ParseExprCXX.cpp revision 54655be65585ed6618fdd7a19fa6c70efc321d3a
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/Basic/PrettyStackTrace.h" 18#include "clang/Lex/LiteralSupport.h" 19#include "clang/Sema/DeclSpec.h" 20#include "clang/Sema/Scope.h" 21#include "clang/Sema/ParsedTemplate.h" 22#include "llvm/Support/ErrorHandling.h" 23 24using namespace clang; 25 26static int SelectDigraphErrorMessage(tok::TokenKind Kind) { 27 switch (Kind) { 28 case tok::kw_template: return 0; 29 case tok::kw_const_cast: return 1; 30 case tok::kw_dynamic_cast: return 2; 31 case tok::kw_reinterpret_cast: return 3; 32 case tok::kw_static_cast: return 4; 33 default: 34 llvm_unreachable("Unknown type for digraph error message."); 35 } 36} 37 38// Are the two tokens adjacent in the same source file? 39static bool AreTokensAdjacent(Preprocessor &PP, Token &First, Token &Second) { 40 SourceManager &SM = PP.getSourceManager(); 41 SourceLocation FirstLoc = SM.getSpellingLoc(First.getLocation()); 42 SourceLocation FirstEnd = FirstLoc.getLocWithOffset(First.getLength()); 43 return FirstEnd == SM.getSpellingLoc(Second.getLocation()); 44} 45 46// Suggest fixit for "<::" after a cast. 47static void FixDigraph(Parser &P, Preprocessor &PP, Token &DigraphToken, 48 Token &ColonToken, tok::TokenKind Kind, bool AtDigraph) { 49 // Pull '<:' and ':' off token stream. 50 if (!AtDigraph) 51 PP.Lex(DigraphToken); 52 PP.Lex(ColonToken); 53 54 SourceRange Range; 55 Range.setBegin(DigraphToken.getLocation()); 56 Range.setEnd(ColonToken.getLocation()); 57 P.Diag(DigraphToken.getLocation(), diag::err_missing_whitespace_digraph) 58 << SelectDigraphErrorMessage(Kind) 59 << FixItHint::CreateReplacement(Range, "< ::"); 60 61 // Update token information to reflect their change in token type. 62 ColonToken.setKind(tok::coloncolon); 63 ColonToken.setLocation(ColonToken.getLocation().getLocWithOffset(-1)); 64 ColonToken.setLength(2); 65 DigraphToken.setKind(tok::less); 66 DigraphToken.setLength(1); 67 68 // Push new tokens back to token stream. 69 PP.EnterToken(ColonToken); 70 if (!AtDigraph) 71 PP.EnterToken(DigraphToken); 72} 73 74// Check for '<::' which should be '< ::' instead of '[:' when following 75// a template name. 76void Parser::CheckForTemplateAndDigraph(Token &Next, ParsedType ObjectType, 77 bool EnteringContext, 78 IdentifierInfo &II, CXXScopeSpec &SS) { 79 if (!Next.is(tok::l_square) || Next.getLength() != 2) 80 return; 81 82 Token SecondToken = GetLookAheadToken(2); 83 if (!SecondToken.is(tok::colon) || !AreTokensAdjacent(PP, Next, SecondToken)) 84 return; 85 86 TemplateTy Template; 87 UnqualifiedId TemplateName; 88 TemplateName.setIdentifier(&II, Tok.getLocation()); 89 bool MemberOfUnknownSpecialization; 90 if (!Actions.isTemplateName(getCurScope(), SS, /*hasTemplateKeyword=*/false, 91 TemplateName, ObjectType, EnteringContext, 92 Template, MemberOfUnknownSpecialization)) 93 return; 94 95 FixDigraph(*this, PP, Next, SecondToken, tok::kw_template, 96 /*AtDigraph*/false); 97} 98 99/// \brief Parse global scope or nested-name-specifier if present. 100/// 101/// Parses a C++ global scope specifier ('::') or nested-name-specifier (which 102/// may be preceded by '::'). Note that this routine will not parse ::new or 103/// ::delete; it will just leave them in the token stream. 104/// 105/// '::'[opt] nested-name-specifier 106/// '::' 107/// 108/// nested-name-specifier: 109/// type-name '::' 110/// namespace-name '::' 111/// nested-name-specifier identifier '::' 112/// nested-name-specifier 'template'[opt] simple-template-id '::' 113/// 114/// 115/// \param SS the scope specifier that will be set to the parsed 116/// nested-name-specifier (or empty) 117/// 118/// \param ObjectType if this nested-name-specifier is being parsed following 119/// the "." or "->" of a member access expression, this parameter provides the 120/// type of the object whose members are being accessed. 121/// 122/// \param EnteringContext whether we will be entering into the context of 123/// the nested-name-specifier after parsing it. 124/// 125/// \param MayBePseudoDestructor When non-NULL, points to a flag that 126/// indicates whether this nested-name-specifier may be part of a 127/// pseudo-destructor name. In this case, the flag will be set false 128/// if we don't actually end up parsing a destructor name. Moreorover, 129/// if we do end up determining that we are parsing a destructor name, 130/// the last component of the nested-name-specifier is not parsed as 131/// part of the scope specifier. 132 133/// member access expression, e.g., the \p T:: in \p p->T::m. 134/// 135/// \returns true if there was an error parsing a scope specifier 136bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS, 137 ParsedType ObjectType, 138 bool EnteringContext, 139 bool *MayBePseudoDestructor, 140 bool IsTypename) { 141 assert(getLangOpts().CPlusPlus && 142 "Call sites of this function should be guarded by checking for C++"); 143 144 if (Tok.is(tok::annot_cxxscope)) { 145 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(), 146 Tok.getAnnotationRange(), 147 SS); 148 ConsumeToken(); 149 return false; 150 } 151 152 bool HasScopeSpecifier = false; 153 154 if (Tok.is(tok::coloncolon)) { 155 // ::new and ::delete aren't nested-name-specifiers. 156 tok::TokenKind NextKind = NextToken().getKind(); 157 if (NextKind == tok::kw_new || NextKind == tok::kw_delete) 158 return false; 159 160 // '::' - Global scope qualifier. 161 if (Actions.ActOnCXXGlobalScopeSpecifier(getCurScope(), ConsumeToken(), SS)) 162 return true; 163 164 HasScopeSpecifier = true; 165 } 166 167 bool CheckForDestructor = false; 168 if (MayBePseudoDestructor && *MayBePseudoDestructor) { 169 CheckForDestructor = true; 170 *MayBePseudoDestructor = false; 171 } 172 173 if (Tok.is(tok::kw_decltype) || Tok.is(tok::annot_decltype)) { 174 DeclSpec DS(AttrFactory); 175 SourceLocation DeclLoc = Tok.getLocation(); 176 SourceLocation EndLoc = ParseDecltypeSpecifier(DS); 177 if (Tok.isNot(tok::coloncolon)) { 178 AnnotateExistingDecltypeSpecifier(DS, DeclLoc, EndLoc); 179 return false; 180 } 181 182 SourceLocation CCLoc = ConsumeToken(); 183 if (Actions.ActOnCXXNestedNameSpecifierDecltype(SS, DS, CCLoc)) 184 SS.SetInvalid(SourceRange(DeclLoc, CCLoc)); 185 186 HasScopeSpecifier = true; 187 } 188 189 while (true) { 190 if (HasScopeSpecifier) { 191 // C++ [basic.lookup.classref]p5: 192 // If the qualified-id has the form 193 // 194 // ::class-name-or-namespace-name::... 195 // 196 // the class-name-or-namespace-name is looked up in global scope as a 197 // class-name or namespace-name. 198 // 199 // To implement this, we clear out the object type as soon as we've 200 // seen a leading '::' or part of a nested-name-specifier. 201 ObjectType = ParsedType(); 202 203 if (Tok.is(tok::code_completion)) { 204 // Code completion for a nested-name-specifier, where the code 205 // code completion token follows the '::'. 206 Actions.CodeCompleteQualifiedId(getCurScope(), SS, EnteringContext); 207 // Include code completion token into the range of the scope otherwise 208 // when we try to annotate the scope tokens the dangling code completion 209 // token will cause assertion in 210 // Preprocessor::AnnotatePreviousCachedTokens. 211 SS.setEndLoc(Tok.getLocation()); 212 cutOffParsing(); 213 return true; 214 } 215 } 216 217 // nested-name-specifier: 218 // nested-name-specifier 'template'[opt] simple-template-id '::' 219 220 // Parse the optional 'template' keyword, then make sure we have 221 // 'identifier <' after it. 222 if (Tok.is(tok::kw_template)) { 223 // If we don't have a scope specifier or an object type, this isn't a 224 // nested-name-specifier, since they aren't allowed to start with 225 // 'template'. 226 if (!HasScopeSpecifier && !ObjectType) 227 break; 228 229 TentativeParsingAction TPA(*this); 230 SourceLocation TemplateKWLoc = ConsumeToken(); 231 232 UnqualifiedId TemplateName; 233 if (Tok.is(tok::identifier)) { 234 // Consume the identifier. 235 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 236 ConsumeToken(); 237 } else if (Tok.is(tok::kw_operator)) { 238 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, 239 TemplateName)) { 240 TPA.Commit(); 241 break; 242 } 243 244 if (TemplateName.getKind() != UnqualifiedId::IK_OperatorFunctionId && 245 TemplateName.getKind() != UnqualifiedId::IK_LiteralOperatorId) { 246 Diag(TemplateName.getSourceRange().getBegin(), 247 diag::err_id_after_template_in_nested_name_spec) 248 << TemplateName.getSourceRange(); 249 TPA.Commit(); 250 break; 251 } 252 } else { 253 TPA.Revert(); 254 break; 255 } 256 257 // If the next token is not '<', we have a qualified-id that refers 258 // to a template name, such as T::template apply, but is not a 259 // template-id. 260 if (Tok.isNot(tok::less)) { 261 TPA.Revert(); 262 break; 263 } 264 265 // Commit to parsing the template-id. 266 TPA.Commit(); 267 TemplateTy Template; 268 if (TemplateNameKind TNK 269 = Actions.ActOnDependentTemplateName(getCurScope(), 270 SS, TemplateKWLoc, TemplateName, 271 ObjectType, EnteringContext, 272 Template)) { 273 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateKWLoc, 274 TemplateName, false)) 275 return true; 276 } else 277 return true; 278 279 continue; 280 } 281 282 if (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) { 283 // We have 284 // 285 // simple-template-id '::' 286 // 287 // So we need to check whether the simple-template-id is of the 288 // right kind (it should name a type or be dependent), and then 289 // convert it into a type within the nested-name-specifier. 290 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 291 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde)) { 292 *MayBePseudoDestructor = true; 293 return false; 294 } 295 296 // Consume the template-id token. 297 ConsumeToken(); 298 299 assert(Tok.is(tok::coloncolon) && "NextToken() not working properly!"); 300 SourceLocation CCLoc = ConsumeToken(); 301 302 HasScopeSpecifier = true; 303 304 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 305 TemplateId->getTemplateArgs(), 306 TemplateId->NumArgs); 307 308 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(), 309 SS, 310 TemplateId->TemplateKWLoc, 311 TemplateId->Template, 312 TemplateId->TemplateNameLoc, 313 TemplateId->LAngleLoc, 314 TemplateArgsPtr, 315 TemplateId->RAngleLoc, 316 CCLoc, 317 EnteringContext)) { 318 SourceLocation StartLoc 319 = SS.getBeginLoc().isValid()? SS.getBeginLoc() 320 : TemplateId->TemplateNameLoc; 321 SS.SetInvalid(SourceRange(StartLoc, CCLoc)); 322 } 323 324 continue; 325 } 326 327 328 // The rest of the nested-name-specifier possibilities start with 329 // tok::identifier. 330 if (Tok.isNot(tok::identifier)) 331 break; 332 333 IdentifierInfo &II = *Tok.getIdentifierInfo(); 334 335 // nested-name-specifier: 336 // type-name '::' 337 // namespace-name '::' 338 // nested-name-specifier identifier '::' 339 Token Next = NextToken(); 340 341 // If we get foo:bar, this is almost certainly a typo for foo::bar. Recover 342 // and emit a fixit hint for it. 343 if (Next.is(tok::colon) && !ColonIsSacred) { 344 if (Actions.IsInvalidUnlessNestedName(getCurScope(), SS, II, 345 Tok.getLocation(), 346 Next.getLocation(), ObjectType, 347 EnteringContext) && 348 // If the token after the colon isn't an identifier, it's still an 349 // error, but they probably meant something else strange so don't 350 // recover like this. 351 PP.LookAhead(1).is(tok::identifier)) { 352 Diag(Next, diag::err_unexected_colon_in_nested_name_spec) 353 << FixItHint::CreateReplacement(Next.getLocation(), "::"); 354 355 // Recover as if the user wrote '::'. 356 Next.setKind(tok::coloncolon); 357 } 358 } 359 360 if (Next.is(tok::coloncolon)) { 361 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde) && 362 !Actions.isNonTypeNestedNameSpecifier(getCurScope(), SS, Tok.getLocation(), 363 II, ObjectType)) { 364 *MayBePseudoDestructor = true; 365 return false; 366 } 367 368 // We have an identifier followed by a '::'. Lookup this name 369 // as the name in a nested-name-specifier. 