mcs/mcs/dynamic.cs

   1 //
   2 // dynamic.cs: support for dynamic expressions
   3 //
   4 // Authors: Marek Safar (marek.safar@gmail.com)
   5 //
   6 // Dual licensed under the terms of the MIT X11 or GNU GPL
   7 //
   8 // Copyright 2009 Novell, Inc
   9 //
  10
  11 using System;
  12 using System.Linq;
  13 using SLE = System.Linq.Expressions;
  14
  15 #if NET_4_0
  16 using System.Dynamic;
  17 #endif
  18
  19 namespace Mono.CSharp
  20 {
  21         //
  22         // A copy of Microsoft.CSharp/Microsoft.CSharp.RuntimeBinder/CSharpBinderFlags.cs
  23         // has to be kept in sync
  24         //
  25         [Flags]
  26         public enum CSharpBinderFlags
  27         {
  28                 None = 0,
  29                 CheckedContext = 1,
  30                 InvokeSimpleName = 1 << 1,
  31                 InvokeSpecialName = 1 << 2,
  32                 BinaryOperationLogical = 1 << 3,
  33                 ConvertExplicit = 1 << 4,
  34                 ConvertArrayIndex = 1 << 5,
  35                 ResultIndexed = 1 << 6,
  36                 ValueFromCompoundAssignment = 1 << 7,
  37                 ResultDiscarded = 1 << 8
  38         }
  39
  40         //
  41         // Type expression with internal dynamic type symbol
  42         //
  43         class DynamicTypeExpr : TypeExpr
  44         {
  45                 public DynamicTypeExpr (Location loc)
  46                 {
  47                         this.loc = loc;
  48                 }
  49
  50                 public override TypeSpec ResolveAsType (IMemberContext ec)
  51                 {
  52                         eclass = ExprClass.Type;
  53                         type = ec.Module.Compiler.BuiltinTypes.Dynamic;
  54                         return type;
  55                 }
  56         }
  57
  58         #region Dynamic runtime binder expressions
  59
  60         //
  61         // Expression created from runtime dynamic object value by dynamic binder
  62         //
  63         public class RuntimeValueExpression : Expression, IDynamicAssign, IMemoryLocation
  64         {
  65 #if !NET_4_0
  66                 public class DynamicMetaObject
  67                 {
  68                         public TypeSpec RuntimeType;
  69                         public TypeSpec LimitType;
  70                         public SLE.Expression Expression;
  71                 }
  72 #endif
  73
  74                 readonly DynamicMetaObject obj;
  75
  76                 public RuntimeValueExpression (DynamicMetaObject obj, TypeSpec type)
  77                 {
  78                         this.obj = obj;
  79                         this.type = type;
  80                         this.eclass = ExprClass.Variable;
  81                 }
  82
  83                 #region Properties
  84
  85                 public bool IsSuggestionOnly { get; set; }
  86
  87                 public DynamicMetaObject MetaObject {
  88                         get { return obj; }
  89                 }
  90
  91                 #endregion
  92
  93                 public void AddressOf (EmitContext ec, AddressOp mode)
  94                 {
  95                         throw new NotImplementedException ();
  96                 }
  97
  98                 public override Expression CreateExpressionTree (ResolveContext ec)
  99                 {
 100                         throw new NotImplementedException ();
 101                 }
 102
 103                 protected override Expression DoResolve (ResolveContext ec)
 104                 {
 105                         return this;
 106                 }
 107
 108                 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
 109                 {
 110                         return this;
 111                 }
 112
 113                 public override void Emit (EmitContext ec)
 114                 {
 115                         throw new NotImplementedException ();
 116                 }
 117
 118                 #region IAssignMethod Members
 119
 120                 public void Emit (EmitContext ec, bool leave_copy)
 121                 {
 122                         throw new NotImplementedException ();
 123                 }
 124
 125                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
 126                 {
 127                         throw new NotImplementedException ();
 128                 }
 129
 130                 #endregion
 131
 132                 public SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source)
 133                 {
 134                         return obj.Expression;
 135                 }
 136
 137                 public override SLE.Expression MakeExpression (BuilderContext ctx)
 138                 {
 139 #if STATIC
 140                         return base.MakeExpression (ctx);
 141 #else
 142
 143         #if NET_4_0
 144                                 if (type.IsStruct && !obj.Expression.Type.IsValueType)
 145                                         return SLE.Expression.Unbox (obj.Expression, type.GetMetaInfo ());
 146
 147                                 if (obj.Expression.NodeType == SLE.ExpressionType.Parameter) {
 148                                         if (((SLE.ParameterExpression) obj.Expression).IsByRef)
 149                                                 return obj.Expression;
 150                                 }
 151         #endif
 152
 153                                 return SLE.Expression.Convert (obj.Expression, type.GetMetaInfo ());
 154 #endif
 155                 }
 156         }
 157
 158         //
 159         // Wraps runtime dynamic expression into expected type. Needed
 160         // to satify expected type check by dynamic binder and no conversion
 161         // is required (ResultDiscarded).
