2 // typemanager.cs: C# type manager
4 // Author: Miguel de Icaza (miguel@gnu.org)
5 // Ravi Pratap (ravi@ximian.com)
6 // Marek Safar (marek.safar@seznam.cz)
8 // Dual licensed under the terms of the MIT X11 or GNU GPL
10 // Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
11 // Copyright 2003-2008 Novell, Inc.
16 using System.Globalization;
17 using System.Collections.Generic;
18 using System.Reflection;
19 using System.Reflection.Emit;
21 using System.Runtime.CompilerServices;
22 using System.Diagnostics;
25 namespace Mono.CSharp {
27 partial class TypeManager {
29 // A list of core types that the compiler requires or uses
31 static public PredefinedTypeSpec object_type;
32 static public PredefinedTypeSpec value_type;
33 static public PredefinedTypeSpec string_type;
34 static public PredefinedTypeSpec int32_type;
35 static public PredefinedTypeSpec uint32_type;
36 static public PredefinedTypeSpec int64_type;
37 static public PredefinedTypeSpec uint64_type;
38 static public PredefinedTypeSpec float_type;
39 static public PredefinedTypeSpec double_type;
40 static public PredefinedTypeSpec char_type;
41 static public PredefinedTypeSpec short_type;
42 static public PredefinedTypeSpec decimal_type;
43 static public PredefinedTypeSpec bool_type;
44 static public PredefinedTypeSpec sbyte_type;
45 static public PredefinedTypeSpec byte_type;
46 static public PredefinedTypeSpec ushort_type;
47 static public PredefinedTypeSpec enum_type;
48 static public PredefinedTypeSpec delegate_type;
49 static public PredefinedTypeSpec multicast_delegate_type;
50 static public PredefinedTypeSpec void_type;
51 static public PredefinedTypeSpec array_type;
52 static public PredefinedTypeSpec runtime_handle_type;
53 static public PredefinedTypeSpec type_type;
54 static public PredefinedTypeSpec ienumerator_type;
55 static public PredefinedTypeSpec ienumerable_type;
56 static public PredefinedTypeSpec idisposable_type;
57 static public PredefinedTypeSpec intptr_type;
58 static public PredefinedTypeSpec uintptr_type;
59 static public PredefinedTypeSpec runtime_field_handle_type;
60 static public PredefinedTypeSpec attribute_type;
61 static public PredefinedTypeSpec exception_type;
64 static public TypeSpec typed_reference_type;
65 static public TypeSpec arg_iterator_type;
66 static public TypeSpec mbr_type;
67 public static TypeSpec runtime_helpers_type;
68 static public TypeSpec iasyncresult_type;
69 static public TypeSpec asynccallback_type;
70 static public TypeSpec runtime_argument_handle_type;
71 static public TypeSpec void_ptr_type;
76 static internal TypeSpec isvolatile_type;
77 static public TypeSpec generic_ilist_type;
78 static public TypeSpec generic_icollection_type;
79 static public TypeSpec generic_ienumerator_type;
80 static public TypeSpec generic_ienumerable_type;
81 static public TypeSpec generic_nullable_type;
86 static internal TypeSpec expression_type;
87 public static TypeSpec parameter_expression_type;
88 public static TypeSpec fieldinfo_type;
89 public static TypeSpec methodinfo_type;
90 public static TypeSpec ctorinfo_type;
95 public static TypeSpec call_site_type;
96 public static TypeSpec generic_call_site_type;
97 public static TypeExpr binder_type;
98 public static TypeSpec binder_flags;
100 public static TypeExpr expression_type_expr;
104 // These methods are called by code generated by the compiler
106 static public FieldSpec string_empty;
107 static public MethodSpec system_type_get_type_from_handle;
108 static public MethodSpec bool_movenext_void;
109 static public MethodSpec void_dispose_void;
110 static public MethodSpec void_monitor_enter_object;
111 static public MethodSpec void_monitor_exit_object;
112 static public MethodSpec void_initializearray_array_fieldhandle;
113 static public MethodSpec delegate_combine_delegate_delegate;
114 static public MethodSpec delegate_remove_delegate_delegate;
