UnityMixedCallstack is a Visual Studio 2015/2017 extension to help debug native applications embedding Mono, like Unity.
Mono doesn't generate debug symbols that Visual Studio understands for jitted functions.
As a result, Visual Studio can not show anything meaningful for managed stack frames.
This fork of PmipMyCallstack has been developed for developers at unity-technologies and support has been added to our clone of mono, which can be found here https://github.com/Unity-Technologies/mono
This version requires you to set the UNITY_MIXED_CALLSTACK environment variable before launching visual studio and before launching Unity (or using our mono standalone), which will tell the mono runtime to write out each jit'd function to a file.
The original PmipMyCallstack plugin created by JB Evain would call the function mono_pmip on every frame that doesn't belong to a module to show a meaningful representation of the stack frame and display it natively in the call stack window. This plugin does the same thing, but instead of calling over ipc, mono writes a file with the jit information and we lookup the IP from that. This allows us to open much larger callstacks, and many frames without visual studio hanging for a long time (an issue since Unity has so many threads).
In this version we also display the module the managed code belongs to. This gives you a nice callstack to look at in visual studio.
Remember, you need to disable Just My Code in the debugger options (Debug -> Options...) to expand the [External Code] entry in the callstack.
