2 // delegate.cs: Delegate Handler
5 // Ravi Pratap (ravi@ximian.com)
6 // Miguel de Icaza (miguel@ximian.com)
8 // Licensed under the terms of the GNU GPL
10 // (C) 2001 Ximian, Inc (http://www.ximian.com)
15 using System.Collections;
16 using System.Reflection;
17 using System.Reflection.Emit;
20 namespace Mono.CSharp {
25 public class Delegate : DeclSpace {
26 public Expression ReturnType;
27 public Parameters Parameters;
29 public ConstructorBuilder ConstructorBuilder;
30 public MethodBuilder InvokeBuilder;
31 public MethodBuilder BeginInvokeBuilder;
32 public MethodBuilder EndInvokeBuilder;
37 static string[] attribute_targets = new string [] { "type", "return" };
39 Expression instance_expr;
40 MethodBase delegate_method;
41 ReturnParameter return_attributes;
43 const int AllowedModifiers =
51 public Delegate (NamespaceEntry ns, TypeContainer parent, Expression type,
52 int mod_flags, MemberName name, Parameters param_list,
53 Attributes attrs, Location l)
54 : base (ns, parent, name, attrs, l)
57 this.ReturnType = type;
58 ModFlags = Modifiers.Check (AllowedModifiers, mod_flags,
59 IsTopLevel ? Modifiers.INTERNAL :
60 Modifiers.PRIVATE, l);
61 Parameters = param_list;
64 public override void ApplyAttributeBuilder(Attribute a, CustomAttributeBuilder cb)
66 if (a.Target == AttributeTargets.ReturnValue) {
67 if (return_attributes == null)
68 return_attributes = new ReturnParameter (InvokeBuilder, Location);
70 return_attributes.ApplyAttributeBuilder (a, cb);
74 base.ApplyAttributeBuilder (a, cb);
77 public override TypeBuilder DefineType ()
79 if (TypeBuilder != null)
82 ec = new EmitContext (this, this, Location, null, null, ModFlags, false);
85 foreach (TypeParameter type_param in TypeParameters)
86 if (!type_param.Resolve (this))
90 TypeAttributes attr = Modifiers.TypeAttr (ModFlags, IsTopLevel) |
91 TypeAttributes.Class | TypeAttributes.Sealed;
93 if (TypeManager.multicast_delegate_type == null && !RootContext.StdLib) {
94 TypeExpr expr = new TypeLookupExpression ("System.MulticastDelegate");
95 TypeManager.multicast_delegate_type = expr.ResolveType (ec);
98 if (TypeManager.multicast_delegate_type == null)
99 Report.Error (-100, Location, "Internal error: delegate used before " +
100 "System.MulticastDelegate is resolved. This can only " +
101 "happen during corlib compilation, when using a delegate " +
102 "in any of the `core' classes. See bug #72015 for details.");
105 if (TypeManager.NamespaceClash (Name, Location))
108 ModuleBuilder builder = CodeGen.Module.Builder;
110 TypeBuilder = builder.DefineType (
111 Name, attr, TypeManager.multicast_delegate_type);
113 TypeBuilder builder = Parent.TypeBuilder;
115 string name = Name.Substring (1 + Name.LastIndexOf ('.'));
116 TypeBuilder = builder.DefineNestedType (
117 name, attr, TypeManager.multicast_delegate_type);
120 TypeManager.AddDelegateType (Name, TypeBuilder, this);
123 string[] param_names = new string [TypeParameters.Length];
124 for (int i = 0; i < TypeParameters.Length; i++)
125 param_names [i] = TypeParameters [i].Name;
127 GenericTypeParameterBuilder[] gen_params;
128 gen_params = TypeBuilder.DefineGenericParameters (param_names);
130 int offset = CountTypeParameters - CurrentTypeParameters.Length;
131 for (int i = offset; i < gen_params.Length; i++)
132 CurrentTypeParameters [i - offset].Define (gen_params [i]);
