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;
23 // A copy of Microsoft.CSharp/Microsoft.CSharp.RuntimeBinder/CSharpBinderFlags.cs
24 // has to be kept in sync
27 public enum CSharpBinderFlags
31 InvokeSimpleName = 1 << 1,
32 InvokeSpecialName = 1 << 2,
33 BinaryOperationLogical = 1 << 3,
34 ConvertExplicit = 1 << 4,
35 ConvertArrayIndex = 1 << 5,
36 ResultIndexed = 1 << 6,
37 ValueFromCompoundAssignment = 1 << 7,
38 ResultDiscarded = 1 << 8
42 // Type expression with internal dynamic type symbol
44 class DynamicTypeExpr : TypeExpr
46 public DynamicTypeExpr (Location loc)
51 public override TypeSpec ResolveAsType (IMemberContext ec)
53 eclass = ExprClass.Type;
54 type = ec.Module.Compiler.BuiltinTypes.Dynamic;
59 #region Dynamic runtime binder expressions
62 // Expression created from runtime dynamic object value by dynamic binder
64 public class RuntimeValueExpression : Expression, IDynamicAssign, IMemoryLocation
67 public class DynamicMetaObject
69 public TypeSpec RuntimeType;
70 public TypeSpec LimitType;
71 public SLE.Expression Expression;
75 readonly DynamicMetaObject obj;
77 public RuntimeValueExpression (DynamicMetaObject obj, TypeSpec type)
81 this.eclass = ExprClass.Variable;
86 public bool IsSuggestionOnly { get; set; }
88 public DynamicMetaObject MetaObject {
94 public void AddressOf (EmitContext ec, AddressOp mode)
96 throw new NotImplementedException ();
99 public override bool ContainsEmitWithAwait ()
101 throw new NotSupportedException ();
104 public override Expression CreateExpressionTree (ResolveContext ec)
106 throw new NotSupportedException ();
109 protected override Expression DoResolve (ResolveContext ec)
114 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
119 public override void Emit (EmitContext ec)
121 throw new NotImplementedException ();
124 #region IAssignMethod Members
126 public void Emit (EmitContext ec, bool leave_copy)
128 throw new NotImplementedException ();
131 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
133 throw new NotImplementedException ();
138 public SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source)
140 return obj.Expression;
143 public override SLE.Expression MakeExpression (BuilderContext ctx)
146 return base.MakeExpression (ctx);
150 if (type.IsStruct && !obj.Expression.Type.IsValueType)
151 return SLE.Expression.Unbox (obj.Expression, type.GetMetaInfo ());
153 if (obj.Expression.NodeType == SLE.ExpressionType.Parameter) {
154 if (((SLE.ParameterExpression) obj.Expression).IsByRef)
155 return obj.Expression;
159 return SLE.Expression.Convert (obj.Expression, type.GetMetaInfo ());
165 // Wraps runtime dynamic expression into expected type. Needed
166 // to satify expected type check by dynamic binder and no conversion
167 // is required (ResultDiscarded).
169 public class DynamicResultCast : ShimExpression
171 public DynamicResultCast (TypeSpec type, Expression expr)
177 protected override Expression DoResolve (ResolveContext ec)
179 expr = expr.Resolve (ec);
180 eclass = ExprClass.Value;
185 public override SLE.Expression MakeExpression (BuilderContext ctx)
188 return base.MakeExpression (ctx);
190 return SLE.Expression.Block (expr.MakeExpression (ctx), SLE.Expression.Default (type.GetMetaInfo ()));
199 // Creates dynamic binder expression
201 interface IDynamicBinder
203 Expression CreateCallSiteBinder (ResolveContext ec, Arguments args);
207 // Extends standard assignment interface for expressions
208 // supported by dynamic resolver
210 interface IDynamicAssign : IAssignMethod
212 SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source);
216 // Base dynamic expression statement creator
218 class DynamicExpressionStatement : ExpressionStatement
221 // Binder flag dynamic constant, the value is combination of
222 // flags known at resolve stage and flags known only at emit
225 protected class BinderFlags : EnumConstant
227 DynamicExpressionStatement statement;
228 CSharpBinderFlags flags;
230 public BinderFlags (CSharpBinderFlags flags, DynamicExpressionStatement statement)
231 : base (statement.loc)
234 this.statement = statement;
238 protected override Expression DoResolve (ResolveContext ec)
240 Child = new IntConstant (ec.BuiltinTypes, (int) (flags | statement.flags), statement.loc);
242 type = ec.Module.PredefinedTypes.BinderFlags.Resolve ();
243 eclass = Child.eclass;
248 readonly Arguments arguments;
249 protected IDynamicBinder binder;