 162         //
 163         public class DynamicResultCast : ShimExpression
 164         {
 165                 public DynamicResultCast (TypeSpec type, Expression expr)
 166                         : base (expr)
 167                 {
 168                         this.type = type;
 169                 }
 170
 171                 protected override Expression DoResolve (ResolveContext ec)
 172                 {
 173                         expr = expr.Resolve (ec);
 174                         eclass = ExprClass.Value;
 175                         return this;
 176                 }
 177
 178 #if NET_4_0
 179                 public override SLE.Expression MakeExpression (BuilderContext ctx)
 180                 {
 181 #if STATIC
 182                         return base.MakeExpression (ctx);
 183 #else
 184                         return SLE.Expression.Block (expr.MakeExpression (ctx), SLE.Expression.Default (type.GetMetaInfo ()));
 185 #endif
 186                 }
 187 #endif
 188         }
 189
 190         #endregion
 191
 192         //
 193         // Creates dynamic binder expression
 194         //
 195         interface IDynamicBinder
 196         {
 197                 Expression CreateCallSiteBinder (ResolveContext ec, Arguments args);
 198         }
 199
 200         //
 201         // Extends standard assignment interface for expressions
 202         // supported by dynamic resolver
 203         //
 204         interface IDynamicAssign : IAssignMethod
 205         {
 206                 SLE.Expression MakeAssignExpression (BuilderContext ctx, Expression source);
 207         }
 208
 209         //
 210         // Base dynamic expression statement creator
 211         //
 212         class DynamicExpressionStatement : ExpressionStatement
 213         {
 214                 //
 215                 // Binder flag dynamic constant, the value is combination of
 216                 // flags known at resolve stage and flags known only at emit
 217                 // stage
 218                 //
 219                 protected class BinderFlags : EnumConstant
 220                 {
 221                         DynamicExpressionStatement statement;
 222                         CSharpBinderFlags flags;
 223
 224                         public BinderFlags (CSharpBinderFlags flags, DynamicExpressionStatement statement)
 225                                 : base (statement.loc)
 226                         {
 227                                 this.flags = flags;
 228                                 this.statement = statement;
 229                                 eclass = 0;
 230                         }
 231
 232                         protected override Expression DoResolve (ResolveContext ec)
 233                         {
 234                                 Child = new IntConstant (ec.BuiltinTypes, (int) (flags | statement.flags), statement.loc);
 235
 236                                 type = ec.Module.PredefinedTypes.BinderFlags.Resolve ();
 237                                 eclass = Child.eclass;
 238                                 return this;
 239                         }
 240                 }
 241
 242                 readonly Arguments arguments;
 243                 protected IDynamicBinder binder;
 244                 protected Expression binder_expr;
 245
 246                 // Used by BinderFlags
 247                 protected CSharpBinderFlags flags;
 248
 249                 TypeSpec binder_type;
 250                 TypeParameter[] context_mvars;
 251
 252                 public DynamicExpressionStatement (IDynamicBinder binder, Arguments args, Location loc)
 253                 {
 254                         this.binder = binder;
 255                         this.arguments = args;
 256                         this.loc = loc;
 257                 }
 258
 259                 public Arguments Arguments {
 260                         get {
 261                                 return arguments;
 262                         }
 263                 }
 264
 265                 public override Expression CreateExpressionTree (ResolveContext ec)
 266                 {
 267                         ec.Report.Error (1963, loc, "An expression tree cannot contain a dynamic operation");
 268                         return null;
 269                 }
 270
 271                 protected override Expression DoResolve (ResolveContext rc)
 272                 {
 273                         if (DoResolveCore (rc))
 274                                 binder_expr = binder.CreateCallSiteBinder (rc, arguments);
 275
 276                         return this;
 277                 }
 278
 279                 protected bool DoResolveCore (ResolveContext rc)
 280                 {
 281                         if (rc.CurrentTypeParameters != null && rc.CurrentTypeParameters[0].IsMethodTypeParameter)
 282                                 context_mvars = rc.CurrentTypeParameters;
 283
 284                         int errors = rc.Report.Errors;
 285                         var pt = rc.Module.PredefinedTypes;
 286
 287                         binder_type = pt.Binder.Resolve ();
 288                         pt.CallSite.Resolve ();
 289                         pt.CallSiteGeneric.Resolve ();
 290
 291                         eclass = ExprClass.Value;
 292
 293                         if (type == null)
 294                                 type = rc.BuiltinTypes.Dynamic;
 295
 296                         if (rc.Report.Errors == errors)
 297                                 return true;
 298
 299                         rc.Report.Error (1969, loc,
 300                                 "Dynamic operation cannot be compiled without `Microsoft.CSharp.dll' assembly reference");
