[cfe-dev] Type Information for C++ classes

[Mohammad Adil]

I am comfortable with clang's internal API at the time, although the
abstraction provided in libclang seems much easier to work with. The
clang's internal API is much more self-explanatory than libclang. Can you
please give me some hints as for how to find the members and methods of a
class. I can visit all classes using VisitCXXRecordDecl but there doesn't
seem to be any way to find it's members. Is there a way to recursively walk
all the children this CXXRecordDecl and figure out which ones are methods
and members? Also, I am struggling on how to use the ASTMatcher you
mentioned earlier. I have a returnstmt using the VisitStmt method of my
visitor. This will give me a return statement. How do I find which function
it belongs to? Can you give a small example of how to do it? I am very
grateful for your help.

On Fri, Oct 12, 2012 at 1:13 PM, Manuel Klimek <klimek at google.com> wrote:

> On Fri, Oct 12, 2012 at 7:38 AM, Mohammad Adil <madil90 at gmail.com> wrote:
>
>> Also, Is it better to use libclang for doing this. My complete purpose is
>> to refactor source code to find all functions, their arguments, return
>> statements, all class members and methods. Can I find all this using
>> libclang? I've heard that clang is unstable while libclang is stable. Which
>> one should I use? I am currently using clang's internal API.
>
>
>  http://clang.llvm.org/docs/Tooling.html
>
> I don't have too much experience with using libclang for something like
> this; what you want to do is definitely possible with LibTooling. And while
> the internal clang AST interface is going to change more often than
> libclang, in practice it is stable enough that you usually don't care
> unless you want to ship a product (like an IDE) to end users. I'd try to
> decide more on how much power you need, or what language you'd like to
> write your integration in.
>
> One good way is to try to start with libclang, and if you see that you're
> hitting a missing feature, switch to using libtooling.
>
> Cheers,
> /Manuel
>
>
>> On Fri, Oct 12, 2012 at 10:16 AM, Mohammad Adil <madil90 at gmail.com>wrote:
>>
>>> My purpose is to overload the << operator for all classes if they don't
>>> already have one. The basic goal is to make all classes serializable over
>>> some stream (ideally a network stream). Is that possible with clang? If
>>> yes, How do I find all the member variables and functions of a class or
>>> struct?
>>>
>>> On Thu, Oct 11, 2012 at 5:13 PM, Manuel Klimek <klimek at google.com>wrote:
>>>
>>>> +cfe-dev
>>>>
>>>> On Thu, Oct 11, 2012 at 12:13 PM, Mohammad Adil <madil90 at gmail.com>wrote:
>>>>
>>>>> Sorry about that. I wasn't correctly changing my language from C to
>>>>> C++. I figured that out. It's working now. I wanted to ask you one more
>>>>> thing. I am trying to find all the return statements in the file. I can do
>>>>> that easily but I know want to find out which function does this return
>>>>> statement belong to? Since funcdecl and return statements are de-coupled, I
>>>>> can't find a way to do so. Is there an easy way to do it?
>>>>
>>>>
>>>> If you're using RecursiveASTVisitor, you can intercept the Traverse*
>>>> calls to figure out AST child relations. Or you can use the AST matchers
>>>> (functionDecl(hasDescendant(returnStmt()))).
>>>>
>>>> Cheers,
>>>> /Manuel
>>>>
>>>>
>>>>>  On Wed, Oct 10, 2012 at 8:29 PM, Manuel Klimek <klimek at google.com>wrote:
>>>>>
>>>>>> On Wed, Oct 10, 2012 at 2:05 AM, madil90 <madil90 at gmail.com> wrote:
>>>>>> > Hi,
>>>>>> >    I am trying to find the type of a VarDecl. I am currently using
>>>>>> the
>>>>>> > VarDecl->getOriginalType(). This function does not work for C++
>>>>>> classes.
>>>>>> > Consider the code below:
>>>>>>
>>>>>> Does getType() not work for you for some reason?
>>>>>>
>>>>>> Cheers,
>>>>>> /Manuel
>>>>>>
>>>>>> >
>>>>>> > class Foo
>>>>>> > {
>>>>>> >     int a;
>>>>>> > };
>>>>>> >
>>>>>> > int f( Foo foo);
>>>>>> >
>>>>>> > When I try to find the type for "foo" in the function decleration,
>>>>>> it
>>>>>> > returns "int", while the actual type is Foo. If Foo is a structure,
>>>>>> this
>>>>>> > works perfectly fine but not for C++ classes. Can some one please
>>>>>> explain
>>>>>> > where the type information for C++ classes is stored?
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > --
>>>>>> > View this message in context:
>>>>>> http://clang-developers.42468.n3.nabble.com/Type-Information-for-C-classes-tp4027266.html
>>>>>> > Sent from the Clang Developers mailing list archive at Nabble.com.
>>>>>> > _______________________________________________
>>>>>> > cfe-dev mailing list
>>>>>> > cfe-dev at cs.uiuc.edu
>>>>>> > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Mohammad Adil
>>>>> LUMS SSE
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> Mohammad Adil
>>> LUMS SSE
>>>
>>>
>>
>>
>> --
>> Mohammad Adil
>> LUMS SSE
>>
>>
>


-- 
Mohammad Adil
LUMS SSE
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