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SharpDevelop/ICSharpCode.NRefactory/CSharp/Parser/mcs/import.cs

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//
// import.cs: System.Reflection conversions
//
// Authors: Marek Safar (marek.safar@gmail.com)
//
// Dual licensed under the terms of the MIT X11 or GNU GPL
//
// Copyright 2009, 2010 Novell, Inc
//
using System;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Linq;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace Mono.CSharp
{
public class ReflectionMetaImporter
{
Dictionary<Type, TypeSpec> import_cache;
Dictionary<Type, PredefinedTypeSpec> type_2_predefined;
Dictionary<Assembly, ImportedAssemblyDefinition> assembly_2_definition;
public ReflectionMetaImporter ()
{
import_cache = new Dictionary<Type, TypeSpec> (1024, ReferenceEquality<Type>.Default);
assembly_2_definition = new Dictionary<Assembly, ImportedAssemblyDefinition> (ReferenceEquality<Assembly>.Default);
IgnorePrivateMembers = true;
}
#region Properties
public ICollection<ImportedAssemblyDefinition> Assemblies {
get {
return assembly_2_definition.Values;
}
}
public bool IgnorePrivateMembers { get; set; }
#endregion
public void Initialize ()
{
// Setup mapping for predefined types
type_2_predefined = new Dictionary<Type, PredefinedTypeSpec> () {
{ typeof (object), TypeManager.object_type },
{ typeof (System.ValueType), TypeManager.value_type },
{ typeof (System.Attribute), TypeManager.attribute_type },
{ typeof (int), TypeManager.int32_type },
{ typeof (long), TypeManager.int64_type },
{ typeof (uint), TypeManager.uint32_type },
{ typeof (ulong), TypeManager.uint64_type },
{ typeof (byte), TypeManager.byte_type },
{ typeof (sbyte), TypeManager.sbyte_type },
{ typeof (short), TypeManager.short_type },
{ typeof (ushort), TypeManager.ushort_type },
{ typeof (System.Collections.IEnumerator), TypeManager.ienumerator_type },
{ typeof (System.Collections.IEnumerable), TypeManager.ienumerable_type },
{ typeof (System.IDisposable), TypeManager.idisposable_type },
{ typeof (char), TypeManager.char_type },
{ typeof (string), TypeManager.string_type },
{ typeof (float), TypeManager.float_type },
{ typeof (double), TypeManager.double_type },
{ typeof (decimal), TypeManager.decimal_type },
{ typeof (bool), TypeManager.bool_type },
{ typeof (System.IntPtr), TypeManager.intptr_type },
{ typeof (System.UIntPtr), TypeManager.uintptr_type },
{ typeof (System.MulticastDelegate), TypeManager.multicast_delegate_type },
{ typeof (System.Delegate), TypeManager.delegate_type },
{ typeof (System.Enum), TypeManager.enum_type },
{ typeof (System.Array), TypeManager.array_type },
{ typeof (void), TypeManager.void_type },
{ typeof (System.Type), TypeManager.type_type },
{ typeof (System.Exception), TypeManager.exception_type },
{ typeof (System.RuntimeFieldHandle), TypeManager.runtime_field_handle_type },
{ typeof (System.RuntimeTypeHandle), TypeManager.runtime_handle_type }
};
}
public FieldSpec CreateField (FieldInfo fi, TypeSpec declaringType)
{
Modifiers mod = 0;
var fa = fi.Attributes;
switch (fa & FieldAttributes.FieldAccessMask) {
case FieldAttributes.Public:
mod = Modifiers.PUBLIC;
break;
case FieldAttributes.Assembly:
mod = Modifiers.INTERNAL;
break;
case FieldAttributes.Family:
mod = Modifiers.PROTECTED;
break;
case FieldAttributes.FamORAssem:
mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
break;
default:
// Ignore private fields (even for error reporting) to not require extra dependencies
if (IgnorePrivateMembers || fi.IsDefined (typeof (CompilerGeneratedAttribute), false))
return null;
mod = Modifiers.PRIVATE;
break;
}
var definition = new ImportedMemberDefinition (fi);
TypeSpec field_type;
try {
field_type = ImportType (fi.FieldType, fi, 0);
} catch (Exception e) {
// TODO: I should construct fake TypeSpec based on TypeRef signature
// but there is no way to do it with System.Reflection
throw new InternalErrorException (e, "Cannot import field `{0}.{1}' referenced in assembly `{2}'",
declaringType.GetSignatureForError (), fi.Name, declaringType.MemberDefinition.DeclaringAssembly);
}
if ((fa & FieldAttributes.Literal) != 0) {
var c = Constant.CreateConstantFromValue (field_type, fi.GetValue (fi), Location.Null);
return new ConstSpec (declaringType, definition, field_type, fi, mod, c);
}
if ((fa & FieldAttributes.InitOnly) != 0) {
if (field_type == TypeManager.decimal_type) {
var dc = ReadDecimalConstant (fi);
if (dc != null)
return new ConstSpec (declaringType, definition, field_type, fi, mod, dc);
}
mod |= Modifiers.READONLY;
} else {
var reqs = fi.GetRequiredCustomModifiers ();
if (reqs.Length > 0) {
foreach (Type t in reqs) {
if (t == typeof (System.Runtime.CompilerServices.IsVolatile)) {
mod |= Modifiers.VOLATILE;
break;
}
}
}
}
if ((fa & FieldAttributes.Static) != 0)
mod |= Modifiers.STATIC;
if (field_type.IsStruct) {
if (fi.IsDefined (typeof (FixedBufferAttribute), false)) {
var element_field = CreateField (fi.FieldType.GetField (FixedField.FixedElementName), declaringType);
return new FixedFieldSpec (declaringType, definition, fi, element_field, mod);
}
}
return new FieldSpec (declaringType, definition, field_type, fi, mod);
}
public EventSpec CreateEvent (EventInfo ei, TypeSpec declaringType, MethodSpec add, MethodSpec remove)
{
add.IsAccessor = true;
remove.IsAccessor = true;
if (add.Modifiers != remove.Modifiers)
throw new NotImplementedException ("Different accessor modifiers " + ei.Name);
var definition = new ImportedMemberDefinition (ei);
return new EventSpec (declaringType, definition, ImportType (ei.EventHandlerType, ei, 0), add.Modifiers, add, remove);
}
T[] CreateGenericParameters<T> (Type type, TypeSpec declaringType) where T : TypeSpec
{
Type[] tparams = type.GetGenericArguments ();
int parent_owned_count;
if (type.IsNested) {
parent_owned_count = type.DeclaringType.GetGenericArguments ().Length;
//
// System.Reflection duplicates parent type parameters for each
// nested type with slightly modified properties (eg. different owner)
// This just makes things more complicated (think of cloned constraints)
// therefore we remap any nested type owned by parent using `type_cache'
// to the single TypeParameterSpec
//
