[Rgen] Add the needed code to make the objc_msgSend signatures.

[mandel-macaque]

Add the code that will calculate the signature needed in the objc_msgSend which will be the method that calls the native objc message.

Extra context

When we create a binding for a native type we need to be able to send 'messages' to the objc objects. From a C# developer perspective a message can be considered a method. So for example, the following objc code:

[object foo:bar];

Can be translated to:

objc_msgSend(object, sel_getUid("foo:"), bar);

We can say this process is similar to reflection and the Invoke method. Our bindings provide methods around objc_msgsend which we use to send the messaged with the arguments needed by the message. For example, a property with a NSString backing fields defined as:

[Export ("text")]
public string? Text { get; set; }

Results in the following generated code:

[BindingImpl (BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
public virtual string? Text {
	[Export ("text")]
	get {
		global::UIKit.UIApplication.EnsureUIThread ();
		if (IsDirectBinding) {
			return CFString.FromHandle (global::ObjCRuntime.Messaging.NativeHandle_objc_msgSend (this.Handle, Selector.GetHandle ("text")), false)!;
		} else {
			return CFString.FromHandle (global::ObjCRuntime.Messaging.NativeHandle_objc_msgSendSuper (this.SuperHandle, Selector.GetHandle ("text")), false)!;
		}
	}
	[Export ("setText:")]
	set {
		global::UIKit.UIApplication.EnsureUIThread ();
		var nsvalue = CFString.CreateNative (value);
		if (IsDirectBinding) {
			global::ObjCRuntime.Messaging.void_objc_msgSend_NativeHandle (this.Handle, Selector.GetHandle ("setText:"), nsvalue);
		} else {
			global::ObjCRuntime.Messaging.void_objc_msgSendSuper_NativeHandle (this.SuperHandle, Selector.GetHandle ("setText:"), nsvalue);
		}
		CFString.ReleaseNative (nsvalue);
	}
}

Our objc_msgSend method signatures are calculated based on the method parameters and live in the runtime. These objc_msgSend calls are generated by https://github.com/xamarin/xamarin-macios/blob/main/runtime/bindings-generator.cs#L20 For example a objc_msgSend signature for a method that takes a string and returns a string would be:

IntPtr_objc_msgSend_IntPtr

But this is a simplifications because there is a diff between sending a message to a super class (prefix super) or if it deals with a structure (stret).

More info can be found in the Apple documentation.

[github-actions]

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[github-actions]

⚠️ Your code has been reformatted. ⚠️

If this is not desired, add the actions-disable-autoformat label, and revert the reformatting commit.

If files unrelated to your change were modified, try reverting the reformatting commit + merging with the target branch (and push those changes).

[Copilot]

Copilot reviewed 5 out of 18 changed files in this pull request and generated 6 comments.

Files not reviewed (13)

• src/rgen/Microsoft.Macios.Transformer/Microsoft.Macios.Transformer.csproj: Language not supported
• src/rgen/Microsoft.Macios.Generator/Emitters/BindingSyntaxFactory.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/DataModel/TypeInfoComparer.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/Formatters/TypeInfoFormatter.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/DataModel/TypeInfo.Generator.cs: Evaluated as low risk
• tests/rgen/Microsoft.Macios.Generator.Tests/TestDataFactory.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/Emitters/BindingSyntaxFactory.Dlfcn.cs: Evaluated as low risk
• tests/rgen/Microsoft.Macios.Generator.Tests/DataModel/TypeInfoComparerTests.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/Formatters/ParameterFormatter.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/DataModel/Property.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/DataModel/TypeInfo.cs: Evaluated as low risk
• src/rgen/Microsoft.Macios.Generator/Extensions/SpecialTypeExtensions.cs: Evaluated as low risk
• tests/rgen/Microsoft.Macios.Generator.Tests/Emitters/GetObjCMessageSendMethodNameTests.cs: Evaluated as low risk

[github-actions]

⚠️ Your code has been reformatted. ⚠️

If this is not desired, add the actions-disable-autoformat label, and revert the reformatting commit.

If files unrelated to your change were modified, try reverting the reformatting commit + merging with the target branch (and push those changes).

[vs-mobiletools-engineering-service2]

✅ [PR Build] Build passed (Build packages) ✅

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Hash: d6c77b130249f1d853597ddac8b34dfd68be505b [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build] Build passed (Detect API changes) ✅

Pipeline on Agent
Hash: d6c77b130249f1d853597ddac8b34dfd68be505b [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build] Build passed (Build macOS tests) ✅

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Hash: 66016ce903d102c9c05b02a33da2c9d511f16d9c [PR build]

[vs-mobiletools-engineering-service2]

✅ API diff for current PR / commit

.NET ( No breaking changes )

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

❗ API diff vs stable (Breaking changes)

.NET ( ❗ Breaking changes ❗ )

• iOS: vsdrops gist ( ❗ Breaking changes ❗ )
• tvOS: vsdrops gist ( ❗ Breaking changes ❗ )
• MacCatalyst: vsdrops gist ( ❗ Breaking changes ❗ )
• macOS: vsdrops gist ( ❗ Breaking changes ❗ )

ℹ️ Generator diff

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

Pipeline on Agent
Hash: d6c77b130249f1d853597ddac8b34dfd68be505b [PR build]

[vs-mobiletools-engineering-service2]

💻 [PR Build] Tests on macOS M1 - Mac Monterey (12) passed 💻

✅ All tests on macOS M1 - Mac Monterey (12) passed.

Pipeline on Agent
Hash: 66016ce903d102c9c05b02a33da2c9d511f16d9c [PR build]

[vs-mobiletools-engineering-service2]

💻 [CI Build] Windows Integration Tests passed 💻

✅ All Windows Integration Tests passed.

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Hash: db167d5914806bf3615c3e4e23f41919bf3e1222 [PR build]

[vs-mobiletools-engineering-service2]

💻 [PR Build] Tests on macOS X64 - Mac Sonoma (14) passed 💻

✅ All tests on macOS X64 - Mac Sonoma (14) passed.

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Hash: 66016ce903d102c9c05b02a33da2c9d511f16d9c [PR build]

[vs-mobiletools-engineering-service2]

💻 [PR Build] Tests on macOS arm64 - Mac Sequoia (15) passed 💻

✅ All tests on macOS arm64 - Mac Sequoia (15) passed.

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Hash: 66016ce903d102c9c05b02a33da2c9d511f16d9c [PR build]

[vs-mobiletools-engineering-service2]

💻 [PR Build] Tests on macOS M1 - Mac Ventura (13) passed 💻

✅ All tests on macOS M1 - Mac Ventura (13) passed.

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[vs-mobiletools-engineering-service2]

🔥 [CI Build] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

0 tests crashed, 2 tests failed, 113 tests passed.

Failures

❌ generator tests

1 tests failed, 4 tests passed.

• Roslyn Generator tests: Failed (Execution failed with exit code 1)

Html Report (VSDrops) Download

❌ monotouch tests (macOS)

1 tests failed, 11 tests passed.

• monotouch-test/macOS/Debug (ARM64): Failed (Test run failed.
  Tests run: 3107 Passed: 2886 Inconclusive: 4 Failed: 1 Ignored: 220)

Html Report (VSDrops) Download

Successes

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 4 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 8 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 8 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

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Hash: 15a79c6e8813d7483bda6fb83fe0ca4ee8a4e0a7 [PR build]