[cfe-dev] Fetching typedef details via libclang

[Douglas Gregor]

On Apr 11, 2011, at 11:18 PM, Abramo Bagnara wrote:

> Il 12/04/2011 02:15, Douglas Gregor ha scritto:
>> 
>> On Mar 28, 2011, at 1:55 PM, Stefan Seefeld wrote:
>> 
>>> I'm looking for a way to query the libclang AST whether a typedef's 
>>> referree type was constructed in-place, such as in
>>> 
>>>  typedef struct { ... } CXString;
>>> 
>>> 
>>> Such constructs are rather common in C APIs, and I'd like to fold the 
>>> two types (the anonymous struct with the 'CXString' alias) into one, to 
>>> reduce the noise in the generated API documentation.
>>> 
>>> Is this possible, using libclang ?
>> 
>> Not currently.
>> 
>>> If not, any ideas how best to 
>>> implement that ?
>> 
>> 
>> It's a little tricky, because Clang's AST doesn't really hold on to this information well. In this specific case, where the tag is anonymous, you can query TagDecl::getTypedefForAnonDecl() to see if it's a typedef of an anonymous declaration. But in a similar case like
>> 
>>  typedef struct CXString { ... } CXString;
>> 
>> the AST doesn't have the information you seek. Perhaps this information could be added into ElaboratedType or ElaboratedTypeLoc.
> 
> You always forget isEmbeddedInDeclarator ;-)

You're right, I did completely forget about this!

So, this information is *obviously* available in the AST ;), but hasn't been exposed in libclang.

	- Doug