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.Collections;
  13
  14 #if NET_4_0
  15 using System.Dynamic;
  16 #endif
  17
  18 namespace Mono.CSharp
  19 {
  20         class DynamicTypeExpr : TypeExpr
  21         {
  22                 public DynamicTypeExpr (Location loc)
  23                 {
  24                         this.loc = loc;
  25
  26                         type = InternalType.Dynamic;
  27                         eclass = ExprClass.Type;
  28                 }
  29
  30                 public override bool CheckAccessLevel (IMemberContext ds)
  31                 {
  32                         return true;
  33                 }
  34
  35                 protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
  36                 {
  37                         return this;
  38                 }
  39         }
  40
  41         //
  42         // Expression created from runtime dynamic object value
  43         //
  44         public class RuntimeValueExpression : Expression, IAssignMethod
  45         {
  46 #if !NET_4_0
  47                 public class DynamicMetaObject { public Type RuntimeType; }
  48 #endif
  49
  50                 readonly DynamicMetaObject obj;
  51
  52                 // When strongly typed expression is required
  53                 readonly bool typed;
  54
  55                 public RuntimeValueExpression (DynamicMetaObject obj, bool typed)
  56                 {
  57                         this.obj = obj;
  58                         this.typed = typed;
  59                         this.type = obj.RuntimeType;
  60                         this.eclass = ExprClass.Value;
  61                 }
  62
  63                 public override Expression CreateExpressionTree (ResolveContext ec)
  64                 {
  65                         throw new NotImplementedException ();
  66                 }
  67
  68                 public override Expression DoResolve (ResolveContext ec)
  69                 {
  70                         return this;
  71                 }
  72
  73                 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
  74                 {
  75                         return this;
  76                 }
  77
  78                 public override void Emit (EmitContext ec)
  79                 {
  80                         throw new NotImplementedException ();
  81                 }
  82
  83                 #region IAssignMethod Members
  84
  85                 public void Emit (EmitContext ec, bool leave_copy)
  86                 {
  87                         throw new NotImplementedException ();
  88                 }
  89
  90                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
  91                 {
  92                         throw new NotImplementedException ();
  93                 }
  94
  95                 #endregion
  96
  97 #if NET_4_0
  98                 public override System.Linq.Expressions.Expression MakeExpression (BuilderContext ctx)
  99                 {
 100                         if (typed && obj.Expression.Type != type)
 101                                 return System.Linq.Expressions.Expression.Convert (obj.Expression, type);
 102
 103                         return obj.Expression;
 104                 }
 105 #endif
 106         }
 107
 108         interface IDynamicBinder
 109         {
 110                 Expression CreateCallSiteBinder (ResolveContext ec, Arguments args);
 111         }
 112
 113         class DynamicExpressionStatement : ExpressionStatement
 114         {
 115                 class StaticDataClass : CompilerGeneratedClass
 116                 {
 117                         public StaticDataClass ()
 118                                 : base (new RootDeclSpace (new NamespaceEntry (null, null, null)),
 119                                         new MemberName (CompilerGeneratedClass.MakeName (null, "c", "DynamicSites", 0)),
 120                                         Modifiers.INTERNAL | Modifiers.STATIC)
 121                         {
 122                                 ModFlags &= ~Modifiers.SEALED;
 123                         }
 124                 }
 125
 126                 static StaticDataClass global_site_container;
 127                 static int field_counter;
 128                 static int container_counter;
 129
 130                 readonly Arguments arguments;
 131                 protected IDynamicBinder binder;
 132                 Expression binder_expr;
 133
 134                 public DynamicExpressionStatement (IDynamicBinder binder, Arguments args, Location loc)
 135                 {
 136                         this.binder = binder;
 137                         this.arguments = args;
 138                         this.loc = loc;
 139                 }
 140
 141                 public Arguments Arguments {
 142                         get {
 143                                 return arguments;
 144                         }
 145                 }
 146
 147                 static TypeContainer CreateSiteContainer ()
 148                 {
 149                         if (global_site_container == null) {
 150                                 global_site_container = new StaticDataClass ();
