ParseExprCXX.cpp revision 29e3a31b7cbd9f9cdf2cc857a3a805871b6f3f62
1//===--- ParseExprCXX.cpp - C++ Expression 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 Expression parsing implementation for C++. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Parse/ParseDiagnostic.h" 15#include "clang/Parse/Parser.h" 16#include "RAIIObjectsForParser.h" 17#include "clang/Sema/DeclSpec.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ParsedTemplate.h" 20#include "llvm/Support/ErrorHandling.h" 21 22using namespace clang; 23 24static int SelectDigraphErrorMessage(tok::TokenKind Kind) { 25 switch (Kind) { 26 case tok::kw_template: return 0; 27 case tok::kw_const_cast: return 1; 28 case tok::kw_dynamic_cast: return 2; 29 case tok::kw_reinterpret_cast: return 3; 30 case tok::kw_static_cast: return 4; 31 default: 32 llvm_unreachable("Unknown type for digraph error message."); 33 } 34} 35 36// Are the two tokens adjacent in the same source file? 37static bool AreTokensAdjacent(Preprocessor &PP, Token &First, Token &Second) { 38 SourceManager &SM = PP.getSourceManager(); 39 SourceLocation FirstLoc = SM.getSpellingLoc(First.getLocation()); 40 SourceLocation FirstEnd = FirstLoc.getLocWithOffset(First.getLength()); 41 return FirstEnd == SM.getSpellingLoc(Second.getLocation()); 42} 43 44// Suggest fixit for "<::" after a cast. 45static void FixDigraph(Parser &P, Preprocessor &PP, Token &DigraphToken, 46 Token &ColonToken, tok::TokenKind Kind, bool AtDigraph) { 47 // Pull '<:' and ':' off token stream. 48 if (!AtDigraph) 49 PP.Lex(DigraphToken); 50 PP.Lex(ColonToken); 51 52 SourceRange Range; 53 Range.setBegin(DigraphToken.getLocation()); 54 Range.setEnd(ColonToken.getLocation()); 55 P.Diag(DigraphToken.getLocation(), diag::err_missing_whitespace_digraph) 56 << SelectDigraphErrorMessage(Kind) 57 << FixItHint::CreateReplacement(Range, "< ::"); 58 59 // Update token information to reflect their change in token type. 60 ColonToken.setKind(tok::coloncolon); 61 ColonToken.setLocation(ColonToken.getLocation().getLocWithOffset(-1)); 62 ColonToken.setLength(2); 63 DigraphToken.setKind(tok::less); 64 DigraphToken.setLength(1); 65 66 // Push new tokens back to token stream. 67 PP.EnterToken(ColonToken); 68 if (!AtDigraph) 69 PP.EnterToken(DigraphToken); 70} 71 72// Check for '<::' which should be '< ::' instead of '[:' when following 73// a template name. 74void Parser::CheckForTemplateAndDigraph(Token &Next, ParsedType ObjectType, 75 bool EnteringContext, 76 IdentifierInfo &II, CXXScopeSpec &SS) { 77 if (!Next.is(tok::l_square) || Next.getLength() != 2) 78 return; 79 80 Token SecondToken = GetLookAheadToken(2); 81 if (!SecondToken.is(tok::colon) || !AreTokensAdjacent(PP, Next, SecondToken)) 82 return; 83 84 TemplateTy Template; 85 UnqualifiedId TemplateName; 86 TemplateName.setIdentifier(&II, Tok.getLocation()); 87 bool MemberOfUnknownSpecialization; 88 if (!Actions.isTemplateName(getCurScope(), SS, /*hasTemplateKeyword=*/false, 89 TemplateName, ObjectType, EnteringContext, 90 Template, MemberOfUnknownSpecialization)) 91 return; 92 93 FixDigraph(*this, PP, Next, SecondToken, tok::kw_template, 94 /*AtDigraph*/false); 95} 96 97/// \brief Parse global scope or nested-name-specifier if present. 98/// 99/// Parses a C++ global scope specifier ('::') or nested-name-specifier (which 100/// may be preceded by '::'). Note that this routine will not parse ::new or 101/// ::delete; it will just leave them in the token stream. 102/// 103/// '::'[opt] nested-name-specifier 104/// '::' 105/// 106/// nested-name-specifier: 107/// type-name '::' 108/// namespace-name '::' 109/// nested-name-specifier identifier '::' 110/// nested-name-specifier 'template'[opt] simple-template-id '::' 111/// 112/// 113/// \param SS the scope specifier that will be set to the parsed 114/// nested-name-specifier (or empty) 115/// 116/// \param ObjectType if this nested-name-specifier is being parsed following 117/// the "." or "->" of a member access expression, this parameter provides the 118/// type of the object whose members are being accessed. 119/// 120/// \param EnteringContext whether we will be entering into the context of 121/// the nested-name-specifier after parsing it. 122/// 123/// \param MayBePseudoDestructor When non-NULL, points to a flag that 124/// indicates whether this nested-name-specifier may be part of a 125/// pseudo-destructor name. In this case, the flag will be set false 126/// if we don't actually end up parsing a destructor name. Moreorover, 127/// if we do end up determining that we are parsing a destructor name, 128/// the last component of the nested-name-specifier is not parsed as 129/// part of the scope specifier. 130 131/// member access expression, e.g., the \p T:: in \p p->T::m. 132/// 133/// \returns true if there was an error parsing a scope specifier 134bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS, 135 ParsedType ObjectType, 136 bool EnteringContext, 137 bool *MayBePseudoDestructor, 138 bool IsTypename) { 139 assert(getLang().CPlusPlus && 140 "Call sites of this function should be guarded by checking for C++"); 141 142 if (Tok.is(tok::annot_cxxscope)) { 143 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(), 144 Tok.getAnnotationRange(), 145 SS); 146 ConsumeToken(); 147 return false; 148 } 149 150 bool HasScopeSpecifier = false; 151 152 if (Tok.is(tok::coloncolon)) { 153 // ::new and ::delete aren't nested-name-specifiers. 154 tok::TokenKind NextKind = NextToken().getKind(); 155 if (NextKind == tok::kw_new || NextKind == tok::kw_delete) 156 return false; 157 158 // '::' - Global scope qualifier. 159 if (Actions.ActOnCXXGlobalScopeSpecifier(getCurScope(), ConsumeToken(), SS)) 160 return true; 161 162 HasScopeSpecifier = true; 163 } 164 165 bool CheckForDestructor = false; 166 if (MayBePseudoDestructor && *MayBePseudoDestructor) { 167 CheckForDestructor = true; 168 *MayBePseudoDestructor = false; 169 } 170 171 while (true) { 172 if (HasScopeSpecifier) { 173 // C++ [basic.lookup.classref]p5: 174 // If the qualified-id has the form 175 // 176 // ::class-name-or-namespace-name::... 177 // 178 // the class-name-or-namespace-name is looked up in global scope as a 179 // class-name or namespace-name. 180 // 181 // To implement this, we clear out the object type as soon as we've 182 // seen a leading '::' or part of a nested-name-specifier. 183 ObjectType = ParsedType(); 184 185 if (Tok.is(tok::code_completion)) { 186 // Code completion for a nested-name-specifier, where the code 187 // code completion token follows the '::'. 188 Actions.CodeCompleteQualifiedId(getCurScope(), SS, EnteringContext); 189 // Include code completion token into the range of the scope otherwise 190 // when we try to annotate the scope tokens the dangling code completion 191 // token will cause assertion in 192 // Preprocessor::AnnotatePreviousCachedTokens. 193 SS.setEndLoc(Tok.getLocation()); 194 cutOffParsing(); 195 return true; 196 } 197 } 198 199 // nested-name-specifier: 200 // nested-name-specifier 'template'[opt] simple-template-id '::' 201 202 // Parse the optional 'template' keyword, then make sure we have 203 // 'identifier <' after it. 204 if (Tok.is(tok::kw_template)) { 205 // If we don't have a scope specifier or an object type, this isn't a 206 // nested-name-specifier, since they aren't allowed to start with 207 // 'template'. 208 if (!HasScopeSpecifier && !ObjectType) 209 break; 210 211 TentativeParsingAction TPA(*this); 212 SourceLocation TemplateKWLoc = ConsumeToken(); 213 214 UnqualifiedId TemplateName; 215 if (Tok.is(tok::identifier)) { 216 // Consume the identifier. 217 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 218 ConsumeToken(); 219 } else if (Tok.is(tok::kw_operator)) { 220 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, 221 TemplateName)) { 222 TPA.Commit(); 223 break; 224 } 225 226 if (TemplateName.getKind() != UnqualifiedId::IK_OperatorFunctionId && 227 TemplateName.getKind() != UnqualifiedId::IK_LiteralOperatorId) { 228 Diag(TemplateName.getSourceRange().getBegin(), 229 diag::err_id_after_template_in_nested_name_spec) 230 << TemplateName.getSourceRange(); 231 TPA.Commit(); 232 break; 233 } 234 } else { 235 TPA.Revert(); 236 break; 237 } 238 239 // If the next token is not '<', we have a qualified-id that refers 240 // to a template name, such as T::template apply, but is not a 241 // template-id. 242 if (Tok.isNot(tok::less)) { 243 TPA.Revert(); 244 break; 245 } 246 247 // Commit to parsing the template-id. 248 TPA.Commit(); 249 TemplateTy Template; 250 if (TemplateNameKind TNK = Actions.ActOnDependentTemplateName(getCurScope(), 251 TemplateKWLoc, 252 SS, 253 TemplateName, 254 ObjectType, 255 EnteringContext, 256 Template)) { 257 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 258 TemplateKWLoc, false)) 259 return true; 260 } else 261 return true; 262 263 continue; 264 } 265 266 if (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) { 267 // We have 268 // 269 // simple-template-id '::' 270 // 271 // So we need to check whether the simple-template-id is of the 272 // right kind (it should name a type or be dependent), and then 273 // convert it into a type within the nested-name-specifier. 274 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 275 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde)) { 276 *MayBePseudoDestructor = true; 277 return false; 278 } 279 280 // Consume the template-id token. 281 ConsumeToken(); 282 283 assert(Tok.is(tok::coloncolon) && "NextToken() not working properly!"); 284 SourceLocation CCLoc = ConsumeToken(); 285 286 if (!HasScopeSpecifier) 287 HasScopeSpecifier = true; 288 289 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 290 TemplateId->getTemplateArgs(), 291 TemplateId->NumArgs); 292 293 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(), 294 /*FIXME:*/SourceLocation(), 295 SS, 296 TemplateId->Template, 297 TemplateId->TemplateNameLoc, 298 TemplateId->LAngleLoc, 299 TemplateArgsPtr, 300 TemplateId->RAngleLoc, 301 CCLoc, 302 EnteringContext)) { 303 SourceLocation StartLoc 304 = SS.getBeginLoc().isValid()? SS.getBeginLoc() 305 : TemplateId->TemplateNameLoc; 306 SS.SetInvalid(SourceRange(StartLoc, CCLoc)); 307 } 308 309 continue; 310 } 311 312 313 // The rest of the nested-name-specifier possibilities start with 314 // tok::identifier. 