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Merged
jtschuster merged 12 commits into from
Sep 22, 2025
Merged

Don't warn if we can't find the backing field in trim tools #119820

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f576285
Don't warn if we can't find the backing field
jtschuster Sep 17, 2025
41d4bfb
Re-add warning for mismatched backing fields found in get vs set
jtschuster Sep 17, 2025
250c973
Merge branch 'main' of https://github.com/dotnet/runtime into AutoPro…
jtschuster Sep 17, 2025
7201195
Don't warn for mismatching backing fields
jtschuster Sep 17, 2025
79738ce
Apply suggestion from @Copilot
jtschuster Sep 17, 2025
076c3de
Apply suggestion from @Copilot
jtschuster Sep 17, 2025
16ff81b
PR Feedback: only check for existing backing field annotation when th…
jtschuster Sep 18, 2025
bf25161
Merge branch 'AutoPropBackingFieldNoWarn' of https://github.com/jtsch…
jtschuster Sep 18, 2025
b14b64f
Merge branch 'main' of https://github.com/dotnet/runtime into AutoPro…
jtschuster Sep 18, 2025
38c4684
Merge branch 'main' into AutoPropBackingFieldNoWarn
jtschuster Sep 18, 2025
0698bd6
Merge branch 'AutoPropBackingFieldNoWarn' of https://github.com/jtsch…
jtschuster Sep 18, 2025
0f3eb4e
Fix analyzer tests
jtschuster Sep 18, 2025
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35 changes: 8 additions & 27 deletions src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/Dataflow/FlowAnnotations.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -592,41 +592,22 @@ protected override TypeAnnotations CreateValueFromKey(TypeDesc key)
}
}

if (IsAutoProperty(property))
FieldDesc backingField = backingFieldFromSetter ?? backingFieldFromGetter!;
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if (backingField is not null)
{
FieldDesc? backingField = null;
if ((property.SetMethod is not null
&& property.SetMethod.HasCustomAttribute("System.Runtime.CompilerServices", "CompilerGeneratedAttribute")
&& backingFieldFromSetter is null)
|| (property.GetMethod is not null
&& property.GetMethod.HasCustomAttribute("System.Runtime.CompilerServices", "CompilerGeneratedAttribute")
&& backingFieldFromGetter is null))
if (annotatedFields.Any(a => a.Field == backingField))
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{
// We failed to find the backing field of an auto-property accessor
_logger.LogWarning(property, DiagnosticId.DynamicallyAccessedMembersCouldNotFindBackingField, property.GetDisplayName());
_logger.LogWarning(backingField, DiagnosticId.DynamicallyAccessedMembersOnPropertyConflictsWithBackingField, property.GetDisplayName(), backingField.GetDisplayName());
}
else if (backingFieldFromGetter is not null && backingFieldFromSetter is not null
&& backingFieldFromSetter != backingFieldFromGetter)
else if (backingFieldFromGetter is not null
&& backingFieldFromSetter is not null
&& backingFieldFromGetter != backingFieldFromSetter)
{
// We found two different backing fields for the getter and the setter
_logger.LogWarning(property, DiagnosticId.DynamicallyAccessedMembersCouldNotFindBackingField, property.GetDisplayName());
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}
else
{
// We either have a single auto-property accessor or both accessors point to the same backing field
backingField = backingFieldFromSetter ?? backingFieldFromGetter;
}

if (backingField != null)
{
if (annotatedFields.Any(a => a.Field == backingField))
{
_logger.LogWarning(backingField, DiagnosticId.DynamicallyAccessedMembersOnPropertyConflictsWithBackingField, property.GetDisplayName(), backingField.GetDisplayName());
}
else
{
annotatedFields.Add(new FieldAnnotation(backingField, annotation));
}
annotatedFields.Add(new FieldAnnotation(backingField, annotation));
}
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}
}
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6 changes: 3 additions & 3 deletions src/tools/illink/src/ILLink.RoslynAnalyzer/TrimAnalysis/FlowAnnotations.cs
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Expand Up @@ -117,11 +117,11 @@ internal static DynamicallyAccessedMemberTypes GetFieldAnnotation(IFieldSymbol f
if (!field.OriginalDefinition.Type.IsTypeInterestingForDataflow(isByRef: field.RefKind is not RefKind.None))
return DynamicallyAccessedMemberTypes.None;

if (field.AssociatedSymbol is IPropertySymbol property)
if (field.AssociatedSymbol is IPropertySymbol property
&& property.IsAutoProperty())
{
// If this is an auto property, we get the property annotation
if (property.IsAutoProperty())
return property.GetDynamicallyAccessedMemberTypes();
return property.GetDynamicallyAccessedMemberTypes();
}

return field.GetDynamicallyAccessedMemberTypes();
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36 changes: 9 additions & 27 deletions src/tools/illink/src/linker/Linker.Dataflow/FlowAnnotations.cs
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Expand Up @@ -433,41 +433,23 @@ TypeAnnotations BuildTypeAnnotations(TypeDefinition type)
}
}

if (IsAutoProperty(property))