115 static public PropertySpec int_get_offset_to_string_data;
116 static public MethodSpec int_interlocked_compare_exchange;
117 static public PropertySpec ienumerator_getcurrent;
118 public static MethodSpec methodbase_get_type_from_handle;
119 public static MethodSpec methodbase_get_type_from_handle_generic;
120 public static MethodSpec fieldinfo_get_field_from_handle;
121 public static MethodSpec fieldinfo_get_field_from_handle_generic;
122 public static MethodSpec activator_create_instance;
127 static public MethodSpec void_decimal_ctor_five_args;
128 static public MethodSpec void_decimal_ctor_int_arg;
129 public static MethodSpec void_decimal_ctor_long_arg;
131 static Dictionary<Assembly, bool> assembly_internals_vis_attrs;
133 static TypeManager ()
138 static public void Reset ()
140 // object_type = null;
142 assembly_internals_vis_attrs = new Dictionary<Assembly, bool> ();
144 // TODO: I am really bored by all this static stuff
145 system_type_get_type_from_handle =
148 void_monitor_enter_object =
149 void_monitor_exit_object =
150 void_initializearray_array_fieldhandle =
151 int_interlocked_compare_exchange =
152 methodbase_get_type_from_handle =
153 methodbase_get_type_from_handle_generic =
154 fieldinfo_get_field_from_handle =
155 fieldinfo_get_field_from_handle_generic =
156 activator_create_instance =
157 delegate_combine_delegate_delegate =
158 delegate_remove_delegate_delegate = null;
160 int_get_offset_to_string_data =
161 ienumerator_getcurrent = null;
163 void_decimal_ctor_five_args =
164 void_decimal_ctor_int_arg =
165 void_decimal_ctor_long_arg = null;
170 generic_call_site_type =
175 typed_reference_type = arg_iterator_type = mbr_type =
176 runtime_helpers_type = iasyncresult_type = asynccallback_type =
177 runtime_argument_handle_type = void_ptr_type = isvolatile_type =
178 generic_ilist_type = generic_icollection_type = generic_ienumerator_type =
179 generic_ienumerable_type = generic_nullable_type = expression_type =
180 parameter_expression_type = fieldinfo_type = methodinfo_type = ctorinfo_type = null;
182 expression_type_expr = null;
186 /// Returns the C# name of a type if possible, or the full type name otherwise
188 static public string CSharpName (TypeSpec t)
190 return t.GetSignatureForError ();
193 static public string CSharpName (IList<TypeSpec> types)
195 if (types.Count == 0)
198 StringBuilder sb = new StringBuilder ();
199 for (int i = 0; i < types.Count; ++i) {
203 sb.Append (CSharpName (types [i]));
205 return sb.ToString ();
208 static public string GetFullNameSignature (MemberSpec mi)
210 return mi.GetSignatureForError ();
213 static public string CSharpSignature (MemberSpec mb)
215 return mb.GetSignatureForError ();
219 // Looks up a type, and aborts if it is not found. This is used
220 // by predefined types required by the compiler
222 public static TypeSpec CoreLookupType (CompilerContext ctx, string ns_name, string name, MemberKind kind, bool required)
224 return CoreLookupType (ctx, ns_name, name, 0, kind, required);
227 public static TypeSpec CoreLookupType (CompilerContext ctx, string ns_name, string name, int arity, MemberKind kind, bool required)
229 Namespace ns = GlobalRootNamespace.Instance.GetNamespace (ns_name, true);
230 var te = ns.LookupType (ctx, name, arity, !required, Location.Null);
231 var ts = te == null ? null : te.Type;
237 ctx.Report.Error (518, "The predefined type `{0}.{1}' is not defined or imported",
242 if (ts.Kind != kind) {
243 ctx.Report.Error (520, "The predefined type `{0}.{1}' is not declared correctly",
251 static MemberSpec GetPredefinedMember (TypeSpec t, MemberFilter filter, Location loc)
253 var member = MemberCache.FindMember (t, filter, BindingRestriction.DeclaredOnly);
255 if (member != null && member.IsAccessible (InternalType.FakeInternalType))
258 string method_args = null;
259 if (filter.Parameters != null)
