Parser.cpp revision 218893
1//===--- Parser.cpp - C Language Family Parser ----------------------------===// 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 Parser interfaces. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Parse/Parser.h" 15#include "clang/Parse/ParseDiagnostic.h" 16#include "clang/Sema/DeclSpec.h" 17#include "clang/Sema/Scope.h" 18#include "clang/Sema/ParsedTemplate.h" 19#include "llvm/Support/raw_ostream.h" 20#include "RAIIObjectsForParser.h" 21#include "ParsePragma.h" 22using namespace clang; 23 24Parser::Parser(Preprocessor &pp, Sema &actions) 25 : CrashInfo(*this), PP(pp), Actions(actions), Diags(PP.getDiagnostics()), 26 GreaterThanIsOperator(true), ColonIsSacred(false), 27 InMessageExpression(false), TemplateParameterDepth(0) { 28 Tok.setKind(tok::eof); 29 Actions.CurScope = 0; 30 NumCachedScopes = 0; 31 ParenCount = BracketCount = BraceCount = 0; 32 ObjCImpDecl = 0; 33 34 // Add #pragma handlers. These are removed and destroyed in the 35 // destructor. 36 AlignHandler.reset(new PragmaAlignHandler(actions)); 37 PP.AddPragmaHandler(AlignHandler.get()); 38 39 GCCVisibilityHandler.reset(new PragmaGCCVisibilityHandler(actions)); 40 PP.AddPragmaHandler("GCC", GCCVisibilityHandler.get()); 41 42 OptionsHandler.reset(new PragmaOptionsHandler(actions)); 43 PP.AddPragmaHandler(OptionsHandler.get()); 44 45 PackHandler.reset(new PragmaPackHandler(actions)); 46 PP.AddPragmaHandler(PackHandler.get()); 47 48 UnusedHandler.reset(new PragmaUnusedHandler(actions, *this)); 49 PP.AddPragmaHandler(UnusedHandler.get()); 50 51 WeakHandler.reset(new PragmaWeakHandler(actions)); 52 PP.AddPragmaHandler(WeakHandler.get()); 53 54 FPContractHandler.reset(new PragmaFPContractHandler(actions, *this)); 55 PP.AddPragmaHandler("STDC", FPContractHandler.get()); 56 57 if (getLang().OpenCL) { 58 OpenCLExtensionHandler.reset( 59 new PragmaOpenCLExtensionHandler(actions, *this)); 60 PP.AddPragmaHandler("OPENCL", OpenCLExtensionHandler.get()); 61 62 PP.AddPragmaHandler("OPENCL", FPContractHandler.get()); 63 } 64 65 PP.setCodeCompletionHandler(*this); 66} 67 68/// If a crash happens while the parser is active, print out a line indicating 69/// what the current token is. 70void PrettyStackTraceParserEntry::print(llvm::raw_ostream &OS) const { 71 const Token &Tok = P.getCurToken(); 72 if (Tok.is(tok::eof)) { 73 OS << "<eof> parser at end of file\n"; 74 return; 75 } 76 77 if (Tok.getLocation().isInvalid()) { 78 OS << "<unknown> parser at unknown location\n"; 79 return; 80 } 81 82 const Preprocessor &PP = P.getPreprocessor(); 83 Tok.getLocation().print(OS, PP.getSourceManager()); 84 if (Tok.isAnnotation()) 85 OS << ": at annotation token \n"; 86 else 87 OS << ": current parser token '" << PP.getSpelling(Tok) << "'\n"; 88} 89 90 91DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) { 92 return Diags.Report(Loc, DiagID); 93} 94 95DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) { 96 return Diag(Tok.getLocation(), DiagID); 97} 98 99/// \brief Emits a diagnostic suggesting parentheses surrounding a 100/// given range. 101/// 102/// \param Loc The location where we'll emit the diagnostic. 103/// \param Loc The kind of diagnostic to emit. 104/// \param ParenRange Source range enclosing code that should be parenthesized. 105void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK, 106 SourceRange ParenRange) { 107 SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd()); 108 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) { 109 // We can't display the parentheses, so just dig the 110 // warning/error and return. 111 Diag(Loc, DK); 112 return; 113 } 114 115 Diag(Loc, DK) 116 << FixItHint::CreateInsertion(ParenRange.getBegin(), "(") 117 << FixItHint::CreateInsertion(EndLoc, ")"); 118} 119 120/// MatchRHSPunctuation - For punctuation with a LHS and RHS (e.g. '['/']'), 121/// this helper function matches and consumes the specified RHS token if 122/// present. If not present, it emits the specified diagnostic indicating 123/// that the parser failed to match the RHS of the token at LHSLoc. LHSName 124/// should be the name of the unmatched LHS token. 125SourceLocation Parser::MatchRHSPunctuation(tok::TokenKind RHSTok, 126 SourceLocation LHSLoc) { 127 128 if (Tok.is(RHSTok)) 129 return ConsumeAnyToken(); 130 131 SourceLocation R = Tok.getLocation(); 132 const char *LHSName = "unknown"; 133 diag::kind DID = diag::err_parse_error; 134 switch (RHSTok) { 135 default: break; 136 case tok::r_paren : LHSName = "("; DID = diag::err_expected_rparen; break; 137 case tok::r_brace : LHSName = "{"; DID = diag::err_expected_rbrace; break; 138 case tok::r_square: LHSName = "["; DID = diag::err_expected_rsquare; break; 139 case tok::greater: LHSName = "<"; DID = diag::err_expected_greater; break; 140 case tok::greatergreatergreater: 141 LHSName = "<<<"; DID = diag::err_expected_ggg; break; 142 } 143 Diag(Tok, DID); 144 Diag(LHSLoc, diag::note_matching) << LHSName; 145 SkipUntil(RHSTok); 146 return R; 147} 148 149static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) { 150 switch (ExpectedTok) { 151 case tok::semi: return Tok.is(tok::colon); // : for ; 152 default: return false; 153 } 154} 155 156/// ExpectAndConsume - The parser expects that 'ExpectedTok' is next in the 157/// input. If so, it is consumed and false is returned. 158/// 159/// If the input is malformed, this emits the specified diagnostic. Next, if 160/// SkipToTok is specified, it calls SkipUntil(SkipToTok). Finally, true is 161/// returned. 162bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID, 163 const char *Msg, tok::TokenKind SkipToTok) { 164 if (Tok.is(ExpectedTok) || Tok.is(tok::code_completion)) { 165 ConsumeAnyToken(); 166 return false; 167 } 168 169 // Detect common single-character typos and resume. 170 if (IsCommonTypo(ExpectedTok, Tok)) { 171 SourceLocation Loc = Tok.getLocation(); 172 Diag(Loc, DiagID) 173 << Msg 174 << FixItHint::CreateReplacement(SourceRange(Loc), 175 getTokenSimpleSpelling(ExpectedTok)); 176 ConsumeAnyToken(); 177 178 // Pretend there wasn't a problem. 179 return false; 180 } 181 182 const char *Spelling = 0; 183 SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation); 184 if (EndLoc.isValid() && 185 (Spelling = tok::getTokenSimpleSpelling(ExpectedTok))) { 186 // Show what code to insert to fix this problem. 187 Diag(EndLoc, DiagID) 188 << Msg 189 << FixItHint::CreateInsertion(EndLoc, Spelling); 190 } else 191 Diag(Tok, DiagID) << Msg; 192 193 if (SkipToTok != tok::unknown) 194 SkipUntil(SkipToTok); 195 return true; 196} 197 198bool Parser::ExpectAndConsumeSemi(unsigned DiagID) { 199 if (Tok.is(tok::semi) || Tok.is(tok::code_completion)) { 200 ConsumeAnyToken(); 201 return false; 202 } 203 204 if ((Tok.is(tok::r_paren) || Tok.is(tok::r_square)) && 205 NextToken().is(tok::semi)) { 206 Diag(Tok, diag::err_extraneous_token_before_semi) 207 << PP.getSpelling(Tok) 208 << FixItHint::CreateRemoval(Tok.getLocation()); 209 ConsumeAnyToken(); // The ')' or ']'. 210 ConsumeToken(); // The ';'. 211 return false; 212 } 213 214 return ExpectAndConsume(tok::semi, DiagID); 215} 216 217//===----------------------------------------------------------------------===// 218// Error recovery. 219//===----------------------------------------------------------------------===// 220 221/// SkipUntil - Read tokens until we get to the specified token, then consume 222/// it (unless DontConsume is true). Because we cannot guarantee that the 223/// token will ever occur, this skips to the next token, or to some likely 224/// good stopping point. If StopAtSemi is true, skipping will stop at a ';' 225/// character. 226/// 227/// If SkipUntil finds the specified token, it returns true, otherwise it 228/// returns false. 229bool Parser::SkipUntil(const tok::TokenKind *Toks, unsigned NumToks, 230 bool StopAtSemi, bool DontConsume, 231 bool StopAtCodeCompletion) { 232 // We always want this function to skip at least one token if the first token 233 // isn't T and if not at EOF. 234 bool isFirstTokenSkipped = true; 235 while (1) { 236 // If we found one of the tokens, stop and return true. 237 for (unsigned i = 0; i != NumToks; ++i) { 238 if (Tok.is(Toks[i])) { 239 if (DontConsume) { 240 // Noop, don't consume the token. 241 } else { 242 ConsumeAnyToken(); 243 } 244 return true; 245 } 246 } 247 248 switch (Tok.getKind()) { 249 case tok::eof: 250 // Ran out of tokens. 251 return false; 252 253 case tok::code_completion: 254 if (!StopAtCodeCompletion) 255 ConsumeToken(); 256 return false; 257 258 case tok::l_paren: 259 // Recursively skip properly-nested parens. 260 ConsumeParen(); 261 SkipUntil(tok::r_paren, false, false, StopAtCodeCompletion); 262 break; 263 case tok::l_square: 264 // Recursively skip properly-nested square brackets. 265 ConsumeBracket(); 266 SkipUntil(tok::r_square, false, false, StopAtCodeCompletion); 267 break; 268 case tok::l_brace: 269 // Recursively skip properly-nested braces. 270 ConsumeBrace(); 271 SkipUntil(tok::r_brace, false, false, StopAtCodeCompletion); 272 break; 273 274 // Okay, we found a ']' or '}' or ')', which we think should be balanced. 275 // Since the user wasn't looking for this token (if they were, it would 276 // already be handled), this isn't balanced. If there is a LHS token at a 277 // higher level, we will assume that this matches the unbalanced token 278 // and return it. Otherwise, this is a spurious RHS token, which we skip. 279 case tok::r_paren: 280 if (ParenCount && !isFirstTokenSkipped) 281 return false; // Matches something. 282 ConsumeParen(); 283 break; 284 case tok::r_square: 285 if (BracketCount && !isFirstTokenSkipped) 286 return false; // Matches something. 287 ConsumeBracket(); 288 break; 289 case tok::r_brace: 290 if (BraceCount && !isFirstTokenSkipped) 291 return false; // Matches something. 292 ConsumeBrace(); 293 break; 294 295 case tok::string_literal: 296 case tok::wide_string_literal: 297 ConsumeStringToken(); 298 break; 299 case tok::semi: 300 if (StopAtSemi) 301 return false; 302 // FALL THROUGH. 303 default: 304 // Skip this token. 305 ConsumeToken(); 306 break; 307 } 308 isFirstTokenSkipped = false; 309 } 310} 311 312//===----------------------------------------------------------------------===// 313// Scope manipulation 314//===----------------------------------------------------------------------===// 315 316/// EnterScope - Start a new scope. 317void Parser::EnterScope(unsigned ScopeFlags) { 318 if (NumCachedScopes) { 319 Scope *N = ScopeCache[--NumCachedScopes]; 320 N->Init(getCurScope(), ScopeFlags); 321 Actions.CurScope = N; 322 } else { 323 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags); 324 } 325} 326 327/// ExitScope - Pop a scope off the scope stack. 