 301                         return false;
 302                 }
 303
 304                 public override void Emit (EmitContext ec)
 305                 {
 306                         EmitCall (ec, binder_expr, arguments,  false);
 307                 }
 308
 309                 public override void EmitStatement (EmitContext ec)
 310                 {
 311                         EmitCall (ec, binder_expr, arguments, true);
 312                 }
 313
 314                 protected void EmitCall (EmitContext ec, Expression binder, Arguments arguments, bool isStatement)
 315                 {
 316                         //
 317                         // This method generates all internal infrastructure for a dynamic call. The
 318                         // reason why it's quite complicated is the mixture of dynamic and anonymous
 319                         // methods. Dynamic itself requires a temporary class (ContainerX) and anonymous
 320                         // methods can generate temporary storey as well (AnonStorey). Handling MVAR
 321                         // type parameters rewrite is non-trivial in such case as there are various
 322                         // combinations possible therefore the mutator is not straightforward. Secondly
 323                         // we need to keep both MVAR(possibly VAR for anon storey) and type VAR to emit
 324                         // correct Site field type and its access from EmitContext.
 325                         //
 326
 327                         int dyn_args_count = arguments == null ? 0 : arguments.Count;
 328                         int default_args = isStatement ? 1 : 2;
 329                         var module = ec.Module;
 330
 331                         bool has_ref_out_argument = false;
 332                         var targs = new TypeExpression[dyn_args_count + default_args];
 333                         targs[0] = new TypeExpression (module.PredefinedTypes.CallSite.TypeSpec, loc);
 334
 335                         TypeExpression[] targs_for_instance = null;
 336                         TypeParameterMutator mutator;
 337
 338                         var site_container = ec.CreateDynamicSite ();
 339
 340                         if (context_mvars != null) {
 341                                 TypeParameter[] tparam;
 342                                 TypeContainer sc = site_container;
 343                                 do {
 344                                         tparam = sc.CurrentTypeParameters;
 345                                         sc = sc.Parent;
 346                                 } while (tparam == null);
 347
 348                                 mutator = new TypeParameterMutator (context_mvars, tparam);
 349
 350                                 if (!ec.IsAnonymousStoreyMutateRequired) {
 351                                         targs_for_instance = new TypeExpression[targs.Length];
 352                                         targs_for_instance[0] = targs[0];
 353                                 }
 354                         } else {
 355                                 mutator = null;
 356                         }
 357
 358                         for (int i = 0; i < dyn_args_count; ++i) {
 359                                 Argument a = arguments[i];
 360                                 if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
 361                                         has_ref_out_argument = true;
 362
 363                                 var t = a.Type;
 364
 365                                 // Convert any internal type like dynamic or null to object
 366                                 if (t.Kind == MemberKind.InternalCompilerType)
 367                                         t = ec.BuiltinTypes.Object;
 368
 369                                 if (targs_for_instance != null)
 370                                         targs_for_instance[i + 1] = new TypeExpression (t, loc);
 371
 372                                 if (mutator != null)
 373                                         t = t.Mutate (mutator);
 374
 375                                 targs[i + 1] = new TypeExpression (t, loc);
 376                         }
 377
 378                         TypeExpr del_type = null;
 379                         TypeExpr del_type_instance_access = null;
 380                         if (!has_ref_out_argument) {
 381                                 string d_name = isStatement ? "Action" : "Func";
 382
 383                                 TypeExpr te = null;
 384                                 Namespace type_ns = module.GlobalRootNamespace.GetNamespace ("System", true);
 385                                 if (type_ns != null) {
 386                                         te = type_ns.LookupType (module, d_name, dyn_args_count + default_args, LookupMode.Normal, loc);
 387                                 }
 388
 389                                 if (te != null) {
 390                                         if (!isStatement) {
 391                                                 var t = type;
 392                                                 if (t.Kind == MemberKind.InternalCompilerType)
 393                                                         t = ec.BuiltinTypes.Object;
 394
 395                                                 if (targs_for_instance != null)
 396                                                         targs_for_instance[targs_for_instance.Length - 1] = new TypeExpression (t, loc);
 397
 398                                                 if (mutator != null)
 399                                                         t = t.Mutate (mutator);
 400
 401                                                 targs[targs.Length - 1] = new TypeExpression (t, loc);
