2 // generic.cs: Generics support
4 // Authors: Martin Baulig (martin@ximian.com)
5 // Miguel de Icaza (miguel@ximian.com)
7 // Licensed under the terms of the GNU GPL
9 // (C) 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
10 // (C) 2004 Novell, Inc
13 using System.Reflection;
14 using System.Reflection.Emit;
15 using System.Globalization;
16 using System.Collections;
18 using System.Text.RegularExpressions;
20 namespace Mono.CSharp {
23 /// Abstract base class for type parameter constraints.
24 /// The type parameter can come from a generic type definition or from reflection.
26 public abstract class GenericConstraints {
27 public abstract string TypeParameter {
31 public abstract GenericParameterAttributes Attributes {
35 public bool HasConstructorConstraint {
36 get { return (Attributes & GenericParameterAttributes.DefaultConstructorConstraint) != 0; }
39 public bool HasReferenceTypeConstraint {
40 get { return (Attributes & GenericParameterAttributes.ReferenceTypeConstraint) != 0; }
43 public bool HasValueTypeConstraint {
44 get { return (Attributes & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0; }
47 public virtual bool HasClassConstraint {
48 get { return ClassConstraint != null; }
51 public abstract Type ClassConstraint {
55 public abstract Type[] InterfaceConstraints {
59 public abstract Type EffectiveBaseClass {
64 // Returns whether the type parameter is "known to be a reference type".
66 public virtual bool IsReferenceType {
68 if (HasReferenceTypeConstraint)
70 if (HasValueTypeConstraint)
73 if (ClassConstraint != null) {
74 if (ClassConstraint.IsValueType)
77 if (ClassConstraint != TypeManager.object_type)
81 foreach (Type t in InterfaceConstraints) {
82 if (!t.IsGenericParameter)
85 GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
86 if ((gc != null) && gc.IsReferenceType)
95 // Returns whether the type parameter is "known to be a value type".
97 public virtual bool IsValueType {
99 if (HasValueTypeConstraint)
101 if (HasReferenceTypeConstraint)
104 if (ClassConstraint != null) {
105 if (!ClassConstraint.IsValueType)
108 if (ClassConstraint != TypeManager.value_type)
112 foreach (Type t in InterfaceConstraints) {
113 if (!t.IsGenericParameter)
116 GenericConstraints gc = TypeManager.GetTypeParameterConstraints (t);
117 if ((gc != null) && gc.IsValueType)
126 public enum SpecialConstraint
134 /// Tracks the constraints for a type parameter from a generic type definition.
136 public class Constraints : GenericConstraints {
138 ArrayList constraints;
142 // name is the identifier, constraints is an arraylist of
143 // Expressions (with types) or `true' for the constructor constraint.
145 public Constraints (string name, ArrayList constraints,
149 this.constraints = constraints;
153 public override string TypeParameter {
159 GenericParameterAttributes attrs;
160 TypeExpr class_constraint;
161 ArrayList iface_constraints;
162 ArrayList type_param_constraints;
164 Type class_constraint_type;
165 Type[] iface_constraint_types;
166 Type effective_base_type;
171 /// Resolve the constraints - but only resolve things into Expression's, not
172 /// into actual types.
174 public bool Resolve (EmitContext ec)
179 iface_constraints = new ArrayList ();
180 type_param_constraints = new ArrayList ();
182 foreach (object obj in constraints) {
183 if (HasConstructorConstraint) {
184 Report.Error (401, loc,
185 "The new() constraint must be last.");
189 if (obj is SpecialConstraint) {
190 SpecialConstraint sc = (SpecialConstraint) obj;
192 if (sc == SpecialConstraint.Constructor) {
193 if (!HasValueTypeConstraint) {
194 attrs |= GenericParameterAttributes.DefaultConstructorConstraint;
199 451, loc, "The new () constraint " +
200 "cannot be used with the `struct' " +
205 if ((num_constraints > 0) || HasReferenceTypeConstraint || HasValueTypeConstraint) {
206 Report.Error (449, loc,
207 "The `class' or `struct' " +
208 "constraint must be first");
212 if (sc == SpecialConstraint.ReferenceType)
213 attrs |= GenericParameterAttributes.ReferenceTypeConstraint;
215 attrs |= GenericParameterAttributes.NotNullableValueTypeConstraint;
219 int errors = Report.Errors;
220 FullNamedExpression fn = ((Expression) obj).ResolveAsTypeStep (ec);
223 if (errors != Report.Errors)
226 Report.Error (246, loc, "Cannot find type '{0}'", ((Expression) obj).GetSignatureForError ());
231 ConstructedType cexpr = fn as ConstructedType;
233 if (!cexpr.ResolveConstructedType (ec))
238 expr = fn.ResolveAsTypeTerminal (ec);
240 if ((expr == null) || (expr.Type == null))
243 TypeParameterExpr texpr = expr as TypeParameterExpr;
245 type_param_constraints.Add (expr);
246 else if (expr.IsInterface)
247 iface_constraints.Add (expr);
248 else if (class_constraint != null) {
249 Report.Error (406, loc,
250 "`{0}': the class constraint for `{1}' " +
251 "must come before any other constraints.",
254 } else if (HasReferenceTypeConstraint || HasValueTypeConstraint) {
255 Report.Error (450, loc, "`{0}': cannot specify both " +
256 "a constraint class and the `class' " +
257 "or `struct' constraint.", expr.Name);
260 class_constraint = expr;
265 ArrayList list = new ArrayList ();
266 foreach (TypeExpr iface_constraint in iface_constraints) {
267 foreach (Type type in list) {
268 if (!type.Equals (iface_constraint.Type))
271 Report.Error (405, loc,
272 "Duplicate constraint `{0}' for type " +
273 "parameter `{1}'.", iface_constraint.GetSignatureForError (),
278 list.Add (iface_constraint.Type);
281 foreach (TypeParameterExpr expr in type_param_constraints) {
282 foreach (Type type in list) {
283 if (!type.Equals (expr.Type))
286 Report.Error (405, loc,
287 "Duplicate constraint `{0}' for type " +
288 "parameter `{1}'.", expr.GetSignatureForError (), name);
292 list.Add (expr.Type);
295 iface_constraint_types = new Type [list.Count];
296 list.CopyTo (iface_constraint_types, 0);
298 if (class_constraint != null) {
299 class_constraint_type = class_constraint.Type;
300 if (class_constraint_type == null)
303 if (class_constraint_type.IsSealed) {
304 Report.Error (701, loc,
305 "`{0}' is not a valid bound. Bounds " +
306 "must be interfaces or non sealed " +
307 "classes", TypeManager.CSharpName (class_constraint_type));
311 if ((class_constraint_type == TypeManager.array_type) ||
312 (class_constraint_type == TypeManager.delegate_type) ||
313 (class_constraint_type == TypeManager.enum_type) ||
314 (class_constraint_type == TypeManager.value_type) ||
315 (class_constraint_type == TypeManager.object_type)) {
316 Report.Error (702, loc,
317 "Bound cannot be special class `{0}'",
318 TypeManager.CSharpName (class_constraint_type));
323 if (class_constraint_type != null)
324 effective_base_type = class_constraint_type;
325 else if (HasValueTypeConstraint)
326 effective_base_type = TypeManager.value_type;
328 effective_base_type = TypeManager.object_type;
334 bool CheckTypeParameterConstraints (TypeParameter tparam, Hashtable seen)
336 seen.Add (tparam, true);
338 Constraints constraints = tparam.Constraints;
339 if (constraints == null)
342 if (constraints.HasValueTypeConstraint) {
343 Report.Error (456, loc, "Type parameter `{0}' has " +
344 "the `struct' constraint, so it cannot " +
345 "be used as a constraint for `{1}'",
350 if (constraints.type_param_constraints == null)
353 foreach (TypeParameterExpr expr in constraints.type_param_constraints) {
354 if (seen.Contains (expr.TypeParameter)) {
355 Report.Error (454, loc, "Circular constraint " +
356 "dependency involving `{0}' and `{1}'",
357 tparam.Name, expr.Name);
361 if (!CheckTypeParameterConstraints (expr.TypeParameter, seen))
369 /// Resolve the constraints into actual types.
371 public bool ResolveTypes (EmitContext ec)
376 resolved_types = true;
378 foreach (object obj in constraints) {
379 ConstructedType cexpr = obj as ConstructedType;
383 if (!cexpr.CheckConstraints (ec))
387 foreach (TypeParameterExpr expr in type_param_constraints) {
388 Hashtable seen = new Hashtable ();
389 if (!CheckTypeParameterConstraints (expr.TypeParameter, seen))
393 foreach (TypeExpr iface_constraint in iface_constraints) {
394 if (iface_constraint.ResolveType (ec) == null)
398 if (class_constraint != null) {
399 if (class_constraint.ResolveType (ec) == null)
407 /// Check whether there are no conflicts in our type parameter constraints.
