mcs/mcs/cs-parser.jay

   1 %{
   2 //
   3 // cs-parser.jay: The Parser for the C# compiler
   4 //
   5 // Authors: Miguel de Icaza (miguel@gnu.org)
   6 //          Ravi Pratap     (ravi@ximian.com)
   7 //
   8 // Licensed under the terms of the GNU GPL
   9 //
  10 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  11 // (C) 2004 Novell, Inc
  12 //
  13 // TODO:
  14 //   (1) Figure out why error productions dont work.  `type-declaration' is a
  15 //       great spot to put an `error' because you can reproduce it with this input:
  16 //       "public X { }"
  17 //
  18 // Possible optimization:
  19 //   Run memory profiler with parsing only, and consider dropping
  20 //   arraylists where not needed.   Some pieces can use linked lists.
  21 //
  22 using System.Text;
  23 using System.IO;
  24 using System;
  25
  26 namespace Mono.CSharp
  27 {
  28         using System.Collections;
  29
  30         /// <summary>
  31         ///    The C# Parser
  32         /// </summary>
  33         public class CSharpParser {
  34                 NamespaceEntry  current_namespace;
  35                 TypeContainer   current_container;
  36                 TypeContainer   current_class;
  37
  38                 IIteratorContainer iterator_container;
  39
  40                 /// <summary>
  41                 ///   Current block is used to add statements as we find
  42                 ///   them.
  43                 /// </summary>
  44                 Block      current_block, top_current_block;
  45
  46                 /// <summary>
  47                 ///   This is used by the unary_expression code to resolve
  48                 ///   a name against a parameter.
  49                 /// </summary>
  50                 Parameters current_local_parameters;
  51
  52                 /// <summary>
  53                 ///   Using during property parsing to describe the implicit
  54                 ///   value parameter that is passed to the "set" and "get"accesor
  55                 ///   methods (properties and indexers).
  56                 /// </summary>
  57                 Expression implicit_value_parameter_type;
  58                 Parameters indexer_parameters;
  59
  60                 /// <summary>
  61                 ///   Used to determine if we are parsing the get/set pair
  62                 ///   of an indexer or a property
  63                 /// </summmary>
  64                 bool  parsing_indexer;
  65
  66                 ///
  67                 /// An out-of-band stack.
  68                 ///
  69                 Stack oob_stack;
  70
  71                 ///
  72                 /// Switch stack.
  73                 ///
  74                 Stack switch_stack;
  75
  76                 static public int yacc_verbose_flag;
  77
  78                 // Name of the file we are parsing
  79                 public string name;
  80
  81                 ///
  82                 /// The current file.
  83                 ///
  84                 SourceFile file;
  85
  86                 ///
  87                 /// Temporary Xml documentation cache.
  88                 /// For enum types, we need one more temporary store.
  89                 ///
  90                 string tmpComment;
  91                 string enumTypeComment;
  92
  93                 /// Current attribute target
  94                 string current_attr_target;
  95
  96                 /// assembly and module attribute definitions are enabled
  97                 bool global_attrs_enabled = true;
  98
  99                 bool has_get, has_set;
 100
 101 %}
 102
 103 %token EOF
 104 %token NONE   /* This token is never returned by our lexer */
 105 %token ERROR            // This is used not by the parser, but by the tokenizer.
 106                         // do not remove.
 107
 108 /*
 109  *These are the C# keywords
 110  */
 111 %token FIRST_KEYWORD
 112 %token ABSTRACT
 113 %token AS
 114 %token ADD
 115 %token ASSEMBLY
 116 %token BASE
 117 %token BOOL
 118 %token BREAK
 119 %token BYTE
 120 %token CASE
 121 %token CATCH
 122 %token CHAR
 123 %token CHECKED
 124 %token CLASS
 125 %token CONST
 126 %token CONTINUE
 127 %token DECIMAL
 128 %token DEFAULT
 129 %token DELEGATE
 130 %token DO
 131 %token DOUBLE
 132 %token ELSE
 133 %token ENUM
 134 %token EVENT
 135 %token EXPLICIT
 136 %token EXTERN
 137 %token FALSE
 138 %token FINALLY
 139 %token FIXED
 140 %token FLOAT
 141 %token FOR
 142 %token FOREACH
 143 %token GOTO
 144 %token IF
 145 %token IMPLICIT
 146 %token IN
 147 %token INT
 148 %token INTERFACE
 149 %token INTERNAL
 150 %token IS
 151 %token LOCK
 152 %token LONG
 153 %token NAMESPACE
 154 %token NEW
 155 %token NULL
 156 %token OBJECT
 157 %token OPERATOR
 158 %token OUT
 159 %token OVERRIDE
 160 %token PARAMS
 161 %token PRIVATE
 162 %token PROTECTED
 163 %token PUBLIC
 164 %token READONLY
 165 %token REF
 166 %token RETURN
 167 %token REMOVE
 168 %token SBYTE
 169 %token SEALED
 170 %token SHORT
 171 %token SIZEOF
 172 %token STACKALLOC
 173 %token STATIC
 174 %token STRING
 175 %token STRUCT
 176 %token SWITCH
 177 %token THIS
 178 %token THROW
 179 %token TRUE
 180 %token TRY
 181 %token TYPEOF
 182 %token UINT
 183 %token ULONG
 184 %token UNCHECKED
 185 %token UNSAFE
 186 %token USHORT
 187 %token USING
 188 %token VIRTUAL
 189 %token VOID
 190 %token VOLATILE
 191 %token WHILE
 192 %token ARGLIST
 193 %token PARTIAL
 194
 195 /* C# keywords which are not really keywords */
 196 %token GET           "get"
 197 %token SET           "set"
 198
 199 %left LAST_KEYWORD
 200
 201 /* C# single character operators/punctuation. */
 202 %token OPEN_BRACE    "{"
 203 %token CLOSE_BRACE   "}"
 204 %token OPEN_BRACKET  "["
 205 %token CLOSE_BRACKET "]"
 206 %token OPEN_PARENS   "("
 207 %token CLOSE_PARENS  ")"
 208 %token DOT           "."
 209 %token COMMA         ","
 210 %token COLON         ":"
 211 %token SEMICOLON     ";"
 212 %token TILDE         "~"
 213
 214 %token PLUS           "+"
 215 %token MINUS          "-"
 216 %token BANG           "!"
 217 %token ASSIGN         "="
 218 %token OP_LT          "<"
 219 %token OP_GT          ">"
 220 %token BITWISE_AND    "&"
 221 %token BITWISE_OR     "|"
 222 %token STAR           "*"
 223 %token PERCENT        "%"
 224 %token DIV            "/"
 225 %token CARRET         "^"
 226 %token INTERR         "?"
 227
 228 /* C# multi-character operators. */
 229 %token DOUBLE_COLON           "::"
 230 %token OP_INC                 "++"
 231 %token OP_DEC                 "--"
 232 %token OP_SHIFT_LEFT          "<<"
 233 %token OP_SHIFT_RIGHT         ">>"
 234 %token OP_LE                  "<="
 235 %token OP_GE                  ">="
 236 %token OP_EQ                  "=="
 237 %token OP_NE                  "!="
 238 %token OP_AND                 "&&"
 239 %token OP_OR                  "||"
 240 %token OP_MULT_ASSIGN         "*="
 241 %token OP_DIV_ASSIGN          "/="
 242 %token OP_MOD_ASSIGN          "%="
 243 %token OP_ADD_ASSIGN          "+="
 244 %token OP_SUB_ASSIGN          "-="
 245 %token OP_SHIFT_LEFT_ASSIGN   "<<="
 246 %token OP_SHIFT_RIGHT_ASSIGN  ">>="
 247 %token OP_AND_ASSIGN          "&="
 248 %token OP_XOR_ASSIGN          "^="
 249 %token OP_OR_ASSIGN           "|="
 250 %token OP_PTR                 "->"
 251
 252 /* Numbers */
 253 %token LITERAL_INTEGER           "int literal"
 254 %token LITERAL_FLOAT             "float literal"
 255 %token LITERAL_DOUBLE            "double literal"
 256 %token LITERAL_DECIMAL           "decimal literal"
 257 %token LITERAL_CHARACTER         "character literal"
 258 %token LITERAL_STRING            "string literal"
 259
 260 %token IDENTIFIER
 261 %token CLOSE_PARENS_CAST
 262 %token CLOSE_PARENS_NO_CAST
 263 %token CLOSE_PARENS_OPEN_PARENS
 264 %token CLOSE_PARENS_MINUS
 265
 266 /* Add precedence rules to solve dangling else s/r conflict */
 267 %nonassoc LOWPREC
 268 %nonassoc IF
 269 %nonassoc ELSE
 270 %right ASSIGN
 271 %left OP_OR
 272 %left OP_AND
 273 %left BITWISE_OR
 274 %left BITWISE_AND
 275 %left OP_SHIFT_LEFT OP_SHIFT_RIGHT
 276 %left PLUS MINUS
 277 %left STAR DIV PERCENT
 278 %right BANG CARRET UMINUS
 279 %nonassoc OP_INC OP_DEC
 280 %left OPEN_PARENS
 281 %left OPEN_BRACKET OPEN_BRACE
 282 %left DOT
 283 %nonassoc HIGHPREC
 284
 285 %start compilation_unit
 286 %%
 287
 288 compilation_unit
 289         : outer_declarations opt_EOF
 290         | outer_declarations global_attributes opt_EOF
 291         | global_attributes opt_EOF
 292         | opt_EOF /* allow empty files */
 293         ;
 294
 295 opt_EOF
 296         : /* empty */
 297           {
 298                 Lexer.check_incorrect_doc_comment ();
 299           }
 300         | EOF
 301           {
 302                 Lexer.check_incorrect_doc_comment ();
 303           }
 304         ;
 305
 306 outer_declarations
 307         : outer_declaration
 308         | outer_declarations outer_declaration
 309         ;
 310
 311 outer_declaration
 312         : using_directive
 313         | namespace_member_declaration
 314         ;
 315
 316 using_directives
 317         : using_directive
 318         | using_directives using_directive
 319         ;
 320
 321 using_directive
 322         : using_alias_directive
 323           {
 324                 if (RootContext.Documentation != null)
 325                         Lexer.doc_state = XmlCommentState.Allowed;
 326           }
 327         | using_namespace_directive
 328           {
 329                 if (RootContext.Documentation != null)
 330                         Lexer.doc_state = XmlCommentState.Allowed;
 331           }
 332         ;
 333
 334 using_alias_directive
 335         : USING IDENTIFIER ASSIGN
 336           namespace_or_type_name SEMICOLON
 337           {
 338                 LocatedToken lt = (LocatedToken) $2;
 339                 current_namespace.UsingAlias (lt.Value, (MemberName) $4, (Location) $1);
 340           }
 341         | USING error {
 342                 CheckIdentifierToken (yyToken, GetLocation ($2));
 343           }
 344         ;
 345
 346 using_namespace_directive
 347         : USING namespace_name SEMICOLON
 348           {
 349                 current_namespace.Using ((MemberName) $2, (Location) $1);
 350           }
 351         ;
 352
 353 //
 354 // Strictly speaking, namespaces don't have attributes but
 355 // we parse global attributes along with namespace declarations and then
 356 // detach them
 357 //
 358 namespace_declaration
 359         : opt_attributes NAMESPACE namespace_or_type_name
 360           {
 361                 MemberName name = (MemberName) $3;
 362
 363                 if ($1 != null) {
 364                         Report.Error(1671, name.Location, "A namespace declaration cannot have modifiers or attributes");
 365                 }
 366
 367                 current_namespace = new NamespaceEntry (
 368                         current_namespace, file, name.GetName (), name.Location);
 369           }
 370           namespace_body opt_semicolon
 371           {
 372                 current_namespace = current_namespace.Parent;
 373           }
 374         ;
 375
 376 opt_semicolon
 377         : /* empty */
 378         | SEMICOLON
 379         ;
 380
 381 opt_comma
 382         : /* empty */
 383         | COMMA
 384         ;
 385
 386 namespace_name
 387         : namespace_or_type_name
 388         ;
 389
 390 namespace_body
 391         : OPEN_BRACE
 392           {
 393                 if (RootContext.Documentation != null)
 394                         Lexer.doc_state = XmlCommentState.Allowed;
 395           }
 396           opt_using_directives
 397           opt_namespace_member_declarations
 398           CLOSE_BRACE
 399         ;
 400
 401 opt_using_directives
 402         : /* empty */
 403         | using_directives
 404         ;
 405
 406 opt_namespace_member_declarations
 407         : /* empty */
 408         | namespace_member_declarations
 409         ;
 410
 411 namespace_member_declarations
 412         : namespace_member_declaration
 413         | namespace_member_declarations namespace_member_declaration
 414         ;
 415
 416 namespace_member_declaration
 417         : type_declaration
 418           {
 419                 if ($1 != null) {
 420                         DeclSpace ds = (DeclSpace)$1;
 421
 422                         if ((ds.ModFlags & (Modifiers.PRIVATE|Modifiers.PROTECTED)) != 0){
 423                                 Report.Error (1527, ds.Location,
 424                                 "Namespace elements cannot be explicitly declared as private, protected or protected internal");
 425                         }
 426                 }
 427                 current_namespace.DeclarationFound = true;
 428           }
 429         | namespace_declaration {
 430                 current_namespace.DeclarationFound = true;
 431           }
 432
 433         | field_declaration {
 434                 Report.Error (116, ((MemberCore) $1).Location, "A namespace can only contain types and namespace declarations");
 435           }
 436         | method_declaration {
 437                 Report.Error (116, ((MemberCore) $1).Location, "A namespace can only contain types and namespace declarations");
 438           }
 439         ;
 440
 441 type_declaration
 442         : class_declaration
 443         | struct_declaration
 444         | interface_declaration
 445         | enum_declaration
 446         | delegate_declaration
 447 //
 448 // Enable this when we have handled all errors, because this acts as a generic fallback
 449 //
 450 //      | error {
 451 //              Console.WriteLine ("Token=" + yyToken);
 452 //              Report.Error (1518, GetLocation ($1), "Expected class, struct, interface, enum or delegate");
 453 //        }
 454         ;
 455
 456 //
 457 // Attributes 17.2
 458 //
 459
 460 global_attributes
 461         : attribute_sections
 462 {
 463         if ($1 != null)
 464                 CodeGen.Assembly.AddAttributes (((Attributes)$1).Attrs);
 465
 466         $$ = $1;
 467 }
 468
 469 opt_attributes
 470         : /* empty */
 471           {
 472                 global_attrs_enabled = false;
 473                 $$ = null;
 474       }
 475         | attribute_sections
 476           {
 477                 global_attrs_enabled = false;
 478                 $$ = $1;
 479           }
 480     ;
 481
 482
 483 attribute_sections
 484         : attribute_section
 485           {
 486                 ArrayList sect = (ArrayList) $1;
 487
 488                 if (global_attrs_enabled) {
 489                         if (current_attr_target == "module") {
 490                                 CodeGen.Module.AddAttributes (sect);
 491                                 $$ = null;
 492                         } else if (current_attr_target != null && current_attr_target.Length > 0) {
 493                                 CodeGen.Assembly.AddAttributes (sect);
 494                                 $$ = null;
 495                         } else {
 496                                 $$ = new Attributes (sect);
 497                         }
 498                         if ($$ == null) {
 499                                 if (RootContext.Documentation != null) {
 500                                         Lexer.check_incorrect_doc_comment ();
 501                                         Lexer.doc_state =
 502                                                 XmlCommentState.Allowed;
 503                                 }
 504                         }
 505                 } else {
 506                         $$ = new Attributes (sect);
 507                 }
 508                 current_attr_target = null;
 509           }
 510         | attribute_sections attribute_section
 511           {
 512                 Attributes attrs = $1 as Attributes;
 513                 ArrayList sect = (ArrayList) $2;
 514
 515                 if (global_attrs_enabled) {
 516                         if (current_attr_target == "module") {
 517                                 CodeGen.Module.AddAttributes (sect);
 518                                 $$ = null;
 519                         } else if (current_attr_target == "assembly") {
 520                                 CodeGen.Assembly.AddAttributes (sect);
 521                                 $$ = null;
 522                         } else {
 523                                 if (attrs == null)
 524                                         attrs = new Attributes (sect);
 525                                 else
 526                                         attrs.AddAttributes (sect);
 527                         }
 528                 } else {
 529                         if (attrs == null)
 530                                 attrs = new Attributes (sect);
 531                         else
 532                                 attrs.AddAttributes (sect);
 533                 }
 534                 $$ = attrs;
 535                 current_attr_target = null;
 536           }
 537         ;
 538
 539 attribute_section
 540         : OPEN_BRACKET attribute_target_specifier attribute_list opt_comma CLOSE_BRACKET
 541           {
 542                 $$ = $3;
 543           }
 544         | OPEN_BRACKET attribute_list opt_comma CLOSE_BRACKET
 545           {
 546                 $$ = $2;
 547           }
 548         ;
 549
 550 attribute_target_specifier
 551         : attribute_target COLON
 552           {
 553                 current_attr_target = (string)$1;
 554                 $$ = $1;
 555           }
 556         ;
 557
 558 attribute_target
 559         : IDENTIFIER
 560           {
 561                 LocatedToken lt = (LocatedToken) $1;
 562                 CheckAttributeTarget (lt.Value, lt.Location);
 563                 $$ = lt.Value; // Location won't be required anymore.
 564           }
 565         | EVENT  { $$ = "event"; }
 566         | RETURN { $$ = "return"; }
 567         ;
 568
 569 attribute_list
 570         : attribute
 571           {
 572                 ArrayList attrs = new ArrayList (4);
 573                 attrs.Add ($1);
 574
 575                 $$ = attrs;
 576
 577           }
 578         | attribute_list COMMA attribute
 579           {
 580                 ArrayList attrs = (ArrayList) $1;
 581                 attrs.Add ($3);
 582
 583                 $$ = attrs;
 584           }
 585         ;
 586
 587 attribute
 588         : attribute_name opt_attribute_arguments
 589           {
 590                 MemberName mname = (MemberName) $1;
 591                 ArrayList arguments = (ArrayList) $2;
 592                 MemberName left = mname.Left;
 593                 string identifier = mname.Name;
 594
 595                 Expression left_expr = left == null ? null : left.GetTypeExpression ();
 596
 597                 if (current_attr_target == "assembly" || current_attr_target == "module")
 598                         // FIXME: supply "nameEscaped" parameter here.
