private static void ValidateImmutability(
SyntaxNodeAnalysisContext context,
ITypeSymbol typeSymbol
)
{
if (ImmutableContainerMethods.IsAnImmutableContainerType(typeSymbol))
{
var namedTypeSymbol = typeSymbol as INamedTypeSymbol;
if (namedTypeSymbol == default(INamedTypeSymbol))
{
context.ReportDiagnostic(Diagnostic.Create(
Diagnostics.GenericArgumentTypeMustBeImmutable,
context.Node.GetLocation(),
messageArgs: new object[] { namedTypeSymbol.Name }));
}
foreach (var typeArgument in namedTypeSymbol.TypeArguments)
{
ValidateImmutability(context, typeArgument);
}
}
else
{
if ((!KnownImmutableTypes.IsTypeKnownImmutable(typeSymbol)) &&
(typeSymbol.GetImmutabilityScope() != ImmutabilityScope.SelfAndChildren))
{
context.ReportDiagnostic(Diagnostic.Create(
Diagnostics.GenericArgumentTypeMustBeImmutable,
context.Node.GetLocation(),
messageArgs: new object[] { typeSymbol.Name }));
}
}
}
internal MutabilityInspector(
Compilation compilation,
KnownImmutableTypes knownImmutableTypes
)
{
m_compilation = compilation;
m_knownImmutableTypes = knownImmutableTypes;
}
public void IsTypeKnownImmutable_NotDeclaredImmutableAndNotDefault_False()
{
var knownTypes = new KnownImmutableTypes(ImmutableHashSet <string> .Empty);
var type = Field("System.IDisposable foo").Symbol.Type;
var result = knownTypes.IsTypeKnownImmutable(type);
Assert.False(result);
}
public void IsTypeKnownImmutable_DefaultlyImmutable_True()
{
var knownTypes = new KnownImmutableTypes(ImmutableHashSet <string> .Empty);
var type = Field("System.Version foo").Symbol.Type;
var result = knownTypes.IsTypeKnownImmutable(type);
Assert.True(result);
}
public void IsTypeKnownImmutable_DeclaredImmutable_True()
{
var knownTypes = new KnownImmutableTypes(new HashSet <string> {
"System.IDisposable"
}.ToImmutableHashSet());
var type = Field("System.IDisposable foo").Symbol.Type;
var result = knownTypes.IsTypeKnownImmutable(type);
Assert.True(result);
}
public void IsTypeKnownImmutable_AssemblyDeclaredImmutable_True()
{
var cs = @"
using System;
using D2L.CodeStyle.Annotations;
[assembly: Types.Audited( typeof( Test.Foo ), ""Random Owner"", ""Random Date"", ""Random rationale"" )]
namespace Test {
public class Foo { }
}
namespace D2L.CodeStyle.Annotations {
public static partial class Types {
[AttributeUsage( validOn: AttributeTargets.Assembly, AllowMultiple = true )]
public sealed class Audited : Attribute {
public Audited( Type type, string owner, string auditedDate, string rationale ) {
Type = type;
Owner = owner;
AuditedDate = auditedDate;
Rationale = rationale;
}
public Type Type { get; }
public string Owner { get; }
public string AuditedDate { get; }
public string Rationale { get; }
}
}
}
";
var compilation = Compile(cs);
var knownTypes = new KnownImmutableTypes(compilation.Assembly);
var fooType = compilation.GetSymbolsWithName(
predicate: n => true,
filter: SymbolFilter.Type
).OfType <ITypeSymbol>().FirstOrDefault();
Assert.IsNotNull(fooType);
Assert.AreNotEqual(TypeKind.Error, fooType.TypeKind);
var result = knownTypes.IsTypeKnownImmutable(fooType);
Assert.True(result);
}