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))
256 // We don't have to check any others because they are all
257 // guaranteed to be accessible - they are standard types.
260 CallingConventions cc = Parameters.GetCallingConvention ();
262 mattr = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Virtual;
264 InvokeBuilder = TypeBuilder.DefineMethod ("Invoke",
271 // Define parameters, and count out/ref parameters
275 if (Parameters.FixedParameters != null){
276 int top = Parameters.FixedParameters.Length;
279 for (; i < top; i++) {
280 p = Parameters.FixedParameters [i];
281 p.DefineParameter (ec, InvokeBuilder, null, i + 1, Location);
283 if ((p.ModFlags & Parameter.Modifier.ISBYREF) != 0)
287 if (Parameters.ArrayParameter != null){
288 Parameter p = Parameters.ArrayParameter;
289 p.DefineParameter (ec, InvokeBuilder, null, i + 1, Location);
292 InvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
294 TypeManager.RegisterMethod (InvokeBuilder,
295 new InternalParameters (param_types, Parameters),
301 int params_num = param_types.Length;
302 Type [] async_param_types = new Type [params_num + 2];
304 param_types.CopyTo (async_param_types, 0);
306 async_param_types [params_num] = TypeManager.asynccallback_type;
307 async_param_types [params_num + 1] = TypeManager.object_type;
309 mattr = MethodAttributes.Public | MethodAttributes.HideBySig |
310 MethodAttributes.Virtual | MethodAttributes.NewSlot;
312 BeginInvokeBuilder = TypeBuilder.DefineMethod ("BeginInvoke",
315 TypeManager.iasyncresult_type,
319 if (Parameters.FixedParameters != null){
320 int top = Parameters.FixedParameters.Length;
323 for (i = 0 ; i < top; i++) {
324 p = Parameters.FixedParameters [i];
326 p.DefineParameter (ec, BeginInvokeBuilder, null, i + 1, Location);
329 if (Parameters.ArrayParameter != null){
330 Parameter p = Parameters.ArrayParameter;
331 p.DefineParameter (ec, BeginInvokeBuilder, null, i + 1, Location);
336 BeginInvokeBuilder.DefineParameter (i + 1, ParameterAttributes.None, "callback");
337 BeginInvokeBuilder.DefineParameter (i + 2, ParameterAttributes.None, "object");
339 BeginInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
341 Parameter [] async_params = new Parameter [params_num + 2];
343 if (Parameters.FixedParameters != null){
344 Parameters.FixedParameters.CopyTo (async_params, 0);
345 n = Parameters.FixedParameters.Length;
347 if (Parameters.ArrayParameter != null)
348 async_params [n] = Parameters.ArrayParameter;
350 async_params [params_num] = new Parameter (
351 TypeManager.system_asynccallback_expr, "callback",
352 Parameter.Modifier.NONE, null);
353 async_params [params_num + 1] = new Parameter (
354 TypeManager.system_object_expr, "object",
355 Parameter.Modifier.NONE, null);
357 Parameters async_parameters = new Parameters (async_params, null, Location);
358 async_parameters.ComputeAndDefineParameterTypes (ec);
360 TypeManager.RegisterMethod (BeginInvokeBuilder,
361 new InternalParameters (async_param_types, async_parameters),
365 // EndInvoke is a bit more interesting, all the parameters labeled as
366 // out or ref have to be duplicated here.