315 if (Tok.isNot(tok::identifier)) 316 break; 317 318 IdentifierInfo &II = *Tok.getIdentifierInfo(); 319 320 // nested-name-specifier: 321 // type-name '::' 322 // namespace-name '::' 323 // nested-name-specifier identifier '::' 324 Token Next = NextToken(); 325 326 // If we get foo:bar, this is almost certainly a typo for foo::bar. Recover 327 // and emit a fixit hint for it. 328 if (Next.is(tok::colon) && !ColonIsSacred) { 329 if (Actions.IsInvalidUnlessNestedName(getCurScope(), SS, II, 330 Tok.getLocation(), 331 Next.getLocation(), ObjectType, 332 EnteringContext) && 333 // If the token after the colon isn't an identifier, it's still an 334 // error, but they probably meant something else strange so don't 335 // recover like this. 336 PP.LookAhead(1).is(tok::identifier)) { 337 Diag(Next, diag::err_unexected_colon_in_nested_name_spec) 338 << FixItHint::CreateReplacement(Next.getLocation(), "::"); 339 340 // Recover as if the user wrote '::'. 341 Next.setKind(tok::coloncolon); 342 } 343 } 344 345 if (Next.is(tok::coloncolon)) { 346 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde) && 347 !Actions.isNonTypeNestedNameSpecifier(getCurScope(), SS, Tok.getLocation(), 348 II, ObjectType)) { 349 *MayBePseudoDestructor = true; 350 return false; 351 } 352 353 // We have an identifier followed by a '::'. Lookup this name 354 // as the name in a nested-name-specifier. 355 SourceLocation IdLoc = ConsumeToken(); 356 assert((Tok.is(tok::coloncolon) || Tok.is(tok::colon)) && 357 "NextToken() not working properly!"); 358 SourceLocation CCLoc = ConsumeToken(); 359 360 HasScopeSpecifier = true; 361 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(), II, IdLoc, CCLoc, 362 ObjectType, EnteringContext, SS)) 363 SS.SetInvalid(SourceRange(IdLoc, CCLoc)); 364 365 continue; 366 } 367 368 CheckForTemplateAndDigraph(Next, ObjectType, EnteringContext, II, SS); 369 370 // nested-name-specifier: 371 // type-name '<' 372 if (Next.is(tok::less)) { 373 TemplateTy Template; 374 UnqualifiedId TemplateName; 375 TemplateName.setIdentifier(&II, Tok.getLocation()); 376 bool MemberOfUnknownSpecialization; 377 if (TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS, 378 /*hasTemplateKeyword=*/false, 379 TemplateName, 380 ObjectType, 381 EnteringContext, 382 Template, 383 MemberOfUnknownSpecialization)) { 384 // We have found a template name, so annotate this this token 385 // with a template-id annotation. We do not permit the 386 // template-id to be translated into a type annotation, 387 // because some clients (e.g., the parsing of class template 388 // specializations) still want to see the original template-id 389 // token. 390 ConsumeToken(); 391 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 392 SourceLocation(), false)) 393 return true; 394 continue; 395 } 396 397 if (MemberOfUnknownSpecialization && (ObjectType || SS.isSet()) && 398 (IsTypename || IsTemplateArgumentList(1))) { 399 // We have something like t::getAs<T>, where getAs is a 400 // member of an unknown specialization. However, this will only 401 // parse correctly as a template, so suggest the keyword 'template' 402 // before 'getAs' and treat this as a dependent template name. 403 unsigned DiagID = diag::err_missing_dependent_template_keyword; 404 if (getLang().MicrosoftExt) 405 DiagID = diag::warn_missing_dependent_template_keyword; 406 407 Diag(Tok.getLocation(), DiagID) 408 << II.getName() 409 << FixItHint::CreateInsertion(Tok.getLocation(), "template "); 410 411 if (TemplateNameKind TNK 412 = Actions.ActOnDependentTemplateName(getCurScope(), 413 Tok.getLocation(), SS, 414 TemplateName, ObjectType, 415 EnteringContext, Template)) { 416 // Consume the identifier. 417 ConsumeToken(); 418 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 419 SourceLocation(), false)) 420 return true; 421 } 422 else 423 return true; 424 425 continue; 426 } 427 } 428 429 // We don't have any tokens that form the beginning of a 430 // nested-name-specifier, so we're done. 431 break; 432 } 433 434 // Even if we didn't see any pieces of a nested-name-specifier, we 435 // still check whether there is a tilde in this position, which 436 // indicates a potential pseudo-destructor. 437 if (CheckForDestructor && Tok.is(tok::tilde)) 438 *MayBePseudoDestructor = true; 439 440 return false; 441} 442 443/// ParseCXXIdExpression - Handle id-expression. 444/// 445/// id-expression: 446/// unqualified-id 447/// qualified-id 448/// 449/// qualified-id: 450/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 451/// '::' identifier 452/// '::' operator-function-id 453/// '::' template-id 454/// 455/// NOTE: The standard specifies that, for qualified-id, the parser does not 456/// expect: 457/// 458/// '::' conversion-function-id 459/// '::' '~' class-name 460/// 461/// This may cause a slight inconsistency on diagnostics: 462/// 463/// class C {}; 464/// namespace A {} 465/// void f() { 466/// :: A :: ~ C(); // Some Sema error about using destructor with a 467/// // namespace. 468/// :: ~ C(); // Some Parser error like 'unexpected ~'. 469/// } 470/// 471/// We simplify the parser a bit and make it work like: 472/// 473/// qualified-id: 474/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 475/// '::' unqualified-id 476/// 477/// That way Sema can handle and report similar errors for namespaces and the 478/// global scope. 479/// 480/// The isAddressOfOperand parameter indicates that this id-expression is a 481/// direct operand of the address-of operator. This is, besides member contexts, 482/// the only place where a qualified-id naming a non-static class member may 483/// appear. 484/// 485ExprResult Parser::ParseCXXIdExpression(bool isAddressOfOperand) { 486 // qualified-id: 487 // '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 488 // '::' unqualified-id 489 // 490 CXXScopeSpec SS; 491 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 492 493 UnqualifiedId Name; 494 if (ParseUnqualifiedId(SS, 495 /*EnteringContext=*/false, 496 /*AllowDestructorName=*/false, 497 /*AllowConstructorName=*/false, 498 /*ObjectType=*/ ParsedType(), 499 Name)) 500 return ExprError(); 501 502 // This is only the direct operand of an & operator if it is not 503 // followed by a postfix-expression suffix. 504 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 505 isAddressOfOperand = false; 506 507 return Actions.ActOnIdExpression(getCurScope(), SS, Name, Tok.is(tok::l_paren), 508 isAddressOfOperand); 509 510} 511 512/// ParseLambdaExpression - Parse a C++0x lambda expression. 513/// 514/// lambda-expression: 515/// lambda-introducer lambda-declarator[opt] compound-statement 516/// 517/// lambda-introducer: 518/// '[' lambda-capture[opt] ']' 519/// 520/// lambda-capture: 521/// capture-default 522/// capture-list 523/// capture-default ',' capture-list 524/// 525/// capture-default: 526/// '&' 527/// '=' 528/// 529/// capture-list: 530/// capture 531/// capture-list ',' capture 532/// 533/// capture: 534/// identifier 535/// '&' identifier 536/// 'this' 537/// 538/// lambda-declarator: 539/// '(' parameter-declaration-clause ')' attribute-specifier[opt] 540/// 'mutable'[opt] exception-specification[opt] 541/// trailing-return-type[opt] 542/// 543ExprResult Parser::ParseLambdaExpression() { 544 // Parse lambda-introducer. 545 LambdaIntroducer Intro; 546 547 llvm::Optional<unsigned> DiagID(ParseLambdaIntroducer(Intro)); 548 if (DiagID) { 549 Diag(Tok, DiagID.getValue()); 550 SkipUntil(tok::r_square); 551 } 552 553 return ParseLambdaExpressionAfterIntroducer(Intro); 554} 555 556/// TryParseLambdaExpression - Use lookahead and potentially tentative 557/// parsing to determine if we are looking at a C++0x lambda expression, and parse 558/// it if we are. 559/// 560/// If we are not looking at a lambda expression, returns ExprError(). 561ExprResult Parser::TryParseLambdaExpression() { 562 assert(getLang().CPlusPlus0x 563 && Tok.is(tok::l_square) 564 && "Not at the start of a possible lambda expression."); 565 566 const Token Next = NextToken(), After = GetLookAheadToken(2); 567 568 // If lookahead indicates this is a lambda... 569 if (Next.is(tok::r_square) || // [] 570 Next.is(tok::equal) || // [= 571 (Next.is(tok::amp) && // [&] or [&, 572 (After.is(tok::r_square) || 573 After.is(tok::comma))) || 574 (Next.is(tok::identifier) && // [identifier] 575 After.is(tok::r_square))) { 576 return ParseLambdaExpression(); 577 } 578 579 // If lookahead indicates this is an Objective-C message... 580 if (Next.is(tok::identifier) && After.is(tok::identifier)) { 581 return ExprError(); 582 } 583 584 LambdaIntroducer Intro; 585 if (TryParseLambdaIntroducer(Intro)) 586 return ExprError(); 587 return ParseLambdaExpressionAfterIntroducer(Intro); 588} 589 590/// ParseLambdaExpression - Parse a lambda introducer. 591/// 592/// Returns a DiagnosticID if it hit something unexpected. 593llvm::Optional<unsigned> Parser::ParseLambdaIntroducer(LambdaIntroducer &Intro) { 594 typedef llvm::Optional<unsigned> DiagResult; 595 596 assert(Tok.is(tok::l_square) && "Lambda expressions begin with '['."); 597 BalancedDelimiterTracker T(*this, tok::l_square); 598 T.consumeOpen(); 599 600 Intro.Range.setBegin(T.getOpenLocation()); 601 602 bool first = true; 603 604 // Parse capture-default. 605 if (Tok.is(tok::amp) && 606 (NextToken().is(tok::comma) || NextToken().is(tok::r_square))) { 607 Intro.Default = LCD_ByRef; 608 ConsumeToken(); 609 first = false; 610 } else if (Tok.is(tok::equal)) { 611 Intro.Default = LCD_ByCopy; 612 ConsumeToken(); 613 first = false; 614 } 615 616 while (Tok.isNot(tok::r_square)) { 617 if (!first) { 618 if (Tok.isNot(tok::comma)) 619 return DiagResult(diag::err_expected_comma_or_rsquare); 620 ConsumeToken(); 621 } 622 623 first = false; 624 625 // Parse capture. 626 LambdaCaptureKind Kind = LCK_ByCopy; 627 SourceLocation Loc; 628 IdentifierInfo* Id = 0; 629 630 if (Tok.is(tok::kw_this)) { 631 Kind = LCK_This; 632 Loc = ConsumeToken(); 633 } else { 634 if (Tok.is(tok::amp)) { 635 Kind = LCK_ByRef; 636 ConsumeToken(); 637 } 638 639 if (Tok.is(tok::identifier)) { 640 Id = Tok.getIdentifierInfo(); 641 Loc = ConsumeToken(); 642 } else if (Tok.is(tok::kw_this)) { 643 // FIXME: If we want to suggest a fixit here, will need to return more 644 // than just DiagnosticID. Perhaps full DiagnosticBuilder that can be 645 // Clear()ed to prevent emission in case of tentative parsing? 646 return DiagResult(diag::err_this_captured_by_reference); 647 } else { 648 return DiagResult(diag::err_expected_capture); 649 } 650 } 651 652 Intro.addCapture(Kind, Loc, Id); 653 } 654 655 T.consumeClose(); 656 Intro.Range.setEnd(T.getCloseLocation()); 657 658 return DiagResult(); 659} 660 661/// TryParseLambdaExpression - Tentatively parse a lambda introducer. 662/// 663/// Returns true if it hit something unexpected. 