Simplify HasAccessibleTypeWithMetadataName

src/ComputeSharp.SourceGeneration/Extensions/CompilationExtensions.cs

@@ -69,41 +69,18 @@ public static bool TryBuildNamedTypeSymbolSet(
     /// <returns>Whether a type with the specified metadata name can be accessed from the given compilation.</returns>
     public static bool HasAccessibleTypeWithMetadataName(this Compilation compilation, string fullyQualifiedMetadataName)
     {
-        // Try to get the unique type with this name
-        INamedTypeSymbol? type = compilation.GetTypeByMetadataName(fullyQualifiedMetadataName);
-
         // If there is only a single matching symbol, check its accessibility
-        if (type is not null)
-        {
-            return type.CanBeAccessedFrom(compilation.Assembly);
-        }
-
-        // Otherwise, try to get the unique type with this name originally defined in 'compilation'
-        type ??= compilation.Assembly.GetTypeByMetadataName(fullyQualifiedMetadataName);
-
-        if (type is not null)
+        if (compilation.GetTypeByMetadataName(fullyQualifiedMetadataName) is INamedTypeSymbol typeSymbol)
         {
-            return type.CanBeAccessedFrom(compilation.Assembly);
+            return compilation.IsSymbolAccessibleWithin(typeSymbol, compilation.Assembly);
         }
 
-        // Otherwise, check whether the type is defined and accessible from any of the referenced assemblies
-        foreach (IModuleSymbol module in compilation.Assembly.Modules)
+        // Otherwise, check all available types
+        foreach (INamedTypeSymbol currentTypeSymbol in compilation.GetTypesByMetadataName(fullyQualifiedMetadataName))
         {
-            foreach (IAssemblySymbol referencedAssembly in module.ReferencedAssemblySymbols)
+            if (compilation.IsSymbolAccessibleWithin(currentTypeSymbol, compilation.Assembly))
             {
-                if (referencedAssembly.GetTypeByMetadataName(fullyQualifiedMetadataName) is not INamedTypeSymbol currentType)
-                {
-                    continue;
-                }
-
-                switch (currentType.GetEffectiveAccessibility())
-                {
-                    case Accessibility.Public:
-                    case Accessibility.Internal when referencedAssembly.GivesAccessTo(compilation.Assembly):
-                        return true;
-                    default:
-                        continue;
-                }
+                return true;
             }
         }
 

src/ComputeSharp.SourceGeneration/Extensions/ISymbolExtensions.cs

@@ -75,57 +75,4 @@ public static bool TryGetAttributeWithFullyQualifiedMetadataName(this ISymbol sy
 
         return false;
     }
-
-    /// <summary>
-    /// Calculates the effective accessibility for a given symbol.
-    /// </summary>
-    /// <param name="symbol">The <see cref="ISymbol"/> instance to check.</param>
-    /// <returns>The effective accessibility for <paramref name="symbol"/>.</returns>
-    public static Accessibility GetEffectiveAccessibility(this ISymbol symbol)
-    {
-        // Start by assuming it's visible
-        Accessibility visibility = Accessibility.Public;
-
-        // Handle special cases
-        switch (symbol.Kind)
-        {
-            case SymbolKind.Alias: return Accessibility.Private;
-            case SymbolKind.Parameter: return GetEffectiveAccessibility(symbol.ContainingSymbol);
-            case SymbolKind.TypeParameter: return Accessibility.Private;
-        }
-
-        // Traverse the symbol hierarchy to determine the effective accessibility
-        while (symbol is not null && symbol.Kind != SymbolKind.Namespace)
-        {
-            switch (symbol.DeclaredAccessibility)
-            {
-                case Accessibility.NotApplicable:
-                case Accessibility.Private:
-                    return Accessibility.Private;
-                case Accessibility.Internal:
-                case Accessibility.ProtectedAndInternal:
-                    visibility = Accessibility.Internal;
-                    break;
-            }
-
-            symbol = symbol.ContainingSymbol;
-        }
-
-        return visibility;
-    }
-
-    /// <summary>
-    /// Checks whether or not a given symbol can be accessed from a specified assembly.
-    /// </summary>
-    /// <param name="symbol">The input <see cref="ISymbol"/> instance to check.</param>
-    /// <param name="assembly">The assembly to check the accessibility of <paramref name="symbol"/> for.</param>
-    /// <returns>Whether <paramref name="assembly"/> can access <paramref name="symbol"/>.</returns>
-    public static bool CanBeAccessedFrom(this ISymbol symbol, IAssemblySymbol assembly)
-    {
-        Accessibility accessibility = symbol.GetEffectiveAccessibility();
-
-        return
-            accessibility == Accessibility.Public ||
-            (accessibility == Accessibility.Internal && symbol.ContainingAssembly.GivesAccessTo(assembly));
-    }
 }