250 protected Expression binder_expr;
252 // Used by BinderFlags
253 protected CSharpBinderFlags flags;
255 TypeSpec binder_type;
256 TypeParameter[] context_mvars;
258 public DynamicExpressionStatement (IDynamicBinder binder, Arguments args, Location loc)
260 this.binder = binder;
261 this.arguments = args;
265 public Arguments Arguments {
271 public override bool ContainsEmitWithAwait ()
273 return arguments.ContainsEmitWithAwait ();
276 public override Expression CreateExpressionTree (ResolveContext ec)
278 ec.Report.Error (1963, loc, "An expression tree cannot contain a dynamic operation");
282 protected override Expression DoResolve (ResolveContext rc)
284 if (DoResolveCore (rc))
285 binder_expr = binder.CreateCallSiteBinder (rc, arguments);
290 protected bool DoResolveCore (ResolveContext rc)
292 if (rc.CurrentTypeParameters != null && rc.CurrentTypeParameters[0].IsMethodTypeParameter)
293 context_mvars = rc.CurrentTypeParameters;
295 int errors = rc.Report.Errors;
296 var pt = rc.Module.PredefinedTypes;
298 binder_type = pt.Binder.Resolve ();
299 pt.CallSite.Resolve ();
300 pt.CallSiteGeneric.Resolve ();
302 eclass = ExprClass.Value;
305 type = rc.BuiltinTypes.Dynamic;
307 if (rc.Report.Errors == errors)
310 rc.Report.Error (1969, loc,
311 "Dynamic operation cannot be compiled without `Microsoft.CSharp.dll' assembly reference");
315 public override void Emit (EmitContext ec)
317 EmitCall (ec, binder_expr, arguments, false);
320 public override void EmitStatement (EmitContext ec)
322 EmitCall (ec, binder_expr, arguments, true);
325 protected void EmitCall (EmitContext ec, Expression binder, Arguments arguments, bool isStatement)
328 // This method generates all internal infrastructure for a dynamic call. The
329 // reason why it's quite complicated is the mixture of dynamic and anonymous
330 // methods. Dynamic itself requires a temporary class (ContainerX) and anonymous
331 // methods can generate temporary storey as well (AnonStorey). Handling MVAR
332 // type parameters rewrite is non-trivial in such case as there are various
333 // combinations possible therefore the mutator is not straightforward. Secondly
334 // we need to keep both MVAR(possibly VAR for anon storey) and type VAR to emit
335 // correct Site field type and its access from EmitContext.
338 int dyn_args_count = arguments == null ? 0 : arguments.Count;
339 int default_args = isStatement ? 1 : 2;
340 var module = ec.Module;
342 bool has_ref_out_argument = false;
343 var targs = new TypeExpression[dyn_args_count + default_args];
344 targs[0] = new TypeExpression (module.PredefinedTypes.CallSite.TypeSpec, loc);
346 TypeExpression[] targs_for_instance = null;
347 TypeParameterMutator mutator;
349 var site_container = ec.CreateDynamicSite ();
351 if (context_mvars != null) {
352 TypeParameter[] tparam;
353 TypeContainer sc = site_container;
355 tparam = sc.CurrentTypeParameters;
357 } while (tparam == null);
359 mutator = new TypeParameterMutator (context_mvars, tparam);
361 if (!ec.IsAnonymousStoreyMutateRequired) {
362 targs_for_instance = new TypeExpression[targs.Length];
363 targs_for_instance[0] = targs[0];
369 for (int i = 0; i < dyn_args_count; ++i) {
370 Argument a = arguments[i];
371 if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
372 has_ref_out_argument = true;
376 // Convert any internal type like dynamic or null to object
377 if (t.Kind == MemberKind.InternalCompilerType)
378 t = ec.BuiltinTypes.Object;
380 if (targs_for_instance != null)
381 targs_for_instance[i + 1] = new TypeExpression (t, loc);
384 t = t.Mutate (mutator);
386 targs[i + 1] = new TypeExpression (t, loc);
389 TypeExpr del_type = null;
390 TypeExpr del_type_instance_access = null;
391 if (!has_ref_out_argument) {
392 string d_name = isStatement ? "Action" : "Func";
395 Namespace type_ns = module.GlobalRootNamespace.GetNamespace ("System", true);
396 if (type_ns != null) {
397 te = type_ns.LookupType (module, d_name, dyn_args_count + default_args, LookupMode.Normal, loc);
403 if (t.Kind == MemberKind.InternalCompilerType)
404 t = ec.BuiltinTypes.Object;
406 if (targs_for_instance != null)
407 targs_for_instance[targs_for_instance.Length - 1] = new TypeExpression (t, loc);
410 t = t.Mutate (mutator);
412 targs[targs.Length - 1] = new TypeExpression (t, loc);
415 del_type = new GenericTypeExpr (te.Type, new TypeArguments (targs), loc);
416 if (targs_for_instance != null)
