2 // dynamic.cs: support for dynamic expressions
4 // Authors: Marek Safar (marek.safar@gmail.com)
6 // Dual licensed under the terms of the MIT X11 or GNU GPL
8 // Copyright 2009 Novell, Inc
9 // Copyright 2011 Xamarin Inc.
14 using SLE = System.Linq.Expressions;
20 // A copy of Microsoft.CSharp/Microsoft.CSharp.RuntimeBinder/CSharpBinderFlags.cs
21 // has to be kept in sync
24 public enum CSharpBinderFlags
28 InvokeSimpleName = 1 << 1,
29 InvokeSpecialName = 1 << 2,
30 BinaryOperationLogical = 1 << 3,
31 ConvertExplicit = 1 << 4,
32 ConvertArrayIndex = 1 << 5,
33 ResultIndexed = 1 << 6,
34 ValueFromCompoundAssignment = 1 << 7,
35 ResultDiscarded = 1 << 8
39 // Type expression with internal dynamic type symbol
41 class DynamicTypeExpr : TypeExpr
43 public DynamicTypeExpr (Location loc)
48 public override TypeSpec ResolveAsType (IMemberContext ec, bool allowUnboundTypeArguments)
50 eclass = ExprClass.Type;
51 type = ec.Module.Compiler.BuiltinTypes.Dynamic;
56 #region Dynamic runtime binder expressions
59 // Expression created from runtime dynamic object value by dynamic binder
61 public class RuntimeValueExpression : Expression, IDynamicAssign, IMemoryLocation
64 readonly DynamicMetaObject obj;
66 public RuntimeValueExpression (DynamicMetaObject obj, TypeSpec type)
70 this.eclass = ExprClass.Variable;
75 public bool IsSuggestionOnly { get; set; }
77 public DynamicMetaObject MetaObject {
83 public void AddressOf (EmitContext ec, AddressOp mode)
85 throw new NotImplementedException ();
88 public override bool ContainsEmitWithAwait ()
90 throw new NotSupportedException ();
93 public override Expression CreateExpressionTree (ResolveContext ec)
95 throw new NotSupportedException ();
98 protected override Expression DoResolve (ResolveContext ec)
103 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
108 public override void Emit (EmitContext ec)
110 throw new NotImplementedException ();
113 #region IAssignMethod Members
115 public void Emit (EmitContext ec, bool leave_copy)
117 throw new NotImplementedException ();
120 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
122 throw new NotImplementedException ();
127 public SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source)
129 return obj.Expression;
132 public override SLE.Expression MakeExpression (BuilderContext ctx)
135 return base.MakeExpression (ctx);
138 if (type.IsStruct && !obj.Expression.Type.IsValueType)
139 return SLE.Expression.Unbox (obj.Expression, type.GetMetaInfo ());
141 if (obj.Expression.NodeType == SLE.ExpressionType.Parameter) {
142 if (((SLE.ParameterExpression) obj.Expression).IsByRef)
143 return obj.Expression;
146 return SLE.Expression.Convert (obj.Expression, type.GetMetaInfo ());
152 // Wraps runtime dynamic expression into expected type. Needed
153 // to satify expected type check by dynamic binder and no conversion
154 // is required (ResultDiscarded).
