[release/8.0-staging] [Mono AOT] Fix error when returning zero sized struct #107198
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Friendly reminder that Code Complete for the October Release is September 9. If we want this fix to be included in that release, please merge this PR before that date. |
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/azp run runtime-extra-platforms |
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Azure Pipelines successfully started running 1 pipeline(s). |
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/ba-g the runtime failures seem to be coming from browser-wasm linux Release WasmBuildTests #106663 . The runtime-extra-platforms fails are unrelated. |
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Backport of #106013 to release/8.0-staging
/cc @jkurdek
Customer Impact
Customer reported #103628
The scenario is to use an
AutoorSequentiallayout struct with no fields as a return value of a method. Mono AOT compiler will fail in that case (the compiler itself will fail). The only workaround is to change the struct to not be auto/sequential.This caused different compilation failures on both
ArgVTypeAsScalarandArgVTypeInRegcodepaths. Fix forArgVTypeAsScalarpath involved rounding up a struct to one byte when empty. This matches a behaviour of not specifying a layout attribute on the struct. (#103628) TheArgVTypeInRegproduces malformed LLVM-IR. The fix was to align types. (#106259)Regression
Testing
New CI regression test.
Risk
Low. Any potential issues which this fix could introduce would be for scenarios where the compiler failed previously.