工具跟踪应用程序而无需更改代码？

I've inherited a rather large WPF application, and I need to generate application traces for a significant portion of it. Because of the complexity of the project, I'd like to do this without making any changes to the code base, if possible. I mostly need to know the stack deltas, ie when a function call or return takes place. Is there a tool or methodology that will get me this trace with (preferably) no code changes? Is this even possible to do without writing a tool to add Trace calls to the code? I've inherited a rather large WPF application,