156 public class DynamicResultCast : ShimExpression
158 public DynamicResultCast (TypeSpec type, Expression expr)
164 protected override Expression DoResolve (ResolveContext ec)
166 expr = expr.Resolve (ec);
167 eclass = ExprClass.Value;
171 public override SLE.Expression MakeExpression (BuilderContext ctx)
174 return base.MakeExpression (ctx);
176 return SLE.Expression.Block (expr.MakeExpression (ctx), SLE.Expression.Default (type.GetMetaInfo ()));
184 // Creates dynamic binder expression
186 interface IDynamicBinder
188 Expression CreateCallSiteBinder (ResolveContext ec, Arguments args);
192 // Extends standard assignment interface for expressions
193 // supported by dynamic resolver
195 interface IDynamicAssign : IAssignMethod
197 SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source);
201 // Base dynamic expression statement creator
203 class DynamicExpressionStatement : ExpressionStatement
206 // Binder flag dynamic constant, the value is combination of
207 // flags known at resolve stage and flags known only at emit
210 protected class BinderFlags : EnumConstant
212 readonly DynamicExpressionStatement statement;
213 readonly CSharpBinderFlags flags;
215 public BinderFlags (CSharpBinderFlags flags, DynamicExpressionStatement statement)
216 : base (statement.loc)
219 this.statement = statement;
223 protected override Expression DoResolve (ResolveContext ec)
225 Child = new IntConstant (ec.BuiltinTypes, (int) (flags | statement.flags), statement.loc);
227 type = ec.Module.PredefinedTypes.BinderFlags.Resolve ();
228 eclass = Child.eclass;
233 readonly Arguments arguments;
234 protected IDynamicBinder binder;
235 protected Expression binder_expr;
237 // Used by BinderFlags
238 protected CSharpBinderFlags flags;
240 TypeSpec binder_type;
241 TypeParameters context_mvars;
243 public DynamicExpressionStatement (IDynamicBinder binder, Arguments args, Location loc)
245 this.binder = binder;
246 this.arguments = args;
250 public Arguments Arguments {
256 public override bool ContainsEmitWithAwait ()
258 return arguments.ContainsEmitWithAwait ();
261 public override Expression CreateExpressionTree (ResolveContext ec)
263 ec.Report.Error (1963, loc, "An expression tree cannot contain a dynamic operation");
267 protected override Expression DoResolve (ResolveContext rc)
269 if (DoResolveCore (rc))
270 binder_expr = binder.CreateCallSiteBinder (rc, arguments);
275 protected bool DoResolveCore (ResolveContext rc)
277 foreach (var arg in arguments) {
278 if (arg.Type == InternalType.VarOutType) {
279 // Should be special error message about dynamic dispatch
280 rc.Report.Error (8047, arg.Expr.Location, "Declaration expression cannot be used in this context");
284 if (rc.CurrentTypeParameters != null && rc.CurrentTypeParameters[0].IsMethodTypeParameter)
285 context_mvars = rc.CurrentTypeParameters;
287 int errors = rc.Report.Errors;
288 var pt = rc.Module.PredefinedTypes;
290 binder_type = pt.Binder.Resolve ();
291 pt.CallSite.Resolve ();
292 pt.CallSiteGeneric.Resolve ();
294 eclass = ExprClass.Value;
297 type = rc.BuiltinTypes.Dynamic;
299 if (rc.Report.Errors == errors)
302 rc.Report.Error (1969, loc,
303 "Dynamic operation cannot be compiled without `Microsoft.CSharp.dll' assembly reference");
307 public override void Emit (EmitContext ec)
309 EmitCall (ec, binder_expr, arguments, false);
312 public override void EmitStatement (EmitContext ec)
314 EmitCall (ec, binder_expr, arguments, true);
317 protected void EmitCall (EmitContext ec, Expression binder, Arguments arguments, bool isStatement)
320 // This method generates all internal infrastructure for a dynamic call. The
321 // reason why it's quite complicated is the mixture of dynamic and anonymous
322 // methods. Dynamic itself requires a temporary class (ContainerX) and anonymous
323 // methods can generate temporary storey as well (AnonStorey). Handling MVAR
324 // type parameters rewrite is non-trivial in such case as there are various
325 // combinations possible therefore the mutator is not straightforward. Secondly
326 // we need to keep both MVAR(possibly VAR for anon storey) and type VAR to emit
327 // correct Site field type and its access from EmitContext.