328void Parser::ExitScope() { 329 assert(getCurScope() && "Scope imbalance!"); 330 331 // Inform the actions module that this scope is going away if there are any 332 // decls in it. 333 if (!getCurScope()->decl_empty()) 334 Actions.ActOnPopScope(Tok.getLocation(), getCurScope()); 335 336 Scope *OldScope = getCurScope(); 337 Actions.CurScope = OldScope->getParent(); 338 339 if (NumCachedScopes == ScopeCacheSize) 340 delete OldScope; 341 else 342 ScopeCache[NumCachedScopes++] = OldScope; 343} 344 345 346 347 348//===----------------------------------------------------------------------===// 349// C99 6.9: External Definitions. 350//===----------------------------------------------------------------------===// 351 352Parser::~Parser() { 353 // If we still have scopes active, delete the scope tree. 354 delete getCurScope(); 355 Actions.CurScope = 0; 356 357 // Free the scope cache. 358 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i) 359 delete ScopeCache[i]; 360 361 // Remove the pragma handlers we installed. 362 PP.RemovePragmaHandler(AlignHandler.get()); 363 AlignHandler.reset(); 364 PP.RemovePragmaHandler("GCC", GCCVisibilityHandler.get()); 365 GCCVisibilityHandler.reset(); 366 PP.RemovePragmaHandler(OptionsHandler.get()); 367 OptionsHandler.reset(); 368 PP.RemovePragmaHandler(PackHandler.get()); 369 PackHandler.reset(); 370 PP.RemovePragmaHandler(UnusedHandler.get()); 371 UnusedHandler.reset(); 372 PP.RemovePragmaHandler(WeakHandler.get()); 373 WeakHandler.reset(); 374 375 if (getLang().OpenCL) { 376 PP.RemovePragmaHandler("OPENCL", OpenCLExtensionHandler.get()); 377 OpenCLExtensionHandler.reset(); 378 PP.RemovePragmaHandler("OPENCL", FPContractHandler.get()); 379 } 380 381 PP.RemovePragmaHandler("STDC", FPContractHandler.get()); 382 FPContractHandler.reset(); 383 PP.clearCodeCompletionHandler(); 384} 385 386/// Initialize - Warm up the parser. 387/// 388void Parser::Initialize() { 389 // Create the translation unit scope. Install it as the current scope. 390 assert(getCurScope() == 0 && "A scope is already active?"); 391 EnterScope(Scope::DeclScope); 392 Actions.ActOnTranslationUnitScope(getCurScope()); 393 394 // Prime the lexer look-ahead. 395 ConsumeToken(); 396 397 if (Tok.is(tok::eof) && 398 !getLang().CPlusPlus) // Empty source file is an extension in C 399 Diag(Tok, diag::ext_empty_source_file); 400 401 // Initialization for Objective-C context sensitive keywords recognition. 402 // Referenced in Parser::ParseObjCTypeQualifierList. 403 if (getLang().ObjC1) { 404 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in"); 405 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out"); 406 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout"); 407 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway"); 408 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy"); 409 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref"); 410 } 411 412 Ident_final = 0; 413 Ident_override = 0; 414 415 Ident_super = &PP.getIdentifierTable().get("super"); 416 417 if (getLang().AltiVec) { 418 Ident_vector = &PP.getIdentifierTable().get("vector"); 419 Ident_pixel = &PP.getIdentifierTable().get("pixel"); 420 } 421} 422 423/// ParseTopLevelDecl - Parse one top-level declaration, return whatever the 424/// action tells us to. This returns true if the EOF was encountered. 425bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) { 426 427 while (Tok.is(tok::annot_pragma_unused)) 428 HandlePragmaUnused(); 429 430 Result = DeclGroupPtrTy(); 431 if (Tok.is(tok::eof)) { 432 Actions.ActOnEndOfTranslationUnit(); 433 return true; 434 } 435 436 ParsedAttributesWithRange attrs; 437 MaybeParseCXX0XAttributes(attrs); 438 MaybeParseMicrosoftAttributes(attrs); 439 440 Result = ParseExternalDeclaration(attrs); 441 return false; 442} 443 444/// ParseTranslationUnit: 445/// translation-unit: [C99 6.9] 446/// external-declaration 447/// translation-unit external-declaration 448void Parser::ParseTranslationUnit() { 449 Initialize(); 450 451 DeclGroupPtrTy Res; 452 while (!ParseTopLevelDecl(Res)) 453 /*parse them all*/; 454 455 ExitScope(); 456 assert(getCurScope() == 0 && "Scope imbalance!"); 457} 458 459/// ParseExternalDeclaration: 460/// 461/// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl] 462/// function-definition 463/// declaration 464/// [C++0x] empty-declaration 465/// [GNU] asm-definition 466/// [GNU] __extension__ external-declaration 467/// [OBJC] objc-class-definition 468/// [OBJC] objc-class-declaration 469/// [OBJC] objc-alias-declaration 470/// [OBJC] objc-protocol-definition 471/// [OBJC] objc-method-definition 472/// [OBJC] @end 473/// [C++] linkage-specification 474/// [GNU] asm-definition: 475/// simple-asm-expr ';' 476/// 477/// [C++0x] empty-declaration: 478/// ';' 479/// 480/// [C++0x/GNU] 'extern' 'template' declaration 481Parser::DeclGroupPtrTy 482Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs, 483 ParsingDeclSpec *DS) { 484 ParenBraceBracketBalancer BalancerRAIIObj(*this); 485 486 Decl *SingleDecl = 0; 487 switch (Tok.getKind()) { 488 case tok::semi: 489 if (!getLang().CPlusPlus0x) 490 Diag(Tok, diag::ext_top_level_semi) 491 << FixItHint::CreateRemoval(Tok.getLocation()); 492 493 ConsumeToken(); 494 // TODO: Invoke action for top-level semicolon. 495 return DeclGroupPtrTy(); 496 case tok::r_brace: 497 Diag(Tok, diag::err_expected_external_declaration); 498 ConsumeBrace(); 499 return DeclGroupPtrTy(); 500 case tok::eof: 501 Diag(Tok, diag::err_expected_external_declaration); 502 return DeclGroupPtrTy(); 503 case tok::kw___extension__: { 504 // __extension__ silences extension warnings in the subexpression. 