llvm dev - Nov 2012 - [LLVMdev] clang code-completion question

Dear developers,

First of all, thank you for your job on clang, now I use clang as
autocompletion tool with my Vim, and it seems to work awesome. But I have
some questions:

 1) Is it possible to make clang to complete pointers to functions as a
functions? I mean, I want to get function prototype, with returning value
type and all the parameters.

2) Is it possible to make completion work inside structure initializers? I
mean, like that:

typedef struct {
   int a;
   int b;
} T_MyStruct;
int main(void)
{
   T_MyStruct my_struct = {
      .a = 0,
      ./*cursor is here. I want to get list of struct members: [a, b]*/
   };
}

Thanks.

--
Regards,
Dmitry
[image: Встроенное изображение 1]
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[bcc llvm-dev, +cfe-dev]

Dmitry Frank wrote:
> Dear developers,
>
> First of all, thank you for your job on clang, now I use clang as
> autocompletion tool with my Vim, and it seems to work awesome. But I
> have some questions:
>
>   1) Is it possible to make clang to complete pointers to functions as a
> functions? I mean, I want to get function prototype, with returning
> value type and all the parameters.
Clang certainly knows all the relevant information, but it's not clear 
how this would work in code completion. What do you expect to have in 
the buffer, and where would the cursor be for clang to complete?

You'll need to have already typed something that makes it clear that the 
next thing clang ought to do is complete the type of function prototype. 
Usually completion looks forwards, and wouldn't you have already needed 
to type the return type to get to the function name? Maybe I'm just 
failing to visualize what we're doing here.
> 2) Is it possible to make completion work inside structure initializers?
> I mean, like that:
>
> typedef  struct  {
>     int  a;
>     int  b;
> } T_MyStruct;
>
> int  main(void)
> {
>     T_MyStruct my_struct = {
>        .a =0,
>        ./*cursor is here. I want to get list of struct members: [a, b]*/
>     };
> }
This sounds like a great missing-feature bug report. Please file it at 
llvm.org/bugs !

Nick

---------- Forwarded message ----------
From: Dmitry Frank <dimon.frank at gmail.com>
Date: 2012/11/28
Subject: Re: [LLVMdev] clang code-completion question
To: Nick Lewycky <nicholas at mxc.ca>
Cc: "cfe-dev at cs.uiuc.edu Developers" <cfe-dev at cs.uiuc.edu>


Hello, Nick!

Thank you for your reply.

Regarding to pointers to functions: look at this code:

static void _some_func(int a, int b, int c)
{
   //-- do something
}

typedef void (*T_pMyFunc) (int a, int b, int c);

typedef struct {
   T_pMyFunc p_my_func;

} T_MyStruct;

int main(void)
{
   T_MyStruct my_struct = {
      .p_my_func = _some_func,
   };

   _some_func/*cursor is here. I see function signature: int a, int b, int
c. Everything is great*/

   my_struct./*cursor is here. I see only member T_pMyFunc p_my_func, but
there's no function signature. There would be even greater if clang could
handle this*/

}

Hope I explained this clear.

As to second one (completion inside structure initializer), thanks for the
suggestion, I filed it as you suggested:
http://llvm.org/bugs/show_bug.cgi?id=14446 <http://goo.gl/wYP0z>

--
Regards,
Dmitry



2012/11/28 Nick Lewycky <nicholas at mxc.ca>
> [bcc llvm-dev, +cfe-dev]
>
>
> Dmitry Frank wrote:
>
>> Dear developers,
>>
>> First of all, thank you for your job on clang, now I use clang as
>> autocompletion tool with my Vim, and it seems to work awesome. But I
>> have some questions:
>>
>>   1) Is it possible to make clang to complete pointers to functions as
a
>> functions? I mean, I want to get function prototype, with returning
>> value type and all the parameters.
>>
>
> Clang certainly knows all the relevant information, but it's not clear
how
> this would work in code completion. What do you expect to have in the
> buffer, and where would the cursor be for clang to complete?
>
> You'll need to have already typed something that makes it clear that
the
> next thing clang ought to do is complete the type of function prototype.
> Usually completion looks forwards, and wouldn't you have already needed
to
> type the return type to get to the function name? Maybe I'm just
failing to
> visualize what we're doing here.
>
>
>  2) Is it possible to make completion work inside structure initializers?
>> I mean, like that:
>>
>> typedef  struct  {
>>     int  a;
>>     int  b;
>> } T_MyStruct;
>>
>> int  main(void)
>> {
>>     T_MyStruct my_struct = {
>>        .a =0,
>>        ./*cursor is here. I want to get list of struct members: [a,
b]*/
>>     };
>> }
>>
>
> This sounds like a great missing-feature bug report. Please file it at
> llvm.org/bugs !
>
> Nick
>
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