664bool Parser::TryParseLambdaIntroducer(LambdaIntroducer &Intro) { 665 TentativeParsingAction PA(*this); 666 667 llvm::Optional<unsigned> DiagID(ParseLambdaIntroducer(Intro)); 668 669 if (DiagID) { 670 PA.Revert(); 671 return true; 672 } 673 674 PA.Commit(); 675 return false; 676} 677 678/// ParseLambdaExpressionAfterIntroducer - Parse the rest of a lambda 679/// expression. 680ExprResult Parser::ParseLambdaExpressionAfterIntroducer( 681 LambdaIntroducer &Intro) { 682 // Parse lambda-declarator[opt]. 683 DeclSpec DS(AttrFactory); 684 Declarator D(DS, Declarator::PrototypeContext); 685 686 if (Tok.is(tok::l_paren)) { 687 ParseScope PrototypeScope(this, 688 Scope::FunctionPrototypeScope | 689 Scope::DeclScope); 690 691 SourceLocation DeclLoc, DeclEndLoc; 692 BalancedDelimiterTracker T(*this, tok::l_paren); 693 T.consumeOpen(); 694 DeclLoc = T.getOpenLocation(); 695 696 // Parse parameter-declaration-clause. 697 ParsedAttributes Attr(AttrFactory); 698 llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo; 699 SourceLocation EllipsisLoc; 700 701 if (Tok.isNot(tok::r_paren)) 702 ParseParameterDeclarationClause(D, Attr, ParamInfo, EllipsisLoc); 703 704 T.consumeClose(); 705 DeclEndLoc = T.getCloseLocation(); 706 707 // Parse 'mutable'[opt]. 708 SourceLocation MutableLoc; 709 if (Tok.is(tok::kw_mutable)) { 710 MutableLoc = ConsumeToken(); 711 DeclEndLoc = MutableLoc; 712 } 713 714 // Parse exception-specification[opt]. 715 ExceptionSpecificationType ESpecType = EST_None; 716 SourceRange ESpecRange; 717 llvm::SmallVector<ParsedType, 2> DynamicExceptions; 718 llvm::SmallVector<SourceRange, 2> DynamicExceptionRanges; 719 ExprResult NoexceptExpr; 720 ESpecType = MaybeParseExceptionSpecification(ESpecRange, 721 DynamicExceptions, 722 DynamicExceptionRanges, 723 NoexceptExpr); 724 725 if (ESpecType != EST_None) 726 DeclEndLoc = ESpecRange.getEnd(); 727 728 // Parse attribute-specifier[opt]. 729 MaybeParseCXX0XAttributes(Attr, &DeclEndLoc); 730 731 // Parse trailing-return-type[opt]. 732 ParsedType TrailingReturnType; 733 if (Tok.is(tok::arrow)) { 734 SourceRange Range; 735 TrailingReturnType = ParseTrailingReturnType(Range).get(); 736 if (Range.getEnd().isValid()) 737 DeclEndLoc = Range.getEnd(); 738 } 739 740 PrototypeScope.Exit(); 741 742 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true, 743 /*isVariadic=*/EllipsisLoc.isValid(), 744 EllipsisLoc, 745 ParamInfo.data(), ParamInfo.size(), 746 DS.getTypeQualifiers(), 747 /*RefQualifierIsLValueRef=*/true, 748 /*RefQualifierLoc=*/SourceLocation(), 749 MutableLoc, 750 ESpecType, ESpecRange.getBegin(), 751 DynamicExceptions.data(), 752 DynamicExceptionRanges.data(), 753 DynamicExceptions.size(), 754 NoexceptExpr.isUsable() ? 755 NoexceptExpr.get() : 0, 756 DeclLoc, DeclEndLoc, D, 757 TrailingReturnType), 758 Attr, DeclEndLoc); 759 } 760 761 // Parse compound-statement. 762 if (Tok.is(tok::l_brace)) { 763 // FIXME: Rename BlockScope -> ClosureScope if we decide to continue using 764 // it. 765 ParseScope BodyScope(this, Scope::BlockScope | Scope::FnScope | 766 Scope::BreakScope | Scope::ContinueScope | 767 Scope::DeclScope); 768 769 StmtResult Stmt(ParseCompoundStatementBody()); 770 771 BodyScope.Exit(); 772 } else { 773 Diag(Tok, diag::err_expected_lambda_body); 774 } 775 776 return ExprEmpty(); 777} 778 779/// ParseCXXCasts - This handles the various ways to cast expressions to another 780/// type. 781/// 782/// postfix-expression: [C++ 5.2p1] 783/// 'dynamic_cast' '<' type-name '>' '(' expression ')' 784/// 'static_cast' '<' type-name '>' '(' expression ')' 785/// 'reinterpret_cast' '<' type-name '>' '(' expression ')' 786/// 'const_cast' '<' type-name '>' '(' expression ')' 787/// 788ExprResult Parser::ParseCXXCasts() { 789 tok::TokenKind Kind = Tok.getKind(); 790 const char *CastName = 0; // For error messages 791 792 switch (Kind) { 793 default: llvm_unreachable("Unknown C++ cast!"); 794 case tok::kw_const_cast: CastName = "const_cast"; break; 795 case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break; 796 case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break; 797 case tok::kw_static_cast: CastName = "static_cast"; break; 798 } 799 800 SourceLocation OpLoc = ConsumeToken(); 801 SourceLocation LAngleBracketLoc = Tok.getLocation(); 802 803 // Check for "<::" which is parsed as "[:". If found, fix token stream, 804 // diagnose error, suggest fix, and recover parsing. 805 Token Next = NextToken(); 806 if (Tok.is(tok::l_square) && Tok.getLength() == 2 && Next.is(tok::colon) && 807 AreTokensAdjacent(PP, Tok, Next)) 808 FixDigraph(*this, PP, Tok, Next, Kind, /*AtDigraph*/true); 809 810 if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName)) 811 return ExprError(); 812 813 // Parse the common declaration-specifiers piece. 814 DeclSpec DS(AttrFactory); 815 ParseSpecifierQualifierList(DS); 816 817 // Parse the abstract-declarator, if present. 818 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 819 ParseDeclarator(DeclaratorInfo); 820 821 SourceLocation RAngleBracketLoc = Tok.getLocation(); 822 823 if (ExpectAndConsume(tok::greater, diag::err_expected_greater)) 824 return ExprError(Diag(LAngleBracketLoc, diag::note_matching) << "<"); 825 826 SourceLocation LParenLoc, RParenLoc; 827 BalancedDelimiterTracker T(*this, tok::l_paren); 828 829 if (T.expectAndConsume(diag::err_expected_lparen_after, CastName)) 830 return ExprError(); 831 832 ExprResult Result = ParseExpression(); 833 834 // Match the ')'. 835 T.consumeClose(); 836 837 if (!Result.isInvalid() && !DeclaratorInfo.isInvalidType()) 838 Result = Actions.ActOnCXXNamedCast(OpLoc, Kind, 839 LAngleBracketLoc, DeclaratorInfo, 840 RAngleBracketLoc, 841 T.getOpenLocation(), Result.take(), 842 T.getCloseLocation()); 843 844 return move(Result); 845} 846 847/// ParseCXXTypeid - This handles the C++ typeid expression. 848/// 849/// postfix-expression: [C++ 5.2p1] 850/// 'typeid' '(' expression ')' 851/// 'typeid' '(' type-id ')' 852/// 853ExprResult Parser::ParseCXXTypeid() { 854 assert(Tok.is(tok::kw_typeid) && "Not 'typeid'!"); 855 856 SourceLocation OpLoc = ConsumeToken(); 857 SourceLocation LParenLoc, RParenLoc; 858 BalancedDelimiterTracker T(*this, tok::l_paren); 859 860 // typeid expressions are always parenthesized. 861 if (T.expectAndConsume(diag::err_expected_lparen_after, "typeid")) 862 return ExprError(); 863 LParenLoc = T.getOpenLocation(); 864 865 ExprResult Result; 866 867 if (isTypeIdInParens()) { 868 TypeResult Ty = ParseTypeName(); 869 870 // Match the ')'. 871 T.consumeClose(); 872 RParenLoc = T.getCloseLocation(); 873 if (Ty.isInvalid() || RParenLoc.isInvalid()) 874 return ExprError(); 875 876 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/true, 877 Ty.get().getAsOpaquePtr(), RParenLoc); 878 } else { 879 // C++0x [expr.typeid]p3: 880 // When typeid is applied to an expression other than an lvalue of a 881 // polymorphic class type [...] The expression is an unevaluated 882 // operand (Clause 5). 883 // 884 // Note that we can't tell whether the expression is an lvalue of a 885 // polymorphic class type until after we've parsed the expression, so 886 // we the expression is potentially potentially evaluated. 887 EnterExpressionEvaluationContext Unevaluated(Actions, 888 Sema::PotentiallyPotentiallyEvaluated); 889 Result = ParseExpression(); 890 891 // Match the ')'. 892 if (Result.isInvalid()) 893 SkipUntil(tok::r_paren); 894 else { 895 T.consumeClose(); 896 RParenLoc = T.getCloseLocation(); 897 if (RParenLoc.isInvalid()) 898 return ExprError(); 899 900 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/false, 901 Result.release(), RParenLoc); 902 } 903 } 904 905 return move(Result); 906} 907 908/// ParseCXXUuidof - This handles the Microsoft C++ __uuidof expression. 909/// 910/// '__uuidof' '(' expression ')' 911/// '__uuidof' '(' type-id ')' 912/// 913ExprResult Parser::ParseCXXUuidof() { 914 assert(Tok.is(tok::kw___uuidof) && "Not '__uuidof'!"); 915 916 SourceLocation OpLoc = ConsumeToken(); 917 BalancedDelimiterTracker T(*this, tok::l_paren); 918 919 // __uuidof expressions are always parenthesized. 920 if (T.expectAndConsume(diag::err_expected_lparen_after, "__uuidof")) 921 return ExprError(); 922 923 ExprResult Result; 924 925 if (isTypeIdInParens()) { 926 TypeResult Ty = ParseTypeName(); 927 928 // Match the ')'. 929 T.consumeClose(); 930 931 if (Ty.isInvalid()) 932 return ExprError(); 933 934 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(), /*isType=*/true, 935 Ty.get().getAsOpaquePtr(), 936 T.getCloseLocation()); 937 } else { 938 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 939 Result = ParseExpression(); 940 941 // Match the ')'. 942 if (Result.isInvalid()) 943 SkipUntil(tok::r_paren); 944 else { 945 T.consumeClose(); 946 947 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(), 948 /*isType=*/false, 949 Result.release(), T.getCloseLocation()); 950 } 951 } 952 953 return move(Result); 954} 955 956/// \brief Parse a C++ pseudo-destructor expression after the base, 957/// . or -> operator, and nested-name-specifier have already been 958/// parsed. 959/// 960/// postfix-expression: [C++ 5.2] 961/// postfix-expression . pseudo-destructor-name 962/// postfix-expression -> pseudo-destructor-name 963/// 964/// pseudo-destructor-name: 965/// ::[opt] nested-name-specifier[opt] type-name :: ~type-name 966/// ::[opt] nested-name-specifier template simple-template-id :: 967/// ~type-name 968/// ::[opt] nested-name-specifier[opt] ~type-name 969/// 970ExprResult 971Parser::ParseCXXPseudoDestructor(ExprArg Base, SourceLocation OpLoc, 972 tok::TokenKind OpKind, 973 CXXScopeSpec &SS, 974 ParsedType ObjectType) { 975 // We're parsing either a pseudo-destructor-name or a dependent 976 // member access that has the same form as a 977 // pseudo-destructor-name. We parse both in the same way and let 978 // the action model sort them out. 979 // 980 // Note that the ::[opt] nested-name-specifier[opt] has already 981 // been parsed, and if there was a simple-template-id, it has 982 // been coalesced into a template-id annotation token. 983 UnqualifiedId FirstTypeName; 984 SourceLocation CCLoc; 985 if (Tok.is(tok::identifier)) { 986 FirstTypeName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 987 ConsumeToken(); 988 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail"); 989 CCLoc = ConsumeToken(); 990 } else if (Tok.is(tok::annot_template_id)) { 991 FirstTypeName.setTemplateId( 992 (TemplateIdAnnotation *)Tok.getAnnotationValue()); 993 ConsumeToken(); 994 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail"); 995 CCLoc = ConsumeToken(); 996 } else { 997 FirstTypeName.setIdentifier(0, SourceLocation()); 998 } 999 1000 // Parse the tilde. 