ParseExprCXX.cpp revision b7e9589bce9852b4db9575f55ac9137572147eb5
1//===--- ParseExprCXX.cpp - C++ Expression Parsing ------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Expression parsing implementation for C++. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Parse/ParseDiagnostic.h" 15#include "clang/Parse/Parser.h" 16#include "RAIIObjectsForParser.h" 17#include "clang/Sema/DeclSpec.h" 18#include "clang/Sema/ParsedTemplate.h" 19#include "llvm/Support/ErrorHandling.h" 20 21using namespace clang; 22 23static int SelectDigraphErrorMessage(tok::TokenKind Kind) { 24 switch (Kind) { 25 case tok::kw_template: return 0; 26 case tok::kw_const_cast: return 1; 27 case tok::kw_dynamic_cast: return 2; 28 case tok::kw_reinterpret_cast: return 3; 29 case tok::kw_static_cast: return 4; 30 default: 31 assert(0 && "Unknown type for digraph error message."); 32 return -1; 33 } 34} 35 36// Are the two tokens adjacent in the same source file? 37static bool AreTokensAdjacent(Preprocessor &PP, Token &First, Token &Second) { 38 SourceManager &SM = PP.getSourceManager(); 39 SourceLocation FirstLoc = SM.getSpellingLoc(First.getLocation()); 40 SourceLocation FirstEnd = FirstLoc.getFileLocWithOffset(First.getLength()); 41 return FirstEnd == SM.getSpellingLoc(Second.getLocation()); 42} 43 44// Suggest fixit for "<::" after a cast. 45static void FixDigraph(Parser &P, Preprocessor &PP, Token &DigraphToken, 46 Token &ColonToken, tok::TokenKind Kind, bool AtDigraph) { 47 // Pull '<:' and ':' off token stream. 48 if (!AtDigraph) 49 PP.Lex(DigraphToken); 50 PP.Lex(ColonToken); 51 52 SourceRange Range; 53 Range.setBegin(DigraphToken.getLocation()); 54 Range.setEnd(ColonToken.getLocation()); 55 P.Diag(DigraphToken.getLocation(), diag::err_missing_whitespace_digraph) 56 << SelectDigraphErrorMessage(Kind) 57 << FixItHint::CreateReplacement(Range, "< ::"); 58 59 // Update token information to reflect their change in token type. 60 ColonToken.setKind(tok::coloncolon); 61 ColonToken.setLocation(ColonToken.getLocation().getFileLocWithOffset(-1)); 62 ColonToken.setLength(2); 63 DigraphToken.setKind(tok::less); 64 DigraphToken.setLength(1); 65 66 // Push new tokens back to token stream. 67 PP.EnterToken(ColonToken); 68 if (!AtDigraph) 69 PP.EnterToken(DigraphToken); 70} 71 72/// \brief Parse global scope or nested-name-specifier if present. 73/// 74/// Parses a C++ global scope specifier ('::') or nested-name-specifier (which 75/// may be preceded by '::'). Note that this routine will not parse ::new or 76/// ::delete; it will just leave them in the token stream. 77/// 78/// '::'[opt] nested-name-specifier 79/// '::' 80/// 81/// nested-name-specifier: 82/// type-name '::' 83/// namespace-name '::' 84/// nested-name-specifier identifier '::' 85/// nested-name-specifier 'template'[opt] simple-template-id '::' 86/// 87/// 88/// \param SS the scope specifier that will be set to the parsed 89/// nested-name-specifier (or empty) 90/// 91/// \param ObjectType if this nested-name-specifier is being parsed following 92/// the "." or "->" of a member access expression, this parameter provides the 93/// type of the object whose members are being accessed. 94/// 95/// \param EnteringContext whether we will be entering into the context of 96/// the nested-name-specifier after parsing it. 97/// 98/// \param MayBePseudoDestructor When non-NULL, points to a flag that 99/// indicates whether this nested-name-specifier may be part of a 100/// pseudo-destructor name. In this case, the flag will be set false 101/// if we don't actually end up parsing a destructor name. Moreorover, 102/// if we do end up determining that we are parsing a destructor name, 103/// the last component of the nested-name-specifier is not parsed as 104/// part of the scope specifier. 105 106/// member access expression, e.g., the \p T:: in \p p->T::m. 107/// 108/// \returns true if there was an error parsing a scope specifier 109bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS, 110 ParsedType ObjectType, 111 bool EnteringContext, 112 bool *MayBePseudoDestructor, 113 bool IsTypename) { 114 assert(getLang().CPlusPlus && 115 "Call sites of this function should be guarded by checking for C++"); 116 117 if (Tok.is(tok::annot_cxxscope)) { 118 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(), 119 Tok.getAnnotationRange(), 120 SS); 121 ConsumeToken(); 122 return false; 123 } 124 125 bool HasScopeSpecifier = false; 126 127 if (Tok.is(tok::coloncolon)) { 128 // ::new and ::delete aren't nested-name-specifiers. 129 tok::TokenKind NextKind = NextToken().getKind(); 130 if (NextKind == tok::kw_new || NextKind == tok::kw_delete) 131 return false; 132 133 // '::' - Global scope qualifier. 134 if (Actions.ActOnCXXGlobalScopeSpecifier(getCurScope(), ConsumeToken(), SS)) 135 return true; 136 137 HasScopeSpecifier = true; 138 } 139 140 bool CheckForDestructor = false; 141 if (MayBePseudoDestructor && *MayBePseudoDestructor) { 142 CheckForDestructor = true; 143 *MayBePseudoDestructor = false; 144 } 145 146 while (true) { 147 if (HasScopeSpecifier) { 148 // C++ [basic.lookup.classref]p5: 149 // If the qualified-id has the form 150 // 151 // ::class-name-or-namespace-name::... 152 // 153 // the class-name-or-namespace-name is looked up in global scope as a 154 // class-name or namespace-name. 155 // 156 // To implement this, we clear out the object type as soon as we've 157 // seen a leading '::' or part of a nested-name-specifier. 158 ObjectType = ParsedType(); 159 160 if (Tok.is(tok::code_completion)) { 161 // Code completion for a nested-name-specifier, where the code 162 // code completion token follows the '::'. 163 Actions.CodeCompleteQualifiedId(getCurScope(), SS, EnteringContext); 164 SourceLocation ccLoc = ConsumeCodeCompletionToken(); 165 // Include code completion token into the range of the scope otherwise 166 // when we try to annotate the scope tokens the dangling code completion 167 // token will cause assertion in 168 // Preprocessor::AnnotatePreviousCachedTokens. 169 SS.setEndLoc(ccLoc); 170 } 171 } 172 173 // nested-name-specifier: 174 // nested-name-specifier 'template'[opt] simple-template-id '::' 175 176 // Parse the optional 'template' keyword, then make sure we have 177 // 'identifier <' after it. 178 if (Tok.is(tok::kw_template)) { 179 // If we don't have a scope specifier or an object type, this isn't a 180 // nested-name-specifier, since they aren't allowed to start with 181 // 'template'. 182 if (!HasScopeSpecifier && !ObjectType) 183 break; 184 185 TentativeParsingAction TPA(*this); 186 SourceLocation TemplateKWLoc = ConsumeToken(); 187 188 UnqualifiedId TemplateName; 189 if (Tok.is(tok::identifier)) { 190 // Consume the identifier. 191 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 192 ConsumeToken(); 193 } else if (Tok.is(tok::kw_operator)) { 194 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, 195 TemplateName)) { 196 TPA.Commit(); 197 break; 198 } 199 200 if (TemplateName.getKind() != UnqualifiedId::IK_OperatorFunctionId && 201 TemplateName.getKind() != UnqualifiedId::IK_LiteralOperatorId) { 202 Diag(TemplateName.getSourceRange().getBegin(), 203 diag::err_id_after_template_in_nested_name_spec) 204 << TemplateName.getSourceRange(); 205 TPA.Commit(); 206 break; 207 } 208 } else { 209 TPA.Revert(); 210 break; 211 } 212 213 // If the next token is not '<', we have a qualified-id that refers 214 // to a template name, such as T::template apply, but is not a 215 // template-id. 216 if (Tok.isNot(tok::less)) { 217 TPA.Revert(); 218 break; 219 } 220 221 // Commit to parsing the template-id. 222 TPA.Commit(); 223 TemplateTy Template; 224 if (TemplateNameKind TNK = Actions.ActOnDependentTemplateName(getCurScope(), 225 TemplateKWLoc, 226 SS, 227 TemplateName, 228 ObjectType, 229 EnteringContext, 230 Template)) { 231 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 232 TemplateKWLoc, false)) 233 return true; 234 } else 235 return true; 236 237 continue; 238 } 239 240 if (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) { 241 // We have 242 // 243 // simple-template-id '::' 244 // 245 // So we need to check whether the simple-template-id is of the 246 // right kind (it should name a type or be dependent), and then 247 // convert it into a type within the nested-name-specifier. 248 TemplateIdAnnotation *TemplateId 249 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 250 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde)) { 251 *MayBePseudoDestructor = true; 252 return false; 253 } 254 255 // Consume the template-id token. 