330 int dyn_args_count = arguments == null ? 0 : arguments.Count;
331 int default_args = isStatement ? 1 : 2;
332 var module = ec.Module;
334 bool has_ref_out_argument = false;
335 var targs = new TypeExpression[dyn_args_count + default_args];
336 targs[0] = new TypeExpression (module.PredefinedTypes.CallSite.TypeSpec, loc);
338 TypeExpression[] targs_for_instance = null;
339 TypeParameterMutator mutator;
341 var site_container = ec.CreateDynamicSite ();
343 if (context_mvars != null) {
344 TypeParameters tparam;
345 TypeContainer sc = site_container;
347 tparam = sc.CurrentTypeParameters;
349 } while (tparam == null);
351 mutator = new TypeParameterMutator (context_mvars, tparam);
353 if (!ec.IsAnonymousStoreyMutateRequired) {
354 targs_for_instance = new TypeExpression[targs.Length];
355 targs_for_instance[0] = targs[0];
361 for (int i = 0; i < dyn_args_count; ++i) {
362 Argument a = arguments[i];
363 if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
364 has_ref_out_argument = true;
368 // Convert any internal type like dynamic or null to object
369 if (t.Kind == MemberKind.InternalCompilerType)
370 t = ec.BuiltinTypes.Object;
372 if (targs_for_instance != null)
373 targs_for_instance[i + 1] = new TypeExpression (t, loc);
376 t = t.Mutate (mutator);
378 targs[i + 1] = new TypeExpression (t, loc);
381 TypeExpr del_type = null;
382 TypeExpr del_type_instance_access = null;
383 if (!has_ref_out_argument) {
384 string d_name = isStatement ? "Action" : "Func";
387 Namespace type_ns = module.GlobalRootNamespace.GetNamespace ("System", true);
388 if (type_ns != null) {
389 te = type_ns.LookupType (module, d_name, dyn_args_count + default_args, LookupMode.Normal, loc);
395 if (t.Kind == MemberKind.InternalCompilerType)
396 t = ec.BuiltinTypes.Object;
398 if (targs_for_instance != null)
399 targs_for_instance[targs_for_instance.Length - 1] = new TypeExpression (t, loc);
402 t = t.Mutate (mutator);
404 targs[targs.Length - 1] = new TypeExpression (t, loc);
407 del_type = new GenericTypeExpr (te, new TypeArguments (targs), loc);
408 if (targs_for_instance != null)
409 del_type_instance_access = new GenericTypeExpr (te, new TypeArguments (targs_for_instance), loc);
411 del_type_instance_access = del_type;
416 // Create custom delegate when no appropriate predefined delegate has been found
419 if (del_type == null) {
420 TypeSpec rt = isStatement ? ec.BuiltinTypes.Void : type;
421 Parameter[] p = new Parameter[dyn_args_count + 1];
422 p[0] = new Parameter (targs[0], "p0", Parameter.Modifier.NONE, null, loc);
424 var site = ec.CreateDynamicSite ();
425 int index = site.Containers == null ? 0 : site.Containers.Count;
428 rt = mutator.Mutate (rt);
430 for (int i = 1; i < dyn_args_count + 1; ++i) {
431 p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
434 d = new Delegate (site, new TypeExpression (rt, loc),
435 Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
436 new MemberName ("Container" + index.ToString ("X")),
437 new ParametersCompiled (p), null);
439 d.CreateContainer ();
440 d.DefineContainer ();
444 site.AddTypeContainer (d);
447 // Add new container to inflated site container when the
448 // member cache already exists
450 if (site.CurrentType is InflatedTypeSpec && index > 0)
451 site.CurrentType.MemberCache.AddMember (d.CurrentType);
453 del_type = new TypeExpression (d.CurrentType, loc);
454 if (targs_for_instance != null) {
455 del_type_instance_access = null;
457 del_type_instance_access = del_type;
463 var site_type_decl = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec, new TypeArguments (del_type), loc);
464 var field = site_container.CreateCallSiteField (site_type_decl, loc);
468 if (del_type_instance_access == null) {
469 var dt = d.CurrentType.DeclaringType.MakeGenericType (module, context_mvars.Types);
470 del_type_instance_access = new TypeExpression (MemberCache.GetMember (dt, d.CurrentType), loc);
473 var instanceAccessExprType = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec,
474 new TypeArguments (del_type_instance_access), loc);
476 if (instanceAccessExprType.ResolveAsType (ec.MemberContext) == null)
479 bool inflate_using_mvar = context_mvars != null && ec.IsAnonymousStoreyMutateRequired;
482 if (inflate_using_mvar || context_mvars == null) {
483 gt = site_container.CurrentType;
485 gt = site_container.CurrentType.MakeGenericType (module, context_mvars.Types);
