Boris Kolpackov <bo...@codesynthesis.com> writes:
> I am trying to figure out how to get a typedef hierarchy from the C/C++
> tree in GCC. Consider the following declarations:
>
> struct s {};
>
> typedef s s_t;
> typedef s_t my_s_t;
>
> my_s_t x;
>
> Giveb 'x' VAR_DECL I can have this traversal using TYPE_MAIN_VARIANT():
>
> x -> my_s_t -> s;
>
> What I am trying to achieve is this:
>
> x -> my_s_t -> s_t -> s
>
> I looked at TYPE_NEXT_VARIANT(), but this is a list while what I need
> is a tree (hierarchy).
But there is no heirarchy in your example. There is only a list.
> Some background on why I need this: I would like to determine if a
> member of a class is size_t so that I can always map it to a 64-bit
> integer in another system (RDBMS). In other words:
>
> struct s
> {
> unsigned int i; // -> 32-bit int
> size_t s; // -> 64-bit int
> }
>
> Even though size_t might be typedef'ed as unsigned int. In the above
> example I can do it. However, adding a level or indirections causes
> problems:
>
> typedef size_t my_size;
>
> struct s
> {
> my_size s; // TYPE_MAIN_VARIANT(my_size) == unsigned int
> }
>
> Any ideas will be much appreciated.
As far as I know this is not possible. A typedef name is just an alias
for the underlying type. When you typedef T as TNAME, where T is itself
a typedef, GCC records that TNAME is a name for the underlying type of
T. It does not record an equivalence of T and TNAME. The C/C++
language do not require GCC to keep track of this information, and it's
simpler for the frontend to just maintain a list.
Ian