369 Type [] end_param_types = new Type [out_params + 1];
370 Parameter [] end_params = new Parameter [out_params + 1];
373 int top = Parameters.FixedParameters.Length;
374 for (i = 0; i < top; i++){
375 Parameter p = Parameters.FixedParameters [i];
376 if ((p.ModFlags & Parameter.Modifier.ISBYREF) == 0)
379 end_param_types [param] = param_types [i];
380 end_params [param] = p;
384 end_param_types [out_params] = TypeManager.iasyncresult_type;
385 end_params [out_params] = new Parameter (TypeManager.system_iasyncresult_expr, "result", Parameter.Modifier.NONE, null);
388 // Create method, define parameters, register parameters with type system
390 EndInvokeBuilder = TypeBuilder.DefineMethod ("EndInvoke", mattr, cc, ret_type, end_param_types);
391 EndInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
394 // EndInvoke: Label the parameters
396 EndInvokeBuilder.DefineParameter (out_params + 1, ParameterAttributes.None, "result");
397 for (i = 0; i < end_params.Length-1; i++){
398 EndInvokeBuilder.DefineParameter (i + 1, end_params [i].Attributes, end_params [i].Name);
401 Parameters end_parameters = new Parameters (end_params, null, Location);
402 end_parameters.ComputeAndDefineParameterTypes (ec);
404 TypeManager.RegisterMethod (
406 new InternalParameters (end_param_types, end_parameters),
412 public override void Emit ()
414 if (OptAttributes != null) {
415 Parameters.LabelParameters (ec, InvokeBuilder, Location);
416 OptAttributes.Emit (ec, this);
422 public override string[] ValidAttributeTargets {
424 return attribute_targets;
429 protected override bool VerifyClsCompliance (DeclSpace ds)
431 if (!base.VerifyClsCompliance (ds)) {
435 AttributeTester.AreParametersCompliant (Parameters.FixedParameters, Location);
437 if (!AttributeTester.IsClsCompliant (ReturnType.Type)) {
438 Report.Error (3002, Location, "Return type of '{0}' is not CLS-compliant", GetSignatureForError ());
444 // Returns the MethodBase for "Invoke" from a delegate type, this is used
445 // to extract the signature of a delegate.
447 public static MethodGroupExpr GetInvokeMethod (EmitContext ec, Type delegate_type,
450 Expression ml = Expression.MemberLookup (
451 ec, delegate_type, "Invoke", loc);
453 MethodGroupExpr mg = ml as MethodGroupExpr;
455 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
463 /// Verifies whether the method in question is compatible with the delegate
464 /// Returns the method itself if okay and null if not.
466 public static MethodBase VerifyMethod (EmitContext ec, Type delegate_type, MethodBase mb,
469 MethodGroupExpr mg = GetInvokeMethod (ec, delegate_type, loc);
473 MethodBase invoke_mb = mg.Methods [0];
474 ParameterData invoke_pd = Invocation.GetParameterData (invoke_mb);
476 if (!mg.HasTypeArguments &&
477 !TypeManager.InferTypeArguments (ec, invoke_pd, ref mb))
480 ParameterData pd = Invocation.GetParameterData (mb);
481 int pd_count = pd.Count;
483 if (invoke_pd.Count != pd_count)
486 for (int i = pd_count; i > 0; ) {
489 Type invoke_pd_type = invoke_pd.ParameterType (i);
490 Type pd_type = pd.ParameterType (i);
491 Parameter.Modifier invoke_pd_type_mod = invoke_pd.ParameterModifier (i);
492 Parameter.Modifier pd_type_mod = pd.ParameterModifier (i);
494 if (invoke_pd_type == pd_type &&
495 invoke_pd_type_mod == pd_type_mod)
498 if (invoke_pd_type.IsSubclassOf (pd_type) &&
499 invoke_pd_type_mod == pd_type_mod)
500 if (RootContext.Version == LanguageVersion.ISO_1) {
501 Report.FeatureIsNotStandardized (loc, "contravariance");
509 Type invoke_mb_retval = ((MethodInfo) invoke_mb).ReturnType;
510 Type mb_retval = ((MethodInfo) mb).ReturnType;
511 if (invoke_mb_retval == mb_retval)
514 if (mb_retval.IsSubclassOf (invoke_mb_retval))
515 if (RootContext.Version == LanguageVersion.ISO_1) {
516 Report.FeatureIsNotStandardized (loc, "covariance");
526 // Verifies whether the invocation arguments are compatible with the
527 // delegate's target method
529 public static bool VerifyApplicability (EmitContext ec, Type delegate_type,
530 ArrayList args, Location loc)
537 arg_count = args.Count;
539 Expression ml = Expression.MemberLookup (
540 ec, delegate_type, "Invoke", loc);
542 if (!(ml is MethodGroupExpr)) {
543 Report.Error (-100, loc, "Internal error: could not find Invoke method!" + delegate_type);
547 MethodBase mb = ((MethodGroupExpr) ml).Methods [0];
548 ParameterData pd = Invocation.GetParameterData (mb);
550 int pd_count = pd.Count;
552 bool params_method = (pd_count != 0) &&
553 (pd.ParameterModifier (pd_count - 1) == Parameter.Modifier.PARAMS);
555 if (!params_method && pd_count != arg_count) {
556 Report.Error (1593, loc,
557 "Delegate '{0}' does not take {1} arguments",
558 delegate_type.ToString (), arg_count);
563 // Consider the case:
564 // delegate void FOO(param object[] args);
565 // FOO f = new FOO(...);
566 // f(new object[] {1, 2, 3});
568 // This should be treated like f(1,2,3). This is done by ignoring the
569 // 'param' modifier for that invocation. If that fails, then the
570 // 'param' modifier is considered.