260 method_args = filter.Parameters.GetSignatureForError ();
262 RootContext.ToplevelTypes.Compiler.Report.Error (656, loc, "The compiler required member `{0}.{1}{2}' could not be found or is inaccessible",
263 TypeManager.CSharpName (t), filter.Name, method_args);
269 // Returns the ConstructorInfo for "args"
271 public static MethodSpec GetPredefinedConstructor (TypeSpec t, Location loc, params TypeSpec [] args)
273 var pc = ParametersCompiled.CreateFullyResolved (args);
274 return GetPredefinedMember (t, MemberFilter.Constructor (pc), loc) as MethodSpec;
278 // Returns the method specification for a method named `name' defined
279 // in type `t' which takes arguments of types `args'
281 public static MethodSpec GetPredefinedMethod (TypeSpec t, string name, Location loc, params TypeSpec [] args)
283 var pc = ParametersCompiled.CreateFullyResolved (args);
284 return GetPredefinedMethod (t, MemberFilter.Method (name, 0, pc, null), loc);
287 public static MethodSpec GetPredefinedMethod (TypeSpec t, MemberFilter filter, Location loc)
289 return GetPredefinedMember (t, filter, loc) as MethodSpec;
292 public static FieldSpec GetPredefinedField (TypeSpec t, string name, Location loc, TypeSpec type)
294 return GetPredefinedMember (t, MemberFilter.Field (name, type), loc) as FieldSpec;
297 public static PropertySpec GetPredefinedProperty (TypeSpec t, string name, Location loc, TypeSpec type)
299 return GetPredefinedMember (t, MemberFilter.Property (name, type), loc) as PropertySpec;
302 public static IList<PredefinedTypeSpec> InitCoreTypes ()
304 var core_types = new PredefinedTypeSpec[] {
305 object_type = new PredefinedTypeSpec (MemberKind.Class, "System", "Object"),
306 value_type = new PredefinedTypeSpec (MemberKind.Class, "System", "ValueType"),
307 attribute_type = new PredefinedTypeSpec (MemberKind.Class, "System", "Attribute"),
309 int32_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Int32"),
310 int64_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Int64"),
311 uint32_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "UInt32"),
312 uint64_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "UInt64"),
313 byte_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Byte"),
314 sbyte_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "SByte"),
315 short_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Int16"),
316 ushort_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "UInt16"),
318 ienumerator_type = new PredefinedTypeSpec (MemberKind.Interface, "System.Collections", "IEnumerator"),
319 ienumerable_type = new PredefinedTypeSpec (MemberKind.Interface, "System.Collections", "IEnumerable"),
320 idisposable_type = new PredefinedTypeSpec (MemberKind.Interface, "System", "IDisposable"),
322 char_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Char"),
323 string_type = new PredefinedTypeSpec (MemberKind.Class, "System", "String"),
324 float_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Single"),
325 double_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Double"),
326 decimal_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Decimal"),
327 bool_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Boolean"),
328 intptr_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "IntPtr"),
329 uintptr_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "UIntPtr"),
331 multicast_delegate_type = new PredefinedTypeSpec (MemberKind.Class, "System", "MulticastDelegate"),
332 delegate_type = new PredefinedTypeSpec (MemberKind.Class, "System", "Delegate"),
333 enum_type = new PredefinedTypeSpec (MemberKind.Class, "System", "Enum"),
334 array_type = new PredefinedTypeSpec (MemberKind.Class, "System", "Array"),
335 void_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "Void"),
336 type_type = new PredefinedTypeSpec (MemberKind.Class, "System", "Type"),
337 exception_type = new PredefinedTypeSpec (MemberKind.Class, "System", "Exception"),
