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JIT: Avoid using type info from GDV guesses during import #72376

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merged 2 commits into from
Jul 19, 2022
Merged

JIT: Avoid using type info from GDV guesses during import #72376

merged 2 commits into from
Jul 19, 2022

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jakobbotsch
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We can only use this type information after they have been expanded and
if we are on the happy path.

Fix #72363

@jakobbotsch
JIT: Avoid using type info from GDV guesses during import
b901515 
We can only use this type information after they have been expanded and
if we are on the happy path.

Fix dotnet#72363
@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Jul 18, 2022
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Issue Details

We can only use this type information after they have been expanded and
if we are on the happy path.

Fix #72363

Author: jakobbotsch
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area-CodeGen-coreclr
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@jakobbotsch
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Covariant returns would have the same problem but resolveVirtualMethod currently fails for them with CORINFO_DEVIRTUALIZATION_FAILED_SLOT, so I think generics is the only case we can see this.

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cc @dotnet/jit-contrib PTAL @AndyAyersMS @EgorBo

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AndyAyersMS approved these changes Jul 18, 2022
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This bug is also in 6.0, right?

We should consider porting the fix there.

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This bug is also in 6.0, right?

Doesn't look like it, we don't manage to do GDV for the test in 6.0. Looks like #56254 added that support.

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The bug might exist in 6.0 R2R though, IIUC that worked before #56254.

@runfoapp runfoapp bot mentioned this pull request Jul 19, 2022
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The failure is #72429.

I'll choose not to backport this given the above.

@jakobbotsch jakobbotsch merged commit 2f5606d into dotnet:main Jul 19, 2022
@jakobbotsch jakobbotsch deleted the fix-72363 branch July 19, 2022 14:54
@runfoapp runfoapp bot mentioned this pull request Jul 19, 2022
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[libraries-pgo] NRE in System.Collections.Immutable.Tests.ImmutableArrayBuilderTest.IndexOf
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