256 ConsumeToken(); 257 258 assert(Tok.is(tok::coloncolon) && "NextToken() not working properly!"); 259 SourceLocation CCLoc = ConsumeToken(); 260 261 if (!HasScopeSpecifier) 262 HasScopeSpecifier = true; 263 264 ASTTemplateArgsPtr TemplateArgsPtr(Actions, 265 TemplateId->getTemplateArgs(), 266 TemplateId->NumArgs); 267 268 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(), 269 /*FIXME:*/SourceLocation(), 270 SS, 271 TemplateId->Template, 272 TemplateId->TemplateNameLoc, 273 TemplateId->LAngleLoc, 274 TemplateArgsPtr, 275 TemplateId->RAngleLoc, 276 CCLoc, 277 EnteringContext)) { 278 SourceLocation StartLoc 279 = SS.getBeginLoc().isValid()? SS.getBeginLoc() 280 : TemplateId->TemplateNameLoc; 281 SS.SetInvalid(SourceRange(StartLoc, CCLoc)); 282 } 283 284 TemplateId->Destroy(); 285 continue; 286 } 287 288 289 // The rest of the nested-name-specifier possibilities start with 290 // tok::identifier. 291 if (Tok.isNot(tok::identifier)) 292 break; 293 294 IdentifierInfo &II = *Tok.getIdentifierInfo(); 295 296 // nested-name-specifier: 297 // type-name '::' 298 // namespace-name '::' 299 // nested-name-specifier identifier '::' 300 Token Next = NextToken(); 301 302 // If we get foo:bar, this is almost certainly a typo for foo::bar. Recover 303 // and emit a fixit hint for it. 304 if (Next.is(tok::colon) && !ColonIsSacred) { 305 if (Actions.IsInvalidUnlessNestedName(getCurScope(), SS, II, 306 Tok.getLocation(), 307 Next.getLocation(), ObjectType, 308 EnteringContext) && 309 // If the token after the colon isn't an identifier, it's still an 310 // error, but they probably meant something else strange so don't 311 // recover like this. 312 PP.LookAhead(1).is(tok::identifier)) { 313 Diag(Next, diag::err_unexected_colon_in_nested_name_spec) 314 << FixItHint::CreateReplacement(Next.getLocation(), "::"); 315 316 // Recover as if the user wrote '::'. 317 Next.setKind(tok::coloncolon); 318 } 319 } 320 321 if (Next.is(tok::coloncolon)) { 322 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde) && 323 !Actions.isNonTypeNestedNameSpecifier(getCurScope(), SS, Tok.getLocation(), 324 II, ObjectType)) { 325 *MayBePseudoDestructor = true; 326 return false; 327 } 328 329 // We have an identifier followed by a '::'. Lookup this name 330 // as the name in a nested-name-specifier. 331 SourceLocation IdLoc = ConsumeToken(); 332 assert((Tok.is(tok::coloncolon) || Tok.is(tok::colon)) && 333 "NextToken() not working properly!"); 334 SourceLocation CCLoc = ConsumeToken(); 335 336 HasScopeSpecifier = true; 337 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(), II, IdLoc, CCLoc, 338 ObjectType, EnteringContext, SS)) 339 SS.SetInvalid(SourceRange(IdLoc, CCLoc)); 340 341 continue; 342 } 343 344 // Check for '<::' which should be '< ::' instead of '[:' when following 345 // a template name. 346 if (Next.is(tok::l_square) && Next.getLength() == 2) { 347 Token SecondToken = GetLookAheadToken(2); 348 if (SecondToken.is(tok::colon) && 349 AreTokensAdjacent(PP, Next, SecondToken)) { 350 TemplateTy Template; 351 UnqualifiedId TemplateName; 352 TemplateName.setIdentifier(&II, Tok.getLocation()); 353 bool MemberOfUnknownSpecialization; 354 if (Actions.isTemplateName(getCurScope(), SS, 355 /*hasTemplateKeyword=*/false, 356 TemplateName, 357 ObjectType, 358 EnteringContext, 359 Template, 360 MemberOfUnknownSpecialization)) { 361 FixDigraph(*this, PP, Next, SecondToken, tok::kw_template, 362 /*AtDigraph*/false); 363 } 364 } 365 } 366 367 // nested-name-specifier: 368 // type-name '<' 369 if (Next.is(tok::less)) { 370 TemplateTy Template; 371 UnqualifiedId TemplateName; 372 TemplateName.setIdentifier(&II, Tok.getLocation()); 373 bool MemberOfUnknownSpecialization; 374 if (TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS, 375 /*hasTemplateKeyword=*/false, 376 TemplateName, 377 ObjectType, 378 EnteringContext, 379 Template, 380 MemberOfUnknownSpecialization)) { 381 // We have found a template name, so annotate this this token 382 // with a template-id annotation. We do not permit the 383 // template-id to be translated into a type annotation, 384 // because some clients (e.g., the parsing of class template 385 // specializations) still want to see the original template-id 386 // token. 387 ConsumeToken(); 388 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 389 SourceLocation(), false)) 390 return true; 391 continue; 392 } 393 394 if (MemberOfUnknownSpecialization && (ObjectType || SS.isSet()) && 395 (IsTypename || IsTemplateArgumentList(1))) { 396 // We have something like t::getAs<T>, where getAs is a 397 // member of an unknown specialization. However, this will only 398 // parse correctly as a template, so suggest the keyword 'template' 399 // before 'getAs' and treat this as a dependent template name. 400 unsigned DiagID = diag::err_missing_dependent_template_keyword; 401 if (getLang().Microsoft) 402 DiagID = diag::warn_missing_dependent_template_keyword; 403 404 Diag(Tok.getLocation(), DiagID) 405 << II.getName() 406 << FixItHint::CreateInsertion(Tok.getLocation(), "template "); 407 408 if (TemplateNameKind TNK 409 = Actions.ActOnDependentTemplateName(getCurScope(), 410 Tok.getLocation(), SS, 411 TemplateName, ObjectType, 412 EnteringContext, Template)) { 413 // Consume the identifier. 414 ConsumeToken(); 415 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName, 416 SourceLocation(), false)) 417 return true; 418 } 419 else 420 return true; 421 422 continue; 423 } 424 } 425 426 // We don't have any tokens that form the beginning of a 427 // nested-name-specifier, so we're done. 428 break; 429 } 430 431 // Even if we didn't see any pieces of a nested-name-specifier, we 432 // still check whether there is a tilde in this position, which 433 // indicates a potential pseudo-destructor. 434 if (CheckForDestructor && Tok.is(tok::tilde)) 435 *MayBePseudoDestructor = true; 436 437 return false; 438} 439 440/// ParseCXXIdExpression - Handle id-expression. 441/// 442/// id-expression: 443/// unqualified-id 444/// qualified-id 445/// 446/// qualified-id: 447/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 448/// '::' identifier 449/// '::' operator-function-id 450/// '::' template-id 451/// 452/// NOTE: The standard specifies that, for qualified-id, the parser does not 453/// expect: 454/// 455/// '::' conversion-function-id 456/// '::' '~' class-name 457/// 458/// This may cause a slight inconsistency on diagnostics: 459/// 460/// class C {}; 461/// namespace A {} 462/// void f() { 463/// :: A :: ~ C(); // Some Sema error about using destructor with a 464/// // namespace. 465/// :: ~ C(); // Some Parser error like 'unexpected ~'. 466/// } 467/// 468/// We simplify the parser a bit and make it work like: 469/// 470/// qualified-id: 471/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 472/// '::' unqualified-id 473/// 474/// That way Sema can handle and report similar errors for namespaces and the 475/// global scope. 476/// 477/// The isAddressOfOperand parameter indicates that this id-expression is a 478/// direct operand of the address-of operator. This is, besides member contexts, 479/// the only place where a qualified-id naming a non-static class member may 480/// appear. 481/// 482ExprResult Parser::ParseCXXIdExpression(bool isAddressOfOperand) { 483 // qualified-id: 484 // '::'[opt] nested-name-specifier 'template'[opt] unqualified-id 485 // '::' unqualified-id 486 // 487 CXXScopeSpec SS; 488 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 489 490 UnqualifiedId Name; 491 if (ParseUnqualifiedId(SS, 492 /*EnteringContext=*/false, 493 /*AllowDestructorName=*/false, 494 /*AllowConstructorName=*/false, 495 /*ObjectType=*/ ParsedType(), 496 Name)) 497 return ExprError(); 498 499 // This is only the direct operand of an & operator if it is not 500 // followed by a postfix-expression suffix. 501 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 502 isAddressOfOperand = false; 503 504 return Actions.ActOnIdExpression(getCurScope(), SS, Name, Tok.is(tok::l_paren), 505 isAddressOfOperand); 506 507} 508 509/// ParseCXXCasts - This handles the various ways to cast expressions to another 510/// type. 511/// 512/// postfix-expression: [C++ 5.2p1] 513/// 'dynamic_cast' '<' type-name '>' '(' expression ')' 514/// 'static_cast' '<' type-name '>' '(' expression ')' 515/// 'reinterpret_cast' '<' type-name '>' '(' expression ')' 516/// 'const_cast' '<' type-name '>' '(' expression ')' 517/// 518ExprResult Parser::ParseCXXCasts() { 519 tok::TokenKind Kind = Tok.getKind(); 520 const char *CastName = 0; // For error messages 521 522 switch (Kind) { 523 default: assert(0 && "Unknown C++ cast!"); abort(); 524 case tok::kw_const_cast: CastName = "const_cast"; break; 525 case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break; 526 case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break; 527 case tok::kw_static_cast: CastName = "static_cast"; break; 528 } 529 530 SourceLocation OpLoc = ConsumeToken(); 531 SourceLocation LAngleBracketLoc = Tok.getLocation(); 532 533 // Check for "<::" which is parsed as "[:". If found, fix token stream, 534 // diagnose error, suggest fix, and recover parsing. 