 151                                 RootContext.ToplevelTypes.AddCompilerGeneratedClass (global_site_container);
 152                                 global_site_container.DefineType ();
 153                                 global_site_container.Define ();
 154 //                              global_site_container.EmitType ();
 155
 156                                 RootContext.RegisterCompilerGeneratedType (global_site_container.TypeBuilder);
 157                         }
 158
 159                         return global_site_container;
 160                 }
 161
 162                 static Field CreateSiteField (FullNamedExpression type)
 163                 {
 164                         TypeContainer site_container = CreateSiteContainer ();
 165                         Field f = new Field (site_container, type, Modifiers.PUBLIC | Modifiers.STATIC,
 166                                 new MemberName ("Site" +  field_counter++), null);
 167                         f.Define ();
 168
 169                         site_container.AddField (f);
 170                         return f;
 171                 }
 172
 173                 public override Expression CreateExpressionTree (ResolveContext ec)
 174                 {
 175                         throw new NotImplementedException ();
 176                 }
 177
 178                 public override Expression DoResolve (ResolveContext ec)
 179                 {
 180                         if (eclass != ExprClass.Invalid)
 181                                 return this;
 182
 183                         if (TypeManager.call_site_type == null)
 184                                 TypeManager.call_site_type = TypeManager.CoreLookupType (ec.Compiler,
 185                                         "System.Runtime.CompilerServices", "CallSite", Kind.Class, true);
 186
 187                         if (TypeManager.generic_call_site_type == null)
 188                                 TypeManager.generic_call_site_type = TypeManager.CoreLookupType (ec.Compiler,
 189                                         "System.Runtime.CompilerServices", "CallSite`1", Kind.Class, true);
 190
 191                         eclass = ExprClass.Value;
 192
 193                         if (type == null)
 194                                 type = InternalType.Dynamic;
 195
 196                         binder_expr = binder.CreateCallSiteBinder (ec, arguments);
 197                         return this;
 198                 }
 199
 200                 public override void Emit (EmitContext ec)
 201                 {
 202                         EmitCall (ec, false);
 203                 }
 204
 205                 public override void EmitStatement (EmitContext ec)
 206                 {
 207                         EmitCall (ec, true);
 208                 }
 209
 210                 void EmitCall (EmitContext ec, bool isStatement)
 211                 {
 212                         int dyn_args_count = arguments == null ? 0 : arguments.Count;
 213                         TypeExpr site_type = CreateSiteType (RootContext.ToplevelTypes.Compiler, isStatement, dyn_args_count);
 214                         FieldExpr site_field_expr = new FieldExpr (CreateSiteField (site_type).FieldBuilder, loc);
 215
 216                         SymbolWriter.OpenCompilerGeneratedBlock (ec.ig);
 217
 218                         Arguments args = new Arguments (1);
 219                         args.Add (new Argument (binder_expr));
 220                         StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (site_type, "Create"), args)));
 221
 222                         BlockContext bc = new BlockContext (ec.MemberContext, null, TypeManager.void_type);
 223                         if (s.Resolve (bc)) {
 224                                 Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc)), s, loc);
 225                                 init.Emit (ec);
 226                         }
 227
 228                         args = new Arguments (1 + dyn_args_count);
 229                         args.Add (new Argument (site_field_expr));
 230                         if (arguments != null) {
 231                                 foreach (Argument a in arguments) {
 232                                         if (a is NamedArgument) {
 233                                                 // Name is not valid in this context
 234                                                 args.Add (new Argument (a.Expr, a.ArgType));
 235                                                 continue;
 236                                         }
 237
 238                                         args.Add (a);
 239                                 }
 240                         }
 241
 242                         ResolveContext rc = new ResolveContext (ec.MemberContext);
 243                         Expression target = new DelegateInvocation (new MemberAccess (site_field_expr, "Target", loc).Resolve (rc), args, loc).Resolve (rc);
 244                         if (target != null)
 245                                 target.Emit (ec);
 246
 247                         SymbolWriter.CloseCompilerGeneratedBlock (ec.ig);
 248                 }
 249
 250                 public static MemberAccess GetBinderNamespace (Location loc)
 251                 {