 402                                         }
 403
 404                                         del_type = new GenericTypeExpr (te.Type, new TypeArguments (targs), loc);
 405                                         if (targs_for_instance != null)
 406                                                 del_type_instance_access = new GenericTypeExpr (te.Type, new TypeArguments (targs_for_instance), loc);
 407                                         else
 408                                                 del_type_instance_access = del_type;
 409                                 }
 410                         }
 411
 412                         //
 413                         // Create custom delegate when no appropriate predefined delegate has been found
 414                         //
 415                         Delegate d;
 416                         if (del_type == null) {
 417                                 TypeSpec rt = isStatement ? ec.BuiltinTypes.Void : type;
 418                                 Parameter[] p = new Parameter[dyn_args_count + 1];
 419                                 p[0] = new Parameter (targs[0], "p0", Parameter.Modifier.NONE, null, loc);
 420
 421                                 var site = ec.CreateDynamicSite ();
 422                                 int index = site.Types == null ? 0 : site.Types.Count;
 423
 424                                 if (mutator != null)
 425                                         rt = mutator.Mutate (rt);
 426
 427                                 for (int i = 1; i < dyn_args_count + 1; ++i) {
 428                                         p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
 429                                 }
 430
 431                                 d = new Delegate (site.NamespaceEntry, site, new TypeExpression (rt, loc),
 432                                         Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
 433                                         new MemberName ("Container" + index.ToString ("X")),
 434                                         new ParametersCompiled (p), null);
 435
 436                                 d.CreateType ();
 437                                 d.DefineType ();
 438                                 d.Define ();
 439                                 d.Emit ();
 440
 441                                 site.AddDelegate (d);
 442                                 del_type = new TypeExpression (d.CurrentType, loc);
 443                                 if (targs_for_instance != null) {
 444                                         del_type_instance_access = null;
 445                                 } else {
 446                                         del_type_instance_access = del_type;
 447                                 }
 448                         } else {
 449                                 d = null;
 450                         }
 451
 452                         var site_type_decl = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec, new TypeArguments (del_type), loc);
 453                         var field = site_container.CreateCallSiteField (site_type_decl, loc);
 454                         if (field == null)
 455                                 return;
 456
 457                         if (del_type_instance_access == null) {
 458                                 var dt = d.CurrentType.DeclaringType.MakeGenericType (module, context_mvars.Select (l => l.Type).ToArray ());
 459                                 del_type_instance_access = new TypeExpression (MemberCache.GetMember (dt, d.CurrentType), loc);
 460                         }
 461
 462                         var instanceAccessExprType = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec,
 463                                 new TypeArguments (del_type_instance_access), loc);
 464
 465                         if (instanceAccessExprType.ResolveAsType (ec.MemberContext) == null)
 466                                 return;
 467
 468                         bool inflate_using_mvar = context_mvars != null && ec.IsAnonymousStoreyMutateRequired;
 469
 470                         TypeSpec gt;
 471                         if (inflate_using_mvar || context_mvars == null) {
 472                                 gt = site_container.CurrentType;
 473                         } else {
 474                                 gt = site_container.CurrentType.MakeGenericType (module, context_mvars.Select (l => l.Type).ToArray ());
 475                         }
 476
 477                         // When site container already exists the inflated version has to be
 478                         // updated manually to contain newly created field
 479                         if (gt is InflatedTypeSpec && site_container.Fields.Count > 1) {
 480                                 var tparams = gt.MemberDefinition.TypeParametersCount > 0 ? gt.MemberDefinition.TypeParameters : TypeParameterSpec.EmptyTypes;
 481                                 var inflator = new TypeParameterInflator (module, gt, tparams, gt.TypeArguments);
 482                                 gt.MemberCache.AddMember (field.InflateMember (inflator));
 483                         }
 484
 485                         FieldExpr site_field_expr = new FieldExpr (MemberCache.GetMember (gt, field), loc);
 486
 487                         BlockContext bc = new BlockContext (ec.MemberContext, null, ec.BuiltinTypes.Void);
 488                         SymbolWriter.OpenCompilerGeneratedBlock (ec);
 489
 490                         Arguments args = new Arguments (1);
 491                         args.Add (new Argument (binder));
 492                         StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (instanceAccessExprType, "Create"), args)));