505 ExtensionRAIIObject O(Diags); // Use RAII to do this. 506 ConsumeToken(); 507 return ParseExternalDeclaration(attrs); 508 } 509 case tok::kw_asm: { 510 ProhibitAttributes(attrs); 511 512 ExprResult Result(ParseSimpleAsm()); 513 514 ExpectAndConsume(tok::semi, diag::err_expected_semi_after, 515 "top-level asm block"); 516 517 if (Result.isInvalid()) 518 return DeclGroupPtrTy(); 519 SingleDecl = Actions.ActOnFileScopeAsmDecl(Tok.getLocation(), Result.get()); 520 break; 521 } 522 case tok::at: 523 // @ is not a legal token unless objc is enabled, no need to check for ObjC. 524 /// FIXME: ParseObjCAtDirectives should return a DeclGroup for things like 525 /// @class foo, bar; 526 SingleDecl = ParseObjCAtDirectives(); 527 break; 528 case tok::minus: 529 case tok::plus: 530 if (!getLang().ObjC1) { 531 Diag(Tok, diag::err_expected_external_declaration); 532 ConsumeToken(); 533 return DeclGroupPtrTy(); 534 } 535 SingleDecl = ParseObjCMethodDefinition(); 536 break; 537 case tok::code_completion: 538 Actions.CodeCompleteOrdinaryName(getCurScope(), 539 ObjCImpDecl? Sema::PCC_ObjCImplementation 540 : Sema::PCC_Namespace); 541 ConsumeCodeCompletionToken(); 542 return ParseExternalDeclaration(attrs); 543 case tok::kw_using: 544 case tok::kw_namespace: 545 case tok::kw_typedef: 546 case tok::kw_template: 547 case tok::kw_export: // As in 'export template' 548 case tok::kw_static_assert: 549 // A function definition cannot start with a these keywords. 550 { 551 SourceLocation DeclEnd; 552 StmtVector Stmts(Actions); 553 return ParseDeclaration(Stmts, Declarator::FileContext, DeclEnd, attrs); 554 } 555 556 case tok::kw_static: 557 // Parse (then ignore) 'static' prior to a template instantiation. This is 558 // a GCC extension that we intentionally do not support. 559 if (getLang().CPlusPlus && NextToken().is(tok::kw_template)) { 560 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored) 561 << 0; 562 SourceLocation DeclEnd; 563 StmtVector Stmts(Actions); 564 return ParseDeclaration(Stmts, Declarator::FileContext, DeclEnd, attrs); 565 } 566 goto dont_know; 567 568 case tok::kw_inline: 569 if (getLang().CPlusPlus) { 570 tok::TokenKind NextKind = NextToken().getKind(); 571 572 // Inline namespaces. Allowed as an extension even in C++03. 573 if (NextKind == tok::kw_namespace) { 574 SourceLocation DeclEnd; 575 StmtVector Stmts(Actions); 576 return ParseDeclaration(Stmts, Declarator::FileContext, DeclEnd, attrs); 577 } 578 579 // Parse (then ignore) 'inline' prior to a template instantiation. This is 580 // a GCC extension that we intentionally do not support. 581 if (NextKind == tok::kw_template) { 582 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored) 583 << 1; 584 SourceLocation DeclEnd; 585 StmtVector Stmts(Actions); 586 return ParseDeclaration(Stmts, Declarator::FileContext, DeclEnd, attrs); 587 } 588 } 589 goto dont_know; 590 591 case tok::kw_extern: 592 if (getLang().CPlusPlus && NextToken().is(tok::kw_template)) { 593 // Extern templates 594 SourceLocation ExternLoc = ConsumeToken(); 595 SourceLocation TemplateLoc = ConsumeToken(); 596 SourceLocation DeclEnd; 597 return Actions.ConvertDeclToDeclGroup( 598 ParseExplicitInstantiation(ExternLoc, TemplateLoc, DeclEnd)); 599 } 600 // FIXME: Detect C++ linkage specifications here? 601 goto dont_know; 602 603 default: 604 dont_know: 605 // We can't tell whether this is a function-definition or declaration yet. 606 if (DS) { 607 DS->takeAttributesFrom(attrs); 608 return ParseDeclarationOrFunctionDefinition(*DS); 609 } else { 610 return ParseDeclarationOrFunctionDefinition(attrs); 611 } 612 } 613 614 // This routine returns a DeclGroup, if the thing we parsed only contains a 615 // single decl, convert it now. 616 return Actions.ConvertDeclToDeclGroup(SingleDecl); 617} 618 619/// \brief Determine whether the current token, if it occurs after a 620/// declarator, continues a declaration or declaration list. 621bool Parser::isDeclarationAfterDeclarator() const { 622 return Tok.is(tok::equal) || // int X()= -> not a function def 623 Tok.is(tok::comma) || // int X(), -> not a function def 624 Tok.is(tok::semi) || // int X(); -> not a function def 625 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def 626 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def 627 (getLang().CPlusPlus && 628 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++] 629} 630 631/// \brief Determine whether the current token, if it occurs after a 632/// declarator, indicates the start of a function definition. 633bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) { 634 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator"); 635 if (Tok.is(tok::l_brace)) // int X() {} 636 return true; 637 638 // Handle K&R C argument lists: int X(f) int f; {} 639 if (!getLang().CPlusPlus && 640 Declarator.getFunctionTypeInfo().isKNRPrototype()) 641 return isDeclarationSpecifier(); 642 643 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors) 644 Tok.is(tok::kw_try); // X() try { ... } 645} 646 647/// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or 648/// a declaration. We can't tell which we have until we read up to the 649/// compound-statement in function-definition. TemplateParams, if 650/// non-NULL, provides the template parameters when we're parsing a 651/// C++ template-declaration. 652/// 653/// function-definition: [C99 6.9.1] 654/// decl-specs declarator declaration-list[opt] compound-statement 655/// [C90] function-definition: [C99 6.7.1] - implicit int result 656/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement 657/// 658/// declaration: [C99 6.7] 659/// declaration-specifiers init-declarator-list[opt] ';' 660/// [!C99] init-declarator-list ';' [TODO: warn in c99 mode] 661/// [OMP] threadprivate-directive [TODO] 662/// 663Parser::DeclGroupPtrTy 664Parser::ParseDeclarationOrFunctionDefinition(ParsingDeclSpec &DS, 665 AccessSpecifier AS) { 666 // Parse the common declaration-specifiers piece. 