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 using System.Reflection.Emit;
  14
  15 #if NET_4_0
  16 using System.Dynamic;
  17 using SLE = System.Linq.Expressions;
  18 #endif
  19
  20 namespace Mono.CSharp
  21 {
  22         class DynamicTypeExpr : TypeExpr
  23         {
  24                 public DynamicTypeExpr (Location loc)
  25                 {
  26                         this.loc = loc;
  27
  28                         type = InternalType.Dynamic;
  29                         eclass = ExprClass.Type;
  30                 }
  31
  32                 public override bool CheckAccessLevel (IMemberContext ds)
  33                 {
  34                         return true;
  35                 }
  36
  37                 protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
  38                 {
  39                         return this;
  40                 }
  41         }
  42
  43         //
  44         // Expression created from runtime dynamic object value
  45         //
  46         public class RuntimeValueExpression : Expression, IDynamicAssign
  47         {
  48 #if !NET_4_0
  49                 public class DynamicMetaObject { public Type RuntimeType; }
  50 #endif
  51
  52                 readonly DynamicMetaObject obj;
  53
  54                 public RuntimeValueExpression (DynamicMetaObject obj)
  55                 {
  56                         this.obj = obj;
  57                         this.type = obj.RuntimeType;
  58                         this.eclass = ExprClass.Variable;
  59                 }
  60
  61                 public override Expression CreateExpressionTree (ResolveContext ec)
  62                 {
  63                         throw new NotImplementedException ();
  64                 }
  65
  66                 public override Expression DoResolve (ResolveContext ec)
  67                 {
  68                         return this;
  69                 }
  70
  71                 public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
  72                 {
  73                         return this;
  74                 }
  75
  76                 public override void Emit (EmitContext ec)
  77                 {
  78                         throw new NotImplementedException ();
  79                 }
  80
  81                 #region IAssignMethod Members
  82
  83                 public void Emit (EmitContext ec, bool leave_copy)
  84                 {
  85                         throw new NotImplementedException ();
  86                 }
  87
  88                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
  89                 {
  90                         throw new NotImplementedException ();
  91                 }
  92
  93                 #endregion
  94
  95 #if NET_4_0
  96                 public SLE.Expression MakeAssignExpression (BuilderContext ctx)
  97                 {
  98                         return obj.Expression;
  99                 }
 100
 101                 public override SLE.Expression MakeExpression (BuilderContext ctx)
 102                 {
 103                         return SLE.Expression.Convert (obj.Expression, type);
 104                 }
 105 #endif
 106
 107                 public DynamicMetaObject MetaObject {
 108                         get { return obj; }
 109                 }
 110         }
 111
 112         interface IDynamicBinder
 113         {
 114                 Expression CreateCallSiteBinder (ResolveContext ec, Arguments args);
 115         }
 116
 117         //
 118         // Extends standard assignment interface for expressions
 119         // supported by dynamic resolver
 120         //
 121         interface IDynamicAssign : IAssignMethod
 122         {
 123 #if NET_4_0
 124                 SLE.Expression MakeAssignExpression (BuilderContext ctx);
 125 #endif
 126         }
 127
 128         class DynamicExpressionStatement : ExpressionStatement
 129         {
 130                 class StaticDataClass : CompilerGeneratedClass
 131                 {
 132                         public StaticDataClass ()
 133                                 : base (new RootDeclSpace (new NamespaceEntry (null, null, null)),
 134                                         new MemberName (CompilerGeneratedClass.MakeName (null, "c", "DynamicSites", 0)),
 135                                         Modifiers.INTERNAL | Modifiers.STATIC)
 136                         {
 137                                 ModFlags &= ~Modifiers.SEALED;
 138                         }
 139                 }
 140
 141                 static StaticDataClass global_site_container;
 142                 static int field_counter;
 143                 static int container_counter;
 144
 145                 readonly Arguments arguments;
 146                 protected IDynamicBinder binder;
 147                 Expression binder_expr;
 148
 149                 public DynamicExpressionStatement (IDynamicBinder binder, Arguments args, Location loc)
 150                 {
 151                         this.binder = binder;
 152                         this.arguments = args;
 153                         this.loc = loc;
 154                 }
 155
 156                 public Arguments Arguments {
 157                         get {
 158                                 return arguments;
 159                         }
 160                 }
