/// <param name="sourceType">Type that already has custom modifiers.</param>
/// <param name="destinationType">Same as <paramref name="sourceType"/>, but without custom modifiers. May differ in object/dynamic.</param>
/// <param name="containingAssembly">The assembly containing the signature referring to the destination type.</param>
/// <returns><paramref name="destinationType"/> with custom modifiers copied from <paramref name="sourceType"/>.</returns>
internal static TypeSymbol CopyTypeCustomModifiers(TypeSymbol sourceType, TypeSymbol destinationType, AssemblySymbol containingAssembly)
{
Debug.Assert(sourceType.Equals(destinationType, TypeCompareKind.AllIgnoreOptions));
const RefKind refKind = RefKind.None;
// NOTE: overrides can differ by object/dynamic. If they do, we'll need to tweak newType before
// we can use it in place of this.Type. We do so by computing the dynamic transform flags that
// code gen uses and then passing them to the dynamic type decoder that metadata reading uses.
// NOTE: ref is irrelevant here since we are just encoding/decoding the type out of the signature context
TypeSymbol typeWithDynamic = sourceType;
TypeSymbol resultType;
if (destinationType.ContainsTuple() && !sourceType.Equals(destinationType, TypeCompareKind.IgnoreCustomModifiersAndArraySizesAndLowerBounds | TypeCompareKind.IgnoreNullableModifiersForReferenceTypes | TypeCompareKind.IgnoreDynamic))
{
// We also preserve tuple names, if present and different
ImmutableArray <string> names = CSharpCompilation.TupleNamesEncoder.Encode(destinationType);
resultType = TupleTypeDecoder.DecodeTupleTypesIfApplicable(typeWithDynamic, names);
}
else
{
resultType = typeWithDynamic;
}
// Preserve nullable modifiers as well.
// https://github.com/dotnet/roslyn/issues/30077: Is it reasonable to copy annotations from the source?
// If the destination had some of those annotations but not all, then clearly the destination
// was incorrect. Or if the destination is C#7, then the destination will advertise annotations
// that the author did not write and did not validate.
var flagsBuilder = ArrayBuilder <byte> .GetInstance();
destinationType.AddNullableTransforms(flagsBuilder);
int position = 0;
int length = flagsBuilder.Count;
bool transformResult = resultType.ApplyNullableTransforms(defaultTransformFlag: 0, flagsBuilder.ToImmutableAndFree(), ref position, out resultType);
Debug.Assert(transformResult && position == length);
Debug.Assert(resultType.Equals(sourceType, TypeCompareKind.IgnoreDynamicAndTupleNames | TypeCompareKind.IgnoreNullableModifiersForReferenceTypes)); // Same custom modifiers as source type.
Debug.Assert(resultType.Equals(destinationType,
TypeCompareKind.IgnoreCustomModifiersAndArraySizesAndLowerBounds | TypeCompareKind.IgnoreNullableModifiersForReferenceTypes)); // Same object/dynamic and tuple names as destination type.
return(resultType);
}
internal override bool AreInternalsVisibleToThisAssembly(AssemblySymbol other)
{
return(false);
}
/// <summary>
/// Create a NamespaceExtent that represents a given AssemblySymbol.
/// </summary>
internal NamespaceExtent(AssemblySymbol assembly)
{
_kind = NamespaceKind.Assembly;
_symbolOrCompilation = assembly;
}
internal static ArrayTypeSymbol CreateSZArray(
AssemblySymbol declaringAssembly,
TypeSymbolWithAnnotations elementType)
{
return(CreateSZArray(elementType, declaringAssembly.GetSpecialType(SpecialType.System_Array), GetSZArrayInterfaces(elementType, declaringAssembly)));
}
protected static void CopyEventCustomModifiers(EventSymbol eventWithCustomModifiers, ref TypeSymbolWithAnnotations type, AssemblySymbol containingAssembly)
{
Debug.Assert((object)eventWithCustomModifiers != null);
TypeSymbol overriddenEventType = eventWithCustomModifiers.Type.TypeSymbol;
// We do an extra check before copying the type to handle the case where the overriding
// event (incorrectly) has a different type than the overridden event. In such cases,
// we want to retain the original (incorrect) type to avoid hiding the type given in source.