409 /// This is an example:
413 /// where U : T, struct
415 public bool CheckDependencies (EmitContext ec)
417 foreach (TypeParameterExpr expr in type_param_constraints) {
418 if (!CheckDependencies (expr.TypeParameter, ec))
425 bool CheckDependencies (TypeParameter tparam, EmitContext ec)
427 Constraints constraints = tparam.Constraints;
428 if (constraints == null)
431 if (HasValueTypeConstraint && constraints.HasClassConstraint) {
432 Report.Error (455, loc, "Type parameter `{0}' inherits " +
433 "conflicting constraints `{1}' and `{2}'",
434 name, TypeManager.CSharpName (constraints.ClassConstraint),
439 if (HasClassConstraint && constraints.HasClassConstraint) {
440 Type t1 = ClassConstraint;
441 TypeExpr e1 = class_constraint;
442 Type t2 = constraints.ClassConstraint;
443 TypeExpr e2 = constraints.class_constraint;
445 if (!Convert.ImplicitReferenceConversionExists (ec, e1, t2) &&
446 !Convert.ImplicitReferenceConversionExists (ec, e2, t1)) {
447 Report.Error (455, loc,
448 "Type parameter `{0}' inherits " +
449 "conflicting constraints `{1}' and `{2}'",
450 name, TypeManager.CSharpName (t1), TypeManager.CSharpName (t2));
455 if (constraints.type_param_constraints == null)
458 foreach (TypeParameterExpr expr in constraints.type_param_constraints) {
459 if (!CheckDependencies (expr.TypeParameter, ec))
466 public override GenericParameterAttributes Attributes {
467 get { return attrs; }
470 public override bool HasClassConstraint {
471 get { return class_constraint != null; }
474 public override Type ClassConstraint {
475 get { return class_constraint_type; }
478 public override Type[] InterfaceConstraints {
479 get { return iface_constraint_types; }
482 public override Type EffectiveBaseClass {
483 get { return effective_base_type; }
486 public bool IsSubclassOf (Type t)
488 if ((class_constraint_type != null) &&
489 class_constraint_type.IsSubclassOf (t))
492 if (iface_constraint_types == null)
495 foreach (Type iface in iface_constraint_types) {
496 if (TypeManager.IsSubclassOf (iface, t))
504 /// This is used when we're implementing a generic interface method.
505 /// Each method type parameter in implementing method must have the same
506 /// constraints than the corresponding type parameter in the interface
507 /// method. To do that, we're called on each of the implementing method's
510 public bool CheckInterfaceMethod (EmitContext ec, GenericConstraints gc)
512 if (gc.Attributes != attrs)
515 if (HasClassConstraint != gc.HasClassConstraint)
517 if (HasClassConstraint && !TypeManager.IsEqual (gc.ClassConstraint, ClassConstraint))
520 int gc_icount = gc.InterfaceConstraints != null ?
521 gc.InterfaceConstraints.Length : 0;
522 int icount = InterfaceConstraints != null ?
523 InterfaceConstraints.Length : 0;
525 if (gc_icount != icount)
528 foreach (Type iface in gc.InterfaceConstraints) {
530 foreach (Type check in InterfaceConstraints) {
531 if (TypeManager.IsEqual (iface, check)) {
546 /// A type parameter from a generic type definition.
548 public class TypeParameter : MemberCore, IMemberContainer {
551 GenericConstraints gc;
552 Constraints constraints;
554 GenericTypeParameterBuilder type;
556 public TypeParameter (DeclSpace parent, DeclSpace decl, string name,
557 Constraints constraints, Attributes attrs, Location loc)
558 : base (parent, new MemberName (name, loc), attrs)
562 this.constraints = constraints;
566 public GenericConstraints GenericConstraints {
568 return gc != null ? gc : constraints;
572 public Constraints Constraints {
578 public bool HasConstructorConstraint {
580 if (constraints != null)
581 return constraints.HasConstructorConstraint;
587 public DeclSpace DeclSpace {
600 /// This is the first method which is called during the resolving
601 /// process; we're called immediately after creating the type parameters
602 /// with SRE (by calling `DefineGenericParameters()' on the TypeBuilder /
605 /// We're either called from TypeContainer.DefineType() or from
606 /// GenericMethod.Define() (called from Method.Define()).
608 public void Define (GenericTypeParameterBuilder type)
610 if (this.type != null)
611 throw new InvalidOperationException ();
614 TypeManager.AddTypeParameter (type, this);
618 /// This is the second method which is called during the resolving
619 /// process - in case of class type parameters, we're called from
620 /// TypeContainer.ResolveType() - after it resolved the class'es
621 /// base class and interfaces. For method type parameters, we're
622 /// called immediately after Define().
624 /// We're just resolving the constraints into expressions here, we
625 /// don't resolve them into actual types.
627 /// Note that in the special case of partial generic classes, we may be
628 /// called _before_ Define() and we may also be called multiple types.
630 public bool Resolve (DeclSpace ds)
632 if (constraints != null) {
633 if (!constraints.Resolve (ds.EmitContext)) {
643 /// This is the third method which is called during the resolving
644 /// process. We're called immediately after calling DefineConstraints()
645 /// on all of the current class'es type parameters.
647 /// Our job is to resolve the constraints to actual types.
649 /// Note that we may have circular dependencies on type parameters - this
650 /// is why Resolve() and ResolveType() are separate.
652 public bool ResolveType (EmitContext ec)
654 if (constraints != null) {
655 if (!constraints.ResolveTypes (ec)) {
665 /// This is the fourth and last method which is called during the resolving
666 /// process. We're called after everything is fully resolved and actually
667 /// register the constraints with SRE and the TypeManager.
669 public bool DefineType (EmitContext ec)
671 return DefineType (ec, null, null, false);
675 /// This is the fith and last method which is called during the resolving
676 /// process. We're called after everything is fully resolved and actually
677 /// register the constraints with SRE and the TypeManager.
679 /// The `builder', `implementing' and `is_override' arguments are only
680 /// applicable to method type parameters.
682 public bool DefineType (EmitContext ec, MethodBuilder builder,
683 MethodInfo implementing, bool is_override)
685 if (!ResolveType (ec))
688 if (implementing != null) {
689 if (is_override && (constraints != null)) {
691 460, loc, "Constraints for override and " +
692 "explicit interface implementation methods " +
693 "are inherited from the base method so they " +
694 "cannot be specified directly");
698 MethodBase mb = implementing;
699 if (mb.Mono_IsInflatedMethod)
700 mb = mb.GetGenericMethodDefinition ();
702 int pos = type.GenericParameterPosition;
703 Type mparam = mb.GetGenericArguments () [pos];
704 GenericConstraints temp_gc = ReflectionConstraints.GetConstraints (mparam);
707 gc = new InflatedConstraints (temp_gc, implementing.DeclaringType);
708 else if (constraints != null)
709 gc = new InflatedConstraints (constraints, implementing.DeclaringType);
712 if (constraints != null) {
715 else if (!constraints.CheckInterfaceMethod (ec, gc))
718 if (!is_override && (temp_gc != null))
723 Report.SymbolRelatedToPreviousError (implementing);
726 425, loc, "The constraints for type " +
727 "parameter `{0}' of method `{1}' must match " +
728 "the constraints for type parameter `{2}' " +
729 "of interface method `{3}'. Consider using " +
730 "an explicit interface implementation instead",
731 Name, TypeManager.CSharpSignature (builder),
732 TypeManager.CSharpName (mparam), TypeManager.CSharpSignature (mb));
735 } else if (DeclSpace is Iterator) {
736 TypeParameter[] tparams = DeclSpace.TypeParameters;
737 Type[] types = new Type [tparams.Length];
738 for (int i = 0; i < tparams.Length; i++)
739 types [i] = tparams [i].Type;
741 if (constraints != null)
742 gc = new InflatedConstraints (constraints, types);
744 gc = (GenericConstraints) constraints;
750 if (gc.HasClassConstraint)
751 type.SetBaseTypeConstraint (gc.ClassConstraint);
753 type.SetInterfaceConstraints (gc.InterfaceConstraints);
754 type.SetGenericParameterAttributes (gc.Attributes);
755 TypeManager.RegisterBuilder (type, gc.InterfaceConstraints);
761 /// Check whether there are no conflicts in our type parameter constraints.
763 /// This is an example:
767 /// where U : T, struct
769 public bool CheckDependencies (EmitContext ec)
771 if (constraints != null)
772 return constraints.CheckDependencies (ec);
778 /// This is called for each part of a partial generic type definition.
780 /// If `new_constraints' is not null and we don't already have constraints,
781 /// they become our constraints. If we already have constraints, we must
782 /// check that they're the same.
785 public bool UpdateConstraints (EmitContext ec, Constraints new_constraints)
788 throw new InvalidOperationException ();
790 if (constraints == null) {
791 new_constraints = constraints;
793 } else if (new_constraints == null)
796 if (!new_constraints.Resolve (ec))
798 if (!new_constraints.ResolveTypes (ec))
801 return constraints.CheckInterfaceMethod (ec, new_constraints);
804 public void EmitAttributes (EmitContext ec)
806 if (OptAttributes != null)
807 OptAttributes.Emit (ec, this);
810 public override string DocCommentHeader {
812 throw new InvalidOperationException (
813 "Unexpected attempt to get doc comment from " + this.GetType () + ".");
821 public override bool Define ()
826 public override void ApplyAttributeBuilder (Attribute a,
827 CustomAttributeBuilder cb)
829 type.SetCustomAttribute (cb);
832 public override AttributeTargets AttributeTargets {
834 return (AttributeTargets) AttributeTargets.GenericParameter;
838 public override string[] ValidAttributeTargets {
840 return new string [] { "type parameter" };
848 string IMemberContainer.Name {
852 MemberCache IMemberContainer.BaseCache {
856 bool IMemberContainer.IsInterface {
860 MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
862 return FindMembers (mt, bf, null, null);
865 MemberCache IMemberContainer.MemberCache {
869 public MemberList FindMembers (MemberTypes mt, BindingFlags bf,
870 MemberFilter filter, object criteria)
872 if (constraints == null)
873 return MemberList.Empty;
875 ArrayList members = new ArrayList ();
877 if (gc.HasClassConstraint) {
878 MemberList list = TypeManager.FindMembers (
879 gc.ClassConstraint, mt, bf, filter, criteria);
881 members.AddRange (list);
884 Type[] ifaces = TypeManager.ExpandInterfaces (gc.InterfaceConstraints);
885 foreach (Type t in ifaces) {
886 MemberList list = TypeManager.FindMembers (
887 t, mt, bf, filter, criteria);
889 members.AddRange (list);
892 return new MemberList (members);
895 public bool IsSubclassOf (Type t)
900 if (constraints != null)
901 return constraints.IsSubclassOf (t);
906 public override string ToString ()
908 return "TypeParameter[" + name + "]";
911 public static string GetSignatureForError (TypeParameter[] tp)
913 if (tp == null || tp.Length == 0)
916 StringBuilder sb = new StringBuilder ("<");
917 for (int i = 0; i < tp.Length; ++i) {
920 sb.Append (tp[i].GetSignatureForError ());
923 return sb.ToString ();
926 public void InflateConstraints (Type declaring)
928 if (constraints != null)
929 gc = new InflatedConstraints (constraints, declaring);
932 protected class InflatedConstraints : GenericConstraints
934 GenericConstraints gc;
936 Type class_constraint;
937 Type[] iface_constraints;
940 public InflatedConstraints (GenericConstraints gc, Type declaring)
941 : this (gc, TypeManager.GetTypeArguments (declaring))
944 public InflatedConstraints (GenericConstraints gc, Type[] dargs)
949 ArrayList list = new ArrayList ();
950 if (gc.HasClassConstraint)
951 list.Add (inflate (gc.ClassConstraint));
952 foreach (Type iface in gc.InterfaceConstraints)
953 list.Add (inflate (iface));
955 bool has_class_constr = false;
956 if (list.Count > 0) {
957 Type first = (Type) list [0];
958 has_class_constr = !first.IsInterface && !first.IsGenericParameter;
961 if ((list.Count > 0) && has_class_constr) {
962 class_constraint = (Type) list [0];
963 iface_constraints = new Type [list.Count - 1];
964 list.CopyTo (1, iface_constraints, 0, list.Count - 1);
966 iface_constraints = new Type [list.Count];
967 list.CopyTo (iface_constraints, 0);
970 if (HasValueTypeConstraint)
971 base_type = TypeManager.value_type;
972 else if (class_constraint != null)
973 base_type = class_constraint;
975 base_type = TypeManager.object_type;
978 Type inflate (Type t)
982 if (t.IsGenericParameter)
983 return dargs [t.GenericParameterPosition];
984 if (t.IsGenericInstance) {
985 t = t.GetGenericTypeDefinition ();
986 t = t.MakeGenericType (dargs);
992 public override string TypeParameter {
993 get { return gc.TypeParameter; }
996 public override GenericParameterAttributes Attributes {
997 get { return gc.Attributes; }
1000 public override Type ClassConstraint {
1001 get { return class_constraint; }
1004 public override Type EffectiveBaseClass {
1005 get { return base_type; }
1008 public override Type[] InterfaceConstraints {
1009 get { return iface_constraints; }
1015 /// A TypeExpr which already resolved to a type parameter.