 161
 162                 static TypeContainer CreateSiteContainer ()
 163                 {
 164                         if (global_site_container == null) {
 165                                 global_site_container = new StaticDataClass ();
 166                                 RootContext.ToplevelTypes.AddCompilerGeneratedClass (global_site_container);
 167                                 global_site_container.DefineType ();
 168                                 global_site_container.Define ();
 169 //                              global_site_container.EmitType ();
 170
 171                                 RootContext.RegisterCompilerGeneratedType (global_site_container.TypeBuilder);
 172                         }
 173
 174                         return global_site_container;
 175                 }
 176
 177                 static Field CreateSiteField (FullNamedExpression type)
 178                 {
 179                         TypeContainer site_container = CreateSiteContainer ();
 180                         Field f = new Field (site_container, type, Modifiers.PUBLIC | Modifiers.STATIC,
 181                                 new MemberName ("Site" +  field_counter++), null);
 182                         f.Define ();
 183
 184                         site_container.AddField (f);
 185                         return f;
 186                 }
 187
 188                 public override Expression CreateExpressionTree (ResolveContext ec)
 189                 {
 190                         throw new NotImplementedException ();
 191                 }
 192
 193                 public override Expression DoResolve (ResolveContext ec)
 194                 {
 195                         if (eclass != ExprClass.Invalid)
 196                                 return this;
 197
 198                         if (TypeManager.call_site_type == null)
 199                                 TypeManager.call_site_type = TypeManager.CoreLookupType (ec.Compiler,
 200                                         "System.Runtime.CompilerServices", "CallSite", Kind.Class, true);
 201
 202                         if (TypeManager.generic_call_site_type == null)
 203                                 TypeManager.generic_call_site_type = TypeManager.CoreLookupType (ec.Compiler,
 204                                         "System.Runtime.CompilerServices", "CallSite`1", Kind.Class, true);
 205
 206                         eclass = ExprClass.Value;
 207
 208                         if (type == null)
 209                                 type = InternalType.Dynamic;
 210
 211                         binder_expr = binder.CreateCallSiteBinder (ec, arguments);
 212                         return this;
 213                 }
 214
 215                 public override void Emit (EmitContext ec)
 216                 {
 217                         EmitCall (ec);
 218                 }
 219
 220                 public override void EmitStatement (EmitContext ec)
 221                 {
 222                         // All C# created payloads require to have object convertible
 223                         // return type even if we know it won't be used
 224                         EmitCall (ec);
 225                         ec.ig.Emit (OpCodes.Pop);
 226                 }
 227
 228                 void EmitCall (EmitContext ec)
 229                 {
 230                         int dyn_args_count = arguments == null ? 0 : arguments.Count;
 231                         TypeExpr site_type = CreateSiteType (RootContext.ToplevelTypes.Compiler, dyn_args_count);
 232                         FieldExpr site_field_expr = new FieldExpr (CreateSiteField (site_type).FieldBuilder, loc);
 233
 234                         SymbolWriter.OpenCompilerGeneratedBlock (ec.ig);
 235
 236                         Arguments args = new Arguments (1);
 237                         args.Add (new Argument (binder_expr));
 238                         StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (site_type, "Create"), args)));
 239
 240                         BlockContext bc = new BlockContext (ec.MemberContext, null, TypeManager.void_type);
 241                         if (s.Resolve (bc)) {
 242                                 Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc)), s, loc);
 243                                 init.Emit (ec);
 244                         }
 245
 246                         args = new Arguments (1 + dyn_args_count);
 247                         args.Add (new Argument (site_field_expr));
 248                         if (arguments != null) {
 249                                 foreach (Argument a in arguments) {
 250                                         if (a is NamedArgument) {
 251                                                 // Name is not valid in this context
 252                                                 args.Add (new Argument (a.Expr, a.ArgType));
 253                                                 continue;
 254                                         }
 255
 256                                         args.Add (a);
 257                                 }
 258                         }
 259
 260                         Expression target = new DelegateInvocation (new MemberAccess (site_field_expr, "Target", loc).Resolve (bc), args, loc).Resolve (bc);
 261                         if (target != null)
 262                                 target.Emit (ec);
