mcs/mcs/codegen.cs

   1 //
   2 // codegen.cs: The code generator
   3 //
   4 // Authors:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //   Marek Safar (marek.safar@gmail.com)
   7 //
   8 // Copyright 2001, 2002, 2003 Ximian, Inc.
   9 // Copyright 2004 Novell, Inc.
  10 //
  11
  12 using System;
  13 using System.Collections.Generic;
  14
  15 #if STATIC
  16 using MetaType = IKVM.Reflection.Type;
  17 using IKVM.Reflection;
  18 using IKVM.Reflection.Emit;
  19 #else
  20 using MetaType = System.Type;
  21 using System.Reflection;
  22 using System.Reflection.Emit;
  23 #endif
  24
  25 namespace Mono.CSharp
  26 {
  27         /// <summary>
  28         ///   An Emit Context is created for each body of code (from methods,
  29         ///   properties bodies, indexer bodies or constructor bodies)
  30         /// </summary>
  31         public class EmitContext : BuilderContext
  32         {
  33                 // TODO: Has to be private
  34                 public ILGenerator ig;
  35
  36                 /// <summary>
  37                 ///   The value that is allowed to be returned or NULL if there is no
  38                 ///   return type.
  39                 /// </summary>
  40                 TypeSpec return_type;
  41
  42                 /// <summary>
  43                 ///   Keeps track of the Type to LocalBuilder temporary storage created
  44                 ///   to store structures (used to compute the address of the structure
  45                 ///   value on structure method invocations)
  46                 /// </summary>
  47                 Dictionary<TypeSpec, object> temporary_storage;
  48
  49                 /// <summary>
  50                 ///   The location where we store the return value.
  51                 /// </summary>
  52                 public LocalBuilder return_value;
  53
  54                 /// <summary>
  55                 ///   The location where return has to jump to return the
  56                 ///   value
  57                 /// </summary>
  58                 public Label ReturnLabel;
  59
  60                 /// <summary>
  61                 ///   If we already defined the ReturnLabel
  62                 /// </summary>
  63                 public bool HasReturnLabel;
  64
  65                 /// <summary>
  66                 ///   Current loop begin and end labels.
  67                 /// </summary>
  68                 public Label LoopBegin, LoopEnd;
  69
  70                 /// <summary>
  71                 ///   Default target in a switch statement.   Only valid if
  72                 ///   InSwitch is true
  73                 /// </summary>
  74                 public Label DefaultTarget;
  75
  76                 /// <summary>
  77                 ///   If this is non-null, points to the current switch statement
  78                 /// </summary>
  79                 public Switch Switch;
  80
  81                 /// <summary>
  82                 ///  Whether we are inside an anonymous method.
  83                 /// </summary>
  84                 public AnonymousExpression CurrentAnonymousMethod;
  85
  86                 public readonly IMemberContext MemberContext;
  87
  88                 DynamicSiteClass dynamic_site_container;
  89
  90                 // TODO: Replace IMemberContext with MemberCore
  91                 public EmitContext (IMemberContext rc, ILGenerator ig, TypeSpec return_type)
  92                 {
  93                         this.MemberContext = rc;
  94                         this.ig = ig;
  95
  96                         this.return_type = return_type;
  97
  98 #if STATIC
  99                         ig.__CleverExceptionBlockAssistance ();
 100 #endif
 101                 }
 102
 103                 #region Properties
 104
 105                 public TypeSpec CurrentType {
 106                         get { return MemberContext.CurrentType; }
 107                 }
 108
 109                 public TypeParameter[] CurrentTypeParameters {
 110                         get { return MemberContext.CurrentTypeParameters; }
 111                 }
 112
 113                 public MemberCore CurrentTypeDefinition {
 114                         get { return MemberContext.CurrentMemberDefinition; }
 115                 }
 116
 117                 public bool IsStatic {
 118                         get { return MemberContext.IsStatic; }
 119                 }
 120
 121                 bool IsAnonymousStoreyMutateRequired {
 122                         get {
 123                                 return CurrentAnonymousMethod != null &&
 124                                         CurrentAnonymousMethod.Storey != null &&
 125                                         CurrentAnonymousMethod.Storey.Mutator != null;
 126                         }
 127                 }
 128
 129                 // Has to be used for emitter errors only
 130                 public Report Report {
 131                         get { return MemberContext.Compiler.Report; }
 132                 }
 133
 134                 public TypeSpec ReturnType {
 135                         get {
 136                                 return return_type;
 137                         }
 138                 }
 139                 #endregion
 140
 141                 /// <summary>
 142                 ///   This is called immediately before emitting an IL opcode to tell the symbol
 143                 ///   writer to which source line this opcode belongs.