134 foreach (TypeParameter type_param in CurrentTypeParameters) {
135 if (!type_param.Resolve (this))
139 for (int i = offset; i < gen_params.Length; i++)
140 CurrentTypeParameters [i - offset].DefineConstraints ();
142 TypeExpr current = new ConstructedType (Name, TypeParameters, Location);
143 current = current.ResolveAsTypeTerminal (ec);
147 CurrentType = current.Type;
153 public override bool DefineMembers (TypeContainer container)
158 public override bool Define ()
160 MethodAttributes mattr;
164 foreach (TypeParameter type_param in TypeParameters)
165 type_param.DefineType (ec);
169 throw new InternalErrorException ("Define called before DefineType?");
171 // FIXME: POSSIBLY make this static, as it is always constant
173 Type [] const_arg_types = new Type [2];
174 const_arg_types [0] = TypeManager.object_type;
175 const_arg_types [1] = TypeManager.intptr_type;
177 mattr = MethodAttributes.RTSpecialName | MethodAttributes.SpecialName |
178 MethodAttributes.HideBySig | MethodAttributes.Public;
180 ConstructorBuilder = TypeBuilder.DefineConstructor (mattr,
181 CallingConventions.Standard,
184 ConstructorBuilder.DefineParameter (1, ParameterAttributes.None, "object");
185 ConstructorBuilder.DefineParameter (2, ParameterAttributes.None, "method");
187 // HACK because System.Reflection.Emit is lame
190 // FIXME: POSSIBLY make these static, as they are always the same
191 Parameter [] fixed_pars = new Parameter [2];
192 fixed_pars [0] = new Parameter (TypeManager.system_object_expr, "object",
193 Parameter.Modifier.NONE, null);
194 fixed_pars [1] = new Parameter (TypeManager.system_intptr_expr, "method",
195 Parameter.Modifier.NONE, null);
196 Parameters const_parameters = new Parameters (fixed_pars, null, Location);
198 TypeManager.RegisterMethod (
200 new InternalParameters (const_arg_types, const_parameters),
204 ConstructorBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
207 // Here the various methods like Invoke, BeginInvoke etc are defined
209 // First, call the `out of band' special method for
210 // defining recursively any types we need:
212 if (!Parameters.ComputeAndDefineParameterTypes (ec))
215 param_types = Parameters.GetParameterInfo (ec);
216 if (param_types == null)
223 // Check accessibility
224 foreach (Type partype in param_types){
225 if (!Parent.AsAccessible (partype, ModFlags)) {
226 Report.Error (59, Location,
227 "Inconsistent accessibility: parameter type `" +
228 TypeManager.CSharpName (partype) + "` is less " +
229 "accessible than delegate `" + Name + "'");
232 if (partype.IsPointer && !UnsafeOK (Parent))
236 ReturnType = ReturnType.ResolveAsTypeTerminal (ec);
237 if (ReturnType == null)
240 ret_type = ReturnType.Type;
241 if (ret_type == null)
244 if (!Parent.AsAccessible (ret_type, ModFlags)) {
245 Report.Error (58, Location,
246 "Inconsistent accessibility: return type `" +
247 TypeManager.CSharpName (ret_type) + "` is less " +
248 "accessible than delegate `" + Name + "'");
252 if (ret_type.IsPointer && !UnsafeOK (Parent))
255 if (RootContext.StdLib && (ret_type == TypeManager.arg_iterator_type || ret_type == TypeManager.typed_reference_type)) {
256 Method.Error1599 (Location, ret_type);
261 // We don't have to check any others because they are all
262 // guaranteed to be accessible - they are standard types.