417 del_type_instance_access = new GenericTypeExpr (te.Type, new TypeArguments (targs_for_instance), loc);
419 del_type_instance_access = del_type;
424 // Create custom delegate when no appropriate predefined delegate has been found
427 if (del_type == null) {
428 TypeSpec rt = isStatement ? ec.BuiltinTypes.Void : type;
429 Parameter[] p = new Parameter[dyn_args_count + 1];
430 p[0] = new Parameter (targs[0], "p0", Parameter.Modifier.NONE, null, loc);
432 var site = ec.CreateDynamicSite ();
433 int index = site.Types == null ? 0 : site.Types.Count;
436 rt = mutator.Mutate (rt);
438 for (int i = 1; i < dyn_args_count + 1; ++i) {
439 p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
442 d = new Delegate (site.NamespaceEntry, site, new TypeExpression (rt, loc),
443 Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
444 new MemberName ("Container" + index.ToString ("X")),
445 new ParametersCompiled (p), null);
452 site.AddDelegate (d);
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.Select (l => l.Type).ToArray ());
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.Select (l => l.Type).ToArray ());
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.Fields.Count > 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);
499 SymbolWriter.OpenCompilerGeneratedBlock (ec);
501 Arguments args = new Arguments (1);
502 args.Add (new Argument (binder));
503 StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (instanceAccessExprType, "Create"), args)));
505 if (s.Resolve (bc)) {
506 Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc), 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, loc).Resolve (bc);
533 SymbolWriter.CloseCompilerGeneratedBlock (ec);
536 public static MemberAccess GetBinderNamespace (Location loc)
538 return new MemberAccess (new MemberAccess (
539 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "Microsoft", loc), "CSharp", loc), "RuntimeBinder", loc);
542 protected MemberAccess GetBinder (string name, Location loc)
544 return new MemberAccess (new TypeExpression (binder_type, loc), name, loc);
549 // Dynamic member access compound assignment for events
551 class DynamicEventCompoundAssign : ExpressionStatement
553 class IsEvent : DynamicExpressionStatement, IDynamicBinder
557 public IsEvent (string name, Arguments args, Location loc)
558 : base (null, args, loc)
564 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
566 type = ec.BuiltinTypes.Bool;
568 Arguments binder_args = new Arguments (3);
570 binder_args.Add (new Argument (new BinderFlags (0, this)));
571 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
572 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
574 return new Invocation (GetBinder ("IsEvent", loc), binder_args);
578 Expression condition;
579 ExpressionStatement invoke, assign;
581 public DynamicEventCompoundAssign (string name, Arguments args, ExpressionStatement assignment, ExpressionStatement invoke, Location loc)
583 condition = new IsEvent (name, args, loc);
584 this.invoke = invoke;
585 this.assign = assignment;
589 public override Expression CreateExpressionTree (ResolveContext ec)
591 return condition.CreateExpressionTree (ec);
594 protected override Expression DoResolve (ResolveContext rc)
596 type = rc.BuiltinTypes.Dynamic;
597 eclass = ExprClass.Value;
598 condition = condition.Resolve (rc);
602 public override void Emit (EmitContext ec)
604 var rc = new ResolveContext (ec.MemberContext);
605 var expr = new Conditional (new BooleanExpression (condition), invoke, assign, loc).Resolve (rc);
609 public override void EmitStatement (EmitContext ec)
611 var stmt = new If (condition, new StatementExpression (invoke), new StatementExpression (assign), loc);
616 class DynamicConversion : DynamicExpressionStatement, IDynamicBinder
618 public DynamicConversion (TypeSpec targetType, CSharpBinderFlags flags, Arguments args, Location loc)
619 : base (null, args, loc)
626 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
628 Arguments binder_args = new Arguments (3);
630 flags |= ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
632 binder_args.Add (new Argument (new BinderFlags (flags, this)));
633 binder_args.Add (new Argument (new TypeOf (type, loc)));
634 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
635 return new Invocation (GetBinder ("Convert", loc), binder_args);
639 class DynamicConstructorBinder : DynamicExpressionStatement, IDynamicBinder