 144                 /// </summary>
 145                 public void Mark (Location loc)
 146                 {
 147                         if (!SymbolWriter.HasSymbolWriter || HasSet (Options.OmitDebugInfo) || loc.IsNull)
 148                                 return;
 149
 150                         SymbolWriter.MarkSequencePoint (ig, loc);
 151                 }
 152
 153                 public void DefineLocalVariable (string name, LocalBuilder builder)
 154                 {
 155                         SymbolWriter.DefineLocalVariable (name, builder);
 156                 }
 157
 158                 public void BeginCatchBlock (TypeSpec type)
 159                 {
 160                         ig.BeginCatchBlock (type.GetMetaInfo ());
 161                 }
 162
 163                 public void BeginExceptionBlock ()
 164                 {
 165                         ig.BeginExceptionBlock ();
 166                 }
 167
 168                 public void BeginFinallyBlock ()
 169                 {
 170                         ig.BeginFinallyBlock ();
 171                 }
 172
 173                 public void BeginScope ()
 174                 {
 175                         SymbolWriter.OpenScope(ig);
 176                 }
 177
 178                 public void EndExceptionBlock ()
 179                 {
 180                         ig.EndExceptionBlock ();
 181                 }
 182
 183                 public void EndScope ()
 184                 {
 185                         SymbolWriter.CloseScope(ig);
 186                 }
 187
 188                 //
 189                 // Creates a nested container in this context for all dynamic compiler generated stuff
 190                 //
 191                 public DynamicSiteClass CreateDynamicSite ()
 192                 {
 193                         if (dynamic_site_container == null) {
 194                                 var mc = MemberContext.CurrentMemberDefinition as MemberBase;
 195                                 dynamic_site_container = new DynamicSiteClass (CurrentTypeDefinition.Parent.PartialContainer, mc, CurrentTypeParameters);
 196
 197                                 CurrentTypeDefinition.Module.AddCompilerGeneratedClass (dynamic_site_container);
 198                                 dynamic_site_container.CreateType ();
 199                                 dynamic_site_container.DefineType ();
 200                                 dynamic_site_container.ResolveTypeParameters ();
 201                                 dynamic_site_container.Define ();
 202                         }
 203
 204                         return dynamic_site_container;
 205                 }
 206
 207                 public LocalBuilder DeclareLocal (TypeSpec type, bool pinned)
 208                 {
 209                         if (IsAnonymousStoreyMutateRequired)
 210                                 type = CurrentAnonymousMethod.Storey.Mutator.Mutate (type);
 211
 212                         return ig.DeclareLocal (type.GetMetaInfo (), pinned);
 213                 }
 214
 215                 public Label DefineLabel ()
 216                 {
 217                         return ig.DefineLabel ();
 218                 }
 219
 220                 public void MarkLabel (Label label)
 221                 {
 222                         ig.MarkLabel (label);
 223                 }
 224
 225                 public void Emit (OpCode opcode)
 226                 {
 227                         ig.Emit (opcode);
 228                 }
 229
 230                 public void Emit (OpCode opcode, LocalBuilder local)
 231                 {
 232                         ig.Emit (opcode, local);
 233                 }
 234
 235                 public void Emit (OpCode opcode, string arg)
 236                 {
 237                         ig.Emit (opcode, arg);
 238                 }
 239
 240                 public void Emit (OpCode opcode, double arg)
 241                 {
 242                         ig.Emit (opcode, arg);
 243                 }
 244
 245                 public void Emit (OpCode opcode, float arg)
 246                 {
 247                         ig.Emit (opcode, arg);
 248                 }
 249
 250                 public void Emit (OpCode opcode, int arg)
 251                 {
 252                         ig.Emit (opcode, arg);
 253                 }
 254
 255                 public void Emit (OpCode opcode, byte arg)
 256                 {
 257                         ig.Emit (opcode, arg);
 258                 }
 259
 260                 public void Emit (OpCode opcode, Label label)
 261                 {
 262                         ig.Emit (opcode, label);
 263                 }
 264
 265                 public void Emit (OpCode opcode, Label[] labels)
 266                 {
 267                         ig.Emit (opcode, labels);
