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 Expression current = new SimpleName (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 param_types = Parameters.GetParameterInfo (ec);
213 if (param_types == null)
220 // Check accessibility
221 foreach (Type partype in param_types){
222 if (!Parent.AsAccessible (partype, ModFlags)) {
223 Report.Error (59, Location,
224 "Inconsistent accessibility: parameter type `" +
225 TypeManager.CSharpName (partype) + "` is less " +
226 "accessible than delegate `" + Name + "'");
229 if (partype.IsPointer && !UnsafeOK (Parent))
233 ReturnType = ReturnType.ResolveAsTypeTerminal (ec);
234 if (ReturnType == null)
237 ret_type = ReturnType.Type;
238 if (ret_type == null)
241 if (!Parent.AsAccessible (ret_type, ModFlags)) {
242 Report.Error (58, Location,
243 "Inconsistent accessibility: return type `" +
244 TypeManager.CSharpName (ret_type) + "` is less " +
245 "accessible than delegate `" + Name + "'");
249 if (ret_type.IsPointer && !UnsafeOK (Parent))
252 if (RootContext.StdLib && (ret_type == TypeManager.arg_iterator_type || ret_type == TypeManager.typed_reference_type)) {
253 Method.Error1599 (Location, ret_type);
258 // We don't have to check any others because they are all
259 // guaranteed to be accessible - they are standard types.
262 CallingConventions cc = Parameters.GetCallingConvention ();
264 mattr = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Virtual;
266 InvokeBuilder = TypeBuilder.DefineMethod ("Invoke",
273 // Define parameters, and count out/ref parameters
277 if (Parameters.FixedParameters != null){
278 int top = Parameters.FixedParameters.Length;
281 for (; i < top; i++) {
282 p = Parameters.FixedParameters [i];
283 p.DefineParameter (ec, InvokeBuilder, null, i + 1, Location);
285 if ((p.ModFlags & Parameter.Modifier.ISBYREF) != 0)
289 if (Parameters.ArrayParameter != null){
290 Parameter p = Parameters.ArrayParameter;
291 p.DefineParameter (ec, InvokeBuilder, null, i + 1, Location);
294 InvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
296 TypeManager.RegisterMethod (InvokeBuilder,
297 new InternalParameters (param_types, Parameters),
303 int params_num = param_types.Length;
304 Type [] async_param_types = new Type [params_num + 2];
306 param_types.CopyTo (async_param_types, 0);
308 async_param_types [params_num] = TypeManager.asynccallback_type;
309 async_param_types [params_num + 1] = TypeManager.object_type;
311 mattr = MethodAttributes.Public | MethodAttributes.HideBySig |
312 MethodAttributes.Virtual | MethodAttributes.NewSlot;
314 BeginInvokeBuilder = TypeBuilder.DefineMethod ("BeginInvoke",
317 TypeManager.iasyncresult_type,
321 if (Parameters.FixedParameters != null){
322 int top = Parameters.FixedParameters.Length;
325 for (i = 0 ; i < top; i++) {
326 p = Parameters.FixedParameters [i];
328 p.DefineParameter (ec, BeginInvokeBuilder, null, i + 1, Location);
331 if (Parameters.ArrayParameter != null){
332 Parameter p = Parameters.ArrayParameter;
333 p.DefineParameter (ec, BeginInvokeBuilder, null, i + 1, Location);
338 BeginInvokeBuilder.DefineParameter (i + 1, ParameterAttributes.None, "callback");
339 BeginInvokeBuilder.DefineParameter (i + 2, ParameterAttributes.None, "object");
341 BeginInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
343 Parameter [] async_params = new Parameter [params_num + 2];
345 if (Parameters.FixedParameters != null){
346 Parameters.FixedParameters.CopyTo (async_params, 0);
347 n = Parameters.FixedParameters.Length;
349 if (Parameters.ArrayParameter != null)
350 async_params [n] = Parameters.ArrayParameter;
352 async_params [params_num] = new Parameter (
353 TypeManager.system_asynccallback_expr, "callback",
354 Parameter.Modifier.NONE, null);
355 async_params [params_num + 1] = new Parameter (
356 TypeManager.system_object_expr, "object",
357 Parameter.Modifier.NONE, null);
359 Parameters async_parameters = new Parameters (async_params, null, Location);
361 TypeManager.RegisterMethod (BeginInvokeBuilder,
362 new InternalParameters (async_parameters.GetParameterInfo (ec), async_parameters),
366 // EndInvoke is a bit more interesting, all the parameters labeled as
367 // out or ref have to be duplicated here.