1001 assert(Tok.is(tok::tilde) && "ParseOptionalCXXScopeSpecifier fail"); 1002 SourceLocation TildeLoc = ConsumeToken(); 1003 if (!Tok.is(tok::identifier)) { 1004 Diag(Tok, diag::err_destructor_tilde_identifier); 1005 return ExprError(); 1006 } 1007 1008 // Parse the second type. 1009 UnqualifiedId SecondTypeName; 1010 IdentifierInfo *Name = Tok.getIdentifierInfo(); 1011 SourceLocation NameLoc = ConsumeToken(); 1012 SecondTypeName.setIdentifier(Name, NameLoc); 1013 1014 // If there is a '<', the second type name is a template-id. Parse 1015 // it as such. 1016 if (Tok.is(tok::less) && 1017 ParseUnqualifiedIdTemplateId(SS, Name, NameLoc, false, ObjectType, 1018 SecondTypeName, /*AssumeTemplateName=*/true, 1019 /*TemplateKWLoc*/SourceLocation())) 1020 return ExprError(); 1021 1022 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, 1023 OpLoc, OpKind, 1024 SS, FirstTypeName, CCLoc, 1025 TildeLoc, SecondTypeName, 1026 Tok.is(tok::l_paren)); 1027} 1028 1029/// ParseCXXBoolLiteral - This handles the C++ Boolean literals. 1030/// 1031/// boolean-literal: [C++ 2.13.5] 1032/// 'true' 1033/// 'false' 1034ExprResult Parser::ParseCXXBoolLiteral() { 1035 tok::TokenKind Kind = Tok.getKind(); 1036 return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind); 1037} 1038 1039/// ParseThrowExpression - This handles the C++ throw expression. 1040/// 1041/// throw-expression: [C++ 15] 1042/// 'throw' assignment-expression[opt] 1043ExprResult Parser::ParseThrowExpression() { 1044 assert(Tok.is(tok::kw_throw) && "Not throw!"); 1045 SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token. 1046 1047 // If the current token isn't the start of an assignment-expression, 1048 // then the expression is not present. This handles things like: 1049 // "C ? throw : (void)42", which is crazy but legal. 1050 switch (Tok.getKind()) { // FIXME: move this predicate somewhere common. 1051 case tok::semi: 1052 case tok::r_paren: 1053 case tok::r_square: 1054 case tok::r_brace: 1055 case tok::colon: 1056 case tok::comma: 1057 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, 0); 1058 1059 default: 1060 ExprResult Expr(ParseAssignmentExpression()); 1061 if (Expr.isInvalid()) return move(Expr); 1062 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, Expr.take()); 1063 } 1064} 1065 1066/// ParseCXXThis - This handles the C++ 'this' pointer. 1067/// 1068/// C++ 9.3.2: In the body of a non-static member function, the keyword this is 1069/// a non-lvalue expression whose value is the address of the object for which 1070/// the function is called. 1071ExprResult Parser::ParseCXXThis() { 1072 assert(Tok.is(tok::kw_this) && "Not 'this'!"); 1073 SourceLocation ThisLoc = ConsumeToken(); 1074 return Actions.ActOnCXXThis(ThisLoc); 1075} 1076 1077/// ParseCXXTypeConstructExpression - Parse construction of a specified type. 1078/// Can be interpreted either as function-style casting ("int(x)") 1079/// or class type construction ("ClassType(x,y,z)") 1080/// or creation of a value-initialized type ("int()"). 1081/// See [C++ 5.2.3]. 1082/// 1083/// postfix-expression: [C++ 5.2p1] 1084/// simple-type-specifier '(' expression-list[opt] ')' 1085/// [C++0x] simple-type-specifier braced-init-list 1086/// typename-specifier '(' expression-list[opt] ')' 1087/// [C++0x] typename-specifier braced-init-list 1088/// 1089ExprResult 1090Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) { 1091 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1092 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo).get(); 1093 1094 assert((Tok.is(tok::l_paren) || 1095 (getLang().CPlusPlus0x && Tok.is(tok::l_brace))) 1096 && "Expected '(' or '{'!"); 1097 1098 if (Tok.is(tok::l_brace)) { 1099 1100 // FIXME: Convert to a proper type construct expression. 1101 return ParseBraceInitializer(); 1102 1103 } else { 1104 GreaterThanIsOperatorScope G(GreaterThanIsOperator, true); 1105 1106 BalancedDelimiterTracker T(*this, tok::l_paren); 1107 T.consumeOpen(); 1108 1109 ExprVector Exprs(Actions); 1110 CommaLocsTy CommaLocs; 1111 1112 if (Tok.isNot(tok::r_paren)) { 1113 if (ParseExpressionList(Exprs, CommaLocs)) { 1114 SkipUntil(tok::r_paren); 1115 return ExprError(); 1116 } 1117 } 1118 1119 // Match the ')'. 1120 T.consumeClose(); 1121 1122 // TypeRep could be null, if it references an invalid typedef. 1123 if (!TypeRep) 1124 return ExprError(); 1125 1126 assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&& 1127 "Unexpected number of commas!"); 1128 return Actions.ActOnCXXTypeConstructExpr(TypeRep, T.getOpenLocation(), 1129 move_arg(Exprs), 1130 T.getCloseLocation()); 1131 } 1132} 1133 1134/// ParseCXXCondition - if/switch/while condition expression. 1135/// 1136/// condition: 1137/// expression 1138/// type-specifier-seq declarator '=' assignment-expression 1139/// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt] 1140/// '=' assignment-expression 1141/// 1142/// \param ExprResult if the condition was parsed as an expression, the 1143/// parsed expression. 1144/// 1145/// \param DeclResult if the condition was parsed as a declaration, the 1146/// parsed declaration. 1147/// 1148/// \param Loc The location of the start of the statement that requires this 1149/// condition, e.g., the "for" in a for loop. 1150/// 1151/// \param ConvertToBoolean Whether the condition expression should be 1152/// converted to a boolean value. 1153/// 1154/// \returns true if there was a parsing, false otherwise. 1155bool Parser::ParseCXXCondition(ExprResult &ExprOut, 1156 Decl *&DeclOut, 1157 SourceLocation Loc, 1158 bool ConvertToBoolean) { 1159 if (Tok.is(tok::code_completion)) { 1160 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Condition); 1161 cutOffParsing(); 1162 return true; 1163 } 1164 1165 if (!isCXXConditionDeclaration()) { 1166 // Parse the expression. 1167 ExprOut = ParseExpression(); // expression 1168 DeclOut = 0; 1169 if (ExprOut.isInvalid()) 1170 return true; 1171 1172 // If required, convert to a boolean value. 1173 if (ConvertToBoolean) 1174 ExprOut 1175 = Actions.ActOnBooleanCondition(getCurScope(), Loc, ExprOut.get()); 1176 return ExprOut.isInvalid(); 1177 } 1178 1179 // type-specifier-seq 1180 DeclSpec DS(AttrFactory); 1181 ParseSpecifierQualifierList(DS); 1182 1183 // declarator 1184 Declarator DeclaratorInfo(DS, Declarator::ConditionContext); 1185 ParseDeclarator(DeclaratorInfo); 1186 1187 // simple-asm-expr[opt] 1188 if (Tok.is(tok::kw_asm)) { 1189 SourceLocation Loc; 1190 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1191 if (AsmLabel.isInvalid()) { 1192 SkipUntil(tok::semi); 1193 return true; 1194 } 1195 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1196 DeclaratorInfo.SetRangeEnd(Loc); 1197 } 1198 1199 // If attributes are present, parse them. 1200 MaybeParseGNUAttributes(DeclaratorInfo); 1201 1202 // Type-check the declaration itself. 1203 DeclResult Dcl = Actions.ActOnCXXConditionDeclaration(getCurScope(), 1204 DeclaratorInfo); 1205 DeclOut = Dcl.get(); 1206 ExprOut = ExprError(); 1207 1208 // '=' assignment-expression 1209 if (isTokenEqualOrMistypedEqualEqual( 1210 diag::err_invalid_equalequal_after_declarator)) { 1211 ConsumeToken(); 1212 ExprResult AssignExpr(ParseAssignmentExpression()); 1213 if (!AssignExpr.isInvalid()) 1214 Actions.AddInitializerToDecl(DeclOut, AssignExpr.take(), false, 1215 DS.getTypeSpecType() == DeclSpec::TST_auto); 1216 } else { 1217 // FIXME: C++0x allows a braced-init-list 1218 Diag(Tok, diag::err_expected_equal_after_declarator); 1219 } 1220 1221 // FIXME: Build a reference to this declaration? Convert it to bool? 1222 // (This is currently handled by Sema). 1223 1224 Actions.FinalizeDeclaration(DeclOut); 1225 1226 return false; 1227} 1228 1229/// \brief Determine whether the current token starts a C++ 1230/// simple-type-specifier. 1231bool Parser::isCXXSimpleTypeSpecifier() const { 1232 switch (Tok.getKind()) { 1233 case tok::annot_typename: 1234 case tok::kw_short: 1235 case tok::kw_long: 1236 case tok::kw___int64: 1237 case tok::kw_signed: 1238 case tok::kw_unsigned: 1239 case tok::kw_void: 1240 case tok::kw_char: 1241 case tok::kw_int: 1242 case tok::kw_half: 1243 case tok::kw_float: 1244 case tok::kw_double: 1245 case tok::kw_wchar_t: 1246 case tok::kw_char16_t: 1247 case tok::kw_char32_t: 1248 case tok::kw_bool: 1249 case tok::kw_decltype: 1250 case tok::kw_typeof: 1251 case tok::kw___underlying_type: 1252 return true; 1253 1254 default: 1255 break; 1256 } 1257 1258 return false; 1259} 1260 1261/// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers. 1262/// This should only be called when the current token is known to be part of 1263/// simple-type-specifier. 1264/// 1265/// simple-type-specifier: 1266/// '::'[opt] nested-name-specifier[opt] type-name 1267/// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO] 1268/// char 1269/// wchar_t 1270/// bool 1271/// short 1272/// int 1273/// long 1274/// signed 1275/// unsigned 1276/// float 1277/// double 1278/// void 1279/// [GNU] typeof-specifier 1280/// [C++0x] auto [TODO] 1281/// 1282/// type-name: 1283/// class-name 1284/// enum-name 1285/// typedef-name 1286/// 1287void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) { 1288 DS.SetRangeStart(Tok.getLocation()); 1289 const char *PrevSpec; 1290 unsigned DiagID; 1291 SourceLocation Loc = Tok.getLocation(); 1292 1293 switch (Tok.getKind()) { 1294 case tok::identifier: // foo::bar 1295 case tok::coloncolon: // ::foo::bar 1296 llvm_unreachable("Annotation token should already be formed!"); 1297 default: 1298 llvm_unreachable("Not a simple-type-specifier token!"); 1299 1300 // type-name 1301 case tok::annot_typename: { 1302 if (getTypeAnnotation(Tok)) 1303 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, 1304 getTypeAnnotation(Tok)); 1305 else 1306 DS.SetTypeSpecError(); 1307 1308 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 1309 ConsumeToken(); 1310 1311 // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id' 1312 // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an 1313 // Objective-C interface. If we don't have Objective-C or a '<', this is 1314 // just a normal reference to a typedef name. 1315 if (Tok.is(tok::less) && getLang().ObjC1) 1316 ParseObjCProtocolQualifiers(DS); 1317 1318 DS.Finish(Diags, PP); 1319 return; 1320 } 1321 1322 // builtin types 1323 case tok::kw_short: 1324 DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID); 1325 break; 1326 case tok::kw_long: 1327 DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, DiagID); 1328 break; 1329 case tok::kw___int64: 1330 DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, DiagID); 1331 break; 1332 case tok::kw_signed: 1333 DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID); 1334 break; 1335 case tok::kw_unsigned: 1336 DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, DiagID); 1337 break; 1338 case tok::kw_void: 1339 DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID); 1340 break; 1341 case tok::kw_char: 1342 DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID); 1343 break; 1344 case tok::kw_int: 1345 DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID); 1346 break; 1347 case tok::kw_half: 1348 DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec, DiagID); 1349 break; 1350 case tok::kw_float: 1351 DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID); 1352 break; 1353 case tok::kw_double: 1354 DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID); 1355 break; 1356 case tok::kw_wchar_t: 1357 DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID); 1358 break; 1359 case tok::kw_char16_t: 1360 DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID); 1361 break; 1362 case tok::kw_char32_t: 1363 DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID); 1364 break; 1365 case tok::kw_bool: 1366 DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID); 1367 break; 1368 1369 // FIXME: C++0x decltype support. 