 268                 }
 269
 270                 public void Emit (OpCode opcode, TypeSpec type)
 271                 {
 272                         if (IsAnonymousStoreyMutateRequired)
 273                                 type = CurrentAnonymousMethod.Storey.Mutator.Mutate (type);
 274
 275                         ig.Emit (opcode, type.GetMetaInfo ());
 276                 }
 277
 278                 public void Emit (OpCode opcode, FieldSpec field)
 279                 {
 280                         if (IsAnonymousStoreyMutateRequired)
 281                                 field = field.Mutate (CurrentAnonymousMethod.Storey.Mutator);
 282
 283                         ig.Emit (opcode, field.GetMetaInfo ());
 284                 }
 285
 286                 public void Emit (OpCode opcode, MethodSpec method)
 287                 {
 288                         if (IsAnonymousStoreyMutateRequired)
 289                                 method = method.Mutate (CurrentAnonymousMethod.Storey.Mutator);
 290
 291                         if (method.IsConstructor)
 292                                 ig.Emit (opcode, (ConstructorInfo) method.GetMetaInfo ());
 293                         else
 294                                 ig.Emit (opcode, (MethodInfo) method.GetMetaInfo ());
 295                 }
 296
 297                 // TODO: REMOVE breaks mutator
 298                 public void Emit (OpCode opcode, MethodInfo method)
 299                 {
 300                         ig.Emit (opcode, method);
 301                 }
 302
 303                 public void Emit (OpCode opcode, MethodSpec method, MetaType[] vargs)
 304                 {
 305                         // TODO MemberCache: This should mutate too
 306                         ig.EmitCall (opcode, (MethodInfo) method.GetMetaInfo (), vargs);
 307                 }
 308
 309                 public void EmitArrayNew (ArrayContainer ac)
 310                 {
 311                         if (ac.Rank == 1) {
 312                                 Emit (OpCodes.Newarr, ac.Element);
 313                         } else {
 314                                 if (IsAnonymousStoreyMutateRequired)
 315                                         ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
 316
 317                                 ig.Emit (OpCodes.Newobj, ac.GetConstructor ());
 318                         }
 319                 }
 320
 321                 public void EmitArrayAddress (ArrayContainer ac)
 322                 {
 323                         if (ac.Element.IsGenericParameter)
 324                                 ig.Emit (OpCodes.Readonly);
 325
 326                         if (ac.Rank > 1) {
 327                                 if (IsAnonymousStoreyMutateRequired)
 328                                         ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
 329
 330                                 ig.Emit (OpCodes.Call, ac.GetAddressMethod ());
 331                         } else {
 332                                 Emit (OpCodes.Ldelema, ac.Element);
 333                         }
 334                 }
 335
 336                 //
 337                 // Emits the right opcode to load from an array
 338                 //
 339                 public void EmitArrayLoad (ArrayContainer ac)
 340                 {
 341                         if (ac.Rank > 1) {
 342                                 if (IsAnonymousStoreyMutateRequired)
 343                                         ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
 344
 345                                 ig.Emit (OpCodes.Call, ac.GetGetMethod ());
 346                                 return;
 347                         }
 348
 349                         var type = ac.Element;
 350                         if (TypeManager.IsEnumType (type))
 351                                 type = EnumSpec.GetUnderlyingType (type);
 352
 353                         if (type == TypeManager.byte_type || type == TypeManager.bool_type)
 354                                 Emit (OpCodes.Ldelem_U1);
 355                         else if (type == TypeManager.sbyte_type)
 356                                 Emit (OpCodes.Ldelem_I1);
 357                         else if (type == TypeManager.short_type)
 358                                 Emit (OpCodes.Ldelem_I2);
 359                         else if (type == TypeManager.ushort_type || type == TypeManager.char_type)
 360                                 Emit (OpCodes.Ldelem_U2);
 361                         else if (type == TypeManager.int32_type)
 362                                 Emit (OpCodes.Ldelem_I4);
 363                         else if (type == TypeManager.uint32_type)
 364                                 Emit (OpCodes.Ldelem_U4);
 365                         else if (type == TypeManager.uint64_type)