 493
 494                         if (s.Resolve (bc)) {
 495                                 Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc), loc), s, loc);
 496                                 init.Emit (ec);
 497                         }
 498
 499                         args = new Arguments (1 + dyn_args_count);
 500                         args.Add (new Argument (site_field_expr));
 501                         if (arguments != null) {
 502                                 int arg_pos = 1;
 503                                 foreach (Argument a in arguments) {
 504                                         if (a is NamedArgument) {
 505                                                 // Name is not valid in this context
 506                                                 args.Add (new Argument (a.Expr, a.ArgType));
 507                                         } else {
 508                                                 args.Add (a);
 509                                         }
 510
 511                                         if (inflate_using_mvar && a.Type != targs[arg_pos].Type)
 512                                                 a.Expr.Type = targs[arg_pos].Type;
 513
 514                                         ++arg_pos;
 515                                 }
 516                         }
 517
 518                         Expression target = new DelegateInvocation (new MemberAccess (site_field_expr, "Target", loc).Resolve (bc), args, loc).Resolve (bc);
 519                         if (target != null)
 520                                 target.Emit (ec);
 521
 522                         SymbolWriter.CloseCompilerGeneratedBlock (ec);
 523                 }
 524
 525                 public static MemberAccess GetBinderNamespace (Location loc)
 526                 {
 527                         return new MemberAccess (new MemberAccess (
 528                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "Microsoft", loc), "CSharp", loc), "RuntimeBinder", loc);
 529                 }
 530
 531                 protected MemberAccess GetBinder (string name, Location loc)
 532                 {
 533                         return new MemberAccess (new TypeExpression (binder_type, loc), name, loc);
 534                 }
 535         }
 536
 537         //
 538         // Dynamic member access compound assignment for events
 539         //
 540         class DynamicEventCompoundAssign : ExpressionStatement
 541         {
 542                 class IsEvent : DynamicExpressionStatement, IDynamicBinder
 543                 {
 544                         string name;
 545
 546                         public IsEvent (string name, Arguments args, Location loc)
 547                                 : base (null, args, loc)
 548                         {
 549                                 this.name = name;
 550                                 binder = this;
 551                         }
 552
 553                         public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 554                         {
 555                                 type = ec.BuiltinTypes.Bool;
 556
 557                                 Arguments binder_args = new Arguments (3);
 558
 559                                 binder_args.Add (new Argument (new BinderFlags (0, this)));
 560                                 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
 561                                 binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 562
 563                                 return new Invocation (GetBinder ("IsEvent", loc), binder_args);
 564                         }
 565                 }
 566
 567                 Expression condition;
 568                 ExpressionStatement invoke, assign;
 569
 570                 public DynamicEventCompoundAssign (string name, Arguments args, ExpressionStatement assignment, ExpressionStatement invoke, Location loc)
 571                 {
 572                         condition = new IsEvent (name, args, loc);
 573                         this.invoke = invoke;
 574                         this.assign = assignment;
 575                         this.loc = loc;
 576                 }
 577
 578                 public override Expression CreateExpressionTree (ResolveContext ec)
 579                 {
 580                         return condition.CreateExpressionTree (ec);
 581                 }
 582
 583                 protected override Expression DoResolve (ResolveContext rc)
 584                 {
 585                         type = rc.BuiltinTypes.Dynamic;
 586                         eclass = ExprClass.Value;
 587                         condition = condition.Resolve (rc);
 588                         return this;
 589                 }
 590
 591                 public override void Emit (EmitContext ec)
 592                 {
 593                         var rc = new ResolveContext (ec.MemberContext);
 594                         var expr = new Conditional (new BooleanExpression (condition), invoke, assign, loc).Resolve (rc);
 595                         expr.Emit (ec);
 596                 }
 597
 598                 public override void EmitStatement (EmitContext ec)
 599                 {
 600                         var stmt = new If (condition, new StatementExpression (invoke), new StatementExpression (assign), loc);
 601                         stmt.Emit (ec);
 602                 }
 603         }
 604
 605         class DynamicConversion : DynamicExpressionStatement, IDynamicBinder
 606         {
 607                 public DynamicConversion (TypeSpec targetType, CSharpBinderFlags flags, Arguments args, Location loc)
 608                         : base (null, args, loc)
 609                 {
