1 //===--- ParseDecl.cpp - Declaration Parsing ------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the Declaration portions of the Parser interfaces. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Parse/Parser.h" 15 #include "RAIIObjectsForParser.h" 16 #include "clang/AST/ASTContext.h" 17 #include "clang/AST/DeclTemplate.h" 18 #include "clang/Basic/AddressSpaces.h" 19 #include "clang/Basic/Attributes.h" 20 #include "clang/Basic/CharInfo.h" 21 #include "clang/Basic/TargetInfo.h" 22 #include "clang/Parse/ParseDiagnostic.h" 23 #include "clang/Sema/Lookup.h" 24 #include "clang/Sema/ParsedTemplate.h" 25 #include "clang/Sema/PrettyDeclStackTrace.h" 26 #include "clang/Sema/Scope.h" 27 #include "llvm/ADT/SmallSet.h" 28 #include "llvm/ADT/SmallString.h" 29 #include "llvm/ADT/StringSwitch.h" 30 using namespace clang; 31 32 //===----------------------------------------------------------------------===// 33 // C99 6.7: Declarations. 34 //===----------------------------------------------------------------------===// 35 36 /// ParseTypeName 37 /// type-name: [C99 6.7.6] 38 /// specifier-qualifier-list abstract-declarator[opt] 39 /// 40 /// Called type-id in C++. 41 TypeResult Parser::ParseTypeName(SourceRange *Range, 42 Declarator::TheContext Context, 43 AccessSpecifier AS, 44 Decl **OwnedType, 45 ParsedAttributes *Attrs) { 46 DeclSpecContext DSC = getDeclSpecContextFromDeclaratorContext(Context); 47 if (DSC == DSC_normal) 48 DSC = DSC_type_specifier; 49 50 // Parse the common declaration-specifiers piece. 51 DeclSpec DS(AttrFactory); 52 if (Attrs) 53 DS.addAttributes(Attrs->getList()); 54 ParseSpecifierQualifierList(DS, AS, DSC); 55 if (OwnedType) 56 *OwnedType = DS.isTypeSpecOwned() ? DS.getRepAsDecl() : nullptr; 57 58 // Parse the abstract-declarator, if present. 59 Declarator DeclaratorInfo(DS, Context); 60 ParseDeclarator(DeclaratorInfo); 61 if (Range) 62 *Range = DeclaratorInfo.getSourceRange(); 63 64 if (DeclaratorInfo.isInvalidType()) 65 return true; 66 67 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 68 } 69 70 71 /// isAttributeLateParsed - Return true if the attribute has arguments that 72 /// require late parsing. 73 static bool isAttributeLateParsed(const IdentifierInfo &II) { 74 #define CLANG_ATTR_LATE_PARSED_LIST 75 return llvm::StringSwitch<bool>(II.getName()) 76 #include "clang/Parse/AttrParserStringSwitches.inc" 77 .Default(false); 78 #undef CLANG_ATTR_LATE_PARSED_LIST 79 } 80 81 /// ParseGNUAttributes - Parse a non-empty attributes list. 82 /// 83 /// [GNU] attributes: 84 /// attribute 85 /// attributes attribute 86 /// 87 /// [GNU] attribute: 88 /// '__attribute__' '(' '(' attribute-list ')' ')' 89 /// 90 /// [GNU] attribute-list: 91 /// attrib 92 /// attribute_list ',' attrib 93 /// 94 /// [GNU] attrib: 95 /// empty 96 /// attrib-name 97 /// attrib-name '(' identifier ')' 98 /// attrib-name '(' identifier ',' nonempty-expr-list ')' 99 /// attrib-name '(' argument-expression-list [C99 6.5.2] ')' 100 /// 101 /// [GNU] attrib-name: 102 /// identifier 103 /// typespec 104 /// typequal 105 /// storageclass 106 /// 107 /// Whether an attribute takes an 'identifier' is determined by the 108 /// attrib-name. GCC's behavior here is not worth imitating: 109 /// 110 /// * In C mode, if the attribute argument list starts with an identifier 111 /// followed by a ',' or an ')', and the identifier doesn't resolve to 112 /// a type, it is parsed as an identifier. If the attribute actually 113 /// wanted an expression, it's out of luck (but it turns out that no 114 /// attributes work that way, because C constant expressions are very 115 /// limited). 116 /// * In C++ mode, if the attribute argument list starts with an identifier, 117 /// and the attribute *wants* an identifier, it is parsed as an identifier. 118 /// At block scope, any additional tokens between the identifier and the 119 /// ',' or ')' are ignored, otherwise they produce a parse error. 120 /// 121 /// We follow the C++ model, but don't allow junk after the identifier. 122 void Parser::ParseGNUAttributes(ParsedAttributes &attrs, 123 SourceLocation *endLoc, 124 LateParsedAttrList *LateAttrs, 125 Declarator *D) { 126 assert(Tok.is(tok::kw___attribute) && "Not a GNU attribute list!"); 127 128 while (Tok.is(tok::kw___attribute)) { 129 ConsumeToken(); 130 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 131 "attribute")) { 132 SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ; 133 return; 134 } 135 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) { 136 SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ; 137 return; 138 } 139 // Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") )) 140 while (true) { 141 // Allow empty/non-empty attributes. ((__vector_size__(16),,,,)) 142 if (TryConsumeToken(tok::comma)) 143 continue; 144 145 // Expect an identifier or declaration specifier (const, int, etc.) 146 if (Tok.isAnnotation()) 147 break; 148 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 149 if (!AttrName) 150 break; 151 152 SourceLocation AttrNameLoc = ConsumeToken(); 153 154 if (Tok.isNot(tok::l_paren)) { 155 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0, 156 AttributeList::AS_GNU); 157 continue; 158 } 159 160 // Handle "parameterized" attributes 161 if (!LateAttrs || !isAttributeLateParsed(*AttrName)) { 162 ParseGNUAttributeArgs(AttrName, AttrNameLoc, attrs, endLoc, nullptr, 163 SourceLocation(), AttributeList::AS_GNU, D); 164 continue; 165 } 166 167 // Handle attributes with arguments that require late parsing. 168 LateParsedAttribute *LA = 169 new LateParsedAttribute(this, *AttrName, AttrNameLoc); 170 LateAttrs->push_back(LA); 171 172 // Attributes in a class are parsed at the end of the class, along 173 // with other late-parsed declarations. 174 if (!ClassStack.empty() && !LateAttrs->parseSoon()) 175 getCurrentClass().LateParsedDeclarations.push_back(LA); 176 177 // consume everything up to and including the matching right parens 178 ConsumeAndStoreUntil(tok::r_paren, LA->Toks, true, false); 179 180 Token Eof; 181 Eof.startToken(); 182 Eof.setLocation(Tok.getLocation()); 183 LA->Toks.push_back(Eof); 184 } 185 186 if (ExpectAndConsume(tok::r_paren)) 187 SkipUntil(tok::r_paren, StopAtSemi); 188 SourceLocation Loc = Tok.getLocation(); 189 if (ExpectAndConsume(tok::r_paren)) 190 SkipUntil(tok::r_paren, StopAtSemi); 191 if (endLoc) 192 *endLoc = Loc; 193 } 194 } 195 196 /// \brief Normalizes an attribute name by dropping prefixed and suffixed __. 197 static StringRef normalizeAttrName(StringRef Name) { 198 if (Name.size() >= 4 && Name.startswith("__") && Name.endswith("__")) 199 Name = Name.drop_front(2).drop_back(2); 200 return Name; 201 } 202 203 /// \brief Determine whether the given attribute has an identifier argument. 204 static bool attributeHasIdentifierArg(const IdentifierInfo &II) { 205 #define CLANG_ATTR_IDENTIFIER_ARG_LIST 206 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName())) 207 #include "clang/Parse/AttrParserStringSwitches.inc" 208 .Default(false); 209 #undef CLANG_ATTR_IDENTIFIER_ARG_LIST 210 } 211 212 /// \brief Determine whether the given attribute parses a type argument. 213 static bool attributeIsTypeArgAttr(const IdentifierInfo &II) { 214 #define CLANG_ATTR_TYPE_ARG_LIST 215 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName())) 216 #include "clang/Parse/AttrParserStringSwitches.inc" 217 .Default(false); 218 #undef CLANG_ATTR_TYPE_ARG_LIST 219 } 220 221 /// \brief Determine whether the given attribute requires parsing its arguments 222 /// in an unevaluated context or not. 223 static bool attributeParsedArgsUnevaluated(const IdentifierInfo &II) { 224 #define CLANG_ATTR_ARG_CONTEXT_LIST 225 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName())) 226 #include "clang/Parse/AttrParserStringSwitches.inc" 227 .Default(false); 228 #undef CLANG_ATTR_ARG_CONTEXT_LIST 229 } 230 231 IdentifierLoc *Parser::ParseIdentifierLoc() { 232 assert(Tok.is(tok::identifier) && "expected an identifier"); 233 IdentifierLoc *IL = IdentifierLoc::create(Actions.Context, 234 Tok.getLocation(), 235 Tok.getIdentifierInfo()); 236 ConsumeToken(); 237 return IL; 238 } 239 240 void Parser::ParseAttributeWithTypeArg(IdentifierInfo &AttrName, 241 SourceLocation AttrNameLoc, 242 ParsedAttributes &Attrs, 243 SourceLocation *EndLoc, 244 IdentifierInfo *ScopeName, 245 SourceLocation ScopeLoc, 246 AttributeList::Syntax Syntax) { 247 BalancedDelimiterTracker Parens(*this, tok::l_paren); 248 Parens.consumeOpen(); 249 250 TypeResult T; 251 if (Tok.isNot(tok::r_paren)) 252 T = ParseTypeName(); 253 254 if (Parens.consumeClose()) 255 return; 256 257 if (T.isInvalid()) 258 return; 259 260 if (T.isUsable()) 261 Attrs.addNewTypeAttr(&AttrName, 262 SourceRange(AttrNameLoc, Parens.getCloseLocation()), 263 ScopeName, ScopeLoc, T.get(), Syntax); 264 else 265 Attrs.addNew(&AttrName, SourceRange(AttrNameLoc, Parens.getCloseLocation()), 266 ScopeName, ScopeLoc, nullptr, 0, Syntax); 267 } 268 269 unsigned Parser::ParseAttributeArgsCommon( 270 IdentifierInfo *AttrName, SourceLocation AttrNameLoc, 271 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName, 272 SourceLocation ScopeLoc, AttributeList::Syntax Syntax) { 273 // Ignore the left paren location for now. 274 ConsumeParen(); 275 276 ArgsVector ArgExprs; 277 if (Tok.is(tok::identifier)) { 278 // If this attribute wants an 'identifier' argument, make it so. 279 bool IsIdentifierArg = attributeHasIdentifierArg(*AttrName); 280 AttributeList::Kind AttrKind = 281 AttributeList::getKind(AttrName, ScopeName, Syntax); 282 283 // If we don't know how to parse this attribute, but this is the only 284 // token in this argument, assume it's meant to be an identifier. 285 if (AttrKind == AttributeList::UnknownAttribute || 286 AttrKind == AttributeList::IgnoredAttribute) { 287 const Token &Next = NextToken(); 288 IsIdentifierArg = Next.is(tok::r_paren) || Next.is(tok::comma); 289 } 290 291 if (IsIdentifierArg) 292 ArgExprs.push_back(ParseIdentifierLoc()); 293 } 294 295 if (!ArgExprs.empty() ? Tok.is(tok::comma) : Tok.isNot(tok::r_paren)) { 296 // Eat the comma. 297 if (!ArgExprs.empty()) 298 ConsumeToken(); 299 300 // Parse the non-empty comma-separated list of expressions. 301 do { 302 std::unique_ptr<EnterExpressionEvaluationContext> Unevaluated; 303 if (attributeParsedArgsUnevaluated(*AttrName)) 304 Unevaluated.reset( 305 new EnterExpressionEvaluationContext(Actions, Sema::Unevaluated)); 306 307 ExprResult ArgExpr( 308 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression())); 309 if (ArgExpr.isInvalid()) { 310 SkipUntil(tok::r_paren, StopAtSemi); 311 return 0; 312 } 313 ArgExprs.push_back(ArgExpr.get()); 314 // Eat the comma, move to the next argument 315 } while (TryConsumeToken(tok::comma)); 316 } 317 318 SourceLocation RParen = Tok.getLocation(); 319 if (!ExpectAndConsume(tok::r_paren)) { 320 SourceLocation AttrLoc = ScopeLoc.isValid() ? ScopeLoc : AttrNameLoc; 321 Attrs.addNew(AttrName, SourceRange(AttrLoc, RParen), ScopeName, ScopeLoc, 322 ArgExprs.data(), ArgExprs.size(), Syntax); 323 } 324 325 if (EndLoc) 326 *EndLoc = RParen; 327 328 return static_cast<unsigned>(ArgExprs.size()); 329 } 330 331 /// Parse the arguments to a parameterized GNU attribute or 332 /// a C++11 attribute in "gnu" namespace. 333 void Parser::ParseGNUAttributeArgs(IdentifierInfo *AttrName, 334 SourceLocation AttrNameLoc, 335 ParsedAttributes &Attrs, 336 SourceLocation *EndLoc, 337 IdentifierInfo *ScopeName, 338 SourceLocation ScopeLoc, 339 AttributeList::Syntax Syntax, 340 Declarator *D) { 341 342 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('"); 343 344 AttributeList::Kind AttrKind = 345 AttributeList::getKind(AttrName, ScopeName, Syntax); 346 347 if (AttrKind == AttributeList::AT_Availability) { 348 ParseAvailabilityAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName, 349 ScopeLoc, Syntax); 350 return; 351 } else if (AttrKind == AttributeList::AT_ObjCBridgeRelated) { 352 ParseObjCBridgeRelatedAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, 353 ScopeName, ScopeLoc, Syntax); 354 return; 355 } else if (AttrKind == AttributeList::AT_TypeTagForDatatype) { 356 ParseTypeTagForDatatypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, 357 ScopeName, ScopeLoc, Syntax); 358 return; 359 } else if (attributeIsTypeArgAttr(*AttrName)) { 360 ParseAttributeWithTypeArg(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName, 361 ScopeLoc, Syntax); 362 return; 363 } 364 365 // These may refer to the function arguments, but need to be parsed early to 366 // participate in determining whether it's a redeclaration. 367 std::unique_ptr<ParseScope> PrototypeScope; 368 if (AttrName->isStr("enable_if") && D && D->isFunctionDeclarator()) { 369 DeclaratorChunk::FunctionTypeInfo FTI = D->getFunctionTypeInfo(); 370 PrototypeScope.reset(new ParseScope(this, Scope::FunctionPrototypeScope | 371 Scope::FunctionDeclarationScope | 372 Scope::DeclScope)); 373 for (unsigned i = 0; i != FTI.NumParams; ++i) { 374 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param); 375 Actions.ActOnReenterCXXMethodParameter(getCurScope(), Param); 376 } 377 } 378 379 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName, 380 ScopeLoc, Syntax); 381 } 382 383 bool Parser::ParseMicrosoftDeclSpecArgs(IdentifierInfo *AttrName, 384 SourceLocation AttrNameLoc, 385 ParsedAttributes &Attrs) { 386 // If the attribute isn't known, we will not attempt to parse any 387 // arguments. 388 if (!hasAttribute(AttrSyntax::Declspec, nullptr, AttrName, 389 getTargetInfo().getTriple(), getLangOpts())) { 390 // Eat the left paren, then skip to the ending right paren. 391 ConsumeParen(); 392 SkipUntil(tok::r_paren); 393 return false; 394 } 395 396 SourceLocation OpenParenLoc = Tok.getLocation(); 397 398 if (AttrName->getName() == "property") { 399 // The property declspec is more complex in that it can take one or two 400 // assignment expressions as a parameter, but the lhs of the assignment 401 // must be named get or put. 402 403 BalancedDelimiterTracker T(*this, tok::l_paren); 404 T.expectAndConsume(diag::err_expected_lparen_after, 405 AttrName->getNameStart(), tok::r_paren); 406 407 enum AccessorKind { 408 AK_Invalid = -1, 409 AK_Put = 0, 410 AK_Get = 1 // indices into AccessorNames 411 }; 412 IdentifierInfo *AccessorNames[] = {nullptr, nullptr}; 413 bool HasInvalidAccessor = false; 414 415 // Parse the accessor specifications. 416 while (true) { 417 // Stop if this doesn't look like an accessor spec. 418 if (!Tok.is(tok::identifier)) { 419 // If the user wrote a completely empty list, use a special diagnostic. 420 if (Tok.is(tok::r_paren) && !HasInvalidAccessor && 421 AccessorNames[AK_Put] == nullptr && 422 AccessorNames[AK_Get] == nullptr) { 423 Diag(AttrNameLoc, diag::err_ms_property_no_getter_or_putter); 424 break; 425 } 426 427 Diag(Tok.getLocation(), diag::err_ms_property_unknown_accessor); 428 break; 429 } 430 431 AccessorKind Kind; 432 SourceLocation KindLoc = Tok.getLocation(); 433 StringRef KindStr = Tok.getIdentifierInfo()->getName(); 434 if (KindStr == "get") { 435 Kind = AK_Get; 436 } else if (KindStr == "put") { 437 Kind = AK_Put; 438 439 // Recover from the common mistake of using 'set' instead of 'put'. 440 } else if (KindStr == "set") { 441 Diag(KindLoc, diag::err_ms_property_has_set_accessor) 442 << FixItHint::CreateReplacement(KindLoc, "put"); 443 Kind = AK_Put; 444 445 // Handle the mistake of forgetting the accessor kind by skipping 446 // this accessor. 447 } else if (NextToken().is(tok::comma) || NextToken().is(tok::r_paren)) { 448 Diag(KindLoc, diag::err_ms_property_missing_accessor_kind); 449 ConsumeToken(); 450 HasInvalidAccessor = true; 451 goto next_property_accessor; 452 453 // Otherwise, complain about the unknown accessor kind. 454 } else { 455 Diag(KindLoc, diag::err_ms_property_unknown_accessor); 456 HasInvalidAccessor = true; 457 Kind = AK_Invalid; 458 459 // Try to keep parsing unless it doesn't look like an accessor spec. 460 if (!NextToken().is(tok::equal)) 461 break; 462 } 463 464 // Consume the identifier. 465 ConsumeToken(); 466 467 // Consume the '='. 468 if (!TryConsumeToken(tok::equal)) { 469 Diag(Tok.getLocation(), diag::err_ms_property_expected_equal) 470 << KindStr; 471 break; 472 } 473 474 // Expect the method name. 475 if (!Tok.is(tok::identifier)) { 476 Diag(Tok.getLocation(), diag::err_ms_property_expected_accessor_name); 477 break; 478 } 479 480 if (Kind == AK_Invalid) { 481 // Just drop invalid accessors. 482 } else if (AccessorNames[Kind] != nullptr) { 483 // Complain about the repeated accessor, ignore it, and keep parsing. 484 Diag(KindLoc, diag::err_ms_property_duplicate_accessor) << KindStr; 485 } else { 486 AccessorNames[Kind] = Tok.getIdentifierInfo(); 487 } 488 ConsumeToken(); 489 490 next_property_accessor: 491 // Keep processing accessors until we run out. 492 if (TryConsumeToken(tok::comma)) 493 continue; 494 495 // If we run into the ')', stop without consuming it. 496 if (Tok.is(tok::r_paren)) 497 break; 498 499 Diag(Tok.getLocation(), diag::err_ms_property_expected_comma_or_rparen); 500 break; 501 } 502 503 // Only add the property attribute if it was well-formed. 504 if (!HasInvalidAccessor) 505 Attrs.addNewPropertyAttr(AttrName, AttrNameLoc, nullptr, SourceLocation(), 506 AccessorNames[AK_Get], AccessorNames[AK_Put], 507 AttributeList::AS_Declspec); 508 T.skipToEnd(); 509 return !HasInvalidAccessor; 510 } 511 512 unsigned NumArgs = 513 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, nullptr, nullptr, 514 SourceLocation(), AttributeList::AS_Declspec); 515 516 // If this attribute's args were parsed, and it was expected to have 517 // arguments but none were provided, emit a diagnostic. 518 const AttributeList *Attr = Attrs.getList(); 519 if (Attr && Attr->getMaxArgs() && !NumArgs) { 520 Diag(OpenParenLoc, diag::err_attribute_requires_arguments) << AttrName; 521 return false; 522 } 523 return true; 524 } 525 526 /// [MS] decl-specifier: 527 /// __declspec ( extended-decl-modifier-seq ) 528 /// 529 /// [MS] extended-decl-modifier-seq: 530 /// extended-decl-modifier[opt] 531 /// extended-decl-modifier extended-decl-modifier-seq 532 void Parser::ParseMicrosoftDeclSpec(ParsedAttributes &Attrs) { 533 assert(Tok.is(tok::kw___declspec) && "Not a declspec!"); 534 535 ConsumeToken(); 536 BalancedDelimiterTracker T(*this, tok::l_paren); 537 if (T.expectAndConsume(diag::err_expected_lparen_after, "__declspec", 538 tok::r_paren)) 539 return; 540 541 // An empty declspec is perfectly legal and should not warn. Additionally, 542 // you can specify multiple attributes per declspec. 543 while (Tok.isNot(tok::r_paren)) { 544 // Attribute not present. 545 if (TryConsumeToken(tok::comma)) 546 continue; 547 548 // We expect either a well-known identifier or a generic string. Anything 549 // else is a malformed declspec. 550 bool IsString = Tok.getKind() == tok::string_literal; 551 if (!IsString && Tok.getKind() != tok::identifier && 552 Tok.getKind() != tok::kw_restrict) { 553 Diag(Tok, diag::err_ms_declspec_type); 554 T.skipToEnd(); 555 return; 556 } 557 558 IdentifierInfo *AttrName; 559 SourceLocation AttrNameLoc; 560 if (IsString) { 561 SmallString<8> StrBuffer; 562 bool Invalid = false; 563 StringRef Str = PP.getSpelling(Tok, StrBuffer, &Invalid); 564 if (Invalid) { 565 T.skipToEnd(); 566 return; 567 } 568 AttrName = PP.getIdentifierInfo(Str); 569 AttrNameLoc = ConsumeStringToken(); 570 } else { 571 AttrName = Tok.getIdentifierInfo(); 572 AttrNameLoc = ConsumeToken(); 573 } 574 575 bool AttrHandled = false; 576 577 // Parse attribute arguments. 578 if (Tok.is(tok::l_paren)) 579 AttrHandled = ParseMicrosoftDeclSpecArgs(AttrName, AttrNameLoc, Attrs); 580 else if (AttrName->getName() == "property") 581 // The property attribute must have an argument list. 582 Diag(Tok.getLocation(), diag::err_expected_lparen_after) 583 << AttrName->getName(); 584 585 if (!AttrHandled) 586 Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0, 587 AttributeList::AS_Declspec); 588 } 589 T.consumeClose(); 590 } 591 592 void Parser::ParseMicrosoftTypeAttributes(ParsedAttributes &attrs) { 593 // Treat these like attributes 594 while (true) { 595 switch (Tok.getKind()) { 596 case tok::kw___fastcall: 597 case tok::kw___stdcall: 598 case tok::kw___thiscall: 599 case tok::kw___cdecl: 600 case tok::kw___vectorcall: 601 case tok::kw___ptr64: 602 case tok::kw___w64: 603 case tok::kw___ptr32: 604 case tok::kw___unaligned: 605 case tok::kw___sptr: 606 case tok::kw___uptr: { 607 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 608 SourceLocation AttrNameLoc = ConsumeToken(); 609 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0, 610 AttributeList::AS_Keyword); 611 break; 612 } 613 default: 614 return; 615 } 616 } 617 } 618 619 void Parser::DiagnoseAndSkipExtendedMicrosoftTypeAttributes() { 620 SourceLocation StartLoc = Tok.getLocation(); 621 SourceLocation EndLoc = SkipExtendedMicrosoftTypeAttributes(); 622 623 if (EndLoc.isValid()) { 624 SourceRange Range(StartLoc, EndLoc); 625 Diag(StartLoc, diag::warn_microsoft_qualifiers_ignored) << Range; 626 } 627 } 628 629 SourceLocation Parser::SkipExtendedMicrosoftTypeAttributes() { 630 SourceLocation EndLoc; 631 632 while (true) { 633 switch (Tok.getKind()) { 634 case tok::kw_const: 635 case tok::kw_volatile: 636 case tok::kw___fastcall: 637 case tok::kw___stdcall: 638 case tok::kw___thiscall: 639 case tok::kw___cdecl: 640 case tok::kw___vectorcall: 641 case tok::kw___ptr32: 642 case tok::kw___ptr64: 643 case tok::kw___w64: 644 case tok::kw___unaligned: 645 case tok::kw___sptr: 646 case tok::kw___uptr: 647 EndLoc = ConsumeToken(); 648 break; 649 default: 650 return EndLoc; 651 } 652 } 653 } 654 655 void Parser::ParseBorlandTypeAttributes(ParsedAttributes &attrs) { 656 // Treat these like attributes 657 while (Tok.is(tok::kw___pascal)) { 658 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 659 SourceLocation AttrNameLoc = ConsumeToken(); 660 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0, 661 AttributeList::AS_Keyword); 662 } 663 } 664 665 void Parser::ParseOpenCLAttributes(ParsedAttributes &attrs) { 666 // Treat these like attributes 667 while (Tok.is(tok::kw___kernel)) { 668 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 669 SourceLocation AttrNameLoc = ConsumeToken(); 670 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0, 671 AttributeList::AS_Keyword); 672 } 673 } 674 675 void Parser::ParseOpenCLQualifiers(ParsedAttributes &Attrs) { 676 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 677 SourceLocation AttrNameLoc = Tok.getLocation(); 678 Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0, 679 AttributeList::AS_Keyword); 680 } 681 682 static bool VersionNumberSeparator(const char Separator) { 683 return (Separator == '.' || Separator == '_'); 684 } 685 686 /// \brief Parse a version number. 687 /// 688 /// version: 689 /// simple-integer 690 /// simple-integer ',' simple-integer 691 /// simple-integer ',' simple-integer ',' simple-integer 692 VersionTuple Parser::ParseVersionTuple(SourceRange &Range) { 693 Range = Tok.getLocation(); 694 695 if (!Tok.is(tok::numeric_constant)) { 696 Diag(Tok, diag::err_expected_version); 697 SkipUntil(tok::comma, tok::r_paren, 698 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion); 699 return VersionTuple(); 700 } 701 702 // Parse the major (and possibly minor and subminor) versions, which 703 // are stored in the numeric constant. We utilize a quirk of the 704 // lexer, which is that it handles something like 1.2.3 as a single 705 // numeric constant, rather than two separate tokens. 706 SmallString<512> Buffer; 707 Buffer.resize(Tok.getLength()+1); 708 const char *ThisTokBegin = &Buffer[0]; 709 710 // Get the spelling of the token, which eliminates trigraphs, etc. 711 bool Invalid = false; 712 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid); 713 if (Invalid) 714 return VersionTuple(); 715 716 // Parse the major version. 717 unsigned AfterMajor = 0; 718 unsigned Major = 0; 719 while (AfterMajor < ActualLength && isDigit(ThisTokBegin[AfterMajor])) { 720 Major = Major * 10 + ThisTokBegin[AfterMajor] - '0'; 721 ++AfterMajor; 722 } 723 724 if (AfterMajor == 0) { 725 Diag(Tok, diag::err_expected_version); 726 SkipUntil(tok::comma, tok::r_paren, 727 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion); 728 return VersionTuple(); 729 } 730 731 if (AfterMajor == ActualLength) { 732 ConsumeToken(); 733 734 // We only had a single version component. 735 if (Major == 0) { 736 Diag(Tok, diag::err_zero_version); 737 return VersionTuple(); 738 } 739 740 return VersionTuple(Major); 741 } 742 743 const char AfterMajorSeparator = ThisTokBegin[AfterMajor]; 744 if (!VersionNumberSeparator(AfterMajorSeparator) 745 || (AfterMajor + 1 == ActualLength)) { 746 Diag(Tok, diag::err_expected_version); 747 SkipUntil(tok::comma, tok::r_paren, 748 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion); 749 return VersionTuple(); 750 } 751 752 // Parse the minor version. 753 unsigned AfterMinor = AfterMajor + 1; 754 unsigned Minor = 0; 755 while (AfterMinor < ActualLength && isDigit(ThisTokBegin[AfterMinor])) { 756 Minor = Minor * 10 + ThisTokBegin[AfterMinor] - '0'; 757 ++AfterMinor; 758 } 759 760 if (AfterMinor == ActualLength) { 761 ConsumeToken(); 762 763 // We had major.minor. 764 if (Major == 0 && Minor == 0) { 765 Diag(Tok, diag::err_zero_version); 766 return VersionTuple(); 767 } 768 769 return VersionTuple(Major, Minor, (AfterMajorSeparator == '_')); 770 } 771 772 const char AfterMinorSeparator = ThisTokBegin[AfterMinor]; 773 // If what follows is not a '.' or '_', we have a problem. 774 if (!VersionNumberSeparator(AfterMinorSeparator)) { 775 Diag(Tok, diag::err_expected_version); 776 SkipUntil(tok::comma, tok::r_paren, 777 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion); 778 return VersionTuple(); 779 } 780 781 // Warn if separators, be it '.' or '_', do not match. 782 if (AfterMajorSeparator != AfterMinorSeparator) 783 Diag(Tok, diag::warn_expected_consistent_version_separator); 784 785 // Parse the subminor version. 786 unsigned AfterSubminor = AfterMinor + 1; 787 unsigned Subminor = 0; 788 while (AfterSubminor < ActualLength && isDigit(ThisTokBegin[AfterSubminor])) { 789 Subminor = Subminor * 10 + ThisTokBegin[AfterSubminor] - '0'; 790 ++AfterSubminor; 791 } 792 793 if (AfterSubminor != ActualLength) { 794 Diag(Tok, diag::err_expected_version); 795 SkipUntil(tok::comma, tok::r_paren, 796 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion); 797 return VersionTuple(); 798 } 799 ConsumeToken(); 800 return VersionTuple(Major, Minor, Subminor, (AfterMajorSeparator == '_')); 801 } 802 803 /// \brief Parse the contents of the "availability" attribute. 804 /// 805 /// availability-attribute: 806 /// 'availability' '(' platform ',' version-arg-list, opt-message')' 807 /// 808 /// platform: 809 /// identifier 810 /// 811 /// version-arg-list: 812 /// version-arg 813 /// version-arg ',' version-arg-list 814 /// 815 /// version-arg: 816 /// 'introduced' '=' version 817 /// 'deprecated' '=' version 818 /// 'obsoleted' = version 819 /// 'unavailable' 820 /// opt-message: 821 /// 'message' '=' <string> 822 void Parser::ParseAvailabilityAttribute(IdentifierInfo &Availability, 823 SourceLocation AvailabilityLoc, 824 ParsedAttributes &attrs, 825 SourceLocation *endLoc, 826 IdentifierInfo *ScopeName, 827 SourceLocation ScopeLoc, 828 AttributeList::Syntax Syntax) { 829 enum { Introduced, Deprecated, Obsoleted, Unknown }; 830 AvailabilityChange Changes[Unknown]; 831 ExprResult MessageExpr; 832 833 // Opening '('. 