[perf] [runtime] Optimize startup by using function pointers instead of delegates for our native->managed bridge.

[rolfbjarne]

Use function pointers to our managed callbacks instead of delegates for the native->managed bridge. This makes execution faster on AOT (because the AOT compiler can just emit the native function address, no need to go through the expensive marshalling machinery).

This involved a few changes to make the managed callbacks only use blittable types in the function signature:

• Use sbyte / int8_t instead of bool.
• Use pointers instead of out/ref arguments.
• Use IntPtr instead of string arguments.

The code rarely shows up in timing profiles before the change, and never after. This means that time-wise this doesn't save all that much, because there wasn't much to gain to begin with (but it's still a gain).

Memory-wise, we're now allocation 0,19 MiB less on startup (17,61 MiB vs 17,42 MiB).

[vs-mobiletools-engineering-service2]

❗ API diff for current PR / commit (Breaking changes)

Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
• watchOS (no change detected)
• macOS (no change detected)

.NET (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)

• iOS: vsdrops gist (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

❗ API diff vs stable (Breaking changes)

Legacy Xamarin (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)

• iOS: vsdrops gist (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)

• iOS: vsdrops gist (:heavy_exclamation_mark: Breaking changes :heavy_exclamation_mark:)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

Pipeline on Agent
Hash: 113db5e15b8a97d228a0d44e1360ff860014c75c [PR build]

[vs-mobiletools-engineering-service2]

📚 [PR Build] Artifacts 📚

Packages generated

View packages

• Microsoft.iOS.Bundle.16.1.556-ci.pr.gh16702.pkg
• Microsoft.iOS.Ref.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Runtime.ios-arm.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Runtime.ios-arm64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Sdk.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Templates.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.iOS.Windows.Sdk.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.MacCatalyst.Bundle.16.1.556-ci.pr.gh16702.pkg
• Microsoft.MacCatalyst.Ref.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.MacCatalyst.Sdk.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.MacCatalyst.Templates.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.macOS.Bundle.13.0.1111-ci.pr.gh16702.pkg
• Microsoft.macOS.Ref.13.0.1111-ci.pr.gh16702.nupkg
• Microsoft.macOS.Runtime.osx-arm64.13.0.1111-ci.pr.gh16702.nupkg
• Microsoft.macOS.Runtime.osx-x64.13.0.1111-ci.pr.gh16702.nupkg
• Microsoft.macOS.Sdk.13.0.1111-ci.pr.gh16702.nupkg
• Microsoft.macOS.Templates.13.0.1111-ci.pr.gh16702.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-7.0.100.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-7.0.100.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-7.0.100.13.0.1111-ci.pr.gh16702.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-7.0.100.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.NET.Workload.iOS.16.1.556-ci.pr.gh16702.msi
• Microsoft.tvOS.Bundle.16.1.556-ci.pr.gh16702.pkg
• Microsoft.tvOS.Ref.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.tvOS.Sdk.16.1.556-ci.pr.gh16702.nupkg
• Microsoft.tvOS.Templates.16.1.556-ci.pr.gh16702.nupkg
• xamarin.ios-16.1.1.429.pkg
• xamarin.mac-9.0.0.429.pkg

Pipeline on Agent XAMBOT-1162.Monterey'
Hash: 113db5e15b8a97d228a0d44e1360ff860014c75c [PR build]

[vs-mobiletools-engineering-service2]

❌ [PR Build] Tests on macOS M1 - Mac Big Sur (11.5) failed ❌

Failed tests are:

• introspection
• monotouch-test

Pipeline on Agent
Hash: 113db5e15b8a97d228a0d44e1360ff860014c75c [PR build]

[vs-mobiletools-engineering-service2]

🚀 [CI Build] Test results 🚀

Test results

✅ All tests passed on VSTS: simulator tests.

🎉 All 223 tests passed 🎉

Tests counts

✅ bcl: All 69 tests passed. Html Report (VSDrops) Download
✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests: All 1 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 7 tests passed. Html Report (VSDrops) Download
✅ framework: All 8 tests passed. Html Report (VSDrops) Download
✅ generator: All 2 tests passed. Html Report (VSDrops) Download
✅ interdependent_binding_projects: All 7 tests passed. Html Report (VSDrops) Download
✅ install_source: All 1 tests passed. Html Report (VSDrops) Download
✅ introspection: All 8 tests passed. Html Report (VSDrops) Download
✅ linker: All 65 tests passed. Html Report (VSDrops) Download
✅ mac_binding_project: All 1 tests passed. Html Report (VSDrops) Download
✅ mmp: All 2 tests passed. Html Report (VSDrops) Download
✅ mononative: All 12 tests passed. Html Report (VSDrops) Download
✅ monotouch: All 23 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ mtouch: All 1 tests passed. Html Report (VSDrops) Download
✅ xammac: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 8 tests passed. Html Report (VSDrops) Download
✅ xtro: All 2 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: [PR build]