 610                         type = targetType;
 611                         base.flags = flags;
 612                         base.binder = this;
 613                 }
 614
 615                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 616                 {
 617                         Arguments binder_args = new Arguments (3);
 618
 619                         flags |= ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
 620
 621                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 622                         binder_args.Add (new Argument (new TypeOf (type, loc)));
 623                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 624                         return new Invocation (GetBinder ("Convert", loc), binder_args);
 625                 }
 626         }
 627
 628         class DynamicConstructorBinder : DynamicExpressionStatement, IDynamicBinder
 629         {
 630                 public DynamicConstructorBinder (TypeSpec type, Arguments args, Location loc)
 631                         : base (null, args, loc)
 632                 {
 633                         this.type = type;
 634                         base.binder = this;
 635                 }
 636
 637                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 638                 {
 639                         Arguments binder_args = new Arguments (3);
 640
 641                         binder_args.Add (new Argument (new BinderFlags (0, this)));
 642                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 643                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 644
 645                         return new Invocation (GetBinder ("InvokeConstructor", loc), binder_args);
 646                 }
 647         }
 648
 649         class DynamicIndexBinder : DynamicMemberAssignable
 650         {
 651                 bool can_be_mutator;
 652
 653                 public DynamicIndexBinder (Arguments args, Location loc)
 654                         : base (args, loc)
 655                 {
 656                 }
 657
 658                 public DynamicIndexBinder (CSharpBinderFlags flags, Arguments args, Location loc)
 659                         : this (args, loc)
 660                 {
 661                         base.flags = flags;
 662                 }
 663
 664                 protected override Expression DoResolve (ResolveContext ec)
 665                 {
 666                         can_be_mutator = true;
 667                         return base.DoResolve (ec);
 668                 }
 669
 670                 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
 671                 {
 672                         Arguments binder_args = new Arguments (3);
 673
 674                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 675                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 676                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 677
 678                         isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
 679                         return new Invocation (GetBinder (isSet ? "SetIndex" : "GetIndex", loc), binder_args);
 680                 }
 681
 682                 protected override Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
 683                 {
 684                         //
 685                         // Indexer has arguments which complicates things as the setter and getter
 686                         // are called in two steps when unary mutator is used. We have to make a
 687                         // copy of all variable arguments to not duplicate any side effect.
 688                         //
 689                         // ++d[++arg, Foo ()]
 690                         //
 691
 692                         if (!can_be_mutator)
 693                                 return base.CreateSetterArguments (rc, rhs);
 694
 695                         var setter_args = new Arguments (Arguments.Count + 1);
 696                         for (int i = 0; i < Arguments.Count; ++i) {
 697                                 var expr = Arguments[i].Expr;
 698
 699                                 if (expr is Constant || expr is VariableReference || expr is This) {
 700                                         setter_args.Add (Arguments [i]);
 701                                         continue;
 702                                 }
 703
 704                                 LocalVariable temp = LocalVariable.CreateCompilerGenerated (expr.Type, rc.CurrentBlock, loc);
 705                                 expr = new SimpleAssign (temp.CreateReferenceExpression (rc, expr.Location), expr).Resolve (rc);
 706                                 Arguments[i].Expr = temp.CreateReferenceExpression (rc, expr.Location).Resolve (rc);
 707                                 setter_args.Add (Arguments [i].Clone (expr));
 708                         }
 709
 710                         setter_args.Add (new Argument (rhs));
 711                         return setter_args;
 712                 }
 713         }
 714
 715         class DynamicInvocation : DynamicExpressionStatement, IDynamicBinder
 716         {
 717                 ATypeNameExpression member;
 718
 719                 public DynamicInvocation (ATypeNameExpression member, Arguments args, Location loc)
 720                         : base (null, args, loc)
 721                 {
 722                         base.binder = this;
 723                         this.member = member;
 724                 }
 725
 726                 //
 727                 // When a return type is known not to be dynamic
 728                 //
 729                 public DynamicInvocation (ATypeNameExpression member, Arguments args, TypeSpec type, Location loc)