834 BalancedDelimiterTracker T(*this, tok::l_paren); 835 if (T.consumeOpen()) { 836 Diag(Tok, diag::err_expected) << tok::l_paren; 837 return; 838 } 839 840 // Parse the platform name, 841 if (Tok.isNot(tok::identifier)) { 842 Diag(Tok, diag::err_availability_expected_platform); 843 SkipUntil(tok::r_paren, StopAtSemi); 844 return; 845 } 846 IdentifierLoc *Platform = ParseIdentifierLoc(); 847 848 // Parse the ',' following the platform name. 849 if (ExpectAndConsume(tok::comma)) { 850 SkipUntil(tok::r_paren, StopAtSemi); 851 return; 852 } 853 854 // If we haven't grabbed the pointers for the identifiers 855 // "introduced", "deprecated", and "obsoleted", do so now. 856 if (!Ident_introduced) { 857 Ident_introduced = PP.getIdentifierInfo("introduced"); 858 Ident_deprecated = PP.getIdentifierInfo("deprecated"); 859 Ident_obsoleted = PP.getIdentifierInfo("obsoleted"); 860 Ident_unavailable = PP.getIdentifierInfo("unavailable"); 861 Ident_message = PP.getIdentifierInfo("message"); 862 } 863 864 // Parse the set of introductions/deprecations/removals. 865 SourceLocation UnavailableLoc; 866 do { 867 if (Tok.isNot(tok::identifier)) { 868 Diag(Tok, diag::err_availability_expected_change); 869 SkipUntil(tok::r_paren, StopAtSemi); 870 return; 871 } 872 IdentifierInfo *Keyword = Tok.getIdentifierInfo(); 873 SourceLocation KeywordLoc = ConsumeToken(); 874 875 if (Keyword == Ident_unavailable) { 876 if (UnavailableLoc.isValid()) { 877 Diag(KeywordLoc, diag::err_availability_redundant) 878 << Keyword << SourceRange(UnavailableLoc); 879 } 880 UnavailableLoc = KeywordLoc; 881 continue; 882 } 883 884 if (Tok.isNot(tok::equal)) { 885 Diag(Tok, diag::err_expected_after) << Keyword << tok::equal; 886 SkipUntil(tok::r_paren, StopAtSemi); 887 return; 888 } 889 ConsumeToken(); 890 if (Keyword == Ident_message) { 891 if (Tok.isNot(tok::string_literal)) { 892 Diag(Tok, diag::err_expected_string_literal) 893 << /*Source='availability attribute'*/2; 894 SkipUntil(tok::r_paren, StopAtSemi); 895 return; 896 } 897 MessageExpr = ParseStringLiteralExpression(); 898 // Also reject wide string literals. 899 if (StringLiteral *MessageStringLiteral = 900 cast_or_null<StringLiteral>(MessageExpr.get())) { 901 if (MessageStringLiteral->getCharByteWidth() != 1) { 902 Diag(MessageStringLiteral->getSourceRange().getBegin(), 903 diag::err_expected_string_literal) 904 << /*Source='availability attribute'*/ 2; 905 SkipUntil(tok::r_paren, StopAtSemi); 906 return; 907 } 908 } 909 break; 910 } 911 912 // Special handling of 'NA' only when applied to introduced or 913 // deprecated. 914 if ((Keyword == Ident_introduced || Keyword == Ident_deprecated) && 915 Tok.is(tok::identifier)) { 916 IdentifierInfo *NA = Tok.getIdentifierInfo(); 917 if (NA->getName() == "NA") { 918 ConsumeToken(); 919 if (Keyword == Ident_introduced) 920 UnavailableLoc = KeywordLoc; 921 continue; 922 } 923 } 924 925 SourceRange VersionRange; 926 VersionTuple Version = ParseVersionTuple(VersionRange); 927 928 if (Version.empty()) { 929 SkipUntil(tok::r_paren, StopAtSemi); 930 return; 931 } 932 933 unsigned Index; 934 if (Keyword == Ident_introduced) 935 Index = Introduced; 936 else if (Keyword == Ident_deprecated) 937 Index = Deprecated; 938 else if (Keyword == Ident_obsoleted) 939 Index = Obsoleted; 940 else 941 Index = Unknown; 942 943 if (Index < Unknown) { 944 if (!Changes[Index].KeywordLoc.isInvalid()) { 945 Diag(KeywordLoc, diag::err_availability_redundant) 946 << Keyword 947 << SourceRange(Changes[Index].KeywordLoc, 948 Changes[Index].VersionRange.getEnd()); 949 } 950 951 Changes[Index].KeywordLoc = KeywordLoc; 952 Changes[Index].Version = Version; 953 Changes[Index].VersionRange = VersionRange; 954 } else { 955 Diag(KeywordLoc, diag::err_availability_unknown_change) 956 << Keyword << VersionRange; 957 } 958 959 } while (TryConsumeToken(tok::comma)); 960 961 // Closing ')'. 962 if (T.consumeClose()) 963 return; 964 965 if (endLoc) 966 *endLoc = T.getCloseLocation(); 967 968 // The 'unavailable' availability cannot be combined with any other 969 // availability changes. Make sure that hasn't happened. 970 if (UnavailableLoc.isValid()) { 971 bool Complained = false; 972 for (unsigned Index = Introduced; Index != Unknown; ++Index) { 973 if (Changes[Index].KeywordLoc.isValid()) { 974 if (!Complained) { 975 Diag(UnavailableLoc, diag::warn_availability_and_unavailable) 976 << SourceRange(Changes[Index].KeywordLoc, 977 Changes[Index].VersionRange.getEnd()); 978 Complained = true; 979 } 980 981 // Clear out the availability. 982 Changes[Index] = AvailabilityChange(); 983 } 984 } 985 } 986 987 // Record this attribute 988 attrs.addNew(&Availability, 989 SourceRange(AvailabilityLoc, T.getCloseLocation()), 990 ScopeName, ScopeLoc, 991 Platform, 992 Changes[Introduced], 993 Changes[Deprecated], 994 Changes[Obsoleted], 995 UnavailableLoc, MessageExpr.get(), 996 Syntax); 997 } 998 999 /// \brief Parse the contents of the "objc_bridge_related" attribute. 1000 /// objc_bridge_related '(' related_class ',' opt-class_method ',' opt-instance_method ')' 1001 /// related_class: 1002 /// Identifier 1003 /// 1004 /// opt-class_method: 1005 /// Identifier: | <empty> 1006 /// 1007 /// opt-instance_method: 1008 /// Identifier | <empty> 1009 /// 1010 void Parser::ParseObjCBridgeRelatedAttribute(IdentifierInfo &ObjCBridgeRelated, 1011 SourceLocation ObjCBridgeRelatedLoc, 1012 ParsedAttributes &attrs, 1013 SourceLocation *endLoc, 1014 IdentifierInfo *ScopeName, 1015 SourceLocation ScopeLoc, 1016 AttributeList::Syntax Syntax) { 1017 // Opening '('. 1018 BalancedDelimiterTracker T(*this, tok::l_paren); 1019 if (T.consumeOpen()) { 1020 Diag(Tok, diag::err_expected) << tok::l_paren; 1021 return; 1022 } 1023 1024 // Parse the related class name. 1025 if (Tok.isNot(tok::identifier)) { 1026 Diag(Tok, diag::err_objcbridge_related_expected_related_class); 1027 SkipUntil(tok::r_paren, StopAtSemi); 1028 return; 1029 } 1030 IdentifierLoc *RelatedClass = ParseIdentifierLoc(); 1031 if (ExpectAndConsume(tok::comma)) { 1032 SkipUntil(tok::r_paren, StopAtSemi); 1033 return; 1034 } 1035 1036 // Parse optional class method name. 1037 IdentifierLoc *ClassMethod = nullptr; 1038 if (Tok.is(tok::identifier)) { 1039 ClassMethod = ParseIdentifierLoc(); 1040 if (!TryConsumeToken(tok::colon)) { 1041 Diag(Tok, diag::err_objcbridge_related_selector_name); 1042 SkipUntil(tok::r_paren, StopAtSemi); 1043 return; 1044 } 1045 } 1046 if (!TryConsumeToken(tok::comma)) { 1047 if (Tok.is(tok::colon)) 1048 Diag(Tok, diag::err_objcbridge_related_selector_name); 1049 else 1050 Diag(Tok, diag::err_expected) << tok::comma; 1051 SkipUntil(tok::r_paren, StopAtSemi); 1052 return; 1053 } 1054 1055 // Parse optional instance method name. 1056 IdentifierLoc *InstanceMethod = nullptr; 1057 if (Tok.is(tok::identifier)) 1058 InstanceMethod = ParseIdentifierLoc(); 1059 else if (Tok.isNot(tok::r_paren)) { 1060 Diag(Tok, diag::err_expected) << tok::r_paren; 1061 SkipUntil(tok::r_paren, StopAtSemi); 1062 return; 1063 } 1064 1065 // Closing ')'. 1066 if (T.consumeClose()) 1067 return; 1068 1069 if (endLoc) 1070 *endLoc = T.getCloseLocation(); 1071 1072 // Record this attribute 1073 attrs.addNew(&ObjCBridgeRelated, 1074 SourceRange(ObjCBridgeRelatedLoc, T.getCloseLocation()), 1075 ScopeName, ScopeLoc, 1076 RelatedClass, 1077 ClassMethod, 1078 InstanceMethod, 1079 Syntax); 1080 } 1081 1082 // Late Parsed Attributes: 1083 // See other examples of late parsing in lib/Parse/ParseCXXInlineMethods 1084 1085 void Parser::LateParsedDeclaration::ParseLexedAttributes() {} 1086 1087 void Parser::LateParsedClass::ParseLexedAttributes() { 1088 Self->ParseLexedAttributes(*Class); 1089 } 1090 1091 void Parser::LateParsedAttribute::ParseLexedAttributes() { 1092 Self->ParseLexedAttribute(*this, true, false); 1093 } 1094 1095 /// Wrapper class which calls ParseLexedAttribute, after setting up the 1096 /// scope appropriately. 1097 void Parser::ParseLexedAttributes(ParsingClass &Class) { 1098 // Deal with templates 1099 // FIXME: Test cases to make sure this does the right thing for templates. 1100 bool HasTemplateScope = !Class.TopLevelClass && Class.TemplateScope; 1101 ParseScope ClassTemplateScope(this, Scope::TemplateParamScope, 1102 HasTemplateScope); 1103 if (HasTemplateScope) 1104 Actions.ActOnReenterTemplateScope(getCurScope(), Class.TagOrTemplate); 1105 1106 // Set or update the scope flags. 1107 bool AlreadyHasClassScope = Class.TopLevelClass; 1108 unsigned ScopeFlags = Scope::ClassScope|Scope::DeclScope; 1109 ParseScope ClassScope(this, ScopeFlags, !AlreadyHasClassScope); 1110 ParseScopeFlags ClassScopeFlags(this, ScopeFlags, AlreadyHasClassScope); 1111 1112 // Enter the scope of nested classes 1113 if (!AlreadyHasClassScope) 1114 Actions.ActOnStartDelayedMemberDeclarations(getCurScope(), 1115 Class.TagOrTemplate); 1116 if (!Class.LateParsedDeclarations.empty()) { 1117 for (unsigned i = 0, ni = Class.LateParsedDeclarations.size(); i < ni; ++i){ 1118 Class.LateParsedDeclarations[i]->ParseLexedAttributes(); 1119 } 1120 } 1121 1122 if (!AlreadyHasClassScope) 1123 Actions.ActOnFinishDelayedMemberDeclarations(getCurScope(), 1124 Class.TagOrTemplate); 1125 } 1126 1127 1128 /// \brief Parse all attributes in LAs, and attach them to Decl D. 1129 void Parser::ParseLexedAttributeList(LateParsedAttrList &LAs, Decl *D, 1130 bool EnterScope, bool OnDefinition) { 1131 assert(LAs.parseSoon() && 1132 "Attribute list should be marked for immediate parsing."); 1133 for (unsigned i = 0, ni = LAs.size(); i < ni; ++i) { 1134 if (D) 1135 LAs[i]->addDecl(D); 1136 ParseLexedAttribute(*LAs[i], EnterScope, OnDefinition); 1137 delete LAs[i]; 1138 } 1139 LAs.clear(); 1140 } 1141 1142 1143 /// \brief Finish parsing an attribute for which parsing was delayed. 1144 /// This will be called at the end of parsing a class declaration 1145 /// for each LateParsedAttribute. We consume the saved tokens and 1146 /// create an attribute with the arguments filled in. We add this 1147 /// to the Attribute list for the decl. 1148 void Parser::ParseLexedAttribute(LateParsedAttribute &LA, 1149 bool EnterScope, bool OnDefinition) { 1150 // Create a fake EOF so that attribute parsing won't go off the end of the 1151 // attribute. 1152 Token AttrEnd; 1153 AttrEnd.startToken(); 1154 AttrEnd.setKind(tok::eof); 1155 AttrEnd.setLocation(Tok.getLocation()); 1156 AttrEnd.setEofData(LA.Toks.data()); 1157 LA.Toks.push_back(AttrEnd); 1158 1159 // Append the current token at the end of the new token stream so that it 1160 // doesn't get lost. 1161 LA.Toks.push_back(Tok); 1162 PP.EnterTokenStream(LA.Toks.data(), LA.Toks.size(), true, false); 1163 // Consume the previously pushed token. 1164 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true); 1165 1166 ParsedAttributes Attrs(AttrFactory); 1167 SourceLocation endLoc; 1168 1169 if (LA.Decls.size() > 0) { 1170 Decl *D = LA.Decls[0]; 1171 NamedDecl *ND = dyn_cast<NamedDecl>(D); 1172 RecordDecl *RD = dyn_cast_or_null<RecordDecl>(D->getDeclContext()); 1173 1174 // Allow 'this' within late-parsed attributes. 1175 Sema::CXXThisScopeRAII ThisScope(Actions, RD, /*TypeQuals=*/0, 1176 ND && ND->isCXXInstanceMember()); 1177 1178 if (LA.Decls.size() == 1) { 1179 // If the Decl is templatized, add template parameters to scope. 1180 bool HasTemplateScope = EnterScope && D->isTemplateDecl(); 1181 ParseScope TempScope(this, Scope::TemplateParamScope, HasTemplateScope); 1182 if (HasTemplateScope) 1183 Actions.ActOnReenterTemplateScope(Actions.CurScope, D); 1184 1185 // If the Decl is on a function, add function parameters to the scope. 1186 bool HasFunScope = EnterScope && D->isFunctionOrFunctionTemplate(); 1187 ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope, HasFunScope); 1188 if (HasFunScope) 1189 Actions.ActOnReenterFunctionContext(Actions.CurScope, D); 1190 1191 ParseGNUAttributeArgs(&LA.AttrName, LA.AttrNameLoc, Attrs, &endLoc, 1192 nullptr, SourceLocation(), AttributeList::AS_GNU, 1193 nullptr); 1194 1195 if (HasFunScope) { 1196 Actions.ActOnExitFunctionContext(); 1197 FnScope.Exit(); // Pop scope, and remove Decls from IdResolver 1198 } 1199 if (HasTemplateScope) { 1200 TempScope.Exit(); 1201 } 1202 } else { 1203 // If there are multiple decls, then the decl cannot be within the 1204 // function scope. 1205 ParseGNUAttributeArgs(&LA.AttrName, LA.AttrNameLoc, Attrs, &endLoc, 1206 nullptr, SourceLocation(), AttributeList::AS_GNU, 1207 nullptr); 1208 } 1209 } else { 1210 Diag(Tok, diag::warn_attribute_no_decl) << LA.AttrName.getName(); 1211 } 1212 1213 const AttributeList *AL = Attrs.getList(); 1214 if (OnDefinition && AL && !AL->isCXX11Attribute() && 1215 AL->isKnownToGCC()) 1216 Diag(Tok, diag::warn_attribute_on_function_definition) 1217 << &LA.AttrName; 1218 1219 for (unsigned i = 0, ni = LA.Decls.size(); i < ni; ++i) 1220 Actions.ActOnFinishDelayedAttribute(getCurScope(), LA.Decls[i], Attrs); 1221 1222 // Due to a parsing error, we either went over the cached tokens or 1223 // there are still cached tokens left, so we skip the leftover tokens. 1224 while (Tok.isNot(tok::eof)) 1225 ConsumeAnyToken(); 1226 1227 if (Tok.is(tok::eof) && Tok.getEofData() == AttrEnd.getEofData()) 1228 ConsumeAnyToken(); 1229 } 1230 1231 void Parser::ParseTypeTagForDatatypeAttribute(IdentifierInfo &AttrName, 1232 SourceLocation AttrNameLoc, 1233 ParsedAttributes &Attrs, 1234 SourceLocation *EndLoc, 1235 IdentifierInfo *ScopeName, 1236 SourceLocation ScopeLoc, 1237 AttributeList::Syntax Syntax) { 1238 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('"); 1239 1240 BalancedDelimiterTracker T(*this, tok::l_paren); 1241 T.consumeOpen(); 1242 1243 if (Tok.isNot(tok::identifier)) { 1244 Diag(Tok, diag::err_expected) << tok::identifier; 1245 T.skipToEnd(); 1246 return; 1247 } 1248 IdentifierLoc *ArgumentKind = ParseIdentifierLoc(); 1249 1250 if (ExpectAndConsume(tok::comma)) { 1251 T.skipToEnd(); 1252 return; 1253 } 1254 1255 SourceRange MatchingCTypeRange; 1256 TypeResult MatchingCType = ParseTypeName(&MatchingCTypeRange); 1257 if (MatchingCType.isInvalid()) { 1258 T.skipToEnd(); 1259 return; 1260 } 1261 1262 bool LayoutCompatible = false; 1263 bool MustBeNull = false; 1264 while (TryConsumeToken(tok::comma)) { 1265 if (Tok.isNot(tok::identifier)) { 1266 Diag(Tok, diag::err_expected) << tok::identifier; 1267 T.skipToEnd(); 1268 return; 1269 } 1270 IdentifierInfo *Flag = Tok.getIdentifierInfo(); 1271 if (Flag->isStr("layout_compatible")) 1272 LayoutCompatible = true; 1273 else if (Flag->isStr("must_be_null")) 1274 MustBeNull = true; 1275 else { 1276 Diag(Tok, diag::err_type_safety_unknown_flag) << Flag; 1277 T.skipToEnd(); 1278 return; 1279 } 1280 ConsumeToken(); // consume flag 1281 } 1282 1283 if (!T.consumeClose()) { 1284 Attrs.addNewTypeTagForDatatype(&AttrName, AttrNameLoc, ScopeName, ScopeLoc, 1285 ArgumentKind, MatchingCType.get(), 1286 LayoutCompatible, MustBeNull, Syntax); 1287 } 1288 1289 if (EndLoc) 1290 *EndLoc = T.getCloseLocation(); 1291 } 1292 1293 /// DiagnoseProhibitedCXX11Attribute - We have found the opening square brackets 1294 /// of a C++11 attribute-specifier in a location where an attribute is not 1295 /// permitted. By C++11 [dcl.attr.grammar]p6, this is ill-formed. Diagnose this 1296 /// situation. 1297 /// 1298 /// \return \c true if we skipped an attribute-like chunk of tokens, \c false if 1299 /// this doesn't appear to actually be an attribute-specifier, and the caller 1300 /// should try to parse it. 1301 bool Parser::DiagnoseProhibitedCXX11Attribute() { 1302 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)); 1303 1304 switch (isCXX11AttributeSpecifier(/*Disambiguate*/true)) { 1305 case CAK_NotAttributeSpecifier: 1306 // No diagnostic: we're in Obj-C++11 and this is not actually an attribute. 1307 return false; 1308 1309 case CAK_InvalidAttributeSpecifier: 1310 Diag(Tok.getLocation(), diag::err_l_square_l_square_not_attribute); 1311 return false; 1312 1313 case CAK_AttributeSpecifier: 1314 // Parse and discard the attributes. 1315 SourceLocation BeginLoc = ConsumeBracket(); 1316 ConsumeBracket(); 1317 SkipUntil(tok::r_square); 1318 assert(Tok.is(tok::r_square) && "isCXX11AttributeSpecifier lied"); 1319 SourceLocation EndLoc = ConsumeBracket(); 1320 Diag(BeginLoc, diag::err_attributes_not_allowed) 1321 << SourceRange(BeginLoc, EndLoc); 1322 return true; 1323 } 1324 llvm_unreachable("All cases handled above."); 1325 } 1326 1327 /// \brief We have found the opening square brackets of a C++11 1328 /// attribute-specifier in a location where an attribute is not permitted, but 1329 /// we know where the attributes ought to be written. Parse them anyway, and 1330 /// provide a fixit moving them to the right place. 1331 void Parser::DiagnoseMisplacedCXX11Attribute(ParsedAttributesWithRange &Attrs, 1332 SourceLocation CorrectLocation) { 1333 assert((Tok.is(tok::l_square) && NextToken().is(tok::l_square)) || 1334 Tok.is(tok::kw_alignas)); 1335 1336 // Consume the attributes. 1337 SourceLocation Loc = Tok.getLocation(); 1338 ParseCXX11Attributes(Attrs); 1339 CharSourceRange AttrRange(SourceRange(Loc, Attrs.Range.getEnd()), true); 1340 1341 Diag(Loc, diag::err_attributes_not_allowed) 1342 << FixItHint::CreateInsertionFromRange(CorrectLocation, AttrRange) 1343 << FixItHint::CreateRemoval(AttrRange); 1344 } 1345 1346 void Parser::DiagnoseProhibitedAttributes(ParsedAttributesWithRange &attrs) { 1347 Diag(attrs.Range.getBegin(), diag::err_attributes_not_allowed) 1348 << attrs.Range; 1349 } 1350 1351 void Parser::ProhibitCXX11Attributes(ParsedAttributesWithRange &attrs) { 1352 AttributeList *AttrList = attrs.getList(); 1353 while (AttrList) { 1354 if (AttrList->isCXX11Attribute()) { 1355 Diag(AttrList->getLoc(), diag::err_attribute_not_type_attr) 1356 << AttrList->getName(); 1357 AttrList->setInvalid(); 1358 } 1359 AttrList = AttrList->getNext(); 1360 } 1361 } 1362 1363 /// ParseDeclaration - Parse a full 'declaration', which consists of 1364 /// declaration-specifiers, some number of declarators, and a semicolon. 1365 /// 'Context' should be a Declarator::TheContext value. This returns the 1366 /// location of the semicolon in DeclEnd. 1367 /// 1368 /// declaration: [C99 6.7] 1369 /// block-declaration -> 1370 /// simple-declaration 1371 /// others [FIXME] 1372 /// [C++] template-declaration 1373 /// [C++] namespace-definition 1374 /// [C++] using-directive 1375 /// [C++] using-declaration 1376 /// [C++11/C11] static_assert-declaration 1377 /// others... [FIXME] 1378 /// 1379 Parser::DeclGroupPtrTy Parser::ParseDeclaration(unsigned Context, 1380 SourceLocation &DeclEnd, 1381 ParsedAttributesWithRange &attrs) { 1382 ParenBraceBracketBalancer BalancerRAIIObj(*this); 1383 // Must temporarily exit the objective-c container scope for 1384 // parsing c none objective-c decls. 1385 ObjCDeclContextSwitch ObjCDC(*this); 1386 1387 Decl *SingleDecl = nullptr; 1388 Decl *OwnedType = nullptr; 1389 switch (Tok.getKind()) { 1390 case tok::kw_template: 1391 case tok::kw_export: 1392 ProhibitAttributes(attrs); 1393 SingleDecl = ParseDeclarationStartingWithTemplate(Context, DeclEnd); 1394 break; 1395 case tok::kw_inline: 1396 // Could be the start of an inline namespace. Allowed as an ext in C++03. 1397 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_namespace)) { 1398 ProhibitAttributes(attrs); 1399 SourceLocation InlineLoc = ConsumeToken(); 1400 SingleDecl = ParseNamespace(Context, DeclEnd, InlineLoc); 1401 break; 1402 } 1403 return ParseSimpleDeclaration(Context, DeclEnd, attrs, 1404 true); 1405 case tok::kw_namespace: 1406 ProhibitAttributes(attrs); 1407 SingleDecl = ParseNamespace(Context, DeclEnd); 1408 break; 1409 case tok::kw_using: 1410 SingleDecl = ParseUsingDirectiveOrDeclaration(Context, ParsedTemplateInfo(), 1411 DeclEnd, attrs, &OwnedType); 1412 break; 1413 case tok::kw_static_assert: 1414 case tok::kw__Static_assert: 1415 ProhibitAttributes(attrs); 1416 SingleDecl = ParseStaticAssertDeclaration(DeclEnd); 1417 break; 1418 default: 1419 return ParseSimpleDeclaration(Context, DeclEnd, attrs, true); 1420 } 1421 1422 // This routine returns a DeclGroup, if the thing we parsed only contains a 1423 // single decl, convert it now. Alias declarations can also declare a type; 1424 // include that too if it is present. 1425 return Actions.ConvertDeclToDeclGroup(SingleDecl, OwnedType); 1426 } 1427 1428 /// simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl] 1429 /// declaration-specifiers init-declarator-list[opt] ';' 1430 /// [C++11] attribute-specifier-seq decl-specifier-seq[opt] 1431 /// init-declarator-list ';' 1432 ///[C90/C++]init-declarator-list ';' [TODO] 1433 /// [OMP] threadprivate-directive [TODO] 1434 /// 1435 /// for-range-declaration: [C++11 6.5p1: stmt.ranged] 1436 /// attribute-specifier-seq[opt] type-specifier-seq declarator 1437 /// 1438 /// If RequireSemi is false, this does not check for a ';' at the end of the 1439 /// declaration. If it is true, it checks for and eats it. 1440 /// 1441 /// If FRI is non-null, we might be parsing a for-range-declaration instead 1442 /// of a simple-declaration. If we find that we are, we also parse the 1443 /// for-range-initializer, and place it here. 1444 Parser::DeclGroupPtrTy 1445 Parser::ParseSimpleDeclaration(unsigned Context, 1446 SourceLocation &DeclEnd, 1447 ParsedAttributesWithRange &Attrs, 1448 bool RequireSemi, ForRangeInit *FRI) { 1449 // Parse the common declaration-specifiers piece. 1450 ParsingDeclSpec DS(*this); 1451 1452 DeclSpecContext DSContext = getDeclSpecContextFromDeclaratorContext(Context); 1453 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none, DSContext); 1454 1455 // If we had a free-standing type definition with a missing semicolon, we 1456 // may get this far before the problem becomes obvious. 1457 if (DS.hasTagDefinition() && 1458 DiagnoseMissingSemiAfterTagDefinition(DS, AS_none, DSContext)) 1459 return DeclGroupPtrTy(); 1460 1461 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };" 1462 // declaration-specifiers init-declarator-list[opt] ';' 1463 if (Tok.is(tok::semi)) { 1464 ProhibitAttributes(Attrs); 1465 DeclEnd = Tok.getLocation(); 1466 if (RequireSemi) ConsumeToken(); 1467 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none, 1468 DS); 1469 DS.complete(TheDecl); 1470 return Actions.ConvertDeclToDeclGroup(TheDecl); 1471 } 1472 1473 DS.takeAttributesFrom(Attrs); 1474 return ParseDeclGroup(DS, Context, &DeclEnd, FRI); 1475 } 1476 1477 /// Returns true if this might be the start of a declarator, or a common typo 1478 /// for a declarator. 1479 bool Parser::MightBeDeclarator(unsigned Context) { 1480 switch (Tok.getKind()) { 1481 case tok::annot_cxxscope: 1482 case tok::annot_template_id: 1483 case tok::caret: 1484 case tok::code_completion: 1485 case tok::coloncolon: 1486 case tok::ellipsis: 1487 case tok::kw___attribute: 1488 case tok::kw_operator: 1489 case tok::l_paren: 1490 case tok::star: 1491 return true; 1492 1493 case tok::amp: 1494 case tok::ampamp: 1495 return getLangOpts().CPlusPlus; 1496 1497 case tok::l_square: // Might be an attribute on an unnamed bit-field. 1498 return Context == Declarator::MemberContext && getLangOpts().CPlusPlus11 && 1499 NextToken().is(tok::l_square); 1500 1501 case tok::colon: // Might be a typo for '::' or an unnamed bit-field. 1502 return Context == Declarator::MemberContext || getLangOpts().CPlusPlus; 1503 1504 case tok::identifier: 1505 switch (NextToken().getKind()) { 1506 case tok::code_completion: 1507 case tok::coloncolon: 1508 case tok::comma: 1509 case tok::equal: 1510 case tok::equalequal: // Might be a typo for '='. 1511 case tok::kw_alignas: 1512 case tok::kw_asm: 1513 case tok::kw___attribute: 1514 case tok::l_brace: 1515 case tok::l_paren: 1516 case tok::l_square: 1517 case tok::less: 1518 case tok::r_brace: 1519 case tok::r_paren: 1520 case tok::r_square: 1521 case tok::semi: 1522 return true; 1523 1524 case tok::colon: 1525 // At namespace scope, 'identifier:' is probably a typo for 'identifier::' 1526 // and in block scope it's probably a label. Inside a class definition, 1527 // this is a bit-field. 1528 return Context == Declarator::MemberContext || 1529 (getLangOpts().CPlusPlus && Context == Declarator::FileContext); 1530 1531 case tok::identifier: // Possible virt-specifier. 1532 return getLangOpts().CPlusPlus11 && isCXX11VirtSpecifier(NextToken()); 1533 1534 default: 1535 return false; 1536 } 1537 1538 default: 1539 return false; 1540 } 1541 } 1542 1543 /// Skip until we reach something which seems like a sensible place to pick 1544 /// up parsing after a malformed declaration. This will sometimes stop sooner 1545 /// than SkipUntil(tok::r_brace) would, but will never stop later. 1546 void Parser::SkipMalformedDecl() { 1547 while (true) { 1548 switch (Tok.getKind()) { 1549 case tok::l_brace: 1550 // Skip until matching }, then stop. We've probably skipped over 1551 // a malformed class or function definition or similar. 1552 ConsumeBrace(); 1553 SkipUntil(tok::r_brace); 1554 if (Tok.is(tok::comma) || Tok.is(tok::l_brace) || Tok.is(tok::kw_try)) { 1555 // This declaration isn't over yet. Keep skipping. 1556 continue; 1557 } 1558 TryConsumeToken(tok::semi); 1559 return; 1560 1561 case tok::l_square: 1562 ConsumeBracket(); 1563 SkipUntil(tok::r_square); 1564 continue; 1565 1566 case tok::l_paren: 1567 ConsumeParen(); 1568 SkipUntil(tok::r_paren); 1569 continue; 1570 1571 case tok::r_brace: 1572 return; 1573 1574 case tok::semi: 1575 ConsumeToken(); 1576 return; 1577 1578 case tok::kw_inline: 1579 // 'inline namespace' at the start of a line is almost certainly 1580 // a good place to pick back up parsing, except in an Objective-C 1581 // @interface context. 1582 if (Tok.isAtStartOfLine() && NextToken().is(tok::kw_namespace) && 1583 (!ParsingInObjCContainer || CurParsedObjCImpl)) 1584 return; 1585 break; 1586 1587 case tok::kw_namespace: 1588 // 'namespace' at the start of a line is almost certainly a good 1589 // place to pick back up parsing, except in an Objective-C 1590 // @interface context. 1591 if (Tok.isAtStartOfLine() && 1592 (!ParsingInObjCContainer || CurParsedObjCImpl)) 1593 return; 1594 break; 1595 1596 case tok::at: 1597 // @end is very much like } in Objective-C contexts. 1598 if (NextToken().isObjCAtKeyword(tok::objc_end) && 1599 ParsingInObjCContainer) 1600 return; 1601 break; 1602 1603 case tok::minus: 1604 case tok::plus: 1605 // - and + probably start new method declarations in Objective-C contexts. 1606 if (Tok.isAtStartOfLine() && ParsingInObjCContainer) 1607 return; 1608 break; 1609 1610 case tok::eof: 1611 case tok::annot_module_begin: 1612 case tok::annot_module_end: 1613 case tok::annot_module_include: 1614 return; 1615 1616 default: 1617 break; 1618 } 1619 1620 ConsumeAnyToken(); 1621 } 1622 } 1623 1624 /// ParseDeclGroup - Having concluded that this is either a function 1625 /// definition or a group of object declarations, actually parse the 1626 /// result. 1627 Parser::DeclGroupPtrTy Parser::ParseDeclGroup(ParsingDeclSpec &DS, 1628 unsigned Context, 1629 SourceLocation *DeclEnd, 1630 ForRangeInit *FRI) { 1631 // Parse the first declarator. 1632 ParsingDeclarator D(*this, DS, static_cast<Declarator::TheContext>(Context)); 1633 ParseDeclarator(D); 1634 1635 // Bail out if the first declarator didn't seem well-formed. 