572 // One issue is that 'VerifyArgumentsCompat' modifies the elements of
573 // the 'args' array. However, the modifications appear idempotent.
574 // Normal 'Invocation's also have the same behaviour, implicitly.
578 if (arg_count == pd_count)
579 ans = Invocation.VerifyArgumentsCompat (
580 ec, args, arg_count, mb, false,
581 delegate_type, false, loc);
582 if (!ans && params_method)
583 ans = Invocation.VerifyArgumentsCompat (
584 ec, args, arg_count, mb, true,
585 delegate_type, false, loc);
590 /// Verifies whether the delegate in question is compatible with this one in
591 /// order to determine if instantiation from the same is possible.
593 public static bool VerifyDelegate (EmitContext ec, Type delegate_type, Type probe_type, Location loc)
595 Expression ml = Expression.MemberLookup (
596 ec, delegate_type, "Invoke", loc);
598 if (!(ml is MethodGroupExpr)) {
599 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
603 MethodBase mb = ((MethodGroupExpr) ml).Methods [0];
604 ParameterData pd = Invocation.GetParameterData (mb);
606 Expression probe_ml = Expression.MemberLookup (
607 ec, delegate_type, "Invoke", loc);
609 if (!(probe_ml is MethodGroupExpr)) {
610 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
614 MethodBase probe_mb = ((MethodGroupExpr) probe_ml).Methods [0];
615 ParameterData probe_pd = Invocation.GetParameterData (probe_mb);
617 if (((MethodInfo) mb).ReturnType != ((MethodInfo) probe_mb).ReturnType)
620 if (pd.Count != probe_pd.Count)
623 for (int i = pd.Count; i > 0; ) {
626 if (pd.ParameterType (i) != probe_pd.ParameterType (i) ||
627 pd.ParameterModifier (i) != probe_pd.ParameterModifier (i))
634 public static string FullDelegateDesc (Type del_type, MethodBase mb, ParameterData pd)
636 StringBuilder sb = new StringBuilder (TypeManager.CSharpName (((MethodInfo) mb).ReturnType));
638 sb.Append (" " + del_type.ToString ());
641 int length = pd.Count;
643 for (int i = length; i > 0; ) {
646 sb.Append (pd.ParameterDesc (length - i - 1));
652 return sb.ToString ();
656 // Hack around System.Reflection as found everywhere else
657 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
658 MemberFilter filter, object criteria)
660 ArrayList members = new ArrayList ();
662 if ((mt & MemberTypes.Method) != 0) {
663 if (ConstructorBuilder != null)
664 if (filter (ConstructorBuilder, criteria))
665 members.Add (ConstructorBuilder);
667 if (InvokeBuilder != null)
668 if (filter (InvokeBuilder, criteria))
669 members.Add (InvokeBuilder);
671 if (BeginInvokeBuilder != null)
672 if (filter (BeginInvokeBuilder, criteria))
673 members.Add (BeginInvokeBuilder);
675 if (EndInvokeBuilder != null)
676 if (filter (EndInvokeBuilder, criteria))
677 members.Add (EndInvokeBuilder);
680 return new MemberList (members);
683 public override MemberCache MemberCache {
689 public Expression InstanceExpression {
691 return instance_expr;
694 instance_expr = value;
698 public MethodBase TargetMethod {
700 return delegate_method;
703 delegate_method = value;
707 public Type TargetReturnType {
713 public Type [] ParameterTypes {
719 public override AttributeTargets AttributeTargets {
721 return AttributeTargets.Delegate;
726 // Represents header string for documentation comment.