370 Type [] end_param_types = new Type [out_params + 1];
371 Parameter [] end_params = new Parameter [out_params + 1];
374 int top = Parameters.FixedParameters.Length;
375 for (i = 0; i < top; i++){
376 Parameter p = Parameters.FixedParameters [i];
377 if ((p.ModFlags & Parameter.Modifier.ISBYREF) == 0)
380 end_param_types [param] = param_types [i];
381 end_params [param] = p;
385 end_param_types [out_params] = TypeManager.iasyncresult_type;
386 end_params [out_params] = new Parameter (TypeManager.system_iasyncresult_expr, "result", Parameter.Modifier.NONE, null);
389 // Create method, define parameters, register parameters with type system
391 EndInvokeBuilder = TypeBuilder.DefineMethod ("EndInvoke", mattr, cc, ret_type, end_param_types);
392 EndInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);
395 // EndInvoke: Label the parameters
397 EndInvokeBuilder.DefineParameter (out_params + 1, ParameterAttributes.None, "result");
398 for (i = 0; i < end_params.Length-1; i++){
399 EndInvokeBuilder.DefineParameter (i + 1, end_params [i].Attributes, end_params [i].Name);
402 Parameters end_parameters = new Parameters (end_params, null, Location);
404 TypeManager.RegisterMethod (
406 new InternalParameters (end_parameters.GetParameterInfo (ec), 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 = TypeManager.GetParameterData (invoke_mb);
476 if (!mg.HasTypeArguments &&
477 !TypeManager.InferTypeArguments (ec, invoke_pd, ref mb))
480 ParameterData pd = TypeManager.GetParameterData (mb);
482 if (invoke_pd.Count != pd.Count)
485 for (int i = pd.Count; i > 0; ) {
488 Type invoke_pd_type = invoke_pd.ParameterType (i);
489 Type pd_type = pd.ParameterType (i);
490 Parameter.Modifier invoke_pd_type_mod = invoke_pd.ParameterModifier (i);
491 Parameter.Modifier pd_type_mod = pd.ParameterModifier (i);
493 if (invoke_pd_type == pd_type &&
494 invoke_pd_type_mod == pd_type_mod)
497 if (invoke_pd_type.IsSubclassOf (pd_type) &&
498 invoke_pd_type_mod == pd_type_mod)
499 if (RootContext.Version == LanguageVersion.ISO_1) {
500 Report.FeatureIsNotStandardized (loc, "contravariance");
508 Type invoke_mb_retval = ((MethodInfo) invoke_mb).ReturnType;
509 Type mb_retval = ((MethodInfo) mb).ReturnType;
510 if (invoke_mb_retval == mb_retval)
513 if (mb_retval.IsSubclassOf (invoke_mb_retval))
514 if (RootContext.Version == LanguageVersion.ISO_1) {
515 Report.FeatureIsNotStandardized (loc, "covariance");
525 // Verifies whether the invocation arguments are compatible with the
526 // delegate's target method
528 public static bool VerifyApplicability (EmitContext ec, Type delegate_type,
529 ArrayList args, Location loc)
536 arg_count = args.Count;
538 Expression ml = Expression.MemberLookup (
539 ec, delegate_type, "Invoke", loc);
541 MethodGroupExpr me = ml as MethodGroupExpr;
543 Report.Error (-100, loc, "Internal error: could not find Invoke method!" + delegate_type);
547 MethodBase mb = me.Methods [0];
548 ParameterData pd = TypeManager.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 bool is_params_applicable = false;
556 bool is_applicable = Invocation.IsApplicable (ec, me, args, arg_count, ref mb);
558 if (!is_applicable && params_method &&
559 Invocation.IsParamsMethodApplicable (ec, me, args, arg_count, ref mb))
560 is_applicable = is_params_applicable = true;
562 if (!is_applicable && !params_method && arg_count != pd_count) {
563 Report.Error (1593, loc,
564 "Delegate '{0}' does not take {1} arguments",
565 delegate_type.ToString (), arg_count);
569 return Invocation.VerifyArgumentsCompat (
570 ec, args, arg_count, mb,
571 is_params_applicable || (!is_applicable && params_method),
572 delegate_type, false, loc);
576 /// Verifies whether the delegate in question is compatible with this one in
577 /// order to determine if instantiation from the same is possible.