 730                         : this (member, args, loc)
 731                 {
 732                         this.type = type;
 733                 }
 734
 735                 public static DynamicInvocation CreateSpecialNameInvoke (ATypeNameExpression member, Arguments args, Location loc)
 736                 {
 737                         return new DynamicInvocation (member, args, loc) {
 738                                 flags = CSharpBinderFlags.InvokeSpecialName
 739                         };
 740                 }
 741
 742                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 743                 {
 744                         Arguments binder_args = new Arguments (member != null ? 5 : 3);
 745                         bool is_member_access = member is MemberAccess;
 746
 747                         CSharpBinderFlags call_flags;
 748                         if (!is_member_access && member is SimpleName) {
 749                                 call_flags = CSharpBinderFlags.InvokeSimpleName;
 750                                 is_member_access = true;
 751                         } else {
 752                                 call_flags = 0;
 753                         }
 754
 755                         binder_args.Add (new Argument (new BinderFlags (call_flags, this)));
 756
 757                         if (is_member_access)
 758                                 binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, member.Name, member.Location)));
 759
 760                         if (member != null && member.HasTypeArguments) {
 761                                 TypeArguments ta = member.TypeArguments;
 762                                 if (ta.Resolve (ec)) {
 763                                         var targs = new ArrayInitializer (ta.Count, loc);
 764                                         foreach (TypeSpec t in ta.Arguments)
 765                                                 targs.Add (new TypeOf (t, loc));
 766
 767                                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (targs, loc)));
 768                                 }
 769                         } else if (is_member_access) {
 770                                 binder_args.Add (new Argument (new NullLiteral (loc)));
 771                         }
 772
 773                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 774
 775                         Expression real_args;
 776                         if (args == null) {
 777                                 // Cannot be null because .NET trips over
 778                                 real_args = new ArrayCreation (
 779                                         new MemberAccess (GetBinderNamespace (loc), "CSharpArgumentInfo", loc),
 780                                         new ArrayInitializer (0, loc), loc);
 781                         } else {
 782                                 real_args = new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc);
 783                         }
 784
 785                         binder_args.Add (new Argument (real_args));
 786
 787                         return new Invocation (GetBinder (is_member_access ? "InvokeMember" : "Invoke", loc), binder_args);
 788                 }
 789
 790                 public override void EmitStatement (EmitContext ec)
 791                 {
 792                         flags |= CSharpBinderFlags.ResultDiscarded;
 793                         base.EmitStatement (ec);
 794                 }
 795         }
 796
 797         class DynamicMemberBinder : DynamicMemberAssignable
 798         {
 799                 readonly string name;
 800
 801                 public DynamicMemberBinder (string name, Arguments args, Location loc)
 802                         : base (args, loc)
 803                 {
 804                         this.name = name;
 805                 }
 806
 807                 public DynamicMemberBinder (string name, CSharpBinderFlags flags, Arguments args, Location loc)
 808                         : this (name, args, loc)
 809                 {
 810                         base.flags = flags;
 811                 }
 812
 813                 protected override Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet)
 814                 {
 815                         Arguments binder_args = new Arguments (4);
 816
 817                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 818                         binder_args.Add (new Argument (new StringLiteral (ec.BuiltinTypes, name, loc)));
 819                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 820                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 821
 822                         isSet |= (flags & CSharpBinderFlags.ValueFromCompoundAssignment) != 0;
 823                         return new Invocation (GetBinder (isSet ? "SetMember" : "GetMember", loc), binder_args);
 824                 }
 825         }
 826
 827         //
 828         // Any member binder which can be source and target of assignment
 829         //
 830         abstract class DynamicMemberAssignable : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
 831         {
 832                 Expression setter;
 833                 Arguments setter_args;
 834
 835                 protected DynamicMemberAssignable (Arguments args, Location loc)
 836                         : base (null, args, loc)
 837                 {
 838                         base.binder = this;
 839                 }
 840
 841                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 842                 {
 843                         //
 844                         // DoResolve always uses getter
 845                         //
