/// <summary>
/// Checks if an applied attribute with the given attributeType matches the namespace name and type name of the given early attribute's description
/// and the attribute description has a signature with parameter count equal to the given attribute syntax's argument list count.
/// NOTE: We don't allow early decoded attributes to have optional parameters.
/// </summary>
internal static bool IsTargetEarlyAttribute(NamedTypeSymbol attributeType, AttributeSyntax attributeSyntax, AttributeDescription description)
{
Debug.Assert(!attributeType.IsErrorType());
int argumentCount = (attributeSyntax.ArgumentList != null) ?
attributeSyntax.ArgumentList.Arguments.Count((arg) => arg.NameEquals == null) :
0;
return(AttributeData.IsTargetEarlyAttribute(attributeType, argumentCount, description));
}
protected SubstitutedNamedTypeSymbol(Symbol newContainer, TypeMap map, NamedTypeSymbol originalDefinition, NamedTypeSymbol constructedFrom = null, bool unbound = false)
: base(originalDefinition)
{
Debug.Assert(originalDefinition.IsDefinition);
Debug.Assert(!originalDefinition.IsErrorType());
_newContainer = newContainer;
_inputMap = map;
_unbound = unbound;
// if we're substituting to create a new unconstructed type as a member of a constructed type,
// then we must alpha rename the type parameters.
if ((object)constructedFrom != null)
{
Debug.Assert(ReferenceEquals(constructedFrom.ConstructedFrom, constructedFrom));
_lazyTypeParameters = constructedFrom.TypeParameters;
_lazyMap = map;
}
}
/// <summary>
/// Lookup member declaration in predefined CorLib type in this Assembly. Only valid if this
/// assembly is the Cor Library
/// </summary>
internal override Symbol GetDeclaredSpecialTypeMember(SpecialMember member)
{
#if DEBUG
foreach (var module in this.Modules)
{
Debug.Assert(module.GetReferencedAssemblies().Length == 0);
}
#endif
if (_lazySpecialTypeMembers == null || ReferenceEquals(_lazySpecialTypeMembers[(int)member], ErrorTypeSymbol.UnknownResultType))
{
if (_lazySpecialTypeMembers == null)
{
var specialTypeMembers = new Symbol[(int)SpecialMember.Count];
for (int i = 0; i < specialTypeMembers.Length; i++)
{
specialTypeMembers[i] = ErrorTypeSymbol.UnknownResultType;
}
Interlocked.CompareExchange(ref _lazySpecialTypeMembers, specialTypeMembers, null);
}
var descriptor = SpecialMembers.GetDescriptor(member);
NamedTypeSymbol type = GetDeclaredSpecialType((SpecialType)descriptor.DeclaringTypeId);
Symbol result = null;
if (!type.IsErrorType())
{
result = CSharpCompilation.GetRuntimeMember(type, ref descriptor, CSharpCompilation.SpecialMembersSignatureComparer.Instance, accessWithinOpt: null);
}
Interlocked.CompareExchange(ref _lazySpecialTypeMembers[(int)member], result, ErrorTypeSymbol.UnknownResultType);
}
return(_lazySpecialTypeMembers[(int)member]);
}
/// <summary>
/// Resolves <see cref="System.Type"/> to a <see cref="TypeSymbol"/> available in this assembly
/// its referenced assemblies.
/// </summary>
/// <param name="type">The type to resolve.</param>
/// <param name="includeReferences">Use referenced assemblies for resolution.</param>
/// <returns>The resolved symbol if successful or null on failure.</returns>
internal TypeSymbol GetTypeByReflectionType(Type type, bool includeReferences)
{
System.Reflection.TypeInfo typeInfo = type.GetTypeInfo();
Debug.Assert(!typeInfo.IsByRef);
// not supported (we don't accept open types as submission results nor host types):
Debug.Assert(!typeInfo.ContainsGenericParameters);
if (typeInfo.IsArray)
{
TypeSymbol symbol = GetTypeByReflectionType(typeInfo.GetElementType(), includeReferences);
if ((object)symbol == null)
{
return(null);
}
int rank = typeInfo.GetArrayRank();
if (rank != 1)
{
throw new NotSupportedException($"An array of rank {rank} is not supported in stark via reflection");
}
return(ArrayTypeSymbol.CreateArray(this, TypeSymbolWithAnnotations.Create(symbol)));
}
else if (typeInfo.IsPointer)
{
TypeSymbol symbol = GetTypeByReflectionType(typeInfo.GetElementType(), includeReferences);
if ((object)symbol == null)
{
return(null);
}
return(new PointerTypeSymbol(TypeSymbolWithAnnotations.Create(symbol)));
}
else if (typeInfo.DeclaringType != null)
{
Debug.Assert(!typeInfo.IsArray);
// consolidated generic arguments (includes arguments of all declaring types):
Type[] genericArguments = typeInfo.GenericTypeArguments;
int typeArgumentIndex = 0;
var currentTypeInfo = typeInfo.IsGenericType ? typeInfo.GetGenericTypeDefinition().GetTypeInfo() : typeInfo;
var nestedTypes = ArrayBuilder <System.Reflection.TypeInfo> .GetInstance();
while (true)
{
Debug.Assert(currentTypeInfo.IsGenericTypeDefinition || !currentTypeInfo.IsGenericType);
nestedTypes.Add(currentTypeInfo);
if (currentTypeInfo.DeclaringType == null)
{
break;
}
currentTypeInfo = currentTypeInfo.DeclaringType.GetTypeInfo();
}
int i = nestedTypes.Count - 1;
var symbol = (NamedTypeSymbol)GetTypeByReflectionType(nestedTypes[i].AsType(), includeReferences);
if ((object)symbol == null)
{
return(null);
}
while (--i >= 0)
{