1017 public class TypeParameterExpr : TypeExpr {
1018 TypeParameter type_parameter;
1020 public override string Name {
1022 return type_parameter.Name;
1026 public override string FullName {
1028 return type_parameter.Name;
1032 public TypeParameter TypeParameter {
1034 return type_parameter;
1038 public TypeParameterExpr (TypeParameter type_parameter, Location loc)
1040 this.type_parameter = type_parameter;
1044 protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
1046 type = type_parameter.Type;
1051 public override bool IsInterface {
1052 get { return false; }
1055 public override bool CheckAccessLevel (DeclSpace ds)
1060 public void Error_CannotUseAsUnmanagedType (Location loc)
1062 Report.Error (-203, loc, "Can not use type parameter as unamanged type");
1067 /// Tracks the type arguments when instantiating a generic type. We're used in
1068 /// ConstructedType.
1070 public class TypeArguments {
1071 public readonly Location Location;
1078 public TypeArguments (Location loc)
1080 args = new ArrayList ();
1081 this.Location = loc;
1084 public TypeArguments (int dimension, Location loc)
1086 this.dimension = dimension;
1087 this.Location = loc;
1090 public void Add (Expression type)
1093 throw new InvalidOperationException ();
1098 public void Add (TypeArguments new_args)
1101 throw new InvalidOperationException ();
1103 args.AddRange (new_args.args);
1107 /// We're used during the parsing process: the parser can't distinguish
1108 /// between type parameters and type arguments. Because of that, the
1109 /// parser creates a `MemberName' with `TypeArguments' for both cases and
1110 /// in case of a generic type definition, we call GetDeclarations().
1112 public TypeParameterName[] GetDeclarations ()
1114 TypeParameterName[] ret = new TypeParameterName [args.Count];
1115 for (int i = 0; i < args.Count; i++) {
1116 TypeParameterName name = args [i] as TypeParameterName;
1121 SimpleName sn = args [i] as SimpleName;
1123 ret [i] = new TypeParameterName (sn.Name, null, sn.Location);
1127 Report.Error (81, Location, "Type parameter declaration " +
1128 "must be an identifier not a type");
1135 /// We may only be used after Resolve() is called and return the fully
1138 public Type[] Arguments {
1144 public bool HasTypeArguments {
1146 return has_type_args;
1159 public bool IsUnbound {
1161 return dimension > 0;
1165 public override string ToString ()
1167 StringBuilder s = new StringBuilder ();
1170 for (int i = 0; i < count; i++){
1172 // FIXME: Use TypeManager.CSharpname once we have the type
1175 s.Append (args [i].ToString ());
1179 return s.ToString ();
1183 /// Resolve the type arguments.
1185 public bool Resolve (EmitContext ec)
1187 int count = args.Count;
1190 atypes = new Type [count];
1192 for (int i = 0; i < count; i++){
1193 TypeExpr te = ((Expression) args [i]).ResolveAsTypeTerminal (ec);
1198 if (te is TypeParameterExpr)
1199 has_type_args = true;
1201 if (te.Type.IsPointer) {
1202 Report.Error (306, Location, "The type `{0}' may not be used " +
1203 "as a type argument.", TypeManager.CSharpName (te.Type));
1205 } else if (te.Type == TypeManager.void_type) {
1206 Report.Error (1547, Location,
1207 "Keyword `void' cannot be used in this context");
1211 atypes [i] = te.Type;
1217 public class TypeParameterName : SimpleName
1219 Attributes attributes;
1221 public TypeParameterName (string name, Attributes attrs, Location loc)
1227 public Attributes OptAttributes {
1235 /// An instantiation of a generic type.
1237 public class ConstructedType : TypeExpr {
1239 FullNamedExpression name;
1241 Type[] gen_params, atypes;
1245 /// Instantiate the generic type `fname' with the type arguments `args'.
1247 public ConstructedType (FullNamedExpression fname, TypeArguments args, Location l)
1253 eclass = ExprClass.Type;
1254 full_name = name + "<" + args.ToString () + ">";
1257 protected ConstructedType (TypeArguments args, Location l)
1262 eclass = ExprClass.Type;
1265 protected ConstructedType (TypeParameter[] type_params, Location l)
1269 args = new TypeArguments (l);
1270 foreach (TypeParameter type_param in type_params)
1271 args.Add (new TypeParameterExpr (type_param, l));
1273 eclass = ExprClass.Type;
1277 /// This is used to construct the `this' type inside a generic type definition.
1279 public ConstructedType (Type t, TypeParameter[] type_params, Location l)
1280 : this (type_params, l)
1282 gt = t.GetGenericTypeDefinition ();
1284 this.name = new TypeExpression (gt, l);
1285 full_name = gt.FullName + "<" + args.ToString () + ">";
1289 /// Instantiate the generic type `t' with the type arguments `args'.
1290 /// Use this constructor if you already know the fully resolved
1293 public ConstructedType (Type t, TypeArguments args, Location l)
1296 gt = t.GetGenericTypeDefinition ();
1298 this.name = new TypeExpression (gt, l);
1299 full_name = gt.FullName + "<" + args.ToString () + ">";
1302 public TypeArguments TypeArguments {
1303 get { return args; }
1306 public override string GetSignatureForError ()
1308 return TypeManager.CSharpName (gt);
1311 protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
1313 if (!ResolveConstructedType (ec))
1320 /// Check the constraints; we're called from ResolveAsTypeTerminal()
1321 /// after fully resolving the constructed type.
1323 public bool CheckConstraints (EmitContext ec)
1325 return ConstraintChecker.CheckConstraints (ec, gt, gen_params, atypes, loc);
1329 /// Resolve the constructed type, but don't check the constraints.
1331 public bool ResolveConstructedType (EmitContext ec)
1335 // If we already know the fully resolved generic type.
1337 return DoResolveType (ec);
1343 Report.Error (246, loc, "Cannot find type `{0}'<...>", Name);
1347 num_args = TypeManager.GetNumberOfTypeArguments (t);
1348 if (num_args == 0) {
1349 Report.Error (308, loc,
1350 "The non-generic type `{0}' cannot " +
1351 "be used with type arguments.",
1352 TypeManager.CSharpName (t));
1356 gt = t.GetGenericTypeDefinition ();
1357 return DoResolveType (ec);
1360 bool DoResolveType (EmitContext ec)
1363 // Resolve the arguments.
1365 if (args.Resolve (ec) == false)
1368 gen_params = gt.GetGenericArguments ();
1369 atypes = args.Arguments;
1371 if (atypes.Length != gen_params.Length) {
1372 Report.Error (305, loc,
1373 "Using the generic type `{0}' " +
1374 "requires {1} type arguments",
1375 TypeManager.CSharpName (gt),
1376 gen_params.Length.ToString ());
1381 // Now bind the parameters.
1383 type = gt.MakeGenericType (atypes);
1387 public Expression GetSimpleName (EmitContext ec)
1392 public override bool CheckAccessLevel (DeclSpace ds)
1394 return ds.CheckAccessLevel (gt);
1397 public override bool AsAccessible (DeclSpace ds, int flags)
1399 return ds.AsAccessible (gt, flags);
1402 public override bool IsClass {
1403 get { return gt.IsClass; }
1406 public override bool IsValueType {
1407 get { return gt.IsValueType; }
1410 public override bool IsInterface {
1411 get { return gt.IsInterface; }
1414 public override bool IsSealed {
1415 get { return gt.IsSealed; }
1418 public override bool Equals (object obj)
1420 ConstructedType cobj = obj as ConstructedType;
1424 if ((type == null) || (cobj.type == null))
1427 return type == cobj.type;
1430 public override int GetHashCode ()
1432 return base.GetHashCode ();
1435 public override string Name {
1442 public override string FullName {
1449 public abstract class ConstraintChecker
1451 protected readonly Type[] gen_params;
1452 protected readonly Type[] atypes;
1453 protected readonly Location loc;
1455 protected ConstraintChecker (Type[] gen_params, Type[] atypes, Location loc)
1457 this.gen_params = gen_params;
1458 this.atypes = atypes;
1463 /// Check the constraints; we're called from ResolveAsTypeTerminal()
1464 /// after fully resolving the constructed type.