1370 // GNU typeof support. 1371 case tok::kw_typeof: 1372 ParseTypeofSpecifier(DS); 1373 DS.Finish(Diags, PP); 1374 return; 1375 } 1376 if (Tok.is(tok::annot_typename)) 1377 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 1378 else 1379 DS.SetRangeEnd(Tok.getLocation()); 1380 ConsumeToken(); 1381 DS.Finish(Diags, PP); 1382} 1383 1384/// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++ 1385/// [dcl.name]), which is a non-empty sequence of type-specifiers, 1386/// e.g., "const short int". Note that the DeclSpec is *not* finished 1387/// by parsing the type-specifier-seq, because these sequences are 1388/// typically followed by some form of declarator. Returns true and 1389/// emits diagnostics if this is not a type-specifier-seq, false 1390/// otherwise. 1391/// 1392/// type-specifier-seq: [C++ 8.1] 1393/// type-specifier type-specifier-seq[opt] 1394/// 1395bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) { 1396 DS.SetRangeStart(Tok.getLocation()); 1397 const char *PrevSpec = 0; 1398 unsigned DiagID; 1399 bool isInvalid = 0; 1400 1401 // Parse one or more of the type specifiers. 1402 if (!ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec, DiagID, 1403 ParsedTemplateInfo(), /*SuppressDeclarations*/true)) { 1404 Diag(Tok, diag::err_expected_type); 1405 return true; 1406 } 1407 1408 while (ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec, DiagID, 1409 ParsedTemplateInfo(), /*SuppressDeclarations*/true)) 1410 {} 1411 1412 DS.Finish(Diags, PP); 1413 return false; 1414} 1415 1416/// \brief Finish parsing a C++ unqualified-id that is a template-id of 1417/// some form. 1418/// 1419/// This routine is invoked when a '<' is encountered after an identifier or 1420/// operator-function-id is parsed by \c ParseUnqualifiedId() to determine 1421/// whether the unqualified-id is actually a template-id. This routine will 1422/// then parse the template arguments and form the appropriate template-id to 1423/// return to the caller. 1424/// 1425/// \param SS the nested-name-specifier that precedes this template-id, if 1426/// we're actually parsing a qualified-id. 1427/// 1428/// \param Name for constructor and destructor names, this is the actual 1429/// identifier that may be a template-name. 1430/// 1431/// \param NameLoc the location of the class-name in a constructor or 1432/// destructor. 1433/// 1434/// \param EnteringContext whether we're entering the scope of the 1435/// nested-name-specifier. 1436/// 1437/// \param ObjectType if this unqualified-id occurs within a member access 1438/// expression, the type of the base object whose member is being accessed. 1439/// 1440/// \param Id as input, describes the template-name or operator-function-id 1441/// that precedes the '<'. If template arguments were parsed successfully, 1442/// will be updated with the template-id. 1443/// 1444/// \param AssumeTemplateId When true, this routine will assume that the name 1445/// refers to a template without performing name lookup to verify. 1446/// 1447/// \returns true if a parse error occurred, false otherwise. 1448bool Parser::ParseUnqualifiedIdTemplateId(CXXScopeSpec &SS, 1449 IdentifierInfo *Name, 1450 SourceLocation NameLoc, 1451 bool EnteringContext, 1452 ParsedType ObjectType, 1453 UnqualifiedId &Id, 1454 bool AssumeTemplateId, 1455 SourceLocation TemplateKWLoc) { 1456 assert((AssumeTemplateId || Tok.is(tok::less)) && 1457 "Expected '<' to finish parsing a template-id"); 1458 1459 TemplateTy Template; 1460 TemplateNameKind TNK = TNK_Non_template; 1461 switch (Id.getKind()) { 1462 case UnqualifiedId::IK_Identifier: 1463 case UnqualifiedId::IK_OperatorFunctionId: 1464 case UnqualifiedId::IK_LiteralOperatorId: 1465 if (AssumeTemplateId) { 1466 TNK = Actions.ActOnDependentTemplateName(getCurScope(), TemplateKWLoc, SS, 1467 Id, ObjectType, EnteringContext, 1468 Template); 1469 if (TNK == TNK_Non_template) 1470 return true; 1471 } else { 1472 bool MemberOfUnknownSpecialization; 1473 TNK = Actions.isTemplateName(getCurScope(), SS, 1474 TemplateKWLoc.isValid(), Id, 1475 ObjectType, EnteringContext, Template, 1476 MemberOfUnknownSpecialization); 1477 1478 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization && 1479 ObjectType && IsTemplateArgumentList()) { 1480 // We have something like t->getAs<T>(), where getAs is a 1481 // member of an unknown specialization. However, this will only 1482 // parse correctly as a template, so suggest the keyword 'template' 1483 // before 'getAs' and treat this as a dependent template name. 1484 std::string Name; 1485 if (Id.getKind() == UnqualifiedId::IK_Identifier) 1486 Name = Id.Identifier->getName(); 1487 else { 1488 Name = "operator "; 1489 if (Id.getKind() == UnqualifiedId::IK_OperatorFunctionId) 1490 Name += getOperatorSpelling(Id.OperatorFunctionId.Operator); 1491 else 1492 Name += Id.Identifier->getName(); 1493 } 1494 Diag(Id.StartLocation, diag::err_missing_dependent_template_keyword) 1495 << Name 1496 << FixItHint::CreateInsertion(Id.StartLocation, "template "); 1497 TNK = Actions.ActOnDependentTemplateName(getCurScope(), TemplateKWLoc, 1498 SS, Id, ObjectType, 1499 EnteringContext, Template); 1500 if (TNK == TNK_Non_template) 1501 return true; 1502 } 1503 } 1504 break; 1505 1506 case UnqualifiedId::IK_ConstructorName: { 1507 UnqualifiedId TemplateName; 1508 bool MemberOfUnknownSpecialization; 1509 TemplateName.setIdentifier(Name, NameLoc); 1510 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(), 1511 TemplateName, ObjectType, 1512 EnteringContext, Template, 1513 MemberOfUnknownSpecialization); 1514 break; 1515 } 1516 1517 case UnqualifiedId::IK_DestructorName: { 1518 UnqualifiedId TemplateName; 1519 bool MemberOfUnknownSpecialization; 1520 TemplateName.setIdentifier(Name, NameLoc); 1521 if (ObjectType) { 1522 TNK = Actions.ActOnDependentTemplateName(getCurScope(), TemplateKWLoc, SS, 1523 TemplateName, ObjectType, 1524 EnteringContext, Template); 1525 if (TNK == TNK_Non_template) 1526 return true; 1527 } else { 1528 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(), 1529 TemplateName, ObjectType, 1530 EnteringContext, Template, 1531 MemberOfUnknownSpecialization); 1532 1533 if (TNK == TNK_Non_template && !Id.DestructorName.get()) { 1534 Diag(NameLoc, diag::err_destructor_template_id) 1535 << Name << SS.getRange(); 1536 return true; 1537 } 1538 } 1539 break; 1540 } 1541 1542 default: 1543 return false; 1544 } 1545 1546 if (TNK == TNK_Non_template) 1547 return false; 1548 1549 // Parse the enclosed template argument list. 1550 SourceLocation LAngleLoc, RAngleLoc; 1551 TemplateArgList TemplateArgs; 1552 if (Tok.is(tok::less) && 1553 ParseTemplateIdAfterTemplateName(Template, Id.StartLocation, 1554 SS, true, LAngleLoc, 1555 TemplateArgs, 1556 RAngleLoc)) 1557 return true; 1558 1559 if (Id.getKind() == UnqualifiedId::IK_Identifier || 1560 Id.getKind() == UnqualifiedId::IK_OperatorFunctionId || 1561 Id.getKind() == UnqualifiedId::IK_LiteralOperatorId) { 1562 // Form a parsed representation of the template-id to be stored in the 1563 // UnqualifiedId. 1564 TemplateIdAnnotation *TemplateId 1565 = TemplateIdAnnotation::Allocate(TemplateArgs.size()); 1566 1567 if (Id.getKind() == UnqualifiedId::IK_Identifier) { 1568 TemplateId->Name = Id.Identifier; 1569 TemplateId->Operator = OO_None; 1570 TemplateId->TemplateNameLoc = Id.StartLocation; 1571 } else { 1572 TemplateId->Name = 0; 1573 TemplateId->Operator = Id.OperatorFunctionId.Operator; 1574 TemplateId->TemplateNameLoc = Id.StartLocation; 1575 } 1576 1577 TemplateId->SS = SS; 1578 TemplateId->Template = Template; 1579 TemplateId->Kind = TNK; 1580 TemplateId->LAngleLoc = LAngleLoc; 1581 TemplateId->RAngleLoc = RAngleLoc; 1582 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs(); 1583 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); 1584 Arg != ArgEnd; ++Arg) 1585 Args[Arg] = TemplateArgs[Arg]; 1586 1587 Id.setTemplateId(TemplateId); 1588 return false; 1589 } 1590 1591 // Bundle the template arguments together. 1592 ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(), 1593 TemplateArgs.size()); 1594 1595 // Constructor and destructor names. 1596 TypeResult Type 1597 = Actions.ActOnTemplateIdType(SS, Template, NameLoc, 1598 LAngleLoc, TemplateArgsPtr, 1599 RAngleLoc); 1600 if (Type.isInvalid()) 1601 return true; 1602 1603 if (Id.getKind() == UnqualifiedId::IK_ConstructorName) 1604 Id.setConstructorName(Type.get(), NameLoc, RAngleLoc); 1605 else 1606 Id.setDestructorName(Id.StartLocation, Type.get(), RAngleLoc); 1607 1608 return false; 1609} 1610 1611/// \brief Parse an operator-function-id or conversion-function-id as part 1612/// of a C++ unqualified-id. 1613/// 1614/// This routine is responsible only for parsing the operator-function-id or 1615/// conversion-function-id; it does not handle template arguments in any way. 1616/// 1617/// \code 1618/// operator-function-id: [C++ 13.5] 1619/// 'operator' operator 1620/// 1621/// operator: one of 1622/// new delete new[] delete[] 1623/// + - * / % ^ & | ~ 1624/// ! = < > += -= *= /= %= 1625/// ^= &= |= << >> >>= <<= == != 1626/// <= >= && || ++ -- , ->* -> 1627/// () [] 1628/// 1629/// conversion-function-id: [C++ 12.3.2] 1630/// operator conversion-type-id 1631/// 1632/// conversion-type-id: 1633/// type-specifier-seq conversion-declarator[opt] 1634/// 1635/// conversion-declarator: 1636/// ptr-operator conversion-declarator[opt] 1637/// \endcode 1638/// 1639/// \param The nested-name-specifier that preceded this unqualified-id. If 1640/// non-empty, then we are parsing the unqualified-id of a qualified-id. 1641/// 1642/// \param EnteringContext whether we are entering the scope of the 1643/// nested-name-specifier. 