338 runtime_field_handle_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "RuntimeFieldHandle"),
339 runtime_handle_type = new PredefinedTypeSpec (MemberKind.Struct, "System", "RuntimeTypeHandle"),
346 /// The types have to be initialized after the initial
347 /// population of the type has happened (for example, to
348 /// bootstrap the corlib.dll
350 public static bool InitCoreTypes (CompilerContext ctx, IList<PredefinedTypeSpec> predefined)
352 foreach (var p in predefined) {
353 var found = CoreLookupType (ctx, p.Namespace, p.Name, p.Kind, true);
354 if (found == null || found == p)
357 if (!RootContext.StdLib) {
358 var ns = GlobalRootNamespace.Instance.GetNamespace (p.Namespace, false);
359 ns.ReplaceTypeWithPredefined (found, p);
361 var tc = found.MemberDefinition as TypeContainer;
362 tc.SetPredefinedSpec (p);
363 p.SetDefinition (found);
367 ctx.PredefinedAttributes.ParamArray.Initialize (ctx, false);
368 ctx.PredefinedAttributes.Out.Initialize (ctx, false);
370 if (InternalType.Dynamic.GetMetaInfo () == null) {
371 InternalType.Dynamic.SetMetaInfo (object_type.GetMetaInfo ());
373 if (object_type.MemberDefinition.IsImported)
374 InternalType.Dynamic.MemberCache = object_type.MemberCache;
376 InternalType.Null.SetMetaInfo (object_type.GetMetaInfo ());
379 return ctx.Report.Errors == 0;
383 // Initializes optional core types
385 public static void InitOptionalCoreTypes (CompilerContext ctx)
387 void_ptr_type = PointerContainer.MakeType (void_type);
390 // Initialize InternalsVisibleTo as the very first optional type. Otherwise we would populate
391 // types cache with incorrect accessiblity when any of optional types is internal.
393 ctx.PredefinedAttributes.Initialize (ctx);
395 runtime_argument_handle_type = CoreLookupType (ctx, "System", "RuntimeArgumentHandle", MemberKind.Struct, false);
396 asynccallback_type = CoreLookupType (ctx, "System", "AsyncCallback", MemberKind.Delegate, false);
397 iasyncresult_type = CoreLookupType (ctx, "System", "IAsyncResult", MemberKind.Interface, false);
398 typed_reference_type = CoreLookupType (ctx, "System", "TypedReference", MemberKind.Struct, false);
399 arg_iterator_type = CoreLookupType (ctx, "System", "ArgIterator", MemberKind.Struct, false);
400 mbr_type = CoreLookupType (ctx, "System", "MarshalByRefObject", MemberKind.Class, false);
402 generic_ienumerator_type = CoreLookupType (ctx, "System.Collections.Generic", "IEnumerator", 1, MemberKind.Interface, false);
403 generic_ilist_type = CoreLookupType (ctx, "System.Collections.Generic", "IList", 1, MemberKind.Interface, false);
404 generic_icollection_type = CoreLookupType (ctx, "System.Collections.Generic", "ICollection", 1, MemberKind.Interface, false);
405 generic_ienumerable_type = CoreLookupType (ctx, "System.Collections.Generic", "IEnumerable", 1, MemberKind.Interface, false);
406 generic_nullable_type = CoreLookupType (ctx, "System", "Nullable", 1, MemberKind.Struct, false);
409 // Optional types which are used as types and for member lookup
411 runtime_helpers_type = CoreLookupType (ctx, "System.Runtime.CompilerServices", "RuntimeHelpers", MemberKind.Class, false);
414 // Note: extension_attribute_type is already loaded
415 expression_type = CoreLookupType (ctx, "System.Linq.Expressions", "Expression", 1, MemberKind.Class, false);
418 public static bool IsBuiltinType (TypeSpec t)
420 if (t == object_type || t == string_type || t == int32_type || t == uint32_type ||
421 t == int64_type || t == uint64_type || t == float_type || t == double_type ||
422 t == char_type || t == short_type || t == decimal_type || t == bool_type ||
423 t == sbyte_type || t == byte_type || t == ushort_type || t == void_type)
430 // This is like IsBuiltinType, but lacks decimal_type, we should also clean up
431 // the pieces in the code where we use IsBuiltinType and special case decimal_type.