if (declaringType != null && parent_owned_count > 0) {
int read_count = 0;
while (read_count != parent_owned_count) {
var tparams_count = declaringType.Arity;
if (tparams_count != 0) {
var parent_tp = declaringType.MemberDefinition.TypeParameters;
read_count += tparams_count;
for (int i = 0; i < tparams_count; i++) {
import_cache.Add (tparams[parent_owned_count - read_count + i], parent_tp[i]);
}
}
declaringType = declaringType.DeclaringType;
}
}
} else {
parent_owned_count = 0;
}
if (tparams.Length - parent_owned_count == 0)
return null;
return CreateGenericParameters<T> (parent_owned_count, tparams, null, 0);
}
T[] CreateGenericParameters<T> (int first, Type[] tparams, ICustomAttributeProvider ca, int dynamicCursor) where T : TypeSpec
{
var tspec = new T [tparams.Length - first];
for (int pos = first; pos < tparams.Length; ++pos) {
var type = tparams[pos];
int index = pos - first;
if (type.HasElementType) {
var element = type.GetElementType ();
var spec = ImportType (element);
if (type.IsArray) {
tspec[index] = (T) (TypeSpec) ArrayContainer.MakeType (spec, type.GetArrayRank ());
continue;
}
throw new NotImplementedException ("Unknown element type " + type.ToString ());
}
tspec [index] = (T) CreateType (type, ca, dynamicCursor + index + 1, true);
}
return tspec;
}
public MethodSpec CreateMethod (MethodBase mb, TypeSpec declaringType)
{
Modifiers mod = ReadMethodModifiers (mb, declaringType);
TypeParameterSpec[] tparams;
ImportedMethodDefinition definition;
var parameters = CreateParameters (declaringType, mb.GetParameters (), mb);
if (mb.IsGenericMethod) {
if (!mb.IsGenericMethodDefinition)
throw new NotSupportedException ("assert");
tparams = CreateGenericParameters<TypeParameterSpec>(0, mb.GetGenericArguments (), null, 0);
definition = new ImportedGenericMethodDefinition ((MethodInfo) mb, parameters, tparams);
} else {
definition = new ImportedMethodDefinition (mb, parameters);
tparams = null;
}
MemberKind kind;
TypeSpec returnType;
if (mb.MemberType == MemberTypes.Constructor) {
kind = MemberKind.Constructor;
returnType = TypeManager.void_type;
} else {
//
// Detect operators and destructors
//
string name = mb.Name;
kind = MemberKind.Method;
if (tparams == null && !mb.DeclaringType.IsInterface && name.Length > 6) {
if ((mod & (Modifiers.STATIC | Modifiers.PUBLIC)) == (Modifiers.STATIC | Modifiers.PUBLIC)) {
if (name[2] == '_' && name[1] == 'p' && name[0] == 'o') {
var op_type = Operator.GetType (name);
if (op_type.HasValue && parameters.Count > 0 && parameters.Count < 3) {
kind = MemberKind.Operator;
}
}
} else if (parameters.IsEmpty && name == Destructor.MetadataName) {
kind = MemberKind.Destructor;
if (declaringType == TypeManager.object_type) {
mod &= ~Modifiers.OVERRIDE;
mod |= Modifiers.VIRTUAL;
}
}
}
var mi = (MethodInfo) mb;
returnType = ImportType (mi.ReturnType, mi.ReturnTypeCustomAttributes, 0);
// Cannot set to OVERRIDE without full hierarchy checks
// this flag indicates that the method could be override
// but further validation is needed
if ((mod & Modifiers.OVERRIDE) != 0 && kind == MemberKind.Method && declaringType.BaseType != null) {
var filter = MemberFilter.Method (name, tparams != null ? tparams.Length : 0, parameters, null);
var candidate = MemberCache.FindMember (declaringType.BaseType, filter, BindingRestriction.None);
//
// For imported class method do additional validation to be sure that metadata
// override flag was correct
//
// Difference between protected internal and protected is ok
//
const Modifiers conflict_mask = Modifiers.AccessibilityMask & ~Modifiers.INTERNAL;
if (candidate == null || (candidate.Modifiers & conflict_mask) != (mod & conflict_mask) || candidate.IsStatic) {
mod &= ~Modifiers.OVERRIDE;
}
}
}
MethodSpec ms = new MethodSpec (kind, declaringType, definition, returnType, mb, parameters, mod);
if (tparams != null)
ms.IsGeneric = true;
return ms;
}
//
// Imports System.Reflection parameters
//
AParametersCollection CreateParameters (TypeSpec parent, ParameterInfo[] pi, MethodBase method)
{
int varargs = method != null && (method.CallingConvention & CallingConventions.VarArgs) != 0 ? 1 : 0;
if (pi.Length == 0 && varargs == 0)
return ParametersCompiled.EmptyReadOnlyParameters;
TypeSpec[] types = new TypeSpec[pi.Length + varargs];
IParameterData[] par = new IParameterData[pi.Length + varargs];
bool is_params = false;
for (int i = 0; i < pi.Length; i++) {
ParameterInfo p = pi[i];
Parameter.Modifier mod = 0;
Expression default_value = null;
if (p.ParameterType.IsByRef) {
if ((p.Attributes & (ParameterAttributes.Out | ParameterAttributes.In)) == ParameterAttributes.Out)
mod = Parameter.Modifier.OUT;
else
mod = Parameter.Modifier.REF;
//
// Strip reference wrapping
//
var el = p.ParameterType.GetElementType ();
types[i] = ImportType (el, p, 0); // TODO: 1 to be csc compatible
} else if (i == 0 && method.IsStatic && parent.IsStatic && parent.MemberDefinition.DeclaringAssembly.HasExtensionMethod &&
HasExtensionAttribute (CustomAttributeData.GetCustomAttributes (method)) != null) {
mod = Parameter.Modifier.This;
types[i] = ImportType (p.ParameterType);
} else {
types[i] = ImportType (p.ParameterType, p, 0);
if (i >= pi.Length - 2 && types[i] is ArrayContainer) {
var cattrs = CustomAttributeData.GetCustomAttributes (p);
if (cattrs != null && cattrs.Any (l => l.Constructor.DeclaringType == typeof (ParamArrayAttribute))) {
mod = Parameter.Modifier.PARAMS;
is_params = true;
}
}
if (!is_params && p.IsOptional) {
object value = p.DefaultValue;
var ptype = types[i];
if (((p.Attributes & ParameterAttributes.HasDefault) != 0 && ptype.Kind != MemberKind.TypeParameter) || p.IsDefined (typeof (DecimalConstantAttribute), false)) {
var dtype = value == null ? ptype : ImportType (value.GetType ());
default_value = Constant.CreateConstant (null, dtype, value, Location.Null);
} else if (value == Missing.Value) {
default_value = EmptyExpression.MissingValue;
} else {
default_value = new DefaultValueExpression (new TypeExpression (ptype, Location.Null), Location.Null);
}
}
}
par[i] = new ParameterData (p.Name, mod, default_value);
}
if (varargs != 0) {
par[par.Length - 1] = new ArglistParameter (Location.Null);
types[types.Length - 1] = InternalType.Arglist;
}
return method != null ?
