[Wasm RyuJit] Add JIT config JitWasmNyiToR2RUnsupported

[AndyAyersMS]

Set this to allow crossgen2 for Wasm to continue even if there is a method that runs into an NYI_WASM in the JIT.

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[AndyAyersMS]

For example

;; default behavior

Processing 2 dependencies
Compiling [wasm-test]Program.NonLocalContinuation(int32)
Single method repro args:--singlemethodtypename "Program,wasm-test" --singlemethodname "NonLocalContinuation" --singlemethodindex 1
C:\repos\runtime2\src\coreclr\jit\fgwasm.cpp:1075
Assertion failed 'NYI_WASM: Method has blocks only reachable via EH' in 'Program:NonLocalContinuation(int):int' during 'Wasm control flow' (IL size 69; hash 0xc5ede80b; FullOpts)

Unhandled exception. System.Exception: Child process 'c:\repos\runtime2\artifacts\bin\coreclr\windows.x64.Debug\x64\crossgen2\crossgen2.exe' failed with exit code -2147483645

;; with --codegenopt:JitWasmNyiToR2RUnsupported=1

Processing 2 dependencies
Compiling [wasm-test]Program.NonLocalContinuation(int32)
Single method repro args:--singlemethodtypename "Program,wasm-test" --singlemethodname "NonLocalContinuation" --singlemethodindex 1
Info: Method `[wasm-test]Program.NonLocalContinuation(int32)` was not compiled because `JIT implementation limitation` requires runtime JIT
Compiling [wasm-test]Program.Main()
Single method repro args:--singlemethodtypename "Program,wasm-test" --singlemethodname "Main" --singlemethodindex 1
Processing 0 dependencies
Processing 1 dependencies
Moved to phase 1
Emitting R2R Wasm file: C:\Users\andya\AppData\Local\Temp\tmp4hd3w5.tmp\test-module.wasm

[AndyAyersMS]

PTAL @dotnet/jit-contrib @davidwrighton

[Copilot]

Pull request overview

Adds a Wasm-specific JIT config intended to allow crossgen2 to continue when codegen hits NYI_WASM, by mapping those NYIs to ReadyToRun “unsupported” failures.

Changes:

• Adds new JIT config value JitWasmNyiToR2RUnsupported under TARGET_WASM.
• Updates NYI_WASM to optionally call implReadyToRunUnsupported() (instead of the existing NYI path) based on the new config.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/coreclr/jit/jitconfigvalues.h	Introduces the new Wasm config flag intended to control NYI_WASM behavior.
src/coreclr/jit/error.h	Updates NYI_WASM macro to optionally convert NYIs into R2R-unsupported failures.

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[AndyAyersMS]

With this set a debug SPC still runs into two methods with asserts, see #125756

[Copilot]

Pull request overview

Adds a Wasm-specific JIT config intended to let crossgen2 continue when encountering Wasm NYI paths by mapping NYI_WASM to an R2R-unsupported failure instead of the usual NYI handling.

Changes:

• Introduce JitWasmNyiToR2RUnsupported JIT config value under TARGET_WASM.
• Update NYI_WASM macro to optionally call implReadyToRunUnsupported() when the config is enabled (DEBUG-only in this PR).
• Add a Wasm NYI check in emitTypeSize and adjust Wasm codegen default handling to consult the new config.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/coreclr/jit/jitconfigvalues.h	Adds the new Wasm-only JIT config knob.
src/coreclr/jit/error.h	Changes NYI_WASM macro behavior based on the new config.
src/coreclr/jit/emit.h	Uses NYI_WASM when emitTypeSizes[...] is unexpectedly 0.
src/coreclr/jit/codegenwasm.cpp	Adds config-aware handling for unimplemented opcodes in Wasm codegen.

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[adamperlin]

Looks good to me! This will be very useful.

[AndyAyersMS]

OSX Build errors like:

  ld: warning: Could not find or use auto-linked library 'swiftsys_time'
  ld: warning: Could not find or use auto-linked library 'swift_time'
  ld: warning: Could not find or use auto-linked library 'swiftunistd'
  ld: warning: Could not find or use auto-linked library 'swift_Builtin_float'
  ld: warning: Could not find or use auto-linked library 'swift_math'
  ld: warning: Could not find or use auto-linked library 'swift_errno'
  ld: warning: Could not find or use auto-linked library 'swift_signal'
  ld: warning: Could not find or use auto-linked library 'swift_stdio'
  Undefined symbols for architecture arm64:
    "__swift_FORCE_LOAD_$_swift_Builtin_float", referenced from:
        __swift_FORCE_LOAD_$_swift_Builtin_float_$_pal_swiftbindings in libSystem.Security.Cryptography.Native.Apple.a(pal_swiftbindings.o)
       (maybe you meant: __swift_FORCE_LOAD_$_swift_Builtin_float_$_pal_swiftbindings)

[EgorBo]

OSX Build errors like:

That is also from #125757

[AndyAyersMS]

/ba-g OSX build issues