535 Token Next = NextToken(); 536 if (Tok.is(tok::l_square) && Tok.getLength() == 2 && Next.is(tok::colon) && 537 AreTokensAdjacent(PP, Tok, Next)) 538 FixDigraph(*this, PP, Tok, Next, Kind, /*AtDigraph*/true); 539 540 if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName)) 541 return ExprError(); 542 543 TypeResult CastTy = ParseTypeName(); 544 SourceLocation RAngleBracketLoc = Tok.getLocation(); 545 546 if (ExpectAndConsume(tok::greater, diag::err_expected_greater)) 547 return ExprError(Diag(LAngleBracketLoc, diag::note_matching) << "<"); 548 549 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; 550 551 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, CastName)) 552 return ExprError(); 553 554 ExprResult Result = ParseExpression(); 555 556 // Match the ')'. 557 RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 558 559 if (!Result.isInvalid() && !CastTy.isInvalid()) 560 Result = Actions.ActOnCXXNamedCast(OpLoc, Kind, 561 LAngleBracketLoc, CastTy.get(), 562 RAngleBracketLoc, 563 LParenLoc, Result.take(), RParenLoc); 564 565 return move(Result); 566} 567 568/// ParseCXXTypeid - This handles the C++ typeid expression. 569/// 570/// postfix-expression: [C++ 5.2p1] 571/// 'typeid' '(' expression ')' 572/// 'typeid' '(' type-id ')' 573/// 574ExprResult Parser::ParseCXXTypeid() { 575 assert(Tok.is(tok::kw_typeid) && "Not 'typeid'!"); 576 577 SourceLocation OpLoc = ConsumeToken(); 578 SourceLocation LParenLoc = Tok.getLocation(); 579 SourceLocation RParenLoc; 580 581 // typeid expressions are always parenthesized. 582 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 583 "typeid")) 584 return ExprError(); 585 586 ExprResult Result; 587 588 if (isTypeIdInParens()) { 589 TypeResult Ty = ParseTypeName(); 590 591 // Match the ')'. 592 RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 593 594 if (Ty.isInvalid() || RParenLoc.isInvalid()) 595 return ExprError(); 596 597 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/true, 598 Ty.get().getAsOpaquePtr(), RParenLoc); 599 } else { 600 // C++0x [expr.typeid]p3: 601 // When typeid is applied to an expression other than an lvalue of a 602 // polymorphic class type [...] The expression is an unevaluated 603 // operand (Clause 5). 604 // 605 // Note that we can't tell whether the expression is an lvalue of a 606 // polymorphic class type until after we've parsed the expression, so 607 // we the expression is potentially potentially evaluated. 608 EnterExpressionEvaluationContext Unevaluated(Actions, 609 Sema::PotentiallyPotentiallyEvaluated); 610 Result = ParseExpression(); 611 612 // Match the ')'. 613 if (Result.isInvalid()) 614 SkipUntil(tok::r_paren); 615 else { 616 RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 617 if (RParenLoc.isInvalid()) 618 return ExprError(); 619 620 // If we are a foo<int> that identifies a single function, resolve it now... 621 Expr* e = Result.get(); 622 if (e->getType() == Actions.Context.OverloadTy) { 623 ExprResult er = 624 Actions.ResolveAndFixSingleFunctionTemplateSpecialization(e); 625 if (er.isUsable()) 626 Result = er.release(); 627 } 628 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/false, 629 Result.release(), RParenLoc); 630 } 631 } 632 633 return move(Result); 634} 635 636/// ParseCXXUuidof - This handles the Microsoft C++ __uuidof expression. 637/// 638/// '__uuidof' '(' expression ')' 639/// '__uuidof' '(' type-id ')' 640/// 641ExprResult Parser::ParseCXXUuidof() { 642 assert(Tok.is(tok::kw___uuidof) && "Not '__uuidof'!"); 643 644 SourceLocation OpLoc = ConsumeToken(); 645 SourceLocation LParenLoc = Tok.getLocation(); 646 SourceLocation RParenLoc; 647 648 // __uuidof expressions are always parenthesized. 649 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, 650 "__uuidof")) 651 return ExprError(); 652 653 ExprResult Result; 654 655 if (isTypeIdInParens()) { 656 TypeResult Ty = ParseTypeName(); 657 658 // Match the ')'. 659 RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 660 661 if (Ty.isInvalid()) 662 return ExprError(); 663 664 Result = Actions.ActOnCXXUuidof(OpLoc, LParenLoc, /*isType=*/true, 665 Ty.get().getAsOpaquePtr(), RParenLoc); 666 } else { 667 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 668 Result = ParseExpression(); 669 670 // Match the ')'. 671 if (Result.isInvalid()) 672 SkipUntil(tok::r_paren); 673 else { 674 RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 675 676 Result = Actions.ActOnCXXUuidof(OpLoc, LParenLoc, /*isType=*/false, 677 Result.release(), RParenLoc); 678 } 679 } 680 681 return move(Result); 682} 683 684/// \brief Parse a C++ pseudo-destructor expression after the base, 685/// . or -> operator, and nested-name-specifier have already been 686/// parsed. 687/// 688/// postfix-expression: [C++ 5.2] 689/// postfix-expression . pseudo-destructor-name 690/// postfix-expression -> pseudo-destructor-name 691/// 692/// pseudo-destructor-name: 693/// ::[opt] nested-name-specifier[opt] type-name :: ~type-name 694/// ::[opt] nested-name-specifier template simple-template-id :: 695/// ~type-name 696/// ::[opt] nested-name-specifier[opt] ~type-name 697/// 698ExprResult 699Parser::ParseCXXPseudoDestructor(ExprArg Base, SourceLocation OpLoc, 700 tok::TokenKind OpKind, 701 CXXScopeSpec &SS, 702 ParsedType ObjectType) { 703 // We're parsing either a pseudo-destructor-name or a dependent 704 // member access that has the same form as a 705 // pseudo-destructor-name. We parse both in the same way and let 706 // the action model sort them out. 707 // 708 // Note that the ::[opt] nested-name-specifier[opt] has already 709 // been parsed, and if there was a simple-template-id, it has 710 // been coalesced into a template-id annotation token. 711 UnqualifiedId FirstTypeName; 712 SourceLocation CCLoc; 713 if (Tok.is(tok::identifier)) { 714 FirstTypeName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 715 ConsumeToken(); 716 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail"); 717 CCLoc = ConsumeToken(); 718 } else if (Tok.is(tok::annot_template_id)) { 719 FirstTypeName.setTemplateId( 720 (TemplateIdAnnotation *)Tok.getAnnotationValue()); 721 ConsumeToken(); 722 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail"); 723 CCLoc = ConsumeToken(); 724 } else { 725 FirstTypeName.setIdentifier(0, SourceLocation()); 726 } 727 728 // Parse the tilde. 729 assert(Tok.is(tok::tilde) && "ParseOptionalCXXScopeSpecifier fail"); 730 SourceLocation TildeLoc = ConsumeToken(); 731 if (!Tok.is(tok::identifier)) { 732 Diag(Tok, diag::err_destructor_tilde_identifier); 733 return ExprError(); 734 } 735 736 // Parse the second type. 737 UnqualifiedId SecondTypeName; 738 IdentifierInfo *Name = Tok.getIdentifierInfo(); 739 SourceLocation NameLoc = ConsumeToken(); 740 SecondTypeName.setIdentifier(Name, NameLoc); 741 742 // If there is a '<', the second type name is a template-id. Parse 743 // it as such. 744 if (Tok.is(tok::less) && 745 ParseUnqualifiedIdTemplateId(SS, Name, NameLoc, false, ObjectType, 746 SecondTypeName, /*AssumeTemplateName=*/true, 747 /*TemplateKWLoc*/SourceLocation())) 748 return ExprError(); 749 750 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, 751 OpLoc, OpKind, 752 SS, FirstTypeName, CCLoc, 753 TildeLoc, SecondTypeName, 754 Tok.is(tok::l_paren)); 755} 756 757/// ParseCXXBoolLiteral - This handles the C++ Boolean literals. 758/// 759/// boolean-literal: [C++ 2.13.5] 760/// 'true' 761/// 'false' 762ExprResult Parser::ParseCXXBoolLiteral() { 763 tok::TokenKind Kind = Tok.getKind(); 764 return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind); 765} 766 767/// ParseThrowExpression - This handles the C++ throw expression. 768/// 769/// throw-expression: [C++ 15] 770/// 'throw' assignment-expression[opt] 771ExprResult Parser::ParseThrowExpression() { 772 assert(Tok.is(tok::kw_throw) && "Not throw!"); 773 SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token. 774 775 // If the current token isn't the start of an assignment-expression, 776 // then the expression is not present. This handles things like: 777 // "C ? throw : (void)42", which is crazy but legal. 778 switch (Tok.getKind()) { // FIXME: move this predicate somewhere common. 779 case tok::semi: 780 case tok::r_paren: 781 case tok::r_square: 782 case tok::r_brace: 783 case tok::colon: 784 case tok::comma: 785 return Actions.ActOnCXXThrow(ThrowLoc, 0); 786 787 default: 788 ExprResult Expr(ParseAssignmentExpression()); 789 if (Expr.isInvalid()) return move(Expr); 790 return Actions.ActOnCXXThrow(ThrowLoc, Expr.take()); 791 } 792} 793 794/// ParseCXXThis - This handles the C++ 'this' pointer. 795/// 796/// C++ 9.3.2: In the body of a non-static member function, the keyword this is 797/// a non-lvalue expression whose value is the address of the object for which 798/// the function is called. 799ExprResult Parser::ParseCXXThis() { 800 assert(Tok.is(tok::kw_this) && "Not 'this'!"); 801 SourceLocation ThisLoc = ConsumeToken(); 802 return Actions.ActOnCXXThis(ThisLoc); 803} 804 805/// ParseCXXTypeConstructExpression - Parse construction of a specified type. 806/// Can be interpreted either as function-style casting ("int(x)") 807/// or class type construction ("ClassType(x,y,z)") 808/// or creation of a value-initialized type ("int()"). 