new ParametersImported (par, types, varargs != 0, is_params) :
new ParametersImported (par, types, is_params);
}
//
// Returns null when the property is not valid C# property
//
public PropertySpec CreateProperty (PropertyInfo pi, TypeSpec declaringType, MethodSpec get, MethodSpec set)
{
Modifiers mod = 0;
AParametersCollection param = null;
TypeSpec type = null;
if (get != null) {
mod = get.Modifiers;
param = get.Parameters;
type = get.ReturnType;
}
bool is_valid_property = true;
if (set != null) {
if (set.ReturnType != TypeManager.void_type)
is_valid_property = false;
var set_param_count = set.Parameters.Count - 1;
if (set_param_count < 0) {
set_param_count = 0;
is_valid_property = false;
}
var set_type = set.Parameters.Types[set_param_count];
if (mod == 0) {
AParametersCollection set_based_param;
if (set_param_count == 0) {
set_based_param = ParametersCompiled.EmptyReadOnlyParameters;
} else {
//
// Create indexer parameters based on setter method parameters (the last parameter has to be removed)
//
var data = new IParameterData[set_param_count];
var types = new TypeSpec[set_param_count];
Array.Copy (set.Parameters.FixedParameters, data, set_param_count);
Array.Copy (set.Parameters.Types, types, set_param_count);
set_based_param = new ParametersImported (data, types, set.Parameters.HasParams);
}
mod = set.Modifiers;
param = set_based_param;
type = set_type;
} else {
if (set_param_count != get.Parameters.Count)
is_valid_property = false;
if (get.ReturnType != set_type)
is_valid_property = false;
// Possible custom accessor modifiers
if ((mod & Modifiers.AccessibilityMask) != (set.Modifiers & Modifiers.AccessibilityMask)) {
var get_acc = mod & Modifiers.AccessibilityMask;
if (get_acc != Modifiers.PUBLIC) {
var set_acc = set.Modifiers & Modifiers.AccessibilityMask;
// If the accessor modifiers are not same, do extra restriction checks
if (get_acc != set_acc) {
var get_restr = ModifiersExtensions.IsRestrictedModifier (get_acc, set_acc);
var set_restr = ModifiersExtensions.IsRestrictedModifier (set_acc, get_acc);
if (get_restr && set_restr) {
is_valid_property = false; // Neither is more restrictive
}
if (get_restr) {
mod &= ~Modifiers.AccessibilityMask;
mod |= set_acc;
}
}
}
}
}
}
PropertySpec spec = null;
if (!param.IsEmpty) {
var index_name = declaringType.MemberDefinition.GetAttributeDefaultMember ();
if (index_name == null) {
is_valid_property = false;
} else {
if (get != null) {
if (get.IsStatic)
is_valid_property = false;
if (get.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
is_valid_property = false;
}
if (set != null) {
if (set.IsStatic)
is_valid_property = false;
if (set.Name.IndexOf (index_name, StringComparison.Ordinal) != 4)
is_valid_property = false;
}
}
if (is_valid_property)
spec = new IndexerSpec (declaringType, new ImportedIndexerDefinition (pi, param), type, param, pi, mod);
}
if (spec == null)
spec = new PropertySpec (MemberKind.Property, declaringType, new ImportedMemberDefinition (pi), type, pi, mod);
if (!is_valid_property) {
spec.IsNotRealProperty = true;
return spec;
}
if (set != null)
spec.Set = set;
if (get != null)
spec.Get = get;
return spec;
}
public TypeSpec CreateType (Type type)
{
return CreateType (type, null, 0, true);
}
TypeSpec CreateType (Type type, ICustomAttributeProvider ca, int dynamicCursor, bool canImportBaseType)
{
TypeSpec declaring_type;
if (type.IsNested && !type.IsGenericParameter)
declaring_type = CreateType (type.DeclaringType, type.DeclaringType, 0, true);
else
declaring_type = null;
return CreateType (type, declaring_type, ca, dynamicCursor, canImportBaseType);
}
public TypeSpec CreateType (Type type, TypeSpec declaringType, ICustomAttributeProvider ca, int dynamicCursor, bool canImportBaseType)
{
TypeSpec spec;
if (import_cache.TryGetValue (type, out spec)) {
if (ca == null)
return spec;
if (type == typeof (object)) {
if (IsDynamicType (ca, dynamicCursor))
return InternalType.Dynamic;
return spec;
}
if (!spec.IsGeneric)
return spec;
#if NET_4_0
if (!ca.IsDefined (typeof (DynamicAttribute), false))
#endif
return spec;
// We've found same object in the cache but this one has a dynamic custom attribute
// and it's most likely dynamic version of same type IFoo<object> agains IFoo<dynamic>
// Do resolve the type process again in that case
}
if (type.IsGenericType && !type.IsGenericTypeDefinition) {
var type_def = type.GetGenericTypeDefinition ();
var targs = CreateGenericParameters<TypeSpec> (0, type.GetGenericArguments (), ca, dynamicCursor);
if (declaringType == null) {
// Simple case, no nesting
spec = CreateType (type_def, null, null, 0, canImportBaseType);
spec = spec.MakeGenericType (targs);
} else {
//
// Nested type case, converting .NET types like
// A`1.B`1.C`1<int, long, string> to typespec like
// A<int>.B<long>.C<string>
//
var nested_hierarchy = new List<TypeSpec> ();
while (declaringType.IsNested) {
nested_hierarchy.Add (declaringType);
declaringType = declaringType.DeclaringType;
}
int targs_pos = 0;
if (declaringType.Arity > 0) {