667 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level); 668 669 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };" 670 // declaration-specifiers init-declarator-list[opt] ';' 671 if (Tok.is(tok::semi)) { 672 ConsumeToken(); 673 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS); 674 DS.complete(TheDecl); 675 return Actions.ConvertDeclToDeclGroup(TheDecl); 676 } 677 678 // ObjC2 allows prefix attributes on class interfaces and protocols. 679 // FIXME: This still needs better diagnostics. We should only accept 680 // attributes here, no types, etc. 681 if (getLang().ObjC2 && Tok.is(tok::at)) { 682 SourceLocation AtLoc = ConsumeToken(); // the "@" 683 if (!Tok.isObjCAtKeyword(tok::objc_interface) && 684 !Tok.isObjCAtKeyword(tok::objc_protocol)) { 685 Diag(Tok, diag::err_objc_unexpected_attr); 686 SkipUntil(tok::semi); // FIXME: better skip? 687 return DeclGroupPtrTy(); 688 } 689 690 DS.abort(); 691 692 const char *PrevSpec = 0; 693 unsigned DiagID; 694 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID)) 695 Diag(AtLoc, DiagID) << PrevSpec; 696 697 Decl *TheDecl = 0; 698 if (Tok.isObjCAtKeyword(tok::objc_protocol)) 699 TheDecl = ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes()); 700 else 701 TheDecl = ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()); 702 return Actions.ConvertDeclToDeclGroup(TheDecl); 703 } 704 705 // If the declspec consisted only of 'extern' and we have a string 706 // literal following it, this must be a C++ linkage specifier like 707 // 'extern "C"'. 708 if (Tok.is(tok::string_literal) && getLang().CPlusPlus && 709 DS.getStorageClassSpec() == DeclSpec::SCS_extern && 710 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) { 711 Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext); 712 return Actions.ConvertDeclToDeclGroup(TheDecl); 713 } 714 715 return ParseDeclGroup(DS, Declarator::FileContext, true); 716} 717 718Parser::DeclGroupPtrTy 719Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributes &attrs, 720 AccessSpecifier AS) { 721 ParsingDeclSpec DS(*this); 722 DS.takeAttributesFrom(attrs); 723 return ParseDeclarationOrFunctionDefinition(DS, AS); 724} 725 726/// ParseFunctionDefinition - We parsed and verified that the specified 727/// Declarator is well formed. If this is a K&R-style function, read the 728/// parameters declaration-list, then start the compound-statement. 729/// 730/// function-definition: [C99 6.9.1] 731/// decl-specs declarator declaration-list[opt] compound-statement 732/// [C90] function-definition: [C99 6.7.1] - implicit int result 733/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement 734/// [C++] function-definition: [C++ 8.4] 735/// decl-specifier-seq[opt] declarator ctor-initializer[opt] 736/// function-body 737/// [C++] function-definition: [C++ 8.4] 738/// decl-specifier-seq[opt] declarator function-try-block 739/// 740Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D, 741 const ParsedTemplateInfo &TemplateInfo) { 742 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 743 744 // If this is C90 and the declspecs were completely missing, fudge in an 745 // implicit int. We do this here because this is the only place where 746 // declaration-specifiers are completely optional in the grammar. 747 if (getLang().ImplicitInt && D.getDeclSpec().isEmpty()) { 748 const char *PrevSpec; 749 unsigned DiagID; 750 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int, 751 D.getIdentifierLoc(), 752 PrevSpec, DiagID); 753 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin()); 754 } 755 756 // If this declaration was formed with a K&R-style identifier list for the 757 // arguments, parse declarations for all of the args next. 758 // int foo(a,b) int a; float b; {} 759 if (FTI.isKNRPrototype()) 760 ParseKNRParamDeclarations(D); 761 762 // We should have either an opening brace or, in a C++ constructor, 763 // we may have a colon. 764 if (Tok.isNot(tok::l_brace) && 765 (!getLang().CPlusPlus || 766 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try)))) { 767 Diag(Tok, diag::err_expected_fn_body); 768 769 // Skip over garbage, until we get to '{'. Don't eat the '{'. 770 SkipUntil(tok::l_brace, true, true); 771 772 // If we didn't find the '{', bail out. 773 if (Tok.isNot(tok::l_brace)) 774 return 0; 775 } 776 777 // Enter a scope for the function body. 778 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope); 779 780 // Tell the actions module that we have entered a function definition with the 781 // specified Declarator for the function. 782 Decl *Res = TemplateInfo.TemplateParams? 783 Actions.ActOnStartOfFunctionTemplateDef(getCurScope(), 784 MultiTemplateParamsArg(Actions, 785 TemplateInfo.TemplateParams->data(), 786 TemplateInfo.TemplateParams->size()), 787 D) 788 : Actions.ActOnStartOfFunctionDef(getCurScope(), D); 789 790 // Break out of the ParsingDeclarator context before we parse the body. 791 D.complete(Res); 792 793 // Break out of the ParsingDeclSpec context, too. This const_cast is 794 // safe because we're always the sole owner. 795 D.getMutableDeclSpec().abort(); 796 797 if (Tok.is(tok::kw_try)) 798 return ParseFunctionTryBlock(Res); 799 800 // If we have a colon, then we're probably parsing a C++ 801 // ctor-initializer. 