1636 if (!D.hasName() && !D.mayOmitIdentifier()) { 1637 SkipMalformedDecl(); 1638 return DeclGroupPtrTy(); 1639 } 1640 1641 // Save late-parsed attributes for now; they need to be parsed in the 1642 // appropriate function scope after the function Decl has been constructed. 1643 // These will be parsed in ParseFunctionDefinition or ParseLexedAttrList. 1644 LateParsedAttrList LateParsedAttrs(true); 1645 if (D.isFunctionDeclarator()) { 1646 MaybeParseGNUAttributes(D, &LateParsedAttrs); 1647 1648 // The _Noreturn keyword can't appear here, unlike the GNU noreturn 1649 // attribute. If we find the keyword here, tell the user to put it 1650 // at the start instead. 1651 if (Tok.is(tok::kw__Noreturn)) { 1652 SourceLocation Loc = ConsumeToken(); 1653 const char *PrevSpec; 1654 unsigned DiagID; 1655 1656 // We can offer a fixit if it's valid to mark this function as _Noreturn 1657 // and we don't have any other declarators in this declaration. 1658 bool Fixit = !DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID); 1659 MaybeParseGNUAttributes(D, &LateParsedAttrs); 1660 Fixit &= Tok.is(tok::semi) || Tok.is(tok::l_brace) || Tok.is(tok::kw_try); 1661 1662 Diag(Loc, diag::err_c11_noreturn_misplaced) 1663 << (Fixit ? FixItHint::CreateRemoval(Loc) : FixItHint()) 1664 << (Fixit ? FixItHint::CreateInsertion(D.getLocStart(), "_Noreturn ") 1665 : FixItHint()); 1666 } 1667 } 1668 1669 // Check to see if we have a function *definition* which must have a body. 1670 if (D.isFunctionDeclarator() && 1671 // Look at the next token to make sure that this isn't a function 1672 // declaration. We have to check this because __attribute__ might be the 1673 // start of a function definition in GCC-extended K&R C. 1674 !isDeclarationAfterDeclarator()) { 1675 1676 // Function definitions are only allowed at file scope and in C++ classes. 1677 // The C++ inline method definition case is handled elsewhere, so we only 1678 // need to handle the file scope definition case. 1679 if (Context == Declarator::FileContext) { 1680 if (isStartOfFunctionDefinition(D)) { 1681 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 1682 Diag(Tok, diag::err_function_declared_typedef); 1683 1684 // Recover by treating the 'typedef' as spurious. 1685 DS.ClearStorageClassSpecs(); 1686 } 1687 1688 Decl *TheDecl = 1689 ParseFunctionDefinition(D, ParsedTemplateInfo(), &LateParsedAttrs); 1690 return Actions.ConvertDeclToDeclGroup(TheDecl); 1691 } 1692 1693 if (isDeclarationSpecifier()) { 1694 // If there is an invalid declaration specifier right after the 1695 // function prototype, then we must be in a missing semicolon case 1696 // where this isn't actually a body. Just fall through into the code 1697 // that handles it as a prototype, and let the top-level code handle 1698 // the erroneous declspec where it would otherwise expect a comma or 1699 // semicolon. 1700 } else { 1701 Diag(Tok, diag::err_expected_fn_body); 1702 SkipUntil(tok::semi); 1703 return DeclGroupPtrTy(); 1704 } 1705 } else { 1706 if (Tok.is(tok::l_brace)) { 1707 Diag(Tok, diag::err_function_definition_not_allowed); 1708 SkipMalformedDecl(); 1709 return DeclGroupPtrTy(); 1710 } 1711 } 1712 } 1713 1714 if (ParseAsmAttributesAfterDeclarator(D)) 1715 return DeclGroupPtrTy(); 1716 1717 // C++0x [stmt.iter]p1: Check if we have a for-range-declarator. If so, we 1718 // must parse and analyze the for-range-initializer before the declaration is 1719 // analyzed. 1720 // 1721 // Handle the Objective-C for-in loop variable similarly, although we 1722 // don't need to parse the container in advance. 1723 if (FRI && (Tok.is(tok::colon) || isTokIdentifier_in())) { 1724 bool IsForRangeLoop = false; 1725 if (TryConsumeToken(tok::colon, FRI->ColonLoc)) { 1726 IsForRangeLoop = true; 1727 if (Tok.is(tok::l_brace)) 1728 FRI->RangeExpr = ParseBraceInitializer(); 1729 else 1730 FRI->RangeExpr = ParseExpression(); 1731 } 1732 1733 Decl *ThisDecl = Actions.ActOnDeclarator(getCurScope(), D); 1734 if (IsForRangeLoop) 1735 Actions.ActOnCXXForRangeDecl(ThisDecl); 1736 Actions.FinalizeDeclaration(ThisDecl); 1737 D.complete(ThisDecl); 1738 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, ThisDecl); 1739 } 1740 1741 SmallVector<Decl *, 8> DeclsInGroup; 1742 Decl *FirstDecl = ParseDeclarationAfterDeclaratorAndAttributes( 1743 D, ParsedTemplateInfo(), FRI); 1744 if (LateParsedAttrs.size() > 0) 1745 ParseLexedAttributeList(LateParsedAttrs, FirstDecl, true, false); 1746 D.complete(FirstDecl); 1747 if (FirstDecl) 1748 DeclsInGroup.push_back(FirstDecl); 1749 1750 bool ExpectSemi = Context != Declarator::ForContext; 1751 1752 // If we don't have a comma, it is either the end of the list (a ';') or an 1753 // error, bail out. 1754 SourceLocation CommaLoc; 1755 while (TryConsumeToken(tok::comma, CommaLoc)) { 1756 if (Tok.isAtStartOfLine() && ExpectSemi && !MightBeDeclarator(Context)) { 1757 // This comma was followed by a line-break and something which can't be 1758 // the start of a declarator. The comma was probably a typo for a 1759 // semicolon. 1760 Diag(CommaLoc, diag::err_expected_semi_declaration) 1761 << FixItHint::CreateReplacement(CommaLoc, ";"); 1762 ExpectSemi = false; 1763 break; 1764 } 1765 1766 // Parse the next declarator. 1767 D.clear(); 1768 D.setCommaLoc(CommaLoc); 1769 1770 // Accept attributes in an init-declarator. In the first declarator in a 1771 // declaration, these would be part of the declspec. In subsequent 1772 // declarators, they become part of the declarator itself, so that they 1773 // don't apply to declarators after *this* one. Examples: 1774 // short __attribute__((common)) var; -> declspec 1775 // short var __attribute__((common)); -> declarator 1776 // short x, __attribute__((common)) var; -> declarator 1777 MaybeParseGNUAttributes(D); 1778 1779 // MSVC parses but ignores qualifiers after the comma as an extension. 1780 if (getLangOpts().MicrosoftExt) 1781 DiagnoseAndSkipExtendedMicrosoftTypeAttributes(); 1782 1783 ParseDeclarator(D); 1784 if (!D.isInvalidType()) { 1785 Decl *ThisDecl = ParseDeclarationAfterDeclarator(D); 1786 D.complete(ThisDecl); 1787 if (ThisDecl) 1788 DeclsInGroup.push_back(ThisDecl); 1789 } 1790 } 1791 1792 if (DeclEnd) 1793 *DeclEnd = Tok.getLocation(); 1794 1795 if (ExpectSemi && 1796 ExpectAndConsumeSemi(Context == Declarator::FileContext 1797 ? diag::err_invalid_token_after_toplevel_declarator 1798 : diag::err_expected_semi_declaration)) { 1799 // Okay, there was no semicolon and one was expected. If we see a 1800 // declaration specifier, just assume it was missing and continue parsing. 1801 // Otherwise things are very confused and we skip to recover. 1802 if (!isDeclarationSpecifier()) { 1803 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); 1804 TryConsumeToken(tok::semi); 1805 } 1806 } 1807 1808 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup); 1809 } 1810 1811 /// Parse an optional simple-asm-expr and attributes, and attach them to a 1812 /// declarator. Returns true on an error. 1813 bool Parser::ParseAsmAttributesAfterDeclarator(Declarator &D) { 1814 // If a simple-asm-expr is present, parse it. 1815 if (Tok.is(tok::kw_asm)) { 1816 SourceLocation Loc; 1817 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1818 if (AsmLabel.isInvalid()) { 1819 SkipUntil(tok::semi, StopBeforeMatch); 1820 return true; 1821 } 1822 1823 D.setAsmLabel(AsmLabel.get()); 1824 D.SetRangeEnd(Loc); 1825 } 1826 1827 MaybeParseGNUAttributes(D); 1828 return false; 1829 } 1830 1831 /// \brief Parse 'declaration' after parsing 'declaration-specifiers 1832 /// declarator'. This method parses the remainder of the declaration 1833 /// (including any attributes or initializer, among other things) and 1834 /// finalizes the declaration. 1835 /// 1836 /// init-declarator: [C99 6.7] 1837 /// declarator 1838 /// declarator '=' initializer 1839 /// [GNU] declarator simple-asm-expr[opt] attributes[opt] 1840 /// [GNU] declarator simple-asm-expr[opt] attributes[opt] '=' initializer 1841 /// [C++] declarator initializer[opt] 1842 /// 1843 /// [C++] initializer: 1844 /// [C++] '=' initializer-clause 1845 /// [C++] '(' expression-list ')' 1846 /// [C++0x] '=' 'default' [TODO] 1847 /// [C++0x] '=' 'delete' 1848 /// [C++0x] braced-init-list 1849 /// 1850 /// According to the standard grammar, =default and =delete are function 1851 /// definitions, but that definitely doesn't fit with the parser here. 1852 /// 1853 Decl *Parser::ParseDeclarationAfterDeclarator( 1854 Declarator &D, const ParsedTemplateInfo &TemplateInfo) { 1855 if (ParseAsmAttributesAfterDeclarator(D)) 1856 return nullptr; 1857 1858 return ParseDeclarationAfterDeclaratorAndAttributes(D, TemplateInfo); 1859 } 1860 1861 Decl *Parser::ParseDeclarationAfterDeclaratorAndAttributes( 1862 Declarator &D, const ParsedTemplateInfo &TemplateInfo, ForRangeInit *FRI) { 1863 // Inform the current actions module that we just parsed this declarator. 1864 Decl *ThisDecl = nullptr; 1865 switch (TemplateInfo.Kind) { 1866 case ParsedTemplateInfo::NonTemplate: 1867 ThisDecl = Actions.ActOnDeclarator(getCurScope(), D); 1868 break; 1869 1870 case ParsedTemplateInfo::Template: 1871 case ParsedTemplateInfo::ExplicitSpecialization: { 1872 ThisDecl = Actions.ActOnTemplateDeclarator(getCurScope(), 1873 *TemplateInfo.TemplateParams, 1874 D); 1875 if (VarTemplateDecl *VT = dyn_cast_or_null<VarTemplateDecl>(ThisDecl)) 1876 // Re-direct this decl to refer to the templated decl so that we can 1877 // initialize it. 1878 ThisDecl = VT->getTemplatedDecl(); 1879 break; 1880 } 1881 case ParsedTemplateInfo::ExplicitInstantiation: { 1882 if (Tok.is(tok::semi)) { 1883 DeclResult ThisRes = Actions.ActOnExplicitInstantiation( 1884 getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc, D); 1885 if (ThisRes.isInvalid()) { 1886 SkipUntil(tok::semi, StopBeforeMatch); 1887 return nullptr; 1888 } 1889 ThisDecl = ThisRes.get(); 1890 } else { 1891 // FIXME: This check should be for a variable template instantiation only. 1892 1893 // Check that this is a valid instantiation 1894 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 1895 // If the declarator-id is not a template-id, issue a diagnostic and 1896 // recover by ignoring the 'template' keyword. 1897 Diag(Tok, diag::err_template_defn_explicit_instantiation) 1898 << 2 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc); 1899 ThisDecl = Actions.ActOnDeclarator(getCurScope(), D); 1900 } else { 1901 SourceLocation LAngleLoc = 1902 PP.getLocForEndOfToken(TemplateInfo.TemplateLoc); 1903 Diag(D.getIdentifierLoc(), 1904 diag::err_explicit_instantiation_with_definition) 1905 << SourceRange(TemplateInfo.TemplateLoc) 1906 << FixItHint::CreateInsertion(LAngleLoc, "<>"); 1907 1908 // Recover as if it were an explicit specialization. 1909 TemplateParameterLists FakedParamLists; 1910 FakedParamLists.push_back(Actions.ActOnTemplateParameterList( 1911 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, nullptr, 1912 0, LAngleLoc)); 1913 1914 ThisDecl = 1915 Actions.ActOnTemplateDeclarator(getCurScope(), FakedParamLists, D); 1916 } 1917 } 1918 break; 1919 } 1920 } 1921 1922 bool TypeContainsAuto = D.getDeclSpec().containsPlaceholderType(); 1923 1924 // Parse declarator '=' initializer. 1925 // If a '==' or '+=' is found, suggest a fixit to '='. 1926 if (isTokenEqualOrEqualTypo()) { 1927 SourceLocation EqualLoc = ConsumeToken(); 1928 1929 if (Tok.is(tok::kw_delete)) { 1930 if (D.isFunctionDeclarator()) 1931 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 1932 << 1 /* delete */; 1933 else 1934 Diag(ConsumeToken(), diag::err_deleted_non_function); 1935 } else if (Tok.is(tok::kw_default)) { 1936 if (D.isFunctionDeclarator()) 1937 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration) 1938 << 0 /* default */; 1939 else 1940 Diag(ConsumeToken(), diag::err_default_special_members); 1941 } else { 1942 if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) { 1943 EnterScope(0); 1944 Actions.ActOnCXXEnterDeclInitializer(getCurScope(), ThisDecl); 1945 } 1946 1947 if (Tok.is(tok::code_completion)) { 1948 Actions.CodeCompleteInitializer(getCurScope(), ThisDecl); 1949 Actions.FinalizeDeclaration(ThisDecl); 1950 cutOffParsing(); 1951 return nullptr; 1952 } 1953 1954 ExprResult Init(ParseInitializer()); 1955 1956 // If this is the only decl in (possibly) range based for statement, 1957 // our best guess is that the user meant ':' instead of '='. 1958 if (Tok.is(tok::r_paren) && FRI && D.isFirstDeclarator()) { 1959 Diag(EqualLoc, diag::err_single_decl_assign_in_for_range) 1960 << FixItHint::CreateReplacement(EqualLoc, ":"); 1961 // We are trying to stop parser from looking for ';' in this for 1962 // statement, therefore preventing spurious errors to be issued. 1963 FRI->ColonLoc = EqualLoc; 1964 Init = ExprError(); 1965 FRI->RangeExpr = Init; 1966 } 1967 1968 if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) { 1969 Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl); 1970 ExitScope(); 1971 } 1972 1973 if (Init.isInvalid()) { 1974 SmallVector<tok::TokenKind, 2> StopTokens; 1975 StopTokens.push_back(tok::comma); 1976 if (D.getContext() == Declarator::ForContext) 1977 StopTokens.push_back(tok::r_paren); 1978 SkipUntil(StopTokens, StopAtSemi | StopBeforeMatch); 1979 Actions.ActOnInitializerError(ThisDecl); 1980 } else 1981 Actions.AddInitializerToDecl(ThisDecl, Init.get(), 1982 /*DirectInit=*/false, TypeContainsAuto); 1983 } 1984 } else if (Tok.is(tok::l_paren)) { 1985 // Parse C++ direct initializer: '(' expression-list ')' 1986 BalancedDelimiterTracker T(*this, tok::l_paren); 1987 T.consumeOpen(); 1988 1989 ExprVector Exprs; 1990 CommaLocsTy CommaLocs; 1991 1992 if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) { 1993 EnterScope(0); 1994 Actions.ActOnCXXEnterDeclInitializer(getCurScope(), ThisDecl); 1995 } 1996 1997 if (ParseExpressionList(Exprs, CommaLocs, [&] { 1998 Actions.CodeCompleteConstructor(getCurScope(), 1999 cast<VarDecl>(ThisDecl)->getType()->getCanonicalTypeInternal(), 2000 ThisDecl->getLocation(), Exprs); 2001 })) { 2002 Actions.ActOnInitializerError(ThisDecl); 2003 SkipUntil(tok::r_paren, StopAtSemi); 2004 2005 if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) { 2006 Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl); 2007 ExitScope(); 2008 } 2009 } else { 2010 // Match the ')'. 2011 T.consumeClose(); 2012 2013 assert(!Exprs.empty() && Exprs.size()-1 == CommaLocs.size() && 2014 "Unexpected number of commas!"); 2015 2016 if (getLangOpts().CPlusPlus && D.getCXXScopeSpec().isSet()) { 2017 Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl); 2018 ExitScope(); 2019 } 2020 2021 ExprResult Initializer = Actions.ActOnParenListExpr(T.getOpenLocation(), 2022 T.getCloseLocation(), 2023 Exprs); 2024 Actions.AddInitializerToDecl(ThisDecl, Initializer.get(), 2025 /*DirectInit=*/true, TypeContainsAuto); 2026 } 2027 } else if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace) && 2028 (!CurParsedObjCImpl || !D.isFunctionDeclarator())) { 2029 // Parse C++0x braced-init-list. 2030 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2031 2032 if (D.getCXXScopeSpec().isSet()) { 2033 EnterScope(0); 2034 Actions.ActOnCXXEnterDeclInitializer(getCurScope(), ThisDecl); 2035 } 2036 2037 ExprResult Init(ParseBraceInitializer()); 2038 2039 if (D.getCXXScopeSpec().isSet()) { 2040 Actions.ActOnCXXExitDeclInitializer(getCurScope(), ThisDecl); 2041 ExitScope(); 2042 } 2043 2044 if (Init.isInvalid()) { 2045 Actions.ActOnInitializerError(ThisDecl); 2046 } else 2047 Actions.AddInitializerToDecl(ThisDecl, Init.get(), 2048 /*DirectInit=*/true, TypeContainsAuto); 2049 2050 } else { 2051 Actions.ActOnUninitializedDecl(ThisDecl, TypeContainsAuto); 2052 } 2053 2054 Actions.FinalizeDeclaration(ThisDecl); 2055 2056 return ThisDecl; 2057 } 2058 2059 /// ParseSpecifierQualifierList 2060 /// specifier-qualifier-list: 2061 /// type-specifier specifier-qualifier-list[opt] 2062 /// type-qualifier specifier-qualifier-list[opt] 2063 /// [GNU] attributes specifier-qualifier-list[opt] 2064 /// 2065 void Parser::ParseSpecifierQualifierList(DeclSpec &DS, AccessSpecifier AS, 2066 DeclSpecContext DSC) { 2067 /// specifier-qualifier-list is a subset of declaration-specifiers. Just 2068 /// parse declaration-specifiers and complain about extra stuff. 2069 /// TODO: diagnose attribute-specifiers and alignment-specifiers. 2070 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC); 2071 2072 // Validate declspec for type-name. 2073 unsigned Specs = DS.getParsedSpecifiers(); 2074 if (isTypeSpecifier(DSC) && !DS.hasTypeSpecifier()) { 2075 Diag(Tok, diag::err_expected_type); 2076 DS.SetTypeSpecError(); 2077 } else if (Specs == DeclSpec::PQ_None && !DS.getNumProtocolQualifiers() && 2078 !DS.hasAttributes()) { 2079 Diag(Tok, diag::err_typename_requires_specqual); 2080 if (!DS.hasTypeSpecifier()) 2081 DS.SetTypeSpecError(); 2082 } 2083 2084 // Issue diagnostic and remove storage class if present. 2085 if (Specs & DeclSpec::PQ_StorageClassSpecifier) { 2086 if (DS.getStorageClassSpecLoc().isValid()) 2087 Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass); 2088 else 2089 Diag(DS.getThreadStorageClassSpecLoc(), 2090 diag::err_typename_invalid_storageclass); 2091 DS.ClearStorageClassSpecs(); 2092 } 2093 2094 // Issue diagnostic and remove function specfier if present. 2095 if (Specs & DeclSpec::PQ_FunctionSpecifier) { 2096 if (DS.isInlineSpecified()) 2097 Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec); 2098 if (DS.isVirtualSpecified()) 2099 Diag(DS.getVirtualSpecLoc(), diag::err_typename_invalid_functionspec); 2100 if (DS.isExplicitSpecified()) 2101 Diag(DS.getExplicitSpecLoc(), diag::err_typename_invalid_functionspec); 2102 DS.ClearFunctionSpecs(); 2103 } 2104 2105 // Issue diagnostic and remove constexpr specfier if present. 2106 if (DS.isConstexprSpecified()) { 2107 Diag(DS.getConstexprSpecLoc(), diag::err_typename_invalid_constexpr); 2108 DS.ClearConstexprSpec(); 2109 } 2110 } 2111 2112 /// isValidAfterIdentifierInDeclaratorAfterDeclSpec - Return true if the 2113 /// specified token is valid after the identifier in a declarator which 2114 /// immediately follows the declspec. For example, these things are valid: 2115 /// 2116 /// int x [ 4]; // direct-declarator 2117 /// int x ( int y); // direct-declarator 2118 /// int(int x ) // direct-declarator 2119 /// int x ; // simple-declaration 2120 /// int x = 17; // init-declarator-list 2121 /// int x , y; // init-declarator-list 2122 /// int x __asm__ ("foo"); // init-declarator-list 2123 /// int x : 4; // struct-declarator 2124 /// int x { 5}; // C++'0x unified initializers 2125 /// 2126 /// This is not, because 'x' does not immediately follow the declspec (though 2127 /// ')' happens to be valid anyway). 2128 /// int (x) 2129 /// 2130 static bool isValidAfterIdentifierInDeclarator(const Token &T) { 2131 return T.is(tok::l_square) || T.is(tok::l_paren) || T.is(tok::r_paren) || 2132 T.is(tok::semi) || T.is(tok::comma) || T.is(tok::equal) || 2133 T.is(tok::kw_asm) || T.is(tok::l_brace) || T.is(tok::colon); 2134 } 2135 2136 2137 /// ParseImplicitInt - This method is called when we have an non-typename 2138 /// identifier in a declspec (which normally terminates the decl spec) when 2139 /// the declspec has no type specifier. In this case, the declspec is either 2140 /// malformed or is "implicit int" (in K&R and C89). 2141 /// 2142 /// This method handles diagnosing this prettily and returns false if the 2143 /// declspec is done being processed. If it recovers and thinks there may be 2144 /// other pieces of declspec after it, it returns true. 2145 /// 2146 bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS, 2147 const ParsedTemplateInfo &TemplateInfo, 2148 AccessSpecifier AS, DeclSpecContext DSC, 2149 ParsedAttributesWithRange &Attrs) { 2150 assert(Tok.is(tok::identifier) && "should have identifier"); 2151 2152 SourceLocation Loc = Tok.getLocation(); 2153 // If we see an identifier that is not a type name, we normally would 2154 // parse it as the identifer being declared. However, when a typename 2155 // is typo'd or the definition is not included, this will incorrectly 2156 // parse the typename as the identifier name and fall over misparsing 2157 // later parts of the diagnostic. 2158 // 2159 // As such, we try to do some look-ahead in cases where this would 2160 // otherwise be an "implicit-int" case to see if this is invalid. For 2161 // example: "static foo_t x = 4;" In this case, if we parsed foo_t as 2162 // an identifier with implicit int, we'd get a parse error because the 2163 // next token is obviously invalid for a type. Parse these as a case 2164 // with an invalid type specifier. 2165 assert(!DS.hasTypeSpecifier() && "Type specifier checked above"); 2166 2167 // Since we know that this either implicit int (which is rare) or an 2168 // error, do lookahead to try to do better recovery. This never applies 2169 // within a type specifier. Outside of C++, we allow this even if the 2170 // language doesn't "officially" support implicit int -- we support 2171 // implicit int as an extension in C99 and C11. 2172 if (!isTypeSpecifier(DSC) && !getLangOpts().CPlusPlus && 2173 isValidAfterIdentifierInDeclarator(NextToken())) { 2174 // If this token is valid for implicit int, e.g. "static x = 4", then 2175 // we just avoid eating the identifier, so it will be parsed as the 2176 // identifier in the declarator. 2177 return false; 2178 } 2179 2180 if (getLangOpts().CPlusPlus && 2181 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 2182 // Don't require a type specifier if we have the 'auto' storage class 2183 // specifier in C++98 -- we'll promote it to a type specifier. 2184 if (SS) 2185 AnnotateScopeToken(*SS, /*IsNewAnnotation*/false); 2186 return false; 2187 } 2188 2189 // Otherwise, if we don't consume this token, we are going to emit an 2190 // error anyway. Try to recover from various common problems. Check 2191 // to see if this was a reference to a tag name without a tag specified. 2192 // This is a common problem in C (saying 'foo' instead of 'struct foo'). 2193 // 2194 // C++ doesn't need this, and isTagName doesn't take SS. 2195 if (SS == nullptr) { 2196 const char *TagName = nullptr, *FixitTagName = nullptr; 2197 tok::TokenKind TagKind = tok::unknown; 2198 2199 switch (Actions.isTagName(*Tok.getIdentifierInfo(), getCurScope())) { 2200 default: break; 2201 case DeclSpec::TST_enum: 2202 TagName="enum" ; FixitTagName = "enum " ; TagKind=tok::kw_enum ;break; 2203 case DeclSpec::TST_union: 2204 TagName="union" ; FixitTagName = "union " ;TagKind=tok::kw_union ;break; 2205 case DeclSpec::TST_struct: 2206 TagName="struct"; FixitTagName = "struct ";TagKind=tok::kw_struct;break; 2207 case DeclSpec::TST_interface: 2208 TagName="__interface"; FixitTagName = "__interface "; 2209 TagKind=tok::kw___interface;break; 2210 case DeclSpec::TST_class: 2211 TagName="class" ; FixitTagName = "class " ;TagKind=tok::kw_class ;break; 2212 } 2213 2214 if (TagName) { 2215 IdentifierInfo *TokenName = Tok.getIdentifierInfo(); 2216 LookupResult R(Actions, TokenName, SourceLocation(), 2217 Sema::LookupOrdinaryName); 2218 2219 Diag(Loc, diag::err_use_of_tag_name_without_tag) 2220 << TokenName << TagName << getLangOpts().CPlusPlus 2221 << FixItHint::CreateInsertion(Tok.getLocation(), FixitTagName); 2222 2223 if (Actions.LookupParsedName(R, getCurScope(), SS)) { 2224 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); 2225 I != IEnd; ++I) 2226 Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type) 2227 << TokenName << TagName; 2228 } 2229 2230 // Parse this as a tag as if the missing tag were present. 2231 if (TagKind == tok::kw_enum) 2232 ParseEnumSpecifier(Loc, DS, TemplateInfo, AS, DSC_normal); 2233 else 2234 ParseClassSpecifier(TagKind, Loc, DS, TemplateInfo, AS, 2235 /*EnteringContext*/ false, DSC_normal, Attrs); 2236 return true; 2237 } 2238 } 2239 2240 // Determine whether this identifier could plausibly be the name of something 2241 // being declared (with a missing type). 2242 if (!isTypeSpecifier(DSC) && 2243 (!SS || DSC == DSC_top_level || DSC == DSC_class)) { 2244 // Look ahead to the next token to try to figure out what this declaration 2245 // was supposed to be. 2246 switch (NextToken().getKind()) { 2247 case tok::l_paren: { 2248 // static x(4); // 'x' is not a type 2249 // x(int n); // 'x' is not a type 2250 // x (*p)[]; // 'x' is a type 2251 // 2252 // Since we're in an error case, we can afford to perform a tentative 2253 // parse to determine which case we're in. 2254 TentativeParsingAction PA(*this); 2255 ConsumeToken(); 2256 TPResult TPR = TryParseDeclarator(/*mayBeAbstract*/false); 2257 PA.Revert(); 2258 2259 if (TPR != TPResult::False) { 2260 // The identifier is followed by a parenthesized declarator. 2261 // It's supposed to be a type. 2262 break; 2263 } 2264 2265 // If we're in a context where we could be declaring a constructor, 2266 // check whether this is a constructor declaration with a bogus name. 2267 if (DSC == DSC_class || (DSC == DSC_top_level && SS)) { 2268 IdentifierInfo *II = Tok.getIdentifierInfo(); 2269 if (Actions.isCurrentClassNameTypo(II, SS)) { 2270 Diag(Loc, diag::err_constructor_bad_name) 2271 << Tok.getIdentifierInfo() << II 2272 << FixItHint::CreateReplacement(Tok.getLocation(), II->getName()); 2273 Tok.setIdentifierInfo(II); 2274 } 2275 } 2276 // Fall through. 2277 } 2278 case tok::comma: 2279 case tok::equal: 2280 case tok::kw_asm: 2281 case tok::l_brace: 2282 case tok::l_square: 2283 case tok::semi: 2284 // This looks like a variable or function declaration. The type is 2285 // probably missing. We're done parsing decl-specifiers. 2286 if (SS) 2287 AnnotateScopeToken(*SS, /*IsNewAnnotation*/false); 2288 return false; 2289 2290 default: 2291 // This is probably supposed to be a type. This includes cases like: 2292 // int f(itn); 2293 // struct S { unsinged : 4; }; 2294 break; 2295 } 2296 } 2297 2298 // This is almost certainly an invalid type name. Let Sema emit a diagnostic 2299 // and attempt to recover. 2300 ParsedType T; 2301 IdentifierInfo *II = Tok.getIdentifierInfo(); 2302 Actions.DiagnoseUnknownTypeName(II, Loc, getCurScope(), SS, T, 2303 getLangOpts().CPlusPlus && 2304 NextToken().is(tok::less)); 2305 if (T) { 2306 // The action has suggested that the type T could be used. Set that as 2307 // the type in the declaration specifiers, consume the would-be type 2308 // name token, and we're done. 2309 const char *PrevSpec; 2310 unsigned DiagID; 2311 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T, 2312 Actions.getASTContext().getPrintingPolicy()); 2313 DS.SetRangeEnd(Tok.getLocation()); 2314 ConsumeToken(); 2315 // There may be other declaration specifiers after this. 2316 return true; 2317 } else if (II != Tok.getIdentifierInfo()) { 2318 // If no type was suggested, the correction is to a keyword 2319 Tok.setKind(II->getTokenID()); 2320 // There may be other declaration specifiers after this. 2321 return true; 2322 } 2323 2324 // Otherwise, the action had no suggestion for us. Mark this as an error. 2325 DS.SetTypeSpecError(); 2326 DS.SetRangeEnd(Tok.getLocation()); 2327 ConsumeToken(); 2328 2329 // TODO: Could inject an invalid typedef decl in an enclosing scope to 2330 // avoid rippling error messages on subsequent uses of the same type, 2331 // could be useful if #include was forgotten. 