370 SourceLocation IdLoc = ConsumeToken(); 371 assert((Tok.is(tok::coloncolon) || Tok.is(tok::colon)) && 372 "NextToken() not working properly!"); 373 SourceLocation CCLoc = ConsumeToken(); 374 375 HasScopeSpecifier = true; 376 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(), II, IdLoc, CCLoc, 377 ObjectType, EnteringContext, SS)) 378 SS.SetInvalid(SourceRange(IdLoc, CCLoc)); 379 380 continue; 381 } 382 383 CheckForTemplateAndDigraph(Next, ObjectType, EnteringContext, II, SS); 384 385 // nested-name-specifier: 386 // type-name '<' 387 if (Next.is(tok::less)) { 388 TemplateTy Template; 389 UnqualifiedId TemplateName; 390 TemplateName.setIdentifier(&II, Tok.getLocation()); 391 bool MemberOfUnknownSpecialization; 392 if (TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS, 393 /*hasTemplateKeyword=*/false, 394 TemplateName, 395 ObjectType, 396 EnteringContext, 397 Template, 398 MemberOfUnknownSpecialization)) { 399 // We have found a template name, so annotate this token 400 // with a template-id annotation. We do not permit the 401 // template-id to be translated into a type annotation, 402 // because some clients (e.g., the parsing of class template 403 // specializations) still want to see the original template-id 404 // token. 405 ConsumeToken(); 406 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(), 407 TemplateName, false)) 408 return true; 409 continue; 410 } 411 412 if (MemberOfUnknownSpecialization && (ObjectType || SS.isSet()) && 413 (IsTypename || IsTemplateArgumentList(1))) { 414 // We have something like t::getAs<T>, where getAs is a 415 // member of an unknown specialization. However, this will only 416 // parse correctly as a template, so suggest the keyword 'template' 417 // before 'getAs' and treat this as a dependent template name. 418 unsigned DiagID = diag::err_missing_dependent_template_keyword; 419 if (getLangOpts().MicrosoftExt) 420 DiagID = diag::warn_missing_dependent_template_keyword; 421 422 Diag(Tok.getLocation(), DiagID) 423 << II.getName() 424 << FixItHint::CreateInsertion(Tok.getLocation(), "template "); 425 426 if (TemplateNameKind TNK 427 = Actions.ActOnDependentTemplateName(getCurScope(), 428 SS, SourceLocation(), 429 TemplateName, ObjectType, 430 EnteringContext, Template)) { 431 // Consume the identifier. 432 ConsumeToken(); 433 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(), 434 TemplateName, false)) 435 return true; 436 } 437 else 438 return true; 439 440 continue; 441 } 442 } 443 444 // We don't have any tokens that form the beginning of a 445 // nested-name-specifier, so we're done. 446 break; 447 } 448 449 // Even if we didn't see any pieces of a nested-name-specifier, we 450 // still check whether there is a tilde in this position, which 451 // indicates a potential pseudo-destructor. 452 if (CheckForDestructor && Tok.is(tok::tilde)) 453 *MayBePseudoDestructor = true; 454 455 return false; 456} 457 458/// ParseCXXIdExpression - Handle id-expression. 459/// 460/// id-expression: 461/// unqualified-id 462/// qualified-id 463/// 464/// qualified-id: 465/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 466/// '::' identifier 467/// '::' operator-function-id 468/// '::' template-id 469/// 470/// NOTE: The standard specifies that, for qualified-id, the parser does not 471/// expect: 472/// 473/// '::' conversion-function-id 474/// '::' '~' class-name 475/// 476/// This may cause a slight inconsistency on diagnostics: 477/// 478/// class C {}; 479/// namespace A {} 480/// void f() { 481/// :: A :: ~ C(); // Some Sema error about using destructor with a 482/// // namespace. 483/// :: ~ C(); // Some Parser error like 'unexpected ~'. 484/// } 485/// 486/// We simplify the parser a bit and make it work like: 487/// 488/// qualified-id: 489/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 490/// '::' unqualified-id 491/// 492/// That way Sema can handle and report similar errors for namespaces and the 493/// global scope. 494/// 495/// The isAddressOfOperand parameter indicates that this id-expression is a 496/// direct operand of the address-of operator. This is, besides member contexts, 497/// the only place where a qualified-id naming a non-static class member may 498/// appear. 499/// 500ExprResult Parser::ParseCXXIdExpression(bool isAddressOfOperand) { 501 // qualified-id: 502 // '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 503 // '::' unqualified-id 504 // 505 CXXScopeSpec SS; 506 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), /*EnteringContext=*/false); 507 508 SourceLocation TemplateKWLoc; 509 UnqualifiedId Name; 510 if (ParseUnqualifiedId(SS, 511 /*EnteringContext=*/false, 512 /*AllowDestructorName=*/false, 513 /*AllowConstructorName=*/false, 514 /*ObjectType=*/ ParsedType(), 515 TemplateKWLoc, 516 Name)) 517 return ExprError(); 518 519 // This is only the direct operand of an & operator if it is not 520 // followed by a postfix-expression suffix. 521 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 522 isAddressOfOperand = false; 523 524 return Actions.ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Name, 525 Tok.is(tok::l_paren), isAddressOfOperand); 526} 527 528/// ParseLambdaExpression - Parse a C++0x lambda expression. 529/// 530/// lambda-expression: 531/// lambda-introducer lambda-declarator[opt] compound-statement 532/// 533/// lambda-introducer: 534/// '[' lambda-capture[opt] ']' 535/// 536/// lambda-capture: 537/// capture-default 538/// capture-list 539/// capture-default ',' capture-list 540/// 541/// capture-default: 542/// '&' 543/// '=' 544/// 545/// capture-list: 546/// capture 547/// capture-list ',' capture 548/// 549/// capture: 550/// identifier 551/// '&' identifier 552/// 'this' 553/// 554/// lambda-declarator: 555/// '(' parameter-declaration-clause ')' attribute-specifier[opt] 556/// 'mutable'[opt] exception-specification[opt] 557/// trailing-return-type[opt] 558/// 559ExprResult Parser::ParseLambdaExpression() { 560 // Parse lambda-introducer. 561 LambdaIntroducer Intro; 562 563 llvm::Optional<unsigned> DiagID(ParseLambdaIntroducer(Intro)); 564 if (DiagID) { 565 Diag(Tok, DiagID.getValue()); 566 SkipUntil(tok::r_square); 567 SkipUntil(tok::l_brace); 568 SkipUntil(tok::r_brace); 569 return ExprError(); 570 } 571 572 return ParseLambdaExpressionAfterIntroducer(Intro); 573} 574 575/// TryParseLambdaExpression - Use lookahead and potentially tentative 576/// parsing to determine if we are looking at a C++0x lambda expression, and parse 577/// it if we are. 578/// 579/// If we are not looking at a lambda expression, returns ExprError(). 580ExprResult Parser::TryParseLambdaExpression() { 581 assert(getLangOpts().CPlusPlus0x 582 && Tok.is(tok::l_square) 583 && "Not at the start of a possible lambda expression."); 584 585 const Token Next = NextToken(), After = GetLookAheadToken(2); 586 587 // If lookahead indicates this is a lambda... 588 if (Next.is(tok::r_square) || // [] 589 Next.is(tok::equal) || // [= 590 (Next.is(tok::amp) && // [&] or [&, 591 (After.is(tok::r_square) || 592 After.is(tok::comma))) || 593 (Next.is(tok::identifier) && // [identifier] 594 After.is(tok::r_square))) { 595 return ParseLambdaExpression(); 596 } 597 598 // If lookahead indicates an ObjC message send... 599 // [identifier identifier 600 if (Next.is(tok::identifier) && After.is(tok::identifier)) { 601 return ExprEmpty(); 602 } 603 604 // Here, we're stuck: lambda introducers and Objective-C message sends are 605 // unambiguous, but it requires arbitrary lookhead. [a,b,c,d,e,f,g] is a 606 // lambda, and [a,b,c,d,e,f,g h] is a Objective-C message send. Instead of 607 // writing two routines to parse a lambda introducer, just try to parse 608 // a lambda introducer first, and fall back if that fails. 609 // (TryParseLambdaIntroducer never produces any diagnostic output.) 610 LambdaIntroducer Intro; 611 if (TryParseLambdaIntroducer(Intro)) 612 return ExprEmpty(); 613 return ParseLambdaExpressionAfterIntroducer(Intro); 614} 615 616/// ParseLambdaExpression - Parse a lambda introducer. 617/// 618/// Returns a DiagnosticID if it hit something unexpected. 619llvm::Optional<unsigned> Parser::ParseLambdaIntroducer(LambdaIntroducer &Intro){ 620 typedef llvm::Optional<unsigned> DiagResult; 621 622 assert(Tok.is(tok::l_square) && "Lambda expressions begin with '['."); 623 BalancedDelimiterTracker T(*this, tok::l_square); 624 T.consumeOpen(); 625 626 Intro.Range.setBegin(T.getOpenLocation()); 627 628 bool first = true; 629 630 // Parse capture-default. 631 if (Tok.is(tok::amp) && 632 (NextToken().is(tok::comma) || NextToken().is(tok::r_square))) { 633 Intro.Default = LCD_ByRef; 634 Intro.DefaultLoc = ConsumeToken(); 635 first = false; 636 } else if (Tok.is(tok::equal)) { 637 Intro.Default = LCD_ByCopy; 638 Intro.DefaultLoc = ConsumeToken(); 639 first = false; 640 } 641 642 while (Tok.isNot(tok::r_square)) { 643 if (!first) { 644 if (Tok.isNot(tok::comma)) { 645 if (Tok.is(tok::code_completion)) { 646 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro, 647 /*AfterAmpersand=*/false); 648 ConsumeCodeCompletionToken(); 649 break; 650 } 651 652 return DiagResult(diag::err_expected_comma_or_rsquare); 653 } 654 ConsumeToken(); 655 } 656 657 if (Tok.is(tok::code_completion)) { 658 // If we're in Objective-C++ and we have a bare '[', then this is more 659 // likely to be a message receiver. 660 if (getLangOpts().ObjC1 && first) 661 Actions.CodeCompleteObjCMessageReceiver(getCurScope()); 662 else 663 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro, 664 /*AfterAmpersand=*/false); 665 ConsumeCodeCompletionToken(); 666 break; 667 } 668 669 first = false; 670 671 // Parse capture. 672 LambdaCaptureKind Kind = LCK_ByCopy; 673 SourceLocation Loc; 674 IdentifierInfo* Id = 0; 675 SourceLocation EllipsisLoc; 676 677 if (Tok.is(tok::kw_this)) { 678 Kind = LCK_This; 679 Loc = ConsumeToken(); 680 } else { 681 if (Tok.is(tok::amp)) { 682 Kind = LCK_ByRef; 683 ConsumeToken(); 684 685 if (Tok.is(tok::code_completion)) { 686 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro, 687 /*AfterAmpersand=*/true); 688 ConsumeCodeCompletionToken(); 689 break; 690 } 691 } 692 693 if (Tok.is(tok::identifier)) { 694 Id = Tok.getIdentifierInfo(); 695 Loc = ConsumeToken(); 696 697 if (Tok.is(tok::ellipsis)) 698 EllipsisLoc = ConsumeToken(); 699 } else if (Tok.is(tok::kw_this)) { 700 // FIXME: If we want to suggest a fixit here, will need to return more 701 // than just DiagnosticID. Perhaps full DiagnosticBuilder that can be 702 // Clear()ed to prevent emission in case of tentative parsing? 703 return DiagResult(diag::err_this_captured_by_reference); 704 } else { 705 return DiagResult(diag::err_expected_capture); 706 } 707 } 708 709 Intro.addCapture(Kind, Loc, Id, EllipsisLoc); 710 } 711 712 T.consumeClose(); 713 Intro.Range.setEnd(T.getCloseLocation()); 714 715 return DiagResult(); 716} 717 718/// TryParseLambdaIntroducer - Tentatively parse a lambda introducer. 719/// 720/// Returns true if it hit something unexpected. 721bool Parser::TryParseLambdaIntroducer(LambdaIntroducer &Intro) { 722 TentativeParsingAction PA(*this); 723 724 llvm::Optional<unsigned> DiagID(ParseLambdaIntroducer(Intro)); 725 726 if (DiagID) { 727 PA.Revert(); 728 return true; 729 } 730 731 PA.Commit(); 732 return false; 733} 734 735/// ParseLambdaExpressionAfterIntroducer - Parse the rest of a lambda 736/// expression. 737ExprResult Parser::ParseLambdaExpressionAfterIntroducer( 738 LambdaIntroducer &Intro) { 739 SourceLocation LambdaBeginLoc = Intro.Range.getBegin(); 740 Diag(LambdaBeginLoc, diag::warn_cxx98_compat_lambda); 741 742 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), LambdaBeginLoc, 743 "lambda expression parsing"); 744 745 // Parse lambda-declarator[opt]. 