802 if (Tok.is(tok::colon)) { 803 ParseConstructorInitializer(Res); 804 805 // Recover from error. 806 if (!Tok.is(tok::l_brace)) { 807 Actions.ActOnFinishFunctionBody(Res, 0); 808 return Res; 809 } 810 } else 811 Actions.ActOnDefaultCtorInitializers(Res); 812 813 return ParseFunctionStatementBody(Res); 814} 815 816/// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides 817/// types for a function with a K&R-style identifier list for arguments. 818void Parser::ParseKNRParamDeclarations(Declarator &D) { 819 // We know that the top-level of this declarator is a function. 820 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 821 822 // Enter function-declaration scope, limiting any declarators to the 823 // function prototype scope, including parameter declarators. 824 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope|Scope::DeclScope); 825 826 // Read all the argument declarations. 827 while (isDeclarationSpecifier()) { 828 SourceLocation DSStart = Tok.getLocation(); 829 830 // Parse the common declaration-specifiers piece. 831 DeclSpec DS; 832 ParseDeclarationSpecifiers(DS); 833 834 // C99 6.9.1p6: 'each declaration in the declaration list shall have at 835 // least one declarator'. 836 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with 837 // the declarations though. It's trivial to ignore them, really hard to do 838 // anything else with them. 839 if (Tok.is(tok::semi)) { 840 Diag(DSStart, diag::err_declaration_does_not_declare_param); 841 ConsumeToken(); 842 continue; 843 } 844 845 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other 846 // than register. 847 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 848 DS.getStorageClassSpec() != DeclSpec::SCS_register) { 849 Diag(DS.getStorageClassSpecLoc(), 850 diag::err_invalid_storage_class_in_func_decl); 851 DS.ClearStorageClassSpecs(); 852 } 853 if (DS.isThreadSpecified()) { 854 Diag(DS.getThreadSpecLoc(), 855 diag::err_invalid_storage_class_in_func_decl); 856 DS.ClearStorageClassSpecs(); 857 } 858 859 // Parse the first declarator attached to this declspec. 860 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext); 861 ParseDeclarator(ParmDeclarator); 862 863 // Handle the full declarator list. 864 while (1) { 865 // If attributes are present, parse them. 866 MaybeParseGNUAttributes(ParmDeclarator); 867 868 // Ask the actions module to compute the type for this declarator. 869 Decl *Param = 870 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator); 871 872 if (Param && 873 // A missing identifier has already been diagnosed. 874 ParmDeclarator.getIdentifier()) { 875 876 // Scan the argument list looking for the correct param to apply this 877 // type. 878 for (unsigned i = 0; ; ++i) { 879 // C99 6.9.1p6: those declarators shall declare only identifiers from 880 // the identifier list. 881 if (i == FTI.NumArgs) { 882 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param) 883 << ParmDeclarator.getIdentifier(); 884 break; 885 } 886 887 if (FTI.ArgInfo[i].Ident == ParmDeclarator.getIdentifier()) { 888 // Reject redefinitions of parameters. 889 if (FTI.ArgInfo[i].Param) { 890 Diag(ParmDeclarator.getIdentifierLoc(), 891 diag::err_param_redefinition) 892 << ParmDeclarator.getIdentifier(); 893 } else { 894 FTI.ArgInfo[i].Param = Param; 895 } 896 break; 897 } 898 } 899 } 900 901 // If we don't have a comma, it is either the end of the list (a ';') or 902 // an error, bail out. 903 if (Tok.isNot(tok::comma)) 904 break; 905 906 // Consume the comma. 907 ConsumeToken(); 908 909 // Parse the next declarator. 910 ParmDeclarator.clear(); 911 ParseDeclarator(ParmDeclarator); 912 } 913 914 if (Tok.is(tok::semi)) { 915 ConsumeToken(); 916 } else { 917 Diag(Tok, diag::err_parse_error); 918 // Skip to end of block or statement 919 SkipUntil(tok::semi, true); 920 if (Tok.is(tok::semi)) 921 ConsumeToken(); 922 } 923 } 924 925 // The actions module must verify that all arguments were declared. 926 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation()); 927} 928 929 930/// ParseAsmStringLiteral - This is just a normal string-literal, but is not 931/// allowed to be a wide string, and is not subject to character translation. 932/// 933/// [GNU] asm-string-literal: 934/// string-literal 935/// 936Parser::ExprResult Parser::ParseAsmStringLiteral() { 937 if (!isTokenStringLiteral()) { 938 Diag(Tok, diag::err_expected_string_literal); 939 return ExprError(); 940 } 941 942 ExprResult Res(ParseStringLiteralExpression()); 943 if (Res.isInvalid()) return move(Res); 944 945 // TODO: Diagnose: wide string literal in 'asm' 946 947 return move(Res); 948} 949 950/// ParseSimpleAsm 951/// 952/// [GNU] simple-asm-expr: 953/// 'asm' '(' asm-string-literal ')' 954/// 955Parser::ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) { 956 assert(Tok.is(tok::kw_asm) && "Not an asm!"); 957 SourceLocation Loc = ConsumeToken(); 958 959 if (Tok.is(tok::kw_volatile)) { 960 // Remove from the end of 'asm' to the end of 'volatile'. 