1644/// 1645/// \param ObjectType if this unqualified-id occurs within a member access 1646/// expression, the type of the base object whose member is being accessed. 1647/// 1648/// \param Result on a successful parse, contains the parsed unqualified-id. 1649/// 1650/// \returns true if parsing fails, false otherwise. 1651bool Parser::ParseUnqualifiedIdOperator(CXXScopeSpec &SS, bool EnteringContext, 1652 ParsedType ObjectType, 1653 UnqualifiedId &Result) { 1654 assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword"); 1655 1656 // Consume the 'operator' keyword. 1657 SourceLocation KeywordLoc = ConsumeToken(); 1658 1659 // Determine what kind of operator name we have. 1660 unsigned SymbolIdx = 0; 1661 SourceLocation SymbolLocations[3]; 1662 OverloadedOperatorKind Op = OO_None; 1663 switch (Tok.getKind()) { 1664 case tok::kw_new: 1665 case tok::kw_delete: { 1666 bool isNew = Tok.getKind() == tok::kw_new; 1667 // Consume the 'new' or 'delete'. 1668 SymbolLocations[SymbolIdx++] = ConsumeToken(); 1669 if (Tok.is(tok::l_square)) { 1670 // Consume the '[' and ']'. 1671 BalancedDelimiterTracker T(*this, tok::l_square); 1672 T.consumeOpen(); 1673 T.consumeClose(); 1674 if (T.getCloseLocation().isInvalid()) 1675 return true; 1676 1677 SymbolLocations[SymbolIdx++] = T.getOpenLocation(); 1678 SymbolLocations[SymbolIdx++] = T.getCloseLocation(); 1679 Op = isNew? OO_Array_New : OO_Array_Delete; 1680 } else { 1681 Op = isNew? OO_New : OO_Delete; 1682 } 1683 break; 1684 } 1685 1686#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 1687 case tok::Token: \ 1688 SymbolLocations[SymbolIdx++] = ConsumeToken(); \ 1689 Op = OO_##Name; \ 1690 break; 1691#define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly) 1692#include "clang/Basic/OperatorKinds.def" 1693 1694 case tok::l_paren: { 1695 // Consume the '(' and ')'. 1696 BalancedDelimiterTracker T(*this, tok::l_paren); 1697 T.consumeOpen(); 1698 T.consumeClose(); 1699 if (T.getCloseLocation().isInvalid()) 1700 return true; 1701 1702 SymbolLocations[SymbolIdx++] = T.getOpenLocation(); 1703 SymbolLocations[SymbolIdx++] = T.getCloseLocation(); 1704 Op = OO_Call; 1705 break; 1706 } 1707 1708 case tok::l_square: { 1709 // Consume the '[' and ']'. 1710 BalancedDelimiterTracker T(*this, tok::l_square); 1711 T.consumeOpen(); 1712 T.consumeClose(); 1713 if (T.getCloseLocation().isInvalid()) 1714 return true; 1715 1716 SymbolLocations[SymbolIdx++] = T.getOpenLocation(); 1717 SymbolLocations[SymbolIdx++] = T.getCloseLocation(); 1718 Op = OO_Subscript; 1719 break; 1720 } 1721 1722 case tok::code_completion: { 1723 // Code completion for the operator name. 1724 Actions.CodeCompleteOperatorName(getCurScope()); 1725 cutOffParsing(); 1726 // Don't try to parse any further. 1727 return true; 1728 } 1729 1730 default: 1731 break; 1732 } 1733 1734 if (Op != OO_None) { 1735 // We have parsed an operator-function-id. 1736 Result.setOperatorFunctionId(KeywordLoc, Op, SymbolLocations); 1737 return false; 1738 } 1739 1740 // Parse a literal-operator-id. 1741 // 1742 // literal-operator-id: [C++0x 13.5.8] 1743 // operator "" identifier 1744 1745 if (getLang().CPlusPlus0x && Tok.is(tok::string_literal)) { 1746 if (Tok.getLength() != 2) 1747 Diag(Tok.getLocation(), diag::err_operator_string_not_empty); 1748 ConsumeStringToken(); 1749 1750 if (Tok.isNot(tok::identifier)) { 1751 Diag(Tok.getLocation(), diag::err_expected_ident); 1752 return true; 1753 } 1754 1755 IdentifierInfo *II = Tok.getIdentifierInfo(); 1756 Result.setLiteralOperatorId(II, KeywordLoc, ConsumeToken()); 1757 return false; 1758 } 1759 1760 // Parse a conversion-function-id. 1761 // 1762 // conversion-function-id: [C++ 12.3.2] 1763 // operator conversion-type-id 1764 // 1765 // conversion-type-id: 1766 // type-specifier-seq conversion-declarator[opt] 1767 // 1768 // conversion-declarator: 1769 // ptr-operator conversion-declarator[opt] 1770 1771 // Parse the type-specifier-seq. 1772 DeclSpec DS(AttrFactory); 1773 if (ParseCXXTypeSpecifierSeq(DS)) // FIXME: ObjectType? 1774 return true; 1775 1776 // Parse the conversion-declarator, which is merely a sequence of 1777 // ptr-operators. 1778 Declarator D(DS, Declarator::TypeNameContext); 1779 ParseDeclaratorInternal(D, /*DirectDeclParser=*/0); 1780 1781 // Finish up the type. 1782 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), D); 1783 if (Ty.isInvalid()) 1784 return true; 1785 1786 // Note that this is a conversion-function-id. 1787 Result.setConversionFunctionId(KeywordLoc, Ty.get(), 1788 D.getSourceRange().getEnd()); 1789 return false; 1790} 1791 1792/// \brief Parse a C++ unqualified-id (or a C identifier), which describes the 1793/// name of an entity. 1794/// 1795/// \code 1796/// unqualified-id: [C++ expr.prim.general] 1797/// identifier 1798/// operator-function-id 1799/// conversion-function-id 1800/// [C++0x] literal-operator-id [TODO] 1801/// ~ class-name 1802/// template-id 1803/// 1804/// \endcode 1805/// 1806/// \param The nested-name-specifier that preceded this unqualified-id. If 1807/// non-empty, then we are parsing the unqualified-id of a qualified-id. 1808/// 1809/// \param EnteringContext whether we are entering the scope of the 1810/// nested-name-specifier. 1811/// 1812/// \param AllowDestructorName whether we allow parsing of a destructor name. 1813/// 1814/// \param AllowConstructorName whether we allow parsing a constructor name. 1815/// 1816/// \param ObjectType if this unqualified-id occurs within a member access 1817/// expression, the type of the base object whose member is being accessed. 1818/// 1819/// \param Result on a successful parse, contains the parsed unqualified-id. 1820/// 1821/// \returns true if parsing fails, false otherwise. 1822bool Parser::ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext, 1823 bool AllowDestructorName, 1824 bool AllowConstructorName, 1825 ParsedType ObjectType, 1826 UnqualifiedId &Result) { 1827 1828 // Handle 'A::template B'. This is for template-ids which have not 1829 // already been annotated by ParseOptionalCXXScopeSpecifier(). 1830 bool TemplateSpecified = false; 1831 SourceLocation TemplateKWLoc; 1832 if (getLang().CPlusPlus && Tok.is(tok::kw_template) && 1833 (ObjectType || SS.isSet())) { 1834 TemplateSpecified = true; 1835 TemplateKWLoc = ConsumeToken(); 1836 } 1837 1838 // unqualified-id: 1839 // identifier 1840 // template-id (when it hasn't already been annotated) 1841 if (Tok.is(tok::identifier)) { 1842 // Consume the identifier. 1843 IdentifierInfo *Id = Tok.getIdentifierInfo(); 1844 SourceLocation IdLoc = ConsumeToken(); 1845 1846 if (!getLang().CPlusPlus) { 1847 // If we're not in C++, only identifiers matter. Record the 1848 // identifier and return. 1849 Result.setIdentifier(Id, IdLoc); 1850 return false; 1851 } 1852 1853 if (AllowConstructorName && 1854 Actions.isCurrentClassName(*Id, getCurScope(), &SS)) { 1855 // We have parsed a constructor name. 1856 Result.setConstructorName(Actions.getTypeName(*Id, IdLoc, getCurScope(), 1857 &SS, false, false, 1858 ParsedType(), 1859 /*NonTrivialTypeSourceInfo=*/true), 1860 IdLoc, IdLoc); 1861 } else { 1862 // We have parsed an identifier. 1863 Result.setIdentifier(Id, IdLoc); 1864 } 1865 1866 // If the next token is a '<', we may have a template. 1867 if (TemplateSpecified || Tok.is(tok::less)) 1868 return ParseUnqualifiedIdTemplateId(SS, Id, IdLoc, EnteringContext, 1869 ObjectType, Result, 1870 TemplateSpecified, TemplateKWLoc); 1871 1872 return false; 1873 } 1874 1875 // unqualified-id: 1876 // template-id (already parsed and annotated) 1877 if (Tok.is(tok::annot_template_id)) { 1878 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 1879 1880 // If the template-name names the current class, then this is a constructor 1881 if (AllowConstructorName && TemplateId->Name && 1882 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) { 1883 if (SS.isSet()) { 1884 // C++ [class.qual]p2 specifies that a qualified template-name 1885 // is taken as the constructor name where a constructor can be 1886 // declared. Thus, the template arguments are extraneous, so 1887 // complain about them and remove them entirely. 1888 Diag(TemplateId->TemplateNameLoc, 1889 diag::err_out_of_line_constructor_template_id) 1890 << TemplateId->Name 1891 << FixItHint::CreateRemoval( 1892 SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)); 1893 Result.setConstructorName(Actions.getTypeName(*TemplateId->Name, 1894 TemplateId->TemplateNameLoc, 1895 getCurScope(), 1896 &SS, false, false, 1897 ParsedType(), 1898 /*NontrivialTypeSourceInfo=*/true), 1899 TemplateId->TemplateNameLoc, 1900 TemplateId->RAngleLoc); 1901 ConsumeToken(); 1902 return false; 1903 } 1904 1905 Result.setConstructorTemplateId(TemplateId); 1906 ConsumeToken(); 1907 return false; 1908 } 1909 1910 // We have already parsed a template-id; consume the annotation token as 1911 // our unqualified-id. 1912 Result.setTemplateId(TemplateId); 1913 ConsumeToken(); 1914 return false; 1915 } 1916 1917 // unqualified-id: 1918 // operator-function-id 1919 // conversion-function-id 1920 if (Tok.is(tok::kw_operator)) { 1921 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, Result)) 1922 return true; 1923 1924 // If we have an operator-function-id or a literal-operator-id and the next 1925 // token is a '<', we may have a 1926 // 1927 // template-id: 1928 // operator-function-id < template-argument-list[opt] > 1929 if ((Result.getKind() == UnqualifiedId::IK_OperatorFunctionId || 1930 Result.getKind() == UnqualifiedId::IK_LiteralOperatorId) && 1931 (TemplateSpecified || Tok.is(tok::less))) 1932 return ParseUnqualifiedIdTemplateId(SS, 0, SourceLocation(), 1933 EnteringContext, ObjectType, 1934 Result, 1935 TemplateSpecified, TemplateKWLoc); 1936 1937 return false; 1938 } 1939 1940 if (getLang().CPlusPlus && 1941 (AllowDestructorName || SS.isSet()) && Tok.is(tok::tilde)) { 1942 // C++ [expr.unary.op]p10: 1943 // There is an ambiguity in the unary-expression ~X(), where X is a 1944 // class-name. The ambiguity is resolved in favor of treating ~ as a 1945 // unary complement rather than treating ~X as referring to a destructor. 1946 1947 // Parse the '~'. 1948 SourceLocation TildeLoc = ConsumeToken(); 1949 1950 // Parse the class-name. 1951 if (Tok.isNot(tok::identifier)) { 1952 Diag(Tok, diag::err_destructor_tilde_identifier); 1953 return true; 1954 } 1955 1956 // Parse the class-name (or template-name in a simple-template-id). 