579 public static bool VerifyDelegate (EmitContext ec, Type delegate_type, Type probe_type, Location loc)
581 Expression ml = Expression.MemberLookup (
582 ec, delegate_type, "Invoke", loc);
584 if (!(ml is MethodGroupExpr)) {
585 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
589 MethodBase mb = ((MethodGroupExpr) ml).Methods [0];
590 ParameterData pd = TypeManager.GetParameterData (mb);
592 Expression probe_ml = Expression.MemberLookup (
593 ec, delegate_type, "Invoke", loc);
595 if (!(probe_ml is MethodGroupExpr)) {
596 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
600 MethodBase probe_mb = ((MethodGroupExpr) probe_ml).Methods [0];
601 ParameterData probe_pd = TypeManager.GetParameterData (probe_mb);
603 if (((MethodInfo) mb).ReturnType != ((MethodInfo) probe_mb).ReturnType)
606 if (pd.Count != probe_pd.Count)
609 for (int i = pd.Count; i > 0; ) {
612 if (pd.ParameterType (i) != probe_pd.ParameterType (i) ||
613 pd.ParameterModifier (i) != probe_pd.ParameterModifier (i))
620 public static string FullDelegateDesc (Type del_type, MethodBase mb, ParameterData pd)
622 StringBuilder sb = new StringBuilder (TypeManager.CSharpName (((MethodInfo) mb).ReturnType));
624 sb.Append (" " + del_type.ToString ());
627 int length = pd.Count;
629 for (int i = length; i > 0; ) {
632 sb.Append (pd.ParameterDesc (length - i - 1));
638 return sb.ToString ();
642 // Hack around System.Reflection as found everywhere else
643 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
644 MemberFilter filter, object criteria)
646 ArrayList members = new ArrayList ();
648 if ((mt & MemberTypes.Method) != 0) {
649 if (ConstructorBuilder != null)
650 if (filter (ConstructorBuilder, criteria))
651 members.Add (ConstructorBuilder);
653 if (InvokeBuilder != null)
654 if (filter (InvokeBuilder, criteria))
655 members.Add (InvokeBuilder);
657 if (BeginInvokeBuilder != null)
658 if (filter (BeginInvokeBuilder, criteria))
659 members.Add (BeginInvokeBuilder);
661 if (EndInvokeBuilder != null)
662 if (filter (EndInvokeBuilder, criteria))
663 members.Add (EndInvokeBuilder);
666 return new MemberList (members);
669 public override MemberCache MemberCache {
675 public Expression InstanceExpression {
677 return instance_expr;
680 instance_expr = value;
684 public MethodBase TargetMethod {
686 return delegate_method;
689 delegate_method = value;
693 public Type TargetReturnType {
699 public Type [] ParameterTypes {
705 public override AttributeTargets AttributeTargets {
707 return AttributeTargets.Delegate;
712 // Represents header string for documentation comment.