spec = declaringType.MakeGenericType (targs.Skip (targs_pos).Take (declaringType.Arity).ToArray ());
targs_pos = spec.Arity;
} else {
spec = declaringType;
}
for (int i = nested_hierarchy.Count; i != 0; --i) {
var t = nested_hierarchy [i - 1];
spec = MemberCache.FindNestedType (spec, t.Name, t.Arity);
if (t.Arity > 0) {
spec = spec.MakeGenericType (targs.Skip (targs_pos).Take (spec.Arity).ToArray ());
targs_pos += t.Arity;
}
}
string name = type.Name;
int index = name.IndexOf ('`');
if (index > 0)
name = name.Substring (0, index);
spec = MemberCache.FindNestedType (spec, name, targs.Length - targs_pos);
if (spec.Arity > 0) {
spec = spec.MakeGenericType (targs.Skip (targs_pos).ToArray ());
}
}
// Don't add generic type with dynamic arguments, they can interfere with same type
// using object type arguments
if (!spec.HasDynamicElement) {
// Add to reading cache to speed up reading
if (!import_cache.ContainsKey (type))
import_cache.Add (type, spec);
}
return spec;
}
Modifiers mod;
MemberKind kind;
var ma = type.Attributes;
switch (ma & TypeAttributes.VisibilityMask) {
case TypeAttributes.Public:
case TypeAttributes.NestedPublic:
mod = Modifiers.PUBLIC;
break;
case TypeAttributes.NestedPrivate:
mod = Modifiers.PRIVATE;
break;
case TypeAttributes.NestedFamily:
mod = Modifiers.PROTECTED;
break;
case TypeAttributes.NestedFamORAssem:
mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
break;
default:
mod = Modifiers.INTERNAL;
break;
}
if ((ma & TypeAttributes.Interface) != 0) {
kind = MemberKind.Interface;
} else if (type.IsGenericParameter) {
kind = MemberKind.TypeParameter;
} else if (type.IsClass || type.IsAbstract) { // System.Reflection: System.Enum returns false for IsClass
if ((ma & TypeAttributes.Sealed) != 0 && type.IsSubclassOf (typeof (MulticastDelegate))) {
kind = MemberKind.Delegate;
mod |= Modifiers.SEALED;
} else {
kind = MemberKind.Class;
if ((ma & TypeAttributes.Sealed) != 0) {
mod |= Modifiers.SEALED;
if ((ma & TypeAttributes.Abstract) != 0)
mod |= Modifiers.STATIC;
} else if ((ma & TypeAttributes.Abstract) != 0) {
mod |= Modifiers.ABSTRACT;
}
}
} else if (type.IsEnum) {
kind = MemberKind.Enum;
} else {
kind = MemberKind.Struct;
mod |= Modifiers.SEALED;
}
var definition = new ImportedTypeDefinition (this, type);
PredefinedTypeSpec pt;
if (kind == MemberKind.Enum) {
const BindingFlags underlying_member = BindingFlags.DeclaredOnly |
BindingFlags.Instance |
BindingFlags.Public | BindingFlags.NonPublic;
var type_members = type.GetFields (underlying_member);
foreach (var type_member in type_members) {
spec = new EnumSpec (declaringType, definition, CreateType (type_member.FieldType), type, mod);
break;
}
if (spec == null)
kind = MemberKind.Class;
} else if (kind == MemberKind.TypeParameter) {
// Return as type_cache was updated
return CreateTypeParameter (type, declaringType);
} else if (type.IsGenericTypeDefinition) {
definition.TypeParameters = CreateGenericParameters<TypeParameterSpec>(type, declaringType);
// Constraints are not loaded on demand and can reference this type
if (import_cache.TryGetValue (type, out spec))
return spec;
} else if (type_2_predefined.TryGetValue (type, out pt)) {
spec = pt;
pt.SetDefinition (definition, type);
}
if (spec == null)
spec = new TypeSpec (kind, declaringType, definition, type, mod);
import_cache.Add (type, spec);
//
// Two stage setup as the base type can be inflated declaring type or
// another nested type inside same declaring type which has not been
// loaded, therefore we can import a base type of nested types once
// the types have been imported
//
if (canImportBaseType)
ImportTypeBase (spec, type);
return spec;
}
public ImportedAssemblyDefinition GetAssemblyDefinition (Assembly assembly)
{
ImportedAssemblyDefinition def;
if (!assembly_2_definition.TryGetValue (assembly, out def)) {
// This can happen in dynamic context only
def = new ImportedAssemblyDefinition (assembly);
assembly_2_definition.Add (assembly, def);
def.ReadAttributes ();
}
return def;
}
public void ImportTypeBase (Type type)
{
TypeSpec spec = import_cache[type];
if (spec != null)
ImportTypeBase (spec, type);
}
void ImportTypeBase (TypeSpec spec, Type type)
{
if (spec.Kind == MemberKind.Interface)
spec.BaseType = TypeManager.object_type;
else if (type.BaseType != null) {
if (type.BaseType.IsGenericType)
spec.BaseType = CreateType (type.BaseType, type, 0, true);
else
spec.BaseType = CreateType (type.BaseType);
}
var ifaces = type.GetInterfaces ();
if (ifaces.Length > 0) {
foreach (Type iface in ifaces) {
spec.AddInterface (CreateType (iface));
}
}
}
TypeParameterSpec CreateTypeParameter (Type type, TypeSpec declaringType)
{
Variance variance;
switch (type.GenericParameterAttributes & GenericParameterAttributes.VarianceMask) {
case GenericParameterAttributes.Covariant:
variance = Variance.Covariant;
break;
case GenericParameterAttributes.Contravariant:
variance = Variance.Contravariant;
break;
default:
variance = Variance.None;
break;
}
SpecialConstraint special = SpecialConstraint.None;