 599                         $$ = new GlobalAttribute (current_class, current_attr_target,
 600                                                   left_expr, identifier, arguments, mname.Location, lexer.IsEscapedIdentifier (mname.Location));
 601                 else
 602                         $$ = new Attribute (current_attr_target, left_expr, identifier, arguments, mname.Location, lexer.IsEscapedIdentifier (mname.Location));
 603           }
 604         ;
 605
 606 attribute_name
 607         : namespace_or_type_name  { /* reserved attribute name or identifier: 17.4 */ }
 608         ;
 609
 610 opt_attribute_arguments
 611         : /* empty */   { $$ = null; }
 612         | OPEN_PARENS attribute_arguments CLOSE_PARENS
 613           {
 614                 $$ = $2;
 615           }
 616         ;
 617
 618
 619 attribute_arguments
 620         : opt_positional_argument_list
 621           {
 622                 if ($1 == null)
 623                         $$ = null;
 624                 else {
 625                         ArrayList args = new ArrayList (4);
 626                         args.Add ($1);
 627
 628                         $$ = args;
 629                 }
 630           }
 631         | positional_argument_list COMMA named_argument_list
 632           {
 633                 ArrayList args = new ArrayList (4);
 634                 args.Add ($1);
 635                 args.Add ($3);
 636
 637                 $$ = args;
 638           }
 639         | named_argument_list
 640           {
 641                 ArrayList args = new ArrayList (4);
 642                 args.Add (null);
 643                 args.Add ($1);
 644
 645                 $$ = args;
 646           }
 647         ;
 648
 649
 650 opt_positional_argument_list
 651         : /* empty */           { $$ = null; }
 652         | positional_argument_list
 653         ;
 654
 655 positional_argument_list
 656         : expression
 657           {
 658                 ArrayList args = new ArrayList (4);
 659                 args.Add (new Argument ((Expression) $1, Argument.AType.Expression));
 660
 661                 $$ = args;
 662           }
 663         | positional_argument_list COMMA expression
 664          {
 665                 ArrayList args = (ArrayList) $1;
 666                 args.Add (new Argument ((Expression) $3, Argument.AType.Expression));
 667
 668                 $$ = args;
 669          }
 670         ;
 671
 672 named_argument_list
 673         : named_argument
 674           {
 675                 ArrayList args = new ArrayList (4);
 676                 args.Add ($1);
 677
 678                 $$ = args;
 679           }
 680         | named_argument_list COMMA named_argument
 681           {
 682                 ArrayList args = (ArrayList) $1;
 683                 args.Add ($3);
 684
 685                 $$ = args;
 686           }
 687           | named_argument_list COMMA expression
 688             {
 689                   Report.Error (1016, ((Expression) $3).Location, "Named attribute argument expected");
 690                   $$ = null;
 691                 }
 692         ;
 693
 694 named_argument
 695         : IDENTIFIER ASSIGN expression
 696           {
 697                 // FIXME: keep location
 698                 $$ = new DictionaryEntry (
 699                         ((LocatedToken) $1).Value,
 700                         new Argument ((Expression) $3, Argument.AType.Expression));
 701           }
 702         ;
 703
 704
 705 class_body
 706         :  OPEN_BRACE opt_class_member_declarations CLOSE_BRACE
 707         ;
 708
 709 opt_class_member_declarations
 710         : /* empty */
 711         | class_member_declarations
 712         ;
 713
 714 class_member_declarations
 715         : class_member_declaration
 716         | class_member_declarations
 717           class_member_declaration
 718         ;
 719
 720 class_member_declaration
 721         : constant_declaration                  // done
 722         | field_declaration                     // done
 723         | method_declaration                    // done
 724         | property_declaration                  // done
 725         | event_declaration                     // done
 726         | indexer_declaration                   // done
 727         | operator_declaration                  // done
 728         | constructor_declaration               // done
 729         | destructor_declaration                // done
 730         | type_declaration
 731         ;
 732
 733 struct_declaration
 734         : opt_attributes
 735           opt_modifiers
 736           opt_partial
 737           STRUCT member_name
 738           {
 739                 MemberName name = MakeName ((MemberName) $5);
 740                 if ($3 != null) {
 741                         ClassPart part = PartialContainer.CreatePart (
 742                                 current_namespace, current_class, name, (int) $2,
 743                                 (Attributes) $1, Kind.Struct, (Location) $3);
 744
 745                         current_container = part.PartialContainer;
 746                         current_class = part;
 747                 } else {
 748                         current_class = new Struct (
 749                                 current_namespace, current_class, name, (int) $2,
 750                                 (Attributes) $1);
 751
 752                         current_container.AddClassOrStruct (current_class);
 753                         current_container = current_class;
 754                         RootContext.Tree.RecordDecl (current_namespace.NS, name, current_class);
 755                 }
 756           }
 757           opt_class_base
 758           {
 759                 if ($7 != null)
 760                         current_class.Bases = (ArrayList) $7;
 761
 762                 if (RootContext.Documentation != null)
 763                         current_class.DocComment = Lexer.consume_doc_comment ();
 764           }
 765           struct_body
 766           {
 767                 if (RootContext.Documentation != null)
 768                         Lexer.doc_state = XmlCommentState.Allowed;
 769           }
 770           opt_semicolon
 771           {
 772                 $$ = pop_current_class ();
 773           }
 774         | opt_attributes opt_modifiers opt_partial STRUCT error {
 775                 CheckIdentifierToken (yyToken, GetLocation ($5));
 776           }
 777         ;
 778
 779 struct_body
 780         : OPEN_BRACE
 781           {
 782                 if (RootContext.Documentation != null)
 783                         Lexer.doc_state = XmlCommentState.Allowed;
 784           }
 785           opt_struct_member_declarations CLOSE_BRACE
 786         ;
 787
 788 opt_struct_member_declarations
 789         : /* empty */
 790         | struct_member_declarations
 791         ;
 792
 793 struct_member_declarations
 794         : struct_member_declaration
 795         | struct_member_declarations struct_member_declaration
 796         ;
 797
 798 struct_member_declaration
 799         : constant_declaration
 800         | field_declaration
 801         | method_declaration
 802         | property_declaration
 803         | event_declaration
 804         | indexer_declaration
 805         | operator_declaration
 806         | constructor_declaration
 807         | type_declaration
 808
 809         /*
 810          * This is only included so we can flag error 575:
 811          * destructors only allowed on class types
 812          */
 813         | destructor_declaration
 814         ;
 815
 816 constant_declaration
 817         : opt_attributes
 818           opt_modifiers
 819           CONST
 820           type
 821           constant_declarators
 822           SEMICOLON
 823           {
 824                 int modflags = (int) $2;
 825                 foreach (VariableDeclaration constant in (ArrayList) $5){
 826                         Location l = constant.Location;
 827                         if ((modflags & Modifiers.STATIC) != 0) {
 828                                 Report.Error (504, l, "The constant `{0}' cannot be marked static", current_container.GetSignatureForError () + '.' + (string) constant.identifier);
 829                                 continue;
 830                         }
 831
 832                         Const c = new Const (
 833                                 current_class, (Expression) $4, (string) constant.identifier,
 834                                 (Expression) constant.expression_or_array_initializer, modflags,
 835                                 (Attributes) $1, l);
 836
 837                         if (RootContext.Documentation != null) {
 838                                 c.DocComment = Lexer.consume_doc_comment ();
 839                                 Lexer.doc_state = XmlCommentState.Allowed;
 840                         }
 841                         current_container.AddConstant (c);
 842                 }
 843           }
 844         ;
 845
 846 constant_declarators
 847         : constant_declarator
 848           {
 849                 ArrayList constants = new ArrayList (4);
 850                 if ($1 != null)
 851                         constants.Add ($1);
 852                 $$ = constants;
 853           }
 854         | constant_declarators COMMA constant_declarator
 855           {
 856                 if ($3 != null) {
 857                         ArrayList constants = (ArrayList) $1;
 858                         constants.Add ($3);
 859                 }
 860           }
 861         ;
 862
 863 constant_declarator
 864         : IDENTIFIER ASSIGN constant_expression
 865           {
 866                 $$ = new VariableDeclaration ((LocatedToken) $1, $3);
 867           }
 868         | IDENTIFIER
 869           {
 870                 // A const field requires a value to be provided
 871                 Report.Error (145, ((LocatedToken) $1).Location, "A const field requires a value to be provided");
 872                 $$ = null;
 873           }
 874         ;
 875
 876 field_declaration
 877         : opt_attributes
 878           opt_modifiers
 879           type
 880           variable_declarators
 881           SEMICOLON
 882           {
 883                 Expression type = (Expression) $3;
 884                 int mod = (int) $2;
 885
 886                 foreach (VariableDeclaration var in (ArrayList) $4){
 887                         Field field = new Field (current_class, type, mod, var.identifier,
 888                                                  var.expression_or_array_initializer,
 889                                                  (Attributes) $1, var.Location);
 890
 891                         if (RootContext.Documentation != null) {
 892                                 field.DocComment = Lexer.consume_doc_comment ();
 893                                 Lexer.doc_state = XmlCommentState.Allowed;
 894                         }
 895                         current_container.AddField (field);
 896                         $$ = field; // FIXME: might be better if it points to the top item
 897                 }
 898           }
 899         | opt_attributes
 900           opt_modifiers
 901           FIXED
 902           type
 903           fixed_variable_declarators
 904           SEMICOLON
 905           {
 906                         Expression type = (Expression) $4;
 907                         int mod = (int) $2;
 908
 909                         foreach (VariableDeclaration var in (ArrayList) $5) {
 910                                 FixedField field = new FixedField (current_class, type, mod, var.identifier,
 911                                         (Expression)var.expression_or_array_initializer, (Attributes) $1, var.Location);
 912
 913                                 if (RootContext.Documentation != null) {
 914                                         field.DocComment = Lexer.consume_doc_comment ();
 915                                         Lexer.doc_state = XmlCommentState.Allowed;
 916                                 }
 917                                 current_container.AddField (field);
 918                                 $$ = field; // FIXME: might be better if it points to the top item
 919                         }
 920           }
 921         | opt_attributes
 922           opt_modifiers
 923           VOID
 924           variable_declarators
 925           SEMICOLON {
 926                 Report.Error (670, (Location) $3, "Fields cannot have void type");
 927           }
 928         ;
 929
 930 fixed_variable_declarators
 931         : fixed_variable_declarator
 932           {
 933                 ArrayList decl = new ArrayList (2);
 934                 decl.Add ($1);
 935                 $$ = decl;
 936           }
 937         | fixed_variable_declarators COMMA fixed_variable_declarator
 938           {
 939                 ArrayList decls = (ArrayList) $1;
 940                 decls.Add ($3);
 941                 $$ = $1;
 942           }
 943         ;
 944
 945 fixed_variable_declarator
 946         : IDENTIFIER OPEN_BRACKET expression CLOSE_BRACKET
 947           {
 948                 $$ = new VariableDeclaration ((LocatedToken) $1, $3);
 949           }
 950         ;
 951
 952 variable_declarators
 953         : variable_declarator
 954           {
 955                 ArrayList decl = new ArrayList (4);
 956                 if ($1 != null)
 957                         decl.Add ($1);
 958                 $$ = decl;
 959           }
 960         | variable_declarators COMMA variable_declarator
 961           {
 962                 ArrayList decls = (ArrayList) $1;
 963                 decls.Add ($3);
 964                 $$ = $1;
 965           }
 966         ;
 967
 968 variable_declarator
 969         : IDENTIFIER ASSIGN variable_initializer
 970           {
 971                 $$ = new VariableDeclaration ((LocatedToken) $1, $3);
 972           }
 973         | IDENTIFIER
 974           {
 975                 $$ = new VariableDeclaration ((LocatedToken) $1, null);
 976           }
 977         | IDENTIFIER OPEN_BRACKET opt_expression CLOSE_BRACKET
 978           {
 979                 Report.Error (650, ((LocatedToken) $1).Location, "Syntax error, bad array declarator. To declare a managed array the rank specifier precedes the variable's identifier. " +
 980                         "To declare a fixed size buffer field, use the fixed keyword before the field type");
 981                 $$ = null;
 982           }
 983         ;
 984
 985 variable_initializer
 986         : expression
 987           {
 988                 $$ = $1;
 989           }
 990         | array_initializer
 991           {
 992                 $$ = $1;
 993           }
 994         | STACKALLOC type OPEN_BRACKET expression CLOSE_BRACKET
 995           {
 996                 $$ = new StackAlloc ((Expression) $2, (Expression) $4, (Location) $1);
 997           }
 998         | STACKALLOC type
 999           {
1000                 Report.Error (1575, (Location) $1, "A stackalloc expression requires [] after type");
1001                 $$ = null;
1002           }
1003         ;
1004
1005 method_declaration
1006         : method_header {
1007                 iterator_container = (IIteratorContainer) $1;
1008                 if (RootContext.Documentation != null)
1009                         Lexer.doc_state = XmlCommentState.NotAllowed;
1010           }
1011           method_body
1012           {
1013                 Method method = (Method) $1;
1014                 method.Block = (ToplevelBlock) $3;
1015                 current_container.AddMethod (method);
1016
1017                 current_local_parameters = null;
1018                 iterator_container = null;
1019
1020                 if (RootContext.Documentation != null)
1021                         Lexer.doc_state = XmlCommentState.Allowed;
1022           }
1023         ;
1024
1025 opt_error_modifier
1026         : /* empty */
1027         | modifiers
1028           {
1029                 int m = (int) $1;
1030                 int i = 1;
1031
1032                 while (m != 0){
1033                         if ((i & m) != 0){
1034                                 Report.Error (1585, lexer.Location,
1035                                         "Member modifier `{0}' must precede the member type and name",
1036                                         Modifiers.Name (i));
1037                         }
1038                         m &= ~i;
1039                         i = i << 1;
1040                 }
1041           }
1042         ;
1043
1044 method_header
1045         : opt_attributes
1046           opt_modifiers
1047           type namespace_or_type_name
1048           OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
1049           {
1050                 MemberName name = (MemberName) $4;
1051
1052                 Method method = new Method (current_class, (Expression) $3, (int) $2,
1053                                             false, name,  (Parameters) $6, (Attributes) $1);
1054
1055                 current_local_parameters = (Parameters) $6;
1056
1057                 if (RootContext.Documentation != null)
1058                         method.DocComment = Lexer.consume_doc_comment ();
1059
1060                 $$ = method;
1061           }
1062         | opt_attributes
1063           opt_modifiers
1064           VOID namespace_or_type_name
1065           OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
1066           {
1067                 MemberName name = (MemberName) $4;
1068
1069                 Method method = new Method (current_class, TypeManager.system_void_expr,
1070                                             (int) $2, false, name, (Parameters) $6,
1071                                             (Attributes) $1);
1072
1073                 current_local_parameters = (Parameters) $6;
1074
1075                 if (RootContext.Documentation != null)
1076                         method.DocComment = Lexer.consume_doc_comment ();
1077
1078                 $$ = method;
1079           }
1080         | opt_attributes
1081           opt_modifiers
1082           type
1083           modifiers namespace_or_type_name OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
1084           {
1085                 MemberName name = (MemberName) $5;
1086                 Report.Error (1585, name.Location,
1087                         "Member modifier `{0}' must precede the member type and name", Modifiers.Name ((int) $4));
1088
1089                 Method method = new Method (current_class, TypeManager.system_void_expr,
1090                                             0, false, name, (Parameters) $7, (Attributes) $1);
1091
1092                 current_local_parameters = (Parameters) $7;
1093
1094                 if (RootContext.Documentation != null)
1095                         method.DocComment = Lexer.consume_doc_comment ();
1096
1097                 $$ = null;
1098           }
1099         ;
1100
1101 method_body
1102         : block
1103         | SEMICOLON             { $$ = null; }
1104         ;
1105
1106 opt_formal_parameter_list
1107         : /* empty */                   { $$ = Parameters.EmptyReadOnlyParameters; }
1108         | formal_parameter_list
1109         ;
1110
1111 formal_parameter_list
1112         : fixed_parameters
1113           {
1114                 ArrayList pars_list = (ArrayList) $1;
1115
1116                 Parameter [] pars = new Parameter [pars_list.Count];
1117                 pars_list.CopyTo (pars);
1118
1119                 $$ = new Parameters (pars, null);
1120           }
1121         | fixed_parameters COMMA parameter_array
1122           {
1123                 ArrayList pars_list = (ArrayList) $1;
1124
1125                 Parameter [] pars = new Parameter [pars_list.Count];
1126                 pars_list.CopyTo (pars);
1127
1128                 $$ = new Parameters (pars, (Parameter) $3);
1129           }
1130         | fixed_parameters COMMA ARGLIST
1131           {
1132                 ArrayList pars_list = (ArrayList) $1;
1133
1134                 Parameter [] pars = new Parameter [pars_list.Count];
1135                 pars_list.CopyTo (pars);
1136
1137                 $$ = new Parameters (pars, true);
1138           }
1139         | parameter_array COMMA fixed_parameters
1140           {
1141                 if ($1 != null)
1142                         Report.Error (231, ((Parameter) $1).Location, "A params parameter must be the last parameter in a formal parameter list");
1143                 $$ = null;
1144           }
1145         | ARGLIST COMMA fixed_parameters
1146           {
1147                 Report.Error (257, (Location) $1, "An __arglist parameter must be the last parameter in a formal parameter list");
1148                 $$ = null;
1149           }
1150         | parameter_array
1151           {
1152                 $$ = new Parameters (null, (Parameter) $1);
1153           }
1154         | ARGLIST
1155           {
1156                 $$ = new Parameters (null, true);
1157           }
1158         ;
1159
1160 fixed_parameters
1161         : fixed_parameter
1162           {
1163                 ArrayList pars = new ArrayList (4);
1164
1165                 pars.Add ($1);
1166                 $$ = pars;
1167           }
1168         | fixed_parameters COMMA fixed_parameter
1169           {
1170                 ArrayList pars = (ArrayList) $1;
1171
1172                 pars.Add ($3);
1173                 $$ = $1;
1174           }
1175         ;
1176
1177 fixed_parameter
1178         : opt_attributes
1179           opt_parameter_modifier
1180           type
1181           IDENTIFIER
1182           {
1183                 LocatedToken lt = (LocatedToken) $4;
1184                 $$ = new Parameter ((Expression) $3, lt.Value, (Parameter.Modifier) $2, (Attributes) $1, lt.Location);
1185           }
1186         | opt_attributes
1187           opt_parameter_modifier
1188           type
1189           IDENTIFIER OPEN_BRACKET CLOSE_BRACKET
1190           {
1191                 LocatedToken lt = (LocatedToken) $4;
1192                 Report.Error (1552, lt.Location, "Array type specifier, [], must appear before parameter name");
1193                 $$ = null;
1194           }
1195         | opt_attributes
1196           opt_parameter_modifier
1197           type
1198           {
1199                 Report.Error (1001, GetLocation ($3), "Identifier expected");
1200                 $$ = null;
1201           }
1202         | opt_attributes
1203           opt_parameter_modifier
1204           type
1205           error {
1206                 CheckIdentifierToken (yyToken, GetLocation ($4));
1207                 $$ = null;
1208           }
1209         | opt_attributes
1210           opt_parameter_modifier
1211           type
1212           IDENTIFIER
1213           ASSIGN
1214           constant_expression
1215            {
1216                 LocatedToken lt = (LocatedToken) $4;
1217                 Report.Error (241, lt.Location, "Default parameter specifiers are not permitted");
1218                  $$ = null;
1219            }
1220         ;
1221
1222 opt_parameter_modifier
1223         : /* empty */           { $$ = Parameter.Modifier.NONE; }
1224         | parameter_modifier
1225         ;
1226
1227 parameter_modifier
1228         : REF                   { $$ = Parameter.Modifier.REF | Parameter.Modifier.ISBYREF; }
1229         | OUT                   { $$ = Parameter.Modifier.OUT | Parameter.Modifier.ISBYREF; }
1230         ;
1231
1232 parameter_array
1233         : opt_attributes PARAMS type IDENTIFIER
1234           {
1235                 LocatedToken lt = (LocatedToken) $4;
1236                 $$ = new Parameter ((Expression) $3, lt.Value, Parameter.Modifier.PARAMS, (Attributes) $1, lt.Location);
1237                 note ("type must be a single-dimension array type");
1238           }
1239         | opt_attributes PARAMS parameter_modifier type IDENTIFIER
1240           {
1241                 Report.Error (1611, (Location) $2, "The params parameter cannot be declared as ref or out");
1242                 $$ = null;
1243           }
1244         | opt_attributes PARAMS type error {
1245                 CheckIdentifierToken (yyToken, GetLocation ($4));
1246                 $$ = null;
1247           }
1248         ;
1249
1250 property_declaration
1251         : opt_attributes
1252           opt_modifiers
1253           type
1254           namespace_or_type_name
1255           {
1256                 if (RootContext.Documentation != null)
1257                         tmpComment = Lexer.consume_doc_comment ();
1258           }
1259           OPEN_BRACE
1260           {
1261                 implicit_value_parameter_type = (Expression) $3;
1262
1263                 lexer.PropertyParsing = true;
1264           }
1265           accessor_declarations
1266           {
1267                 lexer.PropertyParsing = false;
1268                 has_get = has_set = false;
1269           }
1270           CLOSE_BRACE
1271           {
1272                 if ($8 == null)
1273                         break;
1274
1275                 Property prop;
1276                 Pair pair = (Pair) $8;
1277                 Accessor get_block = (Accessor) pair.First;
1278                 Accessor set_block = (Accessor) pair.Second;
1279
1280                 MemberName name = (MemberName) $4;
1281
1282                 prop = new Property (current_class, (Expression) $3, (int) $2,
1283                         false, name, (Attributes) $1, get_block, set_block);
1284
1285                 current_container.AddProperty (prop);
1286                 implicit_value_parameter_type = null;
1287
1288                 if (RootContext.Documentation != null)
1289                         prop.DocComment = ConsumeStoredComment ();
1290
1291           }
1292         ;
1293
1294 accessor_declarations
1295         : get_accessor_declaration
1296          {
1297                 $$ = new Pair ($1, null);
1298          }
1299         | get_accessor_declaration accessor_declarations
1300          {
1301                 Pair pair = (Pair) $2;
1302                 pair.First = $1;
1303                 $$ = pair;
1304          }
1305         | set_accessor_declaration
1306          {
1307                 $$ = new Pair (null, $1);
1308          }
1309         | set_accessor_declaration accessor_declarations
1310          {
1311                 Pair pair = (Pair) $2;
1312                 pair.Second = $1;
1313                 $$ = pair;
1314          }
1315         | error
1316           {
1317                 Report.Error (1014, GetLocation ($1), "A get or set accessor expected");
1318                 $$ = null;
1319           }
1320         ;
1321
1322 get_accessor_declaration
1323         : opt_attributes opt_modifiers GET
1324           {
1325                 // If this is not the case, then current_local_parameters has already
1326                 // been set in indexer_declaration
1327                 if (parsing_indexer == false)
1328                         current_local_parameters = null;
1329                 else
1330                         current_local_parameters = indexer_parameters;
1331                 lexer.PropertyParsing = false;
1332
1333                 iterator_container = SimpleIteratorContainer.GetSimple ();
1334           }
1335           accessor_body
1336           {
1337                 if (has_get) {
1338                         Report.Error (1007, (Location) $3, "Property accessor already defined");
1339                         break;
1340                 }
1341                 Accessor accessor = new Accessor ((ToplevelBlock) $5, (int) $2, (Attributes) $1, (Location) $3);
1342                 has_get = true;
1343                 current_local_parameters = null;
1344                 lexer.PropertyParsing = true;
1345
1346                 if (SimpleIteratorContainer.Simple.Yields)
1347                         accessor.SetYields ();
1348
1349                 iterator_container = null;
1350
1351                 if (RootContext.Documentation != null)
1352                         if (Lexer.doc_state == XmlCommentState.Error)
1353                                 Lexer.doc_state = XmlCommentState.NotAllowed;
1354
1355                 $$ = accessor;
1356           }
1357         ;
1358
1359 set_accessor_declaration
1360         : opt_attributes opt_modifiers SET
1361           {
1362                 Parameter [] args;
1363                 Parameter implicit_value_parameter = new Parameter (
