[cfe-dev] Fetching typedef details via libclang

[Douglas Gregor]

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.

	- Doug