2332 return false; 2333 } 2334 2335 /// \brief Determine the declaration specifier context from the declarator 2336 /// context. 2337 /// 2338 /// \param Context the declarator context, which is one of the 2339 /// Declarator::TheContext enumerator values. 2340 Parser::DeclSpecContext 2341 Parser::getDeclSpecContextFromDeclaratorContext(unsigned Context) { 2342 if (Context == Declarator::MemberContext) 2343 return DSC_class; 2344 if (Context == Declarator::FileContext) 2345 return DSC_top_level; 2346 if (Context == Declarator::TemplateTypeArgContext) 2347 return DSC_template_type_arg; 2348 if (Context == Declarator::TrailingReturnContext) 2349 return DSC_trailing; 2350 if (Context == Declarator::AliasDeclContext || 2351 Context == Declarator::AliasTemplateContext) 2352 return DSC_alias_declaration; 2353 return DSC_normal; 2354 } 2355 2356 /// ParseAlignArgument - Parse the argument to an alignment-specifier. 2357 /// 2358 /// FIXME: Simply returns an alignof() expression if the argument is a 2359 /// type. Ideally, the type should be propagated directly into Sema. 2360 /// 2361 /// [C11] type-id 2362 /// [C11] constant-expression 2363 /// [C++0x] type-id ...[opt] 2364 /// [C++0x] assignment-expression ...[opt] 2365 ExprResult Parser::ParseAlignArgument(SourceLocation Start, 2366 SourceLocation &EllipsisLoc) { 2367 ExprResult ER; 2368 if (isTypeIdInParens()) { 2369 SourceLocation TypeLoc = Tok.getLocation(); 2370 ParsedType Ty = ParseTypeName().get(); 2371 SourceRange TypeRange(Start, Tok.getLocation()); 2372 ER = Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true, 2373 Ty.getAsOpaquePtr(), TypeRange); 2374 } else 2375 ER = ParseConstantExpression(); 2376 2377 if (getLangOpts().CPlusPlus11) 2378 TryConsumeToken(tok::ellipsis, EllipsisLoc); 2379 2380 return ER; 2381 } 2382 2383 /// ParseAlignmentSpecifier - Parse an alignment-specifier, and add the 2384 /// attribute to Attrs. 2385 /// 2386 /// alignment-specifier: 2387 /// [C11] '_Alignas' '(' type-id ')' 2388 /// [C11] '_Alignas' '(' constant-expression ')' 2389 /// [C++11] 'alignas' '(' type-id ...[opt] ')' 2390 /// [C++11] 'alignas' '(' assignment-expression ...[opt] ')' 2391 void Parser::ParseAlignmentSpecifier(ParsedAttributes &Attrs, 2392 SourceLocation *EndLoc) { 2393 assert((Tok.is(tok::kw_alignas) || Tok.is(tok::kw__Alignas)) && 2394 "Not an alignment-specifier!"); 2395 2396 IdentifierInfo *KWName = Tok.getIdentifierInfo(); 2397 SourceLocation KWLoc = ConsumeToken(); 2398 2399 BalancedDelimiterTracker T(*this, tok::l_paren); 2400 if (T.expectAndConsume()) 2401 return; 2402 2403 SourceLocation EllipsisLoc; 2404 ExprResult ArgExpr = ParseAlignArgument(T.getOpenLocation(), EllipsisLoc); 2405 if (ArgExpr.isInvalid()) { 2406 T.skipToEnd(); 2407 return; 2408 } 2409 2410 T.consumeClose(); 2411 if (EndLoc) 2412 *EndLoc = T.getCloseLocation(); 2413 2414 ArgsVector ArgExprs; 2415 ArgExprs.push_back(ArgExpr.get()); 2416 Attrs.addNew(KWName, KWLoc, nullptr, KWLoc, ArgExprs.data(), 1, 2417 AttributeList::AS_Keyword, EllipsisLoc); 2418 } 2419 2420 /// Determine whether we're looking at something that might be a declarator 2421 /// in a simple-declaration. If it can't possibly be a declarator, maybe 2422 /// diagnose a missing semicolon after a prior tag definition in the decl 2423 /// specifier. 2424 /// 2425 /// \return \c true if an error occurred and this can't be any kind of 2426 /// declaration. 2427 bool 2428 Parser::DiagnoseMissingSemiAfterTagDefinition(DeclSpec &DS, AccessSpecifier AS, 2429 DeclSpecContext DSContext, 2430 LateParsedAttrList *LateAttrs) { 2431 assert(DS.hasTagDefinition() && "shouldn't call this"); 2432 2433 bool EnteringContext = (DSContext == DSC_class || DSContext == DSC_top_level); 2434 2435 if (getLangOpts().CPlusPlus && 2436 (Tok.is(tok::identifier) || Tok.is(tok::coloncolon) || 2437 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id)) && 2438 TryAnnotateCXXScopeToken(EnteringContext)) { 2439 SkipMalformedDecl(); 2440 return true; 2441 } 2442 2443 bool HasScope = Tok.is(tok::annot_cxxscope); 2444 // Make a copy in case GetLookAheadToken invalidates the result of NextToken. 2445 Token AfterScope = HasScope ? NextToken() : Tok; 2446 2447 // Determine whether the following tokens could possibly be a 2448 // declarator. 2449 bool MightBeDeclarator = true; 2450 if (Tok.is(tok::kw_typename) || Tok.is(tok::annot_typename)) { 2451 // A declarator-id can't start with 'typename'. 2452 MightBeDeclarator = false; 2453 } else if (AfterScope.is(tok::annot_template_id)) { 2454 // If we have a type expressed as a template-id, this cannot be a 2455 // declarator-id (such a type cannot be redeclared in a simple-declaration). 2456 TemplateIdAnnotation *Annot = 2457 static_cast<TemplateIdAnnotation *>(AfterScope.getAnnotationValue()); 2458 if (Annot->Kind == TNK_Type_template) 2459 MightBeDeclarator = false; 2460 } else if (AfterScope.is(tok::identifier)) { 2461 const Token &Next = HasScope ? GetLookAheadToken(2) : NextToken(); 2462 2463 // These tokens cannot come after the declarator-id in a 2464 // simple-declaration, and are likely to come after a type-specifier. 2465 if (Next.is(tok::star) || Next.is(tok::amp) || Next.is(tok::ampamp) || 2466 Next.is(tok::identifier) || Next.is(tok::annot_cxxscope) || 2467 Next.is(tok::coloncolon)) { 2468 // Missing a semicolon. 2469 MightBeDeclarator = false; 2470 } else if (HasScope) { 2471 // If the declarator-id has a scope specifier, it must redeclare a 2472 // previously-declared entity. If that's a type (and this is not a 2473 // typedef), that's an error. 2474 CXXScopeSpec SS; 2475 Actions.RestoreNestedNameSpecifierAnnotation( 2476 Tok.getAnnotationValue(), Tok.getAnnotationRange(), SS); 2477 IdentifierInfo *Name = AfterScope.getIdentifierInfo(); 2478 Sema::NameClassification Classification = Actions.ClassifyName( 2479 getCurScope(), SS, Name, AfterScope.getLocation(), Next, 2480 /*IsAddressOfOperand*/false); 2481 switch (Classification.getKind()) { 2482 case Sema::NC_Error: 2483 SkipMalformedDecl(); 2484 return true; 2485 2486 case Sema::NC_Keyword: 2487 case Sema::NC_NestedNameSpecifier: 2488 llvm_unreachable("typo correction and nested name specifiers not " 2489 "possible here"); 2490 2491 case Sema::NC_Type: 2492 case Sema::NC_TypeTemplate: 2493 // Not a previously-declared non-type entity. 2494 MightBeDeclarator = false; 2495 break; 2496 2497 case Sema::NC_Unknown: 2498 case Sema::NC_Expression: 2499 case Sema::NC_VarTemplate: 2500 case Sema::NC_FunctionTemplate: 2501 // Might be a redeclaration of a prior entity. 2502 break; 2503 } 2504 } 2505 } 2506 2507 if (MightBeDeclarator) 2508 return false; 2509 2510 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy(); 2511 Diag(PP.getLocForEndOfToken(DS.getRepAsDecl()->getLocEnd()), 2512 diag::err_expected_after) 2513 << DeclSpec::getSpecifierName(DS.getTypeSpecType(), PPol) << tok::semi; 2514 2515 // Try to recover from the typo, by dropping the tag definition and parsing 2516 // the problematic tokens as a type. 2517 // 2518 // FIXME: Split the DeclSpec into pieces for the standalone 2519 // declaration and pieces for the following declaration, instead 2520 // of assuming that all the other pieces attach to new declaration, 2521 // and call ParsedFreeStandingDeclSpec as appropriate. 2522 DS.ClearTypeSpecType(); 2523 ParsedTemplateInfo NotATemplate; 2524 ParseDeclarationSpecifiers(DS, NotATemplate, AS, DSContext, LateAttrs); 2525 return false; 2526 } 2527 2528 /// ParseDeclarationSpecifiers 2529 /// declaration-specifiers: [C99 6.7] 2530 /// storage-class-specifier declaration-specifiers[opt] 2531 /// type-specifier declaration-specifiers[opt] 2532 /// [C99] function-specifier declaration-specifiers[opt] 2533 /// [C11] alignment-specifier declaration-specifiers[opt] 2534 /// [GNU] attributes declaration-specifiers[opt] 2535 /// [Clang] '__module_private__' declaration-specifiers[opt] 2536 /// 2537 /// storage-class-specifier: [C99 6.7.1] 2538 /// 'typedef' 2539 /// 'extern' 2540 /// 'static' 2541 /// 'auto' 2542 /// 'register' 2543 /// [C++] 'mutable' 2544 /// [C++11] 'thread_local' 2545 /// [C11] '_Thread_local' 2546 /// [GNU] '__thread' 2547 /// function-specifier: [C99 6.7.4] 2548 /// [C99] 'inline' 2549 /// [C++] 'virtual' 2550 /// [C++] 'explicit' 2551 /// [OpenCL] '__kernel' 2552 /// 'friend': [C++ dcl.friend] 2553 /// 'constexpr': [C++0x dcl.constexpr] 2554 2555 /// 2556 void Parser::ParseDeclarationSpecifiers(DeclSpec &DS, 2557 const ParsedTemplateInfo &TemplateInfo, 2558 AccessSpecifier AS, 2559 DeclSpecContext DSContext, 2560 LateParsedAttrList *LateAttrs) { 2561 if (DS.getSourceRange().isInvalid()) { 2562 // Start the range at the current token but make the end of the range 2563 // invalid. This will make the entire range invalid unless we successfully 2564 // consume a token. 2565 DS.SetRangeStart(Tok.getLocation()); 2566 DS.SetRangeEnd(SourceLocation()); 2567 } 2568 2569 bool EnteringContext = (DSContext == DSC_class || DSContext == DSC_top_level); 2570 bool AttrsLastTime = false; 2571 ParsedAttributesWithRange attrs(AttrFactory); 2572 // We use Sema's policy to get bool macros right. 2573 const PrintingPolicy &Policy = Actions.getPrintingPolicy(); 2574 while (1) { 2575 bool isInvalid = false; 2576 bool isStorageClass = false; 2577 const char *PrevSpec = nullptr; 2578 unsigned DiagID = 0; 2579 2580 SourceLocation Loc = Tok.getLocation(); 2581 2582 switch (Tok.getKind()) { 2583 default: 2584 DoneWithDeclSpec: 2585 if (!AttrsLastTime) 2586 ProhibitAttributes(attrs); 2587 else { 2588 // Reject C++11 attributes that appertain to decl specifiers as 2589 // we don't support any C++11 attributes that appertain to decl 2590 // specifiers. This also conforms to what g++ 4.8 is doing. 2591 ProhibitCXX11Attributes(attrs); 2592 2593 DS.takeAttributesFrom(attrs); 2594 } 2595 2596 // If this is not a declaration specifier token, we're done reading decl 2597 // specifiers. First verify that DeclSpec's are consistent. 2598 DS.Finish(Diags, PP, Policy); 2599 return; 2600 2601 case tok::l_square: 2602 case tok::kw_alignas: 2603 if (!getLangOpts().CPlusPlus11 || !isCXX11AttributeSpecifier()) 2604 goto DoneWithDeclSpec; 2605 2606 ProhibitAttributes(attrs); 2607 // FIXME: It would be good to recover by accepting the attributes, 2608 // but attempting to do that now would cause serious 2609 // madness in terms of diagnostics. 2610 attrs.clear(); 2611 attrs.Range = SourceRange(); 2612 2613 ParseCXX11Attributes(attrs); 2614 AttrsLastTime = true; 2615 continue; 2616 2617 case tok::code_completion: { 2618 Sema::ParserCompletionContext CCC = Sema::PCC_Namespace; 2619 if (DS.hasTypeSpecifier()) { 2620 bool AllowNonIdentifiers 2621 = (getCurScope()->getFlags() & (Scope::ControlScope | 2622 Scope::BlockScope | 2623 Scope::TemplateParamScope | 2624 Scope::FunctionPrototypeScope | 2625 Scope::AtCatchScope)) == 0; 2626 bool AllowNestedNameSpecifiers 2627 = DSContext == DSC_top_level || 2628 (DSContext == DSC_class && DS.isFriendSpecified()); 2629 2630 Actions.CodeCompleteDeclSpec(getCurScope(), DS, 2631 AllowNonIdentifiers, 2632 AllowNestedNameSpecifiers); 2633 return cutOffParsing(); 2634 } 2635 2636 if (getCurScope()->getFnParent() || getCurScope()->getBlockParent()) 2637 CCC = Sema::PCC_LocalDeclarationSpecifiers; 2638 else if (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate) 2639 CCC = DSContext == DSC_class? Sema::PCC_MemberTemplate 2640 : Sema::PCC_Template; 2641 else if (DSContext == DSC_class) 2642 CCC = Sema::PCC_Class; 2643 else if (CurParsedObjCImpl) 2644 CCC = Sema::PCC_ObjCImplementation; 2645 2646 Actions.CodeCompleteOrdinaryName(getCurScope(), CCC); 2647 return cutOffParsing(); 2648 } 2649 2650 case tok::coloncolon: // ::foo::bar 2651 // C++ scope specifier. Annotate and loop, or bail out on error. 2652 if (TryAnnotateCXXScopeToken(EnteringContext)) { 2653 if (!DS.hasTypeSpecifier()) 2654 DS.SetTypeSpecError(); 2655 goto DoneWithDeclSpec; 2656 } 2657 if (Tok.is(tok::coloncolon)) // ::new or ::delete 2658 goto DoneWithDeclSpec; 2659 continue; 2660 2661 case tok::annot_cxxscope: { 2662 if (DS.hasTypeSpecifier() || DS.isTypeAltiVecVector()) 2663 goto DoneWithDeclSpec; 2664 2665 CXXScopeSpec SS; 2666 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(), 2667 Tok.getAnnotationRange(), 2668 SS); 2669 2670 // We are looking for a qualified typename. 2671 Token Next = NextToken(); 2672 if (Next.is(tok::annot_template_id) && 2673 static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue()) 2674 ->Kind == TNK_Type_template) { 2675 // We have a qualified template-id, e.g., N::A<int> 2676 2677 // C++ [class.qual]p2: 2678 // In a lookup in which the constructor is an acceptable lookup 2679 // result and the nested-name-specifier nominates a class C: 2680 // 2681 // - if the name specified after the 2682 // nested-name-specifier, when looked up in C, is the 2683 // injected-class-name of C (Clause 9), or 2684 // 2685 // - if the name specified after the nested-name-specifier 2686 // is the same as the identifier or the 2687 // simple-template-id's template-name in the last 2688 // component of the nested-name-specifier, 2689 // 2690 // the name is instead considered to name the constructor of 2691 // class C. 2692 // 2693 // Thus, if the template-name is actually the constructor 2694 // name, then the code is ill-formed; this interpretation is 2695 // reinforced by the NAD status of core issue 635. 2696 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next); 2697 if ((DSContext == DSC_top_level || DSContext == DSC_class) && 2698 TemplateId->Name && 2699 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) { 2700 if (isConstructorDeclarator(/*Unqualified*/false)) { 2701 // The user meant this to be an out-of-line constructor 2702 // definition, but template arguments are not allowed 2703 // there. Just allow this as a constructor; we'll 2704 // complain about it later. 2705 goto DoneWithDeclSpec; 2706 } 2707 2708 // The user meant this to name a type, but it actually names 2709 // a constructor with some extraneous template 2710 // arguments. Complain, then parse it as a type as the user 2711 // intended. 2712 Diag(TemplateId->TemplateNameLoc, 2713 diag::err_out_of_line_template_id_names_constructor) 2714 << TemplateId->Name; 2715 } 2716 2717 DS.getTypeSpecScope() = SS; 2718 ConsumeToken(); // The C++ scope. 2719 assert(Tok.is(tok::annot_template_id) && 2720 "ParseOptionalCXXScopeSpecifier not working"); 2721 AnnotateTemplateIdTokenAsType(); 2722 continue; 2723 } 2724 2725 if (Next.is(tok::annot_typename)) { 2726 DS.getTypeSpecScope() = SS; 2727 ConsumeToken(); // The C++ scope. 2728 if (Tok.getAnnotationValue()) { 2729 ParsedType T = getTypeAnnotation(Tok); 2730 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, 2731 Tok.getAnnotationEndLoc(), 2732 PrevSpec, DiagID, T, Policy); 2733 if (isInvalid) 2734 break; 2735 } 2736 else 2737 DS.SetTypeSpecError(); 2738 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 2739 ConsumeToken(); // The typename 2740 } 2741 2742 if (Next.isNot(tok::identifier)) 2743 goto DoneWithDeclSpec; 2744 2745 // If we're in a context where the identifier could be a class name, 2746 // check whether this is a constructor declaration. 2747 if ((DSContext == DSC_top_level || DSContext == DSC_class) && 2748 Actions.isCurrentClassName(*Next.getIdentifierInfo(), getCurScope(), 2749 &SS)) { 2750 if (isConstructorDeclarator(/*Unqualified*/false)) 2751 goto DoneWithDeclSpec; 2752 2753 // As noted in C++ [class.qual]p2 (cited above), when the name 2754 // of the class is qualified in a context where it could name 2755 // a constructor, its a constructor name. However, we've 2756 // looked at the declarator, and the user probably meant this 2757 // to be a type. Complain that it isn't supposed to be treated 2758 // as a type, then proceed to parse it as a type. 2759 Diag(Next.getLocation(), diag::err_out_of_line_type_names_constructor) 2760 << Next.getIdentifierInfo(); 2761 } 2762 2763 ParsedType TypeRep = Actions.getTypeName(*Next.getIdentifierInfo(), 2764 Next.getLocation(), 2765 getCurScope(), &SS, 2766 false, false, ParsedType(), 2767 /*IsCtorOrDtorName=*/false, 2768 /*NonTrivialSourceInfo=*/true); 2769 2770 // If the referenced identifier is not a type, then this declspec is 2771 // erroneous: We already checked about that it has no type specifier, and 2772 // C++ doesn't have implicit int. Diagnose it as a typo w.r.t. to the 2773 // typename. 2774 if (!TypeRep) { 2775 ConsumeToken(); // Eat the scope spec so the identifier is current. 2776 ParsedAttributesWithRange Attrs(AttrFactory); 2777 if (ParseImplicitInt(DS, &SS, TemplateInfo, AS, DSContext, Attrs)) { 2778 if (!Attrs.empty()) { 2779 AttrsLastTime = true; 2780 attrs.takeAllFrom(Attrs); 2781 } 2782 continue; 2783 } 2784 goto DoneWithDeclSpec; 2785 } 2786 2787 DS.getTypeSpecScope() = SS; 2788 ConsumeToken(); // The C++ scope. 2789 2790 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, 2791 DiagID, TypeRep, Policy); 2792 if (isInvalid) 2793 break; 2794 2795 DS.SetRangeEnd(Tok.getLocation()); 2796 ConsumeToken(); // The typename. 2797 2798 continue; 2799 } 2800 2801 case tok::annot_typename: { 2802 // If we've previously seen a tag definition, we were almost surely 2803 // missing a semicolon after it. 2804 if (DS.hasTypeSpecifier() && DS.hasTagDefinition()) 2805 goto DoneWithDeclSpec; 2806 2807 if (Tok.getAnnotationValue()) { 2808 ParsedType T = getTypeAnnotation(Tok); 2809 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, 2810 DiagID, T, Policy); 2811 } else 2812 DS.SetTypeSpecError(); 2813 2814 if (isInvalid) 2815 break; 2816 2817 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 2818 ConsumeToken(); // The typename 2819 2820 // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id' 2821 // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an 2822 // Objective-C interface. 2823 if (Tok.is(tok::less) && getLangOpts().ObjC1) 2824 ParseObjCProtocolQualifiers(DS); 2825 2826 continue; 2827 } 2828 2829 case tok::kw___is_signed: 2830 // GNU libstdc++ 4.4 uses __is_signed as an identifier, but Clang 2831 // typically treats it as a trait. If we see __is_signed as it appears 2832 // in libstdc++, e.g., 2833 // 2834 // static const bool __is_signed; 2835 // 2836 // then treat __is_signed as an identifier rather than as a keyword. 2837 if (DS.getTypeSpecType() == TST_bool && 2838 DS.getTypeQualifiers() == DeclSpec::TQ_const && 2839 DS.getStorageClassSpec() == DeclSpec::SCS_static) 2840 TryKeywordIdentFallback(true); 2841 2842 // We're done with the declaration-specifiers. 2843 goto DoneWithDeclSpec; 2844 2845 // typedef-name 2846 case tok::kw___super: 2847 case tok::kw_decltype: 2848 case tok::identifier: { 2849 // This identifier can only be a typedef name if we haven't already seen 2850 // a type-specifier. Without this check we misparse: 2851 // typedef int X; struct Y { short X; }; as 'short int'. 2852 if (DS.hasTypeSpecifier()) 2853 goto DoneWithDeclSpec; 2854 2855 // In C++, check to see if this is a scope specifier like foo::bar::, if 2856 // so handle it as such. This is important for ctor parsing. 2857 if (getLangOpts().CPlusPlus) { 2858 if (TryAnnotateCXXScopeToken(EnteringContext)) { 2859 DS.SetTypeSpecError(); 2860 goto DoneWithDeclSpec; 2861 } 2862 if (!Tok.is(tok::identifier)) 2863 continue; 2864 } 2865 2866 // Check for need to substitute AltiVec keyword tokens. 2867 if (TryAltiVecToken(DS, Loc, PrevSpec, DiagID, isInvalid)) 2868 break; 2869 2870 // [AltiVec] 2.2: [If the 'vector' specifier is used] The syntax does not 2871 // allow the use of a typedef name as a type specifier. 2872 if (DS.isTypeAltiVecVector()) 2873 goto DoneWithDeclSpec; 2874 2875 ParsedType TypeRep = 2876 Actions.getTypeName(*Tok.getIdentifierInfo(), 2877 Tok.getLocation(), getCurScope()); 2878 2879 // MSVC: If we weren't able to parse a default template argument, and it's 2880 // just a simple identifier, create a DependentNameType. This will allow 2881 // us to defer the name lookup to template instantiation time, as long we 2882 // forge a NestedNameSpecifier for the current context. 2883 if (!TypeRep && DSContext == DSC_template_type_arg && 2884 getLangOpts().MSVCCompat && getCurScope()->isTemplateParamScope()) { 2885 TypeRep = Actions.ActOnDelayedDefaultTemplateArg( 2886 *Tok.getIdentifierInfo(), Tok.getLocation()); 2887 } 2888 2889 // If this is not a typedef name, don't parse it as part of the declspec, 2890 // it must be an implicit int or an error. 2891 if (!TypeRep) { 2892 ParsedAttributesWithRange Attrs(AttrFactory); 2893 if (ParseImplicitInt(DS, nullptr, TemplateInfo, AS, DSContext, Attrs)) { 2894 if (!Attrs.empty()) { 2895 AttrsLastTime = true; 2896 attrs.takeAllFrom(Attrs); 2897 } 2898 continue; 2899 } 2900 goto DoneWithDeclSpec; 2901 } 2902 2903 // If we're in a context where the identifier could be a class name, 2904 // check whether this is a constructor declaration. 2905 if (getLangOpts().CPlusPlus && DSContext == DSC_class && 2906 Actions.isCurrentClassName(*Tok.getIdentifierInfo(), getCurScope()) && 2907 isConstructorDeclarator(/*Unqualified*/true)) 2908 goto DoneWithDeclSpec; 2909 2910 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, 2911 DiagID, TypeRep, Policy); 2912 if (isInvalid) 2913 break; 2914 2915 DS.SetRangeEnd(Tok.getLocation()); 2916 ConsumeToken(); // The identifier 2917 2918 // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id' 2919 // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an 2920 // Objective-C interface. 2921 if (Tok.is(tok::less) && getLangOpts().ObjC1) 2922 ParseObjCProtocolQualifiers(DS); 2923 2924 // Need to support trailing type qualifiers (e.g. "id<p> const"). 2925 // If a type specifier follows, it will be diagnosed elsewhere. 2926 continue; 2927 } 2928 2929 // type-name 2930 case tok::annot_template_id: { 2931 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2932 if (TemplateId->Kind != TNK_Type_template) { 2933 // This template-id does not refer to a type name, so we're 2934 // done with the type-specifiers. 2935 goto DoneWithDeclSpec; 2936 } 2937 2938 // If we're in a context where the template-id could be a 2939 // constructor name or specialization, check whether this is a 2940 // constructor declaration. 2941 if (getLangOpts().CPlusPlus && DSContext == DSC_class && 2942 Actions.isCurrentClassName(*TemplateId->Name, getCurScope()) && 2943 isConstructorDeclarator(TemplateId->SS.isEmpty())) 2944 goto DoneWithDeclSpec; 2945 2946 // Turn the template-id annotation token into a type annotation 2947 // token, then try again to parse it as a type-specifier. 2948 AnnotateTemplateIdTokenAsType(); 2949 continue; 2950 } 2951 2952 // GNU attributes support. 2953 case tok::kw___attribute: 2954 ParseGNUAttributes(DS.getAttributes(), nullptr, LateAttrs); 2955 continue; 2956 2957 // Microsoft declspec support. 2958 case tok::kw___declspec: 2959 ParseMicrosoftDeclSpec(DS.getAttributes()); 2960 continue; 2961 2962 // Microsoft single token adornments. 2963 case tok::kw___forceinline: { 2964 isInvalid = DS.setFunctionSpecForceInline(Loc, PrevSpec, DiagID); 2965 IdentifierInfo *AttrName = Tok.getIdentifierInfo(); 2966 SourceLocation AttrNameLoc = Tok.getLocation(); 2967 DS.getAttributes().addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, 2968 nullptr, 0, AttributeList::AS_Keyword); 2969 break; 2970 } 2971 2972 case tok::kw___sptr: 2973 case tok::kw___uptr: 2974 case tok::kw___ptr64: 2975 case tok::kw___ptr32: 2976 case tok::kw___w64: 2977 case tok::kw___cdecl: 2978 case tok::kw___stdcall: 2979 case tok::kw___fastcall: 2980 case tok::kw___thiscall: 2981 case tok::kw___vectorcall: 2982 case tok::kw___unaligned: 2983 ParseMicrosoftTypeAttributes(DS.getAttributes()); 2984 continue; 2985 2986 // Borland single token adornments. 2987 case tok::kw___pascal: 2988 ParseBorlandTypeAttributes(DS.getAttributes()); 2989 continue; 2990 2991 // OpenCL single token adornments. 2992 case tok::kw___kernel: 2993 ParseOpenCLAttributes(DS.getAttributes()); 2994 continue; 2995 2996 // storage-class-specifier 2997 case tok::kw_typedef: 2998 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_typedef, Loc, 2999 PrevSpec, DiagID, Policy); 3000 isStorageClass = true; 3001 break; 3002 case tok::kw_extern: 3003 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread) 3004 Diag(Tok, diag::ext_thread_before) << "extern"; 3005 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_extern, Loc, 3006 PrevSpec, DiagID, Policy); 3007 isStorageClass = true; 3008 break; 3009 case tok::kw___private_extern__: 3010 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_private_extern, 3011 Loc, PrevSpec, DiagID, Policy); 3012 isStorageClass = true; 3013 break; 3014 case tok::kw_static: 3015 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread) 3016 Diag(Tok, diag::ext_thread_before) << "static"; 3017 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_static, Loc, 3018 PrevSpec, DiagID, Policy); 3019 isStorageClass = true; 3020 break; 3021 case tok::kw_auto: 3022 if (getLangOpts().CPlusPlus11) { 3023 if (isKnownToBeTypeSpecifier(GetLookAheadToken(1))) { 3024 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_auto, Loc, 3025 PrevSpec, DiagID, Policy); 3026 if (!isInvalid) 3027 Diag(Tok, diag::ext_auto_storage_class) 3028 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 3029 } else 3030 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_auto, Loc, PrevSpec, 3031 DiagID, Policy); 3032 } else 3033 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_auto, Loc, 3034 PrevSpec, DiagID, Policy); 3035 isStorageClass = true; 3036 break; 3037 case tok::kw_register: 3038 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_register, Loc, 3039 PrevSpec, DiagID, Policy); 3040 isStorageClass = true; 3041 break; 3042 case tok::kw_mutable: 3043 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_mutable, Loc, 3044 PrevSpec, DiagID, Policy); 3045 isStorageClass = true; 3046 break; 3047 case tok::kw___thread: 3048 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS___thread, Loc, 3049 PrevSpec, DiagID); 3050 isStorageClass = true; 3051 break; 3052 case tok::kw_thread_local: 3053 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS_thread_local, Loc, 3054 PrevSpec, DiagID); 3055 break; 3056 case tok::kw__Thread_local: 3057 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS__Thread_local, 3058 Loc, PrevSpec, DiagID); 3059 isStorageClass = true; 3060 break; 3061 3062 // function-specifier 3063 case tok::kw_inline: 3064 isInvalid = DS.setFunctionSpecInline(Loc, PrevSpec, DiagID); 3065 break; 3066 case tok::kw_virtual: 3067 isInvalid = DS.setFunctionSpecVirtual(Loc, PrevSpec, DiagID); 3068 break; 3069 case tok::kw_explicit: 3070 isInvalid = DS.setFunctionSpecExplicit(Loc, PrevSpec, DiagID); 3071 break; 3072 case tok::kw__Noreturn: 3073 if (!getLangOpts().C11) 3074 Diag(Loc, diag::ext_c11_noreturn); 3075 isInvalid = DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID); 3076 break; 3077 3078 // alignment-specifier 3079 case tok::kw__Alignas: 3080 if (!getLangOpts().C11) 3081 Diag(Tok, diag::ext_c11_alignment) << Tok.getName(); 3082 ParseAlignmentSpecifier(DS.getAttributes()); 3083 continue; 3084 3085 // friend 3086 case tok::kw_friend: 3087 if (DSContext == DSC_class) 3088 isInvalid = DS.SetFriendSpec(Loc, PrevSpec, DiagID); 3089 else { 3090 PrevSpec = ""; // not actually used by the diagnostic 3091 DiagID = diag::err_friend_invalid_in_context; 3092 isInvalid = true; 3093 } 3094 break; 3095 3096 // Modules 3097 case tok::kw___module_private__: 3098 isInvalid = DS.setModulePrivateSpec(Loc, PrevSpec, DiagID); 3099 break; 3100 3101 // constexpr 3102 case tok::kw_constexpr: 3103 isInvalid = DS.SetConstexprSpec(Loc, PrevSpec, DiagID); 3104 break; 3105 3106 // type-specifier 3107 case tok::kw_short: 3108 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, 3109 DiagID, Policy); 3110 break; 3111 case tok::kw_long: 3112 if (DS.getTypeSpecWidth() != DeclSpec::TSW_long) 3113 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, 3114 DiagID, Policy); 3115 else 3116 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, 3117 DiagID, Policy); 3118 break; 3119 case tok::kw___int64: 3120 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, 3121 DiagID, Policy); 3122 break; 3123 case tok::kw_signed: 3124 isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, 3125 DiagID); 3126 break; 3127 case tok::kw_unsigned: 3128 isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, 3129 DiagID); 3130 break; 3131 case tok::kw__Complex: 3132 isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec, 3133 DiagID); 3134 break; 3135 case tok::kw__Imaginary: 3136 isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec, 3137 DiagID); 3138 break; 3139 case tok::kw_void: 3140 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, 3141 DiagID, Policy); 3142 break; 3143 case tok::kw_char: 3144 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, 3145 DiagID, Policy); 3146 break; 3147 case tok::kw_int: 3148 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, 3149 DiagID, Policy); 3150 break; 3151 case tok::kw___int128: 3152 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec, 3153 DiagID, Policy); 3154 break; 3155 case tok::kw_half: 3156 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec, 3157 DiagID, Policy); 3158 break; 3159 case tok::kw_float: 3160 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, 3161 DiagID, Policy); 3162 break; 3163 case tok::kw_double: 3164 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, 3165 DiagID, Policy); 3166 break; 3167 case tok::kw_wchar_t: 3168 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, 3169 DiagID, Policy); 3170 break; 3171 case tok::kw_char16_t: 3172 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, 3173 DiagID, Policy); 3174 break; 3175 case tok::kw_char32_t: 3176 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, 3177 DiagID, Policy); 3178 break; 3179 case tok::kw_bool: 3180 case tok::kw__Bool: 3181 if (Tok.is(tok::kw_bool) && 3182 DS.getTypeSpecType() != DeclSpec::TST_unspecified && 3183 DS.getStorageClassSpec() == DeclSpec::SCS_typedef) { 3184 PrevSpec = ""; // Not used by the diagnostic. 