714 public override string DocCommentHeader {
718 protected override void VerifyObsoleteAttribute()
720 CheckUsageOfObsoleteAttribute (ret_type);
722 foreach (Type type in param_types) {
723 CheckUsageOfObsoleteAttribute (type);
729 // Base class for `NewDelegate' and `ImplicitDelegateCreation'
731 public abstract class DelegateCreation : Expression {
732 protected MethodBase constructor_method;
733 protected MethodBase delegate_method;
734 protected MethodGroupExpr method_group;
735 protected Expression delegate_instance_expression;
737 public DelegateCreation () {}
739 public static void Error_NoMatchingMethodForDelegate (EmitContext ec, MethodGroupExpr mg, Type type, Location loc)
743 MethodBase candidate = mg.Methods [0];
744 if (mg.Methods.Length > 1)
745 method_desc = candidate.Name;
747 method_desc = Invocation.FullMethodDesc (candidate);
749 Expression invoke_method = Expression.MemberLookup (
750 ec, type, "Invoke", MemberTypes.Method,
751 Expression.AllBindingFlags, loc);
752 MethodBase method = ((MethodGroupExpr) invoke_method).Methods [0];
753 ParameterData param = TypeManager.GetParameterData (method);
754 string delegate_desc = Delegate.FullDelegateDesc (type, method, param);
756 if (!mg.HasTypeArguments &&
757 !TypeManager.InferTypeArguments (ec, param, ref candidate))
758 Report.Error (411, loc, "The type arguments for " +
759 "method `{0}' cannot be infered from " +
760 "the usage. Try specifying the type " +
761 "arguments explicitly.", method_desc);
763 Report.Error (123, loc, "Method '{0}' does not " +
764 "match delegate '{1}'", method_desc,
768 public override void Emit (EmitContext ec)
770 if (delegate_instance_expression == null || delegate_method.IsStatic)
771 ec.ig.Emit (OpCodes.Ldnull);
773 delegate_instance_expression.Emit (ec);
775 if (delegate_method.IsVirtual && !method_group.IsBase) {
776 ec.ig.Emit (OpCodes.Dup);
777 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);
779 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);
780 ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);
783 protected bool ResolveConstructorMethod (EmitContext ec)
785 Expression ml = Expression.MemberLookup (
786 ec, type, ".ctor", loc);
788 if (!(ml is MethodGroupExpr)) {
789 Report.Error (-100, loc, "Internal error: Could not find delegate constructor!");
793 constructor_method = ((MethodGroupExpr) ml).Methods [0];
797 protected Expression ResolveMethodGroupExpr (EmitContext ec, MethodGroupExpr mg)
799 foreach (MethodInfo mi in mg.Methods){
800 delegate_method = Delegate.VerifyMethod (ec, type, mi, loc);
802 if (delegate_method != null)
806 if (delegate_method == null) {
807 Error_NoMatchingMethodForDelegate (ec, mg, type, loc);
812 // Check safe/unsafe of the delegate
815 ParameterData param = TypeManager.GetParameterData (delegate_method);
816 int count = param.Count;
818 for (int i = 0; i < count; i++){
819 if (param.ParameterType (i).IsPointer){
820 Expression.UnsafeError (loc);
826 //TODO: implement caching when performance will be low
827 IMethodData md = TypeManager.GetMethod (delegate_method);
829 if (System.Attribute.GetCustomAttribute (delegate_method, TypeManager.conditional_attribute_type) != null) {
830 Report.Error (1618, loc, "Cannot create delegate with '{0}' because it has a Conditional attribute", TypeManager.CSharpSignature (delegate_method));
833 if (md.OptAttributes != null && md.OptAttributes.Search (TypeManager.conditional_attribute_type, ec) != null) {
834 Report.Error (1618, loc, "Cannot create delegate with '{0}' because it has a Conditional attribute", TypeManager.CSharpSignature (delegate_method));
838 if (mg.InstanceExpression != null)
839 delegate_instance_expression = mg.InstanceExpression.Resolve (ec);
840 else if (ec.IsStatic) {
841 if (!delegate_method.IsStatic) {
842 Report.Error (120, loc,
843 "An object reference is required for the non-static method " +
844 delegate_method.Name);
847 delegate_instance_expression = null;
849 delegate_instance_expression = ec.GetThis (loc);
851 if (delegate_instance_expression != null && delegate_instance_expression.Type.IsValueType)
852 delegate_instance_expression = new BoxedCast (delegate_instance_expression);
