Fix INTOP_UNBOX_ANY on wasm

[radekdoulik]

Handle IL unbox helpers

Split unbox.any into 2 opcodes, by adding unbox.end

Add calli to make interpolated strings work

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[Copilot]

Pull Request Overview

This PR fixes the INTOP_UNBOX_ANY instruction in the WebAssembly interpreter by adding support for IL unbox helpers. The key changes enable the interpreter to handle cases where unbox operations need to call IL methods rather than native helpers.

• Adds support for executing IL target methods during unbox operations
• Introduces a callback mechanism to handle post-execution cleanup
• Ensures proper initialization of new interpreter frame objects

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/coreclr/vm/interpexec.h	Adds std::function include and delegateBeforeExit member to InterpMethodContextFrame
src/coreclr/vm/interpexec.cpp	Implements IL unbox helper support with proper frame initialization and cleanup

[radekdoulik]

If this looks good, I can modify the unbox.any.generic opcode too. I suppose the non generic pMT will always return false for IsNullable(), is that right?

[jkotas]

If this looks good

@kg @janvorli @BrzVlad Does this look good to you?

[radekdoulik]

With #120199 in place + changes in this PR we are able to run

TestCallingConvention0(1, 22.0f, 3, 44.0, 5, 66.0);

static void TestCallingConvention0(int a, float b, int c, double d, int e, double f)
{
    Console.WriteLine("TestCallingConvention0: a = {0}, b = {1}, c = {2}, d = {3}, e = {4}, f = {5}", a, b, c, d, e, f);
}

[radekdoulik]

And with the added calli even the interpolated strings work now. Like

int answer = 42;
string answerString = "The ultimate answer";
Console.WriteLine($"{answerString} is {answer}. Some double: {answer + 0.123456789}");

[radekdoulik]

Would it make more sense to name the opcodes unbox.any.start and unbox.any.end? (and similar for the generic version)

[radekdoulik]

@kg @janvorli @BrzVlad does it looks good or do you want some changes?

[kg]

I don't see anything that absolutely needs to change, so I'm OK with this. Thanks for doing all the work to fix it!

[radekdoulik]

Thanks for all the feedback, I have opened above issue to address the remaining feedback.