746 DeclSpec DS(AttrFactory); 747 Declarator D(DS, Declarator::LambdaExprContext); 748 749 if (Tok.is(tok::l_paren)) { 750 ParseScope PrototypeScope(this, 751 Scope::FunctionPrototypeScope | 752 Scope::DeclScope); 753 754 SourceLocation DeclLoc, DeclEndLoc; 755 BalancedDelimiterTracker T(*this, tok::l_paren); 756 T.consumeOpen(); 757 DeclLoc = T.getOpenLocation(); 758 759 // Parse parameter-declaration-clause. 760 ParsedAttributes Attr(AttrFactory); 761 llvm::SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo; 762 SourceLocation EllipsisLoc; 763 764 if (Tok.isNot(tok::r_paren)) 765 ParseParameterDeclarationClause(D, Attr, ParamInfo, EllipsisLoc); 766 767 T.consumeClose(); 768 DeclEndLoc = T.getCloseLocation(); 769 770 // Parse 'mutable'[opt]. 771 SourceLocation MutableLoc; 772 if (Tok.is(tok::kw_mutable)) { 773 MutableLoc = ConsumeToken(); 774 DeclEndLoc = MutableLoc; 775 } 776 777 // Parse exception-specification[opt]. 778 ExceptionSpecificationType ESpecType = EST_None; 779 SourceRange ESpecRange; 780 llvm::SmallVector<ParsedType, 2> DynamicExceptions; 781 llvm::SmallVector<SourceRange, 2> DynamicExceptionRanges; 782 ExprResult NoexceptExpr; 783 ESpecType = tryParseExceptionSpecification(ESpecRange, 784 DynamicExceptions, 785 DynamicExceptionRanges, 786 NoexceptExpr); 787 788 if (ESpecType != EST_None) 789 DeclEndLoc = ESpecRange.getEnd(); 790 791 // Parse attribute-specifier[opt]. 792 MaybeParseCXX0XAttributes(Attr, &DeclEndLoc); 793 794 // Parse trailing-return-type[opt]. 795 TypeResult TrailingReturnType; 796 if (Tok.is(tok::arrow)) { 797 SourceRange Range; 798 TrailingReturnType = ParseTrailingReturnType(Range); 799 if (Range.getEnd().isValid()) 800 DeclEndLoc = Range.getEnd(); 801 } 802 803 PrototypeScope.Exit(); 804 805 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true, 806 /*isVariadic=*/EllipsisLoc.isValid(), 807 EllipsisLoc, 808 ParamInfo.data(), ParamInfo.size(), 809 DS.getTypeQualifiers(), 810 /*RefQualifierIsLValueRef=*/true, 811 /*RefQualifierLoc=*/SourceLocation(), 812 /*ConstQualifierLoc=*/SourceLocation(), 813 /*VolatileQualifierLoc=*/SourceLocation(), 814 MutableLoc, 815 ESpecType, ESpecRange.getBegin(), 816 DynamicExceptions.data(), 817 DynamicExceptionRanges.data(), 818 DynamicExceptions.size(), 819 NoexceptExpr.isUsable() ? 820 NoexceptExpr.get() : 0, 821 DeclLoc, DeclEndLoc, D, 822 TrailingReturnType), 823 Attr, DeclEndLoc); 824 } else if (Tok.is(tok::kw_mutable) || Tok.is(tok::arrow)) { 825 // It's common to forget that one needs '()' before 'mutable' or the 826 // result type. Deal with this. 827 Diag(Tok, diag::err_lambda_missing_parens) 828 << Tok.is(tok::arrow) 829 << FixItHint::CreateInsertion(Tok.getLocation(), "() "); 830 SourceLocation DeclLoc = Tok.getLocation(); 831 SourceLocation DeclEndLoc = DeclLoc; 832 833 // Parse 'mutable', if it's there. 834 SourceLocation MutableLoc; 835 if (Tok.is(tok::kw_mutable)) { 836 MutableLoc = ConsumeToken(); 837 DeclEndLoc = MutableLoc; 838 } 839 840 // Parse the return type, if there is one. 841 TypeResult TrailingReturnType; 842 if (Tok.is(tok::arrow)) { 843 SourceRange Range; 844 TrailingReturnType = ParseTrailingReturnType(Range); 845 if (Range.getEnd().isValid()) 846 DeclEndLoc = Range.getEnd(); 847 } 848 849 ParsedAttributes Attr(AttrFactory); 850 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true, 851 /*isVariadic=*/false, 852 /*EllipsisLoc=*/SourceLocation(), 853 /*Params=*/0, /*NumParams=*/0, 854 /*TypeQuals=*/0, 855 /*RefQualifierIsLValueRef=*/true, 856 /*RefQualifierLoc=*/SourceLocation(), 857 /*ConstQualifierLoc=*/SourceLocation(), 858 /*VolatileQualifierLoc=*/SourceLocation(), 859 MutableLoc, 860 EST_None, 861 /*ESpecLoc=*/SourceLocation(), 862 /*Exceptions=*/0, 863 /*ExceptionRanges=*/0, 864 /*NumExceptions=*/0, 865 /*NoexceptExpr=*/0, 866 DeclLoc, DeclEndLoc, D, 867 TrailingReturnType), 868 Attr, DeclEndLoc); 869 } 870 871 872 // FIXME: Rename BlockScope -> ClosureScope if we decide to continue using 873 // it. 874 unsigned ScopeFlags = Scope::BlockScope | Scope::FnScope | Scope::DeclScope; 875 ParseScope BodyScope(this, ScopeFlags); 876 877 Actions.ActOnStartOfLambdaDefinition(Intro, D, getCurScope()); 878 879 // Parse compound-statement. 880 if (!Tok.is(tok::l_brace)) { 881 Diag(Tok, diag::err_expected_lambda_body); 882 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope()); 883 return ExprError(); 884 } 885 886 StmtResult Stmt(ParseCompoundStatementBody()); 887 BodyScope.Exit(); 888 889 if (!Stmt.isInvalid()) 890 return Actions.ActOnLambdaExpr(LambdaBeginLoc, Stmt.take(), getCurScope()); 891 892 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope()); 893 return ExprError(); 894} 895 896/// ParseCXXCasts - This handles the various ways to cast expressions to another 897/// type. 898/// 899/// postfix-expression: [C++ 5.2p1] 900/// 'dynamic_cast' '<' type-name '>' '(' expression ')' 901/// 'static_cast' '<' type-name '>' '(' expression ')' 902/// 'reinterpret_cast' '<' type-name '>' '(' expression ')' 903/// 'const_cast' '<' type-name '>' '(' expression ')' 904/// 905ExprResult Parser::ParseCXXCasts() { 906 tok::TokenKind Kind = Tok.getKind(); 907 const char *CastName = 0; // For error messages 908 909 switch (Kind) { 910 default: llvm_unreachable("Unknown C++ cast!"); 911 case tok::kw_const_cast: CastName = "const_cast"; break; 912 case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break; 913 case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break; 914 case tok::kw_static_cast: CastName = "static_cast"; break; 915 } 916 917 SourceLocation OpLoc = ConsumeToken(); 918 SourceLocation LAngleBracketLoc = Tok.getLocation(); 919 920 // Check for "<::" which is parsed as "[:". If found, fix token stream, 921 // diagnose error, suggest fix, and recover parsing. 922 Token Next = NextToken(); 923 if (Tok.is(tok::l_square) && Tok.getLength() == 2 && Next.is(tok::colon) && 924 AreTokensAdjacent(PP, Tok, Next)) 925 FixDigraph(*this, PP, Tok, Next, Kind, /*AtDigraph*/true); 926 927 if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName)) 928 return ExprError(); 929 930 // Parse the common declaration-specifiers piece. 931 DeclSpec DS(AttrFactory); 932 ParseSpecifierQualifierList(DS); 933 934 // Parse the abstract-declarator, if present. 935 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 936 ParseDeclarator(DeclaratorInfo); 937 938 SourceLocation RAngleBracketLoc = Tok.getLocation(); 939 940 if (ExpectAndConsume(tok::greater, diag::err_expected_greater)) 941 return ExprError(Diag(LAngleBracketLoc, diag::note_matching) << "<"); 942 943 SourceLocation LParenLoc, RParenLoc; 944 BalancedDelimiterTracker T(*this, tok::l_paren); 945 946 if (T.expectAndConsume(diag::err_expected_lparen_after, CastName)) 947 return ExprError(); 948 949 ExprResult Result = ParseExpression(); 950 951 // Match the ')'. 952 T.consumeClose(); 953 954 if (!Result.isInvalid() && !DeclaratorInfo.isInvalidType()) 955 Result = Actions.ActOnCXXNamedCast(OpLoc, Kind, 956 LAngleBracketLoc, DeclaratorInfo, 957 RAngleBracketLoc, 958 T.getOpenLocation(), Result.take(), 959 T.getCloseLocation()); 960 961 return move(Result); 962} 963 964/// ParseCXXTypeid - This handles the C++ typeid expression. 965/// 966/// postfix-expression: [C++ 5.2p1] 967/// 'typeid' '(' expression ')' 968/// 'typeid' '(' type-id ')' 969/// 970ExprResult Parser::ParseCXXTypeid() { 971 assert(Tok.is(tok::kw_typeid) && "Not 'typeid'!"); 972 973 SourceLocation OpLoc = ConsumeToken(); 974 SourceLocation LParenLoc, RParenLoc; 975 BalancedDelimiterTracker T(*this, tok::l_paren); 976 977 // typeid expressions are always parenthesized. 978 if (T.expectAndConsume(diag::err_expected_lparen_after, "typeid")) 979 return ExprError(); 980 LParenLoc = T.getOpenLocation(); 981 982 ExprResult Result; 983 984 if (isTypeIdInParens()) { 985 TypeResult Ty = ParseTypeName(); 986 987 // Match the ')'. 988 T.consumeClose(); 989 RParenLoc = T.getCloseLocation(); 990 if (Ty.isInvalid() || RParenLoc.isInvalid()) 991 return ExprError(); 992 993 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/true, 994 Ty.get().getAsOpaquePtr(), RParenLoc); 995 } else { 996 // C++0x [expr.typeid]p3: 997 // When typeid is applied to an expression other than an lvalue of a 998 // polymorphic class type [...] The expression is an unevaluated 999 // operand (Clause 5). 1000 // 1001 // Note that we can't tell whether the expression is an lvalue of a 1002 // polymorphic class type until after we've parsed the expression; we 1003 // speculatively assume the subexpression is unevaluated, and fix it up 1004 // later. 1005 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1006 Result = ParseExpression(); 1007 1008 // Match the ')'. 1009 if (Result.isInvalid()) 1010 SkipUntil(tok::r_paren); 1011 else { 1012 T.consumeClose(); 1013 RParenLoc = T.getCloseLocation(); 1014 if (RParenLoc.isInvalid()) 1015 return ExprError(); 1016 1017 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/false, 1018 Result.release(), RParenLoc); 1019 } 1020 } 1021 1022 return move(Result); 1023} 1024 1025/// ParseCXXUuidof - This handles the Microsoft C++ __uuidof expression. 1026/// 1027/// '__uuidof' '(' expression ')' 1028/// '__uuidof' '(' type-id ')' 1029/// 1030ExprResult Parser::ParseCXXUuidof() { 1031 assert(Tok.is(tok::kw___uuidof) && "Not '__uuidof'!"); 1032 1033 SourceLocation OpLoc = ConsumeToken(); 1034 BalancedDelimiterTracker T(*this, tok::l_paren); 1035 1036 // __uuidof expressions are always parenthesized. 1037 if (T.expectAndConsume(diag::err_expected_lparen_after, "__uuidof")) 1038 return ExprError(); 1039 1040 ExprResult Result; 1041 1042 if (isTypeIdInParens()) { 1043 TypeResult Ty = ParseTypeName(); 1044 1045 // Match the ')'. 1046 T.consumeClose(); 1047 1048 if (Ty.isInvalid()) 1049 return ExprError(); 1050 1051 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(), /*isType=*/true, 1052 Ty.get().getAsOpaquePtr(), 1053 T.getCloseLocation()); 1054 } else { 1055 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1056 Result = ParseExpression(); 1057 1058 // Match the ')'. 1059 if (Result.isInvalid()) 1060 SkipUntil(tok::r_paren); 1061 else { 1062 T.consumeClose(); 1063 1064 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(), 1065 /*isType=*/false, 1066 Result.release(), T.getCloseLocation()); 1067 } 1068 } 1069 1070 return move(Result); 1071} 1072 1073/// \brief Parse a C++ pseudo-destructor expression after the base, 1074/// . or -> operator, and nested-name-specifier have already been 1075/// parsed. 1076/// 1077/// postfix-expression: [C++ 5.2] 1078/// postfix-expression . pseudo-destructor-name 1079/// postfix-expression -> pseudo-destructor-name 1080/// 1081/// pseudo-destructor-name: 1082/// ::[opt] nested-name-specifier[opt] type-name :: ~type-name 1083/// ::[opt] nested-name-specifier template simple-template-id :: 1084/// ~type-name 1085/// ::[opt] nested-name-specifier[opt] ~type-name 1086/// 1087ExprResult 1088Parser::ParseCXXPseudoDestructor(ExprArg Base, SourceLocation OpLoc, 1089 tok::TokenKind OpKind, 1090 CXXScopeSpec &SS, 1091 ParsedType ObjectType) { 1092 // We're parsing either a pseudo-destructor-name or a dependent 1093 // member access that has the same form as a 1094 // pseudo-destructor-name. We parse both in the same way and let 1095 // the action model sort them out. 1096 // 1097 // Note that the ::[opt] nested-name-specifier[opt] has already 1098 // been parsed, and if there was a simple-template-id, it has 1099 // been coalesced into a template-id annotation token. 1100 UnqualifiedId FirstTypeName; 1101 SourceLocation CCLoc; 1102 if (Tok.is(tok::identifier)) { 1103 FirstTypeName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 1104 ConsumeToken(); 1105 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail"); 1106 CCLoc = ConsumeToken(); 1107 } else if (Tok.is(tok::annot_template_id)) { 1108 // FIXME: retrieve TemplateKWLoc from template-id annotation and 1109 // store it in the pseudo-dtor node (to be used when instantiating it). 