants represented by operations that are followed by special data.
>>>    See expression.h for the details of the format.
>>> @@ -926,12 +926,12 @@ const_or_volatile_or_space_identifier:
>>>
>>>  abs_decl:      '*'
>>>                        { push_type (tp_pointer); $$ = 0; }
>>> -       |       '*' abs_decl
>>> -                       { push_type (tp_pointer); $$ = $2; }
>>> +       |       abs_decl '*'
>>> +                       { push_type (tp_pointer); $$ = $1; }
>>>        |       '&'
>>>                        { push_type (tp_reference); $$ = 0; }
>>> -       |       '&' abs_decl
>>> -                       { push_type (tp_reference); $$ = $2; }
>>> +       |       abs_decl '&'
>>> +                       { push_type (tp_reference); $$ = $1; }
>>>        |       direct_abs_decl
>>>        ;
>>>
>>> Thanks,
>>> Abhijit Halder
>>>
>>
>> A regression happens with the above fix.
>> The above fix is not working for the following:
>> (gdb)ptype int (*(*(*)(char))(short int))(long int
>                          ^^^
Oopps!!! Sorry for the typo again.
The regression happened for (gdb)ptype int (*(*(*)(char))(short int))(long int)
But once again the following still throws error (gdb)ptype int
(*(**(*)(char))(short int))(long int)
>>
>> The following is working fine.
>>
>> --- src/gdb/c-exp.y     2011-05-06 19:42:17.000000000 +0530
>> +++ dst/gdb/c-exp.y     2011-09-04 15:57:51.212167205 +0530
>> @@ -926,6 +926,8 @@ const_or_volatile_or_space_identifier:
>>
>>  abs_decl:      '*'
>>                        { push_type (tp_pointer); $$ = 0; }
>> +       |       abs_decl '*'
>> +                       { push_type (tp_pointer); $$ = $1; }
>>        |       '*' abs_decl
>>                        { push_type (tp_pointer); $$ = $2; }
>>        |       '&'
>>
>>
>>
>> Thanks,
>> Abhijit Halder
>>
>