1466 public bool CheckConstraints (EmitContext ec)
1468 for (int i = 0; i < gen_params.Length; i++) {
1469 if (!CheckConstraints (ec, i))
1476 protected bool CheckConstraints (EmitContext ec, int index)
1478 Type atype = atypes [index];
1479 Type ptype = gen_params [index];
1484 Expression aexpr = new EmptyExpression (atype);
1486 GenericConstraints gc = TypeManager.GetTypeParameterConstraints (ptype);
1490 bool is_class, is_struct;
1491 if (atype.IsGenericParameter) {
1492 GenericConstraints agc = TypeManager.GetTypeParameterConstraints (atype);
1494 is_class = agc.HasReferenceTypeConstraint;
1495 is_struct = agc.HasValueTypeConstraint;
1497 is_class = is_struct = false;
1500 is_class = atype.IsClass || atype.IsInterface;
1501 is_struct = atype.IsValueType && !TypeManager.IsNullableType (atype);
1505 // First, check the `class' and `struct' constraints.
1507 if (gc.HasReferenceTypeConstraint && !is_class) {
1508 Report.Error (452, loc, "The type `{0}' must be " +
1509 "a reference type in order to use it " +
1510 "as type parameter `{1}' in the " +
1511 "generic type or method `{2}'.",
1512 TypeManager.CSharpName (atype),
1513 TypeManager.CSharpName (ptype),
1514 GetSignatureForError ());
1516 } else if (gc.HasValueTypeConstraint && !is_struct) {
1517 Report.Error (453, loc, "The type `{0}' must be a " +
1518 "non-nullable value type in order to use it " +
1519 "as type parameter `{1}' in the " +
1520 "generic type or method `{2}'.",
1521 TypeManager.CSharpName (atype),
1522 TypeManager.CSharpName (ptype),
1523 GetSignatureForError ());
1528 // The class constraint comes next.
1530 if (gc.HasClassConstraint) {
1531 if (!CheckConstraint (ec, ptype, aexpr, gc.ClassConstraint))
1536 // Now, check the interface constraints.
1538 foreach (Type it in gc.InterfaceConstraints) {
1539 if (!CheckConstraint (ec, ptype, aexpr, it))
1544 // Finally, check the constructor constraint.
1547 if (!gc.HasConstructorConstraint)
1550 if (TypeManager.IsBuiltinType (atype) || atype.IsValueType)
1553 if (HasDefaultConstructor (ec, atype))
1556 Report_SymbolRelatedToPreviousError ();
1557 Report.SymbolRelatedToPreviousError (atype);
1558 Report.Error (310, loc, "The type `{0}' must have a public " +
1559 "parameterless constructor in order to use it " +
1560 "as parameter `{1}' in the generic type or " +
1562 TypeManager.CSharpName (atype),
1563 TypeManager.CSharpName (ptype),
1564 GetSignatureForError ());
1568 protected bool CheckConstraint (EmitContext ec, Type ptype, Expression expr,
1571 if (TypeManager.HasGenericArguments (ctype)) {
1572 Type[] types = TypeManager.GetTypeArguments (ctype);
1574 TypeArguments new_args = new TypeArguments (loc);
1576 for (int i = 0; i < types.Length; i++) {
1579 if (t.IsGenericParameter) {
1580 int pos = t.GenericParameterPosition;
1583 new_args.Add (new TypeExpression (t, loc));
1586 TypeExpr ct = new ConstructedType (ctype, new_args, loc);
1587 if (ct.ResolveAsTypeStep (ec) == null)
1590 } else if (ctype.IsGenericParameter) {
1591 int pos = ctype.GenericParameterPosition;
1592 ctype = atypes [pos];
1595 if (Convert.ImplicitStandardConversionExists (ec, expr, ctype))
1598 Error_TypeMustBeConvertible (expr.Type, ctype, ptype);
1602 bool HasDefaultConstructor (EmitContext ec, Type atype)
1604 if (atype is TypeBuilder) {
1605 if (atype.IsAbstract)
1608 TypeContainer tc = TypeManager.LookupTypeContainer (atype);
1609 foreach (Constructor c in tc.InstanceConstructors) {
1610 if ((c.ModFlags & Modifiers.PUBLIC) == 0)
1612 if ((c.Parameters.FixedParameters != null) &&
1613 (c.Parameters.FixedParameters.Length != 0))
1615 if (c.Parameters.HasArglist || c.Parameters.HasParams)
1622 MethodGroupExpr mg = Expression.MemberLookup (
1623 ec, atype, ".ctor", MemberTypes.Constructor,
1624 BindingFlags.Public | BindingFlags.Instance |
1625 BindingFlags.DeclaredOnly, loc)
1628 if (!atype.IsAbstract && (mg != null) && mg.IsInstance) {
1629 foreach (MethodBase mb in mg.Methods) {
1630 ParameterData pd = TypeManager.GetParameterData (mb);
1639 protected abstract string GetSignatureForError ();
1640 protected abstract void Report_SymbolRelatedToPreviousError ();
1642 void Error_TypeMustBeConvertible (Type atype, Type gc, Type ptype)
1644 Report_SymbolRelatedToPreviousError ();
1645 Report.SymbolRelatedToPreviousError (atype);
1646 Report.Error (309, loc,
1647 "The type `{0}' must be convertible to `{1}' in order to " +
1648 "use it as parameter `{2}' in the generic type or method `{3}'",
1649 TypeManager.CSharpName (atype), TypeManager.CSharpName (gc),
1650 TypeManager.CSharpName (ptype), GetSignatureForError ());
1653 public static bool CheckConstraints (EmitContext ec, MethodBase definition,
1654 MethodBase instantiated, Location loc)
1656 MethodConstraintChecker checker = new MethodConstraintChecker (
1657 definition, definition.GetGenericArguments (),
1658 instantiated.GetGenericArguments (), loc);
1660 return checker.CheckConstraints (ec);
1663 public static bool CheckConstraints (EmitContext ec, Type gt, Type[] gen_params,
1664 Type[] atypes, Location loc)
1666 TypeConstraintChecker checker = new TypeConstraintChecker (
1667 gt, gen_params, atypes, loc);
1669 return checker.CheckConstraints (ec);
1672 protected class MethodConstraintChecker : ConstraintChecker
1674 MethodBase definition;
1676 public MethodConstraintChecker (MethodBase definition, Type[] gen_params,
1677 Type[] atypes, Location loc)
1678 : base (gen_params, atypes, loc)
1680 this.definition = definition;
1683 protected override string GetSignatureForError ()
1685 return TypeManager.CSharpSignature (definition);
1688 protected override void Report_SymbolRelatedToPreviousError ()
1690 Report.SymbolRelatedToPreviousError (definition);
1694 protected class TypeConstraintChecker : ConstraintChecker
1698 public TypeConstraintChecker (Type gt, Type[] gen_params, Type[] atypes,
1700 : base (gen_params, atypes, loc)
1705 protected override string GetSignatureForError ()
1707 return TypeManager.CSharpName (gt);
1710 protected override void Report_SymbolRelatedToPreviousError ()
1712 Report.SymbolRelatedToPreviousError (gt);
1718 /// A generic method definition.
1720 public class GenericMethod : DeclSpace
1722 Expression return_type;
1723 Parameters parameters;
1725 public GenericMethod (NamespaceEntry ns, TypeContainer parent, MemberName name,
1726 Expression return_type, Parameters parameters)
1727 : base (ns, parent, name, null)
1729 this.return_type = return_type;
1730 this.parameters = parameters;
1733 public override TypeBuilder DefineType ()
1735 throw new Exception ();
1738 public override bool Define ()
1740 ec = new EmitContext (this, this, Location, null, null, ModFlags, false);
1742 for (int i = 0; i < TypeParameters.Length; i++)
1743 if (!TypeParameters [i].Resolve (this))
1750 /// Define and resolve the type parameters.
1751 /// We're called from Method.Define().
1753 public bool Define (MethodBuilder mb)
1755 GenericTypeParameterBuilder[] gen_params;
1756 TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1757 string[] snames = new string [names.Length];
1758 for (int i = 0; i < names.Length; i++)
1759 snames [i] = names [i].Name;
1760 gen_params = mb.DefineGenericParameters (snames);
1761 for (int i = 0; i < TypeParameters.Length; i++)
1762 TypeParameters [i].Define (gen_params [i]);
1767 for (int i = 0; i < TypeParameters.Length; i++) {
1768 if (!TypeParameters [i].ResolveType (ec))
1776 /// We're called from MethodData.Define() after creating the MethodBuilder.