1110 FirstTypeName.setTemplateId( 1111 (TemplateIdAnnotation *)Tok.getAnnotationValue()); 1112 ConsumeToken(); 1113 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail"); 1114 CCLoc = ConsumeToken(); 1115 } else { 1116 FirstTypeName.setIdentifier(0, SourceLocation()); 1117 } 1118 1119 // Parse the tilde. 1120 assert(Tok.is(tok::tilde) && "ParseOptionalCXXScopeSpecifier fail"); 1121 SourceLocation TildeLoc = ConsumeToken(); 1122 1123 if (Tok.is(tok::kw_decltype) && !FirstTypeName.isValid() && SS.isEmpty()) { 1124 DeclSpec DS(AttrFactory); 1125 ParseDecltypeSpecifier(DS); 1126 if (DS.getTypeSpecType() == TST_error) 1127 return ExprError(); 1128 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, OpLoc, 1129 OpKind, TildeLoc, DS, 1130 Tok.is(tok::l_paren)); 1131 } 1132 1133 if (!Tok.is(tok::identifier)) { 1134 Diag(Tok, diag::err_destructor_tilde_identifier); 1135 return ExprError(); 1136 } 1137 1138 // Parse the second type. 1139 UnqualifiedId SecondTypeName; 1140 IdentifierInfo *Name = Tok.getIdentifierInfo(); 1141 SourceLocation NameLoc = ConsumeToken(); 1142 SecondTypeName.setIdentifier(Name, NameLoc); 1143 1144 // If there is a '<', the second type name is a template-id. Parse 1145 // it as such. 1146 if (Tok.is(tok::less) && 1147 ParseUnqualifiedIdTemplateId(SS, SourceLocation(), 1148 Name, NameLoc, 1149 false, ObjectType, SecondTypeName, 1150 /*AssumeTemplateName=*/true)) 1151 return ExprError(); 1152 1153 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, 1154 OpLoc, OpKind, 1155 SS, FirstTypeName, CCLoc, 1156 TildeLoc, SecondTypeName, 1157 Tok.is(tok::l_paren)); 1158} 1159 1160/// ParseCXXBoolLiteral - This handles the C++ Boolean literals. 1161/// 1162/// boolean-literal: [C++ 2.13.5] 1163/// 'true' 1164/// 'false' 1165ExprResult Parser::ParseCXXBoolLiteral() { 1166 tok::TokenKind Kind = Tok.getKind(); 1167 return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind); 1168} 1169 1170/// ParseThrowExpression - This handles the C++ throw expression. 1171/// 1172/// throw-expression: [C++ 15] 1173/// 'throw' assignment-expression[opt] 1174ExprResult Parser::ParseThrowExpression() { 1175 assert(Tok.is(tok::kw_throw) && "Not throw!"); 1176 SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token. 1177 1178 // If the current token isn't the start of an assignment-expression, 1179 // then the expression is not present. This handles things like: 1180 // "C ? throw : (void)42", which is crazy but legal. 1181 switch (Tok.getKind()) { // FIXME: move this predicate somewhere common. 1182 case tok::semi: 1183 case tok::r_paren: 1184 case tok::r_square: 1185 case tok::r_brace: 1186 case tok::colon: 1187 case tok::comma: 1188 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, 0); 1189 1190 default: 1191 ExprResult Expr(ParseAssignmentExpression()); 1192 if (Expr.isInvalid()) return move(Expr); 1193 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, Expr.take()); 1194 } 1195} 1196 1197/// ParseCXXThis - This handles the C++ 'this' pointer. 1198/// 1199/// C++ 9.3.2: In the body of a non-static member function, the keyword this is 1200/// a non-lvalue expression whose value is the address of the object for which 1201/// the function is called. 1202ExprResult Parser::ParseCXXThis() { 1203 assert(Tok.is(tok::kw_this) && "Not 'this'!"); 1204 SourceLocation ThisLoc = ConsumeToken(); 1205 return Actions.ActOnCXXThis(ThisLoc); 1206} 1207 1208/// ParseCXXTypeConstructExpression - Parse construction of a specified type. 1209/// Can be interpreted either as function-style casting ("int(x)") 1210/// or class type construction ("ClassType(x,y,z)") 1211/// or creation of a value-initialized type ("int()"). 1212/// See [C++ 5.2.3]. 1213/// 1214/// postfix-expression: [C++ 5.2p1] 1215/// simple-type-specifier '(' expression-list[opt] ')' 1216/// [C++0x] simple-type-specifier braced-init-list 1217/// typename-specifier '(' expression-list[opt] ')' 1218/// [C++0x] typename-specifier braced-init-list 1219/// 1220ExprResult 1221Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) { 1222 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1223 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo).get(); 1224 1225 assert((Tok.is(tok::l_paren) || 1226 (getLangOpts().CPlusPlus0x && Tok.is(tok::l_brace))) 1227 && "Expected '(' or '{'!"); 1228 1229 if (Tok.is(tok::l_brace)) { 1230 ExprResult Init = ParseBraceInitializer(); 1231 if (Init.isInvalid()) 1232 return Init; 1233 Expr *InitList = Init.take(); 1234 return Actions.ActOnCXXTypeConstructExpr(TypeRep, SourceLocation(), 1235 MultiExprArg(&InitList, 1), 1236 SourceLocation()); 1237 } else { 1238 BalancedDelimiterTracker T(*this, tok::l_paren); 1239 T.consumeOpen(); 1240 1241 ExprVector Exprs(Actions); 1242 CommaLocsTy CommaLocs; 1243 1244 if (Tok.isNot(tok::r_paren)) { 1245 if (ParseExpressionList(Exprs, CommaLocs)) { 1246 SkipUntil(tok::r_paren); 1247 return ExprError(); 1248 } 1249 } 1250 1251 // Match the ')'. 1252 T.consumeClose(); 1253 1254 // TypeRep could be null, if it references an invalid typedef. 1255 if (!TypeRep) 1256 return ExprError(); 1257 1258 assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&& 1259 "Unexpected number of commas!"); 1260 return Actions.ActOnCXXTypeConstructExpr(TypeRep, T.getOpenLocation(), 1261 move_arg(Exprs), 1262 T.getCloseLocation()); 1263 } 1264} 1265 1266/// ParseCXXCondition - if/switch/while condition expression. 1267/// 1268/// condition: 1269/// expression 1270/// type-specifier-seq declarator '=' assignment-expression 1271/// [C++11] type-specifier-seq declarator '=' initializer-clause 1272/// [C++11] type-specifier-seq declarator braced-init-list 1273/// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt] 1274/// '=' assignment-expression 1275/// 1276/// \param ExprResult if the condition was parsed as an expression, the 1277/// parsed expression. 1278/// 1279/// \param DeclResult if the condition was parsed as a declaration, the 1280/// parsed declaration. 1281/// 1282/// \param Loc The location of the start of the statement that requires this 1283/// condition, e.g., the "for" in a for loop. 1284/// 1285/// \param ConvertToBoolean Whether the condition expression should be 1286/// converted to a boolean value. 1287/// 1288/// \returns true if there was a parsing, false otherwise. 1289bool Parser::ParseCXXCondition(ExprResult &ExprOut, 1290 Decl *&DeclOut, 1291 SourceLocation Loc, 1292 bool ConvertToBoolean) { 1293 if (Tok.is(tok::code_completion)) { 1294 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Condition); 1295 cutOffParsing(); 1296 return true; 1297 } 1298 1299 if (!isCXXConditionDeclaration()) { 1300 // Parse the expression. 1301 ExprOut = ParseExpression(); // expression 1302 DeclOut = 0; 1303 if (ExprOut.isInvalid()) 1304 return true; 1305 1306 // If required, convert to a boolean value. 1307 if (ConvertToBoolean) 1308 ExprOut 1309 = Actions.ActOnBooleanCondition(getCurScope(), Loc, ExprOut.get()); 1310 return ExprOut.isInvalid(); 1311 } 1312 1313 // type-specifier-seq 1314 DeclSpec DS(AttrFactory); 1315 ParseSpecifierQualifierList(DS); 1316 1317 // declarator 1318 Declarator DeclaratorInfo(DS, Declarator::ConditionContext); 1319 ParseDeclarator(DeclaratorInfo); 1320 1321 // simple-asm-expr[opt] 1322 if (Tok.is(tok::kw_asm)) { 1323 SourceLocation Loc; 1324 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 1325 if (AsmLabel.isInvalid()) { 1326 SkipUntil(tok::semi); 1327 return true; 1328 } 1329 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 1330 DeclaratorInfo.SetRangeEnd(Loc); 1331 } 1332 1333 // If attributes are present, parse them. 1334 MaybeParseGNUAttributes(DeclaratorInfo); 1335 1336 // Type-check the declaration itself. 1337 DeclResult Dcl = Actions.ActOnCXXConditionDeclaration(getCurScope(), 1338 DeclaratorInfo); 1339 DeclOut = Dcl.get(); 1340 ExprOut = ExprError(); 1341 1342 // '=' assignment-expression 1343 // If a '==' or '+=' is found, suggest a fixit to '='. 1344 bool CopyInitialization = isTokenEqualOrEqualTypo(); 1345 if (CopyInitialization) 1346 ConsumeToken(); 1347 1348 ExprResult InitExpr = ExprError(); 1349 if (getLangOpts().CPlusPlus0x && Tok.is(tok::l_brace)) { 1350 Diag(Tok.getLocation(), 1351 diag::warn_cxx98_compat_generalized_initializer_lists); 1352 InitExpr = ParseBraceInitializer(); 1353 } else if (CopyInitialization) { 1354 InitExpr = ParseAssignmentExpression(); 1355 } else if (Tok.is(tok::l_paren)) { 1356 // This was probably an attempt to initialize the variable. 1357 SourceLocation LParen = ConsumeParen(), RParen = LParen; 1358 if (SkipUntil(tok::r_paren, true, /*DontConsume=*/true)) 1359 RParen = ConsumeParen(); 1360 Diag(DeclOut ? DeclOut->getLocation() : LParen, 1361 diag::err_expected_init_in_condition_lparen) 1362 << SourceRange(LParen, RParen); 1363 } else { 1364 Diag(DeclOut ? DeclOut->getLocation() : Tok.getLocation(), 1365 diag::err_expected_init_in_condition); 1366 } 1367 1368 if (!InitExpr.isInvalid()) 1369 Actions.AddInitializerToDecl(DeclOut, InitExpr.take(), !CopyInitialization, 1370 DS.getTypeSpecType() == DeclSpec::TST_auto); 1371 1372 // FIXME: Build a reference to this declaration? Convert it to bool? 1373 // (This is currently handled by Sema). 1374 1375 Actions.FinalizeDeclaration(DeclOut); 1376 1377 return false; 1378} 1379 1380/// \brief Determine whether the current token starts a C++ 1381/// simple-type-specifier. 1382bool Parser::isCXXSimpleTypeSpecifier() const { 1383 switch (Tok.getKind()) { 1384 case tok::annot_typename: 1385 case tok::kw_short: 1386 case tok::kw_long: 1387 case tok::kw___int64: 1388 case tok::kw___int128: 1389 case tok::kw_signed: 1390 case tok::kw_unsigned: 1391 case tok::kw_void: 1392 case tok::kw_char: 1393 case tok::kw_int: 1394 case tok::kw_half: 1395 case tok::kw_float: 1396 case tok::kw_double: 1397 case tok::kw_wchar_t: 1398 case tok::kw_char16_t: 1399 case tok::kw_char32_t: 1400 case tok::kw_bool: 1401 case tok::kw_decltype: 1402 case tok::kw_typeof: 1403 case tok::kw___underlying_type: 1404 return true; 1405 1406 default: 1407 break; 1408 } 1409 1410 return false; 1411} 1412 1413/// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers. 1414/// This should only be called when the current token is known to be part of 1415/// simple-type-specifier. 