855 eclass = ExprClass.Value;
861 // Created from the conversion code
863 public class ImplicitDelegateCreation : DelegateCreation {
865 ImplicitDelegateCreation (Type t, Location l)
871 public override Expression DoResolve (EmitContext ec)
876 static public Expression Create (EmitContext ec, MethodGroupExpr mge, Type target_type, Location loc)
878 ImplicitDelegateCreation d = new ImplicitDelegateCreation (target_type, loc);
879 if (d.ResolveConstructorMethod (ec))
880 return d.ResolveMethodGroupExpr (ec, mge);
887 // A delegate-creation-expression, invoked from the `New' class
889 public class NewDelegate : DelegateCreation {
890 public ArrayList Arguments;
893 // This constructor is invoked from the `New' expression
895 public NewDelegate (Type type, ArrayList Arguments, Location loc)
898 this.Arguments = Arguments;
902 public override Expression DoResolve (EmitContext ec)
904 if (Arguments == null || Arguments.Count != 1) {
905 Report.Error (149, loc,
906 "Method name expected");
910 if (!ResolveConstructorMethod (ec))
913 Argument a = (Argument) Arguments [0];
915 if (!a.ResolveMethodGroup (ec, loc))
918 Expression e = a.Expr;
920 if (e is AnonymousMethod && RootContext.Version != LanguageVersion.ISO_1)
921 return ((AnonymousMethod) e).Compatible (ec, type, false);
923 MethodGroupExpr mg = e as MethodGroupExpr;
925 return ResolveMethodGroupExpr (ec, mg);
927 Type e_type = e.Type;
929 if (!TypeManager.IsDelegateType (e_type)) {
930 Report.Error (149, loc, "Method name expected");
934 method_group = Expression.MemberLookup (
935 ec, type, "Invoke", MemberTypes.Method,
936 Expression.AllBindingFlags, loc) as MethodGroupExpr;
938 if (method_group == null) {
939 Report.Error (-200, loc, "Internal error ! Could not find Invoke method!");
943 // This is what MS' compiler reports. We could always choose
944 // to be more verbose and actually give delegate-level specifics
945 if (!Delegate.VerifyDelegate (ec, type, e_type, loc)) {
946 Report.Error (29, loc, "Cannot implicitly convert type '" + e_type + "' " +
947 "to type '" + type + "'");
951 delegate_instance_expression = e;
952 delegate_method = method_group.Methods [0];
954 eclass = ExprClass.Value;
959 public class DelegateInvocation : ExpressionStatement {
961 public Expression InstanceExpr;
962 public ArrayList Arguments;
966 public DelegateInvocation (Expression instance_expr, ArrayList args, Location loc)
968 this.InstanceExpr = instance_expr;
969 this.Arguments = args;
973 public override Expression DoResolve (EmitContext ec)
975 if (InstanceExpr is EventExpr) {
977 EventInfo ei = ((EventExpr) InstanceExpr).EventInfo;
979 Expression ml = MemberLookup (
980 ec, ec.ContainerType, ei.Name,
981 MemberTypes.Event, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
985 // If this is the case, then the Event does not belong
986 // to this Type and so, according to the spec
987 // cannot be accessed directly
989 // Note that target will not appear as an EventExpr
990 // in the case it is being referenced within the same type container;
991 // it will appear as a FieldExpr in that case.
994 Assign.error70 (ei, loc);
1000 Type del_type = InstanceExpr.Type;
1001 if (del_type == null)
1004 if (Arguments != null){
1005 foreach (Argument a in Arguments){
1006 if (!a.Resolve (ec, loc))
1011 if (!Delegate.VerifyApplicability (ec, del_type, Arguments, loc))
1014 Expression lookup = Expression.MemberLookup (ec, del_type, "Invoke", loc);
1015 if (!(lookup is MethodGroupExpr)) {
1016 Report.Error (-100, loc, "Internal error: could not find Invoke method!");
1020 method = ((MethodGroupExpr) lookup).Methods [0];
1021 type = ((MethodInfo) method).ReturnType;
1022 eclass = ExprClass.Value;
1027 public override void Emit (EmitContext ec)
1030 // Invocation on delegates call the virtual Invoke member
1031 // so we are always `instance' calls
1033 Invocation.EmitCall (ec, false, false, InstanceExpr, method, Arguments, loc);
1036 public override void EmitStatement (EmitContext ec)
1040 // Pop the return value if there is one
1042 if (method is MethodInfo){
1043 if (((MethodInfo) method).ReturnType != TypeManager.void_type)
1044 ec.ig.Emit (OpCodes.Pop);