961 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc), 962 PP.getLocForEndOfToken(Tok.getLocation())); 963 964 Diag(Tok, diag::warn_file_asm_volatile) 965 << FixItHint::CreateRemoval(RemovalRange); 966 ConsumeToken(); 967 } 968 969 if (Tok.isNot(tok::l_paren)) { 970 Diag(Tok, diag::err_expected_lparen_after) << "asm"; 971 return ExprError(); 972 } 973 974 Loc = ConsumeParen(); 975 976 ExprResult Result(ParseAsmStringLiteral()); 977 978 if (Result.isInvalid()) { 979 SkipUntil(tok::r_paren, true, true); 980 if (EndLoc) 981 *EndLoc = Tok.getLocation(); 982 ConsumeAnyToken(); 983 } else { 984 Loc = MatchRHSPunctuation(tok::r_paren, Loc); 985 if (EndLoc) 986 *EndLoc = Loc; 987 } 988 989 return move(Result); 990} 991 992/// TryAnnotateTypeOrScopeToken - If the current token position is on a 993/// typename (possibly qualified in C++) or a C++ scope specifier not followed 994/// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens 995/// with a single annotation token representing the typename or C++ scope 996/// respectively. 997/// This simplifies handling of C++ scope specifiers and allows efficient 998/// backtracking without the need to re-parse and resolve nested-names and 999/// typenames. 1000/// It will mainly be called when we expect to treat identifiers as typenames 1001/// (if they are typenames). For example, in C we do not expect identifiers 1002/// inside expressions to be treated as typenames so it will not be called 1003/// for expressions in C. 1004/// The benefit for C/ObjC is that a typename will be annotated and 1005/// Actions.getTypeName will not be needed to be called again (e.g. getTypeName 1006/// will not be called twice, once to check whether we have a declaration 1007/// specifier, and another one to get the actual type inside 1008/// ParseDeclarationSpecifiers). 1009/// 1010/// This returns true if an error occurred. 1011/// 1012/// Note that this routine emits an error if you call it with ::new or ::delete 1013/// as the current tokens, so only call it in contexts where these are invalid. 1014bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext) { 1015 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) 1016 || Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope)) && 1017 "Cannot be a type or scope token!"); 1018 1019 if (Tok.is(tok::kw_typename)) { 1020 // Parse a C++ typename-specifier, e.g., "typename T::type". 1021 // 1022 // typename-specifier: 1023 // 'typename' '::' [opt] nested-name-specifier identifier 1024 // 'typename' '::' [opt] nested-name-specifier template [opt] 1025 // simple-template-id 1026 SourceLocation TypenameLoc = ConsumeToken(); 1027 CXXScopeSpec SS; 1028 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/ParsedType(), false)) 1029 return true; 1030 if (!SS.isSet()) { 1031 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename); 1032 return true; 1033 } 1034 1035 TypeResult Ty; 1036 if (Tok.is(tok::identifier)) { 1037 // FIXME: check whether the next token is '<', first! 1038 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS, 1039 *Tok.getIdentifierInfo(), 1040 Tok.getLocation()); 1041 } else if (Tok.is(tok::annot_template_id)) { 1042 TemplateIdAnnotation *TemplateId 1043 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1044 if (TemplateId->Kind == TNK_Function_template) { 1045 Diag(Tok, diag::err_typename_refers_to_non_type_template) 1046 << Tok.getAnnotationRange(); 1047 return true; 1048 } 1049 1050 AnnotateTemplateIdTokenAsType(0); 1051 assert(Tok.is(tok::annot_typename) && 1052 "AnnotateTemplateIdTokenAsType isn't working properly"); 1053 if (Tok.getAnnotationValue()) 1054 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS, 1055 SourceLocation(), 1056 getTypeAnnotation(Tok)); 1057 else 1058 Ty = true; 1059 } else { 1060 Diag(Tok, diag::err_expected_type_name_after_typename) 1061 << SS.getRange(); 1062 return true; 1063 } 1064 1065 SourceLocation EndLoc = Tok.getLastLoc(); 1066 Tok.setKind(tok::annot_typename); 1067 setTypeAnnotation(Tok, Ty.isInvalid() ? ParsedType() : Ty.get()); 1068 Tok.setAnnotationEndLoc(EndLoc); 1069 Tok.setLocation(TypenameLoc); 1070 PP.AnnotateCachedTokens(Tok); 1071 return false; 1072 } 1073 1074 // Remembers whether the token was originally a scope annotation. 1075 bool wasScopeAnnotation = Tok.is(tok::annot_cxxscope); 1076 1077 CXXScopeSpec SS; 1078 if (getLang().CPlusPlus) 1079 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext)) 1080 return true; 1081 1082 if (Tok.is(tok::identifier)) { 1083 // Determine whether the identifier is a type name. 1084 if (ParsedType Ty = Actions.getTypeName(*Tok.getIdentifierInfo(), 1085 Tok.getLocation(), getCurScope(), 1086 &SS, false, 1087 NextToken().is(tok::period))) { 1088 // This is a typename. Replace the current token in-place with an 1089 // annotation type token. 1090 Tok.setKind(tok::annot_typename); 1091 setTypeAnnotation(Tok, Ty); 1092 Tok.setAnnotationEndLoc(Tok.getLocation()); 1093 if (SS.isNotEmpty()) // it was a C++ qualified type name. 1094 Tok.setLocation(SS.getBeginLoc()); 1095 1096 // In case the tokens were cached, have Preprocessor replace 1097 // them with the annotation token. 1098 PP.AnnotateCachedTokens(Tok); 1099 return false; 1100 } 1101 1102 if (!getLang().CPlusPlus) { 1103 // If we're in C, we can't have :: tokens at all (the lexer won't return 1104 // them). If the identifier is not a type, then it can't be scope either, 1105 // just early exit. 1106 return false; 1107 } 1108 1109 // If this is a template-id, annotate with a template-id or type token. 1110 if (NextToken().is(tok::less)) { 1111 TemplateTy Template; 1112 UnqualifiedId TemplateName; 1113 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation()); 1114 bool MemberOfUnknownSpecialization; 1115 if (TemplateNameKind TNK 1116 = Actions.isTemplateName(getCurScope(), SS, 1117 /*hasTemplateKeyword=*/false, TemplateName, 1118 /*ObjectType=*/ ParsedType(), 1119 EnteringContext, 1120 Template, MemberOfUnknownSpecialization)) { 1121 // Consume the identifier. 