1778 public bool DefineType (EmitContext ec, MethodBuilder mb,
1779 MethodInfo implementing, bool is_override)
1781 for (int i = 0; i < TypeParameters.Length; i++)
1782 if (!TypeParameters [i].DefineType (
1783 ec, mb, implementing, is_override))
1787 foreach (Parameter p in parameters.FixedParameters){
1788 if (!p.Resolve (ec))
1791 if ((return_type != null) && (return_type.ResolveAsTypeTerminal (ec) == null))
1797 public void EmitAttributes (EmitContext ec)
1799 for (int i = 0; i < TypeParameters.Length; i++)
1800 TypeParameters [i].EmitAttributes (ec);
1802 if (OptAttributes != null)
1803 OptAttributes.Emit (ec, this);
1806 public override bool DefineMembers ()
1811 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1812 MemberFilter filter, object criteria)
1814 throw new Exception ();
1817 public override MemberCache MemberCache {
1823 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1825 base.ApplyAttributeBuilder (a, cb);
1828 public override AttributeTargets AttributeTargets {
1830 return AttributeTargets.Method | AttributeTargets.ReturnValue;
1834 public override string DocCommentHeader {
1835 get { return "M:"; }
1839 public class DefaultValueExpression : Expression
1843 public DefaultValueExpression (Expression expr, Location loc)
1849 public override Expression DoResolve (EmitContext ec)
1851 TypeExpr texpr = expr.ResolveAsTypeTerminal (ec);
1857 eclass = ExprClass.Variable;
1861 public override void Emit (EmitContext ec)
1863 if (type.IsGenericParameter || TypeManager.IsValueType (type)) {
1864 LocalTemporary temp_storage = new LocalTemporary (ec, type);
1866 temp_storage.AddressOf (ec, AddressOp.LoadStore);
1867 ec.ig.Emit (OpCodes.Initobj, type);
1868 temp_storage.Emit (ec);
1870 ec.ig.Emit (OpCodes.Ldnull);
1874 public class NullableType : TypeExpr
1876 Expression underlying;
1878 public NullableType (Expression underlying, Location l)
1880 this.underlying = underlying;
1883 eclass = ExprClass.Type;
1886 public NullableType (Type type, Location loc)
1887 : this (new TypeExpression (type, loc), loc)
1890 public override string Name {
1891 get { return underlying.ToString () + "?"; }
1894 public override string FullName {
1895 get { return underlying.ToString () + "?"; }
1898 protected override TypeExpr DoResolveAsTypeStep (EmitContext ec)
1900 TypeArguments args = new TypeArguments (loc);
1901 args.Add (underlying);
1903 ConstructedType ctype = new ConstructedType (TypeManager.generic_nullable_type, args, loc);
1904 return ctype.ResolveAsTypeTerminal (ec);
1908 public partial class TypeManager
1911 // A list of core types that the compiler requires or uses
1913 static public Type activator_type;
1914 static public Type generic_ienumerator_type;
1915 static public Type generic_ienumerable_type;
1916 static public Type generic_nullable_type;
1919 // Tracks the generic parameters.
1921 static PtrHashtable builder_to_type_param;
1924 // These methods are called by code generated by the compiler
1926 static public MethodInfo activator_create_instance;
1928 static void InitGenerics ()
1930 builder_to_type_param = new PtrHashtable ();
1933 static void CleanUpGenerics ()
1935 builder_to_type_param = null;
1938 static void InitGenericCoreTypes ()
1940 activator_type = CoreLookupType ("System", "Activator");
1942 generic_ienumerator_type = CoreLookupType (
1943 "System.Collections.Generic", "IEnumerator", 1);
1944 generic_ienumerable_type = CoreLookupType (
1945 "System.Collections.Generic", "IEnumerable", 1);
1946 generic_nullable_type = CoreLookupType (
1947 "System", "Nullable", 1);
1950 static void InitGenericCodeHelpers ()
1953 Type [] type_arg = { type_type };
1954 activator_create_instance = GetMethod (
1955 activator_type, "CreateInstance", type_arg);
1958 static Type CoreLookupType (string ns, string name, int arity)
1960 return CoreLookupType (ns, MemberName.MakeName (name, arity));
1963 public static void AddTypeParameter (Type t, TypeParameter tparam)
1965 if (!builder_to_type_param.Contains (t))
1966 builder_to_type_param.Add (t, tparam);
1969 public static TypeContainer LookupGenericTypeContainer (Type t)
1971 t = DropGenericTypeArguments (t);
1972 return LookupTypeContainer (t);
1975 public static TypeParameter LookupTypeParameter (Type t)
1977 return (TypeParameter) builder_to_type_param [t];
1980 public static GenericConstraints GetTypeParameterConstraints (Type t)
1982 if (!t.IsGenericParameter)
1983 throw new InvalidOperationException ();
1985 TypeParameter tparam = LookupTypeParameter (t);
1987 return tparam.GenericConstraints;
1989 return ReflectionConstraints.GetConstraints (t);
1992 public static bool HasGenericArguments (Type t)
1994 return GetNumberOfTypeArguments (t) > 0;
1997 public static int GetNumberOfTypeArguments (Type t)
1999 if (t.IsGenericParameter)
2001 DeclSpace tc = LookupDeclSpace (t);
2003 return tc.IsGeneric ? tc.CountTypeParameters : 0;
2005 return t.IsGenericType ? t.GetGenericArguments ().Length : 0;
2008 public static Type[] GetTypeArguments (Type t)
2010 DeclSpace tc = LookupDeclSpace (t);
2013 return Type.EmptyTypes;
2015 TypeParameter[] tparam = tc.TypeParameters;
2016 Type[] ret = new Type [tparam.Length];
2017 for (int i = 0; i < tparam.Length; i++) {
2018 ret [i] = tparam [i].Type;
2019 if (ret [i] == null)
2020 throw new InternalErrorException ();
2025 return t.GetGenericArguments ();
2028 public static Type DropGenericTypeArguments (Type t)
2030 if (!t.IsGenericType)
2032 // Micro-optimization: a generic typebuilder is always a generic type definition
2033 if (t is TypeBuilder)
2035 return t.GetGenericTypeDefinition ();
2039 // Whether `array' is an array of T and `enumerator' is `IEnumerable<T>'.
2040 // For instance "string[]" -> "IEnumerable<string>".
2042 public static bool IsIEnumerable (Type array, Type enumerator)
2044 if (!array.IsArray || !enumerator.IsGenericInstance)
2047 if (enumerator.GetGenericTypeDefinition () != generic_ienumerable_type)
2050 Type[] args = GetTypeArguments (enumerator);
2051 return args [0] == GetElementType (array);
2054 public static bool IsEqual (Type a, Type b)
2059 if (a.IsGenericParameter && b.IsGenericParameter) {
2060 if (a.DeclaringMethod != b.DeclaringMethod &&
2061 (a.DeclaringMethod == null || b.DeclaringMethod == null))
2063 return a.GenericParameterPosition == b.GenericParameterPosition;
2066 if (a.IsArray && b.IsArray) {
2067 if (a.GetArrayRank () != b.GetArrayRank ())
2069 return IsEqual (a.GetElementType (), b.GetElementType ());
2072 if (a.IsByRef && b.IsByRef)
2073 return IsEqual (a.GetElementType (), b.GetElementType ());
2075 if (a.IsGenericType && b.IsGenericType) {
2076 if (a.GetGenericTypeDefinition () != b.GetGenericTypeDefinition ())
2079 Type[] aargs = a.GetGenericArguments ();
2080 Type[] bargs = b.GetGenericArguments ();
2082 if (aargs.Length != bargs.Length)
2085 for (int i = 0; i < aargs.Length; i++) {
2086 if (!IsEqual (aargs [i], bargs [i]))
2094 // This is to build with the broken circular dependencies between
2095 // System and System.Configuration in the 2.x profile where we
2096 // end up with a situation where:
2098 // System on the second build is referencing the System.Configuration
2099 // that has references to the first System build.
2101 // Point in case: NameValueCollection built on the first pass, vs
2102 // NameValueCollection build on the second one. The problem is that
2103 // we need to override some methods sometimes, or we need to
2105 if (RootContext.BrokenCircularDeps){
2106 if (a.Name == b.Name && a.Namespace == b.Namespace){
2107 Console.WriteLine ("GonziMatch: {0}.{1}", a.Namespace, a.Name);
2115 /// Check whether `a' and `b' may become equal generic types.
2116 /// The algorithm to do that is a little bit complicated.
2118 public static bool MayBecomeEqualGenericTypes (Type a, Type b, Type[] class_infered,
2119 Type[] method_infered)
2121 if (a.IsGenericParameter) {
2123 // If a is an array of a's type, they may never
2127 b = b.GetElementType ();
2133 // If b is a generic parameter or an actual type,
2134 // they may become equal:
2136 // class X<T,U> : I<T>, I<U>
2137 // class X<T> : I<T>, I<float>
2139 if (b.IsGenericParameter || !b.IsGenericInstance) {
2140 int pos = a.GenericParameterPosition;
2141 Type[] args = a.DeclaringMethod != null ? method_infered : class_infered;
2142 if (args [pos] == null) {
2147 return args [pos] == a;
2151 // We're now comparing a type parameter with a
2152 // generic instance. They may become equal unless
2153 // the type parameter appears anywhere in the
2154 // generic instance:
2156 // class X<T,U> : I<T>, I<X<U>>
2157 // -> error because you could instanciate it as
2160 // class X<T> : I<T>, I<X<T>> -> ok
2163 Type[] bargs = GetTypeArguments (b);
2164 for (int i = 0; i < bargs.Length; i++) {
2165 if (a.Equals (bargs [i]))
2172 if (b.IsGenericParameter)
2173 return MayBecomeEqualGenericTypes (b, a, class_infered, method_infered);
2176 // At this point, neither a nor b are a type parameter.
2178 // If one of them is a generic instance, let
2179 // MayBecomeEqualGenericInstances() compare them (if the
2180 // other one is not a generic instance, they can never
2184 if (a.IsGenericInstance || b.IsGenericInstance)
2185 return MayBecomeEqualGenericInstances (a, b, class_infered, method_infered);
2188 // If both of them are arrays.
2191 if (a.IsArray && b.IsArray) {
2192 if (a.GetArrayRank () != b.GetArrayRank ())
2195 a = a.GetElementType ();
2196 b = b.GetElementType ();
2198 return MayBecomeEqualGenericTypes (a, b, class_infered, method_infered);
2202 // Ok, two ordinary types.
2205 return a.Equals (b);
2209 // Checks whether two generic instances may become equal for some
2210 // particular instantiation (26.3.1).