728 public override string DocCommentHeader {
732 protected override void VerifyObsoleteAttribute()
734 CheckUsageOfObsoleteAttribute (ret_type);
736 foreach (Type type in param_types) {
737 CheckUsageOfObsoleteAttribute (type);
743 // Base class for `NewDelegate' and `ImplicitDelegateCreation'
745 public abstract class DelegateCreation : Expression {
746 protected MethodBase constructor_method;
747 protected MethodBase delegate_method;
748 protected MethodGroupExpr method_group;
749 protected Expression delegate_instance_expression;
751 public DelegateCreation () {}
753 public static void Error_NoMatchingMethodForDelegate (EmitContext ec, MethodGroupExpr mg, Type type, Location loc)
757 MethodBase candidate = mg.Methods [0];
758 if (mg.Methods.Length > 1)
759 method_desc = candidate.Name;
761 method_desc = Invocation.FullMethodDesc (candidate);
763 Expression invoke_method = Expression.MemberLookup (
764 ec, type, "Invoke", MemberTypes.Method,
765 Expression.AllBindingFlags, loc);
766 MethodBase method = ((MethodGroupExpr) invoke_method).Methods [0];
767 ParameterData param = Invocation.GetParameterData (method);
768 string delegate_desc = Delegate.FullDelegateDesc (type, method, param);
770 if (!mg.HasTypeArguments &&
771 !TypeManager.InferTypeArguments (ec, param, ref candidate))
772 Report.Error (411, loc, "The type arguments for " +
773 "method `{0}' cannot be infered from " +
774 "the usage. Try specifying the type " +
775 "arguments explicitly.", method_desc);
777 Report.Error (123, loc, "Method '{0}' does not " +
778 "match delegate '{1}'", method_desc,
782 public override void Emit (EmitContext ec)
784 if (delegate_instance_expression == null || delegate_method.IsStatic)
785 ec.ig.Emit (OpCodes.Ldnull);
787 delegate_instance_expression.Emit (ec);
789 if (delegate_method.IsVirtual && !method_group.IsBase) {
790 ec.ig.Emit (OpCodes.Dup);
791 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);
793 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);
794 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);
797 protected bool ResolveConstructorMethod (EmitContext ec)
799 Expression ml = Expression.MemberLookup (
800 ec, type, ".ctor", loc);
802 if (!(ml is MethodGroupExpr)) {
803 Report.Error (-100, loc, "Internal error: Could not find delegate constructor!");
807 constructor_method = ((MethodGroupExpr) ml).Methods [0];
811 protected Expression ResolveMethodGroupExpr (EmitContext ec, MethodGroupExpr mg)
813 foreach (MethodInfo mi in mg.Methods){
814 delegate_method = Delegate.VerifyMethod (
817 if (delegate_method != null)
821 if (delegate_method == null) {
822 Error_NoMatchingMethodForDelegate (ec, mg, type, loc);
827 // Check safe/unsafe of the delegate
830 ParameterData param = Invocation.GetParameterData (delegate_method);
831 int count = param.Count;
833 for (int i = 0; i < count; i++){
834 if (param.ParameterType (i).IsPointer){
835 Expression.UnsafeError (loc);
841 //TODO: implement caching when performance will be low
842 IMethodData md = TypeManager.GetMethod (delegate_method);
844 if (System.Attribute.GetCustomAttribute (delegate_method, TypeManager.conditional_attribute_type) != null) {
845 Report.Error (1618, loc, "Cannot create delegate with '{0}' because it has a Conditional attribute", TypeManager.CSharpSignature (delegate_method));
848 if (md.OptAttributes != null && md.OptAttributes.Search (TypeManager.conditional_attribute_type, ec) != null) {
849 Report.Error (1618, loc, "Cannot create delegate with '{0}' because it has a Conditional attribute", TypeManager.CSharpSignature (delegate_method));
853 if (mg.InstanceExpression != null)
854 delegate_instance_expression = mg.InstanceExpression.Resolve (ec);
855 else if (ec.IsStatic) {
856 if (!delegate_method.IsStatic) {
857 Report.Error (120, loc,
858 "An object reference is required for the non-static method " +
859 delegate_method.Name);
862 delegate_instance_expression = null;
864 delegate_instance_expression = ec.GetThis (loc);
866 if (delegate_instance_expression != null && delegate_instance_expression.Type.IsValueType)
867 delegate_instance_expression = new BoxedCast (delegate_instance_expression);