1416/// 1417/// simple-type-specifier: 1418/// '::'[opt] nested-name-specifier[opt] type-name 1419/// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO] 1420/// char 1421/// wchar_t 1422/// bool 1423/// short 1424/// int 1425/// long 1426/// signed 1427/// unsigned 1428/// float 1429/// double 1430/// void 1431/// [GNU] typeof-specifier 1432/// [C++0x] auto [TODO] 1433/// 1434/// type-name: 1435/// class-name 1436/// enum-name 1437/// typedef-name 1438/// 1439void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) { 1440 DS.SetRangeStart(Tok.getLocation()); 1441 const char *PrevSpec; 1442 unsigned DiagID; 1443 SourceLocation Loc = Tok.getLocation(); 1444 1445 switch (Tok.getKind()) { 1446 case tok::identifier: // foo::bar 1447 case tok::coloncolon: // ::foo::bar 1448 llvm_unreachable("Annotation token should already be formed!"); 1449 default: 1450 llvm_unreachable("Not a simple-type-specifier token!"); 1451 1452 // type-name 1453 case tok::annot_typename: { 1454 if (getTypeAnnotation(Tok)) 1455 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, 1456 getTypeAnnotation(Tok)); 1457 else 1458 DS.SetTypeSpecError(); 1459 1460 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 1461 ConsumeToken(); 1462 1463 // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id' 1464 // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an 1465 // Objective-C interface. If we don't have Objective-C or a '<', this is 1466 // just a normal reference to a typedef name. 1467 if (Tok.is(tok::less) && getLangOpts().ObjC1) 1468 ParseObjCProtocolQualifiers(DS); 1469 1470 DS.Finish(Diags, PP); 1471 return; 1472 } 1473 1474 // builtin types 1475 case tok::kw_short: 1476 DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID); 1477 break; 1478 case tok::kw_long: 1479 DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, DiagID); 1480 break; 1481 case tok::kw___int64: 1482 DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, DiagID); 1483 break; 1484 case tok::kw_signed: 1485 DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID); 1486 break; 1487 case tok::kw_unsigned: 1488 DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, DiagID); 1489 break; 1490 case tok::kw_void: 1491 DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID); 1492 break; 1493 case tok::kw_char: 1494 DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID); 1495 break; 1496 case tok::kw_int: 1497 DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID); 1498 break; 1499 case tok::kw___int128: 1500 DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec, DiagID); 1501 break; 1502 case tok::kw_half: 1503 DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec, DiagID); 1504 break; 1505 case tok::kw_float: 1506 DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID); 1507 break; 1508 case tok::kw_double: 1509 DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID); 1510 break; 1511 case tok::kw_wchar_t: 1512 DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID); 1513 break; 1514 case tok::kw_char16_t: 1515 DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID); 1516 break; 1517 case tok::kw_char32_t: 1518 DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID); 1519 break; 1520 case tok::kw_bool: 1521 DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID); 1522 break; 1523 case tok::annot_decltype: 1524 case tok::kw_decltype: 1525 DS.SetRangeEnd(ParseDecltypeSpecifier(DS)); 1526 return DS.Finish(Diags, PP); 1527 1528 // GNU typeof support. 1529 case tok::kw_typeof: 1530 ParseTypeofSpecifier(DS); 1531 DS.Finish(Diags, PP); 1532 return; 1533 } 1534 if (Tok.is(tok::annot_typename)) 1535 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 1536 else 1537 DS.SetRangeEnd(Tok.getLocation()); 1538 ConsumeToken(); 1539 DS.Finish(Diags, PP); 1540} 1541 1542/// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++ 1543/// [dcl.name]), which is a non-empty sequence of type-specifiers, 1544/// e.g., "const short int". Note that the DeclSpec is *not* finished 1545/// by parsing the type-specifier-seq, because these sequences are 1546/// typically followed by some form of declarator. Returns true and 1547/// emits diagnostics if this is not a type-specifier-seq, false 1548/// otherwise. 1549/// 1550/// type-specifier-seq: [C++ 8.1] 1551/// type-specifier type-specifier-seq[opt] 1552/// 1553bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) { 1554 ParseSpecifierQualifierList(DS, AS_none, DSC_type_specifier); 1555 DS.Finish(Diags, PP); 1556 return false; 1557} 1558 1559/// \brief Finish parsing a C++ unqualified-id that is a template-id of 1560/// some form. 1561/// 1562/// This routine is invoked when a '<' is encountered after an identifier or 1563/// operator-function-id is parsed by \c ParseUnqualifiedId() to determine 1564/// whether the unqualified-id is actually a template-id. This routine will 1565/// then parse the template arguments and form the appropriate template-id to 1566/// return to the caller. 1567/// 1568/// \param SS the nested-name-specifier that precedes this template-id, if 1569/// we're actually parsing a qualified-id. 1570/// 1571/// \param Name for constructor and destructor names, this is the actual 1572/// identifier that may be a template-name. 1573/// 1574/// \param NameLoc the location of the class-name in a constructor or 1575/// destructor. 1576/// 1577/// \param EnteringContext whether we're entering the scope of the 1578/// nested-name-specifier. 1579/// 1580/// \param ObjectType if this unqualified-id occurs within a member access 1581/// expression, the type of the base object whose member is being accessed. 1582/// 1583/// \param Id as input, describes the template-name or operator-function-id 1584/// that precedes the '<'. If template arguments were parsed successfully, 1585/// will be updated with the template-id. 1586/// 1587/// \param AssumeTemplateId When true, this routine will assume that the name 1588/// refers to a template without performing name lookup to verify. 1589/// 1590/// \returns true if a parse error occurred, false otherwise. 1591bool Parser::ParseUnqualifiedIdTemplateId(CXXScopeSpec &SS, 1592 SourceLocation TemplateKWLoc, 1593 IdentifierInfo *Name, 1594 SourceLocation NameLoc, 1595 bool EnteringContext, 1596 ParsedType ObjectType, 1597 UnqualifiedId &Id, 1598 bool AssumeTemplateId) { 1599 assert((AssumeTemplateId || Tok.is(tok::less)) && 1600 "Expected '<' to finish parsing a template-id"); 1601 1602 TemplateTy Template; 1603 TemplateNameKind TNK = TNK_Non_template; 1604 switch (Id.getKind()) { 1605 case UnqualifiedId::IK_Identifier: 1606 case UnqualifiedId::IK_OperatorFunctionId: 1607 case UnqualifiedId::IK_LiteralOperatorId: 1608 if (AssumeTemplateId) { 1609 TNK = Actions.ActOnDependentTemplateName(getCurScope(), SS, TemplateKWLoc, 1610 Id, ObjectType, EnteringContext, 1611 Template); 1612 if (TNK == TNK_Non_template) 1613 return true; 1614 } else { 1615 bool MemberOfUnknownSpecialization; 1616 TNK = Actions.isTemplateName(getCurScope(), SS, 1617 TemplateKWLoc.isValid(), Id, 1618 ObjectType, EnteringContext, Template, 1619 MemberOfUnknownSpecialization); 1620 1621 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization && 1622 ObjectType && IsTemplateArgumentList()) { 1623 // We have something like t->getAs<T>(), where getAs is a 1624 // member of an unknown specialization. However, this will only 1625 // parse correctly as a template, so suggest the keyword 'template' 1626 // before 'getAs' and treat this as a dependent template name. 1627 std::string Name; 1628 if (Id.getKind() == UnqualifiedId::IK_Identifier) 1629 Name = Id.Identifier->getName(); 1630 else { 1631 Name = "operator "; 1632 if (Id.getKind() == UnqualifiedId::IK_OperatorFunctionId) 1633 Name += getOperatorSpelling(Id.OperatorFunctionId.Operator); 1634 else 1635 Name += Id.Identifier->getName(); 1636 } 1637 Diag(Id.StartLocation, diag::err_missing_dependent_template_keyword) 1638 << Name 1639 << FixItHint::CreateInsertion(Id.StartLocation, "template "); 1640 TNK = Actions.ActOnDependentTemplateName(getCurScope(), 1641 SS, TemplateKWLoc, Id, 1642 ObjectType, EnteringContext, 1643 Template); 1644 if (TNK == TNK_Non_template) 1645 return true; 1646 } 1647 } 1648 break; 1649 1650 case UnqualifiedId::IK_ConstructorName: { 1651 UnqualifiedId TemplateName; 1652 bool MemberOfUnknownSpecialization; 1653 TemplateName.setIdentifier(Name, NameLoc); 1654 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(), 1655 TemplateName, ObjectType, 1656 EnteringContext, Template, 1657 MemberOfUnknownSpecialization); 1658 break; 1659 } 1660 1661 case UnqualifiedId::IK_DestructorName: { 1662 UnqualifiedId TemplateName; 1663 bool MemberOfUnknownSpecialization; 1664 TemplateName.setIdentifier(Name, NameLoc); 1665 if (ObjectType) { 1666 TNK = Actions.ActOnDependentTemplateName(getCurScope(), 1667 SS, TemplateKWLoc, TemplateName, 1668 ObjectType, EnteringContext, 1669 Template); 1670 if (TNK == TNK_Non_template) 1671 return true; 1672 } else { 1673 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(), 1674 TemplateName, ObjectType, 1675 EnteringContext, Template, 1676 MemberOfUnknownSpecialization); 1677 1678 if (TNK == TNK_Non_template && !Id.DestructorName.get()) { 1679 Diag(NameLoc, diag::err_destructor_template_id) 1680 << Name << SS.getRange(); 1681 return true; 1682 } 1683 } 1684 break; 1685 } 1686 1687 default: 1688 return false; 1689 } 1690 1691 if (TNK == TNK_Non_template) 1692 return false; 1693 1694 // Parse the enclosed template argument list. 1695 SourceLocation LAngleLoc, RAngleLoc; 1696 TemplateArgList TemplateArgs; 1697 if (Tok.is(tok::less) && 1698 ParseTemplateIdAfterTemplateName(Template, Id.StartLocation, 1699 SS, true, LAngleLoc, 1700 TemplateArgs, 1701 RAngleLoc)) 1702 return true; 1703 1704 if (Id.getKind() == UnqualifiedId::IK_Identifier || 1705 Id.getKind() == UnqualifiedId::IK_OperatorFunctionId || 1706 Id.getKind() == UnqualifiedId::IK_LiteralOperatorId) { 1707 // Form a parsed representation of the template-id to be stored in the 1708 // UnqualifiedId. 1709 TemplateIdAnnotation *TemplateId 1710 = TemplateIdAnnotation::Allocate(TemplateArgs.size(), TemplateIds); 1711 1712 if (Id.getKind() == UnqualifiedId::IK_Identifier) { 1713 TemplateId->Name = Id.Identifier; 1714 TemplateId->Operator = OO_None; 1715 TemplateId->TemplateNameLoc = Id.StartLocation; 1716 } else { 1717 TemplateId->Name = 0; 1718 TemplateId->Operator = Id.OperatorFunctionId.Operator; 1719 TemplateId->TemplateNameLoc = Id.StartLocation; 1720 } 1721 1722 TemplateId->SS = SS; 1723 TemplateId->TemplateKWLoc = TemplateKWLoc; 1724 TemplateId->Template = Template; 1725 TemplateId->Kind = TNK; 1726 TemplateId->LAngleLoc = LAngleLoc; 1727 TemplateId->RAngleLoc = RAngleLoc; 1728 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs(); 1729 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); 1730 Arg != ArgEnd; ++Arg) 1731 Args[Arg] = TemplateArgs[Arg]; 1732 1733 Id.setTemplateId(TemplateId); 1734 return false; 1735 } 1736 1737 // Bundle the template arguments together. 1738 ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(), 1739 TemplateArgs.size()); 1740 1741 // Constructor and destructor names. 1742 TypeResult Type 1743 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc, 1744 Template, NameLoc, 1745 LAngleLoc, TemplateArgsPtr, RAngleLoc, 1746 /*IsCtorOrDtorName=*/true); 1747 if (Type.isInvalid()) 1748 return true; 1749 1750 if (Id.getKind() == UnqualifiedId::IK_ConstructorName) 1751 Id.setConstructorName(Type.get(), NameLoc, RAngleLoc); 1752 else 1753 Id.setDestructorName(Id.StartLocation, Type.get(), RAngleLoc); 1754 1755 return false; 1756} 1757 1758/// \brief Parse an operator-function-id or conversion-function-id as part 1759/// of a C++ unqualified-id. 1760/// 1761/// This routine is responsible only for parsing the operator-function-id or 1762/// conversion-function-id; it does not handle template arguments in any way. 1763/// 1764/// \code 1765/// operator-function-id: [C++ 13.5] 1766/// 'operator' operator 1767/// 1768/// operator: one of 1769/// new delete new[] delete[] 1770/// + - * / % ^ & | ~ 1771/// ! = < > += -= *= /= %= 1772/// ^= &= |= << >> >>= <<= == != 1773/// <= >= && || ++ -- , ->* -> 1774/// () [] 1775/// 1776/// conversion-function-id: [C++ 12.3.2] 1777/// operator conversion-type-id 1778/// 1779/// conversion-type-id: 1780/// type-specifier-seq conversion-declarator[opt] 1781/// 1782/// conversion-declarator: 1783/// ptr-operator conversion-declarator[opt] 1784/// \endcode 1785/// 1786/// \param The nested-name-specifier that preceded this unqualified-id. If 1787/// non-empty, then we are parsing the unqualified-id of a qualified-id. 1788/// 1789/// \param EnteringContext whether we are entering the scope of the 1790/// nested-name-specifier. 1791/// 1792/// \param ObjectType if this unqualified-id occurs within a member access 1793/// expression, the type of the base object whose member is being accessed. 1794/// 1795/// \param Result on a successful parse, contains the parsed unqualified-id. 1796/// 1797/// \returns true if parsing fails, false otherwise. 1798bool Parser::ParseUnqualifiedIdOperator(CXXScopeSpec &SS, bool EnteringContext, 1799 ParsedType ObjectType, 1800 UnqualifiedId &Result) { 1801 assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword"); 1802 1803 // Consume the 'operator' keyword. 