433 public static bool IsPrimitiveType (TypeSpec t)
435 return (t == int32_type || t == uint32_type ||
436 t == int64_type || t == uint64_type || t == float_type || t == double_type ||
437 t == char_type || t == short_type || t == bool_type ||
438 t == sbyte_type || t == byte_type || t == ushort_type);
442 public static bool IsDelegateType (TypeSpec t)
448 // When any element of the type is a dynamic type
450 // This method builds a transformation array for dynamic types
451 // used in places where DynamicAttribute cannot be applied to.
452 // It uses bool flag when type is of dynamic type and each
453 // section always starts with "false" for some reason.
455 // LAMESPEC: This should be part of C# specification !
457 // Example: Func<dynamic, int, dynamic[]>
458 // Transformation: { false, true, false, false, true }
460 public static bool[] HasDynamicTypeUsed (TypeSpec t)
462 var ac = t as ArrayContainer;
464 if (HasDynamicTypeUsed (ac.Element) != null)
465 return new bool[] { false, true };
473 if (IsGenericType (t)) {
474 List<bool> transform = null;
475 var targs = GetTypeArguments (t);
476 for (int i = 0; i < targs.Length; ++i) {
477 var element = HasDynamicTypeUsed (targs [i]);
478 if (element != null) {
479 if (transform == null) {
480 transform = new List<bool> ();
481 for (int ii = 0; ii <= i; ++ii)
482 transform.Add (false);
485 transform.AddRange (element);
486 } else if (transform != null) {
487 transform.Add (false);
491 if (transform != null)
492 return transform.ToArray ();
495 if (object.ReferenceEquals (InternalType.Dynamic, t))
496 return new bool [] { true };
502 public static bool IsEnumType (TypeSpec t)
507 public static bool IsBuiltinOrEnum (TypeSpec t)
509 if (IsBuiltinType (t))
519 // Whether a type is unmanaged. This is used by the unsafe code (25.2)
521 public static bool IsUnmanagedType (TypeSpec t)
523 var ds = t.MemberDefinition as DeclSpace;
525 return ds.IsUnmanagedType ();
527 // some builtins that are not unmanaged types
528 if (t == TypeManager.object_type || t == TypeManager.string_type)
531 if (IsBuiltinOrEnum (t))
534 // Someone did the work of checking if the ElementType of t is unmanaged. Let's not repeat it.
536 return IsUnmanagedType (GetElementType (t));
538 if (!IsValueType (t))
541 if (t.IsNested && t.DeclaringType.IsGenericOrParentIsGeneric)
548 // Null is considered to be a reference type
550 public static bool IsReferenceType (TypeSpec t)
552 if (t.IsGenericParameter)
553 return ((TypeParameterSpec) t).IsReferenceType;
555 return !t.IsStruct && !IsEnumType (t);
558 public static bool IsValueType (TypeSpec t)
560 if (t.IsGenericParameter)
561 return ((TypeParameterSpec) t).IsValueType;
563 return t.IsStruct || IsEnumType (t);
566 public static bool IsStruct (TypeSpec t)
571 public static bool IsFamilyAccessible (TypeSpec type, TypeSpec parent)
573 // TypeParameter tparam = LookupTypeParameter (type);
574 // TypeParameter pparam = LookupTypeParameter (parent);
576 if (type.Kind == MemberKind.TypeParameter && parent.Kind == MemberKind.TypeParameter) { // (tparam != null) && (pparam != null)) {
580 throw new NotImplementedException ("net");
581 // return tparam.IsSubclassOf (parent);
585 if (IsInstantiationOfSameGenericType (type, parent))
588 type = type.BaseType;
589 } while (type != null);
595 // Checks whether `type' is a subclass or nested child of `base_type'.
