Generally, failing to parse expressions at the level of abstraction of the source code being debugged: I find it fails on user defined operators, can't resolve

Generally, failing to parse expressions at the level of abstraction of the source code being debugged: I find it fails on user defined operators, can't resolve overloaded functions, etc. Even being able to reliably evaluate C++ expressions is far from what I want: I want to be able to execute arbitrary C++ statements (including loops), use templated objects that weren't instantiated at compile time, etc. I feel like this might be close to possible using, say, the LLVM JIT, although I haven't seen anything that implies anyone is trying to build it. edit: for example (stock gcc/gdb on Ubuntu 12.04): #include <iostream> int main() { std::cout << "foo\n"; } in gdb, break at main: (gdb) p std::cout << "foo\n" Cannot resolve function operator<< to any overloaded instance edit edit: lldb doesn't fare much better (OSX 10.9): (lldb) p std::cout << "foo\n" error: no member named 'cout' in namespace 'std' error: 1 errors parsing expression