 846                         return CreateCallSiteBinder (ec, args, false);
 847                 }
 848
 849                 protected abstract Expression CreateCallSiteBinder (ResolveContext ec, Arguments args, bool isSet);
 850
 851                 protected virtual Arguments CreateSetterArguments (ResolveContext rc, Expression rhs)
 852                 {
 853                         var setter_args = new Arguments (Arguments.Count + 1);
 854                         setter_args.AddRange (Arguments);
 855                         setter_args.Add (new Argument (rhs));
 856                         return setter_args;
 857                 }
 858
 859                 public override Expression DoResolveLValue (ResolveContext rc, Expression right_side)
 860                 {
 861                         if (right_side == EmptyExpression.OutAccess) {
 862                                 right_side.DoResolveLValue (rc, this);
 863                                 return null;
 864                         }
 865
 866                         if (DoResolveCore (rc)) {
 867                                 setter_args = CreateSetterArguments (rc, right_side);
 868                                 setter = CreateCallSiteBinder (rc, setter_args, true);
 869                         }
 870
 871                         eclass = ExprClass.Variable;
 872                         return this;
 873                 }
 874
 875                 public override void Emit (EmitContext ec)
 876                 {
 877                         // It's null for ResolveLValue used without assignment
 878                         if (binder_expr == null)
 879                                 EmitCall (ec, setter, Arguments, false);
 880                         else
 881                                 base.Emit (ec);
 882                 }
 883
 884                 public override void EmitStatement (EmitContext ec)
 885                 {
 886                         // It's null for ResolveLValue used without assignment
 887                         if (binder_expr == null)
 888                                 EmitCall (ec, setter, Arguments, true);
 889                         else
 890                                 base.EmitStatement (ec);
 891                 }
 892
 893                 #region IAssignMethod Members
 894
 895                 public void Emit (EmitContext ec, bool leave_copy)
 896                 {
 897                         throw new NotImplementedException ();
 898                 }
 899
 900                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
 901                 {
 902                         EmitCall (ec, setter, setter_args, !leave_copy);
 903                 }
 904
 905                 #endregion
 906         }
 907
 908         class DynamicUnaryConversion : DynamicExpressionStatement, IDynamicBinder
 909         {
 910                 readonly string name;
 911
 912                 public DynamicUnaryConversion (string name, Arguments args, Location loc)
 913                         : base (null, args, loc)
 914                 {
 915                         this.name = name;
 916                         base.binder = this;
 917                 }
 918
 919                 public static DynamicUnaryConversion CreateIsTrue (ResolveContext rc, Arguments args, Location loc)
 920                 {
 921                         return new DynamicUnaryConversion ("IsTrue", args, loc) { type = rc.BuiltinTypes.Bool };
 922                 }
 923
 924                 public static DynamicUnaryConversion CreateIsFalse (ResolveContext rc, Arguments args, Location loc)
 925                 {
 926                         return new DynamicUnaryConversion ("IsFalse", args, loc) { type = rc.BuiltinTypes.Bool };
 927                 }
 928
 929                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 930                 {
 931                         Arguments binder_args = new Arguments (4);
 932
 933                         MemberAccess sle = new MemberAccess (new MemberAccess (
 934                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
 935
 936                         var flags = ec.HasSet (ResolveContext.Options.CheckedScope) ? CSharpBinderFlags.CheckedContext : 0;
 937
 938                         binder_args.Add (new Argument (new BinderFlags (flags, this)));
 939                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), name, loc)));
 940                         binder_args.Add (new Argument (new TypeOf (ec.CurrentType, loc)));
 941                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation (args.CreateDynamicBinderArguments (ec), loc)));
 942
 943                         return new Invocation (GetBinder ("UnaryOperation", loc), binder_args);
 944                 }
 945         }
 946
 947         sealed class DynamicSiteClass : HoistedStoreyClass
 948         {
 949                 public DynamicSiteClass (TypeContainer parent, MemberBase host, TypeParameter[] tparams)
 950                         : base (parent, MakeMemberName (host, "DynamicSite", parent.DynamicSitesCounter, tparams, Location.Null), tparams, Modifiers.STATIC)
 951                 {
 952                         parent.DynamicSitesCounter++;
 953                 }
 954
 955                 public FieldSpec CreateCallSiteField (FullNamedExpression type, Location loc)
 956                 {
 957                         int index = fields == null ? 0 : fields.Count;
 958                         Field f = new HoistedField (this, type, Modifiers.PUBLIC | Modifiers.STATIC, "Site" + index.ToString ("X"), null, loc);
 959                         f.Define ();
 960
 961                         AddField (f);
 962                         return f.Spec;
 963                 }
 964         }
 965 }