var import_special = type.GenericParameterAttributes & GenericParameterAttributes.SpecialConstraintMask;
if ((import_special & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0) {
special |= SpecialConstraint.Struct;
} else if ((import_special & GenericParameterAttributes.DefaultConstructorConstraint) != 0) {
special = SpecialConstraint.Constructor;
}
if ((import_special & GenericParameterAttributes.ReferenceTypeConstraint) != 0) {
special |= SpecialConstraint.Class;
}
TypeParameterSpec spec;
var def = new ImportedTypeParameterDefinition (type);
if (type.DeclaringMethod != null)
spec = new TypeParameterSpec (type.GenericParameterPosition, def, special, variance, type);
else
spec = new TypeParameterSpec (declaringType, type.GenericParameterPosition, def, special, variance, type);
// Add it now, so any constraint can reference it and get same instance
import_cache.Add (type, spec);
var constraints = type.GetGenericParameterConstraints ();
List<TypeSpec> tparams = null;
foreach (var ct in constraints) {
if (ct.IsGenericParameter) {
if (tparams == null)
tparams = new List<TypeSpec> ();
tparams.Add (CreateType (ct));
continue;
}
if (ct.IsClass) {
if (ct == typeof (ValueType)) {
spec.BaseType = TypeManager.value_type;
} else {
spec.BaseType = CreateType (ct);
}
continue;
}
spec.AddInterface (CreateType (ct));
}
if (spec.BaseType == null)
spec.BaseType = TypeManager.object_type;
if (tparams != null)
spec.TypeArguments = tparams.ToArray ();
return spec;
}
static Type HasExtensionAttribute (IList<CustomAttributeData> attributes)
{
foreach (var attr in attributes) {
var dt = attr.Constructor.DeclaringType;
if (dt.Name == "ExtensionAttribute" && dt.Namespace == "System.Runtime.CompilerServices") {
return dt;
}
}
return null;
}
public void ImportAssembly (Assembly assembly, RootNamespace targetNamespace)
{
// It can be used more than once when importing same assembly
// into 2 or more global aliases
ImportedAssemblyDefinition definition;
if (!assembly_2_definition.TryGetValue (assembly, out definition)) {
definition = new ImportedAssemblyDefinition (assembly);
assembly_2_definition.Add (assembly, definition);
definition.ReadAttributes ();
}
Type extension_type = definition.HasExtensionMethod ? HasExtensionAttribute (CustomAttributeData.GetCustomAttributes (assembly)) : null;
//
// This part tries to simulate loading of top-level
// types only, any missing dependencies are ignores here.
// Full error report is reported later when the type is
// actually used
//
Type[] all_types;
try {
all_types = assembly.GetTypes ();
} catch (ReflectionTypeLoadException e) {
all_types = e.Types;
}
ImportTypes (all_types, targetNamespace, extension_type);
}
public ImportedModuleDefinition ImportModule (Module module, RootNamespace targetNamespace)
{
var module_definition = new ImportedModuleDefinition (module, this);
module_definition.ReadAttributes ();
Type extension_type = HasExtensionAttribute (CustomAttributeData.GetCustomAttributes (module));
Type[] all_types;
try {
all_types = module.GetTypes ();
} catch (ReflectionTypeLoadException e) {
all_types = e.Types;
}
ImportTypes (all_types, targetNamespace, extension_type);
return module_definition;
}
void ImportTypes (Type[] types, Namespace targetNamespace, Type extension_type)
{
Namespace ns = targetNamespace;
string prev_namespace = null;
foreach (var t in types) {
if (t == null)
continue;
// Be careful not to trigger full parent type loading
if (t.MemberType == MemberTypes.NestedType)
continue;
if (t.Name[0] == '<')
continue;
var it = CreateType (t, null, t, 0, true);
if (it == null)
continue;
if (prev_namespace != t.Namespace) {
ns = t.Namespace == null ? targetNamespace : targetNamespace.GetNamespace (t.Namespace, true);
prev_namespace = t.Namespace;
}
ns.AddType (it);
if (it.IsStatic && extension_type != null && t.IsDefined (extension_type, false)) {
it.SetExtensionMethodContainer ();
}
}
}
public TypeSpec ImportType (Type type)
{
return ImportType (type, null, 0);
}
public TypeSpec ImportType (Type type, ICustomAttributeProvider ca, int dynamicCursor)
{
if (type.HasElementType) {
var element = type.GetElementType ();
var spec = ImportType (element, ca, dynamicCursor + 1);
if (type.IsArray)
return ArrayContainer.MakeType (spec, type.GetArrayRank ());
if (type.IsByRef)
return ReferenceContainer.MakeType (spec);
if (type.IsPointer)
return PointerContainer.MakeType (spec);
throw new NotImplementedException ("Unknown element type " + type.ToString ());
}
return CreateType (type, ca, dynamicCursor, true);
}
static bool IsDynamicType (ICustomAttributeProvider ca, int index)
{
#if NET_4_0
if (ca.IsDefined (typeof (DynamicAttribute), false)) {
if (index == 0)
return true;
var v = (DynamicAttribute) ca.GetCustomAttributes (typeof (DynamicAttribute), false)[0];
return v.TransformFlags[index];
}
#endif
return false;
}
//
// Decimal constants cannot be encoded in the constant blob, and thus are marked
// as IsInitOnly ('readonly' in C# parlance). We get its value from the
// DecimalConstantAttribute metadata.