1364                         implicit_value_parameter_type, "value",
1365                         Parameter.Modifier.NONE, null, (Location) $3);
1366
1367                 if (parsing_indexer == false) {
1368                         args  = new Parameter [1];
1369                         args [0] = implicit_value_parameter;
1370                         current_local_parameters = new Parameters (args, null);
1371                 } else {
1372                         Parameter [] fpars = indexer_parameters.FixedParameters;
1373
1374                         if (fpars != null){
1375                                 int count = fpars.Length;
1376
1377                                 args = new Parameter [count + 1];
1378                                 fpars.CopyTo (args, 0);
1379                                 args [count] = implicit_value_parameter;
1380                         } else
1381                                 args = null;
1382                         current_local_parameters = new Parameters (
1383                                 args, indexer_parameters.ArrayParameter);
1384                 }
1385
1386                 lexer.PropertyParsing = false;
1387
1388                 iterator_container = SimpleIteratorContainer.GetSimple ();
1389           }
1390           accessor_body
1391           {
1392                 if (has_set) {
1393                         Report.Error (1007, ((LocatedToken) $3).Location, "Property accessor already defined");
1394                         break;
1395                 }
1396                 Accessor accessor = new Accessor ((ToplevelBlock) $5, (int) $2, (Attributes) $1, (Location) $3);
1397                 has_set = true;
1398                 current_local_parameters = null;
1399                 lexer.PropertyParsing = true;
1400
1401                 if (SimpleIteratorContainer.Simple.Yields)
1402                         accessor.SetYields ();
1403
1404                 iterator_container = null;
1405
1406                 if (RootContext.Documentation != null
1407                         && Lexer.doc_state == XmlCommentState.Error)
1408                         Lexer.doc_state = XmlCommentState.NotAllowed;
1409
1410                 $$ = accessor;
1411           }
1412         ;
1413
1414 accessor_body
1415         : block
1416         | SEMICOLON             { $$ = null; }
1417         ;
1418
1419 interface_declaration
1420         : opt_attributes
1421           opt_modifiers
1422           opt_partial
1423           INTERFACE member_name
1424           {
1425                 MemberName name = MakeName ((MemberName) $5);
1426
1427                 if ($3 != null) {
1428                         ClassPart part = PartialContainer.CreatePart (
1429                                 current_namespace, current_class, name, (int) $2,
1430                                 (Attributes) $1, Kind.Interface, (Location) $3);
1431
1432                         current_container = part.PartialContainer;
1433                         current_class = part;
1434                 } else {
1435                         current_class = new Interface (
1436                                 current_namespace, current_class, name, (int) $2,
1437                                 (Attributes) $1);
1438
1439                         current_container.AddInterface (current_class);
1440                         current_container = current_class;
1441                         RootContext.Tree.RecordDecl (current_namespace.NS, name, current_class);
1442                 }
1443           }
1444           opt_class_base
1445           {
1446                 current_class.Bases = (ArrayList) $7;
1447
1448                 if (RootContext.Documentation != null) {
1449                         current_class.DocComment = Lexer.consume_doc_comment ();
1450                         Lexer.doc_state = XmlCommentState.Allowed;
1451                 }
1452           }
1453           interface_body
1454           {
1455                 if (RootContext.Documentation != null)
1456                         Lexer.doc_state = XmlCommentState.Allowed;
1457           }
1458           opt_semicolon
1459           {
1460                 $$ = pop_current_class ();
1461           }
1462         | opt_attributes opt_modifiers opt_partial INTERFACE error {
1463                 CheckIdentifierToken (yyToken, GetLocation ($5));
1464           }
1465         ;
1466
1467 interface_body
1468         : OPEN_BRACE
1469           opt_interface_member_declarations
1470           CLOSE_BRACE
1471         ;
1472
1473 opt_interface_member_declarations
1474         : /* empty */
1475         | interface_member_declarations
1476         ;
1477
1478 interface_member_declarations
1479         : interface_member_declaration
1480         | interface_member_declarations interface_member_declaration
1481         ;
1482
1483 interface_member_declaration
1484         : interface_method_declaration
1485           {
1486                 if ($1 == null)
1487                         break;
1488
1489                 Method m = (Method) $1;
1490
1491                 if (m.IsExplicitImpl)
1492                         Report.Error (541, m.Location, "`{0}': explicit interface declaration can only be declared in a class or struct",
1493                                 m.GetSignatureForError ());
1494
1495                 current_container.AddMethod (m);
1496
1497                 if (RootContext.Documentation != null)
1498                         Lexer.doc_state = XmlCommentState.Allowed;
1499           }
1500         | interface_property_declaration
1501           {
1502                 if ($1 == null)
1503                         break;
1504
1505                 Property p = (Property) $1;
1506
1507                 if (p.IsExplicitImpl)
1508                         Report.Error (541, p.Location, "`{0}': explicit interface declaration can only be declared in a class or struct",
1509                                 p.GetSignatureForError ());
1510
1511                 current_container.AddProperty (p);
1512
1513                 if (RootContext.Documentation != null)
1514                         Lexer.doc_state = XmlCommentState.Allowed;
1515        }
1516         | interface_event_declaration
1517           {
1518                 if ($1 != null){
1519                         Event e = (Event) $1;
1520
1521                         if (e.IsExplicitImpl)
1522                         Report.Error (541, e.Location, "`{0}': explicit interface declaration can only be declared in a class or struct",
1523                                 e.GetSignatureForError ());
1524
1525                         current_container.AddEvent (e);
1526                 }
1527
1528                 if (RootContext.Documentation != null)
1529                         Lexer.doc_state = XmlCommentState.Allowed;
1530           }
1531         | interface_indexer_declaration
1532           {
1533                 if ($1 == null)
1534                         break;
1535
1536                 Indexer i = (Indexer) $1;
1537
1538                 if (i.IsExplicitImpl)
1539                         Report.Error (541, i.Location, "`{0}': explicit interface declaration can only be declared in a class or struct",
1540                                 i.GetSignatureForError ());
1541
1542                 current_container.AddIndexer (i);
1543
1544                 if (RootContext.Documentation != null)
1545                         Lexer.doc_state = XmlCommentState.Allowed;
1546           }
1547         | delegate_declaration
1548           {
1549                 if ($1 != null) {
1550                         Report.Error (524, GetLocation ($1), "`{0}': Interfaces cannot declare classes, structs, interfaces, delegates, enumerations or constants",
1551                                 ((MemberCore)$1).GetSignatureForError ());
1552                 }
1553           }
1554         | class_declaration
1555           {
1556                 if ($1 != null) {
1557                         Report.Error (524, GetLocation ($1), "`{0}': Interfaces cannot declare classes, structs, interfaces, delegates, enumerations or constants",
1558                                 ((MemberCore)$1).GetSignatureForError ());
1559                 }
1560           }
1561         | struct_declaration
1562           {
1563                 if ($1 != null) {
1564                         Report.Error (524, GetLocation ($1), "`{0}': Interfaces cannot declare classes, structs, interfaces, delegates, enumerations or constants",
1565                                 ((MemberCore)$1).GetSignatureForError ());
1566                 }
1567           }
1568         | enum_declaration
1569           {
1570                 if ($1 != null) {
1571                         Report.Error (524, GetLocation ($1), "`{0}': Interfaces cannot declare classes, structs, interfaces, delegates, enumerations or constants",
1572                                 ((MemberCore)$1).GetSignatureForError ());
1573                 }
1574           }
1575         | interface_declaration
1576           {
1577                 if ($1 != null) {
1578                         Report.Error (524, GetLocation ($1), "`{0}': Interfaces cannot declare classes, structs, interfaces, delegates, enumerations or constants",
1579                                 ((MemberCore)$1).GetSignatureForError ());
1580                 }
1581           }
1582         | constant_declaration
1583           {
1584                 Report.Error (525, GetLocation ($1), "Interfaces cannot contain fields or constants");
1585           }
1586         ;
1587
1588 opt_new
1589         : opt_modifiers
1590           {
1591                 int val = (int) $1;
1592                 val = Modifiers.Check (Modifiers.NEW | Modifiers.UNSAFE, val, 0, GetLocation ($1));
1593                 $$ = val;
1594           }
1595         ;
1596
1597 interface_method_declaration
1598         : opt_attributes opt_new type namespace_or_type_name
1599           OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
1600           SEMICOLON
1601           {
1602                 $$ = new Method (current_class, (Expression) $3, (int) $2, true,
1603                                  (MemberName) $4, (Parameters) $6, (Attributes) $1);
1604                 if (RootContext.Documentation != null)
1605                         ((Method) $$).DocComment = Lexer.consume_doc_comment ();
1606           }
1607         | opt_attributes opt_new type namespace_or_type_name
1608           OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
1609           OPEN_BRACE opt_statement_list CLOSE_BRACE
1610           {
1611                 $$ = new Method (current_class, (Expression) $3, (int) $2, true,
1612                                  (MemberName) $4, (Parameters) $6, (Attributes) $1);
1613
1614                 Report.Error (531, lexer.Location, "`{0}': interface members cannot have a definition",
1615                         ((Method)$$).GetSignatureForError ());
1616           }
1617         ;
1618
1619 interface_property_declaration
1620         : opt_attributes
1621           opt_new
1622           type IDENTIFIER
1623           OPEN_BRACE
1624           { lexer.PropertyParsing = true; }
1625           interface_accessors
1626           { lexer.PropertyParsing = false; }
1627           CLOSE_BRACE
1628           {
1629                 LocatedToken lt = (LocatedToken) $4;
1630                 MemberName name = new MemberName (lt.Value, lt.Location);
1631
1632                 if ($3 == TypeManager.system_void_expr) {
1633                         Report.Error (547, lt.Location, "`{0}': property or indexer cannot have void type", lt.Value);
1634                         break;
1635                 }
1636
1637                 if ($7 == null) {
1638                         Property p = new Property (current_class, (Expression) $3, (int) $2, true,
1639                                    name, (Attributes) $1,
1640                                    null, null);
1641
1642                         Report.Error (548, lexer.Location, "`{0}': property or indexer must have at least one accessor", p.GetSignatureForError ());
1643                         break;
1644                 }
1645
1646                 InterfaceAccessorInfo pinfo = (InterfaceAccessorInfo) $7;
1647
1648                 $$ = new Property (current_class, (Expression) $3, (int) $2, true,
1649                                    name, (Attributes) $1,
1650                                    pinfo.Get, pinfo.Set);
1651                 if (RootContext.Documentation != null)
1652                         ((Property) $$).DocComment = Lexer.consume_doc_comment ();
1653           }
1654         | opt_attributes
1655           opt_new
1656           type error {
1657                 CheckIdentifierToken (yyToken, GetLocation ($4));
1658                 $$ = null;
1659           }
1660         ;
1661
1662 interface_accessors
1663         : opt_attributes opt_modifiers GET SEMICOLON
1664           {
1665                 $$ = new InterfaceAccessorInfo (true, false, (Attributes) $1, null, (int) $2, 0, (Location) $3, (Location) $3);
1666           }
1667         | opt_attributes opt_modifiers GET OPEN_BRACE
1668           {
1669                 Report.Error (531, (Location) $3, "`{0}': interface members cannot have a definition", ".get");
1670                 $$ = new InterfaceAccessorInfo (true, false, (Attributes) $1, null, (int) $2, 0, (Location) $3, (Location) $3);
1671           }
1672         | opt_attributes opt_modifiers SET SEMICOLON
1673           {
1674                 $$ = new InterfaceAccessorInfo (false, true, null, (Attributes) $1, 0, (int) $2, (Location) $3, (Location) $3);
1675           }
1676         | opt_attributes opt_modifiers GET SEMICOLON opt_attributes opt_modifiers SET SEMICOLON
1677           {
1678                 $$ = new InterfaceAccessorInfo (true, true, (Attributes) $1, (Attributes) $5, (int) $2, (int) $6, (Location) $3, (Location) $7);
1679           }
1680         | opt_attributes opt_modifiers SET SEMICOLON opt_attributes opt_modifiers GET SEMICOLON
1681           {
1682                 $$ = new InterfaceAccessorInfo (true, true, (Attributes) $5, (Attributes) $1, (int) $6, (int) $2, (Location) $3, (Location) $3);
1683           }
1684         |
1685           {
1686                 $$ = null;
1687           }
1688         ;
1689
1690 interface_event_declaration
1691         : opt_attributes opt_new EVENT type IDENTIFIER SEMICOLON
1692           {
1693                 LocatedToken lt = (LocatedToken) $5;
1694                 $$ = new EventField (current_class, (Expression) $4, (int) $2, true,
1695                                      new MemberName (lt.Value, lt.Location), null,
1696                                      (Attributes) $1);
1697                 if (RootContext.Documentation != null)
1698                         ((EventField) $$).DocComment = Lexer.consume_doc_comment ();
1699           }
1700         | opt_attributes opt_new EVENT type error {
1701                 CheckIdentifierToken (yyToken, GetLocation ($5));
1702                 $$ = null;
1703           }
1704         | opt_attributes opt_new EVENT type IDENTIFIER ASSIGN  {
1705                 LocatedToken lt = (LocatedToken) $5;
1706                 Report.Error (68, lt.Location, "`{0}.{1}': event in interface cannot have initializer", current_container.Name, lt.Value);
1707                 $$ = null;
1708           }
1709         | opt_attributes opt_new EVENT type IDENTIFIER OPEN_BRACE
1710           {
1711                 lexer.EventParsing = true;
1712           }
1713           event_accessor_declarations
1714           {
1715                 lexer.EventParsing = false;
1716           }
1717           CLOSE_BRACE {
1718                 Report.Error (69, (Location) $3, "Event in interface cannot have add or remove accessors");
1719                 $$ = null;
1720           }
1721         ;
1722
1723 interface_indexer_declaration
1724         : opt_attributes opt_new type THIS
1725           OPEN_BRACKET formal_parameter_list CLOSE_BRACKET
1726           OPEN_BRACE
1727           { lexer.PropertyParsing = true; }
1728           interface_accessors
1729           { lexer.PropertyParsing = false; }
1730           CLOSE_BRACE
1731           {
1732                 if ($10 == null) {
1733                         Indexer i = new Indexer (current_class, (Expression) $3,
1734                                   new MemberName (TypeContainer.DefaultIndexerName),
1735                                   (int) $2, true, (Parameters) $6, (Attributes) $1,
1736                                   null, null);
1737
1738                         Report.Error (548, lexer.Location, "`{0}': property or indexer must have at least one accessor", i.GetSignatureForError ());
1739                         break;
1740                 }
1741
1742                 InterfaceAccessorInfo info = (InterfaceAccessorInfo) $10;
1743
1744                 $$ = new Indexer (current_class, (Expression) $3,
1745                                   new MemberName (TypeContainer.DefaultIndexerName, (Location) $4),
1746                                   (int) $2, true, (Parameters) $6, (Attributes) $1,
1747                                   info.Get, info.Set);
1748                 if (RootContext.Documentation != null)
1749                         ((Indexer) $$).DocComment = ConsumeStoredComment ();
1750           }
1751         ;
1752
1753 operator_declaration
1754         : opt_attributes opt_modifiers operator_declarator
1755           {
1756                 iterator_container = SimpleIteratorContainer.GetSimple ();
1757           }
1758           operator_body
1759           {
1760                 if ($3 == null)
1761                         break;
1762
1763                 OperatorDeclaration decl = (OperatorDeclaration) $3;
1764
1765                 Parameter [] param_list = new Parameter [decl.arg2type != null ? 2 : 1];
1766
1767                 param_list[0] = new Parameter (decl.arg1type, decl.arg1name, Parameter.Modifier.NONE, null, decl.location);
1768                 if (decl.arg2type != null)
1769                         param_list[1] = new Parameter (decl.arg2type, decl.arg2name, Parameter.Modifier.NONE, null, decl.location);
1770
1771                 Operator op = new Operator (
1772                         current_class, decl.optype, decl.ret_type, (int) $2,
1773                         new Parameters (param_list, null),
1774                         (ToplevelBlock) $5, (Attributes) $1, decl.location);
1775
1776                 if (RootContext.Documentation != null) {
1777                         op.DocComment = tmpComment;
1778                         Lexer.doc_state = XmlCommentState.Allowed;
1779                 }
1780
1781                 if (SimpleIteratorContainer.Simple.Yields)
1782                         op.SetYields ();
1783
1784                 // Note again, checking is done in semantic analysis
1785                 current_container.AddOperator (op);
1786
1787                 current_local_parameters = null;
1788                 iterator_container = null;
1789           }
1790         ;
1791
1792 operator_body
1793         : block
1794         | SEMICOLON { $$ = null; }
1795         ;
1796 operator_declarator
1797         : type OPERATOR overloadable_operator
1798           OPEN_PARENS type IDENTIFIER CLOSE_PARENS
1799           {
1800                 LocatedToken lt = (LocatedToken) $6;
1801                 Operator.OpType op = (Operator.OpType) $3;
1802                 CheckUnaryOperator (op, lt.Location);
1803
1804                 if (op == Operator.OpType.Addition)
1805                         op = Operator.OpType.UnaryPlus;
1806
1807                 if (op == Operator.OpType.Subtraction)
1808                         op = Operator.OpType.UnaryNegation;
1809
1810                 Parameter [] pars = new Parameter [1];
1811                 Expression type = (Expression) $5;
1812
1813                 pars [0] = new Parameter (type, lt.Value, Parameter.Modifier.NONE, null, lt.Location);
1814
1815                 current_local_parameters = new Parameters (pars, null);
1816
1817                 if (RootContext.Documentation != null) {
1818                         tmpComment = Lexer.consume_doc_comment ();
1819                         Lexer.doc_state = XmlCommentState.NotAllowed;
1820                 }
1821
1822                 $$ = new OperatorDeclaration (op, (Expression) $1, type, lt.Value,
1823                                               null, null, (Location) $2);
1824           }
1825         | type OPERATOR overloadable_operator
1826           OPEN_PARENS
1827                 type IDENTIFIER COMMA
1828                 type IDENTIFIER
1829           CLOSE_PARENS
1830           {
1831                 LocatedToken ltParam1 = (LocatedToken) $6;
1832                 LocatedToken ltParam2 = (LocatedToken) $9;
1833                 CheckBinaryOperator ((Operator.OpType) $3, (Location) $2);
1834
1835                 Parameter [] pars = new Parameter [2];
1836
1837                 Expression typeL = (Expression) $5;
1838                 Expression typeR = (Expression) $8;
1839
1840                pars [0] = new Parameter (typeL, ltParam1.Value, Parameter.Modifier.NONE, null, ltParam1.Location);
1841                pars [1] = new Parameter (typeR, ltParam2.Value, Parameter.Modifier.NONE, null, ltParam2.Location);
1842
1843                current_local_parameters = new Parameters (pars, null);
1844
1845                 if (RootContext.Documentation != null) {
1846                         tmpComment = Lexer.consume_doc_comment ();
1847                         Lexer.doc_state = XmlCommentState.NotAllowed;
1848                 }
1849
1850                $$ = new OperatorDeclaration ((Operator.OpType) $3, (Expression) $1,
1851                                              typeL, ltParam1.Value,
1852                                              typeR, ltParam2.Value, (Location) $2);
1853           }
1854         | conversion_operator_declarator
1855         | type OPERATOR overloadable_operator
1856           OPEN_PARENS
1857                 type IDENTIFIER COMMA
1858                 type IDENTIFIER COMMA
1859                 type IDENTIFIER
1860           CLOSE_PARENS
1861           {
1862                 Report.Error (1534, (Location) $2, "Overloaded binary operator `{0}' takes two parameters",
1863                         Operator.GetName ((Operator.OpType) $3));
1864                 $$ = null;
1865           }
1866         | type OPERATOR overloadable_operator
1867           OPEN_PARENS CLOSE_PARENS
1868           {
1869                 Report.Error (1535, (Location) $2, "Overloaded unary operator `{0}' takes one parameter",
1870                         Operator.GetName ((Operator.OpType) $3));
1871                 $$ = null;
1872           }
1873         ;
1874
1875 overloadable_operator
1876 // Unary operators:
1877         : BANG   { $$ = Operator.OpType.LogicalNot; }
1878         | TILDE  { $$ = Operator.OpType.OnesComplement; }
1879         | OP_INC { $$ = Operator.OpType.Increment; }
1880         | OP_DEC { $$ = Operator.OpType.Decrement; }
1881         | TRUE   { $$ = Operator.OpType.True; }
1882         | FALSE  { $$ = Operator.OpType.False; }
1883 // Unary and binary:
1884         | PLUS { $$ = Operator.OpType.Addition; }
1885         | MINUS { $$ = Operator.OpType.Subtraction; }
1886 // Binary:
1887         | STAR { $$ = Operator.OpType.Multiply; }
1888         | DIV {  $$ = Operator.OpType.Division; }
1889         | PERCENT { $$ = Operator.OpType.Modulus; }
1890         | BITWISE_AND { $$ = Operator.OpType.BitwiseAnd; }
1891         | BITWISE_OR { $$ = Operator.OpType.BitwiseOr; }
1892         | CARRET { $$ = Operator.OpType.ExclusiveOr; }
1893         | OP_SHIFT_LEFT { $$ = Operator.OpType.LeftShift; }
1894         | OP_SHIFT_RIGHT { $$ = Operator.OpType.RightShift; }
1895         | OP_EQ { $$ = Operator.OpType.Equality; }
1896         | OP_NE { $$ = Operator.OpType.Inequality; }
1897         | OP_GT { $$ = Operator.OpType.GreaterThan; }
1898         | OP_LT { $$ = Operator.OpType.LessThan; }
1899         | OP_GE { $$ = Operator.OpType.GreaterThanOrEqual; }
1900         | OP_LE { $$ = Operator.OpType.LessThanOrEqual; }
1901         ;
1902
1903 conversion_operator_declarator
1904         : IMPLICIT OPERATOR type OPEN_PARENS type IDENTIFIER CLOSE_PARENS
1905           {
1906                 LocatedToken lt = (LocatedToken) $6;
1907                 Parameter [] pars = new Parameter [1];
1908
1909                 pars [0] = new Parameter ((Expression) $5, lt.Value, Parameter.Modifier.NONE, null, lt.Location);
1910
1911                 current_local_parameters = new Parameters (pars, null);
1912
1913                 if (RootContext.Documentation != null) {
1914                         tmpComment = Lexer.consume_doc_comment ();
1915                         Lexer.doc_state = XmlCommentState.NotAllowed;
1916                 }
1917
1918                 $$ = new OperatorDeclaration (Operator.OpType.Implicit, (Expression) $3, (Expression) $5, lt.Value,
1919                                               null, null, (Location) $2);
1920           }
1921         | EXPLICIT OPERATOR type OPEN_PARENS type IDENTIFIER CLOSE_PARENS
1922           {
1923                 LocatedToken lt = (LocatedToken) $6;
1924                 Parameter [] pars = new Parameter [1];
1925
1926                 pars [0] = new Parameter ((Expression) $5, lt.Value, Parameter.Modifier.NONE, null, lt.Location);
1927
1928                 current_local_parameters = new Parameters (pars, null);
1929
1930                 if (RootContext.Documentation != null) {
1931                         tmpComment = Lexer.consume_doc_comment ();
1932                         Lexer.doc_state = XmlCommentState.NotAllowed;
1933                 }
1934
1935                 $$ = new OperatorDeclaration (Operator.OpType.Explicit, (Expression) $3, (Expression) $5, lt.Value,
1936                                               null, null, (Location) $2);
1937           }
1938         | IMPLICIT error
1939           {
1940                 syntax_error ((Location) $1, "'operator' expected");
1941           }
1942         | EXPLICIT error
1943           {
1944                 syntax_error ((Location) $1, "'operator' expected");
1945           }
1946         ;
1947
1948 constructor_declaration
1949         : opt_attributes
1950           opt_modifiers
1951           constructor_declarator
1952           constructor_body
1953           {
1954                 Constructor c = (Constructor) $3;
1955                 c.Block = (ToplevelBlock) $4;
1956                 c.OptAttributes = (Attributes) $1;
1957                 c.ModFlags = (int) $2;
1958
1959                 if (RootContext.Documentation != null)
1960                         c.DocComment = ConsumeStoredComment ();
1961
1962                 if (c.Name == current_container.Basename){
1963                         if ((c.ModFlags & Modifiers.STATIC) != 0){
1964                                 if ((c.ModFlags & Modifiers.Accessibility) != 0){
1965                                         Report.Error (515, c.Location,
1966                                                 "`{0}': access modifiers are not allowed on static constructors",
1967                                                 c.GetSignatureForError ());
1968                                 }
1969
1970                                 c.ModFlags = Modifiers.Check (Constructor.AllowedModifiers, (int) $2, Modifiers.PRIVATE, c.Location);
1971
1972                                 if (c.Initializer != null){
1973                                         Report.Error (514, c.Location,
1974                                                 "`{0}': static constructor cannot have an explicit `this' or `base' constructor call",
1975                                                 c.GetSignatureForError ());
1976                                 }
1977
1978                                 if (!c.Parameters.Empty){
1979                                         Report.Error (132, c.Location,
1980                                                 "`{0}': The static constructor must be parameterless", c.GetSignatureForError ());
1981                                 }
1982                         } else {
1983                                 c.ModFlags = Modifiers.Check (Constructor.AllowedModifiers, (int) $2, Modifiers.PRIVATE, c.Location);
1984                         }
1985                 } else {
1986                         // We let another layer check the validity of the constructor.