809/// 810/// postfix-expression: [C++ 5.2p1] 811/// simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 812/// typename-specifier '(' expression-list[opt] ')' [TODO] 813/// 814ExprResult 815Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) { 816 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 817 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo).get(); 818 819 assert(Tok.is(tok::l_paren) && "Expected '('!"); 820 GreaterThanIsOperatorScope G(GreaterThanIsOperator, true); 821 822 SourceLocation LParenLoc = ConsumeParen(); 823 824 ExprVector Exprs(Actions); 825 CommaLocsTy CommaLocs; 826 827 if (Tok.isNot(tok::r_paren)) { 828 if (ParseExpressionList(Exprs, CommaLocs)) { 829 SkipUntil(tok::r_paren); 830 return ExprError(); 831 } 832 } 833 834 // Match the ')'. 835 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 836 837 // TypeRep could be null, if it references an invalid typedef. 838 if (!TypeRep) 839 return ExprError(); 840 841 assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&& 842 "Unexpected number of commas!"); 843 return Actions.ActOnCXXTypeConstructExpr(TypeRep, LParenLoc, move_arg(Exprs), 844 RParenLoc); 845} 846 847/// ParseCXXCondition - if/switch/while condition expression. 848/// 849/// condition: 850/// expression 851/// type-specifier-seq declarator '=' assignment-expression 852/// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt] 853/// '=' assignment-expression 854/// 855/// \param ExprResult if the condition was parsed as an expression, the 856/// parsed expression. 857/// 858/// \param DeclResult if the condition was parsed as a declaration, the 859/// parsed declaration. 860/// 861/// \param Loc The location of the start of the statement that requires this 862/// condition, e.g., the "for" in a for loop. 863/// 864/// \param ConvertToBoolean Whether the condition expression should be 865/// converted to a boolean value. 866/// 867/// \returns true if there was a parsing, false otherwise. 868bool Parser::ParseCXXCondition(ExprResult &ExprOut, 869 Decl *&DeclOut, 870 SourceLocation Loc, 871 bool ConvertToBoolean) { 872 if (Tok.is(tok::code_completion)) { 873 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Condition); 874 ConsumeCodeCompletionToken(); 875 } 876 877 if (!isCXXConditionDeclaration()) { 878 // Parse the expression. 879 ExprOut = ParseExpression(); // expression 880 DeclOut = 0; 881 if (ExprOut.isInvalid()) 882 return true; 883 884 // If required, convert to a boolean value. 885 if (ConvertToBoolean) 886 ExprOut 887 = Actions.ActOnBooleanCondition(getCurScope(), Loc, ExprOut.get()); 888 return ExprOut.isInvalid(); 889 } 890 891 // type-specifier-seq 892 DeclSpec DS(AttrFactory); 893 ParseSpecifierQualifierList(DS); 894 895 // declarator 896 Declarator DeclaratorInfo(DS, Declarator::ConditionContext); 897 ParseDeclarator(DeclaratorInfo); 898 899 // simple-asm-expr[opt] 900 if (Tok.is(tok::kw_asm)) { 901 SourceLocation Loc; 902 ExprResult AsmLabel(ParseSimpleAsm(&Loc)); 903 if (AsmLabel.isInvalid()) { 904 SkipUntil(tok::semi); 905 return true; 906 } 907 DeclaratorInfo.setAsmLabel(AsmLabel.release()); 908 DeclaratorInfo.SetRangeEnd(Loc); 909 } 910 911 // If attributes are present, parse them. 912 MaybeParseGNUAttributes(DeclaratorInfo); 913 914 // Type-check the declaration itself. 915 DeclResult Dcl = Actions.ActOnCXXConditionDeclaration(getCurScope(), 916 DeclaratorInfo); 917 DeclOut = Dcl.get(); 918 ExprOut = ExprError(); 919 920 // '=' assignment-expression 921 if (isTokenEqualOrMistypedEqualEqual( 922 diag::err_invalid_equalequal_after_declarator)) { 923 ConsumeToken(); 924 ExprResult AssignExpr(ParseAssignmentExpression()); 925 if (!AssignExpr.isInvalid()) 926 Actions.AddInitializerToDecl(DeclOut, AssignExpr.take(), false, 927 DS.getTypeSpecType() == DeclSpec::TST_auto); 928 } else { 929 // FIXME: C++0x allows a braced-init-list 930 Diag(Tok, diag::err_expected_equal_after_declarator); 931 } 932 933 // FIXME: Build a reference to this declaration? Convert it to bool? 934 // (This is currently handled by Sema). 935 936 Actions.FinalizeDeclaration(DeclOut); 937 938 return false; 939} 940 941/// \brief Determine whether the current token starts a C++ 942/// simple-type-specifier. 943bool Parser::isCXXSimpleTypeSpecifier() const { 944 switch (Tok.getKind()) { 945 case tok::annot_typename: 946 case tok::kw_short: 947 case tok::kw_long: 948 case tok::kw_signed: 949 case tok::kw_unsigned: 950 case tok::kw_void: 951 case tok::kw_char: 952 case tok::kw_int: 953 case tok::kw_float: 954 case tok::kw_double: 955 case tok::kw_wchar_t: 956 case tok::kw_char16_t: 957 case tok::kw_char32_t: 958 case tok::kw_bool: 959 // FIXME: C++0x decltype support. 960 // GNU typeof support. 961 case tok::kw_typeof: 962 return true; 963 964 default: 965 break; 966 } 967 968 return false; 969} 970 971/// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers. 972/// This should only be called when the current token is known to be part of 973/// simple-type-specifier. 974/// 975/// simple-type-specifier: 976/// '::'[opt] nested-name-specifier[opt] type-name 977/// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO] 978/// char 979/// wchar_t 980/// bool 981/// short 982/// int 983/// long 984/// signed 985/// unsigned 986/// float 987/// double 988/// void 989/// [GNU] typeof-specifier 990/// [C++0x] auto [TODO] 991/// 992/// type-name: 993/// class-name 994/// enum-name 995/// typedef-name 996/// 997void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) { 998 DS.SetRangeStart(Tok.getLocation()); 999 const char *PrevSpec; 1000 unsigned DiagID; 1001 SourceLocation Loc = Tok.getLocation(); 1002 1003 switch (Tok.getKind()) { 1004 case tok::identifier: // foo::bar 1005 case tok::coloncolon: // ::foo::bar 1006 assert(0 && "Annotation token should already be formed!"); 1007 default: 1008 assert(0 && "Not a simple-type-specifier token!"); 1009 abort(); 1010 1011 // type-name 1012 case tok::annot_typename: { 1013 if (getTypeAnnotation(Tok)) 1014 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, 1015 getTypeAnnotation(Tok)); 1016 else 1017 DS.SetTypeSpecError(); 1018 1019 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 1020 ConsumeToken(); 1021 1022 // Objective-C supports syntax of the form 'id<proto1,proto2>' where 'id' 1023 // is a specific typedef and 'itf<proto1,proto2>' where 'itf' is an 1024 // Objective-C interface. If we don't have Objective-C or a '<', this is 1025 // just a normal reference to a typedef name. 1026 if (Tok.is(tok::less) && getLang().ObjC1) 1027 ParseObjCProtocolQualifiers(DS); 1028 1029 DS.Finish(Diags, PP); 1030 return; 1031 } 1032 1033 // builtin types 1034 case tok::kw_short: 1035 DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID); 1036 break; 1037 case tok::kw_long: 1038 DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, DiagID); 1039 break; 1040 case tok::kw_signed: 1041 DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID); 1042 break; 1043 case tok::kw_unsigned: 1044 DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, DiagID); 1045 break; 1046 case tok::kw_void: 1047 DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID); 1048 break; 1049 case tok::kw_char: 1050 DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID); 1051 break; 1052 case tok::kw_int: 1053 DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID); 1054 break; 1055 case tok::kw_float: 1056 DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID); 1057 break; 1058 case tok::kw_double: 1059 DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID); 1060 break; 1061 case tok::kw_wchar_t: 1062 DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID); 1063 break; 1064 case tok::kw_char16_t: 1065 DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID); 1066 break; 1067 case tok::kw_char32_t: 1068 DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID); 1069 break; 1070 case tok::kw_bool: 1071 DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID); 1072 break; 1073 1074 // FIXME: C++0x decltype support. 1075 // GNU typeof support. 1076 case tok::kw_typeof: 1077 ParseTypeofSpecifier(DS); 1078 DS.Finish(Diags, PP); 1079 return; 1080 } 1081 if (Tok.is(tok::annot_typename)) 1082 DS.SetRangeEnd(Tok.getAnnotationEndLoc()); 1083 else 1084 DS.SetRangeEnd(Tok.getLocation()); 1085 ConsumeToken(); 1086 DS.Finish(Diags, PP); 1087} 1088 1089/// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++ 1090/// [dcl.name]), which is a non-empty sequence of type-specifiers, 1091/// e.g., "const short int". Note that the DeclSpec is *not* finished 1092/// by parsing the type-specifier-seq, because these sequences are 1093/// typically followed by some form of declarator. Returns true and 1094/// emits diagnostics if this is not a type-specifier-seq, false 1095/// otherwise. 1096/// 1097/// type-specifier-seq: [C++ 8.1] 1098/// type-specifier type-specifier-seq[opt] 1099/// 1100bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) { 1101 DS.SetRangeStart(Tok.getLocation()); 1102 const char *PrevSpec = 0; 1103 unsigned DiagID; 1104 bool isInvalid = 0; 1105 1106 // Parse one or more of the type specifiers. 