 252                         return new MemberAccess (new MemberAccess (
 253                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "Microsoft", loc), "CSharp", loc), "RuntimeBinder", loc);
 254                 }
 255
 256                 TypeExpr CreateSiteType (CompilerContext ctx, bool isStatement, int dyn_args_count)
 257                 {
 258                         int default_args = isStatement ? 1 : 2;
 259
 260                         bool has_ref_out_argument = false;
 261                         FullNamedExpression[] targs = new FullNamedExpression[dyn_args_count + default_args];
 262                         targs [0] = new TypeExpression (TypeManager.call_site_type, loc);
 263                         for (int i = 0; i < dyn_args_count; ++i) {
 264                                 Type arg_type;
 265                                 Argument a = arguments [i];
 266                                 if (a.Type == TypeManager.null_type)
 267                                         arg_type = TypeManager.object_type;
 268                                 else
 269                                         arg_type = TypeManager.TypeToReflectionType (a.Type);
 270
 271                                 if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
 272                                         has_ref_out_argument = true;
 273
 274                                 targs [i + 1] = new TypeExpression (arg_type, loc);
 275                         }
 276
 277                         TypeExpr del_type = null;
 278                         if (!has_ref_out_argument) {
 279                                 string d_name = isStatement ? "Action`" : "Func`";
 280
 281                                 Type t = TypeManager.CoreLookupType (ctx, "System", d_name + (dyn_args_count + default_args), Kind.Delegate, false);
 282                                 if (t != null) {
 283                                         if (!isStatement)
 284                                                 targs[targs.Length - 1] = new TypeExpression (TypeManager.TypeToReflectionType (type), loc);
 285
 286                                         del_type = new GenericTypeExpr (t, new TypeArguments (targs), loc);
 287                                 }
 288                         }
 289
 290                         // No appropriate predefined delegate found
 291                         if (del_type == null) {
 292                                 Type rt = isStatement ? TypeManager.void_type : type;
 293                                 Parameter[] p = new Parameter [dyn_args_count + 1];
 294                                 p[0] = new Parameter (targs [0], "p0", Parameter.Modifier.NONE, null, loc);
 295
 296                                 for (int i = 1; i < dyn_args_count + 1; ++i)
 297                                         p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
 298
 299                                 TypeContainer parent = CreateSiteContainer ();
 300                                 Delegate d = new Delegate (parent.NamespaceEntry, parent, new TypeExpression (rt, loc),
 301                                         Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
 302                                         new MemberName ("Container" + container_counter++.ToString ("X")),
 303                                         new ParametersCompiled (p), null);
 304
 305                                 d.DefineType ();
 306                                 d.Define ();
 307
 308                                 parent.AddDelegate (d);
 309                                 del_type = new TypeExpression (d.TypeBuilder, loc);
 310                         }
 311
 312                         TypeExpr site_type = new GenericTypeExpr (TypeManager.generic_call_site_type, new TypeArguments (del_type), loc);
 313                         return site_type;
 314                 }
 315
 316                 public static void Reset ()
 317                 {
 318                         global_site_container = null;
 319                         field_counter = container_counter = 0;
 320                 }
 321         }
 322
 323         //
 324         // Dynamic member access compound assignment for events
 325         //
 326         class DynamicEventCompoundAssign : DynamicExpressionStatement, IDynamicBinder
 327         {
 328                 string name;
 329                 ExpressionStatement assignment;
 330                 ExpressionStatement invoke;
 331
 332                 public DynamicEventCompoundAssign (string name, Arguments args, ExpressionStatement assignment, ExpressionStatement invoke, Location loc)
 333                         : base (null, args, loc)
 334                 {
 335                         this.name = name;
 336                         this.assignment = assignment;
 337                         this.invoke = invoke;
 338                         base.binder = this;
 339
 340                         // Used by += or -= only
 341                         type = TypeManager.bool_type;
 342                 }
 343
 344                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 345                 {
 346                         Arguments binder_args = new Arguments (2);