641 public DynamicConstructorBinder (TypeSpec type, Arguments args, Location loc)
642 : base (null, args, loc)
648 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
650 Arguments binder_args = new Arguments (3);
652 binder_args.Add (new Argument (new BinderFlags (0, this)));
653 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
654 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
656 return new Invocation (GetBinder ("InvokeConstructor", loc), binder_args);
660 class DynamicIndexBinder : DynamicMemberAssignable
664 public DynamicIndexBinder (Arguments args, Location loc)
669 public DynamicIndexBinder (CSharpBinderFlags flags, Arguments args, Location loc)
675 protected override Expression DoResolve (ResolveContext ec)
677 can_be_mutator = true;
678 return base.DoResolve (ec);
681 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
683 Arguments binder_args = new Arguments (3);
685 binder_args.Add (new Argument (new BinderFlags (flags, this)));
686 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
687 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
689 isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
690 return new Invocation (GetBinder (isSet ? "SetIndex" : "GetIndex", loc), binder_args);
693 protected override Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
696 // Indexer has arguments which complicates things as the setter and getter
697 // are called in two steps when unary mutator is used. We have to make a
698 // copy of all variable arguments to not duplicate any side effect.
700 // ++d[++arg, Foo ()]
704 return base.CreateSetterArguments (rc, rhs);
706 var setter_args = new Arguments (Arguments.Count + 1);
707 for (int i = 0; i < Arguments.Count; ++i) {
708 var expr = Arguments[i].Expr;
710 if (expr is Constant || expr is VariableReference || expr is This) {
711 setter_args.Add (Arguments [i]);
715 LocalVariable temp = LocalVariable.CreateCompilerGenerated (expr.Type, rc.CurrentBlock, loc);
716 expr = new SimpleAssign (temp.CreateReferenceExpression (rc, expr.Location), expr).Resolve (rc);
717 Arguments[i].Expr = temp.CreateReferenceExpression (rc, expr.Location).Resolve (rc);
718 setter_args.Add (Arguments [i].Clone (expr));
721 setter_args.Add (new Argument (rhs));
726 class DynamicInvocation : DynamicExpressionStatement, IDynamicBinder
728 readonly ATypeNameExpression member;
730 public DynamicInvocation (ATypeNameExpression member, Arguments args, Location loc)
731 : base (null, args, loc)
734 this.member = member;
738 // When a return type is known not to be dynamic
740 public DynamicInvocation (ATypeNameExpression member, Arguments args, TypeSpec type, Location loc)
741 : this (member, args, loc)
746 public static DynamicInvocation CreateSpecialNameInvoke (ATypeNameExpression member, Arguments args, Location loc)
748 return new DynamicInvocation (member, args, loc) {
749 flags = CSharpBinderFlags.InvokeSpecialName
753 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
755 Arguments binder_args = new Arguments (member != null ? 5 : 3);
756 bool is_member_access = member is MemberAccess;
758 CSharpBinderFlags call_flags;
759 if (!is_member_access && member is SimpleName) {
760 call_flags = CSharpBinderFlags.InvokeSimpleName;
761 is_member_access = true;
766 binder_args.Add (new Argument (new BinderFlags (call_flags, this)));
768 if (is_member_access)
769 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, member.Name, member.Location)));
771 if (member != null && member.HasTypeArguments) {
772 TypeArguments ta = member.TypeArguments;
773 if (ta.Resolve (ec)) {
774 var targs = new ArrayInitializer (ta.Count, loc);
775 foreach (TypeSpec t in ta.Arguments)
776 targs.Add (new TypeOf (t, loc));
778 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (targs, loc)));
780 } else if (is_member_access) {
781 binder_args.Add (new Argument (new NullLiteral (loc)));
784 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
786 Expression real_args;
788 // Cannot be null because .NET trips over
789 real_args = new ArrayCreation (
790 new MemberAccess (GetBinderNamespace (loc), "CSharpArgumentInfo", loc),
791 new ArrayInitializer (0, loc), loc);
793 real_args = new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc);
796 binder_args.Add (new Argument (real_args));
798 return new Invocation (GetBinder (is_member_access ? "InvokeMember" : "Invoke", loc), binder_args);
801 public override void EmitStatement (EmitContext ec)