 366                                 Emit (OpCodes.Ldelem_I8);
 367                         else if (type == TypeManager.int64_type)
 368                                 Emit (OpCodes.Ldelem_I8);
 369                         else if (type == TypeManager.float_type)
 370                                 Emit (OpCodes.Ldelem_R4);
 371                         else if (type == TypeManager.double_type)
 372                                 Emit (OpCodes.Ldelem_R8);
 373                         else if (type == TypeManager.intptr_type)
 374                                 Emit (OpCodes.Ldelem_I);
 375                         else if (TypeManager.IsStruct (type)) {
 376                                 Emit (OpCodes.Ldelema, type);
 377                                 Emit (OpCodes.Ldobj, type);
 378                         } else if (type.IsGenericParameter) {
 379                                 Emit (OpCodes.Ldelem, type);
 380                         } else if (type.IsPointer)
 381                                 Emit (OpCodes.Ldelem_I);
 382                         else
 383                                 Emit (OpCodes.Ldelem_Ref);
 384                 }
 385
 386                 //
 387                 // Emits the right opcode to store to an array
 388                 //
 389                 public void EmitArrayStore (ArrayContainer ac)
 390                 {
 391                         if (ac.Rank > 1) {
 392                                 if (IsAnonymousStoreyMutateRequired)
 393                                         ac = (ArrayContainer) ac.Mutate (CurrentAnonymousMethod.Storey.Mutator);
 394
 395                                 ig.Emit (OpCodes.Call, ac.GetSetMethod ());
 396                                 return;
 397                         }
 398
 399                         var type = ac.Element;
 400
 401                         if (type.IsEnum)
 402                                 type = EnumSpec.GetUnderlyingType (type);
 403
 404                         if (type == TypeManager.byte_type || type == TypeManager.sbyte_type || type == TypeManager.bool_type)
 405                                 Emit (OpCodes.Stelem_I1);
 406                         else if (type == TypeManager.short_type || type == TypeManager.ushort_type || type == TypeManager.char_type)
 407                                 Emit (OpCodes.Stelem_I2);
 408                         else if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
 409                                 Emit (OpCodes.Stelem_I4);
 410                         else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
 411                                 Emit (OpCodes.Stelem_I8);
 412                         else if (type == TypeManager.float_type)
 413                                 Emit (OpCodes.Stelem_R4);
 414                         else if (type == TypeManager.double_type)
 415                                 Emit (OpCodes.Stelem_R8);
 416                         else if (type == TypeManager.intptr_type)
 417                                 Emit (OpCodes.Stobj, type);
 418                         else if (TypeManager.IsStruct (type))
 419                                 Emit (OpCodes.Stobj, type);
 420                         else if (type.IsGenericParameter)
 421                                 Emit (OpCodes.Stelem, type);
 422                         else if (type.IsPointer)
 423                                 Emit (OpCodes.Stelem_I);
 424                         else
 425                                 Emit (OpCodes.Stelem_Ref);
 426                 }
 427
 428                 public void EmitInt (int i)
 429                 {
 430                         switch (i) {
 431                         case -1:
 432                                 ig.Emit (OpCodes.Ldc_I4_M1);
 433                                 break;
 434
 435                         case 0:
 436                                 ig.Emit (OpCodes.Ldc_I4_0);
 437                                 break;
 438
 439                         case 1:
 440                                 ig.Emit (OpCodes.Ldc_I4_1);
 441                                 break;
 442
 443                         case 2:
 444                                 ig.Emit (OpCodes.Ldc_I4_2);
 445                                 break;
 446
 447                         case 3:
 448                                 ig.Emit (OpCodes.Ldc_I4_3);
 449                                 break;
 450
 451                         case 4:
 452                                 ig.Emit (OpCodes.Ldc_I4_4);
 453                                 break;
 454
 455                         case 5:
 456                                 ig.Emit (OpCodes.Ldc_I4_5);
 457                                 break;
 458
 459                         case 6:
 460                                 ig.Emit (OpCodes.Ldc_I4_6);
