[cfe-dev] printing name of owning anonymous structure in RecursiveASTVisitor::VisitFieldDecl?

[Richard Smith]

On Tue, Dec 11, 2012 at 11:04 AM, Yang Chen <chenyang at cs.utah.edu> wrote:
> On 12/11/12 9:17 AM, Peeter Joot wrote:
>>
>> With an AST field visitor of the following form:
>>
>>    bool VisitFieldDecl( FieldDecl * f )
>>    {
>>       RecordDecl * r = f->getParent() ;
>>
>>       TypeSourceInfo * t = f->getTypeSourceInfo() ;
>>
>>       TypeLoc TL = t->getTypeLoc() ;
>>
>>       if ( const ArrayTypeLoc *Arr = dyn_cast<ArrayTypeLoc>(&TL) )
>>       {
>>          TL = Arr->getElementLoc() ;
>>       }
>>
>>       const QualType & q = TL.getType() ;
>>
>>       cout
>> << r->getName().str()
>> << " : " << q.getAsString() << endl ;
>>
>>       return true ;
>>    }
>>
>> I get a printout of
>>
>> <classname> : type-dependence.  Example:
>>
>> struct Test
>> {
>>    int a, b ;
>> } ;
>>
>> gives:
>>
>> Test : int
>> Test : int
>>
>> For anonymous structs like:
>>
>> struct TestA
>> {
>>    struct {
>>       int a, b ;
>>    } m ;
>> } ;
>>
>> I do get a "name" for the dependent type m:
>>
>> TestA : struct <anonymous struct at asample2.cpp:8:4>
>>
>> However, when the AST visitor is called for the a, b fields in this
>> anonymous struct, my r->getName().str() call returns an empty string.
>>
>> I'm guessing I could get the "name" above, if I could get the QualType
>> from the 'RecordDecl * r' variable, but am unsure how to do so, because
>> getTypeSourceInfo() doesn't appear to be available to a RecordDecl object.
>> How can I get the RecordDecl's QualType?
>
>
> You can try this:
> const Type *RT = r->getTypeForDecl();
> QualType QT = RT->getCanonicalTypeInternal();

That's not the right way. getTypeForDecl is a cache, and
getCanonicalTypeInternal is internal. Use ASTContext::getRecordType.