597 public static bool IsNestedFamilyAccessible (TypeSpec type, TypeSpec base_type)
600 if (IsFamilyAccessible (type, base_type))
603 // Handle nested types.
604 type = type.DeclaringType;
605 } while (type != null);
611 // Checks whether `type' is a nested child of `parent'.
613 public static bool IsNestedChildOf (TypeSpec type, TypeSpec parent)
618 type = type.GetDefinition (); // DropGenericTypeArguments (type);
619 parent = parent.GetDefinition (); // DropGenericTypeArguments (parent);
624 type = type.DeclaringType;
625 while (type != null) {
626 if (type.GetDefinition () == parent)
629 type = type.DeclaringType;
635 public static bool IsSpecialType (TypeSpec t)
637 return t == arg_iterator_type || t == typed_reference_type;
641 // Checks whether `invocationAssembly' is same or a friend of the assembly
643 public static bool IsThisOrFriendAssembly (Assembly invocationAssembly, Assembly assembly)
645 if (assembly == null)
646 throw new ArgumentNullException ("assembly");
648 // TODO: This can happen for constants used at assembly level and
649 // predefined members
650 // But there is no way to test for it for now, so it could be abused
652 if (invocationAssembly == null)
653 invocationAssembly = CodeGen.Assembly.Builder;
655 if (invocationAssembly == assembly)
659 if (assembly_internals_vis_attrs.TryGetValue (assembly, out value))
662 object[] attrs = assembly.GetCustomAttributes (typeof (InternalsVisibleToAttribute), false);
663 if (attrs.Length == 0) {
664 assembly_internals_vis_attrs.Add (assembly, false);
668 bool is_friend = false;
670 AssemblyName this_name = CodeGen.Assembly.Name;
671 if (this_name == null)
674 byte [] this_token = this_name.GetPublicKeyToken ();
675 foreach (InternalsVisibleToAttribute attr in attrs) {
676 if (attr.AssemblyName == null || attr.AssemblyName.Length == 0)
679 AssemblyName aname = null;
681 aname = new AssemblyName (attr.AssemblyName);
682 } catch (FileLoadException) {
683 } catch (ArgumentException) {
686 if (aname == null || aname.Name != this_name.Name)
689 byte [] key_token = aname.GetPublicKeyToken ();
690 if (key_token != null) {
691 if (this_token.Length == 0) {
692 // Same name, but assembly is not strongnamed
693 Error_FriendAccessNameNotMatching (aname.FullName, RootContext.ToplevelTypes.Compiler.Report);
697 if (!CompareKeyTokens (this_token, key_token))
705 assembly_internals_vis_attrs.Add (assembly, is_friend);
709 static bool CompareKeyTokens (byte [] token1, byte [] token2)
711 for (int i = 0; i < token1.Length; i++)
712 if (token1 [i] != token2 [i])
718 static void Error_FriendAccessNameNotMatching (string other_name, Report Report)
721 "Friend access was granted to `{0}', but the output assembly is named `{1}'. Try adding a reference to `{0}' or change the output assembly name to match it",
722 other_name, CodeGen.Assembly.Name.FullName);
725 public static TypeSpec GetElementType (TypeSpec t)
727 return ((ElementTypeSpec)t).Element;
731 /// This method is not implemented by MS runtime for dynamic types
733 public static bool HasElementType (TypeSpec t)
735 return t is ElementTypeSpec;
738 static NumberFormatInfo nf_provider = CultureInfo.CurrentCulture.NumberFormat;
740 // This is a custom version of Convert.ChangeType() which works
741 // with the TypeBuilder defined types when compiling corlib.