265 CallingConventions cc = Parameters.GetCallingConvention ();
267 mattr = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Virtual;
269 InvokeBuilder = TypeBuilder.DefineMethod ("Invoke",
276 // Define parameters, and count out/ref parameters
280 if (Parameters.FixedParameters != null){
281 int top = Parameters.FixedParameters.Length;
284 for (; i < top; i++) {
285 p = Parameters.FixedParameters [i];
286 p.DefineParameter (ec, InvokeBuilder, null, i + 1, Location);
288 if ((p.ModFlags & Parameter.Modifier.ISBYREF) != 0)
292 if (Parameters.ArrayParameter != null){
293 Parameter p = Parameters.ArrayParameter;
294 p.DefineParameter (ec, InvokeBuilder, null, i + 1, Location);
297 InvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
299 TypeManager.RegisterMethod (InvokeBuilder,
300 new InternalParameters (param_types, Parameters),
306 int params_num = param_types.Length;
307 Type [] async_param_types = new Type [params_num + 2];
309 param_types.CopyTo (async_param_types, 0);
311 async_param_types [params_num] = TypeManager.asynccallback_type;
312 async_param_types [params_num + 1] = TypeManager.object_type;
314 mattr = MethodAttributes.Public | MethodAttributes.HideBySig |
315 MethodAttributes.Virtual | MethodAttributes.NewSlot;
317 BeginInvokeBuilder = TypeBuilder.DefineMethod ("BeginInvoke",
320 TypeManager.iasyncresult_type,
324 if (Parameters.FixedParameters != null){
325 int top = Parameters.FixedParameters.Length;
328 for (i = 0 ; i < top; i++) {
329 p = Parameters.FixedParameters [i];
331 p.DefineParameter (ec, BeginInvokeBuilder, null, i + 1, Location);
334 if (Parameters.ArrayParameter != null){
335 Parameter p = Parameters.ArrayParameter;
336 p.DefineParameter (ec, BeginInvokeBuilder, null, i + 1, Location);
341 BeginInvokeBuilder.DefineParameter (i + 1, ParameterAttributes.None, "callback");
342 BeginInvokeBuilder.DefineParameter (i + 2, ParameterAttributes.None, "object");
344 BeginInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
346 Parameter [] async_params = new Parameter [params_num + 2];
348 if (Parameters.FixedParameters != null){
349 Parameters.FixedParameters.CopyTo (async_params, 0);
350 n = Parameters.FixedParameters.Length;
352 if (Parameters.ArrayParameter != null)
353 async_params [n] = Parameters.ArrayParameter;
355 async_params [params_num] = new Parameter (
356 TypeManager.system_asynccallback_expr, "callback",
357 Parameter.Modifier.NONE, null);
358 async_params [params_num + 1] = new Parameter (
359 TypeManager.system_object_expr, "object",
360 Parameter.Modifier.NONE, null);
362 Parameters async_parameters = new Parameters (async_params, null, Location);
363 async_parameters.ComputeAndDefineParameterTypes (ec);
365 TypeManager.RegisterMethod (BeginInvokeBuilder,
366 new InternalParameters (async_param_types, async_parameters),
370 // EndInvoke is a bit more interesting, all the parameters labeled as
371 // out or ref have to be duplicated here.
374 Type [] end_param_types = new Type [out_params + 1];
375 Parameter [] end_params = new Parameter [out_params + 1];
378 int top = Parameters.FixedParameters.Length;
379 for (i = 0; i < top; i++){
380 Parameter p = Parameters.FixedParameters [i];
381 if ((p.ModFlags & Parameter.Modifier.ISBYREF) == 0)
384 end_param_types [param] = param_types [i];
385 end_params [param] = p;
389 end_param_types [out_params] = TypeManager.iasyncresult_type;
390 end_params [out_params] = new Parameter (TypeManager.system_iasyncresult_expr, "result", Parameter.Modifier.NONE, null);
393 // Create method, define parameters, register parameters with type system
395 EndInvokeBuilder = TypeBuilder.DefineMethod ("EndInvoke", mattr, cc, ret_type, end_param_types);
396 EndInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
399 // EndInvoke: Label the parameters
401 EndInvokeBuilder.DefineParameter (out_params + 1, ParameterAttributes.None, "result");
402 for (i = 0; i < end_params.Length-1; i++){
403 EndInvokeBuilder.DefineParameter (i + 1, end_params [i].Attributes, end_params [i].Name);
406 Parameters end_parameters = new Parameters (end_params, null, Location);
407 end_parameters.ComputeAndDefineParameterTypes (ec);
409 TypeManager.RegisterMethod (
411 new InternalParameters (end_param_types, end_parameters),
417 public override void Emit ()
419 if (OptAttributes != null) {
420 Parameters.LabelParameters (ec, InvokeBuilder, Location);
421 OptAttributes.Emit (ec, this);
427 public override string[] ValidAttributeTargets {
429 return attribute_targets;
434 protected override bool VerifyClsCompliance (DeclSpace ds)
436 if (!base.VerifyClsCompliance (ds)) {
440 AttributeTester.AreParametersCompliant (Parameters.FixedParameters, Location);
442 if (!AttributeTester.IsClsCompliant (ReturnType.Type)) {
443 Report.Error (3002, Location, "Return type of '{0}' is not CLS-compliant", GetSignatureForError ());
449 // Returns the MethodBase for "Invoke" from a delegate type, this is used
450 // to extract the signature of a delegate.