 347                         MemberAccess binder = GetBinderNamespace (loc);
 348
 349                         binder_args.Add (new Argument (new StringLiteral (name, loc)));
 350                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 351
 352                         return new New (new MemberAccess (binder, "CSharpIsEventBinder", loc), binder_args, loc);
 353                 }
 354
 355                 public override void EmitStatement (EmitContext ec)
 356                 {
 357                         Statement cond = new If (
 358                                 new Binary (Binary.Operator.Equality, this, new BoolLiteral (true, loc)),
 359                                 new StatementExpression (invoke),
 360                                 new StatementExpression (assignment),
 361                                 loc);
 362                         cond.Emit (ec);
 363                 }
 364         }
 365
 366         class DynamicConversion : DynamicExpressionStatement, IDynamicBinder
 367         {
 368                 bool is_explicit;
 369
 370                 public DynamicConversion (Type targetType, bool isExplicit, Arguments args, Location loc)
 371                         : base (null, args, loc)
 372                 {
 373                         type = targetType;
 374                         is_explicit = isExplicit;
 375                         base.binder = this;
 376                 }
 377
 378                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 379                 {
 380                         Arguments binder_args = new Arguments (2);
 381                         MemberAccess binder = GetBinderNamespace (loc);
 382
 383                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
 384                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (binder, "CSharpConversionKind", loc),
 385                                 is_explicit ? "ExplicitConversion" : "ImplicitConversion", loc)));
 386                         binder_args.Add (new Argument (new BoolLiteral (ec.HasSet (ResolveContext.Options.CheckedScope), loc)));
 387
 388                         return new New (new MemberAccess (binder, "CSharpConvertBinder", loc), binder_args, loc);
 389                 }
 390         }
 391
 392         class DynamicIndexBinder : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
 393         {
 394                 readonly bool isSet;
 395
 396                 public DynamicIndexBinder (bool isSet, Arguments args, Location loc)
 397                         : base (null, args, loc)
 398                 {
 399                         base.binder = this;
 400                         this.isSet = isSet;
 401                 }
 402
 403                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 404                 {
 405                         Arguments binder_args = new Arguments (2);
 406                         MemberAccess binder = GetBinderNamespace (loc);
 407
 408                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 409                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
 410
 411                         return new New (new MemberAccess (binder, isSet ? "CSharpSetIndexBinder" : "CSharpGetIndexBinder", loc), binder_args, loc);
 412                 }
 413
 414                 #region IAssignMethod Members
 415
 416                 public void Emit (EmitContext ec, bool leave_copy)
 417                 {
 418                         throw new NotImplementedException ();
 419                 }
 420
 421                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
 422                 {
 423                         EmitStatement (ec);
 424                 }
 425
 426                 #endregion
 427         }
 428
 429         class DynamicInvocation : DynamicExpressionStatement, IDynamicBinder
 430         {
 431                 ATypeNameExpression member;
 432
 433                 public DynamicInvocation (ATypeNameExpression member, Arguments args, Location loc)
 434                         : base (null, args, loc)
 435                 {
 436                         base.binder = this;
 437                         this.member = member;
 438                 }
 439
 440                 public DynamicInvocation (ATypeNameExpression member, Arguments args, Type type, Location loc)
 441                         : this (member, args, loc)
 442                 {
 443                         // When a return type is known not to be dynamic
 444                         this.type = type;
 445                 }
 446
 447                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 448                 {
 449                         Arguments binder_args = new Arguments (member != null ? 5 : 3);
 450                         MemberAccess binder = GetBinderNamespace (loc);
 451                         bool is_member_access = member is MemberAccess;
 452
 453                         string call_flags;
 454                         if (!is_member_access && member is SimpleName) {
 455                                 call_flags = "SimpleNameCall";
 456                                 is_member_access = true;
 457                         } else {
 458                                 call_flags = "None";