2212 public static bool MayBecomeEqualGenericInstances (Type a, Type b,
2213 Type[] class_infered,
2214 Type[] method_infered)
2216 if (!a.IsGenericInstance || !b.IsGenericInstance)
2218 if (a.GetGenericTypeDefinition () != b.GetGenericTypeDefinition ())
2221 return MayBecomeEqualGenericInstances (
2222 GetTypeArguments (a), GetTypeArguments (b), class_infered, method_infered);
2225 public static bool MayBecomeEqualGenericInstances (Type[] aargs, Type[] bargs,
2226 Type[] class_infered,
2227 Type[] method_infered)
2229 if (aargs.Length != bargs.Length)
2232 for (int i = 0; i < aargs.Length; i++) {
2233 if (!MayBecomeEqualGenericTypes (aargs [i], bargs [i], class_infered, method_infered))
2241 /// Check whether `type' and `parent' are both instantiations of the same
2242 /// generic type. Note that we do not check the type parameters here.
2244 public static bool IsInstantiationOfSameGenericType (Type type, Type parent)
2246 int tcount = GetNumberOfTypeArguments (type);
2247 int pcount = GetNumberOfTypeArguments (parent);
2249 if (tcount != pcount)
2252 type = DropGenericTypeArguments (type);
2253 parent = DropGenericTypeArguments (parent);
2255 return type.Equals (parent);
2259 /// Whether `mb' is a generic method definition.
2261 public static bool IsGenericMethodDefinition (MethodBase mb)
2263 if (mb.DeclaringType is TypeBuilder) {
2264 IMethodData method = (IMethodData) builder_to_method [mb];
2268 return method.GenericMethod != null;
2271 return mb.IsGenericMethodDefinition;
2275 /// Whether `mb' is a generic method definition.
2277 public static bool IsGenericMethod (MethodBase mb)
2279 if (mb.DeclaringType is TypeBuilder) {
2280 IMethodData method = (IMethodData) builder_to_method [mb];
2284 return method.GenericMethod != null;
2287 return mb.IsGenericMethod;
2294 static bool InferType (Type pt, Type at, Type[] infered)
2296 if (pt.IsGenericParameter && (pt.DeclaringMethod != null)) {
2297 int pos = pt.GenericParameterPosition;
2299 if (infered [pos] == null) {
2301 while (check.IsArray)
2302 check = check.GetElementType ();
2311 if (infered [pos] != at)
2317 if (!pt.ContainsGenericParameters) {
2318 if (at.ContainsGenericParameters)
2319 return InferType (at, pt, infered);
2326 (at.GetArrayRank () != pt.GetArrayRank ()))
2329 return InferType (pt.GetElementType (), at.GetElementType (), infered);
2334 (pt.GetArrayRank () != at.GetArrayRank ()))
2337 return InferType (pt.GetElementType (), at.GetElementType (), infered);
2340 if (pt.IsByRef && at.IsByRef)
2341 return InferType (pt.GetElementType (), at.GetElementType (), infered);
2342 ArrayList list = new ArrayList ();
2343 if (at.IsGenericInstance)
2345 for (Type bt = at.BaseType; bt != null; bt = bt.BaseType)
2348 list.AddRange (TypeManager.GetInterfaces (at));
2350 bool found_one = false;
2352 foreach (Type type in list) {
2353 if (!type.IsGenericInstance)
2356 Type[] infered_types = new Type [infered.Length];
2358 if (!InferGenericInstance (pt, type, infered_types))
2361 for (int i = 0; i < infered_types.Length; i++) {
2362 if (infered [i] == null) {
2363 infered [i] = infered_types [i];
2367 if (infered [i] != infered_types [i])
2377 static bool InferGenericInstance (Type pt, Type at, Type[] infered_types)
2379 Type[] at_args = at.GetGenericArguments ();
2380 Type[] pt_args = pt.GetGenericArguments ();
2382 if (at_args.Length != pt_args.Length)
2385 for (int i = 0; i < at_args.Length; i++) {
2386 if (!InferType (pt_args [i], at_args [i], infered_types))
2390 for (int i = 0; i < infered_types.Length; i++) {
2391 if (infered_types [i] == null)
2399 /// Type inference. Try to infer the type arguments from the params method
2400 /// `method', which is invoked with the arguments `arguments'. This is used
2401 /// when resolving an Invocation or a DelegateInvocation and the user
2402 /// did not explicitly specify type arguments.
2404 public static bool InferParamsTypeArguments (EmitContext ec, ArrayList arguments,
2405 ref MethodBase method)
2407 if ((arguments == null) || !TypeManager.IsGenericMethod (method))
2412 if (arguments == null)
2415 arg_count = arguments.Count;
2417 ParameterData pd = TypeManager.GetParameterData (method);
2419 int pd_count = pd.Count;
2424 if (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS)
2427 if (pd_count - 1 > arg_count)
2430 if (pd_count == 1 && arg_count == 0)
2433 Type[] method_args = method.GetGenericArguments ();
2434 Type[] infered_types = new Type [method_args.Length];
2437 // If we have come this far, the case which
2438 // remains is when the number of parameters is
2439 // less than or equal to the argument count.
2441 for (int i = 0; i < pd_count - 1; ++i) {
2442 Argument a = (Argument) arguments [i];
2444 if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
2447 Type pt = pd.ParameterType (i);
2450 if (!InferType (pt, at, infered_types))
2454 Type element_type = TypeManager.GetElementType (pd.ParameterType (pd_count - 1));
2456 for (int i = pd_count - 1; i < arg_count; i++) {
2457 Argument a = (Argument) arguments [i];
2459 if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr))
2462 if (!InferType (element_type, a.Type, infered_types))
2466 for (int i = 0; i < infered_types.Length; i++)
2467 if (infered_types [i] == null)
2470 method = ((MethodInfo)method).MakeGenericMethod (infered_types);
2474 static bool InferTypeArguments (Type[] param_types, Type[] arg_types,
2475 Type[] infered_types)
2477 if (infered_types == null)
2480 for (int i = 0; i < arg_types.Length; i++) {
2481 if (arg_types [i] == null)
2484 if (!InferType (param_types [i], arg_types [i], infered_types))
2488 for (int i = 0; i < infered_types.Length; i++)
2489 if (infered_types [i] == null)
2496 /// Type inference. Try to infer the type arguments from `method',
2497 /// which is invoked with the arguments `arguments'. This is used
2498 /// when resolving an Invocation or a DelegateInvocation and the user
2499 /// did not explicitly specify type arguments.
2501 public static bool InferTypeArguments (EmitContext ec, ArrayList arguments,
2502 ref MethodBase method)
2504 if (!TypeManager.IsGenericMethod (method))
2508 if (arguments != null)
2509 arg_count = arguments.Count;
2513 ParameterData pd = TypeManager.GetParameterData (method);
2514 if (arg_count != pd.Count)
2517 Type[] method_args = method.GetGenericArguments ();
2519 bool is_open = false;
2520 for (int i = 0; i < method_args.Length; i++) {
2521 if (method_args [i].IsGenericParameter) {
2529 Type[] infered_types = new Type [method_args.Length];
2531 Type[] param_types = new Type [pd.Count];
2532 Type[] arg_types = new Type [pd.Count];
2534 for (int i = 0; i < arg_count; i++) {
2535 param_types [i] = pd.ParameterType (i);
2537 Argument a = (Argument) arguments [i];
2538 if ((a.Expr is NullLiteral) || (a.Expr is MethodGroupExpr) ||
2539 (a.Expr is AnonymousMethod))
2542 arg_types [i] = a.Type;
2545 if (!InferTypeArguments (param_types, arg_types, infered_types))
2548 method = ((MethodInfo)method).MakeGenericMethod (infered_types);
2555 public static bool InferTypeArguments (EmitContext ec, ParameterData apd,
2556 ref MethodBase method)
2558 if (!TypeManager.IsGenericMethod (method))
2561 ParameterData pd = TypeManager.GetParameterData (method);
2562 if (apd.Count != pd.Count)
2565 Type[] method_args = method.GetGenericArguments ();
2566 Type[] infered_types = new Type [method_args.Length];
2568 Type[] param_types = new Type [pd.Count];
2569 Type[] arg_types = new Type [pd.Count];
2571 for (int i = 0; i < apd.Count; i++) {
2572 param_types [i] = pd.ParameterType (i);
2573 arg_types [i] = apd.ParameterType (i);
2576 if (!InferTypeArguments (param_types, arg_types, infered_types))
2579 method = ((MethodInfo)method).MakeGenericMethod (infered_types);
2583 public static bool IsNullableType (Type t)
2585 return generic_nullable_type == DropGenericTypeArguments (t);
2589 public abstract class Nullable
2591 protected sealed class NullableInfo
2593 public readonly Type Type;
2594 public readonly Type UnderlyingType;
2595 public readonly MethodInfo HasValue;
2596 public readonly MethodInfo Value;
2597 public readonly ConstructorInfo Constructor;
2599 public NullableInfo (Type type)
2602 UnderlyingType = TypeManager.GetTypeArguments (type) [0];
