[PLAT-13024] Send native mapped information in stack traces from system exceptions

[kstenerud]

Goal

On Cocoa devices, get the corresponding native stack trace entries for a system exception, and add the necessary information for the backend to be able to map it back to the CSharp code.

Design

We now use il2cpp_native_stack_trace() to fetch the native frame addresses from the transpiled C++ code, which can then be mapped back to the CSharp code using LineNumberMappings.json. This requires knowledge of the binary image the frame address corresponds to, which we can already find using the LoadedImages class.

We now send the following per-frame data in Unity stack traces on Cocoa:

{
  "frameAddress": "4395873640",
  "method": "Void Throw()",
  "machoFile": "/private/var/containers/Bundle/Application/D9733826-3F83-4126-9536-BDA4D980DF65/BugsnagUnity.app/Frameworks/UnityFramework.framework/UnityFramework",
  "machoLoadAddress": "4386652160",
  "machoUUID": "4c3afc07-a7af-2036-b53a-18a7828648ef",
  "inProject": true
},

I've written up a HOWTO for mapping this data back to the .cs file and line number.

Testing

Added e2e test that verifies the new frame attributes on cocoa.

[bugsnagbot]

Build size impact

Format	Size impact of Bugsnag (kB)
IL2CPP APK	2606.47
IL2CPP IPA	1700.21

Generated by 🚫 Danger

[richardelms]

thanks 👍