//
static Constant ReadDecimalConstant (ICustomAttributeProvider fi)
{
object[] attrs = fi.GetCustomAttributes (typeof (DecimalConstantAttribute), false);
if (attrs.Length != 1)
return null;
return new DecimalConstant (((DecimalConstantAttribute) attrs [0]).Value, Location.Null);
}
static Modifiers ReadMethodModifiers (MethodBase mb, TypeSpec declaringType)
{
Modifiers mod;
var ma = mb.Attributes;
switch (ma & MethodAttributes.MemberAccessMask) {
case MethodAttributes.Public:
mod = Modifiers.PUBLIC;
break;
case MethodAttributes.Assembly:
mod = Modifiers.INTERNAL;
break;
case MethodAttributes.Family:
mod = Modifiers.PROTECTED;
break;
case MethodAttributes.FamORAssem:
mod = Modifiers.PROTECTED | Modifiers.INTERNAL;
break;
default:
mod = Modifiers.PRIVATE;
break;
}
if ((ma & MethodAttributes.Static) != 0) {
mod |= Modifiers.STATIC;
return mod;
}
if ((ma & MethodAttributes.Abstract) != 0 && declaringType.IsClass) {
mod |= Modifiers.ABSTRACT;
return mod;
}
if ((ma & MethodAttributes.Final) != 0)
mod |= Modifiers.SEALED;
// It can be sealed and override
if ((ma & MethodAttributes.Virtual) != 0) {
if ((ma & MethodAttributes.NewSlot) != 0 || !declaringType.IsClass) {
// No private virtual or sealed virtual
if ((mod & (Modifiers.PRIVATE | Modifiers.SEALED)) == 0)
mod |= Modifiers.VIRTUAL;
} else {
mod |= Modifiers.OVERRIDE;
}
}
return mod;
}
}
class ImportedMemberDefinition : IMemberDefinition
{
protected class AttributesBag
{
public static readonly AttributesBag Default = new AttributesBag ();
public AttributeUsageAttribute AttributeUsage;
public ObsoleteAttribute Obsolete;
public string[] Conditionals;
public string DefaultIndexerName;
public bool IsNotCLSCompliant;
public static AttributesBag Read (MemberInfo mi)
{
AttributesBag bag = null;
List<string> conditionals = null;
// It should not throw any loading exception
IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (mi);
foreach (var a in attrs) {
var type = a.Constructor.DeclaringType;
if (type == typeof (ObsoleteAttribute)) {
if (bag == null)
bag = new AttributesBag ();
var args = a.ConstructorArguments;
if (args.Count == 1) {
bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value);
} else if (args.Count == 2) {
bag.Obsolete = new ObsoleteAttribute ((string) args[0].Value, (bool) args[1].Value);
} else {
bag.Obsolete = new ObsoleteAttribute ();
}
continue;
}
if (type == typeof (ConditionalAttribute)) {
if (bag == null)
bag = new AttributesBag ();
if (conditionals == null)
conditionals = new List<string> (2);
conditionals.Add ((string) a.ConstructorArguments[0].Value);
continue;
}
if (type == typeof (CLSCompliantAttribute)) {
if (bag == null)
bag = new AttributesBag ();
bag.IsNotCLSCompliant = !(bool) a.ConstructorArguments[0].Value;
continue;
}
// Type only attributes
if (mi.MemberType == MemberTypes.TypeInfo || mi.MemberType == MemberTypes.NestedType) {
if (type == typeof (DefaultMemberAttribute)) {
if (bag == null)
bag = new AttributesBag ();
bag.DefaultIndexerName = (string) a.ConstructorArguments[0].Value;
continue;
}
if (type == typeof (AttributeUsageAttribute)) {
if (bag == null)
bag = new AttributesBag ();
bag.AttributeUsage = new AttributeUsageAttribute ((AttributeTargets) a.ConstructorArguments[0].Value);
foreach (var named in a.NamedArguments) {
if (named.MemberInfo.Name == "AllowMultiple")
bag.AttributeUsage.AllowMultiple = (bool) named.TypedValue.Value;
else if (named.MemberInfo.Name == "Inherited")
bag.AttributeUsage.Inherited = (bool) named.TypedValue.Value;
}
continue;
}
}
}
if (bag == null)
return Default;
if (conditionals != null)
bag.Conditionals = conditionals.ToArray ();
return bag;
}
}
protected readonly MemberInfo provider;
protected AttributesBag cattrs;
public ImportedMemberDefinition (MemberInfo provider)
{
this.provider = provider;
}
#region Properties
public bool IsImported {
get {
return true;
}
}
public virtual string Name {
get {
return provider.Name;
}
}
#endregion
public string[] ConditionalConditions ()
{
if (cattrs == null)
ReadAttributes ();
return cattrs.Conditionals;
}
public ObsoleteAttribute GetAttributeObsolete ()
{
if (cattrs == null)
ReadAttributes ();
return cattrs.Obsolete;
}
public bool IsNotCLSCompliant ()
{
if (cattrs == null)
ReadAttributes ();
return cattrs.IsNotCLSCompliant;
}
protected void ReadAttributes ()
{
cattrs = AttributesBag.Read (provider);
}
public void SetIsAssigned ()
{
// Unused for imported members
}
public void SetIsUsed ()
{
// Unused for imported members
}
}
public class ImportedModuleDefinition
{
readonly Module module;
bool cls_compliant;
//ReflectionMetaImporter metaImporter;
public ImportedModuleDefinition (Module module, ReflectionMetaImporter metaImporter)
{
this.module = module;
//this.metaImporter = metaImporter;
}
#region Properties
public bool IsCLSCompliant {
get {
return cls_compliant;
}
}
public string Name {
get {
return module.Name;
}
}
#endregion
public void ReadAttributes ()
{
IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (module);
foreach (var a in attrs) {
var type = a.Constructor.DeclaringType;
if (type == typeof (CLSCompliantAttribute)) {
cls_compliant = (bool) a.ConstructorArguments[0].Value;
continue;
}
}
}
//
// Reads assembly attributes which where attached to a special type because
// module does have assembly manifest
//
public List<Attribute> ReadAssemblyAttributes ()
{
var t = module.GetType (AssemblyAttributesPlaceholder.GetGeneratedName (Name));
if (t == null)
return null;
var field = t.GetField (AssemblyAttributesPlaceholder.AssemblyFieldName, BindingFlags.NonPublic | BindingFlags.Static);
if (field == null)
return null;
// TODO: implement, the idea is to fabricate specil Attribute class and
// add it to OptAttributes before resolving the source code attributes
// Need to build module location as well for correct error reporting
//var assembly_attributes = CustomAttributeData.GetCustomAttributes (field);