1987                         //Console.WriteLine ("{0} and {1}", c.Name, current_container.Basename);
1988                 }
1989
1990                 current_container.AddConstructor (c);
1991
1992                 current_local_parameters = null;
1993                 if (RootContext.Documentation != null)
1994                         Lexer.doc_state = XmlCommentState.Allowed;
1995           }
1996         ;
1997
1998 constructor_declarator
1999         : IDENTIFIER
2000           {
2001                 if (RootContext.Documentation != null) {
2002                         tmpComment = Lexer.consume_doc_comment ();
2003                         Lexer.doc_state = XmlCommentState.Allowed;
2004                 }
2005           }
2006           OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
2007           {
2008                 current_local_parameters = (Parameters) $4;
2009           }
2010           opt_constructor_initializer
2011           {
2012                 LocatedToken lt = (LocatedToken) $1;
2013                 $$ = new Constructor (current_class, lt.Value, 0, (Parameters) $4,
2014                                       (ConstructorInitializer) $7, lt.Location);
2015           }
2016         ;
2017
2018 constructor_body
2019         : block
2020         | SEMICOLON             { $$ = null; }
2021         ;
2022
2023 opt_constructor_initializer
2024         : /* empty */                   { $$ = null; }
2025         | constructor_initializer
2026         ;
2027
2028 constructor_initializer
2029         : COLON BASE OPEN_PARENS opt_argument_list CLOSE_PARENS
2030           {
2031                 $$ = new ConstructorBaseInitializer ((ArrayList) $4, (Location) $2);
2032           }
2033         | COLON THIS OPEN_PARENS opt_argument_list CLOSE_PARENS
2034           {
2035                 $$ = new ConstructorThisInitializer ((ArrayList) $4, (Location) $2);
2036           }
2037         | COLON error {
2038                 Report.Error (1018, (Location) $1, "Keyword this or base expected");
2039                 $$ = null;
2040           }
2041         ;
2042
2043 opt_finalizer
2044         : /* EMPTY */           { $$ = 0; }
2045         | UNSAFE                { $$ = Modifiers.UNSAFE; }
2046         | EXTERN                { $$ = Modifiers.EXTERN; }
2047         ;
2048
2049 destructor_declaration
2050         : opt_attributes opt_finalizer TILDE
2051           {
2052                 if (RootContext.Documentation != null) {
2053                         tmpComment = Lexer.consume_doc_comment ();
2054                         Lexer.doc_state = XmlCommentState.NotAllowed;
2055                 }
2056           }
2057           IDENTIFIER OPEN_PARENS CLOSE_PARENS block
2058           {
2059                 LocatedToken lt = (LocatedToken) $5;
2060                 if (lt.Value != current_container.Basename){
2061                         Report.Error (574, lt.Location, "Name of destructor must match name of class");
2062                 } else if (current_container.Kind != Kind.Class){
2063                         Report.Error (575, lt.Location, "Only class types can contain destructor");
2064                 } else {
2065                         Location l = lt.Location;
2066
2067                         int m = (int) $2;
2068                         if (!RootContext.StdLib && current_container.Name == "System.Object")
2069                                 m |= Modifiers.PROTECTED | Modifiers.VIRTUAL;
2070                         else
2071                                 m |= Modifiers.PROTECTED | Modifiers.OVERRIDE;
2072
2073                         Method d = new Destructor (
2074                                 current_class, TypeManager.system_void_expr, m, "Finalize",
2075                                 new Parameters (null, null), (Attributes) $1, l);
2076                         if (RootContext.Documentation != null)
2077                                 d.DocComment = ConsumeStoredComment ();
2078
2079                         d.Block = (ToplevelBlock) $8;
2080                         current_container.AddMethod (d);
2081                 }
2082           }
2083         ;
2084
2085 event_declaration
2086         : opt_attributes
2087           opt_modifiers
2088           EVENT type variable_declarators SEMICOLON
2089           {
2090                 foreach (VariableDeclaration var in (ArrayList) $5) {
2091
2092                         MemberName name = new MemberName (var.identifier,
2093                                 var.Location);
2094
2095                         Event e = new EventField (
2096                                 current_class, (Expression) $4, (int) $2, false, name,
2097                                 var.expression_or_array_initializer, (Attributes) $1);
2098
2099                         current_container.AddEvent (e);
2100
2101                         if (RootContext.Documentation != null) {
2102                                 e.DocComment = Lexer.consume_doc_comment ();
2103                                 Lexer.doc_state = XmlCommentState.Allowed;
2104                         }
2105                 }
2106           }
2107         | opt_attributes
2108           opt_modifiers
2109           EVENT type namespace_or_type_name
2110           OPEN_BRACE
2111           {
2112                 implicit_value_parameter_type = (Expression) $4;
2113                 lexer.EventParsing = true;
2114           }
2115           event_accessor_declarations
2116           {
2117                 lexer.EventParsing = false;
2118           }
2119           CLOSE_BRACE
2120           {
2121                 MemberName name = (MemberName) $5;
2122
2123                 if ($8 == null){
2124                         Report.Error (65, (Location) $3, "`{0}.{1}': event property must have both add and remove accessors",
2125                                 current_container.Name, name);
2126                         $$ = null;
2127                 } else {
2128                         Pair pair = (Pair) $8;
2129                         if (pair.First == null || pair.Second == null)
2130                                 // CS0073 is already reported, so no CS0065 here.
2131                                 $$ = null;
2132                         else {
2133                                 Event e = new EventProperty (
2134                                         current_class, (Expression) $4, (int) $2, false, name, null,
2135                                         (Attributes) $1, (Accessor) pair.First, (Accessor) pair.Second);
2136                                 if (RootContext.Documentation != null) {
2137                                         e.DocComment = Lexer.consume_doc_comment ();
2138                                         Lexer.doc_state = XmlCommentState.Allowed;
2139                                 }
2140
2141                                 current_container.AddEvent (e);
2142                                 implicit_value_parameter_type = null;
2143                         }
2144                 }
2145           }
2146         | opt_attributes opt_modifiers EVENT type namespace_or_type_name error {
2147                 MemberName mn = (MemberName) $5;
2148
2149                 if (mn.Left != null)
2150                         Report.Error (71, mn.Location, "An explicit interface implementation of an event must use property syntax");
2151                 else
2152                         Report.Error (71, mn.Location, "Event declaration should use property syntax");
2153
2154                 if (RootContext.Documentation != null)
2155                         Lexer.doc_state = XmlCommentState.Allowed;
2156           }
2157         ;
2158
2159 event_accessor_declarations
2160         : add_accessor_declaration remove_accessor_declaration
2161           {
2162                 $$ = new Pair ($1, $2);
2163           }
2164         | remove_accessor_declaration add_accessor_declaration
2165           {
2166                 $$ = new Pair ($2, $1);
2167           }
2168         | add_accessor_declaration  { $$ = null; }
2169         | remove_accessor_declaration { $$ = null; }
2170         | error
2171           {
2172                 Report.Error (1055, GetLocation ($1), "An add or remove accessor expected");
2173                 $$ = null;
2174           }
2175         | { $$ = null; }
2176         ;
2177
2178 add_accessor_declaration
2179         : opt_attributes ADD
2180           {
2181                 Parameter [] args = new Parameter [1];
2182                 Parameter implicit_value_parameter = new Parameter (
2183                         implicit_value_parameter_type, "value",
2184                         Parameter.Modifier.NONE, null, (Location) $2);
2185
2186                 args [0] = implicit_value_parameter;
2187
2188                 current_local_parameters = new Parameters (args, null);
2189                 lexer.EventParsing = false;
2190           }
2191           block
2192           {
2193                 $$ = new Accessor ((ToplevelBlock) $4, 0, (Attributes) $1, (Location) $2);
2194                 lexer.EventParsing = true;
2195           }
2196         | opt_attributes ADD error {
2197                 Report.Error (73, (Location) $2, "An add or remove accessor must have a body");
2198                 $$ = null;
2199           }
2200         | opt_attributes modifiers ADD {
2201                 Report.Error (1609, (Location) $3, "Modifiers cannot be placed on event accessor declarations");
2202                 $$ = null;
2203           }
2204         ;
2205
2206 remove_accessor_declaration
2207         : opt_attributes REMOVE
2208           {
2209                 Parameter [] args = new Parameter [1];
2210                 Parameter implicit_value_parameter = new Parameter (
2211                         implicit_value_parameter_type, "value",
2212                         Parameter.Modifier.NONE, null, (Location) $2);
2213
2214                 args [0] = implicit_value_parameter;
2215
2216                 current_local_parameters = new Parameters (args, null);
2217                 lexer.EventParsing = false;
2218           }
2219           block
2220           {
2221                 $$ = new Accessor ((ToplevelBlock) $4, 0, (Attributes) $1, (Location) $2);
2222                 lexer.EventParsing = true;
2223           }
2224         | opt_attributes REMOVE error {
2225                 Report.Error (73, (Location) $2, "An add or remove accessor must have a body");
2226                 $$ = null;
2227           }
2228         | opt_attributes modifiers REMOVE {
2229                 Report.Error (1609, (Location) $3, "Modifiers cannot be placed on event accessor declarations");
2230                 $$ = null;
2231           }
2232         ;
2233
2234 indexer_declaration
2235         : opt_attributes opt_modifiers indexer_declarator
2236           OPEN_BRACE
2237           {
2238                 IndexerDeclaration decl = (IndexerDeclaration) $3;
2239
2240                 implicit_value_parameter_type = decl.type;
2241
2242                 lexer.PropertyParsing = true;
2243                 parsing_indexer  = true;
2244
2245                 indexer_parameters = decl.param_list;
2246           }
2247           accessor_declarations
2248           {
2249                   lexer.PropertyParsing = false;
2250                   has_get = has_set = false;
2251                   parsing_indexer  = false;
2252           }
2253           CLOSE_BRACE
2254           {
2255                 if ($6 == null)
2256                         break;
2257
2258                 // The signature is computed from the signature of the indexer.  Look
2259                 // at section 3.6 on the spec
2260                 Indexer indexer;
2261                 IndexerDeclaration decl = (IndexerDeclaration) $3;
2262                 Location loc = decl.location;
2263                 Pair pair = (Pair) $6;
2264                 Accessor get_block = (Accessor) pair.First;
2265                 Accessor set_block = (Accessor) pair.Second;
2266
2267                 MemberName name;
2268                 if (decl.interface_type != null)
2269                         name = new MemberName (decl.interface_type, TypeContainer.DefaultIndexerName, loc);
2270                 else
2271                         name = new MemberName (TypeContainer.DefaultIndexerName, loc);
2272
2273                 indexer = new Indexer (current_class, decl.type, name,
2274                                        (int) $2, false, decl.param_list, (Attributes) $1,
2275                                        get_block, set_block);
2276
2277                 if (RootContext.Documentation != null)
2278                         indexer.DocComment = ConsumeStoredComment ();
2279
2280                 current_container.AddIndexer (indexer);
2281
2282                 current_local_parameters = null;
2283                 implicit_value_parameter_type = null;
2284                 indexer_parameters = null;
2285           }
2286         ;
2287
2288 indexer_declarator
2289         : type THIS OPEN_BRACKET opt_formal_parameter_list CLOSE_BRACKET
2290           {
2291                 Parameters pars = (Parameters) $4;
2292                 if (pars.HasArglist) {
2293                         // "__arglist is not valid in this context"
2294                         Report.Error (1669, (Location) $2, "__arglist is not valid in this context");
2295                 } else if (pars.FixedParameters == null && pars.ArrayParameter == null){
2296                         Report.Error (1551, (Location) $2, "Indexers must have at least one parameter");
2297                 }
2298                 if (RootContext.Documentation != null) {
2299                         tmpComment = Lexer.consume_doc_comment ();
2300                         Lexer.doc_state = XmlCommentState.Allowed;
2301                 }
2302
2303                 $$ = new IndexerDeclaration ((Expression) $1, null, pars, (Location) $2);
2304           }
2305         | type namespace_or_type_name DOT THIS OPEN_BRACKET opt_formal_parameter_list CLOSE_BRACKET
2306           {
2307                 Parameters pars = (Parameters) $6;
2308
2309                 if (pars.HasArglist) {
2310                         // "__arglist is not valid in this context"
2311                         Report.Error (1669, (Location) $4, "__arglist is not valid in this context");
2312                 } else if (pars.FixedParameters == null && pars.ArrayParameter == null){
2313                         Report.Error (1551, (Location) $4, "Indexers must have at least one parameter");
2314                 }
2315
2316                 MemberName name = (MemberName) $2;
2317                 $$ = new IndexerDeclaration ((Expression) $1, name, pars, (Location) $4);
2318
2319                 if (RootContext.Documentation != null) {
2320                         tmpComment = Lexer.consume_doc_comment ();
2321                         Lexer.doc_state = XmlCommentState.Allowed;
2322                 }
2323           }
2324         ;
2325
2326 enum_declaration
2327         : opt_attributes
2328           opt_modifiers
2329           opt_partial
2330           ENUM IDENTIFIER
2331           opt_enum_base {
2332                 if (RootContext.Documentation != null)
2333                         enumTypeComment = Lexer.consume_doc_comment ();
2334           }
2335           enum_body
2336           opt_semicolon
2337           {
2338                 LocatedToken lt = (LocatedToken) $5;
2339                 Location enum_location = lt.Location;
2340
2341                 if ($3 != null) {
2342                         Report.Error (267, lt.Location, "The partial modifier can only appear immediately before `class', `struct' or `interface'");
2343                         break;  // assumes that the parser put us in a switch
2344                 }
2345
2346                 MemberName name = MakeName (new MemberName (lt.Value, enum_location));
2347                 Enum e = new Enum (current_namespace, current_class, (Expression) $6, (int) $2,
2348                                    name, (Attributes) $1);
2349
2350                 if (RootContext.Documentation != null)
2351                         e.DocComment = enumTypeComment;
2352
2353
2354                 EnumMember em = null;
2355                 foreach (VariableDeclaration ev in (ArrayList) $8) {
2356                         em = new EnumMember (e, em, (Expression) ev.expression_or_array_initializer,
2357                                 new MemberName (ev.identifier, ev.Location), ev.OptAttributes);
2358
2359 //                      if (RootContext.Documentation != null)
2360                                 em.DocComment = ev.DocComment;
2361
2362                         e.AddEnumMember (em);
2363                 }
2364
2365                 current_container.AddEnum (e);
2366                 RootContext.Tree.RecordDecl (current_namespace.NS, name, e);
2367                 $$ = e;
2368
2369           }
2370         ;
2371
2372 opt_enum_base
2373         : /* empty */           { $$ = TypeManager.system_int32_expr; }
2374         | COLON type            { $$ = $2;   }
2375         ;
2376
2377 enum_body
2378         : OPEN_BRACE
2379           {
2380                 if (RootContext.Documentation != null)
2381                         Lexer.doc_state = XmlCommentState.Allowed;
2382           }
2383           opt_enum_member_declarations
2384           {
2385                 // here will be evaluated after CLOSE_BLACE is consumed.