1957 IdentifierInfo *ClassName = Tok.getIdentifierInfo(); 1958 SourceLocation ClassNameLoc = ConsumeToken(); 1959 1960 if (TemplateSpecified || Tok.is(tok::less)) { 1961 Result.setDestructorName(TildeLoc, ParsedType(), ClassNameLoc); 1962 return ParseUnqualifiedIdTemplateId(SS, ClassName, ClassNameLoc, 1963 EnteringContext, ObjectType, Result, 1964 TemplateSpecified, TemplateKWLoc); 1965 } 1966 1967 // Note that this is a destructor name. 1968 ParsedType Ty = Actions.getDestructorName(TildeLoc, *ClassName, 1969 ClassNameLoc, getCurScope(), 1970 SS, ObjectType, 1971 EnteringContext); 1972 if (!Ty) 1973 return true; 1974 1975 Result.setDestructorName(TildeLoc, Ty, ClassNameLoc); 1976 return false; 1977 } 1978 1979 Diag(Tok, diag::err_expected_unqualified_id) 1980 << getLang().CPlusPlus; 1981 return true; 1982} 1983 1984/// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate 1985/// memory in a typesafe manner and call constructors. 1986/// 1987/// This method is called to parse the new expression after the optional :: has 1988/// been already parsed. If the :: was present, "UseGlobal" is true and "Start" 1989/// is its location. Otherwise, "Start" is the location of the 'new' token. 1990/// 1991/// new-expression: 1992/// '::'[opt] 'new' new-placement[opt] new-type-id 1993/// new-initializer[opt] 1994/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 1995/// new-initializer[opt] 1996/// 1997/// new-placement: 1998/// '(' expression-list ')' 1999/// 2000/// new-type-id: 2001/// type-specifier-seq new-declarator[opt] 2002/// [GNU] attributes type-specifier-seq new-declarator[opt] 2003/// 2004/// new-declarator: 2005/// ptr-operator new-declarator[opt] 2006/// direct-new-declarator 2007/// 2008/// new-initializer: 2009/// '(' expression-list[opt] ')' 2010/// [C++0x] braced-init-list 2011/// 2012ExprResult 2013Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) { 2014 assert(Tok.is(tok::kw_new) && "expected 'new' token"); 2015 ConsumeToken(); // Consume 'new' 2016 2017 // A '(' now can be a new-placement or the '(' wrapping the type-id in the 2018 // second form of new-expression. It can't be a new-type-id. 2019 2020 ExprVector PlacementArgs(Actions); 2021 SourceLocation PlacementLParen, PlacementRParen; 2022 2023 SourceRange TypeIdParens; 2024 DeclSpec DS(AttrFactory); 2025 Declarator DeclaratorInfo(DS, Declarator::CXXNewContext); 2026 if (Tok.is(tok::l_paren)) { 2027 // If it turns out to be a placement, we change the type location. 2028 BalancedDelimiterTracker T(*this, tok::l_paren); 2029 T.consumeOpen(); 2030 PlacementLParen = T.getOpenLocation(); 2031 if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) { 2032 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2033 return ExprError(); 2034 } 2035 2036 T.consumeClose(); 2037 PlacementRParen = T.getCloseLocation(); 2038 if (PlacementRParen.isInvalid()) { 2039 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2040 return ExprError(); 2041 } 2042 2043 if (PlacementArgs.empty()) { 2044 // Reset the placement locations. There was no placement. 2045 TypeIdParens = T.getRange(); 2046 PlacementLParen = PlacementRParen = SourceLocation(); 2047 } else { 2048 // We still need the type. 2049 if (Tok.is(tok::l_paren)) { 2050 BalancedDelimiterTracker T(*this, tok::l_paren); 2051 T.consumeOpen(); 2052 MaybeParseGNUAttributes(DeclaratorInfo); 2053 ParseSpecifierQualifierList(DS); 2054 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 2055 ParseDeclarator(DeclaratorInfo); 2056 T.consumeClose(); 2057 TypeIdParens = T.getRange(); 2058 } else { 2059 MaybeParseGNUAttributes(DeclaratorInfo); 2060 if (ParseCXXTypeSpecifierSeq(DS)) 2061 DeclaratorInfo.setInvalidType(true); 2062 else { 2063 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 2064 ParseDeclaratorInternal(DeclaratorInfo, 2065 &Parser::ParseDirectNewDeclarator); 2066 } 2067 } 2068 } 2069 } else { 2070 // A new-type-id is a simplified type-id, where essentially the 2071 // direct-declarator is replaced by a direct-new-declarator. 2072 MaybeParseGNUAttributes(DeclaratorInfo); 2073 if (ParseCXXTypeSpecifierSeq(DS)) 2074 DeclaratorInfo.setInvalidType(true); 2075 else { 2076 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 2077 ParseDeclaratorInternal(DeclaratorInfo, 2078 &Parser::ParseDirectNewDeclarator); 2079 } 2080 } 2081 if (DeclaratorInfo.isInvalidType()) { 2082 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2083 return ExprError(); 2084 } 2085 2086 ExprVector ConstructorArgs(Actions); 2087 SourceLocation ConstructorLParen, ConstructorRParen; 2088 2089 if (Tok.is(tok::l_paren)) { 2090 BalancedDelimiterTracker T(*this, tok::l_paren); 2091 T.consumeOpen(); 2092 ConstructorLParen = T.getOpenLocation(); 2093 if (Tok.isNot(tok::r_paren)) { 2094 CommaLocsTy CommaLocs; 2095 if (ParseExpressionList(ConstructorArgs, CommaLocs)) { 2096 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2097 return ExprError(); 2098 } 2099 } 2100 T.consumeClose(); 2101 ConstructorRParen = T.getCloseLocation(); 2102 if (ConstructorRParen.isInvalid()) { 2103 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2104 return ExprError(); 2105 } 2106 } else if (Tok.is(tok::l_brace) && getLang().CPlusPlus0x) { 2107 // FIXME: Have to communicate the init-list to ActOnCXXNew. 2108 ParseBraceInitializer(); 2109 } 2110 2111 return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen, 2112 move_arg(PlacementArgs), PlacementRParen, 2113 TypeIdParens, DeclaratorInfo, ConstructorLParen, 2114 move_arg(ConstructorArgs), ConstructorRParen); 2115} 2116 2117/// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be 2118/// passed to ParseDeclaratorInternal. 2119/// 2120/// direct-new-declarator: 2121/// '[' expression ']' 2122/// direct-new-declarator '[' constant-expression ']' 2123/// 2124void Parser::ParseDirectNewDeclarator(Declarator &D) { 2125 // Parse the array dimensions. 2126 bool first = true; 2127 while (Tok.is(tok::l_square)) { 2128 BalancedDelimiterTracker T(*this, tok::l_square); 2129 T.consumeOpen(); 2130 2131 ExprResult Size(first ? ParseExpression() 2132 : ParseConstantExpression()); 2133 if (Size.isInvalid()) { 2134 // Recover 2135 SkipUntil(tok::r_square); 2136 return; 2137 } 2138 first = false; 2139 2140 T.consumeClose(); 2141 2142 ParsedAttributes attrs(AttrFactory); 2143 D.AddTypeInfo(DeclaratorChunk::getArray(0, 2144 /*static=*/false, /*star=*/false, 2145 Size.release(), 2146 T.getOpenLocation(), 2147 T.getCloseLocation()), 2148 attrs, T.getCloseLocation()); 2149 2150 if (T.getCloseLocation().isInvalid()) 2151 return; 2152 } 2153} 2154 2155/// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id. 2156/// This ambiguity appears in the syntax of the C++ new operator. 2157/// 2158/// new-expression: 2159/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 2160/// new-initializer[opt] 2161/// 2162/// new-placement: 2163/// '(' expression-list ')' 2164/// 2165bool Parser::ParseExpressionListOrTypeId( 2166 SmallVectorImpl<Expr*> &PlacementArgs, 2167 Declarator &D) { 2168 // The '(' was already consumed. 2169 if (isTypeIdInParens()) { 2170 ParseSpecifierQualifierList(D.getMutableDeclSpec()); 2171 D.SetSourceRange(D.getDeclSpec().getSourceRange()); 2172 ParseDeclarator(D); 2173 return D.isInvalidType(); 2174 } 2175 2176 // It's not a type, it has to be an expression list. 2177 // Discard the comma locations - ActOnCXXNew has enough parameters. 2178 CommaLocsTy CommaLocs; 2179 return ParseExpressionList(PlacementArgs, CommaLocs); 2180} 2181 2182/// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used 2183/// to free memory allocated by new. 2184/// 2185/// This method is called to parse the 'delete' expression after the optional 2186/// '::' has been already parsed. If the '::' was present, "UseGlobal" is true 2187/// and "Start" is its location. Otherwise, "Start" is the location of the 2188/// 'delete' token. 2189/// 2190/// delete-expression: 2191/// '::'[opt] 'delete' cast-expression 2192/// '::'[opt] 'delete' '[' ']' cast-expression 2193ExprResult 2194Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) { 2195 assert(Tok.is(tok::kw_delete) && "Expected 'delete' keyword"); 2196 ConsumeToken(); // Consume 'delete' 2197 2198 // Array delete? 2199 bool ArrayDelete = false; 2200 if (Tok.is(tok::l_square)) { 2201 ArrayDelete = true; 2202 BalancedDelimiterTracker T(*this, tok::l_square); 2203 2204 T.consumeOpen(); 2205 T.consumeClose(); 2206 if (T.getCloseLocation().isInvalid()) 2207 return ExprError(); 2208 } 2209 2210 ExprResult Operand(ParseCastExpression(false)); 2211 if (Operand.isInvalid()) 2212 return move(Operand); 2213 2214 return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, Operand.take()); 2215} 2216 2217static UnaryTypeTrait UnaryTypeTraitFromTokKind(tok::TokenKind kind) { 2218 switch(kind) { 2219 default: llvm_unreachable("Not a known unary type trait."); 2220 case tok::kw___has_nothrow_assign: return UTT_HasNothrowAssign; 2221 case tok::kw___has_nothrow_constructor: return UTT_HasNothrowConstructor; 2222 case tok::kw___has_nothrow_copy: return UTT_HasNothrowCopy; 2223 case tok::kw___has_trivial_assign: return UTT_HasTrivialAssign; 2224 case tok::kw___has_trivial_constructor: 2225 return UTT_HasTrivialDefaultConstructor; 2226 case tok::kw___has_trivial_copy: return UTT_HasTrivialCopy; 2227 case tok::kw___has_trivial_destructor: return UTT_HasTrivialDestructor; 2228 case tok::kw___has_virtual_destructor: return UTT_HasVirtualDestructor; 2229 case tok::kw___is_abstract: return UTT_IsAbstract; 2230 case tok::kw___is_arithmetic: return UTT_IsArithmetic; 2231 case tok::kw___is_array: return UTT_IsArray; 2232 case tok::kw___is_class: return UTT_IsClass; 2233 case tok::kw___is_complete_type: return UTT_IsCompleteType; 2234 case tok::kw___is_compound: return UTT_IsCompound; 2235 case tok::kw___is_const: return UTT_IsConst; 2236 case tok::kw___is_empty: return UTT_IsEmpty; 2237 case tok::kw___is_enum: return UTT_IsEnum; 2238 case tok::kw___is_floating_point: return UTT_IsFloatingPoint; 2239 case tok::kw___is_function: return UTT_IsFunction; 2240 case tok::kw___is_fundamental: return UTT_IsFundamental; 2241 case tok::kw___is_integral: return UTT_IsIntegral; 2242 case tok::kw___is_lvalue_reference: return UTT_IsLvalueReference; 2243 case tok::kw___is_member_function_pointer: return UTT_IsMemberFunctionPointer; 2244 case tok::kw___is_member_object_pointer: return UTT_IsMemberObjectPointer; 2245 case tok::kw___is_member_pointer: return UTT_IsMemberPointer; 2246 case tok::kw___is_object: return UTT_IsObject; 2247 case tok::kw___is_literal: return UTT_IsLiteral; 2248 case