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Fix: Using TypeBuilder as generic argument for a parent type throws #99771

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Merged
merged 4 commits into from
Mar 18, 2024
Merged

Fix: Using TypeBuilder as generic argument for a parent type throws #99771

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f27478c
Fix: Using TypeBuilder as generic argument for a parent type throws
buyaa-n Mar 14, 2024
387a7c6
No need to branch out for constructed generic parent
buyaa-n Mar 15, 2024
056f985
Merge branch 'main' into ctor-bug
buyaa-n Mar 15, 2024
94991f0
Update method name
buyaa-n Mar 15, 2024
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16 changes: 8 additions & 8 deletions src/libraries/System.Reflection.Emit/src/System/Reflection/Emit/ModuleBuilderImpl.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -609,7 +609,7 @@ private static MemberInfo GetOriginalMemberIfConstructedType(MethodBase methodBa
Type declaringType = methodBase.DeclaringType!;
if (declaringType.IsConstructedGenericType &&
declaringType.GetGenericTypeDefinition() is not TypeBuilderImpl &&
!ContainsNotBakedTypeBuilder(declaringType.GetGenericArguments()))
!ContainsTypeBuilder(declaringType.GetGenericArguments()))
{
return declaringType.GetGenericTypeDefinition().GetMemberWithSameMetadataDefinitionAs(methodBase);
}
Expand Down Expand Up @@ -883,19 +883,19 @@ private static int GetTokenForHandle(EntityHandle handle)

private EntityHandle GetHandleForMember(MemberInfo member)
{
if (IsConstructedFromNotBakedTypeBuilder(member.DeclaringType!))
if (IsConstructedFromTypeBuilder(member.DeclaringType!))
{
return default;
}

return GetMemberReferenceHandle(member);
}

private static bool IsConstructedFromNotBakedTypeBuilder(Type type) => type.IsConstructedGenericType &&
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@buyaa-n buyaa-n Mar 14, 2024 •
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These methods initially used for checking if constructed from a not baked TypeBuilder, but now the check for not baked part is removed and its used for all cases no matter if the TypeBuilder was baked or not

private static bool IsConstructedFromTypeBuilder(Type type) => type.IsConstructedGenericType &&
(type.GetGenericTypeDefinition() is TypeBuilderImpl ||
ContainsNotBakedTypeBuilder(type.GetGenericArguments()));
ContainsTypeBuilder(type.GetGenericArguments()));

private static bool ContainsNotBakedTypeBuilder(Type[] genericArguments)
internal static bool ContainsTypeBuilder(Type[] genericArguments)
{
foreach (Type type in genericArguments)
{
Expand All @@ -904,7 +904,7 @@ private static bool ContainsNotBakedTypeBuilder(Type[] genericArguments)
return true;
}

if (IsConstructedFromNotBakedTypeBuilder(type))
if (IsConstructedFromTypeBuilder(type))
{
return true;
}
Expand All @@ -925,7 +925,7 @@ internal EntityHandle TryGetTypeHandle(Type type)
return eb._typeBuilder._handle;
}

if (IsConstructedFromNotBakedTypeBuilder(type))
if (IsConstructedFromTypeBuilder(type))
{
return default;
}
Expand Down Expand Up @@ -967,7 +967,7 @@ private static bool IsArrayMethodFromNotBakedTypeBuilder(MethodInfo method) => m
arrayMethod.DeclaringType!.GetElementType() is TypeBuilderImpl tb && tb._handle == default;

private static bool IsConstructedMethodFromNotBakedMethodBuilder(MethodInfo method) => method.IsConstructedGenericMethod &&
(method.GetGenericMethodDefinition() is MethodBuilderImpl mb && mb._handle == default || ContainsNotBakedTypeBuilder(method.GetGenericArguments()));
(method.GetGenericMethodDefinition() is MethodBuilderImpl mb && mb._handle == default || ContainsTypeBuilder(method.GetGenericArguments()));

internal EntityHandle TryGetMethodHandle(MethodInfo method, Type[] optionalParameterTypes)
{
Expand Down
6 changes: 4 additions & 2 deletions src/libraries/System.Reflection.Emit/src/System/Reflection/Emit/TypeBuilderImpl.cs
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Expand Up @@ -211,9 +211,11 @@ private ConstructorBuilderImpl DefineDefaultConstructorInternal(MethodAttributes
{
// Get the parent class's default constructor and add it to the IL
ConstructorInfo? con;
if (_typeParent!.IsConstructedGenericType && _typeParent.GetGenericTypeDefinition() is TypeBuilderImpl typeBuilder)
if (_typeParent!.IsConstructedGenericType &&
(_typeParent.GetGenericTypeDefinition() is TypeBuilderImpl || ModuleBuilderImpl.ContainsTypeBuilder(_typeParent.GetGenericArguments())))
{
con = GetConstructor(_typeParent, typeBuilder.GetConstructor(
// When TypeBuilder involved need to construct the parent constructor using TypeBuilder.GetConstructor() static method
con = GetConstructor(_typeParent, _typeParent.GetGenericTypeDefinition().GetConstructor(
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, EmptyTypes, null)!);
}
else
Expand Down
17 changes: 17 additions & 0 deletions ...ies/System.Reflection.Emit/tests/PersistedAssemblyBuilder/AssemblySaveTypeBuilderTests.cs
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Expand Up @@ -649,6 +649,23 @@ public void MethodBuilderGetParametersReturnParameterTest()
Assert.Null(method3.ReturnParameter.Name);
Assert.True(method3.ReturnParameter.IsRetval);
}

public class BaseType<T> { }

[Fact]
public void GenericTypeWithTypeBuilderGenericParameter_UsedAsParent()
{
PersistedAssemblyBuilder ab = AssemblySaveTools.PopulateAssemblyBuilderAndTypeBuilder(out TypeBuilder typeBuilder);

Type type = typeBuilder.CreateType();
var baseType = typeof(BaseType<>).GetGenericTypeDefinition().MakeGenericType(type);

var typeBuilder2 = ab.GetDynamicModule("MyModule")
.DefineType("TestService", TypeAttributes.Public | TypeAttributes.Class, baseType);
typeBuilder2.CreateType();

Assert.NotNull(type.GetConstructor(Type.EmptyTypes)); // Default constructor created
}
}

// Test Types
Expand Down