870 eclass = ExprClass.Value;
876 // Created from the conversion code
878 public class ImplicitDelegateCreation : DelegateCreation {
880 ImplicitDelegateCreation (Type t, Location l)
886 public override Expression DoResolve (EmitContext ec)
891 static public Expression Create (EmitContext ec, MethodGroupExpr mge, Type target_type, Location loc)
893 ImplicitDelegateCreation d = new ImplicitDelegateCreation (target_type, loc);
894 if (d.ResolveConstructorMethod (ec))
895 return d.ResolveMethodGroupExpr (ec, mge);
902 // A delegate-creation-expression, invoked from the `New' class
904 public class NewDelegate : DelegateCreation {
905 public ArrayList Arguments;
908 // This constructor is invoked from the `New' expression
910 public NewDelegate (Type type, ArrayList Arguments, Location loc)
913 this.Arguments = Arguments;
917 public override Expression DoResolve (EmitContext ec)
919 if (Arguments == null || Arguments.Count != 1) {
920 Report.Error (149, loc,
921 "Method name expected");
925 if (!ResolveConstructorMethod (ec))
928 Argument a = (Argument) Arguments [0];
930 if (!a.ResolveMethodGroup (ec, loc))
933 Expression e = a.Expr;
935 if (e is AnonymousMethod && RootContext.Version != LanguageVersion.ISO_1)
936 return ((AnonymousMethod) e).Compatible (ec, type, false);
938 MethodGroupExpr mg = e as MethodGroupExpr;
940 return ResolveMethodGroupExpr (ec, mg);
942 Type e_type = e.Type;
944 if (!TypeManager.IsDelegateType (e_type)) {
945 Report.Error (149, loc, "Method name expected");
949 method_group = Expression.MemberLookup (
950 ec, type, "Invoke", MemberTypes.Method,
951 Expression.AllBindingFlags, loc) as MethodGroupExpr;
953 if (method_group == null) {
954 Report.Error (-200, loc, "Internal error ! Could not find Invoke method!");
958 // This is what MS' compiler reports. We could always choose
959 // to be more verbose and actually give delegate-level specifics
960 if (!Delegate.VerifyDelegate (ec, type, e_type, loc)) {
961 Report.Error (29, loc, "Cannot implicitly convert type '" + e_type + "' " +
962 "to type '" + type + "'");
966 delegate_instance_expression = e;
967 delegate_method = method_group.Methods [0];
969 eclass = ExprClass.Value;
974 public class DelegateInvocation : ExpressionStatement {
976 public Expression InstanceExpr;
977 public ArrayList Arguments;
981 public DelegateInvocation (Expression instance_expr, ArrayList args, Location loc)
983 this.InstanceExpr = instance_expr;
984 this.Arguments = args;
988 public override Expression DoResolve (EmitContext ec)
990 if (InstanceExpr is EventExpr) {
992 EventInfo ei = ((EventExpr) InstanceExpr).EventInfo;
994 Expression ml = MemberLookup (
995 ec, ec.ContainerType, ei.Name,
996 MemberTypes.Event, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
1000 // If this is the case, then the Event does not belong
1001 // to this Type and so, according to the spec
1002 // cannot be accessed directly
1004 // Note that target will not appear as an EventExpr
1005 // in the case it is being referenced within the same type container;
1006 // it will appear as a FieldExpr in that case.
1009 Assign.error70 (ei, loc);
1015 Type del_type = InstanceExpr.Type;
1016 if (del_type == null)
1019 if (Arguments != null){
1020 foreach (Argument a in Arguments){
1021 if (!a.Resolve (ec, loc))
1026 if (!Delegate.VerifyApplicability (ec, del_type, Arguments, loc))
1029 Expression lookup = Expression.MemberLookup (ec, del_type, "Invoke", loc);
1030 if (!(lookup is MethodGroupExpr)) {
1031 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
1035 method = ((MethodGroupExpr) lookup).Methods [0];
1036 type = ((MethodInfo) method).ReturnType;
1037 eclass = ExprClass.Value;
1042 public override void Emit (EmitContext ec)
1045 // Invocation on delegates call the virtual Invoke member
1046 // so we are always `instance' calls
1048 Invocation.EmitCall (ec, false, false, InstanceExpr, method, Arguments, loc);
1051 public override void EmitStatement (EmitContext ec)
1055 // Pop the return value if there is one
1057 if (method is MethodInfo){
1058 if (((MethodInfo) method).ReturnType != TypeManager.void_type)
1059 ec.ig.Emit (OpCodes.Pop);