JIT: fill two gaps in wasm codegen - #132259
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genReturnSuspend pushed a zero of the native return type to keep the epilog's return well typed. A method returning through a buffer lowers to a wasm function with no result, so there is nothing to push, and its compRetNativeType (TYP_STRUCT) fell into the default arm. Vector128 returns by value as a v128 and was missing too. genEmitHelperCall only had signatures for four of the no-arg managed throw helpers. Add the rest; they are reachable from the unsupported intrinsic and out-of-range immediate paths. Neither reaches the product build, which crossgens only CoreLib and always passes -O. Found crossgenning System.Private.Xml, whose XmlTextReaderImpl.ParseTextAsync returns a ValueTuple`4 by buffer. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR addresses two missing cases in the WebAssembly JIT backend to prevent invalid wasm codegen in async-suspend paths and to ensure managed throw helpers can always be emitted with a correct wasm signature.
Changes:
- Update
genReturnSuspendto avoid pushing a dummy return value for retbuf returns (wasm functions with no result) and to handleVector128<T>(v128) returns. - Extend
genEmitHelperCall’s hard-coded signature table to include additional no-arg managed throw helpers that are reachable from existing JIT paths.
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Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara |
This was referenced Aug 13, 2026
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Aug 13, 2026
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Changes look good to me. The NativeAOT failure looks like it could be related to #132030, and the Wasm test failure is the existing GC issue it looks like.
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genReturnSuspend pushed a zero of the native return type to keep the epilog's return well typed. A method returning through a buffer lowers to a wasm function with no result, so there is nothing to push, and its compRetNativeType (TYP_STRUCT) fell into the default arm. Vector128 returns by value as a v128 and was missing too.
genEmitHelperCall only had signatures for four of the no-arg managed throw helpers. Add the rest; they are reachable from the unsupported intrinsic and out-of-range immediate paths.
Found crossgenning System.Private.Xml, whose XmlTextReaderImpl.ParseTextAsync returns a ValueTuple`4 by buffer.