3185 DiagID = diag::err_bool_redeclaration; 3186 // For better error recovery. 3187 Tok.setKind(tok::identifier); 3188 isInvalid = true; 3189 } else { 3190 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, 3191 DiagID, Policy); 3192 } 3193 break; 3194 case tok::kw__Decimal32: 3195 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec, 3196 DiagID, Policy); 3197 break; 3198 case tok::kw__Decimal64: 3199 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec, 3200 DiagID, Policy); 3201 break; 3202 case tok::kw__Decimal128: 3203 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec, 3204 DiagID, Policy); 3205 break; 3206 case tok::kw___vector: 3207 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID, Policy); 3208 break; 3209 case tok::kw___pixel: 3210 isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID, Policy); 3211 break; 3212 case tok::kw___bool: 3213 isInvalid = DS.SetTypeAltiVecBool(true, Loc, PrevSpec, DiagID, Policy); 3214 break; 3215 case tok::kw___unknown_anytype: 3216 isInvalid = DS.SetTypeSpecType(TST_unknown_anytype, Loc, 3217 PrevSpec, DiagID, Policy); 3218 break; 3219 3220 // class-specifier: 3221 case tok::kw_class: 3222 case tok::kw_struct: 3223 case tok::kw___interface: 3224 case tok::kw_union: { 3225 tok::TokenKind Kind = Tok.getKind(); 3226 ConsumeToken(); 3227 3228 // These are attributes following class specifiers. 3229 // To produce better diagnostic, we parse them when 3230 // parsing class specifier. 3231 ParsedAttributesWithRange Attributes(AttrFactory); 3232 ParseClassSpecifier(Kind, Loc, DS, TemplateInfo, AS, 3233 EnteringContext, DSContext, Attributes); 3234 3235 // If there are attributes following class specifier, 3236 // take them over and handle them here. 3237 if (!Attributes.empty()) { 3238 AttrsLastTime = true; 3239 attrs.takeAllFrom(Attributes); 3240 } 3241 continue; 3242 } 3243 3244 // enum-specifier: 3245 case tok::kw_enum: 3246 ConsumeToken(); 3247 ParseEnumSpecifier(Loc, DS, TemplateInfo, AS, DSContext); 3248 continue; 3249 3250 // cv-qualifier: 3251 case tok::kw_const: 3252 isInvalid = DS.SetTypeQual(DeclSpec::TQ_const, Loc, PrevSpec, DiagID, 3253 getLangOpts()); 3254 break; 3255 case tok::kw_volatile: 3256 isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID, 3257 getLangOpts()); 3258 break; 3259 case tok::kw_restrict: 3260 isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID, 3261 getLangOpts()); 3262 break; 3263 3264 // C++ typename-specifier: 3265 case tok::kw_typename: 3266 if (TryAnnotateTypeOrScopeToken()) { 3267 DS.SetTypeSpecError(); 3268 goto DoneWithDeclSpec; 3269 } 3270 if (!Tok.is(tok::kw_typename)) 3271 continue; 3272 break; 3273 3274 // GNU typeof support. 3275 case tok::kw_typeof: 3276 ParseTypeofSpecifier(DS); 3277 continue; 3278 3279 case tok::annot_decltype: 3280 ParseDecltypeSpecifier(DS); 3281 continue; 3282 3283 case tok::kw___underlying_type: 3284 ParseUnderlyingTypeSpecifier(DS); 3285 continue; 3286 3287 case tok::kw__Atomic: 3288 // C11 6.7.2.4/4: 3289 // If the _Atomic keyword is immediately followed by a left parenthesis, 3290 // it is interpreted as a type specifier (with a type name), not as a 3291 // type qualifier. 3292 if (NextToken().is(tok::l_paren)) { 3293 ParseAtomicSpecifier(DS); 3294 continue; 3295 } 3296 isInvalid = DS.SetTypeQual(DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID, 3297 getLangOpts()); 3298 break; 3299 3300 // OpenCL qualifiers: 3301 case tok::kw___generic: 3302 // generic address space is introduced only in OpenCL v2.0 3303 // see OpenCL C Spec v2.0 s6.5.5 3304 if (Actions.getLangOpts().OpenCLVersion < 200) { 3305 DiagID = diag::err_opencl_unknown_type_specifier; 3306 PrevSpec = Tok.getIdentifierInfo()->getNameStart(); 3307 isInvalid = true; 3308 break; 3309 }; 3310 case tok::kw___private: 3311 case tok::kw___global: 3312 case tok::kw___local: 3313 case tok::kw___constant: 3314 case tok::kw___read_only: 3315 case tok::kw___write_only: 3316 case tok::kw___read_write: 3317 ParseOpenCLQualifiers(DS.getAttributes()); 3318 break; 3319 3320 case tok::less: 3321 // GCC ObjC supports types like "<SomeProtocol>" as a synonym for 3322 // "id<SomeProtocol>". This is hopelessly old fashioned and dangerous, 3323 // but we support it. 3324 if (DS.hasTypeSpecifier() || !getLangOpts().ObjC1) 3325 goto DoneWithDeclSpec; 3326 3327 if (!ParseObjCProtocolQualifiers(DS)) 3328 Diag(Loc, diag::warn_objc_protocol_qualifier_missing_id) 3329 << FixItHint::CreateInsertion(Loc, "id") 3330 << SourceRange(Loc, DS.getSourceRange().getEnd()); 3331 3332 // Need to support trailing type qualifiers (e.g. "id<p> const"). 3333 // If a type specifier follows, it will be diagnosed elsewhere. 3334 continue; 3335 } 3336 // If the specifier wasn't legal, issue a diagnostic. 3337 if (isInvalid) { 3338 assert(PrevSpec && "Method did not return previous specifier!"); 3339 assert(DiagID); 3340 3341 if (DiagID == diag::ext_duplicate_declspec) 3342 Diag(Tok, DiagID) 3343 << PrevSpec << FixItHint::CreateRemoval(Tok.getLocation()); 3344 else if (DiagID == diag::err_opencl_unknown_type_specifier) 3345 Diag(Tok, DiagID) << PrevSpec << isStorageClass; 3346 else 3347 Diag(Tok, DiagID) << PrevSpec; 3348 } 3349 3350 DS.SetRangeEnd(Tok.getLocation()); 3351 if (DiagID != diag::err_bool_redeclaration) 3352 ConsumeToken(); 3353 3354 AttrsLastTime = false; 3355 } 3356 } 3357 3358 /// ParseStructDeclaration - Parse a struct declaration without the terminating 3359 /// semicolon. 3360 /// 3361 /// struct-declaration: 3362 /// specifier-qualifier-list struct-declarator-list 3363 /// [GNU] __extension__ struct-declaration 3364 /// [GNU] specifier-qualifier-list 3365 /// struct-declarator-list: 3366 /// struct-declarator 3367 /// struct-declarator-list ',' struct-declarator 3368 /// [GNU] struct-declarator-list ',' attributes[opt] struct-declarator 3369 /// struct-declarator: 3370 /// declarator 3371 /// [GNU] declarator attributes[opt] 3372 /// declarator[opt] ':' constant-expression 3373 /// [GNU] declarator[opt] ':' constant-expression attributes[opt] 3374 /// 3375 void Parser::ParseStructDeclaration( 3376 ParsingDeclSpec &DS, 3377 llvm::function_ref<void(ParsingFieldDeclarator &)> FieldsCallback) { 3378 3379 if (Tok.is(tok::kw___extension__)) { 3380 // __extension__ silences extension warnings in the subexpression. 3381 ExtensionRAIIObject O(Diags); // Use RAII to do this. 3382 ConsumeToken(); 3383 return ParseStructDeclaration(DS, FieldsCallback); 3384 } 3385 3386 // Parse the common specifier-qualifiers-list piece. 3387 ParseSpecifierQualifierList(DS); 3388 3389 // If there are no declarators, this is a free-standing declaration 3390 // specifier. Let the actions module cope with it. 3391 if (Tok.is(tok::semi)) { 3392 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none, 3393 DS); 3394 DS.complete(TheDecl); 3395 return; 3396 } 3397 3398 // Read struct-declarators until we find the semicolon. 3399 bool FirstDeclarator = true; 3400 SourceLocation CommaLoc; 3401 while (1) { 3402 ParsingFieldDeclarator DeclaratorInfo(*this, DS); 3403 DeclaratorInfo.D.setCommaLoc(CommaLoc); 3404 3405 // Attributes are only allowed here on successive declarators. 3406 if (!FirstDeclarator) 3407 MaybeParseGNUAttributes(DeclaratorInfo.D); 3408 3409 /// struct-declarator: declarator 3410 /// struct-declarator: declarator[opt] ':' constant-expression 3411 if (Tok.isNot(tok::colon)) { 3412 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 3413 ColonProtectionRAIIObject X(*this); 3414 ParseDeclarator(DeclaratorInfo.D); 3415 } else 3416 DeclaratorInfo.D.SetIdentifier(nullptr, Tok.getLocation()); 3417 3418 if (TryConsumeToken(tok::colon)) { 3419 ExprResult Res(ParseConstantExpression()); 3420 if (Res.isInvalid()) 3421 SkipUntil(tok::semi, StopBeforeMatch); 3422 else 3423 DeclaratorInfo.BitfieldSize = Res.get(); 3424 } 3425 3426 // If attributes exist after the declarator, parse them. 3427 MaybeParseGNUAttributes(DeclaratorInfo.D); 3428 3429 // We're done with this declarator; invoke the callback. 3430 FieldsCallback(DeclaratorInfo); 3431 3432 // If we don't have a comma, it is either the end of the list (a ';') 3433 // or an error, bail out. 3434 if (!TryConsumeToken(tok::comma, CommaLoc)) 3435 return; 3436 3437 FirstDeclarator = false; 3438 } 3439 } 3440 3441 /// ParseStructUnionBody 3442 /// struct-contents: 3443 /// struct-declaration-list 3444 /// [EXT] empty 3445 /// [GNU] "struct-declaration-list" without terminatoring ';' 3446 /// struct-declaration-list: 3447 /// struct-declaration 3448 /// struct-declaration-list struct-declaration 3449 /// [OBC] '@' 'defs' '(' class-name ')' 3450 /// 3451 void Parser::ParseStructUnionBody(SourceLocation RecordLoc, 3452 unsigned TagType, Decl *TagDecl) { 3453 PrettyDeclStackTraceEntry CrashInfo(Actions, TagDecl, RecordLoc, 3454 "parsing struct/union body"); 3455 assert(!getLangOpts().CPlusPlus && "C++ declarations not supported"); 3456 3457 BalancedDelimiterTracker T(*this, tok::l_brace); 3458 if (T.consumeOpen()) 3459 return; 3460 3461 ParseScope StructScope(this, Scope::ClassScope|Scope::DeclScope); 3462 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl); 3463 3464 SmallVector<Decl *, 32> FieldDecls; 3465 3466 // While we still have something to read, read the declarations in the struct. 3467 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) { 3468 // Each iteration of this loop reads one struct-declaration. 3469 3470 // Check for extraneous top-level semicolon. 3471 if (Tok.is(tok::semi)) { 3472 ConsumeExtraSemi(InsideStruct, TagType); 3473 continue; 3474 } 3475 3476 // Parse _Static_assert declaration. 3477 if (Tok.is(tok::kw__Static_assert)) { 3478 SourceLocation DeclEnd; 3479 ParseStaticAssertDeclaration(DeclEnd); 3480 continue; 3481 } 3482 3483 if (Tok.is(tok::annot_pragma_pack)) { 3484 HandlePragmaPack(); 3485 continue; 3486 } 3487 3488 if (Tok.is(tok::annot_pragma_align)) { 3489 HandlePragmaAlign(); 3490 continue; 3491 } 3492 3493 if (!Tok.is(tok::at)) { 3494 auto CFieldCallback = [&](ParsingFieldDeclarator &FD) { 3495 // Install the declarator into the current TagDecl. 3496 Decl *Field = 3497 Actions.ActOnField(getCurScope(), TagDecl, 3498 FD.D.getDeclSpec().getSourceRange().getBegin(), 3499 FD.D, FD.BitfieldSize); 3500 FieldDecls.push_back(Field); 3501 FD.complete(Field); 3502 }; 3503 3504 // Parse all the comma separated declarators. 3505 ParsingDeclSpec DS(*this); 3506 ParseStructDeclaration(DS, CFieldCallback); 3507 } else { // Handle @defs 3508 ConsumeToken(); 3509 if (!Tok.isObjCAtKeyword(tok::objc_defs)) { 3510 Diag(Tok, diag::err_unexpected_at); 3511 SkipUntil(tok::semi); 3512 continue; 3513 } 3514 ConsumeToken(); 3515 ExpectAndConsume(tok::l_paren); 3516 if (!Tok.is(tok::identifier)) { 3517 Diag(Tok, diag::err_expected) << tok::identifier; 3518 SkipUntil(tok::semi); 3519 continue; 3520 } 3521 SmallVector<Decl *, 16> Fields; 3522 Actions.ActOnDefs(getCurScope(), TagDecl, Tok.getLocation(), 3523 Tok.getIdentifierInfo(), Fields); 3524 FieldDecls.insert(FieldDecls.end(), Fields.begin(), Fields.end()); 3525 ConsumeToken(); 3526 ExpectAndConsume(tok::r_paren); 3527 } 3528 3529 if (TryConsumeToken(tok::semi)) 3530 continue; 3531 3532 if (Tok.is(tok::r_brace)) { 3533 ExpectAndConsume(tok::semi, diag::ext_expected_semi_decl_list); 3534 break; 3535 } 3536 3537 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list); 3538 // Skip to end of block or statement to avoid ext-warning on extra ';'. 3539 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch); 3540 // If we stopped at a ';', eat it. 3541 TryConsumeToken(tok::semi); 3542 } 3543 3544 T.consumeClose(); 3545 3546 ParsedAttributes attrs(AttrFactory); 3547 // If attributes exist after struct contents, parse them. 3548 MaybeParseGNUAttributes(attrs); 3549 3550 Actions.ActOnFields(getCurScope(), 3551 RecordLoc, TagDecl, FieldDecls, 3552 T.getOpenLocation(), T.getCloseLocation(), 3553 attrs.getList()); 3554 StructScope.Exit(); 3555 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, 3556 T.getCloseLocation()); 3557 } 3558 3559 /// ParseEnumSpecifier 3560 /// enum-specifier: [C99 6.7.2.2] 3561 /// 'enum' identifier[opt] '{' enumerator-list '}' 3562 ///[C99/C++]'enum' identifier[opt] '{' enumerator-list ',' '}' 3563 /// [GNU] 'enum' attributes[opt] identifier[opt] '{' enumerator-list ',' [opt] 3564 /// '}' attributes[opt] 3565 /// [MS] 'enum' __declspec[opt] identifier[opt] '{' enumerator-list ',' [opt] 3566 /// '}' 3567 /// 'enum' identifier 3568 /// [GNU] 'enum' attributes[opt] identifier 3569 /// 3570 /// [C++11] enum-head '{' enumerator-list[opt] '}' 3571 /// [C++11] enum-head '{' enumerator-list ',' '}' 3572 /// 3573 /// enum-head: [C++11] 3574 /// enum-key attribute-specifier-seq[opt] identifier[opt] enum-base[opt] 3575 /// enum-key attribute-specifier-seq[opt] nested-name-specifier 3576 /// identifier enum-base[opt] 3577 /// 3578 /// enum-key: [C++11] 3579 /// 'enum' 3580 /// 'enum' 'class' 3581 /// 'enum' 'struct' 3582 /// 3583 /// enum-base: [C++11] 3584 /// ':' type-specifier-seq 3585 /// 3586 /// [C++] elaborated-type-specifier: 3587 /// [C++] 'enum' '::'[opt] nested-name-specifier[opt] identifier 3588 /// 3589 void Parser::ParseEnumSpecifier(SourceLocation StartLoc, DeclSpec &DS, 3590 const ParsedTemplateInfo &TemplateInfo, 3591 AccessSpecifier AS, DeclSpecContext DSC) { 3592 // Parse the tag portion of this. 3593 if (Tok.is(tok::code_completion)) { 3594 // Code completion for an enum name. 3595 Actions.CodeCompleteTag(getCurScope(), DeclSpec::TST_enum); 3596 return cutOffParsing(); 3597 } 3598 3599 // If attributes exist after tag, parse them. 3600 ParsedAttributesWithRange attrs(AttrFactory); 3601 MaybeParseGNUAttributes(attrs); 3602 MaybeParseCXX11Attributes(attrs); 3603 3604 // If declspecs exist after tag, parse them. 3605 while (Tok.is(tok::kw___declspec)) 3606 ParseMicrosoftDeclSpec(attrs); 3607 3608 SourceLocation ScopedEnumKWLoc; 3609 bool IsScopedUsingClassTag = false; 3610 3611 // In C++11, recognize 'enum class' and 'enum struct'. 3612 if (Tok.is(tok::kw_class) || Tok.is(tok::kw_struct)) { 3613 Diag(Tok, getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_scoped_enum 3614 : diag::ext_scoped_enum); 3615 IsScopedUsingClassTag = Tok.is(tok::kw_class); 3616 ScopedEnumKWLoc = ConsumeToken(); 3617 3618 // Attributes are not allowed between these keywords. Diagnose, 3619 // but then just treat them like they appeared in the right place. 3620 ProhibitAttributes(attrs); 3621 3622 // They are allowed afterwards, though. 3623 MaybeParseGNUAttributes(attrs); 3624 MaybeParseCXX11Attributes(attrs); 3625 while (Tok.is(tok::kw___declspec)) 3626 ParseMicrosoftDeclSpec(attrs); 3627 } 3628 3629 // C++11 [temp.explicit]p12: 3630 // The usual access controls do not apply to names used to specify 3631 // explicit instantiations. 3632 // We extend this to also cover explicit specializations. Note that 3633 // we don't suppress if this turns out to be an elaborated type 3634 // specifier. 3635 bool shouldDelayDiagsInTag = 3636 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation || 3637 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization); 3638 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag); 3639 3640 // Enum definitions should not be parsed in a trailing-return-type. 3641 bool AllowDeclaration = DSC != DSC_trailing; 3642 3643 bool AllowFixedUnderlyingType = AllowDeclaration && 3644 (getLangOpts().CPlusPlus11 || getLangOpts().MicrosoftExt || 3645 getLangOpts().ObjC2); 3646 3647 CXXScopeSpec &SS = DS.getTypeSpecScope(); 3648 if (getLangOpts().CPlusPlus) { 3649 // "enum foo : bar;" is not a potential typo for "enum foo::bar;" 3650 // if a fixed underlying type is allowed. 3651 ColonProtectionRAIIObject X(*this, AllowFixedUnderlyingType); 3652 3653 CXXScopeSpec Spec; 3654 if (ParseOptionalCXXScopeSpecifier(Spec, ParsedType(), 3655 /*EnteringContext=*/true)) 3656 return; 3657 3658 if (Spec.isSet() && Tok.isNot(tok::identifier)) { 3659 Diag(Tok, diag::err_expected) << tok::identifier; 3660 if (Tok.isNot(tok::l_brace)) { 3661 // Has no name and is not a definition. 3662 // Skip the rest of this declarator, up until the comma or semicolon. 3663 SkipUntil(tok::comma, StopAtSemi); 3664 return; 3665 } 3666 } 3667 3668 SS = Spec; 3669 } 3670 3671 // Must have either 'enum name' or 'enum {...}'. 3672 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::l_brace) && 3673 !(AllowFixedUnderlyingType && Tok.is(tok::colon))) { 3674 Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace; 3675 3676 // Skip the rest of this declarator, up until the comma or semicolon. 3677 SkipUntil(tok::comma, StopAtSemi); 3678 return; 3679 } 3680 3681 // If an identifier is present, consume and remember it. 3682 IdentifierInfo *Name = nullptr; 3683 SourceLocation NameLoc; 3684 if (Tok.is(tok::identifier)) { 3685 Name = Tok.getIdentifierInfo(); 3686 NameLoc = ConsumeToken(); 3687 } 3688 3689 if (!Name && ScopedEnumKWLoc.isValid()) { 3690 // C++0x 7.2p2: The optional identifier shall not be omitted in the 3691 // declaration of a scoped enumeration. 3692 Diag(Tok, diag::err_scoped_enum_missing_identifier); 3693 ScopedEnumKWLoc = SourceLocation(); 3694 IsScopedUsingClassTag = false; 3695 } 3696 3697 // Okay, end the suppression area. We'll decide whether to emit the 3698 // diagnostics in a second. 3699 if (shouldDelayDiagsInTag) 3700 diagsFromTag.done(); 3701 3702 TypeResult BaseType; 3703 3704 // Parse the fixed underlying type. 3705 bool CanBeBitfield = getCurScope()->getFlags() & Scope::ClassScope; 3706 if (AllowFixedUnderlyingType && Tok.is(tok::colon)) { 3707 bool PossibleBitfield = false; 3708 if (CanBeBitfield) { 3709 // If we're in class scope, this can either be an enum declaration with 3710 // an underlying type, or a declaration of a bitfield member. We try to 3711 // use a simple disambiguation scheme first to catch the common cases 3712 // (integer literal, sizeof); if it's still ambiguous, we then consider 3713 // anything that's a simple-type-specifier followed by '(' as an 3714 // expression. This suffices because function types are not valid 3715 // underlying types anyway. 3716 EnterExpressionEvaluationContext Unevaluated(Actions, 3717 Sema::ConstantEvaluated); 3718 TPResult TPR = isExpressionOrTypeSpecifierSimple(NextToken().getKind()); 3719 // If the next token starts an expression, we know we're parsing a 3720 // bit-field. This is the common case. 3721 if (TPR == TPResult::True) 3722 PossibleBitfield = true; 3723 // If the next token starts a type-specifier-seq, it may be either a 3724 // a fixed underlying type or the start of a function-style cast in C++; 3725 // lookahead one more token to see if it's obvious that we have a 3726 // fixed underlying type. 3727 else if (TPR == TPResult::False && 3728 GetLookAheadToken(2).getKind() == tok::semi) { 3729 // Consume the ':'. 3730 ConsumeToken(); 3731 } else { 3732 // We have the start of a type-specifier-seq, so we have to perform 3733 // tentative parsing to determine whether we have an expression or a 3734 // type. 3735 TentativeParsingAction TPA(*this); 3736 3737 // Consume the ':'. 3738 ConsumeToken(); 3739 3740 // If we see a type specifier followed by an open-brace, we have an 3741 // ambiguity between an underlying type and a C++11 braced 3742 // function-style cast. Resolve this by always treating it as an 3743 // underlying type. 3744 // FIXME: The standard is not entirely clear on how to disambiguate in 3745 // this case. 3746 if ((getLangOpts().CPlusPlus && 3747 isCXXDeclarationSpecifier(TPResult::True) != TPResult::True) || 3748 (!getLangOpts().CPlusPlus && !isDeclarationSpecifier(true))) { 3749 // We'll parse this as a bitfield later. 3750 PossibleBitfield = true; 3751 TPA.Revert(); 3752 } else { 3753 // We have a type-specifier-seq. 3754 TPA.Commit(); 3755 } 3756 } 3757 } else { 3758 // Consume the ':'. 3759 ConsumeToken(); 3760 } 3761 3762 if (!PossibleBitfield) { 3763 SourceRange Range; 3764 BaseType = ParseTypeName(&Range); 3765 3766 if (getLangOpts().CPlusPlus11) { 3767 Diag(StartLoc, diag::warn_cxx98_compat_enum_fixed_underlying_type); 3768 } else if (!getLangOpts().ObjC2) { 3769 if (getLangOpts().CPlusPlus) 3770 Diag(StartLoc, diag::ext_cxx11_enum_fixed_underlying_type) << Range; 3771 else 3772 Diag(StartLoc, diag::ext_c_enum_fixed_underlying_type) << Range; 3773 } 3774 } 3775 } 3776 3777 // There are four options here. If we have 'friend enum foo;' then this is a 3778 // friend declaration, and cannot have an accompanying definition. If we have 3779 // 'enum foo;', then this is a forward declaration. If we have 3780 // 'enum foo {...' then this is a definition. Otherwise we have something 3781 // like 'enum foo xyz', a reference. 3782 // 3783 // This is needed to handle stuff like this right (C99 6.7.2.3p11): 3784 // enum foo {..}; void bar() { enum foo; } <- new foo in bar. 3785 // enum foo {..}; void bar() { enum foo x; } <- use of old foo. 3786 // 3787 Sema::TagUseKind TUK; 3788 if (!AllowDeclaration) { 3789 TUK = Sema::TUK_Reference; 3790 } else if (Tok.is(tok::l_brace)) { 3791 if (DS.isFriendSpecified()) { 3792 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type) 3793 << SourceRange(DS.getFriendSpecLoc()); 3794 ConsumeBrace(); 3795 SkipUntil(tok::r_brace, StopAtSemi); 3796 TUK = Sema::TUK_Friend; 3797 } else { 3798 TUK = Sema::TUK_Definition; 3799 } 3800 } else if (!isTypeSpecifier(DSC) && 3801 (Tok.is(tok::semi) || 3802 (Tok.isAtStartOfLine() && 3803 !isValidAfterTypeSpecifier(CanBeBitfield)))) { 3804 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration; 3805 if (Tok.isNot(tok::semi)) { 3806 // A semicolon was missing after this declaration. Diagnose and recover. 3807 ExpectAndConsume(tok::semi, diag::err_expected_after, "enum"); 3808 PP.EnterToken(Tok); 3809 Tok.setKind(tok::semi); 3810 } 3811 } else { 3812 TUK = Sema::TUK_Reference; 3813 } 3814 3815 // If this is an elaborated type specifier, and we delayed 3816 // diagnostics before, just merge them into the current pool. 3817 if (TUK == Sema::TUK_Reference && shouldDelayDiagsInTag) { 3818 diagsFromTag.redelay(); 3819 } 3820 3821 MultiTemplateParamsArg TParams; 3822 if (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate && 3823 TUK != Sema::TUK_Reference) { 3824 if (!getLangOpts().CPlusPlus11 || !SS.isSet()) { 3825 // Skip the rest of this declarator, up until the comma or semicolon. 3826 Diag(Tok, diag::err_enum_template); 3827 SkipUntil(tok::comma, StopAtSemi); 3828 return; 3829 } 3830 3831 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) { 3832 // Enumerations can't be explicitly instantiated. 3833 DS.SetTypeSpecError(); 3834 Diag(StartLoc, diag::err_explicit_instantiation_enum); 3835 return; 3836 } 3837 3838 assert(TemplateInfo.TemplateParams && "no template parameters"); 3839 TParams = MultiTemplateParamsArg(TemplateInfo.TemplateParams->data(), 3840 TemplateInfo.TemplateParams->size()); 3841 } 3842 3843 if (TUK == Sema::TUK_Reference) 3844 ProhibitAttributes(attrs); 3845 3846 if (!Name && TUK != Sema::TUK_Definition) { 3847 Diag(Tok, diag::err_enumerator_unnamed_no_def); 3848 3849 // Skip the rest of this declarator, up until the comma or semicolon. 3850 SkipUntil(tok::comma, StopAtSemi); 3851 return; 3852 } 3853 3854 bool Owned = false; 3855 bool IsDependent = false; 3856 const char *PrevSpec = nullptr; 3857 unsigned DiagID; 3858 Decl *TagDecl = Actions.ActOnTag(getCurScope(), DeclSpec::TST_enum, TUK, 3859 StartLoc, SS, Name, NameLoc, attrs.getList(), 3860 AS, DS.getModulePrivateSpecLoc(), TParams, 3861 Owned, IsDependent, ScopedEnumKWLoc, 3862 IsScopedUsingClassTag, BaseType, 3863 DSC == DSC_type_specifier); 3864 3865 if (IsDependent) { 3866 // This enum has a dependent nested-name-specifier. Handle it as a 3867 // dependent tag. 3868 if (!Name) { 3869 DS.SetTypeSpecError(); 3870 Diag(Tok, diag::err_expected_type_name_after_typename); 3871 return; 3872 } 3873 3874 TypeResult Type = Actions.ActOnDependentTag( 3875 getCurScope(), DeclSpec::TST_enum, TUK, SS, Name, StartLoc, NameLoc); 3876 if (Type.isInvalid()) { 3877 DS.SetTypeSpecError(); 3878 return; 3879 } 3880 3881 if (DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, 3882 NameLoc.isValid() ? NameLoc : StartLoc, 3883 PrevSpec, DiagID, Type.get(), 3884 Actions.getASTContext().getPrintingPolicy())) 3885 Diag(StartLoc, DiagID) << PrevSpec; 3886 3887 return; 3888 } 3889 3890 if (!TagDecl) { 3891 // The action failed to produce an enumeration tag. If this is a 3892 // definition, consume the entire definition. 