if (type.TypeSymbol.Equals(overriddenEventType, TypeCompareKind.IgnoreCustomModifiersAndArraySizesAndLowerBounds | TypeCompareKind.IgnoreNullableModifiersForReferenceTypes | TypeCompareKind.IgnoreDynamic))
{
type = type.WithTypeAndModifiers(CustomModifierUtils.CopyTypeCustomModifiers(overriddenEventType, type.TypeSymbol, containingAssembly),
eventWithCustomModifiers.Type.CustomModifiers);
}
}
internal NamedTypeSymbol GetTopLevelTypeByMetadataName(
ref MetadataTypeName metadataName,
AssemblyIdentity assemblyOpt,
bool includeReferences,
bool isWellKnownType,
out (AssemblySymbol, AssemblySymbol) conflicts,
DiagnosticBag warnings = null,
bool ignoreCorLibraryDuplicatedTypes = false)
{
conflicts = default;
NamedTypeSymbol result;
// First try this assembly
result = GetTopLevelTypeByMetadataName(this, ref metadataName, assemblyOpt);
if (isWellKnownType && !IsValidWellKnownType(result))
{
result = null;
}
// ignore any types of the same name that might be in referenced assemblies (prefer the current assembly):
if ((object)result != null || !includeReferences)
{
return(result);
}
Debug.Assert(this is SourceAssemblySymbol,
"Never include references for a non-source assembly, because they don't know about aliases.");
var assemblies = ArrayBuilder <AssemblySymbol> .GetInstance();
// ignore reference aliases if searching for a type from a specific assembly:
if (assemblyOpt != null)
{
assemblies.AddRange(DeclaringCompilation.GetBoundReferenceManager().ReferencedAssemblies);
}
else
{
DeclaringCompilation.GetUnaliasedReferencedAssemblies(assemblies);
}
// Lookup in references
foreach (var assembly in assemblies)
{
Debug.Assert(!(this is SourceAssemblySymbol && assembly.IsMissing)); // Non-source assemblies can have missing references
NamedTypeSymbol candidate = GetTopLevelTypeByMetadataName(assembly, ref metadataName, assemblyOpt);
if (isWellKnownType && !IsValidWellKnownType(candidate))
{
candidate = null;
}
if ((object)candidate == null)
{
continue;
}
if (candidate.IsHiddenByCodeAnalysisEmbeddedAttribute())
{
continue;
}
Debug.Assert(!TypeSymbol.Equals(candidate, result, TypeCompareKind.ConsiderEverything2));
if ((object)result != null)
{
// duplicate
if (ignoreCorLibraryDuplicatedTypes)
{
if (IsInCorLib(candidate))
{
// ignore candidate
continue;
}
if (IsInCorLib(result))
{
// drop previous result
result = candidate;
continue;
}
}
if (warnings == null)
{
conflicts = (result.ContainingAssembly, candidate.ContainingAssembly);
result = null;
}
else
{
// The predefined type '{0}' is defined in multiple assemblies in the global alias; using definition from '{1}'
warnings.Add(ErrorCode.WRN_MultiplePredefTypes, NoLocation.Singleton, result, result.ContainingAssembly);
}
break;
}
result = candidate;
}
assemblies.Free();
return(result);
}
/// <summary>
/// A helper method for ReferenceManager to set the system assembly, which provides primitive
/// types like Object, String, etc., e.g. mscorlib.dll.
/// </summary>
internal void SetCorLibrary(AssemblySymbol corLibrary)
{
Debug.Assert((object)_corLibrary == null);
_corLibrary = corLibrary;
}
internal abstract bool AreInternalsVisibleToThisAssembly(AssemblySymbol other);
internal ErrorTypeSymbol CreateMultipleForwardingErrorTypeSymbol(ref MetadataTypeName emittedName, ModuleSymbol forwardingModule, AssemblySymbol destination1, AssemblySymbol destination2)
{
var diagnosticInfo = new CSDiagnosticInfo(ErrorCode.ERR_TypeForwardedToMultipleAssemblies, forwardingModule, this, emittedName.FullName, destination1, destination2);
return(new MissingMetadataTypeSymbol.TopLevelWithCustomErrorInfo(forwardingModule, ref emittedName, diagnosticInfo));
}
