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[release/8.0.1xx-xcode15.1] [Blocks] Remove a block callback validation that's apparently too eager. #20700

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The validation verifies that the function pointer for a block callback is the
same the return value from the method's
MethodInfo.MethodHandle.GetFunctionPointer() method.

In actual code, it's equivalent to validating that the following always prints "Equal: true":

[UnmanagedCallersOnly]
public static void Invoke () {}

static void Test ()
{
    delegate* unmanaged<void> fptr1 = &Invoke;
    IntPtr fptr2 = GetType ().GetMethod ("Invoke").MethodHandle.GetFunctionPointer ();
    Console.WriteLine ($"fptr1: 0x{((IntPtr) fptr1).ToString ("x")}");
    Console.WriteLine ($"fptr2: 0x{fptr2.ToString ("x")}");
    Console.WriteLine ($"Equal: ((IntPtr) fptr1) == fptr2}"); // prints "Equal: true" for me
}

However, this isn't documented, and some feedback indicates it's certainly not
a valid assumption for CoreCLR:

https://discord.com/channels/732297728826277939/732582981163548703/1242473425759633488

And there's also a customer running into this validation, apparently withou cause:
https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2054534

So just remove it.

Backport of #20625

The validation verifies that the function pointer for a block callback is the
same the return value from the method's
MethodInfo.MethodHandle.GetFunctionPointer() method.

In actual code, it's equivalent to validating that the following always prints "Equal: true":

```cs
[UnmanagedCallersOnly]
public static void Invoke () {}

static void Test ()
{
    delegate* unmanaged<void> fptr1 = &Invoke;
    IntPtr fptr2 = GetType ().GetMethod ("Invoke").MethodHandle.GetFunctionPointer ();
    Console.WriteLine ($"fptr1: 0x{((IntPtr) fptr1).ToString ("x")}");
    Console.WriteLine ($"fptr2: 0x{fptr2.ToString ("x")}");
    Console.WriteLine ($"Equal: ((IntPtr) fptr1) == fptr2}"); // prints "Equal: true" for me
}
```

However, this isn't documented, and some feedback indicates it's certainly not
a valid assumption for CoreCLR:

https://discord.com/channels/732297728826277939/732582981163548703/1242473425759633488

And there's also a customer running into this validation, apparently withou cause:
https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2054534

So just remove it.
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💻 [PR Build] Tests on macOS M1 - Mac Big Sur (11.5) passed 💻

All tests on macOS M1 - Mac Big Sur (11.5) passed.

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💻 [PR Build] Tests on macOS M1 - Mac Ventura (13.0) passed 💻

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✅ API diff for current PR / commit

NET (empty diffs)
  • iOS: (empty diff detected)
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🚀 [CI Build] Test results 🚀

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✅ All tests passed on VSTS: simulator tests.

🎉 All 95 tests passed 🎉

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✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests: All 1 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
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✅ generator: All 1 tests passed. Html Report (VSDrops) Download
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✅ linker: All 40 tests passed. Html Report (VSDrops) Download
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⚠️ xammac: No tests selected. Html Report (VSDrops) Download
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✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

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@rolfbjarne rolfbjarne merged commit 80944cf into xamarin:release/8.0.1xx-xcode15.1 Jun 19, 2024
64 checks passed
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4 participants