[cfe-dev] Cleaning up the representation of Decls in the AST

Neil Booth neil at daikokuya.co.uk
Sat Aug 23 17:57:57 PDT 2008

Ted Kremenek wrote:-

> On Aug 23, 2008, at 5:29 PM, Neil Booth wrote:
>> Ted Kremenek wrote:-
>>> - RecordDecls would represent their fields as a group of DeclGroups.
>>>  This enables us to accurately represent:
>>> struct x {
>>>   struct y { int z; } a, b;
>>>   int c;
>>> };
>>> A field_iterator interface can provide the necessary abstraction to
>>> clients that just want to iterate over the FieldDecls of a struct.
>> This example has a different meaning in C and C++.  Would they
>> be represented the same?
> Hi Neil,
> I think I know what you are referring to, but could you please elaborate 
> a little more?  Are you referring to the visibility of fields?

Sorry I should have been clearer.  I'm not referring to visibility,
I'm referring to the fact that in C "struct y" is at file scope,
whereas in C++ it's a nested struct.

>>  How would one walk file-scope struct/
>> union/enum declarations for C?
> We can currently iterate over all file-scope declarations using  
> TranslationUnit (which contains references to all top-level  
> declarations).  This same interface could be preserved by (a) providing a 
> new iterator mechanism to iterate over top-level DeclGroups and (b) 
> layering a revised iterator mechanism for iterating over the top-level 
> Decls over the iterating mechanism for top-level DeclGroups.

Hence my follow-up question - it seems your iterator would miss
"struct y" in a C source file?


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