2604 PropertyInfo has_value_pi = TypeManager.GetProperty (type, "HasValue");
2605 PropertyInfo value_pi = TypeManager.GetProperty (type, "Value");
2607 HasValue = has_value_pi.GetGetMethod (false);
2608 Value = value_pi.GetGetMethod (false);
2609 Constructor = type.GetConstructor (new Type[] { UnderlyingType });
2613 protected class Unwrap : Expression, IMemoryLocation, IAssignMethod
2618 LocalTemporary temp;
2621 public Unwrap (Expression expr, Location loc)
2627 public override Expression DoResolve (EmitContext ec)
2629 expr = expr.Resolve (ec);
2633 if (!(expr is IMemoryLocation))
2634 temp = new LocalTemporary (ec, expr.Type);
2636 info = new NullableInfo (expr.Type);
2637 type = info.UnderlyingType;
2638 eclass = expr.eclass;
2642 public override void Emit (EmitContext ec)
2644 AddressOf (ec, AddressOp.LoadStore);
2645 ec.ig.EmitCall (OpCodes.Call, info.Value, null);
2648 public void EmitCheck (EmitContext ec)
2650 AddressOf (ec, AddressOp.LoadStore);
2651 ec.ig.EmitCall (OpCodes.Call, info.HasValue, null);
2654 void create_temp (EmitContext ec)
2656 if ((temp != null) && !has_temp) {
2663 public void AddressOf (EmitContext ec, AddressOp mode)
2667 temp.AddressOf (ec, AddressOp.LoadStore);
2669 ((IMemoryLocation) expr).AddressOf (ec, AddressOp.LoadStore);
2672 public void Emit (EmitContext ec, bool leave_copy)
2685 public void EmitAssign (EmitContext ec, Expression source,
2686 bool leave_copy, bool prepare_for_load)
2689 ec.ig.Emit (OpCodes.Newobj, info.Constructor);
2692 ec.ig.Emit (OpCodes.Dup);
2694 Expression empty = new EmptyExpression (expr.Type);
2695 ((IAssignMethod) expr).EmitAssign (ec, empty, false, prepare_for_load);
2699 protected class Wrap : Expression
2704 public Wrap (Expression expr, Location loc)
2710 public override Expression DoResolve (EmitContext ec)
2712 expr = expr.Resolve (ec);
2716 TypeExpr target_type = new NullableType (expr.Type, loc);
2717 target_type = target_type.ResolveAsTypeTerminal (ec);
2718 if (target_type == null)
2721 type = target_type.Type;
2722 info = new NullableInfo (type);
2723 eclass = ExprClass.Value;
2727 public override void Emit (EmitContext ec)
2730 ec.ig.Emit (OpCodes.Newobj, info.Constructor);
2734 public class NullableLiteral : Expression, IMemoryLocation {
2735 public NullableLiteral (Type target_type, Location loc)
2737 this.type = target_type;
2740 eclass = ExprClass.Value;
2743 public override Expression DoResolve (EmitContext ec)
2748 public override void Emit (EmitContext ec)
2750 LocalTemporary value_target = new LocalTemporary (ec, type);
2752 value_target.AddressOf (ec, AddressOp.Store);
2753 ec.ig.Emit (OpCodes.Initobj, type);
2754 value_target.Emit (ec);
2757 public void AddressOf (EmitContext ec, AddressOp Mode)
2759 LocalTemporary value_target = new LocalTemporary (ec, type);
2761 value_target.AddressOf (ec, AddressOp.Store);
2762 ec.ig.Emit (OpCodes.Initobj, type);
2763 ((IMemoryLocation) value_target).AddressOf (ec, Mode);
2767 public abstract class Lifted : Expression, IMemoryLocation
2769 Expression expr, underlying, wrap, null_value;
2772 protected Lifted (Expression expr, Location loc)
2778 public override Expression DoResolve (EmitContext ec)
2780 expr = expr.Resolve (ec);
2784 unwrap = (Unwrap) new Unwrap (expr, loc).Resolve (ec);
2788 underlying = ResolveUnderlying (unwrap, ec);
2789 if (underlying == null)
2792 wrap = new Wrap (underlying, loc).Resolve (ec);
2796 null_value = new NullableLiteral (wrap.Type, loc).Resolve (ec);
2797 if (null_value == null)
2801 eclass = ExprClass.Value;
2805 protected abstract Expression ResolveUnderlying (Expression unwrap, EmitContext ec);
2807 public override void Emit (EmitContext ec)
2809 ILGenerator ig = ec.ig;
2810 Label is_null_label = ig.DefineLabel ();
2811 Label end_label = ig.DefineLabel ();
2813 unwrap.EmitCheck (ec);
2814 ig.Emit (OpCodes.Brfalse, is_null_label);
2817 ig.Emit (OpCodes.Br, end_label);
2819 ig.MarkLabel (is_null_label);
2820 null_value.Emit (ec);
2822 ig.MarkLabel (end_label);
2825 public void AddressOf (EmitContext ec, AddressOp mode)
2827 unwrap.AddressOf (ec, mode);
2831 public class LiftedConversion : Lifted
2833 public readonly bool IsUser;
2834 public readonly bool IsExplicit;
2835 public readonly Type TargetType;
2837 public LiftedConversion (Expression expr, Type target_type, bool is_user,
2838 bool is_explicit, Location loc)
2841 this.IsUser = is_user;
2842 this.IsExplicit = is_explicit;
2843 this.TargetType = target_type;
2846 protected override Expression ResolveUnderlying (Expression unwrap, EmitContext ec)
2848 Type type = TypeManager.GetTypeArguments (TargetType) [0];
2851 return Convert.UserDefinedConversion (ec, unwrap, type, loc, IsExplicit);
2854 return Convert.ExplicitConversion (ec, unwrap, type, loc);
2856 return Convert.ImplicitConversion (ec, unwrap, type, loc);
2861 public class LiftedUnaryOperator : Lifted
2863 public readonly Unary.Operator Oper;
2865 public LiftedUnaryOperator (Unary.Operator op, Expression expr, Location loc)
2871 protected override Expression ResolveUnderlying (Expression unwrap, EmitContext ec)
2873 return new Unary (Oper, unwrap, loc);
2877 public class LiftedConditional : Lifted
2879 Expression true_expr, false_expr;
2881 public LiftedConditional (Expression expr, Expression true_expr, Expression false_expr,
2885 this.true_expr = true_expr;
2886 this.false_expr = false_expr;
2889 protected override Expression ResolveUnderlying (Expression unwrap, EmitContext ec)
2891 return new Conditional (unwrap, true_expr, false_expr);
2895 public class LiftedBinaryOperator : Expression
2897 public readonly Binary.Operator Oper;
2899 Expression left, right, underlying, null_value, bool_wrap;
2900 Unwrap left_unwrap, right_unwrap;
2901 bool is_equality, is_comparision, is_boolean;
2903 public LiftedBinaryOperator (Binary.Operator op, Expression left, Expression right,
2912 public override Expression DoResolve (EmitContext ec)
2914 if (TypeManager.IsNullableType (left.Type)) {
2915 left_unwrap = new Unwrap (left, loc);
2916 left = left_unwrap.Resolve (ec);
2921 if (TypeManager.IsNullableType (right.Type)) {
2922 right_unwrap = new Unwrap (right, loc);
2923 right = right_unwrap.Resolve (ec);
2928 if (((Oper == Binary.Operator.BitwiseAnd) || (Oper == Binary.Operator.BitwiseOr) ||
2929 (Oper == Binary.Operator.LogicalAnd) || (Oper == Binary.Operator.LogicalOr)) &&
2930 ((left.Type == TypeManager.bool_type) && (right.Type == TypeManager.bool_type))) {
2931 Expression empty = new EmptyExpression (TypeManager.bool_type);
2932 bool_wrap = new Wrap (empty, loc).Resolve (ec);
2933 null_value = new NullableLiteral (bool_wrap.Type, loc).Resolve (ec);
2935 type = bool_wrap.Type;
2937 } else if ((Oper == Binary.Operator.Equality) || (Oper == Binary.Operator.Inequality)) {
2938 if (!(left is NullLiteral) && !(right is NullLiteral)) {
2939 underlying = new Binary (Oper, left, right).Resolve (ec);
2940 if (underlying == null)
2944 type = TypeManager.bool_type;
2946 } else if ((Oper == Binary.Operator.LessThan) ||
2947 (Oper == Binary.Operator.GreaterThan) ||
2948 (Oper == Binary.Operator.LessThanOrEqual) ||
2949 (Oper == Binary.Operator.GreaterThanOrEqual)) {
2950 underlying = new Binary (Oper, left, right).Resolve (ec);
2951 if (underlying == null)
2954 type = TypeManager.bool_type;
2955 is_comparision = true;
2957 underlying = new Binary (Oper, left, right).Resolve (ec);
2958 if (underlying == null)
2961 underlying = new Wrap (underlying, loc).Resolve (ec);
2962 if (underlying == null)
2965 type = underlying.Type;
2966 null_value = new NullableLiteral (type, loc).Resolve (ec);
2969 eclass = ExprClass.Value;
2973 void EmitBoolean (EmitContext ec)
2975 ILGenerator ig = ec.ig;
2977 Label left_is_null_label = ig.DefineLabel ();
2978 Label right_is_null_label = ig.DefineLabel ();
2979 Label is_null_label = ig.DefineLabel ();
2980 Label wrap_label = ig.DefineLabel ();
2981 Label end_label = ig.DefineLabel ();
2983 if (left_unwrap != null) {
2984 left_unwrap.EmitCheck (ec);
2985 ig.Emit (OpCodes.Brfalse, left_is_null_label);
2989 ig.Emit (OpCodes.Dup);
2990 if ((Oper == Binary.Operator.BitwiseOr) || (Oper == Binary.Operator.LogicalOr))
2991 ig.Emit (OpCodes.Brtrue, wrap_label);
2993 ig.Emit (OpCodes.Brfalse, wrap_label);
2995 if (right_unwrap != null) {
2996 right_unwrap.EmitCheck (ec);