452 public static MethodGroupExpr GetInvokeMethod (EmitContext ec, Type delegate_type,
455 Expression ml = Expression.MemberLookup (
456 ec, delegate_type, "Invoke", loc);
458 MethodGroupExpr mg = ml as MethodGroupExpr;
460 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
468 /// Verifies whether the method in question is compatible with the delegate
469 /// Returns the method itself if okay and null if not.
471 public static MethodBase VerifyMethod (EmitContext ec, Type delegate_type, MethodBase mb,
474 MethodGroupExpr mg = GetInvokeMethod (ec, delegate_type, loc);
478 MethodBase invoke_mb = mg.Methods [0];
479 ParameterData invoke_pd = TypeManager.GetParameterData (invoke_mb);
481 if (!mg.HasTypeArguments &&
482 !TypeManager.InferTypeArguments (ec, invoke_pd, ref mb))
485 ParameterData pd = TypeManager.GetParameterData (mb);
486 if (invoke_pd.Count != pd.Count)
489 for (int i = pd.Count; i > 0; ) {
492 Type invoke_pd_type = invoke_pd.ParameterType (i);
493 Type pd_type = pd.ParameterType (i);
494 Parameter.Modifier invoke_pd_type_mod = invoke_pd.ParameterModifier (i);
495 Parameter.Modifier pd_type_mod = pd.ParameterModifier (i);
497 if (invoke_pd_type == pd_type &&
498 invoke_pd_type_mod == pd_type_mod)
501 if (invoke_pd_type.IsSubclassOf (pd_type) &&
502 invoke_pd_type_mod == pd_type_mod)
503 if (RootContext.Version == LanguageVersion.ISO_1) {
504 Report.FeatureIsNotStandardized (loc, "contravariance");
512 Type invoke_mb_retval = ((MethodInfo) invoke_mb).ReturnType;
513 Type mb_retval = ((MethodInfo) mb).ReturnType;
514 if (invoke_mb_retval == mb_retval)
517 if (mb_retval.IsSubclassOf (invoke_mb_retval))
518 if (RootContext.Version == LanguageVersion.ISO_1) {
519 Report.FeatureIsNotStandardized (loc, "covariance");
529 // Verifies whether the invocation arguments are compatible with the
530 // delegate's target method
532 public static bool VerifyApplicability (EmitContext ec, Type delegate_type,
533 ArrayList args, Location loc)
540 arg_count = args.Count;
542 Expression ml = Expression.MemberLookup (
543 ec, delegate_type, "Invoke", loc);
545 MethodGroupExpr me = ml as MethodGroupExpr;
547 Report.Error (-100, loc, "Internal error: could not find Invoke method!" + delegate_type);
551 MethodBase mb = me.Methods [0];
552 ParameterData pd = TypeManager.GetParameterData (mb);
554 int pd_count = pd.Count;
556 bool params_method = (pd_count != 0) &&
557 (pd.ParameterModifier (pd_count - 1) == Parameter.Modifier.PARAMS);
559 bool is_params_applicable = false;
560 bool is_applicable = Invocation.IsApplicable (ec, me, args, arg_count, ref mb);
562 if (!is_applicable && params_method &&
563 Invocation.IsParamsMethodApplicable (ec, me, args, arg_count, ref mb))
564 is_applicable = is_params_applicable = true;
566 if (!is_applicable && !params_method && arg_count != pd_count) {
567 Report.Error (1593, loc,
568 "Delegate '{0}' does not take {1} arguments",
569 delegate_type.ToString (), arg_count);
573 return Invocation.VerifyArgumentsCompat (
574 ec, args, arg_count, mb,
575 is_params_applicable || (!is_applicable && params_method),
576 delegate_type, false, loc);
580 /// Verifies whether the delegate in question is compatible with this one in
581 /// order to determine if instantiation from the same is possible.