1122 ConsumeToken(); 1123 if (AnnotateTemplateIdToken(Template, TNK, &SS, TemplateName)) { 1124 // If an unrecoverable error occurred, we need to return true here, 1125 // because the token stream is in a damaged state. We may not return 1126 // a valid identifier. 1127 return true; 1128 } 1129 } 1130 } 1131 1132 // The current token, which is either an identifier or a 1133 // template-id, is not part of the annotation. Fall through to 1134 // push that token back into the stream and complete the C++ scope 1135 // specifier annotation. 1136 } 1137 1138 if (Tok.is(tok::annot_template_id)) { 1139 TemplateIdAnnotation *TemplateId 1140 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 1141 if (TemplateId->Kind == TNK_Type_template) { 1142 // A template-id that refers to a type was parsed into a 1143 // template-id annotation in a context where we weren't allowed 1144 // to produce a type annotation token. Update the template-id 1145 // annotation token to a type annotation token now. 1146 AnnotateTemplateIdTokenAsType(&SS); 1147 return false; 1148 } 1149 } 1150 1151 if (SS.isEmpty()) 1152 return false; 1153 1154 // A C++ scope specifier that isn't followed by a typename. 1155 // Push the current token back into the token stream (or revert it if it is 1156 // cached) and use an annotation scope token for current token. 1157 if (PP.isBacktrackEnabled()) 1158 PP.RevertCachedTokens(1); 1159 else 1160 PP.EnterToken(Tok); 1161 Tok.setKind(tok::annot_cxxscope); 1162 Tok.setAnnotationValue(SS.getScopeRep()); 1163 Tok.setAnnotationRange(SS.getRange()); 1164 1165 // In case the tokens were cached, have Preprocessor replace them 1166 // with the annotation token. We don't need to do this if we've 1167 // just reverted back to the state we were in before being called. 1168 if (!wasScopeAnnotation) 1169 PP.AnnotateCachedTokens(Tok); 1170 return false; 1171} 1172 1173/// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only 1174/// annotates C++ scope specifiers and template-ids. This returns 1175/// true if the token was annotated or there was an error that could not be 1176/// recovered from. 1177/// 1178/// Note that this routine emits an error if you call it with ::new or ::delete 1179/// as the current tokens, so only call it in contexts where these are invalid. 1180bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) { 1181 assert(getLang().CPlusPlus && 1182 "Call sites of this function should be guarded by checking for C++"); 1183 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) && 1184 "Cannot be a type or scope token!"); 1185 1186 CXXScopeSpec SS; 1187 if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext)) 1188 return true; 1189 if (SS.isEmpty()) 1190 return false; 1191 1192 // Push the current token back into the token stream (or revert it if it is 1193 // cached) and use an annotation scope token for current token. 1194 if (PP.isBacktrackEnabled()) 1195 PP.RevertCachedTokens(1); 1196 else 1197 PP.EnterToken(Tok); 1198 Tok.setKind(tok::annot_cxxscope); 1199 Tok.setAnnotationValue(SS.getScopeRep()); 1200 Tok.setAnnotationRange(SS.getRange()); 1201 1202 // In case the tokens were cached, have Preprocessor replace them with the 1203 // annotation token. 1204 PP.AnnotateCachedTokens(Tok); 1205 return false; 1206} 1207 1208bool Parser::isTokenEqualOrMistypedEqualEqual(unsigned DiagID) { 1209 if (Tok.is(tok::equalequal)) { 1210 // We have '==' in a context that we would expect a '='. 1211 // The user probably made a typo, intending to type '='. Emit diagnostic, 1212 // fixit hint to turn '==' -> '=' and continue as if the user typed '='. 1213 Diag(Tok, DiagID) 1214 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), 1215 getTokenSimpleSpelling(tok::equal)); 1216 return true; 1217 } 1218 1219 return Tok.is(tok::equal); 1220} 1221 1222void Parser::CodeCompletionRecovery() { 1223 for (Scope *S = getCurScope(); S; S = S->getParent()) { 1224 if (S->getFlags() & Scope::FnScope) { 1225 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_RecoveryInFunction); 1226 return; 1227 } 1228 1229 if (S->getFlags() & Scope::ClassScope) { 1230 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class); 1231 return; 1232 } 1233 } 1234 1235 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace); 1236} 1237 1238// Anchor the Parser::FieldCallback vtable to this translation unit. 1239// We use a spurious method instead of the destructor because 1240// destroying FieldCallbacks can actually be slightly 1241// performance-sensitive. 1242void Parser::FieldCallback::_anchor() { 1243} 1244 1245// Code-completion pass-through functions 1246 1247void Parser::CodeCompleteDirective(bool InConditional) { 1248 Actions.CodeCompletePreprocessorDirective(InConditional); 1249} 1250 1251void Parser::CodeCompleteInConditionalExclusion() { 1252 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope()); 1253} 1254 1255void Parser::CodeCompleteMacroName(bool IsDefinition) { 1256 Actions.CodeCompletePreprocessorMacroName(IsDefinition); 1257} 1258 1259void Parser::CodeCompletePreprocessorExpression() { 1260 Actions.CodeCompletePreprocessorExpression(); 1261} 1262 1263void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro, 1264 MacroInfo *MacroInfo, 1265 unsigned ArgumentIndex) { 1266 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo, 1267 ArgumentIndex); 1268} 1269 1270void Parser::CodeCompleteNaturalLanguage() { 1271 Actions.CodeCompleteNaturalLanguage(); 1272} 1273