488 // When site container already exists the inflated version has to be
489 // updated manually to contain newly created field
490 if (gt is InflatedTypeSpec && site_container.AnonymousMethodsCounter > 1) {
491 var tparams = gt.MemberDefinition.TypeParametersCount > 0 ? gt.MemberDefinition.TypeParameters : TypeParameterSpec.EmptyTypes;
492 var inflator = new TypeParameterInflator (module, gt, tparams, gt.TypeArguments);
493 gt.MemberCache.AddMember (field.InflateMember (inflator));
496 FieldExpr site_field_expr = new FieldExpr (MemberCache.GetMember (gt, field), loc);
498 BlockContext bc = new BlockContext (ec.MemberContext, null, ec.BuiltinTypes.Void);
500 Arguments args = new Arguments (1);
501 args.Add (new Argument (binder));
502 StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (instanceAccessExprType, "Create"), args)));
504 using (ec.With (BuilderContext.Options.OmitDebugInfo, true)) {
505 if (s.Resolve (bc)) {
506 Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc)), s, loc);
510 args = new Arguments (1 + dyn_args_count);
511 args.Add (new Argument (site_field_expr));
512 if (arguments != null) {
514 foreach (Argument a in arguments) {
515 if (a is NamedArgument) {
516 // Name is not valid in this context
517 args.Add (new Argument (a.Expr, a.ArgType));
522 if (inflate_using_mvar && a.Type != targs[arg_pos].Type)
523 a.Expr.Type = targs[arg_pos].Type;
529 Expression target = new DelegateInvocation (new MemberAccess (site_field_expr, "Target", loc).Resolve (bc), args, false, loc).Resolve (bc);
535 public override void FlowAnalysis (FlowAnalysisContext fc)
537 arguments.FlowAnalysis (fc);
540 public static MemberAccess GetBinderNamespace (Location loc)
542 return new MemberAccess (new MemberAccess (
543 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "Microsoft", loc), "CSharp", loc), "RuntimeBinder", loc);
546 protected MemberAccess GetBinder (string name, Location loc)
548 return new MemberAccess (new TypeExpression (binder_type, loc), name, loc);
553 // Dynamic member access compound assignment for events
555 class DynamicEventCompoundAssign : ExpressionStatement
557 class IsEvent : DynamicExpressionStatement, IDynamicBinder
561 public IsEvent (string name, Arguments args, Location loc)
562 : base (null, args, loc)
568 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
570 type = ec.BuiltinTypes.Bool;
572 Arguments binder_args = new Arguments (3);
574 binder_args.Add (new Argument (new BinderFlags (0, this)));
575 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
576 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
578 return new Invocation (GetBinder ("IsEvent", loc), binder_args);
582 Expression condition;
583 ExpressionStatement invoke, assign;
585 public DynamicEventCompoundAssign (string name, Arguments args, ExpressionStatement assignment, ExpressionStatement invoke, Location loc)
587 condition = new IsEvent (name, args, loc);
588 this.invoke = invoke;
589 this.assign = assignment;
593 public override Expression CreateExpressionTree (ResolveContext ec)
595 return condition.CreateExpressionTree (ec);
598 protected override Expression DoResolve (ResolveContext rc)
600 type = rc.BuiltinTypes.Dynamic;
601 eclass = ExprClass.Value;
602 condition = condition.Resolve (rc);
606 public override void Emit (EmitContext ec)
608 var rc = new ResolveContext (ec.MemberContext);
609 var expr = new Conditional (new BooleanExpression (condition), invoke, assign, loc).Resolve (rc);
613 public override void EmitStatement (EmitContext ec)
615 var stmt = new If (condition, new StatementExpression (invoke), new StatementExpression (assign), loc);
616 using (ec.With (BuilderContext.Options.OmitDebugInfo, true)) {
621 public override void FlowAnalysis (FlowAnalysisContext fc)
623 invoke.FlowAnalysis (fc);
627 class DynamicConversion : DynamicExpressionStatement, IDynamicBinder
629 public DynamicConversion (TypeSpec targetType, CSharpBinderFlags flags, Arguments args, Location loc)
630 : base (null, args, loc)
637 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
639 Arguments binder_args = new Arguments (3);
641 flags |= ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
643 binder_args.Add (new Argument (new BinderFlags (flags, this)));
644 binder_args.Add (new Argument (new TypeOf (type, loc)));
645 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
646 return new Invocation (GetBinder ("Convert", loc), binder_args);