1107 if (!ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec, DiagID, 1108 ParsedTemplateInfo(), /*SuppressDeclarations*/true)) { 1109 Diag(Tok, diag::err_expected_type); 1110 return true; 1111 } 1112 1113 while (ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec, DiagID, 1114 ParsedTemplateInfo(), /*SuppressDeclarations*/true)) 1115 {} 1116 1117 DS.Finish(Diags, PP); 1118 return false; 1119} 1120 1121/// \brief Finish parsing a C++ unqualified-id that is a template-id of 1122/// some form. 1123/// 1124/// This routine is invoked when a '<' is encountered after an identifier or 1125/// operator-function-id is parsed by \c ParseUnqualifiedId() to determine 1126/// whether the unqualified-id is actually a template-id. This routine will 1127/// then parse the template arguments and form the appropriate template-id to 1128/// return to the caller. 1129/// 1130/// \param SS the nested-name-specifier that precedes this template-id, if 1131/// we're actually parsing a qualified-id. 1132/// 1133/// \param Name for constructor and destructor names, this is the actual 1134/// identifier that may be a template-name. 1135/// 1136/// \param NameLoc the location of the class-name in a constructor or 1137/// destructor. 1138/// 1139/// \param EnteringContext whether we're entering the scope of the 1140/// nested-name-specifier. 1141/// 1142/// \param ObjectType if this unqualified-id occurs within a member access 1143/// expression, the type of the base object whose member is being accessed. 1144/// 1145/// \param Id as input, describes the template-name or operator-function-id 1146/// that precedes the '<'. If template arguments were parsed successfully, 1147/// will be updated with the template-id. 1148/// 1149/// \param AssumeTemplateId When true, this routine will assume that the name 1150/// refers to a template without performing name lookup to verify. 1151/// 1152/// \returns true if a parse error occurred, false otherwise. 1153bool Parser::ParseUnqualifiedIdTemplateId(CXXScopeSpec &SS, 1154 IdentifierInfo *Name, 1155 SourceLocation NameLoc, 1156 bool EnteringContext, 1157 ParsedType ObjectType, 1158 UnqualifiedId &Id, 1159 bool AssumeTemplateId, 1160 SourceLocation TemplateKWLoc) { 1161 assert((AssumeTemplateId || Tok.is(tok::less)) && 1162 "Expected '<' to finish parsing a template-id"); 1163 1164 TemplateTy Template; 1165 TemplateNameKind TNK = TNK_Non_template; 1166 switch (Id.getKind()) { 1167 case UnqualifiedId::IK_Identifier: 1168 case UnqualifiedId::IK_OperatorFunctionId: 1169 case UnqualifiedId::IK_LiteralOperatorId: 1170 if (AssumeTemplateId) { 1171 TNK = Actions.ActOnDependentTemplateName(getCurScope(), TemplateKWLoc, SS, 1172 Id, ObjectType, EnteringContext, 1173 Template); 1174 if (TNK == TNK_Non_template) 1175 return true; 1176 } else { 1177 bool MemberOfUnknownSpecialization; 1178 TNK = Actions.isTemplateName(getCurScope(), SS, 1179 TemplateKWLoc.isValid(), Id, 1180 ObjectType, EnteringContext, Template, 1181 MemberOfUnknownSpecialization); 1182 1183 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization && 1184 ObjectType && IsTemplateArgumentList()) { 1185 // We have something like t->getAs<T>(), where getAs is a 1186 // member of an unknown specialization. However, this will only 1187 // parse correctly as a template, so suggest the keyword 'template' 1188 // before 'getAs' and treat this as a dependent template name. 1189 std::string Name; 1190 if (Id.getKind() == UnqualifiedId::IK_Identifier) 1191 Name = Id.Identifier->getName(); 1192 else { 1193 Name = "operator "; 1194 if (Id.getKind() == UnqualifiedId::IK_OperatorFunctionId) 1195 Name += getOperatorSpelling(Id.OperatorFunctionId.Operator); 1196 else 1197 Name += Id.Identifier->getName(); 1198 } 1199 Diag(Id.StartLocation, diag::err_missing_dependent_template_keyword) 1200 << Name 1201 << FixItHint::CreateInsertion(Id.StartLocation, "template "); 1202 TNK = Actions.ActOnDependentTemplateName(getCurScope(), TemplateKWLoc, 1203 SS, Id, ObjectType, 1204 EnteringContext, Template); 1205 if (TNK == TNK_Non_template) 1206 return true; 1207 } 1208 } 1209 break; 1210 1211 case UnqualifiedId::IK_ConstructorName: { 1212 UnqualifiedId TemplateName; 1213 bool MemberOfUnknownSpecialization; 1214 TemplateName.setIdentifier(Name, NameLoc); 1215 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(), 1216 TemplateName, ObjectType, 1217 EnteringContext, Template, 1218 MemberOfUnknownSpecialization); 1219 break; 1220 } 1221 1222 case UnqualifiedId::IK_DestructorName: { 1223 UnqualifiedId TemplateName; 1224 bool MemberOfUnknownSpecialization; 1225 TemplateName.setIdentifier(Name, NameLoc); 1226 if (ObjectType) { 1227 TNK = Actions.ActOnDependentTemplateName(getCurScope(), TemplateKWLoc, SS, 1228 TemplateName, ObjectType, 1229 EnteringContext, Template); 1230 if (TNK == TNK_Non_template) 1231 return true; 1232 } else { 1233 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(), 1234 TemplateName, ObjectType, 1235 EnteringContext, Template, 1236 MemberOfUnknownSpecialization); 1237 1238 if (TNK == TNK_Non_template && !Id.DestructorName.get()) { 1239 Diag(NameLoc, diag::err_destructor_template_id) 1240 << Name << SS.getRange(); 1241 return true; 1242 } 1243 } 1244 break; 1245 } 1246 1247 default: 1248 return false; 1249 } 1250 1251 if (TNK == TNK_Non_template) 1252 return false; 1253 1254 // Parse the enclosed template argument list. 1255 SourceLocation LAngleLoc, RAngleLoc; 1256 TemplateArgList TemplateArgs; 1257 if (Tok.is(tok::less) && 1258 ParseTemplateIdAfterTemplateName(Template, Id.StartLocation, 1259 SS, true, LAngleLoc, 1260 TemplateArgs, 1261 RAngleLoc)) 1262 return true; 1263 1264 if (Id.getKind() == UnqualifiedId::IK_Identifier || 1265 Id.getKind() == UnqualifiedId::IK_OperatorFunctionId || 1266 Id.getKind() == UnqualifiedId::IK_LiteralOperatorId) { 1267 // Form a parsed representation of the template-id to be stored in the 1268 // UnqualifiedId. 1269 TemplateIdAnnotation *TemplateId 1270 = TemplateIdAnnotation::Allocate(TemplateArgs.size()); 1271 1272 if (Id.getKind() == UnqualifiedId::IK_Identifier) { 1273 TemplateId->Name = Id.Identifier; 1274 TemplateId->Operator = OO_None; 1275 TemplateId->TemplateNameLoc = Id.StartLocation; 1276 } else { 1277 TemplateId->Name = 0; 1278 TemplateId->Operator = Id.OperatorFunctionId.Operator; 1279 TemplateId->TemplateNameLoc = Id.StartLocation; 1280 } 1281 1282 TemplateId->SS = SS; 1283 TemplateId->Template = Template; 1284 TemplateId->Kind = TNK; 1285 TemplateId->LAngleLoc = LAngleLoc; 1286 TemplateId->RAngleLoc = RAngleLoc; 1287 ParsedTemplateArgument *Args = TemplateId->getTemplateArgs(); 1288 for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); 1289 Arg != ArgEnd; ++Arg) 1290 Args[Arg] = TemplateArgs[Arg]; 1291 1292 Id.setTemplateId(TemplateId); 1293 return false; 1294 } 1295 1296 // Bundle the template arguments together. 1297 ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(), 1298 TemplateArgs.size()); 1299 1300 // Constructor and destructor names. 1301 TypeResult Type 1302 = Actions.ActOnTemplateIdType(SS, Template, NameLoc, 1303 LAngleLoc, TemplateArgsPtr, 1304 RAngleLoc); 1305 if (Type.isInvalid()) 1306 return true; 1307 1308 if (Id.getKind() == UnqualifiedId::IK_ConstructorName) 1309 Id.setConstructorName(Type.get(), NameLoc, RAngleLoc); 1310 else 1311 Id.setDestructorName(Id.StartLocation, Type.get(), RAngleLoc); 1312 1313 return false; 1314} 1315 1316/// \brief Parse an operator-function-id or conversion-function-id as part 1317/// of a C++ unqualified-id. 1318/// 1319/// This routine is responsible only for parsing the operator-function-id or 1320/// conversion-function-id; it does not handle template arguments in any way. 1321/// 1322/// \code 1323/// operator-function-id: [C++ 13.5] 1324/// 'operator' operator 1325/// 1326/// operator: one of 1327/// new delete new[] delete[] 1328/// + - * / % ^ & | ~ 1329/// ! = < > += -= *= /= %= 1330/// ^= &= |= << >> >>= <<= == != 1331/// <= >= && || ++ -- , ->* -> 1332/// () [] 1333/// 1334/// conversion-function-id: [C++ 12.3.2] 1335/// operator conversion-type-id 1336/// 1337/// conversion-type-id: 1338/// type-specifier-seq conversion-declarator[opt] 1339/// 1340/// conversion-declarator: 1341/// ptr-operator conversion-declarator[opt] 1342/// \endcode 1343/// 1344/// \param The nested-name-specifier that preceded this unqualified-id. If 1345/// non-empty, then we are parsing the unqualified-id of a qualified-id. 1346/// 1347/// \param EnteringContext whether we are entering the scope of the 1348/// nested-name-specifier. 1349/// 1350/// \param ObjectType if this unqualified-id occurs within a member access 1351/// expression, the type of the base object whose member is being accessed. 1352/// 1353/// \param Result on a successful parse, contains the parsed unqualified-id. 1354/// 1355/// \returns true if parsing fails, false otherwise. 