2997 ig.Emit (OpCodes.Brfalse, right_is_null_label);
3000 if ((Oper == Binary.Operator.LogicalAnd) || (Oper == Binary.Operator.LogicalOr))
3001 ig.Emit (OpCodes.Pop);
3004 if (Oper == Binary.Operator.BitwiseOr)
3005 ig.Emit (OpCodes.Or);
3006 else if (Oper == Binary.Operator.BitwiseAnd)
3007 ig.Emit (OpCodes.And);
3008 ig.Emit (OpCodes.Br, wrap_label);
3010 ig.MarkLabel (left_is_null_label);
3011 if (right_unwrap != null) {
3012 right_unwrap.EmitCheck (ec);
3013 ig.Emit (OpCodes.Brfalse, is_null_label);
3017 ig.Emit (OpCodes.Dup);
3018 if ((Oper == Binary.Operator.BitwiseOr) || (Oper == Binary.Operator.LogicalOr))
3019 ig.Emit (OpCodes.Brtrue, wrap_label);
3021 ig.Emit (OpCodes.Brfalse, wrap_label);
3023 ig.MarkLabel (right_is_null_label);
3024 ig.Emit (OpCodes.Pop);
3025 ig.MarkLabel (is_null_label);
3026 null_value.Emit (ec);
3027 ig.Emit (OpCodes.Br, end_label);
3029 ig.MarkLabel (wrap_label);
3030 ig.Emit (OpCodes.Nop);
3031 bool_wrap.Emit (ec);
3032 ig.Emit (OpCodes.Nop);
3034 ig.MarkLabel (end_label);
3037 void EmitEquality (EmitContext ec)
3039 ILGenerator ig = ec.ig;
3041 Label left_not_null_label = ig.DefineLabel ();
3042 Label false_label = ig.DefineLabel ();
3043 Label true_label = ig.DefineLabel ();
3044 Label end_label = ig.DefineLabel ();
3046 bool false_label_used = false;
3047 bool true_label_used = false;
3049 if (left_unwrap != null) {
3050 left_unwrap.EmitCheck (ec);
3051 if (right is NullLiteral) {
3052 if (Oper == Binary.Operator.Equality) {
3053 true_label_used = true;
3054 ig.Emit (OpCodes.Brfalse, true_label);
3056 false_label_used = true;
3057 ig.Emit (OpCodes.Brfalse, false_label);
3059 } else if (right_unwrap != null) {
3060 ig.Emit (OpCodes.Dup);
3061 ig.Emit (OpCodes.Brtrue, left_not_null_label);
3062 right_unwrap.EmitCheck (ec);
3063 ig.Emit (OpCodes.Ceq);
3064 if (Oper == Binary.Operator.Inequality) {
3065 ig.Emit (OpCodes.Ldc_I4_0);
3066 ig.Emit (OpCodes.Ceq);
3068 ig.Emit (OpCodes.Br, end_label);
3070 ig.MarkLabel (left_not_null_label);
3071 ig.Emit (OpCodes.Pop);
3073 if (Oper == Binary.Operator.Equality) {
3074 false_label_used = true;
3075 ig.Emit (OpCodes.Brfalse, false_label);
3077 true_label_used = true;
3078 ig.Emit (OpCodes.Brfalse, true_label);
3083 if (right_unwrap != null) {
3084 right_unwrap.EmitCheck (ec);
3085 if (left is NullLiteral) {
3086 if (Oper == Binary.Operator.Equality) {
3087 true_label_used = true;
3088 ig.Emit (OpCodes.Brfalse, true_label);
3090 false_label_used = true;
3091 ig.Emit (OpCodes.Brfalse, false_label);
3094 if (Oper == Binary.Operator.Equality) {
3095 false_label_used = true;
3096 ig.Emit (OpCodes.Brfalse, false_label);
3098 true_label_used = true;
3099 ig.Emit (OpCodes.Brfalse, true_label);
3104 bool left_is_null = left is NullLiteral;
3105 bool right_is_null = right is NullLiteral;
3106 if (left_is_null || right_is_null) {
3107 if (((Oper == Binary.Operator.Equality) && (left_is_null == right_is_null)) ||
3108 ((Oper == Binary.Operator.Inequality) && (left_is_null != right_is_null))) {
3109 true_label_used = true;
3110 ig.Emit (OpCodes.Br, true_label);
3112 false_label_used = true;
3113 ig.Emit (OpCodes.Br, false_label);
3116 underlying.Emit (ec);
3117 ig.Emit (OpCodes.Br, end_label);
3120 ig.MarkLabel (false_label);
3121 if (false_label_used) {
3122 ig.Emit (OpCodes.Ldc_I4_0);
3123 if (true_label_used)
3124 ig.Emit (OpCodes.Br, end_label);
3127 ig.MarkLabel (true_label);
3128 if (true_label_used)
3129 ig.Emit (OpCodes.Ldc_I4_1);
3131 ig.MarkLabel (end_label);
3134 void EmitComparision (EmitContext ec)
3136 ILGenerator ig = ec.ig;
3138 Label is_null_label = ig.DefineLabel ();
3139 Label end_label = ig.DefineLabel ();
3141 if (left_unwrap != null) {
3142 left_unwrap.EmitCheck (ec);
3143 ig.Emit (OpCodes.Brfalse, is_null_label);
3146 if (right_unwrap != null) {
3147 right_unwrap.EmitCheck (ec);
3148 ig.Emit (OpCodes.Brfalse, is_null_label);
3151 underlying.Emit (ec);
3152 ig.Emit (OpCodes.Br, end_label);
3154 ig.MarkLabel (is_null_label);
3155 ig.Emit (OpCodes.Ldc_I4_0);
3157 ig.MarkLabel (end_label);
3160 public override void Emit (EmitContext ec)
3165 } else if (is_equality) {
3168 } else if (is_comparision) {
3169 EmitComparision (ec);
3173 ILGenerator ig = ec.ig;
3175 Label is_null_label = ig.DefineLabel ();
3176 Label end_label = ig.DefineLabel ();
3178 if (left_unwrap != null) {
3179 left_unwrap.EmitCheck (ec);
3180 ig.Emit (OpCodes.Brfalse, is_null_label);
3183 if (right_unwrap != null) {
3184 right_unwrap.EmitCheck (ec);
3185 ig.Emit (OpCodes.Brfalse, is_null_label);
3188 underlying.Emit (ec);
3189 ig.Emit (OpCodes.Br, end_label);
3191 ig.MarkLabel (is_null_label);
3192 null_value.Emit (ec);
3194 ig.MarkLabel (end_label);
3198 public class OperatorTrueOrFalse : Expression
3200 public readonly bool IsTrue;
3205 public OperatorTrueOrFalse (Expression expr, bool is_true, Location loc)
3207 this.IsTrue = is_true;
3212 public override Expression DoResolve (EmitContext ec)
3214 unwrap = new Unwrap (expr, loc);
3215 expr = unwrap.Resolve (ec);
3219 if (unwrap.Type != TypeManager.bool_type)
3222 type = TypeManager.bool_type;
3223 eclass = ExprClass.Value;
3227 public override void Emit (EmitContext ec)
3229 ILGenerator ig = ec.ig;
3231 Label is_null_label = ig.DefineLabel ();
3232 Label end_label = ig.DefineLabel ();
3234 unwrap.EmitCheck (ec);
3235 ig.Emit (OpCodes.Brfalse, is_null_label);
3239 ig.Emit (OpCodes.Ldc_I4_0);
3240 ig.Emit (OpCodes.Ceq);
3242 ig.Emit (OpCodes.Br, end_label);
3244 ig.MarkLabel (is_null_label);
3245 ig.Emit (OpCodes.Ldc_I4_0);
3247 ig.MarkLabel (end_label);
3251 public class NullCoalescingOperator : Expression
3253 Expression left, right;
3257 public NullCoalescingOperator (Expression left, Expression right, Location loc)
3263 eclass = ExprClass.Value;
3266 public override Expression DoResolve (EmitContext ec)
3271 left = left.Resolve (ec);
3275 right = right.Resolve (ec);
3279 Type ltype = left.Type, rtype = right.Type;
3281 if (!TypeManager.IsNullableType (ltype) && ltype.IsValueType) {
3282 Binary.Error_OperatorCannotBeApplied (loc, "??", ltype, rtype);
3286 if (TypeManager.IsNullableType (ltype)) {
3287 NullableInfo info = new NullableInfo (ltype);
3289 unwrap = (Unwrap) new Unwrap (left, loc).Resolve (ec);
3293 expr = Convert.ImplicitConversion (ec, right, info.UnderlyingType, loc);
3301 expr = Convert.ImplicitConversion (ec, right, ltype, loc);
3307 if (unwrap != null) {
3308 expr = Convert.ImplicitConversion (ec, unwrap, rtype, loc);
3317 Binary.Error_OperatorCannotBeApplied (loc, "??", ltype, rtype);
3321 public override void Emit (EmitContext ec)
3323 ILGenerator ig = ec.ig;
3325 Label is_null_label = ig.DefineLabel ();
3326 Label end_label = ig.DefineLabel ();
3328 if (unwrap != null) {
3329 unwrap.EmitCheck (ec);
3330 ig.Emit (OpCodes.Brfalse, is_null_label);
3333 ig.Emit (OpCodes.Br, end_label);
3335 ig.MarkLabel (is_null_label);
3338 ig.MarkLabel (end_label);
3341 ig.Emit (OpCodes.Dup);
3342 ig.Emit (OpCodes.Brtrue, end_label);
3344 ig.MarkLabel (is_null_label);
3346 ig.Emit (OpCodes.Pop);
3349 ig.MarkLabel (end_label);
3354 public class LiftedUnaryMutator : ExpressionStatement
3356 public readonly UnaryMutator.Mode Mode;
3357 Expression expr, null_value;
3358 UnaryMutator underlying;
3361 public LiftedUnaryMutator (UnaryMutator.Mode mode, Expression expr, Location loc)
3367 eclass = ExprClass.Value;
3370 public override Expression DoResolve (EmitContext ec)
3372 expr = expr.Resolve (ec);
3376 unwrap = (Unwrap) new Unwrap (expr, loc).Resolve (ec);
3380 underlying = (UnaryMutator) new UnaryMutator (Mode, unwrap, loc).Resolve (ec);
3381 if (underlying == null)
3384 null_value = new NullableLiteral (expr.Type, loc).Resolve (ec);
3385 if (null_value == null)
3392 void DoEmit (EmitContext ec, bool is_expr)
3394 ILGenerator ig = ec.ig;
3395 Label is_null_label = ig.DefineLabel ();
3396 Label end_label = ig.DefineLabel ();
3398 unwrap.EmitCheck (ec);
3399 ig.Emit (OpCodes.Brfalse, is_null_label);
3402 underlying.Emit (ec);
3404 underlying.EmitStatement (ec);
3405 ig.Emit (OpCodes.Br, end_label);
3407 ig.MarkLabel (is_null_label);
3409 null_value.Emit (ec);
3411 ig.MarkLabel (end_label);
3414 public override void Emit (EmitContext ec)
3419 public override void EmitStatement (EmitContext ec)