583 public static bool VerifyDelegate (EmitContext ec, Type delegate_type, Type probe_type, Location loc)
585 Expression ml = Expression.MemberLookup (
586 ec, delegate_type, "Invoke", loc);
588 if (!(ml is MethodGroupExpr)) {
589 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
593 MethodBase mb = ((MethodGroupExpr) ml).Methods [0];
594 ParameterData pd = TypeManager.GetParameterData (mb);
596 Expression probe_ml = Expression.MemberLookup (
597 ec, delegate_type, "Invoke", loc);
599 if (!(probe_ml is MethodGroupExpr)) {
600 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
604 MethodBase probe_mb = ((MethodGroupExpr) probe_ml).Methods [0];
605 ParameterData probe_pd = TypeManager.GetParameterData (probe_mb);
607 if (((MethodInfo) mb).ReturnType != ((MethodInfo) probe_mb).ReturnType)
610 if (pd.Count != probe_pd.Count)
613 for (int i = pd.Count; i > 0; ) {
616 if (pd.ParameterType (i) != probe_pd.ParameterType (i) ||
617 pd.ParameterModifier (i) != probe_pd.ParameterModifier (i))
624 public static string FullDelegateDesc (Type del_type, MethodBase mb, ParameterData pd)
626 StringBuilder sb = new StringBuilder (TypeManager.CSharpName (((MethodInfo) mb).ReturnType));
628 sb.Append (" " + del_type.ToString ());
631 int length = pd.Count;
633 for (int i = length; i > 0; ) {
636 sb.Append (pd.ParameterDesc (length - i - 1));
642 return sb.ToString ();
646 // Hack around System.Reflection as found everywhere else
647 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
648 MemberFilter filter, object criteria)
650 ArrayList members = new ArrayList ();
652 if ((mt & MemberTypes.Method) != 0) {
653 if (ConstructorBuilder != null)
654 if (filter (ConstructorBuilder, criteria))
655 members.Add (ConstructorBuilder);
657 if (InvokeBuilder != null)
658 if (filter (InvokeBuilder, criteria))
659 members.Add (InvokeBuilder);
661 if (BeginInvokeBuilder != null)
662 if (filter (BeginInvokeBuilder, criteria))
663 members.Add (BeginInvokeBuilder);
665 if (EndInvokeBuilder != null)
666 if (filter (EndInvokeBuilder, criteria))
667 members.Add (EndInvokeBuilder);
670 return new MemberList (members);
673 public override MemberCache MemberCache {
679 public Expression InstanceExpression {
681 return instance_expr;
684 instance_expr = value;
688 public MethodBase TargetMethod {
690 return delegate_method;
693 delegate_method = value;
697 public Type TargetReturnType {
703 public Type [] ParameterTypes {
709 public override AttributeTargets AttributeTargets {
711 return AttributeTargets.Delegate;
716 // Represents header string for documentation comment.
