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Put Crossgen2 in sync with #54235 #54438

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merged 5 commits into from
Jun 23, 2021
Merged

Put Crossgen2 in sync with #54235 #54438

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9ad2183
Put Crossgen2 in sync with #54235
trylek Jun 18, 2021
5f684ca
Fine-tune the zero-size struct check
trylek Jun 18, 2021
6c209bc
Remove the issues.targets entry for the LayoutClassTest this PR shoul…
trylek Jun 19, 2021
d7cfe53
Update CG2 unit tests to the modified type layout behavior
trylek Jun 20, 2021
872f1e6
Fix bad merge
trylek Jun 22, 2021
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5 changes: 2 additions & 3 deletions src/coreclr/tools/Common/TypeSystem/Common/MetadataFieldLayoutAlgorithm.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -782,10 +782,9 @@ public LayoutInt CalculateFieldBaseOffset(MetadataType type, bool requiresAlign8
if (!type.IsValueType && type.HasBaseType)
{
cumulativeInstanceFieldPos = type.BaseType.InstanceByteCountUnaligned;
if (!type.BaseType.InstanceByteCountUnaligned.IsIndeterminate)
if (!cumulativeInstanceFieldPos.IsIndeterminate)
{
cumulativeInstanceFieldPos = type.BaseType.InstanceByteCountUnaligned;
if (type.BaseType.IsZeroSizedReferenceType && ((MetadataType)type.BaseType).HasLayout())
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Can IsZeroSizedReferenceType propety be deleted as well? It does not appear to be used anywhere after this change.

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I suspect we still need to do something about the zero-sized layout types because runtime artificially bumps up their size to 1 even though it rolls back the change when calculating the layout for a derived type. I guess that, as a first step, I need to see how the Pri1 tests look on the different architectures after my change. Other than that, I was under the impression that IsZeroSizedReferenceType was a pre-existing NativeAOT construct, not a Crossgen2-specific addition, but I may be mistaken about this.

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IsZeroSizedReferenceType was added in #46769

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Thanks for sharing the link to the original PR. ARM tests are already failing in the Pri1 tests exactly because of the missing zero-sized layout compensation, I believe the trick is not about removing the check but figuring out the proper place for it, that's my next step.

if (requiresAlignedBase && type.BaseType.IsZeroSizedReferenceType && ((MetadataType)type.BaseType).HasLayout())
{
cumulativeInstanceFieldPos += LayoutInt.One;
}
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4 changes: 2 additions & 2 deletions src/coreclr/tools/Common/TypeSystem/Interop/IL/MarshalUtils.cs
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Expand Up @@ -23,8 +23,8 @@ public static bool IsBlittableType(TypeDesc type)
&& !baseType.IsWellKnownType(WellKnownType.Object)
&& !baseType.IsWellKnownType(WellKnownType.ValueType);

// Type is blittable only if parent is also blittable and is not empty.
if (hasNonTrivialParent && (!IsBlittableType(baseType) || baseType.IsZeroSizedReferenceType))
// Type is blittable only if parent is also blittable.
if (hasNonTrivialParent && !IsBlittableType(baseType))
{
return false;
}
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4 changes: 2 additions & 2 deletions src/coreclr/tools/aot/ILCompiler.TypeSystem.ReadyToRun.Tests/MarshalUtilsTests.cs
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Expand Up @@ -74,10 +74,10 @@ public void IsBlittableType_TypeWithBlittableBase_ReturnsTrue(string className)
[InlineData("ClassWithExplicitEmptyBase")]
[InlineData("ClassWithExplicitEmptySizeZeroBase")]
[InlineData("ClassWithSequentialEmptyBase")]
public void IsBlittableType_TypeWithEmptyBase_ReturnsFalse(string className)
public void IsBlittableType_TypeWithEmptyBase_ReturnsTrue(string className)
{
TypeDesc classWithEmptyBase = _testModule.GetType("Marshalling", className);
Assert.False(MarshalUtils.IsBlittableType(classWithEmptyBase));
Assert.True(MarshalUtils.IsBlittableType(classWithEmptyBase));
}
}
}
3 changes: 0 additions & 3 deletions src/tests/issues.targets
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Expand Up @@ -123,9 +123,6 @@
<ExcludeList Include="$(XunitTestBinBase)/tracing/eventpipe/eventsvalidation/ThreadPool/*">
<Issue>https://github.com/dotnet/runtime/issues/48727</Issue>
</ExcludeList>
<ExcludeList Include="$(XunitTestBinBase)/Interop/LayoutClass/LayoutClassTest/*">
<Issue>https://github.com/dotnet/runtime/issues/54316</Issue>
</ExcludeList>
</ItemGroup>

<!-- All Unix targets on all runtimes -->
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