1804 SourceLocation KeywordLoc = ConsumeToken(); 1805 1806 // Determine what kind of operator name we have. 1807 unsigned SymbolIdx = 0; 1808 SourceLocation SymbolLocations[3]; 1809 OverloadedOperatorKind Op = OO_None; 1810 switch (Tok.getKind()) { 1811 case tok::kw_new: 1812 case tok::kw_delete: { 1813 bool isNew = Tok.getKind() == tok::kw_new; 1814 // Consume the 'new' or 'delete'. 1815 SymbolLocations[SymbolIdx++] = ConsumeToken(); 1816 // Check for array new/delete. 1817 if (Tok.is(tok::l_square) && 1818 (!getLangOpts().CPlusPlus0x || NextToken().isNot(tok::l_square))) { 1819 // Consume the '[' and ']'. 1820 BalancedDelimiterTracker T(*this, tok::l_square); 1821 T.consumeOpen(); 1822 T.consumeClose(); 1823 if (T.getCloseLocation().isInvalid()) 1824 return true; 1825 1826 SymbolLocations[SymbolIdx++] = T.getOpenLocation(); 1827 SymbolLocations[SymbolIdx++] = T.getCloseLocation(); 1828 Op = isNew? OO_Array_New : OO_Array_Delete; 1829 } else { 1830 Op = isNew? OO_New : OO_Delete; 1831 } 1832 break; 1833 } 1834 1835#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 1836 case tok::Token: \ 1837 SymbolLocations[SymbolIdx++] = ConsumeToken(); \ 1838 Op = OO_##Name; \ 1839 break; 1840#define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly) 1841#include "clang/Basic/OperatorKinds.def" 1842 1843 case tok::l_paren: { 1844 // Consume the '(' and ')'. 1845 BalancedDelimiterTracker T(*this, tok::l_paren); 1846 T.consumeOpen(); 1847 T.consumeClose(); 1848 if (T.getCloseLocation().isInvalid()) 1849 return true; 1850 1851 SymbolLocations[SymbolIdx++] = T.getOpenLocation(); 1852 SymbolLocations[SymbolIdx++] = T.getCloseLocation(); 1853 Op = OO_Call; 1854 break; 1855 } 1856 1857 case tok::l_square: { 1858 // Consume the '[' and ']'. 1859 BalancedDelimiterTracker T(*this, tok::l_square); 1860 T.consumeOpen(); 1861 T.consumeClose(); 1862 if (T.getCloseLocation().isInvalid()) 1863 return true; 1864 1865 SymbolLocations[SymbolIdx++] = T.getOpenLocation(); 1866 SymbolLocations[SymbolIdx++] = T.getCloseLocation(); 1867 Op = OO_Subscript; 1868 break; 1869 } 1870 1871 case tok::code_completion: { 1872 // Code completion for the operator name. 1873 Actions.CodeCompleteOperatorName(getCurScope()); 1874 cutOffParsing(); 1875 // Don't try to parse any further. 1876 return true; 1877 } 1878 1879 default: 1880 break; 1881 } 1882 1883 if (Op != OO_None) { 1884 // We have parsed an operator-function-id. 1885 Result.setOperatorFunctionId(KeywordLoc, Op, SymbolLocations); 1886 return false; 1887 } 1888 1889 // Parse a literal-operator-id. 1890 // 1891 // literal-operator-id: [C++0x 13.5.8] 1892 // operator "" identifier 1893 1894 if (getLangOpts().CPlusPlus0x && isTokenStringLiteral()) { 1895 Diag(Tok.getLocation(), diag::warn_cxx98_compat_literal_operator); 1896 1897 SourceLocation DiagLoc; 1898 unsigned DiagId = 0; 1899 1900 // We're past translation phase 6, so perform string literal concatenation 1901 // before checking for "". 1902 llvm::SmallVector<Token, 4> Toks; 1903 llvm::SmallVector<SourceLocation, 4> TokLocs; 1904 while (isTokenStringLiteral()) { 1905 if (!Tok.is(tok::string_literal) && !DiagId) { 1906 DiagLoc = Tok.getLocation(); 1907 DiagId = diag::err_literal_operator_string_prefix; 1908 } 1909 Toks.push_back(Tok); 1910 TokLocs.push_back(ConsumeStringToken()); 1911 } 1912 1913 StringLiteralParser Literal(Toks.data(), Toks.size(), PP); 1914 if (Literal.hadError) 1915 return true; 1916 1917 // Grab the literal operator's suffix, which will be either the next token 1918 // or a ud-suffix from the string literal. 1919 IdentifierInfo *II = 0; 1920 SourceLocation SuffixLoc; 1921 if (!Literal.getUDSuffix().empty()) { 1922 II = &PP.getIdentifierTable().get(Literal.getUDSuffix()); 1923 SuffixLoc = 1924 Lexer::AdvanceToTokenCharacter(TokLocs[Literal.getUDSuffixToken()], 1925 Literal.getUDSuffixOffset(), 1926 PP.getSourceManager(), getLangOpts()); 1927 // This form is not permitted by the standard (yet). 1928 DiagLoc = SuffixLoc; 1929 DiagId = diag::err_literal_operator_missing_space; 1930 } else if (Tok.is(tok::identifier)) { 1931 II = Tok.getIdentifierInfo(); 1932 SuffixLoc = ConsumeToken(); 1933 TokLocs.push_back(SuffixLoc); 1934 } else { 1935 Diag(Tok.getLocation(), diag::err_expected_ident); 1936 return true; 1937 } 1938 1939 // The string literal must be empty. 1940 if (!Literal.GetString().empty() || Literal.Pascal) { 1941 DiagLoc = TokLocs.front(); 1942 DiagId = diag::err_literal_operator_string_not_empty; 1943 } 1944 1945 if (DiagId) { 1946 // This isn't a valid literal-operator-id, but we think we know 1947 // what the user meant. Tell them what they should have written. 1948 llvm::SmallString<32> Str; 1949 Str += "\"\" "; 1950 Str += II->getName(); 1951 Diag(DiagLoc, DiagId) << FixItHint::CreateReplacement( 1952 SourceRange(TokLocs.front(), TokLocs.back()), Str); 1953 } 1954 1955 Result.setLiteralOperatorId(II, KeywordLoc, SuffixLoc); 1956 return false; 1957 } 1958 1959 // Parse a conversion-function-id. 1960 // 1961 // conversion-function-id: [C++ 12.3.2] 1962 // operator conversion-type-id 1963 // 1964 // conversion-type-id: 1965 // type-specifier-seq conversion-declarator[opt] 1966 // 1967 // conversion-declarator: 1968 // ptr-operator conversion-declarator[opt] 1969 1970 // Parse the type-specifier-seq. 1971 DeclSpec DS(AttrFactory); 1972 if (ParseCXXTypeSpecifierSeq(DS)) // FIXME: ObjectType? 1973 return true; 1974 1975 // Parse the conversion-declarator, which is merely a sequence of 1976 // ptr-operators. 1977 Declarator D(DS, Declarator::TypeNameContext); 1978 ParseDeclaratorInternal(D, /*DirectDeclParser=*/0); 1979 1980 // Finish up the type. 1981 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), D); 1982 if (Ty.isInvalid()) 1983 return true; 1984 1985 // Note that this is a conversion-function-id. 1986 Result.setConversionFunctionId(KeywordLoc, Ty.get(), 1987 D.getSourceRange().getEnd()); 1988 return false; 1989} 1990 1991/// \brief Parse a C++ unqualified-id (or a C identifier), which describes the 1992/// name of an entity. 1993/// 1994/// \code 1995/// unqualified-id: [C++ expr.prim.general] 1996/// identifier 1997/// operator-function-id 1998/// conversion-function-id 1999/// [C++0x] literal-operator-id [TODO] 2000/// ~ class-name 2001/// template-id 2002/// 2003/// \endcode 2004/// 2005/// \param The nested-name-specifier that preceded this unqualified-id. If 2006/// non-empty, then we are parsing the unqualified-id of a qualified-id. 2007/// 2008/// \param EnteringContext whether we are entering the scope of the 2009/// nested-name-specifier. 2010/// 2011/// \param AllowDestructorName whether we allow parsing of a destructor name. 2012/// 2013/// \param AllowConstructorName whether we allow parsing a constructor name. 2014/// 2015/// \param ObjectType if this unqualified-id occurs within a member access 2016/// expression, the type of the base object whose member is being accessed. 2017/// 2018/// \param Result on a successful parse, contains the parsed unqualified-id. 2019/// 2020/// \returns true if parsing fails, false otherwise. 2021bool Parser::ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext, 2022 bool AllowDestructorName, 2023 bool AllowConstructorName, 2024 ParsedType ObjectType, 2025 SourceLocation& TemplateKWLoc, 2026 UnqualifiedId &Result) { 2027 2028 // Handle 'A::template B'. This is for template-ids which have not 2029 // already been annotated by ParseOptionalCXXScopeSpecifier(). 2030 bool TemplateSpecified = false; 2031 if (getLangOpts().CPlusPlus && Tok.is(tok::kw_template) && 2032 (ObjectType || SS.isSet())) { 2033 TemplateSpecified = true; 2034 TemplateKWLoc = ConsumeToken(); 2035 } 2036 2037 // unqualified-id: 2038 // identifier 2039 // template-id (when it hasn't already been annotated) 2040 if (Tok.is(tok::identifier)) { 2041 // Consume the identifier. 2042 IdentifierInfo *Id = Tok.getIdentifierInfo(); 2043 SourceLocation IdLoc = ConsumeToken(); 2044 2045 if (!getLangOpts().CPlusPlus) { 2046 // If we're not in C++, only identifiers matter. Record the 2047 // identifier and return. 2048 Result.setIdentifier(Id, IdLoc); 2049 return false; 2050 } 2051 2052 if (AllowConstructorName && 2053 Actions.isCurrentClassName(*Id, getCurScope(), &SS)) { 2054 // We have parsed a constructor name. 2055 ParsedType Ty = Actions.getTypeName(*Id, IdLoc, getCurScope(), 2056 &SS, false, false, 2057 ParsedType(), 2058 /*IsCtorOrDtorName=*/true, 2059 /*NonTrivialTypeSourceInfo=*/true); 2060 Result.setConstructorName(Ty, IdLoc, IdLoc); 2061 } else { 2062 // We have parsed an identifier. 2063 Result.setIdentifier(Id, IdLoc); 2064 } 2065 2066 // If the next token is a '<', we may have a template. 2067 if (TemplateSpecified || Tok.is(tok::less)) 2068 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc, Id, IdLoc, 2069 EnteringContext, ObjectType, 2070 Result, TemplateSpecified); 2071 2072 return false; 2073 } 2074 2075 // unqualified-id: 2076 // template-id (already parsed and annotated) 2077 if (Tok.is(tok::annot_template_id)) { 2078 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 2079 2080 // If the template-name names the current class, then this is a constructor 2081 if (AllowConstructorName && TemplateId->Name && 2082 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) { 2083 if (SS.isSet()) { 2084 // C++ [class.qual]p2 specifies that a qualified template-name 2085 // is taken as the constructor name where a constructor can be 2086 // declared. Thus, the template arguments are extraneous, so 2087 // complain about them and remove them entirely. 2088 Diag(TemplateId->TemplateNameLoc, 2089 diag::err_out_of_line_constructor_template_id) 2090 << TemplateId->Name 2091 << FixItHint::CreateRemoval( 2092 SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)); 2093 ParsedType Ty = Actions.getTypeName(*TemplateId->Name, 2094 TemplateId->TemplateNameLoc, 2095 getCurScope(), 2096 &SS, false, false, 2097 ParsedType(), 2098 /*IsCtorOrDtorName=*/true, 2099 /*NontrivialTypeSourceInfo=*/true); 2100 Result.setConstructorName(Ty, TemplateId->TemplateNameLoc, 2101 TemplateId->RAngleLoc); 2102 ConsumeToken(); 2103 return false; 2104 } 2105 2106 Result.setConstructorTemplateId(TemplateId); 2107 ConsumeToken(); 2108 return false; 2109 } 2110 2111 // We have already parsed a template-id; consume the annotation token as 2112 // our unqualified-id. 2113 Result.setTemplateId(TemplateId); 2114 TemplateKWLoc = TemplateId->TemplateKWLoc; 2115 ConsumeToken(); 2116 return false; 2117 } 2118 2119 // unqualified-id: 2120 // operator-function-id 2121 // conversion-function-id 2122 if (Tok.is(tok::kw_operator)) { 2123 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, Result)) 2124 return true; 2125 2126 // If we have an operator-function-id or a literal-operator-id and the next 2127 // token is a '<', we may have a 2128 // 2129 // template-id: 2130 // operator-function-id < template-argument-list[opt] > 2131 if ((Result.getKind() == UnqualifiedId::IK_OperatorFunctionId || 2132 Result.getKind() == UnqualifiedId::IK_LiteralOperatorId) && 2133 (TemplateSpecified || Tok.is(tok::less))) 2134 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc, 2135 0, SourceLocation(), 2136 EnteringContext, ObjectType, 2137 Result, TemplateSpecified); 2138 2139 return false; 2140 } 2141 2142 if (getLangOpts().CPlusPlus && 2143 (AllowDestructorName || SS.isSet()) && Tok.is(tok::tilde)) { 2144 // C++ [expr.unary.op]p10: 2145 // There is an ambiguity in the unary-expression ~X(), where X is a 2146 // class-name. The ambiguity is resolved in favor of treating ~ as a 2147 // unary complement rather than treating ~X as referring to a destructor. 2148 2149 // Parse the '~'. 2150 SourceLocation TildeLoc = ConsumeToken(); 2151 2152 if (SS.isEmpty() && Tok.is(tok::kw_decltype)) { 2153 DeclSpec DS(AttrFactory); 2154 SourceLocation EndLoc = ParseDecltypeSpecifier(DS); 2155 if (ParsedType Type = Actions.getDestructorType(DS, ObjectType)) { 2156 Result.setDestructorName(TildeLoc, Type, EndLoc); 2157 return false; 2158 } 2159 return true; 2160 } 2161 2162 // Parse the class-name. 2163 if (Tok.isNot(tok::identifier)) { 2164 Diag(Tok, diag::err_destructor_tilde_identifier); 2165 return true; 2166 } 2167 2168 // Parse the class-name (or template-name in a simple-template-id). 