2386                 if (RootContext.Documentation != null)
2387                         Lexer.doc_state = XmlCommentState.Allowed;
2388           }
2389           CLOSE_BRACE
2390           {
2391                 $$ = $3;
2392           }
2393         ;
2394
2395 opt_enum_member_declarations
2396         : /* empty */                   { $$ = new ArrayList (4); }
2397         | enum_member_declarations opt_comma { $$ = $1; }
2398         ;
2399
2400 enum_member_declarations
2401         : enum_member_declaration
2402           {
2403                 ArrayList l = new ArrayList (4);
2404
2405                 l.Add ($1);
2406                 $$ = l;
2407           }
2408         | enum_member_declarations COMMA enum_member_declaration
2409           {
2410                 ArrayList l = (ArrayList) $1;
2411
2412                 l.Add ($3);
2413
2414                 $$ = l;
2415           }
2416         ;
2417
2418 enum_member_declaration
2419         : opt_attributes IDENTIFIER
2420           {
2421                 VariableDeclaration vd = new VariableDeclaration (
2422                         (LocatedToken) $2, null, (Attributes) $1);
2423
2424                 if (RootContext.Documentation != null) {
2425                         vd.DocComment = Lexer.consume_doc_comment ();
2426                         Lexer.doc_state = XmlCommentState.Allowed;
2427                 }
2428
2429                 $$ = vd;
2430           }
2431         | opt_attributes IDENTIFIER
2432           {
2433                 if (RootContext.Documentation != null) {
2434                         tmpComment = Lexer.consume_doc_comment ();
2435                         Lexer.doc_state = XmlCommentState.NotAllowed;
2436                 }
2437           }
2438           ASSIGN expression
2439           {
2440                 VariableDeclaration vd = new VariableDeclaration (
2441                         (LocatedToken) $2, $5, (Attributes) $1);
2442
2443                 if (RootContext.Documentation != null)
2444                         vd.DocComment = ConsumeStoredComment ();
2445
2446                 $$ = vd;
2447           }
2448         ;
2449
2450 delegate_declaration
2451         : opt_attributes
2452           opt_modifiers
2453           DELEGATE type member_name
2454           OPEN_PARENS opt_formal_parameter_list CLOSE_PARENS
2455           SEMICOLON
2456           {
2457                 MemberName name = MakeName ((MemberName) $5);
2458                 Delegate del = new Delegate (current_namespace, current_class, (Expression) $4,
2459                                              (int) $2, name, (Parameters) $7, (Attributes) $1);
2460
2461                 if (RootContext.Documentation != null) {
2462                         del.DocComment = Lexer.consume_doc_comment ();
2463                         Lexer.doc_state = XmlCommentState.Allowed;
2464                 }
2465
2466                 current_container.AddDelegate (del);
2467                 RootContext.Tree.RecordDecl (current_namespace.NS, name, del);
2468                 $$ = del;
2469           }
2470         ;
2471
2472 namespace_or_type_name
2473         : member_name
2474         | IDENTIFIER DOUBLE_COLON IDENTIFIER {
2475                 LocatedToken lt1 = (LocatedToken) $1;
2476                 LocatedToken lt2 = (LocatedToken) $3;
2477                 $$ = new MemberName (lt1.Value, lt2.Value, lt2.Location);
2478           }
2479         | namespace_or_type_name DOT IDENTIFIER {
2480                 LocatedToken lt = (LocatedToken) $3;
2481                 $$ = new MemberName ((MemberName) $1, lt.Value);
2482           }
2483         ;
2484
2485 member_name
2486         : IDENTIFIER {
2487                 LocatedToken lt = (LocatedToken) $1;
2488                 $$ = new MemberName (lt.Value, lt.Location);
2489           }
2490         ;
2491
2492 /*
2493  * Before you think of adding a return_type, notice that we have been
2494  * using two rules in the places where it matters (one rule using type
2495  * and another identical one that uses VOID as the return type).  This
2496  * gets rid of a shift/reduce couple
2497  */
2498 type
2499         : namespace_or_type_name
2500           {
2501                 MemberName name = (MemberName) $1;
2502                 $$ = name.GetTypeExpression ();
2503           }
2504         | builtin_types
2505         | array_type
2506         | pointer_type
2507         ;
2508
2509
2510 pointer_type
2511         : type STAR
2512           {
2513                 //
2514                 // Note that here only unmanaged types are allowed but we
2515                 // can't perform checks during this phase - we do it during
2516                 // semantic analysis.
2517                 //
2518                 $$ = new ComposedCast ((Expression) $1, "*");
2519           }
2520         | VOID STAR
2521           {
2522                 $$ = new ComposedCast (TypeManager.system_void_expr, "*", (Location) $1);
2523           }
2524         ;
2525
2526 non_expression_type
2527         : builtin_types
2528         | non_expression_type rank_specifier
2529           {
2530                 $$ = new ComposedCast ((Expression) $1, (string) $2);
2531           }
2532         | non_expression_type STAR
2533           {
2534                 $$ = new ComposedCast ((Expression) $1, "*");
2535           }
2536         | expression rank_specifiers
2537           {
2538                 $$ = new ComposedCast ((Expression) $1, (string) $2);
2539           }
2540         | expression STAR
2541           {
2542                 $$ = new ComposedCast ((Expression) $1, "*");
2543           }
2544
2545         //
2546         // We need this because the parser will happily go and reduce IDENTIFIER STAR
2547         // through this different path
2548         //
2549         | multiplicative_expression STAR
2550           {
2551                 $$ = new ComposedCast ((Expression) $1, "*");
2552           }
2553         ;
2554
2555 type_list
2556         : type
2557           {
2558                 ArrayList types = new ArrayList (4);
2559
2560                 types.Add ($1);
2561                 $$ = types;
2562           }
2563         | type_list COMMA type
2564           {
2565                 ArrayList types = (ArrayList) $1;
2566
2567                 types.Add ($3);
2568                 $$ = types;
2569           }
2570         ;
2571
2572 /*
2573  * replaces all the productions for isolating the various
2574  * simple types, but we need this to reuse it easily in local_variable_type
2575  */
2576 builtin_types
2577         : OBJECT        { $$ = TypeManager.system_object_expr; }
2578         | STRING        { $$ = TypeManager.system_string_expr; }
2579         | BOOL          { $$ = TypeManager.system_boolean_expr; }
2580         | DECIMAL       { $$ = TypeManager.system_decimal_expr; }
2581         | FLOAT         { $$ = TypeManager.system_single_expr; }
2582         | DOUBLE        { $$ = TypeManager.system_double_expr; }
2583         | integral_type
2584         ;
2585
2586 integral_type
2587         : SBYTE         { $$ = TypeManager.system_sbyte_expr; }
2588         | BYTE          { $$ = TypeManager.system_byte_expr; }
2589         | SHORT         { $$ = TypeManager.system_int16_expr; }
2590         | USHORT        { $$ = TypeManager.system_uint16_expr; }
2591         | INT           { $$ = TypeManager.system_int32_expr; }
2592         | UINT          { $$ = TypeManager.system_uint32_expr; }
2593         | LONG          { $$ = TypeManager.system_int64_expr; }
2594         | ULONG         { $$ = TypeManager.system_uint64_expr; }
2595         | CHAR          { $$ = TypeManager.system_char_expr; }
2596         | VOID          { $$ = TypeManager.system_void_expr; }
2597         ;
2598
2599 array_type
2600         : type rank_specifiers
2601           {
2602                 $$ = new ComposedCast ((Expression) $1, (string) $2);
2603           }
2604         ;
2605
2606 //
2607 // Expressions, section 7.5
2608 //
2609 primary_expression
2610         : literal
2611           {
2612                 // 7.5.1: Literals
2613           }
2614
2615         | member_name
2616           {
2617                 MemberName mn = (MemberName) $1;
2618                 $$ = mn.GetTypeExpression ();
2619           }
2620         | IDENTIFIER DOUBLE_COLON IDENTIFIER
2621           {
2622                 LocatedToken lt1 = (LocatedToken) $1;
2623                 LocatedToken lt2 = (LocatedToken) $3;
2624                 $$ = new QualifiedAliasMember (lt1.Value, lt2.Value, lt2.Location);
2625           }
2626         | parenthesized_expression
2627         | member_access
2628         | invocation_expression
2629         | element_access
2630         | this_access
2631         | base_access
2632         | post_increment_expression
2633         | post_decrement_expression
2634         | new_expression
2635         | typeof_expression
2636         | sizeof_expression
2637         | checked_expression
2638         | unchecked_expression
2639         | pointer_member_access
2640         | anonymous_method_expression
2641         ;
2642
2643 literal
2644         : boolean_literal
2645         | integer_literal
2646         | real_literal
2647         | LITERAL_CHARACTER     { $$ = new CharLiteral ((char) lexer.Value); }
2648         | LITERAL_STRING        { $$ = new StringLiteral ((string) lexer.Value); }
2649         | NULL                  { $$ = NullLiteral.Null; }
2650         ;
2651
2652 real_literal
2653         : LITERAL_FLOAT         { $$ = new FloatLiteral ((float) lexer.Value); }
2654         | LITERAL_DOUBLE        { $$ = new DoubleLiteral ((double) lexer.Value); }
2655         | LITERAL_DECIMAL       { $$ = new DecimalLiteral ((decimal) lexer.Value); }
2656         ;
2657
2658 integer_literal
2659         : LITERAL_INTEGER       {
2660                 object v = lexer.Value;
2661
2662                 if (v is int){
2663                         int i = (int) v;
2664
2665                         if (i == 0)
2666                                 $$ = IntLiteral.Zero;
2667                         else if (i == 1)
2668                                 $$ = IntLiteral.One;
2669                         else
2670                                 $$ = new IntLiteral (i);
2671                 } else if (v is uint)
2672                         $$ = new UIntLiteral ((UInt32) v);
2673                 else if (v is long)
2674                         $$ = new LongLiteral ((Int64) v);
2675                 else if (v is ulong)
2676                         $$ = new ULongLiteral ((UInt64) v);
2677                 else
2678                         Console.WriteLine ("OOPS.  Unexpected result from scanner");
2679           }
2680         ;
2681
2682 boolean_literal
2683         : TRUE                  { $$ = new BoolLiteral (true); }
2684         | FALSE                 { $$ = new BoolLiteral (false); }
2685         ;
2686
2687 parenthesized_expression_0
2688         : OPEN_PARENS expression CLOSE_PARENS
2689           {
2690                 $$ = $2;
2691                 lexer.Deambiguate_CloseParens ();
2692                 // After this, the next token returned is one of
2693                 // CLOSE_PARENS_CAST, CLOSE_PARENS_NO_CAST, CLOSE_PARENS_OPEN_PARENS
2694                 // or CLOSE_PARENS_MINUS.
2695           }
2696         ;
2697
2698 parenthesized_expression
2699         : parenthesized_expression_0 CLOSE_PARENS_NO_CAST
2700           {
2701                 $$ = $1;
2702           }
2703         | parenthesized_expression_0 CLOSE_PARENS_MINUS
2704           {
2705                 // If a parenthesized expression is followed by a minus, we need to wrap
2706                 // the expression inside a ParenthesizedExpression for the CS0075 check
2707                 // in Binary.DoResolve().
2708                 $$ = new ParenthesizedExpression ((Expression) $1);
2709           }
2710         ;;
2711
2712 member_access
2713         : primary_expression DOT IDENTIFIER
2714           {
2715                 LocatedToken lt = (LocatedToken) $3;
2716                 $$ = new MemberAccess ((Expression) $1, lt.Value, lt.Location);
2717           }
2718         | predefined_type DOT IDENTIFIER
2719           {
2720                 LocatedToken lt = (LocatedToken) $3;
2721                 $$ = new MemberAccess ((Expression) $1, lt.Value, lt.Location);
2722           }
2723         ;
2724
2725 predefined_type
2726         : builtin_types
2727         ;
2728
2729 invocation_expression
2730         : primary_expression {
2731                 $$ = lexer.Location;
2732           } OPEN_PARENS opt_argument_list CLOSE_PARENS
2733           {
2734                 if ($1 == null) {
2735                         Location l = (Location) $3;
2736                         Report.Error (1, l, "Parse error");
2737                 }
2738                 $$ = new Invocation ((Expression) $1, (ArrayList) $4);
2739           }
2740         | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS OPEN_PARENS CLOSE_PARENS
2741           {
2742                 $$ = new Invocation ((Expression) $1, new ArrayList ());
2743           }
2744         | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS primary_expression
2745           {
2746                 $$ = new InvocationOrCast ((Expression) $1, (Expression) $3);
2747           }
2748         | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS OPEN_PARENS non_simple_argument CLOSE_PARENS
2749           {
2750                 ArrayList args = new ArrayList (1);
2751                 args.Add ($4);
2752                 $$ = new Invocation ((Expression) $1, args);
2753           }
2754         | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS OPEN_PARENS argument_list COMMA argument CLOSE_PARENS
2755           {
2756                 ArrayList args = ((ArrayList) $4);
2757                 args.Add ($6);
2758                 $$ = new Invocation ((Expression) $1, args);
2759           }
2760         ;
2761
2762 opt_argument_list
2763         : /* empty */           { $$ = null; }
2764         | argument_list
2765         ;
2766
2767 argument_list
2768         : argument
2769           {
2770                 ArrayList list = new ArrayList (4);
2771                 list.Add ($1);
2772                 $$ = list;
2773           }
2774         | argument_list COMMA argument
2775           {
2776                 ArrayList list = (ArrayList) $1;
2777                 list.Add ($3);
2778                 $$ = list;
2779           }
2780         | argument_list error {
2781                 CheckToken (1026, yyToken, "Expected `,' or `)'", GetLocation ($2));
2782                 $$ = null;
2783           }
2784         ;
2785
2786 argument
2787         : expression
2788           {
2789                 $$ = new Argument ((Expression) $1, Argument.AType.Expression);
2790           }
2791         | non_simple_argument
2792           {
2793                 $$ = $1;
2794           }
2795         ;
2796
2797 non_simple_argument
2798         : REF variable_reference
2799           {
2800                 $$ = new Argument ((Expression) $2, Argument.AType.Ref);
2801           }
2802         | OUT variable_reference
2803           {
2804                 $$ = new Argument ((Expression) $2, Argument.AType.Out);
2805           }
2806         | ARGLIST OPEN_PARENS argument_list CLOSE_PARENS
2807           {
2808                 ArrayList list = (ArrayList) $3;
2809                 Argument[] args = new Argument [list.Count];
2810                 list.CopyTo (args, 0);
2811
2812                 Expression expr = new Arglist (args, (Location) $1);
2813                 $$ = new Argument (expr, Argument.AType.Expression);
2814           }
2815         | ARGLIST
2816           {
2817                 $$ = new Argument (new ArglistAccess ((Location) $1), Argument.AType.ArgList);
2818           }
2819         ;
2820
2821 variable_reference
2822         : expression { note ("section 5.4"); $$ = $1; }
2823         ;
2824
2825 element_access
2826         : primary_expression OPEN_BRACKET expression_list CLOSE_BRACKET
2827           {
2828                 $$ = new ElementAccess ((Expression) $1, (ArrayList) $3);
2829           }
2830         | primary_expression rank_specifiers
2831           {
2832                 // So the super-trick is that primary_expression
2833                 // can only be either a SimpleName or a MemberAccess.
2834                 // The MemberAccess case arises when you have a fully qualified type-name like :
2835                 // Foo.Bar.Blah i;
2836                 // SimpleName is when you have
2837                 // Blah i;
2838
2839                 Expression expr = (Expression) $1;
2840                 if (expr is ComposedCast){
2841                         $$ = new ComposedCast (expr, (string) $2);
2842                 } else if (!(expr is SimpleName || expr is MemberAccess || expr is QualifiedAliasMember)){
2843                         Error_ExpectingTypeName (expr);
2844                         $$ = TypeManager.system_object_expr;
2845                 } else {
2846                         //
2847                         // So we extract the string corresponding to the SimpleName
2848                         // or MemberAccess
2849                         //
2850                         $$ = new ComposedCast (expr, (string) $2);
2851                 }
2852           }
2853         ;
2854
2855 expression_list
2856         : expression
2857           {
2858                 ArrayList list = new ArrayList (4);
2859                 list.Add ($1);
2860                 $$ = list;
2861           }
2862         | expression_list COMMA expression
2863           {
2864                 ArrayList list = (ArrayList) $1;
2865                 list.Add ($3);
2866                 $$ = list;
2867           }
2868         ;
2869
2870 this_access
2871         : THIS
2872           {
2873                 $$ = new This (current_block, (Location) $1);
2874           }
2875         ;
2876
2877 base_access
2878         : BASE DOT IDENTIFIER
2879           {
2880                 LocatedToken lt = (LocatedToken) $3;
2881                 $$ = new BaseAccess (lt.Value, lt.Location);
2882           }
2883         | BASE OPEN_BRACKET expression_list CLOSE_BRACKET
2884           {
2885                 $$ = new BaseIndexerAccess ((ArrayList) $3, (Location) $1);
2886           }
2887         | BASE error {
2888                 Report.Error (175, (Location) $1, "Use of keyword `base' is not valid in this context");
2889                 $$ = null;
2890           }
2891         ;
2892
2893 post_increment_expression
2894         : primary_expression OP_INC
2895           {
2896                 $$ = new UnaryMutator (UnaryMutator.Mode.PostIncrement,
2897                                        (Expression) $1, (Location) $2);
2898           }
2899         ;
2900
2901 post_decrement_expression
2902         : primary_expression OP_DEC
2903           {
2904                 $$ = new UnaryMutator (UnaryMutator.Mode.PostDecrement,
2905                                        (Expression) $1, (Location) $2);
2906           }
2907         ;
2908
2909 new_expression
2910         : object_or_delegate_creation_expression
2911         | array_creation_expression
2912         ;
2913
2914 object_or_delegate_creation_expression
2915         : NEW type OPEN_PARENS opt_argument_list CLOSE_PARENS
2916           {
2917                 $$ = new New ((Expression) $2, (ArrayList) $4, (Location) $1);
2918           }
2919         ;
2920
2921 array_creation_expression
2922         : NEW type OPEN_BRACKET expression_list CLOSE_BRACKET
2923           opt_rank_specifier
2924           opt_array_initializer
2925           {
2926                 $$ = new ArrayCreation ((Expression) $2, (ArrayList) $4, (string) $6, (ArrayList) $7, (Location) $1);
2927           }
2928         | NEW type rank_specifiers array_initializer
2929           {
2930                 $$ = new ArrayCreation ((Expression) $2, (string) $3, (ArrayList) $4, (Location) $1);
2931           }
2932         | NEW error
2933           {
2934                 Report.Error (1031, (Location) $1, "Type expected");
2935                 $$ = null;
2936           }
2937         | NEW type error
2938           {
2939                 Report.Error (1526, (Location) $1, "A new expression requires () or [] after type");
2940                 $$ = null;
2941           }
2942         ;
2943
2944 opt_rank_specifier
2945         : /* empty */
2946           {
2947                   $$ = "";
2948           }
2949         | rank_specifiers
2950           {
2951                         $$ = $1;
2952           }
2953         ;
2954
2955 rank_specifiers
2956         : rank_specifier opt_rank_specifier
2957           {
2958                   $$ = (string) $2 + (string) $1;
2959           }
2960         ;
2961
2962 rank_specifier
2963         : OPEN_BRACKET opt_dim_separators CLOSE_BRACKET
2964           {
2965                 $$ = "[" + (string) $2 + "]";
2966           }
2967         ;
2968
2969 opt_dim_separators
2970         : /* empty */
2971           {
2972                 $$ = "";
2973           }
2974         | dim_separators
2975           {
2976                   $$ = $1;
2977           }
2978         ;
2979
2980 dim_separators
2981         : COMMA
2982           {
2983                 $$ = ",";
2984           }
2985         | dim_separators COMMA
2986           {
2987                 $$ = (string) $1 + ",";
2988           }
2989         ;
2990
2991 opt_array_initializer
2992         : /* empty */
2993           {
2994                 $$ = null;
2995           }
2996         | array_initializer
2997           {
2998                 $$ = $1;
2999           }
3000         ;
3001
3002 array_initializer
3003         : OPEN_BRACE CLOSE_BRACE
3004           {
3005                 ArrayList list = new ArrayList (4);
3006                 $$ = list;
3007           }
3008         | OPEN_BRACE variable_initializer_list opt_comma CLOSE_BRACE
3009           {
3010                 $$ = (ArrayList) $2;
3011           }
3012         ;
3013
3014 variable_initializer_list
3015         : variable_initializer
3016           {
3017                 ArrayList list = new ArrayList (4);
3018                 list.Add ($1);
3019                 $$ = list;
3020           }
3021         | variable_initializer_list COMMA variable_initializer
3022           {
3023                 ArrayList list = (ArrayList) $1;
3024                 list.Add ($3);
3025                 $$ = list;
3026           }
3027         ;
3028
3029 typeof_expression
3030         : TYPEOF OPEN_PARENS VOID CLOSE_PARENS
3031           {
3032                 $$ = new TypeOfVoid ((Location) $1);
3033           }
3034         | TYPEOF OPEN_PARENS type CLOSE_PARENS
3035           {
3036                 $$ = new TypeOf ((Expression) $3, (Location) $1);
3037           }
3038         ;
3039
3040 sizeof_expression
3041         : SIZEOF OPEN_PARENS type CLOSE_PARENS {
3042                 $$ = new SizeOf ((Expression) $3, (Location) $1);
3043           }
3044         ;
3045
3046 checked_expression
3047         : CHECKED OPEN_PARENS expression CLOSE_PARENS
3048           {
3049                 $$ = new CheckedExpr ((Expression) $3, (Location) $1);
3050           }
3051         ;
3052
3053 unchecked_expression
3054         : UNCHECKED OPEN_PARENS expression CLOSE_PARENS
3055           {
3056                 $$ = new UnCheckedExpr ((Expression) $3, (Location) $1);
3057           }
3058         ;
3059
3060 pointer_member_access
3061         : primary_expression OP_PTR IDENTIFIER
3062           {
3063                 Expression deref;
3064                 LocatedToken lt = (LocatedToken) $3;
3065
3066                 deref = new Unary (Unary.Operator.Indirection, (Expression) $1, lt.Location);
3067                 $$ = new MemberAccess (deref, lt.Value, lt.Location);
3068           }
3069         ;
3070
3071 anonymous_method_expression
3072         : DELEGATE opt_anonymous_method_signature
3073           {
3074                 oob_stack.Push (current_local_parameters);
3075                 current_local_parameters = (Parameters)$2;
3076
3077                 // Force the next block to be created as a ToplevelBlock
3078                 oob_stack.Push (current_block);
3079                 oob_stack.Push (top_current_block);
3080                 current_block = null;
3081           }
3082           block
3083           {
3084                 Location loc = (Location) $1;
3085                 top_current_block = (Block) oob_stack.Pop ();
3086                 current_block = (Block) oob_stack.Pop ();
3087                 if (RootContext.Version == LanguageVersion.ISO_1){
3088                         Report.FeatureIsNotStandardized (loc, "anonymous methods");
3089                         $$ = null;
3090                 } else  {
3091                         ToplevelBlock anon_block = (ToplevelBlock) $4;
3092
3093                         anon_block.Parent = current_block;
3094                         $$ = new AnonymousMethod ((Parameters) $2, (ToplevelBlock) top_current_block,
3095                                 anon_block, loc);
3096                 }
3097                 current_local_parameters = (Parameters) oob_stack.Pop ();
3098           }
3099         ;
3100
3101 opt_anonymous_method_signature
3102         : /* empty */                   { $$ = null; }
3103         | anonymous_method_signature
3104         ;
3105
3106 anonymous_method_signature
3107         : OPEN_PARENS opt_anonymous_method_parameter_list CLOSE_PARENS
3108           {
3109                 if ($2 == null)
3110                         $$ = Parameters.EmptyReadOnlyParameters;
3111                 else {
3112                         ArrayList par_list = (ArrayList) $2;
3113                         Parameter [] pars = new Parameter [par_list.Count];
3114                         par_list.CopyTo (pars);
3115                         $$ = new Parameters (pars, null);
3116                 }
3117           }
3118         ;
3119
3120 opt_anonymous_method_parameter_list
3121         : /* empty */                      { $$ = null; }
3122         | anonymous_method_parameter_list  { $$ = $1; }
3123         ;
3124
3125 anonymous_method_parameter_list
3126         : anonymous_method_parameter
3127           {
3128                 ArrayList a = new ArrayList (4);
3129                 a.Add ($1);
3130                 $$ = a;
3131           }
3132         | anonymous_method_parameter_list COMMA anonymous_method_parameter
3133           {
3134                 ArrayList a = (ArrayList) $1;
3135                 a.Add ($3);
3136                 $$ = a;
3137           }
3138         ;
3139
3140 anonymous_method_parameter
3141         : opt_parameter_modifier type IDENTIFIER {
3142                 LocatedToken lt = (LocatedToken) $3;
3143                 $$ = new Parameter ((Expression) $2, lt.Value, (Parameter.Modifier) $1, null, lt.Location);
3144           }
3145         | PARAMS type IDENTIFIER {
3146                 Report.Error (1670, ((LocatedToken) $3).Location, "The `params' modifier is not allowed in anonymous method declaration");
3147                 $$ = null;
3148           }
3149         ;
3150
3151 unary_expression
3152         : primary_expression
3153         | BANG prefixed_unary_expression
3154           {
3155                 $$ = new Unary (Unary.Operator.LogicalNot, (Expression) $2, (Location) $1);
3156           }
3157         | TILDE prefixed_unary_expression
3158           {
3159                 $$ = new Unary (Unary.Operator.OnesComplement, (Expression) $2, (Location) $1);
3160           }
3161         | cast_expression
3162         ;
3163
3164 cast_list
3165         : parenthesized_expression_0 CLOSE_PARENS_CAST unary_expression
3166           {
3167                 $$ = new Cast ((Expression) $1, (Expression) $3);
3168           }
3169         | parenthesized_expression_0 CLOSE_PARENS_OPEN_PARENS cast_expression
3170           {
3171                 $$ = new Cast ((Expression) $1, (Expression) $3);
3172           }
3173         ;
3174
3175 cast_expression
3176         : cast_list
3177         | OPEN_PARENS non_expression_type CLOSE_PARENS prefixed_unary_expression
3178           {
3179                 $$ = new Cast ((Expression) $2, (Expression) $4);
3180           }
3181         ;
3182
3183         //
3184         // The idea to split this out is from Rhys' grammar
3185         // to solve the problem with casts.