 263
 264                         SymbolWriter.CloseCompilerGeneratedBlock (ec.ig);
 265                 }
 266
 267                 public static MemberAccess GetBinderNamespace (Location loc)
 268                 {
 269                         return new MemberAccess (new MemberAccess (
 270                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "Microsoft", loc), "CSharp", loc), "RuntimeBinder", loc);
 271                 }
 272
 273                 TypeExpr CreateSiteType (CompilerContext ctx, int dyn_args_count)
 274                 {
 275                         const int default_args = 2;
 276
 277                         bool has_ref_out_argument = false;
 278                         FullNamedExpression[] targs = new FullNamedExpression[dyn_args_count + default_args];
 279                         targs [0] = new TypeExpression (TypeManager.call_site_type, loc);
 280                         for (int i = 0; i < dyn_args_count; ++i) {
 281                                 Type arg_type;
 282                                 Argument a = arguments [i];
 283                                 if (a.Type == TypeManager.null_type)
 284                                         arg_type = TypeManager.object_type;
 285                                 else
 286                                         arg_type = TypeManager.TypeToReflectionType (a.Type);
 287
 288                                 if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
 289                                         has_ref_out_argument = true;
 290
 291                                 targs [i + 1] = new TypeExpression (arg_type, loc);
 292                         }
 293
 294                         TypeExpr del_type = null;
 295                         if (!has_ref_out_argument) {
 296                                 Type t = TypeManager.CoreLookupType (ctx, "System", "Func`" + (dyn_args_count + default_args), Kind.Delegate, false);
 297                                 if (t != null) {
 298                                         targs[targs.Length - 1] = new TypeExpression (TypeManager.TypeToReflectionType (type), loc);
 299                                         del_type = new GenericTypeExpr (t, new TypeArguments (targs), loc);
 300                                 }
 301                         }
 302
 303                         // No appropriate predefined delegate found
 304                         if (del_type == null) {
 305                                 Parameter[] p = new Parameter [dyn_args_count + 1];
 306                                 p[0] = new Parameter (targs [0], "p0", Parameter.Modifier.NONE, null, loc);
 307
 308                                 for (int i = 1; i < dyn_args_count + 1; ++i)
 309                                         p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
 310
 311                                 TypeContainer parent = CreateSiteContainer ();
 312                                 Delegate d = new Delegate (parent.NamespaceEntry, parent, new TypeExpression (TypeManager.TypeToReflectionType (type), loc),
 313                                         Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
 314                                         new MemberName ("Container" + container_counter++.ToString ("X")),
 315                                         new ParametersCompiled (p), null);
 316
 317                                 d.DefineType ();
 318                                 d.Define ();
 319
 320                                 parent.AddDelegate (d);
 321                                 del_type = new TypeExpression (d.TypeBuilder, loc);
 322                         }
 323
 324                         TypeExpr site_type = new GenericTypeExpr (TypeManager.generic_call_site_type, new TypeArguments (del_type), loc);
 325                         return site_type;
 326                 }
 327
 328                 public static void Reset ()
 329                 {
 330                         global_site_container = null;
 331                         field_counter = container_counter = 0;
 332                 }
 333         }
 334
 335         //
 336         // Dynamic member access compound assignment for events
 337         //
 338         class DynamicEventCompoundAssign : DynamicExpressionStatement, IDynamicBinder
 339         {
 340                 string name;
 341                 ExpressionStatement assignment;
 342                 ExpressionStatement invoke;
 343
 344                 public DynamicEventCompoundAssign (string name, Arguments args, ExpressionStatement assignment, ExpressionStatement invoke, Location loc)
 345                         : base (null, args, loc)
 346                 {
 347                         this.name = name;
 348                         this.assignment = assignment;
 349                         this.invoke = invoke;
 350                         base.binder = this;
 351
 352                         // Used by += or -= only
 353                         type = TypeManager.bool_type;
 354                 }
 355
 356                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 357                 {
 358                         Arguments binder_args = new Arguments (2);
 359                         MemberAccess binder = GetBinderNamespace (loc);
 360
 361                         binder_args.Add (new Argument (new StringLiteral (name, loc)));