1356bool Parser::ParseUnqualifiedIdOperator(CXXScopeSpec &SS, bool EnteringContext, 1357 ParsedType ObjectType, 1358 UnqualifiedId &Result) { 1359 assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword"); 1360 1361 // Consume the 'operator' keyword. 1362 SourceLocation KeywordLoc = ConsumeToken(); 1363 1364 // Determine what kind of operator name we have. 1365 unsigned SymbolIdx = 0; 1366 SourceLocation SymbolLocations[3]; 1367 OverloadedOperatorKind Op = OO_None; 1368 switch (Tok.getKind()) { 1369 case tok::kw_new: 1370 case tok::kw_delete: { 1371 bool isNew = Tok.getKind() == tok::kw_new; 1372 // Consume the 'new' or 'delete'. 1373 SymbolLocations[SymbolIdx++] = ConsumeToken(); 1374 if (Tok.is(tok::l_square)) { 1375 // Consume the '['. 1376 SourceLocation LBracketLoc = ConsumeBracket(); 1377 // Consume the ']'. 1378 SourceLocation RBracketLoc = MatchRHSPunctuation(tok::r_square, 1379 LBracketLoc); 1380 if (RBracketLoc.isInvalid()) 1381 return true; 1382 1383 SymbolLocations[SymbolIdx++] = LBracketLoc; 1384 SymbolLocations[SymbolIdx++] = RBracketLoc; 1385 Op = isNew? OO_Array_New : OO_Array_Delete; 1386 } else { 1387 Op = isNew? OO_New : OO_Delete; 1388 } 1389 break; 1390 } 1391 1392#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 1393 case tok::Token: \ 1394 SymbolLocations[SymbolIdx++] = ConsumeToken(); \ 1395 Op = OO_##Name; \ 1396 break; 1397#define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly) 1398#include "clang/Basic/OperatorKinds.def" 1399 1400 case tok::l_paren: { 1401 // Consume the '('. 1402 SourceLocation LParenLoc = ConsumeParen(); 1403 // Consume the ')'. 1404 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, 1405 LParenLoc); 1406 if (RParenLoc.isInvalid()) 1407 return true; 1408 1409 SymbolLocations[SymbolIdx++] = LParenLoc; 1410 SymbolLocations[SymbolIdx++] = RParenLoc; 1411 Op = OO_Call; 1412 break; 1413 } 1414 1415 case tok::l_square: { 1416 // Consume the '['. 1417 SourceLocation LBracketLoc = ConsumeBracket(); 1418 // Consume the ']'. 1419 SourceLocation RBracketLoc = MatchRHSPunctuation(tok::r_square, 1420 LBracketLoc); 1421 if (RBracketLoc.isInvalid()) 1422 return true; 1423 1424 SymbolLocations[SymbolIdx++] = LBracketLoc; 1425 SymbolLocations[SymbolIdx++] = RBracketLoc; 1426 Op = OO_Subscript; 1427 break; 1428 } 1429 1430 case tok::code_completion: { 1431 // Code completion for the operator name. 1432 Actions.CodeCompleteOperatorName(getCurScope()); 1433 1434 // Consume the operator token. 1435 ConsumeCodeCompletionToken(); 1436 1437 // Don't try to parse any further. 1438 return true; 1439 } 1440 1441 default: 1442 break; 1443 } 1444 1445 if (Op != OO_None) { 1446 // We have parsed an operator-function-id. 1447 Result.setOperatorFunctionId(KeywordLoc, Op, SymbolLocations); 1448 return false; 1449 } 1450 1451 // Parse a literal-operator-id. 1452 // 1453 // literal-operator-id: [C++0x 13.5.8] 1454 // operator "" identifier 1455 1456 if (getLang().CPlusPlus0x && Tok.is(tok::string_literal)) { 1457 if (Tok.getLength() != 2) 1458 Diag(Tok.getLocation(), diag::err_operator_string_not_empty); 1459 ConsumeStringToken(); 1460 1461 if (Tok.isNot(tok::identifier)) { 1462 Diag(Tok.getLocation(), diag::err_expected_ident); 1463 return true; 1464 } 1465 1466 IdentifierInfo *II = Tok.getIdentifierInfo(); 1467 Result.setLiteralOperatorId(II, KeywordLoc, ConsumeToken()); 1468 return false; 1469 } 1470 1471 // Parse a conversion-function-id. 1472 // 1473 // conversion-function-id: [C++ 12.3.2] 1474 // operator conversion-type-id 1475 // 1476 // conversion-type-id: 1477 // type-specifier-seq conversion-declarator[opt] 1478 // 1479 // conversion-declarator: 1480 // ptr-operator conversion-declarator[opt] 1481 1482 // Parse the type-specifier-seq. 1483 DeclSpec DS(AttrFactory); 1484 if (ParseCXXTypeSpecifierSeq(DS)) // FIXME: ObjectType? 1485 return true; 1486 1487 // Parse the conversion-declarator, which is merely a sequence of 1488 // ptr-operators. 1489 Declarator D(DS, Declarator::TypeNameContext); 1490 ParseDeclaratorInternal(D, /*DirectDeclParser=*/0); 1491 1492 // Finish up the type. 1493 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), D); 1494 if (Ty.isInvalid()) 1495 return true; 1496 1497 // Note that this is a conversion-function-id. 1498 Result.setConversionFunctionId(KeywordLoc, Ty.get(), 1499 D.getSourceRange().getEnd()); 1500 return false; 1501} 1502 1503/// \brief Parse a C++ unqualified-id (or a C identifier), which describes the 1504/// name of an entity. 1505/// 1506/// \code 1507/// unqualified-id: [C++ expr.prim.general] 1508/// identifier 1509/// operator-function-id 1510/// conversion-function-id 1511/// [C++0x] literal-operator-id [TODO] 1512/// ~ class-name 1513/// template-id 1514/// 1515/// \endcode 1516/// 1517/// \param The nested-name-specifier that preceded this unqualified-id. If 1518/// non-empty, then we are parsing the unqualified-id of a qualified-id. 1519/// 1520/// \param EnteringContext whether we are entering the scope of the 1521/// nested-name-specifier. 1522/// 1523/// \param AllowDestructorName whether we allow parsing of a destructor name. 1524/// 1525/// \param AllowConstructorName whether we allow parsing a constructor name. 1526/// 1527/// \param ObjectType if this unqualified-id occurs within a member access 1528/// expression, the type of the base object whose member is being accessed. 1529/// 1530/// \param Result on a successful parse, contains the parsed unqualified-id. 1531/// 1532/// \returns true if parsing fails, false otherwise. 1533bool Parser::ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext, 1534 bool AllowDestructorName, 1535 bool AllowConstructorName, 1536 ParsedType ObjectType, 1537 UnqualifiedId &Result) { 1538 1539 // Handle 'A::template B'. This is for template-ids which have not 1540 // already been annotated by ParseOptionalCXXScopeSpecifier(). 1541 bool TemplateSpecified = false; 1542 SourceLocation TemplateKWLoc; 1543 if (getLang().CPlusPlus && Tok.is(tok::kw_template) && 1544 (ObjectType || SS.isSet())) { 1545 TemplateSpecified = true; 1546 TemplateKWLoc = ConsumeToken(); 1547 } 1548 1549 // unqualified-id: 1550 // identifier 1551 // template-id (when it hasn't already been annotated) 1552 if (Tok.is(tok::identifier)) { 1553 // Consume the identifier. 1554 IdentifierInfo *Id = Tok.getIdentifierInfo(); 1555 SourceLocation IdLoc = ConsumeToken(); 1556 1557 if (!getLang().CPlusPlus) { 1558 // If we're not in C++, only identifiers matter. Record the 1559 // identifier and return. 1560 Result.setIdentifier(Id, IdLoc); 1561 return false; 1562 } 1563 1564 if (AllowConstructorName && 1565 Actions.isCurrentClassName(*Id, getCurScope(), &SS)) { 1566 // We have parsed a constructor name. 1567 Result.setConstructorName(Actions.getTypeName(*Id, IdLoc, getCurScope(), 1568 &SS, false, false, 1569 ParsedType(), 1570 /*NonTrivialTypeSourceInfo=*/true), 1571 IdLoc, IdLoc); 1572 } else { 1573 // We have parsed an identifier. 1574 Result.setIdentifier(Id, IdLoc); 1575 } 1576 1577 // If the next token is a '<', we may have a template. 1578 if (TemplateSpecified || Tok.is(tok::less)) 1579 return ParseUnqualifiedIdTemplateId(SS, Id, IdLoc, EnteringContext, 1580 ObjectType, Result, 1581 TemplateSpecified, TemplateKWLoc); 1582 1583 return false; 1584 } 1585 1586 // unqualified-id: 1587 // template-id (already parsed and annotated) 1588 if (Tok.is(tok::annot_template_id)) { 1589 TemplateIdAnnotation *TemplateId 1590 = static_cast<TemplateIdAnnotation*>(Tok.getAnnotationValue()); 1591 1592 // If the template-name names the current class, then this is a constructor 1593 if (AllowConstructorName && TemplateId->Name && 1594 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) { 1595 if (SS.isSet()) { 1596 // C++ [class.qual]p2 specifies that a qualified template-name 1597 // is taken as the constructor name where a constructor can be 1598 // declared. Thus, the template arguments are extraneous, so 1599 // complain about them and remove them entirely. 