3186         //
3187 prefixed_unary_expression
3188         : unary_expression
3189         | PLUS prefixed_unary_expression
3190           {
3191                 $$ = new Unary (Unary.Operator.UnaryPlus, (Expression) $2, (Location) $1);
3192           }
3193         | MINUS prefixed_unary_expression
3194           {
3195                 $$ = new Unary (Unary.Operator.UnaryNegation, (Expression) $2, (Location) $1);
3196           }
3197         | OP_INC prefixed_unary_expression
3198           {
3199                 $$ = new UnaryMutator (UnaryMutator.Mode.PreIncrement,
3200                                        (Expression) $2, (Location) $1);
3201           }
3202         | OP_DEC prefixed_unary_expression
3203           {
3204                 $$ = new UnaryMutator (UnaryMutator.Mode.PreDecrement,
3205                                        (Expression) $2, (Location) $1);
3206           }
3207         | STAR prefixed_unary_expression
3208           {
3209                 $$ = new Unary (Unary.Operator.Indirection, (Expression) $2, (Location) $1);
3210           }
3211         | BITWISE_AND prefixed_unary_expression
3212           {
3213                 $$ = new Unary (Unary.Operator.AddressOf, (Expression) $2, (Location) $1);
3214           }
3215         ;
3216
3217 pre_increment_expression
3218         : OP_INC prefixed_unary_expression
3219           {
3220                 $$ = new UnaryMutator (UnaryMutator.Mode.PreIncrement,
3221                                        (Expression) $2, (Location) $1);
3222           }
3223         ;
3224
3225 pre_decrement_expression
3226         : OP_DEC prefixed_unary_expression
3227           {
3228                 $$ = new UnaryMutator (UnaryMutator.Mode.PreDecrement,
3229                                        (Expression) $2, (Location) $1);
3230           }
3231         ;
3232
3233 multiplicative_expression
3234         : prefixed_unary_expression
3235         | multiplicative_expression STAR prefixed_unary_expression
3236           {
3237                 $$ = new Binary (Binary.Operator.Multiply,
3238                                  (Expression) $1, (Expression) $3);
3239           }
3240         | multiplicative_expression DIV prefixed_unary_expression
3241           {
3242                 $$ = new Binary (Binary.Operator.Division,
3243                                  (Expression) $1, (Expression) $3);
3244           }
3245         | multiplicative_expression PERCENT prefixed_unary_expression
3246           {
3247                 $$ = new Binary (Binary.Operator.Modulus,
3248                                  (Expression) $1, (Expression) $3);
3249           }
3250         ;
3251
3252 additive_expression
3253         : multiplicative_expression
3254         | additive_expression PLUS multiplicative_expression
3255           {
3256                 $$ = new Binary (Binary.Operator.Addition,
3257                                  (Expression) $1, (Expression) $3);
3258           }
3259         | additive_expression MINUS multiplicative_expression
3260           {
3261                 $$ = new Binary (Binary.Operator.Subtraction,
3262                                  (Expression) $1, (Expression) $3);
3263           }
3264         ;
3265
3266 shift_expression
3267         : additive_expression
3268         | shift_expression OP_SHIFT_LEFT additive_expression
3269           {
3270                 $$ = new Binary (Binary.Operator.LeftShift,
3271                                  (Expression) $1, (Expression) $3);
3272           }
3273         | shift_expression OP_SHIFT_RIGHT additive_expression
3274           {
3275                 $$ = new Binary (Binary.Operator.RightShift,
3276                                  (Expression) $1, (Expression) $3);
3277           }
3278         ;
3279
3280 relational_expression
3281         : shift_expression
3282         | relational_expression OP_LT shift_expression
3283           {
3284                 $$ = new Binary (Binary.Operator.LessThan,
3285                                  (Expression) $1, (Expression) $3);
3286           }
3287         | relational_expression OP_GT shift_expression
3288           {
3289                 $$ = new Binary (Binary.Operator.GreaterThan,
3290                                  (Expression) $1, (Expression) $3);
3291           }
3292         | relational_expression OP_LE shift_expression
3293           {
3294                 $$ = new Binary (Binary.Operator.LessThanOrEqual,
3295                                  (Expression) $1, (Expression) $3);
3296           }
3297         | relational_expression OP_GE shift_expression
3298           {
3299                 $$ = new Binary (Binary.Operator.GreaterThanOrEqual,
3300                                  (Expression) $1, (Expression) $3);
3301           }
3302         | relational_expression IS type
3303           {
3304                 $$ = new Is ((Expression) $1, (Expression) $3, (Location) $2);
3305           }
3306         | relational_expression AS type
3307           {
3308                 $$ = new As ((Expression) $1, (Expression) $3, (Location) $2);
3309           }
3310         ;
3311
3312 equality_expression
3313         : relational_expression
3314         | equality_expression OP_EQ relational_expression
3315           {
3316                 $$ = new Binary (Binary.Operator.Equality,
3317                                  (Expression) $1, (Expression) $3);
3318           }
3319         | equality_expression OP_NE relational_expression
3320           {
3321                 $$ = new Binary (Binary.Operator.Inequality,
3322                                  (Expression) $1, (Expression) $3);
3323           }
3324         ;
3325
3326 and_expression
3327         : equality_expression
3328         | and_expression BITWISE_AND equality_expression
3329           {
3330                 $$ = new Binary (Binary.Operator.BitwiseAnd,
3331                                  (Expression) $1, (Expression) $3);
3332           }
3333         ;
3334
3335 exclusive_or_expression
3336         : and_expression
3337         | exclusive_or_expression CARRET and_expression
3338           {
3339                 $$ = new Binary (Binary.Operator.ExclusiveOr,
3340                                  (Expression) $1, (Expression) $3);
3341           }
3342         ;
3343
3344 inclusive_or_expression
3345         : exclusive_or_expression
3346         | inclusive_or_expression BITWISE_OR exclusive_or_expression
3347           {
3348                 $$ = new Binary (Binary.Operator.BitwiseOr,
3349                                  (Expression) $1, (Expression) $3);
3350           }
3351         ;
3352
3353 conditional_and_expression
3354         : inclusive_or_expression
3355         | conditional_and_expression OP_AND inclusive_or_expression
3356           {
3357                 $$ = new Binary (Binary.Operator.LogicalAnd,
3358                                  (Expression) $1, (Expression) $3);
3359           }
3360         ;
3361
3362 conditional_or_expression
3363         : conditional_and_expression
3364         | conditional_or_expression OP_OR conditional_and_expression
3365           {
3366                 $$ = new Binary (Binary.Operator.LogicalOr,
3367                                  (Expression) $1, (Expression) $3);
3368           }
3369         ;
3370
3371 conditional_expression
3372         : conditional_or_expression
3373         | conditional_or_expression INTERR expression COLON expression
3374           {
3375                 $$ = new Conditional ((Expression) $1, (Expression) $3, (Expression) $5);
3376           }
3377         ;
3378
3379 assignment_expression
3380         : prefixed_unary_expression ASSIGN expression
3381           {
3382                 $$ = new Assign ((Expression) $1, (Expression) $3);
3383           }
3384         | prefixed_unary_expression OP_MULT_ASSIGN expression
3385           {
3386                 $$ = new CompoundAssign (
3387                         Binary.Operator.Multiply, (Expression) $1, (Expression) $3);
3388           }
3389         | prefixed_unary_expression OP_DIV_ASSIGN expression
3390           {
3391                 $$ = new CompoundAssign (
3392                         Binary.Operator.Division, (Expression) $1, (Expression) $3);
3393           }
3394         | prefixed_unary_expression OP_MOD_ASSIGN expression
3395           {
3396                 $$ = new CompoundAssign (
3397                         Binary.Operator.Modulus, (Expression) $1, (Expression) $3);
3398           }
3399         | prefixed_unary_expression OP_ADD_ASSIGN expression
3400           {
3401                 $$ = new CompoundAssign (
3402                         Binary.Operator.Addition, (Expression) $1, (Expression) $3);
3403           }
3404         | prefixed_unary_expression OP_SUB_ASSIGN expression
3405           {
3406                 $$ = new CompoundAssign (
3407                         Binary.Operator.Subtraction, (Expression) $1, (Expression) $3);
3408           }
3409         | prefixed_unary_expression OP_SHIFT_LEFT_ASSIGN expression
3410           {
3411                 $$ = new CompoundAssign (
3412                         Binary.Operator.LeftShift, (Expression) $1, (Expression) $3);
3413           }
3414         | prefixed_unary_expression OP_SHIFT_RIGHT_ASSIGN expression
3415           {
3416                 $$ = new CompoundAssign (
3417                         Binary.Operator.RightShift, (Expression) $1, (Expression) $3);
3418           }
3419         | prefixed_unary_expression OP_AND_ASSIGN expression
3420           {
3421                 $$ = new CompoundAssign (
3422                         Binary.Operator.BitwiseAnd, (Expression) $1, (Expression) $3);
3423           }
3424         | prefixed_unary_expression OP_OR_ASSIGN expression
3425           {
3426                 $$ = new CompoundAssign (
3427                         Binary.Operator.BitwiseOr, (Expression) $1, (Expression) $3);
3428           }
3429         | prefixed_unary_expression OP_XOR_ASSIGN expression
3430           {
3431                 $$ = new CompoundAssign (
3432                         Binary.Operator.ExclusiveOr, (Expression) $1, (Expression) $3);
3433           }
3434         ;
3435
3436 expression
3437         : conditional_expression
3438         | assignment_expression
3439         ;
3440
3441 constant_expression
3442         : expression
3443         ;
3444
3445 boolean_expression
3446         : expression
3447         ;
3448
3449 //
3450 // 10 classes
3451 //
3452 class_declaration
3453         : opt_attributes
3454           opt_modifiers
3455           opt_partial
3456           CLASS member_name
3457           {
3458                 MemberName name = MakeName ((MemberName) $5);
3459                 int mod_flags = (int) $2;
3460
3461                 if ($3 != null) {
3462                         ClassPart part = PartialContainer.CreatePart (
3463                                 current_namespace, current_class, name, mod_flags,
3464                                 (Attributes) $1, Kind.Class, (Location) $3);
3465
3466                         current_container = part.PartialContainer;
3467                         current_class = part;
3468                 } else {
3469                         if ((mod_flags & Modifiers.STATIC) != 0) {
3470                                 current_class = new StaticClass (
3471                                         current_namespace, current_class, name,
3472                                         mod_flags, (Attributes) $1);
3473                         } else {
3474                                 current_class = new Class (
3475                                         current_namespace, current_class, name,
3476                                         mod_flags, (Attributes) $1);
3477                         }
3478
3479                         current_container.AddClassOrStruct (current_class);
3480                         current_container = current_class;
3481                         RootContext.Tree.RecordDecl (current_namespace.NS, name, current_class);
3482                 }
3483           }
3484           opt_class_base
3485           {
3486                 if ($7 != null) {
3487                         if (current_class.Name == "System.Object") {
3488                                 Report.Error (537, current_class.Location,
3489                                               "The class System.Object cannot have a base " +
3490                                               "class or implement an interface.");
3491                         }
3492                         current_class.Bases = (ArrayList) $7;
3493                 }
3494
3495                 if (RootContext.Documentation != null) {
3496                         current_class.DocComment = Lexer.consume_doc_comment ();
3497                         Lexer.doc_state = XmlCommentState.Allowed;
3498                 }
3499           }
3500           class_body
3501           {
3502                 if (RootContext.Documentation != null)
3503                         Lexer.doc_state = XmlCommentState.Allowed;
3504           }
3505           opt_semicolon
3506           {
3507                 $$ = pop_current_class ();
3508           }
3509         ;
3510
3511 opt_partial
3512         : /* empty */
3513           { $$ = null; }
3514         | PARTIAL
3515           { $$ = $1; } // location
3516         ;
3517
3518 opt_modifiers
3519         : /* empty */           { $$ = (int) 0; }
3520         | modifiers
3521         ;
3522
3523 modifiers
3524         : modifier
3525         | modifiers modifier
3526           {
3527                 int m1 = (int) $1;
3528                 int m2 = (int) $2;
3529
3530                 if ((m1 & m2) != 0) {
3531                         Location l = lexer.Location;
3532                         Report.Error (1004, l, "Duplicate `{0}' modifier", Modifiers.Name (m2));
3533                 }
3534                 $$ = (int) (m1 | m2);
3535           }
3536         ;
3537
3538 modifier
3539         : NEW                   { $$ = Modifiers.NEW; }
3540         | PUBLIC                { $$ = Modifiers.PUBLIC; }
3541         | PROTECTED             { $$ = Modifiers.PROTECTED; }
3542         | INTERNAL              { $$ = Modifiers.INTERNAL; }
3543         | PRIVATE               { $$ = Modifiers.PRIVATE; }
3544         | ABSTRACT              { $$ = Modifiers.ABSTRACT; }
3545         | SEALED                { $$ = Modifiers.SEALED; }
3546         | STATIC                { $$ = Modifiers.STATIC; }
3547         | READONLY              { $$ = Modifiers.READONLY; }
3548         | VIRTUAL               { $$ = Modifiers.VIRTUAL; }
3549         | OVERRIDE              { $$ = Modifiers.OVERRIDE; }
3550         | EXTERN                { $$ = Modifiers.EXTERN; }
3551         | VOLATILE              { $$ = Modifiers.VOLATILE; }
3552         | UNSAFE                { $$ = Modifiers.UNSAFE; }
3553         ;
3554
3555 opt_class_base
3556         : /* empty */           { $$ = null; }
3557         | class_base            { $$ = $1;   }
3558         ;
3559
3560 class_base
3561         : COLON type_list { $$ = $2; }
3562         ;
3563
3564 //
3565 // Statements (8.2)
3566 //
3567
3568 //
3569 // A block is "contained" on the following places:
3570 //      method_body
3571 //      property_declaration as part of the accessor body (get/set)
3572 //      operator_declaration
3573 //      constructor_declaration
3574 //      destructor_declaration
3575 //      event_declaration as part of add_accessor_declaration or remove_accessor_declaration
3576 //
3577 block
3578         : OPEN_BRACE
3579           {
3580                 if (current_block == null){
3581                         current_block = new ToplevelBlock ((ToplevelBlock) top_current_block, current_local_parameters, (Location) $1);
3582                         top_current_block = current_block;
3583                 } else {
3584                 current_block = new Block (current_block, (Location) $1, Location.Null);
3585                 }
3586           }
3587           opt_statement_list CLOSE_BRACE
3588           {
3589                 while (current_block.Implicit)
3590                         current_block = current_block.Parent;
3591                 $$ = current_block;
3592                 current_block.SetEndLocation ((Location) $4);
3593                 current_block = current_block.Parent;
3594                 if (current_block == null)
3595                         top_current_block = null;
3596           }
3597         ;
3598
3599 opt_statement_list
3600         : /* empty */
3601         | statement_list
3602         ;
3603
3604 statement_list
3605         : statement
3606         | statement_list statement
3607         ;
3608
3609 statement
3610         : declaration_statement
3611           {
3612                 if ($1 != null && (Block) $1 != current_block){
3613                         current_block.AddStatement ((Statement) $1);
3614                         current_block = (Block) $1;
3615                 }
3616           }
3617         | valid_declaration_statement
3618           {
3619                 current_block.AddStatement ((Statement) $1);
3620           }
3621         | labeled_statement
3622         ;
3623
3624 valid_declaration_statement
3625         : block
3626         | empty_statement
3627         | expression_statement
3628         | selection_statement
3629         | iteration_statement
3630         | jump_statement
3631         | try_statement
3632         | checked_statement
3633         | unchecked_statement
3634         | lock_statement
3635         | using_statement
3636         | unsafe_statement
3637         | fixed_statement
3638         ;
3639
3640 embedded_statement
3641         : valid_declaration_statement
3642         | declaration_statement
3643           {
3644                   Report.Error (1023, GetLocation ($1), "An embedded statement may not be a declaration or labeled statement");
3645                   $$ = null;
3646           }
3647         | labeled_statement
3648           {
3649                   Report.Error (1023, GetLocation ($1), "An embedded statement may not be a declaration or labeled statement");
3650                   $$ = null;
3651           }
3652         ;
3653
3654 empty_statement
3655         : SEMICOLON
3656           {
3657                   $$ = EmptyStatement.Value;
3658           }
3659         ;
3660
3661 labeled_statement
3662         : IDENTIFIER COLON
3663           {
3664                 LocatedToken lt = (LocatedToken) $1;
3665                 LabeledStatement labeled = new LabeledStatement (lt.Value, lt.Location);
3666
3667                 if (current_block.AddLabel (lt.Value, labeled, lt.Location))
3668                         current_block.AddStatement (labeled);
3669           }
3670           statement
3671         ;
3672
3673 declaration_statement
3674         : local_variable_declaration SEMICOLON
3675           {
3676                 if ($1 != null){
3677                         DictionaryEntry de = (DictionaryEntry) $1;
3678                         Expression e = (Expression) de.Key;
3679
3680                         $$ = declare_local_variables (e, (ArrayList) de.Value, e.Location);
3681                 }
3682           }
3683
3684         | local_constant_declaration SEMICOLON
3685           {
3686                 if ($1 != null){
3687                         DictionaryEntry de = (DictionaryEntry) $1;
3688
3689                         $$ = declare_local_constants ((Expression) de.Key, (ArrayList) de.Value);
3690                 }
3691           }
3692         ;
3693
3694 /*
3695  * The following is from Rhys' grammar:
3696  * > Types in local variable declarations must be recognized as
3697  * > expressions to prevent reduce/reduce errors in the grammar.