650 class DynamicConstructorBinder : DynamicExpressionStatement, IDynamicBinder
652 public DynamicConstructorBinder (TypeSpec type, Arguments args, Location loc)
653 : base (null, args, loc)
659 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
661 Arguments binder_args = new Arguments (3);
663 binder_args.Add (new Argument (new BinderFlags (0, this)));
664 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
665 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
667 return new Invocation (GetBinder ("InvokeConstructor", loc), binder_args);
671 class DynamicIndexBinder : DynamicMemberAssignable
675 public DynamicIndexBinder (Arguments args, Location loc)
680 public DynamicIndexBinder (CSharpBinderFlags flags, Arguments args, Location loc)
686 protected override Expression DoResolve (ResolveContext ec)
688 can_be_mutator = true;
689 return base.DoResolve (ec);
692 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
694 Arguments binder_args = new Arguments (3);
696 binder_args.Add (new Argument (new BinderFlags (flags, this)));
697 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
698 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
700 isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
701 return new Invocation (GetBinder (isSet ? "SetIndex" : "GetIndex", loc), binder_args);
704 protected override Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
707 // Indexer has arguments which complicates things as the setter and getter
708 // are called in two steps when unary mutator is used. We have to make a
709 // copy of all variable arguments to not duplicate any side effect.
711 // ++d[++arg, Foo ()]
715 return base.CreateSetterArguments (rc, rhs);
717 var setter_args = new Arguments (Arguments.Count + 1);
718 for (int i = 0; i < Arguments.Count; ++i) {
719 var expr = Arguments[i].Expr;
721 if (expr is Constant || expr is VariableReference || expr is This) {
722 setter_args.Add (Arguments [i]);
726 LocalVariable temp = LocalVariable.CreateCompilerGenerated (expr.Type, rc.CurrentBlock, loc);
727 expr = new SimpleAssign (temp.CreateReferenceExpression (rc, expr.Location), expr).Resolve (rc);
728 Arguments[i].Expr = temp.CreateReferenceExpression (rc, expr.Location).Resolve (rc);
729 setter_args.Add (Arguments [i].Clone (expr));
732 setter_args.Add (new Argument (rhs));
737 class DynamicInvocation : DynamicExpressionStatement, IDynamicBinder
739 readonly ATypeNameExpression member;
741 public DynamicInvocation (ATypeNameExpression member, Arguments args, Location loc)
742 : base (null, args, loc)
745 this.member = member;
748 public static DynamicInvocation CreateSpecialNameInvoke (ATypeNameExpression member, Arguments args, Location loc)
750 return new DynamicInvocation (member, args, loc) {
751 flags = CSharpBinderFlags.InvokeSpecialName
755 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
757 Arguments binder_args = new Arguments (member != null ? 5 : 3);
758 bool is_member_access = member is MemberAccess;
760 CSharpBinderFlags call_flags;
761 if (!is_member_access && member is SimpleName) {
762 call_flags = CSharpBinderFlags.InvokeSimpleName;
763 is_member_access = true;
768 binder_args.Add (new Argument (new BinderFlags (call_flags, this)));
770 if (is_member_access)
771 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, member.Name, member.Location)));
773 if (member != null && member.HasTypeArguments) {
774 TypeArguments ta = member.TypeArguments;
775 if (ta.Resolve (ec, false)) {
776 var targs = new ArrayInitializer (ta.Count, loc);
777 foreach (TypeSpec t in ta.Arguments)
778 targs.Add (new TypeOf (t, loc));
780 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (targs, loc)));
782 } else if (is_member_access) {
783 binder_args.Add (new Argument (new NullLiteral (loc)));
786 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
788 Expression real_args;
790 // Cannot be null because .NET trips over
791 real_args = new ArrayCreation (
792 new MemberAccess (GetBinderNamespace (loc), "CSharpArgumentInfo", loc),
793 new ArrayInitializer (0, loc), loc);
795 real_args = new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc);
798 binder_args.Add (new Argument (real_args));
800 return new Invocation (GetBinder (is_member_access ? "InvokeMember" : "Invoke", loc), binder_args);
803 public override void EmitStatement (EmitContext ec)
805 flags |= CSharpBinderFlags.ResultDiscarded;