1600 Diag(TemplateId->TemplateNameLoc, 1601 diag::err_out_of_line_constructor_template_id) 1602 << TemplateId->Name 1603 << FixItHint::CreateRemoval( 1604 SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)); 1605 Result.setConstructorName(Actions.getTypeName(*TemplateId->Name, 1606 TemplateId->TemplateNameLoc, 1607 getCurScope(), 1608 &SS, false, false, 1609 ParsedType(), 1610 /*NontrivialTypeSourceInfo=*/true), 1611 TemplateId->TemplateNameLoc, 1612 TemplateId->RAngleLoc); 1613 TemplateId->Destroy(); 1614 ConsumeToken(); 1615 return false; 1616 } 1617 1618 Result.setConstructorTemplateId(TemplateId); 1619 ConsumeToken(); 1620 return false; 1621 } 1622 1623 // We have already parsed a template-id; consume the annotation token as 1624 // our unqualified-id. 1625 Result.setTemplateId(TemplateId); 1626 ConsumeToken(); 1627 return false; 1628 } 1629 1630 // unqualified-id: 1631 // operator-function-id 1632 // conversion-function-id 1633 if (Tok.is(tok::kw_operator)) { 1634 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, Result)) 1635 return true; 1636 1637 // If we have an operator-function-id or a literal-operator-id and the next 1638 // token is a '<', we may have a 1639 // 1640 // template-id: 1641 // operator-function-id < template-argument-list[opt] > 1642 if ((Result.getKind() == UnqualifiedId::IK_OperatorFunctionId || 1643 Result.getKind() == UnqualifiedId::IK_LiteralOperatorId) && 1644 (TemplateSpecified || Tok.is(tok::less))) 1645 return ParseUnqualifiedIdTemplateId(SS, 0, SourceLocation(), 1646 EnteringContext, ObjectType, 1647 Result, 1648 TemplateSpecified, TemplateKWLoc); 1649 1650 return false; 1651 } 1652 1653 if (getLang().CPlusPlus && 1654 (AllowDestructorName || SS.isSet()) && Tok.is(tok::tilde)) { 1655 // C++ [expr.unary.op]p10: 1656 // There is an ambiguity in the unary-expression ~X(), where X is a 1657 // class-name. The ambiguity is resolved in favor of treating ~ as a 1658 // unary complement rather than treating ~X as referring to a destructor. 1659 1660 // Parse the '~'. 1661 SourceLocation TildeLoc = ConsumeToken(); 1662 1663 // Parse the class-name. 1664 if (Tok.isNot(tok::identifier)) { 1665 Diag(Tok, diag::err_destructor_tilde_identifier); 1666 return true; 1667 } 1668 1669 // Parse the class-name (or template-name in a simple-template-id). 1670 IdentifierInfo *ClassName = Tok.getIdentifierInfo(); 1671 SourceLocation ClassNameLoc = ConsumeToken(); 1672 1673 if (TemplateSpecified || Tok.is(tok::less)) { 1674 Result.setDestructorName(TildeLoc, ParsedType(), ClassNameLoc); 1675 return ParseUnqualifiedIdTemplateId(SS, ClassName, ClassNameLoc, 1676 EnteringContext, ObjectType, Result, 1677 TemplateSpecified, TemplateKWLoc); 1678 } 1679 1680 // Note that this is a destructor name. 1681 ParsedType Ty = Actions.getDestructorName(TildeLoc, *ClassName, 1682 ClassNameLoc, getCurScope(), 1683 SS, ObjectType, 1684 EnteringContext); 1685 if (!Ty) 1686 return true; 1687 1688 Result.setDestructorName(TildeLoc, Ty, ClassNameLoc); 1689 return false; 1690 } 1691 1692 Diag(Tok, diag::err_expected_unqualified_id) 1693 << getLang().CPlusPlus; 1694 return true; 1695} 1696 1697/// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate 1698/// memory in a typesafe manner and call constructors. 1699/// 1700/// This method is called to parse the new expression after the optional :: has 1701/// been already parsed. If the :: was present, "UseGlobal" is true and "Start" 1702/// is its location. Otherwise, "Start" is the location of the 'new' token. 1703/// 1704/// new-expression: 1705/// '::'[opt] 'new' new-placement[opt] new-type-id 1706/// new-initializer[opt] 1707/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 1708/// new-initializer[opt] 1709/// 1710/// new-placement: 1711/// '(' expression-list ')' 1712/// 1713/// new-type-id: 1714/// type-specifier-seq new-declarator[opt] 1715/// [GNU] attributes type-specifier-seq new-declarator[opt] 1716/// 1717/// new-declarator: 1718/// ptr-operator new-declarator[opt] 1719/// direct-new-declarator 1720/// 1721/// new-initializer: 1722/// '(' expression-list[opt] ')' 1723/// [C++0x] braced-init-list [TODO] 1724/// 1725ExprResult 1726Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) { 1727 assert(Tok.is(tok::kw_new) && "expected 'new' token"); 1728 ConsumeToken(); // Consume 'new' 1729 1730 // A '(' now can be a new-placement or the '(' wrapping the type-id in the 1731 // second form of new-expression. It can't be a new-type-id. 1732 1733 ExprVector PlacementArgs(Actions); 1734 SourceLocation PlacementLParen, PlacementRParen; 1735 1736 SourceRange TypeIdParens; 1737 DeclSpec DS(AttrFactory); 1738 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1739 if (Tok.is(tok::l_paren)) { 1740 // If it turns out to be a placement, we change the type location. 1741 PlacementLParen = ConsumeParen(); 1742 if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) { 1743 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 1744 return ExprError(); 1745 } 1746 1747 PlacementRParen = MatchRHSPunctuation(tok::r_paren, PlacementLParen); 1748 if (PlacementRParen.isInvalid()) { 1749 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 1750 return ExprError(); 1751 } 1752 1753 if (PlacementArgs.empty()) { 1754 // Reset the placement locations. There was no placement. 1755 TypeIdParens = SourceRange(PlacementLParen, PlacementRParen); 1756 PlacementLParen = PlacementRParen = SourceLocation(); 1757 } else { 1758 // We still need the type. 1759 if (Tok.is(tok::l_paren)) { 1760 TypeIdParens.setBegin(ConsumeParen()); 1761 MaybeParseGNUAttributes(DeclaratorInfo); 1762 ParseSpecifierQualifierList(DS); 1763 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 1764 ParseDeclarator(DeclaratorInfo); 1765 TypeIdParens.setEnd(MatchRHSPunctuation(tok::r_paren, 1766 TypeIdParens.getBegin())); 1767 } else { 1768 MaybeParseGNUAttributes(DeclaratorInfo); 1769 if (ParseCXXTypeSpecifierSeq(DS)) 1770 DeclaratorInfo.setInvalidType(true); 1771 else { 1772 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 1773 ParseDeclaratorInternal(DeclaratorInfo, 1774 &Parser::ParseDirectNewDeclarator); 1775 } 1776 } 1777 } 1778 } else { 1779 // A new-type-id is a simplified type-id, where essentially the 1780 // direct-declarator is replaced by a direct-new-declarator. 1781 MaybeParseGNUAttributes(DeclaratorInfo); 1782 if (ParseCXXTypeSpecifierSeq(DS)) 1783 DeclaratorInfo.setInvalidType(true); 1784 else { 1785 DeclaratorInfo.SetSourceRange(DS.getSourceRange()); 1786 ParseDeclaratorInternal(DeclaratorInfo, 1787 &Parser::ParseDirectNewDeclarator); 1788 } 1789 } 1790 if (DeclaratorInfo.isInvalidType()) { 1791 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 1792 return ExprError(); 1793 } 1794 1795 ExprVector ConstructorArgs(Actions); 1796 SourceLocation ConstructorLParen, ConstructorRParen; 1797 1798 if (Tok.is(tok::l_paren)) { 1799 ConstructorLParen = ConsumeParen(); 1800 if (Tok.isNot(tok::r_paren)) { 1801 CommaLocsTy CommaLocs; 1802 if (ParseExpressionList(ConstructorArgs, CommaLocs)) { 1803 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 1804 return ExprError(); 1805 } 1806 } 1807 ConstructorRParen = MatchRHSPunctuation(tok::r_paren, ConstructorLParen); 1808 if (ConstructorRParen.isInvalid()) { 1809 SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true); 1810 return ExprError(); 1811 } 1812 } 1813 1814 return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen, 1815 move_arg(PlacementArgs), PlacementRParen, 1816 TypeIdParens, DeclaratorInfo, ConstructorLParen, 1817 move_arg(ConstructorArgs), ConstructorRParen); 1818} 1819 1820/// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be 1821/// passed to ParseDeclaratorInternal. 1822/// 1823/// direct-new-declarator: 1824/// '[' expression ']' 1825/// direct-new-declarator '[' constant-expression ']' 1826/// 1827void Parser::ParseDirectNewDeclarator(Declarator &D) { 1828 // Parse the array dimensions. 1829 bool first = true; 1830 while (Tok.is(tok::l_square)) { 1831 SourceLocation LLoc = ConsumeBracket(); 1832 ExprResult Size(first ? ParseExpression() 1833 : ParseConstantExpression()); 1834 if (Size.isInvalid()) { 1835 // Recover 1836 SkipUntil(tok::r_square); 1837 return; 1838 } 1839 first = false; 1840 1841 SourceLocation RLoc = MatchRHSPunctuation(tok::r_square, LLoc); 1842 1843 ParsedAttributes attrs(AttrFactory); 1844 D.AddTypeInfo(DeclaratorChunk::getArray(0, 1845 /*static=*/false, /*star=*/false, 1846 Size.release(), LLoc, RLoc), 1847 attrs, RLoc); 1848 1849 if (RLoc.isInvalid()) 1850 return; 1851 } 1852} 1853 1854/// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id. 1855/// This ambiguity appears in the syntax of the C++ new operator. 1856/// 1857/// new-expression: 1858/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 1859/// new-initializer[opt] 1860/// 1861/// new-placement: 1862/// '(' expression-list ')' 1863/// 1864bool Parser::ParseExpressionListOrTypeId( 1865 llvm::SmallVectorImpl<Expr*> &PlacementArgs, 1866 Declarator &D) { 1867 // The '(' was already consumed. 1868 if (isTypeIdInParens()) { 1869 ParseSpecifierQualifierList(D.getMutableDeclSpec()); 1870 D.SetSourceRange(D.getDeclSpec().getSourceRange()); 1871 ParseDeclarator(D); 1872 return D.isInvalidType(); 1873 } 1874 1875 // It's not a type, it has to be an expression list. 1876 // Discard the comma locations - ActOnCXXNew has enough parameters. 1877 CommaLocsTy CommaLocs; 1878 return ParseExpressionList(PlacementArgs, CommaLocs); 1879} 1880 1881/// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used 1882/// to free memory allocated by new. 1883/// 1884/// This method is called to parse the 'delete' expression after the optional 1885/// '::' has been already parsed. If the '::' was present, "UseGlobal" is true 1886/// and "Start" is its location. Otherwise, "Start" is the location of the 1887/// 'delete' token. 