//var attrs = new List<Attribute> (assembly_attributes.Count);
//foreach (var a in assembly_attributes)
//{
// var type = metaImporter.ImportType (a.Constructor.DeclaringType);
// var ctor = metaImporter.CreateMethod (a.Constructor, type);
// foreach (var carg in a.ConstructorArguments) {
// carg.Value
// }
// attrs.Add (new Attribute ("assembly", ctor, null, Location.Null, true));
//}
return null;
}
}
public class ImportedAssemblyDefinition : IAssemblyDefinition
{
readonly Assembly assembly;
readonly AssemblyName aname;
bool cls_compliant;
bool contains_extension_methods;
List<AssemblyName> internals_visible_to;
Dictionary<IAssemblyDefinition, AssemblyName> internals_visible_to_cache;
public ImportedAssemblyDefinition (Assembly assembly)
{
this.assembly = assembly;
this.aname = assembly.GetName ();
}
#region Properties
public Assembly Assembly {
get {
return assembly;
}
}
public string FullName {
get {
return aname.FullName;
}
}
public bool HasExtensionMethod {
get {
return contains_extension_methods;
}
}
public bool HasStrongName {
get {
return aname.GetPublicKey ().Length != 0;
}
}
public bool IsCLSCompliant {
get {
return cls_compliant;
}
}
public string Location {
get {
return assembly.Location;
}
}
public string Name {
get {
return aname.Name;
}
}
#endregion
public byte[] GetPublicKeyToken ()
{
return aname.GetPublicKeyToken ();
}
public AssemblyName GetAssemblyVisibleToName (IAssemblyDefinition assembly)
{
return internals_visible_to_cache [assembly];
}
public bool IsFriendAssemblyTo (IAssemblyDefinition assembly)
{
if (internals_visible_to == null)
return false;
AssemblyName is_visible = null;
if (internals_visible_to_cache == null) {
internals_visible_to_cache = new Dictionary<IAssemblyDefinition, AssemblyName> ();
} else {
if (internals_visible_to_cache.TryGetValue (assembly, out is_visible))
return is_visible != null;
}
var token = assembly.GetPublicKeyToken ();
if (token != null && token.Length == 0)
token = null;
foreach (var internals in internals_visible_to) {
if (internals.Name != assembly.Name)
continue;
if (token == null && assembly is AssemblyDefinition) {
is_visible = internals;
break;
}
if (!ArrayComparer.IsEqual (token, internals.GetPublicKeyToken ()))
continue;
is_visible = internals;
break;
}
internals_visible_to_cache.Add (assembly, is_visible);
return is_visible != null;
}
public void ReadAttributes ()
{
IList<CustomAttributeData> attrs = CustomAttributeData.GetCustomAttributes (assembly);
foreach (var a in attrs) {
var type = a.Constructor.DeclaringType;
if (type == typeof (CLSCompliantAttribute)) {
cls_compliant = (bool) a.ConstructorArguments[0].Value;
continue;
}
if (type == typeof (InternalsVisibleToAttribute)) {
string s = a.ConstructorArguments[0].Value as string;
if (s == null)
continue;
var an = new AssemblyName (s);
if (internals_visible_to == null)
internals_visible_to = new List<AssemblyName> ();
internals_visible_to.Add (an);
continue;
}
if (type.Name == "ExtensionAttribute" && type.Namespace == "System.Runtime.CompilerServices") {
contains_extension_methods = true;
continue;
}
}
}
public override string ToString ()
{
return FullName;
}
}
class ImportedMethodDefinition : ImportedMemberDefinition, IParametersMember
{
readonly AParametersCollection parameters;
public ImportedMethodDefinition (MethodBase provider, AParametersCollection parameters)
: base (provider)
{
this.parameters = parameters;
}
#region Properties
public AParametersCollection Parameters {
get {
return parameters;
}
}
public TypeSpec MemberType {
get {
throw new NotImplementedException ();
}
}
#endregion
}
class ImportedIndexerDefinition : ImportedMemberDefinition, IParametersMember
{
readonly AParametersCollection parameters;
public ImportedIndexerDefinition (PropertyInfo provider, AParametersCollection parameters)
: base (provider)
{
this.parameters = parameters;
}
#region Properties
public AParametersCollection Parameters {
get {
return parameters;
}
}
public TypeSpec MemberType {
get {
throw new NotImplementedException ();
}
}
#endregion
}
class ImportedGenericMethodDefinition : ImportedMethodDefinition, IGenericMethodDefinition
{
TypeParameterSpec[] tparams;
public ImportedGenericMethodDefinition (MethodInfo provider, AParametersCollection parameters, TypeParameterSpec[] tparams)
: base (provider, parameters)
{
this.tparams = tparams;
}
#region Properties
public TypeParameterSpec[] TypeParameters {
get {
return tparams;
}
}
public int TypeParametersCount {
get {
return tparams.Length;
}
}
#endregion
}
class ImportedTypeDefinition : ImportedMemberDefinition, ITypeDefinition
{
TypeParameterSpec[] tparams;
string name;
ReflectionMetaImporter meta_import;
public ImportedTypeDefinition (ReflectionMetaImporter metaImport, Type type)
: base (type)
{
this.meta_import = metaImport;
}
#region Properties
public IAssemblyDefinition DeclaringAssembly {
get {
return meta_import.GetAssemblyDefinition (provider.Module.Assembly);
}
}
public override string Name {
get {
if (name == null) {
name = base.Name;
if (tparams != null)
name = name.Substring (0, name.IndexOf ('`'));
}
return name;
}
}
public string Namespace {
get {
return ((Type) provider).Namespace;
}
}
public int TypeParametersCount {
get {
return tparams == null ? 0 : tparams.Length;
}
}
public TypeParameterSpec[] TypeParameters {
get {
return tparams;
}
set {
tparams = value;
}
}
#endregion
public TypeSpec GetAttributeCoClass ()
{
// TODO: Use ReadAttributes
var attr = provider.GetCustomAttributes (typeof (CoClassAttribute), false);
if (attr.Length < 1)
return null;
return meta_import.CreateType (((CoClassAttribute) attr[0]).CoClass);
}
public string GetAttributeDefaultMember ()
{
if (cattrs == null)
ReadAttributes ();
return cattrs.DefaultIndexerName;
}
public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
{
if (cattrs == null)
ReadAttributes ();
return cattrs.AttributeUsage;
}
bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
{