806 base.EmitStatement (ec);
810 class DynamicMemberBinder : DynamicMemberAssignable
812 readonly string name;
814 public DynamicMemberBinder (string name, Arguments args, Location loc)
820 public DynamicMemberBinder (string name, CSharpBinderFlags flags, Arguments args, Location loc)
821 : this (name, args, loc)
826 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
828 Arguments binder_args = new Arguments (4);
830 binder_args.Add (new Argument (new BinderFlags (flags, this)));
831 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
832 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
833 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
835 isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
836 return new Invocation (GetBinder (isSet ? "SetMember" : "GetMember", loc), binder_args);
841 // Any member binder which can be source and target of assignment
843 abstract class DynamicMemberAssignable : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
846 Arguments setter_args;
848 protected DynamicMemberAssignable (Arguments args, Location loc)
849 : base (null, args, loc)
854 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
857 // DoResolve always uses getter
859 return CreateCallSiteBinder (ec, args, false);
862 protected abstract Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet);
864 protected virtual Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
866 var setter_args = new Arguments (Arguments.Count + 1);
867 setter_args.AddRange (Arguments);
868 setter_args.Add (new Argument (rhs));
872 public override Expression DoResolveLValue (ResolveContext rc, Expression right_side)
874 if (right_side == EmptyExpression.OutAccess) {
875 right_side.DoResolveLValue (rc, this);
879 if (DoResolveCore (rc)) {
880 setter_args = CreateSetterArguments (rc, right_side);
881 setter = CreateCallSiteBinder (rc, setter_args, true);
884 eclass = ExprClass.Variable;
888 public override void Emit (EmitContext ec)
890 // It's null for ResolveLValue used without assignment
891 if (binder_expr == null)
892 EmitCall (ec, setter, Arguments, false);
897 public override void EmitStatement (EmitContext ec)
899 // It's null for ResolveLValue used without assignment
900 if (binder_expr == null)
901 EmitCall (ec, setter, Arguments, true);
903 base.EmitStatement (ec);
906 #region IAssignMethod Members
908 public void Emit (EmitContext ec, bool leave_copy)
910 throw new NotImplementedException ();
913 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
915 EmitCall (ec, setter, setter_args, !leave_copy);
921 class DynamicUnaryConversion : DynamicExpressionStatement, IDynamicBinder
923 readonly string name;
925 public DynamicUnaryConversion (string name, Arguments args, Location loc)
926 : base (null, args, loc)
932 public static DynamicUnaryConversion CreateIsTrue (ResolveContext rc, Arguments args, Location loc)
934 return new DynamicUnaryConversion ("IsTrue", args, loc) { type = rc.BuiltinTypes.Bool };
937 public static DynamicUnaryConversion CreateIsFalse (ResolveContext rc, Arguments args, Location loc)
939 return new DynamicUnaryConversion ("IsFalse", args, loc) { type = rc.BuiltinTypes.Bool };
942 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
944 Arguments binder_args = new Arguments (4);
946 MemberAccess sle = new MemberAccess (new MemberAccess (
947 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
949 var flags = ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
951 binder_args.Add (new Argument (new BinderFlags (flags, this)));
952 binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), name, loc)));
953 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
954 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
956 return new Invocation (GetBinder ("UnaryOperation", loc), binder_args);
960 sealed class DynamicSiteClass : HoistedStoreyClass
962 public DynamicSiteClass (TypeDefinition parent, MemberBase host, TypeParameters tparams)
963 : base (parent, MakeMemberName (host, "DynamicSite", parent.DynamicSitesCounter, tparams, Location.Null), tparams, Modifiers.STATIC, MemberKind.Class)
965 parent.DynamicSitesCounter++;
968 public FieldSpec CreateCallSiteField (FullNamedExpression type, Location loc)
970 int index = AnonymousMethodsCounter++;
971 Field f = new HoistedField (this, type, Modifiers.PUBLIC | Modifiers.STATIC, "Site" + index.ToString ("X"), null, loc);