[WIP] fix: AOT interop with managed .NET runtimes

[jpnurmi]

📜 Description

WIP: Prevent the Cocoa SDK from capturing managed .NET exceptions.

First of all, we need to avoid overriding Mono's Mach exception port for EXC_BAD_ACCESS and EXC_ARITHMETIC. Secondly, the Sentry's signal handler first invokes Mono's signal handler to give it a chance to convert it into a managed exception and redirect execution into the managed runtime’s exception handling machinery, so that managed code can catch and process the exception as if it were a normal .NET exception. Finally, Sentry's crash capturing kicks in only and only if we do not detect IP/SP modifications in the context.

💡 Motivation and Context

Fixes a long-standing issue with redundant crash events with Sentry.NET on iOS:

• Prevent Native/Cocoa SDKs from capturing errors that also get captured by .NET sentry-dotnet#3954

See also similar Sentry Native changes for Android:

• fix: AOT interop with managed .NET runtimes sentry-native#1392

💚 How did you test it?

1. Manually with Sentry.Samples.Maui in Sentry.NET:
   • WIP: Prevent Cocoa SDK from capturing errors that also get captured by .NET sentry-dotnet#4537
2. With the newly developed Sentry .NET integration test for iOS:
   • iOS & Android integration tests sentry-dotnet#4559

📝 Checklist

You have to check all boxes before merging:

• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
3889	1	3888	52

View the top 1 failed test(s) by shortest run time

iOS_SwiftUI_UITests.LaunchUITests::testCaptureErrorReturnsValidId

Stack Traces | 0s run time

.../iOS-SwiftUI/iOS-SwiftUI-UITests/LaunchUITests.swift:56 - Failed to tap "Capture Error" Button: Timed out while evaluating UI query.

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1232.57 ms	1259.68 ms	27.11 ms
Size	23.75 KiB	975.29 KiB	951.55 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
7c7ac56	1225.90 ms	1250.22 ms	24.33 ms
8ea5293	1242.70 ms	1262.25 ms	19.55 ms
35c962f	1207.61 ms	1235.90 ms	28.29 ms
aa98fe8	1227.69 ms	1253.18 ms	25.50 ms
339539a	1219.58 ms	1254.63 ms	35.05 ms
0ac4c65	1236.85 ms	1267.84 ms	30.98 ms
6ee4973	1228.42 ms	1252.26 ms	23.84 ms
b13e93a	1236.24 ms	1247.33 ms	11.08 ms
2e79f5f	1220.53 ms	1249.35 ms	28.82 ms
5ae9ff1	1222.31 ms	1250.96 ms	28.65 ms

App size

Revision	Plain	With Sentry	Diff
7c7ac56	23.75 KiB	902.49 KiB	878.74 KiB
8ea5293	23.75 KiB	852.24 KiB	828.49 KiB
35c962f	23.75 KiB	854.77 KiB	831.02 KiB
aa98fe8	23.75 KiB	891.01 KiB	867.26 KiB
339539a	23.75 KiB	968.24 KiB	944.50 KiB
0ac4c65	23.75 KiB	968.24 KiB	944.50 KiB
6ee4973	23.75 KiB	896.53 KiB	872.79 KiB
b13e93a	23.75 KiB	855.37 KiB	831.62 KiB
2e79f5f	23.75 KiB	928.87 KiB	905.12 KiB
5ae9ff1	23.74 KiB	971.82 KiB	948.08 KiB

[jpnurmi]

Screen.Recording.2025-09-18.at.11.54.52.mov