1888/// 1889/// delete-expression: 1890/// '::'[opt] 'delete' cast-expression 1891/// '::'[opt] 'delete' '[' ']' cast-expression 1892ExprResult 1893Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) { 1894 assert(Tok.is(tok::kw_delete) && "Expected 'delete' keyword"); 1895 ConsumeToken(); // Consume 'delete' 1896 1897 // Array delete? 1898 bool ArrayDelete = false; 1899 if (Tok.is(tok::l_square)) { 1900 ArrayDelete = true; 1901 SourceLocation LHS = ConsumeBracket(); 1902 SourceLocation RHS = MatchRHSPunctuation(tok::r_square, LHS); 1903 if (RHS.isInvalid()) 1904 return ExprError(); 1905 } 1906 1907 ExprResult Operand(ParseCastExpression(false)); 1908 if (Operand.isInvalid()) 1909 return move(Operand); 1910 1911 return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, Operand.take()); 1912} 1913 1914static UnaryTypeTrait UnaryTypeTraitFromTokKind(tok::TokenKind kind) { 1915 switch(kind) { 1916 default: llvm_unreachable("Not a known unary type trait"); 1917 case tok::kw___has_nothrow_assign: return UTT_HasNothrowAssign; 1918 case tok::kw___has_nothrow_copy: return UTT_HasNothrowCopy; 1919 case tok::kw___has_nothrow_constructor: return UTT_HasNothrowConstructor; 1920 case tok::kw___has_trivial_assign: return UTT_HasTrivialAssign; 1921 case tok::kw___has_trivial_copy: return UTT_HasTrivialCopy; 1922 case tok::kw___has_trivial_constructor: return UTT_HasTrivialConstructor; 1923 case tok::kw___has_trivial_destructor: return UTT_HasTrivialDestructor; 1924 case tok::kw___has_virtual_destructor: return UTT_HasVirtualDestructor; 1925 case tok::kw___is_abstract: return UTT_IsAbstract; 1926 case tok::kw___is_class: return UTT_IsClass; 1927 case tok::kw___is_empty: return UTT_IsEmpty; 1928 case tok::kw___is_enum: return UTT_IsEnum; 1929 case tok::kw___is_literal: return UTT_IsLiteral; 1930 case tok::kw___is_pod: return UTT_IsPOD; 1931 case tok::kw___is_polymorphic: return UTT_IsPolymorphic; 1932 case tok::kw___is_trivial: return UTT_IsTrivial; 1933 case tok::kw___is_union: return UTT_IsUnion; 1934 } 1935} 1936 1937static BinaryTypeTrait BinaryTypeTraitFromTokKind(tok::TokenKind kind) { 1938 switch(kind) { 1939 default: llvm_unreachable("Not a known binary type trait"); 1940 case tok::kw___is_base_of: return BTT_IsBaseOf; 1941 case tok::kw___builtin_types_compatible_p: return BTT_TypeCompatible; 1942 case tok::kw___is_convertible_to: return BTT_IsConvertibleTo; 1943 } 1944} 1945 1946/// ParseUnaryTypeTrait - Parse the built-in unary type-trait 1947/// pseudo-functions that allow implementation of the TR1/C++0x type traits 1948/// templates. 1949/// 1950/// primary-expression: 1951/// [GNU] unary-type-trait '(' type-id ')' 1952/// 1953ExprResult Parser::ParseUnaryTypeTrait() { 1954 UnaryTypeTrait UTT = UnaryTypeTraitFromTokKind(Tok.getKind()); 1955 SourceLocation Loc = ConsumeToken(); 1956 1957 SourceLocation LParen = Tok.getLocation(); 1958 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen)) 1959 return ExprError(); 1960 1961 // FIXME: Error reporting absolutely sucks! If the this fails to parse a type 1962 // there will be cryptic errors about mismatched parentheses and missing 1963 // specifiers. 1964 TypeResult Ty = ParseTypeName(); 1965 1966 SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen); 1967 1968 if (Ty.isInvalid()) 1969 return ExprError(); 1970 1971 return Actions.ActOnUnaryTypeTrait(UTT, Loc, Ty.get(), RParen); 1972} 1973 1974/// ParseBinaryTypeTrait - Parse the built-in binary type-trait 1975/// pseudo-functions that allow implementation of the TR1/C++0x type traits 1976/// templates. 1977/// 1978/// primary-expression: 1979/// [GNU] binary-type-trait '(' type-id ',' type-id ')' 1980/// 1981ExprResult Parser::ParseBinaryTypeTrait() { 1982 BinaryTypeTrait BTT = BinaryTypeTraitFromTokKind(Tok.getKind()); 1983 SourceLocation Loc = ConsumeToken(); 1984 1985 SourceLocation LParen = Tok.getLocation(); 1986 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen)) 1987 return ExprError(); 1988 1989 TypeResult LhsTy = ParseTypeName(); 1990 if (LhsTy.isInvalid()) { 1991 SkipUntil(tok::r_paren); 1992 return ExprError(); 1993 } 1994 1995 if (ExpectAndConsume(tok::comma, diag::err_expected_comma)) { 1996 SkipUntil(tok::r_paren); 1997 return ExprError(); 1998 } 1999 2000 TypeResult RhsTy = ParseTypeName(); 2001 if (RhsTy.isInvalid()) { 2002 SkipUntil(tok::r_paren); 2003 return ExprError(); 2004 } 2005 2006 SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen); 2007 2008 return Actions.ActOnBinaryTypeTrait(BTT, Loc, LhsTy.get(), RhsTy.get(), RParen); 2009} 2010 2011/// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a 2012/// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate 2013/// based on the context past the parens. 2014ExprResult 2015Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType, 2016 ParsedType &CastTy, 2017 SourceLocation LParenLoc, 2018 SourceLocation &RParenLoc) { 2019 assert(getLang().CPlusPlus && "Should only be called for C++!"); 2020 assert(ExprType == CastExpr && "Compound literals are not ambiguous!"); 2021 assert(isTypeIdInParens() && "Not a type-id!"); 2022 2023 ExprResult Result(true); 2024 CastTy = ParsedType(); 2025 2026 // We need to disambiguate a very ugly part of the C++ syntax: 2027 // 2028 // (T())x; - type-id 2029 // (T())*x; - type-id 2030 // (T())/x; - expression 2031 // (T()); - expression 2032 // 2033 // The bad news is that we cannot use the specialized tentative parser, since 2034 // it can only verify that the thing inside the parens can be parsed as 2035 // type-id, it is not useful for determining the context past the parens. 2036 // 2037 // The good news is that the parser can disambiguate this part without 2038 // making any unnecessary Action calls. 2039 // 2040 // It uses a scheme similar to parsing inline methods. The parenthesized 2041 // tokens are cached, the context that follows is determined (possibly by 2042 // parsing a cast-expression), and then we re-introduce the cached tokens 2043 // into the token stream and parse them appropriately. 2044 2045 ParenParseOption ParseAs; 2046 CachedTokens Toks; 2047 2048 // Store the tokens of the parentheses. We will parse them after we determine 2049 // the context that follows them. 2050 if (!ConsumeAndStoreUntil(tok::r_paren, Toks)) { 2051 // We didn't find the ')' we expected. 2052 MatchRHSPunctuation(tok::r_paren, LParenLoc); 2053 return ExprError(); 2054 } 2055 2056 if (Tok.is(tok::l_brace)) { 2057 ParseAs = CompoundLiteral; 2058 } else { 2059 bool NotCastExpr; 2060 // FIXME: Special-case ++ and --: "(S())++;" is not a cast-expression 2061 if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) { 2062 NotCastExpr = true; 2063 } else { 2064 // Try parsing the cast-expression that may follow. 2065 // If it is not a cast-expression, NotCastExpr will be true and no token 2066 // will be consumed. 2067 Result = ParseCastExpression(false/*isUnaryExpression*/, 2068 false/*isAddressofOperand*/, 2069 NotCastExpr, 2070 ParsedType()/*TypeOfCast*/); 2071 } 2072 2073 // If we parsed a cast-expression, it's really a type-id, otherwise it's 2074 // an expression. 2075 ParseAs = NotCastExpr ? SimpleExpr : CastExpr; 2076 } 2077 2078 // The current token should go after the cached tokens. 2079 Toks.push_back(Tok); 2080 // Re-enter the stored parenthesized tokens into the token stream, so we may 2081 // parse them now. 2082 PP.EnterTokenStream(Toks.data(), Toks.size(), 2083 true/*DisableMacroExpansion*/, false/*OwnsTokens*/); 2084 // Drop the current token and bring the first cached one. It's the same token 2085 // as when we entered this function. 2086 ConsumeAnyToken(); 2087 2088 if (ParseAs >= CompoundLiteral) { 2089 TypeResult Ty = ParseTypeName(); 2090 2091 // Match the ')'. 2092 if (Tok.is(tok::r_paren)) 2093 RParenLoc = ConsumeParen(); 2094 else 2095 MatchRHSPunctuation(tok::r_paren, LParenLoc); 2096 2097 if (ParseAs == CompoundLiteral) { 2098 ExprType = CompoundLiteral; 2099 return ParseCompoundLiteralExpression(Ty.get(), LParenLoc, RParenLoc); 2100 } 2101 2102 // We parsed '(' type-id ')' and the thing after it wasn't a '{'. 2103 assert(ParseAs == CastExpr); 2104 2105 if (Ty.isInvalid()) 2106 return ExprError(); 2107 2108 CastTy = Ty.get(); 2109 2110 // Result is what ParseCastExpression returned earlier. 2111 if (!Result.isInvalid()) 2112 Result = Actions.ActOnCastExpr(getCurScope(), LParenLoc, CastTy, RParenLoc, 2113 Result.take()); 2114 return move(Result); 2115 } 2116 2117 // Not a compound literal, and not followed by a cast-expression. 2118 assert(ParseAs == SimpleExpr); 2119 2120 ExprType = SimpleExpr; 2121 Result = ParseExpression(); 2122 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 2123 Result = Actions.ActOnParenExpr(LParenLoc, Tok.getLocation(), Result.take()); 2124 2125 // Match the ')'. 2126 if (Result.isInvalid()) { 2127 SkipUntil(tok::r_paren); 2128 return ExprError(); 2129 } 2130 2131 if (Tok.is(tok::r_paren)) 2132 RParenLoc = ConsumeParen(); 2133 else 2134 MatchRHSPunctuation(tok::r_paren, LParenLoc); 2135 2136 return move(Result); 2137} 2138