int forcedArity = nestedTypes[i].GenericTypeParameters.Length - nestedTypes[i + 1].GenericTypeParameters.Length;
MetadataTypeName mdName = MetadataTypeName.FromTypeName(nestedTypes[i].Name, forcedArity: forcedArity);
symbol = symbol.LookupMetadataType(ref mdName);
if ((object)symbol == null || symbol.IsErrorType())
{
return(null);
}
symbol = ApplyGenericArguments(symbol, genericArguments, ref typeArgumentIndex, includeReferences);
if ((object)symbol == null)
{
return(null);
}
}
nestedTypes.Free();
Debug.Assert(typeArgumentIndex == genericArguments.Length);
return(symbol);
}
else
{
AssemblyIdentity assemblyId = AssemblyIdentity.FromAssemblyDefinition(typeInfo.Assembly);
MetadataTypeName mdName = MetadataTypeName.FromNamespaceAndTypeName(
typeInfo.Namespace ?? string.Empty,
typeInfo.Name,
forcedArity: typeInfo.GenericTypeArguments.Length);
NamedTypeSymbol symbol = GetTopLevelTypeByMetadataName(ref mdName, assemblyId, includeReferences, isWellKnownType: false, conflicts: out var _);
if ((object)symbol == null || symbol.IsErrorType())
{
return(null);
}
int typeArgumentIndex = 0;
Type[] genericArguments = typeInfo.GenericTypeArguments;
symbol = ApplyGenericArguments(symbol, genericArguments, ref typeArgumentIndex, includeReferences);
Debug.Assert(typeArgumentIndex == genericArguments.Length);
return(symbol);
}
}
/// <summary>
/// Lookup a top level type referenced from metadata, names should be
/// compared case-sensitively. Detect cycles during lookup.
/// </summary>
/// <param name="emittedName">
/// Full type name, possibly with generic name mangling.
/// </param>
/// <param name="visitedAssemblies">
/// List of assemblies lookup has already visited (since type forwarding can introduce cycles).
/// </param>
/// <param name="digThroughForwardedTypes">
/// Take forwarded types into account.
/// </param>
internal sealed override NamedTypeSymbol LookupTopLevelMetadataTypeWithCycleDetection(ref MetadataTypeName emittedName, ConsList <AssemblySymbol> visitedAssemblies, bool digThroughForwardedTypes)
{
NamedTypeSymbol result = null;
// This is a cache similar to the one used by MetaImport::GetTypeByName in native
// compiler. The difference is that native compiler pre-populates the cache when it
// loads types. Here we are populating the cache only with things we looked for, so that
// next time we are looking for the same thing, the lookup is fast. This cache also
// takes care of TypeForwarders. Gives about 8% win on subsequent lookups in some
// scenarios.
//
// CONSIDER !!!
//
// However, it is questionable how often subsequent lookup by name is going to happen.
// Currently it doesn't happen for TypeDef tokens at all, for TypeRef tokens, the
// lookup by name is done once and the result is cached. So, multiple lookups by name
// for the same type are going to happen only in these cases:
// 1) Resolving GetType() in attribute application, type is encoded by name.
// 2) TypeRef token isn't reused within the same module, i.e. multiple TypeRefs point to
// the same type.
// 3) Different Module refers to the same type, lookup once per Module (with exception of #2).
// 4) Multitargeting - retargeting the type to a different version of assembly
result = LookupTopLevelMetadataTypeInCache(ref emittedName);
if ((object)result != null)
{
// We only cache result equivalent to digging through type forwarders, which
// might produce an forwarder specific ErrorTypeSymbol. We don't want to
// return that error symbol, unless digThroughForwardedTypes is true.
if (digThroughForwardedTypes || (!result.IsErrorType() && (object)result.ContainingAssembly == (object)this))
{
return(result);
}
// According to the cache, the type wasn't found, or isn't declared in this assembly (forwarded).
return(new MissingMetadataTypeSymbol.TopLevel(this.Modules[0], ref emittedName));
}
else
{
// Now we will look for the type in each module of the assembly and pick the first type
// we find, this is what native VB compiler does.
var modules = this.Modules;
var count = modules.Length;
var i = 0;
result = modules[i].LookupTopLevelMetadataType(ref emittedName);
if (result is MissingMetadataTypeSymbol)
{
for (i = 1; i < count; i++)
{
var newResult = modules[i].LookupTopLevelMetadataType(ref emittedName);
// Hold on to the first missing type result, unless we found the type.
if (!(newResult is MissingMetadataTypeSymbol))
{
result = newResult;
break;
}
}
}
bool foundMatchInThisAssembly = (i < count);
Debug.Assert(!foundMatchInThisAssembly || (object)result.ContainingAssembly == (object)this);
if (!foundMatchInThisAssembly && digThroughForwardedTypes)
{
// We didn't find the type
System.Diagnostics.Debug.Assert(result is MissingMetadataTypeSymbol);
NamedTypeSymbol forwarded = TryLookupForwardedMetadataTypeWithCycleDetection(ref emittedName, visitedAssemblies);
if ((object)forwarded != null)
{
result = forwarded;
}
}
System.Diagnostics.Debug.Assert((object)result != null);
// Add result of the lookup into the cache
if (digThroughForwardedTypes || foundMatchInThisAssembly)
{
CacheTopLevelMetadataType(ref emittedName, result);
}
return(result);
}
}
