Description Elena Laskavaia 2007-04-04 11:29:56 EDT

Description: 

Variable view of the debugger resets and don't show any vars when
exploring structure of string type variable in C++

How to Reproduce:

#include <string>
using namespace std;
int main(int argc, char *argv[]) {
        string aa("foo");
        return EXIT_SUCCESS; // breakpoint
}


* Run debugger (This is QNX Project)
* Set breakpoint on return
* when hit expore aa varaible
** expand protected
** expand _Bx
** expand public
** expnad _Buf

View would become grey - no vars, error message displayed on console
There is no member or method named _Buf.
Type _Container_base has no component named _Buf.

Mi Protocol looks like:
[1,175,633,138,039] 1011-data-evaluate-expression aa
[1,175,633,138,039] 1011^done,value="{<_String_val<char,std::allocator<char> >>
= {<_String_base> = \
{<_Container_base> = {<No data fields>}, <No data fields>}, _Alval =
{<_Allocator_base<char>> = {<No\
 data fields>}, <No data fields>}}, static npos = 4294967295, _Bx = {_Buf =
\"foo\\0\\001\\0\\0\\0\\\
314z\\004\\b\\377\\377\\377\\377\", _Ptr = 0x6f6f66 <Error reading address
0x6f6f66: error 312>}, _M\
ysize = 3, _Myres = 15}"
[1,175,633,138,039] (gdb) 
[1,175,633,150,498] 1012-var-create - * *(((aa)._Buf)+0)@16
[1,175,633,150,498] &"There is no member or method named _Buf.\n"
[1,175,633,150,498] &"Type _Container_base has no component named _Buf.\n"
[1,175,633,150,498] 1012^error,msg="."
[1,175,633,150,498] (gdb)


CDT 4.0 Still has this problem.

I run same app as Local C++ App on Windows. Variable view does not
crash but still shows wrong values:
When exploring var and clicking on _M_p var it shows shole structure
not single _M_p value, When clicking on *_M_p it gives an error:
Target request failed: Structure has no component named operator*..

The reason is the same - MI incorrectly process situations when type is
IncompleteType - which is Structure or Class from system headers usually
("string" in this case).