3893 if (Tok.is(tok::l_brace) && TUK != Sema::TUK_Reference) { 3894 ConsumeBrace(); 3895 SkipUntil(tok::r_brace, StopAtSemi); 3896 } 3897 3898 DS.SetTypeSpecError(); 3899 return; 3900 } 3901 3902 if (Tok.is(tok::l_brace) && TUK != Sema::TUK_Reference) 3903 ParseEnumBody(StartLoc, TagDecl); 3904 3905 if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc, 3906 NameLoc.isValid() ? NameLoc : StartLoc, 3907 PrevSpec, DiagID, TagDecl, Owned, 3908 Actions.getASTContext().getPrintingPolicy())) 3909 Diag(StartLoc, DiagID) << PrevSpec; 3910 } 3911 3912 /// ParseEnumBody - Parse a {} enclosed enumerator-list. 3913 /// enumerator-list: 3914 /// enumerator 3915 /// enumerator-list ',' enumerator 3916 /// enumerator: 3917 /// enumeration-constant attributes[opt] 3918 /// enumeration-constant attributes[opt] '=' constant-expression 3919 /// enumeration-constant: 3920 /// identifier 3921 /// 3922 void Parser::ParseEnumBody(SourceLocation StartLoc, Decl *EnumDecl) { 3923 // Enter the scope of the enum body and start the definition. 3924 ParseScope EnumScope(this, Scope::DeclScope | Scope::EnumScope); 3925 Actions.ActOnTagStartDefinition(getCurScope(), EnumDecl); 3926 3927 BalancedDelimiterTracker T(*this, tok::l_brace); 3928 T.consumeOpen(); 3929 3930 // C does not allow an empty enumerator-list, C++ does [dcl.enum]. 3931 if (Tok.is(tok::r_brace) && !getLangOpts().CPlusPlus) 3932 Diag(Tok, diag::error_empty_enum); 3933 3934 SmallVector<Decl *, 32> EnumConstantDecls; 3935 3936 Decl *LastEnumConstDecl = nullptr; 3937 3938 // Parse the enumerator-list. 3939 while (Tok.isNot(tok::r_brace)) { 3940 // Parse enumerator. If failed, try skipping till the start of the next 3941 // enumerator definition. 3942 if (Tok.isNot(tok::identifier)) { 3943 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier; 3944 if (SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch) && 3945 TryConsumeToken(tok::comma)) 3946 continue; 3947 break; 3948 } 3949 IdentifierInfo *Ident = Tok.getIdentifierInfo(); 3950 SourceLocation IdentLoc = ConsumeToken(); 3951 3952 // If attributes exist after the enumerator, parse them. 3953 ParsedAttributesWithRange attrs(AttrFactory); 3954 MaybeParseGNUAttributes(attrs); 3955 ProhibitAttributes(attrs); // GNU-style attributes are prohibited. 3956 if (getLangOpts().CPlusPlus11 && isCXX11AttributeSpecifier()) { 3957 if (!getLangOpts().CPlusPlus1z) 3958 Diag(Tok.getLocation(), diag::warn_cxx14_compat_attribute) 3959 << 1 /*enumerator*/; 3960 ParseCXX11Attributes(attrs); 3961 } 3962 3963 SourceLocation EqualLoc; 3964 ExprResult AssignedVal; 3965 ParsingDeclRAIIObject PD(*this, ParsingDeclRAIIObject::NoParent); 3966 3967 if (TryConsumeToken(tok::equal, EqualLoc)) { 3968 AssignedVal = ParseConstantExpression(); 3969 if (AssignedVal.isInvalid()) 3970 SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch); 3971 } 3972 3973 // Install the enumerator constant into EnumDecl. 3974 Decl *EnumConstDecl = Actions.ActOnEnumConstant(getCurScope(), EnumDecl, 3975 LastEnumConstDecl, 3976 IdentLoc, Ident, 3977 attrs.getList(), EqualLoc, 3978 AssignedVal.get()); 3979 PD.complete(EnumConstDecl); 3980 3981 EnumConstantDecls.push_back(EnumConstDecl); 3982 LastEnumConstDecl = EnumConstDecl; 3983 3984 if (Tok.is(tok::identifier)) { 3985 // We're missing a comma between enumerators. 3986 SourceLocation Loc = PP.getLocForEndOfToken(PrevTokLocation); 3987 Diag(Loc, diag::err_enumerator_list_missing_comma) 3988 << FixItHint::CreateInsertion(Loc, ", "); 3989 continue; 3990 } 3991 3992 // Emumerator definition must be finished, only comma or r_brace are 3993 // allowed here. 3994 SourceLocation CommaLoc; 3995 if (Tok.isNot(tok::r_brace) && !TryConsumeToken(tok::comma, CommaLoc)) { 3996 if (EqualLoc.isValid()) 3997 Diag(Tok.getLocation(), diag::err_expected_either) << tok::r_brace 3998 << tok::comma; 3999 else 4000 Diag(Tok.getLocation(), diag::err_expected_end_of_enumerator); 4001 if (SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch)) { 4002 if (TryConsumeToken(tok::comma, CommaLoc)) 4003 continue; 4004 } else { 4005 break; 4006 } 4007 } 4008 4009 // If comma is followed by r_brace, emit appropriate warning. 4010 if (Tok.is(tok::r_brace) && CommaLoc.isValid()) { 4011 if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11) 4012 Diag(CommaLoc, getLangOpts().CPlusPlus ? 4013 diag::ext_enumerator_list_comma_cxx : 4014 diag::ext_enumerator_list_comma_c) 4015 << FixItHint::CreateRemoval(CommaLoc); 4016 else if (getLangOpts().CPlusPlus11) 4017 Diag(CommaLoc, diag::warn_cxx98_compat_enumerator_list_comma) 4018 << FixItHint::CreateRemoval(CommaLoc); 4019 break; 4020 } 4021 } 4022 4023 // Eat the }. 4024 T.consumeClose(); 4025 4026 // If attributes exist after the identifier list, parse them. 4027 ParsedAttributes attrs(AttrFactory); 4028 MaybeParseGNUAttributes(attrs); 4029 4030 Actions.ActOnEnumBody(StartLoc, T.getOpenLocation(), T.getCloseLocation(), 4031 EnumDecl, EnumConstantDecls, 4032 getCurScope(), 4033 attrs.getList()); 4034 4035 EnumScope.Exit(); 4036 Actions.ActOnTagFinishDefinition(getCurScope(), EnumDecl, 4037 T.getCloseLocation()); 4038 4039 // The next token must be valid after an enum definition. If not, a ';' 4040 // was probably forgotten. 4041 bool CanBeBitfield = getCurScope()->getFlags() & Scope::ClassScope; 4042 if (!isValidAfterTypeSpecifier(CanBeBitfield)) { 4043 ExpectAndConsume(tok::semi, diag::err_expected_after, "enum"); 4044 // Push this token back into the preprocessor and change our current token 4045 // to ';' so that the rest of the code recovers as though there were an 4046 // ';' after the definition. 4047 PP.EnterToken(Tok); 4048 Tok.setKind(tok::semi); 4049 } 4050 } 4051 4052 /// isTypeSpecifierQualifier - Return true if the current token could be the 4053 /// start of a type-qualifier-list. 4054 bool Parser::isTypeQualifier() const { 4055 switch (Tok.getKind()) { 4056 default: return false; 4057 // type-qualifier 4058 case tok::kw_const: 4059 case tok::kw_volatile: 4060 case tok::kw_restrict: 4061 case tok::kw___private: 4062 case tok::kw___local: 4063 case tok::kw___global: 4064 case tok::kw___constant: 4065 case tok::kw___generic: 4066 case tok::kw___read_only: 4067 case tok::kw___read_write: 4068 case tok::kw___write_only: 4069 return true; 4070 } 4071 } 4072 4073 /// isKnownToBeTypeSpecifier - Return true if we know that the specified token 4074 /// is definitely a type-specifier. Return false if it isn't part of a type 4075 /// specifier or if we're not sure. 4076 bool Parser::isKnownToBeTypeSpecifier(const Token &Tok) const { 4077 switch (Tok.getKind()) { 4078 default: return false; 4079 // type-specifiers 4080 case tok::kw_short: 4081 case tok::kw_long: 4082 case tok::kw___int64: 4083 case tok::kw___int128: 4084 case tok::kw_signed: 4085 case tok::kw_unsigned: 4086 case tok::kw__Complex: 4087 case tok::kw__Imaginary: 4088 case tok::kw_void: 4089 case tok::kw_char: 4090 case tok::kw_wchar_t: 4091 case tok::kw_char16_t: 4092 case tok::kw_char32_t: 4093 case tok::kw_int: 4094 case tok::kw_half: 4095 case tok::kw_float: 4096 case tok::kw_double: 4097 case tok::kw_bool: 4098 case tok::kw__Bool: 4099 case tok::kw__Decimal32: 4100 case tok::kw__Decimal64: 4101 case tok::kw__Decimal128: 4102 case tok::kw___vector: 4103 4104 // struct-or-union-specifier (C99) or class-specifier (C++) 4105 case tok::kw_class: 4106 case tok::kw_struct: 4107 case tok::kw___interface: 4108 case tok::kw_union: 4109 // enum-specifier 4110 case tok::kw_enum: 4111 4112 // typedef-name 4113 case tok::annot_typename: 4114 return true; 4115 } 4116 } 4117 4118 /// isTypeSpecifierQualifier - Return true if the current token could be the 4119 /// start of a specifier-qualifier-list. 4120 bool Parser::isTypeSpecifierQualifier() { 4121 switch (Tok.getKind()) { 4122 default: return false; 4123 4124 case tok::identifier: // foo::bar 4125 if (TryAltiVecVectorToken()) 4126 return true; 4127 // Fall through. 4128 case tok::kw_typename: // typename T::type 4129 // Annotate typenames and C++ scope specifiers. If we get one, just 4130 // recurse to handle whatever we get. 4131 if (TryAnnotateTypeOrScopeToken()) 4132 return true; 4133 if (Tok.is(tok::identifier)) 4134 return false; 4135 return isTypeSpecifierQualifier(); 4136 4137 case tok::coloncolon: // ::foo::bar 4138 if (NextToken().is(tok::kw_new) || // ::new 4139 NextToken().is(tok::kw_delete)) // ::delete 4140 return false; 4141 4142 if (TryAnnotateTypeOrScopeToken()) 4143 return true; 4144 return isTypeSpecifierQualifier(); 4145 4146 // GNU attributes support. 4147 case tok::kw___attribute: 4148 // GNU typeof support. 4149 case tok::kw_typeof: 4150 4151 // type-specifiers 4152 case tok::kw_short: 4153 case tok::kw_long: 4154 case tok::kw___int64: 4155 case tok::kw___int128: 4156 case tok::kw_signed: 4157 case tok::kw_unsigned: 4158 case tok::kw__Complex: 4159 case tok::kw__Imaginary: 4160 case tok::kw_void: 4161 case tok::kw_char: 4162 case tok::kw_wchar_t: 4163 case tok::kw_char16_t: 4164 case tok::kw_char32_t: 4165 case tok::kw_int: 4166 case tok::kw_half: 4167 case tok::kw_float: 4168 case tok::kw_double: 4169 case tok::kw_bool: 4170 case tok::kw__Bool: 4171 case tok::kw__Decimal32: 4172 case tok::kw__Decimal64: 4173 case tok::kw__Decimal128: 4174 case tok::kw___vector: 4175 4176 // struct-or-union-specifier (C99) or class-specifier (C++) 4177 case tok::kw_class: 4178 case tok::kw_struct: 4179 case tok::kw___interface: 4180 case tok::kw_union: 4181 // enum-specifier 4182 case tok::kw_enum: 4183 4184 // type-qualifier 4185 case tok::kw_const: 4186 case tok::kw_volatile: 4187 case tok::kw_restrict: 4188 4189 // Debugger support. 4190 case tok::kw___unknown_anytype: 4191 4192 // typedef-name 4193 case tok::annot_typename: 4194 return true; 4195 4196 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'. 4197 case tok::less: 4198 return getLangOpts().ObjC1; 4199 4200 case tok::kw___cdecl: 4201 case tok::kw___stdcall: 4202 case tok::kw___fastcall: 4203 case tok::kw___thiscall: 4204 case tok::kw___vectorcall: 4205 case tok::kw___w64: 4206 case tok::kw___ptr64: 4207 case tok::kw___ptr32: 4208 case tok::kw___pascal: 4209 case tok::kw___unaligned: 4210 4211 case tok::kw___private: 4212 case tok::kw___local: 4213 case tok::kw___global: 4214 case tok::kw___constant: 4215 case tok::kw___generic: 4216 case tok::kw___read_only: 4217 case tok::kw___read_write: 4218 case tok::kw___write_only: 4219 4220 return true; 4221 4222 // C11 _Atomic 4223 case tok::kw__Atomic: 4224 return true; 4225 } 4226 } 4227 4228 /// isDeclarationSpecifier() - Return true if the current token is part of a 4229 /// declaration specifier. 4230 /// 4231 /// \param DisambiguatingWithExpression True to indicate that the purpose of 4232 /// this check is to disambiguate between an expression and a declaration. 4233 bool Parser::isDeclarationSpecifier(bool DisambiguatingWithExpression) { 4234 switch (Tok.getKind()) { 4235 default: return false; 4236 4237 case tok::identifier: // foo::bar 4238 // Unfortunate hack to support "Class.factoryMethod" notation. 4239 if (getLangOpts().ObjC1 && NextToken().is(tok::period)) 4240 return false; 4241 if (TryAltiVecVectorToken()) 4242 return true; 4243 // Fall through. 4244 case tok::kw_decltype: // decltype(T())::type 4245 case tok::kw_typename: // typename T::type 4246 // Annotate typenames and C++ scope specifiers. If we get one, just 4247 // recurse to handle whatever we get. 4248 if (TryAnnotateTypeOrScopeToken()) 4249 return true; 4250 if (Tok.is(tok::identifier)) 4251 return false; 4252 4253 // If we're in Objective-C and we have an Objective-C class type followed 4254 // by an identifier and then either ':' or ']', in a place where an 4255 // expression is permitted, then this is probably a class message send 4256 // missing the initial '['. In this case, we won't consider this to be 4257 // the start of a declaration. 4258 if (DisambiguatingWithExpression && 4259 isStartOfObjCClassMessageMissingOpenBracket()) 4260 return false; 4261 4262 return isDeclarationSpecifier(); 4263 4264 case tok::coloncolon: // ::foo::bar 4265 if (NextToken().is(tok::kw_new) || // ::new 4266 NextToken().is(tok::kw_delete)) // ::delete 4267 return false; 4268 4269 // Annotate typenames and C++ scope specifiers. If we get one, just 4270 // recurse to handle whatever we get. 4271 if (TryAnnotateTypeOrScopeToken()) 4272 return true; 4273 return isDeclarationSpecifier(); 4274 4275 // storage-class-specifier 4276 case tok::kw_typedef: 4277 case tok::kw_extern: 4278 case tok::kw___private_extern__: 4279 case tok::kw_static: 4280 case tok::kw_auto: 4281 case tok::kw_register: 4282 case tok::kw___thread: 4283 case tok::kw_thread_local: 4284 case tok::kw__Thread_local: 4285 4286 // Modules 4287 case tok::kw___module_private__: 4288 4289 // Debugger support 4290 case tok::kw___unknown_anytype: 4291 4292 // type-specifiers 4293 case tok::kw_short: 4294 case tok::kw_long: 4295 case tok::kw___int64: 4296 case tok::kw___int128: 4297 case tok::kw_signed: 4298 case tok::kw_unsigned: 4299 case tok::kw__Complex: 4300 case tok::kw__Imaginary: 4301 case tok::kw_void: 4302 case tok::kw_char: 4303 case tok::kw_wchar_t: 4304 case tok::kw_char16_t: 4305 case tok::kw_char32_t: 4306 4307 case tok::kw_int: 4308 case tok::kw_half: 4309 case tok::kw_float: 4310 case tok::kw_double: 4311 case tok::kw_bool: 4312 case tok::kw__Bool: 4313 case tok::kw__Decimal32: 4314 case tok::kw__Decimal64: 4315 case tok::kw__Decimal128: 4316 case tok::kw___vector: 4317 4318 // struct-or-union-specifier (C99) or class-specifier (C++) 4319 case tok::kw_class: 4320 case tok::kw_struct: 4321 case tok::kw_union: 4322 case tok::kw___interface: 4323 // enum-specifier 4324 case tok::kw_enum: 4325 4326 // type-qualifier 4327 case tok::kw_const: 4328 case tok::kw_volatile: 4329 case tok::kw_restrict: 4330 4331 // function-specifier 4332 case tok::kw_inline: 4333 case tok::kw_virtual: 4334 case tok::kw_explicit: 4335 case tok::kw__Noreturn: 4336 4337 // alignment-specifier 4338 case tok::kw__Alignas: 4339 4340 // friend keyword. 4341 case tok::kw_friend: 4342 4343 // static_assert-declaration 4344 case tok::kw__Static_assert: 4345 4346 // GNU typeof support. 4347 case tok::kw_typeof: 4348 4349 // GNU attributes. 4350 case tok::kw___attribute: 4351 4352 // C++11 decltype and constexpr. 4353 case tok::annot_decltype: 4354 case tok::kw_constexpr: 4355 4356 // C11 _Atomic 4357 case tok::kw__Atomic: 4358 return true; 4359 4360 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'. 4361 case tok::less: 4362 return getLangOpts().ObjC1; 4363 4364 // typedef-name 4365 case tok::annot_typename: 4366 return !DisambiguatingWithExpression || 4367 !isStartOfObjCClassMessageMissingOpenBracket(); 4368 4369 case tok::kw___declspec: 4370 case tok::kw___cdecl: 4371 case tok::kw___stdcall: 4372 case tok::kw___fastcall: 4373 case tok::kw___thiscall: 4374 case tok::kw___vectorcall: 4375 case tok::kw___w64: 4376 case tok::kw___sptr: 4377 case tok::kw___uptr: 4378 case tok::kw___ptr64: 4379 case tok::kw___ptr32: 4380 case tok::kw___forceinline: 4381 case tok::kw___pascal: 4382 case tok::kw___unaligned: 4383 4384 case tok::kw___private: 4385 case tok::kw___local: 4386 case tok::kw___global: 4387 case tok::kw___constant: 4388 case tok::kw___generic: 4389 case tok::kw___read_only: 4390 case tok::kw___read_write: 4391 case tok::kw___write_only: 4392 4393 return true; 4394 } 4395 } 4396 4397 bool Parser::isConstructorDeclarator(bool IsUnqualified) { 4398 TentativeParsingAction TPA(*this); 4399 4400 // Parse the C++ scope specifier. 4401 CXXScopeSpec SS; 4402 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 4403 /*EnteringContext=*/true)) { 4404 TPA.Revert(); 4405 return false; 4406 } 4407 4408 // Parse the constructor name. 4409 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id)) { 4410 // We already know that we have a constructor name; just consume 4411 // the token. 4412 ConsumeToken(); 4413 } else { 4414 TPA.Revert(); 4415 return false; 4416 } 4417 4418 // Current class name must be followed by a left parenthesis. 4419 if (Tok.isNot(tok::l_paren)) { 4420 TPA.Revert(); 4421 return false; 4422 } 4423 ConsumeParen(); 4424 4425 // A right parenthesis, or ellipsis followed by a right parenthesis signals 4426 // that we have a constructor. 4427 if (Tok.is(tok::r_paren) || 4428 (Tok.is(tok::ellipsis) && NextToken().is(tok::r_paren))) { 4429 TPA.Revert(); 4430 return true; 4431 } 4432 4433 // A C++11 attribute here signals that we have a constructor, and is an 4434 // attribute on the first constructor parameter. 4435 if (getLangOpts().CPlusPlus11 && 4436 isCXX11AttributeSpecifier(/*Disambiguate*/ false, 4437 /*OuterMightBeMessageSend*/ true)) { 4438 TPA.Revert(); 4439 return true; 4440 } 4441 4442 // If we need to, enter the specified scope. 4443 DeclaratorScopeObj DeclScopeObj(*this, SS); 4444 if (SS.isSet() && Actions.ShouldEnterDeclaratorScope(getCurScope(), SS)) 4445 DeclScopeObj.EnterDeclaratorScope(); 4446 4447 // Optionally skip Microsoft attributes. 4448 ParsedAttributes Attrs(AttrFactory); 4449 MaybeParseMicrosoftAttributes(Attrs); 4450 4451 // Check whether the next token(s) are part of a declaration 4452 // specifier, in which case we have the start of a parameter and, 4453 // therefore, we know that this is a constructor. 4454 bool IsConstructor = false; 4455 if (isDeclarationSpecifier()) 4456 IsConstructor = true; 4457 else if (Tok.is(tok::identifier) || 4458 (Tok.is(tok::annot_cxxscope) && NextToken().is(tok::identifier))) { 4459 // We've seen "C ( X" or "C ( X::Y", but "X" / "X::Y" is not a type. 4460 // This might be a parenthesized member name, but is more likely to 4461 // be a constructor declaration with an invalid argument type. Keep 4462 // looking. 4463 if (Tok.is(tok::annot_cxxscope)) 4464 ConsumeToken(); 4465 ConsumeToken(); 4466 4467 // If this is not a constructor, we must be parsing a declarator, 4468 // which must have one of the following syntactic forms (see the 4469 // grammar extract at the start of ParseDirectDeclarator): 4470 switch (Tok.getKind()) { 4471 case tok::l_paren: 4472 // C(X ( int)); 4473 case tok::l_square: 4474 // C(X [ 5]); 4475 // C(X [ [attribute]]); 4476 case tok::coloncolon: 4477 // C(X :: Y); 4478 // C(X :: *p); 4479 // Assume this isn't a constructor, rather than assuming it's a 4480 // constructor with an unnamed parameter of an ill-formed type. 4481 break; 4482 4483 case tok::r_paren: 4484 // C(X ) 4485 if (NextToken().is(tok::colon) || NextToken().is(tok::kw_try)) { 4486 // Assume these were meant to be constructors: 4487 // C(X) : (the name of a bit-field cannot be parenthesized). 4488 // C(X) try (this is otherwise ill-formed). 4489 IsConstructor = true; 4490 } 4491 if (NextToken().is(tok::semi) || NextToken().is(tok::l_brace)) { 4492 // If we have a constructor name within the class definition, 4493 // assume these were meant to be constructors: 4494 // C(X) { 4495 // C(X) ; 4496 // ... because otherwise we would be declaring a non-static data 4497 // member that is ill-formed because it's of the same type as its 4498 // surrounding class. 4499 // 4500 // FIXME: We can actually do this whether or not the name is qualified, 4501 // because if it is qualified in this context it must be being used as 4502 // a constructor name. However, we do not implement that rule correctly 4503 // currently, so we're somewhat conservative here. 4504 IsConstructor = IsUnqualified; 4505 } 4506 break; 4507 4508 default: 4509 IsConstructor = true; 4510 break; 4511 } 4512 } 4513 4514 TPA.Revert(); 4515 return IsConstructor; 4516 } 4517 4518 /// ParseTypeQualifierListOpt 4519 /// type-qualifier-list: [C99 6.7.5] 4520 /// type-qualifier 4521 /// [vendor] attributes 4522 /// [ only if AttrReqs & AR_VendorAttributesParsed ] 4523 /// type-qualifier-list type-qualifier 4524 /// [vendor] type-qualifier-list attributes 4525 /// [ only if AttrReqs & AR_VendorAttributesParsed ] 4526 /// [C++0x] attribute-specifier[opt] is allowed before cv-qualifier-seq 4527 /// [ only if AttReqs & AR_CXX11AttributesParsed ] 4528 /// Note: vendor can be GNU, MS, etc and can be explicitly controlled via 4529 /// AttrRequirements bitmask values. 4530 void Parser::ParseTypeQualifierListOpt(DeclSpec &DS, unsigned AttrReqs, 4531 bool AtomicAllowed, 4532 bool IdentifierRequired) { 4533 if (getLangOpts().CPlusPlus11 && (AttrReqs & AR_CXX11AttributesParsed) && 4534 isCXX11AttributeSpecifier()) { 4535 ParsedAttributesWithRange attrs(AttrFactory); 4536 ParseCXX11Attributes(attrs); 4537 DS.takeAttributesFrom(attrs); 4538 } 4539 4540 SourceLocation EndLoc; 4541 4542 while (1) { 4543 bool isInvalid = false; 4544 const char *PrevSpec = nullptr; 4545 unsigned DiagID = 0; 4546 SourceLocation Loc = Tok.getLocation(); 4547 4548 switch (Tok.getKind()) { 4549 case tok::code_completion: 4550 Actions.CodeCompleteTypeQualifiers(DS); 4551 return cutOffParsing(); 4552 4553 case tok::kw_const: 4554 isInvalid = DS.SetTypeQual(DeclSpec::TQ_const , Loc, PrevSpec, DiagID, 4555 getLangOpts()); 4556 break; 4557 case tok::kw_volatile: 4558 isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID, 4559 getLangOpts()); 4560 break; 4561 case tok::kw_restrict: 4562 isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID, 4563 getLangOpts()); 4564 break; 4565 case tok::kw__Atomic: 4566 if (!AtomicAllowed) 4567 goto DoneWithTypeQuals; 4568 isInvalid = DS.SetTypeQual(DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID, 4569 getLangOpts()); 4570 break; 4571 4572 // OpenCL qualifiers: 4573 case tok::kw___private: 4574 case tok::kw___global: 4575 case tok::kw___local: 4576 case tok::kw___constant: 4577 case tok::kw___generic: 4578 case tok::kw___read_only: 4579 case tok::kw___write_only: 4580 case tok::kw___read_write: 4581 ParseOpenCLQualifiers(DS.getAttributes()); 4582 break; 4583 4584 case tok::kw___uptr: 4585 // GNU libc headers in C mode use '__uptr' as an identifer which conflicts 4586 // with the MS modifier keyword. 4587 if ((AttrReqs & AR_DeclspecAttributesParsed) && !getLangOpts().CPlusPlus && 4588 IdentifierRequired && DS.isEmpty() && NextToken().is(tok::semi)) { 4589 if (TryKeywordIdentFallback(false)) 4590 continue; 4591 } 4592 case tok::kw___sptr: 4593 case tok::kw___w64: 4594 case tok::kw___ptr64: 4595 case tok::kw___ptr32: 4596 case tok::kw___cdecl: 4597 case tok::kw___stdcall: 4598 case tok::kw___fastcall: 4599 case tok::kw___thiscall: 4600 case tok::kw___vectorcall: 4601 case tok::kw___unaligned: 4602 if (AttrReqs & AR_DeclspecAttributesParsed) { 4603 ParseMicrosoftTypeAttributes(DS.getAttributes()); 4604 continue; 4605 } 4606 goto DoneWithTypeQuals; 4607 case tok::kw___pascal: 4608 if (AttrReqs & AR_VendorAttributesParsed) { 4609 ParseBorlandTypeAttributes(DS.getAttributes()); 4610 continue; 4611 } 4612 goto DoneWithTypeQuals; 4613 case tok::kw___attribute: 4614 if (AttrReqs & AR_GNUAttributesParsedAndRejected) 4615 // When GNU attributes are expressly forbidden, diagnose their usage. 4616 Diag(Tok, diag::err_attributes_not_allowed); 4617 4618 // Parse the attributes even if they are rejected to ensure that error 4619 // recovery is graceful. 4620 if (AttrReqs & AR_GNUAttributesParsed || 4621 AttrReqs & AR_GNUAttributesParsedAndRejected) { 4622 ParseGNUAttributes(DS.getAttributes()); 4623 continue; // do *not* consume the next token! 4624 } 4625 // otherwise, FALL THROUGH! 4626 default: 4627 DoneWithTypeQuals: 4628 // If this is not a type-qualifier token, we're done reading type 4629 // qualifiers. First verify that DeclSpec's are consistent. 4630 DS.Finish(Diags, PP, Actions.getASTContext().getPrintingPolicy()); 4631 if (EndLoc.isValid()) 4632 DS.SetRangeEnd(EndLoc); 4633 return; 4634 } 4635 4636 // If the specifier combination wasn't legal, issue a diagnostic. 4637 if (isInvalid) { 4638 assert(PrevSpec && "Method did not return previous specifier!"); 4639 Diag(Tok, DiagID) << PrevSpec; 4640 } 4641 EndLoc = ConsumeToken(); 4642 } 4643 } 4644 4645 4646 /// ParseDeclarator - Parse and verify a newly-initialized declarator. 4647 /// 4648 void Parser::ParseDeclarator(Declarator &D) { 4649 /// This implements the 'declarator' production in the C grammar, then checks 4650 /// for well-formedness and issues diagnostics. 4651 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator); 4652 } 4653 4654 static bool isPtrOperatorToken(tok::TokenKind Kind, const LangOptions &Lang, 4655 unsigned TheContext) { 4656 if (Kind == tok::star || Kind == tok::caret) 4657 return true; 4658 4659 if (!Lang.CPlusPlus) 4660 return false; 4661 4662 if (Kind == tok::amp) 4663 return true; 4664 4665 // We parse rvalue refs in C++03, because otherwise the errors are scary. 4666 // But we must not parse them in conversion-type-ids and new-type-ids, since 4667 // those can be legitimately followed by a && operator. 4668 // (The same thing can in theory happen after a trailing-return-type, but 4669 // since those are a C++11 feature, there is no rejects-valid issue there.) 4670 if (Kind == tok::ampamp) 4671 return Lang.CPlusPlus11 || (TheContext != Declarator::ConversionIdContext && 4672 TheContext != Declarator::CXXNewContext); 4673 4674 return false; 4675 } 4676 4677 /// ParseDeclaratorInternal - Parse a C or C++ declarator. The direct-declarator 4678 /// is parsed by the function passed to it. Pass null, and the direct-declarator 4679 /// isn't parsed at all, making this function effectively parse the C++ 4680 /// ptr-operator production. 4681 /// 4682 /// If the grammar of this construct is extended, matching changes must also be 4683 /// made to TryParseDeclarator and MightBeDeclarator, and possibly to 4684 /// isConstructorDeclarator. 4685 /// 4686 /// declarator: [C99 6.7.5] [C++ 8p4, dcl.decl] 4687 /// [C] pointer[opt] direct-declarator 4688 /// [C++] direct-declarator 4689 /// [C++] ptr-operator declarator 4690 /// 4691 /// pointer: [C99 6.7.5] 4692 /// '*' type-qualifier-list[opt] 4693 /// '*' type-qualifier-list[opt] pointer 4694 /// 4695 /// ptr-operator: 4696 /// '*' cv-qualifier-seq[opt] 4697 /// '&' 4698 /// [C++0x] '&&' 4699 /// [GNU] '&' restrict[opt] attributes[opt] 4700 /// [GNU?] '&&' restrict[opt] attributes[opt] 4701 /// '::'[opt] nested-name-specifier '*' cv-qualifier-seq[opt] 4702 void Parser::ParseDeclaratorInternal(Declarator &D, 4703 DirectDeclParseFunction DirectDeclParser) { 4704 if (Diags.hasAllExtensionsSilenced()) 4705 D.setExtension(); 4706 4707 // C++ member pointers start with a '::' or a nested-name. 4708 // Member pointers get special handling, since there's no place for the 4709 // scope spec in the generic path below. 4710 if (getLangOpts().CPlusPlus && 4711 (Tok.is(tok::coloncolon) || 4712 (Tok.is(tok::identifier) && 4713 (NextToken().is(tok::coloncolon) || NextToken().is(tok::less))) || 4714 Tok.is(tok::annot_cxxscope))) { 4715 bool EnteringContext = D.getContext() == Declarator::FileContext || 4716 D.getContext() == Declarator::MemberContext; 4717 CXXScopeSpec SS; 4718 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext); 4719 4720 if (SS.isNotEmpty()) { 4721 if (Tok.isNot(tok::star)) { 4722 // The scope spec really belongs to the direct-declarator. 4723 if (D.mayHaveIdentifier()) 4724 D.getCXXScopeSpec() = SS; 4725 else 4726 AnnotateScopeToken(SS, true); 4727 4728 if (DirectDeclParser) 4729 (this->*DirectDeclParser)(D); 4730 return; 4731 } 4732 4733 SourceLocation Loc = ConsumeToken(); 4734 D.SetRangeEnd(Loc); 4735 DeclSpec DS(AttrFactory); 4736 ParseTypeQualifierListOpt(DS); 4737 D.ExtendWithDeclSpec(DS); 4738 4739 // Recurse to parse whatever is left. 4740 ParseDeclaratorInternal(D, DirectDeclParser); 4741 4742 // Sema will have to catch (syntactically invalid) pointers into global 4743 // scope. It has to catch pointers into namespace scope anyway. 