 461                                 break;
 462
 463                         case 7:
 464                                 ig.Emit (OpCodes.Ldc_I4_7);
 465                                 break;
 466
 467                         case 8:
 468                                 ig.Emit (OpCodes.Ldc_I4_8);
 469                                 break;
 470
 471                         default:
 472                                 if (i >= -128 && i <= 127) {
 473                                         ig.Emit (OpCodes.Ldc_I4_S, (sbyte) i);
 474                                 } else
 475                                         ig.Emit (OpCodes.Ldc_I4, i);
 476                                 break;
 477                         }
 478                 }
 479
 480                 public void EmitLong (long l)
 481                 {
 482                         if (l >= int.MinValue && l <= int.MaxValue) {
 483                                 EmitInt (unchecked ((int) l));
 484                                 ig.Emit (OpCodes.Conv_I8);
 485                                 return;
 486                         }
 487
 488                         if (l >= 0 && l <= uint.MaxValue) {
 489                                 EmitInt (unchecked ((int) l));
 490                                 ig.Emit (OpCodes.Conv_U8);
 491                                 return;
 492                         }
 493
 494                         ig.Emit (OpCodes.Ldc_I8, l);
 495                 }
 496
 497                 //
 498                 // Load the object from the pointer.
 499                 //
 500                 public void EmitLoadFromPtr (TypeSpec t)
 501                 {
 502                         if (t == TypeManager.int32_type)
 503                                 ig.Emit (OpCodes.Ldind_I4);
 504                         else if (t == TypeManager.uint32_type)
 505                                 ig.Emit (OpCodes.Ldind_U4);
 506                         else if (t == TypeManager.short_type)
 507                                 ig.Emit (OpCodes.Ldind_I2);
 508                         else if (t == TypeManager.ushort_type)
 509                                 ig.Emit (OpCodes.Ldind_U2);
 510                         else if (t == TypeManager.char_type)
 511                                 ig.Emit (OpCodes.Ldind_U2);
 512                         else if (t == TypeManager.byte_type)
 513                                 ig.Emit (OpCodes.Ldind_U1);
 514                         else if (t == TypeManager.sbyte_type)
 515                                 ig.Emit (OpCodes.Ldind_I1);
 516                         else if (t == TypeManager.uint64_type)
 517                                 ig.Emit (OpCodes.Ldind_I8);
 518                         else if (t == TypeManager.int64_type)
 519                                 ig.Emit (OpCodes.Ldind_I8);
 520                         else if (t == TypeManager.float_type)
 521                                 ig.Emit (OpCodes.Ldind_R4);
 522                         else if (t == TypeManager.double_type)
 523                                 ig.Emit (OpCodes.Ldind_R8);
 524                         else if (t == TypeManager.bool_type)
 525                                 ig.Emit (OpCodes.Ldind_I1);
 526                         else if (t == TypeManager.intptr_type)
 527                                 ig.Emit (OpCodes.Ldind_I);
 528                         else if (t.IsEnum) {
 529                                 if (t == TypeManager.enum_type)
 530                                         ig.Emit (OpCodes.Ldind_Ref);
 531                                 else
 532                                         EmitLoadFromPtr (EnumSpec.GetUnderlyingType (t));
 533                         } else if (TypeManager.IsStruct (t) || TypeManager.IsGenericParameter (t))
 534                                 Emit (OpCodes.Ldobj, t);
 535                         else if (t.IsPointer)
 536                                 ig.Emit (OpCodes.Ldind_I);
 537                         else
 538                                 ig.Emit (OpCodes.Ldind_Ref);
 539                 }
 540
 541                 //
 542                 // The stack contains the pointer and the value of type `type'
 543                 //
 544                 public void EmitStoreFromPtr (TypeSpec type)
 545                 {
 546                         if (type.IsEnum)
 547                                 type = EnumSpec.GetUnderlyingType (type);
 548
 549                         if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
 550                                 ig.Emit (OpCodes.Stind_I4);
 551                         else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
 552                                 ig.Emit (OpCodes.Stind_I8);