803 flags |= CSharpBinderFlags.ResultDiscarded;
804 base.EmitStatement (ec);
808 class DynamicMemberBinder : DynamicMemberAssignable
810 readonly string name;
812 public DynamicMemberBinder (string name, Arguments args, Location loc)
818 public DynamicMemberBinder (string name, CSharpBinderFlags flags, Arguments args, Location loc)
819 : this (name, args, loc)
824 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
826 Arguments binder_args = new Arguments (4);
828 binder_args.Add (new Argument (new BinderFlags (flags, this)));
829 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
830 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
831 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
833 isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
834 return new Invocation (GetBinder (isSet ? "SetMember" : "GetMember", loc), binder_args);
839 // Any member binder which can be source and target of assignment
841 abstract class DynamicMemberAssignable : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
844 Arguments setter_args;
846 protected DynamicMemberAssignable (Arguments args, Location loc)
847 : base (null, args, loc)
852 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
855 // DoResolve always uses getter
857 return CreateCallSiteBinder (ec, args, false);
860 protected abstract Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet);
862 protected virtual Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
864 var setter_args = new Arguments (Arguments.Count + 1);
865 setter_args.AddRange (Arguments);
866 setter_args.Add (new Argument (rhs));
870 public override Expression DoResolveLValue (ResolveContext rc, Expression right_side)
872 if (right_side == EmptyExpression.OutAccess) {
873 right_side.DoResolveLValue (rc, this);
877 if (DoResolveCore (rc)) {
878 setter_args = CreateSetterArguments (rc, right_side);
879 setter = CreateCallSiteBinder (rc, setter_args, true);
882 eclass = ExprClass.Variable;
886 public override void Emit (EmitContext ec)
888 // It's null for ResolveLValue used without assignment
889 if (binder_expr == null)
890 EmitCall (ec, setter, Arguments, false);
895 public override void EmitStatement (EmitContext ec)
897 // It's null for ResolveLValue used without assignment
898 if (binder_expr == null)
899 EmitCall (ec, setter, Arguments, true);
901 base.EmitStatement (ec);
904 #region IAssignMethod Members
906 public void Emit (EmitContext ec, bool leave_copy)
908 throw new NotImplementedException ();
911 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool isCompound)
913 EmitCall (ec, setter, setter_args, !leave_copy);
919 class DynamicUnaryConversion : DynamicExpressionStatement, IDynamicBinder
921 readonly string name;
923 public DynamicUnaryConversion (string name, Arguments args, Location loc)
924 : base (null, args, loc)
930 public static DynamicUnaryConversion CreateIsTrue (ResolveContext rc, Arguments args, Location loc)
932 return new DynamicUnaryConversion ("IsTrue", args, loc) { type = rc.BuiltinTypes.Bool };
935 public static DynamicUnaryConversion CreateIsFalse (ResolveContext rc, Arguments args, Location loc)
937 return new DynamicUnaryConversion ("IsFalse", args, loc) { type = rc.BuiltinTypes.Bool };
940 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
942 Arguments binder_args = new Arguments (4);
944 MemberAccess sle = new MemberAccess (new MemberAccess (
945 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
947 var flags = ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
949 binder_args.Add (new Argument (new BinderFlags (flags, this)));
950 binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), name, loc)));
951 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
952 binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
954 return new Invocation (GetBinder ("UnaryOperation", loc), binder_args);
958 sealed class DynamicSiteClass : HoistedStoreyClass
960 public DynamicSiteClass (TypeContainer parent, MemberBase host, TypeParameter[] tparams)
961 : base (parent, MakeMemberName (host, "DynamicSite", parent.DynamicSitesCounter, tparams, Location.Null), tparams, Modifiers.STATIC)
963 parent.DynamicSitesCounter++;
966 public FieldSpec CreateCallSiteField (FullNamedExpression type, Location loc)
968 int index = fields == null ? 0 : fields.Count;
969 Field f = new HoistedField (this, type, Modifiers.PUBLIC | Modifiers.STATIC, "Site" + index.ToString ("X"), null, loc);