var a = meta_import.GetAssemblyDefinition (provider.Module.Assembly);
return a == assembly || a.IsFriendAssemblyTo (assembly);
}
public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
{
//
// Not interested in members of nested private types unless the importer needs them
//
if (declaringType.IsPrivate && meta_import.IgnorePrivateMembers) {
cache = MemberCache.Empty;
return;
}
var loading_type = (Type) provider;
const BindingFlags all_members = BindingFlags.DeclaredOnly |
BindingFlags.Static | BindingFlags.Instance |
BindingFlags.Public | BindingFlags.NonPublic;
const MethodAttributes explicit_impl = MethodAttributes.NewSlot |
MethodAttributes.Virtual | MethodAttributes.HideBySig |
MethodAttributes.Final;
Dictionary<MethodBase, MethodSpec> possible_accessors = null;
List<EventSpec> imported_events = null;
EventSpec event_spec;
MemberSpec imported;
MethodInfo m;
MemberInfo[] all;
try {
all = loading_type.GetMembers (all_members);
} catch (Exception e) {
throw new InternalErrorException (e, "Could not import type `{0}' from `{1}'",
declaringType.GetSignatureForError (), declaringType.MemberDefinition.DeclaringAssembly.FullName);
}
if (cache == null) {
cache = new MemberCache (all.Length);
//
// Do the types first as they can be referenced by the members before
// they are found or inflated
//
foreach (var member in all) {
if (member.MemberType != MemberTypes.NestedType)
continue;
Type t = (Type) member;
// Ignore compiler generated types, mostly lambda containers
if (t.IsNotPublic && t.IsDefined (typeof (CompilerGeneratedAttribute), false))
continue;
imported = meta_import.CreateType (t, declaringType, t, 0, false);
cache.AddMember (imported);
}
foreach (var member in all) {
if (member.MemberType != MemberTypes.NestedType)
continue;
meta_import.ImportTypeBase ((Type) member);
}
}
if (!onlyTypes) {
//
// The logic here requires methods to be returned first which seems to work for both Mono and .NET
//
foreach (var member in all) {
switch (member.MemberType) {
case MemberTypes.Constructor:
case MemberTypes.Method:
MethodBase mb = (MethodBase) member;
var attrs = mb.Attributes;
if ((attrs & MethodAttributes.MemberAccessMask) == MethodAttributes.Private) {
if (meta_import.IgnorePrivateMembers)
continue;
// Ignore explicitly implemented members
if ((attrs & explicit_impl) == explicit_impl)
continue;
// Ignore compiler generated methods
if (mb.IsDefined (typeof (CompilerGeneratedAttribute), false))
continue;
}
imported = meta_import.CreateMethod (mb, declaringType);
if (imported.Kind == MemberKind.Method && !imported.IsGeneric) {
if (possible_accessors == null)
possible_accessors = new Dictionary<MethodBase, MethodSpec> (ReferenceEquality<MethodBase>.Default);
// There are no metadata rules for accessors, we have to consider any method as possible candidate
possible_accessors.Add (mb, (MethodSpec) imported);
}
break;
case MemberTypes.Property:
if (possible_accessors == null)
continue;
var p = (PropertyInfo) member;
//
// Links possible accessors with property
//
MethodSpec get, set;
m = p.GetGetMethod (true);
if (m == null || !possible_accessors.TryGetValue (m, out get))
get = null;
m = p.GetSetMethod (true);
if (m == null || !possible_accessors.TryGetValue (m, out set))
set = null;
// No accessors registered (e.g. explicit implementation)
if (get == null && set == null)
continue;
imported = meta_import.CreateProperty (p, declaringType, get, set);
if (imported == null)
continue;
break;
case MemberTypes.Event:
if (possible_accessors == null)
continue;
var e = (EventInfo) member;
//
// Links accessors with event
//
MethodSpec add, remove;
m = e.GetAddMethod (true);
if (m == null || !possible_accessors.TryGetValue (m, out add))
add = null;
m = e.GetRemoveMethod (true);
if (m == null || !possible_accessors.TryGetValue (m, out remove))
remove = null;
// Both accessors are required
if (add == null || remove == null)
continue;
event_spec = meta_import.CreateEvent (e, declaringType, add, remove);
if (!meta_import.IgnorePrivateMembers) {
if (imported_events == null)
imported_events = new List<EventSpec> ();
imported_events.Add (event_spec);
}
imported = event_spec;
break;
case MemberTypes.Field:
var fi = (FieldInfo) member;
imported = meta_import.CreateField (fi, declaringType);
if (imported == null)
continue;
//
// For dynamic binder event has to be fully restored to allow operations
// within the type container to work correctly
//
if (imported_events != null) {
// The backing event field should be private but it may not
int index = imported_events.FindIndex (l => l.Name == fi.Name);
if (index >= 0) {
event_spec = imported_events[index];
event_spec.BackingField = (FieldSpec) imported;
imported_events.RemoveAt (index);
continue;
}
}
break;
case MemberTypes.NestedType:
// Already in the cache from the first pass
continue;
default:
throw new NotImplementedException (member.ToString ());
}
cache.AddMember (imported);
}
}
if (declaringType.IsInterface && declaringType.Interfaces != null) {
foreach (var iface in declaringType.Interfaces) {
cache.AddInterface (iface);
}
}
}
}
class ImportedTypeParameterDefinition : ImportedMemberDefinition, ITypeDefinition
{
public ImportedTypeParameterDefinition (Type type)
: base (type)
{
}
#region Properties
public IAssemblyDefinition DeclaringAssembly {
get {
throw new NotImplementedException ();
}
}
public string Namespace {
get {
return null;
}
}
public int TypeParametersCount {
get {
return 0;
}
}
public TypeParameterSpec[] TypeParameters {
get {
return null;
}
}
#endregion
public TypeSpec GetAttributeCoClass ()
{
return null;
}
public string GetAttributeDefaultMember ()
{
throw new NotSupportedException ();
}
public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
{
throw new NotSupportedException ();
}
bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
{
throw new NotImplementedException ();
}
public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
{
throw new NotImplementedException ();
}
}
}