 362                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 363
 364                         return new New (new MemberAccess (binder, "CSharpIsEventBinder", loc), binder_args, loc);
 365                 }
 366
 367                 public override void EmitStatement (EmitContext ec)
 368                 {
 369                         Statement cond = new If (
 370                                 new Binary (Binary.Operator.Equality, this, new BoolLiteral (true, loc)),
 371                                 new StatementExpression (invoke),
 372                                 new StatementExpression (assignment),
 373                                 loc);
 374                         cond.Emit (ec);
 375                 }
 376         }
 377
 378         class DynamicConversion : DynamicExpressionStatement, IDynamicBinder
 379         {
 380                 bool is_explicit;
 381
 382                 public DynamicConversion (Type targetType, bool isExplicit, Arguments args, Location loc)
 383                         : base (null, args, loc)
 384                 {
 385                         type = targetType;
 386                         is_explicit = isExplicit;
 387                         base.binder = this;
 388                 }
 389
 390                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 391                 {
 392                         Arguments binder_args = new Arguments (2);
 393                         MemberAccess binder = GetBinderNamespace (loc);
 394
 395                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
 396                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (binder, "CSharpConversionKind", loc),
 397                                 is_explicit ? "ExplicitConversion" : "ImplicitConversion", loc)));
 398                         binder_args.Add (new Argument (new BoolLiteral (ec.HasSet (ResolveContext.Options.CheckedScope), loc)));
 399
 400                         return new New (new MemberAccess (binder, "CSharpConvertBinder", loc), binder_args, loc);
 401                 }
 402         }
 403
 404         class DynamicIndexBinder : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
 405         {
 406                 readonly bool isSet;
 407
 408                 public DynamicIndexBinder (bool isSet, Arguments args, Location loc)
 409                         : base (null, args, loc)
 410                 {
 411                         base.binder = this;
 412                         this.isSet = isSet;
 413                 }
 414
 415                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 416                 {
 417                         Arguments binder_args = new Arguments (2);
 418                         MemberAccess binder = GetBinderNamespace (loc);
 419
 420                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 421                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
 422
 423                         return new New (new MemberAccess (binder, isSet ? "CSharpSetIndexBinder" : "CSharpGetIndexBinder", loc), binder_args, loc);
 424                 }
 425
 426                 #region IAssignMethod Members
 427
 428                 public void Emit (EmitContext ec, bool leave_copy)
 429                 {
 430                         throw new NotImplementedException ();
 431                 }
 432
 433                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
 434                 {
 435                         if (leave_copy)
 436                                 Emit (ec);
 437                         else
 438                                 EmitStatement (ec);
 439                 }
 440
 441                 #endregion
 442         }
 443
 444         class DynamicInvocation : DynamicExpressionStatement, IDynamicBinder
 445         {
 446                 ATypeNameExpression member;
 447
 448                 public DynamicInvocation (ATypeNameExpression member, Arguments args, Location loc)
 449                         : base (null, args, loc)
 450                 {
 451                         base.binder = this;
 452                         this.member = member;
 453                 }
 454
 455                 public DynamicInvocation (ATypeNameExpression member, Arguments args, Type type, Location loc)
 456                         : this (member, args, loc)
 457                 {
 458                         // When a return type is known not to be dynamic
 459                         this.type = type;
 460                 }
 461
 462                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 463                 {
 464                         Arguments binder_args = new Arguments (member != null ? 5 : 3);
 465                         MemberAccess binder = GetBinderNamespace (loc);
 466                         bool is_member_access = member is MemberAccess;
 467
 468                         string call_flags;
 469                         if (!is_member_access && member is SimpleName) {
 470                                 call_flags = "SimpleNameCall";
 471                                 is_member_access = true;
 472                         } else {
 473                                 call_flags = "None";
 474                         }
 475
 476                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (binder, "CSharpCallFlags", loc), call_flags, loc)));