 553                         else if (type == TypeManager.char_type || type == TypeManager.short_type ||
 554                                  type == TypeManager.ushort_type)
 555                                 ig.Emit (OpCodes.Stind_I2);
 556                         else if (type == TypeManager.float_type)
 557                                 ig.Emit (OpCodes.Stind_R4);
 558                         else if (type == TypeManager.double_type)
 559                                 ig.Emit (OpCodes.Stind_R8);
 560                         else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
 561                                  type == TypeManager.bool_type)
 562                                 ig.Emit (OpCodes.Stind_I1);
 563                         else if (type == TypeManager.intptr_type)
 564                                 ig.Emit (OpCodes.Stind_I);
 565                         else if (TypeManager.IsStruct (type) || TypeManager.IsGenericParameter (type))
 566                                 ig.Emit (OpCodes.Stobj, type.GetMetaInfo ());
 567                         else
 568                                 ig.Emit (OpCodes.Stind_Ref);
 569                 }
 570
 571                 /// <summary>
 572                 ///   Returns a temporary storage for a variable of type t as
 573                 ///   a local variable in the current body.
 574                 /// </summary>
 575                 public LocalBuilder GetTemporaryLocal (TypeSpec t)
 576                 {
 577                         if (temporary_storage != null) {
 578                                 object o;
 579                                 if (temporary_storage.TryGetValue (t, out o)) {
 580                                         if (o is Stack<LocalBuilder>) {
 581                                                 var s = (Stack<LocalBuilder>) o;
 582                                                 o = s.Count == 0 ? null : s.Pop ();
 583                                         } else {
 584                                                 temporary_storage.Remove (t);
 585                                         }
 586                                 }
 587                                 if (o != null)
 588                                         return (LocalBuilder) o;
 589                         }
 590                         return DeclareLocal (t, false);
 591                 }
 592
 593                 public void FreeTemporaryLocal (LocalBuilder b, TypeSpec t)
 594                 {
 595                         if (temporary_storage == null) {
 596                                 temporary_storage = new Dictionary<TypeSpec, object> (ReferenceEquality<TypeSpec>.Default);
 597                                 temporary_storage.Add (t, b);
 598                                 return;
 599                         }
 600                         object o;
 601
 602                         if (!temporary_storage.TryGetValue (t, out o)) {
 603                                 temporary_storage.Add (t, b);
 604                                 return;
 605                         }
 606                         var s = o as Stack<LocalBuilder>;
 607                         if (s == null) {
 608                                 s = new Stack<LocalBuilder> ();
 609                                 s.Push ((LocalBuilder)o);
 610                                 temporary_storage [t] = s;
 611                         }
 612                         s.Push (b);
 613                 }
 614
 615                 /// <summary>
 616                 ///   ReturnValue creates on demand the LocalBuilder for the
 617                 ///   return value from the function.  By default this is not
 618                 ///   used.  This is only required when returns are found inside
 619                 ///   Try or Catch statements.
 620                 ///
 621                 ///   This method is typically invoked from the Emit phase, so
 622                 ///   we allow the creation of a return label if it was not
 623                 ///   requested during the resolution phase.   Could be cleaned
 624                 ///   up, but it would replicate a lot of logic in the Emit phase
 625                 ///   of the code that uses it.
 626                 /// </summary>
 627                 public LocalBuilder TemporaryReturn ()
 628                 {
 629                         if (return_value == null){
 630                                 return_value = DeclareLocal (return_type, false);
 631                                 if (!HasReturnLabel){
 632                                         ReturnLabel = DefineLabel ();
 633                                         HasReturnLabel = true;
 634                                 }
 635                         }
 636
 637                         return return_value;
 638                 }
 639         }
 640 }