3698  * > The expressions are converted into types during semantic analysis.
3699  */
3700 local_variable_type
3701         : primary_expression opt_rank_specifier
3702           {
3703                 // FIXME: Do something smart here regarding the composition of the type.
3704
3705                 // Ok, the above "primary_expression" is there to get rid of
3706                 // both reduce/reduce and shift/reduces in the grammar, it should
3707                 // really just be "type_name".  If you use type_name, a reduce/reduce
3708                 // creeps up.  If you use namespace_or_type_name (which is all we need
3709                 // really) two shift/reduces appear.
3710                 //
3711
3712                 // So the super-trick is that primary_expression
3713                 // can only be either a SimpleName or a MemberAccess.
3714                 // The MemberAccess case arises when you have a fully qualified type-name like :
3715                 // Foo.Bar.Blah i;
3716                 // SimpleName is when you have
3717                 // Blah i;
3718
3719                 Expression expr = (Expression) $1;
3720                 if (!(expr is SimpleName || expr is MemberAccess || expr is ComposedCast || expr is QualifiedAliasMember)) {
3721                         Error_ExpectingTypeName (expr);
3722                         $$ = null;
3723                 } else {
3724                         //
3725                         // So we extract the string corresponding to the SimpleName
3726                         // or MemberAccess
3727                         //
3728
3729                         if ((string) $2 == "")
3730                                 $$ = $1;
3731                         else
3732                                 $$ = new ComposedCast ((Expression) $1, (string) $2);
3733                 }
3734           }
3735         | builtin_types opt_rank_specifier
3736           {
3737                 if ((string) $2 == "")
3738                         $$ = $1;
3739                 else
3740                         $$ = new ComposedCast ((Expression) $1, (string) $2);
3741           }
3742         ;
3743
3744 local_variable_pointer_type
3745         : primary_expression STAR
3746           {
3747                 Expression expr = (Expression) $1;
3748
3749                 if (!(expr is SimpleName || expr is MemberAccess || expr is ComposedCast || expr is QualifiedAliasMember)) {
3750                         Error_ExpectingTypeName (expr);
3751
3752                         $$ = null;
3753                 } else
3754                         $$ = new ComposedCast ((Expression) $1, "*");
3755           }
3756         | builtin_types STAR
3757           {
3758                 $$ = new ComposedCast ((Expression) $1, "*");
3759           }
3760         | VOID STAR
3761           {
3762                 $$ = new ComposedCast (TypeManager.system_void_expr, "*", (Location) $1);
3763           }
3764         | local_variable_pointer_type STAR
3765           {
3766                 $$ = new ComposedCast ((Expression) $1, "*");
3767           }
3768         ;
3769
3770 local_variable_declaration
3771         : local_variable_type variable_declarators
3772           {
3773                 if ($1 != null)
3774                         $$ = new DictionaryEntry ($1, $2);
3775                 else
3776                         $$ = null;
3777           }
3778         | local_variable_pointer_type opt_rank_specifier variable_declarators
3779           {
3780                 if ($1 != null){
3781                         Expression t;
3782
3783                         if ((string) $2 == "")
3784                                 t = (Expression) $1;
3785                         else
3786                                 t = new ComposedCast ((Expression) $1, (string) $2);
3787                         $$ = new DictionaryEntry (t, $3);
3788                 } else
3789                         $$ = null;
3790           }
3791         ;
3792
3793 local_constant_declaration
3794         : CONST local_variable_type constant_declarators
3795           {
3796                 if ($2 != null)
3797                         $$ = new DictionaryEntry ($2, $3);
3798                 else
3799                         $$ = null;
3800           }
3801         ;
3802
3803 expression_statement
3804         : statement_expression SEMICOLON
3805           {
3806                 $$ = $1;
3807           }
3808         ;
3809
3810         //
3811         // We have to do the wrapping here and not in the case above,
3812         // because statement_expression is used for example in for_statement
3813         //
3814 statement_expression
3815         : invocation_expression         { $$ = new StatementExpression ((ExpressionStatement) $1); }
3816         | object_creation_expression    { $$ = new StatementExpression ((ExpressionStatement) $1); }
3817         | assignment_expression         { $$ = new StatementExpression ((ExpressionStatement) $1); }
3818         | post_increment_expression     { $$ = new StatementExpression ((ExpressionStatement) $1); }
3819         | post_decrement_expression     { $$ = new StatementExpression ((ExpressionStatement) $1); }
3820         | pre_increment_expression      { $$ = new StatementExpression ((ExpressionStatement) $1); }
3821         | pre_decrement_expression      { $$ = new StatementExpression ((ExpressionStatement) $1); }
3822         | error {
3823                 Report.Error (1002, GetLocation ($1), "Expecting `;'");
3824                 $$ = null;
3825           }
3826         ;
3827
3828 object_creation_expression
3829         : object_or_delegate_creation_expression
3830           { note ("complain if this is a delegate maybe?"); }
3831         ;
3832
3833 selection_statement
3834         : if_statement
3835         | switch_statement
3836         ;
3837
3838 if_statement
3839         : IF OPEN_PARENS boolean_expression CLOSE_PARENS
3840           embedded_statement
3841           {
3842                 Location l = (Location) $1;
3843
3844                 $$ = new If ((Expression) $3, (Statement) $5, l);
3845
3846                 if (RootContext.WarningLevel >= 3){
3847                         // FIXME: location for warning should be loc property of $5.
3848                         if ($5 == EmptyStatement.Value)
3849                                 Report.Warning (642, l, "Possible mistaken empty statement");
3850                 }
3851
3852           }
3853         | IF OPEN_PARENS boolean_expression CLOSE_PARENS
3854           embedded_statement ELSE embedded_statement
3855           {
3856                 Location l = (Location) $1;
3857
3858                 $$ = new If ((Expression) $3, (Statement) $5, (Statement) $7, l);
3859
3860                 if (RootContext.WarningLevel >= 3){
3861                         // FIXME: location for warning should be loc property of $5 and $7.
3862                         if ($5 == EmptyStatement.Value)
3863                                 Report.Warning (642, l, "Possible mistaken empty statement");
3864                         if ($7 == EmptyStatement.Value)
3865                                 Report.Warning (642, l, "Possible mistaken empty statement");
3866                 }
3867           }
3868         ;
3869
3870 switch_statement
3871         : SWITCH OPEN_PARENS
3872           {
3873                 switch_stack.Push (current_block);
3874           }
3875           expression CLOSE_PARENS
3876           switch_block
3877           {
3878                 $$ = new Switch ((Expression) $4, (ArrayList) $6, (Location) $1);
3879                 current_block = (Block) switch_stack.Pop ();
3880           }
3881         ;
3882
3883 switch_block
3884         : OPEN_BRACE
3885           opt_switch_sections
3886           CLOSE_BRACE
3887           {
3888                 $$ = $2;
3889           }
3890         ;
3891
3892 opt_switch_sections
3893         : /* empty */
3894           {
3895                 Report.Error (1522, lexer.Location, "Empty switch block");
3896           }
3897         | switch_sections
3898         ;
3899
3900 switch_sections
3901         : switch_section
3902           {
3903                 ArrayList sections = new ArrayList (4);
3904
3905                 sections.Add ($1);
3906                 $$ = sections;
3907           }
3908         | switch_sections switch_section
3909           {
3910                 ArrayList sections = (ArrayList) $1;
3911
3912                 sections.Add ($2);
3913                 $$ = sections;
3914           }
3915         ;
3916
3917 switch_section
3918         : switch_labels
3919           {
3920                 current_block = current_block.CreateSwitchBlock (lexer.Location);
3921           }
3922           statement_list
3923           {
3924                 Block topmost = current_block;
3925
3926                 while (topmost.Implicit)
3927                         topmost = topmost.Parent;
3928                 $$ = new SwitchSection ((ArrayList) $1, topmost);
3929           }
3930         ;
3931
3932 switch_labels
3933         : switch_label
3934           {
3935                 ArrayList labels = new ArrayList (4);
3936
3937                 labels.Add ($1);
3938                 $$ = labels;
3939           }
3940         | switch_labels switch_label
3941           {
3942                 ArrayList labels = (ArrayList) ($1);
3943                 labels.Add ($2);
3944
3945                 $$ = labels;
3946           }
3947         ;
3948
3949 switch_label
3950         : CASE constant_expression COLON        { $$ = new SwitchLabel ((Expression) $2, (Location) $1); }
3951         | DEFAULT COLON                         { $$ = new SwitchLabel (null, (Location) $1); }
3952         | error {
3953                 Report.Error (
3954                         1523, GetLocation ($1),
3955                         "The keyword case or default must precede code in switch block");
3956           }
3957         ;
3958
3959 iteration_statement
3960         : while_statement
3961         | do_statement
3962         | for_statement
3963         | foreach_statement
3964         ;
3965
3966 while_statement
3967         : WHILE OPEN_PARENS boolean_expression CLOSE_PARENS embedded_statement
3968           {
3969                 Location l = (Location) $1;
3970                 $$ = new While ((Expression) $3, (Statement) $5, l);
3971           }
3972         ;
3973
3974 do_statement
3975         : DO embedded_statement
3976           WHILE OPEN_PARENS boolean_expression CLOSE_PARENS SEMICOLON
3977           {
3978                 Location l = (Location) $1;
3979
3980                 $$ = new Do ((Statement) $2, (Expression) $5, l);
3981           }
3982         ;
3983
3984 for_statement
3985         : FOR OPEN_PARENS
3986           opt_for_initializer SEMICOLON
3987           {
3988                 Block assign_block = new Block (current_block);
3989                 current_block = assign_block;
3990
3991                 if ($3 is DictionaryEntry){
3992                         DictionaryEntry de = (DictionaryEntry) $3;
3993
3994                         Expression type = (Expression) de.Key;
3995                         ArrayList var_declarators = (ArrayList) de.Value;
3996
3997                         foreach (VariableDeclaration decl in var_declarators){
3998
3999                                 LocalInfo vi;
4000
4001                                 vi = current_block.AddVariable (type, decl.identifier, decl.Location);
4002                                 if (vi == null)
4003                                         continue;
4004
4005                                 Location l = lexer.Location;
4006                                 Expression expr;
4007                                 if (decl.expression_or_array_initializer is Expression){
4008                                         expr = (Expression) decl.expression_or_array_initializer;
4009                                 } else if (decl.expression_or_array_initializer == null) {
4010                                         expr = null;
4011                                 } else {
4012                                         ArrayList init = (ArrayList) decl.expression_or_array_initializer;
4013                                         expr = new ArrayCreation (type, "", init, decl.Location);
4014                                 }
4015
4016                                 LocalVariableReference var;
4017                                 var = new LocalVariableReference (assign_block, decl.identifier, l);
4018
4019                                 if (expr != null) {
4020                                         Assign a = new Assign (var, expr, decl.Location);
4021
4022                                         assign_block.AddStatement (new StatementExpression (a));
4023                                 }
4024                         }
4025
4026                         // Note: the $$ below refers to the value of this code block, not of the LHS non-terminal.
4027                         // This can be referred to as $5 below.
4028                         $$ = null;
4029                 } else {
4030                         $$ = $3;
4031                 }
4032           }
4033           opt_for_condition SEMICOLON
4034           opt_for_iterator CLOSE_PARENS
4035           embedded_statement
4036           {
4037                 Location l = (Location) $1;
4038
4039                 For f = new For ((Statement) $5, (Expression) $6, (Statement) $8, (Statement) $10, l);
4040
4041                 current_block.AddStatement (f);
4042                 while (current_block.Implicit)
4043                         current_block = current_block.Parent;
4044                 $$ = current_block;
4045                 current_block = current_block.Parent;
4046           }
4047         ;
4048
4049 opt_for_initializer
4050         : /* empty */           { $$ = EmptyStatement.Value; }
4051         | for_initializer
4052         ;
4053
4054 for_initializer
4055         : local_variable_declaration
4056         | statement_expression_list
4057         ;
4058
4059 opt_for_condition
4060         : /* empty */           { $$ = null; }
4061         | boolean_expression
4062         ;
4063
4064 opt_for_iterator
4065         : /* empty */           { $$ = EmptyStatement.Value; }
4066         | for_iterator
4067         ;
4068
4069 for_iterator
4070         : statement_expression_list
4071         ;
4072
4073 statement_expression_list
4074         : statement_expression
4075           {
4076                 // CHANGE: was `null'
4077                 Block b = new Block (current_block, Block.Flags.Implicit);
4078
4079                 b.AddStatement ((Statement) $1);
4080                 $$ = b;
4081           }
4082         | statement_expression_list COMMA statement_expression
4083           {
4084                 Block b = (Block) $1;
4085
4086                 b.AddStatement ((Statement) $3);
4087                 $$ = $1;
4088           }
4089         ;
4090
4091 foreach_statement
4092         : FOREACH OPEN_PARENS type IN expression CLOSE_PARENS
4093           {
4094                 Report.Error (230, (Location) $1, "Type and identifier are both required in a foreach statement");
4095                 $$ = null;
4096           }
4097         | FOREACH OPEN_PARENS type IDENTIFIER IN
4098           expression CLOSE_PARENS
4099           {
4100                 Block foreach_block = new Block (current_block);
4101                 current_block = foreach_block;
4102
4103                 LocatedToken lt = (LocatedToken) $4;
4104                 Location l = lt.Location;
4105                 LocalInfo vi;
4106
4107                 vi = foreach_block.AddVariable ((Expression) $3, lt.Value, l);
4108                 if (vi != null) {
4109                         vi.SetReadOnlyContext (LocalInfo.ReadOnlyContext.Foreach);
4110
4111                         // Get a writable reference to this read-only variable.
4112                         //
4113                         // Note that the $$ here refers to the value of _this_ code block,
4114                         // not the value of the LHS non-terminal.  This can be referred to as $8 below.
4115                         $$ = new LocalVariableReference (foreach_block, lt.Value, l, vi, false);
4116                 } else {
4117                         $$ = null;
4118                 }
4119           }
4120           embedded_statement
4121           {
4122                 LocalVariableReference v = (LocalVariableReference) $8;
4123                 Location l = (Location) $1;
4124
4125                 if (v != null) {
4126                         Foreach f = new Foreach ((Expression) $3, v, (Expression) $6, (Statement) $9, l);
4127                         current_block.AddStatement (f);
4128                 }
4129
4130                 while (current_block.Implicit)
4131                           current_block = current_block.Parent;
4132                 $$ = current_block;
4133                 current_block = current_block.Parent;
4134           }
4135         ;
4136
4137 jump_statement
4138         : break_statement
4139         | continue_statement
4140         | goto_statement
4141         | return_statement
4142         | throw_statement
4143         | yield_statement
4144         ;
4145
4146 break_statement
4147         : BREAK SEMICOLON
4148           {
4149                 $$ = new Break ((Location) $1);
4150           }
4151         ;
4152
4153 continue_statement
4154         : CONTINUE SEMICOLON
4155           {
4156                 $$ = new Continue ((Location) $1);
4157           }
4158         ;
4159
4160 goto_statement
4161         : GOTO IDENTIFIER SEMICOLON
4162           {
4163                 LocatedToken lt = (LocatedToken) $2;
4164                 $$ = new Goto (lt.Value, lt.Location);
4165           }
4166         | GOTO CASE constant_expression SEMICOLON
4167           {
4168                 $$ = new GotoCase ((Expression) $3, (Location) $1);
4169           }
4170         | GOTO DEFAULT SEMICOLON
4171           {
4172                 $$ = new GotoDefault ((Location) $1);
4173           }
4174         ;
4175
4176 return_statement
4177         : RETURN opt_expression SEMICOLON
4178           {
4179                 $$ = new Return ((Expression) $2, (Location) $1);
4180           }
4181         ;
4182
4183 throw_statement
4184         : THROW opt_expression SEMICOLON
4185           {
4186                 $$ = new Throw ((Expression) $2, (Location) $1);
4187           }
4188         ;
4189
4190 yield_statement
4191         : IDENTIFIER RETURN expression SEMICOLON
4192           {
4193                 LocatedToken lt = (LocatedToken) $1;
4194                 string s = lt.Value;
4195                 if (s != "yield"){
4196                         Report.Error (1003, lt.Location, "; expected");
4197                         $$ = null;
4198                 }
4199                 if (RootContext.Version == LanguageVersion.ISO_1){
4200                         Report.FeatureIsNotStandardized (lt.Location, "yield statement");
4201                         $$ = null;
4202                 }
4203                 if (iterator_container == null){
4204                         Report.Error (204, lt.Location, "yield statement can only be used within a method, operator or property");
4205                         $$ = null;
4206                 } else {
4207                         iterator_container.SetYields ();
4208                         $$ = new Yield ((Expression) $3, lt.Location);
4209                 }
4210           }
4211         | IDENTIFIER RETURN SEMICOLON
4212           {
4213                 Report.Error (1627, (Location) $2, "Expression expected after yield return");
4214                 $$ = null;
4215           }
4216         | IDENTIFIER BREAK SEMICOLON
4217           {
4218                 LocatedToken lt = (LocatedToken) $1;
4219                 string s = lt.Value;
4220                 if (s != "yield"){
4221                         Report.Error (1003, lt.Location, "; expected");
4222                         $$ = null;
4223                 }
4224                 if (RootContext.Version == LanguageVersion.ISO_1){
4225                         Report.FeatureIsNotStandardized (lt.Location, "yield statement");
4226                         $$ = null;
4227                 }
4228                 if (iterator_container == null){
4229                         Report.Error (204, lt.Location, "yield statement can only be used within a method, operator or property");
4230                         $$ = null;
4231                 } else {
4232                         iterator_container.SetYields ();
4233                         $$ = new YieldBreak (lt.Location);
4234                 }
4235           }
4236         ;
4237
4238 opt_expression
4239         : /* empty */
4240         | expression
4241         ;
4242
4243 try_statement
4244         : TRY block catch_clauses
4245           {
4246                 Catch g = null;
4247
4248                 ArrayList c = (ArrayList)$3;
4249                 for (int i = 0; i < c.Count; ++i) {
4250                         Catch cc = (Catch) c [i];
4251                         if (cc.IsGeneral) {
4252                                 if (i != c.Count - 1)
4253                                         Report.Error (1017, cc.loc, "Try statement already has an empty catch block");
4254                                 g = cc;
4255                                 c.RemoveAt (i);
4256                                 i--;
4257                         }
4258                 }
4259
4260                 // Now s contains the list of specific catch clauses
4261                 // and g contains the general one.