742 public static object ChangeType (object value, TypeSpec targetType, out bool error)
744 IConvertible convert_value = value as IConvertible;
746 if (convert_value == null){
752 // We cannot rely on build-in type conversions as they are
753 // more limited than what C# supports.
754 // See char -> float/decimal/double conversion
758 if (targetType == TypeManager.bool_type)
759 return convert_value.ToBoolean (nf_provider);
760 if (targetType == TypeManager.byte_type)
761 return convert_value.ToByte (nf_provider);
762 if (targetType == TypeManager.char_type)
763 return convert_value.ToChar (nf_provider);
764 if (targetType == TypeManager.short_type)
765 return convert_value.ToInt16 (nf_provider);
766 if (targetType == TypeManager.int32_type)
767 return convert_value.ToInt32 (nf_provider);
768 if (targetType == TypeManager.int64_type)
769 return convert_value.ToInt64 (nf_provider);
770 if (targetType == TypeManager.sbyte_type)
771 return convert_value.ToSByte (nf_provider);
773 if (targetType == TypeManager.decimal_type) {
774 if (convert_value.GetType () == typeof (char))
775 return (decimal) convert_value.ToInt32 (nf_provider);
776 return convert_value.ToDecimal (nf_provider);
779 if (targetType == TypeManager.double_type) {
780 if (convert_value.GetType () == typeof (char))
781 return (double) convert_value.ToInt32 (nf_provider);
782 return convert_value.ToDouble (nf_provider);
785 if (targetType == TypeManager.float_type) {
786 if (convert_value.GetType () == typeof (char))
787 return (float)convert_value.ToInt32 (nf_provider);
788 return convert_value.ToSingle (nf_provider);
791 if (targetType == TypeManager.string_type)
792 return convert_value.ToString (nf_provider);
793 if (targetType == TypeManager.ushort_type)
794 return convert_value.ToUInt16 (nf_provider);
795 if (targetType == TypeManager.uint32_type)
796 return convert_value.ToUInt32 (nf_provider);
797 if (targetType == TypeManager.uint64_type)
798 return convert_value.ToUInt64 (nf_provider);
799 if (targetType == TypeManager.object_type)
810 /// Utility function that can be used to probe whether a type
811 /// is managed or not.
813 public static bool VerifyUnmanaged (CompilerContext ctx, TypeSpec t, Location loc)
816 t = GetElementType (t);
818 if (IsUnmanagedType (t))
821 ctx.Report.SymbolRelatedToPreviousError (t);
822 ctx.Report.Error (208, loc,
823 "Cannot take the address of, get the size of, or declare a pointer to a managed type `{0}'",
829 // This method always return false for non-generic compiler,
830 // while Type.IsGenericParameter is returned if it is supported.
831 public static bool IsGenericParameter (TypeSpec type)
833 return type.IsGenericParameter;
836 public static bool IsGenericType (TypeSpec type)
838 return type.IsGeneric;
841 // TODO: Implement correctly
842 public static bool ContainsGenericParameters (TypeSpec type)
844 return type.GetMetaInfo ().ContainsGenericParameters;
847 public static TypeSpec[] GetTypeArguments (TypeSpec t)
849 // TODO: return empty array !!
850 return t.TypeArguments;
854 /// Check whether `type' and `parent' are both instantiations of the same
855 /// generic type. Note that we do not check the type parameters here.
857 public static bool IsInstantiationOfSameGenericType (TypeSpec type, TypeSpec parent)
859 return type == parent || type.MemberDefinition == parent.MemberDefinition;
862 public static bool IsNullableType (TypeSpec t)
864 return generic_nullable_type == t.GetDefinition ();