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Re: C++/Java regressions
On Tue, Nov 25, 2003 at 11:04:41PM -0500, Ian Lance Taylor wrote:
> Then when gdb goes to look up T5<int>, it finds the DWARF psymbol for
> the class itself, but it also finds that the symbol might be a
> namespace. It then decides that it is a namespace.
That sounds like the bit that's wrong. If it found a psymbol for the
class why does it decide to call it a namespace?
> The problem with t5i, besides some demangler changes which have
> already been addressed, is that gdb doesn't recognize that a
> constructor function is, in fact, a constructor. That's because the
> code in c-typeprint.c does this:
>
> char *method_name = TYPE_FN_FIELDLIST_NAME (type, i);
> char *name = type_name_no_tag (type);
> int is_constructor = name && strcmp (method_name, name) == 0;
>
> and this:
>
> char *physname = TYPE_FN_FIELD_PHYSNAME (f, j);
> int is_full_physname_constructor =
> is_constructor_name (physname)
> || is_destructor_name (physname)
> || method_name[0] == '~';
>
> The first fails because name is "T5<int>" and method_name is "T5".
> The second fails because this is dealing with debugging information,
> and gcc does not emit any physical symbol name information for class
> constructors.
>
> This could be addressed by changing the simple test for is_constructor
> to a more complex test which ignore the template arguments when
> determining whether method_name was the same as name.
Yes, I have a patch sitting here (for some time) which does this. It
got mixed in with some other patches that aren't ready for prime-time
yet.
I'm considering a routine for canonicalization of C++ demangled names.
That's the only way we're going to get templates.exp to start working
robustly. For cv-qualifiers it's fairly easy, and most of what gets
mangled is to accomodate either space efficiency or linker character
sets so that's not all so important. "Unsigned" <-> "unsigned int" is
also easy. Template arguments can be a little harder so we may punt.
Perhaps next month.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer