[mono][wasm] Allow methods with finally clauses to be AOTed. #63065
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vargaz
requested review from
BrzVlad,
EgorBo,
imhameed,
lambdageek,
marek-safar,
SamMonoRT and
thaystg
as code owners
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I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label. |
ghost
assigned 
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/azp run runtime-manual |
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Azure Pipelines successfully started running 1 pipeline(s). |
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Not sure if this is related, but in CoreCLR we try to clone "finally" block for the exception-free case: so I guess it can help to avoid falling back to interpreter in most cases |
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This PR only runs finally blocks with the interpreter during exception handling, the normal case runs them using AOT. |
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/azp run runtime-manual |
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Azure Pipelines successfully started running 1 pipeline(s). |
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The remaining WASM failures all look like an OOM while AOTing Microsoft.CodeAnalysis.CSharp.dll. |
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/azp run runtime-manual |
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Azure Pipelines successfully started running 1 pipeline(s). |
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/azp run runtime-manual |
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Azure Pipelines successfully started running 1 pipeline(s). |
vargaz
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This is implemented by running the finally clause with the interpreter. Methods with clauses have additional code generated, which: * Saves the IL state (pc+arguments+locals) into a MonoMethodILState structure. * Pushes an LMF frame on the LMF stack of type MONO_LMFEXT_IL_STATE. The LMF frame points to the il state. During EH, if such an LMF frame is found, and the IL pc in the il state points inside a clause, then an interpreted version of the method is created, and the finally clause is ran using the interpreter using the il state as the starting state.
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/azp run runtime-manual |
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Azure Pipelines successfully started running 1 pipeline(s). |
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Failures are unrelated. |
BrzVlad
approved these changes
Jan 3, 2022
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This is implemented by running the finally clause with the interpreter.
Methods with clauses have additional code generated, which:
structure.
The LMF frame points to the il state.
During EH, if such an LMF frame is found, and the IL pc in the
il state points inside a clause, then an interpreted version
of the method is created, and the finally clause is ran using
the interpreter using the il state as the starting state.