4262
4263                 $$ = new Try ((Block) $2, c, g, null, ((Block) $2).loc);
4264           }
4265         | TRY block opt_catch_clauses FINALLY block
4266           {
4267                 Catch g = null;
4268                 ArrayList s = new ArrayList (4);
4269                 ArrayList catch_list = (ArrayList) $3;
4270
4271                 if (catch_list != null){
4272                         foreach (Catch cc in catch_list) {
4273                                 if (cc.IsGeneral)
4274                                         g = cc;
4275                                 else
4276                                         s.Add (cc);
4277                         }
4278                 }
4279
4280                 $$ = new Try ((Block) $2, s, g, (Block) $5, ((Block) $2).loc);
4281           }
4282         | TRY block error
4283           {
4284                 Report.Error (1524, (Location) $1, "Expected catch or finally");
4285                 $$ = null;
4286           }
4287         ;
4288
4289 opt_catch_clauses
4290         : /* empty */  { $$ = null; }
4291         | catch_clauses
4292         ;
4293
4294 catch_clauses
4295         : catch_clause
4296           {
4297                 ArrayList l = new ArrayList (4);
4298
4299                 l.Add ($1);
4300                 $$ = l;
4301           }
4302         | catch_clauses catch_clause
4303           {
4304                 ArrayList l = (ArrayList) $1;
4305
4306                 l.Add ($2);
4307                 $$ = l;
4308           }
4309         ;
4310
4311 opt_identifier
4312         : /* empty */   { $$ = null; }
4313         | IDENTIFIER
4314         ;
4315
4316 catch_clause
4317         : CATCH opt_catch_args
4318           {
4319                 Expression type = null;
4320
4321                 if ($2 != null) {
4322                         DictionaryEntry cc = (DictionaryEntry) $2;
4323                         type = (Expression) cc.Key;
4324                         LocatedToken lt = (LocatedToken) cc.Value;
4325
4326                         if (lt != null){
4327                                 ArrayList one = new ArrayList (4);
4328
4329                                 one.Add (new VariableDeclaration (lt, null));
4330
4331                                 current_block = new Block (current_block);
4332                                 Block b = declare_local_variables (type, one, lt.Location);
4333                                 current_block = b;
4334                         }
4335                 }
4336           } block {
4337                 Expression type = null;
4338                 string id = null;
4339
4340                 if ($2 != null){
4341                         DictionaryEntry cc = (DictionaryEntry) $2;
4342                         type = (Expression) cc.Key;
4343                         LocatedToken lt = (LocatedToken) cc.Value;
4344
4345                         if (lt != null){
4346                                 id = lt.Value;
4347                                 while (current_block.Implicit)
4348                                         current_block = current_block.Parent;
4349                                 current_block = current_block.Parent;
4350                         }
4351                 }
4352
4353                 $$ = new Catch (type, id, (Block) $4, ((Block) $4).loc);
4354           }
4355         ;
4356
4357 opt_catch_args
4358         : /* empty */ { $$ = null; }
4359         | catch_args
4360         ;
4361
4362 catch_args
4363         : OPEN_PARENS type opt_identifier CLOSE_PARENS
4364           {
4365                 $$ = new DictionaryEntry ($2, $3);
4366           }
4367         ;
4368
4369
4370 checked_statement
4371         : CHECKED block
4372           {
4373                 $$ = new Checked ((Block) $2);
4374           }
4375         ;
4376
4377 unchecked_statement
4378         : UNCHECKED block
4379           {
4380                 $$ = new Unchecked ((Block) $2);
4381           }
4382         ;
4383
4384 unsafe_statement
4385         : UNSAFE
4386           {
4387                 RootContext.CheckUnsafeOption ((Location) $1);
4388           } block {
4389                 $$ = new Unsafe ((Block) $3);
4390           }
4391         ;
4392
4393 fixed_statement
4394         : FIXED OPEN_PARENS
4395           type fixed_pointer_declarators
4396           CLOSE_PARENS
4397           {
4398                 ArrayList list = (ArrayList) $4;
4399                 Expression type = (Expression) $3;
4400                 Location l = (Location) $1;
4401                 int top = list.Count;
4402
4403                 Block assign_block = new Block (current_block);
4404                 current_block = assign_block;
4405
4406                 for (int i = 0; i < top; i++){
4407                         Pair p = (Pair) list [i];
4408                         LocalInfo v;
4409
4410                         v = current_block.AddVariable (type, (string) p.First, l);
4411                         if (v == null)
4412                                 continue;
4413
4414                         v.SetReadOnlyContext (LocalInfo.ReadOnlyContext.Fixed);
4415                         v.Pinned = true;
4416                         p.First = v;
4417                         list [i] = p;
4418                 }
4419           }
4420           embedded_statement
4421           {
4422                 Location l = (Location) $1;
4423
4424                 Fixed f = new Fixed ((Expression) $3, (ArrayList) $4, (Statement) $7, l);
4425
4426                 current_block.AddStatement (f);
4427                 while (current_block.Implicit)
4428                         current_block = current_block.Parent;
4429                 $$ = current_block;
4430                 current_block = current_block.Parent;
4431           }
4432         ;
4433
4434 fixed_pointer_declarators
4435         : fixed_pointer_declarator      {
4436                 ArrayList declarators = new ArrayList (4);
4437                 if ($1 != null)
4438                         declarators.Add ($1);
4439                 $$ = declarators;
4440           }
4441         | fixed_pointer_declarators COMMA fixed_pointer_declarator
4442           {
4443                 ArrayList declarators = (ArrayList) $1;
4444                 if ($3 != null)
4445                         declarators.Add ($3);
4446                 $$ = declarators;
4447           }
4448         ;
4449
4450 fixed_pointer_declarator
4451         : IDENTIFIER ASSIGN expression
4452           {
4453                 LocatedToken lt = (LocatedToken) $1;
4454                 // FIXME: keep location
4455                 $$ = new Pair (lt.Value, $3);
4456           }
4457         | IDENTIFIER
4458           {
4459                 Report.Error (210, ((LocatedToken) $1).Location, "You must provide an initializer in a fixed or using statement declaration");
4460                 $$ = null;
4461           }
4462         ;
4463
4464 lock_statement
4465         : LOCK OPEN_PARENS expression CLOSE_PARENS
4466           {
4467                 //
4468           }
4469           embedded_statement
4470           {
4471                 $$ = new Lock ((Expression) $3, (Statement) $6, (Location) $1);
4472           }
4473         ;
4474
4475 using_statement
4476         : USING OPEN_PARENS resource_acquisition CLOSE_PARENS
4477           {
4478                 Block assign_block = new Block (current_block);
4479                 current_block = assign_block;
4480
4481                 if ($3 is DictionaryEntry){
4482                         DictionaryEntry de = (DictionaryEntry) $3;
4483                         Location l = (Location) $1;
4484
4485                         Expression type = (Expression) de.Key;
4486                         ArrayList var_declarators = (ArrayList) de.Value;
4487
4488                         ArrayList vars = new ArrayList (4);
4489
4490                         foreach (VariableDeclaration decl in var_declarators){
4491
4492                                 LocalInfo vi = current_block.AddVariable (type, decl.identifier, decl.Location);
4493                                 if (vi == null)
4494                                         continue;
4495                                 vi.SetReadOnlyContext (LocalInfo.ReadOnlyContext.Using);
4496
4497                                 Expression expr;
4498                                 if (decl.expression_or_array_initializer is Expression){
4499                                         expr = (Expression) decl.expression_or_array_initializer;
4500                                 } else {
4501                                         ArrayList init = (ArrayList) decl.expression_or_array_initializer;
4502                                         if (init == null) {
4503                                                 Report.Error (210, l, "You must provide an initializer in a fixed or using statement declaration");
4504                                         }
4505
4506                                         expr = new ArrayCreation (type, "", init, decl.Location);
4507                                 }
4508
4509                                 LocalVariableReference var;
4510
4511                                 // Get a writable reference to this read-only variable.
4512                                 var = new LocalVariableReference (assign_block, decl.identifier, l, vi, false);
4513
4514                                 // This is so that it is not a warning on using variables
4515                                 vi.Used = true;
4516
4517                                 vars.Add (new DictionaryEntry (var, expr));
4518
4519                                 // Assign a = new Assign (var, expr, decl.Location);
4520                                 // assign_block.AddStatement (new StatementExpression (a));
4521                         }
4522
4523                         // Note: the $$ here refers to the value of this code block and not of the LHS non-terminal.
4524                         // It can be referred to as $5 below.
4525                         $$ = new DictionaryEntry (type, vars);
4526                  } else {
4527                         $$ = $3;
4528                  }
4529           }
4530           embedded_statement
4531           {
4532                 Using u = new Using ($5, (Statement) $6, (Location) $1);
4533                 current_block.AddStatement (u);
4534                 while (current_block.Implicit)
4535                         current_block = current_block.Parent;
4536                 $$ = current_block;
4537                 current_block = current_block.Parent;
4538           }
4539         ;
4540
4541 resource_acquisition
4542         : local_variable_declaration
4543         | expression
4544         ;
4545
4546 %%
4547
4548 // <summary>
4549 //   A class used to pass around variable declarations and constants
4550 // </summary>
4551 public class VariableDeclaration {
4552         public string identifier;
4553         public object expression_or_array_initializer;
4554         public Location Location;
4555         public Attributes OptAttributes;
4556         public string DocComment;
4557
4558         public VariableDeclaration (LocatedToken lt, object eoai, Attributes opt_attrs)
4559         {
4560                 this.identifier = lt.Value;
4561                 this.expression_or_array_initializer = eoai;
4562                 this.Location = lt.Location;
4563                 this.OptAttributes = opt_attrs;
4564         }
4565
4566         public VariableDeclaration (LocatedToken lt, object eoai) : this (lt, eoai, null)
4567         {
4568         }
4569 }
4570
4571 /// <summary>
4572 ///  Used to pass around interface property information
4573 /// </summary>
4574 public class InterfaceAccessorInfo {
4575
4576         public readonly Accessor Get, Set;
4577
4578         public InterfaceAccessorInfo (bool has_get, bool has_set,
4579                                       Attributes get_attrs, Attributes set_attrs, int get_mod, int set_mod, Location get_loc, Location set_loc)
4580         {
4581                 if (has_get)
4582                         Get = new Accessor (null, get_mod, get_attrs, get_loc);
4583                 if (has_set)
4584                         Set = new Accessor (null, set_mod, set_attrs, set_loc);
4585         }
4586
4587 }
4588
4589
4590 // <summary>
4591 //   A class used to hold info about an indexer declarator
4592 // </summary>
4593 public class IndexerDeclaration {
4594         public Expression type;
4595         public MemberName interface_type;
4596         public Parameters param_list;
4597         public Location location;
4598
4599         public IndexerDeclaration (Expression type, MemberName interface_type,
4600                                    Parameters param_list, Location loc)
4601         {
4602                 this.type = type;
4603                 this.interface_type = interface_type;
4604                 this.param_list = param_list;
4605                 this.location = loc;
4606         }
4607 }
4608
4609 //
4610 // We use this when we do not have an object in advance that is an IIteratorContainer
4611 //
4612 public class SimpleIteratorContainer : IIteratorContainer {
4613         public bool Yields;
4614
4615         public static SimpleIteratorContainer Simple = new SimpleIteratorContainer ();
4616
4617         //
4618         // Reset and return
4619         //
4620         public static SimpleIteratorContainer GetSimple () {
4621                 Simple.Yields = false;
4622                 return Simple;
4623         }
4624
4625         public void SetYields () { Yields = true; }
4626 }
4627
4628 // <summary>
4629 //  A class used to hold info about an operator declarator
4630 // </summary>
4631 public class OperatorDeclaration {
4632         public Operator.OpType optype;
4633         public Expression ret_type, arg1type, arg2type;
4634         public string arg1name, arg2name;
4635         public Location location;
4636
4637         public OperatorDeclaration (Operator.OpType op, Expression ret_type,
4638                                     Expression arg1type, string arg1name,
4639                                     Expression arg2type, string arg2name, Location location)
4640         {
4641                 optype = op;
4642                 this.ret_type = ret_type;
4643                 this.arg1type = arg1type;
4644                 this.arg1name = arg1name;
4645                 this.arg2type = arg2type;
4646                 this.arg2name = arg2name;
4647                 this.location = location;
4648         }
4649
4650 }
4651
4652 void Error_ExpectingTypeName (Expression expr)
4653 {
4654         if (expr is Invocation){
4655                 Report.Error (1002, expr.Location, "Expecting `;'");
4656         } else {
4657                 Report.Error (-1, expr.Location, "Invalid Type definition");
4658         }
4659 }
4660
4661 TypeContainer pop_current_class ()
4662 {
4663         TypeContainer retval = current_class;
4664
4665         current_class = current_class.Parent;
4666         current_container = current_container.Parent;
4667
4668         if (current_class != current_container) {
4669                 if (!(current_class is ClassPart) ||
4670                     ((ClassPart) current_class).PartialContainer != current_container)
4671                         throw new InternalErrorException ();
4672         } else if (current_container is ClassPart)
4673                 current_container = ((ClassPart) current_class).PartialContainer;
4674
4675         return retval;
4676 }
4677
4678 // <summary>
4679 //   Given the @class_name name, it creates a fully qualified name
4680 //   based on the containing declaration space
4681 // </summary>
4682 MemberName
4683 MakeName (MemberName class_name)
4684 {
4685         Namespace ns = current_namespace.NS;
4686
4687         if (current_container.Name == ""){
4688                 if (ns.Name != "")
4689                         return new MemberName (ns.MemberName, class_name);
4690                 else
4691                         return class_name;
4692         } else {
4693                 return new MemberName (current_container.MemberName, class_name);
4694         }
4695 }
4696
4697 Block declare_local_variables (Expression type, ArrayList variable_declarators, Location loc)
4698 {
4699         Block implicit_block;
4700         ArrayList inits = null;
4701
4702         //
4703         // We use the `Used' property to check whether statements
4704         // have been added to the current block.  If so, we need
4705         // to create another block to contain the new declaration
4706         // otherwise, as an optimization, we use the same block to
4707         // add the declaration.
4708         //
4709         // FIXME: A further optimization is to check if the statements
4710         // that were added were added as part of the initialization
4711         // below.  In which case, no other statements have been executed
4712         // and we might be able to reduce the number of blocks for
4713         // situations like this:
4714         //
4715         // int j = 1;  int k = j + 1;
4716         //
4717         if (current_block.Used)
4718                 implicit_block = new Block (current_block, Block.Flags.Implicit, loc, Location.Null);
4719         else
4720                 implicit_block = current_block;
4721
4722         foreach (VariableDeclaration decl in variable_declarators){
4723
4724                 if (implicit_block.AddVariable (type, decl.identifier, decl.Location) != null) {
4725                         if (decl.expression_or_array_initializer != null){
4726                                 if (inits == null)
4727                                         inits = new ArrayList (4);
4728                                 inits.Add (decl);
4729                         }
4730                 }
4731         }
4732
4733         if (inits == null)
4734                 return implicit_block;
4735
4736         foreach (VariableDeclaration decl in inits){
4737                 Assign assign;
4738                 Expression expr;
4739
4740                 if (decl.expression_or_array_initializer is Expression){
4741                         expr = (Expression) decl.expression_or_array_initializer;
4742
4743                 } else {
4744                         ArrayList init = (ArrayList) decl.expression_or_array_initializer;
4745
4746                         expr = new ArrayCreation (type, "", init, decl.Location);
4747                 }
4748
4749                 LocalVariableReference var;
4750                 var = new LocalVariableReference (implicit_block, decl.identifier, loc);
4751
4752                 assign = new Assign (var, expr, decl.Location);
4753
4754                 implicit_block.AddStatement (new StatementExpression (assign));
4755         }
4756
4757         return implicit_block;
4758 }
4759
4760 Block declare_local_constants (Expression type, ArrayList declarators)
4761 {
4762         Block implicit_block;
4763
4764         if (current_block.Used)
4765                 implicit_block = new Block (current_block, Block.Flags.Implicit);
4766         else
4767                 implicit_block = current_block;
4768
4769         foreach (VariableDeclaration decl in declarators){
4770                 implicit_block.AddConstant (type, decl.identifier, (Expression) decl.expression_or_array_initializer, decl.Location);
4771         }
4772
4773         return implicit_block;
4774 }
4775
4776 void CheckAttributeTarget (string a, Location l)
4777 {
4778         switch (a) {
4779
4780         case "assembly" : case "module" : case "field" : case "method" : case "param" : case "property" : case "type" :
4781                 return;
4782
4783         default :
4784                 Report.Error (658, l, "`" + a + "' is an invalid attribute target");
4785                 break;
4786         }
4787
4788 }
4789
4790 void CheckUnaryOperator (Operator.OpType op, Location l)
4791 {
4792         switch (op) {
4793
4794         case Operator.OpType.LogicalNot:
4795         case Operator.OpType.OnesComplement:
4796         case Operator.OpType.Increment:
4797         case Operator.OpType.Decrement:
4798         case Operator.OpType.True:
4799         case Operator.OpType.False:
4800         case Operator.OpType.Addition:
4801         case Operator.OpType.Subtraction:
4802
4803                 break;
4804
4805         default :
4806                 Report.Error (1019, l, "Overloadable unary operator expected");
4807                 break;
4808
4809         }
4810 }
4811
4812 void CheckBinaryOperator (Operator.OpType op, Location l)
4813 {
4814         switch (op) {
4815
4816         case Operator.OpType.Addition:
4817         case Operator.OpType.Subtraction:
4818         case Operator.OpType.Multiply:
4819         case Operator.OpType.Division:
4820         case Operator.OpType.Modulus:
4821         case Operator.OpType.BitwiseAnd:
4822         case Operator.OpType.BitwiseOr:
4823         case Operator.OpType.ExclusiveOr:
4824         case Operator.OpType.LeftShift:
4825         case Operator.OpType.RightShift:
4826         case Operator.OpType.Equality:
4827         case Operator.OpType.Inequality:
4828         case Operator.OpType.GreaterThan:
4829         case Operator.OpType.LessThan:
4830         case Operator.OpType.GreaterThanOrEqual:
4831         case Operator.OpType.LessThanOrEqual:
4832                 break;
4833
4834         default :
4835                 Report.Error (1020, l, "Overloadable binary operator expected");
4836                 break;
4837         }
4838
4839 }
4840
4841 void syntax_error (Location l, string msg)
4842 {
4843         Report.Error (1003, l, "Syntax error, " + msg);
4844 }
4845
4846 void note (string s)
4847 {
4848         // Used to put annotations
4849 }
4850
4851 Tokenizer lexer;
4852
4853 public Tokenizer Lexer {
4854         get {
4855                 return lexer;
4856         }
4857 }
4858
4859 public CSharpParser (StreamReader reader, SourceFile file, ArrayList defines)
4860 {
4861         current_namespace = new NamespaceEntry (null, file, null, Location.Null);
4862         this.name = file.Name;
4863         this.file = file;
4864         current_container = RootContext.Tree.Types;
4865         // TODO: Make RootContext.Tree.Types a PartialContainer.
4866         current_class = current_container;
4867         current_container.NamespaceEntry = current_namespace;
4868         oob_stack = new Stack ();
4869         switch_stack = new Stack ();
4870
4871         lexer = new Tokenizer (reader, file, defines);
4872 }
4873
4874 public void parse ()
4875 {
4876         try {
4877                 if (yacc_verbose_flag > 1)
4878                         yyparse (lexer, new yydebug.yyDebugSimple ());
4879                 else
4880                         yyparse (lexer);
4881                 Tokenizer tokenizer = lexer as Tokenizer;
4882                 tokenizer.cleanup ();
4883         } catch (Exception e){
4884                 //
4885                 // Removed for production use, use parser verbose to get the output.
4886                 //
4887                 // Console.WriteLine (e);
4888                 Report.Error (-25, lexer.Location, "Parsing error");
4889                 if (yacc_verbose_flag > 0)
4890                         Console.WriteLine (e);
4891         }
4892
4893         RootContext.Tree.Types.NamespaceEntry = null;
4894 }
4895
4896 void CheckToken (int error, int yyToken, string msg, Location loc)
4897 {
4898         if (yyToken >= Token.FIRST_KEYWORD && yyToken <= Token.LAST_KEYWORD){
4899                 Report.Error (error, loc, String.Format ("{0}: `{1}' is a keyword", msg, yyNames [yyToken].ToLower ()));
4900                 return;
4901         }
4902         Report.Error (error, loc, msg);
4903 }
4904
4905 void CheckIdentifierToken (int yyToken, Location loc)
4906 {
4907         CheckToken (1041, yyToken, "Identifier expected", loc);
4908 }
4909
4910 string ConsumeStoredComment ()
4911 {
4912         string s = tmpComment;
4913         tmpComment = null;
4914         Lexer.doc_state = XmlCommentState.Allowed;
4915         return s;
4916 }
4917
4918 Location GetLocation (object obj)
4919 {
4920         if (obj is MemberCore)
4921                 return ((MemberCore) obj).Location;
4922         if (obj is MemberName)
4923                 return ((MemberName) obj).Location;
4924         if (obj is LocatedToken)
4925                 return ((LocatedToken) obj).Location;
4926         if (obj is Location)
4927                 return (Location) obj;
4928         return lexer.Location;
4929 }
4930
4931 /* end end end */
4932 }