4744 D.AddTypeInfo(DeclaratorChunk::getMemberPointer(SS,DS.getTypeQualifiers(), 4745 DS.getLocEnd()), 4746 DS.getAttributes(), 4747 /* Don't replace range end. */SourceLocation()); 4748 return; 4749 } 4750 } 4751 4752 tok::TokenKind Kind = Tok.getKind(); 4753 // Not a pointer, C++ reference, or block. 4754 if (!isPtrOperatorToken(Kind, getLangOpts(), D.getContext())) { 4755 if (DirectDeclParser) 4756 (this->*DirectDeclParser)(D); 4757 return; 4758 } 4759 4760 // Otherwise, '*' -> pointer, '^' -> block, '&' -> lvalue reference, 4761 // '&&' -> rvalue reference 4762 SourceLocation Loc = ConsumeToken(); // Eat the *, ^, & or &&. 4763 D.SetRangeEnd(Loc); 4764 4765 if (Kind == tok::star || Kind == tok::caret) { 4766 // Is a pointer. 4767 DeclSpec DS(AttrFactory); 4768 4769 // GNU attributes are not allowed here in a new-type-id, but Declspec and 4770 // C++11 attributes are allowed. 4771 unsigned Reqs = AR_CXX11AttributesParsed | AR_DeclspecAttributesParsed | 4772 ((D.getContext() != Declarator::CXXNewContext) 4773 ? AR_GNUAttributesParsed 4774 : AR_GNUAttributesParsedAndRejected); 4775 ParseTypeQualifierListOpt(DS, Reqs, true, !D.mayOmitIdentifier()); 4776 D.ExtendWithDeclSpec(DS); 4777 4778 // Recursively parse the declarator. 4779 ParseDeclaratorInternal(D, DirectDeclParser); 4780 if (Kind == tok::star) 4781 // Remember that we parsed a pointer type, and remember the type-quals. 4782 D.AddTypeInfo(DeclaratorChunk::getPointer(DS.getTypeQualifiers(), Loc, 4783 DS.getConstSpecLoc(), 4784 DS.getVolatileSpecLoc(), 4785 DS.getRestrictSpecLoc(), 4786 DS.getAtomicSpecLoc()), 4787 DS.getAttributes(), 4788 SourceLocation()); 4789 else 4790 // Remember that we parsed a Block type, and remember the type-quals. 4791 D.AddTypeInfo(DeclaratorChunk::getBlockPointer(DS.getTypeQualifiers(), 4792 Loc), 4793 DS.getAttributes(), 4794 SourceLocation()); 4795 } else { 4796 // Is a reference 4797 DeclSpec DS(AttrFactory); 4798 4799 // Complain about rvalue references in C++03, but then go on and build 4800 // the declarator. 4801 if (Kind == tok::ampamp) 4802 Diag(Loc, getLangOpts().CPlusPlus11 ? 4803 diag::warn_cxx98_compat_rvalue_reference : 4804 diag::ext_rvalue_reference); 4805 4806 // GNU-style and C++11 attributes are allowed here, as is restrict. 4807 ParseTypeQualifierListOpt(DS); 4808 D.ExtendWithDeclSpec(DS); 4809 4810 // C++ 8.3.2p1: cv-qualified references are ill-formed except when the 4811 // cv-qualifiers are introduced through the use of a typedef or of a 4812 // template type argument, in which case the cv-qualifiers are ignored. 4813 if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) { 4814 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 4815 Diag(DS.getConstSpecLoc(), 4816 diag::err_invalid_reference_qualifier_application) << "const"; 4817 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 4818 Diag(DS.getVolatileSpecLoc(), 4819 diag::err_invalid_reference_qualifier_application) << "volatile"; 4820 // 'restrict' is permitted as an extension. 4821 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic) 4822 Diag(DS.getAtomicSpecLoc(), 4823 diag::err_invalid_reference_qualifier_application) << "_Atomic"; 4824 } 4825 4826 // Recursively parse the declarator. 4827 ParseDeclaratorInternal(D, DirectDeclParser); 4828 4829 if (D.getNumTypeObjects() > 0) { 4830 // C++ [dcl.ref]p4: There shall be no references to references. 4831 DeclaratorChunk& InnerChunk = D.getTypeObject(D.getNumTypeObjects() - 1); 4832 if (InnerChunk.Kind == DeclaratorChunk::Reference) { 4833 if (const IdentifierInfo *II = D.getIdentifier()) 4834 Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference) 4835 << II; 4836 else 4837 Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference) 4838 << "type name"; 4839 4840 // Once we've complained about the reference-to-reference, we 4841 // can go ahead and build the (technically ill-formed) 4842 // declarator: reference collapsing will take care of it. 4843 } 4844 } 4845 4846 // Remember that we parsed a reference type. 4847 D.AddTypeInfo(DeclaratorChunk::getReference(DS.getTypeQualifiers(), Loc, 4848 Kind == tok::amp), 4849 DS.getAttributes(), 4850 SourceLocation()); 4851 } 4852 } 4853 4854 // When correcting from misplaced brackets before the identifier, the location 4855 // is saved inside the declarator so that other diagnostic messages can use 4856 // them. This extracts and returns that location, or returns the provided 4857 // location if a stored location does not exist. 4858 static SourceLocation getMissingDeclaratorIdLoc(Declarator &D, 4859 SourceLocation Loc) { 4860 if (D.getName().StartLocation.isInvalid() && 4861 D.getName().EndLocation.isValid()) 4862 return D.getName().EndLocation; 4863 4864 return Loc; 4865 } 4866 4867 /// ParseDirectDeclarator 4868 /// direct-declarator: [C99 6.7.5] 4869 /// [C99] identifier 4870 /// '(' declarator ')' 4871 /// [GNU] '(' attributes declarator ')' 4872 /// [C90] direct-declarator '[' constant-expression[opt] ']' 4873 /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']' 4874 /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']' 4875 /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']' 4876 /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']' 4877 /// [C++11] direct-declarator '[' constant-expression[opt] ']' 4878 /// attribute-specifier-seq[opt] 4879 /// direct-declarator '(' parameter-type-list ')' 4880 /// direct-declarator '(' identifier-list[opt] ')' 4881 /// [GNU] direct-declarator '(' parameter-forward-declarations 4882 /// parameter-type-list[opt] ')' 4883 /// [C++] direct-declarator '(' parameter-declaration-clause ')' 4884 /// cv-qualifier-seq[opt] exception-specification[opt] 4885 /// [C++11] direct-declarator '(' parameter-declaration-clause ')' 4886 /// attribute-specifier-seq[opt] cv-qualifier-seq[opt] 4887 /// ref-qualifier[opt] exception-specification[opt] 4888 /// [C++] declarator-id 4889 /// [C++11] declarator-id attribute-specifier-seq[opt] 4890 /// 4891 /// declarator-id: [C++ 8] 4892 /// '...'[opt] id-expression 4893 /// '::'[opt] nested-name-specifier[opt] type-name 4894 /// 4895 /// id-expression: [C++ 5.1] 4896 /// unqualified-id 4897 /// qualified-id 4898 /// 4899 /// unqualified-id: [C++ 5.1] 4900 /// identifier 4901 /// operator-function-id 4902 /// conversion-function-id 4903 /// '~' class-name 4904 /// template-id 4905 /// 4906 /// Note, any additional constructs added here may need corresponding changes 4907 /// in isConstructorDeclarator. 4908 void Parser::ParseDirectDeclarator(Declarator &D) { 4909 DeclaratorScopeObj DeclScopeObj(*this, D.getCXXScopeSpec()); 4910 4911 if (getLangOpts().CPlusPlus && D.mayHaveIdentifier()) { 4912 // Don't parse FOO:BAR as if it were a typo for FOO::BAR inside a class, in 4913 // this context it is a bitfield. Also in range-based for statement colon 4914 // may delimit for-range-declaration. 4915 ColonProtectionRAIIObject X(*this, 4916 D.getContext() == Declarator::MemberContext || 4917 (D.getContext() == Declarator::ForContext && 4918 getLangOpts().CPlusPlus11)); 4919 4920 // ParseDeclaratorInternal might already have parsed the scope. 4921 if (D.getCXXScopeSpec().isEmpty()) { 4922 bool EnteringContext = D.getContext() == Declarator::FileContext || 4923 D.getContext() == Declarator::MemberContext; 4924 ParseOptionalCXXScopeSpecifier(D.getCXXScopeSpec(), ParsedType(), 4925 EnteringContext); 4926 } 4927 4928 if (D.getCXXScopeSpec().isValid()) { 4929 if (Actions.ShouldEnterDeclaratorScope(getCurScope(), 4930 D.getCXXScopeSpec())) 4931 // Change the declaration context for name lookup, until this function 4932 // is exited (and the declarator has been parsed). 4933 DeclScopeObj.EnterDeclaratorScope(); 4934 } 4935 4936 // C++0x [dcl.fct]p14: 4937 // There is a syntactic ambiguity when an ellipsis occurs at the end of a 4938 // parameter-declaration-clause without a preceding comma. In this case, 4939 // the ellipsis is parsed as part of the abstract-declarator if the type 4940 // of the parameter either names a template parameter pack that has not 4941 // been expanded or contains auto; otherwise, it is parsed as part of the 4942 // parameter-declaration-clause. 4943 if (Tok.is(tok::ellipsis) && D.getCXXScopeSpec().isEmpty() && 4944 !((D.getContext() == Declarator::PrototypeContext || 4945 D.getContext() == Declarator::LambdaExprParameterContext || 4946 D.getContext() == Declarator::BlockLiteralContext) && 4947 NextToken().is(tok::r_paren) && 4948 !D.hasGroupingParens() && 4949 !Actions.containsUnexpandedParameterPacks(D) && 4950 D.getDeclSpec().getTypeSpecType() != TST_auto)) { 4951 SourceLocation EllipsisLoc = ConsumeToken(); 4952 if (isPtrOperatorToken(Tok.getKind(), getLangOpts(), D.getContext())) { 4953 // The ellipsis was put in the wrong place. Recover, and explain to 4954 // the user what they should have done. 4955 ParseDeclarator(D); 4956 if (EllipsisLoc.isValid()) 4957 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D); 4958 return; 4959 } else 4960 D.setEllipsisLoc(EllipsisLoc); 4961 4962 // The ellipsis can't be followed by a parenthesized declarator. We 4963 // check for that in ParseParenDeclarator, after we have disambiguated 4964 // the l_paren token. 4965 } 4966 4967 if (Tok.is(tok::identifier) || Tok.is(tok::kw_operator) || 4968 Tok.is(tok::annot_template_id) || Tok.is(tok::tilde)) { 4969 // We found something that indicates the start of an unqualified-id. 4970 // Parse that unqualified-id. 4971 bool AllowConstructorName; 4972 if (D.getDeclSpec().hasTypeSpecifier()) 4973 AllowConstructorName = false; 4974 else if (D.getCXXScopeSpec().isSet()) 4975 AllowConstructorName = 4976 (D.getContext() == Declarator::FileContext || 4977 D.getContext() == Declarator::MemberContext); 4978 else 4979 AllowConstructorName = (D.getContext() == Declarator::MemberContext); 4980 4981 SourceLocation TemplateKWLoc; 4982 bool HadScope = D.getCXXScopeSpec().isValid(); 4983 if (ParseUnqualifiedId(D.getCXXScopeSpec(), 4984 /*EnteringContext=*/true, 4985 /*AllowDestructorName=*/true, 4986 AllowConstructorName, 4987 ParsedType(), 4988 TemplateKWLoc, 4989 D.getName()) || 4990 // Once we're past the identifier, if the scope was bad, mark the 4991 // whole declarator bad. 4992 D.getCXXScopeSpec().isInvalid()) { 4993 D.SetIdentifier(nullptr, Tok.getLocation()); 4994 D.setInvalidType(true); 4995 } else { 4996 // ParseUnqualifiedId might have parsed a scope specifier during error 4997 // recovery. If it did so, enter that scope. 4998 if (!HadScope && D.getCXXScopeSpec().isValid() && 4999 Actions.ShouldEnterDeclaratorScope(getCurScope(), 5000 D.getCXXScopeSpec())) 5001 DeclScopeObj.EnterDeclaratorScope(); 5002 5003 // Parsed the unqualified-id; update range information and move along. 5004 if (D.getSourceRange().getBegin().isInvalid()) 5005 D.SetRangeBegin(D.getName().getSourceRange().getBegin()); 5006 D.SetRangeEnd(D.getName().getSourceRange().getEnd()); 5007 } 5008 goto PastIdentifier; 5009 } 5010 } else if (Tok.is(tok::identifier) && D.mayHaveIdentifier()) { 5011 assert(!getLangOpts().CPlusPlus && 5012 "There's a C++-specific check for tok::identifier above"); 5013 assert(Tok.getIdentifierInfo() && "Not an identifier?"); 5014 D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 5015 D.SetRangeEnd(Tok.getLocation()); 5016 ConsumeToken(); 5017 goto PastIdentifier; 5018 } else if (Tok.is(tok::identifier) && D.diagnoseIdentifier()) { 5019 // A virt-specifier isn't treated as an identifier if it appears after a 5020 // trailing-return-type. 5021 if (D.getContext() != Declarator::TrailingReturnContext || 5022 !isCXX11VirtSpecifier(Tok)) { 5023 Diag(Tok.getLocation(), diag::err_unexpected_unqualified_id) 5024 << FixItHint::CreateRemoval(Tok.getLocation()); 5025 D.SetIdentifier(nullptr, Tok.getLocation()); 5026 ConsumeToken(); 5027 goto PastIdentifier; 5028 } 5029 } 5030 5031 if (Tok.is(tok::l_paren)) { 5032 // direct-declarator: '(' declarator ')' 5033 // direct-declarator: '(' attributes declarator ')' 5034 // Example: 'char (*X)' or 'int (*XX)(void)' 5035 ParseParenDeclarator(D); 5036 5037 // If the declarator was parenthesized, we entered the declarator 5038 // scope when parsing the parenthesized declarator, then exited 5039 // the scope already. Re-enter the scope, if we need to. 5040 if (D.getCXXScopeSpec().isSet()) { 5041 // If there was an error parsing parenthesized declarator, declarator 5042 // scope may have been entered before. Don't do it again. 5043 if (!D.isInvalidType() && 5044 Actions.ShouldEnterDeclaratorScope(getCurScope(), 5045 D.getCXXScopeSpec())) 5046 // Change the declaration context for name lookup, until this function 5047 // is exited (and the declarator has been parsed). 5048 DeclScopeObj.EnterDeclaratorScope(); 5049 } 5050 } else if (D.mayOmitIdentifier()) { 5051 // This could be something simple like "int" (in which case the declarator 5052 // portion is empty), if an abstract-declarator is allowed. 5053 D.SetIdentifier(nullptr, Tok.getLocation()); 5054 5055 // The grammar for abstract-pack-declarator does not allow grouping parens. 5056 // FIXME: Revisit this once core issue 1488 is resolved. 5057 if (D.hasEllipsis() && D.hasGroupingParens()) 5058 Diag(PP.getLocForEndOfToken(D.getEllipsisLoc()), 5059 diag::ext_abstract_pack_declarator_parens); 5060 } else { 5061 if (Tok.getKind() == tok::annot_pragma_parser_crash) 5062 LLVM_BUILTIN_TRAP; 5063 if (Tok.is(tok::l_square)) 5064 return ParseMisplacedBracketDeclarator(D); 5065 if (D.getContext() == Declarator::MemberContext) { 5066 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()), 5067 diag::err_expected_member_name_or_semi) 5068 << (D.getDeclSpec().isEmpty() ? SourceRange() 5069 : D.getDeclSpec().getSourceRange()); 5070 } else if (getLangOpts().CPlusPlus) { 5071 if (Tok.is(tok::period) || Tok.is(tok::arrow)) 5072 Diag(Tok, diag::err_invalid_operator_on_type) << Tok.is(tok::arrow); 5073 else { 5074 SourceLocation Loc = D.getCXXScopeSpec().getEndLoc(); 5075 if (Tok.isAtStartOfLine() && Loc.isValid()) 5076 Diag(PP.getLocForEndOfToken(Loc), diag::err_expected_unqualified_id) 5077 << getLangOpts().CPlusPlus; 5078 else 5079 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()), 5080 diag::err_expected_unqualified_id) 5081 << getLangOpts().CPlusPlus; 5082 } 5083 } else { 5084 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()), 5085 diag::err_expected_either) 5086 << tok::identifier << tok::l_paren; 5087 } 5088 D.SetIdentifier(nullptr, Tok.getLocation()); 5089 D.setInvalidType(true); 5090 } 5091 5092 PastIdentifier: 5093 assert(D.isPastIdentifier() && 5094 "Haven't past the location of the identifier yet?"); 5095 5096 // Don't parse attributes unless we have parsed an unparenthesized name. 5097 if (D.hasName() && !D.getNumTypeObjects()) 5098 MaybeParseCXX11Attributes(D); 5099 5100 while (1) { 5101 if (Tok.is(tok::l_paren)) { 5102 // Enter function-declaration scope, limiting any declarators to the 5103 // function prototype scope, including parameter declarators. 5104 ParseScope PrototypeScope(this, 5105 Scope::FunctionPrototypeScope|Scope::DeclScope| 5106 (D.isFunctionDeclaratorAFunctionDeclaration() 5107 ? Scope::FunctionDeclarationScope : 0)); 5108 5109 // The paren may be part of a C++ direct initializer, eg. "int x(1);". 5110 // In such a case, check if we actually have a function declarator; if it 5111 // is not, the declarator has been fully parsed. 5112 bool IsAmbiguous = false; 5113 if (getLangOpts().CPlusPlus && D.mayBeFollowedByCXXDirectInit()) { 5114 // The name of the declarator, if any, is tentatively declared within 5115 // a possible direct initializer. 5116 TentativelyDeclaredIdentifiers.push_back(D.getIdentifier()); 5117 bool IsFunctionDecl = isCXXFunctionDeclarator(&IsAmbiguous); 5118 TentativelyDeclaredIdentifiers.pop_back(); 5119 if (!IsFunctionDecl) 5120 break; 5121 } 5122 ParsedAttributes attrs(AttrFactory); 5123 BalancedDelimiterTracker T(*this, tok::l_paren); 5124 T.consumeOpen(); 5125 ParseFunctionDeclarator(D, attrs, T, IsAmbiguous); 5126 PrototypeScope.Exit(); 5127 } else if (Tok.is(tok::l_square)) { 5128 ParseBracketDeclarator(D); 5129 } else { 5130 break; 5131 } 5132 } 5133 } 5134 5135 /// ParseParenDeclarator - We parsed the declarator D up to a paren. This is 5136 /// only called before the identifier, so these are most likely just grouping 5137 /// parens for precedence. If we find that these are actually function 5138 /// parameter parens in an abstract-declarator, we call ParseFunctionDeclarator. 5139 /// 5140 /// direct-declarator: 5141 /// '(' declarator ')' 5142 /// [GNU] '(' attributes declarator ')' 5143 /// direct-declarator '(' parameter-type-list ')' 5144 /// direct-declarator '(' identifier-list[opt] ')' 5145 /// [GNU] direct-declarator '(' parameter-forward-declarations 5146 /// parameter-type-list[opt] ')' 5147 /// 5148 void Parser::ParseParenDeclarator(Declarator &D) { 5149 BalancedDelimiterTracker T(*this, tok::l_paren); 5150 T.consumeOpen(); 5151 5152 assert(!D.isPastIdentifier() && "Should be called before passing identifier"); 5153 5154 // Eat any attributes before we look at whether this is a grouping or function 5155 // declarator paren. If this is a grouping paren, the attribute applies to 5156 // the type being built up, for example: 5157 // int (__attribute__(()) *x)(long y) 5158 // If this ends up not being a grouping paren, the attribute applies to the 5159 // first argument, for example: 5160 // int (__attribute__(()) int x) 5161 // In either case, we need to eat any attributes to be able to determine what 5162 // sort of paren this is. 5163 // 5164 ParsedAttributes attrs(AttrFactory); 5165 bool RequiresArg = false; 5166 if (Tok.is(tok::kw___attribute)) { 5167 ParseGNUAttributes(attrs); 5168 5169 // We require that the argument list (if this is a non-grouping paren) be 5170 // present even if the attribute list was empty. 5171 RequiresArg = true; 5172 } 5173 5174 // Eat any Microsoft extensions. 5175 ParseMicrosoftTypeAttributes(attrs); 5176 5177 // Eat any Borland extensions. 5178 if (Tok.is(tok::kw___pascal)) 5179 ParseBorlandTypeAttributes(attrs); 5180 5181 // If we haven't past the identifier yet (or where the identifier would be 5182 // stored, if this is an abstract declarator), then this is probably just 5183 // grouping parens. However, if this could be an abstract-declarator, then 5184 // this could also be the start of function arguments (consider 'void()'). 5185 bool isGrouping; 5186 5187 if (!D.mayOmitIdentifier()) { 5188 // If this can't be an abstract-declarator, this *must* be a grouping 5189 // paren, because we haven't seen the identifier yet. 5190 isGrouping = true; 5191 } else if (Tok.is(tok::r_paren) || // 'int()' is a function. 5192 (getLangOpts().CPlusPlus && Tok.is(tok::ellipsis) && 5193 NextToken().is(tok::r_paren)) || // C++ int(...) 5194 isDeclarationSpecifier() || // 'int(int)' is a function. 5195 isCXX11AttributeSpecifier()) { // 'int([[]]int)' is a function. 5196 // This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is 5197 // considered to be a type, not a K&R identifier-list. 5198 isGrouping = false; 5199 } else { 5200 // Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'. 5201 isGrouping = true; 5202 } 5203 5204 // If this is a grouping paren, handle: 5205 // direct-declarator: '(' declarator ')' 5206 // direct-declarator: '(' attributes declarator ')' 5207 if (isGrouping) { 5208 SourceLocation EllipsisLoc = D.getEllipsisLoc(); 5209 D.setEllipsisLoc(SourceLocation()); 5210 5211 bool hadGroupingParens = D.hasGroupingParens(); 5212 D.setGroupingParens(true); 5213 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator); 5214 // Match the ')'. 5215 T.consumeClose(); 5216 D.AddTypeInfo(DeclaratorChunk::getParen(T.getOpenLocation(), 5217 T.getCloseLocation()), 5218 attrs, T.getCloseLocation()); 5219 5220 D.setGroupingParens(hadGroupingParens); 5221 5222 // An ellipsis cannot be placed outside parentheses. 5223 if (EllipsisLoc.isValid()) 5224 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D); 5225 5226 return; 5227 } 5228 5229 // Okay, if this wasn't a grouping paren, it must be the start of a function 5230 // argument list. Recognize that this declarator will never have an 5231 // identifier (and remember where it would have been), then call into 5232 // ParseFunctionDeclarator to handle of argument list. 5233 D.SetIdentifier(nullptr, Tok.getLocation()); 5234 5235 // Enter function-declaration scope, limiting any declarators to the 5236 // function prototype scope, including parameter declarators. 5237 ParseScope PrototypeScope(this, 5238 Scope::FunctionPrototypeScope | Scope::DeclScope | 5239 (D.isFunctionDeclaratorAFunctionDeclaration() 5240 ? Scope::FunctionDeclarationScope : 0)); 5241 ParseFunctionDeclarator(D, attrs, T, false, RequiresArg); 5242 PrototypeScope.Exit(); 5243 } 5244 5245 /// ParseFunctionDeclarator - We are after the identifier and have parsed the 5246 /// declarator D up to a paren, which indicates that we are parsing function 5247 /// arguments. 5248 /// 5249 /// If FirstArgAttrs is non-null, then the caller parsed those arguments 5250 /// immediately after the open paren - they should be considered to be the 5251 /// first argument of a parameter. 5252 /// 5253 /// If RequiresArg is true, then the first argument of the function is required 5254 /// to be present and required to not be an identifier list. 5255 /// 5256 /// For C++, after the parameter-list, it also parses the cv-qualifier-seq[opt], 5257 /// (C++11) ref-qualifier[opt], exception-specification[opt], 5258 /// (C++11) attribute-specifier-seq[opt], and (C++11) trailing-return-type[opt]. 5259 /// 5260 /// [C++11] exception-specification: 5261 /// dynamic-exception-specification 5262 /// noexcept-specification 5263 /// 5264 void Parser::ParseFunctionDeclarator(Declarator &D, 5265 ParsedAttributes &FirstArgAttrs, 5266 BalancedDelimiterTracker &Tracker, 5267 bool IsAmbiguous, 5268 bool RequiresArg) { 5269 assert(getCurScope()->isFunctionPrototypeScope() && 5270 "Should call from a Function scope"); 5271 // lparen is already consumed! 5272 assert(D.isPastIdentifier() && "Should not call before identifier!"); 5273 5274 // This should be true when the function has typed arguments. 5275 // Otherwise, it is treated as a K&R-style function. 5276 bool HasProto = false; 5277 // Build up an array of information about the parsed arguments. 5278 SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo; 5279 // Remember where we see an ellipsis, if any. 5280 SourceLocation EllipsisLoc; 5281 5282 DeclSpec DS(AttrFactory); 5283 bool RefQualifierIsLValueRef = true; 5284 SourceLocation RefQualifierLoc; 5285 SourceLocation ConstQualifierLoc; 5286 SourceLocation VolatileQualifierLoc; 5287 SourceLocation RestrictQualifierLoc; 5288 ExceptionSpecificationType ESpecType = EST_None; 5289 SourceRange ESpecRange; 5290 SmallVector<ParsedType, 2> DynamicExceptions; 5291 SmallVector<SourceRange, 2> DynamicExceptionRanges; 5292 ExprResult NoexceptExpr; 5293 CachedTokens *ExceptionSpecTokens = 0; 5294 ParsedAttributes FnAttrs(AttrFactory); 5295 TypeResult TrailingReturnType; 5296 5297 /* LocalEndLoc is the end location for the local FunctionTypeLoc. 5298 EndLoc is the end location for the function declarator. 5299 They differ for trailing return types. */ 5300 SourceLocation StartLoc, LocalEndLoc, EndLoc; 5301 SourceLocation LParenLoc, RParenLoc; 5302 LParenLoc = Tracker.getOpenLocation(); 5303 StartLoc = LParenLoc; 5304 5305 if (isFunctionDeclaratorIdentifierList()) { 5306 if (RequiresArg) 5307 Diag(Tok, diag::err_argument_required_after_attribute); 5308 5309 ParseFunctionDeclaratorIdentifierList(D, ParamInfo); 5310 5311 Tracker.consumeClose(); 5312 RParenLoc = Tracker.getCloseLocation(); 5313 LocalEndLoc = RParenLoc; 5314 EndLoc = RParenLoc; 5315 } else { 5316 if (Tok.isNot(tok::r_paren)) 5317 ParseParameterDeclarationClause(D, FirstArgAttrs, ParamInfo, 5318 EllipsisLoc); 5319 else if (RequiresArg) 5320 Diag(Tok, diag::err_argument_required_after_attribute); 5321 5322 HasProto = ParamInfo.size() || getLangOpts().CPlusPlus; 5323 5324 // If we have the closing ')', eat it. 5325 Tracker.consumeClose(); 5326 RParenLoc = Tracker.getCloseLocation(); 5327 LocalEndLoc = RParenLoc; 5328 EndLoc = RParenLoc; 5329 5330 if (getLangOpts().CPlusPlus) { 5331 // FIXME: Accept these components in any order, and produce fixits to 5332 // correct the order if the user gets it wrong. Ideally we should deal 5333 // with the pure-specifier in the same way. 5334 5335 // Parse cv-qualifier-seq[opt]. 5336 ParseTypeQualifierListOpt(DS, AR_NoAttributesParsed, 5337 /*AtomicAllowed*/ false); 5338 if (!DS.getSourceRange().getEnd().isInvalid()) { 5339 EndLoc = DS.getSourceRange().getEnd(); 5340 ConstQualifierLoc = DS.getConstSpecLoc(); 5341 VolatileQualifierLoc = DS.getVolatileSpecLoc(); 5342 RestrictQualifierLoc = DS.getRestrictSpecLoc(); 5343 } 5344 5345 // Parse ref-qualifier[opt]. 5346 if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc)) 5347 EndLoc = RefQualifierLoc; 5348 5349 // C++11 [expr.prim.general]p3: 5350 // If a declaration declares a member function or member function 5351 // template of a class X, the expression this is a prvalue of type 5352 // "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq 5353 // and the end of the function-definition, member-declarator, or 5354 // declarator. 5355 // FIXME: currently, "static" case isn't handled correctly. 5356 bool IsCXX11MemberFunction = 5357 getLangOpts().CPlusPlus11 && 5358 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5359 (D.getContext() == Declarator::MemberContext 5360 ? !D.getDeclSpec().isFriendSpecified() 5361 : D.getContext() == Declarator::FileContext && 5362 D.getCXXScopeSpec().isValid() && 5363 Actions.CurContext->isRecord()); 5364 Sema::CXXThisScopeRAII ThisScope(Actions, 5365 dyn_cast<CXXRecordDecl>(Actions.CurContext), 5366 DS.getTypeQualifiers() | 5367 (D.getDeclSpec().isConstexprSpecified() && 5368 !getLangOpts().CPlusPlus14 5369 ? Qualifiers::Const : 0), 5370 IsCXX11MemberFunction); 5371 5372 // Parse exception-specification[opt]. 5373 bool Delayed = D.isFirstDeclarationOfMember() && 5374 D.isFunctionDeclaratorAFunctionDeclaration(); 5375 if (Delayed && Actions.isLibstdcxxEagerExceptionSpecHack(D) && 5376 GetLookAheadToken(0).is(tok::kw_noexcept) && 5377 GetLookAheadToken(1).is(tok::l_paren) && 5378 GetLookAheadToken(2).is(tok::kw_noexcept) && 5379 GetLookAheadToken(3).is(tok::l_paren) && 5380 GetLookAheadToken(4).is(tok::identifier) && 5381 GetLookAheadToken(4).getIdentifierInfo()->isStr("swap")) { 5382 // HACK: We've got an exception-specification 5383 // noexcept(noexcept(swap(...))) 5384 // or 5385 // noexcept(noexcept(swap(...)) && noexcept(swap(...))) 5386 // on a 'swap' member function. This is a libstdc++ bug; the lookup 5387 // for 'swap' will only find the function we're currently declaring, 5388 // whereas it expects to find a non-member swap through ADL. Turn off 5389 // delayed parsing to give it a chance to find what it expects. 