tok::kw___is_literal_type: return UTT_IsLiteral; 2249 case tok::kw___is_pod: return UTT_IsPOD; 2250 case tok::kw___is_pointer: return UTT_IsPointer; 2251 case tok::kw___is_polymorphic: return UTT_IsPolymorphic; 2252 case tok::kw___is_reference: return UTT_IsReference; 2253 case tok::kw___is_rvalue_reference: return UTT_IsRvalueReference; 2254 case tok::kw___is_scalar: return UTT_IsScalar; 2255 case tok::kw___is_signed: return UTT_IsSigned; 2256 case tok::kw___is_standard_layout: return UTT_IsStandardLayout; 2257 case tok::kw___is_trivial: return UTT_IsTrivial; 2258 case tok::kw___is_trivially_copyable: return UTT_IsTriviallyCopyable; 2259 case tok::kw___is_union: return UTT_IsUnion; 2260 case tok::kw___is_unsigned: return UTT_IsUnsigned; 2261 case tok::kw___is_void: return UTT_IsVoid; 2262 case tok::kw___is_volatile: return UTT_IsVolatile; 2263 } 2264} 2265 2266static BinaryTypeTrait BinaryTypeTraitFromTokKind(tok::TokenKind kind) { 2267 switch(kind) { 2268 default: llvm_unreachable("Not a known binary type trait"); 2269 case tok::kw___is_base_of: return BTT_IsBaseOf; 2270 case tok::kw___is_convertible: return BTT_IsConvertible; 2271 case tok::kw___is_same: return BTT_IsSame; 2272 case tok::kw___builtin_types_compatible_p: return BTT_TypeCompatible; 2273 case tok::kw___is_convertible_to: return BTT_IsConvertibleTo; 2274 } 2275} 2276 2277static ArrayTypeTrait ArrayTypeTraitFromTokKind(tok::TokenKind kind) { 2278 switch(kind) { 2279 default: llvm_unreachable("Not a known binary type trait"); 2280 case tok::kw___array_rank: return ATT_ArrayRank; 2281 case tok::kw___array_extent: return ATT_ArrayExtent; 2282 } 2283} 2284 2285static ExpressionTrait ExpressionTraitFromTokKind(tok::TokenKind kind) { 2286 switch(kind) { 2287 default: llvm_unreachable("Not a known unary expression trait."); 2288 case tok::kw___is_lvalue_expr: return ET_IsLValueExpr; 2289 case tok::kw___is_rvalue_expr: return ET_IsRValueExpr; 2290 } 2291} 2292 2293/// ParseUnaryTypeTrait - Parse the built-in unary type-trait 2294/// pseudo-functions that allow implementation of the TR1/C++0x type traits 2295/// templates. 2296/// 2297/// primary-expression: 2298/// [GNU] unary-type-trait '(' type-id ')' 2299/// 2300ExprResult Parser::ParseUnaryTypeTrait() { 2301 UnaryTypeTrait UTT = UnaryTypeTraitFromTokKind(Tok.getKind()); 2302 SourceLocation Loc = ConsumeToken(); 2303 2304 BalancedDelimiterTracker T(*this, tok::l_paren); 2305 if (T.expectAndConsume(diag::err_expected_lparen)) 2306 return ExprError(); 2307 2308 // FIXME: Error reporting absolutely sucks! If the this fails to parse a type 2309 // there will be cryptic errors about mismatched parentheses and missing 2310 // specifiers. 2311 TypeResult Ty = ParseTypeName(); 2312 2313 T.consumeClose(); 2314 2315 if (Ty.isInvalid()) 2316 return ExprError(); 2317 2318 return Actions.ActOnUnaryTypeTrait(UTT, Loc, Ty.get(), T.getCloseLocation()); 2319} 2320 2321/// ParseBinaryTypeTrait - Parse the built-in binary type-trait 2322/// pseudo-functions that allow implementation of the TR1/C++0x type traits 2323/// templates. 2324/// 2325/// primary-expression: 2326/// [GNU] binary-type-trait '(' type-id ',' type-id ')' 2327/// 2328ExprResult Parser::ParseBinaryTypeTrait() { 2329 BinaryTypeTrait BTT = BinaryTypeTraitFromTokKind(Tok.getKind()); 2330 SourceLocation Loc = ConsumeToken(); 2331 2332 BalancedDelimiterTracker T(*this, tok::l_paren); 2333 if (T.expectAndConsume(diag::err_expected_lparen)) 2334 return ExprError(); 2335 2336 TypeResult LhsTy = ParseTypeName(); 2337 if (LhsTy.isInvalid()) { 2338 SkipUntil(tok::r_paren); 2339 return ExprError(); 2340 } 2341 2342 if (ExpectAndConsume(tok::comma, diag::err_expected_comma)) { 2343 SkipUntil(tok::r_paren); 2344 return ExprError(); 2345 } 2346 2347 TypeResult RhsTy = ParseTypeName(); 2348 if (RhsTy.isInvalid()) { 2349 SkipUntil(tok::r_paren); 2350 return ExprError(); 2351 } 2352 2353 T.consumeClose(); 2354 2355 return Actions.ActOnBinaryTypeTrait(BTT, Loc, LhsTy.get(), RhsTy.get(), 2356 T.getCloseLocation()); 2357} 2358 2359/// ParseArrayTypeTrait - Parse the built-in array type-trait 2360/// pseudo-functions. 2361/// 2362/// primary-expression: 2363/// [Embarcadero] '__array_rank' '(' type-id ')' 2364/// [Embarcadero] '__array_extent' '(' type-id ',' expression ')' 2365/// 2366ExprResult Parser::ParseArrayTypeTrait() { 2367 ArrayTypeTrait ATT = ArrayTypeTraitFromTokKind(Tok.getKind()); 2368 SourceLocation Loc = ConsumeToken(); 2369 2370 BalancedDelimiterTracker T(*this, tok::l_paren); 2371 if (T.expectAndConsume(diag::err_expected_lparen)) 2372 return ExprError(); 2373 2374 TypeResult Ty = ParseTypeName(); 2375 if (Ty.isInvalid()) { 2376 SkipUntil(tok::comma); 2377 SkipUntil(tok::r_paren); 2378 return ExprError(); 2379 } 2380 2381 switch (ATT) { 2382 case ATT_ArrayRank: { 2383 T.consumeClose(); 2384 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), NULL, 2385 T.getCloseLocation()); 2386 } 2387 case ATT_ArrayExtent: { 2388 if (ExpectAndConsume(tok::comma, diag::err_expected_comma)) { 2389 SkipUntil(tok::r_paren); 2390 return ExprError(); 2391 } 2392 2393 ExprResult DimExpr = ParseExpression(); 2394 T.consumeClose(); 2395 2396 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), DimExpr.get(), 2397 T.getCloseLocation()); 2398 } 2399 default: 2400 break; 2401 } 2402 return ExprError(); 2403} 2404 2405/// ParseExpressionTrait - Parse built-in expression-trait 2406/// pseudo-functions like __is_lvalue_expr( xxx ). 2407/// 2408/// primary-expression: 2409/// [Embarcadero] expression-trait '(' expression ')' 2410/// 2411ExprResult Parser::ParseExpressionTrait() { 2412 ExpressionTrait ET = ExpressionTraitFromTokKind(Tok.getKind()); 2413 SourceLocation Loc = ConsumeToken(); 2414 2415 BalancedDelimiterTracker T(*this, tok::l_paren); 2416 if (T.expectAndConsume(diag::err_expected_lparen)) 2417 return ExprError(); 2418 2419 ExprResult Expr = ParseExpression(); 2420 2421 T.consumeClose(); 2422 2423 return Actions.ActOnExpressionTrait(ET, Loc, Expr.get(), 2424 T.getCloseLocation()); 2425} 2426 2427 2428/// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a 2429/// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate 2430/// based on the context past the parens. 2431ExprResult 2432Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType, 2433 ParsedType &CastTy, 2434 BalancedDelimiterTracker &Tracker) { 2435 assert(getLang().CPlusPlus && "Should only be called for C++!"); 2436 assert(ExprType == CastExpr && "Compound literals are not ambiguous!"); 2437 assert(isTypeIdInParens() && "Not a type-id!"); 2438 2439 ExprResult Result(true); 2440 CastTy = ParsedType(); 2441 2442 // We need to disambiguate a very ugly part of the C++ syntax: 2443 // 2444 // (T())x; - type-id 2445 // (T())*x; - type-id 2446 // (T())/x; - expression 2447 // (T()); - expression 2448 // 2449 // The bad news is that we cannot use the specialized tentative parser, since 2450 // it can only verify that the thing inside the parens can be parsed as 2451 // type-id, it is not useful for determining the context past the parens. 2452 // 2453 // The good news is that the parser can disambiguate this part without 2454 // making any unnecessary Action calls. 2455 // 2456 // It uses a scheme similar to parsing inline methods. The parenthesized 2457 // tokens are cached, the context that follows is determined (possibly by 2458 // parsing a cast-expression), and then we re-introduce the cached tokens 2459 // into the token stream and parse them appropriately. 2460 2461 ParenParseOption ParseAs; 2462 CachedTokens Toks; 2463 2464 // Store the tokens of the parentheses. We will parse them after we determine 2465 // the context that follows them. 2466 if (!ConsumeAndStoreUntil(tok::r_paren, Toks)) { 2467 // We didn't find the ')' we expected. 2468 Tracker.consumeClose(); 2469 return ExprError(); 2470 } 2471 2472 if (Tok.is(tok::l_brace)) { 2473 ParseAs = CompoundLiteral; 2474 } else { 2475 bool NotCastExpr; 2476 // FIXME: Special-case ++ and --: "(S())++;" is not a cast-expression 2477 if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) { 2478 NotCastExpr = true; 2479 } else { 2480 // Try parsing the cast-expression that may follow. 2481 // If it is not a cast-expression, NotCastExpr will be true and no token 2482 // will be consumed. 2483 Result = ParseCastExpression(false/*isUnaryExpression*/, 2484 false/*isAddressofOperand*/, 2485 NotCastExpr, 2486 // type-id has priority. 2487 true/*isTypeCast*/); 2488 } 2489 2490 // If we parsed a cast-expression, it's really a type-id, otherwise it's 2491 // an expression. 2492 ParseAs = NotCastExpr ? SimpleExpr : CastExpr; 2493 } 2494 2495 // The current token should go after the cached tokens. 2496 Toks.push_back(Tok); 2497 // Re-enter the stored parenthesized tokens into the token stream, so we may 2498 // parse them now. 2499 PP.EnterTokenStream(Toks.data(), Toks.size(), 2500 true/*DisableMacroExpansion*/, false/*OwnsTokens*/); 2501 // Drop the current token and bring the first cached one. It's the same token 2502 // as when we entered this function. 2503 ConsumeAnyToken(); 2504 2505 if (ParseAs >= CompoundLiteral) { 2506 // Parse the type declarator. 2507 DeclSpec DS(AttrFactory); 2508 ParseSpecifierQualifierList(DS); 2509 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 2510 ParseDeclarator(DeclaratorInfo); 2511 2512 // Match the ')'. 2513 Tracker.consumeClose(); 2514 2515 if (ParseAs == CompoundLiteral) { 2516 ExprType = CompoundLiteral; 2517 TypeResult Ty = ParseTypeName(); 2518 return ParseCompoundLiteralExpression(Ty.get(), 2519 Tracker.getOpenLocation(), 2520 Tracker.getCloseLocation()); 2521 } 2522 2523 // We parsed '(' type-id ')' and the thing after it wasn't a '{'. 2524 assert(ParseAs == CastExpr); 2525 2526 if (DeclaratorInfo.isInvalidType()) 2527 return ExprError(); 2528 2529 // Result is what ParseCastExpression returned earlier. 2530 if (!Result.isInvalid()) 2531 Result = Actions.ActOnCastExpr(getCurScope(), Tracker.getOpenLocation(), 2532 DeclaratorInfo, CastTy, 2533 Tracker.getCloseLocation(), Result.take()); 2534 return move(Result); 2535 } 2536 2537 // Not a compound literal, and not followed by a cast-expression. 2538 assert(ParseAs == SimpleExpr); 2539 2540 ExprType = SimpleExpr; 2541 Result = ParseExpression(); 2542 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 2543 Result = Actions.ActOnParenExpr(Tracker.getOpenLocation(), 2544 Tok.getLocation(), Result.take()); 2545 2546 // Match the ')'. 2547 if (Result.isInvalid()) { 2548 SkipUntil(tok::r_paren); 2549 return ExprError(); 2550 } 2551 2552 Tracker.consumeClose(); 2553 return move(Result); 2554} 2555