 459                         }
 460
 461                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (binder, "CSharpCallFlags", loc), call_flags, loc)));
 462
 463                         if (is_member_access)
 464                                 binder_args.Add (new Argument (new StringLiteral (member.Name, member.Location)));
 465
 466                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 467
 468                         if (member != null && member.HasTypeArguments) {
 469                                 TypeArguments ta = member.TypeArguments;
 470                                 if (ta.Resolve (ec)) {
 471                                         ArrayList targs = new ArrayList (ta.Count);
 472                                         foreach (Type t in ta.Arguments)
 473                                                 targs.Add (new TypeOf (new TypeExpression (t, loc), loc));
 474
 475                                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", targs, loc)));
 476                                 }
 477                         } else if (is_member_access) {
 478                                 binder_args.Add (new Argument (new NullLiteral (loc)));
 479                         }
 480
 481                         Expression real_args;
 482                         if (args == null) {
 483                                 // Cannot be null because .NET trips over
 484                                 real_args = new ArrayCreation (new MemberAccess (binder, "CSharpArgumentInfo", loc), "[]", new ArrayList (0), loc);
 485                         } else {
 486                                 real_args = new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc);
 487                         }
 488
 489                         binder_args.Add (new Argument (real_args));
 490
 491                         return new New (new MemberAccess (binder,
 492                                 is_member_access ? "CSharpInvokeMemberBinder" : "CSharpInvokeBinder", loc), binder_args, loc);
 493                 }
 494         }
 495
 496         class DynamicMemberBinder : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
 497         {
 498                 readonly bool isSet;
 499                 readonly string name;
 500
 501                 public DynamicMemberBinder (bool isSet, string name, Arguments args, Location loc)
 502                         : base (null, args, loc)
 503                 {
 504                         base.binder = this;
 505                         this.isSet = isSet;
 506                         this.name = name;
 507                 }
 508
 509                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 510                 {
 511                         Arguments binder_args = new Arguments (3);
 512                         MemberAccess binder = GetBinderNamespace (loc);
 513
 514                         binder_args.Add (new Argument (new StringLiteral (name, loc)));
 515                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 516                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
 517
 518                         return new New (new MemberAccess (binder, isSet ? "CSharpSetMemberBinder" : "CSharpGetMemberBinder", loc), binder_args, loc);
 519                 }
 520
 521                 #region IAssignMethod Members
 522
 523                 public void Emit (EmitContext ec, bool leave_copy)
 524                 {
 525                         throw new NotImplementedException ();
 526                 }
 527
 528                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
 529                 {
 530                         EmitStatement (ec);
 531                 }
 532
 533                 #endregion
 534         }
 535
 536         class DynamicUnaryConversion : DynamicExpressionStatement, IDynamicBinder
 537         {
 538                 string name;
 539
 540                 public DynamicUnaryConversion (string name, Arguments args, Location loc)
 541                         : base (null, args, loc)
 542                 {
 543                         this.name = name;
 544                         base.binder = this;
 545                         if (name == "IsTrue" || name == "IsFalse")
 546                                 type = TypeManager.bool_type;
 547                 }
 548
 549                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 550                 {
 551                         Arguments binder_args = new Arguments (3);
 552
 553                         MemberAccess sle = new MemberAccess (new MemberAccess (
 554                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
 555
 556                         MemberAccess binder = GetBinderNamespace (loc);
 557
 558                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), name, loc)));
 559                         binder_args.Add (new Argument (new BoolLiteral (ec.HasSet (ResolveContext.Options.CheckedScope), loc)));
 560                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
 561
 562                         return new New (new MemberAccess (binder, "CSharpUnaryOperationBinder", loc), binder_args, loc);
 563                 }
 564         }
 565 }