FieldDefinition backingField = backingFieldFromSetter ?? backingFieldFromGetter!;
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if (backingField is not null)
{
FieldDefinition? backingField = null;
// If it's an annotated auto-prop, we should be able to find the compiler generated field
if ((property.SetMethod is not null
&& property.SetMethod.IsCompilerGenerated()
&& backingFieldFromSetter is null)
|| (property.GetMethod is not null
&& property.GetMethod.IsCompilerGenerated()
&& backingFieldFromGetter is null))
if (annotatedFields.Any(a => a.Field == backingField))
{
// We failed to find the backing field of an auto-property accessor
_context.LogWarning(property, DiagnosticId.DynamicallyAccessedMembersCouldNotFindBackingField, property.GetDisplayName());
_context.LogWarning(backingField, DiagnosticId.DynamicallyAccessedMembersOnPropertyConflictsWithBackingField, property.GetDisplayName(), backingField.GetDisplayName());
}
else if (backingFieldFromGetter is not null && backingFieldFromSetter is not null
&& backingFieldFromSetter != backingFieldFromGetter)
else if (backingFieldFromGetter is not null
&& backingFieldFromSetter is not null
&& backingFieldFromGetter != backingFieldFromSetter)
{
// We found two different backing fields for the getter and the setter
_context.LogWarning(property, DiagnosticId.DynamicallyAccessedMembersCouldNotFindBackingField, property.GetDisplayName());
}
else
{
// We either have a single auto-property accessor or both accessors point to the same backing field
backingField = backingFieldFromSetter ?? backingFieldFromGetter;
}
if (backingField != null)
{
if (annotatedFields.Any(a => a.Field == backingField))
{
_context.LogWarning(backingField, DiagnosticId.DynamicallyAccessedMembersOnPropertyConflictsWithBackingField, property.GetDisplayName(), backingField.GetDisplayName());
}
else
{
annotatedFields.Add(new FieldAnnotation(backingField, annotation));
}
annotatedFields.Add(new FieldAnnotation(backingField, annotation));
}
}
}
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8 changes: 0 additions & 8 deletions src/tools/illink/test/Mono.Linker.Tests.Cases/DataFlow/PropertyDataFlow.cs
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Expand Up @@ -959,7 +959,6 @@ class AutoPropertyUnrecognizedField
private Type Property_BackingField;

[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
[ExpectedWarning("IL2042", Tool.NativeAot | Tool.Trimmer, "Requires IL")] // Can't find backing field
public Type Property
{
[CompilerGenerated]
Expand All @@ -980,7 +979,6 @@ public Type Property
}

[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
[ExpectedWarning("IL2042", Tool.NativeAot | Tool.Trimmer, "Requires IL")] // Can't find backing field
public Type PropertyAutoSet
{
[CompilerGenerated]
Expand All @@ -995,10 +993,8 @@ public Type PropertyAutoSet
}

[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
[ExpectedWarning("IL2042", Tool.NativeAot | Tool.Trimmer, "Requires IL")] // Can't find backing field
public Type PropertyAutoGet
{
[ExpectedWarning("IL2078", ["return value", nameof(PropertyAutoGet), "BackingField"], producedBy: Tool.NativeAot | Tool.Trimmer, "Requires IL")]
get;
[CompilerGenerated]
set
Expand All @@ -1010,7 +1006,6 @@ public Type PropertyAutoGet
}

[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
[ExpectedWarning("IL2042", Tool.NativeAot | Tool.Trimmer, "Requires IL")] // Can't find backing field
public Type PropertyManualSet
{
[CompilerGenerated]
Expand All @@ -1025,7 +1020,6 @@ public Type PropertyManualSet
}

[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
[ExpectedWarning("IL2042", Tool.NativeAot | Tool.Trimmer, "Requires IL")] // Can't find backing field
public Type PropertyManualGet
{
[ExpectedWarning("IL2078", "return value", nameof(Property_BackingField))]
Expand All @@ -1040,7 +1034,6 @@ public Type PropertyManualGet
}

[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
[ExpectedWarning("IL2042", Tool.NativeAot | Tool.Trimmer, "Requires IL")] // Can't find backing field
public Type PropertyOnlyGet
{
[CompilerGenerated]
Expand All @@ -1054,7 +1047,6 @@ public Type PropertyOnlyGet
}

[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
[ExpectedWarning("IL2042", nameof(PropertyOnlySet), Tool.NativeAot | Tool.Trimmer, "Requires IL")] // Can't find backing field
public Type PropertyOnlySet
{
[CompilerGenerated]
Expand Down
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