2169 IdentifierInfo *ClassName = Tok.getIdentifierInfo(); 2170 SourceLocation ClassNameLoc = ConsumeToken(); 2171 2172 if (TemplateSpecified || Tok.is(tok::less)) { 2173 Result.setDestructorName(TildeLoc, ParsedType(), ClassNameLoc); 2174 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc, 2175 ClassName, ClassNameLoc, 2176 EnteringContext, ObjectType, 2177 Result, TemplateSpecified); 2178 } 2179 2180 // Note that this is a destructor name. 2181 ParsedType Ty = Actions.getDestructorName(TildeLoc, *ClassName, 2182 ClassNameLoc, getCurScope(), 2183 SS, ObjectType, 2184 EnteringContext); 2185 if (!Ty) 2186 return true; 2187 2188 Result.setDestructorName(TildeLoc, Ty, ClassNameLoc); 2189 return false; 2190 } 2191 2192 Diag(Tok, diag::err_expected_unqualified_id) 2193 << getLangOpts().CPlusPlus; 2194 return true; 2195} 2196 2197/// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate 2198/// memory in a typesafe manner and call constructors. 2199/// 2200/// This method is called to parse the new expression after the optional :: has 2201/// been already parsed. If the :: was present, "UseGlobal" is true and "Start" 2202/// is its location. Otherwise, "Start" is the location of the 'new' token. 2203/// 2204/// new-expression: 2205/// '::'[opt] 'new' new-placement[opt] new-type-id 2206/// new-initializer[opt] 2207/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 2208/// new-initializer[opt] 2209/// 2210/// new-placement: 2211/// '(' expression-list ')' 2212/// 2213/// new-type-id: 2214/// type-specifier-seq new-declarator[opt] 2215/// [GNU] attributes type-specifier-seq new-declarator[opt] 2216/// 2217/// new-declarator: 2218/// ptr-operator new-declarator[opt] 2219/// direct-new-declarator 2220/// 2221/// new-initializer: 2222/// '(' expression-list[opt] ')' 2223/// [C++0x] braced-init-list 2224/// 2225ExprResult 2226Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) { 2227 assert(Tok.is(tok::kw_new) && "expected 'new' token"); 2228 ConsumeToken(); // Consume 'new' 2229 2230 // A '(' now can be a new-placement or the '(' wrapping the type-id in the 2231 // second form of new-expression. It can't be a new-type-id. 2232 2233 ExprVector PlacementArgs(Actions); 2234 SourceLocation PlacementLParen, PlacementRParen; 2235 2236 SourceRange TypeIdParens; 2237 DeclSpec DS(AttrFactory); 2238 Declarator DeclaratorInfo(DS, Declarator::CXXNewContext); 2239 if (Tok.is(tok::l_paren)) { 2240 // If it turns out to be a placement, we change the type location. 2241 BalancedDelimiterTracker T(*this, tok::l_paren); 2242 T.consumeOpen(); 2243 PlacementLParen = T.getOpenLocation(); 2244 if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) { 2245 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2246 return ExprError(); 2247 } 2248 2249 T.consumeClose(); 2250 PlacementRParen = T.getCloseLocation(); 2251 if (PlacementRParen.isInvalid()) { 2252 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2253 return ExprError(); 2254 } 2255 2256 if (PlacementArgs.empty()) { 2257 // Reset the placement locations. There was no placement. 2258 TypeIdParens = T.getRange(); 2259 PlacementLParen = PlacementRParen = SourceLocation(); 2260 } else { 2261 // We still need the type. 2262 if (Tok.is(tok::l_paren)) { 2263 BalancedDelimiterTracker T(*this, tok::l_paren); 2264 T.consumeOpen(); 2265 MaybeParseGNUAttributes(DeclaratorInfo); 2266 ParseSpecifierQualifierList(DS); 2267 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 2268 ParseDeclarator(DeclaratorInfo); 2269 T.consumeClose(); 2270 TypeIdParens = T.getRange(); 2271 } else { 2272 MaybeParseGNUAttributes(DeclaratorInfo); 2273 if (ParseCXXTypeSpecifierSeq(DS)) 2274 DeclaratorInfo.setInvalidType(true); 2275 else { 2276 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 2277 ParseDeclaratorInternal(DeclaratorInfo, 2278 &Parser::ParseDirectNewDeclarator); 2279 } 2280 } 2281 } 2282 } else { 2283 // A new-type-id is a simplified type-id, where essentially the 2284 // direct-declarator is replaced by a direct-new-declarator. 2285 MaybeParseGNUAttributes(DeclaratorInfo); 2286 if (ParseCXXTypeSpecifierSeq(DS)) 2287 DeclaratorInfo.setInvalidType(true); 2288 else { 2289 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 2290 ParseDeclaratorInternal(DeclaratorInfo, 2291 &Parser::ParseDirectNewDeclarator); 2292 } 2293 } 2294 if (DeclaratorInfo.isInvalidType()) { 2295 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2296 return ExprError(); 2297 } 2298 2299 ExprResult Initializer; 2300 2301 if (Tok.is(tok::l_paren)) { 2302 SourceLocation ConstructorLParen, ConstructorRParen; 2303 ExprVector ConstructorArgs(Actions); 2304 BalancedDelimiterTracker T(*this, tok::l_paren); 2305 T.consumeOpen(); 2306 ConstructorLParen = T.getOpenLocation(); 2307 if (Tok.isNot(tok::r_paren)) { 2308 CommaLocsTy CommaLocs; 2309 if (ParseExpressionList(ConstructorArgs, CommaLocs)) { 2310 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2311 return ExprError(); 2312 } 2313 } 2314 T.consumeClose(); 2315 ConstructorRParen = T.getCloseLocation(); 2316 if (ConstructorRParen.isInvalid()) { 2317 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 2318 return ExprError(); 2319 } 2320 Initializer = Actions.ActOnParenListExpr(ConstructorLParen, 2321 ConstructorRParen, 2322 move_arg(ConstructorArgs)); 2323 } else if (Tok.is(tok::l_brace) && getLangOpts().CPlusPlus0x) { 2324 Diag(Tok.getLocation(), 2325 diag::warn_cxx98_compat_generalized_initializer_lists); 2326 Initializer = ParseBraceInitializer(); 2327 } 2328 if (Initializer.isInvalid()) 2329 return Initializer; 2330 2331 return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen, 2332 move_arg(PlacementArgs), PlacementRParen, 2333 TypeIdParens, DeclaratorInfo, Initializer.take()); 2334} 2335 2336/// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be 2337/// passed to ParseDeclaratorInternal. 2338/// 2339/// direct-new-declarator: 2340/// '[' expression ']' 2341/// direct-new-declarator '[' constant-expression ']' 2342/// 2343void Parser::ParseDirectNewDeclarator(Declarator &D) { 2344 // Parse the array dimensions. 2345 bool first = true; 2346 while (Tok.is(tok::l_square)) { 2347 // An array-size expression can't start with a lambda. 2348 if (CheckProhibitedCXX11Attribute()) 2349 continue; 2350 2351 BalancedDelimiterTracker T(*this, tok::l_square); 2352 T.consumeOpen(); 2353 2354 ExprResult Size(first ? ParseExpression() 2355 : ParseConstantExpression()); 2356 if (Size.isInvalid()) { 2357 // Recover 2358 SkipUntil(tok::r_square); 2359 return; 2360 } 2361 first = false; 2362 2363 T.consumeClose(); 2364 2365 // Attributes here appertain to the array type. C++11 [expr.new]p5. 2366 ParsedAttributes Attrs(AttrFactory); 2367 MaybeParseCXX0XAttributes(Attrs); 2368 2369 D.AddTypeInfo(DeclaratorChunk::getArray(0, 2370 /*static=*/false, /*star=*/false, 2371 Size.release(), 2372 T.getOpenLocation(), 2373 T.getCloseLocation()), 2374 Attrs, T.getCloseLocation()); 2375 2376 if (T.getCloseLocation().isInvalid()) 2377 return; 2378 } 2379} 2380 2381/// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id. 2382/// This ambiguity appears in the syntax of the C++ new operator. 2383/// 2384/// new-expression: 2385/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 2386/// new-initializer[opt] 2387/// 2388/// new-placement: 2389/// '(' expression-list ')' 2390/// 2391bool Parser::ParseExpressionListOrTypeId( 2392 SmallVectorImpl<Expr*> &PlacementArgs, 2393 Declarator &D) { 2394 // The '(' was already consumed. 2395 if (isTypeIdInParens()) { 2396 ParseSpecifierQualifierList(D.getMutableDeclSpec()); 2397 D.SetSourceRange(D.getDeclSpec().getSourceRange()); 2398 ParseDeclarator(D); 2399 return D.isInvalidType(); 2400 } 2401 2402 // It's not a type, it has to be an expression list. 2403 // Discard the comma locations - ActOnCXXNew has enough parameters. 2404 CommaLocsTy CommaLocs; 2405 return ParseExpressionList(PlacementArgs, CommaLocs); 2406} 2407 2408/// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used 2409/// to free memory allocated by new. 2410/// 2411/// This method is called to parse the 'delete' expression after the optional 2412/// '::' has been already parsed. If the '::' was present, "UseGlobal" is true 2413/// and "Start" is its location. Otherwise, "Start" is the location of the 2414/// 'delete' token. 2415/// 2416/// delete-expression: 2417/// '::'[opt] 'delete' cast-expression 2418/// '::'[opt] 'delete' '[' ']' cast-expression 2419ExprResult 2420Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) { 2421 assert(Tok.is(tok::kw_delete) && "Expected 'delete' keyword"); 2422 ConsumeToken(); // Consume 'delete' 2423 2424 // Array delete? 2425 bool ArrayDelete = false; 2426 if (Tok.is(tok::l_square) && NextToken().is(tok::r_square)) { 2427 // FIXME: This could be the start of a lambda-expression. We should 2428 // disambiguate this, but that will require arbitrary lookahead if 2429 // the next token is '(': 2430 // delete [](int*){ /* ... */ 2431 ArrayDelete = true; 2432 BalancedDelimiterTracker T(*this, tok::l_square); 2433 2434 T.consumeOpen(); 2435 T.consumeClose(); 2436 if (T.getCloseLocation().isInvalid()) 2437 return ExprError(); 2438 } 2439 2440 ExprResult Operand(ParseCastExpression(false)); 2441 if (Operand.isInvalid()) 2442 return move(Operand); 2443 2444 return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, Operand.take()); 2445} 2446 2447static UnaryTypeTrait UnaryTypeTraitFromTokKind(tok::TokenKind kind) { 2448 switch(kind) { 2449 default: llvm_unreachable("Not a known unary type trait."); 2450 case tok::kw___has_nothrow_assign: return UTT_HasNothrowAssign; 2451 case tok::kw___has_nothrow_constructor: return UTT_HasNothrowConstructor; 2452 case tok::kw___has_nothrow_copy: return UTT_HasNothrowCopy; 2453 case tok::kw___has_trivial_assign: return UTT_HasTrivialAssign; 2454 case tok::kw___has_trivial_constructor: 2455 return UTT_HasTrivialDefaultConstructor; 2456 case tok::kw___has_trivial_copy: return UTT_HasTrivialCopy; 2457 case tok::kw___has_trivial_destructor: return UTT_HasTrivialDestructor; 2458 case tok::kw___has_virtual_destructor: return UTT_HasVirtualDestructor; 2459 case tok::kw___is_abstract: return UTT_IsAbstract; 2460 case tok::kw___is_arithmetic: return UTT_IsArithmetic; 2461 case tok::kw___is_array: return UTT_IsArray; 2462 case tok::kw___is_class: return UTT_IsClass; 2463 case tok::kw___is_complete_type: return UTT_IsCompleteType; 2464 case tok::kw___is_compound: return UTT_IsCompound; 2465 case tok::kw___is_const: return UTT_IsConst; 2466 case tok::kw___is_empty: return UTT_IsEmpty; 2467 case tok::kw___is_enum: return UTT_IsEnum; 2468 case tok::kw___is_final: return UTT_IsFinal; 2469 case tok::kw___is_floating_point: return UTT_IsFloatingPoint; 2470 case tok::kw___is_function: return UTT_IsFunction; 2471 case tok::kw___is_fundamental: return UTT_IsFundamental; 2472 case tok::kw___is_integral: return UTT_IsIntegral; 2473 case tok::kw___is_lvalue_reference: return UTT_IsLvalueReference; 2474 case tok::kw___is_member_function_pointer: return UTT_IsMemberFunctionPointer; 2475 case tok::kw___is_member_object_pointer: return UTT_IsMemberObjectPointer; 2476 case tok::kw___is_member_pointer: return UTT_IsMemberPointer; 2477 case tok::kw___is_object: return UTT_IsObject; 2478 case tok::kw___is_literal: return UTT_IsLiteral; 2479 case tok::kw___is_literal_type: return UTT_IsLiteral; 2480 case tok::kw___is_pod: return UTT_IsPOD; 2481 case tok::kw___is_pointer: return UTT_IsPointer; 2482 case tok::kw___is_polymorphic: return UTT_IsPolymorphic; 2483 case tok::kw___is_reference: return UTT_IsReference; 2484 case tok::kw___is_rvalue_reference: return UTT_IsRvalueReference; 2485 case tok::kw___is_scalar: return UTT_IsScalar; 2486 case tok::kw___is_signed: return UTT_IsSigned; 2487 case tok::kw___is_standard_layout: return UTT_IsStandardLayout; 2488 case tok::kw___is_trivial: return UTT_IsTrivial; 2489 case tok::kw___is_trivially_copyable: return UTT_IsTriviallyCopyable; 2490 case tok::kw___is_union: return UTT_IsUnion; 2491 case tok::kw___is_unsigned: return UTT_IsUnsigned; 2492 case tok::kw___is_void: return UTT_IsVoid; 2493 case tok::kw___is_volatile: return UTT_IsVolatile; 2494 } 2495} 2496 2497static BinaryTypeTrait BinaryTypeTraitFromTokKind(tok::TokenKind kind) { 2498 switch(kind) { 2499 default: llvm_unreachable("Not a known binary type trait"); 2500 case tok::kw___is_base_of: return BTT_IsBaseOf; 2501 case tok::kw___is_convertible: return BTT_IsConvertible; 2502 case tok::kw___is_same: return BTT_IsSame; 2503 case tok::kw___builtin_types_compatible_p: return BTT_TypeCompatible; 2504 case tok::kw___is_convertible_to: return BTT_IsConvertibleTo; 2505 case tok::kw___is_trivially_assignable: return BTT_IsTriviallyAssignable; 2506 } 2507} 2508 2509static TypeTrait TypeTraitFromTokKind(tok::TokenKind kind) { 2510 switch (kind) { 2511 default: llvm_unreachable("Not a known type trait"); 2512 case tok::kw___is_trivially_constructible: 2513 return TT_IsTriviallyConstructible; 2514 } 2515} 2516 2517static ArrayTypeTrait ArrayTypeTraitFromTokKind(tok::TokenKind kind) { 2518 switch(kind) { 2519 default: llvm_unreachable("Not a known binary type trait"); 2520 case tok::kw___array_rank: return ATT_ArrayRank; 2521 case tok::kw___array_extent: return ATT_ArrayExtent; 2522 } 2523} 2524 2525static ExpressionTrait ExpressionTraitFromTokKind(tok::TokenKind kind) { 2526 switch(kind) { 2527 default: llvm_unreachable("Not a known unary expression trait."); 2528 case tok::kw___is_lvalue_expr: return ET_IsLValueExpr; 2529 case tok::kw___is_rvalue_expr: return ET_IsRValueExpr; 2530 } 2531} 2532 2533/// ParseUnaryTypeTrait - Parse the built-in unary type-trait 2534/// pseudo-functions that allow implementation of the TR1/C++0x type traits 2535/// templates. 2536/// 2537/// primary-expression: 2538/// [GNU] unary-type-trait '(' type-id ')' 2539/// 2540ExprResult Parser::ParseUnaryTypeTrait() { 2541 UnaryTypeTrait UTT = UnaryTypeTraitFromTokKind(Tok.getKind()); 2542 SourceLocation Loc = ConsumeToken(); 2543 2544 BalancedDelimiterTracker T(*this, tok::l_paren); 2545 if (T.expectAndConsume(diag::err_expected_lparen)) 2546 return ExprError(); 2547 2548 // FIXME: Error reporting absolutely sucks! If the this fails to parse a type 2549 // there will be cryptic errors about mismatched parentheses and missing 2550 // specifiers. 2551 TypeResult Ty = ParseTypeName(); 2552 2553 T.consumeClose(); 2554 2555 if (Ty.isInvalid()) 2556 return ExprError(); 2557 2558 return Actions.ActOnUnaryTypeTrait(UTT, Loc, Ty.get(), T.getCloseLocation()); 2559} 2560 2561/// ParseBinaryTypeTrait - Parse the built-in binary type-trait 2562/// pseudo-functions that allow implementation of the TR1/C++0x type traits 2563/// templates. 2564/// 2565/// primary-expression: 2566/// [GNU] binary-type-trait '(' type-id ',' type-id ')' 2567/// 2568ExprResult Parser::ParseBinaryTypeTrait() { 2569 BinaryTypeTrait BTT = BinaryTypeTraitFromTokKind(Tok.getKind()); 2570 SourceLocation Loc = ConsumeToken(); 2571 2572 BalancedDelimiterTracker T(*this, tok::l_paren); 2573 if (T.expectAndConsume(diag::err_expected_lparen)) 2574 return ExprError(); 2575 2576 TypeResult LhsTy = ParseTypeName(); 2577 if (LhsTy.isInvalid()) { 2578 SkipUntil(tok::r_paren); 2579 return ExprError(); 2580 } 2581 2582 if (ExpectAndConsume(tok::comma, diag::err_expected_comma)) { 2583 SkipUntil(tok::r_paren); 2584 return ExprError(); 2585 } 2586 2587 TypeResult RhsTy = ParseTypeName(); 2588 if (RhsTy.isInvalid()) { 2589 SkipUntil(tok::r_paren); 2590 return ExprError(); 2591 } 2592 2593 T.consumeClose(); 2594 2595 return Actions.ActOnBinaryTypeTrait(BTT, Loc, LhsTy.get(), RhsTy.get(), 2596 T.getCloseLocation()); 2597} 2598 2599/// \brief Parse the built-in type-trait pseudo-functions that allow 2600/// implementation of the TR1/C++11 type traits templates. 2601/// 2602/// primary-expression: 2603/// type-trait '(' type-id-seq ')' 2604/// 2605/// type-id-seq: 2606/// type-id ...[opt] type-id-seq[opt] 2607/// 2608ExprResult Parser::ParseTypeTrait() { 2609 TypeTrait Kind = TypeTraitFromTokKind(Tok.getKind()); 2610 SourceLocation Loc = ConsumeToken(); 2611 2612 BalancedDelimiterTracker Parens(*this, tok::l_paren); 2613 if (Parens.expectAndConsume(diag::err_expected_lparen)) 2614 return ExprError(); 2615 2616 llvm::SmallVector<ParsedType, 2> Args; 2617 do { 2618 // Parse the next type. 2619 TypeResult Ty = ParseTypeName(); 2620 if (Ty.isInvalid()) { 2621 Parens.skipToEnd(); 2622 return ExprError(); 2623 } 2624 2625 // Parse the ellipsis, if present. 2626 if (Tok.is(tok::ellipsis)) { 2627 Ty = Actions.ActOnPackExpansion(Ty.get(), ConsumeToken()); 2628 if (Ty.isInvalid()) { 2629 Parens.skipToEnd(); 2630 return ExprError(); 2631 } 2632 } 2633 2634 // Add this type to the list of arguments. 2635 Args.push_back(Ty.get()); 2636 2637 if (Tok.is(tok::comma)) { 2638 ConsumeToken(); 2639 continue; 2640 } 2641 2642 break; 2643 } while (true); 2644 2645 if (Parens.consumeClose()) 2646 return ExprError(); 2647 2648 return Actions.ActOnTypeTrait(Kind, Loc, Args, Parens.getCloseLocation()); 2649} 2650 2651/// ParseArrayTypeTrait - Parse the built-in array type-trait 2652/// pseudo-functions. 2653/// 2654/// primary-expression: 2655/// [Embarcadero] '__array_rank' '(' type-id ')' 2656/// [Embarcadero] '__array_extent' '(' type-id ',' expression ')' 2657/// 2658ExprResult Parser::ParseArrayTypeTrait() { 2659 ArrayTypeTrait ATT = ArrayTypeTraitFromTokKind(Tok.getKind()); 2660 SourceLocation Loc = ConsumeToken(); 2661 2662 BalancedDelimiterTracker T(*this, tok::l_paren); 2663 if (T.expectAndConsume(diag::err_expected_lparen)) 2664 return ExprError(); 2665 2666 TypeResult Ty = ParseTypeName(); 2667 if (Ty.isInvalid()) { 2668 SkipUntil(tok::comma); 2669 SkipUntil(tok::r_paren); 2670 return ExprError(); 2671 } 2672 2673 switch (ATT) { 2674 case ATT_ArrayRank: { 2675 T.consumeClose(); 2676 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), NULL, 2677 T.getCloseLocation()); 2678 } 2679 case ATT_ArrayExtent: { 2680 if (ExpectAndConsume(tok::comma, diag::err_expected_comma)) { 2681 SkipUntil(tok::r_paren); 2682 return ExprError(); 2683 } 2684 2685 ExprResult DimExpr = ParseExpression(); 2686 T.consumeClose(); 2687 2688 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), DimExpr.get(), 2689 T.getCloseLocation()); 2690 } 2691 } 2692 llvm_unreachable("Invalid ArrayTypeTrait!"); 2693} 2694 2695/// ParseExpressionTrait - Parse built-in expression-trait 2696/// pseudo-functions like __is_lvalue_expr( xxx ). 2697/// 2698/// primary-expression: 2699/// [Embarcadero] expression-trait '(' expression ')' 2700/// 2701ExprResult Parser::ParseExpressionTrait() { 2702 ExpressionTrait ET = ExpressionTraitFromTokKind(Tok.getKind()); 2703 SourceLocation Loc = ConsumeToken(); 2704 2705 BalancedDelimiterTracker T(*this, tok::l_paren); 2706 if (T.expectAndConsume(diag::err_expected_lparen)) 2707 return ExprError(); 2708 2709 ExprResult Expr = ParseExpression(); 2710 2711 T.consumeClose(); 2712 2713 return Actions.ActOnExpressionTrait(ET, Loc, Expr.get(), 2714 T.getCloseLocation()); 2715} 2716 2717 2718/// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a 2719/// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate 2720/// based on the context past the parens. 2721ExprResult 2722Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType, 2723 ParsedType &CastTy, 2724 BalancedDelimiterTracker &Tracker) { 2725 assert(getLangOpts().CPlusPlus && "Should only be called for C++!"); 2726 assert(ExprType == CastExpr && "Compound literals are not ambiguous!"); 2727 assert(isTypeIdInParens() && "Not a type-id!"); 2728 2729 ExprResult Result(true); 2730 CastTy = ParsedType(); 2731 2732 // We need to disambiguate a very ugly part of the C++ syntax: 2733 // 2734 // (T())x; - type-id 2735 // (T())*x; - type-id 2736 // (T())/x; - expression 2737 // (T()); - expression 2738 // 2739 // The bad news is that we cannot use the specialized tentative parser, since 2740 // it can only verify that the thing inside the parens can be parsed as 2741 // type-id, it is not useful for determining the context past the parens. 2742 // 2743 // The good news is that the parser can disambiguate this part without 2744 // making any unnecessary Action calls. 2745 // 2746 // It uses a scheme similar to parsing inline methods. The parenthesized 2747 // tokens are cached, the context that follows is determined (possibly by 2748 // parsing a cast-expression), and then we re-introduce the cached tokens 2749 // into the token stream and parse them appropriately. 2750 2751 ParenParseOption ParseAs; 2752 CachedTokens Toks; 2753 2754 // Store the tokens of the parentheses. We will parse them after we determine 2755 // the context that follows them. 2756 if (!ConsumeAndStoreUntil(tok::r_paren, Toks)) { 2757 // We didn't find the ')' we expected. 2758 Tracker.consumeClose(); 2759 return ExprError(); 2760 } 2761 2762 if (Tok.is(tok::l_brace)) { 2763 ParseAs = CompoundLiteral; 2764 } else { 2765 bool NotCastExpr; 2766 // FIXME: Special-case ++ and --: "(S())++;" is not a cast-expression 2767 if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) { 2768 NotCastExpr = true; 2769 } else { 2770 // Try parsing the cast-expression that may follow. 2771 // If it is not a cast-expression, NotCastExpr will be true and no token 2772 // will be consumed. 2773 Result = ParseCastExpression(false/*isUnaryExpression*/, 2774 false/*isAddressofOperand*/, 2775 NotCastExpr, 2776 // type-id has priority. 2777 IsTypeCast); 2778 } 2779 2780 // If we parsed a cast-expression, it's really a type-id, otherwise it's 2781 // an expression. 2782 ParseAs = NotCastExpr ? SimpleExpr : CastExpr; 2783 } 2784 2785 // The current token should go after the cached tokens. 2786 Toks.push_back(Tok); 2787 // Re-enter the stored parenthesized tokens into the token stream, so we may 2788 // parse them now. 2789 PP.EnterTokenStream(Toks.data(), Toks.size(), 2790 true/*DisableMacroExpansion*/, false/*OwnsTokens*/); 2791 // Drop the current token and bring the first cached one. It's the same token 2792 // as when we entered this function. 2793 ConsumeAnyToken(); 2794 2795 if (ParseAs >= CompoundLiteral) { 2796 // Parse the type declarator. 2797 DeclSpec DS(AttrFactory); 2798 ParseSpecifierQualifierList(DS); 2799 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 2800 ParseDeclarator(DeclaratorInfo); 2801 2802 // Match the ')'. 2803 Tracker.consumeClose(); 2804 2805 if (ParseAs == CompoundLiteral) { 2806 ExprType = CompoundLiteral; 2807 TypeResult Ty = ParseTypeName(); 2808 return ParseCompoundLiteralExpression(Ty.get(), 2809 Tracker.getOpenLocation(), 2810 Tracker.getCloseLocation()); 2811 } 2812 2813 // We parsed '(' type-id ')' and the thing after it wasn't a '{'. 2814 assert(ParseAs == CastExpr); 2815 2816 if (DeclaratorInfo.isInvalidType()) 2817 return ExprError(); 2818 2819 // Result is what ParseCastExpression returned earlier. 2820 if (!Result.isInvalid()) 2821 Result = Actions.ActOnCastExpr(getCurScope(), Tracker.getOpenLocation(), 2822 DeclaratorInfo, CastTy, 2823 Tracker.getCloseLocation(), Result.take()); 2824 return move(Result); 2825 } 2826 2827 // Not a compound literal, and not followed by a cast-expression. 2828 assert(ParseAs == SimpleExpr); 2829 2830 ExprType = SimpleExpr; 2831 Result = ParseExpression(); 2832 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 2833 Result = Actions.ActOnParenExpr(Tracker.getOpenLocation(), 2834 Tok.getLocation(), Result.take()); 2835 2836 // Match the ')'. 2837 if (Result.isInvalid()) { 2838 SkipUntil(tok::r_paren); 2839 return ExprError(); 2840 } 2841 2842 Tracker.consumeClose(); 2843 return move(Result); 2844} 2845