5390 Delayed = false; 5391 } 5392 ESpecType = tryParseExceptionSpecification(Delayed, 5393 ESpecRange, 5394 DynamicExceptions, 5395 DynamicExceptionRanges, 5396 NoexceptExpr, 5397 ExceptionSpecTokens); 5398 if (ESpecType != EST_None) 5399 EndLoc = ESpecRange.getEnd(); 5400 5401 // Parse attribute-specifier-seq[opt]. Per DR 979 and DR 1297, this goes 5402 // after the exception-specification. 5403 MaybeParseCXX11Attributes(FnAttrs); 5404 5405 // Parse trailing-return-type[opt]. 5406 LocalEndLoc = EndLoc; 5407 if (getLangOpts().CPlusPlus11 && Tok.is(tok::arrow)) { 5408 Diag(Tok, diag::warn_cxx98_compat_trailing_return_type); 5409 if (D.getDeclSpec().getTypeSpecType() == TST_auto) 5410 StartLoc = D.getDeclSpec().getTypeSpecTypeLoc(); 5411 LocalEndLoc = Tok.getLocation(); 5412 SourceRange Range; 5413 TrailingReturnType = ParseTrailingReturnType(Range); 5414 EndLoc = Range.getEnd(); 5415 } 5416 } 5417 } 5418 5419 // Remember that we parsed a function type, and remember the attributes. 5420 D.AddTypeInfo(DeclaratorChunk::getFunction(HasProto, 5421 IsAmbiguous, 5422 LParenLoc, 5423 ParamInfo.data(), ParamInfo.size(), 5424 EllipsisLoc, RParenLoc, 5425 DS.getTypeQualifiers(), 5426 RefQualifierIsLValueRef, 5427 RefQualifierLoc, ConstQualifierLoc, 5428 VolatileQualifierLoc, 5429 RestrictQualifierLoc, 5430 /*MutableLoc=*/SourceLocation(), 5431 ESpecType, ESpecRange.getBegin(), 5432 DynamicExceptions.data(), 5433 DynamicExceptionRanges.data(), 5434 DynamicExceptions.size(), 5435 NoexceptExpr.isUsable() ? 5436 NoexceptExpr.get() : nullptr, 5437 ExceptionSpecTokens, 5438 StartLoc, LocalEndLoc, D, 5439 TrailingReturnType), 5440 FnAttrs, EndLoc); 5441 } 5442 5443 /// ParseRefQualifier - Parses a member function ref-qualifier. Returns 5444 /// true if a ref-qualifier is found. 5445 bool Parser::ParseRefQualifier(bool &RefQualifierIsLValueRef, 5446 SourceLocation &RefQualifierLoc) { 5447 if (Tok.is(tok::amp) || Tok.is(tok::ampamp)) { 5448 Diag(Tok, getLangOpts().CPlusPlus11 ? 5449 diag::warn_cxx98_compat_ref_qualifier : 5450 diag::ext_ref_qualifier); 5451 5452 RefQualifierIsLValueRef = Tok.is(tok::amp); 5453 RefQualifierLoc = ConsumeToken(); 5454 return true; 5455 } 5456 return false; 5457 } 5458 5459 /// isFunctionDeclaratorIdentifierList - This parameter list may have an 5460 /// identifier list form for a K&R-style function: void foo(a,b,c) 5461 /// 5462 /// Note that identifier-lists are only allowed for normal declarators, not for 5463 /// abstract-declarators. 5464 bool Parser::isFunctionDeclaratorIdentifierList() { 5465 return !getLangOpts().CPlusPlus 5466 && Tok.is(tok::identifier) 5467 && !TryAltiVecVectorToken() 5468 // K&R identifier lists can't have typedefs as identifiers, per C99 5469 // 6.7.5.3p11. 5470 && (TryAnnotateTypeOrScopeToken() || !Tok.is(tok::annot_typename)) 5471 // Identifier lists follow a really simple grammar: the identifiers can 5472 // be followed *only* by a ", identifier" or ")". However, K&R 5473 // identifier lists are really rare in the brave new modern world, and 5474 // it is very common for someone to typo a type in a non-K&R style 5475 // list. If we are presented with something like: "void foo(intptr x, 5476 // float y)", we don't want to start parsing the function declarator as 5477 // though it is a K&R style declarator just because intptr is an 5478 // invalid type. 5479 // 5480 // To handle this, we check to see if the token after the first 5481 // identifier is a "," or ")". Only then do we parse it as an 5482 // identifier list. 5483 && (NextToken().is(tok::comma) || NextToken().is(tok::r_paren)); 5484 } 5485 5486 /// ParseFunctionDeclaratorIdentifierList - While parsing a function declarator 5487 /// we found a K&R-style identifier list instead of a typed parameter list. 5488 /// 5489 /// After returning, ParamInfo will hold the parsed parameters. 5490 /// 5491 /// identifier-list: [C99 6.7.5] 5492 /// identifier 5493 /// identifier-list ',' identifier 5494 /// 5495 void Parser::ParseFunctionDeclaratorIdentifierList( 5496 Declarator &D, 5497 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo) { 5498 // If there was no identifier specified for the declarator, either we are in 5499 // an abstract-declarator, or we are in a parameter declarator which was found 5500 // to be abstract. In abstract-declarators, identifier lists are not valid: 5501 // diagnose this. 5502 if (!D.getIdentifier()) 5503 Diag(Tok, diag::ext_ident_list_in_param); 5504 5505 // Maintain an efficient lookup of params we have seen so far. 5506 llvm::SmallSet<const IdentifierInfo*, 16> ParamsSoFar; 5507 5508 do { 5509 // If this isn't an identifier, report the error and skip until ')'. 5510 if (Tok.isNot(tok::identifier)) { 5511 Diag(Tok, diag::err_expected) << tok::identifier; 5512 SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch); 5513 // Forget we parsed anything. 5514 ParamInfo.clear(); 5515 return; 5516 } 5517 5518 IdentifierInfo *ParmII = Tok.getIdentifierInfo(); 5519 5520 // Reject 'typedef int y; int test(x, y)', but continue parsing. 5521 if (Actions.getTypeName(*ParmII, Tok.getLocation(), getCurScope())) 5522 Diag(Tok, diag::err_unexpected_typedef_ident) << ParmII; 5523 5524 // Verify that the argument identifier has not already been mentioned. 5525 if (!ParamsSoFar.insert(ParmII).second) { 5526 Diag(Tok, diag::err_param_redefinition) << ParmII; 5527 } else { 5528 // Remember this identifier in ParamInfo. 5529 ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII, 5530 Tok.getLocation(), 5531 nullptr)); 5532 } 5533 5534 // Eat the identifier. 5535 ConsumeToken(); 5536 // The list continues if we see a comma. 5537 } while (TryConsumeToken(tok::comma)); 5538 } 5539 5540 /// ParseParameterDeclarationClause - Parse a (possibly empty) parameter-list 5541 /// after the opening parenthesis. This function will not parse a K&R-style 5542 /// identifier list. 5543 /// 5544 /// D is the declarator being parsed. If FirstArgAttrs is non-null, then the 5545 /// caller parsed those arguments immediately after the open paren - they should 5546 /// be considered to be part of the first parameter. 5547 /// 5548 /// After returning, ParamInfo will hold the parsed parameters. EllipsisLoc will 5549 /// be the location of the ellipsis, if any was parsed. 5550 /// 5551 /// parameter-type-list: [C99 6.7.5] 5552 /// parameter-list 5553 /// parameter-list ',' '...' 5554 /// [C++] parameter-list '...' 5555 /// 5556 /// parameter-list: [C99 6.7.5] 5557 /// parameter-declaration 5558 /// parameter-list ',' parameter-declaration 5559 /// 5560 /// parameter-declaration: [C99 6.7.5] 5561 /// declaration-specifiers declarator 5562 /// [C++] declaration-specifiers declarator '=' assignment-expression 5563 /// [C++11] initializer-clause 5564 /// [GNU] declaration-specifiers declarator attributes 5565 /// declaration-specifiers abstract-declarator[opt] 5566 /// [C++] declaration-specifiers abstract-declarator[opt] 5567 /// '=' assignment-expression 5568 /// [GNU] declaration-specifiers abstract-declarator[opt] attributes 5569 /// [C++11] attribute-specifier-seq parameter-declaration 5570 /// 5571 void Parser::ParseParameterDeclarationClause( 5572 Declarator &D, 5573 ParsedAttributes &FirstArgAttrs, 5574 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo, 5575 SourceLocation &EllipsisLoc) { 5576 do { 5577 // FIXME: Issue a diagnostic if we parsed an attribute-specifier-seq 5578 // before deciding this was a parameter-declaration-clause. 5579 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) 5580 break; 5581 5582 // Parse the declaration-specifiers. 5583 // Just use the ParsingDeclaration "scope" of the declarator. 5584 DeclSpec DS(AttrFactory); 5585 5586 // Parse any C++11 attributes. 5587 MaybeParseCXX11Attributes(DS.getAttributes()); 5588 5589 // Skip any Microsoft attributes before a param. 5590 MaybeParseMicrosoftAttributes(DS.getAttributes()); 5591 5592 SourceLocation DSStart = Tok.getLocation(); 5593 5594 // If the caller parsed attributes for the first argument, add them now. 5595 // Take them so that we only apply the attributes to the first parameter. 5596 // FIXME: If we can leave the attributes in the token stream somehow, we can 5597 // get rid of a parameter (FirstArgAttrs) and this statement. It might be 5598 // too much hassle. 5599 DS.takeAttributesFrom(FirstArgAttrs); 5600 5601 ParseDeclarationSpecifiers(DS); 5602 5603 5604 // Parse the declarator. This is "PrototypeContext" or 5605 // "LambdaExprParameterContext", because we must accept either 5606 // 'declarator' or 'abstract-declarator' here. 5607 Declarator ParmDeclarator(DS, 5608 D.getContext() == Declarator::LambdaExprContext ? 5609 Declarator::LambdaExprParameterContext : 5610 Declarator::PrototypeContext); 5611 ParseDeclarator(ParmDeclarator); 5612 5613 // Parse GNU attributes, if present. 5614 MaybeParseGNUAttributes(ParmDeclarator); 5615 5616 // Remember this parsed parameter in ParamInfo. 5617 IdentifierInfo *ParmII = ParmDeclarator.getIdentifier(); 5618 5619 // DefArgToks is used when the parsing of default arguments needs 5620 // to be delayed. 5621 CachedTokens *DefArgToks = nullptr; 5622 5623 // If no parameter was specified, verify that *something* was specified, 5624 // otherwise we have a missing type and identifier. 5625 if (DS.isEmpty() && ParmDeclarator.getIdentifier() == nullptr && 5626 ParmDeclarator.getNumTypeObjects() == 0) { 5627 // Completely missing, emit error. 5628 Diag(DSStart, diag::err_missing_param); 5629 } else { 5630 // Otherwise, we have something. Add it and let semantic analysis try 5631 // to grok it and add the result to the ParamInfo we are building. 5632 5633 // Last chance to recover from a misplaced ellipsis in an attempted 5634 // parameter pack declaration. 5635 if (Tok.is(tok::ellipsis) && 5636 (NextToken().isNot(tok::r_paren) || 5637 (!ParmDeclarator.getEllipsisLoc().isValid() && 5638 !Actions.isUnexpandedParameterPackPermitted())) && 5639 Actions.containsUnexpandedParameterPacks(ParmDeclarator)) 5640 DiagnoseMisplacedEllipsisInDeclarator(ConsumeToken(), ParmDeclarator); 5641 5642 // Inform the actions module about the parameter declarator, so it gets 5643 // added to the current scope. 5644 Decl *Param = Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator); 5645 // Parse the default argument, if any. We parse the default 5646 // arguments in all dialects; the semantic analysis in 5647 // ActOnParamDefaultArgument will reject the default argument in 5648 // C. 5649 if (Tok.is(tok::equal)) { 5650 SourceLocation EqualLoc = Tok.getLocation(); 5651 5652 // Parse the default argument 5653 if (D.getContext() == Declarator::MemberContext) { 5654 // If we're inside a class definition, cache the tokens 5655 // corresponding to the default argument. We'll actually parse 5656 // them when we see the end of the class definition. 5657 // FIXME: Can we use a smart pointer for Toks? 5658 DefArgToks = new CachedTokens; 5659 5660 SourceLocation ArgStartLoc = NextToken().getLocation(); 5661 if (!ConsumeAndStoreInitializer(*DefArgToks, CIK_DefaultArgument)) { 5662 delete DefArgToks; 5663 DefArgToks = nullptr; 5664 Actions.ActOnParamDefaultArgumentError(Param, EqualLoc); 5665 } else { 5666 Actions.ActOnParamUnparsedDefaultArgument(Param, EqualLoc, 5667 ArgStartLoc); 5668 } 5669 } else { 5670 // Consume the '='. 5671 ConsumeToken(); 5672 5673 // The argument isn't actually potentially evaluated unless it is 5674 // used. 5675 EnterExpressionEvaluationContext Eval(Actions, 5676 Sema::PotentiallyEvaluatedIfUsed, 5677 Param); 5678 5679 ExprResult DefArgResult; 5680 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 5681 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 5682 DefArgResult = ParseBraceInitializer(); 5683 } else 5684 DefArgResult = ParseAssignmentExpression(); 5685 DefArgResult = Actions.CorrectDelayedTyposInExpr(DefArgResult); 5686 if (DefArgResult.isInvalid()) { 5687 Actions.ActOnParamDefaultArgumentError(Param, EqualLoc); 5688 SkipUntil(tok::comma, tok::r_paren, StopAtSemi | StopBeforeMatch); 5689 } else { 5690 // Inform the actions module about the default argument 5691 Actions.ActOnParamDefaultArgument(Param, EqualLoc, 5692 DefArgResult.get()); 5693 } 5694 } 5695 } 5696 5697 ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII, 5698 ParmDeclarator.getIdentifierLoc(), 5699 Param, DefArgToks)); 5700 } 5701 5702 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) { 5703 if (!getLangOpts().CPlusPlus) { 5704 // We have ellipsis without a preceding ',', which is ill-formed 5705 // in C. Complain and provide the fix. 5706 Diag(EllipsisLoc, diag::err_missing_comma_before_ellipsis) 5707 << FixItHint::CreateInsertion(EllipsisLoc, ", "); 5708 } else if (ParmDeclarator.getEllipsisLoc().isValid() || 5709 Actions.containsUnexpandedParameterPacks(ParmDeclarator)) { 5710 // It looks like this was supposed to be a parameter pack. Warn and 5711 // point out where the ellipsis should have gone. 5712 SourceLocation ParmEllipsis = ParmDeclarator.getEllipsisLoc(); 5713 Diag(EllipsisLoc, diag::warn_misplaced_ellipsis_vararg) 5714 << ParmEllipsis.isValid() << ParmEllipsis; 5715 if (ParmEllipsis.isValid()) { 5716 Diag(ParmEllipsis, 5717 diag::note_misplaced_ellipsis_vararg_existing_ellipsis); 5718 } else { 5719 Diag(ParmDeclarator.getIdentifierLoc(), 5720 diag::note_misplaced_ellipsis_vararg_add_ellipsis) 5721 << FixItHint::CreateInsertion(ParmDeclarator.getIdentifierLoc(), 5722 "...") 5723 << !ParmDeclarator.hasName(); 5724 } 5725 Diag(EllipsisLoc, diag::note_misplaced_ellipsis_vararg_add_comma) 5726 << FixItHint::CreateInsertion(EllipsisLoc, ", "); 5727 } 5728 5729 // We can't have any more parameters after an ellipsis. 5730 break; 5731 } 5732 5733 // If the next token is a comma, consume it and keep reading arguments. 5734 } while (TryConsumeToken(tok::comma)); 5735 } 5736 5737 /// [C90] direct-declarator '[' constant-expression[opt] ']' 5738 /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']' 5739 /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']' 5740 /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']' 5741 /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']' 5742 /// [C++11] direct-declarator '[' constant-expression[opt] ']' 5743 /// attribute-specifier-seq[opt] 5744 void Parser::ParseBracketDeclarator(Declarator &D) { 5745 if (CheckProhibitedCXX11Attribute()) 5746 return; 5747 5748 BalancedDelimiterTracker T(*this, tok::l_square); 5749 T.consumeOpen(); 5750 5751 // C array syntax has many features, but by-far the most common is [] and [4]. 5752 // This code does a fast path to handle some of the most obvious cases. 5753 if (Tok.getKind() == tok::r_square) { 5754 T.consumeClose(); 5755 ParsedAttributes attrs(AttrFactory); 5756 MaybeParseCXX11Attributes(attrs); 5757 5758 // Remember that we parsed the empty array type. 5759 D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, nullptr, 5760 T.getOpenLocation(), 5761 T.getCloseLocation()), 5762 attrs, T.getCloseLocation()); 5763 return; 5764 } else if (Tok.getKind() == tok::numeric_constant && 5765 GetLookAheadToken(1).is(tok::r_square)) { 5766 // [4] is very common. Parse the numeric constant expression. 5767 ExprResult ExprRes(Actions.ActOnNumericConstant(Tok, getCurScope())); 5768 ConsumeToken(); 5769 5770 T.consumeClose(); 5771 ParsedAttributes attrs(AttrFactory); 5772 MaybeParseCXX11Attributes(attrs); 5773 5774 // Remember that we parsed a array type, and remember its features. 5775 D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, 5776 ExprRes.get(), 5777 T.getOpenLocation(), 5778 T.getCloseLocation()), 5779 attrs, T.getCloseLocation()); 5780 return; 5781 } 5782 5783 // If valid, this location is the position where we read the 'static' keyword. 5784 SourceLocation StaticLoc; 5785 TryConsumeToken(tok::kw_static, StaticLoc); 5786 5787 // If there is a type-qualifier-list, read it now. 5788 // Type qualifiers in an array subscript are a C99 feature. 5789 DeclSpec DS(AttrFactory); 5790 ParseTypeQualifierListOpt(DS, AR_CXX11AttributesParsed); 5791 5792 // If we haven't already read 'static', check to see if there is one after the 5793 // type-qualifier-list. 5794 if (!StaticLoc.isValid()) 5795 TryConsumeToken(tok::kw_static, StaticLoc); 5796 5797 // Handle "direct-declarator [ type-qual-list[opt] * ]". 5798 bool isStar = false; 5799 ExprResult NumElements; 5800 5801 // Handle the case where we have '[*]' as the array size. However, a leading 5802 // star could be the start of an expression, for example 'X[*p + 4]'. Verify 5803 // the token after the star is a ']'. Since stars in arrays are 5804 // infrequent, use of lookahead is not costly here. 5805 if (Tok.is(tok::star) && GetLookAheadToken(1).is(tok::r_square)) { 5806 ConsumeToken(); // Eat the '*'. 5807 5808 if (StaticLoc.isValid()) { 5809 Diag(StaticLoc, diag::err_unspecified_vla_size_with_static); 5810 StaticLoc = SourceLocation(); // Drop the static. 5811 } 5812 isStar = true; 5813 } else if (Tok.isNot(tok::r_square)) { 5814 // Note, in C89, this production uses the constant-expr production instead 5815 // of assignment-expr. The only difference is that assignment-expr allows 5816 // things like '=' and '*='. Sema rejects these in C89 mode because they 5817 // are not i-c-e's, so we don't need to distinguish between the two here. 5818 5819 // Parse the constant-expression or assignment-expression now (depending 5820 // on dialect). 5821 if (getLangOpts().CPlusPlus) { 5822 NumElements = ParseConstantExpression(); 5823 } else { 5824 EnterExpressionEvaluationContext Unevaluated(Actions, 5825 Sema::ConstantEvaluated); 5826 NumElements = 5827 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()); 5828 } 5829 } else { 5830 if (StaticLoc.isValid()) { 5831 Diag(StaticLoc, diag::err_unspecified_size_with_static); 5832 StaticLoc = SourceLocation(); // Drop the static. 5833 } 5834 } 5835 5836 // If there was an error parsing the assignment-expression, recover. 5837 if (NumElements.isInvalid()) { 5838 D.setInvalidType(true); 5839 // If the expression was invalid, skip it. 5840 SkipUntil(tok::r_square, StopAtSemi); 5841 return; 5842 } 5843 5844 T.consumeClose(); 5845 5846 ParsedAttributes attrs(AttrFactory); 5847 MaybeParseCXX11Attributes(attrs); 5848 5849 // Remember that we parsed a array type, and remember its features. 5850 D.AddTypeInfo(DeclaratorChunk::getArray(DS.getTypeQualifiers(), 5851 StaticLoc.isValid(), isStar, 5852 NumElements.get(), 5853 T.getOpenLocation(), 5854 T.getCloseLocation()), 5855 attrs, T.getCloseLocation()); 5856 } 5857 5858 /// Diagnose brackets before an identifier. 5859 void Parser::ParseMisplacedBracketDeclarator(Declarator &D) { 5860 assert(Tok.is(tok::l_square) && "Missing opening bracket"); 5861 assert(!D.mayOmitIdentifier() && "Declarator cannot omit identifier"); 5862 5863 SourceLocation StartBracketLoc = Tok.getLocation(); 5864 Declarator TempDeclarator(D.getDeclSpec(), D.getContext()); 5865 5866 while (Tok.is(tok::l_square)) { 5867 ParseBracketDeclarator(TempDeclarator); 5868 } 5869 5870 // Stuff the location of the start of the brackets into the Declarator. 5871 // The diagnostics from ParseDirectDeclarator will make more sense if 5872 // they use this location instead. 5873 if (Tok.is(tok::semi)) 5874 D.getName().EndLocation = StartBracketLoc; 5875 5876 SourceLocation SuggestParenLoc = Tok.getLocation(); 5877 5878 // Now that the brackets are removed, try parsing the declarator again. 5879 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator); 5880 5881 // Something went wrong parsing the brackets, in which case, 5882 // ParseBracketDeclarator has emitted an error, and we don't need to emit 5883 // one here. 5884 if (TempDeclarator.getNumTypeObjects() == 0) 5885 return; 5886 5887 // Determine if parens will need to be suggested in the diagnostic. 5888 bool NeedParens = false; 5889 if (D.getNumTypeObjects() != 0) { 5890 switch (D.getTypeObject(D.getNumTypeObjects() - 1).Kind) { 5891 case DeclaratorChunk::Pointer: 5892 case DeclaratorChunk::Reference: 5893 case DeclaratorChunk::BlockPointer: 5894 case DeclaratorChunk::MemberPointer: 5895 NeedParens = true; 5896 break; 5897 case DeclaratorChunk::Array: 5898 case DeclaratorChunk::Function: 5899 case DeclaratorChunk::Paren: 5900 break; 5901 } 5902 } 5903 5904 if (NeedParens) { 5905 // Create a DeclaratorChunk for the inserted parens. 5906 ParsedAttributes attrs(AttrFactory); 5907 SourceLocation EndLoc = PP.getLocForEndOfToken(D.getLocEnd()); 5908 D.AddTypeInfo(DeclaratorChunk::getParen(SuggestParenLoc, EndLoc), attrs, 5909 SourceLocation()); 5910 } 5911 5912 // Adding back the bracket info to the end of the Declarator. 5913 for (unsigned i = 0, e = TempDeclarator.getNumTypeObjects(); i < e; ++i) { 5914 const DeclaratorChunk &Chunk = TempDeclarator.getTypeObject(i); 5915 ParsedAttributes attrs(AttrFactory); 5916 attrs.set(Chunk.Common.AttrList); 5917 D.AddTypeInfo(Chunk, attrs, SourceLocation()); 5918 } 5919 5920 // The missing identifier would have been diagnosed in ParseDirectDeclarator. 5921 // If parentheses are required, always suggest them. 5922 if (!D.getIdentifier() && !NeedParens) 5923 return; 5924 5925 SourceLocation EndBracketLoc = TempDeclarator.getLocEnd(); 5926 5927 // Generate the move bracket error message. 5928 SourceRange BracketRange(StartBracketLoc, EndBracketLoc); 5929 SourceLocation EndLoc = PP.getLocForEndOfToken(D.getLocEnd()); 5930 5931 if (NeedParens) { 5932 Diag(EndLoc, diag::err_brackets_go_after_unqualified_id) 5933 << getLangOpts().CPlusPlus 5934 << FixItHint::CreateInsertion(SuggestParenLoc, "(") 5935 << FixItHint::CreateInsertion(EndLoc, ")") 5936 << FixItHint::CreateInsertionFromRange( 5937 EndLoc, CharSourceRange(BracketRange, true)) 5938 << FixItHint::CreateRemoval(BracketRange); 5939 } else { 5940 Diag(EndLoc, diag::err_brackets_go_after_unqualified_id) 5941 << getLangOpts().CPlusPlus 5942 << FixItHint::CreateInsertionFromRange( 5943 EndLoc, CharSourceRange(BracketRange, true)) 5944 << FixItHint::CreateRemoval(BracketRange); 5945 } 5946 } 5947 5948 /// [GNU] typeof-specifier: 5949 /// typeof ( expressions ) 5950 /// typeof ( type-name ) 5951 /// [GNU/C++] typeof unary-expression 5952 /// 5953 void Parser::ParseTypeofSpecifier(DeclSpec &DS) { 5954 assert(Tok.is(tok::kw_typeof) && "Not a typeof specifier"); 5955 Token OpTok = Tok; 5956 SourceLocation StartLoc = ConsumeToken(); 5957 5958 const bool hasParens = Tok.is(tok::l_paren); 5959 5960 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 5961 Sema::ReuseLambdaContextDecl); 5962 5963 bool isCastExpr; 5964 ParsedType CastTy; 5965 SourceRange CastRange; 5966 ExprResult Operand = Actions.CorrectDelayedTyposInExpr( 5967 ParseExprAfterUnaryExprOrTypeTrait(OpTok, isCastExpr, CastTy, CastRange)); 5968 if (hasParens) 5969 DS.setTypeofParensRange(CastRange); 5970 5971 if (CastRange.getEnd().isInvalid()) 5972 // FIXME: Not accurate, the range gets one token more than it should. 5973 DS.SetRangeEnd(Tok.getLocation()); 5974 else 5975 DS.SetRangeEnd(CastRange.getEnd()); 5976 5977 if (isCastExpr) { 5978 if (!CastTy) { 5979 DS.SetTypeSpecError(); 5980 return; 5981 } 5982 5983 const char *PrevSpec = nullptr; 5984 unsigned DiagID; 5985 // Check for duplicate type specifiers (e.g. "int typeof(int)"). 5986 if (DS.SetTypeSpecType(DeclSpec::TST_typeofType, StartLoc, PrevSpec, 5987 DiagID, CastTy, 5988 Actions.getASTContext().getPrintingPolicy())) 5989 Diag(StartLoc, DiagID) << PrevSpec; 5990 return; 5991 } 5992 5993 // If we get here, the operand to the typeof was an expresion. 5994 if (Operand.isInvalid()) { 5995 DS.SetTypeSpecError(); 5996 return; 5997 } 5998 5999 // We might need to transform the operand if it is potentially evaluated. 6000 Operand = Actions.HandleExprEvaluationContextForTypeof(Operand.get()); 6001 if (Operand.isInvalid()) { 6002 DS.SetTypeSpecError(); 6003 return; 6004 } 6005 6006 const char *PrevSpec = nullptr; 6007 unsigned DiagID; 6008 // Check for duplicate type specifiers (e.g. "int typeof(int)"). 6009 if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec, 6010 DiagID, Operand.get(), 6011 Actions.getASTContext().getPrintingPolicy())) 6012 Diag(StartLoc, DiagID) << PrevSpec; 6013 } 6014 6015 /// [C11] atomic-specifier: 6016 /// _Atomic ( type-name ) 6017 /// 6018 void Parser::ParseAtomicSpecifier(DeclSpec &DS) { 6019 assert(Tok.is(tok::kw__Atomic) && NextToken().is(tok::l_paren) && 6020 "Not an atomic specifier"); 6021 6022 SourceLocation StartLoc = ConsumeToken(); 6023 BalancedDelimiterTracker T(*this, tok::l_paren); 6024 if (T.consumeOpen()) 6025 return; 6026 6027 TypeResult Result = ParseTypeName(); 6028 if (Result.isInvalid()) { 6029 SkipUntil(tok::r_paren, StopAtSemi); 6030 return; 6031 } 6032 6033 // Match the ')' 6034 T.consumeClose(); 6035 6036 if (T.getCloseLocation().isInvalid()) 6037 return; 6038 6039 DS.setTypeofParensRange(T.getRange()); 6040 DS.SetRangeEnd(T.getCloseLocation()); 6041 6042 const char *PrevSpec = nullptr; 6043 unsigned DiagID; 6044 if (DS.SetTypeSpecType(DeclSpec::TST_atomic, StartLoc, PrevSpec, 6045 DiagID, Result.get(), 6046 Actions.getASTContext().getPrintingPolicy())) 6047 Diag(StartLoc, DiagID) << PrevSpec; 6048 } 6049 6050 6051 /// TryAltiVecVectorTokenOutOfLine - Out of line body that should only be called 6052 /// from TryAltiVecVectorToken. 6053 bool Parser::TryAltiVecVectorTokenOutOfLine() { 6054 Token Next = NextToken(); 6055 switch (Next.getKind()) { 6056 default: return false; 6057 case tok::kw_short: 6058 case tok::kw_long: 6059 case tok::kw_signed: 6060 case tok::kw_unsigned: 6061 case tok::kw_void: 6062 case tok::kw_char: 6063 case tok::kw_int: 6064 case tok::kw_float: 6065 case tok::kw_double: 6066 case tok::kw_bool: 6067 case tok::kw___bool: 6068 case tok::kw___pixel: 6069 Tok.setKind(tok::kw___vector); 6070 return true; 6071 case tok::identifier: 6072 if (Next.getIdentifierInfo() == Ident_pixel) { 6073 Tok.setKind(tok::kw___vector); 6074 return true; 6075 } 6076 if (Next.getIdentifierInfo() == Ident_bool) { 6077 Tok.setKind(tok::kw___vector); 6078 return true; 6079 } 6080 return false; 6081 } 6082 } 6083 6084 bool Parser::TryAltiVecTokenOutOfLine(DeclSpec &DS, SourceLocation Loc, 6085 const char *&PrevSpec, unsigned &DiagID, 6086 bool &isInvalid) { 6087 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy(); 6088 if (Tok.getIdentifierInfo() == Ident_vector) { 6089 Token Next = NextToken(); 6090 switch (Next.getKind()) { 6091 case tok::kw_short: 6092 case tok::kw_long: 6093 case tok::kw_signed: 6094 case tok::kw_unsigned: 6095 case tok::kw_void: 6096 case tok::kw_char: 6097 case tok::kw_int: 6098 case tok::kw_float: 6099 case tok::kw_double: 6100 case tok::kw_bool: 6101 case tok::kw___bool: 6102 case tok::kw___pixel: 6103 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID, Policy); 6104 return true; 6105 case tok::identifier: 6106 if (Next.getIdentifierInfo() == Ident_pixel) { 6107 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID,Policy); 6108 return true; 6109 } 6110 if (Next.getIdentifierInfo() == Ident_bool) { 6111 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID,Policy); 6112 return true; 6113 } 6114 break; 6115 default: 6116 break; 6117 } 6118 } else if ((Tok.getIdentifierInfo() == Ident_pixel) && 6119 DS.isTypeAltiVecVector()) { 6120 isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID, Policy); 6121 return true; 6122 } else if ((Tok.getIdentifierInfo() == Ident_bool) && 6123 DS.isTypeAltiVecVector()) { 6124 isInvalid = DS.SetTypeAltiVecBool(true, Loc, PrevSpec, DiagID, Policy); 6125 return true; 6126 } 6127 return false; 6128 } 6129