 477
 478                         if (is_member_access)
 479                                 binder_args.Add (new Argument (new StringLiteral (member.Name, member.Location)));
 480
 481                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 482
 483                         if (member != null && member.HasTypeArguments) {
 484                                 TypeArguments ta = member.TypeArguments;
 485                                 if (ta.Resolve (ec)) {
 486                                         ArrayList targs = new ArrayList (ta.Count);
 487                                         foreach (Type t in ta.Arguments)
 488                                                 targs.Add (new TypeOf (new TypeExpression (t, loc), loc));
 489
 490                                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", targs, loc)));
 491                                 }
 492                         } else if (is_member_access) {
 493                                 binder_args.Add (new Argument (new NullLiteral (loc)));
 494                         }
 495
 496                         Expression real_args;
 497                         if (args == null) {
 498                                 // Cannot be null because .NET trips over
 499                                 real_args = new ArrayCreation (new MemberAccess (binder, "CSharpArgumentInfo", loc), "[]", new ArrayList (0), loc);
 500                         } else {
 501                                 real_args = new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc);
 502                         }
 503
 504                         binder_args.Add (new Argument (real_args));
 505
 506                         return new New (new MemberAccess (binder,
 507                                 is_member_access ? "CSharpInvokeMemberBinder" : "CSharpInvokeBinder", loc), binder_args, loc);
 508                 }
 509         }
 510
 511         class DynamicMemberBinder : DynamicExpressionStatement, IDynamicBinder, IAssignMethod
 512         {
 513                 readonly bool isSet;
 514                 readonly string name;
 515
 516                 public DynamicMemberBinder (bool isSet, string name, Arguments args, Location loc)
 517                         : base (null, args, loc)
 518                 {
 519                         base.binder = this;
 520                         this.isSet = isSet;
 521                         this.name = name;
 522                 }
 523
 524                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 525                 {
 526                         Arguments binder_args = new Arguments (3);
 527                         MemberAccess binder = GetBinderNamespace (loc);
 528
 529                         binder_args.Add (new Argument (new StringLiteral (name, loc)));
 530                         binder_args.Add (new Argument (new TypeOf (new TypeExpression (ec.CurrentType, loc), loc)));
 531                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
 532
 533                         return new New (new MemberAccess (binder, isSet ? "CSharpSetMemberBinder" : "CSharpGetMemberBinder", loc), binder_args, loc);
 534                 }
 535
 536                 #region IAssignMethod Members
 537
 538                 public void Emit (EmitContext ec, bool leave_copy)
 539                 {
 540                         throw new NotImplementedException ();
 541                 }
 542
 543                 public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
 544                 {
 545                         if (leave_copy)
 546                                 Emit (ec);
 547                         else
 548                                 EmitStatement (ec);
 549                 }
 550
 551                 #endregion
 552         }
 553
 554         class DynamicUnaryConversion : DynamicExpressionStatement, IDynamicBinder
 555         {
 556                 string name;
 557
 558                 public DynamicUnaryConversion (string name, Arguments args, Location loc)
 559                         : base (null, args, loc)
 560                 {
 561                         this.name = name;
 562                         base.binder = this;
 563                         if (name == "IsTrue" || name == "IsFalse")
 564                                 type = TypeManager.bool_type;
 565                 }
 566
 567                 public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
 568                 {
 569                         Arguments binder_args = new Arguments (3);
 570
 571                         MemberAccess sle = new MemberAccess (new MemberAccess (
 572                                 new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
 573
 574                         MemberAccess binder = GetBinderNamespace (loc);
 575
 576                         binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), name, loc)));
 577                         binder_args.Add (new Argument (new BoolLiteral (ec.HasSet (ResolveContext.Options.CheckedScope), loc)));
 578                         binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
 579
 580                         return new New (new MemberAccess (binder, "CSharpUnaryOperationBinder", loc), binder_args, loc);
 581                 }
 582         }
 583 }