title: In gem5, how do I know the specific location of the class？
body: <p>This question feels silly, but it really puzzles me. When I look at the source code of gem5, I always come across classes like <code>typedef typename CPUPol::IQ IQ;</code>  <code>typedef typename Impl::DynInstPtr DynInstPtr;</code>. I want to see what functions are in these classes. But in vscode, I cannot jump to where they are defined. I can't even search for them. I also didn't find some files having similiar names with the class names.</p>