718 public override string DocCommentHeader {
722 protected override void VerifyObsoleteAttribute()
724 CheckUsageOfObsoleteAttribute (ret_type);
726 foreach (Type type in param_types) {
727 CheckUsageOfObsoleteAttribute (type);
733 // Base class for `NewDelegate' and `ImplicitDelegateCreation'
735 public abstract class DelegateCreation : Expression {
736 protected MethodBase constructor_method;
737 protected MethodBase delegate_method;
738 protected MethodGroupExpr method_group;
739 protected Expression delegate_instance_expression;
741 public DelegateCreation () {}
743 public static void Error_NoMatchingMethodForDelegate (EmitContext ec, MethodGroupExpr mg, Type type, Location loc)
747 MethodBase candidate = mg.Methods [0];
748 if (mg.Methods.Length > 1)
749 method_desc = candidate.Name;
751 method_desc = Invocation.FullMethodDesc (candidate);
753 Expression invoke_method = Expression.MemberLookup (
754 ec, type, "Invoke", MemberTypes.Method,
755 Expression.AllBindingFlags, loc);
756 MethodBase method = ((MethodGroupExpr) invoke_method).Methods [0];
757 ParameterData param = TypeManager.GetParameterData (method);
758 string delegate_desc = Delegate.FullDelegateDesc (type, method, param);
760 if (!mg.HasTypeArguments &&
761 !TypeManager.InferTypeArguments (ec, param, ref candidate))
762 Report.Error (411, loc, "The type arguments for " +
763 "method `{0}' cannot be infered from " +
764 "the usage. Try specifying the type " +
765 "arguments explicitly.", method_desc);
767 Report.Error (123, loc, "Method '{0}' does not " +
768 "match delegate '{1}'", method_desc,
772 public override void Emit (EmitContext ec)
774 if (delegate_instance_expression == null || delegate_method.IsStatic)
775 ec.ig.Emit (OpCodes.Ldnull);
777 delegate_instance_expression.Emit (ec);
779 if (delegate_method.IsVirtual && !method_group.IsBase) {
780 ec.ig.Emit (OpCodes.Dup);
781 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);
783 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);
784 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);
787 protected bool ResolveConstructorMethod (EmitContext ec)
789 Expression ml = Expression.MemberLookup (
790 ec, type, ".ctor", loc);
792 if (!(ml is MethodGroupExpr)) {
793 Report.Error (-100, loc, "Internal error: Could not find delegate constructor!");
797 constructor_method = ((MethodGroupExpr) ml).Methods [0];
801 protected Expression ResolveMethodGroupExpr (EmitContext ec, MethodGroupExpr mg)
803 foreach (MethodInfo mi in mg.Methods){
804 delegate_method = Delegate.VerifyMethod (ec, type, mi, loc);
806 if (delegate_method != null)
810 if (delegate_method == null) {
811 Error_NoMatchingMethodForDelegate (ec, mg, type, loc);
816 // Check safe/unsafe of the delegate
819 ParameterData param = TypeManager.GetParameterData (delegate_method);
820 int count = param.Count;
822 for (int i = 0; i < count; i++){
823 if (param.ParameterType (i).IsPointer){
824 Expression.UnsafeError (loc);
830 //TODO: implement caching when performance will be low
831 IMethodData md = TypeManager.GetMethod (delegate_method);
833 if (System.Attribute.GetCustomAttribute (delegate_method, TypeManager.conditional_attribute_type) != null) {
834 Report.Error (1618, loc, "Cannot create delegate with '{0}' because it has a Conditional attribute", TypeManager.CSharpSignature (delegate_method));
837 if (md.OptAttributes != null && md.OptAttributes.Search (TypeManager.conditional_attribute_type, ec) != null) {
838 Report.Error (1618, loc, "Cannot create delegate with '{0}' because it has a Conditional attribute", TypeManager.CSharpSignature (delegate_method));
842 if (mg.InstanceExpression != null)
843 delegate_instance_expression = mg.InstanceExpression.Resolve (ec);
844 else if (ec.IsStatic) {
845 if (!delegate_method.IsStatic) {
846 Report.Error (120, loc,
847 "An object reference is required for the non-static method " +
848 delegate_method.Name);
851 delegate_instance_expression = null;
853 delegate_instance_expression = ec.GetThis (loc);
855 if (delegate_instance_expression != null && delegate_instance_expression.Type.IsValueType)
856 delegate_instance_expression = new BoxedCast (delegate_instance_expression);
