MI: -var-create does not resolve typedefs

["Martin Richtarsky" <s at martinien dot de>]

Hi,

the result of the -var-create command is documented here [1] as follows:

?type?

    The varobj?s type. This is a string representation of the type, as
would be printed by the GDB CLI.

However, for a typedef this does not seem to hold:

$ cat mi.cpp
#include <string>
#include <vector>

typedef std::vector<std::string> StringVec;
typedef int MyInt;

int main()
{
    size_t a = 0;
    StringVec sv;
    MyInt i;
    return 0;
}

$ g++ -g2 mi.cpp
$ gdb --interpreter=mi a.out
...
1-var-create - * "a"
1^done,name="var1",numchild="0",value="4195792",type="size_t",thread-id="1",has_more="0"
(gdb)
2-var-create - * "sv"
2^done,name="var2",numchild="1",value="{...}",type="StringVec",thread-id="1",has_more="0"
(gdb)
ptype(a)
&"ptype(a)\n"
~"type = unsigned long\n"
^done
(gdb)
ptype(sv)
&"ptype(sv)\n"
~"type = class std::vector<std::basic_string<char, std::char_traits<char>,
std::allocator<char> >, std::allocator<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > > [with _Tp =
std::basic_string<char, std::char_traits<char>, std::allocator<char> >,
_Alloc = std::allocator<std::basic_string<char, std::char_traits<char>,
std::allocator<char> > >] : protected std::_Vector_base<_Tp, _Alloc> {\n"
~"  public:\n"


Note how ptype resolves the typedef, but -var-create just shows the alias.

The issue can be solved by a simple patch:

--- a/gdb/varobj-orig.c
+++ b/gdb/varobj.c
@@ -905,7 +905,7 @@ varobj_get_type (struct varobj *var)
   if (CPLUS_FAKE_CHILD (var) || !var->root->is_valid)
     return std::string ();

-  return type_to_string (var->type);
+  return type_to_string (check_typedef(var->type));
 }

 /* Obtain the type of an object variable.  */


This would also solve the issue I'm having when using MI with a split
dwarf build and a gold index [2]

Is this a bug or is the typedef intentionally not resolved?

[1]
https://sourceware.org/gdb/onlinedocs/gdb/GDB_002fMI-Variable-Objects.html
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=23042

Best regards,
Martin

-- 
http://www.productive-cpp.com/