859 eclass = ExprClass.Value;
865 // Created from the conversion code
867 public class ImplicitDelegateCreation : DelegateCreation {
869 ImplicitDelegateCreation (Type t, Location l)
875 public override Expression DoResolve (EmitContext ec)
880 static public Expression Create (EmitContext ec, MethodGroupExpr mge, Type target_type, Location loc)
882 ImplicitDelegateCreation d = new ImplicitDelegateCreation (target_type, loc);
883 if (d.ResolveConstructorMethod (ec))
884 return d.ResolveMethodGroupExpr (ec, mge);
891 // A delegate-creation-expression, invoked from the `New' class
893 public class NewDelegate : DelegateCreation {
894 public ArrayList Arguments;
897 // This constructor is invoked from the `New' expression
899 public NewDelegate (Type type, ArrayList Arguments, Location loc)
902 this.Arguments = Arguments;
906 public override Expression DoResolve (EmitContext ec)
908 if (Arguments == null || Arguments.Count != 1) {
909 Report.Error (149, loc,
910 "Method name expected");
914 if (!ResolveConstructorMethod (ec))
917 Argument a = (Argument) Arguments [0];
919 if (!a.ResolveMethodGroup (ec, loc))
922 Expression e = a.Expr;
924 if (e is AnonymousMethod && RootContext.Version != LanguageVersion.ISO_1)
925 return ((AnonymousMethod) e).Compatible (ec, type, false);
927 MethodGroupExpr mg = e as MethodGroupExpr;
929 return ResolveMethodGroupExpr (ec, mg);
931 Type e_type = e.Type;
933 if (!TypeManager.IsDelegateType (e_type)) {
934 Report.Error (149, loc, "Method name expected");
938 method_group = Expression.MemberLookup (
939 ec, type, "Invoke", MemberTypes.Method,
940 Expression.AllBindingFlags, loc) as MethodGroupExpr;
942 if (method_group == null) {
943 Report.Error (-200, loc, "Internal error ! Could not find Invoke method!");
947 // This is what MS' compiler reports. We could always choose
948 // to be more verbose and actually give delegate-level specifics
949 if (!Delegate.VerifyDelegate (ec, type, e_type, loc)) {
950 Report.Error (29, loc, "Cannot implicitly convert type '" + e_type + "' " +
951 "to type '" + type + "'");
955 delegate_instance_expression = e;
956 delegate_method = method_group.Methods [0];
958 eclass = ExprClass.Value;
963 public class DelegateInvocation : ExpressionStatement {
965 public Expression InstanceExpr;
966 public ArrayList Arguments;
970 public DelegateInvocation (Expression instance_expr, ArrayList args, Location loc)
972 this.InstanceExpr = instance_expr;
973 this.Arguments = args;
977 public override Expression DoResolve (EmitContext ec)
979 if (InstanceExpr is EventExpr) {
981 EventInfo ei = ((EventExpr) InstanceExpr).EventInfo;
983 Expression ml = MemberLookup (
984 ec, ec.ContainerType, ei.Name,
985 MemberTypes.Event, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
989 // If this is the case, then the Event does not belong
990 // to this Type and so, according to the spec
991 // cannot be accessed directly
993 // Note that target will not appear as an EventExpr
994 // in the case it is being referenced within the same type container;
995 // it will appear as a FieldExpr in that case.
998 Assign.error70 (ei, loc);
1004 Type del_type = InstanceExpr.Type;
1005 if (del_type == null)
1008 if (Arguments != null){
1009 foreach (Argument a in Arguments){
1010 if (!a.Resolve (ec, loc))
1015 if (!Delegate.VerifyApplicability (ec, del_type, Arguments, loc))
1018 Expression lookup = Expression.MemberLookup (ec, del_type, "Invoke", loc);
1019 if (!(lookup is MethodGroupExpr)) {
1020 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
1024 method = ((MethodGroupExpr) lookup).Methods [0];
1025 type = ((MethodInfo) method).ReturnType;
1026 eclass = ExprClass.Value;
1031 public override void Emit (EmitContext ec)
1034 // Invocation on delegates call the virtual Invoke member
1035 // so we are always `instance' calls
1037 Invocation.EmitCall (ec, false, false, InstanceExpr, method, Arguments, loc);
1040 public override void EmitStatement (EmitContext ec)
1044 // Pop the return value if there is one
1046 if (method is MethodInfo){
1047 if (((MethodInfo) method).ReturnType != TypeManager.void_type)
1048 ec.ig.Emit (OpCodes.Pop);